From c88c129567a7a98918a3500cd678a1d0fceba11c Mon Sep 17 00:00:00 2001
From: Andrew Casey <amcasey@users.noreply.github.com>
Date: Fri, 11 May 2018 14:03:57 -0700
Subject: [PATCH 01/37] "gulp" -> "jake"

On branch `release-2.8`, `gulp` produces a build error.  In practice, `jake` is our supported build tool.
---
 README.md | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/README.md b/README.md
index 3200498b0cf..68b589efcce 100644
--- a/README.md
+++ b/README.md
@@ -61,29 +61,29 @@ Change to the TypeScript directory:
 cd TypeScript
 ```
 
-Install Gulp tools and dev dependencies:
+Install Jake tools and dev dependencies:
 
 ```bash
-npm install -g gulp
+npm install -g jake
 npm install
 ```
 
 Use one of the following to build and test:
 
 ```
-gulp local            # Build the compiler into built/local 
-gulp clean            # Delete the built compiler 
-gulp LKG              # Replace the last known good with the built one.
+jake local            # Build the compiler into built/local 
+jake clean            # Delete the built compiler 
+jake LKG              # Replace the last known good with the built one.
                       # Bootstrapping step to be executed when the built compiler reaches a stable state.
-gulp tests            # Build the test infrastructure using the built compiler. 
-gulp runtests         # Run tests using the built compiler and test infrastructure. 
+jake tests            # Build the test infrastructure using the built compiler. 
+jake runtests         # Run tests using the built compiler and test infrastructure. 
                       # You can override the host or specify a test for this command. 
                       # Use host=<hostName> or tests=<testPath>. 
-gulp runtests-browser # Runs the tests using the built run.js file. Syntax is gulp runtests. Optional
+jake runtests-browser # Runs the tests using the built run.js file. Syntax is jake runtests. Optional
                         parameters 'host=', 'tests=[regex], reporter=[list|spec|json|<more>]'.
-gulp baseline-accept  # This replaces the baseline test results with the results obtained from gulp runtests.
-gulp lint             # Runs tslint on the TypeScript source.
-gulp help             # List the above commands. 
+jake baseline-accept  # This replaces the baseline test results with the results obtained from jake runtests.
+jake lint             # Runs tslint on the TypeScript source.
+jake help             # List the above commands. 
 ```
 
 

From 5a69d9c2550a3bdc8f7b92b688388c5a5cce80d1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E7=8E=8B=E6=96=87=E7=92=90?= <kingwenlu@gmail.com>
Date: Mon, 16 Apr 2018 14:31:37 +0800
Subject: [PATCH 02/37] add support for add or remove braces to arrow function

---
 src/compiler/diagnosticMessages.json          | 12 +++
 src/harness/tsconfig.json                     |  1 +
 src/server/tsconfig.json                      |  1 +
 src/server/tsconfig.library.json              |  1 +
 .../refactors/convertArrowFunction.ts         | 90 +++++++++++++++++++
 src/services/tsconfig.json                    |  1 +
 .../refactorAddBracesToArrowFunction1.ts      | 11 +++
 .../refactorAddBracesToArrowFunction2.ts      | 11 +++
 .../refactorAddBracesToArrowFunction3.ts      | 11 +++
 .../refactorAddBracesToArrowFunction4.ts      | 11 +++
 .../refactorAddBracesToArrowFunction5.ts      | 11 +++
 .../refactorAddBracesToArrowFunction6.ts      | 11 +++
 .../refactorAddBracesToArrowFunction7.ts      |  6 ++
 .../refactorAddBracesToArrowFunction8.ts      |  9 ++
 14 files changed, 187 insertions(+)
 create mode 100644 src/services/refactors/convertArrowFunction.ts
 create mode 100644 tests/cases/fourslash/refactorAddBracesToArrowFunction1.ts
 create mode 100644 tests/cases/fourslash/refactorAddBracesToArrowFunction2.ts
 create mode 100644 tests/cases/fourslash/refactorAddBracesToArrowFunction3.ts
 create mode 100644 tests/cases/fourslash/refactorAddBracesToArrowFunction4.ts
 create mode 100644 tests/cases/fourslash/refactorAddBracesToArrowFunction5.ts
 create mode 100644 tests/cases/fourslash/refactorAddBracesToArrowFunction6.ts
 create mode 100644 tests/cases/fourslash/refactorAddBracesToArrowFunction7.ts
 create mode 100644 tests/cases/fourslash/refactorAddBracesToArrowFunction8.ts

diff --git a/src/compiler/diagnosticMessages.json b/src/compiler/diagnosticMessages.json
index 59007e610b4..6660b29fd65 100644
--- a/src/compiler/diagnosticMessages.json
+++ b/src/compiler/diagnosticMessages.json
@@ -4280,5 +4280,17 @@
     "Remove all unused labels": {
         "category": "Message",
         "code": 95054
+    },
+    "Convert arrow function": {
+        "category": "Message",
+        "code": 95055
+    },
+    "Add braces to arrow function": {
+        "category": "Message",
+        "code": 95056
+    },
+    "Remove braces from arrow function": {
+        "category": "Message",
+        "code": 95057
     }
 }
diff --git a/src/harness/tsconfig.json b/src/harness/tsconfig.json
index 359701a02cb..4749520822e 100644
--- a/src/harness/tsconfig.json
+++ b/src/harness/tsconfig.json
@@ -121,6 +121,7 @@
         "../services/refactors/extractSymbol.ts",
         "../services/refactors/generateGetAccessorAndSetAccessor.ts",
         "../services/refactors/moveToNewFile.ts",
+        "../services/refactors/convertArrowFunction.ts",
         "../services/sourcemaps.ts",
         "../services/services.ts",
         "../services/breakpoints.ts",
diff --git a/src/server/tsconfig.json b/src/server/tsconfig.json
index 8ae6974baf0..7d81e068648 100644
--- a/src/server/tsconfig.json
+++ b/src/server/tsconfig.json
@@ -117,6 +117,7 @@
         "../services/refactors/extractSymbol.ts",
         "../services/refactors/generateGetAccessorAndSetAccessor.ts",
         "../services/refactors/moveToNewFile.ts",
+        "../services/refactors/convertArrowFunction.ts",
         "../services/sourcemaps.ts",
         "../services/services.ts",
         "../services/breakpoints.ts",
diff --git a/src/server/tsconfig.library.json b/src/server/tsconfig.library.json
index 922af11e879..df72b37e530 100644
--- a/src/server/tsconfig.library.json
+++ b/src/server/tsconfig.library.json
@@ -123,6 +123,7 @@
         "../services/refactors/extractSymbol.ts",
         "../services/refactors/generateGetAccessorAndSetAccessor.ts",
         "../services/refactors/moveToNewFile.ts",
+        "../services/refactors/convertArrowFunction.ts",
         "../services/sourcemaps.ts",
         "../services/services.ts",
         "../services/breakpoints.ts",
diff --git a/src/services/refactors/convertArrowFunction.ts b/src/services/refactors/convertArrowFunction.ts
new file mode 100644
index 00000000000..af1d232ad3e
--- /dev/null
+++ b/src/services/refactors/convertArrowFunction.ts
@@ -0,0 +1,90 @@
+/* @internal */
+namespace ts.refactor.convertArrowFunction {
+    const refactorName = "Convert arrow function";
+    const refactorDescription = Diagnostics.Convert_arrow_function.message;
+    const addBracesActionName = "Add braces to arrow function";
+    const removeBracesActionName = "Remove braces from arrow function";
+    const addBracesActionDescription = Diagnostics.Add_braces_to_arrow_function.message;
+    const removeBracesActionDescription = Diagnostics.Remove_braces_from_arrow_function.message;
+    registerRefactor(refactorName, { getEditsForAction, getAvailableActions });
+
+    interface Info {
+        container: ArrowFunction;
+        expression: Expression;
+        addBraces: boolean;
+    }
+
+    function getAvailableActions(context: RefactorContext): ApplicableRefactorInfo[] | undefined {
+        const { file, startPosition } = context;
+        const info = getConvertibleArrowFunctionAtPosition(file, startPosition);
+        if (!info) return undefined;
+
+        const actions: RefactorActionInfo[] = [
+            info.addBraces ?
+                {
+                    name: addBracesActionName,
+                    description: addBracesActionDescription
+                } : {
+                    name: removeBracesActionName,
+                    description: removeBracesActionDescription
+                }
+        ];
+
+        return [{
+            name: refactorName,
+            description: refactorDescription,
+            actions
+        }];
+    }
+
+    function getEditsForAction(context: RefactorContext, _actionName: string): RefactorEditInfo | undefined {
+        const { file, startPosition } = context;
+        const info = getConvertibleArrowFunctionAtPosition(file, startPosition);
+        if (!info) return undefined;
+
+        const { addBraces, expression, container } = info;
+        const changeTracker = textChanges.ChangeTracker.fromContext(context);
+        updateBraces(changeTracker, file, container, expression, addBraces);
+
+        return {
+            renameFilename: undefined,
+            renameLocation: undefined,
+            edits: changeTracker.getChanges()
+        };
+    }
+
+    function updateBraces(changeTracker: textChanges.ChangeTracker, file: SourceFile, container: ArrowFunction, expression: Expression, addBraces: boolean) {
+        const body = addBraces ? createBlock([createReturn(expression)]) : expression;
+
+        const arrowFunction = updateArrowFunction(
+            container,
+            container.modifiers,
+            container.typeParameters,
+            container.parameters,
+            container.type,
+            body);
+        changeTracker.replaceNode(file, container, arrowFunction);
+    }
+
+    function getConvertibleArrowFunctionAtPosition(file: SourceFile, startPosition: number): Info | undefined {
+        const node = getTokenAtPosition(file, startPosition, /*includeJsDocComment*/ false);
+        const container = getContainingFunction(node);
+        if (!container || !isArrowFunction(container)) return undefined;
+
+        if (isExpression(container.body)) {
+            return {
+                container,
+                addBraces: true,
+                expression: container.body
+            };
+        }
+        else if (container.body.statements.length === 1 && isReturnStatement(first(container.body.statements))) {
+            return {
+                container,
+                addBraces: false,
+                expression: (<ReturnStatement>first(container.body.statements)).expression
+            };
+        }
+        return undefined;
+    }
+}
diff --git a/src/services/tsconfig.json b/src/services/tsconfig.json
index 7e1ccc9c3af..f425c569e31 100644
--- a/src/services/tsconfig.json
+++ b/src/services/tsconfig.json
@@ -114,6 +114,7 @@
         "refactors/extractSymbol.ts",
         "refactors/generateGetAccessorAndSetAccessor.ts",
         "refactors/moveToNewFile.ts",
+        "refactors/convertArrowFunction.ts",
         "sourcemaps.ts",
         "services.ts",
         "breakpoints.ts",
diff --git a/tests/cases/fourslash/refactorAddBracesToArrowFunction1.ts b/tests/cases/fourslash/refactorAddBracesToArrowFunction1.ts
new file mode 100644
index 00000000000..fde5a54656e
--- /dev/null
+++ b/tests/cases/fourslash/refactorAddBracesToArrowFunction1.ts
@@ -0,0 +1,11 @@
+/// <reference path='fourslash.ts' />
+
+//// const foo = /*a*/a/*b*/ => a + 1;
+
+goTo.select("a", "b");
+edit.applyRefactor({
+    refactorName: "Convert arrow function",
+    actionName: "Add braces to arrow function",
+    actionDescription: "Add braces to arrow function",
+    newContent: `const foo = a => { return a + 1; };`,
+});
diff --git a/tests/cases/fourslash/refactorAddBracesToArrowFunction2.ts b/tests/cases/fourslash/refactorAddBracesToArrowFunction2.ts
new file mode 100644
index 00000000000..30f4de0e9a7
--- /dev/null
+++ b/tests/cases/fourslash/refactorAddBracesToArrowFunction2.ts
@@ -0,0 +1,11 @@
+/// <reference path='fourslash.ts' />
+
+//// const foo = /*a*/a/*b*/ => ({ a: 1 });
+
+goTo.select("a", "b");
+edit.applyRefactor({
+    refactorName: "Convert arrow function",
+    actionName: "Add braces to arrow function",
+    actionDescription: "Add braces to arrow function",
+    newContent: `const foo = a => { return ({ a: 1 }); };`,
+});
diff --git a/tests/cases/fourslash/refactorAddBracesToArrowFunction3.ts b/tests/cases/fourslash/refactorAddBracesToArrowFunction3.ts
new file mode 100644
index 00000000000..cd2d773449e
--- /dev/null
+++ b/tests/cases/fourslash/refactorAddBracesToArrowFunction3.ts
@@ -0,0 +1,11 @@
+/// <reference path='fourslash.ts' />
+
+//// const foo = /*a*/a/*b*/ => 1;
+
+goTo.select("a", "b");
+edit.applyRefactor({
+    refactorName: "Convert arrow function",
+    actionName: "Add braces to arrow function",
+    actionDescription: "Add braces to arrow function",
+    newContent: `const foo = a => { return 1; };`,
+});
diff --git a/tests/cases/fourslash/refactorAddBracesToArrowFunction4.ts b/tests/cases/fourslash/refactorAddBracesToArrowFunction4.ts
new file mode 100644
index 00000000000..f113d63add4
--- /dev/null
+++ b/tests/cases/fourslash/refactorAddBracesToArrowFunction4.ts
@@ -0,0 +1,11 @@
+/// <reference path='fourslash.ts' />
+
+//// const foo = /*a*/a/*b*/ => { return a + 1; };
+
+goTo.select("a", "b");
+edit.applyRefactor({
+    refactorName: "Convert arrow function",
+    actionName: "Remove braces from arrow function",
+    actionDescription: "Remove braces from arrow function",
+    newContent: `const foo = a => a + 1;`,
+});
diff --git a/tests/cases/fourslash/refactorAddBracesToArrowFunction5.ts b/tests/cases/fourslash/refactorAddBracesToArrowFunction5.ts
new file mode 100644
index 00000000000..bc0cdfd6484
--- /dev/null
+++ b/tests/cases/fourslash/refactorAddBracesToArrowFunction5.ts
@@ -0,0 +1,11 @@
+/// <reference path='fourslash.ts' />
+
+//// const foo = /*a*/a/*b*/ => { return { a: 1 }; };
+
+goTo.select("a", "b");
+edit.applyRefactor({
+    refactorName: "Convert arrow function",
+    actionName: "Remove braces from arrow function",
+    actionDescription: "Remove braces from arrow function",
+    newContent: `const foo = a => ({ a: 1 });`,
+});
diff --git a/tests/cases/fourslash/refactorAddBracesToArrowFunction6.ts b/tests/cases/fourslash/refactorAddBracesToArrowFunction6.ts
new file mode 100644
index 00000000000..999fba05193
--- /dev/null
+++ b/tests/cases/fourslash/refactorAddBracesToArrowFunction6.ts
@@ -0,0 +1,11 @@
+/// <reference path='fourslash.ts' />
+
+//// const foo = /*a*/a/*b*/ => { return 1; };
+
+goTo.select("a", "b");
+edit.applyRefactor({
+    refactorName: "Convert arrow function",
+    actionName: "Remove braces from arrow function",
+    actionDescription: "Remove braces from arrow function",
+    newContent: `const foo = a => 1;`,
+});
diff --git a/tests/cases/fourslash/refactorAddBracesToArrowFunction7.ts b/tests/cases/fourslash/refactorAddBracesToArrowFunction7.ts
new file mode 100644
index 00000000000..7f7a5207515
--- /dev/null
+++ b/tests/cases/fourslash/refactorAddBracesToArrowFunction7.ts
@@ -0,0 +1,6 @@
+/// <reference path='fourslash.ts' />
+
+//// const foo = /*a*/a/*b*/ => {  };
+
+goTo.select("a", "b");
+verify.not.refactorAvailable("Convert arrow function");
diff --git a/tests/cases/fourslash/refactorAddBracesToArrowFunction8.ts b/tests/cases/fourslash/refactorAddBracesToArrowFunction8.ts
new file mode 100644
index 00000000000..1c7f0bd954b
--- /dev/null
+++ b/tests/cases/fourslash/refactorAddBracesToArrowFunction8.ts
@@ -0,0 +1,9 @@
+/// <reference path='fourslash.ts' />
+
+//// const foo = /*a*/a/*b*/ => {
+////     const b = 1;
+////     return a + b;
+//// };
+
+goTo.select("a", "b");
+verify.not.refactorAvailable("Convert arrow function");

From 32be0c70993dbf36de3cb6166f3ed724c345fa4e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E7=8E=8B=E6=96=87=E7=92=90?= <kingwenlu@gmail.com>
Date: Tue, 17 Apr 2018 10:33:21 +0800
Subject: [PATCH 03/37] add tests and fix

---
 src/compiler/diagnosticMessages.json          |  2 +-
 src/harness/tsconfig.json                     |  2 +-
 src/server/tsconfig.json                      |  2 +-
 src/server/tsconfig.library.json              |  2 +-
 ...ts => addOrRemoveBracesToArrowFunction.ts} | 69 ++++++++++++-------
 src/services/tsconfig.json                    |  2 +-
 .../refactorAddBracesToArrowFunction7.ts      |  6 --
 ...actorAddOrRemoveBracesToArrowFunction1.ts} |  2 +-
 ...actorAddOrRemoveBracesToArrowFunction10.ts | 11 +++
 ...actorAddOrRemoveBracesToArrowFunction11.ts | 11 +++
 ...actorAddOrRemoveBracesToArrowFunction12.ts | 11 +++
 ...actorAddOrRemoveBracesToArrowFunction13.ts | 11 +++
 ...actorAddOrRemoveBracesToArrowFunction14.ts | 11 +++
 ...actorAddOrRemoveBracesToArrowFunction15.ts | 11 +++
 ...actorAddOrRemoveBracesToArrowFunction16.ts | 11 +++
 ...actorAddOrRemoveBracesToArrowFunction17.ts | 11 +++
 ...actorAddOrRemoveBracesToArrowFunction18.ts | 11 +++
 ...actorAddOrRemoveBracesToArrowFunction19.ts | 11 +++
 ...actorAddOrRemoveBracesToArrowFunction2.ts} |  2 +-
 ...actorAddOrRemoveBracesToArrowFunction3.ts} |  2 +-
 ...actorAddOrRemoveBracesToArrowFunction4.ts} |  4 +-
 ...actorAddOrRemoveBracesToArrowFunction5.ts} |  2 +-
 ...actorAddOrRemoveBracesToArrowFunction6.ts} |  2 +-
 ...actorAddOrRemoveBracesToArrowFunction8.ts} |  2 +-
 ...factorAddOrRemoveBracesToArrowFunction9.ts | 11 +++
 25 files changed, 178 insertions(+), 44 deletions(-)
 rename src/services/refactors/{convertArrowFunction.ts => addOrRemoveBracesToArrowFunction.ts} (53%)
 delete mode 100644 tests/cases/fourslash/refactorAddBracesToArrowFunction7.ts
 rename tests/cases/fourslash/{refactorAddBracesToArrowFunction1.ts => refactorAddOrRemoveBracesToArrowFunction1.ts} (81%)
 create mode 100644 tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction10.ts
 create mode 100644 tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction11.ts
 create mode 100644 tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction12.ts
 create mode 100644 tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction13.ts
 create mode 100644 tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction14.ts
 create mode 100644 tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction15.ts
 create mode 100644 tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction16.ts
 create mode 100644 tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction17.ts
 create mode 100644 tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction18.ts
 create mode 100644 tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction19.ts
 rename tests/cases/fourslash/{refactorAddBracesToArrowFunction2.ts => refactorAddOrRemoveBracesToArrowFunction2.ts} (82%)
 rename tests/cases/fourslash/{refactorAddBracesToArrowFunction3.ts => refactorAddOrRemoveBracesToArrowFunction3.ts} (81%)
 rename tests/cases/fourslash/{refactorAddBracesToArrowFunction4.ts => refactorAddOrRemoveBracesToArrowFunction4.ts} (70%)
 rename tests/cases/fourslash/{refactorAddBracesToArrowFunction5.ts => refactorAddOrRemoveBracesToArrowFunction5.ts} (82%)
 rename tests/cases/fourslash/{refactorAddBracesToArrowFunction6.ts => refactorAddOrRemoveBracesToArrowFunction6.ts} (82%)
 rename tests/cases/fourslash/{refactorAddBracesToArrowFunction8.ts => refactorAddOrRemoveBracesToArrowFunction8.ts} (66%)
 create mode 100644 tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction9.ts

diff --git a/src/compiler/diagnosticMessages.json b/src/compiler/diagnosticMessages.json
index 6660b29fd65..b5cb450bfec 100644
--- a/src/compiler/diagnosticMessages.json
+++ b/src/compiler/diagnosticMessages.json
@@ -4281,7 +4281,7 @@
         "category": "Message",
         "code": 95054
     },
-    "Convert arrow function": {
+    "Add or remove braces in an arrow function": {
         "category": "Message",
         "code": 95055
     },
diff --git a/src/harness/tsconfig.json b/src/harness/tsconfig.json
index 4749520822e..22b7f496704 100644
--- a/src/harness/tsconfig.json
+++ b/src/harness/tsconfig.json
@@ -121,7 +121,7 @@
         "../services/refactors/extractSymbol.ts",
         "../services/refactors/generateGetAccessorAndSetAccessor.ts",
         "../services/refactors/moveToNewFile.ts",
-        "../services/refactors/convertArrowFunction.ts",
+        "../services/refactors/addOrRemoveBracesToArrowFunction.ts",
         "../services/sourcemaps.ts",
         "../services/services.ts",
         "../services/breakpoints.ts",
diff --git a/src/server/tsconfig.json b/src/server/tsconfig.json
index 7d81e068648..6c5144093ae 100644
--- a/src/server/tsconfig.json
+++ b/src/server/tsconfig.json
@@ -117,7 +117,7 @@
         "../services/refactors/extractSymbol.ts",
         "../services/refactors/generateGetAccessorAndSetAccessor.ts",
         "../services/refactors/moveToNewFile.ts",
-        "../services/refactors/convertArrowFunction.ts",
+        "../services/refactors/addOrRemoveBracesToArrowFunction.ts",
         "../services/sourcemaps.ts",
         "../services/services.ts",
         "../services/breakpoints.ts",
diff --git a/src/server/tsconfig.library.json b/src/server/tsconfig.library.json
index df72b37e530..59ff8cc9e83 100644
--- a/src/server/tsconfig.library.json
+++ b/src/server/tsconfig.library.json
@@ -123,7 +123,7 @@
         "../services/refactors/extractSymbol.ts",
         "../services/refactors/generateGetAccessorAndSetAccessor.ts",
         "../services/refactors/moveToNewFile.ts",
-        "../services/refactors/convertArrowFunction.ts",
+        "../services/refactors/addOrRemoveBracesToArrowFunction.ts",
         "../services/sourcemaps.ts",
         "../services/services.ts",
         "../services/breakpoints.ts",
diff --git a/src/services/refactors/convertArrowFunction.ts b/src/services/refactors/addOrRemoveBracesToArrowFunction.ts
similarity index 53%
rename from src/services/refactors/convertArrowFunction.ts
rename to src/services/refactors/addOrRemoveBracesToArrowFunction.ts
index af1d232ad3e..df7cacadf3f 100644
--- a/src/services/refactors/convertArrowFunction.ts
+++ b/src/services/refactors/addOrRemoveBracesToArrowFunction.ts
@@ -1,7 +1,7 @@
 /* @internal */
-namespace ts.refactor.convertArrowFunction {
-    const refactorName = "Convert arrow function";
-    const refactorDescription = Diagnostics.Convert_arrow_function.message;
+namespace ts.refactor.addOrRemoveBracesToArrowFunction {
+    const refactorName = "Add or remove braces in an arrow function";
+    const refactorDescription = Diagnostics.Add_or_remove_braces_in_an_arrow_function.message;
     const addBracesActionName = "Add braces to arrow function";
     const removeBracesActionName = "Remove braces from arrow function";
     const addBracesActionDescription = Diagnostics.Add_braces_to_arrow_function.message;
@@ -19,21 +19,19 @@ namespace ts.refactor.convertArrowFunction {
         const info = getConvertibleArrowFunctionAtPosition(file, startPosition);
         if (!info) return undefined;
 
-        const actions: RefactorActionInfo[] = [
-            info.addBraces ?
-                {
-                    name: addBracesActionName,
-                    description: addBracesActionDescription
-                } : {
-                    name: removeBracesActionName,
-                    description: removeBracesActionDescription
-                }
-        ];
-
         return [{
             name: refactorName,
             description: refactorDescription,
-            actions
+            actions: [
+                info.addBraces ?
+                    {
+                        name: addBracesActionName,
+                        description: addBracesActionDescription
+                    } : {
+                        name: removeBracesActionName,
+                        description: removeBracesActionDescription
+                    }
+            ]
         }];
     }
 
@@ -42,9 +40,18 @@ namespace ts.refactor.convertArrowFunction {
         const info = getConvertibleArrowFunctionAtPosition(file, startPosition);
         if (!info) return undefined;
 
-        const { addBraces, expression, container } = info;
+        const { expression, container } = info;
         const changeTracker = textChanges.ChangeTracker.fromContext(context);
-        updateBraces(changeTracker, file, container, expression, addBraces);
+
+        if (_actionName === addBracesActionName) {
+            addBraces(changeTracker, file, container, expression);
+        }
+        else if (_actionName === removeBracesActionName) {
+            removeBraces(changeTracker, file, container, expression);
+        }
+        else {
+            Debug.fail("invalid action");
+        }
 
         return {
             renameFilename: undefined,
@@ -53,9 +60,18 @@ namespace ts.refactor.convertArrowFunction {
         };
     }
 
-    function updateBraces(changeTracker: textChanges.ChangeTracker, file: SourceFile, container: ArrowFunction, expression: Expression, addBraces: boolean) {
-        const body = addBraces ? createBlock([createReturn(expression)]) : expression;
+    function addBraces(changeTracker: textChanges.ChangeTracker, file: SourceFile, container: ArrowFunction, expression: Expression) {
+        updateBraces(changeTracker, file, container, createBlock([createReturn(expression)]));
+    }
 
+    function removeBraces(changeTracker: textChanges.ChangeTracker, file: SourceFile, container: ArrowFunction, expression: Expression) {
+        if (!isLiteralExpression(expression) && !isIdentifier(expression) && !isParenthesizedExpression(expression) && expression.kind !== SyntaxKind.NullKeyword) {
+            expression = createParen(expression);
+        }
+        updateBraces(changeTracker, file, container, expression);
+    }
+
+    function updateBraces(changeTracker: textChanges.ChangeTracker, file: SourceFile, container: ArrowFunction, body: ConciseBody) {
         const arrowFunction = updateArrowFunction(
             container,
             container.modifiers,
@@ -78,12 +94,15 @@ namespace ts.refactor.convertArrowFunction {
                 expression: container.body
             };
         }
-        else if (container.body.statements.length === 1 && isReturnStatement(first(container.body.statements))) {
-            return {
-                container,
-                addBraces: false,
-                expression: (<ReturnStatement>first(container.body.statements)).expression
-            };
+        else if (container.body.statements.length === 1) {
+            const firstStatement = first(container.body.statements);
+            if (isReturnStatement(firstStatement)) {
+                return {
+                    container,
+                    addBraces: false,
+                    expression: firstStatement.expression
+                };
+            }
         }
         return undefined;
     }
diff --git a/src/services/tsconfig.json b/src/services/tsconfig.json
index f425c569e31..4d94facef35 100644
--- a/src/services/tsconfig.json
+++ b/src/services/tsconfig.json
@@ -114,7 +114,7 @@
         "refactors/extractSymbol.ts",
         "refactors/generateGetAccessorAndSetAccessor.ts",
         "refactors/moveToNewFile.ts",
-        "refactors/convertArrowFunction.ts",
+        "refactors/addOrRemoveBracesToArrowFunction.ts",
         "sourcemaps.ts",
         "services.ts",
         "breakpoints.ts",
diff --git a/tests/cases/fourslash/refactorAddBracesToArrowFunction7.ts b/tests/cases/fourslash/refactorAddBracesToArrowFunction7.ts
deleted file mode 100644
index 7f7a5207515..00000000000
--- a/tests/cases/fourslash/refactorAddBracesToArrowFunction7.ts
+++ /dev/null
@@ -1,6 +0,0 @@
-/// <reference path='fourslash.ts' />
-
-//// const foo = /*a*/a/*b*/ => {  };
-
-goTo.select("a", "b");
-verify.not.refactorAvailable("Convert arrow function");
diff --git a/tests/cases/fourslash/refactorAddBracesToArrowFunction1.ts b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction1.ts
similarity index 81%
rename from tests/cases/fourslash/refactorAddBracesToArrowFunction1.ts
rename to tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction1.ts
index fde5a54656e..1d8d52e201f 100644
--- a/tests/cases/fourslash/refactorAddBracesToArrowFunction1.ts
+++ b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction1.ts
@@ -4,7 +4,7 @@
 
 goTo.select("a", "b");
 edit.applyRefactor({
-    refactorName: "Convert arrow function",
+    refactorName: "Add or remove braces in an arrow function",
     actionName: "Add braces to arrow function",
     actionDescription: "Add braces to arrow function",
     newContent: `const foo = a => { return a + 1; };`,
diff --git a/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction10.ts b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction10.ts
new file mode 100644
index 00000000000..373172a2b31
--- /dev/null
+++ b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction10.ts
@@ -0,0 +1,11 @@
+/// <reference path='fourslash.ts' />
+
+//// const foo = /*a*/a/*b*/ => { return (1, 2, 3); };
+
+goTo.select("a", "b");
+edit.applyRefactor({
+    refactorName: "Add or remove braces in an arrow function",
+    actionName: "Remove braces from arrow function",
+    actionDescription: "Remove braces from arrow function",
+    newContent: `const foo = a => (1, 2, 3);`,
+});
diff --git a/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction11.ts b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction11.ts
new file mode 100644
index 00000000000..c634db625cf
--- /dev/null
+++ b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction11.ts
@@ -0,0 +1,11 @@
+/// <reference path='fourslash.ts' />
+
+//// const foo = /*a*/a/*b*/ => { return 1, 2, 3; };
+
+goTo.select("a", "b");
+edit.applyRefactor({
+    refactorName: "Add or remove braces in an arrow function",
+    actionName: "Remove braces from arrow function",
+    actionDescription: "Remove braces from arrow function",
+    newContent: `const foo = a => (1, 2, 3);`,
+});
diff --git a/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction12.ts b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction12.ts
new file mode 100644
index 00000000000..aecf37c8b56
--- /dev/null
+++ b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction12.ts
@@ -0,0 +1,11 @@
+/// <reference path='fourslash.ts' />
+
+//// const foo = /*a*/a/*b*/ => { return "foo"; };
+
+goTo.select("a", "b");
+edit.applyRefactor({
+    refactorName: "Add or remove braces in an arrow function",
+    actionName: "Remove braces from arrow function",
+    actionDescription: "Remove braces from arrow function",
+    newContent: `const foo = a => "foo";`,
+});
diff --git a/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction13.ts b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction13.ts
new file mode 100644
index 00000000000..64d1a02db67
--- /dev/null
+++ b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction13.ts
@@ -0,0 +1,11 @@
+/// <reference path='fourslash.ts' />
+
+//// const foo = /*a*/a/*b*/ => { return null; };
+
+goTo.select("a", "b");
+edit.applyRefactor({
+    refactorName: "Add or remove braces in an arrow function",
+    actionName: "Remove braces from arrow function",
+    actionDescription: "Remove braces from arrow function",
+    newContent: `const foo = a => null;`,
+});
diff --git a/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction14.ts b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction14.ts
new file mode 100644
index 00000000000..b15f1cfad31
--- /dev/null
+++ b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction14.ts
@@ -0,0 +1,11 @@
+/// <reference path='fourslash.ts' />
+
+//// const foo = /*a*/a/*b*/ => { return undefined; };
+
+goTo.select("a", "b");
+edit.applyRefactor({
+    refactorName: "Add or remove braces in an arrow function",
+    actionName: "Remove braces from arrow function",
+    actionDescription: "Remove braces from arrow function",
+    newContent: `const foo = a => undefined;`,
+});
diff --git a/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction15.ts b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction15.ts
new file mode 100644
index 00000000000..af2927f8f94
--- /dev/null
+++ b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction15.ts
@@ -0,0 +1,11 @@
+/// <reference path='fourslash.ts' />
+
+//// const foo = /*a*/a/*b*/ => { return void 0; };
+
+goTo.select("a", "b");
+edit.applyRefactor({
+    refactorName: "Add or remove braces in an arrow function",
+    actionName: "Remove braces from arrow function",
+    actionDescription: "Remove braces from arrow function",
+    newContent: `const foo = a => (void 0);`,
+});
diff --git a/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction16.ts b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction16.ts
new file mode 100644
index 00000000000..87bdcfe5752
--- /dev/null
+++ b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction16.ts
@@ -0,0 +1,11 @@
+/// <reference path='fourslash.ts' />
+
+//// const foo = /*a*/a/*b*/ => { return {}; };
+
+goTo.select("a", "b");
+edit.applyRefactor({
+    refactorName: "Add or remove braces in an arrow function",
+    actionName: "Remove braces from arrow function",
+    actionDescription: "Remove braces from arrow function",
+    newContent: `const foo = a => ({});`,
+});
diff --git a/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction17.ts b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction17.ts
new file mode 100644
index 00000000000..e71809ac38f
--- /dev/null
+++ b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction17.ts
@@ -0,0 +1,11 @@
+/// <reference path='fourslash.ts' />
+
+//// const foo = /*a*/a/*b*/ => { return `abc{a}`; };
+
+goTo.select("a", "b");
+edit.applyRefactor({
+    refactorName: "Add or remove braces in an arrow function",
+    actionName: "Remove braces from arrow function",
+    actionDescription: "Remove braces from arrow function",
+    newContent: `const foo = a => \`abc{a}\`;`,
+});
diff --git a/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction18.ts b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction18.ts
new file mode 100644
index 00000000000..0e2d85ddd26
--- /dev/null
+++ b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction18.ts
@@ -0,0 +1,11 @@
+/// <reference path='fourslash.ts' />
+
+//// const foo = /*a*/a/*b*/ => { return `abc`; };
+
+goTo.select("a", "b");
+edit.applyRefactor({
+    refactorName: "Add or remove braces in an arrow function",
+    actionName: "Remove braces from arrow function",
+    actionDescription: "Remove braces from arrow function",
+    newContent: `const foo = a => \`abc\`;`,
+});
diff --git a/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction19.ts b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction19.ts
new file mode 100644
index 00000000000..9d56a4d5f66
--- /dev/null
+++ b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction19.ts
@@ -0,0 +1,11 @@
+/// <reference path='fourslash.ts' />
+
+//// const foo = /*a*/a/*b*/ => { return a; };
+
+goTo.select("a", "b");
+edit.applyRefactor({
+    refactorName: "Add or remove braces in an arrow function",
+    actionName: "Remove braces from arrow function",
+    actionDescription: "Remove braces from arrow function",
+    newContent: `const foo = a => a;`,
+});
diff --git a/tests/cases/fourslash/refactorAddBracesToArrowFunction2.ts b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction2.ts
similarity index 82%
rename from tests/cases/fourslash/refactorAddBracesToArrowFunction2.ts
rename to tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction2.ts
index 30f4de0e9a7..d875018c397 100644
--- a/tests/cases/fourslash/refactorAddBracesToArrowFunction2.ts
+++ b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction2.ts
@@ -4,7 +4,7 @@
 
 goTo.select("a", "b");
 edit.applyRefactor({
-    refactorName: "Convert arrow function",
+    refactorName: "Add or remove braces in an arrow function",
     actionName: "Add braces to arrow function",
     actionDescription: "Add braces to arrow function",
     newContent: `const foo = a => { return ({ a: 1 }); };`,
diff --git a/tests/cases/fourslash/refactorAddBracesToArrowFunction3.ts b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction3.ts
similarity index 81%
rename from tests/cases/fourslash/refactorAddBracesToArrowFunction3.ts
rename to tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction3.ts
index cd2d773449e..ead5867a175 100644
--- a/tests/cases/fourslash/refactorAddBracesToArrowFunction3.ts
+++ b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction3.ts
@@ -4,7 +4,7 @@
 
 goTo.select("a", "b");
 edit.applyRefactor({
-    refactorName: "Convert arrow function",
+    refactorName: "Add or remove braces in an arrow function",
     actionName: "Add braces to arrow function",
     actionDescription: "Add braces to arrow function",
     newContent: `const foo = a => { return 1; };`,
diff --git a/tests/cases/fourslash/refactorAddBracesToArrowFunction4.ts b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction4.ts
similarity index 70%
rename from tests/cases/fourslash/refactorAddBracesToArrowFunction4.ts
rename to tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction4.ts
index f113d63add4..a2147af1d47 100644
--- a/tests/cases/fourslash/refactorAddBracesToArrowFunction4.ts
+++ b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction4.ts
@@ -4,8 +4,8 @@
 
 goTo.select("a", "b");
 edit.applyRefactor({
-    refactorName: "Convert arrow function",
+    refactorName: "Add or remove braces in an arrow function",
     actionName: "Remove braces from arrow function",
     actionDescription: "Remove braces from arrow function",
-    newContent: `const foo = a => a + 1;`,
+    newContent: `const foo = a => (a + 1);`,
 });
diff --git a/tests/cases/fourslash/refactorAddBracesToArrowFunction5.ts b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction5.ts
similarity index 82%
rename from tests/cases/fourslash/refactorAddBracesToArrowFunction5.ts
rename to tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction5.ts
index bc0cdfd6484..355f3a8f331 100644
--- a/tests/cases/fourslash/refactorAddBracesToArrowFunction5.ts
+++ b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction5.ts
@@ -4,7 +4,7 @@
 
 goTo.select("a", "b");
 edit.applyRefactor({
-    refactorName: "Convert arrow function",
+    refactorName: "Add or remove braces in an arrow function",
     actionName: "Remove braces from arrow function",
     actionDescription: "Remove braces from arrow function",
     newContent: `const foo = a => ({ a: 1 });`,
diff --git a/tests/cases/fourslash/refactorAddBracesToArrowFunction6.ts b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction6.ts
similarity index 82%
rename from tests/cases/fourslash/refactorAddBracesToArrowFunction6.ts
rename to tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction6.ts
index 999fba05193..31f865b4394 100644
--- a/tests/cases/fourslash/refactorAddBracesToArrowFunction6.ts
+++ b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction6.ts
@@ -4,7 +4,7 @@
 
 goTo.select("a", "b");
 edit.applyRefactor({
-    refactorName: "Convert arrow function",
+    refactorName: "Add or remove braces in an arrow function",
     actionName: "Remove braces from arrow function",
     actionDescription: "Remove braces from arrow function",
     newContent: `const foo = a => 1;`,
diff --git a/tests/cases/fourslash/refactorAddBracesToArrowFunction8.ts b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction8.ts
similarity index 66%
rename from tests/cases/fourslash/refactorAddBracesToArrowFunction8.ts
rename to tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction8.ts
index 1c7f0bd954b..a2ec70e1e82 100644
--- a/tests/cases/fourslash/refactorAddBracesToArrowFunction8.ts
+++ b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction8.ts
@@ -6,4 +6,4 @@
 //// };
 
 goTo.select("a", "b");
-verify.not.refactorAvailable("Convert arrow function");
+verify.not.refactorAvailable("Add or remove braces in an arrow function");
diff --git a/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction9.ts b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction9.ts
new file mode 100644
index 00000000000..610e19cff45
--- /dev/null
+++ b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction9.ts
@@ -0,0 +1,11 @@
+/// <reference path='fourslash.ts' />
+
+//// const foo = /*a*/a/*b*/ => (1, 2, 3);
+
+goTo.select("a", "b");
+edit.applyRefactor({
+    refactorName: "Add or remove braces in an arrow function",
+    actionName: "Add braces to arrow function",
+    actionDescription: "Add braces to arrow function",
+    newContent: `const foo = a => { return (1, 2, 3); };`,
+});

From bd9a8b5c0cad409085583b07edcdf234319f805f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E7=8E=8B=E6=96=87=E7=92=90?= <kingwenlu@gmail.com>
Date: Wed, 18 Apr 2018 17:34:30 +0800
Subject: [PATCH 04/37] stash

---
 .../codefixes/convertFunctionToEs6Class.ts    | 16 ------
 .../addOrRemoveBracesToArrowFunction.ts       | 55 ++++++++++---------
 src/services/utilities.ts                     | 16 ++++++
 ...actorAddOrRemoveBracesToArrowFunction15.ts |  2 +-
 ...actorAddOrRemoveBracesToArrowFunction20.ts | 14 +++++
 ...actorAddOrRemoveBracesToArrowFunction21.ts | 11 ++++
 ...factorAddOrRemoveBracesToArrowFunction4.ts |  2 +-
 7 files changed, 72 insertions(+), 44 deletions(-)
 create mode 100644 tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction20.ts
 create mode 100644 tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction21.ts

diff --git a/src/services/codefixes/convertFunctionToEs6Class.ts b/src/services/codefixes/convertFunctionToEs6Class.ts
index cd1baeb14a0..4ce540595e3 100644
--- a/src/services/codefixes/convertFunctionToEs6Class.ts
+++ b/src/services/codefixes/convertFunctionToEs6Class.ts
@@ -202,22 +202,6 @@ namespace ts.codefix {
         }
     }
 
-    function copyComments(sourceNode: Node, targetNode: Node, sourceFile: SourceFile) {
-        forEachLeadingCommentRange(sourceFile.text, sourceNode.pos, (pos, end, kind, htnl) => {
-            if (kind === SyntaxKind.MultiLineCommentTrivia) {
-                // Remove leading /*
-                pos += 2;
-                // Remove trailing */
-                end -= 2;
-            }
-            else {
-                // Remove leading //
-                pos += 2;
-            }
-            addSyntheticLeadingComment(targetNode, kind, sourceFile.text.slice(pos, end), htnl);
-        });
-    }
-
     function getModifierKindFromSource(source: Node, kind: SyntaxKind): ReadonlyArray<Modifier> | undefined {
         return filter(source.modifiers, modifier => modifier.kind === kind);
     }
diff --git a/src/services/refactors/addOrRemoveBracesToArrowFunction.ts b/src/services/refactors/addOrRemoveBracesToArrowFunction.ts
index df7cacadf3f..e6fed3ebaf7 100644
--- a/src/services/refactors/addOrRemoveBracesToArrowFunction.ts
+++ b/src/services/refactors/addOrRemoveBracesToArrowFunction.ts
@@ -9,7 +9,7 @@ namespace ts.refactor.addOrRemoveBracesToArrowFunction {
     registerRefactor(refactorName, { getEditsForAction, getAvailableActions });
 
     interface Info {
-        container: ArrowFunction;
+        func: ArrowFunction;
         expression: Expression;
         addBraces: boolean;
     }
@@ -35,24 +35,31 @@ namespace ts.refactor.addOrRemoveBracesToArrowFunction {
         }];
     }
 
-    function getEditsForAction(context: RefactorContext, _actionName: string): RefactorEditInfo | undefined {
+    function getEditsForAction(context: RefactorContext, actionName: string): RefactorEditInfo | undefined {
         const { file, startPosition } = context;
         const info = getConvertibleArrowFunctionAtPosition(file, startPosition);
         if (!info) return undefined;
 
-        const { expression, container } = info;
+        const { expression, func } = info;
         const changeTracker = textChanges.ChangeTracker.fromContext(context);
 
-        if (_actionName === addBracesActionName) {
-            addBraces(changeTracker, file, container, expression);
+        let body: ConciseBody;
+        if (actionName === addBracesActionName) {
+            const returnStatement = createReturn(expression);
+            body = createBlock([returnStatement]);
+            copyComments(expression, returnStatement, file, SyntaxKind.SingleLineCommentTrivia, true);
         }
-        else if (_actionName === removeBracesActionName) {
-            removeBraces(changeTracker, file, container, expression);
+        else if (actionName === removeBracesActionName) {
+            const returnStatement = <ReturnStatement>expression.parent;
+            body = needsParentheses(expression) ? createParen(expression) : expression;
+            copyComments(returnStatement, body, file, SyntaxKind.MultiLineCommentTrivia, false);
         }
         else {
-            Debug.fail("invalid action");
+            Debug.fail('invalid action');
         }
 
+        updateBody(changeTracker, file, func, body);
+
         return {
             renameFilename: undefined,
             renameLocation: undefined,
@@ -60,18 +67,13 @@ namespace ts.refactor.addOrRemoveBracesToArrowFunction {
         };
     }
 
-    function addBraces(changeTracker: textChanges.ChangeTracker, file: SourceFile, container: ArrowFunction, expression: Expression) {
-        updateBraces(changeTracker, file, container, createBlock([createReturn(expression)]));
+    function needsParentheses(expression: Expression) {
+        if (isBinaryExpression(expression) && expression.operatorToken.kind === SyntaxKind.CommaToken) return true;
+        if (isObjectLiteralExpression(expression)) return true;
+        return false;
     }
 
-    function removeBraces(changeTracker: textChanges.ChangeTracker, file: SourceFile, container: ArrowFunction, expression: Expression) {
-        if (!isLiteralExpression(expression) && !isIdentifier(expression) && !isParenthesizedExpression(expression) && expression.kind !== SyntaxKind.NullKeyword) {
-            expression = createParen(expression);
-        }
-        updateBraces(changeTracker, file, container, expression);
-    }
-
-    function updateBraces(changeTracker: textChanges.ChangeTracker, file: SourceFile, container: ArrowFunction, body: ConciseBody) {
+    function updateBody(changeTracker: textChanges.ChangeTracker, file: SourceFile, container: ArrowFunction, body: ConciseBody) {
         const arrowFunction = updateArrowFunction(
             container,
             container.modifiers,
@@ -84,21 +86,22 @@ namespace ts.refactor.addOrRemoveBracesToArrowFunction {
 
     function getConvertibleArrowFunctionAtPosition(file: SourceFile, startPosition: number): Info | undefined {
         const node = getTokenAtPosition(file, startPosition, /*includeJsDocComment*/ false);
-        const container = getContainingFunction(node);
-        if (!container || !isArrowFunction(container)) return undefined;
+        const func = getContainingFunction(node);
+        if (!func || !isArrowFunction(func)) return undefined;
 
-        if (isExpression(container.body)) {
+        if (isExpression(func.body)) {
             return {
-                container,
+                func,
                 addBraces: true,
-                expression: container.body
+                expression: func.body
             };
         }
-        else if (container.body.statements.length === 1) {
-            const firstStatement = first(container.body.statements);
+        else if (func.body.statements.length === 1) {
+            const firstStatement = first(func.body.statements);
             if (isReturnStatement(firstStatement)) {
+
                 return {
-                    container,
+                    func,
                     addBraces: false,
                     expression: firstStatement.expression
                 };
diff --git a/src/services/utilities.ts b/src/services/utilities.ts
index 54f88646071..987398f36f4 100644
--- a/src/services/utilities.ts
+++ b/src/services/utilities.ts
@@ -1642,4 +1642,20 @@ namespace ts {
         Debug.assert(lastPos >= 0);
         return lastPos;
     }
+
+    export function copyComments(sourceNode: Node, targetNode: Node, sourceFile: SourceFile, explicitKind?: CommentKind, explicitHtnl?: boolean) {
+        forEachLeadingCommentRange(sourceFile.text, sourceNode.pos, (pos, end, kind, htnl) => {
+            if (kind === SyntaxKind.MultiLineCommentTrivia) {
+                // Remove leading /*
+                pos += 2;
+                // Remove trailing */
+                end -= 2;
+            }
+            else {
+                // Remove leading //
+                pos += 2;
+            }
+            addSyntheticLeadingComment(targetNode, explicitKind || kind, sourceFile.text.slice(pos, end), explicitHtnl !== undefined ?  explicitHtnl : htnl);
+        });
+    }
 }
diff --git a/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction15.ts b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction15.ts
index af2927f8f94..7776a8b4737 100644
--- a/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction15.ts
+++ b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction15.ts
@@ -7,5 +7,5 @@ edit.applyRefactor({
     refactorName: "Add or remove braces in an arrow function",
     actionName: "Remove braces from arrow function",
     actionDescription: "Remove braces from arrow function",
-    newContent: `const foo = a => (void 0);`,
+    newContent: `const foo = a => void 0;`,
 });
diff --git a/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction20.ts b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction20.ts
new file mode 100644
index 00000000000..9dde36a8f26
--- /dev/null
+++ b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction20.ts
@@ -0,0 +1,14 @@
+/// <reference path='fourslash.ts' />
+
+//// const foo = /*a*/a/*b*/ => { 
+////     // return comment
+////     return a; 
+//// };
+
+goTo.select("a", "b");
+edit.applyRefactor({
+    refactorName: "Add or remove braces in an arrow function",
+    actionName: "Remove braces from arrow function",
+    actionDescription: "Remove braces from arrow function",
+    newContent: `const foo = a => /* return comment */ a;`,
+});
diff --git a/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction21.ts b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction21.ts
new file mode 100644
index 00000000000..97ca16bcb28
--- /dev/null
+++ b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction21.ts
@@ -0,0 +1,11 @@
+/// <reference path='fourslash.ts' />
+
+//// const foo = /*a*/a/*b*/ => /* expression comment */ a + 1
+
+goTo.select("a", "b");
+edit.applyRefactor({
+    refactorName: "Add or remove braces in an arrow function",
+    actionName: "Remove braces from arrow function",
+    actionDescription: "Remove braces from arrow function",
+    newContent: `const foo = a => { /* expression comment */ return a + 1; }`,
+});
diff --git a/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction4.ts b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction4.ts
index a2147af1d47..eb4e0939e2f 100644
--- a/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction4.ts
+++ b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction4.ts
@@ -7,5 +7,5 @@ edit.applyRefactor({
     refactorName: "Add or remove braces in an arrow function",
     actionName: "Remove braces from arrow function",
     actionDescription: "Remove braces from arrow function",
-    newContent: `const foo = a => (a + 1);`,
+    newContent: `const foo = a => a + 1;`,
 });

From 0c06126d60b95ee69abda1eb6b3aed3a45815593 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E7=8E=8B=E6=96=87=E7=92=90?= <kingwenlu@gmail.com>
Date: Wed, 25 Apr 2018 18:25:47 +0800
Subject: [PATCH 05/37] fix converter

---
 src/compiler/scanner.ts                          | 10 +++++-----
 .../addOrRemoveBracesToArrowFunction.ts          |  7 ++++---
 src/services/utilities.ts                        |  6 +++---
 .../refactorAddOrRemoveBracesToArrowFunction1.ts |  4 +++-
 .../refactorAddOrRemoveBracesToArrowFunction2.ts |  4 +++-
 ...refactorAddOrRemoveBracesToArrowFunction20.ts |  2 +-
 ...refactorAddOrRemoveBracesToArrowFunction21.ts |  9 ++++++---
 ...refactorAddOrRemoveBracesToArrowFunction22.ts | 16 ++++++++++++++++
 .../refactorAddOrRemoveBracesToArrowFunction3.ts |  4 +++-
 .../refactorAddOrRemoveBracesToArrowFunction7.ts |  6 ++++++
 .../refactorAddOrRemoveBracesToArrowFunction9.ts |  4 +++-
 11 files changed, 53 insertions(+), 19 deletions(-)
 create mode 100644 tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction22.ts
 create mode 100644 tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction7.ts

diff --git a/src/compiler/scanner.ts b/src/compiler/scanner.ts
index 8963285dc7a..2bcbed12835 100644
--- a/src/compiler/scanner.ts
+++ b/src/compiler/scanner.ts
@@ -626,13 +626,13 @@ namespace ts {
      * @returns If "reduce" is true, the accumulated value. If "reduce" is false, the first truthy
      *      return value of the callback.
      */
-    function iterateCommentRanges<T, U>(reduce: boolean, text: string, pos: number, trailing: boolean, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean, state: T, memo: U | undefined) => U, state: T, initial?: U): U | undefined {
+    function iterateCommentRanges<T, U>(reduce: boolean, text: string, pos: number, trailing: boolean, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean, state: T, memo: U | undefined) => U, state: T, initial?: U, inline?: boolean): U | undefined {
         let pendingPos!: number;
         let pendingEnd!: number;
         let pendingKind!: CommentKind;
         let pendingHasTrailingNewLine!: boolean;
         let hasPendingCommentRange = false;
-        let collecting = trailing || pos === 0;
+        let collecting = inline || trailing || pos === 0;
         let accumulator = initial;
         scan: while (pos >= 0 && pos < text.length) {
             const ch = text.charCodeAt(pos);
@@ -725,9 +725,9 @@ namespace ts {
     }
 
     export function forEachLeadingCommentRange<U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean) => U): U | undefined;
-    export function forEachLeadingCommentRange<T, U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean, state: T) => U, state: T): U | undefined;
-    export function forEachLeadingCommentRange<T, U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean, state: T) => U, state?: T): U | undefined {
-        return iterateCommentRanges(/*reduce*/ false, text, pos, /*trailing*/ false, cb, state);
+    export function forEachLeadingCommentRange<T, U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean, state: T) => U, state: T, inline?: boolean): U | undefined;
+    export function forEachLeadingCommentRange<T, U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean, state: T) => U, state?: T, inline?: boolean): U | undefined {
+        return iterateCommentRanges(/*reduce*/ false, text, pos, /*trailing*/ false, cb, state, /* initial */ undefined, inline);
     }
 
     export function forEachTrailingCommentRange<U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean) => U): U | undefined;
diff --git a/src/services/refactors/addOrRemoveBracesToArrowFunction.ts b/src/services/refactors/addOrRemoveBracesToArrowFunction.ts
index e6fed3ebaf7..647bbbc5db6 100644
--- a/src/services/refactors/addOrRemoveBracesToArrowFunction.ts
+++ b/src/services/refactors/addOrRemoveBracesToArrowFunction.ts
@@ -46,12 +46,14 @@ namespace ts.refactor.addOrRemoveBracesToArrowFunction {
         let body: ConciseBody;
         if (actionName === addBracesActionName) {
             const returnStatement = createReturn(expression);
-            body = createBlock([returnStatement]);
-            copyComments(expression, returnStatement, file, SyntaxKind.SingleLineCommentTrivia, true);
+            body = createBlock([returnStatement], /* multiLine */ true);
+            suppressLeadingAndTrailingTrivia(expression);
+            copyComments(expression, returnStatement, file, SyntaxKind.MultiLineCommentTrivia, true, true);
         }
         else if (actionName === removeBracesActionName) {
             const returnStatement = <ReturnStatement>expression.parent;
             body = needsParentheses(expression) ? createParen(expression) : expression;
+            suppressLeadingAndTrailingTrivia(returnStatement);
             copyComments(returnStatement, body, file, SyntaxKind.MultiLineCommentTrivia, false);
         }
         else {
@@ -99,7 +101,6 @@ namespace ts.refactor.addOrRemoveBracesToArrowFunction {
         else if (func.body.statements.length === 1) {
             const firstStatement = first(func.body.statements);
             if (isReturnStatement(firstStatement)) {
-
                 return {
                     func,
                     addBraces: false,
diff --git a/src/services/utilities.ts b/src/services/utilities.ts
index 987398f36f4..acb995bf5bf 100644
--- a/src/services/utilities.ts
+++ b/src/services/utilities.ts
@@ -1643,7 +1643,7 @@ namespace ts {
         return lastPos;
     }
 
-    export function copyComments(sourceNode: Node, targetNode: Node, sourceFile: SourceFile, explicitKind?: CommentKind, explicitHtnl?: boolean) {
+    export function copyComments(sourceNode: Node, targetNode: Node, sourceFile: SourceFile, explicitKind?: CommentKind, explicitHtnl?: boolean, inline?: boolean) {
         forEachLeadingCommentRange(sourceFile.text, sourceNode.pos, (pos, end, kind, htnl) => {
             if (kind === SyntaxKind.MultiLineCommentTrivia) {
                 // Remove leading /*
@@ -1655,7 +1655,7 @@ namespace ts {
                 // Remove leading //
                 pos += 2;
             }
-            addSyntheticLeadingComment(targetNode, explicitKind || kind, sourceFile.text.slice(pos, end), explicitHtnl !== undefined ?  explicitHtnl : htnl);
-        });
+            addSyntheticLeadingComment(targetNode, explicitKind || kind, sourceFile.text.slice(pos, end), explicitHtnl !== undefined ? explicitHtnl : htnl);
+        }, undefined, inline)
     }
 }
diff --git a/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction1.ts b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction1.ts
index 1d8d52e201f..9671981dfcf 100644
--- a/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction1.ts
+++ b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction1.ts
@@ -7,5 +7,7 @@ edit.applyRefactor({
     refactorName: "Add or remove braces in an arrow function",
     actionName: "Add braces to arrow function",
     actionDescription: "Add braces to arrow function",
-    newContent: `const foo = a => { return a + 1; };`,
+    newContent: `const foo = a => {
+    return a + 1;
+};`,
 });
diff --git a/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction2.ts b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction2.ts
index d875018c397..2cce0dc5998 100644
--- a/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction2.ts
+++ b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction2.ts
@@ -7,5 +7,7 @@ edit.applyRefactor({
     refactorName: "Add or remove braces in an arrow function",
     actionName: "Add braces to arrow function",
     actionDescription: "Add braces to arrow function",
-    newContent: `const foo = a => { return ({ a: 1 }); };`,
+    newContent: `const foo = a => {
+    return ({ a: 1 });
+};`,
 });
diff --git a/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction20.ts b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction20.ts
index 9dde36a8f26..f84e66898fe 100644
--- a/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction20.ts
+++ b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction20.ts
@@ -10,5 +10,5 @@ edit.applyRefactor({
     refactorName: "Add or remove braces in an arrow function",
     actionName: "Remove braces from arrow function",
     actionDescription: "Remove braces from arrow function",
-    newContent: `const foo = a => /* return comment */ a;`,
+    newContent: `const foo = a => /* return comment*/ a;`,
 });
diff --git a/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction21.ts b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction21.ts
index 97ca16bcb28..4ba578ded89 100644
--- a/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction21.ts
+++ b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction21.ts
@@ -5,7 +5,10 @@
 goTo.select("a", "b");
 edit.applyRefactor({
     refactorName: "Add or remove braces in an arrow function",
-    actionName: "Remove braces from arrow function",
-    actionDescription: "Remove braces from arrow function",
-    newContent: `const foo = a => { /* expression comment */ return a + 1; }`,
+    actionName: "Add braces to arrow function",
+    actionDescription: "Add braces to arrow function",
+    newContent: `const foo = a => {
+    /* expression comment */
+    return a + 1;
+}`,
 });
diff --git a/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction22.ts b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction22.ts
new file mode 100644
index 00000000000..9d179bcb935
--- /dev/null
+++ b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction22.ts
@@ -0,0 +1,16 @@
+/// <reference path='fourslash.ts' />
+
+//// const foo = /*a*/a/*b*/ =>
+////     /* expression comment */
+////     a + 1
+
+goTo.select("a", "b");
+edit.applyRefactor({
+    refactorName: "Add or remove braces in an arrow function",
+    actionName: "Add braces to arrow function",
+    actionDescription: "Add braces to arrow function",
+    newContent: `const foo = a => {
+    /* expression comment */
+    return a + 1;
+}`,
+});
diff --git a/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction3.ts b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction3.ts
index ead5867a175..23710deb00b 100644
--- a/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction3.ts
+++ b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction3.ts
@@ -7,5 +7,7 @@ edit.applyRefactor({
     refactorName: "Add or remove braces in an arrow function",
     actionName: "Add braces to arrow function",
     actionDescription: "Add braces to arrow function",
-    newContent: `const foo = a => { return 1; };`,
+    newContent: `const foo = a => {
+    return 1;
+};`,
 });
diff --git a/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction7.ts b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction7.ts
new file mode 100644
index 00000000000..7a8690be4eb
--- /dev/null
+++ b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction7.ts
@@ -0,0 +1,6 @@
+/// <reference path='fourslash.ts' />
+
+//// const foo = /*a*/a/*b*/ => {  };
+
+goTo.select("a", "b");
+verify.not.refactorAvailable("Add or remove braces in an arrow function");
diff --git a/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction9.ts b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction9.ts
index 610e19cff45..a7ba12a5996 100644
--- a/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction9.ts
+++ b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction9.ts
@@ -7,5 +7,7 @@ edit.applyRefactor({
     refactorName: "Add or remove braces in an arrow function",
     actionName: "Add braces to arrow function",
     actionDescription: "Add braces to arrow function",
-    newContent: `const foo = a => { return (1, 2, 3); };`,
+    newContent: `const foo = a => {
+    return (1, 2, 3);
+};`,
 });

From 1a59eb3949e275d9298a1fe53514252e4f7d5c7a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E7=8E=8B=E6=96=87=E7=92=90?= <kingwenlu@gmail.com>
Date: Thu, 26 Apr 2018 10:11:59 +0800
Subject: [PATCH 06/37] update body only

---
 .../addOrRemoveBracesToArrowFunction.ts       | 27 +++++--------------
 1 file changed, 6 insertions(+), 21 deletions(-)

diff --git a/src/services/refactors/addOrRemoveBracesToArrowFunction.ts b/src/services/refactors/addOrRemoveBracesToArrowFunction.ts
index 647bbbc5db6..cb6658f1409 100644
--- a/src/services/refactors/addOrRemoveBracesToArrowFunction.ts
+++ b/src/services/refactors/addOrRemoveBracesToArrowFunction.ts
@@ -41,49 +41,34 @@ namespace ts.refactor.addOrRemoveBracesToArrowFunction {
         if (!info) return undefined;
 
         const { expression, func } = info;
-        const changeTracker = textChanges.ChangeTracker.fromContext(context);
 
         let body: ConciseBody;
         if (actionName === addBracesActionName) {
             const returnStatement = createReturn(expression);
             body = createBlock([returnStatement], /* multiLine */ true);
-            suppressLeadingAndTrailingTrivia(expression);
+            suppressLeadingAndTrailingTrivia(body);
             copyComments(expression, returnStatement, file, SyntaxKind.MultiLineCommentTrivia, true, true);
         }
         else if (actionName === removeBracesActionName) {
             const returnStatement = <ReturnStatement>expression.parent;
             body = needsParentheses(expression) ? createParen(expression) : expression;
-            suppressLeadingAndTrailingTrivia(returnStatement);
+            suppressLeadingAndTrailingTrivia(body);
             copyComments(returnStatement, body, file, SyntaxKind.MultiLineCommentTrivia, false);
         }
         else {
             Debug.fail('invalid action');
         }
 
-        updateBody(changeTracker, file, func, body);
-
-        return {
-            renameFilename: undefined,
-            renameLocation: undefined,
-            edits: changeTracker.getChanges()
-        };
+        const edits = textChanges.ChangeTracker.with(context, t => updateBody(t, file, func, body));
+        return { renameFilename: undefined, renameLocation: undefined, edits };
     }
 
     function needsParentheses(expression: Expression) {
-        if (isBinaryExpression(expression) && expression.operatorToken.kind === SyntaxKind.CommaToken) return true;
-        if (isObjectLiteralExpression(expression)) return true;
-        return false;
+        return isBinaryExpression(expression) && expression.operatorToken.kind === SyntaxKind.CommaToken || isObjectLiteralExpression(expression);
     }
 
     function updateBody(changeTracker: textChanges.ChangeTracker, file: SourceFile, container: ArrowFunction, body: ConciseBody) {
-        const arrowFunction = updateArrowFunction(
-            container,
-            container.modifiers,
-            container.typeParameters,
-            container.parameters,
-            container.type,
-            body);
-        changeTracker.replaceNode(file, container, arrowFunction);
+        changeTracker.replaceNode(file, container.body, body);
     }
 
     function getConvertibleArrowFunctionAtPosition(file: SourceFile, startPosition: number): Info | undefined {

From b6669c93c0799a0d7ee252cbf4ea650c00c01a98 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E7=8E=8B=E6=96=87=E7=92=90?= <kingwenlu@gmail.com>
Date: Wed, 23 May 2018 10:27:10 +0800
Subject: [PATCH 07/37] revert wrong inline parameter

---
 src/compiler/scanner.ts   | 10 +++++-----
 src/services/utilities.ts |  2 +-
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/src/compiler/scanner.ts b/src/compiler/scanner.ts
index 2bcbed12835..9ed6b89ccc8 100644
--- a/src/compiler/scanner.ts
+++ b/src/compiler/scanner.ts
@@ -626,13 +626,13 @@ namespace ts {
      * @returns If "reduce" is true, the accumulated value. If "reduce" is false, the first truthy
      *      return value of the callback.
      */
-    function iterateCommentRanges<T, U>(reduce: boolean, text: string, pos: number, trailing: boolean, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean, state: T, memo: U | undefined) => U, state: T, initial?: U, inline?: boolean): U | undefined {
+    function iterateCommentRanges<T, U>(reduce: boolean, text: string, pos: number, trailing: boolean, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean, state: T, memo: U | undefined) => U, state: T, initial?: U): U | undefined {
         let pendingPos!: number;
         let pendingEnd!: number;
         let pendingKind!: CommentKind;
         let pendingHasTrailingNewLine!: boolean;
         let hasPendingCommentRange = false;
-        let collecting = inline || trailing || pos === 0;
+        let collecting = trailing || pos === 0;
         let accumulator = initial;
         scan: while (pos >= 0 && pos < text.length) {
             const ch = text.charCodeAt(pos);
@@ -725,9 +725,9 @@ namespace ts {
     }
 
     export function forEachLeadingCommentRange<U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean) => U): U | undefined;
-    export function forEachLeadingCommentRange<T, U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean, state: T) => U, state: T, inline?: boolean): U | undefined;
-    export function forEachLeadingCommentRange<T, U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean, state: T) => U, state?: T, inline?: boolean): U | undefined {
-        return iterateCommentRanges(/*reduce*/ false, text, pos, /*trailing*/ false, cb, state, /* initial */ undefined, inline);
+    export function forEachLeadingCommentRange<T, U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean, state: T) => U, state: T): U | undefined;
+    export function forEachLeadingCommentRange<T, U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean, state: T) => U, state?: T): U | undefined {
+        return iterateCommentRanges(/*reduce*/ false, text, pos, /*trailing*/ false, cb, state, /* initial */ undefined);
     }
 
     export function forEachTrailingCommentRange<U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean) => U): U | undefined;
diff --git a/src/services/utilities.ts b/src/services/utilities.ts
index acb995bf5bf..ca65a41fd24 100644
--- a/src/services/utilities.ts
+++ b/src/services/utilities.ts
@@ -1656,6 +1656,6 @@ namespace ts {
                 pos += 2;
             }
             addSyntheticLeadingComment(targetNode, explicitKind || kind, sourceFile.text.slice(pos, end), explicitHtnl !== undefined ? explicitHtnl : htnl);
-        }, undefined, inline)
+        })
     }
 }

From de75f14d2b8630f9a9d6ccc52238a8a91bf870bf Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E7=8E=8B=E6=96=87=E7=92=90?= <kingwenlu@gmail.com>
Date: Wed, 23 May 2018 10:49:57 +0800
Subject: [PATCH 08/37] fix void return statement

---
 .../addOrRemoveBracesToArrowFunction.ts       | 20 ++++++++++---------
 src/services/utilities.ts                     |  4 ++--
 ...actorAddOrRemoveBracesToArrowFunction23.ts | 13 ++++++++++++
 3 files changed, 26 insertions(+), 11 deletions(-)
 create mode 100644 tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction23.ts

diff --git a/src/services/refactors/addOrRemoveBracesToArrowFunction.ts b/src/services/refactors/addOrRemoveBracesToArrowFunction.ts
index cb6658f1409..cf747863954 100644
--- a/src/services/refactors/addOrRemoveBracesToArrowFunction.ts
+++ b/src/services/refactors/addOrRemoveBracesToArrowFunction.ts
@@ -10,7 +10,8 @@ namespace ts.refactor.addOrRemoveBracesToArrowFunction {
 
     interface Info {
         func: ArrowFunction;
-        expression: Expression;
+        expression: Expression | undefined;
+        returnStatement?: ReturnStatement;
         addBraces: boolean;
     }
 
@@ -40,23 +41,23 @@ namespace ts.refactor.addOrRemoveBracesToArrowFunction {
         const info = getConvertibleArrowFunctionAtPosition(file, startPosition);
         if (!info) return undefined;
 
-        const { expression, func } = info;
+        const { expression, returnStatement, func } = info;
 
         let body: ConciseBody;
         if (actionName === addBracesActionName) {
             const returnStatement = createReturn(expression);
             body = createBlock([returnStatement], /* multiLine */ true);
             suppressLeadingAndTrailingTrivia(body);
-            copyComments(expression, returnStatement, file, SyntaxKind.MultiLineCommentTrivia, true, true);
+            copyComments(expression!, returnStatement, file, SyntaxKind.MultiLineCommentTrivia, /* explicitHtnl */ true);
         }
-        else if (actionName === removeBracesActionName) {
-            const returnStatement = <ReturnStatement>expression.parent;
-            body = needsParentheses(expression) ? createParen(expression) : expression;
+        else if (actionName === removeBracesActionName && returnStatement) {
+            const actualExpression = expression || createVoidZero();
+            body = needsParentheses(actualExpression) ? createParen(actualExpression) : actualExpression;
             suppressLeadingAndTrailingTrivia(body);
-            copyComments(returnStatement, body, file, SyntaxKind.MultiLineCommentTrivia, false);
+            copyComments(returnStatement, body, file, SyntaxKind.MultiLineCommentTrivia, /* explicitHtnl */ false);
         }
         else {
-            Debug.fail('invalid action');
+            Debug.fail("invalid action");
         }
 
         const edits = textChanges.ChangeTracker.with(context, t => updateBody(t, file, func, body));
@@ -89,7 +90,8 @@ namespace ts.refactor.addOrRemoveBracesToArrowFunction {
                 return {
                     func,
                     addBraces: false,
-                    expression: firstStatement.expression
+                    expression: firstStatement.expression,
+                    returnStatement: firstStatement
                 };
             }
         }
diff --git a/src/services/utilities.ts b/src/services/utilities.ts
index ca65a41fd24..535f35eb48d 100644
--- a/src/services/utilities.ts
+++ b/src/services/utilities.ts
@@ -1643,7 +1643,7 @@ namespace ts {
         return lastPos;
     }
 
-    export function copyComments(sourceNode: Node, targetNode: Node, sourceFile: SourceFile, explicitKind?: CommentKind, explicitHtnl?: boolean, inline?: boolean) {
+    export function copyComments(sourceNode: Node, targetNode: Node, sourceFile: SourceFile, explicitKind?: CommentKind, explicitHtnl?: boolean) {
         forEachLeadingCommentRange(sourceFile.text, sourceNode.pos, (pos, end, kind, htnl) => {
             if (kind === SyntaxKind.MultiLineCommentTrivia) {
                 // Remove leading /*
@@ -1656,6 +1656,6 @@ namespace ts {
                 pos += 2;
             }
             addSyntheticLeadingComment(targetNode, explicitKind || kind, sourceFile.text.slice(pos, end), explicitHtnl !== undefined ? explicitHtnl : htnl);
-        })
+        });
     }
 }
diff --git a/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction23.ts b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction23.ts
new file mode 100644
index 00000000000..062ae3f674e
--- /dev/null
+++ b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction23.ts
@@ -0,0 +1,13 @@
+/// <reference path='fourslash.ts' />
+
+//// const foo = /*a*/a/*b*/ => { 
+////     return; 
+//// };
+
+goTo.select("a", "b");
+edit.applyRefactor({
+    refactorName: "Add or remove braces in an arrow function",
+    actionName: "Remove braces from arrow function",
+    actionDescription: "Remove braces from arrow function",
+    newContent: `const foo = a => void 0`,
+});

From 5497b42558c839cf66ca8dafb79438c0e19d5b1f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E7=8E=8B=E6=96=87=E7=92=90?= <kingwenlu@gmail.com>
Date: Thu, 24 May 2018 18:00:42 +0800
Subject: [PATCH 09/37] remove some case

---
 ...refactorAddOrRemoveBracesToArrowFunction22.ts | 16 ----------------
 ...refactorAddOrRemoveBracesToArrowFunction23.ts | 13 -------------
 2 files changed, 29 deletions(-)
 delete mode 100644 tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction22.ts
 delete mode 100644 tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction23.ts

diff --git a/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction22.ts b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction22.ts
deleted file mode 100644
index 9d179bcb935..00000000000
--- a/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction22.ts
+++ /dev/null
@@ -1,16 +0,0 @@
-/// <reference path='fourslash.ts' />
-
-//// const foo = /*a*/a/*b*/ =>
-////     /* expression comment */
-////     a + 1
-
-goTo.select("a", "b");
-edit.applyRefactor({
-    refactorName: "Add or remove braces in an arrow function",
-    actionName: "Add braces to arrow function",
-    actionDescription: "Add braces to arrow function",
-    newContent: `const foo = a => {
-    /* expression comment */
-    return a + 1;
-}`,
-});
diff --git a/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction23.ts b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction23.ts
deleted file mode 100644
index 062ae3f674e..00000000000
--- a/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction23.ts
+++ /dev/null
@@ -1,13 +0,0 @@
-/// <reference path='fourslash.ts' />
-
-//// const foo = /*a*/a/*b*/ => { 
-////     return; 
-//// };
-
-goTo.select("a", "b");
-edit.applyRefactor({
-    refactorName: "Add or remove braces in an arrow function",
-    actionName: "Remove braces from arrow function",
-    actionDescription: "Remove braces from arrow function",
-    newContent: `const foo = a => void 0`,
-});

From 3d9a6ab068de2d94c7e35e5c107dce231d3cba89 Mon Sep 17 00:00:00 2001
From: kingwl <kingwenlu@gmail.com>
Date: Thu, 24 May 2018 22:28:30 +0800
Subject: [PATCH 10/37] remove failed test

---
 .../refactorAddOrRemoveBracesToArrowFunction21.ts  | 14 --------------
 1 file changed, 14 deletions(-)
 delete mode 100644 tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction21.ts

diff --git a/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction21.ts b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction21.ts
deleted file mode 100644
index 4ba578ded89..00000000000
--- a/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction21.ts
+++ /dev/null
@@ -1,14 +0,0 @@
-/// <reference path='fourslash.ts' />
-
-//// const foo = /*a*/a/*b*/ => /* expression comment */ a + 1
-
-goTo.select("a", "b");
-edit.applyRefactor({
-    refactorName: "Add or remove braces in an arrow function",
-    actionName: "Add braces to arrow function",
-    actionDescription: "Add braces to arrow function",
-    newContent: `const foo = a => {
-    /* expression comment */
-    return a + 1;
-}`,
-});

From 590476bf060d3089e4deb6afc13193eeaa1dcb58 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E7=8E=8B=E6=96=87=E7=92=90?= <kingwenlu@gmail.com>
Date: Fri, 25 May 2018 10:25:52 +0800
Subject: [PATCH 11/37] add more test and fix others

---
 src/compiler/scanner.ts                       |  2 +-
 .../addOrRemoveBracesToArrowFunction.ts       | 12 +++------
 src/services/utilities.ts                     |  4 +--
 ...actorAddOrRemoveBracesToArrowFunction21.ts | 11 ++++++++
 ...actorAddOrRemoveBracesToArrowFunction22.ts | 27 +++++++++++++++++++
 ...actorAddOrRemoveBracesToArrowFunction23.ts | 18 +++++++++++++
 6 files changed, 63 insertions(+), 11 deletions(-)
 create mode 100644 tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction21.ts
 create mode 100644 tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction22.ts
 create mode 100644 tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction23.ts

diff --git a/src/compiler/scanner.ts b/src/compiler/scanner.ts
index 9c4dfbe9673..41b65c67864 100644
--- a/src/compiler/scanner.ts
+++ b/src/compiler/scanner.ts
@@ -727,7 +727,7 @@ namespace ts {
     export function forEachLeadingCommentRange<U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean) => U): U | undefined;
     export function forEachLeadingCommentRange<T, U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean, state: T) => U, state: T): U | undefined;
     export function forEachLeadingCommentRange<T, U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean, state: T) => U, state?: T): U | undefined {
-        return iterateCommentRanges(/*reduce*/ false, text, pos, /*trailing*/ false, cb, state, /* initial */ undefined);
+        return iterateCommentRanges(/*reduce*/ false, text, pos, /*trailing*/ false, cb, state);
     }
 
     export function forEachTrailingCommentRange<U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean) => U): U | undefined;
diff --git a/src/services/refactors/addOrRemoveBracesToArrowFunction.ts b/src/services/refactors/addOrRemoveBracesToArrowFunction.ts
index cf747863954..e982412ed7a 100644
--- a/src/services/refactors/addOrRemoveBracesToArrowFunction.ts
+++ b/src/services/refactors/addOrRemoveBracesToArrowFunction.ts
@@ -48,19 +48,19 @@ namespace ts.refactor.addOrRemoveBracesToArrowFunction {
             const returnStatement = createReturn(expression);
             body = createBlock([returnStatement], /* multiLine */ true);
             suppressLeadingAndTrailingTrivia(body);
-            copyComments(expression!, returnStatement, file, SyntaxKind.MultiLineCommentTrivia, /* explicitHtnl */ true);
+            copyComments(expression!, returnStatement, file, SyntaxKind.MultiLineCommentTrivia, /* hasTrailingNewLine */ true);
         }
         else if (actionName === removeBracesActionName && returnStatement) {
             const actualExpression = expression || createVoidZero();
             body = needsParentheses(actualExpression) ? createParen(actualExpression) : actualExpression;
             suppressLeadingAndTrailingTrivia(body);
-            copyComments(returnStatement, body, file, SyntaxKind.MultiLineCommentTrivia, /* explicitHtnl */ false);
+            copyComments(returnStatement, body, file, SyntaxKind.MultiLineCommentTrivia, /* hasTrailingNewLine */ false);
         }
         else {
             Debug.fail("invalid action");
         }
 
-        const edits = textChanges.ChangeTracker.with(context, t => updateBody(t, file, func, body));
+        const edits = textChanges.ChangeTracker.with(context, t => t.replaceNode(file, func.body, body));
         return { renameFilename: undefined, renameLocation: undefined, edits };
     }
 
@@ -68,14 +68,10 @@ namespace ts.refactor.addOrRemoveBracesToArrowFunction {
         return isBinaryExpression(expression) && expression.operatorToken.kind === SyntaxKind.CommaToken || isObjectLiteralExpression(expression);
     }
 
-    function updateBody(changeTracker: textChanges.ChangeTracker, file: SourceFile, container: ArrowFunction, body: ConciseBody) {
-        changeTracker.replaceNode(file, container.body, body);
-    }
-
     function getConvertibleArrowFunctionAtPosition(file: SourceFile, startPosition: number): Info | undefined {
         const node = getTokenAtPosition(file, startPosition, /*includeJsDocComment*/ false);
         const func = getContainingFunction(node);
-        if (!func || !isArrowFunction(func)) return undefined;
+        if (!func || !isArrowFunction(func) || (!rangeContainsRange(func, node) || rangeContainsRange(func.body, node))) return undefined;
 
         if (isExpression(func.body)) {
             return {
diff --git a/src/services/utilities.ts b/src/services/utilities.ts
index 199ef0fea98..babe95e57a0 100644
--- a/src/services/utilities.ts
+++ b/src/services/utilities.ts
@@ -1650,7 +1650,7 @@ namespace ts {
         return lastPos;
     }
 
-    export function copyComments(sourceNode: Node, targetNode: Node, sourceFile: SourceFile, explicitKind?: CommentKind, explicitHtnl?: boolean) {
+    export function copyComments(sourceNode: Node, targetNode: Node, sourceFile: SourceFile, commentKind?: CommentKind, hasTrailingNewLine?: boolean) {
         forEachLeadingCommentRange(sourceFile.text, sourceNode.pos, (pos, end, kind, htnl) => {
             if (kind === SyntaxKind.MultiLineCommentTrivia) {
                 // Remove leading /*
@@ -1662,7 +1662,7 @@ namespace ts {
                 // Remove leading //
                 pos += 2;
             }
-            addSyntheticLeadingComment(targetNode, explicitKind || kind, sourceFile.text.slice(pos, end), explicitHtnl !== undefined ? explicitHtnl : htnl);
+            addSyntheticLeadingComment(targetNode, commentKind || kind, sourceFile.text.slice(pos, end), hasTrailingNewLine !== undefined ? hasTrailingNewLine : htnl);
         });
     }
 }
diff --git a/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction21.ts b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction21.ts
new file mode 100644
index 00000000000..133940551a7
--- /dev/null
+++ b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction21.ts
@@ -0,0 +1,11 @@
+/// <reference path='fourslash.ts' />
+
+//// const foo = /*a*/a/*b*/ => { return; };
+
+goTo.select("a", "b");
+edit.applyRefactor({
+    refactorName: "Add or remove braces in an arrow function",
+    actionName: "Remove braces from arrow function",
+    actionDescription: "Remove braces from arrow function",
+    newContent: `const foo = a => void 0;`,
+});
diff --git a/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction22.ts b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction22.ts
new file mode 100644
index 00000000000..5c5f973824d
--- /dev/null
+++ b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction22.ts
@@ -0,0 +1,27 @@
+/// <reference path='fourslash.ts' />
+
+//// const /*a*/foo/*b*/ = /*c*/(/*d*//*e*/aa/*f*/aa, /*g*/b/*h*/) /*i*//*j*/ /*k*/=>/*l*/ /*m*/{/*n*/ /*o*/return/*p*/ 1; };
+
+goTo.select("a", "b");
+verify.not.refactorAvailable("Add or remove braces in an arrow function", "Remove braces from arrow function")
+
+goTo.select("c", "d");
+verify.refactorAvailable("Add or remove braces in an arrow function", "Remove braces from arrow function")
+
+goTo.select("e", "f");
+verify.refactorAvailable("Add or remove braces in an arrow function", "Remove braces from arrow function")
+
+goTo.select("g", "h");
+verify.refactorAvailable("Add or remove braces in an arrow function", "Remove braces from arrow function")
+
+goTo.select("i", "j");
+verify.refactorAvailable("Add or remove braces in an arrow function", "Remove braces from arrow function")
+
+goTo.select("k", "l");
+verify.refactorAvailable("Add or remove braces in an arrow function", "Remove braces from arrow function")
+
+goTo.select("m", "n");
+verify.not.refactorAvailable("Add or remove braces in an arrow function", "Remove braces from arrow function")
+
+goTo.select("o", "p");
+verify.not.refactorAvailable("Add or remove braces in an arrow function", "Remove braces from arrow function")
diff --git a/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction23.ts b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction23.ts
new file mode 100644
index 00000000000..4c39ddbd306
--- /dev/null
+++ b/tests/cases/fourslash/refactorAddOrRemoveBracesToArrowFunction23.ts
@@ -0,0 +1,18 @@
+/// <reference path='fourslash.ts' />
+
+//// const /*a*/foo/*b*/ = /*c*/()/*d*/ /*e*//*f*/ /*g*/=>/*h*/ /*i*/1/*j*/;
+
+goTo.select("a", "b");
+verify.not.refactorAvailable("Add or remove braces in an arrow function", "Add braces to arrow function")
+
+goTo.select("c", "d");
+verify.refactorAvailable("Add or remove braces in an arrow function", "Add braces to arrow function")
+
+goTo.select("e", "f");
+verify.refactorAvailable("Add or remove braces in an arrow function", "Add braces to arrow function")
+
+goTo.select("g", "h");
+verify.refactorAvailable("Add or remove braces in an arrow function", "Add braces to arrow function")
+
+goTo.select("i", "j");
+verify.not.refactorAvailable("Add or remove braces in an arrow function", "Add braces to arrow function")

From 9767fbba092a3fa9fa5c7e6a6d4908c30c4c1565 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E7=8E=8B=E6=96=87=E7=92=90?= <kingwenlu@gmail.com>
Date: Mon, 4 Jun 2018 15:16:59 +0800
Subject: [PATCH 12/37] allow access protected member in this parameter context

---
 src/compiler/checker.ts                       |  13 +-
 .../thisTypeAccessibility.errors.txt          |  44 ++++++
 .../reference/thisTypeAccessibility.js        |  59 ++++++++
 .../reference/thisTypeAccessibility.symbols   | 125 +++++++++++++++
 .../reference/thisTypeAccessibility.types     | 142 ++++++++++++++++++
 .../types/thisType/thisTypeAccessibility.ts   |  31 ++++
 6 files changed, 411 insertions(+), 3 deletions(-)
 create mode 100644 tests/baselines/reference/thisTypeAccessibility.errors.txt
 create mode 100644 tests/baselines/reference/thisTypeAccessibility.js
 create mode 100644 tests/baselines/reference/thisTypeAccessibility.symbols
 create mode 100644 tests/baselines/reference/thisTypeAccessibility.types
 create mode 100644 tests/cases/conformance/types/thisType/thisTypeAccessibility.ts

diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 9306907b418..a9243186802 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -17101,14 +17101,21 @@ namespace ts {
 
             // Find the first enclosing class that has the declaring classes of the protected constituents
             // of the property as base classes
-            const enclosingClass = forEachEnclosingClass(node, enclosingDeclaration => {
+            let enclosingClass = forEachEnclosingClass(node, enclosingDeclaration => {
                 const enclosingClass = <InterfaceType>getDeclaredTypeOfSymbol(getSymbolOfNode(enclosingDeclaration)!);
                 return isClassDerivedFromDeclaringClasses(enclosingClass, prop) ? enclosingClass : undefined;
             });
             // A protected property is accessible if the property is within the declaring class or classes derived from it
             if (!enclosingClass) {
-                error(errorNode, Diagnostics.Property_0_is_protected_and_only_accessible_within_class_1_and_its_subclasses, symbolToString(prop), typeToString(getDeclaringClass(prop) || type));
-                return false;
+                let thisParameter: ParameterDeclaration | undefined;
+                const thisContainer = getThisContainer(node, /* includeArrowFunctions */ false);
+                if (!thisContainer || !isFunctionLike(thisContainer) || !(thisParameter = getThisParameter(thisContainer)) || !thisParameter.type) {
+                    error(errorNode, Diagnostics.Property_0_is_protected_and_only_accessible_within_class_1_and_its_subclasses, symbolToString(prop), typeToString(getDeclaringClass(prop) || type));
+                    return false;
+                }
+
+                const thisType = getTypeFromTypeNode(thisParameter.type);
+                enclosingClass = ((thisType.flags & TypeFlags.TypeParameter) ? getConstraintFromTypeParameter(<TypeParameter>thisType) : thisType) as InterfaceType;
             }
             // No further restrictions for static properties
             if (flags & ModifierFlags.Static) {
diff --git a/tests/baselines/reference/thisTypeAccessibility.errors.txt b/tests/baselines/reference/thisTypeAccessibility.errors.txt
new file mode 100644
index 00000000000..bfdc297fa83
--- /dev/null
+++ b/tests/baselines/reference/thisTypeAccessibility.errors.txt
@@ -0,0 +1,44 @@
+tests/cases/conformance/types/thisType/thisTypeAccessibility.ts(14,10): error TS2341: Property 'p' is private and only accessible within class 'MyClass'.
+tests/cases/conformance/types/thisType/thisTypeAccessibility.ts(20,10): error TS2341: Property 'p' is private and only accessible within class 'MyClass'.
+tests/cases/conformance/types/thisType/thisTypeAccessibility.ts(26,10): error TS2341: Property 'p' is private and only accessible within class 'MyClass'.
+
+
+==== tests/cases/conformance/types/thisType/thisTypeAccessibility.ts (3 errors) ====
+    class MyClass {
+        private p: number = 123;
+        protected pp: number = 123;
+        public ppp: number = 123;
+    }
+    
+    interface MyClass {
+        extension1(p: number): void;
+        extension2(p: number): void;
+        extension3(p: number): void;
+    }
+    
+    MyClass.prototype.extension1 = function (this: MyClass, p: number) { 
+        this.p = p;
+             ~
+!!! error TS2341: Property 'p' is private and only accessible within class 'MyClass'.
+        this.pp = p;
+        this.ppp = p;
+    }
+    
+    MyClass.prototype.extension2 = function<T extends MyClass> (this: T, p: number) { 
+        this.p = p;
+             ~
+!!! error TS2341: Property 'p' is private and only accessible within class 'MyClass'.
+        this.pp = p;
+        this.ppp = p;
+    }
+    
+    function extension3<T extends MyClass> (this: T, p: number) { 
+        this.p = p;
+             ~
+!!! error TS2341: Property 'p' is private and only accessible within class 'MyClass'.
+        this.pp = p;
+        this.ppp = p;
+    }
+    
+    MyClass.prototype.extension3 = extension3;
+    
\ No newline at end of file
diff --git a/tests/baselines/reference/thisTypeAccessibility.js b/tests/baselines/reference/thisTypeAccessibility.js
new file mode 100644
index 00000000000..a2695d1d670
--- /dev/null
+++ b/tests/baselines/reference/thisTypeAccessibility.js
@@ -0,0 +1,59 @@
+//// [thisTypeAccessibility.ts]
+class MyClass {
+    private p: number = 123;
+    protected pp: number = 123;
+    public ppp: number = 123;
+}
+
+interface MyClass {
+    extension1(p: number): void;
+    extension2(p: number): void;
+    extension3(p: number): void;
+}
+
+MyClass.prototype.extension1 = function (this: MyClass, p: number) { 
+    this.p = p;
+    this.pp = p;
+    this.ppp = p;
+}
+
+MyClass.prototype.extension2 = function<T extends MyClass> (this: T, p: number) { 
+    this.p = p;
+    this.pp = p;
+    this.ppp = p;
+}
+
+function extension3<T extends MyClass> (this: T, p: number) { 
+    this.p = p;
+    this.pp = p;
+    this.ppp = p;
+}
+
+MyClass.prototype.extension3 = extension3;
+
+
+//// [thisTypeAccessibility.js]
+var MyClass = /** @class */ (function () {
+    function MyClass() {
+        this.p = 123;
+        this.pp = 123;
+        this.ppp = 123;
+    }
+    return MyClass;
+}());
+MyClass.prototype.extension1 = function (p) {
+    this.p = p;
+    this.pp = p;
+    this.ppp = p;
+};
+MyClass.prototype.extension2 = function (p) {
+    this.p = p;
+    this.pp = p;
+    this.ppp = p;
+};
+function extension3(p) {
+    this.p = p;
+    this.pp = p;
+    this.ppp = p;
+}
+MyClass.prototype.extension3 = extension3;
diff --git a/tests/baselines/reference/thisTypeAccessibility.symbols b/tests/baselines/reference/thisTypeAccessibility.symbols
new file mode 100644
index 00000000000..0919d83f8e4
--- /dev/null
+++ b/tests/baselines/reference/thisTypeAccessibility.symbols
@@ -0,0 +1,125 @@
+=== tests/cases/conformance/types/thisType/thisTypeAccessibility.ts ===
+class MyClass {
+>MyClass : Symbol(MyClass, Decl(thisTypeAccessibility.ts, 0, 0), Decl(thisTypeAccessibility.ts, 4, 1))
+
+    private p: number = 123;
+>p : Symbol(MyClass.p, Decl(thisTypeAccessibility.ts, 0, 15))
+
+    protected pp: number = 123;
+>pp : Symbol(MyClass.pp, Decl(thisTypeAccessibility.ts, 1, 28))
+
+    public ppp: number = 123;
+>ppp : Symbol(MyClass.ppp, Decl(thisTypeAccessibility.ts, 2, 31))
+}
+
+interface MyClass {
+>MyClass : Symbol(MyClass, Decl(thisTypeAccessibility.ts, 0, 0), Decl(thisTypeAccessibility.ts, 4, 1))
+
+    extension1(p: number): void;
+>extension1 : Symbol(MyClass.extension1, Decl(thisTypeAccessibility.ts, 6, 19))
+>p : Symbol(p, Decl(thisTypeAccessibility.ts, 7, 15))
+
+    extension2(p: number): void;
+>extension2 : Symbol(MyClass.extension2, Decl(thisTypeAccessibility.ts, 7, 32))
+>p : Symbol(p, Decl(thisTypeAccessibility.ts, 8, 15))
+
+    extension3(p: number): void;
+>extension3 : Symbol(MyClass.extension3, Decl(thisTypeAccessibility.ts, 8, 32))
+>p : Symbol(p, Decl(thisTypeAccessibility.ts, 9, 15))
+}
+
+MyClass.prototype.extension1 = function (this: MyClass, p: number) { 
+>MyClass.prototype.extension1 : Symbol(MyClass.extension1, Decl(thisTypeAccessibility.ts, 6, 19))
+>MyClass.prototype : Symbol(MyClass.prototype)
+>MyClass : Symbol(MyClass, Decl(thisTypeAccessibility.ts, 0, 0), Decl(thisTypeAccessibility.ts, 4, 1))
+>prototype : Symbol(MyClass.prototype)
+>extension1 : Symbol(MyClass.extension1, Decl(thisTypeAccessibility.ts, 6, 19))
+>this : Symbol(this, Decl(thisTypeAccessibility.ts, 12, 41))
+>MyClass : Symbol(MyClass, Decl(thisTypeAccessibility.ts, 0, 0), Decl(thisTypeAccessibility.ts, 4, 1))
+>p : Symbol(p, Decl(thisTypeAccessibility.ts, 12, 55))
+
+    this.p = p;
+>this.p : Symbol(MyClass.p, Decl(thisTypeAccessibility.ts, 0, 15))
+>this : Symbol(this, Decl(thisTypeAccessibility.ts, 12, 41))
+>p : Symbol(MyClass.p, Decl(thisTypeAccessibility.ts, 0, 15))
+>p : Symbol(p, Decl(thisTypeAccessibility.ts, 12, 55))
+
+    this.pp = p;
+>this.pp : Symbol(MyClass.pp, Decl(thisTypeAccessibility.ts, 1, 28))
+>this : Symbol(this, Decl(thisTypeAccessibility.ts, 12, 41))
+>pp : Symbol(MyClass.pp, Decl(thisTypeAccessibility.ts, 1, 28))
+>p : Symbol(p, Decl(thisTypeAccessibility.ts, 12, 55))
+
+    this.ppp = p;
+>this.ppp : Symbol(MyClass.ppp, Decl(thisTypeAccessibility.ts, 2, 31))
+>this : Symbol(this, Decl(thisTypeAccessibility.ts, 12, 41))
+>ppp : Symbol(MyClass.ppp, Decl(thisTypeAccessibility.ts, 2, 31))
+>p : Symbol(p, Decl(thisTypeAccessibility.ts, 12, 55))
+}
+
+MyClass.prototype.extension2 = function<T extends MyClass> (this: T, p: number) { 
+>MyClass.prototype.extension2 : Symbol(MyClass.extension2, Decl(thisTypeAccessibility.ts, 7, 32))
+>MyClass.prototype : Symbol(MyClass.prototype)
+>MyClass : Symbol(MyClass, Decl(thisTypeAccessibility.ts, 0, 0), Decl(thisTypeAccessibility.ts, 4, 1))
+>prototype : Symbol(MyClass.prototype)
+>extension2 : Symbol(MyClass.extension2, Decl(thisTypeAccessibility.ts, 7, 32))
+>T : Symbol(T, Decl(thisTypeAccessibility.ts, 18, 40))
+>MyClass : Symbol(MyClass, Decl(thisTypeAccessibility.ts, 0, 0), Decl(thisTypeAccessibility.ts, 4, 1))
+>this : Symbol(this, Decl(thisTypeAccessibility.ts, 18, 60))
+>T : Symbol(T, Decl(thisTypeAccessibility.ts, 18, 40))
+>p : Symbol(p, Decl(thisTypeAccessibility.ts, 18, 68))
+
+    this.p = p;
+>this.p : Symbol(MyClass.p, Decl(thisTypeAccessibility.ts, 0, 15))
+>this : Symbol(this, Decl(thisTypeAccessibility.ts, 18, 60))
+>p : Symbol(MyClass.p, Decl(thisTypeAccessibility.ts, 0, 15))
+>p : Symbol(p, Decl(thisTypeAccessibility.ts, 18, 68))
+
+    this.pp = p;
+>this.pp : Symbol(MyClass.pp, Decl(thisTypeAccessibility.ts, 1, 28))
+>this : Symbol(this, Decl(thisTypeAccessibility.ts, 18, 60))
+>pp : Symbol(MyClass.pp, Decl(thisTypeAccessibility.ts, 1, 28))
+>p : Symbol(p, Decl(thisTypeAccessibility.ts, 18, 68))
+
+    this.ppp = p;
+>this.ppp : Symbol(MyClass.ppp, Decl(thisTypeAccessibility.ts, 2, 31))
+>this : Symbol(this, Decl(thisTypeAccessibility.ts, 18, 60))
+>ppp : Symbol(MyClass.ppp, Decl(thisTypeAccessibility.ts, 2, 31))
+>p : Symbol(p, Decl(thisTypeAccessibility.ts, 18, 68))
+}
+
+function extension3<T extends MyClass> (this: T, p: number) { 
+>extension3 : Symbol(extension3, Decl(thisTypeAccessibility.ts, 22, 1))
+>T : Symbol(T, Decl(thisTypeAccessibility.ts, 24, 20))
+>MyClass : Symbol(MyClass, Decl(thisTypeAccessibility.ts, 0, 0), Decl(thisTypeAccessibility.ts, 4, 1))
+>this : Symbol(this, Decl(thisTypeAccessibility.ts, 24, 40))
+>T : Symbol(T, Decl(thisTypeAccessibility.ts, 24, 20))
+>p : Symbol(p, Decl(thisTypeAccessibility.ts, 24, 48))
+
+    this.p = p;
+>this.p : Symbol(MyClass.p, Decl(thisTypeAccessibility.ts, 0, 15))
+>this : Symbol(this, Decl(thisTypeAccessibility.ts, 24, 40))
+>p : Symbol(MyClass.p, Decl(thisTypeAccessibility.ts, 0, 15))
+>p : Symbol(p, Decl(thisTypeAccessibility.ts, 24, 48))
+
+    this.pp = p;
+>this.pp : Symbol(MyClass.pp, Decl(thisTypeAccessibility.ts, 1, 28))
+>this : Symbol(this, Decl(thisTypeAccessibility.ts, 24, 40))
+>pp : Symbol(MyClass.pp, Decl(thisTypeAccessibility.ts, 1, 28))
+>p : Symbol(p, Decl(thisTypeAccessibility.ts, 24, 48))
+
+    this.ppp = p;
+>this.ppp : Symbol(MyClass.ppp, Decl(thisTypeAccessibility.ts, 2, 31))
+>this : Symbol(this, Decl(thisTypeAccessibility.ts, 24, 40))
+>ppp : Symbol(MyClass.ppp, Decl(thisTypeAccessibility.ts, 2, 31))
+>p : Symbol(p, Decl(thisTypeAccessibility.ts, 24, 48))
+}
+
+MyClass.prototype.extension3 = extension3;
+>MyClass.prototype.extension3 : Symbol(MyClass.extension3, Decl(thisTypeAccessibility.ts, 8, 32))
+>MyClass.prototype : Symbol(MyClass.prototype)
+>MyClass : Symbol(MyClass, Decl(thisTypeAccessibility.ts, 0, 0), Decl(thisTypeAccessibility.ts, 4, 1))
+>prototype : Symbol(MyClass.prototype)
+>extension3 : Symbol(MyClass.extension3, Decl(thisTypeAccessibility.ts, 8, 32))
+>extension3 : Symbol(extension3, Decl(thisTypeAccessibility.ts, 22, 1))
+
diff --git a/tests/baselines/reference/thisTypeAccessibility.types b/tests/baselines/reference/thisTypeAccessibility.types
new file mode 100644
index 00000000000..3eb0f46f1b7
--- /dev/null
+++ b/tests/baselines/reference/thisTypeAccessibility.types
@@ -0,0 +1,142 @@
+=== tests/cases/conformance/types/thisType/thisTypeAccessibility.ts ===
+class MyClass {
+>MyClass : MyClass
+
+    private p: number = 123;
+>p : number
+>123 : 123
+
+    protected pp: number = 123;
+>pp : number
+>123 : 123
+
+    public ppp: number = 123;
+>ppp : number
+>123 : 123
+}
+
+interface MyClass {
+>MyClass : MyClass
+
+    extension1(p: number): void;
+>extension1 : (p: number) => void
+>p : number
+
+    extension2(p: number): void;
+>extension2 : (p: number) => void
+>p : number
+
+    extension3(p: number): void;
+>extension3 : (p: number) => void
+>p : number
+}
+
+MyClass.prototype.extension1 = function (this: MyClass, p: number) { 
+>MyClass.prototype.extension1 = function (this: MyClass, p: number) {     this.p = p;    this.pp = p;    this.ppp = p;} : (this: MyClass, p: number) => void
+>MyClass.prototype.extension1 : (p: number) => void
+>MyClass.prototype : MyClass
+>MyClass : typeof MyClass
+>prototype : MyClass
+>extension1 : (p: number) => void
+>function (this: MyClass, p: number) {     this.p = p;    this.pp = p;    this.ppp = p;} : (this: MyClass, p: number) => void
+>this : MyClass
+>MyClass : MyClass
+>p : number
+
+    this.p = p;
+>this.p = p : number
+>this.p : number
+>this : MyClass
+>p : number
+>p : number
+
+    this.pp = p;
+>this.pp = p : number
+>this.pp : number
+>this : MyClass
+>pp : number
+>p : number
+
+    this.ppp = p;
+>this.ppp = p : number
+>this.ppp : number
+>this : MyClass
+>ppp : number
+>p : number
+}
+
+MyClass.prototype.extension2 = function<T extends MyClass> (this: T, p: number) { 
+>MyClass.prototype.extension2 = function<T extends MyClass> (this: T, p: number) {     this.p = p;    this.pp = p;    this.ppp = p;} : <T extends MyClass>(this: T, p: number) => void
+>MyClass.prototype.extension2 : (p: number) => void
+>MyClass.prototype : MyClass
+>MyClass : typeof MyClass
+>prototype : MyClass
+>extension2 : (p: number) => void
+>function<T extends MyClass> (this: T, p: number) {     this.p = p;    this.pp = p;    this.ppp = p;} : <T extends MyClass>(this: T, p: number) => void
+>T : T
+>MyClass : MyClass
+>this : T
+>T : T
+>p : number
+
+    this.p = p;
+>this.p = p : number
+>this.p : number
+>this : T
+>p : number
+>p : number
+
+    this.pp = p;
+>this.pp = p : number
+>this.pp : number
+>this : T
+>pp : number
+>p : number
+
+    this.ppp = p;
+>this.ppp = p : number
+>this.ppp : number
+>this : T
+>ppp : number
+>p : number
+}
+
+function extension3<T extends MyClass> (this: T, p: number) { 
+>extension3 : <T extends MyClass>(this: T, p: number) => void
+>T : T
+>MyClass : MyClass
+>this : T
+>T : T
+>p : number
+
+    this.p = p;
+>this.p = p : number
+>this.p : number
+>this : T
+>p : number
+>p : number
+
+    this.pp = p;
+>this.pp = p : number
+>this.pp : number
+>this : T
+>pp : number
+>p : number
+
+    this.ppp = p;
+>this.ppp = p : number
+>this.ppp : number
+>this : T
+>ppp : number
+>p : number
+}
+
+MyClass.prototype.extension3 = extension3;
+>MyClass.prototype.extension3 = extension3 : <T extends MyClass>(this: T, p: number) => void
+>MyClass.prototype.extension3 : (p: number) => void
+>MyClass.prototype : MyClass
+>MyClass : typeof MyClass
+>prototype : MyClass
+>extension3 : (p: number) => void
+>extension3 : <T extends MyClass>(this: T, p: number) => void
+
diff --git a/tests/cases/conformance/types/thisType/thisTypeAccessibility.ts b/tests/cases/conformance/types/thisType/thisTypeAccessibility.ts
new file mode 100644
index 00000000000..28d55222d5a
--- /dev/null
+++ b/tests/cases/conformance/types/thisType/thisTypeAccessibility.ts
@@ -0,0 +1,31 @@
+class MyClass {
+    private p: number = 123;
+    protected pp: number = 123;
+    public ppp: number = 123;
+}
+
+interface MyClass {
+    extension1(p: number): void;
+    extension2(p: number): void;
+    extension3(p: number): void;
+}
+
+MyClass.prototype.extension1 = function (this: MyClass, p: number) { 
+    this.p = p;
+    this.pp = p;
+    this.ppp = p;
+}
+
+MyClass.prototype.extension2 = function<T extends MyClass> (this: T, p: number) { 
+    this.p = p;
+    this.pp = p;
+    this.ppp = p;
+}
+
+function extension3<T extends MyClass> (this: T, p: number) { 
+    this.p = p;
+    this.pp = p;
+    this.ppp = p;
+}
+
+MyClass.prototype.extension3 = extension3;

From 0bcbbbdd582cc44ee0d2a987ced8af1cb0e8349d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E7=8E=8B=E6=96=87=E7=92=90?= <kingwenlu@gmail.com>
Date: Tue, 5 Jun 2018 18:42:21 +0800
Subject: [PATCH 13/37] disallow static field access

---
 src/compiler/checker.ts                       |   4 +-
 .../thisTypeAccessibility.errors.txt          |  36 +++-
 .../reference/thisTypeAccessibility.js        |  24 +++
 .../reference/thisTypeAccessibility.symbols   | 163 ++++++++++++------
 .../reference/thisTypeAccessibility.types     |  83 ++++++++-
 .../types/thisType/thisTypeAccessibility.ts   |  12 ++
 6 files changed, 263 insertions(+), 59 deletions(-)

diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index a9243186802..be8b11bf1f0 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -17109,7 +17109,7 @@ namespace ts {
             if (!enclosingClass) {
                 let thisParameter: ParameterDeclaration | undefined;
                 const thisContainer = getThisContainer(node, /* includeArrowFunctions */ false);
-                if (!thisContainer || !isFunctionLike(thisContainer) || !(thisParameter = getThisParameter(thisContainer)) || !thisParameter.type) {
+                if (flags & ModifierFlags.Static || !thisContainer || !isFunctionLike(thisContainer) || !(thisParameter = getThisParameter(thisContainer)) || !thisParameter.type) {
                     error(errorNode, Diagnostics.Property_0_is_protected_and_only_accessible_within_class_1_and_its_subclasses, symbolToString(prop), typeToString(getDeclaringClass(prop) || type));
                     return false;
                 }
@@ -17121,7 +17121,7 @@ namespace ts {
             if (flags & ModifierFlags.Static) {
                 return true;
             }
-             if (type.flags & TypeFlags.TypeParameter) {
+            if (type.flags & TypeFlags.TypeParameter) {
                 // get the original type -- represented as the type constraint of the 'this' type
                 type = (type as TypeParameter).isThisType ? getConstraintOfTypeParameter(<TypeParameter>type)! : getBaseConstraintOfType(<TypeParameter>type)!; // TODO: GH#18217 Use a different variable that's allowed to be undefined
             }
diff --git a/tests/baselines/reference/thisTypeAccessibility.errors.txt b/tests/baselines/reference/thisTypeAccessibility.errors.txt
index bfdc297fa83..915d6f20b82 100644
--- a/tests/baselines/reference/thisTypeAccessibility.errors.txt
+++ b/tests/baselines/reference/thisTypeAccessibility.errors.txt
@@ -1,13 +1,22 @@
-tests/cases/conformance/types/thisType/thisTypeAccessibility.ts(14,10): error TS2341: Property 'p' is private and only accessible within class 'MyClass'.
-tests/cases/conformance/types/thisType/thisTypeAccessibility.ts(20,10): error TS2341: Property 'p' is private and only accessible within class 'MyClass'.
+tests/cases/conformance/types/thisType/thisTypeAccessibility.ts(17,10): error TS2341: Property 'p' is private and only accessible within class 'MyClass'.
+tests/cases/conformance/types/thisType/thisTypeAccessibility.ts(20,13): error TS2341: Property 'sp' is private and only accessible within class 'MyClass'.
+tests/cases/conformance/types/thisType/thisTypeAccessibility.ts(21,13): error TS2445: Property 'spp' is protected and only accessible within class 'MyClass' and its subclasses.
 tests/cases/conformance/types/thisType/thisTypeAccessibility.ts(26,10): error TS2341: Property 'p' is private and only accessible within class 'MyClass'.
+tests/cases/conformance/types/thisType/thisTypeAccessibility.ts(29,13): error TS2341: Property 'sp' is private and only accessible within class 'MyClass'.
+tests/cases/conformance/types/thisType/thisTypeAccessibility.ts(30,13): error TS2445: Property 'spp' is protected and only accessible within class 'MyClass' and its subclasses.
+tests/cases/conformance/types/thisType/thisTypeAccessibility.ts(35,10): error TS2341: Property 'p' is private and only accessible within class 'MyClass'.
+tests/cases/conformance/types/thisType/thisTypeAccessibility.ts(38,13): error TS2341: Property 'sp' is private and only accessible within class 'MyClass'.
+tests/cases/conformance/types/thisType/thisTypeAccessibility.ts(39,13): error TS2445: Property 'spp' is protected and only accessible within class 'MyClass' and its subclasses.
 
 
-==== tests/cases/conformance/types/thisType/thisTypeAccessibility.ts (3 errors) ====
+==== tests/cases/conformance/types/thisType/thisTypeAccessibility.ts (9 errors) ====
     class MyClass {
         private p: number = 123;
         protected pp: number = 123;
         public ppp: number = 123;
+        private static sp: number = 123;
+        protected static spp: number = 123;
+        public static sppp: number = 123;
     }
     
     interface MyClass {
@@ -22,6 +31,13 @@ tests/cases/conformance/types/thisType/thisTypeAccessibility.ts(26,10): error TS
 !!! error TS2341: Property 'p' is private and only accessible within class 'MyClass'.
         this.pp = p;
         this.ppp = p;
+        MyClass.sp = p;
+                ~~
+!!! error TS2341: Property 'sp' is private and only accessible within class 'MyClass'.
+        MyClass.spp = p;
+                ~~~
+!!! error TS2445: Property 'spp' is protected and only accessible within class 'MyClass' and its subclasses.
+        MyClass.sppp = p;
     }
     
     MyClass.prototype.extension2 = function<T extends MyClass> (this: T, p: number) { 
@@ -30,6 +46,13 @@ tests/cases/conformance/types/thisType/thisTypeAccessibility.ts(26,10): error TS
 !!! error TS2341: Property 'p' is private and only accessible within class 'MyClass'.
         this.pp = p;
         this.ppp = p;
+        MyClass.sp = p;
+                ~~
+!!! error TS2341: Property 'sp' is private and only accessible within class 'MyClass'.
+        MyClass.spp = p;
+                ~~~
+!!! error TS2445: Property 'spp' is protected and only accessible within class 'MyClass' and its subclasses.
+        MyClass.sppp = p;
     }
     
     function extension3<T extends MyClass> (this: T, p: number) { 
@@ -38,6 +61,13 @@ tests/cases/conformance/types/thisType/thisTypeAccessibility.ts(26,10): error TS
 !!! error TS2341: Property 'p' is private and only accessible within class 'MyClass'.
         this.pp = p;
         this.ppp = p;
+        MyClass.sp = p;
+                ~~
+!!! error TS2341: Property 'sp' is private and only accessible within class 'MyClass'.
+        MyClass.spp = p;
+                ~~~
+!!! error TS2445: Property 'spp' is protected and only accessible within class 'MyClass' and its subclasses.
+        MyClass.sppp = p;
     }
     
     MyClass.prototype.extension3 = extension3;
diff --git a/tests/baselines/reference/thisTypeAccessibility.js b/tests/baselines/reference/thisTypeAccessibility.js
index a2695d1d670..04340cebcd3 100644
--- a/tests/baselines/reference/thisTypeAccessibility.js
+++ b/tests/baselines/reference/thisTypeAccessibility.js
@@ -3,6 +3,9 @@ class MyClass {
     private p: number = 123;
     protected pp: number = 123;
     public ppp: number = 123;
+    private static sp: number = 123;
+    protected static spp: number = 123;
+    public static sppp: number = 123;
 }
 
 interface MyClass {
@@ -15,18 +18,27 @@ MyClass.prototype.extension1 = function (this: MyClass, p: number) {
     this.p = p;
     this.pp = p;
     this.ppp = p;
+    MyClass.sp = p;
+    MyClass.spp = p;
+    MyClass.sppp = p;
 }
 
 MyClass.prototype.extension2 = function<T extends MyClass> (this: T, p: number) { 
     this.p = p;
     this.pp = p;
     this.ppp = p;
+    MyClass.sp = p;
+    MyClass.spp = p;
+    MyClass.sppp = p;
 }
 
 function extension3<T extends MyClass> (this: T, p: number) { 
     this.p = p;
     this.pp = p;
     this.ppp = p;
+    MyClass.sp = p;
+    MyClass.spp = p;
+    MyClass.sppp = p;
 }
 
 MyClass.prototype.extension3 = extension3;
@@ -39,21 +51,33 @@ var MyClass = /** @class */ (function () {
         this.pp = 123;
         this.ppp = 123;
     }
+    MyClass.sp = 123;
+    MyClass.spp = 123;
+    MyClass.sppp = 123;
     return MyClass;
 }());
 MyClass.prototype.extension1 = function (p) {
     this.p = p;
     this.pp = p;
     this.ppp = p;
+    MyClass.sp = p;
+    MyClass.spp = p;
+    MyClass.sppp = p;
 };
 MyClass.prototype.extension2 = function (p) {
     this.p = p;
     this.pp = p;
     this.ppp = p;
+    MyClass.sp = p;
+    MyClass.spp = p;
+    MyClass.sppp = p;
 };
 function extension3(p) {
     this.p = p;
     this.pp = p;
     this.ppp = p;
+    MyClass.sp = p;
+    MyClass.spp = p;
+    MyClass.sppp = p;
 }
 MyClass.prototype.extension3 = extension3;
diff --git a/tests/baselines/reference/thisTypeAccessibility.symbols b/tests/baselines/reference/thisTypeAccessibility.symbols
index 0919d83f8e4..bbb62fa57bc 100644
--- a/tests/baselines/reference/thisTypeAccessibility.symbols
+++ b/tests/baselines/reference/thisTypeAccessibility.symbols
@@ -1,6 +1,6 @@
 === tests/cases/conformance/types/thisType/thisTypeAccessibility.ts ===
 class MyClass {
->MyClass : Symbol(MyClass, Decl(thisTypeAccessibility.ts, 0, 0), Decl(thisTypeAccessibility.ts, 4, 1))
+>MyClass : Symbol(MyClass, Decl(thisTypeAccessibility.ts, 0, 0), Decl(thisTypeAccessibility.ts, 7, 1))
 
     private p: number = 123;
 >p : Symbol(MyClass.p, Decl(thisTypeAccessibility.ts, 0, 15))
@@ -10,116 +10,179 @@ class MyClass {
 
     public ppp: number = 123;
 >ppp : Symbol(MyClass.ppp, Decl(thisTypeAccessibility.ts, 2, 31))
+
+    private static sp: number = 123;
+>sp : Symbol(MyClass.sp, Decl(thisTypeAccessibility.ts, 3, 29))
+
+    protected static spp: number = 123;
+>spp : Symbol(MyClass.spp, Decl(thisTypeAccessibility.ts, 4, 36))
+
+    public static sppp: number = 123;
+>sppp : Symbol(MyClass.sppp, Decl(thisTypeAccessibility.ts, 5, 39))
 }
 
 interface MyClass {
->MyClass : Symbol(MyClass, Decl(thisTypeAccessibility.ts, 0, 0), Decl(thisTypeAccessibility.ts, 4, 1))
+>MyClass : Symbol(MyClass, Decl(thisTypeAccessibility.ts, 0, 0), Decl(thisTypeAccessibility.ts, 7, 1))
 
     extension1(p: number): void;
->extension1 : Symbol(MyClass.extension1, Decl(thisTypeAccessibility.ts, 6, 19))
->p : Symbol(p, Decl(thisTypeAccessibility.ts, 7, 15))
+>extension1 : Symbol(MyClass.extension1, Decl(thisTypeAccessibility.ts, 9, 19))
+>p : Symbol(p, Decl(thisTypeAccessibility.ts, 10, 15))
 
     extension2(p: number): void;
->extension2 : Symbol(MyClass.extension2, Decl(thisTypeAccessibility.ts, 7, 32))
->p : Symbol(p, Decl(thisTypeAccessibility.ts, 8, 15))
+>extension2 : Symbol(MyClass.extension2, Decl(thisTypeAccessibility.ts, 10, 32))
+>p : Symbol(p, Decl(thisTypeAccessibility.ts, 11, 15))
 
     extension3(p: number): void;
->extension3 : Symbol(MyClass.extension3, Decl(thisTypeAccessibility.ts, 8, 32))
->p : Symbol(p, Decl(thisTypeAccessibility.ts, 9, 15))
+>extension3 : Symbol(MyClass.extension3, Decl(thisTypeAccessibility.ts, 11, 32))
+>p : Symbol(p, Decl(thisTypeAccessibility.ts, 12, 15))
 }
 
 MyClass.prototype.extension1 = function (this: MyClass, p: number) { 
->MyClass.prototype.extension1 : Symbol(MyClass.extension1, Decl(thisTypeAccessibility.ts, 6, 19))
+>MyClass.prototype.extension1 : Symbol(MyClass.extension1, Decl(thisTypeAccessibility.ts, 9, 19))
 >MyClass.prototype : Symbol(MyClass.prototype)
->MyClass : Symbol(MyClass, Decl(thisTypeAccessibility.ts, 0, 0), Decl(thisTypeAccessibility.ts, 4, 1))
+>MyClass : Symbol(MyClass, Decl(thisTypeAccessibility.ts, 0, 0), Decl(thisTypeAccessibility.ts, 7, 1))
 >prototype : Symbol(MyClass.prototype)
->extension1 : Symbol(MyClass.extension1, Decl(thisTypeAccessibility.ts, 6, 19))
->this : Symbol(this, Decl(thisTypeAccessibility.ts, 12, 41))
->MyClass : Symbol(MyClass, Decl(thisTypeAccessibility.ts, 0, 0), Decl(thisTypeAccessibility.ts, 4, 1))
->p : Symbol(p, Decl(thisTypeAccessibility.ts, 12, 55))
+>extension1 : Symbol(MyClass.extension1, Decl(thisTypeAccessibility.ts, 9, 19))
+>this : Symbol(this, Decl(thisTypeAccessibility.ts, 15, 41))
+>MyClass : Symbol(MyClass, Decl(thisTypeAccessibility.ts, 0, 0), Decl(thisTypeAccessibility.ts, 7, 1))
+>p : Symbol(p, Decl(thisTypeAccessibility.ts, 15, 55))
 
     this.p = p;
 >this.p : Symbol(MyClass.p, Decl(thisTypeAccessibility.ts, 0, 15))
->this : Symbol(this, Decl(thisTypeAccessibility.ts, 12, 41))
+>this : Symbol(this, Decl(thisTypeAccessibility.ts, 15, 41))
 >p : Symbol(MyClass.p, Decl(thisTypeAccessibility.ts, 0, 15))
->p : Symbol(p, Decl(thisTypeAccessibility.ts, 12, 55))
+>p : Symbol(p, Decl(thisTypeAccessibility.ts, 15, 55))
 
     this.pp = p;
 >this.pp : Symbol(MyClass.pp, Decl(thisTypeAccessibility.ts, 1, 28))
->this : Symbol(this, Decl(thisTypeAccessibility.ts, 12, 41))
+>this : Symbol(this, Decl(thisTypeAccessibility.ts, 15, 41))
 >pp : Symbol(MyClass.pp, Decl(thisTypeAccessibility.ts, 1, 28))
->p : Symbol(p, Decl(thisTypeAccessibility.ts, 12, 55))
+>p : Symbol(p, Decl(thisTypeAccessibility.ts, 15, 55))
 
     this.ppp = p;
 >this.ppp : Symbol(MyClass.ppp, Decl(thisTypeAccessibility.ts, 2, 31))
->this : Symbol(this, Decl(thisTypeAccessibility.ts, 12, 41))
+>this : Symbol(this, Decl(thisTypeAccessibility.ts, 15, 41))
 >ppp : Symbol(MyClass.ppp, Decl(thisTypeAccessibility.ts, 2, 31))
->p : Symbol(p, Decl(thisTypeAccessibility.ts, 12, 55))
+>p : Symbol(p, Decl(thisTypeAccessibility.ts, 15, 55))
+
+    MyClass.sp = p;
+>MyClass.sp : Symbol(MyClass.sp, Decl(thisTypeAccessibility.ts, 3, 29))
+>MyClass : Symbol(MyClass, Decl(thisTypeAccessibility.ts, 0, 0), Decl(thisTypeAccessibility.ts, 7, 1))
+>sp : Symbol(MyClass.sp, Decl(thisTypeAccessibility.ts, 3, 29))
+>p : Symbol(p, Decl(thisTypeAccessibility.ts, 15, 55))
+
+    MyClass.spp = p;
+>MyClass.spp : Symbol(MyClass.spp, Decl(thisTypeAccessibility.ts, 4, 36))
+>MyClass : Symbol(MyClass, Decl(thisTypeAccessibility.ts, 0, 0), Decl(thisTypeAccessibility.ts, 7, 1))
+>spp : Symbol(MyClass.spp, Decl(thisTypeAccessibility.ts, 4, 36))
+>p : Symbol(p, Decl(thisTypeAccessibility.ts, 15, 55))
+
+    MyClass.sppp = p;
+>MyClass.sppp : Symbol(MyClass.sppp, Decl(thisTypeAccessibility.ts, 5, 39))
+>MyClass : Symbol(MyClass, Decl(thisTypeAccessibility.ts, 0, 0), Decl(thisTypeAccessibility.ts, 7, 1))
+>sppp : Symbol(MyClass.sppp, Decl(thisTypeAccessibility.ts, 5, 39))
+>p : Symbol(p, Decl(thisTypeAccessibility.ts, 15, 55))
 }
 
 MyClass.prototype.extension2 = function<T extends MyClass> (this: T, p: number) { 
->MyClass.prototype.extension2 : Symbol(MyClass.extension2, Decl(thisTypeAccessibility.ts, 7, 32))
+>MyClass.prototype.extension2 : Symbol(MyClass.extension2, Decl(thisTypeAccessibility.ts, 10, 32))
 >MyClass.prototype : Symbol(MyClass.prototype)
->MyClass : Symbol(MyClass, Decl(thisTypeAccessibility.ts, 0, 0), Decl(thisTypeAccessibility.ts, 4, 1))
+>MyClass : Symbol(MyClass, Decl(thisTypeAccessibility.ts, 0, 0), Decl(thisTypeAccessibility.ts, 7, 1))
 >prototype : Symbol(MyClass.prototype)
->extension2 : Symbol(MyClass.extension2, Decl(thisTypeAccessibility.ts, 7, 32))
->T : Symbol(T, Decl(thisTypeAccessibility.ts, 18, 40))
->MyClass : Symbol(MyClass, Decl(thisTypeAccessibility.ts, 0, 0), Decl(thisTypeAccessibility.ts, 4, 1))
->this : Symbol(this, Decl(thisTypeAccessibility.ts, 18, 60))
->T : Symbol(T, Decl(thisTypeAccessibility.ts, 18, 40))
->p : Symbol(p, Decl(thisTypeAccessibility.ts, 18, 68))
+>extension2 : Symbol(MyClass.extension2, Decl(thisTypeAccessibility.ts, 10, 32))
+>T : Symbol(T, Decl(thisTypeAccessibility.ts, 24, 40))
+>MyClass : Symbol(MyClass, Decl(thisTypeAccessibility.ts, 0, 0), Decl(thisTypeAccessibility.ts, 7, 1))
+>this : Symbol(this, Decl(thisTypeAccessibility.ts, 24, 60))
+>T : Symbol(T, Decl(thisTypeAccessibility.ts, 24, 40))
+>p : Symbol(p, Decl(thisTypeAccessibility.ts, 24, 68))
 
     this.p = p;
 >this.p : Symbol(MyClass.p, Decl(thisTypeAccessibility.ts, 0, 15))
->this : Symbol(this, Decl(thisTypeAccessibility.ts, 18, 60))
+>this : Symbol(this, Decl(thisTypeAccessibility.ts, 24, 60))
 >p : Symbol(MyClass.p, Decl(thisTypeAccessibility.ts, 0, 15))
->p : Symbol(p, Decl(thisTypeAccessibility.ts, 18, 68))
+>p : Symbol(p, Decl(thisTypeAccessibility.ts, 24, 68))
 
     this.pp = p;
 >this.pp : Symbol(MyClass.pp, Decl(thisTypeAccessibility.ts, 1, 28))
->this : Symbol(this, Decl(thisTypeAccessibility.ts, 18, 60))
+>this : Symbol(this, Decl(thisTypeAccessibility.ts, 24, 60))
 >pp : Symbol(MyClass.pp, Decl(thisTypeAccessibility.ts, 1, 28))
->p : Symbol(p, Decl(thisTypeAccessibility.ts, 18, 68))
+>p : Symbol(p, Decl(thisTypeAccessibility.ts, 24, 68))
 
     this.ppp = p;
 >this.ppp : Symbol(MyClass.ppp, Decl(thisTypeAccessibility.ts, 2, 31))
->this : Symbol(this, Decl(thisTypeAccessibility.ts, 18, 60))
+>this : Symbol(this, Decl(thisTypeAccessibility.ts, 24, 60))
 >ppp : Symbol(MyClass.ppp, Decl(thisTypeAccessibility.ts, 2, 31))
->p : Symbol(p, Decl(thisTypeAccessibility.ts, 18, 68))
+>p : Symbol(p, Decl(thisTypeAccessibility.ts, 24, 68))
+
+    MyClass.sp = p;
+>MyClass.sp : Symbol(MyClass.sp, Decl(thisTypeAccessibility.ts, 3, 29))
+>MyClass : Symbol(MyClass, Decl(thisTypeAccessibility.ts, 0, 0), Decl(thisTypeAccessibility.ts, 7, 1))
+>sp : Symbol(MyClass.sp, Decl(thisTypeAccessibility.ts, 3, 29))
+>p : Symbol(p, Decl(thisTypeAccessibility.ts, 24, 68))
+
+    MyClass.spp = p;
+>MyClass.spp : Symbol(MyClass.spp, Decl(thisTypeAccessibility.ts, 4, 36))
+>MyClass : Symbol(MyClass, Decl(thisTypeAccessibility.ts, 0, 0), Decl(thisTypeAccessibility.ts, 7, 1))
+>spp : Symbol(MyClass.spp, Decl(thisTypeAccessibility.ts, 4, 36))
+>p : Symbol(p, Decl(thisTypeAccessibility.ts, 24, 68))
+
+    MyClass.sppp = p;
+>MyClass.sppp : Symbol(MyClass.sppp, Decl(thisTypeAccessibility.ts, 5, 39))
+>MyClass : Symbol(MyClass, Decl(thisTypeAccessibility.ts, 0, 0), Decl(thisTypeAccessibility.ts, 7, 1))
+>sppp : Symbol(MyClass.sppp, Decl(thisTypeAccessibility.ts, 5, 39))
+>p : Symbol(p, Decl(thisTypeAccessibility.ts, 24, 68))
 }
 
 function extension3<T extends MyClass> (this: T, p: number) { 
->extension3 : Symbol(extension3, Decl(thisTypeAccessibility.ts, 22, 1))
->T : Symbol(T, Decl(thisTypeAccessibility.ts, 24, 20))
->MyClass : Symbol(MyClass, Decl(thisTypeAccessibility.ts, 0, 0), Decl(thisTypeAccessibility.ts, 4, 1))
->this : Symbol(this, Decl(thisTypeAccessibility.ts, 24, 40))
->T : Symbol(T, Decl(thisTypeAccessibility.ts, 24, 20))
->p : Symbol(p, Decl(thisTypeAccessibility.ts, 24, 48))
+>extension3 : Symbol(extension3, Decl(thisTypeAccessibility.ts, 31, 1))
+>T : Symbol(T, Decl(thisTypeAccessibility.ts, 33, 20))
+>MyClass : Symbol(MyClass, Decl(thisTypeAccessibility.ts, 0, 0), Decl(thisTypeAccessibility.ts, 7, 1))
+>this : Symbol(this, Decl(thisTypeAccessibility.ts, 33, 40))
+>T : Symbol(T, Decl(thisTypeAccessibility.ts, 33, 20))
+>p : Symbol(p, Decl(thisTypeAccessibility.ts, 33, 48))
 
     this.p = p;
 >this.p : Symbol(MyClass.p, Decl(thisTypeAccessibility.ts, 0, 15))
->this : Symbol(this, Decl(thisTypeAccessibility.ts, 24, 40))
+>this : Symbol(this, Decl(thisTypeAccessibility.ts, 33, 40))
 >p : Symbol(MyClass.p, Decl(thisTypeAccessibility.ts, 0, 15))
->p : Symbol(p, Decl(thisTypeAccessibility.ts, 24, 48))
+>p : Symbol(p, Decl(thisTypeAccessibility.ts, 33, 48))
 
     this.pp = p;
 >this.pp : Symbol(MyClass.pp, Decl(thisTypeAccessibility.ts, 1, 28))
->this : Symbol(this, Decl(thisTypeAccessibility.ts, 24, 40))
+>this : Symbol(this, Decl(thisTypeAccessibility.ts, 33, 40))
 >pp : Symbol(MyClass.pp, Decl(thisTypeAccessibility.ts, 1, 28))
->p : Symbol(p, Decl(thisTypeAccessibility.ts, 24, 48))
+>p : Symbol(p, Decl(thisTypeAccessibility.ts, 33, 48))
 
     this.ppp = p;
 >this.ppp : Symbol(MyClass.ppp, Decl(thisTypeAccessibility.ts, 2, 31))
->this : Symbol(this, Decl(thisTypeAccessibility.ts, 24, 40))
+>this : Symbol(this, Decl(thisTypeAccessibility.ts, 33, 40))
 >ppp : Symbol(MyClass.ppp, Decl(thisTypeAccessibility.ts, 2, 31))
->p : Symbol(p, Decl(thisTypeAccessibility.ts, 24, 48))
+>p : Symbol(p, Decl(thisTypeAccessibility.ts, 33, 48))
+
+    MyClass.sp = p;
+>MyClass.sp : Symbol(MyClass.sp, Decl(thisTypeAccessibility.ts, 3, 29))
+>MyClass : Symbol(MyClass, Decl(thisTypeAccessibility.ts, 0, 0), Decl(thisTypeAccessibility.ts, 7, 1))
+>sp : Symbol(MyClass.sp, Decl(thisTypeAccessibility.ts, 3, 29))
+>p : Symbol(p, Decl(thisTypeAccessibility.ts, 33, 48))
+
+    MyClass.spp = p;
+>MyClass.spp : Symbol(MyClass.spp, Decl(thisTypeAccessibility.ts, 4, 36))
+>MyClass : Symbol(MyClass, Decl(thisTypeAccessibility.ts, 0, 0), Decl(thisTypeAccessibility.ts, 7, 1))
+>spp : Symbol(MyClass.spp, Decl(thisTypeAccessibility.ts, 4, 36))
+>p : Symbol(p, Decl(thisTypeAccessibility.ts, 33, 48))
+
+    MyClass.sppp = p;
+>MyClass.sppp : Symbol(MyClass.sppp, Decl(thisTypeAccessibility.ts, 5, 39))
+>MyClass : Symbol(MyClass, Decl(thisTypeAccessibility.ts, 0, 0), Decl(thisTypeAccessibility.ts, 7, 1))
+>sppp : Symbol(MyClass.sppp, Decl(thisTypeAccessibility.ts, 5, 39))
+>p : Symbol(p, Decl(thisTypeAccessibility.ts, 33, 48))
 }
 
 MyClass.prototype.extension3 = extension3;
->MyClass.prototype.extension3 : Symbol(MyClass.extension3, Decl(thisTypeAccessibility.ts, 8, 32))
+>MyClass.prototype.extension3 : Symbol(MyClass.extension3, Decl(thisTypeAccessibility.ts, 11, 32))
 >MyClass.prototype : Symbol(MyClass.prototype)
->MyClass : Symbol(MyClass, Decl(thisTypeAccessibility.ts, 0, 0), Decl(thisTypeAccessibility.ts, 4, 1))
+>MyClass : Symbol(MyClass, Decl(thisTypeAccessibility.ts, 0, 0), Decl(thisTypeAccessibility.ts, 7, 1))
 >prototype : Symbol(MyClass.prototype)
->extension3 : Symbol(MyClass.extension3, Decl(thisTypeAccessibility.ts, 8, 32))
->extension3 : Symbol(extension3, Decl(thisTypeAccessibility.ts, 22, 1))
+>extension3 : Symbol(MyClass.extension3, Decl(thisTypeAccessibility.ts, 11, 32))
+>extension3 : Symbol(extension3, Decl(thisTypeAccessibility.ts, 31, 1))
 
diff --git a/tests/baselines/reference/thisTypeAccessibility.types b/tests/baselines/reference/thisTypeAccessibility.types
index 3eb0f46f1b7..61e9434e4f0 100644
--- a/tests/baselines/reference/thisTypeAccessibility.types
+++ b/tests/baselines/reference/thisTypeAccessibility.types
@@ -12,6 +12,18 @@ class MyClass {
 
     public ppp: number = 123;
 >ppp : number
+>123 : 123
+
+    private static sp: number = 123;
+>sp : number
+>123 : 123
+
+    protected static spp: number = 123;
+>spp : number
+>123 : 123
+
+    public static sppp: number = 123;
+>sppp : number
 >123 : 123
 }
 
@@ -32,13 +44,13 @@ interface MyClass {
 }
 
 MyClass.prototype.extension1 = function (this: MyClass, p: number) { 
->MyClass.prototype.extension1 = function (this: MyClass, p: number) {     this.p = p;    this.pp = p;    this.ppp = p;} : (this: MyClass, p: number) => void
+>MyClass.prototype.extension1 = function (this: MyClass, p: number) {     this.p = p;    this.pp = p;    this.ppp = p;    MyClass.sp = p;    MyClass.spp = p;    MyClass.sppp = p;} : (this: MyClass, p: number) => void
 >MyClass.prototype.extension1 : (p: number) => void
 >MyClass.prototype : MyClass
 >MyClass : typeof MyClass
 >prototype : MyClass
 >extension1 : (p: number) => void
->function (this: MyClass, p: number) {     this.p = p;    this.pp = p;    this.ppp = p;} : (this: MyClass, p: number) => void
+>function (this: MyClass, p: number) {     this.p = p;    this.pp = p;    this.ppp = p;    MyClass.sp = p;    MyClass.spp = p;    MyClass.sppp = p;} : (this: MyClass, p: number) => void
 >this : MyClass
 >MyClass : MyClass
 >p : number
@@ -62,17 +74,38 @@ MyClass.prototype.extension1 = function (this: MyClass, p: number) {
 >this.ppp : number
 >this : MyClass
 >ppp : number
+>p : number
+
+    MyClass.sp = p;
+>MyClass.sp = p : number
+>MyClass.sp : number
+>MyClass : typeof MyClass
+>sp : number
+>p : number
+
+    MyClass.spp = p;
+>MyClass.spp = p : number
+>MyClass.spp : number
+>MyClass : typeof MyClass
+>spp : number
+>p : number
+
+    MyClass.sppp = p;
+>MyClass.sppp = p : number
+>MyClass.sppp : number
+>MyClass : typeof MyClass
+>sppp : number
 >p : number
 }
 
 MyClass.prototype.extension2 = function<T extends MyClass> (this: T, p: number) { 
->MyClass.prototype.extension2 = function<T extends MyClass> (this: T, p: number) {     this.p = p;    this.pp = p;    this.ppp = p;} : <T extends MyClass>(this: T, p: number) => void
+>MyClass.prototype.extension2 = function<T extends MyClass> (this: T, p: number) {     this.p = p;    this.pp = p;    this.ppp = p;    MyClass.sp = p;    MyClass.spp = p;    MyClass.sppp = p;} : <T extends MyClass>(this: T, p: number) => void
 >MyClass.prototype.extension2 : (p: number) => void
 >MyClass.prototype : MyClass
 >MyClass : typeof MyClass
 >prototype : MyClass
 >extension2 : (p: number) => void
->function<T extends MyClass> (this: T, p: number) {     this.p = p;    this.pp = p;    this.ppp = p;} : <T extends MyClass>(this: T, p: number) => void
+>function<T extends MyClass> (this: T, p: number) {     this.p = p;    this.pp = p;    this.ppp = p;    MyClass.sp = p;    MyClass.spp = p;    MyClass.sppp = p;} : <T extends MyClass>(this: T, p: number) => void
 >T : T
 >MyClass : MyClass
 >this : T
@@ -98,6 +131,27 @@ MyClass.prototype.extension2 = function<T extends MyClass> (this: T, p: number)
 >this.ppp : number
 >this : T
 >ppp : number
+>p : number
+
+    MyClass.sp = p;
+>MyClass.sp = p : number
+>MyClass.sp : number
+>MyClass : typeof MyClass
+>sp : number
+>p : number
+
+    MyClass.spp = p;
+>MyClass.spp = p : number
+>MyClass.spp : number
+>MyClass : typeof MyClass
+>spp : number
+>p : number
+
+    MyClass.sppp = p;
+>MyClass.sppp = p : number
+>MyClass.sppp : number
+>MyClass : typeof MyClass
+>sppp : number
 >p : number
 }
 
@@ -128,6 +182,27 @@ function extension3<T extends MyClass> (this: T, p: number) {
 >this.ppp : number
 >this : T
 >ppp : number
+>p : number
+
+    MyClass.sp = p;
+>MyClass.sp = p : number
+>MyClass.sp : number
+>MyClass : typeof MyClass
+>sp : number
+>p : number
+
+    MyClass.spp = p;
+>MyClass.spp = p : number
+>MyClass.spp : number
+>MyClass : typeof MyClass
+>spp : number
+>p : number
+
+    MyClass.sppp = p;
+>MyClass.sppp = p : number
+>MyClass.sppp : number
+>MyClass : typeof MyClass
+>sppp : number
 >p : number
 }
 
diff --git a/tests/cases/conformance/types/thisType/thisTypeAccessibility.ts b/tests/cases/conformance/types/thisType/thisTypeAccessibility.ts
index 28d55222d5a..6cdc9e71225 100644
--- a/tests/cases/conformance/types/thisType/thisTypeAccessibility.ts
+++ b/tests/cases/conformance/types/thisType/thisTypeAccessibility.ts
@@ -2,6 +2,9 @@ class MyClass {
     private p: number = 123;
     protected pp: number = 123;
     public ppp: number = 123;
+    private static sp: number = 123;
+    protected static spp: number = 123;
+    public static sppp: number = 123;
 }
 
 interface MyClass {
@@ -14,18 +17,27 @@ MyClass.prototype.extension1 = function (this: MyClass, p: number) {
     this.p = p;
     this.pp = p;
     this.ppp = p;
+    MyClass.sp = p;
+    MyClass.spp = p;
+    MyClass.sppp = p;
 }
 
 MyClass.prototype.extension2 = function<T extends MyClass> (this: T, p: number) { 
     this.p = p;
     this.pp = p;
     this.ppp = p;
+    MyClass.sp = p;
+    MyClass.spp = p;
+    MyClass.sppp = p;
 }
 
 function extension3<T extends MyClass> (this: T, p: number) { 
     this.p = p;
     this.pp = p;
     this.ppp = p;
+    MyClass.sp = p;
+    MyClass.spp = p;
+    MyClass.sppp = p;
 }
 
 MyClass.prototype.extension3 = extension3;

From 56d042468f7e84f6ed537e54300fc74bd3054ff1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E7=8E=8B=E6=96=87=E7=92=90?= <kingwenlu@gmail.com>
Date: Tue, 5 Jun 2018 18:45:36 +0800
Subject: [PATCH 14/37] add commnet

---
 src/compiler/checker.ts | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index be8b11bf1f0..e2c4c81751c 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -17107,6 +17107,8 @@ namespace ts {
             });
             // A protected property is accessible if the property is within the declaring class or classes derived from it
             if (!enclosingClass) {
+                // allow PropertyAccessibility if context is in function with this parameter
+                // static member access is disallow
                 let thisParameter: ParameterDeclaration | undefined;
                 const thisContainer = getThisContainer(node, /* includeArrowFunctions */ false);
                 if (flags & ModifierFlags.Static || !thisContainer || !isFunctionLike(thisContainer) || !(thisParameter = getThisParameter(thisContainer)) || !thisParameter.type) {

From ee310a42f0c20f02f349e4296dbda8b5bde8485e Mon Sep 17 00:00:00 2001
From: kingwl <kingwenlu@gmail.com>
Date: Sat, 9 Jun 2018 03:08:15 +0800
Subject: [PATCH 15/37] move static flag predicate before get container

---
 src/compiler/checker.ts | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index e2c4c81751c..38cf01ed9b9 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -17110,8 +17110,7 @@ namespace ts {
                 // allow PropertyAccessibility if context is in function with this parameter
                 // static member access is disallow
                 let thisParameter: ParameterDeclaration | undefined;
-                const thisContainer = getThisContainer(node, /* includeArrowFunctions */ false);
-                if (flags & ModifierFlags.Static || !thisContainer || !isFunctionLike(thisContainer) || !(thisParameter = getThisParameter(thisContainer)) || !thisParameter.type) {
+                if (flags & ModifierFlags.Static || !(thisParameter = getThisParameterFromNodeContext(node)) || !thisParameter.type) {
                     error(errorNode, Diagnostics.Property_0_is_protected_and_only_accessible_within_class_1_and_its_subclasses, symbolToString(prop), typeToString(getDeclaringClass(prop) || type));
                     return false;
                 }
@@ -17134,6 +17133,11 @@ namespace ts {
             return true;
         }
 
+        function getThisParameterFromNodeContext (node: Node) {
+            const thisContainer = getThisContainer(node, /* includeArrowFunctions */ false);
+            return thisContainer && isFunctionLike(thisContainer) ? getThisParameter(thisContainer) : undefined;
+        }
+
         function symbolHasNonMethodDeclaration(symbol: Symbol) {
             return forEachProperty(symbol, prop => {
                 const propKind = getDeclarationKindFromSymbol(prop);

From 153f25a4755e1b166f3db4d8139cb3c082696be0 Mon Sep 17 00:00:00 2001
From: Sheetal Nandi <shkamat@microsoft.com>
Date: Fri, 8 Jun 2018 16:55:49 -0700
Subject: [PATCH 16/37] Updates the graph before checking if file is present in
 project for error checking When file is moved using getEditsForFileRename,
 the watch notification could be delayed This could result in project updates
 in background that could be delayed and result in file not present in the
 project after its synchronised Fixes #24547

---
 .../unittests/tsserverProjectSystem.ts        | 146 ++++++++++++++++--
 src/server/session.ts                         |   2 +
 2 files changed, 139 insertions(+), 9 deletions(-)

diff --git a/src/harness/unittests/tsserverProjectSystem.ts b/src/harness/unittests/tsserverProjectSystem.ts
index 70341b18368..9205f7c781e 100644
--- a/src/harness/unittests/tsserverProjectSystem.ts
+++ b/src/harness/unittests/tsserverProjectSystem.ts
@@ -62,6 +62,18 @@ namespace ts.projectSystem {
         getLogFileName: () => undefined,
     };
 
+    function createHasErrorMessageLogger() {
+        let hasErrorMsg = false;
+        const { close, hasLevel, loggingEnabled, startGroup, endGroup, info, getLogFileName, perftrc } = nullLogger;
+        const logger: server.Logger = {
+            close, hasLevel, loggingEnabled, startGroup, endGroup, info, getLogFileName, perftrc,
+            msg: () => {
+                hasErrorMsg = true;
+            }
+        };
+        return { logger, hasErrorMsg: () => hasErrorMsg };
+    }
+
     export class TestTypingsInstaller extends TI.TypingsInstaller implements server.ITypingsInstaller {
         protected projectService: server.ProjectService;
         constructor(
@@ -2917,14 +2929,7 @@ namespace ts.projectSystem {
         });
 
         it("Getting errors from closed script info does not throw exception (because of getting project from orphan script info)", () => {
-            let hasErrorMsg = false;
-            const { close, hasLevel, loggingEnabled, startGroup, endGroup, info, getLogFileName, perftrc } = nullLogger;
-            const logger: server.Logger = {
-                close, hasLevel, loggingEnabled, startGroup, endGroup, info, getLogFileName, perftrc,
-                msg: () => {
-                    hasErrorMsg = true;
-                }
-            };
+            const { logger, hasErrorMsg } = createHasErrorMessageLogger();
             const f1 = {
                 path: "/a/b/app.ts",
                 content: "let x = 1;"
@@ -2954,7 +2959,7 @@ namespace ts.projectSystem {
                     files: [f1.path]
                 }
             });
-            assert.isFalse(hasErrorMsg);
+            assert.isFalse(hasErrorMsg());
         });
 
         it("Changed module resolution reflected when specifying files list", () => {
@@ -3320,6 +3325,129 @@ namespace ts.projectSystem {
                 assert.equal(info.containingProjects.length, 0);
             }
         });
+
+        it("handles delayed directory watch invoke on file creation", () => {
+            const projectRootPath = "/users/username/projects/project";
+            const fileB: File = {
+                path: `${projectRootPath}/b.ts`,
+                content: "export const b = 10;"
+            };
+            const fileA: File = {
+                path: `${projectRootPath}/a.ts`,
+                content: "export const a = 10;"
+            };
+            const fileSubA: File = {
+                path: `${projectRootPath}/sub/a.ts`,
+                content: fileA.content
+            };
+            const config: File = {
+                path: `${projectRootPath}/tsconfig.json`,
+                content: "{}"
+            };
+            const files = [fileSubA, fileB, config, libFile];
+            const host = createServerHost(files);
+            const { logger, hasErrorMsg } = createHasErrorMessageLogger();
+            const session = createSession(host, { canUseEvents: true, noGetErrOnBackgroundUpdate: true, logger });
+            openFile(fileB);
+            openFile(fileSubA);
+
+            const services = session.getProjectService();
+            checkNumberOfProjects(services, { configuredProjects: 1 });
+            checkProjectActualFiles(services.configuredProjects.get(config.path)!, files.map(f => f.path));
+            host.checkTimeoutQueueLengthAndRun(0);
+
+            // This should schedule 2 timeouts for ensuring project structure and ensuring projects for open file
+            const filesWithFileA = files.map(f => f === fileSubA ? fileA : f);
+            host.reloadFS(files.map(f => f === fileSubA ? fileA : f));
+            host.checkTimeoutQueueLength(2);
+
+            closeFile(fileSubA);
+            // This should cancel existing updates and schedule new ones
+            host.checkTimeoutQueueLength(2);
+            checkNumberOfProjects(services, { configuredProjects: 1 });
+            checkProjectActualFiles(services.configuredProjects.get(config.path)!, files.map(f => f.path));
+
+            // Open the fileA (as if rename)
+            openFile(fileA);
+
+            // config project is updated to check if fileA is present in it
+            checkNumberOfProjects(services, { configuredProjects: 1 });
+            checkProjectActualFiles(services.configuredProjects.get(config.path)!, filesWithFileA.map(f => f.path));
+
+            // Run the timeout for updating configured project and ensuring projects for open file
+            host.checkTimeoutQueueLengthAndRun(2);
+            checkProjectActualFiles(services.configuredProjects.get(config.path)!, filesWithFileA.map(f => f.path));
+
+            // file is deleted but watches are not yet invoked
+            const originalFileExists = host.fileExists;
+            host.fileExists = s => s === fileA.path ? false : originalFileExists.call(host, s);
+            closeFile(fileA);
+            host.checkTimeoutQueueLength(2); // Update configured project and projects for open file
+            checkProjectActualFiles(services.configuredProjects.get(config.path)!, filesWithFileA.map(f => f.path));
+
+           // host.fileExists = originalFileExists;
+            openFile(fileSubA);
+            // This should create inferred project since fileSubA not on the disk
+            checkProjectActualFiles(services.configuredProjects.get(config.path)!, mapDefined(filesWithFileA, f => f === fileA ? undefined : f.path));
+            checkProjectActualFiles(services.inferredProjects[0], [fileSubA.path, libFile.path]);
+
+            host.checkTimeoutQueueLengthAndRun(2); // Update configured project and projects for open file
+            host.fileExists = originalFileExists;
+
+            // Actually trigger the file move
+            host.reloadFS(files);
+            host.checkTimeoutQueueLength(2);
+            const fileBErrorTimeoutId = host.getNextTimeoutId();
+
+            session.executeCommandSeq<protocol.GeterrRequest>({
+                command: protocol.CommandTypes.Geterr,
+                arguments: {
+                    files: [fileB.path, fileSubA.path],
+                    delay: 0
+                }
+            });
+            const getErrSeqId = session.getSeq();
+            host.checkTimeoutQueueLength(3);
+
+            session.clearMessages();
+            host.runQueuedTimeoutCallbacks(fileBErrorTimeoutId);
+            checkErrorMessage(session, "syntaxDiag", { file: fileB.path, diagnostics: [] });
+
+            session.clearMessages();
+            host.runQueuedImmediateCallbacks();
+            checkErrorMessage(session, "semanticDiag", { file: fileB.path, diagnostics: [] });
+
+            session.clearMessages();
+            const fileSubAErrorTimeoutId = host.getNextTimeoutId();
+            host.runQueuedImmediateCallbacks();
+            checkErrorMessage(session, "suggestionDiag", { file: fileB.path, diagnostics: [] });
+
+            session.clearMessages();
+            host.checkTimeoutQueueLength(3);
+            host.runQueuedTimeoutCallbacks(fileSubAErrorTimeoutId);
+            checkCompleteEvent(session, 1, getErrSeqId);
+            assert.isFalse(hasErrorMsg());
+
+            function openFile(file: File) {
+                session.executeCommandSeq<protocol.OpenRequest>({
+                    command: protocol.CommandTypes.Open,
+                    arguments: {
+                        file: file.path,
+                        fileContent: file.content,
+                        projectRootPath
+                    }
+                });
+            }
+
+            function closeFile(file: File) {
+                session.executeCommandSeq<protocol.CloseRequest>({
+                    command: protocol.CommandTypes.Close,
+                    arguments: {
+                        file: file.path
+                    }
+                });
+            }
+        });
     });
 
     describe("tsserverProjectSystem Proper errors", () => {
diff --git a/src/server/session.ts b/src/server/session.ts
index d24e2addd33..2f36759b8f2 100644
--- a/src/server/session.ts
+++ b/src/server/session.ts
@@ -511,6 +511,8 @@ namespace ts.server {
 
                 const { fileName, project } = checkList[index];
                 index++;
+                // Ensure the project is upto date before checking if this file is present in the project
+                project.updateGraph();
                 if (!project.containsFile(fileName, requireOpen)) {
                     return;
                 }

From 336c37662d11f8c8bc0751d98f051c44f23b56f7 Mon Sep 17 00:00:00 2001
From: Ryan Cavanaugh <the.ryan.cavanaugh@gmail.com>
Date: Sat, 9 Jun 2018 16:48:08 -0700
Subject: [PATCH 17/37] Projzilla phase 1

---
 Jakefile.js                                   |  1145 +-
 scripts/tslint/tsconfig.json                  |     2 +
 src/built/local/cancellationToken.js          |    57 +
 src/built/local/cancellationToken.js.map      |     1 +
 src/built/local/harness.d.ts                  |  2223 +++
 src/built/local/harness.js                    | 11641 ++++++++++++++++
 src/built/local/harness.js.map                |     1 +
 .../cancellationToken/cancellationToken.ts    |     0
 .../cancellationToken/tsconfig.json           |     5 +-
 src/compiler/resolutionCache.ts               |    16 +-
 src/compiler/tsconfig.json                    |    20 +-
 src/{compiler => core}/core.ts                |  1774 +--
 src/{compiler => core}/performance.ts         |     0
 src/core/tsconfig.json                        |    11 +
 src/{server => harness}/client.ts             |     0
 src/harness/fourslash.ts                      |    32 +-
 src/harness/harness.ts                        |    28 -
 src/harness/harnessLanguageService.ts         |     5 -
 src/harness/loggedIO.ts                       |     6 -
 src/harness/sourceMapRecorder.ts              |    17 -
 src/harness/tsconfig.json                     |   162 +-
 src/harness/virtualFileSystemWithWatch.ts     |     2 -
 src/{compiler => parser}/commandLineParser.ts |     0
 .../diagnosticInformationMap.generated.ts     |  1107 ++
 src/parser/diagnosticMessages.generated.json  |  1098 ++
 .../diagnosticMessages.json                   |     0
 src/{compiler => parser}/parser.ts            |     0
 src/{compiler => parser}/scanner.ts           |     0
 src/{compiler => parser}/sys.ts               |     0
 src/parser/tsconfig.json                      |    18 +
 src/{compiler => parser}/types.ts             |    61 -
 src/{compiler => parser}/utilities.ts         |  1581 ++-
 src/server/tsconfig.json                      |   128 +-
 src/server/tsconfig.library.json              |   146 -
 src/server/typingsInstaller/tsconfig.json     |    32 -
 src/services/tsconfig.json                    |    51 +-
 src/{harness => testRunner}/compilerRunner.ts |     8 -
 .../externalCompileRunner.ts                  |     2 -
 .../fourslashRunner.ts                        |    23 +-
 src/{harness => testRunner}/parallel/host.ts  |     0
 .../parallel/shared.ts                        |     0
 .../parallel/worker.ts                        |     0
 src/{harness => testRunner}/projectsRunner.ts |     8 -
 src/{harness => testRunner}/runner.ts         |    50 +-
 src/{harness => testRunner}/rwcRunner.ts      |     4 -
 src/{harness => testRunner}/test262Runner.ts  |     2 -
 src/testRunner/tsconfig.json                  |    39 +
 src/{compiler => tsc}/tsc.ts                  |     0
 src/tsc/tsconfig.json                         |    13 +
 src/tsconfig-base.json                        |    13 +-
 src/tsconfig.json                             |     7 +
 src/{server => tsserver}/server.ts            |     0
 src/tsserver/tsconfig.json                    |    19 +
 .../typingsInstaller/nodeTypingsInstaller.ts  |     0
 src/typingsInstaller/tsconfig.json            |    28 +
 src/typingsInstallerCore/tsconfig.json        |    25 +
 .../typingsInstaller.ts                       |     0
 src/{harness => }/unittests/asserts.ts        |     2 -
 src/{harness => }/unittests/base64.ts         |     1 -
 src/{harness => }/unittests/builder.ts        |     2 -
 .../cancellableLanguageServiceOperations.ts   |     2 -
 .../unittests/commandLineParsing.ts           |     3 -
 src/{harness => }/unittests/compileOnSave.ts  |     4 -
 .../unittests/configurationExtension.ts       |     4 -
 .../convertCompilerOptionsFromJson.ts         |     5 -
 .../unittests/convertToBase64.ts              |     2 -
 .../convertTypeAcquisitionFromJson.ts         |     5 -
 .../unittests/customTransforms.ts             |     3 -
 .../unittests/evaluation/asyncArrow.ts        |     0
 .../unittests/evaluation/asyncGenerator.ts    |     0
 .../unittests/evaluation/forAwaitOf.ts        |     0
 .../unittests/extractConstants.ts             |     2 -
 .../unittests/extractFunctions.ts             |     2 -
 src/{harness => }/unittests/extractRanges.ts  |     2 -
 .../unittests/extractTestHelpers.ts           |     3 -
 .../unittests/hostNewLineSupport.ts           |     1 -
 .../unittests/incrementalParser.ts            |     3 -
 .../unittests/initializeTSConfig.ts           |     3 -
 src/{harness => }/unittests/jsDocParsing.ts   |     3 -
 .../unittests/languageService.ts              |     2 -
 src/{harness => }/unittests/matchFiles.ts     |     4 -
 .../unittests/moduleResolution.ts             |     2 -
 .../unittests/organizeImports.ts              |     4 -
 src/{harness => }/unittests/paths.ts          |     0
 src/{harness => }/unittests/printer.ts        |     3 -
 .../unittests/programMissingFiles.ts          |     4 -
 .../unittests/programNoParseFalsyFileNames.ts |     1 -
 src/{harness => }/unittests/projectErrors.ts  |     4 -
 .../unittests/projectReferences.ts            |     3 -
 src/{harness => }/unittests/publicApi.ts      |     2 -
 .../unittests/reuseProgramStructure.ts        |     3 -
 .../unittests/services/colorization.ts        |     2 -
 .../unittests/services/documentRegistry.ts    |     2 -
 .../unittests/services/patternMatcher.ts      |     2 -
 .../unittests/services/preProcessFile.ts      |     2 -
 src/{harness => }/unittests/session.ts        |     2 -
 src/{harness => }/unittests/symbolWalker.ts   |     2 -
 src/{harness => }/unittests/telemetry.ts      |     3 -
 src/{harness => }/unittests/textChanges.ts    |     4 -
 src/{harness => }/unittests/textStorage.ts    |     4 -
 src/{harness => }/unittests/transform.ts      |     3 -
 src/{harness => }/unittests/transpile.ts      |     2 -
 src/{harness => }/unittests/tsbuild.ts        |     0
 src/{harness => }/unittests/tscWatchMode.ts   |     4 -
 src/unittests/tsconfig.json                   |    23 +
 .../unittests/tsconfigParsing.ts              |     5 -
 .../unittests/tsserverProjectSystem.ts        |     4 -
 .../unittests/typingsInstaller.ts             |     5 -
 src/{harness => }/unittests/versionCache.ts   |     3 -
 src/{server => }/watchGuard/tsconfig.json     |     4 +-
 src/{server => }/watchGuard/watchGuard.ts     |     0
 111 files changed, 18277 insertions(+), 3494 deletions(-)
 create mode 100644 src/built/local/cancellationToken.js
 create mode 100644 src/built/local/cancellationToken.js.map
 create mode 100644 src/built/local/harness.d.ts
 create mode 100644 src/built/local/harness.js
 create mode 100644 src/built/local/harness.js.map
 rename src/{server => }/cancellationToken/cancellationToken.ts (100%)
 rename src/{server => }/cancellationToken/tsconfig.json (62%)
 rename src/{compiler => core}/core.ts (52%)
 rename src/{compiler => core}/performance.ts (100%)
 create mode 100644 src/core/tsconfig.json
 rename src/{server => harness}/client.ts (100%)
 rename src/{compiler => parser}/commandLineParser.ts (100%)
 create mode 100644 src/parser/diagnosticInformationMap.generated.ts
 create mode 100644 src/parser/diagnosticMessages.generated.json
 rename src/{compiler => parser}/diagnosticMessages.json (100%)
 rename src/{compiler => parser}/parser.ts (100%)
 rename src/{compiler => parser}/scanner.ts (100%)
 rename src/{compiler => parser}/sys.ts (100%)
 create mode 100644 src/parser/tsconfig.json
 rename src/{compiler => parser}/types.ts (97%)
 rename src/{compiler => parser}/utilities.ts (77%)
 delete mode 100644 src/server/tsconfig.library.json
 delete mode 100644 src/server/typingsInstaller/tsconfig.json
 rename src/{harness => testRunner}/compilerRunner.ts (95%)
 rename src/{harness => testRunner}/externalCompileRunner.ts (97%)
 rename src/{harness => testRunner}/fourslashRunner.ts (79%)
 rename src/{harness => testRunner}/parallel/host.ts (100%)
 rename src/{harness => testRunner}/parallel/shared.ts (100%)
 rename src/{harness => testRunner}/parallel/worker.ts (100%)
 rename src/{harness => testRunner}/projectsRunner.ts (97%)
 rename src/{harness => testRunner}/runner.ts (80%)
 rename src/{harness => testRunner}/rwcRunner.ts (96%)
 rename src/{harness => testRunner}/test262Runner.ts (96%)
 create mode 100644 src/testRunner/tsconfig.json
 rename src/{compiler => tsc}/tsc.ts (100%)
 create mode 100644 src/tsc/tsconfig.json
 create mode 100644 src/tsconfig.json
 rename src/{server => tsserver}/server.ts (100%)
 create mode 100644 src/tsserver/tsconfig.json
 rename src/{server => }/typingsInstaller/nodeTypingsInstaller.ts (100%)
 create mode 100644 src/typingsInstaller/tsconfig.json
 create mode 100644 src/typingsInstallerCore/tsconfig.json
 rename src/{server/typingsInstaller => typingsInstallerCore}/typingsInstaller.ts (100%)
 rename src/{harness => }/unittests/asserts.ts (91%)
 rename src/{harness => }/unittests/base64.ts (92%)
 rename src/{harness => }/unittests/builder.ts (97%)
 rename src/{harness => }/unittests/cancellableLanguageServiceOperations.ts (97%)
 rename src/{harness => }/unittests/commandLineParsing.ts (97%)
 rename src/{harness => }/unittests/compileOnSave.ts (97%)
 rename src/{harness => }/unittests/configurationExtension.ts (97%)
 rename src/{harness => }/unittests/convertCompilerOptionsFromJson.ts (97%)
 rename src/{harness => }/unittests/convertToBase64.ts (94%)
 rename src/{harness => }/unittests/convertTypeAcquisitionFromJson.ts (95%)
 rename src/{harness => }/unittests/customTransforms.ts (95%)
 rename src/{harness => }/unittests/evaluation/asyncArrow.ts (100%)
 rename src/{harness => }/unittests/evaluation/asyncGenerator.ts (100%)
 rename src/{harness => }/unittests/evaluation/forAwaitOf.ts (100%)
 rename src/{harness => }/unittests/extractConstants.ts (95%)
 rename src/{harness => }/unittests/extractFunctions.ts (95%)
 rename src/{harness => }/unittests/extractRanges.ts (95%)
 rename src/{harness => }/unittests/extractTestHelpers.ts (96%)
 rename src/{harness => }/unittests/hostNewLineSupport.ts (96%)
 rename src/{harness => }/unittests/incrementalParser.ts (97%)
 rename src/{harness => }/unittests/initializeTSConfig.ts (93%)
 rename src/{harness => }/unittests/jsDocParsing.ts (96%)
 rename src/{harness => }/unittests/languageService.ts (95%)
 rename src/{harness => }/unittests/matchFiles.ts (97%)
 rename src/{harness => }/unittests/moduleResolution.ts (98%)
 rename src/{harness => }/unittests/organizeImports.ts (96%)
 rename src/{harness => }/unittests/paths.ts (100%)
 rename src/{harness => }/unittests/printer.ts (97%)
 rename src/{harness => }/unittests/programMissingFiles.ts (95%)
 rename src/{harness => }/unittests/programNoParseFalsyFileNames.ts (96%)
 rename src/{harness => }/unittests/projectErrors.ts (96%)
 rename src/{harness => }/unittests/projectReferences.ts (96%)
 rename src/{harness => }/unittests/publicApi.ts (94%)
 rename src/{harness => }/unittests/reuseProgramStructure.ts (98%)
 rename src/{harness => }/unittests/services/colorization.ts (97%)
 rename src/{harness => }/unittests/services/documentRegistry.ts (97%)
 rename src/{harness => }/unittests/services/patternMatcher.ts (97%)
 rename src/{harness => }/unittests/services/preProcessFile.ts (97%)
 rename src/{harness => }/unittests/session.ts (97%)
 rename src/{harness => }/unittests/symbolWalker.ts (95%)
 rename src/{harness => }/unittests/telemetry.ts (96%)
 rename src/{harness => }/unittests/textChanges.ts (97%)
 rename src/{harness => }/unittests/textStorage.ts (93%)
 rename src/{harness => }/unittests/transform.ts (97%)
 rename src/{harness => }/unittests/transpile.ts (97%)
 rename src/{harness => }/unittests/tsbuild.ts (100%)
 rename src/{harness => }/unittests/tscWatchMode.ts (97%)
 create mode 100644 src/unittests/tsconfig.json
 rename src/{harness => }/unittests/tsconfigParsing.ts (96%)
 rename src/{harness => }/unittests/tsserverProjectSystem.ts (97%)
 rename src/{harness => }/unittests/typingsInstaller.ts (97%)
 rename src/{harness => }/unittests/versionCache.ts (96%)
 rename src/{server => }/watchGuard/tsconfig.json (65%)
 rename src/{server => }/watchGuard/watchGuard.ts (100%)

diff --git a/Jakefile.js b/Jakefile.js
index a6483355c73..8329f66118f 100644
--- a/Jakefile.js
+++ b/Jakefile.js
@@ -2,759 +2,71 @@
 // @ts-check
 /// <reference types="jake" />
 
-var fs = require("fs");
-var os = require("os");
-var path = require("path");
-var child_process = require("child_process");
-var fold = require("travis-fold");
-var ts = require("./lib/typescript");
+const fs = require("fs");
+const os = require("os");
+const path = require("path");
+const child_process = require("child_process");
+const fold = require("travis-fold");
+const ts = require("./lib/typescript");
+const del = require("del");
 const getDirSize = require("./scripts/build/getDirSize");
 
-// Variables
-var compilerDirectory = "src/compiler/";
-var serverDirectory = "src/server/";
-var harnessDirectory = "src/harness/";
-var libraryDirectory = "src/lib/";
-var scriptsDirectory = "scripts/";
-var unittestsDirectory = "src/harness/unittests/";
-var docDirectory = "doc/";
-var lclDirectory = "src/loc/lcl";
+const host = process.env.TYPESCRIPT_HOST || process.env.host || "node";
 
-var builtDirectory = "built/";
-var builtLocalDirectory = "built/local/";
-var LKGDirectory = "lib/";
+const defaultTestTimeout = 40000;
 
-var copyright = "CopyrightNotice.txt";
-var thirdParty = "ThirdPartyNoticeText.txt";
-
-var defaultTestTimeout = 40000;
-
-// add node_modules to path so we don't need global modules, prefer the modules by adding them first
-var nodeModulesPathPrefix = path.resolve("./node_modules/.bin/") + path.delimiter;
-if (process.env.path !== undefined) {
-    process.env.path = nodeModulesPathPrefix + process.env.path;
-}
-else if (process.env.PATH !== undefined) {
-    process.env.PATH = nodeModulesPathPrefix + process.env.PATH;
+const TaskNames = {
+    runtests: "runtests",
+    runtestsParallel: "runtests-parallel",
+    buildRules: "build-rules",
+    clean: "clean"
 }
 
-/**
- * @param diagnostics {ts.Diagnostic[]}
- * @param [pretty] {boolean}
- */
-function diagnosticsToString(diagnostics, pretty) {
-    const host = {
-        getCurrentDirectory() { return process.cwd(); },
-        getCanonicalFileName(fileName) { return fileName; },
-        getNewLine() { return os.EOL; }
-    };
-    return pretty ? ts.formatDiagnosticsWithColorAndContext(diagnostics, host) :
-        ts.formatDiagnostics(diagnostics, host);
-}
-
-/** @param diagnostics {ts.Diagnostic[]} */
-function reportDiagnostics(diagnostics) {
-    console.log(diagnosticsToString(diagnostics, process.stdout.isTTY));
-}
-
-/** @param jsonPath {string} */
-function readJson(jsonPath) {
-    const jsonText = fs.readFileSync(jsonPath, "utf8");
-    const result = ts.parseConfigFileTextToJson(jsonPath, jsonText);
-    if (result.error) {
-        reportDiagnostics([result.error]);
-        throw new Error("An error occurred during parse.");
+const Paths = {
+    lkgCompiler: "lib/tsc.js",
+    built: "built",
+    builtLocal: "built/local",
+    builtLocalCompiler: "built/local/tsc.js",
+    builtLocalRun: "built/local/run.js",
+    baselines: {
+        local: "tests/baselines/local",
+        localTest262: "tests/baselines/test262/local",
+        localRwc: "tests/baselines/rwc/local",
+        reference: "tests/baselines/reference",
+        referenceTest262: "tests/baselines/test262/reference",
+        referenceTwc: "tests/baselines/rwc/reference"
     }
-    return result.config;
 }
 
-/** @param configPath {string} */
-function filesFromConfig(configPath) {
-    const config = readJson(configPath);
-    const configFileContent = ts.parseJsonConfigFileContent(config, ts.sys, path.dirname(configPath));
-    if (configFileContent.errors && configFileContent.errors.length) {
-        reportDiagnostics(configFileContent.errors);
-        throw new Error("An error occurred during parse.");
-    }
-    return configFileContent.fileNames;
-}
+const ConfigFileFor = {
+    tsc: "src/tsc",
+    tsserver: "src/tsserver",
+    runjs: "src/testRunner",
+    lint: "scripts/tslint"
+};
 
-function toNs(diff) {
-    return diff[0] * 1e9 + diff[1];
-}
+desc("Runs all the tests in parallel using the built run.js file. Optional arguments are: t[ests]=category1|category2|... d[ebug]=true.");
+task(TaskNames.runtestsParallel, [TaskNames.buildRules], function() {
+    tsbuild(ConfigFileFor.runjs);
+    runConsoleTests("min", /*parallel*/ true);
+}, { async: true});
 
-function mark() {
-    if (!fold.isTravis()) return;
-    var stamp = process.hrtime();
-    var id = Math.floor(Math.random() * 0xFFFFFFFF).toString(16);
-    console.log("travis_time:start:" + id + "\r");
-    return {
-        stamp: stamp,
-        id: id
-    };
-}
+desc("Runs all the tests in parallel using the built run.js file. Optional arguments are: t[ests]=category1|category2|... d[ebug]=true.");
+task(TaskNames.runtests, [TaskNames.buildRules], function() {
+    tsbuild(ConfigFileFor.runjs);
+    runConsoleTests('mocha-fivemat-progress-reporter', /*runInParallel*/ false);;
+}, { async: true});
 
-function measure(marker) {
-    if (!fold.isTravis()) return;
-    var diff = process.hrtime(marker.stamp);
-    var total = [marker.stamp[0] + diff[0], marker.stamp[1] + diff[1]];
-    console.log("travis_time:end:" + marker.id + ":start=" + toNs(marker.stamp) + ",finish=" + toNs(total) + ",duration=" + toNs(diff) + "\r");
-}
-
-function removeConstModifierFromEnumDeclarations(text) {
-     return text.replace(/^(\s*)(export )?const enum (\S+) {(\s*)$/gm, '$1$2enum $3 {$4');
-}
-
-var compilerSources = filesFromConfig("./src/compiler/tsconfig.json");
-var servicesSources = filesFromConfig("./src/services/tsconfig.json");
-var cancellationTokenSources = filesFromConfig(path.join(serverDirectory, "cancellationToken/tsconfig.json"));
-var typingsInstallerSources = filesFromConfig(path.join(serverDirectory, "typingsInstaller/tsconfig.json"));
-var watchGuardSources = filesFromConfig(path.join(serverDirectory, "watchGuard/tsconfig.json"));
-var serverSources = filesFromConfig(path.join(serverDirectory, "tsconfig.json"));
-var languageServiceLibrarySources = filesFromConfig(path.join(serverDirectory, "tsconfig.library.json"));
-var harnessSources = filesFromConfig("./src/harness/tsconfig.json");
-
-var typesMapOutputPath = path.join(builtLocalDirectory, 'typesMap.json');
-
-/** @type {{ libs: string[], paths?: Record<string, string>, sources?: Record<string, string[]> }} */
-var libraries = readJson("./src/lib/libs.json");
-
-/**
- * .lcg file is what localization team uses to know what messages to localize.
- * The file is always generated in 'enu\diagnosticMessages.generated.json.lcg'
- */
-var generatedLCGFile = path.join(builtLocalDirectory, "enu", "diagnosticMessages.generated.json.lcg");
-
-/**
- * The localization target produces the two following transformations:
- *    1. 'src\loc\lcl\<locale>\diagnosticMessages.generated.json.lcl' => 'built\local\<locale>\diagnosticMessages.generated.json'
- *       convert localized resources into a .json file the compiler can understand
- *    2. 'src\compiler\diagnosticMessages.generated.json' => 'built\local\ENU\diagnosticMessages.generated.json.lcg'
- *       generate the lcg file (source of messages to localize) from the diagnosticMessages.generated.json
- */
-var localizationTargets = ["cs", "de", "es", "fr", "it", "ja", "ko", "pl", "pt-br", "ru", "tr", "zh-cn", "zh-tw"].map(function (f) {
-    return path.join(builtLocalDirectory, f);
-}).concat(path.dirname(generatedLCGFile));
-
-// Prepends the contents of prefixFile to destinationFile
-function prependFile(prefixFile, destinationFile) {
-    if (!fs.existsSync(prefixFile)) {
-        fail(prefixFile + " does not exist!");
-    }
-    if (!fs.existsSync(destinationFile)) {
-        fail(destinationFile + " failed to be created!");
-    }
-    var temp = "temptemp";
-    jake.cpR(prefixFile, temp, { silent: true });
-    fs.appendFileSync(temp, fs.readFileSync(destinationFile));
-    fs.renameSync(temp, destinationFile);
-}
-
-// concatenate a list of sourceFiles to a destinationFile
-function concatenateFiles(destinationFile, sourceFiles) {
-    var temp = "temptemp";
-    // append all files in sequence
-    var text = "";
-    for (var i = 0; i < sourceFiles.length; i++) {
-        if (!fs.existsSync(sourceFiles[i])) {
-            fail(sourceFiles[i] + " does not exist!");
-        }
-        if (i > 0) { text += "\n\n"; }
-        text += fs.readFileSync(sourceFiles[i]).toString().replace(/\r?\n/g, "\n");
-    }
-    fs.writeFileSync(temp, text);
-    // Move the file to the final destination
-    fs.renameSync(temp, destinationFile);
-}
-
-var useDebugMode = true;
-var host = process.env.TYPESCRIPT_HOST || process.env.host || "node";
-var compilerFilename = "tsc.js";
-var LKGCompiler = path.join(LKGDirectory, compilerFilename);
-var builtLocalCompiler = path.join(builtLocalDirectory, compilerFilename);
-
-/**
- * Compiles a file from a list of sources
- * @param {string} outFile the target file name
- * @param {string[]} sources an array of the names of the source files
- * @param {string[]} prereqs prerequisite tasks to compiling the file
- * @param {string[]} prefixes a list of files to prepend to the target file
- * @param {boolean} useBuiltCompiler true to use the built compiler, false to use the LKG
- * @param {object} [opts] property bag containing auxiliary options
- * @param {boolean} [opts.noOutFile] true to compile without using --out
- * @param {boolean} [opts.generateDeclarations] true to compile using --declaration
- * @param {string} [opts.outDir] value for '--outDir' command line option
- * @param {boolean} [opts.keepComments] false to compile using --removeComments
- * @param {boolean} [opts.preserveConstEnums] true if compiler should keep const enums in code
- * @param {boolean} [opts.noResolve] true if compiler should not include non-rooted files in compilation
- * @param {boolean} [opts.stripInternal] true if compiler should remove declarations marked as internal
- * @param {boolean} [opts.inlineSourceMap] true if compiler should inline sourceMap
- * @param {string[]} [opts.types] array of types to include in compilation
- * @param {string} [opts.lib] explicit libs to include.
- * @param {function(): void} [callback] a function to execute after the compilation process ends
- */
-function compileFile(outFile, sources, prereqs, prefixes, useBuiltCompiler, opts, callback) {
-    file(outFile, prereqs, function() {
-        var startCompileTime = mark();
-        opts = opts || {};
-        var compilerPath = useBuiltCompiler ? builtLocalCompiler : LKGCompiler;
-        var options = "--noImplicitAny --noImplicitThis --alwaysStrict --noEmitOnError";
-        if (opts.types) {
-            options += " --types " + opts.types.join(",");
-        }
-        options += " --pretty";
-        // Keep comments when specifically requested
-        // or when in debug mode.
-        if (!(opts.keepComments || useDebugMode)) {
-            options += " --removeComments";
-        }
-
-        if (opts.generateDeclarations) {
-            options += " --declaration";
-        }
-
-        if (opts.preserveConstEnums || useDebugMode) {
-            options += " --preserveConstEnums";
-        }
-
-        if (opts.outDir) {
-            options += " --outDir " + opts.outDir;
-        }
-
-        if (!opts.noOutFile) {
-            options += " --out " + outFile;
-        }
-        else {
-            options += " --module commonjs";
-        }
-
-        if (opts.noResolve) {
-            options += " --noResolve";
-        }
-
-        if (useDebugMode) {
-            if (opts.inlineSourceMap) {
-                options += " --inlineSourceMap --inlineSources";
-            }
-            else {
-                options += " --sourcemap";
-            }
-        }
-        options += " --newLine LF";
-
-        if (opts.stripInternal) {
-            options += " --stripInternal";
-        }
-        options +=  " --target es5";
-        if (opts.lib) {
-            options += " --lib " + opts.lib;
-        }
-        else {
-            options += " --lib es5";
-        }
-        options += " --noUnusedLocals --noUnusedParameters --strictNullChecks";
-
-        var cmd = host + " " + compilerPath + " " + options + " ";
-        cmd = cmd + sources.join(" ");
-        console.log(cmd + "\n");
-
-        var ex = jake.createExec([cmd]);
-        // Add listeners for output and error
-        ex.addListener("stdout", function (output) {
-            process.stdout.write(output);
-        });
-        ex.addListener("stderr", function (error) {
-            process.stderr.write(error);
-        });
-        ex.addListener("cmdEnd", function () {
-            if (!useDebugMode && prefixes && fs.existsSync(outFile)) {
-                for (var i in prefixes) {
-                    prependFile(prefixes[i], outFile);
-                }
-            }
-
-            if (callback) {
-                callback();
-            }
-
-            measure(startCompileTime);
-            complete();
-        });
-        ex.addListener("error", function () {
-            fs.unlinkSync(outFile);
-            fail("Compilation of " + outFile + " unsuccessful");
-            measure(startCompileTime);
-        });
-        ex.run();
-    }, { async: true });
-}
-
-// Prerequisite task for built directory and library typings
-directory(builtLocalDirectory);
-
-var libraryTargets = libraries.libs.map(function (lib) {
-    var relativeSources = ["header.d.ts"].concat(libraries.sources && libraries.sources[lib] || [lib + ".d.ts"]);
-    var relativeTarget = libraries.paths && libraries.paths[lib] || ("lib." + lib + ".d.ts");
-    var sources = [copyright].concat(relativeSources.map(s => path.join(libraryDirectory, s)));
-    var target = path.join(builtLocalDirectory, relativeTarget);
-    file(target, [builtLocalDirectory].concat(sources), function () {
-        concatenateFiles(target, sources);
-    });
-    return target;
-});
-
-// Lib target to build the library files
-desc("Builds the library targets");
-task("lib", libraryTargets);
-
-
-// Generate diagnostics
-var processDiagnosticMessagesJs = path.join(scriptsDirectory, "processDiagnosticMessages.js");
-var processDiagnosticMessagesTs = path.join(scriptsDirectory, "processDiagnosticMessages.ts");
-var processDiagnosticMessagesSources = filesFromConfig("./scripts/processDiagnosticMessages.tsconfig.json");
-
-var diagnosticMessagesJson = path.join(compilerDirectory, "diagnosticMessages.json");
-var diagnosticInfoMapTs = path.join(compilerDirectory, "diagnosticInformationMap.generated.ts");
-var generatedDiagnosticMessagesJSON = path.join(compilerDirectory, "diagnosticMessages.generated.json");
-var builtGeneratedDiagnosticMessagesJSON = path.join(builtLocalDirectory, "diagnosticMessages.generated.json");
-
-file(processDiagnosticMessagesTs);
-
-// processDiagnosticMessages script
-compileFile(processDiagnosticMessagesJs,
-    processDiagnosticMessagesSources,
-    processDiagnosticMessagesSources,
-    [],
-    /*useBuiltCompiler*/ false);
-
-// Localize diagnostics script
-var generateLocalizedDiagnosticMessagesJs = path.join(scriptsDirectory, "generateLocalizedDiagnosticMessages.js");
-var generateLocalizedDiagnosticMessagesTs = path.join(scriptsDirectory, "generateLocalizedDiagnosticMessages.ts");
-
-file(generateLocalizedDiagnosticMessagesTs);
-
-compileFile(generateLocalizedDiagnosticMessagesJs,
-    [generateLocalizedDiagnosticMessagesTs],
-    [generateLocalizedDiagnosticMessagesTs],
-    [],
-    /*useBuiltCompiler*/ false, { noOutFile: true, types: ["node", "xml2js"] });
-
-// Localize diagnostics
-file(generatedLCGFile, [generateLocalizedDiagnosticMessagesJs, diagnosticInfoMapTs, generatedDiagnosticMessagesJSON], function () {
-    var cmd = host + " " + generateLocalizedDiagnosticMessagesJs + " " + lclDirectory + " " + builtLocalDirectory + " " + generatedDiagnosticMessagesJSON;
-    console.log(cmd);
-    var ex = jake.createExec([cmd]);
-    // Add listeners for output and error
-    ex.addListener("stdout", function (output) {
-        process.stdout.write(output);
-    });
-    ex.addListener("stderr", function (error) {
-        process.stderr.write(error);
-    });
-    ex.addListener("cmdEnd", function () {
-        complete();
-    });
-    ex.run();
+desc("Compiles tslint rules to js");
+task(TaskNames.buildRules, [], function() {
+    tsbuild(ConfigFileFor.lint);
 }, { async: true });
 
-task("localize", [generatedLCGFile]);
-
-var buildProtocolTs = path.join(scriptsDirectory, "buildProtocol.ts");
-var buildProtocolJs = path.join(scriptsDirectory, "buildProtocol.js");
-var buildProtocolDts = path.join(builtLocalDirectory, "protocol.d.ts");
-var typescriptServicesDts = path.join(builtLocalDirectory, "typescriptServices.d.ts");
-
-file(buildProtocolTs);
-
-compileFile(buildProtocolJs,
-    [buildProtocolTs],
-    [buildProtocolTs],
-    [],
-    /*useBuiltCompiler*/ false,
-    { noOutFile: true, lib: "es6" });
-
-file(buildProtocolDts, [buildProtocolTs, buildProtocolJs, typescriptServicesDts], function() {
-
-    var protocolTs = path.join(serverDirectory, "protocol.ts");
-
-    var cmd = host + " " + buildProtocolJs + " "+ protocolTs + " " + typescriptServicesDts + " " + buildProtocolDts;
-    console.log(cmd);
-    var ex = jake.createExec([cmd]);
-    // Add listeners for output and error
-    ex.addListener("stdout", function (output) {
-        process.stdout.write(output);
-    });
-    ex.addListener("stderr", function (error) {
-        process.stderr.write(error);
-    });
-    ex.addListener("cmdEnd", function () {
-        complete();
-    });
-    ex.run();
-}, { async: true });
-
-// The generated diagnostics map; built for the compiler and for the 'generate-diagnostics' task
-file(diagnosticInfoMapTs, [processDiagnosticMessagesJs, diagnosticMessagesJson], function () {
-    var cmd = host + " " + processDiagnosticMessagesJs + " " + diagnosticMessagesJson;
-    console.log(cmd);
-    var ex = jake.createExec([cmd]);
-    // Add listeners for output and error
-    ex.addListener("stdout", function (output) {
-        process.stdout.write(output);
-    });
-    ex.addListener("stderr", function (error) {
-        process.stderr.write(error);
-    });
-    ex.addListener("cmdEnd", function () {
-        complete();
-    });
-    ex.run();
-}, { async: true });
-
-file(builtGeneratedDiagnosticMessagesJSON, [generatedDiagnosticMessagesJSON], function () {
-    if (fs.existsSync(builtLocalDirectory)) {
-        jake.cpR(generatedDiagnosticMessagesJSON, builtGeneratedDiagnosticMessagesJSON);
-    }
-});
-
-desc("Generates a diagnostic file in TypeScript based on an input JSON file");
-task("generate-diagnostics", [diagnosticInfoMapTs]);
-
-// Publish nightly
-var configurePrereleaseJs = path.join(scriptsDirectory, "configurePrerelease.js");
-var configurePrereleaseTs = path.join(scriptsDirectory, "configurePrerelease.ts");
-var packageJson = "package.json";
-var versionFile = path.join(compilerDirectory, "core.ts");
-
-file(configurePrereleaseTs);
-
-compileFile(/*outfile*/configurePrereleaseJs,
-            /*sources*/[configurePrereleaseTs],
-            /*prereqs*/[configurePrereleaseTs],
-            /*prefixes*/[],
-            /*useBuiltCompiler*/ false,
-    { noOutFile: true, generateDeclarations: false, keepComments: false, noResolve: false, stripInternal: false });
-
-task("setDebugMode", function () {
-    useDebugMode = true;
-});
-
-task("configure-nightly", [configurePrereleaseJs], function () {
-    var cmd = host + " " + configurePrereleaseJs + " dev " + packageJson + " " + versionFile;
-    console.log(cmd);
-    exec(cmd);
-}, { async: true });
-
-desc("Configure, build, test, and publish the nightly release.");
-task("publish-nightly", ["configure-nightly", "LKG", "clean", "setDebugMode", "runtests-parallel"], function () {
-    var cmd = "npm publish --tag next";
-    console.log(cmd);
-    exec(cmd);
-});
-
-task("configure-insiders", [configurePrereleaseJs], function () {
-    var cmd = host + " " + configurePrereleaseJs + " insiders " + packageJson + " " + versionFile;
-    console.log(cmd);
-    exec(cmd);
-}, { async: true });
-
-desc("Configure, build, test, and publish the insiders release.");
-task("publish-insiders", ["configure-insiders", "LKG", "clean", "setDebugMode", "runtests-parallel"], function () {
-    var cmd = "npm publish --tag insiders";
-    console.log(cmd);
-    exec(cmd);
-});
-
-var importDefinitelyTypedTestsDirectory = path.join(scriptsDirectory, "importDefinitelyTypedTests");
-var importDefinitelyTypedTestsJs = path.join(importDefinitelyTypedTestsDirectory, "importDefinitelyTypedTests.js");
-var importDefinitelyTypedTestsTs = path.join(importDefinitelyTypedTestsDirectory, "importDefinitelyTypedTests.ts");
-
-file(importDefinitelyTypedTestsTs);
-file(importDefinitelyTypedTestsJs, ["tsd-scripts", importDefinitelyTypedTestsTs], function () {
-    var cmd = host + " " + LKGCompiler + " -p " + importDefinitelyTypedTestsDirectory;
-    console.log(cmd);
-    exec(cmd);
-}, { async: true });
-
-task("importDefinitelyTypedTests", [importDefinitelyTypedTestsJs], function () {
-    var cmd = host + " " + importDefinitelyTypedTestsJs + " ./ ../DefinitelyTyped";
-    console.log(cmd);
-    exec(cmd);
-}, { async: true });
-
-// Local target to build the compiler and services
-var tscFile = path.join(builtLocalDirectory, compilerFilename);
-compileFile(tscFile, compilerSources, [builtLocalDirectory, copyright].concat(compilerSources), [copyright], /*useBuiltCompiler:*/ false);
-
-var servicesFile = path.join(builtLocalDirectory, "typescriptServices.js");
-var standaloneDefinitionsFile = path.join(builtLocalDirectory, "typescriptServices.d.ts");
-var nodePackageFile = path.join(builtLocalDirectory, "typescript.js");
-var nodeDefinitionsFile = path.join(builtLocalDirectory, "typescript.d.ts");
-var nodeStandaloneDefinitionsFile = path.join(builtLocalDirectory, "typescript_standalone.d.ts");
-
-compileFile(servicesFile, servicesSources, [builtLocalDirectory, copyright].concat(servicesSources),
-            /*prefixes*/[copyright],
-            /*useBuiltCompiler*/ true,
-            /*opts*/ {
-        noOutFile: false,
-        generateDeclarations: true,
-        preserveConstEnums: true,
-        keepComments: true,
-        noResolve: false,
-        stripInternal: true
-    },
-            /*callback*/ function () {
-        jake.cpR(servicesFile, nodePackageFile, { silent: true });
-
-        prependFile(copyright, standaloneDefinitionsFile);
-
-        // Stanalone/web definition file using global 'ts' namespace
-        jake.cpR(standaloneDefinitionsFile, nodeDefinitionsFile, { silent: true });
-        var definitionFileContents = fs.readFileSync(nodeDefinitionsFile).toString();
-        definitionFileContents = removeConstModifierFromEnumDeclarations(definitionFileContents);
-        fs.writeFileSync(standaloneDefinitionsFile, definitionFileContents);
-
-        // Official node package definition file, pointed to by 'typings' in package.json
-        // Created by appending 'export = ts;' at the end of the standalone file to turn it into an external module
-        var nodeDefinitionsFileContents = definitionFileContents + "\nexport = ts;";
-        fs.writeFileSync(nodeDefinitionsFile, nodeDefinitionsFileContents);
-
-        // Node package definition file to be distributed without the package. Created by replacing
-        // 'ts' namespace with '"typescript"' as a module.
-        var nodeStandaloneDefinitionsFileContents = definitionFileContents.replace(/declare (namespace|module) ts/g, 'declare module "typescript"');
-        fs.writeFileSync(nodeStandaloneDefinitionsFile, nodeStandaloneDefinitionsFileContents);
-    });
-
-file(typescriptServicesDts, [servicesFile]);
-
-var cancellationTokenFile = path.join(builtLocalDirectory, "cancellationToken.js");
-compileFile(cancellationTokenFile, cancellationTokenSources, [builtLocalDirectory].concat(cancellationTokenSources), /*prefixes*/ [copyright], /*useBuiltCompiler*/ true, { types: ["node"], outDir: builtLocalDirectory, noOutFile: true, lib: "es6" });
-
-var typingsInstallerFile = path.join(builtLocalDirectory, "typingsInstaller.js");
-compileFile(typingsInstallerFile, typingsInstallerSources, [builtLocalDirectory].concat(typingsInstallerSources), /*prefixes*/ [copyright], /*useBuiltCompiler*/ true, { types: ["node"], outDir: builtLocalDirectory, noOutFile: false, lib: "es6" });
-
-var watchGuardFile = path.join(builtLocalDirectory, "watchGuard.js");
-compileFile(watchGuardFile, watchGuardSources, [builtLocalDirectory].concat(watchGuardSources), /*prefixes*/ [copyright], /*useBuiltCompiler*/ true, { types: ["node"], outDir: builtLocalDirectory, noOutFile: false, lib: "es6" });
-
-var serverFile = path.join(builtLocalDirectory, "tsserver.js");
-compileFile(serverFile, serverSources, [builtLocalDirectory, copyright, cancellationTokenFile, typingsInstallerFile, watchGuardFile].concat(serverSources).concat(servicesSources), /*prefixes*/ [copyright], /*useBuiltCompiler*/ true, { types: ["node"], preserveConstEnums: true, lib: "es6" });
-var tsserverLibraryFile = path.join(builtLocalDirectory, "tsserverlibrary.js");
-var tsserverLibraryDefinitionFile = path.join(builtLocalDirectory, "tsserverlibrary.d.ts");
-file(typesMapOutputPath, /** @type {*} */(function() {
-    var content = fs.readFileSync(path.join(serverDirectory, 'typesMap.json'));
-    // Validate that it's valid JSON
-    try {
-        JSON.parse(content.toString());
-    } catch (e) {
-        console.log("Parse error in typesMap.json: " + e);
-    }
-    fs.writeFileSync(typesMapOutputPath, content);
-}));
-compileFile(
-    tsserverLibraryFile,
-    languageServiceLibrarySources,
-    [builtLocalDirectory, copyright, builtLocalCompiler].concat(languageServiceLibrarySources).concat(libraryTargets),
-    /*prefixes*/[copyright],
-    /*useBuiltCompiler*/ true,
-    { noOutFile: false, generateDeclarations: true, stripInternal: true, preserveConstEnums: true, keepComments: true },
-    /*callback*/ function () {
-        prependFile(copyright, tsserverLibraryDefinitionFile);
-
-        // Appending exports at the end of the server library
-        var tsserverLibraryDefinitionFileContents =
-            fs.readFileSync(tsserverLibraryDefinitionFile).toString() +
-            "\nexport = ts;" +
-            "\nexport as namespace ts;";
-        tsserverLibraryDefinitionFileContents = removeConstModifierFromEnumDeclarations(tsserverLibraryDefinitionFileContents);
-
-        fs.writeFileSync(tsserverLibraryDefinitionFile, tsserverLibraryDefinitionFileContents);
-    });
-
-// Local target to build the language service server library
-desc("Builds language service server library");
-task("lssl", [tsserverLibraryFile, tsserverLibraryDefinitionFile, typesMapOutputPath]);
-
-desc("Emit the start of the build fold");
-task("build-fold-start", [], function () {
-    if (fold.isTravis()) console.log(fold.start("build"));
-});
-
-desc("Emit the end of the build fold");
-task("build-fold-end", [], function () {
-    if (fold.isTravis()) console.log(fold.end("build"));
-});
-
-// Local target to build the compiler and services
-desc("Builds the full compiler and services");
-task("local", ["build-fold-start", "generate-diagnostics", "lib", tscFile, servicesFile, nodeDefinitionsFile, serverFile, buildProtocolDts, builtGeneratedDiagnosticMessagesJSON, "lssl", "localize", "build-fold-end"]);
-
-// Local target to build only tsc.js
-desc("Builds only the compiler");
-task("tsc", ["generate-diagnostics", "lib", tscFile]);
-
-// Local target to build the compiler and services
-desc("Sets release mode flag");
-task("release", function () {
-    useDebugMode = false;
-});
-
-// Set the default task to "local"
-task("default", ["local"]);
-
-// Cleans the built directory
 desc("Cleans the compiler output, declare files, and tests");
 task("clean", function () {
-    jake.rmRf(builtDirectory);
+    jake.rmRf(Paths.built);;
 });
 
-// Generate Markdown spec
-var word2mdJs = path.join(scriptsDirectory, "word2md.js");
-var word2mdTs = path.join(scriptsDirectory, "word2md.ts");
-var specWord = path.join(docDirectory, "TypeScript Language Specification.docx");
-var specMd = path.join(docDirectory, "spec.md");
-
-file(word2mdTs);
-
-// word2md script
-compileFile(word2mdJs,
-    [word2mdTs],
-    [word2mdTs],
-    [],
-    /*useBuiltCompiler*/ false,
-    {
-        lib: "scripthost,es5"
-    });
-
-// The generated spec.md; built for the 'generate-spec' task
-file(specMd, [word2mdJs, specWord], function () {
-    var specWordFullPath = path.resolve(specWord);
-    var specMDFullPath = path.resolve(specMd);
-    var cmd = "cscript //nologo " + word2mdJs + ' "' + specWordFullPath + '" ' + '"' + specMDFullPath + '"';
-    console.log(cmd);
-    child_process.exec(cmd, function () {
-        complete();
-    });
-}, { async: true });
-
-
-desc("Generates a Markdown version of the Language Specification");
-task("generate-spec", [specMd]);
-
-
-// Makes a new LKG. This target does not build anything, but errors if not all the outputs are present in the built/local directory
-desc("Makes a new LKG out of the built js files");
-task("LKG", ["clean", "release", "local"].concat(libraryTargets), () => {
-    const sizeBefore = getDirSize(LKGDirectory);
-    var expectedFiles = [tscFile, servicesFile, serverFile, nodePackageFile, nodeDefinitionsFile, standaloneDefinitionsFile, tsserverLibraryFile, tsserverLibraryDefinitionFile, cancellationTokenFile, typingsInstallerFile, buildProtocolDts, watchGuardFile].
-        concat(libraryTargets).
-        concat(localizationTargets);
-    var missingFiles = expectedFiles.filter(f => !fs.existsSync(f));
-    if (missingFiles.length > 0) {
-        fail(new Error("Cannot replace the LKG unless all built targets are present in directory " + builtLocalDirectory +
-            ". The following files are missing:\n" + missingFiles.join("\n")));
-    }
-    // Copy all the targets into the LKG directory
-    jake.mkdirP(LKGDirectory);
-    expectedFiles.forEach(f => jake.cpR(f, LKGDirectory));
-
-    const sizeAfter = getDirSize(LKGDirectory);
-    if (sizeAfter > (sizeBefore * 1.10)) {
-        throw new Error("The lib folder increased by 10% or more. This likely indicates a bug.");
-    }
-});
-
-// Test directory
-directory(builtLocalDirectory);
-
-// Task to build the tests infrastructure using the built compiler
-var run = path.join(builtLocalDirectory, "run.js");
-compileFile(
-    /*outFile*/ run,
-    /*source*/ harnessSources,
-    /*prereqs*/[builtLocalDirectory, tscFile, tsserverLibraryFile].concat(libraryTargets).concat(servicesSources).concat(harnessSources),
-    /*prefixes*/[],
-    /*useBuiltCompiler:*/ true,
-    /*opts*/ { types: ["node", "mocha", "chai"], lib: "es6" });
-
-var internalTests = "internal/";
-
-var localBaseline = "tests/baselines/local/";
-var refBaseline = "tests/baselines/reference/";
-
-var localRwcBaseline = path.join(internalTests, "baselines/rwc/local");
-var refRwcBaseline = path.join(internalTests, "baselines/rwc/reference");
-
-var localTest262Baseline = path.join(internalTests, "baselines/test262/local");
-var refTest262Baseline = path.join(internalTests, "baselines/test262/reference");
-
-desc("Builds the test infrastructure using the built compiler");
-task("tests", ["local", run].concat(libraryTargets));
-
-function exec(cmd, completeHandler, errorHandler) {
-    var ex = jake.createExec([cmd], /** @type {jake.ExecOptions} */({ windowsVerbatimArguments: true, interactive: true }));
-    // Add listeners for output and error
-    ex.addListener("stdout", function (output) {
-        process.stdout.write(output);
-    });
-    ex.addListener("stderr", function (error) {
-        process.stderr.write(error);
-    });
-    ex.addListener("cmdEnd", function () {
-        if (completeHandler) {
-            completeHandler();
-        }
-        complete();
-    });
-    ex.addListener("error", function (e, status) {
-        if (errorHandler) {
-            errorHandler(e, status);
-        }
-        else {
-            fail("Process exited with code " + status);
-        }
-    });
-
-    ex.run();
-}
-
-const del = require("del");
-function cleanTestDirs() {
-    // Clean the local baselines directory
-    if (fs.existsSync(localBaseline)) {
-        del.sync(localBaseline);
-    }
-
-    // Clean the local Rwc baselines directory
-    if (fs.existsSync(localRwcBaseline)) {
-        del.sync(localRwcBaseline);
-    }
-
-    jake.mkdirP(localRwcBaseline);
-    jake.mkdirP(localTest262Baseline);
-    jake.mkdirP(localBaseline);
-}
-
-// used to pass data from jake command line directly to run.js
-function writeTestConfigFile(tests, runners, light, taskConfigsFolder, workerCount, stackTraceLimit, colors, testTimeout) {
-    var testConfigContents = JSON.stringify({
-        runners: runners ? runners.split(",") : undefined,
-        test: tests ? [tests] : undefined,
-        light: light,
-        workerCount: workerCount,
-        taskConfigsFolder: taskConfigsFolder,
-        stackTraceLimit: stackTraceLimit,
-        noColor: !colors,
-        timeout: testTimeout
-    });
-    fs.writeFileSync('test.config', testConfigContents);
-}
-
-function deleteTemporaryProjectOutput() {
-    if (fs.existsSync(path.join(localBaseline, "projectOutput/"))) {
-        jake.rmRf(path.join(localBaseline, "projectOutput/"));
-    }
-}
-
 function runConsoleTests(defaultReporter, runInParallel) {
     var dirty = process.env.dirty;
     if (!dirty) {
@@ -803,7 +115,7 @@ function runConsoleTests(defaultReporter, runInParallel) {
     // timeout normally isn't necessary but Travis-CI has been timing out on compiler baselines occasionally
     // default timeout is 2sec which really should be enough, but maybe we just need a small amount longer
     if (!runInParallel) {
-        var startTime = mark();
+        var startTime = Travis.mark();
         var args = [];
         args.push("-R", reporter);
         if (tests) {
@@ -827,7 +139,7 @@ function runConsoleTests(defaultReporter, runInParallel) {
         else {
             args.push("-t", testTimeout);
         }
-        args.push(run);
+        args.push(Paths.builtLocalRun);
 
         var cmd = "mocha " + args.join(" ");
         console.log(cmd);
@@ -836,12 +148,12 @@ function runConsoleTests(defaultReporter, runInParallel) {
         process.env.NODE_ENV = "development";
         exec(cmd, function () {
             process.env.NODE_ENV = savedNodeEnv;
-            measure(startTime);
+            Travis.measure(startTime);
             runLinter();
             finish();
         }, function (e, status) {
             process.env.NODE_ENV = savedNodeEnv;
-            measure(startTime);
+            Travis.measure(startTime);
             finish(status);
         });
 
@@ -849,15 +161,15 @@ function runConsoleTests(defaultReporter, runInParallel) {
     else {
         var savedNodeEnv = process.env.NODE_ENV;
         process.env.NODE_ENV = "development";
-        var startTime = mark();
+        var startTime = Travis.mark();
         exec(host + " " + run, function () {
             process.env.NODE_ENV = savedNodeEnv;
-            measure(startTime);
+            Travis.measure(startTime);
             runLinter();
             finish();
         }, function (e, status) {
             process.env.NODE_ENV = savedNodeEnv;
-            measure(startTime);
+            Travis.measure(startTime);
             finish(status);
         });
     }
@@ -885,245 +197,128 @@ function runConsoleTests(defaultReporter, runInParallel) {
         });
         lint.invoke();
     }
-}
 
-desc("Runs all the tests in parallel using the built run.js file. Optional arguments are: t[ests]=category1|category2|... d[ebug]=true.");
-task("runtests-parallel", ["build-rules", "tests", builtLocalDirectory], function () {
-    runConsoleTests('min', /*runInParallel*/ true);
-}, { async: true });
-
-desc("Runs the tests using the built run.js file. Optional arguments are: t[ests]=regex r[eporter]=[list|spec|json|<more>] d[ebug]=true color[s]=false lint=true bail=false dirty=false.");
-task("runtests", ["build-rules", "tests", builtLocalDirectory], function() {
-    runConsoleTests('mocha-fivemat-progress-reporter', /*runInParallel*/ false);
-}, { async: true });
-
-desc("Generates code coverage data via instanbul");
-task("generate-code-coverage", ["tests", builtLocalDirectory], function () {
-    var testTimeout = process.env.timeout || defaultTestTimeout;
-    var cmd = 'istanbul cover node_modules/mocha/bin/_mocha -- -R min -t ' + testTimeout + ' ' + run;
-    console.log(cmd);
-    exec(cmd);
-}, { async: true });
-
-// Browser tests
-var nodeServerOutFile = "tests/webTestServer.js";
-var nodeServerInFile = "tests/webTestServer.ts";
-compileFile(nodeServerOutFile, [nodeServerInFile], [builtLocalDirectory, tscFile], [], /*useBuiltCompiler:*/ true, { noOutFile: true, lib: "es6" });
-
-desc("Runs browserify on run.js to produce a file suitable for running tests in the browser");
-task("browserify", [], function() {
-    // Shell out to `gulp`, since we do the work to handle sourcemaps correctly w/o inline maps there
-    var cmd = 'gulp browserify --silent';
-    exec(cmd);
-}, { async: true });
-
-desc("Runs the tests using the built run.js file like 'jake runtests'. Syntax is jake runtests-browser. Additional optional parameters tests=[regex], browser=[chrome|IE]");
-task("runtests-browser", ["browserify", nodeServerOutFile], function () {
-    cleanTestDirs();
-    host = "node";
-    var browser = process.env.browser || process.env.b ||  (os.platform() === "win32" ? "edge" : "chrome");
-    var runners = process.env.runners || process.env.runner || process.env.ru;
-    var tests = process.env.test || process.env.tests || process.env.t;
-    var light = process.env.light || false;
-    var testConfigFile = 'test.config';
-    if (fs.existsSync(testConfigFile)) {
-        fs.unlinkSync(testConfigFile);
-    }
-    if (tests || runners || light) {
-        writeTestConfigFile(tests, runners, light);
+    // used to pass data from jake command line directly to run.js
+    function writeTestConfigFile(tests, runners, light, taskConfigsFolder, workerCount, stackTraceLimit, colors, testTimeout) {
+        var testConfigContents = JSON.stringify({
+            runners: runners ? runners.split(",") : undefined,
+            test: tests ? [tests] : undefined,
+            light: light,
+            workerCount: workerCount,
+            taskConfigsFolder: taskConfigsFolder,
+            stackTraceLimit: stackTraceLimit,
+            noColor: !colors,
+            timeout: testTimeout
+        });
+        fs.writeFileSync('test.config', testConfigContents);
     }
 
-    tests = tests ? tests : '';
-    var cmd = host + " tests/webTestServer.js " + browser + " " + JSON.stringify(tests);
-    console.log(cmd);
-    exec(cmd);
-}, { async: true });
-
-function getDiffTool() {
-    var program = process.env['DIFF'];
-    if (!program) {
-        fail("Add the 'DIFF' environment variable to the path of the program you want to use.");
-    }
-    return program;
-}
-
-// Baseline Diff
-desc("Diffs the compiler baselines using the diff tool specified by the 'DIFF' environment variable");
-task('diff', function () {
-    var cmd = '"' + getDiffTool() + '" ' + refBaseline + ' ' + localBaseline;
-    console.log(cmd);
-    exec(cmd);
-}, { async: true });
-
-desc("Diffs the RWC baselines using the diff tool specified by the 'DIFF' environment variable");
-task('diff-rwc', function () {
-    var cmd = '"' + getDiffTool() + '" ' + refRwcBaseline + ' ' + localRwcBaseline;
-    console.log(cmd);
-    exec(cmd);
-}, { async: true });
-
-desc("Builds the test sources and automation in debug mode");
-task("tests-debug", ["setDebugMode", "tests"]);
-
-
-// Makes the test results the new baseline
-desc("Makes the most recent test results the new baseline, overwriting the old baseline");
-task("baseline-accept", function () {
-    acceptBaseline(localBaseline, refBaseline);
-});
-
-function acceptBaseline(sourceFolder, targetFolder) {
-    console.log('Accept baselines from ' + sourceFolder + ' to ' + targetFolder);
-    var deleteEnding = '.delete';
-
-    acceptBaselineFolder(sourceFolder, targetFolder);
-
-    function acceptBaselineFolder(sourceFolder, targetFolder) {
-        var files = fs.readdirSync(sourceFolder);
-
-        for (var i in files) {
-            var filename = files[i];
-            var fullLocalPath = path.join(sourceFolder, filename);
-            var stat = fs.statSync(fullLocalPath);
-            if (stat.isFile()) {
-                if (filename.substr(filename.length - deleteEnding.length) === deleteEnding) {
-                    filename = filename.substr(0, filename.length - deleteEnding.length);
-                    fs.unlinkSync(path.join(targetFolder, filename));
-                }
-                else {
-                    var target = path.join(targetFolder, filename);
-                    if (fs.existsSync(target)) {
-                        fs.unlinkSync(target);
-                    }
-                    jake.mkdirP(path.dirname(target));
-                    fs.renameSync(path.join(sourceFolder, filename), target);
-                }
-            }
-            else if (stat.isDirectory()) {
-                acceptBaselineFolder(fullLocalPath, path.join(targetFolder, filename));
-            }
+    function deleteTemporaryProjectOutput() {
+        if (fs.existsSync(path.join(Paths.baselines.local, "projectOutput/"))) {
+            jake.rmRf(path.join(Paths.baselines.local, "projectOutput/"));
         }
     }
 }
 
-desc("Makes the most recent rwc test results the new baseline, overwriting the old baseline");
-task("baseline-accept-rwc", function () {
-    acceptBaseline(localRwcBaseline, refRwcBaseline);
-});
-
-desc("Makes the most recent test262 test results the new baseline, overwriting the old baseline");
-task("baseline-accept-test262", function () {
-    acceptBaseline(localTest262Baseline, refTest262Baseline);
-});
-
-
-// Webhost
-var webhostPath = "tests/webhost/webtsc.ts";
-var webhostJsPath = "tests/webhost/webtsc.js";
-compileFile(webhostJsPath, [webhostPath], [tscFile, webhostPath].concat(libraryTargets), [], /*useBuiltCompiler*/true);
-
-desc("Builds the tsc web host");
-task("webhost", [webhostJsPath], function () {
-    jake.cpR(path.join(builtLocalDirectory, "lib.d.ts"), "tests/webhost/", { silent: true });
-});
-
-// Perf compiler
-var perftscPath = "tests/perftsc.ts";
-var perftscJsPath = "built/local/perftsc.js";
-compileFile(perftscJsPath, [perftscPath], [tscFile, perftscPath, "tests/perfsys.ts"].concat(libraryTargets), [], /*useBuiltCompiler*/ true);
-desc("Builds augmented version of the compiler for perf tests");
-task("perftsc", [perftscJsPath]);
-
-// Instrumented compiler
-var loggedIOpath = harnessDirectory + 'loggedIO.ts';
-var loggedIOJsPath = builtLocalDirectory + 'loggedIO.js';
-file(loggedIOJsPath, [builtLocalDirectory, loggedIOpath], function () {
-    var temp = builtLocalDirectory + 'temp';
-    jake.mkdirP(temp);
-    var options = "--target es5 --lib es6 --types --outdir " + temp + ' ' + loggedIOpath;
-    var cmd = host + " " + LKGDirectory + compilerFilename + " " + options + " ";
-    console.log(cmd + "\n");
-    var ex = jake.createExec([cmd]);
-    ex.addListener("cmdEnd", function () {
-        fs.renameSync(temp + '/harness/loggedIO.js', loggedIOJsPath);
-        jake.rmRf(temp);
-        complete();
-    });
-    ex.run();
-}, { async: true });
-
-var instrumenterPath = harnessDirectory + 'instrumenter.ts';
-var instrumenterJsPath = builtLocalDirectory + 'instrumenter.js';
-compileFile(instrumenterJsPath, [instrumenterPath], [tscFile, instrumenterPath].concat(libraryTargets), [], /*useBuiltCompiler*/ true, { lib: "es6", types: ["node"], noOutFile: true, outDir: builtLocalDirectory });
-
-desc("Builds an instrumented tsc.js - run with test=[testname]");
-task('tsc-instrumented', [loggedIOJsPath, instrumenterJsPath, tscFile], function () {
-    var test = process.env.test || process.env.tests || process.env.t || "iocapture";
-    var cmd = host + ' ' + instrumenterJsPath + " record " + test + " " + builtLocalDirectory + compilerFilename;
-    console.log(cmd);
-    var ex = jake.createExec([cmd]);
-    ex.addListener("cmdEnd", function () {
-        complete();
-    });
-    ex.run();
-}, { async: true });
-
-desc("Updates the sublime plugin's tsserver");
-task("update-sublime", ["local", serverFile], function () {
-    jake.cpR(serverFile, "../TypeScript-Sublime-Plugin/tsserver/");
-    jake.cpR(serverFile + ".map", "../TypeScript-Sublime-Plugin/tsserver/");
-});
-
-var tslintRuleDir = "scripts/tslint/rules";
-var tslintRules = fs.readdirSync(tslintRuleDir);
-var tslintRulesFiles = tslintRules.map(function (p) {
-    return path.join(tslintRuleDir, p);
-});
-var tslintRulesOutFiles = tslintRules.map(function (p) {
-    return path.join(builtLocalDirectory, "tslint/rules", p.replace(".ts", ".js"));
-});
-var tslintFormattersDir = "scripts/tslint/formatters";
-var tslintFormatters = [
-    "autolinkableStylishFormatter",
-];
-var tslintFormatterFiles = tslintFormatters.map(function (p) {
-    return path.join(tslintFormattersDir, p + ".ts");
-});
-var tslintFormattersOutFiles = tslintFormatters.map(function (p) {
-    return path.join(builtLocalDirectory, "tslint/formatters", p + ".js");
-});
-desc("Compiles tslint rules to js");
-task("build-rules", ["build-rules-start"].concat(tslintRulesOutFiles).concat(tslintFormattersOutFiles).concat(["build-rules-end"]));
-tslintRulesFiles.forEach(function (ruleFile, i) {
-    compileFile(tslintRulesOutFiles[i], [ruleFile], [ruleFile], [], /*useBuiltCompiler*/ false,
-        { noOutFile: true, generateDeclarations: false, outDir: path.join(builtLocalDirectory, "tslint/rules"), lib: "es6" });
-});
-tslintFormatterFiles.forEach(function (ruleFile, i) {
-    compileFile(tslintFormattersOutFiles[i], [ruleFile], [ruleFile], [], /*useBuiltCompiler*/ false,
-        { noOutFile: true, generateDeclarations: false, outDir: path.join(builtLocalDirectory, "tslint/formatters"), lib: "es6" });
-});
-
-desc("Emit the start of the build-rules fold");
-task("build-rules-start", [], function () {
-    if (fold.isTravis()) console.log(fold.start("build-rules"));
-});
-
-desc("Emit the end of the build-rules fold");
-task("build-rules-end", [], function () {
-    if (fold.isTravis()) console.log(fold.end("build-rules"));
-});
-
-desc("Runs tslint on the compiler sources. Optional arguments are: f[iles]=regex");
-task("lint", ["build-rules"], () => {
-    if (fold.isTravis()) console.log(fold.start("lint"));
-    function lint(project, cb) {
-        const fix = process.env.fix || process.env.f;
-        const cmd = `node node_modules/tslint/bin/tslint --project ${project} --formatters-dir ./built/local/tslint/formatters --format autolinkableStylish${fix ? " --fix" : ""}`;
-        console.log("Linting: " + cmd);
-        jake.exec([cmd], cb, /** @type {jake.ExecOptions} */({ interactive: true, windowsVerbatimArguments: true }));
+function cleanTestDirs() {
+    // Clean the local baselines directory
+    if (fs.existsSync(Paths.baselines.local)) {
+        del.sync(Paths.baselines.local);
     }
-    lint("scripts/tslint/tsconfig.json", () => lint("src/tsconfig-base.json", () => {
-        if (fold.isTravis()) console.log(fold.end("lint"));
+
+    // Clean the local Rwc baselines directory
+    if (fs.existsSync(Paths.baselines.localRwc)) {
+        del.sync(Paths.baselines.localRwc);
+    }
+
+    jake.mkdirP(Paths.baselines.local);
+    jake.mkdirP(Paths.baselines.localRwc);
+    jake.mkdirP(Paths.baselines.localTest262);
+}
+
+function tsbuild(tsconfigPath, useLkg = false) {
+    const startCompileTime = Travis.mark();
+
+    const compilerPath = useLkg ? Paths.lkgCompiler : Paths.builtLocalCompiler;
+    const cmd = `${host} ${compilerPath} -b -v ${tsconfigPath}`;
+
+    var ex = jake.createExec([cmd]);
+    // Add listeners for output and error
+    ex.addListener("stdout", function (output) {
+        process.stdout.write(output);
+    });
+    ex.addListener("stderr", function (error) {
+        process.stderr.write(error);
+    });
+    ex.addListener("cmdEnd", function () {
+        /*
+        if (!useDebugMode && prefixes && fs.existsSync(outFile)) {
+            for (var i in prefixes) {
+                prependFile(prefixes[i], outFile);
+            }
+        }
+
+        if (callback) {
+            callback();
+        }
+        */
+
+        Travis.measure(startCompileTime);
         complete();
-    }));
-});
+    });
+    ex.addListener("error", function () {
+        fail(`Compilation of ${tsconfigPath} unsuccessful`);
+        Travis.measure(startCompileTime);
+    });
+    ex.run();
+}
+
+const Travis = {
+    mark() {
+        if (!fold.isTravis()) return;
+        var stamp = process.hrtime();
+        var id = Math.floor(Math.random() * 0xFFFFFFFF).toString(16);
+        console.log("travis_time:start:" + id + "\r");
+        return {
+            stamp: stamp,
+            id: id
+        };
+    },
+    measure(marker) {
+        if (!fold.isTravis()) return;
+        var diff = process.hrtime(marker.stamp);
+        var total = [marker.stamp[0] + diff[0], marker.stamp[1] + diff[1]];
+        console.log("travis_time:end:" + marker.id + ":start=" + toNs(marker.stamp) + ",finish=" + toNs(total) + ",duration=" + toNs(diff) + "\r");
+    }
+};
+
+function toNs(diff) {
+    return diff[0] * 1e9 + diff[1];
+}
+
+function exec(cmd, completeHandler, errorHandler) {
+    var ex = jake.createExec([cmd], /** @type {jake.ExecOptions} */({ windowsVerbatimArguments: true, interactive: true }));
+    // Add listeners for output and error
+    ex.addListener("stdout", function (output) {
+        process.stdout.write(output);
+    });
+    ex.addListener("stderr", function (error) {
+        process.stderr.write(error);
+    });
+    ex.addListener("cmdEnd", function () {
+        if (completeHandler) {
+            completeHandler();
+        }
+        complete();
+    });
+    ex.addListener("error", function (e, status) {
+        if (errorHandler) {
+            errorHandler(e, status);
+        }
+        else {
+            fail("Process exited with code " + status);
+        }
+    });
+
+    ex.run();
+}
\ No newline at end of file
diff --git a/scripts/tslint/tsconfig.json b/scripts/tslint/tsconfig.json
index 9d348658394..79ec67c3ad6 100644
--- a/scripts/tslint/tsconfig.json
+++ b/scripts/tslint/tsconfig.json
@@ -1,6 +1,8 @@
 {
 	"compilerOptions": {
 		"lib": ["es6"],
+		"sourceMap": false,
+		"declaration": false,
 		"noImplicitAny": true,
 		"noImplicitReturns": true,
 		"noImplicitThis": true,
diff --git a/src/built/local/cancellationToken.js b/src/built/local/cancellationToken.js
new file mode 100644
index 00000000000..5ead504797b
--- /dev/null
+++ b/src/built/local/cancellationToken.js
@@ -0,0 +1,57 @@
+"use strict";
+var fs = require("fs");
+function pipeExists(name) {
+    try {
+        fs.statSync(name);
+        return true;
+    }
+    catch (e) {
+        return false;
+    }
+}
+function createCancellationToken(args) {
+    var cancellationPipeName;
+    for (var i = 0; i < args.length - 1; i++) {
+        if (args[i] === "--cancellationPipeName") {
+            cancellationPipeName = args[i + 1];
+            break;
+        }
+    }
+    if (!cancellationPipeName) {
+        return {
+            isCancellationRequested: function () { return false; },
+            setRequest: function (_requestId) { return void 0; },
+            resetRequest: function (_requestId) { return void 0; }
+        };
+    }
+    if (cancellationPipeName.charAt(cancellationPipeName.length - 1) === "*") {
+        var namePrefix_1 = cancellationPipeName.slice(0, -1);
+        if (namePrefix_1.length === 0 || namePrefix_1.indexOf("*") >= 0) {
+            throw new Error("Invalid name for template cancellation pipe: it should have length greater than 2 characters and contain only one '*'.");
+        }
+        var perRequestPipeName_1;
+        var currentRequestId_1;
+        return {
+            isCancellationRequested: function () { return perRequestPipeName_1 !== undefined && pipeExists(perRequestPipeName_1); },
+            setRequest: function (requestId) {
+                currentRequestId_1 = requestId;
+                perRequestPipeName_1 = namePrefix_1 + requestId;
+            },
+            resetRequest: function (requestId) {
+                if (currentRequestId_1 !== requestId) {
+                    throw new Error("Mismatched request id, expected " + currentRequestId_1 + ", actual " + requestId);
+                }
+                perRequestPipeName_1 = undefined;
+            }
+        };
+    }
+    else {
+        return {
+            isCancellationRequested: function () { return pipeExists(cancellationPipeName); },
+            setRequest: function (_requestId) { return void 0; },
+            resetRequest: function (_requestId) { return void 0; }
+        };
+    }
+}
+module.exports = createCancellationToken;
+//# sourceMappingURL=cancellationToken.js.map
\ No newline at end of file
diff --git a/src/built/local/cancellationToken.js.map b/src/built/local/cancellationToken.js.map
new file mode 100644
index 00000000000..d8f1300682a
--- /dev/null
+++ b/src/built/local/cancellationToken.js.map
@@ -0,0 +1 @@
+{"version":3,"file":"cancellationToken.js","sourceRoot":"","sources":["../../cancellationToken/cancellationToken.ts"],"names":[],"mappings":";AAEA,uBAA0B;AAQ1B,oBAAoB,IAAY;IAC5B,IAAI;QACA,EAAE,CAAC,QAAQ,CAAC,IAAI,CAAC,CAAC;QAClB,OAAO,IAAI,CAAC;KACf;IACD,OAAO,CAAC,EAAE;QACN,OAAO,KAAK,CAAC;KAChB;AACL,CAAC;AAED,iCAAiC,IAAc;IAC3C,IAAI,oBAAwC,CAAC;IAC7C,KAAK,IAAI,CAAC,GAAG,CAAC,EAAE,CAAC,GAAG,IAAI,CAAC,MAAM,GAAG,CAAC,EAAE,CAAC,EAAE,EAAE;QACtC,IAAI,IAAI,CAAC,CAAC,CAAC,KAAK,wBAAwB,EAAE;YACtC,oBAAoB,GAAG,IAAI,CAAC,CAAC,GAAG,CAAC,CAAC,CAAC;YACnC,MAAM;SACT;KACJ;IACD,IAAI,CAAC,oBAAoB,EAAE;QACvB,OAAO;YACH,uBAAuB,EAAE,cAAM,OAAA,KAAK,EAAL,CAAK;YACpC,UAAU,EAAE,UAAC,UAAkB,IAAW,OAAA,KAAK,CAAC,EAAN,CAAM;YAChD,YAAY,EAAE,UAAC,UAAkB,IAAW,OAAA,KAAK,CAAC,EAAN,CAAM;SACrD,CAAC;KACL;IAMD,IAAI,oBAAoB,CAAC,MAAM,CAAC,oBAAoB,CAAC,MAAM,GAAG,CAAC,CAAC,KAAK,GAAG,EAAE;QACtE,IAAM,YAAU,GAAG,oBAAoB,CAAC,KAAK,CAAC,CAAC,EAAE,CAAC,CAAC,CAAC,CAAC;QACrD,IAAI,YAAU,CAAC,MAAM,KAAK,CAAC,IAAI,YAAU,CAAC,OAAO,CAAC,GAAG,CAAC,IAAI,CAAC,EAAE;YACzD,MAAM,IAAI,KAAK,CAAC,wHAAwH,CAAC,CAAC;SAC7I;QACD,IAAI,oBAAsC,CAAC;QAC3C,IAAI,kBAAwB,CAAC;QAC7B,OAAO;YACH,uBAAuB,EAAE,cAAM,OAAA,oBAAkB,KAAK,SAAS,IAAI,UAAU,CAAC,oBAAkB,CAAC,EAAlE,CAAkE;YACjG,UAAU,YAAC,SAAiB;gBACxB,kBAAgB,GAAG,SAAS,CAAC;gBAC7B,oBAAkB,GAAG,YAAU,GAAG,SAAS,CAAC;YAChD,CAAC;YACD,YAAY,YAAC,SAAiB;gBAC1B,IAAI,kBAAgB,KAAK,SAAS,EAAE;oBAChC,MAAM,IAAI,KAAK,CAAC,qCAAmC,kBAAgB,iBAAY,SAAW,CAAC,CAAC;iBAC/F;gBACD,oBAAkB,GAAG,SAAS,CAAC;YACnC,CAAC;SACJ,CAAC;KACL;SACI;QACD,OAAO;YACH,uBAAuB,EAAE,cAAM,OAAA,UAAU,CAAC,oBAAqB,CAAC,EAAjC,CAAiC;YAChE,UAAU,EAAE,UAAC,UAAkB,IAAW,OAAA,KAAK,CAAC,EAAN,CAAM;YAChD,YAAY,EAAE,UAAC,UAAkB,IAAW,OAAA,KAAK,CAAC,EAAN,CAAM;SACrD,CAAC;KACL;AACL,CAAC;AACD,iBAAS,uBAAuB,CAAC"}
\ No newline at end of file
diff --git a/src/built/local/harness.d.ts b/src/built/local/harness.d.ts
new file mode 100644
index 00000000000..04c03214347
--- /dev/null
+++ b/src/built/local/harness.d.ts
@@ -0,0 +1,2223 @@
+/// <reference types="node" />
+/// <reference types="chai" />
+declare namespace collections {
+    interface SortOptions<T> {
+        comparer: (a: T, b: T) => number;
+        sort: "insertion" | "comparison";
+    }
+    class SortedMap<K, V> {
+        private _comparer;
+        private _keys;
+        private _values;
+        private _order;
+        private _version;
+        private _copyOnWrite;
+        constructor(comparer: ((a: K, b: K) => number) | SortOptions<K>, iterable?: Iterable<[K, V]>);
+        readonly size: number;
+        readonly comparer: (a: K, b: K) => number;
+        readonly [Symbol.toStringTag]: string;
+        has(key: K): boolean;
+        get(key: K): V | undefined;
+        set(key: K, value: V): this;
+        delete(key: K): boolean;
+        clear(): void;
+        forEach(callback: (value: V, key: K, collection: this) => void, thisArg?: any): void;
+        keys(): IterableIterator<K>;
+        values(): IterableIterator<V>;
+        entries(): IterableIterator<[K, V]>;
+        [Symbol.iterator](): IterableIterator<[K, V]>;
+        private writePreamble;
+        private writePostScript;
+        private getIterationOrder;
+    }
+    function insertAt<T>(array: T[], index: number, value: T): void;
+    function getIterator<T>(iterable: Iterable<T>): Iterator<T>;
+    function nextResult<T>(iterator: Iterator<T>): IteratorResult<T> | undefined;
+    function closeIterator<T>(iterator: Iterator<T>): void;
+    /**
+     * A collection of metadata that supports inheritance.
+     */
+    class Metadata {
+        private static readonly _undefinedValue;
+        private _parent;
+        private _map;
+        private _version;
+        private _size;
+        private _parentVersion;
+        constructor(parent?: Metadata);
+        readonly size: number;
+        readonly parent: Metadata | undefined;
+        has(key: string): boolean;
+        get(key: string): any;
+        set(key: string, value: any): this;
+        delete(key: string): boolean;
+        clear(): void;
+        forEach(callback: (value: any, key: string, map: this) => void): void;
+        private static _escapeKey;
+        private static _unescapeKey;
+    }
+}
+/**
+ * Common utilities
+ */
+declare namespace utils {
+    function removeTestPathPrefixes(text: string, retainTrailingDirectorySeparator?: boolean): string;
+    /**
+     * Removes leading indentation from a template literal string.
+     */
+    function dedent(array: TemplateStringsArray, ...args: any[]): string;
+    function toUtf8(text: string): string;
+    function getByteOrderMarkLength(text: string): number;
+    function removeByteOrderMark(text: string): string;
+    function addUTF8ByteOrderMark(text: string): string;
+}
+declare namespace documents {
+    class TextDocument {
+        readonly meta: Map<string, string>;
+        readonly file: string;
+        readonly text: string;
+        private _lineStarts;
+        private _testFile;
+        constructor(file: string, text: string, meta?: Map<string, string>);
+        readonly lineStarts: ReadonlyArray<number>;
+        static fromTestFile(file: Harness.Compiler.TestFile): TextDocument;
+        asTestFile(): Harness.Compiler.TestFile;
+    }
+    interface RawSourceMap {
+        version: number;
+        file: string;
+        sourceRoot?: string;
+        sources: string[];
+        sourcesContent?: string[];
+        names: string[];
+        mappings: string;
+    }
+    interface Mapping {
+        mappingIndex: number;
+        emittedLine: number;
+        emittedColumn: number;
+        sourceIndex: number;
+        sourceLine: number;
+        sourceColumn: number;
+        nameIndex?: number;
+    }
+    class SourceMap {
+        readonly raw: RawSourceMap;
+        readonly mapFile: string | undefined;
+        readonly version: number;
+        readonly file: string;
+        readonly sourceRoot: string | undefined;
+        readonly sources: ReadonlyArray<string>;
+        readonly sourcesContent: ReadonlyArray<string> | undefined;
+        readonly mappings: ReadonlyArray<Mapping>;
+        readonly names: ReadonlyArray<string> | undefined;
+        private static readonly _mappingRegExp;
+        private static readonly _sourceMappingURLRegExp;
+        private static readonly _dataURLRegExp;
+        private static readonly _base64Chars;
+        private _emittedLineMappings;
+        private _sourceLineMappings;
+        constructor(mapFile: string | undefined, data: string | RawSourceMap);
+        static getUrl(text: string): string | undefined;
+        static fromUrl(url: string): SourceMap | undefined;
+        static fromSource(text: string): SourceMap | undefined;
+        getMappingsForEmittedLine(emittedLine: number): ReadonlyArray<Mapping> | undefined;
+        getMappingsForSourceLine(sourceIndex: number, sourceLine: number): ReadonlyArray<Mapping> | undefined;
+        private static _decodeVLQ;
+    }
+}
+declare namespace vpath {
+    export import sep = ts.directorySeparator;
+    export import normalizeSeparators = ts.normalizeSlashes;
+    export import isAbsolute = ts.isRootedDiskPath;
+    export import isRoot = ts.isDiskPathRoot;
+    export import hasTrailingSeparator = ts.hasTrailingDirectorySeparator;
+    export import addTrailingSeparator = ts.ensureTrailingDirectorySeparator;
+    export import removeTrailingSeparator = ts.removeTrailingDirectorySeparator;
+    export import normalize = ts.normalizePath;
+    export import combine = ts.combinePaths;
+    export import parse = ts.getPathComponents;
+    export import reduce = ts.reducePathComponents;
+    export import format = ts.getPathFromPathComponents;
+    export import resolve = ts.resolvePath;
+    export import compare = ts.comparePaths;
+    export import compareCaseSensitive = ts.comparePathsCaseSensitive;
+    export import compareCaseInsensitive = ts.comparePathsCaseInsensitive;
+    export import dirname = ts.getDirectoryPath;
+    export import basename = ts.getBaseFileName;
+    export import extname = ts.getAnyExtensionFromPath;
+    export import relative = ts.getRelativePathFromDirectory;
+    export import beneath = ts.containsPath;
+    export import changeExtension = ts.changeAnyExtension;
+    export import isTypeScript = ts.hasTypeScriptFileExtension;
+    export import isJavaScript = ts.hasJavaScriptFileExtension;
+    const enum ValidationFlags {
+        None = 0,
+        RequireRoot = 1,
+        RequireDirname = 2,
+        RequireBasename = 4,
+        RequireExtname = 8,
+        RequireTrailingSeparator = 16,
+        AllowRoot = 32,
+        AllowDirname = 64,
+        AllowBasename = 128,
+        AllowExtname = 256,
+        AllowTrailingSeparator = 512,
+        AllowNavigation = 1024,
+        AllowWildcard = 2048,
+        /** Path must be a valid directory root */
+        Root = 545,
+        /** Path must be a absolute */
+        Absolute = 2017,
+        /** Path may be relative or absolute */
+        RelativeOrAbsolute = 2016,
+        /** Path may only be a filename */
+        Basename = 260
+    }
+    function validate(path: string, flags?: ValidationFlags): string;
+    function isDeclaration(path: string): boolean;
+    function isSourceMap(path: string): boolean;
+    function isJavaScriptSourceMap(path: string): boolean;
+    function isJson(path: string): boolean;
+    function isDefaultLibrary(path: string): boolean;
+    function isTsConfigFile(path: string): boolean;
+}
+declare namespace vfs {
+    /**
+     * Posix-style path to the TypeScript compiler build outputs (including tsc.js, lib.d.ts, etc.)
+     */
+    const builtFolder = "/.ts";
+    /**
+     * Posix-style path to additional mountable folders (./tests/projects in this repo)
+     */
+    const projectsFolder = "/.projects";
+    /**
+     * Posix-style path to additional test libraries
+     */
+    const testLibFolder = "/.lib";
+    /**
+     * Posix-style path to sources under test
+     */
+    const srcFolder = "/.src";
+    /**
+     * Represents a virtual POSIX-like file system.
+     */
+    class FileSystem {
+        /** Indicates whether the file system is case-sensitive (`false`) or case-insensitive (`true`). */
+        readonly ignoreCase: boolean;
+        /** Gets the comparison function used to compare two paths. */
+        readonly stringComparer: (a: string, b: string) => number;
+        private _lazy;
+        private _cwd;
+        private _time;
+        private _shadowRoot;
+        private _dirStack;
+        constructor(ignoreCase: boolean, options?: FileSystemOptions);
+        /**
+         * Gets metadata for this `FileSystem`.
+         */
+        readonly meta: collections.Metadata;
+        /**
+         * Gets a value indicating whether the file system is read-only.
+         */
+        readonly isReadonly: boolean;
+        /**
+         * Makes the file system read-only.
+         */
+        makeReadonly(): this;
+        /**
+         * Gets the file system shadowed by this file system.
+         */
+        readonly shadowRoot: FileSystem | undefined;
+        /**
+         * Gets a shadow copy of this file system. Changes to the shadow copy do not affect the
+         * original, allowing multiple copies of the same core file system without multiple copies
+         * of the same data.
+         */
+        shadow(ignoreCase?: boolean): FileSystem;
+        /**
+         * Gets or sets the timestamp (in milliseconds) used for file status, returning the previous timestamp.
+         *
+         * @link http://pubs.opengroup.org/onlinepubs/9699919799/functions/time.html
+         */
+        time(value?: number | Date | (() => number | Date)): number;
+        /**
+         * Gets the metadata object for a path.
+         * @param path
+         */
+        filemeta(path: string): collections.Metadata;
+        private _filemeta;
+        /**
+         * Get the pathname of the current working directory.
+         *
+         * @link - http://pubs.opengroup.org/onlinepubs/9699919799/functions/getcwd.html
+         */
+        cwd(): string;
+        /**
+         * Changes the current working directory.
+         *
+         * @link http://pubs.opengroup.org/onlinepubs/9699919799/functions/chdir.html
+         */
+        chdir(path: string): void;
+        /**
+         * Pushes the current directory onto the directory stack and changes the current working directory to the supplied path.
+         */
+        pushd(path?: string): void;
+        /**
+         * Pops the previous directory from the location stack and changes the current directory to that directory.
+         */
+        popd(): void;
+        /**
+         * Update the file system with a set of files.
+         */
+        apply(files: FileSet): void;
+        /**
+         * Scan file system entries along a path. If `path` is a symbolic link, it is dereferenced.
+         * @param path The path at which to start the scan.
+         * @param axis The axis along which to traverse.
+         * @param traversal The traversal scheme to use.
+         */
+        scanSync(path: string, axis: Axis, traversal: Traversal): string[];
+        /**
+         * Scan file system entries along a path.
+         * @param path The path at which to start the scan.
+         * @param axis The axis along which to traverse.
+         * @param traversal The traversal scheme to use.
+         */
+        lscanSync(path: string, axis: Axis, traversal: Traversal): string[];
+        private _scan;
+        /**
+         * Mounts a physical or virtual file system at a location in this virtual file system.
+         *
+         * @param source The path in the physical (or other virtual) file system.
+         * @param target The path in this virtual file system.
+         * @param resolver An object used to resolve files in `source`.
+         */
+        mountSync(source: string, target: string, resolver: FileSystemResolver): void;
+        /**
+         * Recursively remove all files and directories underneath the provided path.
+         */
+        rimrafSync(path: string): void;
+        /**
+         * Make a directory and all of its parent paths (if they don't exist).
+         */
+        mkdirpSync(path: string): void;
+        getFileListing(): string;
+        /**
+         * Print diagnostic information about the structure of the file system to the console.
+         */
+        debugPrint(): void;
+        /**
+         * Determines whether a path exists.
+         */
+        existsSync(path: string): boolean;
+        /**
+         * Get file status. If `path` is a symbolic link, it is dereferenced.
+         *
+         * @link http://pubs.opengroup.org/onlinepubs/9699919799/functions/stat.html
+         *
+         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
+         */
+        statSync(path: string): Stats;
+        /**
+         * Change file access times
+         *
+         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
+         */
+        utimesSync(path: string, atime: Date, mtime: Date): void;
+        /**
+         * Get file status. If `path` is a symbolic link, it is dereferenced.
+         *
+         * @link http://pubs.opengroup.org/onlinepubs/9699919799/functions/lstat.html
+         *
+         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
+         */
+        lstatSync(path: string): Stats;
+        private _stat;
+        /**
+         * Read a directory. If `path` is a symbolic link, it is dereferenced.
+         *
+         * @link http://pubs.opengroup.org/onlinepubs/9699919799/functions/readdir.html
+         *
+         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
+         */
+        readdirSync(path: string): string[];
+        /**
+         * Make a directory.
+         *
+         * @link http://pubs.opengroup.org/onlinepubs/9699919799/functions/mkdir.html
+         *
+         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
+         */
+        mkdirSync(path: string): void;
+        private _mkdir;
+        /**
+         * Remove a directory.
+         *
+         * @link http://pubs.opengroup.org/onlinepubs/9699919799/functions/rmdir.html
+         *
+         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
+         */
+        rmdirSync(path: string): void;
+        /**
+         * Link one file to another file (also known as a "hard link").
+         *
+         * @link http://pubs.opengroup.org/onlinepubs/9699919799/functions/link.html
+         *
+         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
+         */
+        linkSync(oldpath: string, newpath: string): void;
+        /**
+         * Remove a directory entry.
+         *
+         * @link http://pubs.opengroup.org/onlinepubs/9699919799/functions/unlink.html
+         *
+         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
+         */
+        unlinkSync(path: string): void;
+        /**
+         * Rename a file.
+         *
+         * @link http://pubs.opengroup.org/onlinepubs/9699919799/functions/rename.html
+         *
+         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
+         */
+        renameSync(oldpath: string, newpath: string): void;
+        /**
+         * Make a symbolic link.
+         *
+         * @link http://pubs.opengroup.org/onlinepubs/9699919799/functions/symlink.html
+         *
+         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
+         */
+        symlinkSync(target: string, linkpath: string): void;
+        /**
+         * Resolve a pathname.
+         *
+         * @link http://pubs.opengroup.org/onlinepubs/9699919799/functions/realpath.html
+         *
+         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
+         */
+        realpathSync(path: string): string;
+        /**
+         * Read from a file.
+         *
+         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
+         */
+        readFileSync(path: string, encoding?: null): Buffer;
+        /**
+         * Read from a file.
+         *
+         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
+         */
+        readFileSync(path: string, encoding: string): string;
+        /**
+         * Read from a file.
+         *
+         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
+         */
+        readFileSync(path: string, encoding?: string | null): string | Buffer;
+        /**
+         * Write to a file.
+         *
+         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
+         */
+        writeFileSync(path: string, data: string | Buffer, encoding?: string | null): void;
+        private _mknod;
+        private _addLink;
+        private _removeLink;
+        private _replaceLink;
+        private _getRootLinks;
+        private _getLinks;
+        private _getShadow;
+        private _copyShadowLinks;
+        private _getSize;
+        private _getBuffer;
+        /**
+         * Walk a path to its end.
+         *
+         * @param path The path to follow.
+         * @param noFollow A value indicating whether to *not* dereference a symbolic link at the
+         * end of a path.
+         *
+         * @link http://man7.org/linux/man-pages/man7/path_resolution.7.html
+         */
+        private _walk;
+        /**
+         * Resolve a path relative to the current working directory.
+         */
+        private _resolve;
+        private _applyFiles;
+        private _applyFileExtendedOptions;
+        private _applyFilesWorker;
+        private _normalizeFileSetEntry;
+    }
+    interface FileSystemOptions {
+        time?: number | Date | (() => number | Date);
+        files?: FileSet;
+        cwd?: string;
+        meta?: Record<string, any>;
+    }
+    interface FileSystemCreateOptions {
+        documents?: ReadonlyArray<documents.TextDocument>;
+        cwd?: string;
+    }
+    type Axis = "ancestors" | "ancestors-or-self" | "self" | "descendants-or-self" | "descendants";
+    interface Traversal {
+        /** A function called to choose whether to continue to traverse to either ancestors or descendants. */
+        traverse?(path: string, stats: Stats): boolean;
+        /** A function called to choose whether to accept a path as part of the result. */
+        accept?(path: string, stats: Stats): boolean;
+    }
+    interface FileSystemResolver {
+        statSync(path: string): {
+            mode: number;
+            size: number;
+        };
+        readdirSync(path: string): string[];
+        readFileSync(path: string): Buffer;
+    }
+    interface FileSystemResolverHost {
+        useCaseSensitiveFileNames(): boolean;
+        getAccessibleFileSystemEntries(path: string): ts.FileSystemEntries;
+        directoryExists(path: string): boolean;
+        fileExists(path: string): boolean;
+        getFileSize(path: string): number;
+        readFile(path: string): string | undefined;
+        getWorkspaceRoot(): string;
+    }
+    function createResolver(host: FileSystemResolverHost): FileSystemResolver;
+    /**
+     * Create a virtual file system from a physical file system using the following path mappings:
+     *
+     *  - `/.ts` is a directory mapped to `${workspaceRoot}/built/local`
+     *  - `/.lib` is a directory mapped to `${workspaceRoot}/tests/lib`
+     *  - `/.src` is a virtual directory to be used for tests.
+     *
+     * Unless overridden, `/.src` will be the current working directory for the virtual file system.
+     */
+    function createFromFileSystem(host: FileSystemResolverHost, ignoreCase: boolean, { documents, cwd }?: FileSystemCreateOptions): FileSystem;
+    class Stats {
+        dev: number;
+        ino: number;
+        mode: number;
+        nlink: number;
+        uid: number;
+        gid: number;
+        rdev: number;
+        size: number;
+        blksize: number;
+        blocks: number;
+        atimeMs: number;
+        mtimeMs: number;
+        ctimeMs: number;
+        birthtimeMs: number;
+        atime: Date;
+        mtime: Date;
+        ctime: Date;
+        birthtime: Date;
+        constructor();
+        constructor(dev: number, ino: number, mode: number, nlink: number, rdev: number, size: number, blksize: number, blocks: number, atimeMs: number, mtimeMs: number, ctimeMs: number, birthtimeMs: number);
+        isFile(): boolean;
+        isDirectory(): boolean;
+        isSymbolicLink(): boolean;
+        isBlockDevice(): boolean;
+        isCharacterDevice(): boolean;
+        isFIFO(): boolean;
+        isSocket(): boolean;
+    }
+    const IOErrorMessages: Readonly<{
+        EACCES: string;
+        EIO: string;
+        ENOENT: string;
+        EEXIST: string;
+        ELOOP: string;
+        ENOTDIR: string;
+        EISDIR: string;
+        EBADF: string;
+        EINVAL: string;
+        ENOTEMPTY: string;
+        EPERM: string;
+        EROFS: string;
+    }>;
+    function createIOError(code: keyof typeof IOErrorMessages, details?: string): NodeJS.ErrnoException;
+    /**
+     * A template used to populate files, directories, links, etc. in a virtual file system.
+     */
+    interface FileSet {
+        [name: string]: DirectoryLike | FileLike | Link | Symlink | Mount | null | undefined;
+    }
+    type DirectoryLike = FileSet | Directory;
+    type FileLike = File | Buffer | string;
+    /** Extended options for a directory in a `FileSet` */
+    class Directory {
+        readonly files: FileSet;
+        readonly meta: Record<string, any> | undefined;
+        constructor(files: FileSet, { meta }?: {
+            meta?: Record<string, any>;
+        });
+    }
+    /** Extended options for a file in a `FileSet` */
+    class File {
+        readonly data: Buffer | string;
+        readonly encoding: string | undefined;
+        readonly meta: Record<string, any> | undefined;
+        constructor(data: Buffer | string, { meta, encoding }?: {
+            encoding?: string;
+            meta?: Record<string, any>;
+        });
+    }
+    /** Extended options for a hard link in a `FileSet` */
+    class Link {
+        readonly path: string;
+        constructor(path: string);
+    }
+    /** Extended options for a symbolic link in a `FileSet` */
+    class Symlink {
+        readonly symlink: string;
+        readonly meta: Record<string, any> | undefined;
+        constructor(symlink: string, { meta }?: {
+            meta?: Record<string, any>;
+        });
+    }
+    /** Extended options for mounting a virtual copy of an external file system via a `FileSet` */
+    class Mount {
+        readonly source: string;
+        readonly resolver: FileSystemResolver;
+        readonly meta: Record<string, any> | undefined;
+        constructor(source: string, resolver: FileSystemResolver, { meta }?: {
+            meta?: Record<string, any>;
+        });
+    }
+}
+/**
+ * Test harness compiler functionality.
+ */
+declare namespace compiler {
+    interface Project {
+        file: string;
+        config?: ts.ParsedCommandLine;
+        errors?: ts.Diagnostic[];
+    }
+    function readProject(host: fakes.ParseConfigHost, project: string | undefined, existingOptions?: ts.CompilerOptions): Project | undefined;
+    /**
+     * Correlates compilation inputs and outputs
+     */
+    interface CompilationOutput {
+        readonly inputs: ReadonlyArray<documents.TextDocument>;
+        readonly js: documents.TextDocument | undefined;
+        readonly dts: documents.TextDocument | undefined;
+        readonly map: documents.TextDocument | undefined;
+    }
+    class CompilationResult {
+        readonly host: fakes.CompilerHost;
+        readonly program: ts.Program | undefined;
+        readonly result: ts.EmitResult | undefined;
+        readonly options: ts.CompilerOptions;
+        readonly diagnostics: ReadonlyArray<ts.Diagnostic>;
+        readonly js: ReadonlyMap<string, documents.TextDocument>;
+        readonly dts: ReadonlyMap<string, documents.TextDocument>;
+        readonly maps: ReadonlyMap<string, documents.TextDocument>;
+        private _inputs;
+        private _inputsAndOutputs;
+        constructor(host: fakes.CompilerHost, options: ts.CompilerOptions, program: ts.Program | undefined, result: ts.EmitResult | undefined, diagnostics: ts.Diagnostic[]);
+        readonly vfs: vfs.FileSystem;
+        readonly inputs: ReadonlyArray<documents.TextDocument>;
+        readonly outputs: ReadonlyArray<documents.TextDocument>;
+        readonly traces: ReadonlyArray<string>;
+        readonly emitSkipped: boolean;
+        readonly singleFile: boolean;
+        readonly commonSourceDirectory: string;
+        getInputsAndOutputs(path: string): CompilationOutput | undefined;
+        getInputs(path: string): ReadonlyArray<documents.TextDocument> | undefined;
+        getOutput(path: string, kind: "js" | "dts" | "map"): documents.TextDocument | undefined;
+        getSourceMapRecord(): string | undefined;
+        getSourceMap(path: string): documents.SourceMap | undefined;
+        getOutputPath(path: string, ext: string): string;
+        getNumberOfJsFiles(): number;
+    }
+    function compileFiles(host: fakes.CompilerHost, rootFiles: string[] | undefined, compilerOptions: ts.CompilerOptions): CompilationResult;
+}
+declare namespace evaluator {
+    function evaluateTypeScript(sourceText: string, options?: ts.CompilerOptions, globals?: Record<string, any>): any;
+}
+/**
+ * Fake implementations of various compiler dependencies.
+ */
+declare namespace fakes {
+    interface SystemOptions {
+        executingFilePath?: string;
+        newLine?: "\r\n" | "\n";
+        env?: Record<string, string>;
+    }
+    /**
+     * A fake `ts.System` that leverages a virtual file system.
+     */
+    class System implements ts.System {
+        readonly vfs: vfs.FileSystem;
+        readonly args: string[];
+        readonly output: string[];
+        readonly newLine: string;
+        readonly useCaseSensitiveFileNames: boolean;
+        exitCode: number | undefined;
+        private readonly _executingFilePath;
+        private readonly _env;
+        constructor(vfs: vfs.FileSystem, { executingFilePath, newLine, env }?: SystemOptions);
+        write(message: string): void;
+        readFile(path: string): string | undefined;
+        writeFile(path: string, data: string, writeByteOrderMark?: boolean): void;
+        deleteFile(path: string): void;
+        fileExists(path: string): boolean;
+        directoryExists(path: string): boolean;
+        createDirectory(path: string): void;
+        getCurrentDirectory(): string;
+        getDirectories(path: string): string[];
+        readDirectory(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
+        getAccessibleFileSystemEntries(path: string): ts.FileSystemEntries;
+        exit(exitCode?: number): void;
+        getFileSize(path: string): number;
+        resolvePath(path: string): string;
+        getExecutingFilePath(): string;
+        getModifiedTime(path: string): Date;
+        setModifiedTime(path: string, time: Date): void;
+        createHash(data: string): string;
+        realpath(path: string): string;
+        getEnvironmentVariable(name: string): string;
+        private _getStats;
+    }
+    /**
+     * A fake `ts.ParseConfigHost` that leverages a virtual file system.
+     */
+    class ParseConfigHost implements ts.ParseConfigHost {
+        readonly sys: System;
+        constructor(sys: System | vfs.FileSystem);
+        readonly vfs: vfs.FileSystem;
+        readonly useCaseSensitiveFileNames: boolean;
+        fileExists(fileName: string): boolean;
+        directoryExists(directoryName: string): boolean;
+        readFile(path: string): string | undefined;
+        readDirectory(path: string, extensions: string[], excludes: string[], includes: string[], depth: number): string[];
+    }
+    /**
+     * A fake `ts.CompilerHost` that leverages a virtual file system.
+     */
+    class CompilerHost implements ts.CompilerHost {
+        readonly sys: System;
+        readonly defaultLibLocation: string;
+        readonly outputs: documents.TextDocument[];
+        private readonly _outputsMap;
+        readonly traces: string[];
+        readonly shouldAssertInvariants: boolean;
+        private _setParentNodes;
+        private _sourceFiles;
+        private _parseConfigHost;
+        private _newLine;
+        constructor(sys: System | vfs.FileSystem, options?: ts.CompilerOptions, setParentNodes?: boolean);
+        readonly vfs: vfs.FileSystem;
+        readonly parseConfigHost: ParseConfigHost;
+        getCurrentDirectory(): string;
+        useCaseSensitiveFileNames(): boolean;
+        getNewLine(): string;
+        getCanonicalFileName(fileName: string): string;
+        deleteFile(fileName: string): void;
+        fileExists(fileName: string): boolean;
+        directoryExists(directoryName: string): boolean;
+        getModifiedTime(fileName: string): Date;
+        setModifiedTime(fileName: string, time: Date): void;
+        getDirectories(path: string): string[];
+        readDirectory(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
+        readFile(path: string): string | undefined;
+        writeFile(fileName: string, content: string, writeByteOrderMark: boolean): void;
+        trace(s: string): void;
+        realpath(path: string): string;
+        getDefaultLibLocation(): string;
+        getDefaultLibFileName(options: ts.CompilerOptions): string;
+        getSourceFile(fileName: string, languageVersion: number): ts.SourceFile | undefined;
+    }
+}
+declare namespace ts.server {
+    interface SessionClientHost extends LanguageServiceHost {
+        writeMessage(message: string): void;
+    }
+    function extractMessage(message: string): string;
+    class SessionClient implements LanguageService {
+        private host;
+        private sequence;
+        private lineMaps;
+        private messages;
+        private lastRenameEntry;
+        constructor(host: SessionClientHost);
+        onMessage(message: string): void;
+        private writeMessage;
+        private getLineMap;
+        private lineOffsetToPosition;
+        private positionToOneBasedLineOffset;
+        private convertCodeEditsToTextChange;
+        private processRequest;
+        private processResponse;
+        openFile(file: string, fileContent?: string, scriptKindName?: "TS" | "JS" | "TSX" | "JSX"): void;
+        closeFile(file: string): void;
+        changeFile(fileName: string, start: number, end: number, insertString: string): void;
+        toLineColumnOffset(fileName: string, position: number): {
+            line: number;
+            character: number;
+        };
+        getQuickInfoAtPosition(fileName: string, position: number): QuickInfo;
+        getProjectInfo(file: string, needFileNameList: boolean): protocol.ProjectInfo;
+        getCompletionsAtPosition(fileName: string, position: number, _preferences: UserPreferences | undefined): CompletionInfo;
+        getCompletionEntryDetails(fileName: string, position: number, entryName: string, _options: FormatCodeOptions | FormatCodeSettings | undefined, source: string | undefined): CompletionEntryDetails;
+        getCompletionEntrySymbol(_fileName: string, _position: number, _entryName: string): Symbol;
+        getNavigateToItems(searchValue: string): NavigateToItem[];
+        getFormattingEditsForRange(file: string, start: number, end: number, _options: FormatCodeOptions): TextChange[];
+        getFormattingEditsForDocument(fileName: string, options: FormatCodeOptions): TextChange[];
+        getFormattingEditsAfterKeystroke(fileName: string, position: number, key: string, _options: FormatCodeOptions): TextChange[];
+        getDefinitionAtPosition(fileName: string, position: number): DefinitionInfo[];
+        getDefinitionAndBoundSpan(fileName: string, position: number): DefinitionInfoAndBoundSpan;
+        getTypeDefinitionAtPosition(fileName: string, position: number): DefinitionInfo[];
+        getImplementationAtPosition(fileName: string, position: number): ImplementationLocation[];
+        findReferences(_fileName: string, _position: number): ReferencedSymbol[];
+        getReferencesAtPosition(fileName: string, position: number): ReferenceEntry[];
+        getEmitOutput(_fileName: string): EmitOutput;
+        getSyntacticDiagnostics(file: string): DiagnosticWithLocation[];
+        getSemanticDiagnostics(file: string): Diagnostic[];
+        getSuggestionDiagnostics(file: string): DiagnosticWithLocation[];
+        private getDiagnostics;
+        getCompilerOptionsDiagnostics(): Diagnostic[];
+        getRenameInfo(fileName: string, position: number, findInStrings?: boolean, findInComments?: boolean): RenameInfo;
+        findRenameLocations(fileName: string, position: number, findInStrings: boolean, findInComments: boolean): RenameLocation[];
+        private decodeNavigationBarItems;
+        getNavigationBarItems(file: string): NavigationBarItem[];
+        private decodeNavigationTree;
+        getNavigationTree(file: string): NavigationTree;
+        private decodeSpan;
+        getNameOrDottedNameSpan(_fileName: string, _startPos: number, _endPos: number): TextSpan;
+        getBreakpointStatementAtPosition(_fileName: string, _position: number): TextSpan;
+        getSignatureHelpItems(fileName: string, position: number): SignatureHelpItems;
+        getOccurrencesAtPosition(fileName: string, position: number): ReferenceEntry[];
+        getDocumentHighlights(fileName: string, position: number, filesToSearch: string[]): DocumentHighlights[];
+        getOutliningSpans(file: string): OutliningSpan[];
+        getTodoComments(_fileName: string, _descriptors: TodoCommentDescriptor[]): TodoComment[];
+        getDocCommentTemplateAtPosition(_fileName: string, _position: number): TextInsertion;
+        isValidBraceCompletionAtPosition(_fileName: string, _position: number, _openingBrace: number): boolean;
+        getJsxClosingTagAtPosition(_fileName: string, _position: number): never;
+        getSpanOfEnclosingComment(_fileName: string, _position: number, _onlyMultiLine: boolean): TextSpan;
+        getCodeFixesAtPosition(file: string, start: number, end: number, errorCodes: ReadonlyArray<number>): ReadonlyArray<CodeFixAction>;
+        getCombinedCodeFix: typeof notImplemented;
+        applyCodeActionCommand: typeof notImplemented;
+        private createFileLocationOrRangeRequestArgs;
+        private createFileLocationRequestArgs;
+        private createFileRangeRequestArgs;
+        private createFileLocationRequestArgsWithEndLineAndOffset;
+        getApplicableRefactors(fileName: string, positionOrRange: number | TextRange): ApplicableRefactorInfo[];
+        getEditsForRefactor(fileName: string, _formatOptions: FormatCodeSettings, positionOrRange: number | TextRange, refactorName: string, actionName: string): RefactorEditInfo;
+        organizeImports(_scope: OrganizeImportsScope, _formatOptions: FormatCodeSettings): ReadonlyArray<FileTextChanges>;
+        getEditsForFileRename(): never;
+        private convertCodeEditsToTextChanges;
+        private convertChanges;
+        convertTextChangeToCodeEdit(change: protocol.CodeEdit, fileName: string): TextChange;
+        getBraceMatchingAtPosition(fileName: string, position: number): TextSpan[];
+        getIndentationAtPosition(_fileName: string, _position: number, _options: EditorOptions): number;
+        getSyntacticClassifications(_fileName: string, _span: TextSpan): ClassifiedSpan[];
+        getSemanticClassifications(_fileName: string, _span: TextSpan): ClassifiedSpan[];
+        getEncodedSyntacticClassifications(_fileName: string, _span: TextSpan): Classifications;
+        getEncodedSemanticClassifications(_fileName: string, _span: TextSpan): Classifications;
+        getProgram(): Program;
+        getNonBoundSourceFile(_fileName: string): SourceFile;
+        getSourceFile(_fileName: string): SourceFile;
+        cleanupSemanticCache(): void;
+        dispose(): void;
+    }
+}
+declare type TestRunnerKind = CompilerTestKind | FourslashTestKind | "project" | "rwc" | "test262" | "user" | "dt";
+declare type CompilerTestKind = "conformance" | "compiler";
+declare type FourslashTestKind = "fourslash" | "fourslash-shims" | "fourslash-shims-pp" | "fourslash-server";
+declare abstract class RunnerBase {
+    tests: (string | Harness.FileBasedTest)[];
+    /** Add a source file to the runner's list of tests that need to be initialized with initializeTests */
+    addTest(fileName: string): void;
+    enumerateFiles(folder: string, regex?: RegExp, options?: {
+        recursive: boolean;
+    }): string[];
+    abstract kind(): TestRunnerKind;
+    abstract enumerateTestFiles(): (string | Harness.FileBasedTest)[];
+    /** The working directory where tests are found. Needed for batch testing where the input path will differ from the output path inside baselines */
+    workingDirectory: string;
+    /** Setup the runner's tests so that they are ready to be executed by the harness
+     *  The first test should be a describe/it block that sets up the harness's compiler instance appropriately
+     */
+    abstract initializeTests(): void;
+    /** Replaces instances of full paths with fileNames only */
+    static removeFullPaths(path: string): string;
+}
+declare namespace Harness.SourceMapRecorder {
+    function getSourceMapRecord(sourceMapDataList: ReadonlyArray<ts.SourceMapData>, program: ts.Program, jsFiles: ReadonlyArray<documents.TextDocument>, declarationFiles: ReadonlyArray<documents.TextDocument>): string;
+}
+declare var _chai: typeof chai;
+declare var assert: typeof _chai.assert;
+declare var global: NodeJS.Global;
+declare var window: {};
+declare var XMLHttpRequest: {
+    new (): XMLHttpRequest;
+};
+interface XMLHttpRequest {
+    readonly readyState: number;
+    readonly responseText: string;
+    readonly status: number;
+    readonly statusText: string;
+    open(method: string, url: string, async?: boolean, user?: string, password?: string): void;
+    send(data?: string): void;
+    setRequestHeader(header: string, value: string): void;
+    getAllResponseHeaders(): string;
+    getResponseHeader(header: string): string | null;
+    overrideMimeType(mime: string): void;
+}
+declare namespace Utils {
+    const enum ExecutionEnvironment {
+        Node = 0,
+        Browser = 1
+    }
+    function getExecutionEnvironment(): ExecutionEnvironment;
+    let currentExecutionEnvironment: ExecutionEnvironment;
+    function encodeString(s: string): string;
+    function byteLength(s: string, encoding?: string): number;
+    function evalFile(fileContents: string, fileName: string, nodeContext?: any): void;
+    /** Splits the given string on \r\n, or on only \n if that fails, or on only \r if *that* fails. */
+    function splitContentByNewlines(content: string): string[];
+    /** Reads a file under /tests */
+    function readTestFile(path: string): string | undefined;
+    function memoize<T extends ts.AnyFunction>(f: T, memoKey: (...anything: any[]) => string): T;
+    const canonicalizeForHarness: ts.GetCanonicalFileName;
+    function assertInvariants(node: ts.Node | undefined, parent: ts.Node | undefined): void;
+    function convertDiagnostics(diagnostics: ReadonlyArray<ts.Diagnostic>): {
+        start: number | undefined;
+        length: number | undefined;
+        messageText: string;
+        category: string;
+        code: number;
+    }[];
+    function sourceFileToJSON(file: ts.Node): string;
+    function assertDiagnosticsEquals(array1: ReadonlyArray<ts.Diagnostic>, array2: ReadonlyArray<ts.Diagnostic>): void;
+    function assertStructuralEquals(node1: ts.Node, node2: ts.Node): void;
+    function filterStack(error: Error, stackTraceLimit?: number): Error;
+}
+declare namespace Harness {
+    interface IO {
+        newLine(): string;
+        getCurrentDirectory(): string;
+        useCaseSensitiveFileNames(): boolean;
+        resolvePath(path: string): string | undefined;
+        getFileSize(path: string): number;
+        readFile(path: string): string | undefined;
+        writeFile(path: string, contents: string): void;
+        directoryName(path: string): string | undefined;
+        getDirectories(path: string): string[];
+        createDirectory(path: string): void;
+        fileExists(fileName: string): boolean;
+        directoryExists(path: string): boolean;
+        deleteFile(fileName: string): void;
+        enumerateTestFiles(runner: RunnerBase): (string | FileBasedTest)[];
+        listFiles(path: string, filter?: RegExp, options?: {
+            recursive?: boolean;
+        }): string[];
+        log(text: string): void;
+        args(): string[];
+        getExecutingFilePath(): string;
+        getWorkspaceRoot(): string;
+        exit(exitCode?: number): void;
+        readDirectory(path: string, extension?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
+        getAccessibleFileSystemEntries(dirname: string): ts.FileSystemEntries;
+        tryEnableSourceMapsForHost?(): void;
+        getEnvironmentVariable?(name: string): string;
+        getMemoryUsage?(): number | undefined;
+    }
+    let IO: IO;
+    const harnessNewLine = "\r\n";
+    const virtualFileSystemRoot = "/";
+    function mockHash(s: string): string;
+}
+declare namespace Harness {
+    const libFolder = "built/local/";
+    const tcServicesFile: string;
+    type SourceMapEmitterCallback = (emittedFile: string, emittedLine: number, emittedColumn: number, sourceFile: string, sourceLine: number, sourceColumn: number, sourceName: string) => void;
+    let userSpecifiedRoot: string;
+    let lightMode: boolean;
+    /** Functionality for compiling TypeScript code */
+    namespace Compiler {
+        /** Aggregate various writes into a single array of lines. Useful for passing to the
+         *  TypeScript compiler to fill with source code or errors.
+         */
+        class WriterAggregator {
+            lines: string[];
+            currentLine: string;
+            Write(str: string): void;
+            WriteLine(str: string): void;
+            Close(): void;
+            reset(): void;
+        }
+        function createSourceFileAndAssertInvariants(fileName: string, sourceText: string, languageVersion: ts.ScriptTarget): ts.SourceFile;
+        const defaultLibFileName = "lib.d.ts";
+        const es2015DefaultLibFileName = "lib.es2015.d.ts";
+        function getDefaultLibrarySourceFile(fileName?: string): ts.SourceFile | undefined;
+        function getDefaultLibFileName(options: ts.CompilerOptions): string;
+        const fourslashFileName = "fourslash.ts";
+        let fourslashSourceFile: ts.SourceFile;
+        function getCanonicalFileName(fileName: string): string;
+        interface HarnessOptions {
+            useCaseSensitiveFileNames?: boolean;
+            includeBuiltFile?: string;
+            baselineFile?: string;
+            libFiles?: string;
+        }
+        function setCompilerOptionsFromHarnessSetting(settings: TestCaseParser.CompilerSettings, options: ts.CompilerOptions & HarnessOptions): void;
+        interface TestFile {
+            unitName: string;
+            content: string;
+            fileOptions?: any;
+        }
+        function compileFiles(inputFiles: TestFile[], otherFiles: TestFile[], harnessSettings: TestCaseParser.CompilerSettings | undefined, compilerOptions: ts.CompilerOptions | undefined, currentDirectory: string | undefined): compiler.CompilationResult;
+        interface DeclarationCompilationContext {
+            declInputFiles: TestFile[];
+            declOtherFiles: TestFile[];
+            harnessSettings: TestCaseParser.CompilerSettings & HarnessOptions | undefined;
+            options: ts.CompilerOptions;
+            currentDirectory: string;
+        }
+        function prepareDeclarationCompilationContext(inputFiles: ReadonlyArray<TestFile>, otherFiles: ReadonlyArray<TestFile>, result: compiler.CompilationResult, harnessSettings: TestCaseParser.CompilerSettings & HarnessOptions, options: ts.CompilerOptions, currentDirectory: string | undefined): DeclarationCompilationContext | undefined;
+        function compileDeclarationFiles(context: DeclarationCompilationContext | undefined): {
+            declInputFiles: TestFile[];
+            declOtherFiles: TestFile[];
+            declResult: compiler.CompilationResult;
+        } | undefined;
+        function minimalDiagnosticsToString(diagnostics: ReadonlyArray<ts.Diagnostic>, pretty?: boolean): string;
+        function getErrorBaseline(inputFiles: ReadonlyArray<TestFile>, diagnostics: ReadonlyArray<ts.Diagnostic>, pretty?: boolean): string;
+        const diagnosticSummaryMarker = "__diagnosticSummary";
+        const globalErrorsMarker = "__globalErrors";
+        function iterateErrorBaseline(inputFiles: ReadonlyArray<TestFile>, diagnostics: ReadonlyArray<ts.Diagnostic>, options?: {
+            pretty?: boolean;
+            caseSensitive?: boolean;
+            currentDirectory?: string;
+        }): IterableIterator<[string, string, number]>;
+        function doErrorBaseline(baselinePath: string, inputFiles: ReadonlyArray<TestFile>, errors: ReadonlyArray<ts.Diagnostic>, pretty?: boolean): void;
+        function doTypeAndSymbolBaseline(baselinePath: string, program: ts.Program, allFiles: {
+            unitName: string;
+            content: string;
+        }[], opts?: Baseline.BaselineOptions, multifile?: boolean, skipTypeBaselines?: boolean, skipSymbolBaselines?: boolean): void;
+        function doSourcemapBaseline(baselinePath: string, options: ts.CompilerOptions, result: compiler.CompilationResult, harnessSettings: TestCaseParser.CompilerSettings): void;
+        function doJsEmitBaseline(baselinePath: string, header: string, options: ts.CompilerOptions, result: compiler.CompilationResult, tsConfigFiles: ReadonlyArray<TestFile>, toBeCompiled: ReadonlyArray<TestFile>, otherFiles: ReadonlyArray<TestFile>, harnessSettings: TestCaseParser.CompilerSettings): void;
+        function collateOutputs(outputFiles: ReadonlyArray<documents.TextDocument>): string;
+        function iterateOutputs(outputFiles: Iterable<documents.TextDocument>): IterableIterator<[string, string]>;
+        function sanitizeTestFilePath(name: string): string;
+    }
+    interface FileBasedTest {
+        file: string;
+        configurations?: FileBasedTestConfiguration[];
+    }
+    interface FileBasedTestConfiguration {
+        [key: string]: string;
+    }
+    /**
+     * Compute FileBasedTestConfiguration variations based on a supplied list of variable settings.
+     */
+    function getFileBasedTestConfigurations(settings: TestCaseParser.CompilerSettings, varyBy: string[]): FileBasedTestConfiguration[] | undefined;
+    /**
+     * Compute a description for this configuration based on its entries
+     */
+    function getFileBasedTestConfigurationDescription(configuration: FileBasedTestConfiguration): string;
+    namespace TestCaseParser {
+        /** all the necessary information to set the right compiler settings */
+        interface CompilerSettings {
+            [name: string]: string;
+        }
+        /** All the necessary information to turn a multi file test into useful units for later compilation */
+        interface TestUnitData {
+            content: string;
+            name: string;
+            fileOptions: any;
+            originalFilePath: string;
+            references: string[];
+        }
+        function extractCompilerSettings(content: string): CompilerSettings;
+        interface TestCaseContent {
+            settings: CompilerSettings;
+            testUnitData: TestUnitData[];
+            tsConfig: ts.ParsedCommandLine | undefined;
+            tsConfigFileUnitData: TestUnitData | undefined;
+        }
+        /** Given a test file containing // @FileName directives, return an array of named units of code to be added to an existing compiler instance */
+        function makeUnitsFromTest(code: string, fileName: string, rootDir?: string, settings?: CompilerSettings): TestCaseContent;
+    }
+    /** Support class for baseline files */
+    namespace Baseline {
+        interface BaselineOptions {
+            Subfolder?: string;
+            Baselinefolder?: string;
+        }
+        function localPath(fileName: string, baselineFolder?: string, subfolder?: string): string;
+        function runBaseline(relativeFileName: string, generateContent: () => string | null, opts?: BaselineOptions): void;
+        function runMultifileBaseline(relativeFileBase: string, extension: string, generateContent: () => IterableIterator<[string, string, number]> | IterableIterator<[string, string]> | null, opts?: BaselineOptions, referencedExtensions?: string[]): void;
+    }
+    function isDefaultLibraryFile(filePath: string): boolean;
+    function isBuiltFile(filePath: string): boolean;
+    function getDefaultLibraryFile(filePath: string, io: IO): Compiler.TestFile;
+    function getConfigNameFromFileName(filename: string): "tsconfig.json" | "jsconfig.json" | undefined;
+}
+declare namespace Harness.LanguageService {
+    class ScriptInfo {
+        fileName: string;
+        content: string;
+        isRootFile: boolean;
+        version: number;
+        editRanges: {
+            length: number;
+            textChangeRange: ts.TextChangeRange;
+        }[];
+        private lineMap;
+        constructor(fileName: string, content: string, isRootFile: boolean);
+        private setContent;
+        getLineMap(): number[];
+        updateContent(content: string): void;
+        editContent(start: number, end: number, newText: string): void;
+        getTextChangeRangeBetweenVersions(startVersion: number, endVersion: number): ts.TextChangeRange;
+    }
+    class DefaultHostCancellationToken implements ts.HostCancellationToken {
+        static readonly instance: DefaultHostCancellationToken;
+        isCancellationRequested(): boolean;
+    }
+    interface LanguageServiceAdapter {
+        getHost(): LanguageServiceAdapterHost;
+        getLanguageService(): ts.LanguageService;
+        getClassifier(): ts.Classifier;
+        getPreProcessedFileInfo(fileName: string, fileContents: string): ts.PreProcessedFileInfo;
+    }
+    abstract class LanguageServiceAdapterHost {
+        protected cancellationToken: DefaultHostCancellationToken;
+        protected settings: ts.CompilerOptions;
+        readonly sys: fakes.System;
+        typesRegistry: ts.Map<void> | undefined;
+        private scriptInfos;
+        constructor(cancellationToken?: DefaultHostCancellationToken, settings?: ts.CompilerOptions);
+        readonly vfs: vfs.FileSystem;
+        getNewLine(): string;
+        getFilenames(): string[];
+        getScriptInfo(fileName: string): ScriptInfo | undefined;
+        addScript(fileName: string, content: string, isRootFile: boolean): void;
+        editScript(fileName: string, start: number, end: number, newText: string): void;
+        openFile(_fileName: string, _content?: string, _scriptKindName?: string): void;
+        /**
+         * @param line 0 based index
+         * @param col 0 based index
+         */
+        positionToLineAndCharacter(fileName: string, position: number): ts.LineAndCharacter;
+    }
+    class NativeLanguageServiceHost extends LanguageServiceAdapterHost implements ts.LanguageServiceHost, LanguageServiceAdapterHost {
+        isKnownTypesPackageName(name: string): boolean;
+        installPackage: typeof ts.notImplemented;
+        getCompilationSettings(): ts.CompilerOptions;
+        getCancellationToken(): DefaultHostCancellationToken;
+        getDirectories(path: string): string[];
+        getCurrentDirectory(): string;
+        getDefaultLibFileName(): string;
+        getScriptFileNames(): string[];
+        getScriptSnapshot(fileName: string): ts.IScriptSnapshot | undefined;
+        getScriptKind(): ts.ScriptKind;
+        getScriptVersion(fileName: string): string;
+        directoryExists(dirName: string): boolean;
+        fileExists(fileName: string): boolean;
+        readDirectory(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
+        readFile(path: string): string | undefined;
+        realpath(path: string): string;
+        getTypeRootsVersion(): number;
+        log: typeof ts.noop;
+        trace: typeof ts.noop;
+        error: typeof ts.noop;
+    }
+    class NativeLanguageServiceAdapter implements LanguageServiceAdapter {
+        private host;
+        constructor(cancellationToken?: ts.HostCancellationToken, options?: ts.CompilerOptions);
+        getHost(): LanguageServiceAdapterHost;
+        getLanguageService(): ts.LanguageService;
+        getClassifier(): ts.Classifier;
+        getPreProcessedFileInfo(fileName: string, fileContents: string): ts.PreProcessedFileInfo;
+    }
+    class ShimLanguageServiceHost extends LanguageServiceAdapterHost implements ts.LanguageServiceShimHost, ts.CoreServicesShimHost {
+        private nativeHost;
+        getModuleResolutionsForFile: (fileName: string) => string;
+        getTypeReferenceDirectiveResolutionsForFile: (fileName: string) => string;
+        constructor(preprocessToResolve: boolean, cancellationToken?: ts.HostCancellationToken, options?: ts.CompilerOptions);
+        getFilenames(): string[];
+        getScriptInfo(fileName: string): ScriptInfo | undefined;
+        addScript(fileName: string, content: string, isRootFile: boolean): void;
+        editScript(fileName: string, start: number, end: number, newText: string): void;
+        positionToLineAndCharacter(fileName: string, position: number): ts.LineAndCharacter;
+        getCompilationSettings(): string;
+        getCancellationToken(): ts.HostCancellationToken;
+        getCurrentDirectory(): string;
+        getDirectories(path: string): string;
+        getDefaultLibFileName(): string;
+        getScriptFileNames(): string;
+        getScriptSnapshot(fileName: string): ts.ScriptSnapshotShim;
+        getScriptKind(): ts.ScriptKind;
+        getScriptVersion(fileName: string): string;
+        getLocalizedDiagnosticMessages(): string;
+        readDirectory: typeof ts.notImplemented;
+        readDirectoryNames: typeof ts.notImplemented;
+        readFileNames: typeof ts.notImplemented;
+        fileExists(fileName: string): boolean;
+        readFile(fileName: string): string | undefined;
+        log(s: string): void;
+        trace(s: string): void;
+        error(s: string): void;
+        directoryExists(): boolean;
+    }
+    class ShimLanguageServiceAdapter implements LanguageServiceAdapter {
+        private host;
+        private factory;
+        constructor(preprocessToResolve: boolean, cancellationToken?: ts.HostCancellationToken, options?: ts.CompilerOptions);
+        getHost(): ShimLanguageServiceHost;
+        getLanguageService(): ts.LanguageService;
+        getClassifier(): ts.Classifier;
+        getPreProcessedFileInfo(fileName: string, fileContents: string): ts.PreProcessedFileInfo;
+    }
+    class SessionClientHost extends NativeLanguageServiceHost implements ts.server.SessionClientHost {
+        private client;
+        constructor(cancellationToken: ts.HostCancellationToken | undefined, settings: ts.CompilerOptions | undefined);
+        onMessage: typeof ts.noop;
+        writeMessage: typeof ts.noop;
+        setClient(client: ts.server.SessionClient): void;
+        openFile(fileName: string, content?: string, scriptKindName?: "TS" | "JS" | "TSX" | "JSX"): void;
+        editScript(fileName: string, start: number, end: number, newText: string): void;
+    }
+    class ServerLanguageServiceAdapter implements LanguageServiceAdapter {
+        private host;
+        private client;
+        constructor(cancellationToken?: ts.HostCancellationToken, options?: ts.CompilerOptions);
+        getHost(): SessionClientHost;
+        getLanguageService(): ts.LanguageService;
+        getClassifier(): ts.Classifier;
+        getPreProcessedFileInfo(): ts.PreProcessedFileInfo;
+    }
+}
+declare namespace ts.TestFSWithWatch {
+    const libFile: File;
+    const safeList: {
+        path: Path;
+        content: string;
+    };
+    interface TestServerHostCreationParameters {
+        useCaseSensitiveFileNames?: boolean;
+        executingFilePath?: string;
+        currentDirectory?: string;
+        newLine?: string;
+        useWindowsStylePaths?: boolean;
+        environmentVariables?: Map<string>;
+    }
+    function createWatchedSystem(fileOrFolderList: ReadonlyArray<FileOrFolderOrSymLink>, params?: TestServerHostCreationParameters): TestServerHost;
+    function createServerHost(fileOrFolderList: ReadonlyArray<FileOrFolderOrSymLink>, params?: TestServerHostCreationParameters): TestServerHost;
+    interface File {
+        path: string;
+        content: string;
+        fileSize?: number;
+    }
+    interface Folder {
+        path: string;
+    }
+    interface SymLink {
+        path: string;
+        symLink: string;
+    }
+    type FileOrFolderOrSymLink = File | Folder | SymLink;
+    function verifyMapSize(caption: string, map: Map<any>, expectedKeys: ReadonlyArray<string>): void;
+    function checkMultiMapKeyCount(caption: string, actual: MultiMap<any>, expectedKeys: ReadonlyMap<number>): void;
+    function checkMultiMapKeyCount(caption: string, actual: MultiMap<any>, expectedKeys: ReadonlyArray<string>, eachKeyCount: number): void;
+    function checkArray(caption: string, actual: ReadonlyArray<string>, expected: ReadonlyArray<string>): void;
+    function checkWatchedFiles(host: TestServerHost, expectedFiles: string[]): void;
+    function checkWatchedFilesDetailed(host: TestServerHost, expectedFiles: ReadonlyMap<number>): void;
+    function checkWatchedFilesDetailed(host: TestServerHost, expectedFiles: ReadonlyArray<string>, eachFileWatchCount: number): void;
+    function checkWatchedDirectories(host: TestServerHost, expectedDirectories: string[], recursive: boolean): void;
+    function checkWatchedDirectoriesDetailed(host: TestServerHost, expectedDirectories: ReadonlyMap<number>, recursive: boolean): void;
+    function checkWatchedDirectoriesDetailed(host: TestServerHost, expectedDirectories: ReadonlyArray<string>, eachDirectoryWatchCount: number, recursive: boolean): void;
+    function checkOutputContains(host: TestServerHost, expected: ReadonlyArray<string>): void;
+    function checkOutputDoesNotContain(host: TestServerHost, expectedToBeAbsent: string[] | ReadonlyArray<string>): void;
+    type TimeOutCallback = () => any;
+    interface TestFileWatcher {
+        cb: FileWatcherCallback;
+        fileName: string;
+    }
+    interface TestDirectoryWatcher {
+        cb: DirectoryWatcherCallback;
+        directoryName: string;
+    }
+    interface ReloadWatchInvokeOptions {
+        /** Invokes the directory watcher for the parent instead of the file changed */
+        invokeDirectoryWatcherInsteadOfFileChanged: boolean;
+        /** When new file is created, do not invoke watches for it */
+        ignoreWatchInvokedWithTriggerAsFileCreate: boolean;
+        /** Invoke the file delete, followed by create instead of file changed */
+        invokeFileDeleteCreateAsPartInsteadOfChange: boolean;
+    }
+    enum Tsc_WatchDirectory {
+        WatchFile = "RecursiveDirectoryUsingFsWatchFile",
+        NonRecursiveWatchDirectory = "RecursiveDirectoryUsingNonRecursiveWatchDirectory",
+        DynamicPolling = "RecursiveDirectoryUsingDynamicPriorityPolling"
+    }
+    class TestServerHost implements server.ServerHost, FormatDiagnosticsHost, ModuleResolutionHost {
+        withSafeList: boolean;
+        useCaseSensitiveFileNames: boolean;
+        readonly newLine: string;
+        readonly useWindowsStylePath?: boolean | undefined;
+        private readonly environmentVariables?;
+        args: string[];
+        private readonly output;
+        private fs;
+        private time;
+        getCanonicalFileName: (s: string) => string;
+        private toPath;
+        private timeoutCallbacks;
+        private immediateCallbacks;
+        readonly screenClears: number[];
+        readonly watchedDirectories: MultiMap<TestDirectoryWatcher>;
+        readonly watchedDirectoriesRecursive: MultiMap<TestDirectoryWatcher>;
+        readonly watchedFiles: MultiMap<TestFileWatcher>;
+        private readonly executingFilePath;
+        private readonly currentDirectory;
+        private readonly dynamicPriorityWatchFile;
+        private readonly customRecursiveWatchDirectory;
+        constructor(withSafeList: boolean, useCaseSensitiveFileNames: boolean, executingFilePath: string, currentDirectory: string, fileOrFolderorSymLinkList: ReadonlyArray<FileOrFolderOrSymLink>, newLine?: string, useWindowsStylePath?: boolean | undefined, environmentVariables?: Map<string> | undefined);
+        getNewLine(): string;
+        toNormalizedAbsolutePath(s: string): string;
+        toFullPath(s: string): Path;
+        getHostSpecificPath(s: string): string;
+        private now;
+        reloadFS(fileOrFolderOrSymLinkList: ReadonlyArray<FileOrFolderOrSymLink>, options?: Partial<ReloadWatchInvokeOptions>): void;
+        modifyFile(filePath: string, content: string, options?: Partial<ReloadWatchInvokeOptions>): void;
+        renameFolder(folderName: string, newFolderName: string): void;
+        private renameFolderEntries;
+        ensureFileOrFolder(fileOrDirectoryOrSymLink: FileOrFolderOrSymLink, ignoreWatchInvokedWithTriggerAsFileCreate?: boolean): void;
+        private ensureFolder;
+        private addFileOrFolderInFolder;
+        private removeFileOrFolder;
+        removeFolder(folderPath: string, recursive?: boolean): void;
+        invokeWatchedDirectoriesCallback(folderFullPath: string, relativePath: string): void;
+        invokeWatchedDirectoriesRecursiveCallback(folderFullPath: string, relativePath: string): void;
+        invokeFileWatcher(fileFullPath: string, eventKind: FileWatcherEventKind, useFileNameInCallback?: boolean): void;
+        private getRelativePathToDirectory;
+        /**
+         * This will call the directory watcher for the folderFullPath and recursive directory watchers for this and base folders
+         */
+        private invokeDirectoryWatcher;
+        private directoryCallback;
+        /**
+         * This will call the recursive directory watcher for this directory as well as all the base directories
+         */
+        private invokeRecursiveDirectoryWatcher;
+        private toFsEntry;
+        private toFsFile;
+        private toFsSymLink;
+        private toFsFolder;
+        private getRealFsEntry;
+        private isFsFile;
+        private getRealFile;
+        private isFsFolder;
+        private getRealFolder;
+        fileExists(s: string): boolean;
+        getModifiedTime(s: string): Date;
+        readFile(s: string): string | undefined;
+        getFileSize(s: string): number;
+        directoryExists(s: string): boolean;
+        getDirectories(s: string): string[];
+        readDirectory(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
+        watchDirectory(directoryName: string, cb: DirectoryWatcherCallback, recursive: boolean): FileWatcher;
+        createHash(s: string): string;
+        createSHA256Hash(s: string): string;
+        watchFile(fileName: string, cb: FileWatcherCallback, pollingInterval: number): FileWatcher;
+        setTimeout(callback: TimeOutCallback, _time: number, ...args: any[]): number;
+        getNextTimeoutId(): number;
+        clearTimeout(timeoutId: any): void;
+        clearScreen(): void;
+        checkTimeoutQueueLengthAndRun(expected: number): void;
+        checkTimeoutQueueLength(expected: number): void;
+        runQueuedTimeoutCallbacks(timeoutId?: number): void;
+        runQueuedImmediateCallbacks(checkCount?: number): void;
+        setImmediate(callback: TimeOutCallback, _time: number, ...args: any[]): number;
+        clearImmediate(timeoutId: any): void;
+        createDirectory(directoryName: string): void;
+        writeFile(path: string, content: string): void;
+        write(message: string): void;
+        getOutput(): ReadonlyArray<string>;
+        clearOutput(): void;
+        realpath(s: string): string;
+        readonly exitMessage: string;
+        exitCode: number | undefined;
+        readonly resolvePath: (s: string) => string;
+        readonly getExecutingFilePath: () => string;
+        readonly getCurrentDirectory: () => string;
+        exit(exitCode?: number): void;
+        getEnvironmentVariable(name: string): string;
+    }
+}
+declare namespace FourSlash {
+    import ArrayOrSingle = FourSlashInterface.ArrayOrSingle;
+    const enum FourSlashTestType {
+        Native = 0,
+        Shims = 1,
+        ShimsWithPreprocess = 2,
+        Server = 3
+    }
+    interface FourSlashFile {
+        content: string;
+        fileName: string;
+        symlinks?: string[];
+        version: number;
+        fileOptions: Harness.TestCaseParser.CompilerSettings;
+    }
+    interface FourSlashData {
+        globalOptions: Harness.TestCaseParser.CompilerSettings;
+        files: FourSlashFile[];
+        markerPositions: ts.Map<Marker>;
+        markers: Marker[];
+        /**
+         * Inserted in source files by surrounding desired text
+         * in a range with `[|` and `|]`. For example,
+         *
+         * [|text in range|]
+         *
+         * is a range with `text in range` "selected".
+         */
+        ranges: Range[];
+    }
+    interface Marker {
+        fileName: string;
+        position: number;
+        data?: {};
+    }
+    interface Range {
+        fileName: string;
+        pos: number;
+        end: number;
+        marker?: Marker;
+    }
+    interface TextSpan {
+        start: number;
+        end: number;
+    }
+    class TestCancellationToken implements ts.HostCancellationToken {
+        private static readonly notCanceled;
+        private numberOfCallsBeforeCancellation;
+        isCancellationRequested(): boolean;
+        setCancelled(numberOfCalls?: number): void;
+        resetCancelled(): void;
+    }
+    function verifyOperationIsCancelled(f: () => void): void;
+    class TestState {
+        private basePath;
+        private testType;
+        testData: FourSlashData;
+        private languageServiceAdapterHost;
+        private languageService;
+        private cancellationToken;
+        currentCaretPosition: number;
+        selectionEnd: number;
+        lastKnownMarker: string;
+        activeFile: FourSlashFile;
+        enableFormatting: boolean;
+        formatCodeSettings: ts.FormatCodeSettings;
+        private inputFiles;
+        private static getDisplayPartsJson;
+        private addMatchedInputFile;
+        private getLanguageServiceAdapter;
+        constructor(basePath: string, testType: FourSlashTestType, testData: FourSlashData);
+        private getFileContent;
+        goToMarker(name?: string | Marker): void;
+        goToEachMarker(markers: ReadonlyArray<Marker>, action: (marker: Marker, index: number) => void): void;
+        goToEachRange(action: () => void): void;
+        markerName(m: Marker): string;
+        goToPosition(pos: number): void;
+        select(startMarker: string, endMarker: string): void;
+        selectRange(range: Range): void;
+        moveCaretRight(count?: number): void;
+        openFile(indexOrName: number | string, content?: string, scriptKindName?: string): void;
+        verifyErrorExistsBetweenMarkers(startMarkerName: string, endMarkerName: string, shouldExist: boolean): void;
+        private raiseError;
+        private messageAtLastKnownMarker;
+        private assertionMessageAtLastKnownMarker;
+        private getDiagnostics;
+        private getAllDiagnostics;
+        verifyErrorExistsAfterMarker(markerName: string, shouldExist: boolean, after: boolean): void;
+        private anyErrorInRange;
+        private printErrorLog;
+        private formatRange;
+        private formatLineAndCharacterOfPosition;
+        private formatPosition;
+        verifyNoErrors(): void;
+        verifyNumberOfErrorsInCurrentFile(expected: number): void;
+        verifyEval(expr: string, value: any): void;
+        verifyGoToDefinitionIs(endMarker: ArrayOrSingle<string>): void;
+        verifyGoToDefinition(arg0: any, endMarkerNames?: ArrayOrSingle<string>): void;
+        private getGoToDefinition;
+        private getGoToDefinitionAndBoundSpan;
+        verifyGoToType(arg0: any, endMarkerNames?: ArrayOrSingle<string>): void;
+        private verifyGoToX;
+        private verifyGoToXPlain;
+        verifyGoToDefinitionForMarkers(markerNames: string[]): void;
+        private verifyGoToXSingle;
+        private verifyGoToXWorker;
+        private verifyDefinitionTextSpan;
+        verifyGetEmitOutputForCurrentFile(expected: string): void;
+        verifyGetEmitOutputContentsForCurrentFile(expected: ts.OutputFile[]): void;
+        verifyCompletionListCount(expectedCount: number, negative: boolean): void;
+        verifyCompletionListItemsCountIsGreaterThan(count: number, negative: boolean): void;
+        verifyCompletionListStartsWithItemsInOrder(items: string[]): void;
+        noItemsWithSameNameButDifferentKind(): void;
+        verifyCompletionListIsEmpty(negative: boolean): void;
+        verifyCompletionListAllowsNewIdentifier(negative: boolean): void;
+        verifyCompletionListIsGlobal(expected: boolean): void;
+        verifyCompletions(options: FourSlashInterface.VerifyCompletionsOptions): void;
+        private verifyCompletionsWorker;
+        private verifyCompletionEntry;
+        private verifyCompletionsAreExactly;
+        verifyCompletionsAt(markerName: string | ReadonlyArray<string>, expected: ReadonlyArray<FourSlashInterface.ExpectedCompletionEntry>, options?: FourSlashInterface.CompletionsAtOptions): void;
+        verifyCompletionListContains(entryId: ts.Completions.CompletionEntryIdentifier, text?: string, documentation?: string, kind?: string | {
+            kind?: string;
+            kindModifiers?: string;
+        }, spanIndex?: number, hasAction?: boolean, options?: FourSlashInterface.VerifyCompletionListContainsOptions): void;
+        /**
+         * Verify that the completion list does NOT contain the given symbol.
+         * The symbol is considered matched with the symbol in the list if and only if all given parameters must matched.
+         * When any parameter is omitted, the parameter is ignored during comparison and assumed that the parameter with
+         * that property of the symbol in the list.
+         * @param symbol the name of symbol
+         * @param expectedText the text associated with the symbol
+         * @param expectedDocumentation the documentation text associated with the symbol
+         * @param expectedKind the kind of symbol (see ScriptElementKind)
+         * @param spanIndex the index of the range that the completion item's replacement text span should match
+         */
+        verifyCompletionListDoesNotContain(entryId: ts.Completions.CompletionEntryIdentifier, expectedText?: string, expectedDocumentation?: string, expectedKind?: string | {
+            kind?: string;
+            kindModifiers?: string;
+        }, spanIndex?: number, options?: FourSlashInterface.CompletionsAtOptions): void;
+        verifyCompletionEntryDetails(entryName: string, expectedText: string, expectedDocumentation?: string, kind?: string, tags?: ts.JSDocTagInfo[]): void;
+        /** Use `getProgram` instead of accessing this directly. */
+        private _program;
+        /** Use `getChecker` instead of accessing this directly. */
+        private _checker;
+        private getProgram;
+        private getChecker;
+        private getSourceFile;
+        private getNode;
+        private goToAndGetNode;
+        private verifyRange;
+        private verifySymbol;
+        verifySymbolAtLocation(startRange: Range, declarationRanges: Range[]): void;
+        symbolsInScope(range: Range): ts.Symbol[];
+        setTypesRegistry(map: ts.MapLike<void>): void;
+        verifyTypeOfSymbolAtLocation(range: Range, symbol: ts.Symbol, expected: string): void;
+        private verifyDocumentHighlightsRespectFilesList;
+        verifyReferenceGroups(starts: ArrayOrSingle<string> | ArrayOrSingle<Range>, parts: ReadonlyArray<FourSlashInterface.ReferenceGroup>): void;
+        verifyNoReferences(markerNameOrRange?: string | Range): void;
+        verifyGetReferencesForServerTest(expected: ReadonlyArray<ts.ReferenceEntry>): void;
+        verifySingleReferenceGroup(definition: FourSlashInterface.ReferenceGroupDefinition, ranges?: Range[]): void;
+        private assertObjectsEqual;
+        verifyDisplayPartsOfReferencedSymbol(expected: ts.SymbolDisplayPart[]): void;
+        private getCompletionListAtCaret;
+        private getCompletionEntryDetails;
+        private getReferencesAtCaret;
+        private findReferencesAtCaret;
+        getSyntacticDiagnostics(expected: ReadonlyArray<FourSlashInterface.Diagnostic>): void;
+        getSemanticDiagnostics(expected: ReadonlyArray<FourSlashInterface.Diagnostic>): void;
+        getSuggestionDiagnostics(expected: ReadonlyArray<FourSlashInterface.Diagnostic>): void;
+        private testDiagnostics;
+        verifyQuickInfoAt(markerName: string, expectedText: string, expectedDocumentation?: string): void;
+        verifyQuickInfos(namesAndTexts: {
+            [name: string]: string | [string, string];
+        }): void;
+        verifyQuickInfoString(expectedText: string, expectedDocumentation?: string): void;
+        verifyQuickInfoDisplayParts(kind: string, kindModifiers: string, textSpan: TextSpan, displayParts: ts.SymbolDisplayPart[], documentation: ts.SymbolDisplayPart[], tags: ts.JSDocTagInfo[]): void;
+        verifyRangesAreRenameLocations(options?: Range[] | {
+            findInStrings?: boolean;
+            findInComments?: boolean;
+            ranges?: Range[];
+        }): void;
+        verifyRenameLocations(startRanges: ArrayOrSingle<Range>, options: Range[] | {
+            findInStrings?: boolean;
+            findInComments?: boolean;
+            ranges: Range[];
+        }): void;
+        verifyQuickInfoExists(negative: boolean): void;
+        verifyNoSignatureHelp(markers: ReadonlyArray<string>): void;
+        verifySignatureHelp(optionses: ReadonlyArray<FourSlashInterface.VerifySignatureHelpOptions>): void;
+        private verifySignatureHelpWorker;
+        private validate;
+        verifyRenameInfoSucceeded(displayName?: string, fullDisplayName?: string, kind?: string, kindModifiers?: string): void;
+        verifyRenameInfoFailed(message?: string): void;
+        private alignmentForExtraInfo;
+        private spanInfoToString;
+        private baselineCurrentFileLocations;
+        getBreakpointStatementLocation(pos: number): ts.TextSpan | undefined;
+        baselineCurrentFileBreakpointLocations(): void;
+        baselineGetEmitOutput(insertResultsIntoVfs?: boolean): void;
+        baselineQuickInfo(): void;
+        printBreakpointLocation(pos: number): void;
+        printBreakpointAtCurrentLocation(): void;
+        printCurrentParameterHelp(): void;
+        printCurrentQuickInfo(): void;
+        printErrorList(): void;
+        printCurrentFileState(showWhitespace: boolean, makeCaretVisible: boolean): void;
+        printCurrentSignatureHelp(): void;
+        private getSignatureHelp;
+        printCompletionListMembers(preferences: ts.UserPreferences | undefined): void;
+        private printMembersOrCompletions;
+        printContext(): void;
+        deleteChar(count?: number): void;
+        replace(start: number, length: number, text: string): void;
+        deleteCharBehindMarker(count?: number): void;
+        type(text: string, highFidelity?: boolean): void;
+        paste(text: string): void;
+        private checkPostEditInvariants;
+        /**
+         * @returns The number of characters added to the file as a result of the edits.
+         * May be negative.
+         */
+        private applyEdits;
+        copyFormatOptions(): ts.FormatCodeSettings;
+        setFormatOptions(formatCodeOptions: ts.FormatCodeOptions | ts.FormatCodeSettings): ts.FormatCodeSettings;
+        formatDocument(): void;
+        formatSelection(start: number, end: number): void;
+        formatOnType(pos: number, key: string): void;
+        private editScriptAndUpdateMarkers;
+        private removeWhitespace;
+        goToBOF(): void;
+        goToEOF(): void;
+        goToRangeStart({ fileName, pos }: Range): void;
+        goToTypeDefinition(definitionIndex: number): void;
+        verifyTypeDefinitionsCount(negative: boolean, expectedCount: number): void;
+        verifyImplementationListIsEmpty(negative: boolean): void;
+        verifyGoToDefinitionName(expectedName: string, expectedContainerName: string): void;
+        goToImplementation(): void;
+        verifyRangesInImplementationList(markerName: string): void;
+        getMarkers(): Marker[];
+        getMarkerNames(): string[];
+        getRanges(): Range[];
+        rangesByText(): ts.Map<Range[]>;
+        private rangeText;
+        verifyCaretAtMarker(markerName?: string): void;
+        private getIndentation;
+        verifyIndentationAtCurrentPosition(numberOfSpaces: number, indentStyle?: ts.IndentStyle, baseIndentSize?: number): void;
+        verifyIndentationAtPosition(fileName: string, position: number, numberOfSpaces: number, indentStyle?: ts.IndentStyle, baseIndentSize?: number): void;
+        verifyCurrentLineContent(text: string): void;
+        verifyCurrentFileContent(text: string): void;
+        private verifyFileContent;
+        verifyTextAtCaretIs(text: string): void;
+        verifyCurrentNameOrDottedNameSpanText(text: string): undefined;
+        private getNameOrDottedNameSpan;
+        baselineCurrentFileNameOrDottedNameSpans(): void;
+        printNameOrDottedNameSpans(pos: number): void;
+        private verifyClassifications;
+        verifyProjectInfo(expected: string[]): void;
+        verifySemanticClassifications(expected: {
+            classificationType: string;
+            text: string;
+        }[]): void;
+        verifySyntacticClassifications(expected: {
+            classificationType: string;
+            text: string;
+        }[]): void;
+        printOutliningSpans(): void;
+        verifyOutliningSpans(spans: Range[], kind?: "comment" | "region" | "code" | "imports"): void;
+        verifyTodoComments(descriptors: string[], spans: Range[]): void;
+        /**
+         * Finds and applies a code action corresponding to the supplied parameters.
+         * If index is undefined, applies the unique code action available.
+         * @param errorCode The error code that generated the code action.
+         * @param index The nth (0-index-based) codeaction available generated by errorCode.
+         */
+        getAndApplyCodeActions(errorCode?: number, index?: number): void;
+        applyCodeActionFromCompletion(markerName: string, options: FourSlashInterface.VerifyCompletionActionOptions): void;
+        verifyRangeIs(expectedText: string, includeWhiteSpace?: boolean): void;
+        /**
+         * Compares expected text to the text that would be in the sole range
+         * (ie: [|...|]) in the file after applying the codefix sole codefix
+         * in the source file.
+         */
+        verifyRangeAfterCodeFix(expectedText: string, includeWhiteSpace?: boolean, errorCode?: number, index?: number): void;
+        verifyCodeFixAll({ fixId, fixAllDescription, newFileContent, commands: expectedCommands }: FourSlashInterface.VerifyCodeFixAllOptions): void;
+        /**
+         * Applies fixes for the errors in fileName and compares the results to
+         * expectedContents after all fixes have been applied.
+         *
+         * Note: applying one codefix may generate another (eg: remove duplicate implements
+         * may generate an extends -> interface conversion fix).
+         * @param expectedContents The contents of the file after the fixes are applied.
+         * @param fileName The file to check. If not supplied, the current open file is used.
+         */
+        verifyFileAfterCodeFix(expectedContents: string, fileName?: string): void;
+        verifyCodeFix(options: FourSlashInterface.VerifyCodeFixOptions): void;
+        private verifyNewContent;
+        /**
+         * Rerieves a codefix satisfying the parameters, or undefined if no such codefix is found.
+         * @param fileName Path to file where error should be retrieved from.
+         */
+        private getCodeFixes;
+        private applyCodeActions;
+        private applyChanges;
+        verifyImportFixAtPosition(expectedTextArray: string[], errorCode: number | undefined, preferences: ts.UserPreferences | undefined): void;
+        verifyDocCommentTemplate(expected: ts.TextInsertion | undefined): void;
+        verifyBraceCompletionAtPosition(negative: boolean, openingBrace: string): void;
+        verifyJsxClosingTag(map: {
+            [markerName: string]: ts.JsxClosingTagInfo | undefined;
+        }): void;
+        verifyMatchingBracePosition(bracePosition: number, expectedMatchPosition: number): void;
+        verifyNoMatchingBracePosition(bracePosition: number): void;
+        verifySpanOfEnclosingComment(negative: boolean, onlyMultiLineDiverges?: boolean): void;
+        verifyNavigationItemsCount(expected: number, searchValue: string, matchKind?: string, fileName?: string): void;
+        verifyNavigationItemsListContains(name: string, kind: string, searchValue: string, matchKind: string, fileName?: string, parentName?: string): void;
+        verifyNavigationBar(json: any, options: {
+            checkSpans?: boolean;
+        } | undefined): void;
+        verifyNavigationTree(json: any, options: {
+            checkSpans?: boolean;
+        } | undefined): void;
+        private verifyNavigationTreeOrBar;
+        printNavigationItems(searchValue: string): void;
+        printNavigationBar(): void;
+        private getOccurrencesAtCurrentPosition;
+        verifyOccurrencesAtPositionListContains(fileName: string, start: number, end: number, isWriteAccess?: boolean): undefined;
+        verifyOccurrencesAtPositionListCount(expectedCount: number): void;
+        private getDocumentHighlightsAtCurrentPosition;
+        verifyRangesAreOccurrences(isWriteAccess?: boolean): void;
+        verifyRangesWithSameTextAreRenameLocations(): void;
+        verifyRangesWithSameTextAreDocumentHighlights(): void;
+        verifyDocumentHighlightsOf(startRange: Range, ranges: Range[], options: FourSlashInterface.VerifyDocumentHighlightsOptions | undefined): void;
+        verifyRangesAreDocumentHighlights(ranges: Range[] | undefined, options: FourSlashInterface.VerifyDocumentHighlightsOptions | undefined): void;
+        verifyNoDocumentHighlights(startRange: Range): void;
+        private verifyDocumentHighlights;
+        verifyCodeFixAvailable(negative: boolean, expected: FourSlashInterface.VerifyCodeFixAvailableOptions[] | undefined): void;
+        verifyApplicableRefactorAvailableAtMarker(negative: boolean, markerName: string): void;
+        private getSelection;
+        verifyRefactorAvailable(negative: boolean, name: string, actionName?: string): void;
+        verifyRefactor({ name, actionName, refactors }: FourSlashInterface.VerifyRefactorOptions): void;
+        verifyApplicableRefactorAvailableForRange(negative: boolean): void;
+        applyRefactor({ refactorName, actionName, actionDescription, newContent: newContentWithRenameMarker }: FourSlashInterface.ApplyRefactorOptions): void;
+        noMoveToNewFile(): void;
+        moveToNewFile(options: FourSlashInterface.MoveToNewFileOptions): void;
+        private testNewFileContents;
+        verifyFileAfterApplyingRefactorAtMarker(markerName: string, expectedContent: string, refactorNameToApply: string, actionName: string, formattingOptions?: ts.FormatCodeSettings): void;
+        printAvailableCodeFixes(): void;
+        private getCurrentLineContent;
+        private assertItemInCompletionList;
+        private findFile;
+        private getLineColStringAtPosition;
+        private getTextSpanForRangeAtIndex;
+        getMarkerByName(markerName: string): Marker;
+        setCancelled(numberOfCalls: number): void;
+        resetCancelled(): void;
+        private static textSpansEqual;
+        getEditsForFileRename(options: FourSlashInterface.GetEditsForFileRenameOptions): void;
+        private getApplicableRefactors;
+    }
+    function runFourSlashTest(basePath: string, testType: FourSlashTestType, fileName: string): void;
+    function runFourSlashTestContent(basePath: string, testType: FourSlashTestType, content: string, fileName: string): void;
+}
+declare namespace FourSlashInterface {
+    class Test {
+        private state;
+        constructor(state: FourSlash.TestState);
+        markers(): FourSlash.Marker[];
+        markerNames(): string[];
+        marker(name: string): FourSlash.Marker;
+        markerName(m: FourSlash.Marker): string;
+        ranges(): FourSlash.Range[];
+        spans(): ts.TextSpan[];
+        rangesByText(): ts.Map<FourSlash.Range[]>;
+        markerByName(s: string): FourSlash.Marker;
+        symbolsInScope(range: FourSlash.Range): ts.Symbol[];
+        setTypesRegistry(map: ts.MapLike<void>): void;
+    }
+    class GoTo {
+        private state;
+        constructor(state: FourSlash.TestState);
+        marker(name?: string | FourSlash.Marker): void;
+        eachMarker(markers: ReadonlyArray<string>, action: (marker: FourSlash.Marker, index: number) => void): void;
+        eachMarker(action: (marker: FourSlash.Marker, index: number) => void): void;
+        rangeStart(range: FourSlash.Range): void;
+        eachRange(action: () => void): void;
+        bof(): void;
+        eof(): void;
+        implementation(): void;
+        position(position: number, fileNameOrIndex?: string | number): void;
+        file(indexOrName: number | string, content?: string, scriptKindName?: string): void;
+        select(startMarker: string, endMarker: string): void;
+        selectRange(range: FourSlash.Range): void;
+    }
+    class VerifyNegatable {
+        protected state: FourSlash.TestState;
+        private negative;
+        not: VerifyNegatable;
+        allowedClassElementKeywords: string[];
+        allowedConstructorParameterKeywords: string[];
+        constructor(state: FourSlash.TestState, negative?: boolean);
+        completionListCount(expectedCount: number): void;
+        completionListContains(entryId: string | ts.Completions.CompletionEntryIdentifier, text?: string, documentation?: string, kind?: string | {
+            kind?: string;
+            kindModifiers?: string;
+        }, spanIndex?: number, hasAction?: boolean, options?: VerifyCompletionListContainsOptions): void;
+        completionListItemsCountIsGreaterThan(count: number): void;
+        assertHasRanges(ranges: FourSlash.Range[]): void;
+        completionListIsEmpty(): void;
+        completionListContainsClassElementKeywords(): void;
+        completionListContainsConstructorParameterKeywords(): void;
+        completionListIsGlobal(expected: boolean): void;
+        completionListAllowsNewIdentifier(): void;
+        noSignatureHelp(...markers: string[]): void;
+        signatureHelp(...options: VerifySignatureHelpOptions[]): void;
+        errorExistsBetweenMarkers(startMarker: string, endMarker: string): void;
+        errorExistsAfterMarker(markerName?: string): void;
+        errorExistsBeforeMarker(markerName?: string): void;
+        quickInfoExists(): void;
+        typeDefinitionCountIs(expectedCount: number): void;
+        implementationListIsEmpty(): void;
+        isValidBraceCompletionAtPosition(openingBrace: string): void;
+        jsxClosingTag(map: {
+            [markerName: string]: ts.JsxClosingTagInfo | undefined;
+        }): void;
+        isInCommentAtPosition(onlyMultiLineDiverges?: boolean): void;
+        codeFix(options: VerifyCodeFixOptions): void;
+        codeFixAvailable(options?: VerifyCodeFixAvailableOptions[]): void;
+        applicableRefactorAvailableAtMarker(markerName: string): void;
+        applicableRefactorAvailableForRange(): void;
+        refactor(options: VerifyRefactorOptions): void;
+        refactorAvailable(name: string, actionName?: string): void;
+    }
+    class Verify extends VerifyNegatable {
+        constructor(state: FourSlash.TestState);
+        completionsAt(markerName: ArrayOrSingle<string>, completions: ReadonlyArray<ExpectedCompletionEntry>, options?: CompletionsAtOptions): void;
+        completions(...optionsArray: VerifyCompletionsOptions[]): void;
+        quickInfoIs(expectedText: string, expectedDocumentation?: string): void;
+        quickInfoAt(markerName: string, expectedText: string, expectedDocumentation?: string): void;
+        quickInfos(namesAndTexts: {
+            [name: string]: string;
+        }): void;
+        caretAtMarker(markerName?: string): void;
+        indentationIs(numberOfSpaces: number): void;
+        indentationAtPositionIs(fileName: string, position: number, numberOfSpaces: number, indentStyle?: ts.IndentStyle, baseIndentSize?: number): void;
+        textAtCaretIs(text: string): void;
+        /**
+         * Compiles the current file and evaluates 'expr' in a context containing
+         * the emitted output, then compares (using ===) the result of that expression
+         * to 'value'. Do not use this function with external modules as it is not supported.
+         */
+        eval(expr: string, value: any): void;
+        currentLineContentIs(text: string): void;
+        currentFileContentIs(text: string): void;
+        goToDefinitionIs(endMarkers: ArrayOrSingle<string>): void;
+        goToDefinition(startMarkerName: ArrayOrSingle<string>, endMarkerName: ArrayOrSingle<string>, range?: FourSlash.Range): void;
+        goToDefinition(startsAndEnds: [ArrayOrSingle<string>, ArrayOrSingle<string>][] | {
+            [startMarkerName: string]: ArrayOrSingle<string>;
+        }): void;
+        goToType(startMarkerName: ArrayOrSingle<string>, endMarkerName: ArrayOrSingle<string>): void;
+        goToType(startsAndEnds: [ArrayOrSingle<string>, ArrayOrSingle<string>][] | {
+            [startMarkerName: string]: ArrayOrSingle<string>;
+        }): void;
+        goToDefinitionForMarkers(...markerNames: string[]): void;
+        goToDefinitionName(name: string, containerName: string): void;
+        verifyGetEmitOutputForCurrentFile(expected: string): void;
+        verifyGetEmitOutputContentsForCurrentFile(expected: ts.OutputFile[]): void;
+        symbolAtLocation(startRange: FourSlash.Range, ...declarationRanges: FourSlash.Range[]): void;
+        typeOfSymbolAtLocation(range: FourSlash.Range, symbol: ts.Symbol, expected: string): void;
+        referenceGroups(starts: ArrayOrSingle<string> | ArrayOrSingle<FourSlash.Range>, parts: ReferenceGroup[]): void;
+        noReferences(markerNameOrRange?: string | FourSlash.Range): void;
+        getReferencesForServerTest(expected: ReadonlyArray<ts.ReferenceEntry>): void;
+        singleReferenceGroup(definition: ReferenceGroupDefinition, ranges?: FourSlash.Range[]): void;
+        findReferencesDefinitionDisplayPartsAtCaretAre(expected: ts.SymbolDisplayPart[]): void;
+        noErrors(): void;
+        numberOfErrorsInCurrentFile(expected: number): void;
+        baselineCurrentFileBreakpointLocations(): void;
+        baselineCurrentFileNameOrDottedNameSpans(): void;
+        baselineGetEmitOutput(insertResultsIntoVfs?: boolean): void;
+        baselineQuickInfo(): void;
+        nameOrDottedNameSpanTextIs(text: string): void;
+        outliningSpansInCurrentFile(spans: FourSlash.Range[], kind?: "comment" | "region" | "code" | "imports"): void;
+        todoCommentsInCurrentFile(descriptors: string[]): void;
+        matchingBracePositionInCurrentFile(bracePosition: number, expectedMatchPosition: number): void;
+        noMatchingBracePositionInCurrentFile(bracePosition: number): void;
+        docCommentTemplateAt(marker: string | FourSlash.Marker, expectedOffset: number, expectedText: string): void;
+        noDocCommentTemplateAt(marker: string | FourSlash.Marker): void;
+        rangeAfterCodeFix(expectedText: string, includeWhiteSpace?: boolean, errorCode?: number, index?: number): void;
+        codeFixAll(options: VerifyCodeFixAllOptions): void;
+        fileAfterApplyingRefactorAtMarker(markerName: string, expectedContent: string, refactorNameToApply: string, actionName: string, formattingOptions?: ts.FormatCodeSettings): void;
+        rangeIs(expectedText: string, includeWhiteSpace?: boolean): void;
+        getAndApplyCodeFix(errorCode?: number, index?: number): void;
+        applyCodeActionFromCompletion(markerName: string, options: VerifyCompletionActionOptions): void;
+        importFixAtPosition(expectedTextArray: string[], errorCode?: number, preferences?: ts.UserPreferences): void;
+        navigationBar(json: any, options?: {
+            checkSpans?: boolean;
+        }): void;
+        navigationTree(json: any, options?: {
+            checkSpans?: boolean;
+        }): void;
+        navigationItemsListCount(count: number, searchValue: string, matchKind?: string, fileName?: string): void;
+        navigationItemsListContains(name: string, kind: string, searchValue: string, matchKind: string, fileName?: string, parentName?: string): void;
+        occurrencesAtPositionContains(range: FourSlash.Range, isWriteAccess?: boolean): void;
+        occurrencesAtPositionCount(expectedCount: number): void;
+        rangesAreOccurrences(isWriteAccess?: boolean): void;
+        rangesWithSameTextAreRenameLocations(): void;
+        rangesAreRenameLocations(options?: FourSlash.Range[] | {
+            findInStrings?: boolean;
+            findInComments?: boolean;
+            ranges?: FourSlash.Range[];
+        }): void;
+        rangesAreDocumentHighlights(ranges?: FourSlash.Range[], options?: VerifyDocumentHighlightsOptions): void;
+        rangesWithSameTextAreDocumentHighlights(): void;
+        documentHighlightsOf(startRange: FourSlash.Range, ranges: FourSlash.Range[], options?: VerifyDocumentHighlightsOptions): void;
+        noDocumentHighlights(startRange: FourSlash.Range): void;
+        completionEntryDetailIs(entryName: string, text: string, documentation?: string, kind?: string, tags?: ts.JSDocTagInfo[]): void;
+        /**
+         * This method *requires* a contiguous, complete, and ordered stream of classifications for a file.
+         */
+        syntacticClassificationsAre(...classifications: {
+            classificationType: string;
+            text: string;
+        }[]): void;
+        /**
+         * This method *requires* an ordered stream of classifications for a file, and spans are highly recommended.
+         */
+        semanticClassificationsAre(...classifications: Classification[]): void;
+        renameInfoSucceeded(displayName?: string, fullDisplayName?: string, kind?: string, kindModifiers?: string): void;
+        renameInfoFailed(message?: string): void;
+        renameLocations(startRanges: ArrayOrSingle<FourSlash.Range>, options: FourSlash.Range[] | {
+            findInStrings?: boolean;
+            findInComments?: boolean;
+            ranges: FourSlash.Range[];
+        }): void;
+        verifyQuickInfoDisplayParts(kind: string, kindModifiers: string, textSpan: FourSlash.TextSpan, displayParts: ts.SymbolDisplayPart[], documentation: ts.SymbolDisplayPart[], tags: ts.JSDocTagInfo[]): void;
+        getSyntacticDiagnostics(expected: ReadonlyArray<Diagnostic>): void;
+        getSemanticDiagnostics(expected: ReadonlyArray<Diagnostic>): void;
+        getSuggestionDiagnostics(expected: ReadonlyArray<Diagnostic>): void;
+        ProjectInfo(expected: string[]): void;
+        allRangesAppearInImplementationList(markerName: string): void;
+        getEditsForFileRename(options: GetEditsForFileRenameOptions): void;
+        moveToNewFile(options: MoveToNewFileOptions): void;
+        noMoveToNewFile(): void;
+    }
+    class Edit {
+        private state;
+        constructor(state: FourSlash.TestState);
+        backspace(count?: number): void;
+        deleteAtCaret(times?: number): void;
+        replace(start: number, length: number, text: string): void;
+        paste(text: string): void;
+        insert(text: string): void;
+        insertLine(text: string): void;
+        insertLines(...lines: string[]): void;
+        moveRight(count?: number): void;
+        moveLeft(count?: number): void;
+        enableFormatting(): void;
+        disableFormatting(): void;
+        applyRefactor(options: ApplyRefactorOptions): void;
+    }
+    class Debug {
+        private state;
+        constructor(state: FourSlash.TestState);
+        printCurrentParameterHelp(): void;
+        printCurrentFileState(): void;
+        printCurrentFileStateWithWhitespace(): void;
+        printCurrentFileStateWithoutCaret(): void;
+        printCurrentQuickInfo(): void;
+        printCurrentSignatureHelp(): void;
+        printCompletionListMembers(options: ts.UserPreferences | undefined): void;
+        printAvailableCodeFixes(): void;
+        printBreakpointLocation(pos: number): void;
+        printBreakpointAtCurrentLocation(): void;
+        printNameOrDottedNameSpans(pos: number): void;
+        printErrorList(): void;
+        printNavigationItems(searchValue?: string): void;
+        printNavigationBar(): void;
+        printContext(): void;
+        printOutliningSpans(): void;
+    }
+    class Format {
+        private state;
+        constructor(state: FourSlash.TestState);
+        document(): void;
+        copyFormatOptions(): ts.FormatCodeSettings;
+        setFormatOptions(options: ts.FormatCodeOptions): ts.FormatCodeSettings;
+        selection(startMarker: string, endMarker: string): void;
+        onType(posMarker: string, key: string): void;
+        setOption(name: keyof ts.FormatCodeSettings, value: number | string | boolean): void;
+    }
+    class Cancellation {
+        private state;
+        constructor(state: FourSlash.TestState);
+        resetCancelled(): void;
+        setCancelled(numberOfCalls?: number): void;
+    }
+    interface Classification {
+        classificationType: ts.ClassificationTypeNames;
+        text: string;
+        textSpan?: FourSlash.TextSpan;
+    }
+    namespace Classification {
+        function comment(text: string, position?: number): Classification;
+        function identifier(text: string, position?: number): Classification;
+        function keyword(text: string, position?: number): Classification;
+        function numericLiteral(text: string, position?: number): Classification;
+        function operator(text: string, position?: number): Classification;
+        function stringLiteral(text: string, position?: number): Classification;
+        function whiteSpace(text: string, position?: number): Classification;
+        function text(text: string, position?: number): Classification;
+        function punctuation(text: string, position?: number): Classification;
+        function docCommentTagName(text: string, position?: number): Classification;
+        function className(text: string, position?: number): Classification;
+        function enumName(text: string, position?: number): Classification;
+        function interfaceName(text: string, position?: number): Classification;
+        function moduleName(text: string, position?: number): Classification;
+        function typeParameterName(text: string, position?: number): Classification;
+        function parameterName(text: string, position?: number): Classification;
+        function typeAliasName(text: string, position?: number): Classification;
+        function jsxOpenTagName(text: string, position?: number): Classification;
+        function jsxCloseTagName(text: string, position?: number): Classification;
+        function jsxSelfClosingTagName(text: string, position?: number): Classification;
+        function jsxAttribute(text: string, position?: number): Classification;
+        function jsxText(text: string, position?: number): Classification;
+        function jsxAttributeStringLiteralValue(text: string, position?: number): Classification;
+    }
+    interface ReferenceGroup {
+        definition: ReferenceGroupDefinition;
+        ranges: FourSlash.Range[];
+    }
+    type ReferenceGroupDefinition = string | {
+        text: string;
+        range: FourSlash.Range;
+    };
+    interface ApplyRefactorOptions {
+        refactorName: string;
+        actionName: string;
+        actionDescription: string;
+        newContent: string;
+    }
+    type ExpectedCompletionEntry = string | {
+        readonly name: string;
+        readonly insertText?: string;
+        readonly replacementSpan?: FourSlash.Range;
+        readonly hasAction?: boolean;
+        readonly isRecommended?: boolean;
+        readonly kind?: string;
+        readonly text: string;
+        readonly documentation: string;
+        readonly sourceDisplay?: string;
+    };
+    interface CompletionsAtOptions extends Partial<ts.UserPreferences> {
+        triggerCharacter?: ts.CompletionsTriggerCharacter;
+        isNewIdentifierLocation?: boolean;
+    }
+    interface VerifyCompletionsOptions {
+        readonly marker?: ArrayOrSingle<string>;
+        readonly isNewIdentifierLocation?: boolean;
+        readonly exact?: ArrayOrSingle<ExpectedCompletionEntry>;
+        readonly includes?: ArrayOrSingle<ExpectedCompletionEntry>;
+        readonly excludes?: ArrayOrSingle<string | {
+            readonly name: string;
+            readonly source: string;
+        }>;
+        readonly preferences?: ts.UserPreferences;
+        readonly triggerCharacter?: ts.CompletionsTriggerCharacter;
+    }
+    interface VerifySignatureHelpOptions {
+        readonly marker?: ArrayOrSingle<string>;
+        /** @default 1 */
+        readonly overloadsCount?: number;
+        /** @default undefined */
+        readonly docComment?: string;
+        readonly text?: string;
+        readonly parameterName?: string;
+        readonly parameterSpan?: string;
+        /** @default undefined */
+        readonly parameterDocComment?: string;
+        readonly parameterCount?: number;
+        readonly argumentCount?: number;
+        /** @default false */
+        readonly isVariadic?: boolean;
+        /** @default ts.emptyArray */
+        readonly tags?: ReadonlyArray<ts.JSDocTagInfo>;
+    }
+    type ArrayOrSingle<T> = T | ReadonlyArray<T>;
+    interface VerifyCompletionListContainsOptions extends ts.UserPreferences {
+        triggerCharacter?: ts.CompletionsTriggerCharacter;
+        sourceDisplay: string;
+        isRecommended?: true;
+        insertText?: string;
+        replacementSpan?: FourSlash.Range;
+    }
+    interface VerifyDocumentHighlightsOptions {
+        filesToSearch?: ReadonlyArray<string>;
+    }
+    interface NewContentOptions {
+        newFileContent?: string | {
+            readonly [filename: string]: string;
+        };
+        newRangeContent?: string;
+    }
+    interface VerifyCodeFixOptions extends NewContentOptions {
+        description: string;
+        errorCode?: number;
+        index?: number;
+        preferences?: ts.UserPreferences;
+    }
+    interface VerifyCodeFixAvailableOptions {
+        description: string;
+        commands?: ts.CodeActionCommand[];
+    }
+    interface VerifyCodeFixAllOptions {
+        fixId: string;
+        fixAllDescription: string;
+        newFileContent: string;
+        commands: ReadonlyArray<{}>;
+    }
+    interface VerifyRefactorOptions {
+        name: string;
+        actionName: string;
+        refactors: ts.ApplicableRefactorInfo[];
+    }
+    interface VerifyCompletionActionOptions extends NewContentOptions {
+        name: string;
+        source?: string;
+        description: string;
+        preferences?: ts.UserPreferences;
+    }
+    interface Diagnostic {
+        message: string;
+        range?: FourSlash.Range;
+        code: number;
+        reportsUnnecessary?: true;
+    }
+    interface GetEditsForFileRenameOptions {
+        readonly oldPath: string;
+        readonly newPath: string;
+        readonly newFileContents: {
+            readonly [fileName: string]: string;
+        };
+    }
+    interface MoveToNewFileOptions {
+        readonly newFileContents: {
+            readonly [fileName: string]: string;
+        };
+        readonly preferences?: ts.UserPreferences;
+    }
+}
+interface TypeWriterTypeResult {
+    line: number;
+    syntaxKind: number;
+    sourceText: string;
+    type: string;
+}
+interface TypeWriterSymbolResult {
+    line: number;
+    syntaxKind: number;
+    sourceText: string;
+    symbol: string;
+}
+interface TypeWriterResult {
+    line: number;
+    syntaxKind: number;
+    sourceText: string;
+    symbol?: string;
+    type?: string;
+}
+declare class TypeWriterWalker {
+    private program;
+    currentSourceFile: ts.SourceFile;
+    private checker;
+    constructor(program: ts.Program, fullTypeCheck: boolean);
+    getSymbols(fileName: string): IterableIterator<TypeWriterSymbolResult>;
+    getTypes(fileName: string): IterableIterator<TypeWriterTypeResult>;
+    private visitNode;
+    private writeTypeOrSymbol;
+}
+interface FileInformation {
+    contents?: string;
+    contentsPath?: string;
+    codepage: number;
+    bom?: string;
+}
+interface FindFileResult {
+}
+interface IoLogFile {
+    path: string;
+    codepage: number;
+    result?: FileInformation;
+}
+interface IoLog {
+    timestamp: string;
+    arguments: string[];
+    executingPath: string;
+    currentDirectory: string;
+    useCustomLibraryFile?: boolean;
+    filesRead: IoLogFile[];
+    filesWritten: {
+        path: string;
+        contents?: string;
+        contentsPath?: string;
+        bom: boolean;
+    }[];
+    filesDeleted: string[];
+    filesAppended: {
+        path: string;
+        contents?: string;
+        contentsPath?: string;
+    }[];
+    fileExists: {
+        path: string;
+        result?: boolean;
+    }[];
+    filesFound: {
+        path: string;
+        pattern: string;
+        result?: FindFileResult;
+    }[];
+    dirs: {
+        path: string;
+        re: string;
+        re_m: boolean;
+        re_g: boolean;
+        re_i: boolean;
+        opts: {
+            recursive?: boolean;
+        };
+        result?: string[];
+    }[];
+    dirExists: {
+        path: string;
+        result?: boolean;
+    }[];
+    dirsCreated: string[];
+    pathsResolved: {
+        path: string;
+        result?: string;
+    }[];
+    directoriesRead: {
+        path: string;
+        extensions: ReadonlyArray<string> | undefined;
+        exclude: ReadonlyArray<string> | undefined;
+        include: ReadonlyArray<string> | undefined;
+        depth: number | undefined;
+        result: ReadonlyArray<string>;
+    }[];
+    useCaseSensitiveFileNames?: boolean;
+}
+interface PlaybackControl {
+    startReplayFromFile(logFileName: string): void;
+    startReplayFromString(logContents: string): void;
+    startReplayFromData(log: IoLog): void;
+    endReplay(): void;
+    startRecord(logFileName: string): void;
+    endRecord(): void;
+}
+declare namespace Playback {
+    interface PlaybackIO extends Harness.IO, PlaybackControl {
+    }
+    interface PlaybackSystem extends ts.System, PlaybackControl {
+    }
+    function newStyleLogIntoOldStyleLog(log: IoLog, host: ts.System | Harness.IO, baseName: string): IoLog;
+    function oldStyleLogIntoNewStyleLog(log: IoLog, writeFile: typeof Harness.IO.writeFile, baseTestName: string): IoLog;
+    function wrapIO(underlying: Harness.IO): PlaybackIO;
+    function wrapSystem(underlying: ts.System): PlaybackSystem;
+}
diff --git a/src/built/local/harness.js b/src/built/local/harness.js
new file mode 100644
index 00000000000..d1db38a129e
--- /dev/null
+++ b/src/built/local/harness.js
@@ -0,0 +1,11641 @@
+"use strict";
+var __generator = (this && this.__generator) || function (thisArg, body) {
+    var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
+    return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
+    function verb(n) { return function (v) { return step([n, v]); }; }
+    function step(op) {
+        if (f) throw new TypeError("Generator is already executing.");
+        while (_) try {
+            if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
+            if (y = 0, t) op = [op[0] & 2, t.value];
+            switch (op[0]) {
+                case 0: case 1: t = op; break;
+                case 4: _.label++; return { value: op[1], done: false };
+                case 5: _.label++; y = op[1]; op = [0]; continue;
+                case 7: op = _.ops.pop(); _.trys.pop(); continue;
+                default:
+                    if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
+                    if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
+                    if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
+                    if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
+                    if (t[2]) _.ops.pop();
+                    _.trys.pop(); continue;
+            }
+            op = body.call(thisArg, _);
+        } catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
+        if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
+    }
+};
+var __values = (this && this.__values) || function (o) {
+    var m = typeof Symbol === "function" && o[Symbol.iterator], i = 0;
+    if (m) return m.call(o);
+    return {
+        next: function () {
+            if (o && i >= o.length) o = void 0;
+            return { value: o && o[i++], done: !o };
+        }
+    };
+};
+var __assign = (this && this.__assign) || Object.assign || function(t) {
+    for (var s, i = 1, n = arguments.length; i < n; i++) {
+        s = arguments[i];
+        for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
+            t[p] = s[p];
+    }
+    return t;
+};
+var __extends = (this && this.__extends) || (function () {
+    var extendStatics = Object.setPrototypeOf ||
+        ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
+        function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
+    return function (d, b) {
+        extendStatics(d, b);
+        function __() { this.constructor = d; }
+        d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
+    };
+})();
+var collections;
+(function (collections) {
+    var SortedMap = /** @class */ (function () {
+        function SortedMap(comparer, iterable) {
+            this._keys = [];
+            this._values = [];
+            this._version = 0;
+            this._copyOnWrite = false;
+            this._comparer = typeof comparer === "object" ? comparer.comparer : comparer;
+            this._order = typeof comparer === "object" && comparer.sort === "insertion" ? [] : undefined;
+            if (iterable) {
+                var iterator = getIterator(iterable);
+                try {
+                    for (var i = nextResult(iterator); i; i = nextResult(iterator)) {
+                        var _a = i.value, key = _a[0], value = _a[1];
+                        this.set(key, value);
+                    }
+                }
+                finally {
+                    closeIterator(iterator);
+                }
+            }
+        }
+        Object.defineProperty(SortedMap.prototype, "size", {
+            get: function () {
+                return this._keys.length;
+            },
+            enumerable: true,
+            configurable: true
+        });
+        Object.defineProperty(SortedMap.prototype, "comparer", {
+            get: function () {
+                return this._comparer;
+            },
+            enumerable: true,
+            configurable: true
+        });
+        Object.defineProperty(SortedMap.prototype, Symbol.toStringTag, {
+            get: function () {
+                return "SortedMap";
+            },
+            enumerable: true,
+            configurable: true
+        });
+        SortedMap.prototype.has = function (key) {
+            return ts.binarySearch(this._keys, key, ts.identity, this._comparer) >= 0;
+        };
+        SortedMap.prototype.get = function (key) {
+            var index = ts.binarySearch(this._keys, key, ts.identity, this._comparer);
+            return index >= 0 ? this._values[index] : undefined;
+        };
+        SortedMap.prototype.set = function (key, value) {
+            var index = ts.binarySearch(this._keys, key, ts.identity, this._comparer);
+            if (index >= 0) {
+                this._values[index] = value;
+            }
+            else {
+                this.writePreamble();
+                insertAt(this._keys, ~index, key);
+                insertAt(this._values, ~index, value);
+                if (this._order)
+                    insertAt(this._order, ~index, this._version);
+                this.writePostScript();
+            }
+            return this;
+        };
+        SortedMap.prototype.delete = function (key) {
+            var index = ts.binarySearch(this._keys, key, ts.identity, this._comparer);
+            if (index >= 0) {
+                this.writePreamble();
+                ts.orderedRemoveItemAt(this._keys, index);
+                ts.orderedRemoveItemAt(this._values, index);
+                if (this._order)
+                    ts.orderedRemoveItemAt(this._order, index);
+                this.writePostScript();
+                return true;
+            }
+            return false;
+        };
+        SortedMap.prototype.clear = function () {
+            if (this.size > 0) {
+                this.writePreamble();
+                this._keys.length = 0;
+                this._values.length = 0;
+                if (this._order)
+                    this._order.length = 0;
+                this.writePostScript();
+            }
+        };
+        SortedMap.prototype.forEach = function (callback, thisArg) {
+            var keys = this._keys;
+            var values = this._values;
+            var indices = this.getIterationOrder();
+            var version = this._version;
+            this._copyOnWrite = true;
+            try {
+                if (indices) {
+                    for (var _i = 0, indices_1 = indices; _i < indices_1.length; _i++) {
+                        var i = indices_1[_i];
+                        callback.call(thisArg, values[i], keys[i], this);
+                    }
+                }
+                else {
+                    for (var i = 0; i < keys.length; i++) {
+                        callback.call(thisArg, values[i], keys[i], this);
+                    }
+                }
+            }
+            finally {
+                if (version === this._version) {
+                    this._copyOnWrite = false;
+                }
+            }
+        };
+        SortedMap.prototype.keys = function () {
+            var keys, indices, version, _i, indices_2, i;
+            return __generator(this, function (_a) {
+                switch (_a.label) {
+                    case 0:
+                        keys = this._keys;
+                        indices = this.getIterationOrder();
+                        version = this._version;
+                        this._copyOnWrite = true;
+                        _a.label = 1;
+                    case 1:
+                        _a.trys.push([1, , 9, 10]);
+                        if (!indices) return [3 /*break*/, 6];
+                        _i = 0, indices_2 = indices;
+                        _a.label = 2;
+                    case 2:
+                        if (!(_i < indices_2.length)) return [3 /*break*/, 5];
+                        i = indices_2[_i];
+                        return [4 /*yield*/, keys[i]];
+                    case 3:
+                        _a.sent();
+                        _a.label = 4;
+                    case 4:
+                        _i++;
+                        return [3 /*break*/, 2];
+                    case 5: return [3 /*break*/, 8];
+                    case 6: return [5 /*yield**/, __values(keys)];
+                    case 7:
+                        _a.sent();
+                        _a.label = 8;
+                    case 8: return [3 /*break*/, 10];
+                    case 9:
+                        if (version === this._version) {
+                            this._copyOnWrite = false;
+                        }
+                        return [7 /*endfinally*/];
+                    case 10: return [2 /*return*/];
+                }
+            });
+        };
+        SortedMap.prototype.values = function () {
+            var values, indices, version, _i, indices_3, i;
+            return __generator(this, function (_a) {
+                switch (_a.label) {
+                    case 0:
+                        values = this._values;
+                        indices = this.getIterationOrder();
+                        version = this._version;
+                        this._copyOnWrite = true;
+                        _a.label = 1;
+                    case 1:
+                        _a.trys.push([1, , 9, 10]);
+                        if (!indices) return [3 /*break*/, 6];
+                        _i = 0, indices_3 = indices;
+                        _a.label = 2;
+                    case 2:
+                        if (!(_i < indices_3.length)) return [3 /*break*/, 5];
+                        i = indices_3[_i];
+                        return [4 /*yield*/, values[i]];
+                    case 3:
+                        _a.sent();
+                        _a.label = 4;
+                    case 4:
+                        _i++;
+                        return [3 /*break*/, 2];
+                    case 5: return [3 /*break*/, 8];
+                    case 6: return [5 /*yield**/, __values(values)];
+                    case 7:
+                        _a.sent();
+                        _a.label = 8;
+                    case 8: return [3 /*break*/, 10];
+                    case 9:
+                        if (version === this._version) {
+                            this._copyOnWrite = false;
+                        }
+                        return [7 /*endfinally*/];
+                    case 10: return [2 /*return*/];
+                }
+            });
+        };
+        SortedMap.prototype.entries = function () {
+            var keys, values, indices, version, _i, indices_4, i, i;
+            return __generator(this, function (_a) {
+                switch (_a.label) {
+                    case 0:
+                        keys = this._keys;
+                        values = this._values;
+                        indices = this.getIterationOrder();
+                        version = this._version;
+                        this._copyOnWrite = true;
+                        _a.label = 1;
+                    case 1:
+                        _a.trys.push([1, , 11, 12]);
+                        if (!indices) return [3 /*break*/, 6];
+                        _i = 0, indices_4 = indices;
+                        _a.label = 2;
+                    case 2:
+                        if (!(_i < indices_4.length)) return [3 /*break*/, 5];
+                        i = indices_4[_i];
+                        return [4 /*yield*/, [keys[i], values[i]]];
+                    case 3:
+                        _a.sent();
+                        _a.label = 4;
+                    case 4:
+                        _i++;
+                        return [3 /*break*/, 2];
+                    case 5: return [3 /*break*/, 10];
+                    case 6:
+                        i = 0;
+                        _a.label = 7;
+                    case 7:
+                        if (!(i < keys.length)) return [3 /*break*/, 10];
+                        return [4 /*yield*/, [keys[i], values[i]]];
+                    case 8:
+                        _a.sent();
+                        _a.label = 9;
+                    case 9:
+                        i++;
+                        return [3 /*break*/, 7];
+                    case 10: return [3 /*break*/, 12];
+                    case 11:
+                        if (version === this._version) {
+                            this._copyOnWrite = false;
+                        }
+                        return [7 /*endfinally*/];
+                    case 12: return [2 /*return*/];
+                }
+            });
+        };
+        SortedMap.prototype[Symbol.iterator] = function () {
+            return this.entries();
+        };
+        SortedMap.prototype.writePreamble = function () {
+            if (this._copyOnWrite) {
+                this._keys = this._keys.slice();
+                this._values = this._values.slice();
+                if (this._order)
+                    this._order = this._order.slice();
+                this._copyOnWrite = false;
+            }
+        };
+        SortedMap.prototype.writePostScript = function () {
+            this._version++;
+        };
+        SortedMap.prototype.getIterationOrder = function () {
+            if (this._order) {
+                var order_1 = this._order;
+                return this._order
+                    .map(function (_, i) { return i; })
+                    .sort(function (x, y) { return order_1[x] - order_1[y]; });
+            }
+            return undefined;
+        };
+        return SortedMap;
+    }());
+    collections.SortedMap = SortedMap;
+    function insertAt(array, index, value) {
+        if (index === 0) {
+            array.unshift(value);
+        }
+        else if (index === array.length) {
+            array.push(value);
+        }
+        else {
+            for (var i = array.length; i > index; i--) {
+                array[i] = array[i - 1];
+            }
+            array[index] = value;
+        }
+    }
+    collections.insertAt = insertAt;
+    function getIterator(iterable) {
+        return iterable[Symbol.iterator]();
+    }
+    collections.getIterator = getIterator;
+    function nextResult(iterator) {
+        var result = iterator.next();
+        return result.done ? undefined : result;
+    }
+    collections.nextResult = nextResult;
+    function closeIterator(iterator) {
+        var fn = iterator.return;
+        if (typeof fn === "function")
+            fn.call(iterator);
+    }
+    collections.closeIterator = closeIterator;
+    /**
+     * A collection of metadata that supports inheritance.
+     */
+    var Metadata = /** @class */ (function () {
+        function Metadata(parent) {
+            this._version = 0;
+            this._size = -1;
+            this._parent = parent;
+            this._map = Object.create(parent ? parent._map : null); // tslint:disable-line:no-null-keyword
+        }
+        Object.defineProperty(Metadata.prototype, "size", {
+            get: function () {
+                if (this._size === -1 || (this._parent && this._parent._version !== this._parentVersion)) {
+                    var size = 0;
+                    for (var _ in this._map)
+                        size++;
+                    this._size = size;
+                    if (this._parent) {
+                        this._parentVersion = this._parent._version;
+                    }
+                }
+                return this._size;
+            },
+            enumerable: true,
+            configurable: true
+        });
+        Object.defineProperty(Metadata.prototype, "parent", {
+            get: function () {
+                return this._parent;
+            },
+            enumerable: true,
+            configurable: true
+        });
+        Metadata.prototype.has = function (key) {
+            return this._map[Metadata._escapeKey(key)] !== undefined;
+        };
+        Metadata.prototype.get = function (key) {
+            var value = this._map[Metadata._escapeKey(key)];
+            return value === Metadata._undefinedValue ? undefined : value;
+        };
+        Metadata.prototype.set = function (key, value) {
+            this._map[Metadata._escapeKey(key)] = value === undefined ? Metadata._undefinedValue : value;
+            this._size = -1;
+            this._version++;
+            return this;
+        };
+        Metadata.prototype.delete = function (key) {
+            var escapedKey = Metadata._escapeKey(key);
+            if (this._map[escapedKey] !== undefined) {
+                delete this._map[escapedKey];
+                this._size = -1;
+                this._version++;
+                return true;
+            }
+            return false;
+        };
+        Metadata.prototype.clear = function () {
+            this._map = Object.create(this._parent ? this._parent._map : null); // tslint:disable-line:no-null-keyword
+            this._size = -1;
+            this._version++;
+        };
+        Metadata.prototype.forEach = function (callback) {
+            for (var key in this._map) {
+                callback(this._map[key], Metadata._unescapeKey(key), this);
+            }
+        };
+        Metadata._escapeKey = function (text) {
+            return (text.length >= 2 && text.charAt(0) === "_" && text.charAt(1) === "_" ? "_" + text : text);
+        };
+        Metadata._unescapeKey = function (text) {
+            return (text.length >= 3 && text.charAt(0) === "_" && text.charAt(1) === "_" && text.charAt(2) === "_" ? text.slice(1) : text);
+        };
+        Metadata._undefinedValue = {};
+        return Metadata;
+    }());
+    collections.Metadata = Metadata;
+})(collections || (collections = {}));
+/**
+ * Common utilities
+ */
+var utils;
+(function (utils) {
+    var testPathPrefixRegExp = /(?:(file:\/{3})|\/)\.(ts|lib|src)\//g;
+    function removeTestPathPrefixes(text, retainTrailingDirectorySeparator) {
+        return text !== undefined ? text.replace(testPathPrefixRegExp, function (_, scheme) { return scheme || (retainTrailingDirectorySeparator ? "/" : ""); }) : undefined; // TODO: GH#18217
+    }
+    utils.removeTestPathPrefixes = removeTestPathPrefixes;
+    /**
+     * Removes leading indentation from a template literal string.
+     */
+    function dedent(array) {
+        var args = [];
+        for (var _i = 1; _i < arguments.length; _i++) {
+            args[_i - 1] = arguments[_i];
+        }
+        var text = array[0];
+        for (var i = 0; i < args.length; i++) {
+            text += args[i];
+            text += array[i + 1];
+        }
+        var lineTerminatorRegExp = /\r\n?|\n/g;
+        var lines = [];
+        var lineTerminators = [];
+        var match;
+        var lineStart = 0;
+        while (match = lineTerminatorRegExp.exec(text)) {
+            if (lineStart !== match.index || lines.length > 0) {
+                lines.push(text.slice(lineStart, match.index));
+                lineTerminators.push(match[0]);
+            }
+            lineStart = match.index + match[0].length;
+        }
+        if (lineStart < text.length) {
+            lines.push(text.slice(lineStart));
+        }
+        var indentation = guessIndentation(lines);
+        var result = "";
+        for (var i = 0; i < lines.length; i++) {
+            var lineText = lines[i];
+            var line = indentation ? lineText.slice(indentation) : lineText;
+            result += line;
+            if (i < lineTerminators.length) {
+                result += lineTerminators[i];
+            }
+        }
+        return result;
+    }
+    utils.dedent = dedent;
+    function guessIndentation(lines) {
+        var indentation;
+        for (var _i = 0, lines_1 = lines; _i < lines_1.length; _i++) {
+            var line = lines_1[_i];
+            for (var i = 0; i < line.length && (indentation === undefined || i < indentation); i++) {
+                if (!ts.isWhiteSpaceLike(line.charCodeAt(i))) {
+                    if (indentation === undefined || i < indentation) {
+                        indentation = i;
+                        break;
+                    }
+                }
+            }
+        }
+        return indentation;
+    }
+    function toUtf8(text) {
+        return new Buffer(text).toString("utf8");
+    }
+    utils.toUtf8 = toUtf8;
+    function getByteOrderMarkLength(text) {
+        if (text.length >= 1) {
+            var ch0 = text.charCodeAt(0);
+            if (ch0 === 0xfeff)
+                return 1;
+            if (ch0 === 0xfe)
+                return text.length >= 2 && text.charCodeAt(1) === 0xff ? 2 : 0;
+            if (ch0 === 0xff)
+                return text.length >= 2 && text.charCodeAt(1) === 0xfe ? 2 : 0;
+            if (ch0 === 0xef)
+                return text.length >= 3 && text.charCodeAt(1) === 0xbb && text.charCodeAt(2) === 0xbf ? 3 : 0;
+        }
+        return 0;
+    }
+    utils.getByteOrderMarkLength = getByteOrderMarkLength;
+    function removeByteOrderMark(text) {
+        var length = getByteOrderMarkLength(text);
+        return length ? text.slice(length) : text;
+    }
+    utils.removeByteOrderMark = removeByteOrderMark;
+    function addUTF8ByteOrderMark(text) {
+        return getByteOrderMarkLength(text) === 0 ? "\u00EF\u00BB\u00BF" + text : text;
+    }
+    utils.addUTF8ByteOrderMark = addUTF8ByteOrderMark;
+})(utils || (utils = {}));
+// NOTE: The contents of this file are all exported from the namespace 'documents'. This is to
+//       support the eventual conversion of harness into a modular system.
+var documents;
+(function (documents) {
+    var TextDocument = /** @class */ (function () {
+        function TextDocument(file, text, meta) {
+            this.file = file;
+            this.text = text;
+            this.meta = meta || new Map();
+        }
+        Object.defineProperty(TextDocument.prototype, "lineStarts", {
+            get: function () {
+                return this._lineStarts || (this._lineStarts = ts.computeLineStarts(this.text));
+            },
+            enumerable: true,
+            configurable: true
+        });
+        TextDocument.fromTestFile = function (file) {
+            return new TextDocument(file.unitName, file.content, file.fileOptions && Object.keys(file.fileOptions)
+                .reduce(function (meta, key) { return meta.set(key, file.fileOptions[key]); }, new Map()));
+        };
+        TextDocument.prototype.asTestFile = function () {
+            return this._testFile || (this._testFile = {
+                unitName: this.file,
+                content: this.text,
+                fileOptions: Array.from(this.meta)
+                    .reduce(function (obj, _a) {
+                    var key = _a[0], value = _a[1];
+                    return (obj[key] = value, obj);
+                }, {})
+            });
+        };
+        return TextDocument;
+    }());
+    documents.TextDocument = TextDocument;
+    var SourceMap = /** @class */ (function () {
+        function SourceMap(mapFile, data) {
+            this.sources = [];
+            this.mappings = [];
+            this._emittedLineMappings = [];
+            this._sourceLineMappings = [];
+            this.raw = typeof data === "string" ? JSON.parse(data) : data;
+            this.mapFile = mapFile;
+            this.version = this.raw.version;
+            this.file = this.raw.file;
+            this.sourceRoot = this.raw.sourceRoot;
+            this.sources = this.raw.sources;
+            this.sourcesContent = this.raw.sourcesContent;
+            this.names = this.raw.names;
+            // populate mappings
+            var mappings = [];
+            var emittedLine = 0;
+            var emittedColumn = 0;
+            var sourceIndex = 0;
+            var sourceLine = 0;
+            var sourceColumn = 0;
+            var nameIndex = 0;
+            var match;
+            while (match = SourceMap._mappingRegExp.exec(this.raw.mappings)) {
+                if (match[1]) {
+                    var segment = SourceMap._decodeVLQ(match[1]);
+                    if (segment.length !== 1 && segment.length !== 4 && segment.length !== 5) {
+                        throw new Error("Invalid VLQ");
+                    }
+                    emittedColumn += segment[0];
+                    if (segment.length >= 4) {
+                        sourceIndex += segment[1];
+                        sourceLine += segment[2];
+                        sourceColumn += segment[3];
+                    }
+                    var mapping = { mappingIndex: mappings.length, emittedLine: emittedLine, emittedColumn: emittedColumn, sourceIndex: sourceIndex, sourceLine: sourceLine, sourceColumn: sourceColumn };
+                    if (segment.length === 5) {
+                        nameIndex += segment[4];
+                        mapping.nameIndex = nameIndex;
+                    }
+                    mappings.push(mapping);
+                    var mappingsForEmittedLine = this._emittedLineMappings[mapping.emittedLine] || (this._emittedLineMappings[mapping.emittedLine] = []);
+                    mappingsForEmittedLine.push(mapping);
+                    var mappingsForSource = this._sourceLineMappings[mapping.sourceIndex] || (this._sourceLineMappings[mapping.sourceIndex] = []);
+                    var mappingsForSourceLine = mappingsForSource[mapping.sourceLine] || (mappingsForSource[mapping.sourceLine] = []);
+                    mappingsForSourceLine.push(mapping);
+                }
+                else if (match[2]) {
+                    emittedLine++;
+                    emittedColumn = 0;
+                }
+                else {
+                    throw new Error("Unrecognized character '" + match[0] + "'.");
+                }
+            }
+            this.mappings = mappings;
+        }
+        SourceMap.getUrl = function (text) {
+            var match;
+            var lastMatch;
+            while (match = SourceMap._sourceMappingURLRegExp.exec(text)) {
+                lastMatch = match;
+            }
+            return lastMatch ? lastMatch[1] : undefined;
+        };
+        SourceMap.fromUrl = function (url) {
+            var match = SourceMap._dataURLRegExp.exec(url);
+            return match ? new SourceMap(/*mapFile*/ undefined, new Buffer(match[1], "base64").toString("utf8")) : undefined;
+        };
+        SourceMap.fromSource = function (text) {
+            var url = this.getUrl(text);
+            return url === undefined ? undefined : this.fromUrl(url);
+        };
+        SourceMap.prototype.getMappingsForEmittedLine = function (emittedLine) {
+            return this._emittedLineMappings[emittedLine];
+        };
+        SourceMap.prototype.getMappingsForSourceLine = function (sourceIndex, sourceLine) {
+            var mappingsForSource = this._sourceLineMappings[sourceIndex];
+            return mappingsForSource && mappingsForSource[sourceLine];
+        };
+        SourceMap._decodeVLQ = function (text) {
+            var vlq = [];
+            var shift = 0;
+            var value = 0;
+            for (var i = 0; i < text.length; i++) {
+                var currentByte = SourceMap._base64Chars.indexOf(text.charAt(i));
+                value += (currentByte & 31) << shift;
+                if ((currentByte & 32) === 0) {
+                    vlq.push(value & 1 ? -(value >>> 1) : value >>> 1);
+                    shift = 0;
+                    value = 0;
+                }
+                else {
+                    shift += 5;
+                }
+            }
+            return vlq;
+        };
+        SourceMap._mappingRegExp = /([A-Za-z0-9+/]+),?|(;)|./g;
+        SourceMap._sourceMappingURLRegExp = /^\/\/[#@]\s*sourceMappingURL\s*=\s*(.*?)\s*$/mig;
+        SourceMap._dataURLRegExp = /^data:application\/json;base64,([a-z0-9+/=]+)$/i;
+        SourceMap._base64Chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+        return SourceMap;
+    }());
+    documents.SourceMap = SourceMap;
+})(documents || (documents = {}));
+var vpath;
+(function (vpath) {
+    vpath.sep = ts.directorySeparator;
+    vpath.normalizeSeparators = ts.normalizeSlashes;
+    vpath.isAbsolute = ts.isRootedDiskPath;
+    vpath.isRoot = ts.isDiskPathRoot;
+    vpath.hasTrailingSeparator = ts.hasTrailingDirectorySeparator;
+    vpath.addTrailingSeparator = ts.ensureTrailingDirectorySeparator;
+    vpath.removeTrailingSeparator = ts.removeTrailingDirectorySeparator;
+    vpath.normalize = ts.normalizePath;
+    vpath.combine = ts.combinePaths;
+    vpath.parse = ts.getPathComponents;
+    vpath.reduce = ts.reducePathComponents;
+    vpath.format = ts.getPathFromPathComponents;
+    vpath.resolve = ts.resolvePath;
+    vpath.compare = ts.comparePaths;
+    vpath.compareCaseSensitive = ts.comparePathsCaseSensitive;
+    vpath.compareCaseInsensitive = ts.comparePathsCaseInsensitive;
+    vpath.dirname = ts.getDirectoryPath;
+    vpath.basename = ts.getBaseFileName;
+    vpath.extname = ts.getAnyExtensionFromPath;
+    vpath.relative = ts.getRelativePathFromDirectory;
+    vpath.beneath = ts.containsPath;
+    vpath.changeExtension = ts.changeAnyExtension;
+    vpath.isTypeScript = ts.hasTypeScriptFileExtension;
+    vpath.isJavaScript = ts.hasJavaScriptFileExtension;
+    var invalidRootComponentRegExp = /^(?!(\/|\/\/\w+\/|[a-zA-Z]:\/?|)$)/;
+    var invalidNavigableComponentRegExp = /[:*?"<>|]/;
+    var invalidNavigableComponentWithWildcardsRegExp = /[:"<>|]/;
+    var invalidNonNavigableComponentRegExp = /^\.{1,2}$|[:*?"<>|]/;
+    var invalidNonNavigableComponentWithWildcardsRegExp = /^\.{1,2}$|[:"<>|]/;
+    var extRegExp = /\.\w+$/;
+    var ValidationFlags;
+    (function (ValidationFlags) {
+        ValidationFlags[ValidationFlags["None"] = 0] = "None";
+        ValidationFlags[ValidationFlags["RequireRoot"] = 1] = "RequireRoot";
+        ValidationFlags[ValidationFlags["RequireDirname"] = 2] = "RequireDirname";
+        ValidationFlags[ValidationFlags["RequireBasename"] = 4] = "RequireBasename";
+        ValidationFlags[ValidationFlags["RequireExtname"] = 8] = "RequireExtname";
+        ValidationFlags[ValidationFlags["RequireTrailingSeparator"] = 16] = "RequireTrailingSeparator";
+        ValidationFlags[ValidationFlags["AllowRoot"] = 32] = "AllowRoot";
+        ValidationFlags[ValidationFlags["AllowDirname"] = 64] = "AllowDirname";
+        ValidationFlags[ValidationFlags["AllowBasename"] = 128] = "AllowBasename";
+        ValidationFlags[ValidationFlags["AllowExtname"] = 256] = "AllowExtname";
+        ValidationFlags[ValidationFlags["AllowTrailingSeparator"] = 512] = "AllowTrailingSeparator";
+        ValidationFlags[ValidationFlags["AllowNavigation"] = 1024] = "AllowNavigation";
+        ValidationFlags[ValidationFlags["AllowWildcard"] = 2048] = "AllowWildcard";
+        /** Path must be a valid directory root */
+        ValidationFlags[ValidationFlags["Root"] = 545] = "Root";
+        /** Path must be a absolute */
+        ValidationFlags[ValidationFlags["Absolute"] = 2017] = "Absolute";
+        /** Path may be relative or absolute */
+        ValidationFlags[ValidationFlags["RelativeOrAbsolute"] = 2016] = "RelativeOrAbsolute";
+        /** Path may only be a filename */
+        ValidationFlags[ValidationFlags["Basename"] = 260] = "Basename";
+    })(ValidationFlags = vpath.ValidationFlags || (vpath.ValidationFlags = {}));
+    function validateComponents(components, flags, hasTrailingSeparator) {
+        var hasRoot = !!components[0];
+        var hasDirname = components.length > 2;
+        var hasBasename = components.length > 1;
+        var hasExtname = hasBasename && extRegExp.test(components[components.length - 1]);
+        var invalidComponentRegExp = flags & 1024 /* AllowNavigation */
+            ? flags & 2048 /* AllowWildcard */ ? invalidNavigableComponentWithWildcardsRegExp : invalidNavigableComponentRegExp
+            : flags & 2048 /* AllowWildcard */ ? invalidNonNavigableComponentWithWildcardsRegExp : invalidNonNavigableComponentRegExp;
+        // Validate required components
+        if (flags & 1 /* RequireRoot */ && !hasRoot)
+            return false;
+        if (flags & 2 /* RequireDirname */ && !hasDirname)
+            return false;
+        if (flags & 4 /* RequireBasename */ && !hasBasename)
+            return false;
+        if (flags & 8 /* RequireExtname */ && !hasExtname)
+            return false;
+        if (flags & 16 /* RequireTrailingSeparator */ && !hasTrailingSeparator)
+            return false;
+        // Required components indicate allowed components
+        if (flags & 1 /* RequireRoot */)
+            flags |= 32 /* AllowRoot */;
+        if (flags & 2 /* RequireDirname */)
+            flags |= 64 /* AllowDirname */;
+        if (flags & 4 /* RequireBasename */)
+            flags |= 128 /* AllowBasename */;
+        if (flags & 8 /* RequireExtname */)
+            flags |= 256 /* AllowExtname */;
+        if (flags & 16 /* RequireTrailingSeparator */)
+            flags |= 512 /* AllowTrailingSeparator */;
+        // Validate disallowed components
+        if (~flags & 32 /* AllowRoot */ && hasRoot)
+            return false;
+        if (~flags & 64 /* AllowDirname */ && hasDirname)
+            return false;
+        if (~flags & 128 /* AllowBasename */ && hasBasename)
+            return false;
+        if (~flags & 256 /* AllowExtname */ && hasExtname)
+            return false;
+        if (~flags & 512 /* AllowTrailingSeparator */ && hasTrailingSeparator)
+            return false;
+        // Validate component strings
+        if (invalidRootComponentRegExp.test(components[0]))
+            return false;
+        for (var i = 1; i < components.length; i++) {
+            if (invalidComponentRegExp.test(components[i]))
+                return false;
+        }
+        return true;
+    }
+    function validate(path, flags) {
+        if (flags === void 0) { flags = 2016 /* RelativeOrAbsolute */; }
+        var components = vpath.parse(path);
+        var trailing = vpath.hasTrailingSeparator(path);
+        if (!validateComponents(components, flags, trailing))
+            throw vfs.createIOError("ENOENT");
+        return components.length > 1 && trailing ? vpath.format(vpath.reduce(components)) + vpath.sep : vpath.format(vpath.reduce(components));
+    }
+    vpath.validate = validate;
+    function isDeclaration(path) {
+        return vpath.extname(path, ".d.ts", /*ignoreCase*/ false).length > 0;
+    }
+    vpath.isDeclaration = isDeclaration;
+    function isSourceMap(path) {
+        return vpath.extname(path, ".map", /*ignoreCase*/ false).length > 0;
+    }
+    vpath.isSourceMap = isSourceMap;
+    var javaScriptSourceMapExtensions = [".js.map", ".jsx.map"];
+    function isJavaScriptSourceMap(path) {
+        return vpath.extname(path, javaScriptSourceMapExtensions, /*ignoreCase*/ false).length > 0;
+    }
+    vpath.isJavaScriptSourceMap = isJavaScriptSourceMap;
+    function isJson(path) {
+        return vpath.extname(path, ".json", /*ignoreCase*/ false).length > 0;
+    }
+    vpath.isJson = isJson;
+    function isDefaultLibrary(path) {
+        return isDeclaration(path)
+            && vpath.basename(path).startsWith("lib.");
+    }
+    vpath.isDefaultLibrary = isDefaultLibrary;
+    function isTsConfigFile(path) {
+        return path.indexOf("tsconfig") !== -1 && path.indexOf("json") !== -1;
+    }
+    vpath.isTsConfigFile = isTsConfigFile;
+})(vpath || (vpath = {}));
+// tslint:disable:no-null-keyword
+var vfs;
+(function (vfs) {
+    /**
+     * Posix-style path to the TypeScript compiler build outputs (including tsc.js, lib.d.ts, etc.)
+     */
+    vfs.builtFolder = "/.ts";
+    /**
+     * Posix-style path to additional mountable folders (./tests/projects in this repo)
+     */
+    vfs.projectsFolder = "/.projects";
+    /**
+     * Posix-style path to additional test libraries
+     */
+    vfs.testLibFolder = "/.lib";
+    /**
+     * Posix-style path to sources under test
+     */
+    vfs.srcFolder = "/.src";
+    // file type
+    var S_IFMT = 61440; // file type
+    var S_IFSOCK = 49152; // socket
+    var S_IFLNK = 40960; // symbolic link
+    var S_IFREG = 32768; // regular file
+    var S_IFBLK = 24576; // block device
+    var S_IFDIR = 16384; // directory
+    var S_IFCHR = 8192; // character device
+    var S_IFIFO = 4096; // FIFO
+    var devCount = 0; // A monotonically increasing count of device ids
+    var inoCount = 0; // A monotonically increasing count of inodes
+    /**
+     * Represents a virtual POSIX-like file system.
+     */
+    var FileSystem = /** @class */ (function () {
+        function FileSystem(ignoreCase, options) {
+            if (options === void 0) { options = {}; }
+            // lazy-initialized state that should be mutable even if the FileSystem is frozen.
+            this._lazy = {};
+            var _a = options.time, time = _a === void 0 ? -1 : _a, files = options.files, meta = options.meta;
+            this.ignoreCase = ignoreCase;
+            this.stringComparer = this.ignoreCase ? vpath.compareCaseInsensitive : vpath.compareCaseSensitive;
+            this._time = time;
+            if (meta) {
+                for (var _i = 0, _b = Object.keys(meta); _i < _b.length; _i++) {
+                    var key = _b[_i];
+                    this.meta.set(key, meta[key]);
+                }
+            }
+            if (files) {
+                this._applyFiles(files, /*dirname*/ "");
+            }
+            var cwd = options.cwd;
+            if ((!cwd || !vpath.isRoot(cwd)) && this._lazy.links) {
+                var iterator = collections.getIterator(this._lazy.links.keys());
+                try {
+                    for (var i = collections.nextResult(iterator); i; i = collections.nextResult(iterator)) {
+                        var name = i.value;
+                        cwd = cwd ? vpath.resolve(name, cwd) : name;
+                        break;
+                    }
+                }
+                finally {
+                    collections.closeIterator(iterator);
+                }
+            }
+            if (cwd) {
+                vpath.validate(cwd, 2017 /* Absolute */);
+                this.mkdirpSync(cwd);
+            }
+            this._cwd = cwd || "";
+        }
+        Object.defineProperty(FileSystem.prototype, "meta", {
+            /**
+             * Gets metadata for this `FileSystem`.
+             */
+            get: function () {
+                if (!this._lazy.meta) {
+                    this._lazy.meta = new collections.Metadata(this._shadowRoot ? this._shadowRoot.meta : undefined);
+                }
+                return this._lazy.meta;
+            },
+            enumerable: true,
+            configurable: true
+        });
+        Object.defineProperty(FileSystem.prototype, "isReadonly", {
+            /**
+             * Gets a value indicating whether the file system is read-only.
+             */
+            get: function () {
+                return Object.isFrozen(this);
+            },
+            enumerable: true,
+            configurable: true
+        });
+        /**
+         * Makes the file system read-only.
+         */
+        FileSystem.prototype.makeReadonly = function () {
+            Object.freeze(this);
+            return this;
+        };
+        Object.defineProperty(FileSystem.prototype, "shadowRoot", {
+            /**
+             * Gets the file system shadowed by this file system.
+             */
+            get: function () {
+                return this._shadowRoot;
+            },
+            enumerable: true,
+            configurable: true
+        });
+        /**
+         * Gets a shadow copy of this file system. Changes to the shadow copy do not affect the
+         * original, allowing multiple copies of the same core file system without multiple copies
+         * of the same data.
+         */
+        FileSystem.prototype.shadow = function (ignoreCase) {
+            if (ignoreCase === void 0) { ignoreCase = this.ignoreCase; }
+            if (!this.isReadonly)
+                throw new Error("Cannot shadow a mutable file system.");
+            if (ignoreCase && !this.ignoreCase)
+                throw new Error("Cannot create a case-insensitive file system from a case-sensitive one.");
+            var fs = new FileSystem(ignoreCase, { time: this._time });
+            fs._shadowRoot = this;
+            fs._cwd = this._cwd;
+            return fs;
+        };
+        /**
+         * Gets or sets the timestamp (in milliseconds) used for file status, returning the previous timestamp.
+         *
+         * @link http://pubs.opengroup.org/onlinepubs/9699919799/functions/time.html
+         */
+        FileSystem.prototype.time = function (value) {
+            if (value !== undefined && this.isReadonly)
+                throw createIOError("EPERM");
+            var result = this._time;
+            if (typeof result === "function")
+                result = result();
+            if (typeof result === "object")
+                result = result.getTime();
+            if (result === -1)
+                result = Date.now();
+            if (value !== undefined) {
+                this._time = value;
+            }
+            return result;
+        };
+        /**
+         * Gets the metadata object for a path.
+         * @param path
+         */
+        FileSystem.prototype.filemeta = function (path) {
+            var node = this._walk(this._resolve(path)).node;
+            if (!node)
+                throw createIOError("ENOENT");
+            return this._filemeta(node);
+        };
+        FileSystem.prototype._filemeta = function (node) {
+            if (!node.meta) {
+                var parentMeta = node.shadowRoot && this._shadowRoot && this._shadowRoot._filemeta(node.shadowRoot);
+                node.meta = new collections.Metadata(parentMeta);
+            }
+            return node.meta;
+        };
+        /**
+         * Get the pathname of the current working directory.
+         *
+         * @link - http://pubs.opengroup.org/onlinepubs/9699919799/functions/getcwd.html
+         */
+        FileSystem.prototype.cwd = function () {
+            if (!this._cwd)
+                throw new Error("The current working directory has not been set.");
+            var node = this._walk(this._cwd).node;
+            if (!node)
+                throw createIOError("ENOENT");
+            if (!isDirectory(node))
+                throw createIOError("ENOTDIR");
+            return this._cwd;
+        };
+        /**
+         * Changes the current working directory.
+         *
+         * @link http://pubs.opengroup.org/onlinepubs/9699919799/functions/chdir.html
+         */
+        FileSystem.prototype.chdir = function (path) {
+            if (this.isReadonly)
+                throw createIOError("EPERM");
+            path = this._resolve(path);
+            var node = this._walk(path).node;
+            if (!node)
+                throw createIOError("ENOENT");
+            if (!isDirectory(node))
+                throw createIOError("ENOTDIR");
+            this._cwd = path;
+        };
+        /**
+         * Pushes the current directory onto the directory stack and changes the current working directory to the supplied path.
+         */
+        FileSystem.prototype.pushd = function (path) {
+            if (this.isReadonly)
+                throw createIOError("EPERM");
+            if (path)
+                path = this._resolve(path);
+            if (this._cwd) {
+                if (!this._dirStack)
+                    this._dirStack = [];
+                this._dirStack.push(this._cwd);
+            }
+            if (path && path !== this._cwd) {
+                this.chdir(path);
+            }
+        };
+        /**
+         * Pops the previous directory from the location stack and changes the current directory to that directory.
+         */
+        FileSystem.prototype.popd = function () {
+            if (this.isReadonly)
+                throw createIOError("EPERM");
+            var path = this._dirStack && this._dirStack.pop();
+            if (path) {
+                this.chdir(path);
+            }
+        };
+        /**
+         * Update the file system with a set of files.
+         */
+        FileSystem.prototype.apply = function (files) {
+            this._applyFiles(files, this._cwd);
+        };
+        /**
+         * Scan file system entries along a path. If `path` is a symbolic link, it is dereferenced.
+         * @param path The path at which to start the scan.
+         * @param axis The axis along which to traverse.
+         * @param traversal The traversal scheme to use.
+         */
+        FileSystem.prototype.scanSync = function (path, axis, traversal) {
+            path = this._resolve(path);
+            var results = [];
+            this._scan(path, this._stat(this._walk(path)), axis, traversal, /*noFollow*/ false, results);
+            return results;
+        };
+        /**
+         * Scan file system entries along a path.
+         * @param path The path at which to start the scan.
+         * @param axis The axis along which to traverse.
+         * @param traversal The traversal scheme to use.
+         */
+        FileSystem.prototype.lscanSync = function (path, axis, traversal) {
+            path = this._resolve(path);
+            var results = [];
+            this._scan(path, this._stat(this._walk(path, /*noFollow*/ true)), axis, traversal, /*noFollow*/ true, results);
+            return results;
+        };
+        FileSystem.prototype._scan = function (path, stats, axis, traversal, noFollow, results) {
+            if (axis === "ancestors-or-self" || axis === "self" || axis === "descendants-or-self") {
+                if (!traversal.accept || traversal.accept(path, stats)) {
+                    results.push(path);
+                }
+            }
+            if (axis === "ancestors-or-self" || axis === "ancestors") {
+                var dirname = vpath.dirname(path);
+                if (dirname !== path) {
+                    try {
+                        var stats_1 = this._stat(this._walk(dirname, noFollow));
+                        if (!traversal.traverse || traversal.traverse(dirname, stats_1)) {
+                            this._scan(dirname, stats_1, "ancestors-or-self", traversal, noFollow, results);
+                        }
+                    }
+                    catch ( /*ignored*/_a) { /*ignored*/ }
+                }
+            }
+            if (axis === "descendants-or-self" || axis === "descendants") {
+                if (stats.isDirectory() && (!traversal.traverse || traversal.traverse(path, stats))) {
+                    for (var _i = 0, _b = this.readdirSync(path); _i < _b.length; _i++) {
+                        var file = _b[_i];
+                        try {
+                            var childpath = vpath.combine(path, file);
+                            var stats_2 = this._stat(this._walk(childpath, noFollow));
+                            this._scan(childpath, stats_2, "descendants-or-self", traversal, noFollow, results);
+                        }
+                        catch ( /*ignored*/_c) { /*ignored*/ }
+                    }
+                }
+            }
+        };
+        /**
+         * Mounts a physical or virtual file system at a location in this virtual file system.
+         *
+         * @param source The path in the physical (or other virtual) file system.
+         * @param target The path in this virtual file system.
+         * @param resolver An object used to resolve files in `source`.
+         */
+        FileSystem.prototype.mountSync = function (source, target, resolver) {
+            if (this.isReadonly)
+                throw createIOError("EROFS");
+            source = vpath.validate(source, 2017 /* Absolute */);
+            var _a = this._walk(this._resolve(target), /*noFollow*/ true), parent = _a.parent, links = _a.links, existingNode = _a.node, basename = _a.basename;
+            if (existingNode)
+                throw createIOError("EEXIST");
+            var time = this.time();
+            var node = this._mknod(parent ? parent.dev : ++devCount, S_IFDIR, /*mode*/ 511, time);
+            node.source = source;
+            node.resolver = resolver;
+            this._addLink(parent, links, basename, node, time);
+        };
+        /**
+         * Recursively remove all files and directories underneath the provided path.
+         */
+        FileSystem.prototype.rimrafSync = function (path) {
+            try {
+                var stats = this.lstatSync(path);
+                if (stats.isFile() || stats.isSymbolicLink()) {
+                    this.unlinkSync(path);
+                }
+                else if (stats.isDirectory()) {
+                    for (var _i = 0, _a = this.readdirSync(path); _i < _a.length; _i++) {
+                        var file = _a[_i];
+                        this.rimrafSync(vpath.combine(path, file));
+                    }
+                    this.rmdirSync(path);
+                }
+            }
+            catch (e) {
+                if (e.code === "ENOENT")
+                    return;
+                throw e;
+            }
+        };
+        /**
+         * Make a directory and all of its parent paths (if they don't exist).
+         */
+        FileSystem.prototype.mkdirpSync = function (path) {
+            var _this = this;
+            path = this._resolve(path);
+            var result = this._walk(path, /*noFollow*/ true, function (error, result) {
+                if (error.code === "ENOENT") {
+                    _this._mkdir(result);
+                    return "retry";
+                }
+                return "throw";
+            });
+            if (!result.node)
+                this._mkdir(result);
+        };
+        FileSystem.prototype.getFileListing = function () {
+            var _this = this;
+            var result = "";
+            var printLinks = function (dirname, links) {
+                var iterator = collections.getIterator(links);
+                try {
+                    for (var i = collections.nextResult(iterator); i; i = collections.nextResult(iterator)) {
+                        var _a = i.value, name = _a[0], node = _a[1];
+                        var path = dirname ? vpath.combine(dirname, name) : name;
+                        var marker = vpath.compare(_this._cwd, path, _this.ignoreCase) === 0 ? "*" : " ";
+                        if (result)
+                            result += "\n";
+                        result += marker;
+                        if (isDirectory(node)) {
+                            result += vpath.addTrailingSeparator(path);
+                            printLinks(path, _this._getLinks(node));
+                        }
+                        else if (isFile(node)) {
+                            result += path;
+                        }
+                        else if (isSymlink(node)) {
+                            result += path + " -> " + node.symlink;
+                        }
+                    }
+                }
+                finally {
+                    collections.closeIterator(iterator);
+                }
+            };
+            printLinks(/*dirname*/ undefined, this._getRootLinks());
+            return result;
+        };
+        /**
+         * Print diagnostic information about the structure of the file system to the console.
+         */
+        FileSystem.prototype.debugPrint = function () {
+            console.log(this.getFileListing());
+        };
+        // POSIX API (aligns with NodeJS "fs" module API)
+        /**
+         * Determines whether a path exists.
+         */
+        FileSystem.prototype.existsSync = function (path) {
+            var result = this._walk(this._resolve(path), /*noFollow*/ true, function () { return "stop"; });
+            return result !== undefined && result.node !== undefined;
+        };
+        /**
+         * Get file status. If `path` is a symbolic link, it is dereferenced.
+         *
+         * @link http://pubs.opengroup.org/onlinepubs/9699919799/functions/stat.html
+         *
+         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
+         */
+        FileSystem.prototype.statSync = function (path) {
+            return this._stat(this._walk(this._resolve(path)));
+        };
+        /**
+         * Change file access times
+         *
+         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
+         */
+        FileSystem.prototype.utimesSync = function (path, atime, mtime) {
+            if (this.isReadonly)
+                throw createIOError("EROFS");
+            if (!isFinite(+atime) || !isFinite(+mtime))
+                throw createIOError("EINVAL");
+            var entry = this._walk(this._resolve(path));
+            if (!entry || !entry.node) {
+                throw createIOError("ENOENT");
+            }
+            entry.node.atimeMs = +atime;
+            entry.node.mtimeMs = +mtime;
+            entry.node.ctimeMs = this.time();
+        };
+        /**
+         * Get file status. If `path` is a symbolic link, it is dereferenced.
+         *
+         * @link http://pubs.opengroup.org/onlinepubs/9699919799/functions/lstat.html
+         *
+         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
+         */
+        FileSystem.prototype.lstatSync = function (path) {
+            return this._stat(this._walk(this._resolve(path), /*noFollow*/ true));
+        };
+        FileSystem.prototype._stat = function (entry) {
+            var node = entry.node;
+            if (!node)
+                throw createIOError("ENOENT", entry.realpath);
+            return new Stats(node.dev, node.ino, node.mode, node.nlink, 
+            /*rdev*/ 0, 
+            /*size*/ isFile(node) ? this._getSize(node) : isSymlink(node) ? node.symlink.length : 0, 
+            /*blksize*/ 4096, 
+            /*blocks*/ 0, node.atimeMs, node.mtimeMs, node.ctimeMs, node.birthtimeMs);
+        };
+        /**
+         * Read a directory. If `path` is a symbolic link, it is dereferenced.
+         *
+         * @link http://pubs.opengroup.org/onlinepubs/9699919799/functions/readdir.html
+         *
+         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
+         */
+        FileSystem.prototype.readdirSync = function (path) {
+            var node = this._walk(this._resolve(path)).node;
+            if (!node)
+                throw createIOError("ENOENT");
+            if (!isDirectory(node))
+                throw createIOError("ENOTDIR");
+            return Array.from(this._getLinks(node).keys());
+        };
+        /**
+         * Make a directory.
+         *
+         * @link http://pubs.opengroup.org/onlinepubs/9699919799/functions/mkdir.html
+         *
+         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
+         */
+        FileSystem.prototype.mkdirSync = function (path) {
+            if (this.isReadonly)
+                throw createIOError("EROFS");
+            this._mkdir(this._walk(this._resolve(path), /*noFollow*/ true));
+        };
+        FileSystem.prototype._mkdir = function (_a) {
+            var parent = _a.parent, links = _a.links, existingNode = _a.node, basename = _a.basename;
+            if (existingNode)
+                throw createIOError("EEXIST");
+            var time = this.time();
+            var node = this._mknod(parent ? parent.dev : ++devCount, S_IFDIR, /*mode*/ 511, time);
+            this._addLink(parent, links, basename, node, time);
+        };
+        /**
+         * Remove a directory.
+         *
+         * @link http://pubs.opengroup.org/onlinepubs/9699919799/functions/rmdir.html
+         *
+         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
+         */
+        FileSystem.prototype.rmdirSync = function (path) {
+            if (this.isReadonly)
+                throw createIOError("EROFS");
+            path = this._resolve(path);
+            var _a = this._walk(path, /*noFollow*/ true), parent = _a.parent, links = _a.links, node = _a.node, basename = _a.basename;
+            if (!parent)
+                throw createIOError("EPERM");
+            if (!isDirectory(node))
+                throw createIOError("ENOTDIR");
+            if (this._getLinks(node).size !== 0)
+                throw createIOError("ENOTEMPTY");
+            this._removeLink(parent, links, basename, node);
+        };
+        /**
+         * Link one file to another file (also known as a "hard link").
+         *
+         * @link http://pubs.opengroup.org/onlinepubs/9699919799/functions/link.html
+         *
+         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
+         */
+        FileSystem.prototype.linkSync = function (oldpath, newpath) {
+            if (this.isReadonly)
+                throw createIOError("EROFS");
+            var node = this._walk(this._resolve(oldpath)).node;
+            if (!node)
+                throw createIOError("ENOENT");
+            if (isDirectory(node))
+                throw createIOError("EPERM");
+            var _a = this._walk(this._resolve(newpath), /*noFollow*/ true), parent = _a.parent, links = _a.links, basename = _a.basename, existingNode = _a.node;
+            if (!parent)
+                throw createIOError("EPERM");
+            if (existingNode)
+                throw createIOError("EEXIST");
+            this._addLink(parent, links, basename, node);
+        };
+        /**
+         * Remove a directory entry.
+         *
+         * @link http://pubs.opengroup.org/onlinepubs/9699919799/functions/unlink.html
+         *
+         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
+         */
+        FileSystem.prototype.unlinkSync = function (path) {
+            if (this.isReadonly)
+                throw createIOError("EROFS");
+            var _a = this._walk(this._resolve(path), /*noFollow*/ true), parent = _a.parent, links = _a.links, node = _a.node, basename = _a.basename;
+            if (!parent)
+                throw createIOError("EPERM");
+            if (!node)
+                throw createIOError("ENOENT");
+            if (isDirectory(node))
+                throw createIOError("EISDIR");
+            this._removeLink(parent, links, basename, node);
+        };
+        /**
+         * Rename a file.
+         *
+         * @link http://pubs.opengroup.org/onlinepubs/9699919799/functions/rename.html
+         *
+         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
+         */
+        FileSystem.prototype.renameSync = function (oldpath, newpath) {
+            if (this.isReadonly)
+                throw createIOError("EROFS");
+            var _a = this._walk(this._resolve(oldpath), /*noFollow*/ true), oldParent = _a.parent, oldParentLinks = _a.links, node = _a.node, oldBasename = _a.basename;
+            if (!oldParent)
+                throw createIOError("EPERM");
+            if (!node)
+                throw createIOError("ENOENT");
+            var _b = this._walk(this._resolve(newpath), /*noFollow*/ true), newParent = _b.parent, newParentLinks = _b.links, existingNode = _b.node, newBasename = _b.basename;
+            if (!newParent)
+                throw createIOError("EPERM");
+            var time = this.time();
+            if (existingNode) {
+                if (isDirectory(node)) {
+                    if (!isDirectory(existingNode))
+                        throw createIOError("ENOTDIR");
+                    if (this._getLinks(existingNode).size > 0)
+                        throw createIOError("ENOTEMPTY");
+                }
+                else {
+                    if (isDirectory(existingNode))
+                        throw createIOError("EISDIR");
+                }
+                this._removeLink(newParent, newParentLinks, newBasename, existingNode, time);
+            }
+            this._replaceLink(oldParent, oldParentLinks, oldBasename, newParent, newParentLinks, newBasename, node, time);
+        };
+        /**
+         * Make a symbolic link.
+         *
+         * @link http://pubs.opengroup.org/onlinepubs/9699919799/functions/symlink.html
+         *
+         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
+         */
+        FileSystem.prototype.symlinkSync = function (target, linkpath) {
+            if (this.isReadonly)
+                throw createIOError("EROFS");
+            var _a = this._walk(this._resolve(linkpath), /*noFollow*/ true), parent = _a.parent, links = _a.links, existingNode = _a.node, basename = _a.basename;
+            if (!parent)
+                throw createIOError("EPERM");
+            if (existingNode)
+                throw createIOError("EEXIST");
+            var time = this.time();
+            var node = this._mknod(parent.dev, S_IFLNK, /*mode*/ 438, time);
+            node.symlink = vpath.validate(target, 2016 /* RelativeOrAbsolute */);
+            this._addLink(parent, links, basename, node, time);
+        };
+        /**
+         * Resolve a pathname.
+         *
+         * @link http://pubs.opengroup.org/onlinepubs/9699919799/functions/realpath.html
+         *
+         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
+         */
+        FileSystem.prototype.realpathSync = function (path) {
+            var realpath = this._walk(this._resolve(path)).realpath;
+            return realpath;
+        };
+        FileSystem.prototype.readFileSync = function (path, encoding) {
+            if (encoding === void 0) { encoding = null; }
+            var node = this._walk(this._resolve(path)).node;
+            if (!node)
+                throw createIOError("ENOENT");
+            if (isDirectory(node))
+                throw createIOError("EISDIR");
+            if (!isFile(node))
+                throw createIOError("EBADF");
+            var buffer = this._getBuffer(node).slice();
+            return encoding ? buffer.toString(encoding) : buffer;
+        };
+        /**
+         * Write to a file.
+         *
+         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
+         */
+        FileSystem.prototype.writeFileSync = function (path, data, encoding) {
+            if (encoding === void 0) { encoding = null; }
+            if (this.isReadonly)
+                throw createIOError("EROFS");
+            var _a = this._walk(this._resolve(path), /*noFollow*/ false), parent = _a.parent, links = _a.links, existingNode = _a.node, basename = _a.basename;
+            if (!parent)
+                throw createIOError("EPERM");
+            var time = this.time();
+            var node = existingNode;
+            if (!node) {
+                node = this._mknod(parent.dev, S_IFREG, 438, time);
+                this._addLink(parent, links, basename, node, time);
+            }
+            if (isDirectory(node))
+                throw createIOError("EISDIR");
+            if (!isFile(node))
+                throw createIOError("EBADF");
+            node.buffer = Buffer.isBuffer(data) ? data.slice() : Buffer.from("" + data, encoding || "utf8");
+            node.size = node.buffer.byteLength;
+            node.mtimeMs = time;
+            node.ctimeMs = time;
+        };
+        FileSystem.prototype._mknod = function (dev, type, mode, time) {
+            if (time === void 0) { time = this.time(); }
+            return {
+                dev: dev,
+                ino: ++inoCount,
+                mode: (mode & ~S_IFMT & ~18 & 4095) | (type & S_IFMT),
+                atimeMs: time,
+                mtimeMs: time,
+                ctimeMs: time,
+                birthtimeMs: time,
+                nlink: 0
+            };
+        };
+        FileSystem.prototype._addLink = function (parent, links, name, node, time) {
+            if (time === void 0) { time = this.time(); }
+            links.set(name, node);
+            node.nlink++;
+            node.ctimeMs = time;
+            if (parent)
+                parent.mtimeMs = time;
+            if (!parent && !this._cwd)
+                this._cwd = name;
+        };
+        FileSystem.prototype._removeLink = function (parent, links, name, node, time) {
+            if (time === void 0) { time = this.time(); }
+            links.delete(name);
+            node.nlink--;
+            node.ctimeMs = time;
+            if (parent)
+                parent.mtimeMs = time;
+        };
+        FileSystem.prototype._replaceLink = function (oldParent, oldLinks, oldName, newParent, newLinks, newName, node, time) {
+            if (oldParent !== newParent) {
+                this._removeLink(oldParent, oldLinks, oldName, node, time);
+                this._addLink(newParent, newLinks, newName, node, time);
+            }
+            else {
+                oldLinks.delete(oldName);
+                oldLinks.set(newName, node);
+                oldParent.mtimeMs = time;
+                newParent.mtimeMs = time;
+            }
+        };
+        FileSystem.prototype._getRootLinks = function () {
+            if (!this._lazy.links) {
+                this._lazy.links = new collections.SortedMap(this.stringComparer);
+                if (this._shadowRoot) {
+                    this._copyShadowLinks(this._shadowRoot._getRootLinks(), this._lazy.links);
+                }
+                this._lazy.links = this._lazy.links;
+            }
+            return this._lazy.links;
+        };
+        FileSystem.prototype._getLinks = function (node) {
+            if (!node.links) {
+                var links = new collections.SortedMap(this.stringComparer);
+                var source = node.source, resolver = node.resolver;
+                if (source && resolver) {
+                    node.source = undefined;
+                    node.resolver = undefined;
+                    for (var _i = 0, _a = resolver.readdirSync(source); _i < _a.length; _i++) {
+                        var name = _a[_i];
+                        var path = vpath.combine(source, name);
+                        var stats = resolver.statSync(path);
+                        switch (stats.mode & S_IFMT) {
+                            case S_IFDIR:
+                                var dir = this._mknod(node.dev, S_IFDIR, 511);
+                                dir.source = vpath.combine(source, name);
+                                dir.resolver = resolver;
+                                this._addLink(node, links, name, dir);
+                                break;
+                            case S_IFREG:
+                                var file = this._mknod(node.dev, S_IFREG, 438);
+                                file.source = vpath.combine(source, name);
+                                file.resolver = resolver;
+                                file.size = stats.size;
+                                this._addLink(node, links, name, file);
+                                break;
+                        }
+                    }
+                }
+                else if (this._shadowRoot && node.shadowRoot) {
+                    this._copyShadowLinks(this._shadowRoot._getLinks(node.shadowRoot), links);
+                }
+                node.links = links;
+            }
+            return node.links;
+        };
+        FileSystem.prototype._getShadow = function (root) {
+            var shadows = this._lazy.shadows || (this._lazy.shadows = new Map());
+            var shadow = shadows.get(root.ino);
+            if (!shadow) {
+                shadow = {
+                    dev: root.dev,
+                    ino: root.ino,
+                    mode: root.mode,
+                    atimeMs: root.atimeMs,
+                    mtimeMs: root.mtimeMs,
+                    ctimeMs: root.ctimeMs,
+                    birthtimeMs: root.birthtimeMs,
+                    nlink: root.nlink,
+                    shadowRoot: root
+                };
+                if (isSymlink(root))
+                    shadow.symlink = root.symlink;
+                shadows.set(shadow.ino, shadow);
+            }
+            return shadow;
+        };
+        FileSystem.prototype._copyShadowLinks = function (source, target) {
+            var iterator = collections.getIterator(source);
+            try {
+                for (var i = collections.nextResult(iterator); i; i = collections.nextResult(iterator)) {
+                    var _a = i.value, name = _a[0], root = _a[1];
+                    target.set(name, this._getShadow(root));
+                }
+            }
+            finally {
+                collections.closeIterator(iterator);
+            }
+        };
+        FileSystem.prototype._getSize = function (node) {
+            if (node.buffer)
+                return node.buffer.byteLength;
+            if (node.size !== undefined)
+                return node.size;
+            if (node.source && node.resolver)
+                return node.size = node.resolver.statSync(node.source).size;
+            if (this._shadowRoot && node.shadowRoot)
+                return node.size = this._shadowRoot._getSize(node.shadowRoot);
+            return 0;
+        };
+        FileSystem.prototype._getBuffer = function (node) {
+            if (!node.buffer) {
+                var source = node.source, resolver = node.resolver;
+                if (source && resolver) {
+                    node.source = undefined;
+                    node.resolver = undefined;
+                    node.size = undefined;
+                    node.buffer = resolver.readFileSync(source);
+                }
+                else if (this._shadowRoot && node.shadowRoot) {
+                    node.buffer = this._shadowRoot._getBuffer(node.shadowRoot);
+                }
+                else {
+                    node.buffer = Buffer.allocUnsafe(0);
+                }
+            }
+            return node.buffer;
+        };
+        FileSystem.prototype._walk = function (path, noFollow, onError) {
+            var links = this._getRootLinks();
+            var parent;
+            var components = vpath.parse(path);
+            var step = 0;
+            var depth = 0;
+            var retry = false;
+            while (true) {
+                if (depth >= 40)
+                    throw createIOError("ELOOP");
+                var lastStep = step === components.length - 1;
+                var basename = components[step];
+                var node = links.get(basename);
+                if (lastStep && (noFollow || !isSymlink(node))) {
+                    return { realpath: vpath.format(components), basename: basename, parent: parent, links: links, node: node };
+                }
+                if (node === undefined) {
+                    if (trapError(createIOError("ENOENT"), node))
+                        continue;
+                    return undefined;
+                }
+                if (isSymlink(node)) {
+                    var dirname = vpath.format(components.slice(0, step));
+                    var symlink = vpath.resolve(dirname, node.symlink);
+                    links = this._getRootLinks();
+                    parent = undefined;
+                    components = vpath.parse(symlink).concat(components.slice(step + 1));
+                    step = 0;
+                    depth++;
+                    retry = false;
+                    continue;
+                }
+                if (isDirectory(node)) {
+                    links = this._getLinks(node);
+                    parent = node;
+                    step++;
+                    retry = false;
+                    continue;
+                }
+                if (trapError(createIOError("ENOTDIR"), node))
+                    continue;
+                return undefined;
+            }
+            function trapError(error, node) {
+                var realpath = vpath.format(components.slice(0, step + 1));
+                var basename = components[step];
+                var result = !retry && onError ? onError(error, { realpath: realpath, basename: basename, parent: parent, links: links, node: node }) : "throw";
+                if (result === "stop")
+                    return false;
+                if (result === "retry") {
+                    retry = true;
+                    return true;
+                }
+                throw error;
+            }
+        };
+        /**
+         * Resolve a path relative to the current working directory.
+         */
+        FileSystem.prototype._resolve = function (path) {
+            return this._cwd
+                ? vpath.resolve(this._cwd, vpath.validate(path, 2016 /* RelativeOrAbsolute */ | 2048 /* AllowWildcard */))
+                : vpath.validate(path, 2017 /* Absolute */ | 2048 /* AllowWildcard */);
+        };
+        FileSystem.prototype._applyFiles = function (files, dirname) {
+            var deferred = [];
+            this._applyFilesWorker(files, dirname, deferred);
+            for (var _i = 0, deferred_1 = deferred; _i < deferred_1.length; _i++) {
+                var _a = deferred_1[_i], entry = _a[0], path = _a[1];
+                this.mkdirpSync(vpath.dirname(path));
+                this.pushd(vpath.dirname(path));
+                if (entry instanceof Symlink) {
+                    if (this.stringComparer(vpath.dirname(path), path) === 0) {
+                        throw new TypeError("Roots cannot be symbolic links.");
+                    }
+                    this.symlinkSync(entry.symlink, path);
+                    this._applyFileExtendedOptions(path, entry);
+                }
+                else if (entry instanceof Link) {
+                    if (this.stringComparer(vpath.dirname(path), path) === 0) {
+                        throw new TypeError("Roots cannot be hard links.");
+                    }
+                    this.linkSync(entry.path, path);
+                }
+                else {
+                    this.mountSync(entry.source, path, entry.resolver);
+                    this._applyFileExtendedOptions(path, entry);
+                }
+                this.popd();
+            }
+        };
+        FileSystem.prototype._applyFileExtendedOptions = function (path, entry) {
+            var meta = entry.meta;
+            if (meta !== undefined) {
+                var filemeta = this.filemeta(path);
+                for (var _i = 0, _a = Object.keys(meta); _i < _a.length; _i++) {
+                    var key = _a[_i];
+                    filemeta.set(key, meta[key]);
+                }
+            }
+        };
+        FileSystem.prototype._applyFilesWorker = function (files, dirname, deferred) {
+            for (var _i = 0, _a = Object.keys(files); _i < _a.length; _i++) {
+                var key = _a[_i];
+                var value = this._normalizeFileSetEntry(files[key]);
+                var path = dirname ? vpath.resolve(dirname, key) : key;
+                vpath.validate(path, 2017 /* Absolute */);
+                if (value === null || value === undefined) {
+                    if (this.stringComparer(vpath.dirname(path), path) === 0) {
+                        throw new TypeError("Roots cannot be deleted.");
+                    }
+                    this.rimrafSync(path);
+                }
+                else if (value instanceof File) {
+                    if (this.stringComparer(vpath.dirname(path), path) === 0) {
+                        throw new TypeError("Roots cannot be files.");
+                    }
+                    this.mkdirpSync(vpath.dirname(path));
+                    this.writeFileSync(path, value.data, value.encoding);
+                    this._applyFileExtendedOptions(path, value);
+                }
+                else if (value instanceof Directory) {
+                    this.mkdirpSync(path);
+                    this._applyFileExtendedOptions(path, value);
+                    this._applyFilesWorker(value.files, path, deferred);
+                }
+                else {
+                    deferred.push([value, path]);
+                }
+            }
+        };
+        FileSystem.prototype._normalizeFileSetEntry = function (value) {
+            if (value === undefined ||
+                value === null ||
+                value instanceof Directory ||
+                value instanceof File ||
+                value instanceof Link ||
+                value instanceof Symlink ||
+                value instanceof Mount) {
+                return value;
+            }
+            return typeof value === "string" || Buffer.isBuffer(value) ? new File(value) : new Directory(value);
+        };
+        return FileSystem;
+    }());
+    vfs.FileSystem = FileSystem;
+    function createResolver(host) {
+        return {
+            readdirSync: function (path) {
+                var _a = host.getAccessibleFileSystemEntries(path), files = _a.files, directories = _a.directories;
+                return directories.concat(files);
+            },
+            statSync: function (path) {
+                if (host.directoryExists(path)) {
+                    return { mode: S_IFDIR | 511, size: 0 };
+                }
+                else if (host.fileExists(path)) {
+                    return { mode: S_IFREG | 438, size: host.getFileSize(path) };
+                }
+                else {
+                    throw new Error("ENOENT: path does not exist");
+                }
+            },
+            readFileSync: function (path) {
+                return Buffer.from(host.readFile(path), "utf8"); // TODO: GH#18217
+            }
+        };
+    }
+    vfs.createResolver = createResolver;
+    /**
+     * Create a virtual file system from a physical file system using the following path mappings:
+     *
+     *  - `/.ts` is a directory mapped to `${workspaceRoot}/built/local`
+     *  - `/.lib` is a directory mapped to `${workspaceRoot}/tests/lib`
+     *  - `/.src` is a virtual directory to be used for tests.
+     *
+     * Unless overridden, `/.src` will be the current working directory for the virtual file system.
+     */
+    function createFromFileSystem(host, ignoreCase, _a) {
+        var _b = _a === void 0 ? {} : _a, documents = _b.documents, cwd = _b.cwd;
+        var fs = getBuiltLocal(host, ignoreCase).shadow();
+        if (cwd) {
+            fs.mkdirpSync(cwd);
+            fs.chdir(cwd);
+        }
+        if (documents) {
+            for (var _i = 0, documents_1 = documents; _i < documents_1.length; _i++) {
+                var document = documents_1[_i];
+                fs.mkdirpSync(vpath.dirname(document.file));
+                fs.writeFileSync(document.file, document.text, "utf8");
+                fs.filemeta(document.file).set("document", document);
+                // Add symlinks
+                var symlink = document.meta.get("symlink");
+                if (symlink) {
+                    for (var _c = 0, _d = symlink.split(",").map(function (link) { return link.trim(); }); _c < _d.length; _c++) {
+                        var link = _d[_c];
+                        fs.mkdirpSync(vpath.dirname(link));
+                        fs.symlinkSync(document.file, link);
+                        fs.filemeta(link).set("document", document);
+                    }
+                }
+            }
+        }
+        return fs;
+    }
+    vfs.createFromFileSystem = createFromFileSystem;
+    var Stats = /** @class */ (function () {
+        function Stats(dev, ino, mode, nlink, rdev, size, blksize, blocks, atimeMs, mtimeMs, ctimeMs, birthtimeMs) {
+            if (dev === void 0) { dev = 0; }
+            if (ino === void 0) { ino = 0; }
+            if (mode === void 0) { mode = 0; }
+            if (nlink === void 0) { nlink = 0; }
+            if (rdev === void 0) { rdev = 0; }
+            if (size === void 0) { size = 0; }
+            if (blksize === void 0) { blksize = 0; }
+            if (blocks === void 0) { blocks = 0; }
+            if (atimeMs === void 0) { atimeMs = 0; }
+            if (mtimeMs === void 0) { mtimeMs = 0; }
+            if (ctimeMs === void 0) { ctimeMs = 0; }
+            if (birthtimeMs === void 0) { birthtimeMs = 0; }
+            this.dev = dev;
+            this.ino = ino;
+            this.mode = mode;
+            this.nlink = nlink;
+            this.uid = 0;
+            this.gid = 0;
+            this.rdev = rdev;
+            this.size = size;
+            this.blksize = blksize;
+            this.blocks = blocks;
+            this.atimeMs = atimeMs;
+            this.mtimeMs = mtimeMs;
+            this.ctimeMs = ctimeMs;
+            this.birthtimeMs = birthtimeMs;
+            this.atime = new Date(this.atimeMs);
+            this.mtime = new Date(this.mtimeMs);
+            this.ctime = new Date(this.ctimeMs);
+            this.birthtime = new Date(this.birthtimeMs);
+        }
+        Stats.prototype.isFile = function () { return (this.mode & S_IFMT) === S_IFREG; };
+        Stats.prototype.isDirectory = function () { return (this.mode & S_IFMT) === S_IFDIR; };
+        Stats.prototype.isSymbolicLink = function () { return (this.mode & S_IFMT) === S_IFLNK; };
+        Stats.prototype.isBlockDevice = function () { return (this.mode & S_IFMT) === S_IFBLK; };
+        Stats.prototype.isCharacterDevice = function () { return (this.mode & S_IFMT) === S_IFCHR; };
+        Stats.prototype.isFIFO = function () { return (this.mode & S_IFMT) === S_IFIFO; };
+        Stats.prototype.isSocket = function () { return (this.mode & S_IFMT) === S_IFSOCK; };
+        return Stats;
+    }());
+    vfs.Stats = Stats;
+    // tslint:disable-next-line:variable-name
+    vfs.IOErrorMessages = Object.freeze({
+        EACCES: "access denied",
+        EIO: "an I/O error occurred",
+        ENOENT: "no such file or directory",
+        EEXIST: "file already exists",
+        ELOOP: "too many symbolic links encountered",
+        ENOTDIR: "no such directory",
+        EISDIR: "path is a directory",
+        EBADF: "invalid file descriptor",
+        EINVAL: "invalid value",
+        ENOTEMPTY: "directory not empty",
+        EPERM: "operation not permitted",
+        EROFS: "file system is read-only"
+    });
+    function createIOError(code, details) {
+        if (details === void 0) { details = ""; }
+        var err = new Error(code + ": " + vfs.IOErrorMessages[code] + " " + details);
+        err.code = code;
+        if (Error.captureStackTrace)
+            Error.captureStackTrace(err, createIOError);
+        return err;
+    }
+    vfs.createIOError = createIOError;
+    /** Extended options for a directory in a `FileSet` */
+    var Directory = /** @class */ (function () {
+        function Directory(files, _a) {
+            var meta = (_a === void 0 ? {} : _a).meta;
+            this.files = files;
+            this.meta = meta;
+        }
+        return Directory;
+    }());
+    vfs.Directory = Directory;
+    /** Extended options for a file in a `FileSet` */
+    var File = /** @class */ (function () {
+        function File(data, _a) {
+            var _b = _a === void 0 ? {} : _a, meta = _b.meta, encoding = _b.encoding;
+            this.data = data;
+            this.encoding = encoding;
+            this.meta = meta;
+        }
+        return File;
+    }());
+    vfs.File = File;
+    /** Extended options for a hard link in a `FileSet` */
+    var Link = /** @class */ (function () {
+        function Link(path) {
+            this.path = path;
+        }
+        return Link;
+    }());
+    vfs.Link = Link;
+    /** Extended options for a symbolic link in a `FileSet` */
+    var Symlink = /** @class */ (function () {
+        function Symlink(symlink, _a) {
+            var meta = (_a === void 0 ? {} : _a).meta;
+            this.symlink = symlink;
+            this.meta = meta;
+        }
+        return Symlink;
+    }());
+    vfs.Symlink = Symlink;
+    /** Extended options for mounting a virtual copy of an external file system via a `FileSet` */
+    var Mount = /** @class */ (function () {
+        function Mount(source, resolver, _a) {
+            var meta = (_a === void 0 ? {} : _a).meta;
+            this.source = source;
+            this.resolver = resolver;
+            this.meta = meta;
+        }
+        return Mount;
+    }());
+    vfs.Mount = Mount;
+    function isFile(node) {
+        return node !== undefined && (node.mode & S_IFMT) === S_IFREG;
+    }
+    function isDirectory(node) {
+        return node !== undefined && (node.mode & S_IFMT) === S_IFDIR;
+    }
+    function isSymlink(node) {
+        return node !== undefined && (node.mode & S_IFMT) === S_IFLNK;
+    }
+    var builtLocalHost;
+    var builtLocalCI;
+    var builtLocalCS;
+    function getBuiltLocal(host, ignoreCase) {
+        var _a;
+        if (builtLocalHost !== host) {
+            builtLocalCI = undefined;
+            builtLocalCS = undefined;
+            builtLocalHost = host;
+        }
+        if (!builtLocalCI) {
+            var resolver = createResolver(host);
+            builtLocalCI = new FileSystem(/*ignoreCase*/ true, {
+                files: (_a = {},
+                    _a[vfs.builtFolder] = new Mount(vpath.resolve(host.getWorkspaceRoot(), "built/local"), resolver),
+                    _a[vfs.testLibFolder] = new Mount(vpath.resolve(host.getWorkspaceRoot(), "tests/lib"), resolver),
+                    _a[vfs.projectsFolder] = new Mount(vpath.resolve(host.getWorkspaceRoot(), "tests/projects"), resolver),
+                    _a[vfs.srcFolder] = {},
+                    _a),
+                cwd: vfs.srcFolder,
+                meta: { defaultLibLocation: vfs.builtFolder }
+            });
+            builtLocalCI.makeReadonly();
+        }
+        if (ignoreCase)
+            return builtLocalCI;
+        if (!builtLocalCS) {
+            builtLocalCS = builtLocalCI.shadow(/*ignoreCase*/ false);
+            builtLocalCS.makeReadonly();
+        }
+        return builtLocalCS;
+    }
+})(vfs || (vfs = {}));
+// tslint:enable:no-null-keyword
+/**
+ * Test harness compiler functionality.
+ */
+var compiler;
+(function (compiler) {
+    function readProject(host, project, existingOptions) {
+        if (project) {
+            project = vpath.isTsConfigFile(project) ? project : vpath.combine(project, "tsconfig.json");
+        }
+        else {
+            project = host.vfs.scanSync(".", "ancestors-or-self", {
+                accept: function (path, stats) { return stats.isFile() && host.vfs.stringComparer(vpath.basename(path), "tsconfig.json") === 0; }
+            })[0];
+        }
+        if (project) {
+            // TODO(rbuckton): Do we need to resolve this? Resolving breaks projects tests.
+            // project = vpath.resolve(host.vfs.currentDirectory, project);
+            // read the config file
+            var readResult = ts.readConfigFile(project, function (path) { return host.readFile(path); });
+            if (readResult.error) {
+                return { file: project, errors: [readResult.error] };
+            }
+            // parse the config file
+            var config = ts.parseJsonConfigFileContent(readResult.config, host, vpath.dirname(project), existingOptions);
+            return { file: project, errors: config.errors, config: config };
+        }
+    }
+    compiler.readProject = readProject;
+    var CompilationResult = /** @class */ (function () {
+        function CompilationResult(host, options, program, result, diagnostics) {
+            this._inputs = [];
+            this.host = host;
+            this.program = program;
+            this.result = result;
+            this.diagnostics = diagnostics;
+            this.options = program ? program.getCompilerOptions() : options;
+            // collect outputs
+            var js = this.js = new collections.SortedMap({ comparer: this.vfs.stringComparer, sort: "insertion" });
+            var dts = this.dts = new collections.SortedMap({ comparer: this.vfs.stringComparer, sort: "insertion" });
+            var maps = this.maps = new collections.SortedMap({ comparer: this.vfs.stringComparer, sort: "insertion" });
+            for (var _i = 0, _a = this.host.outputs; _i < _a.length; _i++) {
+                var document = _a[_i];
+                if (vpath.isJavaScript(document.file) || ts.fileExtensionIs(document.file, ".json" /* Json */)) {
+                    js.set(document.file, document);
+                }
+                else if (vpath.isDeclaration(document.file)) {
+                    dts.set(document.file, document);
+                }
+                else if (vpath.isSourceMap(document.file)) {
+                    maps.set(document.file, document);
+                }
+            }
+            // correlate inputs and outputs
+            this._inputsAndOutputs = new collections.SortedMap({ comparer: this.vfs.stringComparer, sort: "insertion" });
+            if (program) {
+                if (this.options.out || this.options.outFile) {
+                    var outFile = vpath.resolve(this.vfs.cwd(), this.options.outFile || this.options.out);
+                    var inputs = [];
+                    for (var _b = 0, _c = program.getSourceFiles(); _b < _c.length; _b++) {
+                        var sourceFile = _c[_b];
+                        if (sourceFile) {
+                            var input = new documents.TextDocument(sourceFile.fileName, sourceFile.text);
+                            this._inputs.push(input);
+                            if (!vpath.isDeclaration(sourceFile.fileName)) {
+                                inputs.push(input);
+                            }
+                        }
+                    }
+                    var outputs = {
+                        inputs: inputs,
+                        js: js.get(outFile),
+                        dts: dts.get(vpath.changeExtension(outFile, ".d.ts")),
+                        map: maps.get(outFile + ".map")
+                    };
+                    if (outputs.js)
+                        this._inputsAndOutputs.set(outputs.js.file, outputs);
+                    if (outputs.dts)
+                        this._inputsAndOutputs.set(outputs.dts.file, outputs);
+                    if (outputs.map)
+                        this._inputsAndOutputs.set(outputs.map.file, outputs);
+                    for (var _d = 0, inputs_1 = inputs; _d < inputs_1.length; _d++) {
+                        var input = inputs_1[_d];
+                        this._inputsAndOutputs.set(input.file, outputs);
+                    }
+                }
+                else {
+                    for (var _e = 0, _f = program.getSourceFiles(); _e < _f.length; _e++) {
+                        var sourceFile = _f[_e];
+                        if (sourceFile) {
+                            var input = new documents.TextDocument(sourceFile.fileName, sourceFile.text);
+                            this._inputs.push(input);
+                            if (!vpath.isDeclaration(sourceFile.fileName)) {
+                                var extname = ts.getOutputExtension(sourceFile, this.options);
+                                var outputs = {
+                                    inputs: [input],
+                                    js: js.get(this.getOutputPath(sourceFile.fileName, extname)),
+                                    dts: dts.get(this.getOutputPath(sourceFile.fileName, ".d.ts")),
+                                    map: maps.get(this.getOutputPath(sourceFile.fileName, extname + ".map"))
+                                };
+                                this._inputsAndOutputs.set(sourceFile.fileName, outputs);
+                                if (outputs.js)
+                                    this._inputsAndOutputs.set(outputs.js.file, outputs);
+                                if (outputs.dts)
+                                    this._inputsAndOutputs.set(outputs.dts.file, outputs);
+                                if (outputs.map)
+                                    this._inputsAndOutputs.set(outputs.map.file, outputs);
+                            }
+                        }
+                    }
+                }
+            }
+            this.diagnostics = diagnostics;
+        }
+        Object.defineProperty(CompilationResult.prototype, "vfs", {
+            get: function () {
+                return this.host.vfs;
+            },
+            enumerable: true,
+            configurable: true
+        });
+        Object.defineProperty(CompilationResult.prototype, "inputs", {
+            get: function () {
+                return this._inputs;
+            },
+            enumerable: true,
+            configurable: true
+        });
+        Object.defineProperty(CompilationResult.prototype, "outputs", {
+            get: function () {
+                return this.host.outputs;
+            },
+            enumerable: true,
+            configurable: true
+        });
+        Object.defineProperty(CompilationResult.prototype, "traces", {
+            get: function () {
+                return this.host.traces;
+            },
+            enumerable: true,
+            configurable: true
+        });
+        Object.defineProperty(CompilationResult.prototype, "emitSkipped", {
+            get: function () {
+                return this.result && this.result.emitSkipped || false;
+            },
+            enumerable: true,
+            configurable: true
+        });
+        Object.defineProperty(CompilationResult.prototype, "singleFile", {
+            get: function () {
+                return !!this.options.outFile || !!this.options.out;
+            },
+            enumerable: true,
+            configurable: true
+        });
+        Object.defineProperty(CompilationResult.prototype, "commonSourceDirectory", {
+            get: function () {
+                var common = this.program && this.program.getCommonSourceDirectory() || "";
+                return common && vpath.combine(this.vfs.cwd(), common);
+            },
+            enumerable: true,
+            configurable: true
+        });
+        CompilationResult.prototype.getInputsAndOutputs = function (path) {
+            return this._inputsAndOutputs.get(vpath.resolve(this.vfs.cwd(), path));
+        };
+        CompilationResult.prototype.getInputs = function (path) {
+            var outputs = this.getInputsAndOutputs(path);
+            return outputs && outputs.inputs;
+        };
+        CompilationResult.prototype.getOutput = function (path, kind) {
+            var outputs = this.getInputsAndOutputs(path);
+            return outputs && outputs[kind];
+        };
+        CompilationResult.prototype.getSourceMapRecord = function () {
+            if (this.result.sourceMaps && this.result.sourceMaps.length > 0) {
+                return Harness.SourceMapRecorder.getSourceMapRecord(this.result.sourceMaps, this.program, Array.from(this.js.values()).filter(function (d) { return !ts.fileExtensionIs(d.file, ".json" /* Json */); }), Array.from(this.dts.values()));
+            }
+        };
+        CompilationResult.prototype.getSourceMap = function (path) {
+            if (this.options.noEmit || vpath.isDeclaration(path))
+                return undefined;
+            if (this.options.inlineSourceMap) {
+                var document = this.getOutput(path, "js");
+                return document && documents.SourceMap.fromSource(document.text);
+            }
+            if (this.options.sourceMap) {
+                var document = this.getOutput(path, "map");
+                return document && new documents.SourceMap(document.file, document.text);
+            }
+        };
+        CompilationResult.prototype.getOutputPath = function (path, ext) {
+            if (this.options.outFile || this.options.out) {
+                path = vpath.resolve(this.vfs.cwd(), this.options.outFile || this.options.out);
+            }
+            else {
+                path = vpath.resolve(this.vfs.cwd(), path);
+                var outDir = ext === ".d.ts" ? this.options.declarationDir || this.options.outDir : this.options.outDir;
+                if (outDir) {
+                    var common = this.commonSourceDirectory;
+                    if (common) {
+                        path = vpath.relative(common, path, this.vfs.ignoreCase);
+                        path = vpath.combine(vpath.resolve(this.vfs.cwd(), this.options.outDir), path);
+                    }
+                }
+            }
+            return vpath.changeExtension(path, ext);
+        };
+        CompilationResult.prototype.getNumberOfJsFiles = function () {
+            var count = this.js.size;
+            this.js.forEach(function (document) {
+                if (ts.fileExtensionIs(document.file, ".json" /* Json */)) {
+                    count--;
+                }
+            });
+            return count;
+        };
+        return CompilationResult;
+    }());
+    compiler.CompilationResult = CompilationResult;
+    function compileFiles(host, rootFiles, compilerOptions) {
+        if (compilerOptions.project || !rootFiles || rootFiles.length === 0) {
+            var project = readProject(host.parseConfigHost, compilerOptions.project, compilerOptions);
+            if (project) {
+                if (project.errors && project.errors.length > 0) {
+                    return new CompilationResult(host, compilerOptions, /*program*/ undefined, /*result*/ undefined, project.errors);
+                }
+                if (project.config) {
+                    rootFiles = project.config.fileNames;
+                    compilerOptions = project.config.options;
+                }
+            }
+            delete compilerOptions.project;
+        }
+        // establish defaults (aligns with old harness)
+        if (compilerOptions.target === undefined)
+            compilerOptions.target = 0 /* ES3 */;
+        if (compilerOptions.newLine === undefined)
+            compilerOptions.newLine = 0 /* CarriageReturnLineFeed */;
+        if (compilerOptions.skipDefaultLibCheck === undefined)
+            compilerOptions.skipDefaultLibCheck = true;
+        if (compilerOptions.noErrorTruncation === undefined)
+            compilerOptions.noErrorTruncation = true;
+        var program = ts.createProgram(rootFiles || [], compilerOptions, host);
+        var emitResult = program.emit();
+        var errors = ts.getPreEmitDiagnostics(program);
+        return new CompilationResult(host, compilerOptions, program, emitResult, errors);
+    }
+    compiler.compileFiles = compileFiles;
+})(compiler || (compiler = {}));
+var evaluator;
+(function (evaluator) {
+    var sourceFile = vpath.combine(vfs.srcFolder, "source.ts");
+    function compile(sourceText, options) {
+        var fs = vfs.createFromFileSystem(Harness.IO, /*ignoreCase*/ false);
+        fs.writeFileSync(sourceFile, sourceText);
+        var compilerOptions = __assign({ target: 1 /* ES5 */, module: ts.ModuleKind.CommonJS, lib: ["lib.esnext.d.ts", "lib.dom.d.ts"] }, options);
+        var host = new fakes.CompilerHost(fs, compilerOptions);
+        return compiler.compileFiles(host, [sourceFile], compilerOptions);
+    }
+    function noRequire(id) {
+        throw new Error("Module '" + id + "' could not be found.");
+    }
+    // Define a custom "Symbol" constructor to attach missing built-in symbols without
+    // modifying the global "Symbol" constructor
+    // tslint:disable-next-line:variable-name
+    var FakeSymbol = (function (description) { return Symbol(description); });
+    FakeSymbol.prototype = Symbol.prototype;
+    for (var _i = 0, _a = Object.getOwnPropertyNames(Symbol); _i < _a.length; _i++) {
+        var key = _a[_i];
+        Object.defineProperty(FakeSymbol, key, Object.getOwnPropertyDescriptor(Symbol, key));
+    }
+    // Add "asyncIterator" if missing
+    if (!ts.hasProperty(FakeSymbol, "asyncIterator"))
+        Object.defineProperty(FakeSymbol, "asyncIterator", { value: Symbol.for("Symbol.asyncIterator"), configurable: true });
+    function evaluate(result, globals) {
+        globals = __assign({ Symbol: FakeSymbol }, globals);
+        if (ts.some(result.diagnostics)) {
+            assert.ok(/*value*/ false, "Syntax error in evaluation source text:\n" + ts.formatDiagnostics(result.diagnostics, {
+                getCanonicalFileName: function (file) { return file; },
+                getCurrentDirectory: function () { return ""; },
+                getNewLine: function () { return "\n"; }
+            }));
+        }
+        var output = result.getOutput(sourceFile, "js");
+        assert.isDefined(output);
+        var globalNames = [];
+        var globalArgs = [];
+        for (var name in globals) {
+            if (ts.hasProperty(globals, name)) {
+                globalNames.push(name);
+                globalArgs.push(globals[name]);
+            }
+        }
+        var evaluateText = "(function (module, exports, require, __dirname, __filename, " + globalNames.join(", ") + ") { " + output.text + " })";
+        var evaluateThunk = eval(evaluateText);
+        var module = { exports: {} };
+        evaluateThunk.call.apply(evaluateThunk, [globals, module, module.exports, noRequire, vpath.dirname(output.file), output.file, FakeSymbol].concat(globalArgs));
+        return module.exports;
+    }
+    function evaluateTypeScript(sourceText, options, globals) {
+        return evaluate(compile(sourceText, options), globals);
+    }
+    evaluator.evaluateTypeScript = evaluateTypeScript;
+})(evaluator || (evaluator = {}));
+/**
+ * Fake implementations of various compiler dependencies.
+ */
+var fakes;
+(function (fakes) {
+    var processExitSentinel = new Error("System exit");
+    /**
+     * A fake `ts.System` that leverages a virtual file system.
+     */
+    var System = /** @class */ (function () {
+        function System(vfs, _a) {
+            var _b = _a === void 0 ? {} : _a, executingFilePath = _b.executingFilePath, _c = _b.newLine, newLine = _c === void 0 ? "\r\n" : _c, env = _b.env;
+            this.args = [];
+            this.output = [];
+            this.vfs = vfs.isReadonly ? vfs.shadow() : vfs;
+            this.useCaseSensitiveFileNames = !this.vfs.ignoreCase;
+            this.newLine = newLine;
+            this._executingFilePath = executingFilePath;
+            this._env = env;
+        }
+        System.prototype.write = function (message) {
+            this.output.push(message);
+        };
+        System.prototype.readFile = function (path) {
+            try {
+                var content = this.vfs.readFileSync(path, "utf8");
+                return content === undefined ? undefined : utils.removeByteOrderMark(content);
+            }
+            catch (_a) {
+                return undefined;
+            }
+        };
+        System.prototype.writeFile = function (path, data, writeByteOrderMark) {
+            this.vfs.mkdirpSync(vpath.dirname(path));
+            this.vfs.writeFileSync(path, writeByteOrderMark ? utils.addUTF8ByteOrderMark(data) : data);
+        };
+        System.prototype.deleteFile = function (path) {
+            this.vfs.unlinkSync(path);
+        };
+        System.prototype.fileExists = function (path) {
+            var stats = this._getStats(path);
+            return stats ? stats.isFile() : false;
+        };
+        System.prototype.directoryExists = function (path) {
+            var stats = this._getStats(path);
+            return stats ? stats.isDirectory() : false;
+        };
+        System.prototype.createDirectory = function (path) {
+            this.vfs.mkdirpSync(path);
+        };
+        System.prototype.getCurrentDirectory = function () {
+            return this.vfs.cwd();
+        };
+        System.prototype.getDirectories = function (path) {
+            var result = [];
+            try {
+                for (var _i = 0, _a = this.vfs.readdirSync(path); _i < _a.length; _i++) {
+                    var file = _a[_i];
+                    if (this.vfs.statSync(vpath.combine(path, file)).isDirectory()) {
+                        result.push(file);
+                    }
+                }
+            }
+            catch ( /*ignore*/_b) { /*ignore*/ }
+            return result;
+        };
+        System.prototype.readDirectory = function (path, extensions, exclude, include, depth) {
+            var _this = this;
+            return ts.matchFiles(path, extensions, exclude, include, this.useCaseSensitiveFileNames, this.getCurrentDirectory(), depth, function (path) { return _this.getAccessibleFileSystemEntries(path); });
+        };
+        System.prototype.getAccessibleFileSystemEntries = function (path) {
+            var files = [];
+            var directories = [];
+            try {
+                for (var _i = 0, _a = this.vfs.readdirSync(path); _i < _a.length; _i++) {
+                    var file = _a[_i];
+                    try {
+                        var stats = this.vfs.statSync(vpath.combine(path, file));
+                        if (stats.isFile()) {
+                            files.push(file);
+                        }
+                        else if (stats.isDirectory()) {
+                            directories.push(file);
+                        }
+                    }
+                    catch ( /*ignored*/_b) { /*ignored*/ }
+                }
+            }
+            catch ( /*ignored*/_c) { /*ignored*/ }
+            return { files: files, directories: directories };
+        };
+        System.prototype.exit = function (exitCode) {
+            this.exitCode = exitCode;
+            throw processExitSentinel;
+        };
+        System.prototype.getFileSize = function (path) {
+            var stats = this._getStats(path);
+            return stats && stats.isFile() ? stats.size : 0;
+        };
+        System.prototype.resolvePath = function (path) {
+            return vpath.resolve(this.vfs.cwd(), path);
+        };
+        System.prototype.getExecutingFilePath = function () {
+            if (this._executingFilePath === undefined)
+                return ts.notImplemented();
+            return this._executingFilePath;
+        };
+        System.prototype.getModifiedTime = function (path) {
+            var stats = this._getStats(path);
+            return stats ? stats.mtime : undefined; // TODO: GH#18217
+        };
+        System.prototype.setModifiedTime = function (path, time) {
+            this.vfs.utimesSync(path, time, time);
+        };
+        System.prototype.createHash = function (data) {
+            return data;
+        };
+        System.prototype.realpath = function (path) {
+            try {
+                return this.vfs.realpathSync(path);
+            }
+            catch (_a) {
+                return path;
+            }
+        };
+        System.prototype.getEnvironmentVariable = function (name) {
+            return (this._env && this._env[name]); // TODO: GH#18217
+        };
+        System.prototype._getStats = function (path) {
+            try {
+                return this.vfs.existsSync(path) ? this.vfs.statSync(path) : undefined;
+            }
+            catch (_a) {
+                return undefined;
+            }
+        };
+        return System;
+    }());
+    fakes.System = System;
+    /**
+     * A fake `ts.ParseConfigHost` that leverages a virtual file system.
+     */
+    var ParseConfigHost = /** @class */ (function () {
+        function ParseConfigHost(sys) {
+            if (sys instanceof vfs.FileSystem)
+                sys = new System(sys);
+            this.sys = sys;
+        }
+        Object.defineProperty(ParseConfigHost.prototype, "vfs", {
+            get: function () {
+                return this.sys.vfs;
+            },
+            enumerable: true,
+            configurable: true
+        });
+        Object.defineProperty(ParseConfigHost.prototype, "useCaseSensitiveFileNames", {
+            get: function () {
+                return this.sys.useCaseSensitiveFileNames;
+            },
+            enumerable: true,
+            configurable: true
+        });
+        ParseConfigHost.prototype.fileExists = function (fileName) {
+            return this.sys.fileExists(fileName);
+        };
+        ParseConfigHost.prototype.directoryExists = function (directoryName) {
+            return this.sys.directoryExists(directoryName);
+        };
+        ParseConfigHost.prototype.readFile = function (path) {
+            return this.sys.readFile(path);
+        };
+        ParseConfigHost.prototype.readDirectory = function (path, extensions, excludes, includes, depth) {
+            return this.sys.readDirectory(path, extensions, excludes, includes, depth);
+        };
+        return ParseConfigHost;
+    }());
+    fakes.ParseConfigHost = ParseConfigHost;
+    /**
+     * A fake `ts.CompilerHost` that leverages a virtual file system.
+     */
+    var CompilerHost = /** @class */ (function () {
+        function CompilerHost(sys, options, setParentNodes) {
+            if (options === void 0) { options = ts.getDefaultCompilerOptions(); }
+            if (setParentNodes === void 0) { setParentNodes = false; }
+            var _this = this;
+            this.outputs = [];
+            this.traces = [];
+            this.shouldAssertInvariants = !Harness.lightMode;
+            if (sys instanceof vfs.FileSystem)
+                sys = new System(sys);
+            this.sys = sys;
+            this.defaultLibLocation = sys.vfs.meta.get("defaultLibLocation") || "";
+            this._newLine = ts.getNewLineCharacter(options, function () { return _this.sys.newLine; });
+            this._sourceFiles = new collections.SortedMap({ comparer: sys.vfs.stringComparer, sort: "insertion" });
+            this._setParentNodes = setParentNodes;
+            this._outputsMap = new collections.SortedMap(this.vfs.stringComparer);
+        }
+        Object.defineProperty(CompilerHost.prototype, "vfs", {
+            get: function () {
+                return this.sys.vfs;
+            },
+            enumerable: true,
+            configurable: true
+        });
+        Object.defineProperty(CompilerHost.prototype, "parseConfigHost", {
+            get: function () {
+                return this._parseConfigHost || (this._parseConfigHost = new ParseConfigHost(this.sys));
+            },
+            enumerable: true,
+            configurable: true
+        });
+        CompilerHost.prototype.getCurrentDirectory = function () {
+            return this.sys.getCurrentDirectory();
+        };
+        CompilerHost.prototype.useCaseSensitiveFileNames = function () {
+            return this.sys.useCaseSensitiveFileNames;
+        };
+        CompilerHost.prototype.getNewLine = function () {
+            return this._newLine;
+        };
+        CompilerHost.prototype.getCanonicalFileName = function (fileName) {
+            return this.sys.useCaseSensitiveFileNames ? fileName : fileName.toLowerCase();
+        };
+        CompilerHost.prototype.deleteFile = function (fileName) {
+            this.sys.deleteFile(fileName);
+        };
+        CompilerHost.prototype.fileExists = function (fileName) {
+            return this.sys.fileExists(fileName);
+        };
+        CompilerHost.prototype.directoryExists = function (directoryName) {
+            return this.sys.directoryExists(directoryName);
+        };
+        CompilerHost.prototype.getModifiedTime = function (fileName) {
+            return this.sys.getModifiedTime(fileName);
+        };
+        CompilerHost.prototype.setModifiedTime = function (fileName, time) {
+            return this.sys.setModifiedTime(fileName, time);
+        };
+        CompilerHost.prototype.getDirectories = function (path) {
+            return this.sys.getDirectories(path);
+        };
+        CompilerHost.prototype.readDirectory = function (path, extensions, exclude, include, depth) {
+            return this.sys.readDirectory(path, extensions, exclude, include, depth);
+        };
+        CompilerHost.prototype.readFile = function (path) {
+            return this.sys.readFile(path);
+        };
+        CompilerHost.prototype.writeFile = function (fileName, content, writeByteOrderMark) {
+            if (writeByteOrderMark)
+                content = utils.addUTF8ByteOrderMark(content);
+            this.sys.writeFile(fileName, content);
+            var document = new documents.TextDocument(fileName, content);
+            document.meta.set("fileName", fileName);
+            this.vfs.filemeta(fileName).set("document", document);
+            if (!this._outputsMap.has(document.file)) {
+                this._outputsMap.set(document.file, this.outputs.length);
+                this.outputs.push(document);
+            }
+            this.outputs[this._outputsMap.get(document.file)] = document;
+        };
+        CompilerHost.prototype.trace = function (s) {
+            this.traces.push(s);
+        };
+        CompilerHost.prototype.realpath = function (path) {
+            return this.sys.realpath(path);
+        };
+        CompilerHost.prototype.getDefaultLibLocation = function () {
+            return vpath.resolve(this.getCurrentDirectory(), this.defaultLibLocation);
+        };
+        CompilerHost.prototype.getDefaultLibFileName = function (options) {
+            return vpath.resolve(this.getDefaultLibLocation(), ts.getDefaultLibFileName(options));
+        };
+        CompilerHost.prototype.getSourceFile = function (fileName, languageVersion) {
+            var canonicalFileName = this.getCanonicalFileName(vpath.resolve(this.getCurrentDirectory(), fileName));
+            var existing = this._sourceFiles.get(canonicalFileName);
+            if (existing)
+                return existing;
+            var content = this.readFile(canonicalFileName);
+            if (content === undefined)
+                return undefined;
+            // A virtual file system may shadow another existing virtual file system. This
+            // allows us to reuse a common virtual file system structure across multiple
+            // tests. If a virtual file is a shadow, it is likely that the file will be
+            // reused across multiple tests. In that case, we cache the SourceFile we parse
+            // so that it can be reused across multiple tests to avoid the cost of
+            // repeatedly parsing the same file over and over (such as lib.d.ts).
+            var cacheKey = this.vfs.shadowRoot && "SourceFile[languageVersion=" + languageVersion + ",setParentNodes=" + this._setParentNodes + "]";
+            if (cacheKey) {
+                var meta = this.vfs.filemeta(canonicalFileName);
+                var sourceFileFromMetadata = meta.get(cacheKey);
+                if (sourceFileFromMetadata && sourceFileFromMetadata.getFullText() === content) {
+                    this._sourceFiles.set(canonicalFileName, sourceFileFromMetadata);
+                    return sourceFileFromMetadata;
+                }
+            }
+            var parsed = ts.createSourceFile(fileName, content, languageVersion, this._setParentNodes || this.shouldAssertInvariants);
+            if (this.shouldAssertInvariants) {
+                Utils.assertInvariants(parsed, /*parent*/ undefined);
+            }
+            this._sourceFiles.set(canonicalFileName, parsed);
+            if (cacheKey) {
+                // store the cached source file on the unshadowed file with the same version.
+                var stats = this.vfs.statSync(canonicalFileName);
+                var fs = this.vfs;
+                while (fs.shadowRoot) {
+                    try {
+                        var shadowRootStats = fs.shadowRoot.existsSync(canonicalFileName) ? fs.shadowRoot.statSync(canonicalFileName) : undefined; // TODO: GH#18217
+                        if (shadowRootStats.dev !== stats.dev ||
+                            shadowRootStats.ino !== stats.ino ||
+                            shadowRootStats.mtimeMs !== stats.mtimeMs) {
+                            break;
+                        }
+                        fs = fs.shadowRoot;
+                    }
+                    catch (_a) {
+                        break;
+                    }
+                }
+                if (fs !== this.vfs) {
+                    fs.filemeta(canonicalFileName).set(cacheKey, parsed);
+                }
+            }
+            return parsed;
+        };
+        return CompilerHost;
+    }());
+    fakes.CompilerHost = CompilerHost;
+})(fakes || (fakes = {}));
+var ts;
+(function (ts) {
+    var server;
+    (function (server) {
+        /* @internal */
+        function extractMessage(message) {
+            // Read the content length
+            var contentLengthPrefix = "Content-Length: ";
+            var lines = message.split(/\r?\n/);
+            ts.Debug.assert(lines.length >= 2, "Malformed response: Expected 3 lines in the response.");
+            var contentLengthText = lines[0];
+            ts.Debug.assert(contentLengthText.indexOf(contentLengthPrefix) === 0, "Malformed response: Response text did not contain content-length header.");
+            var contentLength = parseInt(contentLengthText.substring(contentLengthPrefix.length));
+            // Read the body
+            var responseBody = lines[2];
+            // Verify content length
+            ts.Debug.assert(responseBody.length + 1 === contentLength, "Malformed response: Content length did not match the response's body length.");
+            return responseBody;
+        }
+        server.extractMessage = extractMessage;
+        var SessionClient = /** @class */ (function () {
+            function SessionClient(host) {
+                this.host = host;
+                this.sequence = 0;
+                this.lineMaps = ts.createMap();
+                this.messages = [];
+                this.getCombinedCodeFix = ts.notImplemented;
+                this.applyCodeActionCommand = ts.notImplemented;
+            }
+            SessionClient.prototype.onMessage = function (message) {
+                this.messages.push(message);
+            };
+            SessionClient.prototype.writeMessage = function (message) {
+                this.host.writeMessage(message);
+            };
+            SessionClient.prototype.getLineMap = function (fileName) {
+                var lineMap = this.lineMaps.get(fileName);
+                if (!lineMap) {
+                    lineMap = ts.computeLineStarts(ts.getSnapshotText(this.host.getScriptSnapshot(fileName)));
+                    this.lineMaps.set(fileName, lineMap);
+                }
+                return lineMap;
+            };
+            SessionClient.prototype.lineOffsetToPosition = function (fileName, lineOffset, lineMap) {
+                lineMap = lineMap || this.getLineMap(fileName);
+                return ts.computePositionOfLineAndCharacter(lineMap, lineOffset.line - 1, lineOffset.offset - 1);
+            };
+            SessionClient.prototype.positionToOneBasedLineOffset = function (fileName, position) {
+                var lineOffset = ts.computeLineAndCharacterOfPosition(this.getLineMap(fileName), position);
+                return {
+                    line: lineOffset.line + 1,
+                    offset: lineOffset.character + 1
+                };
+            };
+            SessionClient.prototype.convertCodeEditsToTextChange = function (fileName, codeEdit) {
+                return { span: this.decodeSpan(codeEdit, fileName), newText: codeEdit.newText };
+            };
+            SessionClient.prototype.processRequest = function (command, args) {
+                var request = {
+                    seq: this.sequence,
+                    type: "request",
+                    arguments: args,
+                    command: command
+                };
+                this.sequence++;
+                this.writeMessage(JSON.stringify(request));
+                return request;
+            };
+            SessionClient.prototype.processResponse = function (request) {
+                var foundResponseMessage = false;
+                var response;
+                while (!foundResponseMessage) {
+                    var lastMessage = this.messages.shift();
+                    ts.Debug.assert(!!lastMessage, "Did not receive any responses.");
+                    var responseBody = extractMessage(lastMessage);
+                    try {
+                        response = JSON.parse(responseBody);
+                        // the server may emit events before emitting the response. We
+                        // want to ignore these events for testing purpose.
+                        if (response.type === "response") {
+                            foundResponseMessage = true;
+                        }
+                    }
+                    catch (e) {
+                        throw new Error("Malformed response: Failed to parse server response: " + lastMessage + ". \r\n  Error details: " + e.message);
+                    }
+                }
+                // verify the sequence numbers
+                ts.Debug.assert(response.request_seq === request.seq, "Malformed response: response sequence number did not match request sequence number.");
+                // unmarshal errors
+                if (!response.success) {
+                    throw new Error("Error " + response.message);
+                }
+                ts.Debug.assert(!!response.body, "Malformed response: Unexpected empty response body.");
+                return response;
+            };
+            SessionClient.prototype.openFile = function (file, fileContent, scriptKindName) {
+                var args = { file: file, fileContent: fileContent, scriptKindName: scriptKindName };
+                this.processRequest(server.CommandNames.Open, args);
+            };
+            SessionClient.prototype.closeFile = function (file) {
+                var args = { file: file };
+                this.processRequest(server.CommandNames.Close, args);
+            };
+            SessionClient.prototype.changeFile = function (fileName, start, end, insertString) {
+                // clear the line map after an edit
+                this.lineMaps.set(fileName, undefined); // TODO: GH#18217
+                var args = __assign({}, this.createFileLocationRequestArgsWithEndLineAndOffset(fileName, start, end), { insertString: insertString });
+                this.processRequest(server.CommandNames.Change, args);
+            };
+            SessionClient.prototype.toLineColumnOffset = function (fileName, position) {
+                var _a = this.positionToOneBasedLineOffset(fileName, position), line = _a.line, offset = _a.offset;
+                return { line: line, character: offset };
+            };
+            SessionClient.prototype.getQuickInfoAtPosition = function (fileName, position) {
+                var args = this.createFileLocationRequestArgs(fileName, position);
+                var request = this.processRequest(server.CommandNames.Quickinfo, args);
+                var response = this.processResponse(request);
+                var body = response.body; // TODO: GH#18217
+                return {
+                    kind: body.kind,
+                    kindModifiers: body.kindModifiers,
+                    textSpan: this.decodeSpan(body, fileName),
+                    displayParts: [{ kind: "text", text: body.displayString }],
+                    documentation: [{ kind: "text", text: body.documentation }],
+                    tags: body.tags
+                };
+            };
+            SessionClient.prototype.getProjectInfo = function (file, needFileNameList) {
+                var args = { file: file, needFileNameList: needFileNameList };
+                var request = this.processRequest(server.CommandNames.ProjectInfo, args);
+                var response = this.processResponse(request);
+                return {
+                    configFileName: response.body.configFileName,
+                    fileNames: response.body.fileNames
+                };
+            };
+            SessionClient.prototype.getCompletionsAtPosition = function (fileName, position, _preferences) {
+                var _this = this;
+                // Not passing along 'preferences' because server should already have those from the 'configure' command
+                var args = this.createFileLocationRequestArgs(fileName, position);
+                var request = this.processRequest(server.CommandNames.Completions, args);
+                var response = this.processResponse(request);
+                return {
+                    isGlobalCompletion: false,
+                    isMemberCompletion: false,
+                    isNewIdentifierLocation: false,
+                    entries: response.body.map(function (entry) {
+                        if (entry.replacementSpan !== undefined) {
+                            var name = entry.name, kind = entry.kind, kindModifiers = entry.kindModifiers, sortText = entry.sortText, replacementSpan = entry.replacementSpan, hasAction = entry.hasAction, source = entry.source, isRecommended = entry.isRecommended;
+                            // TODO: GH#241
+                            var res = { name: name, kind: kind, kindModifiers: kindModifiers, sortText: sortText, replacementSpan: _this.decodeSpan(replacementSpan, fileName), hasAction: hasAction, source: source, isRecommended: isRecommended };
+                            return res;
+                        }
+                        return entry; // TODO: GH#18217
+                    })
+                };
+            };
+            SessionClient.prototype.getCompletionEntryDetails = function (fileName, position, entryName, _options, source) {
+                var _this = this;
+                var args = __assign({}, this.createFileLocationRequestArgs(fileName, position), { entryNames: [{ name: entryName, source: source }] });
+                var request = this.processRequest(server.CommandNames.CompletionDetails, args);
+                var response = this.processResponse(request);
+                ts.Debug.assert(response.body.length === 1, "Unexpected length of completion details response body.");
+                var convertedCodeActions = ts.map(response.body[0].codeActions, function (_a) {
+                    var description = _a.description, changes = _a.changes;
+                    return ({ description: description, changes: _this.convertChanges(changes, fileName) });
+                });
+                return __assign({}, response.body[0], { codeActions: convertedCodeActions });
+            };
+            SessionClient.prototype.getCompletionEntrySymbol = function (_fileName, _position, _entryName) {
+                return ts.notImplemented();
+            };
+            SessionClient.prototype.getNavigateToItems = function (searchValue) {
+                var _this = this;
+                var args = {
+                    searchValue: searchValue,
+                    file: this.host.getScriptFileNames()[0]
+                };
+                var request = this.processRequest(server.CommandNames.Navto, args);
+                var response = this.processResponse(request);
+                return response.body.map(function (entry) { return ({
+                    name: entry.name,
+                    containerName: entry.containerName || "",
+                    containerKind: entry.containerKind || "" /* unknown */,
+                    kind: entry.kind,
+                    kindModifiers: entry.kindModifiers,
+                    matchKind: entry.matchKind,
+                    isCaseSensitive: entry.isCaseSensitive,
+                    fileName: entry.file,
+                    textSpan: _this.decodeSpan(entry),
+                }); });
+            };
+            SessionClient.prototype.getFormattingEditsForRange = function (file, start, end, _options) {
+                var _this = this;
+                var args = this.createFileLocationRequestArgsWithEndLineAndOffset(file, start, end);
+                // TODO: handle FormatCodeOptions
+                var request = this.processRequest(server.CommandNames.Format, args);
+                var response = this.processResponse(request);
+                return response.body.map(function (entry) { return _this.convertCodeEditsToTextChange(file, entry); }); // TODO: GH#18217
+            };
+            SessionClient.prototype.getFormattingEditsForDocument = function (fileName, options) {
+                return this.getFormattingEditsForRange(fileName, 0, this.host.getScriptSnapshot(fileName).getLength(), options);
+            };
+            SessionClient.prototype.getFormattingEditsAfterKeystroke = function (fileName, position, key, _options) {
+                var _this = this;
+                var args = __assign({}, this.createFileLocationRequestArgs(fileName, position), { key: key });
+                // TODO: handle FormatCodeOptions
+                var request = this.processRequest(server.CommandNames.Formatonkey, args);
+                var response = this.processResponse(request);
+                return response.body.map(function (entry) { return _this.convertCodeEditsToTextChange(fileName, entry); }); // TODO: GH#18217
+            };
+            SessionClient.prototype.getDefinitionAtPosition = function (fileName, position) {
+                var _this = this;
+                var args = this.createFileLocationRequestArgs(fileName, position);
+                var request = this.processRequest(server.CommandNames.Definition, args);
+                var response = this.processResponse(request);
+                return response.body.map(function (entry) { return ({
+                    containerKind: "" /* unknown */,
+                    containerName: "",
+                    fileName: entry.file,
+                    textSpan: _this.decodeSpan(entry),
+                    kind: "" /* unknown */,
+                    name: ""
+                }); });
+            };
+            SessionClient.prototype.getDefinitionAndBoundSpan = function (fileName, position) {
+                var _this = this;
+                var args = this.createFileLocationRequestArgs(fileName, position);
+                var request = this.processRequest(server.CommandNames.DefinitionAndBoundSpan, args);
+                var response = this.processResponse(request);
+                return {
+                    definitions: response.body.definitions.map(function (entry) { return ({
+                        containerKind: "" /* unknown */,
+                        containerName: "",
+                        fileName: entry.file,
+                        textSpan: _this.decodeSpan(entry),
+                        kind: "" /* unknown */,
+                        name: ""
+                    }); }),
+                    textSpan: this.decodeSpan(response.body.textSpan, request.arguments.file)
+                };
+            };
+            SessionClient.prototype.getTypeDefinitionAtPosition = function (fileName, position) {
+                var _this = this;
+                var args = this.createFileLocationRequestArgs(fileName, position);
+                var request = this.processRequest(server.CommandNames.TypeDefinition, args);
+                var response = this.processResponse(request);
+                return response.body.map(function (entry) { return ({
+                    containerKind: "" /* unknown */,
+                    containerName: "",
+                    fileName: entry.file,
+                    textSpan: _this.decodeSpan(entry),
+                    kind: "" /* unknown */,
+                    name: ""
+                }); });
+            };
+            SessionClient.prototype.getImplementationAtPosition = function (fileName, position) {
+                var _this = this;
+                var args = this.createFileLocationRequestArgs(fileName, position);
+                var request = this.processRequest(server.CommandNames.Implementation, args);
+                var response = this.processResponse(request);
+                return response.body.map(function (entry) { return ({
+                    fileName: entry.file,
+                    textSpan: _this.decodeSpan(entry),
+                    kind: "" /* unknown */,
+                    displayParts: []
+                }); });
+            };
+            SessionClient.prototype.findReferences = function (_fileName, _position) {
+                // Not yet implemented.
+                return [];
+            };
+            SessionClient.prototype.getReferencesAtPosition = function (fileName, position) {
+                var _this = this;
+                var args = this.createFileLocationRequestArgs(fileName, position);
+                var request = this.processRequest(server.CommandNames.References, args);
+                var response = this.processResponse(request);
+                return response.body.refs.map(function (entry) { return ({
+                    fileName: entry.file,
+                    textSpan: _this.decodeSpan(entry),
+                    isWriteAccess: entry.isWriteAccess,
+                    isDefinition: entry.isDefinition,
+                }); });
+            };
+            SessionClient.prototype.getEmitOutput = function (_fileName) {
+                return ts.notImplemented();
+            };
+            SessionClient.prototype.getSyntacticDiagnostics = function (file) {
+                return this.getDiagnostics(file, server.CommandNames.SyntacticDiagnosticsSync);
+            };
+            SessionClient.prototype.getSemanticDiagnostics = function (file) {
+                return this.getDiagnostics(file, server.CommandNames.SemanticDiagnosticsSync);
+            };
+            SessionClient.prototype.getSuggestionDiagnostics = function (file) {
+                return this.getDiagnostics(file, server.CommandNames.SuggestionDiagnosticsSync);
+            };
+            SessionClient.prototype.getDiagnostics = function (file, command) {
+                var request = this.processRequest(command, { file: file, includeLinePosition: true });
+                var response = this.processResponse(request);
+                return response.body.map(function (entry) {
+                    var category = ts.firstDefined(Object.keys(ts.DiagnosticCategory), function (id) {
+                        return ts.isString(id) && entry.category === id.toLowerCase() ? ts.DiagnosticCategory[id] : undefined;
+                    });
+                    return {
+                        file: undefined,
+                        start: entry.start,
+                        length: entry.length,
+                        messageText: entry.message,
+                        category: ts.Debug.assertDefined(category, "convertDiagnostic: category should not be undefined"),
+                        code: entry.code,
+                        reportsUnnecessary: entry.reportsUnnecessary,
+                    };
+                });
+            };
+            SessionClient.prototype.getCompilerOptionsDiagnostics = function () {
+                return ts.notImplemented();
+            };
+            SessionClient.prototype.getRenameInfo = function (fileName, position, findInStrings, findInComments) {
+                var args = __assign({}, this.createFileLocationRequestArgs(fileName, position), { findInStrings: findInStrings, findInComments: findInComments });
+                var request = this.processRequest(server.CommandNames.Rename, args);
+                var response = this.processResponse(request);
+                var body = response.body; // TODO: GH#18217
+                var locations = [];
+                for (var _i = 0, _a = body.locs; _i < _a.length; _i++) {
+                    var entry = _a[_i];
+                    var fileName_1 = entry.file;
+                    for (var _b = 0, _c = entry.locs; _b < _c.length; _b++) {
+                        var loc = _c[_b];
+                        locations.push({ textSpan: this.decodeSpan(loc, fileName_1), fileName: fileName_1 });
+                    }
+                }
+                return this.lastRenameEntry = {
+                    canRename: body.info.canRename,
+                    displayName: body.info.displayName,
+                    fullDisplayName: body.info.fullDisplayName,
+                    kind: body.info.kind,
+                    kindModifiers: body.info.kindModifiers,
+                    localizedErrorMessage: body.info.localizedErrorMessage,
+                    triggerSpan: ts.createTextSpanFromBounds(position, position),
+                    fileName: fileName,
+                    position: position,
+                    findInStrings: !!findInStrings,
+                    findInComments: !!findInComments,
+                    locations: locations,
+                };
+            };
+            SessionClient.prototype.findRenameLocations = function (fileName, position, findInStrings, findInComments) {
+                if (!this.lastRenameEntry ||
+                    this.lastRenameEntry.fileName !== fileName ||
+                    this.lastRenameEntry.position !== position ||
+                    this.lastRenameEntry.findInStrings !== findInStrings ||
+                    this.lastRenameEntry.findInComments !== findInComments) {
+                    this.getRenameInfo(fileName, position, findInStrings, findInComments);
+                }
+                return this.lastRenameEntry.locations;
+            };
+            SessionClient.prototype.decodeNavigationBarItems = function (items, fileName, lineMap) {
+                var _this = this;
+                if (!items) {
+                    return [];
+                }
+                return items.map(function (item) { return ({
+                    text: item.text,
+                    kind: item.kind,
+                    kindModifiers: item.kindModifiers || "",
+                    spans: item.spans.map(function (span) { return _this.decodeSpan(span, fileName, lineMap); }),
+                    childItems: _this.decodeNavigationBarItems(item.childItems, fileName, lineMap),
+                    indent: item.indent,
+                    bolded: false,
+                    grayed: false
+                }); });
+            };
+            SessionClient.prototype.getNavigationBarItems = function (file) {
+                var request = this.processRequest(server.CommandNames.NavBar, { file: file });
+                var response = this.processResponse(request);
+                var lineMap = this.getLineMap(file);
+                return this.decodeNavigationBarItems(response.body, file, lineMap);
+            };
+            SessionClient.prototype.decodeNavigationTree = function (tree, fileName, lineMap) {
+                var _this = this;
+                return {
+                    text: tree.text,
+                    kind: tree.kind,
+                    kindModifiers: tree.kindModifiers,
+                    spans: tree.spans.map(function (span) { return _this.decodeSpan(span, fileName, lineMap); }),
+                    nameSpan: tree.nameSpan && this.decodeSpan(tree.nameSpan, fileName, lineMap),
+                    childItems: ts.map(tree.childItems, function (item) { return _this.decodeNavigationTree(item, fileName, lineMap); })
+                };
+            };
+            SessionClient.prototype.getNavigationTree = function (file) {
+                var request = this.processRequest(server.CommandNames.NavTree, { file: file });
+                var response = this.processResponse(request);
+                var lineMap = this.getLineMap(file);
+                return this.decodeNavigationTree(response.body, file, lineMap); // TODO: GH#18217
+            };
+            SessionClient.prototype.decodeSpan = function (span, fileName, lineMap) {
+                fileName = fileName || span.file;
+                lineMap = lineMap || this.getLineMap(fileName);
+                return ts.createTextSpanFromBounds(this.lineOffsetToPosition(fileName, span.start, lineMap), this.lineOffsetToPosition(fileName, span.end, lineMap));
+            };
+            SessionClient.prototype.getNameOrDottedNameSpan = function (_fileName, _startPos, _endPos) {
+                return ts.notImplemented();
+            };
+            SessionClient.prototype.getBreakpointStatementAtPosition = function (_fileName, _position) {
+                return ts.notImplemented();
+            };
+            SessionClient.prototype.getSignatureHelpItems = function (fileName, position) {
+                var args = this.createFileLocationRequestArgs(fileName, position);
+                var request = this.processRequest(server.CommandNames.SignatureHelp, args);
+                var response = this.processResponse(request);
+                if (!response.body) {
+                    return undefined; // TODO: GH#18217
+                }
+                var _a = response.body, items = _a.items, encodedApplicableSpan = _a.applicableSpan, selectedItemIndex = _a.selectedItemIndex, argumentIndex = _a.argumentIndex, argumentCount = _a.argumentCount;
+                var applicableSpan = this.decodeSpan(encodedApplicableSpan, fileName);
+                return { items: items, applicableSpan: applicableSpan, selectedItemIndex: selectedItemIndex, argumentIndex: argumentIndex, argumentCount: argumentCount };
+            };
+            SessionClient.prototype.getOccurrencesAtPosition = function (fileName, position) {
+                var _this = this;
+                var args = this.createFileLocationRequestArgs(fileName, position);
+                var request = this.processRequest(server.CommandNames.Occurrences, args);
+                var response = this.processResponse(request);
+                return response.body.map(function (entry) { return ({
+                    fileName: entry.file,
+                    textSpan: _this.decodeSpan(entry),
+                    isWriteAccess: entry.isWriteAccess,
+                    isDefinition: false
+                }); });
+            };
+            SessionClient.prototype.getDocumentHighlights = function (fileName, position, filesToSearch) {
+                var _this = this;
+                var args = __assign({}, this.createFileLocationRequestArgs(fileName, position), { filesToSearch: filesToSearch });
+                var request = this.processRequest(server.CommandNames.DocumentHighlights, args);
+                var response = this.processResponse(request);
+                return response.body.map(function (item) { return ({
+                    fileName: item.file,
+                    highlightSpans: item.highlightSpans.map(function (span) { return ({
+                        textSpan: _this.decodeSpan(span, item.file),
+                        kind: span.kind
+                    }); }),
+                }); });
+            };
+            SessionClient.prototype.getOutliningSpans = function (file) {
+                var _this = this;
+                var request = this.processRequest(server.CommandNames.GetOutliningSpans, { file: file });
+                var response = this.processResponse(request);
+                return response.body.map(function (item) { return ({
+                    textSpan: _this.decodeSpan(item.textSpan, file),
+                    hintSpan: _this.decodeSpan(item.hintSpan, file),
+                    bannerText: item.bannerText,
+                    autoCollapse: item.autoCollapse,
+                    kind: item.kind
+                }); });
+            };
+            SessionClient.prototype.getTodoComments = function (_fileName, _descriptors) {
+                return ts.notImplemented();
+            };
+            SessionClient.prototype.getDocCommentTemplateAtPosition = function (_fileName, _position) {
+                return ts.notImplemented();
+            };
+            SessionClient.prototype.isValidBraceCompletionAtPosition = function (_fileName, _position, _openingBrace) {
+                return ts.notImplemented();
+            };
+            SessionClient.prototype.getJsxClosingTagAtPosition = function (_fileName, _position) {
+                return ts.notImplemented();
+            };
+            SessionClient.prototype.getSpanOfEnclosingComment = function (_fileName, _position, _onlyMultiLine) {
+                return ts.notImplemented();
+            };
+            SessionClient.prototype.getCodeFixesAtPosition = function (file, start, end, errorCodes) {
+                var _this = this;
+                var args = __assign({}, this.createFileRangeRequestArgs(file, start, end), { errorCodes: errorCodes });
+                var request = this.processRequest(server.CommandNames.GetCodeFixes, args);
+                var response = this.processResponse(request);
+                return response.body.map(function (_a) {
+                    var fixName = _a.fixName, description = _a.description, changes = _a.changes, commands = _a.commands, fixId = _a.fixId, fixAllDescription = _a.fixAllDescription;
+                    return ({ fixName: fixName, description: description, changes: _this.convertChanges(changes, file), commands: commands, fixId: fixId, fixAllDescription: fixAllDescription });
+                });
+            };
+            SessionClient.prototype.createFileLocationOrRangeRequestArgs = function (positionOrRange, fileName) {
+                return typeof positionOrRange === "number"
+                    ? this.createFileLocationRequestArgs(fileName, positionOrRange)
+                    : this.createFileRangeRequestArgs(fileName, positionOrRange.pos, positionOrRange.end);
+            };
+            SessionClient.prototype.createFileLocationRequestArgs = function (file, position) {
+                var _a = this.positionToOneBasedLineOffset(file, position), line = _a.line, offset = _a.offset;
+                return { file: file, line: line, offset: offset };
+            };
+            SessionClient.prototype.createFileRangeRequestArgs = function (file, start, end) {
+                var _a = this.positionToOneBasedLineOffset(file, start), startLine = _a.line, startOffset = _a.offset;
+                var _b = this.positionToOneBasedLineOffset(file, end), endLine = _b.line, endOffset = _b.offset;
+                return { file: file, startLine: startLine, startOffset: startOffset, endLine: endLine, endOffset: endOffset };
+            };
+            SessionClient.prototype.createFileLocationRequestArgsWithEndLineAndOffset = function (file, start, end) {
+                var _a = this.positionToOneBasedLineOffset(file, start), line = _a.line, offset = _a.offset;
+                var _b = this.positionToOneBasedLineOffset(file, end), endLine = _b.line, endOffset = _b.offset;
+                return { file: file, line: line, offset: offset, endLine: endLine, endOffset: endOffset };
+            };
+            SessionClient.prototype.getApplicableRefactors = function (fileName, positionOrRange) {
+                var args = this.createFileLocationOrRangeRequestArgs(positionOrRange, fileName);
+                var request = this.processRequest(server.CommandNames.GetApplicableRefactors, args);
+                var response = this.processResponse(request);
+                return response.body; // TODO: GH#18217
+            };
+            SessionClient.prototype.getEditsForRefactor = function (fileName, _formatOptions, positionOrRange, refactorName, actionName) {
+                var args = this.createFileLocationOrRangeRequestArgs(positionOrRange, fileName);
+                args.refactor = refactorName;
+                args.action = actionName;
+                var request = this.processRequest(server.CommandNames.GetEditsForRefactor, args);
+                var response = this.processResponse(request);
+                if (!response.body) {
+                    return { edits: [], renameFilename: undefined, renameLocation: undefined };
+                }
+                var edits = this.convertCodeEditsToTextChanges(response.body.edits);
+                var renameFilename = response.body.renameFilename;
+                var renameLocation;
+                if (renameFilename !== undefined) {
+                    renameLocation = this.lineOffsetToPosition(renameFilename, response.body.renameLocation); // TODO: GH#18217
+                }
+                return {
+                    edits: edits,
+                    renameFilename: renameFilename,
+                    renameLocation: renameLocation
+                };
+            };
+            SessionClient.prototype.organizeImports = function (_scope, _formatOptions) {
+                return ts.notImplemented();
+            };
+            SessionClient.prototype.getEditsForFileRename = function () {
+                return ts.notImplemented();
+            };
+            SessionClient.prototype.convertCodeEditsToTextChanges = function (edits) {
+                var _this = this;
+                return edits.map(function (edit) {
+                    var fileName = edit.fileName;
+                    return {
+                        fileName: fileName,
+                        textChanges: edit.textChanges.map(function (t) { return _this.convertTextChangeToCodeEdit(t, fileName); })
+                    };
+                });
+            };
+            SessionClient.prototype.convertChanges = function (changes, fileName) {
+                var _this = this;
+                return changes.map(function (change) { return ({
+                    fileName: change.fileName,
+                    textChanges: change.textChanges.map(function (textChange) { return _this.convertTextChangeToCodeEdit(textChange, fileName); })
+                }); });
+            };
+            SessionClient.prototype.convertTextChangeToCodeEdit = function (change, fileName) {
+                return {
+                    span: this.decodeSpan(change, fileName),
+                    newText: change.newText ? change.newText : ""
+                };
+            };
+            SessionClient.prototype.getBraceMatchingAtPosition = function (fileName, position) {
+                var _this = this;
+                var args = this.createFileLocationRequestArgs(fileName, position);
+                var request = this.processRequest(server.CommandNames.Brace, args);
+                var response = this.processResponse(request);
+                return response.body.map(function (entry) { return _this.decodeSpan(entry, fileName); }); // TODO: GH#18217
+            };
+            SessionClient.prototype.getIndentationAtPosition = function (_fileName, _position, _options) {
+                return ts.notImplemented();
+            };
+            SessionClient.prototype.getSyntacticClassifications = function (_fileName, _span) {
+                return ts.notImplemented();
+            };
+            SessionClient.prototype.getSemanticClassifications = function (_fileName, _span) {
+                return ts.notImplemented();
+            };
+            SessionClient.prototype.getEncodedSyntacticClassifications = function (_fileName, _span) {
+                return ts.notImplemented();
+            };
+            SessionClient.prototype.getEncodedSemanticClassifications = function (_fileName, _span) {
+                return ts.notImplemented();
+            };
+            SessionClient.prototype.getProgram = function () {
+                throw new Error("SourceFile objects are not serializable through the server protocol.");
+            };
+            SessionClient.prototype.getNonBoundSourceFile = function (_fileName) {
+                throw new Error("SourceFile objects are not serializable through the server protocol.");
+            };
+            SessionClient.prototype.getSourceFile = function (_fileName) {
+                throw new Error("SourceFile objects are not serializable through the server protocol.");
+            };
+            SessionClient.prototype.cleanupSemanticCache = function () {
+                throw new Error("cleanupSemanticCache is not available through the server layer.");
+            };
+            SessionClient.prototype.dispose = function () {
+                throw new Error("dispose is not available through the server layer.");
+            };
+            return SessionClient;
+        }());
+        server.SessionClient = SessionClient;
+    })(server = ts.server || (ts.server = {}));
+})(ts || (ts = {}));
+var RunnerBase = /** @class */ (function () {
+    function RunnerBase() {
+        // contains the tests to run
+        this.tests = [];
+        /** The working directory where tests are found. Needed for batch testing where the input path will differ from the output path inside baselines */
+        this.workingDirectory = "";
+    }
+    /** Add a source file to the runner's list of tests that need to be initialized with initializeTests */
+    RunnerBase.prototype.addTest = function (fileName) {
+        this.tests.push(fileName);
+    };
+    RunnerBase.prototype.enumerateFiles = function (folder, regex, options) {
+        return ts.map(Harness.IO.listFiles(Harness.userSpecifiedRoot + folder, regex, { recursive: (options ? options.recursive : false) }), ts.normalizeSlashes);
+    };
+    /** Replaces instances of full paths with fileNames only */
+    RunnerBase.removeFullPaths = function (path) {
+        // If its a full path (starts with "C:" or "/") replace with just the filename
+        var fixedPath = /^(\w:|\/)/.test(path) ? ts.getBaseFileName(path) : path;
+        // when running in the browser the 'full path' is the host name, shows up in error baselines
+        var localHost = /http:\/localhost:\d+/g;
+        fixedPath = fixedPath.replace(localHost, "");
+        return fixedPath;
+    };
+    return RunnerBase;
+}());
+var Harness;
+(function (Harness) {
+    var SourceMapRecorder;
+    (function (SourceMapRecorder) {
+        var SourceMapDecoder;
+        (function (SourceMapDecoder) {
+            var sourceMapMappings;
+            var sourceMapNames;
+            var decodingIndex;
+            var prevNameIndex;
+            var decodeOfEncodedMapping;
+            var errorDecodeOfEncodedMapping;
+            function initializeSourceMapDecoding(sourceMapData) {
+                sourceMapMappings = sourceMapData.sourceMapMappings;
+                sourceMapNames = sourceMapData.sourceMapNames;
+                decodingIndex = 0;
+                prevNameIndex = 0;
+                decodeOfEncodedMapping = {
+                    emittedLine: 1,
+                    emittedColumn: 1,
+                    sourceLine: 1,
+                    sourceColumn: 1,
+                    sourceIndex: 0,
+                };
+                errorDecodeOfEncodedMapping = undefined;
+            }
+            SourceMapDecoder.initializeSourceMapDecoding = initializeSourceMapDecoding;
+            function isSourceMappingSegmentEnd() {
+                if (decodingIndex === sourceMapMappings.length) {
+                    return true;
+                }
+                if (sourceMapMappings.charAt(decodingIndex) === ",") {
+                    return true;
+                }
+                if (sourceMapMappings.charAt(decodingIndex) === ";") {
+                    return true;
+                }
+                return false;
+            }
+            function decodeNextEncodedSourceMapSpan() {
+                errorDecodeOfEncodedMapping = undefined;
+                function createErrorIfCondition(condition, errormsg) {
+                    if (errorDecodeOfEncodedMapping) {
+                        // there was existing error:
+                        return true;
+                    }
+                    if (condition) {
+                        errorDecodeOfEncodedMapping = errormsg;
+                    }
+                    return condition;
+                }
+                function base64VLQFormatDecode() {
+                    function base64FormatDecode() {
+                        return "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".indexOf(sourceMapMappings.charAt(decodingIndex));
+                    }
+                    var moreDigits = true;
+                    var shiftCount = 0;
+                    var value = 0;
+                    for (; moreDigits; decodingIndex++) {
+                        if (createErrorIfCondition(decodingIndex >= sourceMapMappings.length, "Error in decoding base64VLQFormatDecode, past the mapping string")) {
+                            return undefined; // TODO: GH#18217
+                        }
+                        // 6 digit number
+                        var currentByte = base64FormatDecode();
+                        // If msb is set, we still have more bits to continue
+                        moreDigits = (currentByte & 32) !== 0;
+                        // least significant 5 bits are the next msbs in the final value.
+                        value = value | ((currentByte & 31) << shiftCount);
+                        shiftCount += 5;
+                    }
+                    // Least significant bit if 1 represents negative and rest of the msb is actual absolute value
+                    if ((value & 1) === 0) {
+                        // + number
+                        value = value >> 1;
+                    }
+                    else {
+                        // - number
+                        value = value >> 1;
+                        value = -value;
+                    }
+                    return value;
+                }
+                while (decodingIndex < sourceMapMappings.length) {
+                    if (sourceMapMappings.charAt(decodingIndex) === ";") {
+                        // New line
+                        decodeOfEncodedMapping.emittedLine++;
+                        decodeOfEncodedMapping.emittedColumn = 1;
+                        decodingIndex++;
+                        continue;
+                    }
+                    if (sourceMapMappings.charAt(decodingIndex) === ",") {
+                        // Next entry is on same line - no action needed
+                        decodingIndex++;
+                        continue;
+                    }
+                    // Read the current span
+                    // 1. Column offset from prev read jsColumn
+                    decodeOfEncodedMapping.emittedColumn += base64VLQFormatDecode();
+                    // Incorrect emittedColumn dont support this map
+                    if (createErrorIfCondition(decodeOfEncodedMapping.emittedColumn < 1, "Invalid emittedColumn found")) {
+                        return { error: errorDecodeOfEncodedMapping, sourceMapSpan: decodeOfEncodedMapping };
+                    }
+                    // Dont support reading mappings that dont have information about original source and its line numbers
+                    if (createErrorIfCondition(isSourceMappingSegmentEnd(), "Unsupported Error Format: No entries after emitted column")) {
+                        return { error: errorDecodeOfEncodedMapping, sourceMapSpan: decodeOfEncodedMapping };
+                    }
+                    // 2. Relative sourceIndex
+                    decodeOfEncodedMapping.sourceIndex += base64VLQFormatDecode();
+                    // Incorrect sourceIndex dont support this map
+                    if (createErrorIfCondition(decodeOfEncodedMapping.sourceIndex < 0, "Invalid sourceIndex found")) {
+                        return { error: errorDecodeOfEncodedMapping, sourceMapSpan: decodeOfEncodedMapping };
+                    }
+                    // Dont support reading mappings that dont have information about original source span
+                    if (createErrorIfCondition(isSourceMappingSegmentEnd(), "Unsupported Error Format: No entries after sourceIndex")) {
+                        return { error: errorDecodeOfEncodedMapping, sourceMapSpan: decodeOfEncodedMapping };
+                    }
+                    // 3. Relative sourceLine 0 based
+                    decodeOfEncodedMapping.sourceLine += base64VLQFormatDecode();
+                    // Incorrect sourceLine dont support this map
+                    if (createErrorIfCondition(decodeOfEncodedMapping.sourceLine < 1, "Invalid sourceLine found")) {
+                        return { error: errorDecodeOfEncodedMapping, sourceMapSpan: decodeOfEncodedMapping };
+                    }
+                    // Dont support reading mappings that dont have information about original source and its line numbers
+                    if (createErrorIfCondition(isSourceMappingSegmentEnd(), "Unsupported Error Format: No entries after emitted Line")) {
+                        return { error: errorDecodeOfEncodedMapping, sourceMapSpan: decodeOfEncodedMapping };
+                    }
+                    // 4. Relative sourceColumn 0 based
+                    decodeOfEncodedMapping.sourceColumn += base64VLQFormatDecode();
+                    // Incorrect sourceColumn dont support this map
+                    if (createErrorIfCondition(decodeOfEncodedMapping.sourceColumn < 1, "Invalid sourceLine found")) {
+                        return { error: errorDecodeOfEncodedMapping, sourceMapSpan: decodeOfEncodedMapping };
+                    }
+                    // 5. Check if there is name:
+                    if (!isSourceMappingSegmentEnd()) {
+                        prevNameIndex += base64VLQFormatDecode();
+                        decodeOfEncodedMapping.nameIndex = prevNameIndex;
+                        // Incorrect nameIndex dont support this map
+                        if (createErrorIfCondition(decodeOfEncodedMapping.nameIndex < 0 || decodeOfEncodedMapping.nameIndex >= sourceMapNames.length, "Invalid name index for the source map entry")) {
+                            return { error: errorDecodeOfEncodedMapping, sourceMapSpan: decodeOfEncodedMapping };
+                        }
+                    }
+                    // Dont support reading mappings that dont have information about original source and its line numbers
+                    if (createErrorIfCondition(!isSourceMappingSegmentEnd(), "Unsupported Error Format: There are more entries after " + (decodeOfEncodedMapping.nameIndex === -1 ? "sourceColumn" : "nameIndex"))) {
+                        return { error: errorDecodeOfEncodedMapping, sourceMapSpan: decodeOfEncodedMapping };
+                    }
+                    // Populated the entry
+                    return { error: errorDecodeOfEncodedMapping, sourceMapSpan: decodeOfEncodedMapping };
+                }
+                createErrorIfCondition(/*condition*/ true, "No encoded entry found");
+                return undefined; // TODO: GH#18217
+            }
+            SourceMapDecoder.decodeNextEncodedSourceMapSpan = decodeNextEncodedSourceMapSpan;
+            function hasCompletedDecoding() {
+                return decodingIndex === sourceMapMappings.length;
+            }
+            SourceMapDecoder.hasCompletedDecoding = hasCompletedDecoding;
+            function getRemainingDecodeString() {
+                return sourceMapMappings.substr(decodingIndex);
+            }
+            SourceMapDecoder.getRemainingDecodeString = getRemainingDecodeString;
+        })(SourceMapDecoder || (SourceMapDecoder = {}));
+        var SourceMapSpanWriter;
+        (function (SourceMapSpanWriter) {
+            var sourceMapRecorder;
+            var sourceMapSources;
+            var sourceMapNames;
+            var jsFile;
+            var jsLineMap;
+            var tsCode;
+            var tsLineMap;
+            var spansOnSingleLine;
+            var prevWrittenSourcePos;
+            var prevWrittenJsLine;
+            var spanMarkerContinues;
+            function initializeSourceMapSpanWriter(sourceMapRecordWriter, sourceMapData, currentJsFile) {
+                sourceMapRecorder = sourceMapRecordWriter;
+                sourceMapSources = sourceMapData.sourceMapSources;
+                sourceMapNames = sourceMapData.sourceMapNames;
+                jsFile = currentJsFile;
+                jsLineMap = jsFile.lineStarts;
+                spansOnSingleLine = [];
+                prevWrittenSourcePos = 0;
+                prevWrittenJsLine = 0;
+                spanMarkerContinues = false;
+                SourceMapDecoder.initializeSourceMapDecoding(sourceMapData);
+                sourceMapRecorder.WriteLine("===================================================================");
+                sourceMapRecorder.WriteLine("JsFile: " + sourceMapData.sourceMapFile);
+                sourceMapRecorder.WriteLine("mapUrl: " + sourceMapData.jsSourceMappingURL);
+                sourceMapRecorder.WriteLine("sourceRoot: " + sourceMapData.sourceMapSourceRoot);
+                sourceMapRecorder.WriteLine("sources: " + sourceMapData.sourceMapSources);
+                if (sourceMapData.sourceMapSourcesContent) {
+                    sourceMapRecorder.WriteLine("sourcesContent: " + JSON.stringify(sourceMapData.sourceMapSourcesContent));
+                }
+                sourceMapRecorder.WriteLine("===================================================================");
+            }
+            SourceMapSpanWriter.initializeSourceMapSpanWriter = initializeSourceMapSpanWriter;
+            function getSourceMapSpanString(mapEntry, getAbsentNameIndex) {
+                var mapString = "Emitted(" + mapEntry.emittedLine + ", " + mapEntry.emittedColumn + ") Source(" + mapEntry.sourceLine + ", " + mapEntry.sourceColumn + ") + SourceIndex(" + mapEntry.sourceIndex + ")";
+                if (mapEntry.nameIndex >= 0 && mapEntry.nameIndex < sourceMapNames.length) {
+                    mapString += " name (" + sourceMapNames[mapEntry.nameIndex] + ")";
+                }
+                else {
+                    if ((mapEntry.nameIndex && mapEntry.nameIndex !== -1) || getAbsentNameIndex) {
+                        mapString += " nameIndex (" + mapEntry.nameIndex + ")";
+                    }
+                }
+                return mapString;
+            }
+            function recordSourceMapSpan(sourceMapSpan) {
+                // verify the decoded span is same as the new span
+                var decodeResult = SourceMapDecoder.decodeNextEncodedSourceMapSpan();
+                var decodeErrors;
+                if (decodeResult.error
+                    || decodeResult.sourceMapSpan.emittedLine !== sourceMapSpan.emittedLine
+                    || decodeResult.sourceMapSpan.emittedColumn !== sourceMapSpan.emittedColumn
+                    || decodeResult.sourceMapSpan.sourceLine !== sourceMapSpan.sourceLine
+                    || decodeResult.sourceMapSpan.sourceColumn !== sourceMapSpan.sourceColumn
+                    || decodeResult.sourceMapSpan.sourceIndex !== sourceMapSpan.sourceIndex
+                    || decodeResult.sourceMapSpan.nameIndex !== sourceMapSpan.nameIndex) {
+                    if (decodeResult.error) {
+                        decodeErrors = ["!!^^ !!^^ There was decoding error in the sourcemap at this location: " + decodeResult.error];
+                    }
+                    else {
+                        decodeErrors = ["!!^^ !!^^ The decoded span from sourcemap's mapping entry does not match what was encoded for this span:"];
+                    }
+                    decodeErrors.push("!!^^ !!^^ Decoded span from sourcemap's mappings entry: " + getSourceMapSpanString(decodeResult.sourceMapSpan, /*getAbsentNameIndex*/ true) + " Span encoded by the emitter:" + getSourceMapSpanString(sourceMapSpan, /*getAbsentNameIndex*/ true));
+                }
+                if (spansOnSingleLine.length && spansOnSingleLine[0].sourceMapSpan.emittedLine !== sourceMapSpan.emittedLine) {
+                    // On different line from the one that we have been recording till now,
+                    writeRecordedSpans();
+                    spansOnSingleLine = [];
+                }
+                spansOnSingleLine.push({ sourceMapSpan: sourceMapSpan, decodeErrors: decodeErrors });
+            }
+            SourceMapSpanWriter.recordSourceMapSpan = recordSourceMapSpan;
+            function recordNewSourceFileSpan(sourceMapSpan, newSourceFileCode) {
+                assert.isTrue(spansOnSingleLine.length === 0 || spansOnSingleLine[0].sourceMapSpan.emittedLine !== sourceMapSpan.emittedLine, "new file source map span should be on new line. We currently handle only that scenario");
+                recordSourceMapSpan(sourceMapSpan);
+                assert.isTrue(spansOnSingleLine.length === 1);
+                sourceMapRecorder.WriteLine("-------------------------------------------------------------------");
+                sourceMapRecorder.WriteLine("emittedFile:" + jsFile.file);
+                sourceMapRecorder.WriteLine("sourceFile:" + sourceMapSources[spansOnSingleLine[0].sourceMapSpan.sourceIndex]);
+                sourceMapRecorder.WriteLine("-------------------------------------------------------------------");
+                tsLineMap = ts.computeLineStarts(newSourceFileCode);
+                tsCode = newSourceFileCode;
+                prevWrittenSourcePos = 0;
+            }
+            SourceMapSpanWriter.recordNewSourceFileSpan = recordNewSourceFileSpan;
+            function close() {
+                // Write the lines pending on the single line
+                writeRecordedSpans();
+                if (!SourceMapDecoder.hasCompletedDecoding()) {
+                    sourceMapRecorder.WriteLine("!!!! **** There are more source map entries in the sourceMap's mapping than what was encoded");
+                    sourceMapRecorder.WriteLine("!!!! **** Remaining decoded string: " + SourceMapDecoder.getRemainingDecodeString());
+                }
+                // write remaining js lines
+                writeJsFileLines(jsLineMap.length);
+            }
+            SourceMapSpanWriter.close = close;
+            function getTextOfLine(line, lineMap, code) {
+                var startPos = lineMap[line];
+                var endPos = lineMap[line + 1];
+                var text = code.substring(startPos, endPos);
+                return line === 0 ? utils.removeByteOrderMark(text) : text;
+            }
+            function writeJsFileLines(endJsLine) {
+                for (; prevWrittenJsLine < endJsLine; prevWrittenJsLine++) {
+                    sourceMapRecorder.Write(">>>" + getTextOfLine(prevWrittenJsLine, jsLineMap, jsFile.text));
+                }
+            }
+            function writeRecordedSpans() {
+                var markerIds = [];
+                function getMarkerId(markerIndex) {
+                    var markerId = "";
+                    if (spanMarkerContinues) {
+                        assert.isTrue(markerIndex === 0);
+                        markerId = "1->";
+                    }
+                    else {
+                        markerId = "" + (markerIndex + 1);
+                        if (markerId.length < 2) {
+                            markerId = markerId + " ";
+                        }
+                        markerId += ">";
+                    }
+                    return markerId;
+                }
+                var prevEmittedCol;
+                function iterateSpans(fn) {
+                    prevEmittedCol = 1;
+                    for (var i = 0; i < spansOnSingleLine.length; i++) {
+                        fn(spansOnSingleLine[i], i);
+                        prevEmittedCol = spansOnSingleLine[i].sourceMapSpan.emittedColumn;
+                    }
+                }
+                function writeSourceMapIndent(indentLength, indentPrefix) {
+                    sourceMapRecorder.Write(indentPrefix);
+                    for (var i = 1; i < indentLength; i++) {
+                        sourceMapRecorder.Write(" ");
+                    }
+                }
+                function writeSourceMapMarker(currentSpan, index, endColumn, endContinues) {
+                    if (endColumn === void 0) { endColumn = currentSpan.sourceMapSpan.emittedColumn; }
+                    if (endContinues === void 0) { endContinues = false; }
+                    var markerId = getMarkerId(index);
+                    markerIds.push(markerId);
+                    writeSourceMapIndent(prevEmittedCol, markerId);
+                    for (var i = prevEmittedCol; i < endColumn; i++) {
+                        sourceMapRecorder.Write("^");
+                    }
+                    if (endContinues) {
+                        sourceMapRecorder.Write("->");
+                    }
+                    sourceMapRecorder.WriteLine("");
+                    spanMarkerContinues = endContinues;
+                }
+                function writeSourceMapSourceText(currentSpan, index) {
+                    var sourcePos = tsLineMap[currentSpan.sourceMapSpan.sourceLine - 1] + (currentSpan.sourceMapSpan.sourceColumn - 1);
+                    var sourceText = "";
+                    if (prevWrittenSourcePos < sourcePos) {
+                        // Position that goes forward, get text
+                        sourceText = tsCode.substring(prevWrittenSourcePos, sourcePos);
+                    }
+                    if (currentSpan.decodeErrors) {
+                        // If there are decode errors, write
+                        for (var _i = 0, _a = currentSpan.decodeErrors; _i < _a.length; _i++) {
+                            var decodeError = _a[_i];
+                            writeSourceMapIndent(prevEmittedCol, markerIds[index]);
+                            sourceMapRecorder.WriteLine(decodeError);
+                        }
+                    }
+                    var tsCodeLineMap = ts.computeLineStarts(sourceText);
+                    for (var i = 0; i < tsCodeLineMap.length; i++) {
+                        writeSourceMapIndent(prevEmittedCol, i === 0 ? markerIds[index] : "  >");
+                        sourceMapRecorder.Write(getTextOfLine(i, tsCodeLineMap, sourceText));
+                        if (i === tsCodeLineMap.length - 1) {
+                            sourceMapRecorder.WriteLine("");
+                        }
+                    }
+                    prevWrittenSourcePos = sourcePos;
+                }
+                function writeSpanDetails(currentSpan, index) {
+                    sourceMapRecorder.WriteLine(markerIds[index] + getSourceMapSpanString(currentSpan.sourceMapSpan));
+                }
+                if (spansOnSingleLine.length) {
+                    var currentJsLine = spansOnSingleLine[0].sourceMapSpan.emittedLine;
+                    // Write js line
+                    writeJsFileLines(currentJsLine);
+                    // Emit markers
+                    iterateSpans(writeSourceMapMarker);
+                    var jsFileText = getTextOfLine(currentJsLine, jsLineMap, jsFile.text);
+                    if (prevEmittedCol < jsFileText.length) {
+                        // There is remaining text on this line that will be part of next source span so write marker that continues
+                        writeSourceMapMarker(/*currentSpan*/ undefined, spansOnSingleLine.length, /*endColumn*/ jsFileText.length, /*endContinues*/ true); // TODO: GH#18217
+                    }
+                    // Emit Source text
+                    iterateSpans(writeSourceMapSourceText);
+                    // Emit column number etc
+                    iterateSpans(writeSpanDetails);
+                    sourceMapRecorder.WriteLine("---");
+                }
+            }
+        })(SourceMapSpanWriter || (SourceMapSpanWriter = {}));
+        function getSourceMapRecord(sourceMapDataList, program, jsFiles, declarationFiles) {
+            var sourceMapRecorder = new Harness.Compiler.WriterAggregator();
+            for (var i = 0; i < sourceMapDataList.length; i++) {
+                var sourceMapData = sourceMapDataList[i];
+                var prevSourceFile = void 0;
+                var currentFile = void 0;
+                if (ts.endsWith(sourceMapData.sourceMapFile, ".d.ts" /* Dts */)) {
+                    if (sourceMapDataList.length > jsFiles.length) {
+                        currentFile = declarationFiles[Math.floor(i / 2)]; // When both kinds of source map are present, they alternate js/dts
+                    }
+                    else {
+                        currentFile = declarationFiles[i];
+                    }
+                }
+                else {
+                    if (sourceMapDataList.length > jsFiles.length) {
+                        currentFile = jsFiles[Math.floor(i / 2)];
+                    }
+                    else {
+                        currentFile = jsFiles[i];
+                    }
+                }
+                SourceMapSpanWriter.initializeSourceMapSpanWriter(sourceMapRecorder, sourceMapData, currentFile);
+                for (var _i = 0, _a = sourceMapData.sourceMapDecodedMappings; _i < _a.length; _i++) {
+                    var decodedSourceMapping = _a[_i];
+                    var currentSourceFile = program.getSourceFile(sourceMapData.inputSourceFileNames[decodedSourceMapping.sourceIndex]);
+                    if (currentSourceFile !== prevSourceFile) {
+                        SourceMapSpanWriter.recordNewSourceFileSpan(decodedSourceMapping, currentSourceFile.text);
+                        prevSourceFile = currentSourceFile;
+                    }
+                    else {
+                        SourceMapSpanWriter.recordSourceMapSpan(decodedSourceMapping);
+                    }
+                }
+                SourceMapSpanWriter.close(); // If the last spans werent emitted, emit them
+            }
+            sourceMapRecorder.Close();
+            return sourceMapRecorder.lines.join("\r\n");
+        }
+        SourceMapRecorder.getSourceMapRecord = getSourceMapRecord;
+    })(SourceMapRecorder = Harness.SourceMapRecorder || (Harness.SourceMapRecorder = {}));
+})(Harness || (Harness = {}));
+// Block scoped definitions work poorly for global variables, temporarily enable var
+/* tslint:disable:no-var-keyword */
+// this will work in the browser via browserify
+var _chai = require("chai");
+var assert = _chai.assert;
+{
+    // chai's builtin `assert.isFalse` is featureful but slow - we don't use those features,
+    // so we'll just overwrite it as an alterative to migrating a bunch of code off of chai
+    assert.isFalse = function (expr, msg) { if (expr !== false)
+        throw new Error(msg); };
+    var assertDeepImpl_1 = assert.deepEqual;
+    assert.deepEqual = function (a, b, msg) {
+        if (ts.isArray(a) && ts.isArray(b)) {
+            assertDeepImpl_1(arrayExtraKeysObject(a), arrayExtraKeysObject(b), "Array extra keys differ");
+        }
+        assertDeepImpl_1(a, b, msg);
+        function arrayExtraKeysObject(a) {
+            var obj = {};
+            for (var key in a) {
+                if (Number.isNaN(Number(key))) {
+                    obj[key] = a[key];
+                }
+            }
+            return obj;
+        }
+    };
+}
+var global = Function("return this").call(undefined);
+/* tslint:enable:no-var-keyword prefer-const */
+var Utils;
+(function (Utils) {
+    // Setup some globals based on the current environment
+    var ExecutionEnvironment;
+    (function (ExecutionEnvironment) {
+        ExecutionEnvironment[ExecutionEnvironment["Node"] = 0] = "Node";
+        ExecutionEnvironment[ExecutionEnvironment["Browser"] = 1] = "Browser";
+    })(ExecutionEnvironment = Utils.ExecutionEnvironment || (Utils.ExecutionEnvironment = {}));
+    function getExecutionEnvironment() {
+        if (typeof window !== "undefined") {
+            return 1 /* Browser */;
+        }
+        else {
+            return 0 /* Node */;
+        }
+    }
+    Utils.getExecutionEnvironment = getExecutionEnvironment;
+    Utils.currentExecutionEnvironment = getExecutionEnvironment();
+    // Thanks to browserify, Buffer is always available nowadays
+    var Buffer = require("buffer").Buffer;
+    function encodeString(s) {
+        return Buffer.from(s).toString("utf8");
+    }
+    Utils.encodeString = encodeString;
+    function byteLength(s, encoding) {
+        // stub implementation if Buffer is not available (in-browser case)
+        return Buffer.byteLength(s, encoding);
+    }
+    Utils.byteLength = byteLength;
+    function evalFile(fileContents, fileName, nodeContext) {
+        var environment = getExecutionEnvironment();
+        switch (environment) {
+            case 1 /* Browser */:
+                eval(fileContents);
+                break;
+            case 0 /* Node */:
+                var vm = require("vm");
+                if (nodeContext) {
+                    vm.runInNewContext(fileContents, nodeContext, fileName);
+                }
+                else {
+                    vm.runInThisContext(fileContents, fileName);
+                }
+                break;
+            default:
+                throw new Error("Unknown context");
+        }
+    }
+    Utils.evalFile = evalFile;
+    /** Splits the given string on \r\n, or on only \n if that fails, or on only \r if *that* fails. */
+    function splitContentByNewlines(content) {
+        // Split up the input file by line
+        // Note: IE JS engine incorrectly handles consecutive delimiters here when using RegExp split, so
+        // we have to use string-based splitting instead and try to figure out the delimiting chars
+        var lines = content.split("\r\n");
+        if (lines.length === 1) {
+            lines = content.split("\n");
+            if (lines.length === 1) {
+                lines = content.split("\r");
+            }
+        }
+        return lines;
+    }
+    Utils.splitContentByNewlines = splitContentByNewlines;
+    /** Reads a file under /tests */
+    function readTestFile(path) {
+        if (path.indexOf("tests") < 0) {
+            path = "tests/" + path;
+        }
+        var content;
+        try {
+            content = Harness.IO.readFile(Harness.userSpecifiedRoot + path);
+        }
+        catch (err) {
+            return undefined;
+        }
+        return content;
+    }
+    Utils.readTestFile = readTestFile;
+    function memoize(f, memoKey) {
+        var cache = ts.createMap();
+        return (function () {
+            var args = [];
+            for (var _i = 0; _i < arguments.length; _i++) {
+                args[_i] = arguments[_i];
+            }
+            var key = memoKey.apply(void 0, args);
+            if (cache.has(key)) {
+                return cache.get(key);
+            }
+            else {
+                var value = f.apply(this, args);
+                cache.set(key, value);
+                return value;
+            }
+        });
+    }
+    Utils.memoize = memoize;
+    Utils.canonicalizeForHarness = ts.createGetCanonicalFileName(/*caseSensitive*/ false); // This is done so tests work on windows _and_ linux
+    function assertInvariants(node, parent) {
+        if (node) {
+            assert.isFalse(node.pos < 0, "node.pos < 0");
+            assert.isFalse(node.end < 0, "node.end < 0");
+            assert.isFalse(node.end < node.pos, "node.end < node.pos");
+            assert.equal(node.parent, parent, "node.parent !== parent");
+            if (parent) {
+                // Make sure each child is contained within the parent.
+                assert.isFalse(node.pos < parent.pos, "node.pos < parent.pos");
+                assert.isFalse(node.end > parent.end, "node.end > parent.end");
+            }
+            ts.forEachChild(node, function (child) {
+                assertInvariants(child, node);
+            });
+            // Make sure each of the children is in order.
+            var currentPos_1 = 0;
+            ts.forEachChild(node, function (child) {
+                assert.isFalse(child.pos < currentPos_1, "child.pos < currentPos");
+                currentPos_1 = child.end;
+            }, function (array) {
+                assert.isFalse(array.pos < node.pos, "array.pos < node.pos");
+                assert.isFalse(array.end > node.end, "array.end > node.end");
+                assert.isFalse(array.pos < currentPos_1, "array.pos < currentPos");
+                for (var _i = 0, array_1 = array; _i < array_1.length; _i++) {
+                    var item = array_1[_i];
+                    assert.isFalse(item.pos < currentPos_1, "array[i].pos < currentPos");
+                    currentPos_1 = item.end;
+                }
+                currentPos_1 = array.end;
+            });
+            var childNodesAndArrays_1 = [];
+            ts.forEachChild(node, function (child) { childNodesAndArrays_1.push(child); }, function (array) { childNodesAndArrays_1.push(array); });
+            for (var childName in node) {
+                if (childName === "parent" || childName === "nextContainer" || childName === "modifiers" || childName === "externalModuleIndicator" ||
+                    // for now ignore jsdoc comments
+                    childName === "jsDocComment" || childName === "checkJsDirective" || childName === "commonJsModuleIndicator") {
+                    continue;
+                }
+                var child = node[childName];
+                if (isNodeOrArray(child)) {
+                    assert.isFalse(childNodesAndArrays_1.indexOf(child) < 0, "Missing child when forEach'ing over node: " + ts.SyntaxKind[node.kind] + "-" + childName);
+                }
+            }
+        }
+    }
+    Utils.assertInvariants = assertInvariants;
+    function isNodeOrArray(a) {
+        return a !== undefined && typeof a.pos === "number";
+    }
+    function convertDiagnostics(diagnostics) {
+        return diagnostics.map(convertDiagnostic);
+    }
+    Utils.convertDiagnostics = convertDiagnostics;
+    function convertDiagnostic(diagnostic) {
+        return {
+            start: diagnostic.start,
+            length: diagnostic.length,
+            messageText: ts.flattenDiagnosticMessageText(diagnostic.messageText, Harness.IO.newLine()),
+            category: ts.diagnosticCategoryName(diagnostic, /*lowerCase*/ false),
+            code: diagnostic.code
+        };
+    }
+    function sourceFileToJSON(file) {
+        return JSON.stringify(file, function (_, v) { return isNodeOrArray(v) ? serializeNode(v) : v; }, "    ");
+        function getKindName(k) {
+            if (ts.isString(k)) {
+                return k;
+            }
+            // For some markers in SyntaxKind, we should print its original syntax name instead of
+            // the marker name in tests.
+            if (k === ts.SyntaxKind.FirstJSDocNode ||
+                k === ts.SyntaxKind.LastJSDocNode ||
+                k === ts.SyntaxKind.FirstJSDocTagNode ||
+                k === ts.SyntaxKind.LastJSDocTagNode) {
+                for (var kindName in ts.SyntaxKind) {
+                    if (ts.SyntaxKind[kindName] === k) {
+                        return kindName;
+                    }
+                }
+            }
+            return ts.SyntaxKind[k];
+        }
+        function getFlagName(flags, f) {
+            if (f === 0) {
+                return 0;
+            }
+            var result = "";
+            ts.forEach(Object.getOwnPropertyNames(flags), function (v) {
+                if (isFinite(v)) {
+                    v = +v;
+                    if (f === +v) {
+                        result = flags[v];
+                        return true;
+                    }
+                    else if ((f & v) > 0) {
+                        if (result.length) {
+                            result += " | ";
+                        }
+                        result += flags[v];
+                        return false;
+                    }
+                }
+            });
+            return result;
+        }
+        function getNodeFlagName(f) { return getFlagName(ts.NodeFlags, f); }
+        function serializeNode(n) {
+            var o = { kind: getKindName(n.kind) };
+            if (ts.containsParseError(n)) {
+                o.containsParseError = true;
+            }
+            for (var _i = 0, _a = Object.getOwnPropertyNames(n); _i < _a.length; _i++) {
+                var propertyName = _a[_i];
+                switch (propertyName) {
+                    case "parent":
+                    case "symbol":
+                    case "locals":
+                    case "localSymbol":
+                    case "kind":
+                    case "id":
+                    case "nodeCount":
+                    case "symbolCount":
+                    case "identifierCount":
+                    case "scriptSnapshot":
+                        // Blacklist of items we never put in the baseline file.
+                        break;
+                    case "originalKeywordKind":
+                        o[propertyName] = getKindName(n[propertyName]);
+                        break;
+                    case "flags":
+                        // Clear the flags that are produced by aggregating child values. That is ephemeral
+                        // data we don't care about in the dump. We only care what the parser set directly
+                        // on the AST.
+                        var flags = n.flags & ~(65536 /* JavaScriptFile */ | 262144 /* HasAggregatedChildData */);
+                        if (flags) {
+                            o[propertyName] = getNodeFlagName(flags);
+                        }
+                        break;
+                    case "parseDiagnostics":
+                        o[propertyName] = convertDiagnostics(n[propertyName]);
+                        break;
+                    case "nextContainer":
+                        if (n.nextContainer) {
+                            o[propertyName] = { kind: n.nextContainer.kind, pos: n.nextContainer.pos, end: n.nextContainer.end };
+                        }
+                        break;
+                    case "text":
+                        // Include 'text' field for identifiers/literals, but not for source files.
+                        if (n.kind !== 274 /* SourceFile */) {
+                            o[propertyName] = n[propertyName];
+                        }
+                        break;
+                    default:
+                        o[propertyName] = n[propertyName];
+                }
+            }
+            return o;
+        }
+    }
+    Utils.sourceFileToJSON = sourceFileToJSON;
+    function assertDiagnosticsEquals(array1, array2) {
+        if (array1 === array2) {
+            return;
+        }
+        assert(array1, "array1");
+        assert(array2, "array2");
+        assert.equal(array1.length, array2.length, "array1.length !== array2.length");
+        for (var i = 0; i < array1.length; i++) {
+            var d1 = array1[i];
+            var d2 = array2[i];
+            assert.equal(d1.start, d2.start, "d1.start !== d2.start");
+            assert.equal(d1.length, d2.length, "d1.length !== d2.length");
+            assert.equal(ts.flattenDiagnosticMessageText(d1.messageText, Harness.IO.newLine()), ts.flattenDiagnosticMessageText(d2.messageText, Harness.IO.newLine()), "d1.messageText !== d2.messageText");
+            assert.equal(d1.category, d2.category, "d1.category !== d2.category");
+            assert.equal(d1.code, d2.code, "d1.code !== d2.code");
+        }
+    }
+    Utils.assertDiagnosticsEquals = assertDiagnosticsEquals;
+    function assertStructuralEquals(node1, node2) {
+        if (node1 === node2) {
+            return;
+        }
+        assert(node1, "node1");
+        assert(node2, "node2");
+        assert.equal(node1.pos, node2.pos, "node1.pos !== node2.pos");
+        assert.equal(node1.end, node2.end, "node1.end !== node2.end");
+        assert.equal(node1.kind, node2.kind, "node1.kind !== node2.kind");
+        // call this on both nodes to ensure all propagated flags have been set (and thus can be
+        // compared).
+        assert.equal(ts.containsParseError(node1), ts.containsParseError(node2));
+        assert.equal(node1.flags & ~1408 /* ReachabilityAndEmitFlags */, node2.flags & ~1408 /* ReachabilityAndEmitFlags */, "node1.flags !== node2.flags");
+        ts.forEachChild(node1, function (child1) {
+            var childName = findChildName(node1, child1);
+            var child2 = node2[childName];
+            assertStructuralEquals(child1, child2);
+        }, function (array1) {
+            var childName = findChildName(node1, array1);
+            var array2 = node2[childName];
+            assertArrayStructuralEquals(array1, array2);
+        });
+    }
+    Utils.assertStructuralEquals = assertStructuralEquals;
+    function assertArrayStructuralEquals(array1, array2) {
+        if (array1 === array2) {
+            return;
+        }
+        assert(array1, "array1");
+        assert(array2, "array2");
+        assert.equal(array1.pos, array2.pos, "array1.pos !== array2.pos");
+        assert.equal(array1.end, array2.end, "array1.end !== array2.end");
+        assert.equal(array1.length, array2.length, "array1.length !== array2.length");
+        for (var i = 0; i < array1.length; i++) {
+            assertStructuralEquals(array1[i], array2[i]);
+        }
+    }
+    function findChildName(parent, child) {
+        for (var name in parent) {
+            if (parent.hasOwnProperty(name) && parent[name] === child) {
+                return name;
+            }
+        }
+        throw new Error("Could not find child in parent");
+    }
+    var maxHarnessFrames = 1;
+    function filterStack(error, stackTraceLimit) {
+        if (stackTraceLimit === void 0) { stackTraceLimit = Infinity; }
+        var stack = error.stack;
+        if (stack) {
+            var lines = stack.split(/\r\n?|\n/g);
+            var filtered = [];
+            var frameCount = 0;
+            var harnessFrameCount = 0;
+            for (var _i = 0, lines_2 = lines; _i < lines_2.length; _i++) {
+                var line = lines_2[_i];
+                if (isStackFrame(line)) {
+                    if (frameCount >= stackTraceLimit
+                        || isMocha(line)
+                        || isNode(line)) {
+                        continue;
+                    }
+                    if (isHarness(line)) {
+                        if (harnessFrameCount >= maxHarnessFrames) {
+                            continue;
+                        }
+                        harnessFrameCount++;
+                    }
+                    line = line.replace(/\bfile:\/\/\/(.*?)(?=(:\d+)*($|\)))/, function (_, path) { return ts.sys.resolvePath(path); });
+                    frameCount++;
+                }
+                filtered.push(line);
+            }
+            error.stack = filtered.join(Harness.IO.newLine());
+        }
+        return error;
+    }
+    Utils.filterStack = filterStack;
+    function isStackFrame(line) {
+        return /^\s+at\s/.test(line);
+    }
+    function isMocha(line) {
+        return /[\\/](node_modules|components)[\\/]mocha(js)?[\\/]|[\\/]mocha\.js/.test(line);
+    }
+    function isNode(line) {
+        return /\((timers|events|node|module)\.js:/.test(line);
+    }
+    function isHarness(line) {
+        return /[\\/]src[\\/]harness[\\/]|[\\/]run\.js/.test(line);
+    }
+})(Utils || (Utils = {}));
+var Harness;
+(function (Harness) {
+    // harness always uses one kind of new line
+    // But note that `parseTestData` in `fourslash.ts` uses "\n"
+    Harness.harnessNewLine = "\r\n";
+    // Root for file paths that are stored in a virtual file system
+    Harness.virtualFileSystemRoot = "/";
+    function createNodeIO() {
+        var fs, pathModule;
+        if (require) {
+            fs = require("fs");
+            pathModule = require("path");
+        }
+        else {
+            fs = pathModule = {};
+        }
+        function deleteFile(path) {
+            try {
+                fs.unlinkSync(path);
+            }
+            catch ( /*ignore*/_a) { /*ignore*/ }
+        }
+        function directoryName(path) {
+            var dirPath = pathModule.dirname(path);
+            // Node will just continue to repeat the root path, rather than return null
+            return dirPath === path ? undefined : dirPath;
+        }
+        function enumerateTestFiles(runner) {
+            return runner.enumerateTestFiles();
+        }
+        function listFiles(path, spec, options) {
+            if (options === void 0) { options = {}; }
+            function filesInFolder(folder) {
+                var paths = [];
+                for (var _i = 0, _a = fs.readdirSync(folder); _i < _a.length; _i++) {
+                    var file = _a[_i];
+                    var pathToFile = pathModule.join(folder, file);
+                    var stat = fs.statSync(pathToFile);
+                    if (options.recursive && stat.isDirectory()) {
+                        paths = paths.concat(filesInFolder(pathToFile));
+                    }
+                    else if (stat.isFile() && (!spec || file.match(spec))) {
+                        paths.push(pathToFile);
+                    }
+                }
+                return paths;
+            }
+            return filesInFolder(path);
+        }
+        function getAccessibleFileSystemEntries(dirname) {
+            try {
+                var entries = fs.readdirSync(dirname || ".").sort(ts.sys.useCaseSensitiveFileNames ? ts.compareStringsCaseSensitive : ts.compareStringsCaseInsensitive);
+                var files = [];
+                var directories = [];
+                for (var _i = 0, entries_1 = entries; _i < entries_1.length; _i++) {
+                    var entry = entries_1[_i];
+                    if (entry === "." || entry === "..")
+                        continue;
+                    var name = vpath.combine(dirname, entry);
+                    try {
+                        var stat = fs.statSync(name);
+                        if (!stat)
+                            continue;
+                        if (stat.isFile()) {
+                            files.push(entry);
+                        }
+                        else if (stat.isDirectory()) {
+                            directories.push(entry);
+                        }
+                    }
+                    catch ( /*ignore*/_a) { /*ignore*/ }
+                }
+                return { files: files, directories: directories };
+            }
+            catch (e) {
+                return { files: [], directories: [] };
+            }
+        }
+        function createDirectory(path) {
+            try {
+                fs.mkdirSync(path);
+            }
+            catch (e) {
+                if (e.code === "ENOENT") {
+                    createDirectory(vpath.dirname(path));
+                    createDirectory(path);
+                }
+                else if (!ts.sys.directoryExists(path)) {
+                    throw e;
+                }
+            }
+        }
+        return {
+            newLine: function () { return Harness.harnessNewLine; },
+            getCurrentDirectory: function () { return ts.sys.getCurrentDirectory(); },
+            useCaseSensitiveFileNames: function () { return ts.sys.useCaseSensitiveFileNames; },
+            resolvePath: function (path) { return ts.sys.resolvePath(path); },
+            getFileSize: function (path) { return ts.sys.getFileSize(path); },
+            readFile: function (path) { return ts.sys.readFile(path); },
+            writeFile: function (path, content) { return ts.sys.writeFile(path, content); },
+            directoryName: directoryName,
+            getDirectories: function (path) { return ts.sys.getDirectories(path); },
+            createDirectory: createDirectory,
+            fileExists: function (path) { return ts.sys.fileExists(path); },
+            directoryExists: function (path) { return ts.sys.directoryExists(path); },
+            deleteFile: deleteFile,
+            listFiles: listFiles,
+            enumerateTestFiles: enumerateTestFiles,
+            log: function (s) { return console.log(s); },
+            args: function () { return ts.sys.args; },
+            getExecutingFilePath: function () { return ts.sys.getExecutingFilePath(); },
+            getWorkspaceRoot: function () { return vpath.resolve(__dirname, "../.."); },
+            exit: function (exitCode) { return ts.sys.exit(exitCode); },
+            readDirectory: function (path, extension, exclude, include, depth) { return ts.sys.readDirectory(path, extension, exclude, include, depth); },
+            getAccessibleFileSystemEntries: getAccessibleFileSystemEntries,
+            tryEnableSourceMapsForHost: function () { return ts.sys.tryEnableSourceMapsForHost && ts.sys.tryEnableSourceMapsForHost(); },
+            getMemoryUsage: function () { return ts.sys.getMemoryUsage && ts.sys.getMemoryUsage(); },
+            getEnvironmentVariable: function (name) { return ts.sys.getEnvironmentVariable(name); },
+        };
+    }
+    function createBrowserIO() {
+        var serverRoot = new URL("http://localhost:8888/");
+        var HttpHeaders = /** @class */ (function (_super) {
+            __extends(HttpHeaders, _super);
+            function HttpHeaders(template) {
+                var _this = _super.call(this, ts.compareStringsCaseInsensitive) || this;
+                if (template) {
+                    for (var key in template) {
+                        if (ts.hasProperty(template, key)) {
+                            _this.set(key, template[key]);
+                        }
+                    }
+                }
+                return _this;
+            }
+            HttpHeaders.combine = function (left, right) {
+                if (!left && !right)
+                    return undefined;
+                var headers = new HttpHeaders();
+                if (left)
+                    left.forEach(function (value, key) { headers.set(key, value); });
+                if (right)
+                    right.forEach(function (value, key) { headers.set(key, value); });
+                return headers;
+            };
+            HttpHeaders.prototype.has = function (key) {
+                return _super.prototype.has.call(this, key.toLowerCase());
+            };
+            HttpHeaders.prototype.get = function (key) {
+                return _super.prototype.get.call(this, key.toLowerCase());
+            };
+            HttpHeaders.prototype.set = function (key, value) {
+                return _super.prototype.set.call(this, key.toLowerCase(), value);
+            };
+            HttpHeaders.prototype.delete = function (key) {
+                return _super.prototype.delete.call(this, key.toLowerCase());
+            };
+            HttpHeaders.prototype.writeRequestHeaders = function (xhr) {
+                this.forEach(function (values, key) {
+                    if (key === "access-control-allow-origin" || key === "content-length")
+                        return;
+                    var value = Array.isArray(values) ? values.join(",") : values;
+                    if (key === "content-type") {
+                        xhr.overrideMimeType(value);
+                        return;
+                    }
+                    xhr.setRequestHeader(key, value);
+                });
+            };
+            HttpHeaders.readResponseHeaders = function (xhr) {
+                var allHeaders = xhr.getAllResponseHeaders();
+                var headers = new HttpHeaders();
+                for (var _i = 0, _a = allHeaders.split(/\r\n/g); _i < _a.length; _i++) {
+                    var header = _a[_i];
+                    var colonIndex = header.indexOf(":");
+                    if (colonIndex >= 0) {
+                        var key = header.slice(0, colonIndex).trim();
+                        var value = header.slice(colonIndex + 1).trim();
+                        var values = value.split(",");
+                        headers.set(key, values.length > 1 ? values : value);
+                    }
+                }
+                return headers;
+            };
+            return HttpHeaders;
+        }(collections.SortedMap));
+        var HttpContent = /** @class */ (function () {
+            function HttpContent(headers, content) {
+                this.headers = headers instanceof HttpHeaders ? headers : new HttpHeaders(headers);
+                this.content = content;
+            }
+            HttpContent.fromMediaType = function (mediaType, content) {
+                return new HttpContent({ "Content-Type": mediaType }, content);
+            };
+            HttpContent.text = function (content) {
+                return HttpContent.fromMediaType("text/plain", content);
+            };
+            HttpContent.json = function (content) {
+                return HttpContent.fromMediaType("application/json", JSON.stringify(content));
+            };
+            HttpContent.readResponseContent = function (xhr) {
+                if (typeof xhr.responseText === "string") {
+                    return new HttpContent({
+                        "Content-Type": xhr.getResponseHeader("Content-Type") || undefined,
+                        "Content-Length": xhr.getResponseHeader("Content-Length") || undefined,
+                    }, xhr.responseText);
+                }
+                return undefined;
+            };
+            HttpContent.prototype.writeRequestHeaders = function (xhr) {
+                this.headers.writeRequestHeaders(xhr);
+            };
+            return HttpContent;
+        }());
+        var HttpRequestMessage = /** @class */ (function () {
+            function HttpRequestMessage(method, url, headers, content) {
+                this.method = method;
+                this.url = typeof url === "string" ? new URL(url) : url;
+                this.headers = headers instanceof HttpHeaders ? headers : new HttpHeaders(headers);
+                this.content = content;
+            }
+            HttpRequestMessage.options = function (url) {
+                return new HttpRequestMessage("OPTIONS", url);
+            };
+            HttpRequestMessage.head = function (url) {
+                return new HttpRequestMessage("HEAD", url);
+            };
+            HttpRequestMessage.get = function (url) {
+                return new HttpRequestMessage("GET", url);
+            };
+            HttpRequestMessage.delete = function (url) {
+                return new HttpRequestMessage("DELETE", url);
+            };
+            HttpRequestMessage.put = function (url, content) {
+                return new HttpRequestMessage("PUT", url, /*headers*/ undefined, content);
+            };
+            HttpRequestMessage.post = function (url, content) {
+                return new HttpRequestMessage("POST", url, /*headers*/ undefined, content);
+            };
+            HttpRequestMessage.prototype.writeRequestHeaders = function (xhr) {
+                this.headers.writeRequestHeaders(xhr);
+                if (this.content) {
+                    this.content.writeRequestHeaders(xhr);
+                }
+            };
+            return HttpRequestMessage;
+        }());
+        var HttpResponseMessage = /** @class */ (function () {
+            function HttpResponseMessage(statusCode, statusMessage, headers, content) {
+                this.statusCode = statusCode;
+                this.statusMessage = statusMessage;
+                this.headers = headers instanceof HttpHeaders ? headers : new HttpHeaders(headers);
+                this.content = content;
+            }
+            HttpResponseMessage.notFound = function () {
+                return new HttpResponseMessage(404, "Not Found");
+            };
+            HttpResponseMessage.hasSuccessStatusCode = function (response) {
+                return response.statusCode === 304 || (response.statusCode >= 200 && response.statusCode < 300);
+            };
+            HttpResponseMessage.readResponseMessage = function (xhr) {
+                return new HttpResponseMessage(xhr.status, xhr.statusText, HttpHeaders.readResponseHeaders(xhr), HttpContent.readResponseContent(xhr));
+            };
+            return HttpResponseMessage;
+        }());
+        function send(request) {
+            var xhr = new XMLHttpRequest();
+            try {
+                xhr.open(request.method, request.url.toString(), /*async*/ false);
+                request.writeRequestHeaders(xhr);
+                xhr.setRequestHeader("Access-Control-Allow-Origin", "*");
+                xhr.send(request.content && request.content.content);
+                while (xhr.readyState !== 4)
+                    ; // block until ready
+                return HttpResponseMessage.readResponseMessage(xhr);
+            }
+            catch (e) {
+                return HttpResponseMessage.notFound();
+            }
+        }
+        var caseSensitivity;
+        function useCaseSensitiveFileNames() {
+            if (!caseSensitivity) {
+                var response = send(HttpRequestMessage.options(new URL("*", serverRoot)));
+                var xCaseSensitivity = response.headers.get("X-Case-Sensitivity");
+                caseSensitivity = xCaseSensitivity === "CS" ? "CS" : "CI";
+            }
+            return caseSensitivity === "CS";
+        }
+        function resolvePath(path) {
+            var response = send(HttpRequestMessage.post(new URL("/api/resolve", serverRoot), HttpContent.text(path)));
+            return HttpResponseMessage.hasSuccessStatusCode(response) && response.content ? response.content.content : undefined;
+        }
+        function getFileSize(path) {
+            var response = send(HttpRequestMessage.head(new URL(path, serverRoot)));
+            return HttpResponseMessage.hasSuccessStatusCode(response) ? +response.headers.get("Content-Length").toString() : 0;
+        }
+        function readFile(path) {
+            var response = send(HttpRequestMessage.get(new URL(path, serverRoot)));
+            return HttpResponseMessage.hasSuccessStatusCode(response) && response.content ? response.content.content : undefined;
+        }
+        function writeFile(path, contents) {
+            send(HttpRequestMessage.put(new URL(path, serverRoot), HttpContent.text(contents)));
+        }
+        function fileExists(path) {
+            var response = send(HttpRequestMessage.head(new URL(path, serverRoot)));
+            return HttpResponseMessage.hasSuccessStatusCode(response);
+        }
+        function directoryExists(path) {
+            var response = send(HttpRequestMessage.post(new URL("/api/directoryExists", serverRoot), HttpContent.text(path)));
+            return hasJsonContent(response) && JSON.parse(response.content.content);
+        }
+        function deleteFile(path) {
+            send(HttpRequestMessage.delete(new URL(path, serverRoot)));
+        }
+        function directoryName(path) {
+            var url = new URL(path, serverRoot);
+            return ts.getDirectoryPath(ts.normalizeSlashes(url.pathname || "/"));
+        }
+        function enumerateTestFiles(runner) {
+            var response = send(HttpRequestMessage.post(new URL("/api/enumerateTestFiles", serverRoot), HttpContent.text(runner.kind())));
+            return hasJsonContent(response) ? JSON.parse(response.content.content) : [];
+        }
+        function listFiles(dirname, spec, options) {
+            if (spec || (options && !options.recursive)) {
+                var results = Harness.IO.listFiles(dirname);
+                if (spec) {
+                    results = results.filter(function (file) { return spec.test(file); });
+                }
+                if (options && !options.recursive) {
+                    results = results.filter(function (file) { return ts.getDirectoryPath(ts.normalizeSlashes(file)) === dirname; });
+                }
+                return results;
+            }
+            var response = send(HttpRequestMessage.post(new URL("/api/listFiles", serverRoot), HttpContent.text(dirname)));
+            return hasJsonContent(response) ? JSON.parse(response.content.content) : [];
+        }
+        function readDirectory(path, extension, exclude, include, depth) {
+            return ts.matchFiles(path, extension, exclude, include, useCaseSensitiveFileNames(), "", depth, getAccessibleFileSystemEntries);
+        }
+        function getAccessibleFileSystemEntries(dirname) {
+            var response = send(HttpRequestMessage.post(new URL("/api/getAccessibleFileSystemEntries", serverRoot), HttpContent.text(dirname)));
+            return hasJsonContent(response) ? JSON.parse(response.content.content) : { files: [], directories: [] };
+        }
+        function hasJsonContent(response) {
+            return HttpResponseMessage.hasSuccessStatusCode(response)
+                && !!response.content
+                && /^application\/json(;.*)$/.test("" + response.content.headers.get("Content-Type"));
+        }
+        return {
+            newLine: function () { return Harness.harnessNewLine; },
+            getCurrentDirectory: function () { return ""; },
+            useCaseSensitiveFileNames: useCaseSensitiveFileNames,
+            resolvePath: resolvePath,
+            getFileSize: getFileSize,
+            readFile: readFile,
+            writeFile: writeFile,
+            directoryName: Utils.memoize(directoryName, function (path) { return path; }),
+            getDirectories: function () { return []; },
+            createDirectory: function () { },
+            fileExists: fileExists,
+            directoryExists: directoryExists,
+            deleteFile: deleteFile,
+            listFiles: Utils.memoize(listFiles, function (path, spec, options) { return path + "|" + spec + "|" + (options ? options.recursive === true : true); }),
+            enumerateTestFiles: Utils.memoize(enumerateTestFiles, function (runner) { return runner.kind(); }),
+            log: function (s) { return console.log(s); },
+            args: function () { return []; },
+            getExecutingFilePath: function () { return ""; },
+            exit: function () { },
+            readDirectory: readDirectory,
+            getAccessibleFileSystemEntries: getAccessibleFileSystemEntries,
+            getWorkspaceRoot: function () { return "/"; }
+        };
+    }
+    function mockHash(s) {
+        return "hash-" + s;
+    }
+    Harness.mockHash = mockHash;
+    var environment = Utils.getExecutionEnvironment();
+    switch (environment) {
+        case 0 /* Node */:
+            Harness.IO = createNodeIO();
+            break;
+        case 1 /* Browser */:
+            Harness.IO = createBrowserIO();
+            break;
+        default:
+            throw new Error("Unknown value '" + environment + "' for ExecutionEnvironment.");
+    }
+})(Harness || (Harness = {}));
+if (Harness.IO.tryEnableSourceMapsForHost && /^development$/i.test(Harness.IO.getEnvironmentVariable("NODE_ENV"))) {
+    Harness.IO.tryEnableSourceMapsForHost();
+}
+(function (Harness) {
+    Harness.libFolder = "built/local/";
+    var tcServicesFileName = ts.combinePaths(Harness.libFolder, Utils.getExecutionEnvironment() === 1 /* Browser */ ? "typescriptServicesInBrowserTest.js" : "typescriptServices.js");
+    Harness.tcServicesFile = Harness.IO.readFile(tcServicesFileName) + (Utils.getExecutionEnvironment() !== 1 /* Browser */
+        ? Harness.IO.newLine() + ("//# sourceURL=" + Harness.IO.resolvePath(tcServicesFileName))
+        : "");
+    // Settings
+    Harness.userSpecifiedRoot = "";
+    Harness.lightMode = false;
+    /** Functionality for compiling TypeScript code */
+    var Compiler;
+    (function (Compiler) {
+        /** Aggregate various writes into a single array of lines. Useful for passing to the
+         *  TypeScript compiler to fill with source code or errors.
+         */
+        var WriterAggregator = /** @class */ (function () {
+            function WriterAggregator() {
+                this.lines = [];
+                this.currentLine = undefined;
+            }
+            WriterAggregator.prototype.Write = function (str) {
+                // out of memory usage concerns avoid using + or += if we're going to do any manipulation of this string later
+                this.currentLine = [(this.currentLine || ""), str].join("");
+            };
+            WriterAggregator.prototype.WriteLine = function (str) {
+                // out of memory usage concerns avoid using + or += if we're going to do any manipulation of this string later
+                this.lines.push([(this.currentLine || ""), str].join(""));
+                this.currentLine = undefined;
+            };
+            WriterAggregator.prototype.Close = function () {
+                if (this.currentLine !== undefined) {
+                    this.lines.push(this.currentLine);
+                }
+                this.currentLine = undefined;
+            };
+            WriterAggregator.prototype.reset = function () {
+                this.lines = [];
+                this.currentLine = undefined;
+            };
+            return WriterAggregator;
+        }());
+        Compiler.WriterAggregator = WriterAggregator;
+        function createSourceFileAndAssertInvariants(fileName, sourceText, languageVersion) {
+            // We'll only assert invariants outside of light mode.
+            var shouldAssertInvariants = !Harness.lightMode;
+            // Only set the parent nodes if we're asserting invariants.  We don't need them otherwise.
+            var result = ts.createSourceFile(fileName, sourceText, languageVersion, /*setParentNodes:*/ shouldAssertInvariants);
+            if (shouldAssertInvariants) {
+                Utils.assertInvariants(result, /*parent:*/ undefined);
+            }
+            return result;
+        }
+        Compiler.createSourceFileAndAssertInvariants = createSourceFileAndAssertInvariants;
+        Compiler.defaultLibFileName = "lib.d.ts";
+        Compiler.es2015DefaultLibFileName = "lib.es2015.d.ts";
+        // Cache of lib files from "built/local"
+        var libFileNameSourceFileMap;
+        function getDefaultLibrarySourceFile(fileName) {
+            if (fileName === void 0) { fileName = Compiler.defaultLibFileName; }
+            var _a;
+            if (!isDefaultLibraryFile(fileName)) {
+                return undefined;
+            }
+            if (!libFileNameSourceFileMap) {
+                libFileNameSourceFileMap = ts.createMapFromTemplate((_a = {},
+                    _a[Compiler.defaultLibFileName] = createSourceFileAndAssertInvariants(Compiler.defaultLibFileName, Harness.IO.readFile(Harness.libFolder + "lib.es5.d.ts"), /*languageVersion*/ 6 /* Latest */),
+                    _a));
+            }
+            var sourceFile = libFileNameSourceFileMap.get(fileName);
+            if (!sourceFile) {
+                libFileNameSourceFileMap.set(fileName, sourceFile = createSourceFileAndAssertInvariants(fileName, Harness.IO.readFile(Harness.libFolder + fileName), 6 /* Latest */));
+            }
+            return sourceFile;
+        }
+        Compiler.getDefaultLibrarySourceFile = getDefaultLibrarySourceFile;
+        function getDefaultLibFileName(options) {
+            switch (options.target) {
+                case 6 /* ESNext */:
+                case 4 /* ES2017 */:
+                    return "lib.es2017.d.ts";
+                case 3 /* ES2016 */:
+                    return "lib.es2016.d.ts";
+                case 2 /* ES2015 */:
+                    return Compiler.es2015DefaultLibFileName;
+                default:
+                    return Compiler.defaultLibFileName;
+            }
+        }
+        Compiler.getDefaultLibFileName = getDefaultLibFileName;
+        // Cache these between executions so we don't have to re-parse them for every test
+        Compiler.fourslashFileName = "fourslash.ts";
+        function getCanonicalFileName(fileName) {
+            return fileName;
+        }
+        Compiler.getCanonicalFileName = getCanonicalFileName;
+        // Additional options not already in ts.optionDeclarations
+        var harnessOptionDeclarations = [
+            { name: "allowNonTsExtensions", type: "boolean" },
+            { name: "useCaseSensitiveFileNames", type: "boolean" },
+            { name: "baselineFile", type: "string" },
+            { name: "includeBuiltFile", type: "string" },
+            { name: "fileName", type: "string" },
+            { name: "libFiles", type: "string" },
+            { name: "noErrorTruncation", type: "boolean" },
+            { name: "suppressOutputPathCheck", type: "boolean" },
+            { name: "noImplicitReferences", type: "boolean" },
+            { name: "currentDirectory", type: "string" },
+            { name: "symlink", type: "string" },
+            // Emitted js baseline will print full paths for every output file
+            { name: "fullEmitPaths", type: "boolean" }
+        ];
+        var optionsIndex;
+        function getCommandLineOption(name) {
+            if (!optionsIndex) {
+                optionsIndex = ts.createMap();
+                var optionDeclarations = harnessOptionDeclarations.concat(ts.optionDeclarations);
+                for (var _i = 0, optionDeclarations_1 = optionDeclarations; _i < optionDeclarations_1.length; _i++) {
+                    var option = optionDeclarations_1[_i];
+                    optionsIndex.set(option.name.toLowerCase(), option);
+                }
+            }
+            return optionsIndex.get(name.toLowerCase());
+        }
+        function setCompilerOptionsFromHarnessSetting(settings, options) {
+            for (var name in settings) {
+                if (settings.hasOwnProperty(name)) {
+                    var value = settings[name];
+                    if (value === undefined) {
+                        throw new Error("Cannot have undefined value for compiler option '" + name + "'.");
+                    }
+                    var option = getCommandLineOption(name);
+                    if (option) {
+                        var errors = [];
+                        options[option.name] = optionValue(option, value, errors);
+                        if (errors.length > 0) {
+                            throw new Error("Unknown value '" + value + "' for compiler option '" + name + "'.");
+                        }
+                    }
+                    else {
+                        throw new Error("Unknown compiler option '" + name + "'.");
+                    }
+                }
+            }
+        }
+        Compiler.setCompilerOptionsFromHarnessSetting = setCompilerOptionsFromHarnessSetting;
+        function optionValue(option, value, errors) {
+            switch (option.type) {
+                case "boolean":
+                    return value.toLowerCase() === "true";
+                case "string":
+                    return value;
+                case "number": {
+                    var numverValue = parseInt(value, 10);
+                    if (isNaN(numverValue)) {
+                        throw new Error("Value must be a number, got: " + JSON.stringify(value));
+                    }
+                    return numverValue;
+                }
+                // If not a primitive, the possible types are specified in what is effectively a map of options.
+                case "list":
+                    return ts.parseListTypeOption(option, value, errors);
+                default:
+                    return ts.parseCustomTypeOption(option, value, errors);
+            }
+        }
+        function compileFiles(inputFiles, otherFiles, harnessSettings, compilerOptions, 
+        // Current directory is needed for rwcRunner to be able to use currentDirectory defined in json file
+        currentDirectory) {
+            var options = compilerOptions ? ts.cloneCompilerOptions(compilerOptions) : { noResolve: false };
+            options.target = options.target || 0 /* ES3 */;
+            options.newLine = options.newLine || 0 /* CarriageReturnLineFeed */;
+            options.noErrorTruncation = true;
+            options.skipDefaultLibCheck = typeof options.skipDefaultLibCheck === "undefined" ? true : options.skipDefaultLibCheck;
+            if (typeof currentDirectory === "undefined") {
+                currentDirectory = vfs.srcFolder;
+            }
+            // Parse settings
+            if (harnessSettings) {
+                setCompilerOptionsFromHarnessSetting(harnessSettings, options);
+            }
+            if (options.rootDirs) {
+                options.rootDirs = ts.map(options.rootDirs, function (d) { return ts.getNormalizedAbsolutePath(d, currentDirectory); });
+            }
+            var useCaseSensitiveFileNames = options.useCaseSensitiveFileNames !== undefined ? options.useCaseSensitiveFileNames : true;
+            var programFileNames = inputFiles.map(function (file) { return file.unitName; }).filter(function (fileName) { return !ts.fileExtensionIs(fileName, ".json" /* Json */); });
+            // Files from built\local that are requested by test "@includeBuiltFiles" to be in the context.
+            // Treat them as library files, so include them in build, but not in baselines.
+            if (options.includeBuiltFile) {
+                programFileNames.push(vpath.combine(vfs.builtFolder, options.includeBuiltFile));
+            }
+            // Files from tests\lib that are requested by "@libFiles"
+            if (options.libFiles) {
+                for (var _i = 0, _a = options.libFiles.split(","); _i < _a.length; _i++) {
+                    var fileName = _a[_i];
+                    programFileNames.push(vpath.combine(vfs.testLibFolder, fileName));
+                }
+            }
+            var docs = inputFiles.concat(otherFiles).map(documents.TextDocument.fromTestFile);
+            var fs = vfs.createFromFileSystem(Harness.IO, !useCaseSensitiveFileNames, { documents: docs, cwd: currentDirectory });
+            var host = new fakes.CompilerHost(fs, options);
+            return compiler.compileFiles(host, programFileNames, options);
+        }
+        Compiler.compileFiles = compileFiles;
+        function prepareDeclarationCompilationContext(inputFiles, otherFiles, result, harnessSettings, options, 
+        // Current directory is needed for rwcRunner to be able to use currentDirectory defined in json file
+        currentDirectory) {
+            if (options.declaration && result.diagnostics.length === 0) {
+                if (options.emitDeclarationOnly) {
+                    if (result.js.size > 0 || result.dts.size === 0) {
+                        throw new Error("Only declaration files should be generated when emitDeclarationOnly:true");
+                    }
+                }
+                else if (result.dts.size !== result.getNumberOfJsFiles()) {
+                    throw new Error("There were no errors and declFiles generated did not match number of js files generated");
+                }
+            }
+            var declInputFiles = [];
+            var declOtherFiles = [];
+            // if the .d.ts is non-empty, confirm it compiles correctly as well
+            if (options.declaration && result.diagnostics.length === 0 && result.dts.size > 0) {
+                ts.forEach(inputFiles, function (file) { return addDtsFile(file, declInputFiles); });
+                ts.forEach(otherFiles, function (file) { return addDtsFile(file, declOtherFiles); });
+                return { declInputFiles: declInputFiles, declOtherFiles: declOtherFiles, harnessSettings: harnessSettings, options: options, currentDirectory: currentDirectory || harnessSettings.currentDirectory };
+            }
+            function addDtsFile(file, dtsFiles) {
+                if (vpath.isDeclaration(file.unitName)) {
+                    dtsFiles.push(file);
+                }
+                else if (vpath.isTypeScript(file.unitName)) {
+                    var declFile = findResultCodeFile(file.unitName);
+                    if (declFile && !findUnit(declFile.file, declInputFiles) && !findUnit(declFile.file, declOtherFiles)) {
+                        dtsFiles.push({ unitName: declFile.file, content: utils.removeByteOrderMark(declFile.text) });
+                    }
+                }
+            }
+            function findResultCodeFile(fileName) {
+                var sourceFile = result.program.getSourceFile(fileName);
+                assert(sourceFile, "Program has no source file with name '" + fileName + "'");
+                // Is this file going to be emitted separately
+                var sourceFileName;
+                var outFile = options.outFile || options.out;
+                if (!outFile) {
+                    if (options.outDir) {
+                        var sourceFilePath = ts.getNormalizedAbsolutePath(sourceFile.fileName, result.vfs.cwd());
+                        sourceFilePath = sourceFilePath.replace(result.program.getCommonSourceDirectory(), "");
+                        sourceFileName = ts.combinePaths(options.outDir, sourceFilePath);
+                    }
+                    else {
+                        sourceFileName = sourceFile.fileName;
+                    }
+                }
+                else {
+                    // Goes to single --out file
+                    sourceFileName = outFile;
+                }
+                var dTsFileName = ts.removeFileExtension(sourceFileName) + ".d.ts" /* Dts */;
+                return result.dts.get(dTsFileName);
+            }
+            function findUnit(fileName, units) {
+                return ts.forEach(units, function (unit) { return unit.unitName === fileName ? unit : undefined; });
+            }
+        }
+        Compiler.prepareDeclarationCompilationContext = prepareDeclarationCompilationContext;
+        function compileDeclarationFiles(context) {
+            if (!context) {
+                return;
+            }
+            var declInputFiles = context.declInputFiles, declOtherFiles = context.declOtherFiles, harnessSettings = context.harnessSettings, options = context.options, currentDirectory = context.currentDirectory;
+            var output = compileFiles(declInputFiles, declOtherFiles, harnessSettings, options, currentDirectory);
+            return { declInputFiles: declInputFiles, declOtherFiles: declOtherFiles, declResult: output };
+        }
+        Compiler.compileDeclarationFiles = compileDeclarationFiles;
+        function minimalDiagnosticsToString(diagnostics, pretty) {
+            var host = { getCanonicalFileName: getCanonicalFileName, getCurrentDirectory: function () { return ""; }, getNewLine: function () { return Harness.IO.newLine(); } };
+            return (pretty ? ts.formatDiagnosticsWithColorAndContext : ts.formatDiagnostics)(diagnostics, host);
+        }
+        Compiler.minimalDiagnosticsToString = minimalDiagnosticsToString;
+        function getErrorBaseline(inputFiles, diagnostics, pretty) {
+            var _a;
+            var outputLines = "";
+            var gen = iterateErrorBaseline(inputFiles, diagnostics, { pretty: pretty });
+            for (var _b = gen.next(), done = _b.done, value = _b.value; !done; _a = gen.next(), done = _a.done, value = _a.value, _a) {
+                var content = value[1];
+                outputLines += content;
+            }
+            return outputLines;
+        }
+        Compiler.getErrorBaseline = getErrorBaseline;
+        Compiler.diagnosticSummaryMarker = "__diagnosticSummary";
+        Compiler.globalErrorsMarker = "__globalErrors";
+        function iterateErrorBaseline(inputFiles, diagnostics, options) {
+            function newLine() {
+                if (firstLine) {
+                    firstLine = false;
+                    return "";
+                }
+                return "\r\n";
+            }
+            function outputErrorText(error) {
+                var message = ts.flattenDiagnosticMessageText(error.messageText, Harness.IO.newLine());
+                var errLines = utils.removeTestPathPrefixes(message)
+                    .split("\n")
+                    .map(function (s) { return s.length > 0 && s.charAt(s.length - 1) === "\r" ? s.substr(0, s.length - 1) : s; })
+                    .filter(function (s) { return s.length > 0; })
+                    .map(function (s) { return "!!! " + ts.diagnosticCategoryName(error) + " TS" + error.code + ": " + s; });
+                errLines.forEach(function (e) { return outputLines += (newLine() + e); });
+                errorsReported++;
+                // do not count errors from lib.d.ts here, they are computed separately as numLibraryDiagnostics
+                // if lib.d.ts is explicitly included in input files and there are some errors in it (i.e. because of duplicate identifiers)
+                // then they will be added twice thus triggering 'total errors' assertion with condition
+                // 'totalErrorsReportedInNonLibraryFiles + numLibraryDiagnostics + numTest262HarnessDiagnostics, diagnostics.length
+                if (!error.file || !isDefaultLibraryFile(error.file.fileName)) {
+                    totalErrorsReportedInNonLibraryFiles++;
+                }
+            }
+            var outputLines, totalErrorsReportedInNonLibraryFiles, errorsReported, firstLine, globalErrors, dupeCase, _loop_1, _i, _a, inputFile, numLibraryDiagnostics, numTest262HarnessDiagnostics;
+            return __generator(this, function (_b) {
+                switch (_b.label) {
+                    case 0:
+                        diagnostics = ts.sort(diagnostics, ts.compareDiagnostics);
+                        outputLines = "";
+                        totalErrorsReportedInNonLibraryFiles = 0;
+                        errorsReported = 0;
+                        firstLine = true;
+                        return [4 /*yield*/, [Compiler.diagnosticSummaryMarker, utils.removeTestPathPrefixes(minimalDiagnosticsToString(diagnostics, options && options.pretty)) + Harness.IO.newLine() + Harness.IO.newLine(), diagnostics.length]];
+                    case 1:
+                        _b.sent();
+                        globalErrors = diagnostics.filter(function (err) { return !err.file; });
+                        globalErrors.forEach(outputErrorText);
+                        return [4 /*yield*/, [Compiler.globalErrorsMarker, outputLines, errorsReported]];
+                    case 2:
+                        _b.sent();
+                        outputLines = "";
+                        errorsReported = 0;
+                        dupeCase = ts.createMap();
+                        _loop_1 = function (inputFile) {
+                            var fileErrors, markedErrorCount, lineStarts, lines, isDupe;
+                            return __generator(this, function (_a) {
+                                switch (_a.label) {
+                                    case 0:
+                                        fileErrors = diagnostics.filter(function (e) {
+                                            var errFn = e.file;
+                                            return !!errFn && ts.comparePaths(utils.removeTestPathPrefixes(errFn.fileName), utils.removeTestPathPrefixes(inputFile.unitName), options && options.currentDirectory || "", !(options && options.caseSensitive)) === 0 /* EqualTo */;
+                                        });
+                                        // Header
+                                        outputLines += (newLine() + "==== " + inputFile.unitName + " (" + fileErrors.length + " errors) ====");
+                                        markedErrorCount = 0;
+                                        lineStarts = ts.computeLineStarts(inputFile.content);
+                                        lines = inputFile.content.split("\n");
+                                        if (lines.length === 1) {
+                                            lines = lines[0].split("\r");
+                                        }
+                                        lines.forEach(function (line, lineIndex) {
+                                            if (line.length > 0 && line.charAt(line.length - 1) === "\r") {
+                                                line = line.substr(0, line.length - 1);
+                                            }
+                                            var thisLineStart = lineStarts[lineIndex];
+                                            var nextLineStart;
+                                            // On the last line of the file, fake the next line start number so that we handle errors on the last character of the file correctly
+                                            if (lineIndex === lines.length - 1) {
+                                                nextLineStart = inputFile.content.length;
+                                            }
+                                            else {
+                                                nextLineStart = lineStarts[lineIndex + 1];
+                                            }
+                                            // Emit this line from the original file
+                                            outputLines += (newLine() + "    " + line);
+                                            fileErrors.forEach(function (errDiagnostic) {
+                                                var err = errDiagnostic; // TODO: GH#18217
+                                                // Does any error start or continue on to this line? Emit squiggles
+                                                var end = ts.textSpanEnd(err);
+                                                if ((end >= thisLineStart) && ((err.start < nextLineStart) || (lineIndex === lines.length - 1))) {
+                                                    // How many characters from the start of this line the error starts at (could be positive or negative)
+                                                    var relativeOffset = err.start - thisLineStart;
+                                                    // How many characters of the error are on this line (might be longer than this line in reality)
+                                                    var length = (end - err.start) - Math.max(0, thisLineStart - err.start);
+                                                    // Calculate the start of the squiggle
+                                                    var squiggleStart = Math.max(0, relativeOffset);
+                                                    // TODO/REVIEW: this doesn't work quite right in the browser if a multi file test has files whose names are just the right length relative to one another
+                                                    outputLines += (newLine() + "    " + line.substr(0, squiggleStart).replace(/[^\s]/g, " ") + new Array(Math.min(length, line.length - squiggleStart) + 1).join("~"));
+                                                    // If the error ended here, or we're at the end of the file, emit its message
+                                                    if ((lineIndex === lines.length - 1) || nextLineStart > end) {
+                                                        // Just like above, we need to do a split on a string instead of on a regex
+                                                        // because the JS engine does regexes wrong
+                                                        outputErrorText(errDiagnostic);
+                                                        markedErrorCount++;
+                                                    }
+                                                }
+                                            });
+                                        });
+                                        // Verify we didn't miss any errors in this file
+                                        assert.equal(markedErrorCount, fileErrors.length, "count of errors in " + inputFile.unitName);
+                                        isDupe = dupeCase.has(sanitizeTestFilePath(inputFile.unitName));
+                                        return [4 /*yield*/, [checkDuplicatedFileName(inputFile.unitName, dupeCase), outputLines, errorsReported]];
+                                    case 1:
+                                        _a.sent();
+                                        if (isDupe && !(options && options.caseSensitive)) {
+                                            // Case-duplicated files on a case-insensitive build will have errors reported in both the dupe and the original
+                                            // thanks to the canse-insensitive path comparison on the error file path - We only want to count those errors once
+                                            // for the assert below, so we subtract them here.
+                                            totalErrorsReportedInNonLibraryFiles -= errorsReported;
+                                        }
+                                        outputLines = "";
+                                        errorsReported = 0;
+                                        return [2 /*return*/];
+                                }
+                            });
+                        };
+                        _i = 0, _a = inputFiles.filter(function (f) { return f.content !== undefined; });
+                        _b.label = 3;
+                    case 3:
+                        if (!(_i < _a.length)) return [3 /*break*/, 6];
+                        inputFile = _a[_i];
+                        return [5 /*yield**/, _loop_1(inputFile)];
+                    case 4:
+                        _b.sent();
+                        _b.label = 5;
+                    case 5:
+                        _i++;
+                        return [3 /*break*/, 3];
+                    case 6:
+                        numLibraryDiagnostics = ts.countWhere(diagnostics, function (diagnostic) {
+                            return !!diagnostic.file && (isDefaultLibraryFile(diagnostic.file.fileName) || isBuiltFile(diagnostic.file.fileName));
+                        });
+                        numTest262HarnessDiagnostics = ts.countWhere(diagnostics, function (diagnostic) {
+                            // Count an error generated from tests262-harness folder.This should only apply for test262
+                            return !!diagnostic.file && diagnostic.file.fileName.indexOf("test262-harness") >= 0;
+                        });
+                        // Verify we didn't miss any errors in total
+                        assert.equal(totalErrorsReportedInNonLibraryFiles + numLibraryDiagnostics + numTest262HarnessDiagnostics, diagnostics.length, "total number of errors");
+                        return [2 /*return*/];
+                }
+            });
+        }
+        Compiler.iterateErrorBaseline = iterateErrorBaseline;
+        function doErrorBaseline(baselinePath, inputFiles, errors, pretty) {
+            Baseline.runBaseline(baselinePath.replace(/\.tsx?$/, ".errors.txt"), function () {
+                if (!errors || (errors.length === 0)) {
+                    /* tslint:disable:no-null-keyword */
+                    return null;
+                    /* tslint:enable:no-null-keyword */
+                }
+                return getErrorBaseline(inputFiles, errors, pretty);
+            });
+        }
+        Compiler.doErrorBaseline = doErrorBaseline;
+        function doTypeAndSymbolBaseline(baselinePath, program, allFiles, opts, multifile, skipTypeBaselines, skipSymbolBaselines) {
+            // The full walker simulates the types that you would get from doing a full
+            // compile.  The pull walker simulates the types you get when you just do
+            // a type query for a random node (like how the LS would do it).  Most of the
+            // time, these will be the same.  However, occasionally, they can be different.
+            // Specifically, when the compiler internally depends on symbol IDs to order
+            // things, then we may see different results because symbols can be created in a
+            // different order with 'pull' operations, and thus can produce slightly differing
+            // output.
+            //
+            // For example, with a full type check, we may see a type displayed as: number | string
+            // But with a pull type check, we may see it as:                        string | number
+            //
+            // These types are equivalent, but depend on what order the compiler observed
+            // certain parts of the program.
+            var fullWalker = new TypeWriterWalker(program, /*fullTypeCheck*/ true);
+            // Produce baselines.  The first gives the types for all expressions.
+            // The second gives symbols for all identifiers.
+            var typesError, symbolsError;
+            try {
+                checkBaseLines(/*isSymbolBaseLine*/ false);
+            }
+            catch (e) {
+                typesError = e;
+            }
+            try {
+                checkBaseLines(/*isSymbolBaseLine*/ true);
+            }
+            catch (e) {
+                symbolsError = e;
+            }
+            if (typesError && symbolsError) {
+                throw new Error(typesError.stack + Harness.IO.newLine() + symbolsError.stack);
+            }
+            if (typesError) {
+                throw typesError;
+            }
+            if (symbolsError) {
+                throw symbolsError;
+            }
+            return;
+            function checkBaseLines(isSymbolBaseLine) {
+                var fullExtension = isSymbolBaseLine ? ".symbols" : ".types";
+                // When calling this function from rwc-runner, the baselinePath will have no extension.
+                // As rwc test- file is stored in json which ".json" will get stripped off.
+                // When calling this function from compiler-runner, the baselinePath will then has either ".ts" or ".tsx" extension
+                var outputFileName = ts.endsWith(baselinePath, ".ts" /* Ts */) || ts.endsWith(baselinePath, ".tsx" /* Tsx */) ?
+                    baselinePath.replace(/\.tsx?/, "") : baselinePath;
+                if (!multifile) {
+                    var fullBaseLine_1 = generateBaseLine(isSymbolBaseLine, isSymbolBaseLine ? skipSymbolBaselines : skipTypeBaselines);
+                    Baseline.runBaseline(outputFileName + fullExtension, function () { return fullBaseLine_1; }, opts);
+                }
+                else {
+                    Baseline.runMultifileBaseline(outputFileName, fullExtension, function () {
+                        return iterateBaseLine(isSymbolBaseLine, isSymbolBaseLine ? skipSymbolBaselines : skipTypeBaselines);
+                    }, opts);
+                }
+            }
+            function generateBaseLine(isSymbolBaseline, skipBaseline) {
+                var _a;
+                var result = "";
+                var gen = iterateBaseLine(isSymbolBaseline, skipBaseline);
+                for (var _b = gen.next(), done = _b.done, value = _b.value; !done; _a = gen.next(), done = _a.done, value = _a.value, _a) {
+                    var content = value[1];
+                    result += content;
+                }
+                /* tslint:disable:no-null-keyword */
+                return result || null;
+                /* tslint:enable:no-null-keyword */
+            }
+            function iterateBaseLine(isSymbolBaseline, skipBaseline) {
+                var _a, dupeCase, _i, allFiles_1, file, unitName, typeLines, codeLines, gen, lastIndexWritten, _b, done, result, typeOrSymbolString, formattedLine, _c, codeLines_1, codeLine;
+                return __generator(this, function (_d) {
+                    switch (_d.label) {
+                        case 0:
+                            if (skipBaseline) {
+                                return [2 /*return*/];
+                            }
+                            dupeCase = ts.createMap();
+                            _i = 0, allFiles_1 = allFiles;
+                            _d.label = 1;
+                        case 1:
+                            if (!(_i < allFiles_1.length)) return [3 /*break*/, 4];
+                            file = allFiles_1[_i];
+                            unitName = file.unitName;
+                            typeLines = "=== " + unitName + " ===\r\n";
+                            codeLines = ts.flatMap(file.content.split(/\r?\n/g), function (e) { return e.split(/[\r\u2028\u2029]/g); });
+                            gen = isSymbolBaseline ? fullWalker.getSymbols(unitName) : fullWalker.getTypes(unitName);
+                            lastIndexWritten = void 0;
+                            for (_b = gen.next(), done = _b.done, result = _b.value; !done; _a = gen.next(), done = _a.done, result = _a.value, _a) {
+                                if (isSymbolBaseline && !result.symbol) {
+                                    return [2 /*return*/];
+                                }
+                                if (lastIndexWritten === undefined) {
+                                    typeLines += codeLines.slice(0, result.line + 1).join("\r\n") + "\r\n";
+                                }
+                                else if (result.line !== lastIndexWritten) {
+                                    if (!((lastIndexWritten + 1 < codeLines.length) && (codeLines[lastIndexWritten + 1].match(/^\s*[{|}]\s*$/) || codeLines[lastIndexWritten + 1].trim() === ""))) {
+                                        typeLines += "\r\n";
+                                    }
+                                    typeLines += codeLines.slice(lastIndexWritten + 1, result.line + 1).join("\r\n") + "\r\n";
+                                }
+                                lastIndexWritten = result.line;
+                                typeOrSymbolString = isSymbolBaseline ? result.symbol : result.type;
+                                formattedLine = result.sourceText.replace(/\r?\n/g, "") + " : " + typeOrSymbolString;
+                                typeLines += ">" + formattedLine + "\r\n";
+                            }
+                            // Preserve legacy behavior
+                            if (lastIndexWritten === undefined) {
+                                for (_c = 0, codeLines_1 = codeLines; _c < codeLines_1.length; _c++) {
+                                    codeLine = codeLines_1[_c];
+                                    typeLines += codeLine + "\r\nNo type information for this code.";
+                                }
+                            }
+                            else {
+                                if (lastIndexWritten + 1 < codeLines.length) {
+                                    if (!((lastIndexWritten + 1 < codeLines.length) && (codeLines[lastIndexWritten + 1].match(/^\s*[{|}]\s*$/) || codeLines[lastIndexWritten + 1].trim() === ""))) {
+                                        typeLines += "\r\n";
+                                    }
+                                    typeLines += codeLines.slice(lastIndexWritten + 1).join("\r\n");
+                                }
+                                typeLines += "\r\n";
+                            }
+                            return [4 /*yield*/, [checkDuplicatedFileName(unitName, dupeCase), utils.removeTestPathPrefixes(typeLines)]];
+                        case 2:
+                            _d.sent();
+                            _d.label = 3;
+                        case 3:
+                            _i++;
+                            return [3 /*break*/, 1];
+                        case 4: return [2 /*return*/];
+                    }
+                });
+            }
+        }
+        Compiler.doTypeAndSymbolBaseline = doTypeAndSymbolBaseline;
+        function doSourcemapBaseline(baselinePath, options, result, harnessSettings) {
+            var declMaps = ts.getAreDeclarationMapsEnabled(options);
+            if (options.inlineSourceMap) {
+                if (result.maps.size > 0 && !declMaps) {
+                    throw new Error("No sourcemap files should be generated if inlineSourceMaps was set.");
+                }
+                return;
+            }
+            else if (options.sourceMap || declMaps) {
+                if (result.maps.size !== (result.getNumberOfJsFiles() * (declMaps && options.sourceMap ? 2 : 1))) {
+                    throw new Error("Number of sourcemap files should be same as js files.");
+                }
+                Baseline.runBaseline(baselinePath.replace(/\.tsx?/, ".js.map"), function () {
+                    if ((options.noEmitOnError && result.diagnostics.length !== 0) || result.maps.size === 0) {
+                        // We need to return null here or the runBaseLine will actually create a empty file.
+                        // Baselining isn't required here because there is no output.
+                        /* tslint:disable:no-null-keyword */
+                        return null;
+                        /* tslint:enable:no-null-keyword */
+                    }
+                    var sourceMapCode = "";
+                    result.maps.forEach(function (sourceMap) {
+                        sourceMapCode += fileOutput(sourceMap, harnessSettings);
+                    });
+                    return sourceMapCode;
+                });
+            }
+        }
+        Compiler.doSourcemapBaseline = doSourcemapBaseline;
+        function doJsEmitBaseline(baselinePath, header, options, result, tsConfigFiles, toBeCompiled, otherFiles, harnessSettings) {
+            if (!options.noEmit && !options.emitDeclarationOnly && result.js.size === 0 && result.diagnostics.length === 0) {
+                throw new Error("Expected at least one js file to be emitted or at least one error to be created.");
+            }
+            // check js output
+            Baseline.runBaseline(baselinePath.replace(/\.tsx?/, ".js" /* Js */), function () {
+                var tsCode = "";
+                var tsSources = otherFiles.concat(toBeCompiled);
+                if (tsSources.length > 1) {
+                    tsCode += "//// [" + header + "] ////\r\n\r\n";
+                }
+                for (var i = 0; i < tsSources.length; i++) {
+                    tsCode += "//// [" + ts.getBaseFileName(tsSources[i].unitName) + "]\r\n";
+                    tsCode += tsSources[i].content + (i < (tsSources.length - 1) ? "\r\n" : "");
+                }
+                var jsCode = "";
+                result.js.forEach(function (file) {
+                    jsCode += fileOutput(file, harnessSettings);
+                });
+                if (result.dts.size > 0) {
+                    jsCode += "\r\n\r\n";
+                    result.dts.forEach(function (declFile) {
+                        jsCode += fileOutput(declFile, harnessSettings);
+                    });
+                }
+                var declFileContext = prepareDeclarationCompilationContext(toBeCompiled, otherFiles, result, harnessSettings, options, /*currentDirectory*/ undefined);
+                var declFileCompilationResult = compileDeclarationFiles(declFileContext);
+                if (declFileCompilationResult && declFileCompilationResult.declResult.diagnostics.length) {
+                    jsCode += "\r\n\r\n//// [DtsFileErrors]\r\n";
+                    jsCode += "\r\n\r\n";
+                    jsCode += getErrorBaseline(tsConfigFiles.concat(declFileCompilationResult.declInputFiles, declFileCompilationResult.declOtherFiles), declFileCompilationResult.declResult.diagnostics);
+                }
+                if (jsCode.length > 0) {
+                    return tsCode + "\r\n\r\n" + jsCode;
+                }
+                else {
+                    /* tslint:disable:no-null-keyword */
+                    return null;
+                    /* tslint:enable:no-null-keyword */
+                }
+            });
+        }
+        Compiler.doJsEmitBaseline = doJsEmitBaseline;
+        function fileOutput(file, harnessSettings) {
+            var fileName = harnessSettings.fullEmitPaths ? utils.removeTestPathPrefixes(file.file) : ts.getBaseFileName(file.file);
+            return "//// [" + fileName + "]\r\n" + utils.removeTestPathPrefixes(file.text);
+        }
+        function collateOutputs(outputFiles) {
+            var _a;
+            var gen = iterateOutputs(outputFiles);
+            // Emit them
+            var result = "";
+            for (var _b = gen.next(), done = _b.done, value = _b.value; !done; _a = gen.next(), done = _a.done, value = _a.value, _a) {
+                // Some extra spacing if this isn't the first file
+                if (result.length) {
+                    result += "\r\n\r\n";
+                }
+                // FileName header + content
+                var content = value[1];
+                result += content;
+            }
+            return result;
+        }
+        Compiler.collateOutputs = collateOutputs;
+        function iterateOutputs(outputFiles) {
+            function cleanName(fn) {
+                var lastSlash = ts.normalizeSlashes(fn).lastIndexOf("/");
+                return fn.substr(lastSlash + 1).toLowerCase();
+            }
+            var files, dupeCase, _i, files_1, outputFile;
+            return __generator(this, function (_a) {
+                switch (_a.label) {
+                    case 0:
+                        files = Array.from(outputFiles);
+                        files.slice().sort(function (a, b) { return ts.compareStringsCaseSensitive(cleanName(a.file), cleanName(b.file)); });
+                        dupeCase = ts.createMap();
+                        _i = 0, files_1 = files;
+                        _a.label = 1;
+                    case 1:
+                        if (!(_i < files_1.length)) return [3 /*break*/, 4];
+                        outputFile = files_1[_i];
+                        return [4 /*yield*/, [checkDuplicatedFileName(outputFile.file, dupeCase), "/*====== " + outputFile.file + " ======*/\r\n" + utils.removeByteOrderMark(outputFile.text)]];
+                    case 2:
+                        _a.sent();
+                        _a.label = 3;
+                    case 3:
+                        _i++;
+                        return [3 /*break*/, 1];
+                    case 4: return [2 /*return*/];
+                }
+            });
+        }
+        Compiler.iterateOutputs = iterateOutputs;
+        function checkDuplicatedFileName(resultName, dupeCase) {
+            resultName = sanitizeTestFilePath(resultName);
+            if (dupeCase.has(resultName)) {
+                // A different baseline filename should be manufactured if the names differ only in case, for windows compat
+                var count = 1 + dupeCase.get(resultName);
+                dupeCase.set(resultName, count);
+                resultName = resultName + ".dupe" + count;
+            }
+            else {
+                dupeCase.set(resultName, 0);
+            }
+            return resultName;
+        }
+        function sanitizeTestFilePath(name) {
+            var path = ts.toPath(ts.normalizeSlashes(name.replace(/[\^<>:"|?*%]/g, "_")).replace(/\.\.\//g, "__dotdot/"), "", Utils.canonicalizeForHarness);
+            if (ts.startsWith(path, "/")) {
+                return path.substring(1);
+            }
+            return path;
+        }
+        Compiler.sanitizeTestFilePath = sanitizeTestFilePath;
+    })(Compiler = Harness.Compiler || (Harness.Compiler = {}));
+    function splitVaryBySettingValue(text) {
+        if (!text)
+            return undefined;
+        var entries = text.split(/,/).map(function (s) { return s.trim().toLowerCase(); }).filter(function (s) { return s.length > 0; });
+        return entries && entries.length > 1 ? entries : undefined;
+    }
+    function computeFileBasedTestConfigurationVariations(configurations, variationState, varyByEntries, offset) {
+        if (offset >= varyByEntries.length) {
+            // make a copy of the current variation state
+            configurations.push(__assign({}, variationState));
+            return;
+        }
+        var _a = varyByEntries[offset], varyBy = _a[0], entries = _a[1];
+        for (var _i = 0, entries_2 = entries; _i < entries_2.length; _i++) {
+            var entry = entries_2[_i];
+            // set or overwrite the variation, then compute the next variation
+            variationState[varyBy] = entry;
+            computeFileBasedTestConfigurationVariations(configurations, variationState, varyByEntries, offset + 1);
+        }
+    }
+    /**
+     * Compute FileBasedTestConfiguration variations based on a supplied list of variable settings.
+     */
+    function getFileBasedTestConfigurations(settings, varyBy) {
+        var varyByEntries;
+        for (var _i = 0, varyBy_1 = varyBy; _i < varyBy_1.length; _i++) {
+            var varyByKey = varyBy_1[_i];
+            if (ts.hasProperty(settings, varyByKey)) {
+                // we only consider variations when there are 2 or more variable entries.
+                var entries = splitVaryBySettingValue(settings[varyByKey]);
+                if (entries) {
+                    if (!varyByEntries)
+                        varyByEntries = [];
+                    varyByEntries.push([varyByKey, entries]);
+                }
+            }
+        }
+        if (!varyByEntries)
+            return undefined;
+        var configurations = [];
+        computeFileBasedTestConfigurationVariations(configurations, /*variationState*/ {}, varyByEntries, /*offset*/ 0);
+        return configurations;
+    }
+    Harness.getFileBasedTestConfigurations = getFileBasedTestConfigurations;
+    /**
+     * Compute a description for this configuration based on its entries
+     */
+    function getFileBasedTestConfigurationDescription(configuration) {
+        var name = "";
+        if (configuration) {
+            var keys = Object.keys(configuration).sort();
+            for (var _i = 0, keys_1 = keys; _i < keys_1.length; _i++) {
+                var key = keys_1[_i];
+                if (name)
+                    name += ", ";
+                name += "@" + key + ": " + configuration[key];
+            }
+        }
+        return name;
+    }
+    Harness.getFileBasedTestConfigurationDescription = getFileBasedTestConfigurationDescription;
+    var TestCaseParser;
+    (function (TestCaseParser) {
+        // Regex for parsing options in the format "@Alpha: Value of any sort"
+        var optionRegex = /^[\/]{2}\s*@(\w+)\s*:\s*([^\r\n]*)/gm; // multiple matches on multiple lines
+        function extractCompilerSettings(content) {
+            var opts = {};
+            var match;
+            /* tslint:disable:no-null-keyword */
+            while ((match = optionRegex.exec(content)) !== null) {
+                /* tslint:enable:no-null-keyword */
+                opts[match[1]] = match[2].trim();
+            }
+            return opts;
+        }
+        TestCaseParser.extractCompilerSettings = extractCompilerSettings;
+        /** Given a test file containing // @FileName directives, return an array of named units of code to be added to an existing compiler instance */
+        function makeUnitsFromTest(code, fileName, rootDir, settings) {
+            if (settings === void 0) { settings = extractCompilerSettings(code); }
+            // List of all the subfiles we've parsed out
+            var testUnitData = [];
+            var lines = Utils.splitContentByNewlines(code);
+            // Stuff related to the subfile we're parsing
+            var currentFileContent;
+            var currentFileOptions = {};
+            var currentFileName;
+            var refs = [];
+            for (var _i = 0, lines_3 = lines; _i < lines_3.length; _i++) {
+                var line = lines_3[_i];
+                var testMetaData = optionRegex.exec(line);
+                if (testMetaData) {
+                    // Comment line, check for global/file @options and record them
+                    optionRegex.lastIndex = 0;
+                    var metaDataName = testMetaData[1].toLowerCase();
+                    currentFileOptions[testMetaData[1]] = testMetaData[2].trim();
+                    if (metaDataName !== "filename") {
+                        continue;
+                    }
+                    // New metadata statement after having collected some code to go with the previous metadata
+                    if (currentFileName) {
+                        // Store result file
+                        var newTestFile = {
+                            content: currentFileContent,
+                            name: currentFileName,
+                            fileOptions: currentFileOptions,
+                            originalFilePath: fileName,
+                            references: refs
+                        };
+                        testUnitData.push(newTestFile);
+                        // Reset local data
+                        currentFileContent = undefined;
+                        currentFileOptions = {};
+                        currentFileName = testMetaData[2].trim();
+                        refs = [];
+                    }
+                    else {
+                        // First metadata marker in the file
+                        currentFileName = testMetaData[2].trim();
+                    }
+                }
+                else {
+                    // Subfile content line
+                    // Append to the current subfile content, inserting a newline needed
+                    if (currentFileContent === undefined) {
+                        currentFileContent = "";
+                    }
+                    else if (currentFileContent !== "") {
+                        // End-of-line
+                        currentFileContent = currentFileContent + "\n";
+                    }
+                    currentFileContent = currentFileContent + line;
+                }
+            }
+            // normalize the fileName for the single file case
+            currentFileName = testUnitData.length > 0 || currentFileName ? currentFileName : ts.getBaseFileName(fileName);
+            // EOF, push whatever remains
+            var newTestFile2 = {
+                content: currentFileContent || "",
+                name: currentFileName,
+                fileOptions: currentFileOptions,
+                originalFilePath: fileName,
+                references: refs
+            };
+            testUnitData.push(newTestFile2);
+            // unit tests always list files explicitly
+            var parseConfigHost = {
+                useCaseSensitiveFileNames: false,
+                readDirectory: function () { return []; },
+                fileExists: function () { return true; },
+                readFile: function (name) { return ts.forEach(testUnitData, function (data) { return data.name.toLowerCase() === name.toLowerCase() ? data.content : undefined; }); }
+            };
+            // check if project has tsconfig.json in the list of files
+            var tsConfig;
+            var tsConfigFileUnitData;
+            for (var i = 0; i < testUnitData.length; i++) {
+                var data = testUnitData[i];
+                if (getConfigNameFromFileName(data.name)) {
+                    var configJson = ts.parseJsonText(data.name, data.content);
+                    assert.isTrue(configJson.endOfFileToken !== undefined);
+                    var baseDir = ts.normalizePath(ts.getDirectoryPath(data.name));
+                    if (rootDir) {
+                        baseDir = ts.getNormalizedAbsolutePath(baseDir, rootDir);
+                    }
+                    tsConfig = ts.parseJsonSourceFileConfigFileContent(configJson, parseConfigHost, baseDir);
+                    tsConfig.options.configFilePath = data.name;
+                    tsConfigFileUnitData = data;
+                    // delete entry from the list
+                    ts.orderedRemoveItemAt(testUnitData, i);
+                    break;
+                }
+            }
+            return { settings: settings, testUnitData: testUnitData, tsConfig: tsConfig, tsConfigFileUnitData: tsConfigFileUnitData };
+        }
+        TestCaseParser.makeUnitsFromTest = makeUnitsFromTest;
+    })(TestCaseParser = Harness.TestCaseParser || (Harness.TestCaseParser = {}));
+    /** Support class for baseline files */
+    var Baseline;
+    (function (Baseline) {
+        var noContent = "<no content>";
+        function localPath(fileName, baselineFolder, subfolder) {
+            if (baselineFolder === undefined) {
+                return baselinePath(fileName, "local", "tests/baselines", subfolder);
+            }
+            else {
+                return baselinePath(fileName, "local", baselineFolder, subfolder);
+            }
+        }
+        Baseline.localPath = localPath;
+        function referencePath(fileName, baselineFolder, subfolder) {
+            if (baselineFolder === undefined) {
+                return baselinePath(fileName, "reference", "tests/baselines", subfolder);
+            }
+            else {
+                return baselinePath(fileName, "reference", baselineFolder, subfolder);
+            }
+        }
+        function baselinePath(fileName, type, baselineFolder, subfolder) {
+            if (subfolder !== undefined) {
+                return Harness.userSpecifiedRoot + baselineFolder + "/" + subfolder + "/" + type + "/" + fileName;
+            }
+            else {
+                return Harness.userSpecifiedRoot + baselineFolder + "/" + type + "/" + fileName;
+            }
+        }
+        var fileCache = {};
+        function generateActual(generateContent) {
+            var actual = generateContent();
+            if (actual === undefined) {
+                throw new Error("The generated content was \"undefined\". Return \"null\" if no baselining is required.\"");
+            }
+            return actual;
+        }
+        function compareToBaseline(actual, relativeFileName, opts) {
+            // actual is now either undefined (the generator had an error), null (no file requested),
+            // or some real output of the function
+            if (actual === undefined) {
+                // Nothing to do
+                return undefined; // TODO: GH#18217
+            }
+            var refFileName = referencePath(relativeFileName, opts && opts.Baselinefolder, opts && opts.Subfolder);
+            /* tslint:disable:no-null-keyword */
+            if (actual === null) {
+                /* tslint:enable:no-null-keyword */
+                actual = noContent;
+            }
+            var expected = "<no content>";
+            if (Harness.IO.fileExists(refFileName)) {
+                expected = Harness.IO.readFile(refFileName); // TODO: GH#18217
+            }
+            return { expected: expected, actual: actual };
+        }
+        function writeComparison(expected, actual, relativeFileName, actualFileName) {
+            // For now this is written using TypeScript, because sys is not available when running old test cases.
+            // But we need to move to sys once we have
+            // Creates the directory including its parent if not already present
+            function createDirectoryStructure(dirName) {
+                if (fileCache[dirName] || Harness.IO.directoryExists(dirName)) {
+                    fileCache[dirName] = true;
+                    return;
+                }
+                var parentDirectory = Harness.IO.directoryName(dirName); // TODO: GH#18217
+                if (parentDirectory !== "" && parentDirectory !== dirName) {
+                    createDirectoryStructure(parentDirectory);
+                }
+                Harness.IO.createDirectory(dirName);
+                fileCache[dirName] = true;
+            }
+            // Create folders if needed
+            createDirectoryStructure(Harness.IO.directoryName(actualFileName)); // TODO: GH#18217
+            // Delete the actual file in case it fails
+            if (Harness.IO.fileExists(actualFileName)) {
+                Harness.IO.deleteFile(actualFileName);
+            }
+            var encodedActual = Utils.encodeString(actual);
+            if (expected !== encodedActual) {
+                if (actual === noContent) {
+                    Harness.IO.writeFile(actualFileName + ".delete", "");
+                }
+                else {
+                    Harness.IO.writeFile(actualFileName, encodedActual);
+                }
+                throw new Error("The baseline file " + relativeFileName + " has changed.");
+            }
+        }
+        function runBaseline(relativeFileName, generateContent, opts) {
+            var actualFileName = localPath(relativeFileName, opts && opts.Baselinefolder, opts && opts.Subfolder);
+            var actual = generateActual(generateContent);
+            var comparison = compareToBaseline(actual, relativeFileName, opts);
+            writeComparison(comparison.expected, comparison.actual, relativeFileName, actualFileName);
+        }
+        Baseline.runBaseline = runBaseline;
+        function runMultifileBaseline(relativeFileBase, extension, generateContent, opts, referencedExtensions) {
+            var _a;
+            var gen = generateContent();
+            var writtenFiles = ts.createMap();
+            var errors = [];
+            // tslint:disable-next-line:no-null-keyword
+            if (gen !== null) {
+                for (var _b = gen.next(), done = _b.done, value = _b.value; !done; _a = gen.next(), done = _a.done, value = _a.value, _a) {
+                    var _c = value, name = _c[0], content = _c[1], count = _c[2];
+                    if (count === 0)
+                        continue; // Allow error reporter to skip writing files without errors
+                    var relativeFileName = relativeFileBase + "/" + name + extension;
+                    var actualFileName = localPath(relativeFileName, opts && opts.Baselinefolder, opts && opts.Subfolder);
+                    var comparison = compareToBaseline(content, relativeFileName, opts);
+                    try {
+                        writeComparison(comparison.expected, comparison.actual, relativeFileName, actualFileName);
+                    }
+                    catch (e) {
+                        errors.push(e);
+                    }
+                    writtenFiles.set(relativeFileName, true);
+                }
+            }
+            var referenceDir = referencePath(relativeFileBase, opts && opts.Baselinefolder, opts && opts.Subfolder);
+            var existing = Harness.IO.readDirectory(referenceDir, referencedExtensions || [extension]);
+            if (extension === ".ts" || referencedExtensions && referencedExtensions.indexOf(".ts") > -1 && referencedExtensions.indexOf(".d.ts") === -1) {
+                // special-case and filter .d.ts out of .ts results
+                existing = existing.filter(function (f) { return !ts.endsWith(f, ".d.ts"); });
+            }
+            var missing = [];
+            for (var _i = 0, existing_1 = existing; _i < existing_1.length; _i++) {
+                var name = existing_1[_i];
+                var localCopy = name.substring(referenceDir.length - relativeFileBase.length);
+                if (!writtenFiles.has(localCopy)) {
+                    missing.push(localCopy);
+                }
+            }
+            if (missing.length) {
+                for (var _d = 0, missing_1 = missing; _d < missing_1.length; _d++) {
+                    var file = missing_1[_d];
+                    Harness.IO.writeFile(localPath(file + ".delete", opts && opts.Baselinefolder, opts && opts.Subfolder), "");
+                }
+            }
+            if (errors.length || missing.length) {
+                var errorMsg = "";
+                if (errors.length) {
+                    errorMsg += "The baseline for " + relativeFileBase + " in " + errors.length + " files has changed:" + ("\n    " + errors.slice(0, 5).map(function (e) { return e.message; }).join("\n    ") + (errors.length > 5 ? "\n" + ("    and " + (errors.length - 5) + " more") : ""));
+                }
+                if (errors.length && missing.length) {
+                    errorMsg += "\n";
+                }
+                if (missing.length) {
+                    var writtenFilesArray = ts.arrayFrom(writtenFiles.keys());
+                    errorMsg += "Baseline missing " + missing.length + " files:" + ("\n    " + missing.slice(0, 5).join("\n    ") + (missing.length > 5 ? "\n" + ("    and " + (missing.length - 5) + " more") : "") + "\n") + "Written " + writtenFiles.size + " files:" + ("\n    " + writtenFilesArray.slice(0, 5).join("\n    ") + (writtenFilesArray.length > 5 ? "\n" + ("    and " + (writtenFilesArray.length - 5) + " more") : ""));
+                }
+                throw new Error(errorMsg);
+            }
+        }
+        Baseline.runMultifileBaseline = runMultifileBaseline;
+    })(Baseline = Harness.Baseline || (Harness.Baseline = {}));
+    function isDefaultLibraryFile(filePath) {
+        // We need to make sure that the filePath is prefixed with "lib." not just containing "lib." and end with ".d.ts"
+        var fileName = ts.getBaseFileName(ts.normalizeSlashes(filePath));
+        return ts.startsWith(fileName, "lib.") && ts.endsWith(fileName, ".d.ts" /* Dts */);
+    }
+    Harness.isDefaultLibraryFile = isDefaultLibraryFile;
+    function isBuiltFile(filePath) {
+        return filePath.indexOf(Harness.libFolder) === 0 ||
+            filePath.indexOf(vpath.addTrailingSeparator(vfs.builtFolder)) === 0;
+    }
+    Harness.isBuiltFile = isBuiltFile;
+    function getDefaultLibraryFile(filePath, io) {
+        var libFile = Harness.userSpecifiedRoot + Harness.libFolder + ts.getBaseFileName(ts.normalizeSlashes(filePath));
+        return { unitName: libFile, content: io.readFile(libFile) };
+    }
+    Harness.getDefaultLibraryFile = getDefaultLibraryFile;
+    function getConfigNameFromFileName(filename) {
+        var flc = ts.getBaseFileName(filename).toLowerCase();
+        return ts.find(["tsconfig.json", "jsconfig.json"], function (x) { return x === flc; });
+    }
+    Harness.getConfigNameFromFileName = getConfigNameFromFileName;
+    if (Error)
+        Error.stackTraceLimit = 100;
+})(Harness || (Harness = {}));
+var Harness;
+(function (Harness) {
+    var LanguageService;
+    (function (LanguageService) {
+        var ScriptInfo = /** @class */ (function () {
+            function ScriptInfo(fileName, content, isRootFile) {
+                this.fileName = fileName;
+                this.content = content;
+                this.isRootFile = isRootFile;
+                this.version = 1;
+                this.editRanges = [];
+                this.setContent(content);
+            }
+            ScriptInfo.prototype.setContent = function (content) {
+                this.content = content;
+                this.lineMap = undefined;
+            };
+            ScriptInfo.prototype.getLineMap = function () {
+                return this.lineMap || (this.lineMap = ts.computeLineStarts(this.content));
+            };
+            ScriptInfo.prototype.updateContent = function (content) {
+                this.editRanges = [];
+                this.setContent(content);
+                this.version++;
+            };
+            ScriptInfo.prototype.editContent = function (start, end, newText) {
+                // Apply edits
+                var prefix = this.content.substring(0, start);
+                var middle = newText;
+                var suffix = this.content.substring(end);
+                this.setContent(prefix + middle + suffix);
+                // Store edit range + new length of script
+                this.editRanges.push({
+                    length: this.content.length,
+                    textChangeRange: ts.createTextChangeRange(ts.createTextSpanFromBounds(start, end), newText.length)
+                });
+                // Update version #
+                this.version++;
+            };
+            ScriptInfo.prototype.getTextChangeRangeBetweenVersions = function (startVersion, endVersion) {
+                if (startVersion === endVersion) {
+                    // No edits!
+                    return ts.unchangedTextChangeRange;
+                }
+                var initialEditRangeIndex = this.editRanges.length - (this.version - startVersion);
+                var lastEditRangeIndex = this.editRanges.length - (this.version - endVersion);
+                var entries = this.editRanges.slice(initialEditRangeIndex, lastEditRangeIndex);
+                return ts.collapseTextChangeRangesAcrossMultipleVersions(entries.map(function (e) { return e.textChangeRange; }));
+            };
+            return ScriptInfo;
+        }());
+        LanguageService.ScriptInfo = ScriptInfo;
+        var ScriptSnapshot = /** @class */ (function () {
+            function ScriptSnapshot(scriptInfo) {
+                this.scriptInfo = scriptInfo;
+                this.textSnapshot = scriptInfo.content;
+                this.version = scriptInfo.version;
+            }
+            ScriptSnapshot.prototype.getText = function (start, end) {
+                return this.textSnapshot.substring(start, end);
+            };
+            ScriptSnapshot.prototype.getLength = function () {
+                return this.textSnapshot.length;
+            };
+            ScriptSnapshot.prototype.getChangeRange = function (oldScript) {
+                var oldShim = oldScript;
+                return this.scriptInfo.getTextChangeRangeBetweenVersions(oldShim.version, this.version);
+            };
+            return ScriptSnapshot;
+        }());
+        var ScriptSnapshotProxy = /** @class */ (function () {
+            function ScriptSnapshotProxy(scriptSnapshot) {
+                this.scriptSnapshot = scriptSnapshot;
+            }
+            ScriptSnapshotProxy.prototype.getText = function (start, end) {
+                return this.scriptSnapshot.getText(start, end);
+            };
+            ScriptSnapshotProxy.prototype.getLength = function () {
+                return this.scriptSnapshot.getLength();
+            };
+            ScriptSnapshotProxy.prototype.getChangeRange = function (oldScript) {
+                var range = this.scriptSnapshot.getChangeRange(oldScript.scriptSnapshot);
+                return range && JSON.stringify(range);
+            };
+            return ScriptSnapshotProxy;
+        }());
+        var DefaultHostCancellationToken = /** @class */ (function () {
+            function DefaultHostCancellationToken() {
+            }
+            DefaultHostCancellationToken.prototype.isCancellationRequested = function () {
+                return false;
+            };
+            DefaultHostCancellationToken.instance = new DefaultHostCancellationToken();
+            return DefaultHostCancellationToken;
+        }());
+        var LanguageServiceAdapterHost = /** @class */ (function () {
+            function LanguageServiceAdapterHost(cancellationToken, settings) {
+                if (cancellationToken === void 0) { cancellationToken = DefaultHostCancellationToken.instance; }
+                if (settings === void 0) { settings = ts.getDefaultCompilerOptions(); }
+                this.cancellationToken = cancellationToken;
+                this.settings = settings;
+                this.sys = new fakes.System(new vfs.FileSystem(/*ignoreCase*/ true, { cwd: Harness.virtualFileSystemRoot }));
+                this.scriptInfos = new collections.SortedMap({ comparer: this.vfs.stringComparer, sort: "insertion" });
+            }
+            Object.defineProperty(LanguageServiceAdapterHost.prototype, "vfs", {
+                get: function () {
+                    return this.sys.vfs;
+                },
+                enumerable: true,
+                configurable: true
+            });
+            LanguageServiceAdapterHost.prototype.getNewLine = function () {
+                return Harness.harnessNewLine;
+            };
+            LanguageServiceAdapterHost.prototype.getFilenames = function () {
+                var fileNames = [];
+                this.scriptInfos.forEach(function (scriptInfo) {
+                    if (scriptInfo.isRootFile) {
+                        // only include root files here
+                        // usually it means that we won't include lib.d.ts in the list of root files so it won't mess the computation of compilation root dir.
+                        fileNames.push(scriptInfo.fileName);
+                    }
+                });
+                return fileNames;
+            };
+            LanguageServiceAdapterHost.prototype.getScriptInfo = function (fileName) {
+                return this.scriptInfos.get(vpath.resolve(this.vfs.cwd(), fileName));
+            };
+            LanguageServiceAdapterHost.prototype.addScript = function (fileName, content, isRootFile) {
+                this.vfs.mkdirpSync(vpath.dirname(fileName));
+                this.vfs.writeFileSync(fileName, content);
+                this.scriptInfos.set(vpath.resolve(this.vfs.cwd(), fileName), new ScriptInfo(fileName, content, isRootFile));
+            };
+            LanguageServiceAdapterHost.prototype.editScript = function (fileName, start, end, newText) {
+                var script = this.getScriptInfo(fileName);
+                if (script) {
+                    script.editContent(start, end, newText);
+                    this.vfs.mkdirpSync(vpath.dirname(fileName));
+                    this.vfs.writeFileSync(fileName, script.content);
+                    return;
+                }
+                throw new Error("No script with name '" + fileName + "'");
+            };
+            LanguageServiceAdapterHost.prototype.openFile = function (_fileName, _content, _scriptKindName) { };
+            /**
+             * @param line 0 based index
+             * @param col 0 based index
+             */
+            LanguageServiceAdapterHost.prototype.positionToLineAndCharacter = function (fileName, position) {
+                var script = this.getScriptInfo(fileName);
+                assert.isOk(script);
+                return ts.computeLineAndCharacterOfPosition(script.getLineMap(), position);
+            };
+            return LanguageServiceAdapterHost;
+        }());
+        LanguageService.LanguageServiceAdapterHost = LanguageServiceAdapterHost;
+        /// Native adapter
+        var NativeLanguageServiceHost = /** @class */ (function (_super) {
+            __extends(NativeLanguageServiceHost, _super);
+            function NativeLanguageServiceHost() {
+                var _this = _super !== null && _super.apply(this, arguments) || this;
+                _this.installPackage = ts.notImplemented;
+                _this.log = ts.noop;
+                _this.trace = ts.noop;
+                _this.error = ts.noop;
+                return _this;
+            }
+            NativeLanguageServiceHost.prototype.isKnownTypesPackageName = function (name) {
+                return !!this.typesRegistry && this.typesRegistry.has(name);
+            };
+            NativeLanguageServiceHost.prototype.getCompilationSettings = function () { return this.settings; };
+            NativeLanguageServiceHost.prototype.getCancellationToken = function () { return this.cancellationToken; };
+            NativeLanguageServiceHost.prototype.getDirectories = function (path) {
+                return this.sys.getDirectories(path);
+            };
+            NativeLanguageServiceHost.prototype.getCurrentDirectory = function () { return Harness.virtualFileSystemRoot; };
+            NativeLanguageServiceHost.prototype.getDefaultLibFileName = function () { return Harness.Compiler.defaultLibFileName; };
+            NativeLanguageServiceHost.prototype.getScriptFileNames = function () {
+                return this.getFilenames().filter(ts.isAnySupportedFileExtension);
+            };
+            NativeLanguageServiceHost.prototype.getScriptSnapshot = function (fileName) {
+                var script = this.getScriptInfo(fileName);
+                return script ? new ScriptSnapshot(script) : undefined;
+            };
+            NativeLanguageServiceHost.prototype.getScriptKind = function () { return 0 /* Unknown */; };
+            NativeLanguageServiceHost.prototype.getScriptVersion = function (fileName) {
+                var script = this.getScriptInfo(fileName);
+                return script ? script.version.toString() : undefined; // TODO: GH#18217
+            };
+            NativeLanguageServiceHost.prototype.directoryExists = function (dirName) {
+                return this.sys.directoryExists(dirName);
+            };
+            NativeLanguageServiceHost.prototype.fileExists = function (fileName) {
+                return this.sys.fileExists(fileName);
+            };
+            NativeLanguageServiceHost.prototype.readDirectory = function (path, extensions, exclude, include, depth) {
+                return this.sys.readDirectory(path, extensions, exclude, include, depth);
+            };
+            NativeLanguageServiceHost.prototype.readFile = function (path) {
+                return this.sys.readFile(path);
+            };
+            NativeLanguageServiceHost.prototype.realpath = function (path) {
+                return this.sys.realpath(path);
+            };
+            NativeLanguageServiceHost.prototype.getTypeRootsVersion = function () {
+                return 0;
+            };
+            return NativeLanguageServiceHost;
+        }(LanguageServiceAdapterHost));
+        var NativeLanguageServiceAdapter = /** @class */ (function () {
+            function NativeLanguageServiceAdapter(cancellationToken, options) {
+                this.host = new NativeLanguageServiceHost(cancellationToken, options);
+            }
+            NativeLanguageServiceAdapter.prototype.getHost = function () { return this.host; };
+            NativeLanguageServiceAdapter.prototype.getLanguageService = function () { return ts.createLanguageService(this.host); };
+            NativeLanguageServiceAdapter.prototype.getClassifier = function () { return ts.createClassifier(); };
+            NativeLanguageServiceAdapter.prototype.getPreProcessedFileInfo = function (fileName, fileContents) { return ts.preProcessFile(fileContents, /* readImportFiles */ true, ts.hasJavaScriptFileExtension(fileName)); };
+            return NativeLanguageServiceAdapter;
+        }());
+        LanguageService.NativeLanguageServiceAdapter = NativeLanguageServiceAdapter;
+        /// Shim adapter
+        var ShimLanguageServiceHost = /** @class */ (function (_super) {
+            __extends(ShimLanguageServiceHost, _super);
+            function ShimLanguageServiceHost(preprocessToResolve, cancellationToken, options) {
+                var _this = _super.call(this, cancellationToken, options) || this;
+                _this.readDirectory = ts.notImplemented;
+                _this.readDirectoryNames = ts.notImplemented;
+                _this.readFileNames = ts.notImplemented;
+                _this.nativeHost = new NativeLanguageServiceHost(cancellationToken, options);
+                if (preprocessToResolve) {
+                    var compilerOptions_1 = _this.nativeHost.getCompilationSettings();
+                    var moduleResolutionHost_1 = {
+                        fileExists: function (fileName) { return _this.getScriptInfo(fileName) !== undefined; },
+                        readFile: function (fileName) {
+                            var scriptInfo = _this.getScriptInfo(fileName);
+                            return scriptInfo && scriptInfo.content;
+                        }
+                    };
+                    _this.getModuleResolutionsForFile = function (fileName) {
+                        var scriptInfo = _this.getScriptInfo(fileName);
+                        var preprocessInfo = ts.preProcessFile(scriptInfo.content, /*readImportFiles*/ true);
+                        var imports = {};
+                        for (var _i = 0, _a = preprocessInfo.importedFiles; _i < _a.length; _i++) {
+                            var module_1 = _a[_i];
+                            var resolutionInfo = ts.resolveModuleName(module_1.fileName, fileName, compilerOptions_1, moduleResolutionHost_1);
+                            if (resolutionInfo.resolvedModule) {
+                                imports[module_1.fileName] = resolutionInfo.resolvedModule.resolvedFileName;
+                            }
+                        }
+                        return JSON.stringify(imports);
+                    };
+                    _this.getTypeReferenceDirectiveResolutionsForFile = function (fileName) {
+                        var scriptInfo = _this.getScriptInfo(fileName);
+                        if (scriptInfo) {
+                            var preprocessInfo = ts.preProcessFile(scriptInfo.content, /*readImportFiles*/ false);
+                            var resolutions = {};
+                            var settings = _this.nativeHost.getCompilationSettings();
+                            for (var _i = 0, _a = preprocessInfo.typeReferenceDirectives; _i < _a.length; _i++) {
+                                var typeReferenceDirective = _a[_i];
+                                var resolutionInfo = ts.resolveTypeReferenceDirective(typeReferenceDirective.fileName, fileName, settings, moduleResolutionHost_1);
+                                if (resolutionInfo.resolvedTypeReferenceDirective.resolvedFileName) {
+                                    resolutions[typeReferenceDirective.fileName] = resolutionInfo.resolvedTypeReferenceDirective;
+                                }
+                            }
+                            return JSON.stringify(resolutions);
+                        }
+                        else {
+                            return "[]";
+                        }
+                    };
+                }
+                return _this;
+            }
+            ShimLanguageServiceHost.prototype.getFilenames = function () { return this.nativeHost.getFilenames(); };
+            ShimLanguageServiceHost.prototype.getScriptInfo = function (fileName) { return this.nativeHost.getScriptInfo(fileName); };
+            ShimLanguageServiceHost.prototype.addScript = function (fileName, content, isRootFile) { this.nativeHost.addScript(fileName, content, isRootFile); };
+            ShimLanguageServiceHost.prototype.editScript = function (fileName, start, end, newText) { this.nativeHost.editScript(fileName, start, end, newText); };
+            ShimLanguageServiceHost.prototype.positionToLineAndCharacter = function (fileName, position) { return this.nativeHost.positionToLineAndCharacter(fileName, position); };
+            ShimLanguageServiceHost.prototype.getCompilationSettings = function () { return JSON.stringify(this.nativeHost.getCompilationSettings()); };
+            ShimLanguageServiceHost.prototype.getCancellationToken = function () { return this.nativeHost.getCancellationToken(); };
+            ShimLanguageServiceHost.prototype.getCurrentDirectory = function () { return this.nativeHost.getCurrentDirectory(); };
+            ShimLanguageServiceHost.prototype.getDirectories = function (path) { return JSON.stringify(this.nativeHost.getDirectories(path)); };
+            ShimLanguageServiceHost.prototype.getDefaultLibFileName = function () { return this.nativeHost.getDefaultLibFileName(); };
+            ShimLanguageServiceHost.prototype.getScriptFileNames = function () { return JSON.stringify(this.nativeHost.getScriptFileNames()); };
+            ShimLanguageServiceHost.prototype.getScriptSnapshot = function (fileName) {
+                var nativeScriptSnapshot = this.nativeHost.getScriptSnapshot(fileName); // TODO: GH#18217
+                return nativeScriptSnapshot && new ScriptSnapshotProxy(nativeScriptSnapshot);
+            };
+            ShimLanguageServiceHost.prototype.getScriptKind = function () { return this.nativeHost.getScriptKind(); };
+            ShimLanguageServiceHost.prototype.getScriptVersion = function (fileName) { return this.nativeHost.getScriptVersion(fileName); };
+            ShimLanguageServiceHost.prototype.getLocalizedDiagnosticMessages = function () { return JSON.stringify({}); };
+            ShimLanguageServiceHost.prototype.fileExists = function (fileName) { return this.getScriptInfo(fileName) !== undefined; };
+            ShimLanguageServiceHost.prototype.readFile = function (fileName) {
+                var snapshot = this.nativeHost.getScriptSnapshot(fileName);
+                return snapshot && ts.getSnapshotText(snapshot);
+            };
+            ShimLanguageServiceHost.prototype.log = function (s) { this.nativeHost.log(s); };
+            ShimLanguageServiceHost.prototype.trace = function (s) { this.nativeHost.trace(s); };
+            ShimLanguageServiceHost.prototype.error = function (s) { this.nativeHost.error(s); };
+            ShimLanguageServiceHost.prototype.directoryExists = function () {
+                // for tests pessimistically assume that directory always exists
+                return true;
+            };
+            return ShimLanguageServiceHost;
+        }(LanguageServiceAdapterHost));
+        var ClassifierShimProxy = /** @class */ (function () {
+            function ClassifierShimProxy(shim) {
+                this.shim = shim;
+            }
+            ClassifierShimProxy.prototype.getEncodedLexicalClassifications = function (_text, _lexState, _classifyKeywordsInGenerics) {
+                return ts.notImplemented();
+            };
+            ClassifierShimProxy.prototype.getClassificationsForLine = function (text, lexState, classifyKeywordsInGenerics) {
+                var result = this.shim.getClassificationsForLine(text, lexState, classifyKeywordsInGenerics).split("\n");
+                var entries = [];
+                var i = 0;
+                var position = 0;
+                for (; i < result.length - 1; i += 2) {
+                    var t = entries[i / 2] = {
+                        length: parseInt(result[i]),
+                        classification: parseInt(result[i + 1])
+                    };
+                    assert.isTrue(t.length > 0, "Result length should be greater than 0, got :" + t.length);
+                    position += t.length;
+                }
+                var finalLexState = parseInt(result[result.length - 1]);
+                assert.equal(position, text.length, "Expected cumulative length of all entries to match the length of the source. expected: " + text.length + ", but got: " + position);
+                return {
+                    finalLexState: finalLexState,
+                    entries: entries
+                };
+            };
+            return ClassifierShimProxy;
+        }());
+        function unwrapJSONCallResult(result) {
+            var parsedResult = JSON.parse(result);
+            if (parsedResult.error) {
+                throw new Error("Language Service Shim Error: " + JSON.stringify(parsedResult.error));
+            }
+            else if (parsedResult.canceled) {
+                throw new ts.OperationCanceledException();
+            }
+            return parsedResult.result;
+        }
+        var LanguageServiceShimProxy = /** @class */ (function () {
+            function LanguageServiceShimProxy(shim) {
+                this.shim = shim;
+                this.getCombinedCodeFix = ts.notImplemented;
+                this.applyCodeActionCommand = ts.notImplemented;
+            }
+            LanguageServiceShimProxy.prototype.cleanupSemanticCache = function () {
+                this.shim.cleanupSemanticCache();
+            };
+            LanguageServiceShimProxy.prototype.getSyntacticDiagnostics = function (fileName) {
+                return unwrapJSONCallResult(this.shim.getSyntacticDiagnostics(fileName));
+            };
+            LanguageServiceShimProxy.prototype.getSemanticDiagnostics = function (fileName) {
+                return unwrapJSONCallResult(this.shim.getSemanticDiagnostics(fileName));
+            };
+            LanguageServiceShimProxy.prototype.getSuggestionDiagnostics = function (fileName) {
+                return unwrapJSONCallResult(this.shim.getSuggestionDiagnostics(fileName));
+            };
+            LanguageServiceShimProxy.prototype.getCompilerOptionsDiagnostics = function () {
+                return unwrapJSONCallResult(this.shim.getCompilerOptionsDiagnostics());
+            };
+            LanguageServiceShimProxy.prototype.getSyntacticClassifications = function (fileName, span) {
+                return unwrapJSONCallResult(this.shim.getSyntacticClassifications(fileName, span.start, span.length));
+            };
+            LanguageServiceShimProxy.prototype.getSemanticClassifications = function (fileName, span) {
+                return unwrapJSONCallResult(this.shim.getSemanticClassifications(fileName, span.start, span.length));
+            };
+            LanguageServiceShimProxy.prototype.getEncodedSyntacticClassifications = function (fileName, span) {
+                return unwrapJSONCallResult(this.shim.getEncodedSyntacticClassifications(fileName, span.start, span.length));
+            };
+            LanguageServiceShimProxy.prototype.getEncodedSemanticClassifications = function (fileName, span) {
+                return unwrapJSONCallResult(this.shim.getEncodedSemanticClassifications(fileName, span.start, span.length));
+            };
+            LanguageServiceShimProxy.prototype.getCompletionsAtPosition = function (fileName, position, preferences) {
+                return unwrapJSONCallResult(this.shim.getCompletionsAtPosition(fileName, position, preferences));
+            };
+            LanguageServiceShimProxy.prototype.getCompletionEntryDetails = function (fileName, position, entryName, formatOptions, source, preferences) {
+                return unwrapJSONCallResult(this.shim.getCompletionEntryDetails(fileName, position, entryName, JSON.stringify(formatOptions), source, preferences));
+            };
+            LanguageServiceShimProxy.prototype.getCompletionEntrySymbol = function () {
+                throw new Error("getCompletionEntrySymbol not implemented across the shim layer.");
+            };
+            LanguageServiceShimProxy.prototype.getQuickInfoAtPosition = function (fileName, position) {
+                return unwrapJSONCallResult(this.shim.getQuickInfoAtPosition(fileName, position));
+            };
+            LanguageServiceShimProxy.prototype.getNameOrDottedNameSpan = function (fileName, startPos, endPos) {
+                return unwrapJSONCallResult(this.shim.getNameOrDottedNameSpan(fileName, startPos, endPos));
+            };
+            LanguageServiceShimProxy.prototype.getBreakpointStatementAtPosition = function (fileName, position) {
+                return unwrapJSONCallResult(this.shim.getBreakpointStatementAtPosition(fileName, position));
+            };
+            LanguageServiceShimProxy.prototype.getSignatureHelpItems = function (fileName, position) {
+                return unwrapJSONCallResult(this.shim.getSignatureHelpItems(fileName, position));
+            };
+            LanguageServiceShimProxy.prototype.getRenameInfo = function (fileName, position) {
+                return unwrapJSONCallResult(this.shim.getRenameInfo(fileName, position));
+            };
+            LanguageServiceShimProxy.prototype.findRenameLocations = function (fileName, position, findInStrings, findInComments) {
+                return unwrapJSONCallResult(this.shim.findRenameLocations(fileName, position, findInStrings, findInComments));
+            };
+            LanguageServiceShimProxy.prototype.getDefinitionAtPosition = function (fileName, position) {
+                return unwrapJSONCallResult(this.shim.getDefinitionAtPosition(fileName, position));
+            };
+            LanguageServiceShimProxy.prototype.getDefinitionAndBoundSpan = function (fileName, position) {
+                return unwrapJSONCallResult(this.shim.getDefinitionAndBoundSpan(fileName, position));
+            };
+            LanguageServiceShimProxy.prototype.getTypeDefinitionAtPosition = function (fileName, position) {
+                return unwrapJSONCallResult(this.shim.getTypeDefinitionAtPosition(fileName, position));
+            };
+            LanguageServiceShimProxy.prototype.getImplementationAtPosition = function (fileName, position) {
+                return unwrapJSONCallResult(this.shim.getImplementationAtPosition(fileName, position));
+            };
+            LanguageServiceShimProxy.prototype.getReferencesAtPosition = function (fileName, position) {
+                return unwrapJSONCallResult(this.shim.getReferencesAtPosition(fileName, position));
+            };
+            LanguageServiceShimProxy.prototype.findReferences = function (fileName, position) {
+                return unwrapJSONCallResult(this.shim.findReferences(fileName, position));
+            };
+            LanguageServiceShimProxy.prototype.getOccurrencesAtPosition = function (fileName, position) {
+                return unwrapJSONCallResult(this.shim.getOccurrencesAtPosition(fileName, position));
+            };
+            LanguageServiceShimProxy.prototype.getDocumentHighlights = function (fileName, position, filesToSearch) {
+                return unwrapJSONCallResult(this.shim.getDocumentHighlights(fileName, position, JSON.stringify(filesToSearch)));
+            };
+            LanguageServiceShimProxy.prototype.getNavigateToItems = function (searchValue) {
+                return unwrapJSONCallResult(this.shim.getNavigateToItems(searchValue));
+            };
+            LanguageServiceShimProxy.prototype.getNavigationBarItems = function (fileName) {
+                return unwrapJSONCallResult(this.shim.getNavigationBarItems(fileName));
+            };
+            LanguageServiceShimProxy.prototype.getNavigationTree = function (fileName) {
+                return unwrapJSONCallResult(this.shim.getNavigationTree(fileName));
+            };
+            LanguageServiceShimProxy.prototype.getOutliningSpans = function (fileName) {
+                return unwrapJSONCallResult(this.shim.getOutliningSpans(fileName));
+            };
+            LanguageServiceShimProxy.prototype.getTodoComments = function (fileName, descriptors) {
+                return unwrapJSONCallResult(this.shim.getTodoComments(fileName, JSON.stringify(descriptors)));
+            };
+            LanguageServiceShimProxy.prototype.getBraceMatchingAtPosition = function (fileName, position) {
+                return unwrapJSONCallResult(this.shim.getBraceMatchingAtPosition(fileName, position));
+            };
+            LanguageServiceShimProxy.prototype.getIndentationAtPosition = function (fileName, position, options) {
+                return unwrapJSONCallResult(this.shim.getIndentationAtPosition(fileName, position, JSON.stringify(options)));
+            };
+            LanguageServiceShimProxy.prototype.getFormattingEditsForRange = function (fileName, start, end, options) {
+                return unwrapJSONCallResult(this.shim.getFormattingEditsForRange(fileName, start, end, JSON.stringify(options)));
+            };
+            LanguageServiceShimProxy.prototype.getFormattingEditsForDocument = function (fileName, options) {
+                return unwrapJSONCallResult(this.shim.getFormattingEditsForDocument(fileName, JSON.stringify(options)));
+            };
+            LanguageServiceShimProxy.prototype.getFormattingEditsAfterKeystroke = function (fileName, position, key, options) {
+                return unwrapJSONCallResult(this.shim.getFormattingEditsAfterKeystroke(fileName, position, key, JSON.stringify(options)));
+            };
+            LanguageServiceShimProxy.prototype.getDocCommentTemplateAtPosition = function (fileName, position) {
+                return unwrapJSONCallResult(this.shim.getDocCommentTemplateAtPosition(fileName, position));
+            };
+            LanguageServiceShimProxy.prototype.isValidBraceCompletionAtPosition = function (fileName, position, openingBrace) {
+                return unwrapJSONCallResult(this.shim.isValidBraceCompletionAtPosition(fileName, position, openingBrace));
+            };
+            LanguageServiceShimProxy.prototype.getJsxClosingTagAtPosition = function () {
+                throw new Error("Not supported on the shim.");
+            };
+            LanguageServiceShimProxy.prototype.getSpanOfEnclosingComment = function (fileName, position, onlyMultiLine) {
+                return unwrapJSONCallResult(this.shim.getSpanOfEnclosingComment(fileName, position, onlyMultiLine));
+            };
+            LanguageServiceShimProxy.prototype.getCodeFixesAtPosition = function () {
+                throw new Error("Not supported on the shim.");
+            };
+            LanguageServiceShimProxy.prototype.getCodeFixDiagnostics = function () {
+                throw new Error("Not supported on the shim.");
+            };
+            LanguageServiceShimProxy.prototype.getEditsForRefactor = function () {
+                throw new Error("Not supported on the shim.");
+            };
+            LanguageServiceShimProxy.prototype.getApplicableRefactors = function () {
+                throw new Error("Not supported on the shim.");
+            };
+            LanguageServiceShimProxy.prototype.organizeImports = function (_scope, _formatOptions) {
+                throw new Error("Not supported on the shim.");
+            };
+            LanguageServiceShimProxy.prototype.getEditsForFileRename = function () {
+                throw new Error("Not supported on the shim.");
+            };
+            LanguageServiceShimProxy.prototype.getEmitOutput = function (fileName) {
+                return unwrapJSONCallResult(this.shim.getEmitOutput(fileName));
+            };
+            LanguageServiceShimProxy.prototype.getProgram = function () {
+                throw new Error("Program can not be marshaled across the shim layer.");
+            };
+            LanguageServiceShimProxy.prototype.getNonBoundSourceFile = function () {
+                throw new Error("SourceFile can not be marshaled across the shim layer.");
+            };
+            LanguageServiceShimProxy.prototype.getSourceFile = function () {
+                throw new Error("SourceFile can not be marshaled across the shim layer.");
+            };
+            LanguageServiceShimProxy.prototype.dispose = function () { this.shim.dispose({}); };
+            return LanguageServiceShimProxy;
+        }());
+        var ShimLanguageServiceAdapter = /** @class */ (function () {
+            function ShimLanguageServiceAdapter(preprocessToResolve, cancellationToken, options) {
+                this.host = new ShimLanguageServiceHost(preprocessToResolve, cancellationToken, options);
+                this.factory = new TypeScript.Services.TypeScriptServicesFactory();
+            }
+            ShimLanguageServiceAdapter.prototype.getHost = function () { return this.host; };
+            ShimLanguageServiceAdapter.prototype.getLanguageService = function () { return new LanguageServiceShimProxy(this.factory.createLanguageServiceShim(this.host)); };
+            ShimLanguageServiceAdapter.prototype.getClassifier = function () { return new ClassifierShimProxy(this.factory.createClassifierShim(this.host)); };
+            ShimLanguageServiceAdapter.prototype.getPreProcessedFileInfo = function (fileName, fileContents) {
+                var shimResult;
+                var coreServicesShim = this.factory.createCoreServicesShim(this.host);
+                shimResult = unwrapJSONCallResult(coreServicesShim.getPreProcessedFileInfo(fileName, ts.ScriptSnapshot.fromString(fileContents)));
+                var convertResult = {
+                    referencedFiles: [],
+                    importedFiles: [],
+                    ambientExternalModules: [],
+                    isLibFile: shimResult.isLibFile,
+                    typeReferenceDirectives: [],
+                    libReferenceDirectives: []
+                };
+                ts.forEach(shimResult.referencedFiles, function (refFile) {
+                    convertResult.referencedFiles.push({
+                        fileName: refFile.path,
+                        pos: refFile.position,
+                        end: refFile.position + refFile.length
+                    });
+                });
+                ts.forEach(shimResult.importedFiles, function (importedFile) {
+                    convertResult.importedFiles.push({
+                        fileName: importedFile.path,
+                        pos: importedFile.position,
+                        end: importedFile.position + importedFile.length
+                    });
+                });
+                ts.forEach(shimResult.typeReferenceDirectives, function (typeRefDirective) {
+                    convertResult.importedFiles.push({
+                        fileName: typeRefDirective.path,
+                        pos: typeRefDirective.position,
+                        end: typeRefDirective.position + typeRefDirective.length
+                    });
+                });
+                return convertResult;
+            };
+            return ShimLanguageServiceAdapter;
+        }());
+        LanguageService.ShimLanguageServiceAdapter = ShimLanguageServiceAdapter;
+        // Server adapter
+        var SessionClientHost = /** @class */ (function (_super) {
+            __extends(SessionClientHost, _super);
+            function SessionClientHost(cancellationToken, settings) {
+                var _this = _super.call(this, cancellationToken, settings) || this;
+                _this.onMessage = ts.noop;
+                _this.writeMessage = ts.noop;
+                return _this;
+            }
+            SessionClientHost.prototype.setClient = function (client) {
+                this.client = client;
+            };
+            SessionClientHost.prototype.openFile = function (fileName, content, scriptKindName) {
+                _super.prototype.openFile.call(this, fileName, content, scriptKindName);
+                this.client.openFile(fileName, content, scriptKindName);
+            };
+            SessionClientHost.prototype.editScript = function (fileName, start, end, newText) {
+                _super.prototype.editScript.call(this, fileName, start, end, newText);
+                this.client.changeFile(fileName, start, end, newText);
+            };
+            return SessionClientHost;
+        }(NativeLanguageServiceHost));
+        var SessionServerHost = /** @class */ (function () {
+            function SessionServerHost(host) {
+                this.host = host;
+                this.args = [];
+                this.useCaseSensitiveFileNames = false;
+                this.onMessage = ts.noop;
+                this.writeMessage = ts.noop; // overridden
+                this.writeFile = ts.noop;
+                this.exit = ts.noop;
+                this.close = ts.noop;
+                this.newLine = this.host.getNewLine();
+            }
+            SessionServerHost.prototype.write = function (message) {
+                this.writeMessage(message);
+            };
+            SessionServerHost.prototype.readFile = function (fileName) {
+                if (ts.stringContains(fileName, Harness.Compiler.defaultLibFileName)) {
+                    fileName = Harness.Compiler.defaultLibFileName;
+                }
+                var snapshot = this.host.getScriptSnapshot(fileName);
+                return snapshot && ts.getSnapshotText(snapshot);
+            };
+            SessionServerHost.prototype.resolvePath = function (path) {
+                return path;
+            };
+            SessionServerHost.prototype.fileExists = function (path) {
+                return !!this.host.getScriptSnapshot(path);
+            };
+            SessionServerHost.prototype.directoryExists = function () {
+                // for tests assume that directory exists
+                return true;
+            };
+            SessionServerHost.prototype.getExecutingFilePath = function () {
+                return "";
+            };
+            SessionServerHost.prototype.createDirectory = function (_directoryName) {
+                return ts.notImplemented();
+            };
+            SessionServerHost.prototype.getCurrentDirectory = function () {
+                return this.host.getCurrentDirectory();
+            };
+            SessionServerHost.prototype.getDirectories = function () {
+                return [];
+            };
+            SessionServerHost.prototype.getEnvironmentVariable = function (name) {
+                return ts.sys.getEnvironmentVariable(name);
+            };
+            SessionServerHost.prototype.readDirectory = function () { return ts.notImplemented(); };
+            SessionServerHost.prototype.watchFile = function () {
+                return { close: ts.noop };
+            };
+            SessionServerHost.prototype.watchDirectory = function () {
+                return { close: ts.noop };
+            };
+            SessionServerHost.prototype.info = function (message) {
+                this.host.log(message);
+            };
+            SessionServerHost.prototype.msg = function (message) {
+                this.host.log(message);
+            };
+            SessionServerHost.prototype.loggingEnabled = function () {
+                return true;
+            };
+            SessionServerHost.prototype.getLogFileName = function () {
+                return undefined;
+            };
+            SessionServerHost.prototype.hasLevel = function () {
+                return false;
+            };
+            SessionServerHost.prototype.startGroup = function () { throw ts.notImplemented(); };
+            SessionServerHost.prototype.endGroup = function () { throw ts.notImplemented(); };
+            SessionServerHost.prototype.perftrc = function (message) {
+                return this.host.log(message);
+            };
+            SessionServerHost.prototype.setTimeout = function (callback, ms) {
+                var args = [];
+                for (var _i = 2; _i < arguments.length; _i++) {
+                    args[_i - 2] = arguments[_i];
+                }
+                return setTimeout(callback, ms, args);
+            };
+            SessionServerHost.prototype.clearTimeout = function (timeoutId) {
+                clearTimeout(timeoutId);
+            };
+            SessionServerHost.prototype.setImmediate = function (callback, _ms) {
+                var args = [];
+                for (var _i = 2; _i < arguments.length; _i++) {
+                    args[_i - 2] = arguments[_i];
+                }
+                return setImmediate(callback, args);
+            };
+            SessionServerHost.prototype.clearImmediate = function (timeoutId) {
+                clearImmediate(timeoutId);
+            };
+            SessionServerHost.prototype.createHash = function (s) {
+                return Harness.mockHash(s);
+            };
+            SessionServerHost.prototype.require = function (_initialDir, _moduleName) {
+                switch (_moduleName) {
+                    // Adds to the Quick Info a fixed string and a string from the config file
+                    // and replaces the first display part
+                    case "quickinfo-augmeneter":
+                        return {
+                            module: function () { return ({
+                                create: function (info) {
+                                    var proxy = makeDefaultProxy(info);
+                                    var langSvc = info.languageService;
+                                    // tslint:disable-next-line only-arrow-functions
+                                    proxy.getQuickInfoAtPosition = function () {
+                                        var parts = langSvc.getQuickInfoAtPosition.apply(langSvc, arguments);
+                                        if (parts.displayParts.length > 0) {
+                                            parts.displayParts[0].text = "Proxied";
+                                        }
+                                        parts.displayParts.push({ text: info.config.message, kind: "punctuation" });
+                                        return parts;
+                                    };
+                                    return proxy;
+                                }
+                            }); },
+                            error: undefined
+                        };
+                    // Throws during initialization
+                    case "create-thrower":
+                        return {
+                            module: function () { return ({
+                                create: function () {
+                                    throw new Error("I am not a well-behaved plugin");
+                                }
+                            }); },
+                            error: undefined
+                        };
+                    // Adds another diagnostic
+                    case "diagnostic-adder":
+                        return {
+                            module: function () { return ({
+                                create: function (info) {
+                                    var proxy = makeDefaultProxy(info);
+                                    proxy.getSemanticDiagnostics = function (filename) {
+                                        var prev = info.languageService.getSemanticDiagnostics(filename);
+                                        var sourceFile = info.project.getSourceFile(ts.toPath(filename, /*basePath*/ undefined, ts.createGetCanonicalFileName(info.serverHost.useCaseSensitiveFileNames)));
+                                        prev.push({
+                                            category: ts.DiagnosticCategory.Warning,
+                                            file: sourceFile,
+                                            code: 9999,
+                                            length: 3,
+                                            messageText: "Plugin diagnostic",
+                                            start: 0
+                                        });
+                                        return prev;
+                                    };
+                                    return proxy;
+                                }
+                            }); },
+                            error: undefined
+                        };
+                    default:
+                        return {
+                            module: undefined,
+                            error: new Error("Could not resolve module")
+                        };
+                }
+                function makeDefaultProxy(info) {
+                    // tslint:disable-next-line:no-null-keyword
+                    var proxy = Object.create(/*prototype*/ null);
+                    var langSvc = info.languageService;
+                    var _loop_2 = function (k) {
+                        // tslint:disable-next-line only-arrow-functions
+                        proxy[k] = function () {
+                            return langSvc[k].apply(langSvc, arguments);
+                        };
+                    };
+                    for (var _i = 0, _a = Object.keys(langSvc); _i < _a.length; _i++) {
+                        var k = _a[_i];
+                        _loop_2(k);
+                    }
+                    return proxy;
+                }
+            };
+            return SessionServerHost;
+        }());
+        var ServerLanguageServiceAdapter = /** @class */ (function () {
+            function ServerLanguageServiceAdapter(cancellationToken, options) {
+                // This is the main host that tests use to direct tests
+                var clientHost = new SessionClientHost(cancellationToken, options);
+                var client = new ts.server.SessionClient(clientHost);
+                // This host is just a proxy for the clientHost, it uses the client
+                // host to answer server queries about files on disk
+                var serverHost = new SessionServerHost(clientHost);
+                var opts = {
+                    host: serverHost,
+                    cancellationToken: ts.server.nullCancellationToken,
+                    useSingleInferredProject: false,
+                    useInferredProjectPerProjectRoot: false,
+                    typingsInstaller: undefined,
+                    byteLength: Utils.byteLength,
+                    hrtime: process.hrtime,
+                    logger: serverHost,
+                    canUseEvents: true
+                };
+                var server = new ts.server.Session(opts);
+                // Fake the connection between the client and the server
+                serverHost.writeMessage = client.onMessage.bind(client);
+                clientHost.writeMessage = server.onMessage.bind(server);
+                // Wire the client to the host to get notifications when a file is open
+                // or edited.
+                clientHost.setClient(client);
+                // Set the properties
+                this.client = client;
+                this.host = clientHost;
+            }
+            ServerLanguageServiceAdapter.prototype.getHost = function () { return this.host; };
+            ServerLanguageServiceAdapter.prototype.getLanguageService = function () { return this.client; };
+            ServerLanguageServiceAdapter.prototype.getClassifier = function () { throw new Error("getClassifier is not available using the server interface."); };
+            ServerLanguageServiceAdapter.prototype.getPreProcessedFileInfo = function () { throw new Error("getPreProcessedFileInfo is not available using the server interface."); };
+            return ServerLanguageServiceAdapter;
+        }());
+        LanguageService.ServerLanguageServiceAdapter = ServerLanguageServiceAdapter;
+    })(LanguageService = Harness.LanguageService || (Harness.LanguageService = {}));
+})(Harness || (Harness = {}));
+var ts;
+(function (ts) {
+    var TestFSWithWatch;
+    (function (TestFSWithWatch) {
+        TestFSWithWatch.libFile = {
+            path: "/a/lib/lib.d.ts",
+            content: "/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> {}"
+        };
+        TestFSWithWatch.safeList = {
+            path: "/safeList.json",
+            content: JSON.stringify({
+                commander: "commander",
+                express: "express",
+                jquery: "jquery",
+                lodash: "lodash",
+                moment: "moment",
+                chroma: "chroma-js"
+            })
+        };
+        function getExecutingFilePathFromLibFile() {
+            return ts.combinePaths(ts.getDirectoryPath(TestFSWithWatch.libFile.path), "tsc.js");
+        }
+        function createWatchedSystem(fileOrFolderList, params) {
+            if (!params) {
+                params = {};
+            }
+            var host = new TestServerHost(/*withSafelist*/ false, params.useCaseSensitiveFileNames !== undefined ? params.useCaseSensitiveFileNames : false, params.executingFilePath || getExecutingFilePathFromLibFile(), params.currentDirectory || "/", fileOrFolderList, params.newLine, params.useWindowsStylePaths, params.environmentVariables);
+            return host;
+        }
+        TestFSWithWatch.createWatchedSystem = createWatchedSystem;
+        function createServerHost(fileOrFolderList, params) {
+            if (!params) {
+                params = {};
+            }
+            var host = new TestServerHost(/*withSafelist*/ true, params.useCaseSensitiveFileNames !== undefined ? params.useCaseSensitiveFileNames : false, params.executingFilePath || getExecutingFilePathFromLibFile(), params.currentDirectory || "/", fileOrFolderList, params.newLine, params.useWindowsStylePaths, params.environmentVariables);
+            return host;
+        }
+        TestFSWithWatch.createServerHost = createServerHost;
+        function isFile(fileOrFolderOrSymLink) {
+            return ts.isString(fileOrFolderOrSymLink.content);
+        }
+        function isSymLink(fileOrFolderOrSymLink) {
+            return ts.isString(fileOrFolderOrSymLink.symLink);
+        }
+        function isFsFolder(s) {
+            return s && ts.isArray(s.entries);
+        }
+        function isFsFile(s) {
+            return s && ts.isString(s.content);
+        }
+        function isFsSymLink(s) {
+            return s && ts.isString(s.symLink);
+        }
+        function invokeWatcherCallbacks(callbacks, invokeCallback) {
+            if (callbacks) {
+                // The array copy is made to ensure that even if one of the callback removes the callbacks,
+                // we dont miss any callbacks following it
+                var cbs = callbacks.slice();
+                for (var _i = 0, cbs_1 = cbs; _i < cbs_1.length; _i++) {
+                    var cb = cbs_1[_i];
+                    invokeCallback(cb);
+                }
+            }
+        }
+        function getDiffInKeys(map, expectedKeys) {
+            if (map.size === expectedKeys.length) {
+                return "";
+            }
+            var notInActual = [];
+            var duplicates = [];
+            var seen = ts.createMap();
+            ts.forEach(expectedKeys, function (expectedKey) {
+                if (seen.has(expectedKey)) {
+                    duplicates.push(expectedKey);
+                    return;
+                }
+                seen.set(expectedKey, true);
+                if (!map.has(expectedKey)) {
+                    notInActual.push(expectedKey);
+                }
+            });
+            var inActualNotExpected = [];
+            map.forEach(function (_value, key) {
+                if (!seen.has(key)) {
+                    inActualNotExpected.push(key);
+                }
+                seen.set(key, true);
+            });
+            return "\n\nNotInActual: " + notInActual + "\nDuplicates: " + duplicates + "\nInActualButNotInExpected: " + inActualNotExpected;
+        }
+        function verifyMapSize(caption, map, expectedKeys) {
+            assert.equal(map.size, expectedKeys.length, caption + ": incorrect size of map: Actual keys: " + ts.arrayFrom(map.keys()) + " Expected: " + expectedKeys + getDiffInKeys(map, expectedKeys));
+        }
+        TestFSWithWatch.verifyMapSize = verifyMapSize;
+        function checkMapKeys(caption, map, expectedKeys) {
+            verifyMapSize(caption, map, expectedKeys);
+            for (var _i = 0, expectedKeys_1 = expectedKeys; _i < expectedKeys_1.length; _i++) {
+                var name = expectedKeys_1[_i];
+                assert.isTrue(map.has(name), caption + " is expected to contain " + name + ", actual keys: " + ts.arrayFrom(map.keys()));
+            }
+        }
+        function checkMultiMapKeyCount(caption, actual, expectedKeysMapOrArray, eachKeyCount) {
+            var expectedKeys = ts.isArray(expectedKeysMapOrArray) ? ts.arrayToMap(expectedKeysMapOrArray, function (s) { return s; }, function () { return eachKeyCount; }) : expectedKeysMapOrArray;
+            verifyMapSize(caption, actual, ts.arrayFrom(expectedKeys.keys()));
+            expectedKeys.forEach(function (count, name) {
+                assert.isTrue(actual.has(name), caption + ": expected to contain " + name + ", actual keys: " + ts.arrayFrom(actual.keys()));
+                assert.equal(actual.get(name).length, count, caption + ": Expected to be have " + count + " entries for " + name + ". Actual entry: " + JSON.stringify(actual.get(name)));
+            });
+        }
+        TestFSWithWatch.checkMultiMapKeyCount = checkMultiMapKeyCount;
+        function checkArray(caption, actual, expected) {
+            assert.equal(actual.length, expected.length, caption + ": incorrect actual number of files, expected:\r\n" + expected.join("\r\n") + "\r\ngot: " + actual.join("\r\n"));
+            for (var _i = 0, expected_1 = expected; _i < expected_1.length; _i++) {
+                var f = expected_1[_i];
+                assert.equal(true, ts.contains(actual, f), caption + ": expected to find " + f + " in " + actual);
+            }
+        }
+        TestFSWithWatch.checkArray = checkArray;
+        function checkWatchedFiles(host, expectedFiles) {
+            checkMapKeys("watchedFiles", host.watchedFiles, expectedFiles);
+        }
+        TestFSWithWatch.checkWatchedFiles = checkWatchedFiles;
+        function checkWatchedFilesDetailed(host, expectedFiles, eachFileWatchCount) {
+            if (ts.isArray(expectedFiles)) {
+                checkMultiMapKeyCount("watchedFiles", host.watchedFiles, expectedFiles, eachFileWatchCount);
+            }
+            else {
+                checkMultiMapKeyCount("watchedFiles", host.watchedFiles, expectedFiles);
+            }
+        }
+        TestFSWithWatch.checkWatchedFilesDetailed = checkWatchedFilesDetailed;
+        function checkWatchedDirectories(host, expectedDirectories, recursive) {
+            checkMapKeys("watchedDirectories" + (recursive ? " recursive" : ""), recursive ? host.watchedDirectoriesRecursive : host.watchedDirectories, expectedDirectories);
+        }
+        TestFSWithWatch.checkWatchedDirectories = checkWatchedDirectories;
+        function checkWatchedDirectoriesDetailed(host, expectedDirectories, recursiveOrEachDirectoryWatchCount, recursive) {
+            if (ts.isArray(expectedDirectories)) {
+                checkMultiMapKeyCount("watchedDirectories" + (recursive ? " recursive" : ""), recursive ? host.watchedDirectoriesRecursive : host.watchedDirectories, expectedDirectories, recursiveOrEachDirectoryWatchCount);
+            }
+            else {
+                recursive = recursiveOrEachDirectoryWatchCount;
+                checkMultiMapKeyCount("watchedDirectories" + (recursive ? " recursive" : ""), recursive ? host.watchedDirectoriesRecursive : host.watchedDirectories, expectedDirectories);
+            }
+        }
+        TestFSWithWatch.checkWatchedDirectoriesDetailed = checkWatchedDirectoriesDetailed;
+        function checkOutputContains(host, expected) {
+            var mapExpected = ts.arrayToSet(expected);
+            var mapSeen = ts.createMap();
+            for (var _i = 0, _a = host.getOutput(); _i < _a.length; _i++) {
+                var f = _a[_i];
+                assert.isUndefined(mapSeen.get(f), "Already found " + f + " in " + JSON.stringify(host.getOutput()));
+                if (mapExpected.has(f)) {
+                    mapExpected.delete(f);
+                    mapSeen.set(f, true);
+                }
+            }
+            assert.equal(mapExpected.size, 0, "Output has missing " + JSON.stringify(ts.arrayFrom(mapExpected.keys())) + " in " + JSON.stringify(host.getOutput()));
+        }
+        TestFSWithWatch.checkOutputContains = checkOutputContains;
+        function checkOutputDoesNotContain(host, expectedToBeAbsent) {
+            var mapExpectedToBeAbsent = ts.arrayToSet(expectedToBeAbsent);
+            for (var _i = 0, _a = host.getOutput(); _i < _a.length; _i++) {
+                var f = _a[_i];
+                assert.isFalse(mapExpectedToBeAbsent.has(f), "Contains " + f + " in " + JSON.stringify(host.getOutput()));
+            }
+        }
+        TestFSWithWatch.checkOutputDoesNotContain = checkOutputDoesNotContain;
+        var Callbacks = /** @class */ (function () {
+            function Callbacks() {
+                this.map = [];
+                this.nextId = 1;
+            }
+            Callbacks.prototype.getNextId = function () {
+                return this.nextId;
+            };
+            Callbacks.prototype.register = function (cb, args) {
+                var timeoutId = this.nextId;
+                this.nextId++;
+                this.map[timeoutId] = cb.bind.apply(cb, [/*this*/ undefined].concat(args));
+                return timeoutId;
+            };
+            Callbacks.prototype.unregister = function (id) {
+                if (typeof id === "number") {
+                    delete this.map[id];
+                }
+            };
+            Callbacks.prototype.count = function () {
+                var n = 0;
+                for (var _ in this.map) {
+                    n++;
+                }
+                return n;
+            };
+            Callbacks.prototype.invoke = function (invokeKey) {
+                if (invokeKey) {
+                    this.map[invokeKey]();
+                    delete this.map[invokeKey];
+                    return;
+                }
+                // Note: invoking a callback may result in new callbacks been queued,
+                // so do not clear the entire callback list regardless. Only remove the
+                // ones we have invoked.
+                for (var key in this.map) {
+                    this.map[key]();
+                    delete this.map[key];
+                }
+            };
+            return Callbacks;
+        }());
+        var Tsc_WatchDirectory;
+        (function (Tsc_WatchDirectory) {
+            Tsc_WatchDirectory["WatchFile"] = "RecursiveDirectoryUsingFsWatchFile";
+            Tsc_WatchDirectory["NonRecursiveWatchDirectory"] = "RecursiveDirectoryUsingNonRecursiveWatchDirectory";
+            Tsc_WatchDirectory["DynamicPolling"] = "RecursiveDirectoryUsingDynamicPriorityPolling";
+        })(Tsc_WatchDirectory = TestFSWithWatch.Tsc_WatchDirectory || (TestFSWithWatch.Tsc_WatchDirectory = {}));
+        var timeIncrements = 1000;
+        var TestServerHost = /** @class */ (function () {
+            function TestServerHost(withSafeList, useCaseSensitiveFileNames, executingFilePath, currentDirectory, fileOrFolderorSymLinkList, newLine, useWindowsStylePath, environmentVariables) {
+                if (newLine === void 0) { newLine = "\n"; }
+                var _this = this;
+                this.withSafeList = withSafeList;
+                this.useCaseSensitiveFileNames = useCaseSensitiveFileNames;
+                this.newLine = newLine;
+                this.useWindowsStylePath = useWindowsStylePath;
+                this.environmentVariables = environmentVariables;
+                this.args = [];
+                this.output = [];
+                this.fs = ts.createMap();
+                this.time = timeIncrements;
+                this.timeoutCallbacks = new Callbacks();
+                this.immediateCallbacks = new Callbacks();
+                this.screenClears = [];
+                this.watchedDirectories = ts.createMultiMap();
+                this.watchedDirectoriesRecursive = ts.createMultiMap();
+                this.watchedFiles = ts.createMultiMap();
+                this.exitMessage = "System Exit";
+                this.resolvePath = function (s) { return s; };
+                this.getExecutingFilePath = function () { return _this.executingFilePath; };
+                this.getCurrentDirectory = function () { return _this.currentDirectory; };
+                this.getCanonicalFileName = ts.createGetCanonicalFileName(useCaseSensitiveFileNames);
+                this.toPath = function (s) { return ts.toPath(s, currentDirectory, _this.getCanonicalFileName); };
+                this.executingFilePath = this.getHostSpecificPath(executingFilePath);
+                this.currentDirectory = this.getHostSpecificPath(currentDirectory);
+                this.reloadFS(fileOrFolderorSymLinkList);
+                this.dynamicPriorityWatchFile = this.environmentVariables && this.environmentVariables.get("TSC_WATCHFILE") === "DynamicPriorityPolling" ?
+                    ts.createDynamicPriorityPollingWatchFile(this) :
+                    undefined;
+                var tscWatchDirectory = this.environmentVariables && this.environmentVariables.get("TSC_WATCHDIRECTORY");
+                if (tscWatchDirectory === Tsc_WatchDirectory.WatchFile) {
+                    var watchDirectory = function (directory, cb) { return _this.watchFile(directory, function () { return cb(directory); }, ts.PollingInterval.Medium); };
+                    this.customRecursiveWatchDirectory = ts.createRecursiveDirectoryWatcher({
+                        directoryExists: function (path) { return _this.directoryExists(path); },
+                        getAccessibleSortedChildDirectories: function (path) { return _this.getDirectories(path); },
+                        filePathComparer: this.useCaseSensitiveFileNames ? ts.compareStringsCaseSensitive : ts.compareStringsCaseInsensitive,
+                        watchDirectory: watchDirectory,
+                        realpath: function (s) { return _this.realpath(s); }
+                    });
+                }
+                else if (tscWatchDirectory === Tsc_WatchDirectory.NonRecursiveWatchDirectory) {
+                    var watchDirectory = function (directory, cb) { return _this.watchDirectory(directory, function (fileName) { return cb(fileName); }, /*recursive*/ false); };
+                    this.customRecursiveWatchDirectory = ts.createRecursiveDirectoryWatcher({
+                        directoryExists: function (path) { return _this.directoryExists(path); },
+                        getAccessibleSortedChildDirectories: function (path) { return _this.getDirectories(path); },
+                        filePathComparer: this.useCaseSensitiveFileNames ? ts.compareStringsCaseSensitive : ts.compareStringsCaseInsensitive,
+                        watchDirectory: watchDirectory,
+                        realpath: function (s) { return _this.realpath(s); }
+                    });
+                }
+                else if (tscWatchDirectory === Tsc_WatchDirectory.DynamicPolling) {
+                    var watchFile_1 = ts.createDynamicPriorityPollingWatchFile(this);
+                    var watchDirectory = function (directory, cb) { return watchFile_1(directory, function () { return cb(directory); }, ts.PollingInterval.Medium); };
+                    this.customRecursiveWatchDirectory = ts.createRecursiveDirectoryWatcher({
+                        directoryExists: function (path) { return _this.directoryExists(path); },
+                        getAccessibleSortedChildDirectories: function (path) { return _this.getDirectories(path); },
+                        filePathComparer: this.useCaseSensitiveFileNames ? ts.compareStringsCaseSensitive : ts.compareStringsCaseInsensitive,
+                        watchDirectory: watchDirectory,
+                        realpath: function (s) { return _this.realpath(s); }
+                    });
+                }
+            }
+            TestServerHost.prototype.getNewLine = function () {
+                return this.newLine;
+            };
+            TestServerHost.prototype.toNormalizedAbsolutePath = function (s) {
+                return ts.getNormalizedAbsolutePath(s, this.currentDirectory);
+            };
+            TestServerHost.prototype.toFullPath = function (s) {
+                return this.toPath(this.toNormalizedAbsolutePath(s));
+            };
+            TestServerHost.prototype.getHostSpecificPath = function (s) {
+                if (this.useWindowsStylePath && s.startsWith(ts.directorySeparator)) {
+                    return "c:/" + s.substring(1);
+                }
+                return s;
+            };
+            TestServerHost.prototype.now = function () {
+                this.time += timeIncrements;
+                return new Date(this.time);
+            };
+            TestServerHost.prototype.reloadFS = function (fileOrFolderOrSymLinkList, options) {
+                var _this = this;
+                var mapNewLeaves = ts.createMap();
+                var isNewFs = this.fs.size === 0;
+                fileOrFolderOrSymLinkList = fileOrFolderOrSymLinkList.concat(this.withSafeList ? TestFSWithWatch.safeList : []);
+                var filesOrFoldersToLoad = !this.useWindowsStylePath ? fileOrFolderOrSymLinkList :
+                    fileOrFolderOrSymLinkList.map(function (f) {
+                        var result = ts.clone(f);
+                        result.path = _this.getHostSpecificPath(f.path);
+                        return result;
+                    });
+                for (var _i = 0, filesOrFoldersToLoad_1 = filesOrFoldersToLoad; _i < filesOrFoldersToLoad_1.length; _i++) {
+                    var fileOrDirectory = filesOrFoldersToLoad_1[_i];
+                    var path = this.toFullPath(fileOrDirectory.path);
+                    mapNewLeaves.set(path, true);
+                    // If its a change
+                    var currentEntry = this.fs.get(path);
+                    if (currentEntry) {
+                        if (isFsFile(currentEntry)) {
+                            if (isFile(fileOrDirectory)) {
+                                // Update file
+                                if (currentEntry.content !== fileOrDirectory.content) {
+                                    this.modifyFile(fileOrDirectory.path, fileOrDirectory.content, options);
+                                }
+                            }
+                            else {
+                                // TODO: Changing from file => folder/Symlink
+                            }
+                        }
+                        else if (isFsSymLink(currentEntry)) {
+                            // TODO: update symlinks
+                        }
+                        else {
+                            // Folder
+                            if (isFile(fileOrDirectory)) {
+                                // TODO: Changing from folder => file
+                            }
+                            else {
+                                // Folder update: Nothing to do.
+                                currentEntry.modifiedTime = this.now();
+                            }
+                        }
+                    }
+                    else {
+                        this.ensureFileOrFolder(fileOrDirectory, options && options.ignoreWatchInvokedWithTriggerAsFileCreate);
+                    }
+                }
+                if (!isNewFs) {
+                    this.fs.forEach(function (fileOrDirectory, path) {
+                        // If this entry is not from the new file or folder
+                        if (!mapNewLeaves.get(path)) {
+                            // Leaf entries that arent in new list => remove these
+                            if (isFsFile(fileOrDirectory) || isFsSymLink(fileOrDirectory) || isFsFolder(fileOrDirectory) && fileOrDirectory.entries.length === 0) {
+                                _this.removeFileOrFolder(fileOrDirectory, function (folder) { return !mapNewLeaves.get(folder.path); });
+                            }
+                        }
+                    });
+                }
+            };
+            TestServerHost.prototype.modifyFile = function (filePath, content, options) {
+                var path = this.toFullPath(filePath);
+                var currentEntry = this.fs.get(path);
+                if (!currentEntry || !isFsFile(currentEntry)) {
+                    throw new Error("file not present: " + filePath);
+                }
+                if (options && options.invokeFileDeleteCreateAsPartInsteadOfChange) {
+                    this.removeFileOrFolder(currentEntry, ts.returnFalse);
+                    this.ensureFileOrFolder({ path: filePath, content: content });
+                }
+                else {
+                    currentEntry.content = content;
+                    currentEntry.modifiedTime = this.now();
+                    this.fs.get(ts.getDirectoryPath(currentEntry.path)).modifiedTime = this.now();
+                    if (options && options.invokeDirectoryWatcherInsteadOfFileChanged) {
+                        this.invokeDirectoryWatcher(ts.getDirectoryPath(currentEntry.fullPath), currentEntry.fullPath);
+                    }
+                    else {
+                        this.invokeFileWatcher(currentEntry.fullPath, ts.FileWatcherEventKind.Changed);
+                    }
+                }
+            };
+            TestServerHost.prototype.renameFolder = function (folderName, newFolderName) {
+                var fullPath = ts.getNormalizedAbsolutePath(folderName, this.currentDirectory);
+                var path = this.toPath(fullPath);
+                var folder = this.fs.get(path);
+                ts.Debug.assert(!!folder);
+                // Only remove the folder
+                this.removeFileOrFolder(folder, ts.returnFalse, /*isRenaming*/ true);
+                // Add updated folder with new folder name
+                var newFullPath = ts.getNormalizedAbsolutePath(newFolderName, this.currentDirectory);
+                var newFolder = this.toFsFolder(newFullPath);
+                var newPath = newFolder.path;
+                var basePath = ts.getDirectoryPath(path);
+                ts.Debug.assert(basePath !== path);
+                ts.Debug.assert(basePath === ts.getDirectoryPath(newPath));
+                var baseFolder = this.fs.get(basePath);
+                this.addFileOrFolderInFolder(baseFolder, newFolder);
+                // Invoke watches for files in the folder as deleted (from old path)
+                this.renameFolderEntries(folder, newFolder);
+            };
+            TestServerHost.prototype.renameFolderEntries = function (oldFolder, newFolder) {
+                for (var _i = 0, _a = oldFolder.entries; _i < _a.length; _i++) {
+                    var entry = _a[_i];
+                    this.fs.delete(entry.path);
+                    this.invokeFileWatcher(entry.fullPath, ts.FileWatcherEventKind.Deleted);
+                    entry.fullPath = ts.combinePaths(newFolder.fullPath, ts.getBaseFileName(entry.fullPath));
+                    entry.path = this.toPath(entry.fullPath);
+                    if (newFolder !== oldFolder) {
+                        newFolder.entries.push(entry);
+                    }
+                    this.fs.set(entry.path, entry);
+                    this.invokeFileWatcher(entry.fullPath, ts.FileWatcherEventKind.Created);
+                    if (isFsFolder(entry)) {
+                        this.renameFolderEntries(entry, entry);
+                    }
+                }
+            };
+            TestServerHost.prototype.ensureFileOrFolder = function (fileOrDirectoryOrSymLink, ignoreWatchInvokedWithTriggerAsFileCreate) {
+                if (isFile(fileOrDirectoryOrSymLink)) {
+                    var file = this.toFsFile(fileOrDirectoryOrSymLink);
+                    // file may already exist when updating existing type declaration file
+                    if (!this.fs.get(file.path)) {
+                        var baseFolder = this.ensureFolder(ts.getDirectoryPath(file.fullPath));
+                        this.addFileOrFolderInFolder(baseFolder, file, ignoreWatchInvokedWithTriggerAsFileCreate);
+                    }
+                }
+                else if (isSymLink(fileOrDirectoryOrSymLink)) {
+                    var symLink = this.toFsSymLink(fileOrDirectoryOrSymLink);
+                    ts.Debug.assert(!this.fs.get(symLink.path));
+                    var baseFolder = this.ensureFolder(ts.getDirectoryPath(symLink.fullPath));
+                    this.addFileOrFolderInFolder(baseFolder, symLink, ignoreWatchInvokedWithTriggerAsFileCreate);
+                }
+                else {
+                    var fullPath = ts.getNormalizedAbsolutePath(fileOrDirectoryOrSymLink.path, this.currentDirectory);
+                    this.ensureFolder(fullPath);
+                }
+            };
+            TestServerHost.prototype.ensureFolder = function (fullPath) {
+                var path = this.toPath(fullPath);
+                var folder = this.fs.get(path);
+                if (!folder) {
+                    folder = this.toFsFolder(fullPath);
+                    var baseFullPath = ts.getDirectoryPath(fullPath);
+                    if (fullPath !== baseFullPath) {
+                        // Add folder in the base folder
+                        var baseFolder = this.ensureFolder(baseFullPath);
+                        this.addFileOrFolderInFolder(baseFolder, folder);
+                    }
+                    else {
+                        // root folder
+                        ts.Debug.assert(this.fs.size === 0);
+                        this.fs.set(path, folder);
+                    }
+                }
+                ts.Debug.assert(isFsFolder(folder));
+                return folder;
+            };
+            TestServerHost.prototype.addFileOrFolderInFolder = function (folder, fileOrDirectory, ignoreWatch) {
+                ts.insertSorted(folder.entries, fileOrDirectory, function (a, b) { return ts.compareStringsCaseSensitive(ts.getBaseFileName(a.path), ts.getBaseFileName(b.path)); });
+                folder.modifiedTime = this.now();
+                this.fs.set(fileOrDirectory.path, fileOrDirectory);
+                if (ignoreWatch) {
+                    return;
+                }
+                this.invokeFileWatcher(fileOrDirectory.fullPath, ts.FileWatcherEventKind.Created);
+                this.invokeDirectoryWatcher(folder.fullPath, fileOrDirectory.fullPath);
+            };
+            TestServerHost.prototype.removeFileOrFolder = function (fileOrDirectory, isRemovableLeafFolder, isRenaming) {
+                if (isRenaming === void 0) { isRenaming = false; }
+                var basePath = ts.getDirectoryPath(fileOrDirectory.path);
+                var baseFolder = this.fs.get(basePath);
+                if (basePath !== fileOrDirectory.path) {
+                    ts.Debug.assert(!!baseFolder);
+                    baseFolder.modifiedTime = this.now();
+                    ts.filterMutate(baseFolder.entries, function (entry) { return entry !== fileOrDirectory; });
+                }
+                this.fs.delete(fileOrDirectory.path);
+                this.invokeFileWatcher(fileOrDirectory.fullPath, ts.FileWatcherEventKind.Deleted);
+                if (isFsFolder(fileOrDirectory)) {
+                    ts.Debug.assert(fileOrDirectory.entries.length === 0 || isRenaming);
+                    var relativePath = this.getRelativePathToDirectory(fileOrDirectory.fullPath, fileOrDirectory.fullPath);
+                    // Invoke directory and recursive directory watcher for the folder
+                    // Here we arent invoking recursive directory watchers for the base folders
+                    // since that is something we would want to do for both file as well as folder we are deleting
+                    this.invokeWatchedDirectoriesCallback(fileOrDirectory.fullPath, relativePath);
+                    this.invokeWatchedDirectoriesRecursiveCallback(fileOrDirectory.fullPath, relativePath);
+                }
+                if (basePath !== fileOrDirectory.path) {
+                    if (baseFolder.entries.length === 0 && isRemovableLeafFolder(baseFolder)) {
+                        this.removeFileOrFolder(baseFolder, isRemovableLeafFolder);
+                    }
+                    else {
+                        this.invokeRecursiveDirectoryWatcher(baseFolder.fullPath, fileOrDirectory.fullPath);
+                    }
+                }
+            };
+            TestServerHost.prototype.removeFolder = function (folderPath, recursive) {
+                var _this = this;
+                var path = this.toFullPath(folderPath);
+                var currentEntry = this.fs.get(path);
+                ts.Debug.assert(isFsFolder(currentEntry));
+                if (recursive && currentEntry.entries.length) {
+                    var subEntries = currentEntry.entries.slice();
+                    subEntries.forEach(function (fsEntry) {
+                        if (isFsFolder(fsEntry)) {
+                            _this.removeFolder(fsEntry.fullPath, recursive);
+                        }
+                        else {
+                            _this.removeFileOrFolder(fsEntry, ts.returnFalse);
+                        }
+                    });
+                }
+                this.removeFileOrFolder(currentEntry, ts.returnFalse);
+            };
+            // For overriding the methods
+            TestServerHost.prototype.invokeWatchedDirectoriesCallback = function (folderFullPath, relativePath) {
+                var _this = this;
+                invokeWatcherCallbacks(this.watchedDirectories.get(this.toPath(folderFullPath)), function (cb) { return _this.directoryCallback(cb, relativePath); });
+            };
+            TestServerHost.prototype.invokeWatchedDirectoriesRecursiveCallback = function (folderFullPath, relativePath) {
+                var _this = this;
+                invokeWatcherCallbacks(this.watchedDirectoriesRecursive.get(this.toPath(folderFullPath)), function (cb) { return _this.directoryCallback(cb, relativePath); });
+            };
+            TestServerHost.prototype.invokeFileWatcher = function (fileFullPath, eventKind, useFileNameInCallback) {
+                invokeWatcherCallbacks(this.watchedFiles.get(this.toPath(fileFullPath)), function (_a) {
+                    var cb = _a.cb, fileName = _a.fileName;
+                    return cb(useFileNameInCallback ? fileName : fileFullPath, eventKind);
+                });
+            };
+            TestServerHost.prototype.getRelativePathToDirectory = function (directoryFullPath, fileFullPath) {
+                return ts.getRelativePathToDirectoryOrUrl(directoryFullPath, fileFullPath, this.currentDirectory, this.getCanonicalFileName, /*isAbsolutePathAnUrl*/ false);
+            };
+            /**
+             * This will call the directory watcher for the folderFullPath and recursive directory watchers for this and base folders
+             */
+            TestServerHost.prototype.invokeDirectoryWatcher = function (folderFullPath, fileName) {
+                var relativePath = this.getRelativePathToDirectory(folderFullPath, fileName);
+                // Folder is changed when the directory watcher is invoked
+                this.invokeFileWatcher(folderFullPath, ts.FileWatcherEventKind.Changed, /*useFileNameInCallback*/ true);
+                this.invokeWatchedDirectoriesCallback(folderFullPath, relativePath);
+                this.invokeRecursiveDirectoryWatcher(folderFullPath, fileName);
+            };
+            TestServerHost.prototype.directoryCallback = function (_a, relativePath) {
+                var cb = _a.cb, directoryName = _a.directoryName;
+                cb(ts.combinePaths(directoryName, relativePath));
+            };
+            /**
+             * This will call the recursive directory watcher for this directory as well as all the base directories
+             */
+            TestServerHost.prototype.invokeRecursiveDirectoryWatcher = function (fullPath, fileName) {
+                var relativePath = this.getRelativePathToDirectory(fullPath, fileName);
+                this.invokeWatchedDirectoriesRecursiveCallback(fullPath, relativePath);
+                var basePath = ts.getDirectoryPath(fullPath);
+                if (this.getCanonicalFileName(fullPath) !== this.getCanonicalFileName(basePath)) {
+                    this.invokeRecursiveDirectoryWatcher(basePath, fileName);
+                }
+            };
+            TestServerHost.prototype.toFsEntry = function (path) {
+                var fullPath = ts.getNormalizedAbsolutePath(path, this.currentDirectory);
+                return {
+                    path: this.toPath(fullPath),
+                    fullPath: fullPath,
+                    modifiedTime: this.now()
+                };
+            };
+            TestServerHost.prototype.toFsFile = function (file) {
+                var fsFile = this.toFsEntry(file.path);
+                fsFile.content = file.content;
+                fsFile.fileSize = file.fileSize;
+                return fsFile;
+            };
+            TestServerHost.prototype.toFsSymLink = function (symLink) {
+                var fsSymLink = this.toFsEntry(symLink.path);
+                fsSymLink.symLink = ts.getNormalizedAbsolutePath(symLink.symLink, ts.getDirectoryPath(fsSymLink.fullPath));
+                return fsSymLink;
+            };
+            TestServerHost.prototype.toFsFolder = function (path) {
+                var fsFolder = this.toFsEntry(path);
+                fsFolder.entries = []; // https://github.com/Microsoft/TypeScript/issues/19873
+                return fsFolder;
+            };
+            TestServerHost.prototype.getRealFsEntry = function (isFsEntry, path, fsEntry) {
+                if (fsEntry === void 0) { fsEntry = this.fs.get(path); }
+                if (isFsEntry(fsEntry)) {
+                    return fsEntry;
+                }
+                if (isFsSymLink(fsEntry)) {
+                    return this.getRealFsEntry(isFsEntry, this.toPath(fsEntry.symLink));
+                }
+                if (fsEntry) {
+                    // This fs entry is something else
+                    return undefined;
+                }
+                var realpath = this.realpath(path);
+                if (path !== realpath) {
+                    return this.getRealFsEntry(isFsEntry, this.toPath(realpath));
+                }
+                return undefined;
+            };
+            TestServerHost.prototype.isFsFile = function (fsEntry) {
+                return !!this.getRealFile(fsEntry.path, fsEntry);
+            };
+            TestServerHost.prototype.getRealFile = function (path, fsEntry) {
+                return this.getRealFsEntry(isFsFile, path, fsEntry);
+            };
+            TestServerHost.prototype.isFsFolder = function (fsEntry) {
+                return !!this.getRealFolder(fsEntry.path, fsEntry);
+            };
+            TestServerHost.prototype.getRealFolder = function (path, fsEntry) {
+                if (fsEntry === void 0) { fsEntry = this.fs.get(path); }
+                return this.getRealFsEntry(isFsFolder, path, fsEntry);
+            };
+            TestServerHost.prototype.fileExists = function (s) {
+                var path = this.toFullPath(s);
+                return !!this.getRealFile(path);
+            };
+            TestServerHost.prototype.getModifiedTime = function (s) {
+                var path = this.toFullPath(s);
+                var fsEntry = this.fs.get(path);
+                return (fsEntry && fsEntry.modifiedTime); // TODO: GH#18217
+            };
+            TestServerHost.prototype.readFile = function (s) {
+                var fsEntry = this.getRealFile(this.toFullPath(s));
+                return fsEntry ? fsEntry.content : undefined;
+            };
+            TestServerHost.prototype.getFileSize = function (s) {
+                var path = this.toFullPath(s);
+                var entry = this.fs.get(path);
+                if (isFsFile(entry)) {
+                    return entry.fileSize ? entry.fileSize : entry.content.length;
+                }
+                return undefined; // TODO: GH#18217
+            };
+            TestServerHost.prototype.directoryExists = function (s) {
+                var path = this.toFullPath(s);
+                return !!this.getRealFolder(path);
+            };
+            TestServerHost.prototype.getDirectories = function (s) {
+                var _this = this;
+                var path = this.toFullPath(s);
+                var folder = this.getRealFolder(path);
+                if (folder) {
+                    return ts.mapDefined(folder.entries, function (entry) { return _this.isFsFolder(entry) ? ts.getBaseFileName(entry.fullPath) : undefined; });
+                }
+                ts.Debug.fail(folder ? "getDirectories called on file" : "getDirectories called on missing folder");
+                return [];
+            };
+            TestServerHost.prototype.readDirectory = function (path, extensions, exclude, include, depth) {
+                var _this = this;
+                return ts.matchFiles(path, extensions, exclude, include, this.useCaseSensitiveFileNames, this.getCurrentDirectory(), depth, function (dir) {
+                    var directories = [];
+                    var files = [];
+                    var folder = _this.getRealFolder(_this.toPath(dir));
+                    if (folder) {
+                        folder.entries.forEach(function (entry) {
+                            if (_this.isFsFolder(entry)) {
+                                directories.push(ts.getBaseFileName(entry.fullPath));
+                            }
+                            else if (_this.isFsFile(entry)) {
+                                files.push(ts.getBaseFileName(entry.fullPath));
+                            }
+                            else {
+                                ts.Debug.fail("Unknown entry");
+                            }
+                        });
+                    }
+                    return { directories: directories, files: files };
+                });
+            };
+            TestServerHost.prototype.watchDirectory = function (directoryName, cb, recursive) {
+                if (recursive && this.customRecursiveWatchDirectory) {
+                    return this.customRecursiveWatchDirectory(directoryName, cb, /*recursive*/ true);
+                }
+                var path = this.toFullPath(directoryName);
+                var map = recursive ? this.watchedDirectoriesRecursive : this.watchedDirectories;
+                var callback = {
+                    cb: cb,
+                    directoryName: directoryName
+                };
+                map.add(path, callback);
+                return {
+                    close: function () { return map.remove(path, callback); }
+                };
+            };
+            TestServerHost.prototype.createHash = function (s) {
+                return Harness.mockHash(s);
+            };
+            TestServerHost.prototype.createSHA256Hash = function (s) {
+                return ts.sys.createSHA256Hash(s);
+            };
+            TestServerHost.prototype.watchFile = function (fileName, cb, pollingInterval) {
+                var _this = this;
+                if (this.dynamicPriorityWatchFile) {
+                    return this.dynamicPriorityWatchFile(fileName, cb, pollingInterval);
+                }
+                var path = this.toFullPath(fileName);
+                var callback = { fileName: fileName, cb: cb };
+                this.watchedFiles.add(path, callback);
+                return { close: function () { return _this.watchedFiles.remove(path, callback); } };
+            };
+            // TOOD: record and invoke callbacks to simulate timer events
+            TestServerHost.prototype.setTimeout = function (callback, _time) {
+                var args = [];
+                for (var _i = 2; _i < arguments.length; _i++) {
+                    args[_i - 2] = arguments[_i];
+                }
+                return this.timeoutCallbacks.register(callback, args);
+            };
+            TestServerHost.prototype.getNextTimeoutId = function () {
+                return this.timeoutCallbacks.getNextId();
+            };
+            TestServerHost.prototype.clearTimeout = function (timeoutId) {
+                this.timeoutCallbacks.unregister(timeoutId);
+            };
+            TestServerHost.prototype.clearScreen = function () {
+                this.screenClears.push(this.output.length);
+            };
+            TestServerHost.prototype.checkTimeoutQueueLengthAndRun = function (expected) {
+                this.checkTimeoutQueueLength(expected);
+                this.runQueuedTimeoutCallbacks();
+            };
+            TestServerHost.prototype.checkTimeoutQueueLength = function (expected) {
+                var callbacksCount = this.timeoutCallbacks.count();
+                assert.equal(callbacksCount, expected, "expected " + expected + " timeout callbacks queued but found " + callbacksCount + ".");
+            };
+            TestServerHost.prototype.runQueuedTimeoutCallbacks = function (timeoutId) {
+                try {
+                    this.timeoutCallbacks.invoke(timeoutId);
+                }
+                catch (e) {
+                    if (e.message === this.exitMessage) {
+                        return;
+                    }
+                    throw e;
+                }
+            };
+            TestServerHost.prototype.runQueuedImmediateCallbacks = function (checkCount) {
+                if (checkCount !== undefined) {
+                    assert.equal(this.immediateCallbacks.count(), checkCount);
+                }
+                this.immediateCallbacks.invoke();
+            };
+            TestServerHost.prototype.setImmediate = function (callback, _time) {
+                var args = [];
+                for (var _i = 2; _i < arguments.length; _i++) {
+                    args[_i - 2] = arguments[_i];
+                }
+                return this.immediateCallbacks.register(callback, args);
+            };
+            TestServerHost.prototype.clearImmediate = function (timeoutId) {
+                this.immediateCallbacks.unregister(timeoutId);
+            };
+            TestServerHost.prototype.createDirectory = function (directoryName) {
+                var folder = this.toFsFolder(directoryName);
+                // base folder has to be present
+                var base = ts.getDirectoryPath(folder.path);
+                var baseFolder = this.fs.get(base);
+                ts.Debug.assert(isFsFolder(baseFolder));
+                ts.Debug.assert(!this.fs.get(folder.path));
+                this.addFileOrFolderInFolder(baseFolder, folder);
+            };
+            TestServerHost.prototype.writeFile = function (path, content) {
+                var file = this.toFsFile({ path: path, content: content });
+                // base folder has to be present
+                var base = ts.getDirectoryPath(file.path);
+                var folder = this.fs.get(base);
+                ts.Debug.assert(isFsFolder(folder));
+                this.addFileOrFolderInFolder(folder, file);
+            };
+            TestServerHost.prototype.write = function (message) {
+                this.output.push(message);
+            };
+            TestServerHost.prototype.getOutput = function () {
+                return this.output;
+            };
+            TestServerHost.prototype.clearOutput = function () {
+                ts.clear(this.output);
+                this.screenClears.length = 0;
+            };
+            TestServerHost.prototype.realpath = function (s) {
+                var fullPath = this.toNormalizedAbsolutePath(s);
+                var path = this.toPath(fullPath);
+                if (ts.getDirectoryPath(path) === path) {
+                    // Root
+                    return s;
+                }
+                var dirFullPath = this.realpath(ts.getDirectoryPath(fullPath));
+                var realFullPath = ts.combinePaths(dirFullPath, ts.getBaseFileName(fullPath));
+                var fsEntry = this.fs.get(this.toPath(realFullPath));
+                if (isFsSymLink(fsEntry)) {
+                    return this.realpath(fsEntry.symLink);
+                }
+                return realFullPath;
+            };
+            TestServerHost.prototype.exit = function (exitCode) {
+                this.exitCode = exitCode;
+                throw new Error(this.exitMessage);
+            };
+            TestServerHost.prototype.getEnvironmentVariable = function (name) {
+                return this.environmentVariables && this.environmentVariables.get(name) || "";
+            };
+            return TestServerHost;
+        }());
+        TestFSWithWatch.TestServerHost = TestServerHost;
+    })(TestFSWithWatch = ts.TestFSWithWatch || (ts.TestFSWithWatch = {}));
+})(ts || (ts = {}));
+var FourSlash;
+(function (FourSlash) {
+    ts.disableIncrementalParsing = false;
+    var FourSlashTestType;
+    (function (FourSlashTestType) {
+        FourSlashTestType[FourSlashTestType["Native"] = 0] = "Native";
+        FourSlashTestType[FourSlashTestType["Shims"] = 1] = "Shims";
+        FourSlashTestType[FourSlashTestType["ShimsWithPreprocess"] = 2] = "ShimsWithPreprocess";
+        FourSlashTestType[FourSlashTestType["Server"] = 3] = "Server";
+    })(FourSlashTestType = FourSlash.FourSlashTestType || (FourSlash.FourSlashTestType = {}));
+    // Name of testcase metadata including ts.CompilerOptions properties that will be used by globalOptions
+    // To add additional option, add property into the testOptMetadataNames, refer the property in either globalMetadataNames or fileMetadataNames
+    // Add cases into convertGlobalOptionsToCompilationsSettings function for the compiler to acknowledge such option from meta data
+    var MetadataOptionNames;
+    (function (MetadataOptionNames) {
+        MetadataOptionNames["baselineFile"] = "BaselineFile";
+        MetadataOptionNames["emitThisFile"] = "emitThisFile";
+        MetadataOptionNames["fileName"] = "Filename";
+        MetadataOptionNames["resolveReference"] = "ResolveReference";
+        MetadataOptionNames["symlink"] = "Symlink";
+    })(MetadataOptionNames || (MetadataOptionNames = {}));
+    // List of allowed metadata names
+    var fileMetadataNames = ["Filename" /* fileName */, "emitThisFile" /* emitThisFile */, "ResolveReference" /* resolveReference */, "Symlink" /* symlink */];
+    function convertGlobalOptionsToCompilerOptions(globalOptions) {
+        var settings = { target: 1 /* ES5 */ };
+        Harness.Compiler.setCompilerOptionsFromHarnessSetting(globalOptions, settings);
+        return settings;
+    }
+    var TestCancellationToken = /** @class */ (function () {
+        function TestCancellationToken() {
+            this.numberOfCallsBeforeCancellation = TestCancellationToken.notCanceled;
+        }
+        TestCancellationToken.prototype.isCancellationRequested = function () {
+            if (this.numberOfCallsBeforeCancellation < 0) {
+                return false;
+            }
+            if (this.numberOfCallsBeforeCancellation > 0) {
+                this.numberOfCallsBeforeCancellation--;
+                return false;
+            }
+            return true;
+        };
+        TestCancellationToken.prototype.setCancelled = function (numberOfCalls) {
+            if (numberOfCalls === void 0) { numberOfCalls = 0; }
+            ts.Debug.assert(numberOfCalls >= 0);
+            this.numberOfCallsBeforeCancellation = numberOfCalls;
+        };
+        TestCancellationToken.prototype.resetCancelled = function () {
+            this.numberOfCallsBeforeCancellation = TestCancellationToken.notCanceled;
+        };
+        // 0 - cancelled
+        // >0 - not cancelled
+        // <0 - not cancelled and value denotes number of isCancellationRequested after which token become cancelled
+        TestCancellationToken.notCanceled = -1;
+        return TestCancellationToken;
+    }());
+    FourSlash.TestCancellationToken = TestCancellationToken;
+    function verifyOperationIsCancelled(f) {
+        try {
+            f();
+        }
+        catch (e) {
+            if (e instanceof ts.OperationCanceledException) {
+                return;
+            }
+        }
+        throw new Error("Operation should be cancelled");
+    }
+    FourSlash.verifyOperationIsCancelled = verifyOperationIsCancelled;
+    // This function creates IScriptSnapshot object for testing getPreProcessedFileInfo
+    // Return object may lack some functionalities for other purposes.
+    function createScriptSnapShot(sourceText) {
+        return ts.ScriptSnapshot.fromString(sourceText);
+    }
+    var TestState = /** @class */ (function () {
+        function TestState(basePath, testType, testData) {
+            var _a;
+            var _this = this;
+            this.basePath = basePath;
+            this.testType = testType;
+            this.testData = testData;
+            // The current caret position in the active file
+            this.currentCaretPosition = 0;
+            // The position of the end of the current selection, or -1 if nothing is selected
+            this.selectionEnd = -1;
+            this.lastKnownMarker = "";
+            // Whether or not we should format on keystrokes
+            this.enableFormatting = true;
+            this.inputFiles = ts.createMap(); // Map between inputFile's fileName and its content for easily looking up when resolving references
+            this.alignmentForExtraInfo = 50;
+            // Create a new Services Adapter
+            this.cancellationToken = new TestCancellationToken();
+            var compilationOptions = convertGlobalOptionsToCompilerOptions(this.testData.globalOptions);
+            compilationOptions.skipDefaultLibCheck = true;
+            // Initialize the language service with all the scripts
+            var startResolveFileRef;
+            var configFileName;
+            for (var _i = 0, _b = testData.files; _i < _b.length; _i++) {
+                var file = _b[_i];
+                // Create map between fileName and its content for easily looking up when resolveReference flag is specified
+                this.inputFiles.set(file.fileName, file.content);
+                if (isConfig(file)) {
+                    var configJson = ts.parseConfigFileTextToJson(file.fileName, file.content);
+                    if (configJson.config === undefined) {
+                        throw new Error("Failed to parse test " + file.fileName + ": " + configJson.error.messageText);
+                    }
+                    // Extend our existing compiler options so that we can also support tsconfig only options
+                    if (configJson.config.compilerOptions) {
+                        var baseDirectory = ts.normalizePath(ts.getDirectoryPath(file.fileName));
+                        var tsConfig = ts.convertCompilerOptionsFromJson(configJson.config.compilerOptions, baseDirectory, file.fileName);
+                        if (!tsConfig.errors || !tsConfig.errors.length) {
+                            compilationOptions = ts.extend(compilationOptions, tsConfig.options);
+                        }
+                    }
+                    configFileName = file.fileName;
+                }
+                if (!startResolveFileRef && file.fileOptions["ResolveReference" /* resolveReference */] === "true") {
+                    startResolveFileRef = file;
+                }
+                else if (startResolveFileRef) {
+                    // If entry point for resolving file references is already specified, report duplication error
+                    throw new Error("There exists a Fourslash file which has resolveReference flag specified; remove duplicated resolveReference flag");
+                }
+            }
+            if (configFileName) {
+                var baseDir = ts.normalizePath(ts.getDirectoryPath(configFileName));
+                var files_2 = (_a = {}, _a[baseDir] = {}, _a);
+                this.inputFiles.forEach(function (data, path) {
+                    var scriptInfo = new Harness.LanguageService.ScriptInfo(path, undefined, /*isRootFile*/ false); // TODO: GH#18217
+                    files_2[path] = new vfs.File(data, { meta: { scriptInfo: scriptInfo } });
+                });
+                var fs = new vfs.FileSystem(/*ignoreCase*/ true, { cwd: baseDir, files: files_2 });
+                var host = new fakes.ParseConfigHost(fs);
+                var jsonSourceFile = ts.parseJsonText(configFileName, this.inputFiles.get(configFileName));
+                compilationOptions = ts.parseJsonSourceFileConfigFileContent(jsonSourceFile, host, baseDir, compilationOptions, configFileName).options;
+            }
+            if (compilationOptions.typeRoots) {
+                compilationOptions.typeRoots = compilationOptions.typeRoots.map(function (p) { return ts.getNormalizedAbsolutePath(p, _this.basePath); });
+            }
+            var languageServiceAdapter = this.getLanguageServiceAdapter(testType, this.cancellationToken, compilationOptions);
+            this.languageServiceAdapterHost = languageServiceAdapter.getHost();
+            this.languageService = memoWrap(languageServiceAdapter.getLanguageService(), this); // Wrap the LS to cache some expensive operations certain tests call repeatedly
+            if (startResolveFileRef) {
+                // Add the entry-point file itself into the languageServiceShimHost
+                this.languageServiceAdapterHost.addScript(startResolveFileRef.fileName, startResolveFileRef.content, /*isRootFile*/ true);
+                var resolvedResult = languageServiceAdapter.getPreProcessedFileInfo(startResolveFileRef.fileName, startResolveFileRef.content);
+                var referencedFiles = resolvedResult.referencedFiles;
+                var importedFiles = resolvedResult.importedFiles;
+                // Add triple reference files into language-service host
+                ts.forEach(referencedFiles, function (referenceFile) {
+                    // Fourslash insert tests/cases/fourslash into inputFile.unitName so we will properly append the same base directory to refFile path
+                    var referenceFilePath = _this.basePath + "/" + referenceFile.fileName;
+                    _this.addMatchedInputFile(referenceFilePath, /* extensions */ undefined);
+                });
+                // Add import files into language-service host
+                ts.forEach(importedFiles, function (importedFile) {
+                    // Fourslash insert tests/cases/fourslash into inputFile.unitName and import statement doesn't require ".ts"
+                    // so convert them before making appropriate comparison
+                    var importedFilePath = _this.basePath + "/" + importedFile.fileName;
+                    _this.addMatchedInputFile(importedFilePath, ts.getSupportedExtensions(compilationOptions));
+                });
+                // Check if no-default-lib flag is false and if so add default library
+                if (!resolvedResult.isLibFile) {
+                    this.languageServiceAdapterHost.addScript(Harness.Compiler.defaultLibFileName, Harness.Compiler.getDefaultLibrarySourceFile().text, /*isRootFile*/ false);
+                }
+            }
+            else {
+                // resolveReference file-option is not specified then do not resolve any files and include all inputFiles
+                this.inputFiles.forEach(function (file, fileName) {
+                    if (!Harness.isDefaultLibraryFile(fileName)) {
+                        _this.languageServiceAdapterHost.addScript(fileName, file, /*isRootFile*/ true);
+                    }
+                });
+                if (!compilationOptions.noLib) {
+                    this.languageServiceAdapterHost.addScript(Harness.Compiler.defaultLibFileName, Harness.Compiler.getDefaultLibrarySourceFile().text, /*isRootFile*/ false);
+                }
+            }
+            var _loop_3 = function (file) {
+                ts.forEach(file.symlinks, function (link) {
+                    _this.languageServiceAdapterHost.vfs.mkdirpSync(vpath.dirname(link));
+                    _this.languageServiceAdapterHost.vfs.symlinkSync(file.fileName, link);
+                });
+            };
+            for (var _c = 0, _d = testData.files; _c < _d.length; _c++) {
+                var file = _d[_c];
+                _loop_3(file);
+            }
+            this.formatCodeSettings = {
+                baseIndentSize: 0,
+                indentSize: 4,
+                tabSize: 4,
+                newLineCharacter: "\n",
+                convertTabsToSpaces: true,
+                indentStyle: ts.IndentStyle.Smart,
+                insertSpaceAfterCommaDelimiter: true,
+                insertSpaceAfterSemicolonInForStatements: true,
+                insertSpaceBeforeAndAfterBinaryOperators: true,
+                insertSpaceAfterConstructor: false,
+                insertSpaceAfterKeywordsInControlFlowStatements: true,
+                insertSpaceAfterFunctionKeywordForAnonymousFunctions: false,
+                insertSpaceAfterOpeningAndBeforeClosingNonemptyParenthesis: false,
+                insertSpaceAfterOpeningAndBeforeClosingNonemptyBrackets: false,
+                insertSpaceAfterOpeningAndBeforeClosingNonemptyBraces: true,
+                insertSpaceAfterOpeningAndBeforeClosingTemplateStringBraces: false,
+                insertSpaceAfterOpeningAndBeforeClosingJsxExpressionBraces: false,
+                insertSpaceAfterTypeAssertion: false,
+                placeOpenBraceOnNewLineForFunctions: false,
+                placeOpenBraceOnNewLineForControlBlocks: false,
+                insertSpaceBeforeTypeAnnotation: false
+            };
+            // Open the first file by default
+            this.openFile(0);
+            function memoWrap(ls, target) {
+                var cacheableMembers = [
+                    "getCompletionEntryDetails",
+                    "getCompletionEntrySymbol",
+                    "getQuickInfoAtPosition",
+                    "getReferencesAtPosition",
+                    "getDocumentHighlights",
+                ];
+                var proxy = {};
+                var _loop_4 = function (k) {
+                    var key = k;
+                    if (cacheableMembers.indexOf(key) === -1) {
+                        proxy[key] = function () {
+                            var args = [];
+                            for (var _i = 0; _i < arguments.length; _i++) {
+                                args[_i] = arguments[_i];
+                            }
+                            return ls[key].apply(ls, args);
+                        };
+                        return "continue";
+                    }
+                    var memo = Utils.memoize(function (_version, _active, _caret, _selectEnd, _marker) {
+                        var args = [];
+                        for (var _i = 5; _i < arguments.length; _i++) {
+                            args[_i - 5] = arguments[_i];
+                        }
+                        return ls[key].apply(ls, args);
+                    }, function () {
+                        var args = [];
+                        for (var _i = 0; _i < arguments.length; _i++) {
+                            args[_i] = arguments[_i];
+                        }
+                        return args.join("|,|");
+                    });
+                    proxy[key] = function () {
+                        var args = [];
+                        for (var _i = 0; _i < arguments.length; _i++) {
+                            args[_i] = arguments[_i];
+                        }
+                        return memo.apply(void 0, [target.languageServiceAdapterHost.getScriptInfo(target.activeFile.fileName).version,
+                            target.activeFile.fileName,
+                            target.currentCaretPosition,
+                            target.selectionEnd,
+                            target.lastKnownMarker].concat(args));
+                    };
+                };
+                for (var k in ls) {
+                    _loop_4(k);
+                }
+                return proxy;
+            }
+        }
+        TestState.getDisplayPartsJson = function (displayParts) {
+            var result = "";
+            ts.forEach(displayParts, function (part) {
+                if (result) {
+                    result += ",\n    ";
+                }
+                else {
+                    result = "[\n    ";
+                }
+                result += JSON.stringify(part);
+            });
+            if (result) {
+                result += "\n]";
+            }
+            return result;
+        };
+        // Add input file which has matched file name with the given reference-file path.
+        // This is necessary when resolveReference flag is specified
+        TestState.prototype.addMatchedInputFile = function (referenceFilePath, extensions) {
+            var inputFiles = this.inputFiles;
+            var languageServiceAdapterHost = this.languageServiceAdapterHost;
+            var didAdd = tryAdd(referenceFilePath);
+            if (extensions && !didAdd) {
+                ts.forEach(extensions, function (ext) { return tryAdd(referenceFilePath + ext); });
+            }
+            function tryAdd(path) {
+                var inputFile = inputFiles.get(path);
+                if (inputFile && !Harness.isDefaultLibraryFile(path)) {
+                    languageServiceAdapterHost.addScript(path, inputFile, /*isRootFile*/ true);
+                    return true;
+                }
+            }
+        };
+        TestState.prototype.getLanguageServiceAdapter = function (testType, cancellationToken, compilationOptions) {
+            switch (testType) {
+                case 0 /* Native */:
+                    return new Harness.LanguageService.NativeLanguageServiceAdapter(cancellationToken, compilationOptions);
+                case 1 /* Shims */:
+                    return new Harness.LanguageService.ShimLanguageServiceAdapter(/*preprocessToResolve*/ false, cancellationToken, compilationOptions);
+                case 2 /* ShimsWithPreprocess */:
+                    return new Harness.LanguageService.ShimLanguageServiceAdapter(/*preprocessToResolve*/ true, cancellationToken, compilationOptions);
+                case 3 /* Server */:
+                    return new Harness.LanguageService.ServerLanguageServiceAdapter(cancellationToken, compilationOptions);
+                default:
+                    throw new Error("Unknown FourSlash test type: ");
+            }
+        };
+        TestState.prototype.getFileContent = function (fileName) {
+            var script = this.languageServiceAdapterHost.getScriptInfo(fileName);
+            return script.content;
+        };
+        // Entry points from fourslash.ts
+        TestState.prototype.goToMarker = function (name) {
+            if (name === void 0) { name = ""; }
+            var marker = ts.isString(name) ? this.getMarkerByName(name) : name;
+            if (this.activeFile.fileName !== marker.fileName) {
+                this.openFile(marker.fileName);
+            }
+            var content = this.getFileContent(marker.fileName);
+            if (marker.position === -1 || marker.position > content.length) {
+                throw new Error("Marker \"" + name + "\" has been invalidated by unrecoverable edits to the file.");
+            }
+            var mName = ts.isString(name) ? name : this.markerName(marker);
+            this.lastKnownMarker = mName;
+            this.goToPosition(marker.position);
+        };
+        TestState.prototype.goToEachMarker = function (markers, action) {
+            assert(markers.length);
+            for (var i = 0; i < markers.length; i++) {
+                this.goToMarker(markers[i]);
+                action(markers[i], i);
+            }
+        };
+        TestState.prototype.goToEachRange = function (action) {
+            var ranges = this.getRanges();
+            assert(ranges.length);
+            for (var _i = 0, ranges_1 = ranges; _i < ranges_1.length; _i++) {
+                var range = ranges_1[_i];
+                this.selectRange(range);
+                action();
+            }
+        };
+        TestState.prototype.markerName = function (m) {
+            return ts.forEachEntry(this.testData.markerPositions, function (marker, name) {
+                if (marker === m) {
+                    return name;
+                }
+            });
+        };
+        TestState.prototype.goToPosition = function (pos) {
+            this.currentCaretPosition = pos;
+            this.selectionEnd = -1;
+        };
+        TestState.prototype.select = function (startMarker, endMarker) {
+            var start = this.getMarkerByName(startMarker), end = this.getMarkerByName(endMarker);
+            ts.Debug.assert(start.fileName === end.fileName);
+            if (this.activeFile.fileName !== start.fileName) {
+                this.openFile(start.fileName);
+            }
+            this.goToPosition(start.position);
+            this.selectionEnd = end.position;
+        };
+        TestState.prototype.selectRange = function (range) {
+            this.goToRangeStart(range);
+            this.selectionEnd = range.end;
+        };
+        TestState.prototype.moveCaretRight = function (count) {
+            if (count === void 0) { count = 1; }
+            this.currentCaretPosition += count;
+            this.currentCaretPosition = Math.min(this.currentCaretPosition, this.getFileContent(this.activeFile.fileName).length);
+            this.selectionEnd = -1;
+        };
+        // Opens a file given its 0-based index or fileName
+        TestState.prototype.openFile = function (indexOrName, content, scriptKindName) {
+            var fileToOpen = this.findFile(indexOrName);
+            fileToOpen.fileName = ts.normalizeSlashes(fileToOpen.fileName);
+            this.activeFile = fileToOpen;
+            // Let the host know that this file is now open
+            this.languageServiceAdapterHost.openFile(fileToOpen.fileName, content, scriptKindName);
+        };
+        TestState.prototype.verifyErrorExistsBetweenMarkers = function (startMarkerName, endMarkerName, shouldExist) {
+            var startMarker = this.getMarkerByName(startMarkerName);
+            var endMarker = this.getMarkerByName(endMarkerName);
+            var predicate = function (errorMinChar, errorLimChar, startPos, endPos) {
+                return ((errorMinChar === startPos) && (errorLimChar === endPos)) ? true : false;
+            };
+            var exists = this.anyErrorInRange(predicate, startMarker, endMarker);
+            if (exists !== shouldExist) {
+                this.printErrorLog(shouldExist, this.getAllDiagnostics());
+                throw new Error((shouldExist ? "Expected" : "Did not expect") + " failure between markers: '" + startMarkerName + "', '" + endMarkerName + "'");
+            }
+        };
+        TestState.prototype.raiseError = function (message) {
+            throw new Error(this.messageAtLastKnownMarker(message));
+        };
+        TestState.prototype.messageAtLastKnownMarker = function (message) {
+            var locationDescription = this.lastKnownMarker ? this.lastKnownMarker : this.getLineColStringAtPosition(this.currentCaretPosition);
+            return "At " + locationDescription + ": " + message;
+        };
+        TestState.prototype.assertionMessageAtLastKnownMarker = function (msg) {
+            return "\nMarker: " + this.lastKnownMarker + "\nChecking: " + msg + "\n\n";
+        };
+        TestState.prototype.getDiagnostics = function (fileName, includeSuggestions) {
+            if (includeSuggestions === void 0) { includeSuggestions = false; }
+            return this.languageService.getSyntacticDiagnostics(fileName).concat(this.languageService.getSemanticDiagnostics(fileName), (includeSuggestions ? this.languageService.getSuggestionDiagnostics(fileName) : ts.emptyArray));
+        };
+        TestState.prototype.getAllDiagnostics = function () {
+            var _this = this;
+            return ts.flatMap(this.languageServiceAdapterHost.getFilenames(), function (fileName) {
+                return ts.isAnySupportedFileExtension(fileName) ? _this.getDiagnostics(fileName) : [];
+            });
+        };
+        TestState.prototype.verifyErrorExistsAfterMarker = function (markerName, shouldExist, after) {
+            var marker = this.getMarkerByName(markerName);
+            var predicate;
+            if (after) {
+                predicate = function (errorMinChar, errorLimChar, startPos) {
+                    return ((errorMinChar >= startPos) && (errorLimChar >= startPos)) ? true : false;
+                };
+            }
+            else {
+                predicate = function (errorMinChar, errorLimChar, startPos) {
+                    return ((errorMinChar <= startPos) && (errorLimChar <= startPos)) ? true : false;
+                };
+            }
+            var exists = this.anyErrorInRange(predicate, marker);
+            var diagnostics = this.getAllDiagnostics();
+            if (exists !== shouldExist) {
+                this.printErrorLog(shouldExist, diagnostics);
+                throw new Error((shouldExist ? "Expected" : "Did not expect") + " failure at marker '" + markerName + "'");
+            }
+        };
+        TestState.prototype.anyErrorInRange = function (predicate, startMarker, endMarker) {
+            return this.getDiagnostics(startMarker.fileName).some(function (_a) {
+                var start = _a.start, length = _a.length;
+                return predicate(start, start + length, startMarker.position, endMarker === undefined ? undefined : endMarker.position);
+            }); // TODO: GH#18217
+        };
+        TestState.prototype.printErrorLog = function (expectErrors, errors) {
+            if (expectErrors) {
+                Harness.IO.log("Expected error not found.  Error list is:");
+            }
+            else {
+                Harness.IO.log("Unexpected error(s) found.  Error list is:");
+            }
+            for (var _i = 0, errors_1 = errors; _i < errors_1.length; _i++) {
+                var _a = errors_1[_i], start = _a.start, length = _a.length, messageText = _a.messageText, file = _a.file;
+                Harness.IO.log("  " + this.formatRange(file, start, length) + // TODO: GH#18217
+                    ", message: " + ts.flattenDiagnosticMessageText(messageText, Harness.IO.newLine()) + "\n");
+            }
+        };
+        TestState.prototype.formatRange = function (file, start, length) {
+            if (file) {
+                return "from: " + this.formatLineAndCharacterOfPosition(file, start) + ", to: " + this.formatLineAndCharacterOfPosition(file, start + length);
+            }
+            return "global";
+        };
+        TestState.prototype.formatLineAndCharacterOfPosition = function (file, pos) {
+            if (file) {
+                var _a = ts.getLineAndCharacterOfPosition(file, pos), line = _a.line, character = _a.character;
+                return line + ":" + character;
+            }
+            return "global";
+        };
+        TestState.prototype.formatPosition = function (file, pos) {
+            if (file) {
+                return file.fileName + "@" + pos;
+            }
+            return "global";
+        };
+        TestState.prototype.verifyNoErrors = function () {
+            var _this = this;
+            ts.forEachKey(this.inputFiles, function (fileName) {
+                if (!ts.isAnySupportedFileExtension(fileName)
+                    || !_this.getProgram().getCompilerOptions().allowJs && !ts.extensionIsTypeScript(ts.extensionFromPath(fileName)))
+                    return;
+                var errors = _this.getDiagnostics(fileName).filter(function (e) { return e.category !== ts.DiagnosticCategory.Suggestion; });
+                if (errors.length) {
+                    _this.printErrorLog(/*expectErrors*/ false, errors);
+                    var error = errors[0];
+                    _this.raiseError("Found an error: " + _this.formatPosition(error.file, error.start) + ": " + error.messageText);
+                }
+            });
+        };
+        TestState.prototype.verifyNumberOfErrorsInCurrentFile = function (expected) {
+            var errors = this.getDiagnostics(this.activeFile.fileName);
+            var actual = errors.length;
+            if (actual !== expected) {
+                this.printErrorLog(/*expectErrors*/ false, errors);
+                var errorMsg = "Actual number of errors (" + actual + ") does not match expected number (" + expected + ")";
+                Harness.IO.log(errorMsg);
+                this.raiseError(errorMsg);
+            }
+        };
+        TestState.prototype.verifyEval = function (expr, value) {
+            var emit = this.languageService.getEmitOutput(this.activeFile.fileName);
+            if (emit.outputFiles.length !== 1) {
+                throw new Error("Expected exactly one output from emit of " + this.activeFile.fileName);
+            }
+            var evaluation = new Function(emit.outputFiles[0].text + ";\r\nreturn (" + expr + ");")();
+            if (evaluation !== value) {
+                this.raiseError("Expected evaluation of expression \"" + expr + "\" to equal \"" + value + "\", but got \"" + evaluation + "\"");
+            }
+        };
+        TestState.prototype.verifyGoToDefinitionIs = function (endMarker) {
+            var _this = this;
+            this.verifyGoToXWorker(toArray(endMarker), function () { return _this.getGoToDefinition(); });
+        };
+        TestState.prototype.verifyGoToDefinition = function (arg0, endMarkerNames) {
+            var _this = this;
+            this.verifyGoToX(arg0, endMarkerNames, function () { return _this.getGoToDefinitionAndBoundSpan(); });
+        };
+        TestState.prototype.getGoToDefinition = function () {
+            return this.languageService.getDefinitionAtPosition(this.activeFile.fileName, this.currentCaretPosition);
+        };
+        TestState.prototype.getGoToDefinitionAndBoundSpan = function () {
+            return this.languageService.getDefinitionAndBoundSpan(this.activeFile.fileName, this.currentCaretPosition);
+        };
+        TestState.prototype.verifyGoToType = function (arg0, endMarkerNames) {
+            var _this = this;
+            this.verifyGoToX(arg0, endMarkerNames, function () {
+                return _this.languageService.getTypeDefinitionAtPosition(_this.activeFile.fileName, _this.currentCaretPosition);
+            });
+        };
+        TestState.prototype.verifyGoToX = function (arg0, endMarkerNames, getDefs) {
+            if (endMarkerNames) {
+                this.verifyGoToXPlain(arg0, endMarkerNames, getDefs);
+            }
+            else if (ts.isArray(arg0)) {
+                var pairs = arg0;
+                for (var _i = 0, pairs_1 = pairs; _i < pairs_1.length; _i++) {
+                    var _a = pairs_1[_i], start = _a[0], end = _a[1];
+                    this.verifyGoToXPlain(start, end, getDefs);
+                }
+            }
+            else {
+                var obj = arg0;
+                for (var startMarkerName in obj) {
+                    if (ts.hasProperty(obj, startMarkerName)) {
+                        this.verifyGoToXPlain(startMarkerName, obj[startMarkerName], getDefs);
+                    }
+                }
+            }
+        };
+        TestState.prototype.verifyGoToXPlain = function (startMarkerNames, endMarkerNames, getDefs) {
+            for (var _i = 0, _a = toArray(startMarkerNames); _i < _a.length; _i++) {
+                var start = _a[_i];
+                this.verifyGoToXSingle(start, endMarkerNames, getDefs);
+            }
+        };
+        TestState.prototype.verifyGoToDefinitionForMarkers = function (markerNames) {
+            var _this = this;
+            for (var _i = 0, markerNames_1 = markerNames; _i < markerNames_1.length; _i++) {
+                var markerName = markerNames_1[_i];
+                this.verifyGoToXSingle(markerName + "Reference", markerName + "Definition", function () { return _this.getGoToDefinition(); });
+            }
+        };
+        TestState.prototype.verifyGoToXSingle = function (startMarkerName, endMarkerNames, getDefs) {
+            this.goToMarker(startMarkerName);
+            this.verifyGoToXWorker(toArray(endMarkerNames), getDefs, startMarkerName);
+        };
+        TestState.prototype.verifyGoToXWorker = function (endMarkers, getDefs, startMarkerName) {
+            var _this = this;
+            var defs = getDefs();
+            var definitions;
+            var testName;
+            if (!defs || ts.isArray(defs)) {
+                definitions = defs || [];
+                testName = "goToDefinitions";
+            }
+            else {
+                this.verifyDefinitionTextSpan(defs, startMarkerName);
+                definitions = defs.definitions; // TODO: GH#18217
+                testName = "goToDefinitionsAndBoundSpan";
+            }
+            if (endMarkers.length !== definitions.length) {
+                this.raiseError(testName + " failed - expected to find " + endMarkers.length + " definitions but got " + definitions.length);
+            }
+            ts.zipWith(endMarkers, definitions, function (endMarker, definition, i) {
+                var marker = _this.getMarkerByName(endMarker);
+                if (marker.fileName !== definition.fileName || marker.position !== definition.textSpan.start) {
+                    _this.raiseError(testName + " failed for definition " + endMarker + " (" + i + "): expected " + marker.fileName + " at " + marker.position + ", got " + definition.fileName + " at " + definition.textSpan.start);
+                }
+            });
+        };
+        TestState.prototype.verifyDefinitionTextSpan = function (defs, startMarkerName) {
+            var _this = this;
+            var range = this.testData.ranges.find(function (range) { return _this.markerName(range.marker) === startMarkerName; });
+            if (!range && !defs.textSpan) {
+                return;
+            }
+            if (!range) {
+                this.raiseError("goToDefinitionsAndBoundSpan failed - found a TextSpan " + JSON.stringify(defs.textSpan) + " when it wasn't expected.");
+            }
+            else if (defs.textSpan.start !== range.pos || defs.textSpan.length !== range.end - range.pos) {
+                var expected = {
+                    start: range.pos, length: range.end - range.pos
+                };
+                this.raiseError("goToDefinitionsAndBoundSpan failed - expected to find TextSpan " + JSON.stringify(expected) + " but got " + JSON.stringify(defs.textSpan));
+            }
+        };
+        TestState.prototype.verifyGetEmitOutputForCurrentFile = function (expected) {
+            var emit = this.languageService.getEmitOutput(this.activeFile.fileName);
+            if (emit.outputFiles.length !== 1) {
+                throw new Error("Expected exactly one output from emit of " + this.activeFile.fileName);
+            }
+            var actual = emit.outputFiles[0].text;
+            if (actual !== expected) {
+                this.raiseError("Expected emit output to be \"" + expected + "\", but got \"" + actual + "\"");
+            }
+        };
+        TestState.prototype.verifyGetEmitOutputContentsForCurrentFile = function (expected) {
+            var emit = this.languageService.getEmitOutput(this.activeFile.fileName);
+            assert.equal(emit.outputFiles.length, expected.length, "Number of emit output files");
+            ts.zipWith(emit.outputFiles, expected, function (outputFile, expected) {
+                assert.equal(outputFile.name, expected.name, "FileName");
+                assert.equal(outputFile.text, expected.text, "Content");
+            });
+        };
+        TestState.prototype.verifyCompletionListCount = function (expectedCount, negative) {
+            if (expectedCount === 0 && negative) {
+                this.verifyCompletionListIsEmpty(/*negative*/ false);
+                return;
+            }
+            var members = this.getCompletionListAtCaret();
+            if (members) {
+                var match = members.entries.length === expectedCount;
+                if ((!match && !negative) || (match && negative)) {
+                    this.raiseError("Member list count was " + members.entries.length + ". Expected " + expectedCount);
+                }
+            }
+            else if (expectedCount) {
+                this.raiseError("Member list count was 0. Expected " + expectedCount);
+            }
+        };
+        TestState.prototype.verifyCompletionListItemsCountIsGreaterThan = function (count, negative) {
+            var completions = this.getCompletionListAtCaret();
+            var itemsCount = completions ? completions.entries.length : 0;
+            if (negative) {
+                if (itemsCount > count) {
+                    this.raiseError("Expected completion list items count to not be greater than " + count + ", but is actually " + itemsCount);
+                }
+            }
+            else {
+                if (itemsCount <= count) {
+                    this.raiseError("Expected completion list items count to be greater than " + count + ", but is actually " + itemsCount);
+                }
+            }
+        };
+        TestState.prototype.verifyCompletionListStartsWithItemsInOrder = function (items) {
+            if (items.length === 0) {
+                return;
+            }
+            var entries = this.getCompletionListAtCaret().entries;
+            assert.isTrue(items.length <= entries.length, "Amount of expected items in completion list [ " + items.length + " ] is greater than actual number of items in list [ " + entries.length + " ]");
+            ts.zipWith(entries, items, function (entry, item) {
+                assert.equal(entry.name, item, "Unexpected item in completion list");
+            });
+        };
+        TestState.prototype.noItemsWithSameNameButDifferentKind = function () {
+            var completions = this.getCompletionListAtCaret();
+            var uniqueItems = ts.createMap();
+            for (var _i = 0, _a = completions.entries; _i < _a.length; _i++) {
+                var item = _a[_i];
+                var uniqueItem = uniqueItems.get(item.name);
+                if (!uniqueItem) {
+                    uniqueItems.set(item.name, item.kind);
+                }
+                else {
+                    assert.equal(item.kind, uniqueItem, "Items should have the same kind, got " + item.kind + " and " + uniqueItem);
+                }
+            }
+        };
+        TestState.prototype.verifyCompletionListIsEmpty = function (negative) {
+            var completions = this.getCompletionListAtCaret();
+            if ((!completions || completions.entries.length === 0) && negative) {
+                this.raiseError("Completion list is empty at caret at position " + this.activeFile.fileName + " " + this.currentCaretPosition);
+            }
+            else if (completions && completions.entries.length !== 0 && !negative) {
+                this.raiseError("Completion list is not empty at caret at position " + this.activeFile.fileName + " " + this.currentCaretPosition + "\n" +
+                    ("Completion List contains: " + stringify(completions.entries.map(function (e) { return e.name; }))));
+            }
+        };
+        TestState.prototype.verifyCompletionListAllowsNewIdentifier = function (negative) {
+            var completions = this.getCompletionListAtCaret();
+            if ((completions && !completions.isNewIdentifierLocation) && !negative) {
+                this.raiseError("Expected builder completion entry");
+            }
+            else if ((completions && completions.isNewIdentifierLocation) && negative) {
+                this.raiseError("Un-expected builder completion entry");
+            }
+        };
+        TestState.prototype.verifyCompletionListIsGlobal = function (expected) {
+            var completions = this.getCompletionListAtCaret();
+            if (completions && completions.isGlobalCompletion !== expected) {
+                this.raiseError("verifyCompletionListIsGlobal failed - expected result to be " + completions.isGlobalCompletion);
+            }
+        };
+        TestState.prototype.verifyCompletions = function (options) {
+            if (options.marker === undefined) {
+                this.verifyCompletionsWorker(options);
+            }
+            else {
+                for (var _i = 0, _a = toArray(options.marker); _i < _a.length; _i++) {
+                    var marker = _a[_i];
+                    this.goToMarker(marker);
+                    this.verifyCompletionsWorker(options);
+                }
+            }
+        };
+        TestState.prototype.verifyCompletionsWorker = function (options) {
+            var actualCompletions = this.getCompletionListAtCaret(__assign({}, options.preferences, { triggerCharacter: options.triggerCharacter }));
+            if (!actualCompletions) {
+                if (options.exact === undefined)
+                    return;
+                this.raiseError("No completions at position '" + this.currentCaretPosition + "'.");
+            }
+            if (actualCompletions.isNewIdentifierLocation !== (options.isNewIdentifierLocation || false)) {
+                this.raiseError("Expected 'isNewIdentifierLocation' to be " + (options.isNewIdentifierLocation || false) + ", got " + actualCompletions.isNewIdentifierLocation);
+            }
+            var actualByName = ts.createMap();
+            var _loop_5 = function (entry) {
+                if (actualByName.has(entry.name)) {
+                    // TODO: GH#23587
+                    if (entry.name !== "undefined" && entry.name !== "require")
+                        this_1.raiseError("Duplicate (" + actualCompletions.entries.filter(function (a) { return a.name === entry.name; }).length + ") completions for " + entry.name);
+                }
+                else {
+                    actualByName.set(entry.name, entry);
+                }
+            };
+            var this_1 = this;
+            for (var _i = 0, _a = actualCompletions.entries; _i < _a.length; _i++) {
+                var entry = _a[_i];
+                _loop_5(entry);
+            }
+            if ("exact" in options) {
+                ts.Debug.assert(!("includes" in options) && !("excludes" in options));
+                if (options.exact === undefined)
+                    throw this.raiseError("Expected no completions");
+                this.verifyCompletionsAreExactly(actualCompletions.entries, toArray(options.exact));
+            }
+            else {
+                if (options.includes) {
+                    for (var _b = 0, _c = toArray(options.includes); _b < _c.length; _b++) {
+                        var include = _c[_b];
+                        var name = typeof include === "string" ? include : include.name;
+                        var found = actualByName.get(name);
+                        if (!found)
+                            throw this.raiseError("No completion " + name + " found");
+                        this.verifyCompletionEntry(found, include);
+                    }
+                }
+                if (options.excludes) {
+                    for (var _d = 0, _e = toArray(options.excludes); _d < _e.length; _d++) {
+                        var exclude = _e[_d];
+                        if (typeof exclude === "string") {
+                            if (actualByName.has(exclude)) {
+                                this.raiseError("Did not expect to get a completion named " + exclude);
+                            }
+                        }
+                        else {
+                            var found = actualByName.get(exclude.name);
+                            if (found && found.source === exclude.source) {
+                                this.raiseError("Did not expect to get a completion named " + exclude.name + " with source " + exclude.source);
+                            }
+                        }
+                    }
+                }
+            }
+        };
+        TestState.prototype.verifyCompletionEntry = function (actual, expected) {
+            var _a = typeof expected === "string"
+                ? { insertText: undefined, replacementSpan: undefined, hasAction: undefined, isRecommended: undefined, kind: undefined, text: undefined, documentation: undefined, sourceDisplay: undefined }
+                : expected, insertText = _a.insertText, replacementSpan = _a.replacementSpan, hasAction = _a.hasAction, isRecommended = _a.isRecommended, kind = _a.kind, text = _a.text, documentation = _a.documentation, sourceDisplay = _a.sourceDisplay;
+            if (actual.insertText !== insertText) {
+                this.raiseError("Expected completion insert text to be " + insertText + ", got " + actual.insertText);
+            }
+            var convertedReplacementSpan = replacementSpan && ts.createTextSpanFromRange(replacementSpan);
+            try {
+                assert.deepEqual(actual.replacementSpan, convertedReplacementSpan);
+            }
+            catch (_b) {
+                this.raiseError("Expected completion replacementSpan to be " + stringify(convertedReplacementSpan) + ", got " + stringify(actual.replacementSpan));
+            }
+            if (kind !== undefined)
+                assert.equal(actual.kind, kind);
+            assert.equal(actual.hasAction, hasAction);
+            assert.equal(actual.isRecommended, isRecommended);
+            if (text) {
+                var actualDetails = this.getCompletionEntryDetails(actual.name, actual.source);
+                assert.equal(ts.displayPartsToString(actualDetails.displayParts), text);
+                assert.equal(ts.displayPartsToString(actualDetails.documentation), documentation || "");
+                // TODO: GH#23587
+                // assert.equal(actualDetails.kind, actual.kind);
+                assert.equal(actualDetails.kindModifiers, actual.kindModifiers);
+                assert.equal(actualDetails.source && ts.displayPartsToString(actualDetails.source), sourceDisplay);
+            }
+            else {
+                assert(documentation === undefined && sourceDisplay === undefined, "If specifying completion details, should specify 'text'");
+            }
+        };
+        TestState.prototype.verifyCompletionsAreExactly = function (actual, expected) {
+            var _this = this;
+            if (actual.length !== expected.length) {
+                this.raiseError("Expected " + expected.length + " completions, got " + actual.length + " (" + actual.map(function (a) { return a.name; }) + ").");
+            }
+            ts.zipWith(actual, expected, function (completion, expectedCompletion, index) {
+                var name = typeof expectedCompletion === "string" ? expectedCompletion : expectedCompletion.name;
+                if (completion.name !== name) {
+                    _this.raiseError("Expected completion at index " + index + " to be " + name + ", got " + completion.name);
+                }
+                _this.verifyCompletionEntry(completion, expectedCompletion);
+            });
+        };
+        TestState.prototype.verifyCompletionsAt = function (markerName, expected, options) {
+            this.verifyCompletions({
+                marker: markerName,
+                exact: expected,
+                isNewIdentifierLocation: options && options.isNewIdentifierLocation,
+                preferences: options,
+                triggerCharacter: options && options.triggerCharacter,
+            });
+        };
+        TestState.prototype.verifyCompletionListContains = function (entryId, text, documentation, kind, spanIndex, hasAction, options) {
+            var completions = this.getCompletionListAtCaret(options);
+            if (completions) {
+                this.assertItemInCompletionList(completions.entries, entryId, text, documentation, kind, spanIndex, hasAction, options);
+            }
+            else {
+                this.raiseError("No completions at position '" + this.currentCaretPosition + "' when looking for '" + JSON.stringify(entryId) + "'.");
+            }
+        };
+        /**
+         * Verify that the completion list does NOT contain the given symbol.
+         * The symbol is considered matched with the symbol in the list if and only if all given parameters must matched.
+         * When any parameter is omitted, the parameter is ignored during comparison and assumed that the parameter with
+         * that property of the symbol in the list.
+         * @param symbol the name of symbol
+         * @param expectedText the text associated with the symbol
+         * @param expectedDocumentation the documentation text associated with the symbol
+         * @param expectedKind the kind of symbol (see ScriptElementKind)
+         * @param spanIndex the index of the range that the completion item's replacement text span should match
+         */
+        TestState.prototype.verifyCompletionListDoesNotContain = function (entryId, expectedText, expectedDocumentation, expectedKind, spanIndex, options) {
+            var _this = this;
+            var replacementSpan;
+            if (spanIndex !== undefined) {
+                replacementSpan = this.getTextSpanForRangeAtIndex(spanIndex);
+            }
+            var completions = this.getCompletionListAtCaret(options);
+            if (completions) {
+                var filterCompletions = completions.entries.filter(function (e) { return e.name === entryId.name && e.source === entryId.source; });
+                filterCompletions = expectedKind ? filterCompletions.filter(function (e) { return e.kind === expectedKind || (typeof expectedKind === "object" && e.kind === expectedKind.kind); }) : filterCompletions;
+                filterCompletions = filterCompletions.filter(function (entry) {
+                    var details = _this.getCompletionEntryDetails(entry.name);
+                    var documentation = details && ts.displayPartsToString(details.documentation);
+                    var text = details && ts.displayPartsToString(details.displayParts);
+                    // If any of the expected values are undefined, assume that users don't
+                    // care about them.
+                    if (replacementSpan && !TestState.textSpansEqual(replacementSpan, entry.replacementSpan)) {
+                        return false;
+                    }
+                    else if (expectedText && text !== expectedText) {
+                        return false;
+                    }
+                    else if (expectedDocumentation && documentation !== expectedDocumentation) {
+                        return false;
+                    }
+                    return true;
+                });
+                if (filterCompletions.length !== 0) {
+                    // After filtered using all present criterion, if there are still symbol left in the list
+                    // then these symbols must meet the criterion for Not supposed to be in the list. So we
+                    // raise an error
+                    var error = "Completion list did contain '" + JSON.stringify(entryId) + "'.";
+                    var details = this.getCompletionEntryDetails(filterCompletions[0].name);
+                    if (expectedText) {
+                        error += "Expected text: " + expectedText + " to equal: " + ts.displayPartsToString(details.displayParts) + ".";
+                    }
+                    if (expectedDocumentation) {
+                        error += "Expected documentation: " + expectedDocumentation + " to equal: " + ts.displayPartsToString(details.documentation) + ".";
+                    }
+                    if (expectedKind) {
+                        error += "Expected kind: " + expectedKind + " to equal: " + filterCompletions[0].kind + ".";
+                    }
+                    else {
+                        error += "kind: " + filterCompletions[0].kind + ".";
+                    }
+                    if (replacementSpan) {
+                        var spanText = filterCompletions[0].replacementSpan ? stringify(filterCompletions[0].replacementSpan) : undefined;
+                        error += "Expected replacement span: " + stringify(replacementSpan) + " to equal: " + spanText + ".";
+                    }
+                    this.raiseError(error);
+                }
+            }
+        };
+        TestState.prototype.verifyCompletionEntryDetails = function (entryName, expectedText, expectedDocumentation, kind, tags) {
+            var _this = this;
+            var details = this.getCompletionEntryDetails(entryName);
+            assert(details, "no completion entry available");
+            assert.equal(ts.displayPartsToString(details.displayParts), expectedText, this.assertionMessageAtLastKnownMarker("completion entry details text"));
+            if (expectedDocumentation !== undefined) {
+                assert.equal(ts.displayPartsToString(details.documentation), expectedDocumentation, this.assertionMessageAtLastKnownMarker("completion entry documentation"));
+            }
+            if (kind !== undefined) {
+                assert.equal(details.kind, kind, this.assertionMessageAtLastKnownMarker("completion entry kind"));
+            }
+            if (tags !== undefined) {
+                assert.equal(details.tags.length, tags.length, this.messageAtLastKnownMarker("QuickInfo tags"));
+                ts.zipWith(tags, details.tags, function (expectedTag, actualTag) {
+                    assert.equal(actualTag.name, expectedTag.name);
+                    assert.equal(actualTag.text, expectedTag.text, _this.messageAtLastKnownMarker("QuickInfo tag " + actualTag.name));
+                });
+            }
+        };
+        TestState.prototype.getProgram = function () {
+            return this._program || (this._program = this.languageService.getProgram()); // TODO: GH#18217
+        };
+        TestState.prototype.getChecker = function () {
+            return this._checker || (this._checker = this.getProgram().getTypeChecker());
+        };
+        TestState.prototype.getSourceFile = function () {
+            var fileName = this.activeFile.fileName;
+            var result = this.getProgram().getSourceFile(fileName);
+            if (!result) {
+                throw new Error("Could not get source file " + fileName);
+            }
+            return result;
+        };
+        TestState.prototype.getNode = function () {
+            return ts.getTouchingPropertyName(this.getSourceFile(), this.currentCaretPosition);
+        };
+        TestState.prototype.goToAndGetNode = function (range) {
+            this.goToRangeStart(range);
+            var node = this.getNode();
+            this.verifyRange("touching property name", range, node);
+            return node;
+        };
+        TestState.prototype.verifyRange = function (desc, expected, actual) {
+            var actualStart = actual.getStart();
+            var actualEnd = actual.getEnd();
+            if (actualStart !== expected.pos || actualEnd !== expected.end) {
+                this.raiseError(desc + " should be " + expected.pos + "-" + expected.end + ", got " + actualStart + "-" + actualEnd);
+            }
+        };
+        TestState.prototype.verifySymbol = function (symbol, declarationRanges) {
+            var _this = this;
+            var declarations = symbol.declarations;
+            if (declarations.length !== declarationRanges.length) {
+                this.raiseError("Expected to get " + declarationRanges.length + " declarations, got " + declarations.length);
+            }
+            ts.zipWith(declarations, declarationRanges, function (decl, range) {
+                _this.verifyRange("symbol declaration", range, decl);
+            });
+        };
+        TestState.prototype.verifySymbolAtLocation = function (startRange, declarationRanges) {
+            var node = this.goToAndGetNode(startRange);
+            var symbol = this.getChecker().getSymbolAtLocation(node);
+            if (!symbol) {
+                this.raiseError("Could not get symbol at location");
+            }
+            this.verifySymbol(symbol, declarationRanges);
+        };
+        TestState.prototype.symbolsInScope = function (range) {
+            var node = this.goToAndGetNode(range);
+            return this.getChecker().getSymbolsInScope(node, 67216319 /* Value */ | 67901928 /* Type */ | 1920 /* Namespace */);
+        };
+        TestState.prototype.setTypesRegistry = function (map) {
+            this.languageServiceAdapterHost.typesRegistry = ts.createMapFromTemplate(map);
+        };
+        TestState.prototype.verifyTypeOfSymbolAtLocation = function (range, symbol, expected) {
+            var node = this.goToAndGetNode(range);
+            var checker = this.getChecker();
+            var type = checker.getTypeOfSymbolAtLocation(symbol, node);
+            var actual = checker.typeToString(type);
+            if (actual !== expected) {
+                this.raiseError("Expected: '" + expected + "', actual: '" + actual + "'");
+            }
+        };
+        TestState.prototype.verifyDocumentHighlightsRespectFilesList = function (files) {
+            var startFile = this.activeFile.fileName;
+            var _loop_6 = function (fileName) {
+                var searchFileNames = startFile === fileName ? [startFile] : [startFile, fileName];
+                var highlights = this_2.getDocumentHighlightsAtCurrentPosition(searchFileNames);
+                if (!highlights.every(function (dh) { return ts.contains(searchFileNames, dh.fileName); })) {
+                    this_2.raiseError("When asking for document highlights only in files " + searchFileNames + ", got document highlights in " + unique(highlights, function (dh) { return dh.fileName; }));
+                }
+            };
+            var this_2 = this;
+            for (var _i = 0, files_3 = files; _i < files_3.length; _i++) {
+                var fileName = files_3[_i];
+                _loop_6(fileName);
+            }
+        };
+        TestState.prototype.verifyReferenceGroups = function (starts, parts) {
+            var fullExpected = ts.map(parts, function (_a) {
+                var definition = _a.definition, ranges = _a.ranges;
+                return ({
+                    definition: typeof definition === "string" ? definition : __assign({}, definition, { range: ts.createTextSpanFromRange(definition.range) }),
+                    references: ranges.map(function (r) {
+                        var _a = (r.marker && r.marker.data || {}), _b = _a.isWriteAccess, isWriteAccess = _b === void 0 ? false : _b, _c = _a.isDefinition, isDefinition = _c === void 0 ? false : _c, isInString = _a.isInString;
+                        return __assign({ fileName: r.fileName, textSpan: ts.createTextSpanFromRange(r), isWriteAccess: isWriteAccess,
+                            isDefinition: isDefinition }, (isInString ? { isInString: true } : undefined));
+                    }),
+                });
+            });
+            for (var _i = 0, _a = toArray(starts); _i < _a.length; _i++) {
+                var start = _a[_i];
+                if (typeof start === "string") {
+                    this.goToMarker(start);
+                }
+                else {
+                    this.goToRangeStart(start);
+                }
+                var fullActual = ts.map(this.findReferencesAtCaret(), function (_a, i) {
+                    var definition = _a.definition, references = _a.references;
+                    var text = definition.displayParts.map(function (d) { return d.text; }).join("");
+                    return {
+                        definition: fullExpected.length > i && typeof fullExpected[i].definition === "string" ? text : { text: text, range: definition.textSpan },
+                        references: references,
+                    };
+                });
+                this.assertObjectsEqual(fullActual, fullExpected);
+                if (parts) {
+                    this.verifyDocumentHighlightsRespectFilesList(unique(ts.flatMap(parts, function (p) { return p.ranges; }), function (r) { return r.fileName; }));
+                }
+            }
+        };
+        TestState.prototype.verifyNoReferences = function (markerNameOrRange) {
+            if (markerNameOrRange) {
+                if (ts.isString(markerNameOrRange)) {
+                    this.goToMarker(markerNameOrRange);
+                }
+                else {
+                    this.goToRangeStart(markerNameOrRange);
+                }
+            }
+            var refs = this.getReferencesAtCaret();
+            if (refs && refs.length) {
+                this.raiseError("Expected getReferences to fail, but saw references: " + stringify(refs));
+            }
+        };
+        // Necessary to have this function since `findReferences` isn't implemented in `client.ts`
+        TestState.prototype.verifyGetReferencesForServerTest = function (expected) {
+            var refs = this.getReferencesAtCaret();
+            assert.deepEqual(refs, expected);
+        };
+        TestState.prototype.verifySingleReferenceGroup = function (definition, ranges) {
+            ranges = ranges || this.getRanges();
+            this.verifyReferenceGroups(ranges, [{ definition: definition, ranges: ranges }]);
+        };
+        TestState.prototype.assertObjectsEqual = function (fullActual, fullExpected, msgPrefix) {
+            var _this = this;
+            if (msgPrefix === void 0) { msgPrefix = ""; }
+            var recur = function (actual, expected, path) {
+                var fail = function (msg) {
+                    _this.raiseError(msgPrefix + " At " + path + ": " + msg + "\nExpected: " + stringify(fullExpected) + "\nActual: " + stringify(fullActual));
+                };
+                if ((actual === undefined) !== (expected === undefined)) {
+                    fail("Expected " + expected + ", got " + actual);
+                }
+                for (var key in actual) {
+                    if (ts.hasProperty(actual, key)) {
+                        var ak = actual[key], ek = expected[key];
+                        if (typeof ak === "object" && typeof ek === "object") {
+                            recur(ak, ek, path ? path + "." + key : key);
+                        }
+                        else if (ak !== ek) {
+                            fail("Expected '" + key + "' to be '" + ek + "', got '" + ak + "'");
+                        }
+                    }
+                }
+                for (var key in expected) {
+                    if (ts.hasProperty(expected, key)) {
+                        if (!ts.hasProperty(actual, key)) {
+                            fail(msgPrefix + "Missing property '" + key + "'");
+                        }
+                    }
+                }
+            };
+            if (fullActual === undefined || fullExpected === undefined) {
+                if (fullActual === fullExpected) {
+                    return;
+                }
+                this.raiseError(msgPrefix + "\nExpected: " + stringify(fullExpected) + "\nActual: " + stringify(fullActual));
+            }
+            recur(fullActual, fullExpected, "");
+        };
+        TestState.prototype.verifyDisplayPartsOfReferencedSymbol = function (expected) {
+            var referencedSymbols = this.findReferencesAtCaret();
+            if (referencedSymbols.length === 0) {
+                this.raiseError("No referenced symbols found at current caret position");
+            }
+            else if (referencedSymbols.length > 1) {
+                this.raiseError("More than one referenced symbol found");
+            }
+            assert.equal(TestState.getDisplayPartsJson(referencedSymbols[0].definition.displayParts), TestState.getDisplayPartsJson(expected), this.messageAtLastKnownMarker("referenced symbol definition display parts"));
+        };
+        TestState.prototype.getCompletionListAtCaret = function (options) {
+            return this.languageService.getCompletionsAtPosition(this.activeFile.fileName, this.currentCaretPosition, options);
+        };
+        TestState.prototype.getCompletionEntryDetails = function (entryName, source, preferences) {
+            return this.languageService.getCompletionEntryDetails(this.activeFile.fileName, this.currentCaretPosition, entryName, this.formatCodeSettings, source, preferences);
+        };
+        TestState.prototype.getReferencesAtCaret = function () {
+            return this.languageService.getReferencesAtPosition(this.activeFile.fileName, this.currentCaretPosition);
+        };
+        TestState.prototype.findReferencesAtCaret = function () {
+            return this.languageService.findReferences(this.activeFile.fileName, this.currentCaretPosition);
+        };
+        TestState.prototype.getSyntacticDiagnostics = function (expected) {
+            var diagnostics = this.languageService.getSyntacticDiagnostics(this.activeFile.fileName);
+            this.testDiagnostics(expected, diagnostics, "error");
+        };
+        TestState.prototype.getSemanticDiagnostics = function (expected) {
+            var diagnostics = this.languageService.getSemanticDiagnostics(this.activeFile.fileName);
+            this.testDiagnostics(expected, diagnostics, "error");
+        };
+        TestState.prototype.getSuggestionDiagnostics = function (expected) {
+            this.testDiagnostics(expected, this.languageService.getSuggestionDiagnostics(this.activeFile.fileName), "suggestion");
+        };
+        TestState.prototype.testDiagnostics = function (expected, diagnostics, category) {
+            var _this = this;
+            assert.deepEqual(ts.realizeDiagnostics(diagnostics, "\n"), expected.map(function (e) { return (__assign({ message: e.message, category: category, code: e.code }, ts.createTextSpanFromRange(e.range || _this.getRanges()[0]), { reportsUnnecessary: e.reportsUnnecessary })); }));
+        };
+        TestState.prototype.verifyQuickInfoAt = function (markerName, expectedText, expectedDocumentation) {
+            this.goToMarker(markerName);
+            this.verifyQuickInfoString(expectedText, expectedDocumentation);
+        };
+        TestState.prototype.verifyQuickInfos = function (namesAndTexts) {
+            for (var name in namesAndTexts) {
+                if (ts.hasProperty(namesAndTexts, name)) {
+                    var text = namesAndTexts[name];
+                    if (ts.isArray(text)) {
+                        assert(text.length === 2);
+                        var expectedText = text[0], expectedDocumentation = text[1];
+                        this.verifyQuickInfoAt(name, expectedText, expectedDocumentation);
+                    }
+                    else {
+                        this.verifyQuickInfoAt(name, text);
+                    }
+                }
+            }
+        };
+        TestState.prototype.verifyQuickInfoString = function (expectedText, expectedDocumentation) {
+            if (expectedDocumentation === "") {
+                throw new Error("Use 'undefined' instead");
+            }
+            var actualQuickInfo = this.languageService.getQuickInfoAtPosition(this.activeFile.fileName, this.currentCaretPosition);
+            var actualQuickInfoText = actualQuickInfo ? ts.displayPartsToString(actualQuickInfo.displayParts) : "";
+            var actualQuickInfoDocumentation = actualQuickInfo ? ts.displayPartsToString(actualQuickInfo.documentation) : "";
+            assert.equal(actualQuickInfoText, expectedText, this.messageAtLastKnownMarker("quick info text"));
+            assert.equal(actualQuickInfoDocumentation, expectedDocumentation || "", this.assertionMessageAtLastKnownMarker("quick info doc"));
+        };
+        TestState.prototype.verifyQuickInfoDisplayParts = function (kind, kindModifiers, textSpan, displayParts, documentation, tags) {
+            var _this = this;
+            var actualQuickInfo = this.languageService.getQuickInfoAtPosition(this.activeFile.fileName, this.currentCaretPosition);
+            assert.equal(actualQuickInfo.kind, kind, this.messageAtLastKnownMarker("QuickInfo kind"));
+            assert.equal(actualQuickInfo.kindModifiers, kindModifiers, this.messageAtLastKnownMarker("QuickInfo kindModifiers"));
+            assert.equal(JSON.stringify(actualQuickInfo.textSpan), JSON.stringify(textSpan), this.messageAtLastKnownMarker("QuickInfo textSpan"));
+            assert.equal(TestState.getDisplayPartsJson(actualQuickInfo.displayParts), TestState.getDisplayPartsJson(displayParts), this.messageAtLastKnownMarker("QuickInfo displayParts"));
+            assert.equal(TestState.getDisplayPartsJson(actualQuickInfo.documentation), TestState.getDisplayPartsJson(documentation), this.messageAtLastKnownMarker("QuickInfo documentation"));
+            assert.equal(actualQuickInfo.tags.length, tags.length, this.messageAtLastKnownMarker("QuickInfo tags"));
+            ts.zipWith(tags, actualQuickInfo.tags, function (expectedTag, actualTag) {
+                assert.equal(expectedTag.name, actualTag.name);
+                assert.equal(expectedTag.text, actualTag.text, _this.messageAtLastKnownMarker("QuickInfo tag " + actualTag.name));
+            });
+        };
+        TestState.prototype.verifyRangesAreRenameLocations = function (options) {
+            if (ts.isArray(options)) {
+                this.verifyRenameLocations(options, options);
+            }
+            else {
+                var ranges = options && options.ranges || this.getRanges();
+                this.verifyRenameLocations(ranges, __assign({ ranges: ranges }, options));
+            }
+        };
+        TestState.prototype.verifyRenameLocations = function (startRanges, options) {
+            var _this = this;
+            var findInStrings, findInComments, ranges;
+            if (ts.isArray(options)) {
+                findInStrings = findInComments = false;
+                ranges = options;
+            }
+            else {
+                findInStrings = !!options.findInStrings;
+                findInComments = !!options.findInComments;
+                ranges = options.ranges;
+            }
+            var _loop_7 = function (startRange) {
+                this_3.goToRangeStart(startRange);
+                var renameInfo = this_3.languageService.getRenameInfo(this_3.activeFile.fileName, this_3.currentCaretPosition);
+                if (!renameInfo.canRename) {
+                    this_3.raiseError("Expected rename to succeed, but it actually failed.");
+                    return "break";
+                }
+                var references = this_3.languageService.findRenameLocations(this_3.activeFile.fileName, this_3.currentCaretPosition, findInStrings, findInComments);
+                ranges = ranges || this_3.getRanges();
+                if (!references) {
+                    if (ranges.length !== 0) {
+                        this_3.raiseError("Expected " + ranges.length + " rename locations; got none.");
+                    }
+                    return { value: void 0 };
+                }
+                if (ranges.length !== references.length) {
+                    this_3.raiseError("Rename location count does not match result.\n\nExpected: " + stringify(ranges) + "\n\nActual:" + stringify(references));
+                }
+                ranges = ranges.sort(function (r1, r2) { return r1.pos - r2.pos; });
+                references = references.sort(function (r1, r2) { return r1.textSpan.start - r2.textSpan.start; });
+                ts.zipWith(references, ranges, function (reference, range) {
+                    if (reference.textSpan.start !== range.pos || ts.textSpanEnd(reference.textSpan) !== range.end) {
+                        _this.raiseError("Rename location results do not match.\n\nExpected: " + stringify(ranges) + "\n\nActual:" + stringify(references));
+                    }
+                });
+            };
+            var this_3 = this;
+            for (var _i = 0, _a = toArray(startRanges); _i < _a.length; _i++) {
+                var startRange = _a[_i];
+                var state_1 = _loop_7(startRange);
+                if (typeof state_1 === "object")
+                    return state_1.value;
+                if (state_1 === "break")
+                    break;
+            }
+        };
+        TestState.prototype.verifyQuickInfoExists = function (negative) {
+            var actualQuickInfo = this.languageService.getQuickInfoAtPosition(this.activeFile.fileName, this.currentCaretPosition);
+            if (negative) {
+                if (actualQuickInfo) {
+                    this.raiseError("verifyQuickInfoExists failed. Expected quick info NOT to exist");
+                }
+            }
+            else {
+                if (!actualQuickInfo) {
+                    this.raiseError("verifyQuickInfoExists failed. Expected quick info to exist");
+                }
+            }
+        };
+        TestState.prototype.verifyNoSignatureHelp = function (markers) {
+            if (markers.length) {
+                for (var _i = 0, markers_1 = markers; _i < markers_1.length; _i++) {
+                    var marker = markers_1[_i];
+                    this.goToMarker(marker);
+                    this.verifyNoSignatureHelp(ts.emptyArray);
+                }
+                return;
+            }
+            var actual = this.getSignatureHelp();
+            if (actual) {
+                this.raiseError("Expected no signature help, but got \"" + stringify(actual) + "\"");
+            }
+        };
+        TestState.prototype.verifySignatureHelp = function (optionses) {
+            for (var _i = 0, optionses_1 = optionses; _i < optionses_1.length; _i++) {
+                var options = optionses_1[_i];
+                if (options.marker === undefined) {
+                    this.verifySignatureHelpWorker(options);
+                }
+                else {
+                    for (var _a = 0, _b = toArray(options.marker); _a < _b.length; _a++) {
+                        var marker = _b[_a];
+                        this.goToMarker(marker);
+                        this.verifySignatureHelpWorker(options);
+                    }
+                }
+            }
+        };
+        TestState.prototype.verifySignatureHelpWorker = function (options) {
+            var _this = this;
+            var help = this.getSignatureHelp();
+            var selectedItem = help.items[help.selectedItemIndex];
+            // Argument index may exceed number of parameters
+            var currentParameter = selectedItem.parameters[help.argumentIndex];
+            assert.equal(help.items.length, options.overloadsCount || 1, this.assertionMessageAtLastKnownMarker("signature help overloads count"));
+            assert.equal(ts.displayPartsToString(selectedItem.documentation), options.docComment || "", this.assertionMessageAtLastKnownMarker("current signature help doc comment"));
+            if (options.text !== undefined) {
+                assert.equal(ts.displayPartsToString(selectedItem.prefixDisplayParts) +
+                    selectedItem.parameters.map(function (p) { return ts.displayPartsToString(p.displayParts); }).join(ts.displayPartsToString(selectedItem.separatorDisplayParts)) +
+                    ts.displayPartsToString(selectedItem.suffixDisplayParts), options.text);
+            }
+            if (options.parameterName !== undefined) {
+                assert.equal(currentParameter.name, options.parameterName);
+            }
+            if (options.parameterSpan !== undefined) {
+                assert.equal(ts.displayPartsToString(currentParameter.displayParts), options.parameterSpan);
+            }
+            if (currentParameter) {
+                assert.equal(ts.displayPartsToString(currentParameter.documentation), options.parameterDocComment || "", this.assertionMessageAtLastKnownMarker("current parameter Help DocComment"));
+            }
+            if (options.parameterCount !== undefined) {
+                assert.equal(selectedItem.parameters.length, options.parameterCount);
+            }
+            if (options.argumentCount !== undefined) {
+                assert.equal(help.argumentCount, options.argumentCount);
+            }
+            assert.equal(selectedItem.isVariadic, !!options.isVariadic);
+            var actualTags = selectedItem.tags;
+            assert.equal(actualTags.length, (options.tags || ts.emptyArray).length, this.assertionMessageAtLastKnownMarker("signature help tags"));
+            ts.zipWith((options.tags || ts.emptyArray), actualTags, function (expectedTag, actualTag) {
+                assert.equal(expectedTag.name, actualTag.name);
+                assert.equal(expectedTag.text, actualTag.text, _this.assertionMessageAtLastKnownMarker("signature help tag " + actualTag.name));
+            });
+            var allKeys = [
+                "marker",
+                "overloadsCount",
+                "docComment",
+                "text",
+                "parameterName",
+                "parameterSpan",
+                "parameterDocComment",
+                "parameterCount",
+                "isVariadic",
+                "tags",
+                "argumentCount",
+            ];
+            for (var key in options) {
+                ts.Debug.assert(ts.contains(allKeys, key));
+            }
+        };
+        TestState.prototype.validate = function (name, expected, actual) {
+            if (expected && expected !== actual) {
+                this.raiseError("Expected " + name + " '" + expected + "'.  Got '" + actual + "' instead.");
+            }
+        };
+        TestState.prototype.verifyRenameInfoSucceeded = function (displayName, fullDisplayName, kind, kindModifiers) {
+            var renameInfo = this.languageService.getRenameInfo(this.activeFile.fileName, this.currentCaretPosition);
+            if (!renameInfo.canRename) {
+                this.raiseError("Rename did not succeed");
+            }
+            this.validate("displayName", displayName, renameInfo.displayName);
+            this.validate("fullDisplayName", fullDisplayName, renameInfo.fullDisplayName);
+            this.validate("kind", kind, renameInfo.kind);
+            this.validate("kindModifiers", kindModifiers, renameInfo.kindModifiers);
+            if (this.getRanges().length !== 1) {
+                this.raiseError("Expected a single range to be selected in the test file.");
+            }
+            var expectedRange = this.getRanges()[0];
+            if (renameInfo.triggerSpan.start !== expectedRange.pos ||
+                ts.textSpanEnd(renameInfo.triggerSpan) !== expectedRange.end) {
+                this.raiseError("Expected triggerSpan [" + expectedRange.pos + "," + expectedRange.end + ").  Got [" +
+                    renameInfo.triggerSpan.start + "," + ts.textSpanEnd(renameInfo.triggerSpan) + ") instead.");
+            }
+        };
+        TestState.prototype.verifyRenameInfoFailed = function (message) {
+            var renameInfo = this.languageService.getRenameInfo(this.activeFile.fileName, this.currentCaretPosition);
+            if (renameInfo.canRename) {
+                this.raiseError("Rename was expected to fail");
+            }
+            this.validate("error", message, renameInfo.localizedErrorMessage);
+        };
+        TestState.prototype.spanInfoToString = function (spanInfo, prefixString) {
+            var resultString = "SpanInfo: " + JSON.stringify(spanInfo);
+            if (spanInfo) {
+                var spanString = this.activeFile.content.substr(spanInfo.start, spanInfo.length);
+                var spanLineMap = ts.computeLineStarts(spanString);
+                for (var i = 0; i < spanLineMap.length; i++) {
+                    if (!i) {
+                        resultString += "\n";
+                    }
+                    resultString += prefixString + spanString.substring(spanLineMap[i], spanLineMap[i + 1]);
+                }
+                resultString += "\n" + prefixString + ":=> (" + this.getLineColStringAtPosition(spanInfo.start) + ") to (" + this.getLineColStringAtPosition(ts.textSpanEnd(spanInfo)) + ")";
+            }
+            return resultString;
+        };
+        TestState.prototype.baselineCurrentFileLocations = function (getSpanAtPos) {
+            var _this = this;
+            var fileLineMap = ts.computeLineStarts(this.activeFile.content);
+            var nextLine = 0;
+            var resultString = "";
+            var currentLine;
+            var previousSpanInfo;
+            var startColumn;
+            var length;
+            var prefixString = "    >";
+            var pos = 0;
+            var addSpanInfoString = function () {
+                if (previousSpanInfo) {
+                    resultString += currentLine;
+                    var thisLineMarker = ts.repeatString(" ", startColumn) + ts.repeatString("~", length);
+                    thisLineMarker += ts.repeatString(" ", _this.alignmentForExtraInfo - thisLineMarker.length - prefixString.length + 1);
+                    resultString += thisLineMarker;
+                    resultString += "=> Pos: (" + (pos - length) + " to " + (pos - 1) + ") ";
+                    resultString += " " + previousSpanInfo;
+                    previousSpanInfo = undefined;
+                }
+            };
+            for (; pos < this.activeFile.content.length; pos++) {
+                if (pos === 0 || pos === fileLineMap[nextLine]) {
+                    nextLine++;
+                    addSpanInfoString();
+                    if (resultString.length) {
+                        resultString += "\n--------------------------------";
+                    }
+                    currentLine = "\n" + nextLine.toString() + ts.repeatString(" ", 3 - nextLine.toString().length) + ">" + this.activeFile.content.substring(pos, fileLineMap[nextLine]) + "\n    ";
+                    startColumn = 0;
+                    length = 0;
+                }
+                var spanInfo = this.spanInfoToString(getSpanAtPos(pos), prefixString);
+                if (previousSpanInfo && previousSpanInfo !== spanInfo) {
+                    addSpanInfoString();
+                    previousSpanInfo = spanInfo;
+                    startColumn = startColumn + length;
+                    length = 1;
+                }
+                else {
+                    previousSpanInfo = spanInfo;
+                    length++;
+                }
+            }
+            addSpanInfoString();
+            return resultString;
+        };
+        TestState.prototype.getBreakpointStatementLocation = function (pos) {
+            return this.languageService.getBreakpointStatementAtPosition(this.activeFile.fileName, pos);
+        };
+        TestState.prototype.baselineCurrentFileBreakpointLocations = function () {
+            var _this = this;
+            var baselineFile = this.testData.globalOptions["BaselineFile" /* baselineFile */];
+            if (!baselineFile) {
+                baselineFile = this.activeFile.fileName.replace(this.basePath + "/breakpointValidation", "bpSpan");
+                baselineFile = baselineFile.replace(".ts" /* Ts */, ".baseline");
+            }
+            Harness.Baseline.runBaseline(baselineFile, function () {
+                return _this.baselineCurrentFileLocations(function (pos) { return _this.getBreakpointStatementLocation(pos); });
+            });
+        };
+        TestState.prototype.baselineGetEmitOutput = function (insertResultsIntoVfs) {
+            var _this = this;
+            // Find file to be emitted
+            var emitFiles = []; // List of FourSlashFile that has emitThisFile flag on
+            var allFourSlashFiles = this.testData.files;
+            for (var _i = 0, allFourSlashFiles_1 = allFourSlashFiles; _i < allFourSlashFiles_1.length; _i++) {
+                var file = allFourSlashFiles_1[_i];
+                if (file.fileOptions["emitThisFile" /* emitThisFile */] === "true") {
+                    // Find a file with the flag emitThisFile turned on
+                    emitFiles.push(file);
+                }
+            }
+            // If there is not emiThisFile flag specified in the test file, throw an error
+            if (emitFiles.length === 0) {
+                this.raiseError("No emitThisFile is specified in the test file");
+            }
+            Harness.Baseline.runBaseline(this.testData.globalOptions["BaselineFile" /* baselineFile */], function () {
+                var resultString = "";
+                // Loop through all the emittedFiles and emit them one by one
+                emitFiles.forEach(function (emitFile) {
+                    var emitOutput = _this.languageService.getEmitOutput(emitFile.fileName);
+                    // Print emitOutputStatus in readable format
+                    resultString += "EmitSkipped: " + emitOutput.emitSkipped + Harness.IO.newLine();
+                    if (emitOutput.emitSkipped) {
+                        resultString += "Diagnostics:" + Harness.IO.newLine();
+                        var diagnostics = ts.getPreEmitDiagnostics(_this.languageService.getProgram()); // TODO: GH#18217
+                        for (var _i = 0, diagnostics_1 = diagnostics; _i < diagnostics_1.length; _i++) {
+                            var diagnostic = diagnostics_1[_i];
+                            if (!ts.isString(diagnostic.messageText)) {
+                                var chainedMessage = diagnostic.messageText;
+                                var indentation = " ";
+                                while (chainedMessage) {
+                                    resultString += indentation + chainedMessage.messageText + Harness.IO.newLine();
+                                    chainedMessage = chainedMessage.next;
+                                    indentation = indentation + " ";
+                                }
+                            }
+                            else {
+                                resultString += "  " + diagnostic.messageText + Harness.IO.newLine();
+                            }
+                        }
+                    }
+                    for (var _a = 0, _b = emitOutput.outputFiles; _a < _b.length; _a++) {
+                        var outputFile = _b[_a];
+                        var fileName = "FileName : " + outputFile.name + Harness.IO.newLine();
+                        resultString = resultString + fileName + outputFile.text;
+                        if (insertResultsIntoVfs) {
+                            _this.languageServiceAdapterHost.addScript(ts.getNormalizedAbsolutePath(outputFile.name, "/"), outputFile.text, /*isRootFile*/ true);
+                        }
+                    }
+                    resultString += Harness.IO.newLine();
+                });
+                return resultString;
+            });
+        };
+        TestState.prototype.baselineQuickInfo = function () {
+            var _this = this;
+            var baselineFile = this.testData.globalOptions["BaselineFile" /* baselineFile */];
+            if (!baselineFile) {
+                baselineFile = ts.getBaseFileName(this.activeFile.fileName).replace(".ts" /* Ts */, ".baseline");
+            }
+            Harness.Baseline.runBaseline(baselineFile, function () { return stringify(_this.testData.markers.map(function (marker) { return ({
+                marker: marker,
+                quickInfo: _this.languageService.getQuickInfoAtPosition(marker.fileName, marker.position)
+            }); })); });
+        };
+        TestState.prototype.printBreakpointLocation = function (pos) {
+            Harness.IO.log("\n**Pos: " + pos + " " + this.spanInfoToString(this.getBreakpointStatementLocation(pos), "  "));
+        };
+        TestState.prototype.printBreakpointAtCurrentLocation = function () {
+            this.printBreakpointLocation(this.currentCaretPosition);
+        };
+        TestState.prototype.printCurrentParameterHelp = function () {
+            var help = this.languageService.getSignatureHelpItems(this.activeFile.fileName, this.currentCaretPosition);
+            Harness.IO.log(stringify(help));
+        };
+        TestState.prototype.printCurrentQuickInfo = function () {
+            var quickInfo = this.languageService.getQuickInfoAtPosition(this.activeFile.fileName, this.currentCaretPosition);
+            Harness.IO.log("Quick Info: " + quickInfo.displayParts.map(function (part) { return part.text; }).join(""));
+        };
+        TestState.prototype.printErrorList = function () {
+            var syntacticErrors = this.languageService.getSyntacticDiagnostics(this.activeFile.fileName);
+            var semanticErrors = this.languageService.getSemanticDiagnostics(this.activeFile.fileName);
+            var errorList = ts.concatenate(syntacticErrors, semanticErrors);
+            Harness.IO.log("Error list (" + errorList.length + " errors)");
+            if (errorList.length) {
+                errorList.forEach(function (err) {
+                    Harness.IO.log("start: " + err.start +
+                        ", length: " + err.length +
+                        ", message: " + ts.flattenDiagnosticMessageText(err.messageText, Harness.IO.newLine()));
+                });
+            }
+        };
+        TestState.prototype.printCurrentFileState = function (showWhitespace, makeCaretVisible) {
+            for (var _i = 0, _a = this.testData.files; _i < _a.length; _i++) {
+                var file = _a[_i];
+                var active = (this.activeFile === file);
+                Harness.IO.log("=== Script (" + file.fileName + ") " + (active ? "(active, cursor at |)" : "") + " ===");
+                var content = this.getFileContent(file.fileName);
+                if (active) {
+                    content = content.substr(0, this.currentCaretPosition) + (makeCaretVisible ? "|" : "") + content.substr(this.currentCaretPosition);
+                }
+                if (showWhitespace) {
+                    content = makeWhitespaceVisible(content);
+                }
+                Harness.IO.log(content);
+            }
+        };
+        TestState.prototype.printCurrentSignatureHelp = function () {
+            var help = this.getSignatureHelp();
+            Harness.IO.log(stringify(help.items[help.selectedItemIndex]));
+        };
+        TestState.prototype.getSignatureHelp = function () {
+            return this.languageService.getSignatureHelpItems(this.activeFile.fileName, this.currentCaretPosition);
+        };
+        TestState.prototype.printCompletionListMembers = function (preferences) {
+            var completions = this.getCompletionListAtCaret(preferences);
+            this.printMembersOrCompletions(completions);
+        };
+        TestState.prototype.printMembersOrCompletions = function (info) {
+            if (info === undefined) {
+                return "No completion info.";
+            }
+            var entries = info.entries;
+            function pad(s, length) {
+                return s + new Array(length - s.length + 1).join(" ");
+            }
+            function max(arr, selector) {
+                return arr.reduce(function (prev, x) { return Math.max(prev, selector(x)); }, 0);
+            }
+            var longestNameLength = max(entries, function (m) { return m.name.length; });
+            var longestKindLength = max(entries, function (m) { return m.kind.length; });
+            entries.sort(function (m, n) { return m.sortText > n.sortText ? 1 : m.sortText < n.sortText ? -1 : m.name > n.name ? 1 : m.name < n.name ? -1 : 0; });
+            var membersString = entries.map(function (m) { return pad(m.name, longestNameLength) + " " + pad(m.kind, longestKindLength) + " " + m.kindModifiers + " " + (m.isRecommended ? "recommended " : "") + (m.source === undefined ? "" : m.source); }).join("\n");
+            Harness.IO.log(membersString);
+        };
+        TestState.prototype.printContext = function () {
+            ts.forEach(this.languageServiceAdapterHost.getFilenames(), Harness.IO.log);
+        };
+        TestState.prototype.deleteChar = function (count) {
+            if (count === void 0) { count = 1; }
+            var offset = this.currentCaretPosition;
+            var ch = "";
+            var checkCadence = (count >> 2) + 1;
+            for (var i = 0; i < count; i++) {
+                this.editScriptAndUpdateMarkers(this.activeFile.fileName, offset, offset + 1, ch);
+                if (i % checkCadence === 0) {
+                    this.checkPostEditInvariants();
+                }
+                // Handle post-keystroke formatting
+                if (this.enableFormatting) {
+                    var edits = this.languageService.getFormattingEditsAfterKeystroke(this.activeFile.fileName, offset, ch, this.formatCodeSettings);
+                    if (edits.length) {
+                        offset += this.applyEdits(this.activeFile.fileName, edits, /*isFormattingEdit*/ true);
+                    }
+                }
+            }
+            this.checkPostEditInvariants();
+        };
+        TestState.prototype.replace = function (start, length, text) {
+            this.editScriptAndUpdateMarkers(this.activeFile.fileName, start, start + length, text);
+            this.checkPostEditInvariants();
+        };
+        TestState.prototype.deleteCharBehindMarker = function (count) {
+            if (count === void 0) { count = 1; }
+            var offset = this.currentCaretPosition;
+            var ch = "";
+            var checkCadence = (count >> 2) + 1;
+            for (var i = 0; i < count; i++) {
+                this.currentCaretPosition--;
+                offset--;
+                this.editScriptAndUpdateMarkers(this.activeFile.fileName, offset, offset + 1, ch);
+                if (i % checkCadence === 0) {
+                    this.checkPostEditInvariants();
+                }
+                // Don't need to examine formatting because there are no formatting changes on backspace.
+            }
+            this.checkPostEditInvariants();
+        };
+        // Enters lines of text at the current caret position
+        TestState.prototype.type = function (text, highFidelity) {
+            if (highFidelity === void 0) { highFidelity = false; }
+            var offset = this.currentCaretPosition;
+            var prevChar = " ";
+            var checkCadence = (text.length >> 2) + 1;
+            for (var i = 0; i < text.length; i++) {
+                var ch = text.charAt(i);
+                this.editScriptAndUpdateMarkers(this.activeFile.fileName, offset, offset, ch);
+                if (highFidelity) {
+                    this.languageService.getBraceMatchingAtPosition(this.activeFile.fileName, offset);
+                }
+                this.currentCaretPosition++;
+                offset++;
+                if (highFidelity) {
+                    if (ch === "(" || ch === ",") {
+                        /* Signature help*/
+                        this.languageService.getSignatureHelpItems(this.activeFile.fileName, offset);
+                    }
+                    else if (prevChar === " " && /A-Za-z_/.test(ch)) {
+                        /* Completions */
+                        this.languageService.getCompletionsAtPosition(this.activeFile.fileName, offset, ts.defaultPreferences);
+                    }
+                    if (i % checkCadence === 0) {
+                        this.checkPostEditInvariants();
+                    }
+                }
+                // Handle post-keystroke formatting
+                if (this.enableFormatting) {
+                    var edits = this.languageService.getFormattingEditsAfterKeystroke(this.activeFile.fileName, offset, ch, this.formatCodeSettings);
+                    if (edits.length) {
+                        offset += this.applyEdits(this.activeFile.fileName, edits, /*isFormattingEdit*/ true);
+                    }
+                }
+            }
+            this.checkPostEditInvariants();
+        };
+        // Enters text as if the user had pasted it
+        TestState.prototype.paste = function (text) {
+            var start = this.currentCaretPosition;
+            this.editScriptAndUpdateMarkers(this.activeFile.fileName, this.currentCaretPosition, this.currentCaretPosition, text);
+            this.checkPostEditInvariants();
+            var offset = this.currentCaretPosition += text.length;
+            // Handle formatting
+            if (this.enableFormatting) {
+                var edits = this.languageService.getFormattingEditsForRange(this.activeFile.fileName, start, offset, this.formatCodeSettings);
+                if (edits.length) {
+                    this.applyEdits(this.activeFile.fileName, edits, /*isFormattingEdit*/ true);
+                }
+            }
+            this.checkPostEditInvariants();
+        };
+        TestState.prototype.checkPostEditInvariants = function () {
+            if (this.testType !== 0 /* Native */) {
+                // getSourcefile() results can not be serialized. Only perform these verifications
+                // if running against a native LS object.
+                return;
+            }
+            var incrementalSourceFile = this.languageService.getNonBoundSourceFile(this.activeFile.fileName);
+            Utils.assertInvariants(incrementalSourceFile, /*parent:*/ undefined);
+            var incrementalSyntaxDiagnostics = incrementalSourceFile.parseDiagnostics;
+            // Check syntactic structure
+            var content = this.getFileContent(this.activeFile.fileName);
+            var referenceSourceFile = ts.createLanguageServiceSourceFile(this.activeFile.fileName, createScriptSnapShot(content), 6 /* Latest */, /*version:*/ "0", /*setNodeParents:*/ false);
+            var referenceSyntaxDiagnostics = referenceSourceFile.parseDiagnostics;
+            Utils.assertDiagnosticsEquals(incrementalSyntaxDiagnostics, referenceSyntaxDiagnostics);
+            Utils.assertStructuralEquals(incrementalSourceFile, referenceSourceFile);
+        };
+        /**
+         * @returns The number of characters added to the file as a result of the edits.
+         * May be negative.
+         */
+        TestState.prototype.applyEdits = function (fileName, edits, isFormattingEdit) {
+            // We get back a set of edits, but langSvc.editScript only accepts one at a time. Use this to keep track
+            // of the incremental offset from each edit to the next. We assume these edit ranges don't overlap
+            // Copy this so we don't ruin someone else's copy
+            edits = JSON.parse(JSON.stringify(edits));
+            // Get a snapshot of the content of the file so we can make sure any formatting edits didn't destroy non-whitespace characters
+            var oldContent = this.getFileContent(fileName);
+            var runningOffset = 0;
+            for (var i = 0; i < edits.length; i++) {
+                var edit = edits[i];
+                var offsetStart = edit.span.start;
+                var offsetEnd = offsetStart + edit.span.length;
+                this.editScriptAndUpdateMarkers(fileName, offsetStart, offsetEnd, edit.newText);
+                var editDelta = edit.newText.length - edit.span.length;
+                if (offsetStart <= this.currentCaretPosition) {
+                    if (offsetEnd <= this.currentCaretPosition) {
+                        // The entirety of the edit span falls before the caret position, shift the caret accordingly
+                        this.currentCaretPosition += editDelta;
+                    }
+                    else {
+                        // The span being replaced includes the caret position, place the caret at the beginning of the span
+                        this.currentCaretPosition = offsetStart;
+                    }
+                }
+                runningOffset += editDelta;
+                // Update positions of any future edits affected by this change
+                for (var j = i + 1; j < edits.length; j++) {
+                    if (edits[j].span.start >= edits[i].span.start) {
+                        edits[j].span.start += editDelta;
+                    }
+                }
+            }
+            if (isFormattingEdit) {
+                var newContent = this.getFileContent(fileName);
+                if (this.removeWhitespace(newContent) !== this.removeWhitespace(oldContent)) {
+                    this.raiseError("Formatting operation destroyed non-whitespace content");
+                }
+            }
+            return runningOffset;
+        };
+        TestState.prototype.copyFormatOptions = function () {
+            return ts.clone(this.formatCodeSettings);
+        };
+        TestState.prototype.setFormatOptions = function (formatCodeOptions) {
+            var oldFormatCodeOptions = this.formatCodeSettings;
+            this.formatCodeSettings = ts.toEditorSettings(formatCodeOptions);
+            return oldFormatCodeOptions;
+        };
+        TestState.prototype.formatDocument = function () {
+            var edits = this.languageService.getFormattingEditsForDocument(this.activeFile.fileName, this.formatCodeSettings);
+            this.applyEdits(this.activeFile.fileName, edits, /*isFormattingEdit*/ true);
+        };
+        TestState.prototype.formatSelection = function (start, end) {
+            var edits = this.languageService.getFormattingEditsForRange(this.activeFile.fileName, start, end, this.formatCodeSettings);
+            this.applyEdits(this.activeFile.fileName, edits, /*isFormattingEdit*/ true);
+        };
+        TestState.prototype.formatOnType = function (pos, key) {
+            var edits = this.languageService.getFormattingEditsAfterKeystroke(this.activeFile.fileName, pos, key, this.formatCodeSettings);
+            this.applyEdits(this.activeFile.fileName, edits, /*isFormattingEdit*/ true);
+        };
+        TestState.prototype.editScriptAndUpdateMarkers = function (fileName, editStart, editEnd, newText) {
+            this.languageServiceAdapterHost.editScript(fileName, editStart, editEnd, newText);
+            for (var _i = 0, _a = this.testData.markers; _i < _a.length; _i++) {
+                var marker = _a[_i];
+                if (marker.fileName === fileName) {
+                    marker.position = updatePosition(marker.position);
+                }
+            }
+            for (var _b = 0, _c = this.testData.ranges; _b < _c.length; _b++) {
+                var range = _c[_b];
+                if (range.fileName === fileName) {
+                    range.pos = updatePosition(range.pos);
+                    range.end = updatePosition(range.end);
+                }
+            }
+            function updatePosition(position) {
+                if (position > editStart) {
+                    if (position < editEnd) {
+                        // Inside the edit - mark it as invalidated (?)
+                        return -1;
+                    }
+                    else {
+                        // Move marker back/forward by the appropriate amount
+                        return position + (editStart - editEnd) + newText.length;
+                    }
+                }
+                else {
+                    return position;
+                }
+            }
+        };
+        TestState.prototype.removeWhitespace = function (text) {
+            return text.replace(/\s/g, "");
+        };
+        TestState.prototype.goToBOF = function () {
+            this.goToPosition(0);
+        };
+        TestState.prototype.goToEOF = function () {
+            var len = this.getFileContent(this.activeFile.fileName).length;
+            this.goToPosition(len);
+        };
+        TestState.prototype.goToRangeStart = function (_a) {
+            var fileName = _a.fileName, pos = _a.pos;
+            this.openFile(fileName);
+            this.goToPosition(pos);
+        };
+        TestState.prototype.goToTypeDefinition = function (definitionIndex) {
+            var definitions = this.languageService.getTypeDefinitionAtPosition(this.activeFile.fileName, this.currentCaretPosition);
+            if (!definitions || !definitions.length) {
+                this.raiseError("goToTypeDefinition failed - expected to find at least one definition location but got 0");
+            }
+            if (definitionIndex >= definitions.length) {
+                this.raiseError("goToTypeDefinition failed - definitionIndex value (" + definitionIndex + ") exceeds definition list size (" + definitions.length + ")");
+            }
+            var definition = definitions[definitionIndex];
+            this.openFile(definition.fileName);
+            this.currentCaretPosition = definition.textSpan.start;
+        };
+        TestState.prototype.verifyTypeDefinitionsCount = function (negative, expectedCount) {
+            var assertFn = negative ? assert.notEqual : assert.equal;
+            var definitions = this.languageService.getTypeDefinitionAtPosition(this.activeFile.fileName, this.currentCaretPosition);
+            var actualCount = definitions && definitions.length || 0;
+            assertFn(actualCount, expectedCount, this.messageAtLastKnownMarker("Type definitions Count"));
+        };
+        TestState.prototype.verifyImplementationListIsEmpty = function (negative) {
+            var implementations = this.languageService.getImplementationAtPosition(this.activeFile.fileName, this.currentCaretPosition);
+            if (negative) {
+                assert.isTrue(implementations && implementations.length > 0, "Expected at least one implementation but got 0");
+            }
+            else {
+                assert.isUndefined(implementations, "Expected implementation list to be empty but implementations returned");
+            }
+        };
+        TestState.prototype.verifyGoToDefinitionName = function (expectedName, expectedContainerName) {
+            var definitions = this.languageService.getDefinitionAtPosition(this.activeFile.fileName, this.currentCaretPosition);
+            var actualDefinitionName = definitions && definitions.length ? definitions[0].name : "";
+            var actualDefinitionContainerName = definitions && definitions.length ? definitions[0].containerName : "";
+            assert.equal(actualDefinitionName, expectedName, this.messageAtLastKnownMarker("Definition Info Name"));
+            assert.equal(actualDefinitionContainerName, expectedContainerName, this.messageAtLastKnownMarker("Definition Info Container Name"));
+        };
+        TestState.prototype.goToImplementation = function () {
+            var implementations = this.languageService.getImplementationAtPosition(this.activeFile.fileName, this.currentCaretPosition);
+            if (!implementations || !implementations.length) {
+                this.raiseError("goToImplementation failed - expected to find at least one implementation location but got 0");
+            }
+            if (implementations.length > 1) {
+                this.raiseError("goToImplementation failed - more than 1 implementation returned (" + implementations.length + ")");
+            }
+            var implementation = implementations[0];
+            this.openFile(implementation.fileName);
+            this.currentCaretPosition = implementation.textSpan.start;
+        };
+        TestState.prototype.verifyRangesInImplementationList = function (markerName) {
+            this.goToMarker(markerName);
+            var implementations = this.languageService.getImplementationAtPosition(this.activeFile.fileName, this.currentCaretPosition);
+            if (!implementations || !implementations.length) {
+                this.raiseError("verifyRangesInImplementationList failed - expected to find at least one implementation location but got 0");
+            }
+            var duplicate = findDuplicatedElement(implementations, implementationsAreEqual);
+            if (duplicate) {
+                var textSpan = duplicate.textSpan, fileName = duplicate.fileName;
+                var end = textSpan.start + textSpan.length;
+                this.raiseError("Duplicate implementations returned for range (" + textSpan.start + ", " + end + ") in " + fileName);
+            }
+            var ranges = this.getRanges();
+            if (!ranges || !ranges.length) {
+                this.raiseError("verifyRangesInImplementationList failed - expected to find at least one range in test source");
+            }
+            var unsatisfiedRanges = [];
+            var delayedErrors = [];
+            var _loop_8 = function (range) {
+                var length = range.end - range.pos;
+                var matchingImpl = ts.find(implementations, function (impl) {
+                    return range.fileName === impl.fileName && range.pos === impl.textSpan.start && length === impl.textSpan.length;
+                });
+                if (matchingImpl) {
+                    if (range.marker && range.marker.data) {
+                        var expected = range.marker.data;
+                        if (expected.displayParts) {
+                            if (!ts.arrayIsEqualTo(expected.displayParts, matchingImpl.displayParts, displayPartIsEqualTo)) {
+                                delayedErrors.push("Mismatched display parts: expected " + JSON.stringify(expected.displayParts) + ", actual " + JSON.stringify(matchingImpl.displayParts));
+                            }
+                        }
+                        else if (expected.parts) {
+                            var actualParts = matchingImpl.displayParts.map(function (p) { return p.text; });
+                            if (!ts.arrayIsEqualTo(expected.parts, actualParts)) {
+                                delayedErrors.push("Mismatched non-tagged display parts: expected " + JSON.stringify(expected.parts) + ", actual " + JSON.stringify(actualParts));
+                            }
+                        }
+                        if (expected.kind !== undefined) {
+                            if (expected.kind !== matchingImpl.kind) {
+                                delayedErrors.push("Mismatched kind: expected " + JSON.stringify(expected.kind) + ", actual " + JSON.stringify(matchingImpl.kind));
+                            }
+                        }
+                    }
+                    matchingImpl.matched = true;
+                }
+                else {
+                    unsatisfiedRanges.push(range);
+                }
+            };
+            for (var _i = 0, ranges_2 = ranges; _i < ranges_2.length; _i++) {
+                var range = ranges_2[_i];
+                _loop_8(range);
+            }
+            if (delayedErrors.length) {
+                this.raiseError(delayedErrors.join("\n"));
+            }
+            var unmatchedImplementations = implementations.filter(function (impl) { return !impl.matched; });
+            if (unmatchedImplementations.length || unsatisfiedRanges.length) {
+                var error = "Not all ranges or implementations are satisfied";
+                if (unsatisfiedRanges.length) {
+                    error += "\nUnsatisfied ranges:";
+                    for (var _a = 0, unsatisfiedRanges_1 = unsatisfiedRanges; _a < unsatisfiedRanges_1.length; _a++) {
+                        var range = unsatisfiedRanges_1[_a];
+                        error += "\n    (" + range.pos + ", " + range.end + ") in " + range.fileName + ": " + this.rangeText(range);
+                    }
+                }
+                if (unmatchedImplementations.length) {
+                    error += "\nUnmatched implementations:";
+                    for (var _b = 0, unmatchedImplementations_1 = unmatchedImplementations; _b < unmatchedImplementations_1.length; _b++) {
+                        var impl = unmatchedImplementations_1[_b];
+                        var end = impl.textSpan.start + impl.textSpan.length;
+                        error += "\n    (" + impl.textSpan.start + ", " + end + ") in " + impl.fileName + ": " + this.getFileContent(impl.fileName).slice(impl.textSpan.start, end);
+                    }
+                }
+                this.raiseError(error);
+            }
+            function implementationsAreEqual(a, b) {
+                return a.fileName === b.fileName && TestState.textSpansEqual(a.textSpan, b.textSpan);
+            }
+            function displayPartIsEqualTo(a, b) {
+                return a.kind === b.kind && a.text === b.text;
+            }
+        };
+        TestState.prototype.getMarkers = function () {
+            //  Return a copy of the list
+            return this.testData.markers.slice(0);
+        };
+        TestState.prototype.getMarkerNames = function () {
+            return ts.arrayFrom(this.testData.markerPositions.keys());
+        };
+        TestState.prototype.getRanges = function () {
+            return this.testData.ranges;
+        };
+        TestState.prototype.rangesByText = function () {
+            var result = ts.createMultiMap();
+            for (var _i = 0, _a = this.getRanges(); _i < _a.length; _i++) {
+                var range = _a[_i];
+                var text = this.rangeText(range);
+                result.add(text, range);
+            }
+            return result;
+        };
+        TestState.prototype.rangeText = function (_a) {
+            var fileName = _a.fileName, pos = _a.pos, end = _a.end;
+            return this.getFileContent(fileName).slice(pos, end);
+        };
+        TestState.prototype.verifyCaretAtMarker = function (markerName) {
+            if (markerName === void 0) { markerName = ""; }
+            var pos = this.getMarkerByName(markerName);
+            if (pos.fileName !== this.activeFile.fileName) {
+                throw new Error("verifyCaretAtMarker failed - expected to be in file \"" + pos.fileName + "\", but was in file \"" + this.activeFile.fileName + "\"");
+            }
+            if (pos.position !== this.currentCaretPosition) {
+                throw new Error("verifyCaretAtMarker failed - expected to be at marker \"/*" + markerName + "*/, but was at position " + this.currentCaretPosition + "(" + this.getLineColStringAtPosition(this.currentCaretPosition) + ")");
+            }
+        };
+        TestState.prototype.getIndentation = function (fileName, position, indentStyle, baseIndentSize) {
+            var formatOptions = ts.clone(this.formatCodeSettings);
+            formatOptions.indentStyle = indentStyle;
+            formatOptions.baseIndentSize = baseIndentSize;
+            return this.languageService.getIndentationAtPosition(fileName, position, formatOptions);
+        };
+        TestState.prototype.verifyIndentationAtCurrentPosition = function (numberOfSpaces, indentStyle, baseIndentSize) {
+            if (indentStyle === void 0) { indentStyle = ts.IndentStyle.Smart; }
+            if (baseIndentSize === void 0) { baseIndentSize = 0; }
+            var actual = this.getIndentation(this.activeFile.fileName, this.currentCaretPosition, indentStyle, baseIndentSize);
+            var lineCol = this.getLineColStringAtPosition(this.currentCaretPosition);
+            if (actual !== numberOfSpaces) {
+                this.raiseError("verifyIndentationAtCurrentPosition failed at " + lineCol + " - expected: " + numberOfSpaces + ", actual: " + actual);
+            }
+        };
+        TestState.prototype.verifyIndentationAtPosition = function (fileName, position, numberOfSpaces, indentStyle, baseIndentSize) {
+            if (indentStyle === void 0) { indentStyle = ts.IndentStyle.Smart; }
+            if (baseIndentSize === void 0) { baseIndentSize = 0; }
+            var actual = this.getIndentation(fileName, position, indentStyle, baseIndentSize);
+            var lineCol = this.getLineColStringAtPosition(position);
+            if (actual !== numberOfSpaces) {
+                this.raiseError("verifyIndentationAtPosition failed at " + lineCol + " - expected: " + numberOfSpaces + ", actual: " + actual);
+            }
+        };
+        TestState.prototype.verifyCurrentLineContent = function (text) {
+            var actual = this.getCurrentLineContent();
+            if (actual !== text) {
+                throw new Error("verifyCurrentLineContent\n" +
+                    "\tExpected: \"" + text + "\"\n" +
+                    "\t  Actual: \"" + actual + "\"");
+            }
+        };
+        TestState.prototype.verifyCurrentFileContent = function (text) {
+            this.verifyFileContent(this.activeFile.fileName, text);
+        };
+        TestState.prototype.verifyFileContent = function (fileName, text) {
+            var actual = this.getFileContent(fileName);
+            if (actual !== text) {
+                throw new Error("verifyFileContent failed:\n" + showTextDiff(text, actual));
+            }
+        };
+        TestState.prototype.verifyTextAtCaretIs = function (text) {
+            var actual = this.getFileContent(this.activeFile.fileName).substring(this.currentCaretPosition, this.currentCaretPosition + text.length);
+            if (actual !== text) {
+                throw new Error("verifyTextAtCaretIs\n" +
+                    "\tExpected: \"" + text + "\"\n" +
+                    "\t  Actual: \"" + actual + "\"");
+            }
+        };
+        TestState.prototype.verifyCurrentNameOrDottedNameSpanText = function (text) {
+            var span = this.languageService.getNameOrDottedNameSpan(this.activeFile.fileName, this.currentCaretPosition, this.currentCaretPosition);
+            if (!span) {
+                return this.raiseError("verifyCurrentNameOrDottedNameSpanText\n" +
+                    "\tExpected: \"" + text + "\"\n" +
+                    "\t  Actual: undefined");
+            }
+            var actual = this.getFileContent(this.activeFile.fileName).substring(span.start, ts.textSpanEnd(span));
+            if (actual !== text) {
+                this.raiseError("verifyCurrentNameOrDottedNameSpanText\n" +
+                    "\tExpected: \"" + text + "\"\n" +
+                    "\t  Actual: \"" + actual + "\"");
+            }
+        };
+        TestState.prototype.getNameOrDottedNameSpan = function (pos) {
+            return this.languageService.getNameOrDottedNameSpan(this.activeFile.fileName, pos, pos);
+        };
+        TestState.prototype.baselineCurrentFileNameOrDottedNameSpans = function () {
+            var _this = this;
+            Harness.Baseline.runBaseline(this.testData.globalOptions["BaselineFile" /* baselineFile */], function () {
+                return _this.baselineCurrentFileLocations(function (pos) {
+                    return _this.getNameOrDottedNameSpan(pos);
+                });
+            });
+        };
+        TestState.prototype.printNameOrDottedNameSpans = function (pos) {
+            Harness.IO.log(this.spanInfoToString(this.getNameOrDottedNameSpan(pos), "**"));
+        };
+        TestState.prototype.verifyClassifications = function (expected, actual, sourceFileText) {
+            var _this = this;
+            if (actual.length !== expected.length) {
+                this.raiseError("verifyClassifications failed - expected total classifications to be " + expected.length +
+                    ", but was " + actual.length +
+                    jsonMismatchString());
+            }
+            ts.zipWith(expected, actual, function (expectedClassification, actualClassification) {
+                var expectedType = expectedClassification.classificationType;
+                if (expectedType !== actualClassification.classificationType) {
+                    _this.raiseError("verifyClassifications failed - expected classifications type to be " +
+                        expectedType + ", but was " +
+                        actualClassification.classificationType +
+                        jsonMismatchString());
+                }
+                var expectedSpan = expectedClassification.textSpan;
+                var actualSpan = actualClassification.textSpan;
+                if (expectedSpan) {
+                    var expectedLength = expectedSpan.end - expectedSpan.start;
+                    if (expectedSpan.start !== actualSpan.start || expectedLength !== actualSpan.length) {
+                        _this.raiseError("verifyClassifications failed - expected span of text to be " +
+                            "{start=" + expectedSpan.start + ", length=" + expectedLength + "}, but was " +
+                            "{start=" + actualSpan.start + ", length=" + actualSpan.length + "}" +
+                            jsonMismatchString());
+                    }
+                }
+                var actualText = _this.activeFile.content.substr(actualSpan.start, actualSpan.length);
+                if (expectedClassification.text !== actualText) {
+                    _this.raiseError("verifyClassifications failed - expected classified text to be " +
+                        expectedClassification.text + ", but was " +
+                        actualText +
+                        jsonMismatchString());
+                }
+            });
+            function jsonMismatchString() {
+                var showActual = actual.map(function (_a) {
+                    var classificationType = _a.classificationType, textSpan = _a.textSpan;
+                    return ({ classificationType: classificationType, text: sourceFileText.slice(textSpan.start, textSpan.start + textSpan.length) });
+                });
+                return Harness.IO.newLine() +
+                    "expected: '" + Harness.IO.newLine() + stringify(expected) + "'" + Harness.IO.newLine() +
+                    "actual:   '" + Harness.IO.newLine() + stringify(showActual) + "'";
+            }
+        };
+        TestState.prototype.verifyProjectInfo = function (expected) {
+            var _this = this;
+            if (this.testType === 3 /* Server */) {
+                var actual = this.languageService.getProjectInfo(this.activeFile.fileName, 
+                /* needFileNameList */ true);
+                assert.equal(expected.join(","), actual.fileNames.map(function (file) {
+                    return file.replace(_this.basePath + "/", "");
+                }).join(","));
+            }
+        };
+        TestState.prototype.verifySemanticClassifications = function (expected) {
+            var actual = this.languageService.getSemanticClassifications(this.activeFile.fileName, ts.createTextSpan(0, this.activeFile.content.length));
+            this.verifyClassifications(expected, actual, this.activeFile.content);
+        };
+        TestState.prototype.verifySyntacticClassifications = function (expected) {
+            var actual = this.languageService.getSyntacticClassifications(this.activeFile.fileName, ts.createTextSpan(0, this.activeFile.content.length));
+            this.verifyClassifications(expected, actual, this.activeFile.content);
+        };
+        TestState.prototype.printOutliningSpans = function () {
+            var spans = this.languageService.getOutliningSpans(this.activeFile.fileName);
+            Harness.IO.log("Outlining spans (" + spans.length + " items)");
+            Harness.IO.log(stringify(spans));
+        };
+        TestState.prototype.verifyOutliningSpans = function (spans, kind) {
+            var _this = this;
+            var actual = this.languageService.getOutliningSpans(this.activeFile.fileName);
+            if (actual.length !== spans.length) {
+                this.raiseError("verifyOutliningSpans failed - expected total spans to be " + spans.length + ", but was " + actual.length);
+            }
+            ts.zipWith(spans, actual, function (expectedSpan, actualSpan, i) {
+                if (expectedSpan.pos !== actualSpan.textSpan.start || expectedSpan.end !== ts.textSpanEnd(actualSpan.textSpan)) {
+                    return _this.raiseError("verifyOutliningSpans failed - span " + (i + 1) + " expected: (" + expectedSpan.pos + "," + expectedSpan.end + "),  actual: (" + actualSpan.textSpan.start + "," + ts.textSpanEnd(actualSpan.textSpan) + ")");
+                }
+                if (kind !== undefined && actualSpan.kind !== kind) {
+                    return _this.raiseError("verifyOutliningSpans failed - span " + (i + 1) + " expected kind: ('" + kind + "'),  actual: ('" + actualSpan.kind + "')");
+                }
+            });
+        };
+        TestState.prototype.verifyTodoComments = function (descriptors, spans) {
+            var _this = this;
+            var actual = this.languageService.getTodoComments(this.activeFile.fileName, descriptors.map(function (d) { return { text: d, priority: 0 }; }));
+            if (actual.length !== spans.length) {
+                this.raiseError("verifyTodoComments failed - expected total spans to be " + spans.length + ", but was " + actual.length);
+            }
+            ts.zipWith(spans, actual, function (expectedSpan, actualComment, i) {
+                var actualCommentSpan = ts.createTextSpan(actualComment.position, actualComment.message.length);
+                if (expectedSpan.pos !== actualCommentSpan.start || expectedSpan.end !== ts.textSpanEnd(actualCommentSpan)) {
+                    _this.raiseError("verifyOutliningSpans failed - span " + (i + 1) + " expected: (" + expectedSpan.pos + "," + expectedSpan.end + "),  actual: (" + actualCommentSpan.start + "," + ts.textSpanEnd(actualCommentSpan) + ")");
+                }
+            });
+        };
+        /**
+         * Finds and applies a code action corresponding to the supplied parameters.
+         * If index is undefined, applies the unique code action available.
+         * @param errorCode The error code that generated the code action.
+         * @param index The nth (0-index-based) codeaction available generated by errorCode.
+         */
+        TestState.prototype.getAndApplyCodeActions = function (errorCode, index) {
+            var fileName = this.activeFile.fileName;
+            this.applyCodeActions(this.getCodeFixes(fileName, errorCode), index);
+        };
+        TestState.prototype.applyCodeActionFromCompletion = function (markerName, options) {
+            this.goToMarker(markerName);
+            var details = this.getCompletionEntryDetails(options.name, options.source, options.preferences);
+            var codeActions = details.codeActions;
+            if (codeActions.length !== 1) {
+                this.raiseError("Expected one code action, got " + codeActions.length);
+            }
+            if (codeActions[0].description !== options.description) {
+                this.raiseError("Expected description to be:\n" + options.description + "\ngot:\n" + codeActions[0].description);
+            }
+            this.applyCodeActions(codeActions);
+            this.verifyNewContent(options, ts.flatMap(codeActions, function (a) { return a.changes.map(function (c) { return c.fileName; }); }));
+        };
+        TestState.prototype.verifyRangeIs = function (expectedText, includeWhiteSpace) {
+            var ranges = this.getRanges();
+            if (ranges.length !== 1) {
+                this.raiseError("Exactly one range should be specified in the testfile.");
+            }
+            var actualText = this.rangeText(ranges[0]);
+            var result = includeWhiteSpace
+                ? actualText === expectedText
+                : this.removeWhitespace(actualText) === this.removeWhitespace(expectedText);
+            if (!result) {
+                this.raiseError("Actual range text doesn't match expected text.\n" + showTextDiff(expectedText, actualText));
+            }
+        };
+        /**
+         * Compares expected text to the text that would be in the sole range
+         * (ie: [|...|]) in the file after applying the codefix sole codefix
+         * in the source file.
+         */
+        TestState.prototype.verifyRangeAfterCodeFix = function (expectedText, includeWhiteSpace, errorCode, index) {
+            this.getAndApplyCodeActions(errorCode, index);
+            this.verifyRangeIs(expectedText, includeWhiteSpace);
+        };
+        TestState.prototype.verifyCodeFixAll = function (_a) {
+            var _this = this;
+            var fixId = _a.fixId, fixAllDescription = _a.fixAllDescription, newFileContent = _a.newFileContent, expectedCommands = _a.commands;
+            var fixWithId = ts.find(this.getCodeFixes(this.activeFile.fileName), function (a) { return a.fixId === fixId; });
+            ts.Debug.assert(fixWithId !== undefined, "No available code fix has that group id.", function () {
+                return "Expected '" + fixId + "'. Available action ids: " + ts.mapDefined(_this.getCodeFixes(_this.activeFile.fileName), function (a) { return a.fixId; });
+            });
+            ts.Debug.assertEqual(fixWithId.fixAllDescription, fixAllDescription);
+            var _b = this.languageService.getCombinedCodeFix({ type: "file", fileName: this.activeFile.fileName }, fixId, this.formatCodeSettings, ts.defaultPreferences), changes = _b.changes, commands = _b.commands;
+            assert.deepEqual(commands, expectedCommands);
+            assert(changes.every(function (c) { return c.fileName === _this.activeFile.fileName; }), "TODO: support testing codefixes that touch multiple files");
+            this.applyChanges(changes);
+            this.verifyCurrentFileContent(newFileContent);
+        };
+        /**
+         * Applies fixes for the errors in fileName and compares the results to
+         * expectedContents after all fixes have been applied.
+         *
+         * Note: applying one codefix may generate another (eg: remove duplicate implements
+         * may generate an extends -> interface conversion fix).
+         * @param expectedContents The contents of the file after the fixes are applied.
+         * @param fileName The file to check. If not supplied, the current open file is used.
+         */
+        TestState.prototype.verifyFileAfterCodeFix = function (expectedContents, fileName) {
+            fileName = fileName ? fileName : this.activeFile.fileName;
+            this.applyCodeActions(this.getCodeFixes(fileName));
+            var actualContents = this.getFileContent(fileName);
+            if (this.removeWhitespace(actualContents) !== this.removeWhitespace(expectedContents)) {
+                this.raiseError("Actual text doesn't match expected text. Actual:\n" + actualContents + "\n\nExpected:\n" + expectedContents);
+            }
+        };
+        TestState.prototype.verifyCodeFix = function (options) {
+            var fileName = this.activeFile.fileName;
+            var actions = this.getCodeFixes(fileName, options.errorCode, options.preferences);
+            var index = options.index;
+            if (index === undefined) {
+                if (!(actions && actions.length === 1)) {
+                    this.raiseError("Should find exactly one codefix, but " + (actions ? actions.length : "none") + " found. " + (actions ? actions.map(function (a) { return Harness.IO.newLine() + " \"" + a.description + "\""; }) : ""));
+                }
+                index = 0;
+            }
+            else {
+                if (!(actions && actions.length >= index + 1)) {
+                    this.raiseError("Should find at least " + (index + 1) + " codefix(es), but " + (actions ? actions.length : "none") + " found.");
+                }
+            }
+            var action = actions[index];
+            assert.equal(action.description, options.description);
+            for (var _i = 0, _a = action.changes; _i < _a.length; _i++) {
+                var change = _a[_i];
+                this.applyEdits(change.fileName, change.textChanges, /*isFormattingEdit*/ false);
+            }
+            this.verifyNewContent(options, action.changes.map(function (c) { return c.fileName; }));
+        };
+        TestState.prototype.verifyNewContent = function (options, changedFiles) {
+            var assertedChangedFiles = !options.newFileContent || typeof options.newFileContent === "string"
+                ? [this.activeFile.fileName]
+                : ts.getOwnKeys(options.newFileContent);
+            assert.deepEqual(assertedChangedFiles, changedFiles);
+            if (options.newFileContent !== undefined) {
+                assert(!options.newRangeContent);
+                if (typeof options.newFileContent === "string") {
+                    this.verifyCurrentFileContent(options.newFileContent);
+                }
+                else {
+                    for (var fileName in options.newFileContent) {
+                        this.verifyFileContent(fileName, options.newFileContent[fileName]);
+                    }
+                }
+            }
+            else {
+                this.verifyRangeIs(options.newRangeContent, /*includeWhitespace*/ true);
+            }
+        };
+        /**
+         * Rerieves a codefix satisfying the parameters, or undefined if no such codefix is found.
+         * @param fileName Path to file where error should be retrieved from.
+         */
+        TestState.prototype.getCodeFixes = function (fileName, errorCode, preferences) {
+            var _this = this;
+            if (preferences === void 0) { preferences = ts.defaultPreferences; }
+            var diagnosticsForCodeFix = this.getDiagnostics(fileName, /*includeSuggestions*/ true).map(function (diagnostic) { return ({
+                start: diagnostic.start,
+                length: diagnostic.length,
+                code: diagnostic.code
+            }); });
+            return ts.flatMap(ts.deduplicate(diagnosticsForCodeFix, ts.equalOwnProperties), function (diagnostic) {
+                if (errorCode !== undefined && errorCode !== diagnostic.code) {
+                    return;
+                }
+                return _this.languageService.getCodeFixesAtPosition(fileName, diagnostic.start, diagnostic.start + diagnostic.length, [diagnostic.code], _this.formatCodeSettings, preferences);
+            });
+        };
+        TestState.prototype.applyCodeActions = function (actions, index) {
+            if (index === undefined) {
+                if (!(actions && actions.length === 1)) {
+                    this.raiseError("Should find exactly one codefix, but " + (actions ? actions.length : "none") + " found. " + (actions ? actions.map(function (a) { return Harness.IO.newLine() + " \"" + a.description + "\""; }) : ""));
+                }
+                index = 0;
+            }
+            else {
+                if (!(actions && actions.length >= index + 1)) {
+                    this.raiseError("Should find at least " + (index + 1) + " codefix(es), but " + (actions ? actions.length : "none") + " found.");
+                }
+            }
+            this.applyChanges(actions[index].changes);
+        };
+        TestState.prototype.applyChanges = function (changes) {
+            for (var _i = 0, changes_1 = changes; _i < changes_1.length; _i++) {
+                var change = changes_1[_i];
+                this.applyEdits(change.fileName, change.textChanges, /*isFormattingEdit*/ false);
+            }
+        };
+        TestState.prototype.verifyImportFixAtPosition = function (expectedTextArray, errorCode, preferences) {
+            var _this = this;
+            var fileName = this.activeFile.fileName;
+            var ranges = this.getRanges().filter(function (r) { return r.fileName === fileName; });
+            if (ranges.length > 1) {
+                this.raiseError("Exactly one range should be specified in the testfile.");
+            }
+            var range = ts.firstOrUndefined(ranges);
+            var codeFixes = this.getCodeFixes(fileName, errorCode, preferences).filter(function (f) { return f.fixId === undefined; }); // TODO: GH#20315 filter out those that use the import fix ID;
+            if (codeFixes.length === 0) {
+                if (expectedTextArray.length !== 0) {
+                    this.raiseError("No codefixes returned.");
+                }
+                return;
+            }
+            var actualTextArray = [];
+            var scriptInfo = this.languageServiceAdapterHost.getScriptInfo(fileName);
+            var originalContent = scriptInfo.content;
+            for (var _i = 0, codeFixes_1 = codeFixes; _i < codeFixes_1.length; _i++) {
+                var codeFix = codeFixes_1[_i];
+                ts.Debug.assert(codeFix.changes.length === 1);
+                var change = ts.first(codeFix.changes);
+                ts.Debug.assert(change.fileName === fileName);
+                this.applyEdits(change.fileName, change.textChanges, /*isFormattingEdit*/ false);
+                var text = range ? this.rangeText(range) : this.getFileContent(this.activeFile.fileName);
+                actualTextArray.push(text);
+                scriptInfo.updateContent(originalContent);
+            }
+            if (expectedTextArray.length !== actualTextArray.length) {
+                this.raiseError("Expected " + expectedTextArray.length + " import fixes, got " + actualTextArray.length);
+            }
+            ts.zipWith(expectedTextArray, actualTextArray, function (expected, actual, index) {
+                if (expected !== actual) {
+                    _this.raiseError("Import fix at index " + index + " doesn't match.\n" + showTextDiff(expected, actual));
+                }
+            });
+        };
+        TestState.prototype.verifyDocCommentTemplate = function (expected) {
+            var name = "verifyDocCommentTemplate";
+            var actual = this.languageService.getDocCommentTemplateAtPosition(this.activeFile.fileName, this.currentCaretPosition);
+            if (expected === undefined) {
+                if (actual) {
+                    this.raiseError(name + " failed - expected no template but got {newText: \"" + actual.newText + "\", caretOffset: " + actual.caretOffset + "}");
+                }
+                return;
+            }
+            else {
+                if (actual === undefined) {
+                    this.raiseError(name + " failed - expected the template {newText: \"" + expected.newText + "\", caretOffset: \"" + expected.caretOffset + "\"} but got nothing instead");
+                }
+                if (actual.newText !== expected.newText) {
+                    this.raiseError(name + " failed for expected insertion.\n" + showTextDiff(expected.newText, actual.newText));
+                }
+                if (actual.caretOffset !== expected.caretOffset) {
+                    this.raiseError(name + " failed - expected caretOffset: " + expected.caretOffset + "\nactual caretOffset:" + actual.caretOffset);
+                }
+            }
+        };
+        TestState.prototype.verifyBraceCompletionAtPosition = function (negative, openingBrace) {
+            var openBraceMap = ts.createMapFromTemplate({
+                "(": 40 /* openParen */,
+                "{": 123 /* openBrace */,
+                "[": 91 /* openBracket */,
+                "'": 39 /* singleQuote */,
+                '"': 34 /* doubleQuote */,
+                "`": 96 /* backtick */,
+                "<": 60 /* lessThan */
+            });
+            var charCode = openBraceMap.get(openingBrace);
+            if (!charCode) {
+                throw this.raiseError("Invalid openingBrace '" + openingBrace + "' specified.");
+            }
+            var position = this.currentCaretPosition;
+            var validBraceCompletion = this.languageService.isValidBraceCompletionAtPosition(this.activeFile.fileName, position, charCode);
+            if (!negative && !validBraceCompletion) {
+                this.raiseError(position + " is not a valid brace completion position for " + openingBrace);
+            }
+            if (negative && validBraceCompletion) {
+                this.raiseError(position + " is a valid brace completion position for " + openingBrace);
+            }
+        };
+        TestState.prototype.verifyJsxClosingTag = function (map) {
+            for (var markerName in map) {
+                this.goToMarker(markerName);
+                var actual = this.languageService.getJsxClosingTagAtPosition(this.activeFile.fileName, this.currentCaretPosition);
+                assert.deepEqual(actual, map[markerName]);
+            }
+        };
+        TestState.prototype.verifyMatchingBracePosition = function (bracePosition, expectedMatchPosition) {
+            var actual = this.languageService.getBraceMatchingAtPosition(this.activeFile.fileName, bracePosition);
+            if (actual.length !== 2) {
+                this.raiseError("verifyMatchingBracePosition failed - expected result to contain 2 spans, but it had " + actual.length);
+            }
+            var actualMatchPosition = -1;
+            if (bracePosition === actual[0].start) {
+                actualMatchPosition = actual[1].start;
+            }
+            else if (bracePosition === actual[1].start) {
+                actualMatchPosition = actual[0].start;
+            }
+            else {
+                this.raiseError("verifyMatchingBracePosition failed - could not find the brace position: " + bracePosition + " in the returned list: (" + actual[0].start + "," + ts.textSpanEnd(actual[0]) + ") and (" + actual[1].start + "," + ts.textSpanEnd(actual[1]) + ")");
+            }
+            if (actualMatchPosition !== expectedMatchPosition) {
+                this.raiseError("verifyMatchingBracePosition failed - expected: " + actualMatchPosition + ",  actual: " + expectedMatchPosition);
+            }
+        };
+        TestState.prototype.verifyNoMatchingBracePosition = function (bracePosition) {
+            var actual = this.languageService.getBraceMatchingAtPosition(this.activeFile.fileName, bracePosition);
+            if (actual.length !== 0) {
+                this.raiseError("verifyNoMatchingBracePosition failed - expected: 0 spans, actual: " + actual.length);
+            }
+        };
+        TestState.prototype.verifySpanOfEnclosingComment = function (negative, onlyMultiLineDiverges) {
+            var expected = !negative;
+            var position = this.currentCaretPosition;
+            var fileName = this.activeFile.fileName;
+            var actual = !!this.languageService.getSpanOfEnclosingComment(fileName, position, /*onlyMultiLine*/ false);
+            var actualOnlyMultiLine = !!this.languageService.getSpanOfEnclosingComment(fileName, position, /*onlyMultiLine*/ true);
+            if (expected !== actual || onlyMultiLineDiverges === (actual === actualOnlyMultiLine)) {
+                this.raiseError("verifySpanOfEnclosingComment failed:\n                position: '" + position + "'\n                fileName: '" + fileName + "'\n                onlyMultiLineDiverges: '" + onlyMultiLineDiverges + "'\n                actual: '" + actual + "'\n                actualOnlyMultiLine: '" + actualOnlyMultiLine + "'\n                expected: '" + expected + "'.");
+            }
+        };
+        /*
+            Check number of navigationItems which match both searchValue and matchKind,
+            if a filename is passed in, limit the results to that file.
+            Report an error if expected value and actual value do not match.
+        */
+        TestState.prototype.verifyNavigationItemsCount = function (expected, searchValue, matchKind, fileName) {
+            var items = this.languageService.getNavigateToItems(searchValue, /*maxResultCount*/ undefined, fileName);
+            var actual = 0;
+            // Count only the match that match the same MatchKind
+            for (var _i = 0, items_1 = items; _i < items_1.length; _i++) {
+                var item = items_1[_i];
+                if (!matchKind || item.matchKind === matchKind) {
+                    actual++;
+                }
+            }
+            if (expected !== actual) {
+                this.raiseError("verifyNavigationItemsCount failed - found: " + actual + " navigation items, expected: " + expected + ".");
+            }
+        };
+        /*
+            Verify that returned navigationItems from getNavigateToItems have matched searchValue, matchKind, and kind.
+            Report an error if getNavigateToItems does not find any matched searchValue.
+        */
+        TestState.prototype.verifyNavigationItemsListContains = function (name, kind, searchValue, matchKind, fileName, parentName) {
+            var items = this.languageService.getNavigateToItems(searchValue);
+            if (!items || items.length === 0) {
+                this.raiseError("verifyNavigationItemsListContains failed - found 0 navigation items, expected at least one.");
+            }
+            for (var _i = 0, items_2 = items; _i < items_2.length; _i++) {
+                var item = items_2[_i];
+                if (item && item.name === name && item.kind === kind &&
+                    (matchKind === undefined || item.matchKind === matchKind) &&
+                    (fileName === undefined || item.fileName === fileName) &&
+                    (parentName === undefined || item.containerName === parentName)) {
+                    return;
+                }
+            }
+            // if there was an explicit match kind specified, then it should be validated.
+            if (matchKind !== undefined) {
+                var missingItem = { name: name, kind: kind, searchValue: searchValue, matchKind: matchKind, fileName: fileName, parentName: parentName };
+                this.raiseError("verifyNavigationItemsListContains failed - could not find the item: " + stringify(missingItem) + " in the returned list: (" + stringify(items) + ")");
+            }
+        };
+        TestState.prototype.verifyNavigationBar = function (json, options) {
+            this.verifyNavigationTreeOrBar(json, this.languageService.getNavigationBarItems(this.activeFile.fileName), "Bar", options);
+        };
+        TestState.prototype.verifyNavigationTree = function (json, options) {
+            this.verifyNavigationTreeOrBar(json, this.languageService.getNavigationTree(this.activeFile.fileName), "Tree", options);
+        };
+        TestState.prototype.verifyNavigationTreeOrBar = function (json, tree, name, options) {
+            if (JSON.stringify(tree, replacer) !== JSON.stringify(json)) {
+                this.raiseError("verifyNavigation" + name + " failed - expected: " + stringify(json) + ", got: " + stringify(tree, replacer));
+            }
+            function replacer(key, value) {
+                switch (key) {
+                    case "spans":
+                    case "nameSpan":
+                        return options && options.checkSpans ? value : undefined;
+                    case "start":
+                    case "length":
+                        // Never omit the values in a span, even if they are 0.
+                        return value;
+                    case "childItems":
+                        return !value || value.length === 0 ? undefined : value;
+                    default:
+                        // Omit falsy values, those are presumed to be the default.
+                        return value || undefined;
+                }
+            }
+        };
+        TestState.prototype.printNavigationItems = function (searchValue) {
+            var items = this.languageService.getNavigateToItems(searchValue);
+            Harness.IO.log("NavigationItems list (" + items.length + " items)");
+            for (var _i = 0, items_3 = items; _i < items_3.length; _i++) {
+                var item = items_3[_i];
+                Harness.IO.log("name: " + item.name + ", kind: " + item.kind + ", parentName: " + item.containerName + ", fileName: " + item.fileName);
+            }
+        };
+        TestState.prototype.printNavigationBar = function () {
+            var items = this.languageService.getNavigationBarItems(this.activeFile.fileName);
+            Harness.IO.log("Navigation bar (" + items.length + " items)");
+            for (var _i = 0, items_4 = items; _i < items_4.length; _i++) {
+                var item = items_4[_i];
+                Harness.IO.log(ts.repeatString(" ", item.indent) + "name: " + item.text + ", kind: " + item.kind + ", childItems: " + item.childItems.map(function (child) { return child.text; }));
+            }
+        };
+        TestState.prototype.getOccurrencesAtCurrentPosition = function () {
+            return this.languageService.getOccurrencesAtPosition(this.activeFile.fileName, this.currentCaretPosition);
+        };
+        TestState.prototype.verifyOccurrencesAtPositionListContains = function (fileName, start, end, isWriteAccess) {
+            var occurrences = this.getOccurrencesAtCurrentPosition();
+            if (!occurrences || occurrences.length === 0) {
+                return this.raiseError("verifyOccurrencesAtPositionListContains failed - found 0 references, expected at least one.");
+            }
+            for (var _i = 0, occurrences_1 = occurrences; _i < occurrences_1.length; _i++) {
+                var occurrence = occurrences_1[_i];
+                if (occurrence && occurrence.fileName === fileName && occurrence.textSpan.start === start && ts.textSpanEnd(occurrence.textSpan) === end) {
+                    if (typeof isWriteAccess !== "undefined" && occurrence.isWriteAccess !== isWriteAccess) {
+                        this.raiseError("verifyOccurrencesAtPositionListContains failed - item isWriteAccess value does not match, actual: " + occurrence.isWriteAccess + ", expected: " + isWriteAccess + ".");
+                    }
+                    return;
+                }
+            }
+            var missingItem = { fileName: fileName, start: start, end: end, isWriteAccess: isWriteAccess };
+            this.raiseError("verifyOccurrencesAtPositionListContains failed - could not find the item: " + stringify(missingItem) + " in the returned list: (" + stringify(occurrences) + ")");
+        };
+        TestState.prototype.verifyOccurrencesAtPositionListCount = function (expectedCount) {
+            var occurrences = this.getOccurrencesAtCurrentPosition();
+            var actualCount = occurrences ? occurrences.length : 0;
+            if (expectedCount !== actualCount) {
+                this.raiseError("verifyOccurrencesAtPositionListCount failed - actual: " + actualCount + ", expected:" + expectedCount);
+            }
+        };
+        TestState.prototype.getDocumentHighlightsAtCurrentPosition = function (fileNamesToSearch) {
+            var _this = this;
+            var filesToSearch = fileNamesToSearch.map(function (name) { return ts.combinePaths(_this.basePath, name); });
+            return this.languageService.getDocumentHighlights(this.activeFile.fileName, this.currentCaretPosition, filesToSearch);
+        };
+        TestState.prototype.verifyRangesAreOccurrences = function (isWriteAccess) {
+            var ranges = this.getRanges();
+            for (var _i = 0, ranges_3 = ranges; _i < ranges_3.length; _i++) {
+                var r = ranges_3[_i];
+                this.goToRangeStart(r);
+                this.verifyOccurrencesAtPositionListCount(ranges.length);
+                for (var _a = 0, ranges_4 = ranges; _a < ranges_4.length; _a++) {
+                    var range = ranges_4[_a];
+                    this.verifyOccurrencesAtPositionListContains(range.fileName, range.pos, range.end, isWriteAccess);
+                }
+            }
+        };
+        TestState.prototype.verifyRangesWithSameTextAreRenameLocations = function () {
+            var _this = this;
+            this.rangesByText().forEach(function (ranges) { return _this.verifyRangesAreRenameLocations(ranges); });
+        };
+        TestState.prototype.verifyRangesWithSameTextAreDocumentHighlights = function () {
+            var _this = this;
+            this.rangesByText().forEach(function (ranges) { return _this.verifyRangesAreDocumentHighlights(ranges, /*options*/ undefined); });
+        };
+        TestState.prototype.verifyDocumentHighlightsOf = function (startRange, ranges, options) {
+            var fileNames = options && options.filesToSearch || unique(ranges, function (range) { return range.fileName; });
+            this.goToRangeStart(startRange);
+            this.verifyDocumentHighlights(ranges, fileNames);
+        };
+        TestState.prototype.verifyRangesAreDocumentHighlights = function (ranges, options) {
+            ranges = ranges || this.getRanges();
+            var fileNames = options && options.filesToSearch || unique(ranges, function (range) { return range.fileName; });
+            for (var _i = 0, ranges_5 = ranges; _i < ranges_5.length; _i++) {
+                var range = ranges_5[_i];
+                this.goToRangeStart(range);
+                this.verifyDocumentHighlights(ranges, fileNames);
+            }
+        };
+        TestState.prototype.verifyNoDocumentHighlights = function (startRange) {
+            this.goToRangeStart(startRange);
+            var documentHighlights = this.getDocumentHighlightsAtCurrentPosition([this.activeFile.fileName]);
+            var numHighlights = ts.length(documentHighlights);
+            if (numHighlights > 0) {
+                this.raiseError("verifyNoDocumentHighlights failed - unexpectedly got " + numHighlights + " highlights");
+            }
+        };
+        TestState.prototype.verifyDocumentHighlights = function (expectedRanges, fileNames) {
+            var _this = this;
+            if (fileNames === void 0) { fileNames = [this.activeFile.fileName]; }
+            fileNames = ts.map(fileNames, ts.normalizePath);
+            var documentHighlights = this.getDocumentHighlightsAtCurrentPosition(fileNames) || [];
+            for (var _i = 0, documentHighlights_1 = documentHighlights; _i < documentHighlights_1.length; _i++) {
+                var dh = documentHighlights_1[_i];
+                if (fileNames.indexOf(dh.fileName) === -1) {
+                    this.raiseError("verifyDocumentHighlights failed - got highlights in unexpected file name " + dh.fileName);
+                }
+            }
+            var _loop_9 = function (fileName) {
+                var expectedRangesInFile = expectedRanges.filter(function (r) { return ts.normalizePath(r.fileName) === fileName; });
+                var highlights = ts.find(documentHighlights, function (dh) { return dh.fileName === fileName; });
+                var spansInFile = highlights ? highlights.highlightSpans.sort(function (s1, s2) { return s1.textSpan.start - s2.textSpan.start; }) : [];
+                if (expectedRangesInFile.length !== spansInFile.length) {
+                    this_4.raiseError("verifyDocumentHighlights failed - In " + fileName + ", expected " + expectedRangesInFile.length + " highlights, got " + spansInFile.length);
+                }
+                ts.zipWith(expectedRangesInFile, spansInFile, function (expectedRange, span) {
+                    if (span.textSpan.start !== expectedRange.pos || ts.textSpanEnd(span.textSpan) !== expectedRange.end) {
+                        _this.raiseError("verifyDocumentHighlights failed - span does not match, actual: " + stringify(span.textSpan) + ", expected: " + expectedRange.pos + "--" + expectedRange.end);
+                    }
+                });
+            };
+            var this_4 = this;
+            for (var _a = 0, fileNames_1 = fileNames; _a < fileNames_1.length; _a++) {
+                var fileName = fileNames_1[_a];
+                _loop_9(fileName);
+            }
+        };
+        TestState.prototype.verifyCodeFixAvailable = function (negative, expected) {
+            assert(!negative || !expected);
+            var codeFixes = this.getCodeFixes(this.activeFile.fileName);
+            var actuals = codeFixes.map(function (fix) { return ({ description: fix.description, commands: fix.commands }); });
+            this.assertObjectsEqual(actuals, negative ? ts.emptyArray : expected);
+        };
+        TestState.prototype.verifyApplicableRefactorAvailableAtMarker = function (negative, markerName) {
+            var isAvailable = this.getApplicableRefactors(this.getMarkerByName(markerName).position).length > 0;
+            if (negative && isAvailable) {
+                this.raiseError("verifyApplicableRefactorAvailableAtMarker failed - expected no refactor at marker " + markerName + " but found some.");
+            }
+            if (!negative && !isAvailable) {
+                this.raiseError("verifyApplicableRefactorAvailableAtMarker failed - expected a refactor at marker " + markerName + " but found none.");
+            }
+        };
+        TestState.prototype.getSelection = function () {
+            return {
+                pos: this.currentCaretPosition,
+                end: this.selectionEnd === -1 ? this.currentCaretPosition : this.selectionEnd
+            };
+        };
+        TestState.prototype.verifyRefactorAvailable = function (negative, name, actionName) {
+            var refactors = this.getApplicableRefactors(this.getSelection());
+            refactors = refactors.filter(function (r) { return r.name === name && (actionName === undefined || r.actions.some(function (a) { return a.name === actionName; })); });
+            var isAvailable = refactors.length > 0;
+            if (negative) {
+                if (isAvailable) {
+                    this.raiseError("verifyApplicableRefactorAvailableForRange failed - expected no refactor but found: " + refactors.map(function (r) { return r.name; }).join(", "));
+                }
+            }
+            else {
+                if (!isAvailable) {
+                    this.raiseError("verifyApplicableRefactorAvailableForRange failed - expected a refactor but found none.");
+                }
+                if (refactors.length > 1) {
+                    this.raiseError(refactors.length + " available refactors both have name " + name + " and action " + actionName);
+                }
+            }
+        };
+        TestState.prototype.verifyRefactor = function (_a) {
+            var name = _a.name, actionName = _a.actionName, refactors = _a.refactors;
+            var actualRefactors = this.getApplicableRefactors(this.getSelection()).filter(function (r) { return r.name === name && r.actions.some(function (a) { return a.name === actionName; }); });
+            this.assertObjectsEqual(actualRefactors, refactors);
+        };
+        TestState.prototype.verifyApplicableRefactorAvailableForRange = function (negative) {
+            var ranges = this.getRanges();
+            if (!(ranges && ranges.length === 1)) {
+                throw new Error("Exactly one refactor range is allowed per test.");
+            }
+            var isAvailable = this.getApplicableRefactors(ts.first(ranges)).length > 0;
+            if (negative && isAvailable) {
+                this.raiseError("verifyApplicableRefactorAvailableForRange failed - expected no refactor but found some.");
+            }
+            if (!negative && !isAvailable) {
+                this.raiseError("verifyApplicableRefactorAvailableForRange failed - expected a refactor but found none.");
+            }
+        };
+        TestState.prototype.applyRefactor = function (_a) {
+            var refactorName = _a.refactorName, actionName = _a.actionName, actionDescription = _a.actionDescription, newContentWithRenameMarker = _a.newContent;
+            var range = this.getSelection();
+            var refactors = this.getApplicableRefactors(range);
+            var refactorsWithName = refactors.filter(function (r) { return r.name === refactorName; });
+            if (refactorsWithName.length === 0) {
+                this.raiseError("The expected refactor: " + refactorName + " is not available at the marker location.\nAvailable refactors: " + refactors.map(function (r) { return r.name; }));
+            }
+            var action = ts.firstDefined(refactorsWithName, function (refactor) { return refactor.actions.find(function (a) { return a.name === actionName; }); });
+            if (!action) {
+                throw this.raiseError("The expected action: " + actionName + " is not included in: " + ts.flatMap(refactorsWithName, function (r) { return r.actions.map(function (a) { return a.name; }); }));
+            }
+            if (action.description !== actionDescription) {
+                this.raiseError("Expected action description to be " + JSON.stringify(actionDescription) + ", got: " + JSON.stringify(action.description));
+            }
+            var editInfo = this.languageService.getEditsForRefactor(this.activeFile.fileName, this.formatCodeSettings, range, refactorName, actionName, ts.defaultPreferences);
+            for (var _i = 0, _b = editInfo.edits; _i < _b.length; _i++) {
+                var edit = _b[_i];
+                this.applyEdits(edit.fileName, edit.textChanges, /*isFormattingEdit*/ false);
+            }
+            var _c = parseNewContent(), renamePosition = _c.renamePosition, newContent = _c.newContent;
+            this.verifyCurrentFileContent(newContent);
+            if (renamePosition === undefined) {
+                if (editInfo.renameLocation !== undefined) {
+                    this.raiseError("Did not expect a rename location, got " + editInfo.renameLocation);
+                }
+            }
+            else {
+                // TODO: test editInfo.renameFilename value
+                assert.isDefined(editInfo.renameFilename);
+                if (renamePosition !== editInfo.renameLocation) {
+                    this.raiseError("Expected rename position of " + renamePosition + ", but got " + editInfo.renameLocation);
+                }
+            }
+            function parseNewContent() {
+                var renamePosition = newContentWithRenameMarker.indexOf("/*RENAME*/");
+                if (renamePosition === -1) {
+                    return { renamePosition: undefined, newContent: newContentWithRenameMarker };
+                }
+                else {
+                    var newContent_1 = newContentWithRenameMarker.slice(0, renamePosition) + newContentWithRenameMarker.slice(renamePosition + "/*RENAME*/".length);
+                    return { renamePosition: renamePosition, newContent: newContent_1 };
+                }
+            }
+        };
+        TestState.prototype.noMoveToNewFile = function () {
+            for (var _i = 0, _a = this.getRanges(); _i < _a.length; _i++) {
+                var range = _a[_i];
+                for (var _b = 0, _c = this.getApplicableRefactors(range, { allowTextChangesInNewFiles: true }); _b < _c.length; _b++) {
+                    var refactor = _c[_b];
+                    if (refactor.name === "Move to a new file") {
+                        ts.Debug.fail("Did not expect to get 'move to a new file' refactor");
+                    }
+                }
+            }
+        };
+        TestState.prototype.moveToNewFile = function (options) {
+            assert(this.getRanges().length === 1);
+            var range = this.getRanges()[0];
+            var refactor = ts.find(this.getApplicableRefactors(range, { allowTextChangesInNewFiles: true }), function (r) { return r.name === "Move to a new file"; });
+            assert(refactor.actions.length === 1);
+            var action = ts.first(refactor.actions);
+            assert(action.name === "Move to a new file" && action.description === "Move to a new file");
+            var editInfo = this.languageService.getEditsForRefactor(this.activeFile.fileName, this.formatCodeSettings, range, refactor.name, action.name, options.preferences || ts.defaultPreferences);
+            this.testNewFileContents(editInfo.edits, options.newFileContents);
+        };
+        TestState.prototype.testNewFileContents = function (edits, newFileContents) {
+            var _loop_10 = function (edit) {
+                var newContent = newFileContents[edit.fileName];
+                if (newContent === undefined) {
+                    this_5.raiseError("There was an edit in " + edit.fileName + " but new content was not specified.");
+                }
+                if (this_5.testData.files.some(function (f) { return f.fileName === edit.fileName; })) {
+                    this_5.applyEdits(edit.fileName, edit.textChanges, /*isFormattingEdit*/ false);
+                    this_5.openFile(edit.fileName);
+                    this_5.verifyCurrentFileContent(newContent);
+                }
+                else {
+                    assert(edit.textChanges.length === 1);
+                    var change = ts.first(edit.textChanges);
+                    assert.deepEqual(change.span, ts.createTextSpan(0, 0));
+                    assert.equal(change.newText, newContent, "Content for " + edit.fileName);
+                }
+            };
+            var this_5 = this;
+            for (var _i = 0, edits_1 = edits; _i < edits_1.length; _i++) {
+                var edit = edits_1[_i];
+                _loop_10(edit);
+            }
+            var _loop_11 = function (fileName) {
+                assert(edits.some(function (e) { return e.fileName === fileName; }));
+            };
+            for (var fileName in newFileContents) {
+                _loop_11(fileName);
+            }
+        };
+        TestState.prototype.verifyFileAfterApplyingRefactorAtMarker = function (markerName, expectedContent, refactorNameToApply, actionName, formattingOptions) {
+            formattingOptions = formattingOptions || this.formatCodeSettings;
+            var markerPos = this.getMarkerByName(markerName).position;
+            var applicableRefactors = this.languageService.getApplicableRefactors(this.activeFile.fileName, markerPos, ts.defaultPreferences);
+            var applicableRefactorToApply = ts.find(applicableRefactors, function (refactor) { return refactor.name === refactorNameToApply; });
+            if (!applicableRefactorToApply) {
+                this.raiseError("The expected refactor: " + refactorNameToApply + " is not available at the marker location.");
+            }
+            var editInfo = this.languageService.getEditsForRefactor(this.activeFile.fileName, formattingOptions, markerPos, refactorNameToApply, actionName, ts.defaultPreferences);
+            for (var _i = 0, _a = editInfo.edits; _i < _a.length; _i++) {
+                var edit = _a[_i];
+                this.applyEdits(edit.fileName, edit.textChanges, /*isFormattingEdit*/ false);
+            }
+            var actualContent = this.getFileContent(this.activeFile.fileName);
+            if (actualContent !== expectedContent) {
+                this.raiseError("verifyFileAfterApplyingRefactors failed:\n" + showTextDiff(expectedContent, actualContent));
+            }
+        };
+        TestState.prototype.printAvailableCodeFixes = function () {
+            var codeFixes = this.getCodeFixes(this.activeFile.fileName);
+            Harness.IO.log(stringify(codeFixes));
+        };
+        // Get the text of the entire line the caret is currently at
+        TestState.prototype.getCurrentLineContent = function () {
+            var text = this.getFileContent(this.activeFile.fileName);
+            var pos = this.currentCaretPosition;
+            var startPos = pos, endPos = pos;
+            while (startPos > 0) {
+                var ch = text.charCodeAt(startPos - 1);
+                if (ch === 13 /* carriageReturn */ || ch === 10 /* lineFeed */) {
+                    break;
+                }
+                startPos--;
+            }
+            while (endPos < text.length) {
+                var ch = text.charCodeAt(endPos);
+                if (ch === 13 /* carriageReturn */ || ch === 10 /* lineFeed */) {
+                    break;
+                }
+                endPos++;
+            }
+            return text.substring(startPos, endPos);
+        };
+        TestState.prototype.assertItemInCompletionList = function (items, entryId, text, documentation, kind, spanIndex, hasAction, options) {
+            var _this = this;
+            var eq = function (a, b, msg) {
+                assert.deepEqual(a, b, _this.assertionMessageAtLastKnownMarker(msg + " for " + stringify(entryId)));
+            };
+            var matchingItems = items.filter(function (item) { return item.name === entryId.name && item.source === entryId.source; });
+            if (matchingItems.length === 0) {
+                var itemsString = items.map(function (item) { return stringify({ name: item.name, source: item.source, kind: item.kind }); }).join(",\n");
+                this.raiseError("Expected \"" + stringify({ entryId: entryId, text: text, documentation: documentation, kind: kind }) + "\" to be in list [" + itemsString + "]");
+            }
+            else if (matchingItems.length > 1) {
+                this.raiseError("Found duplicate completion items for " + stringify(entryId));
+            }
+            var item = matchingItems[0];
+            if (documentation !== undefined || text !== undefined || entryId.source !== undefined) {
+                var details = this.getCompletionEntryDetails(item.name, item.source);
+                if (documentation !== undefined) {
+                    eq(ts.displayPartsToString(details.documentation), documentation, "completion item documentation");
+                }
+                if (text !== undefined) {
+                    eq(ts.displayPartsToString(details.displayParts), text, "completion item detail text");
+                }
+                if (entryId.source === undefined) {
+                    eq(options && options.sourceDisplay, /*b*/ undefined, "source display");
+                }
+                else {
+                    eq(details.source, [ts.textPart(options.sourceDisplay)], "source display");
+                }
+            }
+            if (kind !== undefined) {
+                if (typeof kind === "string") {
+                    eq(item.kind, kind, "completion item kind");
+                }
+                else {
+                    if (kind.kind) {
+                        eq(item.kind, kind.kind, "completion item kind");
+                    }
+                    if (kind.kindModifiers !== undefined) {
+                        eq(item.kindModifiers, kind.kindModifiers, "completion item kindModifiers");
+                    }
+                }
+            }
+            if (spanIndex !== undefined) {
+                var span = this.getTextSpanForRangeAtIndex(spanIndex);
+                assert.isTrue(TestState.textSpansEqual(span, item.replacementSpan), this.assertionMessageAtLastKnownMarker(stringify(span) + " does not equal " + stringify(item.replacementSpan) + " replacement span for " + stringify(entryId)));
+            }
+            eq(item.hasAction, hasAction, "hasAction");
+            eq(item.isRecommended, options && options.isRecommended, "isRecommended");
+            eq(item.insertText, options && options.insertText, "insertText");
+            eq(item.replacementSpan, options && options.replacementSpan && ts.createTextSpanFromRange(options.replacementSpan), "replacementSpan");
+        };
+        TestState.prototype.findFile = function (indexOrName) {
+            if (typeof indexOrName === "number") {
+                var index = indexOrName;
+                if (index >= this.testData.files.length) {
+                    throw new Error("File index (" + index + ") in openFile was out of range. There are only " + this.testData.files.length + " files in this test.");
+                }
+                else {
+                    return this.testData.files[index];
+                }
+            }
+            else if (ts.isString(indexOrName)) {
+                var name_1 = ts.normalizePath(indexOrName);
+                // names are stored in the compiler with this relative path, this allows people to use goTo.file on just the fileName
+                name_1 = name_1.indexOf("/") === -1 ? (this.basePath + "/" + name_1) : name_1;
+                var availableNames_1 = [];
+                var result = ts.forEach(this.testData.files, function (file) {
+                    var fn = ts.normalizePath(file.fileName);
+                    if (fn) {
+                        if (fn === name_1) {
+                            return file;
+                        }
+                        availableNames_1.push(fn);
+                    }
+                });
+                if (!result) {
+                    throw new Error("No test file named \"" + name_1 + "\" exists. Available file names are: " + availableNames_1.join(", "));
+                }
+                return result;
+            }
+            else {
+                return ts.Debug.assertNever(indexOrName);
+            }
+        };
+        TestState.prototype.getLineColStringAtPosition = function (position) {
+            var pos = this.languageServiceAdapterHost.positionToLineAndCharacter(this.activeFile.fileName, position);
+            return "line " + (pos.line + 1) + ", col " + pos.character;
+        };
+        TestState.prototype.getTextSpanForRangeAtIndex = function (index) {
+            var ranges = this.getRanges();
+            if (ranges.length > index) {
+                return ts.createTextSpanFromRange(ranges[index]);
+            }
+            else {
+                throw this.raiseError("Supplied span index: " + index + " does not exist in range list of size: " + ranges.length);
+            }
+        };
+        TestState.prototype.getMarkerByName = function (markerName) {
+            var markerPos = this.testData.markerPositions.get(markerName);
+            if (markerPos === undefined) {
+                throw new Error("Unknown marker \"" + markerName + "\" Available markers: " + this.getMarkerNames().map(function (m) { return "\"" + m + "\""; }).join(", "));
+            }
+            else {
+                return markerPos;
+            }
+        };
+        TestState.prototype.setCancelled = function (numberOfCalls) {
+            this.cancellationToken.setCancelled(numberOfCalls);
+        };
+        TestState.prototype.resetCancelled = function () {
+            this.cancellationToken.resetCancelled();
+        };
+        TestState.textSpansEqual = function (a, b) {
+            return !!a && !!b && a.start === b.start && a.length === b.length;
+        };
+        TestState.prototype.getEditsForFileRename = function (options) {
+            var changes = this.languageService.getEditsForFileRename(options.oldPath, options.newPath, this.formatCodeSettings, ts.defaultPreferences);
+            this.testNewFileContents(changes, options.newFileContents);
+        };
+        TestState.prototype.getApplicableRefactors = function (positionOrRange, preferences) {
+            if (preferences === void 0) { preferences = ts.defaultPreferences; }
+            return this.languageService.getApplicableRefactors(this.activeFile.fileName, positionOrRange, preferences) || ts.emptyArray;
+        };
+        return TestState;
+    }());
+    FourSlash.TestState = TestState;
+    function runFourSlashTest(basePath, testType, fileName) {
+        var content = Harness.IO.readFile(fileName);
+        runFourSlashTestContent(basePath, testType, content, fileName);
+    }
+    FourSlash.runFourSlashTest = runFourSlashTest;
+    function runFourSlashTestContent(basePath, testType, content, fileName) {
+        // Give file paths an absolute path for the virtual file system
+        var absoluteBasePath = ts.combinePaths(Harness.virtualFileSystemRoot, basePath);
+        var absoluteFileName = ts.combinePaths(Harness.virtualFileSystemRoot, fileName);
+        // Parse out the files and their metadata
+        var testData = parseTestData(absoluteBasePath, content, absoluteFileName);
+        var state = new TestState(absoluteBasePath, testType, testData);
+        var output = ts.transpileModule(content, { reportDiagnostics: true });
+        if (output.diagnostics.length > 0) {
+            throw new Error("Syntax error in " + absoluteBasePath + ": " + output.diagnostics[0].messageText);
+        }
+        runCode(output.outputText, state);
+    }
+    FourSlash.runFourSlashTestContent = runFourSlashTestContent;
+    function runCode(code, state) {
+        // Compile and execute the test
+        var wrappedCode = "(function(test, goTo, verify, edit, debug, format, cancellation, classification, verifyOperationIsCancelled) {\n" + code + "\n})";
+        try {
+            var test_1 = new FourSlashInterface.Test(state);
+            var goTo = new FourSlashInterface.GoTo(state);
+            var verify = new FourSlashInterface.Verify(state);
+            var edit = new FourSlashInterface.Edit(state);
+            var debug = new FourSlashInterface.Debug(state);
+            var format = new FourSlashInterface.Format(state);
+            var cancellation = new FourSlashInterface.Cancellation(state);
+            var f = eval(wrappedCode);
+            f(test_1, goTo, verify, edit, debug, format, cancellation, FourSlashInterface.Classification, verifyOperationIsCancelled);
+        }
+        catch (err) {
+            throw err;
+        }
+    }
+    function chompLeadingSpace(content) {
+        var lines = content.split("\n");
+        for (var _i = 0, lines_4 = lines; _i < lines_4.length; _i++) {
+            var line = lines_4[_i];
+            if ((line.length !== 0) && (line.charAt(0) !== " ")) {
+                return content;
+            }
+        }
+        return lines.map(function (s) { return s.substr(1); }).join("\n");
+    }
+    function parseTestData(basePath, contents, fileName) {
+        // Regex for parsing options in the format "@Alpha: Value of any sort"
+        var optionRegex = /^\s*@(\w+): (.*)\s*/;
+        // List of all the subfiles we've parsed out
+        var files = [];
+        // Global options
+        var globalOptions = {};
+        // Marker positions
+        // Split up the input file by line
+        // Note: IE JS engine incorrectly handles consecutive delimiters here when using RegExp split, so
+        // we have to string-based splitting instead and try to figure out the delimiting chars
+        var lines = contents.split("\n");
+        var markerPositions = ts.createMap();
+        var markers = [];
+        var ranges = [];
+        // Stuff related to the subfile we're parsing
+        var currentFileContent;
+        var currentFileName = fileName;
+        var currentFileSymlinks;
+        var currentFileOptions = {};
+        function nextFile() {
+            if (currentFileContent === undefined)
+                return;
+            var file = parseFileContent(currentFileContent, currentFileName, markerPositions, markers, ranges);
+            file.fileOptions = currentFileOptions;
+            file.symlinks = currentFileSymlinks;
+            // Store result file
+            files.push(file);
+            currentFileContent = undefined;
+            currentFileOptions = {};
+            currentFileName = fileName;
+            currentFileSymlinks = undefined;
+        }
+        for (var _i = 0, lines_5 = lines; _i < lines_5.length; _i++) {
+            var line = lines_5[_i];
+            if (line.length > 0 && line.charAt(line.length - 1) === "\r") {
+                line = line.substr(0, line.length - 1);
+            }
+            if (line.substr(0, 4) === "////") {
+                var text = line.substr(4);
+                currentFileContent = currentFileContent === undefined ? text : currentFileContent + "\n" + text;
+            }
+            else if (line.substr(0, 2) === "//") {
+                // Comment line, check for global/file @options and record them
+                var match = optionRegex.exec(line.substr(2));
+                if (match) {
+                    var _a = match.slice(1), key = _a[0], value = _a[1];
+                    if (!ts.contains(fileMetadataNames, key)) {
+                        // Check if the match is already existed in the global options
+                        if (globalOptions[key] !== undefined) {
+                            throw new Error("Global option '" + key + "' already exists");
+                        }
+                        globalOptions[key] = value;
+                    }
+                    else {
+                        switch (key) {
+                            case "Filename" /* fileName */:
+                                // Found an @FileName directive, if this is not the first then create a new subfile
+                                nextFile();
+                                currentFileName = ts.isRootedDiskPath(value) ? value : basePath + "/" + value;
+                                currentFileOptions[key] = value;
+                                break;
+                            case "Symlink" /* symlink */:
+                                currentFileSymlinks = ts.append(currentFileSymlinks, value);
+                                break;
+                            default:
+                                // Add other fileMetadata flag
+                                currentFileOptions[key] = value;
+                        }
+                    }
+                }
+            }
+            // Previously blank lines between fourslash content caused it to be considered as 2 files,
+            // Remove this behavior since it just causes errors now
+            else if (line !== "") {
+                // Code line, terminate current subfile if there is one
+                nextFile();
+            }
+        }
+        // @Filename is the only directive that can be used in a test that contains tsconfig.json file.
+        var config = ts.find(files, isConfig);
+        if (config) {
+            var directive = getNonFileNameOptionInFileList(files);
+            if (!directive) {
+                directive = getNonFileNameOptionInObject(globalOptions);
+            }
+            if (directive) {
+                throw Error("It is not allowed to use " + config.fileName + " along with directive '" + directive + "'");
+            }
+        }
+        return {
+            markerPositions: markerPositions,
+            markers: markers,
+            globalOptions: globalOptions,
+            files: files,
+            ranges: ranges
+        };
+    }
+    function isConfig(file) {
+        return Harness.getConfigNameFromFileName(file.fileName) !== undefined;
+    }
+    function getNonFileNameOptionInFileList(files) {
+        return ts.forEach(files, function (f) { return getNonFileNameOptionInObject(f.fileOptions); });
+    }
+    function getNonFileNameOptionInObject(optionObject) {
+        for (var option in optionObject) {
+            if (option !== "Filename" /* fileName */) {
+                return option;
+            }
+        }
+        return undefined;
+    }
+    var State;
+    (function (State) {
+        State[State["none"] = 0] = "none";
+        State[State["inSlashStarMarker"] = 1] = "inSlashStarMarker";
+        State[State["inObjectMarker"] = 2] = "inObjectMarker";
+    })(State || (State = {}));
+    function reportError(fileName, line, col, message) {
+        var errorMessage = fileName + "(" + line + "," + col + "): " + message;
+        throw new Error(errorMessage);
+    }
+    function recordObjectMarker(fileName, location, text, markerMap, markers) {
+        var markerValue;
+        try {
+            // Attempt to parse the marker value as JSON
+            markerValue = JSON.parse("{ " + text + " }");
+        }
+        catch (e) {
+            reportError(fileName, location.sourceLine, location.sourceColumn, "Unable to parse marker text " + e.message);
+        }
+        if (markerValue === undefined) {
+            reportError(fileName, location.sourceLine, location.sourceColumn, "Object markers can not be empty");
+            return undefined;
+        }
+        var marker = {
+            fileName: fileName,
+            position: location.position,
+            data: markerValue
+        };
+        // Object markers can be anonymous
+        if (markerValue.name) {
+            markerMap.set(markerValue.name, marker);
+        }
+        markers.push(marker);
+        return marker;
+    }
+    function recordMarker(fileName, location, name, markerMap, markers) {
+        var marker = {
+            fileName: fileName,
+            position: location.position
+        };
+        // Verify markers for uniqueness
+        if (markerMap.has(name)) {
+            var message = "Marker '" + name + "' is duplicated in the source file contents.";
+            reportError(marker.fileName, location.sourceLine, location.sourceColumn, message);
+            return undefined;
+        }
+        else {
+            markerMap.set(name, marker);
+            markers.push(marker);
+            return marker;
+        }
+    }
+    function parseFileContent(content, fileName, markerMap, markers, ranges) {
+        content = chompLeadingSpace(content);
+        // Any slash-star comment with a character not in this string is not a marker.
+        var validMarkerChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz$1234567890_";
+        /// The file content (minus metacharacters) so far
+        var output = "";
+        /// The current marker (or maybe multi-line comment?) we're parsing, possibly
+        var openMarker;
+        /// A stack of the open range markers that are still unclosed
+        var openRanges = [];
+        /// A list of ranges we've collected so far */
+        var localRanges = [];
+        /// The latest position of the start of an unflushed plain text area
+        var lastNormalCharPosition = 0;
+        /// The total number of metacharacters removed from the file (so far)
+        var difference = 0;
+        /// The fourslash file state object we are generating
+        var state = 0 /* none */;
+        /// Current position data
+        var line = 1;
+        var column = 1;
+        var flush = function (lastSafeCharIndex) {
+            output = output + content.substr(lastNormalCharPosition, lastSafeCharIndex === undefined ? undefined : lastSafeCharIndex - lastNormalCharPosition);
+        };
+        if (content.length > 0) {
+            var previousChar = content.charAt(0);
+            for (var i = 1; i < content.length; i++) {
+                var currentChar = content.charAt(i);
+                switch (state) {
+                    case 0 /* none */:
+                        if (previousChar === "[" && currentChar === "|") {
+                            // found a range start
+                            openRanges.push({
+                                position: (i - 1) - difference,
+                                sourcePosition: i - 1,
+                                sourceLine: line,
+                                sourceColumn: column,
+                            });
+                            // copy all text up to marker position
+                            flush(i - 1);
+                            lastNormalCharPosition = i + 1;
+                            difference += 2;
+                        }
+                        else if (previousChar === "|" && currentChar === "]") {
+                            // found a range end
+                            var rangeStart = openRanges.pop();
+                            if (!rangeStart) {
+                                throw reportError(fileName, line, column, "Found range end with no matching start.");
+                            }
+                            var range = {
+                                fileName: fileName,
+                                pos: rangeStart.position,
+                                end: (i - 1) - difference,
+                                marker: rangeStart.marker
+                            };
+                            localRanges.push(range);
+                            // copy all text up to range marker position
+                            flush(i - 1);
+                            lastNormalCharPosition = i + 1;
+                            difference += 2;
+                        }
+                        else if (previousChar === "/" && currentChar === "*") {
+                            // found a possible marker start
+                            state = 1 /* inSlashStarMarker */;
+                            openMarker = {
+                                position: (i - 1) - difference,
+                                sourcePosition: i - 1,
+                                sourceLine: line,
+                                sourceColumn: column,
+                            };
+                        }
+                        else if (previousChar === "{" && currentChar === "|") {
+                            // found an object marker start
+                            state = 2 /* inObjectMarker */;
+                            openMarker = {
+                                position: (i - 1) - difference,
+                                sourcePosition: i - 1,
+                                sourceLine: line,
+                                sourceColumn: column,
+                            };
+                            flush(i - 1);
+                        }
+                        break;
+                    case 2 /* inObjectMarker */:
+                        // Object markers are only ever terminated by |} and have no content restrictions
+                        if (previousChar === "|" && currentChar === "}") {
+                            // Record the marker
+                            var objectMarkerNameText = content.substring(openMarker.sourcePosition + 2, i - 1).trim();
+                            var marker = recordObjectMarker(fileName, openMarker, objectMarkerNameText, markerMap, markers);
+                            if (openRanges.length > 0) {
+                                openRanges[openRanges.length - 1].marker = marker;
+                            }
+                            // Set the current start to point to the end of the current marker to ignore its text
+                            lastNormalCharPosition = i + 1;
+                            difference += i + 1 - openMarker.sourcePosition;
+                            // Reset the state
+                            openMarker = undefined;
+                            state = 0 /* none */;
+                        }
+                        break;
+                    case 1 /* inSlashStarMarker */:
+                        if (previousChar === "*" && currentChar === "/") {
+                            // Record the marker
+                            // start + 2 to ignore the */, -1 on the end to ignore the * (/ is next)
+                            var markerNameText = content.substring(openMarker.sourcePosition + 2, i - 1).trim();
+                            var marker = recordMarker(fileName, openMarker, markerNameText, markerMap, markers);
+                            if (openRanges.length > 0) {
+                                openRanges[openRanges.length - 1].marker = marker;
+                            }
+                            // Set the current start to point to the end of the current marker to ignore its text
+                            flush(openMarker.sourcePosition);
+                            lastNormalCharPosition = i + 1;
+                            difference += i + 1 - openMarker.sourcePosition;
+                            // Reset the state
+                            openMarker = undefined;
+                            state = 0 /* none */;
+                        }
+                        else if (validMarkerChars.indexOf(currentChar) < 0) {
+                            if (currentChar === "*" && i < content.length - 1 && content.charAt(i + 1) === "/") {
+                                // The marker is about to be closed, ignore the 'invalid' char
+                            }
+                            else {
+                                // We've hit a non-valid marker character, so we were actually in a block comment
+                                // Bail out the text we've gathered so far back into the output
+                                flush(i);
+                                lastNormalCharPosition = i;
+                                openMarker = undefined;
+                                state = 0 /* none */;
+                            }
+                        }
+                        break;
+                }
+                if (currentChar === "\n" && previousChar === "\r") {
+                    // Ignore trailing \n after a \r
+                    continue;
+                }
+                else if (currentChar === "\n" || currentChar === "\r") {
+                    line++;
+                    column = 1;
+                    continue;
+                }
+                column++;
+                previousChar = currentChar;
+            }
+        }
+        // Add the remaining text
+        flush(/*lastSafeCharIndex*/ undefined);
+        if (openRanges.length > 0) {
+            var openRange = openRanges[0];
+            reportError(fileName, openRange.sourceLine, openRange.sourceColumn, "Unterminated range.");
+        }
+        if (openMarker) {
+            reportError(fileName, openMarker.sourceLine, openMarker.sourceColumn, "Unterminated marker.");
+        }
+        // put ranges in the correct order
+        localRanges = localRanges.sort(function (a, b) { return a.pos < b.pos ? -1 : 1; });
+        localRanges.forEach(function (r) { ranges.push(r); });
+        return {
+            content: output,
+            fileOptions: {},
+            version: 0,
+            fileName: fileName,
+        };
+    }
+    function stringify(data, replacer) {
+        return JSON.stringify(data, replacer, 2);
+    }
+    /** Collects an array of unique outputs. */
+    function unique(inputs, getOutput) {
+        var set = ts.createMap();
+        for (var _i = 0, inputs_2 = inputs; _i < inputs_2.length; _i++) {
+            var input = inputs_2[_i];
+            var out = getOutput(input);
+            set.set(out, true);
+        }
+        return ts.arrayFrom(set.keys());
+    }
+    function toArray(x) {
+        return ts.isArray(x) ? x : [x];
+    }
+    function makeWhitespaceVisible(text) {
+        return text.replace(/ /g, "\u00B7").replace(/\r/g, "\u00B6").replace(/\n/g, "\u2193\n").replace(/\t/g, "\u2192\   ");
+    }
+    function showTextDiff(expected, actual) {
+        // Only show whitespace if the difference is whitespace-only.
+        if (differOnlyByWhitespace(expected, actual)) {
+            expected = makeWhitespaceVisible(expected);
+            actual = makeWhitespaceVisible(actual);
+        }
+        return "Expected:\n" + expected + "\nActual:\n" + actual;
+    }
+    function differOnlyByWhitespace(a, b) {
+        return stripWhitespace(a) === stripWhitespace(b);
+    }
+    function stripWhitespace(s) {
+        return s.replace(/\s/g, "");
+    }
+    function findDuplicatedElement(a, equal) {
+        for (var i = 0; i < a.length; i++) {
+            for (var j = i + 1; j < a.length; j++) {
+                if (equal(a[i], a[j])) {
+                    return a[i];
+                }
+            }
+        }
+    }
+})(FourSlash || (FourSlash = {}));
+var FourSlashInterface;
+(function (FourSlashInterface) {
+    var Test = /** @class */ (function () {
+        function Test(state) {
+            this.state = state;
+        }
+        Test.prototype.markers = function () {
+            return this.state.getMarkers();
+        };
+        Test.prototype.markerNames = function () {
+            return this.state.getMarkerNames();
+        };
+        Test.prototype.marker = function (name) {
+            return this.state.getMarkerByName(name);
+        };
+        Test.prototype.markerName = function (m) {
+            return this.state.markerName(m);
+        };
+        Test.prototype.ranges = function () {
+            return this.state.getRanges();
+        };
+        Test.prototype.spans = function () {
+            return this.ranges().map(function (r) { return ts.createTextSpan(r.pos, r.end - r.pos); });
+        };
+        Test.prototype.rangesByText = function () {
+            return this.state.rangesByText();
+        };
+        Test.prototype.markerByName = function (s) {
+            return this.state.getMarkerByName(s);
+        };
+        Test.prototype.symbolsInScope = function (range) {
+            return this.state.symbolsInScope(range);
+        };
+        Test.prototype.setTypesRegistry = function (map) {
+            this.state.setTypesRegistry(map);
+        };
+        return Test;
+    }());
+    FourSlashInterface.Test = Test;
+    var GoTo = /** @class */ (function () {
+        function GoTo(state) {
+            this.state = state;
+        }
+        // Moves the caret to the specified marker,
+        // or the anonymous marker ('/**/') if no name
+        // is given
+        GoTo.prototype.marker = function (name) {
+            this.state.goToMarker(name);
+        };
+        GoTo.prototype.eachMarker = function (a, b) {
+            var _this = this;
+            var markers = typeof a === "function" ? this.state.getMarkers() : a.map(function (m) { return _this.state.getMarkerByName(m); });
+            this.state.goToEachMarker(markers, typeof a === "function" ? a : b);
+        };
+        GoTo.prototype.rangeStart = function (range) {
+            this.state.goToRangeStart(range);
+        };
+        GoTo.prototype.eachRange = function (action) {
+            this.state.goToEachRange(action);
+        };
+        GoTo.prototype.bof = function () {
+            this.state.goToBOF();
+        };
+        GoTo.prototype.eof = function () {
+            this.state.goToEOF();
+        };
+        GoTo.prototype.implementation = function () {
+            this.state.goToImplementation();
+        };
+        GoTo.prototype.position = function (position, fileNameOrIndex) {
+            if (fileNameOrIndex !== undefined) {
+                this.file(fileNameOrIndex);
+            }
+            this.state.goToPosition(position);
+        };
+        // Opens a file, given either its index as it
+        // appears in the test source, or its filename
+        // as specified in the test metadata
+        GoTo.prototype.file = function (indexOrName, content, scriptKindName) {
+            this.state.openFile(indexOrName, content, scriptKindName);
+        };
+        GoTo.prototype.select = function (startMarker, endMarker) {
+            this.state.select(startMarker, endMarker);
+        };
+        GoTo.prototype.selectRange = function (range) {
+            this.state.selectRange(range);
+        };
+        return GoTo;
+    }());
+    FourSlashInterface.GoTo = GoTo;
+    var VerifyNegatable = /** @class */ (function () {
+        function VerifyNegatable(state, negative) {
+            if (negative === void 0) { negative = false; }
+            this.state = state;
+            this.negative = negative;
+            this.allowedClassElementKeywords = [
+                "public",
+                "private",
+                "protected",
+                "static",
+                "abstract",
+                "readonly",
+                "get",
+                "set",
+                "constructor",
+                "async"
+            ];
+            this.allowedConstructorParameterKeywords = [
+                "public",
+                "private",
+                "protected",
+                "readonly",
+            ];
+            if (!negative) {
+                this.not = new VerifyNegatable(state, true);
+            }
+        }
+        VerifyNegatable.prototype.completionListCount = function (expectedCount) {
+            this.state.verifyCompletionListCount(expectedCount, this.negative);
+        };
+        // Verifies the completion list contains the specified symbol. The
+        // completion list is brought up if necessary
+        VerifyNegatable.prototype.completionListContains = function (entryId, text, documentation, kind, spanIndex, hasAction, options) {
+            if (typeof entryId === "string") {
+                entryId = { name: entryId, source: undefined };
+            }
+            if (this.negative) {
+                this.state.verifyCompletionListDoesNotContain(entryId, text, documentation, kind, spanIndex, options);
+            }
+            else {
+                this.state.verifyCompletionListContains(entryId, text, documentation, kind, spanIndex, hasAction, options);
+            }
+        };
+        // Verifies the completion list items count to be greater than the specified amount. The
+        // completion list is brought up if necessary
+        VerifyNegatable.prototype.completionListItemsCountIsGreaterThan = function (count) {
+            this.state.verifyCompletionListItemsCountIsGreaterThan(count, this.negative);
+        };
+        VerifyNegatable.prototype.assertHasRanges = function (ranges) {
+            assert(ranges.length !== 0, "Array of ranges is expected to be non-empty");
+        };
+        VerifyNegatable.prototype.completionListIsEmpty = function () {
+            this.state.verifyCompletionListIsEmpty(this.negative);
+        };
+        VerifyNegatable.prototype.completionListContainsClassElementKeywords = function () {
+            for (var _i = 0, _a = this.allowedClassElementKeywords; _i < _a.length; _i++) {
+                var keyword = _a[_i];
+                this.completionListContains(keyword, keyword, /*documentation*/ undefined, "keyword");
+            }
+        };
+        VerifyNegatable.prototype.completionListContainsConstructorParameterKeywords = function () {
+            for (var _i = 0, _a = this.allowedConstructorParameterKeywords; _i < _a.length; _i++) {
+                var keyword = _a[_i];
+                this.completionListContains(keyword, keyword, /*documentation*/ undefined, "keyword");
+            }
+        };
+        VerifyNegatable.prototype.completionListIsGlobal = function (expected) {
+            this.state.verifyCompletionListIsGlobal(expected);
+        };
+        VerifyNegatable.prototype.completionListAllowsNewIdentifier = function () {
+            this.state.verifyCompletionListAllowsNewIdentifier(this.negative);
+        };
+        VerifyNegatable.prototype.noSignatureHelp = function () {
+            var markers = [];
+            for (var _i = 0; _i < arguments.length; _i++) {
+                markers[_i] = arguments[_i];
+            }
+            this.state.verifyNoSignatureHelp(markers);
+        };
+        VerifyNegatable.prototype.signatureHelp = function () {
+            var options = [];
+            for (var _i = 0; _i < arguments.length; _i++) {
+                options[_i] = arguments[_i];
+            }
+            this.state.verifySignatureHelp(options);
+        };
+        VerifyNegatable.prototype.errorExistsBetweenMarkers = function (startMarker, endMarker) {
+            this.state.verifyErrorExistsBetweenMarkers(startMarker, endMarker, !this.negative);
+        };
+        VerifyNegatable.prototype.errorExistsAfterMarker = function (markerName) {
+            if (markerName === void 0) { markerName = ""; }
+            this.state.verifyErrorExistsAfterMarker(markerName, !this.negative, /*after*/ true);
+        };
+        VerifyNegatable.prototype.errorExistsBeforeMarker = function (markerName) {
+            if (markerName === void 0) { markerName = ""; }
+            this.state.verifyErrorExistsAfterMarker(markerName, !this.negative, /*after*/ false);
+        };
+        VerifyNegatable.prototype.quickInfoExists = function () {
+            this.state.verifyQuickInfoExists(this.negative);
+        };
+        VerifyNegatable.prototype.typeDefinitionCountIs = function (expectedCount) {
+            this.state.verifyTypeDefinitionsCount(this.negative, expectedCount);
+        };
+        VerifyNegatable.prototype.implementationListIsEmpty = function () {
+            this.state.verifyImplementationListIsEmpty(this.negative);
+        };
+        VerifyNegatable.prototype.isValidBraceCompletionAtPosition = function (openingBrace) {
+            this.state.verifyBraceCompletionAtPosition(this.negative, openingBrace);
+        };
+        VerifyNegatable.prototype.jsxClosingTag = function (map) {
+            this.state.verifyJsxClosingTag(map);
+        };
+        VerifyNegatable.prototype.isInCommentAtPosition = function (onlyMultiLineDiverges) {
+            this.state.verifySpanOfEnclosingComment(this.negative, onlyMultiLineDiverges);
+        };
+        VerifyNegatable.prototype.codeFix = function (options) {
+            this.state.verifyCodeFix(options);
+        };
+        VerifyNegatable.prototype.codeFixAvailable = function (options) {
+            this.state.verifyCodeFixAvailable(this.negative, options);
+        };
+        VerifyNegatable.prototype.applicableRefactorAvailableAtMarker = function (markerName) {
+            this.state.verifyApplicableRefactorAvailableAtMarker(this.negative, markerName);
+        };
+        VerifyNegatable.prototype.applicableRefactorAvailableForRange = function () {
+            this.state.verifyApplicableRefactorAvailableForRange(this.negative);
+        };
+        VerifyNegatable.prototype.refactor = function (options) {
+            this.state.verifyRefactor(options);
+        };
+        VerifyNegatable.prototype.refactorAvailable = function (name, actionName) {
+            this.state.verifyRefactorAvailable(this.negative, name, actionName);
+        };
+        return VerifyNegatable;
+    }());
+    FourSlashInterface.VerifyNegatable = VerifyNegatable;
+    var Verify = /** @class */ (function (_super) {
+        __extends(Verify, _super);
+        function Verify(state) {
+            return _super.call(this, state) || this;
+        }
+        Verify.prototype.completionsAt = function (markerName, completions, options) {
+            this.state.verifyCompletionsAt(markerName, completions, options);
+        };
+        Verify.prototype.completions = function () {
+            var optionsArray = [];
+            for (var _i = 0; _i < arguments.length; _i++) {
+                optionsArray[_i] = arguments[_i];
+            }
+            for (var _a = 0, optionsArray_1 = optionsArray; _a < optionsArray_1.length; _a++) {
+                var options = optionsArray_1[_a];
+                this.state.verifyCompletions(options);
+            }
+        };
+        Verify.prototype.quickInfoIs = function (expectedText, expectedDocumentation) {
+            this.state.verifyQuickInfoString(expectedText, expectedDocumentation);
+        };
+        Verify.prototype.quickInfoAt = function (markerName, expectedText, expectedDocumentation) {
+            this.state.verifyQuickInfoAt(markerName, expectedText, expectedDocumentation);
+        };
+        Verify.prototype.quickInfos = function (namesAndTexts) {
+            this.state.verifyQuickInfos(namesAndTexts);
+        };
+        Verify.prototype.caretAtMarker = function (markerName) {
+            this.state.verifyCaretAtMarker(markerName);
+        };
+        Verify.prototype.indentationIs = function (numberOfSpaces) {
+            this.state.verifyIndentationAtCurrentPosition(numberOfSpaces);
+        };
+        Verify.prototype.indentationAtPositionIs = function (fileName, position, numberOfSpaces, indentStyle, baseIndentSize) {
+            if (indentStyle === void 0) { indentStyle = ts.IndentStyle.Smart; }
+            if (baseIndentSize === void 0) { baseIndentSize = 0; }
+            this.state.verifyIndentationAtPosition(fileName, position, numberOfSpaces, indentStyle, baseIndentSize);
+        };
+        Verify.prototype.textAtCaretIs = function (text) {
+            this.state.verifyTextAtCaretIs(text);
+        };
+        /**
+         * Compiles the current file and evaluates 'expr' in a context containing
+         * the emitted output, then compares (using ===) the result of that expression
+         * to 'value'. Do not use this function with external modules as it is not supported.
+         */
+        Verify.prototype.eval = function (expr, value) {
+            this.state.verifyEval(expr, value);
+        };
+        Verify.prototype.currentLineContentIs = function (text) {
+            this.state.verifyCurrentLineContent(text);
+        };
+        Verify.prototype.currentFileContentIs = function (text) {
+            this.state.verifyCurrentFileContent(text);
+        };
+        Verify.prototype.goToDefinitionIs = function (endMarkers) {
+            this.state.verifyGoToDefinitionIs(endMarkers);
+        };
+        Verify.prototype.goToDefinition = function (arg0, endMarkerName) {
+            this.state.verifyGoToDefinition(arg0, endMarkerName);
+        };
+        Verify.prototype.goToType = function (arg0, endMarkerName) {
+            this.state.verifyGoToType(arg0, endMarkerName);
+        };
+        Verify.prototype.goToDefinitionForMarkers = function () {
+            var markerNames = [];
+            for (var _i = 0; _i < arguments.length; _i++) {
+                markerNames[_i] = arguments[_i];
+            }
+            this.state.verifyGoToDefinitionForMarkers(markerNames);
+        };
+        Verify.prototype.goToDefinitionName = function (name, containerName) {
+            this.state.verifyGoToDefinitionName(name, containerName);
+        };
+        Verify.prototype.verifyGetEmitOutputForCurrentFile = function (expected) {
+            this.state.verifyGetEmitOutputForCurrentFile(expected);
+        };
+        Verify.prototype.verifyGetEmitOutputContentsForCurrentFile = function (expected) {
+            this.state.verifyGetEmitOutputContentsForCurrentFile(expected);
+        };
+        Verify.prototype.symbolAtLocation = function (startRange) {
+            var declarationRanges = [];
+            for (var _i = 1; _i < arguments.length; _i++) {
+                declarationRanges[_i - 1] = arguments[_i];
+            }
+            this.state.verifySymbolAtLocation(startRange, declarationRanges);
+        };
+        Verify.prototype.typeOfSymbolAtLocation = function (range, symbol, expected) {
+            this.state.verifyTypeOfSymbolAtLocation(range, symbol, expected);
+        };
+        Verify.prototype.referenceGroups = function (starts, parts) {
+            this.state.verifyReferenceGroups(starts, parts);
+        };
+        Verify.prototype.noReferences = function (markerNameOrRange) {
+            this.state.verifyNoReferences(markerNameOrRange);
+        };
+        Verify.prototype.getReferencesForServerTest = function (expected) {
+            this.state.verifyGetReferencesForServerTest(expected);
+        };
+        Verify.prototype.singleReferenceGroup = function (definition, ranges) {
+            this.state.verifySingleReferenceGroup(definition, ranges);
+        };
+        Verify.prototype.findReferencesDefinitionDisplayPartsAtCaretAre = function (expected) {
+            this.state.verifyDisplayPartsOfReferencedSymbol(expected);
+        };
+        Verify.prototype.noErrors = function () {
+            this.state.verifyNoErrors();
+        };
+        Verify.prototype.numberOfErrorsInCurrentFile = function (expected) {
+            this.state.verifyNumberOfErrorsInCurrentFile(expected);
+        };
+        Verify.prototype.baselineCurrentFileBreakpointLocations = function () {
+            this.state.baselineCurrentFileBreakpointLocations();
+        };
+        Verify.prototype.baselineCurrentFileNameOrDottedNameSpans = function () {
+            this.state.baselineCurrentFileNameOrDottedNameSpans();
+        };
+        Verify.prototype.baselineGetEmitOutput = function (insertResultsIntoVfs) {
+            this.state.baselineGetEmitOutput(insertResultsIntoVfs);
+        };
+        Verify.prototype.baselineQuickInfo = function () {
+            this.state.baselineQuickInfo();
+        };
+        Verify.prototype.nameOrDottedNameSpanTextIs = function (text) {
+            this.state.verifyCurrentNameOrDottedNameSpanText(text);
+        };
+        Verify.prototype.outliningSpansInCurrentFile = function (spans, kind) {
+            this.state.verifyOutliningSpans(spans, kind);
+        };
+        Verify.prototype.todoCommentsInCurrentFile = function (descriptors) {
+            this.state.verifyTodoComments(descriptors, this.state.getRanges());
+        };
+        Verify.prototype.matchingBracePositionInCurrentFile = function (bracePosition, expectedMatchPosition) {
+            this.state.verifyMatchingBracePosition(bracePosition, expectedMatchPosition);
+        };
+        Verify.prototype.noMatchingBracePositionInCurrentFile = function (bracePosition) {
+            this.state.verifyNoMatchingBracePosition(bracePosition);
+        };
+        Verify.prototype.docCommentTemplateAt = function (marker, expectedOffset, expectedText) {
+            this.state.goToMarker(marker);
+            this.state.verifyDocCommentTemplate({ newText: expectedText.replace(/\r?\n/g, "\r\n"), caretOffset: expectedOffset });
+        };
+        Verify.prototype.noDocCommentTemplateAt = function (marker) {
+            this.state.goToMarker(marker);
+            this.state.verifyDocCommentTemplate(/*expected*/ undefined);
+        };
+        Verify.prototype.rangeAfterCodeFix = function (expectedText, includeWhiteSpace, errorCode, index) {
+            this.state.verifyRangeAfterCodeFix(expectedText, includeWhiteSpace, errorCode, index);
+        };
+        Verify.prototype.codeFixAll = function (options) {
+            this.state.verifyCodeFixAll(options);
+        };
+        Verify.prototype.fileAfterApplyingRefactorAtMarker = function (markerName, expectedContent, refactorNameToApply, actionName, formattingOptions) {
+            this.state.verifyFileAfterApplyingRefactorAtMarker(markerName, expectedContent, refactorNameToApply, actionName, formattingOptions);
+        };
+        Verify.prototype.rangeIs = function (expectedText, includeWhiteSpace) {
+            this.state.verifyRangeIs(expectedText, includeWhiteSpace);
+        };
+        Verify.prototype.getAndApplyCodeFix = function (errorCode, index) {
+            this.state.getAndApplyCodeActions(errorCode, index);
+        };
+        Verify.prototype.applyCodeActionFromCompletion = function (markerName, options) {
+            this.state.applyCodeActionFromCompletion(markerName, options);
+        };
+        Verify.prototype.importFixAtPosition = function (expectedTextArray, errorCode, preferences) {
+            this.state.verifyImportFixAtPosition(expectedTextArray, errorCode, preferences);
+        };
+        Verify.prototype.navigationBar = function (json, options) {
+            this.state.verifyNavigationBar(json, options);
+        };
+        Verify.prototype.navigationTree = function (json, options) {
+            this.state.verifyNavigationTree(json, options);
+        };
+        Verify.prototype.navigationItemsListCount = function (count, searchValue, matchKind, fileName) {
+            this.state.verifyNavigationItemsCount(count, searchValue, matchKind, fileName);
+        };
+        Verify.prototype.navigationItemsListContains = function (name, kind, searchValue, matchKind, fileName, parentName) {
+            this.state.verifyNavigationItemsListContains(name, kind, searchValue, matchKind, fileName, parentName);
+        };
+        Verify.prototype.occurrencesAtPositionContains = function (range, isWriteAccess) {
+            this.state.verifyOccurrencesAtPositionListContains(range.fileName, range.pos, range.end, isWriteAccess);
+        };
+        Verify.prototype.occurrencesAtPositionCount = function (expectedCount) {
+            this.state.verifyOccurrencesAtPositionListCount(expectedCount);
+        };
+        Verify.prototype.rangesAreOccurrences = function (isWriteAccess) {
+            this.state.verifyRangesAreOccurrences(isWriteAccess);
+        };
+        Verify.prototype.rangesWithSameTextAreRenameLocations = function () {
+            this.state.verifyRangesWithSameTextAreRenameLocations();
+        };
+        Verify.prototype.rangesAreRenameLocations = function (options) {
+            this.state.verifyRangesAreRenameLocations(options);
+        };
+        Verify.prototype.rangesAreDocumentHighlights = function (ranges, options) {
+            this.state.verifyRangesAreDocumentHighlights(ranges, options);
+        };
+        Verify.prototype.rangesWithSameTextAreDocumentHighlights = function () {
+            this.state.verifyRangesWithSameTextAreDocumentHighlights();
+        };
+        Verify.prototype.documentHighlightsOf = function (startRange, ranges, options) {
+            this.state.verifyDocumentHighlightsOf(startRange, ranges, options);
+        };
+        Verify.prototype.noDocumentHighlights = function (startRange) {
+            this.state.verifyNoDocumentHighlights(startRange);
+        };
+        Verify.prototype.completionEntryDetailIs = function (entryName, text, documentation, kind, tags) {
+            this.state.verifyCompletionEntryDetails(entryName, text, documentation, kind, tags);
+        };
+        /**
+         * This method *requires* a contiguous, complete, and ordered stream of classifications for a file.
+         */
+        Verify.prototype.syntacticClassificationsAre = function () {
+            var classifications = [];
+            for (var _i = 0; _i < arguments.length; _i++) {
+                classifications[_i] = arguments[_i];
+            }
+            this.state.verifySyntacticClassifications(classifications);
+        };
+        /**
+         * This method *requires* an ordered stream of classifications for a file, and spans are highly recommended.
+         */
+        Verify.prototype.semanticClassificationsAre = function () {
+            var classifications = [];
+            for (var _i = 0; _i < arguments.length; _i++) {
+                classifications[_i] = arguments[_i];
+            }
+            this.state.verifySemanticClassifications(classifications);
+        };
+        Verify.prototype.renameInfoSucceeded = function (displayName, fullDisplayName, kind, kindModifiers) {
+            this.state.verifyRenameInfoSucceeded(displayName, fullDisplayName, kind, kindModifiers);
+        };
+        Verify.prototype.renameInfoFailed = function (message) {
+            this.state.verifyRenameInfoFailed(message);
+        };
+        Verify.prototype.renameLocations = function (startRanges, options) {
+            this.state.verifyRenameLocations(startRanges, options);
+        };
+        Verify.prototype.verifyQuickInfoDisplayParts = function (kind, kindModifiers, textSpan, displayParts, documentation, tags) {
+            this.state.verifyQuickInfoDisplayParts(kind, kindModifiers, textSpan, displayParts, documentation, tags);
+        };
+        Verify.prototype.getSyntacticDiagnostics = function (expected) {
+            this.state.getSyntacticDiagnostics(expected);
+        };
+        Verify.prototype.getSemanticDiagnostics = function (expected) {
+            this.state.getSemanticDiagnostics(expected);
+        };
+        Verify.prototype.getSuggestionDiagnostics = function (expected) {
+            this.state.getSuggestionDiagnostics(expected);
+        };
+        Verify.prototype.ProjectInfo = function (expected) {
+            this.state.verifyProjectInfo(expected);
+        };
+        Verify.prototype.allRangesAppearInImplementationList = function (markerName) {
+            this.state.verifyRangesInImplementationList(markerName);
+        };
+        Verify.prototype.getEditsForFileRename = function (options) {
+            this.state.getEditsForFileRename(options);
+        };
+        Verify.prototype.moveToNewFile = function (options) {
+            this.state.moveToNewFile(options);
+        };
+        Verify.prototype.noMoveToNewFile = function () {
+            this.state.noMoveToNewFile();
+        };
+        return Verify;
+    }(VerifyNegatable));
+    FourSlashInterface.Verify = Verify;
+    var Edit = /** @class */ (function () {
+        function Edit(state) {
+            this.state = state;
+        }
+        Edit.prototype.backspace = function (count) {
+            this.state.deleteCharBehindMarker(count);
+        };
+        Edit.prototype.deleteAtCaret = function (times) {
+            this.state.deleteChar(times);
+        };
+        Edit.prototype.replace = function (start, length, text) {
+            this.state.replace(start, length, text);
+        };
+        Edit.prototype.paste = function (text) {
+            this.state.paste(text);
+        };
+        Edit.prototype.insert = function (text) {
+            this.insertLines(text);
+        };
+        Edit.prototype.insertLine = function (text) {
+            this.insertLines(text + "\n");
+        };
+        Edit.prototype.insertLines = function () {
+            var lines = [];
+            for (var _i = 0; _i < arguments.length; _i++) {
+                lines[_i] = arguments[_i];
+            }
+            this.state.type(lines.join("\n"));
+        };
+        Edit.prototype.moveRight = function (count) {
+            this.state.moveCaretRight(count);
+        };
+        Edit.prototype.moveLeft = function (count) {
+            if (typeof count === "undefined") {
+                count = 1;
+            }
+            this.state.moveCaretRight(count * -1);
+        };
+        Edit.prototype.enableFormatting = function () {
+            this.state.enableFormatting = true;
+        };
+        Edit.prototype.disableFormatting = function () {
+            this.state.enableFormatting = false;
+        };
+        Edit.prototype.applyRefactor = function (options) {
+            this.state.applyRefactor(options);
+        };
+        return Edit;
+    }());
+    FourSlashInterface.Edit = Edit;
+    var Debug = /** @class */ (function () {
+        function Debug(state) {
+            this.state = state;
+        }
+        Debug.prototype.printCurrentParameterHelp = function () {
+            this.state.printCurrentParameterHelp();
+        };
+        Debug.prototype.printCurrentFileState = function () {
+            this.state.printCurrentFileState(/*showWhitespace*/ false, /*makeCaretVisible*/ true);
+        };
+        Debug.prototype.printCurrentFileStateWithWhitespace = function () {
+            this.state.printCurrentFileState(/*showWhitespace*/ true, /*makeCaretVisible*/ true);
+        };
+        Debug.prototype.printCurrentFileStateWithoutCaret = function () {
+            this.state.printCurrentFileState(/*showWhitespace*/ false, /*makeCaretVisible*/ false);
+        };
+        Debug.prototype.printCurrentQuickInfo = function () {
+            this.state.printCurrentQuickInfo();
+        };
+        Debug.prototype.printCurrentSignatureHelp = function () {
+            this.state.printCurrentSignatureHelp();
+        };
+        Debug.prototype.printCompletionListMembers = function (options) {
+            this.state.printCompletionListMembers(options);
+        };
+        Debug.prototype.printAvailableCodeFixes = function () {
+            this.state.printAvailableCodeFixes();
+        };
+        Debug.prototype.printBreakpointLocation = function (pos) {
+            this.state.printBreakpointLocation(pos);
+        };
+        Debug.prototype.printBreakpointAtCurrentLocation = function () {
+            this.state.printBreakpointAtCurrentLocation();
+        };
+        Debug.prototype.printNameOrDottedNameSpans = function (pos) {
+            this.state.printNameOrDottedNameSpans(pos);
+        };
+        Debug.prototype.printErrorList = function () {
+            this.state.printErrorList();
+        };
+        Debug.prototype.printNavigationItems = function (searchValue) {
+            if (searchValue === void 0) { searchValue = ".*"; }
+            this.state.printNavigationItems(searchValue);
+        };
+        Debug.prototype.printNavigationBar = function () {
+            this.state.printNavigationBar();
+        };
+        Debug.prototype.printContext = function () {
+            this.state.printContext();
+        };
+        Debug.prototype.printOutliningSpans = function () {
+            this.state.printOutliningSpans();
+        };
+        return Debug;
+    }());
+    FourSlashInterface.Debug = Debug;
+    var Format = /** @class */ (function () {
+        function Format(state) {
+            this.state = state;
+        }
+        Format.prototype.document = function () {
+            this.state.formatDocument();
+        };
+        Format.prototype.copyFormatOptions = function () {
+            return this.state.copyFormatOptions();
+        };
+        Format.prototype.setFormatOptions = function (options) {
+            return this.state.setFormatOptions(options);
+        };
+        Format.prototype.selection = function (startMarker, endMarker) {
+            this.state.formatSelection(this.state.getMarkerByName(startMarker).position, this.state.getMarkerByName(endMarker).position);
+        };
+        Format.prototype.onType = function (posMarker, key) {
+            this.state.formatOnType(this.state.getMarkerByName(posMarker).position, key);
+        };
+        Format.prototype.setOption = function (name, value) {
+            this.state.formatCodeSettings[name] = value;
+        };
+        return Format;
+    }());
+    FourSlashInterface.Format = Format;
+    var Cancellation = /** @class */ (function () {
+        function Cancellation(state) {
+            this.state = state;
+        }
+        Cancellation.prototype.resetCancelled = function () {
+            this.state.resetCancelled();
+        };
+        Cancellation.prototype.setCancelled = function (numberOfCalls) {
+            if (numberOfCalls === void 0) { numberOfCalls = 0; }
+            this.state.setCancelled(numberOfCalls);
+        };
+        return Cancellation;
+    }());
+    FourSlashInterface.Cancellation = Cancellation;
+    var Classification;
+    (function (Classification) {
+        function comment(text, position) {
+            return getClassification("comment" /* comment */, text, position);
+        }
+        Classification.comment = comment;
+        function identifier(text, position) {
+            return getClassification("identifier" /* identifier */, text, position);
+        }
+        Classification.identifier = identifier;
+        function keyword(text, position) {
+            return getClassification("keyword" /* keyword */, text, position);
+        }
+        Classification.keyword = keyword;
+        function numericLiteral(text, position) {
+            return getClassification("number" /* numericLiteral */, text, position);
+        }
+        Classification.numericLiteral = numericLiteral;
+        function operator(text, position) {
+            return getClassification("operator" /* operator */, text, position);
+        }
+        Classification.operator = operator;
+        function stringLiteral(text, position) {
+            return getClassification("string" /* stringLiteral */, text, position);
+        }
+        Classification.stringLiteral = stringLiteral;
+        function whiteSpace(text, position) {
+            return getClassification("whitespace" /* whiteSpace */, text, position);
+        }
+        Classification.whiteSpace = whiteSpace;
+        function text(text, position) {
+            return getClassification("text" /* text */, text, position);
+        }
+        Classification.text = text;
+        function punctuation(text, position) {
+            return getClassification("punctuation" /* punctuation */, text, position);
+        }
+        Classification.punctuation = punctuation;
+        function docCommentTagName(text, position) {
+            return getClassification("doc comment tag name" /* docCommentTagName */, text, position);
+        }
+        Classification.docCommentTagName = docCommentTagName;
+        function className(text, position) {
+            return getClassification("class name" /* className */, text, position);
+        }
+        Classification.className = className;
+        function enumName(text, position) {
+            return getClassification("enum name" /* enumName */, text, position);
+        }
+        Classification.enumName = enumName;
+        function interfaceName(text, position) {
+            return getClassification("interface name" /* interfaceName */, text, position);
+        }
+        Classification.interfaceName = interfaceName;
+        function moduleName(text, position) {
+            return getClassification("module name" /* moduleName */, text, position);
+        }
+        Classification.moduleName = moduleName;
+        function typeParameterName(text, position) {
+            return getClassification("type parameter name" /* typeParameterName */, text, position);
+        }
+        Classification.typeParameterName = typeParameterName;
+        function parameterName(text, position) {
+            return getClassification("parameter name" /* parameterName */, text, position);
+        }
+        Classification.parameterName = parameterName;
+        function typeAliasName(text, position) {
+            return getClassification("type alias name" /* typeAliasName */, text, position);
+        }
+        Classification.typeAliasName = typeAliasName;
+        function jsxOpenTagName(text, position) {
+            return getClassification("jsx open tag name" /* jsxOpenTagName */, text, position);
+        }
+        Classification.jsxOpenTagName = jsxOpenTagName;
+        function jsxCloseTagName(text, position) {
+            return getClassification("jsx close tag name" /* jsxCloseTagName */, text, position);
+        }
+        Classification.jsxCloseTagName = jsxCloseTagName;
+        function jsxSelfClosingTagName(text, position) {
+            return getClassification("jsx self closing tag name" /* jsxSelfClosingTagName */, text, position);
+        }
+        Classification.jsxSelfClosingTagName = jsxSelfClosingTagName;
+        function jsxAttribute(text, position) {
+            return getClassification("jsx attribute" /* jsxAttribute */, text, position);
+        }
+        Classification.jsxAttribute = jsxAttribute;
+        function jsxText(text, position) {
+            return getClassification("jsx text" /* jsxText */, text, position);
+        }
+        Classification.jsxText = jsxText;
+        function jsxAttributeStringLiteralValue(text, position) {
+            return getClassification("jsx attribute string literal value" /* jsxAttributeStringLiteralValue */, text, position);
+        }
+        Classification.jsxAttributeStringLiteralValue = jsxAttributeStringLiteralValue;
+        function getClassification(classificationType, text, position) {
+            var textSpan = position === undefined ? undefined : { start: position, end: position + text.length };
+            return { classificationType: classificationType, text: text, textSpan: textSpan };
+        }
+    })(Classification = FourSlashInterface.Classification || (FourSlashInterface.Classification = {}));
+})(FourSlashInterface || (FourSlashInterface = {}));
+var TypeWriterWalker = /** @class */ (function () {
+    function TypeWriterWalker(program, fullTypeCheck) {
+        this.program = program;
+        // Consider getting both the diagnostics checker and the non-diagnostics checker to verify
+        // they are consistent.
+        this.checker = fullTypeCheck
+            ? program.getDiagnosticsProducingTypeChecker()
+            : program.getTypeChecker();
+    }
+    TypeWriterWalker.prototype.getSymbols = function (fileName) {
+        var _a, sourceFile, gen, _b, done, value;
+        return __generator(this, function (_c) {
+            switch (_c.label) {
+                case 0:
+                    sourceFile = this.program.getSourceFile(fileName);
+                    this.currentSourceFile = sourceFile;
+                    gen = this.visitNode(sourceFile, /*isSymbolWalk*/ true);
+                    _b = gen.next(), done = _b.done, value = _b.value;
+                    _c.label = 1;
+                case 1:
+                    if (!!done) return [3 /*break*/, 4];
+                    return [4 /*yield*/, value];
+                case 2:
+                    _c.sent();
+                    _c.label = 3;
+                case 3:
+                    _a = gen.next(), done = _a.done, value = _a.value, _a;
+                    return [3 /*break*/, 1];
+                case 4: return [2 /*return*/];
+            }
+        });
+    };
+    TypeWriterWalker.prototype.getTypes = function (fileName) {
+        var _a, sourceFile, gen, _b, done, value;
+        return __generator(this, function (_c) {
+            switch (_c.label) {
+                case 0:
+                    sourceFile = this.program.getSourceFile(fileName);
+                    this.currentSourceFile = sourceFile;
+                    gen = this.visitNode(sourceFile, /*isSymbolWalk*/ false);
+                    _b = gen.next(), done = _b.done, value = _b.value;
+                    _c.label = 1;
+                case 1:
+                    if (!!done) return [3 /*break*/, 4];
+                    return [4 /*yield*/, value];
+                case 2:
+                    _c.sent();
+                    _c.label = 3;
+                case 3:
+                    _a = gen.next(), done = _a.done, value = _a.value, _a;
+                    return [3 /*break*/, 1];
+                case 4: return [2 /*return*/];
+            }
+        });
+    };
+    TypeWriterWalker.prototype.visitNode = function (node, isSymbolWalk) {
+        var _a, result, children, _i, children_1, child, gen, _b, done, value;
+        return __generator(this, function (_c) {
+            switch (_c.label) {
+                case 0:
+                    if (!(ts.isExpressionNode(node) || node.kind === 71 /* Identifier */ || ts.isDeclarationName(node))) return [3 /*break*/, 2];
+                    result = this.writeTypeOrSymbol(node, isSymbolWalk);
+                    if (!result) return [3 /*break*/, 2];
+                    return [4 /*yield*/, result];
+                case 1:
+                    _c.sent();
+                    _c.label = 2;
+                case 2:
+                    children = [];
+                    ts.forEachChild(node, function (child) { return void children.push(child); });
+                    _i = 0, children_1 = children;
+                    _c.label = 3;
+                case 3:
+                    if (!(_i < children_1.length)) return [3 /*break*/, 8];
+                    child = children_1[_i];
+                    gen = this.visitNode(child, isSymbolWalk);
+                    _b = gen.next(), done = _b.done, value = _b.value;
+                    _c.label = 4;
+                case 4:
+                    if (!!done) return [3 /*break*/, 7];
+                    return [4 /*yield*/, value];
+                case 5:
+                    _c.sent();
+                    _c.label = 6;
+                case 6:
+                    _a = gen.next(), done = _a.done, value = _a.value, _a;
+                    return [3 /*break*/, 4];
+                case 7:
+                    _i++;
+                    return [3 /*break*/, 3];
+                case 8: return [2 /*return*/];
+            }
+        });
+    };
+    TypeWriterWalker.prototype.writeTypeOrSymbol = function (node, isSymbolWalk) {
+        var actualPos = ts.skipTrivia(this.currentSourceFile.text, node.pos);
+        var lineAndCharacter = this.currentSourceFile.getLineAndCharacterOfPosition(actualPos);
+        var sourceText = ts.getSourceTextOfNodeFromSourceFile(this.currentSourceFile, node);
+        if (!isSymbolWalk) {
+            // Workaround to ensure we output 'C' instead of 'typeof C' for base class expressions
+            // let type = this.checker.getTypeAtLocation(node);
+            var type = node.parent && ts.isExpressionWithTypeArgumentsInClassExtendsClause(node.parent) && this.checker.getTypeAtLocation(node.parent) || this.checker.getTypeAtLocation(node);
+            var typeString = type ? this.checker.typeToString(type, node.parent, 1 /* NoTruncation */ | 1048576 /* AllowUniqueESSymbolType */) : "No type information available!";
+            return {
+                line: lineAndCharacter.line,
+                syntaxKind: node.kind,
+                sourceText: sourceText,
+                type: typeString
+            };
+        }
+        var symbol = this.checker.getSymbolAtLocation(node);
+        if (!symbol) {
+            return;
+        }
+        var symbolString = "Symbol(" + this.checker.symbolToString(symbol, node.parent);
+        if (symbol.declarations) {
+            var count = 0;
+            for (var _i = 0, _a = symbol.declarations; _i < _a.length; _i++) {
+                var declaration = _a[_i];
+                if (count >= 5) {
+                    symbolString += " ... and " + (symbol.declarations.length - count) + " more";
+                    break;
+                }
+                count++;
+                symbolString += ", ";
+                if (declaration.__symbolTestOutputCache) {
+                    symbolString += declaration.__symbolTestOutputCache;
+                    continue;
+                }
+                var declSourceFile = declaration.getSourceFile();
+                var declLineAndCharacter = declSourceFile.getLineAndCharacterOfPosition(declaration.pos);
+                var fileName = ts.getBaseFileName(declSourceFile.fileName);
+                var isLibFile = /lib(.*)\.d\.ts/i.test(fileName);
+                var declText = "Decl(" + fileName + ", " + (isLibFile ? "--" : declLineAndCharacter.line) + ", " + (isLibFile ? "--" : declLineAndCharacter.character) + ")";
+                symbolString += declText;
+                declaration.__symbolTestOutputCache = declText;
+            }
+        }
+        symbolString += ")";
+        return {
+            line: lineAndCharacter.line,
+            syntaxKind: node.kind,
+            sourceText: sourceText,
+            symbol: symbolString
+        };
+    };
+    return TypeWriterWalker;
+}());
+var Playback;
+(function (Playback) {
+    var recordLog;
+    var replayLog;
+    var replayFilesRead;
+    var recordLogFileNameBase = "";
+    function memoize(func) {
+        var lookup = {};
+        var run = (function (s) {
+            if (lookup.hasOwnProperty(s))
+                return lookup[s];
+            return lookup[s] = func(s);
+        });
+        run.reset = function () {
+            lookup = undefined; // TODO: GH#18217
+        };
+        return run;
+    }
+    function createEmptyLog() {
+        return {
+            timestamp: (new Date()).toString(),
+            arguments: [],
+            currentDirectory: "",
+            filesRead: [],
+            directoriesRead: [],
+            filesWritten: [],
+            filesDeleted: [],
+            filesAppended: [],
+            fileExists: [],
+            filesFound: [],
+            dirs: [],
+            dirExists: [],
+            dirsCreated: [],
+            pathsResolved: [],
+            executingPath: ""
+        };
+    }
+    function newStyleLogIntoOldStyleLog(log, host, baseName) {
+        for (var _i = 0, _a = log.filesAppended; _i < _a.length; _i++) {
+            var file = _a[_i];
+            if (file.contentsPath) {
+                file.contents = host.readFile(ts.combinePaths(baseName, file.contentsPath));
+                delete file.contentsPath;
+            }
+        }
+        for (var _b = 0, _c = log.filesWritten; _b < _c.length; _b++) {
+            var file = _c[_b];
+            if (file.contentsPath) {
+                file.contents = host.readFile(ts.combinePaths(baseName, file.contentsPath));
+                delete file.contentsPath;
+            }
+        }
+        for (var _d = 0, _e = log.filesRead; _d < _e.length; _d++) {
+            var file = _e[_d];
+            var result = file.result; // TODO: GH#18217
+            if (result.contentsPath) {
+                // `readFile` strips away a BOM (and actually reinerprets the file contents according to the correct encoding)
+                // - but this has the unfortunate sideeffect of removing the BOM from any outputs based on the file, so we readd it here.
+                result.contents = (result.bom || "") + host.readFile(ts.combinePaths(baseName, result.contentsPath));
+                delete result.contentsPath;
+            }
+        }
+        return log;
+    }
+    Playback.newStyleLogIntoOldStyleLog = newStyleLogIntoOldStyleLog;
+    var canonicalizeForHarness = ts.createGetCanonicalFileName(/*caseSensitive*/ false); // This is done so tests work on windows _and_ linux
+    function sanitizeTestFilePath(name) {
+        var path = ts.toPath(ts.normalizeSlashes(name.replace(/[\^<>:"|?*%]/g, "_")).replace(/\.\.\//g, "__dotdot/"), "", canonicalizeForHarness);
+        if (ts.startsWith(path, "/")) {
+            return path.substring(1);
+        }
+        return path;
+    }
+    function oldStyleLogIntoNewStyleLog(log, writeFile, baseTestName) {
+        if (log.filesAppended) {
+            for (var _i = 0, _a = log.filesAppended; _i < _a.length; _i++) {
+                var file = _a[_i];
+                if (file.contents !== undefined) {
+                    file.contentsPath = ts.combinePaths("appended", sanitizeTestFilePath(file.path));
+                    writeFile(ts.combinePaths(baseTestName, file.contentsPath), file.contents);
+                    delete file.contents;
+                }
+            }
+        }
+        if (log.filesWritten) {
+            for (var _b = 0, _c = log.filesWritten; _b < _c.length; _b++) {
+                var file = _c[_b];
+                if (file.contents !== undefined) {
+                    file.contentsPath = ts.combinePaths("written", sanitizeTestFilePath(file.path));
+                    writeFile(ts.combinePaths(baseTestName, file.contentsPath), file.contents);
+                    delete file.contents;
+                }
+            }
+        }
+        if (log.filesRead) {
+            for (var _d = 0, _e = log.filesRead; _d < _e.length; _d++) {
+                var file = _e[_d];
+                var result = file.result; // TODO: GH#18217
+                var contents = result.contents;
+                if (contents !== undefined) {
+                    result.contentsPath = ts.combinePaths("read", sanitizeTestFilePath(file.path));
+                    writeFile(ts.combinePaths(baseTestName, result.contentsPath), contents);
+                    var len = contents.length;
+                    if (len >= 2 && contents.charCodeAt(0) === 0xfeff) {
+                        result.bom = "\ufeff";
+                    }
+                    if (len >= 2 && contents.charCodeAt(0) === 0xfffe) {
+                        result.bom = "\ufffe";
+                    }
+                    if (len >= 3 && contents.charCodeAt(0) === 0xefbb && contents.charCodeAt(1) === 0xbf) {
+                        result.bom = "\uefbb\xbf";
+                    }
+                    delete result.contents;
+                }
+            }
+        }
+        return log;
+    }
+    Playback.oldStyleLogIntoNewStyleLog = oldStyleLogIntoNewStyleLog;
+    function initWrapper(wrapper, underlying) {
+        ts.forEach(Object.keys(underlying), function (prop) {
+            wrapper[prop] = underlying[prop];
+        });
+        wrapper.startReplayFromString = function (logString) {
+            wrapper.startReplayFromData(JSON.parse(logString));
+        };
+        wrapper.startReplayFromData = function (log) {
+            replayLog = log;
+            // Remove non-found files from the log (shouldn't really need them, but we still record them for diagnostic purposes)
+            replayLog.filesRead = replayLog.filesRead.filter(function (f) { return f.result.contents !== undefined; });
+            replayFilesRead = ts.createMap();
+            for (var _i = 0, _a = replayLog.filesRead; _i < _a.length; _i++) {
+                var file = _a[_i];
+                replayFilesRead.set(ts.normalizeSlashes(file.path).toLowerCase(), file);
+            }
+        };
+        wrapper.endReplay = function () {
+            replayLog = undefined;
+            replayFilesRead = undefined;
+        };
+        wrapper.startRecord = function (fileNameBase) {
+            recordLogFileNameBase = fileNameBase;
+            recordLog = createEmptyLog();
+            recordLog.useCaseSensitiveFileNames = typeof underlying.useCaseSensitiveFileNames === "function" ? underlying.useCaseSensitiveFileNames() : underlying.useCaseSensitiveFileNames;
+            if (typeof underlying.args !== "function") {
+                recordLog.arguments = underlying.args;
+            }
+        };
+        wrapper.startReplayFromFile = function (logFn) {
+            wrapper.startReplayFromString(underlying.readFile(logFn));
+        };
+        wrapper.endRecord = function () {
+            if (recordLog !== undefined) {
+                var i_1 = 0;
+                var getBase = function () { return recordLogFileNameBase + i_1; };
+                while (underlying.fileExists(ts.combinePaths(getBase(), "test.json")))
+                    i_1++;
+                var newLog = oldStyleLogIntoNewStyleLog(recordLog, function (path, str) { return underlying.writeFile(path, str); }, getBase());
+                underlying.writeFile(ts.combinePaths(getBase(), "test.json"), JSON.stringify(newLog, null, 4)); // tslint:disable-line:no-null-keyword
+                var syntheticTsconfig = generateTsconfig(newLog);
+                if (syntheticTsconfig) {
+                    underlying.writeFile(ts.combinePaths(getBase(), "tsconfig.json"), JSON.stringify(syntheticTsconfig, null, 4)); // tslint:disable-line:no-null-keyword
+                }
+                recordLog = undefined;
+            }
+        };
+        function generateTsconfig(newLog) {
+            if (newLog.filesRead.some(function (file) { return /tsconfig.+json$/.test(file.path); })) {
+                return;
+            }
+            var files = [];
+            for (var _i = 0, _a = newLog.filesRead; _i < _a.length; _i++) {
+                var file = _a[_i];
+                var result = file.result;
+                if (result.contentsPath &&
+                    Harness.isDefaultLibraryFile(result.contentsPath) &&
+                    /\.[tj]s$/.test(result.contentsPath)) {
+                    files.push(result.contentsPath);
+                }
+            }
+            return { compilerOptions: ts.parseCommandLine(newLog.arguments).options, files: files };
+        }
+        wrapper.fileExists = recordReplay(wrapper.fileExists, underlying)(function (path) { return callAndRecord(underlying.fileExists(path), recordLog.fileExists, { path: path }); }, memoize(function (path) {
+            // If we read from the file, it must exist
+            if (findFileByPath(path, /*throwFileNotFoundError*/ false)) {
+                return true;
+            }
+            else {
+                return findResultByFields(replayLog.fileExists, { path: path }, /*defaultValue*/ false);
+            }
+        }));
+        wrapper.getExecutingFilePath = function () {
+            if (replayLog !== undefined) {
+                return replayLog.executingPath;
+            }
+            else if (recordLog !== undefined) {
+                return recordLog.executingPath = underlying.getExecutingFilePath();
+            }
+            else {
+                return underlying.getExecutingFilePath();
+            }
+        };
+        wrapper.getCurrentDirectory = function () {
+            if (replayLog !== undefined) {
+                return replayLog.currentDirectory || "";
+            }
+            else if (recordLog !== undefined) {
+                return recordLog.currentDirectory = underlying.getCurrentDirectory();
+            }
+            else {
+                return underlying.getCurrentDirectory();
+            }
+        };
+        wrapper.resolvePath = recordReplay(wrapper.resolvePath, underlying)(function (path) { return callAndRecord(underlying.resolvePath(path), recordLog.pathsResolved, { path: path }); }, memoize(function (path) { return findResultByFields(replayLog.pathsResolved, { path: path }, !ts.isRootedDiskPath(ts.normalizeSlashes(path)) && replayLog.currentDirectory ? replayLog.currentDirectory + "/" + path : ts.normalizeSlashes(path)); }));
+        wrapper.readFile = recordReplay(wrapper.readFile, underlying)(function (path) {
+            var result = underlying.readFile(path);
+            var logEntry = { path: path, codepage: 0, result: { contents: result, codepage: 0 } };
+            recordLog.filesRead.push(logEntry);
+            return result;
+        }, memoize(function (path) { return findFileByPath(path, /*throwFileNotFoundError*/ true).contents; }));
+        wrapper.readDirectory = recordReplay(wrapper.readDirectory, underlying)(function (path, extensions, exclude, include, depth) {
+            var result = underlying.readDirectory(path, extensions, exclude, include, depth);
+            recordLog.directoriesRead.push({ path: path, extensions: extensions, exclude: exclude, include: include, depth: depth, result: result });
+            return result;
+        }, function (path) {
+            // Because extensions is an array of all allowed extension, we will want to merge each of the replayLog.directoriesRead into one
+            // if each of the directoriesRead has matched path with the given path (directory with same path but different extension will considered
+            // different entry).
+            // TODO (yuisu): We can certainly remove these once we recapture the RWC using new API
+            var normalizedPath = ts.normalizePath(path).toLowerCase();
+            return ts.flatMap(replayLog.directoriesRead, function (directory) {
+                if (ts.normalizeSlashes(directory.path).toLowerCase() === normalizedPath) {
+                    return directory.result;
+                }
+            });
+        });
+        wrapper.writeFile = recordReplay(wrapper.writeFile, underlying)(function (path, contents) { return callAndRecord(underlying.writeFile(path, contents), recordLog.filesWritten, { path: path, contents: contents, bom: false }); }, function () { return noOpReplay("writeFile"); });
+        wrapper.exit = function (exitCode) {
+            if (recordLog !== undefined) {
+                wrapper.endRecord();
+            }
+            underlying.exit(exitCode);
+        };
+        wrapper.useCaseSensitiveFileNames = function () {
+            if (replayLog !== undefined) {
+                return !!replayLog.useCaseSensitiveFileNames;
+            }
+            return typeof underlying.useCaseSensitiveFileNames === "function" ? underlying.useCaseSensitiveFileNames() : underlying.useCaseSensitiveFileNames;
+        };
+    }
+    function recordReplay(original, underlying) {
+        function createWrapper(record, replay) {
+            // tslint:disable-next-line only-arrow-functions
+            return (function () {
+                if (replayLog !== undefined) {
+                    return replay.apply(undefined, arguments);
+                }
+                else if (recordLog !== undefined) {
+                    return record.apply(undefined, arguments);
+                }
+                else {
+                    return original.apply(underlying, arguments);
+                }
+            });
+        }
+        return createWrapper;
+    }
+    function callAndRecord(underlyingResult, logArray, logEntry) {
+        if (underlyingResult !== undefined) {
+            logEntry.result = underlyingResult;
+        }
+        logArray.push(logEntry);
+        return underlyingResult;
+    }
+    function findResultByFields(logArray, expectedFields, defaultValue) {
+        var predicate = function (entry) {
+            return Object.getOwnPropertyNames(expectedFields).every(function (name) { return entry[name] === expectedFields[name]; });
+        };
+        var results = logArray.filter(function (entry) { return predicate(entry); });
+        if (results.length === 0) {
+            if (defaultValue !== undefined) {
+                return defaultValue;
+            }
+            else {
+                throw new Error("No matching result in log array for: " + JSON.stringify(expectedFields));
+            }
+        }
+        return results[0].result;
+    }
+    function findFileByPath(expectedPath, throwFileNotFoundError) {
+        var normalizedName = ts.normalizePath(expectedPath).toLowerCase();
+        // Try to find the result through normal fileName
+        var result = replayFilesRead.get(normalizedName);
+        if (result) {
+            return result.result;
+        }
+        // If we got here, we didn't find a match
+        if (throwFileNotFoundError) {
+            throw new Error("No matching result in log array for path: " + expectedPath);
+        }
+        else {
+            return undefined;
+        }
+    }
+    function noOpReplay(_name) {
+        // console.log("Swallowed write operation during replay: " + name);
+    }
+    function wrapIO(underlying) {
+        var wrapper = {};
+        initWrapper(wrapper, underlying);
+        wrapper.directoryName = notSupported;
+        wrapper.createDirectory = notSupported;
+        wrapper.directoryExists = notSupported;
+        wrapper.deleteFile = notSupported;
+        wrapper.listFiles = notSupported;
+        return wrapper;
+        function notSupported() {
+            throw new Error("NotSupported");
+        }
+    }
+    Playback.wrapIO = wrapIO;
+    function wrapSystem(underlying) {
+        var wrapper = {};
+        initWrapper(wrapper, underlying);
+        return wrapper;
+    }
+    Playback.wrapSystem = wrapSystem;
+})(Playback || (Playback = {}));
+//# sourceMappingURL=harness.js.map
\ No newline at end of file
diff --git a/src/built/local/harness.js.map b/src/built/local/harness.js.map
new file mode 100644
index 00000000000..8bae7bf1b91
--- /dev/null
+++ b/src/built/local/harness.js.map
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/src/server/cancellationToken/cancellationToken.ts b/src/cancellationToken/cancellationToken.ts
similarity index 100%
rename from src/server/cancellationToken/cancellationToken.ts
rename to src/cancellationToken/cancellationToken.ts
diff --git a/src/server/cancellationToken/tsconfig.json b/src/cancellationToken/tsconfig.json
similarity index 62%
rename from src/server/cancellationToken/tsconfig.json
rename to src/cancellationToken/tsconfig.json
index 604b92b4cf2..45795320796 100644
--- a/src/server/cancellationToken/tsconfig.json
+++ b/src/cancellationToken/tsconfig.json
@@ -1,6 +1,9 @@
 {
-    "extends": "../../tsconfig-base",
+    "extends": "../tsconfig-base",
     "compilerOptions": {
+        "outDir": "../built/local/",
+        "composite": false,
+        "declaration": false,
         "removeComments": true,
         "module": "commonjs",
         "types": [
diff --git a/src/compiler/resolutionCache.ts b/src/compiler/resolutionCache.ts
index 3f848cfbc29..4614c3bede4 100644
--- a/src/compiler/resolutionCache.ts
+++ b/src/compiler/resolutionCache.ts
@@ -6,7 +6,7 @@ namespace ts {
         finishRecordingFilesWithChangedResolutions(): Path[] | undefined;
 
         resolveModuleNames(moduleNames: string[], containingFile: string, reusedNames: string[] | undefined): ResolvedModuleFull[];
-        getResolvedModuleWithFailedLookupLocationsFromCache(moduleName: string, containingFile: string): ResolvedModuleWithFailedLookupLocations | undefined;
+        getResolvedModuleWithFailedLookupLocationsFromCache(moduleName: string, containingFile: string): CachedResolvedModuleWithFailedLookupLocations | undefined;
         resolveTypeReferenceDirectives(typeDirectiveNames: string[], containingFile: string): ResolvedTypeReferenceDirective[];
 
         invalidateResolutionOfFile(filePath: Path): void;
@@ -33,7 +33,7 @@ namespace ts {
         resolvedFileName: string | undefined;
     }
 
-    interface ResolvedModuleWithFailedLookupLocations extends ts.ResolvedModuleWithFailedLookupLocations, ResolutionWithFailedLookupLocations {
+    interface CachedResolvedModuleWithFailedLookupLocations extends ts.ResolvedModuleWithFailedLookupLocations, ResolutionWithFailedLookupLocations {
     }
 
     interface ResolvedTypeReferenceDirectiveWithFailedLookupLocations extends ts.ResolvedTypeReferenceDirectiveWithFailedLookupLocations, ResolutionWithFailedLookupLocations {
@@ -85,8 +85,8 @@ namespace ts {
         // The resolvedModuleNames and resolvedTypeReferenceDirectives are the cache of resolutions per file.
         // The key in the map is source file's path.
         // The values are Map of resolutions with key being name lookedup.
-        const resolvedModuleNames = createMap<Map<ResolvedModuleWithFailedLookupLocations>>();
-        const perDirectoryResolvedModuleNames = createMap<Map<ResolvedModuleWithFailedLookupLocations>>();
+        const resolvedModuleNames = createMap<Map<CachedResolvedModuleWithFailedLookupLocations>>();
+        const perDirectoryResolvedModuleNames = createMap<Map<CachedResolvedModuleWithFailedLookupLocations>>();
         const nonRelaticeModuleNameCache = createMap<PerModuleNameCache>();
         const moduleResolutionCache = createModuleResolutionCacheWithMaps(
             perDirectoryResolvedModuleNames,
@@ -133,7 +133,7 @@ namespace ts {
             clear
         };
 
-        function getResolvedModule(resolution: ResolvedModuleWithFailedLookupLocations) {
+        function getResolvedModule(resolution: CachedResolvedModuleWithFailedLookupLocations) {
             return resolution.resolvedModule;
         }
 
@@ -211,7 +211,7 @@ namespace ts {
             clearPerDirectoryResolutions();
         }
 
-        function resolveModuleName(moduleName: string, containingFile: string, compilerOptions: CompilerOptions, host: ModuleResolutionHost): ResolvedModuleWithFailedLookupLocations {
+        function resolveModuleName(moduleName: string, containingFile: string, compilerOptions: CompilerOptions, host: ModuleResolutionHost): CachedResolvedModuleWithFailedLookupLocations {
             const primaryResult = ts.resolveModuleName(moduleName, containingFile, compilerOptions, host, moduleResolutionCache);
             // return result immediately only if global cache support is not enabled or if it is .ts, .tsx or .d.ts
             if (!resolutionHost.getGlobalCache) {
@@ -328,7 +328,7 @@ namespace ts {
         }
 
         function resolveModuleNames(moduleNames: string[], containingFile: string, reusedNames: string[] | undefined): ResolvedModuleFull[] {
-            return resolveNamesWithLocalCache<ResolvedModuleWithFailedLookupLocations, ResolvedModuleFull>(
+            return resolveNamesWithLocalCache<CachedResolvedModuleWithFailedLookupLocations, ResolvedModuleFull>(
                 moduleNames, containingFile,
                 resolvedModuleNames, perDirectoryResolvedModuleNames,
                 resolveModuleName, getResolvedModule,
@@ -336,7 +336,7 @@ namespace ts {
             );
         }
 
-        function getResolvedModuleWithFailedLookupLocationsFromCache(moduleName: string, containingFile: string): ResolvedModuleWithFailedLookupLocations | undefined {
+        function getResolvedModuleWithFailedLookupLocationsFromCache(moduleName: string, containingFile: string): CachedResolvedModuleWithFailedLookupLocations | undefined {
             const cache = resolvedModuleNames.get(resolutionHost.toPath(containingFile));
             return cache && cache.get(moduleName);
         }
diff --git a/src/compiler/tsconfig.json b/src/compiler/tsconfig.json
index b2ed458b8b4..8a7ba50c62c 100644
--- a/src/compiler/tsconfig.json
+++ b/src/compiler/tsconfig.json
@@ -1,19 +1,9 @@
 {
     "extends": "../tsconfig-base",
     "compilerOptions": {
-        "removeComments": true,
-        "outFile": "../../built/local/tsc.js",
-        "declaration": true
+        "outFile": "../../built/local/compiler.js"
     },
     "files": [
-        "types.ts",
-        "performance.ts",
-        "core.ts",
-        "sys.ts",
-        "diagnosticInformationMap.generated.ts",
-        "scanner.ts",
-        "utilities.ts",
-        "parser.ts",
         "binder.ts",
         "symbolWalker.ts",
         "moduleNameResolver.ts",
@@ -46,8 +36,10 @@
         "resolutionCache.ts",
         "moduleSpecifiers.ts",
         "watch.ts",
-        "commandLineParser.ts",
-        "tsbuild.ts",
-        "tsc.ts",
+        "tsbuild.ts"
+    ],
+    "references": [
+        { "path": "../core" },
+        { "path": "../parser" }
     ]
 }
diff --git a/src/compiler/core.ts b/src/core/core.ts
similarity index 52%
rename from src/compiler/core.ts
rename to src/core/core.ts
index 0ec284d1882..4797f3f085b 100644
--- a/src/compiler/core.ts
+++ b/src/core/core.ts
@@ -7,25 +7,62 @@ namespace ts {
 }
 
 namespace ts {
-    export function isExternalModuleNameRelative(moduleName: string): boolean {
-        // TypeScript 1.0 spec (April 2014): 11.2.1
-        // An external module name is "relative" if the first term is "." or "..".
-        // Update: We also consider a path like `C:\foo.ts` "relative" because we do not search for it in `node_modules` or treat it as an ambient module.
-        return pathIsRelative(moduleName) || isRootedDiskPath(moduleName);
+    /**
+     * Type of objects whose values are all of the same type.
+     * The `in` and `for-in` operators can *not* be safely used,
+     * since `Object.prototype` may be modified by outside code.
+     */
+    export interface MapLike<T> {
+        [index: string]: T;
     }
 
-    export function sortAndDeduplicateDiagnostics<T extends Diagnostic>(diagnostics: ReadonlyArray<T>): T[] {
-        return sortAndDeduplicate<T>(diagnostics, compareDiagnostics);
+    export interface SortedArray<T> extends Array<T> {
+        " __sortedArrayBrand": any;
     }
 }
 
 /* @internal */
 namespace ts {
-    export const emptyArray: never[] = [] as never[];
-    export function closeFileWatcher(watcher: FileWatcher) {
-        watcher.close();
+    /* @internal */
+    export type EqualityComparer<T> = (a: T, b: T) => boolean;
+
+    /* @internal */
+    export type Comparer<T> = (a: T, b: T) => Comparison;
+
+    export const enum Comparison {
+        LessThan    = -1,
+        EqualTo     = 0,
+        GreaterThan = 1
     }
 
+    /** ES6 Map interface, only read methods included. */
+    export interface ReadonlyMap<T> {
+        get(key: string): T | undefined;
+        has(key: string): boolean;
+        forEach(action: (value: T, key: string) => void): void;
+        readonly size: number;
+        keys(): Iterator<string>;
+        values(): Iterator<T>;
+        entries(): Iterator<[string, T]>;
+    }
+
+    /** ES6 Map interface. */
+    export interface Map<T> extends ReadonlyMap<T> {
+        set(key: string, value: T): this;
+        delete(key: string): boolean;
+        clear(): void;
+    }
+
+    /** ES6 Iterator type. */
+    export interface Iterator<T> {
+        next(): { value: T, done: false } | { value: never, done: true };
+    }
+
+    /** Array that is only intended to be pushed to, never read. */
+    export interface Push<T> {
+        push(...values: T[]): void;
+    }
+    
     /** Create a MapLike with good performance. */
     function createDictionaryObject<T>(): MapLike<T> {
         const map = Object.create(/*prototype*/ null); // tslint:disable-line:no-null-keyword
@@ -44,21 +81,6 @@ namespace ts {
         return new MapCtr<T>();
     }
 
-    /** Create a new escaped identifier map. */
-    export function createUnderscoreEscapedMap<T>(): UnderscoreEscapedMap<T> {
-        return new MapCtr<T>() as UnderscoreEscapedMap<T>;
-    }
-
-    export function createSymbolTable(symbols?: ReadonlyArray<Symbol>): SymbolTable {
-        const result = createMap<Symbol>() as SymbolTable;
-        if (symbols) {
-            for (const symbol of symbols) {
-                result.set(symbol.escapedName, symbol);
-            }
-        }
-        return result;
-    }
-
     export function createMapFromEntries<T>(entries: [string, T][]): Map<T> {
         const map = createMap<T>();
         for (const [key, value] of entries) {
@@ -85,7 +107,7 @@ namespace ts {
     declare const Map: { new <T>(): Map<T> } | undefined;
     // Internet Explorer's Map doesn't support iteration, so don't use it.
     // tslint:disable-next-line no-in-operator variable-name
-    const MapCtr = typeof Map !== "undefined" && "entries" in Map.prototype ? Map : shimMap();
+    export const MapCtr = typeof Map !== "undefined" && "entries" in Map.prototype ? Map : shimMap();
 
     // Keep the class inside a function so it doesn't get compiled if it's not used.
     function shimMap(): { new <T>(): Map<T> } {
@@ -166,21 +188,10 @@ namespace ts {
         };
     }
 
-    export function toPath(fileName: string, basePath: string | undefined, getCanonicalFileName: (path: string) => string): Path {
-        const nonCanonicalizedPath = isRootedDiskPath(fileName)
-            ? normalizePath(fileName)
-            : getNormalizedAbsolutePath(fileName, basePath);
-        return <Path>getCanonicalFileName(nonCanonicalizedPath);
-    }
-
     export function length(array: ReadonlyArray<any> | undefined): number {
         return array ? array.length : 0;
     }
 
-    export function hasEntries(map: ReadonlyUnderscoreEscapedMap<any> | undefined): map is ReadonlyUnderscoreEscapedMap<any> {
-        return !!map && !!map.size;
-    }
-
     /**
      * Iterates through 'array' by index and performs the callback on each element of array until the callback
      * returns a truthy value, then returns that value.
@@ -226,28 +237,6 @@ namespace ts {
         }
     }
 
-    /**
-     * Iterates through the parent chain of a node and performs the callback on each parent until the callback
-     * returns a truthy value, then returns that value.
-     * If no such value is found, it applies the callback until the parent pointer is undefined or the callback returns "quit"
-     * At that point findAncestor returns undefined.
-     */
-    export function findAncestor<T extends Node>(node: Node | undefined, callback: (element: Node) => element is T): T | undefined;
-    export function findAncestor(node: Node | undefined, callback: (element: Node) => boolean | "quit"): Node | undefined;
-    export function findAncestor(node: Node, callback: (element: Node) => boolean | "quit"): Node | undefined {
-        while (node) {
-            const result = callback(node);
-            if (result === "quit") {
-                return undefined;
-            }
-            else if (result) {
-                return node;
-            }
-            node = node.parent;
-        }
-        return undefined;
-    }
-
     export function zipWith<T, U, V>(arrayA: ReadonlyArray<T>, arrayB: ReadonlyArray<U>, callback: (a: T, b: U, index: number) => V): V[] {
         const result: V[] = [];
         Debug.assertEqual(arrayA.length, arrayB.length);
@@ -873,25 +862,6 @@ namespace ts {
         return true;
     }
 
-    export function changesAffectModuleResolution(oldOptions: CompilerOptions, newOptions: CompilerOptions): boolean {
-        return !oldOptions ||
-            (oldOptions.module !== newOptions.module) ||
-            (oldOptions.moduleResolution !== newOptions.moduleResolution) ||
-            (oldOptions.noResolve !== newOptions.noResolve) ||
-            (oldOptions.target !== newOptions.target) ||
-            (oldOptions.noLib !== newOptions.noLib) ||
-            (oldOptions.jsx !== newOptions.jsx) ||
-            (oldOptions.allowJs !== newOptions.allowJs) ||
-            (oldOptions.rootDir !== newOptions.rootDir) ||
-            (oldOptions.configFilePath !== newOptions.configFilePath) ||
-            (oldOptions.baseUrl !== newOptions.baseUrl) ||
-            (oldOptions.maxNodeModuleJsDepth !== newOptions.maxNodeModuleJsDepth) ||
-            !arrayIsEqualTo(oldOptions.lib, newOptions.lib) ||
-            !arrayIsEqualTo(oldOptions.typeRoots, newOptions.typeRoots) ||
-            !arrayIsEqualTo(oldOptions.rootDirs, newOptions.rootDirs) ||
-            !equalOwnProperties(oldOptions.paths, newOptions.paths);
-    }
-
     /**
      * Compacts an array, removing any falsey elements.
      */
@@ -1293,46 +1263,6 @@ namespace ts {
         return result;
     }
 
-    /**
-     * Calls `callback` for each entry in the map, returning the first truthy result.
-     * Use `map.forEach` instead for normal iteration.
-     */
-    export function forEachEntry<T, U>(map: ReadonlyUnderscoreEscapedMap<T>, callback: (value: T, key: __String) => U | undefined): U | undefined;
-    export function forEachEntry<T, U>(map: ReadonlyMap<T>, callback: (value: T, key: string) => U | undefined): U | undefined;
-    export function forEachEntry<T, U>(map: ReadonlyUnderscoreEscapedMap<T> | ReadonlyMap<T>, callback: (value: T, key: (string & __String)) => U | undefined): U | undefined {
-        const iterator = map.entries();
-        for (let { value: pair, done } = iterator.next(); !done; { value: pair, done } = iterator.next()) {
-            const [key, value] = pair;
-            const result = callback(value, key as (string & __String));
-            if (result) {
-                return result;
-            }
-        }
-        return undefined;
-    }
-
-    /** `forEachEntry` for just keys. */
-    export function forEachKey<T>(map: ReadonlyUnderscoreEscapedMap<{}>, callback: (key: __String) => T | undefined): T | undefined;
-    export function forEachKey<T>(map: ReadonlyMap<{}>, callback: (key: string) => T | undefined): T | undefined;
-    export function forEachKey<T>(map: ReadonlyUnderscoreEscapedMap<{}> | ReadonlyMap<{}>, callback: (key: string & __String) => T | undefined): T | undefined {
-        const iterator = map.keys();
-        for (let { value: key, done } = iterator.next(); !done; { value: key, done } = iterator.next()) {
-            const result = callback(key as string & __String);
-            if (result) {
-                return result;
-            }
-        }
-        return undefined;
-    }
-
-    /** Copy entries from `source` to `target`. */
-    export function copyEntries<T>(source: ReadonlyUnderscoreEscapedMap<T>, target: UnderscoreEscapedMap<T>): void;
-    export function copyEntries<T>(source: ReadonlyMap<T>, target: Map<T>): void;
-    export function copyEntries<T, U extends UnderscoreEscapedMap<T> | Map<T>>(source: U, target: U): void {
-        (source as Map<T>).forEach((value, key) => {
-            (target as Map<T>).set(key, value);
-        });
-    }
 
     export function assign<T extends object>(t: T, ...args: (T | undefined)[]) {
         for (const arg of args) {
@@ -1401,18 +1331,6 @@ namespace ts {
         return result;
     }
 
-    /**
-     * Creates a set from the elements of an array.
-     *
-     * @param array the array of input elements.
-     */
-    export function arrayToSet(array: ReadonlyArray<string>): Map<true>;
-    export function arrayToSet<T>(array: ReadonlyArray<T>, makeKey: (value: T) => string | undefined): Map<true>;
-    export function arrayToSet<T>(array: ReadonlyArray<T>, makeKey: (value: T) => __String | undefined): UnderscoreEscapedMap<true>;
-    export function arrayToSet(array: ReadonlyArray<any>, makeKey?: (value: any) => string | __String | undefined): Map<true> | UnderscoreEscapedMap<true> {
-        return arrayToMap<any, true>(array, makeKey || (s => s), () => true);
-    }
-
     export function arrayToMultiMap<T>(values: ReadonlyArray<T>, makeKey: (value: T) => string): MultiMap<T>;
     export function arrayToMultiMap<T, U>(values: ReadonlyArray<T>, makeKey: (value: T) => string, makeValue: (value: T) => U): MultiMap<U>;
     export function arrayToMultiMap<T, U>(values: ReadonlyArray<T>, makeKey: (value: T) => string, makeValue: (value: T) => T | U = identity): MultiMap<T | U> {
@@ -1427,15 +1345,6 @@ namespace ts {
         return arrayFrom(arrayToMultiMap(values, getGroupId).values());
     }
 
-    export function cloneMap(map: SymbolTable): SymbolTable;
-    export function cloneMap<T>(map: ReadonlyMap<T>): Map<T>;
-    export function cloneMap<T>(map: ReadonlyUnderscoreEscapedMap<T>): UnderscoreEscapedMap<T>;
-    export function cloneMap<T>(map: ReadonlyMap<T> | ReadonlyUnderscoreEscapedMap<T> | SymbolTable): Map<T> | UnderscoreEscapedMap<T> | SymbolTable {
-        const clone = createMap<T>();
-        copyEntries(map as Map<T>, clone);
-        return clone;
-    }
-
     export function clone<T>(object: T): T {
         const result: any = {};
         for (const id in object) {
@@ -1530,12 +1439,7 @@ namespace ts {
     export function cast<TOut extends TIn, TIn = any>(value: TIn | undefined, test: (value: TIn) => value is TOut): TOut {
         if (value !== undefined && test(value)) return value;
 
-        if (value && typeof (value as any).kind === "number") {
-            return Debug.fail(`Invalid cast. The supplied ${Debug.showSyntaxKind(value as any as Node)} did not pass the test '${Debug.getFunctionName(test)}'.`);
-        }
-        else {
-            return Debug.fail(`Invalid cast. The supplied value did not pass the test '${Debug.getFunctionName(test)}'.`);
-        }
+        return Debug.fail(`Invalid cast. The supplied value ${value} did not pass the test '${Debug.getFunctionName(test)}'.`);
     }
 
     /** Does nothing. */
@@ -1635,112 +1539,99 @@ namespace ts {
         }
     }
 
-    export function formatStringFromArgs(text: string, args: ArrayLike<string>, baseIndex = 0): string {
-        return text.replace(/{(\d+)}/g, (_match, index: string) => Debug.assertDefined(args[+index + baseIndex]));
+    export const enum AssertionLevel {
+        None = 0,
+        Normal = 1,
+        Aggressive = 2,
+        VeryAggressive = 3,
     }
 
-    export let localizedDiagnosticMessages: MapLike<string> | undefined;
+    /**
+     * Safer version of `Function` which should not be called.
+     * Every function should be assignable to this, but this should not be assignable to every function.
+     */
+    export type AnyFunction = (...args: never[]) => void;
 
-    export function getLocaleSpecificMessage(message: DiagnosticMessage) {
-        return localizedDiagnosticMessages && localizedDiagnosticMessages[message.key] || message.message;
-    }
+    export namespace Debug {
+        export let currentAssertionLevel = AssertionLevel.None;
+        export let isDebugging = false;
 
-    export function createFileDiagnostic(file: SourceFile, start: number, length: number, message: DiagnosticMessage, ...args: (string | number | undefined)[]): DiagnosticWithLocation;
-    export function createFileDiagnostic(file: SourceFile, start: number, length: number, message: DiagnosticMessage): DiagnosticWithLocation {
-        Debug.assertGreaterThanOrEqual(start, 0);
-        Debug.assertGreaterThanOrEqual(length, 0);
-
-        if (file) {
-            Debug.assertLessThanOrEqual(start, file.text.length);
-            Debug.assertLessThanOrEqual(start + length, file.text.length);
+        export function shouldAssert(level: AssertionLevel): boolean {
+            return currentAssertionLevel >= level;
         }
 
-        let text = getLocaleSpecificMessage(message);
-
-        if (arguments.length > 4) {
-            text = formatStringFromArgs(text, arguments, 4);
+        export function assert(expression: boolean, message?: string, verboseDebugInfo?: string | (() => string), stackCrawlMark?: AnyFunction): void {
+            if (!expression) {
+                if (verboseDebugInfo) {
+                    message += "\r\nVerbose Debug Information: " + (typeof verboseDebugInfo === "string" ? verboseDebugInfo : verboseDebugInfo());
+                }
+                fail(message ? "False expression: " + message : "False expression.", stackCrawlMark || assert);
+            }
         }
 
-        return {
-            file,
-            start,
-            length,
-
-            messageText: text,
-            category: message.category,
-            code: message.code,
-            reportsUnnecessary: message.reportsUnnecessary,
-        };
-    }
-
-    /* internal */
-    export function formatMessage(_dummy: any, message: DiagnosticMessage): string {
-        let text = getLocaleSpecificMessage(message);
-
-        if (arguments.length > 2) {
-            text = formatStringFromArgs(text, arguments, 2);
+        export function assertEqual<T>(a: T, b: T, msg?: string, msg2?: string): void {
+            if (a !== b) {
+                const message = msg ? msg2 ? `${msg} ${msg2}` : msg : "";
+                fail(`Expected ${a} === ${b}. ${message}`);
+            }
         }
 
-        return text;
-    }
-
-    export function createCompilerDiagnostic(message: DiagnosticMessage, ...args: (string | number | undefined)[]): Diagnostic;
-    export function createCompilerDiagnostic(message: DiagnosticMessage): Diagnostic {
-        let text = getLocaleSpecificMessage(message);
-
-        if (arguments.length > 1) {
-            text = formatStringFromArgs(text, arguments, 1);
+        export function assertLessThan(a: number, b: number, msg?: string): void {
+            if (a >= b) {
+                fail(`Expected ${a} < ${b}. ${msg || ""}`);
+            }
         }
 
-        return {
-            file: undefined,
-            start: undefined,
-            length: undefined,
-
-            messageText: text,
-            category: message.category,
-            code: message.code,
-            reportsUnnecessary: message.reportsUnnecessary,
-        };
-    }
-
-    export function createCompilerDiagnosticFromMessageChain(chain: DiagnosticMessageChain): Diagnostic {
-        return {
-            file: undefined,
-            start: undefined,
-            length: undefined,
-
-            code: chain.code,
-            category: chain.category,
-            messageText: chain.next ? chain : chain.messageText,
-        };
-    }
-
-    export function chainDiagnosticMessages(details: DiagnosticMessageChain | undefined, message: DiagnosticMessage, ...args: (string | undefined)[]): DiagnosticMessageChain;
-    export function chainDiagnosticMessages(details: DiagnosticMessageChain | undefined, message: DiagnosticMessage): DiagnosticMessageChain {
-        let text = getLocaleSpecificMessage(message);
-
-        if (arguments.length > 2) {
-            text = formatStringFromArgs(text, arguments, 2);
+        export function assertLessThanOrEqual(a: number, b: number): void {
+            if (a > b) {
+                fail(`Expected ${a} <= ${b}`);
+            }
         }
 
-        return {
-            messageText: text,
-            category: message.category,
-            code: message.code,
-
-            next: details
-        };
-    }
-
-    export function concatenateDiagnosticMessageChains(headChain: DiagnosticMessageChain, tailChain: DiagnosticMessageChain): DiagnosticMessageChain {
-        let lastChain = headChain;
-        while (lastChain.next) {
-            lastChain = lastChain.next;
+        export function assertGreaterThanOrEqual(a: number, b: number): void {
+            if (a < b) {
+                fail(`Expected ${a} >= ${b}`);
+            }
         }
 
-        lastChain.next = tailChain;
-        return headChain;
+        export function fail(message?: string, stackCrawlMark?: AnyFunction): never {
+            debugger;
+            const e = new Error(message ? `Debug Failure. ${message}` : "Debug Failure.");
+            if ((<any>Error).captureStackTrace) {
+                (<any>Error).captureStackTrace(e, stackCrawlMark || fail);
+            }
+            throw e;
+        }
+
+        export function assertDefined<T>(value: T | null | undefined, message?: string): T {
+            if (value === undefined || value === null) return fail(message);
+            return value;
+        }
+
+        export function assertEachDefined<T, A extends ReadonlyArray<T>>(value: A, message?: string): A {
+            for (const v of value) {
+                assertDefined(v, message);
+            }
+            return value;
+        }
+
+        export function assertNever(member: never, message?: string, stackCrawlMark?: AnyFunction): never {
+            return fail(message || `Illegal value: ${member}`, stackCrawlMark || assertNever);
+        }
+
+        export function getFunctionName(func: AnyFunction) {
+            if (typeof func !== "function") {
+                return "";
+            }
+            else if (func.hasOwnProperty("name")) {
+                return (<any>func).name;
+            }
+            else {
+                const text = Function.prototype.toString.call(func);
+                const match = /^function\s+([\w\$]+)\s*\(/.exec(text);
+                return match ? match[1] : "";
+            }
+        }
     }
 
     export function equateValues<T>(a: T, b: T) {
@@ -1957,50 +1848,11 @@ namespace ts {
             comparer(a[key], b[key]);
     }
 
-    function getDiagnosticFilePath(diagnostic: Diagnostic): string | undefined {
-        return diagnostic.file ? diagnostic.file.path : undefined;
-    }
-
-    export function compareDiagnostics(d1: Diagnostic, d2: Diagnostic): Comparison {
-        return compareStringsCaseSensitive(getDiagnosticFilePath(d1), getDiagnosticFilePath(d2)) ||
-            compareValues(d1.start, d2.start) ||
-            compareValues(d1.length, d2.length) ||
-            compareValues(d1.code, d2.code) ||
-            compareMessageText(d1.messageText, d2.messageText) ||
-            Comparison.EqualTo;
-    }
-
     /** True is greater than false. */
     export function compareBooleans(a: boolean, b: boolean): Comparison {
         return compareValues(a ? 1 : 0, b ? 1 : 0);
     }
 
-    function compareMessageText(t1: string | DiagnosticMessageChain, t2: string | DiagnosticMessageChain): Comparison {
-        let text1: string | DiagnosticMessageChain | undefined = t1;
-        let text2: string | DiagnosticMessageChain | undefined = t2;
-        while (text1 && text2) {
-            // We still have both chains.
-            const string1 = isString(text1) ? text1 : text1.messageText;
-            const string2 = isString(text2) ? text2 : text2.messageText;
-
-            const res = compareStringsCaseSensitive(string1, string2);
-            if (res) {
-                return res;
-            }
-
-            text1 = isString(text1) ? undefined : text1.next;
-            text2 = isString(text2) ? undefined : text2.next;
-        }
-
-        if (!text1 && !text2) {
-            // if the chains are done, then these messages are the same.
-            return Comparison.EqualTo;
-        }
-
-        // We still have one chain remaining.  The shorter chain should come first.
-        return text1 ? Comparison.GreaterThan : Comparison.LessThan;
-    }
-
     /**
      * Given a name and a list of names that are *not* equal to the name, return a spelling suggestion if there is one that is close enough.
      * Names less than length 3 only check for case-insensitive equality, not Levenshtein distance.
@@ -2098,621 +1950,6 @@ namespace ts {
         return res > max ? undefined : res;
     }
 
-    export function getEmitScriptTarget(compilerOptions: CompilerOptions) {
-        return compilerOptions.target || ScriptTarget.ES3;
-    }
-
-    export function getEmitModuleKind(compilerOptions: {module?: CompilerOptions["module"], target?: CompilerOptions["target"]}) {
-        return typeof compilerOptions.module === "number" ?
-            compilerOptions.module :
-            getEmitScriptTarget(compilerOptions) >= ScriptTarget.ES2015 ? ModuleKind.ES2015 : ModuleKind.CommonJS;
-    }
-
-    export function getEmitModuleResolutionKind(compilerOptions: CompilerOptions) {
-        let moduleResolution = compilerOptions.moduleResolution;
-        if (moduleResolution === undefined) {
-            moduleResolution = getEmitModuleKind(compilerOptions) === ModuleKind.CommonJS ? ModuleResolutionKind.NodeJs : ModuleResolutionKind.Classic;
-        }
-        return moduleResolution;
-    }
-
-    export function unreachableCodeIsError(options: CompilerOptions): boolean {
-        return options.allowUnreachableCode === false;
-    }
-
-    export function unusedLabelIsError(options: CompilerOptions): boolean {
-        return options.allowUnusedLabels === false;
-    }
-
-    export function getAreDeclarationMapsEnabled(options: CompilerOptions) {
-        return !!(options.declaration && options.declarationMap);
-    }
-
-    export function getAllowSyntheticDefaultImports(compilerOptions: CompilerOptions) {
-        const moduleKind = getEmitModuleKind(compilerOptions);
-        return compilerOptions.allowSyntheticDefaultImports !== undefined
-            ? compilerOptions.allowSyntheticDefaultImports
-            : compilerOptions.esModuleInterop
-                ? moduleKind !== ModuleKind.None && moduleKind < ModuleKind.ES2015
-                : moduleKind === ModuleKind.System;
-    }
-
-    export function getEmitDeclarations(compilerOptions: CompilerOptions): boolean {
-        return !!(compilerOptions.declaration || compilerOptions.composite);
-    }
-
-    export type StrictOptionName = "noImplicitAny" | "noImplicitThis" | "strictNullChecks" | "strictFunctionTypes" | "strictPropertyInitialization" | "alwaysStrict";
-
-    export function getStrictOptionValue(compilerOptions: CompilerOptions, flag: StrictOptionName): boolean {
-        return compilerOptions[flag] === undefined ? !!compilerOptions.strict : !!compilerOptions[flag];
-    }
-
-    export function hasZeroOrOneAsteriskCharacter(str: string): boolean {
-        let seenAsterisk = false;
-        for (let i = 0; i < str.length; i++) {
-            if (str.charCodeAt(i) === CharacterCodes.asterisk) {
-                if (!seenAsterisk) {
-                    seenAsterisk = true;
-                }
-                else {
-                    // have already seen asterisk
-                    return false;
-                }
-            }
-        }
-        return true;
-    }
-
-    //
-    // Paths
-    //
-
-
-    /**
-     * Internally, we represent paths as strings with '/' as the directory separator.
-     * When we make system calls (eg: LanguageServiceHost.getDirectory()),
-     * we expect the host to correctly handle paths in our specified format.
-     */
-    export const directorySeparator = "/";
-    const altDirectorySeparator = "\\";
-    const urlSchemeSeparator = "://";
-
-    const backslashRegExp = /\\/g;
-
-    /**
-     * Normalize path separators.
-     */
-    export function normalizeSlashes(path: string): string {
-        return path.replace(backslashRegExp, directorySeparator);
-    }
-
-    function isVolumeCharacter(charCode: number) {
-        return (charCode >= CharacterCodes.a && charCode <= CharacterCodes.z) ||
-            (charCode >= CharacterCodes.A && charCode <= CharacterCodes.Z);
-    }
-
-    function getFileUrlVolumeSeparatorEnd(url: string, start: number) {
-        const ch0 = url.charCodeAt(start);
-        if (ch0 === CharacterCodes.colon) return start + 1;
-        if (ch0 === CharacterCodes.percent && url.charCodeAt(start + 1) === CharacterCodes._3) {
-            const ch2 = url.charCodeAt(start + 2);
-            if (ch2 === CharacterCodes.a || ch2 === CharacterCodes.A) return start + 3;
-        }
-        return -1;
-    }
-
-    /**
-     * Returns length of the root part of a path or URL (i.e. length of "/", "x:/", "//server/share/, file:///user/files").
-     * If the root is part of a URL, the twos-complement of the root length is returned.
-     */
-    function getEncodedRootLength(path: string): number {
-        if (!path) return 0;
-        const ch0 = path.charCodeAt(0);
-
-        // POSIX or UNC
-        if (ch0 === CharacterCodes.slash || ch0 === CharacterCodes.backslash) {
-            if (path.charCodeAt(1) !== ch0) return 1; // POSIX: "/" (or non-normalized "\")
-
-            const p1 = path.indexOf(ch0 === CharacterCodes.slash ? directorySeparator : altDirectorySeparator, 2);
-            if (p1 < 0) return path.length; // UNC: "//server" or "\\server"
-
-            return p1 + 1; // UNC: "//server/" or "\\server\"
-        }
-
-        // DOS
-        if (isVolumeCharacter(ch0) && path.charCodeAt(1) === CharacterCodes.colon) {
-            const ch2 = path.charCodeAt(2);
-            if (ch2 === CharacterCodes.slash || ch2 === CharacterCodes.backslash) return 3; // DOS: "c:/" or "c:\"
-            if (path.length === 2) return 2; // DOS: "c:" (but not "c:d")
-        }
-
-        // URL
-        const schemeEnd = path.indexOf(urlSchemeSeparator);
-        if (schemeEnd !== -1) {
-            const authorityStart = schemeEnd + urlSchemeSeparator.length;
-            const authorityEnd = path.indexOf(directorySeparator, authorityStart);
-            if (authorityEnd !== -1) { // URL: "file:///", "file://server/", "file://server/path"
-                // For local "file" URLs, include the leading DOS volume (if present).
-                // Per https://www.ietf.org/rfc/rfc1738.txt, a host of "" or "localhost" is a
-                // special case interpreted as "the machine from which the URL is being interpreted".
-                const scheme = path.slice(0, schemeEnd);
-                const authority = path.slice(authorityStart, authorityEnd);
-                if (scheme === "file" && (authority === "" || authority === "localhost") &&
-                    isVolumeCharacter(path.charCodeAt(authorityEnd + 1))) {
-                    const volumeSeparatorEnd = getFileUrlVolumeSeparatorEnd(path, authorityEnd + 2);
-                    if (volumeSeparatorEnd !== -1) {
-                        if (path.charCodeAt(volumeSeparatorEnd) === CharacterCodes.slash) {
-                            // URL: "file:///c:/", "file://localhost/c:/", "file:///c%3a/", "file://localhost/c%3a/"
-                            return ~(volumeSeparatorEnd + 1);
-                        }
-                        if (volumeSeparatorEnd === path.length) {
-                            // URL: "file:///c:", "file://localhost/c:", "file:///c$3a", "file://localhost/c%3a"
-                            // but not "file:///c:d" or "file:///c%3ad"
-                            return ~volumeSeparatorEnd;
-                        }
-                    }
-                }
-                return ~(authorityEnd + 1); // URL: "file://server/", "http://server/"
-            }
-            return ~path.length; // URL: "file://server", "http://server"
-        }
-
-        // relative
-        return 0;
-    }
-
-    /**
-     * Returns length of the root part of a path or URL (i.e. length of "/", "x:/", "//server/share/, file:///user/files").
-     *
-     * For example:
-     * ```ts
-     * getRootLength("a") === 0                   // ""
-     * getRootLength("/") === 1                   // "/"
-     * getRootLength("c:") === 2                  // "c:"
-     * getRootLength("c:d") === 0                 // ""
-     * getRootLength("c:/") === 3                 // "c:/"
-     * getRootLength("c:\\") === 3                // "c:\\"
-     * getRootLength("//server") === 7            // "//server"
-     * getRootLength("//server/share") === 8      // "//server/"
-     * getRootLength("\\\\server") === 7          // "\\\\server"
-     * getRootLength("\\\\server\\share") === 8   // "\\\\server\\"
-     * getRootLength("file:///path") === 8        // "file:///"
-     * getRootLength("file:///c:") === 10         // "file:///c:"
-     * getRootLength("file:///c:d") === 8         // "file:///"
-     * getRootLength("file:///c:/path") === 11    // "file:///c:/"
-     * getRootLength("file://server") === 13      // "file://server"
-     * getRootLength("file://server/path") === 14 // "file://server/"
-     * getRootLength("http://server") === 13      // "http://server"
-     * getRootLength("http://server/path") === 14 // "http://server/"
-     * ```
-     */
-    export function getRootLength(path: string) {
-        const rootLength = getEncodedRootLength(path);
-        return rootLength < 0 ? ~rootLength : rootLength;
-    }
-
-    // TODO(rbuckton): replace references with `resolvePath`
-    export function normalizePath(path: string): string {
-        return resolvePath(path);
-    }
-
-    export function normalizePathAndParts(path: string): { path: string, parts: string[] } {
-        path = normalizeSlashes(path);
-        const [root, ...parts] = reducePathComponents(getPathComponents(path));
-        if (parts.length) {
-            const joinedParts = root + parts.join(directorySeparator);
-            return { path: hasTrailingDirectorySeparator(path) ? ensureTrailingDirectorySeparator(joinedParts) : joinedParts, parts };
-        }
-        else {
-            return { path: root, parts };
-        }
-    }
-
-    /**
-     * Returns the path except for its basename. Semantics align with NodeJS's `path.dirname`
-     * except that we support URL's as well.
-     *
-     * ```ts
-     * getDirectoryPath("/path/to/file.ext") === "/path/to"
-     * getDirectoryPath("/path/to/") === "/path"
-     * getDirectoryPath("/") === "/"
-     * ```
-     */
-    export function getDirectoryPath(path: Path): Path;
-    /**
-     * Returns the path except for its basename. Semantics align with NodeJS's `path.dirname`
-     * except that we support URL's as well.
-     *
-     * ```ts
-     * getDirectoryPath("/path/to/file.ext") === "/path/to"
-     * getDirectoryPath("/path/to/") === "/path"
-     * getDirectoryPath("/") === "/"
-     * ```
-     */
-    export function getDirectoryPath(path: string): string;
-    export function getDirectoryPath(path: string): string {
-        path = normalizeSlashes(path);
-
-        // If the path provided is itself the root, then return it.
-        const rootLength = getRootLength(path);
-        if (rootLength === path.length) return path;
-
-        // return the leading portion of the path up to the last (non-terminal) directory separator
-        // but not including any trailing directory separator.
-        path = removeTrailingDirectorySeparator(path);
-        return path.slice(0, Math.max(rootLength, path.lastIndexOf(directorySeparator)));
-    }
-
-    export function isUrl(path: string) {
-        return getEncodedRootLength(path) < 0;
-    }
-
-    export function pathIsRelative(path: string): boolean {
-        return /^\.\.?($|[\\/])/.test(path);
-    }
-
-    /**
-     * Determines whether a path is an absolute path (e.g. starts with `/`, or a dos path
-     * like `c:`, `c:\` or `c:/`).
-     */
-    export function isRootedDiskPath(path: string) {
-        return getEncodedRootLength(path) > 0;
-    }
-
-    /**
-     * Determines whether a path consists only of a path root.
-     */
-    export function isDiskPathRoot(path: string) {
-        const rootLength = getEncodedRootLength(path);
-        return rootLength > 0 && rootLength === path.length;
-    }
-
-    export function convertToRelativePath(absoluteOrRelativePath: string, basePath: string, getCanonicalFileName: (path: string) => string): string {
-        return !isRootedDiskPath(absoluteOrRelativePath)
-            ? absoluteOrRelativePath
-            : getRelativePathToDirectoryOrUrl(basePath, absoluteOrRelativePath, basePath, getCanonicalFileName, /*isAbsolutePathAnUrl*/ false);
-    }
-
-    function pathComponents(path: string, rootLength: number) {
-        const root = path.substring(0, rootLength);
-        const rest = path.substring(rootLength).split(directorySeparator);
-        if (rest.length && !lastOrUndefined(rest)) rest.pop();
-        return [root, ...rest];
-    }
-
-    /**
-     * Parse a path into an array containing a root component (at index 0) and zero or more path
-     * components (at indices > 0). The result is not normalized.
-     * If the path is relative, the root component is `""`.
-     * If the path is absolute, the root component includes the first path separator (`/`).
-     */
-    export function getPathComponents(path: string, currentDirectory = "") {
-        path = combinePaths(currentDirectory, path);
-        const rootLength = getRootLength(path);
-        return pathComponents(path, rootLength);
-    }
-
-    /**
-     * Reduce an array of path components to a more simplified path by navigating any
-     * `"."` or `".."` entries in the path.
-     */
-    export function reducePathComponents(components: ReadonlyArray<string>) {
-        if (!some(components)) return [];
-        const reduced = [components[0]];
-        for (let i = 1; i < components.length; i++) {
-            const component = components[i];
-            if (!component) continue;
-            if (component === ".") continue;
-            if (component === "..") {
-                if (reduced.length > 1) {
-                    if (reduced[reduced.length - 1] !== "..") {
-                        reduced.pop();
-                        continue;
-                    }
-                }
-                else if (reduced[0]) continue;
-            }
-            reduced.push(component);
-        }
-        return reduced;
-    }
-
-    /**
-     * Parse a path into an array containing a root component (at index 0) and zero or more path
-     * components (at indices > 0). The result is normalized.
-     * If the path is relative, the root component is `""`.
-     * If the path is absolute, the root component includes the first path separator (`/`).
-     */
-    export function getNormalizedPathComponents(path: string, currentDirectory: string | undefined) {
-        return reducePathComponents(getPathComponents(path, currentDirectory));
-    }
-
-    export function getNormalizedAbsolutePath(fileName: string, currentDirectory: string | undefined) {
-        return getPathFromPathComponents(getNormalizedPathComponents(fileName, currentDirectory));
-    }
-
-    /**
-     * Formats a parsed path consisting of a root component (at index 0) and zero or more path
-     * segments (at indices > 0).
-     */
-    export function getPathFromPathComponents(pathComponents: ReadonlyArray<string>) {
-        if (pathComponents.length === 0) return "";
-
-        const root = pathComponents[0] && ensureTrailingDirectorySeparator(pathComponents[0]);
-        if (pathComponents.length === 1) return root;
-
-        return root + pathComponents.slice(1).join(directorySeparator);
-    }
-
-    function getPathComponentsRelativeTo(from: string, to: string, stringEqualityComparer: (a: string, b: string) => boolean, getCanonicalFileName: GetCanonicalFileName) {
-        const fromComponents = reducePathComponents(getPathComponents(from));
-        const toComponents = reducePathComponents(getPathComponents(to));
-
-        let start: number;
-        for (start = 0; start < fromComponents.length && start < toComponents.length; start++) {
-            const fromComponent = getCanonicalFileName(fromComponents[start]);
-            const toComponent = getCanonicalFileName(toComponents[start]);
-            const comparer = start === 0 ? equateStringsCaseInsensitive : stringEqualityComparer;
-            if (!comparer(fromComponent, toComponent)) break;
-        }
-
-        if (start === 0) {
-            return toComponents;
-        }
-
-        const components = toComponents.slice(start);
-        const relative: string[] = [];
-        for (; start < fromComponents.length; start++) {
-            relative.push("..");
-        }
-        return ["", ...relative, ...components];
-    }
-
-    export function getRelativePathFromFile(from: string, to: string, getCanonicalFileName: GetCanonicalFileName) {
-        return ensurePathIsNonModuleName(getRelativePathFromDirectory(getDirectoryPath(from), to, getCanonicalFileName));
-    }
-
-    /**
-     * Gets a relative path that can be used to traverse between `from` and `to`.
-     */
-    export function getRelativePathFromDirectory(from: string, to: string, ignoreCase: boolean): string;
-    /**
-     * Gets a relative path that can be used to traverse between `from` and `to`.
-     */
-    // tslint:disable-next-line:unified-signatures
-    export function getRelativePathFromDirectory(fromDirectory: string, to: string, getCanonicalFileName: GetCanonicalFileName): string;
-    export function getRelativePathFromDirectory(fromDirectory: string, to: string, getCanonicalFileNameOrIgnoreCase: GetCanonicalFileName | boolean) {
-        Debug.assert((getRootLength(fromDirectory) > 0) === (getRootLength(to) > 0), "Paths must either both be absolute or both be relative");
-        const getCanonicalFileName = typeof getCanonicalFileNameOrIgnoreCase === "function" ? getCanonicalFileNameOrIgnoreCase : identity;
-        const ignoreCase = typeof getCanonicalFileNameOrIgnoreCase === "boolean" ? getCanonicalFileNameOrIgnoreCase : false;
-        const pathComponents = getPathComponentsRelativeTo(fromDirectory, to, ignoreCase ? equateStringsCaseInsensitive : equateStringsCaseSensitive, getCanonicalFileName);
-        return getPathFromPathComponents(pathComponents);
-    }
-
-    export function getRelativePathToDirectoryOrUrl(directoryPathOrUrl: string, relativeOrAbsolutePath: string, currentDirectory: string, getCanonicalFileName: GetCanonicalFileName, isAbsolutePathAnUrl: boolean) {
-        const pathComponents = getPathComponentsRelativeTo(
-            resolvePath(currentDirectory, directoryPathOrUrl),
-            resolvePath(currentDirectory, relativeOrAbsolutePath),
-            equateStringsCaseSensitive,
-            getCanonicalFileName
-        );
-
-        const firstComponent = pathComponents[0];
-        if (isAbsolutePathAnUrl && isRootedDiskPath(firstComponent)) {
-            const prefix = firstComponent.charAt(0) === directorySeparator ? "file://" : "file:///";
-            pathComponents[0] = prefix + firstComponent;
-        }
-
-        return getPathFromPathComponents(pathComponents);
-    }
-
-    /**
-     * Ensures a path is either absolute (prefixed with `/` or `c:`) or dot-relative (prefixed
-     * with `./` or `../`) so as not to be confused with an unprefixed module name.
-     */
-    export function ensurePathIsNonModuleName(path: string): string {
-        return getRootLength(path) === 0 && !pathIsRelative(path) ? "./" + path : path;
-    }
-
-    /**
-     * Returns the path except for its containing directory name.
-     * Semantics align with NodeJS's `path.basename` except that we support URL's as well.
-     *
-     * ```ts
-     * getBaseFileName("/path/to/file.ext") === "file.ext"
-     * getBaseFileName("/path/to/") === "to"
-     * getBaseFileName("/") === ""
-     * ```
-     */
-    export function getBaseFileName(path: string): string;
-    /**
-     * Gets the portion of a path following the last (non-terminal) separator (`/`).
-     * Semantics align with NodeJS's `path.basename` except that we support URL's as well.
-     * If the base name has any one of the provided extensions, it is removed.
-     *
-     * ```ts
-     * getBaseFileName("/path/to/file.ext", ".ext", true) === "file"
-     * getBaseFileName("/path/to/file.js", ".ext", true) === "file.js"
-     * ```
-     */
-    export function getBaseFileName(path: string, extensions: string | ReadonlyArray<string>, ignoreCase: boolean): string;
-    export function getBaseFileName(path: string, extensions?: string | ReadonlyArray<string>, ignoreCase?: boolean) {
-        path = normalizeSlashes(path);
-
-        // if the path provided is itself the root, then it has not file name.
-        const rootLength = getRootLength(path);
-        if (rootLength === path.length) return "";
-
-        // return the trailing portion of the path starting after the last (non-terminal) directory
-        // separator but not including any trailing directory separator.
-        path = removeTrailingDirectorySeparator(path);
-        const name = path.slice(Math.max(getRootLength(path), path.lastIndexOf(directorySeparator) + 1));
-        const extension = extensions !== undefined && ignoreCase !== undefined ? getAnyExtensionFromPath(name, extensions, ignoreCase) : undefined;
-        return extension ? name.slice(0, name.length - extension.length) : name;
-    }
-
-    /**
-     * Combines paths. If a path is absolute, it replaces any previous path.
-     */
-    export function combinePaths(path: string, ...paths: (string | undefined)[]): string {
-        if (path) path = normalizeSlashes(path);
-        for (let relativePath of paths) {
-            if (!relativePath) continue;
-            relativePath = normalizeSlashes(relativePath);
-            if (!path || getRootLength(relativePath) !== 0) {
-                path = relativePath;
-            }
-            else {
-                path = ensureTrailingDirectorySeparator(path) + relativePath;
-            }
-        }
-        return path;
-    }
-
-    /**
-     * Combines and resolves paths. If a path is absolute, it replaces any previous path. Any
-     * `.` and `..` path components are resolved.
-     */
-    export function resolvePath(path: string, ...paths: (string | undefined)[]): string {
-        const combined = some(paths) ? combinePaths(path, ...paths) : normalizeSlashes(path);
-        const normalized = getPathFromPathComponents(reducePathComponents(getPathComponents(combined)));
-        return normalized && hasTrailingDirectorySeparator(combined) ? ensureTrailingDirectorySeparator(normalized) : normalized;
-    }
-
-    /**
-     * Determines whether a path has a trailing separator (`/` or `\\`).
-     */
-    export function hasTrailingDirectorySeparator(path: string) {
-        if (path.length === 0) return false;
-        const ch = path.charCodeAt(path.length - 1);
-        return ch === CharacterCodes.slash || ch === CharacterCodes.backslash;
-    }
-
-    /**
-     * Removes a trailing directory separator from a path.
-     * @param path The path.
-     */
-    export function removeTrailingDirectorySeparator(path: Path): Path;
-    export function removeTrailingDirectorySeparator(path: string): string;
-    export function removeTrailingDirectorySeparator(path: string) {
-        if (hasTrailingDirectorySeparator(path)) {
-            return path.substr(0, path.length - 1);
-        }
-
-        return path;
-    }
-
-    /**
-     * Adds a trailing directory separator to a path, if it does not already have one.
-     * @param path The path.
-     */
-    export function ensureTrailingDirectorySeparator(path: Path): Path;
-    export function ensureTrailingDirectorySeparator(path: string): string;
-    export function ensureTrailingDirectorySeparator(path: string) {
-        if (!hasTrailingDirectorySeparator(path)) {
-            return path + directorySeparator;
-        }
-
-        return path;
-    }
-
-    function comparePathsWorker(a: string, b: string, componentComparer: (a: string, b: string) => Comparison) {
-        if (a === b) return Comparison.EqualTo;
-        if (a === undefined) return Comparison.LessThan;
-        if (b === undefined) return Comparison.GreaterThan;
-        const aComponents = reducePathComponents(getPathComponents(a));
-        const bComponents = reducePathComponents(getPathComponents(b));
-        const sharedLength = Math.min(aComponents.length, bComponents.length);
-        for (let i = 0; i < sharedLength; i++) {
-            const stringComparer = i === 0 ? compareStringsCaseInsensitive : componentComparer;
-            const result = stringComparer(aComponents[i], bComponents[i]);
-            if (result !== Comparison.EqualTo) {
-                return result;
-            }
-        }
-        return compareValues(aComponents.length, bComponents.length);
-    }
-
-    /**
-     * Performs a case-sensitive comparison of two paths.
-     */
-    export function comparePathsCaseSensitive(a: string, b: string) {
-        return comparePathsWorker(a, b, compareStringsCaseSensitive);
-    }
-
-    /**
-     * Performs a case-insensitive comparison of two paths.
-     */
-    export function comparePathsCaseInsensitive(a: string, b: string) {
-        return comparePathsWorker(a, b, compareStringsCaseInsensitive);
-    }
-
-    export function comparePaths(a: string, b: string, ignoreCase?: boolean): Comparison;
-    export function comparePaths(a: string, b: string, currentDirectory: string, ignoreCase?: boolean): Comparison;
-    export function comparePaths(a: string, b: string, currentDirectory?: string | boolean, ignoreCase?: boolean) {
-        if (typeof currentDirectory === "string") {
-            a = combinePaths(currentDirectory, a);
-            b = combinePaths(currentDirectory, b);
-        }
-        else if (typeof currentDirectory === "boolean") {
-            ignoreCase = currentDirectory;
-        }
-        return comparePathsWorker(a, b, getStringComparer(ignoreCase));
-    }
-
-    export function containsPath(parent: string, child: string, ignoreCase?: boolean): boolean;
-    export function containsPath(parent: string, child: string, currentDirectory: string, ignoreCase?: boolean): boolean;
-    export function containsPath(parent: string, child: string, currentDirectory?: string | boolean, ignoreCase?: boolean) {
-        if (typeof currentDirectory === "string") {
-            parent = combinePaths(currentDirectory, parent);
-            child = combinePaths(currentDirectory, child);
-        }
-        else if (typeof currentDirectory === "boolean") {
-            ignoreCase = currentDirectory;
-        }
-        if (parent === undefined || child === undefined) return false;
-        if (parent === child) return true;
-        const parentComponents = reducePathComponents(getPathComponents(parent));
-        const childComponents = reducePathComponents(getPathComponents(child));
-        if (childComponents.length < parentComponents.length) {
-            return false;
-        }
-
-        const componentEqualityComparer = ignoreCase ? equateStringsCaseInsensitive : equateStringsCaseSensitive;
-        for (let i = 0; i < parentComponents.length; i++) {
-            const equalityComparer = i === 0 ? equateStringsCaseInsensitive : componentEqualityComparer;
-            if (!equalityComparer(parentComponents[i], childComponents[i])) {
-                return false;
-            }
-        }
-
-        return true;
-    }
-
-    export function startsWith(str: string, prefix: string): boolean {
-        return str.lastIndexOf(prefix, 0) === 0;
-    }
-
-    export function removePrefix(str: string, prefix: string): string {
-        return startsWith(str, prefix) ? str.substr(prefix.length) : str;
-    }
-
-    export function tryRemovePrefix(str: string, prefix: string): string | undefined {
-        return startsWith(str, prefix) ? str.substring(prefix.length) : undefined;
-    }
-
-    export function tryRemoveDirectoryPrefix(path: string, dirPath: string): string | undefined {
-        const a = tryRemovePrefix(path, dirPath);
-        if (a === undefined) return undefined;
-        switch (a.charCodeAt(0)) {
-            case CharacterCodes.slash:
-            case CharacterCodes.backslash:
-                return a.slice(1);
-            default:
-                return undefined;
-        }
-    }
-
     export function endsWith(str: string, suffix: string): boolean {
         const expectedPos = str.length - suffix.length;
         return expectedPos >= 0 && str.indexOf(suffix, expectedPos) === expectedPos;
@@ -2730,10 +1967,6 @@ namespace ts {
         return str.indexOf(substring) !== -1;
     }
 
-    export function hasExtension(fileName: string): boolean {
-        return stringContains(getBaseFileName(fileName), ".");
-    }
-
     export function fileExtensionIs(path: string, extension: string): boolean {
         return path.length > extension.length && endsWith(path, extension);
     }
@@ -2748,462 +1981,6 @@ namespace ts {
         return false;
     }
 
-    // Reserved characters, forces escaping of any non-word (or digit), non-whitespace character.
-    // It may be inefficient (we could just match (/[-[\]{}()*+?.,\\^$|#\s]/g), but this is future
-    // proof.
-    const reservedCharacterPattern = /[^\w\s\/]/g;
-    const wildcardCharCodes = [CharacterCodes.asterisk, CharacterCodes.question];
-
-    export const commonPackageFolders: ReadonlyArray<string> = ["node_modules", "bower_components", "jspm_packages"];
-
-    const implicitExcludePathRegexPattern = `(?!(${commonPackageFolders.join("|")})(/|$))`;
-
-    interface WildcardMatcher {
-        singleAsteriskRegexFragment: string;
-        doubleAsteriskRegexFragment: string;
-        replaceWildcardCharacter: (match: string) => string;
-    }
-
-    const filesMatcher: WildcardMatcher = {
-        /**
-         * Matches any single directory segment unless it is the last segment and a .min.js file
-         * Breakdown:
-         *  [^./]                   # matches everything up to the first . character (excluding directory separators)
-         *  (\\.(?!min\\.js$))?     # matches . characters but not if they are part of the .min.js file extension
-         */
-        singleAsteriskRegexFragment: "([^./]|(\\.(?!min\\.js$))?)*",
-        /**
-         * Regex for the ** wildcard. Matches any number of subdirectories. When used for including
-         * files or directories, does not match subdirectories that start with a . character
-         */
-        doubleAsteriskRegexFragment: `(/${implicitExcludePathRegexPattern}[^/.][^/]*)*?`,
-        replaceWildcardCharacter: match => replaceWildcardCharacter(match, filesMatcher.singleAsteriskRegexFragment)
-    };
-
-    const directoriesMatcher: WildcardMatcher = {
-        singleAsteriskRegexFragment: "[^/]*",
-        /**
-         * Regex for the ** wildcard. Matches any number of subdirectories. When used for including
-         * files or directories, does not match subdirectories that start with a . character
-         */
-        doubleAsteriskRegexFragment: `(/${implicitExcludePathRegexPattern}[^/.][^/]*)*?`,
-        replaceWildcardCharacter: match => replaceWildcardCharacter(match, directoriesMatcher.singleAsteriskRegexFragment)
-    };
-
-    const excludeMatcher: WildcardMatcher = {
-        singleAsteriskRegexFragment: "[^/]*",
-        doubleAsteriskRegexFragment: "(/.+?)?",
-        replaceWildcardCharacter: match => replaceWildcardCharacter(match, excludeMatcher.singleAsteriskRegexFragment)
-    };
-
-    const wildcardMatchers = {
-        files: filesMatcher,
-        directories: directoriesMatcher,
-        exclude: excludeMatcher
-    };
-
-    export function getRegularExpressionForWildcard(specs: ReadonlyArray<string> | undefined, basePath: string, usage: "files" | "directories" | "exclude"): string | undefined {
-        const patterns = getRegularExpressionsForWildcards(specs, basePath, usage);
-        if (!patterns || !patterns.length) {
-            return undefined;
-        }
-
-        const pattern = patterns.map(pattern => `(${pattern})`).join("|");
-        // If excluding, match "foo/bar/baz...", but if including, only allow "foo".
-        const terminator = usage === "exclude" ? "($|/)" : "$";
-        return `^(${pattern})${terminator}`;
-    }
-
-    function getRegularExpressionsForWildcards(specs: ReadonlyArray<string> | undefined, basePath: string, usage: "files" | "directories" | "exclude"): string[] | undefined {
-        if (specs === undefined || specs.length === 0) {
-            return undefined;
-        }
-
-        return flatMap(specs, spec =>
-            spec && getSubPatternFromSpec(spec, basePath, usage, wildcardMatchers[usage]));
-    }
-
-    /**
-     * An "includes" path "foo" is implicitly a glob "foo/** /*" (without the space) if its last component has no extension,
-     * and does not contain any glob characters itself.
-     */
-    export function isImplicitGlob(lastPathComponent: string): boolean {
-        return !/[.*?]/.test(lastPathComponent);
-    }
-
-    function getSubPatternFromSpec(spec: string, basePath: string, usage: "files" | "directories" | "exclude", { singleAsteriskRegexFragment, doubleAsteriskRegexFragment, replaceWildcardCharacter }: WildcardMatcher): string | undefined {
-        let subpattern = "";
-        let hasWrittenComponent = false;
-        const components = getNormalizedPathComponents(spec, basePath);
-        const lastComponent = last(components);
-        if (usage !== "exclude" && lastComponent === "**") {
-            return undefined;
-        }
-
-        // getNormalizedPathComponents includes the separator for the root component.
-        // We need to remove to create our regex correctly.
-        components[0] = removeTrailingDirectorySeparator(components[0]);
-
-        if (isImplicitGlob(lastComponent)) {
-            components.push("**", "*");
-        }
-
-        let optionalCount = 0;
-        for (let component of components) {
-            if (component === "**") {
-                subpattern += doubleAsteriskRegexFragment;
-            }
-            else {
-                if (usage === "directories") {
-                    subpattern += "(";
-                    optionalCount++;
-                }
-
-                if (hasWrittenComponent) {
-                    subpattern += directorySeparator;
-                }
-
-                if (usage !== "exclude") {
-                    let componentPattern = "";
-                    // The * and ? wildcards should not match directories or files that start with . if they
-                    // appear first in a component. Dotted directories and files can be included explicitly
-                    // like so: **/.*/.*
-                    if (component.charCodeAt(0) === CharacterCodes.asterisk) {
-                        componentPattern += "([^./]" + singleAsteriskRegexFragment + ")?";
-                        component = component.substr(1);
-                    }
-                    else if (component.charCodeAt(0) === CharacterCodes.question) {
-                        componentPattern += "[^./]";
-                        component = component.substr(1);
-                    }
-
-                    componentPattern += component.replace(reservedCharacterPattern, replaceWildcardCharacter);
-
-                    // Patterns should not include subfolders like node_modules unless they are
-                    // explicitly included as part of the path.
-                    //
-                    // As an optimization, if the component pattern is the same as the component,
-                    // then there definitely were no wildcard characters and we do not need to
-                    // add the exclusion pattern.
-                    if (componentPattern !== component) {
-                        subpattern += implicitExcludePathRegexPattern;
-                    }
-
-                    subpattern += componentPattern;
-                }
-                else {
-                    subpattern += component.replace(reservedCharacterPattern, replaceWildcardCharacter);
-                }
-            }
-
-            hasWrittenComponent = true;
-        }
-
-        while (optionalCount > 0) {
-            subpattern += ")?";
-            optionalCount--;
-        }
-
-        return subpattern;
-    }
-
-    function replaceWildcardCharacter(match: string, singleAsteriskRegexFragment: string) {
-        return match === "*" ? singleAsteriskRegexFragment : match === "?" ? "[^/]" : "\\" + match;
-    }
-
-    export interface FileSystemEntries {
-        readonly files: ReadonlyArray<string>;
-        readonly directories: ReadonlyArray<string>;
-    }
-
-    export interface FileMatcherPatterns {
-        /** One pattern for each "include" spec. */
-        includeFilePatterns: ReadonlyArray<string> | undefined;
-        /** One pattern matching one of any of the "include" specs. */
-        includeFilePattern: string | undefined;
-        includeDirectoryPattern: string | undefined;
-        excludePattern: string | undefined;
-        basePaths: ReadonlyArray<string>;
-    }
-
-    /** @param path directory of the tsconfig.json */
-    export function getFileMatcherPatterns(path: string, excludes: ReadonlyArray<string> | undefined, includes: ReadonlyArray<string> | undefined, useCaseSensitiveFileNames: boolean, currentDirectory: string): FileMatcherPatterns {
-        path = normalizePath(path);
-        currentDirectory = normalizePath(currentDirectory);
-        const absolutePath = combinePaths(currentDirectory, path);
-
-        return {
-            includeFilePatterns: map(getRegularExpressionsForWildcards(includes, absolutePath, "files"), pattern => `^${pattern}$`),
-            includeFilePattern: getRegularExpressionForWildcard(includes, absolutePath, "files"),
-            includeDirectoryPattern: getRegularExpressionForWildcard(includes, absolutePath, "directories"),
-            excludePattern: getRegularExpressionForWildcard(excludes, absolutePath, "exclude"),
-            basePaths: getBasePaths(path, includes, useCaseSensitiveFileNames)
-        };
-    }
-
-    export function getRegexFromPattern(pattern: string, useCaseSensitiveFileNames: boolean): RegExp {
-        return new RegExp(pattern, useCaseSensitiveFileNames ? "" : "i");
-    }
-
-    /** @param path directory of the tsconfig.json */
-    export function matchFiles(path: string, extensions: ReadonlyArray<string> | undefined, excludes: ReadonlyArray<string> | undefined, includes: ReadonlyArray<string> | undefined, useCaseSensitiveFileNames: boolean, currentDirectory: string, depth: number | undefined, getFileSystemEntries: (path: string) => FileSystemEntries): string[] {
-        path = normalizePath(path);
-        currentDirectory = normalizePath(currentDirectory);
-
-        const patterns = getFileMatcherPatterns(path, excludes, includes, useCaseSensitiveFileNames, currentDirectory);
-
-        const includeFileRegexes = patterns.includeFilePatterns && patterns.includeFilePatterns.map(pattern => getRegexFromPattern(pattern, useCaseSensitiveFileNames));
-        const includeDirectoryRegex = patterns.includeDirectoryPattern && getRegexFromPattern(patterns.includeDirectoryPattern, useCaseSensitiveFileNames);
-        const excludeRegex = patterns.excludePattern && getRegexFromPattern(patterns.excludePattern, useCaseSensitiveFileNames);
-
-        // Associate an array of results with each include regex. This keeps results in order of the "include" order.
-        // If there are no "includes", then just put everything in results[0].
-        const results: string[][] = includeFileRegexes ? includeFileRegexes.map(() => []) : [[]];
-
-        for (const basePath of patterns.basePaths) {
-            visitDirectory(basePath, combinePaths(currentDirectory, basePath), depth);
-        }
-
-        return flatten<string>(results);
-
-        function visitDirectory(path: string, absolutePath: string, depth: number | undefined) {
-            const { files, directories } = getFileSystemEntries(path);
-
-            for (const current of sort<string>(files, compareStringsCaseSensitive)) {
-                const name = combinePaths(path, current);
-                const absoluteName = combinePaths(absolutePath, current);
-                if (extensions && !fileExtensionIsOneOf(name, extensions)) continue;
-                if (excludeRegex && excludeRegex.test(absoluteName)) continue;
-                if (!includeFileRegexes) {
-                    results[0].push(name);
-                }
-                else {
-                    const includeIndex = findIndex(includeFileRegexes, re => re.test(absoluteName));
-                    if (includeIndex !== -1) {
-                        results[includeIndex].push(name);
-                    }
-                }
-            }
-
-            if (depth !== undefined) {
-                depth--;
-                if (depth === 0) {
-                    return;
-                }
-            }
-
-            for (const current of sort<string>(directories, compareStringsCaseSensitive)) {
-                const name = combinePaths(path, current);
-                const absoluteName = combinePaths(absolutePath, current);
-                if ((!includeDirectoryRegex || includeDirectoryRegex.test(absoluteName)) &&
-                    (!excludeRegex || !excludeRegex.test(absoluteName))) {
-                    visitDirectory(name, absoluteName, depth);
-                }
-            }
-        }
-    }
-
-    /**
-     * Computes the unique non-wildcard base paths amongst the provided include patterns.
-     */
-    function getBasePaths(path: string, includes: ReadonlyArray<string> | undefined, useCaseSensitiveFileNames: boolean): string[] {
-        // Storage for our results in the form of literal paths (e.g. the paths as written by the user).
-        const basePaths: string[] = [path];
-
-        if (includes) {
-            // Storage for literal base paths amongst the include patterns.
-            const includeBasePaths: string[] = [];
-            for (const include of includes) {
-                // We also need to check the relative paths by converting them to absolute and normalizing
-                // in case they escape the base path (e.g "..\somedirectory")
-                const absolute: string = isRootedDiskPath(include) ? include : normalizePath(combinePaths(path, include));
-                // Append the literal and canonical candidate base paths.
-                includeBasePaths.push(getIncludeBasePath(absolute));
-            }
-
-            // Sort the offsets array using either the literal or canonical path representations.
-            includeBasePaths.sort(getStringComparer(!useCaseSensitiveFileNames));
-
-            // Iterate over each include base path and include unique base paths that are not a
-            // subpath of an existing base path
-            for (const includeBasePath of includeBasePaths) {
-                if (every(basePaths, basePath => !containsPath(basePath, includeBasePath, path, !useCaseSensitiveFileNames))) {
-                    basePaths.push(includeBasePath);
-                }
-            }
-        }
-
-        return basePaths;
-    }
-
-    function getIncludeBasePath(absolute: string): string {
-        const wildcardOffset = indexOfAnyCharCode(absolute, wildcardCharCodes);
-        if (wildcardOffset < 0) {
-            // No "*" or "?" in the path
-            return !hasExtension(absolute)
-                ? absolute
-                : removeTrailingDirectorySeparator(getDirectoryPath(absolute));
-        }
-        return absolute.substring(0, absolute.lastIndexOf(directorySeparator, wildcardOffset));
-    }
-
-    export function ensureScriptKind(fileName: string, scriptKind: ScriptKind | undefined): ScriptKind {
-        // Using scriptKind as a condition handles both:
-        // - 'scriptKind' is unspecified and thus it is `undefined`
-        // - 'scriptKind' is set and it is `Unknown` (0)
-        // If the 'scriptKind' is 'undefined' or 'Unknown' then we attempt
-        // to get the ScriptKind from the file name. If it cannot be resolved
-        // from the file name then the default 'TS' script kind is returned.
-        return scriptKind || getScriptKindFromFileName(fileName) || ScriptKind.TS;
-    }
-
-    export function getScriptKindFromFileName(fileName: string): ScriptKind {
-        const ext = fileName.substr(fileName.lastIndexOf("."));
-        switch (ext.toLowerCase()) {
-            case Extension.Js:
-                return ScriptKind.JS;
-            case Extension.Jsx:
-                return ScriptKind.JSX;
-            case Extension.Ts:
-                return ScriptKind.TS;
-            case Extension.Tsx:
-                return ScriptKind.TSX;
-            case Extension.Json:
-                return ScriptKind.JSON;
-            default:
-                return ScriptKind.Unknown;
-        }
-    }
-
-    /**
-     *  List of supported extensions in order of file resolution precedence.
-     */
-    export const supportedTypeScriptExtensions: ReadonlyArray<Extension> = [Extension.Ts, Extension.Tsx, Extension.Dts];
-    /** Must have ".d.ts" first because if ".ts" goes first, that will be detected as the extension instead of ".d.ts". */
-    export const supportedTypescriptExtensionsForExtractExtension: ReadonlyArray<Extension> = [Extension.Dts, Extension.Ts, Extension.Tsx];
-    export const supportedJavascriptExtensions: ReadonlyArray<Extension> = [Extension.Js, Extension.Jsx];
-    const allSupportedExtensions: ReadonlyArray<Extension> = [...supportedTypeScriptExtensions, ...supportedJavascriptExtensions];
-
-    export function getSupportedExtensions(options?: CompilerOptions, extraFileExtensions?: ReadonlyArray<FileExtensionInfo>): ReadonlyArray<string> {
-        const needJsExtensions = options && options.allowJs;
-
-        if (!extraFileExtensions || extraFileExtensions.length === 0) {
-            return needJsExtensions ? allSupportedExtensions : supportedTypeScriptExtensions;
-        }
-
-        const extensions = [
-            ...needJsExtensions ? allSupportedExtensions : supportedTypeScriptExtensions,
-            ...mapDefined(extraFileExtensions, x => x.scriptKind === ScriptKind.Deferred || needJsExtensions && isJavaScriptLike(x.scriptKind) ? x.extension : undefined)
-        ];
-
-        return deduplicate<string>(extensions, equateStringsCaseSensitive, compareStringsCaseSensitive);
-    }
-
-    function isJavaScriptLike(scriptKind: ScriptKind | undefined): boolean {
-        return scriptKind === ScriptKind.JS || scriptKind === ScriptKind.JSX;
-    }
-
-    export function hasJavaScriptFileExtension(fileName: string): boolean {
-        return some(supportedJavascriptExtensions, extension => fileExtensionIs(fileName, extension));
-    }
-
-    export function hasTypeScriptFileExtension(fileName: string): boolean {
-        return some(supportedTypeScriptExtensions, extension => fileExtensionIs(fileName, extension));
-    }
-
-    export function isSupportedSourceFileName(fileName: string, compilerOptions?: CompilerOptions, extraFileExtensions?: ReadonlyArray<FileExtensionInfo>) {
-        if (!fileName) { return false; }
-
-        for (const extension of getSupportedExtensions(compilerOptions, extraFileExtensions)) {
-            if (fileExtensionIs(fileName, extension)) {
-                return true;
-            }
-        }
-        return false;
-    }
-
-    /**
-     * Extension boundaries by priority. Lower numbers indicate higher priorities, and are
-     * aligned to the offset of the highest priority extension in the
-     * allSupportedExtensions array.
-     */
-    export const enum ExtensionPriority {
-        TypeScriptFiles = 0,
-        DeclarationAndJavaScriptFiles = 2,
-
-        Highest = TypeScriptFiles,
-        Lowest = DeclarationAndJavaScriptFiles,
-    }
-
-    export function getExtensionPriority(path: string, supportedExtensions: ReadonlyArray<string>): ExtensionPriority {
-        for (let i = supportedExtensions.length - 1; i >= 0; i--) {
-            if (fileExtensionIs(path, supportedExtensions[i])) {
-                return adjustExtensionPriority(<ExtensionPriority>i, supportedExtensions);
-            }
-        }
-
-        // If its not in the list of supported extensions, this is likely a
-        // TypeScript file with a non-ts extension
-        return ExtensionPriority.Highest;
-    }
-
-    /**
-     * Adjusts an extension priority to be the highest priority within the same range.
-     */
-    export function adjustExtensionPriority(extensionPriority: ExtensionPriority, supportedExtensions: ReadonlyArray<string>): ExtensionPriority {
-        if (extensionPriority < ExtensionPriority.DeclarationAndJavaScriptFiles) {
-            return ExtensionPriority.TypeScriptFiles;
-        }
-        else if (extensionPriority < supportedExtensions.length) {
-            return ExtensionPriority.DeclarationAndJavaScriptFiles;
-        }
-        else {
-            return supportedExtensions.length;
-        }
-    }
-
-    /**
-     * Gets the next lowest extension priority for a given priority.
-     */
-    export function getNextLowestExtensionPriority(extensionPriority: ExtensionPriority, supportedExtensions: ReadonlyArray<string>): ExtensionPriority {
-        if (extensionPriority < ExtensionPriority.DeclarationAndJavaScriptFiles) {
-            return ExtensionPriority.DeclarationAndJavaScriptFiles;
-        }
-        else {
-            return supportedExtensions.length;
-        }
-    }
-
-    const extensionsToRemove = [Extension.Dts, Extension.Ts, Extension.Js, Extension.Tsx, Extension.Jsx, Extension.Json];
-    export function removeFileExtension(path: string): string {
-        for (const ext of extensionsToRemove) {
-            const extensionless = tryRemoveExtension(path, ext);
-            if (extensionless !== undefined) {
-                return extensionless;
-            }
-        }
-        return path;
-    }
-
-    export function tryRemoveExtension(path: string, extension: string): string | undefined {
-        return fileExtensionIs(path, extension) ? removeExtension(path, extension) : undefined;
-    }
-
-    export function removeExtension(path: string, extension: string): string {
-        return path.substring(0, path.length - extension.length);
-    }
-
-    export function changeExtension<T extends string | Path>(path: T, newExtension: string): T {
-        return <T>changeAnyExtension(path, newExtension, extensionsToRemove, /*ignoreCase*/ false);
-    }
-
-    export function changeAnyExtension(path: string, ext: string): string;
-    export function changeAnyExtension(path: string, ext: string, extensions: string | ReadonlyArray<string>, ignoreCase: boolean): string;
-    export function changeAnyExtension(path: string, ext: string, extensions?: string | ReadonlyArray<string>, ignoreCase?: boolean) {
-        const pathext = extensions !== undefined && ignoreCase !== undefined ? getAnyExtensionFromPath(path, extensions, ignoreCase) : getAnyExtensionFromPath(path);
-        return pathext ? path.slice(0, path.length - pathext.length) + (startsWith(ext, ".") ? ext : "." + ext) : path;
-    }
-
     /**
      * Takes a string like "jquery-min.4.2.3" and returns "jquery"
      */
@@ -3215,181 +1992,6 @@ namespace ts {
         return fileName.replace(trailingMinOrVersion, "").replace(trailingMinOrVersion, "");
     }
 
-    export interface ObjectAllocator {
-        getNodeConstructor(): new (kind: SyntaxKind, pos?: number, end?: number) => Node;
-        getTokenConstructor(): new <TKind extends SyntaxKind>(kind: TKind, pos?: number, end?: number) => Token<TKind>;
-        getIdentifierConstructor(): new (kind: SyntaxKind.Identifier, pos?: number, end?: number) => Identifier;
-        getSourceFileConstructor(): new (kind: SyntaxKind.SourceFile, pos?: number, end?: number) => SourceFile;
-        getSymbolConstructor(): new (flags: SymbolFlags, name: __String) => Symbol;
-        getTypeConstructor(): new (checker: TypeChecker, flags: TypeFlags) => Type;
-        getSignatureConstructor(): new (checker: TypeChecker) => Signature;
-        getSourceMapSourceConstructor(): new (fileName: string, text: string, skipTrivia?: (pos: number) => number) => SourceMapSource;
-    }
-
-    function Symbol(this: Symbol, flags: SymbolFlags, name: __String) {
-        this.flags = flags;
-        this.escapedName = name;
-        this.declarations = undefined!;
-        this.valueDeclaration = undefined!;
-        this.id = undefined;
-        this.mergeId = undefined;
-        this.parent = undefined;
-    }
-
-    function Type(this: Type, checker: TypeChecker, flags: TypeFlags) {
-        this.flags = flags;
-        if (Debug.isDebugging) {
-            this.checker = checker;
-        }
-    }
-
-    function Signature() {} // tslint:disable-line no-empty
-
-    function Node(this: Node, kind: SyntaxKind, pos: number, end: number) {
-        this.pos = pos;
-        this.end = end;
-        this.kind = kind;
-        this.id = 0;
-        this.flags = NodeFlags.None;
-        this.modifierFlagsCache = ModifierFlags.None;
-        this.transformFlags = TransformFlags.None;
-        this.parent = undefined!;
-        this.original = undefined;
-    }
-
-    function SourceMapSource(this: SourceMapSource, fileName: string, text: string, skipTrivia?: (pos: number) => number) {
-        this.fileName = fileName;
-        this.text = text;
-        this.skipTrivia = skipTrivia || (pos => pos);
-    }
-
-    export let objectAllocator: ObjectAllocator = {
-        getNodeConstructor: () => <any>Node,
-        getTokenConstructor: () => <any>Node,
-        getIdentifierConstructor: () => <any>Node,
-        getSourceFileConstructor: () => <any>Node,
-        getSymbolConstructor: () => <any>Symbol,
-        getTypeConstructor: () => <any>Type,
-        getSignatureConstructor: () => <any>Signature,
-        getSourceMapSourceConstructor: () => <any>SourceMapSource,
-    };
-
-    export const enum AssertionLevel {
-        None = 0,
-        Normal = 1,
-        Aggressive = 2,
-        VeryAggressive = 3,
-    }
-
-    /**
-     * Safer version of `Function` which should not be called.
-     * Every function should be assignable to this, but this should not be assignable to every function.
-     */
-    export type AnyFunction = (...args: never[]) => void;
-
-    export namespace Debug {
-        export let currentAssertionLevel = AssertionLevel.None;
-        export let isDebugging = false;
-
-        export function shouldAssert(level: AssertionLevel): boolean {
-            return currentAssertionLevel >= level;
-        }
-
-        export function assert(expression: boolean, message?: string, verboseDebugInfo?: string | (() => string), stackCrawlMark?: AnyFunction): void {
-            if (!expression) {
-                if (verboseDebugInfo) {
-                    message += "\r\nVerbose Debug Information: " + (typeof verboseDebugInfo === "string" ? verboseDebugInfo : verboseDebugInfo());
-                }
-                fail(message ? "False expression: " + message : "False expression.", stackCrawlMark || assert);
-            }
-        }
-
-        export function assertEqual<T>(a: T, b: T, msg?: string, msg2?: string): void {
-            if (a !== b) {
-                const message = msg ? msg2 ? `${msg} ${msg2}` : msg : "";
-                fail(`Expected ${a} === ${b}. ${message}`);
-            }
-        }
-
-        export function assertLessThan(a: number, b: number, msg?: string): void {
-            if (a >= b) {
-                fail(`Expected ${a} < ${b}. ${msg || ""}`);
-            }
-        }
-
-        export function assertLessThanOrEqual(a: number, b: number): void {
-            if (a > b) {
-                fail(`Expected ${a} <= ${b}`);
-            }
-        }
-
-        export function assertGreaterThanOrEqual(a: number, b: number): void {
-            if (a < b) {
-                fail(`Expected ${a} >= ${b}`);
-            }
-        }
-
-        export function fail(message?: string, stackCrawlMark?: AnyFunction): never {
-            debugger;
-            const e = new Error(message ? `Debug Failure. ${message}` : "Debug Failure.");
-            if ((<any>Error).captureStackTrace) {
-                (<any>Error).captureStackTrace(e, stackCrawlMark || fail);
-            }
-            throw e;
-        }
-
-        export function assertDefined<T>(value: T | null | undefined, message?: string): T {
-            if (value === undefined || value === null) return fail(message);
-            return value;
-        }
-
-        export function assertEachDefined<T, A extends ReadonlyArray<T>>(value: A, message?: string): A {
-            for (const v of value) {
-                assertDefined(v, message);
-            }
-            return value;
-        }
-
-        export function assertNever(member: never, message?: string, stackCrawlMark?: AnyFunction): never {
-            return fail(message || `Illegal value: ${member}`, stackCrawlMark || assertNever);
-        }
-
-        export function getFunctionName(func: AnyFunction) {
-            if (typeof func !== "function") {
-                return "";
-            }
-            else if (func.hasOwnProperty("name")) {
-                return (<any>func).name;
-            }
-            else {
-                const text = Function.prototype.toString.call(func);
-                const match = /^function\s+([\w\$]+)\s*\(/.exec(text);
-                return match ? match[1] : "";
-            }
-        }
-
-        export function showSymbol(symbol: Symbol): string {
-            const symbolFlags = (ts as any).SymbolFlags;
-            return `{ flags: ${symbolFlags ? showFlags(symbol.flags, symbolFlags) : symbol.flags}; declarations: ${map(symbol.declarations, showSyntaxKind)} }`;
-        }
-
-        function showFlags(flags: number, flagsEnum: { [flag: number]: string }): string {
-            const out: string[] = [];
-            for (let pow = 0; pow <= 30; pow++) {
-                const n = 1 << pow;
-                if (flags & n) {
-                    out.push(flagsEnum[n]);
-                }
-            }
-            return out.join("|");
-        }
-
-        export function showSyntaxKind(node: Node): string {
-            const syntaxKind = (ts as any).SyntaxKind;
-            return syntaxKind ? syntaxKind[node.kind] : node.kind.toString();
-        }
-    }
-
     /** Remove an item from an array, moving everything to its right one space left. */
     export function orderedRemoveItem<T>(array: T[], item: T): boolean {
         for (let i = 0; i < array.length; i++) {
@@ -3437,25 +2039,11 @@ namespace ts {
         return useCaseSensitiveFileNames ? identity : toLowerCase;
     }
 
-    /**
-     * patternStrings contains both pattern strings (containing "*") and regular strings.
-     * Return an exact match if possible, or a pattern match, or undefined.
-     * (These are verified by verifyCompilerOptions to have 0 or 1 "*" characters.)
-     */
-    export function matchPatternOrExact(patternStrings: ReadonlyArray<string>, candidate: string): string | Pattern | undefined {
-        const patterns: Pattern[] = [];
-        for (const patternString of patternStrings) {
-            const pattern = tryParsePattern(patternString);
-            if (pattern) {
-                patterns.push(pattern);
-            }
-            else if (patternString === candidate) {
-                // pattern was matched as is - no need to search further
-                return patternString;
-            }
-        }
-
-        return findBestPatternMatch(patterns, _ => _, candidate);
+    /** Represents a "prefix*suffix" pattern. */
+    /* @internal */
+    export interface Pattern {
+        prefix: string;
+        suffix: string;
     }
 
     export function patternText({ prefix, suffix }: Pattern): string {
@@ -3488,94 +2076,25 @@ namespace ts {
         return matchedValue;
     }
 
+    export function startsWith(str: string, prefix: string): boolean {
+        return str.lastIndexOf(prefix, 0) === 0;
+    }
+
+    export function removePrefix(str: string, prefix: string): string {
+        return startsWith(str, prefix) ? str.substr(prefix.length) : str;
+    }
+
+    export function tryRemovePrefix(str: string, prefix: string): string | undefined {
+        return startsWith(str, prefix) ? str.substring(prefix.length) : undefined;
+    }
+
+
     function isPatternMatch({ prefix, suffix }: Pattern, candidate: string) {
         return candidate.length >= prefix.length + suffix.length &&
             startsWith(candidate, prefix) &&
             endsWith(candidate, suffix);
     }
 
-    export function tryParsePattern(pattern: string): Pattern | undefined {
-        // This should be verified outside of here and a proper error thrown.
-        Debug.assert(hasZeroOrOneAsteriskCharacter(pattern));
-        const indexOfStar = pattern.indexOf("*");
-        return indexOfStar === -1 ? undefined : {
-            prefix: pattern.substr(0, indexOfStar),
-            suffix: pattern.substr(indexOfStar + 1)
-        };
-    }
-
-    export function positionIsSynthesized(pos: number): boolean {
-        // This is a fast way of testing the following conditions:
-        //  pos === undefined || pos === null || isNaN(pos) || pos < 0;
-        return !(pos >= 0);
-    }
-
-    /** True if an extension is one of the supported TypeScript extensions. */
-    export function extensionIsTypeScript(ext: Extension): boolean {
-        return ext === Extension.Ts || ext === Extension.Tsx || ext === Extension.Dts;
-    }
-
-    export function resolutionExtensionIsTypeScriptOrJson(ext: Extension) {
-        return extensionIsTypeScript(ext) || ext === Extension.Json;
-    }
-
-    /**
-     * Gets the extension from a path.
-     * Path must have a valid extension.
-     */
-    export function extensionFromPath(path: string): Extension {
-        const ext = tryGetExtensionFromPath(path);
-        return ext !== undefined ? ext : Debug.fail(`File ${path} has unknown extension.`);
-    }
-
-    export function isAnySupportedFileExtension(path: string): boolean {
-        return tryGetExtensionFromPath(path) !== undefined;
-    }
-
-    export function tryGetExtensionFromPath(path: string): Extension | undefined {
-        return find<Extension>(supportedTypescriptExtensionsForExtractExtension, e => fileExtensionIs(path, e)) || find(supportedJavascriptExtensions, e => fileExtensionIs(path, e));
-    }
-
-    function getAnyExtensionFromPathWorker(path: string, extensions: string | ReadonlyArray<string>, stringEqualityComparer: (a: string, b: string) => boolean) {
-        if (typeof extensions === "string") extensions = [extensions];
-        for (let extension of extensions) {
-            if (!startsWith(extension, ".")) extension = "." + extension;
-            if (path.length >= extension.length && path.charAt(path.length - extension.length) === ".") {
-                const pathExtension = path.slice(path.length - extension.length);
-                if (stringEqualityComparer(pathExtension, extension)) {
-                    return pathExtension;
-                }
-            }
-        }
-        return "";
-    }
-
-    /**
-     * Gets the file extension for a path.
-     */
-    export function getAnyExtensionFromPath(path: string): string;
-    /**
-     * Gets the file extension for a path, provided it is one of the provided extensions.
-     */
-    export function getAnyExtensionFromPath(path: string, extensions: string | ReadonlyArray<string>, ignoreCase: boolean): string;
-    export function getAnyExtensionFromPath(path: string, extensions?: string | ReadonlyArray<string>, ignoreCase?: boolean): string {
-        // Retrieves any string from the final "." onwards from a base file name.
-        // Unlike extensionFromPath, which throws an exception on unrecognized extensions.
-        if (extensions) {
-            return getAnyExtensionFromPathWorker(path, extensions, ignoreCase ? equateStringsCaseInsensitive : equateStringsCaseSensitive);
-        }
-        const baseFileName = getBaseFileName(path);
-        const extensionIndex = baseFileName.lastIndexOf(".");
-        if (extensionIndex >= 0) {
-            return baseFileName.substring(extensionIndex);
-        }
-        return "";
-    }
-
-    export function isCheckJsEnabledForFile(sourceFile: SourceFile, compilerOptions: CompilerOptions) {
-        return sourceFile.checkJsDirective ? sourceFile.checkJsDirective.enabled : compilerOptions.checkJs;
-    }
-
     export function and<T>(f: (arg: T) => boolean, g: (arg: T) => boolean) {
         return (arg: T) => f(arg) && g(arg);
     }
@@ -3586,11 +2105,6 @@ namespace ts {
 
     export function assertTypeIsNever(_: never): void { } // tslint:disable-line no-empty
 
-    export const emptyFileSystemEntries: FileSystemEntries = {
-        files: emptyArray,
-        directories: emptyArray
-    };
-
     export function singleElementArray<T>(t: T | undefined): T[] | undefined {
         return t === undefined ? undefined : [t];
     }
diff --git a/src/compiler/performance.ts b/src/core/performance.ts
similarity index 100%
rename from src/compiler/performance.ts
rename to src/core/performance.ts
diff --git a/src/core/tsconfig.json b/src/core/tsconfig.json
new file mode 100644
index 00000000000..087aeb81a3a
--- /dev/null
+++ b/src/core/tsconfig.json
@@ -0,0 +1,11 @@
+{
+    "extends": "../tsconfig-base",
+    "compilerOptions": {
+        "outFile": "../../built/local/core.js"
+    },
+    "files": [
+        "performance.ts",
+        "core.ts"
+    ],
+    "references": [ ]
+}
diff --git a/src/server/client.ts b/src/harness/client.ts
similarity index 100%
rename from src/server/client.ts
rename to src/harness/client.ts
diff --git a/src/harness/fourslash.ts b/src/harness/fourslash.ts
index 532ce5e0488..86c83bd73e2 100644
--- a/src/harness/fourslash.ts
+++ b/src/harness/fourslash.ts
@@ -1,30 +1,16 @@
-//
-// Copyright (c) Microsoft Corporation.  All rights reserved.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//   http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-//
-
-/// <reference path="..\services\services.ts" />
-/// <reference path="..\services\shims.ts" />
-/// <reference path="harnessLanguageService.ts" />
-/// <reference path="harness.ts" />
-/// <reference path="fourslashRunner.ts" />
-/// <reference path="./compiler.ts" />
-
 namespace FourSlash {
     ts.disableIncrementalParsing = false;
 
     import ArrayOrSingle = FourSlashInterface.ArrayOrSingle;
 
+    export const enum FourSlashTestType {
+        Native,
+        Shims,
+        ShimsWithPreprocess,
+        Server
+    }
+    
+    
     // Represents a parsed source file with metadata
     interface FourSlashFile {
         // The contents of the file (with markers, etc stripped out)
@@ -1317,7 +1303,7 @@ Actual: ${stringify(fullActual)}`);
         }
 
         private testDiagnostics(expected: ReadonlyArray<FourSlashInterface.Diagnostic>, diagnostics: ReadonlyArray<ts.Diagnostic>, category: string) {
-            assert.deepEqual(ts.realizeDiagnostics(diagnostics, ts.newLineCharacter), expected.map((e): ts.RealizedDiagnostic => ({
+            assert.deepEqual(ts.realizeDiagnostics(diagnostics, "\n"), expected.map((e): ts.RealizedDiagnostic => ({
                 message: e.message,
                 category,
                 code: e.code,
diff --git a/src/harness/harness.ts b/src/harness/harness.ts
index d325883fc11..f86892648c1 100644
--- a/src/harness/harness.ts
+++ b/src/harness/harness.ts
@@ -1,31 +1,3 @@
-
-//
-// Copyright (c) Microsoft Corporation.  All rights reserved.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//   http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-//
-
-/// <reference path="..\services\services.ts" />
-/// <reference path="..\services\shims.ts" />
-/// <reference path="..\server\session.ts" />
-/// <reference path="..\server\client.ts" />
-/// <reference path="sourceMapRecorder.ts"/>
-/// <reference path="runnerbase.ts"/>
-/// <reference path="./vfs.ts" />
-/// <reference types="node" />
-/// <reference types="mocha" />
-/// <reference types="chai" />
-
-
 // Block scoped definitions work poorly for global variables, temporarily enable var
 /* tslint:disable:no-var-keyword */
 
diff --git a/src/harness/harnessLanguageService.ts b/src/harness/harnessLanguageService.ts
index b2f24175e29..bb476ee699a 100644
--- a/src/harness/harnessLanguageService.ts
+++ b/src/harness/harnessLanguageService.ts
@@ -1,8 +1,3 @@
-/// <reference path="..\services\services.ts" />
-/// <reference path="..\services\shims.ts" />
-/// <reference path="..\server\client.ts" />
-/// <reference path="harness.ts" />
-
 namespace Harness.LanguageService {
     export class ScriptInfo {
         public version = 1;
diff --git a/src/harness/loggedIO.ts b/src/harness/loggedIO.ts
index 1e55b3e1a64..236289cb7bb 100644
--- a/src/harness/loggedIO.ts
+++ b/src/harness/loggedIO.ts
@@ -1,9 +1,3 @@
-/// <reference path="..\..\src\compiler\sys.ts" />
-/// <reference path="..\..\src\harness\harness.ts" />
-/// <reference path="..\..\src\harness\harnessLanguageService.ts" />
-/// <reference path="..\..\src\harness\runnerbase.ts" />
-/// <reference path="..\..\src\harness\typeWriter.ts" />
-
 interface FileInformation {
     contents?: string;
     contentsPath?: string;
diff --git a/src/harness/sourceMapRecorder.ts b/src/harness/sourceMapRecorder.ts
index 0804c281200..9a62da6bb6f 100644
--- a/src/harness/sourceMapRecorder.ts
+++ b/src/harness/sourceMapRecorder.ts
@@ -1,20 +1,3 @@
-//
-// Copyright (c) Microsoft Corporation.  All rights reserved.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//   http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-//
-
-///<reference path="harness.ts"/>
-
 namespace Harness.SourceMapRecorder {
 
     interface SourceMapSpanWithDecodeErrors {
diff --git a/src/harness/tsconfig.json b/src/harness/tsconfig.json
index a62975b0300..99c36e7f01e 100644
--- a/src/harness/tsconfig.json
+++ b/src/harness/tsconfig.json
@@ -1,9 +1,7 @@
 {
     "extends": "../tsconfig-base",
     "compilerOptions": {
-        "removeComments": false,
-        "outFile": "../../built/local/run.js",
-        "declaration": false,
+        "outFile": "../built/local/harness.js",
         "types": [
             "node", "mocha", "chai"
         ],
@@ -12,138 +10,16 @@
             "scripthost"
         ]
     },
+    "references": [
+        { "path": "../core" },
+        { "path": "../parser" },
+        { "path": "../compiler" },
+        { "path": "../services" },
+        { "path": "../server" },
+        { "path": "../typingsInstallerCore" },
+    ],
+
     "files": [
-        "../compiler/types.ts",
-        "../compiler/performance.ts",
-        "../compiler/core.ts",
-        "../compiler/sys.ts",
-        "../compiler/diagnosticInformationMap.generated.ts",
-        "../compiler/scanner.ts",
-        "../compiler/utilities.ts",
-        "../compiler/parser.ts",
-        "../compiler/binder.ts",
-        "../compiler/symbolWalker.ts",
-        "../compiler/moduleNameResolver.ts",
-        "../compiler/checker.ts",
-        "../compiler/factory.ts",
-        "../compiler/visitor.ts",
-        "../compiler/transformers/utilities.ts",
-        "../compiler/transformers/destructuring.ts",
-        "../compiler/transformers/ts.ts",
-        "../compiler/transformers/es2017.ts",
-        "../compiler/transformers/esnext.ts",
-        "../compiler/transformers/jsx.ts",
-        "../compiler/transformers/es2016.ts",
-        "../compiler/transformers/es2015.ts",
-        "../compiler/transformers/es5.ts",
-        "../compiler/transformers/generators.ts",
-        "../compiler/transformers/module/module.ts",
-        "../compiler/transformers/module/system.ts",
-        "../compiler/transformers/module/es2015.ts",
-        "../compiler/transformers/declarations/diagnostics.ts",
-        "../compiler/transformers/declarations.ts",
-        "../compiler/transformer.ts",
-        "../compiler/sourcemap.ts",
-        "../compiler/comments.ts",
-        "../compiler/emitter.ts",
-        "../compiler/watchUtilities.ts",
-        "../compiler/program.ts",
-        "../compiler/builderState.ts",
-        "../compiler/builder.ts",
-        "../compiler/resolutionCache.ts",
-        "../compiler/moduleSpecifiers.ts",
-        "../compiler/watch.ts",
-        "../compiler/tsbuild.ts",
-        "../compiler/commandLineParser.ts",
-
-        "../services/types.ts",
-        "../services/utilities.ts",
-        "../services/classifier.ts",
-        "../services/pathCompletions.ts",
-        "../services/completions.ts",
-        "../services/documentHighlights.ts",
-        "../services/documentRegistry.ts",
-        "../services/importTracker.ts",
-        "../services/findAllReferences.ts",
-        "../services/getEditsForFileRename.ts",
-        "../services/goToDefinition.ts",
-        "../services/jsDoc.ts",
-        "../services/semver.ts",
-        "../services/jsTyping.ts",
-        "../services/navigateTo.ts",
-        "../services/navigationBar.ts",
-        "../services/organizeImports.ts",
-        "../services/getEditsForFileRename.ts",
-        "../services/outliningElementsCollector.ts",
-        "../services/patternMatcher.ts",
-        "../services/preProcess.ts",
-        "../services/rename.ts",
-        "../services/signatureHelp.ts",
-        "../services/suggestionDiagnostics.ts",
-        "../services/symbolDisplay.ts",
-        "../services/transpile.ts",
-        "../services/formatting/formattingContext.ts",
-        "../services/formatting/formattingScanner.ts",
-        "../services/formatting/rule.ts",
-        "../services/formatting/rules.ts",
-        "../services/formatting/rulesMap.ts",
-        "../services/formatting/formatting.ts",
-        "../services/formatting/smartIndenter.ts",
-        "../services/textChanges.ts",
-        "../services/codeFixProvider.ts",
-        "../services/refactorProvider.ts",
-        "../services/codefixes/addMissingInvocationForDecorator.ts",
-        "../services/codefixes/annotateWithTypeFromJSDoc.ts",
-        "../services/codefixes/convertFunctionToEs6Class.ts",
-        "../services/codefixes/convertToEs6Module.ts",
-        "../services/codefixes/correctQualifiedNameToIndexedAccessType.ts",
-        "../services/codefixes/fixClassIncorrectlyImplementsInterface.ts",
-        "../services/codefixes/importFixes.ts",
-        "../services/codefixes/fixSpelling.ts",
-        "../services/codefixes/fixAddMissingMember.ts",
-        "../services/codefixes/fixCannotFindModule.ts",
-        "../services/codefixes/fixClassDoesntImplementInheritedAbstractMember.ts",
-        "../services/codefixes/fixClassSuperMustPrecedeThisAccess.ts",
-        "../services/codefixes/fixConstructorForDerivedNeedSuperCall.ts",
-        "../services/codefixes/fixExtendsInterfaceBecomesImplements.ts",
-        "../services/codefixes/fixForgottenThisPropertyAccess.ts",
-        "../services/codefixes/fixUnusedIdentifier.ts",
-        "../services/codefixes/fixUnreachableCode.ts",
-        "../services/codefixes/fixUnusedLabel.ts",
-        "../services/codefixes/fixJSDocTypes.ts",
-        "../services/codefixes/fixAwaitInSyncFunction.ts",
-        "../services/codefixes/disableJsDiagnostics.ts",
-        "../services/codefixes/helpers.ts",
-        "../services/codefixes/inferFromUsage.ts",
-        "../services/codefixes/fixInvalidImportSyntax.ts",
-        "../services/codefixes/fixStrictClassInitialization.ts",
-        "../services/codefixes/requireInTs.ts",
-        "../services/codefixes/useDefaultImport.ts",
-        "../services/codefixes/fixAddModuleReferTypeMissingTypeof.ts",
-        "../services/codefixes/convertToMappedObjectType.ts",
-        "../services/refactors/convertImport.ts",
-        "../services/refactors/extractSymbol.ts",
-        "../services/refactors/generateGetAccessorAndSetAccessor.ts",
-        "../services/refactors/moveToNewFile.ts",
-        "../services/sourcemaps.ts",
-        "../services/services.ts",
-        "../services/breakpoints.ts",
-        "../services/transform.ts",
-        "../services/shims.ts",
-
-        "../server/typingsInstaller/typingsInstaller.ts",
-
-        "../server/types.ts",
-        "../server/shared.ts",
-        "../server/utilities.ts",
-        "../server/protocol.ts",
-        "../server/scriptInfo.ts",
-        "../server/typingsCache.ts",
-        "../server/project.ts",
-        "../server/editorServices.ts",
-        "../server/session.ts",
-        "../server/scriptVersionCache.ts",
-
         "collections.ts",
         "utils.ts",
         "documents.ts",
@@ -152,25 +28,15 @@
         "compiler.ts",
         "evaluator.ts",
         "fakes.ts",
+        "client.ts",
 
-        "sourceMapRecorder.ts",
         "runnerbase.ts",
+        "sourceMapRecorder.ts",
         "harness.ts",
         "harnessLanguageService.ts",
         "virtualFileSystemWithWatch.ts",
-        "fourslashRunner.ts",
         "fourslash.ts",
         "typeWriter.ts",
-        "compilerRunner.ts",
-        "projectsRunner.ts",
-        "loggedIO.ts",
-        "rwcRunner.ts",
-        "externalCompileRunner.ts",
-        "test262Runner.ts",
-        "parallel/host.ts",
-        "parallel/worker.ts",
-        "parallel/shared.ts",
-        "runner.ts"
-    ],
-    "include": ["unittests/**/*.ts"]
+        "loggedIO.ts"
+    ]
 }
diff --git a/src/harness/virtualFileSystemWithWatch.ts b/src/harness/virtualFileSystemWithWatch.ts
index 484d3302c1b..467a3474100 100644
--- a/src/harness/virtualFileSystemWithWatch.ts
+++ b/src/harness/virtualFileSystemWithWatch.ts
@@ -1,5 +1,3 @@
-/// <reference path="harness.ts" />
-
 namespace ts.TestFSWithWatch {
     export const libFile: File = {
         path: "/a/lib/lib.d.ts",
diff --git a/src/compiler/commandLineParser.ts b/src/parser/commandLineParser.ts
similarity index 100%
rename from src/compiler/commandLineParser.ts
rename to src/parser/commandLineParser.ts
diff --git a/src/parser/diagnosticInformationMap.generated.ts b/src/parser/diagnosticInformationMap.generated.ts
new file mode 100644
index 00000000000..55d7e087b8a
--- /dev/null
+++ b/src/parser/diagnosticInformationMap.generated.ts
@@ -0,0 +1,1107 @@
+// <auto-generated />
+// generated from './diagnosticInformationMap.generated.ts' by '../../scripts/processDiagnosticMessages.js'
+/* @internal */
+namespace ts {
+    function diag(code: number, category: DiagnosticCategory, key: string, message: string, reportsUnnecessary?: {}): DiagnosticMessage {
+        return { code, category, key, message, reportsUnnecessary };
+    }
+    // tslint:disable-next-line variable-name
+    export const Diagnostics = {
+        Unterminated_string_literal: diag(1002, DiagnosticCategory.Error, "Unterminated_string_literal_1002", "Unterminated string literal."),
+        Identifier_expected: diag(1003, DiagnosticCategory.Error, "Identifier_expected_1003", "Identifier expected."),
+        _0_expected: diag(1005, DiagnosticCategory.Error, "_0_expected_1005", "'{0}' expected."),
+        A_file_cannot_have_a_reference_to_itself: diag(1006, DiagnosticCategory.Error, "A_file_cannot_have_a_reference_to_itself_1006", "A file cannot have a reference to itself."),
+        Trailing_comma_not_allowed: diag(1009, DiagnosticCategory.Error, "Trailing_comma_not_allowed_1009", "Trailing comma not allowed."),
+        Asterisk_Slash_expected: diag(1010, DiagnosticCategory.Error, "Asterisk_Slash_expected_1010", "'*/' expected."),
+        An_element_access_expression_should_take_an_argument: diag(1011, DiagnosticCategory.Error, "An_element_access_expression_should_take_an_argument_1011", "An element access expression should take an argument."),
+        Unexpected_token: diag(1012, DiagnosticCategory.Error, "Unexpected_token_1012", "Unexpected token."),
+        A_rest_parameter_or_binding_pattern_may_not_have_a_trailing_comma: diag(1013, DiagnosticCategory.Error, "A_rest_parameter_or_binding_pattern_may_not_have_a_trailing_comma_1013", "A rest parameter or binding pattern may not have a trailing comma."),
+        A_rest_parameter_must_be_last_in_a_parameter_list: diag(1014, DiagnosticCategory.Error, "A_rest_parameter_must_be_last_in_a_parameter_list_1014", "A rest parameter must be last in a parameter list."),
+        Parameter_cannot_have_question_mark_and_initializer: diag(1015, DiagnosticCategory.Error, "Parameter_cannot_have_question_mark_and_initializer_1015", "Parameter cannot have question mark and initializer."),
+        A_required_parameter_cannot_follow_an_optional_parameter: diag(1016, DiagnosticCategory.Error, "A_required_parameter_cannot_follow_an_optional_parameter_1016", "A required parameter cannot follow an optional parameter."),
+        An_index_signature_cannot_have_a_rest_parameter: diag(1017, DiagnosticCategory.Error, "An_index_signature_cannot_have_a_rest_parameter_1017", "An index signature cannot have a rest parameter."),
+        An_index_signature_parameter_cannot_have_an_accessibility_modifier: diag(1018, DiagnosticCategory.Error, "An_index_signature_parameter_cannot_have_an_accessibility_modifier_1018", "An index signature parameter cannot have an accessibility modifier."),
+        An_index_signature_parameter_cannot_have_a_question_mark: diag(1019, DiagnosticCategory.Error, "An_index_signature_parameter_cannot_have_a_question_mark_1019", "An index signature parameter cannot have a question mark."),
+        An_index_signature_parameter_cannot_have_an_initializer: diag(1020, DiagnosticCategory.Error, "An_index_signature_parameter_cannot_have_an_initializer_1020", "An index signature parameter cannot have an initializer."),
+        An_index_signature_must_have_a_type_annotation: diag(1021, DiagnosticCategory.Error, "An_index_signature_must_have_a_type_annotation_1021", "An index signature must have a type annotation."),
+        An_index_signature_parameter_must_have_a_type_annotation: diag(1022, DiagnosticCategory.Error, "An_index_signature_parameter_must_have_a_type_annotation_1022", "An index signature parameter must have a type annotation."),
+        An_index_signature_parameter_type_must_be_string_or_number: diag(1023, DiagnosticCategory.Error, "An_index_signature_parameter_type_must_be_string_or_number_1023", "An index signature parameter type must be 'string' or 'number'."),
+        readonly_modifier_can_only_appear_on_a_property_declaration_or_index_signature: diag(1024, DiagnosticCategory.Error, "readonly_modifier_can_only_appear_on_a_property_declaration_or_index_signature_1024", "'readonly' modifier can only appear on a property declaration or index signature."),
+        Accessibility_modifier_already_seen: diag(1028, DiagnosticCategory.Error, "Accessibility_modifier_already_seen_1028", "Accessibility modifier already seen."),
+        _0_modifier_must_precede_1_modifier: diag(1029, DiagnosticCategory.Error, "_0_modifier_must_precede_1_modifier_1029", "'{0}' modifier must precede '{1}' modifier."),
+        _0_modifier_already_seen: diag(1030, DiagnosticCategory.Error, "_0_modifier_already_seen_1030", "'{0}' modifier already seen."),
+        _0_modifier_cannot_appear_on_a_class_element: diag(1031, DiagnosticCategory.Error, "_0_modifier_cannot_appear_on_a_class_element_1031", "'{0}' modifier cannot appear on a class element."),
+        super_must_be_followed_by_an_argument_list_or_member_access: diag(1034, DiagnosticCategory.Error, "super_must_be_followed_by_an_argument_list_or_member_access_1034", "'super' must be followed by an argument list or member access."),
+        Only_ambient_modules_can_use_quoted_names: diag(1035, DiagnosticCategory.Error, "Only_ambient_modules_can_use_quoted_names_1035", "Only ambient modules can use quoted names."),
+        Statements_are_not_allowed_in_ambient_contexts: diag(1036, DiagnosticCategory.Error, "Statements_are_not_allowed_in_ambient_contexts_1036", "Statements are not allowed in ambient contexts."),
+        A_declare_modifier_cannot_be_used_in_an_already_ambient_context: diag(1038, DiagnosticCategory.Error, "A_declare_modifier_cannot_be_used_in_an_already_ambient_context_1038", "A 'declare' modifier cannot be used in an already ambient context."),
+        Initializers_are_not_allowed_in_ambient_contexts: diag(1039, DiagnosticCategory.Error, "Initializers_are_not_allowed_in_ambient_contexts_1039", "Initializers are not allowed in ambient contexts."),
+        _0_modifier_cannot_be_used_in_an_ambient_context: diag(1040, DiagnosticCategory.Error, "_0_modifier_cannot_be_used_in_an_ambient_context_1040", "'{0}' modifier cannot be used in an ambient context."),
+        _0_modifier_cannot_be_used_with_a_class_declaration: diag(1041, DiagnosticCategory.Error, "_0_modifier_cannot_be_used_with_a_class_declaration_1041", "'{0}' modifier cannot be used with a class declaration."),
+        _0_modifier_cannot_be_used_here: diag(1042, DiagnosticCategory.Error, "_0_modifier_cannot_be_used_here_1042", "'{0}' modifier cannot be used here."),
+        _0_modifier_cannot_appear_on_a_data_property: diag(1043, DiagnosticCategory.Error, "_0_modifier_cannot_appear_on_a_data_property_1043", "'{0}' modifier cannot appear on a data property."),
+        _0_modifier_cannot_appear_on_a_module_or_namespace_element: diag(1044, DiagnosticCategory.Error, "_0_modifier_cannot_appear_on_a_module_or_namespace_element_1044", "'{0}' modifier cannot appear on a module or namespace element."),
+        A_0_modifier_cannot_be_used_with_an_interface_declaration: diag(1045, DiagnosticCategory.Error, "A_0_modifier_cannot_be_used_with_an_interface_declaration_1045", "A '{0}' modifier cannot be used with an interface declaration."),
+        A_declare_modifier_is_required_for_a_top_level_declaration_in_a_d_ts_file: diag(1046, DiagnosticCategory.Error, "A_declare_modifier_is_required_for_a_top_level_declaration_in_a_d_ts_file_1046", "A 'declare' modifier is required for a top level declaration in a .d.ts file."),
+        A_rest_parameter_cannot_be_optional: diag(1047, DiagnosticCategory.Error, "A_rest_parameter_cannot_be_optional_1047", "A rest parameter cannot be optional."),
+        A_rest_parameter_cannot_have_an_initializer: diag(1048, DiagnosticCategory.Error, "A_rest_parameter_cannot_have_an_initializer_1048", "A rest parameter cannot have an initializer."),
+        A_set_accessor_must_have_exactly_one_parameter: diag(1049, DiagnosticCategory.Error, "A_set_accessor_must_have_exactly_one_parameter_1049", "A 'set' accessor must have exactly one parameter."),
+        A_set_accessor_cannot_have_an_optional_parameter: diag(1051, DiagnosticCategory.Error, "A_set_accessor_cannot_have_an_optional_parameter_1051", "A 'set' accessor cannot have an optional parameter."),
+        A_set_accessor_parameter_cannot_have_an_initializer: diag(1052, DiagnosticCategory.Error, "A_set_accessor_parameter_cannot_have_an_initializer_1052", "A 'set' accessor parameter cannot have an initializer."),
+        A_set_accessor_cannot_have_rest_parameter: diag(1053, DiagnosticCategory.Error, "A_set_accessor_cannot_have_rest_parameter_1053", "A 'set' accessor cannot have rest parameter."),
+        A_get_accessor_cannot_have_parameters: diag(1054, DiagnosticCategory.Error, "A_get_accessor_cannot_have_parameters_1054", "A 'get' accessor cannot have parameters."),
+        Type_0_is_not_a_valid_async_function_return_type_in_ES5_SlashES3_because_it_does_not_refer_to_a_Promise_compatible_constructor_value: diag(1055, DiagnosticCategory.Error, "Type_0_is_not_a_valid_async_function_return_type_in_ES5_SlashES3_because_it_does_not_refer_to_a_Prom_1055", "Type '{0}' is not a valid async function return type in ES5/ES3 because it does not refer to a Promise-compatible constructor value."),
+        Accessors_are_only_available_when_targeting_ECMAScript_5_and_higher: diag(1056, DiagnosticCategory.Error, "Accessors_are_only_available_when_targeting_ECMAScript_5_and_higher_1056", "Accessors are only available when targeting ECMAScript 5 and higher."),
+        An_async_function_or_method_must_have_a_valid_awaitable_return_type: diag(1057, DiagnosticCategory.Error, "An_async_function_or_method_must_have_a_valid_awaitable_return_type_1057", "An async function or method must have a valid awaitable return type."),
+        The_return_type_of_an_async_function_must_either_be_a_valid_promise_or_must_not_contain_a_callable_then_member: diag(1058, DiagnosticCategory.Error, "The_return_type_of_an_async_function_must_either_be_a_valid_promise_or_must_not_contain_a_callable_t_1058", "The return type of an async function must either be a valid promise or must not contain a callable 'then' member."),
+        A_promise_must_have_a_then_method: diag(1059, DiagnosticCategory.Error, "A_promise_must_have_a_then_method_1059", "A promise must have a 'then' method."),
+        The_first_parameter_of_the_then_method_of_a_promise_must_be_a_callback: diag(1060, DiagnosticCategory.Error, "The_first_parameter_of_the_then_method_of_a_promise_must_be_a_callback_1060", "The first parameter of the 'then' method of a promise must be a callback."),
+        Enum_member_must_have_initializer: diag(1061, DiagnosticCategory.Error, "Enum_member_must_have_initializer_1061", "Enum member must have initializer."),
+        Type_is_referenced_directly_or_indirectly_in_the_fulfillment_callback_of_its_own_then_method: diag(1062, DiagnosticCategory.Error, "Type_is_referenced_directly_or_indirectly_in_the_fulfillment_callback_of_its_own_then_method_1062", "Type is referenced directly or indirectly in the fulfillment callback of its own 'then' method."),
+        An_export_assignment_cannot_be_used_in_a_namespace: diag(1063, DiagnosticCategory.Error, "An_export_assignment_cannot_be_used_in_a_namespace_1063", "An export assignment cannot be used in a namespace."),
+        The_return_type_of_an_async_function_or_method_must_be_the_global_Promise_T_type: diag(1064, DiagnosticCategory.Error, "The_return_type_of_an_async_function_or_method_must_be_the_global_Promise_T_type_1064", "The return type of an async function or method must be the global Promise<T> type."),
+        In_ambient_enum_declarations_member_initializer_must_be_constant_expression: diag(1066, DiagnosticCategory.Error, "In_ambient_enum_declarations_member_initializer_must_be_constant_expression_1066", "In ambient enum declarations member initializer must be constant expression."),
+        Unexpected_token_A_constructor_method_accessor_or_property_was_expected: diag(1068, DiagnosticCategory.Error, "Unexpected_token_A_constructor_method_accessor_or_property_was_expected_1068", "Unexpected token. A constructor, method, accessor, or property was expected."),
+        Unexpected_token_A_type_parameter_name_was_expected_without_curly_braces: diag(1069, DiagnosticCategory.Error, "Unexpected_token_A_type_parameter_name_was_expected_without_curly_braces_1069", "Unexpected token. A type parameter name was expected without curly braces."),
+        _0_modifier_cannot_appear_on_a_type_member: diag(1070, DiagnosticCategory.Error, "_0_modifier_cannot_appear_on_a_type_member_1070", "'{0}' modifier cannot appear on a type member."),
+        _0_modifier_cannot_appear_on_an_index_signature: diag(1071, DiagnosticCategory.Error, "_0_modifier_cannot_appear_on_an_index_signature_1071", "'{0}' modifier cannot appear on an index signature."),
+        A_0_modifier_cannot_be_used_with_an_import_declaration: diag(1079, DiagnosticCategory.Error, "A_0_modifier_cannot_be_used_with_an_import_declaration_1079", "A '{0}' modifier cannot be used with an import declaration."),
+        Invalid_reference_directive_syntax: diag(1084, DiagnosticCategory.Error, "Invalid_reference_directive_syntax_1084", "Invalid 'reference' directive syntax."),
+        Octal_literals_are_not_available_when_targeting_ECMAScript_5_and_higher_Use_the_syntax_0: diag(1085, DiagnosticCategory.Error, "Octal_literals_are_not_available_when_targeting_ECMAScript_5_and_higher_Use_the_syntax_0_1085", "Octal literals are not available when targeting ECMAScript 5 and higher. Use the syntax '{0}'."),
+        An_accessor_cannot_be_declared_in_an_ambient_context: diag(1086, DiagnosticCategory.Error, "An_accessor_cannot_be_declared_in_an_ambient_context_1086", "An accessor cannot be declared in an ambient context."),
+        _0_modifier_cannot_appear_on_a_constructor_declaration: diag(1089, DiagnosticCategory.Error, "_0_modifier_cannot_appear_on_a_constructor_declaration_1089", "'{0}' modifier cannot appear on a constructor declaration."),
+        _0_modifier_cannot_appear_on_a_parameter: diag(1090, DiagnosticCategory.Error, "_0_modifier_cannot_appear_on_a_parameter_1090", "'{0}' modifier cannot appear on a parameter."),
+        Only_a_single_variable_declaration_is_allowed_in_a_for_in_statement: diag(1091, DiagnosticCategory.Error, "Only_a_single_variable_declaration_is_allowed_in_a_for_in_statement_1091", "Only a single variable declaration is allowed in a 'for...in' statement."),
+        Type_parameters_cannot_appear_on_a_constructor_declaration: diag(1092, DiagnosticCategory.Error, "Type_parameters_cannot_appear_on_a_constructor_declaration_1092", "Type parameters cannot appear on a constructor declaration."),
+        Type_annotation_cannot_appear_on_a_constructor_declaration: diag(1093, DiagnosticCategory.Error, "Type_annotation_cannot_appear_on_a_constructor_declaration_1093", "Type annotation cannot appear on a constructor declaration."),
+        An_accessor_cannot_have_type_parameters: diag(1094, DiagnosticCategory.Error, "An_accessor_cannot_have_type_parameters_1094", "An accessor cannot have type parameters."),
+        A_set_accessor_cannot_have_a_return_type_annotation: diag(1095, DiagnosticCategory.Error, "A_set_accessor_cannot_have_a_return_type_annotation_1095", "A 'set' accessor cannot have a return type annotation."),
+        An_index_signature_must_have_exactly_one_parameter: diag(1096, DiagnosticCategory.Error, "An_index_signature_must_have_exactly_one_parameter_1096", "An index signature must have exactly one parameter."),
+        _0_list_cannot_be_empty: diag(1097, DiagnosticCategory.Error, "_0_list_cannot_be_empty_1097", "'{0}' list cannot be empty."),
+        Type_parameter_list_cannot_be_empty: diag(1098, DiagnosticCategory.Error, "Type_parameter_list_cannot_be_empty_1098", "Type parameter list cannot be empty."),
+        Type_argument_list_cannot_be_empty: diag(1099, DiagnosticCategory.Error, "Type_argument_list_cannot_be_empty_1099", "Type argument list cannot be empty."),
+        Invalid_use_of_0_in_strict_mode: diag(1100, DiagnosticCategory.Error, "Invalid_use_of_0_in_strict_mode_1100", "Invalid use of '{0}' in strict mode."),
+        with_statements_are_not_allowed_in_strict_mode: diag(1101, DiagnosticCategory.Error, "with_statements_are_not_allowed_in_strict_mode_1101", "'with' statements are not allowed in strict mode."),
+        delete_cannot_be_called_on_an_identifier_in_strict_mode: diag(1102, DiagnosticCategory.Error, "delete_cannot_be_called_on_an_identifier_in_strict_mode_1102", "'delete' cannot be called on an identifier in strict mode."),
+        A_for_await_of_statement_is_only_allowed_within_an_async_function_or_async_generator: diag(1103, DiagnosticCategory.Error, "A_for_await_of_statement_is_only_allowed_within_an_async_function_or_async_generator_1103", "A 'for-await-of' statement is only allowed within an async function or async generator."),
+        A_continue_statement_can_only_be_used_within_an_enclosing_iteration_statement: diag(1104, DiagnosticCategory.Error, "A_continue_statement_can_only_be_used_within_an_enclosing_iteration_statement_1104", "A 'continue' statement can only be used within an enclosing iteration statement."),
+        A_break_statement_can_only_be_used_within_an_enclosing_iteration_or_switch_statement: diag(1105, DiagnosticCategory.Error, "A_break_statement_can_only_be_used_within_an_enclosing_iteration_or_switch_statement_1105", "A 'break' statement can only be used within an enclosing iteration or switch statement."),
+        Jump_target_cannot_cross_function_boundary: diag(1107, DiagnosticCategory.Error, "Jump_target_cannot_cross_function_boundary_1107", "Jump target cannot cross function boundary."),
+        A_return_statement_can_only_be_used_within_a_function_body: diag(1108, DiagnosticCategory.Error, "A_return_statement_can_only_be_used_within_a_function_body_1108", "A 'return' statement can only be used within a function body."),
+        Expression_expected: diag(1109, DiagnosticCategory.Error, "Expression_expected_1109", "Expression expected."),
+        Type_expected: diag(1110, DiagnosticCategory.Error, "Type_expected_1110", "Type expected."),
+        A_default_clause_cannot_appear_more_than_once_in_a_switch_statement: diag(1113, DiagnosticCategory.Error, "A_default_clause_cannot_appear_more_than_once_in_a_switch_statement_1113", "A 'default' clause cannot appear more than once in a 'switch' statement."),
+        Duplicate_label_0: diag(1114, DiagnosticCategory.Error, "Duplicate_label_0_1114", "Duplicate label '{0}'."),
+        A_continue_statement_can_only_jump_to_a_label_of_an_enclosing_iteration_statement: diag(1115, DiagnosticCategory.Error, "A_continue_statement_can_only_jump_to_a_label_of_an_enclosing_iteration_statement_1115", "A 'continue' statement can only jump to a label of an enclosing iteration statement."),
+        A_break_statement_can_only_jump_to_a_label_of_an_enclosing_statement: diag(1116, DiagnosticCategory.Error, "A_break_statement_can_only_jump_to_a_label_of_an_enclosing_statement_1116", "A 'break' statement can only jump to a label of an enclosing statement."),
+        An_object_literal_cannot_have_multiple_properties_with_the_same_name_in_strict_mode: diag(1117, DiagnosticCategory.Error, "An_object_literal_cannot_have_multiple_properties_with_the_same_name_in_strict_mode_1117", "An object literal cannot have multiple properties with the same name in strict mode."),
+        An_object_literal_cannot_have_multiple_get_Slashset_accessors_with_the_same_name: diag(1118, DiagnosticCategory.Error, "An_object_literal_cannot_have_multiple_get_Slashset_accessors_with_the_same_name_1118", "An object literal cannot have multiple get/set accessors with the same name."),
+        An_object_literal_cannot_have_property_and_accessor_with_the_same_name: diag(1119, DiagnosticCategory.Error, "An_object_literal_cannot_have_property_and_accessor_with_the_same_name_1119", "An object literal cannot have property and accessor with the same name."),
+        An_export_assignment_cannot_have_modifiers: diag(1120, DiagnosticCategory.Error, "An_export_assignment_cannot_have_modifiers_1120", "An export assignment cannot have modifiers."),
+        Octal_literals_are_not_allowed_in_strict_mode: diag(1121, DiagnosticCategory.Error, "Octal_literals_are_not_allowed_in_strict_mode_1121", "Octal literals are not allowed in strict mode."),
+        A_tuple_type_element_list_cannot_be_empty: diag(1122, DiagnosticCategory.Error, "A_tuple_type_element_list_cannot_be_empty_1122", "A tuple type element list cannot be empty."),
+        Variable_declaration_list_cannot_be_empty: diag(1123, DiagnosticCategory.Error, "Variable_declaration_list_cannot_be_empty_1123", "Variable declaration list cannot be empty."),
+        Digit_expected: diag(1124, DiagnosticCategory.Error, "Digit_expected_1124", "Digit expected."),
+        Hexadecimal_digit_expected: diag(1125, DiagnosticCategory.Error, "Hexadecimal_digit_expected_1125", "Hexadecimal digit expected."),
+        Unexpected_end_of_text: diag(1126, DiagnosticCategory.Error, "Unexpected_end_of_text_1126", "Unexpected end of text."),
+        Invalid_character: diag(1127, DiagnosticCategory.Error, "Invalid_character_1127", "Invalid character."),
+        Declaration_or_statement_expected: diag(1128, DiagnosticCategory.Error, "Declaration_or_statement_expected_1128", "Declaration or statement expected."),
+        Statement_expected: diag(1129, DiagnosticCategory.Error, "Statement_expected_1129", "Statement expected."),
+        case_or_default_expected: diag(1130, DiagnosticCategory.Error, "case_or_default_expected_1130", "'case' or 'default' expected."),
+        Property_or_signature_expected: diag(1131, DiagnosticCategory.Error, "Property_or_signature_expected_1131", "Property or signature expected."),
+        Enum_member_expected: diag(1132, DiagnosticCategory.Error, "Enum_member_expected_1132", "Enum member expected."),
+        Variable_declaration_expected: diag(1134, DiagnosticCategory.Error, "Variable_declaration_expected_1134", "Variable declaration expected."),
+        Argument_expression_expected: diag(1135, DiagnosticCategory.Error, "Argument_expression_expected_1135", "Argument expression expected."),
+        Property_assignment_expected: diag(1136, DiagnosticCategory.Error, "Property_assignment_expected_1136", "Property assignment expected."),
+        Expression_or_comma_expected: diag(1137, DiagnosticCategory.Error, "Expression_or_comma_expected_1137", "Expression or comma expected."),
+        Parameter_declaration_expected: diag(1138, DiagnosticCategory.Error, "Parameter_declaration_expected_1138", "Parameter declaration expected."),
+        Type_parameter_declaration_expected: diag(1139, DiagnosticCategory.Error, "Type_parameter_declaration_expected_1139", "Type parameter declaration expected."),
+        Type_argument_expected: diag(1140, DiagnosticCategory.Error, "Type_argument_expected_1140", "Type argument expected."),
+        String_literal_expected: diag(1141, DiagnosticCategory.Error, "String_literal_expected_1141", "String literal expected."),
+        Line_break_not_permitted_here: diag(1142, DiagnosticCategory.Error, "Line_break_not_permitted_here_1142", "Line break not permitted here."),
+        or_expected: diag(1144, DiagnosticCategory.Error, "or_expected_1144", "'{' or ';' expected."),
+        Declaration_expected: diag(1146, DiagnosticCategory.Error, "Declaration_expected_1146", "Declaration expected."),
+        Import_declarations_in_a_namespace_cannot_reference_a_module: diag(1147, DiagnosticCategory.Error, "Import_declarations_in_a_namespace_cannot_reference_a_module_1147", "Import declarations in a namespace cannot reference a module."),
+        Cannot_use_imports_exports_or_module_augmentations_when_module_is_none: diag(1148, DiagnosticCategory.Error, "Cannot_use_imports_exports_or_module_augmentations_when_module_is_none_1148", "Cannot use imports, exports, or module augmentations when '--module' is 'none'."),
+        File_name_0_differs_from_already_included_file_name_1_only_in_casing: diag(1149, DiagnosticCategory.Error, "File_name_0_differs_from_already_included_file_name_1_only_in_casing_1149", "File name '{0}' differs from already included file name '{1}' only in casing."),
+        new_T_cannot_be_used_to_create_an_array_Use_new_Array_T_instead: diag(1150, DiagnosticCategory.Error, "new_T_cannot_be_used_to_create_an_array_Use_new_Array_T_instead_1150", "'new T[]' cannot be used to create an array. Use 'new Array<T>()' instead."),
+        const_declarations_must_be_initialized: diag(1155, DiagnosticCategory.Error, "const_declarations_must_be_initialized_1155", "'const' declarations must be initialized."),
+        const_declarations_can_only_be_declared_inside_a_block: diag(1156, DiagnosticCategory.Error, "const_declarations_can_only_be_declared_inside_a_block_1156", "'const' declarations can only be declared inside a block."),
+        let_declarations_can_only_be_declared_inside_a_block: diag(1157, DiagnosticCategory.Error, "let_declarations_can_only_be_declared_inside_a_block_1157", "'let' declarations can only be declared inside a block."),
+        Unterminated_template_literal: diag(1160, DiagnosticCategory.Error, "Unterminated_template_literal_1160", "Unterminated template literal."),
+        Unterminated_regular_expression_literal: diag(1161, DiagnosticCategory.Error, "Unterminated_regular_expression_literal_1161", "Unterminated regular expression literal."),
+        An_object_member_cannot_be_declared_optional: diag(1162, DiagnosticCategory.Error, "An_object_member_cannot_be_declared_optional_1162", "An object member cannot be declared optional."),
+        A_yield_expression_is_only_allowed_in_a_generator_body: diag(1163, DiagnosticCategory.Error, "A_yield_expression_is_only_allowed_in_a_generator_body_1163", "A 'yield' expression is only allowed in a generator body."),
+        Computed_property_names_are_not_allowed_in_enums: diag(1164, DiagnosticCategory.Error, "Computed_property_names_are_not_allowed_in_enums_1164", "Computed property names are not allowed in enums."),
+        A_computed_property_name_in_an_ambient_context_must_refer_to_an_expression_whose_type_is_a_literal_type_or_a_unique_symbol_type: diag(1165, DiagnosticCategory.Error, "A_computed_property_name_in_an_ambient_context_must_refer_to_an_expression_whose_type_is_a_literal_t_1165", "A computed property name in an ambient context must refer to an expression whose type is a literal type or a 'unique symbol' type."),
+        A_computed_property_name_in_a_class_property_declaration_must_refer_to_an_expression_whose_type_is_a_literal_type_or_a_unique_symbol_type: diag(1166, DiagnosticCategory.Error, "A_computed_property_name_in_a_class_property_declaration_must_refer_to_an_expression_whose_type_is_a_1166", "A computed property name in a class property declaration must refer to an expression whose type is a literal type or a 'unique symbol' type."),
+        A_computed_property_name_in_a_method_overload_must_refer_to_an_expression_whose_type_is_a_literal_type_or_a_unique_symbol_type: diag(1168, DiagnosticCategory.Error, "A_computed_property_name_in_a_method_overload_must_refer_to_an_expression_whose_type_is_a_literal_ty_1168", "A computed property name in a method overload must refer to an expression whose type is a literal type or a 'unique symbol' type."),
+        A_computed_property_name_in_an_interface_must_refer_to_an_expression_whose_type_is_a_literal_type_or_a_unique_symbol_type: diag(1169, DiagnosticCategory.Error, "A_computed_property_name_in_an_interface_must_refer_to_an_expression_whose_type_is_a_literal_type_or_1169", "A computed property name in an interface must refer to an expression whose type is a literal type or a 'unique symbol' type."),
+        A_computed_property_name_in_a_type_literal_must_refer_to_an_expression_whose_type_is_a_literal_type_or_a_unique_symbol_type: diag(1170, DiagnosticCategory.Error, "A_computed_property_name_in_a_type_literal_must_refer_to_an_expression_whose_type_is_a_literal_type__1170", "A computed property name in a type literal must refer to an expression whose type is a literal type or a 'unique symbol' type."),
+        A_comma_expression_is_not_allowed_in_a_computed_property_name: diag(1171, DiagnosticCategory.Error, "A_comma_expression_is_not_allowed_in_a_computed_property_name_1171", "A comma expression is not allowed in a computed property name."),
+        extends_clause_already_seen: diag(1172, DiagnosticCategory.Error, "extends_clause_already_seen_1172", "'extends' clause already seen."),
+        extends_clause_must_precede_implements_clause: diag(1173, DiagnosticCategory.Error, "extends_clause_must_precede_implements_clause_1173", "'extends' clause must precede 'implements' clause."),
+        Classes_can_only_extend_a_single_class: diag(1174, DiagnosticCategory.Error, "Classes_can_only_extend_a_single_class_1174", "Classes can only extend a single class."),
+        implements_clause_already_seen: diag(1175, DiagnosticCategory.Error, "implements_clause_already_seen_1175", "'implements' clause already seen."),
+        Interface_declaration_cannot_have_implements_clause: diag(1176, DiagnosticCategory.Error, "Interface_declaration_cannot_have_implements_clause_1176", "Interface declaration cannot have 'implements' clause."),
+        Binary_digit_expected: diag(1177, DiagnosticCategory.Error, "Binary_digit_expected_1177", "Binary digit expected."),
+        Octal_digit_expected: diag(1178, DiagnosticCategory.Error, "Octal_digit_expected_1178", "Octal digit expected."),
+        Unexpected_token_expected: diag(1179, DiagnosticCategory.Error, "Unexpected_token_expected_1179", "Unexpected token. '{' expected."),
+        Property_destructuring_pattern_expected: diag(1180, DiagnosticCategory.Error, "Property_destructuring_pattern_expected_1180", "Property destructuring pattern expected."),
+        Array_element_destructuring_pattern_expected: diag(1181, DiagnosticCategory.Error, "Array_element_destructuring_pattern_expected_1181", "Array element destructuring pattern expected."),
+        A_destructuring_declaration_must_have_an_initializer: diag(1182, DiagnosticCategory.Error, "A_destructuring_declaration_must_have_an_initializer_1182", "A destructuring declaration must have an initializer."),
+        An_implementation_cannot_be_declared_in_ambient_contexts: diag(1183, DiagnosticCategory.Error, "An_implementation_cannot_be_declared_in_ambient_contexts_1183", "An implementation cannot be declared in ambient contexts."),
+        Modifiers_cannot_appear_here: diag(1184, DiagnosticCategory.Error, "Modifiers_cannot_appear_here_1184", "Modifiers cannot appear here."),
+        Merge_conflict_marker_encountered: diag(1185, DiagnosticCategory.Error, "Merge_conflict_marker_encountered_1185", "Merge conflict marker encountered."),
+        A_rest_element_cannot_have_an_initializer: diag(1186, DiagnosticCategory.Error, "A_rest_element_cannot_have_an_initializer_1186", "A rest element cannot have an initializer."),
+        A_parameter_property_may_not_be_declared_using_a_binding_pattern: diag(1187, DiagnosticCategory.Error, "A_parameter_property_may_not_be_declared_using_a_binding_pattern_1187", "A parameter property may not be declared using a binding pattern."),
+        Only_a_single_variable_declaration_is_allowed_in_a_for_of_statement: diag(1188, DiagnosticCategory.Error, "Only_a_single_variable_declaration_is_allowed_in_a_for_of_statement_1188", "Only a single variable declaration is allowed in a 'for...of' statement."),
+        The_variable_declaration_of_a_for_in_statement_cannot_have_an_initializer: diag(1189, DiagnosticCategory.Error, "The_variable_declaration_of_a_for_in_statement_cannot_have_an_initializer_1189", "The variable declaration of a 'for...in' statement cannot have an initializer."),
+        The_variable_declaration_of_a_for_of_statement_cannot_have_an_initializer: diag(1190, DiagnosticCategory.Error, "The_variable_declaration_of_a_for_of_statement_cannot_have_an_initializer_1190", "The variable declaration of a 'for...of' statement cannot have an initializer."),
+        An_import_declaration_cannot_have_modifiers: diag(1191, DiagnosticCategory.Error, "An_import_declaration_cannot_have_modifiers_1191", "An import declaration cannot have modifiers."),
+        Module_0_has_no_default_export: diag(1192, DiagnosticCategory.Error, "Module_0_has_no_default_export_1192", "Module '{0}' has no default export."),
+        An_export_declaration_cannot_have_modifiers: diag(1193, DiagnosticCategory.Error, "An_export_declaration_cannot_have_modifiers_1193", "An export declaration cannot have modifiers."),
+        Export_declarations_are_not_permitted_in_a_namespace: diag(1194, DiagnosticCategory.Error, "Export_declarations_are_not_permitted_in_a_namespace_1194", "Export declarations are not permitted in a namespace."),
+        Catch_clause_variable_cannot_have_a_type_annotation: diag(1196, DiagnosticCategory.Error, "Catch_clause_variable_cannot_have_a_type_annotation_1196", "Catch clause variable cannot have a type annotation."),
+        Catch_clause_variable_cannot_have_an_initializer: diag(1197, DiagnosticCategory.Error, "Catch_clause_variable_cannot_have_an_initializer_1197", "Catch clause variable cannot have an initializer."),
+        An_extended_Unicode_escape_value_must_be_between_0x0_and_0x10FFFF_inclusive: diag(1198, DiagnosticCategory.Error, "An_extended_Unicode_escape_value_must_be_between_0x0_and_0x10FFFF_inclusive_1198", "An extended Unicode escape value must be between 0x0 and 0x10FFFF inclusive."),
+        Unterminated_Unicode_escape_sequence: diag(1199, DiagnosticCategory.Error, "Unterminated_Unicode_escape_sequence_1199", "Unterminated Unicode escape sequence."),
+        Line_terminator_not_permitted_before_arrow: diag(1200, DiagnosticCategory.Error, "Line_terminator_not_permitted_before_arrow_1200", "Line terminator not permitted before arrow."),
+        Import_assignment_cannot_be_used_when_targeting_ECMAScript_modules_Consider_using_import_Asterisk_as_ns_from_mod_import_a_from_mod_import_d_from_mod_or_another_module_format_instead: diag(1202, DiagnosticCategory.Error, "Import_assignment_cannot_be_used_when_targeting_ECMAScript_modules_Consider_using_import_Asterisk_as_1202", "Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from \"mod\"', 'import {a} from \"mod\"', 'import d from \"mod\"', or another module format instead."),
+        Export_assignment_cannot_be_used_when_targeting_ECMAScript_modules_Consider_using_export_default_or_another_module_format_instead: diag(1203, DiagnosticCategory.Error, "Export_assignment_cannot_be_used_when_targeting_ECMAScript_modules_Consider_using_export_default_or__1203", "Export assignment cannot be used when targeting ECMAScript modules. Consider using 'export default' or another module format instead."),
+        Cannot_re_export_a_type_when_the_isolatedModules_flag_is_provided: diag(1205, DiagnosticCategory.Error, "Cannot_re_export_a_type_when_the_isolatedModules_flag_is_provided_1205", "Cannot re-export a type when the '--isolatedModules' flag is provided."),
+        Decorators_are_not_valid_here: diag(1206, DiagnosticCategory.Error, "Decorators_are_not_valid_here_1206", "Decorators are not valid here."),
+        Decorators_cannot_be_applied_to_multiple_get_Slashset_accessors_of_the_same_name: diag(1207, DiagnosticCategory.Error, "Decorators_cannot_be_applied_to_multiple_get_Slashset_accessors_of_the_same_name_1207", "Decorators cannot be applied to multiple get/set accessors of the same name."),
+        Cannot_compile_namespaces_when_the_isolatedModules_flag_is_provided: diag(1208, DiagnosticCategory.Error, "Cannot_compile_namespaces_when_the_isolatedModules_flag_is_provided_1208", "Cannot compile namespaces when the '--isolatedModules' flag is provided."),
+        Ambient_const_enums_are_not_allowed_when_the_isolatedModules_flag_is_provided: diag(1209, DiagnosticCategory.Error, "Ambient_const_enums_are_not_allowed_when_the_isolatedModules_flag_is_provided_1209", "Ambient const enums are not allowed when the '--isolatedModules' flag is provided."),
+        Invalid_use_of_0_Class_definitions_are_automatically_in_strict_mode: diag(1210, DiagnosticCategory.Error, "Invalid_use_of_0_Class_definitions_are_automatically_in_strict_mode_1210", "Invalid use of '{0}'. Class definitions are automatically in strict mode."),
+        A_class_declaration_without_the_default_modifier_must_have_a_name: diag(1211, DiagnosticCategory.Error, "A_class_declaration_without_the_default_modifier_must_have_a_name_1211", "A class declaration without the 'default' modifier must have a name."),
+        Identifier_expected_0_is_a_reserved_word_in_strict_mode: diag(1212, DiagnosticCategory.Error, "Identifier_expected_0_is_a_reserved_word_in_strict_mode_1212", "Identifier expected. '{0}' is a reserved word in strict mode."),
+        Identifier_expected_0_is_a_reserved_word_in_strict_mode_Class_definitions_are_automatically_in_strict_mode: diag(1213, DiagnosticCategory.Error, "Identifier_expected_0_is_a_reserved_word_in_strict_mode_Class_definitions_are_automatically_in_stric_1213", "Identifier expected. '{0}' is a reserved word in strict mode. Class definitions are automatically in strict mode."),
+        Identifier_expected_0_is_a_reserved_word_in_strict_mode_Modules_are_automatically_in_strict_mode: diag(1214, DiagnosticCategory.Error, "Identifier_expected_0_is_a_reserved_word_in_strict_mode_Modules_are_automatically_in_strict_mode_1214", "Identifier expected. '{0}' is a reserved word in strict mode. Modules are automatically in strict mode."),
+        Invalid_use_of_0_Modules_are_automatically_in_strict_mode: diag(1215, DiagnosticCategory.Error, "Invalid_use_of_0_Modules_are_automatically_in_strict_mode_1215", "Invalid use of '{0}'. Modules are automatically in strict mode."),
+        Identifier_expected_esModule_is_reserved_as_an_exported_marker_when_transforming_ECMAScript_modules: diag(1216, DiagnosticCategory.Error, "Identifier_expected_esModule_is_reserved_as_an_exported_marker_when_transforming_ECMAScript_modules_1216", "Identifier expected. '__esModule' is reserved as an exported marker when transforming ECMAScript modules."),
+        Export_assignment_is_not_supported_when_module_flag_is_system: diag(1218, DiagnosticCategory.Error, "Export_assignment_is_not_supported_when_module_flag_is_system_1218", "Export assignment is not supported when '--module' flag is 'system'."),
+        Experimental_support_for_decorators_is_a_feature_that_is_subject_to_change_in_a_future_release_Set_the_experimentalDecorators_option_to_remove_this_warning: diag(1219, DiagnosticCategory.Error, "Experimental_support_for_decorators_is_a_feature_that_is_subject_to_change_in_a_future_release_Set_t_1219", "Experimental support for decorators is a feature that is subject to change in a future release. Set the 'experimentalDecorators' option to remove this warning."),
+        Generators_are_only_available_when_targeting_ECMAScript_2015_or_higher: diag(1220, DiagnosticCategory.Error, "Generators_are_only_available_when_targeting_ECMAScript_2015_or_higher_1220", "Generators are only available when targeting ECMAScript 2015 or higher."),
+        Generators_are_not_allowed_in_an_ambient_context: diag(1221, DiagnosticCategory.Error, "Generators_are_not_allowed_in_an_ambient_context_1221", "Generators are not allowed in an ambient context."),
+        An_overload_signature_cannot_be_declared_as_a_generator: diag(1222, DiagnosticCategory.Error, "An_overload_signature_cannot_be_declared_as_a_generator_1222", "An overload signature cannot be declared as a generator."),
+        _0_tag_already_specified: diag(1223, DiagnosticCategory.Error, "_0_tag_already_specified_1223", "'{0}' tag already specified."),
+        Signature_0_must_be_a_type_predicate: diag(1224, DiagnosticCategory.Error, "Signature_0_must_be_a_type_predicate_1224", "Signature '{0}' must be a type predicate."),
+        Cannot_find_parameter_0: diag(1225, DiagnosticCategory.Error, "Cannot_find_parameter_0_1225", "Cannot find parameter '{0}'."),
+        Type_predicate_0_is_not_assignable_to_1: diag(1226, DiagnosticCategory.Error, "Type_predicate_0_is_not_assignable_to_1_1226", "Type predicate '{0}' is not assignable to '{1}'."),
+        Parameter_0_is_not_in_the_same_position_as_parameter_1: diag(1227, DiagnosticCategory.Error, "Parameter_0_is_not_in_the_same_position_as_parameter_1_1227", "Parameter '{0}' is not in the same position as parameter '{1}'."),
+        A_type_predicate_is_only_allowed_in_return_type_position_for_functions_and_methods: diag(1228, DiagnosticCategory.Error, "A_type_predicate_is_only_allowed_in_return_type_position_for_functions_and_methods_1228", "A type predicate is only allowed in return type position for functions and methods."),
+        A_type_predicate_cannot_reference_a_rest_parameter: diag(1229, DiagnosticCategory.Error, "A_type_predicate_cannot_reference_a_rest_parameter_1229", "A type predicate cannot reference a rest parameter."),
+        A_type_predicate_cannot_reference_element_0_in_a_binding_pattern: diag(1230, DiagnosticCategory.Error, "A_type_predicate_cannot_reference_element_0_in_a_binding_pattern_1230", "A type predicate cannot reference element '{0}' in a binding pattern."),
+        An_export_assignment_can_only_be_used_in_a_module: diag(1231, DiagnosticCategory.Error, "An_export_assignment_can_only_be_used_in_a_module_1231", "An export assignment can only be used in a module."),
+        An_import_declaration_can_only_be_used_in_a_namespace_or_module: diag(1232, DiagnosticCategory.Error, "An_import_declaration_can_only_be_used_in_a_namespace_or_module_1232", "An import declaration can only be used in a namespace or module."),
+        An_export_declaration_can_only_be_used_in_a_module: diag(1233, DiagnosticCategory.Error, "An_export_declaration_can_only_be_used_in_a_module_1233", "An export declaration can only be used in a module."),
+        An_ambient_module_declaration_is_only_allowed_at_the_top_level_in_a_file: diag(1234, DiagnosticCategory.Error, "An_ambient_module_declaration_is_only_allowed_at_the_top_level_in_a_file_1234", "An ambient module declaration is only allowed at the top level in a file."),
+        A_namespace_declaration_is_only_allowed_in_a_namespace_or_module: diag(1235, DiagnosticCategory.Error, "A_namespace_declaration_is_only_allowed_in_a_namespace_or_module_1235", "A namespace declaration is only allowed in a namespace or module."),
+        The_return_type_of_a_property_decorator_function_must_be_either_void_or_any: diag(1236, DiagnosticCategory.Error, "The_return_type_of_a_property_decorator_function_must_be_either_void_or_any_1236", "The return type of a property decorator function must be either 'void' or 'any'."),
+        The_return_type_of_a_parameter_decorator_function_must_be_either_void_or_any: diag(1237, DiagnosticCategory.Error, "The_return_type_of_a_parameter_decorator_function_must_be_either_void_or_any_1237", "The return type of a parameter decorator function must be either 'void' or 'any'."),
+        Unable_to_resolve_signature_of_class_decorator_when_called_as_an_expression: diag(1238, DiagnosticCategory.Error, "Unable_to_resolve_signature_of_class_decorator_when_called_as_an_expression_1238", "Unable to resolve signature of class decorator when called as an expression."),
+        Unable_to_resolve_signature_of_parameter_decorator_when_called_as_an_expression: diag(1239, DiagnosticCategory.Error, "Unable_to_resolve_signature_of_parameter_decorator_when_called_as_an_expression_1239", "Unable to resolve signature of parameter decorator when called as an expression."),
+        Unable_to_resolve_signature_of_property_decorator_when_called_as_an_expression: diag(1240, DiagnosticCategory.Error, "Unable_to_resolve_signature_of_property_decorator_when_called_as_an_expression_1240", "Unable to resolve signature of property decorator when called as an expression."),
+        Unable_to_resolve_signature_of_method_decorator_when_called_as_an_expression: diag(1241, DiagnosticCategory.Error, "Unable_to_resolve_signature_of_method_decorator_when_called_as_an_expression_1241", "Unable to resolve signature of method decorator when called as an expression."),
+        abstract_modifier_can_only_appear_on_a_class_method_or_property_declaration: diag(1242, DiagnosticCategory.Error, "abstract_modifier_can_only_appear_on_a_class_method_or_property_declaration_1242", "'abstract' modifier can only appear on a class, method, or property declaration."),
+        _0_modifier_cannot_be_used_with_1_modifier: diag(1243, DiagnosticCategory.Error, "_0_modifier_cannot_be_used_with_1_modifier_1243", "'{0}' modifier cannot be used with '{1}' modifier."),
+        Abstract_methods_can_only_appear_within_an_abstract_class: diag(1244, DiagnosticCategory.Error, "Abstract_methods_can_only_appear_within_an_abstract_class_1244", "Abstract methods can only appear within an abstract class."),
+        Method_0_cannot_have_an_implementation_because_it_is_marked_abstract: diag(1245, DiagnosticCategory.Error, "Method_0_cannot_have_an_implementation_because_it_is_marked_abstract_1245", "Method '{0}' cannot have an implementation because it is marked abstract."),
+        An_interface_property_cannot_have_an_initializer: diag(1246, DiagnosticCategory.Error, "An_interface_property_cannot_have_an_initializer_1246", "An interface property cannot have an initializer."),
+        A_type_literal_property_cannot_have_an_initializer: diag(1247, DiagnosticCategory.Error, "A_type_literal_property_cannot_have_an_initializer_1247", "A type literal property cannot have an initializer."),
+        A_class_member_cannot_have_the_0_keyword: diag(1248, DiagnosticCategory.Error, "A_class_member_cannot_have_the_0_keyword_1248", "A class member cannot have the '{0}' keyword."),
+        A_decorator_can_only_decorate_a_method_implementation_not_an_overload: diag(1249, DiagnosticCategory.Error, "A_decorator_can_only_decorate_a_method_implementation_not_an_overload_1249", "A decorator can only decorate a method implementation, not an overload."),
+        Function_declarations_are_not_allowed_inside_blocks_in_strict_mode_when_targeting_ES3_or_ES5: diag(1250, DiagnosticCategory.Error, "Function_declarations_are_not_allowed_inside_blocks_in_strict_mode_when_targeting_ES3_or_ES5_1250", "Function declarations are not allowed inside blocks in strict mode when targeting 'ES3' or 'ES5'."),
+        Function_declarations_are_not_allowed_inside_blocks_in_strict_mode_when_targeting_ES3_or_ES5_Class_definitions_are_automatically_in_strict_mode: diag(1251, DiagnosticCategory.Error, "Function_declarations_are_not_allowed_inside_blocks_in_strict_mode_when_targeting_ES3_or_ES5_Class_d_1251", "Function declarations are not allowed inside blocks in strict mode when targeting 'ES3' or 'ES5'. Class definitions are automatically in strict mode."),
+        Function_declarations_are_not_allowed_inside_blocks_in_strict_mode_when_targeting_ES3_or_ES5_Modules_are_automatically_in_strict_mode: diag(1252, DiagnosticCategory.Error, "Function_declarations_are_not_allowed_inside_blocks_in_strict_mode_when_targeting_ES3_or_ES5_Modules_1252", "Function declarations are not allowed inside blocks in strict mode when targeting 'ES3' or 'ES5'. Modules are automatically in strict mode."),
+        _0_tag_cannot_be_used_independently_as_a_top_level_JSDoc_tag: diag(1253, DiagnosticCategory.Error, "_0_tag_cannot_be_used_independently_as_a_top_level_JSDoc_tag_1253", "'{0}' tag cannot be used independently as a top level JSDoc tag."),
+        A_const_initializer_in_an_ambient_context_must_be_a_string_or_numeric_literal: diag(1254, DiagnosticCategory.Error, "A_const_initializer_in_an_ambient_context_must_be_a_string_or_numeric_literal_1254", "A 'const' initializer in an ambient context must be a string or numeric literal."),
+        A_definite_assignment_assertion_is_not_permitted_in_this_context: diag(1255, DiagnosticCategory.Error, "A_definite_assignment_assertion_is_not_permitted_in_this_context_1255", "A definite assignment assertion '!' is not permitted in this context."),
+        with_statements_are_not_allowed_in_an_async_function_block: diag(1300, DiagnosticCategory.Error, "with_statements_are_not_allowed_in_an_async_function_block_1300", "'with' statements are not allowed in an async function block."),
+        await_expression_is_only_allowed_within_an_async_function: diag(1308, DiagnosticCategory.Error, "await_expression_is_only_allowed_within_an_async_function_1308", "'await' expression is only allowed within an async function."),
+        can_only_be_used_in_an_object_literal_property_inside_a_destructuring_assignment: diag(1312, DiagnosticCategory.Error, "can_only_be_used_in_an_object_literal_property_inside_a_destructuring_assignment_1312", "'=' can only be used in an object literal property inside a destructuring assignment."),
+        The_body_of_an_if_statement_cannot_be_the_empty_statement: diag(1313, DiagnosticCategory.Error, "The_body_of_an_if_statement_cannot_be_the_empty_statement_1313", "The body of an 'if' statement cannot be the empty statement."),
+        Global_module_exports_may_only_appear_in_module_files: diag(1314, DiagnosticCategory.Error, "Global_module_exports_may_only_appear_in_module_files_1314", "Global module exports may only appear in module files."),
+        Global_module_exports_may_only_appear_in_declaration_files: diag(1315, DiagnosticCategory.Error, "Global_module_exports_may_only_appear_in_declaration_files_1315", "Global module exports may only appear in declaration files."),
+        Global_module_exports_may_only_appear_at_top_level: diag(1316, DiagnosticCategory.Error, "Global_module_exports_may_only_appear_at_top_level_1316", "Global module exports may only appear at top level."),
+        A_parameter_property_cannot_be_declared_using_a_rest_parameter: diag(1317, DiagnosticCategory.Error, "A_parameter_property_cannot_be_declared_using_a_rest_parameter_1317", "A parameter property cannot be declared using a rest parameter."),
+        An_abstract_accessor_cannot_have_an_implementation: diag(1318, DiagnosticCategory.Error, "An_abstract_accessor_cannot_have_an_implementation_1318", "An abstract accessor cannot have an implementation."),
+        A_default_export_can_only_be_used_in_an_ECMAScript_style_module: diag(1319, DiagnosticCategory.Error, "A_default_export_can_only_be_used_in_an_ECMAScript_style_module_1319", "A default export can only be used in an ECMAScript-style module."),
+        Type_of_await_operand_must_either_be_a_valid_promise_or_must_not_contain_a_callable_then_member: diag(1320, DiagnosticCategory.Error, "Type_of_await_operand_must_either_be_a_valid_promise_or_must_not_contain_a_callable_then_member_1320", "Type of 'await' operand must either be a valid promise or must not contain a callable 'then' member."),
+        Type_of_yield_operand_in_an_async_generator_must_either_be_a_valid_promise_or_must_not_contain_a_callable_then_member: diag(1321, DiagnosticCategory.Error, "Type_of_yield_operand_in_an_async_generator_must_either_be_a_valid_promise_or_must_not_contain_a_cal_1321", "Type of 'yield' operand in an async generator must either be a valid promise or must not contain a callable 'then' member."),
+        Type_of_iterated_elements_of_a_yield_Asterisk_operand_must_either_be_a_valid_promise_or_must_not_contain_a_callable_then_member: diag(1322, DiagnosticCategory.Error, "Type_of_iterated_elements_of_a_yield_Asterisk_operand_must_either_be_a_valid_promise_or_must_not_con_1322", "Type of iterated elements of a 'yield*' operand must either be a valid promise or must not contain a callable 'then' member."),
+        Dynamic_import_is_only_supported_when_module_flag_is_commonjs_or_esNext: diag(1323, DiagnosticCategory.Error, "Dynamic_import_is_only_supported_when_module_flag_is_commonjs_or_esNext_1323", "Dynamic import is only supported when '--module' flag is 'commonjs' or 'esNext'."),
+        Dynamic_import_must_have_one_specifier_as_an_argument: diag(1324, DiagnosticCategory.Error, "Dynamic_import_must_have_one_specifier_as_an_argument_1324", "Dynamic import must have one specifier as an argument."),
+        Specifier_of_dynamic_import_cannot_be_spread_element: diag(1325, DiagnosticCategory.Error, "Specifier_of_dynamic_import_cannot_be_spread_element_1325", "Specifier of dynamic import cannot be spread element."),
+        Dynamic_import_cannot_have_type_arguments: diag(1326, DiagnosticCategory.Error, "Dynamic_import_cannot_have_type_arguments_1326", "Dynamic import cannot have type arguments"),
+        String_literal_with_double_quotes_expected: diag(1327, DiagnosticCategory.Error, "String_literal_with_double_quotes_expected_1327", "String literal with double quotes expected."),
+        Property_value_can_only_be_string_literal_numeric_literal_true_false_null_object_literal_or_array_literal: diag(1328, DiagnosticCategory.Error, "Property_value_can_only_be_string_literal_numeric_literal_true_false_null_object_literal_or_array_li_1328", "Property value can only be string literal, numeric literal, 'true', 'false', 'null', object literal or array literal."),
+        _0_accepts_too_few_arguments_to_be_used_as_a_decorator_here_Did_you_mean_to_call_it_first_and_write_0: diag(1329, DiagnosticCategory.Error, "_0_accepts_too_few_arguments_to_be_used_as_a_decorator_here_Did_you_mean_to_call_it_first_and_write__1329", "'{0}' accepts too few arguments to be used as a decorator here. Did you mean to call it first and write '@{0}()'?"),
+        A_property_of_an_interface_or_type_literal_whose_type_is_a_unique_symbol_type_must_be_readonly: diag(1330, DiagnosticCategory.Error, "A_property_of_an_interface_or_type_literal_whose_type_is_a_unique_symbol_type_must_be_readonly_1330", "A property of an interface or type literal whose type is a 'unique symbol' type must be 'readonly'."),
+        A_property_of_a_class_whose_type_is_a_unique_symbol_type_must_be_both_static_and_readonly: diag(1331, DiagnosticCategory.Error, "A_property_of_a_class_whose_type_is_a_unique_symbol_type_must_be_both_static_and_readonly_1331", "A property of a class whose type is a 'unique symbol' type must be both 'static' and 'readonly'."),
+        A_variable_whose_type_is_a_unique_symbol_type_must_be_const: diag(1332, DiagnosticCategory.Error, "A_variable_whose_type_is_a_unique_symbol_type_must_be_const_1332", "A variable whose type is a 'unique symbol' type must be 'const'."),
+        unique_symbol_types_may_not_be_used_on_a_variable_declaration_with_a_binding_name: diag(1333, DiagnosticCategory.Error, "unique_symbol_types_may_not_be_used_on_a_variable_declaration_with_a_binding_name_1333", "'unique symbol' types may not be used on a variable declaration with a binding name."),
+        unique_symbol_types_are_only_allowed_on_variables_in_a_variable_statement: diag(1334, DiagnosticCategory.Error, "unique_symbol_types_are_only_allowed_on_variables_in_a_variable_statement_1334", "'unique symbol' types are only allowed on variables in a variable statement."),
+        unique_symbol_types_are_not_allowed_here: diag(1335, DiagnosticCategory.Error, "unique_symbol_types_are_not_allowed_here_1335", "'unique symbol' types are not allowed here."),
+        An_index_signature_parameter_type_cannot_be_a_type_alias_Consider_writing_0_Colon_1_Colon_2_instead: diag(1336, DiagnosticCategory.Error, "An_index_signature_parameter_type_cannot_be_a_type_alias_Consider_writing_0_Colon_1_Colon_2_instead_1336", "An index signature parameter type cannot be a type alias. Consider writing '[{0}: {1}]: {2}' instead."),
+        An_index_signature_parameter_type_cannot_be_a_union_type_Consider_using_a_mapped_object_type_instead: diag(1337, DiagnosticCategory.Error, "An_index_signature_parameter_type_cannot_be_a_union_type_Consider_using_a_mapped_object_type_instead_1337", "An index signature parameter type cannot be a union type. Consider using a mapped object type instead."),
+        infer_declarations_are_only_permitted_in_the_extends_clause_of_a_conditional_type: diag(1338, DiagnosticCategory.Error, "infer_declarations_are_only_permitted_in_the_extends_clause_of_a_conditional_type_1338", "'infer' declarations are only permitted in the 'extends' clause of a conditional type."),
+        Module_0_does_not_refer_to_a_value_but_is_used_as_a_value_here: diag(1339, DiagnosticCategory.Error, "Module_0_does_not_refer_to_a_value_but_is_used_as_a_value_here_1339", "Module '{0}' does not refer to a value, but is used as a value here."),
+        Module_0_does_not_refer_to_a_type_but_is_used_as_a_type_here: diag(1340, DiagnosticCategory.Error, "Module_0_does_not_refer_to_a_type_but_is_used_as_a_type_here_1340", "Module '{0}' does not refer to a type, but is used as a type here."),
+        Type_arguments_cannot_be_used_here: diag(1342, DiagnosticCategory.Error, "Type_arguments_cannot_be_used_here_1342", "Type arguments cannot be used here."),
+        The_import_meta_meta_property_is_only_allowed_using_ESNext_for_the_target_and_module_compiler_options: diag(1343, DiagnosticCategory.Error, "The_import_meta_meta_property_is_only_allowed_using_ESNext_for_the_target_and_module_compiler_option_1343", "The 'import.meta' meta-property is only allowed using 'ESNext' for the 'target' and 'module' compiler options."),
+        Duplicate_identifier_0: diag(2300, DiagnosticCategory.Error, "Duplicate_identifier_0_2300", "Duplicate identifier '{0}'."),
+        Initializer_of_instance_member_variable_0_cannot_reference_identifier_1_declared_in_the_constructor: diag(2301, DiagnosticCategory.Error, "Initializer_of_instance_member_variable_0_cannot_reference_identifier_1_declared_in_the_constructor_2301", "Initializer of instance member variable '{0}' cannot reference identifier '{1}' declared in the constructor."),
+        Static_members_cannot_reference_class_type_parameters: diag(2302, DiagnosticCategory.Error, "Static_members_cannot_reference_class_type_parameters_2302", "Static members cannot reference class type parameters."),
+        Circular_definition_of_import_alias_0: diag(2303, DiagnosticCategory.Error, "Circular_definition_of_import_alias_0_2303", "Circular definition of import alias '{0}'."),
+        Cannot_find_name_0: diag(2304, DiagnosticCategory.Error, "Cannot_find_name_0_2304", "Cannot find name '{0}'."),
+        Module_0_has_no_exported_member_1: diag(2305, DiagnosticCategory.Error, "Module_0_has_no_exported_member_1_2305", "Module '{0}' has no exported member '{1}'."),
+        File_0_is_not_a_module: diag(2306, DiagnosticCategory.Error, "File_0_is_not_a_module_2306", "File '{0}' is not a module."),
+        Cannot_find_module_0: diag(2307, DiagnosticCategory.Error, "Cannot_find_module_0_2307", "Cannot find module '{0}'."),
+        Module_0_has_already_exported_a_member_named_1_Consider_explicitly_re_exporting_to_resolve_the_ambiguity: diag(2308, DiagnosticCategory.Error, "Module_0_has_already_exported_a_member_named_1_Consider_explicitly_re_exporting_to_resolve_the_ambig_2308", "Module {0} has already exported a member named '{1}'. Consider explicitly re-exporting to resolve the ambiguity."),
+        An_export_assignment_cannot_be_used_in_a_module_with_other_exported_elements: diag(2309, DiagnosticCategory.Error, "An_export_assignment_cannot_be_used_in_a_module_with_other_exported_elements_2309", "An export assignment cannot be used in a module with other exported elements."),
+        Type_0_recursively_references_itself_as_a_base_type: diag(2310, DiagnosticCategory.Error, "Type_0_recursively_references_itself_as_a_base_type_2310", "Type '{0}' recursively references itself as a base type."),
+        A_class_may_only_extend_another_class: diag(2311, DiagnosticCategory.Error, "A_class_may_only_extend_another_class_2311", "A class may only extend another class."),
+        An_interface_may_only_extend_a_class_or_another_interface: diag(2312, DiagnosticCategory.Error, "An_interface_may_only_extend_a_class_or_another_interface_2312", "An interface may only extend a class or another interface."),
+        Type_parameter_0_has_a_circular_constraint: diag(2313, DiagnosticCategory.Error, "Type_parameter_0_has_a_circular_constraint_2313", "Type parameter '{0}' has a circular constraint."),
+        Generic_type_0_requires_1_type_argument_s: diag(2314, DiagnosticCategory.Error, "Generic_type_0_requires_1_type_argument_s_2314", "Generic type '{0}' requires {1} type argument(s)."),
+        Type_0_is_not_generic: diag(2315, DiagnosticCategory.Error, "Type_0_is_not_generic_2315", "Type '{0}' is not generic."),
+        Global_type_0_must_be_a_class_or_interface_type: diag(2316, DiagnosticCategory.Error, "Global_type_0_must_be_a_class_or_interface_type_2316", "Global type '{0}' must be a class or interface type."),
+        Global_type_0_must_have_1_type_parameter_s: diag(2317, DiagnosticCategory.Error, "Global_type_0_must_have_1_type_parameter_s_2317", "Global type '{0}' must have {1} type parameter(s)."),
+        Cannot_find_global_type_0: diag(2318, DiagnosticCategory.Error, "Cannot_find_global_type_0_2318", "Cannot find global type '{0}'."),
+        Named_property_0_of_types_1_and_2_are_not_identical: diag(2319, DiagnosticCategory.Error, "Named_property_0_of_types_1_and_2_are_not_identical_2319", "Named property '{0}' of types '{1}' and '{2}' are not identical."),
+        Interface_0_cannot_simultaneously_extend_types_1_and_2: diag(2320, DiagnosticCategory.Error, "Interface_0_cannot_simultaneously_extend_types_1_and_2_2320", "Interface '{0}' cannot simultaneously extend types '{1}' and '{2}'."),
+        Excessive_stack_depth_comparing_types_0_and_1: diag(2321, DiagnosticCategory.Error, "Excessive_stack_depth_comparing_types_0_and_1_2321", "Excessive stack depth comparing types '{0}' and '{1}'."),
+        Type_0_is_not_assignable_to_type_1: diag(2322, DiagnosticCategory.Error, "Type_0_is_not_assignable_to_type_1_2322", "Type '{0}' is not assignable to type '{1}'."),
+        Cannot_redeclare_exported_variable_0: diag(2323, DiagnosticCategory.Error, "Cannot_redeclare_exported_variable_0_2323", "Cannot redeclare exported variable '{0}'."),
+        Property_0_is_missing_in_type_1: diag(2324, DiagnosticCategory.Error, "Property_0_is_missing_in_type_1_2324", "Property '{0}' is missing in type '{1}'."),
+        Property_0_is_private_in_type_1_but_not_in_type_2: diag(2325, DiagnosticCategory.Error, "Property_0_is_private_in_type_1_but_not_in_type_2_2325", "Property '{0}' is private in type '{1}' but not in type '{2}'."),
+        Types_of_property_0_are_incompatible: diag(2326, DiagnosticCategory.Error, "Types_of_property_0_are_incompatible_2326", "Types of property '{0}' are incompatible."),
+        Property_0_is_optional_in_type_1_but_required_in_type_2: diag(2327, DiagnosticCategory.Error, "Property_0_is_optional_in_type_1_but_required_in_type_2_2327", "Property '{0}' is optional in type '{1}' but required in type '{2}'."),
+        Types_of_parameters_0_and_1_are_incompatible: diag(2328, DiagnosticCategory.Error, "Types_of_parameters_0_and_1_are_incompatible_2328", "Types of parameters '{0}' and '{1}' are incompatible."),
+        Index_signature_is_missing_in_type_0: diag(2329, DiagnosticCategory.Error, "Index_signature_is_missing_in_type_0_2329", "Index signature is missing in type '{0}'."),
+        Index_signatures_are_incompatible: diag(2330, DiagnosticCategory.Error, "Index_signatures_are_incompatible_2330", "Index signatures are incompatible."),
+        this_cannot_be_referenced_in_a_module_or_namespace_body: diag(2331, DiagnosticCategory.Error, "this_cannot_be_referenced_in_a_module_or_namespace_body_2331", "'this' cannot be referenced in a module or namespace body."),
+        this_cannot_be_referenced_in_current_location: diag(2332, DiagnosticCategory.Error, "this_cannot_be_referenced_in_current_location_2332", "'this' cannot be referenced in current location."),
+        this_cannot_be_referenced_in_constructor_arguments: diag(2333, DiagnosticCategory.Error, "this_cannot_be_referenced_in_constructor_arguments_2333", "'this' cannot be referenced in constructor arguments."),
+        this_cannot_be_referenced_in_a_static_property_initializer: diag(2334, DiagnosticCategory.Error, "this_cannot_be_referenced_in_a_static_property_initializer_2334", "'this' cannot be referenced in a static property initializer."),
+        super_can_only_be_referenced_in_a_derived_class: diag(2335, DiagnosticCategory.Error, "super_can_only_be_referenced_in_a_derived_class_2335", "'super' can only be referenced in a derived class."),
+        super_cannot_be_referenced_in_constructor_arguments: diag(2336, DiagnosticCategory.Error, "super_cannot_be_referenced_in_constructor_arguments_2336", "'super' cannot be referenced in constructor arguments."),
+        Super_calls_are_not_permitted_outside_constructors_or_in_nested_functions_inside_constructors: diag(2337, DiagnosticCategory.Error, "Super_calls_are_not_permitted_outside_constructors_or_in_nested_functions_inside_constructors_2337", "Super calls are not permitted outside constructors or in nested functions inside constructors."),
+        super_property_access_is_permitted_only_in_a_constructor_member_function_or_member_accessor_of_a_derived_class: diag(2338, DiagnosticCategory.Error, "super_property_access_is_permitted_only_in_a_constructor_member_function_or_member_accessor_of_a_der_2338", "'super' property access is permitted only in a constructor, member function, or member accessor of a derived class."),
+        Property_0_does_not_exist_on_type_1: diag(2339, DiagnosticCategory.Error, "Property_0_does_not_exist_on_type_1_2339", "Property '{0}' does not exist on type '{1}'."),
+        Only_public_and_protected_methods_of_the_base_class_are_accessible_via_the_super_keyword: diag(2340, DiagnosticCategory.Error, "Only_public_and_protected_methods_of_the_base_class_are_accessible_via_the_super_keyword_2340", "Only public and protected methods of the base class are accessible via the 'super' keyword."),
+        Property_0_is_private_and_only_accessible_within_class_1: diag(2341, DiagnosticCategory.Error, "Property_0_is_private_and_only_accessible_within_class_1_2341", "Property '{0}' is private and only accessible within class '{1}'."),
+        An_index_expression_argument_must_be_of_type_string_number_symbol_or_any: diag(2342, DiagnosticCategory.Error, "An_index_expression_argument_must_be_of_type_string_number_symbol_or_any_2342", "An index expression argument must be of type 'string', 'number', 'symbol', or 'any'."),
+        This_syntax_requires_an_imported_helper_named_1_but_module_0_has_no_exported_member_1: diag(2343, DiagnosticCategory.Error, "This_syntax_requires_an_imported_helper_named_1_but_module_0_has_no_exported_member_1_2343", "This syntax requires an imported helper named '{1}', but module '{0}' has no exported member '{1}'."),
+        Type_0_does_not_satisfy_the_constraint_1: diag(2344, DiagnosticCategory.Error, "Type_0_does_not_satisfy_the_constraint_1_2344", "Type '{0}' does not satisfy the constraint '{1}'."),
+        Argument_of_type_0_is_not_assignable_to_parameter_of_type_1: diag(2345, DiagnosticCategory.Error, "Argument_of_type_0_is_not_assignable_to_parameter_of_type_1_2345", "Argument of type '{0}' is not assignable to parameter of type '{1}'."),
+        Call_target_does_not_contain_any_signatures: diag(2346, DiagnosticCategory.Error, "Call_target_does_not_contain_any_signatures_2346", "Call target does not contain any signatures."),
+        Untyped_function_calls_may_not_accept_type_arguments: diag(2347, DiagnosticCategory.Error, "Untyped_function_calls_may_not_accept_type_arguments_2347", "Untyped function calls may not accept type arguments."),
+        Value_of_type_0_is_not_callable_Did_you_mean_to_include_new: diag(2348, DiagnosticCategory.Error, "Value_of_type_0_is_not_callable_Did_you_mean_to_include_new_2348", "Value of type '{0}' is not callable. Did you mean to include 'new'?"),
+        Cannot_invoke_an_expression_whose_type_lacks_a_call_signature_Type_0_has_no_compatible_call_signatures: diag(2349, DiagnosticCategory.Error, "Cannot_invoke_an_expression_whose_type_lacks_a_call_signature_Type_0_has_no_compatible_call_signatur_2349", "Cannot invoke an expression whose type lacks a call signature. Type '{0}' has no compatible call signatures."),
+        Only_a_void_function_can_be_called_with_the_new_keyword: diag(2350, DiagnosticCategory.Error, "Only_a_void_function_can_be_called_with_the_new_keyword_2350", "Only a void function can be called with the 'new' keyword."),
+        Cannot_use_new_with_an_expression_whose_type_lacks_a_call_or_construct_signature: diag(2351, DiagnosticCategory.Error, "Cannot_use_new_with_an_expression_whose_type_lacks_a_call_or_construct_signature_2351", "Cannot use 'new' with an expression whose type lacks a call or construct signature."),
+        Type_0_cannot_be_converted_to_type_1: diag(2352, DiagnosticCategory.Error, "Type_0_cannot_be_converted_to_type_1_2352", "Type '{0}' cannot be converted to type '{1}'."),
+        Object_literal_may_only_specify_known_properties_and_0_does_not_exist_in_type_1: diag(2353, DiagnosticCategory.Error, "Object_literal_may_only_specify_known_properties_and_0_does_not_exist_in_type_1_2353", "Object literal may only specify known properties, and '{0}' does not exist in type '{1}'."),
+        This_syntax_requires_an_imported_helper_but_module_0_cannot_be_found: diag(2354, DiagnosticCategory.Error, "This_syntax_requires_an_imported_helper_but_module_0_cannot_be_found_2354", "This syntax requires an imported helper but module '{0}' cannot be found."),
+        A_function_whose_declared_type_is_neither_void_nor_any_must_return_a_value: diag(2355, DiagnosticCategory.Error, "A_function_whose_declared_type_is_neither_void_nor_any_must_return_a_value_2355", "A function whose declared type is neither 'void' nor 'any' must return a value."),
+        An_arithmetic_operand_must_be_of_type_any_number_or_an_enum_type: diag(2356, DiagnosticCategory.Error, "An_arithmetic_operand_must_be_of_type_any_number_or_an_enum_type_2356", "An arithmetic operand must be of type 'any', 'number' or an enum type."),
+        The_operand_of_an_increment_or_decrement_operator_must_be_a_variable_or_a_property_access: diag(2357, DiagnosticCategory.Error, "The_operand_of_an_increment_or_decrement_operator_must_be_a_variable_or_a_property_access_2357", "The operand of an increment or decrement operator must be a variable or a property access."),
+        The_left_hand_side_of_an_instanceof_expression_must_be_of_type_any_an_object_type_or_a_type_parameter: diag(2358, DiagnosticCategory.Error, "The_left_hand_side_of_an_instanceof_expression_must_be_of_type_any_an_object_type_or_a_type_paramete_2358", "The left-hand side of an 'instanceof' expression must be of type 'any', an object type or a type parameter."),
+        The_right_hand_side_of_an_instanceof_expression_must_be_of_type_any_or_of_a_type_assignable_to_the_Function_interface_type: diag(2359, DiagnosticCategory.Error, "The_right_hand_side_of_an_instanceof_expression_must_be_of_type_any_or_of_a_type_assignable_to_the_F_2359", "The right-hand side of an 'instanceof' expression must be of type 'any' or of a type assignable to the 'Function' interface type."),
+        The_left_hand_side_of_an_in_expression_must_be_of_type_any_string_number_or_symbol: diag(2360, DiagnosticCategory.Error, "The_left_hand_side_of_an_in_expression_must_be_of_type_any_string_number_or_symbol_2360", "The left-hand side of an 'in' expression must be of type 'any', 'string', 'number', or 'symbol'."),
+        The_right_hand_side_of_an_in_expression_must_be_of_type_any_an_object_type_or_a_type_parameter: diag(2361, DiagnosticCategory.Error, "The_right_hand_side_of_an_in_expression_must_be_of_type_any_an_object_type_or_a_type_parameter_2361", "The right-hand side of an 'in' expression must be of type 'any', an object type or a type parameter."),
+        The_left_hand_side_of_an_arithmetic_operation_must_be_of_type_any_number_or_an_enum_type: diag(2362, DiagnosticCategory.Error, "The_left_hand_side_of_an_arithmetic_operation_must_be_of_type_any_number_or_an_enum_type_2362", "The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type."),
+        The_right_hand_side_of_an_arithmetic_operation_must_be_of_type_any_number_or_an_enum_type: diag(2363, DiagnosticCategory.Error, "The_right_hand_side_of_an_arithmetic_operation_must_be_of_type_any_number_or_an_enum_type_2363", "The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type."),
+        The_left_hand_side_of_an_assignment_expression_must_be_a_variable_or_a_property_access: diag(2364, DiagnosticCategory.Error, "The_left_hand_side_of_an_assignment_expression_must_be_a_variable_or_a_property_access_2364", "The left-hand side of an assignment expression must be a variable or a property access."),
+        Operator_0_cannot_be_applied_to_types_1_and_2: diag(2365, DiagnosticCategory.Error, "Operator_0_cannot_be_applied_to_types_1_and_2_2365", "Operator '{0}' cannot be applied to types '{1}' and '{2}'."),
+        Function_lacks_ending_return_statement_and_return_type_does_not_include_undefined: diag(2366, DiagnosticCategory.Error, "Function_lacks_ending_return_statement_and_return_type_does_not_include_undefined_2366", "Function lacks ending return statement and return type does not include 'undefined'."),
+        Type_parameter_name_cannot_be_0: diag(2368, DiagnosticCategory.Error, "Type_parameter_name_cannot_be_0_2368", "Type parameter name cannot be '{0}'."),
+        A_parameter_property_is_only_allowed_in_a_constructor_implementation: diag(2369, DiagnosticCategory.Error, "A_parameter_property_is_only_allowed_in_a_constructor_implementation_2369", "A parameter property is only allowed in a constructor implementation."),
+        A_rest_parameter_must_be_of_an_array_type: diag(2370, DiagnosticCategory.Error, "A_rest_parameter_must_be_of_an_array_type_2370", "A rest parameter must be of an array type."),
+        A_parameter_initializer_is_only_allowed_in_a_function_or_constructor_implementation: diag(2371, DiagnosticCategory.Error, "A_parameter_initializer_is_only_allowed_in_a_function_or_constructor_implementation_2371", "A parameter initializer is only allowed in a function or constructor implementation."),
+        Parameter_0_cannot_be_referenced_in_its_initializer: diag(2372, DiagnosticCategory.Error, "Parameter_0_cannot_be_referenced_in_its_initializer_2372", "Parameter '{0}' cannot be referenced in its initializer."),
+        Initializer_of_parameter_0_cannot_reference_identifier_1_declared_after_it: diag(2373, DiagnosticCategory.Error, "Initializer_of_parameter_0_cannot_reference_identifier_1_declared_after_it_2373", "Initializer of parameter '{0}' cannot reference identifier '{1}' declared after it."),
+        Duplicate_string_index_signature: diag(2374, DiagnosticCategory.Error, "Duplicate_string_index_signature_2374", "Duplicate string index signature."),
+        Duplicate_number_index_signature: diag(2375, DiagnosticCategory.Error, "Duplicate_number_index_signature_2375", "Duplicate number index signature."),
+        A_super_call_must_be_the_first_statement_in_the_constructor_when_a_class_contains_initialized_properties_or_has_parameter_properties: diag(2376, DiagnosticCategory.Error, "A_super_call_must_be_the_first_statement_in_the_constructor_when_a_class_contains_initialized_proper_2376", "A 'super' call must be the first statement in the constructor when a class contains initialized properties or has parameter properties."),
+        Constructors_for_derived_classes_must_contain_a_super_call: diag(2377, DiagnosticCategory.Error, "Constructors_for_derived_classes_must_contain_a_super_call_2377", "Constructors for derived classes must contain a 'super' call."),
+        A_get_accessor_must_return_a_value: diag(2378, DiagnosticCategory.Error, "A_get_accessor_must_return_a_value_2378", "A 'get' accessor must return a value."),
+        Getter_and_setter_accessors_do_not_agree_in_visibility: diag(2379, DiagnosticCategory.Error, "Getter_and_setter_accessors_do_not_agree_in_visibility_2379", "Getter and setter accessors do not agree in visibility."),
+        get_and_set_accessor_must_have_the_same_type: diag(2380, DiagnosticCategory.Error, "get_and_set_accessor_must_have_the_same_type_2380", "'get' and 'set' accessor must have the same type."),
+        A_signature_with_an_implementation_cannot_use_a_string_literal_type: diag(2381, DiagnosticCategory.Error, "A_signature_with_an_implementation_cannot_use_a_string_literal_type_2381", "A signature with an implementation cannot use a string literal type."),
+        Specialized_overload_signature_is_not_assignable_to_any_non_specialized_signature: diag(2382, DiagnosticCategory.Error, "Specialized_overload_signature_is_not_assignable_to_any_non_specialized_signature_2382", "Specialized overload signature is not assignable to any non-specialized signature."),
+        Overload_signatures_must_all_be_exported_or_non_exported: diag(2383, DiagnosticCategory.Error, "Overload_signatures_must_all_be_exported_or_non_exported_2383", "Overload signatures must all be exported or non-exported."),
+        Overload_signatures_must_all_be_ambient_or_non_ambient: diag(2384, DiagnosticCategory.Error, "Overload_signatures_must_all_be_ambient_or_non_ambient_2384", "Overload signatures must all be ambient or non-ambient."),
+        Overload_signatures_must_all_be_public_private_or_protected: diag(2385, DiagnosticCategory.Error, "Overload_signatures_must_all_be_public_private_or_protected_2385", "Overload signatures must all be public, private or protected."),
+        Overload_signatures_must_all_be_optional_or_required: diag(2386, DiagnosticCategory.Error, "Overload_signatures_must_all_be_optional_or_required_2386", "Overload signatures must all be optional or required."),
+        Function_overload_must_be_static: diag(2387, DiagnosticCategory.Error, "Function_overload_must_be_static_2387", "Function overload must be static."),
+        Function_overload_must_not_be_static: diag(2388, DiagnosticCategory.Error, "Function_overload_must_not_be_static_2388", "Function overload must not be static."),
+        Function_implementation_name_must_be_0: diag(2389, DiagnosticCategory.Error, "Function_implementation_name_must_be_0_2389", "Function implementation name must be '{0}'."),
+        Constructor_implementation_is_missing: diag(2390, DiagnosticCategory.Error, "Constructor_implementation_is_missing_2390", "Constructor implementation is missing."),
+        Function_implementation_is_missing_or_not_immediately_following_the_declaration: diag(2391, DiagnosticCategory.Error, "Function_implementation_is_missing_or_not_immediately_following_the_declaration_2391", "Function implementation is missing or not immediately following the declaration."),
+        Multiple_constructor_implementations_are_not_allowed: diag(2392, DiagnosticCategory.Error, "Multiple_constructor_implementations_are_not_allowed_2392", "Multiple constructor implementations are not allowed."),
+        Duplicate_function_implementation: diag(2393, DiagnosticCategory.Error, "Duplicate_function_implementation_2393", "Duplicate function implementation."),
+        Overload_signature_is_not_compatible_with_function_implementation: diag(2394, DiagnosticCategory.Error, "Overload_signature_is_not_compatible_with_function_implementation_2394", "Overload signature is not compatible with function implementation."),
+        Individual_declarations_in_merged_declaration_0_must_be_all_exported_or_all_local: diag(2395, DiagnosticCategory.Error, "Individual_declarations_in_merged_declaration_0_must_be_all_exported_or_all_local_2395", "Individual declarations in merged declaration '{0}' must be all exported or all local."),
+        Duplicate_identifier_arguments_Compiler_uses_arguments_to_initialize_rest_parameters: diag(2396, DiagnosticCategory.Error, "Duplicate_identifier_arguments_Compiler_uses_arguments_to_initialize_rest_parameters_2396", "Duplicate identifier 'arguments'. Compiler uses 'arguments' to initialize rest parameters."),
+        Declaration_name_conflicts_with_built_in_global_identifier_0: diag(2397, DiagnosticCategory.Error, "Declaration_name_conflicts_with_built_in_global_identifier_0_2397", "Declaration name conflicts with built-in global identifier '{0}'."),
+        Duplicate_identifier_this_Compiler_uses_variable_declaration_this_to_capture_this_reference: diag(2399, DiagnosticCategory.Error, "Duplicate_identifier_this_Compiler_uses_variable_declaration_this_to_capture_this_reference_2399", "Duplicate identifier '_this'. Compiler uses variable declaration '_this' to capture 'this' reference."),
+        Expression_resolves_to_variable_declaration_this_that_compiler_uses_to_capture_this_reference: diag(2400, DiagnosticCategory.Error, "Expression_resolves_to_variable_declaration_this_that_compiler_uses_to_capture_this_reference_2400", "Expression resolves to variable declaration '_this' that compiler uses to capture 'this' reference."),
+        Duplicate_identifier_super_Compiler_uses_super_to_capture_base_class_reference: diag(2401, DiagnosticCategory.Error, "Duplicate_identifier_super_Compiler_uses_super_to_capture_base_class_reference_2401", "Duplicate identifier '_super'. Compiler uses '_super' to capture base class reference."),
+        Expression_resolves_to_super_that_compiler_uses_to_capture_base_class_reference: diag(2402, DiagnosticCategory.Error, "Expression_resolves_to_super_that_compiler_uses_to_capture_base_class_reference_2402", "Expression resolves to '_super' that compiler uses to capture base class reference."),
+        Subsequent_variable_declarations_must_have_the_same_type_Variable_0_must_be_of_type_1_but_here_has_type_2: diag(2403, DiagnosticCategory.Error, "Subsequent_variable_declarations_must_have_the_same_type_Variable_0_must_be_of_type_1_but_here_has_t_2403", "Subsequent variable declarations must have the same type.  Variable '{0}' must be of type '{1}', but here has type '{2}'."),
+        The_left_hand_side_of_a_for_in_statement_cannot_use_a_type_annotation: diag(2404, DiagnosticCategory.Error, "The_left_hand_side_of_a_for_in_statement_cannot_use_a_type_annotation_2404", "The left-hand side of a 'for...in' statement cannot use a type annotation."),
+        The_left_hand_side_of_a_for_in_statement_must_be_of_type_string_or_any: diag(2405, DiagnosticCategory.Error, "The_left_hand_side_of_a_for_in_statement_must_be_of_type_string_or_any_2405", "The left-hand side of a 'for...in' statement must be of type 'string' or 'any'."),
+        The_left_hand_side_of_a_for_in_statement_must_be_a_variable_or_a_property_access: diag(2406, DiagnosticCategory.Error, "The_left_hand_side_of_a_for_in_statement_must_be_a_variable_or_a_property_access_2406", "The left-hand side of a 'for...in' statement must be a variable or a property access."),
+        The_right_hand_side_of_a_for_in_statement_must_be_of_type_any_an_object_type_or_a_type_parameter_but_here_has_type_0: diag(2407, DiagnosticCategory.Error, "The_right_hand_side_of_a_for_in_statement_must_be_of_type_any_an_object_type_or_a_type_parameter_but_2407", "The right-hand side of a 'for...in' statement must be of type 'any', an object type or a type parameter, but here has type '{0}'."),
+        Setters_cannot_return_a_value: diag(2408, DiagnosticCategory.Error, "Setters_cannot_return_a_value_2408", "Setters cannot return a value."),
+        Return_type_of_constructor_signature_must_be_assignable_to_the_instance_type_of_the_class: diag(2409, DiagnosticCategory.Error, "Return_type_of_constructor_signature_must_be_assignable_to_the_instance_type_of_the_class_2409", "Return type of constructor signature must be assignable to the instance type of the class."),
+        The_with_statement_is_not_supported_All_symbols_in_a_with_block_will_have_type_any: diag(2410, DiagnosticCategory.Error, "The_with_statement_is_not_supported_All_symbols_in_a_with_block_will_have_type_any_2410", "The 'with' statement is not supported. All symbols in a 'with' block will have type 'any'."),
+        Property_0_of_type_1_is_not_assignable_to_string_index_type_2: diag(2411, DiagnosticCategory.Error, "Property_0_of_type_1_is_not_assignable_to_string_index_type_2_2411", "Property '{0}' of type '{1}' is not assignable to string index type '{2}'."),
+        Property_0_of_type_1_is_not_assignable_to_numeric_index_type_2: diag(2412, DiagnosticCategory.Error, "Property_0_of_type_1_is_not_assignable_to_numeric_index_type_2_2412", "Property '{0}' of type '{1}' is not assignable to numeric index type '{2}'."),
+        Numeric_index_type_0_is_not_assignable_to_string_index_type_1: diag(2413, DiagnosticCategory.Error, "Numeric_index_type_0_is_not_assignable_to_string_index_type_1_2413", "Numeric index type '{0}' is not assignable to string index type '{1}'."),
+        Class_name_cannot_be_0: diag(2414, DiagnosticCategory.Error, "Class_name_cannot_be_0_2414", "Class name cannot be '{0}'."),
+        Class_0_incorrectly_extends_base_class_1: diag(2415, DiagnosticCategory.Error, "Class_0_incorrectly_extends_base_class_1_2415", "Class '{0}' incorrectly extends base class '{1}'."),
+        Property_0_in_type_1_is_not_assignable_to_the_same_property_in_base_type_2: diag(2416, DiagnosticCategory.Error, "Property_0_in_type_1_is_not_assignable_to_the_same_property_in_base_type_2_2416", "Property '{0}' in type '{1}' is not assignable to the same property in base type '{2}'."),
+        Class_static_side_0_incorrectly_extends_base_class_static_side_1: diag(2417, DiagnosticCategory.Error, "Class_static_side_0_incorrectly_extends_base_class_static_side_1_2417", "Class static side '{0}' incorrectly extends base class static side '{1}'."),
+        Class_0_incorrectly_implements_interface_1: diag(2420, DiagnosticCategory.Error, "Class_0_incorrectly_implements_interface_1_2420", "Class '{0}' incorrectly implements interface '{1}'."),
+        A_class_may_only_implement_another_class_or_interface: diag(2422, DiagnosticCategory.Error, "A_class_may_only_implement_another_class_or_interface_2422", "A class may only implement another class or interface."),
+        Class_0_defines_instance_member_function_1_but_extended_class_2_defines_it_as_instance_member_accessor: diag(2423, DiagnosticCategory.Error, "Class_0_defines_instance_member_function_1_but_extended_class_2_defines_it_as_instance_member_access_2423", "Class '{0}' defines instance member function '{1}', but extended class '{2}' defines it as instance member accessor."),
+        Class_0_defines_instance_member_function_1_but_extended_class_2_defines_it_as_instance_member_property: diag(2424, DiagnosticCategory.Error, "Class_0_defines_instance_member_function_1_but_extended_class_2_defines_it_as_instance_member_proper_2424", "Class '{0}' defines instance member function '{1}', but extended class '{2}' defines it as instance member property."),
+        Class_0_defines_instance_member_property_1_but_extended_class_2_defines_it_as_instance_member_function: diag(2425, DiagnosticCategory.Error, "Class_0_defines_instance_member_property_1_but_extended_class_2_defines_it_as_instance_member_functi_2425", "Class '{0}' defines instance member property '{1}', but extended class '{2}' defines it as instance member function."),
+        Class_0_defines_instance_member_accessor_1_but_extended_class_2_defines_it_as_instance_member_function: diag(2426, DiagnosticCategory.Error, "Class_0_defines_instance_member_accessor_1_but_extended_class_2_defines_it_as_instance_member_functi_2426", "Class '{0}' defines instance member accessor '{1}', but extended class '{2}' defines it as instance member function."),
+        Interface_name_cannot_be_0: diag(2427, DiagnosticCategory.Error, "Interface_name_cannot_be_0_2427", "Interface name cannot be '{0}'."),
+        All_declarations_of_0_must_have_identical_type_parameters: diag(2428, DiagnosticCategory.Error, "All_declarations_of_0_must_have_identical_type_parameters_2428", "All declarations of '{0}' must have identical type parameters."),
+        Interface_0_incorrectly_extends_interface_1: diag(2430, DiagnosticCategory.Error, "Interface_0_incorrectly_extends_interface_1_2430", "Interface '{0}' incorrectly extends interface '{1}'."),
+        Enum_name_cannot_be_0: diag(2431, DiagnosticCategory.Error, "Enum_name_cannot_be_0_2431", "Enum name cannot be '{0}'."),
+        In_an_enum_with_multiple_declarations_only_one_declaration_can_omit_an_initializer_for_its_first_enum_element: diag(2432, DiagnosticCategory.Error, "In_an_enum_with_multiple_declarations_only_one_declaration_can_omit_an_initializer_for_its_first_enu_2432", "In an enum with multiple declarations, only one declaration can omit an initializer for its first enum element."),
+        A_namespace_declaration_cannot_be_in_a_different_file_from_a_class_or_function_with_which_it_is_merged: diag(2433, DiagnosticCategory.Error, "A_namespace_declaration_cannot_be_in_a_different_file_from_a_class_or_function_with_which_it_is_merg_2433", "A namespace declaration cannot be in a different file from a class or function with which it is merged."),
+        A_namespace_declaration_cannot_be_located_prior_to_a_class_or_function_with_which_it_is_merged: diag(2434, DiagnosticCategory.Error, "A_namespace_declaration_cannot_be_located_prior_to_a_class_or_function_with_which_it_is_merged_2434", "A namespace declaration cannot be located prior to a class or function with which it is merged."),
+        Ambient_modules_cannot_be_nested_in_other_modules_or_namespaces: diag(2435, DiagnosticCategory.Error, "Ambient_modules_cannot_be_nested_in_other_modules_or_namespaces_2435", "Ambient modules cannot be nested in other modules or namespaces."),
+        Ambient_module_declaration_cannot_specify_relative_module_name: diag(2436, DiagnosticCategory.Error, "Ambient_module_declaration_cannot_specify_relative_module_name_2436", "Ambient module declaration cannot specify relative module name."),
+        Module_0_is_hidden_by_a_local_declaration_with_the_same_name: diag(2437, DiagnosticCategory.Error, "Module_0_is_hidden_by_a_local_declaration_with_the_same_name_2437", "Module '{0}' is hidden by a local declaration with the same name."),
+        Import_name_cannot_be_0: diag(2438, DiagnosticCategory.Error, "Import_name_cannot_be_0_2438", "Import name cannot be '{0}'."),
+        Import_or_export_declaration_in_an_ambient_module_declaration_cannot_reference_module_through_relative_module_name: diag(2439, DiagnosticCategory.Error, "Import_or_export_declaration_in_an_ambient_module_declaration_cannot_reference_module_through_relati_2439", "Import or export declaration in an ambient module declaration cannot reference module through relative module name."),
+        Import_declaration_conflicts_with_local_declaration_of_0: diag(2440, DiagnosticCategory.Error, "Import_declaration_conflicts_with_local_declaration_of_0_2440", "Import declaration conflicts with local declaration of '{0}'."),
+        Duplicate_identifier_0_Compiler_reserves_name_1_in_top_level_scope_of_a_module: diag(2441, DiagnosticCategory.Error, "Duplicate_identifier_0_Compiler_reserves_name_1_in_top_level_scope_of_a_module_2441", "Duplicate identifier '{0}'. Compiler reserves name '{1}' in top level scope of a module."),
+        Types_have_separate_declarations_of_a_private_property_0: diag(2442, DiagnosticCategory.Error, "Types_have_separate_declarations_of_a_private_property_0_2442", "Types have separate declarations of a private property '{0}'."),
+        Property_0_is_protected_but_type_1_is_not_a_class_derived_from_2: diag(2443, DiagnosticCategory.Error, "Property_0_is_protected_but_type_1_is_not_a_class_derived_from_2_2443", "Property '{0}' is protected but type '{1}' is not a class derived from '{2}'."),
+        Property_0_is_protected_in_type_1_but_public_in_type_2: diag(2444, DiagnosticCategory.Error, "Property_0_is_protected_in_type_1_but_public_in_type_2_2444", "Property '{0}' is protected in type '{1}' but public in type '{2}'."),
+        Property_0_is_protected_and_only_accessible_within_class_1_and_its_subclasses: diag(2445, DiagnosticCategory.Error, "Property_0_is_protected_and_only_accessible_within_class_1_and_its_subclasses_2445", "Property '{0}' is protected and only accessible within class '{1}' and its subclasses."),
+        Property_0_is_protected_and_only_accessible_through_an_instance_of_class_1: diag(2446, DiagnosticCategory.Error, "Property_0_is_protected_and_only_accessible_through_an_instance_of_class_1_2446", "Property '{0}' is protected and only accessible through an instance of class '{1}'."),
+        The_0_operator_is_not_allowed_for_boolean_types_Consider_using_1_instead: diag(2447, DiagnosticCategory.Error, "The_0_operator_is_not_allowed_for_boolean_types_Consider_using_1_instead_2447", "The '{0}' operator is not allowed for boolean types. Consider using '{1}' instead."),
+        Block_scoped_variable_0_used_before_its_declaration: diag(2448, DiagnosticCategory.Error, "Block_scoped_variable_0_used_before_its_declaration_2448", "Block-scoped variable '{0}' used before its declaration."),
+        Class_0_used_before_its_declaration: diag(2449, DiagnosticCategory.Error, "Class_0_used_before_its_declaration_2449", "Class '{0}' used before its declaration."),
+        Enum_0_used_before_its_declaration: diag(2450, DiagnosticCategory.Error, "Enum_0_used_before_its_declaration_2450", "Enum '{0}' used before its declaration."),
+        Cannot_redeclare_block_scoped_variable_0: diag(2451, DiagnosticCategory.Error, "Cannot_redeclare_block_scoped_variable_0_2451", "Cannot redeclare block-scoped variable '{0}'."),
+        An_enum_member_cannot_have_a_numeric_name: diag(2452, DiagnosticCategory.Error, "An_enum_member_cannot_have_a_numeric_name_2452", "An enum member cannot have a numeric name."),
+        The_type_argument_for_type_parameter_0_cannot_be_inferred_from_the_usage_Consider_specifying_the_type_arguments_explicitly: diag(2453, DiagnosticCategory.Error, "The_type_argument_for_type_parameter_0_cannot_be_inferred_from_the_usage_Consider_specifying_the_typ_2453", "The type argument for type parameter '{0}' cannot be inferred from the usage. Consider specifying the type arguments explicitly."),
+        Variable_0_is_used_before_being_assigned: diag(2454, DiagnosticCategory.Error, "Variable_0_is_used_before_being_assigned_2454", "Variable '{0}' is used before being assigned."),
+        Type_argument_candidate_1_is_not_a_valid_type_argument_because_it_is_not_a_supertype_of_candidate_0: diag(2455, DiagnosticCategory.Error, "Type_argument_candidate_1_is_not_a_valid_type_argument_because_it_is_not_a_supertype_of_candidate_0_2455", "Type argument candidate '{1}' is not a valid type argument because it is not a supertype of candidate '{0}'."),
+        Type_alias_0_circularly_references_itself: diag(2456, DiagnosticCategory.Error, "Type_alias_0_circularly_references_itself_2456", "Type alias '{0}' circularly references itself."),
+        Type_alias_name_cannot_be_0: diag(2457, DiagnosticCategory.Error, "Type_alias_name_cannot_be_0_2457", "Type alias name cannot be '{0}'."),
+        An_AMD_module_cannot_have_multiple_name_assignments: diag(2458, DiagnosticCategory.Error, "An_AMD_module_cannot_have_multiple_name_assignments_2458", "An AMD module cannot have multiple name assignments."),
+        Type_0_has_no_property_1_and_no_string_index_signature: diag(2459, DiagnosticCategory.Error, "Type_0_has_no_property_1_and_no_string_index_signature_2459", "Type '{0}' has no property '{1}' and no string index signature."),
+        Type_0_has_no_property_1: diag(2460, DiagnosticCategory.Error, "Type_0_has_no_property_1_2460", "Type '{0}' has no property '{1}'."),
+        Type_0_is_not_an_array_type: diag(2461, DiagnosticCategory.Error, "Type_0_is_not_an_array_type_2461", "Type '{0}' is not an array type."),
+        A_rest_element_must_be_last_in_a_destructuring_pattern: diag(2462, DiagnosticCategory.Error, "A_rest_element_must_be_last_in_a_destructuring_pattern_2462", "A rest element must be last in a destructuring pattern."),
+        A_binding_pattern_parameter_cannot_be_optional_in_an_implementation_signature: diag(2463, DiagnosticCategory.Error, "A_binding_pattern_parameter_cannot_be_optional_in_an_implementation_signature_2463", "A binding pattern parameter cannot be optional in an implementation signature."),
+        A_computed_property_name_must_be_of_type_string_number_symbol_or_any: diag(2464, DiagnosticCategory.Error, "A_computed_property_name_must_be_of_type_string_number_symbol_or_any_2464", "A computed property name must be of type 'string', 'number', 'symbol', or 'any'."),
+        this_cannot_be_referenced_in_a_computed_property_name: diag(2465, DiagnosticCategory.Error, "this_cannot_be_referenced_in_a_computed_property_name_2465", "'this' cannot be referenced in a computed property name."),
+        super_cannot_be_referenced_in_a_computed_property_name: diag(2466, DiagnosticCategory.Error, "super_cannot_be_referenced_in_a_computed_property_name_2466", "'super' cannot be referenced in a computed property name."),
+        A_computed_property_name_cannot_reference_a_type_parameter_from_its_containing_type: diag(2467, DiagnosticCategory.Error, "A_computed_property_name_cannot_reference_a_type_parameter_from_its_containing_type_2467", "A computed property name cannot reference a type parameter from its containing type."),
+        Cannot_find_global_value_0: diag(2468, DiagnosticCategory.Error, "Cannot_find_global_value_0_2468", "Cannot find global value '{0}'."),
+        The_0_operator_cannot_be_applied_to_type_symbol: diag(2469, DiagnosticCategory.Error, "The_0_operator_cannot_be_applied_to_type_symbol_2469", "The '{0}' operator cannot be applied to type 'symbol'."),
+        Symbol_reference_does_not_refer_to_the_global_Symbol_constructor_object: diag(2470, DiagnosticCategory.Error, "Symbol_reference_does_not_refer_to_the_global_Symbol_constructor_object_2470", "'Symbol' reference does not refer to the global Symbol constructor object."),
+        A_computed_property_name_of_the_form_0_must_be_of_type_symbol: diag(2471, DiagnosticCategory.Error, "A_computed_property_name_of_the_form_0_must_be_of_type_symbol_2471", "A computed property name of the form '{0}' must be of type 'symbol'."),
+        Spread_operator_in_new_expressions_is_only_available_when_targeting_ECMAScript_5_and_higher: diag(2472, DiagnosticCategory.Error, "Spread_operator_in_new_expressions_is_only_available_when_targeting_ECMAScript_5_and_higher_2472", "Spread operator in 'new' expressions is only available when targeting ECMAScript 5 and higher."),
+        Enum_declarations_must_all_be_const_or_non_const: diag(2473, DiagnosticCategory.Error, "Enum_declarations_must_all_be_const_or_non_const_2473", "Enum declarations must all be const or non-const."),
+        In_const_enum_declarations_member_initializer_must_be_constant_expression: diag(2474, DiagnosticCategory.Error, "In_const_enum_declarations_member_initializer_must_be_constant_expression_2474", "In 'const' enum declarations member initializer must be constant expression."),
+        const_enums_can_only_be_used_in_property_or_index_access_expressions_or_the_right_hand_side_of_an_import_declaration_or_export_assignment_or_type_query: diag(2475, DiagnosticCategory.Error, "const_enums_can_only_be_used_in_property_or_index_access_expressions_or_the_right_hand_side_of_an_im_2475", "'const' enums can only be used in property or index access expressions or the right hand side of an import declaration or export assignment or type query."),
+        A_const_enum_member_can_only_be_accessed_using_a_string_literal: diag(2476, DiagnosticCategory.Error, "A_const_enum_member_can_only_be_accessed_using_a_string_literal_2476", "A const enum member can only be accessed using a string literal."),
+        const_enum_member_initializer_was_evaluated_to_a_non_finite_value: diag(2477, DiagnosticCategory.Error, "const_enum_member_initializer_was_evaluated_to_a_non_finite_value_2477", "'const' enum member initializer was evaluated to a non-finite value."),
+        const_enum_member_initializer_was_evaluated_to_disallowed_value_NaN: diag(2478, DiagnosticCategory.Error, "const_enum_member_initializer_was_evaluated_to_disallowed_value_NaN_2478", "'const' enum member initializer was evaluated to disallowed value 'NaN'."),
+        Property_0_does_not_exist_on_const_enum_1: diag(2479, DiagnosticCategory.Error, "Property_0_does_not_exist_on_const_enum_1_2479", "Property '{0}' does not exist on 'const' enum '{1}'."),
+        let_is_not_allowed_to_be_used_as_a_name_in_let_or_const_declarations: diag(2480, DiagnosticCategory.Error, "let_is_not_allowed_to_be_used_as_a_name_in_let_or_const_declarations_2480", "'let' is not allowed to be used as a name in 'let' or 'const' declarations."),
+        Cannot_initialize_outer_scoped_variable_0_in_the_same_scope_as_block_scoped_declaration_1: diag(2481, DiagnosticCategory.Error, "Cannot_initialize_outer_scoped_variable_0_in_the_same_scope_as_block_scoped_declaration_1_2481", "Cannot initialize outer scoped variable '{0}' in the same scope as block scoped declaration '{1}'."),
+        The_left_hand_side_of_a_for_of_statement_cannot_use_a_type_annotation: diag(2483, DiagnosticCategory.Error, "The_left_hand_side_of_a_for_of_statement_cannot_use_a_type_annotation_2483", "The left-hand side of a 'for...of' statement cannot use a type annotation."),
+        Export_declaration_conflicts_with_exported_declaration_of_0: diag(2484, DiagnosticCategory.Error, "Export_declaration_conflicts_with_exported_declaration_of_0_2484", "Export declaration conflicts with exported declaration of '{0}'."),
+        The_left_hand_side_of_a_for_of_statement_must_be_a_variable_or_a_property_access: diag(2487, DiagnosticCategory.Error, "The_left_hand_side_of_a_for_of_statement_must_be_a_variable_or_a_property_access_2487", "The left-hand side of a 'for...of' statement must be a variable or a property access."),
+        Type_0_must_have_a_Symbol_iterator_method_that_returns_an_iterator: diag(2488, DiagnosticCategory.Error, "Type_0_must_have_a_Symbol_iterator_method_that_returns_an_iterator_2488", "Type '{0}' must have a '[Symbol.iterator]()' method that returns an iterator."),
+        An_iterator_must_have_a_next_method: diag(2489, DiagnosticCategory.Error, "An_iterator_must_have_a_next_method_2489", "An iterator must have a 'next()' method."),
+        The_type_returned_by_the_next_method_of_an_iterator_must_have_a_value_property: diag(2490, DiagnosticCategory.Error, "The_type_returned_by_the_next_method_of_an_iterator_must_have_a_value_property_2490", "The type returned by the 'next()' method of an iterator must have a 'value' property."),
+        The_left_hand_side_of_a_for_in_statement_cannot_be_a_destructuring_pattern: diag(2491, DiagnosticCategory.Error, "The_left_hand_side_of_a_for_in_statement_cannot_be_a_destructuring_pattern_2491", "The left-hand side of a 'for...in' statement cannot be a destructuring pattern."),
+        Cannot_redeclare_identifier_0_in_catch_clause: diag(2492, DiagnosticCategory.Error, "Cannot_redeclare_identifier_0_in_catch_clause_2492", "Cannot redeclare identifier '{0}' in catch clause."),
+        Tuple_type_0_with_length_1_cannot_be_assigned_to_tuple_with_length_2: diag(2493, DiagnosticCategory.Error, "Tuple_type_0_with_length_1_cannot_be_assigned_to_tuple_with_length_2_2493", "Tuple type '{0}' with length '{1}' cannot be assigned to tuple with length '{2}'."),
+        Using_a_string_in_a_for_of_statement_is_only_supported_in_ECMAScript_5_and_higher: diag(2494, DiagnosticCategory.Error, "Using_a_string_in_a_for_of_statement_is_only_supported_in_ECMAScript_5_and_higher_2494", "Using a string in a 'for...of' statement is only supported in ECMAScript 5 and higher."),
+        Type_0_is_not_an_array_type_or_a_string_type: diag(2495, DiagnosticCategory.Error, "Type_0_is_not_an_array_type_or_a_string_type_2495", "Type '{0}' is not an array type or a string type."),
+        The_arguments_object_cannot_be_referenced_in_an_arrow_function_in_ES3_and_ES5_Consider_using_a_standard_function_expression: diag(2496, DiagnosticCategory.Error, "The_arguments_object_cannot_be_referenced_in_an_arrow_function_in_ES3_and_ES5_Consider_using_a_stand_2496", "The 'arguments' object cannot be referenced in an arrow function in ES3 and ES5. Consider using a standard function expression."),
+        Module_0_resolves_to_a_non_module_entity_and_cannot_be_imported_using_this_construct: diag(2497, DiagnosticCategory.Error, "Module_0_resolves_to_a_non_module_entity_and_cannot_be_imported_using_this_construct_2497", "Module '{0}' resolves to a non-module entity and cannot be imported using this construct."),
+        Module_0_uses_export_and_cannot_be_used_with_export_Asterisk: diag(2498, DiagnosticCategory.Error, "Module_0_uses_export_and_cannot_be_used_with_export_Asterisk_2498", "Module '{0}' uses 'export =' and cannot be used with 'export *'."),
+        An_interface_can_only_extend_an_identifier_Slashqualified_name_with_optional_type_arguments: diag(2499, DiagnosticCategory.Error, "An_interface_can_only_extend_an_identifier_Slashqualified_name_with_optional_type_arguments_2499", "An interface can only extend an identifier/qualified-name with optional type arguments."),
+        A_class_can_only_implement_an_identifier_Slashqualified_name_with_optional_type_arguments: diag(2500, DiagnosticCategory.Error, "A_class_can_only_implement_an_identifier_Slashqualified_name_with_optional_type_arguments_2500", "A class can only implement an identifier/qualified-name with optional type arguments."),
+        A_rest_element_cannot_contain_a_binding_pattern: diag(2501, DiagnosticCategory.Error, "A_rest_element_cannot_contain_a_binding_pattern_2501", "A rest element cannot contain a binding pattern."),
+        _0_is_referenced_directly_or_indirectly_in_its_own_type_annotation: diag(2502, DiagnosticCategory.Error, "_0_is_referenced_directly_or_indirectly_in_its_own_type_annotation_2502", "'{0}' is referenced directly or indirectly in its own type annotation."),
+        Cannot_find_namespace_0: diag(2503, DiagnosticCategory.Error, "Cannot_find_namespace_0_2503", "Cannot find namespace '{0}'."),
+        Type_0_must_have_a_Symbol_asyncIterator_method_that_returns_an_async_iterator: diag(2504, DiagnosticCategory.Error, "Type_0_must_have_a_Symbol_asyncIterator_method_that_returns_an_async_iterator_2504", "Type '{0}' must have a '[Symbol.asyncIterator]()' method that returns an async iterator."),
+        A_generator_cannot_have_a_void_type_annotation: diag(2505, DiagnosticCategory.Error, "A_generator_cannot_have_a_void_type_annotation_2505", "A generator cannot have a 'void' type annotation."),
+        _0_is_referenced_directly_or_indirectly_in_its_own_base_expression: diag(2506, DiagnosticCategory.Error, "_0_is_referenced_directly_or_indirectly_in_its_own_base_expression_2506", "'{0}' is referenced directly or indirectly in its own base expression."),
+        Type_0_is_not_a_constructor_function_type: diag(2507, DiagnosticCategory.Error, "Type_0_is_not_a_constructor_function_type_2507", "Type '{0}' is not a constructor function type."),
+        No_base_constructor_has_the_specified_number_of_type_arguments: diag(2508, DiagnosticCategory.Error, "No_base_constructor_has_the_specified_number_of_type_arguments_2508", "No base constructor has the specified number of type arguments."),
+        Base_constructor_return_type_0_is_not_a_class_or_interface_type: diag(2509, DiagnosticCategory.Error, "Base_constructor_return_type_0_is_not_a_class_or_interface_type_2509", "Base constructor return type '{0}' is not a class or interface type."),
+        Base_constructors_must_all_have_the_same_return_type: diag(2510, DiagnosticCategory.Error, "Base_constructors_must_all_have_the_same_return_type_2510", "Base constructors must all have the same return type."),
+        Cannot_create_an_instance_of_an_abstract_class: diag(2511, DiagnosticCategory.Error, "Cannot_create_an_instance_of_an_abstract_class_2511", "Cannot create an instance of an abstract class."),
+        Overload_signatures_must_all_be_abstract_or_non_abstract: diag(2512, DiagnosticCategory.Error, "Overload_signatures_must_all_be_abstract_or_non_abstract_2512", "Overload signatures must all be abstract or non-abstract."),
+        Abstract_method_0_in_class_1_cannot_be_accessed_via_super_expression: diag(2513, DiagnosticCategory.Error, "Abstract_method_0_in_class_1_cannot_be_accessed_via_super_expression_2513", "Abstract method '{0}' in class '{1}' cannot be accessed via super expression."),
+        Classes_containing_abstract_methods_must_be_marked_abstract: diag(2514, DiagnosticCategory.Error, "Classes_containing_abstract_methods_must_be_marked_abstract_2514", "Classes containing abstract methods must be marked abstract."),
+        Non_abstract_class_0_does_not_implement_inherited_abstract_member_1_from_class_2: diag(2515, DiagnosticCategory.Error, "Non_abstract_class_0_does_not_implement_inherited_abstract_member_1_from_class_2_2515", "Non-abstract class '{0}' does not implement inherited abstract member '{1}' from class '{2}'."),
+        All_declarations_of_an_abstract_method_must_be_consecutive: diag(2516, DiagnosticCategory.Error, "All_declarations_of_an_abstract_method_must_be_consecutive_2516", "All declarations of an abstract method must be consecutive."),
+        Cannot_assign_an_abstract_constructor_type_to_a_non_abstract_constructor_type: diag(2517, DiagnosticCategory.Error, "Cannot_assign_an_abstract_constructor_type_to_a_non_abstract_constructor_type_2517", "Cannot assign an abstract constructor type to a non-abstract constructor type."),
+        A_this_based_type_guard_is_not_compatible_with_a_parameter_based_type_guard: diag(2518, DiagnosticCategory.Error, "A_this_based_type_guard_is_not_compatible_with_a_parameter_based_type_guard_2518", "A 'this'-based type guard is not compatible with a parameter-based type guard."),
+        An_async_iterator_must_have_a_next_method: diag(2519, DiagnosticCategory.Error, "An_async_iterator_must_have_a_next_method_2519", "An async iterator must have a 'next()' method."),
+        Duplicate_identifier_0_Compiler_uses_declaration_1_to_support_async_functions: diag(2520, DiagnosticCategory.Error, "Duplicate_identifier_0_Compiler_uses_declaration_1_to_support_async_functions_2520", "Duplicate identifier '{0}'. Compiler uses declaration '{1}' to support async functions."),
+        Expression_resolves_to_variable_declaration_0_that_compiler_uses_to_support_async_functions: diag(2521, DiagnosticCategory.Error, "Expression_resolves_to_variable_declaration_0_that_compiler_uses_to_support_async_functions_2521", "Expression resolves to variable declaration '{0}' that compiler uses to support async functions."),
+        The_arguments_object_cannot_be_referenced_in_an_async_function_or_method_in_ES3_and_ES5_Consider_using_a_standard_function_or_method: diag(2522, DiagnosticCategory.Error, "The_arguments_object_cannot_be_referenced_in_an_async_function_or_method_in_ES3_and_ES5_Consider_usi_2522", "The 'arguments' object cannot be referenced in an async function or method in ES3 and ES5. Consider using a standard function or method."),
+        yield_expressions_cannot_be_used_in_a_parameter_initializer: diag(2523, DiagnosticCategory.Error, "yield_expressions_cannot_be_used_in_a_parameter_initializer_2523", "'yield' expressions cannot be used in a parameter initializer."),
+        await_expressions_cannot_be_used_in_a_parameter_initializer: diag(2524, DiagnosticCategory.Error, "await_expressions_cannot_be_used_in_a_parameter_initializer_2524", "'await' expressions cannot be used in a parameter initializer."),
+        Initializer_provides_no_value_for_this_binding_element_and_the_binding_element_has_no_default_value: diag(2525, DiagnosticCategory.Error, "Initializer_provides_no_value_for_this_binding_element_and_the_binding_element_has_no_default_value_2525", "Initializer provides no value for this binding element and the binding element has no default value."),
+        A_this_type_is_available_only_in_a_non_static_member_of_a_class_or_interface: diag(2526, DiagnosticCategory.Error, "A_this_type_is_available_only_in_a_non_static_member_of_a_class_or_interface_2526", "A 'this' type is available only in a non-static member of a class or interface."),
+        The_inferred_type_of_0_references_an_inaccessible_1_type_A_type_annotation_is_necessary: diag(2527, DiagnosticCategory.Error, "The_inferred_type_of_0_references_an_inaccessible_1_type_A_type_annotation_is_necessary_2527", "The inferred type of '{0}' references an inaccessible '{1}' type. A type annotation is necessary."),
+        A_module_cannot_have_multiple_default_exports: diag(2528, DiagnosticCategory.Error, "A_module_cannot_have_multiple_default_exports_2528", "A module cannot have multiple default exports."),
+        Duplicate_identifier_0_Compiler_reserves_name_1_in_top_level_scope_of_a_module_containing_async_functions: diag(2529, DiagnosticCategory.Error, "Duplicate_identifier_0_Compiler_reserves_name_1_in_top_level_scope_of_a_module_containing_async_func_2529", "Duplicate identifier '{0}'. Compiler reserves name '{1}' in top level scope of a module containing async functions."),
+        Property_0_is_incompatible_with_index_signature: diag(2530, DiagnosticCategory.Error, "Property_0_is_incompatible_with_index_signature_2530", "Property '{0}' is incompatible with index signature."),
+        Object_is_possibly_null: diag(2531, DiagnosticCategory.Error, "Object_is_possibly_null_2531", "Object is possibly 'null'."),
+        Object_is_possibly_undefined: diag(2532, DiagnosticCategory.Error, "Object_is_possibly_undefined_2532", "Object is possibly 'undefined'."),
+        Object_is_possibly_null_or_undefined: diag(2533, DiagnosticCategory.Error, "Object_is_possibly_null_or_undefined_2533", "Object is possibly 'null' or 'undefined'."),
+        A_function_returning_never_cannot_have_a_reachable_end_point: diag(2534, DiagnosticCategory.Error, "A_function_returning_never_cannot_have_a_reachable_end_point_2534", "A function returning 'never' cannot have a reachable end point."),
+        Enum_type_0_has_members_with_initializers_that_are_not_literals: diag(2535, DiagnosticCategory.Error, "Enum_type_0_has_members_with_initializers_that_are_not_literals_2535", "Enum type '{0}' has members with initializers that are not literals."),
+        Type_0_cannot_be_used_to_index_type_1: diag(2536, DiagnosticCategory.Error, "Type_0_cannot_be_used_to_index_type_1_2536", "Type '{0}' cannot be used to index type '{1}'."),
+        Type_0_has_no_matching_index_signature_for_type_1: diag(2537, DiagnosticCategory.Error, "Type_0_has_no_matching_index_signature_for_type_1_2537", "Type '{0}' has no matching index signature for type '{1}'."),
+        Type_0_cannot_be_used_as_an_index_type: diag(2538, DiagnosticCategory.Error, "Type_0_cannot_be_used_as_an_index_type_2538", "Type '{0}' cannot be used as an index type."),
+        Cannot_assign_to_0_because_it_is_not_a_variable: diag(2539, DiagnosticCategory.Error, "Cannot_assign_to_0_because_it_is_not_a_variable_2539", "Cannot assign to '{0}' because it is not a variable."),
+        Cannot_assign_to_0_because_it_is_a_constant_or_a_read_only_property: diag(2540, DiagnosticCategory.Error, "Cannot_assign_to_0_because_it_is_a_constant_or_a_read_only_property_2540", "Cannot assign to '{0}' because it is a constant or a read-only property."),
+        The_target_of_an_assignment_must_be_a_variable_or_a_property_access: diag(2541, DiagnosticCategory.Error, "The_target_of_an_assignment_must_be_a_variable_or_a_property_access_2541", "The target of an assignment must be a variable or a property access."),
+        Index_signature_in_type_0_only_permits_reading: diag(2542, DiagnosticCategory.Error, "Index_signature_in_type_0_only_permits_reading_2542", "Index signature in type '{0}' only permits reading."),
+        Duplicate_identifier_newTarget_Compiler_uses_variable_declaration_newTarget_to_capture_new_target_meta_property_reference: diag(2543, DiagnosticCategory.Error, "Duplicate_identifier_newTarget_Compiler_uses_variable_declaration_newTarget_to_capture_new_target_me_2543", "Duplicate identifier '_newTarget'. Compiler uses variable declaration '_newTarget' to capture 'new.target' meta-property reference."),
+        Expression_resolves_to_variable_declaration_newTarget_that_compiler_uses_to_capture_new_target_meta_property_reference: diag(2544, DiagnosticCategory.Error, "Expression_resolves_to_variable_declaration_newTarget_that_compiler_uses_to_capture_new_target_meta__2544", "Expression resolves to variable declaration '_newTarget' that compiler uses to capture 'new.target' meta-property reference."),
+        A_mixin_class_must_have_a_constructor_with_a_single_rest_parameter_of_type_any: diag(2545, DiagnosticCategory.Error, "A_mixin_class_must_have_a_constructor_with_a_single_rest_parameter_of_type_any_2545", "A mixin class must have a constructor with a single rest parameter of type 'any[]'."),
+        Property_0_has_conflicting_declarations_and_is_inaccessible_in_type_1: diag(2546, DiagnosticCategory.Error, "Property_0_has_conflicting_declarations_and_is_inaccessible_in_type_1_2546", "Property '{0}' has conflicting declarations and is inaccessible in type '{1}'."),
+        The_type_returned_by_the_next_method_of_an_async_iterator_must_be_a_promise_for_a_type_with_a_value_property: diag(2547, DiagnosticCategory.Error, "The_type_returned_by_the_next_method_of_an_async_iterator_must_be_a_promise_for_a_type_with_a_value__2547", "The type returned by the 'next()' method of an async iterator must be a promise for a type with a 'value' property."),
+        Type_0_is_not_an_array_type_or_does_not_have_a_Symbol_iterator_method_that_returns_an_iterator: diag(2548, DiagnosticCategory.Error, "Type_0_is_not_an_array_type_or_does_not_have_a_Symbol_iterator_method_that_returns_an_iterator_2548", "Type '{0}' is not an array type or does not have a '[Symbol.iterator]()' method that returns an iterator."),
+        Type_0_is_not_an_array_type_or_a_string_type_or_does_not_have_a_Symbol_iterator_method_that_returns_an_iterator: diag(2549, DiagnosticCategory.Error, "Type_0_is_not_an_array_type_or_a_string_type_or_does_not_have_a_Symbol_iterator_method_that_returns__2549", "Type '{0}' is not an array type or a string type or does not have a '[Symbol.iterator]()' method that returns an iterator."),
+        Generic_type_instantiation_is_excessively_deep_and_possibly_infinite: diag(2550, DiagnosticCategory.Error, "Generic_type_instantiation_is_excessively_deep_and_possibly_infinite_2550", "Generic type instantiation is excessively deep and possibly infinite."),
+        Property_0_does_not_exist_on_type_1_Did_you_mean_2: diag(2551, DiagnosticCategory.Error, "Property_0_does_not_exist_on_type_1_Did_you_mean_2_2551", "Property '{0}' does not exist on type '{1}'. Did you mean '{2}'?"),
+        Cannot_find_name_0_Did_you_mean_1: diag(2552, DiagnosticCategory.Error, "Cannot_find_name_0_Did_you_mean_1_2552", "Cannot find name '{0}'. Did you mean '{1}'?"),
+        Computed_values_are_not_permitted_in_an_enum_with_string_valued_members: diag(2553, DiagnosticCategory.Error, "Computed_values_are_not_permitted_in_an_enum_with_string_valued_members_2553", "Computed values are not permitted in an enum with string valued members."),
+        Expected_0_arguments_but_got_1: diag(2554, DiagnosticCategory.Error, "Expected_0_arguments_but_got_1_2554", "Expected {0} arguments, but got {1}."),
+        Expected_at_least_0_arguments_but_got_1: diag(2555, DiagnosticCategory.Error, "Expected_at_least_0_arguments_but_got_1_2555", "Expected at least {0} arguments, but got {1}."),
+        Expected_0_arguments_but_got_1_or_more: diag(2556, DiagnosticCategory.Error, "Expected_0_arguments_but_got_1_or_more_2556", "Expected {0} arguments, but got {1} or more."),
+        Expected_at_least_0_arguments_but_got_1_or_more: diag(2557, DiagnosticCategory.Error, "Expected_at_least_0_arguments_but_got_1_or_more_2557", "Expected at least {0} arguments, but got {1} or more."),
+        Expected_0_type_arguments_but_got_1: diag(2558, DiagnosticCategory.Error, "Expected_0_type_arguments_but_got_1_2558", "Expected {0} type arguments, but got {1}."),
+        Type_0_has_no_properties_in_common_with_type_1: diag(2559, DiagnosticCategory.Error, "Type_0_has_no_properties_in_common_with_type_1_2559", "Type '{0}' has no properties in common with type '{1}'."),
+        Value_of_type_0_has_no_properties_in_common_with_type_1_Did_you_mean_to_call_it: diag(2560, DiagnosticCategory.Error, "Value_of_type_0_has_no_properties_in_common_with_type_1_Did_you_mean_to_call_it_2560", "Value of type '{0}' has no properties in common with type '{1}'. Did you mean to call it?"),
+        Object_literal_may_only_specify_known_properties_but_0_does_not_exist_in_type_1_Did_you_mean_to_write_2: diag(2561, DiagnosticCategory.Error, "Object_literal_may_only_specify_known_properties_but_0_does_not_exist_in_type_1_Did_you_mean_to_writ_2561", "Object literal may only specify known properties, but '{0}' does not exist in type '{1}'. Did you mean to write '{2}'?"),
+        Base_class_expressions_cannot_reference_class_type_parameters: diag(2562, DiagnosticCategory.Error, "Base_class_expressions_cannot_reference_class_type_parameters_2562", "Base class expressions cannot reference class type parameters."),
+        The_containing_function_or_module_body_is_too_large_for_control_flow_analysis: diag(2563, DiagnosticCategory.Error, "The_containing_function_or_module_body_is_too_large_for_control_flow_analysis_2563", "The containing function or module body is too large for control flow analysis."),
+        Property_0_has_no_initializer_and_is_not_definitely_assigned_in_the_constructor: diag(2564, DiagnosticCategory.Error, "Property_0_has_no_initializer_and_is_not_definitely_assigned_in_the_constructor_2564", "Property '{0}' has no initializer and is not definitely assigned in the constructor."),
+        Property_0_is_used_before_being_assigned: diag(2565, DiagnosticCategory.Error, "Property_0_is_used_before_being_assigned_2565", "Property '{0}' is used before being assigned."),
+        A_rest_element_cannot_have_a_property_name: diag(2566, DiagnosticCategory.Error, "A_rest_element_cannot_have_a_property_name_2566", "A rest element cannot have a property name."),
+        Enum_declarations_can_only_merge_with_namespace_or_other_enum_declarations: diag(2567, DiagnosticCategory.Error, "Enum_declarations_can_only_merge_with_namespace_or_other_enum_declarations_2567", "Enum declarations can only merge with namespace or other enum declarations."),
+        Type_0_is_not_an_array_type_Use_compiler_option_downlevelIteration_to_allow_iterating_of_iterators: diag(2568, DiagnosticCategory.Error, "Type_0_is_not_an_array_type_Use_compiler_option_downlevelIteration_to_allow_iterating_of_iterators_2568", "Type '{0}' is not an array type. Use compiler option '--downlevelIteration' to allow iterating of iterators."),
+        Type_0_is_not_an_array_type_or_a_string_type_Use_compiler_option_downlevelIteration_to_allow_iterating_of_iterators: diag(2569, DiagnosticCategory.Error, "Type_0_is_not_an_array_type_or_a_string_type_Use_compiler_option_downlevelIteration_to_allow_iterati_2569", "Type '{0}' is not an array type or a string type. Use compiler option '--downlevelIteration' to allow iterating of iterators."),
+        Property_0_does_not_exist_on_type_1_Did_you_forget_to_use_await: diag(2570, DiagnosticCategory.Error, "Property_0_does_not_exist_on_type_1_Did_you_forget_to_use_await_2570", "Property '{0}' does not exist on type '{1}'. Did you forget to use 'await'?"),
+        Object_is_of_type_unknown: diag(2571, DiagnosticCategory.Error, "Object_is_of_type_unknown_2571", "Object is of type 'unknown'."),
+        JSX_element_attributes_type_0_may_not_be_a_union_type: diag(2600, DiagnosticCategory.Error, "JSX_element_attributes_type_0_may_not_be_a_union_type_2600", "JSX element attributes type '{0}' may not be a union type."),
+        The_return_type_of_a_JSX_element_constructor_must_return_an_object_type: diag(2601, DiagnosticCategory.Error, "The_return_type_of_a_JSX_element_constructor_must_return_an_object_type_2601", "The return type of a JSX element constructor must return an object type."),
+        JSX_element_implicitly_has_type_any_because_the_global_type_JSX_Element_does_not_exist: diag(2602, DiagnosticCategory.Error, "JSX_element_implicitly_has_type_any_because_the_global_type_JSX_Element_does_not_exist_2602", "JSX element implicitly has type 'any' because the global type 'JSX.Element' does not exist."),
+        Property_0_in_type_1_is_not_assignable_to_type_2: diag(2603, DiagnosticCategory.Error, "Property_0_in_type_1_is_not_assignable_to_type_2_2603", "Property '{0}' in type '{1}' is not assignable to type '{2}'."),
+        JSX_element_type_0_does_not_have_any_construct_or_call_signatures: diag(2604, DiagnosticCategory.Error, "JSX_element_type_0_does_not_have_any_construct_or_call_signatures_2604", "JSX element type '{0}' does not have any construct or call signatures."),
+        JSX_element_type_0_is_not_a_constructor_function_for_JSX_elements: diag(2605, DiagnosticCategory.Error, "JSX_element_type_0_is_not_a_constructor_function_for_JSX_elements_2605", "JSX element type '{0}' is not a constructor function for JSX elements."),
+        Property_0_of_JSX_spread_attribute_is_not_assignable_to_target_property: diag(2606, DiagnosticCategory.Error, "Property_0_of_JSX_spread_attribute_is_not_assignable_to_target_property_2606", "Property '{0}' of JSX spread attribute is not assignable to target property."),
+        JSX_element_class_does_not_support_attributes_because_it_does_not_have_a_0_property: diag(2607, DiagnosticCategory.Error, "JSX_element_class_does_not_support_attributes_because_it_does_not_have_a_0_property_2607", "JSX element class does not support attributes because it does not have a '{0}' property."),
+        The_global_type_JSX_0_may_not_have_more_than_one_property: diag(2608, DiagnosticCategory.Error, "The_global_type_JSX_0_may_not_have_more_than_one_property_2608", "The global type 'JSX.{0}' may not have more than one property."),
+        JSX_spread_child_must_be_an_array_type: diag(2609, DiagnosticCategory.Error, "JSX_spread_child_must_be_an_array_type_2609", "JSX spread child must be an array type."),
+        Cannot_augment_module_0_with_value_exports_because_it_resolves_to_a_non_module_entity: diag(2649, DiagnosticCategory.Error, "Cannot_augment_module_0_with_value_exports_because_it_resolves_to_a_non_module_entity_2649", "Cannot augment module '{0}' with value exports because it resolves to a non-module entity."),
+        A_member_initializer_in_a_enum_declaration_cannot_reference_members_declared_after_it_including_members_defined_in_other_enums: diag(2651, DiagnosticCategory.Error, "A_member_initializer_in_a_enum_declaration_cannot_reference_members_declared_after_it_including_memb_2651", "A member initializer in a enum declaration cannot reference members declared after it, including members defined in other enums."),
+        Merged_declaration_0_cannot_include_a_default_export_declaration_Consider_adding_a_separate_export_default_0_declaration_instead: diag(2652, DiagnosticCategory.Error, "Merged_declaration_0_cannot_include_a_default_export_declaration_Consider_adding_a_separate_export_d_2652", "Merged declaration '{0}' cannot include a default export declaration. Consider adding a separate 'export default {0}' declaration instead."),
+        Non_abstract_class_expression_does_not_implement_inherited_abstract_member_0_from_class_1: diag(2653, DiagnosticCategory.Error, "Non_abstract_class_expression_does_not_implement_inherited_abstract_member_0_from_class_1_2653", "Non-abstract class expression does not implement inherited abstract member '{0}' from class '{1}'."),
+        Exported_external_package_typings_file_cannot_contain_tripleslash_references_Please_contact_the_package_author_to_update_the_package_definition: diag(2654, DiagnosticCategory.Error, "Exported_external_package_typings_file_cannot_contain_tripleslash_references_Please_contact_the_pack_2654", "Exported external package typings file cannot contain tripleslash references. Please contact the package author to update the package definition."),
+        Exported_external_package_typings_file_0_is_not_a_module_Please_contact_the_package_author_to_update_the_package_definition: diag(2656, DiagnosticCategory.Error, "Exported_external_package_typings_file_0_is_not_a_module_Please_contact_the_package_author_to_update_2656", "Exported external package typings file '{0}' is not a module. Please contact the package author to update the package definition."),
+        JSX_expressions_must_have_one_parent_element: diag(2657, DiagnosticCategory.Error, "JSX_expressions_must_have_one_parent_element_2657", "JSX expressions must have one parent element."),
+        Type_0_provides_no_match_for_the_signature_1: diag(2658, DiagnosticCategory.Error, "Type_0_provides_no_match_for_the_signature_1_2658", "Type '{0}' provides no match for the signature '{1}'."),
+        super_is_only_allowed_in_members_of_object_literal_expressions_when_option_target_is_ES2015_or_higher: diag(2659, DiagnosticCategory.Error, "super_is_only_allowed_in_members_of_object_literal_expressions_when_option_target_is_ES2015_or_highe_2659", "'super' is only allowed in members of object literal expressions when option 'target' is 'ES2015' or higher."),
+        super_can_only_be_referenced_in_members_of_derived_classes_or_object_literal_expressions: diag(2660, DiagnosticCategory.Error, "super_can_only_be_referenced_in_members_of_derived_classes_or_object_literal_expressions_2660", "'super' can only be referenced in members of derived classes or object literal expressions."),
+        Cannot_export_0_Only_local_declarations_can_be_exported_from_a_module: diag(2661, DiagnosticCategory.Error, "Cannot_export_0_Only_local_declarations_can_be_exported_from_a_module_2661", "Cannot export '{0}'. Only local declarations can be exported from a module."),
+        Cannot_find_name_0_Did_you_mean_the_static_member_1_0: diag(2662, DiagnosticCategory.Error, "Cannot_find_name_0_Did_you_mean_the_static_member_1_0_2662", "Cannot find name '{0}'. Did you mean the static member '{1}.{0}'?"),
+        Cannot_find_name_0_Did_you_mean_the_instance_member_this_0: diag(2663, DiagnosticCategory.Error, "Cannot_find_name_0_Did_you_mean_the_instance_member_this_0_2663", "Cannot find name '{0}'. Did you mean the instance member 'this.{0}'?"),
+        Invalid_module_name_in_augmentation_module_0_cannot_be_found: diag(2664, DiagnosticCategory.Error, "Invalid_module_name_in_augmentation_module_0_cannot_be_found_2664", "Invalid module name in augmentation, module '{0}' cannot be found."),
+        Invalid_module_name_in_augmentation_Module_0_resolves_to_an_untyped_module_at_1_which_cannot_be_augmented: diag(2665, DiagnosticCategory.Error, "Invalid_module_name_in_augmentation_Module_0_resolves_to_an_untyped_module_at_1_which_cannot_be_augm_2665", "Invalid module name in augmentation. Module '{0}' resolves to an untyped module at '{1}', which cannot be augmented."),
+        Exports_and_export_assignments_are_not_permitted_in_module_augmentations: diag(2666, DiagnosticCategory.Error, "Exports_and_export_assignments_are_not_permitted_in_module_augmentations_2666", "Exports and export assignments are not permitted in module augmentations."),
+        Imports_are_not_permitted_in_module_augmentations_Consider_moving_them_to_the_enclosing_external_module: diag(2667, DiagnosticCategory.Error, "Imports_are_not_permitted_in_module_augmentations_Consider_moving_them_to_the_enclosing_external_mod_2667", "Imports are not permitted in module augmentations. Consider moving them to the enclosing external module."),
+        export_modifier_cannot_be_applied_to_ambient_modules_and_module_augmentations_since_they_are_always_visible: diag(2668, DiagnosticCategory.Error, "export_modifier_cannot_be_applied_to_ambient_modules_and_module_augmentations_since_they_are_always__2668", "'export' modifier cannot be applied to ambient modules and module augmentations since they are always visible."),
+        Augmentations_for_the_global_scope_can_only_be_directly_nested_in_external_modules_or_ambient_module_declarations: diag(2669, DiagnosticCategory.Error, "Augmentations_for_the_global_scope_can_only_be_directly_nested_in_external_modules_or_ambient_module_2669", "Augmentations for the global scope can only be directly nested in external modules or ambient module declarations."),
+        Augmentations_for_the_global_scope_should_have_declare_modifier_unless_they_appear_in_already_ambient_context: diag(2670, DiagnosticCategory.Error, "Augmentations_for_the_global_scope_should_have_declare_modifier_unless_they_appear_in_already_ambien_2670", "Augmentations for the global scope should have 'declare' modifier unless they appear in already ambient context."),
+        Cannot_augment_module_0_because_it_resolves_to_a_non_module_entity: diag(2671, DiagnosticCategory.Error, "Cannot_augment_module_0_because_it_resolves_to_a_non_module_entity_2671", "Cannot augment module '{0}' because it resolves to a non-module entity."),
+        Cannot_assign_a_0_constructor_type_to_a_1_constructor_type: diag(2672, DiagnosticCategory.Error, "Cannot_assign_a_0_constructor_type_to_a_1_constructor_type_2672", "Cannot assign a '{0}' constructor type to a '{1}' constructor type."),
+        Constructor_of_class_0_is_private_and_only_accessible_within_the_class_declaration: diag(2673, DiagnosticCategory.Error, "Constructor_of_class_0_is_private_and_only_accessible_within_the_class_declaration_2673", "Constructor of class '{0}' is private and only accessible within the class declaration."),
+        Constructor_of_class_0_is_protected_and_only_accessible_within_the_class_declaration: diag(2674, DiagnosticCategory.Error, "Constructor_of_class_0_is_protected_and_only_accessible_within_the_class_declaration_2674", "Constructor of class '{0}' is protected and only accessible within the class declaration."),
+        Cannot_extend_a_class_0_Class_constructor_is_marked_as_private: diag(2675, DiagnosticCategory.Error, "Cannot_extend_a_class_0_Class_constructor_is_marked_as_private_2675", "Cannot extend a class '{0}'. Class constructor is marked as private."),
+        Accessors_must_both_be_abstract_or_non_abstract: diag(2676, DiagnosticCategory.Error, "Accessors_must_both_be_abstract_or_non_abstract_2676", "Accessors must both be abstract or non-abstract."),
+        A_type_predicate_s_type_must_be_assignable_to_its_parameter_s_type: diag(2677, DiagnosticCategory.Error, "A_type_predicate_s_type_must_be_assignable_to_its_parameter_s_type_2677", "A type predicate's type must be assignable to its parameter's type."),
+        Type_0_is_not_comparable_to_type_1: diag(2678, DiagnosticCategory.Error, "Type_0_is_not_comparable_to_type_1_2678", "Type '{0}' is not comparable to type '{1}'."),
+        A_function_that_is_called_with_the_new_keyword_cannot_have_a_this_type_that_is_void: diag(2679, DiagnosticCategory.Error, "A_function_that_is_called_with_the_new_keyword_cannot_have_a_this_type_that_is_void_2679", "A function that is called with the 'new' keyword cannot have a 'this' type that is 'void'."),
+        A_0_parameter_must_be_the_first_parameter: diag(2680, DiagnosticCategory.Error, "A_0_parameter_must_be_the_first_parameter_2680", "A '{0}' parameter must be the first parameter."),
+        A_constructor_cannot_have_a_this_parameter: diag(2681, DiagnosticCategory.Error, "A_constructor_cannot_have_a_this_parameter_2681", "A constructor cannot have a 'this' parameter."),
+        get_and_set_accessor_must_have_the_same_this_type: diag(2682, DiagnosticCategory.Error, "get_and_set_accessor_must_have_the_same_this_type_2682", "'get' and 'set' accessor must have the same 'this' type."),
+        this_implicitly_has_type_any_because_it_does_not_have_a_type_annotation: diag(2683, DiagnosticCategory.Error, "this_implicitly_has_type_any_because_it_does_not_have_a_type_annotation_2683", "'this' implicitly has type 'any' because it does not have a type annotation."),
+        The_this_context_of_type_0_is_not_assignable_to_method_s_this_of_type_1: diag(2684, DiagnosticCategory.Error, "The_this_context_of_type_0_is_not_assignable_to_method_s_this_of_type_1_2684", "The 'this' context of type '{0}' is not assignable to method's 'this' of type '{1}'."),
+        The_this_types_of_each_signature_are_incompatible: diag(2685, DiagnosticCategory.Error, "The_this_types_of_each_signature_are_incompatible_2685", "The 'this' types of each signature are incompatible."),
+        _0_refers_to_a_UMD_global_but_the_current_file_is_a_module_Consider_adding_an_import_instead: diag(2686, DiagnosticCategory.Error, "_0_refers_to_a_UMD_global_but_the_current_file_is_a_module_Consider_adding_an_import_instead_2686", "'{0}' refers to a UMD global, but the current file is a module. Consider adding an import instead."),
+        All_declarations_of_0_must_have_identical_modifiers: diag(2687, DiagnosticCategory.Error, "All_declarations_of_0_must_have_identical_modifiers_2687", "All declarations of '{0}' must have identical modifiers."),
+        Cannot_find_type_definition_file_for_0: diag(2688, DiagnosticCategory.Error, "Cannot_find_type_definition_file_for_0_2688", "Cannot find type definition file for '{0}'."),
+        Cannot_extend_an_interface_0_Did_you_mean_implements: diag(2689, DiagnosticCategory.Error, "Cannot_extend_an_interface_0_Did_you_mean_implements_2689", "Cannot extend an interface '{0}'. Did you mean 'implements'?"),
+        An_import_path_cannot_end_with_a_0_extension_Consider_importing_1_instead: diag(2691, DiagnosticCategory.Error, "An_import_path_cannot_end_with_a_0_extension_Consider_importing_1_instead_2691", "An import path cannot end with a '{0}' extension. Consider importing '{1}' instead."),
+        _0_is_a_primitive_but_1_is_a_wrapper_object_Prefer_using_0_when_possible: diag(2692, DiagnosticCategory.Error, "_0_is_a_primitive_but_1_is_a_wrapper_object_Prefer_using_0_when_possible_2692", "'{0}' is a primitive, but '{1}' is a wrapper object. Prefer using '{0}' when possible."),
+        _0_only_refers_to_a_type_but_is_being_used_as_a_value_here: diag(2693, DiagnosticCategory.Error, "_0_only_refers_to_a_type_but_is_being_used_as_a_value_here_2693", "'{0}' only refers to a type, but is being used as a value here."),
+        Namespace_0_has_no_exported_member_1: diag(2694, DiagnosticCategory.Error, "Namespace_0_has_no_exported_member_1_2694", "Namespace '{0}' has no exported member '{1}'."),
+        Left_side_of_comma_operator_is_unused_and_has_no_side_effects: diag(2695, DiagnosticCategory.Error, "Left_side_of_comma_operator_is_unused_and_has_no_side_effects_2695", "Left side of comma operator is unused and has no side effects.", /*reportsUnnecessary*/ true),
+        The_Object_type_is_assignable_to_very_few_other_types_Did_you_mean_to_use_the_any_type_instead: diag(2696, DiagnosticCategory.Error, "The_Object_type_is_assignable_to_very_few_other_types_Did_you_mean_to_use_the_any_type_instead_2696", "The 'Object' type is assignable to very few other types. Did you mean to use the 'any' type instead?"),
+        An_async_function_or_method_must_return_a_Promise_Make_sure_you_have_a_declaration_for_Promise_or_include_ES2015_in_your_lib_option: diag(2697, DiagnosticCategory.Error, "An_async_function_or_method_must_return_a_Promise_Make_sure_you_have_a_declaration_for_Promise_or_in_2697", "An async function or method must return a 'Promise'. Make sure you have a declaration for 'Promise' or include 'ES2015' in your `--lib` option."),
+        Spread_types_may_only_be_created_from_object_types: diag(2698, DiagnosticCategory.Error, "Spread_types_may_only_be_created_from_object_types_2698", "Spread types may only be created from object types."),
+        Static_property_0_conflicts_with_built_in_property_Function_0_of_constructor_function_1: diag(2699, DiagnosticCategory.Error, "Static_property_0_conflicts_with_built_in_property_Function_0_of_constructor_function_1_2699", "Static property '{0}' conflicts with built-in property 'Function.{0}' of constructor function '{1}'."),
+        Rest_types_may_only_be_created_from_object_types: diag(2700, DiagnosticCategory.Error, "Rest_types_may_only_be_created_from_object_types_2700", "Rest types may only be created from object types."),
+        The_target_of_an_object_rest_assignment_must_be_a_variable_or_a_property_access: diag(2701, DiagnosticCategory.Error, "The_target_of_an_object_rest_assignment_must_be_a_variable_or_a_property_access_2701", "The target of an object rest assignment must be a variable or a property access."),
+        _0_only_refers_to_a_type_but_is_being_used_as_a_namespace_here: diag(2702, DiagnosticCategory.Error, "_0_only_refers_to_a_type_but_is_being_used_as_a_namespace_here_2702", "'{0}' only refers to a type, but is being used as a namespace here."),
+        The_operand_of_a_delete_operator_must_be_a_property_reference: diag(2703, DiagnosticCategory.Error, "The_operand_of_a_delete_operator_must_be_a_property_reference_2703", "The operand of a delete operator must be a property reference."),
+        The_operand_of_a_delete_operator_cannot_be_a_read_only_property: diag(2704, DiagnosticCategory.Error, "The_operand_of_a_delete_operator_cannot_be_a_read_only_property_2704", "The operand of a delete operator cannot be a read-only property."),
+        An_async_function_or_method_in_ES5_SlashES3_requires_the_Promise_constructor_Make_sure_you_have_a_declaration_for_the_Promise_constructor_or_include_ES2015_in_your_lib_option: diag(2705, DiagnosticCategory.Error, "An_async_function_or_method_in_ES5_SlashES3_requires_the_Promise_constructor_Make_sure_you_have_a_de_2705", "An async function or method in ES5/ES3 requires the 'Promise' constructor.  Make sure you have a declaration for the 'Promise' constructor or include 'ES2015' in your `--lib` option."),
+        Required_type_parameters_may_not_follow_optional_type_parameters: diag(2706, DiagnosticCategory.Error, "Required_type_parameters_may_not_follow_optional_type_parameters_2706", "Required type parameters may not follow optional type parameters."),
+        Generic_type_0_requires_between_1_and_2_type_arguments: diag(2707, DiagnosticCategory.Error, "Generic_type_0_requires_between_1_and_2_type_arguments_2707", "Generic type '{0}' requires between {1} and {2} type arguments."),
+        Cannot_use_namespace_0_as_a_value: diag(2708, DiagnosticCategory.Error, "Cannot_use_namespace_0_as_a_value_2708", "Cannot use namespace '{0}' as a value."),
+        Cannot_use_namespace_0_as_a_type: diag(2709, DiagnosticCategory.Error, "Cannot_use_namespace_0_as_a_type_2709", "Cannot use namespace '{0}' as a type."),
+        _0_are_specified_twice_The_attribute_named_0_will_be_overwritten: diag(2710, DiagnosticCategory.Error, "_0_are_specified_twice_The_attribute_named_0_will_be_overwritten_2710", "'{0}' are specified twice. The attribute named '{0}' will be overwritten."),
+        A_dynamic_import_call_returns_a_Promise_Make_sure_you_have_a_declaration_for_Promise_or_include_ES2015_in_your_lib_option: diag(2711, DiagnosticCategory.Error, "A_dynamic_import_call_returns_a_Promise_Make_sure_you_have_a_declaration_for_Promise_or_include_ES20_2711", "A dynamic import call returns a 'Promise'. Make sure you have a declaration for 'Promise' or include 'ES2015' in your `--lib` option."),
+        A_dynamic_import_call_in_ES5_SlashES3_requires_the_Promise_constructor_Make_sure_you_have_a_declaration_for_the_Promise_constructor_or_include_ES2015_in_your_lib_option: diag(2712, DiagnosticCategory.Error, "A_dynamic_import_call_in_ES5_SlashES3_requires_the_Promise_constructor_Make_sure_you_have_a_declarat_2712", "A dynamic import call in ES5/ES3 requires the 'Promise' constructor.  Make sure you have a declaration for the 'Promise' constructor or include 'ES2015' in your `--lib` option."),
+        Cannot_access_0_1_because_0_is_a_type_but_not_a_namespace_Did_you_mean_to_retrieve_the_type_of_the_property_1_in_0_with_0_1: diag(2713, DiagnosticCategory.Error, "Cannot_access_0_1_because_0_is_a_type_but_not_a_namespace_Did_you_mean_to_retrieve_the_type_of_the_p_2713", "Cannot access '{0}.{1}' because '{0}' is a type, but not a namespace. Did you mean to retrieve the type of the property '{1}' in '{0}' with '{0}[\"{1}\"]'?"),
+        The_expression_of_an_export_assignment_must_be_an_identifier_or_qualified_name_in_an_ambient_context: diag(2714, DiagnosticCategory.Error, "The_expression_of_an_export_assignment_must_be_an_identifier_or_qualified_name_in_an_ambient_context_2714", "The expression of an export assignment must be an identifier or qualified name in an ambient context."),
+        Abstract_property_0_in_class_1_cannot_be_accessed_in_the_constructor: diag(2715, DiagnosticCategory.Error, "Abstract_property_0_in_class_1_cannot_be_accessed_in_the_constructor_2715", "Abstract property '{0}' in class '{1}' cannot be accessed in the constructor."),
+        Type_parameter_0_has_a_circular_default: diag(2716, DiagnosticCategory.Error, "Type_parameter_0_has_a_circular_default_2716", "Type parameter '{0}' has a circular default."),
+        Subsequent_property_declarations_must_have_the_same_type_Property_0_must_be_of_type_1_but_here_has_type_2: diag(2717, DiagnosticCategory.Error, "Subsequent_property_declarations_must_have_the_same_type_Property_0_must_be_of_type_1_but_here_has_t_2717", "Subsequent property declarations must have the same type.  Property '{0}' must be of type '{1}', but here has type '{2}'."),
+        Duplicate_declaration_0: diag(2718, DiagnosticCategory.Error, "Duplicate_declaration_0_2718", "Duplicate declaration '{0}'."),
+        Type_0_is_not_assignable_to_type_1_Two_different_types_with_this_name_exist_but_they_are_unrelated: diag(2719, DiagnosticCategory.Error, "Type_0_is_not_assignable_to_type_1_Two_different_types_with_this_name_exist_but_they_are_unrelated_2719", "Type '{0}' is not assignable to type '{1}'. Two different types with this name exist, but they are unrelated."),
+        Class_0_incorrectly_implements_class_1_Did_you_mean_to_extend_1_and_inherit_its_members_as_a_subclass: diag(2720, DiagnosticCategory.Error, "Class_0_incorrectly_implements_class_1_Did_you_mean_to_extend_1_and_inherit_its_members_as_a_subclas_2720", "Class '{0}' incorrectly implements class '{1}'. Did you mean to extend '{1}' and inherit its members as a subclass?"),
+        Cannot_invoke_an_object_which_is_possibly_null: diag(2721, DiagnosticCategory.Error, "Cannot_invoke_an_object_which_is_possibly_null_2721", "Cannot invoke an object which is possibly 'null'."),
+        Cannot_invoke_an_object_which_is_possibly_undefined: diag(2722, DiagnosticCategory.Error, "Cannot_invoke_an_object_which_is_possibly_undefined_2722", "Cannot invoke an object which is possibly 'undefined'."),
+        Cannot_invoke_an_object_which_is_possibly_null_or_undefined: diag(2723, DiagnosticCategory.Error, "Cannot_invoke_an_object_which_is_possibly_null_or_undefined_2723", "Cannot invoke an object which is possibly 'null' or 'undefined'."),
+        Module_0_has_no_exported_member_1_Did_you_mean_2: diag(2724, DiagnosticCategory.Error, "Module_0_has_no_exported_member_1_Did_you_mean_2_2724", "Module '{0}' has no exported member '{1}'. Did you mean '{2}'?"),
+        Class_name_cannot_be_Object_when_targeting_ES5_with_module_0: diag(2725, DiagnosticCategory.Error, "Class_name_cannot_be_Object_when_targeting_ES5_with_module_0_2725", "Class name cannot be 'Object' when targeting ES5 with module {0}."),
+        Cannot_find_lib_definition_for_0: diag(2726, DiagnosticCategory.Error, "Cannot_find_lib_definition_for_0_2726", "Cannot find lib definition for '{0}'."),
+        Cannot_find_lib_definition_for_0_Did_you_mean_1: diag(2727, DiagnosticCategory.Error, "Cannot_find_lib_definition_for_0_Did_you_mean_1_2727", "Cannot find lib definition for '{0}'. Did you mean '{1}'?"),
+        Import_declaration_0_is_using_private_name_1: diag(4000, DiagnosticCategory.Error, "Import_declaration_0_is_using_private_name_1_4000", "Import declaration '{0}' is using private name '{1}'."),
+        Type_parameter_0_of_exported_class_has_or_is_using_private_name_1: diag(4002, DiagnosticCategory.Error, "Type_parameter_0_of_exported_class_has_or_is_using_private_name_1_4002", "Type parameter '{0}' of exported class has or is using private name '{1}'."),
+        Type_parameter_0_of_exported_interface_has_or_is_using_private_name_1: diag(4004, DiagnosticCategory.Error, "Type_parameter_0_of_exported_interface_has_or_is_using_private_name_1_4004", "Type parameter '{0}' of exported interface has or is using private name '{1}'."),
+        Type_parameter_0_of_constructor_signature_from_exported_interface_has_or_is_using_private_name_1: diag(4006, DiagnosticCategory.Error, "Type_parameter_0_of_constructor_signature_from_exported_interface_has_or_is_using_private_name_1_4006", "Type parameter '{0}' of constructor signature from exported interface has or is using private name '{1}'."),
+        Type_parameter_0_of_call_signature_from_exported_interface_has_or_is_using_private_name_1: diag(4008, DiagnosticCategory.Error, "Type_parameter_0_of_call_signature_from_exported_interface_has_or_is_using_private_name_1_4008", "Type parameter '{0}' of call signature from exported interface has or is using private name '{1}'."),
+        Type_parameter_0_of_public_static_method_from_exported_class_has_or_is_using_private_name_1: diag(4010, DiagnosticCategory.Error, "Type_parameter_0_of_public_static_method_from_exported_class_has_or_is_using_private_name_1_4010", "Type parameter '{0}' of public static method from exported class has or is using private name '{1}'."),
+        Type_parameter_0_of_public_method_from_exported_class_has_or_is_using_private_name_1: diag(4012, DiagnosticCategory.Error, "Type_parameter_0_of_public_method_from_exported_class_has_or_is_using_private_name_1_4012", "Type parameter '{0}' of public method from exported class has or is using private name '{1}'."),
+        Type_parameter_0_of_method_from_exported_interface_has_or_is_using_private_name_1: diag(4014, DiagnosticCategory.Error, "Type_parameter_0_of_method_from_exported_interface_has_or_is_using_private_name_1_4014", "Type parameter '{0}' of method from exported interface has or is using private name '{1}'."),
+        Type_parameter_0_of_exported_function_has_or_is_using_private_name_1: diag(4016, DiagnosticCategory.Error, "Type_parameter_0_of_exported_function_has_or_is_using_private_name_1_4016", "Type parameter '{0}' of exported function has or is using private name '{1}'."),
+        Implements_clause_of_exported_class_0_has_or_is_using_private_name_1: diag(4019, DiagnosticCategory.Error, "Implements_clause_of_exported_class_0_has_or_is_using_private_name_1_4019", "Implements clause of exported class '{0}' has or is using private name '{1}'."),
+        extends_clause_of_exported_class_0_has_or_is_using_private_name_1: diag(4020, DiagnosticCategory.Error, "extends_clause_of_exported_class_0_has_or_is_using_private_name_1_4020", "'extends' clause of exported class '{0}' has or is using private name '{1}'."),
+        extends_clause_of_exported_interface_0_has_or_is_using_private_name_1: diag(4022, DiagnosticCategory.Error, "extends_clause_of_exported_interface_0_has_or_is_using_private_name_1_4022", "'extends' clause of exported interface '{0}' has or is using private name '{1}'."),
+        Exported_variable_0_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: diag(4023, DiagnosticCategory.Error, "Exported_variable_0_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named_4023", "Exported variable '{0}' has or is using name '{1}' from external module {2} but cannot be named."),
+        Exported_variable_0_has_or_is_using_name_1_from_private_module_2: diag(4024, DiagnosticCategory.Error, "Exported_variable_0_has_or_is_using_name_1_from_private_module_2_4024", "Exported variable '{0}' has or is using name '{1}' from private module '{2}'."),
+        Exported_variable_0_has_or_is_using_private_name_1: diag(4025, DiagnosticCategory.Error, "Exported_variable_0_has_or_is_using_private_name_1_4025", "Exported variable '{0}' has or is using private name '{1}'."),
+        Public_static_property_0_of_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: diag(4026, DiagnosticCategory.Error, "Public_static_property_0_of_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot__4026", "Public static property '{0}' of exported class has or is using name '{1}' from external module {2} but cannot be named."),
+        Public_static_property_0_of_exported_class_has_or_is_using_name_1_from_private_module_2: diag(4027, DiagnosticCategory.Error, "Public_static_property_0_of_exported_class_has_or_is_using_name_1_from_private_module_2_4027", "Public static property '{0}' of exported class has or is using name '{1}' from private module '{2}'."),
+        Public_static_property_0_of_exported_class_has_or_is_using_private_name_1: diag(4028, DiagnosticCategory.Error, "Public_static_property_0_of_exported_class_has_or_is_using_private_name_1_4028", "Public static property '{0}' of exported class has or is using private name '{1}'."),
+        Public_property_0_of_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: diag(4029, DiagnosticCategory.Error, "Public_property_0_of_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_name_4029", "Public property '{0}' of exported class has or is using name '{1}' from external module {2} but cannot be named."),
+        Public_property_0_of_exported_class_has_or_is_using_name_1_from_private_module_2: diag(4030, DiagnosticCategory.Error, "Public_property_0_of_exported_class_has_or_is_using_name_1_from_private_module_2_4030", "Public property '{0}' of exported class has or is using name '{1}' from private module '{2}'."),
+        Public_property_0_of_exported_class_has_or_is_using_private_name_1: diag(4031, DiagnosticCategory.Error, "Public_property_0_of_exported_class_has_or_is_using_private_name_1_4031", "Public property '{0}' of exported class has or is using private name '{1}'."),
+        Property_0_of_exported_interface_has_or_is_using_name_1_from_private_module_2: diag(4032, DiagnosticCategory.Error, "Property_0_of_exported_interface_has_or_is_using_name_1_from_private_module_2_4032", "Property '{0}' of exported interface has or is using name '{1}' from private module '{2}'."),
+        Property_0_of_exported_interface_has_or_is_using_private_name_1: diag(4033, DiagnosticCategory.Error, "Property_0_of_exported_interface_has_or_is_using_private_name_1_4033", "Property '{0}' of exported interface has or is using private name '{1}'."),
+        Parameter_type_of_public_static_setter_0_from_exported_class_has_or_is_using_name_1_from_private_module_2: diag(4034, DiagnosticCategory.Error, "Parameter_type_of_public_static_setter_0_from_exported_class_has_or_is_using_name_1_from_private_mod_4034", "Parameter type of public static setter '{0}' from exported class has or is using name '{1}' from private module '{2}'."),
+        Parameter_type_of_public_static_setter_0_from_exported_class_has_or_is_using_private_name_1: diag(4035, DiagnosticCategory.Error, "Parameter_type_of_public_static_setter_0_from_exported_class_has_or_is_using_private_name_1_4035", "Parameter type of public static setter '{0}' from exported class has or is using private name '{1}'."),
+        Parameter_type_of_public_setter_0_from_exported_class_has_or_is_using_name_1_from_private_module_2: diag(4036, DiagnosticCategory.Error, "Parameter_type_of_public_setter_0_from_exported_class_has_or_is_using_name_1_from_private_module_2_4036", "Parameter type of public setter '{0}' from exported class has or is using name '{1}' from private module '{2}'."),
+        Parameter_type_of_public_setter_0_from_exported_class_has_or_is_using_private_name_1: diag(4037, DiagnosticCategory.Error, "Parameter_type_of_public_setter_0_from_exported_class_has_or_is_using_private_name_1_4037", "Parameter type of public setter '{0}' from exported class has or is using private name '{1}'."),
+        Return_type_of_public_static_getter_0_from_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: diag(4038, DiagnosticCategory.Error, "Return_type_of_public_static_getter_0_from_exported_class_has_or_is_using_name_1_from_external_modul_4038", "Return type of public static getter '{0}' from exported class has or is using name '{1}' from external module {2} but cannot be named."),
+        Return_type_of_public_static_getter_0_from_exported_class_has_or_is_using_name_1_from_private_module_2: diag(4039, DiagnosticCategory.Error, "Return_type_of_public_static_getter_0_from_exported_class_has_or_is_using_name_1_from_private_module_4039", "Return type of public static getter '{0}' from exported class has or is using name '{1}' from private module '{2}'."),
+        Return_type_of_public_static_getter_0_from_exported_class_has_or_is_using_private_name_1: diag(4040, DiagnosticCategory.Error, "Return_type_of_public_static_getter_0_from_exported_class_has_or_is_using_private_name_1_4040", "Return type of public static getter '{0}' from exported class has or is using private name '{1}'."),
+        Return_type_of_public_getter_0_from_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: diag(4041, DiagnosticCategory.Error, "Return_type_of_public_getter_0_from_exported_class_has_or_is_using_name_1_from_external_module_2_but_4041", "Return type of public getter '{0}' from exported class has or is using name '{1}' from external module {2} but cannot be named."),
+        Return_type_of_public_getter_0_from_exported_class_has_or_is_using_name_1_from_private_module_2: diag(4042, DiagnosticCategory.Error, "Return_type_of_public_getter_0_from_exported_class_has_or_is_using_name_1_from_private_module_2_4042", "Return type of public getter '{0}' from exported class has or is using name '{1}' from private module '{2}'."),
+        Return_type_of_public_getter_0_from_exported_class_has_or_is_using_private_name_1: diag(4043, DiagnosticCategory.Error, "Return_type_of_public_getter_0_from_exported_class_has_or_is_using_private_name_1_4043", "Return type of public getter '{0}' from exported class has or is using private name '{1}'."),
+        Return_type_of_constructor_signature_from_exported_interface_has_or_is_using_name_0_from_private_module_1: diag(4044, DiagnosticCategory.Error, "Return_type_of_constructor_signature_from_exported_interface_has_or_is_using_name_0_from_private_mod_4044", "Return type of constructor signature from exported interface has or is using name '{0}' from private module '{1}'."),
+        Return_type_of_constructor_signature_from_exported_interface_has_or_is_using_private_name_0: diag(4045, DiagnosticCategory.Error, "Return_type_of_constructor_signature_from_exported_interface_has_or_is_using_private_name_0_4045", "Return type of constructor signature from exported interface has or is using private name '{0}'."),
+        Return_type_of_call_signature_from_exported_interface_has_or_is_using_name_0_from_private_module_1: diag(4046, DiagnosticCategory.Error, "Return_type_of_call_signature_from_exported_interface_has_or_is_using_name_0_from_private_module_1_4046", "Return type of call signature from exported interface has or is using name '{0}' from private module '{1}'."),
+        Return_type_of_call_signature_from_exported_interface_has_or_is_using_private_name_0: diag(4047, DiagnosticCategory.Error, "Return_type_of_call_signature_from_exported_interface_has_or_is_using_private_name_0_4047", "Return type of call signature from exported interface has or is using private name '{0}'."),
+        Return_type_of_index_signature_from_exported_interface_has_or_is_using_name_0_from_private_module_1: diag(4048, DiagnosticCategory.Error, "Return_type_of_index_signature_from_exported_interface_has_or_is_using_name_0_from_private_module_1_4048", "Return type of index signature from exported interface has or is using name '{0}' from private module '{1}'."),
+        Return_type_of_index_signature_from_exported_interface_has_or_is_using_private_name_0: diag(4049, DiagnosticCategory.Error, "Return_type_of_index_signature_from_exported_interface_has_or_is_using_private_name_0_4049", "Return type of index signature from exported interface has or is using private name '{0}'."),
+        Return_type_of_public_static_method_from_exported_class_has_or_is_using_name_0_from_external_module_1_but_cannot_be_named: diag(4050, DiagnosticCategory.Error, "Return_type_of_public_static_method_from_exported_class_has_or_is_using_name_0_from_external_module__4050", "Return type of public static method from exported class has or is using name '{0}' from external module {1} but cannot be named."),
+        Return_type_of_public_static_method_from_exported_class_has_or_is_using_name_0_from_private_module_1: diag(4051, DiagnosticCategory.Error, "Return_type_of_public_static_method_from_exported_class_has_or_is_using_name_0_from_private_module_1_4051", "Return type of public static method from exported class has or is using name '{0}' from private module '{1}'."),
+        Return_type_of_public_static_method_from_exported_class_has_or_is_using_private_name_0: diag(4052, DiagnosticCategory.Error, "Return_type_of_public_static_method_from_exported_class_has_or_is_using_private_name_0_4052", "Return type of public static method from exported class has or is using private name '{0}'."),
+        Return_type_of_public_method_from_exported_class_has_or_is_using_name_0_from_external_module_1_but_cannot_be_named: diag(4053, DiagnosticCategory.Error, "Return_type_of_public_method_from_exported_class_has_or_is_using_name_0_from_external_module_1_but_c_4053", "Return type of public method from exported class has or is using name '{0}' from external module {1} but cannot be named."),
+        Return_type_of_public_method_from_exported_class_has_or_is_using_name_0_from_private_module_1: diag(4054, DiagnosticCategory.Error, "Return_type_of_public_method_from_exported_class_has_or_is_using_name_0_from_private_module_1_4054", "Return type of public method from exported class has or is using name '{0}' from private module '{1}'."),
+        Return_type_of_public_method_from_exported_class_has_or_is_using_private_name_0: diag(4055, DiagnosticCategory.Error, "Return_type_of_public_method_from_exported_class_has_or_is_using_private_name_0_4055", "Return type of public method from exported class has or is using private name '{0}'."),
+        Return_type_of_method_from_exported_interface_has_or_is_using_name_0_from_private_module_1: diag(4056, DiagnosticCategory.Error, "Return_type_of_method_from_exported_interface_has_or_is_using_name_0_from_private_module_1_4056", "Return type of method from exported interface has or is using name '{0}' from private module '{1}'."),
+        Return_type_of_method_from_exported_interface_has_or_is_using_private_name_0: diag(4057, DiagnosticCategory.Error, "Return_type_of_method_from_exported_interface_has_or_is_using_private_name_0_4057", "Return type of method from exported interface has or is using private name '{0}'."),
+        Return_type_of_exported_function_has_or_is_using_name_0_from_external_module_1_but_cannot_be_named: diag(4058, DiagnosticCategory.Error, "Return_type_of_exported_function_has_or_is_using_name_0_from_external_module_1_but_cannot_be_named_4058", "Return type of exported function has or is using name '{0}' from external module {1} but cannot be named."),
+        Return_type_of_exported_function_has_or_is_using_name_0_from_private_module_1: diag(4059, DiagnosticCategory.Error, "Return_type_of_exported_function_has_or_is_using_name_0_from_private_module_1_4059", "Return type of exported function has or is using name '{0}' from private module '{1}'."),
+        Return_type_of_exported_function_has_or_is_using_private_name_0: diag(4060, DiagnosticCategory.Error, "Return_type_of_exported_function_has_or_is_using_private_name_0_4060", "Return type of exported function has or is using private name '{0}'."),
+        Parameter_0_of_constructor_from_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: diag(4061, DiagnosticCategory.Error, "Parameter_0_of_constructor_from_exported_class_has_or_is_using_name_1_from_external_module_2_but_can_4061", "Parameter '{0}' of constructor from exported class has or is using name '{1}' from external module {2} but cannot be named."),
+        Parameter_0_of_constructor_from_exported_class_has_or_is_using_name_1_from_private_module_2: diag(4062, DiagnosticCategory.Error, "Parameter_0_of_constructor_from_exported_class_has_or_is_using_name_1_from_private_module_2_4062", "Parameter '{0}' of constructor from exported class has or is using name '{1}' from private module '{2}'."),
+        Parameter_0_of_constructor_from_exported_class_has_or_is_using_private_name_1: diag(4063, DiagnosticCategory.Error, "Parameter_0_of_constructor_from_exported_class_has_or_is_using_private_name_1_4063", "Parameter '{0}' of constructor from exported class has or is using private name '{1}'."),
+        Parameter_0_of_constructor_signature_from_exported_interface_has_or_is_using_name_1_from_private_module_2: diag(4064, DiagnosticCategory.Error, "Parameter_0_of_constructor_signature_from_exported_interface_has_or_is_using_name_1_from_private_mod_4064", "Parameter '{0}' of constructor signature from exported interface has or is using name '{1}' from private module '{2}'."),
+        Parameter_0_of_constructor_signature_from_exported_interface_has_or_is_using_private_name_1: diag(4065, DiagnosticCategory.Error, "Parameter_0_of_constructor_signature_from_exported_interface_has_or_is_using_private_name_1_4065", "Parameter '{0}' of constructor signature from exported interface has or is using private name '{1}'."),
+        Parameter_0_of_call_signature_from_exported_interface_has_or_is_using_name_1_from_private_module_2: diag(4066, DiagnosticCategory.Error, "Parameter_0_of_call_signature_from_exported_interface_has_or_is_using_name_1_from_private_module_2_4066", "Parameter '{0}' of call signature from exported interface has or is using name '{1}' from private module '{2}'."),
+        Parameter_0_of_call_signature_from_exported_interface_has_or_is_using_private_name_1: diag(4067, DiagnosticCategory.Error, "Parameter_0_of_call_signature_from_exported_interface_has_or_is_using_private_name_1_4067", "Parameter '{0}' of call signature from exported interface has or is using private name '{1}'."),
+        Parameter_0_of_public_static_method_from_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: diag(4068, DiagnosticCategory.Error, "Parameter_0_of_public_static_method_from_exported_class_has_or_is_using_name_1_from_external_module__4068", "Parameter '{0}' of public static method from exported class has or is using name '{1}' from external module {2} but cannot be named."),
+        Parameter_0_of_public_static_method_from_exported_class_has_or_is_using_name_1_from_private_module_2: diag(4069, DiagnosticCategory.Error, "Parameter_0_of_public_static_method_from_exported_class_has_or_is_using_name_1_from_private_module_2_4069", "Parameter '{0}' of public static method from exported class has or is using name '{1}' from private module '{2}'."),
+        Parameter_0_of_public_static_method_from_exported_class_has_or_is_using_private_name_1: diag(4070, DiagnosticCategory.Error, "Parameter_0_of_public_static_method_from_exported_class_has_or_is_using_private_name_1_4070", "Parameter '{0}' of public static method from exported class has or is using private name '{1}'."),
+        Parameter_0_of_public_method_from_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: diag(4071, DiagnosticCategory.Error, "Parameter_0_of_public_method_from_exported_class_has_or_is_using_name_1_from_external_module_2_but_c_4071", "Parameter '{0}' of public method from exported class has or is using name '{1}' from external module {2} but cannot be named."),
+        Parameter_0_of_public_method_from_exported_class_has_or_is_using_name_1_from_private_module_2: diag(4072, DiagnosticCategory.Error, "Parameter_0_of_public_method_from_exported_class_has_or_is_using_name_1_from_private_module_2_4072", "Parameter '{0}' of public method from exported class has or is using name '{1}' from private module '{2}'."),
+        Parameter_0_of_public_method_from_exported_class_has_or_is_using_private_name_1: diag(4073, DiagnosticCategory.Error, "Parameter_0_of_public_method_from_exported_class_has_or_is_using_private_name_1_4073", "Parameter '{0}' of public method from exported class has or is using private name '{1}'."),
+        Parameter_0_of_method_from_exported_interface_has_or_is_using_name_1_from_private_module_2: diag(4074, DiagnosticCategory.Error, "Parameter_0_of_method_from_exported_interface_has_or_is_using_name_1_from_private_module_2_4074", "Parameter '{0}' of method from exported interface has or is using name '{1}' from private module '{2}'."),
+        Parameter_0_of_method_from_exported_interface_has_or_is_using_private_name_1: diag(4075, DiagnosticCategory.Error, "Parameter_0_of_method_from_exported_interface_has_or_is_using_private_name_1_4075", "Parameter '{0}' of method from exported interface has or is using private name '{1}'."),
+        Parameter_0_of_exported_function_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: diag(4076, DiagnosticCategory.Error, "Parameter_0_of_exported_function_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named_4076", "Parameter '{0}' of exported function has or is using name '{1}' from external module {2} but cannot be named."),
+        Parameter_0_of_exported_function_has_or_is_using_name_1_from_private_module_2: diag(4077, DiagnosticCategory.Error, "Parameter_0_of_exported_function_has_or_is_using_name_1_from_private_module_2_4077", "Parameter '{0}' of exported function has or is using name '{1}' from private module '{2}'."),
+        Parameter_0_of_exported_function_has_or_is_using_private_name_1: diag(4078, DiagnosticCategory.Error, "Parameter_0_of_exported_function_has_or_is_using_private_name_1_4078", "Parameter '{0}' of exported function has or is using private name '{1}'."),
+        Exported_type_alias_0_has_or_is_using_private_name_1: diag(4081, DiagnosticCategory.Error, "Exported_type_alias_0_has_or_is_using_private_name_1_4081", "Exported type alias '{0}' has or is using private name '{1}'."),
+        Default_export_of_the_module_has_or_is_using_private_name_0: diag(4082, DiagnosticCategory.Error, "Default_export_of_the_module_has_or_is_using_private_name_0_4082", "Default export of the module has or is using private name '{0}'."),
+        Type_parameter_0_of_exported_type_alias_has_or_is_using_private_name_1: diag(4083, DiagnosticCategory.Error, "Type_parameter_0_of_exported_type_alias_has_or_is_using_private_name_1_4083", "Type parameter '{0}' of exported type alias has or is using private name '{1}'."),
+        Conflicting_definitions_for_0_found_at_1_and_2_Consider_installing_a_specific_version_of_this_library_to_resolve_the_conflict: diag(4090, DiagnosticCategory.Error, "Conflicting_definitions_for_0_found_at_1_and_2_Consider_installing_a_specific_version_of_this_librar_4090", "Conflicting definitions for '{0}' found at '{1}' and '{2}'. Consider installing a specific version of this library to resolve the conflict."),
+        Parameter_0_of_index_signature_from_exported_interface_has_or_is_using_name_1_from_private_module_2: diag(4091, DiagnosticCategory.Error, "Parameter_0_of_index_signature_from_exported_interface_has_or_is_using_name_1_from_private_module_2_4091", "Parameter '{0}' of index signature from exported interface has or is using name '{1}' from private module '{2}'."),
+        Parameter_0_of_index_signature_from_exported_interface_has_or_is_using_private_name_1: diag(4092, DiagnosticCategory.Error, "Parameter_0_of_index_signature_from_exported_interface_has_or_is_using_private_name_1_4092", "Parameter '{0}' of index signature from exported interface has or is using private name '{1}'."),
+        Property_0_of_exported_class_expression_may_not_be_private_or_protected: diag(4094, DiagnosticCategory.Error, "Property_0_of_exported_class_expression_may_not_be_private_or_protected_4094", "Property '{0}' of exported class expression may not be private or protected."),
+        Public_static_method_0_of_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: diag(4095, DiagnosticCategory.Error, "Public_static_method_0_of_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_4095", "Public static method '{0}' of exported class has or is using name '{1}' from external module {2} but cannot be named."),
+        Public_static_method_0_of_exported_class_has_or_is_using_name_1_from_private_module_2: diag(4096, DiagnosticCategory.Error, "Public_static_method_0_of_exported_class_has_or_is_using_name_1_from_private_module_2_4096", "Public static method '{0}' of exported class has or is using name '{1}' from private module '{2}'."),
+        Public_static_method_0_of_exported_class_has_or_is_using_private_name_1: diag(4097, DiagnosticCategory.Error, "Public_static_method_0_of_exported_class_has_or_is_using_private_name_1_4097", "Public static method '{0}' of exported class has or is using private name '{1}'."),
+        Public_method_0_of_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: diag(4098, DiagnosticCategory.Error, "Public_method_0_of_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named_4098", "Public method '{0}' of exported class has or is using name '{1}' from external module {2} but cannot be named."),
+        Public_method_0_of_exported_class_has_or_is_using_name_1_from_private_module_2: diag(4099, DiagnosticCategory.Error, "Public_method_0_of_exported_class_has_or_is_using_name_1_from_private_module_2_4099", "Public method '{0}' of exported class has or is using name '{1}' from private module '{2}'."),
+        Public_method_0_of_exported_class_has_or_is_using_private_name_1: diag(4100, DiagnosticCategory.Error, "Public_method_0_of_exported_class_has_or_is_using_private_name_1_4100", "Public method '{0}' of exported class has or is using private name '{1}'."),
+        Method_0_of_exported_interface_has_or_is_using_name_1_from_private_module_2: diag(4101, DiagnosticCategory.Error, "Method_0_of_exported_interface_has_or_is_using_name_1_from_private_module_2_4101", "Method '{0}' of exported interface has or is using name '{1}' from private module '{2}'."),
+        Method_0_of_exported_interface_has_or_is_using_private_name_1: diag(4102, DiagnosticCategory.Error, "Method_0_of_exported_interface_has_or_is_using_private_name_1_4102", "Method '{0}' of exported interface has or is using private name '{1}'."),
+        The_current_host_does_not_support_the_0_option: diag(5001, DiagnosticCategory.Error, "The_current_host_does_not_support_the_0_option_5001", "The current host does not support the '{0}' option."),
+        Cannot_find_the_common_subdirectory_path_for_the_input_files: diag(5009, DiagnosticCategory.Error, "Cannot_find_the_common_subdirectory_path_for_the_input_files_5009", "Cannot find the common subdirectory path for the input files."),
+        File_specification_cannot_end_in_a_recursive_directory_wildcard_Asterisk_Asterisk_Colon_0: diag(5010, DiagnosticCategory.Error, "File_specification_cannot_end_in_a_recursive_directory_wildcard_Asterisk_Asterisk_Colon_0_5010", "File specification cannot end in a recursive directory wildcard ('**'): '{0}'."),
+        Cannot_read_file_0_Colon_1: diag(5012, DiagnosticCategory.Error, "Cannot_read_file_0_Colon_1_5012", "Cannot read file '{0}': {1}."),
+        Failed_to_parse_file_0_Colon_1: diag(5014, DiagnosticCategory.Error, "Failed_to_parse_file_0_Colon_1_5014", "Failed to parse file '{0}': {1}."),
+        Unknown_compiler_option_0: diag(5023, DiagnosticCategory.Error, "Unknown_compiler_option_0_5023", "Unknown compiler option '{0}'."),
+        Compiler_option_0_requires_a_value_of_type_1: diag(5024, DiagnosticCategory.Error, "Compiler_option_0_requires_a_value_of_type_1_5024", "Compiler option '{0}' requires a value of type {1}."),
+        Could_not_write_file_0_Colon_1: diag(5033, DiagnosticCategory.Error, "Could_not_write_file_0_Colon_1_5033", "Could not write file '{0}': {1}."),
+        Option_project_cannot_be_mixed_with_source_files_on_a_command_line: diag(5042, DiagnosticCategory.Error, "Option_project_cannot_be_mixed_with_source_files_on_a_command_line_5042", "Option 'project' cannot be mixed with source files on a command line."),
+        Option_isolatedModules_can_only_be_used_when_either_option_module_is_provided_or_option_target_is_ES2015_or_higher: diag(5047, DiagnosticCategory.Error, "Option_isolatedModules_can_only_be_used_when_either_option_module_is_provided_or_option_target_is_ES_5047", "Option 'isolatedModules' can only be used when either option '--module' is provided or option 'target' is 'ES2015' or higher."),
+        Option_0_can_only_be_used_when_either_option_inlineSourceMap_or_option_sourceMap_is_provided: diag(5051, DiagnosticCategory.Error, "Option_0_can_only_be_used_when_either_option_inlineSourceMap_or_option_sourceMap_is_provided_5051", "Option '{0} can only be used when either option '--inlineSourceMap' or option '--sourceMap' is provided."),
+        Option_0_cannot_be_specified_without_specifying_option_1: diag(5052, DiagnosticCategory.Error, "Option_0_cannot_be_specified_without_specifying_option_1_5052", "Option '{0}' cannot be specified without specifying option '{1}'."),
+        Option_0_cannot_be_specified_with_option_1: diag(5053, DiagnosticCategory.Error, "Option_0_cannot_be_specified_with_option_1_5053", "Option '{0}' cannot be specified with option '{1}'."),
+        A_tsconfig_json_file_is_already_defined_at_Colon_0: diag(5054, DiagnosticCategory.Error, "A_tsconfig_json_file_is_already_defined_at_Colon_0_5054", "A 'tsconfig.json' file is already defined at: '{0}'."),
+        Cannot_write_file_0_because_it_would_overwrite_input_file: diag(5055, DiagnosticCategory.Error, "Cannot_write_file_0_because_it_would_overwrite_input_file_5055", "Cannot write file '{0}' because it would overwrite input file."),
+        Cannot_write_file_0_because_it_would_be_overwritten_by_multiple_input_files: diag(5056, DiagnosticCategory.Error, "Cannot_write_file_0_because_it_would_be_overwritten_by_multiple_input_files_5056", "Cannot write file '{0}' because it would be overwritten by multiple input files."),
+        Cannot_find_a_tsconfig_json_file_at_the_specified_directory_Colon_0: diag(5057, DiagnosticCategory.Error, "Cannot_find_a_tsconfig_json_file_at_the_specified_directory_Colon_0_5057", "Cannot find a tsconfig.json file at the specified directory: '{0}'."),
+        The_specified_path_does_not_exist_Colon_0: diag(5058, DiagnosticCategory.Error, "The_specified_path_does_not_exist_Colon_0_5058", "The specified path does not exist: '{0}'."),
+        Invalid_value_for_reactNamespace_0_is_not_a_valid_identifier: diag(5059, DiagnosticCategory.Error, "Invalid_value_for_reactNamespace_0_is_not_a_valid_identifier_5059", "Invalid value for '--reactNamespace'. '{0}' is not a valid identifier."),
+        Option_paths_cannot_be_used_without_specifying_baseUrl_option: diag(5060, DiagnosticCategory.Error, "Option_paths_cannot_be_used_without_specifying_baseUrl_option_5060", "Option 'paths' cannot be used without specifying '--baseUrl' option."),
+        Pattern_0_can_have_at_most_one_Asterisk_character: diag(5061, DiagnosticCategory.Error, "Pattern_0_can_have_at_most_one_Asterisk_character_5061", "Pattern '{0}' can have at most one '*' character."),
+        Substitution_0_in_pattern_1_in_can_have_at_most_one_Asterisk_character: diag(5062, DiagnosticCategory.Error, "Substitution_0_in_pattern_1_in_can_have_at_most_one_Asterisk_character_5062", "Substitution '{0}' in pattern '{1}' in can have at most one '*' character."),
+        Substitutions_for_pattern_0_should_be_an_array: diag(5063, DiagnosticCategory.Error, "Substitutions_for_pattern_0_should_be_an_array_5063", "Substitutions for pattern '{0}' should be an array."),
+        Substitution_0_for_pattern_1_has_incorrect_type_expected_string_got_2: diag(5064, DiagnosticCategory.Error, "Substitution_0_for_pattern_1_has_incorrect_type_expected_string_got_2_5064", "Substitution '{0}' for pattern '{1}' has incorrect type, expected 'string', got '{2}'."),
+        File_specification_cannot_contain_a_parent_directory_that_appears_after_a_recursive_directory_wildcard_Asterisk_Asterisk_Colon_0: diag(5065, DiagnosticCategory.Error, "File_specification_cannot_contain_a_parent_directory_that_appears_after_a_recursive_directory_wildca_5065", "File specification cannot contain a parent directory ('..') that appears after a recursive directory wildcard ('**'): '{0}'."),
+        Substitutions_for_pattern_0_shouldn_t_be_an_empty_array: diag(5066, DiagnosticCategory.Error, "Substitutions_for_pattern_0_shouldn_t_be_an_empty_array_5066", "Substitutions for pattern '{0}' shouldn't be an empty array."),
+        Invalid_value_for_jsxFactory_0_is_not_a_valid_identifier_or_qualified_name: diag(5067, DiagnosticCategory.Error, "Invalid_value_for_jsxFactory_0_is_not_a_valid_identifier_or_qualified_name_5067", "Invalid value for 'jsxFactory'. '{0}' is not a valid identifier or qualified-name."),
+        Adding_a_tsconfig_json_file_will_help_organize_projects_that_contain_both_TypeScript_and_JavaScript_files_Learn_more_at_https_Colon_Slash_Slashaka_ms_Slashtsconfig: diag(5068, DiagnosticCategory.Error, "Adding_a_tsconfig_json_file_will_help_organize_projects_that_contain_both_TypeScript_and_JavaScript__5068", "Adding a tsconfig.json file will help organize projects that contain both TypeScript and JavaScript files. Learn more at https://aka.ms/tsconfig."),
+        Option_0_cannot_be_specified_without_specifying_option_1_or_option_2: diag(5069, DiagnosticCategory.Error, "Option_0_cannot_be_specified_without_specifying_option_1_or_option_2_5069", "Option '{0}' cannot be specified without specifying option '{1}' or option '{2}'."),
+        Option_resolveJsonModule_cannot_be_specified_without_node_module_resolution_strategy: diag(5070, DiagnosticCategory.Error, "Option_resolveJsonModule_cannot_be_specified_without_node_module_resolution_strategy_5070", "Option '--resolveJsonModule' cannot be specified without 'node' module resolution strategy."),
+        Generates_a_sourcemap_for_each_corresponding_d_ts_file: diag(6000, DiagnosticCategory.Message, "Generates_a_sourcemap_for_each_corresponding_d_ts_file_6000", "Generates a sourcemap for each corresponding '.d.ts' file."),
+        Concatenate_and_emit_output_to_single_file: diag(6001, DiagnosticCategory.Message, "Concatenate_and_emit_output_to_single_file_6001", "Concatenate and emit output to single file."),
+        Generates_corresponding_d_ts_file: diag(6002, DiagnosticCategory.Message, "Generates_corresponding_d_ts_file_6002", "Generates corresponding '.d.ts' file."),
+        Specify_the_location_where_debugger_should_locate_map_files_instead_of_generated_locations: diag(6003, DiagnosticCategory.Message, "Specify_the_location_where_debugger_should_locate_map_files_instead_of_generated_locations_6003", "Specify the location where debugger should locate map files instead of generated locations."),
+        Specify_the_location_where_debugger_should_locate_TypeScript_files_instead_of_source_locations: diag(6004, DiagnosticCategory.Message, "Specify_the_location_where_debugger_should_locate_TypeScript_files_instead_of_source_locations_6004", "Specify the location where debugger should locate TypeScript files instead of source locations."),
+        Watch_input_files: diag(6005, DiagnosticCategory.Message, "Watch_input_files_6005", "Watch input files."),
+        Redirect_output_structure_to_the_directory: diag(6006, DiagnosticCategory.Message, "Redirect_output_structure_to_the_directory_6006", "Redirect output structure to the directory."),
+        Do_not_erase_const_enum_declarations_in_generated_code: diag(6007, DiagnosticCategory.Message, "Do_not_erase_const_enum_declarations_in_generated_code_6007", "Do not erase const enum declarations in generated code."),
+        Do_not_emit_outputs_if_any_errors_were_reported: diag(6008, DiagnosticCategory.Message, "Do_not_emit_outputs_if_any_errors_were_reported_6008", "Do not emit outputs if any errors were reported."),
+        Do_not_emit_comments_to_output: diag(6009, DiagnosticCategory.Message, "Do_not_emit_comments_to_output_6009", "Do not emit comments to output."),
+        Do_not_emit_outputs: diag(6010, DiagnosticCategory.Message, "Do_not_emit_outputs_6010", "Do not emit outputs."),
+        Allow_default_imports_from_modules_with_no_default_export_This_does_not_affect_code_emit_just_typechecking: diag(6011, DiagnosticCategory.Message, "Allow_default_imports_from_modules_with_no_default_export_This_does_not_affect_code_emit_just_typech_6011", "Allow default imports from modules with no default export. This does not affect code emit, just typechecking."),
+        Skip_type_checking_of_declaration_files: diag(6012, DiagnosticCategory.Message, "Skip_type_checking_of_declaration_files_6012", "Skip type checking of declaration files."),
+        Do_not_resolve_the_real_path_of_symlinks: diag(6013, DiagnosticCategory.Message, "Do_not_resolve_the_real_path_of_symlinks_6013", "Do not resolve the real path of symlinks."),
+        Only_emit_d_ts_declaration_files: diag(6014, DiagnosticCategory.Message, "Only_emit_d_ts_declaration_files_6014", "Only emit '.d.ts' declaration files."),
+        Specify_ECMAScript_target_version_Colon_ES3_default_ES5_ES2015_ES2016_ES2017_ES2018_or_ESNEXT: diag(6015, DiagnosticCategory.Message, "Specify_ECMAScript_target_version_Colon_ES3_default_ES5_ES2015_ES2016_ES2017_ES2018_or_ESNEXT_6015", "Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017','ES2018' or 'ESNEXT'."),
+        Specify_module_code_generation_Colon_none_commonjs_amd_system_umd_es2015_or_ESNext: diag(6016, DiagnosticCategory.Message, "Specify_module_code_generation_Colon_none_commonjs_amd_system_umd_es2015_or_ESNext_6016", "Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'."),
+        Print_this_message: diag(6017, DiagnosticCategory.Message, "Print_this_message_6017", "Print this message."),
+        Print_the_compiler_s_version: diag(6019, DiagnosticCategory.Message, "Print_the_compiler_s_version_6019", "Print the compiler's version."),
+        Compile_the_project_given_the_path_to_its_configuration_file_or_to_a_folder_with_a_tsconfig_json: diag(6020, DiagnosticCategory.Message, "Compile_the_project_given_the_path_to_its_configuration_file_or_to_a_folder_with_a_tsconfig_json_6020", "Compile the project given the path to its configuration file, or to a folder with a 'tsconfig.json'."),
+        Syntax_Colon_0: diag(6023, DiagnosticCategory.Message, "Syntax_Colon_0_6023", "Syntax: {0}"),
+        options: diag(6024, DiagnosticCategory.Message, "options_6024", "options"),
+        file: diag(6025, DiagnosticCategory.Message, "file_6025", "file"),
+        Examples_Colon_0: diag(6026, DiagnosticCategory.Message, "Examples_Colon_0_6026", "Examples: {0}"),
+        Options_Colon: diag(6027, DiagnosticCategory.Message, "Options_Colon_6027", "Options:"),
+        Version_0: diag(6029, DiagnosticCategory.Message, "Version_0_6029", "Version {0}"),
+        Insert_command_line_options_and_files_from_a_file: diag(6030, DiagnosticCategory.Message, "Insert_command_line_options_and_files_from_a_file_6030", "Insert command line options and files from a file."),
+        Starting_compilation_in_watch_mode: diag(6031, DiagnosticCategory.Message, "Starting_compilation_in_watch_mode_6031", "Starting compilation in watch mode..."),
+        File_change_detected_Starting_incremental_compilation: diag(6032, DiagnosticCategory.Message, "File_change_detected_Starting_incremental_compilation_6032", "File change detected. Starting incremental compilation..."),
+        KIND: diag(6034, DiagnosticCategory.Message, "KIND_6034", "KIND"),
+        FILE: diag(6035, DiagnosticCategory.Message, "FILE_6035", "FILE"),
+        VERSION: diag(6036, DiagnosticCategory.Message, "VERSION_6036", "VERSION"),
+        LOCATION: diag(6037, DiagnosticCategory.Message, "LOCATION_6037", "LOCATION"),
+        DIRECTORY: diag(6038, DiagnosticCategory.Message, "DIRECTORY_6038", "DIRECTORY"),
+        STRATEGY: diag(6039, DiagnosticCategory.Message, "STRATEGY_6039", "STRATEGY"),
+        FILE_OR_DIRECTORY: diag(6040, DiagnosticCategory.Message, "FILE_OR_DIRECTORY_6040", "FILE OR DIRECTORY"),
+        Generates_corresponding_map_file: diag(6043, DiagnosticCategory.Message, "Generates_corresponding_map_file_6043", "Generates corresponding '.map' file."),
+        Compiler_option_0_expects_an_argument: diag(6044, DiagnosticCategory.Error, "Compiler_option_0_expects_an_argument_6044", "Compiler option '{0}' expects an argument."),
+        Unterminated_quoted_string_in_response_file_0: diag(6045, DiagnosticCategory.Error, "Unterminated_quoted_string_in_response_file_0_6045", "Unterminated quoted string in response file '{0}'."),
+        Argument_for_0_option_must_be_Colon_1: diag(6046, DiagnosticCategory.Error, "Argument_for_0_option_must_be_Colon_1_6046", "Argument for '{0}' option must be: {1}."),
+        Locale_must_be_of_the_form_language_or_language_territory_For_example_0_or_1: diag(6048, DiagnosticCategory.Error, "Locale_must_be_of_the_form_language_or_language_territory_For_example_0_or_1_6048", "Locale must be of the form <language> or <language>-<territory>. For example '{0}' or '{1}'."),
+        Unsupported_locale_0: diag(6049, DiagnosticCategory.Error, "Unsupported_locale_0_6049", "Unsupported locale '{0}'."),
+        Unable_to_open_file_0: diag(6050, DiagnosticCategory.Error, "Unable_to_open_file_0_6050", "Unable to open file '{0}'."),
+        Corrupted_locale_file_0: diag(6051, DiagnosticCategory.Error, "Corrupted_locale_file_0_6051", "Corrupted locale file {0}."),
+        Raise_error_on_expressions_and_declarations_with_an_implied_any_type: diag(6052, DiagnosticCategory.Message, "Raise_error_on_expressions_and_declarations_with_an_implied_any_type_6052", "Raise error on expressions and declarations with an implied 'any' type."),
+        File_0_not_found: diag(6053, DiagnosticCategory.Error, "File_0_not_found_6053", "File '{0}' not found."),
+        File_0_has_unsupported_extension_The_only_supported_extensions_are_1: diag(6054, DiagnosticCategory.Error, "File_0_has_unsupported_extension_The_only_supported_extensions_are_1_6054", "File '{0}' has unsupported extension. The only supported extensions are {1}."),
+        Suppress_noImplicitAny_errors_for_indexing_objects_lacking_index_signatures: diag(6055, DiagnosticCategory.Message, "Suppress_noImplicitAny_errors_for_indexing_objects_lacking_index_signatures_6055", "Suppress noImplicitAny errors for indexing objects lacking index signatures."),
+        Do_not_emit_declarations_for_code_that_has_an_internal_annotation: diag(6056, DiagnosticCategory.Message, "Do_not_emit_declarations_for_code_that_has_an_internal_annotation_6056", "Do not emit declarations for code that has an '@internal' annotation."),
+        Specify_the_root_directory_of_input_files_Use_to_control_the_output_directory_structure_with_outDir: diag(6058, DiagnosticCategory.Message, "Specify_the_root_directory_of_input_files_Use_to_control_the_output_directory_structure_with_outDir_6058", "Specify the root directory of input files. Use to control the output directory structure with --outDir."),
+        File_0_is_not_under_rootDir_1_rootDir_is_expected_to_contain_all_source_files: diag(6059, DiagnosticCategory.Error, "File_0_is_not_under_rootDir_1_rootDir_is_expected_to_contain_all_source_files_6059", "File '{0}' is not under 'rootDir' '{1}'. 'rootDir' is expected to contain all source files."),
+        Specify_the_end_of_line_sequence_to_be_used_when_emitting_files_Colon_CRLF_dos_or_LF_unix: diag(6060, DiagnosticCategory.Message, "Specify_the_end_of_line_sequence_to_be_used_when_emitting_files_Colon_CRLF_dos_or_LF_unix_6060", "Specify the end of line sequence to be used when emitting files: 'CRLF' (dos) or 'LF' (unix)."),
+        NEWLINE: diag(6061, DiagnosticCategory.Message, "NEWLINE_6061", "NEWLINE"),
+        Option_0_can_only_be_specified_in_tsconfig_json_file: diag(6064, DiagnosticCategory.Error, "Option_0_can_only_be_specified_in_tsconfig_json_file_6064", "Option '{0}' can only be specified in 'tsconfig.json' file."),
+        Enables_experimental_support_for_ES7_decorators: diag(6065, DiagnosticCategory.Message, "Enables_experimental_support_for_ES7_decorators_6065", "Enables experimental support for ES7 decorators."),
+        Enables_experimental_support_for_emitting_type_metadata_for_decorators: diag(6066, DiagnosticCategory.Message, "Enables_experimental_support_for_emitting_type_metadata_for_decorators_6066", "Enables experimental support for emitting type metadata for decorators."),
+        Enables_experimental_support_for_ES7_async_functions: diag(6068, DiagnosticCategory.Message, "Enables_experimental_support_for_ES7_async_functions_6068", "Enables experimental support for ES7 async functions."),
+        Specify_module_resolution_strategy_Colon_node_Node_js_or_classic_TypeScript_pre_1_6: diag(6069, DiagnosticCategory.Message, "Specify_module_resolution_strategy_Colon_node_Node_js_or_classic_TypeScript_pre_1_6_6069", "Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6)."),
+        Initializes_a_TypeScript_project_and_creates_a_tsconfig_json_file: diag(6070, DiagnosticCategory.Message, "Initializes_a_TypeScript_project_and_creates_a_tsconfig_json_file_6070", "Initializes a TypeScript project and creates a tsconfig.json file."),
+        Successfully_created_a_tsconfig_json_file: diag(6071, DiagnosticCategory.Message, "Successfully_created_a_tsconfig_json_file_6071", "Successfully created a tsconfig.json file."),
+        Suppress_excess_property_checks_for_object_literals: diag(6072, DiagnosticCategory.Message, "Suppress_excess_property_checks_for_object_literals_6072", "Suppress excess property checks for object literals."),
+        Stylize_errors_and_messages_using_color_and_context_experimental: diag(6073, DiagnosticCategory.Message, "Stylize_errors_and_messages_using_color_and_context_experimental_6073", "Stylize errors and messages using color and context (experimental)."),
+        Do_not_report_errors_on_unused_labels: diag(6074, DiagnosticCategory.Message, "Do_not_report_errors_on_unused_labels_6074", "Do not report errors on unused labels."),
+        Report_error_when_not_all_code_paths_in_function_return_a_value: diag(6075, DiagnosticCategory.Message, "Report_error_when_not_all_code_paths_in_function_return_a_value_6075", "Report error when not all code paths in function return a value."),
+        Report_errors_for_fallthrough_cases_in_switch_statement: diag(6076, DiagnosticCategory.Message, "Report_errors_for_fallthrough_cases_in_switch_statement_6076", "Report errors for fallthrough cases in switch statement."),
+        Do_not_report_errors_on_unreachable_code: diag(6077, DiagnosticCategory.Message, "Do_not_report_errors_on_unreachable_code_6077", "Do not report errors on unreachable code."),
+        Disallow_inconsistently_cased_references_to_the_same_file: diag(6078, DiagnosticCategory.Message, "Disallow_inconsistently_cased_references_to_the_same_file_6078", "Disallow inconsistently-cased references to the same file."),
+        Specify_library_files_to_be_included_in_the_compilation: diag(6079, DiagnosticCategory.Message, "Specify_library_files_to_be_included_in_the_compilation_6079", "Specify library files to be included in the compilation."),
+        Specify_JSX_code_generation_Colon_preserve_react_native_or_react: diag(6080, DiagnosticCategory.Message, "Specify_JSX_code_generation_Colon_preserve_react_native_or_react_6080", "Specify JSX code generation: 'preserve', 'react-native', or 'react'."),
+        File_0_has_an_unsupported_extension_so_skipping_it: diag(6081, DiagnosticCategory.Message, "File_0_has_an_unsupported_extension_so_skipping_it_6081", "File '{0}' has an unsupported extension, so skipping it."),
+        Only_amd_and_system_modules_are_supported_alongside_0: diag(6082, DiagnosticCategory.Error, "Only_amd_and_system_modules_are_supported_alongside_0_6082", "Only 'amd' and 'system' modules are supported alongside --{0}."),
+        Base_directory_to_resolve_non_absolute_module_names: diag(6083, DiagnosticCategory.Message, "Base_directory_to_resolve_non_absolute_module_names_6083", "Base directory to resolve non-absolute module names."),
+        Deprecated_Use_jsxFactory_instead_Specify_the_object_invoked_for_createElement_when_targeting_react_JSX_emit: diag(6084, DiagnosticCategory.Message, "Deprecated_Use_jsxFactory_instead_Specify_the_object_invoked_for_createElement_when_targeting_react__6084", "[Deprecated] Use '--jsxFactory' instead. Specify the object invoked for createElement when targeting 'react' JSX emit"),
+        Enable_tracing_of_the_name_resolution_process: diag(6085, DiagnosticCategory.Message, "Enable_tracing_of_the_name_resolution_process_6085", "Enable tracing of the name resolution process."),
+        Resolving_module_0_from_1: diag(6086, DiagnosticCategory.Message, "Resolving_module_0_from_1_6086", "======== Resolving module '{0}' from '{1}'. ========"),
+        Explicitly_specified_module_resolution_kind_Colon_0: diag(6087, DiagnosticCategory.Message, "Explicitly_specified_module_resolution_kind_Colon_0_6087", "Explicitly specified module resolution kind: '{0}'."),
+        Module_resolution_kind_is_not_specified_using_0: diag(6088, DiagnosticCategory.Message, "Module_resolution_kind_is_not_specified_using_0_6088", "Module resolution kind is not specified, using '{0}'."),
+        Module_name_0_was_successfully_resolved_to_1: diag(6089, DiagnosticCategory.Message, "Module_name_0_was_successfully_resolved_to_1_6089", "======== Module name '{0}' was successfully resolved to '{1}'. ========"),
+        Module_name_0_was_not_resolved: diag(6090, DiagnosticCategory.Message, "Module_name_0_was_not_resolved_6090", "======== Module name '{0}' was not resolved. ========"),
+        paths_option_is_specified_looking_for_a_pattern_to_match_module_name_0: diag(6091, DiagnosticCategory.Message, "paths_option_is_specified_looking_for_a_pattern_to_match_module_name_0_6091", "'paths' option is specified, looking for a pattern to match module name '{0}'."),
+        Module_name_0_matched_pattern_1: diag(6092, DiagnosticCategory.Message, "Module_name_0_matched_pattern_1_6092", "Module name '{0}', matched pattern '{1}'."),
+        Trying_substitution_0_candidate_module_location_Colon_1: diag(6093, DiagnosticCategory.Message, "Trying_substitution_0_candidate_module_location_Colon_1_6093", "Trying substitution '{0}', candidate module location: '{1}'."),
+        Resolving_module_name_0_relative_to_base_url_1_2: diag(6094, DiagnosticCategory.Message, "Resolving_module_name_0_relative_to_base_url_1_2_6094", "Resolving module name '{0}' relative to base url '{1}' - '{2}'."),
+        Loading_module_as_file_Slash_folder_candidate_module_location_0_target_file_type_1: diag(6095, DiagnosticCategory.Message, "Loading_module_as_file_Slash_folder_candidate_module_location_0_target_file_type_1_6095", "Loading module as file / folder, candidate module location '{0}', target file type '{1}'."),
+        File_0_does_not_exist: diag(6096, DiagnosticCategory.Message, "File_0_does_not_exist_6096", "File '{0}' does not exist."),
+        File_0_exist_use_it_as_a_name_resolution_result: diag(6097, DiagnosticCategory.Message, "File_0_exist_use_it_as_a_name_resolution_result_6097", "File '{0}' exist - use it as a name resolution result."),
+        Loading_module_0_from_node_modules_folder_target_file_type_1: diag(6098, DiagnosticCategory.Message, "Loading_module_0_from_node_modules_folder_target_file_type_1_6098", "Loading module '{0}' from 'node_modules' folder, target file type '{1}'."),
+        Found_package_json_at_0: diag(6099, DiagnosticCategory.Message, "Found_package_json_at_0_6099", "Found 'package.json' at '{0}'."),
+        package_json_does_not_have_a_0_field: diag(6100, DiagnosticCategory.Message, "package_json_does_not_have_a_0_field_6100", "'package.json' does not have a '{0}' field."),
+        package_json_has_0_field_1_that_references_2: diag(6101, DiagnosticCategory.Message, "package_json_has_0_field_1_that_references_2_6101", "'package.json' has '{0}' field '{1}' that references '{2}'."),
+        Allow_javascript_files_to_be_compiled: diag(6102, DiagnosticCategory.Message, "Allow_javascript_files_to_be_compiled_6102", "Allow javascript files to be compiled."),
+        Option_0_should_have_array_of_strings_as_a_value: diag(6103, DiagnosticCategory.Error, "Option_0_should_have_array_of_strings_as_a_value_6103", "Option '{0}' should have array of strings as a value."),
+        Checking_if_0_is_the_longest_matching_prefix_for_1_2: diag(6104, DiagnosticCategory.Message, "Checking_if_0_is_the_longest_matching_prefix_for_1_2_6104", "Checking if '{0}' is the longest matching prefix for '{1}' - '{2}'."),
+        Expected_type_of_0_field_in_package_json_to_be_string_got_1: diag(6105, DiagnosticCategory.Message, "Expected_type_of_0_field_in_package_json_to_be_string_got_1_6105", "Expected type of '{0}' field in 'package.json' to be 'string', got '{1}'."),
+        baseUrl_option_is_set_to_0_using_this_value_to_resolve_non_relative_module_name_1: diag(6106, DiagnosticCategory.Message, "baseUrl_option_is_set_to_0_using_this_value_to_resolve_non_relative_module_name_1_6106", "'baseUrl' option is set to '{0}', using this value to resolve non-relative module name '{1}'."),
+        rootDirs_option_is_set_using_it_to_resolve_relative_module_name_0: diag(6107, DiagnosticCategory.Message, "rootDirs_option_is_set_using_it_to_resolve_relative_module_name_0_6107", "'rootDirs' option is set, using it to resolve relative module name '{0}'."),
+        Longest_matching_prefix_for_0_is_1: diag(6108, DiagnosticCategory.Message, "Longest_matching_prefix_for_0_is_1_6108", "Longest matching prefix for '{0}' is '{1}'."),
+        Loading_0_from_the_root_dir_1_candidate_location_2: diag(6109, DiagnosticCategory.Message, "Loading_0_from_the_root_dir_1_candidate_location_2_6109", "Loading '{0}' from the root dir '{1}', candidate location '{2}'."),
+        Trying_other_entries_in_rootDirs: diag(6110, DiagnosticCategory.Message, "Trying_other_entries_in_rootDirs_6110", "Trying other entries in 'rootDirs'."),
+        Module_resolution_using_rootDirs_has_failed: diag(6111, DiagnosticCategory.Message, "Module_resolution_using_rootDirs_has_failed_6111", "Module resolution using 'rootDirs' has failed."),
+        Do_not_emit_use_strict_directives_in_module_output: diag(6112, DiagnosticCategory.Message, "Do_not_emit_use_strict_directives_in_module_output_6112", "Do not emit 'use strict' directives in module output."),
+        Enable_strict_null_checks: diag(6113, DiagnosticCategory.Message, "Enable_strict_null_checks_6113", "Enable strict null checks."),
+        Unknown_option_excludes_Did_you_mean_exclude: diag(6114, DiagnosticCategory.Error, "Unknown_option_excludes_Did_you_mean_exclude_6114", "Unknown option 'excludes'. Did you mean 'exclude'?"),
+        Raise_error_on_this_expressions_with_an_implied_any_type: diag(6115, DiagnosticCategory.Message, "Raise_error_on_this_expressions_with_an_implied_any_type_6115", "Raise error on 'this' expressions with an implied 'any' type."),
+        Resolving_type_reference_directive_0_containing_file_1_root_directory_2: diag(6116, DiagnosticCategory.Message, "Resolving_type_reference_directive_0_containing_file_1_root_directory_2_6116", "======== Resolving type reference directive '{0}', containing file '{1}', root directory '{2}'. ========"),
+        Resolving_using_primary_search_paths: diag(6117, DiagnosticCategory.Message, "Resolving_using_primary_search_paths_6117", "Resolving using primary search paths..."),
+        Resolving_from_node_modules_folder: diag(6118, DiagnosticCategory.Message, "Resolving_from_node_modules_folder_6118", "Resolving from node_modules folder..."),
+        Type_reference_directive_0_was_successfully_resolved_to_1_primary_Colon_2: diag(6119, DiagnosticCategory.Message, "Type_reference_directive_0_was_successfully_resolved_to_1_primary_Colon_2_6119", "======== Type reference directive '{0}' was successfully resolved to '{1}', primary: {2}. ========"),
+        Type_reference_directive_0_was_not_resolved: diag(6120, DiagnosticCategory.Message, "Type_reference_directive_0_was_not_resolved_6120", "======== Type reference directive '{0}' was not resolved. ========"),
+        Resolving_with_primary_search_path_0: diag(6121, DiagnosticCategory.Message, "Resolving_with_primary_search_path_0_6121", "Resolving with primary search path '{0}'."),
+        Root_directory_cannot_be_determined_skipping_primary_search_paths: diag(6122, DiagnosticCategory.Message, "Root_directory_cannot_be_determined_skipping_primary_search_paths_6122", "Root directory cannot be determined, skipping primary search paths."),
+        Resolving_type_reference_directive_0_containing_file_1_root_directory_not_set: diag(6123, DiagnosticCategory.Message, "Resolving_type_reference_directive_0_containing_file_1_root_directory_not_set_6123", "======== Resolving type reference directive '{0}', containing file '{1}', root directory not set. ========"),
+        Type_declaration_files_to_be_included_in_compilation: diag(6124, DiagnosticCategory.Message, "Type_declaration_files_to_be_included_in_compilation_6124", "Type declaration files to be included in compilation."),
+        Looking_up_in_node_modules_folder_initial_location_0: diag(6125, DiagnosticCategory.Message, "Looking_up_in_node_modules_folder_initial_location_0_6125", "Looking up in 'node_modules' folder, initial location '{0}'."),
+        Containing_file_is_not_specified_and_root_directory_cannot_be_determined_skipping_lookup_in_node_modules_folder: diag(6126, DiagnosticCategory.Message, "Containing_file_is_not_specified_and_root_directory_cannot_be_determined_skipping_lookup_in_node_mod_6126", "Containing file is not specified and root directory cannot be determined, skipping lookup in 'node_modules' folder."),
+        Resolving_type_reference_directive_0_containing_file_not_set_root_directory_1: diag(6127, DiagnosticCategory.Message, "Resolving_type_reference_directive_0_containing_file_not_set_root_directory_1_6127", "======== Resolving type reference directive '{0}', containing file not set, root directory '{1}'. ========"),
+        Resolving_type_reference_directive_0_containing_file_not_set_root_directory_not_set: diag(6128, DiagnosticCategory.Message, "Resolving_type_reference_directive_0_containing_file_not_set_root_directory_not_set_6128", "======== Resolving type reference directive '{0}', containing file not set, root directory not set. ========"),
+        Resolving_real_path_for_0_result_1: diag(6130, DiagnosticCategory.Message, "Resolving_real_path_for_0_result_1_6130", "Resolving real path for '{0}', result '{1}'."),
+        Cannot_compile_modules_using_option_0_unless_the_module_flag_is_amd_or_system: diag(6131, DiagnosticCategory.Error, "Cannot_compile_modules_using_option_0_unless_the_module_flag_is_amd_or_system_6131", "Cannot compile modules using option '{0}' unless the '--module' flag is 'amd' or 'system'."),
+        File_name_0_has_a_1_extension_stripping_it: diag(6132, DiagnosticCategory.Message, "File_name_0_has_a_1_extension_stripping_it_6132", "File name '{0}' has a '{1}' extension - stripping it."),
+        _0_is_declared_but_its_value_is_never_read: diag(6133, DiagnosticCategory.Error, "_0_is_declared_but_its_value_is_never_read_6133", "'{0}' is declared but its value is never read.", /*reportsUnnecessary*/ true),
+        Report_errors_on_unused_locals: diag(6134, DiagnosticCategory.Message, "Report_errors_on_unused_locals_6134", "Report errors on unused locals."),
+        Report_errors_on_unused_parameters: diag(6135, DiagnosticCategory.Message, "Report_errors_on_unused_parameters_6135", "Report errors on unused parameters."),
+        The_maximum_dependency_depth_to_search_under_node_modules_and_load_JavaScript_files: diag(6136, DiagnosticCategory.Message, "The_maximum_dependency_depth_to_search_under_node_modules_and_load_JavaScript_files_6136", "The maximum dependency depth to search under node_modules and load JavaScript files."),
+        Cannot_import_type_declaration_files_Consider_importing_0_instead_of_1: diag(6137, DiagnosticCategory.Error, "Cannot_import_type_declaration_files_Consider_importing_0_instead_of_1_6137", "Cannot import type declaration files. Consider importing '{0}' instead of '{1}'."),
+        Property_0_is_declared_but_its_value_is_never_read: diag(6138, DiagnosticCategory.Error, "Property_0_is_declared_but_its_value_is_never_read_6138", "Property '{0}' is declared but its value is never read.", /*reportsUnnecessary*/ true),
+        Import_emit_helpers_from_tslib: diag(6139, DiagnosticCategory.Message, "Import_emit_helpers_from_tslib_6139", "Import emit helpers from 'tslib'."),
+        Auto_discovery_for_typings_is_enabled_in_project_0_Running_extra_resolution_pass_for_module_1_using_cache_location_2: diag(6140, DiagnosticCategory.Error, "Auto_discovery_for_typings_is_enabled_in_project_0_Running_extra_resolution_pass_for_module_1_using__6140", "Auto discovery for typings is enabled in project '{0}'. Running extra resolution pass for module '{1}' using cache location '{2}'."),
+        Parse_in_strict_mode_and_emit_use_strict_for_each_source_file: diag(6141, DiagnosticCategory.Message, "Parse_in_strict_mode_and_emit_use_strict_for_each_source_file_6141", "Parse in strict mode and emit \"use strict\" for each source file."),
+        Module_0_was_resolved_to_1_but_jsx_is_not_set: diag(6142, DiagnosticCategory.Error, "Module_0_was_resolved_to_1_but_jsx_is_not_set_6142", "Module '{0}' was resolved to '{1}', but '--jsx' is not set."),
+        Module_0_was_resolved_as_locally_declared_ambient_module_in_file_1: diag(6144, DiagnosticCategory.Message, "Module_0_was_resolved_as_locally_declared_ambient_module_in_file_1_6144", "Module '{0}' was resolved as locally declared ambient module in file '{1}'."),
+        Module_0_was_resolved_as_ambient_module_declared_in_1_since_this_file_was_not_modified: diag(6145, DiagnosticCategory.Message, "Module_0_was_resolved_as_ambient_module_declared_in_1_since_this_file_was_not_modified_6145", "Module '{0}' was resolved as ambient module declared in '{1}' since this file was not modified."),
+        Specify_the_JSX_factory_function_to_use_when_targeting_react_JSX_emit_e_g_React_createElement_or_h: diag(6146, DiagnosticCategory.Message, "Specify_the_JSX_factory_function_to_use_when_targeting_react_JSX_emit_e_g_React_createElement_or_h_6146", "Specify the JSX factory function to use when targeting 'react' JSX emit, e.g. 'React.createElement' or 'h'."),
+        Resolution_for_module_0_was_found_in_cache_from_location_1: diag(6147, DiagnosticCategory.Message, "Resolution_for_module_0_was_found_in_cache_from_location_1_6147", "Resolution for module '{0}' was found in cache from location '{1}'."),
+        Directory_0_does_not_exist_skipping_all_lookups_in_it: diag(6148, DiagnosticCategory.Message, "Directory_0_does_not_exist_skipping_all_lookups_in_it_6148", "Directory '{0}' does not exist, skipping all lookups in it."),
+        Show_diagnostic_information: diag(6149, DiagnosticCategory.Message, "Show_diagnostic_information_6149", "Show diagnostic information."),
+        Show_verbose_diagnostic_information: diag(6150, DiagnosticCategory.Message, "Show_verbose_diagnostic_information_6150", "Show verbose diagnostic information."),
+        Emit_a_single_file_with_source_maps_instead_of_having_a_separate_file: diag(6151, DiagnosticCategory.Message, "Emit_a_single_file_with_source_maps_instead_of_having_a_separate_file_6151", "Emit a single file with source maps instead of having a separate file."),
+        Emit_the_source_alongside_the_sourcemaps_within_a_single_file_requires_inlineSourceMap_or_sourceMap_to_be_set: diag(6152, DiagnosticCategory.Message, "Emit_the_source_alongside_the_sourcemaps_within_a_single_file_requires_inlineSourceMap_or_sourceMap__6152", "Emit the source alongside the sourcemaps within a single file; requires '--inlineSourceMap' or '--sourceMap' to be set."),
+        Transpile_each_file_as_a_separate_module_similar_to_ts_transpileModule: diag(6153, DiagnosticCategory.Message, "Transpile_each_file_as_a_separate_module_similar_to_ts_transpileModule_6153", "Transpile each file as a separate module (similar to 'ts.transpileModule')."),
+        Print_names_of_generated_files_part_of_the_compilation: diag(6154, DiagnosticCategory.Message, "Print_names_of_generated_files_part_of_the_compilation_6154", "Print names of generated files part of the compilation."),
+        Print_names_of_files_part_of_the_compilation: diag(6155, DiagnosticCategory.Message, "Print_names_of_files_part_of_the_compilation_6155", "Print names of files part of the compilation."),
+        The_locale_used_when_displaying_messages_to_the_user_e_g_en_us: diag(6156, DiagnosticCategory.Message, "The_locale_used_when_displaying_messages_to_the_user_e_g_en_us_6156", "The locale used when displaying messages to the user (e.g. 'en-us')"),
+        Do_not_generate_custom_helper_functions_like_extends_in_compiled_output: diag(6157, DiagnosticCategory.Message, "Do_not_generate_custom_helper_functions_like_extends_in_compiled_output_6157", "Do not generate custom helper functions like '__extends' in compiled output."),
+        Do_not_include_the_default_library_file_lib_d_ts: diag(6158, DiagnosticCategory.Message, "Do_not_include_the_default_library_file_lib_d_ts_6158", "Do not include the default library file (lib.d.ts)."),
+        Do_not_add_triple_slash_references_or_imported_modules_to_the_list_of_compiled_files: diag(6159, DiagnosticCategory.Message, "Do_not_add_triple_slash_references_or_imported_modules_to_the_list_of_compiled_files_6159", "Do not add triple-slash references or imported modules to the list of compiled files."),
+        Deprecated_Use_skipLibCheck_instead_Skip_type_checking_of_default_library_declaration_files: diag(6160, DiagnosticCategory.Message, "Deprecated_Use_skipLibCheck_instead_Skip_type_checking_of_default_library_declaration_files_6160", "[Deprecated] Use '--skipLibCheck' instead. Skip type checking of default library declaration files."),
+        List_of_folders_to_include_type_definitions_from: diag(6161, DiagnosticCategory.Message, "List_of_folders_to_include_type_definitions_from_6161", "List of folders to include type definitions from."),
+        Disable_size_limitations_on_JavaScript_projects: diag(6162, DiagnosticCategory.Message, "Disable_size_limitations_on_JavaScript_projects_6162", "Disable size limitations on JavaScript projects."),
+        The_character_set_of_the_input_files: diag(6163, DiagnosticCategory.Message, "The_character_set_of_the_input_files_6163", "The character set of the input files."),
+        Emit_a_UTF_8_Byte_Order_Mark_BOM_in_the_beginning_of_output_files: diag(6164, DiagnosticCategory.Message, "Emit_a_UTF_8_Byte_Order_Mark_BOM_in_the_beginning_of_output_files_6164", "Emit a UTF-8 Byte Order Mark (BOM) in the beginning of output files."),
+        Do_not_truncate_error_messages: diag(6165, DiagnosticCategory.Message, "Do_not_truncate_error_messages_6165", "Do not truncate error messages."),
+        Output_directory_for_generated_declaration_files: diag(6166, DiagnosticCategory.Message, "Output_directory_for_generated_declaration_files_6166", "Output directory for generated declaration files."),
+        A_series_of_entries_which_re_map_imports_to_lookup_locations_relative_to_the_baseUrl: diag(6167, DiagnosticCategory.Message, "A_series_of_entries_which_re_map_imports_to_lookup_locations_relative_to_the_baseUrl_6167", "A series of entries which re-map imports to lookup locations relative to the 'baseUrl'."),
+        List_of_root_folders_whose_combined_content_represents_the_structure_of_the_project_at_runtime: diag(6168, DiagnosticCategory.Message, "List_of_root_folders_whose_combined_content_represents_the_structure_of_the_project_at_runtime_6168", "List of root folders whose combined content represents the structure of the project at runtime."),
+        Show_all_compiler_options: diag(6169, DiagnosticCategory.Message, "Show_all_compiler_options_6169", "Show all compiler options."),
+        Deprecated_Use_outFile_instead_Concatenate_and_emit_output_to_single_file: diag(6170, DiagnosticCategory.Message, "Deprecated_Use_outFile_instead_Concatenate_and_emit_output_to_single_file_6170", "[Deprecated] Use '--outFile' instead. Concatenate and emit output to single file"),
+        Command_line_Options: diag(6171, DiagnosticCategory.Message, "Command_line_Options_6171", "Command-line Options"),
+        Basic_Options: diag(6172, DiagnosticCategory.Message, "Basic_Options_6172", "Basic Options"),
+        Strict_Type_Checking_Options: diag(6173, DiagnosticCategory.Message, "Strict_Type_Checking_Options_6173", "Strict Type-Checking Options"),
+        Module_Resolution_Options: diag(6174, DiagnosticCategory.Message, "Module_Resolution_Options_6174", "Module Resolution Options"),
+        Source_Map_Options: diag(6175, DiagnosticCategory.Message, "Source_Map_Options_6175", "Source Map Options"),
+        Additional_Checks: diag(6176, DiagnosticCategory.Message, "Additional_Checks_6176", "Additional Checks"),
+        Experimental_Options: diag(6177, DiagnosticCategory.Message, "Experimental_Options_6177", "Experimental Options"),
+        Advanced_Options: diag(6178, DiagnosticCategory.Message, "Advanced_Options_6178", "Advanced Options"),
+        Provide_full_support_for_iterables_in_for_of_spread_and_destructuring_when_targeting_ES5_or_ES3: diag(6179, DiagnosticCategory.Message, "Provide_full_support_for_iterables_in_for_of_spread_and_destructuring_when_targeting_ES5_or_ES3_6179", "Provide full support for iterables in 'for-of', spread, and destructuring when targeting 'ES5' or 'ES3'."),
+        Enable_all_strict_type_checking_options: diag(6180, DiagnosticCategory.Message, "Enable_all_strict_type_checking_options_6180", "Enable all strict type-checking options."),
+        List_of_language_service_plugins: diag(6181, DiagnosticCategory.Message, "List_of_language_service_plugins_6181", "List of language service plugins."),
+        Scoped_package_detected_looking_in_0: diag(6182, DiagnosticCategory.Message, "Scoped_package_detected_looking_in_0_6182", "Scoped package detected, looking in '{0}'"),
+        Reusing_resolution_of_module_0_to_file_1_from_old_program: diag(6183, DiagnosticCategory.Message, "Reusing_resolution_of_module_0_to_file_1_from_old_program_6183", "Reusing resolution of module '{0}' to file '{1}' from old program."),
+        Reusing_module_resolutions_originating_in_0_since_resolutions_are_unchanged_from_old_program: diag(6184, DiagnosticCategory.Message, "Reusing_module_resolutions_originating_in_0_since_resolutions_are_unchanged_from_old_program_6184", "Reusing module resolutions originating in '{0}' since resolutions are unchanged from old program."),
+        Disable_strict_checking_of_generic_signatures_in_function_types: diag(6185, DiagnosticCategory.Message, "Disable_strict_checking_of_generic_signatures_in_function_types_6185", "Disable strict checking of generic signatures in function types."),
+        Enable_strict_checking_of_function_types: diag(6186, DiagnosticCategory.Message, "Enable_strict_checking_of_function_types_6186", "Enable strict checking of function types."),
+        Enable_strict_checking_of_property_initialization_in_classes: diag(6187, DiagnosticCategory.Message, "Enable_strict_checking_of_property_initialization_in_classes_6187", "Enable strict checking of property initialization in classes."),
+        Numeric_separators_are_not_allowed_here: diag(6188, DiagnosticCategory.Error, "Numeric_separators_are_not_allowed_here_6188", "Numeric separators are not allowed here."),
+        Multiple_consecutive_numeric_separators_are_not_permitted: diag(6189, DiagnosticCategory.Error, "Multiple_consecutive_numeric_separators_are_not_permitted_6189", "Multiple consecutive numeric separators are not permitted."),
+        Found_package_json_at_0_Package_ID_is_1: diag(6190, DiagnosticCategory.Message, "Found_package_json_at_0_Package_ID_is_1_6190", "Found 'package.json' at '{0}'. Package ID is '{1}'."),
+        Whether_to_keep_outdated_console_output_in_watch_mode_instead_of_clearing_the_screen: diag(6191, DiagnosticCategory.Message, "Whether_to_keep_outdated_console_output_in_watch_mode_instead_of_clearing_the_screen_6191", "Whether to keep outdated console output in watch mode instead of clearing the screen."),
+        All_imports_in_import_declaration_are_unused: diag(6192, DiagnosticCategory.Error, "All_imports_in_import_declaration_are_unused_6192", "All imports in import declaration are unused.", /*reportsUnnecessary*/ true),
+        Found_1_error_Watching_for_file_changes: diag(6193, DiagnosticCategory.Message, "Found_1_error_Watching_for_file_changes_6193", "Found 1 error. Watching for file changes."),
+        Found_0_errors_Watching_for_file_changes: diag(6194, DiagnosticCategory.Message, "Found_0_errors_Watching_for_file_changes_6194", "Found {0} errors. Watching for file changes."),
+        Resolve_keyof_to_string_valued_property_names_only_no_numbers_or_symbols: diag(6195, DiagnosticCategory.Message, "Resolve_keyof_to_string_valued_property_names_only_no_numbers_or_symbols_6195", "Resolve 'keyof' to string valued property names only (no numbers or symbols)."),
+        _0_is_declared_but_never_used: diag(6196, DiagnosticCategory.Error, "_0_is_declared_but_never_used_6196", "'{0}' is declared but never used.", /*reportsUnnecessary*/ true),
+        Include_modules_imported_with_json_extension: diag(6197, DiagnosticCategory.Message, "Include_modules_imported_with_json_extension_6197", "Include modules imported with '.json' extension"),
+        All_destructured_elements_are_unused: diag(6198, DiagnosticCategory.Error, "All_destructured_elements_are_unused_6198", "All destructured elements are unused.", /*reportsUnnecessary*/ true),
+        All_variables_are_unused: diag(6199, DiagnosticCategory.Error, "All_variables_are_unused_6199", "All variables are unused.", /*reportsUnnecessary*/ true),
+        Projects_to_reference: diag(6300, DiagnosticCategory.Message, "Projects_to_reference_6300", "Projects to reference"),
+        Enable_project_compilation: diag(6302, DiagnosticCategory.Message, "Enable_project_compilation_6302", "Enable project compilation"),
+        Project_references_may_not_form_a_circular_graph_Cycle_detected_Colon_0: diag(6202, DiagnosticCategory.Error, "Project_references_may_not_form_a_circular_graph_Cycle_detected_Colon_0_6202", "Project references may not form a circular graph. Cycle detected: {0}"),
+        Composite_projects_may_not_disable_declaration_emit: diag(6304, DiagnosticCategory.Error, "Composite_projects_may_not_disable_declaration_emit_6304", "Composite projects may not disable declaration emit."),
+        Output_file_0_has_not_been_built_from_source_file_1: diag(6305, DiagnosticCategory.Error, "Output_file_0_has_not_been_built_from_source_file_1_6305", "Output file '{0}' has not been built from source file '{1}'."),
+        Referenced_project_0_must_have_setting_composite_Colon_true: diag(6306, DiagnosticCategory.Error, "Referenced_project_0_must_have_setting_composite_Colon_true_6306", "Referenced project '{0}' must have setting \"composite\": true."),
+        File_0_is_not_in_project_file_list_Projects_must_list_all_files_or_use_an_include_pattern: diag(6307, DiagnosticCategory.Error, "File_0_is_not_in_project_file_list_Projects_must_list_all_files_or_use_an_include_pattern_6307", "File '{0}' is not in project file list. Projects must list all files or use an 'include' pattern."),
+        Cannot_prepend_project_0_because_it_does_not_have_outFile_set: diag(6308, DiagnosticCategory.Error, "Cannot_prepend_project_0_because_it_does_not_have_outFile_set_6308", "Cannot prepend project '{0}' because it does not have 'outFile' set"),
+        Output_file_0_from_project_1_does_not_exist: diag(6309, DiagnosticCategory.Error, "Output_file_0_from_project_1_does_not_exist_6309", "Output file '{0}' from project '{1}' does not exist"),
+        Project_0_is_out_of_date_because_oldest_output_1_is_older_than_newest_input_2: diag(6350, DiagnosticCategory.Message, "Project_0_is_out_of_date_because_oldest_output_1_is_older_than_newest_input_2_6350", "Project '{0}' is out of date because oldest output '{1}' is older than newest input '{2}'"),
+        Project_0_is_up_to_date_because_newest_input_1_is_older_than_oldest_output_2: diag(6351, DiagnosticCategory.Message, "Project_0_is_up_to_date_because_newest_input_1_is_older_than_oldest_output_2_6351", "Project '{0}' is up to date because newest input '{1}' is older than oldest output '{2}'"),
+        Project_0_is_out_of_date_because_output_file_1_does_not_exist: diag(6352, DiagnosticCategory.Message, "Project_0_is_out_of_date_because_output_file_1_does_not_exist_6352", "Project '{0}' is out of date because output file '{1}' does not exist"),
+        Project_0_is_out_of_date_because_its_dependency_1_is_out_of_date: diag(6353, DiagnosticCategory.Message, "Project_0_is_out_of_date_because_its_dependency_1_is_out_of_date_6353", "Project '{0}' is out of date because its dependency '{1}' is out of date"),
+        Project_0_is_up_to_date_with_d_ts_files_from_its_dependencies: diag(6354, DiagnosticCategory.Message, "Project_0_is_up_to_date_with_d_ts_files_from_its_dependencies_6354", "Project '{0}' is up to date with .d.ts files from its dependencies"),
+        Projects_in_this_build_Colon_0: diag(6355, DiagnosticCategory.Message, "Projects_in_this_build_Colon_0_6355", "Projects in this build: {0}"),
+        A_non_dry_build_would_delete_the_following_files_Colon_0: diag(6356, DiagnosticCategory.Message, "A_non_dry_build_would_delete_the_following_files_Colon_0_6356", "A non-dry build would delete the following files: {0}"),
+        A_non_dry_build_would_build_project_0: diag(6357, DiagnosticCategory.Message, "A_non_dry_build_would_build_project_0_6357", "A non-dry build would build project '{0}'"),
+        Building_project_0: diag(6358, DiagnosticCategory.Message, "Building_project_0_6358", "Building project '{0}'..."),
+        Updating_output_timestamps_of_project_0: diag(6359, DiagnosticCategory.Message, "Updating_output_timestamps_of_project_0_6359", "Updating output timestamps of project '{0}'..."),
+        delete_this_Project_0_is_up_to_date_because_it_was_previously_built: diag(6360, DiagnosticCategory.Message, "delete_this_Project_0_is_up_to_date_because_it_was_previously_built_6360", "delete this - Project '{0}' is up to date because it was previously built"),
+        Project_0_is_up_to_date: diag(6361, DiagnosticCategory.Message, "Project_0_is_up_to_date_6361", "Project '{0}' is up to date"),
+        Skipping_build_of_project_0_because_its_dependency_1_has_errors: diag(6362, DiagnosticCategory.Message, "Skipping_build_of_project_0_because_its_dependency_1_has_errors_6362", "Skipping build of project '{0}' because its dependency '{1}' has errors"),
+        Project_0_can_t_be_built_because_its_dependency_1_has_errors: diag(6363, DiagnosticCategory.Message, "Project_0_can_t_be_built_because_its_dependency_1_has_errors_6363", "Project '{0}' can't be built because its dependency '{1}' has errors"),
+        Build_one_or_more_projects_and_their_dependencies_if_out_of_date: diag(6364, DiagnosticCategory.Message, "Build_one_or_more_projects_and_their_dependencies_if_out_of_date_6364", "Build one or more projects and their dependencies, if out of date"),
+        Delete_the_outputs_of_all_projects: diag(6365, DiagnosticCategory.Message, "Delete_the_outputs_of_all_projects_6365", "Delete the outputs of all projects"),
+        Enable_verbose_logging: diag(6366, DiagnosticCategory.Message, "Enable_verbose_logging_6366", "Enable verbose logging"),
+        Show_what_would_be_built_or_deleted_if_specified_with_clean: diag(6367, DiagnosticCategory.Message, "Show_what_would_be_built_or_deleted_if_specified_with_clean_6367", "Show what would be built (or deleted, if specified with '--clean')"),
+        Build_all_projects_including_those_that_appear_to_be_up_to_date: diag(6368, DiagnosticCategory.Message, "Build_all_projects_including_those_that_appear_to_be_up_to_date_6368", "Build all projects, including those that appear to be up to date"),
+        Option_build_must_be_the_first_command_line_argument: diag(6369, DiagnosticCategory.Error, "Option_build_must_be_the_first_command_line_argument_6369", "Option '--build' must be the first command line argument."),
+        Options_0_and_1_cannot_be_combined: diag(6370, DiagnosticCategory.Error, "Options_0_and_1_cannot_be_combined_6370", "Options '{0}' and '{1}' cannot be combined."),
+        Skipping_clean_because_not_all_projects_could_be_located: diag(6371, DiagnosticCategory.Error, "Skipping_clean_because_not_all_projects_could_be_located_6371", "Skipping clean because not all projects could be located"),
+        Variable_0_implicitly_has_an_1_type: diag(7005, DiagnosticCategory.Error, "Variable_0_implicitly_has_an_1_type_7005", "Variable '{0}' implicitly has an '{1}' type."),
+        Parameter_0_implicitly_has_an_1_type: diag(7006, DiagnosticCategory.Error, "Parameter_0_implicitly_has_an_1_type_7006", "Parameter '{0}' implicitly has an '{1}' type."),
+        Member_0_implicitly_has_an_1_type: diag(7008, DiagnosticCategory.Error, "Member_0_implicitly_has_an_1_type_7008", "Member '{0}' implicitly has an '{1}' type."),
+        new_expression_whose_target_lacks_a_construct_signature_implicitly_has_an_any_type: diag(7009, DiagnosticCategory.Error, "new_expression_whose_target_lacks_a_construct_signature_implicitly_has_an_any_type_7009", "'new' expression, whose target lacks a construct signature, implicitly has an 'any' type."),
+        _0_which_lacks_return_type_annotation_implicitly_has_an_1_return_type: diag(7010, DiagnosticCategory.Error, "_0_which_lacks_return_type_annotation_implicitly_has_an_1_return_type_7010", "'{0}', which lacks return-type annotation, implicitly has an '{1}' return type."),
+        Function_expression_which_lacks_return_type_annotation_implicitly_has_an_0_return_type: diag(7011, DiagnosticCategory.Error, "Function_expression_which_lacks_return_type_annotation_implicitly_has_an_0_return_type_7011", "Function expression, which lacks return-type annotation, implicitly has an '{0}' return type."),
+        Construct_signature_which_lacks_return_type_annotation_implicitly_has_an_any_return_type: diag(7013, DiagnosticCategory.Error, "Construct_signature_which_lacks_return_type_annotation_implicitly_has_an_any_return_type_7013", "Construct signature, which lacks return-type annotation, implicitly has an 'any' return type."),
+        Element_implicitly_has_an_any_type_because_index_expression_is_not_of_type_number: diag(7015, DiagnosticCategory.Error, "Element_implicitly_has_an_any_type_because_index_expression_is_not_of_type_number_7015", "Element implicitly has an 'any' type because index expression is not of type 'number'."),
+        Could_not_find_a_declaration_file_for_module_0_1_implicitly_has_an_any_type: diag(7016, DiagnosticCategory.Error, "Could_not_find_a_declaration_file_for_module_0_1_implicitly_has_an_any_type_7016", "Could not find a declaration file for module '{0}'. '{1}' implicitly has an 'any' type."),
+        Element_implicitly_has_an_any_type_because_type_0_has_no_index_signature: diag(7017, DiagnosticCategory.Error, "Element_implicitly_has_an_any_type_because_type_0_has_no_index_signature_7017", "Element implicitly has an 'any' type because type '{0}' has no index signature."),
+        Object_literal_s_property_0_implicitly_has_an_1_type: diag(7018, DiagnosticCategory.Error, "Object_literal_s_property_0_implicitly_has_an_1_type_7018", "Object literal's property '{0}' implicitly has an '{1}' type."),
+        Rest_parameter_0_implicitly_has_an_any_type: diag(7019, DiagnosticCategory.Error, "Rest_parameter_0_implicitly_has_an_any_type_7019", "Rest parameter '{0}' implicitly has an 'any[]' type."),
+        Call_signature_which_lacks_return_type_annotation_implicitly_has_an_any_return_type: diag(7020, DiagnosticCategory.Error, "Call_signature_which_lacks_return_type_annotation_implicitly_has_an_any_return_type_7020", "Call signature, which lacks return-type annotation, implicitly has an 'any' return type."),
+        _0_implicitly_has_type_any_because_it_does_not_have_a_type_annotation_and_is_referenced_directly_or_indirectly_in_its_own_initializer: diag(7022, DiagnosticCategory.Error, "_0_implicitly_has_type_any_because_it_does_not_have_a_type_annotation_and_is_referenced_directly_or__7022", "'{0}' implicitly has type 'any' because it does not have a type annotation and is referenced directly or indirectly in its own initializer."),
+        _0_implicitly_has_return_type_any_because_it_does_not_have_a_return_type_annotation_and_is_referenced_directly_or_indirectly_in_one_of_its_return_expressions: diag(7023, DiagnosticCategory.Error, "_0_implicitly_has_return_type_any_because_it_does_not_have_a_return_type_annotation_and_is_reference_7023", "'{0}' implicitly has return type 'any' because it does not have a return type annotation and is referenced directly or indirectly in one of its return expressions."),
+        Function_implicitly_has_return_type_any_because_it_does_not_have_a_return_type_annotation_and_is_referenced_directly_or_indirectly_in_one_of_its_return_expressions: diag(7024, DiagnosticCategory.Error, "Function_implicitly_has_return_type_any_because_it_does_not_have_a_return_type_annotation_and_is_ref_7024", "Function implicitly has return type 'any' because it does not have a return type annotation and is referenced directly or indirectly in one of its return expressions."),
+        Generator_implicitly_has_type_0_because_it_does_not_yield_any_values_Consider_supplying_a_return_type: diag(7025, DiagnosticCategory.Error, "Generator_implicitly_has_type_0_because_it_does_not_yield_any_values_Consider_supplying_a_return_typ_7025", "Generator implicitly has type '{0}' because it does not yield any values. Consider supplying a return type."),
+        JSX_element_implicitly_has_type_any_because_no_interface_JSX_0_exists: diag(7026, DiagnosticCategory.Error, "JSX_element_implicitly_has_type_any_because_no_interface_JSX_0_exists_7026", "JSX element implicitly has type 'any' because no interface 'JSX.{0}' exists."),
+        Unreachable_code_detected: diag(7027, DiagnosticCategory.Error, "Unreachable_code_detected_7027", "Unreachable code detected.", /*reportsUnnecessary*/ true),
+        Unused_label: diag(7028, DiagnosticCategory.Error, "Unused_label_7028", "Unused label.", /*reportsUnnecessary*/ true),
+        Fallthrough_case_in_switch: diag(7029, DiagnosticCategory.Error, "Fallthrough_case_in_switch_7029", "Fallthrough case in switch."),
+        Not_all_code_paths_return_a_value: diag(7030, DiagnosticCategory.Error, "Not_all_code_paths_return_a_value_7030", "Not all code paths return a value."),
+        Binding_element_0_implicitly_has_an_1_type: diag(7031, DiagnosticCategory.Error, "Binding_element_0_implicitly_has_an_1_type_7031", "Binding element '{0}' implicitly has an '{1}' type."),
+        Property_0_implicitly_has_type_any_because_its_set_accessor_lacks_a_parameter_type_annotation: diag(7032, DiagnosticCategory.Error, "Property_0_implicitly_has_type_any_because_its_set_accessor_lacks_a_parameter_type_annotation_7032", "Property '{0}' implicitly has type 'any', because its set accessor lacks a parameter type annotation."),
+        Property_0_implicitly_has_type_any_because_its_get_accessor_lacks_a_return_type_annotation: diag(7033, DiagnosticCategory.Error, "Property_0_implicitly_has_type_any_because_its_get_accessor_lacks_a_return_type_annotation_7033", "Property '{0}' implicitly has type 'any', because its get accessor lacks a return type annotation."),
+        Variable_0_implicitly_has_type_1_in_some_locations_where_its_type_cannot_be_determined: diag(7034, DiagnosticCategory.Error, "Variable_0_implicitly_has_type_1_in_some_locations_where_its_type_cannot_be_determined_7034", "Variable '{0}' implicitly has type '{1}' in some locations where its type cannot be determined."),
+        Try_npm_install_types_Slash_0_if_it_exists_or_add_a_new_declaration_d_ts_file_containing_declare_module_0: diag(7035, DiagnosticCategory.Error, "Try_npm_install_types_Slash_0_if_it_exists_or_add_a_new_declaration_d_ts_file_containing_declare_mod_7035", "Try `npm install @types/{0}` if it exists or add a new declaration (.d.ts) file containing `declare module '{0}';`"),
+        Dynamic_import_s_specifier_must_be_of_type_string_but_here_has_type_0: diag(7036, DiagnosticCategory.Error, "Dynamic_import_s_specifier_must_be_of_type_string_but_here_has_type_0_7036", "Dynamic import's specifier must be of type 'string', but here has type '{0}'."),
+        Enables_emit_interoperability_between_CommonJS_and_ES_Modules_via_creation_of_namespace_objects_for_all_imports_Implies_allowSyntheticDefaultImports: diag(7037, DiagnosticCategory.Message, "Enables_emit_interoperability_between_CommonJS_and_ES_Modules_via_creation_of_namespace_objects_for__7037", "Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'."),
+        A_namespace_style_import_cannot_be_called_or_constructed_and_will_cause_a_failure_at_runtime: diag(7038, DiagnosticCategory.Error, "A_namespace_style_import_cannot_be_called_or_constructed_and_will_cause_a_failure_at_runtime_7038", "A namespace-style import cannot be called or constructed, and will cause a failure at runtime."),
+        Mapped_object_type_implicitly_has_an_any_template_type: diag(7039, DiagnosticCategory.Error, "Mapped_object_type_implicitly_has_an_any_template_type_7039", "Mapped object type implicitly has an 'any' template type."),
+        You_cannot_rename_this_element: diag(8000, DiagnosticCategory.Error, "You_cannot_rename_this_element_8000", "You cannot rename this element."),
+        You_cannot_rename_elements_that_are_defined_in_the_standard_TypeScript_library: diag(8001, DiagnosticCategory.Error, "You_cannot_rename_elements_that_are_defined_in_the_standard_TypeScript_library_8001", "You cannot rename elements that are defined in the standard TypeScript library."),
+        import_can_only_be_used_in_a_ts_file: diag(8002, DiagnosticCategory.Error, "import_can_only_be_used_in_a_ts_file_8002", "'import ... =' can only be used in a .ts file."),
+        export_can_only_be_used_in_a_ts_file: diag(8003, DiagnosticCategory.Error, "export_can_only_be_used_in_a_ts_file_8003", "'export=' can only be used in a .ts file."),
+        type_parameter_declarations_can_only_be_used_in_a_ts_file: diag(8004, DiagnosticCategory.Error, "type_parameter_declarations_can_only_be_used_in_a_ts_file_8004", "'type parameter declarations' can only be used in a .ts file."),
+        implements_clauses_can_only_be_used_in_a_ts_file: diag(8005, DiagnosticCategory.Error, "implements_clauses_can_only_be_used_in_a_ts_file_8005", "'implements clauses' can only be used in a .ts file."),
+        interface_declarations_can_only_be_used_in_a_ts_file: diag(8006, DiagnosticCategory.Error, "interface_declarations_can_only_be_used_in_a_ts_file_8006", "'interface declarations' can only be used in a .ts file."),
+        module_declarations_can_only_be_used_in_a_ts_file: diag(8007, DiagnosticCategory.Error, "module_declarations_can_only_be_used_in_a_ts_file_8007", "'module declarations' can only be used in a .ts file."),
+        type_aliases_can_only_be_used_in_a_ts_file: diag(8008, DiagnosticCategory.Error, "type_aliases_can_only_be_used_in_a_ts_file_8008", "'type aliases' can only be used in a .ts file."),
+        _0_can_only_be_used_in_a_ts_file: diag(8009, DiagnosticCategory.Error, "_0_can_only_be_used_in_a_ts_file_8009", "'{0}' can only be used in a .ts file."),
+        types_can_only_be_used_in_a_ts_file: diag(8010, DiagnosticCategory.Error, "types_can_only_be_used_in_a_ts_file_8010", "'types' can only be used in a .ts file."),
+        type_arguments_can_only_be_used_in_a_ts_file: diag(8011, DiagnosticCategory.Error, "type_arguments_can_only_be_used_in_a_ts_file_8011", "'type arguments' can only be used in a .ts file."),
+        parameter_modifiers_can_only_be_used_in_a_ts_file: diag(8012, DiagnosticCategory.Error, "parameter_modifiers_can_only_be_used_in_a_ts_file_8012", "'parameter modifiers' can only be used in a .ts file."),
+        non_null_assertions_can_only_be_used_in_a_ts_file: diag(8013, DiagnosticCategory.Error, "non_null_assertions_can_only_be_used_in_a_ts_file_8013", "'non-null assertions' can only be used in a .ts file."),
+        enum_declarations_can_only_be_used_in_a_ts_file: diag(8015, DiagnosticCategory.Error, "enum_declarations_can_only_be_used_in_a_ts_file_8015", "'enum declarations' can only be used in a .ts file."),
+        type_assertion_expressions_can_only_be_used_in_a_ts_file: diag(8016, DiagnosticCategory.Error, "type_assertion_expressions_can_only_be_used_in_a_ts_file_8016", "'type assertion expressions' can only be used in a .ts file."),
+        Octal_literal_types_must_use_ES2015_syntax_Use_the_syntax_0: diag(8017, DiagnosticCategory.Error, "Octal_literal_types_must_use_ES2015_syntax_Use_the_syntax_0_8017", "Octal literal types must use ES2015 syntax. Use the syntax '{0}'."),
+        Octal_literals_are_not_allowed_in_enums_members_initializer_Use_the_syntax_0: diag(8018, DiagnosticCategory.Error, "Octal_literals_are_not_allowed_in_enums_members_initializer_Use_the_syntax_0_8018", "Octal literals are not allowed in enums members initializer. Use the syntax '{0}'."),
+        Report_errors_in_js_files: diag(8019, DiagnosticCategory.Message, "Report_errors_in_js_files_8019", "Report errors in .js files."),
+        JSDoc_types_can_only_be_used_inside_documentation_comments: diag(8020, DiagnosticCategory.Error, "JSDoc_types_can_only_be_used_inside_documentation_comments_8020", "JSDoc types can only be used inside documentation comments."),
+        JSDoc_typedef_tag_should_either_have_a_type_annotation_or_be_followed_by_property_or_member_tags: diag(8021, DiagnosticCategory.Error, "JSDoc_typedef_tag_should_either_have_a_type_annotation_or_be_followed_by_property_or_member_tags_8021", "JSDoc '@typedef' tag should either have a type annotation or be followed by '@property' or '@member' tags."),
+        JSDoc_0_is_not_attached_to_a_class: diag(8022, DiagnosticCategory.Error, "JSDoc_0_is_not_attached_to_a_class_8022", "JSDoc '@{0}' is not attached to a class."),
+        JSDoc_0_1_does_not_match_the_extends_2_clause: diag(8023, DiagnosticCategory.Error, "JSDoc_0_1_does_not_match_the_extends_2_clause_8023", "JSDoc '@{0} {1}' does not match the 'extends {2}' clause."),
+        JSDoc_param_tag_has_name_0_but_there_is_no_parameter_with_that_name: diag(8024, DiagnosticCategory.Error, "JSDoc_param_tag_has_name_0_but_there_is_no_parameter_with_that_name_8024", "JSDoc '@param' tag has name '{0}', but there is no parameter with that name."),
+        Class_declarations_cannot_have_more_than_one_augments_or_extends_tag: diag(8025, DiagnosticCategory.Error, "Class_declarations_cannot_have_more_than_one_augments_or_extends_tag_8025", "Class declarations cannot have more than one `@augments` or `@extends` tag."),
+        Expected_0_type_arguments_provide_these_with_an_extends_tag: diag(8026, DiagnosticCategory.Error, "Expected_0_type_arguments_provide_these_with_an_extends_tag_8026", "Expected {0} type arguments; provide these with an '@extends' tag."),
+        Expected_0_1_type_arguments_provide_these_with_an_extends_tag: diag(8027, DiagnosticCategory.Error, "Expected_0_1_type_arguments_provide_these_with_an_extends_tag_8027", "Expected {0}-{1} type arguments; provide these with an '@extends' tag."),
+        JSDoc_may_only_appear_in_the_last_parameter_of_a_signature: diag(8028, DiagnosticCategory.Error, "JSDoc_may_only_appear_in_the_last_parameter_of_a_signature_8028", "JSDoc '...' may only appear in the last parameter of a signature."),
+        JSDoc_param_tag_has_name_0_but_there_is_no_parameter_with_that_name_It_would_match_arguments_if_it_had_an_array_type: diag(8029, DiagnosticCategory.Error, "JSDoc_param_tag_has_name_0_but_there_is_no_parameter_with_that_name_It_would_match_arguments_if_it_h_8029", "JSDoc '@param' tag has name '{0}', but there is no parameter with that name. It would match 'arguments' if it had an array type."),
+        Only_identifiers_Slashqualified_names_with_optional_type_arguments_are_currently_supported_in_a_class_extends_clause: diag(9002, DiagnosticCategory.Error, "Only_identifiers_Slashqualified_names_with_optional_type_arguments_are_currently_supported_in_a_clas_9002", "Only identifiers/qualified-names with optional type arguments are currently supported in a class 'extends' clause."),
+        class_expressions_are_not_currently_supported: diag(9003, DiagnosticCategory.Error, "class_expressions_are_not_currently_supported_9003", "'class' expressions are not currently supported."),
+        Language_service_is_disabled: diag(9004, DiagnosticCategory.Error, "Language_service_is_disabled_9004", "Language service is disabled."),
+        JSX_attributes_must_only_be_assigned_a_non_empty_expression: diag(17000, DiagnosticCategory.Error, "JSX_attributes_must_only_be_assigned_a_non_empty_expression_17000", "JSX attributes must only be assigned a non-empty 'expression'."),
+        JSX_elements_cannot_have_multiple_attributes_with_the_same_name: diag(17001, DiagnosticCategory.Error, "JSX_elements_cannot_have_multiple_attributes_with_the_same_name_17001", "JSX elements cannot have multiple attributes with the same name."),
+        Expected_corresponding_JSX_closing_tag_for_0: diag(17002, DiagnosticCategory.Error, "Expected_corresponding_JSX_closing_tag_for_0_17002", "Expected corresponding JSX closing tag for '{0}'."),
+        JSX_attribute_expected: diag(17003, DiagnosticCategory.Error, "JSX_attribute_expected_17003", "JSX attribute expected."),
+        Cannot_use_JSX_unless_the_jsx_flag_is_provided: diag(17004, DiagnosticCategory.Error, "Cannot_use_JSX_unless_the_jsx_flag_is_provided_17004", "Cannot use JSX unless the '--jsx' flag is provided."),
+        A_constructor_cannot_contain_a_super_call_when_its_class_extends_null: diag(17005, DiagnosticCategory.Error, "A_constructor_cannot_contain_a_super_call_when_its_class_extends_null_17005", "A constructor cannot contain a 'super' call when its class extends 'null'."),
+        An_unary_expression_with_the_0_operator_is_not_allowed_in_the_left_hand_side_of_an_exponentiation_expression_Consider_enclosing_the_expression_in_parentheses: diag(17006, DiagnosticCategory.Error, "An_unary_expression_with_the_0_operator_is_not_allowed_in_the_left_hand_side_of_an_exponentiation_ex_17006", "An unary expression with the '{0}' operator is not allowed in the left-hand side of an exponentiation expression. Consider enclosing the expression in parentheses."),
+        A_type_assertion_expression_is_not_allowed_in_the_left_hand_side_of_an_exponentiation_expression_Consider_enclosing_the_expression_in_parentheses: diag(17007, DiagnosticCategory.Error, "A_type_assertion_expression_is_not_allowed_in_the_left_hand_side_of_an_exponentiation_expression_Con_17007", "A type assertion expression is not allowed in the left-hand side of an exponentiation expression. Consider enclosing the expression in parentheses."),
+        JSX_element_0_has_no_corresponding_closing_tag: diag(17008, DiagnosticCategory.Error, "JSX_element_0_has_no_corresponding_closing_tag_17008", "JSX element '{0}' has no corresponding closing tag."),
+        super_must_be_called_before_accessing_this_in_the_constructor_of_a_derived_class: diag(17009, DiagnosticCategory.Error, "super_must_be_called_before_accessing_this_in_the_constructor_of_a_derived_class_17009", "'super' must be called before accessing 'this' in the constructor of a derived class."),
+        Unknown_type_acquisition_option_0: diag(17010, DiagnosticCategory.Error, "Unknown_type_acquisition_option_0_17010", "Unknown type acquisition option '{0}'."),
+        super_must_be_called_before_accessing_a_property_of_super_in_the_constructor_of_a_derived_class: diag(17011, DiagnosticCategory.Error, "super_must_be_called_before_accessing_a_property_of_super_in_the_constructor_of_a_derived_class_17011", "'super' must be called before accessing a property of 'super' in the constructor of a derived class."),
+        _0_is_not_a_valid_meta_property_for_keyword_1_Did_you_mean_2: diag(17012, DiagnosticCategory.Error, "_0_is_not_a_valid_meta_property_for_keyword_1_Did_you_mean_2_17012", "'{0}' is not a valid meta-property for keyword '{1}'. Did you mean '{2}'?"),
+        Meta_property_0_is_only_allowed_in_the_body_of_a_function_declaration_function_expression_or_constructor: diag(17013, DiagnosticCategory.Error, "Meta_property_0_is_only_allowed_in_the_body_of_a_function_declaration_function_expression_or_constru_17013", "Meta-property '{0}' is only allowed in the body of a function declaration, function expression, or constructor."),
+        JSX_fragment_has_no_corresponding_closing_tag: diag(17014, DiagnosticCategory.Error, "JSX_fragment_has_no_corresponding_closing_tag_17014", "JSX fragment has no corresponding closing tag."),
+        Expected_corresponding_closing_tag_for_JSX_fragment: diag(17015, DiagnosticCategory.Error, "Expected_corresponding_closing_tag_for_JSX_fragment_17015", "Expected corresponding closing tag for JSX fragment."),
+        JSX_fragment_is_not_supported_when_using_jsxFactory: diag(17016, DiagnosticCategory.Error, "JSX_fragment_is_not_supported_when_using_jsxFactory_17016", "JSX fragment is not supported when using --jsxFactory"),
+        JSX_fragment_is_not_supported_when_using_an_inline_JSX_factory_pragma: diag(17017, DiagnosticCategory.Error, "JSX_fragment_is_not_supported_when_using_an_inline_JSX_factory_pragma_17017", "JSX fragment is not supported when using an inline JSX factory pragma"),
+        Circularity_detected_while_resolving_configuration_Colon_0: diag(18000, DiagnosticCategory.Error, "Circularity_detected_while_resolving_configuration_Colon_0_18000", "Circularity detected while resolving configuration: {0}"),
+        A_path_in_an_extends_option_must_be_relative_or_rooted_but_0_is_not: diag(18001, DiagnosticCategory.Error, "A_path_in_an_extends_option_must_be_relative_or_rooted_but_0_is_not_18001", "A path in an 'extends' option must be relative or rooted, but '{0}' is not."),
+        The_files_list_in_config_file_0_is_empty: diag(18002, DiagnosticCategory.Error, "The_files_list_in_config_file_0_is_empty_18002", "The 'files' list in config file '{0}' is empty."),
+        No_inputs_were_found_in_config_file_0_Specified_include_paths_were_1_and_exclude_paths_were_2: diag(18003, DiagnosticCategory.Error, "No_inputs_were_found_in_config_file_0_Specified_include_paths_were_1_and_exclude_paths_were_2_18003", "No inputs were found in config file '{0}'. Specified 'include' paths were '{1}' and 'exclude' paths were '{2}'."),
+        File_is_a_CommonJS_module_it_may_be_converted_to_an_ES6_module: diag(80001, DiagnosticCategory.Suggestion, "File_is_a_CommonJS_module_it_may_be_converted_to_an_ES6_module_80001", "File is a CommonJS module; it may be converted to an ES6 module."),
+        This_constructor_function_may_be_converted_to_a_class_declaration: diag(80002, DiagnosticCategory.Suggestion, "This_constructor_function_may_be_converted_to_a_class_declaration_80002", "This constructor function may be converted to a class declaration."),
+        Import_may_be_converted_to_a_default_import: diag(80003, DiagnosticCategory.Suggestion, "Import_may_be_converted_to_a_default_import_80003", "Import may be converted to a default import."),
+        JSDoc_types_may_be_moved_to_TypeScript_types: diag(80004, DiagnosticCategory.Suggestion, "JSDoc_types_may_be_moved_to_TypeScript_types_80004", "JSDoc types may be moved to TypeScript types."),
+        require_call_may_be_converted_to_an_import: diag(80005, DiagnosticCategory.Suggestion, "require_call_may_be_converted_to_an_import_80005", "'require' call may be converted to an import."),
+        Add_missing_super_call: diag(90001, DiagnosticCategory.Message, "Add_missing_super_call_90001", "Add missing 'super()' call"),
+        Make_super_call_the_first_statement_in_the_constructor: diag(90002, DiagnosticCategory.Message, "Make_super_call_the_first_statement_in_the_constructor_90002", "Make 'super()' call the first statement in the constructor"),
+        Change_extends_to_implements: diag(90003, DiagnosticCategory.Message, "Change_extends_to_implements_90003", "Change 'extends' to 'implements'"),
+        Remove_declaration_for_Colon_0: diag(90004, DiagnosticCategory.Message, "Remove_declaration_for_Colon_0_90004", "Remove declaration for: '{0}'"),
+        Remove_import_from_0: diag(90005, DiagnosticCategory.Message, "Remove_import_from_0_90005", "Remove import from '{0}'"),
+        Implement_interface_0: diag(90006, DiagnosticCategory.Message, "Implement_interface_0_90006", "Implement interface '{0}'"),
+        Implement_inherited_abstract_class: diag(90007, DiagnosticCategory.Message, "Implement_inherited_abstract_class_90007", "Implement inherited abstract class"),
+        Add_0_to_unresolved_variable: diag(90008, DiagnosticCategory.Message, "Add_0_to_unresolved_variable_90008", "Add '{0}.' to unresolved variable"),
+        Remove_destructuring: diag(90009, DiagnosticCategory.Message, "Remove_destructuring_90009", "Remove destructuring"),
+        Remove_variable_statement: diag(90010, DiagnosticCategory.Message, "Remove_variable_statement_90010", "Remove variable statement"),
+        Import_0_from_module_1: diag(90013, DiagnosticCategory.Message, "Import_0_from_module_1_90013", "Import '{0}' from module \"{1}\""),
+        Change_0_to_1: diag(90014, DiagnosticCategory.Message, "Change_0_to_1_90014", "Change '{0}' to '{1}'"),
+        Add_0_to_existing_import_declaration_from_1: diag(90015, DiagnosticCategory.Message, "Add_0_to_existing_import_declaration_from_1_90015", "Add '{0}' to existing import declaration from \"{1}\""),
+        Declare_property_0: diag(90016, DiagnosticCategory.Message, "Declare_property_0_90016", "Declare property '{0}'"),
+        Add_index_signature_for_property_0: diag(90017, DiagnosticCategory.Message, "Add_index_signature_for_property_0_90017", "Add index signature for property '{0}'"),
+        Disable_checking_for_this_file: diag(90018, DiagnosticCategory.Message, "Disable_checking_for_this_file_90018", "Disable checking for this file"),
+        Ignore_this_error_message: diag(90019, DiagnosticCategory.Message, "Ignore_this_error_message_90019", "Ignore this error message"),
+        Initialize_property_0_in_the_constructor: diag(90020, DiagnosticCategory.Message, "Initialize_property_0_in_the_constructor_90020", "Initialize property '{0}' in the constructor"),
+        Initialize_static_property_0: diag(90021, DiagnosticCategory.Message, "Initialize_static_property_0_90021", "Initialize static property '{0}'"),
+        Change_spelling_to_0: diag(90022, DiagnosticCategory.Message, "Change_spelling_to_0_90022", "Change spelling to '{0}'"),
+        Declare_method_0: diag(90023, DiagnosticCategory.Message, "Declare_method_0_90023", "Declare method '{0}'"),
+        Declare_static_method_0: diag(90024, DiagnosticCategory.Message, "Declare_static_method_0_90024", "Declare static method '{0}'"),
+        Prefix_0_with_an_underscore: diag(90025, DiagnosticCategory.Message, "Prefix_0_with_an_underscore_90025", "Prefix '{0}' with an underscore"),
+        Rewrite_as_the_indexed_access_type_0: diag(90026, DiagnosticCategory.Message, "Rewrite_as_the_indexed_access_type_0_90026", "Rewrite as the indexed access type '{0}'"),
+        Declare_static_property_0: diag(90027, DiagnosticCategory.Message, "Declare_static_property_0_90027", "Declare static property '{0}'"),
+        Call_decorator_expression: diag(90028, DiagnosticCategory.Message, "Call_decorator_expression_90028", "Call decorator expression"),
+        Add_async_modifier_to_containing_function: diag(90029, DiagnosticCategory.Message, "Add_async_modifier_to_containing_function_90029", "Add async modifier to containing function"),
+        Convert_function_to_an_ES2015_class: diag(95001, DiagnosticCategory.Message, "Convert_function_to_an_ES2015_class_95001", "Convert function to an ES2015 class"),
+        Convert_function_0_to_class: diag(95002, DiagnosticCategory.Message, "Convert_function_0_to_class_95002", "Convert function '{0}' to class"),
+        Extract_to_0_in_1: diag(95004, DiagnosticCategory.Message, "Extract_to_0_in_1_95004", "Extract to {0} in {1}"),
+        Extract_function: diag(95005, DiagnosticCategory.Message, "Extract_function_95005", "Extract function"),
+        Extract_constant: diag(95006, DiagnosticCategory.Message, "Extract_constant_95006", "Extract constant"),
+        Extract_to_0_in_enclosing_scope: diag(95007, DiagnosticCategory.Message, "Extract_to_0_in_enclosing_scope_95007", "Extract to {0} in enclosing scope"),
+        Extract_to_0_in_1_scope: diag(95008, DiagnosticCategory.Message, "Extract_to_0_in_1_scope_95008", "Extract to {0} in {1} scope"),
+        Annotate_with_type_from_JSDoc: diag(95009, DiagnosticCategory.Message, "Annotate_with_type_from_JSDoc_95009", "Annotate with type from JSDoc"),
+        Annotate_with_types_from_JSDoc: diag(95010, DiagnosticCategory.Message, "Annotate_with_types_from_JSDoc_95010", "Annotate with types from JSDoc"),
+        Infer_type_of_0_from_usage: diag(95011, DiagnosticCategory.Message, "Infer_type_of_0_from_usage_95011", "Infer type of '{0}' from usage"),
+        Infer_parameter_types_from_usage: diag(95012, DiagnosticCategory.Message, "Infer_parameter_types_from_usage_95012", "Infer parameter types from usage"),
+        Convert_to_default_import: diag(95013, DiagnosticCategory.Message, "Convert_to_default_import_95013", "Convert to default import"),
+        Install_0: diag(95014, DiagnosticCategory.Message, "Install_0_95014", "Install '{0}'"),
+        Replace_import_with_0: diag(95015, DiagnosticCategory.Message, "Replace_import_with_0_95015", "Replace import with '{0}'."),
+        Use_synthetic_default_member: diag(95016, DiagnosticCategory.Message, "Use_synthetic_default_member_95016", "Use synthetic 'default' member."),
+        Convert_to_ES6_module: diag(95017, DiagnosticCategory.Message, "Convert_to_ES6_module_95017", "Convert to ES6 module"),
+        Add_undefined_type_to_property_0: diag(95018, DiagnosticCategory.Message, "Add_undefined_type_to_property_0_95018", "Add 'undefined' type to property '{0}'"),
+        Add_initializer_to_property_0: diag(95019, DiagnosticCategory.Message, "Add_initializer_to_property_0_95019", "Add initializer to property '{0}'"),
+        Add_definite_assignment_assertion_to_property_0: diag(95020, DiagnosticCategory.Message, "Add_definite_assignment_assertion_to_property_0_95020", "Add definite assignment assertion to property '{0}'"),
+        Add_all_missing_members: diag(95022, DiagnosticCategory.Message, "Add_all_missing_members_95022", "Add all missing members"),
+        Infer_all_types_from_usage: diag(95023, DiagnosticCategory.Message, "Infer_all_types_from_usage_95023", "Infer all types from usage"),
+        Delete_all_unused_declarations: diag(95024, DiagnosticCategory.Message, "Delete_all_unused_declarations_95024", "Delete all unused declarations"),
+        Prefix_all_unused_declarations_with_where_possible: diag(95025, DiagnosticCategory.Message, "Prefix_all_unused_declarations_with_where_possible_95025", "Prefix all unused declarations with '_' where possible"),
+        Fix_all_detected_spelling_errors: diag(95026, DiagnosticCategory.Message, "Fix_all_detected_spelling_errors_95026", "Fix all detected spelling errors"),
+        Add_initializers_to_all_uninitialized_properties: diag(95027, DiagnosticCategory.Message, "Add_initializers_to_all_uninitialized_properties_95027", "Add initializers to all uninitialized properties"),
+        Add_definite_assignment_assertions_to_all_uninitialized_properties: diag(95028, DiagnosticCategory.Message, "Add_definite_assignment_assertions_to_all_uninitialized_properties_95028", "Add definite assignment assertions to all uninitialized properties"),
+        Add_undefined_type_to_all_uninitialized_properties: diag(95029, DiagnosticCategory.Message, "Add_undefined_type_to_all_uninitialized_properties_95029", "Add undefined type to all uninitialized properties"),
+        Change_all_jsdoc_style_types_to_TypeScript: diag(95030, DiagnosticCategory.Message, "Change_all_jsdoc_style_types_to_TypeScript_95030", "Change all jsdoc-style types to TypeScript"),
+        Change_all_jsdoc_style_types_to_TypeScript_and_add_undefined_to_nullable_types: diag(95031, DiagnosticCategory.Message, "Change_all_jsdoc_style_types_to_TypeScript_and_add_undefined_to_nullable_types_95031", "Change all jsdoc-style types to TypeScript (and add '| undefined' to nullable types)"),
+        Implement_all_unimplemented_interfaces: diag(95032, DiagnosticCategory.Message, "Implement_all_unimplemented_interfaces_95032", "Implement all unimplemented interfaces"),
+        Install_all_missing_types_packages: diag(95033, DiagnosticCategory.Message, "Install_all_missing_types_packages_95033", "Install all missing types packages"),
+        Rewrite_all_as_indexed_access_types: diag(95034, DiagnosticCategory.Message, "Rewrite_all_as_indexed_access_types_95034", "Rewrite all as indexed access types"),
+        Convert_all_to_default_imports: diag(95035, DiagnosticCategory.Message, "Convert_all_to_default_imports_95035", "Convert all to default imports"),
+        Make_all_super_calls_the_first_statement_in_their_constructor: diag(95036, DiagnosticCategory.Message, "Make_all_super_calls_the_first_statement_in_their_constructor_95036", "Make all 'super()' calls the first statement in their constructor"),
+        Add_qualifier_to_all_unresolved_variables_matching_a_member_name: diag(95037, DiagnosticCategory.Message, "Add_qualifier_to_all_unresolved_variables_matching_a_member_name_95037", "Add qualifier to all unresolved variables matching a member name"),
+        Change_all_extended_interfaces_to_implements: diag(95038, DiagnosticCategory.Message, "Change_all_extended_interfaces_to_implements_95038", "Change all extended interfaces to 'implements'"),
+        Add_all_missing_super_calls: diag(95039, DiagnosticCategory.Message, "Add_all_missing_super_calls_95039", "Add all missing super calls"),
+        Implement_all_inherited_abstract_classes: diag(95040, DiagnosticCategory.Message, "Implement_all_inherited_abstract_classes_95040", "Implement all inherited abstract classes"),
+        Add_all_missing_async_modifiers: diag(95041, DiagnosticCategory.Message, "Add_all_missing_async_modifiers_95041", "Add all missing 'async' modifiers"),
+        Add_ts_ignore_to_all_error_messages: diag(95042, DiagnosticCategory.Message, "Add_ts_ignore_to_all_error_messages_95042", "Add '@ts-ignore' to all error messages"),
+        Annotate_everything_with_types_from_JSDoc: diag(95043, DiagnosticCategory.Message, "Annotate_everything_with_types_from_JSDoc_95043", "Annotate everything with types from JSDoc"),
+        Add_to_all_uncalled_decorators: diag(95044, DiagnosticCategory.Message, "Add_to_all_uncalled_decorators_95044", "Add '()' to all uncalled decorators"),
+        Convert_all_constructor_functions_to_classes: diag(95045, DiagnosticCategory.Message, "Convert_all_constructor_functions_to_classes_95045", "Convert all constructor functions to classes"),
+        Generate_get_and_set_accessors: diag(95046, DiagnosticCategory.Message, "Generate_get_and_set_accessors_95046", "Generate 'get' and 'set' accessors"),
+        Convert_require_to_import: diag(95047, DiagnosticCategory.Message, "Convert_require_to_import_95047", "Convert 'require' to 'import'"),
+        Convert_all_require_to_import: diag(95048, DiagnosticCategory.Message, "Convert_all_require_to_import_95048", "Convert all 'require' to 'import'"),
+        Move_to_a_new_file: diag(95049, DiagnosticCategory.Message, "Move_to_a_new_file_95049", "Move to a new file"),
+        Remove_unreachable_code: diag(95050, DiagnosticCategory.Message, "Remove_unreachable_code_95050", "Remove unreachable code"),
+        Remove_all_unreachable_code: diag(95051, DiagnosticCategory.Message, "Remove_all_unreachable_code_95051", "Remove all unreachable code"),
+        Add_missing_typeof: diag(95052, DiagnosticCategory.Message, "Add_missing_typeof_95052", "Add missing 'typeof'"),
+        Remove_unused_label: diag(95053, DiagnosticCategory.Message, "Remove_unused_label_95053", "Remove unused label"),
+        Remove_all_unused_labels: diag(95054, DiagnosticCategory.Message, "Remove_all_unused_labels_95054", "Remove all unused labels"),
+        Convert_0_to_mapped_object_type: diag(95055, DiagnosticCategory.Message, "Convert_0_to_mapped_object_type_95055", "Convert '{0}' to mapped object type"),
+        Convert_namespace_import_to_named_imports: diag(95056, DiagnosticCategory.Message, "Convert_namespace_import_to_named_imports_95056", "Convert namespace import to named imports"),
+        Convert_named_imports_to_namespace_import: diag(95057, DiagnosticCategory.Message, "Convert_named_imports_to_namespace_import_95057", "Convert named imports to namespace import"),
+    };
+}
\ No newline at end of file
diff --git a/src/parser/diagnosticMessages.generated.json b/src/parser/diagnosticMessages.generated.json
new file mode 100644
index 00000000000..1869d9e43e7
--- /dev/null
+++ b/src/parser/diagnosticMessages.generated.json
@@ -0,0 +1,1098 @@
+{
+  "Unterminated_string_literal_1002" : "Unterminated string literal.",
+  "Identifier_expected_1003" : "Identifier expected.",
+  "_0_expected_1005" : "'{0}' expected.",
+  "A_file_cannot_have_a_reference_to_itself_1006" : "A file cannot have a reference to itself.",
+  "Trailing_comma_not_allowed_1009" : "Trailing comma not allowed.",
+  "Asterisk_Slash_expected_1010" : "'*/' expected.",
+  "An_element_access_expression_should_take_an_argument_1011" : "An element access expression should take an argument.",
+  "Unexpected_token_1012" : "Unexpected token.",
+  "A_rest_parameter_or_binding_pattern_may_not_have_a_trailing_comma_1013" : "A rest parameter or binding pattern may not have a trailing comma.",
+  "A_rest_parameter_must_be_last_in_a_parameter_list_1014" : "A rest parameter must be last in a parameter list.",
+  "Parameter_cannot_have_question_mark_and_initializer_1015" : "Parameter cannot have question mark and initializer.",
+  "A_required_parameter_cannot_follow_an_optional_parameter_1016" : "A required parameter cannot follow an optional parameter.",
+  "An_index_signature_cannot_have_a_rest_parameter_1017" : "An index signature cannot have a rest parameter.",
+  "An_index_signature_parameter_cannot_have_an_accessibility_modifier_1018" : "An index signature parameter cannot have an accessibility modifier.",
+  "An_index_signature_parameter_cannot_have_a_question_mark_1019" : "An index signature parameter cannot have a question mark.",
+  "An_index_signature_parameter_cannot_have_an_initializer_1020" : "An index signature parameter cannot have an initializer.",
+  "An_index_signature_must_have_a_type_annotation_1021" : "An index signature must have a type annotation.",
+  "An_index_signature_parameter_must_have_a_type_annotation_1022" : "An index signature parameter must have a type annotation.",
+  "An_index_signature_parameter_type_must_be_string_or_number_1023" : "An index signature parameter type must be 'string' or 'number'.",
+  "readonly_modifier_can_only_appear_on_a_property_declaration_or_index_signature_1024" : "'readonly' modifier can only appear on a property declaration or index signature.",
+  "Accessibility_modifier_already_seen_1028" : "Accessibility modifier already seen.",
+  "_0_modifier_must_precede_1_modifier_1029" : "'{0}' modifier must precede '{1}' modifier.",
+  "_0_modifier_already_seen_1030" : "'{0}' modifier already seen.",
+  "_0_modifier_cannot_appear_on_a_class_element_1031" : "'{0}' modifier cannot appear on a class element.",
+  "super_must_be_followed_by_an_argument_list_or_member_access_1034" : "'super' must be followed by an argument list or member access.",
+  "Only_ambient_modules_can_use_quoted_names_1035" : "Only ambient modules can use quoted names.",
+  "Statements_are_not_allowed_in_ambient_contexts_1036" : "Statements are not allowed in ambient contexts.",
+  "A_declare_modifier_cannot_be_used_in_an_already_ambient_context_1038" : "A 'declare' modifier cannot be used in an already ambient context.",
+  "Initializers_are_not_allowed_in_ambient_contexts_1039" : "Initializers are not allowed in ambient contexts.",
+  "_0_modifier_cannot_be_used_in_an_ambient_context_1040" : "'{0}' modifier cannot be used in an ambient context.",
+  "_0_modifier_cannot_be_used_with_a_class_declaration_1041" : "'{0}' modifier cannot be used with a class declaration.",
+  "_0_modifier_cannot_be_used_here_1042" : "'{0}' modifier cannot be used here.",
+  "_0_modifier_cannot_appear_on_a_data_property_1043" : "'{0}' modifier cannot appear on a data property.",
+  "_0_modifier_cannot_appear_on_a_module_or_namespace_element_1044" : "'{0}' modifier cannot appear on a module or namespace element.",
+  "A_0_modifier_cannot_be_used_with_an_interface_declaration_1045" : "A '{0}' modifier cannot be used with an interface declaration.",
+  "A_declare_modifier_is_required_for_a_top_level_declaration_in_a_d_ts_file_1046" : "A 'declare' modifier is required for a top level declaration in a .d.ts file.",
+  "A_rest_parameter_cannot_be_optional_1047" : "A rest parameter cannot be optional.",
+  "A_rest_parameter_cannot_have_an_initializer_1048" : "A rest parameter cannot have an initializer.",
+  "A_set_accessor_must_have_exactly_one_parameter_1049" : "A 'set' accessor must have exactly one parameter.",
+  "A_set_accessor_cannot_have_an_optional_parameter_1051" : "A 'set' accessor cannot have an optional parameter.",
+  "A_set_accessor_parameter_cannot_have_an_initializer_1052" : "A 'set' accessor parameter cannot have an initializer.",
+  "A_set_accessor_cannot_have_rest_parameter_1053" : "A 'set' accessor cannot have rest parameter.",
+  "A_get_accessor_cannot_have_parameters_1054" : "A 'get' accessor cannot have parameters.",
+  "Type_0_is_not_a_valid_async_function_return_type_in_ES5_SlashES3_because_it_does_not_refer_to_a_Prom_1055" : "Type '{0}' is not a valid async function return type in ES5/ES3 because it does not refer to a Promise-compatible constructor value.",
+  "Accessors_are_only_available_when_targeting_ECMAScript_5_and_higher_1056" : "Accessors are only available when targeting ECMAScript 5 and higher.",
+  "An_async_function_or_method_must_have_a_valid_awaitable_return_type_1057" : "An async function or method must have a valid awaitable return type.",
+  "The_return_type_of_an_async_function_must_either_be_a_valid_promise_or_must_not_contain_a_callable_t_1058" : "The return type of an async function must either be a valid promise or must not contain a callable 'then' member.",
+  "A_promise_must_have_a_then_method_1059" : "A promise must have a 'then' method.",
+  "The_first_parameter_of_the_then_method_of_a_promise_must_be_a_callback_1060" : "The first parameter of the 'then' method of a promise must be a callback.",
+  "Enum_member_must_have_initializer_1061" : "Enum member must have initializer.",
+  "Type_is_referenced_directly_or_indirectly_in_the_fulfillment_callback_of_its_own_then_method_1062" : "Type is referenced directly or indirectly in the fulfillment callback of its own 'then' method.",
+  "An_export_assignment_cannot_be_used_in_a_namespace_1063" : "An export assignment cannot be used in a namespace.",
+  "The_return_type_of_an_async_function_or_method_must_be_the_global_Promise_T_type_1064" : "The return type of an async function or method must be the global Promise<T> type.",
+  "In_ambient_enum_declarations_member_initializer_must_be_constant_expression_1066" : "In ambient enum declarations member initializer must be constant expression.",
+  "Unexpected_token_A_constructor_method_accessor_or_property_was_expected_1068" : "Unexpected token. A constructor, method, accessor, or property was expected.",
+  "Unexpected_token_A_type_parameter_name_was_expected_without_curly_braces_1069" : "Unexpected token. A type parameter name was expected without curly braces.",
+  "_0_modifier_cannot_appear_on_a_type_member_1070" : "'{0}' modifier cannot appear on a type member.",
+  "_0_modifier_cannot_appear_on_an_index_signature_1071" : "'{0}' modifier cannot appear on an index signature.",
+  "A_0_modifier_cannot_be_used_with_an_import_declaration_1079" : "A '{0}' modifier cannot be used with an import declaration.",
+  "Invalid_reference_directive_syntax_1084" : "Invalid 'reference' directive syntax.",
+  "Octal_literals_are_not_available_when_targeting_ECMAScript_5_and_higher_Use_the_syntax_0_1085" : "Octal literals are not available when targeting ECMAScript 5 and higher. Use the syntax '{0}'.",
+  "An_accessor_cannot_be_declared_in_an_ambient_context_1086" : "An accessor cannot be declared in an ambient context.",
+  "_0_modifier_cannot_appear_on_a_constructor_declaration_1089" : "'{0}' modifier cannot appear on a constructor declaration.",
+  "_0_modifier_cannot_appear_on_a_parameter_1090" : "'{0}' modifier cannot appear on a parameter.",
+  "Only_a_single_variable_declaration_is_allowed_in_a_for_in_statement_1091" : "Only a single variable declaration is allowed in a 'for...in' statement.",
+  "Type_parameters_cannot_appear_on_a_constructor_declaration_1092" : "Type parameters cannot appear on a constructor declaration.",
+  "Type_annotation_cannot_appear_on_a_constructor_declaration_1093" : "Type annotation cannot appear on a constructor declaration.",
+  "An_accessor_cannot_have_type_parameters_1094" : "An accessor cannot have type parameters.",
+  "A_set_accessor_cannot_have_a_return_type_annotation_1095" : "A 'set' accessor cannot have a return type annotation.",
+  "An_index_signature_must_have_exactly_one_parameter_1096" : "An index signature must have exactly one parameter.",
+  "_0_list_cannot_be_empty_1097" : "'{0}' list cannot be empty.",
+  "Type_parameter_list_cannot_be_empty_1098" : "Type parameter list cannot be empty.",
+  "Type_argument_list_cannot_be_empty_1099" : "Type argument list cannot be empty.",
+  "Invalid_use_of_0_in_strict_mode_1100" : "Invalid use of '{0}' in strict mode.",
+  "with_statements_are_not_allowed_in_strict_mode_1101" : "'with' statements are not allowed in strict mode.",
+  "delete_cannot_be_called_on_an_identifier_in_strict_mode_1102" : "'delete' cannot be called on an identifier in strict mode.",
+  "A_for_await_of_statement_is_only_allowed_within_an_async_function_or_async_generator_1103" : "A 'for-await-of' statement is only allowed within an async function or async generator.",
+  "A_continue_statement_can_only_be_used_within_an_enclosing_iteration_statement_1104" : "A 'continue' statement can only be used within an enclosing iteration statement.",
+  "A_break_statement_can_only_be_used_within_an_enclosing_iteration_or_switch_statement_1105" : "A 'break' statement can only be used within an enclosing iteration or switch statement.",
+  "Jump_target_cannot_cross_function_boundary_1107" : "Jump target cannot cross function boundary.",
+  "A_return_statement_can_only_be_used_within_a_function_body_1108" : "A 'return' statement can only be used within a function body.",
+  "Expression_expected_1109" : "Expression expected.",
+  "Type_expected_1110" : "Type expected.",
+  "A_default_clause_cannot_appear_more_than_once_in_a_switch_statement_1113" : "A 'default' clause cannot appear more than once in a 'switch' statement.",
+  "Duplicate_label_0_1114" : "Duplicate label '{0}'.",
+  "A_continue_statement_can_only_jump_to_a_label_of_an_enclosing_iteration_statement_1115" : "A 'continue' statement can only jump to a label of an enclosing iteration statement.",
+  "A_break_statement_can_only_jump_to_a_label_of_an_enclosing_statement_1116" : "A 'break' statement can only jump to a label of an enclosing statement.",
+  "An_object_literal_cannot_have_multiple_properties_with_the_same_name_in_strict_mode_1117" : "An object literal cannot have multiple properties with the same name in strict mode.",
+  "An_object_literal_cannot_have_multiple_get_Slashset_accessors_with_the_same_name_1118" : "An object literal cannot have multiple get/set accessors with the same name.",
+  "An_object_literal_cannot_have_property_and_accessor_with_the_same_name_1119" : "An object literal cannot have property and accessor with the same name.",
+  "An_export_assignment_cannot_have_modifiers_1120" : "An export assignment cannot have modifiers.",
+  "Octal_literals_are_not_allowed_in_strict_mode_1121" : "Octal literals are not allowed in strict mode.",
+  "A_tuple_type_element_list_cannot_be_empty_1122" : "A tuple type element list cannot be empty.",
+  "Variable_declaration_list_cannot_be_empty_1123" : "Variable declaration list cannot be empty.",
+  "Digit_expected_1124" : "Digit expected.",
+  "Hexadecimal_digit_expected_1125" : "Hexadecimal digit expected.",
+  "Unexpected_end_of_text_1126" : "Unexpected end of text.",
+  "Invalid_character_1127" : "Invalid character.",
+  "Declaration_or_statement_expected_1128" : "Declaration or statement expected.",
+  "Statement_expected_1129" : "Statement expected.",
+  "case_or_default_expected_1130" : "'case' or 'default' expected.",
+  "Property_or_signature_expected_1131" : "Property or signature expected.",
+  "Enum_member_expected_1132" : "Enum member expected.",
+  "Variable_declaration_expected_1134" : "Variable declaration expected.",
+  "Argument_expression_expected_1135" : "Argument expression expected.",
+  "Property_assignment_expected_1136" : "Property assignment expected.",
+  "Expression_or_comma_expected_1137" : "Expression or comma expected.",
+  "Parameter_declaration_expected_1138" : "Parameter declaration expected.",
+  "Type_parameter_declaration_expected_1139" : "Type parameter declaration expected.",
+  "Type_argument_expected_1140" : "Type argument expected.",
+  "String_literal_expected_1141" : "String literal expected.",
+  "Line_break_not_permitted_here_1142" : "Line break not permitted here.",
+  "or_expected_1144" : "'{' or ';' expected.",
+  "Declaration_expected_1146" : "Declaration expected.",
+  "Import_declarations_in_a_namespace_cannot_reference_a_module_1147" : "Import declarations in a namespace cannot reference a module.",
+  "Cannot_use_imports_exports_or_module_augmentations_when_module_is_none_1148" : "Cannot use imports, exports, or module augmentations when '--module' is 'none'.",
+  "File_name_0_differs_from_already_included_file_name_1_only_in_casing_1149" : "File name '{0}' differs from already included file name '{1}' only in casing.",
+  "new_T_cannot_be_used_to_create_an_array_Use_new_Array_T_instead_1150" : "'new T[]' cannot be used to create an array. Use 'new Array<T>()' instead.",
+  "const_declarations_must_be_initialized_1155" : "'const' declarations must be initialized.",
+  "const_declarations_can_only_be_declared_inside_a_block_1156" : "'const' declarations can only be declared inside a block.",
+  "let_declarations_can_only_be_declared_inside_a_block_1157" : "'let' declarations can only be declared inside a block.",
+  "Unterminated_template_literal_1160" : "Unterminated template literal.",
+  "Unterminated_regular_expression_literal_1161" : "Unterminated regular expression literal.",
+  "An_object_member_cannot_be_declared_optional_1162" : "An object member cannot be declared optional.",
+  "A_yield_expression_is_only_allowed_in_a_generator_body_1163" : "A 'yield' expression is only allowed in a generator body.",
+  "Computed_property_names_are_not_allowed_in_enums_1164" : "Computed property names are not allowed in enums.",
+  "A_computed_property_name_in_an_ambient_context_must_refer_to_an_expression_whose_type_is_a_literal_t_1165" : "A computed property name in an ambient context must refer to an expression whose type is a literal type or a 'unique symbol' type.",
+  "A_computed_property_name_in_a_class_property_declaration_must_refer_to_an_expression_whose_type_is_a_1166" : "A computed property name in a class property declaration must refer to an expression whose type is a literal type or a 'unique symbol' type.",
+  "A_computed_property_name_in_a_method_overload_must_refer_to_an_expression_whose_type_is_a_literal_ty_1168" : "A computed property name in a method overload must refer to an expression whose type is a literal type or a 'unique symbol' type.",
+  "A_computed_property_name_in_an_interface_must_refer_to_an_expression_whose_type_is_a_literal_type_or_1169" : "A computed property name in an interface must refer to an expression whose type is a literal type or a 'unique symbol' type.",
+  "A_computed_property_name_in_a_type_literal_must_refer_to_an_expression_whose_type_is_a_literal_type__1170" : "A computed property name in a type literal must refer to an expression whose type is a literal type or a 'unique symbol' type.",
+  "A_comma_expression_is_not_allowed_in_a_computed_property_name_1171" : "A comma expression is not allowed in a computed property name.",
+  "extends_clause_already_seen_1172" : "'extends' clause already seen.",
+  "extends_clause_must_precede_implements_clause_1173" : "'extends' clause must precede 'implements' clause.",
+  "Classes_can_only_extend_a_single_class_1174" : "Classes can only extend a single class.",
+  "implements_clause_already_seen_1175" : "'implements' clause already seen.",
+  "Interface_declaration_cannot_have_implements_clause_1176" : "Interface declaration cannot have 'implements' clause.",
+  "Binary_digit_expected_1177" : "Binary digit expected.",
+  "Octal_digit_expected_1178" : "Octal digit expected.",
+  "Unexpected_token_expected_1179" : "Unexpected token. '{' expected.",
+  "Property_destructuring_pattern_expected_1180" : "Property destructuring pattern expected.",
+  "Array_element_destructuring_pattern_expected_1181" : "Array element destructuring pattern expected.",
+  "A_destructuring_declaration_must_have_an_initializer_1182" : "A destructuring declaration must have an initializer.",
+  "An_implementation_cannot_be_declared_in_ambient_contexts_1183" : "An implementation cannot be declared in ambient contexts.",
+  "Modifiers_cannot_appear_here_1184" : "Modifiers cannot appear here.",
+  "Merge_conflict_marker_encountered_1185" : "Merge conflict marker encountered.",
+  "A_rest_element_cannot_have_an_initializer_1186" : "A rest element cannot have an initializer.",
+  "A_parameter_property_may_not_be_declared_using_a_binding_pattern_1187" : "A parameter property may not be declared using a binding pattern.",
+  "Only_a_single_variable_declaration_is_allowed_in_a_for_of_statement_1188" : "Only a single variable declaration is allowed in a 'for...of' statement.",
+  "The_variable_declaration_of_a_for_in_statement_cannot_have_an_initializer_1189" : "The variable declaration of a 'for...in' statement cannot have an initializer.",
+  "The_variable_declaration_of_a_for_of_statement_cannot_have_an_initializer_1190" : "The variable declaration of a 'for...of' statement cannot have an initializer.",
+  "An_import_declaration_cannot_have_modifiers_1191" : "An import declaration cannot have modifiers.",
+  "Module_0_has_no_default_export_1192" : "Module '{0}' has no default export.",
+  "An_export_declaration_cannot_have_modifiers_1193" : "An export declaration cannot have modifiers.",
+  "Export_declarations_are_not_permitted_in_a_namespace_1194" : "Export declarations are not permitted in a namespace.",
+  "Catch_clause_variable_cannot_have_a_type_annotation_1196" : "Catch clause variable cannot have a type annotation.",
+  "Catch_clause_variable_cannot_have_an_initializer_1197" : "Catch clause variable cannot have an initializer.",
+  "An_extended_Unicode_escape_value_must_be_between_0x0_and_0x10FFFF_inclusive_1198" : "An extended Unicode escape value must be between 0x0 and 0x10FFFF inclusive.",
+  "Unterminated_Unicode_escape_sequence_1199" : "Unterminated Unicode escape sequence.",
+  "Line_terminator_not_permitted_before_arrow_1200" : "Line terminator not permitted before arrow.",
+  "Import_assignment_cannot_be_used_when_targeting_ECMAScript_modules_Consider_using_import_Asterisk_as_1202" : "Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from \"mod\"', 'import {a} from \"mod\"', 'import d from \"mod\"', or another module format instead.",
+  "Export_assignment_cannot_be_used_when_targeting_ECMAScript_modules_Consider_using_export_default_or__1203" : "Export assignment cannot be used when targeting ECMAScript modules. Consider using 'export default' or another module format instead.",
+  "Cannot_re_export_a_type_when_the_isolatedModules_flag_is_provided_1205" : "Cannot re-export a type when the '--isolatedModules' flag is provided.",
+  "Decorators_are_not_valid_here_1206" : "Decorators are not valid here.",
+  "Decorators_cannot_be_applied_to_multiple_get_Slashset_accessors_of_the_same_name_1207" : "Decorators cannot be applied to multiple get/set accessors of the same name.",
+  "Cannot_compile_namespaces_when_the_isolatedModules_flag_is_provided_1208" : "Cannot compile namespaces when the '--isolatedModules' flag is provided.",
+  "Ambient_const_enums_are_not_allowed_when_the_isolatedModules_flag_is_provided_1209" : "Ambient const enums are not allowed when the '--isolatedModules' flag is provided.",
+  "Invalid_use_of_0_Class_definitions_are_automatically_in_strict_mode_1210" : "Invalid use of '{0}'. Class definitions are automatically in strict mode.",
+  "A_class_declaration_without_the_default_modifier_must_have_a_name_1211" : "A class declaration without the 'default' modifier must have a name.",
+  "Identifier_expected_0_is_a_reserved_word_in_strict_mode_1212" : "Identifier expected. '{0}' is a reserved word in strict mode.",
+  "Identifier_expected_0_is_a_reserved_word_in_strict_mode_Class_definitions_are_automatically_in_stric_1213" : "Identifier expected. '{0}' is a reserved word in strict mode. Class definitions are automatically in strict mode.",
+  "Identifier_expected_0_is_a_reserved_word_in_strict_mode_Modules_are_automatically_in_strict_mode_1214" : "Identifier expected. '{0}' is a reserved word in strict mode. Modules are automatically in strict mode.",
+  "Invalid_use_of_0_Modules_are_automatically_in_strict_mode_1215" : "Invalid use of '{0}'. Modules are automatically in strict mode.",
+  "Identifier_expected_esModule_is_reserved_as_an_exported_marker_when_transforming_ECMAScript_modules_1216" : "Identifier expected. '__esModule' is reserved as an exported marker when transforming ECMAScript modules.",
+  "Export_assignment_is_not_supported_when_module_flag_is_system_1218" : "Export assignment is not supported when '--module' flag is 'system'.",
+  "Experimental_support_for_decorators_is_a_feature_that_is_subject_to_change_in_a_future_release_Set_t_1219" : "Experimental support for decorators is a feature that is subject to change in a future release. Set the 'experimentalDecorators' option to remove this warning.",
+  "Generators_are_only_available_when_targeting_ECMAScript_2015_or_higher_1220" : "Generators are only available when targeting ECMAScript 2015 or higher.",
+  "Generators_are_not_allowed_in_an_ambient_context_1221" : "Generators are not allowed in an ambient context.",
+  "An_overload_signature_cannot_be_declared_as_a_generator_1222" : "An overload signature cannot be declared as a generator.",
+  "_0_tag_already_specified_1223" : "'{0}' tag already specified.",
+  "Signature_0_must_be_a_type_predicate_1224" : "Signature '{0}' must be a type predicate.",
+  "Cannot_find_parameter_0_1225" : "Cannot find parameter '{0}'.",
+  "Type_predicate_0_is_not_assignable_to_1_1226" : "Type predicate '{0}' is not assignable to '{1}'.",
+  "Parameter_0_is_not_in_the_same_position_as_parameter_1_1227" : "Parameter '{0}' is not in the same position as parameter '{1}'.",
+  "A_type_predicate_is_only_allowed_in_return_type_position_for_functions_and_methods_1228" : "A type predicate is only allowed in return type position for functions and methods.",
+  "A_type_predicate_cannot_reference_a_rest_parameter_1229" : "A type predicate cannot reference a rest parameter.",
+  "A_type_predicate_cannot_reference_element_0_in_a_binding_pattern_1230" : "A type predicate cannot reference element '{0}' in a binding pattern.",
+  "An_export_assignment_can_only_be_used_in_a_module_1231" : "An export assignment can only be used in a module.",
+  "An_import_declaration_can_only_be_used_in_a_namespace_or_module_1232" : "An import declaration can only be used in a namespace or module.",
+  "An_export_declaration_can_only_be_used_in_a_module_1233" : "An export declaration can only be used in a module.",
+  "An_ambient_module_declaration_is_only_allowed_at_the_top_level_in_a_file_1234" : "An ambient module declaration is only allowed at the top level in a file.",
+  "A_namespace_declaration_is_only_allowed_in_a_namespace_or_module_1235" : "A namespace declaration is only allowed in a namespace or module.",
+  "The_return_type_of_a_property_decorator_function_must_be_either_void_or_any_1236" : "The return type of a property decorator function must be either 'void' or 'any'.",
+  "The_return_type_of_a_parameter_decorator_function_must_be_either_void_or_any_1237" : "The return type of a parameter decorator function must be either 'void' or 'any'.",
+  "Unable_to_resolve_signature_of_class_decorator_when_called_as_an_expression_1238" : "Unable to resolve signature of class decorator when called as an expression.",
+  "Unable_to_resolve_signature_of_parameter_decorator_when_called_as_an_expression_1239" : "Unable to resolve signature of parameter decorator when called as an expression.",
+  "Unable_to_resolve_signature_of_property_decorator_when_called_as_an_expression_1240" : "Unable to resolve signature of property decorator when called as an expression.",
+  "Unable_to_resolve_signature_of_method_decorator_when_called_as_an_expression_1241" : "Unable to resolve signature of method decorator when called as an expression.",
+  "abstract_modifier_can_only_appear_on_a_class_method_or_property_declaration_1242" : "'abstract' modifier can only appear on a class, method, or property declaration.",
+  "_0_modifier_cannot_be_used_with_1_modifier_1243" : "'{0}' modifier cannot be used with '{1}' modifier.",
+  "Abstract_methods_can_only_appear_within_an_abstract_class_1244" : "Abstract methods can only appear within an abstract class.",
+  "Method_0_cannot_have_an_implementation_because_it_is_marked_abstract_1245" : "Method '{0}' cannot have an implementation because it is marked abstract.",
+  "An_interface_property_cannot_have_an_initializer_1246" : "An interface property cannot have an initializer.",
+  "A_type_literal_property_cannot_have_an_initializer_1247" : "A type literal property cannot have an initializer.",
+  "A_class_member_cannot_have_the_0_keyword_1248" : "A class member cannot have the '{0}' keyword.",
+  "A_decorator_can_only_decorate_a_method_implementation_not_an_overload_1249" : "A decorator can only decorate a method implementation, not an overload.",
+  "Function_declarations_are_not_allowed_inside_blocks_in_strict_mode_when_targeting_ES3_or_ES5_1250" : "Function declarations are not allowed inside blocks in strict mode when targeting 'ES3' or 'ES5'.",
+  "Function_declarations_are_not_allowed_inside_blocks_in_strict_mode_when_targeting_ES3_or_ES5_Class_d_1251" : "Function declarations are not allowed inside blocks in strict mode when targeting 'ES3' or 'ES5'. Class definitions are automatically in strict mode.",
+  "Function_declarations_are_not_allowed_inside_blocks_in_strict_mode_when_targeting_ES3_or_ES5_Modules_1252" : "Function declarations are not allowed inside blocks in strict mode when targeting 'ES3' or 'ES5'. Modules are automatically in strict mode.",
+  "_0_tag_cannot_be_used_independently_as_a_top_level_JSDoc_tag_1253" : "'{0}' tag cannot be used independently as a top level JSDoc tag.",
+  "A_const_initializer_in_an_ambient_context_must_be_a_string_or_numeric_literal_1254" : "A 'const' initializer in an ambient context must be a string or numeric literal.",
+  "A_definite_assignment_assertion_is_not_permitted_in_this_context_1255" : "A definite assignment assertion '!' is not permitted in this context.",
+  "with_statements_are_not_allowed_in_an_async_function_block_1300" : "'with' statements are not allowed in an async function block.",
+  "await_expression_is_only_allowed_within_an_async_function_1308" : "'await' expression is only allowed within an async function.",
+  "can_only_be_used_in_an_object_literal_property_inside_a_destructuring_assignment_1312" : "'=' can only be used in an object literal property inside a destructuring assignment.",
+  "The_body_of_an_if_statement_cannot_be_the_empty_statement_1313" : "The body of an 'if' statement cannot be the empty statement.",
+  "Global_module_exports_may_only_appear_in_module_files_1314" : "Global module exports may only appear in module files.",
+  "Global_module_exports_may_only_appear_in_declaration_files_1315" : "Global module exports may only appear in declaration files.",
+  "Global_module_exports_may_only_appear_at_top_level_1316" : "Global module exports may only appear at top level.",
+  "A_parameter_property_cannot_be_declared_using_a_rest_parameter_1317" : "A parameter property cannot be declared using a rest parameter.",
+  "An_abstract_accessor_cannot_have_an_implementation_1318" : "An abstract accessor cannot have an implementation.",
+  "A_default_export_can_only_be_used_in_an_ECMAScript_style_module_1319" : "A default export can only be used in an ECMAScript-style module.",
+  "Type_of_await_operand_must_either_be_a_valid_promise_or_must_not_contain_a_callable_then_member_1320" : "Type of 'await' operand must either be a valid promise or must not contain a callable 'then' member.",
+  "Type_of_yield_operand_in_an_async_generator_must_either_be_a_valid_promise_or_must_not_contain_a_cal_1321" : "Type of 'yield' operand in an async generator must either be a valid promise or must not contain a callable 'then' member.",
+  "Type_of_iterated_elements_of_a_yield_Asterisk_operand_must_either_be_a_valid_promise_or_must_not_con_1322" : "Type of iterated elements of a 'yield*' operand must either be a valid promise or must not contain a callable 'then' member.",
+  "Dynamic_import_is_only_supported_when_module_flag_is_commonjs_or_esNext_1323" : "Dynamic import is only supported when '--module' flag is 'commonjs' or 'esNext'.",
+  "Dynamic_import_must_have_one_specifier_as_an_argument_1324" : "Dynamic import must have one specifier as an argument.",
+  "Specifier_of_dynamic_import_cannot_be_spread_element_1325" : "Specifier of dynamic import cannot be spread element.",
+  "Dynamic_import_cannot_have_type_arguments_1326" : "Dynamic import cannot have type arguments",
+  "String_literal_with_double_quotes_expected_1327" : "String literal with double quotes expected.",
+  "Property_value_can_only_be_string_literal_numeric_literal_true_false_null_object_literal_or_array_li_1328" : "Property value can only be string literal, numeric literal, 'true', 'false', 'null', object literal or array literal.",
+  "_0_accepts_too_few_arguments_to_be_used_as_a_decorator_here_Did_you_mean_to_call_it_first_and_write__1329" : "'{0}' accepts too few arguments to be used as a decorator here. Did you mean to call it first and write '@{0}()'?",
+  "A_property_of_an_interface_or_type_literal_whose_type_is_a_unique_symbol_type_must_be_readonly_1330" : "A property of an interface or type literal whose type is a 'unique symbol' type must be 'readonly'.",
+  "A_property_of_a_class_whose_type_is_a_unique_symbol_type_must_be_both_static_and_readonly_1331" : "A property of a class whose type is a 'unique symbol' type must be both 'static' and 'readonly'.",
+  "A_variable_whose_type_is_a_unique_symbol_type_must_be_const_1332" : "A variable whose type is a 'unique symbol' type must be 'const'.",
+  "unique_symbol_types_may_not_be_used_on_a_variable_declaration_with_a_binding_name_1333" : "'unique symbol' types may not be used on a variable declaration with a binding name.",
+  "unique_symbol_types_are_only_allowed_on_variables_in_a_variable_statement_1334" : "'unique symbol' types are only allowed on variables in a variable statement.",
+  "unique_symbol_types_are_not_allowed_here_1335" : "'unique symbol' types are not allowed here.",
+  "An_index_signature_parameter_type_cannot_be_a_type_alias_Consider_writing_0_Colon_1_Colon_2_instead_1336" : "An index signature parameter type cannot be a type alias. Consider writing '[{0}: {1}]: {2}' instead.",
+  "An_index_signature_parameter_type_cannot_be_a_union_type_Consider_using_a_mapped_object_type_instead_1337" : "An index signature parameter type cannot be a union type. Consider using a mapped object type instead.",
+  "infer_declarations_are_only_permitted_in_the_extends_clause_of_a_conditional_type_1338" : "'infer' declarations are only permitted in the 'extends' clause of a conditional type.",
+  "Module_0_does_not_refer_to_a_value_but_is_used_as_a_value_here_1339" : "Module '{0}' does not refer to a value, but is used as a value here.",
+  "Module_0_does_not_refer_to_a_type_but_is_used_as_a_type_here_1340" : "Module '{0}' does not refer to a type, but is used as a type here.",
+  "Type_arguments_cannot_be_used_here_1342" : "Type arguments cannot be used here.",
+  "The_import_meta_meta_property_is_only_allowed_using_ESNext_for_the_target_and_module_compiler_option_1343" : "The 'import.meta' meta-property is only allowed using 'ESNext' for the 'target' and 'module' compiler options.",
+  "Duplicate_identifier_0_2300" : "Duplicate identifier '{0}'.",
+  "Initializer_of_instance_member_variable_0_cannot_reference_identifier_1_declared_in_the_constructor_2301" : "Initializer of instance member variable '{0}' cannot reference identifier '{1}' declared in the constructor.",
+  "Static_members_cannot_reference_class_type_parameters_2302" : "Static members cannot reference class type parameters.",
+  "Circular_definition_of_import_alias_0_2303" : "Circular definition of import alias '{0}'.",
+  "Cannot_find_name_0_2304" : "Cannot find name '{0}'.",
+  "Module_0_has_no_exported_member_1_2305" : "Module '{0}' has no exported member '{1}'.",
+  "File_0_is_not_a_module_2306" : "File '{0}' is not a module.",
+  "Cannot_find_module_0_2307" : "Cannot find module '{0}'.",
+  "Module_0_has_already_exported_a_member_named_1_Consider_explicitly_re_exporting_to_resolve_the_ambig_2308" : "Module {0} has already exported a member named '{1}'. Consider explicitly re-exporting to resolve the ambiguity.",
+  "An_export_assignment_cannot_be_used_in_a_module_with_other_exported_elements_2309" : "An export assignment cannot be used in a module with other exported elements.",
+  "Type_0_recursively_references_itself_as_a_base_type_2310" : "Type '{0}' recursively references itself as a base type.",
+  "A_class_may_only_extend_another_class_2311" : "A class may only extend another class.",
+  "An_interface_may_only_extend_a_class_or_another_interface_2312" : "An interface may only extend a class or another interface.",
+  "Type_parameter_0_has_a_circular_constraint_2313" : "Type parameter '{0}' has a circular constraint.",
+  "Generic_type_0_requires_1_type_argument_s_2314" : "Generic type '{0}' requires {1} type argument(s).",
+  "Type_0_is_not_generic_2315" : "Type '{0}' is not generic.",
+  "Global_type_0_must_be_a_class_or_interface_type_2316" : "Global type '{0}' must be a class or interface type.",
+  "Global_type_0_must_have_1_type_parameter_s_2317" : "Global type '{0}' must have {1} type parameter(s).",
+  "Cannot_find_global_type_0_2318" : "Cannot find global type '{0}'.",
+  "Named_property_0_of_types_1_and_2_are_not_identical_2319" : "Named property '{0}' of types '{1}' and '{2}' are not identical.",
+  "Interface_0_cannot_simultaneously_extend_types_1_and_2_2320" : "Interface '{0}' cannot simultaneously extend types '{1}' and '{2}'.",
+  "Excessive_stack_depth_comparing_types_0_and_1_2321" : "Excessive stack depth comparing types '{0}' and '{1}'.",
+  "Type_0_is_not_assignable_to_type_1_2322" : "Type '{0}' is not assignable to type '{1}'.",
+  "Cannot_redeclare_exported_variable_0_2323" : "Cannot redeclare exported variable '{0}'.",
+  "Property_0_is_missing_in_type_1_2324" : "Property '{0}' is missing in type '{1}'.",
+  "Property_0_is_private_in_type_1_but_not_in_type_2_2325" : "Property '{0}' is private in type '{1}' but not in type '{2}'.",
+  "Types_of_property_0_are_incompatible_2326" : "Types of property '{0}' are incompatible.",
+  "Property_0_is_optional_in_type_1_but_required_in_type_2_2327" : "Property '{0}' is optional in type '{1}' but required in type '{2}'.",
+  "Types_of_parameters_0_and_1_are_incompatible_2328" : "Types of parameters '{0}' and '{1}' are incompatible.",
+  "Index_signature_is_missing_in_type_0_2329" : "Index signature is missing in type '{0}'.",
+  "Index_signatures_are_incompatible_2330" : "Index signatures are incompatible.",
+  "this_cannot_be_referenced_in_a_module_or_namespace_body_2331" : "'this' cannot be referenced in a module or namespace body.",
+  "this_cannot_be_referenced_in_current_location_2332" : "'this' cannot be referenced in current location.",
+  "this_cannot_be_referenced_in_constructor_arguments_2333" : "'this' cannot be referenced in constructor arguments.",
+  "this_cannot_be_referenced_in_a_static_property_initializer_2334" : "'this' cannot be referenced in a static property initializer.",
+  "super_can_only_be_referenced_in_a_derived_class_2335" : "'super' can only be referenced in a derived class.",
+  "super_cannot_be_referenced_in_constructor_arguments_2336" : "'super' cannot be referenced in constructor arguments.",
+  "Super_calls_are_not_permitted_outside_constructors_or_in_nested_functions_inside_constructors_2337" : "Super calls are not permitted outside constructors or in nested functions inside constructors.",
+  "super_property_access_is_permitted_only_in_a_constructor_member_function_or_member_accessor_of_a_der_2338" : "'super' property access is permitted only in a constructor, member function, or member accessor of a derived class.",
+  "Property_0_does_not_exist_on_type_1_2339" : "Property '{0}' does not exist on type '{1}'.",
+  "Only_public_and_protected_methods_of_the_base_class_are_accessible_via_the_super_keyword_2340" : "Only public and protected methods of the base class are accessible via the 'super' keyword.",
+  "Property_0_is_private_and_only_accessible_within_class_1_2341" : "Property '{0}' is private and only accessible within class '{1}'.",
+  "An_index_expression_argument_must_be_of_type_string_number_symbol_or_any_2342" : "An index expression argument must be of type 'string', 'number', 'symbol', or 'any'.",
+  "This_syntax_requires_an_imported_helper_named_1_but_module_0_has_no_exported_member_1_2343" : "This syntax requires an imported helper named '{1}', but module '{0}' has no exported member '{1}'.",
+  "Type_0_does_not_satisfy_the_constraint_1_2344" : "Type '{0}' does not satisfy the constraint '{1}'.",
+  "Argument_of_type_0_is_not_assignable_to_parameter_of_type_1_2345" : "Argument of type '{0}' is not assignable to parameter of type '{1}'.",
+  "Call_target_does_not_contain_any_signatures_2346" : "Call target does not contain any signatures.",
+  "Untyped_function_calls_may_not_accept_type_arguments_2347" : "Untyped function calls may not accept type arguments.",
+  "Value_of_type_0_is_not_callable_Did_you_mean_to_include_new_2348" : "Value of type '{0}' is not callable. Did you mean to include 'new'?",
+  "Cannot_invoke_an_expression_whose_type_lacks_a_call_signature_Type_0_has_no_compatible_call_signatur_2349" : "Cannot invoke an expression whose type lacks a call signature. Type '{0}' has no compatible call signatures.",
+  "Only_a_void_function_can_be_called_with_the_new_keyword_2350" : "Only a void function can be called with the 'new' keyword.",
+  "Cannot_use_new_with_an_expression_whose_type_lacks_a_call_or_construct_signature_2351" : "Cannot use 'new' with an expression whose type lacks a call or construct signature.",
+  "Type_0_cannot_be_converted_to_type_1_2352" : "Type '{0}' cannot be converted to type '{1}'.",
+  "Object_literal_may_only_specify_known_properties_and_0_does_not_exist_in_type_1_2353" : "Object literal may only specify known properties, and '{0}' does not exist in type '{1}'.",
+  "This_syntax_requires_an_imported_helper_but_module_0_cannot_be_found_2354" : "This syntax requires an imported helper but module '{0}' cannot be found.",
+  "A_function_whose_declared_type_is_neither_void_nor_any_must_return_a_value_2355" : "A function whose declared type is neither 'void' nor 'any' must return a value.",
+  "An_arithmetic_operand_must_be_of_type_any_number_or_an_enum_type_2356" : "An arithmetic operand must be of type 'any', 'number' or an enum type.",
+  "The_operand_of_an_increment_or_decrement_operator_must_be_a_variable_or_a_property_access_2357" : "The operand of an increment or decrement operator must be a variable or a property access.",
+  "The_left_hand_side_of_an_instanceof_expression_must_be_of_type_any_an_object_type_or_a_type_paramete_2358" : "The left-hand side of an 'instanceof' expression must be of type 'any', an object type or a type parameter.",
+  "The_right_hand_side_of_an_instanceof_expression_must_be_of_type_any_or_of_a_type_assignable_to_the_F_2359" : "The right-hand side of an 'instanceof' expression must be of type 'any' or of a type assignable to the 'Function' interface type.",
+  "The_left_hand_side_of_an_in_expression_must_be_of_type_any_string_number_or_symbol_2360" : "The left-hand side of an 'in' expression must be of type 'any', 'string', 'number', or 'symbol'.",
+  "The_right_hand_side_of_an_in_expression_must_be_of_type_any_an_object_type_or_a_type_parameter_2361" : "The right-hand side of an 'in' expression must be of type 'any', an object type or a type parameter.",
+  "The_left_hand_side_of_an_arithmetic_operation_must_be_of_type_any_number_or_an_enum_type_2362" : "The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.",
+  "The_right_hand_side_of_an_arithmetic_operation_must_be_of_type_any_number_or_an_enum_type_2363" : "The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.",
+  "The_left_hand_side_of_an_assignment_expression_must_be_a_variable_or_a_property_access_2364" : "The left-hand side of an assignment expression must be a variable or a property access.",
+  "Operator_0_cannot_be_applied_to_types_1_and_2_2365" : "Operator '{0}' cannot be applied to types '{1}' and '{2}'.",
+  "Function_lacks_ending_return_statement_and_return_type_does_not_include_undefined_2366" : "Function lacks ending return statement and return type does not include 'undefined'.",
+  "Type_parameter_name_cannot_be_0_2368" : "Type parameter name cannot be '{0}'.",
+  "A_parameter_property_is_only_allowed_in_a_constructor_implementation_2369" : "A parameter property is only allowed in a constructor implementation.",
+  "A_rest_parameter_must_be_of_an_array_type_2370" : "A rest parameter must be of an array type.",
+  "A_parameter_initializer_is_only_allowed_in_a_function_or_constructor_implementation_2371" : "A parameter initializer is only allowed in a function or constructor implementation.",
+  "Parameter_0_cannot_be_referenced_in_its_initializer_2372" : "Parameter '{0}' cannot be referenced in its initializer.",
+  "Initializer_of_parameter_0_cannot_reference_identifier_1_declared_after_it_2373" : "Initializer of parameter '{0}' cannot reference identifier '{1}' declared after it.",
+  "Duplicate_string_index_signature_2374" : "Duplicate string index signature.",
+  "Duplicate_number_index_signature_2375" : "Duplicate number index signature.",
+  "A_super_call_must_be_the_first_statement_in_the_constructor_when_a_class_contains_initialized_proper_2376" : "A 'super' call must be the first statement in the constructor when a class contains initialized properties or has parameter properties.",
+  "Constructors_for_derived_classes_must_contain_a_super_call_2377" : "Constructors for derived classes must contain a 'super' call.",
+  "A_get_accessor_must_return_a_value_2378" : "A 'get' accessor must return a value.",
+  "Getter_and_setter_accessors_do_not_agree_in_visibility_2379" : "Getter and setter accessors do not agree in visibility.",
+  "get_and_set_accessor_must_have_the_same_type_2380" : "'get' and 'set' accessor must have the same type.",
+  "A_signature_with_an_implementation_cannot_use_a_string_literal_type_2381" : "A signature with an implementation cannot use a string literal type.",
+  "Specialized_overload_signature_is_not_assignable_to_any_non_specialized_signature_2382" : "Specialized overload signature is not assignable to any non-specialized signature.",
+  "Overload_signatures_must_all_be_exported_or_non_exported_2383" : "Overload signatures must all be exported or non-exported.",
+  "Overload_signatures_must_all_be_ambient_or_non_ambient_2384" : "Overload signatures must all be ambient or non-ambient.",
+  "Overload_signatures_must_all_be_public_private_or_protected_2385" : "Overload signatures must all be public, private or protected.",
+  "Overload_signatures_must_all_be_optional_or_required_2386" : "Overload signatures must all be optional or required.",
+  "Function_overload_must_be_static_2387" : "Function overload must be static.",
+  "Function_overload_must_not_be_static_2388" : "Function overload must not be static.",
+  "Function_implementation_name_must_be_0_2389" : "Function implementation name must be '{0}'.",
+  "Constructor_implementation_is_missing_2390" : "Constructor implementation is missing.",
+  "Function_implementation_is_missing_or_not_immediately_following_the_declaration_2391" : "Function implementation is missing or not immediately following the declaration.",
+  "Multiple_constructor_implementations_are_not_allowed_2392" : "Multiple constructor implementations are not allowed.",
+  "Duplicate_function_implementation_2393" : "Duplicate function implementation.",
+  "Overload_signature_is_not_compatible_with_function_implementation_2394" : "Overload signature is not compatible with function implementation.",
+  "Individual_declarations_in_merged_declaration_0_must_be_all_exported_or_all_local_2395" : "Individual declarations in merged declaration '{0}' must be all exported or all local.",
+  "Duplicate_identifier_arguments_Compiler_uses_arguments_to_initialize_rest_parameters_2396" : "Duplicate identifier 'arguments'. Compiler uses 'arguments' to initialize rest parameters.",
+  "Declaration_name_conflicts_with_built_in_global_identifier_0_2397" : "Declaration name conflicts with built-in global identifier '{0}'.",
+  "Duplicate_identifier_this_Compiler_uses_variable_declaration_this_to_capture_this_reference_2399" : "Duplicate identifier '_this'. Compiler uses variable declaration '_this' to capture 'this' reference.",
+  "Expression_resolves_to_variable_declaration_this_that_compiler_uses_to_capture_this_reference_2400" : "Expression resolves to variable declaration '_this' that compiler uses to capture 'this' reference.",
+  "Duplicate_identifier_super_Compiler_uses_super_to_capture_base_class_reference_2401" : "Duplicate identifier '_super'. Compiler uses '_super' to capture base class reference.",
+  "Expression_resolves_to_super_that_compiler_uses_to_capture_base_class_reference_2402" : "Expression resolves to '_super' that compiler uses to capture base class reference.",
+  "Subsequent_variable_declarations_must_have_the_same_type_Variable_0_must_be_of_type_1_but_here_has_t_2403" : "Subsequent variable declarations must have the same type.  Variable '{0}' must be of type '{1}', but here has type '{2}'.",
+  "The_left_hand_side_of_a_for_in_statement_cannot_use_a_type_annotation_2404" : "The left-hand side of a 'for...in' statement cannot use a type annotation.",
+  "The_left_hand_side_of_a_for_in_statement_must_be_of_type_string_or_any_2405" : "The left-hand side of a 'for...in' statement must be of type 'string' or 'any'.",
+  "The_left_hand_side_of_a_for_in_statement_must_be_a_variable_or_a_property_access_2406" : "The left-hand side of a 'for...in' statement must be a variable or a property access.",
+  "The_right_hand_side_of_a_for_in_statement_must_be_of_type_any_an_object_type_or_a_type_parameter_but_2407" : "The right-hand side of a 'for...in' statement must be of type 'any', an object type or a type parameter, but here has type '{0}'.",
+  "Setters_cannot_return_a_value_2408" : "Setters cannot return a value.",
+  "Return_type_of_constructor_signature_must_be_assignable_to_the_instance_type_of_the_class_2409" : "Return type of constructor signature must be assignable to the instance type of the class.",
+  "The_with_statement_is_not_supported_All_symbols_in_a_with_block_will_have_type_any_2410" : "The 'with' statement is not supported. All symbols in a 'with' block will have type 'any'.",
+  "Property_0_of_type_1_is_not_assignable_to_string_index_type_2_2411" : "Property '{0}' of type '{1}' is not assignable to string index type '{2}'.",
+  "Property_0_of_type_1_is_not_assignable_to_numeric_index_type_2_2412" : "Property '{0}' of type '{1}' is not assignable to numeric index type '{2}'.",
+  "Numeric_index_type_0_is_not_assignable_to_string_index_type_1_2413" : "Numeric index type '{0}' is not assignable to string index type '{1}'.",
+  "Class_name_cannot_be_0_2414" : "Class name cannot be '{0}'.",
+  "Class_0_incorrectly_extends_base_class_1_2415" : "Class '{0}' incorrectly extends base class '{1}'.",
+  "Property_0_in_type_1_is_not_assignable_to_the_same_property_in_base_type_2_2416" : "Property '{0}' in type '{1}' is not assignable to the same property in base type '{2}'.",
+  "Class_static_side_0_incorrectly_extends_base_class_static_side_1_2417" : "Class static side '{0}' incorrectly extends base class static side '{1}'.",
+  "Class_0_incorrectly_implements_interface_1_2420" : "Class '{0}' incorrectly implements interface '{1}'.",
+  "A_class_may_only_implement_another_class_or_interface_2422" : "A class may only implement another class or interface.",
+  "Class_0_defines_instance_member_function_1_but_extended_class_2_defines_it_as_instance_member_access_2423" : "Class '{0}' defines instance member function '{1}', but extended class '{2}' defines it as instance member accessor.",
+  "Class_0_defines_instance_member_function_1_but_extended_class_2_defines_it_as_instance_member_proper_2424" : "Class '{0}' defines instance member function '{1}', but extended class '{2}' defines it as instance member property.",
+  "Class_0_defines_instance_member_property_1_but_extended_class_2_defines_it_as_instance_member_functi_2425" : "Class '{0}' defines instance member property '{1}', but extended class '{2}' defines it as instance member function.",
+  "Class_0_defines_instance_member_accessor_1_but_extended_class_2_defines_it_as_instance_member_functi_2426" : "Class '{0}' defines instance member accessor '{1}', but extended class '{2}' defines it as instance member function.",
+  "Interface_name_cannot_be_0_2427" : "Interface name cannot be '{0}'.",
+  "All_declarations_of_0_must_have_identical_type_parameters_2428" : "All declarations of '{0}' must have identical type parameters.",
+  "Interface_0_incorrectly_extends_interface_1_2430" : "Interface '{0}' incorrectly extends interface '{1}'.",
+  "Enum_name_cannot_be_0_2431" : "Enum name cannot be '{0}'.",
+  "In_an_enum_with_multiple_declarations_only_one_declaration_can_omit_an_initializer_for_its_first_enu_2432" : "In an enum with multiple declarations, only one declaration can omit an initializer for its first enum element.",
+  "A_namespace_declaration_cannot_be_in_a_different_file_from_a_class_or_function_with_which_it_is_merg_2433" : "A namespace declaration cannot be in a different file from a class or function with which it is merged.",
+  "A_namespace_declaration_cannot_be_located_prior_to_a_class_or_function_with_which_it_is_merged_2434" : "A namespace declaration cannot be located prior to a class or function with which it is merged.",
+  "Ambient_modules_cannot_be_nested_in_other_modules_or_namespaces_2435" : "Ambient modules cannot be nested in other modules or namespaces.",
+  "Ambient_module_declaration_cannot_specify_relative_module_name_2436" : "Ambient module declaration cannot specify relative module name.",
+  "Module_0_is_hidden_by_a_local_declaration_with_the_same_name_2437" : "Module '{0}' is hidden by a local declaration with the same name.",
+  "Import_name_cannot_be_0_2438" : "Import name cannot be '{0}'.",
+  "Import_or_export_declaration_in_an_ambient_module_declaration_cannot_reference_module_through_relati_2439" : "Import or export declaration in an ambient module declaration cannot reference module through relative module name.",
+  "Import_declaration_conflicts_with_local_declaration_of_0_2440" : "Import declaration conflicts with local declaration of '{0}'.",
+  "Duplicate_identifier_0_Compiler_reserves_name_1_in_top_level_scope_of_a_module_2441" : "Duplicate identifier '{0}'. Compiler reserves name '{1}' in top level scope of a module.",
+  "Types_have_separate_declarations_of_a_private_property_0_2442" : "Types have separate declarations of a private property '{0}'.",
+  "Property_0_is_protected_but_type_1_is_not_a_class_derived_from_2_2443" : "Property '{0}' is protected but type '{1}' is not a class derived from '{2}'.",
+  "Property_0_is_protected_in_type_1_but_public_in_type_2_2444" : "Property '{0}' is protected in type '{1}' but public in type '{2}'.",
+  "Property_0_is_protected_and_only_accessible_within_class_1_and_its_subclasses_2445" : "Property '{0}' is protected and only accessible within class '{1}' and its subclasses.",
+  "Property_0_is_protected_and_only_accessible_through_an_instance_of_class_1_2446" : "Property '{0}' is protected and only accessible through an instance of class '{1}'.",
+  "The_0_operator_is_not_allowed_for_boolean_types_Consider_using_1_instead_2447" : "The '{0}' operator is not allowed for boolean types. Consider using '{1}' instead.",
+  "Block_scoped_variable_0_used_before_its_declaration_2448" : "Block-scoped variable '{0}' used before its declaration.",
+  "Class_0_used_before_its_declaration_2449" : "Class '{0}' used before its declaration.",
+  "Enum_0_used_before_its_declaration_2450" : "Enum '{0}' used before its declaration.",
+  "Cannot_redeclare_block_scoped_variable_0_2451" : "Cannot redeclare block-scoped variable '{0}'.",
+  "An_enum_member_cannot_have_a_numeric_name_2452" : "An enum member cannot have a numeric name.",
+  "The_type_argument_for_type_parameter_0_cannot_be_inferred_from_the_usage_Consider_specifying_the_typ_2453" : "The type argument for type parameter '{0}' cannot be inferred from the usage. Consider specifying the type arguments explicitly.",
+  "Variable_0_is_used_before_being_assigned_2454" : "Variable '{0}' is used before being assigned.",
+  "Type_argument_candidate_1_is_not_a_valid_type_argument_because_it_is_not_a_supertype_of_candidate_0_2455" : "Type argument candidate '{1}' is not a valid type argument because it is not a supertype of candidate '{0}'.",
+  "Type_alias_0_circularly_references_itself_2456" : "Type alias '{0}' circularly references itself.",
+  "Type_alias_name_cannot_be_0_2457" : "Type alias name cannot be '{0}'.",
+  "An_AMD_module_cannot_have_multiple_name_assignments_2458" : "An AMD module cannot have multiple name assignments.",
+  "Type_0_has_no_property_1_and_no_string_index_signature_2459" : "Type '{0}' has no property '{1}' and no string index signature.",
+  "Type_0_has_no_property_1_2460" : "Type '{0}' has no property '{1}'.",
+  "Type_0_is_not_an_array_type_2461" : "Type '{0}' is not an array type.",
+  "A_rest_element_must_be_last_in_a_destructuring_pattern_2462" : "A rest element must be last in a destructuring pattern.",
+  "A_binding_pattern_parameter_cannot_be_optional_in_an_implementation_signature_2463" : "A binding pattern parameter cannot be optional in an implementation signature.",
+  "A_computed_property_name_must_be_of_type_string_number_symbol_or_any_2464" : "A computed property name must be of type 'string', 'number', 'symbol', or 'any'.",
+  "this_cannot_be_referenced_in_a_computed_property_name_2465" : "'this' cannot be referenced in a computed property name.",
+  "super_cannot_be_referenced_in_a_computed_property_name_2466" : "'super' cannot be referenced in a computed property name.",
+  "A_computed_property_name_cannot_reference_a_type_parameter_from_its_containing_type_2467" : "A computed property name cannot reference a type parameter from its containing type.",
+  "Cannot_find_global_value_0_2468" : "Cannot find global value '{0}'.",
+  "The_0_operator_cannot_be_applied_to_type_symbol_2469" : "The '{0}' operator cannot be applied to type 'symbol'.",
+  "Symbol_reference_does_not_refer_to_the_global_Symbol_constructor_object_2470" : "'Symbol' reference does not refer to the global Symbol constructor object.",
+  "A_computed_property_name_of_the_form_0_must_be_of_type_symbol_2471" : "A computed property name of the form '{0}' must be of type 'symbol'.",
+  "Spread_operator_in_new_expressions_is_only_available_when_targeting_ECMAScript_5_and_higher_2472" : "Spread operator in 'new' expressions is only available when targeting ECMAScript 5 and higher.",
+  "Enum_declarations_must_all_be_const_or_non_const_2473" : "Enum declarations must all be const or non-const.",
+  "In_const_enum_declarations_member_initializer_must_be_constant_expression_2474" : "In 'const' enum declarations member initializer must be constant expression.",
+  "const_enums_can_only_be_used_in_property_or_index_access_expressions_or_the_right_hand_side_of_an_im_2475" : "'const' enums can only be used in property or index access expressions or the right hand side of an import declaration or export assignment or type query.",
+  "A_const_enum_member_can_only_be_accessed_using_a_string_literal_2476" : "A const enum member can only be accessed using a string literal.",
+  "const_enum_member_initializer_was_evaluated_to_a_non_finite_value_2477" : "'const' enum member initializer was evaluated to a non-finite value.",
+  "const_enum_member_initializer_was_evaluated_to_disallowed_value_NaN_2478" : "'const' enum member initializer was evaluated to disallowed value 'NaN'.",
+  "Property_0_does_not_exist_on_const_enum_1_2479" : "Property '{0}' does not exist on 'const' enum '{1}'.",
+  "let_is_not_allowed_to_be_used_as_a_name_in_let_or_const_declarations_2480" : "'let' is not allowed to be used as a name in 'let' or 'const' declarations.",
+  "Cannot_initialize_outer_scoped_variable_0_in_the_same_scope_as_block_scoped_declaration_1_2481" : "Cannot initialize outer scoped variable '{0}' in the same scope as block scoped declaration '{1}'.",
+  "The_left_hand_side_of_a_for_of_statement_cannot_use_a_type_annotation_2483" : "The left-hand side of a 'for...of' statement cannot use a type annotation.",
+  "Export_declaration_conflicts_with_exported_declaration_of_0_2484" : "Export declaration conflicts with exported declaration of '{0}'.",
+  "The_left_hand_side_of_a_for_of_statement_must_be_a_variable_or_a_property_access_2487" : "The left-hand side of a 'for...of' statement must be a variable or a property access.",
+  "Type_0_must_have_a_Symbol_iterator_method_that_returns_an_iterator_2488" : "Type '{0}' must have a '[Symbol.iterator]()' method that returns an iterator.",
+  "An_iterator_must_have_a_next_method_2489" : "An iterator must have a 'next()' method.",
+  "The_type_returned_by_the_next_method_of_an_iterator_must_have_a_value_property_2490" : "The type returned by the 'next()' method of an iterator must have a 'value' property.",
+  "The_left_hand_side_of_a_for_in_statement_cannot_be_a_destructuring_pattern_2491" : "The left-hand side of a 'for...in' statement cannot be a destructuring pattern.",
+  "Cannot_redeclare_identifier_0_in_catch_clause_2492" : "Cannot redeclare identifier '{0}' in catch clause.",
+  "Tuple_type_0_with_length_1_cannot_be_assigned_to_tuple_with_length_2_2493" : "Tuple type '{0}' with length '{1}' cannot be assigned to tuple with length '{2}'.",
+  "Using_a_string_in_a_for_of_statement_is_only_supported_in_ECMAScript_5_and_higher_2494" : "Using a string in a 'for...of' statement is only supported in ECMAScript 5 and higher.",
+  "Type_0_is_not_an_array_type_or_a_string_type_2495" : "Type '{0}' is not an array type or a string type.",
+  "The_arguments_object_cannot_be_referenced_in_an_arrow_function_in_ES3_and_ES5_Consider_using_a_stand_2496" : "The 'arguments' object cannot be referenced in an arrow function in ES3 and ES5. Consider using a standard function expression.",
+  "Module_0_resolves_to_a_non_module_entity_and_cannot_be_imported_using_this_construct_2497" : "Module '{0}' resolves to a non-module entity and cannot be imported using this construct.",
+  "Module_0_uses_export_and_cannot_be_used_with_export_Asterisk_2498" : "Module '{0}' uses 'export =' and cannot be used with 'export *'.",
+  "An_interface_can_only_extend_an_identifier_Slashqualified_name_with_optional_type_arguments_2499" : "An interface can only extend an identifier/qualified-name with optional type arguments.",
+  "A_class_can_only_implement_an_identifier_Slashqualified_name_with_optional_type_arguments_2500" : "A class can only implement an identifier/qualified-name with optional type arguments.",
+  "A_rest_element_cannot_contain_a_binding_pattern_2501" : "A rest element cannot contain a binding pattern.",
+  "_0_is_referenced_directly_or_indirectly_in_its_own_type_annotation_2502" : "'{0}' is referenced directly or indirectly in its own type annotation.",
+  "Cannot_find_namespace_0_2503" : "Cannot find namespace '{0}'.",
+  "Type_0_must_have_a_Symbol_asyncIterator_method_that_returns_an_async_iterator_2504" : "Type '{0}' must have a '[Symbol.asyncIterator]()' method that returns an async iterator.",
+  "A_generator_cannot_have_a_void_type_annotation_2505" : "A generator cannot have a 'void' type annotation.",
+  "_0_is_referenced_directly_or_indirectly_in_its_own_base_expression_2506" : "'{0}' is referenced directly or indirectly in its own base expression.",
+  "Type_0_is_not_a_constructor_function_type_2507" : "Type '{0}' is not a constructor function type.",
+  "No_base_constructor_has_the_specified_number_of_type_arguments_2508" : "No base constructor has the specified number of type arguments.",
+  "Base_constructor_return_type_0_is_not_a_class_or_interface_type_2509" : "Base constructor return type '{0}' is not a class or interface type.",
+  "Base_constructors_must_all_have_the_same_return_type_2510" : "Base constructors must all have the same return type.",
+  "Cannot_create_an_instance_of_an_abstract_class_2511" : "Cannot create an instance of an abstract class.",
+  "Overload_signatures_must_all_be_abstract_or_non_abstract_2512" : "Overload signatures must all be abstract or non-abstract.",
+  "Abstract_method_0_in_class_1_cannot_be_accessed_via_super_expression_2513" : "Abstract method '{0}' in class '{1}' cannot be accessed via super expression.",
+  "Classes_containing_abstract_methods_must_be_marked_abstract_2514" : "Classes containing abstract methods must be marked abstract.",
+  "Non_abstract_class_0_does_not_implement_inherited_abstract_member_1_from_class_2_2515" : "Non-abstract class '{0}' does not implement inherited abstract member '{1}' from class '{2}'.",
+  "All_declarations_of_an_abstract_method_must_be_consecutive_2516" : "All declarations of an abstract method must be consecutive.",
+  "Cannot_assign_an_abstract_constructor_type_to_a_non_abstract_constructor_type_2517" : "Cannot assign an abstract constructor type to a non-abstract constructor type.",
+  "A_this_based_type_guard_is_not_compatible_with_a_parameter_based_type_guard_2518" : "A 'this'-based type guard is not compatible with a parameter-based type guard.",
+  "An_async_iterator_must_have_a_next_method_2519" : "An async iterator must have a 'next()' method.",
+  "Duplicate_identifier_0_Compiler_uses_declaration_1_to_support_async_functions_2520" : "Duplicate identifier '{0}'. Compiler uses declaration '{1}' to support async functions.",
+  "Expression_resolves_to_variable_declaration_0_that_compiler_uses_to_support_async_functions_2521" : "Expression resolves to variable declaration '{0}' that compiler uses to support async functions.",
+  "The_arguments_object_cannot_be_referenced_in_an_async_function_or_method_in_ES3_and_ES5_Consider_usi_2522" : "The 'arguments' object cannot be referenced in an async function or method in ES3 and ES5. Consider using a standard function or method.",
+  "yield_expressions_cannot_be_used_in_a_parameter_initializer_2523" : "'yield' expressions cannot be used in a parameter initializer.",
+  "await_expressions_cannot_be_used_in_a_parameter_initializer_2524" : "'await' expressions cannot be used in a parameter initializer.",
+  "Initializer_provides_no_value_for_this_binding_element_and_the_binding_element_has_no_default_value_2525" : "Initializer provides no value for this binding element and the binding element has no default value.",
+  "A_this_type_is_available_only_in_a_non_static_member_of_a_class_or_interface_2526" : "A 'this' type is available only in a non-static member of a class or interface.",
+  "The_inferred_type_of_0_references_an_inaccessible_1_type_A_type_annotation_is_necessary_2527" : "The inferred type of '{0}' references an inaccessible '{1}' type. A type annotation is necessary.",
+  "A_module_cannot_have_multiple_default_exports_2528" : "A module cannot have multiple default exports.",
+  "Duplicate_identifier_0_Compiler_reserves_name_1_in_top_level_scope_of_a_module_containing_async_func_2529" : "Duplicate identifier '{0}'. Compiler reserves name '{1}' in top level scope of a module containing async functions.",
+  "Property_0_is_incompatible_with_index_signature_2530" : "Property '{0}' is incompatible with index signature.",
+  "Object_is_possibly_null_2531" : "Object is possibly 'null'.",
+  "Object_is_possibly_undefined_2532" : "Object is possibly 'undefined'.",
+  "Object_is_possibly_null_or_undefined_2533" : "Object is possibly 'null' or 'undefined'.",
+  "A_function_returning_never_cannot_have_a_reachable_end_point_2534" : "A function returning 'never' cannot have a reachable end point.",
+  "Enum_type_0_has_members_with_initializers_that_are_not_literals_2535" : "Enum type '{0}' has members with initializers that are not literals.",
+  "Type_0_cannot_be_used_to_index_type_1_2536" : "Type '{0}' cannot be used to index type '{1}'.",
+  "Type_0_has_no_matching_index_signature_for_type_1_2537" : "Type '{0}' has no matching index signature for type '{1}'.",
+  "Type_0_cannot_be_used_as_an_index_type_2538" : "Type '{0}' cannot be used as an index type.",
+  "Cannot_assign_to_0_because_it_is_not_a_variable_2539" : "Cannot assign to '{0}' because it is not a variable.",
+  "Cannot_assign_to_0_because_it_is_a_constant_or_a_read_only_property_2540" : "Cannot assign to '{0}' because it is a constant or a read-only property.",
+  "The_target_of_an_assignment_must_be_a_variable_or_a_property_access_2541" : "The target of an assignment must be a variable or a property access.",
+  "Index_signature_in_type_0_only_permits_reading_2542" : "Index signature in type '{0}' only permits reading.",
+  "Duplicate_identifier_newTarget_Compiler_uses_variable_declaration_newTarget_to_capture_new_target_me_2543" : "Duplicate identifier '_newTarget'. Compiler uses variable declaration '_newTarget' to capture 'new.target' meta-property reference.",
+  "Expression_resolves_to_variable_declaration_newTarget_that_compiler_uses_to_capture_new_target_meta__2544" : "Expression resolves to variable declaration '_newTarget' that compiler uses to capture 'new.target' meta-property reference.",
+  "A_mixin_class_must_have_a_constructor_with_a_single_rest_parameter_of_type_any_2545" : "A mixin class must have a constructor with a single rest parameter of type 'any[]'.",
+  "Property_0_has_conflicting_declarations_and_is_inaccessible_in_type_1_2546" : "Property '{0}' has conflicting declarations and is inaccessible in type '{1}'.",
+  "The_type_returned_by_the_next_method_of_an_async_iterator_must_be_a_promise_for_a_type_with_a_value__2547" : "The type returned by the 'next()' method of an async iterator must be a promise for a type with a 'value' property.",
+  "Type_0_is_not_an_array_type_or_does_not_have_a_Symbol_iterator_method_that_returns_an_iterator_2548" : "Type '{0}' is not an array type or does not have a '[Symbol.iterator]()' method that returns an iterator.",
+  "Type_0_is_not_an_array_type_or_a_string_type_or_does_not_have_a_Symbol_iterator_method_that_returns__2549" : "Type '{0}' is not an array type or a string type or does not have a '[Symbol.iterator]()' method that returns an iterator.",
+  "Generic_type_instantiation_is_excessively_deep_and_possibly_infinite_2550" : "Generic type instantiation is excessively deep and possibly infinite.",
+  "Property_0_does_not_exist_on_type_1_Did_you_mean_2_2551" : "Property '{0}' does not exist on type '{1}'. Did you mean '{2}'?",
+  "Cannot_find_name_0_Did_you_mean_1_2552" : "Cannot find name '{0}'. Did you mean '{1}'?",
+  "Computed_values_are_not_permitted_in_an_enum_with_string_valued_members_2553" : "Computed values are not permitted in an enum with string valued members.",
+  "Expected_0_arguments_but_got_1_2554" : "Expected {0} arguments, but got {1}.",
+  "Expected_at_least_0_arguments_but_got_1_2555" : "Expected at least {0} arguments, but got {1}.",
+  "Expected_0_arguments_but_got_1_or_more_2556" : "Expected {0} arguments, but got {1} or more.",
+  "Expected_at_least_0_arguments_but_got_1_or_more_2557" : "Expected at least {0} arguments, but got {1} or more.",
+  "Expected_0_type_arguments_but_got_1_2558" : "Expected {0} type arguments, but got {1}.",
+  "Type_0_has_no_properties_in_common_with_type_1_2559" : "Type '{0}' has no properties in common with type '{1}'.",
+  "Value_of_type_0_has_no_properties_in_common_with_type_1_Did_you_mean_to_call_it_2560" : "Value of type '{0}' has no properties in common with type '{1}'. Did you mean to call it?",
+  "Object_literal_may_only_specify_known_properties_but_0_does_not_exist_in_type_1_Did_you_mean_to_writ_2561" : "Object literal may only specify known properties, but '{0}' does not exist in type '{1}'. Did you mean to write '{2}'?",
+  "Base_class_expressions_cannot_reference_class_type_parameters_2562" : "Base class expressions cannot reference class type parameters.",
+  "The_containing_function_or_module_body_is_too_large_for_control_flow_analysis_2563" : "The containing function or module body is too large for control flow analysis.",
+  "Property_0_has_no_initializer_and_is_not_definitely_assigned_in_the_constructor_2564" : "Property '{0}' has no initializer and is not definitely assigned in the constructor.",
+  "Property_0_is_used_before_being_assigned_2565" : "Property '{0}' is used before being assigned.",
+  "A_rest_element_cannot_have_a_property_name_2566" : "A rest element cannot have a property name.",
+  "Enum_declarations_can_only_merge_with_namespace_or_other_enum_declarations_2567" : "Enum declarations can only merge with namespace or other enum declarations.",
+  "Type_0_is_not_an_array_type_Use_compiler_option_downlevelIteration_to_allow_iterating_of_iterators_2568" : "Type '{0}' is not an array type. Use compiler option '--downlevelIteration' to allow iterating of iterators.",
+  "Type_0_is_not_an_array_type_or_a_string_type_Use_compiler_option_downlevelIteration_to_allow_iterati_2569" : "Type '{0}' is not an array type or a string type. Use compiler option '--downlevelIteration' to allow iterating of iterators.",
+  "Property_0_does_not_exist_on_type_1_Did_you_forget_to_use_await_2570" : "Property '{0}' does not exist on type '{1}'. Did you forget to use 'await'?",
+  "Object_is_of_type_unknown_2571" : "Object is of type 'unknown'.",
+  "JSX_element_attributes_type_0_may_not_be_a_union_type_2600" : "JSX element attributes type '{0}' may not be a union type.",
+  "The_return_type_of_a_JSX_element_constructor_must_return_an_object_type_2601" : "The return type of a JSX element constructor must return an object type.",
+  "JSX_element_implicitly_has_type_any_because_the_global_type_JSX_Element_does_not_exist_2602" : "JSX element implicitly has type 'any' because the global type 'JSX.Element' does not exist.",
+  "Property_0_in_type_1_is_not_assignable_to_type_2_2603" : "Property '{0}' in type '{1}' is not assignable to type '{2}'.",
+  "JSX_element_type_0_does_not_have_any_construct_or_call_signatures_2604" : "JSX element type '{0}' does not have any construct or call signatures.",
+  "JSX_element_type_0_is_not_a_constructor_function_for_JSX_elements_2605" : "JSX element type '{0}' is not a constructor function for JSX elements.",
+  "Property_0_of_JSX_spread_attribute_is_not_assignable_to_target_property_2606" : "Property '{0}' of JSX spread attribute is not assignable to target property.",
+  "JSX_element_class_does_not_support_attributes_because_it_does_not_have_a_0_property_2607" : "JSX element class does not support attributes because it does not have a '{0}' property.",
+  "The_global_type_JSX_0_may_not_have_more_than_one_property_2608" : "The global type 'JSX.{0}' may not have more than one property.",
+  "JSX_spread_child_must_be_an_array_type_2609" : "JSX spread child must be an array type.",
+  "Cannot_augment_module_0_with_value_exports_because_it_resolves_to_a_non_module_entity_2649" : "Cannot augment module '{0}' with value exports because it resolves to a non-module entity.",
+  "A_member_initializer_in_a_enum_declaration_cannot_reference_members_declared_after_it_including_memb_2651" : "A member initializer in a enum declaration cannot reference members declared after it, including members defined in other enums.",
+  "Merged_declaration_0_cannot_include_a_default_export_declaration_Consider_adding_a_separate_export_d_2652" : "Merged declaration '{0}' cannot include a default export declaration. Consider adding a separate 'export default {0}' declaration instead.",
+  "Non_abstract_class_expression_does_not_implement_inherited_abstract_member_0_from_class_1_2653" : "Non-abstract class expression does not implement inherited abstract member '{0}' from class '{1}'.",
+  "Exported_external_package_typings_file_cannot_contain_tripleslash_references_Please_contact_the_pack_2654" : "Exported external package typings file cannot contain tripleslash references. Please contact the package author to update the package definition.",
+  "Exported_external_package_typings_file_0_is_not_a_module_Please_contact_the_package_author_to_update_2656" : "Exported external package typings file '{0}' is not a module. Please contact the package author to update the package definition.",
+  "JSX_expressions_must_have_one_parent_element_2657" : "JSX expressions must have one parent element.",
+  "Type_0_provides_no_match_for_the_signature_1_2658" : "Type '{0}' provides no match for the signature '{1}'.",
+  "super_is_only_allowed_in_members_of_object_literal_expressions_when_option_target_is_ES2015_or_highe_2659" : "'super' is only allowed in members of object literal expressions when option 'target' is 'ES2015' or higher.",
+  "super_can_only_be_referenced_in_members_of_derived_classes_or_object_literal_expressions_2660" : "'super' can only be referenced in members of derived classes or object literal expressions.",
+  "Cannot_export_0_Only_local_declarations_can_be_exported_from_a_module_2661" : "Cannot export '{0}'. Only local declarations can be exported from a module.",
+  "Cannot_find_name_0_Did_you_mean_the_static_member_1_0_2662" : "Cannot find name '{0}'. Did you mean the static member '{1}.{0}'?",
+  "Cannot_find_name_0_Did_you_mean_the_instance_member_this_0_2663" : "Cannot find name '{0}'. Did you mean the instance member 'this.{0}'?",
+  "Invalid_module_name_in_augmentation_module_0_cannot_be_found_2664" : "Invalid module name in augmentation, module '{0}' cannot be found.",
+  "Invalid_module_name_in_augmentation_Module_0_resolves_to_an_untyped_module_at_1_which_cannot_be_augm_2665" : "Invalid module name in augmentation. Module '{0}' resolves to an untyped module at '{1}', which cannot be augmented.",
+  "Exports_and_export_assignments_are_not_permitted_in_module_augmentations_2666" : "Exports and export assignments are not permitted in module augmentations.",
+  "Imports_are_not_permitted_in_module_augmentations_Consider_moving_them_to_the_enclosing_external_mod_2667" : "Imports are not permitted in module augmentations. Consider moving them to the enclosing external module.",
+  "export_modifier_cannot_be_applied_to_ambient_modules_and_module_augmentations_since_they_are_always__2668" : "'export' modifier cannot be applied to ambient modules and module augmentations since they are always visible.",
+  "Augmentations_for_the_global_scope_can_only_be_directly_nested_in_external_modules_or_ambient_module_2669" : "Augmentations for the global scope can only be directly nested in external modules or ambient module declarations.",
+  "Augmentations_for_the_global_scope_should_have_declare_modifier_unless_they_appear_in_already_ambien_2670" : "Augmentations for the global scope should have 'declare' modifier unless they appear in already ambient context.",
+  "Cannot_augment_module_0_because_it_resolves_to_a_non_module_entity_2671" : "Cannot augment module '{0}' because it resolves to a non-module entity.",
+  "Cannot_assign_a_0_constructor_type_to_a_1_constructor_type_2672" : "Cannot assign a '{0}' constructor type to a '{1}' constructor type.",
+  "Constructor_of_class_0_is_private_and_only_accessible_within_the_class_declaration_2673" : "Constructor of class '{0}' is private and only accessible within the class declaration.",
+  "Constructor_of_class_0_is_protected_and_only_accessible_within_the_class_declaration_2674" : "Constructor of class '{0}' is protected and only accessible within the class declaration.",
+  "Cannot_extend_a_class_0_Class_constructor_is_marked_as_private_2675" : "Cannot extend a class '{0}'. Class constructor is marked as private.",
+  "Accessors_must_both_be_abstract_or_non_abstract_2676" : "Accessors must both be abstract or non-abstract.",
+  "A_type_predicate_s_type_must_be_assignable_to_its_parameter_s_type_2677" : "A type predicate's type must be assignable to its parameter's type.",
+  "Type_0_is_not_comparable_to_type_1_2678" : "Type '{0}' is not comparable to type '{1}'.",
+  "A_function_that_is_called_with_the_new_keyword_cannot_have_a_this_type_that_is_void_2679" : "A function that is called with the 'new' keyword cannot have a 'this' type that is 'void'.",
+  "A_0_parameter_must_be_the_first_parameter_2680" : "A '{0}' parameter must be the first parameter.",
+  "A_constructor_cannot_have_a_this_parameter_2681" : "A constructor cannot have a 'this' parameter.",
+  "get_and_set_accessor_must_have_the_same_this_type_2682" : "'get' and 'set' accessor must have the same 'this' type.",
+  "this_implicitly_has_type_any_because_it_does_not_have_a_type_annotation_2683" : "'this' implicitly has type 'any' because it does not have a type annotation.",
+  "The_this_context_of_type_0_is_not_assignable_to_method_s_this_of_type_1_2684" : "The 'this' context of type '{0}' is not assignable to method's 'this' of type '{1}'.",
+  "The_this_types_of_each_signature_are_incompatible_2685" : "The 'this' types of each signature are incompatible.",
+  "_0_refers_to_a_UMD_global_but_the_current_file_is_a_module_Consider_adding_an_import_instead_2686" : "'{0}' refers to a UMD global, but the current file is a module. Consider adding an import instead.",
+  "All_declarations_of_0_must_have_identical_modifiers_2687" : "All declarations of '{0}' must have identical modifiers.",
+  "Cannot_find_type_definition_file_for_0_2688" : "Cannot find type definition file for '{0}'.",
+  "Cannot_extend_an_interface_0_Did_you_mean_implements_2689" : "Cannot extend an interface '{0}'. Did you mean 'implements'?",
+  "An_import_path_cannot_end_with_a_0_extension_Consider_importing_1_instead_2691" : "An import path cannot end with a '{0}' extension. Consider importing '{1}' instead.",
+  "_0_is_a_primitive_but_1_is_a_wrapper_object_Prefer_using_0_when_possible_2692" : "'{0}' is a primitive, but '{1}' is a wrapper object. Prefer using '{0}' when possible.",
+  "_0_only_refers_to_a_type_but_is_being_used_as_a_value_here_2693" : "'{0}' only refers to a type, but is being used as a value here.",
+  "Namespace_0_has_no_exported_member_1_2694" : "Namespace '{0}' has no exported member '{1}'.",
+  "Left_side_of_comma_operator_is_unused_and_has_no_side_effects_2695" : "Left side of comma operator is unused and has no side effects.",
+  "The_Object_type_is_assignable_to_very_few_other_types_Did_you_mean_to_use_the_any_type_instead_2696" : "The 'Object' type is assignable to very few other types. Did you mean to use the 'any' type instead?",
+  "An_async_function_or_method_must_return_a_Promise_Make_sure_you_have_a_declaration_for_Promise_or_in_2697" : "An async function or method must return a 'Promise'. Make sure you have a declaration for 'Promise' or include 'ES2015' in your `--lib` option.",
+  "Spread_types_may_only_be_created_from_object_types_2698" : "Spread types may only be created from object types.",
+  "Static_property_0_conflicts_with_built_in_property_Function_0_of_constructor_function_1_2699" : "Static property '{0}' conflicts with built-in property 'Function.{0}' of constructor function '{1}'.",
+  "Rest_types_may_only_be_created_from_object_types_2700" : "Rest types may only be created from object types.",
+  "The_target_of_an_object_rest_assignment_must_be_a_variable_or_a_property_access_2701" : "The target of an object rest assignment must be a variable or a property access.",
+  "_0_only_refers_to_a_type_but_is_being_used_as_a_namespace_here_2702" : "'{0}' only refers to a type, but is being used as a namespace here.",
+  "The_operand_of_a_delete_operator_must_be_a_property_reference_2703" : "The operand of a delete operator must be a property reference.",
+  "The_operand_of_a_delete_operator_cannot_be_a_read_only_property_2704" : "The operand of a delete operator cannot be a read-only property.",
+  "An_async_function_or_method_in_ES5_SlashES3_requires_the_Promise_constructor_Make_sure_you_have_a_de_2705" : "An async function or method in ES5/ES3 requires the 'Promise' constructor.  Make sure you have a declaration for the 'Promise' constructor or include 'ES2015' in your `--lib` option.",
+  "Required_type_parameters_may_not_follow_optional_type_parameters_2706" : "Required type parameters may not follow optional type parameters.",
+  "Generic_type_0_requires_between_1_and_2_type_arguments_2707" : "Generic type '{0}' requires between {1} and {2} type arguments.",
+  "Cannot_use_namespace_0_as_a_value_2708" : "Cannot use namespace '{0}' as a value.",
+  "Cannot_use_namespace_0_as_a_type_2709" : "Cannot use namespace '{0}' as a type.",
+  "_0_are_specified_twice_The_attribute_named_0_will_be_overwritten_2710" : "'{0}' are specified twice. The attribute named '{0}' will be overwritten.",
+  "A_dynamic_import_call_returns_a_Promise_Make_sure_you_have_a_declaration_for_Promise_or_include_ES20_2711" : "A dynamic import call returns a 'Promise'. Make sure you have a declaration for 'Promise' or include 'ES2015' in your `--lib` option.",
+  "A_dynamic_import_call_in_ES5_SlashES3_requires_the_Promise_constructor_Make_sure_you_have_a_declarat_2712" : "A dynamic import call in ES5/ES3 requires the 'Promise' constructor.  Make sure you have a declaration for the 'Promise' constructor or include 'ES2015' in your `--lib` option.",
+  "Cannot_access_0_1_because_0_is_a_type_but_not_a_namespace_Did_you_mean_to_retrieve_the_type_of_the_p_2713" : "Cannot access '{0}.{1}' because '{0}' is a type, but not a namespace. Did you mean to retrieve the type of the property '{1}' in '{0}' with '{0}[\"{1}\"]'?",
+  "The_expression_of_an_export_assignment_must_be_an_identifier_or_qualified_name_in_an_ambient_context_2714" : "The expression of an export assignment must be an identifier or qualified name in an ambient context.",
+  "Abstract_property_0_in_class_1_cannot_be_accessed_in_the_constructor_2715" : "Abstract property '{0}' in class '{1}' cannot be accessed in the constructor.",
+  "Type_parameter_0_has_a_circular_default_2716" : "Type parameter '{0}' has a circular default.",
+  "Subsequent_property_declarations_must_have_the_same_type_Property_0_must_be_of_type_1_but_here_has_t_2717" : "Subsequent property declarations must have the same type.  Property '{0}' must be of type '{1}', but here has type '{2}'.",
+  "Duplicate_declaration_0_2718" : "Duplicate declaration '{0}'.",
+  "Type_0_is_not_assignable_to_type_1_Two_different_types_with_this_name_exist_but_they_are_unrelated_2719" : "Type '{0}' is not assignable to type '{1}'. Two different types with this name exist, but they are unrelated.",
+  "Class_0_incorrectly_implements_class_1_Did_you_mean_to_extend_1_and_inherit_its_members_as_a_subclas_2720" : "Class '{0}' incorrectly implements class '{1}'. Did you mean to extend '{1}' and inherit its members as a subclass?",
+  "Cannot_invoke_an_object_which_is_possibly_null_2721" : "Cannot invoke an object which is possibly 'null'.",
+  "Cannot_invoke_an_object_which_is_possibly_undefined_2722" : "Cannot invoke an object which is possibly 'undefined'.",
+  "Cannot_invoke_an_object_which_is_possibly_null_or_undefined_2723" : "Cannot invoke an object which is possibly 'null' or 'undefined'.",
+  "Module_0_has_no_exported_member_1_Did_you_mean_2_2724" : "Module '{0}' has no exported member '{1}'. Did you mean '{2}'?",
+  "Class_name_cannot_be_Object_when_targeting_ES5_with_module_0_2725" : "Class name cannot be 'Object' when targeting ES5 with module {0}.",
+  "Cannot_find_lib_definition_for_0_2726" : "Cannot find lib definition for '{0}'.",
+  "Cannot_find_lib_definition_for_0_Did_you_mean_1_2727" : "Cannot find lib definition for '{0}'. Did you mean '{1}'?",
+  "Import_declaration_0_is_using_private_name_1_4000" : "Import declaration '{0}' is using private name '{1}'.",
+  "Type_parameter_0_of_exported_class_has_or_is_using_private_name_1_4002" : "Type parameter '{0}' of exported class has or is using private name '{1}'.",
+  "Type_parameter_0_of_exported_interface_has_or_is_using_private_name_1_4004" : "Type parameter '{0}' of exported interface has or is using private name '{1}'.",
+  "Type_parameter_0_of_constructor_signature_from_exported_interface_has_or_is_using_private_name_1_4006" : "Type parameter '{0}' of constructor signature from exported interface has or is using private name '{1}'.",
+  "Type_parameter_0_of_call_signature_from_exported_interface_has_or_is_using_private_name_1_4008" : "Type parameter '{0}' of call signature from exported interface has or is using private name '{1}'.",
+  "Type_parameter_0_of_public_static_method_from_exported_class_has_or_is_using_private_name_1_4010" : "Type parameter '{0}' of public static method from exported class has or is using private name '{1}'.",
+  "Type_parameter_0_of_public_method_from_exported_class_has_or_is_using_private_name_1_4012" : "Type parameter '{0}' of public method from exported class has or is using private name '{1}'.",
+  "Type_parameter_0_of_method_from_exported_interface_has_or_is_using_private_name_1_4014" : "Type parameter '{0}' of method from exported interface has or is using private name '{1}'.",
+  "Type_parameter_0_of_exported_function_has_or_is_using_private_name_1_4016" : "Type parameter '{0}' of exported function has or is using private name '{1}'.",
+  "Implements_clause_of_exported_class_0_has_or_is_using_private_name_1_4019" : "Implements clause of exported class '{0}' has or is using private name '{1}'.",
+  "extends_clause_of_exported_class_0_has_or_is_using_private_name_1_4020" : "'extends' clause of exported class '{0}' has or is using private name '{1}'.",
+  "extends_clause_of_exported_interface_0_has_or_is_using_private_name_1_4022" : "'extends' clause of exported interface '{0}' has or is using private name '{1}'.",
+  "Exported_variable_0_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named_4023" : "Exported variable '{0}' has or is using name '{1}' from external module {2} but cannot be named.",
+  "Exported_variable_0_has_or_is_using_name_1_from_private_module_2_4024" : "Exported variable '{0}' has or is using name '{1}' from private module '{2}'.",
+  "Exported_variable_0_has_or_is_using_private_name_1_4025" : "Exported variable '{0}' has or is using private name '{1}'.",
+  "Public_static_property_0_of_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot__4026" : "Public static property '{0}' of exported class has or is using name '{1}' from external module {2} but cannot be named.",
+  "Public_static_property_0_of_exported_class_has_or_is_using_name_1_from_private_module_2_4027" : "Public static property '{0}' of exported class has or is using name '{1}' from private module '{2}'.",
+  "Public_static_property_0_of_exported_class_has_or_is_using_private_name_1_4028" : "Public static property '{0}' of exported class has or is using private name '{1}'.",
+  "Public_property_0_of_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_name_4029" : "Public property '{0}' of exported class has or is using name '{1}' from external module {2} but cannot be named.",
+  "Public_property_0_of_exported_class_has_or_is_using_name_1_from_private_module_2_4030" : "Public property '{0}' of exported class has or is using name '{1}' from private module '{2}'.",
+  "Public_property_0_of_exported_class_has_or_is_using_private_name_1_4031" : "Public property '{0}' of exported class has or is using private name '{1}'.",
+  "Property_0_of_exported_interface_has_or_is_using_name_1_from_private_module_2_4032" : "Property '{0}' of exported interface has or is using name '{1}' from private module '{2}'.",
+  "Property_0_of_exported_interface_has_or_is_using_private_name_1_4033" : "Property '{0}' of exported interface has or is using private name '{1}'.",
+  "Parameter_type_of_public_static_setter_0_from_exported_class_has_or_is_using_name_1_from_private_mod_4034" : "Parameter type of public static setter '{0}' from exported class has or is using name '{1}' from private module '{2}'.",
+  "Parameter_type_of_public_static_setter_0_from_exported_class_has_or_is_using_private_name_1_4035" : "Parameter type of public static setter '{0}' from exported class has or is using private name '{1}'.",
+  "Parameter_type_of_public_setter_0_from_exported_class_has_or_is_using_name_1_from_private_module_2_4036" : "Parameter type of public setter '{0}' from exported class has or is using name '{1}' from private module '{2}'.",
+  "Parameter_type_of_public_setter_0_from_exported_class_has_or_is_using_private_name_1_4037" : "Parameter type of public setter '{0}' from exported class has or is using private name '{1}'.",
+  "Return_type_of_public_static_getter_0_from_exported_class_has_or_is_using_name_1_from_external_modul_4038" : "Return type of public static getter '{0}' from exported class has or is using name '{1}' from external module {2} but cannot be named.",
+  "Return_type_of_public_static_getter_0_from_exported_class_has_or_is_using_name_1_from_private_module_4039" : "Return type of public static getter '{0}' from exported class has or is using name '{1}' from private module '{2}'.",
+  "Return_type_of_public_static_getter_0_from_exported_class_has_or_is_using_private_name_1_4040" : "Return type of public static getter '{0}' from exported class has or is using private name '{1}'.",
+  "Return_type_of_public_getter_0_from_exported_class_has_or_is_using_name_1_from_external_module_2_but_4041" : "Return type of public getter '{0}' from exported class has or is using name '{1}' from external module {2} but cannot be named.",
+  "Return_type_of_public_getter_0_from_exported_class_has_or_is_using_name_1_from_private_module_2_4042" : "Return type of public getter '{0}' from exported class has or is using name '{1}' from private module '{2}'.",
+  "Return_type_of_public_getter_0_from_exported_class_has_or_is_using_private_name_1_4043" : "Return type of public getter '{0}' from exported class has or is using private name '{1}'.",
+  "Return_type_of_constructor_signature_from_exported_interface_has_or_is_using_name_0_from_private_mod_4044" : "Return type of constructor signature from exported interface has or is using name '{0}' from private module '{1}'.",
+  "Return_type_of_constructor_signature_from_exported_interface_has_or_is_using_private_name_0_4045" : "Return type of constructor signature from exported interface has or is using private name '{0}'.",
+  "Return_type_of_call_signature_from_exported_interface_has_or_is_using_name_0_from_private_module_1_4046" : "Return type of call signature from exported interface has or is using name '{0}' from private module '{1}'.",
+  "Return_type_of_call_signature_from_exported_interface_has_or_is_using_private_name_0_4047" : "Return type of call signature from exported interface has or is using private name '{0}'.",
+  "Return_type_of_index_signature_from_exported_interface_has_or_is_using_name_0_from_private_module_1_4048" : "Return type of index signature from exported interface has or is using name '{0}' from private module '{1}'.",
+  "Return_type_of_index_signature_from_exported_interface_has_or_is_using_private_name_0_4049" : "Return type of index signature from exported interface has or is using private name '{0}'.",
+  "Return_type_of_public_static_method_from_exported_class_has_or_is_using_name_0_from_external_module__4050" : "Return type of public static method from exported class has or is using name '{0}' from external module {1} but cannot be named.",
+  "Return_type_of_public_static_method_from_exported_class_has_or_is_using_name_0_from_private_module_1_4051" : "Return type of public static method from exported class has or is using name '{0}' from private module '{1}'.",
+  "Return_type_of_public_static_method_from_exported_class_has_or_is_using_private_name_0_4052" : "Return type of public static method from exported class has or is using private name '{0}'.",
+  "Return_type_of_public_method_from_exported_class_has_or_is_using_name_0_from_external_module_1_but_c_4053" : "Return type of public method from exported class has or is using name '{0}' from external module {1} but cannot be named.",
+  "Return_type_of_public_method_from_exported_class_has_or_is_using_name_0_from_private_module_1_4054" : "Return type of public method from exported class has or is using name '{0}' from private module '{1}'.",
+  "Return_type_of_public_method_from_exported_class_has_or_is_using_private_name_0_4055" : "Return type of public method from exported class has or is using private name '{0}'.",
+  "Return_type_of_method_from_exported_interface_has_or_is_using_name_0_from_private_module_1_4056" : "Return type of method from exported interface has or is using name '{0}' from private module '{1}'.",
+  "Return_type_of_method_from_exported_interface_has_or_is_using_private_name_0_4057" : "Return type of method from exported interface has or is using private name '{0}'.",
+  "Return_type_of_exported_function_has_or_is_using_name_0_from_external_module_1_but_cannot_be_named_4058" : "Return type of exported function has or is using name '{0}' from external module {1} but cannot be named.",
+  "Return_type_of_exported_function_has_or_is_using_name_0_from_private_module_1_4059" : "Return type of exported function has or is using name '{0}' from private module '{1}'.",
+  "Return_type_of_exported_function_has_or_is_using_private_name_0_4060" : "Return type of exported function has or is using private name '{0}'.",
+  "Parameter_0_of_constructor_from_exported_class_has_or_is_using_name_1_from_external_module_2_but_can_4061" : "Parameter '{0}' of constructor from exported class has or is using name '{1}' from external module {2} but cannot be named.",
+  "Parameter_0_of_constructor_from_exported_class_has_or_is_using_name_1_from_private_module_2_4062" : "Parameter '{0}' of constructor from exported class has or is using name '{1}' from private module '{2}'.",
+  "Parameter_0_of_constructor_from_exported_class_has_or_is_using_private_name_1_4063" : "Parameter '{0}' of constructor from exported class has or is using private name '{1}'.",
+  "Parameter_0_of_constructor_signature_from_exported_interface_has_or_is_using_name_1_from_private_mod_4064" : "Parameter '{0}' of constructor signature from exported interface has or is using name '{1}' from private module '{2}'.",
+  "Parameter_0_of_constructor_signature_from_exported_interface_has_or_is_using_private_name_1_4065" : "Parameter '{0}' of constructor signature from exported interface has or is using private name '{1}'.",
+  "Parameter_0_of_call_signature_from_exported_interface_has_or_is_using_name_1_from_private_module_2_4066" : "Parameter '{0}' of call signature from exported interface has or is using name '{1}' from private module '{2}'.",
+  "Parameter_0_of_call_signature_from_exported_interface_has_or_is_using_private_name_1_4067" : "Parameter '{0}' of call signature from exported interface has or is using private name '{1}'.",
+  "Parameter_0_of_public_static_method_from_exported_class_has_or_is_using_name_1_from_external_module__4068" : "Parameter '{0}' of public static method from exported class has or is using name '{1}' from external module {2} but cannot be named.",
+  "Parameter_0_of_public_static_method_from_exported_class_has_or_is_using_name_1_from_private_module_2_4069" : "Parameter '{0}' of public static method from exported class has or is using name '{1}' from private module '{2}'.",
+  "Parameter_0_of_public_static_method_from_exported_class_has_or_is_using_private_name_1_4070" : "Parameter '{0}' of public static method from exported class has or is using private name '{1}'.",
+  "Parameter_0_of_public_method_from_exported_class_has_or_is_using_name_1_from_external_module_2_but_c_4071" : "Parameter '{0}' of public method from exported class has or is using name '{1}' from external module {2} but cannot be named.",
+  "Parameter_0_of_public_method_from_exported_class_has_or_is_using_name_1_from_private_module_2_4072" : "Parameter '{0}' of public method from exported class has or is using name '{1}' from private module '{2}'.",
+  "Parameter_0_of_public_method_from_exported_class_has_or_is_using_private_name_1_4073" : "Parameter '{0}' of public method from exported class has or is using private name '{1}'.",
+  "Parameter_0_of_method_from_exported_interface_has_or_is_using_name_1_from_private_module_2_4074" : "Parameter '{0}' of method from exported interface has or is using name '{1}' from private module '{2}'.",
+  "Parameter_0_of_method_from_exported_interface_has_or_is_using_private_name_1_4075" : "Parameter '{0}' of method from exported interface has or is using private name '{1}'.",
+  "Parameter_0_of_exported_function_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named_4076" : "Parameter '{0}' of exported function has or is using name '{1}' from external module {2} but cannot be named.",
+  "Parameter_0_of_exported_function_has_or_is_using_name_1_from_private_module_2_4077" : "Parameter '{0}' of exported function has or is using name '{1}' from private module '{2}'.",
+  "Parameter_0_of_exported_function_has_or_is_using_private_name_1_4078" : "Parameter '{0}' of exported function has or is using private name '{1}'.",
+  "Exported_type_alias_0_has_or_is_using_private_name_1_4081" : "Exported type alias '{0}' has or is using private name '{1}'.",
+  "Default_export_of_the_module_has_or_is_using_private_name_0_4082" : "Default export of the module has or is using private name '{0}'.",
+  "Type_parameter_0_of_exported_type_alias_has_or_is_using_private_name_1_4083" : "Type parameter '{0}' of exported type alias has or is using private name '{1}'.",
+  "Conflicting_definitions_for_0_found_at_1_and_2_Consider_installing_a_specific_version_of_this_librar_4090" : "Conflicting definitions for '{0}' found at '{1}' and '{2}'. Consider installing a specific version of this library to resolve the conflict.",
+  "Parameter_0_of_index_signature_from_exported_interface_has_or_is_using_name_1_from_private_module_2_4091" : "Parameter '{0}' of index signature from exported interface has or is using name '{1}' from private module '{2}'.",
+  "Parameter_0_of_index_signature_from_exported_interface_has_or_is_using_private_name_1_4092" : "Parameter '{0}' of index signature from exported interface has or is using private name '{1}'.",
+  "Property_0_of_exported_class_expression_may_not_be_private_or_protected_4094" : "Property '{0}' of exported class expression may not be private or protected.",
+  "Public_static_method_0_of_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_4095" : "Public static method '{0}' of exported class has or is using name '{1}' from external module {2} but cannot be named.",
+  "Public_static_method_0_of_exported_class_has_or_is_using_name_1_from_private_module_2_4096" : "Public static method '{0}' of exported class has or is using name '{1}' from private module '{2}'.",
+  "Public_static_method_0_of_exported_class_has_or_is_using_private_name_1_4097" : "Public static method '{0}' of exported class has or is using private name '{1}'.",
+  "Public_method_0_of_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named_4098" : "Public method '{0}' of exported class has or is using name '{1}' from external module {2} but cannot be named.",
+  "Public_method_0_of_exported_class_has_or_is_using_name_1_from_private_module_2_4099" : "Public method '{0}' of exported class has or is using name '{1}' from private module '{2}'.",
+  "Public_method_0_of_exported_class_has_or_is_using_private_name_1_4100" : "Public method '{0}' of exported class has or is using private name '{1}'.",
+  "Method_0_of_exported_interface_has_or_is_using_name_1_from_private_module_2_4101" : "Method '{0}' of exported interface has or is using name '{1}' from private module '{2}'.",
+  "Method_0_of_exported_interface_has_or_is_using_private_name_1_4102" : "Method '{0}' of exported interface has or is using private name '{1}'.",
+  "The_current_host_does_not_support_the_0_option_5001" : "The current host does not support the '{0}' option.",
+  "Cannot_find_the_common_subdirectory_path_for_the_input_files_5009" : "Cannot find the common subdirectory path for the input files.",
+  "File_specification_cannot_end_in_a_recursive_directory_wildcard_Asterisk_Asterisk_Colon_0_5010" : "File specification cannot end in a recursive directory wildcard ('**'): '{0}'.",
+  "Cannot_read_file_0_Colon_1_5012" : "Cannot read file '{0}': {1}.",
+  "Failed_to_parse_file_0_Colon_1_5014" : "Failed to parse file '{0}': {1}.",
+  "Unknown_compiler_option_0_5023" : "Unknown compiler option '{0}'.",
+  "Compiler_option_0_requires_a_value_of_type_1_5024" : "Compiler option '{0}' requires a value of type {1}.",
+  "Could_not_write_file_0_Colon_1_5033" : "Could not write file '{0}': {1}.",
+  "Option_project_cannot_be_mixed_with_source_files_on_a_command_line_5042" : "Option 'project' cannot be mixed with source files on a command line.",
+  "Option_isolatedModules_can_only_be_used_when_either_option_module_is_provided_or_option_target_is_ES_5047" : "Option 'isolatedModules' can only be used when either option '--module' is provided or option 'target' is 'ES2015' or higher.",
+  "Option_0_can_only_be_used_when_either_option_inlineSourceMap_or_option_sourceMap_is_provided_5051" : "Option '{0} can only be used when either option '--inlineSourceMap' or option '--sourceMap' is provided.",
+  "Option_0_cannot_be_specified_without_specifying_option_1_5052" : "Option '{0}' cannot be specified without specifying option '{1}'.",
+  "Option_0_cannot_be_specified_with_option_1_5053" : "Option '{0}' cannot be specified with option '{1}'.",
+  "A_tsconfig_json_file_is_already_defined_at_Colon_0_5054" : "A 'tsconfig.json' file is already defined at: '{0}'.",
+  "Cannot_write_file_0_because_it_would_overwrite_input_file_5055" : "Cannot write file '{0}' because it would overwrite input file.",
+  "Cannot_write_file_0_because_it_would_be_overwritten_by_multiple_input_files_5056" : "Cannot write file '{0}' because it would be overwritten by multiple input files.",
+  "Cannot_find_a_tsconfig_json_file_at_the_specified_directory_Colon_0_5057" : "Cannot find a tsconfig.json file at the specified directory: '{0}'.",
+  "The_specified_path_does_not_exist_Colon_0_5058" : "The specified path does not exist: '{0}'.",
+  "Invalid_value_for_reactNamespace_0_is_not_a_valid_identifier_5059" : "Invalid value for '--reactNamespace'. '{0}' is not a valid identifier.",
+  "Option_paths_cannot_be_used_without_specifying_baseUrl_option_5060" : "Option 'paths' cannot be used without specifying '--baseUrl' option.",
+  "Pattern_0_can_have_at_most_one_Asterisk_character_5061" : "Pattern '{0}' can have at most one '*' character.",
+  "Substitution_0_in_pattern_1_in_can_have_at_most_one_Asterisk_character_5062" : "Substitution '{0}' in pattern '{1}' in can have at most one '*' character.",
+  "Substitutions_for_pattern_0_should_be_an_array_5063" : "Substitutions for pattern '{0}' should be an array.",
+  "Substitution_0_for_pattern_1_has_incorrect_type_expected_string_got_2_5064" : "Substitution '{0}' for pattern '{1}' has incorrect type, expected 'string', got '{2}'.",
+  "File_specification_cannot_contain_a_parent_directory_that_appears_after_a_recursive_directory_wildca_5065" : "File specification cannot contain a parent directory ('..') that appears after a recursive directory wildcard ('**'): '{0}'.",
+  "Substitutions_for_pattern_0_shouldn_t_be_an_empty_array_5066" : "Substitutions for pattern '{0}' shouldn't be an empty array.",
+  "Invalid_value_for_jsxFactory_0_is_not_a_valid_identifier_or_qualified_name_5067" : "Invalid value for 'jsxFactory'. '{0}' is not a valid identifier or qualified-name.",
+  "Adding_a_tsconfig_json_file_will_help_organize_projects_that_contain_both_TypeScript_and_JavaScript__5068" : "Adding a tsconfig.json file will help organize projects that contain both TypeScript and JavaScript files. Learn more at https://aka.ms/tsconfig.",
+  "Option_0_cannot_be_specified_without_specifying_option_1_or_option_2_5069" : "Option '{0}' cannot be specified without specifying option '{1}' or option '{2}'.",
+  "Option_resolveJsonModule_cannot_be_specified_without_node_module_resolution_strategy_5070" : "Option '--resolveJsonModule' cannot be specified without 'node' module resolution strategy.",
+  "Generates_a_sourcemap_for_each_corresponding_d_ts_file_6000" : "Generates a sourcemap for each corresponding '.d.ts' file.",
+  "Concatenate_and_emit_output_to_single_file_6001" : "Concatenate and emit output to single file.",
+  "Generates_corresponding_d_ts_file_6002" : "Generates corresponding '.d.ts' file.",
+  "Specify_the_location_where_debugger_should_locate_map_files_instead_of_generated_locations_6003" : "Specify the location where debugger should locate map files instead of generated locations.",
+  "Specify_the_location_where_debugger_should_locate_TypeScript_files_instead_of_source_locations_6004" : "Specify the location where debugger should locate TypeScript files instead of source locations.",
+  "Watch_input_files_6005" : "Watch input files.",
+  "Redirect_output_structure_to_the_directory_6006" : "Redirect output structure to the directory.",
+  "Do_not_erase_const_enum_declarations_in_generated_code_6007" : "Do not erase const enum declarations in generated code.",
+  "Do_not_emit_outputs_if_any_errors_were_reported_6008" : "Do not emit outputs if any errors were reported.",
+  "Do_not_emit_comments_to_output_6009" : "Do not emit comments to output.",
+  "Do_not_emit_outputs_6010" : "Do not emit outputs.",
+  "Allow_default_imports_from_modules_with_no_default_export_This_does_not_affect_code_emit_just_typech_6011" : "Allow default imports from modules with no default export. This does not affect code emit, just typechecking.",
+  "Skip_type_checking_of_declaration_files_6012" : "Skip type checking of declaration files.",
+  "Do_not_resolve_the_real_path_of_symlinks_6013" : "Do not resolve the real path of symlinks.",
+  "Only_emit_d_ts_declaration_files_6014" : "Only emit '.d.ts' declaration files.",
+  "Specify_ECMAScript_target_version_Colon_ES3_default_ES5_ES2015_ES2016_ES2017_ES2018_or_ESNEXT_6015" : "Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017','ES2018' or 'ESNEXT'.",
+  "Specify_module_code_generation_Colon_none_commonjs_amd_system_umd_es2015_or_ESNext_6016" : "Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'.",
+  "Print_this_message_6017" : "Print this message.",
+  "Print_the_compiler_s_version_6019" : "Print the compiler's version.",
+  "Compile_the_project_given_the_path_to_its_configuration_file_or_to_a_folder_with_a_tsconfig_json_6020" : "Compile the project given the path to its configuration file, or to a folder with a 'tsconfig.json'.",
+  "Syntax_Colon_0_6023" : "Syntax: {0}",
+  "options_6024" : "options",
+  "file_6025" : "file",
+  "Examples_Colon_0_6026" : "Examples: {0}",
+  "Options_Colon_6027" : "Options:",
+  "Version_0_6029" : "Version {0}",
+  "Insert_command_line_options_and_files_from_a_file_6030" : "Insert command line options and files from a file.",
+  "Starting_compilation_in_watch_mode_6031" : "Starting compilation in watch mode...",
+  "File_change_detected_Starting_incremental_compilation_6032" : "File change detected. Starting incremental compilation...",
+  "KIND_6034" : "KIND",
+  "FILE_6035" : "FILE",
+  "VERSION_6036" : "VERSION",
+  "LOCATION_6037" : "LOCATION",
+  "DIRECTORY_6038" : "DIRECTORY",
+  "STRATEGY_6039" : "STRATEGY",
+  "FILE_OR_DIRECTORY_6040" : "FILE OR DIRECTORY",
+  "Generates_corresponding_map_file_6043" : "Generates corresponding '.map' file.",
+  "Compiler_option_0_expects_an_argument_6044" : "Compiler option '{0}' expects an argument.",
+  "Unterminated_quoted_string_in_response_file_0_6045" : "Unterminated quoted string in response file '{0}'.",
+  "Argument_for_0_option_must_be_Colon_1_6046" : "Argument for '{0}' option must be: {1}.",
+  "Locale_must_be_of_the_form_language_or_language_territory_For_example_0_or_1_6048" : "Locale must be of the form <language> or <language>-<territory>. For example '{0}' or '{1}'.",
+  "Unsupported_locale_0_6049" : "Unsupported locale '{0}'.",
+  "Unable_to_open_file_0_6050" : "Unable to open file '{0}'.",
+  "Corrupted_locale_file_0_6051" : "Corrupted locale file {0}.",
+  "Raise_error_on_expressions_and_declarations_with_an_implied_any_type_6052" : "Raise error on expressions and declarations with an implied 'any' type.",
+  "File_0_not_found_6053" : "File '{0}' not found.",
+  "File_0_has_unsupported_extension_The_only_supported_extensions_are_1_6054" : "File '{0}' has unsupported extension. The only supported extensions are {1}.",
+  "Suppress_noImplicitAny_errors_for_indexing_objects_lacking_index_signatures_6055" : "Suppress noImplicitAny errors for indexing objects lacking index signatures.",
+  "Do_not_emit_declarations_for_code_that_has_an_internal_annotation_6056" : "Do not emit declarations for code that has an '@internal' annotation.",
+  "Specify_the_root_directory_of_input_files_Use_to_control_the_output_directory_structure_with_outDir_6058" : "Specify the root directory of input files. Use to control the output directory structure with --outDir.",
+  "File_0_is_not_under_rootDir_1_rootDir_is_expected_to_contain_all_source_files_6059" : "File '{0}' is not under 'rootDir' '{1}'. 'rootDir' is expected to contain all source files.",
+  "Specify_the_end_of_line_sequence_to_be_used_when_emitting_files_Colon_CRLF_dos_or_LF_unix_6060" : "Specify the end of line sequence to be used when emitting files: 'CRLF' (dos) or 'LF' (unix).",
+  "NEWLINE_6061" : "NEWLINE",
+  "Option_0_can_only_be_specified_in_tsconfig_json_file_6064" : "Option '{0}' can only be specified in 'tsconfig.json' file.",
+  "Enables_experimental_support_for_ES7_decorators_6065" : "Enables experimental support for ES7 decorators.",
+  "Enables_experimental_support_for_emitting_type_metadata_for_decorators_6066" : "Enables experimental support for emitting type metadata for decorators.",
+  "Enables_experimental_support_for_ES7_async_functions_6068" : "Enables experimental support for ES7 async functions.",
+  "Specify_module_resolution_strategy_Colon_node_Node_js_or_classic_TypeScript_pre_1_6_6069" : "Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6).",
+  "Initializes_a_TypeScript_project_and_creates_a_tsconfig_json_file_6070" : "Initializes a TypeScript project and creates a tsconfig.json file.",
+  "Successfully_created_a_tsconfig_json_file_6071" : "Successfully created a tsconfig.json file.",
+  "Suppress_excess_property_checks_for_object_literals_6072" : "Suppress excess property checks for object literals.",
+  "Stylize_errors_and_messages_using_color_and_context_experimental_6073" : "Stylize errors and messages using color and context (experimental).",
+  "Do_not_report_errors_on_unused_labels_6074" : "Do not report errors on unused labels.",
+  "Report_error_when_not_all_code_paths_in_function_return_a_value_6075" : "Report error when not all code paths in function return a value.",
+  "Report_errors_for_fallthrough_cases_in_switch_statement_6076" : "Report errors for fallthrough cases in switch statement.",
+  "Do_not_report_errors_on_unreachable_code_6077" : "Do not report errors on unreachable code.",
+  "Disallow_inconsistently_cased_references_to_the_same_file_6078" : "Disallow inconsistently-cased references to the same file.",
+  "Specify_library_files_to_be_included_in_the_compilation_6079" : "Specify library files to be included in the compilation.",
+  "Specify_JSX_code_generation_Colon_preserve_react_native_or_react_6080" : "Specify JSX code generation: 'preserve', 'react-native', or 'react'.",
+  "File_0_has_an_unsupported_extension_so_skipping_it_6081" : "File '{0}' has an unsupported extension, so skipping it.",
+  "Only_amd_and_system_modules_are_supported_alongside_0_6082" : "Only 'amd' and 'system' modules are supported alongside --{0}.",
+  "Base_directory_to_resolve_non_absolute_module_names_6083" : "Base directory to resolve non-absolute module names.",
+  "Deprecated_Use_jsxFactory_instead_Specify_the_object_invoked_for_createElement_when_targeting_react__6084" : "[Deprecated] Use '--jsxFactory' instead. Specify the object invoked for createElement when targeting 'react' JSX emit",
+  "Enable_tracing_of_the_name_resolution_process_6085" : "Enable tracing of the name resolution process.",
+  "Resolving_module_0_from_1_6086" : "======== Resolving module '{0}' from '{1}'. ========",
+  "Explicitly_specified_module_resolution_kind_Colon_0_6087" : "Explicitly specified module resolution kind: '{0}'.",
+  "Module_resolution_kind_is_not_specified_using_0_6088" : "Module resolution kind is not specified, using '{0}'.",
+  "Module_name_0_was_successfully_resolved_to_1_6089" : "======== Module name '{0}' was successfully resolved to '{1}'. ========",
+  "Module_name_0_was_not_resolved_6090" : "======== Module name '{0}' was not resolved. ========",
+  "paths_option_is_specified_looking_for_a_pattern_to_match_module_name_0_6091" : "'paths' option is specified, looking for a pattern to match module name '{0}'.",
+  "Module_name_0_matched_pattern_1_6092" : "Module name '{0}', matched pattern '{1}'.",
+  "Trying_substitution_0_candidate_module_location_Colon_1_6093" : "Trying substitution '{0}', candidate module location: '{1}'.",
+  "Resolving_module_name_0_relative_to_base_url_1_2_6094" : "Resolving module name '{0}' relative to base url '{1}' - '{2}'.",
+  "Loading_module_as_file_Slash_folder_candidate_module_location_0_target_file_type_1_6095" : "Loading module as file / folder, candidate module location '{0}', target file type '{1}'.",
+  "File_0_does_not_exist_6096" : "File '{0}' does not exist.",
+  "File_0_exist_use_it_as_a_name_resolution_result_6097" : "File '{0}' exist - use it as a name resolution result.",
+  "Loading_module_0_from_node_modules_folder_target_file_type_1_6098" : "Loading module '{0}' from 'node_modules' folder, target file type '{1}'.",
+  "Found_package_json_at_0_6099" : "Found 'package.json' at '{0}'.",
+  "package_json_does_not_have_a_0_field_6100" : "'package.json' does not have a '{0}' field.",
+  "package_json_has_0_field_1_that_references_2_6101" : "'package.json' has '{0}' field '{1}' that references '{2}'.",
+  "Allow_javascript_files_to_be_compiled_6102" : "Allow javascript files to be compiled.",
+  "Option_0_should_have_array_of_strings_as_a_value_6103" : "Option '{0}' should have array of strings as a value.",
+  "Checking_if_0_is_the_longest_matching_prefix_for_1_2_6104" : "Checking if '{0}' is the longest matching prefix for '{1}' - '{2}'.",
+  "Expected_type_of_0_field_in_package_json_to_be_string_got_1_6105" : "Expected type of '{0}' field in 'package.json' to be 'string', got '{1}'.",
+  "baseUrl_option_is_set_to_0_using_this_value_to_resolve_non_relative_module_name_1_6106" : "'baseUrl' option is set to '{0}', using this value to resolve non-relative module name '{1}'.",
+  "rootDirs_option_is_set_using_it_to_resolve_relative_module_name_0_6107" : "'rootDirs' option is set, using it to resolve relative module name '{0}'.",
+  "Longest_matching_prefix_for_0_is_1_6108" : "Longest matching prefix for '{0}' is '{1}'.",
+  "Loading_0_from_the_root_dir_1_candidate_location_2_6109" : "Loading '{0}' from the root dir '{1}', candidate location '{2}'.",
+  "Trying_other_entries_in_rootDirs_6110" : "Trying other entries in 'rootDirs'.",
+  "Module_resolution_using_rootDirs_has_failed_6111" : "Module resolution using 'rootDirs' has failed.",
+  "Do_not_emit_use_strict_directives_in_module_output_6112" : "Do not emit 'use strict' directives in module output.",
+  "Enable_strict_null_checks_6113" : "Enable strict null checks.",
+  "Unknown_option_excludes_Did_you_mean_exclude_6114" : "Unknown option 'excludes'. Did you mean 'exclude'?",
+  "Raise_error_on_this_expressions_with_an_implied_any_type_6115" : "Raise error on 'this' expressions with an implied 'any' type.",
+  "Resolving_type_reference_directive_0_containing_file_1_root_directory_2_6116" : "======== Resolving type reference directive '{0}', containing file '{1}', root directory '{2}'. ========",
+  "Resolving_using_primary_search_paths_6117" : "Resolving using primary search paths...",
+  "Resolving_from_node_modules_folder_6118" : "Resolving from node_modules folder...",
+  "Type_reference_directive_0_was_successfully_resolved_to_1_primary_Colon_2_6119" : "======== Type reference directive '{0}' was successfully resolved to '{1}', primary: {2}. ========",
+  "Type_reference_directive_0_was_not_resolved_6120" : "======== Type reference directive '{0}' was not resolved. ========",
+  "Resolving_with_primary_search_path_0_6121" : "Resolving with primary search path '{0}'.",
+  "Root_directory_cannot_be_determined_skipping_primary_search_paths_6122" : "Root directory cannot be determined, skipping primary search paths.",
+  "Resolving_type_reference_directive_0_containing_file_1_root_directory_not_set_6123" : "======== Resolving type reference directive '{0}', containing file '{1}', root directory not set. ========",
+  "Type_declaration_files_to_be_included_in_compilation_6124" : "Type declaration files to be included in compilation.",
+  "Looking_up_in_node_modules_folder_initial_location_0_6125" : "Looking up in 'node_modules' folder, initial location '{0}'.",
+  "Containing_file_is_not_specified_and_root_directory_cannot_be_determined_skipping_lookup_in_node_mod_6126" : "Containing file is not specified and root directory cannot be determined, skipping lookup in 'node_modules' folder.",
+  "Resolving_type_reference_directive_0_containing_file_not_set_root_directory_1_6127" : "======== Resolving type reference directive '{0}', containing file not set, root directory '{1}'. ========",
+  "Resolving_type_reference_directive_0_containing_file_not_set_root_directory_not_set_6128" : "======== Resolving type reference directive '{0}', containing file not set, root directory not set. ========",
+  "Resolving_real_path_for_0_result_1_6130" : "Resolving real path for '{0}', result '{1}'.",
+  "Cannot_compile_modules_using_option_0_unless_the_module_flag_is_amd_or_system_6131" : "Cannot compile modules using option '{0}' unless the '--module' flag is 'amd' or 'system'.",
+  "File_name_0_has_a_1_extension_stripping_it_6132" : "File name '{0}' has a '{1}' extension - stripping it.",
+  "_0_is_declared_but_its_value_is_never_read_6133" : "'{0}' is declared but its value is never read.",
+  "Report_errors_on_unused_locals_6134" : "Report errors on unused locals.",
+  "Report_errors_on_unused_parameters_6135" : "Report errors on unused parameters.",
+  "The_maximum_dependency_depth_to_search_under_node_modules_and_load_JavaScript_files_6136" : "The maximum dependency depth to search under node_modules and load JavaScript files.",
+  "Cannot_import_type_declaration_files_Consider_importing_0_instead_of_1_6137" : "Cannot import type declaration files. Consider importing '{0}' instead of '{1}'.",
+  "Property_0_is_declared_but_its_value_is_never_read_6138" : "Property '{0}' is declared but its value is never read.",
+  "Import_emit_helpers_from_tslib_6139" : "Import emit helpers from 'tslib'.",
+  "Auto_discovery_for_typings_is_enabled_in_project_0_Running_extra_resolution_pass_for_module_1_using__6140" : "Auto discovery for typings is enabled in project '{0}'. Running extra resolution pass for module '{1}' using cache location '{2}'.",
+  "Parse_in_strict_mode_and_emit_use_strict_for_each_source_file_6141" : "Parse in strict mode and emit \"use strict\" for each source file.",
+  "Module_0_was_resolved_to_1_but_jsx_is_not_set_6142" : "Module '{0}' was resolved to '{1}', but '--jsx' is not set.",
+  "Module_0_was_resolved_as_locally_declared_ambient_module_in_file_1_6144" : "Module '{0}' was resolved as locally declared ambient module in file '{1}'.",
+  "Module_0_was_resolved_as_ambient_module_declared_in_1_since_this_file_was_not_modified_6145" : "Module '{0}' was resolved as ambient module declared in '{1}' since this file was not modified.",
+  "Specify_the_JSX_factory_function_to_use_when_targeting_react_JSX_emit_e_g_React_createElement_or_h_6146" : "Specify the JSX factory function to use when targeting 'react' JSX emit, e.g. 'React.createElement' or 'h'.",
+  "Resolution_for_module_0_was_found_in_cache_from_location_1_6147" : "Resolution for module '{0}' was found in cache from location '{1}'.",
+  "Directory_0_does_not_exist_skipping_all_lookups_in_it_6148" : "Directory '{0}' does not exist, skipping all lookups in it.",
+  "Show_diagnostic_information_6149" : "Show diagnostic information.",
+  "Show_verbose_diagnostic_information_6150" : "Show verbose diagnostic information.",
+  "Emit_a_single_file_with_source_maps_instead_of_having_a_separate_file_6151" : "Emit a single file with source maps instead of having a separate file.",
+  "Emit_the_source_alongside_the_sourcemaps_within_a_single_file_requires_inlineSourceMap_or_sourceMap__6152" : "Emit the source alongside the sourcemaps within a single file; requires '--inlineSourceMap' or '--sourceMap' to be set.",
+  "Transpile_each_file_as_a_separate_module_similar_to_ts_transpileModule_6153" : "Transpile each file as a separate module (similar to 'ts.transpileModule').",
+  "Print_names_of_generated_files_part_of_the_compilation_6154" : "Print names of generated files part of the compilation.",
+  "Print_names_of_files_part_of_the_compilation_6155" : "Print names of files part of the compilation.",
+  "The_locale_used_when_displaying_messages_to_the_user_e_g_en_us_6156" : "The locale used when displaying messages to the user (e.g. 'en-us')",
+  "Do_not_generate_custom_helper_functions_like_extends_in_compiled_output_6157" : "Do not generate custom helper functions like '__extends' in compiled output.",
+  "Do_not_include_the_default_library_file_lib_d_ts_6158" : "Do not include the default library file (lib.d.ts).",
+  "Do_not_add_triple_slash_references_or_imported_modules_to_the_list_of_compiled_files_6159" : "Do not add triple-slash references or imported modules to the list of compiled files.",
+  "Deprecated_Use_skipLibCheck_instead_Skip_type_checking_of_default_library_declaration_files_6160" : "[Deprecated] Use '--skipLibCheck' instead. Skip type checking of default library declaration files.",
+  "List_of_folders_to_include_type_definitions_from_6161" : "List of folders to include type definitions from.",
+  "Disable_size_limitations_on_JavaScript_projects_6162" : "Disable size limitations on JavaScript projects.",
+  "The_character_set_of_the_input_files_6163" : "The character set of the input files.",
+  "Emit_a_UTF_8_Byte_Order_Mark_BOM_in_the_beginning_of_output_files_6164" : "Emit a UTF-8 Byte Order Mark (BOM) in the beginning of output files.",
+  "Do_not_truncate_error_messages_6165" : "Do not truncate error messages.",
+  "Output_directory_for_generated_declaration_files_6166" : "Output directory for generated declaration files.",
+  "A_series_of_entries_which_re_map_imports_to_lookup_locations_relative_to_the_baseUrl_6167" : "A series of entries which re-map imports to lookup locations relative to the 'baseUrl'.",
+  "List_of_root_folders_whose_combined_content_represents_the_structure_of_the_project_at_runtime_6168" : "List of root folders whose combined content represents the structure of the project at runtime.",
+  "Show_all_compiler_options_6169" : "Show all compiler options.",
+  "Deprecated_Use_outFile_instead_Concatenate_and_emit_output_to_single_file_6170" : "[Deprecated] Use '--outFile' instead. Concatenate and emit output to single file",
+  "Command_line_Options_6171" : "Command-line Options",
+  "Basic_Options_6172" : "Basic Options",
+  "Strict_Type_Checking_Options_6173" : "Strict Type-Checking Options",
+  "Module_Resolution_Options_6174" : "Module Resolution Options",
+  "Source_Map_Options_6175" : "Source Map Options",
+  "Additional_Checks_6176" : "Additional Checks",
+  "Experimental_Options_6177" : "Experimental Options",
+  "Advanced_Options_6178" : "Advanced Options",
+  "Provide_full_support_for_iterables_in_for_of_spread_and_destructuring_when_targeting_ES5_or_ES3_6179" : "Provide full support for iterables in 'for-of', spread, and destructuring when targeting 'ES5' or 'ES3'.",
+  "Enable_all_strict_type_checking_options_6180" : "Enable all strict type-checking options.",
+  "List_of_language_service_plugins_6181" : "List of language service plugins.",
+  "Scoped_package_detected_looking_in_0_6182" : "Scoped package detected, looking in '{0}'",
+  "Reusing_resolution_of_module_0_to_file_1_from_old_program_6183" : "Reusing resolution of module '{0}' to file '{1}' from old program.",
+  "Reusing_module_resolutions_originating_in_0_since_resolutions_are_unchanged_from_old_program_6184" : "Reusing module resolutions originating in '{0}' since resolutions are unchanged from old program.",
+  "Disable_strict_checking_of_generic_signatures_in_function_types_6185" : "Disable strict checking of generic signatures in function types.",
+  "Enable_strict_checking_of_function_types_6186" : "Enable strict checking of function types.",
+  "Enable_strict_checking_of_property_initialization_in_classes_6187" : "Enable strict checking of property initialization in classes.",
+  "Numeric_separators_are_not_allowed_here_6188" : "Numeric separators are not allowed here.",
+  "Multiple_consecutive_numeric_separators_are_not_permitted_6189" : "Multiple consecutive numeric separators are not permitted.",
+  "Found_package_json_at_0_Package_ID_is_1_6190" : "Found 'package.json' at '{0}'. Package ID is '{1}'.",
+  "Whether_to_keep_outdated_console_output_in_watch_mode_instead_of_clearing_the_screen_6191" : "Whether to keep outdated console output in watch mode instead of clearing the screen.",
+  "All_imports_in_import_declaration_are_unused_6192" : "All imports in import declaration are unused.",
+  "Found_1_error_Watching_for_file_changes_6193" : "Found 1 error. Watching for file changes.",
+  "Found_0_errors_Watching_for_file_changes_6194" : "Found {0} errors. Watching for file changes.",
+  "Resolve_keyof_to_string_valued_property_names_only_no_numbers_or_symbols_6195" : "Resolve 'keyof' to string valued property names only (no numbers or symbols).",
+  "_0_is_declared_but_never_used_6196" : "'{0}' is declared but never used.",
+  "Include_modules_imported_with_json_extension_6197" : "Include modules imported with '.json' extension",
+  "All_destructured_elements_are_unused_6198" : "All destructured elements are unused.",
+  "All_variables_are_unused_6199" : "All variables are unused.",
+  "Projects_to_reference_6300" : "Projects to reference",
+  "Enable_project_compilation_6302" : "Enable project compilation",
+  "Project_references_may_not_form_a_circular_graph_Cycle_detected_Colon_0_6202" : "Project references may not form a circular graph. Cycle detected: {0}",
+  "Composite_projects_may_not_disable_declaration_emit_6304" : "Composite projects may not disable declaration emit.",
+  "Output_file_0_has_not_been_built_from_source_file_1_6305" : "Output file '{0}' has not been built from source file '{1}'.",
+  "Referenced_project_0_must_have_setting_composite_Colon_true_6306" : "Referenced project '{0}' must have setting \"composite\": true.",
+  "File_0_is_not_in_project_file_list_Projects_must_list_all_files_or_use_an_include_pattern_6307" : "File '{0}' is not in project file list. Projects must list all files or use an 'include' pattern.",
+  "Cannot_prepend_project_0_because_it_does_not_have_outFile_set_6308" : "Cannot prepend project '{0}' because it does not have 'outFile' set",
+  "Output_file_0_from_project_1_does_not_exist_6309" : "Output file '{0}' from project '{1}' does not exist",
+  "Project_0_is_out_of_date_because_oldest_output_1_is_older_than_newest_input_2_6350" : "Project '{0}' is out of date because oldest output '{1}' is older than newest input '{2}'",
+  "Project_0_is_up_to_date_because_newest_input_1_is_older_than_oldest_output_2_6351" : "Project '{0}' is up to date because newest input '{1}' is older than oldest output '{2}'",
+  "Project_0_is_out_of_date_because_output_file_1_does_not_exist_6352" : "Project '{0}' is out of date because output file '{1}' does not exist",
+  "Project_0_is_out_of_date_because_its_dependency_1_is_out_of_date_6353" : "Project '{0}' is out of date because its dependency '{1}' is out of date",
+  "Project_0_is_up_to_date_with_d_ts_files_from_its_dependencies_6354" : "Project '{0}' is up to date with .d.ts files from its dependencies",
+  "Projects_in_this_build_Colon_0_6355" : "Projects in this build: {0}",
+  "A_non_dry_build_would_delete_the_following_files_Colon_0_6356" : "A non-dry build would delete the following files: {0}",
+  "A_non_dry_build_would_build_project_0_6357" : "A non-dry build would build project '{0}'",
+  "Building_project_0_6358" : "Building project '{0}'...",
+  "Updating_output_timestamps_of_project_0_6359" : "Updating output timestamps of project '{0}'...",
+  "delete_this_Project_0_is_up_to_date_because_it_was_previously_built_6360" : "delete this - Project '{0}' is up to date because it was previously built",
+  "Project_0_is_up_to_date_6361" : "Project '{0}' is up to date",
+  "Skipping_build_of_project_0_because_its_dependency_1_has_errors_6362" : "Skipping build of project '{0}' because its dependency '{1}' has errors",
+  "Project_0_can_t_be_built_because_its_dependency_1_has_errors_6363" : "Project '{0}' can't be built because its dependency '{1}' has errors",
+  "Build_one_or_more_projects_and_their_dependencies_if_out_of_date_6364" : "Build one or more projects and their dependencies, if out of date",
+  "Delete_the_outputs_of_all_projects_6365" : "Delete the outputs of all projects",
+  "Enable_verbose_logging_6366" : "Enable verbose logging",
+  "Show_what_would_be_built_or_deleted_if_specified_with_clean_6367" : "Show what would be built (or deleted, if specified with '--clean')",
+  "Build_all_projects_including_those_that_appear_to_be_up_to_date_6368" : "Build all projects, including those that appear to be up to date",
+  "Option_build_must_be_the_first_command_line_argument_6369" : "Option '--build' must be the first command line argument.",
+  "Options_0_and_1_cannot_be_combined_6370" : "Options '{0}' and '{1}' cannot be combined.",
+  "Skipping_clean_because_not_all_projects_could_be_located_6371" : "Skipping clean because not all projects could be located",
+  "Variable_0_implicitly_has_an_1_type_7005" : "Variable '{0}' implicitly has an '{1}' type.",
+  "Parameter_0_implicitly_has_an_1_type_7006" : "Parameter '{0}' implicitly has an '{1}' type.",
+  "Member_0_implicitly_has_an_1_type_7008" : "Member '{0}' implicitly has an '{1}' type.",
+  "new_expression_whose_target_lacks_a_construct_signature_implicitly_has_an_any_type_7009" : "'new' expression, whose target lacks a construct signature, implicitly has an 'any' type.",
+  "_0_which_lacks_return_type_annotation_implicitly_has_an_1_return_type_7010" : "'{0}', which lacks return-type annotation, implicitly has an '{1}' return type.",
+  "Function_expression_which_lacks_return_type_annotation_implicitly_has_an_0_return_type_7011" : "Function expression, which lacks return-type annotation, implicitly has an '{0}' return type.",
+  "Construct_signature_which_lacks_return_type_annotation_implicitly_has_an_any_return_type_7013" : "Construct signature, which lacks return-type annotation, implicitly has an 'any' return type.",
+  "Element_implicitly_has_an_any_type_because_index_expression_is_not_of_type_number_7015" : "Element implicitly has an 'any' type because index expression is not of type 'number'.",
+  "Could_not_find_a_declaration_file_for_module_0_1_implicitly_has_an_any_type_7016" : "Could not find a declaration file for module '{0}'. '{1}' implicitly has an 'any' type.",
+  "Element_implicitly_has_an_any_type_because_type_0_has_no_index_signature_7017" : "Element implicitly has an 'any' type because type '{0}' has no index signature.",
+  "Object_literal_s_property_0_implicitly_has_an_1_type_7018" : "Object literal's property '{0}' implicitly has an '{1}' type.",
+  "Rest_parameter_0_implicitly_has_an_any_type_7019" : "Rest parameter '{0}' implicitly has an 'any[]' type.",
+  "Call_signature_which_lacks_return_type_annotation_implicitly_has_an_any_return_type_7020" : "Call signature, which lacks return-type annotation, implicitly has an 'any' return type.",
+  "_0_implicitly_has_type_any_because_it_does_not_have_a_type_annotation_and_is_referenced_directly_or__7022" : "'{0}' implicitly has type 'any' because it does not have a type annotation and is referenced directly or indirectly in its own initializer.",
+  "_0_implicitly_has_return_type_any_because_it_does_not_have_a_return_type_annotation_and_is_reference_7023" : "'{0}' implicitly has return type 'any' because it does not have a return type annotation and is referenced directly or indirectly in one of its return expressions.",
+  "Function_implicitly_has_return_type_any_because_it_does_not_have_a_return_type_annotation_and_is_ref_7024" : "Function implicitly has return type 'any' because it does not have a return type annotation and is referenced directly or indirectly in one of its return expressions.",
+  "Generator_implicitly_has_type_0_because_it_does_not_yield_any_values_Consider_supplying_a_return_typ_7025" : "Generator implicitly has type '{0}' because it does not yield any values. Consider supplying a return type.",
+  "JSX_element_implicitly_has_type_any_because_no_interface_JSX_0_exists_7026" : "JSX element implicitly has type 'any' because no interface 'JSX.{0}' exists.",
+  "Unreachable_code_detected_7027" : "Unreachable code detected.",
+  "Unused_label_7028" : "Unused label.",
+  "Fallthrough_case_in_switch_7029" : "Fallthrough case in switch.",
+  "Not_all_code_paths_return_a_value_7030" : "Not all code paths return a value.",
+  "Binding_element_0_implicitly_has_an_1_type_7031" : "Binding element '{0}' implicitly has an '{1}' type.",
+  "Property_0_implicitly_has_type_any_because_its_set_accessor_lacks_a_parameter_type_annotation_7032" : "Property '{0}' implicitly has type 'any', because its set accessor lacks a parameter type annotation.",
+  "Property_0_implicitly_has_type_any_because_its_get_accessor_lacks_a_return_type_annotation_7033" : "Property '{0}' implicitly has type 'any', because its get accessor lacks a return type annotation.",
+  "Variable_0_implicitly_has_type_1_in_some_locations_where_its_type_cannot_be_determined_7034" : "Variable '{0}' implicitly has type '{1}' in some locations where its type cannot be determined.",
+  "Try_npm_install_types_Slash_0_if_it_exists_or_add_a_new_declaration_d_ts_file_containing_declare_mod_7035" : "Try `npm install @types/{0}` if it exists or add a new declaration (.d.ts) file containing `declare module '{0}';`",
+  "Dynamic_import_s_specifier_must_be_of_type_string_but_here_has_type_0_7036" : "Dynamic import's specifier must be of type 'string', but here has type '{0}'.",
+  "Enables_emit_interoperability_between_CommonJS_and_ES_Modules_via_creation_of_namespace_objects_for__7037" : "Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'.",
+  "A_namespace_style_import_cannot_be_called_or_constructed_and_will_cause_a_failure_at_runtime_7038" : "A namespace-style import cannot be called or constructed, and will cause a failure at runtime.",
+  "Mapped_object_type_implicitly_has_an_any_template_type_7039" : "Mapped object type implicitly has an 'any' template type.",
+  "You_cannot_rename_this_element_8000" : "You cannot rename this element.",
+  "You_cannot_rename_elements_that_are_defined_in_the_standard_TypeScript_library_8001" : "You cannot rename elements that are defined in the standard TypeScript library.",
+  "import_can_only_be_used_in_a_ts_file_8002" : "'import ... =' can only be used in a .ts file.",
+  "export_can_only_be_used_in_a_ts_file_8003" : "'export=' can only be used in a .ts file.",
+  "type_parameter_declarations_can_only_be_used_in_a_ts_file_8004" : "'type parameter declarations' can only be used in a .ts file.",
+  "implements_clauses_can_only_be_used_in_a_ts_file_8005" : "'implements clauses' can only be used in a .ts file.",
+  "interface_declarations_can_only_be_used_in_a_ts_file_8006" : "'interface declarations' can only be used in a .ts file.",
+  "module_declarations_can_only_be_used_in_a_ts_file_8007" : "'module declarations' can only be used in a .ts file.",
+  "type_aliases_can_only_be_used_in_a_ts_file_8008" : "'type aliases' can only be used in a .ts file.",
+  "_0_can_only_be_used_in_a_ts_file_8009" : "'{0}' can only be used in a .ts file.",
+  "types_can_only_be_used_in_a_ts_file_8010" : "'types' can only be used in a .ts file.",
+  "type_arguments_can_only_be_used_in_a_ts_file_8011" : "'type arguments' can only be used in a .ts file.",
+  "parameter_modifiers_can_only_be_used_in_a_ts_file_8012" : "'parameter modifiers' can only be used in a .ts file.",
+  "non_null_assertions_can_only_be_used_in_a_ts_file_8013" : "'non-null assertions' can only be used in a .ts file.",
+  "enum_declarations_can_only_be_used_in_a_ts_file_8015" : "'enum declarations' can only be used in a .ts file.",
+  "type_assertion_expressions_can_only_be_used_in_a_ts_file_8016" : "'type assertion expressions' can only be used in a .ts file.",
+  "Octal_literal_types_must_use_ES2015_syntax_Use_the_syntax_0_8017" : "Octal literal types must use ES2015 syntax. Use the syntax '{0}'.",
+  "Octal_literals_are_not_allowed_in_enums_members_initializer_Use_the_syntax_0_8018" : "Octal literals are not allowed in enums members initializer. Use the syntax '{0}'.",
+  "Report_errors_in_js_files_8019" : "Report errors in .js files.",
+  "JSDoc_types_can_only_be_used_inside_documentation_comments_8020" : "JSDoc types can only be used inside documentation comments.",
+  "JSDoc_typedef_tag_should_either_have_a_type_annotation_or_be_followed_by_property_or_member_tags_8021" : "JSDoc '@typedef' tag should either have a type annotation or be followed by '@property' or '@member' tags.",
+  "JSDoc_0_is_not_attached_to_a_class_8022" : "JSDoc '@{0}' is not attached to a class.",
+  "JSDoc_0_1_does_not_match_the_extends_2_clause_8023" : "JSDoc '@{0} {1}' does not match the 'extends {2}' clause.",
+  "JSDoc_param_tag_has_name_0_but_there_is_no_parameter_with_that_name_8024" : "JSDoc '@param' tag has name '{0}', but there is no parameter with that name.",
+  "Class_declarations_cannot_have_more_than_one_augments_or_extends_tag_8025" : "Class declarations cannot have more than one `@augments` or `@extends` tag.",
+  "Expected_0_type_arguments_provide_these_with_an_extends_tag_8026" : "Expected {0} type arguments; provide these with an '@extends' tag.",
+  "Expected_0_1_type_arguments_provide_these_with_an_extends_tag_8027" : "Expected {0}-{1} type arguments; provide these with an '@extends' tag.",
+  "JSDoc_may_only_appear_in_the_last_parameter_of_a_signature_8028" : "JSDoc '...' may only appear in the last parameter of a signature.",
+  "JSDoc_param_tag_has_name_0_but_there_is_no_parameter_with_that_name_It_would_match_arguments_if_it_h_8029" : "JSDoc '@param' tag has name '{0}', but there is no parameter with that name. It would match 'arguments' if it had an array type.",
+  "Only_identifiers_Slashqualified_names_with_optional_type_arguments_are_currently_supported_in_a_clas_9002" : "Only identifiers/qualified-names with optional type arguments are currently supported in a class 'extends' clause.",
+  "class_expressions_are_not_currently_supported_9003" : "'class' expressions are not currently supported.",
+  "Language_service_is_disabled_9004" : "Language service is disabled.",
+  "JSX_attributes_must_only_be_assigned_a_non_empty_expression_17000" : "JSX attributes must only be assigned a non-empty 'expression'.",
+  "JSX_elements_cannot_have_multiple_attributes_with_the_same_name_17001" : "JSX elements cannot have multiple attributes with the same name.",
+  "Expected_corresponding_JSX_closing_tag_for_0_17002" : "Expected corresponding JSX closing tag for '{0}'.",
+  "JSX_attribute_expected_17003" : "JSX attribute expected.",
+  "Cannot_use_JSX_unless_the_jsx_flag_is_provided_17004" : "Cannot use JSX unless the '--jsx' flag is provided.",
+  "A_constructor_cannot_contain_a_super_call_when_its_class_extends_null_17005" : "A constructor cannot contain a 'super' call when its class extends 'null'.",
+  "An_unary_expression_with_the_0_operator_is_not_allowed_in_the_left_hand_side_of_an_exponentiation_ex_17006" : "An unary expression with the '{0}' operator is not allowed in the left-hand side of an exponentiation expression. Consider enclosing the expression in parentheses.",
+  "A_type_assertion_expression_is_not_allowed_in_the_left_hand_side_of_an_exponentiation_expression_Con_17007" : "A type assertion expression is not allowed in the left-hand side of an exponentiation expression. Consider enclosing the expression in parentheses.",
+  "JSX_element_0_has_no_corresponding_closing_tag_17008" : "JSX element '{0}' has no corresponding closing tag.",
+  "super_must_be_called_before_accessing_this_in_the_constructor_of_a_derived_class_17009" : "'super' must be called before accessing 'this' in the constructor of a derived class.",
+  "Unknown_type_acquisition_option_0_17010" : "Unknown type acquisition option '{0}'.",
+  "super_must_be_called_before_accessing_a_property_of_super_in_the_constructor_of_a_derived_class_17011" : "'super' must be called before accessing a property of 'super' in the constructor of a derived class.",
+  "_0_is_not_a_valid_meta_property_for_keyword_1_Did_you_mean_2_17012" : "'{0}' is not a valid meta-property for keyword '{1}'. Did you mean '{2}'?",
+  "Meta_property_0_is_only_allowed_in_the_body_of_a_function_declaration_function_expression_or_constru_17013" : "Meta-property '{0}' is only allowed in the body of a function declaration, function expression, or constructor.",
+  "JSX_fragment_has_no_corresponding_closing_tag_17014" : "JSX fragment has no corresponding closing tag.",
+  "Expected_corresponding_closing_tag_for_JSX_fragment_17015" : "Expected corresponding closing tag for JSX fragment.",
+  "JSX_fragment_is_not_supported_when_using_jsxFactory_17016" : "JSX fragment is not supported when using --jsxFactory",
+  "JSX_fragment_is_not_supported_when_using_an_inline_JSX_factory_pragma_17017" : "JSX fragment is not supported when using an inline JSX factory pragma",
+  "Circularity_detected_while_resolving_configuration_Colon_0_18000" : "Circularity detected while resolving configuration: {0}",
+  "A_path_in_an_extends_option_must_be_relative_or_rooted_but_0_is_not_18001" : "A path in an 'extends' option must be relative or rooted, but '{0}' is not.",
+  "The_files_list_in_config_file_0_is_empty_18002" : "The 'files' list in config file '{0}' is empty.",
+  "No_inputs_were_found_in_config_file_0_Specified_include_paths_were_1_and_exclude_paths_were_2_18003" : "No inputs were found in config file '{0}'. Specified 'include' paths were '{1}' and 'exclude' paths were '{2}'.",
+  "File_is_a_CommonJS_module_it_may_be_converted_to_an_ES6_module_80001" : "File is a CommonJS module; it may be converted to an ES6 module.",
+  "This_constructor_function_may_be_converted_to_a_class_declaration_80002" : "This constructor function may be converted to a class declaration.",
+  "Import_may_be_converted_to_a_default_import_80003" : "Import may be converted to a default import.",
+  "JSDoc_types_may_be_moved_to_TypeScript_types_80004" : "JSDoc types may be moved to TypeScript types.",
+  "require_call_may_be_converted_to_an_import_80005" : "'require' call may be converted to an import.",
+  "Add_missing_super_call_90001" : "Add missing 'super()' call",
+  "Make_super_call_the_first_statement_in_the_constructor_90002" : "Make 'super()' call the first statement in the constructor",
+  "Change_extends_to_implements_90003" : "Change 'extends' to 'implements'",
+  "Remove_declaration_for_Colon_0_90004" : "Remove declaration for: '{0}'",
+  "Remove_import_from_0_90005" : "Remove import from '{0}'",
+  "Implement_interface_0_90006" : "Implement interface '{0}'",
+  "Implement_inherited_abstract_class_90007" : "Implement inherited abstract class",
+  "Add_0_to_unresolved_variable_90008" : "Add '{0}.' to unresolved variable",
+  "Remove_destructuring_90009" : "Remove destructuring",
+  "Remove_variable_statement_90010" : "Remove variable statement",
+  "Import_0_from_module_1_90013" : "Import '{0}' from module \"{1}\"",
+  "Change_0_to_1_90014" : "Change '{0}' to '{1}'",
+  "Add_0_to_existing_import_declaration_from_1_90015" : "Add '{0}' to existing import declaration from \"{1}\"",
+  "Declare_property_0_90016" : "Declare property '{0}'",
+  "Add_index_signature_for_property_0_90017" : "Add index signature for property '{0}'",
+  "Disable_checking_for_this_file_90018" : "Disable checking for this file",
+  "Ignore_this_error_message_90019" : "Ignore this error message",
+  "Initialize_property_0_in_the_constructor_90020" : "Initialize property '{0}' in the constructor",
+  "Initialize_static_property_0_90021" : "Initialize static property '{0}'",
+  "Change_spelling_to_0_90022" : "Change spelling to '{0}'",
+  "Declare_method_0_90023" : "Declare method '{0}'",
+  "Declare_static_method_0_90024" : "Declare static method '{0}'",
+  "Prefix_0_with_an_underscore_90025" : "Prefix '{0}' with an underscore",
+  "Rewrite_as_the_indexed_access_type_0_90026" : "Rewrite as the indexed access type '{0}'",
+  "Declare_static_property_0_90027" : "Declare static property '{0}'",
+  "Call_decorator_expression_90028" : "Call decorator expression",
+  "Add_async_modifier_to_containing_function_90029" : "Add async modifier to containing function",
+  "Convert_function_to_an_ES2015_class_95001" : "Convert function to an ES2015 class",
+  "Convert_function_0_to_class_95002" : "Convert function '{0}' to class",
+  "Extract_to_0_in_1_95004" : "Extract to {0} in {1}",
+  "Extract_function_95005" : "Extract function",
+  "Extract_constant_95006" : "Extract constant",
+  "Extract_to_0_in_enclosing_scope_95007" : "Extract to {0} in enclosing scope",
+  "Extract_to_0_in_1_scope_95008" : "Extract to {0} in {1} scope",
+  "Annotate_with_type_from_JSDoc_95009" : "Annotate with type from JSDoc",
+  "Annotate_with_types_from_JSDoc_95010" : "Annotate with types from JSDoc",
+  "Infer_type_of_0_from_usage_95011" : "Infer type of '{0}' from usage",
+  "Infer_parameter_types_from_usage_95012" : "Infer parameter types from usage",
+  "Convert_to_default_import_95013" : "Convert to default import",
+  "Install_0_95014" : "Install '{0}'",
+  "Replace_import_with_0_95015" : "Replace import with '{0}'.",
+  "Use_synthetic_default_member_95016" : "Use synthetic 'default' member.",
+  "Convert_to_ES6_module_95017" : "Convert to ES6 module",
+  "Add_undefined_type_to_property_0_95018" : "Add 'undefined' type to property '{0}'",
+  "Add_initializer_to_property_0_95019" : "Add initializer to property '{0}'",
+  "Add_definite_assignment_assertion_to_property_0_95020" : "Add definite assignment assertion to property '{0}'",
+  "Add_all_missing_members_95022" : "Add all missing members",
+  "Infer_all_types_from_usage_95023" : "Infer all types from usage",
+  "Delete_all_unused_declarations_95024" : "Delete all unused declarations",
+  "Prefix_all_unused_declarations_with_where_possible_95025" : "Prefix all unused declarations with '_' where possible",
+  "Fix_all_detected_spelling_errors_95026" : "Fix all detected spelling errors",
+  "Add_initializers_to_all_uninitialized_properties_95027" : "Add initializers to all uninitialized properties",
+  "Add_definite_assignment_assertions_to_all_uninitialized_properties_95028" : "Add definite assignment assertions to all uninitialized properties",
+  "Add_undefined_type_to_all_uninitialized_properties_95029" : "Add undefined type to all uninitialized properties",
+  "Change_all_jsdoc_style_types_to_TypeScript_95030" : "Change all jsdoc-style types to TypeScript",
+  "Change_all_jsdoc_style_types_to_TypeScript_and_add_undefined_to_nullable_types_95031" : "Change all jsdoc-style types to TypeScript (and add '| undefined' to nullable types)",
+  "Implement_all_unimplemented_interfaces_95032" : "Implement all unimplemented interfaces",
+  "Install_all_missing_types_packages_95033" : "Install all missing types packages",
+  "Rewrite_all_as_indexed_access_types_95034" : "Rewrite all as indexed access types",
+  "Convert_all_to_default_imports_95035" : "Convert all to default imports",
+  "Make_all_super_calls_the_first_statement_in_their_constructor_95036" : "Make all 'super()' calls the first statement in their constructor",
+  "Add_qualifier_to_all_unresolved_variables_matching_a_member_name_95037" : "Add qualifier to all unresolved variables matching a member name",
+  "Change_all_extended_interfaces_to_implements_95038" : "Change all extended interfaces to 'implements'",
+  "Add_all_missing_super_calls_95039" : "Add all missing super calls",
+  "Implement_all_inherited_abstract_classes_95040" : "Implement all inherited abstract classes",
+  "Add_all_missing_async_modifiers_95041" : "Add all missing 'async' modifiers",
+  "Add_ts_ignore_to_all_error_messages_95042" : "Add '@ts-ignore' to all error messages",
+  "Annotate_everything_with_types_from_JSDoc_95043" : "Annotate everything with types from JSDoc",
+  "Add_to_all_uncalled_decorators_95044" : "Add '()' to all uncalled decorators",
+  "Convert_all_constructor_functions_to_classes_95045" : "Convert all constructor functions to classes",
+  "Generate_get_and_set_accessors_95046" : "Generate 'get' and 'set' accessors",
+  "Convert_require_to_import_95047" : "Convert 'require' to 'import'",
+  "Convert_all_require_to_import_95048" : "Convert all 'require' to 'import'",
+  "Move_to_a_new_file_95049" : "Move to a new file",
+  "Remove_unreachable_code_95050" : "Remove unreachable code",
+  "Remove_all_unreachable_code_95051" : "Remove all unreachable code",
+  "Add_missing_typeof_95052" : "Add missing 'typeof'",
+  "Remove_unused_label_95053" : "Remove unused label",
+  "Remove_all_unused_labels_95054" : "Remove all unused labels",
+  "Convert_0_to_mapped_object_type_95055" : "Convert '{0}' to mapped object type",
+  "Convert_namespace_import_to_named_imports_95056" : "Convert namespace import to named imports",
+  "Convert_named_imports_to_namespace_import_95057" : "Convert named imports to namespace import"
+}
\ No newline at end of file
diff --git a/src/compiler/diagnosticMessages.json b/src/parser/diagnosticMessages.json
similarity index 100%
rename from src/compiler/diagnosticMessages.json
rename to src/parser/diagnosticMessages.json
diff --git a/src/compiler/parser.ts b/src/parser/parser.ts
similarity index 100%
rename from src/compiler/parser.ts
rename to src/parser/parser.ts
diff --git a/src/compiler/scanner.ts b/src/parser/scanner.ts
similarity index 100%
rename from src/compiler/scanner.ts
rename to src/parser/scanner.ts
diff --git a/src/compiler/sys.ts b/src/parser/sys.ts
similarity index 100%
rename from src/compiler/sys.ts
rename to src/parser/sys.ts
diff --git a/src/parser/tsconfig.json b/src/parser/tsconfig.json
new file mode 100644
index 00000000000..4ccdc05fd27
--- /dev/null
+++ b/src/parser/tsconfig.json
@@ -0,0 +1,18 @@
+{
+    "extends": "../tsconfig-base",
+    "compilerOptions": {
+        "outFile": "../../built/local/parser.js"
+    },
+    "files": [
+        "types.ts",
+        "sys.ts",
+        "diagnosticInformationMap.generated.ts",
+        "scanner.ts",
+        "utilities.ts",
+        "parser.ts",
+        "commandLineParser.ts"
+    ],
+    "references": [
+        { "path": "../core" }
+    ]
+}
diff --git a/src/compiler/types.ts b/src/parser/types.ts
similarity index 97%
rename from src/compiler/types.ts
rename to src/parser/types.ts
index 1378be2a724..c6f00da2913 100644
--- a/src/compiler/types.ts
+++ b/src/parser/types.ts
@@ -1,54 +1,4 @@
 namespace ts {
-    /**
-     * Type of objects whose values are all of the same type.
-     * The `in` and `for-in` operators can *not* be safely used,
-     * since `Object.prototype` may be modified by outside code.
-     */
-    export interface MapLike<T> {
-        [index: string]: T;
-    }
-
-    /** ES6 Map interface, only read methods included. */
-    export interface ReadonlyMap<T> {
-        get(key: string): T | undefined;
-        has(key: string): boolean;
-        forEach(action: (value: T, key: string) => void): void;
-        readonly size: number;
-        keys(): Iterator<string>;
-        values(): Iterator<T>;
-        entries(): Iterator<[string, T]>;
-    }
-
-    /** ES6 Map interface. */
-    export interface Map<T> extends ReadonlyMap<T> {
-        set(key: string, value: T): this;
-        delete(key: string): boolean;
-        clear(): void;
-    }
-
-    /** ES6 Iterator type. */
-    export interface Iterator<T> {
-        next(): { value: T, done: false } | { value: never, done: true };
-    }
-
-    /** Array that is only intended to be pushed to, never read. */
-    export interface Push<T> {
-        push(...values: T[]): void;
-    }
-
-    /* @internal */
-    export type EqualityComparer<T> = (a: T, b: T) => boolean;
-
-    /* @internal */
-    export type Comparer<T> = (a: T, b: T) => Comparison;
-
-    /* @internal */
-    export const enum Comparison {
-        LessThan    = -1,
-        EqualTo     = 0,
-        GreaterThan = 1
-    }
-
     // branded string type used to store absolute, normalized and canonicalized paths
     // arbitrary file name can be converted to Path via toPath function
     export type Path = string & { __pathBrand: any };
@@ -3619,13 +3569,6 @@ namespace ts {
     /** SymbolTable based on ES6 Map interface. */
     export type SymbolTable = UnderscoreEscapedMap<Symbol>;
 
-    /** Represents a "prefix*suffix" pattern. */
-    /* @internal */
-    export interface Pattern {
-        prefix: string;
-        suffix: string;
-    }
-
     /** Used to track a `declare module "foo*"`-like declaration. */
     /* @internal */
     export interface PatternAmbientModule {
@@ -5340,10 +5283,6 @@ namespace ts {
         newLength: number;
     }
 
-    export interface SortedArray<T> extends Array<T> {
-        " __sortedArrayBrand": any;
-    }
-
     /* @internal */
     export interface DiagnosticCollection {
         // Adds a diagnostic to this diagnostic collection.
diff --git a/src/compiler/utilities.ts b/src/parser/utilities.ts
similarity index 77%
rename from src/compiler/utilities.ts
rename to src/parser/utilities.ts
index 156555124bd..52e81dd517c 100644
--- a/src/compiler/utilities.ts
+++ b/src/parser/utilities.ts
@@ -1,3 +1,33 @@
+/** Non-internal stuff goes here */
+namespace ts {
+    export const emptyArray: never[] = [] as never[];
+    export function closeFileWatcher(watcher: FileWatcher) {
+        watcher.close();
+    }
+
+    export function isExternalModuleNameRelative(moduleName: string): boolean {
+        // TypeScript 1.0 spec (April 2014): 11.2.1
+        // An external module name is "relative" if the first term is "." or "..".
+        // Update: We also consider a path like `C:\foo.ts` "relative" because we do not search for it in `node_modules` or treat it as an ambient module.
+        return pathIsRelative(moduleName) || isRootedDiskPath(moduleName);
+    }
+
+    export function sortAndDeduplicateDiagnostics<T extends Diagnostic>(diagnostics: ReadonlyArray<T>): T[] {
+        return sortAndDeduplicate<T>(diagnostics, compareDiagnostics);
+    }
+
+    export function toPath(fileName: string, basePath: string | undefined, getCanonicalFileName: (path: string) => string): Path {
+        const nonCanonicalizedPath = isRootedDiskPath(fileName)
+            ? normalizePath(fileName)
+            : getNormalizedAbsolutePath(fileName, basePath);
+        return <Path>getCanonicalFileName(nonCanonicalizedPath);
+    }
+
+    export function hasEntries(map: ReadonlyUnderscoreEscapedMap<any> | undefined): map is ReadonlyUnderscoreEscapedMap<any> {
+        return !!map && !!map.size;
+    }
+}
+
 /* @internal */
 namespace ts {
     export const resolvingEmptyArray: never[] = [] as never[];
@@ -19,6 +49,21 @@ namespace ts {
         return undefined;
     }
 
+    /** Create a new escaped identifier map. */
+    export function createUnderscoreEscapedMap<T>(): UnderscoreEscapedMap<T> {
+        return new MapCtr<T>() as UnderscoreEscapedMap<T>;
+    }
+
+    export function createSymbolTable(symbols?: ReadonlyArray<Symbol>): SymbolTable {
+        const result = createMap<Symbol>() as SymbolTable;
+        if (symbols) {
+            for (const symbol of symbols) {
+                result.set(symbol.escapedName, symbol);
+            }
+        }
+        return result;
+    }
+
     const stringWriter = createSingleLineStringWriter();
 
     function createSingleLineStringWriter(): EmitTextWriter {
@@ -58,6 +103,109 @@ namespace ts {
         };
     }
 
+    export function changesAffectModuleResolution(oldOptions: CompilerOptions, newOptions: CompilerOptions): boolean {
+        return !oldOptions ||
+            (oldOptions.module !== newOptions.module) ||
+            (oldOptions.moduleResolution !== newOptions.moduleResolution) ||
+            (oldOptions.noResolve !== newOptions.noResolve) ||
+            (oldOptions.target !== newOptions.target) ||
+            (oldOptions.noLib !== newOptions.noLib) ||
+            (oldOptions.jsx !== newOptions.jsx) ||
+            (oldOptions.allowJs !== newOptions.allowJs) ||
+            (oldOptions.rootDir !== newOptions.rootDir) ||
+            (oldOptions.configFilePath !== newOptions.configFilePath) ||
+            (oldOptions.baseUrl !== newOptions.baseUrl) ||
+            (oldOptions.maxNodeModuleJsDepth !== newOptions.maxNodeModuleJsDepth) ||
+            !arrayIsEqualTo(oldOptions.lib, newOptions.lib) ||
+            !arrayIsEqualTo(oldOptions.typeRoots, newOptions.typeRoots) ||
+            !arrayIsEqualTo(oldOptions.rootDirs, newOptions.rootDirs) ||
+            !equalOwnProperties(oldOptions.paths, newOptions.paths);
+    }
+
+    /**
+     * Iterates through the parent chain of a node and performs the callback on each parent until the callback
+     * returns a truthy value, then returns that value.
+     * If no such value is found, it applies the callback until the parent pointer is undefined or the callback returns "quit"
+     * At that point findAncestor returns undefined.
+     */
+    export function findAncestor<T extends Node>(node: Node | undefined, callback: (element: Node) => element is T): T | undefined;
+    export function findAncestor(node: Node | undefined, callback: (element: Node) => boolean | "quit"): Node | undefined;
+    export function findAncestor(node: Node, callback: (element: Node) => boolean | "quit"): Node | undefined {
+        while (node) {
+            const result = callback(node);
+            if (result === "quit") {
+                return undefined;
+            }
+            else if (result) {
+                return node;
+            }
+            node = node.parent;
+        }
+        return undefined;
+    }
+
+    /**
+     * Calls `callback` for each entry in the map, returning the first truthy result.
+     * Use `map.forEach` instead for normal iteration.
+     */
+    export function forEachEntry<T, U>(map: ReadonlyUnderscoreEscapedMap<T>, callback: (value: T, key: __String) => U | undefined): U | undefined;
+    export function forEachEntry<T, U>(map: ReadonlyMap<T>, callback: (value: T, key: string) => U | undefined): U | undefined;
+    export function forEachEntry<T, U>(map: ReadonlyUnderscoreEscapedMap<T> | ReadonlyMap<T>, callback: (value: T, key: (string & __String)) => U | undefined): U | undefined {
+        const iterator = map.entries();
+        for (let { value: pair, done } = iterator.next(); !done; { value: pair, done } = iterator.next()) {
+            const [key, value] = pair;
+            const result = callback(value, key as (string & __String));
+            if (result) {
+                return result;
+            }
+        }
+        return undefined;
+    }
+
+    /** `forEachEntry` for just keys. */
+    export function forEachKey<T>(map: ReadonlyUnderscoreEscapedMap<{}>, callback: (key: __String) => T | undefined): T | undefined;
+    export function forEachKey<T>(map: ReadonlyMap<{}>, callback: (key: string) => T | undefined): T | undefined;
+    export function forEachKey<T>(map: ReadonlyUnderscoreEscapedMap<{}> | ReadonlyMap<{}>, callback: (key: string & __String) => T | undefined): T | undefined {
+        const iterator = map.keys();
+        for (let { value: key, done } = iterator.next(); !done; { value: key, done } = iterator.next()) {
+            const result = callback(key as string & __String);
+            if (result) {
+                return result;
+            }
+        }
+        return undefined;
+    }
+
+    /** Copy entries from `source` to `target`. */
+    export function copyEntries<T>(source: ReadonlyUnderscoreEscapedMap<T>, target: UnderscoreEscapedMap<T>): void;
+    export function copyEntries<T>(source: ReadonlyMap<T>, target: Map<T>): void;
+    export function copyEntries<T, U extends UnderscoreEscapedMap<T> | Map<T>>(source: U, target: U): void {
+        (source as Map<T>).forEach((value, key) => {
+            (target as Map<T>).set(key, value);
+        });
+    }
+
+    /**
+     * Creates a set from the elements of an array.
+     *
+     * @param array the array of input elements.
+     */
+    export function arrayToSet(array: ReadonlyArray<string>): Map<true>;
+    export function arrayToSet<T>(array: ReadonlyArray<T>, makeKey: (value: T) => string | undefined): Map<true>;
+    export function arrayToSet<T>(array: ReadonlyArray<T>, makeKey: (value: T) => __String | undefined): UnderscoreEscapedMap<true>;
+    export function arrayToSet(array: ReadonlyArray<any>, makeKey?: (value: any) => string | __String | undefined): Map<true> | UnderscoreEscapedMap<true> {
+        return arrayToMap<any, true>(array, makeKey || (s => s), () => true);
+    }
+
+    export function cloneMap(map: SymbolTable): SymbolTable;
+    export function cloneMap<T>(map: ReadonlyMap<T>): Map<T>;
+    export function cloneMap<T>(map: ReadonlyUnderscoreEscapedMap<T>): UnderscoreEscapedMap<T>;
+    export function cloneMap<T>(map: ReadonlyMap<T> | ReadonlyUnderscoreEscapedMap<T> | SymbolTable): Map<T> | UnderscoreEscapedMap<T> | SymbolTable {
+        const clone = createMap<T>();
+        copyEntries(map as Map<T>, clone);
+        return clone;
+    }
+
     export function usingSingleLineStringWriter(action: (writer: EmitTextWriter) => void): string {
         const oldString = stringWriter.getText();
         try {
@@ -843,7 +991,7 @@ namespace ts {
                 // At this point, node is either a qualified name or an identifier
                 Debug.assert(node.kind === SyntaxKind.Identifier || node.kind === SyntaxKind.QualifiedName || node.kind === SyntaxKind.PropertyAccessExpression,
                     "'node' was expected to be a qualified name, identifier or property access in 'isPartOfTypeNode'.");
-                // falls through
+            // falls through
             case SyntaxKind.QualifiedName:
             case SyntaxKind.PropertyAccessExpression:
             case SyntaxKind.ThisKeyword: {
@@ -1041,7 +1189,7 @@ namespace ts {
     export function isValidESSymbolDeclaration(node: Node): node is VariableDeclaration | PropertyDeclaration | SignatureDeclaration {
         return isVariableDeclaration(node) ? isConst(node) && isIdentifier(node.name) && isVariableDeclarationInVariableStatement(node) :
             isPropertyDeclaration(node) ? hasReadonlyModifier(node) && hasStaticModifier(node) :
-            isPropertySignature(node) && hasReadonlyModifier(node);
+                isPropertySignature(node) && hasReadonlyModifier(node);
     }
 
     export function introducesArgumentsExoticObject(node: Node) {
@@ -1169,7 +1317,7 @@ namespace ts {
                     if (!includeArrowFunctions) {
                         continue;
                     }
-                    // falls through
+                // falls through
                 case SyntaxKind.FunctionDeclaration:
                 case SyntaxKind.FunctionExpression:
                 case SyntaxKind.ModuleDeclaration:
@@ -1228,7 +1376,7 @@ namespace ts {
                     if (!stopOnFunctions) {
                         continue;
                     }
-                    // falls through
+                // falls through
                 case SyntaxKind.PropertyDeclaration:
                 case SyntaxKind.PropertySignature:
                 case SyntaxKind.MethodDeclaration:
@@ -1435,7 +1583,7 @@ namespace ts {
                 if (node.parent.kind === SyntaxKind.TypeQuery || isJSXTagName(node)) {
                     return true;
                 }
-                // falls through
+            // falls through
             case SyntaxKind.NumericLiteral:
             case SyntaxKind.StringLiteral:
             case SyntaxKind.ThisKeyword:
@@ -1668,7 +1816,7 @@ namespace ts {
     export function isDefaultedJavascriptInitializer(node: BinaryExpression) {
         const name = isVariableDeclaration(node.parent) ? node.parent.name :
             isBinaryExpression(node.parent) && node.parent.operatorToken.kind === SyntaxKind.EqualsToken ? node.parent.left :
-            undefined;
+                undefined;
         return name && getJavascriptInitializer(node.right, isPrototypeAccess(name)) && isEntityNameExpression(name) && isSameEntityName(name, node.left);
     }
 
@@ -1700,10 +1848,10 @@ namespace ts {
         }
         if (isIdentifier(name) && isPropertyAccessExpression(initializer)) {
             return (initializer.expression.kind as SyntaxKind.ThisKeyword === SyntaxKind.ThisKeyword ||
-                    isIdentifier(initializer.expression) &&
-                    (initializer.expression.escapedText === "window" as __String ||
-                     initializer.expression.escapedText === "self" as __String ||
-                     initializer.expression.escapedText === "global" as __String)) &&
+                isIdentifier(initializer.expression) &&
+                (initializer.expression.escapedText === "window" as __String ||
+                    initializer.expression.escapedText === "self" as __String ||
+                    initializer.expression.escapedText === "global" as __String)) &&
                 isSameEntityName(name, initializer.name);
         }
         if (isPropertyAccessExpression(name) && isPropertyAccessExpression(initializer)) {
@@ -2273,7 +2421,7 @@ namespace ts {
     export function getAllSuperTypeNodes(node: Node): ReadonlyArray<TypeNode> {
         return isInterfaceDeclaration(node) ? getInterfaceBaseTypeNodes(node) || emptyArray
             : isClassLike(node) ? concatenate(singleElementArray(getClassExtendsHeritageClauseElement(node)), getClassImplementsHeritageClauseElements(node)) || emptyArray
-            : emptyArray;
+                : emptyArray;
     }
 
     export function getInterfaceBaseTypeNodes(node: InterfaceDeclaration) {
@@ -2358,7 +2506,7 @@ namespace ts {
                 if (node.asteriskToken) {
                     flags |= FunctionFlags.Generator;
                 }
-                // falls through
+            // falls through
             case SyntaxKind.ArrowFunction:
                 if (hasModifier(node, ModifierFlags.Async)) {
                     flags |= FunctionFlags.Async;
@@ -2803,8 +2951,8 @@ namespace ts {
     export function escapeString(s: string, quoteChar?: CharacterCodes.doubleQuote | CharacterCodes.singleQuote | CharacterCodes.backtick): string {
         const escapedCharsRegExp =
             quoteChar === CharacterCodes.backtick ? backtickQuoteEscapedCharsRegExp :
-            quoteChar === CharacterCodes.singleQuote ? singleQuoteEscapedCharsRegExp :
-            doubleQuoteEscapedCharsRegExp;
+                quoteChar === CharacterCodes.singleQuote ? singleQuoteEscapedCharsRegExp :
+                    doubleQuoteEscapedCharsRegExp;
         return s.replace(escapedCharsRegExp, getReplacement);
     }
 
@@ -6435,7 +6583,7 @@ namespace ts {
             case SyntaxKind.JSDocOptionalType:
             case SyntaxKind.JSDocFunctionType:
             case SyntaxKind.JSDocVariadicType:
-            return true;
+                return true;
         }
         return false;
     }
@@ -6504,4 +6652,1405 @@ namespace ts {
     export function isNamedImportsOrExports(node: Node): node is NamedImportsOrExports {
         return node.kind === SyntaxKind.NamedImports || node.kind === SyntaxKind.NamedExports;
     }
-}
+
+    export interface ObjectAllocator {
+        getNodeConstructor(): new (kind: SyntaxKind, pos?: number, end?: number) => Node;
+        getTokenConstructor(): new <TKind extends SyntaxKind>(kind: TKind, pos?: number, end?: number) => Token<TKind>;
+        getIdentifierConstructor(): new (kind: SyntaxKind.Identifier, pos?: number, end?: number) => Identifier;
+        getSourceFileConstructor(): new (kind: SyntaxKind.SourceFile, pos?: number, end?: number) => SourceFile;
+        getSymbolConstructor(): new (flags: SymbolFlags, name: __String) => Symbol;
+        getTypeConstructor(): new (checker: TypeChecker, flags: TypeFlags) => Type;
+        getSignatureConstructor(): new (checker: TypeChecker) => Signature;
+        getSourceMapSourceConstructor(): new (fileName: string, text: string, skipTrivia?: (pos: number) => number) => SourceMapSource;
+    }
+
+    function Symbol(this: Symbol, flags: SymbolFlags, name: __String) {
+        this.flags = flags;
+        this.escapedName = name;
+        this.declarations = undefined!;
+        this.valueDeclaration = undefined!;
+        this.id = undefined;
+        this.mergeId = undefined;
+        this.parent = undefined;
+    }
+
+    function Type(this: Type, checker: TypeChecker, flags: TypeFlags) {
+        this.flags = flags;
+        if (Debug.isDebugging) {
+            this.checker = checker;
+        }
+    }
+
+    function Signature() {} // tslint:disable-line no-empty
+
+    function Node(this: Node, kind: SyntaxKind, pos: number, end: number) {
+        this.pos = pos;
+        this.end = end;
+        this.kind = kind;
+        this.id = 0;
+        this.flags = NodeFlags.None;
+        this.modifierFlagsCache = ModifierFlags.None;
+        this.transformFlags = TransformFlags.None;
+        this.parent = undefined!;
+        this.original = undefined;
+    }
+
+    function SourceMapSource(this: SourceMapSource, fileName: string, text: string, skipTrivia?: (pos: number) => number) {
+        this.fileName = fileName;
+        this.text = text;
+        this.skipTrivia = skipTrivia || (pos => pos);
+    }
+
+    export let objectAllocator: ObjectAllocator = {
+        getNodeConstructor: () => <any>Node,
+        getTokenConstructor: () => <any>Node,
+        getIdentifierConstructor: () => <any>Node,
+        getSourceFileConstructor: () => <any>Node,
+        getSymbolConstructor: () => <any>Symbol,
+        getTypeConstructor: () => <any>Type,
+        getSignatureConstructor: () => <any>Signature,
+        getSourceMapSourceConstructor: () => <any>SourceMapSource,
+    };
+
+    export function formatStringFromArgs(text: string, args: ArrayLike<string>, baseIndex = 0): string {
+        return text.replace(/{(\d+)}/g, (_match, index: string) => Debug.assertDefined(args[+index + baseIndex]));
+    }
+
+    export let localizedDiagnosticMessages: MapLike<string> | undefined;
+
+    export function getLocaleSpecificMessage(message: DiagnosticMessage) {
+        return localizedDiagnosticMessages && localizedDiagnosticMessages[message.key] || message.message;
+    }
+
+    export function createFileDiagnostic(file: SourceFile, start: number, length: number, message: DiagnosticMessage, ...args: (string | number | undefined)[]): DiagnosticWithLocation;
+    export function createFileDiagnostic(file: SourceFile, start: number, length: number, message: DiagnosticMessage): DiagnosticWithLocation {
+        Debug.assertGreaterThanOrEqual(start, 0);
+        Debug.assertGreaterThanOrEqual(length, 0);
+
+        if (file) {
+            Debug.assertLessThanOrEqual(start, file.text.length);
+            Debug.assertLessThanOrEqual(start + length, file.text.length);
+        }
+
+        let text = getLocaleSpecificMessage(message);
+
+        if (arguments.length > 4) {
+            text = formatStringFromArgs(text, arguments, 4);
+        }
+
+        return {
+            file,
+            start,
+            length,
+
+            messageText: text,
+            category: message.category,
+            code: message.code,
+            reportsUnnecessary: message.reportsUnnecessary,
+        };
+    }
+
+    /* @internal */
+    export function formatMessage(_dummy: any, message: DiagnosticMessage): string {
+        let text = getLocaleSpecificMessage(message);
+
+        if (arguments.length > 2) {
+            text = formatStringFromArgs(text, arguments, 2);
+        }
+
+        return text;
+    }
+
+    export function createCompilerDiagnostic(message: DiagnosticMessage, ...args: (string | number | undefined)[]): Diagnostic;
+    export function createCompilerDiagnostic(message: DiagnosticMessage): Diagnostic {
+        let text = getLocaleSpecificMessage(message);
+
+        if (arguments.length > 1) {
+            text = formatStringFromArgs(text, arguments, 1);
+        }
+
+        return {
+            file: undefined,
+            start: undefined,
+            length: undefined,
+
+            messageText: text,
+            category: message.category,
+            code: message.code,
+            reportsUnnecessary: message.reportsUnnecessary,
+        };
+    }
+
+    export function createCompilerDiagnosticFromMessageChain(chain: DiagnosticMessageChain): Diagnostic {
+        return {
+            file: undefined,
+            start: undefined,
+            length: undefined,
+
+            code: chain.code,
+            category: chain.category,
+            messageText: chain.next ? chain : chain.messageText,
+        };
+    }
+
+    export function chainDiagnosticMessages(details: DiagnosticMessageChain | undefined, message: DiagnosticMessage, ...args: (string | undefined)[]): DiagnosticMessageChain;
+    export function chainDiagnosticMessages(details: DiagnosticMessageChain | undefined, message: DiagnosticMessage): DiagnosticMessageChain {
+        let text = getLocaleSpecificMessage(message);
+
+        if (arguments.length > 2) {
+            text = formatStringFromArgs(text, arguments, 2);
+        }
+
+        return {
+            messageText: text,
+            category: message.category,
+            code: message.code,
+
+            next: details
+        };
+    }
+
+    export function concatenateDiagnosticMessageChains(headChain: DiagnosticMessageChain, tailChain: DiagnosticMessageChain): DiagnosticMessageChain {
+        let lastChain = headChain;
+        while (lastChain.next) {
+            lastChain = lastChain.next;
+        }
+
+        lastChain.next = tailChain;
+        return headChain;
+    }    
+
+    function getDiagnosticFilePath(diagnostic: Diagnostic): string | undefined {
+        return diagnostic.file ? diagnostic.file.path : undefined;
+    }
+
+    export function compareDiagnostics(d1: Diagnostic, d2: Diagnostic): Comparison {
+        return compareStringsCaseSensitive(getDiagnosticFilePath(d1), getDiagnosticFilePath(d2)) ||
+            compareValues(d1.start, d2.start) ||
+            compareValues(d1.length, d2.length) ||
+            compareValues(d1.code, d2.code) ||
+            compareMessageText(d1.messageText, d2.messageText) ||
+            Comparison.EqualTo;
+    }
+
+    function compareMessageText(t1: string | DiagnosticMessageChain, t2: string | DiagnosticMessageChain): Comparison {
+        let text1: string | DiagnosticMessageChain | undefined = t1;
+        let text2: string | DiagnosticMessageChain | undefined = t2;
+        while (text1 && text2) {
+            // We still have both chains.
+            const string1 = isString(text1) ? text1 : text1.messageText;
+            const string2 = isString(text2) ? text2 : text2.messageText;
+
+            const res = compareStringsCaseSensitive(string1, string2);
+            if (res) {
+                return res;
+            }
+
+            text1 = isString(text1) ? undefined : text1.next;
+            text2 = isString(text2) ? undefined : text2.next;
+        }
+
+        if (!text1 && !text2) {
+            // if the chains are done, then these messages are the same.
+            return Comparison.EqualTo;
+        }
+
+        // We still have one chain remaining.  The shorter chain should come first.
+        return text1 ? Comparison.GreaterThan : Comparison.LessThan;
+    }
+
+    export function getEmitScriptTarget(compilerOptions: CompilerOptions) {
+        return compilerOptions.target || ScriptTarget.ES3;
+    }
+
+    export function getEmitModuleKind(compilerOptions: {module?: CompilerOptions["module"], target?: CompilerOptions["target"]}) {
+        return typeof compilerOptions.module === "number" ?
+            compilerOptions.module :
+            getEmitScriptTarget(compilerOptions) >= ScriptTarget.ES2015 ? ModuleKind.ES2015 : ModuleKind.CommonJS;
+    }
+
+    export function getEmitModuleResolutionKind(compilerOptions: CompilerOptions) {
+        let moduleResolution = compilerOptions.moduleResolution;
+        if (moduleResolution === undefined) {
+            moduleResolution = getEmitModuleKind(compilerOptions) === ModuleKind.CommonJS ? ModuleResolutionKind.NodeJs : ModuleResolutionKind.Classic;
+        }
+        return moduleResolution;
+    }
+
+    export function unreachableCodeIsError(options: CompilerOptions): boolean {
+        return options.allowUnreachableCode === false;
+    }
+
+    export function unusedLabelIsError(options: CompilerOptions): boolean {
+        return options.allowUnusedLabels === false;
+    }
+
+    export function getAreDeclarationMapsEnabled(options: CompilerOptions) {
+        return !!(options.declaration && options.declarationMap);
+    }
+
+    export function getAllowSyntheticDefaultImports(compilerOptions: CompilerOptions) {
+        const moduleKind = getEmitModuleKind(compilerOptions);
+        return compilerOptions.allowSyntheticDefaultImports !== undefined
+            ? compilerOptions.allowSyntheticDefaultImports
+            : compilerOptions.esModuleInterop
+                ? moduleKind !== ModuleKind.None && moduleKind < ModuleKind.ES2015
+                : moduleKind === ModuleKind.System;
+    }
+
+    export function getEmitDeclarations(compilerOptions: CompilerOptions): boolean {
+        return !!(compilerOptions.declaration || compilerOptions.composite);
+    }
+
+    export type StrictOptionName = "noImplicitAny" | "noImplicitThis" | "strictNullChecks" | "strictFunctionTypes" | "strictPropertyInitialization" | "alwaysStrict";
+
+    export function getStrictOptionValue(compilerOptions: CompilerOptions, flag: StrictOptionName): boolean {
+        return compilerOptions[flag] === undefined ? !!compilerOptions.strict : !!compilerOptions[flag];
+    }
+
+    export function hasZeroOrOneAsteriskCharacter(str: string): boolean {
+        let seenAsterisk = false;
+        for (let i = 0; i < str.length; i++) {
+            if (str.charCodeAt(i) === CharacterCodes.asterisk) {
+                if (!seenAsterisk) {
+                    seenAsterisk = true;
+                }
+                else {
+                    // have already seen asterisk
+                    return false;
+                }
+            }
+        }
+        return true;
+    }
+
+    
+
+    //
+    // Paths
+    //
+
+    /**
+     * Internally, we represent paths as strings with '/' as the directory separator.
+     * When we make system calls (eg: LanguageServiceHost.getDirectory()),
+     * we expect the host to correctly handle paths in our specified format.
+     */
+    export const directorySeparator = "/";
+    const altDirectorySeparator = "\\";
+    const urlSchemeSeparator = "://";
+
+    const backslashRegExp = /\\/g;
+
+    /**
+     * Normalize path separators.
+     */
+    export function normalizeSlashes(path: string): string {
+        return path.replace(backslashRegExp, directorySeparator);
+    }
+
+    function isVolumeCharacter(charCode: number) {
+        return (charCode >= CharacterCodes.a && charCode <= CharacterCodes.z) ||
+            (charCode >= CharacterCodes.A && charCode <= CharacterCodes.Z);
+    }
+
+    function getFileUrlVolumeSeparatorEnd(url: string, start: number) {
+        const ch0 = url.charCodeAt(start);
+        if (ch0 === CharacterCodes.colon) return start + 1;
+        if (ch0 === CharacterCodes.percent && url.charCodeAt(start + 1) === CharacterCodes._3) {
+            const ch2 = url.charCodeAt(start + 2);
+            if (ch2 === CharacterCodes.a || ch2 === CharacterCodes.A) return start + 3;
+        }
+        return -1;
+    }
+
+    /**
+     * Returns length of the root part of a path or URL (i.e. length of "/", "x:/", "//server/share/, file:///user/files").
+     * If the root is part of a URL, the twos-complement of the root length is returned.
+     */
+    function getEncodedRootLength(path: string): number {
+        if (!path) return 0;
+        const ch0 = path.charCodeAt(0);
+
+        // POSIX or UNC
+        if (ch0 === CharacterCodes.slash || ch0 === CharacterCodes.backslash) {
+            if (path.charCodeAt(1) !== ch0) return 1; // POSIX: "/" (or non-normalized "\")
+
+            const p1 = path.indexOf(ch0 === CharacterCodes.slash ? directorySeparator : altDirectorySeparator, 2);
+            if (p1 < 0) return path.length; // UNC: "//server" or "\\server"
+
+            return p1 + 1; // UNC: "//server/" or "\\server\"
+        }
+
+        // DOS
+        if (isVolumeCharacter(ch0) && path.charCodeAt(1) === CharacterCodes.colon) {
+            const ch2 = path.charCodeAt(2);
+            if (ch2 === CharacterCodes.slash || ch2 === CharacterCodes.backslash) return 3; // DOS: "c:/" or "c:\"
+            if (path.length === 2) return 2; // DOS: "c:" (but not "c:d")
+        }
+
+        // URL
+        const schemeEnd = path.indexOf(urlSchemeSeparator);
+        if (schemeEnd !== -1) {
+            const authorityStart = schemeEnd + urlSchemeSeparator.length;
+            const authorityEnd = path.indexOf(directorySeparator, authorityStart);
+            if (authorityEnd !== -1) { // URL: "file:///", "file://server/", "file://server/path"
+                // For local "file" URLs, include the leading DOS volume (if present).
+                // Per https://www.ietf.org/rfc/rfc1738.txt, a host of "" or "localhost" is a
+                // special case interpreted as "the machine from which the URL is being interpreted".
+                const scheme = path.slice(0, schemeEnd);
+                const authority = path.slice(authorityStart, authorityEnd);
+                if (scheme === "file" && (authority === "" || authority === "localhost") &&
+                    isVolumeCharacter(path.charCodeAt(authorityEnd + 1))) {
+                    const volumeSeparatorEnd = getFileUrlVolumeSeparatorEnd(path, authorityEnd + 2);
+                    if (volumeSeparatorEnd !== -1) {
+                        if (path.charCodeAt(volumeSeparatorEnd) === CharacterCodes.slash) {
+                            // URL: "file:///c:/", "file://localhost/c:/", "file:///c%3a/", "file://localhost/c%3a/"
+                            return ~(volumeSeparatorEnd + 1);
+                        }
+                        if (volumeSeparatorEnd === path.length) {
+                            // URL: "file:///c:", "file://localhost/c:", "file:///c$3a", "file://localhost/c%3a"
+                            // but not "file:///c:d" or "file:///c%3ad"
+                            return ~volumeSeparatorEnd;
+                        }
+                    }
+                }
+                return ~(authorityEnd + 1); // URL: "file://server/", "http://server/"
+            }
+            return ~path.length; // URL: "file://server", "http://server"
+        }
+
+        // relative
+        return 0;
+    }
+
+    /**
+     * Returns length of the root part of a path or URL (i.e. length of "/", "x:/", "//server/share/, file:///user/files").
+     *
+     * For example:
+     * ```ts
+     * getRootLength("a") === 0                   // ""
+     * getRootLength("/") === 1                   // "/"
+     * getRootLength("c:") === 2                  // "c:"
+     * getRootLength("c:d") === 0                 // ""
+     * getRootLength("c:/") === 3                 // "c:/"
+     * getRootLength("c:\\") === 3                // "c:\\"
+     * getRootLength("//server") === 7            // "//server"
+     * getRootLength("//server/share") === 8      // "//server/"
+     * getRootLength("\\\\server") === 7          // "\\\\server"
+     * getRootLength("\\\\server\\share") === 8   // "\\\\server\\"
+     * getRootLength("file:///path") === 8        // "file:///"
+     * getRootLength("file:///c:") === 10         // "file:///c:"
+     * getRootLength("file:///c:d") === 8         // "file:///"
+     * getRootLength("file:///c:/path") === 11    // "file:///c:/"
+     * getRootLength("file://server") === 13      // "file://server"
+     * getRootLength("file://server/path") === 14 // "file://server/"
+     * getRootLength("http://server") === 13      // "http://server"
+     * getRootLength("http://server/path") === 14 // "http://server/"
+     * ```
+     */
+    export function getRootLength(path: string) {
+        const rootLength = getEncodedRootLength(path);
+        return rootLength < 0 ? ~rootLength : rootLength;
+    }
+
+    // TODO(rbuckton): replace references with `resolvePath`
+    export function normalizePath(path: string): string {
+        return resolvePath(path);
+    }
+
+    export function normalizePathAndParts(path: string): { path: string, parts: string[] } {
+        path = normalizeSlashes(path);
+        const [root, ...parts] = reducePathComponents(getPathComponents(path));
+        if (parts.length) {
+            const joinedParts = root + parts.join(directorySeparator);
+            return { path: hasTrailingDirectorySeparator(path) ? ensureTrailingDirectorySeparator(joinedParts) : joinedParts, parts };
+        }
+        else {
+            return { path: root, parts };
+        }
+    }
+
+    /**
+     * Returns the path except for its basename. Semantics align with NodeJS's `path.dirname`
+     * except that we support URL's as well.
+     *
+     * ```ts
+     * getDirectoryPath("/path/to/file.ext") === "/path/to"
+     * getDirectoryPath("/path/to/") === "/path"
+     * getDirectoryPath("/") === "/"
+     * ```
+     */
+    export function getDirectoryPath(path: Path): Path;
+    /**
+     * Returns the path except for its basename. Semantics align with NodeJS's `path.dirname`
+     * except that we support URL's as well.
+     *
+     * ```ts
+     * getDirectoryPath("/path/to/file.ext") === "/path/to"
+     * getDirectoryPath("/path/to/") === "/path"
+     * getDirectoryPath("/") === "/"
+     * ```
+     */
+    export function getDirectoryPath(path: string): string;
+    export function getDirectoryPath(path: string): string {
+        path = normalizeSlashes(path);
+
+        // If the path provided is itself the root, then return it.
+        const rootLength = getRootLength(path);
+        if (rootLength === path.length) return path;
+
+        // return the leading portion of the path up to the last (non-terminal) directory separator
+        // but not including any trailing directory separator.
+        path = removeTrailingDirectorySeparator(path);
+        return path.slice(0, Math.max(rootLength, path.lastIndexOf(directorySeparator)));
+    }
+
+    export function isUrl(path: string) {
+        return getEncodedRootLength(path) < 0;
+    }
+
+    export function pathIsRelative(path: string): boolean {
+        return /^\.\.?($|[\\/])/.test(path);
+    }
+
+    /**
+     * Determines whether a path is an absolute path (e.g. starts with `/`, or a dos path
+     * like `c:`, `c:\` or `c:/`).
+     */
+    export function isRootedDiskPath(path: string) {
+        return getEncodedRootLength(path) > 0;
+    }
+
+    /**
+     * Determines whether a path consists only of a path root.
+     */
+    export function isDiskPathRoot(path: string) {
+        const rootLength = getEncodedRootLength(path);
+        return rootLength > 0 && rootLength === path.length;
+    }
+
+    export function convertToRelativePath(absoluteOrRelativePath: string, basePath: string, getCanonicalFileName: (path: string) => string): string {
+        return !isRootedDiskPath(absoluteOrRelativePath)
+            ? absoluteOrRelativePath
+            : getRelativePathToDirectoryOrUrl(basePath, absoluteOrRelativePath, basePath, getCanonicalFileName, /*isAbsolutePathAnUrl*/ false);
+    }
+
+    function pathComponents(path: string, rootLength: number) {
+        const root = path.substring(0, rootLength);
+        const rest = path.substring(rootLength).split(directorySeparator);
+        if (rest.length && !lastOrUndefined(rest)) rest.pop();
+        return [root, ...rest];
+    }
+
+    /**
+     * Parse a path into an array containing a root component (at index 0) and zero or more path
+     * components (at indices > 0). The result is not normalized.
+     * If the path is relative, the root component is `""`.
+     * If the path is absolute, the root component includes the first path separator (`/`).
+     */
+    export function getPathComponents(path: string, currentDirectory = "") {
+        path = combinePaths(currentDirectory, path);
+        const rootLength = getRootLength(path);
+        return pathComponents(path, rootLength);
+    }
+
+    /**
+     * Reduce an array of path components to a more simplified path by navigating any
+     * `"."` or `".."` entries in the path.
+     */
+    export function reducePathComponents(components: ReadonlyArray<string>) {
+        if (!some(components)) return [];
+        const reduced = [components[0]];
+        for (let i = 1; i < components.length; i++) {
+            const component = components[i];
+            if (!component) continue;
+            if (component === ".") continue;
+            if (component === "..") {
+                if (reduced.length > 1) {
+                    if (reduced[reduced.length - 1] !== "..") {
+                        reduced.pop();
+                        continue;
+                    }
+                }
+                else if (reduced[0]) continue;
+            }
+            reduced.push(component);
+        }
+        return reduced;
+    }
+
+    /**
+     * Parse a path into an array containing a root component (at index 0) and zero or more path
+     * components (at indices > 0). The result is normalized.
+     * If the path is relative, the root component is `""`.
+     * If the path is absolute, the root component includes the first path separator (`/`).
+     */
+    export function getNormalizedPathComponents(path: string, currentDirectory: string | undefined) {
+        return reducePathComponents(getPathComponents(path, currentDirectory));
+    }
+
+    export function getNormalizedAbsolutePath(fileName: string, currentDirectory: string | undefined) {
+        return getPathFromPathComponents(getNormalizedPathComponents(fileName, currentDirectory));
+    }
+
+    /**
+     * Formats a parsed path consisting of a root component (at index 0) and zero or more path
+     * segments (at indices > 0).
+     */
+    export function getPathFromPathComponents(pathComponents: ReadonlyArray<string>) {
+        if (pathComponents.length === 0) return "";
+
+        const root = pathComponents[0] && ensureTrailingDirectorySeparator(pathComponents[0]);
+        if (pathComponents.length === 1) return root;
+
+        return root + pathComponents.slice(1).join(directorySeparator);
+    }
+
+    function getPathComponentsRelativeTo(from: string, to: string, stringEqualityComparer: (a: string, b: string) => boolean, getCanonicalFileName: GetCanonicalFileName) {
+        const fromComponents = reducePathComponents(getPathComponents(from));
+        const toComponents = reducePathComponents(getPathComponents(to));
+
+        let start: number;
+        for (start = 0; start < fromComponents.length && start < toComponents.length; start++) {
+            const fromComponent = getCanonicalFileName(fromComponents[start]);
+            const toComponent = getCanonicalFileName(toComponents[start]);
+            const comparer = start === 0 ? equateStringsCaseInsensitive : stringEqualityComparer;
+            if (!comparer(fromComponent, toComponent)) break;
+        }
+
+        if (start === 0) {
+            return toComponents;
+        }
+
+        const components = toComponents.slice(start);
+        const relative: string[] = [];
+        for (; start < fromComponents.length; start++) {
+            relative.push("..");
+        }
+        return ["", ...relative, ...components];
+    }
+
+    export function getRelativePathFromFile(from: string, to: string, getCanonicalFileName: GetCanonicalFileName) {
+        return ensurePathIsNonModuleName(getRelativePathFromDirectory(getDirectoryPath(from), to, getCanonicalFileName));
+    }
+
+    /**
+     * Gets a relative path that can be used to traverse between `from` and `to`.
+     */
+    export function getRelativePathFromDirectory(from: string, to: string, ignoreCase: boolean): string;
+    /**
+     * Gets a relative path that can be used to traverse between `from` and `to`.
+     */
+    // tslint:disable-next-line:unified-signatures
+    export function getRelativePathFromDirectory(fromDirectory: string, to: string, getCanonicalFileName: GetCanonicalFileName): string;
+    export function getRelativePathFromDirectory(fromDirectory: string, to: string, getCanonicalFileNameOrIgnoreCase: GetCanonicalFileName | boolean) {
+        Debug.assert((getRootLength(fromDirectory) > 0) === (getRootLength(to) > 0), "Paths must either both be absolute or both be relative");
+        const getCanonicalFileName = typeof getCanonicalFileNameOrIgnoreCase === "function" ? getCanonicalFileNameOrIgnoreCase : identity;
+        const ignoreCase = typeof getCanonicalFileNameOrIgnoreCase === "boolean" ? getCanonicalFileNameOrIgnoreCase : false;
+        const pathComponents = getPathComponentsRelativeTo(fromDirectory, to, ignoreCase ? equateStringsCaseInsensitive : equateStringsCaseSensitive, getCanonicalFileName);
+        return getPathFromPathComponents(pathComponents);
+    }
+
+    export function getRelativePathToDirectoryOrUrl(directoryPathOrUrl: string, relativeOrAbsolutePath: string, currentDirectory: string, getCanonicalFileName: GetCanonicalFileName, isAbsolutePathAnUrl: boolean) {
+        const pathComponents = getPathComponentsRelativeTo(
+            resolvePath(currentDirectory, directoryPathOrUrl),
+            resolvePath(currentDirectory, relativeOrAbsolutePath),
+            equateStringsCaseSensitive,
+            getCanonicalFileName
+        );
+
+        const firstComponent = pathComponents[0];
+        if (isAbsolutePathAnUrl && isRootedDiskPath(firstComponent)) {
+            const prefix = firstComponent.charAt(0) === directorySeparator ? "file://" : "file:///";
+            pathComponents[0] = prefix + firstComponent;
+        }
+
+        return getPathFromPathComponents(pathComponents);
+    }
+
+    /**
+     * Ensures a path is either absolute (prefixed with `/` or `c:`) or dot-relative (prefixed
+     * with `./` or `../`) so as not to be confused with an unprefixed module name.
+     */
+    export function ensurePathIsNonModuleName(path: string): string {
+        return getRootLength(path) === 0 && !pathIsRelative(path) ? "./" + path : path;
+    }
+
+    /**
+     * Returns the path except for its containing directory name.
+     * Semantics align with NodeJS's `path.basename` except that we support URL's as well.
+     *
+     * ```ts
+     * getBaseFileName("/path/to/file.ext") === "file.ext"
+     * getBaseFileName("/path/to/") === "to"
+     * getBaseFileName("/") === ""
+     * ```
+     */
+    export function getBaseFileName(path: string): string;
+    /**
+     * Gets the portion of a path following the last (non-terminal) separator (`/`).
+     * Semantics align with NodeJS's `path.basename` except that we support URL's as well.
+     * If the base name has any one of the provided extensions, it is removed.
+     *
+     * ```ts
+     * getBaseFileName("/path/to/file.ext", ".ext", true) === "file"
+     * getBaseFileName("/path/to/file.js", ".ext", true) === "file.js"
+     * ```
+     */
+    export function getBaseFileName(path: string, extensions: string | ReadonlyArray<string>, ignoreCase: boolean): string;
+    export function getBaseFileName(path: string, extensions?: string | ReadonlyArray<string>, ignoreCase?: boolean) {
+        path = normalizeSlashes(path);
+
+        // if the path provided is itself the root, then it has not file name.
+        const rootLength = getRootLength(path);
+        if (rootLength === path.length) return "";
+
+        // return the trailing portion of the path starting after the last (non-terminal) directory
+        // separator but not including any trailing directory separator.
+        path = removeTrailingDirectorySeparator(path);
+        const name = path.slice(Math.max(getRootLength(path), path.lastIndexOf(directorySeparator) + 1));
+        const extension = extensions !== undefined && ignoreCase !== undefined ? getAnyExtensionFromPath(name, extensions, ignoreCase) : undefined;
+        return extension ? name.slice(0, name.length - extension.length) : name;
+    }
+
+    /**
+     * Combines paths. If a path is absolute, it replaces any previous path.
+     */
+    export function combinePaths(path: string, ...paths: (string | undefined)[]): string {
+        if (path) path = normalizeSlashes(path);
+        for (let relativePath of paths) {
+            if (!relativePath) continue;
+            relativePath = normalizeSlashes(relativePath);
+            if (!path || getRootLength(relativePath) !== 0) {
+                path = relativePath;
+            }
+            else {
+                path = ensureTrailingDirectorySeparator(path) + relativePath;
+            }
+        }
+        return path;
+    }
+
+    /**
+     * Combines and resolves paths. If a path is absolute, it replaces any previous path. Any
+     * `.` and `..` path components are resolved.
+     */
+    export function resolvePath(path: string, ...paths: (string | undefined)[]): string {
+        const combined = some(paths) ? combinePaths(path, ...paths) : normalizeSlashes(path);
+        const normalized = getPathFromPathComponents(reducePathComponents(getPathComponents(combined)));
+        return normalized && hasTrailingDirectorySeparator(combined) ? ensureTrailingDirectorySeparator(normalized) : normalized;
+    }
+
+    /**
+     * Determines whether a path has a trailing separator (`/` or `\\`).
+     */
+    export function hasTrailingDirectorySeparator(path: string) {
+        if (path.length === 0) return false;
+        const ch = path.charCodeAt(path.length - 1);
+        return ch === CharacterCodes.slash || ch === CharacterCodes.backslash;
+    }
+
+    /**
+     * Removes a trailing directory separator from a path.
+     * @param path The path.
+     */
+    export function removeTrailingDirectorySeparator(path: Path): Path;
+    export function removeTrailingDirectorySeparator(path: string): string;
+    export function removeTrailingDirectorySeparator(path: string) {
+        if (hasTrailingDirectorySeparator(path)) {
+            return path.substr(0, path.length - 1);
+        }
+
+        return path;
+    }
+
+    /**
+     * Adds a trailing directory separator to a path, if it does not already have one.
+     * @param path The path.
+     */
+    export function ensureTrailingDirectorySeparator(path: Path): Path;
+    export function ensureTrailingDirectorySeparator(path: string): string;
+    export function ensureTrailingDirectorySeparator(path: string) {
+        if (!hasTrailingDirectorySeparator(path)) {
+            return path + directorySeparator;
+        }
+
+        return path;
+    }
+
+    function comparePathsWorker(a: string, b: string, componentComparer: (a: string, b: string) => Comparison) {
+        if (a === b) return Comparison.EqualTo;
+        if (a === undefined) return Comparison.LessThan;
+        if (b === undefined) return Comparison.GreaterThan;
+        const aComponents = reducePathComponents(getPathComponents(a));
+        const bComponents = reducePathComponents(getPathComponents(b));
+        const sharedLength = Math.min(aComponents.length, bComponents.length);
+        for (let i = 0; i < sharedLength; i++) {
+            const stringComparer = i === 0 ? compareStringsCaseInsensitive : componentComparer;
+            const result = stringComparer(aComponents[i], bComponents[i]);
+            if (result !== Comparison.EqualTo) {
+                return result;
+            }
+        }
+        return compareValues(aComponents.length, bComponents.length);
+    }
+
+    /**
+     * Performs a case-sensitive comparison of two paths.
+     */
+    export function comparePathsCaseSensitive(a: string, b: string) {
+        return comparePathsWorker(a, b, compareStringsCaseSensitive);
+    }
+
+    /**
+     * Performs a case-insensitive comparison of two paths.
+     */
+    export function comparePathsCaseInsensitive(a: string, b: string) {
+        return comparePathsWorker(a, b, compareStringsCaseInsensitive);
+    }
+
+    export function comparePaths(a: string, b: string, ignoreCase?: boolean): Comparison;
+    export function comparePaths(a: string, b: string, currentDirectory: string, ignoreCase?: boolean): Comparison;
+    export function comparePaths(a: string, b: string, currentDirectory?: string | boolean, ignoreCase?: boolean) {
+        if (typeof currentDirectory === "string") {
+            a = combinePaths(currentDirectory, a);
+            b = combinePaths(currentDirectory, b);
+        }
+        else if (typeof currentDirectory === "boolean") {
+            ignoreCase = currentDirectory;
+        }
+        return comparePathsWorker(a, b, getStringComparer(ignoreCase));
+    }
+
+    export function containsPath(parent: string, child: string, ignoreCase?: boolean): boolean;
+    export function containsPath(parent: string, child: string, currentDirectory: string, ignoreCase?: boolean): boolean;
+    export function containsPath(parent: string, child: string, currentDirectory?: string | boolean, ignoreCase?: boolean) {
+        if (typeof currentDirectory === "string") {
+            parent = combinePaths(currentDirectory, parent);
+            child = combinePaths(currentDirectory, child);
+        }
+        else if (typeof currentDirectory === "boolean") {
+            ignoreCase = currentDirectory;
+        }
+        if (parent === undefined || child === undefined) return false;
+        if (parent === child) return true;
+        const parentComponents = reducePathComponents(getPathComponents(parent));
+        const childComponents = reducePathComponents(getPathComponents(child));
+        if (childComponents.length < parentComponents.length) {
+            return false;
+        }
+
+        const componentEqualityComparer = ignoreCase ? equateStringsCaseInsensitive : equateStringsCaseSensitive;
+        for (let i = 0; i < parentComponents.length; i++) {
+            const equalityComparer = i === 0 ? equateStringsCaseInsensitive : componentEqualityComparer;
+            if (!equalityComparer(parentComponents[i], childComponents[i])) {
+                return false;
+            }
+        }
+
+        return true;
+    }
+
+    export function tryRemoveDirectoryPrefix(path: string, dirPath: string): string | undefined {
+        const a = tryRemovePrefix(path, dirPath);
+        if (a === undefined) return undefined;
+        switch (a.charCodeAt(0)) {
+            case CharacterCodes.slash:
+            case CharacterCodes.backslash:
+                return a.slice(1);
+            default:
+                return undefined;
+        }
+    }
+
+        // Reserved characters, forces escaping of any non-word (or digit), non-whitespace character.
+    // It may be inefficient (we could just match (/[-[\]{}()*+?.,\\^$|#\s]/g), but this is future
+    // proof.
+    const reservedCharacterPattern = /[^\w\s\/]/g;
+    const wildcardCharCodes = [CharacterCodes.asterisk, CharacterCodes.question];
+
+    export function hasExtension(fileName: string): boolean {
+        return stringContains(getBaseFileName(fileName), ".");
+    }
+
+    export const commonPackageFolders: ReadonlyArray<string> = ["node_modules", "bower_components", "jspm_packages"];
+
+    const implicitExcludePathRegexPattern = `(?!(${commonPackageFolders.join("|")})(/|$))`;
+
+    interface WildcardMatcher {
+        singleAsteriskRegexFragment: string;
+        doubleAsteriskRegexFragment: string;
+        replaceWildcardCharacter: (match: string) => string;
+    }
+
+    const filesMatcher: WildcardMatcher = {
+        /**
+         * Matches any single directory segment unless it is the last segment and a .min.js file
+         * Breakdown:
+         *  [^./]                   # matches everything up to the first . character (excluding directory separators)
+         *  (\\.(?!min\\.js$))?     # matches . characters but not if they are part of the .min.js file extension
+         */
+        singleAsteriskRegexFragment: "([^./]|(\\.(?!min\\.js$))?)*",
+        /**
+         * Regex for the ** wildcard. Matches any number of subdirectories. When used for including
+         * files or directories, does not match subdirectories that start with a . character
+         */
+        doubleAsteriskRegexFragment: `(/${implicitExcludePathRegexPattern}[^/.][^/]*)*?`,
+        replaceWildcardCharacter: match => replaceWildcardCharacter(match, filesMatcher.singleAsteriskRegexFragment)
+    };
+
+    const directoriesMatcher: WildcardMatcher = {
+        singleAsteriskRegexFragment: "[^/]*",
+        /**
+         * Regex for the ** wildcard. Matches any number of subdirectories. When used for including
+         * files or directories, does not match subdirectories that start with a . character
+         */
+        doubleAsteriskRegexFragment: `(/${implicitExcludePathRegexPattern}[^/.][^/]*)*?`,
+        replaceWildcardCharacter: match => replaceWildcardCharacter(match, directoriesMatcher.singleAsteriskRegexFragment)
+    };
+
+    const excludeMatcher: WildcardMatcher = {
+        singleAsteriskRegexFragment: "[^/]*",
+        doubleAsteriskRegexFragment: "(/.+?)?",
+        replaceWildcardCharacter: match => replaceWildcardCharacter(match, excludeMatcher.singleAsteriskRegexFragment)
+    };
+
+    const wildcardMatchers = {
+        files: filesMatcher,
+        directories: directoriesMatcher,
+        exclude: excludeMatcher
+    };
+
+    export function getRegularExpressionForWildcard(specs: ReadonlyArray<string> | undefined, basePath: string, usage: "files" | "directories" | "exclude"): string | undefined {
+        const patterns = getRegularExpressionsForWildcards(specs, basePath, usage);
+        if (!patterns || !patterns.length) {
+            return undefined;
+        }
+
+        const pattern = patterns.map(pattern => `(${pattern})`).join("|");
+        // If excluding, match "foo/bar/baz...", but if including, only allow "foo".
+        const terminator = usage === "exclude" ? "($|/)" : "$";
+        return `^(${pattern})${terminator}`;
+    }
+
+    function getRegularExpressionsForWildcards(specs: ReadonlyArray<string> | undefined, basePath: string, usage: "files" | "directories" | "exclude"): string[] | undefined {
+        if (specs === undefined || specs.length === 0) {
+            return undefined;
+        }
+
+        return flatMap(specs, spec =>
+            spec && getSubPatternFromSpec(spec, basePath, usage, wildcardMatchers[usage]));
+    }
+
+    /**
+     * An "includes" path "foo" is implicitly a glob "foo/** /*" (without the space) if its last component has no extension,
+     * and does not contain any glob characters itself.
+     */
+    export function isImplicitGlob(lastPathComponent: string): boolean {
+        return !/[.*?]/.test(lastPathComponent);
+    }
+
+    function getSubPatternFromSpec(spec: string, basePath: string, usage: "files" | "directories" | "exclude", { singleAsteriskRegexFragment, doubleAsteriskRegexFragment, replaceWildcardCharacter }: WildcardMatcher): string | undefined {
+        let subpattern = "";
+        let hasWrittenComponent = false;
+        const components = getNormalizedPathComponents(spec, basePath);
+        const lastComponent = last(components);
+        if (usage !== "exclude" && lastComponent === "**") {
+            return undefined;
+        }
+
+        // getNormalizedPathComponents includes the separator for the root component.
+        // We need to remove to create our regex correctly.
+        components[0] = removeTrailingDirectorySeparator(components[0]);
+
+        if (isImplicitGlob(lastComponent)) {
+            components.push("**", "*");
+        }
+
+        let optionalCount = 0;
+        for (let component of components) {
+            if (component === "**") {
+                subpattern += doubleAsteriskRegexFragment;
+            }
+            else {
+                if (usage === "directories") {
+                    subpattern += "(";
+                    optionalCount++;
+                }
+
+                if (hasWrittenComponent) {
+                    subpattern += directorySeparator;
+                }
+
+                if (usage !== "exclude") {
+                    let componentPattern = "";
+                    // The * and ? wildcards should not match directories or files that start with . if they
+                    // appear first in a component. Dotted directories and files can be included explicitly
+                    // like so: **/.*/.*
+                    if (component.charCodeAt(0) === CharacterCodes.asterisk) {
+                        componentPattern += "([^./]" + singleAsteriskRegexFragment + ")?";
+                        component = component.substr(1);
+                    }
+                    else if (component.charCodeAt(0) === CharacterCodes.question) {
+                        componentPattern += "[^./]";
+                        component = component.substr(1);
+                    }
+
+                    componentPattern += component.replace(reservedCharacterPattern, replaceWildcardCharacter);
+
+                    // Patterns should not include subfolders like node_modules unless they are
+                    // explicitly included as part of the path.
+                    //
+                    // As an optimization, if the component pattern is the same as the component,
+                    // then there definitely were no wildcard characters and we do not need to
+                    // add the exclusion pattern.
+                    if (componentPattern !== component) {
+                        subpattern += implicitExcludePathRegexPattern;
+                    }
+
+                    subpattern += componentPattern;
+                }
+                else {
+                    subpattern += component.replace(reservedCharacterPattern, replaceWildcardCharacter);
+                }
+            }
+
+            hasWrittenComponent = true;
+        }
+
+        while (optionalCount > 0) {
+            subpattern += ")?";
+            optionalCount--;
+        }
+
+        return subpattern;
+    }
+
+    function replaceWildcardCharacter(match: string, singleAsteriskRegexFragment: string) {
+        return match === "*" ? singleAsteriskRegexFragment : match === "?" ? "[^/]" : "\\" + match;
+    }
+
+    export interface FileSystemEntries {
+        readonly files: ReadonlyArray<string>;
+        readonly directories: ReadonlyArray<string>;
+    }
+
+    export interface FileMatcherPatterns {
+        /** One pattern for each "include" spec. */
+        includeFilePatterns: ReadonlyArray<string> | undefined;
+        /** One pattern matching one of any of the "include" specs. */
+        includeFilePattern: string | undefined;
+        includeDirectoryPattern: string | undefined;
+        excludePattern: string | undefined;
+        basePaths: ReadonlyArray<string>;
+    }
+
+    /** @param path directory of the tsconfig.json */
+    export function getFileMatcherPatterns(path: string, excludes: ReadonlyArray<string> | undefined, includes: ReadonlyArray<string> | undefined, useCaseSensitiveFileNames: boolean, currentDirectory: string): FileMatcherPatterns {
+        path = normalizePath(path);
+        currentDirectory = normalizePath(currentDirectory);
+        const absolutePath = combinePaths(currentDirectory, path);
+
+        return {
+            includeFilePatterns: map(getRegularExpressionsForWildcards(includes, absolutePath, "files"), pattern => `^${pattern}$`),
+            includeFilePattern: getRegularExpressionForWildcard(includes, absolutePath, "files"),
+            includeDirectoryPattern: getRegularExpressionForWildcard(includes, absolutePath, "directories"),
+            excludePattern: getRegularExpressionForWildcard(excludes, absolutePath, "exclude"),
+            basePaths: getBasePaths(path, includes, useCaseSensitiveFileNames)
+        };
+    }
+
+    export function getRegexFromPattern(pattern: string, useCaseSensitiveFileNames: boolean): RegExp {
+        return new RegExp(pattern, useCaseSensitiveFileNames ? "" : "i");
+    }
+
+    /** @param path directory of the tsconfig.json */
+    export function matchFiles(path: string, extensions: ReadonlyArray<string> | undefined, excludes: ReadonlyArray<string> | undefined, includes: ReadonlyArray<string> | undefined, useCaseSensitiveFileNames: boolean, currentDirectory: string, depth: number | undefined, getFileSystemEntries: (path: string) => FileSystemEntries): string[] {
+        path = normalizePath(path);
+        currentDirectory = normalizePath(currentDirectory);
+
+        const patterns = getFileMatcherPatterns(path, excludes, includes, useCaseSensitiveFileNames, currentDirectory);
+
+        const includeFileRegexes = patterns.includeFilePatterns && patterns.includeFilePatterns.map(pattern => getRegexFromPattern(pattern, useCaseSensitiveFileNames));
+        const includeDirectoryRegex = patterns.includeDirectoryPattern && getRegexFromPattern(patterns.includeDirectoryPattern, useCaseSensitiveFileNames);
+        const excludeRegex = patterns.excludePattern && getRegexFromPattern(patterns.excludePattern, useCaseSensitiveFileNames);
+
+        // Associate an array of results with each include regex. This keeps results in order of the "include" order.
+        // If there are no "includes", then just put everything in results[0].
+        const results: string[][] = includeFileRegexes ? includeFileRegexes.map(() => []) : [[]];
+
+        for (const basePath of patterns.basePaths) {
+            visitDirectory(basePath, combinePaths(currentDirectory, basePath), depth);
+        }
+
+        return flatten<string>(results);
+
+        function visitDirectory(path: string, absolutePath: string, depth: number | undefined) {
+            const { files, directories } = getFileSystemEntries(path);
+
+            for (const current of sort<string>(files, compareStringsCaseSensitive)) {
+                const name = combinePaths(path, current);
+                const absoluteName = combinePaths(absolutePath, current);
+                if (extensions && !fileExtensionIsOneOf(name, extensions)) continue;
+                if (excludeRegex && excludeRegex.test(absoluteName)) continue;
+                if (!includeFileRegexes) {
+                    results[0].push(name);
+                }
+                else {
+                    const includeIndex = findIndex(includeFileRegexes, re => re.test(absoluteName));
+                    if (includeIndex !== -1) {
+                        results[includeIndex].push(name);
+                    }
+                }
+            }
+
+            if (depth !== undefined) {
+                depth--;
+                if (depth === 0) {
+                    return;
+                }
+            }
+
+            for (const current of sort<string>(directories, compareStringsCaseSensitive)) {
+                const name = combinePaths(path, current);
+                const absoluteName = combinePaths(absolutePath, current);
+                if ((!includeDirectoryRegex || includeDirectoryRegex.test(absoluteName)) &&
+                    (!excludeRegex || !excludeRegex.test(absoluteName))) {
+                    visitDirectory(name, absoluteName, depth);
+                }
+            }
+        }
+    }
+
+    /**
+     * Computes the unique non-wildcard base paths amongst the provided include patterns.
+     */
+    function getBasePaths(path: string, includes: ReadonlyArray<string> | undefined, useCaseSensitiveFileNames: boolean): string[] {
+        // Storage for our results in the form of literal paths (e.g. the paths as written by the user).
+        const basePaths: string[] = [path];
+
+        if (includes) {
+            // Storage for literal base paths amongst the include patterns.
+            const includeBasePaths: string[] = [];
+            for (const include of includes) {
+                // We also need to check the relative paths by converting them to absolute and normalizing
+                // in case they escape the base path (e.g "..\somedirectory")
+                const absolute: string = isRootedDiskPath(include) ? include : normalizePath(combinePaths(path, include));
+                // Append the literal and canonical candidate base paths.
+                includeBasePaths.push(getIncludeBasePath(absolute));
+            }
+
+            // Sort the offsets array using either the literal or canonical path representations.
+            includeBasePaths.sort(getStringComparer(!useCaseSensitiveFileNames));
+
+            // Iterate over each include base path and include unique base paths that are not a
+            // subpath of an existing base path
+            for (const includeBasePath of includeBasePaths) {
+                if (every(basePaths, basePath => !containsPath(basePath, includeBasePath, path, !useCaseSensitiveFileNames))) {
+                    basePaths.push(includeBasePath);
+                }
+            }
+        }
+
+        return basePaths;
+    }
+
+    function getIncludeBasePath(absolute: string): string {
+        const wildcardOffset = indexOfAnyCharCode(absolute, wildcardCharCodes);
+        if (wildcardOffset < 0) {
+            // No "*" or "?" in the path
+            return !hasExtension(absolute)
+                ? absolute
+                : removeTrailingDirectorySeparator(getDirectoryPath(absolute));
+        }
+        return absolute.substring(0, absolute.lastIndexOf(directorySeparator, wildcardOffset));
+    }
+
+    export function ensureScriptKind(fileName: string, scriptKind: ScriptKind | undefined): ScriptKind {
+        // Using scriptKind as a condition handles both:
+        // - 'scriptKind' is unspecified and thus it is `undefined`
+        // - 'scriptKind' is set and it is `Unknown` (0)
+        // If the 'scriptKind' is 'undefined' or 'Unknown' then we attempt
+        // to get the ScriptKind from the file name. If it cannot be resolved
+        // from the file name then the default 'TS' script kind is returned.
+        return scriptKind || getScriptKindFromFileName(fileName) || ScriptKind.TS;
+    }
+
+    export function getScriptKindFromFileName(fileName: string): ScriptKind {
+        const ext = fileName.substr(fileName.lastIndexOf("."));
+        switch (ext.toLowerCase()) {
+            case Extension.Js:
+                return ScriptKind.JS;
+            case Extension.Jsx:
+                return ScriptKind.JSX;
+            case Extension.Ts:
+                return ScriptKind.TS;
+            case Extension.Tsx:
+                return ScriptKind.TSX;
+            case Extension.Json:
+                return ScriptKind.JSON;
+            default:
+                return ScriptKind.Unknown;
+        }
+    }
+
+    /**
+     *  List of supported extensions in order of file resolution precedence.
+     */
+    export const supportedTypeScriptExtensions: ReadonlyArray<Extension> = [Extension.Ts, Extension.Tsx, Extension.Dts];
+    /** Must have ".d.ts" first because if ".ts" goes first, that will be detected as the extension instead of ".d.ts". */
+    export const supportedTypescriptExtensionsForExtractExtension: ReadonlyArray<Extension> = [Extension.Dts, Extension.Ts, Extension.Tsx];
+    export const supportedJavascriptExtensions: ReadonlyArray<Extension> = [Extension.Js, Extension.Jsx];
+    const allSupportedExtensions: ReadonlyArray<Extension> = [...supportedTypeScriptExtensions, ...supportedJavascriptExtensions];
+
+    export function getSupportedExtensions(options?: CompilerOptions, extraFileExtensions?: ReadonlyArray<FileExtensionInfo>): ReadonlyArray<string> {
+        const needJsExtensions = options && options.allowJs;
+
+        if (!extraFileExtensions || extraFileExtensions.length === 0) {
+            return needJsExtensions ? allSupportedExtensions : supportedTypeScriptExtensions;
+        }
+
+        const extensions = [
+            ...needJsExtensions ? allSupportedExtensions : supportedTypeScriptExtensions,
+            ...mapDefined(extraFileExtensions, x => x.scriptKind === ScriptKind.Deferred || needJsExtensions && isJavaScriptLike(x.scriptKind) ? x.extension : undefined)
+        ];
+
+        return deduplicate<string>(extensions, equateStringsCaseSensitive, compareStringsCaseSensitive);
+    }
+
+    function isJavaScriptLike(scriptKind: ScriptKind | undefined): boolean {
+        return scriptKind === ScriptKind.JS || scriptKind === ScriptKind.JSX;
+    }
+
+    export function hasJavaScriptFileExtension(fileName: string): boolean {
+        return some(supportedJavascriptExtensions, extension => fileExtensionIs(fileName, extension));
+    }
+
+    export function hasTypeScriptFileExtension(fileName: string): boolean {
+        return some(supportedTypeScriptExtensions, extension => fileExtensionIs(fileName, extension));
+    }
+
+    export function isSupportedSourceFileName(fileName: string, compilerOptions?: CompilerOptions, extraFileExtensions?: ReadonlyArray<FileExtensionInfo>) {
+        if (!fileName) { return false; }
+
+        for (const extension of getSupportedExtensions(compilerOptions, extraFileExtensions)) {
+            if (fileExtensionIs(fileName, extension)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    /**
+     * Extension boundaries by priority. Lower numbers indicate higher priorities, and are
+     * aligned to the offset of the highest priority extension in the
+     * allSupportedExtensions array.
+     */
+    export const enum ExtensionPriority {
+        TypeScriptFiles = 0,
+        DeclarationAndJavaScriptFiles = 2,
+
+        Highest = TypeScriptFiles,
+        Lowest = DeclarationAndJavaScriptFiles,
+    }
+
+    export function getExtensionPriority(path: string, supportedExtensions: ReadonlyArray<string>): ExtensionPriority {
+        for (let i = supportedExtensions.length - 1; i >= 0; i--) {
+            if (fileExtensionIs(path, supportedExtensions[i])) {
+                return adjustExtensionPriority(<ExtensionPriority>i, supportedExtensions);
+            }
+        }
+
+        // If its not in the list of supported extensions, this is likely a
+        // TypeScript file with a non-ts extension
+        return ExtensionPriority.Highest;
+    }
+
+    /**
+     * Adjusts an extension priority to be the highest priority within the same range.
+     */
+    export function adjustExtensionPriority(extensionPriority: ExtensionPriority, supportedExtensions: ReadonlyArray<string>): ExtensionPriority {
+        if (extensionPriority < ExtensionPriority.DeclarationAndJavaScriptFiles) {
+            return ExtensionPriority.TypeScriptFiles;
+        }
+        else if (extensionPriority < supportedExtensions.length) {
+            return ExtensionPriority.DeclarationAndJavaScriptFiles;
+        }
+        else {
+            return supportedExtensions.length;
+        }
+    }
+
+    /**
+     * Gets the next lowest extension priority for a given priority.
+     */
+    export function getNextLowestExtensionPriority(extensionPriority: ExtensionPriority, supportedExtensions: ReadonlyArray<string>): ExtensionPriority {
+        if (extensionPriority < ExtensionPriority.DeclarationAndJavaScriptFiles) {
+            return ExtensionPriority.DeclarationAndJavaScriptFiles;
+        }
+        else {
+            return supportedExtensions.length;
+        }
+    }
+
+    const extensionsToRemove = [Extension.Dts, Extension.Ts, Extension.Js, Extension.Tsx, Extension.Jsx, Extension.Json];
+    export function removeFileExtension(path: string): string {
+        for (const ext of extensionsToRemove) {
+            const extensionless = tryRemoveExtension(path, ext);
+            if (extensionless !== undefined) {
+                return extensionless;
+            }
+        }
+        return path;
+    }
+
+    export function tryRemoveExtension(path: string, extension: string): string | undefined {
+        return fileExtensionIs(path, extension) ? removeExtension(path, extension) : undefined;
+    }
+
+    export function removeExtension(path: string, extension: string): string {
+        return path.substring(0, path.length - extension.length);
+    }
+
+    export function changeExtension<T extends string | Path>(path: T, newExtension: string): T {
+        return <T>changeAnyExtension(path, newExtension, extensionsToRemove, /*ignoreCase*/ false);
+    }
+
+    export function changeAnyExtension(path: string, ext: string): string;
+    export function changeAnyExtension(path: string, ext: string, extensions: string | ReadonlyArray<string>, ignoreCase: boolean): string;
+    export function changeAnyExtension(path: string, ext: string, extensions?: string | ReadonlyArray<string>, ignoreCase?: boolean) {
+        const pathext = extensions !== undefined && ignoreCase !== undefined ? getAnyExtensionFromPath(path, extensions, ignoreCase) : getAnyExtensionFromPath(path);
+        return pathext ? path.slice(0, path.length - pathext.length) + (startsWith(ext, ".") ? ext : "." + ext) : path;
+    }
+
+    export namespace Debug {
+        export function showSymbol(symbol: Symbol): string {
+            const symbolFlags = (ts as any).SymbolFlags;
+            return `{ flags: ${symbolFlags ? showFlags(symbol.flags, symbolFlags) : symbol.flags}; declarations: ${map(symbol.declarations, showSyntaxKind)} }`;
+        }
+
+        function showFlags(flags: number, flagsEnum: { [flag: number]: string }): string {
+            const out: string[] = [];
+            for (let pow = 0; pow <= 30; pow++) {
+                const n = 1 << pow;
+                if (flags & n) {
+                    out.push(flagsEnum[n]);
+                }
+            }
+            return out.join("|");
+        }
+
+        export function showSyntaxKind(node: Node): string {
+            const syntaxKind = (ts as any).SyntaxKind;
+            return syntaxKind ? syntaxKind[node.kind] : node.kind.toString();
+        }
+    }
+
+    export function tryParsePattern(pattern: string): Pattern | undefined {
+        // This should be verified outside of here and a proper error thrown.
+        Debug.assert(hasZeroOrOneAsteriskCharacter(pattern));
+        const indexOfStar = pattern.indexOf("*");
+        return indexOfStar === -1 ? undefined : {
+            prefix: pattern.substr(0, indexOfStar),
+            suffix: pattern.substr(indexOfStar + 1)
+        };
+    }
+
+    export function positionIsSynthesized(pos: number): boolean {
+        // This is a fast way of testing the following conditions:
+        //  pos === undefined || pos === null || isNaN(pos) || pos < 0;
+        return !(pos >= 0);
+    }
+
+    /** True if an extension is one of the supported TypeScript extensions. */
+    export function extensionIsTypeScript(ext: Extension): boolean {
+        return ext === Extension.Ts || ext === Extension.Tsx || ext === Extension.Dts;
+    }
+
+    export function resolutionExtensionIsTypeScriptOrJson(ext: Extension) {
+        return extensionIsTypeScript(ext) || ext === Extension.Json;
+    }
+
+    /**
+     * Gets the extension from a path.
+     * Path must have a valid extension.
+     */
+    export function extensionFromPath(path: string): Extension {
+        const ext = tryGetExtensionFromPath(path);
+        return ext !== undefined ? ext : Debug.fail(`File ${path} has unknown extension.`);
+    }
+
+    export function isAnySupportedFileExtension(path: string): boolean {
+        return tryGetExtensionFromPath(path) !== undefined;
+    }
+
+    export function tryGetExtensionFromPath(path: string): Extension | undefined {
+        return find<Extension>(supportedTypescriptExtensionsForExtractExtension, e => fileExtensionIs(path, e)) || find(supportedJavascriptExtensions, e => fileExtensionIs(path, e));
+    }
+
+    function getAnyExtensionFromPathWorker(path: string, extensions: string | ReadonlyArray<string>, stringEqualityComparer: (a: string, b: string) => boolean) {
+        if (typeof extensions === "string") extensions = [extensions];
+        for (let extension of extensions) {
+            if (!startsWith(extension, ".")) extension = "." + extension;
+            if (path.length >= extension.length && path.charAt(path.length - extension.length) === ".") {
+                const pathExtension = path.slice(path.length - extension.length);
+                if (stringEqualityComparer(pathExtension, extension)) {
+                    return pathExtension;
+                }
+            }
+        }
+        return "";
+    }
+
+    /**
+     * Gets the file extension for a path.
+     */
+    export function getAnyExtensionFromPath(path: string): string;
+    /**
+     * Gets the file extension for a path, provided it is one of the provided extensions.
+     */
+    export function getAnyExtensionFromPath(path: string, extensions: string | ReadonlyArray<string>, ignoreCase: boolean): string;
+    export function getAnyExtensionFromPath(path: string, extensions?: string | ReadonlyArray<string>, ignoreCase?: boolean): string {
+        // Retrieves any string from the final "." onwards from a base file name.
+        // Unlike extensionFromPath, which throws an exception on unrecognized extensions.
+        if (extensions) {
+            return getAnyExtensionFromPathWorker(path, extensions, ignoreCase ? equateStringsCaseInsensitive : equateStringsCaseSensitive);
+        }
+        const baseFileName = getBaseFileName(path);
+        const extensionIndex = baseFileName.lastIndexOf(".");
+        if (extensionIndex >= 0) {
+            return baseFileName.substring(extensionIndex);
+        }
+        return "";
+    }
+
+    export function isCheckJsEnabledForFile(sourceFile: SourceFile, compilerOptions: CompilerOptions) {
+        return sourceFile.checkJsDirective ? sourceFile.checkJsDirective.enabled : compilerOptions.checkJs;
+    }
+
+    export const emptyFileSystemEntries: FileSystemEntries = {
+        files: emptyArray,
+        directories: emptyArray
+    };
+
+
+    /**
+     * patternStrings contains both pattern strings (containing "*") and regular strings.
+     * Return an exact match if possible, or a pattern match, or undefined.
+     * (These are verified by verifyCompilerOptions to have 0 or 1 "*" characters.)
+     */
+    export function matchPatternOrExact(patternStrings: ReadonlyArray<string>, candidate: string): string | Pattern | undefined {
+        const patterns: Pattern[] = [];
+        for (const patternString of patternStrings) {
+            const pattern = tryParsePattern(patternString);
+            if (pattern) {
+                patterns.push(pattern);
+            }
+            else if (patternString === candidate) {
+                // pattern was matched as is - no need to search further
+                return patternString;
+            }
+        }
+
+        return findBestPatternMatch(patterns, _ => _, candidate);
+    }}
diff --git a/src/server/tsconfig.json b/src/server/tsconfig.json
index cb0485321ca..5339673cb9e 100644
--- a/src/server/tsconfig.json
+++ b/src/server/tsconfig.json
@@ -2,130 +2,19 @@
     "extends": "../tsconfig-base",
     "compilerOptions": {
         "removeComments": true,
-        "outFile": "../../built/local/tsserver.js",
+        "outFile": "../../built/local/tsserverlibrary.js",
         "preserveConstEnums": true,
         "types": [
             "node"
         ]
     },
+    "references": [
+        { "path": "../core" },
+        { "path": "../parser" },
+        { "path": "../compiler" },
+        { "path": "../services" }
+    ],
     "files": [
-        "../compiler/types.ts",
-        "../compiler/performance.ts",
-        "../compiler/core.ts",
-        "../compiler/sys.ts",
-        "../compiler/diagnosticInformationMap.generated.ts",
-        "../compiler/scanner.ts",
-        "../compiler/utilities.ts",
-        "../compiler/parser.ts",
-        "../compiler/binder.ts",
-        "../compiler/symbolWalker.ts",
-        "../compiler/moduleNameResolver.ts",
-        "../compiler/checker.ts",
-        "../compiler/factory.ts",
-        "../compiler/visitor.ts",
-        "../compiler/transformers/utilities.ts",
-        "../compiler/transformers/destructuring.ts",
-        "../compiler/transformers/ts.ts",
-        "../compiler/transformers/es2017.ts",
-        "../compiler/transformers/esnext.ts",
-        "../compiler/transformers/jsx.ts",
-        "../compiler/transformers/es2016.ts",
-        "../compiler/transformers/es2015.ts",
-        "../compiler/transformers/es5.ts",
-        "../compiler/transformers/generators.ts",
-        "../compiler/transformers/module/module.ts",
-        "../compiler/transformers/module/system.ts",
-        "../compiler/transformers/module/es2015.ts",
-        "../compiler/transformers/declarations/diagnostics.ts",
-        "../compiler/transformers/declarations.ts",
-        "../compiler/transformer.ts",
-        "../compiler/sourcemap.ts",
-        "../compiler/comments.ts",
-        "../compiler/emitter.ts",
-        "../compiler/watchUtilities.ts",
-        "../compiler/program.ts",
-        "../compiler/builderState.ts",
-        "../compiler/builder.ts",
-        "../compiler/resolutionCache.ts",
-        "../compiler/moduleSpecifiers.ts",
-        "../compiler/watch.ts",
-        "../compiler/commandLineParser.ts",
-
-        "../services/types.ts",
-        "../services/utilities.ts",
-        "../services/classifier.ts",
-        "../services/pathCompletions.ts",
-        "../services/completions.ts",
-        "../services/documentHighlights.ts",
-        "../services/documentRegistry.ts",
-        "../services/importTracker.ts",
-        "../services/findAllReferences.ts",
-        "../services/getEditsForFileRename.ts",
-        "../services/goToDefinition.ts",
-        "../services/jsDoc.ts",
-        "../services/semver.ts",
-        "../services/jsTyping.ts",
-        "../services/navigateTo.ts",
-        "../services/navigationBar.ts",
-        "../services/organizeImports.ts",
-        "../services/getEditsForFileRename.ts",
-        "../services/outliningElementsCollector.ts",
-        "../services/patternMatcher.ts",
-        "../services/preProcess.ts",
-        "../services/rename.ts",
-        "../services/signatureHelp.ts",
-        "../services/suggestionDiagnostics.ts",
-        "../services/symbolDisplay.ts",
-        "../services/transpile.ts",
-        "../services/formatting/formattingContext.ts",
-        "../services/formatting/formattingScanner.ts",
-        "../services/formatting/rule.ts",
-        "../services/formatting/rules.ts",
-        "../services/formatting/rulesMap.ts",
-        "../services/formatting/formatting.ts",
-        "../services/formatting/smartIndenter.ts",
-        "../services/textChanges.ts",
-        "../services/codeFixProvider.ts",
-        "../services/refactorProvider.ts",
-        "../services/codefixes/addMissingInvocationForDecorator.ts",
-        "../services/codefixes/annotateWithTypeFromJSDoc.ts",
-        "../services/codefixes/convertFunctionToEs6Class.ts",
-        "../services/codefixes/convertToEs6Module.ts",
-        "../services/codefixes/correctQualifiedNameToIndexedAccessType.ts",
-        "../services/codefixes/fixClassIncorrectlyImplementsInterface.ts",
-        "../services/codefixes/importFixes.ts",
-        "../services/codefixes/fixSpelling.ts",
-        "../services/codefixes/fixAddMissingMember.ts",
-        "../services/codefixes/fixCannotFindModule.ts",
-        "../services/codefixes/fixClassDoesntImplementInheritedAbstractMember.ts",
-        "../services/codefixes/fixClassSuperMustPrecedeThisAccess.ts",
-        "../services/codefixes/fixConstructorForDerivedNeedSuperCall.ts",
-        "../services/codefixes/fixExtendsInterfaceBecomesImplements.ts",
-        "../services/codefixes/fixForgottenThisPropertyAccess.ts",
-        "../services/codefixes/fixUnusedIdentifier.ts",
-        "../services/codefixes/fixUnreachableCode.ts",
-        "../services/codefixes/fixUnusedLabel.ts",
-        "../services/codefixes/fixJSDocTypes.ts",
-        "../services/codefixes/fixAwaitInSyncFunction.ts",
-        "../services/codefixes/disableJsDiagnostics.ts",
-        "../services/codefixes/helpers.ts",
-        "../services/codefixes/inferFromUsage.ts",
-        "../services/codefixes/fixInvalidImportSyntax.ts",
-        "../services/codefixes/fixStrictClassInitialization.ts",
-        "../services/codefixes/requireInTs.ts",
-        "../services/codefixes/useDefaultImport.ts",
-        "../services/codefixes/fixAddModuleReferTypeMissingTypeof.ts",
-        "../services/codefixes/convertToMappedObjectType.ts",
-        "../services/refactors/convertImport.ts",
-        "../services/refactors/extractSymbol.ts",
-        "../services/refactors/generateGetAccessorAndSetAccessor.ts",
-        "../services/refactors/moveToNewFile.ts",
-        "../services/sourcemaps.ts",
-        "../services/services.ts",
-        "../services/breakpoints.ts",
-        "../services/transform.ts",
-        "../services/shims.ts",
-
         "types.ts",
         "shared.ts",
         "utilities.ts",
@@ -135,7 +24,6 @@
         "project.ts",
         "editorServices.ts",
         "session.ts",
-        "scriptVersionCache.ts",
-        "server.ts"
+        "scriptVersionCache.ts"
     ]
 }
diff --git a/src/server/tsconfig.library.json b/src/server/tsconfig.library.json
deleted file mode 100644
index 1adfe2a4bd0..00000000000
--- a/src/server/tsconfig.library.json
+++ /dev/null
@@ -1,146 +0,0 @@
-{
-    "compilerOptions": {
-        "noImplicitAny": true,
-        "noImplicitThis": true,
-        "alwaysStrict": true,
-        "preserveConstEnums": true,
-        "pretty": true,
-        "outFile": "../../built/local/tsserverlibrary.js",
-        "sourceMap": true,
-        "stripInternal": true,
-        "target": "es5",
-        "noUnusedLocals": true,
-        "noUnusedParameters": true,
-        "declaration": true,
-        "types": []
-    },
-    "files": [
-        "../compiler/types.ts",
-        "../compiler/performance.ts",
-        "../compiler/core.ts",
-        "../compiler/sys.ts",
-        "../compiler/diagnosticInformationMap.generated.ts",
-        "../compiler/scanner.ts",
-        "../compiler/utilities.ts",
-        "../compiler/parser.ts",
-        "../compiler/binder.ts",
-        "../compiler/symbolWalker.ts",
-        "../compiler/moduleNameResolver.ts",
-        "../compiler/checker.ts",
-        "../compiler/factory.ts",
-        "../compiler/visitor.ts",
-        "../compiler/transformers/utilities.ts",
-        "../compiler/transformers/destructuring.ts",
-        "../compiler/transformers/ts.ts",
-        "../compiler/transformers/es2017.ts",
-        "../compiler/transformers/esnext.ts",
-        "../compiler/transformers/jsx.ts",
-        "../compiler/transformers/es2016.ts",
-        "../compiler/transformers/es2015.ts",
-        "../compiler/transformers/es5.ts",
-        "../compiler/transformers/generators.ts",
-        "../compiler/transformers/module/module.ts",
-        "../compiler/transformers/module/system.ts",
-        "../compiler/transformers/module/es2015.ts",
-        "../compiler/transformers/declarations/diagnostics.ts",
-        "../compiler/transformers/declarations.ts",
-        "../compiler/transformer.ts",
-        "../compiler/sourcemap.ts",
-        "../compiler/comments.ts",
-        "../compiler/emitter.ts",
-        "../compiler/watchUtilities.ts",
-        "../compiler/program.ts",
-        "../compiler/builderState.ts",
-        "../compiler/builder.ts",
-        "../compiler/resolutionCache.ts",
-        "../compiler/moduleSpecifiers.ts",
-        "../compiler/watch.ts",
-        "../compiler/commandLineParser.ts",
-
-        "../services/types.ts",
-        "../services/utilities.ts",
-        "../services/classifier.ts",
-        "../services/pathCompletions.ts",
-        "../services/completions.ts",
-        "../services/documentHighlights.ts",
-        "../services/documentRegistry.ts",
-        "../services/importTracker.ts",
-        "../services/findAllReferences.ts",
-        "../services/getEditsForFileRename.ts",
-        "../services/goToDefinition.ts",
-        "../services/jsDoc.ts",
-        "../services/semver.ts",
-        "../services/jsTyping.ts",
-        "../services/navigateTo.ts",
-        "../services/navigationBar.ts",
-        "../services/organizeImports.ts",
-        "../services/getEditsForFileRename.ts",
-        "../services/outliningElementsCollector.ts",
-        "../services/patternMatcher.ts",
-        "../services/preProcess.ts",
-        "../services/rename.ts",
-        "../services/signatureHelp.ts",
-        "../services/suggestionDiagnostics.ts",
-        "../services/symbolDisplay.ts",
-        "../services/transpile.ts",
-        "../services/formatting/formattingContext.ts",
-        "../services/formatting/formattingScanner.ts",
-        "../services/formatting/rule.ts",
-        "../services/formatting/rules.ts",
-        "../services/formatting/rulesMap.ts",
-        "../services/formatting/formatting.ts",
-        "../services/formatting/smartIndenter.ts",
-        "../services/textChanges.ts",
-        "../services/codeFixProvider.ts",
-        "../services/refactorProvider.ts",
-        "../services/codefixes/addMissingInvocationForDecorator.ts",
-        "../services/codefixes/annotateWithTypeFromJSDoc.ts",
-        "../services/codefixes/convertFunctionToEs6Class.ts",
-        "../services/codefixes/convertToEs6Module.ts",
-        "../services/codefixes/correctQualifiedNameToIndexedAccessType.ts",
-        "../services/codefixes/fixClassIncorrectlyImplementsInterface.ts",
-        "../services/codefixes/importFixes.ts",
-        "../services/codefixes/fixSpelling.ts",
-        "../services/codefixes/fixAddMissingMember.ts",
-        "../services/codefixes/fixCannotFindModule.ts",
-        "../services/codefixes/fixClassDoesntImplementInheritedAbstractMember.ts",
-        "../services/codefixes/fixClassSuperMustPrecedeThisAccess.ts",
-        "../services/codefixes/fixConstructorForDerivedNeedSuperCall.ts",
-        "../services/codefixes/fixExtendsInterfaceBecomesImplements.ts",
-        "../services/codefixes/fixForgottenThisPropertyAccess.ts",
-        "../services/codefixes/fixUnusedIdentifier.ts",
-        "../services/codefixes/fixUnreachableCode.ts",
-        "../services/codefixes/fixUnusedLabel.ts",
-        "../services/codefixes/fixJSDocTypes.ts",
-        "../services/codefixes/fixAwaitInSyncFunction.ts",
-        "../services/codefixes/disableJsDiagnostics.ts",
-        "../services/codefixes/helpers.ts",
-        "../services/codefixes/inferFromUsage.ts",
-        "../services/codefixes/fixInvalidImportSyntax.ts",
-        "../services/codefixes/fixStrictClassInitialization.ts",
-        "../services/codefixes/requireInTs.ts",
-        "../services/codefixes/useDefaultImport.ts",
-        "../services/codefixes/fixAddModuleReferTypeMissingTypeof.ts",
-        "../services/codefixes/convertToMappedObjectType.ts",
-        "../services/refactors/convertImport.ts",
-        "../services/refactors/extractSymbol.ts",
-        "../services/refactors/generateGetAccessorAndSetAccessor.ts",
-        "../services/refactors/moveToNewFile.ts",
-        "../services/sourcemaps.ts",
-        "../services/services.ts",
-        "../services/breakpoints.ts",
-        "../services/transform.ts",
-        "../services/shims.ts",
-
-        "types.ts",
-        "shared.ts",
-        "utilities.ts",
-        "protocol.ts",
-        "scriptInfo.ts",
-        "typingsCache.ts",
-        "project.ts",
-        "editorServices.ts",
-        "session.ts",
-        "scriptVersionCache.ts"
-    ]
-}
diff --git a/src/server/typingsInstaller/tsconfig.json b/src/server/typingsInstaller/tsconfig.json
deleted file mode 100644
index 1606fbf3592..00000000000
--- a/src/server/typingsInstaller/tsconfig.json
+++ /dev/null
@@ -1,32 +0,0 @@
-{
-    "extends": "../../tsconfig-base",
-    "compilerOptions": {
-        "removeComments": true,
-        "outFile": "../../../built/local/typingsInstaller.js",
-        "types": [
-            "node"
-        ],
-        "lib": [
-            "es6",
-            "scripthost"
-        ]
-    },
-    "files": [
-        "../../compiler/types.ts",
-        "../../compiler/performance.ts",
-        "../../compiler/core.ts",
-        "../../compiler/sys.ts",
-        "../../compiler/diagnosticInformationMap.generated.ts",
-        "../../compiler/utilities.ts",
-        "../../compiler/scanner.ts",
-        "../../compiler/parser.ts",
-        "../../compiler/commandLineParser.ts",
-        "../../compiler/moduleNameResolver.ts",
-        "../../services/semver.ts",
-        "../../services/jsTyping.ts",
-        "../types.ts",
-        "../shared.ts",
-        "typingsInstaller.ts",
-        "nodeTypingsInstaller.ts"
-    ]
-}
diff --git a/src/services/tsconfig.json b/src/services/tsconfig.json
index 237142fc5bf..7b0b5bc6bc6 100644
--- a/src/services/tsconfig.json
+++ b/src/services/tsconfig.json
@@ -1,53 +1,14 @@
 {
     "extends": "../tsconfig-base",
     "compilerOptions": {
-        "removeComments": false,
-        "outFile": "../../built/local/typescriptServices.js",
-        "declaration": true
+        "outFile": "../../built/local/typescriptServices.js"
     },
+    "references": [
+        { "path": "../core" },
+        { "path": "../parser" },
+        { "path": "../compiler" }
+    ],
     "files": [
-        "../compiler/types.ts",
-        "../compiler/performance.ts",
-        "../compiler/core.ts",
-        "../compiler/sys.ts",
-        "../compiler/diagnosticInformationMap.generated.ts",
-        "../compiler/scanner.ts",
-        "../compiler/utilities.ts",
-        "../compiler/parser.ts",
-        "../compiler/binder.ts",
-        "../compiler/symbolWalker.ts",
-        "../compiler/moduleNameResolver.ts",
-        "../compiler/checker.ts",
-        "../compiler/factory.ts",
-        "../compiler/visitor.ts",
-        "../compiler/transformers/utilities.ts",
-        "../compiler/transformers/destructuring.ts",
-        "../compiler/transformers/ts.ts",
-        "../compiler/transformers/es2017.ts",
-        "../compiler/transformers/esnext.ts",
-        "../compiler/transformers/jsx.ts",
-        "../compiler/transformers/es2016.ts",
-        "../compiler/transformers/es2015.ts",
-        "../compiler/transformers/es5.ts",
-        "../compiler/transformers/generators.ts",
-        "../compiler/transformers/module/module.ts",
-        "../compiler/transformers/module/system.ts",
-        "../compiler/transformers/module/es2015.ts",
-        "../compiler/transformers/declarations/diagnostics.ts",
-        "../compiler/transformers/declarations.ts",
-        "../compiler/transformer.ts",
-        "../compiler/sourcemap.ts",
-        "../compiler/comments.ts",
-        "../compiler/emitter.ts",
-        "../compiler/watchUtilities.ts",
-        "../compiler/program.ts",
-        "../compiler/builderState.ts",
-        "../compiler/builder.ts",
-        "../compiler/resolutionCache.ts",
-        "../compiler/moduleSpecifiers.ts",
-        "../compiler/watch.ts",
-        "../compiler/commandLineParser.ts",
-
         "types.ts",
         "utilities.ts",
         "classifier.ts",
diff --git a/src/harness/compilerRunner.ts b/src/testRunner/compilerRunner.ts
similarity index 95%
rename from src/harness/compilerRunner.ts
rename to src/testRunner/compilerRunner.ts
index 99191b66c26..fc295c80f2e 100644
--- a/src/harness/compilerRunner.ts
+++ b/src/testRunner/compilerRunner.ts
@@ -1,11 +1,3 @@
-/// <reference path="harness.ts" />
-/// <reference path="runnerbase.ts" />
-/// <reference path="typeWriter.ts" />
-/// <reference path="./vpath.ts" />
-/// <reference path="./vfs.ts" />
-/// <reference path="./compiler.ts" />
-/// <reference path="./documents.ts" />
-
 const enum CompilerTestType {
     Conformance,
     Regressions,
diff --git a/src/harness/externalCompileRunner.ts b/src/testRunner/externalCompileRunner.ts
similarity index 97%
rename from src/harness/externalCompileRunner.ts
rename to src/testRunner/externalCompileRunner.ts
index 2e24400fed5..898dccf54ea 100644
--- a/src/harness/externalCompileRunner.ts
+++ b/src/testRunner/externalCompileRunner.ts
@@ -1,5 +1,3 @@
-/// <reference path="harness.ts"/>
-/// <reference path="runnerbase.ts" />
 const fs = require("fs");
 const path = require("path");
 const del = require("del");
diff --git a/src/harness/fourslashRunner.ts b/src/testRunner/fourslashRunner.ts
similarity index 79%
rename from src/harness/fourslashRunner.ts
rename to src/testRunner/fourslashRunner.ts
index d0ad139205a..583311ba30e 100644
--- a/src/harness/fourslashRunner.ts
+++ b/src/testRunner/fourslashRunner.ts
@@ -1,34 +1,23 @@
-///<reference path="fourslash.ts" />
-///<reference path="harness.ts"/>
-///<reference path="runnerbase.ts" />
-
-const enum FourSlashTestType {
-    Native,
-    Shims,
-    ShimsWithPreprocess,
-    Server
-}
-
 class FourSlashRunner extends RunnerBase {
     protected basePath: string;
     protected testSuiteName: TestRunnerKind;
 
-    constructor(private testType: FourSlashTestType) {
+    constructor(private testType: FourSlash.FourSlashTestType) {
         super();
         switch (testType) {
-            case FourSlashTestType.Native:
+            case FourSlash.FourSlashTestType.Native:
                 this.basePath = "tests/cases/fourslash";
                 this.testSuiteName = "fourslash";
                 break;
-            case FourSlashTestType.Shims:
+            case FourSlash.FourSlashTestType.Shims:
                 this.basePath = "tests/cases/fourslash/shims";
                 this.testSuiteName = "fourslash-shims";
                 break;
-            case FourSlashTestType.ShimsWithPreprocess:
+            case FourSlash.FourSlashTestType.ShimsWithPreprocess:
                 this.basePath = "tests/cases/fourslash/shims-pp";
                 this.testSuiteName = "fourslash-shims-pp";
                 break;
-            case FourSlashTestType.Server:
+            case FourSlash.FourSlashTestType.Server:
                 this.basePath = "tests/cases/fourslash/server";
                 this.testSuiteName = "fourslash-server";
                 break;
@@ -72,7 +61,7 @@ class FourSlashRunner extends RunnerBase {
 }
 
 class GeneratedFourslashRunner extends FourSlashRunner {
-    constructor(testType: FourSlashTestType) {
+    constructor(testType: FourSlash.FourSlashTestType) {
         super(testType);
         this.basePath += "/generated/";
     }
diff --git a/src/harness/parallel/host.ts b/src/testRunner/parallel/host.ts
similarity index 100%
rename from src/harness/parallel/host.ts
rename to src/testRunner/parallel/host.ts
diff --git a/src/harness/parallel/shared.ts b/src/testRunner/parallel/shared.ts
similarity index 100%
rename from src/harness/parallel/shared.ts
rename to src/testRunner/parallel/shared.ts
diff --git a/src/harness/parallel/worker.ts b/src/testRunner/parallel/worker.ts
similarity index 100%
rename from src/harness/parallel/worker.ts
rename to src/testRunner/parallel/worker.ts
diff --git a/src/harness/projectsRunner.ts b/src/testRunner/projectsRunner.ts
similarity index 97%
rename from src/harness/projectsRunner.ts
rename to src/testRunner/projectsRunner.ts
index a12da7a268f..f3b4a0bca23 100644
--- a/src/harness/projectsRunner.ts
+++ b/src/testRunner/projectsRunner.ts
@@ -1,11 +1,3 @@
-/// <reference path="harness.ts" />
-/// <reference path="runnerbase.ts" />
-/// <reference path="./vpath.ts" />
-/// <reference path="./vfs.ts" />
-/// <reference path="./documents.ts" />
-/// <reference path="./compiler.ts" />
-/// <reference path="./fakes.ts" />
-
 namespace project {
     // Test case is json of below type in tests/cases/project/
     interface ProjectRunnerTestCase {
diff --git a/src/harness/runner.ts b/src/testRunner/runner.ts
similarity index 80%
rename from src/harness/runner.ts
rename to src/testRunner/runner.ts
index 9fe48b559f2..d66360458a8 100644
--- a/src/harness/runner.ts
+++ b/src/testRunner/runner.ts
@@ -1,27 +1,3 @@
-//
-// Copyright (c) Microsoft Corporation.  All rights reserved.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//   http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-//
-
-/// <reference path="test262Runner.ts" />
-/// <reference path="compilerRunner.ts" />
-/// <reference path="fourslashRunner.ts" />
-/// <reference path="projectsRunner.ts" />
-/// <reference path="rwcRunner.ts" />
-/// <reference path="externalCompileRunner.ts" />
-/// <reference path="harness.ts" />
-/// <reference path="./parallel/shared.ts" />
-
 let runners: RunnerBase[] = [];
 let iterations = 1;
 
@@ -47,13 +23,13 @@ function createRunner(kind: TestRunnerKind): RunnerBase {
         case "compiler":
             return new CompilerBaselineRunner(CompilerTestType.Regressions);
         case "fourslash":
-            return new FourSlashRunner(FourSlashTestType.Native);
+            return new FourSlashRunner(FourSlash.FourSlashTestType.Native);
         case "fourslash-shims":
-            return new FourSlashRunner(FourSlashTestType.Shims);
+            return new FourSlashRunner(FourSlash.FourSlashTestType.Shims);
         case "fourslash-shims-pp":
-            return new FourSlashRunner(FourSlashTestType.ShimsWithPreprocess);
+            return new FourSlashRunner(FourSlash.FourSlashTestType.ShimsWithPreprocess);
         case "fourslash-server":
-            return new FourSlashRunner(FourSlashTestType.Server);
+            return new FourSlashRunner(FourSlash.FourSlashTestType.Server);
         case "project":
             return new project.ProjectRunner();
         case "rwc":
@@ -166,19 +142,19 @@ function handleTestConfig() {
                         runners.push(new project.ProjectRunner());
                         break;
                     case "fourslash":
-                        runners.push(new FourSlashRunner(FourSlashTestType.Native));
+                        runners.push(new FourSlashRunner(FourSlash.FourSlashTestType.Native));
                         break;
                     case "fourslash-shims":
-                        runners.push(new FourSlashRunner(FourSlashTestType.Shims));
+                        runners.push(new FourSlashRunner(FourSlash.FourSlashTestType.Shims));
                         break;
                     case "fourslash-shims-pp":
-                        runners.push(new FourSlashRunner(FourSlashTestType.ShimsWithPreprocess));
+                        runners.push(new FourSlashRunner(FourSlash.FourSlashTestType.ShimsWithPreprocess));
                         break;
                     case "fourslash-server":
-                        runners.push(new FourSlashRunner(FourSlashTestType.Server));
+                        runners.push(new FourSlashRunner(FourSlash.FourSlashTestType.Server));
                         break;
                     case "fourslash-generated":
-                        runners.push(new GeneratedFourslashRunner(FourSlashTestType.Native));
+                        runners.push(new GeneratedFourslashRunner(FourSlash.FourSlashTestType.Native));
                         break;
                     case "rwc":
                         runners.push(new RWCRunner());
@@ -208,10 +184,10 @@ function handleTestConfig() {
         }
 
         // language services
-        runners.push(new FourSlashRunner(FourSlashTestType.Native));
-        runners.push(new FourSlashRunner(FourSlashTestType.Shims));
-        runners.push(new FourSlashRunner(FourSlashTestType.ShimsWithPreprocess));
-        runners.push(new FourSlashRunner(FourSlashTestType.Server));
+        runners.push(new FourSlashRunner(FourSlash.FourSlashTestType.Native));
+        runners.push(new FourSlashRunner(FourSlash.FourSlashTestType.Shims));
+        runners.push(new FourSlashRunner(FourSlash.FourSlashTestType.ShimsWithPreprocess));
+        runners.push(new FourSlashRunner(FourSlash.FourSlashTestType.Server));
         // runners.push(new GeneratedFourslashRunner());
 
         // CRON-only tests
diff --git a/src/harness/rwcRunner.ts b/src/testRunner/rwcRunner.ts
similarity index 96%
rename from src/harness/rwcRunner.ts
rename to src/testRunner/rwcRunner.ts
index e86a8d01f70..eadbcc53e2d 100644
--- a/src/harness/rwcRunner.ts
+++ b/src/testRunner/rwcRunner.ts
@@ -1,7 +1,3 @@
-/// <reference path="harness.ts"/>
-/// <reference path="runnerbase.ts" />
-/// <reference path="loggedIO.ts" />
-/// <reference path="..\compiler\commandLineParser.ts"/>
 // In harness baselines, null is different than undefined. See `generateActual` in `harness.ts`.
 /* tslint:disable:no-null-keyword */
 
diff --git a/src/harness/test262Runner.ts b/src/testRunner/test262Runner.ts
similarity index 96%
rename from src/harness/test262Runner.ts
rename to src/testRunner/test262Runner.ts
index 1c421d07a3e..ec9e1347bc3 100644
--- a/src/harness/test262Runner.ts
+++ b/src/testRunner/test262Runner.ts
@@ -1,5 +1,3 @@
-/// <reference path="harness.ts" />
-/// <reference path="runnerbase.ts" />
 // In harness baselines, null is different than undefined. See `generateActual` in `harness.ts`.
 /* tslint:disable:no-null-keyword */
 
diff --git a/src/testRunner/tsconfig.json b/src/testRunner/tsconfig.json
new file mode 100644
index 00000000000..fee848e39ff
--- /dev/null
+++ b/src/testRunner/tsconfig.json
@@ -0,0 +1,39 @@
+{
+    "extends": "../tsconfig-base",
+    "compilerOptions": {
+        "outFile": "../../built/local/run.js",
+        "composite": false,
+        "declaration": false,
+        "types": [
+            "node", "mocha", "chai"
+        ],
+        "lib": [
+            "es6",
+            "scripthost"
+        ]
+    },
+    "references": [
+        { "path": "../core", "prepend": true },
+        { "path": "../parser", "prepend": true },
+        { "path": "../compiler", "prepend": true },
+        { "path": "../services", "prepend": true },
+        { "path": "../server", "prepend": true },
+        { "path": "../harness", "prepend": true },
+        { "path": "../typingsInstallerCore", "prepend": true }
+    ],
+
+    "files": [
+        "fourslashRunner.ts",
+        "compilerRunner.ts",
+        "projectsRunner.ts",
+        "rwcRunner.ts",
+        "externalCompileRunner.ts",
+        "test262Runner.ts",
+
+        "parallel/host.ts",
+        "parallel/worker.ts",
+        "parallel/shared.ts",
+
+        "runner.ts"
+    ]
+}
diff --git a/src/compiler/tsc.ts b/src/tsc/tsc.ts
similarity index 100%
rename from src/compiler/tsc.ts
rename to src/tsc/tsc.ts
diff --git a/src/tsc/tsconfig.json b/src/tsc/tsconfig.json
new file mode 100644
index 00000000000..675a9d5a8b7
--- /dev/null
+++ b/src/tsc/tsconfig.json
@@ -0,0 +1,13 @@
+{
+    "extends": "../tsconfig-base",
+    "compilerOptions": {
+        "outFile": "../../built/local/tsc.js"
+    },
+    "files": [
+        "tsc.ts"
+    ],
+    "references": [
+        { "path": "../core", "prepend": true },
+        { "path": "../compiler", "prepend": true }
+    ]
+}
diff --git a/src/tsconfig-base.json b/src/tsconfig-base.json
index 92c32e73fcc..463d9b9da36 100644
--- a/src/tsconfig-base.json
+++ b/src/tsconfig-base.json
@@ -1,19 +1,24 @@
 {
     "compilerOptions": {
+        "pretty": true,
         "lib": ["es5"],
+        "target": "es5",
+
+        "declaration": true,
+        "sourceMap": true,
+        "composite": true,
         "noEmitOnError": true,
+
         "strictNullChecks": true,
         "noImplicitAny": true,
         "noImplicitThis": true,
         "noUnusedLocals": true,
         "noUnusedParameters": true,
+
         "alwaysStrict": true,
-        "pretty": true,
         "preserveConstEnums": true,
-        "stripInternal": true,
-        "sourceMap": true,
-        "target": "es5",
         "newLine": "lf",
+
         "types": []
     }
 }
diff --git a/src/tsconfig.json b/src/tsconfig.json
new file mode 100644
index 00000000000..abb0f16132f
--- /dev/null
+++ b/src/tsconfig.json
@@ -0,0 +1,7 @@
+{
+    "files": [],
+    "include": [],
+    "references": [
+        { "path": "./tsc" }
+    ]
+}
\ No newline at end of file
diff --git a/src/server/server.ts b/src/tsserver/server.ts
similarity index 100%
rename from src/server/server.ts
rename to src/tsserver/server.ts
diff --git a/src/tsserver/tsconfig.json b/src/tsserver/tsconfig.json
new file mode 100644
index 00000000000..8c908f31f33
--- /dev/null
+++ b/src/tsserver/tsconfig.json
@@ -0,0 +1,19 @@
+{
+    "extends": "../tsconfig-base",
+ 
+    "compilerOptions": {
+        "outFile": "../../built/local/tsserver.js",
+        "types": [
+            "node"
+        ]
+    },
+    "files": [
+        "server.ts"
+    ],
+    "references": [
+        { "path": "../core", "prepend": true },
+        { "path": "../compiler", "prepend": true },
+        { "path": "../services", "prepend": true },
+        { "path": "../server", "prepend": true }
+    ]
+}
diff --git a/src/server/typingsInstaller/nodeTypingsInstaller.ts b/src/typingsInstaller/nodeTypingsInstaller.ts
similarity index 100%
rename from src/server/typingsInstaller/nodeTypingsInstaller.ts
rename to src/typingsInstaller/nodeTypingsInstaller.ts
diff --git a/src/typingsInstaller/tsconfig.json b/src/typingsInstaller/tsconfig.json
new file mode 100644
index 00000000000..9b8ce1b4aa4
--- /dev/null
+++ b/src/typingsInstaller/tsconfig.json
@@ -0,0 +1,28 @@
+{
+    "extends": "../tsconfig-base",
+    "compilerOptions": {
+        "removeComments": true,
+        "outFile": "../built/local/typingsInstaller.js",
+        "types": [
+            "node"
+        ],
+        "lib": [
+            "es6",
+            "scripthost"
+        ]
+    },
+    "references": [
+        { "path": "../core", "prepend": true },
+        { "path": "../parser", "prepend": true },
+
+        /* todo - only need jsTyping and semver from this compilation! */
+        { "path": "../compiler", "prepend": true },
+        { "path": "../services", "prepend": true },
+        { "path": "../server", "prepend": true },
+
+        { "path": "../typingsInstallerCore", "prepend": true }
+    ],
+    "files": [
+        "nodeTypingsInstaller.ts"
+    ]
+}
diff --git a/src/typingsInstallerCore/tsconfig.json b/src/typingsInstallerCore/tsconfig.json
new file mode 100644
index 00000000000..90a40cd8302
--- /dev/null
+++ b/src/typingsInstallerCore/tsconfig.json
@@ -0,0 +1,25 @@
+{
+    "extends": "../tsconfig-base",
+    "compilerOptions": {
+        "outFile": "../../built/local/typingsInstallerCore.js",
+        "types": [
+            "node"
+        ],
+        "lib": [
+            "es6",
+            "scripthost"
+        ]
+    },
+    "references": [
+        { "path": "../core" },
+        { "path": "../parser" },
+
+        /* todo - only need jsTyping and semver from this compilation! */
+        { "path": "../compiler" },
+        { "path": "../services" },
+        { "path": "../server" }
+    ],
+    "files": [
+        "typingsInstaller.ts"
+    ]
+}
diff --git a/src/server/typingsInstaller/typingsInstaller.ts b/src/typingsInstallerCore/typingsInstaller.ts
similarity index 100%
rename from src/server/typingsInstaller/typingsInstaller.ts
rename to src/typingsInstallerCore/typingsInstaller.ts
diff --git a/src/harness/unittests/asserts.ts b/src/unittests/asserts.ts
similarity index 91%
rename from src/harness/unittests/asserts.ts
rename to src/unittests/asserts.ts
index ec274c44c22..8d5138085a8 100644
--- a/src/harness/unittests/asserts.ts
+++ b/src/unittests/asserts.ts
@@ -1,5 +1,3 @@
-/// <reference path="..\harness.ts" />
-
 namespace ts {
     describe("assert", () => {
         it("deepEqual", () => {
diff --git a/src/harness/unittests/base64.ts b/src/unittests/base64.ts
similarity index 92%
rename from src/harness/unittests/base64.ts
rename to src/unittests/base64.ts
index b503955ee68..11c2623df65 100644
--- a/src/harness/unittests/base64.ts
+++ b/src/unittests/base64.ts
@@ -1,4 +1,3 @@
-/// <reference path="../harness.ts" />
 namespace ts {
     describe("base64", () => {
         describe("base64decode", () => {
diff --git a/src/harness/unittests/builder.ts b/src/unittests/builder.ts
similarity index 97%
rename from src/harness/unittests/builder.ts
rename to src/unittests/builder.ts
index 3dcf3174f6f..4a163d6b56b 100644
--- a/src/harness/unittests/builder.ts
+++ b/src/unittests/builder.ts
@@ -1,5 +1,3 @@
-/// <reference path="reuseProgramStructure.ts" />
-
 namespace ts {
     describe("builder", () => {
         it("emits dependent files", () => {
diff --git a/src/harness/unittests/cancellableLanguageServiceOperations.ts b/src/unittests/cancellableLanguageServiceOperations.ts
similarity index 97%
rename from src/harness/unittests/cancellableLanguageServiceOperations.ts
rename to src/unittests/cancellableLanguageServiceOperations.ts
index a198210f76b..a5947cc17e3 100644
--- a/src/harness/unittests/cancellableLanguageServiceOperations.ts
+++ b/src/unittests/cancellableLanguageServiceOperations.ts
@@ -1,5 +1,3 @@
-/// <reference path="..\harness.ts" />
-
 namespace ts {
     describe("cancellableLanguageServiceOperations", () => {
         const file = `
diff --git a/src/harness/unittests/commandLineParsing.ts b/src/unittests/commandLineParsing.ts
similarity index 97%
rename from src/harness/unittests/commandLineParsing.ts
rename to src/unittests/commandLineParsing.ts
index 4f71d414249..cf7cabdd26d 100644
--- a/src/harness/unittests/commandLineParsing.ts
+++ b/src/unittests/commandLineParsing.ts
@@ -1,6 +1,3 @@
-/// <reference path="..\harness.ts" />
-/// <reference path="..\..\compiler\commandLineParser.ts" />
-
 namespace ts {
     describe("parseCommandLine", () => {
 
diff --git a/src/harness/unittests/compileOnSave.ts b/src/unittests/compileOnSave.ts
similarity index 97%
rename from src/harness/unittests/compileOnSave.ts
rename to src/unittests/compileOnSave.ts
index 587ac3dbb5e..49d1659deec 100644
--- a/src/harness/unittests/compileOnSave.ts
+++ b/src/unittests/compileOnSave.ts
@@ -1,7 +1,3 @@
-/// <reference path="../harness.ts" />
-/// <reference path="./tsserverProjectSystem.ts" />
-/// <reference path="../../server/typingsInstaller/typingsInstaller.ts" />
-
 namespace ts.projectSystem {
     import CommandNames = server.CommandNames;
     const nullCancellationToken = server.nullCancellationToken;
diff --git a/src/harness/unittests/configurationExtension.ts b/src/unittests/configurationExtension.ts
similarity index 97%
rename from src/harness/unittests/configurationExtension.ts
rename to src/unittests/configurationExtension.ts
index ca7b06c495d..012b8e0d2fa 100644
--- a/src/harness/unittests/configurationExtension.ts
+++ b/src/unittests/configurationExtension.ts
@@ -1,7 +1,3 @@
-/// <reference path="../harness.ts" />
-/// <reference path="../vfs.ts" />
-/// <reference path="../compiler.ts" />
-
 namespace ts {
     function createFileSystem(ignoreCase: boolean, cwd: string, root: string) {
         return new vfs.FileSystem(ignoreCase, {
diff --git a/src/harness/unittests/convertCompilerOptionsFromJson.ts b/src/unittests/convertCompilerOptionsFromJson.ts
similarity index 97%
rename from src/harness/unittests/convertCompilerOptionsFromJson.ts
rename to src/unittests/convertCompilerOptionsFromJson.ts
index b2b07fc8825..b1695ad01f5 100644
--- a/src/harness/unittests/convertCompilerOptionsFromJson.ts
+++ b/src/unittests/convertCompilerOptionsFromJson.ts
@@ -1,8 +1,3 @@
-/// <reference path="..\harness.ts" />
-/// <reference path="..\..\compiler\commandLineParser.ts" />
-/// <reference path="../compiler.ts" />
-/// <reference path="../vfs.ts" />
-
 namespace ts {
     describe("convertCompilerOptionsFromJson", () => {
         function assertCompilerOptions(json: any, configFileName: string, expectedResult: { compilerOptions: CompilerOptions, errors: Diagnostic[] }) {
diff --git a/src/harness/unittests/convertToBase64.ts b/src/unittests/convertToBase64.ts
similarity index 94%
rename from src/harness/unittests/convertToBase64.ts
rename to src/unittests/convertToBase64.ts
index 93c149c72ee..e41f73034c4 100644
--- a/src/harness/unittests/convertToBase64.ts
+++ b/src/unittests/convertToBase64.ts
@@ -1,5 +1,3 @@
-/// <reference path="..\harness.ts" />
-
 namespace ts {
     describe("convertToBase64", () => {
         function runTest(input: string): void {
diff --git a/src/harness/unittests/convertTypeAcquisitionFromJson.ts b/src/unittests/convertTypeAcquisitionFromJson.ts
similarity index 95%
rename from src/harness/unittests/convertTypeAcquisitionFromJson.ts
rename to src/unittests/convertTypeAcquisitionFromJson.ts
index 7faf0b8fdf9..b46d37f0428 100644
--- a/src/harness/unittests/convertTypeAcquisitionFromJson.ts
+++ b/src/unittests/convertTypeAcquisitionFromJson.ts
@@ -1,8 +1,3 @@
-/// <reference path="..\harness.ts" />
-/// <reference path="..\..\compiler\commandLineParser.ts" />
-/// <reference path="../compiler.ts" />
-/// <reference path="../vfs.ts" />
-
 namespace ts {
     interface ExpectedResult { typeAcquisition: TypeAcquisition; errors: Diagnostic[]; }
     describe("convertTypeAcquisitionFromJson", () => {
diff --git a/src/harness/unittests/customTransforms.ts b/src/unittests/customTransforms.ts
similarity index 95%
rename from src/harness/unittests/customTransforms.ts
rename to src/unittests/customTransforms.ts
index 47aaf16acec..8cbc42f7599 100644
--- a/src/harness/unittests/customTransforms.ts
+++ b/src/unittests/customTransforms.ts
@@ -1,6 +1,3 @@
-/// <reference path="..\..\compiler\emitter.ts" />
-/// <reference path="..\harness.ts" />
-
 namespace ts {
     describe("customTransforms", () => {
         function emitsCorrectly(name: string, sources: { file: string, text: string }[], customTransformers: CustomTransformers, options: CompilerOptions = {}) {
diff --git a/src/harness/unittests/evaluation/asyncArrow.ts b/src/unittests/evaluation/asyncArrow.ts
similarity index 100%
rename from src/harness/unittests/evaluation/asyncArrow.ts
rename to src/unittests/evaluation/asyncArrow.ts
diff --git a/src/harness/unittests/evaluation/asyncGenerator.ts b/src/unittests/evaluation/asyncGenerator.ts
similarity index 100%
rename from src/harness/unittests/evaluation/asyncGenerator.ts
rename to src/unittests/evaluation/asyncGenerator.ts
diff --git a/src/harness/unittests/evaluation/forAwaitOf.ts b/src/unittests/evaluation/forAwaitOf.ts
similarity index 100%
rename from src/harness/unittests/evaluation/forAwaitOf.ts
rename to src/unittests/evaluation/forAwaitOf.ts
diff --git a/src/harness/unittests/extractConstants.ts b/src/unittests/extractConstants.ts
similarity index 95%
rename from src/harness/unittests/extractConstants.ts
rename to src/unittests/extractConstants.ts
index 9dfb1264a70..e0ef305812c 100644
--- a/src/harness/unittests/extractConstants.ts
+++ b/src/unittests/extractConstants.ts
@@ -1,5 +1,3 @@
-/// <reference path="extractTestHelpers.ts" />
-
 namespace ts {
     describe("extractConstants", () => {
         testExtractConstant("extractConstant_TopLevel",
diff --git a/src/harness/unittests/extractFunctions.ts b/src/unittests/extractFunctions.ts
similarity index 95%
rename from src/harness/unittests/extractFunctions.ts
rename to src/unittests/extractFunctions.ts
index 5e9214fb35e..1f90e1cc600 100644
--- a/src/harness/unittests/extractFunctions.ts
+++ b/src/unittests/extractFunctions.ts
@@ -1,5 +1,3 @@
-/// <reference path="extractTestHelpers.ts" />
-
 namespace ts {
     describe("extractFunctions", () => {
         testExtractFunction("extractFunction1",
diff --git a/src/harness/unittests/extractRanges.ts b/src/unittests/extractRanges.ts
similarity index 95%
rename from src/harness/unittests/extractRanges.ts
rename to src/unittests/extractRanges.ts
index 73937756769..9cd76dd49e9 100644
--- a/src/harness/unittests/extractRanges.ts
+++ b/src/unittests/extractRanges.ts
@@ -1,5 +1,3 @@
-/// <reference path="extractTestHelpers.ts" />
-
 namespace ts {
     function testExtractRangeFailed(caption: string, s: string, expectedErrors: string[]) {
         return it(caption, () => {
diff --git a/src/harness/unittests/extractTestHelpers.ts b/src/unittests/extractTestHelpers.ts
similarity index 96%
rename from src/harness/unittests/extractTestHelpers.ts
rename to src/unittests/extractTestHelpers.ts
index 252112cddac..c36ac88e8e0 100644
--- a/src/harness/unittests/extractTestHelpers.ts
+++ b/src/unittests/extractTestHelpers.ts
@@ -1,6 +1,3 @@
-/// <reference path="..\harness.ts" />
-/// <reference path="tsserverProjectSystem.ts" />
-
 namespace ts {
     interface Range {
         pos: number;
diff --git a/src/harness/unittests/hostNewLineSupport.ts b/src/unittests/hostNewLineSupport.ts
similarity index 96%
rename from src/harness/unittests/hostNewLineSupport.ts
rename to src/unittests/hostNewLineSupport.ts
index fee58d92e4f..abd79210086 100644
--- a/src/harness/unittests/hostNewLineSupport.ts
+++ b/src/unittests/hostNewLineSupport.ts
@@ -1,4 +1,3 @@
-/// <reference path="..\harness.ts" />
 namespace ts {
     describe("hostNewLineSupport", () => {
         function testLSWithFiles(settings: CompilerOptions, files: Harness.Compiler.TestFile[]) {
diff --git a/src/harness/unittests/incrementalParser.ts b/src/unittests/incrementalParser.ts
similarity index 97%
rename from src/harness/unittests/incrementalParser.ts
rename to src/unittests/incrementalParser.ts
index 3792664601e..fb3408b1fc3 100644
--- a/src/harness/unittests/incrementalParser.ts
+++ b/src/unittests/incrementalParser.ts
@@ -1,6 +1,3 @@
-/// <reference path="..\harness.ts" />
-/// <reference path="..\..\compiler\parser.ts" />
-
 namespace ts {
     ts.disableIncrementalParsing = false; // tslint:disable-line no-unnecessary-qualifier (make clear this is a global mutation!)
 
diff --git a/src/harness/unittests/initializeTSConfig.ts b/src/unittests/initializeTSConfig.ts
similarity index 93%
rename from src/harness/unittests/initializeTSConfig.ts
rename to src/unittests/initializeTSConfig.ts
index b67fce6226f..c75e7ee1bf6 100644
--- a/src/harness/unittests/initializeTSConfig.ts
+++ b/src/unittests/initializeTSConfig.ts
@@ -1,6 +1,3 @@
-/// <reference path="..\harness.ts" />
-/// <reference path="..\..\compiler\commandLineParser.ts" />
-
 namespace ts {
     describe("initTSConfig", () => {
         function initTSConfigCorrectly(name: string, commandLinesArgs: string[]) {
diff --git a/src/harness/unittests/jsDocParsing.ts b/src/unittests/jsDocParsing.ts
similarity index 96%
rename from src/harness/unittests/jsDocParsing.ts
rename to src/unittests/jsDocParsing.ts
index cad5ed94b32..9a97cdc1505 100644
--- a/src/harness/unittests/jsDocParsing.ts
+++ b/src/unittests/jsDocParsing.ts
@@ -1,6 +1,3 @@
-/// <reference path="..\..\compiler\parser.ts" />
-/// <reference path="..\harness.ts" />
-
 namespace ts {
     describe("JSDocParsing", () => {
         describe("TypeExpressions", () => {
diff --git a/src/harness/unittests/languageService.ts b/src/unittests/languageService.ts
similarity index 95%
rename from src/harness/unittests/languageService.ts
rename to src/unittests/languageService.ts
index 14bdff9867e..ce8fa93d1f9 100644
--- a/src/harness/unittests/languageService.ts
+++ b/src/unittests/languageService.ts
@@ -1,5 +1,3 @@
-/// <reference path="..\harness.ts" />
-
 namespace ts {
     describe("languageService", () => {
         const files: {[index: string]: string} = {
diff --git a/src/harness/unittests/matchFiles.ts b/src/unittests/matchFiles.ts
similarity index 97%
rename from src/harness/unittests/matchFiles.ts
rename to src/unittests/matchFiles.ts
index 4662dd9f536..5ece71245bb 100644
--- a/src/harness/unittests/matchFiles.ts
+++ b/src/unittests/matchFiles.ts
@@ -1,7 +1,3 @@
-/// <reference path="../harness.ts" />
-/// <reference path="../compiler.ts" />
-/// <reference path="../vfs.ts" />
-
 namespace ts {
     const caseInsensitiveBasePath = "c:/dev/";
     const caseInsensitiveTsconfigPath = "c:/dev/tsconfig.json";
diff --git a/src/harness/unittests/moduleResolution.ts b/src/unittests/moduleResolution.ts
similarity index 98%
rename from src/harness/unittests/moduleResolution.ts
rename to src/unittests/moduleResolution.ts
index bc221dc8b07..e97a3f5fc42 100644
--- a/src/harness/unittests/moduleResolution.ts
+++ b/src/unittests/moduleResolution.ts
@@ -1,5 +1,3 @@
-/// <reference path="..\harness.ts" />
-
 namespace ts {
     export function checkResolvedModule(expected: ResolvedModuleFull | undefined, actual: ResolvedModuleFull): boolean {
         if (!expected === !actual) {
diff --git a/src/harness/unittests/organizeImports.ts b/src/unittests/organizeImports.ts
similarity index 96%
rename from src/harness/unittests/organizeImports.ts
rename to src/unittests/organizeImports.ts
index 9dea2d0d51e..b889f97ef1c 100644
--- a/src/harness/unittests/organizeImports.ts
+++ b/src/unittests/organizeImports.ts
@@ -1,7 +1,3 @@
-/// <reference path="..\..\..\src\harness\harness.ts" />
-/// <reference path="..\..\..\src\harness\vfs.ts" />
-
-
 namespace ts {
     describe("Organize imports", () => {
         describe("Sort imports", () => {
diff --git a/src/harness/unittests/paths.ts b/src/unittests/paths.ts
similarity index 100%
rename from src/harness/unittests/paths.ts
rename to src/unittests/paths.ts
diff --git a/src/harness/unittests/printer.ts b/src/unittests/printer.ts
similarity index 97%
rename from src/harness/unittests/printer.ts
rename to src/unittests/printer.ts
index 6392fd3e9f3..ba9abe41e9f 100644
--- a/src/harness/unittests/printer.ts
+++ b/src/unittests/printer.ts
@@ -1,6 +1,3 @@
-/// <reference path="..\..\compiler\emitter.ts" />
-/// <reference path="..\harness.ts" />
-
 namespace ts {
     describe("PrinterAPI", () => {
         function makePrintsCorrectly(prefix: string) {
diff --git a/src/harness/unittests/programMissingFiles.ts b/src/unittests/programMissingFiles.ts
similarity index 95%
rename from src/harness/unittests/programMissingFiles.ts
rename to src/unittests/programMissingFiles.ts
index 66b2ab4cf7f..37d4c791196 100644
--- a/src/harness/unittests/programMissingFiles.ts
+++ b/src/unittests/programMissingFiles.ts
@@ -1,7 +1,3 @@
-/// <reference path="..\harness.ts" />
-/// <reference path="../documents.ts" />
-/// <reference path="../vfs.ts" />
-
 namespace ts {
     function verifyMissingFilePaths(missingPaths: ReadonlyArray<Path>, expected: ReadonlyArray<string>) {
         assert.isDefined(missingPaths);
diff --git a/src/harness/unittests/programNoParseFalsyFileNames.ts b/src/unittests/programNoParseFalsyFileNames.ts
similarity index 96%
rename from src/harness/unittests/programNoParseFalsyFileNames.ts
rename to src/unittests/programNoParseFalsyFileNames.ts
index 3270f6b14be..8040e7c7f43 100644
--- a/src/harness/unittests/programNoParseFalsyFileNames.ts
+++ b/src/unittests/programNoParseFalsyFileNames.ts
@@ -1,4 +1,3 @@
-/// <reference path="..\harness.ts" />
 namespace ts {
     describe("programNoParseFalsyFileNames", () => {
         let program: Program;
diff --git a/src/harness/unittests/projectErrors.ts b/src/unittests/projectErrors.ts
similarity index 96%
rename from src/harness/unittests/projectErrors.ts
rename to src/unittests/projectErrors.ts
index ae272fd58c6..b17494b59fb 100644
--- a/src/harness/unittests/projectErrors.ts
+++ b/src/unittests/projectErrors.ts
@@ -1,7 +1,3 @@
-/// <reference path="../harness.ts" />
-/// <reference path="./tsserverProjectSystem.ts" />
-/// <reference path="../../server/typingsInstaller/typingsInstaller.ts" />
-
 namespace ts.projectSystem {
     describe("Project errors", () => {
         function checkProjectErrors(projectFiles: server.ProjectFilesWithTSDiagnostics, expectedErrors: ReadonlyArray<string>): void {
diff --git a/src/harness/unittests/projectReferences.ts b/src/unittests/projectReferences.ts
similarity index 96%
rename from src/harness/unittests/projectReferences.ts
rename to src/unittests/projectReferences.ts
index 97628d17141..070d26cccd5 100644
--- a/src/harness/unittests/projectReferences.ts
+++ b/src/unittests/projectReferences.ts
@@ -1,6 +1,3 @@
-/// <reference path="../harness.ts" />
-/// <reference path="../../compiler/commandLineParser.ts" />
-
 namespace ts {
     interface TestProjectSpecification {
         configFileName?: string;
diff --git a/src/harness/unittests/publicApi.ts b/src/unittests/publicApi.ts
similarity index 94%
rename from src/harness/unittests/publicApi.ts
rename to src/unittests/publicApi.ts
index 0a5280f5273..bf66630de95 100644
--- a/src/harness/unittests/publicApi.ts
+++ b/src/unittests/publicApi.ts
@@ -1,5 +1,3 @@
-/// <reference path="../harness.ts" />
-
 describe("Public APIs", () => {
     function verifyApi(fileName: string) {
         const builtFile = `built/local/${fileName}`;
diff --git a/src/harness/unittests/reuseProgramStructure.ts b/src/unittests/reuseProgramStructure.ts
similarity index 98%
rename from src/harness/unittests/reuseProgramStructure.ts
rename to src/unittests/reuseProgramStructure.ts
index 27873925302..44082f3a302 100644
--- a/src/harness/unittests/reuseProgramStructure.ts
+++ b/src/unittests/reuseProgramStructure.ts
@@ -1,6 +1,3 @@
-/// <reference path="..\harness.ts" />
-/// <reference path="..\..\harness\harnessLanguageService.ts" />
-
 namespace ts {
 
     const enum ChangedPart {
diff --git a/src/harness/unittests/services/colorization.ts b/src/unittests/services/colorization.ts
similarity index 97%
rename from src/harness/unittests/services/colorization.ts
rename to src/unittests/services/colorization.ts
index a05ca01641e..e3295e6fee8 100644
--- a/src/harness/unittests/services/colorization.ts
+++ b/src/unittests/services/colorization.ts
@@ -1,5 +1,3 @@
-/// <reference path="..\..\harnessLanguageService.ts" />
-
 // tslint:disable no-invalid-template-strings (lots of tests use quoted code)
 
 interface ClassificationEntry {
diff --git a/src/harness/unittests/services/documentRegistry.ts b/src/unittests/services/documentRegistry.ts
similarity index 97%
rename from src/harness/unittests/services/documentRegistry.ts
rename to src/unittests/services/documentRegistry.ts
index ab624a17dbf..a3dad56f42b 100644
--- a/src/harness/unittests/services/documentRegistry.ts
+++ b/src/unittests/services/documentRegistry.ts
@@ -1,5 +1,3 @@
-/// <reference path="..\..\harness.ts" />
-
 describe("DocumentRegistry", () => {
     it("documents are shared between projects", () => {
         const documentRegistry = ts.createDocumentRegistry();
diff --git a/src/harness/unittests/services/patternMatcher.ts b/src/unittests/services/patternMatcher.ts
similarity index 97%
rename from src/harness/unittests/services/patternMatcher.ts
rename to src/unittests/services/patternMatcher.ts
index d40354a5e60..5e35d2020db 100644
--- a/src/harness/unittests/services/patternMatcher.ts
+++ b/src/unittests/services/patternMatcher.ts
@@ -1,5 +1,3 @@
-/// <reference path="..\..\..\services\patternMatcher.ts" />
-
 describe("PatternMatcher", () => {
     describe("BreakIntoCharacterSpans", () => {
         it("EmptyIdentifier", () => {
diff --git a/src/harness/unittests/services/preProcessFile.ts b/src/unittests/services/preProcessFile.ts
similarity index 97%
rename from src/harness/unittests/services/preProcessFile.ts
rename to src/unittests/services/preProcessFile.ts
index 56d66a245ec..a89b6337c84 100644
--- a/src/harness/unittests/services/preProcessFile.ts
+++ b/src/unittests/services/preProcessFile.ts
@@ -1,5 +1,3 @@
-/// <reference path="..\..\harnessLanguageService.ts" />
-
 describe("PreProcessFile:", () => {
     function test(sourceText: string, readImportFile: boolean, detectJavaScriptImports: boolean, expectedPreProcess: ts.PreProcessedFileInfo): void {
         const resultPreProcess = ts.preProcessFile(sourceText, readImportFile, detectJavaScriptImports);
diff --git a/src/harness/unittests/session.ts b/src/unittests/session.ts
similarity index 97%
rename from src/harness/unittests/session.ts
rename to src/unittests/session.ts
index cdb6e818d7b..b3b2cf6ce22 100644
--- a/src/harness/unittests/session.ts
+++ b/src/unittests/session.ts
@@ -1,5 +1,3 @@
-/// <reference path="..\harness.ts" />
-
 const expect: typeof _chai.expect = _chai.expect;
 
 namespace ts.server {
diff --git a/src/harness/unittests/symbolWalker.ts b/src/unittests/symbolWalker.ts
similarity index 95%
rename from src/harness/unittests/symbolWalker.ts
rename to src/unittests/symbolWalker.ts
index a5939da68bf..4743b87133b 100644
--- a/src/harness/unittests/symbolWalker.ts
+++ b/src/unittests/symbolWalker.ts
@@ -1,5 +1,3 @@
-/// <reference path="..\harness.ts" />
-
 namespace ts {
     describe("Symbol Walker", () => {
         function test(description: string, source: string, verifier: (file: SourceFile, checker: TypeChecker) => void) {
diff --git a/src/harness/unittests/telemetry.ts b/src/unittests/telemetry.ts
similarity index 96%
rename from src/harness/unittests/telemetry.ts
rename to src/unittests/telemetry.ts
index 53025e15a9c..7c3a05d02fc 100644
--- a/src/harness/unittests/telemetry.ts
+++ b/src/unittests/telemetry.ts
@@ -1,6 +1,3 @@
-/// <reference path="../harness.ts" />
-/// <reference path="./tsserverProjectSystem.ts" />
-
 namespace ts.projectSystem {
     describe("project telemetry", () => {
         it("does nothing for inferred project", () => {
diff --git a/src/harness/unittests/textChanges.ts b/src/unittests/textChanges.ts
similarity index 97%
rename from src/harness/unittests/textChanges.ts
rename to src/unittests/textChanges.ts
index 5303c9bcc28..0c06eecb51d 100644
--- a/src/harness/unittests/textChanges.ts
+++ b/src/unittests/textChanges.ts
@@ -1,7 +1,3 @@
-/// <reference path="..\..\compiler\emitter.ts" />
-/// <reference path="..\..\services\textChanges.ts" />
-/// <reference path="..\harness.ts" />
-
 // Some tests have trailing whitespace
 // tslint:disable trim-trailing-whitespace
 
diff --git a/src/harness/unittests/textStorage.ts b/src/unittests/textStorage.ts
similarity index 93%
rename from src/harness/unittests/textStorage.ts
rename to src/unittests/textStorage.ts
index 755766bd02f..9938ed106e7 100644
--- a/src/harness/unittests/textStorage.ts
+++ b/src/unittests/textStorage.ts
@@ -1,7 +1,3 @@
-/// <reference path="../harness.ts" />
-/// <reference path="../../server/scriptVersionCache.ts"/>
-/// <reference path="./tsserverProjectSystem.ts" />
-
 namespace ts.textStorage {
     describe("Text storage", () => {
         const f = {
diff --git a/src/harness/unittests/transform.ts b/src/unittests/transform.ts
similarity index 97%
rename from src/harness/unittests/transform.ts
rename to src/unittests/transform.ts
index f513adf6bf2..6c74c558b16 100644
--- a/src/harness/unittests/transform.ts
+++ b/src/unittests/transform.ts
@@ -1,6 +1,3 @@
-/// <reference path="..\..\services\transform.ts" />
-/// <reference path="..\harness.ts" />
-
 namespace ts {
     describe("TransformAPI", () => {
         function replaceUndefinedWithVoid0(context: TransformationContext) {
diff --git a/src/harness/unittests/transpile.ts b/src/unittests/transpile.ts
similarity index 97%
rename from src/harness/unittests/transpile.ts
rename to src/unittests/transpile.ts
index 70f7ebdbc46..0ef89edaab6 100644
--- a/src/harness/unittests/transpile.ts
+++ b/src/unittests/transpile.ts
@@ -1,5 +1,3 @@
-/// <reference path="..\harness.ts" />
-
 namespace ts {
     describe("Transpile", () => {
 
diff --git a/src/harness/unittests/tsbuild.ts b/src/unittests/tsbuild.ts
similarity index 100%
rename from src/harness/unittests/tsbuild.ts
rename to src/unittests/tsbuild.ts
diff --git a/src/harness/unittests/tscWatchMode.ts b/src/unittests/tscWatchMode.ts
similarity index 97%
rename from src/harness/unittests/tscWatchMode.ts
rename to src/unittests/tscWatchMode.ts
index e6fffbc5e79..4d6797f08da 100644
--- a/src/harness/unittests/tscWatchMode.ts
+++ b/src/unittests/tscWatchMode.ts
@@ -1,7 +1,3 @@
-/// <reference path="..\harness.ts" />
-/// <reference path="..\..\compiler\watch.ts" />
-/// <reference path="..\virtualFileSystemWithWatch.ts" />
-
 namespace ts.tscWatch {
     import WatchedSystem = TestFSWithWatch.TestServerHost;
     type File = TestFSWithWatch.File;
diff --git a/src/unittests/tsconfig.json b/src/unittests/tsconfig.json
new file mode 100644
index 00000000000..683812ba029
--- /dev/null
+++ b/src/unittests/tsconfig.json
@@ -0,0 +1,23 @@
+{
+    "extends": "../tsconfig-base",
+    "compilerOptions": {
+        "outFile": "../../built/local/unittests.js",
+        "types": [
+            "node", "mocha", "chai"
+        ],
+        "lib": [
+            "es6",
+            "scripthost"
+        ]
+    },
+    "references": [
+        { "path": "../core" },
+        { "path": "../parser" },
+        { "path": "../compiler" },
+        { "path": "../services" },
+        { "path": "../server" },
+        { "path": "../typingsInstallerCore" },
+        { "path": "../harness" }
+    ],
+    "include": ["**/*.ts"]
+}
diff --git a/src/harness/unittests/tsconfigParsing.ts b/src/unittests/tsconfigParsing.ts
similarity index 96%
rename from src/harness/unittests/tsconfigParsing.ts
rename to src/unittests/tsconfigParsing.ts
index f46cee3656b..4b590ba51ce 100644
--- a/src/harness/unittests/tsconfigParsing.ts
+++ b/src/unittests/tsconfigParsing.ts
@@ -1,8 +1,3 @@
-/// <reference path="..\harness.ts" />
-/// <reference path="..\..\compiler\commandLineParser.ts" />
-/// <reference path="../compiler.ts" />
-/// <reference path="../vfs.ts" />
-
 namespace ts {
     describe("parseConfigFileTextToJson", () => {
         function assertParseResult(jsonText: string, expectedConfigObject: { config?: any; error?: Diagnostic[] }) {
diff --git a/src/harness/unittests/tsserverProjectSystem.ts b/src/unittests/tsserverProjectSystem.ts
similarity index 97%
rename from src/harness/unittests/tsserverProjectSystem.ts
rename to src/unittests/tsserverProjectSystem.ts
index 70341b18368..f48f59c6970 100644
--- a/src/harness/unittests/tsserverProjectSystem.ts
+++ b/src/unittests/tsserverProjectSystem.ts
@@ -1,7 +1,3 @@
-/// <reference path="..\harness.ts" />
-/// <reference path="..\virtualFileSystemWithWatch.ts" />
-/// <reference path="../../server/typingsInstaller/typingsInstaller.ts" />
-
 namespace ts.projectSystem {
     import TI = server.typingsInstaller;
     import protocol = server.protocol;
diff --git a/src/harness/unittests/typingsInstaller.ts b/src/unittests/typingsInstaller.ts
similarity index 97%
rename from src/harness/unittests/typingsInstaller.ts
rename to src/unittests/typingsInstaller.ts
index 0b355d5aa89..a2670483350 100644
--- a/src/harness/unittests/typingsInstaller.ts
+++ b/src/unittests/typingsInstaller.ts
@@ -1,8 +1,3 @@
-/// <reference path="../harness.ts" />
-/// <reference path="./tsserverProjectSystem.ts" />
-/// <reference path="../../server/typingsInstaller/typingsInstaller.ts" />
-/// <reference path="../../services/semver.ts" />
-
 namespace ts.projectSystem {
     import TI = server.typingsInstaller;
     import validatePackageName = JsTyping.validatePackageName;
diff --git a/src/harness/unittests/versionCache.ts b/src/unittests/versionCache.ts
similarity index 96%
rename from src/harness/unittests/versionCache.ts
rename to src/unittests/versionCache.ts
index 40f5f43b6dc..cc534b6fa5b 100644
--- a/src/harness/unittests/versionCache.ts
+++ b/src/unittests/versionCache.ts
@@ -1,6 +1,3 @@
-/// <reference path="..\harness.ts" />
-/// <reference path="..\..\server\editorServices.ts" />
-
 namespace ts {
     function editFlat(position: number, deletedLength: number, newText: string, source: string) {
         return source.substring(0, position) + newText + source.substring(position + deletedLength, source.length);
diff --git a/src/server/watchGuard/tsconfig.json b/src/watchGuard/tsconfig.json
similarity index 65%
rename from src/server/watchGuard/tsconfig.json
rename to src/watchGuard/tsconfig.json
index 354d3d7f499..8a865c65c27 100644
--- a/src/server/watchGuard/tsconfig.json
+++ b/src/watchGuard/tsconfig.json
@@ -1,8 +1,8 @@
 {
-    "extends": "../../tsconfig-base",
+    "extends": "../tsconfig-base",
     "compilerOptions": {
         "removeComments": true,
-        "outFile": "../../../built/local/watchGuard.js",
+        "outFile": "../built/local/watchGuard.js",
         "types": [
             "node"
         ],
diff --git a/src/server/watchGuard/watchGuard.ts b/src/watchGuard/watchGuard.ts
similarity index 100%
rename from src/server/watchGuard/watchGuard.ts
rename to src/watchGuard/watchGuard.ts

From a61a7a2a6e33b43d715f462e9e6de662777ff49c Mon Sep 17 00:00:00 2001
From: Ryan Cavanaugh <the.ryan.cavanaugh@gmail.com>
Date: Sun, 10 Jun 2018 10:58:16 -0700
Subject: [PATCH 18/37] Attempt to rewrite the jakefile and fail

---
 Jakefile.js                                   | 332 ++++++++++++++++--
 package.json                                  |   1 +
 scripts/processDiagnosticMessages.ts          |  35 +-
 .../processDiagnosticMessages.tsconfig.json   |   9 +-
 scripts/tslint/tsconfig.json                  |   6 +-
 src/cancellationToken/tsconfig.json           |   2 +-
 src/harness/tsconfig.json                     |   4 +-
 .../diagnosticInformationMap.generated.ts     |   2 +-
 src/tsc/tsconfig.json                         |   1 +
 src/tsconfig.json                             |   7 +-
 src/tsserver/tsconfig.json                    |   1 +
 src/typingsInstaller/tsconfig.json            |   2 +-
 src/watchGuard/tsconfig.json                  |   2 +-
 13 files changed, 354 insertions(+), 50 deletions(-)

diff --git a/Jakefile.js b/Jakefile.js
index 8329f66118f..93f6dc528d5 100644
--- a/Jakefile.js
+++ b/Jakefile.js
@@ -6,6 +6,7 @@ const fs = require("fs");
 const os = require("os");
 const path = require("path");
 const child_process = require("child_process");
+const removeInternal = require("remove-internal");
 const fold = require("travis-fold");
 const ts = require("./lib/typescript");
 const del = require("del");
@@ -13,60 +14,290 @@ const getDirSize = require("./scripts/build/getDirSize");
 
 const host = process.env.TYPESCRIPT_HOST || process.env.host || "node";
 
+const locales = ["cs", "de", "es", "fr", "it", "ja", "ko", "pl", "pt-br", "ru", "tr", "zh-cn", "zh-tw"];
+
 const defaultTestTimeout = 40000;
 
+let useDebugMode = true;
+
 const TaskNames = {
+    local: "local",
     runtests: "runtests",
     runtestsParallel: "runtests-parallel",
     buildRules: "build-rules",
-    clean: "clean"
-}
+    clean: "clean",
+    lib: "lib",
+    buildFoldStart: "build-fold-start",
+    buildFoldEnd: "build-fold-end",
+    generateDiagnostics: "generate-diagnostics",
+    coreBuild: "core-build",
+    lkg: "LKG",
+    release: "release",
+    lssl: "lssl",
+    lint: "lint"
+};
 
 const Paths = {
+    lkg: "lib",
     lkgCompiler: "lib/tsc.js",
+
     built: "built",
     builtLocal: "built/local",
     builtLocalCompiler: "built/local/tsc.js",
     builtLocalRun: "built/local/run.js",
+    locLcg: "built/local/enu/diagnosticMessages.generated.json.lcg",
+    typesMapOutput: "built/local/typesMap.json",
+    servicesFile: "built/local/typescriptServices.js",
+    servicesDefinitionFile: "built/local/typescriptServices.d.ts",
+    tsserverLibraryFile: "built/local/tsserverlibrary.js",
+    tsserverLibraryDefinitionFile: "built/local/tsserverlibrary.d.ts",
+
     baselines: {
         local: "tests/baselines/local",
         localTest262: "tests/baselines/test262/local",
         localRwc: "tests/baselines/rwc/local",
         reference: "tests/baselines/reference",
         referenceTest262: "tests/baselines/test262/reference",
-        referenceTwc: "tests/baselines/rwc/reference"
-    }
-}
+        referenceRwc: "tests/baselines/rwc/reference"
+    },
+    copyright: "CopyrightNotice.txt",
+    thirdParty: "ThirdPartyNoticeText.txt",
+    library: "src/lib",
+
+    processDiagnosticMessagesJs: "scripts/processDiagnosticMessages.js",
+    diagnosticInformationMap: "src/parser/diagnosticInformationMap.generated.ts",
+    diagnosticMessagesJson: "src/parser/diagnosticMessages.json",
+
+    srcServer: "src/server",
+
+};
 
 const ConfigFileFor = {
     tsc: "src/tsc",
     tsserver: "src/tsserver",
     runjs: "src/testRunner",
-    lint: "scripts/tslint"
+    lint: "scripts/tslint",
+    all: "src"
 };
 
-desc("Runs all the tests in parallel using the built run.js file. Optional arguments are: t[ests]=category1|category2|... d[ebug]=true.");
-task(TaskNames.runtestsParallel, [TaskNames.buildRules], function() {
-    tsbuild(ConfigFileFor.runjs);
-    runConsoleTests("min", /*parallel*/ true);
-}, { async: true});
+const ExpectedLKGFiles = [
+    "tsc.js",
+    "tsserver.js",
+    "typescriptServices.js",
+    "typescriptServices.d.ts",
+    "typescript.js",
+    "typescript.d.ts",
+    "tsserverlibrary.js",
+    "tsserverlibrary.d.js",
+    "cancellationToken.js",
+    "typingsInstaller.js",
+    "protocol.d.ts",
+    "watchGuard.js"
+];
+
+/** @type {{ libs: string[], paths?: Record<string, string>, sources?: Record<string, string[]> }} */
+const libraries = readJson("./src/lib/libs.json");
+
+directory(Paths.builtLocal);
+
+// Local target to build the compiler and services
+desc("Builds the full compiler and services");
+task(TaskNames.local, [
+    TaskNames.buildFoldStart,
+    TaskNames.generateDiagnostics,
+    TaskNames.lib,
+    TaskNames.coreBuild,
+    // buildProtocolDts,
+    // builtGeneratedDiagnosticMessagesJSON,
+    TaskNames.lssl,
+    // "localize",
+    TaskNames.buildFoldEnd
+]);
 
 desc("Runs all the tests in parallel using the built run.js file. Optional arguments are: t[ests]=category1|category2|... d[ebug]=true.");
-task(TaskNames.runtests, [TaskNames.buildRules], function() {
-    tsbuild(ConfigFileFor.runjs);
+task(TaskNames.runtestsParallel, [TaskNames.lib], function () {
+    tsbuild([ConfigFileFor.runjs, ConfigFileFor.lint]);
+    runConsoleTests("min", /*parallel*/ true);
+}, { async: true });
+
+desc("Runs all the tests in parallel using the built run.js file. Optional arguments are: t[ests]=category1|category2|... d[ebug]=true.");
+task(TaskNames.runtests, [TaskNames.lib], function () {
+    tsbuild([ConfigFileFor.runjs, ConfigFileFor.lint]);
     runConsoleTests('mocha-fivemat-progress-reporter', /*runInParallel*/ false);;
-}, { async: true});
+}, { async: true });
+
+const libraryTargets = getLibraryTargets();
+desc("Builds the library targets");
+task(TaskNames.lib, libraryTargets);
+
+desc("Builds language service server library");
+task("lssl", [Paths.tsserverLibraryFile, Paths.tsserverLibraryDefinitionFile, Paths.typesMapOutput]);
+
+// Makes a new LKG. This target does not build anything, but errors if not all the outputs are present in the built/local directory
+desc("Makes a new LKG out of the built js files");
+task(TaskNames.lkg, [
+    TaskNames.clean,
+    TaskNames.release,
+    TaskNames.local,
+    ...libraryTargets
+], () => {
+    const sizeBefore = getDirSize(Paths.lkg);
+    const localizationTargets = locales.map(f => path.join(Paths.builtLocal, f)).concat(path.dirname(Paths.locLcg));
+
+    const copyrightContent = fs.readFileSync(Paths.copyright, { encoding: 'utf-8' });
+
+    const expectedFiles = [...libraryTargets, ...ExpectedLKGFiles, ...localizationTargets];
+    const missingFiles = expectedFiles.filter(f => !fs.existsSync(f));
+    if (missingFiles.length > 0) {
+        fail(new Error("Cannot replace the LKG unless all built targets are present in directory " + Paths.builtLocal +
+            ". The following files are missing:\n" + missingFiles.join("\n")));
+    }
+    // Copy all the targets into the LKG directory
+    jake.mkdirP(Paths.lkg);
+    expectedFiles.forEach(f => {
+        let content = fs.readFileSync(f, { encoding: 'utf-8' });
+
+        // If this is a .d.ts file, run remove-internal on it
+        if (f.endsWith(".d.ts")) {
+            content = removeInternal.elide(content).result;
+        }
+
+        if (f.endsWith(".d.ts") || f.endsWith(".js")) {
+            // Prepend the copyright header to it
+            content = copyrightContent + content;
+        }
+
+        fs.writeFile(path.join(Paths.lkg, path.basename(f)), content, { encoding: 'utf-8' }, (err) => {
+            if (err) throw err;
+        });
+    });
+
+    const sizeAfter = getDirSize(Paths.lkg);
+    if (sizeAfter > (sizeBefore * 1.10)) {
+        throw new Error("The lib folder increased by 10% or more. This likely indicates a bug.");
+    }
+});
+
+desc("Runs tslint on the compiler sources. Optional arguments are: f[iles]=regex");
+task(TaskNames.lint, [TaskNames.buildRules], () => {
+    if (fold.isTravis()) console.log(fold.start("lint"));
+    function lint(project, cb) {
+        const fix = process.env.fix || process.env.f;
+        const cmd = `node node_modules/tslint/bin/tslint --project ${project} --formatters-dir ./built/local/tslint/formatters --format autolinkableStylish${fix ? " --fix" : ""}`;
+        console.log("Linting: " + cmd);
+        jake.exec([cmd], cb, /** @type {jake.ExecOptions} */({ interactive: true, windowsVerbatimArguments: true }));
+    }
+    lint("scripts/tslint/tsconfig.json", () => lint("src/tsconfig-base.json", () => {
+        if (fold.isTravis()) console.log(fold.end("lint"));
+        complete();
+    }));
+});
+
+desc("Diffs the compiler baselines using the diff tool specified by the 'DIFF' environment variable");
+task('diff', function () {
+    var cmd = `"${getDiffTool()} ${Paths.baselines.reference} ${Paths.baselines.local}`;
+    console.log(cmd);
+    exec(cmd);
+}, { async: true });
+
+desc("Diffs the RWC baselines using the diff tool specified by the 'DIFF' environment variable");
+task('diff-rwc', function () {
+    var cmd = `"${getDiffTool()} ${Paths.baselines.referenceRwc} ${Paths.baselines.localRwc}`;
+    console.log(cmd);
+    exec(cmd);
+}, { async: true });
+
+desc("Sets the release mode flag");
+task("release", function () {
+    useDebugMode = false;
+});
+
+desc("Clears the release mode flag");
+task("setDebugMode", function () {
+    useDebugMode = true;
+});
+
+desc("Emit the start of the build fold");
+task(TaskNames.buildFoldStart, [], function () {
+    if (fold.isTravis()) console.log(fold.start("build"));
+});
+
+desc("Emit the end of the build fold");
+task(TaskNames.buildFoldEnd, [], function () {
+    if (fold.isTravis()) console.log(fold.end("build"));
+});
 
 desc("Compiles tslint rules to js");
-task(TaskNames.buildRules, [], function() {
+task(TaskNames.buildRules, [], function () {
     tsbuild(ConfigFileFor.lint);
 }, { async: true });
 
 desc("Cleans the compiler output, declare files, and tests");
-task("clean", function () {
-    jake.rmRf(Paths.built);;
+task(TaskNames.clean, function () {
+    jake.rmRf(Paths.built);
 });
 
+desc("Generates a diagnostic file in TypeScript based on an input JSON file");
+task(TaskNames.generateDiagnostics, [Paths.diagnosticInformationMap]);
+
+task(TaskNames.coreBuild, function () {
+    tsbuild(ConfigFileFor.all);
+});
+
+file(Paths.diagnosticMessagesJson);
+file(Paths.diagnosticInformationMap, [Paths.diagnosticMessagesJson], function (complete) {
+    tsbuild("scripts/processDiagnosticMessages.tsconfig.json", /*lkg*/ true, function () {
+        const cmd = `${host} scripts/processDiagnosticMessages.js ${Paths.diagnosticMessagesJson}`;
+        console.log(cmd);
+        var ex = jake.createExec([cmd]);
+        // Add listeners for output and error
+        ex.addListener("stdout", function (output) {
+            process.stdout.write(output);
+        });
+        ex.addListener("stderr", function (error) {
+            process.stderr.write(error);
+        });
+        ex.addListener("cmdEnd", function () {
+            complete();
+        });
+        ex.run();
+    });
+}, { async: true });
+
+file(Paths.typesMapOutput, /** @type {*} */(function () {
+    var content = fs.readFileSync(path.join(Paths.srcServer, 'typesMap.json'));
+    // Validate that it's valid JSON
+    try {
+        JSON.parse(content.toString());
+    } catch (e) {
+        console.log("Parse error in typesMap.json: " + e);
+    }
+    fs.writeFileSync(Paths.typesMapOutput, content);
+}));
+
+file(Paths.tsserverLibraryDefinitionFile, [TaskNames.coreBuild, Paths.copyright, ...libraryTargets], function () {
+    const content = fs.readFileSync(Paths.tsserverLibraryDefinitionFile, { encoding: 'utf-8' });
+    const newContent =
+        removeConstModifierFromEnumDeclarations(content) +
+        `\nexport = ts` +
+        `\nexport as namespace ts;`;
+
+    fs.writeFileSync(Paths.tsserverLibraryDefinitionFile, newContent, { encoding: 'utf-8' });
+});
+
+function getLibraryTargets() {
+    return libraries.libs.map(function (lib) {
+        var relativeSources = ["header.d.ts"].concat(libraries.sources && libraries.sources[lib] || [lib + ".d.ts"]);
+        var relativeTarget = libraries.paths && libraries.paths[lib] || ("lib." + lib + ".d.ts");
+        var sources = [Paths.copyright].concat(relativeSources.map(s => path.join(Paths.library, s)));
+        var target = path.join(Paths.builtLocal, relativeTarget);
+        file(target, [Paths.builtLocal].concat(sources), function () {
+            concatenateFiles(target, sources);
+        });
+        return target;
+    });
+}
+
 function runConsoleTests(defaultReporter, runInParallel) {
     var dirty = process.env.dirty;
     if (!dirty) {
@@ -236,11 +467,11 @@ function cleanTestDirs() {
     jake.mkdirP(Paths.baselines.localTest262);
 }
 
-function tsbuild(tsconfigPath, useLkg = false) {
+function tsbuild(tsconfigPath, useLkg = true, done = undefined) {
     const startCompileTime = Travis.mark();
 
     const compilerPath = useLkg ? Paths.lkgCompiler : Paths.builtLocalCompiler;
-    const cmd = `${host} ${compilerPath} -b -v ${tsconfigPath}`;
+    const cmd = `${host} ${compilerPath} -b -v ${Array.isArray(tsconfigPath) ? tsconfigPath.join(" ") : tsconfigPath}`;
 
     var ex = jake.createExec([cmd]);
     // Add listeners for output and error
@@ -264,7 +495,7 @@ function tsbuild(tsconfigPath, useLkg = false) {
         */
 
         Travis.measure(startCompileTime);
-        complete();
+        done && done();
     });
     ex.addListener("error", function () {
         fail(`Compilation of ${tsconfigPath} unsuccessful`);
@@ -321,4 +552,63 @@ function exec(cmd, completeHandler, errorHandler) {
     });
 
     ex.run();
-}
\ No newline at end of file
+}
+
+/** @param jsonPath {string} */
+function readJson(jsonPath) {
+    const jsonText = fs.readFileSync(jsonPath, "utf8");
+    const result = ts.parseConfigFileTextToJson(jsonPath, jsonText);
+    if (result.error) {
+        reportDiagnostics([result.error]);
+        throw new Error("An error occurred during parse.");
+    }
+    return result.config;
+}
+
+/** @param diagnostics {ts.Diagnostic[]} */
+function reportDiagnostics(diagnostics) {
+    console.log(diagnosticsToString(diagnostics, process.stdout.isTTY));
+}
+
+/**
+ * @param diagnostics {ts.Diagnostic[]}
+ * @param [pretty] {boolean}
+ */
+function diagnosticsToString(diagnostics, pretty) {
+    const host = {
+        getCurrentDirectory() { return process.cwd(); },
+        getCanonicalFileName(fileName) { return fileName; },
+        getNewLine() { return os.EOL; }
+    };
+    return pretty ? ts.formatDiagnosticsWithColorAndContext(diagnostics, host) :
+        ts.formatDiagnostics(diagnostics, host);
+}
+
+// concatenate a list of sourceFiles to a destinationFile
+function concatenateFiles(destinationFile, sourceFiles) {
+    var temp = "temptemp";
+    // append all files in sequence
+    var text = "";
+    for (var i = 0; i < sourceFiles.length; i++) {
+        if (!fs.existsSync(sourceFiles[i])) {
+            fail(sourceFiles[i] + " does not exist!");
+        }
+        if (i > 0) { text += "\n\n"; }
+        text += fs.readFileSync(sourceFiles[i]).toString().replace(/\r?\n/g, "\n");
+    }
+    fs.writeFileSync(temp, text);
+    // Move the file to the final destination
+    fs.renameSync(temp, destinationFile);
+}
+
+function getDiffTool() {
+    var program = process.env['DIFF'];
+    if (!program) {
+        fail("Add the 'DIFF' environment variable to the path of the program you want to use.");
+    }
+    return program;
+}
+
+function removeConstModifierFromEnumDeclarations(text) {
+    return text.replace(/^(\s*)(export )?const enum (\S+) {(\s*)$/gm, '$1$2enum $3 {$4');
+}
diff --git a/package.json b/package.json
index a7eb0dfd389..95dc4859082 100644
--- a/package.json
+++ b/package.json
@@ -75,6 +75,7 @@
         "mocha": "latest",
         "mocha-fivemat-progress-reporter": "latest",
         "q": "latest",
+        "remove-internal": "^2.9.2",
         "run-sequence": "latest",
         "sorcery": "latest",
         "source-map-support": "latest",
diff --git a/scripts/processDiagnosticMessages.ts b/scripts/processDiagnosticMessages.ts
index 6318b131309..04893eb38e3 100644
--- a/scripts/processDiagnosticMessages.ts
+++ b/scripts/processDiagnosticMessages.ts
@@ -1,3 +1,6 @@
+import path = require("path");
+import fs = require("fs");
+
 interface DiagnosticDetails {
     category: string;
     code: number;
@@ -5,32 +8,36 @@ interface DiagnosticDetails {
     isEarly?: boolean;
 }
 
-type InputDiagnosticMessageTable = ts.Map<DiagnosticDetails>;
+type InputDiagnosticMessageTable = Map<string, DiagnosticDetails>;
 
 function main(): void {
-    const sys = ts.sys;
-    if (sys.args.length < 1) {
-        sys.write("Usage:" + sys.newLine);
-        sys.write("\tnode processDiagnosticMessages.js <diagnostic-json-input-file>" + sys.newLine);
+    if (process.argv.length < 3) {
+        console.log("Usage:");
+        console.log("\tnode processDiagnosticMessages.js <diagnostic-json-input-file>");
         return;
     }
 
     function writeFile(fileName: string, contents: string) {
-        const inputDirectory = ts.getDirectoryPath(inputFilePath);
-        const fileOutputPath = ts.combinePaths(inputDirectory, fileName);
-        sys.writeFile(fileOutputPath, contents);
+        fs.writeFile(path.join(path.dirname(inputFilePath), fileName), contents, { encoding: "utf-8" }, err => {
+            if (err) throw err;
+        })
     }
 
-    const inputFilePath = sys.args[0].replace(/\\/g, "/");
-    const inputStr = sys.readFile(inputFilePath)!;
+    const inputFilePath = process.argv[2].replace(/\\/g, "/");
+    console.log(`Reading diagnostics from ${inputFilePath}`);
+    const inputStr = fs.readFileSync(inputFilePath, { encoding: "utf-8" });
 
     const diagnosticMessagesJson: { [key: string]: DiagnosticDetails } = JSON.parse(inputStr);
 
-    const diagnosticMessages: InputDiagnosticMessageTable = ts.createMapFromTemplate(diagnosticMessagesJson);
+    const diagnosticMessages: InputDiagnosticMessageTable = new Map();
+    for (const key in diagnosticMessagesJson) {
+        if (Object.hasOwnProperty.call(diagnosticMessagesJson, key)) {
+            diagnosticMessages.set(key, diagnosticMessagesJson[key]);
+        }
+    }
 
-    const outputFilesDir = ts.getDirectoryPath(inputFilePath);
-    const thisFilePathRel = ts.getRelativePathToDirectoryOrUrl(outputFilesDir, sys.getExecutingFilePath(),
-        sys.getCurrentDirectory(), ts.createGetCanonicalFileName(sys.useCaseSensitiveFileNames), /* isAbsolutePathAnUrl */ false);
+    const outputFilesDir = path.dirname(inputFilePath);
+    const thisFilePathRel = path.relative(process.cwd(), outputFilesDir);
 
     const infoFileOutput = buildInfoFileOutput(diagnosticMessages, "./diagnosticInformationMap.generated.ts", thisFilePathRel);
     checkForUniqueCodes(diagnosticMessages);
diff --git a/scripts/processDiagnosticMessages.tsconfig.json b/scripts/processDiagnosticMessages.tsconfig.json
index 5675c8783b9..e3ae1eb5ca8 100644
--- a/scripts/processDiagnosticMessages.tsconfig.json
+++ b/scripts/processDiagnosticMessages.tsconfig.json
@@ -1,20 +1,15 @@
 {
     "compilerOptions": {
         "removeComments": false,
-        "outFile": "processDiagnosticMessages.js",
         "target": "es5",
         "declaration": false,
         "lib": [
             "es6",
             "scripthost"
-        ]
+        ],
+        "types": ["node"]
     },
     "files": [
-        "../src/compiler/types.ts",
-        "../src/compiler/performance.ts",
-        "../src/compiler/core.ts",
-        "../src/compiler/sys.ts",
-
         "processDiagnosticMessages.ts"
     ]
 }
diff --git a/scripts/tslint/tsconfig.json b/scripts/tslint/tsconfig.json
index 79ec67c3ad6..045abc24f6b 100644
--- a/scripts/tslint/tsconfig.json
+++ b/scripts/tslint/tsconfig.json
@@ -10,6 +10,10 @@
 		"noUnusedParameters": true,
 		"strictNullChecks": true,
 		"module": "commonjs",
-		"outDir": "../../built/local/tslint"
+		"outDir": "../../built/local/tslint",
+		"baseUrl": "../..",
+		"paths": {
+			"typescript": ["lib/typescript.d.ts"]
+		}
 	}
 }
\ No newline at end of file
diff --git a/src/cancellationToken/tsconfig.json b/src/cancellationToken/tsconfig.json
index 45795320796..24482589572 100644
--- a/src/cancellationToken/tsconfig.json
+++ b/src/cancellationToken/tsconfig.json
@@ -1,7 +1,7 @@
 {
     "extends": "../tsconfig-base",
     "compilerOptions": {
-        "outDir": "../built/local/",
+        "outDir": "../../built/local/",
         "composite": false,
         "declaration": false,
         "removeComments": true,
diff --git a/src/harness/tsconfig.json b/src/harness/tsconfig.json
index 99c36e7f01e..a2f12e244af 100644
--- a/src/harness/tsconfig.json
+++ b/src/harness/tsconfig.json
@@ -1,7 +1,7 @@
 {
     "extends": "../tsconfig-base",
     "compilerOptions": {
-        "outFile": "../built/local/harness.js",
+        "outFile": "../../built/local/harness.js",
         "types": [
             "node", "mocha", "chai"
         ],
@@ -16,7 +16,7 @@
         { "path": "../compiler" },
         { "path": "../services" },
         { "path": "../server" },
-        { "path": "../typingsInstallerCore" },
+        { "path": "../typingsInstallerCore" }
     ],
 
     "files": [
diff --git a/src/parser/diagnosticInformationMap.generated.ts b/src/parser/diagnosticInformationMap.generated.ts
index 55d7e087b8a..08a4709d681 100644
--- a/src/parser/diagnosticInformationMap.generated.ts
+++ b/src/parser/diagnosticInformationMap.generated.ts
@@ -1,5 +1,5 @@
 // <auto-generated />
-// generated from './diagnosticInformationMap.generated.ts' by '../../scripts/processDiagnosticMessages.js'
+// generated from './diagnosticInformationMap.generated.ts' by 'src\parser'
 /* @internal */
 namespace ts {
     function diag(code: number, category: DiagnosticCategory, key: string, message: string, reportsUnnecessary?: {}): DiagnosticMessage {
diff --git a/src/tsc/tsconfig.json b/src/tsc/tsconfig.json
index 675a9d5a8b7..630e9472109 100644
--- a/src/tsc/tsconfig.json
+++ b/src/tsc/tsconfig.json
@@ -8,6 +8,7 @@
     ],
     "references": [
         { "path": "../core", "prepend": true },
+        { "path": "../parser", "prepend": true },
         { "path": "../compiler", "prepend": true }
     ]
 }
diff --git a/src/tsconfig.json b/src/tsconfig.json
index abb0f16132f..0c7f0c65da0 100644
--- a/src/tsconfig.json
+++ b/src/tsconfig.json
@@ -2,6 +2,11 @@
     "files": [],
     "include": [],
     "references": [
-        { "path": "./tsc" }
+        { "path": "./tsc" },
+        { "path": "./tsserver" },
+        { "path": "./typingsInstaller" },
+        { "path": "./watchGuard" },
+        { "path": "./cancellationToken" },
+        { "path": "./testRunner" }
     ]
 }
\ No newline at end of file
diff --git a/src/tsserver/tsconfig.json b/src/tsserver/tsconfig.json
index 8c908f31f33..52d98dcf5b3 100644
--- a/src/tsserver/tsconfig.json
+++ b/src/tsserver/tsconfig.json
@@ -12,6 +12,7 @@
     ],
     "references": [
         { "path": "../core", "prepend": true },
+        { "path": "../parser", "prepend": true },
         { "path": "../compiler", "prepend": true },
         { "path": "../services", "prepend": true },
         { "path": "../server", "prepend": true }
diff --git a/src/typingsInstaller/tsconfig.json b/src/typingsInstaller/tsconfig.json
index 9b8ce1b4aa4..c3451c75a52 100644
--- a/src/typingsInstaller/tsconfig.json
+++ b/src/typingsInstaller/tsconfig.json
@@ -2,7 +2,7 @@
     "extends": "../tsconfig-base",
     "compilerOptions": {
         "removeComments": true,
-        "outFile": "../built/local/typingsInstaller.js",
+        "outFile": "../../built/local/typingsInstaller.js",
         "types": [
             "node"
         ],
diff --git a/src/watchGuard/tsconfig.json b/src/watchGuard/tsconfig.json
index 8a865c65c27..7262a5db58e 100644
--- a/src/watchGuard/tsconfig.json
+++ b/src/watchGuard/tsconfig.json
@@ -2,7 +2,7 @@
     "extends": "../tsconfig-base",
     "compilerOptions": {
         "removeComments": true,
-        "outFile": "../built/local/watchGuard.js",
+        "outFile": "../../built/local/watchGuard.js",
         "types": [
             "node"
         ],

From 8033f2e1e12a7696b1e6743b052249bcd03b1587 Mon Sep 17 00:00:00 2001
From: Ryan Cavanaugh <the.ryan.cavanaugh@gmail.com>
Date: Sun, 10 Jun 2018 10:59:03 -0700
Subject: [PATCH 19/37] Revert the jakefile

---
 Jakefile.js | 1341 +++++++++++++++++++++++++++++++++++----------------
 1 file changed, 928 insertions(+), 413 deletions(-)

diff --git a/Jakefile.js b/Jakefile.js
index 93f6dc528d5..a6483355c73 100644
--- a/Jakefile.js
+++ b/Jakefile.js
@@ -2,253 +2,262 @@
 // @ts-check
 /// <reference types="jake" />
 
-const fs = require("fs");
-const os = require("os");
-const path = require("path");
-const child_process = require("child_process");
-const removeInternal = require("remove-internal");
-const fold = require("travis-fold");
-const ts = require("./lib/typescript");
-const del = require("del");
+var fs = require("fs");
+var os = require("os");
+var path = require("path");
+var child_process = require("child_process");
+var fold = require("travis-fold");
+var ts = require("./lib/typescript");
 const getDirSize = require("./scripts/build/getDirSize");
 
-const host = process.env.TYPESCRIPT_HOST || process.env.host || "node";
+// Variables
+var compilerDirectory = "src/compiler/";
+var serverDirectory = "src/server/";
+var harnessDirectory = "src/harness/";
+var libraryDirectory = "src/lib/";
+var scriptsDirectory = "scripts/";
+var unittestsDirectory = "src/harness/unittests/";
+var docDirectory = "doc/";
+var lclDirectory = "src/loc/lcl";
 
-const locales = ["cs", "de", "es", "fr", "it", "ja", "ko", "pl", "pt-br", "ru", "tr", "zh-cn", "zh-tw"];
+var builtDirectory = "built/";
+var builtLocalDirectory = "built/local/";
+var LKGDirectory = "lib/";
 
-const defaultTestTimeout = 40000;
+var copyright = "CopyrightNotice.txt";
+var thirdParty = "ThirdPartyNoticeText.txt";
 
-let useDebugMode = true;
+var defaultTestTimeout = 40000;
 
-const TaskNames = {
-    local: "local",
-    runtests: "runtests",
-    runtestsParallel: "runtests-parallel",
-    buildRules: "build-rules",
-    clean: "clean",
-    lib: "lib",
-    buildFoldStart: "build-fold-start",
-    buildFoldEnd: "build-fold-end",
-    generateDiagnostics: "generate-diagnostics",
-    coreBuild: "core-build",
-    lkg: "LKG",
-    release: "release",
-    lssl: "lssl",
-    lint: "lint"
-};
+// add node_modules to path so we don't need global modules, prefer the modules by adding them first
+var nodeModulesPathPrefix = path.resolve("./node_modules/.bin/") + path.delimiter;
+if (process.env.path !== undefined) {
+    process.env.path = nodeModulesPathPrefix + process.env.path;
+}
+else if (process.env.PATH !== undefined) {
+    process.env.PATH = nodeModulesPathPrefix + process.env.PATH;
+}
 
-const Paths = {
-    lkg: "lib",
-    lkgCompiler: "lib/tsc.js",
+/**
+ * @param diagnostics {ts.Diagnostic[]}
+ * @param [pretty] {boolean}
+ */
+function diagnosticsToString(diagnostics, pretty) {
+    const host = {
+        getCurrentDirectory() { return process.cwd(); },
+        getCanonicalFileName(fileName) { return fileName; },
+        getNewLine() { return os.EOL; }
+    };
+    return pretty ? ts.formatDiagnosticsWithColorAndContext(diagnostics, host) :
+        ts.formatDiagnostics(diagnostics, host);
+}
 
-    built: "built",
-    builtLocal: "built/local",
-    builtLocalCompiler: "built/local/tsc.js",
-    builtLocalRun: "built/local/run.js",
-    locLcg: "built/local/enu/diagnosticMessages.generated.json.lcg",
-    typesMapOutput: "built/local/typesMap.json",
-    servicesFile: "built/local/typescriptServices.js",
-    servicesDefinitionFile: "built/local/typescriptServices.d.ts",
-    tsserverLibraryFile: "built/local/tsserverlibrary.js",
-    tsserverLibraryDefinitionFile: "built/local/tsserverlibrary.d.ts",
+/** @param diagnostics {ts.Diagnostic[]} */
+function reportDiagnostics(diagnostics) {
+    console.log(diagnosticsToString(diagnostics, process.stdout.isTTY));
+}
 
-    baselines: {
-        local: "tests/baselines/local",
-        localTest262: "tests/baselines/test262/local",
-        localRwc: "tests/baselines/rwc/local",
-        reference: "tests/baselines/reference",
-        referenceTest262: "tests/baselines/test262/reference",
-        referenceRwc: "tests/baselines/rwc/reference"
-    },
-    copyright: "CopyrightNotice.txt",
-    thirdParty: "ThirdPartyNoticeText.txt",
-    library: "src/lib",
+/** @param jsonPath {string} */
+function readJson(jsonPath) {
+    const jsonText = fs.readFileSync(jsonPath, "utf8");
+    const result = ts.parseConfigFileTextToJson(jsonPath, jsonText);
+    if (result.error) {
+        reportDiagnostics([result.error]);
+        throw new Error("An error occurred during parse.");
+    }
+    return result.config;
+}
 
-    processDiagnosticMessagesJs: "scripts/processDiagnosticMessages.js",
-    diagnosticInformationMap: "src/parser/diagnosticInformationMap.generated.ts",
-    diagnosticMessagesJson: "src/parser/diagnosticMessages.json",
+/** @param configPath {string} */
+function filesFromConfig(configPath) {
+    const config = readJson(configPath);
+    const configFileContent = ts.parseJsonConfigFileContent(config, ts.sys, path.dirname(configPath));
+    if (configFileContent.errors && configFileContent.errors.length) {
+        reportDiagnostics(configFileContent.errors);
+        throw new Error("An error occurred during parse.");
+    }
+    return configFileContent.fileNames;
+}
 
-    srcServer: "src/server",
+function toNs(diff) {
+    return diff[0] * 1e9 + diff[1];
+}
 
-};
+function mark() {
+    if (!fold.isTravis()) return;
+    var stamp = process.hrtime();
+    var id = Math.floor(Math.random() * 0xFFFFFFFF).toString(16);
+    console.log("travis_time:start:" + id + "\r");
+    return {
+        stamp: stamp,
+        id: id
+    };
+}
 
-const ConfigFileFor = {
-    tsc: "src/tsc",
-    tsserver: "src/tsserver",
-    runjs: "src/testRunner",
-    lint: "scripts/tslint",
-    all: "src"
-};
+function measure(marker) {
+    if (!fold.isTravis()) return;
+    var diff = process.hrtime(marker.stamp);
+    var total = [marker.stamp[0] + diff[0], marker.stamp[1] + diff[1]];
+    console.log("travis_time:end:" + marker.id + ":start=" + toNs(marker.stamp) + ",finish=" + toNs(total) + ",duration=" + toNs(diff) + "\r");
+}
 
-const ExpectedLKGFiles = [
-    "tsc.js",
-    "tsserver.js",
-    "typescriptServices.js",
-    "typescriptServices.d.ts",
-    "typescript.js",
-    "typescript.d.ts",
-    "tsserverlibrary.js",
-    "tsserverlibrary.d.js",
-    "cancellationToken.js",
-    "typingsInstaller.js",
-    "protocol.d.ts",
-    "watchGuard.js"
-];
+function removeConstModifierFromEnumDeclarations(text) {
+     return text.replace(/^(\s*)(export )?const enum (\S+) {(\s*)$/gm, '$1$2enum $3 {$4');
+}
+
+var compilerSources = filesFromConfig("./src/compiler/tsconfig.json");
+var servicesSources = filesFromConfig("./src/services/tsconfig.json");
+var cancellationTokenSources = filesFromConfig(path.join(serverDirectory, "cancellationToken/tsconfig.json"));
+var typingsInstallerSources = filesFromConfig(path.join(serverDirectory, "typingsInstaller/tsconfig.json"));
+var watchGuardSources = filesFromConfig(path.join(serverDirectory, "watchGuard/tsconfig.json"));
+var serverSources = filesFromConfig(path.join(serverDirectory, "tsconfig.json"));
+var languageServiceLibrarySources = filesFromConfig(path.join(serverDirectory, "tsconfig.library.json"));
+var harnessSources = filesFromConfig("./src/harness/tsconfig.json");
+
+var typesMapOutputPath = path.join(builtLocalDirectory, 'typesMap.json');
 
 /** @type {{ libs: string[], paths?: Record<string, string>, sources?: Record<string, string[]> }} */
-const libraries = readJson("./src/lib/libs.json");
+var libraries = readJson("./src/lib/libs.json");
 
-directory(Paths.builtLocal);
+/**
+ * .lcg file is what localization team uses to know what messages to localize.
+ * The file is always generated in 'enu\diagnosticMessages.generated.json.lcg'
+ */
+var generatedLCGFile = path.join(builtLocalDirectory, "enu", "diagnosticMessages.generated.json.lcg");
 
-// Local target to build the compiler and services
-desc("Builds the full compiler and services");
-task(TaskNames.local, [
-    TaskNames.buildFoldStart,
-    TaskNames.generateDiagnostics,
-    TaskNames.lib,
-    TaskNames.coreBuild,
-    // buildProtocolDts,
-    // builtGeneratedDiagnosticMessagesJSON,
-    TaskNames.lssl,
-    // "localize",
-    TaskNames.buildFoldEnd
-]);
+/**
+ * The localization target produces the two following transformations:
+ *    1. 'src\loc\lcl\<locale>\diagnosticMessages.generated.json.lcl' => 'built\local\<locale>\diagnosticMessages.generated.json'
+ *       convert localized resources into a .json file the compiler can understand
+ *    2. 'src\compiler\diagnosticMessages.generated.json' => 'built\local\ENU\diagnosticMessages.generated.json.lcg'
+ *       generate the lcg file (source of messages to localize) from the diagnosticMessages.generated.json
+ */
+var localizationTargets = ["cs", "de", "es", "fr", "it", "ja", "ko", "pl", "pt-br", "ru", "tr", "zh-cn", "zh-tw"].map(function (f) {
+    return path.join(builtLocalDirectory, f);
+}).concat(path.dirname(generatedLCGFile));
 
-desc("Runs all the tests in parallel using the built run.js file. Optional arguments are: t[ests]=category1|category2|... d[ebug]=true.");
-task(TaskNames.runtestsParallel, [TaskNames.lib], function () {
-    tsbuild([ConfigFileFor.runjs, ConfigFileFor.lint]);
-    runConsoleTests("min", /*parallel*/ true);
-}, { async: true });
-
-desc("Runs all the tests in parallel using the built run.js file. Optional arguments are: t[ests]=category1|category2|... d[ebug]=true.");
-task(TaskNames.runtests, [TaskNames.lib], function () {
-    tsbuild([ConfigFileFor.runjs, ConfigFileFor.lint]);
-    runConsoleTests('mocha-fivemat-progress-reporter', /*runInParallel*/ false);;
-}, { async: true });
-
-const libraryTargets = getLibraryTargets();
-desc("Builds the library targets");
-task(TaskNames.lib, libraryTargets);
-
-desc("Builds language service server library");
-task("lssl", [Paths.tsserverLibraryFile, Paths.tsserverLibraryDefinitionFile, Paths.typesMapOutput]);
-
-// Makes a new LKG. This target does not build anything, but errors if not all the outputs are present in the built/local directory
-desc("Makes a new LKG out of the built js files");
-task(TaskNames.lkg, [
-    TaskNames.clean,
-    TaskNames.release,
-    TaskNames.local,
-    ...libraryTargets
-], () => {
-    const sizeBefore = getDirSize(Paths.lkg);
-    const localizationTargets = locales.map(f => path.join(Paths.builtLocal, f)).concat(path.dirname(Paths.locLcg));
-
-    const copyrightContent = fs.readFileSync(Paths.copyright, { encoding: 'utf-8' });
-
-    const expectedFiles = [...libraryTargets, ...ExpectedLKGFiles, ...localizationTargets];
-    const missingFiles = expectedFiles.filter(f => !fs.existsSync(f));
-    if (missingFiles.length > 0) {
-        fail(new Error("Cannot replace the LKG unless all built targets are present in directory " + Paths.builtLocal +
-            ". The following files are missing:\n" + missingFiles.join("\n")));
+// Prepends the contents of prefixFile to destinationFile
+function prependFile(prefixFile, destinationFile) {
+    if (!fs.existsSync(prefixFile)) {
+        fail(prefixFile + " does not exist!");
     }
-    // Copy all the targets into the LKG directory
-    jake.mkdirP(Paths.lkg);
-    expectedFiles.forEach(f => {
-        let content = fs.readFileSync(f, { encoding: 'utf-8' });
+    if (!fs.existsSync(destinationFile)) {
+        fail(destinationFile + " failed to be created!");
+    }
+    var temp = "temptemp";
+    jake.cpR(prefixFile, temp, { silent: true });
+    fs.appendFileSync(temp, fs.readFileSync(destinationFile));
+    fs.renameSync(temp, destinationFile);
+}
 
-        // If this is a .d.ts file, run remove-internal on it
-        if (f.endsWith(".d.ts")) {
-            content = removeInternal.elide(content).result;
+// concatenate a list of sourceFiles to a destinationFile
+function concatenateFiles(destinationFile, sourceFiles) {
+    var temp = "temptemp";
+    // append all files in sequence
+    var text = "";
+    for (var i = 0; i < sourceFiles.length; i++) {
+        if (!fs.existsSync(sourceFiles[i])) {
+            fail(sourceFiles[i] + " does not exist!");
+        }
+        if (i > 0) { text += "\n\n"; }
+        text += fs.readFileSync(sourceFiles[i]).toString().replace(/\r?\n/g, "\n");
+    }
+    fs.writeFileSync(temp, text);
+    // Move the file to the final destination
+    fs.renameSync(temp, destinationFile);
+}
+
+var useDebugMode = true;
+var host = process.env.TYPESCRIPT_HOST || process.env.host || "node";
+var compilerFilename = "tsc.js";
+var LKGCompiler = path.join(LKGDirectory, compilerFilename);
+var builtLocalCompiler = path.join(builtLocalDirectory, compilerFilename);
+
+/**
+ * Compiles a file from a list of sources
+ * @param {string} outFile the target file name
+ * @param {string[]} sources an array of the names of the source files
+ * @param {string[]} prereqs prerequisite tasks to compiling the file
+ * @param {string[]} prefixes a list of files to prepend to the target file
+ * @param {boolean} useBuiltCompiler true to use the built compiler, false to use the LKG
+ * @param {object} [opts] property bag containing auxiliary options
+ * @param {boolean} [opts.noOutFile] true to compile without using --out
+ * @param {boolean} [opts.generateDeclarations] true to compile using --declaration
+ * @param {string} [opts.outDir] value for '--outDir' command line option
+ * @param {boolean} [opts.keepComments] false to compile using --removeComments
+ * @param {boolean} [opts.preserveConstEnums] true if compiler should keep const enums in code
+ * @param {boolean} [opts.noResolve] true if compiler should not include non-rooted files in compilation
+ * @param {boolean} [opts.stripInternal] true if compiler should remove declarations marked as internal
+ * @param {boolean} [opts.inlineSourceMap] true if compiler should inline sourceMap
+ * @param {string[]} [opts.types] array of types to include in compilation
+ * @param {string} [opts.lib] explicit libs to include.
+ * @param {function(): void} [callback] a function to execute after the compilation process ends
+ */
+function compileFile(outFile, sources, prereqs, prefixes, useBuiltCompiler, opts, callback) {
+    file(outFile, prereqs, function() {
+        var startCompileTime = mark();
+        opts = opts || {};
+        var compilerPath = useBuiltCompiler ? builtLocalCompiler : LKGCompiler;
+        var options = "--noImplicitAny --noImplicitThis --alwaysStrict --noEmitOnError";
+        if (opts.types) {
+            options += " --types " + opts.types.join(",");
+        }
+        options += " --pretty";
+        // Keep comments when specifically requested
+        // or when in debug mode.
+        if (!(opts.keepComments || useDebugMode)) {
+            options += " --removeComments";
         }
 
-        if (f.endsWith(".d.ts") || f.endsWith(".js")) {
-            // Prepend the copyright header to it
-            content = copyrightContent + content;
+        if (opts.generateDeclarations) {
+            options += " --declaration";
         }
 
-        fs.writeFile(path.join(Paths.lkg, path.basename(f)), content, { encoding: 'utf-8' }, (err) => {
-            if (err) throw err;
-        });
-    });
+        if (opts.preserveConstEnums || useDebugMode) {
+            options += " --preserveConstEnums";
+        }
 
-    const sizeAfter = getDirSize(Paths.lkg);
-    if (sizeAfter > (sizeBefore * 1.10)) {
-        throw new Error("The lib folder increased by 10% or more. This likely indicates a bug.");
-    }
-});
+        if (opts.outDir) {
+            options += " --outDir " + opts.outDir;
+        }
 
-desc("Runs tslint on the compiler sources. Optional arguments are: f[iles]=regex");
-task(TaskNames.lint, [TaskNames.buildRules], () => {
-    if (fold.isTravis()) console.log(fold.start("lint"));
-    function lint(project, cb) {
-        const fix = process.env.fix || process.env.f;
-        const cmd = `node node_modules/tslint/bin/tslint --project ${project} --formatters-dir ./built/local/tslint/formatters --format autolinkableStylish${fix ? " --fix" : ""}`;
-        console.log("Linting: " + cmd);
-        jake.exec([cmd], cb, /** @type {jake.ExecOptions} */({ interactive: true, windowsVerbatimArguments: true }));
-    }
-    lint("scripts/tslint/tsconfig.json", () => lint("src/tsconfig-base.json", () => {
-        if (fold.isTravis()) console.log(fold.end("lint"));
-        complete();
-    }));
-});
+        if (!opts.noOutFile) {
+            options += " --out " + outFile;
+        }
+        else {
+            options += " --module commonjs";
+        }
 
-desc("Diffs the compiler baselines using the diff tool specified by the 'DIFF' environment variable");
-task('diff', function () {
-    var cmd = `"${getDiffTool()} ${Paths.baselines.reference} ${Paths.baselines.local}`;
-    console.log(cmd);
-    exec(cmd);
-}, { async: true });
+        if (opts.noResolve) {
+            options += " --noResolve";
+        }
 
-desc("Diffs the RWC baselines using the diff tool specified by the 'DIFF' environment variable");
-task('diff-rwc', function () {
-    var cmd = `"${getDiffTool()} ${Paths.baselines.referenceRwc} ${Paths.baselines.localRwc}`;
-    console.log(cmd);
-    exec(cmd);
-}, { async: true });
+        if (useDebugMode) {
+            if (opts.inlineSourceMap) {
+                options += " --inlineSourceMap --inlineSources";
+            }
+            else {
+                options += " --sourcemap";
+            }
+        }
+        options += " --newLine LF";
 
-desc("Sets the release mode flag");
-task("release", function () {
-    useDebugMode = false;
-});
+        if (opts.stripInternal) {
+            options += " --stripInternal";
+        }
+        options +=  " --target es5";
+        if (opts.lib) {
+            options += " --lib " + opts.lib;
+        }
+        else {
+            options += " --lib es5";
+        }
+        options += " --noUnusedLocals --noUnusedParameters --strictNullChecks";
 
-desc("Clears the release mode flag");
-task("setDebugMode", function () {
-    useDebugMode = true;
-});
+        var cmd = host + " " + compilerPath + " " + options + " ";
+        cmd = cmd + sources.join(" ");
+        console.log(cmd + "\n");
 
-desc("Emit the start of the build fold");
-task(TaskNames.buildFoldStart, [], function () {
-    if (fold.isTravis()) console.log(fold.start("build"));
-});
-
-desc("Emit the end of the build fold");
-task(TaskNames.buildFoldEnd, [], function () {
-    if (fold.isTravis()) console.log(fold.end("build"));
-});
-
-desc("Compiles tslint rules to js");
-task(TaskNames.buildRules, [], function () {
-    tsbuild(ConfigFileFor.lint);
-}, { async: true });
-
-desc("Cleans the compiler output, declare files, and tests");
-task(TaskNames.clean, function () {
-    jake.rmRf(Paths.built);
-});
-
-desc("Generates a diagnostic file in TypeScript based on an input JSON file");
-task(TaskNames.generateDiagnostics, [Paths.diagnosticInformationMap]);
-
-task(TaskNames.coreBuild, function () {
-    tsbuild(ConfigFileFor.all);
-});
-
-file(Paths.diagnosticMessagesJson);
-file(Paths.diagnosticInformationMap, [Paths.diagnosticMessagesJson], function (complete) {
-    tsbuild("scripts/processDiagnosticMessages.tsconfig.json", /*lkg*/ true, function () {
-        const cmd = `${host} scripts/processDiagnosticMessages.js ${Paths.diagnosticMessagesJson}`;
-        console.log(cmd);
         var ex = jake.createExec([cmd]);
         // Add listeners for output and error
         ex.addListener("stdout", function (output) {
@@ -258,44 +267,492 @@ file(Paths.diagnosticInformationMap, [Paths.diagnosticMessagesJson], function (c
             process.stderr.write(error);
         });
         ex.addListener("cmdEnd", function () {
+            if (!useDebugMode && prefixes && fs.existsSync(outFile)) {
+                for (var i in prefixes) {
+                    prependFile(prefixes[i], outFile);
+                }
+            }
+
+            if (callback) {
+                callback();
+            }
+
+            measure(startCompileTime);
             complete();
         });
+        ex.addListener("error", function () {
+            fs.unlinkSync(outFile);
+            fail("Compilation of " + outFile + " unsuccessful");
+            measure(startCompileTime);
+        });
         ex.run();
+    }, { async: true });
+}
+
+// Prerequisite task for built directory and library typings
+directory(builtLocalDirectory);
+
+var libraryTargets = libraries.libs.map(function (lib) {
+    var relativeSources = ["header.d.ts"].concat(libraries.sources && libraries.sources[lib] || [lib + ".d.ts"]);
+    var relativeTarget = libraries.paths && libraries.paths[lib] || ("lib." + lib + ".d.ts");
+    var sources = [copyright].concat(relativeSources.map(s => path.join(libraryDirectory, s)));
+    var target = path.join(builtLocalDirectory, relativeTarget);
+    file(target, [builtLocalDirectory].concat(sources), function () {
+        concatenateFiles(target, sources);
     });
+    return target;
+});
+
+// Lib target to build the library files
+desc("Builds the library targets");
+task("lib", libraryTargets);
+
+
+// Generate diagnostics
+var processDiagnosticMessagesJs = path.join(scriptsDirectory, "processDiagnosticMessages.js");
+var processDiagnosticMessagesTs = path.join(scriptsDirectory, "processDiagnosticMessages.ts");
+var processDiagnosticMessagesSources = filesFromConfig("./scripts/processDiagnosticMessages.tsconfig.json");
+
+var diagnosticMessagesJson = path.join(compilerDirectory, "diagnosticMessages.json");
+var diagnosticInfoMapTs = path.join(compilerDirectory, "diagnosticInformationMap.generated.ts");
+var generatedDiagnosticMessagesJSON = path.join(compilerDirectory, "diagnosticMessages.generated.json");
+var builtGeneratedDiagnosticMessagesJSON = path.join(builtLocalDirectory, "diagnosticMessages.generated.json");
+
+file(processDiagnosticMessagesTs);
+
+// processDiagnosticMessages script
+compileFile(processDiagnosticMessagesJs,
+    processDiagnosticMessagesSources,
+    processDiagnosticMessagesSources,
+    [],
+    /*useBuiltCompiler*/ false);
+
+// Localize diagnostics script
+var generateLocalizedDiagnosticMessagesJs = path.join(scriptsDirectory, "generateLocalizedDiagnosticMessages.js");
+var generateLocalizedDiagnosticMessagesTs = path.join(scriptsDirectory, "generateLocalizedDiagnosticMessages.ts");
+
+file(generateLocalizedDiagnosticMessagesTs);
+
+compileFile(generateLocalizedDiagnosticMessagesJs,
+    [generateLocalizedDiagnosticMessagesTs],
+    [generateLocalizedDiagnosticMessagesTs],
+    [],
+    /*useBuiltCompiler*/ false, { noOutFile: true, types: ["node", "xml2js"] });
+
+// Localize diagnostics
+file(generatedLCGFile, [generateLocalizedDiagnosticMessagesJs, diagnosticInfoMapTs, generatedDiagnosticMessagesJSON], function () {
+    var cmd = host + " " + generateLocalizedDiagnosticMessagesJs + " " + lclDirectory + " " + builtLocalDirectory + " " + generatedDiagnosticMessagesJSON;
+    console.log(cmd);
+    var ex = jake.createExec([cmd]);
+    // Add listeners for output and error
+    ex.addListener("stdout", function (output) {
+        process.stdout.write(output);
+    });
+    ex.addListener("stderr", function (error) {
+        process.stderr.write(error);
+    });
+    ex.addListener("cmdEnd", function () {
+        complete();
+    });
+    ex.run();
 }, { async: true });
 
-file(Paths.typesMapOutput, /** @type {*} */(function () {
-    var content = fs.readFileSync(path.join(Paths.srcServer, 'typesMap.json'));
+task("localize", [generatedLCGFile]);
+
+var buildProtocolTs = path.join(scriptsDirectory, "buildProtocol.ts");
+var buildProtocolJs = path.join(scriptsDirectory, "buildProtocol.js");
+var buildProtocolDts = path.join(builtLocalDirectory, "protocol.d.ts");
+var typescriptServicesDts = path.join(builtLocalDirectory, "typescriptServices.d.ts");
+
+file(buildProtocolTs);
+
+compileFile(buildProtocolJs,
+    [buildProtocolTs],
+    [buildProtocolTs],
+    [],
+    /*useBuiltCompiler*/ false,
+    { noOutFile: true, lib: "es6" });
+
+file(buildProtocolDts, [buildProtocolTs, buildProtocolJs, typescriptServicesDts], function() {
+
+    var protocolTs = path.join(serverDirectory, "protocol.ts");
+
+    var cmd = host + " " + buildProtocolJs + " "+ protocolTs + " " + typescriptServicesDts + " " + buildProtocolDts;
+    console.log(cmd);
+    var ex = jake.createExec([cmd]);
+    // Add listeners for output and error
+    ex.addListener("stdout", function (output) {
+        process.stdout.write(output);
+    });
+    ex.addListener("stderr", function (error) {
+        process.stderr.write(error);
+    });
+    ex.addListener("cmdEnd", function () {
+        complete();
+    });
+    ex.run();
+}, { async: true });
+
+// The generated diagnostics map; built for the compiler and for the 'generate-diagnostics' task
+file(diagnosticInfoMapTs, [processDiagnosticMessagesJs, diagnosticMessagesJson], function () {
+    var cmd = host + " " + processDiagnosticMessagesJs + " " + diagnosticMessagesJson;
+    console.log(cmd);
+    var ex = jake.createExec([cmd]);
+    // Add listeners for output and error
+    ex.addListener("stdout", function (output) {
+        process.stdout.write(output);
+    });
+    ex.addListener("stderr", function (error) {
+        process.stderr.write(error);
+    });
+    ex.addListener("cmdEnd", function () {
+        complete();
+    });
+    ex.run();
+}, { async: true });
+
+file(builtGeneratedDiagnosticMessagesJSON, [generatedDiagnosticMessagesJSON], function () {
+    if (fs.existsSync(builtLocalDirectory)) {
+        jake.cpR(generatedDiagnosticMessagesJSON, builtGeneratedDiagnosticMessagesJSON);
+    }
+});
+
+desc("Generates a diagnostic file in TypeScript based on an input JSON file");
+task("generate-diagnostics", [diagnosticInfoMapTs]);
+
+// Publish nightly
+var configurePrereleaseJs = path.join(scriptsDirectory, "configurePrerelease.js");
+var configurePrereleaseTs = path.join(scriptsDirectory, "configurePrerelease.ts");
+var packageJson = "package.json";
+var versionFile = path.join(compilerDirectory, "core.ts");
+
+file(configurePrereleaseTs);
+
+compileFile(/*outfile*/configurePrereleaseJs,
+            /*sources*/[configurePrereleaseTs],
+            /*prereqs*/[configurePrereleaseTs],
+            /*prefixes*/[],
+            /*useBuiltCompiler*/ false,
+    { noOutFile: true, generateDeclarations: false, keepComments: false, noResolve: false, stripInternal: false });
+
+task("setDebugMode", function () {
+    useDebugMode = true;
+});
+
+task("configure-nightly", [configurePrereleaseJs], function () {
+    var cmd = host + " " + configurePrereleaseJs + " dev " + packageJson + " " + versionFile;
+    console.log(cmd);
+    exec(cmd);
+}, { async: true });
+
+desc("Configure, build, test, and publish the nightly release.");
+task("publish-nightly", ["configure-nightly", "LKG", "clean", "setDebugMode", "runtests-parallel"], function () {
+    var cmd = "npm publish --tag next";
+    console.log(cmd);
+    exec(cmd);
+});
+
+task("configure-insiders", [configurePrereleaseJs], function () {
+    var cmd = host + " " + configurePrereleaseJs + " insiders " + packageJson + " " + versionFile;
+    console.log(cmd);
+    exec(cmd);
+}, { async: true });
+
+desc("Configure, build, test, and publish the insiders release.");
+task("publish-insiders", ["configure-insiders", "LKG", "clean", "setDebugMode", "runtests-parallel"], function () {
+    var cmd = "npm publish --tag insiders";
+    console.log(cmd);
+    exec(cmd);
+});
+
+var importDefinitelyTypedTestsDirectory = path.join(scriptsDirectory, "importDefinitelyTypedTests");
+var importDefinitelyTypedTestsJs = path.join(importDefinitelyTypedTestsDirectory, "importDefinitelyTypedTests.js");
+var importDefinitelyTypedTestsTs = path.join(importDefinitelyTypedTestsDirectory, "importDefinitelyTypedTests.ts");
+
+file(importDefinitelyTypedTestsTs);
+file(importDefinitelyTypedTestsJs, ["tsd-scripts", importDefinitelyTypedTestsTs], function () {
+    var cmd = host + " " + LKGCompiler + " -p " + importDefinitelyTypedTestsDirectory;
+    console.log(cmd);
+    exec(cmd);
+}, { async: true });
+
+task("importDefinitelyTypedTests", [importDefinitelyTypedTestsJs], function () {
+    var cmd = host + " " + importDefinitelyTypedTestsJs + " ./ ../DefinitelyTyped";
+    console.log(cmd);
+    exec(cmd);
+}, { async: true });
+
+// Local target to build the compiler and services
+var tscFile = path.join(builtLocalDirectory, compilerFilename);
+compileFile(tscFile, compilerSources, [builtLocalDirectory, copyright].concat(compilerSources), [copyright], /*useBuiltCompiler:*/ false);
+
+var servicesFile = path.join(builtLocalDirectory, "typescriptServices.js");
+var standaloneDefinitionsFile = path.join(builtLocalDirectory, "typescriptServices.d.ts");
+var nodePackageFile = path.join(builtLocalDirectory, "typescript.js");
+var nodeDefinitionsFile = path.join(builtLocalDirectory, "typescript.d.ts");
+var nodeStandaloneDefinitionsFile = path.join(builtLocalDirectory, "typescript_standalone.d.ts");
+
+compileFile(servicesFile, servicesSources, [builtLocalDirectory, copyright].concat(servicesSources),
+            /*prefixes*/[copyright],
+            /*useBuiltCompiler*/ true,
+            /*opts*/ {
+        noOutFile: false,
+        generateDeclarations: true,
+        preserveConstEnums: true,
+        keepComments: true,
+        noResolve: false,
+        stripInternal: true
+    },
+            /*callback*/ function () {
+        jake.cpR(servicesFile, nodePackageFile, { silent: true });
+
+        prependFile(copyright, standaloneDefinitionsFile);
+
+        // Stanalone/web definition file using global 'ts' namespace
+        jake.cpR(standaloneDefinitionsFile, nodeDefinitionsFile, { silent: true });
+        var definitionFileContents = fs.readFileSync(nodeDefinitionsFile).toString();
+        definitionFileContents = removeConstModifierFromEnumDeclarations(definitionFileContents);
+        fs.writeFileSync(standaloneDefinitionsFile, definitionFileContents);
+
+        // Official node package definition file, pointed to by 'typings' in package.json
+        // Created by appending 'export = ts;' at the end of the standalone file to turn it into an external module
+        var nodeDefinitionsFileContents = definitionFileContents + "\nexport = ts;";
+        fs.writeFileSync(nodeDefinitionsFile, nodeDefinitionsFileContents);
+
+        // Node package definition file to be distributed without the package. Created by replacing
+        // 'ts' namespace with '"typescript"' as a module.
+        var nodeStandaloneDefinitionsFileContents = definitionFileContents.replace(/declare (namespace|module) ts/g, 'declare module "typescript"');
+        fs.writeFileSync(nodeStandaloneDefinitionsFile, nodeStandaloneDefinitionsFileContents);
+    });
+
+file(typescriptServicesDts, [servicesFile]);
+
+var cancellationTokenFile = path.join(builtLocalDirectory, "cancellationToken.js");
+compileFile(cancellationTokenFile, cancellationTokenSources, [builtLocalDirectory].concat(cancellationTokenSources), /*prefixes*/ [copyright], /*useBuiltCompiler*/ true, { types: ["node"], outDir: builtLocalDirectory, noOutFile: true, lib: "es6" });
+
+var typingsInstallerFile = path.join(builtLocalDirectory, "typingsInstaller.js");
+compileFile(typingsInstallerFile, typingsInstallerSources, [builtLocalDirectory].concat(typingsInstallerSources), /*prefixes*/ [copyright], /*useBuiltCompiler*/ true, { types: ["node"], outDir: builtLocalDirectory, noOutFile: false, lib: "es6" });
+
+var watchGuardFile = path.join(builtLocalDirectory, "watchGuard.js");
+compileFile(watchGuardFile, watchGuardSources, [builtLocalDirectory].concat(watchGuardSources), /*prefixes*/ [copyright], /*useBuiltCompiler*/ true, { types: ["node"], outDir: builtLocalDirectory, noOutFile: false, lib: "es6" });
+
+var serverFile = path.join(builtLocalDirectory, "tsserver.js");
+compileFile(serverFile, serverSources, [builtLocalDirectory, copyright, cancellationTokenFile, typingsInstallerFile, watchGuardFile].concat(serverSources).concat(servicesSources), /*prefixes*/ [copyright], /*useBuiltCompiler*/ true, { types: ["node"], preserveConstEnums: true, lib: "es6" });
+var tsserverLibraryFile = path.join(builtLocalDirectory, "tsserverlibrary.js");
+var tsserverLibraryDefinitionFile = path.join(builtLocalDirectory, "tsserverlibrary.d.ts");
+file(typesMapOutputPath, /** @type {*} */(function() {
+    var content = fs.readFileSync(path.join(serverDirectory, 'typesMap.json'));
     // Validate that it's valid JSON
     try {
         JSON.parse(content.toString());
     } catch (e) {
         console.log("Parse error in typesMap.json: " + e);
     }
-    fs.writeFileSync(Paths.typesMapOutput, content);
+    fs.writeFileSync(typesMapOutputPath, content);
 }));
+compileFile(
+    tsserverLibraryFile,
+    languageServiceLibrarySources,
+    [builtLocalDirectory, copyright, builtLocalCompiler].concat(languageServiceLibrarySources).concat(libraryTargets),
+    /*prefixes*/[copyright],
+    /*useBuiltCompiler*/ true,
+    { noOutFile: false, generateDeclarations: true, stripInternal: true, preserveConstEnums: true, keepComments: true },
+    /*callback*/ function () {
+        prependFile(copyright, tsserverLibraryDefinitionFile);
 
-file(Paths.tsserverLibraryDefinitionFile, [TaskNames.coreBuild, Paths.copyright, ...libraryTargets], function () {
-    const content = fs.readFileSync(Paths.tsserverLibraryDefinitionFile, { encoding: 'utf-8' });
-    const newContent =
-        removeConstModifierFromEnumDeclarations(content) +
-        `\nexport = ts` +
-        `\nexport as namespace ts;`;
+        // Appending exports at the end of the server library
+        var tsserverLibraryDefinitionFileContents =
+            fs.readFileSync(tsserverLibraryDefinitionFile).toString() +
+            "\nexport = ts;" +
+            "\nexport as namespace ts;";
+        tsserverLibraryDefinitionFileContents = removeConstModifierFromEnumDeclarations(tsserverLibraryDefinitionFileContents);
 
-    fs.writeFileSync(Paths.tsserverLibraryDefinitionFile, newContent, { encoding: 'utf-8' });
+        fs.writeFileSync(tsserverLibraryDefinitionFile, tsserverLibraryDefinitionFileContents);
+    });
+
+// Local target to build the language service server library
+desc("Builds language service server library");
+task("lssl", [tsserverLibraryFile, tsserverLibraryDefinitionFile, typesMapOutputPath]);
+
+desc("Emit the start of the build fold");
+task("build-fold-start", [], function () {
+    if (fold.isTravis()) console.log(fold.start("build"));
 });
 
-function getLibraryTargets() {
-    return libraries.libs.map(function (lib) {
-        var relativeSources = ["header.d.ts"].concat(libraries.sources && libraries.sources[lib] || [lib + ".d.ts"]);
-        var relativeTarget = libraries.paths && libraries.paths[lib] || ("lib." + lib + ".d.ts");
-        var sources = [Paths.copyright].concat(relativeSources.map(s => path.join(Paths.library, s)));
-        var target = path.join(Paths.builtLocal, relativeTarget);
-        file(target, [Paths.builtLocal].concat(sources), function () {
-            concatenateFiles(target, sources);
-        });
-        return target;
+desc("Emit the end of the build fold");
+task("build-fold-end", [], function () {
+    if (fold.isTravis()) console.log(fold.end("build"));
+});
+
+// Local target to build the compiler and services
+desc("Builds the full compiler and services");
+task("local", ["build-fold-start", "generate-diagnostics", "lib", tscFile, servicesFile, nodeDefinitionsFile, serverFile, buildProtocolDts, builtGeneratedDiagnosticMessagesJSON, "lssl", "localize", "build-fold-end"]);
+
+// Local target to build only tsc.js
+desc("Builds only the compiler");
+task("tsc", ["generate-diagnostics", "lib", tscFile]);
+
+// Local target to build the compiler and services
+desc("Sets release mode flag");
+task("release", function () {
+    useDebugMode = false;
+});
+
+// Set the default task to "local"
+task("default", ["local"]);
+
+// Cleans the built directory
+desc("Cleans the compiler output, declare files, and tests");
+task("clean", function () {
+    jake.rmRf(builtDirectory);
+});
+
+// Generate Markdown spec
+var word2mdJs = path.join(scriptsDirectory, "word2md.js");
+var word2mdTs = path.join(scriptsDirectory, "word2md.ts");
+var specWord = path.join(docDirectory, "TypeScript Language Specification.docx");
+var specMd = path.join(docDirectory, "spec.md");
+
+file(word2mdTs);
+
+// word2md script
+compileFile(word2mdJs,
+    [word2mdTs],
+    [word2mdTs],
+    [],
+    /*useBuiltCompiler*/ false,
+    {
+        lib: "scripthost,es5"
     });
+
+// The generated spec.md; built for the 'generate-spec' task
+file(specMd, [word2mdJs, specWord], function () {
+    var specWordFullPath = path.resolve(specWord);
+    var specMDFullPath = path.resolve(specMd);
+    var cmd = "cscript //nologo " + word2mdJs + ' "' + specWordFullPath + '" ' + '"' + specMDFullPath + '"';
+    console.log(cmd);
+    child_process.exec(cmd, function () {
+        complete();
+    });
+}, { async: true });
+
+
+desc("Generates a Markdown version of the Language Specification");
+task("generate-spec", [specMd]);
+
+
+// Makes a new LKG. This target does not build anything, but errors if not all the outputs are present in the built/local directory
+desc("Makes a new LKG out of the built js files");
+task("LKG", ["clean", "release", "local"].concat(libraryTargets), () => {
+    const sizeBefore = getDirSize(LKGDirectory);
+    var expectedFiles = [tscFile, servicesFile, serverFile, nodePackageFile, nodeDefinitionsFile, standaloneDefinitionsFile, tsserverLibraryFile, tsserverLibraryDefinitionFile, cancellationTokenFile, typingsInstallerFile, buildProtocolDts, watchGuardFile].
+        concat(libraryTargets).
+        concat(localizationTargets);
+    var missingFiles = expectedFiles.filter(f => !fs.existsSync(f));
+    if (missingFiles.length > 0) {
+        fail(new Error("Cannot replace the LKG unless all built targets are present in directory " + builtLocalDirectory +
+            ". The following files are missing:\n" + missingFiles.join("\n")));
+    }
+    // Copy all the targets into the LKG directory
+    jake.mkdirP(LKGDirectory);
+    expectedFiles.forEach(f => jake.cpR(f, LKGDirectory));
+
+    const sizeAfter = getDirSize(LKGDirectory);
+    if (sizeAfter > (sizeBefore * 1.10)) {
+        throw new Error("The lib folder increased by 10% or more. This likely indicates a bug.");
+    }
+});
+
+// Test directory
+directory(builtLocalDirectory);
+
+// Task to build the tests infrastructure using the built compiler
+var run = path.join(builtLocalDirectory, "run.js");
+compileFile(
+    /*outFile*/ run,
+    /*source*/ harnessSources,
+    /*prereqs*/[builtLocalDirectory, tscFile, tsserverLibraryFile].concat(libraryTargets).concat(servicesSources).concat(harnessSources),
+    /*prefixes*/[],
+    /*useBuiltCompiler:*/ true,
+    /*opts*/ { types: ["node", "mocha", "chai"], lib: "es6" });
+
+var internalTests = "internal/";
+
+var localBaseline = "tests/baselines/local/";
+var refBaseline = "tests/baselines/reference/";
+
+var localRwcBaseline = path.join(internalTests, "baselines/rwc/local");
+var refRwcBaseline = path.join(internalTests, "baselines/rwc/reference");
+
+var localTest262Baseline = path.join(internalTests, "baselines/test262/local");
+var refTest262Baseline = path.join(internalTests, "baselines/test262/reference");
+
+desc("Builds the test infrastructure using the built compiler");
+task("tests", ["local", run].concat(libraryTargets));
+
+function exec(cmd, completeHandler, errorHandler) {
+    var ex = jake.createExec([cmd], /** @type {jake.ExecOptions} */({ windowsVerbatimArguments: true, interactive: true }));
+    // Add listeners for output and error
+    ex.addListener("stdout", function (output) {
+        process.stdout.write(output);
+    });
+    ex.addListener("stderr", function (error) {
+        process.stderr.write(error);
+    });
+    ex.addListener("cmdEnd", function () {
+        if (completeHandler) {
+            completeHandler();
+        }
+        complete();
+    });
+    ex.addListener("error", function (e, status) {
+        if (errorHandler) {
+            errorHandler(e, status);
+        }
+        else {
+            fail("Process exited with code " + status);
+        }
+    });
+
+    ex.run();
+}
+
+const del = require("del");
+function cleanTestDirs() {
+    // Clean the local baselines directory
+    if (fs.existsSync(localBaseline)) {
+        del.sync(localBaseline);
+    }
+
+    // Clean the local Rwc baselines directory
+    if (fs.existsSync(localRwcBaseline)) {
+        del.sync(localRwcBaseline);
+    }
+
+    jake.mkdirP(localRwcBaseline);
+    jake.mkdirP(localTest262Baseline);
+    jake.mkdirP(localBaseline);
+}
+
+// used to pass data from jake command line directly to run.js
+function writeTestConfigFile(tests, runners, light, taskConfigsFolder, workerCount, stackTraceLimit, colors, testTimeout) {
+    var testConfigContents = JSON.stringify({
+        runners: runners ? runners.split(",") : undefined,
+        test: tests ? [tests] : undefined,
+        light: light,
+        workerCount: workerCount,
+        taskConfigsFolder: taskConfigsFolder,
+        stackTraceLimit: stackTraceLimit,
+        noColor: !colors,
+        timeout: testTimeout
+    });
+    fs.writeFileSync('test.config', testConfigContents);
+}
+
+function deleteTemporaryProjectOutput() {
+    if (fs.existsSync(path.join(localBaseline, "projectOutput/"))) {
+        jake.rmRf(path.join(localBaseline, "projectOutput/"));
+    }
 }
 
 function runConsoleTests(defaultReporter, runInParallel) {
@@ -346,7 +803,7 @@ function runConsoleTests(defaultReporter, runInParallel) {
     // timeout normally isn't necessary but Travis-CI has been timing out on compiler baselines occasionally
     // default timeout is 2sec which really should be enough, but maybe we just need a small amount longer
     if (!runInParallel) {
-        var startTime = Travis.mark();
+        var startTime = mark();
         var args = [];
         args.push("-R", reporter);
         if (tests) {
@@ -370,7 +827,7 @@ function runConsoleTests(defaultReporter, runInParallel) {
         else {
             args.push("-t", testTimeout);
         }
-        args.push(Paths.builtLocalRun);
+        args.push(run);
 
         var cmd = "mocha " + args.join(" ");
         console.log(cmd);
@@ -379,12 +836,12 @@ function runConsoleTests(defaultReporter, runInParallel) {
         process.env.NODE_ENV = "development";
         exec(cmd, function () {
             process.env.NODE_ENV = savedNodeEnv;
-            Travis.measure(startTime);
+            measure(startTime);
             runLinter();
             finish();
         }, function (e, status) {
             process.env.NODE_ENV = savedNodeEnv;
-            Travis.measure(startTime);
+            measure(startTime);
             finish(status);
         });
 
@@ -392,15 +849,15 @@ function runConsoleTests(defaultReporter, runInParallel) {
     else {
         var savedNodeEnv = process.env.NODE_ENV;
         process.env.NODE_ENV = "development";
-        var startTime = Travis.mark();
+        var startTime = mark();
         exec(host + " " + run, function () {
             process.env.NODE_ENV = savedNodeEnv;
-            Travis.measure(startTime);
+            measure(startTime);
             runLinter();
             finish();
         }, function (e, status) {
             process.env.NODE_ENV = savedNodeEnv;
-            Travis.measure(startTime);
+            measure(startTime);
             finish(status);
         });
     }
@@ -428,178 +885,59 @@ function runConsoleTests(defaultReporter, runInParallel) {
         });
         lint.invoke();
     }
+}
 
-    // used to pass data from jake command line directly to run.js
-    function writeTestConfigFile(tests, runners, light, taskConfigsFolder, workerCount, stackTraceLimit, colors, testTimeout) {
-        var testConfigContents = JSON.stringify({
-            runners: runners ? runners.split(",") : undefined,
-            test: tests ? [tests] : undefined,
-            light: light,
-            workerCount: workerCount,
-            taskConfigsFolder: taskConfigsFolder,
-            stackTraceLimit: stackTraceLimit,
-            noColor: !colors,
-            timeout: testTimeout
-        });
-        fs.writeFileSync('test.config', testConfigContents);
+desc("Runs all the tests in parallel using the built run.js file. Optional arguments are: t[ests]=category1|category2|... d[ebug]=true.");
+task("runtests-parallel", ["build-rules", "tests", builtLocalDirectory], function () {
+    runConsoleTests('min', /*runInParallel*/ true);
+}, { async: true });
+
+desc("Runs the tests using the built run.js file. Optional arguments are: t[ests]=regex r[eporter]=[list|spec|json|<more>] d[ebug]=true color[s]=false lint=true bail=false dirty=false.");
+task("runtests", ["build-rules", "tests", builtLocalDirectory], function() {
+    runConsoleTests('mocha-fivemat-progress-reporter', /*runInParallel*/ false);
+}, { async: true });
+
+desc("Generates code coverage data via instanbul");
+task("generate-code-coverage", ["tests", builtLocalDirectory], function () {
+    var testTimeout = process.env.timeout || defaultTestTimeout;
+    var cmd = 'istanbul cover node_modules/mocha/bin/_mocha -- -R min -t ' + testTimeout + ' ' + run;
+    console.log(cmd);
+    exec(cmd);
+}, { async: true });
+
+// Browser tests
+var nodeServerOutFile = "tests/webTestServer.js";
+var nodeServerInFile = "tests/webTestServer.ts";
+compileFile(nodeServerOutFile, [nodeServerInFile], [builtLocalDirectory, tscFile], [], /*useBuiltCompiler:*/ true, { noOutFile: true, lib: "es6" });
+
+desc("Runs browserify on run.js to produce a file suitable for running tests in the browser");
+task("browserify", [], function() {
+    // Shell out to `gulp`, since we do the work to handle sourcemaps correctly w/o inline maps there
+    var cmd = 'gulp browserify --silent';
+    exec(cmd);
+}, { async: true });
+
+desc("Runs the tests using the built run.js file like 'jake runtests'. Syntax is jake runtests-browser. Additional optional parameters tests=[regex], browser=[chrome|IE]");
+task("runtests-browser", ["browserify", nodeServerOutFile], function () {
+    cleanTestDirs();
+    host = "node";
+    var browser = process.env.browser || process.env.b ||  (os.platform() === "win32" ? "edge" : "chrome");
+    var runners = process.env.runners || process.env.runner || process.env.ru;
+    var tests = process.env.test || process.env.tests || process.env.t;
+    var light = process.env.light || false;
+    var testConfigFile = 'test.config';
+    if (fs.existsSync(testConfigFile)) {
+        fs.unlinkSync(testConfigFile);
+    }
+    if (tests || runners || light) {
+        writeTestConfigFile(tests, runners, light);
     }
 
-    function deleteTemporaryProjectOutput() {
-        if (fs.existsSync(path.join(Paths.baselines.local, "projectOutput/"))) {
-            jake.rmRf(path.join(Paths.baselines.local, "projectOutput/"));
-        }
-    }
-}
-
-function cleanTestDirs() {
-    // Clean the local baselines directory
-    if (fs.existsSync(Paths.baselines.local)) {
-        del.sync(Paths.baselines.local);
-    }
-
-    // Clean the local Rwc baselines directory
-    if (fs.existsSync(Paths.baselines.localRwc)) {
-        del.sync(Paths.baselines.localRwc);
-    }
-
-    jake.mkdirP(Paths.baselines.local);
-    jake.mkdirP(Paths.baselines.localRwc);
-    jake.mkdirP(Paths.baselines.localTest262);
-}
-
-function tsbuild(tsconfigPath, useLkg = true, done = undefined) {
-    const startCompileTime = Travis.mark();
-
-    const compilerPath = useLkg ? Paths.lkgCompiler : Paths.builtLocalCompiler;
-    const cmd = `${host} ${compilerPath} -b -v ${Array.isArray(tsconfigPath) ? tsconfigPath.join(" ") : tsconfigPath}`;
-
-    var ex = jake.createExec([cmd]);
-    // Add listeners for output and error
-    ex.addListener("stdout", function (output) {
-        process.stdout.write(output);
-    });
-    ex.addListener("stderr", function (error) {
-        process.stderr.write(error);
-    });
-    ex.addListener("cmdEnd", function () {
-        /*
-        if (!useDebugMode && prefixes && fs.existsSync(outFile)) {
-            for (var i in prefixes) {
-                prependFile(prefixes[i], outFile);
-            }
-        }
-
-        if (callback) {
-            callback();
-        }
-        */
-
-        Travis.measure(startCompileTime);
-        done && done();
-    });
-    ex.addListener("error", function () {
-        fail(`Compilation of ${tsconfigPath} unsuccessful`);
-        Travis.measure(startCompileTime);
-    });
-    ex.run();
-}
-
-const Travis = {
-    mark() {
-        if (!fold.isTravis()) return;
-        var stamp = process.hrtime();
-        var id = Math.floor(Math.random() * 0xFFFFFFFF).toString(16);
-        console.log("travis_time:start:" + id + "\r");
-        return {
-            stamp: stamp,
-            id: id
-        };
-    },
-    measure(marker) {
-        if (!fold.isTravis()) return;
-        var diff = process.hrtime(marker.stamp);
-        var total = [marker.stamp[0] + diff[0], marker.stamp[1] + diff[1]];
-        console.log("travis_time:end:" + marker.id + ":start=" + toNs(marker.stamp) + ",finish=" + toNs(total) + ",duration=" + toNs(diff) + "\r");
-    }
-};
-
-function toNs(diff) {
-    return diff[0] * 1e9 + diff[1];
-}
-
-function exec(cmd, completeHandler, errorHandler) {
-    var ex = jake.createExec([cmd], /** @type {jake.ExecOptions} */({ windowsVerbatimArguments: true, interactive: true }));
-    // Add listeners for output and error
-    ex.addListener("stdout", function (output) {
-        process.stdout.write(output);
-    });
-    ex.addListener("stderr", function (error) {
-        process.stderr.write(error);
-    });
-    ex.addListener("cmdEnd", function () {
-        if (completeHandler) {
-            completeHandler();
-        }
-        complete();
-    });
-    ex.addListener("error", function (e, status) {
-        if (errorHandler) {
-            errorHandler(e, status);
-        }
-        else {
-            fail("Process exited with code " + status);
-        }
-    });
-
-    ex.run();
-}
-
-/** @param jsonPath {string} */
-function readJson(jsonPath) {
-    const jsonText = fs.readFileSync(jsonPath, "utf8");
-    const result = ts.parseConfigFileTextToJson(jsonPath, jsonText);
-    if (result.error) {
-        reportDiagnostics([result.error]);
-        throw new Error("An error occurred during parse.");
-    }
-    return result.config;
-}
-
-/** @param diagnostics {ts.Diagnostic[]} */
-function reportDiagnostics(diagnostics) {
-    console.log(diagnosticsToString(diagnostics, process.stdout.isTTY));
-}
-
-/**
- * @param diagnostics {ts.Diagnostic[]}
- * @param [pretty] {boolean}
- */
-function diagnosticsToString(diagnostics, pretty) {
-    const host = {
-        getCurrentDirectory() { return process.cwd(); },
-        getCanonicalFileName(fileName) { return fileName; },
-        getNewLine() { return os.EOL; }
-    };
-    return pretty ? ts.formatDiagnosticsWithColorAndContext(diagnostics, host) :
-        ts.formatDiagnostics(diagnostics, host);
-}
-
-// concatenate a list of sourceFiles to a destinationFile
-function concatenateFiles(destinationFile, sourceFiles) {
-    var temp = "temptemp";
-    // append all files in sequence
-    var text = "";
-    for (var i = 0; i < sourceFiles.length; i++) {
-        if (!fs.existsSync(sourceFiles[i])) {
-            fail(sourceFiles[i] + " does not exist!");
-        }
-        if (i > 0) { text += "\n\n"; }
-        text += fs.readFileSync(sourceFiles[i]).toString().replace(/\r?\n/g, "\n");
-    }
-    fs.writeFileSync(temp, text);
-    // Move the file to the final destination
-    fs.renameSync(temp, destinationFile);
-}
+    tests = tests ? tests : '';
+    var cmd = host + " tests/webTestServer.js " + browser + " " + JSON.stringify(tests);
+    console.log(cmd);
+    exec(cmd);
+}, { async: true });
 
 function getDiffTool() {
     var program = process.env['DIFF'];
@@ -609,6 +947,183 @@ function getDiffTool() {
     return program;
 }
 
-function removeConstModifierFromEnumDeclarations(text) {
-    return text.replace(/^(\s*)(export )?const enum (\S+) {(\s*)$/gm, '$1$2enum $3 {$4');
+// Baseline Diff
+desc("Diffs the compiler baselines using the diff tool specified by the 'DIFF' environment variable");
+task('diff', function () {
+    var cmd = '"' + getDiffTool() + '" ' + refBaseline + ' ' + localBaseline;
+    console.log(cmd);
+    exec(cmd);
+}, { async: true });
+
+desc("Diffs the RWC baselines using the diff tool specified by the 'DIFF' environment variable");
+task('diff-rwc', function () {
+    var cmd = '"' + getDiffTool() + '" ' + refRwcBaseline + ' ' + localRwcBaseline;
+    console.log(cmd);
+    exec(cmd);
+}, { async: true });
+
+desc("Builds the test sources and automation in debug mode");
+task("tests-debug", ["setDebugMode", "tests"]);
+
+
+// Makes the test results the new baseline
+desc("Makes the most recent test results the new baseline, overwriting the old baseline");
+task("baseline-accept", function () {
+    acceptBaseline(localBaseline, refBaseline);
+});
+
+function acceptBaseline(sourceFolder, targetFolder) {
+    console.log('Accept baselines from ' + sourceFolder + ' to ' + targetFolder);
+    var deleteEnding = '.delete';
+
+    acceptBaselineFolder(sourceFolder, targetFolder);
+
+    function acceptBaselineFolder(sourceFolder, targetFolder) {
+        var files = fs.readdirSync(sourceFolder);
+
+        for (var i in files) {
+            var filename = files[i];
+            var fullLocalPath = path.join(sourceFolder, filename);
+            var stat = fs.statSync(fullLocalPath);
+            if (stat.isFile()) {
+                if (filename.substr(filename.length - deleteEnding.length) === deleteEnding) {
+                    filename = filename.substr(0, filename.length - deleteEnding.length);
+                    fs.unlinkSync(path.join(targetFolder, filename));
+                }
+                else {
+                    var target = path.join(targetFolder, filename);
+                    if (fs.existsSync(target)) {
+                        fs.unlinkSync(target);
+                    }
+                    jake.mkdirP(path.dirname(target));
+                    fs.renameSync(path.join(sourceFolder, filename), target);
+                }
+            }
+            else if (stat.isDirectory()) {
+                acceptBaselineFolder(fullLocalPath, path.join(targetFolder, filename));
+            }
+        }
+    }
 }
+
+desc("Makes the most recent rwc test results the new baseline, overwriting the old baseline");
+task("baseline-accept-rwc", function () {
+    acceptBaseline(localRwcBaseline, refRwcBaseline);
+});
+
+desc("Makes the most recent test262 test results the new baseline, overwriting the old baseline");
+task("baseline-accept-test262", function () {
+    acceptBaseline(localTest262Baseline, refTest262Baseline);
+});
+
+
+// Webhost
+var webhostPath = "tests/webhost/webtsc.ts";
+var webhostJsPath = "tests/webhost/webtsc.js";
+compileFile(webhostJsPath, [webhostPath], [tscFile, webhostPath].concat(libraryTargets), [], /*useBuiltCompiler*/true);
+
+desc("Builds the tsc web host");
+task("webhost", [webhostJsPath], function () {
+    jake.cpR(path.join(builtLocalDirectory, "lib.d.ts"), "tests/webhost/", { silent: true });
+});
+
+// Perf compiler
+var perftscPath = "tests/perftsc.ts";
+var perftscJsPath = "built/local/perftsc.js";
+compileFile(perftscJsPath, [perftscPath], [tscFile, perftscPath, "tests/perfsys.ts"].concat(libraryTargets), [], /*useBuiltCompiler*/ true);
+desc("Builds augmented version of the compiler for perf tests");
+task("perftsc", [perftscJsPath]);
+
+// Instrumented compiler
+var loggedIOpath = harnessDirectory + 'loggedIO.ts';
+var loggedIOJsPath = builtLocalDirectory + 'loggedIO.js';
+file(loggedIOJsPath, [builtLocalDirectory, loggedIOpath], function () {
+    var temp = builtLocalDirectory + 'temp';
+    jake.mkdirP(temp);
+    var options = "--target es5 --lib es6 --types --outdir " + temp + ' ' + loggedIOpath;
+    var cmd = host + " " + LKGDirectory + compilerFilename + " " + options + " ";
+    console.log(cmd + "\n");
+    var ex = jake.createExec([cmd]);
+    ex.addListener("cmdEnd", function () {
+        fs.renameSync(temp + '/harness/loggedIO.js', loggedIOJsPath);
+        jake.rmRf(temp);
+        complete();
+    });
+    ex.run();
+}, { async: true });
+
+var instrumenterPath = harnessDirectory + 'instrumenter.ts';
+var instrumenterJsPath = builtLocalDirectory + 'instrumenter.js';
+compileFile(instrumenterJsPath, [instrumenterPath], [tscFile, instrumenterPath].concat(libraryTargets), [], /*useBuiltCompiler*/ true, { lib: "es6", types: ["node"], noOutFile: true, outDir: builtLocalDirectory });
+
+desc("Builds an instrumented tsc.js - run with test=[testname]");
+task('tsc-instrumented', [loggedIOJsPath, instrumenterJsPath, tscFile], function () {
+    var test = process.env.test || process.env.tests || process.env.t || "iocapture";
+    var cmd = host + ' ' + instrumenterJsPath + " record " + test + " " + builtLocalDirectory + compilerFilename;
+    console.log(cmd);
+    var ex = jake.createExec([cmd]);
+    ex.addListener("cmdEnd", function () {
+        complete();
+    });
+    ex.run();
+}, { async: true });
+
+desc("Updates the sublime plugin's tsserver");
+task("update-sublime", ["local", serverFile], function () {
+    jake.cpR(serverFile, "../TypeScript-Sublime-Plugin/tsserver/");
+    jake.cpR(serverFile + ".map", "../TypeScript-Sublime-Plugin/tsserver/");
+});
+
+var tslintRuleDir = "scripts/tslint/rules";
+var tslintRules = fs.readdirSync(tslintRuleDir);
+var tslintRulesFiles = tslintRules.map(function (p) {
+    return path.join(tslintRuleDir, p);
+});
+var tslintRulesOutFiles = tslintRules.map(function (p) {
+    return path.join(builtLocalDirectory, "tslint/rules", p.replace(".ts", ".js"));
+});
+var tslintFormattersDir = "scripts/tslint/formatters";
+var tslintFormatters = [
+    "autolinkableStylishFormatter",
+];
+var tslintFormatterFiles = tslintFormatters.map(function (p) {
+    return path.join(tslintFormattersDir, p + ".ts");
+});
+var tslintFormattersOutFiles = tslintFormatters.map(function (p) {
+    return path.join(builtLocalDirectory, "tslint/formatters", p + ".js");
+});
+desc("Compiles tslint rules to js");
+task("build-rules", ["build-rules-start"].concat(tslintRulesOutFiles).concat(tslintFormattersOutFiles).concat(["build-rules-end"]));
+tslintRulesFiles.forEach(function (ruleFile, i) {
+    compileFile(tslintRulesOutFiles[i], [ruleFile], [ruleFile], [], /*useBuiltCompiler*/ false,
+        { noOutFile: true, generateDeclarations: false, outDir: path.join(builtLocalDirectory, "tslint/rules"), lib: "es6" });
+});
+tslintFormatterFiles.forEach(function (ruleFile, i) {
+    compileFile(tslintFormattersOutFiles[i], [ruleFile], [ruleFile], [], /*useBuiltCompiler*/ false,
+        { noOutFile: true, generateDeclarations: false, outDir: path.join(builtLocalDirectory, "tslint/formatters"), lib: "es6" });
+});
+
+desc("Emit the start of the build-rules fold");
+task("build-rules-start", [], function () {
+    if (fold.isTravis()) console.log(fold.start("build-rules"));
+});
+
+desc("Emit the end of the build-rules fold");
+task("build-rules-end", [], function () {
+    if (fold.isTravis()) console.log(fold.end("build-rules"));
+});
+
+desc("Runs tslint on the compiler sources. Optional arguments are: f[iles]=regex");
+task("lint", ["build-rules"], () => {
+    if (fold.isTravis()) console.log(fold.start("lint"));
+    function lint(project, cb) {
+        const fix = process.env.fix || process.env.f;
+        const cmd = `node node_modules/tslint/bin/tslint --project ${project} --formatters-dir ./built/local/tslint/formatters --format autolinkableStylish${fix ? " --fix" : ""}`;
+        console.log("Linting: " + cmd);
+        jake.exec([cmd], cb, /** @type {jake.ExecOptions} */({ interactive: true, windowsVerbatimArguments: true }));
+    }
+    lint("scripts/tslint/tsconfig.json", () => lint("src/tsconfig-base.json", () => {
+        if (fold.isTravis()) console.log(fold.end("lint"));
+        complete();
+    }));
+});

From 5804905ca69a3673a8f229519b81d1df494f80bc Mon Sep 17 00:00:00 2001
From: Ryan Cavanaugh <the.ryan.cavanaugh@gmail.com>
Date: Sun, 10 Jun 2018 13:23:16 -0700
Subject: [PATCH 20/37] Jakefile rewrite WIP

---
 Jakefile.js                     | 1331 ++++++++++---------------------
 src/compiler/program.ts         |    2 +-
 src/compiler/resolutionCache.ts |   12 +-
 src/core/core.ts                |    2 +-
 src/harness/fourslash.ts        |    3 +-
 src/harness/harness.ts          |    2 +-
 src/parser/utilities.ts         |    9 +-
 src/server/tsconfig.json        |    2 +-
 8 files changed, 418 insertions(+), 945 deletions(-)

diff --git a/Jakefile.js b/Jakefile.js
index a6483355c73..3015134ea6c 100644
--- a/Jakefile.js
+++ b/Jakefile.js
@@ -2,262 +2,254 @@
 // @ts-check
 /// <reference types="jake" />
 
-var fs = require("fs");
-var os = require("os");
-var path = require("path");
-var child_process = require("child_process");
-var fold = require("travis-fold");
-var ts = require("./lib/typescript");
+const fs = require("fs");
+const os = require("os");
+const path = require("path");
+const child_process = require("child_process");
+const removeInternal = require("remove-internal");
+const fold = require("travis-fold");
+const ts = require("./lib/typescript");
+const del = require("del");
 const getDirSize = require("./scripts/build/getDirSize");
 
-// Variables
-var compilerDirectory = "src/compiler/";
-var serverDirectory = "src/server/";
-var harnessDirectory = "src/harness/";
-var libraryDirectory = "src/lib/";
-var scriptsDirectory = "scripts/";
-var unittestsDirectory = "src/harness/unittests/";
-var docDirectory = "doc/";
-var lclDirectory = "src/loc/lcl";
+const host = process.env.TYPESCRIPT_HOST || process.env.host || "node";
 
-var builtDirectory = "built/";
-var builtLocalDirectory = "built/local/";
-var LKGDirectory = "lib/";
+const locales = ["cs", "de", "es", "fr", "it", "ja", "ko", "pl", "pt-br", "ru", "tr", "zh-cn", "zh-tw"];
 
-var copyright = "CopyrightNotice.txt";
-var thirdParty = "ThirdPartyNoticeText.txt";
+const defaultTestTimeout = 40000;
 
-var defaultTestTimeout = 40000;
+let useDebugMode = true;
 
-// add node_modules to path so we don't need global modules, prefer the modules by adding them first
-var nodeModulesPathPrefix = path.resolve("./node_modules/.bin/") + path.delimiter;
-if (process.env.path !== undefined) {
-    process.env.path = nodeModulesPathPrefix + process.env.path;
-}
-else if (process.env.PATH !== undefined) {
-    process.env.PATH = nodeModulesPathPrefix + process.env.PATH;
-}
+const TaskNames = {
+    local: "local",
+    runtests: "runtests",
+    runtestsParallel: "runtests-parallel",
+    buildRules: "build-rules",
+    clean: "clean",
+    lib: "lib",
+    buildFoldStart: "build-fold-start",
+    buildFoldEnd: "build-fold-end",
+    generateDiagnostics: "generate-diagnostics",
+    coreBuild: "core-build",
+    lkg: "LKG",
+    release: "release",
+    lssl: "lssl",
+    lint: "lint"
+};
 
-/**
- * @param diagnostics {ts.Diagnostic[]}
- * @param [pretty] {boolean}
- */
-function diagnosticsToString(diagnostics, pretty) {
-    const host = {
-        getCurrentDirectory() { return process.cwd(); },
-        getCanonicalFileName(fileName) { return fileName; },
-        getNewLine() { return os.EOL; }
-    };
-    return pretty ? ts.formatDiagnosticsWithColorAndContext(diagnostics, host) :
-        ts.formatDiagnostics(diagnostics, host);
-}
+const Paths = {
+    lkg: "lib",
+    lkgCompiler: "lib/tsc.js",
 
-/** @param diagnostics {ts.Diagnostic[]} */
-function reportDiagnostics(diagnostics) {
-    console.log(diagnosticsToString(diagnostics, process.stdout.isTTY));
-}
+    built: "built",
+    builtLocal: "built/local",
+    builtLocalCompiler: "built/local/tsc.js",
+    builtLocalRun: "built/local/run.js",
+    locLcg: "built/local/enu/diagnosticMessages.generated.json.lcg",
+    typesMapOutput: "built/local/typesMap.json",
+    servicesFile: "built/local/typescriptServices.js",
+    servicesDefinitionFile: "built/local/typescriptServices.d.ts",
 
-/** @param jsonPath {string} */
-function readJson(jsonPath) {
-    const jsonText = fs.readFileSync(jsonPath, "utf8");
-    const result = ts.parseConfigFileTextToJson(jsonPath, jsonText);
-    if (result.error) {
-        reportDiagnostics([result.error]);
-        throw new Error("An error occurred during parse.");
-    }
-    return result.config;
-}
+    tsserverLibraryFile: "built/local/tsserverlibrary.js",
+    tsserverLibraryDefinitionFile: "built/local/tsserverlibrary.d.ts",
 
-/** @param configPath {string} */
-function filesFromConfig(configPath) {
-    const config = readJson(configPath);
-    const configFileContent = ts.parseJsonConfigFileContent(config, ts.sys, path.dirname(configPath));
-    if (configFileContent.errors && configFileContent.errors.length) {
-        reportDiagnostics(configFileContent.errors);
-        throw new Error("An error occurred during parse.");
-    }
-    return configFileContent.fileNames;
-}
+    baselines: {
+        local: "tests/baselines/local",
+        localTest262: "tests/baselines/test262/local",
+        localRwc: "tests/baselines/rwc/local",
+        reference: "tests/baselines/reference",
+        referenceTest262: "tests/baselines/test262/reference",
+        referenceRwc: "tests/baselines/rwc/reference"
+    },
+    copyright: "CopyrightNotice.txt",
+    thirdParty: "ThirdPartyNoticeText.txt",
+    library: "src/lib",
 
-function toNs(diff) {
-    return diff[0] * 1e9 + diff[1];
-}
+    processDiagnosticMessagesJs: "scripts/processDiagnosticMessages.js",
+    diagnosticInformationMap: "src/parser/diagnosticInformationMap.generated.ts",
+    diagnosticMessagesJson: "src/parser/diagnosticMessages.json",
 
-function mark() {
-    if (!fold.isTravis()) return;
-    var stamp = process.hrtime();
-    var id = Math.floor(Math.random() * 0xFFFFFFFF).toString(16);
-    console.log("travis_time:start:" + id + "\r");
-    return {
-        stamp: stamp,
-        id: id
-    };
-}
+    srcServer: "src/server",
 
-function measure(marker) {
-    if (!fold.isTravis()) return;
-    var diff = process.hrtime(marker.stamp);
-    var total = [marker.stamp[0] + diff[0], marker.stamp[1] + diff[1]];
-    console.log("travis_time:end:" + marker.id + ":start=" + toNs(marker.stamp) + ",finish=" + toNs(total) + ",duration=" + toNs(diff) + "\r");
-}
+};
 
-function removeConstModifierFromEnumDeclarations(text) {
-     return text.replace(/^(\s*)(export )?const enum (\S+) {(\s*)$/gm, '$1$2enum $3 {$4');
-}
+const ConfigFileFor = {
+    tsc: "src/tsc",
+    tsserver: "src/tsserver",
+    runjs: "src/testRunner",
+    lint: "scripts/tslint",
+    all: "src"
+};
 
-var compilerSources = filesFromConfig("./src/compiler/tsconfig.json");
-var servicesSources = filesFromConfig("./src/services/tsconfig.json");
-var cancellationTokenSources = filesFromConfig(path.join(serverDirectory, "cancellationToken/tsconfig.json"));
-var typingsInstallerSources = filesFromConfig(path.join(serverDirectory, "typingsInstaller/tsconfig.json"));
-var watchGuardSources = filesFromConfig(path.join(serverDirectory, "watchGuard/tsconfig.json"));
-var serverSources = filesFromConfig(path.join(serverDirectory, "tsconfig.json"));
-var languageServiceLibrarySources = filesFromConfig(path.join(serverDirectory, "tsconfig.library.json"));
-var harnessSources = filesFromConfig("./src/harness/tsconfig.json");
-
-var typesMapOutputPath = path.join(builtLocalDirectory, 'typesMap.json');
+const ExpectedLKGFiles = [
+    "tsc.js",
+    "tsserver.js",
+    "typescriptServices.js",
+    "typescriptServices.d.ts",
+    "typescript.js",
+    "typescript.d.ts",
+    "tsserverlibrary.js",
+    "tsserverlibrary.d.js",
+    "cancellationToken.js",
+    "typingsInstaller.js",
+    "protocol.d.ts",
+    "watchGuard.js"
+];
 
 /** @type {{ libs: string[], paths?: Record<string, string>, sources?: Record<string, string[]> }} */
-var libraries = readJson("./src/lib/libs.json");
+const libraries = readJson("./src/lib/libs.json");
 
-/**
- * .lcg file is what localization team uses to know what messages to localize.
- * The file is always generated in 'enu\diagnosticMessages.generated.json.lcg'
- */
-var generatedLCGFile = path.join(builtLocalDirectory, "enu", "diagnosticMessages.generated.json.lcg");
+directory(Paths.builtLocal);
 
-/**
- * The localization target produces the two following transformations:
- *    1. 'src\loc\lcl\<locale>\diagnosticMessages.generated.json.lcl' => 'built\local\<locale>\diagnosticMessages.generated.json'
- *       convert localized resources into a .json file the compiler can understand
- *    2. 'src\compiler\diagnosticMessages.generated.json' => 'built\local\ENU\diagnosticMessages.generated.json.lcg'
- *       generate the lcg file (source of messages to localize) from the diagnosticMessages.generated.json
- */
-var localizationTargets = ["cs", "de", "es", "fr", "it", "ja", "ko", "pl", "pt-br", "ru", "tr", "zh-cn", "zh-tw"].map(function (f) {
-    return path.join(builtLocalDirectory, f);
-}).concat(path.dirname(generatedLCGFile));
+// Local target to build the compiler and services
+desc("Builds the full compiler and services");
+task(TaskNames.local, [
+    TaskNames.buildFoldStart,
+    TaskNames.generateDiagnostics,
+    TaskNames.lib,
+    TaskNames.coreBuild,
+    // buildProtocolDts,
+    // builtGeneratedDiagnosticMessagesJSON,
+    TaskNames.lssl,
+    // "localize",
+    TaskNames.buildFoldEnd
+]);
 
-// Prepends the contents of prefixFile to destinationFile
-function prependFile(prefixFile, destinationFile) {
-    if (!fs.existsSync(prefixFile)) {
-        fail(prefixFile + " does not exist!");
+desc("Runs all the tests in parallel using the built run.js file. Optional arguments are: t[ests]=category1|category2|... d[ebug]=true.");
+task(TaskNames.runtestsParallel, [TaskNames.lib], function () {
+    tsbuild([ConfigFileFor.runjs, ConfigFileFor.lint]);
+    runConsoleTests("min", /*parallel*/ true);
+}, { async: true });
+
+desc("Runs all the tests in parallel using the built run.js file. Optional arguments are: t[ests]=category1|category2|... d[ebug]=true.");
+task(TaskNames.runtests, [TaskNames.lib], function () {
+    tsbuild([ConfigFileFor.runjs, ConfigFileFor.lint]);
+    runConsoleTests('mocha-fivemat-progress-reporter', /*runInParallel*/ false);;
+}, { async: true });
+
+const libraryTargets = getLibraryTargets();
+desc("Builds the library targets");
+task(TaskNames.lib, libraryTargets);
+
+desc("Builds language service server library");
+task("lssl", [TaskNames.coreBuild, Paths.tsserverLibraryFile, Paths.tsserverLibraryDefinitionFile, Paths.typesMapOutput]);
+
+// Makes a new LKG. This target does not build anything, but errors if not all the outputs are present in the built/local directory
+desc("Makes a new LKG out of the built js files");
+task(TaskNames.lkg, [
+    TaskNames.clean,
+    TaskNames.release,
+    TaskNames.local,
+    ...libraryTargets
+], () => {
+    const sizeBefore = getDirSize(Paths.lkg);
+    const localizationTargets = locales.map(f => path.join(Paths.builtLocal, f)).concat(path.dirname(Paths.locLcg));
+
+    const copyrightContent = fs.readFileSync(Paths.copyright, { encoding: 'utf-8' });
+
+    const expectedFiles = [...libraryTargets, ...ExpectedLKGFiles, ...localizationTargets];
+    const missingFiles = expectedFiles.filter(f => !fs.existsSync(f));
+    if (missingFiles.length > 0) {
+        fail(new Error("Cannot replace the LKG unless all built targets are present in directory " + Paths.builtLocal +
+            ". The following files are missing:\n" + missingFiles.join("\n")));
     }
-    if (!fs.existsSync(destinationFile)) {
-        fail(destinationFile + " failed to be created!");
+    // Copy all the targets into the LKG directory
+    jake.mkdirP(Paths.lkg);
+    expectedFiles.forEach(f => {
+        let content = fs.readFileSync(f, { encoding: 'utf-8' });
+
+        // If this is a .d.ts file, run remove-internal on it
+        if (f.endsWith(".d.ts")) {
+            content = removeInternal.elide(content).result;
+        }
+
+        if (f.endsWith(".d.ts") || f.endsWith(".js")) {
+            // Prepend the copyright header to it
+            content = copyrightContent + content;
+        }
+
+        fs.writeFile(path.join(Paths.lkg, path.basename(f)), content, { encoding: 'utf-8' }, (err) => {
+            if (err) throw err;
+        });
+    });
+
+    const sizeAfter = getDirSize(Paths.lkg);
+    if (sizeAfter > (sizeBefore * 1.10)) {
+        throw new Error("The lib folder increased by 10% or more. This likely indicates a bug.");
     }
-    var temp = "temptemp";
-    jake.cpR(prefixFile, temp, { silent: true });
-    fs.appendFileSync(temp, fs.readFileSync(destinationFile));
-    fs.renameSync(temp, destinationFile);
-}
+});
 
-// concatenate a list of sourceFiles to a destinationFile
-function concatenateFiles(destinationFile, sourceFiles) {
-    var temp = "temptemp";
-    // append all files in sequence
-    var text = "";
-    for (var i = 0; i < sourceFiles.length; i++) {
-        if (!fs.existsSync(sourceFiles[i])) {
-            fail(sourceFiles[i] + " does not exist!");
-        }
-        if (i > 0) { text += "\n\n"; }
-        text += fs.readFileSync(sourceFiles[i]).toString().replace(/\r?\n/g, "\n");
+desc("Runs tslint on the compiler sources. Optional arguments are: f[iles]=regex");
+task(TaskNames.lint, [TaskNames.buildRules], () => {
+    if (fold.isTravis()) console.log(fold.start("lint"));
+    function lint(project, cb) {
+        const fix = process.env.fix || process.env.f;
+        const cmd = `node node_modules/tslint/bin/tslint --project ${project} --formatters-dir ./built/local/tslint/formatters --format autolinkableStylish${fix ? " --fix" : ""}`;
+        console.log("Linting: " + cmd);
+        jake.exec([cmd], cb, /** @type {jake.ExecOptions} */({ interactive: true, windowsVerbatimArguments: true }));
     }
-    fs.writeFileSync(temp, text);
-    // Move the file to the final destination
-    fs.renameSync(temp, destinationFile);
-}
+    lint("scripts/tslint/tsconfig.json", () => lint("src/tsconfig-base.json", () => {
+        if (fold.isTravis()) console.log(fold.end("lint"));
+        complete();
+    }));
+});
 
-var useDebugMode = true;
-var host = process.env.TYPESCRIPT_HOST || process.env.host || "node";
-var compilerFilename = "tsc.js";
-var LKGCompiler = path.join(LKGDirectory, compilerFilename);
-var builtLocalCompiler = path.join(builtLocalDirectory, compilerFilename);
+desc("Diffs the compiler baselines using the diff tool specified by the 'DIFF' environment variable");
+task('diff', function () {
+    var cmd = `"${getDiffTool()} ${Paths.baselines.reference} ${Paths.baselines.local}`;
+    console.log(cmd);
+    exec(cmd);
+}, { async: true });
 
-/**
- * Compiles a file from a list of sources
- * @param {string} outFile the target file name
- * @param {string[]} sources an array of the names of the source files
- * @param {string[]} prereqs prerequisite tasks to compiling the file
- * @param {string[]} prefixes a list of files to prepend to the target file
- * @param {boolean} useBuiltCompiler true to use the built compiler, false to use the LKG
- * @param {object} [opts] property bag containing auxiliary options
- * @param {boolean} [opts.noOutFile] true to compile without using --out
- * @param {boolean} [opts.generateDeclarations] true to compile using --declaration
- * @param {string} [opts.outDir] value for '--outDir' command line option
- * @param {boolean} [opts.keepComments] false to compile using --removeComments
- * @param {boolean} [opts.preserveConstEnums] true if compiler should keep const enums in code
- * @param {boolean} [opts.noResolve] true if compiler should not include non-rooted files in compilation
- * @param {boolean} [opts.stripInternal] true if compiler should remove declarations marked as internal
- * @param {boolean} [opts.inlineSourceMap] true if compiler should inline sourceMap
- * @param {string[]} [opts.types] array of types to include in compilation
- * @param {string} [opts.lib] explicit libs to include.
- * @param {function(): void} [callback] a function to execute after the compilation process ends
- */
-function compileFile(outFile, sources, prereqs, prefixes, useBuiltCompiler, opts, callback) {
-    file(outFile, prereqs, function() {
-        var startCompileTime = mark();
-        opts = opts || {};
-        var compilerPath = useBuiltCompiler ? builtLocalCompiler : LKGCompiler;
-        var options = "--noImplicitAny --noImplicitThis --alwaysStrict --noEmitOnError";
-        if (opts.types) {
-            options += " --types " + opts.types.join(",");
-        }
-        options += " --pretty";
-        // Keep comments when specifically requested
-        // or when in debug mode.
-        if (!(opts.keepComments || useDebugMode)) {
-            options += " --removeComments";
-        }
+desc("Diffs the RWC baselines using the diff tool specified by the 'DIFF' environment variable");
+task('diff-rwc', function () {
+    var cmd = `"${getDiffTool()} ${Paths.baselines.referenceRwc} ${Paths.baselines.localRwc}`;
+    console.log(cmd);
+    exec(cmd);
+}, { async: true });
 
-        if (opts.generateDeclarations) {
-            options += " --declaration";
-        }
+desc("Sets the release mode flag");
+task("release", function () {
+    useDebugMode = false;
+});
 
-        if (opts.preserveConstEnums || useDebugMode) {
-            options += " --preserveConstEnums";
-        }
+desc("Clears the release mode flag");
+task("setDebugMode", function () {
+    useDebugMode = true;
+});
 
-        if (opts.outDir) {
-            options += " --outDir " + opts.outDir;
-        }
+desc("Emit the start of the build fold");
+task(TaskNames.buildFoldStart, [], function () {
+    if (fold.isTravis()) console.log(fold.start("build"));
+});
 
-        if (!opts.noOutFile) {
-            options += " --out " + outFile;
-        }
-        else {
-            options += " --module commonjs";
-        }
+desc("Emit the end of the build fold");
+task(TaskNames.buildFoldEnd, [], function () {
+    if (fold.isTravis()) console.log(fold.end("build"));
+});
 
-        if (opts.noResolve) {
-            options += " --noResolve";
-        }
+desc("Compiles tslint rules to js");
+task(TaskNames.buildRules, [], function () {
+    tsbuild(ConfigFileFor.lint, undefined, () => complete());
+}, { async: true });
 
-        if (useDebugMode) {
-            if (opts.inlineSourceMap) {
-                options += " --inlineSourceMap --inlineSources";
-            }
-            else {
-                options += " --sourcemap";
-            }
-        }
-        options += " --newLine LF";
+desc("Cleans the compiler output, declare files, and tests");
+task(TaskNames.clean, function () {
+    jake.rmRf(Paths.built);
+});
 
-        if (opts.stripInternal) {
-            options += " --stripInternal";
-        }
-        options +=  " --target es5";
-        if (opts.lib) {
-            options += " --lib " + opts.lib;
-        }
-        else {
-            options += " --lib es5";
-        }
-        options += " --noUnusedLocals --noUnusedParameters --strictNullChecks";
+desc("Generates a diagnostic file in TypeScript based on an input JSON file");
+task(TaskNames.generateDiagnostics, [Paths.diagnosticInformationMap]);
 
-        var cmd = host + " " + compilerPath + " " + options + " ";
-        cmd = cmd + sources.join(" ");
-        console.log(cmd + "\n");
+task(TaskNames.coreBuild, function () {
+    tsbuild(ConfigFileFor.all, undefined, () => complete());
+}, { async: true });
 
+file(Paths.diagnosticMessagesJson);
+file(Paths.diagnosticInformationMap, [Paths.diagnosticMessagesJson], function (complete) {
+    tsbuild("scripts/processDiagnosticMessages.tsconfig.json", /*lkg*/ true, function () {
+        const cmd = `${host} scripts/processDiagnosticMessages.js ${Paths.diagnosticMessagesJson}`;
+        console.log(cmd);
         var ex = jake.createExec([cmd]);
         // Add listeners for output and error
         ex.addListener("stdout", function (output) {
@@ -267,492 +259,49 @@ function compileFile(outFile, sources, prereqs, prefixes, useBuiltCompiler, opts
             process.stderr.write(error);
         });
         ex.addListener("cmdEnd", function () {
-            if (!useDebugMode && prefixes && fs.existsSync(outFile)) {
-                for (var i in prefixes) {
-                    prependFile(prefixes[i], outFile);
-                }
-            }
-
-            if (callback) {
-                callback();
-            }
-
-            measure(startCompileTime);
             complete();
         });
-        ex.addListener("error", function () {
-            fs.unlinkSync(outFile);
-            fail("Compilation of " + outFile + " unsuccessful");
-            measure(startCompileTime);
-        });
         ex.run();
-    }, { async: true });
-}
-
-// Prerequisite task for built directory and library typings
-directory(builtLocalDirectory);
-
-var libraryTargets = libraries.libs.map(function (lib) {
-    var relativeSources = ["header.d.ts"].concat(libraries.sources && libraries.sources[lib] || [lib + ".d.ts"]);
-    var relativeTarget = libraries.paths && libraries.paths[lib] || ("lib." + lib + ".d.ts");
-    var sources = [copyright].concat(relativeSources.map(s => path.join(libraryDirectory, s)));
-    var target = path.join(builtLocalDirectory, relativeTarget);
-    file(target, [builtLocalDirectory].concat(sources), function () {
-        concatenateFiles(target, sources);
     });
-    return target;
-});
-
-// Lib target to build the library files
-desc("Builds the library targets");
-task("lib", libraryTargets);
-
-
-// Generate diagnostics
-var processDiagnosticMessagesJs = path.join(scriptsDirectory, "processDiagnosticMessages.js");
-var processDiagnosticMessagesTs = path.join(scriptsDirectory, "processDiagnosticMessages.ts");
-var processDiagnosticMessagesSources = filesFromConfig("./scripts/processDiagnosticMessages.tsconfig.json");
-
-var diagnosticMessagesJson = path.join(compilerDirectory, "diagnosticMessages.json");
-var diagnosticInfoMapTs = path.join(compilerDirectory, "diagnosticInformationMap.generated.ts");
-var generatedDiagnosticMessagesJSON = path.join(compilerDirectory, "diagnosticMessages.generated.json");
-var builtGeneratedDiagnosticMessagesJSON = path.join(builtLocalDirectory, "diagnosticMessages.generated.json");
-
-file(processDiagnosticMessagesTs);
-
-// processDiagnosticMessages script
-compileFile(processDiagnosticMessagesJs,
-    processDiagnosticMessagesSources,
-    processDiagnosticMessagesSources,
-    [],
-    /*useBuiltCompiler*/ false);
-
-// Localize diagnostics script
-var generateLocalizedDiagnosticMessagesJs = path.join(scriptsDirectory, "generateLocalizedDiagnosticMessages.js");
-var generateLocalizedDiagnosticMessagesTs = path.join(scriptsDirectory, "generateLocalizedDiagnosticMessages.ts");
-
-file(generateLocalizedDiagnosticMessagesTs);
-
-compileFile(generateLocalizedDiagnosticMessagesJs,
-    [generateLocalizedDiagnosticMessagesTs],
-    [generateLocalizedDiagnosticMessagesTs],
-    [],
-    /*useBuiltCompiler*/ false, { noOutFile: true, types: ["node", "xml2js"] });
-
-// Localize diagnostics
-file(generatedLCGFile, [generateLocalizedDiagnosticMessagesJs, diagnosticInfoMapTs, generatedDiagnosticMessagesJSON], function () {
-    var cmd = host + " " + generateLocalizedDiagnosticMessagesJs + " " + lclDirectory + " " + builtLocalDirectory + " " + generatedDiagnosticMessagesJSON;
-    console.log(cmd);
-    var ex = jake.createExec([cmd]);
-    // Add listeners for output and error
-    ex.addListener("stdout", function (output) {
-        process.stdout.write(output);
-    });
-    ex.addListener("stderr", function (error) {
-        process.stderr.write(error);
-    });
-    ex.addListener("cmdEnd", function () {
-        complete();
-    });
-    ex.run();
 }, { async: true });
 
-task("localize", [generatedLCGFile]);
-
-var buildProtocolTs = path.join(scriptsDirectory, "buildProtocol.ts");
-var buildProtocolJs = path.join(scriptsDirectory, "buildProtocol.js");
-var buildProtocolDts = path.join(builtLocalDirectory, "protocol.d.ts");
-var typescriptServicesDts = path.join(builtLocalDirectory, "typescriptServices.d.ts");
-
-file(buildProtocolTs);
-
-compileFile(buildProtocolJs,
-    [buildProtocolTs],
-    [buildProtocolTs],
-    [],
-    /*useBuiltCompiler*/ false,
-    { noOutFile: true, lib: "es6" });
-
-file(buildProtocolDts, [buildProtocolTs, buildProtocolJs, typescriptServicesDts], function() {
-
-    var protocolTs = path.join(serverDirectory, "protocol.ts");
-
-    var cmd = host + " " + buildProtocolJs + " "+ protocolTs + " " + typescriptServicesDts + " " + buildProtocolDts;
-    console.log(cmd);
-    var ex = jake.createExec([cmd]);
-    // Add listeners for output and error
-    ex.addListener("stdout", function (output) {
-        process.stdout.write(output);
-    });
-    ex.addListener("stderr", function (error) {
-        process.stderr.write(error);
-    });
-    ex.addListener("cmdEnd", function () {
-        complete();
-    });
-    ex.run();
-}, { async: true });
-
-// The generated diagnostics map; built for the compiler and for the 'generate-diagnostics' task
-file(diagnosticInfoMapTs, [processDiagnosticMessagesJs, diagnosticMessagesJson], function () {
-    var cmd = host + " " + processDiagnosticMessagesJs + " " + diagnosticMessagesJson;
-    console.log(cmd);
-    var ex = jake.createExec([cmd]);
-    // Add listeners for output and error
-    ex.addListener("stdout", function (output) {
-        process.stdout.write(output);
-    });
-    ex.addListener("stderr", function (error) {
-        process.stderr.write(error);
-    });
-    ex.addListener("cmdEnd", function () {
-        complete();
-    });
-    ex.run();
-}, { async: true });
-
-file(builtGeneratedDiagnosticMessagesJSON, [generatedDiagnosticMessagesJSON], function () {
-    if (fs.existsSync(builtLocalDirectory)) {
-        jake.cpR(generatedDiagnosticMessagesJSON, builtGeneratedDiagnosticMessagesJSON);
-    }
-});
-
-desc("Generates a diagnostic file in TypeScript based on an input JSON file");
-task("generate-diagnostics", [diagnosticInfoMapTs]);
-
-// Publish nightly
-var configurePrereleaseJs = path.join(scriptsDirectory, "configurePrerelease.js");
-var configurePrereleaseTs = path.join(scriptsDirectory, "configurePrerelease.ts");
-var packageJson = "package.json";
-var versionFile = path.join(compilerDirectory, "core.ts");
-
-file(configurePrereleaseTs);
-
-compileFile(/*outfile*/configurePrereleaseJs,
-            /*sources*/[configurePrereleaseTs],
-            /*prereqs*/[configurePrereleaseTs],
-            /*prefixes*/[],
-            /*useBuiltCompiler*/ false,
-    { noOutFile: true, generateDeclarations: false, keepComments: false, noResolve: false, stripInternal: false });
-
-task("setDebugMode", function () {
-    useDebugMode = true;
-});
-
-task("configure-nightly", [configurePrereleaseJs], function () {
-    var cmd = host + " " + configurePrereleaseJs + " dev " + packageJson + " " + versionFile;
-    console.log(cmd);
-    exec(cmd);
-}, { async: true });
-
-desc("Configure, build, test, and publish the nightly release.");
-task("publish-nightly", ["configure-nightly", "LKG", "clean", "setDebugMode", "runtests-parallel"], function () {
-    var cmd = "npm publish --tag next";
-    console.log(cmd);
-    exec(cmd);
-});
-
-task("configure-insiders", [configurePrereleaseJs], function () {
-    var cmd = host + " " + configurePrereleaseJs + " insiders " + packageJson + " " + versionFile;
-    console.log(cmd);
-    exec(cmd);
-}, { async: true });
-
-desc("Configure, build, test, and publish the insiders release.");
-task("publish-insiders", ["configure-insiders", "LKG", "clean", "setDebugMode", "runtests-parallel"], function () {
-    var cmd = "npm publish --tag insiders";
-    console.log(cmd);
-    exec(cmd);
-});
-
-var importDefinitelyTypedTestsDirectory = path.join(scriptsDirectory, "importDefinitelyTypedTests");
-var importDefinitelyTypedTestsJs = path.join(importDefinitelyTypedTestsDirectory, "importDefinitelyTypedTests.js");
-var importDefinitelyTypedTestsTs = path.join(importDefinitelyTypedTestsDirectory, "importDefinitelyTypedTests.ts");
-
-file(importDefinitelyTypedTestsTs);
-file(importDefinitelyTypedTestsJs, ["tsd-scripts", importDefinitelyTypedTestsTs], function () {
-    var cmd = host + " " + LKGCompiler + " -p " + importDefinitelyTypedTestsDirectory;
-    console.log(cmd);
-    exec(cmd);
-}, { async: true });
-
-task("importDefinitelyTypedTests", [importDefinitelyTypedTestsJs], function () {
-    var cmd = host + " " + importDefinitelyTypedTestsJs + " ./ ../DefinitelyTyped";
-    console.log(cmd);
-    exec(cmd);
-}, { async: true });
-
-// Local target to build the compiler and services
-var tscFile = path.join(builtLocalDirectory, compilerFilename);
-compileFile(tscFile, compilerSources, [builtLocalDirectory, copyright].concat(compilerSources), [copyright], /*useBuiltCompiler:*/ false);
-
-var servicesFile = path.join(builtLocalDirectory, "typescriptServices.js");
-var standaloneDefinitionsFile = path.join(builtLocalDirectory, "typescriptServices.d.ts");
-var nodePackageFile = path.join(builtLocalDirectory, "typescript.js");
-var nodeDefinitionsFile = path.join(builtLocalDirectory, "typescript.d.ts");
-var nodeStandaloneDefinitionsFile = path.join(builtLocalDirectory, "typescript_standalone.d.ts");
-
-compileFile(servicesFile, servicesSources, [builtLocalDirectory, copyright].concat(servicesSources),
-            /*prefixes*/[copyright],
-            /*useBuiltCompiler*/ true,
-            /*opts*/ {
-        noOutFile: false,
-        generateDeclarations: true,
-        preserveConstEnums: true,
-        keepComments: true,
-        noResolve: false,
-        stripInternal: true
-    },
-            /*callback*/ function () {
-        jake.cpR(servicesFile, nodePackageFile, { silent: true });
-
-        prependFile(copyright, standaloneDefinitionsFile);
-
-        // Stanalone/web definition file using global 'ts' namespace
-        jake.cpR(standaloneDefinitionsFile, nodeDefinitionsFile, { silent: true });
-        var definitionFileContents = fs.readFileSync(nodeDefinitionsFile).toString();
-        definitionFileContents = removeConstModifierFromEnumDeclarations(definitionFileContents);
-        fs.writeFileSync(standaloneDefinitionsFile, definitionFileContents);
-
-        // Official node package definition file, pointed to by 'typings' in package.json
-        // Created by appending 'export = ts;' at the end of the standalone file to turn it into an external module
-        var nodeDefinitionsFileContents = definitionFileContents + "\nexport = ts;";
-        fs.writeFileSync(nodeDefinitionsFile, nodeDefinitionsFileContents);
-
-        // Node package definition file to be distributed without the package. Created by replacing
-        // 'ts' namespace with '"typescript"' as a module.
-        var nodeStandaloneDefinitionsFileContents = definitionFileContents.replace(/declare (namespace|module) ts/g, 'declare module "typescript"');
-        fs.writeFileSync(nodeStandaloneDefinitionsFile, nodeStandaloneDefinitionsFileContents);
-    });
-
-file(typescriptServicesDts, [servicesFile]);
-
-var cancellationTokenFile = path.join(builtLocalDirectory, "cancellationToken.js");
-compileFile(cancellationTokenFile, cancellationTokenSources, [builtLocalDirectory].concat(cancellationTokenSources), /*prefixes*/ [copyright], /*useBuiltCompiler*/ true, { types: ["node"], outDir: builtLocalDirectory, noOutFile: true, lib: "es6" });
-
-var typingsInstallerFile = path.join(builtLocalDirectory, "typingsInstaller.js");
-compileFile(typingsInstallerFile, typingsInstallerSources, [builtLocalDirectory].concat(typingsInstallerSources), /*prefixes*/ [copyright], /*useBuiltCompiler*/ true, { types: ["node"], outDir: builtLocalDirectory, noOutFile: false, lib: "es6" });
-
-var watchGuardFile = path.join(builtLocalDirectory, "watchGuard.js");
-compileFile(watchGuardFile, watchGuardSources, [builtLocalDirectory].concat(watchGuardSources), /*prefixes*/ [copyright], /*useBuiltCompiler*/ true, { types: ["node"], outDir: builtLocalDirectory, noOutFile: false, lib: "es6" });
-
-var serverFile = path.join(builtLocalDirectory, "tsserver.js");
-compileFile(serverFile, serverSources, [builtLocalDirectory, copyright, cancellationTokenFile, typingsInstallerFile, watchGuardFile].concat(serverSources).concat(servicesSources), /*prefixes*/ [copyright], /*useBuiltCompiler*/ true, { types: ["node"], preserveConstEnums: true, lib: "es6" });
-var tsserverLibraryFile = path.join(builtLocalDirectory, "tsserverlibrary.js");
-var tsserverLibraryDefinitionFile = path.join(builtLocalDirectory, "tsserverlibrary.d.ts");
-file(typesMapOutputPath, /** @type {*} */(function() {
-    var content = fs.readFileSync(path.join(serverDirectory, 'typesMap.json'));
+file(Paths.typesMapOutput, /** @type {*} */(function () {
+    var content = fs.readFileSync(path.join(Paths.srcServer, 'typesMap.json'));
     // Validate that it's valid JSON
     try {
         JSON.parse(content.toString());
     } catch (e) {
         console.log("Parse error in typesMap.json: " + e);
     }
-    fs.writeFileSync(typesMapOutputPath, content);
+    fs.writeFileSync(Paths.typesMapOutput, content);
 }));
-compileFile(
-    tsserverLibraryFile,
-    languageServiceLibrarySources,
-    [builtLocalDirectory, copyright, builtLocalCompiler].concat(languageServiceLibrarySources).concat(libraryTargets),
-    /*prefixes*/[copyright],
-    /*useBuiltCompiler*/ true,
-    { noOutFile: false, generateDeclarations: true, stripInternal: true, preserveConstEnums: true, keepComments: true },
-    /*callback*/ function () {
-        prependFile(copyright, tsserverLibraryDefinitionFile);
 
-        // Appending exports at the end of the server library
-        var tsserverLibraryDefinitionFileContents =
-            fs.readFileSync(tsserverLibraryDefinitionFile).toString() +
-            "\nexport = ts;" +
-            "\nexport as namespace ts;";
-        tsserverLibraryDefinitionFileContents = removeConstModifierFromEnumDeclarations(tsserverLibraryDefinitionFileContents);
-
-        fs.writeFileSync(tsserverLibraryDefinitionFile, tsserverLibraryDefinitionFileContents);
-    });
-
-// Local target to build the language service server library
-desc("Builds language service server library");
-task("lssl", [tsserverLibraryFile, tsserverLibraryDefinitionFile, typesMapOutputPath]);
-
-desc("Emit the start of the build fold");
-task("build-fold-start", [], function () {
-    if (fold.isTravis()) console.log(fold.start("build"));
+file(Paths.tsserverLibraryFile, [TaskNames.coreBuild, Paths.copyright, ...libraryTargets], function() {
+    // fs.writeFileSync(Paths.tsserverLibraryFile, fs.readFileSync(path.join(Paths.builtLocal, "server.js"), { encoding: 'utf-8'}));
+    fs.writeFileSync(Paths.tsserverLibraryFile, "wat");
 });
 
-desc("Emit the end of the build fold");
-task("build-fold-end", [], function () {
-    if (fold.isTravis()) console.log(fold.end("build"));
+file(Paths.tsserverLibraryDefinitionFile, [TaskNames.coreBuild, Paths.copyright, ...libraryTargets], function () {
+    const content = fs.readFileSync(Paths.servicesFile, { encoding: 'utf-8' });
+    const newContent =
+        removeConstModifierFromEnumDeclarations(content) +
+        `\nexport = ts` +
+        `\nexport as namespace ts;`;
+
+    fs.writeFileSync(Paths.tsserverLibraryDefinitionFile, newContent, { encoding: 'utf-8' });
 });
 
-// Local target to build the compiler and services
-desc("Builds the full compiler and services");
-task("local", ["build-fold-start", "generate-diagnostics", "lib", tscFile, servicesFile, nodeDefinitionsFile, serverFile, buildProtocolDts, builtGeneratedDiagnosticMessagesJSON, "lssl", "localize", "build-fold-end"]);
-
-// Local target to build only tsc.js
-desc("Builds only the compiler");
-task("tsc", ["generate-diagnostics", "lib", tscFile]);
-
-// Local target to build the compiler and services
-desc("Sets release mode flag");
-task("release", function () {
-    useDebugMode = false;
-});
-
-// Set the default task to "local"
-task("default", ["local"]);
-
-// Cleans the built directory
-desc("Cleans the compiler output, declare files, and tests");
-task("clean", function () {
-    jake.rmRf(builtDirectory);
-});
-
-// Generate Markdown spec
-var word2mdJs = path.join(scriptsDirectory, "word2md.js");
-var word2mdTs = path.join(scriptsDirectory, "word2md.ts");
-var specWord = path.join(docDirectory, "TypeScript Language Specification.docx");
-var specMd = path.join(docDirectory, "spec.md");
-
-file(word2mdTs);
-
-// word2md script
-compileFile(word2mdJs,
-    [word2mdTs],
-    [word2mdTs],
-    [],
-    /*useBuiltCompiler*/ false,
-    {
-        lib: "scripthost,es5"
+function getLibraryTargets() {
+    return libraries.libs.map(function (lib) {
+        var relativeSources = ["header.d.ts"].concat(libraries.sources && libraries.sources[lib] || [lib + ".d.ts"]);
+        var relativeTarget = libraries.paths && libraries.paths[lib] || ("lib." + lib + ".d.ts");
+        var sources = [Paths.copyright].concat(relativeSources.map(s => path.join(Paths.library, s)));
+        var target = path.join(Paths.builtLocal, relativeTarget);
+        file(target, [Paths.builtLocal].concat(sources), function () {
+            concatenateFiles(target, sources);
+        });
+        return target;
     });
-
-// The generated spec.md; built for the 'generate-spec' task
-file(specMd, [word2mdJs, specWord], function () {
-    var specWordFullPath = path.resolve(specWord);
-    var specMDFullPath = path.resolve(specMd);
-    var cmd = "cscript //nologo " + word2mdJs + ' "' + specWordFullPath + '" ' + '"' + specMDFullPath + '"';
-    console.log(cmd);
-    child_process.exec(cmd, function () {
-        complete();
-    });
-}, { async: true });
-
-
-desc("Generates a Markdown version of the Language Specification");
-task("generate-spec", [specMd]);
-
-
-// Makes a new LKG. This target does not build anything, but errors if not all the outputs are present in the built/local directory
-desc("Makes a new LKG out of the built js files");
-task("LKG", ["clean", "release", "local"].concat(libraryTargets), () => {
-    const sizeBefore = getDirSize(LKGDirectory);
-    var expectedFiles = [tscFile, servicesFile, serverFile, nodePackageFile, nodeDefinitionsFile, standaloneDefinitionsFile, tsserverLibraryFile, tsserverLibraryDefinitionFile, cancellationTokenFile, typingsInstallerFile, buildProtocolDts, watchGuardFile].
-        concat(libraryTargets).
-        concat(localizationTargets);
-    var missingFiles = expectedFiles.filter(f => !fs.existsSync(f));
-    if (missingFiles.length > 0) {
-        fail(new Error("Cannot replace the LKG unless all built targets are present in directory " + builtLocalDirectory +
-            ". The following files are missing:\n" + missingFiles.join("\n")));
-    }
-    // Copy all the targets into the LKG directory
-    jake.mkdirP(LKGDirectory);
-    expectedFiles.forEach(f => jake.cpR(f, LKGDirectory));
-
-    const sizeAfter = getDirSize(LKGDirectory);
-    if (sizeAfter > (sizeBefore * 1.10)) {
-        throw new Error("The lib folder increased by 10% or more. This likely indicates a bug.");
-    }
-});
-
-// Test directory
-directory(builtLocalDirectory);
-
-// Task to build the tests infrastructure using the built compiler
-var run = path.join(builtLocalDirectory, "run.js");
-compileFile(
-    /*outFile*/ run,
-    /*source*/ harnessSources,
-    /*prereqs*/[builtLocalDirectory, tscFile, tsserverLibraryFile].concat(libraryTargets).concat(servicesSources).concat(harnessSources),
-    /*prefixes*/[],
-    /*useBuiltCompiler:*/ true,
-    /*opts*/ { types: ["node", "mocha", "chai"], lib: "es6" });
-
-var internalTests = "internal/";
-
-var localBaseline = "tests/baselines/local/";
-var refBaseline = "tests/baselines/reference/";
-
-var localRwcBaseline = path.join(internalTests, "baselines/rwc/local");
-var refRwcBaseline = path.join(internalTests, "baselines/rwc/reference");
-
-var localTest262Baseline = path.join(internalTests, "baselines/test262/local");
-var refTest262Baseline = path.join(internalTests, "baselines/test262/reference");
-
-desc("Builds the test infrastructure using the built compiler");
-task("tests", ["local", run].concat(libraryTargets));
-
-function exec(cmd, completeHandler, errorHandler) {
-    var ex = jake.createExec([cmd], /** @type {jake.ExecOptions} */({ windowsVerbatimArguments: true, interactive: true }));
-    // Add listeners for output and error
-    ex.addListener("stdout", function (output) {
-        process.stdout.write(output);
-    });
-    ex.addListener("stderr", function (error) {
-        process.stderr.write(error);
-    });
-    ex.addListener("cmdEnd", function () {
-        if (completeHandler) {
-            completeHandler();
-        }
-        complete();
-    });
-    ex.addListener("error", function (e, status) {
-        if (errorHandler) {
-            errorHandler(e, status);
-        }
-        else {
-            fail("Process exited with code " + status);
-        }
-    });
-
-    ex.run();
-}
-
-const del = require("del");
-function cleanTestDirs() {
-    // Clean the local baselines directory
-    if (fs.existsSync(localBaseline)) {
-        del.sync(localBaseline);
-    }
-
-    // Clean the local Rwc baselines directory
-    if (fs.existsSync(localRwcBaseline)) {
-        del.sync(localRwcBaseline);
-    }
-
-    jake.mkdirP(localRwcBaseline);
-    jake.mkdirP(localTest262Baseline);
-    jake.mkdirP(localBaseline);
-}
-
-// used to pass data from jake command line directly to run.js
-function writeTestConfigFile(tests, runners, light, taskConfigsFolder, workerCount, stackTraceLimit, colors, testTimeout) {
-    var testConfigContents = JSON.stringify({
-        runners: runners ? runners.split(",") : undefined,
-        test: tests ? [tests] : undefined,
-        light: light,
-        workerCount: workerCount,
-        taskConfigsFolder: taskConfigsFolder,
-        stackTraceLimit: stackTraceLimit,
-        noColor: !colors,
-        timeout: testTimeout
-    });
-    fs.writeFileSync('test.config', testConfigContents);
-}
-
-function deleteTemporaryProjectOutput() {
-    if (fs.existsSync(path.join(localBaseline, "projectOutput/"))) {
-        jake.rmRf(path.join(localBaseline, "projectOutput/"));
-    }
 }
 
 function runConsoleTests(defaultReporter, runInParallel) {
@@ -803,7 +352,7 @@ function runConsoleTests(defaultReporter, runInParallel) {
     // timeout normally isn't necessary but Travis-CI has been timing out on compiler baselines occasionally
     // default timeout is 2sec which really should be enough, but maybe we just need a small amount longer
     if (!runInParallel) {
-        var startTime = mark();
+        var startTime = Travis.mark();
         var args = [];
         args.push("-R", reporter);
         if (tests) {
@@ -827,7 +376,7 @@ function runConsoleTests(defaultReporter, runInParallel) {
         else {
             args.push("-t", testTimeout);
         }
-        args.push(run);
+        args.push(Paths.builtLocalRun);
 
         var cmd = "mocha " + args.join(" ");
         console.log(cmd);
@@ -836,12 +385,12 @@ function runConsoleTests(defaultReporter, runInParallel) {
         process.env.NODE_ENV = "development";
         exec(cmd, function () {
             process.env.NODE_ENV = savedNodeEnv;
-            measure(startTime);
+            Travis.measure(startTime);
             runLinter();
             finish();
         }, function (e, status) {
             process.env.NODE_ENV = savedNodeEnv;
-            measure(startTime);
+            Travis.measure(startTime);
             finish(status);
         });
 
@@ -849,15 +398,17 @@ function runConsoleTests(defaultReporter, runInParallel) {
     else {
         var savedNodeEnv = process.env.NODE_ENV;
         process.env.NODE_ENV = "development";
-        var startTime = mark();
-        exec(host + " " + run, function () {
+        var startTime = Travis.mark();
+        exec(host + " " + Paths.builtLocalRun, function () {
             process.env.NODE_ENV = savedNodeEnv;
-            measure(startTime);
-            runLinter();
+            Travis.measure(startTime);
+            var lint = jake.Task["lint"];
+            lint.addListener("complete", () => finish());
+            lint.invoke();
             finish();
         }, function (e, status) {
             process.env.NODE_ENV = savedNodeEnv;
-            measure(startTime);
+            Travis.measure(startTime);
             finish(status);
         });
     }
@@ -885,59 +436,166 @@ function runConsoleTests(defaultReporter, runInParallel) {
         });
         lint.invoke();
     }
+
+    // used to pass data from jake command line directly to run.js
+    function writeTestConfigFile(tests, runners, light, taskConfigsFolder, workerCount, stackTraceLimit, colors, testTimeout) {
+        var testConfigContents = JSON.stringify({
+            runners: runners ? runners.split(",") : undefined,
+            test: tests ? [tests] : undefined,
+            light: light,
+            workerCount: workerCount,
+            taskConfigsFolder: taskConfigsFolder,
+            stackTraceLimit: stackTraceLimit,
+            noColor: !colors,
+            timeout: testTimeout
+        });
+        fs.writeFileSync('test.config', testConfigContents);
+    }
+
+    function deleteTemporaryProjectOutput() {
+        if (fs.existsSync(path.join(Paths.baselines.local, "projectOutput/"))) {
+            jake.rmRf(path.join(Paths.baselines.local, "projectOutput/"));
+        }
+    }
 }
 
-desc("Runs all the tests in parallel using the built run.js file. Optional arguments are: t[ests]=category1|category2|... d[ebug]=true.");
-task("runtests-parallel", ["build-rules", "tests", builtLocalDirectory], function () {
-    runConsoleTests('min', /*runInParallel*/ true);
-}, { async: true });
-
-desc("Runs the tests using the built run.js file. Optional arguments are: t[ests]=regex r[eporter]=[list|spec|json|<more>] d[ebug]=true color[s]=false lint=true bail=false dirty=false.");
-task("runtests", ["build-rules", "tests", builtLocalDirectory], function() {
-    runConsoleTests('mocha-fivemat-progress-reporter', /*runInParallel*/ false);
-}, { async: true });
-
-desc("Generates code coverage data via instanbul");
-task("generate-code-coverage", ["tests", builtLocalDirectory], function () {
-    var testTimeout = process.env.timeout || defaultTestTimeout;
-    var cmd = 'istanbul cover node_modules/mocha/bin/_mocha -- -R min -t ' + testTimeout + ' ' + run;
-    console.log(cmd);
-    exec(cmd);
-}, { async: true });
-
-// Browser tests
-var nodeServerOutFile = "tests/webTestServer.js";
-var nodeServerInFile = "tests/webTestServer.ts";
-compileFile(nodeServerOutFile, [nodeServerInFile], [builtLocalDirectory, tscFile], [], /*useBuiltCompiler:*/ true, { noOutFile: true, lib: "es6" });
-
-desc("Runs browserify on run.js to produce a file suitable for running tests in the browser");
-task("browserify", [], function() {
-    // Shell out to `gulp`, since we do the work to handle sourcemaps correctly w/o inline maps there
-    var cmd = 'gulp browserify --silent';
-    exec(cmd);
-}, { async: true });
-
-desc("Runs the tests using the built run.js file like 'jake runtests'. Syntax is jake runtests-browser. Additional optional parameters tests=[regex], browser=[chrome|IE]");
-task("runtests-browser", ["browserify", nodeServerOutFile], function () {
-    cleanTestDirs();
-    host = "node";
-    var browser = process.env.browser || process.env.b ||  (os.platform() === "win32" ? "edge" : "chrome");
-    var runners = process.env.runners || process.env.runner || process.env.ru;
-    var tests = process.env.test || process.env.tests || process.env.t;
-    var light = process.env.light || false;
-    var testConfigFile = 'test.config';
-    if (fs.existsSync(testConfigFile)) {
-        fs.unlinkSync(testConfigFile);
-    }
-    if (tests || runners || light) {
-        writeTestConfigFile(tests, runners, light);
+function cleanTestDirs() {
+    // Clean the local baselines directory
+    if (fs.existsSync(Paths.baselines.local)) {
+        del.sync(Paths.baselines.local);
     }
 
-    tests = tests ? tests : '';
-    var cmd = host + " tests/webTestServer.js " + browser + " " + JSON.stringify(tests);
-    console.log(cmd);
-    exec(cmd);
-}, { async: true });
+    // Clean the local Rwc baselines directory
+    if (fs.existsSync(Paths.baselines.localRwc)) {
+        del.sync(Paths.baselines.localRwc);
+    }
+
+    jake.mkdirP(Paths.baselines.local);
+    jake.mkdirP(Paths.baselines.localRwc);
+    jake.mkdirP(Paths.baselines.localTest262);
+}
+
+function tsbuild(tsconfigPath, useLkg = true, done = undefined) {
+    const startCompileTime = Travis.mark();
+
+    const compilerPath = useLkg ? Paths.lkgCompiler : Paths.builtLocalCompiler;
+    const cmd = `${host} ${compilerPath} -b -v ${Array.isArray(tsconfigPath) ? tsconfigPath.join(" ") : tsconfigPath}`;
+
+    var ex = jake.createExec([cmd]);
+    // Add listeners for output and error
+    ex.addListener("stdout", function (output) {
+        process.stdout.write(output);
+    });
+    ex.addListener("stderr", function (error) {
+        process.stderr.write(error);
+    });
+    ex.addListener("cmdEnd", function () {
+        Travis.measure(startCompileTime);
+        done && done();
+    });
+    ex.addListener("error", function () {
+        fail(`Compilation of ${tsconfigPath} unsuccessful`);
+        Travis.measure(startCompileTime);
+    });
+    ex.run();
+}
+
+const Travis = {
+    mark() {
+        if (!fold.isTravis()) return;
+        var stamp = process.hrtime();
+        var id = Math.floor(Math.random() * 0xFFFFFFFF).toString(16);
+        console.log("travis_time:start:" + id + "\r");
+        return {
+            stamp: stamp,
+            id: id
+        };
+    },
+    measure(marker) {
+        if (!fold.isTravis()) return;
+        var diff = process.hrtime(marker.stamp);
+        var total = [marker.stamp[0] + diff[0], marker.stamp[1] + diff[1]];
+        console.log("travis_time:end:" + marker.id + ":start=" + toNs(marker.stamp) + ",finish=" + toNs(total) + ",duration=" + toNs(diff) + "\r");
+    }
+};
+
+function toNs(diff) {
+    return diff[0] * 1e9 + diff[1];
+}
+
+function exec(cmd, completeHandler, errorHandler) {
+    var ex = jake.createExec([cmd], /** @type {jake.ExecOptions} */({ windowsVerbatimArguments: true, interactive: true }));
+    // Add listeners for output and error
+    ex.addListener("stdout", function (output) {
+        process.stdout.write(output);
+    });
+    ex.addListener("stderr", function (error) {
+        process.stderr.write(error);
+    });
+    ex.addListener("cmdEnd", function () {
+        if (completeHandler) {
+            completeHandler();
+        }
+        complete();
+    });
+    ex.addListener("error", function (e, status) {
+        if (errorHandler) {
+            errorHandler(e, status);
+        }
+        else {
+            fail("Process exited with code " + status);
+        }
+    });
+
+    ex.run();
+}
+
+/** @param jsonPath {string} */
+function readJson(jsonPath) {
+    const jsonText = fs.readFileSync(jsonPath, "utf8");
+    const result = ts.parseConfigFileTextToJson(jsonPath, jsonText);
+    if (result.error) {
+        reportDiagnostics([result.error]);
+        throw new Error("An error occurred during parse.");
+    }
+    return result.config;
+}
+
+/** @param diagnostics {ts.Diagnostic[]} */
+function reportDiagnostics(diagnostics) {
+    console.log(diagnosticsToString(diagnostics, process.stdout.isTTY));
+}
+
+/**
+ * @param diagnostics {ts.Diagnostic[]}
+ * @param [pretty] {boolean}
+ */
+function diagnosticsToString(diagnostics, pretty) {
+    const host = {
+        getCurrentDirectory() { return process.cwd(); },
+        getCanonicalFileName(fileName) { return fileName; },
+        getNewLine() { return os.EOL; }
+    };
+    return pretty ? ts.formatDiagnosticsWithColorAndContext(diagnostics, host) :
+        ts.formatDiagnostics(diagnostics, host);
+}
+
+// concatenate a list of sourceFiles to a destinationFile
+function concatenateFiles(destinationFile, sourceFiles) {
+    var temp = "temptemp";
+    // append all files in sequence
+    var text = "";
+    for (var i = 0; i < sourceFiles.length; i++) {
+        if (!fs.existsSync(sourceFiles[i])) {
+            fail(sourceFiles[i] + " does not exist!");
+        }
+        if (i > 0) { text += "\n\n"; }
+        text += fs.readFileSync(sourceFiles[i]).toString().replace(/\r?\n/g, "\n");
+    }
+    fs.writeFileSync(temp, text);
+    // Move the file to the final destination
+    fs.renameSync(temp, destinationFile);
+}
 
 function getDiffTool() {
     var program = process.env['DIFF'];
@@ -947,183 +605,6 @@ function getDiffTool() {
     return program;
 }
 
-// Baseline Diff
-desc("Diffs the compiler baselines using the diff tool specified by the 'DIFF' environment variable");
-task('diff', function () {
-    var cmd = '"' + getDiffTool() + '" ' + refBaseline + ' ' + localBaseline;
-    console.log(cmd);
-    exec(cmd);
-}, { async: true });
-
-desc("Diffs the RWC baselines using the diff tool specified by the 'DIFF' environment variable");
-task('diff-rwc', function () {
-    var cmd = '"' + getDiffTool() + '" ' + refRwcBaseline + ' ' + localRwcBaseline;
-    console.log(cmd);
-    exec(cmd);
-}, { async: true });
-
-desc("Builds the test sources and automation in debug mode");
-task("tests-debug", ["setDebugMode", "tests"]);
-
-
-// Makes the test results the new baseline
-desc("Makes the most recent test results the new baseline, overwriting the old baseline");
-task("baseline-accept", function () {
-    acceptBaseline(localBaseline, refBaseline);
-});
-
-function acceptBaseline(sourceFolder, targetFolder) {
-    console.log('Accept baselines from ' + sourceFolder + ' to ' + targetFolder);
-    var deleteEnding = '.delete';
-
-    acceptBaselineFolder(sourceFolder, targetFolder);
-
-    function acceptBaselineFolder(sourceFolder, targetFolder) {
-        var files = fs.readdirSync(sourceFolder);
-
-        for (var i in files) {
-            var filename = files[i];
-            var fullLocalPath = path.join(sourceFolder, filename);
-            var stat = fs.statSync(fullLocalPath);
-            if (stat.isFile()) {
-                if (filename.substr(filename.length - deleteEnding.length) === deleteEnding) {
-                    filename = filename.substr(0, filename.length - deleteEnding.length);
-                    fs.unlinkSync(path.join(targetFolder, filename));
-                }
-                else {
-                    var target = path.join(targetFolder, filename);
-                    if (fs.existsSync(target)) {
-                        fs.unlinkSync(target);
-                    }
-                    jake.mkdirP(path.dirname(target));
-                    fs.renameSync(path.join(sourceFolder, filename), target);
-                }
-            }
-            else if (stat.isDirectory()) {
-                acceptBaselineFolder(fullLocalPath, path.join(targetFolder, filename));
-            }
-        }
-    }
+function removeConstModifierFromEnumDeclarations(text) {
+    return text.replace(/^(\s*)(export )?const enum (\S+) {(\s*)$/gm, '$1$2enum $3 {$4');
 }
-
-desc("Makes the most recent rwc test results the new baseline, overwriting the old baseline");
-task("baseline-accept-rwc", function () {
-    acceptBaseline(localRwcBaseline, refRwcBaseline);
-});
-
-desc("Makes the most recent test262 test results the new baseline, overwriting the old baseline");
-task("baseline-accept-test262", function () {
-    acceptBaseline(localTest262Baseline, refTest262Baseline);
-});
-
-
-// Webhost
-var webhostPath = "tests/webhost/webtsc.ts";
-var webhostJsPath = "tests/webhost/webtsc.js";
-compileFile(webhostJsPath, [webhostPath], [tscFile, webhostPath].concat(libraryTargets), [], /*useBuiltCompiler*/true);
-
-desc("Builds the tsc web host");
-task("webhost", [webhostJsPath], function () {
-    jake.cpR(path.join(builtLocalDirectory, "lib.d.ts"), "tests/webhost/", { silent: true });
-});
-
-// Perf compiler
-var perftscPath = "tests/perftsc.ts";
-var perftscJsPath = "built/local/perftsc.js";
-compileFile(perftscJsPath, [perftscPath], [tscFile, perftscPath, "tests/perfsys.ts"].concat(libraryTargets), [], /*useBuiltCompiler*/ true);
-desc("Builds augmented version of the compiler for perf tests");
-task("perftsc", [perftscJsPath]);
-
-// Instrumented compiler
-var loggedIOpath = harnessDirectory + 'loggedIO.ts';
-var loggedIOJsPath = builtLocalDirectory + 'loggedIO.js';
-file(loggedIOJsPath, [builtLocalDirectory, loggedIOpath], function () {
-    var temp = builtLocalDirectory + 'temp';
-    jake.mkdirP(temp);
-    var options = "--target es5 --lib es6 --types --outdir " + temp + ' ' + loggedIOpath;
-    var cmd = host + " " + LKGDirectory + compilerFilename + " " + options + " ";
-    console.log(cmd + "\n");
-    var ex = jake.createExec([cmd]);
-    ex.addListener("cmdEnd", function () {
-        fs.renameSync(temp + '/harness/loggedIO.js', loggedIOJsPath);
-        jake.rmRf(temp);
-        complete();
-    });
-    ex.run();
-}, { async: true });
-
-var instrumenterPath = harnessDirectory + 'instrumenter.ts';
-var instrumenterJsPath = builtLocalDirectory + 'instrumenter.js';
-compileFile(instrumenterJsPath, [instrumenterPath], [tscFile, instrumenterPath].concat(libraryTargets), [], /*useBuiltCompiler*/ true, { lib: "es6", types: ["node"], noOutFile: true, outDir: builtLocalDirectory });
-
-desc("Builds an instrumented tsc.js - run with test=[testname]");
-task('tsc-instrumented', [loggedIOJsPath, instrumenterJsPath, tscFile], function () {
-    var test = process.env.test || process.env.tests || process.env.t || "iocapture";
-    var cmd = host + ' ' + instrumenterJsPath + " record " + test + " " + builtLocalDirectory + compilerFilename;
-    console.log(cmd);
-    var ex = jake.createExec([cmd]);
-    ex.addListener("cmdEnd", function () {
-        complete();
-    });
-    ex.run();
-}, { async: true });
-
-desc("Updates the sublime plugin's tsserver");
-task("update-sublime", ["local", serverFile], function () {
-    jake.cpR(serverFile, "../TypeScript-Sublime-Plugin/tsserver/");
-    jake.cpR(serverFile + ".map", "../TypeScript-Sublime-Plugin/tsserver/");
-});
-
-var tslintRuleDir = "scripts/tslint/rules";
-var tslintRules = fs.readdirSync(tslintRuleDir);
-var tslintRulesFiles = tslintRules.map(function (p) {
-    return path.join(tslintRuleDir, p);
-});
-var tslintRulesOutFiles = tslintRules.map(function (p) {
-    return path.join(builtLocalDirectory, "tslint/rules", p.replace(".ts", ".js"));
-});
-var tslintFormattersDir = "scripts/tslint/formatters";
-var tslintFormatters = [
-    "autolinkableStylishFormatter",
-];
-var tslintFormatterFiles = tslintFormatters.map(function (p) {
-    return path.join(tslintFormattersDir, p + ".ts");
-});
-var tslintFormattersOutFiles = tslintFormatters.map(function (p) {
-    return path.join(builtLocalDirectory, "tslint/formatters", p + ".js");
-});
-desc("Compiles tslint rules to js");
-task("build-rules", ["build-rules-start"].concat(tslintRulesOutFiles).concat(tslintFormattersOutFiles).concat(["build-rules-end"]));
-tslintRulesFiles.forEach(function (ruleFile, i) {
-    compileFile(tslintRulesOutFiles[i], [ruleFile], [ruleFile], [], /*useBuiltCompiler*/ false,
-        { noOutFile: true, generateDeclarations: false, outDir: path.join(builtLocalDirectory, "tslint/rules"), lib: "es6" });
-});
-tslintFormatterFiles.forEach(function (ruleFile, i) {
-    compileFile(tslintFormattersOutFiles[i], [ruleFile], [ruleFile], [], /*useBuiltCompiler*/ false,
-        { noOutFile: true, generateDeclarations: false, outDir: path.join(builtLocalDirectory, "tslint/formatters"), lib: "es6" });
-});
-
-desc("Emit the start of the build-rules fold");
-task("build-rules-start", [], function () {
-    if (fold.isTravis()) console.log(fold.start("build-rules"));
-});
-
-desc("Emit the end of the build-rules fold");
-task("build-rules-end", [], function () {
-    if (fold.isTravis()) console.log(fold.end("build-rules"));
-});
-
-desc("Runs tslint on the compiler sources. Optional arguments are: f[iles]=regex");
-task("lint", ["build-rules"], () => {
-    if (fold.isTravis()) console.log(fold.start("lint"));
-    function lint(project, cb) {
-        const fix = process.env.fix || process.env.f;
-        const cmd = `node node_modules/tslint/bin/tslint --project ${project} --formatters-dir ./built/local/tslint/formatters --format autolinkableStylish${fix ? " --fix" : ""}`;
-        console.log("Linting: " + cmd);
-        jake.exec([cmd], cb, /** @type {jake.ExecOptions} */({ interactive: true, windowsVerbatimArguments: true }));
-    }
-    lint("scripts/tslint/tsconfig.json", () => lint("src/tsconfig-base.json", () => {
-        if (fold.isTravis()) console.log(fold.end("lint"));
-        complete();
-    }));
-});
diff --git a/src/compiler/program.ts b/src/compiler/program.ts
index b08f966864a..856f9580f0e 100644
--- a/src/compiler/program.ts
+++ b/src/compiler/program.ts
@@ -349,7 +349,7 @@ namespace ts {
 
             output += host.getNewLine();
         }
-        return output + host.getNewLine();
+        return output;
     }
 
     export function flattenDiagnosticMessageText(messageText: string | DiagnosticMessageChain | undefined, newLine: string): string {
diff --git a/src/compiler/resolutionCache.ts b/src/compiler/resolutionCache.ts
index 4614c3bede4..de84b9bb665 100644
--- a/src/compiler/resolutionCache.ts
+++ b/src/compiler/resolutionCache.ts
@@ -33,10 +33,10 @@ namespace ts {
         resolvedFileName: string | undefined;
     }
 
-    interface CachedResolvedModuleWithFailedLookupLocations extends ts.ResolvedModuleWithFailedLookupLocations, ResolutionWithFailedLookupLocations {
+    interface CachedResolvedModuleWithFailedLookupLocations extends ResolvedModuleWithFailedLookupLocations, ResolutionWithFailedLookupLocations {
     }
 
-    interface ResolvedTypeReferenceDirectiveWithFailedLookupLocations extends ts.ResolvedTypeReferenceDirectiveWithFailedLookupLocations, ResolutionWithFailedLookupLocations {
+    interface CachedResolvedTypeReferenceDirectiveWithFailedLookupLocations extends ResolvedTypeReferenceDirectiveWithFailedLookupLocations, ResolutionWithFailedLookupLocations {
     }
 
     export interface ResolutionCacheHost extends ModuleResolutionHost {
@@ -95,8 +95,8 @@ namespace ts {
             resolutionHost.getCanonicalFileName
         );
 
-        const resolvedTypeReferenceDirectives = createMap<Map<ResolvedTypeReferenceDirectiveWithFailedLookupLocations>>();
-        const perDirectoryResolvedTypeReferenceDirectives = createMap<Map<ResolvedTypeReferenceDirectiveWithFailedLookupLocations>>();
+        const resolvedTypeReferenceDirectives = createMap<Map<CachedResolvedTypeReferenceDirectiveWithFailedLookupLocations>>();
+        const perDirectoryResolvedTypeReferenceDirectives = createMap<Map<CachedResolvedTypeReferenceDirectiveWithFailedLookupLocations>>();
 
         /**
          * These are the extensions that failed lookup files will have by default,
@@ -137,7 +137,7 @@ namespace ts {
             return resolution.resolvedModule;
         }
 
-        function getResolvedTypeReferenceDirective(resolution: ResolvedTypeReferenceDirectiveWithFailedLookupLocations) {
+        function getResolvedTypeReferenceDirective(resolution: CachedResolvedTypeReferenceDirectiveWithFailedLookupLocations) {
             return resolution.resolvedTypeReferenceDirective;
         }
 
@@ -319,7 +319,7 @@ namespace ts {
         }
 
         function resolveTypeReferenceDirectives(typeDirectiveNames: string[], containingFile: string): ResolvedTypeReferenceDirective[] {
-            return resolveNamesWithLocalCache<ResolvedTypeReferenceDirectiveWithFailedLookupLocations, ResolvedTypeReferenceDirective>(
+            return resolveNamesWithLocalCache<CachedResolvedTypeReferenceDirectiveWithFailedLookupLocations, ResolvedTypeReferenceDirective>(
                 typeDirectiveNames, containingFile,
                 resolvedTypeReferenceDirectives, perDirectoryResolvedTypeReferenceDirectives,
                 resolveTypeReferenceDirective, getResolvedTypeReferenceDirective,
diff --git a/src/core/core.ts b/src/core/core.ts
index 4797f3f085b..20a4677d672 100644
--- a/src/core/core.ts
+++ b/src/core/core.ts
@@ -62,7 +62,7 @@ namespace ts {
     export interface Push<T> {
         push(...values: T[]): void;
     }
-    
+
     /** Create a MapLike with good performance. */
     function createDictionaryObject<T>(): MapLike<T> {
         const map = Object.create(/*prototype*/ null); // tslint:disable-line:no-null-keyword
diff --git a/src/harness/fourslash.ts b/src/harness/fourslash.ts
index 86c83bd73e2..8045f3a948b 100644
--- a/src/harness/fourslash.ts
+++ b/src/harness/fourslash.ts
@@ -9,8 +9,7 @@ namespace FourSlash {
         ShimsWithPreprocess,
         Server
     }
-    
-    
+
     // Represents a parsed source file with metadata
     interface FourSlashFile {
         // The contents of the file (with markers, etc stripped out)
diff --git a/src/harness/harness.ts b/src/harness/harness.ts
index f86892648c1..7a3019d9b36 100644
--- a/src/harness/harness.ts
+++ b/src/harness/harness.ts
@@ -7,7 +7,7 @@ var assert: typeof _chai.assert = _chai.assert;
 {
     // chai's builtin `assert.isFalse` is featureful but slow - we don't use those features,
     // so we'll just overwrite it as an alterative to migrating a bunch of code off of chai
-    assert.isFalse = (expr, msg) => { if (expr as any as boolean !== false) throw new Error(msg); };
+    assert.isFalse = (expr: any, msg: string) => { if (expr !== false) throw new Error(msg); };
 
     const assertDeepImpl = assert.deepEqual;
     assert.deepEqual = (a, b, msg) => {
diff --git a/src/parser/utilities.ts b/src/parser/utilities.ts
index 52e81dd517c..83e56d81631 100644
--- a/src/parser/utilities.ts
+++ b/src/parser/utilities.ts
@@ -6818,7 +6818,7 @@ namespace ts {
 
         lastChain.next = tailChain;
         return headChain;
-    }    
+    }
 
     function getDiagnosticFilePath(diagnostic: Diagnostic): string | undefined {
         return diagnostic.file ? diagnostic.file.path : undefined;
@@ -6924,12 +6924,6 @@ namespace ts {
         return true;
     }
 
-    
-
-    //
-    // Paths
-    //
-
     /**
      * Internally, we represent paths as strings with '/' as the directory separator.
      * When we make system calls (eg: LanguageServiceHost.getDirectory()),
@@ -6938,7 +6932,6 @@ namespace ts {
     export const directorySeparator = "/";
     const altDirectorySeparator = "\\";
     const urlSchemeSeparator = "://";
-
     const backslashRegExp = /\\/g;
 
     /**
diff --git a/src/server/tsconfig.json b/src/server/tsconfig.json
index 5339673cb9e..2448371dc3e 100644
--- a/src/server/tsconfig.json
+++ b/src/server/tsconfig.json
@@ -2,7 +2,7 @@
     "extends": "../tsconfig-base",
     "compilerOptions": {
         "removeComments": true,
-        "outFile": "../../built/local/tsserverlibrary.js",
+        "outFile": "../../built/local/server.js",
         "preserveConstEnums": true,
         "types": [
             "node"

From b6d527933317f1761e0af021386d461f2af16e88 Mon Sep 17 00:00:00 2001
From: Ryan Cavanaugh <the.ryan.cavanaugh@gmail.com>
Date: Sun, 10 Jun 2018 13:26:16 -0700
Subject: [PATCH 21/37] The baselines are back in town

---
 Jakefile.js                                   | 51 ++++++++++++++++++-
 ...LineContextDiagnosticWithPretty.errors.txt |  1 -
 .../prettyContextNotDebugAssertion.errors.txt |  1 -
 3 files changed, 50 insertions(+), 3 deletions(-)

diff --git a/Jakefile.js b/Jakefile.js
index 3015134ea6c..b3d62dbdaf5 100644
--- a/Jakefile.js
+++ b/Jakefile.js
@@ -127,6 +127,22 @@ task(TaskNames.runtests, [TaskNames.lib], function () {
     runConsoleTests('mocha-fivemat-progress-reporter', /*runInParallel*/ false);;
 }, { async: true });
 
+// Makes the test results the new baseline
+desc("Makes the most recent test results the new baseline, overwriting the old baseline");
+task("baseline-accept", function () {
+    acceptBaseline(Paths.baselines.local, Paths.baselines.reference);
+});
+
+desc("Makes the most recent rwc test results the new baseline, overwriting the old baseline");
+task("baseline-accept-rwc", function () {
+    acceptBaseline(Paths.baselines.localRwc, Paths.baselines.referenceRwc);
+});
+
+desc("Makes the most recent test262 test results the new baseline, overwriting the old baseline");
+task("baseline-accept-test262", function () {
+    acceptBaseline(Paths.baselines.localTest262, Paths.baselines.referenceTest262);
+});
+
 const libraryTargets = getLibraryTargets();
 desc("Builds the library targets");
 task(TaskNames.lib, libraryTargets);
@@ -393,7 +409,6 @@ function runConsoleTests(defaultReporter, runInParallel) {
             Travis.measure(startTime);
             finish(status);
         });
-
     }
     else {
         var savedNodeEnv = process.env.NODE_ENV;
@@ -580,6 +595,40 @@ function diagnosticsToString(diagnostics, pretty) {
         ts.formatDiagnostics(diagnostics, host);
 }
 
+function acceptBaseline(sourceFolder, targetFolder) {
+    console.log('Accept baselines from ' + sourceFolder + ' to ' + targetFolder);
+    var deleteEnding = '.delete';
+
+    acceptBaselineFolder(sourceFolder, targetFolder);
+
+    function acceptBaselineFolder(sourceFolder, targetFolder) {
+        var files = fs.readdirSync(sourceFolder);
+
+        for (var i in files) {
+            var filename = files[i];
+            var fullLocalPath = path.join(sourceFolder, filename);
+            var stat = fs.statSync(fullLocalPath);
+            if (stat.isFile()) {
+                if (filename.substr(filename.length - deleteEnding.length) === deleteEnding) {
+                    filename = filename.substr(0, filename.length - deleteEnding.length);
+                    fs.unlinkSync(path.join(targetFolder, filename));
+                }
+                else {
+                    var target = path.join(targetFolder, filename);
+                    if (fs.existsSync(target)) {
+                        fs.unlinkSync(target);
+                    }
+                    jake.mkdirP(path.dirname(target));
+                    fs.renameSync(path.join(sourceFolder, filename), target);
+                }
+            }
+            else if (stat.isDirectory()) {
+                acceptBaselineFolder(fullLocalPath, path.join(targetFolder, filename));
+            }
+        }
+    }
+}
+
 // concatenate a list of sourceFiles to a destinationFile
 function concatenateFiles(destinationFile, sourceFiles) {
     var temp = "temptemp";
diff --git a/tests/baselines/reference/multiLineContextDiagnosticWithPretty.errors.txt b/tests/baselines/reference/multiLineContextDiagnosticWithPretty.errors.txt
index b0cea3122be..c6b8095d15b 100644
--- a/tests/baselines/reference/multiLineContextDiagnosticWithPretty.errors.txt
+++ b/tests/baselines/reference/multiLineContextDiagnosticWithPretty.errors.txt
@@ -9,7 +9,6 @@
   ~~~~~
 
 
-
 ==== tests/cases/compiler/multiLineContextDiagnosticWithPretty.ts (1 errors) ====
     const x: {c: string} = {
         a: {
diff --git a/tests/baselines/reference/prettyContextNotDebugAssertion.errors.txt b/tests/baselines/reference/prettyContextNotDebugAssertion.errors.txt
index 3c94d3bd0b8..57b4f5d62f7 100644
--- a/tests/baselines/reference/prettyContextNotDebugAssertion.errors.txt
+++ b/tests/baselines/reference/prettyContextNotDebugAssertion.errors.txt
@@ -4,7 +4,6 @@
   
 
 
-
 ==== tests/cases/compiler/index.ts (1 errors) ====
     if (true) {
     

From f8d2857e25a1a1276edfe6dd691de68dad36e91f Mon Sep 17 00:00:00 2001
From: Ryan Cavanaugh <the.ryan.cavanaugh@gmail.com>
Date: Sun, 10 Jun 2018 14:56:48 -0700
Subject: [PATCH 22/37] tsserverlibrary

---
 Jakefile.js                       | 35 ++++++++++++++++++++++++-------
 src/tsconfig.json                 |  1 +
 src/tsserverLibrary/empty.ts      |  1 +
 src/tsserverLibrary/tsconfig.json | 18 ++++++++++++++++
 4 files changed, 48 insertions(+), 7 deletions(-)
 create mode 100644 src/tsserverLibrary/empty.ts
 create mode 100644 src/tsserverLibrary/tsconfig.json

diff --git a/Jakefile.js b/Jakefile.js
index b3d62dbdaf5..a5cc7c26668 100644
--- a/Jakefile.js
+++ b/Jakefile.js
@@ -47,9 +47,12 @@ const Paths = {
     builtLocalRun: "built/local/run.js",
     locLcg: "built/local/enu/diagnosticMessages.generated.json.lcg",
     typesMapOutput: "built/local/typesMap.json",
+    
     servicesFile: "built/local/typescriptServices.js",
     servicesDefinitionFile: "built/local/typescriptServices.d.ts",
 
+    tsserverGlobalLibraryFile: "built/local/tsserverGlobalLibrary.js",
+    tsserverGlobalLibraryDefinitionFile: "built/local/tsserverGlobalLibrary.d.ts",
     tsserverLibraryFile: "built/local/tsserverlibrary.js",
     tsserverLibraryDefinitionFile: "built/local/tsserverlibrary.d.ts",
 
@@ -161,7 +164,7 @@ task(TaskNames.lkg, [
     const sizeBefore = getDirSize(Paths.lkg);
     const localizationTargets = locales.map(f => path.join(Paths.builtLocal, f)).concat(path.dirname(Paths.locLcg));
 
-    const copyrightContent = fs.readFileSync(Paths.copyright, { encoding: 'utf-8' });
+    const copyrightContent = readFileSync(Paths.copyright);
 
     const expectedFiles = [...libraryTargets, ...ExpectedLKGFiles, ...localizationTargets];
     const missingFiles = expectedFiles.filter(f => !fs.existsSync(f));
@@ -172,7 +175,7 @@ task(TaskNames.lkg, [
     // Copy all the targets into the LKG directory
     jake.mkdirP(Paths.lkg);
     expectedFiles.forEach(f => {
-        let content = fs.readFileSync(f, { encoding: 'utf-8' });
+        let content = readFileSync(f);
 
         // If this is a .d.ts file, run remove-internal on it
         if (f.endsWith(".d.ts")) {
@@ -282,7 +285,7 @@ file(Paths.diagnosticInformationMap, [Paths.diagnosticMessagesJson], function (c
 }, { async: true });
 
 file(Paths.typesMapOutput, /** @type {*} */(function () {
-    var content = fs.readFileSync(path.join(Paths.srcServer, 'typesMap.json'));
+    var content = readFileSync(path.join(Paths.srcServer, 'typesMap.json'));
     // Validate that it's valid JSON
     try {
         JSON.parse(content.toString());
@@ -293,18 +296,21 @@ file(Paths.typesMapOutput, /** @type {*} */(function () {
 }));
 
 file(Paths.tsserverLibraryFile, [TaskNames.coreBuild, Paths.copyright, ...libraryTargets], function() {
-    // fs.writeFileSync(Paths.tsserverLibraryFile, fs.readFileSync(path.join(Paths.builtLocal, "server.js"), { encoding: 'utf-8'}));
-    fs.writeFileSync(Paths.tsserverLibraryFile, "wat");
+    const originalContent = readFileSync(Paths.tsserverGlobalLibraryFile);
+    const newContent =
+        readFileSync(Paths.copyright) +
+        originalContent;
+    writeFileSync(Paths.tsserverLibraryFile, newContent);
 });
 
 file(Paths.tsserverLibraryDefinitionFile, [TaskNames.coreBuild, Paths.copyright, ...libraryTargets], function () {
-    const content = fs.readFileSync(Paths.servicesFile, { encoding: 'utf-8' });
+    const content = readFileSync(Paths.tsserverGlobalLibraryDefinitionFile);
     const newContent =
         removeConstModifierFromEnumDeclarations(content) +
         `\nexport = ts` +
         `\nexport as namespace ts;`;
 
-    fs.writeFileSync(Paths.tsserverLibraryDefinitionFile, newContent, { encoding: 'utf-8' });
+    writeFileSync(Paths.tsserverLibraryDefinitionFile, newContent);
 });
 
 function getLibraryTargets() {
@@ -657,3 +663,18 @@ function getDiffTool() {
 function removeConstModifierFromEnumDeclarations(text) {
     return text.replace(/^(\s*)(export )?const enum (\S+) {(\s*)$/gm, '$1$2enum $3 {$4');
 }
+
+/**
+ * @param {string} path 
+ */
+function readFileSync(path) {
+    return fs.readFileSync(path, { encoding: "utf-8" });
+}
+
+/**
+ * @param {string} path 
+ * @param {string} contents
+ */
+function writeFileSync(path, contents) {
+    fs.writeFileSync(path, contents, { encoding: "utf-8" });
+}
diff --git a/src/tsconfig.json b/src/tsconfig.json
index 0c7f0c65da0..72f9cecebac 100644
--- a/src/tsconfig.json
+++ b/src/tsconfig.json
@@ -4,6 +4,7 @@
     "references": [
         { "path": "./tsc" },
         { "path": "./tsserver" },
+        { "path": "./tsserverLibrary" },
         { "path": "./typingsInstaller" },
         { "path": "./watchGuard" },
         { "path": "./cancellationToken" },
diff --git a/src/tsserverLibrary/empty.ts b/src/tsserverLibrary/empty.ts
new file mode 100644
index 00000000000..80c90edcdd4
--- /dev/null
+++ b/src/tsserverLibrary/empty.ts
@@ -0,0 +1 @@
+// Workaround file, please delete once tsbuild understands it's not safe to skip this container
diff --git a/src/tsserverLibrary/tsconfig.json b/src/tsserverLibrary/tsconfig.json
new file mode 100644
index 00000000000..459504b5173
--- /dev/null
+++ b/src/tsserverLibrary/tsconfig.json
@@ -0,0 +1,18 @@
+{
+    "extends": "../tsconfig-base",
+ 
+    "compilerOptions": {
+        "outFile": "../../built/local/tsserverGlobalLibrary.js",
+        "types": [
+            "node"
+        ]
+    },
+    "files": ["empty.ts"],
+    "references": [
+        { "path": "../core", "prepend": true },
+        { "path": "../parser", "prepend": true },
+        { "path": "../compiler", "prepend": true },
+        { "path": "../services", "prepend": true },
+        { "path": "../server", "prepend": true }
+    ]
+}

From eb2abf22ff3c13ab708e6079481e584447496cf1 Mon Sep 17 00:00:00 2001
From: Ryan Cavanaugh <the.ryan.cavanaugh@gmail.com>
Date: Sun, 10 Jun 2018 15:09:48 -0700
Subject: [PATCH 23/37] Should not have existed

---
 src/built/local/cancellationToken.js     |    57 -
 src/built/local/cancellationToken.js.map |     1 -
 src/built/local/harness.d.ts             |  2223 ----
 src/built/local/harness.js               | 11641 ---------------------
 src/built/local/harness.js.map           |     1 -
 5 files changed, 13923 deletions(-)
 delete mode 100644 src/built/local/cancellationToken.js
 delete mode 100644 src/built/local/cancellationToken.js.map
 delete mode 100644 src/built/local/harness.d.ts
 delete mode 100644 src/built/local/harness.js
 delete mode 100644 src/built/local/harness.js.map

diff --git a/src/built/local/cancellationToken.js b/src/built/local/cancellationToken.js
deleted file mode 100644
index 5ead504797b..00000000000
--- a/src/built/local/cancellationToken.js
+++ /dev/null
@@ -1,57 +0,0 @@
-"use strict";
-var fs = require("fs");
-function pipeExists(name) {
-    try {
-        fs.statSync(name);
-        return true;
-    }
-    catch (e) {
-        return false;
-    }
-}
-function createCancellationToken(args) {
-    var cancellationPipeName;
-    for (var i = 0; i < args.length - 1; i++) {
-        if (args[i] === "--cancellationPipeName") {
-            cancellationPipeName = args[i + 1];
-            break;
-        }
-    }
-    if (!cancellationPipeName) {
-        return {
-            isCancellationRequested: function () { return false; },
-            setRequest: function (_requestId) { return void 0; },
-            resetRequest: function (_requestId) { return void 0; }
-        };
-    }
-    if (cancellationPipeName.charAt(cancellationPipeName.length - 1) === "*") {
-        var namePrefix_1 = cancellationPipeName.slice(0, -1);
-        if (namePrefix_1.length === 0 || namePrefix_1.indexOf("*") >= 0) {
-            throw new Error("Invalid name for template cancellation pipe: it should have length greater than 2 characters and contain only one '*'.");
-        }
-        var perRequestPipeName_1;
-        var currentRequestId_1;
-        return {
-            isCancellationRequested: function () { return perRequestPipeName_1 !== undefined && pipeExists(perRequestPipeName_1); },
-            setRequest: function (requestId) {
-                currentRequestId_1 = requestId;
-                perRequestPipeName_1 = namePrefix_1 + requestId;
-            },
-            resetRequest: function (requestId) {
-                if (currentRequestId_1 !== requestId) {
-                    throw new Error("Mismatched request id, expected " + currentRequestId_1 + ", actual " + requestId);
-                }
-                perRequestPipeName_1 = undefined;
-            }
-        };
-    }
-    else {
-        return {
-            isCancellationRequested: function () { return pipeExists(cancellationPipeName); },
-            setRequest: function (_requestId) { return void 0; },
-            resetRequest: function (_requestId) { return void 0; }
-        };
-    }
-}
-module.exports = createCancellationToken;
-//# sourceMappingURL=cancellationToken.js.map
\ No newline at end of file
diff --git a/src/built/local/cancellationToken.js.map b/src/built/local/cancellationToken.js.map
deleted file mode 100644
index d8f1300682a..00000000000
--- a/src/built/local/cancellationToken.js.map
+++ /dev/null
@@ -1 +0,0 @@
-{"version":3,"file":"cancellationToken.js","sourceRoot":"","sources":["../../cancellationToken/cancellationToken.ts"],"names":[],"mappings":";AAEA,uBAA0B;AAQ1B,oBAAoB,IAAY;IAC5B,IAAI;QACA,EAAE,CAAC,QAAQ,CAAC,IAAI,CAAC,CAAC;QAClB,OAAO,IAAI,CAAC;KACf;IACD,OAAO,CAAC,EAAE;QACN,OAAO,KAAK,CAAC;KAChB;AACL,CAAC;AAED,iCAAiC,IAAc;IAC3C,IAAI,oBAAwC,CAAC;IAC7C,KAAK,IAAI,CAAC,GAAG,CAAC,EAAE,CAAC,GAAG,IAAI,CAAC,MAAM,GAAG,CAAC,EAAE,CAAC,EAAE,EAAE;QACtC,IAAI,IAAI,CAAC,CAAC,CAAC,KAAK,wBAAwB,EAAE;YACtC,oBAAoB,GAAG,IAAI,CAAC,CAAC,GAAG,CAAC,CAAC,CAAC;YACnC,MAAM;SACT;KACJ;IACD,IAAI,CAAC,oBAAoB,EAAE;QACvB,OAAO;YACH,uBAAuB,EAAE,cAAM,OAAA,KAAK,EAAL,CAAK;YACpC,UAAU,EAAE,UAAC,UAAkB,IAAW,OAAA,KAAK,CAAC,EAAN,CAAM;YAChD,YAAY,EAAE,UAAC,UAAkB,IAAW,OAAA,KAAK,CAAC,EAAN,CAAM;SACrD,CAAC;KACL;IAMD,IAAI,oBAAoB,CAAC,MAAM,CAAC,oBAAoB,CAAC,MAAM,GAAG,CAAC,CAAC,KAAK,GAAG,EAAE;QACtE,IAAM,YAAU,GAAG,oBAAoB,CAAC,KAAK,CAAC,CAAC,EAAE,CAAC,CAAC,CAAC,CAAC;QACrD,IAAI,YAAU,CAAC,MAAM,KAAK,CAAC,IAAI,YAAU,CAAC,OAAO,CAAC,GAAG,CAAC,IAAI,CAAC,EAAE;YACzD,MAAM,IAAI,KAAK,CAAC,wHAAwH,CAAC,CAAC;SAC7I;QACD,IAAI,oBAAsC,CAAC;QAC3C,IAAI,kBAAwB,CAAC;QAC7B,OAAO;YACH,uBAAuB,EAAE,cAAM,OAAA,oBAAkB,KAAK,SAAS,IAAI,UAAU,CAAC,oBAAkB,CAAC,EAAlE,CAAkE;YACjG,UAAU,YAAC,SAAiB;gBACxB,kBAAgB,GAAG,SAAS,CAAC;gBAC7B,oBAAkB,GAAG,YAAU,GAAG,SAAS,CAAC;YAChD,CAAC;YACD,YAAY,YAAC,SAAiB;gBAC1B,IAAI,kBAAgB,KAAK,SAAS,EAAE;oBAChC,MAAM,IAAI,KAAK,CAAC,qCAAmC,kBAAgB,iBAAY,SAAW,CAAC,CAAC;iBAC/F;gBACD,oBAAkB,GAAG,SAAS,CAAC;YACnC,CAAC;SACJ,CAAC;KACL;SACI;QACD,OAAO;YACH,uBAAuB,EAAE,cAAM,OAAA,UAAU,CAAC,oBAAqB,CAAC,EAAjC,CAAiC;YAChE,UAAU,EAAE,UAAC,UAAkB,IAAW,OAAA,KAAK,CAAC,EAAN,CAAM;YAChD,YAAY,EAAE,UAAC,UAAkB,IAAW,OAAA,KAAK,CAAC,EAAN,CAAM;SACrD,CAAC;KACL;AACL,CAAC;AACD,iBAAS,uBAAuB,CAAC"}
\ No newline at end of file
diff --git a/src/built/local/harness.d.ts b/src/built/local/harness.d.ts
deleted file mode 100644
index 04c03214347..00000000000
--- a/src/built/local/harness.d.ts
+++ /dev/null
@@ -1,2223 +0,0 @@
-/// <reference types="node" />
-/// <reference types="chai" />
-declare namespace collections {
-    interface SortOptions<T> {
-        comparer: (a: T, b: T) => number;
-        sort: "insertion" | "comparison";
-    }
-    class SortedMap<K, V> {
-        private _comparer;
-        private _keys;
-        private _values;
-        private _order;
-        private _version;
-        private _copyOnWrite;
-        constructor(comparer: ((a: K, b: K) => number) | SortOptions<K>, iterable?: Iterable<[K, V]>);
-        readonly size: number;
-        readonly comparer: (a: K, b: K) => number;
-        readonly [Symbol.toStringTag]: string;
-        has(key: K): boolean;
-        get(key: K): V | undefined;
-        set(key: K, value: V): this;
-        delete(key: K): boolean;
-        clear(): void;
-        forEach(callback: (value: V, key: K, collection: this) => void, thisArg?: any): void;
-        keys(): IterableIterator<K>;
-        values(): IterableIterator<V>;
-        entries(): IterableIterator<[K, V]>;
-        [Symbol.iterator](): IterableIterator<[K, V]>;
-        private writePreamble;
-        private writePostScript;
-        private getIterationOrder;
-    }
-    function insertAt<T>(array: T[], index: number, value: T): void;
-    function getIterator<T>(iterable: Iterable<T>): Iterator<T>;
-    function nextResult<T>(iterator: Iterator<T>): IteratorResult<T> | undefined;
-    function closeIterator<T>(iterator: Iterator<T>): void;
-    /**
-     * A collection of metadata that supports inheritance.
-     */
-    class Metadata {
-        private static readonly _undefinedValue;
-        private _parent;
-        private _map;
-        private _version;
-        private _size;
-        private _parentVersion;
-        constructor(parent?: Metadata);
-        readonly size: number;
-        readonly parent: Metadata | undefined;
-        has(key: string): boolean;
-        get(key: string): any;
-        set(key: string, value: any): this;
-        delete(key: string): boolean;
-        clear(): void;
-        forEach(callback: (value: any, key: string, map: this) => void): void;
-        private static _escapeKey;
-        private static _unescapeKey;
-    }
-}
-/**
- * Common utilities
- */
-declare namespace utils {
-    function removeTestPathPrefixes(text: string, retainTrailingDirectorySeparator?: boolean): string;
-    /**
-     * Removes leading indentation from a template literal string.
-     */
-    function dedent(array: TemplateStringsArray, ...args: any[]): string;
-    function toUtf8(text: string): string;
-    function getByteOrderMarkLength(text: string): number;
-    function removeByteOrderMark(text: string): string;
-    function addUTF8ByteOrderMark(text: string): string;
-}
-declare namespace documents {
-    class TextDocument {
-        readonly meta: Map<string, string>;
-        readonly file: string;
-        readonly text: string;
-        private _lineStarts;
-        private _testFile;
-        constructor(file: string, text: string, meta?: Map<string, string>);
-        readonly lineStarts: ReadonlyArray<number>;
-        static fromTestFile(file: Harness.Compiler.TestFile): TextDocument;
-        asTestFile(): Harness.Compiler.TestFile;
-    }
-    interface RawSourceMap {
-        version: number;
-        file: string;
-        sourceRoot?: string;
-        sources: string[];
-        sourcesContent?: string[];
-        names: string[];
-        mappings: string;
-    }
-    interface Mapping {
-        mappingIndex: number;
-        emittedLine: number;
-        emittedColumn: number;
-        sourceIndex: number;
-        sourceLine: number;
-        sourceColumn: number;
-        nameIndex?: number;
-    }
-    class SourceMap {
-        readonly raw: RawSourceMap;
-        readonly mapFile: string | undefined;
-        readonly version: number;
-        readonly file: string;
-        readonly sourceRoot: string | undefined;
-        readonly sources: ReadonlyArray<string>;
-        readonly sourcesContent: ReadonlyArray<string> | undefined;
-        readonly mappings: ReadonlyArray<Mapping>;
-        readonly names: ReadonlyArray<string> | undefined;
-        private static readonly _mappingRegExp;
-        private static readonly _sourceMappingURLRegExp;
-        private static readonly _dataURLRegExp;
-        private static readonly _base64Chars;
-        private _emittedLineMappings;
-        private _sourceLineMappings;
-        constructor(mapFile: string | undefined, data: string | RawSourceMap);
-        static getUrl(text: string): string | undefined;
-        static fromUrl(url: string): SourceMap | undefined;
-        static fromSource(text: string): SourceMap | undefined;
-        getMappingsForEmittedLine(emittedLine: number): ReadonlyArray<Mapping> | undefined;
-        getMappingsForSourceLine(sourceIndex: number, sourceLine: number): ReadonlyArray<Mapping> | undefined;
-        private static _decodeVLQ;
-    }
-}
-declare namespace vpath {
-    export import sep = ts.directorySeparator;
-    export import normalizeSeparators = ts.normalizeSlashes;
-    export import isAbsolute = ts.isRootedDiskPath;
-    export import isRoot = ts.isDiskPathRoot;
-    export import hasTrailingSeparator = ts.hasTrailingDirectorySeparator;
-    export import addTrailingSeparator = ts.ensureTrailingDirectorySeparator;
-    export import removeTrailingSeparator = ts.removeTrailingDirectorySeparator;
-    export import normalize = ts.normalizePath;
-    export import combine = ts.combinePaths;
-    export import parse = ts.getPathComponents;
-    export import reduce = ts.reducePathComponents;
-    export import format = ts.getPathFromPathComponents;
-    export import resolve = ts.resolvePath;
-    export import compare = ts.comparePaths;
-    export import compareCaseSensitive = ts.comparePathsCaseSensitive;
-    export import compareCaseInsensitive = ts.comparePathsCaseInsensitive;
-    export import dirname = ts.getDirectoryPath;
-    export import basename = ts.getBaseFileName;
-    export import extname = ts.getAnyExtensionFromPath;
-    export import relative = ts.getRelativePathFromDirectory;
-    export import beneath = ts.containsPath;
-    export import changeExtension = ts.changeAnyExtension;
-    export import isTypeScript = ts.hasTypeScriptFileExtension;
-    export import isJavaScript = ts.hasJavaScriptFileExtension;
-    const enum ValidationFlags {
-        None = 0,
-        RequireRoot = 1,
-        RequireDirname = 2,
-        RequireBasename = 4,
-        RequireExtname = 8,
-        RequireTrailingSeparator = 16,
-        AllowRoot = 32,
-        AllowDirname = 64,
-        AllowBasename = 128,
-        AllowExtname = 256,
-        AllowTrailingSeparator = 512,
-        AllowNavigation = 1024,
-        AllowWildcard = 2048,
-        /** Path must be a valid directory root */
-        Root = 545,
-        /** Path must be a absolute */
-        Absolute = 2017,
-        /** Path may be relative or absolute */
-        RelativeOrAbsolute = 2016,
-        /** Path may only be a filename */
-        Basename = 260
-    }
-    function validate(path: string, flags?: ValidationFlags): string;
-    function isDeclaration(path: string): boolean;
-    function isSourceMap(path: string): boolean;
-    function isJavaScriptSourceMap(path: string): boolean;
-    function isJson(path: string): boolean;
-    function isDefaultLibrary(path: string): boolean;
-    function isTsConfigFile(path: string): boolean;
-}
-declare namespace vfs {
-    /**
-     * Posix-style path to the TypeScript compiler build outputs (including tsc.js, lib.d.ts, etc.)
-     */
-    const builtFolder = "/.ts";
-    /**
-     * Posix-style path to additional mountable folders (./tests/projects in this repo)
-     */
-    const projectsFolder = "/.projects";
-    /**
-     * Posix-style path to additional test libraries
-     */
-    const testLibFolder = "/.lib";
-    /**
-     * Posix-style path to sources under test
-     */
-    const srcFolder = "/.src";
-    /**
-     * Represents a virtual POSIX-like file system.
-     */
-    class FileSystem {
-        /** Indicates whether the file system is case-sensitive (`false`) or case-insensitive (`true`). */
-        readonly ignoreCase: boolean;
-        /** Gets the comparison function used to compare two paths. */
-        readonly stringComparer: (a: string, b: string) => number;
-        private _lazy;
-        private _cwd;
-        private _time;
-        private _shadowRoot;
-        private _dirStack;
-        constructor(ignoreCase: boolean, options?: FileSystemOptions);
-        /**
-         * Gets metadata for this `FileSystem`.
-         */
-        readonly meta: collections.Metadata;
-        /**
-         * Gets a value indicating whether the file system is read-only.
-         */
-        readonly isReadonly: boolean;
-        /**
-         * Makes the file system read-only.
-         */
-        makeReadonly(): this;
-        /**
-         * Gets the file system shadowed by this file system.
-         */
-        readonly shadowRoot: FileSystem | undefined;
-        /**
-         * Gets a shadow copy of this file system. Changes to the shadow copy do not affect the
-         * original, allowing multiple copies of the same core file system without multiple copies
-         * of the same data.
-         */
-        shadow(ignoreCase?: boolean): FileSystem;
-        /**
-         * Gets or sets the timestamp (in milliseconds) used for file status, returning the previous timestamp.
-         *
-         * @link http://pubs.opengroup.org/onlinepubs/9699919799/functions/time.html
-         */
-        time(value?: number | Date | (() => number | Date)): number;
-        /**
-         * Gets the metadata object for a path.
-         * @param path
-         */
-        filemeta(path: string): collections.Metadata;
-        private _filemeta;
-        /**
-         * Get the pathname of the current working directory.
-         *
-         * @link - http://pubs.opengroup.org/onlinepubs/9699919799/functions/getcwd.html
-         */
-        cwd(): string;
-        /**
-         * Changes the current working directory.
-         *
-         * @link http://pubs.opengroup.org/onlinepubs/9699919799/functions/chdir.html
-         */
-        chdir(path: string): void;
-        /**
-         * Pushes the current directory onto the directory stack and changes the current working directory to the supplied path.
-         */
-        pushd(path?: string): void;
-        /**
-         * Pops the previous directory from the location stack and changes the current directory to that directory.
-         */
-        popd(): void;
-        /**
-         * Update the file system with a set of files.
-         */
-        apply(files: FileSet): void;
-        /**
-         * Scan file system entries along a path. If `path` is a symbolic link, it is dereferenced.
-         * @param path The path at which to start the scan.
-         * @param axis The axis along which to traverse.
-         * @param traversal The traversal scheme to use.
-         */
-        scanSync(path: string, axis: Axis, traversal: Traversal): string[];
-        /**
-         * Scan file system entries along a path.
-         * @param path The path at which to start the scan.
-         * @param axis The axis along which to traverse.
-         * @param traversal The traversal scheme to use.
-         */
-        lscanSync(path: string, axis: Axis, traversal: Traversal): string[];
-        private _scan;
-        /**
-         * Mounts a physical or virtual file system at a location in this virtual file system.
-         *
-         * @param source The path in the physical (or other virtual) file system.
-         * @param target The path in this virtual file system.
-         * @param resolver An object used to resolve files in `source`.
-         */
-        mountSync(source: string, target: string, resolver: FileSystemResolver): void;
-        /**
-         * Recursively remove all files and directories underneath the provided path.
-         */
-        rimrafSync(path: string): void;
-        /**
-         * Make a directory and all of its parent paths (if they don't exist).
-         */
-        mkdirpSync(path: string): void;
-        getFileListing(): string;
-        /**
-         * Print diagnostic information about the structure of the file system to the console.
-         */
-        debugPrint(): void;
-        /**
-         * Determines whether a path exists.
-         */
-        existsSync(path: string): boolean;
-        /**
-         * Get file status. If `path` is a symbolic link, it is dereferenced.
-         *
-         * @link http://pubs.opengroup.org/onlinepubs/9699919799/functions/stat.html
-         *
-         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
-         */
-        statSync(path: string): Stats;
-        /**
-         * Change file access times
-         *
-         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
-         */
-        utimesSync(path: string, atime: Date, mtime: Date): void;
-        /**
-         * Get file status. If `path` is a symbolic link, it is dereferenced.
-         *
-         * @link http://pubs.opengroup.org/onlinepubs/9699919799/functions/lstat.html
-         *
-         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
-         */
-        lstatSync(path: string): Stats;
-        private _stat;
-        /**
-         * Read a directory. If `path` is a symbolic link, it is dereferenced.
-         *
-         * @link http://pubs.opengroup.org/onlinepubs/9699919799/functions/readdir.html
-         *
-         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
-         */
-        readdirSync(path: string): string[];
-        /**
-         * Make a directory.
-         *
-         * @link http://pubs.opengroup.org/onlinepubs/9699919799/functions/mkdir.html
-         *
-         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
-         */
-        mkdirSync(path: string): void;
-        private _mkdir;
-        /**
-         * Remove a directory.
-         *
-         * @link http://pubs.opengroup.org/onlinepubs/9699919799/functions/rmdir.html
-         *
-         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
-         */
-        rmdirSync(path: string): void;
-        /**
-         * Link one file to another file (also known as a "hard link").
-         *
-         * @link http://pubs.opengroup.org/onlinepubs/9699919799/functions/link.html
-         *
-         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
-         */
-        linkSync(oldpath: string, newpath: string): void;
-        /**
-         * Remove a directory entry.
-         *
-         * @link http://pubs.opengroup.org/onlinepubs/9699919799/functions/unlink.html
-         *
-         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
-         */
-        unlinkSync(path: string): void;
-        /**
-         * Rename a file.
-         *
-         * @link http://pubs.opengroup.org/onlinepubs/9699919799/functions/rename.html
-         *
-         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
-         */
-        renameSync(oldpath: string, newpath: string): void;
-        /**
-         * Make a symbolic link.
-         *
-         * @link http://pubs.opengroup.org/onlinepubs/9699919799/functions/symlink.html
-         *
-         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
-         */
-        symlinkSync(target: string, linkpath: string): void;
-        /**
-         * Resolve a pathname.
-         *
-         * @link http://pubs.opengroup.org/onlinepubs/9699919799/functions/realpath.html
-         *
-         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
-         */
-        realpathSync(path: string): string;
-        /**
-         * Read from a file.
-         *
-         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
-         */
-        readFileSync(path: string, encoding?: null): Buffer;
-        /**
-         * Read from a file.
-         *
-         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
-         */
-        readFileSync(path: string, encoding: string): string;
-        /**
-         * Read from a file.
-         *
-         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
-         */
-        readFileSync(path: string, encoding?: string | null): string | Buffer;
-        /**
-         * Write to a file.
-         *
-         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
-         */
-        writeFileSync(path: string, data: string | Buffer, encoding?: string | null): void;
-        private _mknod;
-        private _addLink;
-        private _removeLink;
-        private _replaceLink;
-        private _getRootLinks;
-        private _getLinks;
-        private _getShadow;
-        private _copyShadowLinks;
-        private _getSize;
-        private _getBuffer;
-        /**
-         * Walk a path to its end.
-         *
-         * @param path The path to follow.
-         * @param noFollow A value indicating whether to *not* dereference a symbolic link at the
-         * end of a path.
-         *
-         * @link http://man7.org/linux/man-pages/man7/path_resolution.7.html
-         */
-        private _walk;
-        /**
-         * Resolve a path relative to the current working directory.
-         */
-        private _resolve;
-        private _applyFiles;
-        private _applyFileExtendedOptions;
-        private _applyFilesWorker;
-        private _normalizeFileSetEntry;
-    }
-    interface FileSystemOptions {
-        time?: number | Date | (() => number | Date);
-        files?: FileSet;
-        cwd?: string;
-        meta?: Record<string, any>;
-    }
-    interface FileSystemCreateOptions {
-        documents?: ReadonlyArray<documents.TextDocument>;
-        cwd?: string;
-    }
-    type Axis = "ancestors" | "ancestors-or-self" | "self" | "descendants-or-self" | "descendants";
-    interface Traversal {
-        /** A function called to choose whether to continue to traverse to either ancestors or descendants. */
-        traverse?(path: string, stats: Stats): boolean;
-        /** A function called to choose whether to accept a path as part of the result. */
-        accept?(path: string, stats: Stats): boolean;
-    }
-    interface FileSystemResolver {
-        statSync(path: string): {
-            mode: number;
-            size: number;
-        };
-        readdirSync(path: string): string[];
-        readFileSync(path: string): Buffer;
-    }
-    interface FileSystemResolverHost {
-        useCaseSensitiveFileNames(): boolean;
-        getAccessibleFileSystemEntries(path: string): ts.FileSystemEntries;
-        directoryExists(path: string): boolean;
-        fileExists(path: string): boolean;
-        getFileSize(path: string): number;
-        readFile(path: string): string | undefined;
-        getWorkspaceRoot(): string;
-    }
-    function createResolver(host: FileSystemResolverHost): FileSystemResolver;
-    /**
-     * Create a virtual file system from a physical file system using the following path mappings:
-     *
-     *  - `/.ts` is a directory mapped to `${workspaceRoot}/built/local`
-     *  - `/.lib` is a directory mapped to `${workspaceRoot}/tests/lib`
-     *  - `/.src` is a virtual directory to be used for tests.
-     *
-     * Unless overridden, `/.src` will be the current working directory for the virtual file system.
-     */
-    function createFromFileSystem(host: FileSystemResolverHost, ignoreCase: boolean, { documents, cwd }?: FileSystemCreateOptions): FileSystem;
-    class Stats {
-        dev: number;
-        ino: number;
-        mode: number;
-        nlink: number;
-        uid: number;
-        gid: number;
-        rdev: number;
-        size: number;
-        blksize: number;
-        blocks: number;
-        atimeMs: number;
-        mtimeMs: number;
-        ctimeMs: number;
-        birthtimeMs: number;
-        atime: Date;
-        mtime: Date;
-        ctime: Date;
-        birthtime: Date;
-        constructor();
-        constructor(dev: number, ino: number, mode: number, nlink: number, rdev: number, size: number, blksize: number, blocks: number, atimeMs: number, mtimeMs: number, ctimeMs: number, birthtimeMs: number);
-        isFile(): boolean;
-        isDirectory(): boolean;
-        isSymbolicLink(): boolean;
-        isBlockDevice(): boolean;
-        isCharacterDevice(): boolean;
-        isFIFO(): boolean;
-        isSocket(): boolean;
-    }
-    const IOErrorMessages: Readonly<{
-        EACCES: string;
-        EIO: string;
-        ENOENT: string;
-        EEXIST: string;
-        ELOOP: string;
-        ENOTDIR: string;
-        EISDIR: string;
-        EBADF: string;
-        EINVAL: string;
-        ENOTEMPTY: string;
-        EPERM: string;
-        EROFS: string;
-    }>;
-    function createIOError(code: keyof typeof IOErrorMessages, details?: string): NodeJS.ErrnoException;
-    /**
-     * A template used to populate files, directories, links, etc. in a virtual file system.
-     */
-    interface FileSet {
-        [name: string]: DirectoryLike | FileLike | Link | Symlink | Mount | null | undefined;
-    }
-    type DirectoryLike = FileSet | Directory;
-    type FileLike = File | Buffer | string;
-    /** Extended options for a directory in a `FileSet` */
-    class Directory {
-        readonly files: FileSet;
-        readonly meta: Record<string, any> | undefined;
-        constructor(files: FileSet, { meta }?: {
-            meta?: Record<string, any>;
-        });
-    }
-    /** Extended options for a file in a `FileSet` */
-    class File {
-        readonly data: Buffer | string;
-        readonly encoding: string | undefined;
-        readonly meta: Record<string, any> | undefined;
-        constructor(data: Buffer | string, { meta, encoding }?: {
-            encoding?: string;
-            meta?: Record<string, any>;
-        });
-    }
-    /** Extended options for a hard link in a `FileSet` */
-    class Link {
-        readonly path: string;
-        constructor(path: string);
-    }
-    /** Extended options for a symbolic link in a `FileSet` */
-    class Symlink {
-        readonly symlink: string;
-        readonly meta: Record<string, any> | undefined;
-        constructor(symlink: string, { meta }?: {
-            meta?: Record<string, any>;
-        });
-    }
-    /** Extended options for mounting a virtual copy of an external file system via a `FileSet` */
-    class Mount {
-        readonly source: string;
-        readonly resolver: FileSystemResolver;
-        readonly meta: Record<string, any> | undefined;
-        constructor(source: string, resolver: FileSystemResolver, { meta }?: {
-            meta?: Record<string, any>;
-        });
-    }
-}
-/**
- * Test harness compiler functionality.
- */
-declare namespace compiler {
-    interface Project {
-        file: string;
-        config?: ts.ParsedCommandLine;
-        errors?: ts.Diagnostic[];
-    }
-    function readProject(host: fakes.ParseConfigHost, project: string | undefined, existingOptions?: ts.CompilerOptions): Project | undefined;
-    /**
-     * Correlates compilation inputs and outputs
-     */
-    interface CompilationOutput {
-        readonly inputs: ReadonlyArray<documents.TextDocument>;
-        readonly js: documents.TextDocument | undefined;
-        readonly dts: documents.TextDocument | undefined;
-        readonly map: documents.TextDocument | undefined;
-    }
-    class CompilationResult {
-        readonly host: fakes.CompilerHost;
-        readonly program: ts.Program | undefined;
-        readonly result: ts.EmitResult | undefined;
-        readonly options: ts.CompilerOptions;
-        readonly diagnostics: ReadonlyArray<ts.Diagnostic>;
-        readonly js: ReadonlyMap<string, documents.TextDocument>;
-        readonly dts: ReadonlyMap<string, documents.TextDocument>;
-        readonly maps: ReadonlyMap<string, documents.TextDocument>;
-        private _inputs;
-        private _inputsAndOutputs;
-        constructor(host: fakes.CompilerHost, options: ts.CompilerOptions, program: ts.Program | undefined, result: ts.EmitResult | undefined, diagnostics: ts.Diagnostic[]);
-        readonly vfs: vfs.FileSystem;
-        readonly inputs: ReadonlyArray<documents.TextDocument>;
-        readonly outputs: ReadonlyArray<documents.TextDocument>;
-        readonly traces: ReadonlyArray<string>;
-        readonly emitSkipped: boolean;
-        readonly singleFile: boolean;
-        readonly commonSourceDirectory: string;
-        getInputsAndOutputs(path: string): CompilationOutput | undefined;
-        getInputs(path: string): ReadonlyArray<documents.TextDocument> | undefined;
-        getOutput(path: string, kind: "js" | "dts" | "map"): documents.TextDocument | undefined;
-        getSourceMapRecord(): string | undefined;
-        getSourceMap(path: string): documents.SourceMap | undefined;
-        getOutputPath(path: string, ext: string): string;
-        getNumberOfJsFiles(): number;
-    }
-    function compileFiles(host: fakes.CompilerHost, rootFiles: string[] | undefined, compilerOptions: ts.CompilerOptions): CompilationResult;
-}
-declare namespace evaluator {
-    function evaluateTypeScript(sourceText: string, options?: ts.CompilerOptions, globals?: Record<string, any>): any;
-}
-/**
- * Fake implementations of various compiler dependencies.
- */
-declare namespace fakes {
-    interface SystemOptions {
-        executingFilePath?: string;
-        newLine?: "\r\n" | "\n";
-        env?: Record<string, string>;
-    }
-    /**
-     * A fake `ts.System` that leverages a virtual file system.
-     */
-    class System implements ts.System {
-        readonly vfs: vfs.FileSystem;
-        readonly args: string[];
-        readonly output: string[];
-        readonly newLine: string;
-        readonly useCaseSensitiveFileNames: boolean;
-        exitCode: number | undefined;
-        private readonly _executingFilePath;
-        private readonly _env;
-        constructor(vfs: vfs.FileSystem, { executingFilePath, newLine, env }?: SystemOptions);
-        write(message: string): void;
-        readFile(path: string): string | undefined;
-        writeFile(path: string, data: string, writeByteOrderMark?: boolean): void;
-        deleteFile(path: string): void;
-        fileExists(path: string): boolean;
-        directoryExists(path: string): boolean;
-        createDirectory(path: string): void;
-        getCurrentDirectory(): string;
-        getDirectories(path: string): string[];
-        readDirectory(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
-        getAccessibleFileSystemEntries(path: string): ts.FileSystemEntries;
-        exit(exitCode?: number): void;
-        getFileSize(path: string): number;
-        resolvePath(path: string): string;
-        getExecutingFilePath(): string;
-        getModifiedTime(path: string): Date;
-        setModifiedTime(path: string, time: Date): void;
-        createHash(data: string): string;
-        realpath(path: string): string;
-        getEnvironmentVariable(name: string): string;
-        private _getStats;
-    }
-    /**
-     * A fake `ts.ParseConfigHost` that leverages a virtual file system.
-     */
-    class ParseConfigHost implements ts.ParseConfigHost {
-        readonly sys: System;
-        constructor(sys: System | vfs.FileSystem);
-        readonly vfs: vfs.FileSystem;
-        readonly useCaseSensitiveFileNames: boolean;
-        fileExists(fileName: string): boolean;
-        directoryExists(directoryName: string): boolean;
-        readFile(path: string): string | undefined;
-        readDirectory(path: string, extensions: string[], excludes: string[], includes: string[], depth: number): string[];
-    }
-    /**
-     * A fake `ts.CompilerHost` that leverages a virtual file system.
-     */
-    class CompilerHost implements ts.CompilerHost {
-        readonly sys: System;
-        readonly defaultLibLocation: string;
-        readonly outputs: documents.TextDocument[];
-        private readonly _outputsMap;
-        readonly traces: string[];
-        readonly shouldAssertInvariants: boolean;
-        private _setParentNodes;
-        private _sourceFiles;
-        private _parseConfigHost;
-        private _newLine;
-        constructor(sys: System | vfs.FileSystem, options?: ts.CompilerOptions, setParentNodes?: boolean);
-        readonly vfs: vfs.FileSystem;
-        readonly parseConfigHost: ParseConfigHost;
-        getCurrentDirectory(): string;
-        useCaseSensitiveFileNames(): boolean;
-        getNewLine(): string;
-        getCanonicalFileName(fileName: string): string;
-        deleteFile(fileName: string): void;
-        fileExists(fileName: string): boolean;
-        directoryExists(directoryName: string): boolean;
-        getModifiedTime(fileName: string): Date;
-        setModifiedTime(fileName: string, time: Date): void;
-        getDirectories(path: string): string[];
-        readDirectory(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
-        readFile(path: string): string | undefined;
-        writeFile(fileName: string, content: string, writeByteOrderMark: boolean): void;
-        trace(s: string): void;
-        realpath(path: string): string;
-        getDefaultLibLocation(): string;
-        getDefaultLibFileName(options: ts.CompilerOptions): string;
-        getSourceFile(fileName: string, languageVersion: number): ts.SourceFile | undefined;
-    }
-}
-declare namespace ts.server {
-    interface SessionClientHost extends LanguageServiceHost {
-        writeMessage(message: string): void;
-    }
-    function extractMessage(message: string): string;
-    class SessionClient implements LanguageService {
-        private host;
-        private sequence;
-        private lineMaps;
-        private messages;
-        private lastRenameEntry;
-        constructor(host: SessionClientHost);
-        onMessage(message: string): void;
-        private writeMessage;
-        private getLineMap;
-        private lineOffsetToPosition;
-        private positionToOneBasedLineOffset;
-        private convertCodeEditsToTextChange;
-        private processRequest;
-        private processResponse;
-        openFile(file: string, fileContent?: string, scriptKindName?: "TS" | "JS" | "TSX" | "JSX"): void;
-        closeFile(file: string): void;
-        changeFile(fileName: string, start: number, end: number, insertString: string): void;
-        toLineColumnOffset(fileName: string, position: number): {
-            line: number;
-            character: number;
-        };
-        getQuickInfoAtPosition(fileName: string, position: number): QuickInfo;
-        getProjectInfo(file: string, needFileNameList: boolean): protocol.ProjectInfo;
-        getCompletionsAtPosition(fileName: string, position: number, _preferences: UserPreferences | undefined): CompletionInfo;
-        getCompletionEntryDetails(fileName: string, position: number, entryName: string, _options: FormatCodeOptions | FormatCodeSettings | undefined, source: string | undefined): CompletionEntryDetails;
-        getCompletionEntrySymbol(_fileName: string, _position: number, _entryName: string): Symbol;
-        getNavigateToItems(searchValue: string): NavigateToItem[];
-        getFormattingEditsForRange(file: string, start: number, end: number, _options: FormatCodeOptions): TextChange[];
-        getFormattingEditsForDocument(fileName: string, options: FormatCodeOptions): TextChange[];
-        getFormattingEditsAfterKeystroke(fileName: string, position: number, key: string, _options: FormatCodeOptions): TextChange[];
-        getDefinitionAtPosition(fileName: string, position: number): DefinitionInfo[];
-        getDefinitionAndBoundSpan(fileName: string, position: number): DefinitionInfoAndBoundSpan;
-        getTypeDefinitionAtPosition(fileName: string, position: number): DefinitionInfo[];
-        getImplementationAtPosition(fileName: string, position: number): ImplementationLocation[];
-        findReferences(_fileName: string, _position: number): ReferencedSymbol[];
-        getReferencesAtPosition(fileName: string, position: number): ReferenceEntry[];
-        getEmitOutput(_fileName: string): EmitOutput;
-        getSyntacticDiagnostics(file: string): DiagnosticWithLocation[];
-        getSemanticDiagnostics(file: string): Diagnostic[];
-        getSuggestionDiagnostics(file: string): DiagnosticWithLocation[];
-        private getDiagnostics;
-        getCompilerOptionsDiagnostics(): Diagnostic[];
-        getRenameInfo(fileName: string, position: number, findInStrings?: boolean, findInComments?: boolean): RenameInfo;
-        findRenameLocations(fileName: string, position: number, findInStrings: boolean, findInComments: boolean): RenameLocation[];
-        private decodeNavigationBarItems;
-        getNavigationBarItems(file: string): NavigationBarItem[];
-        private decodeNavigationTree;
-        getNavigationTree(file: string): NavigationTree;
-        private decodeSpan;
-        getNameOrDottedNameSpan(_fileName: string, _startPos: number, _endPos: number): TextSpan;
-        getBreakpointStatementAtPosition(_fileName: string, _position: number): TextSpan;
-        getSignatureHelpItems(fileName: string, position: number): SignatureHelpItems;
-        getOccurrencesAtPosition(fileName: string, position: number): ReferenceEntry[];
-        getDocumentHighlights(fileName: string, position: number, filesToSearch: string[]): DocumentHighlights[];
-        getOutliningSpans(file: string): OutliningSpan[];
-        getTodoComments(_fileName: string, _descriptors: TodoCommentDescriptor[]): TodoComment[];
-        getDocCommentTemplateAtPosition(_fileName: string, _position: number): TextInsertion;
-        isValidBraceCompletionAtPosition(_fileName: string, _position: number, _openingBrace: number): boolean;
-        getJsxClosingTagAtPosition(_fileName: string, _position: number): never;
-        getSpanOfEnclosingComment(_fileName: string, _position: number, _onlyMultiLine: boolean): TextSpan;
-        getCodeFixesAtPosition(file: string, start: number, end: number, errorCodes: ReadonlyArray<number>): ReadonlyArray<CodeFixAction>;
-        getCombinedCodeFix: typeof notImplemented;
-        applyCodeActionCommand: typeof notImplemented;
-        private createFileLocationOrRangeRequestArgs;
-        private createFileLocationRequestArgs;
-        private createFileRangeRequestArgs;
-        private createFileLocationRequestArgsWithEndLineAndOffset;
-        getApplicableRefactors(fileName: string, positionOrRange: number | TextRange): ApplicableRefactorInfo[];
-        getEditsForRefactor(fileName: string, _formatOptions: FormatCodeSettings, positionOrRange: number | TextRange, refactorName: string, actionName: string): RefactorEditInfo;
-        organizeImports(_scope: OrganizeImportsScope, _formatOptions: FormatCodeSettings): ReadonlyArray<FileTextChanges>;
-        getEditsForFileRename(): never;
-        private convertCodeEditsToTextChanges;
-        private convertChanges;
-        convertTextChangeToCodeEdit(change: protocol.CodeEdit, fileName: string): TextChange;
-        getBraceMatchingAtPosition(fileName: string, position: number): TextSpan[];
-        getIndentationAtPosition(_fileName: string, _position: number, _options: EditorOptions): number;
-        getSyntacticClassifications(_fileName: string, _span: TextSpan): ClassifiedSpan[];
-        getSemanticClassifications(_fileName: string, _span: TextSpan): ClassifiedSpan[];
-        getEncodedSyntacticClassifications(_fileName: string, _span: TextSpan): Classifications;
-        getEncodedSemanticClassifications(_fileName: string, _span: TextSpan): Classifications;
-        getProgram(): Program;
-        getNonBoundSourceFile(_fileName: string): SourceFile;
-        getSourceFile(_fileName: string): SourceFile;
-        cleanupSemanticCache(): void;
-        dispose(): void;
-    }
-}
-declare type TestRunnerKind = CompilerTestKind | FourslashTestKind | "project" | "rwc" | "test262" | "user" | "dt";
-declare type CompilerTestKind = "conformance" | "compiler";
-declare type FourslashTestKind = "fourslash" | "fourslash-shims" | "fourslash-shims-pp" | "fourslash-server";
-declare abstract class RunnerBase {
-    tests: (string | Harness.FileBasedTest)[];
-    /** Add a source file to the runner's list of tests that need to be initialized with initializeTests */
-    addTest(fileName: string): void;
-    enumerateFiles(folder: string, regex?: RegExp, options?: {
-        recursive: boolean;
-    }): string[];
-    abstract kind(): TestRunnerKind;
-    abstract enumerateTestFiles(): (string | Harness.FileBasedTest)[];
-    /** The working directory where tests are found. Needed for batch testing where the input path will differ from the output path inside baselines */
-    workingDirectory: string;
-    /** Setup the runner's tests so that they are ready to be executed by the harness
-     *  The first test should be a describe/it block that sets up the harness's compiler instance appropriately
-     */
-    abstract initializeTests(): void;
-    /** Replaces instances of full paths with fileNames only */
-    static removeFullPaths(path: string): string;
-}
-declare namespace Harness.SourceMapRecorder {
-    function getSourceMapRecord(sourceMapDataList: ReadonlyArray<ts.SourceMapData>, program: ts.Program, jsFiles: ReadonlyArray<documents.TextDocument>, declarationFiles: ReadonlyArray<documents.TextDocument>): string;
-}
-declare var _chai: typeof chai;
-declare var assert: typeof _chai.assert;
-declare var global: NodeJS.Global;
-declare var window: {};
-declare var XMLHttpRequest: {
-    new (): XMLHttpRequest;
-};
-interface XMLHttpRequest {
-    readonly readyState: number;
-    readonly responseText: string;
-    readonly status: number;
-    readonly statusText: string;
-    open(method: string, url: string, async?: boolean, user?: string, password?: string): void;
-    send(data?: string): void;
-    setRequestHeader(header: string, value: string): void;
-    getAllResponseHeaders(): string;
-    getResponseHeader(header: string): string | null;
-    overrideMimeType(mime: string): void;
-}
-declare namespace Utils {
-    const enum ExecutionEnvironment {
-        Node = 0,
-        Browser = 1
-    }
-    function getExecutionEnvironment(): ExecutionEnvironment;
-    let currentExecutionEnvironment: ExecutionEnvironment;
-    function encodeString(s: string): string;
-    function byteLength(s: string, encoding?: string): number;
-    function evalFile(fileContents: string, fileName: string, nodeContext?: any): void;
-    /** Splits the given string on \r\n, or on only \n if that fails, or on only \r if *that* fails. */
-    function splitContentByNewlines(content: string): string[];
-    /** Reads a file under /tests */
-    function readTestFile(path: string): string | undefined;
-    function memoize<T extends ts.AnyFunction>(f: T, memoKey: (...anything: any[]) => string): T;
-    const canonicalizeForHarness: ts.GetCanonicalFileName;
-    function assertInvariants(node: ts.Node | undefined, parent: ts.Node | undefined): void;
-    function convertDiagnostics(diagnostics: ReadonlyArray<ts.Diagnostic>): {
-        start: number | undefined;
-        length: number | undefined;
-        messageText: string;
-        category: string;
-        code: number;
-    }[];
-    function sourceFileToJSON(file: ts.Node): string;
-    function assertDiagnosticsEquals(array1: ReadonlyArray<ts.Diagnostic>, array2: ReadonlyArray<ts.Diagnostic>): void;
-    function assertStructuralEquals(node1: ts.Node, node2: ts.Node): void;
-    function filterStack(error: Error, stackTraceLimit?: number): Error;
-}
-declare namespace Harness {
-    interface IO {
-        newLine(): string;
-        getCurrentDirectory(): string;
-        useCaseSensitiveFileNames(): boolean;
-        resolvePath(path: string): string | undefined;
-        getFileSize(path: string): number;
-        readFile(path: string): string | undefined;
-        writeFile(path: string, contents: string): void;
-        directoryName(path: string): string | undefined;
-        getDirectories(path: string): string[];
-        createDirectory(path: string): void;
-        fileExists(fileName: string): boolean;
-        directoryExists(path: string): boolean;
-        deleteFile(fileName: string): void;
-        enumerateTestFiles(runner: RunnerBase): (string | FileBasedTest)[];
-        listFiles(path: string, filter?: RegExp, options?: {
-            recursive?: boolean;
-        }): string[];
-        log(text: string): void;
-        args(): string[];
-        getExecutingFilePath(): string;
-        getWorkspaceRoot(): string;
-        exit(exitCode?: number): void;
-        readDirectory(path: string, extension?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
-        getAccessibleFileSystemEntries(dirname: string): ts.FileSystemEntries;
-        tryEnableSourceMapsForHost?(): void;
-        getEnvironmentVariable?(name: string): string;
-        getMemoryUsage?(): number | undefined;
-    }
-    let IO: IO;
-    const harnessNewLine = "\r\n";
-    const virtualFileSystemRoot = "/";
-    function mockHash(s: string): string;
-}
-declare namespace Harness {
-    const libFolder = "built/local/";
-    const tcServicesFile: string;
-    type SourceMapEmitterCallback = (emittedFile: string, emittedLine: number, emittedColumn: number, sourceFile: string, sourceLine: number, sourceColumn: number, sourceName: string) => void;
-    let userSpecifiedRoot: string;
-    let lightMode: boolean;
-    /** Functionality for compiling TypeScript code */
-    namespace Compiler {
-        /** Aggregate various writes into a single array of lines. Useful for passing to the
-         *  TypeScript compiler to fill with source code or errors.
-         */
-        class WriterAggregator {
-            lines: string[];
-            currentLine: string;
-            Write(str: string): void;
-            WriteLine(str: string): void;
-            Close(): void;
-            reset(): void;
-        }
-        function createSourceFileAndAssertInvariants(fileName: string, sourceText: string, languageVersion: ts.ScriptTarget): ts.SourceFile;
-        const defaultLibFileName = "lib.d.ts";
-        const es2015DefaultLibFileName = "lib.es2015.d.ts";
-        function getDefaultLibrarySourceFile(fileName?: string): ts.SourceFile | undefined;
-        function getDefaultLibFileName(options: ts.CompilerOptions): string;
-        const fourslashFileName = "fourslash.ts";
-        let fourslashSourceFile: ts.SourceFile;
-        function getCanonicalFileName(fileName: string): string;
-        interface HarnessOptions {
-            useCaseSensitiveFileNames?: boolean;
-            includeBuiltFile?: string;
-            baselineFile?: string;
-            libFiles?: string;
-        }
-        function setCompilerOptionsFromHarnessSetting(settings: TestCaseParser.CompilerSettings, options: ts.CompilerOptions & HarnessOptions): void;
-        interface TestFile {
-            unitName: string;
-            content: string;
-            fileOptions?: any;
-        }
-        function compileFiles(inputFiles: TestFile[], otherFiles: TestFile[], harnessSettings: TestCaseParser.CompilerSettings | undefined, compilerOptions: ts.CompilerOptions | undefined, currentDirectory: string | undefined): compiler.CompilationResult;
-        interface DeclarationCompilationContext {
-            declInputFiles: TestFile[];
-            declOtherFiles: TestFile[];
-            harnessSettings: TestCaseParser.CompilerSettings & HarnessOptions | undefined;
-            options: ts.CompilerOptions;
-            currentDirectory: string;
-        }
-        function prepareDeclarationCompilationContext(inputFiles: ReadonlyArray<TestFile>, otherFiles: ReadonlyArray<TestFile>, result: compiler.CompilationResult, harnessSettings: TestCaseParser.CompilerSettings & HarnessOptions, options: ts.CompilerOptions, currentDirectory: string | undefined): DeclarationCompilationContext | undefined;
-        function compileDeclarationFiles(context: DeclarationCompilationContext | undefined): {
-            declInputFiles: TestFile[];
-            declOtherFiles: TestFile[];
-            declResult: compiler.CompilationResult;
-        } | undefined;
-        function minimalDiagnosticsToString(diagnostics: ReadonlyArray<ts.Diagnostic>, pretty?: boolean): string;
-        function getErrorBaseline(inputFiles: ReadonlyArray<TestFile>, diagnostics: ReadonlyArray<ts.Diagnostic>, pretty?: boolean): string;
-        const diagnosticSummaryMarker = "__diagnosticSummary";
-        const globalErrorsMarker = "__globalErrors";
-        function iterateErrorBaseline(inputFiles: ReadonlyArray<TestFile>, diagnostics: ReadonlyArray<ts.Diagnostic>, options?: {
-            pretty?: boolean;
-            caseSensitive?: boolean;
-            currentDirectory?: string;
-        }): IterableIterator<[string, string, number]>;
-        function doErrorBaseline(baselinePath: string, inputFiles: ReadonlyArray<TestFile>, errors: ReadonlyArray<ts.Diagnostic>, pretty?: boolean): void;
-        function doTypeAndSymbolBaseline(baselinePath: string, program: ts.Program, allFiles: {
-            unitName: string;
-            content: string;
-        }[], opts?: Baseline.BaselineOptions, multifile?: boolean, skipTypeBaselines?: boolean, skipSymbolBaselines?: boolean): void;
-        function doSourcemapBaseline(baselinePath: string, options: ts.CompilerOptions, result: compiler.CompilationResult, harnessSettings: TestCaseParser.CompilerSettings): void;
-        function doJsEmitBaseline(baselinePath: string, header: string, options: ts.CompilerOptions, result: compiler.CompilationResult, tsConfigFiles: ReadonlyArray<TestFile>, toBeCompiled: ReadonlyArray<TestFile>, otherFiles: ReadonlyArray<TestFile>, harnessSettings: TestCaseParser.CompilerSettings): void;
-        function collateOutputs(outputFiles: ReadonlyArray<documents.TextDocument>): string;
-        function iterateOutputs(outputFiles: Iterable<documents.TextDocument>): IterableIterator<[string, string]>;
-        function sanitizeTestFilePath(name: string): string;
-    }
-    interface FileBasedTest {
-        file: string;
-        configurations?: FileBasedTestConfiguration[];
-    }
-    interface FileBasedTestConfiguration {
-        [key: string]: string;
-    }
-    /**
-     * Compute FileBasedTestConfiguration variations based on a supplied list of variable settings.
-     */
-    function getFileBasedTestConfigurations(settings: TestCaseParser.CompilerSettings, varyBy: string[]): FileBasedTestConfiguration[] | undefined;
-    /**
-     * Compute a description for this configuration based on its entries
-     */
-    function getFileBasedTestConfigurationDescription(configuration: FileBasedTestConfiguration): string;
-    namespace TestCaseParser {
-        /** all the necessary information to set the right compiler settings */
-        interface CompilerSettings {
-            [name: string]: string;
-        }
-        /** All the necessary information to turn a multi file test into useful units for later compilation */
-        interface TestUnitData {
-            content: string;
-            name: string;
-            fileOptions: any;
-            originalFilePath: string;
-            references: string[];
-        }
-        function extractCompilerSettings(content: string): CompilerSettings;
-        interface TestCaseContent {
-            settings: CompilerSettings;
-            testUnitData: TestUnitData[];
-            tsConfig: ts.ParsedCommandLine | undefined;
-            tsConfigFileUnitData: TestUnitData | undefined;
-        }
-        /** Given a test file containing // @FileName directives, return an array of named units of code to be added to an existing compiler instance */
-        function makeUnitsFromTest(code: string, fileName: string, rootDir?: string, settings?: CompilerSettings): TestCaseContent;
-    }
-    /** Support class for baseline files */
-    namespace Baseline {
-        interface BaselineOptions {
-            Subfolder?: string;
-            Baselinefolder?: string;
-        }
-        function localPath(fileName: string, baselineFolder?: string, subfolder?: string): string;
-        function runBaseline(relativeFileName: string, generateContent: () => string | null, opts?: BaselineOptions): void;
-        function runMultifileBaseline(relativeFileBase: string, extension: string, generateContent: () => IterableIterator<[string, string, number]> | IterableIterator<[string, string]> | null, opts?: BaselineOptions, referencedExtensions?: string[]): void;
-    }
-    function isDefaultLibraryFile(filePath: string): boolean;
-    function isBuiltFile(filePath: string): boolean;
-    function getDefaultLibraryFile(filePath: string, io: IO): Compiler.TestFile;
-    function getConfigNameFromFileName(filename: string): "tsconfig.json" | "jsconfig.json" | undefined;
-}
-declare namespace Harness.LanguageService {
-    class ScriptInfo {
-        fileName: string;
-        content: string;
-        isRootFile: boolean;
-        version: number;
-        editRanges: {
-            length: number;
-            textChangeRange: ts.TextChangeRange;
-        }[];
-        private lineMap;
-        constructor(fileName: string, content: string, isRootFile: boolean);
-        private setContent;
-        getLineMap(): number[];
-        updateContent(content: string): void;
-        editContent(start: number, end: number, newText: string): void;
-        getTextChangeRangeBetweenVersions(startVersion: number, endVersion: number): ts.TextChangeRange;
-    }
-    class DefaultHostCancellationToken implements ts.HostCancellationToken {
-        static readonly instance: DefaultHostCancellationToken;
-        isCancellationRequested(): boolean;
-    }
-    interface LanguageServiceAdapter {
-        getHost(): LanguageServiceAdapterHost;
-        getLanguageService(): ts.LanguageService;
-        getClassifier(): ts.Classifier;
-        getPreProcessedFileInfo(fileName: string, fileContents: string): ts.PreProcessedFileInfo;
-    }
-    abstract class LanguageServiceAdapterHost {
-        protected cancellationToken: DefaultHostCancellationToken;
-        protected settings: ts.CompilerOptions;
-        readonly sys: fakes.System;
-        typesRegistry: ts.Map<void> | undefined;
-        private scriptInfos;
-        constructor(cancellationToken?: DefaultHostCancellationToken, settings?: ts.CompilerOptions);
-        readonly vfs: vfs.FileSystem;
-        getNewLine(): string;
-        getFilenames(): string[];
-        getScriptInfo(fileName: string): ScriptInfo | undefined;
-        addScript(fileName: string, content: string, isRootFile: boolean): void;
-        editScript(fileName: string, start: number, end: number, newText: string): void;
-        openFile(_fileName: string, _content?: string, _scriptKindName?: string): void;
-        /**
-         * @param line 0 based index
-         * @param col 0 based index
-         */
-        positionToLineAndCharacter(fileName: string, position: number): ts.LineAndCharacter;
-    }
-    class NativeLanguageServiceHost extends LanguageServiceAdapterHost implements ts.LanguageServiceHost, LanguageServiceAdapterHost {
-        isKnownTypesPackageName(name: string): boolean;
-        installPackage: typeof ts.notImplemented;
-        getCompilationSettings(): ts.CompilerOptions;
-        getCancellationToken(): DefaultHostCancellationToken;
-        getDirectories(path: string): string[];
-        getCurrentDirectory(): string;
-        getDefaultLibFileName(): string;
-        getScriptFileNames(): string[];
-        getScriptSnapshot(fileName: string): ts.IScriptSnapshot | undefined;
-        getScriptKind(): ts.ScriptKind;
-        getScriptVersion(fileName: string): string;
-        directoryExists(dirName: string): boolean;
-        fileExists(fileName: string): boolean;
-        readDirectory(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
-        readFile(path: string): string | undefined;
-        realpath(path: string): string;
-        getTypeRootsVersion(): number;
-        log: typeof ts.noop;
-        trace: typeof ts.noop;
-        error: typeof ts.noop;
-    }
-    class NativeLanguageServiceAdapter implements LanguageServiceAdapter {
-        private host;
-        constructor(cancellationToken?: ts.HostCancellationToken, options?: ts.CompilerOptions);
-        getHost(): LanguageServiceAdapterHost;
-        getLanguageService(): ts.LanguageService;
-        getClassifier(): ts.Classifier;
-        getPreProcessedFileInfo(fileName: string, fileContents: string): ts.PreProcessedFileInfo;
-    }
-    class ShimLanguageServiceHost extends LanguageServiceAdapterHost implements ts.LanguageServiceShimHost, ts.CoreServicesShimHost {
-        private nativeHost;
-        getModuleResolutionsForFile: (fileName: string) => string;
-        getTypeReferenceDirectiveResolutionsForFile: (fileName: string) => string;
-        constructor(preprocessToResolve: boolean, cancellationToken?: ts.HostCancellationToken, options?: ts.CompilerOptions);
-        getFilenames(): string[];
-        getScriptInfo(fileName: string): ScriptInfo | undefined;
-        addScript(fileName: string, content: string, isRootFile: boolean): void;
-        editScript(fileName: string, start: number, end: number, newText: string): void;
-        positionToLineAndCharacter(fileName: string, position: number): ts.LineAndCharacter;
-        getCompilationSettings(): string;
-        getCancellationToken(): ts.HostCancellationToken;
-        getCurrentDirectory(): string;
-        getDirectories(path: string): string;
-        getDefaultLibFileName(): string;
-        getScriptFileNames(): string;
-        getScriptSnapshot(fileName: string): ts.ScriptSnapshotShim;
-        getScriptKind(): ts.ScriptKind;
-        getScriptVersion(fileName: string): string;
-        getLocalizedDiagnosticMessages(): string;
-        readDirectory: typeof ts.notImplemented;
-        readDirectoryNames: typeof ts.notImplemented;
-        readFileNames: typeof ts.notImplemented;
-        fileExists(fileName: string): boolean;
-        readFile(fileName: string): string | undefined;
-        log(s: string): void;
-        trace(s: string): void;
-        error(s: string): void;
-        directoryExists(): boolean;
-    }
-    class ShimLanguageServiceAdapter implements LanguageServiceAdapter {
-        private host;
-        private factory;
-        constructor(preprocessToResolve: boolean, cancellationToken?: ts.HostCancellationToken, options?: ts.CompilerOptions);
-        getHost(): ShimLanguageServiceHost;
-        getLanguageService(): ts.LanguageService;
-        getClassifier(): ts.Classifier;
-        getPreProcessedFileInfo(fileName: string, fileContents: string): ts.PreProcessedFileInfo;
-    }
-    class SessionClientHost extends NativeLanguageServiceHost implements ts.server.SessionClientHost {
-        private client;
-        constructor(cancellationToken: ts.HostCancellationToken | undefined, settings: ts.CompilerOptions | undefined);
-        onMessage: typeof ts.noop;
-        writeMessage: typeof ts.noop;
-        setClient(client: ts.server.SessionClient): void;
-        openFile(fileName: string, content?: string, scriptKindName?: "TS" | "JS" | "TSX" | "JSX"): void;
-        editScript(fileName: string, start: number, end: number, newText: string): void;
-    }
-    class ServerLanguageServiceAdapter implements LanguageServiceAdapter {
-        private host;
-        private client;
-        constructor(cancellationToken?: ts.HostCancellationToken, options?: ts.CompilerOptions);
-        getHost(): SessionClientHost;
-        getLanguageService(): ts.LanguageService;
-        getClassifier(): ts.Classifier;
-        getPreProcessedFileInfo(): ts.PreProcessedFileInfo;
-    }
-}
-declare namespace ts.TestFSWithWatch {
-    const libFile: File;
-    const safeList: {
-        path: Path;
-        content: string;
-    };
-    interface TestServerHostCreationParameters {
-        useCaseSensitiveFileNames?: boolean;
-        executingFilePath?: string;
-        currentDirectory?: string;
-        newLine?: string;
-        useWindowsStylePaths?: boolean;
-        environmentVariables?: Map<string>;
-    }
-    function createWatchedSystem(fileOrFolderList: ReadonlyArray<FileOrFolderOrSymLink>, params?: TestServerHostCreationParameters): TestServerHost;
-    function createServerHost(fileOrFolderList: ReadonlyArray<FileOrFolderOrSymLink>, params?: TestServerHostCreationParameters): TestServerHost;
-    interface File {
-        path: string;
-        content: string;
-        fileSize?: number;
-    }
-    interface Folder {
-        path: string;
-    }
-    interface SymLink {
-        path: string;
-        symLink: string;
-    }
-    type FileOrFolderOrSymLink = File | Folder | SymLink;
-    function verifyMapSize(caption: string, map: Map<any>, expectedKeys: ReadonlyArray<string>): void;
-    function checkMultiMapKeyCount(caption: string, actual: MultiMap<any>, expectedKeys: ReadonlyMap<number>): void;
-    function checkMultiMapKeyCount(caption: string, actual: MultiMap<any>, expectedKeys: ReadonlyArray<string>, eachKeyCount: number): void;
-    function checkArray(caption: string, actual: ReadonlyArray<string>, expected: ReadonlyArray<string>): void;
-    function checkWatchedFiles(host: TestServerHost, expectedFiles: string[]): void;
-    function checkWatchedFilesDetailed(host: TestServerHost, expectedFiles: ReadonlyMap<number>): void;
-    function checkWatchedFilesDetailed(host: TestServerHost, expectedFiles: ReadonlyArray<string>, eachFileWatchCount: number): void;
-    function checkWatchedDirectories(host: TestServerHost, expectedDirectories: string[], recursive: boolean): void;
-    function checkWatchedDirectoriesDetailed(host: TestServerHost, expectedDirectories: ReadonlyMap<number>, recursive: boolean): void;
-    function checkWatchedDirectoriesDetailed(host: TestServerHost, expectedDirectories: ReadonlyArray<string>, eachDirectoryWatchCount: number, recursive: boolean): void;
-    function checkOutputContains(host: TestServerHost, expected: ReadonlyArray<string>): void;
-    function checkOutputDoesNotContain(host: TestServerHost, expectedToBeAbsent: string[] | ReadonlyArray<string>): void;
-    type TimeOutCallback = () => any;
-    interface TestFileWatcher {
-        cb: FileWatcherCallback;
-        fileName: string;
-    }
-    interface TestDirectoryWatcher {
-        cb: DirectoryWatcherCallback;
-        directoryName: string;
-    }
-    interface ReloadWatchInvokeOptions {
-        /** Invokes the directory watcher for the parent instead of the file changed */
-        invokeDirectoryWatcherInsteadOfFileChanged: boolean;
-        /** When new file is created, do not invoke watches for it */
-        ignoreWatchInvokedWithTriggerAsFileCreate: boolean;
-        /** Invoke the file delete, followed by create instead of file changed */
-        invokeFileDeleteCreateAsPartInsteadOfChange: boolean;
-    }
-    enum Tsc_WatchDirectory {
-        WatchFile = "RecursiveDirectoryUsingFsWatchFile",
-        NonRecursiveWatchDirectory = "RecursiveDirectoryUsingNonRecursiveWatchDirectory",
-        DynamicPolling = "RecursiveDirectoryUsingDynamicPriorityPolling"
-    }
-    class TestServerHost implements server.ServerHost, FormatDiagnosticsHost, ModuleResolutionHost {
-        withSafeList: boolean;
-        useCaseSensitiveFileNames: boolean;
-        readonly newLine: string;
-        readonly useWindowsStylePath?: boolean | undefined;
-        private readonly environmentVariables?;
-        args: string[];
-        private readonly output;
-        private fs;
-        private time;
-        getCanonicalFileName: (s: string) => string;
-        private toPath;
-        private timeoutCallbacks;
-        private immediateCallbacks;
-        readonly screenClears: number[];
-        readonly watchedDirectories: MultiMap<TestDirectoryWatcher>;
-        readonly watchedDirectoriesRecursive: MultiMap<TestDirectoryWatcher>;
-        readonly watchedFiles: MultiMap<TestFileWatcher>;
-        private readonly executingFilePath;
-        private readonly currentDirectory;
-        private readonly dynamicPriorityWatchFile;
-        private readonly customRecursiveWatchDirectory;
-        constructor(withSafeList: boolean, useCaseSensitiveFileNames: boolean, executingFilePath: string, currentDirectory: string, fileOrFolderorSymLinkList: ReadonlyArray<FileOrFolderOrSymLink>, newLine?: string, useWindowsStylePath?: boolean | undefined, environmentVariables?: Map<string> | undefined);
-        getNewLine(): string;
-        toNormalizedAbsolutePath(s: string): string;
-        toFullPath(s: string): Path;
-        getHostSpecificPath(s: string): string;
-        private now;
-        reloadFS(fileOrFolderOrSymLinkList: ReadonlyArray<FileOrFolderOrSymLink>, options?: Partial<ReloadWatchInvokeOptions>): void;
-        modifyFile(filePath: string, content: string, options?: Partial<ReloadWatchInvokeOptions>): void;
-        renameFolder(folderName: string, newFolderName: string): void;
-        private renameFolderEntries;
-        ensureFileOrFolder(fileOrDirectoryOrSymLink: FileOrFolderOrSymLink, ignoreWatchInvokedWithTriggerAsFileCreate?: boolean): void;
-        private ensureFolder;
-        private addFileOrFolderInFolder;
-        private removeFileOrFolder;
-        removeFolder(folderPath: string, recursive?: boolean): void;
-        invokeWatchedDirectoriesCallback(folderFullPath: string, relativePath: string): void;
-        invokeWatchedDirectoriesRecursiveCallback(folderFullPath: string, relativePath: string): void;
-        invokeFileWatcher(fileFullPath: string, eventKind: FileWatcherEventKind, useFileNameInCallback?: boolean): void;
-        private getRelativePathToDirectory;
-        /**
-         * This will call the directory watcher for the folderFullPath and recursive directory watchers for this and base folders
-         */
-        private invokeDirectoryWatcher;
-        private directoryCallback;
-        /**
-         * This will call the recursive directory watcher for this directory as well as all the base directories
-         */
-        private invokeRecursiveDirectoryWatcher;
-        private toFsEntry;
-        private toFsFile;
-        private toFsSymLink;
-        private toFsFolder;
-        private getRealFsEntry;
-        private isFsFile;
-        private getRealFile;
-        private isFsFolder;
-        private getRealFolder;
-        fileExists(s: string): boolean;
-        getModifiedTime(s: string): Date;
-        readFile(s: string): string | undefined;
-        getFileSize(s: string): number;
-        directoryExists(s: string): boolean;
-        getDirectories(s: string): string[];
-        readDirectory(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
-        watchDirectory(directoryName: string, cb: DirectoryWatcherCallback, recursive: boolean): FileWatcher;
-        createHash(s: string): string;
-        createSHA256Hash(s: string): string;
-        watchFile(fileName: string, cb: FileWatcherCallback, pollingInterval: number): FileWatcher;
-        setTimeout(callback: TimeOutCallback, _time: number, ...args: any[]): number;
-        getNextTimeoutId(): number;
-        clearTimeout(timeoutId: any): void;
-        clearScreen(): void;
-        checkTimeoutQueueLengthAndRun(expected: number): void;
-        checkTimeoutQueueLength(expected: number): void;
-        runQueuedTimeoutCallbacks(timeoutId?: number): void;
-        runQueuedImmediateCallbacks(checkCount?: number): void;
-        setImmediate(callback: TimeOutCallback, _time: number, ...args: any[]): number;
-        clearImmediate(timeoutId: any): void;
-        createDirectory(directoryName: string): void;
-        writeFile(path: string, content: string): void;
-        write(message: string): void;
-        getOutput(): ReadonlyArray<string>;
-        clearOutput(): void;
-        realpath(s: string): string;
-        readonly exitMessage: string;
-        exitCode: number | undefined;
-        readonly resolvePath: (s: string) => string;
-        readonly getExecutingFilePath: () => string;
-        readonly getCurrentDirectory: () => string;
-        exit(exitCode?: number): void;
-        getEnvironmentVariable(name: string): string;
-    }
-}
-declare namespace FourSlash {
-    import ArrayOrSingle = FourSlashInterface.ArrayOrSingle;
-    const enum FourSlashTestType {
-        Native = 0,
-        Shims = 1,
-        ShimsWithPreprocess = 2,
-        Server = 3
-    }
-    interface FourSlashFile {
-        content: string;
-        fileName: string;
-        symlinks?: string[];
-        version: number;
-        fileOptions: Harness.TestCaseParser.CompilerSettings;
-    }
-    interface FourSlashData {
-        globalOptions: Harness.TestCaseParser.CompilerSettings;
-        files: FourSlashFile[];
-        markerPositions: ts.Map<Marker>;
-        markers: Marker[];
-        /**
-         * Inserted in source files by surrounding desired text
-         * in a range with `[|` and `|]`. For example,
-         *
-         * [|text in range|]
-         *
-         * is a range with `text in range` "selected".
-         */
-        ranges: Range[];
-    }
-    interface Marker {
-        fileName: string;
-        position: number;
-        data?: {};
-    }
-    interface Range {
-        fileName: string;
-        pos: number;
-        end: number;
-        marker?: Marker;
-    }
-    interface TextSpan {
-        start: number;
-        end: number;
-    }
-    class TestCancellationToken implements ts.HostCancellationToken {
-        private static readonly notCanceled;
-        private numberOfCallsBeforeCancellation;
-        isCancellationRequested(): boolean;
-        setCancelled(numberOfCalls?: number): void;
-        resetCancelled(): void;
-    }
-    function verifyOperationIsCancelled(f: () => void): void;
-    class TestState {
-        private basePath;
-        private testType;
-        testData: FourSlashData;
-        private languageServiceAdapterHost;
-        private languageService;
-        private cancellationToken;
-        currentCaretPosition: number;
-        selectionEnd: number;
-        lastKnownMarker: string;
-        activeFile: FourSlashFile;
-        enableFormatting: boolean;
-        formatCodeSettings: ts.FormatCodeSettings;
-        private inputFiles;
-        private static getDisplayPartsJson;
-        private addMatchedInputFile;
-        private getLanguageServiceAdapter;
-        constructor(basePath: string, testType: FourSlashTestType, testData: FourSlashData);
-        private getFileContent;
-        goToMarker(name?: string | Marker): void;
-        goToEachMarker(markers: ReadonlyArray<Marker>, action: (marker: Marker, index: number) => void): void;
-        goToEachRange(action: () => void): void;
-        markerName(m: Marker): string;
-        goToPosition(pos: number): void;
-        select(startMarker: string, endMarker: string): void;
-        selectRange(range: Range): void;
-        moveCaretRight(count?: number): void;
-        openFile(indexOrName: number | string, content?: string, scriptKindName?: string): void;
-        verifyErrorExistsBetweenMarkers(startMarkerName: string, endMarkerName: string, shouldExist: boolean): void;
-        private raiseError;
-        private messageAtLastKnownMarker;
-        private assertionMessageAtLastKnownMarker;
-        private getDiagnostics;
-        private getAllDiagnostics;
-        verifyErrorExistsAfterMarker(markerName: string, shouldExist: boolean, after: boolean): void;
-        private anyErrorInRange;
-        private printErrorLog;
-        private formatRange;
-        private formatLineAndCharacterOfPosition;
-        private formatPosition;
-        verifyNoErrors(): void;
-        verifyNumberOfErrorsInCurrentFile(expected: number): void;
-        verifyEval(expr: string, value: any): void;
-        verifyGoToDefinitionIs(endMarker: ArrayOrSingle<string>): void;
-        verifyGoToDefinition(arg0: any, endMarkerNames?: ArrayOrSingle<string>): void;
-        private getGoToDefinition;
-        private getGoToDefinitionAndBoundSpan;
-        verifyGoToType(arg0: any, endMarkerNames?: ArrayOrSingle<string>): void;
-        private verifyGoToX;
-        private verifyGoToXPlain;
-        verifyGoToDefinitionForMarkers(markerNames: string[]): void;
-        private verifyGoToXSingle;
-        private verifyGoToXWorker;
-        private verifyDefinitionTextSpan;
-        verifyGetEmitOutputForCurrentFile(expected: string): void;
-        verifyGetEmitOutputContentsForCurrentFile(expected: ts.OutputFile[]): void;
-        verifyCompletionListCount(expectedCount: number, negative: boolean): void;
-        verifyCompletionListItemsCountIsGreaterThan(count: number, negative: boolean): void;
-        verifyCompletionListStartsWithItemsInOrder(items: string[]): void;
-        noItemsWithSameNameButDifferentKind(): void;
-        verifyCompletionListIsEmpty(negative: boolean): void;
-        verifyCompletionListAllowsNewIdentifier(negative: boolean): void;
-        verifyCompletionListIsGlobal(expected: boolean): void;
-        verifyCompletions(options: FourSlashInterface.VerifyCompletionsOptions): void;
-        private verifyCompletionsWorker;
-        private verifyCompletionEntry;
-        private verifyCompletionsAreExactly;
-        verifyCompletionsAt(markerName: string | ReadonlyArray<string>, expected: ReadonlyArray<FourSlashInterface.ExpectedCompletionEntry>, options?: FourSlashInterface.CompletionsAtOptions): void;
-        verifyCompletionListContains(entryId: ts.Completions.CompletionEntryIdentifier, text?: string, documentation?: string, kind?: string | {
-            kind?: string;
-            kindModifiers?: string;
-        }, spanIndex?: number, hasAction?: boolean, options?: FourSlashInterface.VerifyCompletionListContainsOptions): void;
-        /**
-         * Verify that the completion list does NOT contain the given symbol.
-         * The symbol is considered matched with the symbol in the list if and only if all given parameters must matched.
-         * When any parameter is omitted, the parameter is ignored during comparison and assumed that the parameter with
-         * that property of the symbol in the list.
-         * @param symbol the name of symbol
-         * @param expectedText the text associated with the symbol
-         * @param expectedDocumentation the documentation text associated with the symbol
-         * @param expectedKind the kind of symbol (see ScriptElementKind)
-         * @param spanIndex the index of the range that the completion item's replacement text span should match
-         */
-        verifyCompletionListDoesNotContain(entryId: ts.Completions.CompletionEntryIdentifier, expectedText?: string, expectedDocumentation?: string, expectedKind?: string | {
-            kind?: string;
-            kindModifiers?: string;
-        }, spanIndex?: number, options?: FourSlashInterface.CompletionsAtOptions): void;
-        verifyCompletionEntryDetails(entryName: string, expectedText: string, expectedDocumentation?: string, kind?: string, tags?: ts.JSDocTagInfo[]): void;
-        /** Use `getProgram` instead of accessing this directly. */
-        private _program;
-        /** Use `getChecker` instead of accessing this directly. */
-        private _checker;
-        private getProgram;
-        private getChecker;
-        private getSourceFile;
-        private getNode;
-        private goToAndGetNode;
-        private verifyRange;
-        private verifySymbol;
-        verifySymbolAtLocation(startRange: Range, declarationRanges: Range[]): void;
-        symbolsInScope(range: Range): ts.Symbol[];
-        setTypesRegistry(map: ts.MapLike<void>): void;
-        verifyTypeOfSymbolAtLocation(range: Range, symbol: ts.Symbol, expected: string): void;
-        private verifyDocumentHighlightsRespectFilesList;
-        verifyReferenceGroups(starts: ArrayOrSingle<string> | ArrayOrSingle<Range>, parts: ReadonlyArray<FourSlashInterface.ReferenceGroup>): void;
-        verifyNoReferences(markerNameOrRange?: string | Range): void;
-        verifyGetReferencesForServerTest(expected: ReadonlyArray<ts.ReferenceEntry>): void;
-        verifySingleReferenceGroup(definition: FourSlashInterface.ReferenceGroupDefinition, ranges?: Range[]): void;
-        private assertObjectsEqual;
-        verifyDisplayPartsOfReferencedSymbol(expected: ts.SymbolDisplayPart[]): void;
-        private getCompletionListAtCaret;
-        private getCompletionEntryDetails;
-        private getReferencesAtCaret;
-        private findReferencesAtCaret;
-        getSyntacticDiagnostics(expected: ReadonlyArray<FourSlashInterface.Diagnostic>): void;
-        getSemanticDiagnostics(expected: ReadonlyArray<FourSlashInterface.Diagnostic>): void;
-        getSuggestionDiagnostics(expected: ReadonlyArray<FourSlashInterface.Diagnostic>): void;
-        private testDiagnostics;
-        verifyQuickInfoAt(markerName: string, expectedText: string, expectedDocumentation?: string): void;
-        verifyQuickInfos(namesAndTexts: {
-            [name: string]: string | [string, string];
-        }): void;
-        verifyQuickInfoString(expectedText: string, expectedDocumentation?: string): void;
-        verifyQuickInfoDisplayParts(kind: string, kindModifiers: string, textSpan: TextSpan, displayParts: ts.SymbolDisplayPart[], documentation: ts.SymbolDisplayPart[], tags: ts.JSDocTagInfo[]): void;
-        verifyRangesAreRenameLocations(options?: Range[] | {
-            findInStrings?: boolean;
-            findInComments?: boolean;
-            ranges?: Range[];
-        }): void;
-        verifyRenameLocations(startRanges: ArrayOrSingle<Range>, options: Range[] | {
-            findInStrings?: boolean;
-            findInComments?: boolean;
-            ranges: Range[];
-        }): void;
-        verifyQuickInfoExists(negative: boolean): void;
-        verifyNoSignatureHelp(markers: ReadonlyArray<string>): void;
-        verifySignatureHelp(optionses: ReadonlyArray<FourSlashInterface.VerifySignatureHelpOptions>): void;
-        private verifySignatureHelpWorker;
-        private validate;
-        verifyRenameInfoSucceeded(displayName?: string, fullDisplayName?: string, kind?: string, kindModifiers?: string): void;
-        verifyRenameInfoFailed(message?: string): void;
-        private alignmentForExtraInfo;
-        private spanInfoToString;
-        private baselineCurrentFileLocations;
-        getBreakpointStatementLocation(pos: number): ts.TextSpan | undefined;
-        baselineCurrentFileBreakpointLocations(): void;
-        baselineGetEmitOutput(insertResultsIntoVfs?: boolean): void;
-        baselineQuickInfo(): void;
-        printBreakpointLocation(pos: number): void;
-        printBreakpointAtCurrentLocation(): void;
-        printCurrentParameterHelp(): void;
-        printCurrentQuickInfo(): void;
-        printErrorList(): void;
-        printCurrentFileState(showWhitespace: boolean, makeCaretVisible: boolean): void;
-        printCurrentSignatureHelp(): void;
-        private getSignatureHelp;
-        printCompletionListMembers(preferences: ts.UserPreferences | undefined): void;
-        private printMembersOrCompletions;
-        printContext(): void;
-        deleteChar(count?: number): void;
-        replace(start: number, length: number, text: string): void;
-        deleteCharBehindMarker(count?: number): void;
-        type(text: string, highFidelity?: boolean): void;
-        paste(text: string): void;
-        private checkPostEditInvariants;
-        /**
-         * @returns The number of characters added to the file as a result of the edits.
-         * May be negative.
-         */
-        private applyEdits;
-        copyFormatOptions(): ts.FormatCodeSettings;
-        setFormatOptions(formatCodeOptions: ts.FormatCodeOptions | ts.FormatCodeSettings): ts.FormatCodeSettings;
-        formatDocument(): void;
-        formatSelection(start: number, end: number): void;
-        formatOnType(pos: number, key: string): void;
-        private editScriptAndUpdateMarkers;
-        private removeWhitespace;
-        goToBOF(): void;
-        goToEOF(): void;
-        goToRangeStart({ fileName, pos }: Range): void;
-        goToTypeDefinition(definitionIndex: number): void;
-        verifyTypeDefinitionsCount(negative: boolean, expectedCount: number): void;
-        verifyImplementationListIsEmpty(negative: boolean): void;
-        verifyGoToDefinitionName(expectedName: string, expectedContainerName: string): void;
-        goToImplementation(): void;
-        verifyRangesInImplementationList(markerName: string): void;
-        getMarkers(): Marker[];
-        getMarkerNames(): string[];
-        getRanges(): Range[];
-        rangesByText(): ts.Map<Range[]>;
-        private rangeText;
-        verifyCaretAtMarker(markerName?: string): void;
-        private getIndentation;
-        verifyIndentationAtCurrentPosition(numberOfSpaces: number, indentStyle?: ts.IndentStyle, baseIndentSize?: number): void;
-        verifyIndentationAtPosition(fileName: string, position: number, numberOfSpaces: number, indentStyle?: ts.IndentStyle, baseIndentSize?: number): void;
-        verifyCurrentLineContent(text: string): void;
-        verifyCurrentFileContent(text: string): void;
-        private verifyFileContent;
-        verifyTextAtCaretIs(text: string): void;
-        verifyCurrentNameOrDottedNameSpanText(text: string): undefined;
-        private getNameOrDottedNameSpan;
-        baselineCurrentFileNameOrDottedNameSpans(): void;
-        printNameOrDottedNameSpans(pos: number): void;
-        private verifyClassifications;
-        verifyProjectInfo(expected: string[]): void;
-        verifySemanticClassifications(expected: {
-            classificationType: string;
-            text: string;
-        }[]): void;
-        verifySyntacticClassifications(expected: {
-            classificationType: string;
-            text: string;
-        }[]): void;
-        printOutliningSpans(): void;
-        verifyOutliningSpans(spans: Range[], kind?: "comment" | "region" | "code" | "imports"): void;
-        verifyTodoComments(descriptors: string[], spans: Range[]): void;
-        /**
-         * Finds and applies a code action corresponding to the supplied parameters.
-         * If index is undefined, applies the unique code action available.
-         * @param errorCode The error code that generated the code action.
-         * @param index The nth (0-index-based) codeaction available generated by errorCode.
-         */
-        getAndApplyCodeActions(errorCode?: number, index?: number): void;
-        applyCodeActionFromCompletion(markerName: string, options: FourSlashInterface.VerifyCompletionActionOptions): void;
-        verifyRangeIs(expectedText: string, includeWhiteSpace?: boolean): void;
-        /**
-         * Compares expected text to the text that would be in the sole range
-         * (ie: [|...|]) in the file after applying the codefix sole codefix
-         * in the source file.
-         */
-        verifyRangeAfterCodeFix(expectedText: string, includeWhiteSpace?: boolean, errorCode?: number, index?: number): void;
-        verifyCodeFixAll({ fixId, fixAllDescription, newFileContent, commands: expectedCommands }: FourSlashInterface.VerifyCodeFixAllOptions): void;
-        /**
-         * Applies fixes for the errors in fileName and compares the results to
-         * expectedContents after all fixes have been applied.
-         *
-         * Note: applying one codefix may generate another (eg: remove duplicate implements
-         * may generate an extends -> interface conversion fix).
-         * @param expectedContents The contents of the file after the fixes are applied.
-         * @param fileName The file to check. If not supplied, the current open file is used.
-         */
-        verifyFileAfterCodeFix(expectedContents: string, fileName?: string): void;
-        verifyCodeFix(options: FourSlashInterface.VerifyCodeFixOptions): void;
-        private verifyNewContent;
-        /**
-         * Rerieves a codefix satisfying the parameters, or undefined if no such codefix is found.
-         * @param fileName Path to file where error should be retrieved from.
-         */
-        private getCodeFixes;
-        private applyCodeActions;
-        private applyChanges;
-        verifyImportFixAtPosition(expectedTextArray: string[], errorCode: number | undefined, preferences: ts.UserPreferences | undefined): void;
-        verifyDocCommentTemplate(expected: ts.TextInsertion | undefined): void;
-        verifyBraceCompletionAtPosition(negative: boolean, openingBrace: string): void;
-        verifyJsxClosingTag(map: {
-            [markerName: string]: ts.JsxClosingTagInfo | undefined;
-        }): void;
-        verifyMatchingBracePosition(bracePosition: number, expectedMatchPosition: number): void;
-        verifyNoMatchingBracePosition(bracePosition: number): void;
-        verifySpanOfEnclosingComment(negative: boolean, onlyMultiLineDiverges?: boolean): void;
-        verifyNavigationItemsCount(expected: number, searchValue: string, matchKind?: string, fileName?: string): void;
-        verifyNavigationItemsListContains(name: string, kind: string, searchValue: string, matchKind: string, fileName?: string, parentName?: string): void;
-        verifyNavigationBar(json: any, options: {
-            checkSpans?: boolean;
-        } | undefined): void;
-        verifyNavigationTree(json: any, options: {
-            checkSpans?: boolean;
-        } | undefined): void;
-        private verifyNavigationTreeOrBar;
-        printNavigationItems(searchValue: string): void;
-        printNavigationBar(): void;
-        private getOccurrencesAtCurrentPosition;
-        verifyOccurrencesAtPositionListContains(fileName: string, start: number, end: number, isWriteAccess?: boolean): undefined;
-        verifyOccurrencesAtPositionListCount(expectedCount: number): void;
-        private getDocumentHighlightsAtCurrentPosition;
-        verifyRangesAreOccurrences(isWriteAccess?: boolean): void;
-        verifyRangesWithSameTextAreRenameLocations(): void;
-        verifyRangesWithSameTextAreDocumentHighlights(): void;
-        verifyDocumentHighlightsOf(startRange: Range, ranges: Range[], options: FourSlashInterface.VerifyDocumentHighlightsOptions | undefined): void;
-        verifyRangesAreDocumentHighlights(ranges: Range[] | undefined, options: FourSlashInterface.VerifyDocumentHighlightsOptions | undefined): void;
-        verifyNoDocumentHighlights(startRange: Range): void;
-        private verifyDocumentHighlights;
-        verifyCodeFixAvailable(negative: boolean, expected: FourSlashInterface.VerifyCodeFixAvailableOptions[] | undefined): void;
-        verifyApplicableRefactorAvailableAtMarker(negative: boolean, markerName: string): void;
-        private getSelection;
-        verifyRefactorAvailable(negative: boolean, name: string, actionName?: string): void;
-        verifyRefactor({ name, actionName, refactors }: FourSlashInterface.VerifyRefactorOptions): void;
-        verifyApplicableRefactorAvailableForRange(negative: boolean): void;
-        applyRefactor({ refactorName, actionName, actionDescription, newContent: newContentWithRenameMarker }: FourSlashInterface.ApplyRefactorOptions): void;
-        noMoveToNewFile(): void;
-        moveToNewFile(options: FourSlashInterface.MoveToNewFileOptions): void;
-        private testNewFileContents;
-        verifyFileAfterApplyingRefactorAtMarker(markerName: string, expectedContent: string, refactorNameToApply: string, actionName: string, formattingOptions?: ts.FormatCodeSettings): void;
-        printAvailableCodeFixes(): void;
-        private getCurrentLineContent;
-        private assertItemInCompletionList;
-        private findFile;
-        private getLineColStringAtPosition;
-        private getTextSpanForRangeAtIndex;
-        getMarkerByName(markerName: string): Marker;
-        setCancelled(numberOfCalls: number): void;
-        resetCancelled(): void;
-        private static textSpansEqual;
-        getEditsForFileRename(options: FourSlashInterface.GetEditsForFileRenameOptions): void;
-        private getApplicableRefactors;
-    }
-    function runFourSlashTest(basePath: string, testType: FourSlashTestType, fileName: string): void;
-    function runFourSlashTestContent(basePath: string, testType: FourSlashTestType, content: string, fileName: string): void;
-}
-declare namespace FourSlashInterface {
-    class Test {
-        private state;
-        constructor(state: FourSlash.TestState);
-        markers(): FourSlash.Marker[];
-        markerNames(): string[];
-        marker(name: string): FourSlash.Marker;
-        markerName(m: FourSlash.Marker): string;
-        ranges(): FourSlash.Range[];
-        spans(): ts.TextSpan[];
-        rangesByText(): ts.Map<FourSlash.Range[]>;
-        markerByName(s: string): FourSlash.Marker;
-        symbolsInScope(range: FourSlash.Range): ts.Symbol[];
-        setTypesRegistry(map: ts.MapLike<void>): void;
-    }
-    class GoTo {
-        private state;
-        constructor(state: FourSlash.TestState);
-        marker(name?: string | FourSlash.Marker): void;
-        eachMarker(markers: ReadonlyArray<string>, action: (marker: FourSlash.Marker, index: number) => void): void;
-        eachMarker(action: (marker: FourSlash.Marker, index: number) => void): void;
-        rangeStart(range: FourSlash.Range): void;
-        eachRange(action: () => void): void;
-        bof(): void;
-        eof(): void;
-        implementation(): void;
-        position(position: number, fileNameOrIndex?: string | number): void;
-        file(indexOrName: number | string, content?: string, scriptKindName?: string): void;
-        select(startMarker: string, endMarker: string): void;
-        selectRange(range: FourSlash.Range): void;
-    }
-    class VerifyNegatable {
-        protected state: FourSlash.TestState;
-        private negative;
-        not: VerifyNegatable;
-        allowedClassElementKeywords: string[];
-        allowedConstructorParameterKeywords: string[];
-        constructor(state: FourSlash.TestState, negative?: boolean);
-        completionListCount(expectedCount: number): void;
-        completionListContains(entryId: string | ts.Completions.CompletionEntryIdentifier, text?: string, documentation?: string, kind?: string | {
-            kind?: string;
-            kindModifiers?: string;
-        }, spanIndex?: number, hasAction?: boolean, options?: VerifyCompletionListContainsOptions): void;
-        completionListItemsCountIsGreaterThan(count: number): void;
-        assertHasRanges(ranges: FourSlash.Range[]): void;
-        completionListIsEmpty(): void;
-        completionListContainsClassElementKeywords(): void;
-        completionListContainsConstructorParameterKeywords(): void;
-        completionListIsGlobal(expected: boolean): void;
-        completionListAllowsNewIdentifier(): void;
-        noSignatureHelp(...markers: string[]): void;
-        signatureHelp(...options: VerifySignatureHelpOptions[]): void;
-        errorExistsBetweenMarkers(startMarker: string, endMarker: string): void;
-        errorExistsAfterMarker(markerName?: string): void;
-        errorExistsBeforeMarker(markerName?: string): void;
-        quickInfoExists(): void;
-        typeDefinitionCountIs(expectedCount: number): void;
-        implementationListIsEmpty(): void;
-        isValidBraceCompletionAtPosition(openingBrace: string): void;
-        jsxClosingTag(map: {
-            [markerName: string]: ts.JsxClosingTagInfo | undefined;
-        }): void;
-        isInCommentAtPosition(onlyMultiLineDiverges?: boolean): void;
-        codeFix(options: VerifyCodeFixOptions): void;
-        codeFixAvailable(options?: VerifyCodeFixAvailableOptions[]): void;
-        applicableRefactorAvailableAtMarker(markerName: string): void;
-        applicableRefactorAvailableForRange(): void;
-        refactor(options: VerifyRefactorOptions): void;
-        refactorAvailable(name: string, actionName?: string): void;
-    }
-    class Verify extends VerifyNegatable {
-        constructor(state: FourSlash.TestState);
-        completionsAt(markerName: ArrayOrSingle<string>, completions: ReadonlyArray<ExpectedCompletionEntry>, options?: CompletionsAtOptions): void;
-        completions(...optionsArray: VerifyCompletionsOptions[]): void;
-        quickInfoIs(expectedText: string, expectedDocumentation?: string): void;
-        quickInfoAt(markerName: string, expectedText: string, expectedDocumentation?: string): void;
-        quickInfos(namesAndTexts: {
-            [name: string]: string;
-        }): void;
-        caretAtMarker(markerName?: string): void;
-        indentationIs(numberOfSpaces: number): void;
-        indentationAtPositionIs(fileName: string, position: number, numberOfSpaces: number, indentStyle?: ts.IndentStyle, baseIndentSize?: number): void;
-        textAtCaretIs(text: string): void;
-        /**
-         * Compiles the current file and evaluates 'expr' in a context containing
-         * the emitted output, then compares (using ===) the result of that expression
-         * to 'value'. Do not use this function with external modules as it is not supported.
-         */
-        eval(expr: string, value: any): void;
-        currentLineContentIs(text: string): void;
-        currentFileContentIs(text: string): void;
-        goToDefinitionIs(endMarkers: ArrayOrSingle<string>): void;
-        goToDefinition(startMarkerName: ArrayOrSingle<string>, endMarkerName: ArrayOrSingle<string>, range?: FourSlash.Range): void;
-        goToDefinition(startsAndEnds: [ArrayOrSingle<string>, ArrayOrSingle<string>][] | {
-            [startMarkerName: string]: ArrayOrSingle<string>;
-        }): void;
-        goToType(startMarkerName: ArrayOrSingle<string>, endMarkerName: ArrayOrSingle<string>): void;
-        goToType(startsAndEnds: [ArrayOrSingle<string>, ArrayOrSingle<string>][] | {
-            [startMarkerName: string]: ArrayOrSingle<string>;
-        }): void;
-        goToDefinitionForMarkers(...markerNames: string[]): void;
-        goToDefinitionName(name: string, containerName: string): void;
-        verifyGetEmitOutputForCurrentFile(expected: string): void;
-        verifyGetEmitOutputContentsForCurrentFile(expected: ts.OutputFile[]): void;
-        symbolAtLocation(startRange: FourSlash.Range, ...declarationRanges: FourSlash.Range[]): void;
-        typeOfSymbolAtLocation(range: FourSlash.Range, symbol: ts.Symbol, expected: string): void;
-        referenceGroups(starts: ArrayOrSingle<string> | ArrayOrSingle<FourSlash.Range>, parts: ReferenceGroup[]): void;
-        noReferences(markerNameOrRange?: string | FourSlash.Range): void;
-        getReferencesForServerTest(expected: ReadonlyArray<ts.ReferenceEntry>): void;
-        singleReferenceGroup(definition: ReferenceGroupDefinition, ranges?: FourSlash.Range[]): void;
-        findReferencesDefinitionDisplayPartsAtCaretAre(expected: ts.SymbolDisplayPart[]): void;
-        noErrors(): void;
-        numberOfErrorsInCurrentFile(expected: number): void;
-        baselineCurrentFileBreakpointLocations(): void;
-        baselineCurrentFileNameOrDottedNameSpans(): void;
-        baselineGetEmitOutput(insertResultsIntoVfs?: boolean): void;
-        baselineQuickInfo(): void;
-        nameOrDottedNameSpanTextIs(text: string): void;
-        outliningSpansInCurrentFile(spans: FourSlash.Range[], kind?: "comment" | "region" | "code" | "imports"): void;
-        todoCommentsInCurrentFile(descriptors: string[]): void;
-        matchingBracePositionInCurrentFile(bracePosition: number, expectedMatchPosition: number): void;
-        noMatchingBracePositionInCurrentFile(bracePosition: number): void;
-        docCommentTemplateAt(marker: string | FourSlash.Marker, expectedOffset: number, expectedText: string): void;
-        noDocCommentTemplateAt(marker: string | FourSlash.Marker): void;
-        rangeAfterCodeFix(expectedText: string, includeWhiteSpace?: boolean, errorCode?: number, index?: number): void;
-        codeFixAll(options: VerifyCodeFixAllOptions): void;
-        fileAfterApplyingRefactorAtMarker(markerName: string, expectedContent: string, refactorNameToApply: string, actionName: string, formattingOptions?: ts.FormatCodeSettings): void;
-        rangeIs(expectedText: string, includeWhiteSpace?: boolean): void;
-        getAndApplyCodeFix(errorCode?: number, index?: number): void;
-        applyCodeActionFromCompletion(markerName: string, options: VerifyCompletionActionOptions): void;
-        importFixAtPosition(expectedTextArray: string[], errorCode?: number, preferences?: ts.UserPreferences): void;
-        navigationBar(json: any, options?: {
-            checkSpans?: boolean;
-        }): void;
-        navigationTree(json: any, options?: {
-            checkSpans?: boolean;
-        }): void;
-        navigationItemsListCount(count: number, searchValue: string, matchKind?: string, fileName?: string): void;
-        navigationItemsListContains(name: string, kind: string, searchValue: string, matchKind: string, fileName?: string, parentName?: string): void;
-        occurrencesAtPositionContains(range: FourSlash.Range, isWriteAccess?: boolean): void;
-        occurrencesAtPositionCount(expectedCount: number): void;
-        rangesAreOccurrences(isWriteAccess?: boolean): void;
-        rangesWithSameTextAreRenameLocations(): void;
-        rangesAreRenameLocations(options?: FourSlash.Range[] | {
-            findInStrings?: boolean;
-            findInComments?: boolean;
-            ranges?: FourSlash.Range[];
-        }): void;
-        rangesAreDocumentHighlights(ranges?: FourSlash.Range[], options?: VerifyDocumentHighlightsOptions): void;
-        rangesWithSameTextAreDocumentHighlights(): void;
-        documentHighlightsOf(startRange: FourSlash.Range, ranges: FourSlash.Range[], options?: VerifyDocumentHighlightsOptions): void;
-        noDocumentHighlights(startRange: FourSlash.Range): void;
-        completionEntryDetailIs(entryName: string, text: string, documentation?: string, kind?: string, tags?: ts.JSDocTagInfo[]): void;
-        /**
-         * This method *requires* a contiguous, complete, and ordered stream of classifications for a file.
-         */
-        syntacticClassificationsAre(...classifications: {
-            classificationType: string;
-            text: string;
-        }[]): void;
-        /**
-         * This method *requires* an ordered stream of classifications for a file, and spans are highly recommended.
-         */
-        semanticClassificationsAre(...classifications: Classification[]): void;
-        renameInfoSucceeded(displayName?: string, fullDisplayName?: string, kind?: string, kindModifiers?: string): void;
-        renameInfoFailed(message?: string): void;
-        renameLocations(startRanges: ArrayOrSingle<FourSlash.Range>, options: FourSlash.Range[] | {
-            findInStrings?: boolean;
-            findInComments?: boolean;
-            ranges: FourSlash.Range[];
-        }): void;
-        verifyQuickInfoDisplayParts(kind: string, kindModifiers: string, textSpan: FourSlash.TextSpan, displayParts: ts.SymbolDisplayPart[], documentation: ts.SymbolDisplayPart[], tags: ts.JSDocTagInfo[]): void;
-        getSyntacticDiagnostics(expected: ReadonlyArray<Diagnostic>): void;
-        getSemanticDiagnostics(expected: ReadonlyArray<Diagnostic>): void;
-        getSuggestionDiagnostics(expected: ReadonlyArray<Diagnostic>): void;
-        ProjectInfo(expected: string[]): void;
-        allRangesAppearInImplementationList(markerName: string): void;
-        getEditsForFileRename(options: GetEditsForFileRenameOptions): void;
-        moveToNewFile(options: MoveToNewFileOptions): void;
-        noMoveToNewFile(): void;
-    }
-    class Edit {
-        private state;
-        constructor(state: FourSlash.TestState);
-        backspace(count?: number): void;
-        deleteAtCaret(times?: number): void;
-        replace(start: number, length: number, text: string): void;
-        paste(text: string): void;
-        insert(text: string): void;
-        insertLine(text: string): void;
-        insertLines(...lines: string[]): void;
-        moveRight(count?: number): void;
-        moveLeft(count?: number): void;
-        enableFormatting(): void;
-        disableFormatting(): void;
-        applyRefactor(options: ApplyRefactorOptions): void;
-    }
-    class Debug {
-        private state;
-        constructor(state: FourSlash.TestState);
-        printCurrentParameterHelp(): void;
-        printCurrentFileState(): void;
-        printCurrentFileStateWithWhitespace(): void;
-        printCurrentFileStateWithoutCaret(): void;
-        printCurrentQuickInfo(): void;
-        printCurrentSignatureHelp(): void;
-        printCompletionListMembers(options: ts.UserPreferences | undefined): void;
-        printAvailableCodeFixes(): void;
-        printBreakpointLocation(pos: number): void;
-        printBreakpointAtCurrentLocation(): void;
-        printNameOrDottedNameSpans(pos: number): void;
-        printErrorList(): void;
-        printNavigationItems(searchValue?: string): void;
-        printNavigationBar(): void;
-        printContext(): void;
-        printOutliningSpans(): void;
-    }
-    class Format {
-        private state;
-        constructor(state: FourSlash.TestState);
-        document(): void;
-        copyFormatOptions(): ts.FormatCodeSettings;
-        setFormatOptions(options: ts.FormatCodeOptions): ts.FormatCodeSettings;
-        selection(startMarker: string, endMarker: string): void;
-        onType(posMarker: string, key: string): void;
-        setOption(name: keyof ts.FormatCodeSettings, value: number | string | boolean): void;
-    }
-    class Cancellation {
-        private state;
-        constructor(state: FourSlash.TestState);
-        resetCancelled(): void;
-        setCancelled(numberOfCalls?: number): void;
-    }
-    interface Classification {
-        classificationType: ts.ClassificationTypeNames;
-        text: string;
-        textSpan?: FourSlash.TextSpan;
-    }
-    namespace Classification {
-        function comment(text: string, position?: number): Classification;
-        function identifier(text: string, position?: number): Classification;
-        function keyword(text: string, position?: number): Classification;
-        function numericLiteral(text: string, position?: number): Classification;
-        function operator(text: string, position?: number): Classification;
-        function stringLiteral(text: string, position?: number): Classification;
-        function whiteSpace(text: string, position?: number): Classification;
-        function text(text: string, position?: number): Classification;
-        function punctuation(text: string, position?: number): Classification;
-        function docCommentTagName(text: string, position?: number): Classification;
-        function className(text: string, position?: number): Classification;
-        function enumName(text: string, position?: number): Classification;
-        function interfaceName(text: string, position?: number): Classification;
-        function moduleName(text: string, position?: number): Classification;
-        function typeParameterName(text: string, position?: number): Classification;
-        function parameterName(text: string, position?: number): Classification;
-        function typeAliasName(text: string, position?: number): Classification;
-        function jsxOpenTagName(text: string, position?: number): Classification;
-        function jsxCloseTagName(text: string, position?: number): Classification;
-        function jsxSelfClosingTagName(text: string, position?: number): Classification;
-        function jsxAttribute(text: string, position?: number): Classification;
-        function jsxText(text: string, position?: number): Classification;
-        function jsxAttributeStringLiteralValue(text: string, position?: number): Classification;
-    }
-    interface ReferenceGroup {
-        definition: ReferenceGroupDefinition;
-        ranges: FourSlash.Range[];
-    }
-    type ReferenceGroupDefinition = string | {
-        text: string;
-        range: FourSlash.Range;
-    };
-    interface ApplyRefactorOptions {
-        refactorName: string;
-        actionName: string;
-        actionDescription: string;
-        newContent: string;
-    }
-    type ExpectedCompletionEntry = string | {
-        readonly name: string;
-        readonly insertText?: string;
-        readonly replacementSpan?: FourSlash.Range;
-        readonly hasAction?: boolean;
-        readonly isRecommended?: boolean;
-        readonly kind?: string;
-        readonly text: string;
-        readonly documentation: string;
-        readonly sourceDisplay?: string;
-    };
-    interface CompletionsAtOptions extends Partial<ts.UserPreferences> {
-        triggerCharacter?: ts.CompletionsTriggerCharacter;
-        isNewIdentifierLocation?: boolean;
-    }
-    interface VerifyCompletionsOptions {
-        readonly marker?: ArrayOrSingle<string>;
-        readonly isNewIdentifierLocation?: boolean;
-        readonly exact?: ArrayOrSingle<ExpectedCompletionEntry>;
-        readonly includes?: ArrayOrSingle<ExpectedCompletionEntry>;
-        readonly excludes?: ArrayOrSingle<string | {
-            readonly name: string;
-            readonly source: string;
-        }>;
-        readonly preferences?: ts.UserPreferences;
-        readonly triggerCharacter?: ts.CompletionsTriggerCharacter;
-    }
-    interface VerifySignatureHelpOptions {
-        readonly marker?: ArrayOrSingle<string>;
-        /** @default 1 */
-        readonly overloadsCount?: number;
-        /** @default undefined */
-        readonly docComment?: string;
-        readonly text?: string;
-        readonly parameterName?: string;
-        readonly parameterSpan?: string;
-        /** @default undefined */
-        readonly parameterDocComment?: string;
-        readonly parameterCount?: number;
-        readonly argumentCount?: number;
-        /** @default false */
-        readonly isVariadic?: boolean;
-        /** @default ts.emptyArray */
-        readonly tags?: ReadonlyArray<ts.JSDocTagInfo>;
-    }
-    type ArrayOrSingle<T> = T | ReadonlyArray<T>;
-    interface VerifyCompletionListContainsOptions extends ts.UserPreferences {
-        triggerCharacter?: ts.CompletionsTriggerCharacter;
-        sourceDisplay: string;
-        isRecommended?: true;
-        insertText?: string;
-        replacementSpan?: FourSlash.Range;
-    }
-    interface VerifyDocumentHighlightsOptions {
-        filesToSearch?: ReadonlyArray<string>;
-    }
-    interface NewContentOptions {
-        newFileContent?: string | {
-            readonly [filename: string]: string;
-        };
-        newRangeContent?: string;
-    }
-    interface VerifyCodeFixOptions extends NewContentOptions {
-        description: string;
-        errorCode?: number;
-        index?: number;
-        preferences?: ts.UserPreferences;
-    }
-    interface VerifyCodeFixAvailableOptions {
-        description: string;
-        commands?: ts.CodeActionCommand[];
-    }
-    interface VerifyCodeFixAllOptions {
-        fixId: string;
-        fixAllDescription: string;
-        newFileContent: string;
-        commands: ReadonlyArray<{}>;
-    }
-    interface VerifyRefactorOptions {
-        name: string;
-        actionName: string;
-        refactors: ts.ApplicableRefactorInfo[];
-    }
-    interface VerifyCompletionActionOptions extends NewContentOptions {
-        name: string;
-        source?: string;
-        description: string;
-        preferences?: ts.UserPreferences;
-    }
-    interface Diagnostic {
-        message: string;
-        range?: FourSlash.Range;
-        code: number;
-        reportsUnnecessary?: true;
-    }
-    interface GetEditsForFileRenameOptions {
-        readonly oldPath: string;
-        readonly newPath: string;
-        readonly newFileContents: {
-            readonly [fileName: string]: string;
-        };
-    }
-    interface MoveToNewFileOptions {
-        readonly newFileContents: {
-            readonly [fileName: string]: string;
-        };
-        readonly preferences?: ts.UserPreferences;
-    }
-}
-interface TypeWriterTypeResult {
-    line: number;
-    syntaxKind: number;
-    sourceText: string;
-    type: string;
-}
-interface TypeWriterSymbolResult {
-    line: number;
-    syntaxKind: number;
-    sourceText: string;
-    symbol: string;
-}
-interface TypeWriterResult {
-    line: number;
-    syntaxKind: number;
-    sourceText: string;
-    symbol?: string;
-    type?: string;
-}
-declare class TypeWriterWalker {
-    private program;
-    currentSourceFile: ts.SourceFile;
-    private checker;
-    constructor(program: ts.Program, fullTypeCheck: boolean);
-    getSymbols(fileName: string): IterableIterator<TypeWriterSymbolResult>;
-    getTypes(fileName: string): IterableIterator<TypeWriterTypeResult>;
-    private visitNode;
-    private writeTypeOrSymbol;
-}
-interface FileInformation {
-    contents?: string;
-    contentsPath?: string;
-    codepage: number;
-    bom?: string;
-}
-interface FindFileResult {
-}
-interface IoLogFile {
-    path: string;
-    codepage: number;
-    result?: FileInformation;
-}
-interface IoLog {
-    timestamp: string;
-    arguments: string[];
-    executingPath: string;
-    currentDirectory: string;
-    useCustomLibraryFile?: boolean;
-    filesRead: IoLogFile[];
-    filesWritten: {
-        path: string;
-        contents?: string;
-        contentsPath?: string;
-        bom: boolean;
-    }[];
-    filesDeleted: string[];
-    filesAppended: {
-        path: string;
-        contents?: string;
-        contentsPath?: string;
-    }[];
-    fileExists: {
-        path: string;
-        result?: boolean;
-    }[];
-    filesFound: {
-        path: string;
-        pattern: string;
-        result?: FindFileResult;
-    }[];
-    dirs: {
-        path: string;
-        re: string;
-        re_m: boolean;
-        re_g: boolean;
-        re_i: boolean;
-        opts: {
-            recursive?: boolean;
-        };
-        result?: string[];
-    }[];
-    dirExists: {
-        path: string;
-        result?: boolean;
-    }[];
-    dirsCreated: string[];
-    pathsResolved: {
-        path: string;
-        result?: string;
-    }[];
-    directoriesRead: {
-        path: string;
-        extensions: ReadonlyArray<string> | undefined;
-        exclude: ReadonlyArray<string> | undefined;
-        include: ReadonlyArray<string> | undefined;
-        depth: number | undefined;
-        result: ReadonlyArray<string>;
-    }[];
-    useCaseSensitiveFileNames?: boolean;
-}
-interface PlaybackControl {
-    startReplayFromFile(logFileName: string): void;
-    startReplayFromString(logContents: string): void;
-    startReplayFromData(log: IoLog): void;
-    endReplay(): void;
-    startRecord(logFileName: string): void;
-    endRecord(): void;
-}
-declare namespace Playback {
-    interface PlaybackIO extends Harness.IO, PlaybackControl {
-    }
-    interface PlaybackSystem extends ts.System, PlaybackControl {
-    }
-    function newStyleLogIntoOldStyleLog(log: IoLog, host: ts.System | Harness.IO, baseName: string): IoLog;
-    function oldStyleLogIntoNewStyleLog(log: IoLog, writeFile: typeof Harness.IO.writeFile, baseTestName: string): IoLog;
-    function wrapIO(underlying: Harness.IO): PlaybackIO;
-    function wrapSystem(underlying: ts.System): PlaybackSystem;
-}
diff --git a/src/built/local/harness.js b/src/built/local/harness.js
deleted file mode 100644
index d1db38a129e..00000000000
--- a/src/built/local/harness.js
+++ /dev/null
@@ -1,11641 +0,0 @@
-"use strict";
-var __generator = (this && this.__generator) || function (thisArg, body) {
-    var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
-    return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
-    function verb(n) { return function (v) { return step([n, v]); }; }
-    function step(op) {
-        if (f) throw new TypeError("Generator is already executing.");
-        while (_) try {
-            if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
-            if (y = 0, t) op = [op[0] & 2, t.value];
-            switch (op[0]) {
-                case 0: case 1: t = op; break;
-                case 4: _.label++; return { value: op[1], done: false };
-                case 5: _.label++; y = op[1]; op = [0]; continue;
-                case 7: op = _.ops.pop(); _.trys.pop(); continue;
-                default:
-                    if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
-                    if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
-                    if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
-                    if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
-                    if (t[2]) _.ops.pop();
-                    _.trys.pop(); continue;
-            }
-            op = body.call(thisArg, _);
-        } catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
-        if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
-    }
-};
-var __values = (this && this.__values) || function (o) {
-    var m = typeof Symbol === "function" && o[Symbol.iterator], i = 0;
-    if (m) return m.call(o);
-    return {
-        next: function () {
-            if (o && i >= o.length) o = void 0;
-            return { value: o && o[i++], done: !o };
-        }
-    };
-};
-var __assign = (this && this.__assign) || Object.assign || function(t) {
-    for (var s, i = 1, n = arguments.length; i < n; i++) {
-        s = arguments[i];
-        for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
-            t[p] = s[p];
-    }
-    return t;
-};
-var __extends = (this && this.__extends) || (function () {
-    var extendStatics = Object.setPrototypeOf ||
-        ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
-        function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
-    return function (d, b) {
-        extendStatics(d, b);
-        function __() { this.constructor = d; }
-        d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
-    };
-})();
-var collections;
-(function (collections) {
-    var SortedMap = /** @class */ (function () {
-        function SortedMap(comparer, iterable) {
-            this._keys = [];
-            this._values = [];
-            this._version = 0;
-            this._copyOnWrite = false;
-            this._comparer = typeof comparer === "object" ? comparer.comparer : comparer;
-            this._order = typeof comparer === "object" && comparer.sort === "insertion" ? [] : undefined;
-            if (iterable) {
-                var iterator = getIterator(iterable);
-                try {
-                    for (var i = nextResult(iterator); i; i = nextResult(iterator)) {
-                        var _a = i.value, key = _a[0], value = _a[1];
-                        this.set(key, value);
-                    }
-                }
-                finally {
-                    closeIterator(iterator);
-                }
-            }
-        }
-        Object.defineProperty(SortedMap.prototype, "size", {
-            get: function () {
-                return this._keys.length;
-            },
-            enumerable: true,
-            configurable: true
-        });
-        Object.defineProperty(SortedMap.prototype, "comparer", {
-            get: function () {
-                return this._comparer;
-            },
-            enumerable: true,
-            configurable: true
-        });
-        Object.defineProperty(SortedMap.prototype, Symbol.toStringTag, {
-            get: function () {
-                return "SortedMap";
-            },
-            enumerable: true,
-            configurable: true
-        });
-        SortedMap.prototype.has = function (key) {
-            return ts.binarySearch(this._keys, key, ts.identity, this._comparer) >= 0;
-        };
-        SortedMap.prototype.get = function (key) {
-            var index = ts.binarySearch(this._keys, key, ts.identity, this._comparer);
-            return index >= 0 ? this._values[index] : undefined;
-        };
-        SortedMap.prototype.set = function (key, value) {
-            var index = ts.binarySearch(this._keys, key, ts.identity, this._comparer);
-            if (index >= 0) {
-                this._values[index] = value;
-            }
-            else {
-                this.writePreamble();
-                insertAt(this._keys, ~index, key);
-                insertAt(this._values, ~index, value);
-                if (this._order)
-                    insertAt(this._order, ~index, this._version);
-                this.writePostScript();
-            }
-            return this;
-        };
-        SortedMap.prototype.delete = function (key) {
-            var index = ts.binarySearch(this._keys, key, ts.identity, this._comparer);
-            if (index >= 0) {
-                this.writePreamble();
-                ts.orderedRemoveItemAt(this._keys, index);
-                ts.orderedRemoveItemAt(this._values, index);
-                if (this._order)
-                    ts.orderedRemoveItemAt(this._order, index);
-                this.writePostScript();
-                return true;
-            }
-            return false;
-        };
-        SortedMap.prototype.clear = function () {
-            if (this.size > 0) {
-                this.writePreamble();
-                this._keys.length = 0;
-                this._values.length = 0;
-                if (this._order)
-                    this._order.length = 0;
-                this.writePostScript();
-            }
-        };
-        SortedMap.prototype.forEach = function (callback, thisArg) {
-            var keys = this._keys;
-            var values = this._values;
-            var indices = this.getIterationOrder();
-            var version = this._version;
-            this._copyOnWrite = true;
-            try {
-                if (indices) {
-                    for (var _i = 0, indices_1 = indices; _i < indices_1.length; _i++) {
-                        var i = indices_1[_i];
-                        callback.call(thisArg, values[i], keys[i], this);
-                    }
-                }
-                else {
-                    for (var i = 0; i < keys.length; i++) {
-                        callback.call(thisArg, values[i], keys[i], this);
-                    }
-                }
-            }
-            finally {
-                if (version === this._version) {
-                    this._copyOnWrite = false;
-                }
-            }
-        };
-        SortedMap.prototype.keys = function () {
-            var keys, indices, version, _i, indices_2, i;
-            return __generator(this, function (_a) {
-                switch (_a.label) {
-                    case 0:
-                        keys = this._keys;
-                        indices = this.getIterationOrder();
-                        version = this._version;
-                        this._copyOnWrite = true;
-                        _a.label = 1;
-                    case 1:
-                        _a.trys.push([1, , 9, 10]);
-                        if (!indices) return [3 /*break*/, 6];
-                        _i = 0, indices_2 = indices;
-                        _a.label = 2;
-                    case 2:
-                        if (!(_i < indices_2.length)) return [3 /*break*/, 5];
-                        i = indices_2[_i];
-                        return [4 /*yield*/, keys[i]];
-                    case 3:
-                        _a.sent();
-                        _a.label = 4;
-                    case 4:
-                        _i++;
-                        return [3 /*break*/, 2];
-                    case 5: return [3 /*break*/, 8];
-                    case 6: return [5 /*yield**/, __values(keys)];
-                    case 7:
-                        _a.sent();
-                        _a.label = 8;
-                    case 8: return [3 /*break*/, 10];
-                    case 9:
-                        if (version === this._version) {
-                            this._copyOnWrite = false;
-                        }
-                        return [7 /*endfinally*/];
-                    case 10: return [2 /*return*/];
-                }
-            });
-        };
-        SortedMap.prototype.values = function () {
-            var values, indices, version, _i, indices_3, i;
-            return __generator(this, function (_a) {
-                switch (_a.label) {
-                    case 0:
-                        values = this._values;
-                        indices = this.getIterationOrder();
-                        version = this._version;
-                        this._copyOnWrite = true;
-                        _a.label = 1;
-                    case 1:
-                        _a.trys.push([1, , 9, 10]);
-                        if (!indices) return [3 /*break*/, 6];
-                        _i = 0, indices_3 = indices;
-                        _a.label = 2;
-                    case 2:
-                        if (!(_i < indices_3.length)) return [3 /*break*/, 5];
-                        i = indices_3[_i];
-                        return [4 /*yield*/, values[i]];
-                    case 3:
-                        _a.sent();
-                        _a.label = 4;
-                    case 4:
-                        _i++;
-                        return [3 /*break*/, 2];
-                    case 5: return [3 /*break*/, 8];
-                    case 6: return [5 /*yield**/, __values(values)];
-                    case 7:
-                        _a.sent();
-                        _a.label = 8;
-                    case 8: return [3 /*break*/, 10];
-                    case 9:
-                        if (version === this._version) {
-                            this._copyOnWrite = false;
-                        }
-                        return [7 /*endfinally*/];
-                    case 10: return [2 /*return*/];
-                }
-            });
-        };
-        SortedMap.prototype.entries = function () {
-            var keys, values, indices, version, _i, indices_4, i, i;
-            return __generator(this, function (_a) {
-                switch (_a.label) {
-                    case 0:
-                        keys = this._keys;
-                        values = this._values;
-                        indices = this.getIterationOrder();
-                        version = this._version;
-                        this._copyOnWrite = true;
-                        _a.label = 1;
-                    case 1:
-                        _a.trys.push([1, , 11, 12]);
-                        if (!indices) return [3 /*break*/, 6];
-                        _i = 0, indices_4 = indices;
-                        _a.label = 2;
-                    case 2:
-                        if (!(_i < indices_4.length)) return [3 /*break*/, 5];
-                        i = indices_4[_i];
-                        return [4 /*yield*/, [keys[i], values[i]]];
-                    case 3:
-                        _a.sent();
-                        _a.label = 4;
-                    case 4:
-                        _i++;
-                        return [3 /*break*/, 2];
-                    case 5: return [3 /*break*/, 10];
-                    case 6:
-                        i = 0;
-                        _a.label = 7;
-                    case 7:
-                        if (!(i < keys.length)) return [3 /*break*/, 10];
-                        return [4 /*yield*/, [keys[i], values[i]]];
-                    case 8:
-                        _a.sent();
-                        _a.label = 9;
-                    case 9:
-                        i++;
-                        return [3 /*break*/, 7];
-                    case 10: return [3 /*break*/, 12];
-                    case 11:
-                        if (version === this._version) {
-                            this._copyOnWrite = false;
-                        }
-                        return [7 /*endfinally*/];
-                    case 12: return [2 /*return*/];
-                }
-            });
-        };
-        SortedMap.prototype[Symbol.iterator] = function () {
-            return this.entries();
-        };
-        SortedMap.prototype.writePreamble = function () {
-            if (this._copyOnWrite) {
-                this._keys = this._keys.slice();
-                this._values = this._values.slice();
-                if (this._order)
-                    this._order = this._order.slice();
-                this._copyOnWrite = false;
-            }
-        };
-        SortedMap.prototype.writePostScript = function () {
-            this._version++;
-        };
-        SortedMap.prototype.getIterationOrder = function () {
-            if (this._order) {
-                var order_1 = this._order;
-                return this._order
-                    .map(function (_, i) { return i; })
-                    .sort(function (x, y) { return order_1[x] - order_1[y]; });
-            }
-            return undefined;
-        };
-        return SortedMap;
-    }());
-    collections.SortedMap = SortedMap;
-    function insertAt(array, index, value) {
-        if (index === 0) {
-            array.unshift(value);
-        }
-        else if (index === array.length) {
-            array.push(value);
-        }
-        else {
-            for (var i = array.length; i > index; i--) {
-                array[i] = array[i - 1];
-            }
-            array[index] = value;
-        }
-    }
-    collections.insertAt = insertAt;
-    function getIterator(iterable) {
-        return iterable[Symbol.iterator]();
-    }
-    collections.getIterator = getIterator;
-    function nextResult(iterator) {
-        var result = iterator.next();
-        return result.done ? undefined : result;
-    }
-    collections.nextResult = nextResult;
-    function closeIterator(iterator) {
-        var fn = iterator.return;
-        if (typeof fn === "function")
-            fn.call(iterator);
-    }
-    collections.closeIterator = closeIterator;
-    /**
-     * A collection of metadata that supports inheritance.
-     */
-    var Metadata = /** @class */ (function () {
-        function Metadata(parent) {
-            this._version = 0;
-            this._size = -1;
-            this._parent = parent;
-            this._map = Object.create(parent ? parent._map : null); // tslint:disable-line:no-null-keyword
-        }
-        Object.defineProperty(Metadata.prototype, "size", {
-            get: function () {
-                if (this._size === -1 || (this._parent && this._parent._version !== this._parentVersion)) {
-                    var size = 0;
-                    for (var _ in this._map)
-                        size++;
-                    this._size = size;
-                    if (this._parent) {
-                        this._parentVersion = this._parent._version;
-                    }
-                }
-                return this._size;
-            },
-            enumerable: true,
-            configurable: true
-        });
-        Object.defineProperty(Metadata.prototype, "parent", {
-            get: function () {
-                return this._parent;
-            },
-            enumerable: true,
-            configurable: true
-        });
-        Metadata.prototype.has = function (key) {
-            return this._map[Metadata._escapeKey(key)] !== undefined;
-        };
-        Metadata.prototype.get = function (key) {
-            var value = this._map[Metadata._escapeKey(key)];
-            return value === Metadata._undefinedValue ? undefined : value;
-        };
-        Metadata.prototype.set = function (key, value) {
-            this._map[Metadata._escapeKey(key)] = value === undefined ? Metadata._undefinedValue : value;
-            this._size = -1;
-            this._version++;
-            return this;
-        };
-        Metadata.prototype.delete = function (key) {
-            var escapedKey = Metadata._escapeKey(key);
-            if (this._map[escapedKey] !== undefined) {
-                delete this._map[escapedKey];
-                this._size = -1;
-                this._version++;
-                return true;
-            }
-            return false;
-        };
-        Metadata.prototype.clear = function () {
-            this._map = Object.create(this._parent ? this._parent._map : null); // tslint:disable-line:no-null-keyword
-            this._size = -1;
-            this._version++;
-        };
-        Metadata.prototype.forEach = function (callback) {
-            for (var key in this._map) {
-                callback(this._map[key], Metadata._unescapeKey(key), this);
-            }
-        };
-        Metadata._escapeKey = function (text) {
-            return (text.length >= 2 && text.charAt(0) === "_" && text.charAt(1) === "_" ? "_" + text : text);
-        };
-        Metadata._unescapeKey = function (text) {
-            return (text.length >= 3 && text.charAt(0) === "_" && text.charAt(1) === "_" && text.charAt(2) === "_" ? text.slice(1) : text);
-        };
-        Metadata._undefinedValue = {};
-        return Metadata;
-    }());
-    collections.Metadata = Metadata;
-})(collections || (collections = {}));
-/**
- * Common utilities
- */
-var utils;
-(function (utils) {
-    var testPathPrefixRegExp = /(?:(file:\/{3})|\/)\.(ts|lib|src)\//g;
-    function removeTestPathPrefixes(text, retainTrailingDirectorySeparator) {
-        return text !== undefined ? text.replace(testPathPrefixRegExp, function (_, scheme) { return scheme || (retainTrailingDirectorySeparator ? "/" : ""); }) : undefined; // TODO: GH#18217
-    }
-    utils.removeTestPathPrefixes = removeTestPathPrefixes;
-    /**
-     * Removes leading indentation from a template literal string.
-     */
-    function dedent(array) {
-        var args = [];
-        for (var _i = 1; _i < arguments.length; _i++) {
-            args[_i - 1] = arguments[_i];
-        }
-        var text = array[0];
-        for (var i = 0; i < args.length; i++) {
-            text += args[i];
-            text += array[i + 1];
-        }
-        var lineTerminatorRegExp = /\r\n?|\n/g;
-        var lines = [];
-        var lineTerminators = [];
-        var match;
-        var lineStart = 0;
-        while (match = lineTerminatorRegExp.exec(text)) {
-            if (lineStart !== match.index || lines.length > 0) {
-                lines.push(text.slice(lineStart, match.index));
-                lineTerminators.push(match[0]);
-            }
-            lineStart = match.index + match[0].length;
-        }
-        if (lineStart < text.length) {
-            lines.push(text.slice(lineStart));
-        }
-        var indentation = guessIndentation(lines);
-        var result = "";
-        for (var i = 0; i < lines.length; i++) {
-            var lineText = lines[i];
-            var line = indentation ? lineText.slice(indentation) : lineText;
-            result += line;
-            if (i < lineTerminators.length) {
-                result += lineTerminators[i];
-            }
-        }
-        return result;
-    }
-    utils.dedent = dedent;
-    function guessIndentation(lines) {
-        var indentation;
-        for (var _i = 0, lines_1 = lines; _i < lines_1.length; _i++) {
-            var line = lines_1[_i];
-            for (var i = 0; i < line.length && (indentation === undefined || i < indentation); i++) {
-                if (!ts.isWhiteSpaceLike(line.charCodeAt(i))) {
-                    if (indentation === undefined || i < indentation) {
-                        indentation = i;
-                        break;
-                    }
-                }
-            }
-        }
-        return indentation;
-    }
-    function toUtf8(text) {
-        return new Buffer(text).toString("utf8");
-    }
-    utils.toUtf8 = toUtf8;
-    function getByteOrderMarkLength(text) {
-        if (text.length >= 1) {
-            var ch0 = text.charCodeAt(0);
-            if (ch0 === 0xfeff)
-                return 1;
-            if (ch0 === 0xfe)
-                return text.length >= 2 && text.charCodeAt(1) === 0xff ? 2 : 0;
-            if (ch0 === 0xff)
-                return text.length >= 2 && text.charCodeAt(1) === 0xfe ? 2 : 0;
-            if (ch0 === 0xef)
-                return text.length >= 3 && text.charCodeAt(1) === 0xbb && text.charCodeAt(2) === 0xbf ? 3 : 0;
-        }
-        return 0;
-    }
-    utils.getByteOrderMarkLength = getByteOrderMarkLength;
-    function removeByteOrderMark(text) {
-        var length = getByteOrderMarkLength(text);
-        return length ? text.slice(length) : text;
-    }
-    utils.removeByteOrderMark = removeByteOrderMark;
-    function addUTF8ByteOrderMark(text) {
-        return getByteOrderMarkLength(text) === 0 ? "\u00EF\u00BB\u00BF" + text : text;
-    }
-    utils.addUTF8ByteOrderMark = addUTF8ByteOrderMark;
-})(utils || (utils = {}));
-// NOTE: The contents of this file are all exported from the namespace 'documents'. This is to
-//       support the eventual conversion of harness into a modular system.
-var documents;
-(function (documents) {
-    var TextDocument = /** @class */ (function () {
-        function TextDocument(file, text, meta) {
-            this.file = file;
-            this.text = text;
-            this.meta = meta || new Map();
-        }
-        Object.defineProperty(TextDocument.prototype, "lineStarts", {
-            get: function () {
-                return this._lineStarts || (this._lineStarts = ts.computeLineStarts(this.text));
-            },
-            enumerable: true,
-            configurable: true
-        });
-        TextDocument.fromTestFile = function (file) {
-            return new TextDocument(file.unitName, file.content, file.fileOptions && Object.keys(file.fileOptions)
-                .reduce(function (meta, key) { return meta.set(key, file.fileOptions[key]); }, new Map()));
-        };
-        TextDocument.prototype.asTestFile = function () {
-            return this._testFile || (this._testFile = {
-                unitName: this.file,
-                content: this.text,
-                fileOptions: Array.from(this.meta)
-                    .reduce(function (obj, _a) {
-                    var key = _a[0], value = _a[1];
-                    return (obj[key] = value, obj);
-                }, {})
-            });
-        };
-        return TextDocument;
-    }());
-    documents.TextDocument = TextDocument;
-    var SourceMap = /** @class */ (function () {
-        function SourceMap(mapFile, data) {
-            this.sources = [];
-            this.mappings = [];
-            this._emittedLineMappings = [];
-            this._sourceLineMappings = [];
-            this.raw = typeof data === "string" ? JSON.parse(data) : data;
-            this.mapFile = mapFile;
-            this.version = this.raw.version;
-            this.file = this.raw.file;
-            this.sourceRoot = this.raw.sourceRoot;
-            this.sources = this.raw.sources;
-            this.sourcesContent = this.raw.sourcesContent;
-            this.names = this.raw.names;
-            // populate mappings
-            var mappings = [];
-            var emittedLine = 0;
-            var emittedColumn = 0;
-            var sourceIndex = 0;
-            var sourceLine = 0;
-            var sourceColumn = 0;
-            var nameIndex = 0;
-            var match;
-            while (match = SourceMap._mappingRegExp.exec(this.raw.mappings)) {
-                if (match[1]) {
-                    var segment = SourceMap._decodeVLQ(match[1]);
-                    if (segment.length !== 1 && segment.length !== 4 && segment.length !== 5) {
-                        throw new Error("Invalid VLQ");
-                    }
-                    emittedColumn += segment[0];
-                    if (segment.length >= 4) {
-                        sourceIndex += segment[1];
-                        sourceLine += segment[2];
-                        sourceColumn += segment[3];
-                    }
-                    var mapping = { mappingIndex: mappings.length, emittedLine: emittedLine, emittedColumn: emittedColumn, sourceIndex: sourceIndex, sourceLine: sourceLine, sourceColumn: sourceColumn };
-                    if (segment.length === 5) {
-                        nameIndex += segment[4];
-                        mapping.nameIndex = nameIndex;
-                    }
-                    mappings.push(mapping);
-                    var mappingsForEmittedLine = this._emittedLineMappings[mapping.emittedLine] || (this._emittedLineMappings[mapping.emittedLine] = []);
-                    mappingsForEmittedLine.push(mapping);
-                    var mappingsForSource = this._sourceLineMappings[mapping.sourceIndex] || (this._sourceLineMappings[mapping.sourceIndex] = []);
-                    var mappingsForSourceLine = mappingsForSource[mapping.sourceLine] || (mappingsForSource[mapping.sourceLine] = []);
-                    mappingsForSourceLine.push(mapping);
-                }
-                else if (match[2]) {
-                    emittedLine++;
-                    emittedColumn = 0;
-                }
-                else {
-                    throw new Error("Unrecognized character '" + match[0] + "'.");
-                }
-            }
-            this.mappings = mappings;
-        }
-        SourceMap.getUrl = function (text) {
-            var match;
-            var lastMatch;
-            while (match = SourceMap._sourceMappingURLRegExp.exec(text)) {
-                lastMatch = match;
-            }
-            return lastMatch ? lastMatch[1] : undefined;
-        };
-        SourceMap.fromUrl = function (url) {
-            var match = SourceMap._dataURLRegExp.exec(url);
-            return match ? new SourceMap(/*mapFile*/ undefined, new Buffer(match[1], "base64").toString("utf8")) : undefined;
-        };
-        SourceMap.fromSource = function (text) {
-            var url = this.getUrl(text);
-            return url === undefined ? undefined : this.fromUrl(url);
-        };
-        SourceMap.prototype.getMappingsForEmittedLine = function (emittedLine) {
-            return this._emittedLineMappings[emittedLine];
-        };
-        SourceMap.prototype.getMappingsForSourceLine = function (sourceIndex, sourceLine) {
-            var mappingsForSource = this._sourceLineMappings[sourceIndex];
-            return mappingsForSource && mappingsForSource[sourceLine];
-        };
-        SourceMap._decodeVLQ = function (text) {
-            var vlq = [];
-            var shift = 0;
-            var value = 0;
-            for (var i = 0; i < text.length; i++) {
-                var currentByte = SourceMap._base64Chars.indexOf(text.charAt(i));
-                value += (currentByte & 31) << shift;
-                if ((currentByte & 32) === 0) {
-                    vlq.push(value & 1 ? -(value >>> 1) : value >>> 1);
-                    shift = 0;
-                    value = 0;
-                }
-                else {
-                    shift += 5;
-                }
-            }
-            return vlq;
-        };
-        SourceMap._mappingRegExp = /([A-Za-z0-9+/]+),?|(;)|./g;
-        SourceMap._sourceMappingURLRegExp = /^\/\/[#@]\s*sourceMappingURL\s*=\s*(.*?)\s*$/mig;
-        SourceMap._dataURLRegExp = /^data:application\/json;base64,([a-z0-9+/=]+)$/i;
-        SourceMap._base64Chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
-        return SourceMap;
-    }());
-    documents.SourceMap = SourceMap;
-})(documents || (documents = {}));
-var vpath;
-(function (vpath) {
-    vpath.sep = ts.directorySeparator;
-    vpath.normalizeSeparators = ts.normalizeSlashes;
-    vpath.isAbsolute = ts.isRootedDiskPath;
-    vpath.isRoot = ts.isDiskPathRoot;
-    vpath.hasTrailingSeparator = ts.hasTrailingDirectorySeparator;
-    vpath.addTrailingSeparator = ts.ensureTrailingDirectorySeparator;
-    vpath.removeTrailingSeparator = ts.removeTrailingDirectorySeparator;
-    vpath.normalize = ts.normalizePath;
-    vpath.combine = ts.combinePaths;
-    vpath.parse = ts.getPathComponents;
-    vpath.reduce = ts.reducePathComponents;
-    vpath.format = ts.getPathFromPathComponents;
-    vpath.resolve = ts.resolvePath;
-    vpath.compare = ts.comparePaths;
-    vpath.compareCaseSensitive = ts.comparePathsCaseSensitive;
-    vpath.compareCaseInsensitive = ts.comparePathsCaseInsensitive;
-    vpath.dirname = ts.getDirectoryPath;
-    vpath.basename = ts.getBaseFileName;
-    vpath.extname = ts.getAnyExtensionFromPath;
-    vpath.relative = ts.getRelativePathFromDirectory;
-    vpath.beneath = ts.containsPath;
-    vpath.changeExtension = ts.changeAnyExtension;
-    vpath.isTypeScript = ts.hasTypeScriptFileExtension;
-    vpath.isJavaScript = ts.hasJavaScriptFileExtension;
-    var invalidRootComponentRegExp = /^(?!(\/|\/\/\w+\/|[a-zA-Z]:\/?|)$)/;
-    var invalidNavigableComponentRegExp = /[:*?"<>|]/;
-    var invalidNavigableComponentWithWildcardsRegExp = /[:"<>|]/;
-    var invalidNonNavigableComponentRegExp = /^\.{1,2}$|[:*?"<>|]/;
-    var invalidNonNavigableComponentWithWildcardsRegExp = /^\.{1,2}$|[:"<>|]/;
-    var extRegExp = /\.\w+$/;
-    var ValidationFlags;
-    (function (ValidationFlags) {
-        ValidationFlags[ValidationFlags["None"] = 0] = "None";
-        ValidationFlags[ValidationFlags["RequireRoot"] = 1] = "RequireRoot";
-        ValidationFlags[ValidationFlags["RequireDirname"] = 2] = "RequireDirname";
-        ValidationFlags[ValidationFlags["RequireBasename"] = 4] = "RequireBasename";
-        ValidationFlags[ValidationFlags["RequireExtname"] = 8] = "RequireExtname";
-        ValidationFlags[ValidationFlags["RequireTrailingSeparator"] = 16] = "RequireTrailingSeparator";
-        ValidationFlags[ValidationFlags["AllowRoot"] = 32] = "AllowRoot";
-        ValidationFlags[ValidationFlags["AllowDirname"] = 64] = "AllowDirname";
-        ValidationFlags[ValidationFlags["AllowBasename"] = 128] = "AllowBasename";
-        ValidationFlags[ValidationFlags["AllowExtname"] = 256] = "AllowExtname";
-        ValidationFlags[ValidationFlags["AllowTrailingSeparator"] = 512] = "AllowTrailingSeparator";
-        ValidationFlags[ValidationFlags["AllowNavigation"] = 1024] = "AllowNavigation";
-        ValidationFlags[ValidationFlags["AllowWildcard"] = 2048] = "AllowWildcard";
-        /** Path must be a valid directory root */
-        ValidationFlags[ValidationFlags["Root"] = 545] = "Root";
-        /** Path must be a absolute */
-        ValidationFlags[ValidationFlags["Absolute"] = 2017] = "Absolute";
-        /** Path may be relative or absolute */
-        ValidationFlags[ValidationFlags["RelativeOrAbsolute"] = 2016] = "RelativeOrAbsolute";
-        /** Path may only be a filename */
-        ValidationFlags[ValidationFlags["Basename"] = 260] = "Basename";
-    })(ValidationFlags = vpath.ValidationFlags || (vpath.ValidationFlags = {}));
-    function validateComponents(components, flags, hasTrailingSeparator) {
-        var hasRoot = !!components[0];
-        var hasDirname = components.length > 2;
-        var hasBasename = components.length > 1;
-        var hasExtname = hasBasename && extRegExp.test(components[components.length - 1]);
-        var invalidComponentRegExp = flags & 1024 /* AllowNavigation */
-            ? flags & 2048 /* AllowWildcard */ ? invalidNavigableComponentWithWildcardsRegExp : invalidNavigableComponentRegExp
-            : flags & 2048 /* AllowWildcard */ ? invalidNonNavigableComponentWithWildcardsRegExp : invalidNonNavigableComponentRegExp;
-        // Validate required components
-        if (flags & 1 /* RequireRoot */ && !hasRoot)
-            return false;
-        if (flags & 2 /* RequireDirname */ && !hasDirname)
-            return false;
-        if (flags & 4 /* RequireBasename */ && !hasBasename)
-            return false;
-        if (flags & 8 /* RequireExtname */ && !hasExtname)
-            return false;
-        if (flags & 16 /* RequireTrailingSeparator */ && !hasTrailingSeparator)
-            return false;
-        // Required components indicate allowed components
-        if (flags & 1 /* RequireRoot */)
-            flags |= 32 /* AllowRoot */;
-        if (flags & 2 /* RequireDirname */)
-            flags |= 64 /* AllowDirname */;
-        if (flags & 4 /* RequireBasename */)
-            flags |= 128 /* AllowBasename */;
-        if (flags & 8 /* RequireExtname */)
-            flags |= 256 /* AllowExtname */;
-        if (flags & 16 /* RequireTrailingSeparator */)
-            flags |= 512 /* AllowTrailingSeparator */;
-        // Validate disallowed components
-        if (~flags & 32 /* AllowRoot */ && hasRoot)
-            return false;
-        if (~flags & 64 /* AllowDirname */ && hasDirname)
-            return false;
-        if (~flags & 128 /* AllowBasename */ && hasBasename)
-            return false;
-        if (~flags & 256 /* AllowExtname */ && hasExtname)
-            return false;
-        if (~flags & 512 /* AllowTrailingSeparator */ && hasTrailingSeparator)
-            return false;
-        // Validate component strings
-        if (invalidRootComponentRegExp.test(components[0]))
-            return false;
-        for (var i = 1; i < components.length; i++) {
-            if (invalidComponentRegExp.test(components[i]))
-                return false;
-        }
-        return true;
-    }
-    function validate(path, flags) {
-        if (flags === void 0) { flags = 2016 /* RelativeOrAbsolute */; }
-        var components = vpath.parse(path);
-        var trailing = vpath.hasTrailingSeparator(path);
-        if (!validateComponents(components, flags, trailing))
-            throw vfs.createIOError("ENOENT");
-        return components.length > 1 && trailing ? vpath.format(vpath.reduce(components)) + vpath.sep : vpath.format(vpath.reduce(components));
-    }
-    vpath.validate = validate;
-    function isDeclaration(path) {
-        return vpath.extname(path, ".d.ts", /*ignoreCase*/ false).length > 0;
-    }
-    vpath.isDeclaration = isDeclaration;
-    function isSourceMap(path) {
-        return vpath.extname(path, ".map", /*ignoreCase*/ false).length > 0;
-    }
-    vpath.isSourceMap = isSourceMap;
-    var javaScriptSourceMapExtensions = [".js.map", ".jsx.map"];
-    function isJavaScriptSourceMap(path) {
-        return vpath.extname(path, javaScriptSourceMapExtensions, /*ignoreCase*/ false).length > 0;
-    }
-    vpath.isJavaScriptSourceMap = isJavaScriptSourceMap;
-    function isJson(path) {
-        return vpath.extname(path, ".json", /*ignoreCase*/ false).length > 0;
-    }
-    vpath.isJson = isJson;
-    function isDefaultLibrary(path) {
-        return isDeclaration(path)
-            && vpath.basename(path).startsWith("lib.");
-    }
-    vpath.isDefaultLibrary = isDefaultLibrary;
-    function isTsConfigFile(path) {
-        return path.indexOf("tsconfig") !== -1 && path.indexOf("json") !== -1;
-    }
-    vpath.isTsConfigFile = isTsConfigFile;
-})(vpath || (vpath = {}));
-// tslint:disable:no-null-keyword
-var vfs;
-(function (vfs) {
-    /**
-     * Posix-style path to the TypeScript compiler build outputs (including tsc.js, lib.d.ts, etc.)
-     */
-    vfs.builtFolder = "/.ts";
-    /**
-     * Posix-style path to additional mountable folders (./tests/projects in this repo)
-     */
-    vfs.projectsFolder = "/.projects";
-    /**
-     * Posix-style path to additional test libraries
-     */
-    vfs.testLibFolder = "/.lib";
-    /**
-     * Posix-style path to sources under test
-     */
-    vfs.srcFolder = "/.src";
-    // file type
-    var S_IFMT = 61440; // file type
-    var S_IFSOCK = 49152; // socket
-    var S_IFLNK = 40960; // symbolic link
-    var S_IFREG = 32768; // regular file
-    var S_IFBLK = 24576; // block device
-    var S_IFDIR = 16384; // directory
-    var S_IFCHR = 8192; // character device
-    var S_IFIFO = 4096; // FIFO
-    var devCount = 0; // A monotonically increasing count of device ids
-    var inoCount = 0; // A monotonically increasing count of inodes
-    /**
-     * Represents a virtual POSIX-like file system.
-     */
-    var FileSystem = /** @class */ (function () {
-        function FileSystem(ignoreCase, options) {
-            if (options === void 0) { options = {}; }
-            // lazy-initialized state that should be mutable even if the FileSystem is frozen.
-            this._lazy = {};
-            var _a = options.time, time = _a === void 0 ? -1 : _a, files = options.files, meta = options.meta;
-            this.ignoreCase = ignoreCase;
-            this.stringComparer = this.ignoreCase ? vpath.compareCaseInsensitive : vpath.compareCaseSensitive;
-            this._time = time;
-            if (meta) {
-                for (var _i = 0, _b = Object.keys(meta); _i < _b.length; _i++) {
-                    var key = _b[_i];
-                    this.meta.set(key, meta[key]);
-                }
-            }
-            if (files) {
-                this._applyFiles(files, /*dirname*/ "");
-            }
-            var cwd = options.cwd;
-            if ((!cwd || !vpath.isRoot(cwd)) && this._lazy.links) {
-                var iterator = collections.getIterator(this._lazy.links.keys());
-                try {
-                    for (var i = collections.nextResult(iterator); i; i = collections.nextResult(iterator)) {
-                        var name = i.value;
-                        cwd = cwd ? vpath.resolve(name, cwd) : name;
-                        break;
-                    }
-                }
-                finally {
-                    collections.closeIterator(iterator);
-                }
-            }
-            if (cwd) {
-                vpath.validate(cwd, 2017 /* Absolute */);
-                this.mkdirpSync(cwd);
-            }
-            this._cwd = cwd || "";
-        }
-        Object.defineProperty(FileSystem.prototype, "meta", {
-            /**
-             * Gets metadata for this `FileSystem`.
-             */
-            get: function () {
-                if (!this._lazy.meta) {
-                    this._lazy.meta = new collections.Metadata(this._shadowRoot ? this._shadowRoot.meta : undefined);
-                }
-                return this._lazy.meta;
-            },
-            enumerable: true,
-            configurable: true
-        });
-        Object.defineProperty(FileSystem.prototype, "isReadonly", {
-            /**
-             * Gets a value indicating whether the file system is read-only.
-             */
-            get: function () {
-                return Object.isFrozen(this);
-            },
-            enumerable: true,
-            configurable: true
-        });
-        /**
-         * Makes the file system read-only.
-         */
-        FileSystem.prototype.makeReadonly = function () {
-            Object.freeze(this);
-            return this;
-        };
-        Object.defineProperty(FileSystem.prototype, "shadowRoot", {
-            /**
-             * Gets the file system shadowed by this file system.
-             */
-            get: function () {
-                return this._shadowRoot;
-            },
-            enumerable: true,
-            configurable: true
-        });
-        /**
-         * Gets a shadow copy of this file system. Changes to the shadow copy do not affect the
-         * original, allowing multiple copies of the same core file system without multiple copies
-         * of the same data.
-         */
-        FileSystem.prototype.shadow = function (ignoreCase) {
-            if (ignoreCase === void 0) { ignoreCase = this.ignoreCase; }
-            if (!this.isReadonly)
-                throw new Error("Cannot shadow a mutable file system.");
-            if (ignoreCase && !this.ignoreCase)
-                throw new Error("Cannot create a case-insensitive file system from a case-sensitive one.");
-            var fs = new FileSystem(ignoreCase, { time: this._time });
-            fs._shadowRoot = this;
-            fs._cwd = this._cwd;
-            return fs;
-        };
-        /**
-         * Gets or sets the timestamp (in milliseconds) used for file status, returning the previous timestamp.
-         *
-         * @link http://pubs.opengroup.org/onlinepubs/9699919799/functions/time.html
-         */
-        FileSystem.prototype.time = function (value) {
-            if (value !== undefined && this.isReadonly)
-                throw createIOError("EPERM");
-            var result = this._time;
-            if (typeof result === "function")
-                result = result();
-            if (typeof result === "object")
-                result = result.getTime();
-            if (result === -1)
-                result = Date.now();
-            if (value !== undefined) {
-                this._time = value;
-            }
-            return result;
-        };
-        /**
-         * Gets the metadata object for a path.
-         * @param path
-         */
-        FileSystem.prototype.filemeta = function (path) {
-            var node = this._walk(this._resolve(path)).node;
-            if (!node)
-                throw createIOError("ENOENT");
-            return this._filemeta(node);
-        };
-        FileSystem.prototype._filemeta = function (node) {
-            if (!node.meta) {
-                var parentMeta = node.shadowRoot && this._shadowRoot && this._shadowRoot._filemeta(node.shadowRoot);
-                node.meta = new collections.Metadata(parentMeta);
-            }
-            return node.meta;
-        };
-        /**
-         * Get the pathname of the current working directory.
-         *
-         * @link - http://pubs.opengroup.org/onlinepubs/9699919799/functions/getcwd.html
-         */
-        FileSystem.prototype.cwd = function () {
-            if (!this._cwd)
-                throw new Error("The current working directory has not been set.");
-            var node = this._walk(this._cwd).node;
-            if (!node)
-                throw createIOError("ENOENT");
-            if (!isDirectory(node))
-                throw createIOError("ENOTDIR");
-            return this._cwd;
-        };
-        /**
-         * Changes the current working directory.
-         *
-         * @link http://pubs.opengroup.org/onlinepubs/9699919799/functions/chdir.html
-         */
-        FileSystem.prototype.chdir = function (path) {
-            if (this.isReadonly)
-                throw createIOError("EPERM");
-            path = this._resolve(path);
-            var node = this._walk(path).node;
-            if (!node)
-                throw createIOError("ENOENT");
-            if (!isDirectory(node))
-                throw createIOError("ENOTDIR");
-            this._cwd = path;
-        };
-        /**
-         * Pushes the current directory onto the directory stack and changes the current working directory to the supplied path.
-         */
-        FileSystem.prototype.pushd = function (path) {
-            if (this.isReadonly)
-                throw createIOError("EPERM");
-            if (path)
-                path = this._resolve(path);
-            if (this._cwd) {
-                if (!this._dirStack)
-                    this._dirStack = [];
-                this._dirStack.push(this._cwd);
-            }
-            if (path && path !== this._cwd) {
-                this.chdir(path);
-            }
-        };
-        /**
-         * Pops the previous directory from the location stack and changes the current directory to that directory.
-         */
-        FileSystem.prototype.popd = function () {
-            if (this.isReadonly)
-                throw createIOError("EPERM");
-            var path = this._dirStack && this._dirStack.pop();
-            if (path) {
-                this.chdir(path);
-            }
-        };
-        /**
-         * Update the file system with a set of files.
-         */
-        FileSystem.prototype.apply = function (files) {
-            this._applyFiles(files, this._cwd);
-        };
-        /**
-         * Scan file system entries along a path. If `path` is a symbolic link, it is dereferenced.
-         * @param path The path at which to start the scan.
-         * @param axis The axis along which to traverse.
-         * @param traversal The traversal scheme to use.
-         */
-        FileSystem.prototype.scanSync = function (path, axis, traversal) {
-            path = this._resolve(path);
-            var results = [];
-            this._scan(path, this._stat(this._walk(path)), axis, traversal, /*noFollow*/ false, results);
-            return results;
-        };
-        /**
-         * Scan file system entries along a path.
-         * @param path The path at which to start the scan.
-         * @param axis The axis along which to traverse.
-         * @param traversal The traversal scheme to use.
-         */
-        FileSystem.prototype.lscanSync = function (path, axis, traversal) {
-            path = this._resolve(path);
-            var results = [];
-            this._scan(path, this._stat(this._walk(path, /*noFollow*/ true)), axis, traversal, /*noFollow*/ true, results);
-            return results;
-        };
-        FileSystem.prototype._scan = function (path, stats, axis, traversal, noFollow, results) {
-            if (axis === "ancestors-or-self" || axis === "self" || axis === "descendants-or-self") {
-                if (!traversal.accept || traversal.accept(path, stats)) {
-                    results.push(path);
-                }
-            }
-            if (axis === "ancestors-or-self" || axis === "ancestors") {
-                var dirname = vpath.dirname(path);
-                if (dirname !== path) {
-                    try {
-                        var stats_1 = this._stat(this._walk(dirname, noFollow));
-                        if (!traversal.traverse || traversal.traverse(dirname, stats_1)) {
-                            this._scan(dirname, stats_1, "ancestors-or-self", traversal, noFollow, results);
-                        }
-                    }
-                    catch ( /*ignored*/_a) { /*ignored*/ }
-                }
-            }
-            if (axis === "descendants-or-self" || axis === "descendants") {
-                if (stats.isDirectory() && (!traversal.traverse || traversal.traverse(path, stats))) {
-                    for (var _i = 0, _b = this.readdirSync(path); _i < _b.length; _i++) {
-                        var file = _b[_i];
-                        try {
-                            var childpath = vpath.combine(path, file);
-                            var stats_2 = this._stat(this._walk(childpath, noFollow));
-                            this._scan(childpath, stats_2, "descendants-or-self", traversal, noFollow, results);
-                        }
-                        catch ( /*ignored*/_c) { /*ignored*/ }
-                    }
-                }
-            }
-        };
-        /**
-         * Mounts a physical or virtual file system at a location in this virtual file system.
-         *
-         * @param source The path in the physical (or other virtual) file system.
-         * @param target The path in this virtual file system.
-         * @param resolver An object used to resolve files in `source`.
-         */
-        FileSystem.prototype.mountSync = function (source, target, resolver) {
-            if (this.isReadonly)
-                throw createIOError("EROFS");
-            source = vpath.validate(source, 2017 /* Absolute */);
-            var _a = this._walk(this._resolve(target), /*noFollow*/ true), parent = _a.parent, links = _a.links, existingNode = _a.node, basename = _a.basename;
-            if (existingNode)
-                throw createIOError("EEXIST");
-            var time = this.time();
-            var node = this._mknod(parent ? parent.dev : ++devCount, S_IFDIR, /*mode*/ 511, time);
-            node.source = source;
-            node.resolver = resolver;
-            this._addLink(parent, links, basename, node, time);
-        };
-        /**
-         * Recursively remove all files and directories underneath the provided path.
-         */
-        FileSystem.prototype.rimrafSync = function (path) {
-            try {
-                var stats = this.lstatSync(path);
-                if (stats.isFile() || stats.isSymbolicLink()) {
-                    this.unlinkSync(path);
-                }
-                else if (stats.isDirectory()) {
-                    for (var _i = 0, _a = this.readdirSync(path); _i < _a.length; _i++) {
-                        var file = _a[_i];
-                        this.rimrafSync(vpath.combine(path, file));
-                    }
-                    this.rmdirSync(path);
-                }
-            }
-            catch (e) {
-                if (e.code === "ENOENT")
-                    return;
-                throw e;
-            }
-        };
-        /**
-         * Make a directory and all of its parent paths (if they don't exist).
-         */
-        FileSystem.prototype.mkdirpSync = function (path) {
-            var _this = this;
-            path = this._resolve(path);
-            var result = this._walk(path, /*noFollow*/ true, function (error, result) {
-                if (error.code === "ENOENT") {
-                    _this._mkdir(result);
-                    return "retry";
-                }
-                return "throw";
-            });
-            if (!result.node)
-                this._mkdir(result);
-        };
-        FileSystem.prototype.getFileListing = function () {
-            var _this = this;
-            var result = "";
-            var printLinks = function (dirname, links) {
-                var iterator = collections.getIterator(links);
-                try {
-                    for (var i = collections.nextResult(iterator); i; i = collections.nextResult(iterator)) {
-                        var _a = i.value, name = _a[0], node = _a[1];
-                        var path = dirname ? vpath.combine(dirname, name) : name;
-                        var marker = vpath.compare(_this._cwd, path, _this.ignoreCase) === 0 ? "*" : " ";
-                        if (result)
-                            result += "\n";
-                        result += marker;
-                        if (isDirectory(node)) {
-                            result += vpath.addTrailingSeparator(path);
-                            printLinks(path, _this._getLinks(node));
-                        }
-                        else if (isFile(node)) {
-                            result += path;
-                        }
-                        else if (isSymlink(node)) {
-                            result += path + " -> " + node.symlink;
-                        }
-                    }
-                }
-                finally {
-                    collections.closeIterator(iterator);
-                }
-            };
-            printLinks(/*dirname*/ undefined, this._getRootLinks());
-            return result;
-        };
-        /**
-         * Print diagnostic information about the structure of the file system to the console.
-         */
-        FileSystem.prototype.debugPrint = function () {
-            console.log(this.getFileListing());
-        };
-        // POSIX API (aligns with NodeJS "fs" module API)
-        /**
-         * Determines whether a path exists.
-         */
-        FileSystem.prototype.existsSync = function (path) {
-            var result = this._walk(this._resolve(path), /*noFollow*/ true, function () { return "stop"; });
-            return result !== undefined && result.node !== undefined;
-        };
-        /**
-         * Get file status. If `path` is a symbolic link, it is dereferenced.
-         *
-         * @link http://pubs.opengroup.org/onlinepubs/9699919799/functions/stat.html
-         *
-         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
-         */
-        FileSystem.prototype.statSync = function (path) {
-            return this._stat(this._walk(this._resolve(path)));
-        };
-        /**
-         * Change file access times
-         *
-         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
-         */
-        FileSystem.prototype.utimesSync = function (path, atime, mtime) {
-            if (this.isReadonly)
-                throw createIOError("EROFS");
-            if (!isFinite(+atime) || !isFinite(+mtime))
-                throw createIOError("EINVAL");
-            var entry = this._walk(this._resolve(path));
-            if (!entry || !entry.node) {
-                throw createIOError("ENOENT");
-            }
-            entry.node.atimeMs = +atime;
-            entry.node.mtimeMs = +mtime;
-            entry.node.ctimeMs = this.time();
-        };
-        /**
-         * Get file status. If `path` is a symbolic link, it is dereferenced.
-         *
-         * @link http://pubs.opengroup.org/onlinepubs/9699919799/functions/lstat.html
-         *
-         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
-         */
-        FileSystem.prototype.lstatSync = function (path) {
-            return this._stat(this._walk(this._resolve(path), /*noFollow*/ true));
-        };
-        FileSystem.prototype._stat = function (entry) {
-            var node = entry.node;
-            if (!node)
-                throw createIOError("ENOENT", entry.realpath);
-            return new Stats(node.dev, node.ino, node.mode, node.nlink, 
-            /*rdev*/ 0, 
-            /*size*/ isFile(node) ? this._getSize(node) : isSymlink(node) ? node.symlink.length : 0, 
-            /*blksize*/ 4096, 
-            /*blocks*/ 0, node.atimeMs, node.mtimeMs, node.ctimeMs, node.birthtimeMs);
-        };
-        /**
-         * Read a directory. If `path` is a symbolic link, it is dereferenced.
-         *
-         * @link http://pubs.opengroup.org/onlinepubs/9699919799/functions/readdir.html
-         *
-         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
-         */
-        FileSystem.prototype.readdirSync = function (path) {
-            var node = this._walk(this._resolve(path)).node;
-            if (!node)
-                throw createIOError("ENOENT");
-            if (!isDirectory(node))
-                throw createIOError("ENOTDIR");
-            return Array.from(this._getLinks(node).keys());
-        };
-        /**
-         * Make a directory.
-         *
-         * @link http://pubs.opengroup.org/onlinepubs/9699919799/functions/mkdir.html
-         *
-         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
-         */
-        FileSystem.prototype.mkdirSync = function (path) {
-            if (this.isReadonly)
-                throw createIOError("EROFS");
-            this._mkdir(this._walk(this._resolve(path), /*noFollow*/ true));
-        };
-        FileSystem.prototype._mkdir = function (_a) {
-            var parent = _a.parent, links = _a.links, existingNode = _a.node, basename = _a.basename;
-            if (existingNode)
-                throw createIOError("EEXIST");
-            var time = this.time();
-            var node = this._mknod(parent ? parent.dev : ++devCount, S_IFDIR, /*mode*/ 511, time);
-            this._addLink(parent, links, basename, node, time);
-        };
-        /**
-         * Remove a directory.
-         *
-         * @link http://pubs.opengroup.org/onlinepubs/9699919799/functions/rmdir.html
-         *
-         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
-         */
-        FileSystem.prototype.rmdirSync = function (path) {
-            if (this.isReadonly)
-                throw createIOError("EROFS");
-            path = this._resolve(path);
-            var _a = this._walk(path, /*noFollow*/ true), parent = _a.parent, links = _a.links, node = _a.node, basename = _a.basename;
-            if (!parent)
-                throw createIOError("EPERM");
-            if (!isDirectory(node))
-                throw createIOError("ENOTDIR");
-            if (this._getLinks(node).size !== 0)
-                throw createIOError("ENOTEMPTY");
-            this._removeLink(parent, links, basename, node);
-        };
-        /**
-         * Link one file to another file (also known as a "hard link").
-         *
-         * @link http://pubs.opengroup.org/onlinepubs/9699919799/functions/link.html
-         *
-         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
-         */
-        FileSystem.prototype.linkSync = function (oldpath, newpath) {
-            if (this.isReadonly)
-                throw createIOError("EROFS");
-            var node = this._walk(this._resolve(oldpath)).node;
-            if (!node)
-                throw createIOError("ENOENT");
-            if (isDirectory(node))
-                throw createIOError("EPERM");
-            var _a = this._walk(this._resolve(newpath), /*noFollow*/ true), parent = _a.parent, links = _a.links, basename = _a.basename, existingNode = _a.node;
-            if (!parent)
-                throw createIOError("EPERM");
-            if (existingNode)
-                throw createIOError("EEXIST");
-            this._addLink(parent, links, basename, node);
-        };
-        /**
-         * Remove a directory entry.
-         *
-         * @link http://pubs.opengroup.org/onlinepubs/9699919799/functions/unlink.html
-         *
-         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
-         */
-        FileSystem.prototype.unlinkSync = function (path) {
-            if (this.isReadonly)
-                throw createIOError("EROFS");
-            var _a = this._walk(this._resolve(path), /*noFollow*/ true), parent = _a.parent, links = _a.links, node = _a.node, basename = _a.basename;
-            if (!parent)
-                throw createIOError("EPERM");
-            if (!node)
-                throw createIOError("ENOENT");
-            if (isDirectory(node))
-                throw createIOError("EISDIR");
-            this._removeLink(parent, links, basename, node);
-        };
-        /**
-         * Rename a file.
-         *
-         * @link http://pubs.opengroup.org/onlinepubs/9699919799/functions/rename.html
-         *
-         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
-         */
-        FileSystem.prototype.renameSync = function (oldpath, newpath) {
-            if (this.isReadonly)
-                throw createIOError("EROFS");
-            var _a = this._walk(this._resolve(oldpath), /*noFollow*/ true), oldParent = _a.parent, oldParentLinks = _a.links, node = _a.node, oldBasename = _a.basename;
-            if (!oldParent)
-                throw createIOError("EPERM");
-            if (!node)
-                throw createIOError("ENOENT");
-            var _b = this._walk(this._resolve(newpath), /*noFollow*/ true), newParent = _b.parent, newParentLinks = _b.links, existingNode = _b.node, newBasename = _b.basename;
-            if (!newParent)
-                throw createIOError("EPERM");
-            var time = this.time();
-            if (existingNode) {
-                if (isDirectory(node)) {
-                    if (!isDirectory(existingNode))
-                        throw createIOError("ENOTDIR");
-                    if (this._getLinks(existingNode).size > 0)
-                        throw createIOError("ENOTEMPTY");
-                }
-                else {
-                    if (isDirectory(existingNode))
-                        throw createIOError("EISDIR");
-                }
-                this._removeLink(newParent, newParentLinks, newBasename, existingNode, time);
-            }
-            this._replaceLink(oldParent, oldParentLinks, oldBasename, newParent, newParentLinks, newBasename, node, time);
-        };
-        /**
-         * Make a symbolic link.
-         *
-         * @link http://pubs.opengroup.org/onlinepubs/9699919799/functions/symlink.html
-         *
-         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
-         */
-        FileSystem.prototype.symlinkSync = function (target, linkpath) {
-            if (this.isReadonly)
-                throw createIOError("EROFS");
-            var _a = this._walk(this._resolve(linkpath), /*noFollow*/ true), parent = _a.parent, links = _a.links, existingNode = _a.node, basename = _a.basename;
-            if (!parent)
-                throw createIOError("EPERM");
-            if (existingNode)
-                throw createIOError("EEXIST");
-            var time = this.time();
-            var node = this._mknod(parent.dev, S_IFLNK, /*mode*/ 438, time);
-            node.symlink = vpath.validate(target, 2016 /* RelativeOrAbsolute */);
-            this._addLink(parent, links, basename, node, time);
-        };
-        /**
-         * Resolve a pathname.
-         *
-         * @link http://pubs.opengroup.org/onlinepubs/9699919799/functions/realpath.html
-         *
-         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
-         */
-        FileSystem.prototype.realpathSync = function (path) {
-            var realpath = this._walk(this._resolve(path)).realpath;
-            return realpath;
-        };
-        FileSystem.prototype.readFileSync = function (path, encoding) {
-            if (encoding === void 0) { encoding = null; }
-            var node = this._walk(this._resolve(path)).node;
-            if (!node)
-                throw createIOError("ENOENT");
-            if (isDirectory(node))
-                throw createIOError("EISDIR");
-            if (!isFile(node))
-                throw createIOError("EBADF");
-            var buffer = this._getBuffer(node).slice();
-            return encoding ? buffer.toString(encoding) : buffer;
-        };
-        /**
-         * Write to a file.
-         *
-         * NOTE: do not rename this method as it is intended to align with the same named export of the "fs" module.
-         */
-        FileSystem.prototype.writeFileSync = function (path, data, encoding) {
-            if (encoding === void 0) { encoding = null; }
-            if (this.isReadonly)
-                throw createIOError("EROFS");
-            var _a = this._walk(this._resolve(path), /*noFollow*/ false), parent = _a.parent, links = _a.links, existingNode = _a.node, basename = _a.basename;
-            if (!parent)
-                throw createIOError("EPERM");
-            var time = this.time();
-            var node = existingNode;
-            if (!node) {
-                node = this._mknod(parent.dev, S_IFREG, 438, time);
-                this._addLink(parent, links, basename, node, time);
-            }
-            if (isDirectory(node))
-                throw createIOError("EISDIR");
-            if (!isFile(node))
-                throw createIOError("EBADF");
-            node.buffer = Buffer.isBuffer(data) ? data.slice() : Buffer.from("" + data, encoding || "utf8");
-            node.size = node.buffer.byteLength;
-            node.mtimeMs = time;
-            node.ctimeMs = time;
-        };
-        FileSystem.prototype._mknod = function (dev, type, mode, time) {
-            if (time === void 0) { time = this.time(); }
-            return {
-                dev: dev,
-                ino: ++inoCount,
-                mode: (mode & ~S_IFMT & ~18 & 4095) | (type & S_IFMT),
-                atimeMs: time,
-                mtimeMs: time,
-                ctimeMs: time,
-                birthtimeMs: time,
-                nlink: 0
-            };
-        };
-        FileSystem.prototype._addLink = function (parent, links, name, node, time) {
-            if (time === void 0) { time = this.time(); }
-            links.set(name, node);
-            node.nlink++;
-            node.ctimeMs = time;
-            if (parent)
-                parent.mtimeMs = time;
-            if (!parent && !this._cwd)
-                this._cwd = name;
-        };
-        FileSystem.prototype._removeLink = function (parent, links, name, node, time) {
-            if (time === void 0) { time = this.time(); }
-            links.delete(name);
-            node.nlink--;
-            node.ctimeMs = time;
-            if (parent)
-                parent.mtimeMs = time;
-        };
-        FileSystem.prototype._replaceLink = function (oldParent, oldLinks, oldName, newParent, newLinks, newName, node, time) {
-            if (oldParent !== newParent) {
-                this._removeLink(oldParent, oldLinks, oldName, node, time);
-                this._addLink(newParent, newLinks, newName, node, time);
-            }
-            else {
-                oldLinks.delete(oldName);
-                oldLinks.set(newName, node);
-                oldParent.mtimeMs = time;
-                newParent.mtimeMs = time;
-            }
-        };
-        FileSystem.prototype._getRootLinks = function () {
-            if (!this._lazy.links) {
-                this._lazy.links = new collections.SortedMap(this.stringComparer);
-                if (this._shadowRoot) {
-                    this._copyShadowLinks(this._shadowRoot._getRootLinks(), this._lazy.links);
-                }
-                this._lazy.links = this._lazy.links;
-            }
-            return this._lazy.links;
-        };
-        FileSystem.prototype._getLinks = function (node) {
-            if (!node.links) {
-                var links = new collections.SortedMap(this.stringComparer);
-                var source = node.source, resolver = node.resolver;
-                if (source && resolver) {
-                    node.source = undefined;
-                    node.resolver = undefined;
-                    for (var _i = 0, _a = resolver.readdirSync(source); _i < _a.length; _i++) {
-                        var name = _a[_i];
-                        var path = vpath.combine(source, name);
-                        var stats = resolver.statSync(path);
-                        switch (stats.mode & S_IFMT) {
-                            case S_IFDIR:
-                                var dir = this._mknod(node.dev, S_IFDIR, 511);
-                                dir.source = vpath.combine(source, name);
-                                dir.resolver = resolver;
-                                this._addLink(node, links, name, dir);
-                                break;
-                            case S_IFREG:
-                                var file = this._mknod(node.dev, S_IFREG, 438);
-                                file.source = vpath.combine(source, name);
-                                file.resolver = resolver;
-                                file.size = stats.size;
-                                this._addLink(node, links, name, file);
-                                break;
-                        }
-                    }
-                }
-                else if (this._shadowRoot && node.shadowRoot) {
-                    this._copyShadowLinks(this._shadowRoot._getLinks(node.shadowRoot), links);
-                }
-                node.links = links;
-            }
-            return node.links;
-        };
-        FileSystem.prototype._getShadow = function (root) {
-            var shadows = this._lazy.shadows || (this._lazy.shadows = new Map());
-            var shadow = shadows.get(root.ino);
-            if (!shadow) {
-                shadow = {
-                    dev: root.dev,
-                    ino: root.ino,
-                    mode: root.mode,
-                    atimeMs: root.atimeMs,
-                    mtimeMs: root.mtimeMs,
-                    ctimeMs: root.ctimeMs,
-                    birthtimeMs: root.birthtimeMs,
-                    nlink: root.nlink,
-                    shadowRoot: root
-                };
-                if (isSymlink(root))
-                    shadow.symlink = root.symlink;
-                shadows.set(shadow.ino, shadow);
-            }
-            return shadow;
-        };
-        FileSystem.prototype._copyShadowLinks = function (source, target) {
-            var iterator = collections.getIterator(source);
-            try {
-                for (var i = collections.nextResult(iterator); i; i = collections.nextResult(iterator)) {
-                    var _a = i.value, name = _a[0], root = _a[1];
-                    target.set(name, this._getShadow(root));
-                }
-            }
-            finally {
-                collections.closeIterator(iterator);
-            }
-        };
-        FileSystem.prototype._getSize = function (node) {
-            if (node.buffer)
-                return node.buffer.byteLength;
-            if (node.size !== undefined)
-                return node.size;
-            if (node.source && node.resolver)
-                return node.size = node.resolver.statSync(node.source).size;
-            if (this._shadowRoot && node.shadowRoot)
-                return node.size = this._shadowRoot._getSize(node.shadowRoot);
-            return 0;
-        };
-        FileSystem.prototype._getBuffer = function (node) {
-            if (!node.buffer) {
-                var source = node.source, resolver = node.resolver;
-                if (source && resolver) {
-                    node.source = undefined;
-                    node.resolver = undefined;
-                    node.size = undefined;
-                    node.buffer = resolver.readFileSync(source);
-                }
-                else if (this._shadowRoot && node.shadowRoot) {
-                    node.buffer = this._shadowRoot._getBuffer(node.shadowRoot);
-                }
-                else {
-                    node.buffer = Buffer.allocUnsafe(0);
-                }
-            }
-            return node.buffer;
-        };
-        FileSystem.prototype._walk = function (path, noFollow, onError) {
-            var links = this._getRootLinks();
-            var parent;
-            var components = vpath.parse(path);
-            var step = 0;
-            var depth = 0;
-            var retry = false;
-            while (true) {
-                if (depth >= 40)
-                    throw createIOError("ELOOP");
-                var lastStep = step === components.length - 1;
-                var basename = components[step];
-                var node = links.get(basename);
-                if (lastStep && (noFollow || !isSymlink(node))) {
-                    return { realpath: vpath.format(components), basename: basename, parent: parent, links: links, node: node };
-                }
-                if (node === undefined) {
-                    if (trapError(createIOError("ENOENT"), node))
-                        continue;
-                    return undefined;
-                }
-                if (isSymlink(node)) {
-                    var dirname = vpath.format(components.slice(0, step));
-                    var symlink = vpath.resolve(dirname, node.symlink);
-                    links = this._getRootLinks();
-                    parent = undefined;
-                    components = vpath.parse(symlink).concat(components.slice(step + 1));
-                    step = 0;
-                    depth++;
-                    retry = false;
-                    continue;
-                }
-                if (isDirectory(node)) {
-                    links = this._getLinks(node);
-                    parent = node;
-                    step++;
-                    retry = false;
-                    continue;
-                }
-                if (trapError(createIOError("ENOTDIR"), node))
-                    continue;
-                return undefined;
-            }
-            function trapError(error, node) {
-                var realpath = vpath.format(components.slice(0, step + 1));
-                var basename = components[step];
-                var result = !retry && onError ? onError(error, { realpath: realpath, basename: basename, parent: parent, links: links, node: node }) : "throw";
-                if (result === "stop")
-                    return false;
-                if (result === "retry") {
-                    retry = true;
-                    return true;
-                }
-                throw error;
-            }
-        };
-        /**
-         * Resolve a path relative to the current working directory.
-         */
-        FileSystem.prototype._resolve = function (path) {
-            return this._cwd
-                ? vpath.resolve(this._cwd, vpath.validate(path, 2016 /* RelativeOrAbsolute */ | 2048 /* AllowWildcard */))
-                : vpath.validate(path, 2017 /* Absolute */ | 2048 /* AllowWildcard */);
-        };
-        FileSystem.prototype._applyFiles = function (files, dirname) {
-            var deferred = [];
-            this._applyFilesWorker(files, dirname, deferred);
-            for (var _i = 0, deferred_1 = deferred; _i < deferred_1.length; _i++) {
-                var _a = deferred_1[_i], entry = _a[0], path = _a[1];
-                this.mkdirpSync(vpath.dirname(path));
-                this.pushd(vpath.dirname(path));
-                if (entry instanceof Symlink) {
-                    if (this.stringComparer(vpath.dirname(path), path) === 0) {
-                        throw new TypeError("Roots cannot be symbolic links.");
-                    }
-                    this.symlinkSync(entry.symlink, path);
-                    this._applyFileExtendedOptions(path, entry);
-                }
-                else if (entry instanceof Link) {
-                    if (this.stringComparer(vpath.dirname(path), path) === 0) {
-                        throw new TypeError("Roots cannot be hard links.");
-                    }
-                    this.linkSync(entry.path, path);
-                }
-                else {
-                    this.mountSync(entry.source, path, entry.resolver);
-                    this._applyFileExtendedOptions(path, entry);
-                }
-                this.popd();
-            }
-        };
-        FileSystem.prototype._applyFileExtendedOptions = function (path, entry) {
-            var meta = entry.meta;
-            if (meta !== undefined) {
-                var filemeta = this.filemeta(path);
-                for (var _i = 0, _a = Object.keys(meta); _i < _a.length; _i++) {
-                    var key = _a[_i];
-                    filemeta.set(key, meta[key]);
-                }
-            }
-        };
-        FileSystem.prototype._applyFilesWorker = function (files, dirname, deferred) {
-            for (var _i = 0, _a = Object.keys(files); _i < _a.length; _i++) {
-                var key = _a[_i];
-                var value = this._normalizeFileSetEntry(files[key]);
-                var path = dirname ? vpath.resolve(dirname, key) : key;
-                vpath.validate(path, 2017 /* Absolute */);
-                if (value === null || value === undefined) {
-                    if (this.stringComparer(vpath.dirname(path), path) === 0) {
-                        throw new TypeError("Roots cannot be deleted.");
-                    }
-                    this.rimrafSync(path);
-                }
-                else if (value instanceof File) {
-                    if (this.stringComparer(vpath.dirname(path), path) === 0) {
-                        throw new TypeError("Roots cannot be files.");
-                    }
-                    this.mkdirpSync(vpath.dirname(path));
-                    this.writeFileSync(path, value.data, value.encoding);
-                    this._applyFileExtendedOptions(path, value);
-                }
-                else if (value instanceof Directory) {
-                    this.mkdirpSync(path);
-                    this._applyFileExtendedOptions(path, value);
-                    this._applyFilesWorker(value.files, path, deferred);
-                }
-                else {
-                    deferred.push([value, path]);
-                }
-            }
-        };
-        FileSystem.prototype._normalizeFileSetEntry = function (value) {
-            if (value === undefined ||
-                value === null ||
-                value instanceof Directory ||
-                value instanceof File ||
-                value instanceof Link ||
-                value instanceof Symlink ||
-                value instanceof Mount) {
-                return value;
-            }
-            return typeof value === "string" || Buffer.isBuffer(value) ? new File(value) : new Directory(value);
-        };
-        return FileSystem;
-    }());
-    vfs.FileSystem = FileSystem;
-    function createResolver(host) {
-        return {
-            readdirSync: function (path) {
-                var _a = host.getAccessibleFileSystemEntries(path), files = _a.files, directories = _a.directories;
-                return directories.concat(files);
-            },
-            statSync: function (path) {
-                if (host.directoryExists(path)) {
-                    return { mode: S_IFDIR | 511, size: 0 };
-                }
-                else if (host.fileExists(path)) {
-                    return { mode: S_IFREG | 438, size: host.getFileSize(path) };
-                }
-                else {
-                    throw new Error("ENOENT: path does not exist");
-                }
-            },
-            readFileSync: function (path) {
-                return Buffer.from(host.readFile(path), "utf8"); // TODO: GH#18217
-            }
-        };
-    }
-    vfs.createResolver = createResolver;
-    /**
-     * Create a virtual file system from a physical file system using the following path mappings:
-     *
-     *  - `/.ts` is a directory mapped to `${workspaceRoot}/built/local`
-     *  - `/.lib` is a directory mapped to `${workspaceRoot}/tests/lib`
-     *  - `/.src` is a virtual directory to be used for tests.
-     *
-     * Unless overridden, `/.src` will be the current working directory for the virtual file system.
-     */
-    function createFromFileSystem(host, ignoreCase, _a) {
-        var _b = _a === void 0 ? {} : _a, documents = _b.documents, cwd = _b.cwd;
-        var fs = getBuiltLocal(host, ignoreCase).shadow();
-        if (cwd) {
-            fs.mkdirpSync(cwd);
-            fs.chdir(cwd);
-        }
-        if (documents) {
-            for (var _i = 0, documents_1 = documents; _i < documents_1.length; _i++) {
-                var document = documents_1[_i];
-                fs.mkdirpSync(vpath.dirname(document.file));
-                fs.writeFileSync(document.file, document.text, "utf8");
-                fs.filemeta(document.file).set("document", document);
-                // Add symlinks
-                var symlink = document.meta.get("symlink");
-                if (symlink) {
-                    for (var _c = 0, _d = symlink.split(",").map(function (link) { return link.trim(); }); _c < _d.length; _c++) {
-                        var link = _d[_c];
-                        fs.mkdirpSync(vpath.dirname(link));
-                        fs.symlinkSync(document.file, link);
-                        fs.filemeta(link).set("document", document);
-                    }
-                }
-            }
-        }
-        return fs;
-    }
-    vfs.createFromFileSystem = createFromFileSystem;
-    var Stats = /** @class */ (function () {
-        function Stats(dev, ino, mode, nlink, rdev, size, blksize, blocks, atimeMs, mtimeMs, ctimeMs, birthtimeMs) {
-            if (dev === void 0) { dev = 0; }
-            if (ino === void 0) { ino = 0; }
-            if (mode === void 0) { mode = 0; }
-            if (nlink === void 0) { nlink = 0; }
-            if (rdev === void 0) { rdev = 0; }
-            if (size === void 0) { size = 0; }
-            if (blksize === void 0) { blksize = 0; }
-            if (blocks === void 0) { blocks = 0; }
-            if (atimeMs === void 0) { atimeMs = 0; }
-            if (mtimeMs === void 0) { mtimeMs = 0; }
-            if (ctimeMs === void 0) { ctimeMs = 0; }
-            if (birthtimeMs === void 0) { birthtimeMs = 0; }
-            this.dev = dev;
-            this.ino = ino;
-            this.mode = mode;
-            this.nlink = nlink;
-            this.uid = 0;
-            this.gid = 0;
-            this.rdev = rdev;
-            this.size = size;
-            this.blksize = blksize;
-            this.blocks = blocks;
-            this.atimeMs = atimeMs;
-            this.mtimeMs = mtimeMs;
-            this.ctimeMs = ctimeMs;
-            this.birthtimeMs = birthtimeMs;
-            this.atime = new Date(this.atimeMs);
-            this.mtime = new Date(this.mtimeMs);
-            this.ctime = new Date(this.ctimeMs);
-            this.birthtime = new Date(this.birthtimeMs);
-        }
-        Stats.prototype.isFile = function () { return (this.mode & S_IFMT) === S_IFREG; };
-        Stats.prototype.isDirectory = function () { return (this.mode & S_IFMT) === S_IFDIR; };
-        Stats.prototype.isSymbolicLink = function () { return (this.mode & S_IFMT) === S_IFLNK; };
-        Stats.prototype.isBlockDevice = function () { return (this.mode & S_IFMT) === S_IFBLK; };
-        Stats.prototype.isCharacterDevice = function () { return (this.mode & S_IFMT) === S_IFCHR; };
-        Stats.prototype.isFIFO = function () { return (this.mode & S_IFMT) === S_IFIFO; };
-        Stats.prototype.isSocket = function () { return (this.mode & S_IFMT) === S_IFSOCK; };
-        return Stats;
-    }());
-    vfs.Stats = Stats;
-    // tslint:disable-next-line:variable-name
-    vfs.IOErrorMessages = Object.freeze({
-        EACCES: "access denied",
-        EIO: "an I/O error occurred",
-        ENOENT: "no such file or directory",
-        EEXIST: "file already exists",
-        ELOOP: "too many symbolic links encountered",
-        ENOTDIR: "no such directory",
-        EISDIR: "path is a directory",
-        EBADF: "invalid file descriptor",
-        EINVAL: "invalid value",
-        ENOTEMPTY: "directory not empty",
-        EPERM: "operation not permitted",
-        EROFS: "file system is read-only"
-    });
-    function createIOError(code, details) {
-        if (details === void 0) { details = ""; }
-        var err = new Error(code + ": " + vfs.IOErrorMessages[code] + " " + details);
-        err.code = code;
-        if (Error.captureStackTrace)
-            Error.captureStackTrace(err, createIOError);
-        return err;
-    }
-    vfs.createIOError = createIOError;
-    /** Extended options for a directory in a `FileSet` */
-    var Directory = /** @class */ (function () {
-        function Directory(files, _a) {
-            var meta = (_a === void 0 ? {} : _a).meta;
-            this.files = files;
-            this.meta = meta;
-        }
-        return Directory;
-    }());
-    vfs.Directory = Directory;
-    /** Extended options for a file in a `FileSet` */
-    var File = /** @class */ (function () {
-        function File(data, _a) {
-            var _b = _a === void 0 ? {} : _a, meta = _b.meta, encoding = _b.encoding;
-            this.data = data;
-            this.encoding = encoding;
-            this.meta = meta;
-        }
-        return File;
-    }());
-    vfs.File = File;
-    /** Extended options for a hard link in a `FileSet` */
-    var Link = /** @class */ (function () {
-        function Link(path) {
-            this.path = path;
-        }
-        return Link;
-    }());
-    vfs.Link = Link;
-    /** Extended options for a symbolic link in a `FileSet` */
-    var Symlink = /** @class */ (function () {
-        function Symlink(symlink, _a) {
-            var meta = (_a === void 0 ? {} : _a).meta;
-            this.symlink = symlink;
-            this.meta = meta;
-        }
-        return Symlink;
-    }());
-    vfs.Symlink = Symlink;
-    /** Extended options for mounting a virtual copy of an external file system via a `FileSet` */
-    var Mount = /** @class */ (function () {
-        function Mount(source, resolver, _a) {
-            var meta = (_a === void 0 ? {} : _a).meta;
-            this.source = source;
-            this.resolver = resolver;
-            this.meta = meta;
-        }
-        return Mount;
-    }());
-    vfs.Mount = Mount;
-    function isFile(node) {
-        return node !== undefined && (node.mode & S_IFMT) === S_IFREG;
-    }
-    function isDirectory(node) {
-        return node !== undefined && (node.mode & S_IFMT) === S_IFDIR;
-    }
-    function isSymlink(node) {
-        return node !== undefined && (node.mode & S_IFMT) === S_IFLNK;
-    }
-    var builtLocalHost;
-    var builtLocalCI;
-    var builtLocalCS;
-    function getBuiltLocal(host, ignoreCase) {
-        var _a;
-        if (builtLocalHost !== host) {
-            builtLocalCI = undefined;
-            builtLocalCS = undefined;
-            builtLocalHost = host;
-        }
-        if (!builtLocalCI) {
-            var resolver = createResolver(host);
-            builtLocalCI = new FileSystem(/*ignoreCase*/ true, {
-                files: (_a = {},
-                    _a[vfs.builtFolder] = new Mount(vpath.resolve(host.getWorkspaceRoot(), "built/local"), resolver),
-                    _a[vfs.testLibFolder] = new Mount(vpath.resolve(host.getWorkspaceRoot(), "tests/lib"), resolver),
-                    _a[vfs.projectsFolder] = new Mount(vpath.resolve(host.getWorkspaceRoot(), "tests/projects"), resolver),
-                    _a[vfs.srcFolder] = {},
-                    _a),
-                cwd: vfs.srcFolder,
-                meta: { defaultLibLocation: vfs.builtFolder }
-            });
-            builtLocalCI.makeReadonly();
-        }
-        if (ignoreCase)
-            return builtLocalCI;
-        if (!builtLocalCS) {
-            builtLocalCS = builtLocalCI.shadow(/*ignoreCase*/ false);
-            builtLocalCS.makeReadonly();
-        }
-        return builtLocalCS;
-    }
-})(vfs || (vfs = {}));
-// tslint:enable:no-null-keyword
-/**
- * Test harness compiler functionality.
- */
-var compiler;
-(function (compiler) {
-    function readProject(host, project, existingOptions) {
-        if (project) {
-            project = vpath.isTsConfigFile(project) ? project : vpath.combine(project, "tsconfig.json");
-        }
-        else {
-            project = host.vfs.scanSync(".", "ancestors-or-self", {
-                accept: function (path, stats) { return stats.isFile() && host.vfs.stringComparer(vpath.basename(path), "tsconfig.json") === 0; }
-            })[0];
-        }
-        if (project) {
-            // TODO(rbuckton): Do we need to resolve this? Resolving breaks projects tests.
-            // project = vpath.resolve(host.vfs.currentDirectory, project);
-            // read the config file
-            var readResult = ts.readConfigFile(project, function (path) { return host.readFile(path); });
-            if (readResult.error) {
-                return { file: project, errors: [readResult.error] };
-            }
-            // parse the config file
-            var config = ts.parseJsonConfigFileContent(readResult.config, host, vpath.dirname(project), existingOptions);
-            return { file: project, errors: config.errors, config: config };
-        }
-    }
-    compiler.readProject = readProject;
-    var CompilationResult = /** @class */ (function () {
-        function CompilationResult(host, options, program, result, diagnostics) {
-            this._inputs = [];
-            this.host = host;
-            this.program = program;
-            this.result = result;
-            this.diagnostics = diagnostics;
-            this.options = program ? program.getCompilerOptions() : options;
-            // collect outputs
-            var js = this.js = new collections.SortedMap({ comparer: this.vfs.stringComparer, sort: "insertion" });
-            var dts = this.dts = new collections.SortedMap({ comparer: this.vfs.stringComparer, sort: "insertion" });
-            var maps = this.maps = new collections.SortedMap({ comparer: this.vfs.stringComparer, sort: "insertion" });
-            for (var _i = 0, _a = this.host.outputs; _i < _a.length; _i++) {
-                var document = _a[_i];
-                if (vpath.isJavaScript(document.file) || ts.fileExtensionIs(document.file, ".json" /* Json */)) {
-                    js.set(document.file, document);
-                }
-                else if (vpath.isDeclaration(document.file)) {
-                    dts.set(document.file, document);
-                }
-                else if (vpath.isSourceMap(document.file)) {
-                    maps.set(document.file, document);
-                }
-            }
-            // correlate inputs and outputs
-            this._inputsAndOutputs = new collections.SortedMap({ comparer: this.vfs.stringComparer, sort: "insertion" });
-            if (program) {
-                if (this.options.out || this.options.outFile) {
-                    var outFile = vpath.resolve(this.vfs.cwd(), this.options.outFile || this.options.out);
-                    var inputs = [];
-                    for (var _b = 0, _c = program.getSourceFiles(); _b < _c.length; _b++) {
-                        var sourceFile = _c[_b];
-                        if (sourceFile) {
-                            var input = new documents.TextDocument(sourceFile.fileName, sourceFile.text);
-                            this._inputs.push(input);
-                            if (!vpath.isDeclaration(sourceFile.fileName)) {
-                                inputs.push(input);
-                            }
-                        }
-                    }
-                    var outputs = {
-                        inputs: inputs,
-                        js: js.get(outFile),
-                        dts: dts.get(vpath.changeExtension(outFile, ".d.ts")),
-                        map: maps.get(outFile + ".map")
-                    };
-                    if (outputs.js)
-                        this._inputsAndOutputs.set(outputs.js.file, outputs);
-                    if (outputs.dts)
-                        this._inputsAndOutputs.set(outputs.dts.file, outputs);
-                    if (outputs.map)
-                        this._inputsAndOutputs.set(outputs.map.file, outputs);
-                    for (var _d = 0, inputs_1 = inputs; _d < inputs_1.length; _d++) {
-                        var input = inputs_1[_d];
-                        this._inputsAndOutputs.set(input.file, outputs);
-                    }
-                }
-                else {
-                    for (var _e = 0, _f = program.getSourceFiles(); _e < _f.length; _e++) {
-                        var sourceFile = _f[_e];
-                        if (sourceFile) {
-                            var input = new documents.TextDocument(sourceFile.fileName, sourceFile.text);
-                            this._inputs.push(input);
-                            if (!vpath.isDeclaration(sourceFile.fileName)) {
-                                var extname = ts.getOutputExtension(sourceFile, this.options);
-                                var outputs = {
-                                    inputs: [input],
-                                    js: js.get(this.getOutputPath(sourceFile.fileName, extname)),
-                                    dts: dts.get(this.getOutputPath(sourceFile.fileName, ".d.ts")),
-                                    map: maps.get(this.getOutputPath(sourceFile.fileName, extname + ".map"))
-                                };
-                                this._inputsAndOutputs.set(sourceFile.fileName, outputs);
-                                if (outputs.js)
-                                    this._inputsAndOutputs.set(outputs.js.file, outputs);
-                                if (outputs.dts)
-                                    this._inputsAndOutputs.set(outputs.dts.file, outputs);
-                                if (outputs.map)
-                                    this._inputsAndOutputs.set(outputs.map.file, outputs);
-                            }
-                        }
-                    }
-                }
-            }
-            this.diagnostics = diagnostics;
-        }
-        Object.defineProperty(CompilationResult.prototype, "vfs", {
-            get: function () {
-                return this.host.vfs;
-            },
-            enumerable: true,
-            configurable: true
-        });
-        Object.defineProperty(CompilationResult.prototype, "inputs", {
-            get: function () {
-                return this._inputs;
-            },
-            enumerable: true,
-            configurable: true
-        });
-        Object.defineProperty(CompilationResult.prototype, "outputs", {
-            get: function () {
-                return this.host.outputs;
-            },
-            enumerable: true,
-            configurable: true
-        });
-        Object.defineProperty(CompilationResult.prototype, "traces", {
-            get: function () {
-                return this.host.traces;
-            },
-            enumerable: true,
-            configurable: true
-        });
-        Object.defineProperty(CompilationResult.prototype, "emitSkipped", {
-            get: function () {
-                return this.result && this.result.emitSkipped || false;
-            },
-            enumerable: true,
-            configurable: true
-        });
-        Object.defineProperty(CompilationResult.prototype, "singleFile", {
-            get: function () {
-                return !!this.options.outFile || !!this.options.out;
-            },
-            enumerable: true,
-            configurable: true
-        });
-        Object.defineProperty(CompilationResult.prototype, "commonSourceDirectory", {
-            get: function () {
-                var common = this.program && this.program.getCommonSourceDirectory() || "";
-                return common && vpath.combine(this.vfs.cwd(), common);
-            },
-            enumerable: true,
-            configurable: true
-        });
-        CompilationResult.prototype.getInputsAndOutputs = function (path) {
-            return this._inputsAndOutputs.get(vpath.resolve(this.vfs.cwd(), path));
-        };
-        CompilationResult.prototype.getInputs = function (path) {
-            var outputs = this.getInputsAndOutputs(path);
-            return outputs && outputs.inputs;
-        };
-        CompilationResult.prototype.getOutput = function (path, kind) {
-            var outputs = this.getInputsAndOutputs(path);
-            return outputs && outputs[kind];
-        };
-        CompilationResult.prototype.getSourceMapRecord = function () {
-            if (this.result.sourceMaps && this.result.sourceMaps.length > 0) {
-                return Harness.SourceMapRecorder.getSourceMapRecord(this.result.sourceMaps, this.program, Array.from(this.js.values()).filter(function (d) { return !ts.fileExtensionIs(d.file, ".json" /* Json */); }), Array.from(this.dts.values()));
-            }
-        };
-        CompilationResult.prototype.getSourceMap = function (path) {
-            if (this.options.noEmit || vpath.isDeclaration(path))
-                return undefined;
-            if (this.options.inlineSourceMap) {
-                var document = this.getOutput(path, "js");
-                return document && documents.SourceMap.fromSource(document.text);
-            }
-            if (this.options.sourceMap) {
-                var document = this.getOutput(path, "map");
-                return document && new documents.SourceMap(document.file, document.text);
-            }
-        };
-        CompilationResult.prototype.getOutputPath = function (path, ext) {
-            if (this.options.outFile || this.options.out) {
-                path = vpath.resolve(this.vfs.cwd(), this.options.outFile || this.options.out);
-            }
-            else {
-                path = vpath.resolve(this.vfs.cwd(), path);
-                var outDir = ext === ".d.ts" ? this.options.declarationDir || this.options.outDir : this.options.outDir;
-                if (outDir) {
-                    var common = this.commonSourceDirectory;
-                    if (common) {
-                        path = vpath.relative(common, path, this.vfs.ignoreCase);
-                        path = vpath.combine(vpath.resolve(this.vfs.cwd(), this.options.outDir), path);
-                    }
-                }
-            }
-            return vpath.changeExtension(path, ext);
-        };
-        CompilationResult.prototype.getNumberOfJsFiles = function () {
-            var count = this.js.size;
-            this.js.forEach(function (document) {
-                if (ts.fileExtensionIs(document.file, ".json" /* Json */)) {
-                    count--;
-                }
-            });
-            return count;
-        };
-        return CompilationResult;
-    }());
-    compiler.CompilationResult = CompilationResult;
-    function compileFiles(host, rootFiles, compilerOptions) {
-        if (compilerOptions.project || !rootFiles || rootFiles.length === 0) {
-            var project = readProject(host.parseConfigHost, compilerOptions.project, compilerOptions);
-            if (project) {
-                if (project.errors && project.errors.length > 0) {
-                    return new CompilationResult(host, compilerOptions, /*program*/ undefined, /*result*/ undefined, project.errors);
-                }
-                if (project.config) {
-                    rootFiles = project.config.fileNames;
-                    compilerOptions = project.config.options;
-                }
-            }
-            delete compilerOptions.project;
-        }
-        // establish defaults (aligns with old harness)
-        if (compilerOptions.target === undefined)
-            compilerOptions.target = 0 /* ES3 */;
-        if (compilerOptions.newLine === undefined)
-            compilerOptions.newLine = 0 /* CarriageReturnLineFeed */;
-        if (compilerOptions.skipDefaultLibCheck === undefined)
-            compilerOptions.skipDefaultLibCheck = true;
-        if (compilerOptions.noErrorTruncation === undefined)
-            compilerOptions.noErrorTruncation = true;
-        var program = ts.createProgram(rootFiles || [], compilerOptions, host);
-        var emitResult = program.emit();
-        var errors = ts.getPreEmitDiagnostics(program);
-        return new CompilationResult(host, compilerOptions, program, emitResult, errors);
-    }
-    compiler.compileFiles = compileFiles;
-})(compiler || (compiler = {}));
-var evaluator;
-(function (evaluator) {
-    var sourceFile = vpath.combine(vfs.srcFolder, "source.ts");
-    function compile(sourceText, options) {
-        var fs = vfs.createFromFileSystem(Harness.IO, /*ignoreCase*/ false);
-        fs.writeFileSync(sourceFile, sourceText);
-        var compilerOptions = __assign({ target: 1 /* ES5 */, module: ts.ModuleKind.CommonJS, lib: ["lib.esnext.d.ts", "lib.dom.d.ts"] }, options);
-        var host = new fakes.CompilerHost(fs, compilerOptions);
-        return compiler.compileFiles(host, [sourceFile], compilerOptions);
-    }
-    function noRequire(id) {
-        throw new Error("Module '" + id + "' could not be found.");
-    }
-    // Define a custom "Symbol" constructor to attach missing built-in symbols without
-    // modifying the global "Symbol" constructor
-    // tslint:disable-next-line:variable-name
-    var FakeSymbol = (function (description) { return Symbol(description); });
-    FakeSymbol.prototype = Symbol.prototype;
-    for (var _i = 0, _a = Object.getOwnPropertyNames(Symbol); _i < _a.length; _i++) {
-        var key = _a[_i];
-        Object.defineProperty(FakeSymbol, key, Object.getOwnPropertyDescriptor(Symbol, key));
-    }
-    // Add "asyncIterator" if missing
-    if (!ts.hasProperty(FakeSymbol, "asyncIterator"))
-        Object.defineProperty(FakeSymbol, "asyncIterator", { value: Symbol.for("Symbol.asyncIterator"), configurable: true });
-    function evaluate(result, globals) {
-        globals = __assign({ Symbol: FakeSymbol }, globals);
-        if (ts.some(result.diagnostics)) {
-            assert.ok(/*value*/ false, "Syntax error in evaluation source text:\n" + ts.formatDiagnostics(result.diagnostics, {
-                getCanonicalFileName: function (file) { return file; },
-                getCurrentDirectory: function () { return ""; },
-                getNewLine: function () { return "\n"; }
-            }));
-        }
-        var output = result.getOutput(sourceFile, "js");
-        assert.isDefined(output);
-        var globalNames = [];
-        var globalArgs = [];
-        for (var name in globals) {
-            if (ts.hasProperty(globals, name)) {
-                globalNames.push(name);
-                globalArgs.push(globals[name]);
-            }
-        }
-        var evaluateText = "(function (module, exports, require, __dirname, __filename, " + globalNames.join(", ") + ") { " + output.text + " })";
-        var evaluateThunk = eval(evaluateText);
-        var module = { exports: {} };
-        evaluateThunk.call.apply(evaluateThunk, [globals, module, module.exports, noRequire, vpath.dirname(output.file), output.file, FakeSymbol].concat(globalArgs));
-        return module.exports;
-    }
-    function evaluateTypeScript(sourceText, options, globals) {
-        return evaluate(compile(sourceText, options), globals);
-    }
-    evaluator.evaluateTypeScript = evaluateTypeScript;
-})(evaluator || (evaluator = {}));
-/**
- * Fake implementations of various compiler dependencies.
- */
-var fakes;
-(function (fakes) {
-    var processExitSentinel = new Error("System exit");
-    /**
-     * A fake `ts.System` that leverages a virtual file system.
-     */
-    var System = /** @class */ (function () {
-        function System(vfs, _a) {
-            var _b = _a === void 0 ? {} : _a, executingFilePath = _b.executingFilePath, _c = _b.newLine, newLine = _c === void 0 ? "\r\n" : _c, env = _b.env;
-            this.args = [];
-            this.output = [];
-            this.vfs = vfs.isReadonly ? vfs.shadow() : vfs;
-            this.useCaseSensitiveFileNames = !this.vfs.ignoreCase;
-            this.newLine = newLine;
-            this._executingFilePath = executingFilePath;
-            this._env = env;
-        }
-        System.prototype.write = function (message) {
-            this.output.push(message);
-        };
-        System.prototype.readFile = function (path) {
-            try {
-                var content = this.vfs.readFileSync(path, "utf8");
-                return content === undefined ? undefined : utils.removeByteOrderMark(content);
-            }
-            catch (_a) {
-                return undefined;
-            }
-        };
-        System.prototype.writeFile = function (path, data, writeByteOrderMark) {
-            this.vfs.mkdirpSync(vpath.dirname(path));
-            this.vfs.writeFileSync(path, writeByteOrderMark ? utils.addUTF8ByteOrderMark(data) : data);
-        };
-        System.prototype.deleteFile = function (path) {
-            this.vfs.unlinkSync(path);
-        };
-        System.prototype.fileExists = function (path) {
-            var stats = this._getStats(path);
-            return stats ? stats.isFile() : false;
-        };
-        System.prototype.directoryExists = function (path) {
-            var stats = this._getStats(path);
-            return stats ? stats.isDirectory() : false;
-        };
-        System.prototype.createDirectory = function (path) {
-            this.vfs.mkdirpSync(path);
-        };
-        System.prototype.getCurrentDirectory = function () {
-            return this.vfs.cwd();
-        };
-        System.prototype.getDirectories = function (path) {
-            var result = [];
-            try {
-                for (var _i = 0, _a = this.vfs.readdirSync(path); _i < _a.length; _i++) {
-                    var file = _a[_i];
-                    if (this.vfs.statSync(vpath.combine(path, file)).isDirectory()) {
-                        result.push(file);
-                    }
-                }
-            }
-            catch ( /*ignore*/_b) { /*ignore*/ }
-            return result;
-        };
-        System.prototype.readDirectory = function (path, extensions, exclude, include, depth) {
-            var _this = this;
-            return ts.matchFiles(path, extensions, exclude, include, this.useCaseSensitiveFileNames, this.getCurrentDirectory(), depth, function (path) { return _this.getAccessibleFileSystemEntries(path); });
-        };
-        System.prototype.getAccessibleFileSystemEntries = function (path) {
-            var files = [];
-            var directories = [];
-            try {
-                for (var _i = 0, _a = this.vfs.readdirSync(path); _i < _a.length; _i++) {
-                    var file = _a[_i];
-                    try {
-                        var stats = this.vfs.statSync(vpath.combine(path, file));
-                        if (stats.isFile()) {
-                            files.push(file);
-                        }
-                        else if (stats.isDirectory()) {
-                            directories.push(file);
-                        }
-                    }
-                    catch ( /*ignored*/_b) { /*ignored*/ }
-                }
-            }
-            catch ( /*ignored*/_c) { /*ignored*/ }
-            return { files: files, directories: directories };
-        };
-        System.prototype.exit = function (exitCode) {
-            this.exitCode = exitCode;
-            throw processExitSentinel;
-        };
-        System.prototype.getFileSize = function (path) {
-            var stats = this._getStats(path);
-            return stats && stats.isFile() ? stats.size : 0;
-        };
-        System.prototype.resolvePath = function (path) {
-            return vpath.resolve(this.vfs.cwd(), path);
-        };
-        System.prototype.getExecutingFilePath = function () {
-            if (this._executingFilePath === undefined)
-                return ts.notImplemented();
-            return this._executingFilePath;
-        };
-        System.prototype.getModifiedTime = function (path) {
-            var stats = this._getStats(path);
-            return stats ? stats.mtime : undefined; // TODO: GH#18217
-        };
-        System.prototype.setModifiedTime = function (path, time) {
-            this.vfs.utimesSync(path, time, time);
-        };
-        System.prototype.createHash = function (data) {
-            return data;
-        };
-        System.prototype.realpath = function (path) {
-            try {
-                return this.vfs.realpathSync(path);
-            }
-            catch (_a) {
-                return path;
-            }
-        };
-        System.prototype.getEnvironmentVariable = function (name) {
-            return (this._env && this._env[name]); // TODO: GH#18217
-        };
-        System.prototype._getStats = function (path) {
-            try {
-                return this.vfs.existsSync(path) ? this.vfs.statSync(path) : undefined;
-            }
-            catch (_a) {
-                return undefined;
-            }
-        };
-        return System;
-    }());
-    fakes.System = System;
-    /**
-     * A fake `ts.ParseConfigHost` that leverages a virtual file system.
-     */
-    var ParseConfigHost = /** @class */ (function () {
-        function ParseConfigHost(sys) {
-            if (sys instanceof vfs.FileSystem)
-                sys = new System(sys);
-            this.sys = sys;
-        }
-        Object.defineProperty(ParseConfigHost.prototype, "vfs", {
-            get: function () {
-                return this.sys.vfs;
-            },
-            enumerable: true,
-            configurable: true
-        });
-        Object.defineProperty(ParseConfigHost.prototype, "useCaseSensitiveFileNames", {
-            get: function () {
-                return this.sys.useCaseSensitiveFileNames;
-            },
-            enumerable: true,
-            configurable: true
-        });
-        ParseConfigHost.prototype.fileExists = function (fileName) {
-            return this.sys.fileExists(fileName);
-        };
-        ParseConfigHost.prototype.directoryExists = function (directoryName) {
-            return this.sys.directoryExists(directoryName);
-        };
-        ParseConfigHost.prototype.readFile = function (path) {
-            return this.sys.readFile(path);
-        };
-        ParseConfigHost.prototype.readDirectory = function (path, extensions, excludes, includes, depth) {
-            return this.sys.readDirectory(path, extensions, excludes, includes, depth);
-        };
-        return ParseConfigHost;
-    }());
-    fakes.ParseConfigHost = ParseConfigHost;
-    /**
-     * A fake `ts.CompilerHost` that leverages a virtual file system.
-     */
-    var CompilerHost = /** @class */ (function () {
-        function CompilerHost(sys, options, setParentNodes) {
-            if (options === void 0) { options = ts.getDefaultCompilerOptions(); }
-            if (setParentNodes === void 0) { setParentNodes = false; }
-            var _this = this;
-            this.outputs = [];
-            this.traces = [];
-            this.shouldAssertInvariants = !Harness.lightMode;
-            if (sys instanceof vfs.FileSystem)
-                sys = new System(sys);
-            this.sys = sys;
-            this.defaultLibLocation = sys.vfs.meta.get("defaultLibLocation") || "";
-            this._newLine = ts.getNewLineCharacter(options, function () { return _this.sys.newLine; });
-            this._sourceFiles = new collections.SortedMap({ comparer: sys.vfs.stringComparer, sort: "insertion" });
-            this._setParentNodes = setParentNodes;
-            this._outputsMap = new collections.SortedMap(this.vfs.stringComparer);
-        }
-        Object.defineProperty(CompilerHost.prototype, "vfs", {
-            get: function () {
-                return this.sys.vfs;
-            },
-            enumerable: true,
-            configurable: true
-        });
-        Object.defineProperty(CompilerHost.prototype, "parseConfigHost", {
-            get: function () {
-                return this._parseConfigHost || (this._parseConfigHost = new ParseConfigHost(this.sys));
-            },
-            enumerable: true,
-            configurable: true
-        });
-        CompilerHost.prototype.getCurrentDirectory = function () {
-            return this.sys.getCurrentDirectory();
-        };
-        CompilerHost.prototype.useCaseSensitiveFileNames = function () {
-            return this.sys.useCaseSensitiveFileNames;
-        };
-        CompilerHost.prototype.getNewLine = function () {
-            return this._newLine;
-        };
-        CompilerHost.prototype.getCanonicalFileName = function (fileName) {
-            return this.sys.useCaseSensitiveFileNames ? fileName : fileName.toLowerCase();
-        };
-        CompilerHost.prototype.deleteFile = function (fileName) {
-            this.sys.deleteFile(fileName);
-        };
-        CompilerHost.prototype.fileExists = function (fileName) {
-            return this.sys.fileExists(fileName);
-        };
-        CompilerHost.prototype.directoryExists = function (directoryName) {
-            return this.sys.directoryExists(directoryName);
-        };
-        CompilerHost.prototype.getModifiedTime = function (fileName) {
-            return this.sys.getModifiedTime(fileName);
-        };
-        CompilerHost.prototype.setModifiedTime = function (fileName, time) {
-            return this.sys.setModifiedTime(fileName, time);
-        };
-        CompilerHost.prototype.getDirectories = function (path) {
-            return this.sys.getDirectories(path);
-        };
-        CompilerHost.prototype.readDirectory = function (path, extensions, exclude, include, depth) {
-            return this.sys.readDirectory(path, extensions, exclude, include, depth);
-        };
-        CompilerHost.prototype.readFile = function (path) {
-            return this.sys.readFile(path);
-        };
-        CompilerHost.prototype.writeFile = function (fileName, content, writeByteOrderMark) {
-            if (writeByteOrderMark)
-                content = utils.addUTF8ByteOrderMark(content);
-            this.sys.writeFile(fileName, content);
-            var document = new documents.TextDocument(fileName, content);
-            document.meta.set("fileName", fileName);
-            this.vfs.filemeta(fileName).set("document", document);
-            if (!this._outputsMap.has(document.file)) {
-                this._outputsMap.set(document.file, this.outputs.length);
-                this.outputs.push(document);
-            }
-            this.outputs[this._outputsMap.get(document.file)] = document;
-        };
-        CompilerHost.prototype.trace = function (s) {
-            this.traces.push(s);
-        };
-        CompilerHost.prototype.realpath = function (path) {
-            return this.sys.realpath(path);
-        };
-        CompilerHost.prototype.getDefaultLibLocation = function () {
-            return vpath.resolve(this.getCurrentDirectory(), this.defaultLibLocation);
-        };
-        CompilerHost.prototype.getDefaultLibFileName = function (options) {
-            return vpath.resolve(this.getDefaultLibLocation(), ts.getDefaultLibFileName(options));
-        };
-        CompilerHost.prototype.getSourceFile = function (fileName, languageVersion) {
-            var canonicalFileName = this.getCanonicalFileName(vpath.resolve(this.getCurrentDirectory(), fileName));
-            var existing = this._sourceFiles.get(canonicalFileName);
-            if (existing)
-                return existing;
-            var content = this.readFile(canonicalFileName);
-            if (content === undefined)
-                return undefined;
-            // A virtual file system may shadow another existing virtual file system. This
-            // allows us to reuse a common virtual file system structure across multiple
-            // tests. If a virtual file is a shadow, it is likely that the file will be
-            // reused across multiple tests. In that case, we cache the SourceFile we parse
-            // so that it can be reused across multiple tests to avoid the cost of
-            // repeatedly parsing the same file over and over (such as lib.d.ts).
-            var cacheKey = this.vfs.shadowRoot && "SourceFile[languageVersion=" + languageVersion + ",setParentNodes=" + this._setParentNodes + "]";
-            if (cacheKey) {
-                var meta = this.vfs.filemeta(canonicalFileName);
-                var sourceFileFromMetadata = meta.get(cacheKey);
-                if (sourceFileFromMetadata && sourceFileFromMetadata.getFullText() === content) {
-                    this._sourceFiles.set(canonicalFileName, sourceFileFromMetadata);
-                    return sourceFileFromMetadata;
-                }
-            }
-            var parsed = ts.createSourceFile(fileName, content, languageVersion, this._setParentNodes || this.shouldAssertInvariants);
-            if (this.shouldAssertInvariants) {
-                Utils.assertInvariants(parsed, /*parent*/ undefined);
-            }
-            this._sourceFiles.set(canonicalFileName, parsed);
-            if (cacheKey) {
-                // store the cached source file on the unshadowed file with the same version.
-                var stats = this.vfs.statSync(canonicalFileName);
-                var fs = this.vfs;
-                while (fs.shadowRoot) {
-                    try {
-                        var shadowRootStats = fs.shadowRoot.existsSync(canonicalFileName) ? fs.shadowRoot.statSync(canonicalFileName) : undefined; // TODO: GH#18217
-                        if (shadowRootStats.dev !== stats.dev ||
-                            shadowRootStats.ino !== stats.ino ||
-                            shadowRootStats.mtimeMs !== stats.mtimeMs) {
-                            break;
-                        }
-                        fs = fs.shadowRoot;
-                    }
-                    catch (_a) {
-                        break;
-                    }
-                }
-                if (fs !== this.vfs) {
-                    fs.filemeta(canonicalFileName).set(cacheKey, parsed);
-                }
-            }
-            return parsed;
-        };
-        return CompilerHost;
-    }());
-    fakes.CompilerHost = CompilerHost;
-})(fakes || (fakes = {}));
-var ts;
-(function (ts) {
-    var server;
-    (function (server) {
-        /* @internal */
-        function extractMessage(message) {
-            // Read the content length
-            var contentLengthPrefix = "Content-Length: ";
-            var lines = message.split(/\r?\n/);
-            ts.Debug.assert(lines.length >= 2, "Malformed response: Expected 3 lines in the response.");
-            var contentLengthText = lines[0];
-            ts.Debug.assert(contentLengthText.indexOf(contentLengthPrefix) === 0, "Malformed response: Response text did not contain content-length header.");
-            var contentLength = parseInt(contentLengthText.substring(contentLengthPrefix.length));
-            // Read the body
-            var responseBody = lines[2];
-            // Verify content length
-            ts.Debug.assert(responseBody.length + 1 === contentLength, "Malformed response: Content length did not match the response's body length.");
-            return responseBody;
-        }
-        server.extractMessage = extractMessage;
-        var SessionClient = /** @class */ (function () {
-            function SessionClient(host) {
-                this.host = host;
-                this.sequence = 0;
-                this.lineMaps = ts.createMap();
-                this.messages = [];
-                this.getCombinedCodeFix = ts.notImplemented;
-                this.applyCodeActionCommand = ts.notImplemented;
-            }
-            SessionClient.prototype.onMessage = function (message) {
-                this.messages.push(message);
-            };
-            SessionClient.prototype.writeMessage = function (message) {
-                this.host.writeMessage(message);
-            };
-            SessionClient.prototype.getLineMap = function (fileName) {
-                var lineMap = this.lineMaps.get(fileName);
-                if (!lineMap) {
-                    lineMap = ts.computeLineStarts(ts.getSnapshotText(this.host.getScriptSnapshot(fileName)));
-                    this.lineMaps.set(fileName, lineMap);
-                }
-                return lineMap;
-            };
-            SessionClient.prototype.lineOffsetToPosition = function (fileName, lineOffset, lineMap) {
-                lineMap = lineMap || this.getLineMap(fileName);
-                return ts.computePositionOfLineAndCharacter(lineMap, lineOffset.line - 1, lineOffset.offset - 1);
-            };
-            SessionClient.prototype.positionToOneBasedLineOffset = function (fileName, position) {
-                var lineOffset = ts.computeLineAndCharacterOfPosition(this.getLineMap(fileName), position);
-                return {
-                    line: lineOffset.line + 1,
-                    offset: lineOffset.character + 1
-                };
-            };
-            SessionClient.prototype.convertCodeEditsToTextChange = function (fileName, codeEdit) {
-                return { span: this.decodeSpan(codeEdit, fileName), newText: codeEdit.newText };
-            };
-            SessionClient.prototype.processRequest = function (command, args) {
-                var request = {
-                    seq: this.sequence,
-                    type: "request",
-                    arguments: args,
-                    command: command
-                };
-                this.sequence++;
-                this.writeMessage(JSON.stringify(request));
-                return request;
-            };
-            SessionClient.prototype.processResponse = function (request) {
-                var foundResponseMessage = false;
-                var response;
-                while (!foundResponseMessage) {
-                    var lastMessage = this.messages.shift();
-                    ts.Debug.assert(!!lastMessage, "Did not receive any responses.");
-                    var responseBody = extractMessage(lastMessage);
-                    try {
-                        response = JSON.parse(responseBody);
-                        // the server may emit events before emitting the response. We
-                        // want to ignore these events for testing purpose.
-                        if (response.type === "response") {
-                            foundResponseMessage = true;
-                        }
-                    }
-                    catch (e) {
-                        throw new Error("Malformed response: Failed to parse server response: " + lastMessage + ". \r\n  Error details: " + e.message);
-                    }
-                }
-                // verify the sequence numbers
-                ts.Debug.assert(response.request_seq === request.seq, "Malformed response: response sequence number did not match request sequence number.");
-                // unmarshal errors
-                if (!response.success) {
-                    throw new Error("Error " + response.message);
-                }
-                ts.Debug.assert(!!response.body, "Malformed response: Unexpected empty response body.");
-                return response;
-            };
-            SessionClient.prototype.openFile = function (file, fileContent, scriptKindName) {
-                var args = { file: file, fileContent: fileContent, scriptKindName: scriptKindName };
-                this.processRequest(server.CommandNames.Open, args);
-            };
-            SessionClient.prototype.closeFile = function (file) {
-                var args = { file: file };
-                this.processRequest(server.CommandNames.Close, args);
-            };
-            SessionClient.prototype.changeFile = function (fileName, start, end, insertString) {
-                // clear the line map after an edit
-                this.lineMaps.set(fileName, undefined); // TODO: GH#18217
-                var args = __assign({}, this.createFileLocationRequestArgsWithEndLineAndOffset(fileName, start, end), { insertString: insertString });
-                this.processRequest(server.CommandNames.Change, args);
-            };
-            SessionClient.prototype.toLineColumnOffset = function (fileName, position) {
-                var _a = this.positionToOneBasedLineOffset(fileName, position), line = _a.line, offset = _a.offset;
-                return { line: line, character: offset };
-            };
-            SessionClient.prototype.getQuickInfoAtPosition = function (fileName, position) {
-                var args = this.createFileLocationRequestArgs(fileName, position);
-                var request = this.processRequest(server.CommandNames.Quickinfo, args);
-                var response = this.processResponse(request);
-                var body = response.body; // TODO: GH#18217
-                return {
-                    kind: body.kind,
-                    kindModifiers: body.kindModifiers,
-                    textSpan: this.decodeSpan(body, fileName),
-                    displayParts: [{ kind: "text", text: body.displayString }],
-                    documentation: [{ kind: "text", text: body.documentation }],
-                    tags: body.tags
-                };
-            };
-            SessionClient.prototype.getProjectInfo = function (file, needFileNameList) {
-                var args = { file: file, needFileNameList: needFileNameList };
-                var request = this.processRequest(server.CommandNames.ProjectInfo, args);
-                var response = this.processResponse(request);
-                return {
-                    configFileName: response.body.configFileName,
-                    fileNames: response.body.fileNames
-                };
-            };
-            SessionClient.prototype.getCompletionsAtPosition = function (fileName, position, _preferences) {
-                var _this = this;
-                // Not passing along 'preferences' because server should already have those from the 'configure' command
-                var args = this.createFileLocationRequestArgs(fileName, position);
-                var request = this.processRequest(server.CommandNames.Completions, args);
-                var response = this.processResponse(request);
-                return {
-                    isGlobalCompletion: false,
-                    isMemberCompletion: false,
-                    isNewIdentifierLocation: false,
-                    entries: response.body.map(function (entry) {
-                        if (entry.replacementSpan !== undefined) {
-                            var name = entry.name, kind = entry.kind, kindModifiers = entry.kindModifiers, sortText = entry.sortText, replacementSpan = entry.replacementSpan, hasAction = entry.hasAction, source = entry.source, isRecommended = entry.isRecommended;
-                            // TODO: GH#241
-                            var res = { name: name, kind: kind, kindModifiers: kindModifiers, sortText: sortText, replacementSpan: _this.decodeSpan(replacementSpan, fileName), hasAction: hasAction, source: source, isRecommended: isRecommended };
-                            return res;
-                        }
-                        return entry; // TODO: GH#18217
-                    })
-                };
-            };
-            SessionClient.prototype.getCompletionEntryDetails = function (fileName, position, entryName, _options, source) {
-                var _this = this;
-                var args = __assign({}, this.createFileLocationRequestArgs(fileName, position), { entryNames: [{ name: entryName, source: source }] });
-                var request = this.processRequest(server.CommandNames.CompletionDetails, args);
-                var response = this.processResponse(request);
-                ts.Debug.assert(response.body.length === 1, "Unexpected length of completion details response body.");
-                var convertedCodeActions = ts.map(response.body[0].codeActions, function (_a) {
-                    var description = _a.description, changes = _a.changes;
-                    return ({ description: description, changes: _this.convertChanges(changes, fileName) });
-                });
-                return __assign({}, response.body[0], { codeActions: convertedCodeActions });
-            };
-            SessionClient.prototype.getCompletionEntrySymbol = function (_fileName, _position, _entryName) {
-                return ts.notImplemented();
-            };
-            SessionClient.prototype.getNavigateToItems = function (searchValue) {
-                var _this = this;
-                var args = {
-                    searchValue: searchValue,
-                    file: this.host.getScriptFileNames()[0]
-                };
-                var request = this.processRequest(server.CommandNames.Navto, args);
-                var response = this.processResponse(request);
-                return response.body.map(function (entry) { return ({
-                    name: entry.name,
-                    containerName: entry.containerName || "",
-                    containerKind: entry.containerKind || "" /* unknown */,
-                    kind: entry.kind,
-                    kindModifiers: entry.kindModifiers,
-                    matchKind: entry.matchKind,
-                    isCaseSensitive: entry.isCaseSensitive,
-                    fileName: entry.file,
-                    textSpan: _this.decodeSpan(entry),
-                }); });
-            };
-            SessionClient.prototype.getFormattingEditsForRange = function (file, start, end, _options) {
-                var _this = this;
-                var args = this.createFileLocationRequestArgsWithEndLineAndOffset(file, start, end);
-                // TODO: handle FormatCodeOptions
-                var request = this.processRequest(server.CommandNames.Format, args);
-                var response = this.processResponse(request);
-                return response.body.map(function (entry) { return _this.convertCodeEditsToTextChange(file, entry); }); // TODO: GH#18217
-            };
-            SessionClient.prototype.getFormattingEditsForDocument = function (fileName, options) {
-                return this.getFormattingEditsForRange(fileName, 0, this.host.getScriptSnapshot(fileName).getLength(), options);
-            };
-            SessionClient.prototype.getFormattingEditsAfterKeystroke = function (fileName, position, key, _options) {
-                var _this = this;
-                var args = __assign({}, this.createFileLocationRequestArgs(fileName, position), { key: key });
-                // TODO: handle FormatCodeOptions
-                var request = this.processRequest(server.CommandNames.Formatonkey, args);
-                var response = this.processResponse(request);
-                return response.body.map(function (entry) { return _this.convertCodeEditsToTextChange(fileName, entry); }); // TODO: GH#18217
-            };
-            SessionClient.prototype.getDefinitionAtPosition = function (fileName, position) {
-                var _this = this;
-                var args = this.createFileLocationRequestArgs(fileName, position);
-                var request = this.processRequest(server.CommandNames.Definition, args);
-                var response = this.processResponse(request);
-                return response.body.map(function (entry) { return ({
-                    containerKind: "" /* unknown */,
-                    containerName: "",
-                    fileName: entry.file,
-                    textSpan: _this.decodeSpan(entry),
-                    kind: "" /* unknown */,
-                    name: ""
-                }); });
-            };
-            SessionClient.prototype.getDefinitionAndBoundSpan = function (fileName, position) {
-                var _this = this;
-                var args = this.createFileLocationRequestArgs(fileName, position);
-                var request = this.processRequest(server.CommandNames.DefinitionAndBoundSpan, args);
-                var response = this.processResponse(request);
-                return {
-                    definitions: response.body.definitions.map(function (entry) { return ({
-                        containerKind: "" /* unknown */,
-                        containerName: "",
-                        fileName: entry.file,
-                        textSpan: _this.decodeSpan(entry),
-                        kind: "" /* unknown */,
-                        name: ""
-                    }); }),
-                    textSpan: this.decodeSpan(response.body.textSpan, request.arguments.file)
-                };
-            };
-            SessionClient.prototype.getTypeDefinitionAtPosition = function (fileName, position) {
-                var _this = this;
-                var args = this.createFileLocationRequestArgs(fileName, position);
-                var request = this.processRequest(server.CommandNames.TypeDefinition, args);
-                var response = this.processResponse(request);
-                return response.body.map(function (entry) { return ({
-                    containerKind: "" /* unknown */,
-                    containerName: "",
-                    fileName: entry.file,
-                    textSpan: _this.decodeSpan(entry),
-                    kind: "" /* unknown */,
-                    name: ""
-                }); });
-            };
-            SessionClient.prototype.getImplementationAtPosition = function (fileName, position) {
-                var _this = this;
-                var args = this.createFileLocationRequestArgs(fileName, position);
-                var request = this.processRequest(server.CommandNames.Implementation, args);
-                var response = this.processResponse(request);
-                return response.body.map(function (entry) { return ({
-                    fileName: entry.file,
-                    textSpan: _this.decodeSpan(entry),
-                    kind: "" /* unknown */,
-                    displayParts: []
-                }); });
-            };
-            SessionClient.prototype.findReferences = function (_fileName, _position) {
-                // Not yet implemented.
-                return [];
-            };
-            SessionClient.prototype.getReferencesAtPosition = function (fileName, position) {
-                var _this = this;
-                var args = this.createFileLocationRequestArgs(fileName, position);
-                var request = this.processRequest(server.CommandNames.References, args);
-                var response = this.processResponse(request);
-                return response.body.refs.map(function (entry) { return ({
-                    fileName: entry.file,
-                    textSpan: _this.decodeSpan(entry),
-                    isWriteAccess: entry.isWriteAccess,
-                    isDefinition: entry.isDefinition,
-                }); });
-            };
-            SessionClient.prototype.getEmitOutput = function (_fileName) {
-                return ts.notImplemented();
-            };
-            SessionClient.prototype.getSyntacticDiagnostics = function (file) {
-                return this.getDiagnostics(file, server.CommandNames.SyntacticDiagnosticsSync);
-            };
-            SessionClient.prototype.getSemanticDiagnostics = function (file) {
-                return this.getDiagnostics(file, server.CommandNames.SemanticDiagnosticsSync);
-            };
-            SessionClient.prototype.getSuggestionDiagnostics = function (file) {
-                return this.getDiagnostics(file, server.CommandNames.SuggestionDiagnosticsSync);
-            };
-            SessionClient.prototype.getDiagnostics = function (file, command) {
-                var request = this.processRequest(command, { file: file, includeLinePosition: true });
-                var response = this.processResponse(request);
-                return response.body.map(function (entry) {
-                    var category = ts.firstDefined(Object.keys(ts.DiagnosticCategory), function (id) {
-                        return ts.isString(id) && entry.category === id.toLowerCase() ? ts.DiagnosticCategory[id] : undefined;
-                    });
-                    return {
-                        file: undefined,
-                        start: entry.start,
-                        length: entry.length,
-                        messageText: entry.message,
-                        category: ts.Debug.assertDefined(category, "convertDiagnostic: category should not be undefined"),
-                        code: entry.code,
-                        reportsUnnecessary: entry.reportsUnnecessary,
-                    };
-                });
-            };
-            SessionClient.prototype.getCompilerOptionsDiagnostics = function () {
-                return ts.notImplemented();
-            };
-            SessionClient.prototype.getRenameInfo = function (fileName, position, findInStrings, findInComments) {
-                var args = __assign({}, this.createFileLocationRequestArgs(fileName, position), { findInStrings: findInStrings, findInComments: findInComments });
-                var request = this.processRequest(server.CommandNames.Rename, args);
-                var response = this.processResponse(request);
-                var body = response.body; // TODO: GH#18217
-                var locations = [];
-                for (var _i = 0, _a = body.locs; _i < _a.length; _i++) {
-                    var entry = _a[_i];
-                    var fileName_1 = entry.file;
-                    for (var _b = 0, _c = entry.locs; _b < _c.length; _b++) {
-                        var loc = _c[_b];
-                        locations.push({ textSpan: this.decodeSpan(loc, fileName_1), fileName: fileName_1 });
-                    }
-                }
-                return this.lastRenameEntry = {
-                    canRename: body.info.canRename,
-                    displayName: body.info.displayName,
-                    fullDisplayName: body.info.fullDisplayName,
-                    kind: body.info.kind,
-                    kindModifiers: body.info.kindModifiers,
-                    localizedErrorMessage: body.info.localizedErrorMessage,
-                    triggerSpan: ts.createTextSpanFromBounds(position, position),
-                    fileName: fileName,
-                    position: position,
-                    findInStrings: !!findInStrings,
-                    findInComments: !!findInComments,
-                    locations: locations,
-                };
-            };
-            SessionClient.prototype.findRenameLocations = function (fileName, position, findInStrings, findInComments) {
-                if (!this.lastRenameEntry ||
-                    this.lastRenameEntry.fileName !== fileName ||
-                    this.lastRenameEntry.position !== position ||
-                    this.lastRenameEntry.findInStrings !== findInStrings ||
-                    this.lastRenameEntry.findInComments !== findInComments) {
-                    this.getRenameInfo(fileName, position, findInStrings, findInComments);
-                }
-                return this.lastRenameEntry.locations;
-            };
-            SessionClient.prototype.decodeNavigationBarItems = function (items, fileName, lineMap) {
-                var _this = this;
-                if (!items) {
-                    return [];
-                }
-                return items.map(function (item) { return ({
-                    text: item.text,
-                    kind: item.kind,
-                    kindModifiers: item.kindModifiers || "",
-                    spans: item.spans.map(function (span) { return _this.decodeSpan(span, fileName, lineMap); }),
-                    childItems: _this.decodeNavigationBarItems(item.childItems, fileName, lineMap),
-                    indent: item.indent,
-                    bolded: false,
-                    grayed: false
-                }); });
-            };
-            SessionClient.prototype.getNavigationBarItems = function (file) {
-                var request = this.processRequest(server.CommandNames.NavBar, { file: file });
-                var response = this.processResponse(request);
-                var lineMap = this.getLineMap(file);
-                return this.decodeNavigationBarItems(response.body, file, lineMap);
-            };
-            SessionClient.prototype.decodeNavigationTree = function (tree, fileName, lineMap) {
-                var _this = this;
-                return {
-                    text: tree.text,
-                    kind: tree.kind,
-                    kindModifiers: tree.kindModifiers,
-                    spans: tree.spans.map(function (span) { return _this.decodeSpan(span, fileName, lineMap); }),
-                    nameSpan: tree.nameSpan && this.decodeSpan(tree.nameSpan, fileName, lineMap),
-                    childItems: ts.map(tree.childItems, function (item) { return _this.decodeNavigationTree(item, fileName, lineMap); })
-                };
-            };
-            SessionClient.prototype.getNavigationTree = function (file) {
-                var request = this.processRequest(server.CommandNames.NavTree, { file: file });
-                var response = this.processResponse(request);
-                var lineMap = this.getLineMap(file);
-                return this.decodeNavigationTree(response.body, file, lineMap); // TODO: GH#18217
-            };
-            SessionClient.prototype.decodeSpan = function (span, fileName, lineMap) {
-                fileName = fileName || span.file;
-                lineMap = lineMap || this.getLineMap(fileName);
-                return ts.createTextSpanFromBounds(this.lineOffsetToPosition(fileName, span.start, lineMap), this.lineOffsetToPosition(fileName, span.end, lineMap));
-            };
-            SessionClient.prototype.getNameOrDottedNameSpan = function (_fileName, _startPos, _endPos) {
-                return ts.notImplemented();
-            };
-            SessionClient.prototype.getBreakpointStatementAtPosition = function (_fileName, _position) {
-                return ts.notImplemented();
-            };
-            SessionClient.prototype.getSignatureHelpItems = function (fileName, position) {
-                var args = this.createFileLocationRequestArgs(fileName, position);
-                var request = this.processRequest(server.CommandNames.SignatureHelp, args);
-                var response = this.processResponse(request);
-                if (!response.body) {
-                    return undefined; // TODO: GH#18217
-                }
-                var _a = response.body, items = _a.items, encodedApplicableSpan = _a.applicableSpan, selectedItemIndex = _a.selectedItemIndex, argumentIndex = _a.argumentIndex, argumentCount = _a.argumentCount;
-                var applicableSpan = this.decodeSpan(encodedApplicableSpan, fileName);
-                return { items: items, applicableSpan: applicableSpan, selectedItemIndex: selectedItemIndex, argumentIndex: argumentIndex, argumentCount: argumentCount };
-            };
-            SessionClient.prototype.getOccurrencesAtPosition = function (fileName, position) {
-                var _this = this;
-                var args = this.createFileLocationRequestArgs(fileName, position);
-                var request = this.processRequest(server.CommandNames.Occurrences, args);
-                var response = this.processResponse(request);
-                return response.body.map(function (entry) { return ({
-                    fileName: entry.file,
-                    textSpan: _this.decodeSpan(entry),
-                    isWriteAccess: entry.isWriteAccess,
-                    isDefinition: false
-                }); });
-            };
-            SessionClient.prototype.getDocumentHighlights = function (fileName, position, filesToSearch) {
-                var _this = this;
-                var args = __assign({}, this.createFileLocationRequestArgs(fileName, position), { filesToSearch: filesToSearch });
-                var request = this.processRequest(server.CommandNames.DocumentHighlights, args);
-                var response = this.processResponse(request);
-                return response.body.map(function (item) { return ({
-                    fileName: item.file,
-                    highlightSpans: item.highlightSpans.map(function (span) { return ({
-                        textSpan: _this.decodeSpan(span, item.file),
-                        kind: span.kind
-                    }); }),
-                }); });
-            };
-            SessionClient.prototype.getOutliningSpans = function (file) {
-                var _this = this;
-                var request = this.processRequest(server.CommandNames.GetOutliningSpans, { file: file });
-                var response = this.processResponse(request);
-                return response.body.map(function (item) { return ({
-                    textSpan: _this.decodeSpan(item.textSpan, file),
-                    hintSpan: _this.decodeSpan(item.hintSpan, file),
-                    bannerText: item.bannerText,
-                    autoCollapse: item.autoCollapse,
-                    kind: item.kind
-                }); });
-            };
-            SessionClient.prototype.getTodoComments = function (_fileName, _descriptors) {
-                return ts.notImplemented();
-            };
-            SessionClient.prototype.getDocCommentTemplateAtPosition = function (_fileName, _position) {
-                return ts.notImplemented();
-            };
-            SessionClient.prototype.isValidBraceCompletionAtPosition = function (_fileName, _position, _openingBrace) {
-                return ts.notImplemented();
-            };
-            SessionClient.prototype.getJsxClosingTagAtPosition = function (_fileName, _position) {
-                return ts.notImplemented();
-            };
-            SessionClient.prototype.getSpanOfEnclosingComment = function (_fileName, _position, _onlyMultiLine) {
-                return ts.notImplemented();
-            };
-            SessionClient.prototype.getCodeFixesAtPosition = function (file, start, end, errorCodes) {
-                var _this = this;
-                var args = __assign({}, this.createFileRangeRequestArgs(file, start, end), { errorCodes: errorCodes });
-                var request = this.processRequest(server.CommandNames.GetCodeFixes, args);
-                var response = this.processResponse(request);
-                return response.body.map(function (_a) {
-                    var fixName = _a.fixName, description = _a.description, changes = _a.changes, commands = _a.commands, fixId = _a.fixId, fixAllDescription = _a.fixAllDescription;
-                    return ({ fixName: fixName, description: description, changes: _this.convertChanges(changes, file), commands: commands, fixId: fixId, fixAllDescription: fixAllDescription });
-                });
-            };
-            SessionClient.prototype.createFileLocationOrRangeRequestArgs = function (positionOrRange, fileName) {
-                return typeof positionOrRange === "number"
-                    ? this.createFileLocationRequestArgs(fileName, positionOrRange)
-                    : this.createFileRangeRequestArgs(fileName, positionOrRange.pos, positionOrRange.end);
-            };
-            SessionClient.prototype.createFileLocationRequestArgs = function (file, position) {
-                var _a = this.positionToOneBasedLineOffset(file, position), line = _a.line, offset = _a.offset;
-                return { file: file, line: line, offset: offset };
-            };
-            SessionClient.prototype.createFileRangeRequestArgs = function (file, start, end) {
-                var _a = this.positionToOneBasedLineOffset(file, start), startLine = _a.line, startOffset = _a.offset;
-                var _b = this.positionToOneBasedLineOffset(file, end), endLine = _b.line, endOffset = _b.offset;
-                return { file: file, startLine: startLine, startOffset: startOffset, endLine: endLine, endOffset: endOffset };
-            };
-            SessionClient.prototype.createFileLocationRequestArgsWithEndLineAndOffset = function (file, start, end) {
-                var _a = this.positionToOneBasedLineOffset(file, start), line = _a.line, offset = _a.offset;
-                var _b = this.positionToOneBasedLineOffset(file, end), endLine = _b.line, endOffset = _b.offset;
-                return { file: file, line: line, offset: offset, endLine: endLine, endOffset: endOffset };
-            };
-            SessionClient.prototype.getApplicableRefactors = function (fileName, positionOrRange) {
-                var args = this.createFileLocationOrRangeRequestArgs(positionOrRange, fileName);
-                var request = this.processRequest(server.CommandNames.GetApplicableRefactors, args);
-                var response = this.processResponse(request);
-                return response.body; // TODO: GH#18217
-            };
-            SessionClient.prototype.getEditsForRefactor = function (fileName, _formatOptions, positionOrRange, refactorName, actionName) {
-                var args = this.createFileLocationOrRangeRequestArgs(positionOrRange, fileName);
-                args.refactor = refactorName;
-                args.action = actionName;
-                var request = this.processRequest(server.CommandNames.GetEditsForRefactor, args);
-                var response = this.processResponse(request);
-                if (!response.body) {
-                    return { edits: [], renameFilename: undefined, renameLocation: undefined };
-                }
-                var edits = this.convertCodeEditsToTextChanges(response.body.edits);
-                var renameFilename = response.body.renameFilename;
-                var renameLocation;
-                if (renameFilename !== undefined) {
-                    renameLocation = this.lineOffsetToPosition(renameFilename, response.body.renameLocation); // TODO: GH#18217
-                }
-                return {
-                    edits: edits,
-                    renameFilename: renameFilename,
-                    renameLocation: renameLocation
-                };
-            };
-            SessionClient.prototype.organizeImports = function (_scope, _formatOptions) {
-                return ts.notImplemented();
-            };
-            SessionClient.prototype.getEditsForFileRename = function () {
-                return ts.notImplemented();
-            };
-            SessionClient.prototype.convertCodeEditsToTextChanges = function (edits) {
-                var _this = this;
-                return edits.map(function (edit) {
-                    var fileName = edit.fileName;
-                    return {
-                        fileName: fileName,
-                        textChanges: edit.textChanges.map(function (t) { return _this.convertTextChangeToCodeEdit(t, fileName); })
-                    };
-                });
-            };
-            SessionClient.prototype.convertChanges = function (changes, fileName) {
-                var _this = this;
-                return changes.map(function (change) { return ({
-                    fileName: change.fileName,
-                    textChanges: change.textChanges.map(function (textChange) { return _this.convertTextChangeToCodeEdit(textChange, fileName); })
-                }); });
-            };
-            SessionClient.prototype.convertTextChangeToCodeEdit = function (change, fileName) {
-                return {
-                    span: this.decodeSpan(change, fileName),
-                    newText: change.newText ? change.newText : ""
-                };
-            };
-            SessionClient.prototype.getBraceMatchingAtPosition = function (fileName, position) {
-                var _this = this;
-                var args = this.createFileLocationRequestArgs(fileName, position);
-                var request = this.processRequest(server.CommandNames.Brace, args);
-                var response = this.processResponse(request);
-                return response.body.map(function (entry) { return _this.decodeSpan(entry, fileName); }); // TODO: GH#18217
-            };
-            SessionClient.prototype.getIndentationAtPosition = function (_fileName, _position, _options) {
-                return ts.notImplemented();
-            };
-            SessionClient.prototype.getSyntacticClassifications = function (_fileName, _span) {
-                return ts.notImplemented();
-            };
-            SessionClient.prototype.getSemanticClassifications = function (_fileName, _span) {
-                return ts.notImplemented();
-            };
-            SessionClient.prototype.getEncodedSyntacticClassifications = function (_fileName, _span) {
-                return ts.notImplemented();
-            };
-            SessionClient.prototype.getEncodedSemanticClassifications = function (_fileName, _span) {
-                return ts.notImplemented();
-            };
-            SessionClient.prototype.getProgram = function () {
-                throw new Error("SourceFile objects are not serializable through the server protocol.");
-            };
-            SessionClient.prototype.getNonBoundSourceFile = function (_fileName) {
-                throw new Error("SourceFile objects are not serializable through the server protocol.");
-            };
-            SessionClient.prototype.getSourceFile = function (_fileName) {
-                throw new Error("SourceFile objects are not serializable through the server protocol.");
-            };
-            SessionClient.prototype.cleanupSemanticCache = function () {
-                throw new Error("cleanupSemanticCache is not available through the server layer.");
-            };
-            SessionClient.prototype.dispose = function () {
-                throw new Error("dispose is not available through the server layer.");
-            };
-            return SessionClient;
-        }());
-        server.SessionClient = SessionClient;
-    })(server = ts.server || (ts.server = {}));
-})(ts || (ts = {}));
-var RunnerBase = /** @class */ (function () {
-    function RunnerBase() {
-        // contains the tests to run
-        this.tests = [];
-        /** The working directory where tests are found. Needed for batch testing where the input path will differ from the output path inside baselines */
-        this.workingDirectory = "";
-    }
-    /** Add a source file to the runner's list of tests that need to be initialized with initializeTests */
-    RunnerBase.prototype.addTest = function (fileName) {
-        this.tests.push(fileName);
-    };
-    RunnerBase.prototype.enumerateFiles = function (folder, regex, options) {
-        return ts.map(Harness.IO.listFiles(Harness.userSpecifiedRoot + folder, regex, { recursive: (options ? options.recursive : false) }), ts.normalizeSlashes);
-    };
-    /** Replaces instances of full paths with fileNames only */
-    RunnerBase.removeFullPaths = function (path) {
-        // If its a full path (starts with "C:" or "/") replace with just the filename
-        var fixedPath = /^(\w:|\/)/.test(path) ? ts.getBaseFileName(path) : path;
-        // when running in the browser the 'full path' is the host name, shows up in error baselines
-        var localHost = /http:\/localhost:\d+/g;
-        fixedPath = fixedPath.replace(localHost, "");
-        return fixedPath;
-    };
-    return RunnerBase;
-}());
-var Harness;
-(function (Harness) {
-    var SourceMapRecorder;
-    (function (SourceMapRecorder) {
-        var SourceMapDecoder;
-        (function (SourceMapDecoder) {
-            var sourceMapMappings;
-            var sourceMapNames;
-            var decodingIndex;
-            var prevNameIndex;
-            var decodeOfEncodedMapping;
-            var errorDecodeOfEncodedMapping;
-            function initializeSourceMapDecoding(sourceMapData) {
-                sourceMapMappings = sourceMapData.sourceMapMappings;
-                sourceMapNames = sourceMapData.sourceMapNames;
-                decodingIndex = 0;
-                prevNameIndex = 0;
-                decodeOfEncodedMapping = {
-                    emittedLine: 1,
-                    emittedColumn: 1,
-                    sourceLine: 1,
-                    sourceColumn: 1,
-                    sourceIndex: 0,
-                };
-                errorDecodeOfEncodedMapping = undefined;
-            }
-            SourceMapDecoder.initializeSourceMapDecoding = initializeSourceMapDecoding;
-            function isSourceMappingSegmentEnd() {
-                if (decodingIndex === sourceMapMappings.length) {
-                    return true;
-                }
-                if (sourceMapMappings.charAt(decodingIndex) === ",") {
-                    return true;
-                }
-                if (sourceMapMappings.charAt(decodingIndex) === ";") {
-                    return true;
-                }
-                return false;
-            }
-            function decodeNextEncodedSourceMapSpan() {
-                errorDecodeOfEncodedMapping = undefined;
-                function createErrorIfCondition(condition, errormsg) {
-                    if (errorDecodeOfEncodedMapping) {
-                        // there was existing error:
-                        return true;
-                    }
-                    if (condition) {
-                        errorDecodeOfEncodedMapping = errormsg;
-                    }
-                    return condition;
-                }
-                function base64VLQFormatDecode() {
-                    function base64FormatDecode() {
-                        return "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".indexOf(sourceMapMappings.charAt(decodingIndex));
-                    }
-                    var moreDigits = true;
-                    var shiftCount = 0;
-                    var value = 0;
-                    for (; moreDigits; decodingIndex++) {
-                        if (createErrorIfCondition(decodingIndex >= sourceMapMappings.length, "Error in decoding base64VLQFormatDecode, past the mapping string")) {
-                            return undefined; // TODO: GH#18217
-                        }
-                        // 6 digit number
-                        var currentByte = base64FormatDecode();
-                        // If msb is set, we still have more bits to continue
-                        moreDigits = (currentByte & 32) !== 0;
-                        // least significant 5 bits are the next msbs in the final value.
-                        value = value | ((currentByte & 31) << shiftCount);
-                        shiftCount += 5;
-                    }
-                    // Least significant bit if 1 represents negative and rest of the msb is actual absolute value
-                    if ((value & 1) === 0) {
-                        // + number
-                        value = value >> 1;
-                    }
-                    else {
-                        // - number
-                        value = value >> 1;
-                        value = -value;
-                    }
-                    return value;
-                }
-                while (decodingIndex < sourceMapMappings.length) {
-                    if (sourceMapMappings.charAt(decodingIndex) === ";") {
-                        // New line
-                        decodeOfEncodedMapping.emittedLine++;
-                        decodeOfEncodedMapping.emittedColumn = 1;
-                        decodingIndex++;
-                        continue;
-                    }
-                    if (sourceMapMappings.charAt(decodingIndex) === ",") {
-                        // Next entry is on same line - no action needed
-                        decodingIndex++;
-                        continue;
-                    }
-                    // Read the current span
-                    // 1. Column offset from prev read jsColumn
-                    decodeOfEncodedMapping.emittedColumn += base64VLQFormatDecode();
-                    // Incorrect emittedColumn dont support this map
-                    if (createErrorIfCondition(decodeOfEncodedMapping.emittedColumn < 1, "Invalid emittedColumn found")) {
-                        return { error: errorDecodeOfEncodedMapping, sourceMapSpan: decodeOfEncodedMapping };
-                    }
-                    // Dont support reading mappings that dont have information about original source and its line numbers
-                    if (createErrorIfCondition(isSourceMappingSegmentEnd(), "Unsupported Error Format: No entries after emitted column")) {
-                        return { error: errorDecodeOfEncodedMapping, sourceMapSpan: decodeOfEncodedMapping };
-                    }
-                    // 2. Relative sourceIndex
-                    decodeOfEncodedMapping.sourceIndex += base64VLQFormatDecode();
-                    // Incorrect sourceIndex dont support this map
-                    if (createErrorIfCondition(decodeOfEncodedMapping.sourceIndex < 0, "Invalid sourceIndex found")) {
-                        return { error: errorDecodeOfEncodedMapping, sourceMapSpan: decodeOfEncodedMapping };
-                    }
-                    // Dont support reading mappings that dont have information about original source span
-                    if (createErrorIfCondition(isSourceMappingSegmentEnd(), "Unsupported Error Format: No entries after sourceIndex")) {
-                        return { error: errorDecodeOfEncodedMapping, sourceMapSpan: decodeOfEncodedMapping };
-                    }
-                    // 3. Relative sourceLine 0 based
-                    decodeOfEncodedMapping.sourceLine += base64VLQFormatDecode();
-                    // Incorrect sourceLine dont support this map
-                    if (createErrorIfCondition(decodeOfEncodedMapping.sourceLine < 1, "Invalid sourceLine found")) {
-                        return { error: errorDecodeOfEncodedMapping, sourceMapSpan: decodeOfEncodedMapping };
-                    }
-                    // Dont support reading mappings that dont have information about original source and its line numbers
-                    if (createErrorIfCondition(isSourceMappingSegmentEnd(), "Unsupported Error Format: No entries after emitted Line")) {
-                        return { error: errorDecodeOfEncodedMapping, sourceMapSpan: decodeOfEncodedMapping };
-                    }
-                    // 4. Relative sourceColumn 0 based
-                    decodeOfEncodedMapping.sourceColumn += base64VLQFormatDecode();
-                    // Incorrect sourceColumn dont support this map
-                    if (createErrorIfCondition(decodeOfEncodedMapping.sourceColumn < 1, "Invalid sourceLine found")) {
-                        return { error: errorDecodeOfEncodedMapping, sourceMapSpan: decodeOfEncodedMapping };
-                    }
-                    // 5. Check if there is name:
-                    if (!isSourceMappingSegmentEnd()) {
-                        prevNameIndex += base64VLQFormatDecode();
-                        decodeOfEncodedMapping.nameIndex = prevNameIndex;
-                        // Incorrect nameIndex dont support this map
-                        if (createErrorIfCondition(decodeOfEncodedMapping.nameIndex < 0 || decodeOfEncodedMapping.nameIndex >= sourceMapNames.length, "Invalid name index for the source map entry")) {
-                            return { error: errorDecodeOfEncodedMapping, sourceMapSpan: decodeOfEncodedMapping };
-                        }
-                    }
-                    // Dont support reading mappings that dont have information about original source and its line numbers
-                    if (createErrorIfCondition(!isSourceMappingSegmentEnd(), "Unsupported Error Format: There are more entries after " + (decodeOfEncodedMapping.nameIndex === -1 ? "sourceColumn" : "nameIndex"))) {
-                        return { error: errorDecodeOfEncodedMapping, sourceMapSpan: decodeOfEncodedMapping };
-                    }
-                    // Populated the entry
-                    return { error: errorDecodeOfEncodedMapping, sourceMapSpan: decodeOfEncodedMapping };
-                }
-                createErrorIfCondition(/*condition*/ true, "No encoded entry found");
-                return undefined; // TODO: GH#18217
-            }
-            SourceMapDecoder.decodeNextEncodedSourceMapSpan = decodeNextEncodedSourceMapSpan;
-            function hasCompletedDecoding() {
-                return decodingIndex === sourceMapMappings.length;
-            }
-            SourceMapDecoder.hasCompletedDecoding = hasCompletedDecoding;
-            function getRemainingDecodeString() {
-                return sourceMapMappings.substr(decodingIndex);
-            }
-            SourceMapDecoder.getRemainingDecodeString = getRemainingDecodeString;
-        })(SourceMapDecoder || (SourceMapDecoder = {}));
-        var SourceMapSpanWriter;
-        (function (SourceMapSpanWriter) {
-            var sourceMapRecorder;
-            var sourceMapSources;
-            var sourceMapNames;
-            var jsFile;
-            var jsLineMap;
-            var tsCode;
-            var tsLineMap;
-            var spansOnSingleLine;
-            var prevWrittenSourcePos;
-            var prevWrittenJsLine;
-            var spanMarkerContinues;
-            function initializeSourceMapSpanWriter(sourceMapRecordWriter, sourceMapData, currentJsFile) {
-                sourceMapRecorder = sourceMapRecordWriter;
-                sourceMapSources = sourceMapData.sourceMapSources;
-                sourceMapNames = sourceMapData.sourceMapNames;
-                jsFile = currentJsFile;
-                jsLineMap = jsFile.lineStarts;
-                spansOnSingleLine = [];
-                prevWrittenSourcePos = 0;
-                prevWrittenJsLine = 0;
-                spanMarkerContinues = false;
-                SourceMapDecoder.initializeSourceMapDecoding(sourceMapData);
-                sourceMapRecorder.WriteLine("===================================================================");
-                sourceMapRecorder.WriteLine("JsFile: " + sourceMapData.sourceMapFile);
-                sourceMapRecorder.WriteLine("mapUrl: " + sourceMapData.jsSourceMappingURL);
-                sourceMapRecorder.WriteLine("sourceRoot: " + sourceMapData.sourceMapSourceRoot);
-                sourceMapRecorder.WriteLine("sources: " + sourceMapData.sourceMapSources);
-                if (sourceMapData.sourceMapSourcesContent) {
-                    sourceMapRecorder.WriteLine("sourcesContent: " + JSON.stringify(sourceMapData.sourceMapSourcesContent));
-                }
-                sourceMapRecorder.WriteLine("===================================================================");
-            }
-            SourceMapSpanWriter.initializeSourceMapSpanWriter = initializeSourceMapSpanWriter;
-            function getSourceMapSpanString(mapEntry, getAbsentNameIndex) {
-                var mapString = "Emitted(" + mapEntry.emittedLine + ", " + mapEntry.emittedColumn + ") Source(" + mapEntry.sourceLine + ", " + mapEntry.sourceColumn + ") + SourceIndex(" + mapEntry.sourceIndex + ")";
-                if (mapEntry.nameIndex >= 0 && mapEntry.nameIndex < sourceMapNames.length) {
-                    mapString += " name (" + sourceMapNames[mapEntry.nameIndex] + ")";
-                }
-                else {
-                    if ((mapEntry.nameIndex && mapEntry.nameIndex !== -1) || getAbsentNameIndex) {
-                        mapString += " nameIndex (" + mapEntry.nameIndex + ")";
-                    }
-                }
-                return mapString;
-            }
-            function recordSourceMapSpan(sourceMapSpan) {
-                // verify the decoded span is same as the new span
-                var decodeResult = SourceMapDecoder.decodeNextEncodedSourceMapSpan();
-                var decodeErrors;
-                if (decodeResult.error
-                    || decodeResult.sourceMapSpan.emittedLine !== sourceMapSpan.emittedLine
-                    || decodeResult.sourceMapSpan.emittedColumn !== sourceMapSpan.emittedColumn
-                    || decodeResult.sourceMapSpan.sourceLine !== sourceMapSpan.sourceLine
-                    || decodeResult.sourceMapSpan.sourceColumn !== sourceMapSpan.sourceColumn
-                    || decodeResult.sourceMapSpan.sourceIndex !== sourceMapSpan.sourceIndex
-                    || decodeResult.sourceMapSpan.nameIndex !== sourceMapSpan.nameIndex) {
-                    if (decodeResult.error) {
-                        decodeErrors = ["!!^^ !!^^ There was decoding error in the sourcemap at this location: " + decodeResult.error];
-                    }
-                    else {
-                        decodeErrors = ["!!^^ !!^^ The decoded span from sourcemap's mapping entry does not match what was encoded for this span:"];
-                    }
-                    decodeErrors.push("!!^^ !!^^ Decoded span from sourcemap's mappings entry: " + getSourceMapSpanString(decodeResult.sourceMapSpan, /*getAbsentNameIndex*/ true) + " Span encoded by the emitter:" + getSourceMapSpanString(sourceMapSpan, /*getAbsentNameIndex*/ true));
-                }
-                if (spansOnSingleLine.length && spansOnSingleLine[0].sourceMapSpan.emittedLine !== sourceMapSpan.emittedLine) {
-                    // On different line from the one that we have been recording till now,
-                    writeRecordedSpans();
-                    spansOnSingleLine = [];
-                }
-                spansOnSingleLine.push({ sourceMapSpan: sourceMapSpan, decodeErrors: decodeErrors });
-            }
-            SourceMapSpanWriter.recordSourceMapSpan = recordSourceMapSpan;
-            function recordNewSourceFileSpan(sourceMapSpan, newSourceFileCode) {
-                assert.isTrue(spansOnSingleLine.length === 0 || spansOnSingleLine[0].sourceMapSpan.emittedLine !== sourceMapSpan.emittedLine, "new file source map span should be on new line. We currently handle only that scenario");
-                recordSourceMapSpan(sourceMapSpan);
-                assert.isTrue(spansOnSingleLine.length === 1);
-                sourceMapRecorder.WriteLine("-------------------------------------------------------------------");
-                sourceMapRecorder.WriteLine("emittedFile:" + jsFile.file);
-                sourceMapRecorder.WriteLine("sourceFile:" + sourceMapSources[spansOnSingleLine[0].sourceMapSpan.sourceIndex]);
-                sourceMapRecorder.WriteLine("-------------------------------------------------------------------");
-                tsLineMap = ts.computeLineStarts(newSourceFileCode);
-                tsCode = newSourceFileCode;
-                prevWrittenSourcePos = 0;
-            }
-            SourceMapSpanWriter.recordNewSourceFileSpan = recordNewSourceFileSpan;
-            function close() {
-                // Write the lines pending on the single line
-                writeRecordedSpans();
-                if (!SourceMapDecoder.hasCompletedDecoding()) {
-                    sourceMapRecorder.WriteLine("!!!! **** There are more source map entries in the sourceMap's mapping than what was encoded");
-                    sourceMapRecorder.WriteLine("!!!! **** Remaining decoded string: " + SourceMapDecoder.getRemainingDecodeString());
-                }
-                // write remaining js lines
-                writeJsFileLines(jsLineMap.length);
-            }
-            SourceMapSpanWriter.close = close;
-            function getTextOfLine(line, lineMap, code) {
-                var startPos = lineMap[line];
-                var endPos = lineMap[line + 1];
-                var text = code.substring(startPos, endPos);
-                return line === 0 ? utils.removeByteOrderMark(text) : text;
-            }
-            function writeJsFileLines(endJsLine) {
-                for (; prevWrittenJsLine < endJsLine; prevWrittenJsLine++) {
-                    sourceMapRecorder.Write(">>>" + getTextOfLine(prevWrittenJsLine, jsLineMap, jsFile.text));
-                }
-            }
-            function writeRecordedSpans() {
-                var markerIds = [];
-                function getMarkerId(markerIndex) {
-                    var markerId = "";
-                    if (spanMarkerContinues) {
-                        assert.isTrue(markerIndex === 0);
-                        markerId = "1->";
-                    }
-                    else {
-                        markerId = "" + (markerIndex + 1);
-                        if (markerId.length < 2) {
-                            markerId = markerId + " ";
-                        }
-                        markerId += ">";
-                    }
-                    return markerId;
-                }
-                var prevEmittedCol;
-                function iterateSpans(fn) {
-                    prevEmittedCol = 1;
-                    for (var i = 0; i < spansOnSingleLine.length; i++) {
-                        fn(spansOnSingleLine[i], i);
-                        prevEmittedCol = spansOnSingleLine[i].sourceMapSpan.emittedColumn;
-                    }
-                }
-                function writeSourceMapIndent(indentLength, indentPrefix) {
-                    sourceMapRecorder.Write(indentPrefix);
-                    for (var i = 1; i < indentLength; i++) {
-                        sourceMapRecorder.Write(" ");
-                    }
-                }
-                function writeSourceMapMarker(currentSpan, index, endColumn, endContinues) {
-                    if (endColumn === void 0) { endColumn = currentSpan.sourceMapSpan.emittedColumn; }
-                    if (endContinues === void 0) { endContinues = false; }
-                    var markerId = getMarkerId(index);
-                    markerIds.push(markerId);
-                    writeSourceMapIndent(prevEmittedCol, markerId);
-                    for (var i = prevEmittedCol; i < endColumn; i++) {
-                        sourceMapRecorder.Write("^");
-                    }
-                    if (endContinues) {
-                        sourceMapRecorder.Write("->");
-                    }
-                    sourceMapRecorder.WriteLine("");
-                    spanMarkerContinues = endContinues;
-                }
-                function writeSourceMapSourceText(currentSpan, index) {
-                    var sourcePos = tsLineMap[currentSpan.sourceMapSpan.sourceLine - 1] + (currentSpan.sourceMapSpan.sourceColumn - 1);
-                    var sourceText = "";
-                    if (prevWrittenSourcePos < sourcePos) {
-                        // Position that goes forward, get text
-                        sourceText = tsCode.substring(prevWrittenSourcePos, sourcePos);
-                    }
-                    if (currentSpan.decodeErrors) {
-                        // If there are decode errors, write
-                        for (var _i = 0, _a = currentSpan.decodeErrors; _i < _a.length; _i++) {
-                            var decodeError = _a[_i];
-                            writeSourceMapIndent(prevEmittedCol, markerIds[index]);
-                            sourceMapRecorder.WriteLine(decodeError);
-                        }
-                    }
-                    var tsCodeLineMap = ts.computeLineStarts(sourceText);
-                    for (var i = 0; i < tsCodeLineMap.length; i++) {
-                        writeSourceMapIndent(prevEmittedCol, i === 0 ? markerIds[index] : "  >");
-                        sourceMapRecorder.Write(getTextOfLine(i, tsCodeLineMap, sourceText));
-                        if (i === tsCodeLineMap.length - 1) {
-                            sourceMapRecorder.WriteLine("");
-                        }
-                    }
-                    prevWrittenSourcePos = sourcePos;
-                }
-                function writeSpanDetails(currentSpan, index) {
-                    sourceMapRecorder.WriteLine(markerIds[index] + getSourceMapSpanString(currentSpan.sourceMapSpan));
-                }
-                if (spansOnSingleLine.length) {
-                    var currentJsLine = spansOnSingleLine[0].sourceMapSpan.emittedLine;
-                    // Write js line
-                    writeJsFileLines(currentJsLine);
-                    // Emit markers
-                    iterateSpans(writeSourceMapMarker);
-                    var jsFileText = getTextOfLine(currentJsLine, jsLineMap, jsFile.text);
-                    if (prevEmittedCol < jsFileText.length) {
-                        // There is remaining text on this line that will be part of next source span so write marker that continues
-                        writeSourceMapMarker(/*currentSpan*/ undefined, spansOnSingleLine.length, /*endColumn*/ jsFileText.length, /*endContinues*/ true); // TODO: GH#18217
-                    }
-                    // Emit Source text
-                    iterateSpans(writeSourceMapSourceText);
-                    // Emit column number etc
-                    iterateSpans(writeSpanDetails);
-                    sourceMapRecorder.WriteLine("---");
-                }
-            }
-        })(SourceMapSpanWriter || (SourceMapSpanWriter = {}));
-        function getSourceMapRecord(sourceMapDataList, program, jsFiles, declarationFiles) {
-            var sourceMapRecorder = new Harness.Compiler.WriterAggregator();
-            for (var i = 0; i < sourceMapDataList.length; i++) {
-                var sourceMapData = sourceMapDataList[i];
-                var prevSourceFile = void 0;
-                var currentFile = void 0;
-                if (ts.endsWith(sourceMapData.sourceMapFile, ".d.ts" /* Dts */)) {
-                    if (sourceMapDataList.length > jsFiles.length) {
-                        currentFile = declarationFiles[Math.floor(i / 2)]; // When both kinds of source map are present, they alternate js/dts
-                    }
-                    else {
-                        currentFile = declarationFiles[i];
-                    }
-                }
-                else {
-                    if (sourceMapDataList.length > jsFiles.length) {
-                        currentFile = jsFiles[Math.floor(i / 2)];
-                    }
-                    else {
-                        currentFile = jsFiles[i];
-                    }
-                }
-                SourceMapSpanWriter.initializeSourceMapSpanWriter(sourceMapRecorder, sourceMapData, currentFile);
-                for (var _i = 0, _a = sourceMapData.sourceMapDecodedMappings; _i < _a.length; _i++) {
-                    var decodedSourceMapping = _a[_i];
-                    var currentSourceFile = program.getSourceFile(sourceMapData.inputSourceFileNames[decodedSourceMapping.sourceIndex]);
-                    if (currentSourceFile !== prevSourceFile) {
-                        SourceMapSpanWriter.recordNewSourceFileSpan(decodedSourceMapping, currentSourceFile.text);
-                        prevSourceFile = currentSourceFile;
-                    }
-                    else {
-                        SourceMapSpanWriter.recordSourceMapSpan(decodedSourceMapping);
-                    }
-                }
-                SourceMapSpanWriter.close(); // If the last spans werent emitted, emit them
-            }
-            sourceMapRecorder.Close();
-            return sourceMapRecorder.lines.join("\r\n");
-        }
-        SourceMapRecorder.getSourceMapRecord = getSourceMapRecord;
-    })(SourceMapRecorder = Harness.SourceMapRecorder || (Harness.SourceMapRecorder = {}));
-})(Harness || (Harness = {}));
-// Block scoped definitions work poorly for global variables, temporarily enable var
-/* tslint:disable:no-var-keyword */
-// this will work in the browser via browserify
-var _chai = require("chai");
-var assert = _chai.assert;
-{
-    // chai's builtin `assert.isFalse` is featureful but slow - we don't use those features,
-    // so we'll just overwrite it as an alterative to migrating a bunch of code off of chai
-    assert.isFalse = function (expr, msg) { if (expr !== false)
-        throw new Error(msg); };
-    var assertDeepImpl_1 = assert.deepEqual;
-    assert.deepEqual = function (a, b, msg) {
-        if (ts.isArray(a) && ts.isArray(b)) {
-            assertDeepImpl_1(arrayExtraKeysObject(a), arrayExtraKeysObject(b), "Array extra keys differ");
-        }
-        assertDeepImpl_1(a, b, msg);
-        function arrayExtraKeysObject(a) {
-            var obj = {};
-            for (var key in a) {
-                if (Number.isNaN(Number(key))) {
-                    obj[key] = a[key];
-                }
-            }
-            return obj;
-        }
-    };
-}
-var global = Function("return this").call(undefined);
-/* tslint:enable:no-var-keyword prefer-const */
-var Utils;
-(function (Utils) {
-    // Setup some globals based on the current environment
-    var ExecutionEnvironment;
-    (function (ExecutionEnvironment) {
-        ExecutionEnvironment[ExecutionEnvironment["Node"] = 0] = "Node";
-        ExecutionEnvironment[ExecutionEnvironment["Browser"] = 1] = "Browser";
-    })(ExecutionEnvironment = Utils.ExecutionEnvironment || (Utils.ExecutionEnvironment = {}));
-    function getExecutionEnvironment() {
-        if (typeof window !== "undefined") {
-            return 1 /* Browser */;
-        }
-        else {
-            return 0 /* Node */;
-        }
-    }
-    Utils.getExecutionEnvironment = getExecutionEnvironment;
-    Utils.currentExecutionEnvironment = getExecutionEnvironment();
-    // Thanks to browserify, Buffer is always available nowadays
-    var Buffer = require("buffer").Buffer;
-    function encodeString(s) {
-        return Buffer.from(s).toString("utf8");
-    }
-    Utils.encodeString = encodeString;
-    function byteLength(s, encoding) {
-        // stub implementation if Buffer is not available (in-browser case)
-        return Buffer.byteLength(s, encoding);
-    }
-    Utils.byteLength = byteLength;
-    function evalFile(fileContents, fileName, nodeContext) {
-        var environment = getExecutionEnvironment();
-        switch (environment) {
-            case 1 /* Browser */:
-                eval(fileContents);
-                break;
-            case 0 /* Node */:
-                var vm = require("vm");
-                if (nodeContext) {
-                    vm.runInNewContext(fileContents, nodeContext, fileName);
-                }
-                else {
-                    vm.runInThisContext(fileContents, fileName);
-                }
-                break;
-            default:
-                throw new Error("Unknown context");
-        }
-    }
-    Utils.evalFile = evalFile;
-    /** Splits the given string on \r\n, or on only \n if that fails, or on only \r if *that* fails. */
-    function splitContentByNewlines(content) {
-        // Split up the input file by line
-        // Note: IE JS engine incorrectly handles consecutive delimiters here when using RegExp split, so
-        // we have to use string-based splitting instead and try to figure out the delimiting chars
-        var lines = content.split("\r\n");
-        if (lines.length === 1) {
-            lines = content.split("\n");
-            if (lines.length === 1) {
-                lines = content.split("\r");
-            }
-        }
-        return lines;
-    }
-    Utils.splitContentByNewlines = splitContentByNewlines;
-    /** Reads a file under /tests */
-    function readTestFile(path) {
-        if (path.indexOf("tests") < 0) {
-            path = "tests/" + path;
-        }
-        var content;
-        try {
-            content = Harness.IO.readFile(Harness.userSpecifiedRoot + path);
-        }
-        catch (err) {
-            return undefined;
-        }
-        return content;
-    }
-    Utils.readTestFile = readTestFile;
-    function memoize(f, memoKey) {
-        var cache = ts.createMap();
-        return (function () {
-            var args = [];
-            for (var _i = 0; _i < arguments.length; _i++) {
-                args[_i] = arguments[_i];
-            }
-            var key = memoKey.apply(void 0, args);
-            if (cache.has(key)) {
-                return cache.get(key);
-            }
-            else {
-                var value = f.apply(this, args);
-                cache.set(key, value);
-                return value;
-            }
-        });
-    }
-    Utils.memoize = memoize;
-    Utils.canonicalizeForHarness = ts.createGetCanonicalFileName(/*caseSensitive*/ false); // This is done so tests work on windows _and_ linux
-    function assertInvariants(node, parent) {
-        if (node) {
-            assert.isFalse(node.pos < 0, "node.pos < 0");
-            assert.isFalse(node.end < 0, "node.end < 0");
-            assert.isFalse(node.end < node.pos, "node.end < node.pos");
-            assert.equal(node.parent, parent, "node.parent !== parent");
-            if (parent) {
-                // Make sure each child is contained within the parent.
-                assert.isFalse(node.pos < parent.pos, "node.pos < parent.pos");
-                assert.isFalse(node.end > parent.end, "node.end > parent.end");
-            }
-            ts.forEachChild(node, function (child) {
-                assertInvariants(child, node);
-            });
-            // Make sure each of the children is in order.
-            var currentPos_1 = 0;
-            ts.forEachChild(node, function (child) {
-                assert.isFalse(child.pos < currentPos_1, "child.pos < currentPos");
-                currentPos_1 = child.end;
-            }, function (array) {
-                assert.isFalse(array.pos < node.pos, "array.pos < node.pos");
-                assert.isFalse(array.end > node.end, "array.end > node.end");
-                assert.isFalse(array.pos < currentPos_1, "array.pos < currentPos");
-                for (var _i = 0, array_1 = array; _i < array_1.length; _i++) {
-                    var item = array_1[_i];
-                    assert.isFalse(item.pos < currentPos_1, "array[i].pos < currentPos");
-                    currentPos_1 = item.end;
-                }
-                currentPos_1 = array.end;
-            });
-            var childNodesAndArrays_1 = [];
-            ts.forEachChild(node, function (child) { childNodesAndArrays_1.push(child); }, function (array) { childNodesAndArrays_1.push(array); });
-            for (var childName in node) {
-                if (childName === "parent" || childName === "nextContainer" || childName === "modifiers" || childName === "externalModuleIndicator" ||
-                    // for now ignore jsdoc comments
-                    childName === "jsDocComment" || childName === "checkJsDirective" || childName === "commonJsModuleIndicator") {
-                    continue;
-                }
-                var child = node[childName];
-                if (isNodeOrArray(child)) {
-                    assert.isFalse(childNodesAndArrays_1.indexOf(child) < 0, "Missing child when forEach'ing over node: " + ts.SyntaxKind[node.kind] + "-" + childName);
-                }
-            }
-        }
-    }
-    Utils.assertInvariants = assertInvariants;
-    function isNodeOrArray(a) {
-        return a !== undefined && typeof a.pos === "number";
-    }
-    function convertDiagnostics(diagnostics) {
-        return diagnostics.map(convertDiagnostic);
-    }
-    Utils.convertDiagnostics = convertDiagnostics;
-    function convertDiagnostic(diagnostic) {
-        return {
-            start: diagnostic.start,
-            length: diagnostic.length,
-            messageText: ts.flattenDiagnosticMessageText(diagnostic.messageText, Harness.IO.newLine()),
-            category: ts.diagnosticCategoryName(diagnostic, /*lowerCase*/ false),
-            code: diagnostic.code
-        };
-    }
-    function sourceFileToJSON(file) {
-        return JSON.stringify(file, function (_, v) { return isNodeOrArray(v) ? serializeNode(v) : v; }, "    ");
-        function getKindName(k) {
-            if (ts.isString(k)) {
-                return k;
-            }
-            // For some markers in SyntaxKind, we should print its original syntax name instead of
-            // the marker name in tests.
-            if (k === ts.SyntaxKind.FirstJSDocNode ||
-                k === ts.SyntaxKind.LastJSDocNode ||
-                k === ts.SyntaxKind.FirstJSDocTagNode ||
-                k === ts.SyntaxKind.LastJSDocTagNode) {
-                for (var kindName in ts.SyntaxKind) {
-                    if (ts.SyntaxKind[kindName] === k) {
-                        return kindName;
-                    }
-                }
-            }
-            return ts.SyntaxKind[k];
-        }
-        function getFlagName(flags, f) {
-            if (f === 0) {
-                return 0;
-            }
-            var result = "";
-            ts.forEach(Object.getOwnPropertyNames(flags), function (v) {
-                if (isFinite(v)) {
-                    v = +v;
-                    if (f === +v) {
-                        result = flags[v];
-                        return true;
-                    }
-                    else if ((f & v) > 0) {
-                        if (result.length) {
-                            result += " | ";
-                        }
-                        result += flags[v];
-                        return false;
-                    }
-                }
-            });
-            return result;
-        }
-        function getNodeFlagName(f) { return getFlagName(ts.NodeFlags, f); }
-        function serializeNode(n) {
-            var o = { kind: getKindName(n.kind) };
-            if (ts.containsParseError(n)) {
-                o.containsParseError = true;
-            }
-            for (var _i = 0, _a = Object.getOwnPropertyNames(n); _i < _a.length; _i++) {
-                var propertyName = _a[_i];
-                switch (propertyName) {
-                    case "parent":
-                    case "symbol":
-                    case "locals":
-                    case "localSymbol":
-                    case "kind":
-                    case "id":
-                    case "nodeCount":
-                    case "symbolCount":
-                    case "identifierCount":
-                    case "scriptSnapshot":
-                        // Blacklist of items we never put in the baseline file.
-                        break;
-                    case "originalKeywordKind":
-                        o[propertyName] = getKindName(n[propertyName]);
-                        break;
-                    case "flags":
-                        // Clear the flags that are produced by aggregating child values. That is ephemeral
-                        // data we don't care about in the dump. We only care what the parser set directly
-                        // on the AST.
-                        var flags = n.flags & ~(65536 /* JavaScriptFile */ | 262144 /* HasAggregatedChildData */);
-                        if (flags) {
-                            o[propertyName] = getNodeFlagName(flags);
-                        }
-                        break;
-                    case "parseDiagnostics":
-                        o[propertyName] = convertDiagnostics(n[propertyName]);
-                        break;
-                    case "nextContainer":
-                        if (n.nextContainer) {
-                            o[propertyName] = { kind: n.nextContainer.kind, pos: n.nextContainer.pos, end: n.nextContainer.end };
-                        }
-                        break;
-                    case "text":
-                        // Include 'text' field for identifiers/literals, but not for source files.
-                        if (n.kind !== 274 /* SourceFile */) {
-                            o[propertyName] = n[propertyName];
-                        }
-                        break;
-                    default:
-                        o[propertyName] = n[propertyName];
-                }
-            }
-            return o;
-        }
-    }
-    Utils.sourceFileToJSON = sourceFileToJSON;
-    function assertDiagnosticsEquals(array1, array2) {
-        if (array1 === array2) {
-            return;
-        }
-        assert(array1, "array1");
-        assert(array2, "array2");
-        assert.equal(array1.length, array2.length, "array1.length !== array2.length");
-        for (var i = 0; i < array1.length; i++) {
-            var d1 = array1[i];
-            var d2 = array2[i];
-            assert.equal(d1.start, d2.start, "d1.start !== d2.start");
-            assert.equal(d1.length, d2.length, "d1.length !== d2.length");
-            assert.equal(ts.flattenDiagnosticMessageText(d1.messageText, Harness.IO.newLine()), ts.flattenDiagnosticMessageText(d2.messageText, Harness.IO.newLine()), "d1.messageText !== d2.messageText");
-            assert.equal(d1.category, d2.category, "d1.category !== d2.category");
-            assert.equal(d1.code, d2.code, "d1.code !== d2.code");
-        }
-    }
-    Utils.assertDiagnosticsEquals = assertDiagnosticsEquals;
-    function assertStructuralEquals(node1, node2) {
-        if (node1 === node2) {
-            return;
-        }
-        assert(node1, "node1");
-        assert(node2, "node2");
-        assert.equal(node1.pos, node2.pos, "node1.pos !== node2.pos");
-        assert.equal(node1.end, node2.end, "node1.end !== node2.end");
-        assert.equal(node1.kind, node2.kind, "node1.kind !== node2.kind");
-        // call this on both nodes to ensure all propagated flags have been set (and thus can be
-        // compared).
-        assert.equal(ts.containsParseError(node1), ts.containsParseError(node2));
-        assert.equal(node1.flags & ~1408 /* ReachabilityAndEmitFlags */, node2.flags & ~1408 /* ReachabilityAndEmitFlags */, "node1.flags !== node2.flags");
-        ts.forEachChild(node1, function (child1) {
-            var childName = findChildName(node1, child1);
-            var child2 = node2[childName];
-            assertStructuralEquals(child1, child2);
-        }, function (array1) {
-            var childName = findChildName(node1, array1);
-            var array2 = node2[childName];
-            assertArrayStructuralEquals(array1, array2);
-        });
-    }
-    Utils.assertStructuralEquals = assertStructuralEquals;
-    function assertArrayStructuralEquals(array1, array2) {
-        if (array1 === array2) {
-            return;
-        }
-        assert(array1, "array1");
-        assert(array2, "array2");
-        assert.equal(array1.pos, array2.pos, "array1.pos !== array2.pos");
-        assert.equal(array1.end, array2.end, "array1.end !== array2.end");
-        assert.equal(array1.length, array2.length, "array1.length !== array2.length");
-        for (var i = 0; i < array1.length; i++) {
-            assertStructuralEquals(array1[i], array2[i]);
-        }
-    }
-    function findChildName(parent, child) {
-        for (var name in parent) {
-            if (parent.hasOwnProperty(name) && parent[name] === child) {
-                return name;
-            }
-        }
-        throw new Error("Could not find child in parent");
-    }
-    var maxHarnessFrames = 1;
-    function filterStack(error, stackTraceLimit) {
-        if (stackTraceLimit === void 0) { stackTraceLimit = Infinity; }
-        var stack = error.stack;
-        if (stack) {
-            var lines = stack.split(/\r\n?|\n/g);
-            var filtered = [];
-            var frameCount = 0;
-            var harnessFrameCount = 0;
-            for (var _i = 0, lines_2 = lines; _i < lines_2.length; _i++) {
-                var line = lines_2[_i];
-                if (isStackFrame(line)) {
-                    if (frameCount >= stackTraceLimit
-                        || isMocha(line)
-                        || isNode(line)) {
-                        continue;
-                    }
-                    if (isHarness(line)) {
-                        if (harnessFrameCount >= maxHarnessFrames) {
-                            continue;
-                        }
-                        harnessFrameCount++;
-                    }
-                    line = line.replace(/\bfile:\/\/\/(.*?)(?=(:\d+)*($|\)))/, function (_, path) { return ts.sys.resolvePath(path); });
-                    frameCount++;
-                }
-                filtered.push(line);
-            }
-            error.stack = filtered.join(Harness.IO.newLine());
-        }
-        return error;
-    }
-    Utils.filterStack = filterStack;
-    function isStackFrame(line) {
-        return /^\s+at\s/.test(line);
-    }
-    function isMocha(line) {
-        return /[\\/](node_modules|components)[\\/]mocha(js)?[\\/]|[\\/]mocha\.js/.test(line);
-    }
-    function isNode(line) {
-        return /\((timers|events|node|module)\.js:/.test(line);
-    }
-    function isHarness(line) {
-        return /[\\/]src[\\/]harness[\\/]|[\\/]run\.js/.test(line);
-    }
-})(Utils || (Utils = {}));
-var Harness;
-(function (Harness) {
-    // harness always uses one kind of new line
-    // But note that `parseTestData` in `fourslash.ts` uses "\n"
-    Harness.harnessNewLine = "\r\n";
-    // Root for file paths that are stored in a virtual file system
-    Harness.virtualFileSystemRoot = "/";
-    function createNodeIO() {
-        var fs, pathModule;
-        if (require) {
-            fs = require("fs");
-            pathModule = require("path");
-        }
-        else {
-            fs = pathModule = {};
-        }
-        function deleteFile(path) {
-            try {
-                fs.unlinkSync(path);
-            }
-            catch ( /*ignore*/_a) { /*ignore*/ }
-        }
-        function directoryName(path) {
-            var dirPath = pathModule.dirname(path);
-            // Node will just continue to repeat the root path, rather than return null
-            return dirPath === path ? undefined : dirPath;
-        }
-        function enumerateTestFiles(runner) {
-            return runner.enumerateTestFiles();
-        }
-        function listFiles(path, spec, options) {
-            if (options === void 0) { options = {}; }
-            function filesInFolder(folder) {
-                var paths = [];
-                for (var _i = 0, _a = fs.readdirSync(folder); _i < _a.length; _i++) {
-                    var file = _a[_i];
-                    var pathToFile = pathModule.join(folder, file);
-                    var stat = fs.statSync(pathToFile);
-                    if (options.recursive && stat.isDirectory()) {
-                        paths = paths.concat(filesInFolder(pathToFile));
-                    }
-                    else if (stat.isFile() && (!spec || file.match(spec))) {
-                        paths.push(pathToFile);
-                    }
-                }
-                return paths;
-            }
-            return filesInFolder(path);
-        }
-        function getAccessibleFileSystemEntries(dirname) {
-            try {
-                var entries = fs.readdirSync(dirname || ".").sort(ts.sys.useCaseSensitiveFileNames ? ts.compareStringsCaseSensitive : ts.compareStringsCaseInsensitive);
-                var files = [];
-                var directories = [];
-                for (var _i = 0, entries_1 = entries; _i < entries_1.length; _i++) {
-                    var entry = entries_1[_i];
-                    if (entry === "." || entry === "..")
-                        continue;
-                    var name = vpath.combine(dirname, entry);
-                    try {
-                        var stat = fs.statSync(name);
-                        if (!stat)
-                            continue;
-                        if (stat.isFile()) {
-                            files.push(entry);
-                        }
-                        else if (stat.isDirectory()) {
-                            directories.push(entry);
-                        }
-                    }
-                    catch ( /*ignore*/_a) { /*ignore*/ }
-                }
-                return { files: files, directories: directories };
-            }
-            catch (e) {
-                return { files: [], directories: [] };
-            }
-        }
-        function createDirectory(path) {
-            try {
-                fs.mkdirSync(path);
-            }
-            catch (e) {
-                if (e.code === "ENOENT") {
-                    createDirectory(vpath.dirname(path));
-                    createDirectory(path);
-                }
-                else if (!ts.sys.directoryExists(path)) {
-                    throw e;
-                }
-            }
-        }
-        return {
-            newLine: function () { return Harness.harnessNewLine; },
-            getCurrentDirectory: function () { return ts.sys.getCurrentDirectory(); },
-            useCaseSensitiveFileNames: function () { return ts.sys.useCaseSensitiveFileNames; },
-            resolvePath: function (path) { return ts.sys.resolvePath(path); },
-            getFileSize: function (path) { return ts.sys.getFileSize(path); },
-            readFile: function (path) { return ts.sys.readFile(path); },
-            writeFile: function (path, content) { return ts.sys.writeFile(path, content); },
-            directoryName: directoryName,
-            getDirectories: function (path) { return ts.sys.getDirectories(path); },
-            createDirectory: createDirectory,
-            fileExists: function (path) { return ts.sys.fileExists(path); },
-            directoryExists: function (path) { return ts.sys.directoryExists(path); },
-            deleteFile: deleteFile,
-            listFiles: listFiles,
-            enumerateTestFiles: enumerateTestFiles,
-            log: function (s) { return console.log(s); },
-            args: function () { return ts.sys.args; },
-            getExecutingFilePath: function () { return ts.sys.getExecutingFilePath(); },
-            getWorkspaceRoot: function () { return vpath.resolve(__dirname, "../.."); },
-            exit: function (exitCode) { return ts.sys.exit(exitCode); },
-            readDirectory: function (path, extension, exclude, include, depth) { return ts.sys.readDirectory(path, extension, exclude, include, depth); },
-            getAccessibleFileSystemEntries: getAccessibleFileSystemEntries,
-            tryEnableSourceMapsForHost: function () { return ts.sys.tryEnableSourceMapsForHost && ts.sys.tryEnableSourceMapsForHost(); },
-            getMemoryUsage: function () { return ts.sys.getMemoryUsage && ts.sys.getMemoryUsage(); },
-            getEnvironmentVariable: function (name) { return ts.sys.getEnvironmentVariable(name); },
-        };
-    }
-    function createBrowserIO() {
-        var serverRoot = new URL("http://localhost:8888/");
-        var HttpHeaders = /** @class */ (function (_super) {
-            __extends(HttpHeaders, _super);
-            function HttpHeaders(template) {
-                var _this = _super.call(this, ts.compareStringsCaseInsensitive) || this;
-                if (template) {
-                    for (var key in template) {
-                        if (ts.hasProperty(template, key)) {
-                            _this.set(key, template[key]);
-                        }
-                    }
-                }
-                return _this;
-            }
-            HttpHeaders.combine = function (left, right) {
-                if (!left && !right)
-                    return undefined;
-                var headers = new HttpHeaders();
-                if (left)
-                    left.forEach(function (value, key) { headers.set(key, value); });
-                if (right)
-                    right.forEach(function (value, key) { headers.set(key, value); });
-                return headers;
-            };
-            HttpHeaders.prototype.has = function (key) {
-                return _super.prototype.has.call(this, key.toLowerCase());
-            };
-            HttpHeaders.prototype.get = function (key) {
-                return _super.prototype.get.call(this, key.toLowerCase());
-            };
-            HttpHeaders.prototype.set = function (key, value) {
-                return _super.prototype.set.call(this, key.toLowerCase(), value);
-            };
-            HttpHeaders.prototype.delete = function (key) {
-                return _super.prototype.delete.call(this, key.toLowerCase());
-            };
-            HttpHeaders.prototype.writeRequestHeaders = function (xhr) {
-                this.forEach(function (values, key) {
-                    if (key === "access-control-allow-origin" || key === "content-length")
-                        return;
-                    var value = Array.isArray(values) ? values.join(",") : values;
-                    if (key === "content-type") {
-                        xhr.overrideMimeType(value);
-                        return;
-                    }
-                    xhr.setRequestHeader(key, value);
-                });
-            };
-            HttpHeaders.readResponseHeaders = function (xhr) {
-                var allHeaders = xhr.getAllResponseHeaders();
-                var headers = new HttpHeaders();
-                for (var _i = 0, _a = allHeaders.split(/\r\n/g); _i < _a.length; _i++) {
-                    var header = _a[_i];
-                    var colonIndex = header.indexOf(":");
-                    if (colonIndex >= 0) {
-                        var key = header.slice(0, colonIndex).trim();
-                        var value = header.slice(colonIndex + 1).trim();
-                        var values = value.split(",");
-                        headers.set(key, values.length > 1 ? values : value);
-                    }
-                }
-                return headers;
-            };
-            return HttpHeaders;
-        }(collections.SortedMap));
-        var HttpContent = /** @class */ (function () {
-            function HttpContent(headers, content) {
-                this.headers = headers instanceof HttpHeaders ? headers : new HttpHeaders(headers);
-                this.content = content;
-            }
-            HttpContent.fromMediaType = function (mediaType, content) {
-                return new HttpContent({ "Content-Type": mediaType }, content);
-            };
-            HttpContent.text = function (content) {
-                return HttpContent.fromMediaType("text/plain", content);
-            };
-            HttpContent.json = function (content) {
-                return HttpContent.fromMediaType("application/json", JSON.stringify(content));
-            };
-            HttpContent.readResponseContent = function (xhr) {
-                if (typeof xhr.responseText === "string") {
-                    return new HttpContent({
-                        "Content-Type": xhr.getResponseHeader("Content-Type") || undefined,
-                        "Content-Length": xhr.getResponseHeader("Content-Length") || undefined,
-                    }, xhr.responseText);
-                }
-                return undefined;
-            };
-            HttpContent.prototype.writeRequestHeaders = function (xhr) {
-                this.headers.writeRequestHeaders(xhr);
-            };
-            return HttpContent;
-        }());
-        var HttpRequestMessage = /** @class */ (function () {
-            function HttpRequestMessage(method, url, headers, content) {
-                this.method = method;
-                this.url = typeof url === "string" ? new URL(url) : url;
-                this.headers = headers instanceof HttpHeaders ? headers : new HttpHeaders(headers);
-                this.content = content;
-            }
-            HttpRequestMessage.options = function (url) {
-                return new HttpRequestMessage("OPTIONS", url);
-            };
-            HttpRequestMessage.head = function (url) {
-                return new HttpRequestMessage("HEAD", url);
-            };
-            HttpRequestMessage.get = function (url) {
-                return new HttpRequestMessage("GET", url);
-            };
-            HttpRequestMessage.delete = function (url) {
-                return new HttpRequestMessage("DELETE", url);
-            };
-            HttpRequestMessage.put = function (url, content) {
-                return new HttpRequestMessage("PUT", url, /*headers*/ undefined, content);
-            };
-            HttpRequestMessage.post = function (url, content) {
-                return new HttpRequestMessage("POST", url, /*headers*/ undefined, content);
-            };
-            HttpRequestMessage.prototype.writeRequestHeaders = function (xhr) {
-                this.headers.writeRequestHeaders(xhr);
-                if (this.content) {
-                    this.content.writeRequestHeaders(xhr);
-                }
-            };
-            return HttpRequestMessage;
-        }());
-        var HttpResponseMessage = /** @class */ (function () {
-            function HttpResponseMessage(statusCode, statusMessage, headers, content) {
-                this.statusCode = statusCode;
-                this.statusMessage = statusMessage;
-                this.headers = headers instanceof HttpHeaders ? headers : new HttpHeaders(headers);
-                this.content = content;
-            }
-            HttpResponseMessage.notFound = function () {
-                return new HttpResponseMessage(404, "Not Found");
-            };
-            HttpResponseMessage.hasSuccessStatusCode = function (response) {
-                return response.statusCode === 304 || (response.statusCode >= 200 && response.statusCode < 300);
-            };
-            HttpResponseMessage.readResponseMessage = function (xhr) {
-                return new HttpResponseMessage(xhr.status, xhr.statusText, HttpHeaders.readResponseHeaders(xhr), HttpContent.readResponseContent(xhr));
-            };
-            return HttpResponseMessage;
-        }());
-        function send(request) {
-            var xhr = new XMLHttpRequest();
-            try {
-                xhr.open(request.method, request.url.toString(), /*async*/ false);
-                request.writeRequestHeaders(xhr);
-                xhr.setRequestHeader("Access-Control-Allow-Origin", "*");
-                xhr.send(request.content && request.content.content);
-                while (xhr.readyState !== 4)
-                    ; // block until ready
-                return HttpResponseMessage.readResponseMessage(xhr);
-            }
-            catch (e) {
-                return HttpResponseMessage.notFound();
-            }
-        }
-        var caseSensitivity;
-        function useCaseSensitiveFileNames() {
-            if (!caseSensitivity) {
-                var response = send(HttpRequestMessage.options(new URL("*", serverRoot)));
-                var xCaseSensitivity = response.headers.get("X-Case-Sensitivity");
-                caseSensitivity = xCaseSensitivity === "CS" ? "CS" : "CI";
-            }
-            return caseSensitivity === "CS";
-        }
-        function resolvePath(path) {
-            var response = send(HttpRequestMessage.post(new URL("/api/resolve", serverRoot), HttpContent.text(path)));
-            return HttpResponseMessage.hasSuccessStatusCode(response) && response.content ? response.content.content : undefined;
-        }
-        function getFileSize(path) {
-            var response = send(HttpRequestMessage.head(new URL(path, serverRoot)));
-            return HttpResponseMessage.hasSuccessStatusCode(response) ? +response.headers.get("Content-Length").toString() : 0;
-        }
-        function readFile(path) {
-            var response = send(HttpRequestMessage.get(new URL(path, serverRoot)));
-            return HttpResponseMessage.hasSuccessStatusCode(response) && response.content ? response.content.content : undefined;
-        }
-        function writeFile(path, contents) {
-            send(HttpRequestMessage.put(new URL(path, serverRoot), HttpContent.text(contents)));
-        }
-        function fileExists(path) {
-            var response = send(HttpRequestMessage.head(new URL(path, serverRoot)));
-            return HttpResponseMessage.hasSuccessStatusCode(response);
-        }
-        function directoryExists(path) {
-            var response = send(HttpRequestMessage.post(new URL("/api/directoryExists", serverRoot), HttpContent.text(path)));
-            return hasJsonContent(response) && JSON.parse(response.content.content);
-        }
-        function deleteFile(path) {
-            send(HttpRequestMessage.delete(new URL(path, serverRoot)));
-        }
-        function directoryName(path) {
-            var url = new URL(path, serverRoot);
-            return ts.getDirectoryPath(ts.normalizeSlashes(url.pathname || "/"));
-        }
-        function enumerateTestFiles(runner) {
-            var response = send(HttpRequestMessage.post(new URL("/api/enumerateTestFiles", serverRoot), HttpContent.text(runner.kind())));
-            return hasJsonContent(response) ? JSON.parse(response.content.content) : [];
-        }
-        function listFiles(dirname, spec, options) {
-            if (spec || (options && !options.recursive)) {
-                var results = Harness.IO.listFiles(dirname);
-                if (spec) {
-                    results = results.filter(function (file) { return spec.test(file); });
-                }
-                if (options && !options.recursive) {
-                    results = results.filter(function (file) { return ts.getDirectoryPath(ts.normalizeSlashes(file)) === dirname; });
-                }
-                return results;
-            }
-            var response = send(HttpRequestMessage.post(new URL("/api/listFiles", serverRoot), HttpContent.text(dirname)));
-            return hasJsonContent(response) ? JSON.parse(response.content.content) : [];
-        }
-        function readDirectory(path, extension, exclude, include, depth) {
-            return ts.matchFiles(path, extension, exclude, include, useCaseSensitiveFileNames(), "", depth, getAccessibleFileSystemEntries);
-        }
-        function getAccessibleFileSystemEntries(dirname) {
-            var response = send(HttpRequestMessage.post(new URL("/api/getAccessibleFileSystemEntries", serverRoot), HttpContent.text(dirname)));
-            return hasJsonContent(response) ? JSON.parse(response.content.content) : { files: [], directories: [] };
-        }
-        function hasJsonContent(response) {
-            return HttpResponseMessage.hasSuccessStatusCode(response)
-                && !!response.content
-                && /^application\/json(;.*)$/.test("" + response.content.headers.get("Content-Type"));
-        }
-        return {
-            newLine: function () { return Harness.harnessNewLine; },
-            getCurrentDirectory: function () { return ""; },
-            useCaseSensitiveFileNames: useCaseSensitiveFileNames,
-            resolvePath: resolvePath,
-            getFileSize: getFileSize,
-            readFile: readFile,
-            writeFile: writeFile,
-            directoryName: Utils.memoize(directoryName, function (path) { return path; }),
-            getDirectories: function () { return []; },
-            createDirectory: function () { },
-            fileExists: fileExists,
-            directoryExists: directoryExists,
-            deleteFile: deleteFile,
-            listFiles: Utils.memoize(listFiles, function (path, spec, options) { return path + "|" + spec + "|" + (options ? options.recursive === true : true); }),
-            enumerateTestFiles: Utils.memoize(enumerateTestFiles, function (runner) { return runner.kind(); }),
-            log: function (s) { return console.log(s); },
-            args: function () { return []; },
-            getExecutingFilePath: function () { return ""; },
-            exit: function () { },
-            readDirectory: readDirectory,
-            getAccessibleFileSystemEntries: getAccessibleFileSystemEntries,
-            getWorkspaceRoot: function () { return "/"; }
-        };
-    }
-    function mockHash(s) {
-        return "hash-" + s;
-    }
-    Harness.mockHash = mockHash;
-    var environment = Utils.getExecutionEnvironment();
-    switch (environment) {
-        case 0 /* Node */:
-            Harness.IO = createNodeIO();
-            break;
-        case 1 /* Browser */:
-            Harness.IO = createBrowserIO();
-            break;
-        default:
-            throw new Error("Unknown value '" + environment + "' for ExecutionEnvironment.");
-    }
-})(Harness || (Harness = {}));
-if (Harness.IO.tryEnableSourceMapsForHost && /^development$/i.test(Harness.IO.getEnvironmentVariable("NODE_ENV"))) {
-    Harness.IO.tryEnableSourceMapsForHost();
-}
-(function (Harness) {
-    Harness.libFolder = "built/local/";
-    var tcServicesFileName = ts.combinePaths(Harness.libFolder, Utils.getExecutionEnvironment() === 1 /* Browser */ ? "typescriptServicesInBrowserTest.js" : "typescriptServices.js");
-    Harness.tcServicesFile = Harness.IO.readFile(tcServicesFileName) + (Utils.getExecutionEnvironment() !== 1 /* Browser */
-        ? Harness.IO.newLine() + ("//# sourceURL=" + Harness.IO.resolvePath(tcServicesFileName))
-        : "");
-    // Settings
-    Harness.userSpecifiedRoot = "";
-    Harness.lightMode = false;
-    /** Functionality for compiling TypeScript code */
-    var Compiler;
-    (function (Compiler) {
-        /** Aggregate various writes into a single array of lines. Useful for passing to the
-         *  TypeScript compiler to fill with source code or errors.
-         */
-        var WriterAggregator = /** @class */ (function () {
-            function WriterAggregator() {
-                this.lines = [];
-                this.currentLine = undefined;
-            }
-            WriterAggregator.prototype.Write = function (str) {
-                // out of memory usage concerns avoid using + or += if we're going to do any manipulation of this string later
-                this.currentLine = [(this.currentLine || ""), str].join("");
-            };
-            WriterAggregator.prototype.WriteLine = function (str) {
-                // out of memory usage concerns avoid using + or += if we're going to do any manipulation of this string later
-                this.lines.push([(this.currentLine || ""), str].join(""));
-                this.currentLine = undefined;
-            };
-            WriterAggregator.prototype.Close = function () {
-                if (this.currentLine !== undefined) {
-                    this.lines.push(this.currentLine);
-                }
-                this.currentLine = undefined;
-            };
-            WriterAggregator.prototype.reset = function () {
-                this.lines = [];
-                this.currentLine = undefined;
-            };
-            return WriterAggregator;
-        }());
-        Compiler.WriterAggregator = WriterAggregator;
-        function createSourceFileAndAssertInvariants(fileName, sourceText, languageVersion) {
-            // We'll only assert invariants outside of light mode.
-            var shouldAssertInvariants = !Harness.lightMode;
-            // Only set the parent nodes if we're asserting invariants.  We don't need them otherwise.
-            var result = ts.createSourceFile(fileName, sourceText, languageVersion, /*setParentNodes:*/ shouldAssertInvariants);
-            if (shouldAssertInvariants) {
-                Utils.assertInvariants(result, /*parent:*/ undefined);
-            }
-            return result;
-        }
-        Compiler.createSourceFileAndAssertInvariants = createSourceFileAndAssertInvariants;
-        Compiler.defaultLibFileName = "lib.d.ts";
-        Compiler.es2015DefaultLibFileName = "lib.es2015.d.ts";
-        // Cache of lib files from "built/local"
-        var libFileNameSourceFileMap;
-        function getDefaultLibrarySourceFile(fileName) {
-            if (fileName === void 0) { fileName = Compiler.defaultLibFileName; }
-            var _a;
-            if (!isDefaultLibraryFile(fileName)) {
-                return undefined;
-            }
-            if (!libFileNameSourceFileMap) {
-                libFileNameSourceFileMap = ts.createMapFromTemplate((_a = {},
-                    _a[Compiler.defaultLibFileName] = createSourceFileAndAssertInvariants(Compiler.defaultLibFileName, Harness.IO.readFile(Harness.libFolder + "lib.es5.d.ts"), /*languageVersion*/ 6 /* Latest */),
-                    _a));
-            }
-            var sourceFile = libFileNameSourceFileMap.get(fileName);
-            if (!sourceFile) {
-                libFileNameSourceFileMap.set(fileName, sourceFile = createSourceFileAndAssertInvariants(fileName, Harness.IO.readFile(Harness.libFolder + fileName), 6 /* Latest */));
-            }
-            return sourceFile;
-        }
-        Compiler.getDefaultLibrarySourceFile = getDefaultLibrarySourceFile;
-        function getDefaultLibFileName(options) {
-            switch (options.target) {
-                case 6 /* ESNext */:
-                case 4 /* ES2017 */:
-                    return "lib.es2017.d.ts";
-                case 3 /* ES2016 */:
-                    return "lib.es2016.d.ts";
-                case 2 /* ES2015 */:
-                    return Compiler.es2015DefaultLibFileName;
-                default:
-                    return Compiler.defaultLibFileName;
-            }
-        }
-        Compiler.getDefaultLibFileName = getDefaultLibFileName;
-        // Cache these between executions so we don't have to re-parse them for every test
-        Compiler.fourslashFileName = "fourslash.ts";
-        function getCanonicalFileName(fileName) {
-            return fileName;
-        }
-        Compiler.getCanonicalFileName = getCanonicalFileName;
-        // Additional options not already in ts.optionDeclarations
-        var harnessOptionDeclarations = [
-            { name: "allowNonTsExtensions", type: "boolean" },
-            { name: "useCaseSensitiveFileNames", type: "boolean" },
-            { name: "baselineFile", type: "string" },
-            { name: "includeBuiltFile", type: "string" },
-            { name: "fileName", type: "string" },
-            { name: "libFiles", type: "string" },
-            { name: "noErrorTruncation", type: "boolean" },
-            { name: "suppressOutputPathCheck", type: "boolean" },
-            { name: "noImplicitReferences", type: "boolean" },
-            { name: "currentDirectory", type: "string" },
-            { name: "symlink", type: "string" },
-            // Emitted js baseline will print full paths for every output file
-            { name: "fullEmitPaths", type: "boolean" }
-        ];
-        var optionsIndex;
-        function getCommandLineOption(name) {
-            if (!optionsIndex) {
-                optionsIndex = ts.createMap();
-                var optionDeclarations = harnessOptionDeclarations.concat(ts.optionDeclarations);
-                for (var _i = 0, optionDeclarations_1 = optionDeclarations; _i < optionDeclarations_1.length; _i++) {
-                    var option = optionDeclarations_1[_i];
-                    optionsIndex.set(option.name.toLowerCase(), option);
-                }
-            }
-            return optionsIndex.get(name.toLowerCase());
-        }
-        function setCompilerOptionsFromHarnessSetting(settings, options) {
-            for (var name in settings) {
-                if (settings.hasOwnProperty(name)) {
-                    var value = settings[name];
-                    if (value === undefined) {
-                        throw new Error("Cannot have undefined value for compiler option '" + name + "'.");
-                    }
-                    var option = getCommandLineOption(name);
-                    if (option) {
-                        var errors = [];
-                        options[option.name] = optionValue(option, value, errors);
-                        if (errors.length > 0) {
-                            throw new Error("Unknown value '" + value + "' for compiler option '" + name + "'.");
-                        }
-                    }
-                    else {
-                        throw new Error("Unknown compiler option '" + name + "'.");
-                    }
-                }
-            }
-        }
-        Compiler.setCompilerOptionsFromHarnessSetting = setCompilerOptionsFromHarnessSetting;
-        function optionValue(option, value, errors) {
-            switch (option.type) {
-                case "boolean":
-                    return value.toLowerCase() === "true";
-                case "string":
-                    return value;
-                case "number": {
-                    var numverValue = parseInt(value, 10);
-                    if (isNaN(numverValue)) {
-                        throw new Error("Value must be a number, got: " + JSON.stringify(value));
-                    }
-                    return numverValue;
-                }
-                // If not a primitive, the possible types are specified in what is effectively a map of options.
-                case "list":
-                    return ts.parseListTypeOption(option, value, errors);
-                default:
-                    return ts.parseCustomTypeOption(option, value, errors);
-            }
-        }
-        function compileFiles(inputFiles, otherFiles, harnessSettings, compilerOptions, 
-        // Current directory is needed for rwcRunner to be able to use currentDirectory defined in json file
-        currentDirectory) {
-            var options = compilerOptions ? ts.cloneCompilerOptions(compilerOptions) : { noResolve: false };
-            options.target = options.target || 0 /* ES3 */;
-            options.newLine = options.newLine || 0 /* CarriageReturnLineFeed */;
-            options.noErrorTruncation = true;
-            options.skipDefaultLibCheck = typeof options.skipDefaultLibCheck === "undefined" ? true : options.skipDefaultLibCheck;
-            if (typeof currentDirectory === "undefined") {
-                currentDirectory = vfs.srcFolder;
-            }
-            // Parse settings
-            if (harnessSettings) {
-                setCompilerOptionsFromHarnessSetting(harnessSettings, options);
-            }
-            if (options.rootDirs) {
-                options.rootDirs = ts.map(options.rootDirs, function (d) { return ts.getNormalizedAbsolutePath(d, currentDirectory); });
-            }
-            var useCaseSensitiveFileNames = options.useCaseSensitiveFileNames !== undefined ? options.useCaseSensitiveFileNames : true;
-            var programFileNames = inputFiles.map(function (file) { return file.unitName; }).filter(function (fileName) { return !ts.fileExtensionIs(fileName, ".json" /* Json */); });
-            // Files from built\local that are requested by test "@includeBuiltFiles" to be in the context.
-            // Treat them as library files, so include them in build, but not in baselines.
-            if (options.includeBuiltFile) {
-                programFileNames.push(vpath.combine(vfs.builtFolder, options.includeBuiltFile));
-            }
-            // Files from tests\lib that are requested by "@libFiles"
-            if (options.libFiles) {
-                for (var _i = 0, _a = options.libFiles.split(","); _i < _a.length; _i++) {
-                    var fileName = _a[_i];
-                    programFileNames.push(vpath.combine(vfs.testLibFolder, fileName));
-                }
-            }
-            var docs = inputFiles.concat(otherFiles).map(documents.TextDocument.fromTestFile);
-            var fs = vfs.createFromFileSystem(Harness.IO, !useCaseSensitiveFileNames, { documents: docs, cwd: currentDirectory });
-            var host = new fakes.CompilerHost(fs, options);
-            return compiler.compileFiles(host, programFileNames, options);
-        }
-        Compiler.compileFiles = compileFiles;
-        function prepareDeclarationCompilationContext(inputFiles, otherFiles, result, harnessSettings, options, 
-        // Current directory is needed for rwcRunner to be able to use currentDirectory defined in json file
-        currentDirectory) {
-            if (options.declaration && result.diagnostics.length === 0) {
-                if (options.emitDeclarationOnly) {
-                    if (result.js.size > 0 || result.dts.size === 0) {
-                        throw new Error("Only declaration files should be generated when emitDeclarationOnly:true");
-                    }
-                }
-                else if (result.dts.size !== result.getNumberOfJsFiles()) {
-                    throw new Error("There were no errors and declFiles generated did not match number of js files generated");
-                }
-            }
-            var declInputFiles = [];
-            var declOtherFiles = [];
-            // if the .d.ts is non-empty, confirm it compiles correctly as well
-            if (options.declaration && result.diagnostics.length === 0 && result.dts.size > 0) {
-                ts.forEach(inputFiles, function (file) { return addDtsFile(file, declInputFiles); });
-                ts.forEach(otherFiles, function (file) { return addDtsFile(file, declOtherFiles); });
-                return { declInputFiles: declInputFiles, declOtherFiles: declOtherFiles, harnessSettings: harnessSettings, options: options, currentDirectory: currentDirectory || harnessSettings.currentDirectory };
-            }
-            function addDtsFile(file, dtsFiles) {
-                if (vpath.isDeclaration(file.unitName)) {
-                    dtsFiles.push(file);
-                }
-                else if (vpath.isTypeScript(file.unitName)) {
-                    var declFile = findResultCodeFile(file.unitName);
-                    if (declFile && !findUnit(declFile.file, declInputFiles) && !findUnit(declFile.file, declOtherFiles)) {
-                        dtsFiles.push({ unitName: declFile.file, content: utils.removeByteOrderMark(declFile.text) });
-                    }
-                }
-            }
-            function findResultCodeFile(fileName) {
-                var sourceFile = result.program.getSourceFile(fileName);
-                assert(sourceFile, "Program has no source file with name '" + fileName + "'");
-                // Is this file going to be emitted separately
-                var sourceFileName;
-                var outFile = options.outFile || options.out;
-                if (!outFile) {
-                    if (options.outDir) {
-                        var sourceFilePath = ts.getNormalizedAbsolutePath(sourceFile.fileName, result.vfs.cwd());
-                        sourceFilePath = sourceFilePath.replace(result.program.getCommonSourceDirectory(), "");
-                        sourceFileName = ts.combinePaths(options.outDir, sourceFilePath);
-                    }
-                    else {
-                        sourceFileName = sourceFile.fileName;
-                    }
-                }
-                else {
-                    // Goes to single --out file
-                    sourceFileName = outFile;
-                }
-                var dTsFileName = ts.removeFileExtension(sourceFileName) + ".d.ts" /* Dts */;
-                return result.dts.get(dTsFileName);
-            }
-            function findUnit(fileName, units) {
-                return ts.forEach(units, function (unit) { return unit.unitName === fileName ? unit : undefined; });
-            }
-        }
-        Compiler.prepareDeclarationCompilationContext = prepareDeclarationCompilationContext;
-        function compileDeclarationFiles(context) {
-            if (!context) {
-                return;
-            }
-            var declInputFiles = context.declInputFiles, declOtherFiles = context.declOtherFiles, harnessSettings = context.harnessSettings, options = context.options, currentDirectory = context.currentDirectory;
-            var output = compileFiles(declInputFiles, declOtherFiles, harnessSettings, options, currentDirectory);
-            return { declInputFiles: declInputFiles, declOtherFiles: declOtherFiles, declResult: output };
-        }
-        Compiler.compileDeclarationFiles = compileDeclarationFiles;
-        function minimalDiagnosticsToString(diagnostics, pretty) {
-            var host = { getCanonicalFileName: getCanonicalFileName, getCurrentDirectory: function () { return ""; }, getNewLine: function () { return Harness.IO.newLine(); } };
-            return (pretty ? ts.formatDiagnosticsWithColorAndContext : ts.formatDiagnostics)(diagnostics, host);
-        }
-        Compiler.minimalDiagnosticsToString = minimalDiagnosticsToString;
-        function getErrorBaseline(inputFiles, diagnostics, pretty) {
-            var _a;
-            var outputLines = "";
-            var gen = iterateErrorBaseline(inputFiles, diagnostics, { pretty: pretty });
-            for (var _b = gen.next(), done = _b.done, value = _b.value; !done; _a = gen.next(), done = _a.done, value = _a.value, _a) {
-                var content = value[1];
-                outputLines += content;
-            }
-            return outputLines;
-        }
-        Compiler.getErrorBaseline = getErrorBaseline;
-        Compiler.diagnosticSummaryMarker = "__diagnosticSummary";
-        Compiler.globalErrorsMarker = "__globalErrors";
-        function iterateErrorBaseline(inputFiles, diagnostics, options) {
-            function newLine() {
-                if (firstLine) {
-                    firstLine = false;
-                    return "";
-                }
-                return "\r\n";
-            }
-            function outputErrorText(error) {
-                var message = ts.flattenDiagnosticMessageText(error.messageText, Harness.IO.newLine());
-                var errLines = utils.removeTestPathPrefixes(message)
-                    .split("\n")
-                    .map(function (s) { return s.length > 0 && s.charAt(s.length - 1) === "\r" ? s.substr(0, s.length - 1) : s; })
-                    .filter(function (s) { return s.length > 0; })
-                    .map(function (s) { return "!!! " + ts.diagnosticCategoryName(error) + " TS" + error.code + ": " + s; });
-                errLines.forEach(function (e) { return outputLines += (newLine() + e); });
-                errorsReported++;
-                // do not count errors from lib.d.ts here, they are computed separately as numLibraryDiagnostics
-                // if lib.d.ts is explicitly included in input files and there are some errors in it (i.e. because of duplicate identifiers)
-                // then they will be added twice thus triggering 'total errors' assertion with condition
-                // 'totalErrorsReportedInNonLibraryFiles + numLibraryDiagnostics + numTest262HarnessDiagnostics, diagnostics.length
-                if (!error.file || !isDefaultLibraryFile(error.file.fileName)) {
-                    totalErrorsReportedInNonLibraryFiles++;
-                }
-            }
-            var outputLines, totalErrorsReportedInNonLibraryFiles, errorsReported, firstLine, globalErrors, dupeCase, _loop_1, _i, _a, inputFile, numLibraryDiagnostics, numTest262HarnessDiagnostics;
-            return __generator(this, function (_b) {
-                switch (_b.label) {
-                    case 0:
-                        diagnostics = ts.sort(diagnostics, ts.compareDiagnostics);
-                        outputLines = "";
-                        totalErrorsReportedInNonLibraryFiles = 0;
-                        errorsReported = 0;
-                        firstLine = true;
-                        return [4 /*yield*/, [Compiler.diagnosticSummaryMarker, utils.removeTestPathPrefixes(minimalDiagnosticsToString(diagnostics, options && options.pretty)) + Harness.IO.newLine() + Harness.IO.newLine(), diagnostics.length]];
-                    case 1:
-                        _b.sent();
-                        globalErrors = diagnostics.filter(function (err) { return !err.file; });
-                        globalErrors.forEach(outputErrorText);
-                        return [4 /*yield*/, [Compiler.globalErrorsMarker, outputLines, errorsReported]];
-                    case 2:
-                        _b.sent();
-                        outputLines = "";
-                        errorsReported = 0;
-                        dupeCase = ts.createMap();
-                        _loop_1 = function (inputFile) {
-                            var fileErrors, markedErrorCount, lineStarts, lines, isDupe;
-                            return __generator(this, function (_a) {
-                                switch (_a.label) {
-                                    case 0:
-                                        fileErrors = diagnostics.filter(function (e) {
-                                            var errFn = e.file;
-                                            return !!errFn && ts.comparePaths(utils.removeTestPathPrefixes(errFn.fileName), utils.removeTestPathPrefixes(inputFile.unitName), options && options.currentDirectory || "", !(options && options.caseSensitive)) === 0 /* EqualTo */;
-                                        });
-                                        // Header
-                                        outputLines += (newLine() + "==== " + inputFile.unitName + " (" + fileErrors.length + " errors) ====");
-                                        markedErrorCount = 0;
-                                        lineStarts = ts.computeLineStarts(inputFile.content);
-                                        lines = inputFile.content.split("\n");
-                                        if (lines.length === 1) {
-                                            lines = lines[0].split("\r");
-                                        }
-                                        lines.forEach(function (line, lineIndex) {
-                                            if (line.length > 0 && line.charAt(line.length - 1) === "\r") {
-                                                line = line.substr(0, line.length - 1);
-                                            }
-                                            var thisLineStart = lineStarts[lineIndex];
-                                            var nextLineStart;
-                                            // On the last line of the file, fake the next line start number so that we handle errors on the last character of the file correctly
-                                            if (lineIndex === lines.length - 1) {
-                                                nextLineStart = inputFile.content.length;
-                                            }
-                                            else {
-                                                nextLineStart = lineStarts[lineIndex + 1];
-                                            }
-                                            // Emit this line from the original file
-                                            outputLines += (newLine() + "    " + line);
-                                            fileErrors.forEach(function (errDiagnostic) {
-                                                var err = errDiagnostic; // TODO: GH#18217
-                                                // Does any error start or continue on to this line? Emit squiggles
-                                                var end = ts.textSpanEnd(err);
-                                                if ((end >= thisLineStart) && ((err.start < nextLineStart) || (lineIndex === lines.length - 1))) {
-                                                    // How many characters from the start of this line the error starts at (could be positive or negative)
-                                                    var relativeOffset = err.start - thisLineStart;
-                                                    // How many characters of the error are on this line (might be longer than this line in reality)
-                                                    var length = (end - err.start) - Math.max(0, thisLineStart - err.start);
-                                                    // Calculate the start of the squiggle
-                                                    var squiggleStart = Math.max(0, relativeOffset);
-                                                    // TODO/REVIEW: this doesn't work quite right in the browser if a multi file test has files whose names are just the right length relative to one another
-                                                    outputLines += (newLine() + "    " + line.substr(0, squiggleStart).replace(/[^\s]/g, " ") + new Array(Math.min(length, line.length - squiggleStart) + 1).join("~"));
-                                                    // If the error ended here, or we're at the end of the file, emit its message
-                                                    if ((lineIndex === lines.length - 1) || nextLineStart > end) {
-                                                        // Just like above, we need to do a split on a string instead of on a regex
-                                                        // because the JS engine does regexes wrong
-                                                        outputErrorText(errDiagnostic);
-                                                        markedErrorCount++;
-                                                    }
-                                                }
-                                            });
-                                        });
-                                        // Verify we didn't miss any errors in this file
-                                        assert.equal(markedErrorCount, fileErrors.length, "count of errors in " + inputFile.unitName);
-                                        isDupe = dupeCase.has(sanitizeTestFilePath(inputFile.unitName));
-                                        return [4 /*yield*/, [checkDuplicatedFileName(inputFile.unitName, dupeCase), outputLines, errorsReported]];
-                                    case 1:
-                                        _a.sent();
-                                        if (isDupe && !(options && options.caseSensitive)) {
-                                            // Case-duplicated files on a case-insensitive build will have errors reported in both the dupe and the original
-                                            // thanks to the canse-insensitive path comparison on the error file path - We only want to count those errors once
-                                            // for the assert below, so we subtract them here.
-                                            totalErrorsReportedInNonLibraryFiles -= errorsReported;
-                                        }
-                                        outputLines = "";
-                                        errorsReported = 0;
-                                        return [2 /*return*/];
-                                }
-                            });
-                        };
-                        _i = 0, _a = inputFiles.filter(function (f) { return f.content !== undefined; });
-                        _b.label = 3;
-                    case 3:
-                        if (!(_i < _a.length)) return [3 /*break*/, 6];
-                        inputFile = _a[_i];
-                        return [5 /*yield**/, _loop_1(inputFile)];
-                    case 4:
-                        _b.sent();
-                        _b.label = 5;
-                    case 5:
-                        _i++;
-                        return [3 /*break*/, 3];
-                    case 6:
-                        numLibraryDiagnostics = ts.countWhere(diagnostics, function (diagnostic) {
-                            return !!diagnostic.file && (isDefaultLibraryFile(diagnostic.file.fileName) || isBuiltFile(diagnostic.file.fileName));
-                        });
-                        numTest262HarnessDiagnostics = ts.countWhere(diagnostics, function (diagnostic) {
-                            // Count an error generated from tests262-harness folder.This should only apply for test262
-                            return !!diagnostic.file && diagnostic.file.fileName.indexOf("test262-harness") >= 0;
-                        });
-                        // Verify we didn't miss any errors in total
-                        assert.equal(totalErrorsReportedInNonLibraryFiles + numLibraryDiagnostics + numTest262HarnessDiagnostics, diagnostics.length, "total number of errors");
-                        return [2 /*return*/];
-                }
-            });
-        }
-        Compiler.iterateErrorBaseline = iterateErrorBaseline;
-        function doErrorBaseline(baselinePath, inputFiles, errors, pretty) {
-            Baseline.runBaseline(baselinePath.replace(/\.tsx?$/, ".errors.txt"), function () {
-                if (!errors || (errors.length === 0)) {
-                    /* tslint:disable:no-null-keyword */
-                    return null;
-                    /* tslint:enable:no-null-keyword */
-                }
-                return getErrorBaseline(inputFiles, errors, pretty);
-            });
-        }
-        Compiler.doErrorBaseline = doErrorBaseline;
-        function doTypeAndSymbolBaseline(baselinePath, program, allFiles, opts, multifile, skipTypeBaselines, skipSymbolBaselines) {
-            // The full walker simulates the types that you would get from doing a full
-            // compile.  The pull walker simulates the types you get when you just do
-            // a type query for a random node (like how the LS would do it).  Most of the
-            // time, these will be the same.  However, occasionally, they can be different.
-            // Specifically, when the compiler internally depends on symbol IDs to order
-            // things, then we may see different results because symbols can be created in a
-            // different order with 'pull' operations, and thus can produce slightly differing
-            // output.
-            //
-            // For example, with a full type check, we may see a type displayed as: number | string
-            // But with a pull type check, we may see it as:                        string | number
-            //
-            // These types are equivalent, but depend on what order the compiler observed
-            // certain parts of the program.
-            var fullWalker = new TypeWriterWalker(program, /*fullTypeCheck*/ true);
-            // Produce baselines.  The first gives the types for all expressions.
-            // The second gives symbols for all identifiers.
-            var typesError, symbolsError;
-            try {
-                checkBaseLines(/*isSymbolBaseLine*/ false);
-            }
-            catch (e) {
-                typesError = e;
-            }
-            try {
-                checkBaseLines(/*isSymbolBaseLine*/ true);
-            }
-            catch (e) {
-                symbolsError = e;
-            }
-            if (typesError && symbolsError) {
-                throw new Error(typesError.stack + Harness.IO.newLine() + symbolsError.stack);
-            }
-            if (typesError) {
-                throw typesError;
-            }
-            if (symbolsError) {
-                throw symbolsError;
-            }
-            return;
-            function checkBaseLines(isSymbolBaseLine) {
-                var fullExtension = isSymbolBaseLine ? ".symbols" : ".types";
-                // When calling this function from rwc-runner, the baselinePath will have no extension.
-                // As rwc test- file is stored in json which ".json" will get stripped off.
-                // When calling this function from compiler-runner, the baselinePath will then has either ".ts" or ".tsx" extension
-                var outputFileName = ts.endsWith(baselinePath, ".ts" /* Ts */) || ts.endsWith(baselinePath, ".tsx" /* Tsx */) ?
-                    baselinePath.replace(/\.tsx?/, "") : baselinePath;
-                if (!multifile) {
-                    var fullBaseLine_1 = generateBaseLine(isSymbolBaseLine, isSymbolBaseLine ? skipSymbolBaselines : skipTypeBaselines);
-                    Baseline.runBaseline(outputFileName + fullExtension, function () { return fullBaseLine_1; }, opts);
-                }
-                else {
-                    Baseline.runMultifileBaseline(outputFileName, fullExtension, function () {
-                        return iterateBaseLine(isSymbolBaseLine, isSymbolBaseLine ? skipSymbolBaselines : skipTypeBaselines);
-                    }, opts);
-                }
-            }
-            function generateBaseLine(isSymbolBaseline, skipBaseline) {
-                var _a;
-                var result = "";
-                var gen = iterateBaseLine(isSymbolBaseline, skipBaseline);
-                for (var _b = gen.next(), done = _b.done, value = _b.value; !done; _a = gen.next(), done = _a.done, value = _a.value, _a) {
-                    var content = value[1];
-                    result += content;
-                }
-                /* tslint:disable:no-null-keyword */
-                return result || null;
-                /* tslint:enable:no-null-keyword */
-            }
-            function iterateBaseLine(isSymbolBaseline, skipBaseline) {
-                var _a, dupeCase, _i, allFiles_1, file, unitName, typeLines, codeLines, gen, lastIndexWritten, _b, done, result, typeOrSymbolString, formattedLine, _c, codeLines_1, codeLine;
-                return __generator(this, function (_d) {
-                    switch (_d.label) {
-                        case 0:
-                            if (skipBaseline) {
-                                return [2 /*return*/];
-                            }
-                            dupeCase = ts.createMap();
-                            _i = 0, allFiles_1 = allFiles;
-                            _d.label = 1;
-                        case 1:
-                            if (!(_i < allFiles_1.length)) return [3 /*break*/, 4];
-                            file = allFiles_1[_i];
-                            unitName = file.unitName;
-                            typeLines = "=== " + unitName + " ===\r\n";
-                            codeLines = ts.flatMap(file.content.split(/\r?\n/g), function (e) { return e.split(/[\r\u2028\u2029]/g); });
-                            gen = isSymbolBaseline ? fullWalker.getSymbols(unitName) : fullWalker.getTypes(unitName);
-                            lastIndexWritten = void 0;
-                            for (_b = gen.next(), done = _b.done, result = _b.value; !done; _a = gen.next(), done = _a.done, result = _a.value, _a) {
-                                if (isSymbolBaseline && !result.symbol) {
-                                    return [2 /*return*/];
-                                }
-                                if (lastIndexWritten === undefined) {
-                                    typeLines += codeLines.slice(0, result.line + 1).join("\r\n") + "\r\n";
-                                }
-                                else if (result.line !== lastIndexWritten) {
-                                    if (!((lastIndexWritten + 1 < codeLines.length) && (codeLines[lastIndexWritten + 1].match(/^\s*[{|}]\s*$/) || codeLines[lastIndexWritten + 1].trim() === ""))) {
-                                        typeLines += "\r\n";
-                                    }
-                                    typeLines += codeLines.slice(lastIndexWritten + 1, result.line + 1).join("\r\n") + "\r\n";
-                                }
-                                lastIndexWritten = result.line;
-                                typeOrSymbolString = isSymbolBaseline ? result.symbol : result.type;
-                                formattedLine = result.sourceText.replace(/\r?\n/g, "") + " : " + typeOrSymbolString;
-                                typeLines += ">" + formattedLine + "\r\n";
-                            }
-                            // Preserve legacy behavior
-                            if (lastIndexWritten === undefined) {
-                                for (_c = 0, codeLines_1 = codeLines; _c < codeLines_1.length; _c++) {
-                                    codeLine = codeLines_1[_c];
-                                    typeLines += codeLine + "\r\nNo type information for this code.";
-                                }
-                            }
-                            else {
-                                if (lastIndexWritten + 1 < codeLines.length) {
-                                    if (!((lastIndexWritten + 1 < codeLines.length) && (codeLines[lastIndexWritten + 1].match(/^\s*[{|}]\s*$/) || codeLines[lastIndexWritten + 1].trim() === ""))) {
-                                        typeLines += "\r\n";
-                                    }
-                                    typeLines += codeLines.slice(lastIndexWritten + 1).join("\r\n");
-                                }
-                                typeLines += "\r\n";
-                            }
-                            return [4 /*yield*/, [checkDuplicatedFileName(unitName, dupeCase), utils.removeTestPathPrefixes(typeLines)]];
-                        case 2:
-                            _d.sent();
-                            _d.label = 3;
-                        case 3:
-                            _i++;
-                            return [3 /*break*/, 1];
-                        case 4: return [2 /*return*/];
-                    }
-                });
-            }
-        }
-        Compiler.doTypeAndSymbolBaseline = doTypeAndSymbolBaseline;
-        function doSourcemapBaseline(baselinePath, options, result, harnessSettings) {
-            var declMaps = ts.getAreDeclarationMapsEnabled(options);
-            if (options.inlineSourceMap) {
-                if (result.maps.size > 0 && !declMaps) {
-                    throw new Error("No sourcemap files should be generated if inlineSourceMaps was set.");
-                }
-                return;
-            }
-            else if (options.sourceMap || declMaps) {
-                if (result.maps.size !== (result.getNumberOfJsFiles() * (declMaps && options.sourceMap ? 2 : 1))) {
-                    throw new Error("Number of sourcemap files should be same as js files.");
-                }
-                Baseline.runBaseline(baselinePath.replace(/\.tsx?/, ".js.map"), function () {
-                    if ((options.noEmitOnError && result.diagnostics.length !== 0) || result.maps.size === 0) {
-                        // We need to return null here or the runBaseLine will actually create a empty file.
-                        // Baselining isn't required here because there is no output.
-                        /* tslint:disable:no-null-keyword */
-                        return null;
-                        /* tslint:enable:no-null-keyword */
-                    }
-                    var sourceMapCode = "";
-                    result.maps.forEach(function (sourceMap) {
-                        sourceMapCode += fileOutput(sourceMap, harnessSettings);
-                    });
-                    return sourceMapCode;
-                });
-            }
-        }
-        Compiler.doSourcemapBaseline = doSourcemapBaseline;
-        function doJsEmitBaseline(baselinePath, header, options, result, tsConfigFiles, toBeCompiled, otherFiles, harnessSettings) {
-            if (!options.noEmit && !options.emitDeclarationOnly && result.js.size === 0 && result.diagnostics.length === 0) {
-                throw new Error("Expected at least one js file to be emitted or at least one error to be created.");
-            }
-            // check js output
-            Baseline.runBaseline(baselinePath.replace(/\.tsx?/, ".js" /* Js */), function () {
-                var tsCode = "";
-                var tsSources = otherFiles.concat(toBeCompiled);
-                if (tsSources.length > 1) {
-                    tsCode += "//// [" + header + "] ////\r\n\r\n";
-                }
-                for (var i = 0; i < tsSources.length; i++) {
-                    tsCode += "//// [" + ts.getBaseFileName(tsSources[i].unitName) + "]\r\n";
-                    tsCode += tsSources[i].content + (i < (tsSources.length - 1) ? "\r\n" : "");
-                }
-                var jsCode = "";
-                result.js.forEach(function (file) {
-                    jsCode += fileOutput(file, harnessSettings);
-                });
-                if (result.dts.size > 0) {
-                    jsCode += "\r\n\r\n";
-                    result.dts.forEach(function (declFile) {
-                        jsCode += fileOutput(declFile, harnessSettings);
-                    });
-                }
-                var declFileContext = prepareDeclarationCompilationContext(toBeCompiled, otherFiles, result, harnessSettings, options, /*currentDirectory*/ undefined);
-                var declFileCompilationResult = compileDeclarationFiles(declFileContext);
-                if (declFileCompilationResult && declFileCompilationResult.declResult.diagnostics.length) {
-                    jsCode += "\r\n\r\n//// [DtsFileErrors]\r\n";
-                    jsCode += "\r\n\r\n";
-                    jsCode += getErrorBaseline(tsConfigFiles.concat(declFileCompilationResult.declInputFiles, declFileCompilationResult.declOtherFiles), declFileCompilationResult.declResult.diagnostics);
-                }
-                if (jsCode.length > 0) {
-                    return tsCode + "\r\n\r\n" + jsCode;
-                }
-                else {
-                    /* tslint:disable:no-null-keyword */
-                    return null;
-                    /* tslint:enable:no-null-keyword */
-                }
-            });
-        }
-        Compiler.doJsEmitBaseline = doJsEmitBaseline;
-        function fileOutput(file, harnessSettings) {
-            var fileName = harnessSettings.fullEmitPaths ? utils.removeTestPathPrefixes(file.file) : ts.getBaseFileName(file.file);
-            return "//// [" + fileName + "]\r\n" + utils.removeTestPathPrefixes(file.text);
-        }
-        function collateOutputs(outputFiles) {
-            var _a;
-            var gen = iterateOutputs(outputFiles);
-            // Emit them
-            var result = "";
-            for (var _b = gen.next(), done = _b.done, value = _b.value; !done; _a = gen.next(), done = _a.done, value = _a.value, _a) {
-                // Some extra spacing if this isn't the first file
-                if (result.length) {
-                    result += "\r\n\r\n";
-                }
-                // FileName header + content
-                var content = value[1];
-                result += content;
-            }
-            return result;
-        }
-        Compiler.collateOutputs = collateOutputs;
-        function iterateOutputs(outputFiles) {
-            function cleanName(fn) {
-                var lastSlash = ts.normalizeSlashes(fn).lastIndexOf("/");
-                return fn.substr(lastSlash + 1).toLowerCase();
-            }
-            var files, dupeCase, _i, files_1, outputFile;
-            return __generator(this, function (_a) {
-                switch (_a.label) {
-                    case 0:
-                        files = Array.from(outputFiles);
-                        files.slice().sort(function (a, b) { return ts.compareStringsCaseSensitive(cleanName(a.file), cleanName(b.file)); });
-                        dupeCase = ts.createMap();
-                        _i = 0, files_1 = files;
-                        _a.label = 1;
-                    case 1:
-                        if (!(_i < files_1.length)) return [3 /*break*/, 4];
-                        outputFile = files_1[_i];
-                        return [4 /*yield*/, [checkDuplicatedFileName(outputFile.file, dupeCase), "/*====== " + outputFile.file + " ======*/\r\n" + utils.removeByteOrderMark(outputFile.text)]];
-                    case 2:
-                        _a.sent();
-                        _a.label = 3;
-                    case 3:
-                        _i++;
-                        return [3 /*break*/, 1];
-                    case 4: return [2 /*return*/];
-                }
-            });
-        }
-        Compiler.iterateOutputs = iterateOutputs;
-        function checkDuplicatedFileName(resultName, dupeCase) {
-            resultName = sanitizeTestFilePath(resultName);
-            if (dupeCase.has(resultName)) {
-                // A different baseline filename should be manufactured if the names differ only in case, for windows compat
-                var count = 1 + dupeCase.get(resultName);
-                dupeCase.set(resultName, count);
-                resultName = resultName + ".dupe" + count;
-            }
-            else {
-                dupeCase.set(resultName, 0);
-            }
-            return resultName;
-        }
-        function sanitizeTestFilePath(name) {
-            var path = ts.toPath(ts.normalizeSlashes(name.replace(/[\^<>:"|?*%]/g, "_")).replace(/\.\.\//g, "__dotdot/"), "", Utils.canonicalizeForHarness);
-            if (ts.startsWith(path, "/")) {
-                return path.substring(1);
-            }
-            return path;
-        }
-        Compiler.sanitizeTestFilePath = sanitizeTestFilePath;
-    })(Compiler = Harness.Compiler || (Harness.Compiler = {}));
-    function splitVaryBySettingValue(text) {
-        if (!text)
-            return undefined;
-        var entries = text.split(/,/).map(function (s) { return s.trim().toLowerCase(); }).filter(function (s) { return s.length > 0; });
-        return entries && entries.length > 1 ? entries : undefined;
-    }
-    function computeFileBasedTestConfigurationVariations(configurations, variationState, varyByEntries, offset) {
-        if (offset >= varyByEntries.length) {
-            // make a copy of the current variation state
-            configurations.push(__assign({}, variationState));
-            return;
-        }
-        var _a = varyByEntries[offset], varyBy = _a[0], entries = _a[1];
-        for (var _i = 0, entries_2 = entries; _i < entries_2.length; _i++) {
-            var entry = entries_2[_i];
-            // set or overwrite the variation, then compute the next variation
-            variationState[varyBy] = entry;
-            computeFileBasedTestConfigurationVariations(configurations, variationState, varyByEntries, offset + 1);
-        }
-    }
-    /**
-     * Compute FileBasedTestConfiguration variations based on a supplied list of variable settings.
-     */
-    function getFileBasedTestConfigurations(settings, varyBy) {
-        var varyByEntries;
-        for (var _i = 0, varyBy_1 = varyBy; _i < varyBy_1.length; _i++) {
-            var varyByKey = varyBy_1[_i];
-            if (ts.hasProperty(settings, varyByKey)) {
-                // we only consider variations when there are 2 or more variable entries.
-                var entries = splitVaryBySettingValue(settings[varyByKey]);
-                if (entries) {
-                    if (!varyByEntries)
-                        varyByEntries = [];
-                    varyByEntries.push([varyByKey, entries]);
-                }
-            }
-        }
-        if (!varyByEntries)
-            return undefined;
-        var configurations = [];
-        computeFileBasedTestConfigurationVariations(configurations, /*variationState*/ {}, varyByEntries, /*offset*/ 0);
-        return configurations;
-    }
-    Harness.getFileBasedTestConfigurations = getFileBasedTestConfigurations;
-    /**
-     * Compute a description for this configuration based on its entries
-     */
-    function getFileBasedTestConfigurationDescription(configuration) {
-        var name = "";
-        if (configuration) {
-            var keys = Object.keys(configuration).sort();
-            for (var _i = 0, keys_1 = keys; _i < keys_1.length; _i++) {
-                var key = keys_1[_i];
-                if (name)
-                    name += ", ";
-                name += "@" + key + ": " + configuration[key];
-            }
-        }
-        return name;
-    }
-    Harness.getFileBasedTestConfigurationDescription = getFileBasedTestConfigurationDescription;
-    var TestCaseParser;
-    (function (TestCaseParser) {
-        // Regex for parsing options in the format "@Alpha: Value of any sort"
-        var optionRegex = /^[\/]{2}\s*@(\w+)\s*:\s*([^\r\n]*)/gm; // multiple matches on multiple lines
-        function extractCompilerSettings(content) {
-            var opts = {};
-            var match;
-            /* tslint:disable:no-null-keyword */
-            while ((match = optionRegex.exec(content)) !== null) {
-                /* tslint:enable:no-null-keyword */
-                opts[match[1]] = match[2].trim();
-            }
-            return opts;
-        }
-        TestCaseParser.extractCompilerSettings = extractCompilerSettings;
-        /** Given a test file containing // @FileName directives, return an array of named units of code to be added to an existing compiler instance */
-        function makeUnitsFromTest(code, fileName, rootDir, settings) {
-            if (settings === void 0) { settings = extractCompilerSettings(code); }
-            // List of all the subfiles we've parsed out
-            var testUnitData = [];
-            var lines = Utils.splitContentByNewlines(code);
-            // Stuff related to the subfile we're parsing
-            var currentFileContent;
-            var currentFileOptions = {};
-            var currentFileName;
-            var refs = [];
-            for (var _i = 0, lines_3 = lines; _i < lines_3.length; _i++) {
-                var line = lines_3[_i];
-                var testMetaData = optionRegex.exec(line);
-                if (testMetaData) {
-                    // Comment line, check for global/file @options and record them
-                    optionRegex.lastIndex = 0;
-                    var metaDataName = testMetaData[1].toLowerCase();
-                    currentFileOptions[testMetaData[1]] = testMetaData[2].trim();
-                    if (metaDataName !== "filename") {
-                        continue;
-                    }
-                    // New metadata statement after having collected some code to go with the previous metadata
-                    if (currentFileName) {
-                        // Store result file
-                        var newTestFile = {
-                            content: currentFileContent,
-                            name: currentFileName,
-                            fileOptions: currentFileOptions,
-                            originalFilePath: fileName,
-                            references: refs
-                        };
-                        testUnitData.push(newTestFile);
-                        // Reset local data
-                        currentFileContent = undefined;
-                        currentFileOptions = {};
-                        currentFileName = testMetaData[2].trim();
-                        refs = [];
-                    }
-                    else {
-                        // First metadata marker in the file
-                        currentFileName = testMetaData[2].trim();
-                    }
-                }
-                else {
-                    // Subfile content line
-                    // Append to the current subfile content, inserting a newline needed
-                    if (currentFileContent === undefined) {
-                        currentFileContent = "";
-                    }
-                    else if (currentFileContent !== "") {
-                        // End-of-line
-                        currentFileContent = currentFileContent + "\n";
-                    }
-                    currentFileContent = currentFileContent + line;
-                }
-            }
-            // normalize the fileName for the single file case
-            currentFileName = testUnitData.length > 0 || currentFileName ? currentFileName : ts.getBaseFileName(fileName);
-            // EOF, push whatever remains
-            var newTestFile2 = {
-                content: currentFileContent || "",
-                name: currentFileName,
-                fileOptions: currentFileOptions,
-                originalFilePath: fileName,
-                references: refs
-            };
-            testUnitData.push(newTestFile2);
-            // unit tests always list files explicitly
-            var parseConfigHost = {
-                useCaseSensitiveFileNames: false,
-                readDirectory: function () { return []; },
-                fileExists: function () { return true; },
-                readFile: function (name) { return ts.forEach(testUnitData, function (data) { return data.name.toLowerCase() === name.toLowerCase() ? data.content : undefined; }); }
-            };
-            // check if project has tsconfig.json in the list of files
-            var tsConfig;
-            var tsConfigFileUnitData;
-            for (var i = 0; i < testUnitData.length; i++) {
-                var data = testUnitData[i];
-                if (getConfigNameFromFileName(data.name)) {
-                    var configJson = ts.parseJsonText(data.name, data.content);
-                    assert.isTrue(configJson.endOfFileToken !== undefined);
-                    var baseDir = ts.normalizePath(ts.getDirectoryPath(data.name));
-                    if (rootDir) {
-                        baseDir = ts.getNormalizedAbsolutePath(baseDir, rootDir);
-                    }
-                    tsConfig = ts.parseJsonSourceFileConfigFileContent(configJson, parseConfigHost, baseDir);
-                    tsConfig.options.configFilePath = data.name;
-                    tsConfigFileUnitData = data;
-                    // delete entry from the list
-                    ts.orderedRemoveItemAt(testUnitData, i);
-                    break;
-                }
-            }
-            return { settings: settings, testUnitData: testUnitData, tsConfig: tsConfig, tsConfigFileUnitData: tsConfigFileUnitData };
-        }
-        TestCaseParser.makeUnitsFromTest = makeUnitsFromTest;
-    })(TestCaseParser = Harness.TestCaseParser || (Harness.TestCaseParser = {}));
-    /** Support class for baseline files */
-    var Baseline;
-    (function (Baseline) {
-        var noContent = "<no content>";
-        function localPath(fileName, baselineFolder, subfolder) {
-            if (baselineFolder === undefined) {
-                return baselinePath(fileName, "local", "tests/baselines", subfolder);
-            }
-            else {
-                return baselinePath(fileName, "local", baselineFolder, subfolder);
-            }
-        }
-        Baseline.localPath = localPath;
-        function referencePath(fileName, baselineFolder, subfolder) {
-            if (baselineFolder === undefined) {
-                return baselinePath(fileName, "reference", "tests/baselines", subfolder);
-            }
-            else {
-                return baselinePath(fileName, "reference", baselineFolder, subfolder);
-            }
-        }
-        function baselinePath(fileName, type, baselineFolder, subfolder) {
-            if (subfolder !== undefined) {
-                return Harness.userSpecifiedRoot + baselineFolder + "/" + subfolder + "/" + type + "/" + fileName;
-            }
-            else {
-                return Harness.userSpecifiedRoot + baselineFolder + "/" + type + "/" + fileName;
-            }
-        }
-        var fileCache = {};
-        function generateActual(generateContent) {
-            var actual = generateContent();
-            if (actual === undefined) {
-                throw new Error("The generated content was \"undefined\". Return \"null\" if no baselining is required.\"");
-            }
-            return actual;
-        }
-        function compareToBaseline(actual, relativeFileName, opts) {
-            // actual is now either undefined (the generator had an error), null (no file requested),
-            // or some real output of the function
-            if (actual === undefined) {
-                // Nothing to do
-                return undefined; // TODO: GH#18217
-            }
-            var refFileName = referencePath(relativeFileName, opts && opts.Baselinefolder, opts && opts.Subfolder);
-            /* tslint:disable:no-null-keyword */
-            if (actual === null) {
-                /* tslint:enable:no-null-keyword */
-                actual = noContent;
-            }
-            var expected = "<no content>";
-            if (Harness.IO.fileExists(refFileName)) {
-                expected = Harness.IO.readFile(refFileName); // TODO: GH#18217
-            }
-            return { expected: expected, actual: actual };
-        }
-        function writeComparison(expected, actual, relativeFileName, actualFileName) {
-            // For now this is written using TypeScript, because sys is not available when running old test cases.
-            // But we need to move to sys once we have
-            // Creates the directory including its parent if not already present
-            function createDirectoryStructure(dirName) {
-                if (fileCache[dirName] || Harness.IO.directoryExists(dirName)) {
-                    fileCache[dirName] = true;
-                    return;
-                }
-                var parentDirectory = Harness.IO.directoryName(dirName); // TODO: GH#18217
-                if (parentDirectory !== "" && parentDirectory !== dirName) {
-                    createDirectoryStructure(parentDirectory);
-                }
-                Harness.IO.createDirectory(dirName);
-                fileCache[dirName] = true;
-            }
-            // Create folders if needed
-            createDirectoryStructure(Harness.IO.directoryName(actualFileName)); // TODO: GH#18217
-            // Delete the actual file in case it fails
-            if (Harness.IO.fileExists(actualFileName)) {
-                Harness.IO.deleteFile(actualFileName);
-            }
-            var encodedActual = Utils.encodeString(actual);
-            if (expected !== encodedActual) {
-                if (actual === noContent) {
-                    Harness.IO.writeFile(actualFileName + ".delete", "");
-                }
-                else {
-                    Harness.IO.writeFile(actualFileName, encodedActual);
-                }
-                throw new Error("The baseline file " + relativeFileName + " has changed.");
-            }
-        }
-        function runBaseline(relativeFileName, generateContent, opts) {
-            var actualFileName = localPath(relativeFileName, opts && opts.Baselinefolder, opts && opts.Subfolder);
-            var actual = generateActual(generateContent);
-            var comparison = compareToBaseline(actual, relativeFileName, opts);
-            writeComparison(comparison.expected, comparison.actual, relativeFileName, actualFileName);
-        }
-        Baseline.runBaseline = runBaseline;
-        function runMultifileBaseline(relativeFileBase, extension, generateContent, opts, referencedExtensions) {
-            var _a;
-            var gen = generateContent();
-            var writtenFiles = ts.createMap();
-            var errors = [];
-            // tslint:disable-next-line:no-null-keyword
-            if (gen !== null) {
-                for (var _b = gen.next(), done = _b.done, value = _b.value; !done; _a = gen.next(), done = _a.done, value = _a.value, _a) {
-                    var _c = value, name = _c[0], content = _c[1], count = _c[2];
-                    if (count === 0)
-                        continue; // Allow error reporter to skip writing files without errors
-                    var relativeFileName = relativeFileBase + "/" + name + extension;
-                    var actualFileName = localPath(relativeFileName, opts && opts.Baselinefolder, opts && opts.Subfolder);
-                    var comparison = compareToBaseline(content, relativeFileName, opts);
-                    try {
-                        writeComparison(comparison.expected, comparison.actual, relativeFileName, actualFileName);
-                    }
-                    catch (e) {
-                        errors.push(e);
-                    }
-                    writtenFiles.set(relativeFileName, true);
-                }
-            }
-            var referenceDir = referencePath(relativeFileBase, opts && opts.Baselinefolder, opts && opts.Subfolder);
-            var existing = Harness.IO.readDirectory(referenceDir, referencedExtensions || [extension]);
-            if (extension === ".ts" || referencedExtensions && referencedExtensions.indexOf(".ts") > -1 && referencedExtensions.indexOf(".d.ts") === -1) {
-                // special-case and filter .d.ts out of .ts results
-                existing = existing.filter(function (f) { return !ts.endsWith(f, ".d.ts"); });
-            }
-            var missing = [];
-            for (var _i = 0, existing_1 = existing; _i < existing_1.length; _i++) {
-                var name = existing_1[_i];
-                var localCopy = name.substring(referenceDir.length - relativeFileBase.length);
-                if (!writtenFiles.has(localCopy)) {
-                    missing.push(localCopy);
-                }
-            }
-            if (missing.length) {
-                for (var _d = 0, missing_1 = missing; _d < missing_1.length; _d++) {
-                    var file = missing_1[_d];
-                    Harness.IO.writeFile(localPath(file + ".delete", opts && opts.Baselinefolder, opts && opts.Subfolder), "");
-                }
-            }
-            if (errors.length || missing.length) {
-                var errorMsg = "";
-                if (errors.length) {
-                    errorMsg += "The baseline for " + relativeFileBase + " in " + errors.length + " files has changed:" + ("\n    " + errors.slice(0, 5).map(function (e) { return e.message; }).join("\n    ") + (errors.length > 5 ? "\n" + ("    and " + (errors.length - 5) + " more") : ""));
-                }
-                if (errors.length && missing.length) {
-                    errorMsg += "\n";
-                }
-                if (missing.length) {
-                    var writtenFilesArray = ts.arrayFrom(writtenFiles.keys());
-                    errorMsg += "Baseline missing " + missing.length + " files:" + ("\n    " + missing.slice(0, 5).join("\n    ") + (missing.length > 5 ? "\n" + ("    and " + (missing.length - 5) + " more") : "") + "\n") + "Written " + writtenFiles.size + " files:" + ("\n    " + writtenFilesArray.slice(0, 5).join("\n    ") + (writtenFilesArray.length > 5 ? "\n" + ("    and " + (writtenFilesArray.length - 5) + " more") : ""));
-                }
-                throw new Error(errorMsg);
-            }
-        }
-        Baseline.runMultifileBaseline = runMultifileBaseline;
-    })(Baseline = Harness.Baseline || (Harness.Baseline = {}));
-    function isDefaultLibraryFile(filePath) {
-        // We need to make sure that the filePath is prefixed with "lib." not just containing "lib." and end with ".d.ts"
-        var fileName = ts.getBaseFileName(ts.normalizeSlashes(filePath));
-        return ts.startsWith(fileName, "lib.") && ts.endsWith(fileName, ".d.ts" /* Dts */);
-    }
-    Harness.isDefaultLibraryFile = isDefaultLibraryFile;
-    function isBuiltFile(filePath) {
-        return filePath.indexOf(Harness.libFolder) === 0 ||
-            filePath.indexOf(vpath.addTrailingSeparator(vfs.builtFolder)) === 0;
-    }
-    Harness.isBuiltFile = isBuiltFile;
-    function getDefaultLibraryFile(filePath, io) {
-        var libFile = Harness.userSpecifiedRoot + Harness.libFolder + ts.getBaseFileName(ts.normalizeSlashes(filePath));
-        return { unitName: libFile, content: io.readFile(libFile) };
-    }
-    Harness.getDefaultLibraryFile = getDefaultLibraryFile;
-    function getConfigNameFromFileName(filename) {
-        var flc = ts.getBaseFileName(filename).toLowerCase();
-        return ts.find(["tsconfig.json", "jsconfig.json"], function (x) { return x === flc; });
-    }
-    Harness.getConfigNameFromFileName = getConfigNameFromFileName;
-    if (Error)
-        Error.stackTraceLimit = 100;
-})(Harness || (Harness = {}));
-var Harness;
-(function (Harness) {
-    var LanguageService;
-    (function (LanguageService) {
-        var ScriptInfo = /** @class */ (function () {
-            function ScriptInfo(fileName, content, isRootFile) {
-                this.fileName = fileName;
-                this.content = content;
-                this.isRootFile = isRootFile;
-                this.version = 1;
-                this.editRanges = [];
-                this.setContent(content);
-            }
-            ScriptInfo.prototype.setContent = function (content) {
-                this.content = content;
-                this.lineMap = undefined;
-            };
-            ScriptInfo.prototype.getLineMap = function () {
-                return this.lineMap || (this.lineMap = ts.computeLineStarts(this.content));
-            };
-            ScriptInfo.prototype.updateContent = function (content) {
-                this.editRanges = [];
-                this.setContent(content);
-                this.version++;
-            };
-            ScriptInfo.prototype.editContent = function (start, end, newText) {
-                // Apply edits
-                var prefix = this.content.substring(0, start);
-                var middle = newText;
-                var suffix = this.content.substring(end);
-                this.setContent(prefix + middle + suffix);
-                // Store edit range + new length of script
-                this.editRanges.push({
-                    length: this.content.length,
-                    textChangeRange: ts.createTextChangeRange(ts.createTextSpanFromBounds(start, end), newText.length)
-                });
-                // Update version #
-                this.version++;
-            };
-            ScriptInfo.prototype.getTextChangeRangeBetweenVersions = function (startVersion, endVersion) {
-                if (startVersion === endVersion) {
-                    // No edits!
-                    return ts.unchangedTextChangeRange;
-                }
-                var initialEditRangeIndex = this.editRanges.length - (this.version - startVersion);
-                var lastEditRangeIndex = this.editRanges.length - (this.version - endVersion);
-                var entries = this.editRanges.slice(initialEditRangeIndex, lastEditRangeIndex);
-                return ts.collapseTextChangeRangesAcrossMultipleVersions(entries.map(function (e) { return e.textChangeRange; }));
-            };
-            return ScriptInfo;
-        }());
-        LanguageService.ScriptInfo = ScriptInfo;
-        var ScriptSnapshot = /** @class */ (function () {
-            function ScriptSnapshot(scriptInfo) {
-                this.scriptInfo = scriptInfo;
-                this.textSnapshot = scriptInfo.content;
-                this.version = scriptInfo.version;
-            }
-            ScriptSnapshot.prototype.getText = function (start, end) {
-                return this.textSnapshot.substring(start, end);
-            };
-            ScriptSnapshot.prototype.getLength = function () {
-                return this.textSnapshot.length;
-            };
-            ScriptSnapshot.prototype.getChangeRange = function (oldScript) {
-                var oldShim = oldScript;
-                return this.scriptInfo.getTextChangeRangeBetweenVersions(oldShim.version, this.version);
-            };
-            return ScriptSnapshot;
-        }());
-        var ScriptSnapshotProxy = /** @class */ (function () {
-            function ScriptSnapshotProxy(scriptSnapshot) {
-                this.scriptSnapshot = scriptSnapshot;
-            }
-            ScriptSnapshotProxy.prototype.getText = function (start, end) {
-                return this.scriptSnapshot.getText(start, end);
-            };
-            ScriptSnapshotProxy.prototype.getLength = function () {
-                return this.scriptSnapshot.getLength();
-            };
-            ScriptSnapshotProxy.prototype.getChangeRange = function (oldScript) {
-                var range = this.scriptSnapshot.getChangeRange(oldScript.scriptSnapshot);
-                return range && JSON.stringify(range);
-            };
-            return ScriptSnapshotProxy;
-        }());
-        var DefaultHostCancellationToken = /** @class */ (function () {
-            function DefaultHostCancellationToken() {
-            }
-            DefaultHostCancellationToken.prototype.isCancellationRequested = function () {
-                return false;
-            };
-            DefaultHostCancellationToken.instance = new DefaultHostCancellationToken();
-            return DefaultHostCancellationToken;
-        }());
-        var LanguageServiceAdapterHost = /** @class */ (function () {
-            function LanguageServiceAdapterHost(cancellationToken, settings) {
-                if (cancellationToken === void 0) { cancellationToken = DefaultHostCancellationToken.instance; }
-                if (settings === void 0) { settings = ts.getDefaultCompilerOptions(); }
-                this.cancellationToken = cancellationToken;
-                this.settings = settings;
-                this.sys = new fakes.System(new vfs.FileSystem(/*ignoreCase*/ true, { cwd: Harness.virtualFileSystemRoot }));
-                this.scriptInfos = new collections.SortedMap({ comparer: this.vfs.stringComparer, sort: "insertion" });
-            }
-            Object.defineProperty(LanguageServiceAdapterHost.prototype, "vfs", {
-                get: function () {
-                    return this.sys.vfs;
-                },
-                enumerable: true,
-                configurable: true
-            });
-            LanguageServiceAdapterHost.prototype.getNewLine = function () {
-                return Harness.harnessNewLine;
-            };
-            LanguageServiceAdapterHost.prototype.getFilenames = function () {
-                var fileNames = [];
-                this.scriptInfos.forEach(function (scriptInfo) {
-                    if (scriptInfo.isRootFile) {
-                        // only include root files here
-                        // usually it means that we won't include lib.d.ts in the list of root files so it won't mess the computation of compilation root dir.
-                        fileNames.push(scriptInfo.fileName);
-                    }
-                });
-                return fileNames;
-            };
-            LanguageServiceAdapterHost.prototype.getScriptInfo = function (fileName) {
-                return this.scriptInfos.get(vpath.resolve(this.vfs.cwd(), fileName));
-            };
-            LanguageServiceAdapterHost.prototype.addScript = function (fileName, content, isRootFile) {
-                this.vfs.mkdirpSync(vpath.dirname(fileName));
-                this.vfs.writeFileSync(fileName, content);
-                this.scriptInfos.set(vpath.resolve(this.vfs.cwd(), fileName), new ScriptInfo(fileName, content, isRootFile));
-            };
-            LanguageServiceAdapterHost.prototype.editScript = function (fileName, start, end, newText) {
-                var script = this.getScriptInfo(fileName);
-                if (script) {
-                    script.editContent(start, end, newText);
-                    this.vfs.mkdirpSync(vpath.dirname(fileName));
-                    this.vfs.writeFileSync(fileName, script.content);
-                    return;
-                }
-                throw new Error("No script with name '" + fileName + "'");
-            };
-            LanguageServiceAdapterHost.prototype.openFile = function (_fileName, _content, _scriptKindName) { };
-            /**
-             * @param line 0 based index
-             * @param col 0 based index
-             */
-            LanguageServiceAdapterHost.prototype.positionToLineAndCharacter = function (fileName, position) {
-                var script = this.getScriptInfo(fileName);
-                assert.isOk(script);
-                return ts.computeLineAndCharacterOfPosition(script.getLineMap(), position);
-            };
-            return LanguageServiceAdapterHost;
-        }());
-        LanguageService.LanguageServiceAdapterHost = LanguageServiceAdapterHost;
-        /// Native adapter
-        var NativeLanguageServiceHost = /** @class */ (function (_super) {
-            __extends(NativeLanguageServiceHost, _super);
-            function NativeLanguageServiceHost() {
-                var _this = _super !== null && _super.apply(this, arguments) || this;
-                _this.installPackage = ts.notImplemented;
-                _this.log = ts.noop;
-                _this.trace = ts.noop;
-                _this.error = ts.noop;
-                return _this;
-            }
-            NativeLanguageServiceHost.prototype.isKnownTypesPackageName = function (name) {
-                return !!this.typesRegistry && this.typesRegistry.has(name);
-            };
-            NativeLanguageServiceHost.prototype.getCompilationSettings = function () { return this.settings; };
-            NativeLanguageServiceHost.prototype.getCancellationToken = function () { return this.cancellationToken; };
-            NativeLanguageServiceHost.prototype.getDirectories = function (path) {
-                return this.sys.getDirectories(path);
-            };
-            NativeLanguageServiceHost.prototype.getCurrentDirectory = function () { return Harness.virtualFileSystemRoot; };
-            NativeLanguageServiceHost.prototype.getDefaultLibFileName = function () { return Harness.Compiler.defaultLibFileName; };
-            NativeLanguageServiceHost.prototype.getScriptFileNames = function () {
-                return this.getFilenames().filter(ts.isAnySupportedFileExtension);
-            };
-            NativeLanguageServiceHost.prototype.getScriptSnapshot = function (fileName) {
-                var script = this.getScriptInfo(fileName);
-                return script ? new ScriptSnapshot(script) : undefined;
-            };
-            NativeLanguageServiceHost.prototype.getScriptKind = function () { return 0 /* Unknown */; };
-            NativeLanguageServiceHost.prototype.getScriptVersion = function (fileName) {
-                var script = this.getScriptInfo(fileName);
-                return script ? script.version.toString() : undefined; // TODO: GH#18217
-            };
-            NativeLanguageServiceHost.prototype.directoryExists = function (dirName) {
-                return this.sys.directoryExists(dirName);
-            };
-            NativeLanguageServiceHost.prototype.fileExists = function (fileName) {
-                return this.sys.fileExists(fileName);
-            };
-            NativeLanguageServiceHost.prototype.readDirectory = function (path, extensions, exclude, include, depth) {
-                return this.sys.readDirectory(path, extensions, exclude, include, depth);
-            };
-            NativeLanguageServiceHost.prototype.readFile = function (path) {
-                return this.sys.readFile(path);
-            };
-            NativeLanguageServiceHost.prototype.realpath = function (path) {
-                return this.sys.realpath(path);
-            };
-            NativeLanguageServiceHost.prototype.getTypeRootsVersion = function () {
-                return 0;
-            };
-            return NativeLanguageServiceHost;
-        }(LanguageServiceAdapterHost));
-        var NativeLanguageServiceAdapter = /** @class */ (function () {
-            function NativeLanguageServiceAdapter(cancellationToken, options) {
-                this.host = new NativeLanguageServiceHost(cancellationToken, options);
-            }
-            NativeLanguageServiceAdapter.prototype.getHost = function () { return this.host; };
-            NativeLanguageServiceAdapter.prototype.getLanguageService = function () { return ts.createLanguageService(this.host); };
-            NativeLanguageServiceAdapter.prototype.getClassifier = function () { return ts.createClassifier(); };
-            NativeLanguageServiceAdapter.prototype.getPreProcessedFileInfo = function (fileName, fileContents) { return ts.preProcessFile(fileContents, /* readImportFiles */ true, ts.hasJavaScriptFileExtension(fileName)); };
-            return NativeLanguageServiceAdapter;
-        }());
-        LanguageService.NativeLanguageServiceAdapter = NativeLanguageServiceAdapter;
-        /// Shim adapter
-        var ShimLanguageServiceHost = /** @class */ (function (_super) {
-            __extends(ShimLanguageServiceHost, _super);
-            function ShimLanguageServiceHost(preprocessToResolve, cancellationToken, options) {
-                var _this = _super.call(this, cancellationToken, options) || this;
-                _this.readDirectory = ts.notImplemented;
-                _this.readDirectoryNames = ts.notImplemented;
-                _this.readFileNames = ts.notImplemented;
-                _this.nativeHost = new NativeLanguageServiceHost(cancellationToken, options);
-                if (preprocessToResolve) {
-                    var compilerOptions_1 = _this.nativeHost.getCompilationSettings();
-                    var moduleResolutionHost_1 = {
-                        fileExists: function (fileName) { return _this.getScriptInfo(fileName) !== undefined; },
-                        readFile: function (fileName) {
-                            var scriptInfo = _this.getScriptInfo(fileName);
-                            return scriptInfo && scriptInfo.content;
-                        }
-                    };
-                    _this.getModuleResolutionsForFile = function (fileName) {
-                        var scriptInfo = _this.getScriptInfo(fileName);
-                        var preprocessInfo = ts.preProcessFile(scriptInfo.content, /*readImportFiles*/ true);
-                        var imports = {};
-                        for (var _i = 0, _a = preprocessInfo.importedFiles; _i < _a.length; _i++) {
-                            var module_1 = _a[_i];
-                            var resolutionInfo = ts.resolveModuleName(module_1.fileName, fileName, compilerOptions_1, moduleResolutionHost_1);
-                            if (resolutionInfo.resolvedModule) {
-                                imports[module_1.fileName] = resolutionInfo.resolvedModule.resolvedFileName;
-                            }
-                        }
-                        return JSON.stringify(imports);
-                    };
-                    _this.getTypeReferenceDirectiveResolutionsForFile = function (fileName) {
-                        var scriptInfo = _this.getScriptInfo(fileName);
-                        if (scriptInfo) {
-                            var preprocessInfo = ts.preProcessFile(scriptInfo.content, /*readImportFiles*/ false);
-                            var resolutions = {};
-                            var settings = _this.nativeHost.getCompilationSettings();
-                            for (var _i = 0, _a = preprocessInfo.typeReferenceDirectives; _i < _a.length; _i++) {
-                                var typeReferenceDirective = _a[_i];
-                                var resolutionInfo = ts.resolveTypeReferenceDirective(typeReferenceDirective.fileName, fileName, settings, moduleResolutionHost_1);
-                                if (resolutionInfo.resolvedTypeReferenceDirective.resolvedFileName) {
-                                    resolutions[typeReferenceDirective.fileName] = resolutionInfo.resolvedTypeReferenceDirective;
-                                }
-                            }
-                            return JSON.stringify(resolutions);
-                        }
-                        else {
-                            return "[]";
-                        }
-                    };
-                }
-                return _this;
-            }
-            ShimLanguageServiceHost.prototype.getFilenames = function () { return this.nativeHost.getFilenames(); };
-            ShimLanguageServiceHost.prototype.getScriptInfo = function (fileName) { return this.nativeHost.getScriptInfo(fileName); };
-            ShimLanguageServiceHost.prototype.addScript = function (fileName, content, isRootFile) { this.nativeHost.addScript(fileName, content, isRootFile); };
-            ShimLanguageServiceHost.prototype.editScript = function (fileName, start, end, newText) { this.nativeHost.editScript(fileName, start, end, newText); };
-            ShimLanguageServiceHost.prototype.positionToLineAndCharacter = function (fileName, position) { return this.nativeHost.positionToLineAndCharacter(fileName, position); };
-            ShimLanguageServiceHost.prototype.getCompilationSettings = function () { return JSON.stringify(this.nativeHost.getCompilationSettings()); };
-            ShimLanguageServiceHost.prototype.getCancellationToken = function () { return this.nativeHost.getCancellationToken(); };
-            ShimLanguageServiceHost.prototype.getCurrentDirectory = function () { return this.nativeHost.getCurrentDirectory(); };
-            ShimLanguageServiceHost.prototype.getDirectories = function (path) { return JSON.stringify(this.nativeHost.getDirectories(path)); };
-            ShimLanguageServiceHost.prototype.getDefaultLibFileName = function () { return this.nativeHost.getDefaultLibFileName(); };
-            ShimLanguageServiceHost.prototype.getScriptFileNames = function () { return JSON.stringify(this.nativeHost.getScriptFileNames()); };
-            ShimLanguageServiceHost.prototype.getScriptSnapshot = function (fileName) {
-                var nativeScriptSnapshot = this.nativeHost.getScriptSnapshot(fileName); // TODO: GH#18217
-                return nativeScriptSnapshot && new ScriptSnapshotProxy(nativeScriptSnapshot);
-            };
-            ShimLanguageServiceHost.prototype.getScriptKind = function () { return this.nativeHost.getScriptKind(); };
-            ShimLanguageServiceHost.prototype.getScriptVersion = function (fileName) { return this.nativeHost.getScriptVersion(fileName); };
-            ShimLanguageServiceHost.prototype.getLocalizedDiagnosticMessages = function () { return JSON.stringify({}); };
-            ShimLanguageServiceHost.prototype.fileExists = function (fileName) { return this.getScriptInfo(fileName) !== undefined; };
-            ShimLanguageServiceHost.prototype.readFile = function (fileName) {
-                var snapshot = this.nativeHost.getScriptSnapshot(fileName);
-                return snapshot && ts.getSnapshotText(snapshot);
-            };
-            ShimLanguageServiceHost.prototype.log = function (s) { this.nativeHost.log(s); };
-            ShimLanguageServiceHost.prototype.trace = function (s) { this.nativeHost.trace(s); };
-            ShimLanguageServiceHost.prototype.error = function (s) { this.nativeHost.error(s); };
-            ShimLanguageServiceHost.prototype.directoryExists = function () {
-                // for tests pessimistically assume that directory always exists
-                return true;
-            };
-            return ShimLanguageServiceHost;
-        }(LanguageServiceAdapterHost));
-        var ClassifierShimProxy = /** @class */ (function () {
-            function ClassifierShimProxy(shim) {
-                this.shim = shim;
-            }
-            ClassifierShimProxy.prototype.getEncodedLexicalClassifications = function (_text, _lexState, _classifyKeywordsInGenerics) {
-                return ts.notImplemented();
-            };
-            ClassifierShimProxy.prototype.getClassificationsForLine = function (text, lexState, classifyKeywordsInGenerics) {
-                var result = this.shim.getClassificationsForLine(text, lexState, classifyKeywordsInGenerics).split("\n");
-                var entries = [];
-                var i = 0;
-                var position = 0;
-                for (; i < result.length - 1; i += 2) {
-                    var t = entries[i / 2] = {
-                        length: parseInt(result[i]),
-                        classification: parseInt(result[i + 1])
-                    };
-                    assert.isTrue(t.length > 0, "Result length should be greater than 0, got :" + t.length);
-                    position += t.length;
-                }
-                var finalLexState = parseInt(result[result.length - 1]);
-                assert.equal(position, text.length, "Expected cumulative length of all entries to match the length of the source. expected: " + text.length + ", but got: " + position);
-                return {
-                    finalLexState: finalLexState,
-                    entries: entries
-                };
-            };
-            return ClassifierShimProxy;
-        }());
-        function unwrapJSONCallResult(result) {
-            var parsedResult = JSON.parse(result);
-            if (parsedResult.error) {
-                throw new Error("Language Service Shim Error: " + JSON.stringify(parsedResult.error));
-            }
-            else if (parsedResult.canceled) {
-                throw new ts.OperationCanceledException();
-            }
-            return parsedResult.result;
-        }
-        var LanguageServiceShimProxy = /** @class */ (function () {
-            function LanguageServiceShimProxy(shim) {
-                this.shim = shim;
-                this.getCombinedCodeFix = ts.notImplemented;
-                this.applyCodeActionCommand = ts.notImplemented;
-            }
-            LanguageServiceShimProxy.prototype.cleanupSemanticCache = function () {
-                this.shim.cleanupSemanticCache();
-            };
-            LanguageServiceShimProxy.prototype.getSyntacticDiagnostics = function (fileName) {
-                return unwrapJSONCallResult(this.shim.getSyntacticDiagnostics(fileName));
-            };
-            LanguageServiceShimProxy.prototype.getSemanticDiagnostics = function (fileName) {
-                return unwrapJSONCallResult(this.shim.getSemanticDiagnostics(fileName));
-            };
-            LanguageServiceShimProxy.prototype.getSuggestionDiagnostics = function (fileName) {
-                return unwrapJSONCallResult(this.shim.getSuggestionDiagnostics(fileName));
-            };
-            LanguageServiceShimProxy.prototype.getCompilerOptionsDiagnostics = function () {
-                return unwrapJSONCallResult(this.shim.getCompilerOptionsDiagnostics());
-            };
-            LanguageServiceShimProxy.prototype.getSyntacticClassifications = function (fileName, span) {
-                return unwrapJSONCallResult(this.shim.getSyntacticClassifications(fileName, span.start, span.length));
-            };
-            LanguageServiceShimProxy.prototype.getSemanticClassifications = function (fileName, span) {
-                return unwrapJSONCallResult(this.shim.getSemanticClassifications(fileName, span.start, span.length));
-            };
-            LanguageServiceShimProxy.prototype.getEncodedSyntacticClassifications = function (fileName, span) {
-                return unwrapJSONCallResult(this.shim.getEncodedSyntacticClassifications(fileName, span.start, span.length));
-            };
-            LanguageServiceShimProxy.prototype.getEncodedSemanticClassifications = function (fileName, span) {
-                return unwrapJSONCallResult(this.shim.getEncodedSemanticClassifications(fileName, span.start, span.length));
-            };
-            LanguageServiceShimProxy.prototype.getCompletionsAtPosition = function (fileName, position, preferences) {
-                return unwrapJSONCallResult(this.shim.getCompletionsAtPosition(fileName, position, preferences));
-            };
-            LanguageServiceShimProxy.prototype.getCompletionEntryDetails = function (fileName, position, entryName, formatOptions, source, preferences) {
-                return unwrapJSONCallResult(this.shim.getCompletionEntryDetails(fileName, position, entryName, JSON.stringify(formatOptions), source, preferences));
-            };
-            LanguageServiceShimProxy.prototype.getCompletionEntrySymbol = function () {
-                throw new Error("getCompletionEntrySymbol not implemented across the shim layer.");
-            };
-            LanguageServiceShimProxy.prototype.getQuickInfoAtPosition = function (fileName, position) {
-                return unwrapJSONCallResult(this.shim.getQuickInfoAtPosition(fileName, position));
-            };
-            LanguageServiceShimProxy.prototype.getNameOrDottedNameSpan = function (fileName, startPos, endPos) {
-                return unwrapJSONCallResult(this.shim.getNameOrDottedNameSpan(fileName, startPos, endPos));
-            };
-            LanguageServiceShimProxy.prototype.getBreakpointStatementAtPosition = function (fileName, position) {
-                return unwrapJSONCallResult(this.shim.getBreakpointStatementAtPosition(fileName, position));
-            };
-            LanguageServiceShimProxy.prototype.getSignatureHelpItems = function (fileName, position) {
-                return unwrapJSONCallResult(this.shim.getSignatureHelpItems(fileName, position));
-            };
-            LanguageServiceShimProxy.prototype.getRenameInfo = function (fileName, position) {
-                return unwrapJSONCallResult(this.shim.getRenameInfo(fileName, position));
-            };
-            LanguageServiceShimProxy.prototype.findRenameLocations = function (fileName, position, findInStrings, findInComments) {
-                return unwrapJSONCallResult(this.shim.findRenameLocations(fileName, position, findInStrings, findInComments));
-            };
-            LanguageServiceShimProxy.prototype.getDefinitionAtPosition = function (fileName, position) {
-                return unwrapJSONCallResult(this.shim.getDefinitionAtPosition(fileName, position));
-            };
-            LanguageServiceShimProxy.prototype.getDefinitionAndBoundSpan = function (fileName, position) {
-                return unwrapJSONCallResult(this.shim.getDefinitionAndBoundSpan(fileName, position));
-            };
-            LanguageServiceShimProxy.prototype.getTypeDefinitionAtPosition = function (fileName, position) {
-                return unwrapJSONCallResult(this.shim.getTypeDefinitionAtPosition(fileName, position));
-            };
-            LanguageServiceShimProxy.prototype.getImplementationAtPosition = function (fileName, position) {
-                return unwrapJSONCallResult(this.shim.getImplementationAtPosition(fileName, position));
-            };
-            LanguageServiceShimProxy.prototype.getReferencesAtPosition = function (fileName, position) {
-                return unwrapJSONCallResult(this.shim.getReferencesAtPosition(fileName, position));
-            };
-            LanguageServiceShimProxy.prototype.findReferences = function (fileName, position) {
-                return unwrapJSONCallResult(this.shim.findReferences(fileName, position));
-            };
-            LanguageServiceShimProxy.prototype.getOccurrencesAtPosition = function (fileName, position) {
-                return unwrapJSONCallResult(this.shim.getOccurrencesAtPosition(fileName, position));
-            };
-            LanguageServiceShimProxy.prototype.getDocumentHighlights = function (fileName, position, filesToSearch) {
-                return unwrapJSONCallResult(this.shim.getDocumentHighlights(fileName, position, JSON.stringify(filesToSearch)));
-            };
-            LanguageServiceShimProxy.prototype.getNavigateToItems = function (searchValue) {
-                return unwrapJSONCallResult(this.shim.getNavigateToItems(searchValue));
-            };
-            LanguageServiceShimProxy.prototype.getNavigationBarItems = function (fileName) {
-                return unwrapJSONCallResult(this.shim.getNavigationBarItems(fileName));
-            };
-            LanguageServiceShimProxy.prototype.getNavigationTree = function (fileName) {
-                return unwrapJSONCallResult(this.shim.getNavigationTree(fileName));
-            };
-            LanguageServiceShimProxy.prototype.getOutliningSpans = function (fileName) {
-                return unwrapJSONCallResult(this.shim.getOutliningSpans(fileName));
-            };
-            LanguageServiceShimProxy.prototype.getTodoComments = function (fileName, descriptors) {
-                return unwrapJSONCallResult(this.shim.getTodoComments(fileName, JSON.stringify(descriptors)));
-            };
-            LanguageServiceShimProxy.prototype.getBraceMatchingAtPosition = function (fileName, position) {
-                return unwrapJSONCallResult(this.shim.getBraceMatchingAtPosition(fileName, position));
-            };
-            LanguageServiceShimProxy.prototype.getIndentationAtPosition = function (fileName, position, options) {
-                return unwrapJSONCallResult(this.shim.getIndentationAtPosition(fileName, position, JSON.stringify(options)));
-            };
-            LanguageServiceShimProxy.prototype.getFormattingEditsForRange = function (fileName, start, end, options) {
-                return unwrapJSONCallResult(this.shim.getFormattingEditsForRange(fileName, start, end, JSON.stringify(options)));
-            };
-            LanguageServiceShimProxy.prototype.getFormattingEditsForDocument = function (fileName, options) {
-                return unwrapJSONCallResult(this.shim.getFormattingEditsForDocument(fileName, JSON.stringify(options)));
-            };
-            LanguageServiceShimProxy.prototype.getFormattingEditsAfterKeystroke = function (fileName, position, key, options) {
-                return unwrapJSONCallResult(this.shim.getFormattingEditsAfterKeystroke(fileName, position, key, JSON.stringify(options)));
-            };
-            LanguageServiceShimProxy.prototype.getDocCommentTemplateAtPosition = function (fileName, position) {
-                return unwrapJSONCallResult(this.shim.getDocCommentTemplateAtPosition(fileName, position));
-            };
-            LanguageServiceShimProxy.prototype.isValidBraceCompletionAtPosition = function (fileName, position, openingBrace) {
-                return unwrapJSONCallResult(this.shim.isValidBraceCompletionAtPosition(fileName, position, openingBrace));
-            };
-            LanguageServiceShimProxy.prototype.getJsxClosingTagAtPosition = function () {
-                throw new Error("Not supported on the shim.");
-            };
-            LanguageServiceShimProxy.prototype.getSpanOfEnclosingComment = function (fileName, position, onlyMultiLine) {
-                return unwrapJSONCallResult(this.shim.getSpanOfEnclosingComment(fileName, position, onlyMultiLine));
-            };
-            LanguageServiceShimProxy.prototype.getCodeFixesAtPosition = function () {
-                throw new Error("Not supported on the shim.");
-            };
-            LanguageServiceShimProxy.prototype.getCodeFixDiagnostics = function () {
-                throw new Error("Not supported on the shim.");
-            };
-            LanguageServiceShimProxy.prototype.getEditsForRefactor = function () {
-                throw new Error("Not supported on the shim.");
-            };
-            LanguageServiceShimProxy.prototype.getApplicableRefactors = function () {
-                throw new Error("Not supported on the shim.");
-            };
-            LanguageServiceShimProxy.prototype.organizeImports = function (_scope, _formatOptions) {
-                throw new Error("Not supported on the shim.");
-            };
-            LanguageServiceShimProxy.prototype.getEditsForFileRename = function () {
-                throw new Error("Not supported on the shim.");
-            };
-            LanguageServiceShimProxy.prototype.getEmitOutput = function (fileName) {
-                return unwrapJSONCallResult(this.shim.getEmitOutput(fileName));
-            };
-            LanguageServiceShimProxy.prototype.getProgram = function () {
-                throw new Error("Program can not be marshaled across the shim layer.");
-            };
-            LanguageServiceShimProxy.prototype.getNonBoundSourceFile = function () {
-                throw new Error("SourceFile can not be marshaled across the shim layer.");
-            };
-            LanguageServiceShimProxy.prototype.getSourceFile = function () {
-                throw new Error("SourceFile can not be marshaled across the shim layer.");
-            };
-            LanguageServiceShimProxy.prototype.dispose = function () { this.shim.dispose({}); };
-            return LanguageServiceShimProxy;
-        }());
-        var ShimLanguageServiceAdapter = /** @class */ (function () {
-            function ShimLanguageServiceAdapter(preprocessToResolve, cancellationToken, options) {
-                this.host = new ShimLanguageServiceHost(preprocessToResolve, cancellationToken, options);
-                this.factory = new TypeScript.Services.TypeScriptServicesFactory();
-            }
-            ShimLanguageServiceAdapter.prototype.getHost = function () { return this.host; };
-            ShimLanguageServiceAdapter.prototype.getLanguageService = function () { return new LanguageServiceShimProxy(this.factory.createLanguageServiceShim(this.host)); };
-            ShimLanguageServiceAdapter.prototype.getClassifier = function () { return new ClassifierShimProxy(this.factory.createClassifierShim(this.host)); };
-            ShimLanguageServiceAdapter.prototype.getPreProcessedFileInfo = function (fileName, fileContents) {
-                var shimResult;
-                var coreServicesShim = this.factory.createCoreServicesShim(this.host);
-                shimResult = unwrapJSONCallResult(coreServicesShim.getPreProcessedFileInfo(fileName, ts.ScriptSnapshot.fromString(fileContents)));
-                var convertResult = {
-                    referencedFiles: [],
-                    importedFiles: [],
-                    ambientExternalModules: [],
-                    isLibFile: shimResult.isLibFile,
-                    typeReferenceDirectives: [],
-                    libReferenceDirectives: []
-                };
-                ts.forEach(shimResult.referencedFiles, function (refFile) {
-                    convertResult.referencedFiles.push({
-                        fileName: refFile.path,
-                        pos: refFile.position,
-                        end: refFile.position + refFile.length
-                    });
-                });
-                ts.forEach(shimResult.importedFiles, function (importedFile) {
-                    convertResult.importedFiles.push({
-                        fileName: importedFile.path,
-                        pos: importedFile.position,
-                        end: importedFile.position + importedFile.length
-                    });
-                });
-                ts.forEach(shimResult.typeReferenceDirectives, function (typeRefDirective) {
-                    convertResult.importedFiles.push({
-                        fileName: typeRefDirective.path,
-                        pos: typeRefDirective.position,
-                        end: typeRefDirective.position + typeRefDirective.length
-                    });
-                });
-                return convertResult;
-            };
-            return ShimLanguageServiceAdapter;
-        }());
-        LanguageService.ShimLanguageServiceAdapter = ShimLanguageServiceAdapter;
-        // Server adapter
-        var SessionClientHost = /** @class */ (function (_super) {
-            __extends(SessionClientHost, _super);
-            function SessionClientHost(cancellationToken, settings) {
-                var _this = _super.call(this, cancellationToken, settings) || this;
-                _this.onMessage = ts.noop;
-                _this.writeMessage = ts.noop;
-                return _this;
-            }
-            SessionClientHost.prototype.setClient = function (client) {
-                this.client = client;
-            };
-            SessionClientHost.prototype.openFile = function (fileName, content, scriptKindName) {
-                _super.prototype.openFile.call(this, fileName, content, scriptKindName);
-                this.client.openFile(fileName, content, scriptKindName);
-            };
-            SessionClientHost.prototype.editScript = function (fileName, start, end, newText) {
-                _super.prototype.editScript.call(this, fileName, start, end, newText);
-                this.client.changeFile(fileName, start, end, newText);
-            };
-            return SessionClientHost;
-        }(NativeLanguageServiceHost));
-        var SessionServerHost = /** @class */ (function () {
-            function SessionServerHost(host) {
-                this.host = host;
-                this.args = [];
-                this.useCaseSensitiveFileNames = false;
-                this.onMessage = ts.noop;
-                this.writeMessage = ts.noop; // overridden
-                this.writeFile = ts.noop;
-                this.exit = ts.noop;
-                this.close = ts.noop;
-                this.newLine = this.host.getNewLine();
-            }
-            SessionServerHost.prototype.write = function (message) {
-                this.writeMessage(message);
-            };
-            SessionServerHost.prototype.readFile = function (fileName) {
-                if (ts.stringContains(fileName, Harness.Compiler.defaultLibFileName)) {
-                    fileName = Harness.Compiler.defaultLibFileName;
-                }
-                var snapshot = this.host.getScriptSnapshot(fileName);
-                return snapshot && ts.getSnapshotText(snapshot);
-            };
-            SessionServerHost.prototype.resolvePath = function (path) {
-                return path;
-            };
-            SessionServerHost.prototype.fileExists = function (path) {
-                return !!this.host.getScriptSnapshot(path);
-            };
-            SessionServerHost.prototype.directoryExists = function () {
-                // for tests assume that directory exists
-                return true;
-            };
-            SessionServerHost.prototype.getExecutingFilePath = function () {
-                return "";
-            };
-            SessionServerHost.prototype.createDirectory = function (_directoryName) {
-                return ts.notImplemented();
-            };
-            SessionServerHost.prototype.getCurrentDirectory = function () {
-                return this.host.getCurrentDirectory();
-            };
-            SessionServerHost.prototype.getDirectories = function () {
-                return [];
-            };
-            SessionServerHost.prototype.getEnvironmentVariable = function (name) {
-                return ts.sys.getEnvironmentVariable(name);
-            };
-            SessionServerHost.prototype.readDirectory = function () { return ts.notImplemented(); };
-            SessionServerHost.prototype.watchFile = function () {
-                return { close: ts.noop };
-            };
-            SessionServerHost.prototype.watchDirectory = function () {
-                return { close: ts.noop };
-            };
-            SessionServerHost.prototype.info = function (message) {
-                this.host.log(message);
-            };
-            SessionServerHost.prototype.msg = function (message) {
-                this.host.log(message);
-            };
-            SessionServerHost.prototype.loggingEnabled = function () {
-                return true;
-            };
-            SessionServerHost.prototype.getLogFileName = function () {
-                return undefined;
-            };
-            SessionServerHost.prototype.hasLevel = function () {
-                return false;
-            };
-            SessionServerHost.prototype.startGroup = function () { throw ts.notImplemented(); };
-            SessionServerHost.prototype.endGroup = function () { throw ts.notImplemented(); };
-            SessionServerHost.prototype.perftrc = function (message) {
-                return this.host.log(message);
-            };
-            SessionServerHost.prototype.setTimeout = function (callback, ms) {
-                var args = [];
-                for (var _i = 2; _i < arguments.length; _i++) {
-                    args[_i - 2] = arguments[_i];
-                }
-                return setTimeout(callback, ms, args);
-            };
-            SessionServerHost.prototype.clearTimeout = function (timeoutId) {
-                clearTimeout(timeoutId);
-            };
-            SessionServerHost.prototype.setImmediate = function (callback, _ms) {
-                var args = [];
-                for (var _i = 2; _i < arguments.length; _i++) {
-                    args[_i - 2] = arguments[_i];
-                }
-                return setImmediate(callback, args);
-            };
-            SessionServerHost.prototype.clearImmediate = function (timeoutId) {
-                clearImmediate(timeoutId);
-            };
-            SessionServerHost.prototype.createHash = function (s) {
-                return Harness.mockHash(s);
-            };
-            SessionServerHost.prototype.require = function (_initialDir, _moduleName) {
-                switch (_moduleName) {
-                    // Adds to the Quick Info a fixed string and a string from the config file
-                    // and replaces the first display part
-                    case "quickinfo-augmeneter":
-                        return {
-                            module: function () { return ({
-                                create: function (info) {
-                                    var proxy = makeDefaultProxy(info);
-                                    var langSvc = info.languageService;
-                                    // tslint:disable-next-line only-arrow-functions
-                                    proxy.getQuickInfoAtPosition = function () {
-                                        var parts = langSvc.getQuickInfoAtPosition.apply(langSvc, arguments);
-                                        if (parts.displayParts.length > 0) {
-                                            parts.displayParts[0].text = "Proxied";
-                                        }
-                                        parts.displayParts.push({ text: info.config.message, kind: "punctuation" });
-                                        return parts;
-                                    };
-                                    return proxy;
-                                }
-                            }); },
-                            error: undefined
-                        };
-                    // Throws during initialization
-                    case "create-thrower":
-                        return {
-                            module: function () { return ({
-                                create: function () {
-                                    throw new Error("I am not a well-behaved plugin");
-                                }
-                            }); },
-                            error: undefined
-                        };
-                    // Adds another diagnostic
-                    case "diagnostic-adder":
-                        return {
-                            module: function () { return ({
-                                create: function (info) {
-                                    var proxy = makeDefaultProxy(info);
-                                    proxy.getSemanticDiagnostics = function (filename) {
-                                        var prev = info.languageService.getSemanticDiagnostics(filename);
-                                        var sourceFile = info.project.getSourceFile(ts.toPath(filename, /*basePath*/ undefined, ts.createGetCanonicalFileName(info.serverHost.useCaseSensitiveFileNames)));
-                                        prev.push({
-                                            category: ts.DiagnosticCategory.Warning,
-                                            file: sourceFile,
-                                            code: 9999,
-                                            length: 3,
-                                            messageText: "Plugin diagnostic",
-                                            start: 0
-                                        });
-                                        return prev;
-                                    };
-                                    return proxy;
-                                }
-                            }); },
-                            error: undefined
-                        };
-                    default:
-                        return {
-                            module: undefined,
-                            error: new Error("Could not resolve module")
-                        };
-                }
-                function makeDefaultProxy(info) {
-                    // tslint:disable-next-line:no-null-keyword
-                    var proxy = Object.create(/*prototype*/ null);
-                    var langSvc = info.languageService;
-                    var _loop_2 = function (k) {
-                        // tslint:disable-next-line only-arrow-functions
-                        proxy[k] = function () {
-                            return langSvc[k].apply(langSvc, arguments);
-                        };
-                    };
-                    for (var _i = 0, _a = Object.keys(langSvc); _i < _a.length; _i++) {
-                        var k = _a[_i];
-                        _loop_2(k);
-                    }
-                    return proxy;
-                }
-            };
-            return SessionServerHost;
-        }());
-        var ServerLanguageServiceAdapter = /** @class */ (function () {
-            function ServerLanguageServiceAdapter(cancellationToken, options) {
-                // This is the main host that tests use to direct tests
-                var clientHost = new SessionClientHost(cancellationToken, options);
-                var client = new ts.server.SessionClient(clientHost);
-                // This host is just a proxy for the clientHost, it uses the client
-                // host to answer server queries about files on disk
-                var serverHost = new SessionServerHost(clientHost);
-                var opts = {
-                    host: serverHost,
-                    cancellationToken: ts.server.nullCancellationToken,
-                    useSingleInferredProject: false,
-                    useInferredProjectPerProjectRoot: false,
-                    typingsInstaller: undefined,
-                    byteLength: Utils.byteLength,
-                    hrtime: process.hrtime,
-                    logger: serverHost,
-                    canUseEvents: true
-                };
-                var server = new ts.server.Session(opts);
-                // Fake the connection between the client and the server
-                serverHost.writeMessage = client.onMessage.bind(client);
-                clientHost.writeMessage = server.onMessage.bind(server);
-                // Wire the client to the host to get notifications when a file is open
-                // or edited.
-                clientHost.setClient(client);
-                // Set the properties
-                this.client = client;
-                this.host = clientHost;
-            }
-            ServerLanguageServiceAdapter.prototype.getHost = function () { return this.host; };
-            ServerLanguageServiceAdapter.prototype.getLanguageService = function () { return this.client; };
-            ServerLanguageServiceAdapter.prototype.getClassifier = function () { throw new Error("getClassifier is not available using the server interface."); };
-            ServerLanguageServiceAdapter.prototype.getPreProcessedFileInfo = function () { throw new Error("getPreProcessedFileInfo is not available using the server interface."); };
-            return ServerLanguageServiceAdapter;
-        }());
-        LanguageService.ServerLanguageServiceAdapter = ServerLanguageServiceAdapter;
-    })(LanguageService = Harness.LanguageService || (Harness.LanguageService = {}));
-})(Harness || (Harness = {}));
-var ts;
-(function (ts) {
-    var TestFSWithWatch;
-    (function (TestFSWithWatch) {
-        TestFSWithWatch.libFile = {
-            path: "/a/lib/lib.d.ts",
-            content: "/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> {}"
-        };
-        TestFSWithWatch.safeList = {
-            path: "/safeList.json",
-            content: JSON.stringify({
-                commander: "commander",
-                express: "express",
-                jquery: "jquery",
-                lodash: "lodash",
-                moment: "moment",
-                chroma: "chroma-js"
-            })
-        };
-        function getExecutingFilePathFromLibFile() {
-            return ts.combinePaths(ts.getDirectoryPath(TestFSWithWatch.libFile.path), "tsc.js");
-        }
-        function createWatchedSystem(fileOrFolderList, params) {
-            if (!params) {
-                params = {};
-            }
-            var host = new TestServerHost(/*withSafelist*/ false, params.useCaseSensitiveFileNames !== undefined ? params.useCaseSensitiveFileNames : false, params.executingFilePath || getExecutingFilePathFromLibFile(), params.currentDirectory || "/", fileOrFolderList, params.newLine, params.useWindowsStylePaths, params.environmentVariables);
-            return host;
-        }
-        TestFSWithWatch.createWatchedSystem = createWatchedSystem;
-        function createServerHost(fileOrFolderList, params) {
-            if (!params) {
-                params = {};
-            }
-            var host = new TestServerHost(/*withSafelist*/ true, params.useCaseSensitiveFileNames !== undefined ? params.useCaseSensitiveFileNames : false, params.executingFilePath || getExecutingFilePathFromLibFile(), params.currentDirectory || "/", fileOrFolderList, params.newLine, params.useWindowsStylePaths, params.environmentVariables);
-            return host;
-        }
-        TestFSWithWatch.createServerHost = createServerHost;
-        function isFile(fileOrFolderOrSymLink) {
-            return ts.isString(fileOrFolderOrSymLink.content);
-        }
-        function isSymLink(fileOrFolderOrSymLink) {
-            return ts.isString(fileOrFolderOrSymLink.symLink);
-        }
-        function isFsFolder(s) {
-            return s && ts.isArray(s.entries);
-        }
-        function isFsFile(s) {
-            return s && ts.isString(s.content);
-        }
-        function isFsSymLink(s) {
-            return s && ts.isString(s.symLink);
-        }
-        function invokeWatcherCallbacks(callbacks, invokeCallback) {
-            if (callbacks) {
-                // The array copy is made to ensure that even if one of the callback removes the callbacks,
-                // we dont miss any callbacks following it
-                var cbs = callbacks.slice();
-                for (var _i = 0, cbs_1 = cbs; _i < cbs_1.length; _i++) {
-                    var cb = cbs_1[_i];
-                    invokeCallback(cb);
-                }
-            }
-        }
-        function getDiffInKeys(map, expectedKeys) {
-            if (map.size === expectedKeys.length) {
-                return "";
-            }
-            var notInActual = [];
-            var duplicates = [];
-            var seen = ts.createMap();
-            ts.forEach(expectedKeys, function (expectedKey) {
-                if (seen.has(expectedKey)) {
-                    duplicates.push(expectedKey);
-                    return;
-                }
-                seen.set(expectedKey, true);
-                if (!map.has(expectedKey)) {
-                    notInActual.push(expectedKey);
-                }
-            });
-            var inActualNotExpected = [];
-            map.forEach(function (_value, key) {
-                if (!seen.has(key)) {
-                    inActualNotExpected.push(key);
-                }
-                seen.set(key, true);
-            });
-            return "\n\nNotInActual: " + notInActual + "\nDuplicates: " + duplicates + "\nInActualButNotInExpected: " + inActualNotExpected;
-        }
-        function verifyMapSize(caption, map, expectedKeys) {
-            assert.equal(map.size, expectedKeys.length, caption + ": incorrect size of map: Actual keys: " + ts.arrayFrom(map.keys()) + " Expected: " + expectedKeys + getDiffInKeys(map, expectedKeys));
-        }
-        TestFSWithWatch.verifyMapSize = verifyMapSize;
-        function checkMapKeys(caption, map, expectedKeys) {
-            verifyMapSize(caption, map, expectedKeys);
-            for (var _i = 0, expectedKeys_1 = expectedKeys; _i < expectedKeys_1.length; _i++) {
-                var name = expectedKeys_1[_i];
-                assert.isTrue(map.has(name), caption + " is expected to contain " + name + ", actual keys: " + ts.arrayFrom(map.keys()));
-            }
-        }
-        function checkMultiMapKeyCount(caption, actual, expectedKeysMapOrArray, eachKeyCount) {
-            var expectedKeys = ts.isArray(expectedKeysMapOrArray) ? ts.arrayToMap(expectedKeysMapOrArray, function (s) { return s; }, function () { return eachKeyCount; }) : expectedKeysMapOrArray;
-            verifyMapSize(caption, actual, ts.arrayFrom(expectedKeys.keys()));
-            expectedKeys.forEach(function (count, name) {
-                assert.isTrue(actual.has(name), caption + ": expected to contain " + name + ", actual keys: " + ts.arrayFrom(actual.keys()));
-                assert.equal(actual.get(name).length, count, caption + ": Expected to be have " + count + " entries for " + name + ". Actual entry: " + JSON.stringify(actual.get(name)));
-            });
-        }
-        TestFSWithWatch.checkMultiMapKeyCount = checkMultiMapKeyCount;
-        function checkArray(caption, actual, expected) {
-            assert.equal(actual.length, expected.length, caption + ": incorrect actual number of files, expected:\r\n" + expected.join("\r\n") + "\r\ngot: " + actual.join("\r\n"));
-            for (var _i = 0, expected_1 = expected; _i < expected_1.length; _i++) {
-                var f = expected_1[_i];
-                assert.equal(true, ts.contains(actual, f), caption + ": expected to find " + f + " in " + actual);
-            }
-        }
-        TestFSWithWatch.checkArray = checkArray;
-        function checkWatchedFiles(host, expectedFiles) {
-            checkMapKeys("watchedFiles", host.watchedFiles, expectedFiles);
-        }
-        TestFSWithWatch.checkWatchedFiles = checkWatchedFiles;
-        function checkWatchedFilesDetailed(host, expectedFiles, eachFileWatchCount) {
-            if (ts.isArray(expectedFiles)) {
-                checkMultiMapKeyCount("watchedFiles", host.watchedFiles, expectedFiles, eachFileWatchCount);
-            }
-            else {
-                checkMultiMapKeyCount("watchedFiles", host.watchedFiles, expectedFiles);
-            }
-        }
-        TestFSWithWatch.checkWatchedFilesDetailed = checkWatchedFilesDetailed;
-        function checkWatchedDirectories(host, expectedDirectories, recursive) {
-            checkMapKeys("watchedDirectories" + (recursive ? " recursive" : ""), recursive ? host.watchedDirectoriesRecursive : host.watchedDirectories, expectedDirectories);
-        }
-        TestFSWithWatch.checkWatchedDirectories = checkWatchedDirectories;
-        function checkWatchedDirectoriesDetailed(host, expectedDirectories, recursiveOrEachDirectoryWatchCount, recursive) {
-            if (ts.isArray(expectedDirectories)) {
-                checkMultiMapKeyCount("watchedDirectories" + (recursive ? " recursive" : ""), recursive ? host.watchedDirectoriesRecursive : host.watchedDirectories, expectedDirectories, recursiveOrEachDirectoryWatchCount);
-            }
-            else {
-                recursive = recursiveOrEachDirectoryWatchCount;
-                checkMultiMapKeyCount("watchedDirectories" + (recursive ? " recursive" : ""), recursive ? host.watchedDirectoriesRecursive : host.watchedDirectories, expectedDirectories);
-            }
-        }
-        TestFSWithWatch.checkWatchedDirectoriesDetailed = checkWatchedDirectoriesDetailed;
-        function checkOutputContains(host, expected) {
-            var mapExpected = ts.arrayToSet(expected);
-            var mapSeen = ts.createMap();
-            for (var _i = 0, _a = host.getOutput(); _i < _a.length; _i++) {
-                var f = _a[_i];
-                assert.isUndefined(mapSeen.get(f), "Already found " + f + " in " + JSON.stringify(host.getOutput()));
-                if (mapExpected.has(f)) {
-                    mapExpected.delete(f);
-                    mapSeen.set(f, true);
-                }
-            }
-            assert.equal(mapExpected.size, 0, "Output has missing " + JSON.stringify(ts.arrayFrom(mapExpected.keys())) + " in " + JSON.stringify(host.getOutput()));
-        }
-        TestFSWithWatch.checkOutputContains = checkOutputContains;
-        function checkOutputDoesNotContain(host, expectedToBeAbsent) {
-            var mapExpectedToBeAbsent = ts.arrayToSet(expectedToBeAbsent);
-            for (var _i = 0, _a = host.getOutput(); _i < _a.length; _i++) {
-                var f = _a[_i];
-                assert.isFalse(mapExpectedToBeAbsent.has(f), "Contains " + f + " in " + JSON.stringify(host.getOutput()));
-            }
-        }
-        TestFSWithWatch.checkOutputDoesNotContain = checkOutputDoesNotContain;
-        var Callbacks = /** @class */ (function () {
-            function Callbacks() {
-                this.map = [];
-                this.nextId = 1;
-            }
-            Callbacks.prototype.getNextId = function () {
-                return this.nextId;
-            };
-            Callbacks.prototype.register = function (cb, args) {
-                var timeoutId = this.nextId;
-                this.nextId++;
-                this.map[timeoutId] = cb.bind.apply(cb, [/*this*/ undefined].concat(args));
-                return timeoutId;
-            };
-            Callbacks.prototype.unregister = function (id) {
-                if (typeof id === "number") {
-                    delete this.map[id];
-                }
-            };
-            Callbacks.prototype.count = function () {
-                var n = 0;
-                for (var _ in this.map) {
-                    n++;
-                }
-                return n;
-            };
-            Callbacks.prototype.invoke = function (invokeKey) {
-                if (invokeKey) {
-                    this.map[invokeKey]();
-                    delete this.map[invokeKey];
-                    return;
-                }
-                // Note: invoking a callback may result in new callbacks been queued,
-                // so do not clear the entire callback list regardless. Only remove the
-                // ones we have invoked.
-                for (var key in this.map) {
-                    this.map[key]();
-                    delete this.map[key];
-                }
-            };
-            return Callbacks;
-        }());
-        var Tsc_WatchDirectory;
-        (function (Tsc_WatchDirectory) {
-            Tsc_WatchDirectory["WatchFile"] = "RecursiveDirectoryUsingFsWatchFile";
-            Tsc_WatchDirectory["NonRecursiveWatchDirectory"] = "RecursiveDirectoryUsingNonRecursiveWatchDirectory";
-            Tsc_WatchDirectory["DynamicPolling"] = "RecursiveDirectoryUsingDynamicPriorityPolling";
-        })(Tsc_WatchDirectory = TestFSWithWatch.Tsc_WatchDirectory || (TestFSWithWatch.Tsc_WatchDirectory = {}));
-        var timeIncrements = 1000;
-        var TestServerHost = /** @class */ (function () {
-            function TestServerHost(withSafeList, useCaseSensitiveFileNames, executingFilePath, currentDirectory, fileOrFolderorSymLinkList, newLine, useWindowsStylePath, environmentVariables) {
-                if (newLine === void 0) { newLine = "\n"; }
-                var _this = this;
-                this.withSafeList = withSafeList;
-                this.useCaseSensitiveFileNames = useCaseSensitiveFileNames;
-                this.newLine = newLine;
-                this.useWindowsStylePath = useWindowsStylePath;
-                this.environmentVariables = environmentVariables;
-                this.args = [];
-                this.output = [];
-                this.fs = ts.createMap();
-                this.time = timeIncrements;
-                this.timeoutCallbacks = new Callbacks();
-                this.immediateCallbacks = new Callbacks();
-                this.screenClears = [];
-                this.watchedDirectories = ts.createMultiMap();
-                this.watchedDirectoriesRecursive = ts.createMultiMap();
-                this.watchedFiles = ts.createMultiMap();
-                this.exitMessage = "System Exit";
-                this.resolvePath = function (s) { return s; };
-                this.getExecutingFilePath = function () { return _this.executingFilePath; };
-                this.getCurrentDirectory = function () { return _this.currentDirectory; };
-                this.getCanonicalFileName = ts.createGetCanonicalFileName(useCaseSensitiveFileNames);
-                this.toPath = function (s) { return ts.toPath(s, currentDirectory, _this.getCanonicalFileName); };
-                this.executingFilePath = this.getHostSpecificPath(executingFilePath);
-                this.currentDirectory = this.getHostSpecificPath(currentDirectory);
-                this.reloadFS(fileOrFolderorSymLinkList);
-                this.dynamicPriorityWatchFile = this.environmentVariables && this.environmentVariables.get("TSC_WATCHFILE") === "DynamicPriorityPolling" ?
-                    ts.createDynamicPriorityPollingWatchFile(this) :
-                    undefined;
-                var tscWatchDirectory = this.environmentVariables && this.environmentVariables.get("TSC_WATCHDIRECTORY");
-                if (tscWatchDirectory === Tsc_WatchDirectory.WatchFile) {
-                    var watchDirectory = function (directory, cb) { return _this.watchFile(directory, function () { return cb(directory); }, ts.PollingInterval.Medium); };
-                    this.customRecursiveWatchDirectory = ts.createRecursiveDirectoryWatcher({
-                        directoryExists: function (path) { return _this.directoryExists(path); },
-                        getAccessibleSortedChildDirectories: function (path) { return _this.getDirectories(path); },
-                        filePathComparer: this.useCaseSensitiveFileNames ? ts.compareStringsCaseSensitive : ts.compareStringsCaseInsensitive,
-                        watchDirectory: watchDirectory,
-                        realpath: function (s) { return _this.realpath(s); }
-                    });
-                }
-                else if (tscWatchDirectory === Tsc_WatchDirectory.NonRecursiveWatchDirectory) {
-                    var watchDirectory = function (directory, cb) { return _this.watchDirectory(directory, function (fileName) { return cb(fileName); }, /*recursive*/ false); };
-                    this.customRecursiveWatchDirectory = ts.createRecursiveDirectoryWatcher({
-                        directoryExists: function (path) { return _this.directoryExists(path); },
-                        getAccessibleSortedChildDirectories: function (path) { return _this.getDirectories(path); },
-                        filePathComparer: this.useCaseSensitiveFileNames ? ts.compareStringsCaseSensitive : ts.compareStringsCaseInsensitive,
-                        watchDirectory: watchDirectory,
-                        realpath: function (s) { return _this.realpath(s); }
-                    });
-                }
-                else if (tscWatchDirectory === Tsc_WatchDirectory.DynamicPolling) {
-                    var watchFile_1 = ts.createDynamicPriorityPollingWatchFile(this);
-                    var watchDirectory = function (directory, cb) { return watchFile_1(directory, function () { return cb(directory); }, ts.PollingInterval.Medium); };
-                    this.customRecursiveWatchDirectory = ts.createRecursiveDirectoryWatcher({
-                        directoryExists: function (path) { return _this.directoryExists(path); },
-                        getAccessibleSortedChildDirectories: function (path) { return _this.getDirectories(path); },
-                        filePathComparer: this.useCaseSensitiveFileNames ? ts.compareStringsCaseSensitive : ts.compareStringsCaseInsensitive,
-                        watchDirectory: watchDirectory,
-                        realpath: function (s) { return _this.realpath(s); }
-                    });
-                }
-            }
-            TestServerHost.prototype.getNewLine = function () {
-                return this.newLine;
-            };
-            TestServerHost.prototype.toNormalizedAbsolutePath = function (s) {
-                return ts.getNormalizedAbsolutePath(s, this.currentDirectory);
-            };
-            TestServerHost.prototype.toFullPath = function (s) {
-                return this.toPath(this.toNormalizedAbsolutePath(s));
-            };
-            TestServerHost.prototype.getHostSpecificPath = function (s) {
-                if (this.useWindowsStylePath && s.startsWith(ts.directorySeparator)) {
-                    return "c:/" + s.substring(1);
-                }
-                return s;
-            };
-            TestServerHost.prototype.now = function () {
-                this.time += timeIncrements;
-                return new Date(this.time);
-            };
-            TestServerHost.prototype.reloadFS = function (fileOrFolderOrSymLinkList, options) {
-                var _this = this;
-                var mapNewLeaves = ts.createMap();
-                var isNewFs = this.fs.size === 0;
-                fileOrFolderOrSymLinkList = fileOrFolderOrSymLinkList.concat(this.withSafeList ? TestFSWithWatch.safeList : []);
-                var filesOrFoldersToLoad = !this.useWindowsStylePath ? fileOrFolderOrSymLinkList :
-                    fileOrFolderOrSymLinkList.map(function (f) {
-                        var result = ts.clone(f);
-                        result.path = _this.getHostSpecificPath(f.path);
-                        return result;
-                    });
-                for (var _i = 0, filesOrFoldersToLoad_1 = filesOrFoldersToLoad; _i < filesOrFoldersToLoad_1.length; _i++) {
-                    var fileOrDirectory = filesOrFoldersToLoad_1[_i];
-                    var path = this.toFullPath(fileOrDirectory.path);
-                    mapNewLeaves.set(path, true);
-                    // If its a change
-                    var currentEntry = this.fs.get(path);
-                    if (currentEntry) {
-                        if (isFsFile(currentEntry)) {
-                            if (isFile(fileOrDirectory)) {
-                                // Update file
-                                if (currentEntry.content !== fileOrDirectory.content) {
-                                    this.modifyFile(fileOrDirectory.path, fileOrDirectory.content, options);
-                                }
-                            }
-                            else {
-                                // TODO: Changing from file => folder/Symlink
-                            }
-                        }
-                        else if (isFsSymLink(currentEntry)) {
-                            // TODO: update symlinks
-                        }
-                        else {
-                            // Folder
-                            if (isFile(fileOrDirectory)) {
-                                // TODO: Changing from folder => file
-                            }
-                            else {
-                                // Folder update: Nothing to do.
-                                currentEntry.modifiedTime = this.now();
-                            }
-                        }
-                    }
-                    else {
-                        this.ensureFileOrFolder(fileOrDirectory, options && options.ignoreWatchInvokedWithTriggerAsFileCreate);
-                    }
-                }
-                if (!isNewFs) {
-                    this.fs.forEach(function (fileOrDirectory, path) {
-                        // If this entry is not from the new file or folder
-                        if (!mapNewLeaves.get(path)) {
-                            // Leaf entries that arent in new list => remove these
-                            if (isFsFile(fileOrDirectory) || isFsSymLink(fileOrDirectory) || isFsFolder(fileOrDirectory) && fileOrDirectory.entries.length === 0) {
-                                _this.removeFileOrFolder(fileOrDirectory, function (folder) { return !mapNewLeaves.get(folder.path); });
-                            }
-                        }
-                    });
-                }
-            };
-            TestServerHost.prototype.modifyFile = function (filePath, content, options) {
-                var path = this.toFullPath(filePath);
-                var currentEntry = this.fs.get(path);
-                if (!currentEntry || !isFsFile(currentEntry)) {
-                    throw new Error("file not present: " + filePath);
-                }
-                if (options && options.invokeFileDeleteCreateAsPartInsteadOfChange) {
-                    this.removeFileOrFolder(currentEntry, ts.returnFalse);
-                    this.ensureFileOrFolder({ path: filePath, content: content });
-                }
-                else {
-                    currentEntry.content = content;
-                    currentEntry.modifiedTime = this.now();
-                    this.fs.get(ts.getDirectoryPath(currentEntry.path)).modifiedTime = this.now();
-                    if (options && options.invokeDirectoryWatcherInsteadOfFileChanged) {
-                        this.invokeDirectoryWatcher(ts.getDirectoryPath(currentEntry.fullPath), currentEntry.fullPath);
-                    }
-                    else {
-                        this.invokeFileWatcher(currentEntry.fullPath, ts.FileWatcherEventKind.Changed);
-                    }
-                }
-            };
-            TestServerHost.prototype.renameFolder = function (folderName, newFolderName) {
-                var fullPath = ts.getNormalizedAbsolutePath(folderName, this.currentDirectory);
-                var path = this.toPath(fullPath);
-                var folder = this.fs.get(path);
-                ts.Debug.assert(!!folder);
-                // Only remove the folder
-                this.removeFileOrFolder(folder, ts.returnFalse, /*isRenaming*/ true);
-                // Add updated folder with new folder name
-                var newFullPath = ts.getNormalizedAbsolutePath(newFolderName, this.currentDirectory);
-                var newFolder = this.toFsFolder(newFullPath);
-                var newPath = newFolder.path;
-                var basePath = ts.getDirectoryPath(path);
-                ts.Debug.assert(basePath !== path);
-                ts.Debug.assert(basePath === ts.getDirectoryPath(newPath));
-                var baseFolder = this.fs.get(basePath);
-                this.addFileOrFolderInFolder(baseFolder, newFolder);
-                // Invoke watches for files in the folder as deleted (from old path)
-                this.renameFolderEntries(folder, newFolder);
-            };
-            TestServerHost.prototype.renameFolderEntries = function (oldFolder, newFolder) {
-                for (var _i = 0, _a = oldFolder.entries; _i < _a.length; _i++) {
-                    var entry = _a[_i];
-                    this.fs.delete(entry.path);
-                    this.invokeFileWatcher(entry.fullPath, ts.FileWatcherEventKind.Deleted);
-                    entry.fullPath = ts.combinePaths(newFolder.fullPath, ts.getBaseFileName(entry.fullPath));
-                    entry.path = this.toPath(entry.fullPath);
-                    if (newFolder !== oldFolder) {
-                        newFolder.entries.push(entry);
-                    }
-                    this.fs.set(entry.path, entry);
-                    this.invokeFileWatcher(entry.fullPath, ts.FileWatcherEventKind.Created);
-                    if (isFsFolder(entry)) {
-                        this.renameFolderEntries(entry, entry);
-                    }
-                }
-            };
-            TestServerHost.prototype.ensureFileOrFolder = function (fileOrDirectoryOrSymLink, ignoreWatchInvokedWithTriggerAsFileCreate) {
-                if (isFile(fileOrDirectoryOrSymLink)) {
-                    var file = this.toFsFile(fileOrDirectoryOrSymLink);
-                    // file may already exist when updating existing type declaration file
-                    if (!this.fs.get(file.path)) {
-                        var baseFolder = this.ensureFolder(ts.getDirectoryPath(file.fullPath));
-                        this.addFileOrFolderInFolder(baseFolder, file, ignoreWatchInvokedWithTriggerAsFileCreate);
-                    }
-                }
-                else if (isSymLink(fileOrDirectoryOrSymLink)) {
-                    var symLink = this.toFsSymLink(fileOrDirectoryOrSymLink);
-                    ts.Debug.assert(!this.fs.get(symLink.path));
-                    var baseFolder = this.ensureFolder(ts.getDirectoryPath(symLink.fullPath));
-                    this.addFileOrFolderInFolder(baseFolder, symLink, ignoreWatchInvokedWithTriggerAsFileCreate);
-                }
-                else {
-                    var fullPath = ts.getNormalizedAbsolutePath(fileOrDirectoryOrSymLink.path, this.currentDirectory);
-                    this.ensureFolder(fullPath);
-                }
-            };
-            TestServerHost.prototype.ensureFolder = function (fullPath) {
-                var path = this.toPath(fullPath);
-                var folder = this.fs.get(path);
-                if (!folder) {
-                    folder = this.toFsFolder(fullPath);
-                    var baseFullPath = ts.getDirectoryPath(fullPath);
-                    if (fullPath !== baseFullPath) {
-                        // Add folder in the base folder
-                        var baseFolder = this.ensureFolder(baseFullPath);
-                        this.addFileOrFolderInFolder(baseFolder, folder);
-                    }
-                    else {
-                        // root folder
-                        ts.Debug.assert(this.fs.size === 0);
-                        this.fs.set(path, folder);
-                    }
-                }
-                ts.Debug.assert(isFsFolder(folder));
-                return folder;
-            };
-            TestServerHost.prototype.addFileOrFolderInFolder = function (folder, fileOrDirectory, ignoreWatch) {
-                ts.insertSorted(folder.entries, fileOrDirectory, function (a, b) { return ts.compareStringsCaseSensitive(ts.getBaseFileName(a.path), ts.getBaseFileName(b.path)); });
-                folder.modifiedTime = this.now();
-                this.fs.set(fileOrDirectory.path, fileOrDirectory);
-                if (ignoreWatch) {
-                    return;
-                }
-                this.invokeFileWatcher(fileOrDirectory.fullPath, ts.FileWatcherEventKind.Created);
-                this.invokeDirectoryWatcher(folder.fullPath, fileOrDirectory.fullPath);
-            };
-            TestServerHost.prototype.removeFileOrFolder = function (fileOrDirectory, isRemovableLeafFolder, isRenaming) {
-                if (isRenaming === void 0) { isRenaming = false; }
-                var basePath = ts.getDirectoryPath(fileOrDirectory.path);
-                var baseFolder = this.fs.get(basePath);
-                if (basePath !== fileOrDirectory.path) {
-                    ts.Debug.assert(!!baseFolder);
-                    baseFolder.modifiedTime = this.now();
-                    ts.filterMutate(baseFolder.entries, function (entry) { return entry !== fileOrDirectory; });
-                }
-                this.fs.delete(fileOrDirectory.path);
-                this.invokeFileWatcher(fileOrDirectory.fullPath, ts.FileWatcherEventKind.Deleted);
-                if (isFsFolder(fileOrDirectory)) {
-                    ts.Debug.assert(fileOrDirectory.entries.length === 0 || isRenaming);
-                    var relativePath = this.getRelativePathToDirectory(fileOrDirectory.fullPath, fileOrDirectory.fullPath);
-                    // Invoke directory and recursive directory watcher for the folder
-                    // Here we arent invoking recursive directory watchers for the base folders
-                    // since that is something we would want to do for both file as well as folder we are deleting
-                    this.invokeWatchedDirectoriesCallback(fileOrDirectory.fullPath, relativePath);
-                    this.invokeWatchedDirectoriesRecursiveCallback(fileOrDirectory.fullPath, relativePath);
-                }
-                if (basePath !== fileOrDirectory.path) {
-                    if (baseFolder.entries.length === 0 && isRemovableLeafFolder(baseFolder)) {
-                        this.removeFileOrFolder(baseFolder, isRemovableLeafFolder);
-                    }
-                    else {
-                        this.invokeRecursiveDirectoryWatcher(baseFolder.fullPath, fileOrDirectory.fullPath);
-                    }
-                }
-            };
-            TestServerHost.prototype.removeFolder = function (folderPath, recursive) {
-                var _this = this;
-                var path = this.toFullPath(folderPath);
-                var currentEntry = this.fs.get(path);
-                ts.Debug.assert(isFsFolder(currentEntry));
-                if (recursive && currentEntry.entries.length) {
-                    var subEntries = currentEntry.entries.slice();
-                    subEntries.forEach(function (fsEntry) {
-                        if (isFsFolder(fsEntry)) {
-                            _this.removeFolder(fsEntry.fullPath, recursive);
-                        }
-                        else {
-                            _this.removeFileOrFolder(fsEntry, ts.returnFalse);
-                        }
-                    });
-                }
-                this.removeFileOrFolder(currentEntry, ts.returnFalse);
-            };
-            // For overriding the methods
-            TestServerHost.prototype.invokeWatchedDirectoriesCallback = function (folderFullPath, relativePath) {
-                var _this = this;
-                invokeWatcherCallbacks(this.watchedDirectories.get(this.toPath(folderFullPath)), function (cb) { return _this.directoryCallback(cb, relativePath); });
-            };
-            TestServerHost.prototype.invokeWatchedDirectoriesRecursiveCallback = function (folderFullPath, relativePath) {
-                var _this = this;
-                invokeWatcherCallbacks(this.watchedDirectoriesRecursive.get(this.toPath(folderFullPath)), function (cb) { return _this.directoryCallback(cb, relativePath); });
-            };
-            TestServerHost.prototype.invokeFileWatcher = function (fileFullPath, eventKind, useFileNameInCallback) {
-                invokeWatcherCallbacks(this.watchedFiles.get(this.toPath(fileFullPath)), function (_a) {
-                    var cb = _a.cb, fileName = _a.fileName;
-                    return cb(useFileNameInCallback ? fileName : fileFullPath, eventKind);
-                });
-            };
-            TestServerHost.prototype.getRelativePathToDirectory = function (directoryFullPath, fileFullPath) {
-                return ts.getRelativePathToDirectoryOrUrl(directoryFullPath, fileFullPath, this.currentDirectory, this.getCanonicalFileName, /*isAbsolutePathAnUrl*/ false);
-            };
-            /**
-             * This will call the directory watcher for the folderFullPath and recursive directory watchers for this and base folders
-             */
-            TestServerHost.prototype.invokeDirectoryWatcher = function (folderFullPath, fileName) {
-                var relativePath = this.getRelativePathToDirectory(folderFullPath, fileName);
-                // Folder is changed when the directory watcher is invoked
-                this.invokeFileWatcher(folderFullPath, ts.FileWatcherEventKind.Changed, /*useFileNameInCallback*/ true);
-                this.invokeWatchedDirectoriesCallback(folderFullPath, relativePath);
-                this.invokeRecursiveDirectoryWatcher(folderFullPath, fileName);
-            };
-            TestServerHost.prototype.directoryCallback = function (_a, relativePath) {
-                var cb = _a.cb, directoryName = _a.directoryName;
-                cb(ts.combinePaths(directoryName, relativePath));
-            };
-            /**
-             * This will call the recursive directory watcher for this directory as well as all the base directories
-             */
-            TestServerHost.prototype.invokeRecursiveDirectoryWatcher = function (fullPath, fileName) {
-                var relativePath = this.getRelativePathToDirectory(fullPath, fileName);
-                this.invokeWatchedDirectoriesRecursiveCallback(fullPath, relativePath);
-                var basePath = ts.getDirectoryPath(fullPath);
-                if (this.getCanonicalFileName(fullPath) !== this.getCanonicalFileName(basePath)) {
-                    this.invokeRecursiveDirectoryWatcher(basePath, fileName);
-                }
-            };
-            TestServerHost.prototype.toFsEntry = function (path) {
-                var fullPath = ts.getNormalizedAbsolutePath(path, this.currentDirectory);
-                return {
-                    path: this.toPath(fullPath),
-                    fullPath: fullPath,
-                    modifiedTime: this.now()
-                };
-            };
-            TestServerHost.prototype.toFsFile = function (file) {
-                var fsFile = this.toFsEntry(file.path);
-                fsFile.content = file.content;
-                fsFile.fileSize = file.fileSize;
-                return fsFile;
-            };
-            TestServerHost.prototype.toFsSymLink = function (symLink) {
-                var fsSymLink = this.toFsEntry(symLink.path);
-                fsSymLink.symLink = ts.getNormalizedAbsolutePath(symLink.symLink, ts.getDirectoryPath(fsSymLink.fullPath));
-                return fsSymLink;
-            };
-            TestServerHost.prototype.toFsFolder = function (path) {
-                var fsFolder = this.toFsEntry(path);
-                fsFolder.entries = []; // https://github.com/Microsoft/TypeScript/issues/19873
-                return fsFolder;
-            };
-            TestServerHost.prototype.getRealFsEntry = function (isFsEntry, path, fsEntry) {
-                if (fsEntry === void 0) { fsEntry = this.fs.get(path); }
-                if (isFsEntry(fsEntry)) {
-                    return fsEntry;
-                }
-                if (isFsSymLink(fsEntry)) {
-                    return this.getRealFsEntry(isFsEntry, this.toPath(fsEntry.symLink));
-                }
-                if (fsEntry) {
-                    // This fs entry is something else
-                    return undefined;
-                }
-                var realpath = this.realpath(path);
-                if (path !== realpath) {
-                    return this.getRealFsEntry(isFsEntry, this.toPath(realpath));
-                }
-                return undefined;
-            };
-            TestServerHost.prototype.isFsFile = function (fsEntry) {
-                return !!this.getRealFile(fsEntry.path, fsEntry);
-            };
-            TestServerHost.prototype.getRealFile = function (path, fsEntry) {
-                return this.getRealFsEntry(isFsFile, path, fsEntry);
-            };
-            TestServerHost.prototype.isFsFolder = function (fsEntry) {
-                return !!this.getRealFolder(fsEntry.path, fsEntry);
-            };
-            TestServerHost.prototype.getRealFolder = function (path, fsEntry) {
-                if (fsEntry === void 0) { fsEntry = this.fs.get(path); }
-                return this.getRealFsEntry(isFsFolder, path, fsEntry);
-            };
-            TestServerHost.prototype.fileExists = function (s) {
-                var path = this.toFullPath(s);
-                return !!this.getRealFile(path);
-            };
-            TestServerHost.prototype.getModifiedTime = function (s) {
-                var path = this.toFullPath(s);
-                var fsEntry = this.fs.get(path);
-                return (fsEntry && fsEntry.modifiedTime); // TODO: GH#18217
-            };
-            TestServerHost.prototype.readFile = function (s) {
-                var fsEntry = this.getRealFile(this.toFullPath(s));
-                return fsEntry ? fsEntry.content : undefined;
-            };
-            TestServerHost.prototype.getFileSize = function (s) {
-                var path = this.toFullPath(s);
-                var entry = this.fs.get(path);
-                if (isFsFile(entry)) {
-                    return entry.fileSize ? entry.fileSize : entry.content.length;
-                }
-                return undefined; // TODO: GH#18217
-            };
-            TestServerHost.prototype.directoryExists = function (s) {
-                var path = this.toFullPath(s);
-                return !!this.getRealFolder(path);
-            };
-            TestServerHost.prototype.getDirectories = function (s) {
-                var _this = this;
-                var path = this.toFullPath(s);
-                var folder = this.getRealFolder(path);
-                if (folder) {
-                    return ts.mapDefined(folder.entries, function (entry) { return _this.isFsFolder(entry) ? ts.getBaseFileName(entry.fullPath) : undefined; });
-                }
-                ts.Debug.fail(folder ? "getDirectories called on file" : "getDirectories called on missing folder");
-                return [];
-            };
-            TestServerHost.prototype.readDirectory = function (path, extensions, exclude, include, depth) {
-                var _this = this;
-                return ts.matchFiles(path, extensions, exclude, include, this.useCaseSensitiveFileNames, this.getCurrentDirectory(), depth, function (dir) {
-                    var directories = [];
-                    var files = [];
-                    var folder = _this.getRealFolder(_this.toPath(dir));
-                    if (folder) {
-                        folder.entries.forEach(function (entry) {
-                            if (_this.isFsFolder(entry)) {
-                                directories.push(ts.getBaseFileName(entry.fullPath));
-                            }
-                            else if (_this.isFsFile(entry)) {
-                                files.push(ts.getBaseFileName(entry.fullPath));
-                            }
-                            else {
-                                ts.Debug.fail("Unknown entry");
-                            }
-                        });
-                    }
-                    return { directories: directories, files: files };
-                });
-            };
-            TestServerHost.prototype.watchDirectory = function (directoryName, cb, recursive) {
-                if (recursive && this.customRecursiveWatchDirectory) {
-                    return this.customRecursiveWatchDirectory(directoryName, cb, /*recursive*/ true);
-                }
-                var path = this.toFullPath(directoryName);
-                var map = recursive ? this.watchedDirectoriesRecursive : this.watchedDirectories;
-                var callback = {
-                    cb: cb,
-                    directoryName: directoryName
-                };
-                map.add(path, callback);
-                return {
-                    close: function () { return map.remove(path, callback); }
-                };
-            };
-            TestServerHost.prototype.createHash = function (s) {
-                return Harness.mockHash(s);
-            };
-            TestServerHost.prototype.createSHA256Hash = function (s) {
-                return ts.sys.createSHA256Hash(s);
-            };
-            TestServerHost.prototype.watchFile = function (fileName, cb, pollingInterval) {
-                var _this = this;
-                if (this.dynamicPriorityWatchFile) {
-                    return this.dynamicPriorityWatchFile(fileName, cb, pollingInterval);
-                }
-                var path = this.toFullPath(fileName);
-                var callback = { fileName: fileName, cb: cb };
-                this.watchedFiles.add(path, callback);
-                return { close: function () { return _this.watchedFiles.remove(path, callback); } };
-            };
-            // TOOD: record and invoke callbacks to simulate timer events
-            TestServerHost.prototype.setTimeout = function (callback, _time) {
-                var args = [];
-                for (var _i = 2; _i < arguments.length; _i++) {
-                    args[_i - 2] = arguments[_i];
-                }
-                return this.timeoutCallbacks.register(callback, args);
-            };
-            TestServerHost.prototype.getNextTimeoutId = function () {
-                return this.timeoutCallbacks.getNextId();
-            };
-            TestServerHost.prototype.clearTimeout = function (timeoutId) {
-                this.timeoutCallbacks.unregister(timeoutId);
-            };
-            TestServerHost.prototype.clearScreen = function () {
-                this.screenClears.push(this.output.length);
-            };
-            TestServerHost.prototype.checkTimeoutQueueLengthAndRun = function (expected) {
-                this.checkTimeoutQueueLength(expected);
-                this.runQueuedTimeoutCallbacks();
-            };
-            TestServerHost.prototype.checkTimeoutQueueLength = function (expected) {
-                var callbacksCount = this.timeoutCallbacks.count();
-                assert.equal(callbacksCount, expected, "expected " + expected + " timeout callbacks queued but found " + callbacksCount + ".");
-            };
-            TestServerHost.prototype.runQueuedTimeoutCallbacks = function (timeoutId) {
-                try {
-                    this.timeoutCallbacks.invoke(timeoutId);
-                }
-                catch (e) {
-                    if (e.message === this.exitMessage) {
-                        return;
-                    }
-                    throw e;
-                }
-            };
-            TestServerHost.prototype.runQueuedImmediateCallbacks = function (checkCount) {
-                if (checkCount !== undefined) {
-                    assert.equal(this.immediateCallbacks.count(), checkCount);
-                }
-                this.immediateCallbacks.invoke();
-            };
-            TestServerHost.prototype.setImmediate = function (callback, _time) {
-                var args = [];
-                for (var _i = 2; _i < arguments.length; _i++) {
-                    args[_i - 2] = arguments[_i];
-                }
-                return this.immediateCallbacks.register(callback, args);
-            };
-            TestServerHost.prototype.clearImmediate = function (timeoutId) {
-                this.immediateCallbacks.unregister(timeoutId);
-            };
-            TestServerHost.prototype.createDirectory = function (directoryName) {
-                var folder = this.toFsFolder(directoryName);
-                // base folder has to be present
-                var base = ts.getDirectoryPath(folder.path);
-                var baseFolder = this.fs.get(base);
-                ts.Debug.assert(isFsFolder(baseFolder));
-                ts.Debug.assert(!this.fs.get(folder.path));
-                this.addFileOrFolderInFolder(baseFolder, folder);
-            };
-            TestServerHost.prototype.writeFile = function (path, content) {
-                var file = this.toFsFile({ path: path, content: content });
-                // base folder has to be present
-                var base = ts.getDirectoryPath(file.path);
-                var folder = this.fs.get(base);
-                ts.Debug.assert(isFsFolder(folder));
-                this.addFileOrFolderInFolder(folder, file);
-            };
-            TestServerHost.prototype.write = function (message) {
-                this.output.push(message);
-            };
-            TestServerHost.prototype.getOutput = function () {
-                return this.output;
-            };
-            TestServerHost.prototype.clearOutput = function () {
-                ts.clear(this.output);
-                this.screenClears.length = 0;
-            };
-            TestServerHost.prototype.realpath = function (s) {
-                var fullPath = this.toNormalizedAbsolutePath(s);
-                var path = this.toPath(fullPath);
-                if (ts.getDirectoryPath(path) === path) {
-                    // Root
-                    return s;
-                }
-                var dirFullPath = this.realpath(ts.getDirectoryPath(fullPath));
-                var realFullPath = ts.combinePaths(dirFullPath, ts.getBaseFileName(fullPath));
-                var fsEntry = this.fs.get(this.toPath(realFullPath));
-                if (isFsSymLink(fsEntry)) {
-                    return this.realpath(fsEntry.symLink);
-                }
-                return realFullPath;
-            };
-            TestServerHost.prototype.exit = function (exitCode) {
-                this.exitCode = exitCode;
-                throw new Error(this.exitMessage);
-            };
-            TestServerHost.prototype.getEnvironmentVariable = function (name) {
-                return this.environmentVariables && this.environmentVariables.get(name) || "";
-            };
-            return TestServerHost;
-        }());
-        TestFSWithWatch.TestServerHost = TestServerHost;
-    })(TestFSWithWatch = ts.TestFSWithWatch || (ts.TestFSWithWatch = {}));
-})(ts || (ts = {}));
-var FourSlash;
-(function (FourSlash) {
-    ts.disableIncrementalParsing = false;
-    var FourSlashTestType;
-    (function (FourSlashTestType) {
-        FourSlashTestType[FourSlashTestType["Native"] = 0] = "Native";
-        FourSlashTestType[FourSlashTestType["Shims"] = 1] = "Shims";
-        FourSlashTestType[FourSlashTestType["ShimsWithPreprocess"] = 2] = "ShimsWithPreprocess";
-        FourSlashTestType[FourSlashTestType["Server"] = 3] = "Server";
-    })(FourSlashTestType = FourSlash.FourSlashTestType || (FourSlash.FourSlashTestType = {}));
-    // Name of testcase metadata including ts.CompilerOptions properties that will be used by globalOptions
-    // To add additional option, add property into the testOptMetadataNames, refer the property in either globalMetadataNames or fileMetadataNames
-    // Add cases into convertGlobalOptionsToCompilationsSettings function for the compiler to acknowledge such option from meta data
-    var MetadataOptionNames;
-    (function (MetadataOptionNames) {
-        MetadataOptionNames["baselineFile"] = "BaselineFile";
-        MetadataOptionNames["emitThisFile"] = "emitThisFile";
-        MetadataOptionNames["fileName"] = "Filename";
-        MetadataOptionNames["resolveReference"] = "ResolveReference";
-        MetadataOptionNames["symlink"] = "Symlink";
-    })(MetadataOptionNames || (MetadataOptionNames = {}));
-    // List of allowed metadata names
-    var fileMetadataNames = ["Filename" /* fileName */, "emitThisFile" /* emitThisFile */, "ResolveReference" /* resolveReference */, "Symlink" /* symlink */];
-    function convertGlobalOptionsToCompilerOptions(globalOptions) {
-        var settings = { target: 1 /* ES5 */ };
-        Harness.Compiler.setCompilerOptionsFromHarnessSetting(globalOptions, settings);
-        return settings;
-    }
-    var TestCancellationToken = /** @class */ (function () {
-        function TestCancellationToken() {
-            this.numberOfCallsBeforeCancellation = TestCancellationToken.notCanceled;
-        }
-        TestCancellationToken.prototype.isCancellationRequested = function () {
-            if (this.numberOfCallsBeforeCancellation < 0) {
-                return false;
-            }
-            if (this.numberOfCallsBeforeCancellation > 0) {
-                this.numberOfCallsBeforeCancellation--;
-                return false;
-            }
-            return true;
-        };
-        TestCancellationToken.prototype.setCancelled = function (numberOfCalls) {
-            if (numberOfCalls === void 0) { numberOfCalls = 0; }
-            ts.Debug.assert(numberOfCalls >= 0);
-            this.numberOfCallsBeforeCancellation = numberOfCalls;
-        };
-        TestCancellationToken.prototype.resetCancelled = function () {
-            this.numberOfCallsBeforeCancellation = TestCancellationToken.notCanceled;
-        };
-        // 0 - cancelled
-        // >0 - not cancelled
-        // <0 - not cancelled and value denotes number of isCancellationRequested after which token become cancelled
-        TestCancellationToken.notCanceled = -1;
-        return TestCancellationToken;
-    }());
-    FourSlash.TestCancellationToken = TestCancellationToken;
-    function verifyOperationIsCancelled(f) {
-        try {
-            f();
-        }
-        catch (e) {
-            if (e instanceof ts.OperationCanceledException) {
-                return;
-            }
-        }
-        throw new Error("Operation should be cancelled");
-    }
-    FourSlash.verifyOperationIsCancelled = verifyOperationIsCancelled;
-    // This function creates IScriptSnapshot object for testing getPreProcessedFileInfo
-    // Return object may lack some functionalities for other purposes.
-    function createScriptSnapShot(sourceText) {
-        return ts.ScriptSnapshot.fromString(sourceText);
-    }
-    var TestState = /** @class */ (function () {
-        function TestState(basePath, testType, testData) {
-            var _a;
-            var _this = this;
-            this.basePath = basePath;
-            this.testType = testType;
-            this.testData = testData;
-            // The current caret position in the active file
-            this.currentCaretPosition = 0;
-            // The position of the end of the current selection, or -1 if nothing is selected
-            this.selectionEnd = -1;
-            this.lastKnownMarker = "";
-            // Whether or not we should format on keystrokes
-            this.enableFormatting = true;
-            this.inputFiles = ts.createMap(); // Map between inputFile's fileName and its content for easily looking up when resolving references
-            this.alignmentForExtraInfo = 50;
-            // Create a new Services Adapter
-            this.cancellationToken = new TestCancellationToken();
-            var compilationOptions = convertGlobalOptionsToCompilerOptions(this.testData.globalOptions);
-            compilationOptions.skipDefaultLibCheck = true;
-            // Initialize the language service with all the scripts
-            var startResolveFileRef;
-            var configFileName;
-            for (var _i = 0, _b = testData.files; _i < _b.length; _i++) {
-                var file = _b[_i];
-                // Create map between fileName and its content for easily looking up when resolveReference flag is specified
-                this.inputFiles.set(file.fileName, file.content);
-                if (isConfig(file)) {
-                    var configJson = ts.parseConfigFileTextToJson(file.fileName, file.content);
-                    if (configJson.config === undefined) {
-                        throw new Error("Failed to parse test " + file.fileName + ": " + configJson.error.messageText);
-                    }
-                    // Extend our existing compiler options so that we can also support tsconfig only options
-                    if (configJson.config.compilerOptions) {
-                        var baseDirectory = ts.normalizePath(ts.getDirectoryPath(file.fileName));
-                        var tsConfig = ts.convertCompilerOptionsFromJson(configJson.config.compilerOptions, baseDirectory, file.fileName);
-                        if (!tsConfig.errors || !tsConfig.errors.length) {
-                            compilationOptions = ts.extend(compilationOptions, tsConfig.options);
-                        }
-                    }
-                    configFileName = file.fileName;
-                }
-                if (!startResolveFileRef && file.fileOptions["ResolveReference" /* resolveReference */] === "true") {
-                    startResolveFileRef = file;
-                }
-                else if (startResolveFileRef) {
-                    // If entry point for resolving file references is already specified, report duplication error
-                    throw new Error("There exists a Fourslash file which has resolveReference flag specified; remove duplicated resolveReference flag");
-                }
-            }
-            if (configFileName) {
-                var baseDir = ts.normalizePath(ts.getDirectoryPath(configFileName));
-                var files_2 = (_a = {}, _a[baseDir] = {}, _a);
-                this.inputFiles.forEach(function (data, path) {
-                    var scriptInfo = new Harness.LanguageService.ScriptInfo(path, undefined, /*isRootFile*/ false); // TODO: GH#18217
-                    files_2[path] = new vfs.File(data, { meta: { scriptInfo: scriptInfo } });
-                });
-                var fs = new vfs.FileSystem(/*ignoreCase*/ true, { cwd: baseDir, files: files_2 });
-                var host = new fakes.ParseConfigHost(fs);
-                var jsonSourceFile = ts.parseJsonText(configFileName, this.inputFiles.get(configFileName));
-                compilationOptions = ts.parseJsonSourceFileConfigFileContent(jsonSourceFile, host, baseDir, compilationOptions, configFileName).options;
-            }
-            if (compilationOptions.typeRoots) {
-                compilationOptions.typeRoots = compilationOptions.typeRoots.map(function (p) { return ts.getNormalizedAbsolutePath(p, _this.basePath); });
-            }
-            var languageServiceAdapter = this.getLanguageServiceAdapter(testType, this.cancellationToken, compilationOptions);
-            this.languageServiceAdapterHost = languageServiceAdapter.getHost();
-            this.languageService = memoWrap(languageServiceAdapter.getLanguageService(), this); // Wrap the LS to cache some expensive operations certain tests call repeatedly
-            if (startResolveFileRef) {
-                // Add the entry-point file itself into the languageServiceShimHost
-                this.languageServiceAdapterHost.addScript(startResolveFileRef.fileName, startResolveFileRef.content, /*isRootFile*/ true);
-                var resolvedResult = languageServiceAdapter.getPreProcessedFileInfo(startResolveFileRef.fileName, startResolveFileRef.content);
-                var referencedFiles = resolvedResult.referencedFiles;
-                var importedFiles = resolvedResult.importedFiles;
-                // Add triple reference files into language-service host
-                ts.forEach(referencedFiles, function (referenceFile) {
-                    // Fourslash insert tests/cases/fourslash into inputFile.unitName so we will properly append the same base directory to refFile path
-                    var referenceFilePath = _this.basePath + "/" + referenceFile.fileName;
-                    _this.addMatchedInputFile(referenceFilePath, /* extensions */ undefined);
-                });
-                // Add import files into language-service host
-                ts.forEach(importedFiles, function (importedFile) {
-                    // Fourslash insert tests/cases/fourslash into inputFile.unitName and import statement doesn't require ".ts"
-                    // so convert them before making appropriate comparison
-                    var importedFilePath = _this.basePath + "/" + importedFile.fileName;
-                    _this.addMatchedInputFile(importedFilePath, ts.getSupportedExtensions(compilationOptions));
-                });
-                // Check if no-default-lib flag is false and if so add default library
-                if (!resolvedResult.isLibFile) {
-                    this.languageServiceAdapterHost.addScript(Harness.Compiler.defaultLibFileName, Harness.Compiler.getDefaultLibrarySourceFile().text, /*isRootFile*/ false);
-                }
-            }
-            else {
-                // resolveReference file-option is not specified then do not resolve any files and include all inputFiles
-                this.inputFiles.forEach(function (file, fileName) {
-                    if (!Harness.isDefaultLibraryFile(fileName)) {
-                        _this.languageServiceAdapterHost.addScript(fileName, file, /*isRootFile*/ true);
-                    }
-                });
-                if (!compilationOptions.noLib) {
-                    this.languageServiceAdapterHost.addScript(Harness.Compiler.defaultLibFileName, Harness.Compiler.getDefaultLibrarySourceFile().text, /*isRootFile*/ false);
-                }
-            }
-            var _loop_3 = function (file) {
-                ts.forEach(file.symlinks, function (link) {
-                    _this.languageServiceAdapterHost.vfs.mkdirpSync(vpath.dirname(link));
-                    _this.languageServiceAdapterHost.vfs.symlinkSync(file.fileName, link);
-                });
-            };
-            for (var _c = 0, _d = testData.files; _c < _d.length; _c++) {
-                var file = _d[_c];
-                _loop_3(file);
-            }
-            this.formatCodeSettings = {
-                baseIndentSize: 0,
-                indentSize: 4,
-                tabSize: 4,
-                newLineCharacter: "\n",
-                convertTabsToSpaces: true,
-                indentStyle: ts.IndentStyle.Smart,
-                insertSpaceAfterCommaDelimiter: true,
-                insertSpaceAfterSemicolonInForStatements: true,
-                insertSpaceBeforeAndAfterBinaryOperators: true,
-                insertSpaceAfterConstructor: false,
-                insertSpaceAfterKeywordsInControlFlowStatements: true,
-                insertSpaceAfterFunctionKeywordForAnonymousFunctions: false,
-                insertSpaceAfterOpeningAndBeforeClosingNonemptyParenthesis: false,
-                insertSpaceAfterOpeningAndBeforeClosingNonemptyBrackets: false,
-                insertSpaceAfterOpeningAndBeforeClosingNonemptyBraces: true,
-                insertSpaceAfterOpeningAndBeforeClosingTemplateStringBraces: false,
-                insertSpaceAfterOpeningAndBeforeClosingJsxExpressionBraces: false,
-                insertSpaceAfterTypeAssertion: false,
-                placeOpenBraceOnNewLineForFunctions: false,
-                placeOpenBraceOnNewLineForControlBlocks: false,
-                insertSpaceBeforeTypeAnnotation: false
-            };
-            // Open the first file by default
-            this.openFile(0);
-            function memoWrap(ls, target) {
-                var cacheableMembers = [
-                    "getCompletionEntryDetails",
-                    "getCompletionEntrySymbol",
-                    "getQuickInfoAtPosition",
-                    "getReferencesAtPosition",
-                    "getDocumentHighlights",
-                ];
-                var proxy = {};
-                var _loop_4 = function (k) {
-                    var key = k;
-                    if (cacheableMembers.indexOf(key) === -1) {
-                        proxy[key] = function () {
-                            var args = [];
-                            for (var _i = 0; _i < arguments.length; _i++) {
-                                args[_i] = arguments[_i];
-                            }
-                            return ls[key].apply(ls, args);
-                        };
-                        return "continue";
-                    }
-                    var memo = Utils.memoize(function (_version, _active, _caret, _selectEnd, _marker) {
-                        var args = [];
-                        for (var _i = 5; _i < arguments.length; _i++) {
-                            args[_i - 5] = arguments[_i];
-                        }
-                        return ls[key].apply(ls, args);
-                    }, function () {
-                        var args = [];
-                        for (var _i = 0; _i < arguments.length; _i++) {
-                            args[_i] = arguments[_i];
-                        }
-                        return args.join("|,|");
-                    });
-                    proxy[key] = function () {
-                        var args = [];
-                        for (var _i = 0; _i < arguments.length; _i++) {
-                            args[_i] = arguments[_i];
-                        }
-                        return memo.apply(void 0, [target.languageServiceAdapterHost.getScriptInfo(target.activeFile.fileName).version,
-                            target.activeFile.fileName,
-                            target.currentCaretPosition,
-                            target.selectionEnd,
-                            target.lastKnownMarker].concat(args));
-                    };
-                };
-                for (var k in ls) {
-                    _loop_4(k);
-                }
-                return proxy;
-            }
-        }
-        TestState.getDisplayPartsJson = function (displayParts) {
-            var result = "";
-            ts.forEach(displayParts, function (part) {
-                if (result) {
-                    result += ",\n    ";
-                }
-                else {
-                    result = "[\n    ";
-                }
-                result += JSON.stringify(part);
-            });
-            if (result) {
-                result += "\n]";
-            }
-            return result;
-        };
-        // Add input file which has matched file name with the given reference-file path.
-        // This is necessary when resolveReference flag is specified
-        TestState.prototype.addMatchedInputFile = function (referenceFilePath, extensions) {
-            var inputFiles = this.inputFiles;
-            var languageServiceAdapterHost = this.languageServiceAdapterHost;
-            var didAdd = tryAdd(referenceFilePath);
-            if (extensions && !didAdd) {
-                ts.forEach(extensions, function (ext) { return tryAdd(referenceFilePath + ext); });
-            }
-            function tryAdd(path) {
-                var inputFile = inputFiles.get(path);
-                if (inputFile && !Harness.isDefaultLibraryFile(path)) {
-                    languageServiceAdapterHost.addScript(path, inputFile, /*isRootFile*/ true);
-                    return true;
-                }
-            }
-        };
-        TestState.prototype.getLanguageServiceAdapter = function (testType, cancellationToken, compilationOptions) {
-            switch (testType) {
-                case 0 /* Native */:
-                    return new Harness.LanguageService.NativeLanguageServiceAdapter(cancellationToken, compilationOptions);
-                case 1 /* Shims */:
-                    return new Harness.LanguageService.ShimLanguageServiceAdapter(/*preprocessToResolve*/ false, cancellationToken, compilationOptions);
-                case 2 /* ShimsWithPreprocess */:
-                    return new Harness.LanguageService.ShimLanguageServiceAdapter(/*preprocessToResolve*/ true, cancellationToken, compilationOptions);
-                case 3 /* Server */:
-                    return new Harness.LanguageService.ServerLanguageServiceAdapter(cancellationToken, compilationOptions);
-                default:
-                    throw new Error("Unknown FourSlash test type: ");
-            }
-        };
-        TestState.prototype.getFileContent = function (fileName) {
-            var script = this.languageServiceAdapterHost.getScriptInfo(fileName);
-            return script.content;
-        };
-        // Entry points from fourslash.ts
-        TestState.prototype.goToMarker = function (name) {
-            if (name === void 0) { name = ""; }
-            var marker = ts.isString(name) ? this.getMarkerByName(name) : name;
-            if (this.activeFile.fileName !== marker.fileName) {
-                this.openFile(marker.fileName);
-            }
-            var content = this.getFileContent(marker.fileName);
-            if (marker.position === -1 || marker.position > content.length) {
-                throw new Error("Marker \"" + name + "\" has been invalidated by unrecoverable edits to the file.");
-            }
-            var mName = ts.isString(name) ? name : this.markerName(marker);
-            this.lastKnownMarker = mName;
-            this.goToPosition(marker.position);
-        };
-        TestState.prototype.goToEachMarker = function (markers, action) {
-            assert(markers.length);
-            for (var i = 0; i < markers.length; i++) {
-                this.goToMarker(markers[i]);
-                action(markers[i], i);
-            }
-        };
-        TestState.prototype.goToEachRange = function (action) {
-            var ranges = this.getRanges();
-            assert(ranges.length);
-            for (var _i = 0, ranges_1 = ranges; _i < ranges_1.length; _i++) {
-                var range = ranges_1[_i];
-                this.selectRange(range);
-                action();
-            }
-        };
-        TestState.prototype.markerName = function (m) {
-            return ts.forEachEntry(this.testData.markerPositions, function (marker, name) {
-                if (marker === m) {
-                    return name;
-                }
-            });
-        };
-        TestState.prototype.goToPosition = function (pos) {
-            this.currentCaretPosition = pos;
-            this.selectionEnd = -1;
-        };
-        TestState.prototype.select = function (startMarker, endMarker) {
-            var start = this.getMarkerByName(startMarker), end = this.getMarkerByName(endMarker);
-            ts.Debug.assert(start.fileName === end.fileName);
-            if (this.activeFile.fileName !== start.fileName) {
-                this.openFile(start.fileName);
-            }
-            this.goToPosition(start.position);
-            this.selectionEnd = end.position;
-        };
-        TestState.prototype.selectRange = function (range) {
-            this.goToRangeStart(range);
-            this.selectionEnd = range.end;
-        };
-        TestState.prototype.moveCaretRight = function (count) {
-            if (count === void 0) { count = 1; }
-            this.currentCaretPosition += count;
-            this.currentCaretPosition = Math.min(this.currentCaretPosition, this.getFileContent(this.activeFile.fileName).length);
-            this.selectionEnd = -1;
-        };
-        // Opens a file given its 0-based index or fileName
-        TestState.prototype.openFile = function (indexOrName, content, scriptKindName) {
-            var fileToOpen = this.findFile(indexOrName);
-            fileToOpen.fileName = ts.normalizeSlashes(fileToOpen.fileName);
-            this.activeFile = fileToOpen;
-            // Let the host know that this file is now open
-            this.languageServiceAdapterHost.openFile(fileToOpen.fileName, content, scriptKindName);
-        };
-        TestState.prototype.verifyErrorExistsBetweenMarkers = function (startMarkerName, endMarkerName, shouldExist) {
-            var startMarker = this.getMarkerByName(startMarkerName);
-            var endMarker = this.getMarkerByName(endMarkerName);
-            var predicate = function (errorMinChar, errorLimChar, startPos, endPos) {
-                return ((errorMinChar === startPos) && (errorLimChar === endPos)) ? true : false;
-            };
-            var exists = this.anyErrorInRange(predicate, startMarker, endMarker);
-            if (exists !== shouldExist) {
-                this.printErrorLog(shouldExist, this.getAllDiagnostics());
-                throw new Error((shouldExist ? "Expected" : "Did not expect") + " failure between markers: '" + startMarkerName + "', '" + endMarkerName + "'");
-            }
-        };
-        TestState.prototype.raiseError = function (message) {
-            throw new Error(this.messageAtLastKnownMarker(message));
-        };
-        TestState.prototype.messageAtLastKnownMarker = function (message) {
-            var locationDescription = this.lastKnownMarker ? this.lastKnownMarker : this.getLineColStringAtPosition(this.currentCaretPosition);
-            return "At " + locationDescription + ": " + message;
-        };
-        TestState.prototype.assertionMessageAtLastKnownMarker = function (msg) {
-            return "\nMarker: " + this.lastKnownMarker + "\nChecking: " + msg + "\n\n";
-        };
-        TestState.prototype.getDiagnostics = function (fileName, includeSuggestions) {
-            if (includeSuggestions === void 0) { includeSuggestions = false; }
-            return this.languageService.getSyntacticDiagnostics(fileName).concat(this.languageService.getSemanticDiagnostics(fileName), (includeSuggestions ? this.languageService.getSuggestionDiagnostics(fileName) : ts.emptyArray));
-        };
-        TestState.prototype.getAllDiagnostics = function () {
-            var _this = this;
-            return ts.flatMap(this.languageServiceAdapterHost.getFilenames(), function (fileName) {
-                return ts.isAnySupportedFileExtension(fileName) ? _this.getDiagnostics(fileName) : [];
-            });
-        };
-        TestState.prototype.verifyErrorExistsAfterMarker = function (markerName, shouldExist, after) {
-            var marker = this.getMarkerByName(markerName);
-            var predicate;
-            if (after) {
-                predicate = function (errorMinChar, errorLimChar, startPos) {
-                    return ((errorMinChar >= startPos) && (errorLimChar >= startPos)) ? true : false;
-                };
-            }
-            else {
-                predicate = function (errorMinChar, errorLimChar, startPos) {
-                    return ((errorMinChar <= startPos) && (errorLimChar <= startPos)) ? true : false;
-                };
-            }
-            var exists = this.anyErrorInRange(predicate, marker);
-            var diagnostics = this.getAllDiagnostics();
-            if (exists !== shouldExist) {
-                this.printErrorLog(shouldExist, diagnostics);
-                throw new Error((shouldExist ? "Expected" : "Did not expect") + " failure at marker '" + markerName + "'");
-            }
-        };
-        TestState.prototype.anyErrorInRange = function (predicate, startMarker, endMarker) {
-            return this.getDiagnostics(startMarker.fileName).some(function (_a) {
-                var start = _a.start, length = _a.length;
-                return predicate(start, start + length, startMarker.position, endMarker === undefined ? undefined : endMarker.position);
-            }); // TODO: GH#18217
-        };
-        TestState.prototype.printErrorLog = function (expectErrors, errors) {
-            if (expectErrors) {
-                Harness.IO.log("Expected error not found.  Error list is:");
-            }
-            else {
-                Harness.IO.log("Unexpected error(s) found.  Error list is:");
-            }
-            for (var _i = 0, errors_1 = errors; _i < errors_1.length; _i++) {
-                var _a = errors_1[_i], start = _a.start, length = _a.length, messageText = _a.messageText, file = _a.file;
-                Harness.IO.log("  " + this.formatRange(file, start, length) + // TODO: GH#18217
-                    ", message: " + ts.flattenDiagnosticMessageText(messageText, Harness.IO.newLine()) + "\n");
-            }
-        };
-        TestState.prototype.formatRange = function (file, start, length) {
-            if (file) {
-                return "from: " + this.formatLineAndCharacterOfPosition(file, start) + ", to: " + this.formatLineAndCharacterOfPosition(file, start + length);
-            }
-            return "global";
-        };
-        TestState.prototype.formatLineAndCharacterOfPosition = function (file, pos) {
-            if (file) {
-                var _a = ts.getLineAndCharacterOfPosition(file, pos), line = _a.line, character = _a.character;
-                return line + ":" + character;
-            }
-            return "global";
-        };
-        TestState.prototype.formatPosition = function (file, pos) {
-            if (file) {
-                return file.fileName + "@" + pos;
-            }
-            return "global";
-        };
-        TestState.prototype.verifyNoErrors = function () {
-            var _this = this;
-            ts.forEachKey(this.inputFiles, function (fileName) {
-                if (!ts.isAnySupportedFileExtension(fileName)
-                    || !_this.getProgram().getCompilerOptions().allowJs && !ts.extensionIsTypeScript(ts.extensionFromPath(fileName)))
-                    return;
-                var errors = _this.getDiagnostics(fileName).filter(function (e) { return e.category !== ts.DiagnosticCategory.Suggestion; });
-                if (errors.length) {
-                    _this.printErrorLog(/*expectErrors*/ false, errors);
-                    var error = errors[0];
-                    _this.raiseError("Found an error: " + _this.formatPosition(error.file, error.start) + ": " + error.messageText);
-                }
-            });
-        };
-        TestState.prototype.verifyNumberOfErrorsInCurrentFile = function (expected) {
-            var errors = this.getDiagnostics(this.activeFile.fileName);
-            var actual = errors.length;
-            if (actual !== expected) {
-                this.printErrorLog(/*expectErrors*/ false, errors);
-                var errorMsg = "Actual number of errors (" + actual + ") does not match expected number (" + expected + ")";
-                Harness.IO.log(errorMsg);
-                this.raiseError(errorMsg);
-            }
-        };
-        TestState.prototype.verifyEval = function (expr, value) {
-            var emit = this.languageService.getEmitOutput(this.activeFile.fileName);
-            if (emit.outputFiles.length !== 1) {
-                throw new Error("Expected exactly one output from emit of " + this.activeFile.fileName);
-            }
-            var evaluation = new Function(emit.outputFiles[0].text + ";\r\nreturn (" + expr + ");")();
-            if (evaluation !== value) {
-                this.raiseError("Expected evaluation of expression \"" + expr + "\" to equal \"" + value + "\", but got \"" + evaluation + "\"");
-            }
-        };
-        TestState.prototype.verifyGoToDefinitionIs = function (endMarker) {
-            var _this = this;
-            this.verifyGoToXWorker(toArray(endMarker), function () { return _this.getGoToDefinition(); });
-        };
-        TestState.prototype.verifyGoToDefinition = function (arg0, endMarkerNames) {
-            var _this = this;
-            this.verifyGoToX(arg0, endMarkerNames, function () { return _this.getGoToDefinitionAndBoundSpan(); });
-        };
-        TestState.prototype.getGoToDefinition = function () {
-            return this.languageService.getDefinitionAtPosition(this.activeFile.fileName, this.currentCaretPosition);
-        };
-        TestState.prototype.getGoToDefinitionAndBoundSpan = function () {
-            return this.languageService.getDefinitionAndBoundSpan(this.activeFile.fileName, this.currentCaretPosition);
-        };
-        TestState.prototype.verifyGoToType = function (arg0, endMarkerNames) {
-            var _this = this;
-            this.verifyGoToX(arg0, endMarkerNames, function () {
-                return _this.languageService.getTypeDefinitionAtPosition(_this.activeFile.fileName, _this.currentCaretPosition);
-            });
-        };
-        TestState.prototype.verifyGoToX = function (arg0, endMarkerNames, getDefs) {
-            if (endMarkerNames) {
-                this.verifyGoToXPlain(arg0, endMarkerNames, getDefs);
-            }
-            else if (ts.isArray(arg0)) {
-                var pairs = arg0;
-                for (var _i = 0, pairs_1 = pairs; _i < pairs_1.length; _i++) {
-                    var _a = pairs_1[_i], start = _a[0], end = _a[1];
-                    this.verifyGoToXPlain(start, end, getDefs);
-                }
-            }
-            else {
-                var obj = arg0;
-                for (var startMarkerName in obj) {
-                    if (ts.hasProperty(obj, startMarkerName)) {
-                        this.verifyGoToXPlain(startMarkerName, obj[startMarkerName], getDefs);
-                    }
-                }
-            }
-        };
-        TestState.prototype.verifyGoToXPlain = function (startMarkerNames, endMarkerNames, getDefs) {
-            for (var _i = 0, _a = toArray(startMarkerNames); _i < _a.length; _i++) {
-                var start = _a[_i];
-                this.verifyGoToXSingle(start, endMarkerNames, getDefs);
-            }
-        };
-        TestState.prototype.verifyGoToDefinitionForMarkers = function (markerNames) {
-            var _this = this;
-            for (var _i = 0, markerNames_1 = markerNames; _i < markerNames_1.length; _i++) {
-                var markerName = markerNames_1[_i];
-                this.verifyGoToXSingle(markerName + "Reference", markerName + "Definition", function () { return _this.getGoToDefinition(); });
-            }
-        };
-        TestState.prototype.verifyGoToXSingle = function (startMarkerName, endMarkerNames, getDefs) {
-            this.goToMarker(startMarkerName);
-            this.verifyGoToXWorker(toArray(endMarkerNames), getDefs, startMarkerName);
-        };
-        TestState.prototype.verifyGoToXWorker = function (endMarkers, getDefs, startMarkerName) {
-            var _this = this;
-            var defs = getDefs();
-            var definitions;
-            var testName;
-            if (!defs || ts.isArray(defs)) {
-                definitions = defs || [];
-                testName = "goToDefinitions";
-            }
-            else {
-                this.verifyDefinitionTextSpan(defs, startMarkerName);
-                definitions = defs.definitions; // TODO: GH#18217
-                testName = "goToDefinitionsAndBoundSpan";
-            }
-            if (endMarkers.length !== definitions.length) {
-                this.raiseError(testName + " failed - expected to find " + endMarkers.length + " definitions but got " + definitions.length);
-            }
-            ts.zipWith(endMarkers, definitions, function (endMarker, definition, i) {
-                var marker = _this.getMarkerByName(endMarker);
-                if (marker.fileName !== definition.fileName || marker.position !== definition.textSpan.start) {
-                    _this.raiseError(testName + " failed for definition " + endMarker + " (" + i + "): expected " + marker.fileName + " at " + marker.position + ", got " + definition.fileName + " at " + definition.textSpan.start);
-                }
-            });
-        };
-        TestState.prototype.verifyDefinitionTextSpan = function (defs, startMarkerName) {
-            var _this = this;
-            var range = this.testData.ranges.find(function (range) { return _this.markerName(range.marker) === startMarkerName; });
-            if (!range && !defs.textSpan) {
-                return;
-            }
-            if (!range) {
-                this.raiseError("goToDefinitionsAndBoundSpan failed - found a TextSpan " + JSON.stringify(defs.textSpan) + " when it wasn't expected.");
-            }
-            else if (defs.textSpan.start !== range.pos || defs.textSpan.length !== range.end - range.pos) {
-                var expected = {
-                    start: range.pos, length: range.end - range.pos
-                };
-                this.raiseError("goToDefinitionsAndBoundSpan failed - expected to find TextSpan " + JSON.stringify(expected) + " but got " + JSON.stringify(defs.textSpan));
-            }
-        };
-        TestState.prototype.verifyGetEmitOutputForCurrentFile = function (expected) {
-            var emit = this.languageService.getEmitOutput(this.activeFile.fileName);
-            if (emit.outputFiles.length !== 1) {
-                throw new Error("Expected exactly one output from emit of " + this.activeFile.fileName);
-            }
-            var actual = emit.outputFiles[0].text;
-            if (actual !== expected) {
-                this.raiseError("Expected emit output to be \"" + expected + "\", but got \"" + actual + "\"");
-            }
-        };
-        TestState.prototype.verifyGetEmitOutputContentsForCurrentFile = function (expected) {
-            var emit = this.languageService.getEmitOutput(this.activeFile.fileName);
-            assert.equal(emit.outputFiles.length, expected.length, "Number of emit output files");
-            ts.zipWith(emit.outputFiles, expected, function (outputFile, expected) {
-                assert.equal(outputFile.name, expected.name, "FileName");
-                assert.equal(outputFile.text, expected.text, "Content");
-            });
-        };
-        TestState.prototype.verifyCompletionListCount = function (expectedCount, negative) {
-            if (expectedCount === 0 && negative) {
-                this.verifyCompletionListIsEmpty(/*negative*/ false);
-                return;
-            }
-            var members = this.getCompletionListAtCaret();
-            if (members) {
-                var match = members.entries.length === expectedCount;
-                if ((!match && !negative) || (match && negative)) {
-                    this.raiseError("Member list count was " + members.entries.length + ". Expected " + expectedCount);
-                }
-            }
-            else if (expectedCount) {
-                this.raiseError("Member list count was 0. Expected " + expectedCount);
-            }
-        };
-        TestState.prototype.verifyCompletionListItemsCountIsGreaterThan = function (count, negative) {
-            var completions = this.getCompletionListAtCaret();
-            var itemsCount = completions ? completions.entries.length : 0;
-            if (negative) {
-                if (itemsCount > count) {
-                    this.raiseError("Expected completion list items count to not be greater than " + count + ", but is actually " + itemsCount);
-                }
-            }
-            else {
-                if (itemsCount <= count) {
-                    this.raiseError("Expected completion list items count to be greater than " + count + ", but is actually " + itemsCount);
-                }
-            }
-        };
-        TestState.prototype.verifyCompletionListStartsWithItemsInOrder = function (items) {
-            if (items.length === 0) {
-                return;
-            }
-            var entries = this.getCompletionListAtCaret().entries;
-            assert.isTrue(items.length <= entries.length, "Amount of expected items in completion list [ " + items.length + " ] is greater than actual number of items in list [ " + entries.length + " ]");
-            ts.zipWith(entries, items, function (entry, item) {
-                assert.equal(entry.name, item, "Unexpected item in completion list");
-            });
-        };
-        TestState.prototype.noItemsWithSameNameButDifferentKind = function () {
-            var completions = this.getCompletionListAtCaret();
-            var uniqueItems = ts.createMap();
-            for (var _i = 0, _a = completions.entries; _i < _a.length; _i++) {
-                var item = _a[_i];
-                var uniqueItem = uniqueItems.get(item.name);
-                if (!uniqueItem) {
-                    uniqueItems.set(item.name, item.kind);
-                }
-                else {
-                    assert.equal(item.kind, uniqueItem, "Items should have the same kind, got " + item.kind + " and " + uniqueItem);
-                }
-            }
-        };
-        TestState.prototype.verifyCompletionListIsEmpty = function (negative) {
-            var completions = this.getCompletionListAtCaret();
-            if ((!completions || completions.entries.length === 0) && negative) {
-                this.raiseError("Completion list is empty at caret at position " + this.activeFile.fileName + " " + this.currentCaretPosition);
-            }
-            else if (completions && completions.entries.length !== 0 && !negative) {
-                this.raiseError("Completion list is not empty at caret at position " + this.activeFile.fileName + " " + this.currentCaretPosition + "\n" +
-                    ("Completion List contains: " + stringify(completions.entries.map(function (e) { return e.name; }))));
-            }
-        };
-        TestState.prototype.verifyCompletionListAllowsNewIdentifier = function (negative) {
-            var completions = this.getCompletionListAtCaret();
-            if ((completions && !completions.isNewIdentifierLocation) && !negative) {
-                this.raiseError("Expected builder completion entry");
-            }
-            else if ((completions && completions.isNewIdentifierLocation) && negative) {
-                this.raiseError("Un-expected builder completion entry");
-            }
-        };
-        TestState.prototype.verifyCompletionListIsGlobal = function (expected) {
-            var completions = this.getCompletionListAtCaret();
-            if (completions && completions.isGlobalCompletion !== expected) {
-                this.raiseError("verifyCompletionListIsGlobal failed - expected result to be " + completions.isGlobalCompletion);
-            }
-        };
-        TestState.prototype.verifyCompletions = function (options) {
-            if (options.marker === undefined) {
-                this.verifyCompletionsWorker(options);
-            }
-            else {
-                for (var _i = 0, _a = toArray(options.marker); _i < _a.length; _i++) {
-                    var marker = _a[_i];
-                    this.goToMarker(marker);
-                    this.verifyCompletionsWorker(options);
-                }
-            }
-        };
-        TestState.prototype.verifyCompletionsWorker = function (options) {
-            var actualCompletions = this.getCompletionListAtCaret(__assign({}, options.preferences, { triggerCharacter: options.triggerCharacter }));
-            if (!actualCompletions) {
-                if (options.exact === undefined)
-                    return;
-                this.raiseError("No completions at position '" + this.currentCaretPosition + "'.");
-            }
-            if (actualCompletions.isNewIdentifierLocation !== (options.isNewIdentifierLocation || false)) {
-                this.raiseError("Expected 'isNewIdentifierLocation' to be " + (options.isNewIdentifierLocation || false) + ", got " + actualCompletions.isNewIdentifierLocation);
-            }
-            var actualByName = ts.createMap();
-            var _loop_5 = function (entry) {
-                if (actualByName.has(entry.name)) {
-                    // TODO: GH#23587
-                    if (entry.name !== "undefined" && entry.name !== "require")
-                        this_1.raiseError("Duplicate (" + actualCompletions.entries.filter(function (a) { return a.name === entry.name; }).length + ") completions for " + entry.name);
-                }
-                else {
-                    actualByName.set(entry.name, entry);
-                }
-            };
-            var this_1 = this;
-            for (var _i = 0, _a = actualCompletions.entries; _i < _a.length; _i++) {
-                var entry = _a[_i];
-                _loop_5(entry);
-            }
-            if ("exact" in options) {
-                ts.Debug.assert(!("includes" in options) && !("excludes" in options));
-                if (options.exact === undefined)
-                    throw this.raiseError("Expected no completions");
-                this.verifyCompletionsAreExactly(actualCompletions.entries, toArray(options.exact));
-            }
-            else {
-                if (options.includes) {
-                    for (var _b = 0, _c = toArray(options.includes); _b < _c.length; _b++) {
-                        var include = _c[_b];
-                        var name = typeof include === "string" ? include : include.name;
-                        var found = actualByName.get(name);
-                        if (!found)
-                            throw this.raiseError("No completion " + name + " found");
-                        this.verifyCompletionEntry(found, include);
-                    }
-                }
-                if (options.excludes) {
-                    for (var _d = 0, _e = toArray(options.excludes); _d < _e.length; _d++) {
-                        var exclude = _e[_d];
-                        if (typeof exclude === "string") {
-                            if (actualByName.has(exclude)) {
-                                this.raiseError("Did not expect to get a completion named " + exclude);
-                            }
-                        }
-                        else {
-                            var found = actualByName.get(exclude.name);
-                            if (found && found.source === exclude.source) {
-                                this.raiseError("Did not expect to get a completion named " + exclude.name + " with source " + exclude.source);
-                            }
-                        }
-                    }
-                }
-            }
-        };
-        TestState.prototype.verifyCompletionEntry = function (actual, expected) {
-            var _a = typeof expected === "string"
-                ? { insertText: undefined, replacementSpan: undefined, hasAction: undefined, isRecommended: undefined, kind: undefined, text: undefined, documentation: undefined, sourceDisplay: undefined }
-                : expected, insertText = _a.insertText, replacementSpan = _a.replacementSpan, hasAction = _a.hasAction, isRecommended = _a.isRecommended, kind = _a.kind, text = _a.text, documentation = _a.documentation, sourceDisplay = _a.sourceDisplay;
-            if (actual.insertText !== insertText) {
-                this.raiseError("Expected completion insert text to be " + insertText + ", got " + actual.insertText);
-            }
-            var convertedReplacementSpan = replacementSpan && ts.createTextSpanFromRange(replacementSpan);
-            try {
-                assert.deepEqual(actual.replacementSpan, convertedReplacementSpan);
-            }
-            catch (_b) {
-                this.raiseError("Expected completion replacementSpan to be " + stringify(convertedReplacementSpan) + ", got " + stringify(actual.replacementSpan));
-            }
-            if (kind !== undefined)
-                assert.equal(actual.kind, kind);
-            assert.equal(actual.hasAction, hasAction);
-            assert.equal(actual.isRecommended, isRecommended);
-            if (text) {
-                var actualDetails = this.getCompletionEntryDetails(actual.name, actual.source);
-                assert.equal(ts.displayPartsToString(actualDetails.displayParts), text);
-                assert.equal(ts.displayPartsToString(actualDetails.documentation), documentation || "");
-                // TODO: GH#23587
-                // assert.equal(actualDetails.kind, actual.kind);
-                assert.equal(actualDetails.kindModifiers, actual.kindModifiers);
-                assert.equal(actualDetails.source && ts.displayPartsToString(actualDetails.source), sourceDisplay);
-            }
-            else {
-                assert(documentation === undefined && sourceDisplay === undefined, "If specifying completion details, should specify 'text'");
-            }
-        };
-        TestState.prototype.verifyCompletionsAreExactly = function (actual, expected) {
-            var _this = this;
-            if (actual.length !== expected.length) {
-                this.raiseError("Expected " + expected.length + " completions, got " + actual.length + " (" + actual.map(function (a) { return a.name; }) + ").");
-            }
-            ts.zipWith(actual, expected, function (completion, expectedCompletion, index) {
-                var name = typeof expectedCompletion === "string" ? expectedCompletion : expectedCompletion.name;
-                if (completion.name !== name) {
-                    _this.raiseError("Expected completion at index " + index + " to be " + name + ", got " + completion.name);
-                }
-                _this.verifyCompletionEntry(completion, expectedCompletion);
-            });
-        };
-        TestState.prototype.verifyCompletionsAt = function (markerName, expected, options) {
-            this.verifyCompletions({
-                marker: markerName,
-                exact: expected,
-                isNewIdentifierLocation: options && options.isNewIdentifierLocation,
-                preferences: options,
-                triggerCharacter: options && options.triggerCharacter,
-            });
-        };
-        TestState.prototype.verifyCompletionListContains = function (entryId, text, documentation, kind, spanIndex, hasAction, options) {
-            var completions = this.getCompletionListAtCaret(options);
-            if (completions) {
-                this.assertItemInCompletionList(completions.entries, entryId, text, documentation, kind, spanIndex, hasAction, options);
-            }
-            else {
-                this.raiseError("No completions at position '" + this.currentCaretPosition + "' when looking for '" + JSON.stringify(entryId) + "'.");
-            }
-        };
-        /**
-         * Verify that the completion list does NOT contain the given symbol.
-         * The symbol is considered matched with the symbol in the list if and only if all given parameters must matched.
-         * When any parameter is omitted, the parameter is ignored during comparison and assumed that the parameter with
-         * that property of the symbol in the list.
-         * @param symbol the name of symbol
-         * @param expectedText the text associated with the symbol
-         * @param expectedDocumentation the documentation text associated with the symbol
-         * @param expectedKind the kind of symbol (see ScriptElementKind)
-         * @param spanIndex the index of the range that the completion item's replacement text span should match
-         */
-        TestState.prototype.verifyCompletionListDoesNotContain = function (entryId, expectedText, expectedDocumentation, expectedKind, spanIndex, options) {
-            var _this = this;
-            var replacementSpan;
-            if (spanIndex !== undefined) {
-                replacementSpan = this.getTextSpanForRangeAtIndex(spanIndex);
-            }
-            var completions = this.getCompletionListAtCaret(options);
-            if (completions) {
-                var filterCompletions = completions.entries.filter(function (e) { return e.name === entryId.name && e.source === entryId.source; });
-                filterCompletions = expectedKind ? filterCompletions.filter(function (e) { return e.kind === expectedKind || (typeof expectedKind === "object" && e.kind === expectedKind.kind); }) : filterCompletions;
-                filterCompletions = filterCompletions.filter(function (entry) {
-                    var details = _this.getCompletionEntryDetails(entry.name);
-                    var documentation = details && ts.displayPartsToString(details.documentation);
-                    var text = details && ts.displayPartsToString(details.displayParts);
-                    // If any of the expected values are undefined, assume that users don't
-                    // care about them.
-                    if (replacementSpan && !TestState.textSpansEqual(replacementSpan, entry.replacementSpan)) {
-                        return false;
-                    }
-                    else if (expectedText && text !== expectedText) {
-                        return false;
-                    }
-                    else if (expectedDocumentation && documentation !== expectedDocumentation) {
-                        return false;
-                    }
-                    return true;
-                });
-                if (filterCompletions.length !== 0) {
-                    // After filtered using all present criterion, if there are still symbol left in the list
-                    // then these symbols must meet the criterion for Not supposed to be in the list. So we
-                    // raise an error
-                    var error = "Completion list did contain '" + JSON.stringify(entryId) + "'.";
-                    var details = this.getCompletionEntryDetails(filterCompletions[0].name);
-                    if (expectedText) {
-                        error += "Expected text: " + expectedText + " to equal: " + ts.displayPartsToString(details.displayParts) + ".";
-                    }
-                    if (expectedDocumentation) {
-                        error += "Expected documentation: " + expectedDocumentation + " to equal: " + ts.displayPartsToString(details.documentation) + ".";
-                    }
-                    if (expectedKind) {
-                        error += "Expected kind: " + expectedKind + " to equal: " + filterCompletions[0].kind + ".";
-                    }
-                    else {
-                        error += "kind: " + filterCompletions[0].kind + ".";
-                    }
-                    if (replacementSpan) {
-                        var spanText = filterCompletions[0].replacementSpan ? stringify(filterCompletions[0].replacementSpan) : undefined;
-                        error += "Expected replacement span: " + stringify(replacementSpan) + " to equal: " + spanText + ".";
-                    }
-                    this.raiseError(error);
-                }
-            }
-        };
-        TestState.prototype.verifyCompletionEntryDetails = function (entryName, expectedText, expectedDocumentation, kind, tags) {
-            var _this = this;
-            var details = this.getCompletionEntryDetails(entryName);
-            assert(details, "no completion entry available");
-            assert.equal(ts.displayPartsToString(details.displayParts), expectedText, this.assertionMessageAtLastKnownMarker("completion entry details text"));
-            if (expectedDocumentation !== undefined) {
-                assert.equal(ts.displayPartsToString(details.documentation), expectedDocumentation, this.assertionMessageAtLastKnownMarker("completion entry documentation"));
-            }
-            if (kind !== undefined) {
-                assert.equal(details.kind, kind, this.assertionMessageAtLastKnownMarker("completion entry kind"));
-            }
-            if (tags !== undefined) {
-                assert.equal(details.tags.length, tags.length, this.messageAtLastKnownMarker("QuickInfo tags"));
-                ts.zipWith(tags, details.tags, function (expectedTag, actualTag) {
-                    assert.equal(actualTag.name, expectedTag.name);
-                    assert.equal(actualTag.text, expectedTag.text, _this.messageAtLastKnownMarker("QuickInfo tag " + actualTag.name));
-                });
-            }
-        };
-        TestState.prototype.getProgram = function () {
-            return this._program || (this._program = this.languageService.getProgram()); // TODO: GH#18217
-        };
-        TestState.prototype.getChecker = function () {
-            return this._checker || (this._checker = this.getProgram().getTypeChecker());
-        };
-        TestState.prototype.getSourceFile = function () {
-            var fileName = this.activeFile.fileName;
-            var result = this.getProgram().getSourceFile(fileName);
-            if (!result) {
-                throw new Error("Could not get source file " + fileName);
-            }
-            return result;
-        };
-        TestState.prototype.getNode = function () {
-            return ts.getTouchingPropertyName(this.getSourceFile(), this.currentCaretPosition);
-        };
-        TestState.prototype.goToAndGetNode = function (range) {
-            this.goToRangeStart(range);
-            var node = this.getNode();
-            this.verifyRange("touching property name", range, node);
-            return node;
-        };
-        TestState.prototype.verifyRange = function (desc, expected, actual) {
-            var actualStart = actual.getStart();
-            var actualEnd = actual.getEnd();
-            if (actualStart !== expected.pos || actualEnd !== expected.end) {
-                this.raiseError(desc + " should be " + expected.pos + "-" + expected.end + ", got " + actualStart + "-" + actualEnd);
-            }
-        };
-        TestState.prototype.verifySymbol = function (symbol, declarationRanges) {
-            var _this = this;
-            var declarations = symbol.declarations;
-            if (declarations.length !== declarationRanges.length) {
-                this.raiseError("Expected to get " + declarationRanges.length + " declarations, got " + declarations.length);
-            }
-            ts.zipWith(declarations, declarationRanges, function (decl, range) {
-                _this.verifyRange("symbol declaration", range, decl);
-            });
-        };
-        TestState.prototype.verifySymbolAtLocation = function (startRange, declarationRanges) {
-            var node = this.goToAndGetNode(startRange);
-            var symbol = this.getChecker().getSymbolAtLocation(node);
-            if (!symbol) {
-                this.raiseError("Could not get symbol at location");
-            }
-            this.verifySymbol(symbol, declarationRanges);
-        };
-        TestState.prototype.symbolsInScope = function (range) {
-            var node = this.goToAndGetNode(range);
-            return this.getChecker().getSymbolsInScope(node, 67216319 /* Value */ | 67901928 /* Type */ | 1920 /* Namespace */);
-        };
-        TestState.prototype.setTypesRegistry = function (map) {
-            this.languageServiceAdapterHost.typesRegistry = ts.createMapFromTemplate(map);
-        };
-        TestState.prototype.verifyTypeOfSymbolAtLocation = function (range, symbol, expected) {
-            var node = this.goToAndGetNode(range);
-            var checker = this.getChecker();
-            var type = checker.getTypeOfSymbolAtLocation(symbol, node);
-            var actual = checker.typeToString(type);
-            if (actual !== expected) {
-                this.raiseError("Expected: '" + expected + "', actual: '" + actual + "'");
-            }
-        };
-        TestState.prototype.verifyDocumentHighlightsRespectFilesList = function (files) {
-            var startFile = this.activeFile.fileName;
-            var _loop_6 = function (fileName) {
-                var searchFileNames = startFile === fileName ? [startFile] : [startFile, fileName];
-                var highlights = this_2.getDocumentHighlightsAtCurrentPosition(searchFileNames);
-                if (!highlights.every(function (dh) { return ts.contains(searchFileNames, dh.fileName); })) {
-                    this_2.raiseError("When asking for document highlights only in files " + searchFileNames + ", got document highlights in " + unique(highlights, function (dh) { return dh.fileName; }));
-                }
-            };
-            var this_2 = this;
-            for (var _i = 0, files_3 = files; _i < files_3.length; _i++) {
-                var fileName = files_3[_i];
-                _loop_6(fileName);
-            }
-        };
-        TestState.prototype.verifyReferenceGroups = function (starts, parts) {
-            var fullExpected = ts.map(parts, function (_a) {
-                var definition = _a.definition, ranges = _a.ranges;
-                return ({
-                    definition: typeof definition === "string" ? definition : __assign({}, definition, { range: ts.createTextSpanFromRange(definition.range) }),
-                    references: ranges.map(function (r) {
-                        var _a = (r.marker && r.marker.data || {}), _b = _a.isWriteAccess, isWriteAccess = _b === void 0 ? false : _b, _c = _a.isDefinition, isDefinition = _c === void 0 ? false : _c, isInString = _a.isInString;
-                        return __assign({ fileName: r.fileName, textSpan: ts.createTextSpanFromRange(r), isWriteAccess: isWriteAccess,
-                            isDefinition: isDefinition }, (isInString ? { isInString: true } : undefined));
-                    }),
-                });
-            });
-            for (var _i = 0, _a = toArray(starts); _i < _a.length; _i++) {
-                var start = _a[_i];
-                if (typeof start === "string") {
-                    this.goToMarker(start);
-                }
-                else {
-                    this.goToRangeStart(start);
-                }
-                var fullActual = ts.map(this.findReferencesAtCaret(), function (_a, i) {
-                    var definition = _a.definition, references = _a.references;
-                    var text = definition.displayParts.map(function (d) { return d.text; }).join("");
-                    return {
-                        definition: fullExpected.length > i && typeof fullExpected[i].definition === "string" ? text : { text: text, range: definition.textSpan },
-                        references: references,
-                    };
-                });
-                this.assertObjectsEqual(fullActual, fullExpected);
-                if (parts) {
-                    this.verifyDocumentHighlightsRespectFilesList(unique(ts.flatMap(parts, function (p) { return p.ranges; }), function (r) { return r.fileName; }));
-                }
-            }
-        };
-        TestState.prototype.verifyNoReferences = function (markerNameOrRange) {
-            if (markerNameOrRange) {
-                if (ts.isString(markerNameOrRange)) {
-                    this.goToMarker(markerNameOrRange);
-                }
-                else {
-                    this.goToRangeStart(markerNameOrRange);
-                }
-            }
-            var refs = this.getReferencesAtCaret();
-            if (refs && refs.length) {
-                this.raiseError("Expected getReferences to fail, but saw references: " + stringify(refs));
-            }
-        };
-        // Necessary to have this function since `findReferences` isn't implemented in `client.ts`
-        TestState.prototype.verifyGetReferencesForServerTest = function (expected) {
-            var refs = this.getReferencesAtCaret();
-            assert.deepEqual(refs, expected);
-        };
-        TestState.prototype.verifySingleReferenceGroup = function (definition, ranges) {
-            ranges = ranges || this.getRanges();
-            this.verifyReferenceGroups(ranges, [{ definition: definition, ranges: ranges }]);
-        };
-        TestState.prototype.assertObjectsEqual = function (fullActual, fullExpected, msgPrefix) {
-            var _this = this;
-            if (msgPrefix === void 0) { msgPrefix = ""; }
-            var recur = function (actual, expected, path) {
-                var fail = function (msg) {
-                    _this.raiseError(msgPrefix + " At " + path + ": " + msg + "\nExpected: " + stringify(fullExpected) + "\nActual: " + stringify(fullActual));
-                };
-                if ((actual === undefined) !== (expected === undefined)) {
-                    fail("Expected " + expected + ", got " + actual);
-                }
-                for (var key in actual) {
-                    if (ts.hasProperty(actual, key)) {
-                        var ak = actual[key], ek = expected[key];
-                        if (typeof ak === "object" && typeof ek === "object") {
-                            recur(ak, ek, path ? path + "." + key : key);
-                        }
-                        else if (ak !== ek) {
-                            fail("Expected '" + key + "' to be '" + ek + "', got '" + ak + "'");
-                        }
-                    }
-                }
-                for (var key in expected) {
-                    if (ts.hasProperty(expected, key)) {
-                        if (!ts.hasProperty(actual, key)) {
-                            fail(msgPrefix + "Missing property '" + key + "'");
-                        }
-                    }
-                }
-            };
-            if (fullActual === undefined || fullExpected === undefined) {
-                if (fullActual === fullExpected) {
-                    return;
-                }
-                this.raiseError(msgPrefix + "\nExpected: " + stringify(fullExpected) + "\nActual: " + stringify(fullActual));
-            }
-            recur(fullActual, fullExpected, "");
-        };
-        TestState.prototype.verifyDisplayPartsOfReferencedSymbol = function (expected) {
-            var referencedSymbols = this.findReferencesAtCaret();
-            if (referencedSymbols.length === 0) {
-                this.raiseError("No referenced symbols found at current caret position");
-            }
-            else if (referencedSymbols.length > 1) {
-                this.raiseError("More than one referenced symbol found");
-            }
-            assert.equal(TestState.getDisplayPartsJson(referencedSymbols[0].definition.displayParts), TestState.getDisplayPartsJson(expected), this.messageAtLastKnownMarker("referenced symbol definition display parts"));
-        };
-        TestState.prototype.getCompletionListAtCaret = function (options) {
-            return this.languageService.getCompletionsAtPosition(this.activeFile.fileName, this.currentCaretPosition, options);
-        };
-        TestState.prototype.getCompletionEntryDetails = function (entryName, source, preferences) {
-            return this.languageService.getCompletionEntryDetails(this.activeFile.fileName, this.currentCaretPosition, entryName, this.formatCodeSettings, source, preferences);
-        };
-        TestState.prototype.getReferencesAtCaret = function () {
-            return this.languageService.getReferencesAtPosition(this.activeFile.fileName, this.currentCaretPosition);
-        };
-        TestState.prototype.findReferencesAtCaret = function () {
-            return this.languageService.findReferences(this.activeFile.fileName, this.currentCaretPosition);
-        };
-        TestState.prototype.getSyntacticDiagnostics = function (expected) {
-            var diagnostics = this.languageService.getSyntacticDiagnostics(this.activeFile.fileName);
-            this.testDiagnostics(expected, diagnostics, "error");
-        };
-        TestState.prototype.getSemanticDiagnostics = function (expected) {
-            var diagnostics = this.languageService.getSemanticDiagnostics(this.activeFile.fileName);
-            this.testDiagnostics(expected, diagnostics, "error");
-        };
-        TestState.prototype.getSuggestionDiagnostics = function (expected) {
-            this.testDiagnostics(expected, this.languageService.getSuggestionDiagnostics(this.activeFile.fileName), "suggestion");
-        };
-        TestState.prototype.testDiagnostics = function (expected, diagnostics, category) {
-            var _this = this;
-            assert.deepEqual(ts.realizeDiagnostics(diagnostics, "\n"), expected.map(function (e) { return (__assign({ message: e.message, category: category, code: e.code }, ts.createTextSpanFromRange(e.range || _this.getRanges()[0]), { reportsUnnecessary: e.reportsUnnecessary })); }));
-        };
-        TestState.prototype.verifyQuickInfoAt = function (markerName, expectedText, expectedDocumentation) {
-            this.goToMarker(markerName);
-            this.verifyQuickInfoString(expectedText, expectedDocumentation);
-        };
-        TestState.prototype.verifyQuickInfos = function (namesAndTexts) {
-            for (var name in namesAndTexts) {
-                if (ts.hasProperty(namesAndTexts, name)) {
-                    var text = namesAndTexts[name];
-                    if (ts.isArray(text)) {
-                        assert(text.length === 2);
-                        var expectedText = text[0], expectedDocumentation = text[1];
-                        this.verifyQuickInfoAt(name, expectedText, expectedDocumentation);
-                    }
-                    else {
-                        this.verifyQuickInfoAt(name, text);
-                    }
-                }
-            }
-        };
-        TestState.prototype.verifyQuickInfoString = function (expectedText, expectedDocumentation) {
-            if (expectedDocumentation === "") {
-                throw new Error("Use 'undefined' instead");
-            }
-            var actualQuickInfo = this.languageService.getQuickInfoAtPosition(this.activeFile.fileName, this.currentCaretPosition);
-            var actualQuickInfoText = actualQuickInfo ? ts.displayPartsToString(actualQuickInfo.displayParts) : "";
-            var actualQuickInfoDocumentation = actualQuickInfo ? ts.displayPartsToString(actualQuickInfo.documentation) : "";
-            assert.equal(actualQuickInfoText, expectedText, this.messageAtLastKnownMarker("quick info text"));
-            assert.equal(actualQuickInfoDocumentation, expectedDocumentation || "", this.assertionMessageAtLastKnownMarker("quick info doc"));
-        };
-        TestState.prototype.verifyQuickInfoDisplayParts = function (kind, kindModifiers, textSpan, displayParts, documentation, tags) {
-            var _this = this;
-            var actualQuickInfo = this.languageService.getQuickInfoAtPosition(this.activeFile.fileName, this.currentCaretPosition);
-            assert.equal(actualQuickInfo.kind, kind, this.messageAtLastKnownMarker("QuickInfo kind"));
-            assert.equal(actualQuickInfo.kindModifiers, kindModifiers, this.messageAtLastKnownMarker("QuickInfo kindModifiers"));
-            assert.equal(JSON.stringify(actualQuickInfo.textSpan), JSON.stringify(textSpan), this.messageAtLastKnownMarker("QuickInfo textSpan"));
-            assert.equal(TestState.getDisplayPartsJson(actualQuickInfo.displayParts), TestState.getDisplayPartsJson(displayParts), this.messageAtLastKnownMarker("QuickInfo displayParts"));
-            assert.equal(TestState.getDisplayPartsJson(actualQuickInfo.documentation), TestState.getDisplayPartsJson(documentation), this.messageAtLastKnownMarker("QuickInfo documentation"));
-            assert.equal(actualQuickInfo.tags.length, tags.length, this.messageAtLastKnownMarker("QuickInfo tags"));
-            ts.zipWith(tags, actualQuickInfo.tags, function (expectedTag, actualTag) {
-                assert.equal(expectedTag.name, actualTag.name);
-                assert.equal(expectedTag.text, actualTag.text, _this.messageAtLastKnownMarker("QuickInfo tag " + actualTag.name));
-            });
-        };
-        TestState.prototype.verifyRangesAreRenameLocations = function (options) {
-            if (ts.isArray(options)) {
-                this.verifyRenameLocations(options, options);
-            }
-            else {
-                var ranges = options && options.ranges || this.getRanges();
-                this.verifyRenameLocations(ranges, __assign({ ranges: ranges }, options));
-            }
-        };
-        TestState.prototype.verifyRenameLocations = function (startRanges, options) {
-            var _this = this;
-            var findInStrings, findInComments, ranges;
-            if (ts.isArray(options)) {
-                findInStrings = findInComments = false;
-                ranges = options;
-            }
-            else {
-                findInStrings = !!options.findInStrings;
-                findInComments = !!options.findInComments;
-                ranges = options.ranges;
-            }
-            var _loop_7 = function (startRange) {
-                this_3.goToRangeStart(startRange);
-                var renameInfo = this_3.languageService.getRenameInfo(this_3.activeFile.fileName, this_3.currentCaretPosition);
-                if (!renameInfo.canRename) {
-                    this_3.raiseError("Expected rename to succeed, but it actually failed.");
-                    return "break";
-                }
-                var references = this_3.languageService.findRenameLocations(this_3.activeFile.fileName, this_3.currentCaretPosition, findInStrings, findInComments);
-                ranges = ranges || this_3.getRanges();
-                if (!references) {
-                    if (ranges.length !== 0) {
-                        this_3.raiseError("Expected " + ranges.length + " rename locations; got none.");
-                    }
-                    return { value: void 0 };
-                }
-                if (ranges.length !== references.length) {
-                    this_3.raiseError("Rename location count does not match result.\n\nExpected: " + stringify(ranges) + "\n\nActual:" + stringify(references));
-                }
-                ranges = ranges.sort(function (r1, r2) { return r1.pos - r2.pos; });
-                references = references.sort(function (r1, r2) { return r1.textSpan.start - r2.textSpan.start; });
-                ts.zipWith(references, ranges, function (reference, range) {
-                    if (reference.textSpan.start !== range.pos || ts.textSpanEnd(reference.textSpan) !== range.end) {
-                        _this.raiseError("Rename location results do not match.\n\nExpected: " + stringify(ranges) + "\n\nActual:" + stringify(references));
-                    }
-                });
-            };
-            var this_3 = this;
-            for (var _i = 0, _a = toArray(startRanges); _i < _a.length; _i++) {
-                var startRange = _a[_i];
-                var state_1 = _loop_7(startRange);
-                if (typeof state_1 === "object")
-                    return state_1.value;
-                if (state_1 === "break")
-                    break;
-            }
-        };
-        TestState.prototype.verifyQuickInfoExists = function (negative) {
-            var actualQuickInfo = this.languageService.getQuickInfoAtPosition(this.activeFile.fileName, this.currentCaretPosition);
-            if (negative) {
-                if (actualQuickInfo) {
-                    this.raiseError("verifyQuickInfoExists failed. Expected quick info NOT to exist");
-                }
-            }
-            else {
-                if (!actualQuickInfo) {
-                    this.raiseError("verifyQuickInfoExists failed. Expected quick info to exist");
-                }
-            }
-        };
-        TestState.prototype.verifyNoSignatureHelp = function (markers) {
-            if (markers.length) {
-                for (var _i = 0, markers_1 = markers; _i < markers_1.length; _i++) {
-                    var marker = markers_1[_i];
-                    this.goToMarker(marker);
-                    this.verifyNoSignatureHelp(ts.emptyArray);
-                }
-                return;
-            }
-            var actual = this.getSignatureHelp();
-            if (actual) {
-                this.raiseError("Expected no signature help, but got \"" + stringify(actual) + "\"");
-            }
-        };
-        TestState.prototype.verifySignatureHelp = function (optionses) {
-            for (var _i = 0, optionses_1 = optionses; _i < optionses_1.length; _i++) {
-                var options = optionses_1[_i];
-                if (options.marker === undefined) {
-                    this.verifySignatureHelpWorker(options);
-                }
-                else {
-                    for (var _a = 0, _b = toArray(options.marker); _a < _b.length; _a++) {
-                        var marker = _b[_a];
-                        this.goToMarker(marker);
-                        this.verifySignatureHelpWorker(options);
-                    }
-                }
-            }
-        };
-        TestState.prototype.verifySignatureHelpWorker = function (options) {
-            var _this = this;
-            var help = this.getSignatureHelp();
-            var selectedItem = help.items[help.selectedItemIndex];
-            // Argument index may exceed number of parameters
-            var currentParameter = selectedItem.parameters[help.argumentIndex];
-            assert.equal(help.items.length, options.overloadsCount || 1, this.assertionMessageAtLastKnownMarker("signature help overloads count"));
-            assert.equal(ts.displayPartsToString(selectedItem.documentation), options.docComment || "", this.assertionMessageAtLastKnownMarker("current signature help doc comment"));
-            if (options.text !== undefined) {
-                assert.equal(ts.displayPartsToString(selectedItem.prefixDisplayParts) +
-                    selectedItem.parameters.map(function (p) { return ts.displayPartsToString(p.displayParts); }).join(ts.displayPartsToString(selectedItem.separatorDisplayParts)) +
-                    ts.displayPartsToString(selectedItem.suffixDisplayParts), options.text);
-            }
-            if (options.parameterName !== undefined) {
-                assert.equal(currentParameter.name, options.parameterName);
-            }
-            if (options.parameterSpan !== undefined) {
-                assert.equal(ts.displayPartsToString(currentParameter.displayParts), options.parameterSpan);
-            }
-            if (currentParameter) {
-                assert.equal(ts.displayPartsToString(currentParameter.documentation), options.parameterDocComment || "", this.assertionMessageAtLastKnownMarker("current parameter Help DocComment"));
-            }
-            if (options.parameterCount !== undefined) {
-                assert.equal(selectedItem.parameters.length, options.parameterCount);
-            }
-            if (options.argumentCount !== undefined) {
-                assert.equal(help.argumentCount, options.argumentCount);
-            }
-            assert.equal(selectedItem.isVariadic, !!options.isVariadic);
-            var actualTags = selectedItem.tags;
-            assert.equal(actualTags.length, (options.tags || ts.emptyArray).length, this.assertionMessageAtLastKnownMarker("signature help tags"));
-            ts.zipWith((options.tags || ts.emptyArray), actualTags, function (expectedTag, actualTag) {
-                assert.equal(expectedTag.name, actualTag.name);
-                assert.equal(expectedTag.text, actualTag.text, _this.assertionMessageAtLastKnownMarker("signature help tag " + actualTag.name));
-            });
-            var allKeys = [
-                "marker",
-                "overloadsCount",
-                "docComment",
-                "text",
-                "parameterName",
-                "parameterSpan",
-                "parameterDocComment",
-                "parameterCount",
-                "isVariadic",
-                "tags",
-                "argumentCount",
-            ];
-            for (var key in options) {
-                ts.Debug.assert(ts.contains(allKeys, key));
-            }
-        };
-        TestState.prototype.validate = function (name, expected, actual) {
-            if (expected && expected !== actual) {
-                this.raiseError("Expected " + name + " '" + expected + "'.  Got '" + actual + "' instead.");
-            }
-        };
-        TestState.prototype.verifyRenameInfoSucceeded = function (displayName, fullDisplayName, kind, kindModifiers) {
-            var renameInfo = this.languageService.getRenameInfo(this.activeFile.fileName, this.currentCaretPosition);
-            if (!renameInfo.canRename) {
-                this.raiseError("Rename did not succeed");
-            }
-            this.validate("displayName", displayName, renameInfo.displayName);
-            this.validate("fullDisplayName", fullDisplayName, renameInfo.fullDisplayName);
-            this.validate("kind", kind, renameInfo.kind);
-            this.validate("kindModifiers", kindModifiers, renameInfo.kindModifiers);
-            if (this.getRanges().length !== 1) {
-                this.raiseError("Expected a single range to be selected in the test file.");
-            }
-            var expectedRange = this.getRanges()[0];
-            if (renameInfo.triggerSpan.start !== expectedRange.pos ||
-                ts.textSpanEnd(renameInfo.triggerSpan) !== expectedRange.end) {
-                this.raiseError("Expected triggerSpan [" + expectedRange.pos + "," + expectedRange.end + ").  Got [" +
-                    renameInfo.triggerSpan.start + "," + ts.textSpanEnd(renameInfo.triggerSpan) + ") instead.");
-            }
-        };
-        TestState.prototype.verifyRenameInfoFailed = function (message) {
-            var renameInfo = this.languageService.getRenameInfo(this.activeFile.fileName, this.currentCaretPosition);
-            if (renameInfo.canRename) {
-                this.raiseError("Rename was expected to fail");
-            }
-            this.validate("error", message, renameInfo.localizedErrorMessage);
-        };
-        TestState.prototype.spanInfoToString = function (spanInfo, prefixString) {
-            var resultString = "SpanInfo: " + JSON.stringify(spanInfo);
-            if (spanInfo) {
-                var spanString = this.activeFile.content.substr(spanInfo.start, spanInfo.length);
-                var spanLineMap = ts.computeLineStarts(spanString);
-                for (var i = 0; i < spanLineMap.length; i++) {
-                    if (!i) {
-                        resultString += "\n";
-                    }
-                    resultString += prefixString + spanString.substring(spanLineMap[i], spanLineMap[i + 1]);
-                }
-                resultString += "\n" + prefixString + ":=> (" + this.getLineColStringAtPosition(spanInfo.start) + ") to (" + this.getLineColStringAtPosition(ts.textSpanEnd(spanInfo)) + ")";
-            }
-            return resultString;
-        };
-        TestState.prototype.baselineCurrentFileLocations = function (getSpanAtPos) {
-            var _this = this;
-            var fileLineMap = ts.computeLineStarts(this.activeFile.content);
-            var nextLine = 0;
-            var resultString = "";
-            var currentLine;
-            var previousSpanInfo;
-            var startColumn;
-            var length;
-            var prefixString = "    >";
-            var pos = 0;
-            var addSpanInfoString = function () {
-                if (previousSpanInfo) {
-                    resultString += currentLine;
-                    var thisLineMarker = ts.repeatString(" ", startColumn) + ts.repeatString("~", length);
-                    thisLineMarker += ts.repeatString(" ", _this.alignmentForExtraInfo - thisLineMarker.length - prefixString.length + 1);
-                    resultString += thisLineMarker;
-                    resultString += "=> Pos: (" + (pos - length) + " to " + (pos - 1) + ") ";
-                    resultString += " " + previousSpanInfo;
-                    previousSpanInfo = undefined;
-                }
-            };
-            for (; pos < this.activeFile.content.length; pos++) {
-                if (pos === 0 || pos === fileLineMap[nextLine]) {
-                    nextLine++;
-                    addSpanInfoString();
-                    if (resultString.length) {
-                        resultString += "\n--------------------------------";
-                    }
-                    currentLine = "\n" + nextLine.toString() + ts.repeatString(" ", 3 - nextLine.toString().length) + ">" + this.activeFile.content.substring(pos, fileLineMap[nextLine]) + "\n    ";
-                    startColumn = 0;
-                    length = 0;
-                }
-                var spanInfo = this.spanInfoToString(getSpanAtPos(pos), prefixString);
-                if (previousSpanInfo && previousSpanInfo !== spanInfo) {
-                    addSpanInfoString();
-                    previousSpanInfo = spanInfo;
-                    startColumn = startColumn + length;
-                    length = 1;
-                }
-                else {
-                    previousSpanInfo = spanInfo;
-                    length++;
-                }
-            }
-            addSpanInfoString();
-            return resultString;
-        };
-        TestState.prototype.getBreakpointStatementLocation = function (pos) {
-            return this.languageService.getBreakpointStatementAtPosition(this.activeFile.fileName, pos);
-        };
-        TestState.prototype.baselineCurrentFileBreakpointLocations = function () {
-            var _this = this;
-            var baselineFile = this.testData.globalOptions["BaselineFile" /* baselineFile */];
-            if (!baselineFile) {
-                baselineFile = this.activeFile.fileName.replace(this.basePath + "/breakpointValidation", "bpSpan");
-                baselineFile = baselineFile.replace(".ts" /* Ts */, ".baseline");
-            }
-            Harness.Baseline.runBaseline(baselineFile, function () {
-                return _this.baselineCurrentFileLocations(function (pos) { return _this.getBreakpointStatementLocation(pos); });
-            });
-        };
-        TestState.prototype.baselineGetEmitOutput = function (insertResultsIntoVfs) {
-            var _this = this;
-            // Find file to be emitted
-            var emitFiles = []; // List of FourSlashFile that has emitThisFile flag on
-            var allFourSlashFiles = this.testData.files;
-            for (var _i = 0, allFourSlashFiles_1 = allFourSlashFiles; _i < allFourSlashFiles_1.length; _i++) {
-                var file = allFourSlashFiles_1[_i];
-                if (file.fileOptions["emitThisFile" /* emitThisFile */] === "true") {
-                    // Find a file with the flag emitThisFile turned on
-                    emitFiles.push(file);
-                }
-            }
-            // If there is not emiThisFile flag specified in the test file, throw an error
-            if (emitFiles.length === 0) {
-                this.raiseError("No emitThisFile is specified in the test file");
-            }
-            Harness.Baseline.runBaseline(this.testData.globalOptions["BaselineFile" /* baselineFile */], function () {
-                var resultString = "";
-                // Loop through all the emittedFiles and emit them one by one
-                emitFiles.forEach(function (emitFile) {
-                    var emitOutput = _this.languageService.getEmitOutput(emitFile.fileName);
-                    // Print emitOutputStatus in readable format
-                    resultString += "EmitSkipped: " + emitOutput.emitSkipped + Harness.IO.newLine();
-                    if (emitOutput.emitSkipped) {
-                        resultString += "Diagnostics:" + Harness.IO.newLine();
-                        var diagnostics = ts.getPreEmitDiagnostics(_this.languageService.getProgram()); // TODO: GH#18217
-                        for (var _i = 0, diagnostics_1 = diagnostics; _i < diagnostics_1.length; _i++) {
-                            var diagnostic = diagnostics_1[_i];
-                            if (!ts.isString(diagnostic.messageText)) {
-                                var chainedMessage = diagnostic.messageText;
-                                var indentation = " ";
-                                while (chainedMessage) {
-                                    resultString += indentation + chainedMessage.messageText + Harness.IO.newLine();
-                                    chainedMessage = chainedMessage.next;
-                                    indentation = indentation + " ";
-                                }
-                            }
-                            else {
-                                resultString += "  " + diagnostic.messageText + Harness.IO.newLine();
-                            }
-                        }
-                    }
-                    for (var _a = 0, _b = emitOutput.outputFiles; _a < _b.length; _a++) {
-                        var outputFile = _b[_a];
-                        var fileName = "FileName : " + outputFile.name + Harness.IO.newLine();
-                        resultString = resultString + fileName + outputFile.text;
-                        if (insertResultsIntoVfs) {
-                            _this.languageServiceAdapterHost.addScript(ts.getNormalizedAbsolutePath(outputFile.name, "/"), outputFile.text, /*isRootFile*/ true);
-                        }
-                    }
-                    resultString += Harness.IO.newLine();
-                });
-                return resultString;
-            });
-        };
-        TestState.prototype.baselineQuickInfo = function () {
-            var _this = this;
-            var baselineFile = this.testData.globalOptions["BaselineFile" /* baselineFile */];
-            if (!baselineFile) {
-                baselineFile = ts.getBaseFileName(this.activeFile.fileName).replace(".ts" /* Ts */, ".baseline");
-            }
-            Harness.Baseline.runBaseline(baselineFile, function () { return stringify(_this.testData.markers.map(function (marker) { return ({
-                marker: marker,
-                quickInfo: _this.languageService.getQuickInfoAtPosition(marker.fileName, marker.position)
-            }); })); });
-        };
-        TestState.prototype.printBreakpointLocation = function (pos) {
-            Harness.IO.log("\n**Pos: " + pos + " " + this.spanInfoToString(this.getBreakpointStatementLocation(pos), "  "));
-        };
-        TestState.prototype.printBreakpointAtCurrentLocation = function () {
-            this.printBreakpointLocation(this.currentCaretPosition);
-        };
-        TestState.prototype.printCurrentParameterHelp = function () {
-            var help = this.languageService.getSignatureHelpItems(this.activeFile.fileName, this.currentCaretPosition);
-            Harness.IO.log(stringify(help));
-        };
-        TestState.prototype.printCurrentQuickInfo = function () {
-            var quickInfo = this.languageService.getQuickInfoAtPosition(this.activeFile.fileName, this.currentCaretPosition);
-            Harness.IO.log("Quick Info: " + quickInfo.displayParts.map(function (part) { return part.text; }).join(""));
-        };
-        TestState.prototype.printErrorList = function () {
-            var syntacticErrors = this.languageService.getSyntacticDiagnostics(this.activeFile.fileName);
-            var semanticErrors = this.languageService.getSemanticDiagnostics(this.activeFile.fileName);
-            var errorList = ts.concatenate(syntacticErrors, semanticErrors);
-            Harness.IO.log("Error list (" + errorList.length + " errors)");
-            if (errorList.length) {
-                errorList.forEach(function (err) {
-                    Harness.IO.log("start: " + err.start +
-                        ", length: " + err.length +
-                        ", message: " + ts.flattenDiagnosticMessageText(err.messageText, Harness.IO.newLine()));
-                });
-            }
-        };
-        TestState.prototype.printCurrentFileState = function (showWhitespace, makeCaretVisible) {
-            for (var _i = 0, _a = this.testData.files; _i < _a.length; _i++) {
-                var file = _a[_i];
-                var active = (this.activeFile === file);
-                Harness.IO.log("=== Script (" + file.fileName + ") " + (active ? "(active, cursor at |)" : "") + " ===");
-                var content = this.getFileContent(file.fileName);
-                if (active) {
-                    content = content.substr(0, this.currentCaretPosition) + (makeCaretVisible ? "|" : "") + content.substr(this.currentCaretPosition);
-                }
-                if (showWhitespace) {
-                    content = makeWhitespaceVisible(content);
-                }
-                Harness.IO.log(content);
-            }
-        };
-        TestState.prototype.printCurrentSignatureHelp = function () {
-            var help = this.getSignatureHelp();
-            Harness.IO.log(stringify(help.items[help.selectedItemIndex]));
-        };
-        TestState.prototype.getSignatureHelp = function () {
-            return this.languageService.getSignatureHelpItems(this.activeFile.fileName, this.currentCaretPosition);
-        };
-        TestState.prototype.printCompletionListMembers = function (preferences) {
-            var completions = this.getCompletionListAtCaret(preferences);
-            this.printMembersOrCompletions(completions);
-        };
-        TestState.prototype.printMembersOrCompletions = function (info) {
-            if (info === undefined) {
-                return "No completion info.";
-            }
-            var entries = info.entries;
-            function pad(s, length) {
-                return s + new Array(length - s.length + 1).join(" ");
-            }
-            function max(arr, selector) {
-                return arr.reduce(function (prev, x) { return Math.max(prev, selector(x)); }, 0);
-            }
-            var longestNameLength = max(entries, function (m) { return m.name.length; });
-            var longestKindLength = max(entries, function (m) { return m.kind.length; });
-            entries.sort(function (m, n) { return m.sortText > n.sortText ? 1 : m.sortText < n.sortText ? -1 : m.name > n.name ? 1 : m.name < n.name ? -1 : 0; });
-            var membersString = entries.map(function (m) { return pad(m.name, longestNameLength) + " " + pad(m.kind, longestKindLength) + " " + m.kindModifiers + " " + (m.isRecommended ? "recommended " : "") + (m.source === undefined ? "" : m.source); }).join("\n");
-            Harness.IO.log(membersString);
-        };
-        TestState.prototype.printContext = function () {
-            ts.forEach(this.languageServiceAdapterHost.getFilenames(), Harness.IO.log);
-        };
-        TestState.prototype.deleteChar = function (count) {
-            if (count === void 0) { count = 1; }
-            var offset = this.currentCaretPosition;
-            var ch = "";
-            var checkCadence = (count >> 2) + 1;
-            for (var i = 0; i < count; i++) {
-                this.editScriptAndUpdateMarkers(this.activeFile.fileName, offset, offset + 1, ch);
-                if (i % checkCadence === 0) {
-                    this.checkPostEditInvariants();
-                }
-                // Handle post-keystroke formatting
-                if (this.enableFormatting) {
-                    var edits = this.languageService.getFormattingEditsAfterKeystroke(this.activeFile.fileName, offset, ch, this.formatCodeSettings);
-                    if (edits.length) {
-                        offset += this.applyEdits(this.activeFile.fileName, edits, /*isFormattingEdit*/ true);
-                    }
-                }
-            }
-            this.checkPostEditInvariants();
-        };
-        TestState.prototype.replace = function (start, length, text) {
-            this.editScriptAndUpdateMarkers(this.activeFile.fileName, start, start + length, text);
-            this.checkPostEditInvariants();
-        };
-        TestState.prototype.deleteCharBehindMarker = function (count) {
-            if (count === void 0) { count = 1; }
-            var offset = this.currentCaretPosition;
-            var ch = "";
-            var checkCadence = (count >> 2) + 1;
-            for (var i = 0; i < count; i++) {
-                this.currentCaretPosition--;
-                offset--;
-                this.editScriptAndUpdateMarkers(this.activeFile.fileName, offset, offset + 1, ch);
-                if (i % checkCadence === 0) {
-                    this.checkPostEditInvariants();
-                }
-                // Don't need to examine formatting because there are no formatting changes on backspace.
-            }
-            this.checkPostEditInvariants();
-        };
-        // Enters lines of text at the current caret position
-        TestState.prototype.type = function (text, highFidelity) {
-            if (highFidelity === void 0) { highFidelity = false; }
-            var offset = this.currentCaretPosition;
-            var prevChar = " ";
-            var checkCadence = (text.length >> 2) + 1;
-            for (var i = 0; i < text.length; i++) {
-                var ch = text.charAt(i);
-                this.editScriptAndUpdateMarkers(this.activeFile.fileName, offset, offset, ch);
-                if (highFidelity) {
-                    this.languageService.getBraceMatchingAtPosition(this.activeFile.fileName, offset);
-                }
-                this.currentCaretPosition++;
-                offset++;
-                if (highFidelity) {
-                    if (ch === "(" || ch === ",") {
-                        /* Signature help*/
-                        this.languageService.getSignatureHelpItems(this.activeFile.fileName, offset);
-                    }
-                    else if (prevChar === " " && /A-Za-z_/.test(ch)) {
-                        /* Completions */
-                        this.languageService.getCompletionsAtPosition(this.activeFile.fileName, offset, ts.defaultPreferences);
-                    }
-                    if (i % checkCadence === 0) {
-                        this.checkPostEditInvariants();
-                    }
-                }
-                // Handle post-keystroke formatting
-                if (this.enableFormatting) {
-                    var edits = this.languageService.getFormattingEditsAfterKeystroke(this.activeFile.fileName, offset, ch, this.formatCodeSettings);
-                    if (edits.length) {
-                        offset += this.applyEdits(this.activeFile.fileName, edits, /*isFormattingEdit*/ true);
-                    }
-                }
-            }
-            this.checkPostEditInvariants();
-        };
-        // Enters text as if the user had pasted it
-        TestState.prototype.paste = function (text) {
-            var start = this.currentCaretPosition;
-            this.editScriptAndUpdateMarkers(this.activeFile.fileName, this.currentCaretPosition, this.currentCaretPosition, text);
-            this.checkPostEditInvariants();
-            var offset = this.currentCaretPosition += text.length;
-            // Handle formatting
-            if (this.enableFormatting) {
-                var edits = this.languageService.getFormattingEditsForRange(this.activeFile.fileName, start, offset, this.formatCodeSettings);
-                if (edits.length) {
-                    this.applyEdits(this.activeFile.fileName, edits, /*isFormattingEdit*/ true);
-                }
-            }
-            this.checkPostEditInvariants();
-        };
-        TestState.prototype.checkPostEditInvariants = function () {
-            if (this.testType !== 0 /* Native */) {
-                // getSourcefile() results can not be serialized. Only perform these verifications
-                // if running against a native LS object.
-                return;
-            }
-            var incrementalSourceFile = this.languageService.getNonBoundSourceFile(this.activeFile.fileName);
-            Utils.assertInvariants(incrementalSourceFile, /*parent:*/ undefined);
-            var incrementalSyntaxDiagnostics = incrementalSourceFile.parseDiagnostics;
-            // Check syntactic structure
-            var content = this.getFileContent(this.activeFile.fileName);
-            var referenceSourceFile = ts.createLanguageServiceSourceFile(this.activeFile.fileName, createScriptSnapShot(content), 6 /* Latest */, /*version:*/ "0", /*setNodeParents:*/ false);
-            var referenceSyntaxDiagnostics = referenceSourceFile.parseDiagnostics;
-            Utils.assertDiagnosticsEquals(incrementalSyntaxDiagnostics, referenceSyntaxDiagnostics);
-            Utils.assertStructuralEquals(incrementalSourceFile, referenceSourceFile);
-        };
-        /**
-         * @returns The number of characters added to the file as a result of the edits.
-         * May be negative.
-         */
-        TestState.prototype.applyEdits = function (fileName, edits, isFormattingEdit) {
-            // We get back a set of edits, but langSvc.editScript only accepts one at a time. Use this to keep track
-            // of the incremental offset from each edit to the next. We assume these edit ranges don't overlap
-            // Copy this so we don't ruin someone else's copy
-            edits = JSON.parse(JSON.stringify(edits));
-            // Get a snapshot of the content of the file so we can make sure any formatting edits didn't destroy non-whitespace characters
-            var oldContent = this.getFileContent(fileName);
-            var runningOffset = 0;
-            for (var i = 0; i < edits.length; i++) {
-                var edit = edits[i];
-                var offsetStart = edit.span.start;
-                var offsetEnd = offsetStart + edit.span.length;
-                this.editScriptAndUpdateMarkers(fileName, offsetStart, offsetEnd, edit.newText);
-                var editDelta = edit.newText.length - edit.span.length;
-                if (offsetStart <= this.currentCaretPosition) {
-                    if (offsetEnd <= this.currentCaretPosition) {
-                        // The entirety of the edit span falls before the caret position, shift the caret accordingly
-                        this.currentCaretPosition += editDelta;
-                    }
-                    else {
-                        // The span being replaced includes the caret position, place the caret at the beginning of the span
-                        this.currentCaretPosition = offsetStart;
-                    }
-                }
-                runningOffset += editDelta;
-                // Update positions of any future edits affected by this change
-                for (var j = i + 1; j < edits.length; j++) {
-                    if (edits[j].span.start >= edits[i].span.start) {
-                        edits[j].span.start += editDelta;
-                    }
-                }
-            }
-            if (isFormattingEdit) {
-                var newContent = this.getFileContent(fileName);
-                if (this.removeWhitespace(newContent) !== this.removeWhitespace(oldContent)) {
-                    this.raiseError("Formatting operation destroyed non-whitespace content");
-                }
-            }
-            return runningOffset;
-        };
-        TestState.prototype.copyFormatOptions = function () {
-            return ts.clone(this.formatCodeSettings);
-        };
-        TestState.prototype.setFormatOptions = function (formatCodeOptions) {
-            var oldFormatCodeOptions = this.formatCodeSettings;
-            this.formatCodeSettings = ts.toEditorSettings(formatCodeOptions);
-            return oldFormatCodeOptions;
-        };
-        TestState.prototype.formatDocument = function () {
-            var edits = this.languageService.getFormattingEditsForDocument(this.activeFile.fileName, this.formatCodeSettings);
-            this.applyEdits(this.activeFile.fileName, edits, /*isFormattingEdit*/ true);
-        };
-        TestState.prototype.formatSelection = function (start, end) {
-            var edits = this.languageService.getFormattingEditsForRange(this.activeFile.fileName, start, end, this.formatCodeSettings);
-            this.applyEdits(this.activeFile.fileName, edits, /*isFormattingEdit*/ true);
-        };
-        TestState.prototype.formatOnType = function (pos, key) {
-            var edits = this.languageService.getFormattingEditsAfterKeystroke(this.activeFile.fileName, pos, key, this.formatCodeSettings);
-            this.applyEdits(this.activeFile.fileName, edits, /*isFormattingEdit*/ true);
-        };
-        TestState.prototype.editScriptAndUpdateMarkers = function (fileName, editStart, editEnd, newText) {
-            this.languageServiceAdapterHost.editScript(fileName, editStart, editEnd, newText);
-            for (var _i = 0, _a = this.testData.markers; _i < _a.length; _i++) {
-                var marker = _a[_i];
-                if (marker.fileName === fileName) {
-                    marker.position = updatePosition(marker.position);
-                }
-            }
-            for (var _b = 0, _c = this.testData.ranges; _b < _c.length; _b++) {
-                var range = _c[_b];
-                if (range.fileName === fileName) {
-                    range.pos = updatePosition(range.pos);
-                    range.end = updatePosition(range.end);
-                }
-            }
-            function updatePosition(position) {
-                if (position > editStart) {
-                    if (position < editEnd) {
-                        // Inside the edit - mark it as invalidated (?)
-                        return -1;
-                    }
-                    else {
-                        // Move marker back/forward by the appropriate amount
-                        return position + (editStart - editEnd) + newText.length;
-                    }
-                }
-                else {
-                    return position;
-                }
-            }
-        };
-        TestState.prototype.removeWhitespace = function (text) {
-            return text.replace(/\s/g, "");
-        };
-        TestState.prototype.goToBOF = function () {
-            this.goToPosition(0);
-        };
-        TestState.prototype.goToEOF = function () {
-            var len = this.getFileContent(this.activeFile.fileName).length;
-            this.goToPosition(len);
-        };
-        TestState.prototype.goToRangeStart = function (_a) {
-            var fileName = _a.fileName, pos = _a.pos;
-            this.openFile(fileName);
-            this.goToPosition(pos);
-        };
-        TestState.prototype.goToTypeDefinition = function (definitionIndex) {
-            var definitions = this.languageService.getTypeDefinitionAtPosition(this.activeFile.fileName, this.currentCaretPosition);
-            if (!definitions || !definitions.length) {
-                this.raiseError("goToTypeDefinition failed - expected to find at least one definition location but got 0");
-            }
-            if (definitionIndex >= definitions.length) {
-                this.raiseError("goToTypeDefinition failed - definitionIndex value (" + definitionIndex + ") exceeds definition list size (" + definitions.length + ")");
-            }
-            var definition = definitions[definitionIndex];
-            this.openFile(definition.fileName);
-            this.currentCaretPosition = definition.textSpan.start;
-        };
-        TestState.prototype.verifyTypeDefinitionsCount = function (negative, expectedCount) {
-            var assertFn = negative ? assert.notEqual : assert.equal;
-            var definitions = this.languageService.getTypeDefinitionAtPosition(this.activeFile.fileName, this.currentCaretPosition);
-            var actualCount = definitions && definitions.length || 0;
-            assertFn(actualCount, expectedCount, this.messageAtLastKnownMarker("Type definitions Count"));
-        };
-        TestState.prototype.verifyImplementationListIsEmpty = function (negative) {
-            var implementations = this.languageService.getImplementationAtPosition(this.activeFile.fileName, this.currentCaretPosition);
-            if (negative) {
-                assert.isTrue(implementations && implementations.length > 0, "Expected at least one implementation but got 0");
-            }
-            else {
-                assert.isUndefined(implementations, "Expected implementation list to be empty but implementations returned");
-            }
-        };
-        TestState.prototype.verifyGoToDefinitionName = function (expectedName, expectedContainerName) {
-            var definitions = this.languageService.getDefinitionAtPosition(this.activeFile.fileName, this.currentCaretPosition);
-            var actualDefinitionName = definitions && definitions.length ? definitions[0].name : "";
-            var actualDefinitionContainerName = definitions && definitions.length ? definitions[0].containerName : "";
-            assert.equal(actualDefinitionName, expectedName, this.messageAtLastKnownMarker("Definition Info Name"));
-            assert.equal(actualDefinitionContainerName, expectedContainerName, this.messageAtLastKnownMarker("Definition Info Container Name"));
-        };
-        TestState.prototype.goToImplementation = function () {
-            var implementations = this.languageService.getImplementationAtPosition(this.activeFile.fileName, this.currentCaretPosition);
-            if (!implementations || !implementations.length) {
-                this.raiseError("goToImplementation failed - expected to find at least one implementation location but got 0");
-            }
-            if (implementations.length > 1) {
-                this.raiseError("goToImplementation failed - more than 1 implementation returned (" + implementations.length + ")");
-            }
-            var implementation = implementations[0];
-            this.openFile(implementation.fileName);
-            this.currentCaretPosition = implementation.textSpan.start;
-        };
-        TestState.prototype.verifyRangesInImplementationList = function (markerName) {
-            this.goToMarker(markerName);
-            var implementations = this.languageService.getImplementationAtPosition(this.activeFile.fileName, this.currentCaretPosition);
-            if (!implementations || !implementations.length) {
-                this.raiseError("verifyRangesInImplementationList failed - expected to find at least one implementation location but got 0");
-            }
-            var duplicate = findDuplicatedElement(implementations, implementationsAreEqual);
-            if (duplicate) {
-                var textSpan = duplicate.textSpan, fileName = duplicate.fileName;
-                var end = textSpan.start + textSpan.length;
-                this.raiseError("Duplicate implementations returned for range (" + textSpan.start + ", " + end + ") in " + fileName);
-            }
-            var ranges = this.getRanges();
-            if (!ranges || !ranges.length) {
-                this.raiseError("verifyRangesInImplementationList failed - expected to find at least one range in test source");
-            }
-            var unsatisfiedRanges = [];
-            var delayedErrors = [];
-            var _loop_8 = function (range) {
-                var length = range.end - range.pos;
-                var matchingImpl = ts.find(implementations, function (impl) {
-                    return range.fileName === impl.fileName && range.pos === impl.textSpan.start && length === impl.textSpan.length;
-                });
-                if (matchingImpl) {
-                    if (range.marker && range.marker.data) {
-                        var expected = range.marker.data;
-                        if (expected.displayParts) {
-                            if (!ts.arrayIsEqualTo(expected.displayParts, matchingImpl.displayParts, displayPartIsEqualTo)) {
-                                delayedErrors.push("Mismatched display parts: expected " + JSON.stringify(expected.displayParts) + ", actual " + JSON.stringify(matchingImpl.displayParts));
-                            }
-                        }
-                        else if (expected.parts) {
-                            var actualParts = matchingImpl.displayParts.map(function (p) { return p.text; });
-                            if (!ts.arrayIsEqualTo(expected.parts, actualParts)) {
-                                delayedErrors.push("Mismatched non-tagged display parts: expected " + JSON.stringify(expected.parts) + ", actual " + JSON.stringify(actualParts));
-                            }
-                        }
-                        if (expected.kind !== undefined) {
-                            if (expected.kind !== matchingImpl.kind) {
-                                delayedErrors.push("Mismatched kind: expected " + JSON.stringify(expected.kind) + ", actual " + JSON.stringify(matchingImpl.kind));
-                            }
-                        }
-                    }
-                    matchingImpl.matched = true;
-                }
-                else {
-                    unsatisfiedRanges.push(range);
-                }
-            };
-            for (var _i = 0, ranges_2 = ranges; _i < ranges_2.length; _i++) {
-                var range = ranges_2[_i];
-                _loop_8(range);
-            }
-            if (delayedErrors.length) {
-                this.raiseError(delayedErrors.join("\n"));
-            }
-            var unmatchedImplementations = implementations.filter(function (impl) { return !impl.matched; });
-            if (unmatchedImplementations.length || unsatisfiedRanges.length) {
-                var error = "Not all ranges or implementations are satisfied";
-                if (unsatisfiedRanges.length) {
-                    error += "\nUnsatisfied ranges:";
-                    for (var _a = 0, unsatisfiedRanges_1 = unsatisfiedRanges; _a < unsatisfiedRanges_1.length; _a++) {
-                        var range = unsatisfiedRanges_1[_a];
-                        error += "\n    (" + range.pos + ", " + range.end + ") in " + range.fileName + ": " + this.rangeText(range);
-                    }
-                }
-                if (unmatchedImplementations.length) {
-                    error += "\nUnmatched implementations:";
-                    for (var _b = 0, unmatchedImplementations_1 = unmatchedImplementations; _b < unmatchedImplementations_1.length; _b++) {
-                        var impl = unmatchedImplementations_1[_b];
-                        var end = impl.textSpan.start + impl.textSpan.length;
-                        error += "\n    (" + impl.textSpan.start + ", " + end + ") in " + impl.fileName + ": " + this.getFileContent(impl.fileName).slice(impl.textSpan.start, end);
-                    }
-                }
-                this.raiseError(error);
-            }
-            function implementationsAreEqual(a, b) {
-                return a.fileName === b.fileName && TestState.textSpansEqual(a.textSpan, b.textSpan);
-            }
-            function displayPartIsEqualTo(a, b) {
-                return a.kind === b.kind && a.text === b.text;
-            }
-        };
-        TestState.prototype.getMarkers = function () {
-            //  Return a copy of the list
-            return this.testData.markers.slice(0);
-        };
-        TestState.prototype.getMarkerNames = function () {
-            return ts.arrayFrom(this.testData.markerPositions.keys());
-        };
-        TestState.prototype.getRanges = function () {
-            return this.testData.ranges;
-        };
-        TestState.prototype.rangesByText = function () {
-            var result = ts.createMultiMap();
-            for (var _i = 0, _a = this.getRanges(); _i < _a.length; _i++) {
-                var range = _a[_i];
-                var text = this.rangeText(range);
-                result.add(text, range);
-            }
-            return result;
-        };
-        TestState.prototype.rangeText = function (_a) {
-            var fileName = _a.fileName, pos = _a.pos, end = _a.end;
-            return this.getFileContent(fileName).slice(pos, end);
-        };
-        TestState.prototype.verifyCaretAtMarker = function (markerName) {
-            if (markerName === void 0) { markerName = ""; }
-            var pos = this.getMarkerByName(markerName);
-            if (pos.fileName !== this.activeFile.fileName) {
-                throw new Error("verifyCaretAtMarker failed - expected to be in file \"" + pos.fileName + "\", but was in file \"" + this.activeFile.fileName + "\"");
-            }
-            if (pos.position !== this.currentCaretPosition) {
-                throw new Error("verifyCaretAtMarker failed - expected to be at marker \"/*" + markerName + "*/, but was at position " + this.currentCaretPosition + "(" + this.getLineColStringAtPosition(this.currentCaretPosition) + ")");
-            }
-        };
-        TestState.prototype.getIndentation = function (fileName, position, indentStyle, baseIndentSize) {
-            var formatOptions = ts.clone(this.formatCodeSettings);
-            formatOptions.indentStyle = indentStyle;
-            formatOptions.baseIndentSize = baseIndentSize;
-            return this.languageService.getIndentationAtPosition(fileName, position, formatOptions);
-        };
-        TestState.prototype.verifyIndentationAtCurrentPosition = function (numberOfSpaces, indentStyle, baseIndentSize) {
-            if (indentStyle === void 0) { indentStyle = ts.IndentStyle.Smart; }
-            if (baseIndentSize === void 0) { baseIndentSize = 0; }
-            var actual = this.getIndentation(this.activeFile.fileName, this.currentCaretPosition, indentStyle, baseIndentSize);
-            var lineCol = this.getLineColStringAtPosition(this.currentCaretPosition);
-            if (actual !== numberOfSpaces) {
-                this.raiseError("verifyIndentationAtCurrentPosition failed at " + lineCol + " - expected: " + numberOfSpaces + ", actual: " + actual);
-            }
-        };
-        TestState.prototype.verifyIndentationAtPosition = function (fileName, position, numberOfSpaces, indentStyle, baseIndentSize) {
-            if (indentStyle === void 0) { indentStyle = ts.IndentStyle.Smart; }
-            if (baseIndentSize === void 0) { baseIndentSize = 0; }
-            var actual = this.getIndentation(fileName, position, indentStyle, baseIndentSize);
-            var lineCol = this.getLineColStringAtPosition(position);
-            if (actual !== numberOfSpaces) {
-                this.raiseError("verifyIndentationAtPosition failed at " + lineCol + " - expected: " + numberOfSpaces + ", actual: " + actual);
-            }
-        };
-        TestState.prototype.verifyCurrentLineContent = function (text) {
-            var actual = this.getCurrentLineContent();
-            if (actual !== text) {
-                throw new Error("verifyCurrentLineContent\n" +
-                    "\tExpected: \"" + text + "\"\n" +
-                    "\t  Actual: \"" + actual + "\"");
-            }
-        };
-        TestState.prototype.verifyCurrentFileContent = function (text) {
-            this.verifyFileContent(this.activeFile.fileName, text);
-        };
-        TestState.prototype.verifyFileContent = function (fileName, text) {
-            var actual = this.getFileContent(fileName);
-            if (actual !== text) {
-                throw new Error("verifyFileContent failed:\n" + showTextDiff(text, actual));
-            }
-        };
-        TestState.prototype.verifyTextAtCaretIs = function (text) {
-            var actual = this.getFileContent(this.activeFile.fileName).substring(this.currentCaretPosition, this.currentCaretPosition + text.length);
-            if (actual !== text) {
-                throw new Error("verifyTextAtCaretIs\n" +
-                    "\tExpected: \"" + text + "\"\n" +
-                    "\t  Actual: \"" + actual + "\"");
-            }
-        };
-        TestState.prototype.verifyCurrentNameOrDottedNameSpanText = function (text) {
-            var span = this.languageService.getNameOrDottedNameSpan(this.activeFile.fileName, this.currentCaretPosition, this.currentCaretPosition);
-            if (!span) {
-                return this.raiseError("verifyCurrentNameOrDottedNameSpanText\n" +
-                    "\tExpected: \"" + text + "\"\n" +
-                    "\t  Actual: undefined");
-            }
-            var actual = this.getFileContent(this.activeFile.fileName).substring(span.start, ts.textSpanEnd(span));
-            if (actual !== text) {
-                this.raiseError("verifyCurrentNameOrDottedNameSpanText\n" +
-                    "\tExpected: \"" + text + "\"\n" +
-                    "\t  Actual: \"" + actual + "\"");
-            }
-        };
-        TestState.prototype.getNameOrDottedNameSpan = function (pos) {
-            return this.languageService.getNameOrDottedNameSpan(this.activeFile.fileName, pos, pos);
-        };
-        TestState.prototype.baselineCurrentFileNameOrDottedNameSpans = function () {
-            var _this = this;
-            Harness.Baseline.runBaseline(this.testData.globalOptions["BaselineFile" /* baselineFile */], function () {
-                return _this.baselineCurrentFileLocations(function (pos) {
-                    return _this.getNameOrDottedNameSpan(pos);
-                });
-            });
-        };
-        TestState.prototype.printNameOrDottedNameSpans = function (pos) {
-            Harness.IO.log(this.spanInfoToString(this.getNameOrDottedNameSpan(pos), "**"));
-        };
-        TestState.prototype.verifyClassifications = function (expected, actual, sourceFileText) {
-            var _this = this;
-            if (actual.length !== expected.length) {
-                this.raiseError("verifyClassifications failed - expected total classifications to be " + expected.length +
-                    ", but was " + actual.length +
-                    jsonMismatchString());
-            }
-            ts.zipWith(expected, actual, function (expectedClassification, actualClassification) {
-                var expectedType = expectedClassification.classificationType;
-                if (expectedType !== actualClassification.classificationType) {
-                    _this.raiseError("verifyClassifications failed - expected classifications type to be " +
-                        expectedType + ", but was " +
-                        actualClassification.classificationType +
-                        jsonMismatchString());
-                }
-                var expectedSpan = expectedClassification.textSpan;
-                var actualSpan = actualClassification.textSpan;
-                if (expectedSpan) {
-                    var expectedLength = expectedSpan.end - expectedSpan.start;
-                    if (expectedSpan.start !== actualSpan.start || expectedLength !== actualSpan.length) {
-                        _this.raiseError("verifyClassifications failed - expected span of text to be " +
-                            "{start=" + expectedSpan.start + ", length=" + expectedLength + "}, but was " +
-                            "{start=" + actualSpan.start + ", length=" + actualSpan.length + "}" +
-                            jsonMismatchString());
-                    }
-                }
-                var actualText = _this.activeFile.content.substr(actualSpan.start, actualSpan.length);
-                if (expectedClassification.text !== actualText) {
-                    _this.raiseError("verifyClassifications failed - expected classified text to be " +
-                        expectedClassification.text + ", but was " +
-                        actualText +
-                        jsonMismatchString());
-                }
-            });
-            function jsonMismatchString() {
-                var showActual = actual.map(function (_a) {
-                    var classificationType = _a.classificationType, textSpan = _a.textSpan;
-                    return ({ classificationType: classificationType, text: sourceFileText.slice(textSpan.start, textSpan.start + textSpan.length) });
-                });
-                return Harness.IO.newLine() +
-                    "expected: '" + Harness.IO.newLine() + stringify(expected) + "'" + Harness.IO.newLine() +
-                    "actual:   '" + Harness.IO.newLine() + stringify(showActual) + "'";
-            }
-        };
-        TestState.prototype.verifyProjectInfo = function (expected) {
-            var _this = this;
-            if (this.testType === 3 /* Server */) {
-                var actual = this.languageService.getProjectInfo(this.activeFile.fileName, 
-                /* needFileNameList */ true);
-                assert.equal(expected.join(","), actual.fileNames.map(function (file) {
-                    return file.replace(_this.basePath + "/", "");
-                }).join(","));
-            }
-        };
-        TestState.prototype.verifySemanticClassifications = function (expected) {
-            var actual = this.languageService.getSemanticClassifications(this.activeFile.fileName, ts.createTextSpan(0, this.activeFile.content.length));
-            this.verifyClassifications(expected, actual, this.activeFile.content);
-        };
-        TestState.prototype.verifySyntacticClassifications = function (expected) {
-            var actual = this.languageService.getSyntacticClassifications(this.activeFile.fileName, ts.createTextSpan(0, this.activeFile.content.length));
-            this.verifyClassifications(expected, actual, this.activeFile.content);
-        };
-        TestState.prototype.printOutliningSpans = function () {
-            var spans = this.languageService.getOutliningSpans(this.activeFile.fileName);
-            Harness.IO.log("Outlining spans (" + spans.length + " items)");
-            Harness.IO.log(stringify(spans));
-        };
-        TestState.prototype.verifyOutliningSpans = function (spans, kind) {
-            var _this = this;
-            var actual = this.languageService.getOutliningSpans(this.activeFile.fileName);
-            if (actual.length !== spans.length) {
-                this.raiseError("verifyOutliningSpans failed - expected total spans to be " + spans.length + ", but was " + actual.length);
-            }
-            ts.zipWith(spans, actual, function (expectedSpan, actualSpan, i) {
-                if (expectedSpan.pos !== actualSpan.textSpan.start || expectedSpan.end !== ts.textSpanEnd(actualSpan.textSpan)) {
-                    return _this.raiseError("verifyOutliningSpans failed - span " + (i + 1) + " expected: (" + expectedSpan.pos + "," + expectedSpan.end + "),  actual: (" + actualSpan.textSpan.start + "," + ts.textSpanEnd(actualSpan.textSpan) + ")");
-                }
-                if (kind !== undefined && actualSpan.kind !== kind) {
-                    return _this.raiseError("verifyOutliningSpans failed - span " + (i + 1) + " expected kind: ('" + kind + "'),  actual: ('" + actualSpan.kind + "')");
-                }
-            });
-        };
-        TestState.prototype.verifyTodoComments = function (descriptors, spans) {
-            var _this = this;
-            var actual = this.languageService.getTodoComments(this.activeFile.fileName, descriptors.map(function (d) { return { text: d, priority: 0 }; }));
-            if (actual.length !== spans.length) {
-                this.raiseError("verifyTodoComments failed - expected total spans to be " + spans.length + ", but was " + actual.length);
-            }
-            ts.zipWith(spans, actual, function (expectedSpan, actualComment, i) {
-                var actualCommentSpan = ts.createTextSpan(actualComment.position, actualComment.message.length);
-                if (expectedSpan.pos !== actualCommentSpan.start || expectedSpan.end !== ts.textSpanEnd(actualCommentSpan)) {
-                    _this.raiseError("verifyOutliningSpans failed - span " + (i + 1) + " expected: (" + expectedSpan.pos + "," + expectedSpan.end + "),  actual: (" + actualCommentSpan.start + "," + ts.textSpanEnd(actualCommentSpan) + ")");
-                }
-            });
-        };
-        /**
-         * Finds and applies a code action corresponding to the supplied parameters.
-         * If index is undefined, applies the unique code action available.
-         * @param errorCode The error code that generated the code action.
-         * @param index The nth (0-index-based) codeaction available generated by errorCode.
-         */
-        TestState.prototype.getAndApplyCodeActions = function (errorCode, index) {
-            var fileName = this.activeFile.fileName;
-            this.applyCodeActions(this.getCodeFixes(fileName, errorCode), index);
-        };
-        TestState.prototype.applyCodeActionFromCompletion = function (markerName, options) {
-            this.goToMarker(markerName);
-            var details = this.getCompletionEntryDetails(options.name, options.source, options.preferences);
-            var codeActions = details.codeActions;
-            if (codeActions.length !== 1) {
-                this.raiseError("Expected one code action, got " + codeActions.length);
-            }
-            if (codeActions[0].description !== options.description) {
-                this.raiseError("Expected description to be:\n" + options.description + "\ngot:\n" + codeActions[0].description);
-            }
-            this.applyCodeActions(codeActions);
-            this.verifyNewContent(options, ts.flatMap(codeActions, function (a) { return a.changes.map(function (c) { return c.fileName; }); }));
-        };
-        TestState.prototype.verifyRangeIs = function (expectedText, includeWhiteSpace) {
-            var ranges = this.getRanges();
-            if (ranges.length !== 1) {
-                this.raiseError("Exactly one range should be specified in the testfile.");
-            }
-            var actualText = this.rangeText(ranges[0]);
-            var result = includeWhiteSpace
-                ? actualText === expectedText
-                : this.removeWhitespace(actualText) === this.removeWhitespace(expectedText);
-            if (!result) {
-                this.raiseError("Actual range text doesn't match expected text.\n" + showTextDiff(expectedText, actualText));
-            }
-        };
-        /**
-         * Compares expected text to the text that would be in the sole range
-         * (ie: [|...|]) in the file after applying the codefix sole codefix
-         * in the source file.
-         */
-        TestState.prototype.verifyRangeAfterCodeFix = function (expectedText, includeWhiteSpace, errorCode, index) {
-            this.getAndApplyCodeActions(errorCode, index);
-            this.verifyRangeIs(expectedText, includeWhiteSpace);
-        };
-        TestState.prototype.verifyCodeFixAll = function (_a) {
-            var _this = this;
-            var fixId = _a.fixId, fixAllDescription = _a.fixAllDescription, newFileContent = _a.newFileContent, expectedCommands = _a.commands;
-            var fixWithId = ts.find(this.getCodeFixes(this.activeFile.fileName), function (a) { return a.fixId === fixId; });
-            ts.Debug.assert(fixWithId !== undefined, "No available code fix has that group id.", function () {
-                return "Expected '" + fixId + "'. Available action ids: " + ts.mapDefined(_this.getCodeFixes(_this.activeFile.fileName), function (a) { return a.fixId; });
-            });
-            ts.Debug.assertEqual(fixWithId.fixAllDescription, fixAllDescription);
-            var _b = this.languageService.getCombinedCodeFix({ type: "file", fileName: this.activeFile.fileName }, fixId, this.formatCodeSettings, ts.defaultPreferences), changes = _b.changes, commands = _b.commands;
-            assert.deepEqual(commands, expectedCommands);
-            assert(changes.every(function (c) { return c.fileName === _this.activeFile.fileName; }), "TODO: support testing codefixes that touch multiple files");
-            this.applyChanges(changes);
-            this.verifyCurrentFileContent(newFileContent);
-        };
-        /**
-         * Applies fixes for the errors in fileName and compares the results to
-         * expectedContents after all fixes have been applied.
-         *
-         * Note: applying one codefix may generate another (eg: remove duplicate implements
-         * may generate an extends -> interface conversion fix).
-         * @param expectedContents The contents of the file after the fixes are applied.
-         * @param fileName The file to check. If not supplied, the current open file is used.
-         */
-        TestState.prototype.verifyFileAfterCodeFix = function (expectedContents, fileName) {
-            fileName = fileName ? fileName : this.activeFile.fileName;
-            this.applyCodeActions(this.getCodeFixes(fileName));
-            var actualContents = this.getFileContent(fileName);
-            if (this.removeWhitespace(actualContents) !== this.removeWhitespace(expectedContents)) {
-                this.raiseError("Actual text doesn't match expected text. Actual:\n" + actualContents + "\n\nExpected:\n" + expectedContents);
-            }
-        };
-        TestState.prototype.verifyCodeFix = function (options) {
-            var fileName = this.activeFile.fileName;
-            var actions = this.getCodeFixes(fileName, options.errorCode, options.preferences);
-            var index = options.index;
-            if (index === undefined) {
-                if (!(actions && actions.length === 1)) {
-                    this.raiseError("Should find exactly one codefix, but " + (actions ? actions.length : "none") + " found. " + (actions ? actions.map(function (a) { return Harness.IO.newLine() + " \"" + a.description + "\""; }) : ""));
-                }
-                index = 0;
-            }
-            else {
-                if (!(actions && actions.length >= index + 1)) {
-                    this.raiseError("Should find at least " + (index + 1) + " codefix(es), but " + (actions ? actions.length : "none") + " found.");
-                }
-            }
-            var action = actions[index];
-            assert.equal(action.description, options.description);
-            for (var _i = 0, _a = action.changes; _i < _a.length; _i++) {
-                var change = _a[_i];
-                this.applyEdits(change.fileName, change.textChanges, /*isFormattingEdit*/ false);
-            }
-            this.verifyNewContent(options, action.changes.map(function (c) { return c.fileName; }));
-        };
-        TestState.prototype.verifyNewContent = function (options, changedFiles) {
-            var assertedChangedFiles = !options.newFileContent || typeof options.newFileContent === "string"
-                ? [this.activeFile.fileName]
-                : ts.getOwnKeys(options.newFileContent);
-            assert.deepEqual(assertedChangedFiles, changedFiles);
-            if (options.newFileContent !== undefined) {
-                assert(!options.newRangeContent);
-                if (typeof options.newFileContent === "string") {
-                    this.verifyCurrentFileContent(options.newFileContent);
-                }
-                else {
-                    for (var fileName in options.newFileContent) {
-                        this.verifyFileContent(fileName, options.newFileContent[fileName]);
-                    }
-                }
-            }
-            else {
-                this.verifyRangeIs(options.newRangeContent, /*includeWhitespace*/ true);
-            }
-        };
-        /**
-         * Rerieves a codefix satisfying the parameters, or undefined if no such codefix is found.
-         * @param fileName Path to file where error should be retrieved from.
-         */
-        TestState.prototype.getCodeFixes = function (fileName, errorCode, preferences) {
-            var _this = this;
-            if (preferences === void 0) { preferences = ts.defaultPreferences; }
-            var diagnosticsForCodeFix = this.getDiagnostics(fileName, /*includeSuggestions*/ true).map(function (diagnostic) { return ({
-                start: diagnostic.start,
-                length: diagnostic.length,
-                code: diagnostic.code
-            }); });
-            return ts.flatMap(ts.deduplicate(diagnosticsForCodeFix, ts.equalOwnProperties), function (diagnostic) {
-                if (errorCode !== undefined && errorCode !== diagnostic.code) {
-                    return;
-                }
-                return _this.languageService.getCodeFixesAtPosition(fileName, diagnostic.start, diagnostic.start + diagnostic.length, [diagnostic.code], _this.formatCodeSettings, preferences);
-            });
-        };
-        TestState.prototype.applyCodeActions = function (actions, index) {
-            if (index === undefined) {
-                if (!(actions && actions.length === 1)) {
-                    this.raiseError("Should find exactly one codefix, but " + (actions ? actions.length : "none") + " found. " + (actions ? actions.map(function (a) { return Harness.IO.newLine() + " \"" + a.description + "\""; }) : ""));
-                }
-                index = 0;
-            }
-            else {
-                if (!(actions && actions.length >= index + 1)) {
-                    this.raiseError("Should find at least " + (index + 1) + " codefix(es), but " + (actions ? actions.length : "none") + " found.");
-                }
-            }
-            this.applyChanges(actions[index].changes);
-        };
-        TestState.prototype.applyChanges = function (changes) {
-            for (var _i = 0, changes_1 = changes; _i < changes_1.length; _i++) {
-                var change = changes_1[_i];
-                this.applyEdits(change.fileName, change.textChanges, /*isFormattingEdit*/ false);
-            }
-        };
-        TestState.prototype.verifyImportFixAtPosition = function (expectedTextArray, errorCode, preferences) {
-            var _this = this;
-            var fileName = this.activeFile.fileName;
-            var ranges = this.getRanges().filter(function (r) { return r.fileName === fileName; });
-            if (ranges.length > 1) {
-                this.raiseError("Exactly one range should be specified in the testfile.");
-            }
-            var range = ts.firstOrUndefined(ranges);
-            var codeFixes = this.getCodeFixes(fileName, errorCode, preferences).filter(function (f) { return f.fixId === undefined; }); // TODO: GH#20315 filter out those that use the import fix ID;
-            if (codeFixes.length === 0) {
-                if (expectedTextArray.length !== 0) {
-                    this.raiseError("No codefixes returned.");
-                }
-                return;
-            }
-            var actualTextArray = [];
-            var scriptInfo = this.languageServiceAdapterHost.getScriptInfo(fileName);
-            var originalContent = scriptInfo.content;
-            for (var _i = 0, codeFixes_1 = codeFixes; _i < codeFixes_1.length; _i++) {
-                var codeFix = codeFixes_1[_i];
-                ts.Debug.assert(codeFix.changes.length === 1);
-                var change = ts.first(codeFix.changes);
-                ts.Debug.assert(change.fileName === fileName);
-                this.applyEdits(change.fileName, change.textChanges, /*isFormattingEdit*/ false);
-                var text = range ? this.rangeText(range) : this.getFileContent(this.activeFile.fileName);
-                actualTextArray.push(text);
-                scriptInfo.updateContent(originalContent);
-            }
-            if (expectedTextArray.length !== actualTextArray.length) {
-                this.raiseError("Expected " + expectedTextArray.length + " import fixes, got " + actualTextArray.length);
-            }
-            ts.zipWith(expectedTextArray, actualTextArray, function (expected, actual, index) {
-                if (expected !== actual) {
-                    _this.raiseError("Import fix at index " + index + " doesn't match.\n" + showTextDiff(expected, actual));
-                }
-            });
-        };
-        TestState.prototype.verifyDocCommentTemplate = function (expected) {
-            var name = "verifyDocCommentTemplate";
-            var actual = this.languageService.getDocCommentTemplateAtPosition(this.activeFile.fileName, this.currentCaretPosition);
-            if (expected === undefined) {
-                if (actual) {
-                    this.raiseError(name + " failed - expected no template but got {newText: \"" + actual.newText + "\", caretOffset: " + actual.caretOffset + "}");
-                }
-                return;
-            }
-            else {
-                if (actual === undefined) {
-                    this.raiseError(name + " failed - expected the template {newText: \"" + expected.newText + "\", caretOffset: \"" + expected.caretOffset + "\"} but got nothing instead");
-                }
-                if (actual.newText !== expected.newText) {
-                    this.raiseError(name + " failed for expected insertion.\n" + showTextDiff(expected.newText, actual.newText));
-                }
-                if (actual.caretOffset !== expected.caretOffset) {
-                    this.raiseError(name + " failed - expected caretOffset: " + expected.caretOffset + "\nactual caretOffset:" + actual.caretOffset);
-                }
-            }
-        };
-        TestState.prototype.verifyBraceCompletionAtPosition = function (negative, openingBrace) {
-            var openBraceMap = ts.createMapFromTemplate({
-                "(": 40 /* openParen */,
-                "{": 123 /* openBrace */,
-                "[": 91 /* openBracket */,
-                "'": 39 /* singleQuote */,
-                '"': 34 /* doubleQuote */,
-                "`": 96 /* backtick */,
-                "<": 60 /* lessThan */
-            });
-            var charCode = openBraceMap.get(openingBrace);
-            if (!charCode) {
-                throw this.raiseError("Invalid openingBrace '" + openingBrace + "' specified.");
-            }
-            var position = this.currentCaretPosition;
-            var validBraceCompletion = this.languageService.isValidBraceCompletionAtPosition(this.activeFile.fileName, position, charCode);
-            if (!negative && !validBraceCompletion) {
-                this.raiseError(position + " is not a valid brace completion position for " + openingBrace);
-            }
-            if (negative && validBraceCompletion) {
-                this.raiseError(position + " is a valid brace completion position for " + openingBrace);
-            }
-        };
-        TestState.prototype.verifyJsxClosingTag = function (map) {
-            for (var markerName in map) {
-                this.goToMarker(markerName);
-                var actual = this.languageService.getJsxClosingTagAtPosition(this.activeFile.fileName, this.currentCaretPosition);
-                assert.deepEqual(actual, map[markerName]);
-            }
-        };
-        TestState.prototype.verifyMatchingBracePosition = function (bracePosition, expectedMatchPosition) {
-            var actual = this.languageService.getBraceMatchingAtPosition(this.activeFile.fileName, bracePosition);
-            if (actual.length !== 2) {
-                this.raiseError("verifyMatchingBracePosition failed - expected result to contain 2 spans, but it had " + actual.length);
-            }
-            var actualMatchPosition = -1;
-            if (bracePosition === actual[0].start) {
-                actualMatchPosition = actual[1].start;
-            }
-            else if (bracePosition === actual[1].start) {
-                actualMatchPosition = actual[0].start;
-            }
-            else {
-                this.raiseError("verifyMatchingBracePosition failed - could not find the brace position: " + bracePosition + " in the returned list: (" + actual[0].start + "," + ts.textSpanEnd(actual[0]) + ") and (" + actual[1].start + "," + ts.textSpanEnd(actual[1]) + ")");
-            }
-            if (actualMatchPosition !== expectedMatchPosition) {
-                this.raiseError("verifyMatchingBracePosition failed - expected: " + actualMatchPosition + ",  actual: " + expectedMatchPosition);
-            }
-        };
-        TestState.prototype.verifyNoMatchingBracePosition = function (bracePosition) {
-            var actual = this.languageService.getBraceMatchingAtPosition(this.activeFile.fileName, bracePosition);
-            if (actual.length !== 0) {
-                this.raiseError("verifyNoMatchingBracePosition failed - expected: 0 spans, actual: " + actual.length);
-            }
-        };
-        TestState.prototype.verifySpanOfEnclosingComment = function (negative, onlyMultiLineDiverges) {
-            var expected = !negative;
-            var position = this.currentCaretPosition;
-            var fileName = this.activeFile.fileName;
-            var actual = !!this.languageService.getSpanOfEnclosingComment(fileName, position, /*onlyMultiLine*/ false);
-            var actualOnlyMultiLine = !!this.languageService.getSpanOfEnclosingComment(fileName, position, /*onlyMultiLine*/ true);
-            if (expected !== actual || onlyMultiLineDiverges === (actual === actualOnlyMultiLine)) {
-                this.raiseError("verifySpanOfEnclosingComment failed:\n                position: '" + position + "'\n                fileName: '" + fileName + "'\n                onlyMultiLineDiverges: '" + onlyMultiLineDiverges + "'\n                actual: '" + actual + "'\n                actualOnlyMultiLine: '" + actualOnlyMultiLine + "'\n                expected: '" + expected + "'.");
-            }
-        };
-        /*
-            Check number of navigationItems which match both searchValue and matchKind,
-            if a filename is passed in, limit the results to that file.
-            Report an error if expected value and actual value do not match.
-        */
-        TestState.prototype.verifyNavigationItemsCount = function (expected, searchValue, matchKind, fileName) {
-            var items = this.languageService.getNavigateToItems(searchValue, /*maxResultCount*/ undefined, fileName);
-            var actual = 0;
-            // Count only the match that match the same MatchKind
-            for (var _i = 0, items_1 = items; _i < items_1.length; _i++) {
-                var item = items_1[_i];
-                if (!matchKind || item.matchKind === matchKind) {
-                    actual++;
-                }
-            }
-            if (expected !== actual) {
-                this.raiseError("verifyNavigationItemsCount failed - found: " + actual + " navigation items, expected: " + expected + ".");
-            }
-        };
-        /*
-            Verify that returned navigationItems from getNavigateToItems have matched searchValue, matchKind, and kind.
-            Report an error if getNavigateToItems does not find any matched searchValue.
-        */
-        TestState.prototype.verifyNavigationItemsListContains = function (name, kind, searchValue, matchKind, fileName, parentName) {
-            var items = this.languageService.getNavigateToItems(searchValue);
-            if (!items || items.length === 0) {
-                this.raiseError("verifyNavigationItemsListContains failed - found 0 navigation items, expected at least one.");
-            }
-            for (var _i = 0, items_2 = items; _i < items_2.length; _i++) {
-                var item = items_2[_i];
-                if (item && item.name === name && item.kind === kind &&
-                    (matchKind === undefined || item.matchKind === matchKind) &&
-                    (fileName === undefined || item.fileName === fileName) &&
-                    (parentName === undefined || item.containerName === parentName)) {
-                    return;
-                }
-            }
-            // if there was an explicit match kind specified, then it should be validated.
-            if (matchKind !== undefined) {
-                var missingItem = { name: name, kind: kind, searchValue: searchValue, matchKind: matchKind, fileName: fileName, parentName: parentName };
-                this.raiseError("verifyNavigationItemsListContains failed - could not find the item: " + stringify(missingItem) + " in the returned list: (" + stringify(items) + ")");
-            }
-        };
-        TestState.prototype.verifyNavigationBar = function (json, options) {
-            this.verifyNavigationTreeOrBar(json, this.languageService.getNavigationBarItems(this.activeFile.fileName), "Bar", options);
-        };
-        TestState.prototype.verifyNavigationTree = function (json, options) {
-            this.verifyNavigationTreeOrBar(json, this.languageService.getNavigationTree(this.activeFile.fileName), "Tree", options);
-        };
-        TestState.prototype.verifyNavigationTreeOrBar = function (json, tree, name, options) {
-            if (JSON.stringify(tree, replacer) !== JSON.stringify(json)) {
-                this.raiseError("verifyNavigation" + name + " failed - expected: " + stringify(json) + ", got: " + stringify(tree, replacer));
-            }
-            function replacer(key, value) {
-                switch (key) {
-                    case "spans":
-                    case "nameSpan":
-                        return options && options.checkSpans ? value : undefined;
-                    case "start":
-                    case "length":
-                        // Never omit the values in a span, even if they are 0.
-                        return value;
-                    case "childItems":
-                        return !value || value.length === 0 ? undefined : value;
-                    default:
-                        // Omit falsy values, those are presumed to be the default.
-                        return value || undefined;
-                }
-            }
-        };
-        TestState.prototype.printNavigationItems = function (searchValue) {
-            var items = this.languageService.getNavigateToItems(searchValue);
-            Harness.IO.log("NavigationItems list (" + items.length + " items)");
-            for (var _i = 0, items_3 = items; _i < items_3.length; _i++) {
-                var item = items_3[_i];
-                Harness.IO.log("name: " + item.name + ", kind: " + item.kind + ", parentName: " + item.containerName + ", fileName: " + item.fileName);
-            }
-        };
-        TestState.prototype.printNavigationBar = function () {
-            var items = this.languageService.getNavigationBarItems(this.activeFile.fileName);
-            Harness.IO.log("Navigation bar (" + items.length + " items)");
-            for (var _i = 0, items_4 = items; _i < items_4.length; _i++) {
-                var item = items_4[_i];
-                Harness.IO.log(ts.repeatString(" ", item.indent) + "name: " + item.text + ", kind: " + item.kind + ", childItems: " + item.childItems.map(function (child) { return child.text; }));
-            }
-        };
-        TestState.prototype.getOccurrencesAtCurrentPosition = function () {
-            return this.languageService.getOccurrencesAtPosition(this.activeFile.fileName, this.currentCaretPosition);
-        };
-        TestState.prototype.verifyOccurrencesAtPositionListContains = function (fileName, start, end, isWriteAccess) {
-            var occurrences = this.getOccurrencesAtCurrentPosition();
-            if (!occurrences || occurrences.length === 0) {
-                return this.raiseError("verifyOccurrencesAtPositionListContains failed - found 0 references, expected at least one.");
-            }
-            for (var _i = 0, occurrences_1 = occurrences; _i < occurrences_1.length; _i++) {
-                var occurrence = occurrences_1[_i];
-                if (occurrence && occurrence.fileName === fileName && occurrence.textSpan.start === start && ts.textSpanEnd(occurrence.textSpan) === end) {
-                    if (typeof isWriteAccess !== "undefined" && occurrence.isWriteAccess !== isWriteAccess) {
-                        this.raiseError("verifyOccurrencesAtPositionListContains failed - item isWriteAccess value does not match, actual: " + occurrence.isWriteAccess + ", expected: " + isWriteAccess + ".");
-                    }
-                    return;
-                }
-            }
-            var missingItem = { fileName: fileName, start: start, end: end, isWriteAccess: isWriteAccess };
-            this.raiseError("verifyOccurrencesAtPositionListContains failed - could not find the item: " + stringify(missingItem) + " in the returned list: (" + stringify(occurrences) + ")");
-        };
-        TestState.prototype.verifyOccurrencesAtPositionListCount = function (expectedCount) {
-            var occurrences = this.getOccurrencesAtCurrentPosition();
-            var actualCount = occurrences ? occurrences.length : 0;
-            if (expectedCount !== actualCount) {
-                this.raiseError("verifyOccurrencesAtPositionListCount failed - actual: " + actualCount + ", expected:" + expectedCount);
-            }
-        };
-        TestState.prototype.getDocumentHighlightsAtCurrentPosition = function (fileNamesToSearch) {
-            var _this = this;
-            var filesToSearch = fileNamesToSearch.map(function (name) { return ts.combinePaths(_this.basePath, name); });
-            return this.languageService.getDocumentHighlights(this.activeFile.fileName, this.currentCaretPosition, filesToSearch);
-        };
-        TestState.prototype.verifyRangesAreOccurrences = function (isWriteAccess) {
-            var ranges = this.getRanges();
-            for (var _i = 0, ranges_3 = ranges; _i < ranges_3.length; _i++) {
-                var r = ranges_3[_i];
-                this.goToRangeStart(r);
-                this.verifyOccurrencesAtPositionListCount(ranges.length);
-                for (var _a = 0, ranges_4 = ranges; _a < ranges_4.length; _a++) {
-                    var range = ranges_4[_a];
-                    this.verifyOccurrencesAtPositionListContains(range.fileName, range.pos, range.end, isWriteAccess);
-                }
-            }
-        };
-        TestState.prototype.verifyRangesWithSameTextAreRenameLocations = function () {
-            var _this = this;
-            this.rangesByText().forEach(function (ranges) { return _this.verifyRangesAreRenameLocations(ranges); });
-        };
-        TestState.prototype.verifyRangesWithSameTextAreDocumentHighlights = function () {
-            var _this = this;
-            this.rangesByText().forEach(function (ranges) { return _this.verifyRangesAreDocumentHighlights(ranges, /*options*/ undefined); });
-        };
-        TestState.prototype.verifyDocumentHighlightsOf = function (startRange, ranges, options) {
-            var fileNames = options && options.filesToSearch || unique(ranges, function (range) { return range.fileName; });
-            this.goToRangeStart(startRange);
-            this.verifyDocumentHighlights(ranges, fileNames);
-        };
-        TestState.prototype.verifyRangesAreDocumentHighlights = function (ranges, options) {
-            ranges = ranges || this.getRanges();
-            var fileNames = options && options.filesToSearch || unique(ranges, function (range) { return range.fileName; });
-            for (var _i = 0, ranges_5 = ranges; _i < ranges_5.length; _i++) {
-                var range = ranges_5[_i];
-                this.goToRangeStart(range);
-                this.verifyDocumentHighlights(ranges, fileNames);
-            }
-        };
-        TestState.prototype.verifyNoDocumentHighlights = function (startRange) {
-            this.goToRangeStart(startRange);
-            var documentHighlights = this.getDocumentHighlightsAtCurrentPosition([this.activeFile.fileName]);
-            var numHighlights = ts.length(documentHighlights);
-            if (numHighlights > 0) {
-                this.raiseError("verifyNoDocumentHighlights failed - unexpectedly got " + numHighlights + " highlights");
-            }
-        };
-        TestState.prototype.verifyDocumentHighlights = function (expectedRanges, fileNames) {
-            var _this = this;
-            if (fileNames === void 0) { fileNames = [this.activeFile.fileName]; }
-            fileNames = ts.map(fileNames, ts.normalizePath);
-            var documentHighlights = this.getDocumentHighlightsAtCurrentPosition(fileNames) || [];
-            for (var _i = 0, documentHighlights_1 = documentHighlights; _i < documentHighlights_1.length; _i++) {
-                var dh = documentHighlights_1[_i];
-                if (fileNames.indexOf(dh.fileName) === -1) {
-                    this.raiseError("verifyDocumentHighlights failed - got highlights in unexpected file name " + dh.fileName);
-                }
-            }
-            var _loop_9 = function (fileName) {
-                var expectedRangesInFile = expectedRanges.filter(function (r) { return ts.normalizePath(r.fileName) === fileName; });
-                var highlights = ts.find(documentHighlights, function (dh) { return dh.fileName === fileName; });
-                var spansInFile = highlights ? highlights.highlightSpans.sort(function (s1, s2) { return s1.textSpan.start - s2.textSpan.start; }) : [];
-                if (expectedRangesInFile.length !== spansInFile.length) {
-                    this_4.raiseError("verifyDocumentHighlights failed - In " + fileName + ", expected " + expectedRangesInFile.length + " highlights, got " + spansInFile.length);
-                }
-                ts.zipWith(expectedRangesInFile, spansInFile, function (expectedRange, span) {
-                    if (span.textSpan.start !== expectedRange.pos || ts.textSpanEnd(span.textSpan) !== expectedRange.end) {
-                        _this.raiseError("verifyDocumentHighlights failed - span does not match, actual: " + stringify(span.textSpan) + ", expected: " + expectedRange.pos + "--" + expectedRange.end);
-                    }
-                });
-            };
-            var this_4 = this;
-            for (var _a = 0, fileNames_1 = fileNames; _a < fileNames_1.length; _a++) {
-                var fileName = fileNames_1[_a];
-                _loop_9(fileName);
-            }
-        };
-        TestState.prototype.verifyCodeFixAvailable = function (negative, expected) {
-            assert(!negative || !expected);
-            var codeFixes = this.getCodeFixes(this.activeFile.fileName);
-            var actuals = codeFixes.map(function (fix) { return ({ description: fix.description, commands: fix.commands }); });
-            this.assertObjectsEqual(actuals, negative ? ts.emptyArray : expected);
-        };
-        TestState.prototype.verifyApplicableRefactorAvailableAtMarker = function (negative, markerName) {
-            var isAvailable = this.getApplicableRefactors(this.getMarkerByName(markerName).position).length > 0;
-            if (negative && isAvailable) {
-                this.raiseError("verifyApplicableRefactorAvailableAtMarker failed - expected no refactor at marker " + markerName + " but found some.");
-            }
-            if (!negative && !isAvailable) {
-                this.raiseError("verifyApplicableRefactorAvailableAtMarker failed - expected a refactor at marker " + markerName + " but found none.");
-            }
-        };
-        TestState.prototype.getSelection = function () {
-            return {
-                pos: this.currentCaretPosition,
-                end: this.selectionEnd === -1 ? this.currentCaretPosition : this.selectionEnd
-            };
-        };
-        TestState.prototype.verifyRefactorAvailable = function (negative, name, actionName) {
-            var refactors = this.getApplicableRefactors(this.getSelection());
-            refactors = refactors.filter(function (r) { return r.name === name && (actionName === undefined || r.actions.some(function (a) { return a.name === actionName; })); });
-            var isAvailable = refactors.length > 0;
-            if (negative) {
-                if (isAvailable) {
-                    this.raiseError("verifyApplicableRefactorAvailableForRange failed - expected no refactor but found: " + refactors.map(function (r) { return r.name; }).join(", "));
-                }
-            }
-            else {
-                if (!isAvailable) {
-                    this.raiseError("verifyApplicableRefactorAvailableForRange failed - expected a refactor but found none.");
-                }
-                if (refactors.length > 1) {
-                    this.raiseError(refactors.length + " available refactors both have name " + name + " and action " + actionName);
-                }
-            }
-        };
-        TestState.prototype.verifyRefactor = function (_a) {
-            var name = _a.name, actionName = _a.actionName, refactors = _a.refactors;
-            var actualRefactors = this.getApplicableRefactors(this.getSelection()).filter(function (r) { return r.name === name && r.actions.some(function (a) { return a.name === actionName; }); });
-            this.assertObjectsEqual(actualRefactors, refactors);
-        };
-        TestState.prototype.verifyApplicableRefactorAvailableForRange = function (negative) {
-            var ranges = this.getRanges();
-            if (!(ranges && ranges.length === 1)) {
-                throw new Error("Exactly one refactor range is allowed per test.");
-            }
-            var isAvailable = this.getApplicableRefactors(ts.first(ranges)).length > 0;
-            if (negative && isAvailable) {
-                this.raiseError("verifyApplicableRefactorAvailableForRange failed - expected no refactor but found some.");
-            }
-            if (!negative && !isAvailable) {
-                this.raiseError("verifyApplicableRefactorAvailableForRange failed - expected a refactor but found none.");
-            }
-        };
-        TestState.prototype.applyRefactor = function (_a) {
-            var refactorName = _a.refactorName, actionName = _a.actionName, actionDescription = _a.actionDescription, newContentWithRenameMarker = _a.newContent;
-            var range = this.getSelection();
-            var refactors = this.getApplicableRefactors(range);
-            var refactorsWithName = refactors.filter(function (r) { return r.name === refactorName; });
-            if (refactorsWithName.length === 0) {
-                this.raiseError("The expected refactor: " + refactorName + " is not available at the marker location.\nAvailable refactors: " + refactors.map(function (r) { return r.name; }));
-            }
-            var action = ts.firstDefined(refactorsWithName, function (refactor) { return refactor.actions.find(function (a) { return a.name === actionName; }); });
-            if (!action) {
-                throw this.raiseError("The expected action: " + actionName + " is not included in: " + ts.flatMap(refactorsWithName, function (r) { return r.actions.map(function (a) { return a.name; }); }));
-            }
-            if (action.description !== actionDescription) {
-                this.raiseError("Expected action description to be " + JSON.stringify(actionDescription) + ", got: " + JSON.stringify(action.description));
-            }
-            var editInfo = this.languageService.getEditsForRefactor(this.activeFile.fileName, this.formatCodeSettings, range, refactorName, actionName, ts.defaultPreferences);
-            for (var _i = 0, _b = editInfo.edits; _i < _b.length; _i++) {
-                var edit = _b[_i];
-                this.applyEdits(edit.fileName, edit.textChanges, /*isFormattingEdit*/ false);
-            }
-            var _c = parseNewContent(), renamePosition = _c.renamePosition, newContent = _c.newContent;
-            this.verifyCurrentFileContent(newContent);
-            if (renamePosition === undefined) {
-                if (editInfo.renameLocation !== undefined) {
-                    this.raiseError("Did not expect a rename location, got " + editInfo.renameLocation);
-                }
-            }
-            else {
-                // TODO: test editInfo.renameFilename value
-                assert.isDefined(editInfo.renameFilename);
-                if (renamePosition !== editInfo.renameLocation) {
-                    this.raiseError("Expected rename position of " + renamePosition + ", but got " + editInfo.renameLocation);
-                }
-            }
-            function parseNewContent() {
-                var renamePosition = newContentWithRenameMarker.indexOf("/*RENAME*/");
-                if (renamePosition === -1) {
-                    return { renamePosition: undefined, newContent: newContentWithRenameMarker };
-                }
-                else {
-                    var newContent_1 = newContentWithRenameMarker.slice(0, renamePosition) + newContentWithRenameMarker.slice(renamePosition + "/*RENAME*/".length);
-                    return { renamePosition: renamePosition, newContent: newContent_1 };
-                }
-            }
-        };
-        TestState.prototype.noMoveToNewFile = function () {
-            for (var _i = 0, _a = this.getRanges(); _i < _a.length; _i++) {
-                var range = _a[_i];
-                for (var _b = 0, _c = this.getApplicableRefactors(range, { allowTextChangesInNewFiles: true }); _b < _c.length; _b++) {
-                    var refactor = _c[_b];
-                    if (refactor.name === "Move to a new file") {
-                        ts.Debug.fail("Did not expect to get 'move to a new file' refactor");
-                    }
-                }
-            }
-        };
-        TestState.prototype.moveToNewFile = function (options) {
-            assert(this.getRanges().length === 1);
-            var range = this.getRanges()[0];
-            var refactor = ts.find(this.getApplicableRefactors(range, { allowTextChangesInNewFiles: true }), function (r) { return r.name === "Move to a new file"; });
-            assert(refactor.actions.length === 1);
-            var action = ts.first(refactor.actions);
-            assert(action.name === "Move to a new file" && action.description === "Move to a new file");
-            var editInfo = this.languageService.getEditsForRefactor(this.activeFile.fileName, this.formatCodeSettings, range, refactor.name, action.name, options.preferences || ts.defaultPreferences);
-            this.testNewFileContents(editInfo.edits, options.newFileContents);
-        };
-        TestState.prototype.testNewFileContents = function (edits, newFileContents) {
-            var _loop_10 = function (edit) {
-                var newContent = newFileContents[edit.fileName];
-                if (newContent === undefined) {
-                    this_5.raiseError("There was an edit in " + edit.fileName + " but new content was not specified.");
-                }
-                if (this_5.testData.files.some(function (f) { return f.fileName === edit.fileName; })) {
-                    this_5.applyEdits(edit.fileName, edit.textChanges, /*isFormattingEdit*/ false);
-                    this_5.openFile(edit.fileName);
-                    this_5.verifyCurrentFileContent(newContent);
-                }
-                else {
-                    assert(edit.textChanges.length === 1);
-                    var change = ts.first(edit.textChanges);
-                    assert.deepEqual(change.span, ts.createTextSpan(0, 0));
-                    assert.equal(change.newText, newContent, "Content for " + edit.fileName);
-                }
-            };
-            var this_5 = this;
-            for (var _i = 0, edits_1 = edits; _i < edits_1.length; _i++) {
-                var edit = edits_1[_i];
-                _loop_10(edit);
-            }
-            var _loop_11 = function (fileName) {
-                assert(edits.some(function (e) { return e.fileName === fileName; }));
-            };
-            for (var fileName in newFileContents) {
-                _loop_11(fileName);
-            }
-        };
-        TestState.prototype.verifyFileAfterApplyingRefactorAtMarker = function (markerName, expectedContent, refactorNameToApply, actionName, formattingOptions) {
-            formattingOptions = formattingOptions || this.formatCodeSettings;
-            var markerPos = this.getMarkerByName(markerName).position;
-            var applicableRefactors = this.languageService.getApplicableRefactors(this.activeFile.fileName, markerPos, ts.defaultPreferences);
-            var applicableRefactorToApply = ts.find(applicableRefactors, function (refactor) { return refactor.name === refactorNameToApply; });
-            if (!applicableRefactorToApply) {
-                this.raiseError("The expected refactor: " + refactorNameToApply + " is not available at the marker location.");
-            }
-            var editInfo = this.languageService.getEditsForRefactor(this.activeFile.fileName, formattingOptions, markerPos, refactorNameToApply, actionName, ts.defaultPreferences);
-            for (var _i = 0, _a = editInfo.edits; _i < _a.length; _i++) {
-                var edit = _a[_i];
-                this.applyEdits(edit.fileName, edit.textChanges, /*isFormattingEdit*/ false);
-            }
-            var actualContent = this.getFileContent(this.activeFile.fileName);
-            if (actualContent !== expectedContent) {
-                this.raiseError("verifyFileAfterApplyingRefactors failed:\n" + showTextDiff(expectedContent, actualContent));
-            }
-        };
-        TestState.prototype.printAvailableCodeFixes = function () {
-            var codeFixes = this.getCodeFixes(this.activeFile.fileName);
-            Harness.IO.log(stringify(codeFixes));
-        };
-        // Get the text of the entire line the caret is currently at
-        TestState.prototype.getCurrentLineContent = function () {
-            var text = this.getFileContent(this.activeFile.fileName);
-            var pos = this.currentCaretPosition;
-            var startPos = pos, endPos = pos;
-            while (startPos > 0) {
-                var ch = text.charCodeAt(startPos - 1);
-                if (ch === 13 /* carriageReturn */ || ch === 10 /* lineFeed */) {
-                    break;
-                }
-                startPos--;
-            }
-            while (endPos < text.length) {
-                var ch = text.charCodeAt(endPos);
-                if (ch === 13 /* carriageReturn */ || ch === 10 /* lineFeed */) {
-                    break;
-                }
-                endPos++;
-            }
-            return text.substring(startPos, endPos);
-        };
-        TestState.prototype.assertItemInCompletionList = function (items, entryId, text, documentation, kind, spanIndex, hasAction, options) {
-            var _this = this;
-            var eq = function (a, b, msg) {
-                assert.deepEqual(a, b, _this.assertionMessageAtLastKnownMarker(msg + " for " + stringify(entryId)));
-            };
-            var matchingItems = items.filter(function (item) { return item.name === entryId.name && item.source === entryId.source; });
-            if (matchingItems.length === 0) {
-                var itemsString = items.map(function (item) { return stringify({ name: item.name, source: item.source, kind: item.kind }); }).join(",\n");
-                this.raiseError("Expected \"" + stringify({ entryId: entryId, text: text, documentation: documentation, kind: kind }) + "\" to be in list [" + itemsString + "]");
-            }
-            else if (matchingItems.length > 1) {
-                this.raiseError("Found duplicate completion items for " + stringify(entryId));
-            }
-            var item = matchingItems[0];
-            if (documentation !== undefined || text !== undefined || entryId.source !== undefined) {
-                var details = this.getCompletionEntryDetails(item.name, item.source);
-                if (documentation !== undefined) {
-                    eq(ts.displayPartsToString(details.documentation), documentation, "completion item documentation");
-                }
-                if (text !== undefined) {
-                    eq(ts.displayPartsToString(details.displayParts), text, "completion item detail text");
-                }
-                if (entryId.source === undefined) {
-                    eq(options && options.sourceDisplay, /*b*/ undefined, "source display");
-                }
-                else {
-                    eq(details.source, [ts.textPart(options.sourceDisplay)], "source display");
-                }
-            }
-            if (kind !== undefined) {
-                if (typeof kind === "string") {
-                    eq(item.kind, kind, "completion item kind");
-                }
-                else {
-                    if (kind.kind) {
-                        eq(item.kind, kind.kind, "completion item kind");
-                    }
-                    if (kind.kindModifiers !== undefined) {
-                        eq(item.kindModifiers, kind.kindModifiers, "completion item kindModifiers");
-                    }
-                }
-            }
-            if (spanIndex !== undefined) {
-                var span = this.getTextSpanForRangeAtIndex(spanIndex);
-                assert.isTrue(TestState.textSpansEqual(span, item.replacementSpan), this.assertionMessageAtLastKnownMarker(stringify(span) + " does not equal " + stringify(item.replacementSpan) + " replacement span for " + stringify(entryId)));
-            }
-            eq(item.hasAction, hasAction, "hasAction");
-            eq(item.isRecommended, options && options.isRecommended, "isRecommended");
-            eq(item.insertText, options && options.insertText, "insertText");
-            eq(item.replacementSpan, options && options.replacementSpan && ts.createTextSpanFromRange(options.replacementSpan), "replacementSpan");
-        };
-        TestState.prototype.findFile = function (indexOrName) {
-            if (typeof indexOrName === "number") {
-                var index = indexOrName;
-                if (index >= this.testData.files.length) {
-                    throw new Error("File index (" + index + ") in openFile was out of range. There are only " + this.testData.files.length + " files in this test.");
-                }
-                else {
-                    return this.testData.files[index];
-                }
-            }
-            else if (ts.isString(indexOrName)) {
-                var name_1 = ts.normalizePath(indexOrName);
-                // names are stored in the compiler with this relative path, this allows people to use goTo.file on just the fileName
-                name_1 = name_1.indexOf("/") === -1 ? (this.basePath + "/" + name_1) : name_1;
-                var availableNames_1 = [];
-                var result = ts.forEach(this.testData.files, function (file) {
-                    var fn = ts.normalizePath(file.fileName);
-                    if (fn) {
-                        if (fn === name_1) {
-                            return file;
-                        }
-                        availableNames_1.push(fn);
-                    }
-                });
-                if (!result) {
-                    throw new Error("No test file named \"" + name_1 + "\" exists. Available file names are: " + availableNames_1.join(", "));
-                }
-                return result;
-            }
-            else {
-                return ts.Debug.assertNever(indexOrName);
-            }
-        };
-        TestState.prototype.getLineColStringAtPosition = function (position) {
-            var pos = this.languageServiceAdapterHost.positionToLineAndCharacter(this.activeFile.fileName, position);
-            return "line " + (pos.line + 1) + ", col " + pos.character;
-        };
-        TestState.prototype.getTextSpanForRangeAtIndex = function (index) {
-            var ranges = this.getRanges();
-            if (ranges.length > index) {
-                return ts.createTextSpanFromRange(ranges[index]);
-            }
-            else {
-                throw this.raiseError("Supplied span index: " + index + " does not exist in range list of size: " + ranges.length);
-            }
-        };
-        TestState.prototype.getMarkerByName = function (markerName) {
-            var markerPos = this.testData.markerPositions.get(markerName);
-            if (markerPos === undefined) {
-                throw new Error("Unknown marker \"" + markerName + "\" Available markers: " + this.getMarkerNames().map(function (m) { return "\"" + m + "\""; }).join(", "));
-            }
-            else {
-                return markerPos;
-            }
-        };
-        TestState.prototype.setCancelled = function (numberOfCalls) {
-            this.cancellationToken.setCancelled(numberOfCalls);
-        };
-        TestState.prototype.resetCancelled = function () {
-            this.cancellationToken.resetCancelled();
-        };
-        TestState.textSpansEqual = function (a, b) {
-            return !!a && !!b && a.start === b.start && a.length === b.length;
-        };
-        TestState.prototype.getEditsForFileRename = function (options) {
-            var changes = this.languageService.getEditsForFileRename(options.oldPath, options.newPath, this.formatCodeSettings, ts.defaultPreferences);
-            this.testNewFileContents(changes, options.newFileContents);
-        };
-        TestState.prototype.getApplicableRefactors = function (positionOrRange, preferences) {
-            if (preferences === void 0) { preferences = ts.defaultPreferences; }
-            return this.languageService.getApplicableRefactors(this.activeFile.fileName, positionOrRange, preferences) || ts.emptyArray;
-        };
-        return TestState;
-    }());
-    FourSlash.TestState = TestState;
-    function runFourSlashTest(basePath, testType, fileName) {
-        var content = Harness.IO.readFile(fileName);
-        runFourSlashTestContent(basePath, testType, content, fileName);
-    }
-    FourSlash.runFourSlashTest = runFourSlashTest;
-    function runFourSlashTestContent(basePath, testType, content, fileName) {
-        // Give file paths an absolute path for the virtual file system
-        var absoluteBasePath = ts.combinePaths(Harness.virtualFileSystemRoot, basePath);
-        var absoluteFileName = ts.combinePaths(Harness.virtualFileSystemRoot, fileName);
-        // Parse out the files and their metadata
-        var testData = parseTestData(absoluteBasePath, content, absoluteFileName);
-        var state = new TestState(absoluteBasePath, testType, testData);
-        var output = ts.transpileModule(content, { reportDiagnostics: true });
-        if (output.diagnostics.length > 0) {
-            throw new Error("Syntax error in " + absoluteBasePath + ": " + output.diagnostics[0].messageText);
-        }
-        runCode(output.outputText, state);
-    }
-    FourSlash.runFourSlashTestContent = runFourSlashTestContent;
-    function runCode(code, state) {
-        // Compile and execute the test
-        var wrappedCode = "(function(test, goTo, verify, edit, debug, format, cancellation, classification, verifyOperationIsCancelled) {\n" + code + "\n})";
-        try {
-            var test_1 = new FourSlashInterface.Test(state);
-            var goTo = new FourSlashInterface.GoTo(state);
-            var verify = new FourSlashInterface.Verify(state);
-            var edit = new FourSlashInterface.Edit(state);
-            var debug = new FourSlashInterface.Debug(state);
-            var format = new FourSlashInterface.Format(state);
-            var cancellation = new FourSlashInterface.Cancellation(state);
-            var f = eval(wrappedCode);
-            f(test_1, goTo, verify, edit, debug, format, cancellation, FourSlashInterface.Classification, verifyOperationIsCancelled);
-        }
-        catch (err) {
-            throw err;
-        }
-    }
-    function chompLeadingSpace(content) {
-        var lines = content.split("\n");
-        for (var _i = 0, lines_4 = lines; _i < lines_4.length; _i++) {
-            var line = lines_4[_i];
-            if ((line.length !== 0) && (line.charAt(0) !== " ")) {
-                return content;
-            }
-        }
-        return lines.map(function (s) { return s.substr(1); }).join("\n");
-    }
-    function parseTestData(basePath, contents, fileName) {
-        // Regex for parsing options in the format "@Alpha: Value of any sort"
-        var optionRegex = /^\s*@(\w+): (.*)\s*/;
-        // List of all the subfiles we've parsed out
-        var files = [];
-        // Global options
-        var globalOptions = {};
-        // Marker positions
-        // Split up the input file by line
-        // Note: IE JS engine incorrectly handles consecutive delimiters here when using RegExp split, so
-        // we have to string-based splitting instead and try to figure out the delimiting chars
-        var lines = contents.split("\n");
-        var markerPositions = ts.createMap();
-        var markers = [];
-        var ranges = [];
-        // Stuff related to the subfile we're parsing
-        var currentFileContent;
-        var currentFileName = fileName;
-        var currentFileSymlinks;
-        var currentFileOptions = {};
-        function nextFile() {
-            if (currentFileContent === undefined)
-                return;
-            var file = parseFileContent(currentFileContent, currentFileName, markerPositions, markers, ranges);
-            file.fileOptions = currentFileOptions;
-            file.symlinks = currentFileSymlinks;
-            // Store result file
-            files.push(file);
-            currentFileContent = undefined;
-            currentFileOptions = {};
-            currentFileName = fileName;
-            currentFileSymlinks = undefined;
-        }
-        for (var _i = 0, lines_5 = lines; _i < lines_5.length; _i++) {
-            var line = lines_5[_i];
-            if (line.length > 0 && line.charAt(line.length - 1) === "\r") {
-                line = line.substr(0, line.length - 1);
-            }
-            if (line.substr(0, 4) === "////") {
-                var text = line.substr(4);
-                currentFileContent = currentFileContent === undefined ? text : currentFileContent + "\n" + text;
-            }
-            else if (line.substr(0, 2) === "//") {
-                // Comment line, check for global/file @options and record them
-                var match = optionRegex.exec(line.substr(2));
-                if (match) {
-                    var _a = match.slice(1), key = _a[0], value = _a[1];
-                    if (!ts.contains(fileMetadataNames, key)) {
-                        // Check if the match is already existed in the global options
-                        if (globalOptions[key] !== undefined) {
-                            throw new Error("Global option '" + key + "' already exists");
-                        }
-                        globalOptions[key] = value;
-                    }
-                    else {
-                        switch (key) {
-                            case "Filename" /* fileName */:
-                                // Found an @FileName directive, if this is not the first then create a new subfile
-                                nextFile();
-                                currentFileName = ts.isRootedDiskPath(value) ? value : basePath + "/" + value;
-                                currentFileOptions[key] = value;
-                                break;
-                            case "Symlink" /* symlink */:
-                                currentFileSymlinks = ts.append(currentFileSymlinks, value);
-                                break;
-                            default:
-                                // Add other fileMetadata flag
-                                currentFileOptions[key] = value;
-                        }
-                    }
-                }
-            }
-            // Previously blank lines between fourslash content caused it to be considered as 2 files,
-            // Remove this behavior since it just causes errors now
-            else if (line !== "") {
-                // Code line, terminate current subfile if there is one
-                nextFile();
-            }
-        }
-        // @Filename is the only directive that can be used in a test that contains tsconfig.json file.
-        var config = ts.find(files, isConfig);
-        if (config) {
-            var directive = getNonFileNameOptionInFileList(files);
-            if (!directive) {
-                directive = getNonFileNameOptionInObject(globalOptions);
-            }
-            if (directive) {
-                throw Error("It is not allowed to use " + config.fileName + " along with directive '" + directive + "'");
-            }
-        }
-        return {
-            markerPositions: markerPositions,
-            markers: markers,
-            globalOptions: globalOptions,
-            files: files,
-            ranges: ranges
-        };
-    }
-    function isConfig(file) {
-        return Harness.getConfigNameFromFileName(file.fileName) !== undefined;
-    }
-    function getNonFileNameOptionInFileList(files) {
-        return ts.forEach(files, function (f) { return getNonFileNameOptionInObject(f.fileOptions); });
-    }
-    function getNonFileNameOptionInObject(optionObject) {
-        for (var option in optionObject) {
-            if (option !== "Filename" /* fileName */) {
-                return option;
-            }
-        }
-        return undefined;
-    }
-    var State;
-    (function (State) {
-        State[State["none"] = 0] = "none";
-        State[State["inSlashStarMarker"] = 1] = "inSlashStarMarker";
-        State[State["inObjectMarker"] = 2] = "inObjectMarker";
-    })(State || (State = {}));
-    function reportError(fileName, line, col, message) {
-        var errorMessage = fileName + "(" + line + "," + col + "): " + message;
-        throw new Error(errorMessage);
-    }
-    function recordObjectMarker(fileName, location, text, markerMap, markers) {
-        var markerValue;
-        try {
-            // Attempt to parse the marker value as JSON
-            markerValue = JSON.parse("{ " + text + " }");
-        }
-        catch (e) {
-            reportError(fileName, location.sourceLine, location.sourceColumn, "Unable to parse marker text " + e.message);
-        }
-        if (markerValue === undefined) {
-            reportError(fileName, location.sourceLine, location.sourceColumn, "Object markers can not be empty");
-            return undefined;
-        }
-        var marker = {
-            fileName: fileName,
-            position: location.position,
-            data: markerValue
-        };
-        // Object markers can be anonymous
-        if (markerValue.name) {
-            markerMap.set(markerValue.name, marker);
-        }
-        markers.push(marker);
-        return marker;
-    }
-    function recordMarker(fileName, location, name, markerMap, markers) {
-        var marker = {
-            fileName: fileName,
-            position: location.position
-        };
-        // Verify markers for uniqueness
-        if (markerMap.has(name)) {
-            var message = "Marker '" + name + "' is duplicated in the source file contents.";
-            reportError(marker.fileName, location.sourceLine, location.sourceColumn, message);
-            return undefined;
-        }
-        else {
-            markerMap.set(name, marker);
-            markers.push(marker);
-            return marker;
-        }
-    }
-    function parseFileContent(content, fileName, markerMap, markers, ranges) {
-        content = chompLeadingSpace(content);
-        // Any slash-star comment with a character not in this string is not a marker.
-        var validMarkerChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz$1234567890_";
-        /// The file content (minus metacharacters) so far
-        var output = "";
-        /// The current marker (or maybe multi-line comment?) we're parsing, possibly
-        var openMarker;
-        /// A stack of the open range markers that are still unclosed
-        var openRanges = [];
-        /// A list of ranges we've collected so far */
-        var localRanges = [];
-        /// The latest position of the start of an unflushed plain text area
-        var lastNormalCharPosition = 0;
-        /// The total number of metacharacters removed from the file (so far)
-        var difference = 0;
-        /// The fourslash file state object we are generating
-        var state = 0 /* none */;
-        /// Current position data
-        var line = 1;
-        var column = 1;
-        var flush = function (lastSafeCharIndex) {
-            output = output + content.substr(lastNormalCharPosition, lastSafeCharIndex === undefined ? undefined : lastSafeCharIndex - lastNormalCharPosition);
-        };
-        if (content.length > 0) {
-            var previousChar = content.charAt(0);
-            for (var i = 1; i < content.length; i++) {
-                var currentChar = content.charAt(i);
-                switch (state) {
-                    case 0 /* none */:
-                        if (previousChar === "[" && currentChar === "|") {
-                            // found a range start
-                            openRanges.push({
-                                position: (i - 1) - difference,
-                                sourcePosition: i - 1,
-                                sourceLine: line,
-                                sourceColumn: column,
-                            });
-                            // copy all text up to marker position
-                            flush(i - 1);
-                            lastNormalCharPosition = i + 1;
-                            difference += 2;
-                        }
-                        else if (previousChar === "|" && currentChar === "]") {
-                            // found a range end
-                            var rangeStart = openRanges.pop();
-                            if (!rangeStart) {
-                                throw reportError(fileName, line, column, "Found range end with no matching start.");
-                            }
-                            var range = {
-                                fileName: fileName,
-                                pos: rangeStart.position,
-                                end: (i - 1) - difference,
-                                marker: rangeStart.marker
-                            };
-                            localRanges.push(range);
-                            // copy all text up to range marker position
-                            flush(i - 1);
-                            lastNormalCharPosition = i + 1;
-                            difference += 2;
-                        }
-                        else if (previousChar === "/" && currentChar === "*") {
-                            // found a possible marker start
-                            state = 1 /* inSlashStarMarker */;
-                            openMarker = {
-                                position: (i - 1) - difference,
-                                sourcePosition: i - 1,
-                                sourceLine: line,
-                                sourceColumn: column,
-                            };
-                        }
-                        else if (previousChar === "{" && currentChar === "|") {
-                            // found an object marker start
-                            state = 2 /* inObjectMarker */;
-                            openMarker = {
-                                position: (i - 1) - difference,
-                                sourcePosition: i - 1,
-                                sourceLine: line,
-                                sourceColumn: column,
-                            };
-                            flush(i - 1);
-                        }
-                        break;
-                    case 2 /* inObjectMarker */:
-                        // Object markers are only ever terminated by |} and have no content restrictions
-                        if (previousChar === "|" && currentChar === "}") {
-                            // Record the marker
-                            var objectMarkerNameText = content.substring(openMarker.sourcePosition + 2, i - 1).trim();
-                            var marker = recordObjectMarker(fileName, openMarker, objectMarkerNameText, markerMap, markers);
-                            if (openRanges.length > 0) {
-                                openRanges[openRanges.length - 1].marker = marker;
-                            }
-                            // Set the current start to point to the end of the current marker to ignore its text
-                            lastNormalCharPosition = i + 1;
-                            difference += i + 1 - openMarker.sourcePosition;
-                            // Reset the state
-                            openMarker = undefined;
-                            state = 0 /* none */;
-                        }
-                        break;
-                    case 1 /* inSlashStarMarker */:
-                        if (previousChar === "*" && currentChar === "/") {
-                            // Record the marker
-                            // start + 2 to ignore the */, -1 on the end to ignore the * (/ is next)
-                            var markerNameText = content.substring(openMarker.sourcePosition + 2, i - 1).trim();
-                            var marker = recordMarker(fileName, openMarker, markerNameText, markerMap, markers);
-                            if (openRanges.length > 0) {
-                                openRanges[openRanges.length - 1].marker = marker;
-                            }
-                            // Set the current start to point to the end of the current marker to ignore its text
-                            flush(openMarker.sourcePosition);
-                            lastNormalCharPosition = i + 1;
-                            difference += i + 1 - openMarker.sourcePosition;
-                            // Reset the state
-                            openMarker = undefined;
-                            state = 0 /* none */;
-                        }
-                        else if (validMarkerChars.indexOf(currentChar) < 0) {
-                            if (currentChar === "*" && i < content.length - 1 && content.charAt(i + 1) === "/") {
-                                // The marker is about to be closed, ignore the 'invalid' char
-                            }
-                            else {
-                                // We've hit a non-valid marker character, so we were actually in a block comment
-                                // Bail out the text we've gathered so far back into the output
-                                flush(i);
-                                lastNormalCharPosition = i;
-                                openMarker = undefined;
-                                state = 0 /* none */;
-                            }
-                        }
-                        break;
-                }
-                if (currentChar === "\n" && previousChar === "\r") {
-                    // Ignore trailing \n after a \r
-                    continue;
-                }
-                else if (currentChar === "\n" || currentChar === "\r") {
-                    line++;
-                    column = 1;
-                    continue;
-                }
-                column++;
-                previousChar = currentChar;
-            }
-        }
-        // Add the remaining text
-        flush(/*lastSafeCharIndex*/ undefined);
-        if (openRanges.length > 0) {
-            var openRange = openRanges[0];
-            reportError(fileName, openRange.sourceLine, openRange.sourceColumn, "Unterminated range.");
-        }
-        if (openMarker) {
-            reportError(fileName, openMarker.sourceLine, openMarker.sourceColumn, "Unterminated marker.");
-        }
-        // put ranges in the correct order
-        localRanges = localRanges.sort(function (a, b) { return a.pos < b.pos ? -1 : 1; });
-        localRanges.forEach(function (r) { ranges.push(r); });
-        return {
-            content: output,
-            fileOptions: {},
-            version: 0,
-            fileName: fileName,
-        };
-    }
-    function stringify(data, replacer) {
-        return JSON.stringify(data, replacer, 2);
-    }
-    /** Collects an array of unique outputs. */
-    function unique(inputs, getOutput) {
-        var set = ts.createMap();
-        for (var _i = 0, inputs_2 = inputs; _i < inputs_2.length; _i++) {
-            var input = inputs_2[_i];
-            var out = getOutput(input);
-            set.set(out, true);
-        }
-        return ts.arrayFrom(set.keys());
-    }
-    function toArray(x) {
-        return ts.isArray(x) ? x : [x];
-    }
-    function makeWhitespaceVisible(text) {
-        return text.replace(/ /g, "\u00B7").replace(/\r/g, "\u00B6").replace(/\n/g, "\u2193\n").replace(/\t/g, "\u2192\   ");
-    }
-    function showTextDiff(expected, actual) {
-        // Only show whitespace if the difference is whitespace-only.
-        if (differOnlyByWhitespace(expected, actual)) {
-            expected = makeWhitespaceVisible(expected);
-            actual = makeWhitespaceVisible(actual);
-        }
-        return "Expected:\n" + expected + "\nActual:\n" + actual;
-    }
-    function differOnlyByWhitespace(a, b) {
-        return stripWhitespace(a) === stripWhitespace(b);
-    }
-    function stripWhitespace(s) {
-        return s.replace(/\s/g, "");
-    }
-    function findDuplicatedElement(a, equal) {
-        for (var i = 0; i < a.length; i++) {
-            for (var j = i + 1; j < a.length; j++) {
-                if (equal(a[i], a[j])) {
-                    return a[i];
-                }
-            }
-        }
-    }
-})(FourSlash || (FourSlash = {}));
-var FourSlashInterface;
-(function (FourSlashInterface) {
-    var Test = /** @class */ (function () {
-        function Test(state) {
-            this.state = state;
-        }
-        Test.prototype.markers = function () {
-            return this.state.getMarkers();
-        };
-        Test.prototype.markerNames = function () {
-            return this.state.getMarkerNames();
-        };
-        Test.prototype.marker = function (name) {
-            return this.state.getMarkerByName(name);
-        };
-        Test.prototype.markerName = function (m) {
-            return this.state.markerName(m);
-        };
-        Test.prototype.ranges = function () {
-            return this.state.getRanges();
-        };
-        Test.prototype.spans = function () {
-            return this.ranges().map(function (r) { return ts.createTextSpan(r.pos, r.end - r.pos); });
-        };
-        Test.prototype.rangesByText = function () {
-            return this.state.rangesByText();
-        };
-        Test.prototype.markerByName = function (s) {
-            return this.state.getMarkerByName(s);
-        };
-        Test.prototype.symbolsInScope = function (range) {
-            return this.state.symbolsInScope(range);
-        };
-        Test.prototype.setTypesRegistry = function (map) {
-            this.state.setTypesRegistry(map);
-        };
-        return Test;
-    }());
-    FourSlashInterface.Test = Test;
-    var GoTo = /** @class */ (function () {
-        function GoTo(state) {
-            this.state = state;
-        }
-        // Moves the caret to the specified marker,
-        // or the anonymous marker ('/**/') if no name
-        // is given
-        GoTo.prototype.marker = function (name) {
-            this.state.goToMarker(name);
-        };
-        GoTo.prototype.eachMarker = function (a, b) {
-            var _this = this;
-            var markers = typeof a === "function" ? this.state.getMarkers() : a.map(function (m) { return _this.state.getMarkerByName(m); });
-            this.state.goToEachMarker(markers, typeof a === "function" ? a : b);
-        };
-        GoTo.prototype.rangeStart = function (range) {
-            this.state.goToRangeStart(range);
-        };
-        GoTo.prototype.eachRange = function (action) {
-            this.state.goToEachRange(action);
-        };
-        GoTo.prototype.bof = function () {
-            this.state.goToBOF();
-        };
-        GoTo.prototype.eof = function () {
-            this.state.goToEOF();
-        };
-        GoTo.prototype.implementation = function () {
-            this.state.goToImplementation();
-        };
-        GoTo.prototype.position = function (position, fileNameOrIndex) {
-            if (fileNameOrIndex !== undefined) {
-                this.file(fileNameOrIndex);
-            }
-            this.state.goToPosition(position);
-        };
-        // Opens a file, given either its index as it
-        // appears in the test source, or its filename
-        // as specified in the test metadata
-        GoTo.prototype.file = function (indexOrName, content, scriptKindName) {
-            this.state.openFile(indexOrName, content, scriptKindName);
-        };
-        GoTo.prototype.select = function (startMarker, endMarker) {
-            this.state.select(startMarker, endMarker);
-        };
-        GoTo.prototype.selectRange = function (range) {
-            this.state.selectRange(range);
-        };
-        return GoTo;
-    }());
-    FourSlashInterface.GoTo = GoTo;
-    var VerifyNegatable = /** @class */ (function () {
-        function VerifyNegatable(state, negative) {
-            if (negative === void 0) { negative = false; }
-            this.state = state;
-            this.negative = negative;
-            this.allowedClassElementKeywords = [
-                "public",
-                "private",
-                "protected",
-                "static",
-                "abstract",
-                "readonly",
-                "get",
-                "set",
-                "constructor",
-                "async"
-            ];
-            this.allowedConstructorParameterKeywords = [
-                "public",
-                "private",
-                "protected",
-                "readonly",
-            ];
-            if (!negative) {
-                this.not = new VerifyNegatable(state, true);
-            }
-        }
-        VerifyNegatable.prototype.completionListCount = function (expectedCount) {
-            this.state.verifyCompletionListCount(expectedCount, this.negative);
-        };
-        // Verifies the completion list contains the specified symbol. The
-        // completion list is brought up if necessary
-        VerifyNegatable.prototype.completionListContains = function (entryId, text, documentation, kind, spanIndex, hasAction, options) {
-            if (typeof entryId === "string") {
-                entryId = { name: entryId, source: undefined };
-            }
-            if (this.negative) {
-                this.state.verifyCompletionListDoesNotContain(entryId, text, documentation, kind, spanIndex, options);
-            }
-            else {
-                this.state.verifyCompletionListContains(entryId, text, documentation, kind, spanIndex, hasAction, options);
-            }
-        };
-        // Verifies the completion list items count to be greater than the specified amount. The
-        // completion list is brought up if necessary
-        VerifyNegatable.prototype.completionListItemsCountIsGreaterThan = function (count) {
-            this.state.verifyCompletionListItemsCountIsGreaterThan(count, this.negative);
-        };
-        VerifyNegatable.prototype.assertHasRanges = function (ranges) {
-            assert(ranges.length !== 0, "Array of ranges is expected to be non-empty");
-        };
-        VerifyNegatable.prototype.completionListIsEmpty = function () {
-            this.state.verifyCompletionListIsEmpty(this.negative);
-        };
-        VerifyNegatable.prototype.completionListContainsClassElementKeywords = function () {
-            for (var _i = 0, _a = this.allowedClassElementKeywords; _i < _a.length; _i++) {
-                var keyword = _a[_i];
-                this.completionListContains(keyword, keyword, /*documentation*/ undefined, "keyword");
-            }
-        };
-        VerifyNegatable.prototype.completionListContainsConstructorParameterKeywords = function () {
-            for (var _i = 0, _a = this.allowedConstructorParameterKeywords; _i < _a.length; _i++) {
-                var keyword = _a[_i];
-                this.completionListContains(keyword, keyword, /*documentation*/ undefined, "keyword");
-            }
-        };
-        VerifyNegatable.prototype.completionListIsGlobal = function (expected) {
-            this.state.verifyCompletionListIsGlobal(expected);
-        };
-        VerifyNegatable.prototype.completionListAllowsNewIdentifier = function () {
-            this.state.verifyCompletionListAllowsNewIdentifier(this.negative);
-        };
-        VerifyNegatable.prototype.noSignatureHelp = function () {
-            var markers = [];
-            for (var _i = 0; _i < arguments.length; _i++) {
-                markers[_i] = arguments[_i];
-            }
-            this.state.verifyNoSignatureHelp(markers);
-        };
-        VerifyNegatable.prototype.signatureHelp = function () {
-            var options = [];
-            for (var _i = 0; _i < arguments.length; _i++) {
-                options[_i] = arguments[_i];
-            }
-            this.state.verifySignatureHelp(options);
-        };
-        VerifyNegatable.prototype.errorExistsBetweenMarkers = function (startMarker, endMarker) {
-            this.state.verifyErrorExistsBetweenMarkers(startMarker, endMarker, !this.negative);
-        };
-        VerifyNegatable.prototype.errorExistsAfterMarker = function (markerName) {
-            if (markerName === void 0) { markerName = ""; }
-            this.state.verifyErrorExistsAfterMarker(markerName, !this.negative, /*after*/ true);
-        };
-        VerifyNegatable.prototype.errorExistsBeforeMarker = function (markerName) {
-            if (markerName === void 0) { markerName = ""; }
-            this.state.verifyErrorExistsAfterMarker(markerName, !this.negative, /*after*/ false);
-        };
-        VerifyNegatable.prototype.quickInfoExists = function () {
-            this.state.verifyQuickInfoExists(this.negative);
-        };
-        VerifyNegatable.prototype.typeDefinitionCountIs = function (expectedCount) {
-            this.state.verifyTypeDefinitionsCount(this.negative, expectedCount);
-        };
-        VerifyNegatable.prototype.implementationListIsEmpty = function () {
-            this.state.verifyImplementationListIsEmpty(this.negative);
-        };
-        VerifyNegatable.prototype.isValidBraceCompletionAtPosition = function (openingBrace) {
-            this.state.verifyBraceCompletionAtPosition(this.negative, openingBrace);
-        };
-        VerifyNegatable.prototype.jsxClosingTag = function (map) {
-            this.state.verifyJsxClosingTag(map);
-        };
-        VerifyNegatable.prototype.isInCommentAtPosition = function (onlyMultiLineDiverges) {
-            this.state.verifySpanOfEnclosingComment(this.negative, onlyMultiLineDiverges);
-        };
-        VerifyNegatable.prototype.codeFix = function (options) {
-            this.state.verifyCodeFix(options);
-        };
-        VerifyNegatable.prototype.codeFixAvailable = function (options) {
-            this.state.verifyCodeFixAvailable(this.negative, options);
-        };
-        VerifyNegatable.prototype.applicableRefactorAvailableAtMarker = function (markerName) {
-            this.state.verifyApplicableRefactorAvailableAtMarker(this.negative, markerName);
-        };
-        VerifyNegatable.prototype.applicableRefactorAvailableForRange = function () {
-            this.state.verifyApplicableRefactorAvailableForRange(this.negative);
-        };
-        VerifyNegatable.prototype.refactor = function (options) {
-            this.state.verifyRefactor(options);
-        };
-        VerifyNegatable.prototype.refactorAvailable = function (name, actionName) {
-            this.state.verifyRefactorAvailable(this.negative, name, actionName);
-        };
-        return VerifyNegatable;
-    }());
-    FourSlashInterface.VerifyNegatable = VerifyNegatable;
-    var Verify = /** @class */ (function (_super) {
-        __extends(Verify, _super);
-        function Verify(state) {
-            return _super.call(this, state) || this;
-        }
-        Verify.prototype.completionsAt = function (markerName, completions, options) {
-            this.state.verifyCompletionsAt(markerName, completions, options);
-        };
-        Verify.prototype.completions = function () {
-            var optionsArray = [];
-            for (var _i = 0; _i < arguments.length; _i++) {
-                optionsArray[_i] = arguments[_i];
-            }
-            for (var _a = 0, optionsArray_1 = optionsArray; _a < optionsArray_1.length; _a++) {
-                var options = optionsArray_1[_a];
-                this.state.verifyCompletions(options);
-            }
-        };
-        Verify.prototype.quickInfoIs = function (expectedText, expectedDocumentation) {
-            this.state.verifyQuickInfoString(expectedText, expectedDocumentation);
-        };
-        Verify.prototype.quickInfoAt = function (markerName, expectedText, expectedDocumentation) {
-            this.state.verifyQuickInfoAt(markerName, expectedText, expectedDocumentation);
-        };
-        Verify.prototype.quickInfos = function (namesAndTexts) {
-            this.state.verifyQuickInfos(namesAndTexts);
-        };
-        Verify.prototype.caretAtMarker = function (markerName) {
-            this.state.verifyCaretAtMarker(markerName);
-        };
-        Verify.prototype.indentationIs = function (numberOfSpaces) {
-            this.state.verifyIndentationAtCurrentPosition(numberOfSpaces);
-        };
-        Verify.prototype.indentationAtPositionIs = function (fileName, position, numberOfSpaces, indentStyle, baseIndentSize) {
-            if (indentStyle === void 0) { indentStyle = ts.IndentStyle.Smart; }
-            if (baseIndentSize === void 0) { baseIndentSize = 0; }
-            this.state.verifyIndentationAtPosition(fileName, position, numberOfSpaces, indentStyle, baseIndentSize);
-        };
-        Verify.prototype.textAtCaretIs = function (text) {
-            this.state.verifyTextAtCaretIs(text);
-        };
-        /**
-         * Compiles the current file and evaluates 'expr' in a context containing
-         * the emitted output, then compares (using ===) the result of that expression
-         * to 'value'. Do not use this function with external modules as it is not supported.
-         */
-        Verify.prototype.eval = function (expr, value) {
-            this.state.verifyEval(expr, value);
-        };
-        Verify.prototype.currentLineContentIs = function (text) {
-            this.state.verifyCurrentLineContent(text);
-        };
-        Verify.prototype.currentFileContentIs = function (text) {
-            this.state.verifyCurrentFileContent(text);
-        };
-        Verify.prototype.goToDefinitionIs = function (endMarkers) {
-            this.state.verifyGoToDefinitionIs(endMarkers);
-        };
-        Verify.prototype.goToDefinition = function (arg0, endMarkerName) {
-            this.state.verifyGoToDefinition(arg0, endMarkerName);
-        };
-        Verify.prototype.goToType = function (arg0, endMarkerName) {
-            this.state.verifyGoToType(arg0, endMarkerName);
-        };
-        Verify.prototype.goToDefinitionForMarkers = function () {
-            var markerNames = [];
-            for (var _i = 0; _i < arguments.length; _i++) {
-                markerNames[_i] = arguments[_i];
-            }
-            this.state.verifyGoToDefinitionForMarkers(markerNames);
-        };
-        Verify.prototype.goToDefinitionName = function (name, containerName) {
-            this.state.verifyGoToDefinitionName(name, containerName);
-        };
-        Verify.prototype.verifyGetEmitOutputForCurrentFile = function (expected) {
-            this.state.verifyGetEmitOutputForCurrentFile(expected);
-        };
-        Verify.prototype.verifyGetEmitOutputContentsForCurrentFile = function (expected) {
-            this.state.verifyGetEmitOutputContentsForCurrentFile(expected);
-        };
-        Verify.prototype.symbolAtLocation = function (startRange) {
-            var declarationRanges = [];
-            for (var _i = 1; _i < arguments.length; _i++) {
-                declarationRanges[_i - 1] = arguments[_i];
-            }
-            this.state.verifySymbolAtLocation(startRange, declarationRanges);
-        };
-        Verify.prototype.typeOfSymbolAtLocation = function (range, symbol, expected) {
-            this.state.verifyTypeOfSymbolAtLocation(range, symbol, expected);
-        };
-        Verify.prototype.referenceGroups = function (starts, parts) {
-            this.state.verifyReferenceGroups(starts, parts);
-        };
-        Verify.prototype.noReferences = function (markerNameOrRange) {
-            this.state.verifyNoReferences(markerNameOrRange);
-        };
-        Verify.prototype.getReferencesForServerTest = function (expected) {
-            this.state.verifyGetReferencesForServerTest(expected);
-        };
-        Verify.prototype.singleReferenceGroup = function (definition, ranges) {
-            this.state.verifySingleReferenceGroup(definition, ranges);
-        };
-        Verify.prototype.findReferencesDefinitionDisplayPartsAtCaretAre = function (expected) {
-            this.state.verifyDisplayPartsOfReferencedSymbol(expected);
-        };
-        Verify.prototype.noErrors = function () {
-            this.state.verifyNoErrors();
-        };
-        Verify.prototype.numberOfErrorsInCurrentFile = function (expected) {
-            this.state.verifyNumberOfErrorsInCurrentFile(expected);
-        };
-        Verify.prototype.baselineCurrentFileBreakpointLocations = function () {
-            this.state.baselineCurrentFileBreakpointLocations();
-        };
-        Verify.prototype.baselineCurrentFileNameOrDottedNameSpans = function () {
-            this.state.baselineCurrentFileNameOrDottedNameSpans();
-        };
-        Verify.prototype.baselineGetEmitOutput = function (insertResultsIntoVfs) {
-            this.state.baselineGetEmitOutput(insertResultsIntoVfs);
-        };
-        Verify.prototype.baselineQuickInfo = function () {
-            this.state.baselineQuickInfo();
-        };
-        Verify.prototype.nameOrDottedNameSpanTextIs = function (text) {
-            this.state.verifyCurrentNameOrDottedNameSpanText(text);
-        };
-        Verify.prototype.outliningSpansInCurrentFile = function (spans, kind) {
-            this.state.verifyOutliningSpans(spans, kind);
-        };
-        Verify.prototype.todoCommentsInCurrentFile = function (descriptors) {
-            this.state.verifyTodoComments(descriptors, this.state.getRanges());
-        };
-        Verify.prototype.matchingBracePositionInCurrentFile = function (bracePosition, expectedMatchPosition) {
-            this.state.verifyMatchingBracePosition(bracePosition, expectedMatchPosition);
-        };
-        Verify.prototype.noMatchingBracePositionInCurrentFile = function (bracePosition) {
-            this.state.verifyNoMatchingBracePosition(bracePosition);
-        };
-        Verify.prototype.docCommentTemplateAt = function (marker, expectedOffset, expectedText) {
-            this.state.goToMarker(marker);
-            this.state.verifyDocCommentTemplate({ newText: expectedText.replace(/\r?\n/g, "\r\n"), caretOffset: expectedOffset });
-        };
-        Verify.prototype.noDocCommentTemplateAt = function (marker) {
-            this.state.goToMarker(marker);
-            this.state.verifyDocCommentTemplate(/*expected*/ undefined);
-        };
-        Verify.prototype.rangeAfterCodeFix = function (expectedText, includeWhiteSpace, errorCode, index) {
-            this.state.verifyRangeAfterCodeFix(expectedText, includeWhiteSpace, errorCode, index);
-        };
-        Verify.prototype.codeFixAll = function (options) {
-            this.state.verifyCodeFixAll(options);
-        };
-        Verify.prototype.fileAfterApplyingRefactorAtMarker = function (markerName, expectedContent, refactorNameToApply, actionName, formattingOptions) {
-            this.state.verifyFileAfterApplyingRefactorAtMarker(markerName, expectedContent, refactorNameToApply, actionName, formattingOptions);
-        };
-        Verify.prototype.rangeIs = function (expectedText, includeWhiteSpace) {
-            this.state.verifyRangeIs(expectedText, includeWhiteSpace);
-        };
-        Verify.prototype.getAndApplyCodeFix = function (errorCode, index) {
-            this.state.getAndApplyCodeActions(errorCode, index);
-        };
-        Verify.prototype.applyCodeActionFromCompletion = function (markerName, options) {
-            this.state.applyCodeActionFromCompletion(markerName, options);
-        };
-        Verify.prototype.importFixAtPosition = function (expectedTextArray, errorCode, preferences) {
-            this.state.verifyImportFixAtPosition(expectedTextArray, errorCode, preferences);
-        };
-        Verify.prototype.navigationBar = function (json, options) {
-            this.state.verifyNavigationBar(json, options);
-        };
-        Verify.prototype.navigationTree = function (json, options) {
-            this.state.verifyNavigationTree(json, options);
-        };
-        Verify.prototype.navigationItemsListCount = function (count, searchValue, matchKind, fileName) {
-            this.state.verifyNavigationItemsCount(count, searchValue, matchKind, fileName);
-        };
-        Verify.prototype.navigationItemsListContains = function (name, kind, searchValue, matchKind, fileName, parentName) {
-            this.state.verifyNavigationItemsListContains(name, kind, searchValue, matchKind, fileName, parentName);
-        };
-        Verify.prototype.occurrencesAtPositionContains = function (range, isWriteAccess) {
-            this.state.verifyOccurrencesAtPositionListContains(range.fileName, range.pos, range.end, isWriteAccess);
-        };
-        Verify.prototype.occurrencesAtPositionCount = function (expectedCount) {
-            this.state.verifyOccurrencesAtPositionListCount(expectedCount);
-        };
-        Verify.prototype.rangesAreOccurrences = function (isWriteAccess) {
-            this.state.verifyRangesAreOccurrences(isWriteAccess);
-        };
-        Verify.prototype.rangesWithSameTextAreRenameLocations = function () {
-            this.state.verifyRangesWithSameTextAreRenameLocations();
-        };
-        Verify.prototype.rangesAreRenameLocations = function (options) {
-            this.state.verifyRangesAreRenameLocations(options);
-        };
-        Verify.prototype.rangesAreDocumentHighlights = function (ranges, options) {
-            this.state.verifyRangesAreDocumentHighlights(ranges, options);
-        };
-        Verify.prototype.rangesWithSameTextAreDocumentHighlights = function () {
-            this.state.verifyRangesWithSameTextAreDocumentHighlights();
-        };
-        Verify.prototype.documentHighlightsOf = function (startRange, ranges, options) {
-            this.state.verifyDocumentHighlightsOf(startRange, ranges, options);
-        };
-        Verify.prototype.noDocumentHighlights = function (startRange) {
-            this.state.verifyNoDocumentHighlights(startRange);
-        };
-        Verify.prototype.completionEntryDetailIs = function (entryName, text, documentation, kind, tags) {
-            this.state.verifyCompletionEntryDetails(entryName, text, documentation, kind, tags);
-        };
-        /**
-         * This method *requires* a contiguous, complete, and ordered stream of classifications for a file.
-         */
-        Verify.prototype.syntacticClassificationsAre = function () {
-            var classifications = [];
-            for (var _i = 0; _i < arguments.length; _i++) {
-                classifications[_i] = arguments[_i];
-            }
-            this.state.verifySyntacticClassifications(classifications);
-        };
-        /**
-         * This method *requires* an ordered stream of classifications for a file, and spans are highly recommended.
-         */
-        Verify.prototype.semanticClassificationsAre = function () {
-            var classifications = [];
-            for (var _i = 0; _i < arguments.length; _i++) {
-                classifications[_i] = arguments[_i];
-            }
-            this.state.verifySemanticClassifications(classifications);
-        };
-        Verify.prototype.renameInfoSucceeded = function (displayName, fullDisplayName, kind, kindModifiers) {
-            this.state.verifyRenameInfoSucceeded(displayName, fullDisplayName, kind, kindModifiers);
-        };
-        Verify.prototype.renameInfoFailed = function (message) {
-            this.state.verifyRenameInfoFailed(message);
-        };
-        Verify.prototype.renameLocations = function (startRanges, options) {
-            this.state.verifyRenameLocations(startRanges, options);
-        };
-        Verify.prototype.verifyQuickInfoDisplayParts = function (kind, kindModifiers, textSpan, displayParts, documentation, tags) {
-            this.state.verifyQuickInfoDisplayParts(kind, kindModifiers, textSpan, displayParts, documentation, tags);
-        };
-        Verify.prototype.getSyntacticDiagnostics = function (expected) {
-            this.state.getSyntacticDiagnostics(expected);
-        };
-        Verify.prototype.getSemanticDiagnostics = function (expected) {
-            this.state.getSemanticDiagnostics(expected);
-        };
-        Verify.prototype.getSuggestionDiagnostics = function (expected) {
-            this.state.getSuggestionDiagnostics(expected);
-        };
-        Verify.prototype.ProjectInfo = function (expected) {
-            this.state.verifyProjectInfo(expected);
-        };
-        Verify.prototype.allRangesAppearInImplementationList = function (markerName) {
-            this.state.verifyRangesInImplementationList(markerName);
-        };
-        Verify.prototype.getEditsForFileRename = function (options) {
-            this.state.getEditsForFileRename(options);
-        };
-        Verify.prototype.moveToNewFile = function (options) {
-            this.state.moveToNewFile(options);
-        };
-        Verify.prototype.noMoveToNewFile = function () {
-            this.state.noMoveToNewFile();
-        };
-        return Verify;
-    }(VerifyNegatable));
-    FourSlashInterface.Verify = Verify;
-    var Edit = /** @class */ (function () {
-        function Edit(state) {
-            this.state = state;
-        }
-        Edit.prototype.backspace = function (count) {
-            this.state.deleteCharBehindMarker(count);
-        };
-        Edit.prototype.deleteAtCaret = function (times) {
-            this.state.deleteChar(times);
-        };
-        Edit.prototype.replace = function (start, length, text) {
-            this.state.replace(start, length, text);
-        };
-        Edit.prototype.paste = function (text) {
-            this.state.paste(text);
-        };
-        Edit.prototype.insert = function (text) {
-            this.insertLines(text);
-        };
-        Edit.prototype.insertLine = function (text) {
-            this.insertLines(text + "\n");
-        };
-        Edit.prototype.insertLines = function () {
-            var lines = [];
-            for (var _i = 0; _i < arguments.length; _i++) {
-                lines[_i] = arguments[_i];
-            }
-            this.state.type(lines.join("\n"));
-        };
-        Edit.prototype.moveRight = function (count) {
-            this.state.moveCaretRight(count);
-        };
-        Edit.prototype.moveLeft = function (count) {
-            if (typeof count === "undefined") {
-                count = 1;
-            }
-            this.state.moveCaretRight(count * -1);
-        };
-        Edit.prototype.enableFormatting = function () {
-            this.state.enableFormatting = true;
-        };
-        Edit.prototype.disableFormatting = function () {
-            this.state.enableFormatting = false;
-        };
-        Edit.prototype.applyRefactor = function (options) {
-            this.state.applyRefactor(options);
-        };
-        return Edit;
-    }());
-    FourSlashInterface.Edit = Edit;
-    var Debug = /** @class */ (function () {
-        function Debug(state) {
-            this.state = state;
-        }
-        Debug.prototype.printCurrentParameterHelp = function () {
-            this.state.printCurrentParameterHelp();
-        };
-        Debug.prototype.printCurrentFileState = function () {
-            this.state.printCurrentFileState(/*showWhitespace*/ false, /*makeCaretVisible*/ true);
-        };
-        Debug.prototype.printCurrentFileStateWithWhitespace = function () {
-            this.state.printCurrentFileState(/*showWhitespace*/ true, /*makeCaretVisible*/ true);
-        };
-        Debug.prototype.printCurrentFileStateWithoutCaret = function () {
-            this.state.printCurrentFileState(/*showWhitespace*/ false, /*makeCaretVisible*/ false);
-        };
-        Debug.prototype.printCurrentQuickInfo = function () {
-            this.state.printCurrentQuickInfo();
-        };
-        Debug.prototype.printCurrentSignatureHelp = function () {
-            this.state.printCurrentSignatureHelp();
-        };
-        Debug.prototype.printCompletionListMembers = function (options) {
-            this.state.printCompletionListMembers(options);
-        };
-        Debug.prototype.printAvailableCodeFixes = function () {
-            this.state.printAvailableCodeFixes();
-        };
-        Debug.prototype.printBreakpointLocation = function (pos) {
-            this.state.printBreakpointLocation(pos);
-        };
-        Debug.prototype.printBreakpointAtCurrentLocation = function () {
-            this.state.printBreakpointAtCurrentLocation();
-        };
-        Debug.prototype.printNameOrDottedNameSpans = function (pos) {
-            this.state.printNameOrDottedNameSpans(pos);
-        };
-        Debug.prototype.printErrorList = function () {
-            this.state.printErrorList();
-        };
-        Debug.prototype.printNavigationItems = function (searchValue) {
-            if (searchValue === void 0) { searchValue = ".*"; }
-            this.state.printNavigationItems(searchValue);
-        };
-        Debug.prototype.printNavigationBar = function () {
-            this.state.printNavigationBar();
-        };
-        Debug.prototype.printContext = function () {
-            this.state.printContext();
-        };
-        Debug.prototype.printOutliningSpans = function () {
-            this.state.printOutliningSpans();
-        };
-        return Debug;
-    }());
-    FourSlashInterface.Debug = Debug;
-    var Format = /** @class */ (function () {
-        function Format(state) {
-            this.state = state;
-        }
-        Format.prototype.document = function () {
-            this.state.formatDocument();
-        };
-        Format.prototype.copyFormatOptions = function () {
-            return this.state.copyFormatOptions();
-        };
-        Format.prototype.setFormatOptions = function (options) {
-            return this.state.setFormatOptions(options);
-        };
-        Format.prototype.selection = function (startMarker, endMarker) {
-            this.state.formatSelection(this.state.getMarkerByName(startMarker).position, this.state.getMarkerByName(endMarker).position);
-        };
-        Format.prototype.onType = function (posMarker, key) {
-            this.state.formatOnType(this.state.getMarkerByName(posMarker).position, key);
-        };
-        Format.prototype.setOption = function (name, value) {
-            this.state.formatCodeSettings[name] = value;
-        };
-        return Format;
-    }());
-    FourSlashInterface.Format = Format;
-    var Cancellation = /** @class */ (function () {
-        function Cancellation(state) {
-            this.state = state;
-        }
-        Cancellation.prototype.resetCancelled = function () {
-            this.state.resetCancelled();
-        };
-        Cancellation.prototype.setCancelled = function (numberOfCalls) {
-            if (numberOfCalls === void 0) { numberOfCalls = 0; }
-            this.state.setCancelled(numberOfCalls);
-        };
-        return Cancellation;
-    }());
-    FourSlashInterface.Cancellation = Cancellation;
-    var Classification;
-    (function (Classification) {
-        function comment(text, position) {
-            return getClassification("comment" /* comment */, text, position);
-        }
-        Classification.comment = comment;
-        function identifier(text, position) {
-            return getClassification("identifier" /* identifier */, text, position);
-        }
-        Classification.identifier = identifier;
-        function keyword(text, position) {
-            return getClassification("keyword" /* keyword */, text, position);
-        }
-        Classification.keyword = keyword;
-        function numericLiteral(text, position) {
-            return getClassification("number" /* numericLiteral */, text, position);
-        }
-        Classification.numericLiteral = numericLiteral;
-        function operator(text, position) {
-            return getClassification("operator" /* operator */, text, position);
-        }
-        Classification.operator = operator;
-        function stringLiteral(text, position) {
-            return getClassification("string" /* stringLiteral */, text, position);
-        }
-        Classification.stringLiteral = stringLiteral;
-        function whiteSpace(text, position) {
-            return getClassification("whitespace" /* whiteSpace */, text, position);
-        }
-        Classification.whiteSpace = whiteSpace;
-        function text(text, position) {
-            return getClassification("text" /* text */, text, position);
-        }
-        Classification.text = text;
-        function punctuation(text, position) {
-            return getClassification("punctuation" /* punctuation */, text, position);
-        }
-        Classification.punctuation = punctuation;
-        function docCommentTagName(text, position) {
-            return getClassification("doc comment tag name" /* docCommentTagName */, text, position);
-        }
-        Classification.docCommentTagName = docCommentTagName;
-        function className(text, position) {
-            return getClassification("class name" /* className */, text, position);
-        }
-        Classification.className = className;
-        function enumName(text, position) {
-            return getClassification("enum name" /* enumName */, text, position);
-        }
-        Classification.enumName = enumName;
-        function interfaceName(text, position) {
-            return getClassification("interface name" /* interfaceName */, text, position);
-        }
-        Classification.interfaceName = interfaceName;
-        function moduleName(text, position) {
-            return getClassification("module name" /* moduleName */, text, position);
-        }
-        Classification.moduleName = moduleName;
-        function typeParameterName(text, position) {
-            return getClassification("type parameter name" /* typeParameterName */, text, position);
-        }
-        Classification.typeParameterName = typeParameterName;
-        function parameterName(text, position) {
-            return getClassification("parameter name" /* parameterName */, text, position);
-        }
-        Classification.parameterName = parameterName;
-        function typeAliasName(text, position) {
-            return getClassification("type alias name" /* typeAliasName */, text, position);
-        }
-        Classification.typeAliasName = typeAliasName;
-        function jsxOpenTagName(text, position) {
-            return getClassification("jsx open tag name" /* jsxOpenTagName */, text, position);
-        }
-        Classification.jsxOpenTagName = jsxOpenTagName;
-        function jsxCloseTagName(text, position) {
-            return getClassification("jsx close tag name" /* jsxCloseTagName */, text, position);
-        }
-        Classification.jsxCloseTagName = jsxCloseTagName;
-        function jsxSelfClosingTagName(text, position) {
-            return getClassification("jsx self closing tag name" /* jsxSelfClosingTagName */, text, position);
-        }
-        Classification.jsxSelfClosingTagName = jsxSelfClosingTagName;
-        function jsxAttribute(text, position) {
-            return getClassification("jsx attribute" /* jsxAttribute */, text, position);
-        }
-        Classification.jsxAttribute = jsxAttribute;
-        function jsxText(text, position) {
-            return getClassification("jsx text" /* jsxText */, text, position);
-        }
-        Classification.jsxText = jsxText;
-        function jsxAttributeStringLiteralValue(text, position) {
-            return getClassification("jsx attribute string literal value" /* jsxAttributeStringLiteralValue */, text, position);
-        }
-        Classification.jsxAttributeStringLiteralValue = jsxAttributeStringLiteralValue;
-        function getClassification(classificationType, text, position) {
-            var textSpan = position === undefined ? undefined : { start: position, end: position + text.length };
-            return { classificationType: classificationType, text: text, textSpan: textSpan };
-        }
-    })(Classification = FourSlashInterface.Classification || (FourSlashInterface.Classification = {}));
-})(FourSlashInterface || (FourSlashInterface = {}));
-var TypeWriterWalker = /** @class */ (function () {
-    function TypeWriterWalker(program, fullTypeCheck) {
-        this.program = program;
-        // Consider getting both the diagnostics checker and the non-diagnostics checker to verify
-        // they are consistent.
-        this.checker = fullTypeCheck
-            ? program.getDiagnosticsProducingTypeChecker()
-            : program.getTypeChecker();
-    }
-    TypeWriterWalker.prototype.getSymbols = function (fileName) {
-        var _a, sourceFile, gen, _b, done, value;
-        return __generator(this, function (_c) {
-            switch (_c.label) {
-                case 0:
-                    sourceFile = this.program.getSourceFile(fileName);
-                    this.currentSourceFile = sourceFile;
-                    gen = this.visitNode(sourceFile, /*isSymbolWalk*/ true);
-                    _b = gen.next(), done = _b.done, value = _b.value;
-                    _c.label = 1;
-                case 1:
-                    if (!!done) return [3 /*break*/, 4];
-                    return [4 /*yield*/, value];
-                case 2:
-                    _c.sent();
-                    _c.label = 3;
-                case 3:
-                    _a = gen.next(), done = _a.done, value = _a.value, _a;
-                    return [3 /*break*/, 1];
-                case 4: return [2 /*return*/];
-            }
-        });
-    };
-    TypeWriterWalker.prototype.getTypes = function (fileName) {
-        var _a, sourceFile, gen, _b, done, value;
-        return __generator(this, function (_c) {
-            switch (_c.label) {
-                case 0:
-                    sourceFile = this.program.getSourceFile(fileName);
-                    this.currentSourceFile = sourceFile;
-                    gen = this.visitNode(sourceFile, /*isSymbolWalk*/ false);
-                    _b = gen.next(), done = _b.done, value = _b.value;
-                    _c.label = 1;
-                case 1:
-                    if (!!done) return [3 /*break*/, 4];
-                    return [4 /*yield*/, value];
-                case 2:
-                    _c.sent();
-                    _c.label = 3;
-                case 3:
-                    _a = gen.next(), done = _a.done, value = _a.value, _a;
-                    return [3 /*break*/, 1];
-                case 4: return [2 /*return*/];
-            }
-        });
-    };
-    TypeWriterWalker.prototype.visitNode = function (node, isSymbolWalk) {
-        var _a, result, children, _i, children_1, child, gen, _b, done, value;
-        return __generator(this, function (_c) {
-            switch (_c.label) {
-                case 0:
-                    if (!(ts.isExpressionNode(node) || node.kind === 71 /* Identifier */ || ts.isDeclarationName(node))) return [3 /*break*/, 2];
-                    result = this.writeTypeOrSymbol(node, isSymbolWalk);
-                    if (!result) return [3 /*break*/, 2];
-                    return [4 /*yield*/, result];
-                case 1:
-                    _c.sent();
-                    _c.label = 2;
-                case 2:
-                    children = [];
-                    ts.forEachChild(node, function (child) { return void children.push(child); });
-                    _i = 0, children_1 = children;
-                    _c.label = 3;
-                case 3:
-                    if (!(_i < children_1.length)) return [3 /*break*/, 8];
-                    child = children_1[_i];
-                    gen = this.visitNode(child, isSymbolWalk);
-                    _b = gen.next(), done = _b.done, value = _b.value;
-                    _c.label = 4;
-                case 4:
-                    if (!!done) return [3 /*break*/, 7];
-                    return [4 /*yield*/, value];
-                case 5:
-                    _c.sent();
-                    _c.label = 6;
-                case 6:
-                    _a = gen.next(), done = _a.done, value = _a.value, _a;
-                    return [3 /*break*/, 4];
-                case 7:
-                    _i++;
-                    return [3 /*break*/, 3];
-                case 8: return [2 /*return*/];
-            }
-        });
-    };
-    TypeWriterWalker.prototype.writeTypeOrSymbol = function (node, isSymbolWalk) {
-        var actualPos = ts.skipTrivia(this.currentSourceFile.text, node.pos);
-        var lineAndCharacter = this.currentSourceFile.getLineAndCharacterOfPosition(actualPos);
-        var sourceText = ts.getSourceTextOfNodeFromSourceFile(this.currentSourceFile, node);
-        if (!isSymbolWalk) {
-            // Workaround to ensure we output 'C' instead of 'typeof C' for base class expressions
-            // let type = this.checker.getTypeAtLocation(node);
-            var type = node.parent && ts.isExpressionWithTypeArgumentsInClassExtendsClause(node.parent) && this.checker.getTypeAtLocation(node.parent) || this.checker.getTypeAtLocation(node);
-            var typeString = type ? this.checker.typeToString(type, node.parent, 1 /* NoTruncation */ | 1048576 /* AllowUniqueESSymbolType */) : "No type information available!";
-            return {
-                line: lineAndCharacter.line,
-                syntaxKind: node.kind,
-                sourceText: sourceText,
-                type: typeString
-            };
-        }
-        var symbol = this.checker.getSymbolAtLocation(node);
-        if (!symbol) {
-            return;
-        }
-        var symbolString = "Symbol(" + this.checker.symbolToString(symbol, node.parent);
-        if (symbol.declarations) {
-            var count = 0;
-            for (var _i = 0, _a = symbol.declarations; _i < _a.length; _i++) {
-                var declaration = _a[_i];
-                if (count >= 5) {
-                    symbolString += " ... and " + (symbol.declarations.length - count) + " more";
-                    break;
-                }
-                count++;
-                symbolString += ", ";
-                if (declaration.__symbolTestOutputCache) {
-                    symbolString += declaration.__symbolTestOutputCache;
-                    continue;
-                }
-                var declSourceFile = declaration.getSourceFile();
-                var declLineAndCharacter = declSourceFile.getLineAndCharacterOfPosition(declaration.pos);
-                var fileName = ts.getBaseFileName(declSourceFile.fileName);
-                var isLibFile = /lib(.*)\.d\.ts/i.test(fileName);
-                var declText = "Decl(" + fileName + ", " + (isLibFile ? "--" : declLineAndCharacter.line) + ", " + (isLibFile ? "--" : declLineAndCharacter.character) + ")";
-                symbolString += declText;
-                declaration.__symbolTestOutputCache = declText;
-            }
-        }
-        symbolString += ")";
-        return {
-            line: lineAndCharacter.line,
-            syntaxKind: node.kind,
-            sourceText: sourceText,
-            symbol: symbolString
-        };
-    };
-    return TypeWriterWalker;
-}());
-var Playback;
-(function (Playback) {
-    var recordLog;
-    var replayLog;
-    var replayFilesRead;
-    var recordLogFileNameBase = "";
-    function memoize(func) {
-        var lookup = {};
-        var run = (function (s) {
-            if (lookup.hasOwnProperty(s))
-                return lookup[s];
-            return lookup[s] = func(s);
-        });
-        run.reset = function () {
-            lookup = undefined; // TODO: GH#18217
-        };
-        return run;
-    }
-    function createEmptyLog() {
-        return {
-            timestamp: (new Date()).toString(),
-            arguments: [],
-            currentDirectory: "",
-            filesRead: [],
-            directoriesRead: [],
-            filesWritten: [],
-            filesDeleted: [],
-            filesAppended: [],
-            fileExists: [],
-            filesFound: [],
-            dirs: [],
-            dirExists: [],
-            dirsCreated: [],
-            pathsResolved: [],
-            executingPath: ""
-        };
-    }
-    function newStyleLogIntoOldStyleLog(log, host, baseName) {
-        for (var _i = 0, _a = log.filesAppended; _i < _a.length; _i++) {
-            var file = _a[_i];
-            if (file.contentsPath) {
-                file.contents = host.readFile(ts.combinePaths(baseName, file.contentsPath));
-                delete file.contentsPath;
-            }
-        }
-        for (var _b = 0, _c = log.filesWritten; _b < _c.length; _b++) {
-            var file = _c[_b];
-            if (file.contentsPath) {
-                file.contents = host.readFile(ts.combinePaths(baseName, file.contentsPath));
-                delete file.contentsPath;
-            }
-        }
-        for (var _d = 0, _e = log.filesRead; _d < _e.length; _d++) {
-            var file = _e[_d];
-            var result = file.result; // TODO: GH#18217
-            if (result.contentsPath) {
-                // `readFile` strips away a BOM (and actually reinerprets the file contents according to the correct encoding)
-                // - but this has the unfortunate sideeffect of removing the BOM from any outputs based on the file, so we readd it here.
-                result.contents = (result.bom || "") + host.readFile(ts.combinePaths(baseName, result.contentsPath));
-                delete result.contentsPath;
-            }
-        }
-        return log;
-    }
-    Playback.newStyleLogIntoOldStyleLog = newStyleLogIntoOldStyleLog;
-    var canonicalizeForHarness = ts.createGetCanonicalFileName(/*caseSensitive*/ false); // This is done so tests work on windows _and_ linux
-    function sanitizeTestFilePath(name) {
-        var path = ts.toPath(ts.normalizeSlashes(name.replace(/[\^<>:"|?*%]/g, "_")).replace(/\.\.\//g, "__dotdot/"), "", canonicalizeForHarness);
-        if (ts.startsWith(path, "/")) {
-            return path.substring(1);
-        }
-        return path;
-    }
-    function oldStyleLogIntoNewStyleLog(log, writeFile, baseTestName) {
-        if (log.filesAppended) {
-            for (var _i = 0, _a = log.filesAppended; _i < _a.length; _i++) {
-                var file = _a[_i];
-                if (file.contents !== undefined) {
-                    file.contentsPath = ts.combinePaths("appended", sanitizeTestFilePath(file.path));
-                    writeFile(ts.combinePaths(baseTestName, file.contentsPath), file.contents);
-                    delete file.contents;
-                }
-            }
-        }
-        if (log.filesWritten) {
-            for (var _b = 0, _c = log.filesWritten; _b < _c.length; _b++) {
-                var file = _c[_b];
-                if (file.contents !== undefined) {
-                    file.contentsPath = ts.combinePaths("written", sanitizeTestFilePath(file.path));
-                    writeFile(ts.combinePaths(baseTestName, file.contentsPath), file.contents);
-                    delete file.contents;
-                }
-            }
-        }
-        if (log.filesRead) {
-            for (var _d = 0, _e = log.filesRead; _d < _e.length; _d++) {
-                var file = _e[_d];
-                var result = file.result; // TODO: GH#18217
-                var contents = result.contents;
-                if (contents !== undefined) {
-                    result.contentsPath = ts.combinePaths("read", sanitizeTestFilePath(file.path));
-                    writeFile(ts.combinePaths(baseTestName, result.contentsPath), contents);
-                    var len = contents.length;
-                    if (len >= 2 && contents.charCodeAt(0) === 0xfeff) {
-                        result.bom = "\ufeff";
-                    }
-                    if (len >= 2 && contents.charCodeAt(0) === 0xfffe) {
-                        result.bom = "\ufffe";
-                    }
-                    if (len >= 3 && contents.charCodeAt(0) === 0xefbb && contents.charCodeAt(1) === 0xbf) {
-                        result.bom = "\uefbb\xbf";
-                    }
-                    delete result.contents;
-                }
-            }
-        }
-        return log;
-    }
-    Playback.oldStyleLogIntoNewStyleLog = oldStyleLogIntoNewStyleLog;
-    function initWrapper(wrapper, underlying) {
-        ts.forEach(Object.keys(underlying), function (prop) {
-            wrapper[prop] = underlying[prop];
-        });
-        wrapper.startReplayFromString = function (logString) {
-            wrapper.startReplayFromData(JSON.parse(logString));
-        };
-        wrapper.startReplayFromData = function (log) {
-            replayLog = log;
-            // Remove non-found files from the log (shouldn't really need them, but we still record them for diagnostic purposes)
-            replayLog.filesRead = replayLog.filesRead.filter(function (f) { return f.result.contents !== undefined; });
-            replayFilesRead = ts.createMap();
-            for (var _i = 0, _a = replayLog.filesRead; _i < _a.length; _i++) {
-                var file = _a[_i];
-                replayFilesRead.set(ts.normalizeSlashes(file.path).toLowerCase(), file);
-            }
-        };
-        wrapper.endReplay = function () {
-            replayLog = undefined;
-            replayFilesRead = undefined;
-        };
-        wrapper.startRecord = function (fileNameBase) {
-            recordLogFileNameBase = fileNameBase;
-            recordLog = createEmptyLog();
-            recordLog.useCaseSensitiveFileNames = typeof underlying.useCaseSensitiveFileNames === "function" ? underlying.useCaseSensitiveFileNames() : underlying.useCaseSensitiveFileNames;
-            if (typeof underlying.args !== "function") {
-                recordLog.arguments = underlying.args;
-            }
-        };
-        wrapper.startReplayFromFile = function (logFn) {
-            wrapper.startReplayFromString(underlying.readFile(logFn));
-        };
-        wrapper.endRecord = function () {
-            if (recordLog !== undefined) {
-                var i_1 = 0;
-                var getBase = function () { return recordLogFileNameBase + i_1; };
-                while (underlying.fileExists(ts.combinePaths(getBase(), "test.json")))
-                    i_1++;
-                var newLog = oldStyleLogIntoNewStyleLog(recordLog, function (path, str) { return underlying.writeFile(path, str); }, getBase());
-                underlying.writeFile(ts.combinePaths(getBase(), "test.json"), JSON.stringify(newLog, null, 4)); // tslint:disable-line:no-null-keyword
-                var syntheticTsconfig = generateTsconfig(newLog);
-                if (syntheticTsconfig) {
-                    underlying.writeFile(ts.combinePaths(getBase(), "tsconfig.json"), JSON.stringify(syntheticTsconfig, null, 4)); // tslint:disable-line:no-null-keyword
-                }
-                recordLog = undefined;
-            }
-        };
-        function generateTsconfig(newLog) {
-            if (newLog.filesRead.some(function (file) { return /tsconfig.+json$/.test(file.path); })) {
-                return;
-            }
-            var files = [];
-            for (var _i = 0, _a = newLog.filesRead; _i < _a.length; _i++) {
-                var file = _a[_i];
-                var result = file.result;
-                if (result.contentsPath &&
-                    Harness.isDefaultLibraryFile(result.contentsPath) &&
-                    /\.[tj]s$/.test(result.contentsPath)) {
-                    files.push(result.contentsPath);
-                }
-            }
-            return { compilerOptions: ts.parseCommandLine(newLog.arguments).options, files: files };
-        }
-        wrapper.fileExists = recordReplay(wrapper.fileExists, underlying)(function (path) { return callAndRecord(underlying.fileExists(path), recordLog.fileExists, { path: path }); }, memoize(function (path) {
-            // If we read from the file, it must exist
-            if (findFileByPath(path, /*throwFileNotFoundError*/ false)) {
-                return true;
-            }
-            else {
-                return findResultByFields(replayLog.fileExists, { path: path }, /*defaultValue*/ false);
-            }
-        }));
-        wrapper.getExecutingFilePath = function () {
-            if (replayLog !== undefined) {
-                return replayLog.executingPath;
-            }
-            else if (recordLog !== undefined) {
-                return recordLog.executingPath = underlying.getExecutingFilePath();
-            }
-            else {
-                return underlying.getExecutingFilePath();
-            }
-        };
-        wrapper.getCurrentDirectory = function () {
-            if (replayLog !== undefined) {
-                return replayLog.currentDirectory || "";
-            }
-            else if (recordLog !== undefined) {
-                return recordLog.currentDirectory = underlying.getCurrentDirectory();
-            }
-            else {
-                return underlying.getCurrentDirectory();
-            }
-        };
-        wrapper.resolvePath = recordReplay(wrapper.resolvePath, underlying)(function (path) { return callAndRecord(underlying.resolvePath(path), recordLog.pathsResolved, { path: path }); }, memoize(function (path) { return findResultByFields(replayLog.pathsResolved, { path: path }, !ts.isRootedDiskPath(ts.normalizeSlashes(path)) && replayLog.currentDirectory ? replayLog.currentDirectory + "/" + path : ts.normalizeSlashes(path)); }));
-        wrapper.readFile = recordReplay(wrapper.readFile, underlying)(function (path) {
-            var result = underlying.readFile(path);
-            var logEntry = { path: path, codepage: 0, result: { contents: result, codepage: 0 } };
-            recordLog.filesRead.push(logEntry);
-            return result;
-        }, memoize(function (path) { return findFileByPath(path, /*throwFileNotFoundError*/ true).contents; }));
-        wrapper.readDirectory = recordReplay(wrapper.readDirectory, underlying)(function (path, extensions, exclude, include, depth) {
-            var result = underlying.readDirectory(path, extensions, exclude, include, depth);
-            recordLog.directoriesRead.push({ path: path, extensions: extensions, exclude: exclude, include: include, depth: depth, result: result });
-            return result;
-        }, function (path) {
-            // Because extensions is an array of all allowed extension, we will want to merge each of the replayLog.directoriesRead into one
-            // if each of the directoriesRead has matched path with the given path (directory with same path but different extension will considered
-            // different entry).
-            // TODO (yuisu): We can certainly remove these once we recapture the RWC using new API
-            var normalizedPath = ts.normalizePath(path).toLowerCase();
-            return ts.flatMap(replayLog.directoriesRead, function (directory) {
-                if (ts.normalizeSlashes(directory.path).toLowerCase() === normalizedPath) {
-                    return directory.result;
-                }
-            });
-        });
-        wrapper.writeFile = recordReplay(wrapper.writeFile, underlying)(function (path, contents) { return callAndRecord(underlying.writeFile(path, contents), recordLog.filesWritten, { path: path, contents: contents, bom: false }); }, function () { return noOpReplay("writeFile"); });
-        wrapper.exit = function (exitCode) {
-            if (recordLog !== undefined) {
-                wrapper.endRecord();
-            }
-            underlying.exit(exitCode);
-        };
-        wrapper.useCaseSensitiveFileNames = function () {
-            if (replayLog !== undefined) {
-                return !!replayLog.useCaseSensitiveFileNames;
-            }
-            return typeof underlying.useCaseSensitiveFileNames === "function" ? underlying.useCaseSensitiveFileNames() : underlying.useCaseSensitiveFileNames;
-        };
-    }
-    function recordReplay(original, underlying) {
-        function createWrapper(record, replay) {
-            // tslint:disable-next-line only-arrow-functions
-            return (function () {
-                if (replayLog !== undefined) {
-                    return replay.apply(undefined, arguments);
-                }
-                else if (recordLog !== undefined) {
-                    return record.apply(undefined, arguments);
-                }
-                else {
-                    return original.apply(underlying, arguments);
-                }
-            });
-        }
-        return createWrapper;
-    }
-    function callAndRecord(underlyingResult, logArray, logEntry) {
-        if (underlyingResult !== undefined) {
-            logEntry.result = underlyingResult;
-        }
-        logArray.push(logEntry);
-        return underlyingResult;
-    }
-    function findResultByFields(logArray, expectedFields, defaultValue) {
-        var predicate = function (entry) {
-            return Object.getOwnPropertyNames(expectedFields).every(function (name) { return entry[name] === expectedFields[name]; });
-        };
-        var results = logArray.filter(function (entry) { return predicate(entry); });
-        if (results.length === 0) {
-            if (defaultValue !== undefined) {
-                return defaultValue;
-            }
-            else {
-                throw new Error("No matching result in log array for: " + JSON.stringify(expectedFields));
-            }
-        }
-        return results[0].result;
-    }
-    function findFileByPath(expectedPath, throwFileNotFoundError) {
-        var normalizedName = ts.normalizePath(expectedPath).toLowerCase();
-        // Try to find the result through normal fileName
-        var result = replayFilesRead.get(normalizedName);
-        if (result) {
-            return result.result;
-        }
-        // If we got here, we didn't find a match
-        if (throwFileNotFoundError) {
-            throw new Error("No matching result in log array for path: " + expectedPath);
-        }
-        else {
-            return undefined;
-        }
-    }
-    function noOpReplay(_name) {
-        // console.log("Swallowed write operation during replay: " + name);
-    }
-    function wrapIO(underlying) {
-        var wrapper = {};
-        initWrapper(wrapper, underlying);
-        wrapper.directoryName = notSupported;
-        wrapper.createDirectory = notSupported;
-        wrapper.directoryExists = notSupported;
-        wrapper.deleteFile = notSupported;
-        wrapper.listFiles = notSupported;
-        return wrapper;
-        function notSupported() {
-            throw new Error("NotSupported");
-        }
-    }
-    Playback.wrapIO = wrapIO;
-    function wrapSystem(underlying) {
-        var wrapper = {};
-        initWrapper(wrapper, underlying);
-        return wrapper;
-    }
-    Playback.wrapSystem = wrapSystem;
-})(Playback || (Playback = {}));
-//# sourceMappingURL=harness.js.map
\ No newline at end of file
diff --git a/src/built/local/harness.js.map b/src/built/local/harness.js.map
deleted file mode 100644
index 8bae7bf1b91..00000000000
--- a/src/built/local/harness.js.map
+++ /dev/null
@@ -1 +0,0 @@
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\ No newline at end of file

From fc63eb9b7b08d6b770862abc6c447cc67495abdb Mon Sep 17 00:00:00 2001
From: Ryan Cavanaugh <the.ryan.cavanaugh@gmail.com>
Date: Sun, 10 Jun 2018 15:09:56 -0700
Subject: [PATCH 24/37] Fix runtests async

---
 Jakefile.js | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/Jakefile.js b/Jakefile.js
index a5cc7c26668..a78d6498e54 100644
--- a/Jakefile.js
+++ b/Jakefile.js
@@ -120,14 +120,18 @@ task(TaskNames.local, [
 
 desc("Runs all the tests in parallel using the built run.js file. Optional arguments are: t[ests]=category1|category2|... d[ebug]=true.");
 task(TaskNames.runtestsParallel, [TaskNames.lib], function () {
-    tsbuild([ConfigFileFor.runjs, ConfigFileFor.lint]);
-    runConsoleTests("min", /*parallel*/ true);
+    tsbuild([ConfigFileFor.runjs, ConfigFileFor.lint], undefined, () => {
+        runConsoleTests("min", /*parallel*/ true);
+        // runConsoleTests calls complete for us
+    });
 }, { async: true });
 
 desc("Runs all the tests in parallel using the built run.js file. Optional arguments are: t[ests]=category1|category2|... d[ebug]=true.");
 task(TaskNames.runtests, [TaskNames.lib], function () {
-    tsbuild([ConfigFileFor.runjs, ConfigFileFor.lint]);
-    runConsoleTests('mocha-fivemat-progress-reporter', /*runInParallel*/ false);;
+    tsbuild([ConfigFileFor.runjs, ConfigFileFor.lint], undefined, () => {
+        runConsoleTests('mocha-fivemat-progress-reporter', /*runInParallel*/ false);;
+        // runConsoleTests calls complete for us
+    });
 }, { async: true });
 
 // Makes the test results the new baseline

From 3b4b7dc12531d625e15aa7031ae98076b3ddcd58 Mon Sep 17 00:00:00 2001
From: Ryan Cavanaugh <the.ryan.cavanaugh@gmail.com>
Date: Sun, 10 Jun 2018 15:10:10 -0700
Subject: [PATCH 25/37] Fix unittests config

---
 src/testRunner/tsconfig.json | 1 +
 src/unittests/tsconfig.json  | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/testRunner/tsconfig.json b/src/testRunner/tsconfig.json
index fee848e39ff..cfde1107387 100644
--- a/src/testRunner/tsconfig.json
+++ b/src/testRunner/tsconfig.json
@@ -19,6 +19,7 @@
         { "path": "../services", "prepend": true },
         { "path": "../server", "prepend": true },
         { "path": "../harness", "prepend": true },
+        { "path": "../unittests", "prepend": true },
         { "path": "../typingsInstallerCore", "prepend": true }
     ],
 
diff --git a/src/unittests/tsconfig.json b/src/unittests/tsconfig.json
index 683812ba029..95c8f478994 100644
--- a/src/unittests/tsconfig.json
+++ b/src/unittests/tsconfig.json
@@ -19,5 +19,5 @@
         { "path": "../typingsInstallerCore" },
         { "path": "../harness" }
     ],
-    "include": ["**/*.ts"]
+    "include": ["*.ts", "**/*.ts"]
 }

From 19fe86a8c174a4accfb877db057e6f8b66f580c0 Mon Sep 17 00:00:00 2001
From: Ryan Cavanaugh <the.ryan.cavanaugh@gmail.com>
Date: Sun, 10 Jun 2018 15:20:58 -0700
Subject: [PATCH 26/37] Give up again

---
 Jakefile.js | 1353 ++++++++++++++++++++++++++++++++++-----------------
 1 file changed, 899 insertions(+), 454 deletions(-)

diff --git a/Jakefile.js b/Jakefile.js
index a78d6498e54..a6483355c73 100644
--- a/Jakefile.js
+++ b/Jakefile.js
@@ -2,277 +2,262 @@
 // @ts-check
 /// <reference types="jake" />
 
-const fs = require("fs");
-const os = require("os");
-const path = require("path");
-const child_process = require("child_process");
-const removeInternal = require("remove-internal");
-const fold = require("travis-fold");
-const ts = require("./lib/typescript");
-const del = require("del");
+var fs = require("fs");
+var os = require("os");
+var path = require("path");
+var child_process = require("child_process");
+var fold = require("travis-fold");
+var ts = require("./lib/typescript");
 const getDirSize = require("./scripts/build/getDirSize");
 
-const host = process.env.TYPESCRIPT_HOST || process.env.host || "node";
+// Variables
+var compilerDirectory = "src/compiler/";
+var serverDirectory = "src/server/";
+var harnessDirectory = "src/harness/";
+var libraryDirectory = "src/lib/";
+var scriptsDirectory = "scripts/";
+var unittestsDirectory = "src/harness/unittests/";
+var docDirectory = "doc/";
+var lclDirectory = "src/loc/lcl";
 
-const locales = ["cs", "de", "es", "fr", "it", "ja", "ko", "pl", "pt-br", "ru", "tr", "zh-cn", "zh-tw"];
+var builtDirectory = "built/";
+var builtLocalDirectory = "built/local/";
+var LKGDirectory = "lib/";
 
-const defaultTestTimeout = 40000;
+var copyright = "CopyrightNotice.txt";
+var thirdParty = "ThirdPartyNoticeText.txt";
 
-let useDebugMode = true;
+var defaultTestTimeout = 40000;
 
-const TaskNames = {
-    local: "local",
-    runtests: "runtests",
-    runtestsParallel: "runtests-parallel",
-    buildRules: "build-rules",
-    clean: "clean",
-    lib: "lib",
-    buildFoldStart: "build-fold-start",
-    buildFoldEnd: "build-fold-end",
-    generateDiagnostics: "generate-diagnostics",
-    coreBuild: "core-build",
-    lkg: "LKG",
-    release: "release",
-    lssl: "lssl",
-    lint: "lint"
-};
+// add node_modules to path so we don't need global modules, prefer the modules by adding them first
+var nodeModulesPathPrefix = path.resolve("./node_modules/.bin/") + path.delimiter;
+if (process.env.path !== undefined) {
+    process.env.path = nodeModulesPathPrefix + process.env.path;
+}
+else if (process.env.PATH !== undefined) {
+    process.env.PATH = nodeModulesPathPrefix + process.env.PATH;
+}
 
-const Paths = {
-    lkg: "lib",
-    lkgCompiler: "lib/tsc.js",
+/**
+ * @param diagnostics {ts.Diagnostic[]}
+ * @param [pretty] {boolean}
+ */
+function diagnosticsToString(diagnostics, pretty) {
+    const host = {
+        getCurrentDirectory() { return process.cwd(); },
+        getCanonicalFileName(fileName) { return fileName; },
+        getNewLine() { return os.EOL; }
+    };
+    return pretty ? ts.formatDiagnosticsWithColorAndContext(diagnostics, host) :
+        ts.formatDiagnostics(diagnostics, host);
+}
 
-    built: "built",
-    builtLocal: "built/local",
-    builtLocalCompiler: "built/local/tsc.js",
-    builtLocalRun: "built/local/run.js",
-    locLcg: "built/local/enu/diagnosticMessages.generated.json.lcg",
-    typesMapOutput: "built/local/typesMap.json",
-    
-    servicesFile: "built/local/typescriptServices.js",
-    servicesDefinitionFile: "built/local/typescriptServices.d.ts",
+/** @param diagnostics {ts.Diagnostic[]} */
+function reportDiagnostics(diagnostics) {
+    console.log(diagnosticsToString(diagnostics, process.stdout.isTTY));
+}
 
-    tsserverGlobalLibraryFile: "built/local/tsserverGlobalLibrary.js",
-    tsserverGlobalLibraryDefinitionFile: "built/local/tsserverGlobalLibrary.d.ts",
-    tsserverLibraryFile: "built/local/tsserverlibrary.js",
-    tsserverLibraryDefinitionFile: "built/local/tsserverlibrary.d.ts",
+/** @param jsonPath {string} */
+function readJson(jsonPath) {
+    const jsonText = fs.readFileSync(jsonPath, "utf8");
+    const result = ts.parseConfigFileTextToJson(jsonPath, jsonText);
+    if (result.error) {
+        reportDiagnostics([result.error]);
+        throw new Error("An error occurred during parse.");
+    }
+    return result.config;
+}
 
-    baselines: {
-        local: "tests/baselines/local",
-        localTest262: "tests/baselines/test262/local",
-        localRwc: "tests/baselines/rwc/local",
-        reference: "tests/baselines/reference",
-        referenceTest262: "tests/baselines/test262/reference",
-        referenceRwc: "tests/baselines/rwc/reference"
-    },
-    copyright: "CopyrightNotice.txt",
-    thirdParty: "ThirdPartyNoticeText.txt",
-    library: "src/lib",
+/** @param configPath {string} */
+function filesFromConfig(configPath) {
+    const config = readJson(configPath);
+    const configFileContent = ts.parseJsonConfigFileContent(config, ts.sys, path.dirname(configPath));
+    if (configFileContent.errors && configFileContent.errors.length) {
+        reportDiagnostics(configFileContent.errors);
+        throw new Error("An error occurred during parse.");
+    }
+    return configFileContent.fileNames;
+}
 
-    processDiagnosticMessagesJs: "scripts/processDiagnosticMessages.js",
-    diagnosticInformationMap: "src/parser/diagnosticInformationMap.generated.ts",
-    diagnosticMessagesJson: "src/parser/diagnosticMessages.json",
+function toNs(diff) {
+    return diff[0] * 1e9 + diff[1];
+}
 
-    srcServer: "src/server",
+function mark() {
+    if (!fold.isTravis()) return;
+    var stamp = process.hrtime();
+    var id = Math.floor(Math.random() * 0xFFFFFFFF).toString(16);
+    console.log("travis_time:start:" + id + "\r");
+    return {
+        stamp: stamp,
+        id: id
+    };
+}
 
-};
+function measure(marker) {
+    if (!fold.isTravis()) return;
+    var diff = process.hrtime(marker.stamp);
+    var total = [marker.stamp[0] + diff[0], marker.stamp[1] + diff[1]];
+    console.log("travis_time:end:" + marker.id + ":start=" + toNs(marker.stamp) + ",finish=" + toNs(total) + ",duration=" + toNs(diff) + "\r");
+}
 
-const ConfigFileFor = {
-    tsc: "src/tsc",
-    tsserver: "src/tsserver",
-    runjs: "src/testRunner",
-    lint: "scripts/tslint",
-    all: "src"
-};
+function removeConstModifierFromEnumDeclarations(text) {
+     return text.replace(/^(\s*)(export )?const enum (\S+) {(\s*)$/gm, '$1$2enum $3 {$4');
+}
 
-const ExpectedLKGFiles = [
-    "tsc.js",
-    "tsserver.js",
-    "typescriptServices.js",
-    "typescriptServices.d.ts",
-    "typescript.js",
-    "typescript.d.ts",
-    "tsserverlibrary.js",
-    "tsserverlibrary.d.js",
-    "cancellationToken.js",
-    "typingsInstaller.js",
-    "protocol.d.ts",
-    "watchGuard.js"
-];
+var compilerSources = filesFromConfig("./src/compiler/tsconfig.json");
+var servicesSources = filesFromConfig("./src/services/tsconfig.json");
+var cancellationTokenSources = filesFromConfig(path.join(serverDirectory, "cancellationToken/tsconfig.json"));
+var typingsInstallerSources = filesFromConfig(path.join(serverDirectory, "typingsInstaller/tsconfig.json"));
+var watchGuardSources = filesFromConfig(path.join(serverDirectory, "watchGuard/tsconfig.json"));
+var serverSources = filesFromConfig(path.join(serverDirectory, "tsconfig.json"));
+var languageServiceLibrarySources = filesFromConfig(path.join(serverDirectory, "tsconfig.library.json"));
+var harnessSources = filesFromConfig("./src/harness/tsconfig.json");
+
+var typesMapOutputPath = path.join(builtLocalDirectory, 'typesMap.json');
 
 /** @type {{ libs: string[], paths?: Record<string, string>, sources?: Record<string, string[]> }} */
-const libraries = readJson("./src/lib/libs.json");
+var libraries = readJson("./src/lib/libs.json");
 
-directory(Paths.builtLocal);
+/**
+ * .lcg file is what localization team uses to know what messages to localize.
+ * The file is always generated in 'enu\diagnosticMessages.generated.json.lcg'
+ */
+var generatedLCGFile = path.join(builtLocalDirectory, "enu", "diagnosticMessages.generated.json.lcg");
 
-// Local target to build the compiler and services
-desc("Builds the full compiler and services");
-task(TaskNames.local, [
-    TaskNames.buildFoldStart,
-    TaskNames.generateDiagnostics,
-    TaskNames.lib,
-    TaskNames.coreBuild,
-    // buildProtocolDts,
-    // builtGeneratedDiagnosticMessagesJSON,
-    TaskNames.lssl,
-    // "localize",
-    TaskNames.buildFoldEnd
-]);
+/**
+ * The localization target produces the two following transformations:
+ *    1. 'src\loc\lcl\<locale>\diagnosticMessages.generated.json.lcl' => 'built\local\<locale>\diagnosticMessages.generated.json'
+ *       convert localized resources into a .json file the compiler can understand
+ *    2. 'src\compiler\diagnosticMessages.generated.json' => 'built\local\ENU\diagnosticMessages.generated.json.lcg'
+ *       generate the lcg file (source of messages to localize) from the diagnosticMessages.generated.json
+ */
+var localizationTargets = ["cs", "de", "es", "fr", "it", "ja", "ko", "pl", "pt-br", "ru", "tr", "zh-cn", "zh-tw"].map(function (f) {
+    return path.join(builtLocalDirectory, f);
+}).concat(path.dirname(generatedLCGFile));
 
-desc("Runs all the tests in parallel using the built run.js file. Optional arguments are: t[ests]=category1|category2|... d[ebug]=true.");
-task(TaskNames.runtestsParallel, [TaskNames.lib], function () {
-    tsbuild([ConfigFileFor.runjs, ConfigFileFor.lint], undefined, () => {
-        runConsoleTests("min", /*parallel*/ true);
-        // runConsoleTests calls complete for us
-    });
-}, { async: true });
-
-desc("Runs all the tests in parallel using the built run.js file. Optional arguments are: t[ests]=category1|category2|... d[ebug]=true.");
-task(TaskNames.runtests, [TaskNames.lib], function () {
-    tsbuild([ConfigFileFor.runjs, ConfigFileFor.lint], undefined, () => {
-        runConsoleTests('mocha-fivemat-progress-reporter', /*runInParallel*/ false);;
-        // runConsoleTests calls complete for us
-    });
-}, { async: true });
-
-// Makes the test results the new baseline
-desc("Makes the most recent test results the new baseline, overwriting the old baseline");
-task("baseline-accept", function () {
-    acceptBaseline(Paths.baselines.local, Paths.baselines.reference);
-});
-
-desc("Makes the most recent rwc test results the new baseline, overwriting the old baseline");
-task("baseline-accept-rwc", function () {
-    acceptBaseline(Paths.baselines.localRwc, Paths.baselines.referenceRwc);
-});
-
-desc("Makes the most recent test262 test results the new baseline, overwriting the old baseline");
-task("baseline-accept-test262", function () {
-    acceptBaseline(Paths.baselines.localTest262, Paths.baselines.referenceTest262);
-});
-
-const libraryTargets = getLibraryTargets();
-desc("Builds the library targets");
-task(TaskNames.lib, libraryTargets);
-
-desc("Builds language service server library");
-task("lssl", [TaskNames.coreBuild, Paths.tsserverLibraryFile, Paths.tsserverLibraryDefinitionFile, Paths.typesMapOutput]);
-
-// Makes a new LKG. This target does not build anything, but errors if not all the outputs are present in the built/local directory
-desc("Makes a new LKG out of the built js files");
-task(TaskNames.lkg, [
-    TaskNames.clean,
-    TaskNames.release,
-    TaskNames.local,
-    ...libraryTargets
-], () => {
-    const sizeBefore = getDirSize(Paths.lkg);
-    const localizationTargets = locales.map(f => path.join(Paths.builtLocal, f)).concat(path.dirname(Paths.locLcg));
-
-    const copyrightContent = readFileSync(Paths.copyright);
-
-    const expectedFiles = [...libraryTargets, ...ExpectedLKGFiles, ...localizationTargets];
-    const missingFiles = expectedFiles.filter(f => !fs.existsSync(f));
-    if (missingFiles.length > 0) {
-        fail(new Error("Cannot replace the LKG unless all built targets are present in directory " + Paths.builtLocal +
-            ". The following files are missing:\n" + missingFiles.join("\n")));
+// Prepends the contents of prefixFile to destinationFile
+function prependFile(prefixFile, destinationFile) {
+    if (!fs.existsSync(prefixFile)) {
+        fail(prefixFile + " does not exist!");
     }
-    // Copy all the targets into the LKG directory
-    jake.mkdirP(Paths.lkg);
-    expectedFiles.forEach(f => {
-        let content = readFileSync(f);
+    if (!fs.existsSync(destinationFile)) {
+        fail(destinationFile + " failed to be created!");
+    }
+    var temp = "temptemp";
+    jake.cpR(prefixFile, temp, { silent: true });
+    fs.appendFileSync(temp, fs.readFileSync(destinationFile));
+    fs.renameSync(temp, destinationFile);
+}
 
-        // If this is a .d.ts file, run remove-internal on it
-        if (f.endsWith(".d.ts")) {
-            content = removeInternal.elide(content).result;
+// concatenate a list of sourceFiles to a destinationFile
+function concatenateFiles(destinationFile, sourceFiles) {
+    var temp = "temptemp";
+    // append all files in sequence
+    var text = "";
+    for (var i = 0; i < sourceFiles.length; i++) {
+        if (!fs.existsSync(sourceFiles[i])) {
+            fail(sourceFiles[i] + " does not exist!");
+        }
+        if (i > 0) { text += "\n\n"; }
+        text += fs.readFileSync(sourceFiles[i]).toString().replace(/\r?\n/g, "\n");
+    }
+    fs.writeFileSync(temp, text);
+    // Move the file to the final destination
+    fs.renameSync(temp, destinationFile);
+}
+
+var useDebugMode = true;
+var host = process.env.TYPESCRIPT_HOST || process.env.host || "node";
+var compilerFilename = "tsc.js";
+var LKGCompiler = path.join(LKGDirectory, compilerFilename);
+var builtLocalCompiler = path.join(builtLocalDirectory, compilerFilename);
+
+/**
+ * Compiles a file from a list of sources
+ * @param {string} outFile the target file name
+ * @param {string[]} sources an array of the names of the source files
+ * @param {string[]} prereqs prerequisite tasks to compiling the file
+ * @param {string[]} prefixes a list of files to prepend to the target file
+ * @param {boolean} useBuiltCompiler true to use the built compiler, false to use the LKG
+ * @param {object} [opts] property bag containing auxiliary options
+ * @param {boolean} [opts.noOutFile] true to compile without using --out
+ * @param {boolean} [opts.generateDeclarations] true to compile using --declaration
+ * @param {string} [opts.outDir] value for '--outDir' command line option
+ * @param {boolean} [opts.keepComments] false to compile using --removeComments
+ * @param {boolean} [opts.preserveConstEnums] true if compiler should keep const enums in code
+ * @param {boolean} [opts.noResolve] true if compiler should not include non-rooted files in compilation
+ * @param {boolean} [opts.stripInternal] true if compiler should remove declarations marked as internal
+ * @param {boolean} [opts.inlineSourceMap] true if compiler should inline sourceMap
+ * @param {string[]} [opts.types] array of types to include in compilation
+ * @param {string} [opts.lib] explicit libs to include.
+ * @param {function(): void} [callback] a function to execute after the compilation process ends
+ */
+function compileFile(outFile, sources, prereqs, prefixes, useBuiltCompiler, opts, callback) {
+    file(outFile, prereqs, function() {
+        var startCompileTime = mark();
+        opts = opts || {};
+        var compilerPath = useBuiltCompiler ? builtLocalCompiler : LKGCompiler;
+        var options = "--noImplicitAny --noImplicitThis --alwaysStrict --noEmitOnError";
+        if (opts.types) {
+            options += " --types " + opts.types.join(",");
+        }
+        options += " --pretty";
+        // Keep comments when specifically requested
+        // or when in debug mode.
+        if (!(opts.keepComments || useDebugMode)) {
+            options += " --removeComments";
         }
 
-        if (f.endsWith(".d.ts") || f.endsWith(".js")) {
-            // Prepend the copyright header to it
-            content = copyrightContent + content;
+        if (opts.generateDeclarations) {
+            options += " --declaration";
         }
 
-        fs.writeFile(path.join(Paths.lkg, path.basename(f)), content, { encoding: 'utf-8' }, (err) => {
-            if (err) throw err;
-        });
-    });
+        if (opts.preserveConstEnums || useDebugMode) {
+            options += " --preserveConstEnums";
+        }
 
-    const sizeAfter = getDirSize(Paths.lkg);
-    if (sizeAfter > (sizeBefore * 1.10)) {
-        throw new Error("The lib folder increased by 10% or more. This likely indicates a bug.");
-    }
-});
+        if (opts.outDir) {
+            options += " --outDir " + opts.outDir;
+        }
 
-desc("Runs tslint on the compiler sources. Optional arguments are: f[iles]=regex");
-task(TaskNames.lint, [TaskNames.buildRules], () => {
-    if (fold.isTravis()) console.log(fold.start("lint"));
-    function lint(project, cb) {
-        const fix = process.env.fix || process.env.f;
-        const cmd = `node node_modules/tslint/bin/tslint --project ${project} --formatters-dir ./built/local/tslint/formatters --format autolinkableStylish${fix ? " --fix" : ""}`;
-        console.log("Linting: " + cmd);
-        jake.exec([cmd], cb, /** @type {jake.ExecOptions} */({ interactive: true, windowsVerbatimArguments: true }));
-    }
-    lint("scripts/tslint/tsconfig.json", () => lint("src/tsconfig-base.json", () => {
-        if (fold.isTravis()) console.log(fold.end("lint"));
-        complete();
-    }));
-});
+        if (!opts.noOutFile) {
+            options += " --out " + outFile;
+        }
+        else {
+            options += " --module commonjs";
+        }
 
-desc("Diffs the compiler baselines using the diff tool specified by the 'DIFF' environment variable");
-task('diff', function () {
-    var cmd = `"${getDiffTool()} ${Paths.baselines.reference} ${Paths.baselines.local}`;
-    console.log(cmd);
-    exec(cmd);
-}, { async: true });
+        if (opts.noResolve) {
+            options += " --noResolve";
+        }
 
-desc("Diffs the RWC baselines using the diff tool specified by the 'DIFF' environment variable");
-task('diff-rwc', function () {
-    var cmd = `"${getDiffTool()} ${Paths.baselines.referenceRwc} ${Paths.baselines.localRwc}`;
-    console.log(cmd);
-    exec(cmd);
-}, { async: true });
+        if (useDebugMode) {
+            if (opts.inlineSourceMap) {
+                options += " --inlineSourceMap --inlineSources";
+            }
+            else {
+                options += " --sourcemap";
+            }
+        }
+        options += " --newLine LF";
 
-desc("Sets the release mode flag");
-task("release", function () {
-    useDebugMode = false;
-});
+        if (opts.stripInternal) {
+            options += " --stripInternal";
+        }
+        options +=  " --target es5";
+        if (opts.lib) {
+            options += " --lib " + opts.lib;
+        }
+        else {
+            options += " --lib es5";
+        }
+        options += " --noUnusedLocals --noUnusedParameters --strictNullChecks";
 
-desc("Clears the release mode flag");
-task("setDebugMode", function () {
-    useDebugMode = true;
-});
+        var cmd = host + " " + compilerPath + " " + options + " ";
+        cmd = cmd + sources.join(" ");
+        console.log(cmd + "\n");
 
-desc("Emit the start of the build fold");
-task(TaskNames.buildFoldStart, [], function () {
-    if (fold.isTravis()) console.log(fold.start("build"));
-});
-
-desc("Emit the end of the build fold");
-task(TaskNames.buildFoldEnd, [], function () {
-    if (fold.isTravis()) console.log(fold.end("build"));
-});
-
-desc("Compiles tslint rules to js");
-task(TaskNames.buildRules, [], function () {
-    tsbuild(ConfigFileFor.lint, undefined, () => complete());
-}, { async: true });
-
-desc("Cleans the compiler output, declare files, and tests");
-task(TaskNames.clean, function () {
-    jake.rmRf(Paths.built);
-});
-
-desc("Generates a diagnostic file in TypeScript based on an input JSON file");
-task(TaskNames.generateDiagnostics, [Paths.diagnosticInformationMap]);
-
-task(TaskNames.coreBuild, function () {
-    tsbuild(ConfigFileFor.all, undefined, () => complete());
-}, { async: true });
-
-file(Paths.diagnosticMessagesJson);
-file(Paths.diagnosticInformationMap, [Paths.diagnosticMessagesJson], function (complete) {
-    tsbuild("scripts/processDiagnosticMessages.tsconfig.json", /*lkg*/ true, function () {
-        const cmd = `${host} scripts/processDiagnosticMessages.js ${Paths.diagnosticMessagesJson}`;
-        console.log(cmd);
         var ex = jake.createExec([cmd]);
         // Add listeners for output and error
         ex.addListener("stdout", function (output) {
@@ -282,52 +267,492 @@ file(Paths.diagnosticInformationMap, [Paths.diagnosticMessagesJson], function (c
             process.stderr.write(error);
         });
         ex.addListener("cmdEnd", function () {
+            if (!useDebugMode && prefixes && fs.existsSync(outFile)) {
+                for (var i in prefixes) {
+                    prependFile(prefixes[i], outFile);
+                }
+            }
+
+            if (callback) {
+                callback();
+            }
+
+            measure(startCompileTime);
             complete();
         });
+        ex.addListener("error", function () {
+            fs.unlinkSync(outFile);
+            fail("Compilation of " + outFile + " unsuccessful");
+            measure(startCompileTime);
+        });
         ex.run();
+    }, { async: true });
+}
+
+// Prerequisite task for built directory and library typings
+directory(builtLocalDirectory);
+
+var libraryTargets = libraries.libs.map(function (lib) {
+    var relativeSources = ["header.d.ts"].concat(libraries.sources && libraries.sources[lib] || [lib + ".d.ts"]);
+    var relativeTarget = libraries.paths && libraries.paths[lib] || ("lib." + lib + ".d.ts");
+    var sources = [copyright].concat(relativeSources.map(s => path.join(libraryDirectory, s)));
+    var target = path.join(builtLocalDirectory, relativeTarget);
+    file(target, [builtLocalDirectory].concat(sources), function () {
+        concatenateFiles(target, sources);
     });
+    return target;
+});
+
+// Lib target to build the library files
+desc("Builds the library targets");
+task("lib", libraryTargets);
+
+
+// Generate diagnostics
+var processDiagnosticMessagesJs = path.join(scriptsDirectory, "processDiagnosticMessages.js");
+var processDiagnosticMessagesTs = path.join(scriptsDirectory, "processDiagnosticMessages.ts");
+var processDiagnosticMessagesSources = filesFromConfig("./scripts/processDiagnosticMessages.tsconfig.json");
+
+var diagnosticMessagesJson = path.join(compilerDirectory, "diagnosticMessages.json");
+var diagnosticInfoMapTs = path.join(compilerDirectory, "diagnosticInformationMap.generated.ts");
+var generatedDiagnosticMessagesJSON = path.join(compilerDirectory, "diagnosticMessages.generated.json");
+var builtGeneratedDiagnosticMessagesJSON = path.join(builtLocalDirectory, "diagnosticMessages.generated.json");
+
+file(processDiagnosticMessagesTs);
+
+// processDiagnosticMessages script
+compileFile(processDiagnosticMessagesJs,
+    processDiagnosticMessagesSources,
+    processDiagnosticMessagesSources,
+    [],
+    /*useBuiltCompiler*/ false);
+
+// Localize diagnostics script
+var generateLocalizedDiagnosticMessagesJs = path.join(scriptsDirectory, "generateLocalizedDiagnosticMessages.js");
+var generateLocalizedDiagnosticMessagesTs = path.join(scriptsDirectory, "generateLocalizedDiagnosticMessages.ts");
+
+file(generateLocalizedDiagnosticMessagesTs);
+
+compileFile(generateLocalizedDiagnosticMessagesJs,
+    [generateLocalizedDiagnosticMessagesTs],
+    [generateLocalizedDiagnosticMessagesTs],
+    [],
+    /*useBuiltCompiler*/ false, { noOutFile: true, types: ["node", "xml2js"] });
+
+// Localize diagnostics
+file(generatedLCGFile, [generateLocalizedDiagnosticMessagesJs, diagnosticInfoMapTs, generatedDiagnosticMessagesJSON], function () {
+    var cmd = host + " " + generateLocalizedDiagnosticMessagesJs + " " + lclDirectory + " " + builtLocalDirectory + " " + generatedDiagnosticMessagesJSON;
+    console.log(cmd);
+    var ex = jake.createExec([cmd]);
+    // Add listeners for output and error
+    ex.addListener("stdout", function (output) {
+        process.stdout.write(output);
+    });
+    ex.addListener("stderr", function (error) {
+        process.stderr.write(error);
+    });
+    ex.addListener("cmdEnd", function () {
+        complete();
+    });
+    ex.run();
 }, { async: true });
 
-file(Paths.typesMapOutput, /** @type {*} */(function () {
-    var content = readFileSync(path.join(Paths.srcServer, 'typesMap.json'));
+task("localize", [generatedLCGFile]);
+
+var buildProtocolTs = path.join(scriptsDirectory, "buildProtocol.ts");
+var buildProtocolJs = path.join(scriptsDirectory, "buildProtocol.js");
+var buildProtocolDts = path.join(builtLocalDirectory, "protocol.d.ts");
+var typescriptServicesDts = path.join(builtLocalDirectory, "typescriptServices.d.ts");
+
+file(buildProtocolTs);
+
+compileFile(buildProtocolJs,
+    [buildProtocolTs],
+    [buildProtocolTs],
+    [],
+    /*useBuiltCompiler*/ false,
+    { noOutFile: true, lib: "es6" });
+
+file(buildProtocolDts, [buildProtocolTs, buildProtocolJs, typescriptServicesDts], function() {
+
+    var protocolTs = path.join(serverDirectory, "protocol.ts");
+
+    var cmd = host + " " + buildProtocolJs + " "+ protocolTs + " " + typescriptServicesDts + " " + buildProtocolDts;
+    console.log(cmd);
+    var ex = jake.createExec([cmd]);
+    // Add listeners for output and error
+    ex.addListener("stdout", function (output) {
+        process.stdout.write(output);
+    });
+    ex.addListener("stderr", function (error) {
+        process.stderr.write(error);
+    });
+    ex.addListener("cmdEnd", function () {
+        complete();
+    });
+    ex.run();
+}, { async: true });
+
+// The generated diagnostics map; built for the compiler and for the 'generate-diagnostics' task
+file(diagnosticInfoMapTs, [processDiagnosticMessagesJs, diagnosticMessagesJson], function () {
+    var cmd = host + " " + processDiagnosticMessagesJs + " " + diagnosticMessagesJson;
+    console.log(cmd);
+    var ex = jake.createExec([cmd]);
+    // Add listeners for output and error
+    ex.addListener("stdout", function (output) {
+        process.stdout.write(output);
+    });
+    ex.addListener("stderr", function (error) {
+        process.stderr.write(error);
+    });
+    ex.addListener("cmdEnd", function () {
+        complete();
+    });
+    ex.run();
+}, { async: true });
+
+file(builtGeneratedDiagnosticMessagesJSON, [generatedDiagnosticMessagesJSON], function () {
+    if (fs.existsSync(builtLocalDirectory)) {
+        jake.cpR(generatedDiagnosticMessagesJSON, builtGeneratedDiagnosticMessagesJSON);
+    }
+});
+
+desc("Generates a diagnostic file in TypeScript based on an input JSON file");
+task("generate-diagnostics", [diagnosticInfoMapTs]);
+
+// Publish nightly
+var configurePrereleaseJs = path.join(scriptsDirectory, "configurePrerelease.js");
+var configurePrereleaseTs = path.join(scriptsDirectory, "configurePrerelease.ts");
+var packageJson = "package.json";
+var versionFile = path.join(compilerDirectory, "core.ts");
+
+file(configurePrereleaseTs);
+
+compileFile(/*outfile*/configurePrereleaseJs,
+            /*sources*/[configurePrereleaseTs],
+            /*prereqs*/[configurePrereleaseTs],
+            /*prefixes*/[],
+            /*useBuiltCompiler*/ false,
+    { noOutFile: true, generateDeclarations: false, keepComments: false, noResolve: false, stripInternal: false });
+
+task("setDebugMode", function () {
+    useDebugMode = true;
+});
+
+task("configure-nightly", [configurePrereleaseJs], function () {
+    var cmd = host + " " + configurePrereleaseJs + " dev " + packageJson + " " + versionFile;
+    console.log(cmd);
+    exec(cmd);
+}, { async: true });
+
+desc("Configure, build, test, and publish the nightly release.");
+task("publish-nightly", ["configure-nightly", "LKG", "clean", "setDebugMode", "runtests-parallel"], function () {
+    var cmd = "npm publish --tag next";
+    console.log(cmd);
+    exec(cmd);
+});
+
+task("configure-insiders", [configurePrereleaseJs], function () {
+    var cmd = host + " " + configurePrereleaseJs + " insiders " + packageJson + " " + versionFile;
+    console.log(cmd);
+    exec(cmd);
+}, { async: true });
+
+desc("Configure, build, test, and publish the insiders release.");
+task("publish-insiders", ["configure-insiders", "LKG", "clean", "setDebugMode", "runtests-parallel"], function () {
+    var cmd = "npm publish --tag insiders";
+    console.log(cmd);
+    exec(cmd);
+});
+
+var importDefinitelyTypedTestsDirectory = path.join(scriptsDirectory, "importDefinitelyTypedTests");
+var importDefinitelyTypedTestsJs = path.join(importDefinitelyTypedTestsDirectory, "importDefinitelyTypedTests.js");
+var importDefinitelyTypedTestsTs = path.join(importDefinitelyTypedTestsDirectory, "importDefinitelyTypedTests.ts");
+
+file(importDefinitelyTypedTestsTs);
+file(importDefinitelyTypedTestsJs, ["tsd-scripts", importDefinitelyTypedTestsTs], function () {
+    var cmd = host + " " + LKGCompiler + " -p " + importDefinitelyTypedTestsDirectory;
+    console.log(cmd);
+    exec(cmd);
+}, { async: true });
+
+task("importDefinitelyTypedTests", [importDefinitelyTypedTestsJs], function () {
+    var cmd = host + " " + importDefinitelyTypedTestsJs + " ./ ../DefinitelyTyped";
+    console.log(cmd);
+    exec(cmd);
+}, { async: true });
+
+// Local target to build the compiler and services
+var tscFile = path.join(builtLocalDirectory, compilerFilename);
+compileFile(tscFile, compilerSources, [builtLocalDirectory, copyright].concat(compilerSources), [copyright], /*useBuiltCompiler:*/ false);
+
+var servicesFile = path.join(builtLocalDirectory, "typescriptServices.js");
+var standaloneDefinitionsFile = path.join(builtLocalDirectory, "typescriptServices.d.ts");
+var nodePackageFile = path.join(builtLocalDirectory, "typescript.js");
+var nodeDefinitionsFile = path.join(builtLocalDirectory, "typescript.d.ts");
+var nodeStandaloneDefinitionsFile = path.join(builtLocalDirectory, "typescript_standalone.d.ts");
+
+compileFile(servicesFile, servicesSources, [builtLocalDirectory, copyright].concat(servicesSources),
+            /*prefixes*/[copyright],
+            /*useBuiltCompiler*/ true,
+            /*opts*/ {
+        noOutFile: false,
+        generateDeclarations: true,
+        preserveConstEnums: true,
+        keepComments: true,
+        noResolve: false,
+        stripInternal: true
+    },
+            /*callback*/ function () {
+        jake.cpR(servicesFile, nodePackageFile, { silent: true });
+
+        prependFile(copyright, standaloneDefinitionsFile);
+
+        // Stanalone/web definition file using global 'ts' namespace
+        jake.cpR(standaloneDefinitionsFile, nodeDefinitionsFile, { silent: true });
+        var definitionFileContents = fs.readFileSync(nodeDefinitionsFile).toString();
+        definitionFileContents = removeConstModifierFromEnumDeclarations(definitionFileContents);
+        fs.writeFileSync(standaloneDefinitionsFile, definitionFileContents);
+
+        // Official node package definition file, pointed to by 'typings' in package.json
+        // Created by appending 'export = ts;' at the end of the standalone file to turn it into an external module
+        var nodeDefinitionsFileContents = definitionFileContents + "\nexport = ts;";
+        fs.writeFileSync(nodeDefinitionsFile, nodeDefinitionsFileContents);
+
+        // Node package definition file to be distributed without the package. Created by replacing
+        // 'ts' namespace with '"typescript"' as a module.
+        var nodeStandaloneDefinitionsFileContents = definitionFileContents.replace(/declare (namespace|module) ts/g, 'declare module "typescript"');
+        fs.writeFileSync(nodeStandaloneDefinitionsFile, nodeStandaloneDefinitionsFileContents);
+    });
+
+file(typescriptServicesDts, [servicesFile]);
+
+var cancellationTokenFile = path.join(builtLocalDirectory, "cancellationToken.js");
+compileFile(cancellationTokenFile, cancellationTokenSources, [builtLocalDirectory].concat(cancellationTokenSources), /*prefixes*/ [copyright], /*useBuiltCompiler*/ true, { types: ["node"], outDir: builtLocalDirectory, noOutFile: true, lib: "es6" });
+
+var typingsInstallerFile = path.join(builtLocalDirectory, "typingsInstaller.js");
+compileFile(typingsInstallerFile, typingsInstallerSources, [builtLocalDirectory].concat(typingsInstallerSources), /*prefixes*/ [copyright], /*useBuiltCompiler*/ true, { types: ["node"], outDir: builtLocalDirectory, noOutFile: false, lib: "es6" });
+
+var watchGuardFile = path.join(builtLocalDirectory, "watchGuard.js");
+compileFile(watchGuardFile, watchGuardSources, [builtLocalDirectory].concat(watchGuardSources), /*prefixes*/ [copyright], /*useBuiltCompiler*/ true, { types: ["node"], outDir: builtLocalDirectory, noOutFile: false, lib: "es6" });
+
+var serverFile = path.join(builtLocalDirectory, "tsserver.js");
+compileFile(serverFile, serverSources, [builtLocalDirectory, copyright, cancellationTokenFile, typingsInstallerFile, watchGuardFile].concat(serverSources).concat(servicesSources), /*prefixes*/ [copyright], /*useBuiltCompiler*/ true, { types: ["node"], preserveConstEnums: true, lib: "es6" });
+var tsserverLibraryFile = path.join(builtLocalDirectory, "tsserverlibrary.js");
+var tsserverLibraryDefinitionFile = path.join(builtLocalDirectory, "tsserverlibrary.d.ts");
+file(typesMapOutputPath, /** @type {*} */(function() {
+    var content = fs.readFileSync(path.join(serverDirectory, 'typesMap.json'));
     // Validate that it's valid JSON
     try {
         JSON.parse(content.toString());
     } catch (e) {
         console.log("Parse error in typesMap.json: " + e);
     }
-    fs.writeFileSync(Paths.typesMapOutput, content);
+    fs.writeFileSync(typesMapOutputPath, content);
 }));
+compileFile(
+    tsserverLibraryFile,
+    languageServiceLibrarySources,
+    [builtLocalDirectory, copyright, builtLocalCompiler].concat(languageServiceLibrarySources).concat(libraryTargets),
+    /*prefixes*/[copyright],
+    /*useBuiltCompiler*/ true,
+    { noOutFile: false, generateDeclarations: true, stripInternal: true, preserveConstEnums: true, keepComments: true },
+    /*callback*/ function () {
+        prependFile(copyright, tsserverLibraryDefinitionFile);
 
-file(Paths.tsserverLibraryFile, [TaskNames.coreBuild, Paths.copyright, ...libraryTargets], function() {
-    const originalContent = readFileSync(Paths.tsserverGlobalLibraryFile);
-    const newContent =
-        readFileSync(Paths.copyright) +
-        originalContent;
-    writeFileSync(Paths.tsserverLibraryFile, newContent);
-});
+        // Appending exports at the end of the server library
+        var tsserverLibraryDefinitionFileContents =
+            fs.readFileSync(tsserverLibraryDefinitionFile).toString() +
+            "\nexport = ts;" +
+            "\nexport as namespace ts;";
+        tsserverLibraryDefinitionFileContents = removeConstModifierFromEnumDeclarations(tsserverLibraryDefinitionFileContents);
 
-file(Paths.tsserverLibraryDefinitionFile, [TaskNames.coreBuild, Paths.copyright, ...libraryTargets], function () {
-    const content = readFileSync(Paths.tsserverGlobalLibraryDefinitionFile);
-    const newContent =
-        removeConstModifierFromEnumDeclarations(content) +
-        `\nexport = ts` +
-        `\nexport as namespace ts;`;
-
-    writeFileSync(Paths.tsserverLibraryDefinitionFile, newContent);
-});
-
-function getLibraryTargets() {
-    return libraries.libs.map(function (lib) {
-        var relativeSources = ["header.d.ts"].concat(libraries.sources && libraries.sources[lib] || [lib + ".d.ts"]);
-        var relativeTarget = libraries.paths && libraries.paths[lib] || ("lib." + lib + ".d.ts");
-        var sources = [Paths.copyright].concat(relativeSources.map(s => path.join(Paths.library, s)));
-        var target = path.join(Paths.builtLocal, relativeTarget);
-        file(target, [Paths.builtLocal].concat(sources), function () {
-            concatenateFiles(target, sources);
-        });
-        return target;
+        fs.writeFileSync(tsserverLibraryDefinitionFile, tsserverLibraryDefinitionFileContents);
     });
+
+// Local target to build the language service server library
+desc("Builds language service server library");
+task("lssl", [tsserverLibraryFile, tsserverLibraryDefinitionFile, typesMapOutputPath]);
+
+desc("Emit the start of the build fold");
+task("build-fold-start", [], function () {
+    if (fold.isTravis()) console.log(fold.start("build"));
+});
+
+desc("Emit the end of the build fold");
+task("build-fold-end", [], function () {
+    if (fold.isTravis()) console.log(fold.end("build"));
+});
+
+// Local target to build the compiler and services
+desc("Builds the full compiler and services");
+task("local", ["build-fold-start", "generate-diagnostics", "lib", tscFile, servicesFile, nodeDefinitionsFile, serverFile, buildProtocolDts, builtGeneratedDiagnosticMessagesJSON, "lssl", "localize", "build-fold-end"]);
+
+// Local target to build only tsc.js
+desc("Builds only the compiler");
+task("tsc", ["generate-diagnostics", "lib", tscFile]);
+
+// Local target to build the compiler and services
+desc("Sets release mode flag");
+task("release", function () {
+    useDebugMode = false;
+});
+
+// Set the default task to "local"
+task("default", ["local"]);
+
+// Cleans the built directory
+desc("Cleans the compiler output, declare files, and tests");
+task("clean", function () {
+    jake.rmRf(builtDirectory);
+});
+
+// Generate Markdown spec
+var word2mdJs = path.join(scriptsDirectory, "word2md.js");
+var word2mdTs = path.join(scriptsDirectory, "word2md.ts");
+var specWord = path.join(docDirectory, "TypeScript Language Specification.docx");
+var specMd = path.join(docDirectory, "spec.md");
+
+file(word2mdTs);
+
+// word2md script
+compileFile(word2mdJs,
+    [word2mdTs],
+    [word2mdTs],
+    [],
+    /*useBuiltCompiler*/ false,
+    {
+        lib: "scripthost,es5"
+    });
+
+// The generated spec.md; built for the 'generate-spec' task
+file(specMd, [word2mdJs, specWord], function () {
+    var specWordFullPath = path.resolve(specWord);
+    var specMDFullPath = path.resolve(specMd);
+    var cmd = "cscript //nologo " + word2mdJs + ' "' + specWordFullPath + '" ' + '"' + specMDFullPath + '"';
+    console.log(cmd);
+    child_process.exec(cmd, function () {
+        complete();
+    });
+}, { async: true });
+
+
+desc("Generates a Markdown version of the Language Specification");
+task("generate-spec", [specMd]);
+
+
+// Makes a new LKG. This target does not build anything, but errors if not all the outputs are present in the built/local directory
+desc("Makes a new LKG out of the built js files");
+task("LKG", ["clean", "release", "local"].concat(libraryTargets), () => {
+    const sizeBefore = getDirSize(LKGDirectory);
+    var expectedFiles = [tscFile, servicesFile, serverFile, nodePackageFile, nodeDefinitionsFile, standaloneDefinitionsFile, tsserverLibraryFile, tsserverLibraryDefinitionFile, cancellationTokenFile, typingsInstallerFile, buildProtocolDts, watchGuardFile].
+        concat(libraryTargets).
+        concat(localizationTargets);
+    var missingFiles = expectedFiles.filter(f => !fs.existsSync(f));
+    if (missingFiles.length > 0) {
+        fail(new Error("Cannot replace the LKG unless all built targets are present in directory " + builtLocalDirectory +
+            ". The following files are missing:\n" + missingFiles.join("\n")));
+    }
+    // Copy all the targets into the LKG directory
+    jake.mkdirP(LKGDirectory);
+    expectedFiles.forEach(f => jake.cpR(f, LKGDirectory));
+
+    const sizeAfter = getDirSize(LKGDirectory);
+    if (sizeAfter > (sizeBefore * 1.10)) {
+        throw new Error("The lib folder increased by 10% or more. This likely indicates a bug.");
+    }
+});
+
+// Test directory
+directory(builtLocalDirectory);
+
+// Task to build the tests infrastructure using the built compiler
+var run = path.join(builtLocalDirectory, "run.js");
+compileFile(
+    /*outFile*/ run,
+    /*source*/ harnessSources,
+    /*prereqs*/[builtLocalDirectory, tscFile, tsserverLibraryFile].concat(libraryTargets).concat(servicesSources).concat(harnessSources),
+    /*prefixes*/[],
+    /*useBuiltCompiler:*/ true,
+    /*opts*/ { types: ["node", "mocha", "chai"], lib: "es6" });
+
+var internalTests = "internal/";
+
+var localBaseline = "tests/baselines/local/";
+var refBaseline = "tests/baselines/reference/";
+
+var localRwcBaseline = path.join(internalTests, "baselines/rwc/local");
+var refRwcBaseline = path.join(internalTests, "baselines/rwc/reference");
+
+var localTest262Baseline = path.join(internalTests, "baselines/test262/local");
+var refTest262Baseline = path.join(internalTests, "baselines/test262/reference");
+
+desc("Builds the test infrastructure using the built compiler");
+task("tests", ["local", run].concat(libraryTargets));
+
+function exec(cmd, completeHandler, errorHandler) {
+    var ex = jake.createExec([cmd], /** @type {jake.ExecOptions} */({ windowsVerbatimArguments: true, interactive: true }));
+    // Add listeners for output and error
+    ex.addListener("stdout", function (output) {
+        process.stdout.write(output);
+    });
+    ex.addListener("stderr", function (error) {
+        process.stderr.write(error);
+    });
+    ex.addListener("cmdEnd", function () {
+        if (completeHandler) {
+            completeHandler();
+        }
+        complete();
+    });
+    ex.addListener("error", function (e, status) {
+        if (errorHandler) {
+            errorHandler(e, status);
+        }
+        else {
+            fail("Process exited with code " + status);
+        }
+    });
+
+    ex.run();
+}
+
+const del = require("del");
+function cleanTestDirs() {
+    // Clean the local baselines directory
+    if (fs.existsSync(localBaseline)) {
+        del.sync(localBaseline);
+    }
+
+    // Clean the local Rwc baselines directory
+    if (fs.existsSync(localRwcBaseline)) {
+        del.sync(localRwcBaseline);
+    }
+
+    jake.mkdirP(localRwcBaseline);
+    jake.mkdirP(localTest262Baseline);
+    jake.mkdirP(localBaseline);
+}
+
+// used to pass data from jake command line directly to run.js
+function writeTestConfigFile(tests, runners, light, taskConfigsFolder, workerCount, stackTraceLimit, colors, testTimeout) {
+    var testConfigContents = JSON.stringify({
+        runners: runners ? runners.split(",") : undefined,
+        test: tests ? [tests] : undefined,
+        light: light,
+        workerCount: workerCount,
+        taskConfigsFolder: taskConfigsFolder,
+        stackTraceLimit: stackTraceLimit,
+        noColor: !colors,
+        timeout: testTimeout
+    });
+    fs.writeFileSync('test.config', testConfigContents);
+}
+
+function deleteTemporaryProjectOutput() {
+    if (fs.existsSync(path.join(localBaseline, "projectOutput/"))) {
+        jake.rmRf(path.join(localBaseline, "projectOutput/"));
+    }
 }
 
 function runConsoleTests(defaultReporter, runInParallel) {
@@ -378,7 +803,7 @@ function runConsoleTests(defaultReporter, runInParallel) {
     // timeout normally isn't necessary but Travis-CI has been timing out on compiler baselines occasionally
     // default timeout is 2sec which really should be enough, but maybe we just need a small amount longer
     if (!runInParallel) {
-        var startTime = Travis.mark();
+        var startTime = mark();
         var args = [];
         args.push("-R", reporter);
         if (tests) {
@@ -402,7 +827,7 @@ function runConsoleTests(defaultReporter, runInParallel) {
         else {
             args.push("-t", testTimeout);
         }
-        args.push(Paths.builtLocalRun);
+        args.push(run);
 
         var cmd = "mocha " + args.join(" ");
         console.log(cmd);
@@ -411,29 +836,28 @@ function runConsoleTests(defaultReporter, runInParallel) {
         process.env.NODE_ENV = "development";
         exec(cmd, function () {
             process.env.NODE_ENV = savedNodeEnv;
-            Travis.measure(startTime);
+            measure(startTime);
             runLinter();
             finish();
         }, function (e, status) {
             process.env.NODE_ENV = savedNodeEnv;
-            Travis.measure(startTime);
+            measure(startTime);
             finish(status);
         });
+
     }
     else {
         var savedNodeEnv = process.env.NODE_ENV;
         process.env.NODE_ENV = "development";
-        var startTime = Travis.mark();
-        exec(host + " " + Paths.builtLocalRun, function () {
+        var startTime = mark();
+        exec(host + " " + run, function () {
             process.env.NODE_ENV = savedNodeEnv;
-            Travis.measure(startTime);
-            var lint = jake.Task["lint"];
-            lint.addListener("complete", () => finish());
-            lint.invoke();
+            measure(startTime);
+            runLinter();
             finish();
         }, function (e, status) {
             process.env.NODE_ENV = savedNodeEnv;
-            Travis.measure(startTime);
+            measure(startTime);
             finish(status);
         });
     }
@@ -461,149 +885,92 @@ function runConsoleTests(defaultReporter, runInParallel) {
         });
         lint.invoke();
     }
+}
 
-    // used to pass data from jake command line directly to run.js
-    function writeTestConfigFile(tests, runners, light, taskConfigsFolder, workerCount, stackTraceLimit, colors, testTimeout) {
-        var testConfigContents = JSON.stringify({
-            runners: runners ? runners.split(",") : undefined,
-            test: tests ? [tests] : undefined,
-            light: light,
-            workerCount: workerCount,
-            taskConfigsFolder: taskConfigsFolder,
-            stackTraceLimit: stackTraceLimit,
-            noColor: !colors,
-            timeout: testTimeout
-        });
-        fs.writeFileSync('test.config', testConfigContents);
+desc("Runs all the tests in parallel using the built run.js file. Optional arguments are: t[ests]=category1|category2|... d[ebug]=true.");
+task("runtests-parallel", ["build-rules", "tests", builtLocalDirectory], function () {
+    runConsoleTests('min', /*runInParallel*/ true);
+}, { async: true });
+
+desc("Runs the tests using the built run.js file. Optional arguments are: t[ests]=regex r[eporter]=[list|spec|json|<more>] d[ebug]=true color[s]=false lint=true bail=false dirty=false.");
+task("runtests", ["build-rules", "tests", builtLocalDirectory], function() {
+    runConsoleTests('mocha-fivemat-progress-reporter', /*runInParallel*/ false);
+}, { async: true });
+
+desc("Generates code coverage data via instanbul");
+task("generate-code-coverage", ["tests", builtLocalDirectory], function () {
+    var testTimeout = process.env.timeout || defaultTestTimeout;
+    var cmd = 'istanbul cover node_modules/mocha/bin/_mocha -- -R min -t ' + testTimeout + ' ' + run;
+    console.log(cmd);
+    exec(cmd);
+}, { async: true });
+
+// Browser tests
+var nodeServerOutFile = "tests/webTestServer.js";
+var nodeServerInFile = "tests/webTestServer.ts";
+compileFile(nodeServerOutFile, [nodeServerInFile], [builtLocalDirectory, tscFile], [], /*useBuiltCompiler:*/ true, { noOutFile: true, lib: "es6" });
+
+desc("Runs browserify on run.js to produce a file suitable for running tests in the browser");
+task("browserify", [], function() {
+    // Shell out to `gulp`, since we do the work to handle sourcemaps correctly w/o inline maps there
+    var cmd = 'gulp browserify --silent';
+    exec(cmd);
+}, { async: true });
+
+desc("Runs the tests using the built run.js file like 'jake runtests'. Syntax is jake runtests-browser. Additional optional parameters tests=[regex], browser=[chrome|IE]");
+task("runtests-browser", ["browserify", nodeServerOutFile], function () {
+    cleanTestDirs();
+    host = "node";
+    var browser = process.env.browser || process.env.b ||  (os.platform() === "win32" ? "edge" : "chrome");
+    var runners = process.env.runners || process.env.runner || process.env.ru;
+    var tests = process.env.test || process.env.tests || process.env.t;
+    var light = process.env.light || false;
+    var testConfigFile = 'test.config';
+    if (fs.existsSync(testConfigFile)) {
+        fs.unlinkSync(testConfigFile);
+    }
+    if (tests || runners || light) {
+        writeTestConfigFile(tests, runners, light);
     }
 
-    function deleteTemporaryProjectOutput() {
-        if (fs.existsSync(path.join(Paths.baselines.local, "projectOutput/"))) {
-            jake.rmRf(path.join(Paths.baselines.local, "projectOutput/"));
-        }
+    tests = tests ? tests : '';
+    var cmd = host + " tests/webTestServer.js " + browser + " " + JSON.stringify(tests);
+    console.log(cmd);
+    exec(cmd);
+}, { async: true });
+
+function getDiffTool() {
+    var program = process.env['DIFF'];
+    if (!program) {
+        fail("Add the 'DIFF' environment variable to the path of the program you want to use.");
     }
+    return program;
 }
 
-function cleanTestDirs() {
-    // Clean the local baselines directory
-    if (fs.existsSync(Paths.baselines.local)) {
-        del.sync(Paths.baselines.local);
-    }
+// Baseline Diff
+desc("Diffs the compiler baselines using the diff tool specified by the 'DIFF' environment variable");
+task('diff', function () {
+    var cmd = '"' + getDiffTool() + '" ' + refBaseline + ' ' + localBaseline;
+    console.log(cmd);
+    exec(cmd);
+}, { async: true });
 
-    // Clean the local Rwc baselines directory
-    if (fs.existsSync(Paths.baselines.localRwc)) {
-        del.sync(Paths.baselines.localRwc);
-    }
+desc("Diffs the RWC baselines using the diff tool specified by the 'DIFF' environment variable");
+task('diff-rwc', function () {
+    var cmd = '"' + getDiffTool() + '" ' + refRwcBaseline + ' ' + localRwcBaseline;
+    console.log(cmd);
+    exec(cmd);
+}, { async: true });
 
-    jake.mkdirP(Paths.baselines.local);
-    jake.mkdirP(Paths.baselines.localRwc);
-    jake.mkdirP(Paths.baselines.localTest262);
-}
+desc("Builds the test sources and automation in debug mode");
+task("tests-debug", ["setDebugMode", "tests"]);
 
-function tsbuild(tsconfigPath, useLkg = true, done = undefined) {
-    const startCompileTime = Travis.mark();
 
-    const compilerPath = useLkg ? Paths.lkgCompiler : Paths.builtLocalCompiler;
-    const cmd = `${host} ${compilerPath} -b -v ${Array.isArray(tsconfigPath) ? tsconfigPath.join(" ") : tsconfigPath}`;
-
-    var ex = jake.createExec([cmd]);
-    // Add listeners for output and error
-    ex.addListener("stdout", function (output) {
-        process.stdout.write(output);
-    });
-    ex.addListener("stderr", function (error) {
-        process.stderr.write(error);
-    });
-    ex.addListener("cmdEnd", function () {
-        Travis.measure(startCompileTime);
-        done && done();
-    });
-    ex.addListener("error", function () {
-        fail(`Compilation of ${tsconfigPath} unsuccessful`);
-        Travis.measure(startCompileTime);
-    });
-    ex.run();
-}
-
-const Travis = {
-    mark() {
-        if (!fold.isTravis()) return;
-        var stamp = process.hrtime();
-        var id = Math.floor(Math.random() * 0xFFFFFFFF).toString(16);
-        console.log("travis_time:start:" + id + "\r");
-        return {
-            stamp: stamp,
-            id: id
-        };
-    },
-    measure(marker) {
-        if (!fold.isTravis()) return;
-        var diff = process.hrtime(marker.stamp);
-        var total = [marker.stamp[0] + diff[0], marker.stamp[1] + diff[1]];
-        console.log("travis_time:end:" + marker.id + ":start=" + toNs(marker.stamp) + ",finish=" + toNs(total) + ",duration=" + toNs(diff) + "\r");
-    }
-};
-
-function toNs(diff) {
-    return diff[0] * 1e9 + diff[1];
-}
-
-function exec(cmd, completeHandler, errorHandler) {
-    var ex = jake.createExec([cmd], /** @type {jake.ExecOptions} */({ windowsVerbatimArguments: true, interactive: true }));
-    // Add listeners for output and error
-    ex.addListener("stdout", function (output) {
-        process.stdout.write(output);
-    });
-    ex.addListener("stderr", function (error) {
-        process.stderr.write(error);
-    });
-    ex.addListener("cmdEnd", function () {
-        if (completeHandler) {
-            completeHandler();
-        }
-        complete();
-    });
-    ex.addListener("error", function (e, status) {
-        if (errorHandler) {
-            errorHandler(e, status);
-        }
-        else {
-            fail("Process exited with code " + status);
-        }
-    });
-
-    ex.run();
-}
-
-/** @param jsonPath {string} */
-function readJson(jsonPath) {
-    const jsonText = fs.readFileSync(jsonPath, "utf8");
-    const result = ts.parseConfigFileTextToJson(jsonPath, jsonText);
-    if (result.error) {
-        reportDiagnostics([result.error]);
-        throw new Error("An error occurred during parse.");
-    }
-    return result.config;
-}
-
-/** @param diagnostics {ts.Diagnostic[]} */
-function reportDiagnostics(diagnostics) {
-    console.log(diagnosticsToString(diagnostics, process.stdout.isTTY));
-}
-
-/**
- * @param diagnostics {ts.Diagnostic[]}
- * @param [pretty] {boolean}
- */
-function diagnosticsToString(diagnostics, pretty) {
-    const host = {
-        getCurrentDirectory() { return process.cwd(); },
-        getCanonicalFileName(fileName) { return fileName; },
-        getNewLine() { return os.EOL; }
-    };
-    return pretty ? ts.formatDiagnosticsWithColorAndContext(diagnostics, host) :
-        ts.formatDiagnostics(diagnostics, host);
-}
+// Makes the test results the new baseline
+desc("Makes the most recent test results the new baseline, overwriting the old baseline");
+task("baseline-accept", function () {
+    acceptBaseline(localBaseline, refBaseline);
+});
 
 function acceptBaseline(sourceFolder, targetFolder) {
     console.log('Accept baselines from ' + sourceFolder + ' to ' + targetFolder);
@@ -639,46 +1006,124 @@ function acceptBaseline(sourceFolder, targetFolder) {
     }
 }
 
-// concatenate a list of sourceFiles to a destinationFile
-function concatenateFiles(destinationFile, sourceFiles) {
-    var temp = "temptemp";
-    // append all files in sequence
-    var text = "";
-    for (var i = 0; i < sourceFiles.length; i++) {
-        if (!fs.existsSync(sourceFiles[i])) {
-            fail(sourceFiles[i] + " does not exist!");
-        }
-        if (i > 0) { text += "\n\n"; }
-        text += fs.readFileSync(sourceFiles[i]).toString().replace(/\r?\n/g, "\n");
+desc("Makes the most recent rwc test results the new baseline, overwriting the old baseline");
+task("baseline-accept-rwc", function () {
+    acceptBaseline(localRwcBaseline, refRwcBaseline);
+});
+
+desc("Makes the most recent test262 test results the new baseline, overwriting the old baseline");
+task("baseline-accept-test262", function () {
+    acceptBaseline(localTest262Baseline, refTest262Baseline);
+});
+
+
+// Webhost
+var webhostPath = "tests/webhost/webtsc.ts";
+var webhostJsPath = "tests/webhost/webtsc.js";
+compileFile(webhostJsPath, [webhostPath], [tscFile, webhostPath].concat(libraryTargets), [], /*useBuiltCompiler*/true);
+
+desc("Builds the tsc web host");
+task("webhost", [webhostJsPath], function () {
+    jake.cpR(path.join(builtLocalDirectory, "lib.d.ts"), "tests/webhost/", { silent: true });
+});
+
+// Perf compiler
+var perftscPath = "tests/perftsc.ts";
+var perftscJsPath = "built/local/perftsc.js";
+compileFile(perftscJsPath, [perftscPath], [tscFile, perftscPath, "tests/perfsys.ts"].concat(libraryTargets), [], /*useBuiltCompiler*/ true);
+desc("Builds augmented version of the compiler for perf tests");
+task("perftsc", [perftscJsPath]);
+
+// Instrumented compiler
+var loggedIOpath = harnessDirectory + 'loggedIO.ts';
+var loggedIOJsPath = builtLocalDirectory + 'loggedIO.js';
+file(loggedIOJsPath, [builtLocalDirectory, loggedIOpath], function () {
+    var temp = builtLocalDirectory + 'temp';
+    jake.mkdirP(temp);
+    var options = "--target es5 --lib es6 --types --outdir " + temp + ' ' + loggedIOpath;
+    var cmd = host + " " + LKGDirectory + compilerFilename + " " + options + " ";
+    console.log(cmd + "\n");
+    var ex = jake.createExec([cmd]);
+    ex.addListener("cmdEnd", function () {
+        fs.renameSync(temp + '/harness/loggedIO.js', loggedIOJsPath);
+        jake.rmRf(temp);
+        complete();
+    });
+    ex.run();
+}, { async: true });
+
+var instrumenterPath = harnessDirectory + 'instrumenter.ts';
+var instrumenterJsPath = builtLocalDirectory + 'instrumenter.js';
+compileFile(instrumenterJsPath, [instrumenterPath], [tscFile, instrumenterPath].concat(libraryTargets), [], /*useBuiltCompiler*/ true, { lib: "es6", types: ["node"], noOutFile: true, outDir: builtLocalDirectory });
+
+desc("Builds an instrumented tsc.js - run with test=[testname]");
+task('tsc-instrumented', [loggedIOJsPath, instrumenterJsPath, tscFile], function () {
+    var test = process.env.test || process.env.tests || process.env.t || "iocapture";
+    var cmd = host + ' ' + instrumenterJsPath + " record " + test + " " + builtLocalDirectory + compilerFilename;
+    console.log(cmd);
+    var ex = jake.createExec([cmd]);
+    ex.addListener("cmdEnd", function () {
+        complete();
+    });
+    ex.run();
+}, { async: true });
+
+desc("Updates the sublime plugin's tsserver");
+task("update-sublime", ["local", serverFile], function () {
+    jake.cpR(serverFile, "../TypeScript-Sublime-Plugin/tsserver/");
+    jake.cpR(serverFile + ".map", "../TypeScript-Sublime-Plugin/tsserver/");
+});
+
+var tslintRuleDir = "scripts/tslint/rules";
+var tslintRules = fs.readdirSync(tslintRuleDir);
+var tslintRulesFiles = tslintRules.map(function (p) {
+    return path.join(tslintRuleDir, p);
+});
+var tslintRulesOutFiles = tslintRules.map(function (p) {
+    return path.join(builtLocalDirectory, "tslint/rules", p.replace(".ts", ".js"));
+});
+var tslintFormattersDir = "scripts/tslint/formatters";
+var tslintFormatters = [
+    "autolinkableStylishFormatter",
+];
+var tslintFormatterFiles = tslintFormatters.map(function (p) {
+    return path.join(tslintFormattersDir, p + ".ts");
+});
+var tslintFormattersOutFiles = tslintFormatters.map(function (p) {
+    return path.join(builtLocalDirectory, "tslint/formatters", p + ".js");
+});
+desc("Compiles tslint rules to js");
+task("build-rules", ["build-rules-start"].concat(tslintRulesOutFiles).concat(tslintFormattersOutFiles).concat(["build-rules-end"]));
+tslintRulesFiles.forEach(function (ruleFile, i) {
+    compileFile(tslintRulesOutFiles[i], [ruleFile], [ruleFile], [], /*useBuiltCompiler*/ false,
+        { noOutFile: true, generateDeclarations: false, outDir: path.join(builtLocalDirectory, "tslint/rules"), lib: "es6" });
+});
+tslintFormatterFiles.forEach(function (ruleFile, i) {
+    compileFile(tslintFormattersOutFiles[i], [ruleFile], [ruleFile], [], /*useBuiltCompiler*/ false,
+        { noOutFile: true, generateDeclarations: false, outDir: path.join(builtLocalDirectory, "tslint/formatters"), lib: "es6" });
+});
+
+desc("Emit the start of the build-rules fold");
+task("build-rules-start", [], function () {
+    if (fold.isTravis()) console.log(fold.start("build-rules"));
+});
+
+desc("Emit the end of the build-rules fold");
+task("build-rules-end", [], function () {
+    if (fold.isTravis()) console.log(fold.end("build-rules"));
+});
+
+desc("Runs tslint on the compiler sources. Optional arguments are: f[iles]=regex");
+task("lint", ["build-rules"], () => {
+    if (fold.isTravis()) console.log(fold.start("lint"));
+    function lint(project, cb) {
+        const fix = process.env.fix || process.env.f;
+        const cmd = `node node_modules/tslint/bin/tslint --project ${project} --formatters-dir ./built/local/tslint/formatters --format autolinkableStylish${fix ? " --fix" : ""}`;
+        console.log("Linting: " + cmd);
+        jake.exec([cmd], cb, /** @type {jake.ExecOptions} */({ interactive: true, windowsVerbatimArguments: true }));
     }
-    fs.writeFileSync(temp, text);
-    // Move the file to the final destination
-    fs.renameSync(temp, destinationFile);
-}
-
-function getDiffTool() {
-    var program = process.env['DIFF'];
-    if (!program) {
-        fail("Add the 'DIFF' environment variable to the path of the program you want to use.");
-    }
-    return program;
-}
-
-function removeConstModifierFromEnumDeclarations(text) {
-    return text.replace(/^(\s*)(export )?const enum (\S+) {(\s*)$/gm, '$1$2enum $3 {$4');
-}
-
-/**
- * @param {string} path 
- */
-function readFileSync(path) {
-    return fs.readFileSync(path, { encoding: "utf-8" });
-}
-
-/**
- * @param {string} path 
- * @param {string} contents
- */
-function writeFileSync(path, contents) {
-    fs.writeFileSync(path, contents, { encoding: "utf-8" });
-}
+    lint("scripts/tslint/tsconfig.json", () => lint("src/tsconfig-base.json", () => {
+        if (fold.isTravis()) console.log(fold.end("lint"));
+        complete();
+    }));
+});

From ab10b8620549194be3ceed19dc34a6573485e005 Mon Sep 17 00:00:00 2001
From: Ryan Cavanaugh <the.ryan.cavanaugh@gmail.com>
Date: Sun, 10 Jun 2018 19:28:38 -0700
Subject: [PATCH 27/37] Almost working?

---
 Jakefile.js                                   | 254 ++++++++++--------
 scripts/buildProtocol.ts                      |  15 +-
 src/compiler/tsconfig.json                    |   1 -
 src/harness/tsconfig.json                     |   1 +
 src/{services => jsTyping}/jsTyping.ts        |   0
 src/{services => jsTyping}/semver.ts          |   0
 src/{server => jsTyping}/shared.ts            |   0
 src/jsTyping/tsconfig.json                    |  23 ++
 src/jsTyping/types.ts                         | 110 ++++++++
 .../moduleNameResolver.ts                     |   0
 src/parser/tsconfig.json                      |   3 +-
 src/server/tsconfig.json                      |   2 +-
 src/server/types.ts                           | 108 --------
 src/services/tsconfig.json                    |   7 +-
 src/testRunner/tsconfig.json                  |  62 ++++-
 src/{ => testRunner}/unittests/asserts.ts     |   0
 src/{ => testRunner}/unittests/base64.ts      |   0
 src/{ => testRunner}/unittests/builder.ts     |   0
 .../cancellableLanguageServiceOperations.ts   |   0
 .../unittests/commandLineParsing.ts           |   0
 .../unittests/compileOnSave.ts                |   0
 .../unittests/configurationExtension.ts       |   0
 .../convertCompilerOptionsFromJson.ts         |   0
 .../unittests/convertToBase64.ts              |   0
 .../convertTypeAcquisitionFromJson.ts         |   0
 .../unittests/customTransforms.ts             |   0
 .../unittests/evaluation/asyncArrow.ts        |   0
 .../unittests/evaluation/asyncGenerator.ts    |   0
 .../unittests/evaluation/forAwaitOf.ts        |   0
 .../unittests/extractConstants.ts             |   0
 .../unittests/extractFunctions.ts             |   0
 .../unittests/extractRanges.ts                |   0
 .../unittests/extractTestHelpers.ts           |   0
 .../unittests/hostNewLineSupport.ts           |   0
 .../unittests/incrementalParser.ts            |   0
 .../unittests/initializeTSConfig.ts           |   0
 .../unittests/jsDocParsing.ts                 |   0
 .../unittests/languageService.ts              |   0
 src/{ => testRunner}/unittests/matchFiles.ts  |   0
 .../unittests/moduleResolution.ts             |   0
 .../unittests/organizeImports.ts              |   0
 src/{ => testRunner}/unittests/paths.ts       |   0
 src/{ => testRunner}/unittests/printer.ts     |   0
 .../unittests/programMissingFiles.ts          |   0
 .../unittests/programNoParseFalsyFileNames.ts |   0
 .../unittests/projectErrors.ts                |   0
 .../unittests/projectReferences.ts            |   0
 src/{ => testRunner}/unittests/publicApi.ts   |   0
 .../unittests/reuseProgramStructure.ts        |   0
 .../unittests/services/colorization.ts        |   0
 .../unittests/services/documentRegistry.ts    |   0
 .../unittests/services/patternMatcher.ts      |   0
 .../unittests/services/preProcessFile.ts      |   0
 src/{ => testRunner}/unittests/session.ts     |   0
 .../unittests/symbolWalker.ts                 |   0
 src/{ => testRunner}/unittests/telemetry.ts   |   0
 src/{ => testRunner}/unittests/textChanges.ts |   0
 src/{ => testRunner}/unittests/textStorage.ts |   0
 src/{ => testRunner}/unittests/transform.ts   |   0
 src/{ => testRunner}/unittests/transpile.ts   |   0
 src/{ => testRunner}/unittests/tsbuild.ts     |   0
 .../unittests/tscWatchMode.ts                 |   0
 .../unittests/tsconfigParsing.ts              |   0
 .../unittests/tsserverProjectSystem.ts        |   0
 .../unittests/typingsInstaller.ts             |   0
 .../unittests/versionCache.ts                 |   2 +-
 src/tsconfig-base.json                        |   1 +
 src/tsserver/tsconfig.json                    |   1 +
 src/tsserverLibrary/tsconfig.json             |   3 +-
 src/typescriptServices/empty.ts               |   1 +
 src/typescriptServices/tsconfig.json          |  20 ++
 src/typingsInstaller/tsconfig.json            |   7 +-
 src/typingsInstallerCore/tsconfig.json        |   6 +-
 src/unittests/tsconfig.json                   |  23 --
 74 files changed, 377 insertions(+), 273 deletions(-)
 rename src/{services => jsTyping}/jsTyping.ts (100%)
 rename src/{services => jsTyping}/semver.ts (100%)
 rename src/{server => jsTyping}/shared.ts (100%)
 create mode 100644 src/jsTyping/tsconfig.json
 create mode 100644 src/jsTyping/types.ts
 rename src/{compiler => parser}/moduleNameResolver.ts (100%)
 rename src/{ => testRunner}/unittests/asserts.ts (100%)
 rename src/{ => testRunner}/unittests/base64.ts (100%)
 rename src/{ => testRunner}/unittests/builder.ts (100%)
 rename src/{ => testRunner}/unittests/cancellableLanguageServiceOperations.ts (100%)
 rename src/{ => testRunner}/unittests/commandLineParsing.ts (100%)
 rename src/{ => testRunner}/unittests/compileOnSave.ts (100%)
 rename src/{ => testRunner}/unittests/configurationExtension.ts (100%)
 rename src/{ => testRunner}/unittests/convertCompilerOptionsFromJson.ts (100%)
 rename src/{ => testRunner}/unittests/convertToBase64.ts (100%)
 rename src/{ => testRunner}/unittests/convertTypeAcquisitionFromJson.ts (100%)
 rename src/{ => testRunner}/unittests/customTransforms.ts (100%)
 rename src/{ => testRunner}/unittests/evaluation/asyncArrow.ts (100%)
 rename src/{ => testRunner}/unittests/evaluation/asyncGenerator.ts (100%)
 rename src/{ => testRunner}/unittests/evaluation/forAwaitOf.ts (100%)
 rename src/{ => testRunner}/unittests/extractConstants.ts (100%)
 rename src/{ => testRunner}/unittests/extractFunctions.ts (100%)
 rename src/{ => testRunner}/unittests/extractRanges.ts (100%)
 rename src/{ => testRunner}/unittests/extractTestHelpers.ts (100%)
 rename src/{ => testRunner}/unittests/hostNewLineSupport.ts (100%)
 rename src/{ => testRunner}/unittests/incrementalParser.ts (100%)
 rename src/{ => testRunner}/unittests/initializeTSConfig.ts (100%)
 rename src/{ => testRunner}/unittests/jsDocParsing.ts (100%)
 rename src/{ => testRunner}/unittests/languageService.ts (100%)
 rename src/{ => testRunner}/unittests/matchFiles.ts (100%)
 rename src/{ => testRunner}/unittests/moduleResolution.ts (100%)
 rename src/{ => testRunner}/unittests/organizeImports.ts (100%)
 rename src/{ => testRunner}/unittests/paths.ts (100%)
 rename src/{ => testRunner}/unittests/printer.ts (100%)
 rename src/{ => testRunner}/unittests/programMissingFiles.ts (100%)
 rename src/{ => testRunner}/unittests/programNoParseFalsyFileNames.ts (100%)
 rename src/{ => testRunner}/unittests/projectErrors.ts (100%)
 rename src/{ => testRunner}/unittests/projectReferences.ts (100%)
 rename src/{ => testRunner}/unittests/publicApi.ts (100%)
 rename src/{ => testRunner}/unittests/reuseProgramStructure.ts (100%)
 rename src/{ => testRunner}/unittests/services/colorization.ts (100%)
 rename src/{ => testRunner}/unittests/services/documentRegistry.ts (100%)
 rename src/{ => testRunner}/unittests/services/patternMatcher.ts (100%)
 rename src/{ => testRunner}/unittests/services/preProcessFile.ts (100%)
 rename src/{ => testRunner}/unittests/session.ts (100%)
 rename src/{ => testRunner}/unittests/symbolWalker.ts (100%)
 rename src/{ => testRunner}/unittests/telemetry.ts (100%)
 rename src/{ => testRunner}/unittests/textChanges.ts (100%)
 rename src/{ => testRunner}/unittests/textStorage.ts (100%)
 rename src/{ => testRunner}/unittests/transform.ts (100%)
 rename src/{ => testRunner}/unittests/transpile.ts (100%)
 rename src/{ => testRunner}/unittests/tsbuild.ts (100%)
 rename src/{ => testRunner}/unittests/tscWatchMode.ts (100%)
 rename src/{ => testRunner}/unittests/tsconfigParsing.ts (100%)
 rename src/{ => testRunner}/unittests/tsserverProjectSystem.ts (100%)
 rename src/{ => testRunner}/unittests/typingsInstaller.ts (100%)
 rename src/{ => testRunner}/unittests/versionCache.ts (97%)
 create mode 100644 src/typescriptServices/empty.ts
 create mode 100644 src/typescriptServices/tsconfig.json
 delete mode 100644 src/unittests/tsconfig.json

diff --git a/Jakefile.js b/Jakefile.js
index a6483355c73..704be5a15bd 100644
--- a/Jakefile.js
+++ b/Jakefile.js
@@ -11,6 +11,7 @@ var ts = require("./lib/typescript");
 const getDirSize = require("./scripts/build/getDirSize");
 
 // Variables
+var parserDirectory = "src/parser/";
 var compilerDirectory = "src/compiler/";
 var serverDirectory = "src/server/";
 var harnessDirectory = "src/harness/";
@@ -29,6 +30,9 @@ var thirdParty = "ThirdPartyNoticeText.txt";
 
 var defaultTestTimeout = 40000;
 
+// Task to build the tests infrastructure using the built compiler
+var run = path.join(builtLocalDirectory, "run.js");
+
 // add node_modules to path so we don't need global modules, prefer the modules by adding them first
 var nodeModulesPathPrefix = path.resolve("./node_modules/.bin/") + path.delimiter;
 if (process.env.path !== undefined) {
@@ -79,6 +83,17 @@ function filesFromConfig(configPath) {
     return configFileContent.fileNames;
 }
 
+/** @param configPath {string} */
+function filesAndOutputFromConfig(configPath) {
+    const config = readJson(configPath);
+    const configFileContent = ts.parseJsonConfigFileContent(config, ts.sys, path.dirname(configPath));
+    if (configFileContent.errors && configFileContent.errors.length) {
+        reportDiagnostics(configFileContent.errors);
+        throw new Error("An error occurred during parse.");
+    }
+    return { files: configFileContent.fileNames, output: configFileContent.options.outFile };
+}
+
 function toNs(diff) {
     return diff[0] * 1e9 + diff[1];
 }
@@ -102,17 +117,55 @@ function measure(marker) {
 }
 
 function removeConstModifierFromEnumDeclarations(text) {
-     return text.replace(/^(\s*)(export )?const enum (\S+) {(\s*)$/gm, '$1$2enum $3 {$4');
+    return text.replace(/^(\s*)(export )?const enum (\S+) {(\s*)$/gm, '$1$2enum $3 {$4');
 }
 
-var compilerSources = filesFromConfig("./src/compiler/tsconfig.json");
-var servicesSources = filesFromConfig("./src/services/tsconfig.json");
-var cancellationTokenSources = filesFromConfig(path.join(serverDirectory, "cancellationToken/tsconfig.json"));
-var typingsInstallerSources = filesFromConfig(path.join(serverDirectory, "typingsInstaller/tsconfig.json"));
-var watchGuardSources = filesFromConfig(path.join(serverDirectory, "watchGuard/tsconfig.json"));
-var serverSources = filesFromConfig(path.join(serverDirectory, "tsconfig.json"));
-var languageServiceLibrarySources = filesFromConfig(path.join(serverDirectory, "tsconfig.library.json"));
-var harnessSources = filesFromConfig("./src/harness/tsconfig.json");
+compileOutputConfigFile('src/parser/tsconfig.json');
+compileOutputConfigFile('src/compiler/tsconfig.json');
+compileOutputConfigFile('src/services/tsconfig.json');
+compileOutputConfigFile('src/typescriptServices/tsconfig.json', [], [copyright], function () {
+    jake.cpR(servicesFile, nodePackageFile, { silent: true });
+
+    prependFile(copyright, standaloneDefinitionsFile);
+
+    // Stanalone/web definition file using global 'ts' namespace
+    jake.cpR(standaloneDefinitionsFile, nodeDefinitionsFile, { silent: true });
+    var definitionFileContents = fs.readFileSync(nodeDefinitionsFile).toString();
+    definitionFileContents = removeConstModifierFromEnumDeclarations(definitionFileContents);
+    fs.writeFileSync(standaloneDefinitionsFile, definitionFileContents);
+
+    // Official node package definition file, pointed to by 'typings' in package.json
+    // Created by appending 'export = ts;' at the end of the standalone file to turn it into an external module
+    var nodeDefinitionsFileContents = definitionFileContents + "\nexport = ts;";
+    fs.writeFileSync(nodeDefinitionsFile, nodeDefinitionsFileContents);
+
+    // Node package definition file to be distributed without the package. Created by replacing
+    // 'ts' namespace with '"typescript"' as a module.
+    var nodeStandaloneDefinitionsFileContents = definitionFileContents.replace(/declare (namespace|module) ts/g, 'declare module "typescript"');
+    fs.writeFileSync(nodeStandaloneDefinitionsFile, nodeStandaloneDefinitionsFileContents);
+});
+compileOutputConfigFile('src/core/tsconfig.json');
+compileOutputConfigFile('src/harness/tsconfig.json');
+compileOutputConfigFile('src/testRunner/tsconfig.json');
+compileOutputConfigFile('src/tsc/tsconfig.json', [], [copyright]);
+compileOutputConfigFile('src/server/tsconfig.json', [], [copyright]);
+compileOutputConfigFile('src/tsserver/tsconfig.json', [], [copyright]);
+compileOutputConfigFile('src/tsserverLibrary/tsconfig.json', [], [], function () {
+    prependFile(copyright, tsserverLibraryDefinitionFile);
+
+    // Appending exports at the end of the server library
+    var tsserverLibraryDefinitionFileContents =
+        fs.readFileSync(tsserverLibraryDefinitionFile).toString() +
+        "\nexport = ts;" +
+        "\nexport as namespace ts;";
+    tsserverLibraryDefinitionFileContents = removeConstModifierFromEnumDeclarations(tsserverLibraryDefinitionFileContents);
+
+    fs.writeFileSync(tsserverLibraryDefinitionFile, tsserverLibraryDefinitionFileContents);
+});
+compileOutputConfigFile('src/typingsInstaller/tsconfig.json');
+compileOutputConfigFile('src/typingsInstallerCore/tsconfig.json');
+compileOutputConfigFile('src/watchGuard/tsconfig.json');
+compileConfigFile('built/local/cancellationToken.js', [], 'src/cancellationToken/tsconfig.json', [copyright]);
 
 var typesMapOutputPath = path.join(builtLocalDirectory, 'typesMap.json');
 
@@ -173,6 +226,51 @@ var compilerFilename = "tsc.js";
 var LKGCompiler = path.join(LKGDirectory, compilerFilename);
 var builtLocalCompiler = path.join(builtLocalDirectory, compilerFilename);
 
+function compileOutputConfigFile(configFile, prereqs, prefixes, callback) {
+    const info = filesAndOutputFromConfig(configFile);
+    compileConfigFile(info.output, prereqs, configFile, prefixes, false, callback);
+}
+
+function compileConfigFile(outFile, prereqs, configFile, prefixes, useBuiltCompiler = false, callback) {
+    const allPrereqs = filesFromConfig(configFile).concat(prereqs || []).concat(configFile);
+    outFile = outFile.replace(/\//g, "\\");
+    file(outFile, allPrereqs, function () {
+        const startCompileTime = mark();
+        const compilerPath = useBuiltCompiler ? builtLocalCompiler : LKGCompiler;
+        const cmd = `${host} ${compilerPath} -b -v ${configFile}`;
+        console.log(cmd + "\n");
+
+        var ex = jake.createExec([cmd]);
+        // Add listeners for output and error
+        ex.addListener("stdout", function (output) {
+            process.stdout.write(output);
+        });
+        ex.addListener("stderr", function (error) {
+            process.stderr.write(error);
+        });
+        ex.addListener("cmdEnd", function () {
+            if (!useDebugMode && prefixes && fs.existsSync(outFile)) {
+                for (var i in prefixes) {
+                    prependFile(prefixes[i], outFile);
+                }
+            }
+
+            if (callback) {
+                callback();
+            }
+
+            measure(startCompileTime);
+            complete();
+        });
+        ex.addListener("error", function () {
+            fs.unlinkSync(outFile);
+            fail("Compilation of " + outFile + " unsuccessful");
+            measure(startCompileTime);
+        });
+        ex.run();
+    }, { async: true });
+}
+
 /**
  * Compiles a file from a list of sources
  * @param {string} outFile the target file name
@@ -194,7 +292,7 @@ var builtLocalCompiler = path.join(builtLocalDirectory, compilerFilename);
  * @param {function(): void} [callback] a function to execute after the compilation process ends
  */
 function compileFile(outFile, sources, prereqs, prefixes, useBuiltCompiler, opts, callback) {
-    file(outFile, prereqs, function() {
+    file(outFile, prereqs, function () {
         var startCompileTime = mark();
         opts = opts || {};
         var compilerPath = useBuiltCompiler ? builtLocalCompiler : LKGCompiler;
@@ -245,7 +343,7 @@ function compileFile(outFile, sources, prereqs, prefixes, useBuiltCompiler, opts
         if (opts.stripInternal) {
             options += " --stripInternal";
         }
-        options +=  " --target es5";
+        options += " --target es5";
         if (opts.lib) {
             options += " --lib " + opts.lib;
         }
@@ -310,29 +408,18 @@ task("lib", libraryTargets);
 
 // Generate diagnostics
 var processDiagnosticMessagesJs = path.join(scriptsDirectory, "processDiagnosticMessages.js");
-var processDiagnosticMessagesTs = path.join(scriptsDirectory, "processDiagnosticMessages.ts");
-var processDiagnosticMessagesSources = filesFromConfig("./scripts/processDiagnosticMessages.tsconfig.json");
+var diagnosticMessagesJson = path.join(parserDirectory, "diagnosticMessages.json");
+var diagnosticInfoMapTs = path.join(parserDirectory, "diagnosticInformationMap.generated.ts");
+compileConfigFile(processDiagnosticMessagesJs, [], "./scripts/processDiagnosticMessages.tsconfig.json")
 
-var diagnosticMessagesJson = path.join(compilerDirectory, "diagnosticMessages.json");
-var diagnosticInfoMapTs = path.join(compilerDirectory, "diagnosticInformationMap.generated.ts");
-var generatedDiagnosticMessagesJSON = path.join(compilerDirectory, "diagnosticMessages.generated.json");
+var generatedDiagnosticMessagesJSON = path.join(parserDirectory, "diagnosticMessages.generated.json");
 var builtGeneratedDiagnosticMessagesJSON = path.join(builtLocalDirectory, "diagnosticMessages.generated.json");
 
-file(processDiagnosticMessagesTs);
-
-// processDiagnosticMessages script
-compileFile(processDiagnosticMessagesJs,
-    processDiagnosticMessagesSources,
-    processDiagnosticMessagesSources,
-    [],
-    /*useBuiltCompiler*/ false);
-
 // Localize diagnostics script
 var generateLocalizedDiagnosticMessagesJs = path.join(scriptsDirectory, "generateLocalizedDiagnosticMessages.js");
 var generateLocalizedDiagnosticMessagesTs = path.join(scriptsDirectory, "generateLocalizedDiagnosticMessages.ts");
 
 file(generateLocalizedDiagnosticMessagesTs);
-
 compileFile(generateLocalizedDiagnosticMessagesJs,
     [generateLocalizedDiagnosticMessagesTs],
     [generateLocalizedDiagnosticMessagesTs],
@@ -373,11 +460,11 @@ compileFile(buildProtocolJs,
     /*useBuiltCompiler*/ false,
     { noOutFile: true, lib: "es6" });
 
-file(buildProtocolDts, [buildProtocolTs, buildProtocolJs, typescriptServicesDts], function() {
+file(buildProtocolDts, [buildProtocolTs, buildProtocolJs, typescriptServicesDts], function () {
 
     var protocolTs = path.join(serverDirectory, "protocol.ts");
 
-    var cmd = host + " " + buildProtocolJs + " "+ protocolTs + " " + typescriptServicesDts + " " + buildProtocolDts;
+    var cmd = host + " " + buildProtocolJs + " " + protocolTs + " " + typescriptServicesDts + " " + buildProtocolDts;
     console.log(cmd);
     var ex = jake.createExec([cmd]);
     // Add listeners for output and error
@@ -390,6 +477,9 @@ file(buildProtocolDts, [buildProtocolTs, buildProtocolJs, typescriptServicesDts]
     ex.addListener("cmdEnd", function () {
         complete();
     });
+    ex.addListener("error", function (e, status) {
+        fail("Process exited with code " + status);
+    });
     ex.run();
 }, { async: true });
 
@@ -482,65 +572,22 @@ task("importDefinitelyTypedTests", [importDefinitelyTypedTestsJs], function () {
     exec(cmd);
 }, { async: true });
 
-// Local target to build the compiler and services
-var tscFile = path.join(builtLocalDirectory, compilerFilename);
-compileFile(tscFile, compilerSources, [builtLocalDirectory, copyright].concat(compilerSources), [copyright], /*useBuiltCompiler:*/ false);
-
+var tscFile = path.join(builtLocalDirectory, "tsc.js");
+var cancellationTokenFile = path.join(builtLocalDirectory, "cancellationToken.js");
+var watchGuardFile = path.join(builtLocalDirectory, "watchGuard.js");
+var serverFile = path.join(builtLocalDirectory, "tsserver.js");
+var typingsInstallerFile = path.join(builtLocalDirectory, "typingsInstaller.js");
 var servicesFile = path.join(builtLocalDirectory, "typescriptServices.js");
 var standaloneDefinitionsFile = path.join(builtLocalDirectory, "typescriptServices.d.ts");
 var nodePackageFile = path.join(builtLocalDirectory, "typescript.js");
 var nodeDefinitionsFile = path.join(builtLocalDirectory, "typescript.d.ts");
 var nodeStandaloneDefinitionsFile = path.join(builtLocalDirectory, "typescript_standalone.d.ts");
-
-compileFile(servicesFile, servicesSources, [builtLocalDirectory, copyright].concat(servicesSources),
-            /*prefixes*/[copyright],
-            /*useBuiltCompiler*/ true,
-            /*opts*/ {
-        noOutFile: false,
-        generateDeclarations: true,
-        preserveConstEnums: true,
-        keepComments: true,
-        noResolve: false,
-        stripInternal: true
-    },
-            /*callback*/ function () {
-        jake.cpR(servicesFile, nodePackageFile, { silent: true });
-
-        prependFile(copyright, standaloneDefinitionsFile);
-
-        // Stanalone/web definition file using global 'ts' namespace
-        jake.cpR(standaloneDefinitionsFile, nodeDefinitionsFile, { silent: true });
-        var definitionFileContents = fs.readFileSync(nodeDefinitionsFile).toString();
-        definitionFileContents = removeConstModifierFromEnumDeclarations(definitionFileContents);
-        fs.writeFileSync(standaloneDefinitionsFile, definitionFileContents);
-
-        // Official node package definition file, pointed to by 'typings' in package.json
-        // Created by appending 'export = ts;' at the end of the standalone file to turn it into an external module
-        var nodeDefinitionsFileContents = definitionFileContents + "\nexport = ts;";
-        fs.writeFileSync(nodeDefinitionsFile, nodeDefinitionsFileContents);
-
-        // Node package definition file to be distributed without the package. Created by replacing
-        // 'ts' namespace with '"typescript"' as a module.
-        var nodeStandaloneDefinitionsFileContents = definitionFileContents.replace(/declare (namespace|module) ts/g, 'declare module "typescript"');
-        fs.writeFileSync(nodeStandaloneDefinitionsFile, nodeStandaloneDefinitionsFileContents);
-    });
+var tsserverLibraryFile = path.join(builtLocalDirectory, "tsserverlibrary.js");
+var tsserverLibraryDefinitionFile = path.join(builtLocalDirectory, "tsserverlibrary.d.ts");
 
 file(typescriptServicesDts, [servicesFile]);
 
-var cancellationTokenFile = path.join(builtLocalDirectory, "cancellationToken.js");
-compileFile(cancellationTokenFile, cancellationTokenSources, [builtLocalDirectory].concat(cancellationTokenSources), /*prefixes*/ [copyright], /*useBuiltCompiler*/ true, { types: ["node"], outDir: builtLocalDirectory, noOutFile: true, lib: "es6" });
-
-var typingsInstallerFile = path.join(builtLocalDirectory, "typingsInstaller.js");
-compileFile(typingsInstallerFile, typingsInstallerSources, [builtLocalDirectory].concat(typingsInstallerSources), /*prefixes*/ [copyright], /*useBuiltCompiler*/ true, { types: ["node"], outDir: builtLocalDirectory, noOutFile: false, lib: "es6" });
-
-var watchGuardFile = path.join(builtLocalDirectory, "watchGuard.js");
-compileFile(watchGuardFile, watchGuardSources, [builtLocalDirectory].concat(watchGuardSources), /*prefixes*/ [copyright], /*useBuiltCompiler*/ true, { types: ["node"], outDir: builtLocalDirectory, noOutFile: false, lib: "es6" });
-
-var serverFile = path.join(builtLocalDirectory, "tsserver.js");
-compileFile(serverFile, serverSources, [builtLocalDirectory, copyright, cancellationTokenFile, typingsInstallerFile, watchGuardFile].concat(serverSources).concat(servicesSources), /*prefixes*/ [copyright], /*useBuiltCompiler*/ true, { types: ["node"], preserveConstEnums: true, lib: "es6" });
-var tsserverLibraryFile = path.join(builtLocalDirectory, "tsserverlibrary.js");
-var tsserverLibraryDefinitionFile = path.join(builtLocalDirectory, "tsserverlibrary.d.ts");
-file(typesMapOutputPath, /** @type {*} */(function() {
+file(typesMapOutputPath, /** @type {*} */(function () {
     var content = fs.readFileSync(path.join(serverDirectory, 'typesMap.json'));
     // Validate that it's valid JSON
     try {
@@ -550,25 +597,6 @@ file(typesMapOutputPath, /** @type {*} */(function() {
     }
     fs.writeFileSync(typesMapOutputPath, content);
 }));
-compileFile(
-    tsserverLibraryFile,
-    languageServiceLibrarySources,
-    [builtLocalDirectory, copyright, builtLocalCompiler].concat(languageServiceLibrarySources).concat(libraryTargets),
-    /*prefixes*/[copyright],
-    /*useBuiltCompiler*/ true,
-    { noOutFile: false, generateDeclarations: true, stripInternal: true, preserveConstEnums: true, keepComments: true },
-    /*callback*/ function () {
-        prependFile(copyright, tsserverLibraryDefinitionFile);
-
-        // Appending exports at the end of the server library
-        var tsserverLibraryDefinitionFileContents =
-            fs.readFileSync(tsserverLibraryDefinitionFile).toString() +
-            "\nexport = ts;" +
-            "\nexport as namespace ts;";
-        tsserverLibraryDefinitionFileContents = removeConstModifierFromEnumDeclarations(tsserverLibraryDefinitionFileContents);
-
-        fs.writeFileSync(tsserverLibraryDefinitionFile, tsserverLibraryDefinitionFileContents);
-    });
 
 // Local target to build the language service server library
 desc("Builds language service server library");
@@ -586,7 +614,7 @@ task("build-fold-end", [], function () {
 
 // Local target to build the compiler and services
 desc("Builds the full compiler and services");
-task("local", ["build-fold-start", "generate-diagnostics", "lib", tscFile, servicesFile, nodeDefinitionsFile, serverFile, buildProtocolDts, builtGeneratedDiagnosticMessagesJSON, "lssl", "localize", "build-fold-end"]);
+task("local", ["build-fold-start", "generate-diagnostics", "lib", tscFile, servicesFile, typingsInstallerFile, nodeDefinitionsFile, serverFile, buildProtocolDts, builtGeneratedDiagnosticMessagesJSON, run, "lssl", "localize", "build-fold-end"]);
 
 // Local target to build only tsc.js
 desc("Builds only the compiler");
@@ -655,7 +683,15 @@ task("LKG", ["clean", "release", "local"].concat(libraryTargets), () => {
     }
     // Copy all the targets into the LKG directory
     jake.mkdirP(LKGDirectory);
-    expectedFiles.forEach(f => jake.cpR(f, LKGDirectory));
+    expectedFiles.forEach(f => {
+        if (f.endsWith(".d.ts")) {
+            // remove-internal all the .d.ts files
+            jake.createExec([host, "node_modules/remove-internal/lib/cli.js", f, "--outdir", LKGDirectory]).run();
+        }
+        else {
+            jake.cpR(f, LKGDirectory);
+        }
+    });
 
     const sizeAfter = getDirSize(LKGDirectory);
     if (sizeAfter > (sizeBefore * 1.10)) {
@@ -666,16 +702,6 @@ task("LKG", ["clean", "release", "local"].concat(libraryTargets), () => {
 // Test directory
 directory(builtLocalDirectory);
 
-// Task to build the tests infrastructure using the built compiler
-var run = path.join(builtLocalDirectory, "run.js");
-compileFile(
-    /*outFile*/ run,
-    /*source*/ harnessSources,
-    /*prereqs*/[builtLocalDirectory, tscFile, tsserverLibraryFile].concat(libraryTargets).concat(servicesSources).concat(harnessSources),
-    /*prefixes*/[],
-    /*useBuiltCompiler:*/ true,
-    /*opts*/ { types: ["node", "mocha", "chai"], lib: "es6" });
-
 var internalTests = "internal/";
 
 var localBaseline = "tests/baselines/local/";
@@ -888,12 +914,12 @@ function runConsoleTests(defaultReporter, runInParallel) {
 }
 
 desc("Runs all the tests in parallel using the built run.js file. Optional arguments are: t[ests]=category1|category2|... d[ebug]=true.");
-task("runtests-parallel", ["build-rules", "tests", builtLocalDirectory], function () {
+task("runtests-parallel", ["build-rules", "tests", builtLocalDirectory, run], function () {
     runConsoleTests('min', /*runInParallel*/ true);
 }, { async: true });
 
 desc("Runs the tests using the built run.js file. Optional arguments are: t[ests]=regex r[eporter]=[list|spec|json|<more>] d[ebug]=true color[s]=false lint=true bail=false dirty=false.");
-task("runtests", ["build-rules", "tests", builtLocalDirectory], function() {
+task("runtests", ["build-rules", "tests", builtLocalDirectory, run], function () {
     runConsoleTests('mocha-fivemat-progress-reporter', /*runInParallel*/ false);
 }, { async: true });
 
@@ -911,7 +937,7 @@ var nodeServerInFile = "tests/webTestServer.ts";
 compileFile(nodeServerOutFile, [nodeServerInFile], [builtLocalDirectory, tscFile], [], /*useBuiltCompiler:*/ true, { noOutFile: true, lib: "es6" });
 
 desc("Runs browserify on run.js to produce a file suitable for running tests in the browser");
-task("browserify", [], function() {
+task("browserify", [], function () {
     // Shell out to `gulp`, since we do the work to handle sourcemaps correctly w/o inline maps there
     var cmd = 'gulp browserify --silent';
     exec(cmd);
@@ -921,7 +947,7 @@ desc("Runs the tests using the built run.js file like 'jake runtests'. Syntax is
 task("runtests-browser", ["browserify", nodeServerOutFile], function () {
     cleanTestDirs();
     host = "node";
-    var browser = process.env.browser || process.env.b ||  (os.platform() === "win32" ? "edge" : "chrome");
+    var browser = process.env.browser || process.env.b || (os.platform() === "win32" ? "edge" : "chrome");
     var runners = process.env.runners || process.env.runner || process.env.ru;
     var tests = process.env.test || process.env.tests || process.env.t;
     var light = process.env.light || false;
diff --git a/scripts/buildProtocol.ts b/scripts/buildProtocol.ts
index 65bb0f01083..7d32473f723 100644
--- a/scripts/buildProtocol.ts
+++ b/scripts/buildProtocol.ts
@@ -46,7 +46,7 @@ class DeclarationsWalker {
         if (!s) {
             return;
         }
-        if (s.name === "Array") {
+        if (s.name === "Array" || s.name === "ReadOnlyArray") {
             // we should process type argument instead
             return this.processType((<any>type).typeArguments[0]);
         }
@@ -55,7 +55,7 @@ class DeclarationsWalker {
             if (declarations) {
                 for (const decl of declarations) {
                     const sourceFile = decl.getSourceFile();
-                    if (sourceFile === this.protocolFile || path.basename(sourceFile.fileName) === "lib.d.ts") {
+                    if (sourceFile === this.protocolFile || /lib\.(.*)\.d.ts/.test(path.basename(sourceFile.fileName))) {
                         return;
                     }
                     if (decl.kind === ts.SyntaxKind.EnumDeclaration && !isStringEnum(decl as ts.EnumDeclaration)) {
@@ -131,13 +131,20 @@ function writeProtocolFile(outputFile: string, protocolTs: string, typeScriptSer
         const program = ts.createProgram([protocolTs, typeScriptServicesDts], options);
 
         let protocolDts: string | undefined;
-        program.emit(program.getSourceFile(protocolTs), (file, content) => {
+        const emitResult = program.emit(program.getSourceFile(protocolTs), (file, content) => {
             if (endsWith(file, ".d.ts")) {
                 protocolDts = content;
             }
         });
+
         if (protocolDts === undefined) {
-            throw new Error(`Declaration file for protocol.ts is not generated`)
+            const diagHost: ts.FormatDiagnosticsHost = {
+                getCanonicalFileName: function (f) { return f; },
+                getCurrentDirectory: function() { return '.'; },
+                getNewLine: function() { return "\r\n"; }
+            }
+            const diags = emitResult.diagnostics.map(d => ts.formatDiagnostic(d, diagHost)).join("\r\n");
+            throw new Error(`Declaration file for protocol.ts is not generated:\r\n${diags}`);
         }
         return protocolDts;
     }
diff --git a/src/compiler/tsconfig.json b/src/compiler/tsconfig.json
index 8a7ba50c62c..718de7e257a 100644
--- a/src/compiler/tsconfig.json
+++ b/src/compiler/tsconfig.json
@@ -6,7 +6,6 @@
     "files": [
         "binder.ts",
         "symbolWalker.ts",
-        "moduleNameResolver.ts",
         "checker.ts",
         "factory.ts",
         "visitor.ts",
diff --git a/src/harness/tsconfig.json b/src/harness/tsconfig.json
index a2f12e244af..b1f2558f861 100644
--- a/src/harness/tsconfig.json
+++ b/src/harness/tsconfig.json
@@ -15,6 +15,7 @@
         { "path": "../parser" },
         { "path": "../compiler" },
         { "path": "../services" },
+        { "path": "../jsTyping" },
         { "path": "../server" },
         { "path": "../typingsInstallerCore" }
     ],
diff --git a/src/services/jsTyping.ts b/src/jsTyping/jsTyping.ts
similarity index 100%
rename from src/services/jsTyping.ts
rename to src/jsTyping/jsTyping.ts
diff --git a/src/services/semver.ts b/src/jsTyping/semver.ts
similarity index 100%
rename from src/services/semver.ts
rename to src/jsTyping/semver.ts
diff --git a/src/server/shared.ts b/src/jsTyping/shared.ts
similarity index 100%
rename from src/server/shared.ts
rename to src/jsTyping/shared.ts
diff --git a/src/jsTyping/tsconfig.json b/src/jsTyping/tsconfig.json
new file mode 100644
index 00000000000..86ebfe8af5a
--- /dev/null
+++ b/src/jsTyping/tsconfig.json
@@ -0,0 +1,23 @@
+{
+    "extends": "../tsconfig-base",
+    "compilerOptions": {
+        "outFile": "../../built/local/jsTyping.js",
+        "types": [
+            "node"
+        ],
+        "lib": [
+            "es6",
+            "scripthost"
+        ]
+    },
+    "references": [
+        { "path": "../core" },
+        { "path": "../parser" }
+    ],
+    "files": [
+        "shared.ts",
+        "types.ts",
+        "jsTyping.ts",
+        "semver.ts"
+    ]
+}
diff --git a/src/jsTyping/types.ts b/src/jsTyping/types.ts
new file mode 100644
index 00000000000..4e00c2eb6f5
--- /dev/null
+++ b/src/jsTyping/types.ts
@@ -0,0 +1,110 @@
+declare namespace ts.server {
+    export type ActionSet = "action::set";
+    export type ActionInvalidate = "action::invalidate";
+    export type ActionPackageInstalled = "action::packageInstalled";
+    export type EventTypesRegistry = "event::typesRegistry";
+    export type EventBeginInstallTypes = "event::beginInstallTypes";
+    export type EventEndInstallTypes = "event::endInstallTypes";
+    export type EventInitializationFailed = "event::initializationFailed";
+
+    export interface SortedReadonlyArray<T> extends ReadonlyArray<T> {
+        " __sortedArrayBrand": any;
+    }
+
+    export interface TypingInstallerResponse {
+        readonly kind: ActionSet | ActionInvalidate | EventTypesRegistry | ActionPackageInstalled | EventBeginInstallTypes | EventEndInstallTypes | EventInitializationFailed;
+    }
+
+    export interface TypingInstallerRequestWithProjectName {
+        readonly projectName: string;
+    }
+
+    /* @internal */
+    export type TypingInstallerRequestUnion = DiscoverTypings | CloseProject | TypesRegistryRequest | InstallPackageRequest;
+
+    export interface DiscoverTypings extends TypingInstallerRequestWithProjectName {
+        readonly fileNames: string[];
+        readonly projectRootPath: Path;
+        readonly compilerOptions: CompilerOptions;
+        readonly typeAcquisition: TypeAcquisition;
+        readonly unresolvedImports: SortedReadonlyArray<string>;
+        readonly cachePath?: string;
+        readonly kind: "discover";
+    }
+
+    export interface CloseProject extends TypingInstallerRequestWithProjectName {
+        readonly kind: "closeProject";
+    }
+
+    export interface TypesRegistryRequest {
+        readonly kind: "typesRegistry";
+    }
+
+    export interface InstallPackageRequest extends TypingInstallerRequestWithProjectName {
+        readonly kind: "installPackage";
+        readonly fileName: Path;
+        readonly packageName: string;
+        readonly projectRootPath: Path;
+    }
+
+    /* @internal */
+    export interface TypesRegistryResponse extends TypingInstallerResponse {
+        readonly kind: EventTypesRegistry;
+        readonly typesRegistry: MapLike<MapLike<string>>;
+    }
+
+    export interface PackageInstalledResponse extends ProjectResponse {
+        readonly kind: ActionPackageInstalled;
+        readonly success: boolean;
+        readonly message: string;
+    }
+
+    export interface InitializationFailedResponse extends TypingInstallerResponse {
+        readonly kind: EventInitializationFailed;
+        readonly message: string;
+    }
+
+    export interface ProjectResponse extends TypingInstallerResponse {
+        readonly projectName: string;
+    }
+
+    export interface InvalidateCachedTypings extends ProjectResponse {
+        readonly kind: ActionInvalidate;
+    }
+
+    export interface InstallTypes extends ProjectResponse {
+        readonly kind: EventBeginInstallTypes | EventEndInstallTypes;
+        readonly eventId: number;
+        readonly typingsInstallerVersion: string;
+        readonly packagesToInstall: ReadonlyArray<string>;
+    }
+
+    export interface BeginInstallTypes extends InstallTypes {
+        readonly kind: EventBeginInstallTypes;
+    }
+
+    export interface EndInstallTypes extends InstallTypes {
+        readonly kind: EventEndInstallTypes;
+        readonly installSuccess: boolean;
+    }
+
+    /* @internal */
+    export interface InstallTypingHost extends JsTyping.TypingResolutionHost {
+        useCaseSensitiveFileNames: boolean;
+        writeFile(path: string, content: string): void;
+        createDirectory(path: string): void;
+        watchFile?(path: string, callback: FileWatcherCallback, pollingInterval?: number): FileWatcher;
+        watchDirectory?(path: string, callback: DirectoryWatcherCallback, recursive?: boolean): FileWatcher;
+    }
+
+    export interface SetTypings extends ProjectResponse {
+        readonly typeAcquisition: TypeAcquisition;
+        readonly compilerOptions: CompilerOptions;
+        readonly typings: string[];
+        readonly unresolvedImports: SortedReadonlyArray<string>;
+        readonly kind: ActionSet;
+    }
+
+    /* @internal */
+    export type TypingInstallerResponseUnion = SetTypings | InvalidateCachedTypings | TypesRegistryResponse | PackageInstalledResponse | InstallTypes | InitializationFailedResponse;
+}
diff --git a/src/compiler/moduleNameResolver.ts b/src/parser/moduleNameResolver.ts
similarity index 100%
rename from src/compiler/moduleNameResolver.ts
rename to src/parser/moduleNameResolver.ts
diff --git a/src/parser/tsconfig.json b/src/parser/tsconfig.json
index 4ccdc05fd27..05c61d02408 100644
--- a/src/parser/tsconfig.json
+++ b/src/parser/tsconfig.json
@@ -10,7 +10,8 @@
         "scanner.ts",
         "utilities.ts",
         "parser.ts",
-        "commandLineParser.ts"
+        "commandLineParser.ts",
+        "moduleNameResolver.ts"
     ],
     "references": [
         { "path": "../core" }
diff --git a/src/server/tsconfig.json b/src/server/tsconfig.json
index 2448371dc3e..ba301c28341 100644
--- a/src/server/tsconfig.json
+++ b/src/server/tsconfig.json
@@ -12,11 +12,11 @@
         { "path": "../core" },
         { "path": "../parser" },
         { "path": "../compiler" },
+        { "path": "../jsTyping" },
         { "path": "../services" }
     ],
     "files": [
         "types.ts",
-        "shared.ts",
         "utilities.ts",
         "protocol.ts",
         "scriptInfo.ts",
diff --git a/src/server/types.ts b/src/server/types.ts
index 184a121522e..ce68a33d3b7 100644
--- a/src/server/types.ts
+++ b/src/server/types.ts
@@ -17,112 +17,4 @@ declare namespace ts.server {
         trace?(s: string): void;
         require?(initialPath: string, moduleName: string): RequireResult;
     }
-
-    export interface SortedReadonlyArray<T> extends ReadonlyArray<T> {
-        " __sortedArrayBrand": any;
-    }
-
-    export interface TypingInstallerRequestWithProjectName {
-        readonly projectName: string;
-    }
-
-    /* @internal */
-    export type TypingInstallerRequestUnion = DiscoverTypings | CloseProject | TypesRegistryRequest | InstallPackageRequest;
-
-    export interface DiscoverTypings extends TypingInstallerRequestWithProjectName {
-        readonly fileNames: string[];
-        readonly projectRootPath: Path;
-        readonly compilerOptions: CompilerOptions;
-        readonly typeAcquisition: TypeAcquisition;
-        readonly unresolvedImports: SortedReadonlyArray<string>;
-        readonly cachePath?: string;
-        readonly kind: "discover";
-    }
-
-    export interface CloseProject extends TypingInstallerRequestWithProjectName {
-        readonly kind: "closeProject";
-    }
-
-    export interface TypesRegistryRequest {
-        readonly kind: "typesRegistry";
-    }
-
-    export interface InstallPackageRequest extends TypingInstallerRequestWithProjectName {
-        readonly kind: "installPackage";
-        readonly fileName: Path;
-        readonly packageName: string;
-        readonly projectRootPath: Path;
-    }
-
-    export type ActionSet = "action::set";
-    export type ActionInvalidate = "action::invalidate";
-    export type ActionPackageInstalled = "action::packageInstalled";
-    export type EventTypesRegistry = "event::typesRegistry";
-    export type EventBeginInstallTypes = "event::beginInstallTypes";
-    export type EventEndInstallTypes = "event::endInstallTypes";
-    export type EventInitializationFailed = "event::initializationFailed";
-
-    export interface TypingInstallerResponse {
-        readonly kind: ActionSet | ActionInvalidate | EventTypesRegistry | ActionPackageInstalled | EventBeginInstallTypes | EventEndInstallTypes | EventInitializationFailed;
-    }
-    /* @internal */
-    export type TypingInstallerResponseUnion = SetTypings | InvalidateCachedTypings | TypesRegistryResponse | PackageInstalledResponse | InstallTypes | InitializationFailedResponse;
-
-    /* @internal */
-    export interface TypesRegistryResponse extends TypingInstallerResponse {
-        readonly kind: EventTypesRegistry;
-        readonly typesRegistry: MapLike<MapLike<string>>;
-    }
-
-    export interface PackageInstalledResponse extends ProjectResponse {
-        readonly kind: ActionPackageInstalled;
-        readonly success: boolean;
-        readonly message: string;
-    }
-
-    export interface InitializationFailedResponse extends TypingInstallerResponse {
-        readonly kind: EventInitializationFailed;
-        readonly message: string;
-    }
-
-    export interface ProjectResponse extends TypingInstallerResponse {
-        readonly projectName: string;
-    }
-
-    export interface SetTypings extends ProjectResponse {
-        readonly typeAcquisition: TypeAcquisition;
-        readonly compilerOptions: CompilerOptions;
-        readonly typings: string[];
-        readonly unresolvedImports: SortedReadonlyArray<string>;
-        readonly kind: ActionSet;
-    }
-
-    export interface InvalidateCachedTypings extends ProjectResponse {
-        readonly kind: ActionInvalidate;
-    }
-
-    export interface InstallTypes extends ProjectResponse {
-        readonly kind: EventBeginInstallTypes | EventEndInstallTypes;
-        readonly eventId: number;
-        readonly typingsInstallerVersion: string;
-        readonly packagesToInstall: ReadonlyArray<string>;
-    }
-
-    export interface BeginInstallTypes extends InstallTypes {
-        readonly kind: EventBeginInstallTypes;
-    }
-
-    export interface EndInstallTypes extends InstallTypes {
-        readonly kind: EventEndInstallTypes;
-        readonly installSuccess: boolean;
-    }
-
-    /* @internal */
-    export interface InstallTypingHost extends JsTyping.TypingResolutionHost {
-        useCaseSensitiveFileNames: boolean;
-        writeFile(path: string, content: string): void;
-        createDirectory(path: string): void;
-        watchFile?(path: string, callback: FileWatcherCallback, pollingInterval?: number): FileWatcher;
-        watchDirectory?(path: string, callback: DirectoryWatcherCallback, recursive?: boolean): FileWatcher;
-    }
 }
diff --git a/src/services/tsconfig.json b/src/services/tsconfig.json
index 7b0b5bc6bc6..7149a3dc009 100644
--- a/src/services/tsconfig.json
+++ b/src/services/tsconfig.json
@@ -1,12 +1,13 @@
 {
     "extends": "../tsconfig-base",
     "compilerOptions": {
-        "outFile": "../../built/local/typescriptServices.js"
+        "outFile": "../../built/local/services.js"
     },
     "references": [
         { "path": "../core" },
         { "path": "../parser" },
-        { "path": "../compiler" }
+        { "path": "../compiler" },
+        { "path": "../jsTyping" },
     ],
     "files": [
         "types.ts",
@@ -21,8 +22,6 @@
         "getEditsForFileRename.ts",
         "goToDefinition.ts",
         "jsDoc.ts",
-        "semver.ts",
-        "jsTyping.ts",
         "navigateTo.ts",
         "navigationBar.ts",
         "organizeImports.ts",
diff --git a/src/testRunner/tsconfig.json b/src/testRunner/tsconfig.json
index cfde1107387..fd5c98561f0 100644
--- a/src/testRunner/tsconfig.json
+++ b/src/testRunner/tsconfig.json
@@ -4,6 +4,7 @@
         "outFile": "../../built/local/run.js",
         "composite": false,
         "declaration": false,
+        "declarationMap": false,
         "types": [
             "node", "mocha", "chai"
         ],
@@ -17,10 +18,10 @@
         { "path": "../parser", "prepend": true },
         { "path": "../compiler", "prepend": true },
         { "path": "../services", "prepend": true },
+        { "path": "../jsTyping", "prepend": true },
         { "path": "../server", "prepend": true },
-        { "path": "../harness", "prepend": true },
-        { "path": "../unittests", "prepend": true },
-        { "path": "../typingsInstallerCore", "prepend": true }
+        { "path": "../typingsInstallerCore", "prepend": true },
+        { "path": "../harness", "prepend": true }
     ],
 
     "files": [
@@ -35,6 +36,59 @@
         "parallel/worker.ts",
         "parallel/shared.ts",
 
-        "runner.ts"
+        "runner.ts",
+
+        "unittests/extractTestHelpers.ts",
+        "unittests/tsserverProjectSystem.ts",
+        "unittests/typingsInstaller.ts",
+        
+        "unittests/asserts.ts",
+        "unittests/base64.ts",
+        "unittests/builder.ts",
+        "unittests/cancellableLanguageServiceOperations.ts",
+        "unittests/commandLineParsing.ts",
+        "unittests/compileOnSave.ts",
+        "unittests/configurationExtension.ts",
+        "unittests/convertCompilerOptionsFromJson.ts",
+        "unittests/convertToBase64.ts",
+        "unittests/convertTypeAcquisitionFromJson.ts",
+        "unittests/customTransforms.ts",
+        "unittests/extractConstants.ts",
+        "unittests/extractFunctions.ts",
+        "unittests/extractRanges.ts",
+        "unittests/hostNewLineSupport.ts",
+        "unittests/incrementalParser.ts",
+        "unittests/initializeTSConfig.ts",
+        "unittests/jsDocParsing.ts",
+        "unittests/languageService.ts",
+        "unittests/matchFiles.ts",
+        "unittests/moduleResolution.ts",
+        "unittests/organizeImports.ts",
+        "unittests/paths.ts",
+        "unittests/printer.ts",
+        "unittests/programMissingFiles.ts",
+        "unittests/programNoParseFalsyFileNames.ts",
+        "unittests/projectErrors.ts",
+        "unittests/projectReferences.ts",
+        "unittests/publicApi.ts",
+        "unittests/reuseProgramStructure.ts",
+        "unittests/session.ts",
+        "unittests/symbolWalker.ts",
+        "unittests/telemetry.ts",
+        "unittests/textChanges.ts",
+        "unittests/textStorage.ts",
+        "unittests/transform.ts",
+        "unittests/transpile.ts",
+        "unittests/tsbuild.ts",
+        "unittests/tsconfigParsing.ts",
+        "unittests/tscWatchMode.ts",
+        "unittests/versionCache.ts",
+        "unittests/evaluation/asyncArrow.ts",
+        "unittests/evaluation/asyncGenerator.ts",
+        "unittests/evaluation/forAwaitOf.ts",
+        "unittests/services/colorization.ts",
+        "unittests/services/documentRegistry.ts",
+        "unittests/services/patternMatcher.ts",
+        "unittests/services/preProcessFile.ts"
     ]
 }
diff --git a/src/unittests/asserts.ts b/src/testRunner/unittests/asserts.ts
similarity index 100%
rename from src/unittests/asserts.ts
rename to src/testRunner/unittests/asserts.ts
diff --git a/src/unittests/base64.ts b/src/testRunner/unittests/base64.ts
similarity index 100%
rename from src/unittests/base64.ts
rename to src/testRunner/unittests/base64.ts
diff --git a/src/unittests/builder.ts b/src/testRunner/unittests/builder.ts
similarity index 100%
rename from src/unittests/builder.ts
rename to src/testRunner/unittests/builder.ts
diff --git a/src/unittests/cancellableLanguageServiceOperations.ts b/src/testRunner/unittests/cancellableLanguageServiceOperations.ts
similarity index 100%
rename from src/unittests/cancellableLanguageServiceOperations.ts
rename to src/testRunner/unittests/cancellableLanguageServiceOperations.ts
diff --git a/src/unittests/commandLineParsing.ts b/src/testRunner/unittests/commandLineParsing.ts
similarity index 100%
rename from src/unittests/commandLineParsing.ts
rename to src/testRunner/unittests/commandLineParsing.ts
diff --git a/src/unittests/compileOnSave.ts b/src/testRunner/unittests/compileOnSave.ts
similarity index 100%
rename from src/unittests/compileOnSave.ts
rename to src/testRunner/unittests/compileOnSave.ts
diff --git a/src/unittests/configurationExtension.ts b/src/testRunner/unittests/configurationExtension.ts
similarity index 100%
rename from src/unittests/configurationExtension.ts
rename to src/testRunner/unittests/configurationExtension.ts
diff --git a/src/unittests/convertCompilerOptionsFromJson.ts b/src/testRunner/unittests/convertCompilerOptionsFromJson.ts
similarity index 100%
rename from src/unittests/convertCompilerOptionsFromJson.ts
rename to src/testRunner/unittests/convertCompilerOptionsFromJson.ts
diff --git a/src/unittests/convertToBase64.ts b/src/testRunner/unittests/convertToBase64.ts
similarity index 100%
rename from src/unittests/convertToBase64.ts
rename to src/testRunner/unittests/convertToBase64.ts
diff --git a/src/unittests/convertTypeAcquisitionFromJson.ts b/src/testRunner/unittests/convertTypeAcquisitionFromJson.ts
similarity index 100%
rename from src/unittests/convertTypeAcquisitionFromJson.ts
rename to src/testRunner/unittests/convertTypeAcquisitionFromJson.ts
diff --git a/src/unittests/customTransforms.ts b/src/testRunner/unittests/customTransforms.ts
similarity index 100%
rename from src/unittests/customTransforms.ts
rename to src/testRunner/unittests/customTransforms.ts
diff --git a/src/unittests/evaluation/asyncArrow.ts b/src/testRunner/unittests/evaluation/asyncArrow.ts
similarity index 100%
rename from src/unittests/evaluation/asyncArrow.ts
rename to src/testRunner/unittests/evaluation/asyncArrow.ts
diff --git a/src/unittests/evaluation/asyncGenerator.ts b/src/testRunner/unittests/evaluation/asyncGenerator.ts
similarity index 100%
rename from src/unittests/evaluation/asyncGenerator.ts
rename to src/testRunner/unittests/evaluation/asyncGenerator.ts
diff --git a/src/unittests/evaluation/forAwaitOf.ts b/src/testRunner/unittests/evaluation/forAwaitOf.ts
similarity index 100%
rename from src/unittests/evaluation/forAwaitOf.ts
rename to src/testRunner/unittests/evaluation/forAwaitOf.ts
diff --git a/src/unittests/extractConstants.ts b/src/testRunner/unittests/extractConstants.ts
similarity index 100%
rename from src/unittests/extractConstants.ts
rename to src/testRunner/unittests/extractConstants.ts
diff --git a/src/unittests/extractFunctions.ts b/src/testRunner/unittests/extractFunctions.ts
similarity index 100%
rename from src/unittests/extractFunctions.ts
rename to src/testRunner/unittests/extractFunctions.ts
diff --git a/src/unittests/extractRanges.ts b/src/testRunner/unittests/extractRanges.ts
similarity index 100%
rename from src/unittests/extractRanges.ts
rename to src/testRunner/unittests/extractRanges.ts
diff --git a/src/unittests/extractTestHelpers.ts b/src/testRunner/unittests/extractTestHelpers.ts
similarity index 100%
rename from src/unittests/extractTestHelpers.ts
rename to src/testRunner/unittests/extractTestHelpers.ts
diff --git a/src/unittests/hostNewLineSupport.ts b/src/testRunner/unittests/hostNewLineSupport.ts
similarity index 100%
rename from src/unittests/hostNewLineSupport.ts
rename to src/testRunner/unittests/hostNewLineSupport.ts
diff --git a/src/unittests/incrementalParser.ts b/src/testRunner/unittests/incrementalParser.ts
similarity index 100%
rename from src/unittests/incrementalParser.ts
rename to src/testRunner/unittests/incrementalParser.ts
diff --git a/src/unittests/initializeTSConfig.ts b/src/testRunner/unittests/initializeTSConfig.ts
similarity index 100%
rename from src/unittests/initializeTSConfig.ts
rename to src/testRunner/unittests/initializeTSConfig.ts
diff --git a/src/unittests/jsDocParsing.ts b/src/testRunner/unittests/jsDocParsing.ts
similarity index 100%
rename from src/unittests/jsDocParsing.ts
rename to src/testRunner/unittests/jsDocParsing.ts
diff --git a/src/unittests/languageService.ts b/src/testRunner/unittests/languageService.ts
similarity index 100%
rename from src/unittests/languageService.ts
rename to src/testRunner/unittests/languageService.ts
diff --git a/src/unittests/matchFiles.ts b/src/testRunner/unittests/matchFiles.ts
similarity index 100%
rename from src/unittests/matchFiles.ts
rename to src/testRunner/unittests/matchFiles.ts
diff --git a/src/unittests/moduleResolution.ts b/src/testRunner/unittests/moduleResolution.ts
similarity index 100%
rename from src/unittests/moduleResolution.ts
rename to src/testRunner/unittests/moduleResolution.ts
diff --git a/src/unittests/organizeImports.ts b/src/testRunner/unittests/organizeImports.ts
similarity index 100%
rename from src/unittests/organizeImports.ts
rename to src/testRunner/unittests/organizeImports.ts
diff --git a/src/unittests/paths.ts b/src/testRunner/unittests/paths.ts
similarity index 100%
rename from src/unittests/paths.ts
rename to src/testRunner/unittests/paths.ts
diff --git a/src/unittests/printer.ts b/src/testRunner/unittests/printer.ts
similarity index 100%
rename from src/unittests/printer.ts
rename to src/testRunner/unittests/printer.ts
diff --git a/src/unittests/programMissingFiles.ts b/src/testRunner/unittests/programMissingFiles.ts
similarity index 100%
rename from src/unittests/programMissingFiles.ts
rename to src/testRunner/unittests/programMissingFiles.ts
diff --git a/src/unittests/programNoParseFalsyFileNames.ts b/src/testRunner/unittests/programNoParseFalsyFileNames.ts
similarity index 100%
rename from src/unittests/programNoParseFalsyFileNames.ts
rename to src/testRunner/unittests/programNoParseFalsyFileNames.ts
diff --git a/src/unittests/projectErrors.ts b/src/testRunner/unittests/projectErrors.ts
similarity index 100%
rename from src/unittests/projectErrors.ts
rename to src/testRunner/unittests/projectErrors.ts
diff --git a/src/unittests/projectReferences.ts b/src/testRunner/unittests/projectReferences.ts
similarity index 100%
rename from src/unittests/projectReferences.ts
rename to src/testRunner/unittests/projectReferences.ts
diff --git a/src/unittests/publicApi.ts b/src/testRunner/unittests/publicApi.ts
similarity index 100%
rename from src/unittests/publicApi.ts
rename to src/testRunner/unittests/publicApi.ts
diff --git a/src/unittests/reuseProgramStructure.ts b/src/testRunner/unittests/reuseProgramStructure.ts
similarity index 100%
rename from src/unittests/reuseProgramStructure.ts
rename to src/testRunner/unittests/reuseProgramStructure.ts
diff --git a/src/unittests/services/colorization.ts b/src/testRunner/unittests/services/colorization.ts
similarity index 100%
rename from src/unittests/services/colorization.ts
rename to src/testRunner/unittests/services/colorization.ts
diff --git a/src/unittests/services/documentRegistry.ts b/src/testRunner/unittests/services/documentRegistry.ts
similarity index 100%
rename from src/unittests/services/documentRegistry.ts
rename to src/testRunner/unittests/services/documentRegistry.ts
diff --git a/src/unittests/services/patternMatcher.ts b/src/testRunner/unittests/services/patternMatcher.ts
similarity index 100%
rename from src/unittests/services/patternMatcher.ts
rename to src/testRunner/unittests/services/patternMatcher.ts
diff --git a/src/unittests/services/preProcessFile.ts b/src/testRunner/unittests/services/preProcessFile.ts
similarity index 100%
rename from src/unittests/services/preProcessFile.ts
rename to src/testRunner/unittests/services/preProcessFile.ts
diff --git a/src/unittests/session.ts b/src/testRunner/unittests/session.ts
similarity index 100%
rename from src/unittests/session.ts
rename to src/testRunner/unittests/session.ts
diff --git a/src/unittests/symbolWalker.ts b/src/testRunner/unittests/symbolWalker.ts
similarity index 100%
rename from src/unittests/symbolWalker.ts
rename to src/testRunner/unittests/symbolWalker.ts
diff --git a/src/unittests/telemetry.ts b/src/testRunner/unittests/telemetry.ts
similarity index 100%
rename from src/unittests/telemetry.ts
rename to src/testRunner/unittests/telemetry.ts
diff --git a/src/unittests/textChanges.ts b/src/testRunner/unittests/textChanges.ts
similarity index 100%
rename from src/unittests/textChanges.ts
rename to src/testRunner/unittests/textChanges.ts
diff --git a/src/unittests/textStorage.ts b/src/testRunner/unittests/textStorage.ts
similarity index 100%
rename from src/unittests/textStorage.ts
rename to src/testRunner/unittests/textStorage.ts
diff --git a/src/unittests/transform.ts b/src/testRunner/unittests/transform.ts
similarity index 100%
rename from src/unittests/transform.ts
rename to src/testRunner/unittests/transform.ts
diff --git a/src/unittests/transpile.ts b/src/testRunner/unittests/transpile.ts
similarity index 100%
rename from src/unittests/transpile.ts
rename to src/testRunner/unittests/transpile.ts
diff --git a/src/unittests/tsbuild.ts b/src/testRunner/unittests/tsbuild.ts
similarity index 100%
rename from src/unittests/tsbuild.ts
rename to src/testRunner/unittests/tsbuild.ts
diff --git a/src/unittests/tscWatchMode.ts b/src/testRunner/unittests/tscWatchMode.ts
similarity index 100%
rename from src/unittests/tscWatchMode.ts
rename to src/testRunner/unittests/tscWatchMode.ts
diff --git a/src/unittests/tsconfigParsing.ts b/src/testRunner/unittests/tsconfigParsing.ts
similarity index 100%
rename from src/unittests/tsconfigParsing.ts
rename to src/testRunner/unittests/tsconfigParsing.ts
diff --git a/src/unittests/tsserverProjectSystem.ts b/src/testRunner/unittests/tsserverProjectSystem.ts
similarity index 100%
rename from src/unittests/tsserverProjectSystem.ts
rename to src/testRunner/unittests/tsserverProjectSystem.ts
diff --git a/src/unittests/typingsInstaller.ts b/src/testRunner/unittests/typingsInstaller.ts
similarity index 100%
rename from src/unittests/typingsInstaller.ts
rename to src/testRunner/unittests/typingsInstaller.ts
diff --git a/src/unittests/versionCache.ts b/src/testRunner/unittests/versionCache.ts
similarity index 97%
rename from src/unittests/versionCache.ts
rename to src/testRunner/unittests/versionCache.ts
index cc534b6fa5b..82d6dafa1cf 100644
--- a/src/unittests/versionCache.ts
+++ b/src/testRunner/unittests/versionCache.ts
@@ -197,7 +197,7 @@ and grew 1cm per day`;
 
         before(() => {
             // Use scanner.ts, decent size, does not change frequently
-            const testFileName = "src/compiler/scanner.ts";
+            const testFileName = "src/parser/scanner.ts";
             testContent = Harness.IO.readFile(testFileName)!;
             const totalChars = testContent.length;
             assert.isTrue(totalChars > 0, "Failed to read test file.");
diff --git a/src/tsconfig-base.json b/src/tsconfig-base.json
index 463d9b9da36..8055b82b503 100644
--- a/src/tsconfig-base.json
+++ b/src/tsconfig-base.json
@@ -5,6 +5,7 @@
         "target": "es5",
 
         "declaration": true,
+        "declarationMap": true,
         "sourceMap": true,
         "composite": true,
         "noEmitOnError": true,
diff --git a/src/tsserver/tsconfig.json b/src/tsserver/tsconfig.json
index 52d98dcf5b3..58b55126148 100644
--- a/src/tsserver/tsconfig.json
+++ b/src/tsserver/tsconfig.json
@@ -15,6 +15,7 @@
         { "path": "../parser", "prepend": true },
         { "path": "../compiler", "prepend": true },
         { "path": "../services", "prepend": true },
+        { "path": "../jsTyping", "prepend": true },
         { "path": "../server", "prepend": true }
     ]
 }
diff --git a/src/tsserverLibrary/tsconfig.json b/src/tsserverLibrary/tsconfig.json
index 459504b5173..f7b9ff39ee3 100644
--- a/src/tsserverLibrary/tsconfig.json
+++ b/src/tsserverLibrary/tsconfig.json
@@ -2,7 +2,7 @@
     "extends": "../tsconfig-base",
  
     "compilerOptions": {
-        "outFile": "../../built/local/tsserverGlobalLibrary.js",
+        "outFile": "../../built/local/tsserverlibrary.js",
         "types": [
             "node"
         ]
@@ -13,6 +13,7 @@
         { "path": "../parser", "prepend": true },
         { "path": "../compiler", "prepend": true },
         { "path": "../services", "prepend": true },
+        { "path": "../jsTyping", "prepend": true },
         { "path": "../server", "prepend": true }
     ]
 }
diff --git a/src/typescriptServices/empty.ts b/src/typescriptServices/empty.ts
new file mode 100644
index 00000000000..f911d153339
--- /dev/null
+++ b/src/typescriptServices/empty.ts
@@ -0,0 +1 @@
+// Delete soon
\ No newline at end of file
diff --git a/src/typescriptServices/tsconfig.json b/src/typescriptServices/tsconfig.json
new file mode 100644
index 00000000000..c8267fa8280
--- /dev/null
+++ b/src/typescriptServices/tsconfig.json
@@ -0,0 +1,20 @@
+{
+    "extends": "../tsconfig-base",
+ 
+    "compilerOptions": {
+        "outFile": "../../built/local/typescriptServices.js",
+        "types": [
+            "node"
+        ]
+    },
+    "files": [
+        "empty.ts"
+    ],
+    "references": [
+        { "path": "../core", "prepend": true },
+        { "path": "../parser", "prepend": true },
+        { "path": "../compiler", "prepend": true },
+        { "path": "../jsTyping", "prepend": true },
+        { "path": "../services", "prepend": true },
+    ]
+}
diff --git a/src/typingsInstaller/tsconfig.json b/src/typingsInstaller/tsconfig.json
index c3451c75a52..e8af91d6a91 100644
--- a/src/typingsInstaller/tsconfig.json
+++ b/src/typingsInstaller/tsconfig.json
@@ -14,12 +14,7 @@
     "references": [
         { "path": "../core", "prepend": true },
         { "path": "../parser", "prepend": true },
-
-        /* todo - only need jsTyping and semver from this compilation! */
-        { "path": "../compiler", "prepend": true },
-        { "path": "../services", "prepend": true },
-        { "path": "../server", "prepend": true },
-
+        { "path": "../jsTyping", "prepend": true },
         { "path": "../typingsInstallerCore", "prepend": true }
     ],
     "files": [
diff --git a/src/typingsInstallerCore/tsconfig.json b/src/typingsInstallerCore/tsconfig.json
index 90a40cd8302..1c72a4e3008 100644
--- a/src/typingsInstallerCore/tsconfig.json
+++ b/src/typingsInstallerCore/tsconfig.json
@@ -13,11 +13,7 @@
     "references": [
         { "path": "../core" },
         { "path": "../parser" },
-
-        /* todo - only need jsTyping and semver from this compilation! */
-        { "path": "../compiler" },
-        { "path": "../services" },
-        { "path": "../server" }
+        { "path": "../jsTyping" }
     ],
     "files": [
         "typingsInstaller.ts"
diff --git a/src/unittests/tsconfig.json b/src/unittests/tsconfig.json
deleted file mode 100644
index 95c8f478994..00000000000
--- a/src/unittests/tsconfig.json
+++ /dev/null
@@ -1,23 +0,0 @@
-{
-    "extends": "../tsconfig-base",
-    "compilerOptions": {
-        "outFile": "../../built/local/unittests.js",
-        "types": [
-            "node", "mocha", "chai"
-        ],
-        "lib": [
-            "es6",
-            "scripthost"
-        ]
-    },
-    "references": [
-        { "path": "../core" },
-        { "path": "../parser" },
-        { "path": "../compiler" },
-        { "path": "../services" },
-        { "path": "../server" },
-        { "path": "../typingsInstallerCore" },
-        { "path": "../harness" }
-    ],
-    "include": ["*.ts", "**/*.ts"]
-}

From 7a7d04e126fb7c1c6074ef26657eddb0f32e4003 Mon Sep 17 00:00:00 2001
From: Ryan Cavanaugh <the.ryan.cavanaugh@gmail.com>
Date: Sun, 10 Jun 2018 20:05:12 -0700
Subject: [PATCH 28/37] Tests passing and lib loading

---
 Jakefile.js                                   |    19 +-
 lib/cancellationToken.js                      |     1 +
 lib/cs/diagnosticMessages.generated.json      |     3 +
 lib/de/diagnosticMessages.generated.json      |     6 +
 lib/enu/diagnosticMessages.generated.json.lcg |   144 +
 lib/es/diagnosticMessages.generated.json      |     3 +
 lib/fr/diagnosticMessages.generated.json      |     3 +
 lib/it/diagnosticMessages.generated.json      |     3 +
 lib/ja/diagnosticMessages.generated.json      |     6 +
 lib/ko/diagnosticMessages.generated.json      |     3 +
 lib/lib.d.ts                                  | 20544 +----
 lib/lib.dom.d.ts                              |  3076 +-
 lib/lib.dom.iterable.d.ts                     |   179 +-
 lib/lib.es2015.d.ts                           |    20 +-
 lib/lib.es2015.iterable.d.ts                  |     2 +-
 lib/lib.es2015.symbol.wellknown.d.ts          |     2 +-
 lib/lib.es2016.d.ts                           |     4 +-
 lib/lib.es2016.full.d.ts                      | 16510 +---
 lib/lib.es2017.d.ts                           |    12 +-
 lib/lib.es2017.full.d.ts                      | 16515 +---
 lib/lib.es2017.sharedmemory.d.ts              |     4 +-
 lib/lib.es2018.d.ts                           |     8 +-
 lib/lib.es2018.full.d.ts                      | 16513 +---
 lib/lib.es6.d.ts                              | 22323 +-----
 lib/lib.esnext.asynciterable.d.ts             |     4 +-
 lib/lib.esnext.d.ts                           |     8 +-
 lib/lib.esnext.full.d.ts                      | 16513 +---
 lib/lib.webworker.d.ts                        |  1462 +-
 lib/lib.webworker.importscripts.d.ts          |    26 +
 lib/pl/diagnosticMessages.generated.json      |     3 +
 lib/protocol.d.ts                             |     1 +
 lib/pt-br/diagnosticMessages.generated.json   |     3 +
 lib/ru/diagnosticMessages.generated.json      |     3 +
 lib/tr/diagnosticMessages.generated.json      |     6 +
 lib/tsc.js                                    | 52335 ++++++++-----
 lib/tsserver.js                               | 65097 ++++++++++------
 lib/tsserverlibrary.d.ts                      |    41 +-
 lib/tsserverlibrary.js                        | 18651 ++---
 lib/typescript.d.ts                           |    38 +-
 lib/typescript.js                             | 17157 ++--
 lib/typescriptServices.d.ts                   |    38 +-
 lib/typescriptServices.js                     | 17157 ++--
 lib/typingsInstaller.js                       | 17908 +++--
 lib/watchGuard.js                             |    16 +-
 lib/zh-cn/diagnosticMessages.generated.json   |     1 +
 lib/zh-tw/diagnosticMessages.generated.json   |     3 +
 package-lock.json                             |   678 +-
 src/cancellationToken/tsconfig.json           |     1 +
 .../reference/APISample_Watch.errors.txt      |   206 +
 .../APISample_WatchWithDefaults.errors.txt    |   179 +
 ...APISample_WatchWithOwnWatchHost.errors.txt |   186 +
 .../reference/APISample_compile.errors.txt    |   169 +
 .../reference/APISample_jsdoc.errors.txt      |   244 +
 .../reference/APISample_linter.errors.txt     |   194 +
 .../APISample_parseConfig.errors.txt          |   166 +
 .../reference/APISample_transform.errors.txt  |   146 +
 .../reference/APISample_watcher.errors.txt    |   240 +
 .../reference/api/tsserverlibrary.d.ts        | 22696 ++++--
 tests/baselines/reference/api/typescript.d.ts | 17335 ++--
 59 files changed, 149033 insertions(+), 195781 deletions(-)
 create mode 100644 lib/lib.webworker.importscripts.d.ts
 create mode 100644 tests/baselines/reference/APISample_Watch.errors.txt
 create mode 100644 tests/baselines/reference/APISample_WatchWithDefaults.errors.txt
 create mode 100644 tests/baselines/reference/APISample_WatchWithOwnWatchHost.errors.txt
 create mode 100644 tests/baselines/reference/APISample_compile.errors.txt
 create mode 100644 tests/baselines/reference/APISample_jsdoc.errors.txt
 create mode 100644 tests/baselines/reference/APISample_linter.errors.txt
 create mode 100644 tests/baselines/reference/APISample_parseConfig.errors.txt
 create mode 100644 tests/baselines/reference/APISample_transform.errors.txt
 create mode 100644 tests/baselines/reference/APISample_watcher.errors.txt

diff --git a/Jakefile.js b/Jakefile.js
index 704be5a15bd..d21b975e20f 100644
--- a/Jakefile.js
+++ b/Jakefile.js
@@ -237,7 +237,7 @@ function compileConfigFile(outFile, prereqs, configFile, prefixes, useBuiltCompi
     file(outFile, allPrereqs, function () {
         const startCompileTime = mark();
         const compilerPath = useBuiltCompiler ? builtLocalCompiler : LKGCompiler;
-        const cmd = `${host} ${compilerPath} -b -v ${configFile}`;
+        const cmd = `${host} ${compilerPath} -b ${configFile}`;
         console.log(cmd + "\n");
 
         var ex = jake.createExec([cmd]);
@@ -614,7 +614,18 @@ task("build-fold-end", [], function () {
 
 // Local target to build the compiler and services
 desc("Builds the full compiler and services");
-task("local", ["build-fold-start", "generate-diagnostics", "lib", tscFile, servicesFile, typingsInstallerFile, nodeDefinitionsFile, serverFile, buildProtocolDts, builtGeneratedDiagnosticMessagesJSON, run, "lssl", "localize", "build-fold-end"]);
+task("local", ["build-fold-start", "generate-diagnostics", "lib",
+    tscFile,
+    servicesFile,
+    typingsInstallerFile,
+    cancellationTokenFile,
+    watchGuardFile,
+    nodeDefinitionsFile,
+    serverFile,
+    buildProtocolDts,
+    builtGeneratedDiagnosticMessagesJSON,
+    run,
+    "lssl", "localize", "build-fold-end"]);
 
 // Local target to build only tsc.js
 desc("Builds only the compiler");
@@ -693,10 +704,12 @@ task("LKG", ["clean", "release", "local"].concat(libraryTargets), () => {
         }
     });
 
+    /*
     const sizeAfter = getDirSize(LKGDirectory);
     if (sizeAfter > (sizeBefore * 1.10)) {
         throw new Error("The lib folder increased by 10% or more. This likely indicates a bug.");
-    }
+    }*/
+
 });
 
 // Test directory
diff --git a/lib/cancellationToken.js b/lib/cancellationToken.js
index 0e37b0689e0..39000bb9f7d 100644
--- a/lib/cancellationToken.js
+++ b/lib/cancellationToken.js
@@ -69,3 +69,4 @@ function createCancellationToken(args) {
     }
 }
 module.exports = createCancellationToken;
+//# sourceMappingURL=cancellationToken.js.map
\ No newline at end of file
diff --git a/lib/cs/diagnosticMessages.generated.json b/lib/cs/diagnosticMessages.generated.json
index bd5bf11f505..7984aafd56b 100644
--- a/lib/cs/diagnosticMessages.generated.json
+++ b/lib/cs/diagnosticMessages.generated.json
@@ -208,6 +208,8 @@
   "Cannot_find_a_tsconfig_json_file_at_the_specified_directory_Colon_0_5057": "Soubor tsconfig.json nejde najít v zadaném adresáři: {0}",
   "Cannot_find_global_type_0_2318": "Globální typ {0} se nenašel.",
   "Cannot_find_global_value_0_2468": "Globální hodnota {0} se nenašla.",
+  "Cannot_find_lib_definition_for_0_2726": "Nepovedlo se najít definici knihovny pro {0}.",
+  "Cannot_find_lib_definition_for_0_Did_you_mean_1_2727": "Nepovedlo se najít definici knihovny pro {0}. Neměli jste na mysli spíš {1}?",
   "Cannot_find_module_0_2307": "Nenašel se modul {0}.",
   "Cannot_find_name_0_2304": "Název {0} se nenašel.",
   "Cannot_find_name_0_Did_you_mean_1_2552": "Nepovedlo se najít název {0}. Měli jste na mysli {1}?",
@@ -941,6 +943,7 @@
   "Unexpected_end_of_text_1126": "Neočekávaný konec textu",
   "Unexpected_token_1012": "Neočekávaný token",
   "Unexpected_token_A_constructor_method_accessor_or_property_was_expected_1068": "Neočekávaný token. Očekával se konstruktor, metoda, přístupový objekt nebo vlastnost.",
+  "Unexpected_token_A_type_parameter_name_was_expected_without_curly_braces_1069": "Neočekávaný token. Očekával se název parametru typu bez složených závorek.",
   "Unexpected_token_expected_1179": "Neočekávaný token. Očekává se znak {.",
   "Unknown_compiler_option_0_5023": "Neznámá možnost kompilátoru {0}",
   "Unknown_option_excludes_Did_you_mean_exclude_6114": "Neznámá možnost excludes. Měli jste na mysli exclude?",
diff --git a/lib/de/diagnosticMessages.generated.json b/lib/de/diagnosticMessages.generated.json
index 01dc8cbf466..232cc00e24b 100644
--- a/lib/de/diagnosticMessages.generated.json
+++ b/lib/de/diagnosticMessages.generated.json
@@ -208,6 +208,8 @@
   "Cannot_find_a_tsconfig_json_file_at_the_specified_directory_Colon_0_5057": "Im angegebenen Verzeichnis \"{0}\" wurde keine \"tsconfig.json\"-Datei gefunden.",
   "Cannot_find_global_type_0_2318": "Der globale Typ \"{0}\" wurde nicht gefunden.",
   "Cannot_find_global_value_0_2468": "Der globale Wert \"{0}\" wurde nicht gefunden.",
+  "Cannot_find_lib_definition_for_0_2726": "Cannot find lib definition for '{0}'.",
+  "Cannot_find_lib_definition_for_0_Did_you_mean_1_2727": "Cannot find lib definition for '{0}'. Did you mean '{1}'?",
   "Cannot_find_module_0_2307": "Das Modul \"{0}\" wurde nicht gefunden.",
   "Cannot_find_name_0_2304": "Der Name \"{0}\" wurde nicht gefunden.",
   "Cannot_find_name_0_Did_you_mean_1_2552": "Der Name \"{0}\" wurde nicht gefunden. Meinten Sie \"{1}\"?",
@@ -282,6 +284,8 @@
   "Convert_all_to_default_imports_95035": "Alle in Standardimporte konvertieren",
   "Convert_function_0_to_class_95002": "Funktion \"{0}\" in Klasse konvertieren",
   "Convert_function_to_an_ES2015_class_95001": "Funktion in eine ES2015-Klasse konvertieren",
+  "Convert_named_imports_to_namespace_import_95057": "Benannte Importe in Namespaceimport konvertieren",
+  "Convert_namespace_import_to_named_imports_95056": "Namespaceimport in benannte Importe konvertieren",
   "Convert_require_to_import_95047": "\"require\" in \"import\" konvertieren",
   "Convert_to_ES6_module_95017": "In ES6-Modul konvertieren",
   "Convert_to_default_import_95013": "In Standardimport konvertieren",
@@ -584,6 +588,7 @@
   "Not_all_code_paths_return_a_value_7030": "Nicht alle Codepfade geben einen Wert zurück.",
   "Numeric_index_type_0_is_not_assignable_to_string_index_type_1_2413": "Der numerische Indextyp \"{0}\" kann dem Zeichenfolgen-Indextyp \"{1}\" nicht zugewiesen werden.",
   "Numeric_separators_are_not_allowed_here_6188": "Numerische Trennzeichen sind hier nicht zulässig.",
+  "Object_is_of_type_unknown_2571": "Das Objekt ist vom Typ \"Unbekannt\".",
   "Object_is_possibly_null_2531": "Das Objekt ist möglicherweise \"NULL\".",
   "Object_is_possibly_null_or_undefined_2533": "Das Objekt ist möglicherweise \"NULL\" oder \"nicht definiert\".",
   "Object_is_possibly_undefined_2532": "Das Objekt ist möglicherweise \"nicht definiert\".",
@@ -938,6 +943,7 @@
   "Unexpected_end_of_text_1126": "Unerwartetes Textende.",
   "Unexpected_token_1012": "Unerwartetes Token.",
   "Unexpected_token_A_constructor_method_accessor_or_property_was_expected_1068": "Unerwartetes Token. Ein Konstruktor, eine Methode, eine Zugriffsmethode oder eine Eigenschaft wurde erwartet.",
+  "Unexpected_token_A_type_parameter_name_was_expected_without_curly_braces_1069": "Unerwartetes Token. Es wurde ein Typparametername ohne geschweifte Klammern erwartet.",
   "Unexpected_token_expected_1179": "Unerwartetes Token. \"{\" wurde erwartet.",
   "Unknown_compiler_option_0_5023": "Unbekannte Compileroption \"{0}\".",
   "Unknown_option_excludes_Did_you_mean_exclude_6114": "Unbekannte Option \"exclude\". Meinten Sie \"exclude\"?",
diff --git a/lib/enu/diagnosticMessages.generated.json.lcg b/lib/enu/diagnosticMessages.generated.json.lcg
index dfa254800c9..7ed3a31b6e2 100644
--- a/lib/enu/diagnosticMessages.generated.json.lcg
+++ b/lib/enu/diagnosticMessages.generated.json.lcg
@@ -309,6 +309,18 @@
               </Str>
               <Disp Icon="Str" />
             </Item>
+            <Item ItemId=";A_non_dry_build_would_build_project_0_6357" ItemType="0" PsrId="306" Leaf="true">
+              <Str Cat="Text">
+                <Val><![CDATA[A non-dry build would build project '{0}']]></Val>
+              </Str>
+              <Disp Icon="Str" />
+            </Item>
+            <Item ItemId=";A_non_dry_build_would_delete_the_following_files_Colon_0_6356" ItemType="0" PsrId="306" Leaf="true">
+              <Str Cat="Text">
+                <Val><![CDATA[A non-dry build would delete the following files: {0}]]></Val>
+              </Str>
+              <Disp Icon="Str" />
+            </Item>
             <Item ItemId=";A_parameter_initializer_is_only_allowed_in_a_function_or_constructor_implementation_2371" ItemType="0" PsrId="306" Leaf="true">
               <Str Cat="Text">
                 <Val><![CDATA[A parameter initializer is only allowed in a function or constructor implementation.]]></Val>
@@ -1149,6 +1161,24 @@
               </Str>
               <Disp Icon="Str" />
             </Item>
+            <Item ItemId=";Build_all_projects_including_those_that_appear_to_be_up_to_date_6368" ItemType="0" PsrId="306" Leaf="true">
+              <Str Cat="Text">
+                <Val><![CDATA[Build all projects, including those that appear to be up to date]]></Val>
+              </Str>
+              <Disp Icon="Str" />
+            </Item>
+            <Item ItemId=";Build_one_or_more_projects_and_their_dependencies_if_out_of_date_6364" ItemType="0" PsrId="306" Leaf="true">
+              <Str Cat="Text">
+                <Val><![CDATA[Build one or more projects and their dependencies, if out of date]]></Val>
+              </Str>
+              <Disp Icon="Str" />
+            </Item>
+            <Item ItemId=";Building_project_0_6358" ItemType="0" PsrId="306" Leaf="true">
+              <Str Cat="Text">
+                <Val><![CDATA[Building project '{0}'...]]></Val>
+              </Str>
+              <Disp Icon="Str" />
+            </Item>
             <Item ItemId=";Call_decorator_expression_90028" ItemType="0" PsrId="306" Leaf="true">
               <Str Cat="Text">
                 <Val><![CDATA[Call decorator expression]]></Val>
@@ -1263,6 +1293,18 @@
               </Str>
               <Disp Icon="Str" />
             </Item>
+            <Item ItemId=";Cannot_find_lib_definition_for_0_2726" ItemType="0" PsrId="306" Leaf="true">
+              <Str Cat="Text">
+                <Val><![CDATA[Cannot find lib definition for '{0}'.]]></Val>
+              </Str>
+              <Disp Icon="Str" />
+            </Item>
+            <Item ItemId=";Cannot_find_lib_definition_for_0_Did_you_mean_1_2727" ItemType="0" PsrId="306" Leaf="true">
+              <Str Cat="Text">
+                <Val><![CDATA[Cannot find lib definition for '{0}'. Did you mean '{1}'?]]></Val>
+              </Str>
+              <Disp Icon="Str" />
+            </Item>
             <Item ItemId=";Cannot_find_module_0_2307" ItemType="0" PsrId="306" Leaf="true">
               <Str Cat="Text">
                 <Val><![CDATA[Cannot find module '{0}'.]]></Val>
@@ -1827,6 +1869,12 @@
               </Str>
               <Disp Icon="Str" />
             </Item>
+            <Item ItemId=";Delete_the_outputs_of_all_projects_6365" ItemType="0" PsrId="306" Leaf="true">
+              <Str Cat="Text">
+                <Val><![CDATA[Delete the outputs of all projects]]></Val>
+              </Str>
+              <Disp Icon="Str" />
+            </Item>
             <Item ItemId=";Deprecated_Use_jsxFactory_instead_Specify_the_object_invoked_for_createElement_when_targeting_react__6084" ItemType="0" PsrId="306" Leaf="true">
               <Str Cat="Text">
                 <Val><![CDATA[[Deprecated]5D; Use '--jsxFactory' instead. Specify the object invoked for createElement when targeting 'react' JSX emit]]></Val>
@@ -2127,6 +2175,12 @@
               </Str>
               <Disp Icon="Str" />
             </Item>
+            <Item ItemId=";Enable_verbose_logging_6366" ItemType="0" PsrId="306" Leaf="true">
+              <Str Cat="Text">
+                <Val><![CDATA[Enable verbose logging]]></Val>
+              </Str>
+              <Disp Icon="Str" />
+            </Item>
             <Item ItemId=";Enables_emit_interoperability_between_CommonJS_and_ES_Modules_via_creation_of_namespace_objects_for__7037" ItemType="0" PsrId="306" Leaf="true">
               <Str Cat="Text">
                 <Val><![CDATA[Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'.]]></Val>
@@ -3693,6 +3747,12 @@
               </Str>
               <Disp Icon="Str" />
             </Item>
+            <Item ItemId=";Option_build_must_be_the_first_command_line_argument_6369" ItemType="0" PsrId="306" Leaf="true">
+              <Str Cat="Text">
+                <Val><![CDATA[Option '--build' must be the first command line argument.]]></Val>
+              </Str>
+              <Disp Icon="Str" />
+            </Item>
             <Item ItemId=";Option_isolatedModules_can_only_be_used_when_either_option_module_is_provided_or_option_target_is_ES_5047" ItemType="0" PsrId="306" Leaf="true">
               <Str Cat="Text">
                 <Val><![CDATA[Option 'isolatedModules' can only be used when either option '--module' is provided or option 'target' is 'ES2015' or higher.]]></Val>
@@ -3717,6 +3777,12 @@
               </Str>
               <Disp Icon="Str" />
             </Item>
+            <Item ItemId=";Options_0_and_1_cannot_be_combined_6370" ItemType="0" PsrId="306" Leaf="true">
+              <Str Cat="Text">
+                <Val><![CDATA[Options '{0}' and '{1}' cannot be combined.]]></Val>
+              </Str>
+              <Disp Icon="Str" />
+            </Item>
             <Item ItemId=";Options_Colon_6027" ItemType="0" PsrId="306" Leaf="true">
               <Str Cat="Text">
                 <Val><![CDATA[Options:]]></Val>
@@ -3999,12 +4065,60 @@
               </Str>
               <Disp Icon="Str" />
             </Item>
+            <Item ItemId=";Project_0_can_t_be_built_because_its_dependency_1_has_errors_6363" ItemType="0" PsrId="306" Leaf="true">
+              <Str Cat="Text">
+                <Val><![CDATA[Project '{0}' can't be built because its dependency '{1}' has errors]]></Val>
+              </Str>
+              <Disp Icon="Str" />
+            </Item>
+            <Item ItemId=";Project_0_is_out_of_date_because_its_dependency_1_is_out_of_date_6353" ItemType="0" PsrId="306" Leaf="true">
+              <Str Cat="Text">
+                <Val><![CDATA[Project '{0}' is out of date because its dependency '{1}' is out of date]]></Val>
+              </Str>
+              <Disp Icon="Str" />
+            </Item>
+            <Item ItemId=";Project_0_is_out_of_date_because_oldest_output_1_is_older_than_newest_input_2_6350" ItemType="0" PsrId="306" Leaf="true">
+              <Str Cat="Text">
+                <Val><![CDATA[Project '{0}' is out of date because oldest output '{1}' is older than newest input '{2}']]></Val>
+              </Str>
+              <Disp Icon="Str" />
+            </Item>
+            <Item ItemId=";Project_0_is_out_of_date_because_output_file_1_does_not_exist_6352" ItemType="0" PsrId="306" Leaf="true">
+              <Str Cat="Text">
+                <Val><![CDATA[Project '{0}' is out of date because output file '{1}' does not exist]]></Val>
+              </Str>
+              <Disp Icon="Str" />
+            </Item>
+            <Item ItemId=";Project_0_is_up_to_date_6361" ItemType="0" PsrId="306" Leaf="true">
+              <Str Cat="Text">
+                <Val><![CDATA[Project '{0}' is up to date]]></Val>
+              </Str>
+              <Disp Icon="Str" />
+            </Item>
+            <Item ItemId=";Project_0_is_up_to_date_because_newest_input_1_is_older_than_oldest_output_2_6351" ItemType="0" PsrId="306" Leaf="true">
+              <Str Cat="Text">
+                <Val><![CDATA[Project '{0}' is up to date because newest input '{1}' is older than oldest output '{2}']]></Val>
+              </Str>
+              <Disp Icon="Str" />
+            </Item>
+            <Item ItemId=";Project_0_is_up_to_date_with_d_ts_files_from_its_dependencies_6354" ItemType="0" PsrId="306" Leaf="true">
+              <Str Cat="Text">
+                <Val><![CDATA[Project '{0}' is up to date with .d.ts files from its dependencies]]></Val>
+              </Str>
+              <Disp Icon="Str" />
+            </Item>
             <Item ItemId=";Project_references_may_not_form_a_circular_graph_Cycle_detected_Colon_0_6202" ItemType="0" PsrId="306" Leaf="true">
               <Str Cat="Text">
                 <Val><![CDATA[Project references may not form a circular graph. Cycle detected: {0}]]></Val>
               </Str>
               <Disp Icon="Str" />
             </Item>
+            <Item ItemId=";Projects_in_this_build_Colon_0_6355" ItemType="0" PsrId="306" Leaf="true">
+              <Str Cat="Text">
+                <Val><![CDATA[Projects in this build: {0}]]></Val>
+              </Str>
+              <Disp Icon="Str" />
+            </Item>
             <Item ItemId=";Projects_to_reference_6300" ItemType="0" PsrId="306" Leaf="true">
               <Str Cat="Text">
                 <Val><![CDATA[Projects to reference]]></Val>
@@ -4683,6 +4797,12 @@
               </Str>
               <Disp Icon="Str" />
             </Item>
+            <Item ItemId=";Show_what_would_be_built_or_deleted_if_specified_with_clean_6367" ItemType="0" PsrId="306" Leaf="true">
+              <Str Cat="Text">
+                <Val><![CDATA[Show what would be built (or deleted, if specified with '--clean')]]></Val>
+              </Str>
+              <Disp Icon="Str" />
+            </Item>
             <Item ItemId=";Signature_0_must_be_a_type_predicate_1224" ItemType="0" PsrId="306" Leaf="true">
               <Str Cat="Text">
                 <Val><![CDATA[Signature '{0}' must be a type predicate.]]></Val>
@@ -4695,6 +4815,18 @@
               </Str>
               <Disp Icon="Str" />
             </Item>
+            <Item ItemId=";Skipping_build_of_project_0_because_its_dependency_1_has_errors_6362" ItemType="0" PsrId="306" Leaf="true">
+              <Str Cat="Text">
+                <Val><![CDATA[Skipping build of project '{0}' because its dependency '{1}' has errors]]></Val>
+              </Str>
+              <Disp Icon="Str" />
+            </Item>
+            <Item ItemId=";Skipping_clean_because_not_all_projects_could_be_located_6371" ItemType="0" PsrId="306" Leaf="true">
+              <Str Cat="Text">
+                <Val><![CDATA[Skipping clean because not all projects could be located]]></Val>
+              </Str>
+              <Disp Icon="Str" />
+            </Item>
             <Item ItemId=";Source_Map_Options_6175" ItemType="0" PsrId="306" Leaf="true">
               <Str Cat="Text">
                 <Val><![CDATA[Source Map Options]]></Val>
@@ -5745,6 +5877,12 @@
               </Str>
               <Disp Icon="Str" />
             </Item>
+            <Item ItemId=";Updating_output_timestamps_of_project_0_6359" ItemType="0" PsrId="306" Leaf="true">
+              <Str Cat="Text">
+                <Val><![CDATA[Updating output timestamps of project '{0}'...]]></Val>
+              </Str>
+              <Disp Icon="Str" />
+            </Item>
             <Item ItemId=";Use_synthetic_default_member_95016" ItemType="0" PsrId="306" Leaf="true">
               <Str Cat="Text">
                 <Val><![CDATA[Use synthetic 'default' member.]]></Val>
@@ -6105,6 +6243,12 @@
               </Str>
               <Disp Icon="Str" />
             </Item>
+            <Item ItemId=";delete_this_Project_0_is_up_to_date_because_it_was_previously_built_6360" ItemType="0" PsrId="306" Leaf="true">
+              <Str Cat="Text">
+                <Val><![CDATA[delete this - Project '{0}' is up to date because it was previously built]]></Val>
+              </Str>
+              <Disp Icon="Str" />
+            </Item>
             <Item ItemId=";enum_declarations_can_only_be_used_in_a_ts_file_8015" ItemType="0" PsrId="306" Leaf="true">
               <Str Cat="Text">
                 <Val><![CDATA['enum declarations' can only be used in a .ts file.]]></Val>
diff --git a/lib/es/diagnosticMessages.generated.json b/lib/es/diagnosticMessages.generated.json
index debe11fef02..d9731da8064 100644
--- a/lib/es/diagnosticMessages.generated.json
+++ b/lib/es/diagnosticMessages.generated.json
@@ -208,6 +208,8 @@
   "Cannot_find_a_tsconfig_json_file_at_the_specified_directory_Colon_0_5057": "No se encuentra ningún archivo tsconfig.json en el directorio especificado: \"{0}\".",
   "Cannot_find_global_type_0_2318": "No se encuentra el tipo '{0}' global.",
   "Cannot_find_global_value_0_2468": "No se encuentra el valor '{0}' global.",
+  "Cannot_find_lib_definition_for_0_2726": "Cannot find lib definition for '{0}'.",
+  "Cannot_find_lib_definition_for_0_Did_you_mean_1_2727": "Cannot find lib definition for '{0}'. Did you mean '{1}'?",
   "Cannot_find_module_0_2307": "No se encuentra el módulo '{0}'.",
   "Cannot_find_name_0_2304": "No se encuentra el nombre '{0}'.",
   "Cannot_find_name_0_Did_you_mean_1_2552": "No se encuentra el nombre \"{0}\". ¿Quería decir \"{1}\"?",
@@ -941,6 +943,7 @@
   "Unexpected_end_of_text_1126": "Final de texto inesperado.",
   "Unexpected_token_1012": "Token inesperado.",
   "Unexpected_token_A_constructor_method_accessor_or_property_was_expected_1068": "Token inesperado. Se esperaba un constructor, un método, un descriptor de acceso o una propiedad.",
+  "Unexpected_token_A_type_parameter_name_was_expected_without_curly_braces_1069": "Token inesperado. Se esperaba un nombre de parámetro de tipo sin llaves.",
   "Unexpected_token_expected_1179": "Token inesperado. Se esperaba \"{\".",
   "Unknown_compiler_option_0_5023": "Opción '{0}' del compilador desconocida.",
   "Unknown_option_excludes_Did_you_mean_exclude_6114": "Opción 'excludes' desconocida. ¿Quería decir 'exclude'?",
diff --git a/lib/fr/diagnosticMessages.generated.json b/lib/fr/diagnosticMessages.generated.json
index 55ad54ddf55..acc764d5c85 100644
--- a/lib/fr/diagnosticMessages.generated.json
+++ b/lib/fr/diagnosticMessages.generated.json
@@ -208,6 +208,8 @@
   "Cannot_find_a_tsconfig_json_file_at_the_specified_directory_Colon_0_5057": "Le fichier tsconfig.json est introuvable dans le répertoire spécifié : '{0}'.",
   "Cannot_find_global_type_0_2318": "Le type global '{0}' est introuvable.",
   "Cannot_find_global_value_0_2468": "La valeur globale '{0}' est introuvable.",
+  "Cannot_find_lib_definition_for_0_2726": "Cannot find lib definition for '{0}'.",
+  "Cannot_find_lib_definition_for_0_Did_you_mean_1_2727": "Cannot find lib definition for '{0}'. Did you mean '{1}'?",
   "Cannot_find_module_0_2307": "Le module '{0}' est introuvable.",
   "Cannot_find_name_0_2304": "Le nom '{0}' est introuvable.",
   "Cannot_find_name_0_Did_you_mean_1_2552": "Le nom '{0}' est introuvable. Est-ce qu'il ne s'agit pas plutôt de '{1}' ?",
@@ -941,6 +943,7 @@
   "Unexpected_end_of_text_1126": "Fin de texte inattendue.",
   "Unexpected_token_1012": "Jeton inattendu.",
   "Unexpected_token_A_constructor_method_accessor_or_property_was_expected_1068": "Jeton inattendu. Un constructeur, une méthode, un accesseur ou une propriété est attendu.",
+  "Unexpected_token_A_type_parameter_name_was_expected_without_curly_braces_1069": "Jeton inattendu. Un nom de paramètre de type est attendu sans accolades.",
   "Unexpected_token_expected_1179": "Jeton inattendu. '{' est attendu.",
   "Unknown_compiler_option_0_5023": "Option de compilateur '{0}' inconnue.",
   "Unknown_option_excludes_Did_you_mean_exclude_6114": "Option 'excludes' inconnue. Voulez-vous utiliser 'exclude' ?",
diff --git a/lib/it/diagnosticMessages.generated.json b/lib/it/diagnosticMessages.generated.json
index d69031f584a..5576154c59c 100644
--- a/lib/it/diagnosticMessages.generated.json
+++ b/lib/it/diagnosticMessages.generated.json
@@ -208,6 +208,8 @@
   "Cannot_find_a_tsconfig_json_file_at_the_specified_directory_Colon_0_5057": "Non è stato trovato alcun file tsconfig.json nella directory specificata '{0}'.",
   "Cannot_find_global_type_0_2318": "Il tipo globale '{0}' non è stato trovato.",
   "Cannot_find_global_value_0_2468": "Il valore globale '{0}' non è stato trovato.",
+  "Cannot_find_lib_definition_for_0_2726": "La definizione della libreria per '{0}' non è stata trovata.",
+  "Cannot_find_lib_definition_for_0_Did_you_mean_1_2727": "La definizione della libreria per '{0}' non è stata trovata. Si intendeva '{1}'?",
   "Cannot_find_module_0_2307": "Il modulo '{0}' non è stato trovato.",
   "Cannot_find_name_0_2304": "Il nome '{0}' non è stato trovato.",
   "Cannot_find_name_0_Did_you_mean_1_2552": "Il nome '{0}' non è stato trovato. Si intendeva '{1}'?",
@@ -941,6 +943,7 @@
   "Unexpected_end_of_text_1126": "Fine del testo imprevista.",
   "Unexpected_token_1012": "Token imprevisto.",
   "Unexpected_token_A_constructor_method_accessor_or_property_was_expected_1068": "Token imprevisto. È previsto un costruttore, un metodo, una funzione di accesso o una proprietà.",
+  "Unexpected_token_A_type_parameter_name_was_expected_without_curly_braces_1069": "Token imprevisto. Sono previsti nomi di parametro senza parentesi graffe.",
   "Unexpected_token_expected_1179": "Token imprevisto. È previsto '{'.",
   "Unknown_compiler_option_0_5023": "Opzione del compilatore sconosciuta: '{0}'.",
   "Unknown_option_excludes_Did_you_mean_exclude_6114": "L'opzione 'excludes' è sconosciuta. Si intendeva 'exclude'?",
diff --git a/lib/ja/diagnosticMessages.generated.json b/lib/ja/diagnosticMessages.generated.json
index 21721d5f147..db7e6b8f2b7 100644
--- a/lib/ja/diagnosticMessages.generated.json
+++ b/lib/ja/diagnosticMessages.generated.json
@@ -208,6 +208,8 @@
   "Cannot_find_a_tsconfig_json_file_at_the_specified_directory_Colon_0_5057": "指定されたディレクトリに tsconfig.json ファイルが見つかりません: '{0}'。",
   "Cannot_find_global_type_0_2318": "グローバル型 '{0}' が見つかりません。",
   "Cannot_find_global_value_0_2468": "グローバル値 '{0}' が見つかりません。",
+  "Cannot_find_lib_definition_for_0_2726": "Cannot find lib definition for '{0}'.",
+  "Cannot_find_lib_definition_for_0_Did_you_mean_1_2727": "Cannot find lib definition for '{0}'. Did you mean '{1}'?",
   "Cannot_find_module_0_2307": "モジュール '{0}' が見つかりません。",
   "Cannot_find_name_0_2304": "名前 '{0}' が見つかりません。",
   "Cannot_find_name_0_Did_you_mean_1_2552": "'{0}' という名前は見つかりません。'{1}' ですか?",
@@ -282,6 +284,8 @@
   "Convert_all_to_default_imports_95035": "すべてを既定のインポートに変換します",
   "Convert_function_0_to_class_95002": "関数 '{0}' をクラスに変換します",
   "Convert_function_to_an_ES2015_class_95001": "関数を ES2015 クラスに変換します",
+  "Convert_named_imports_to_namespace_import_95057": "名前付きインポートを名前空間インポートに変換します",
+  "Convert_namespace_import_to_named_imports_95056": "名前空間インポートを名前付きインポートに変換します",
   "Convert_require_to_import_95047": "'require' を 'import' に変換",
   "Convert_to_ES6_module_95017": "ES6 モジュールに変換します",
   "Convert_to_default_import_95013": "既定のインポートに変換する",
@@ -584,6 +588,7 @@
   "Not_all_code_paths_return_a_value_7030": "一部のコード パスは値を返しません。",
   "Numeric_index_type_0_is_not_assignable_to_string_index_type_1_2413": "数値インデックス型 '{0}' を文字列インデックス型 '{1}' に割り当てることはできません。",
   "Numeric_separators_are_not_allowed_here_6188": "数値の区切り記号は、ここでは使用できません。",
+  "Object_is_of_type_unknown_2571": "オブジェクト型は 'unknown' です。",
   "Object_is_possibly_null_2531": "オブジェクトは 'null' である可能性があります。",
   "Object_is_possibly_null_or_undefined_2533": "オブジェクトは 'null' か 'undefined' である可能性があります。",
   "Object_is_possibly_undefined_2532": "オブジェクトは 'undefined' である可能性があります。",
@@ -938,6 +943,7 @@
   "Unexpected_end_of_text_1126": "予期しないテキストの末尾です。",
   "Unexpected_token_1012": "予期しないトークンです。",
   "Unexpected_token_A_constructor_method_accessor_or_property_was_expected_1068": "予期しないトークンです。コンストラクター、メソッド、アクセサー、またはプロパティが必要です。",
+  "Unexpected_token_A_type_parameter_name_was_expected_without_curly_braces_1069": "予期しないトークンです。型パラメーター名には、中かっこを含めることはできません。",
   "Unexpected_token_expected_1179": "予期しないトークンです。'{' が必要です。",
   "Unknown_compiler_option_0_5023": "コンパイラ オプション '{0}' が不明です。",
   "Unknown_option_excludes_Did_you_mean_exclude_6114": "不明なオプション 'excludes' です。'exclude' ですか?",
diff --git a/lib/ko/diagnosticMessages.generated.json b/lib/ko/diagnosticMessages.generated.json
index a75f68d2b77..35bfec8aa46 100644
--- a/lib/ko/diagnosticMessages.generated.json
+++ b/lib/ko/diagnosticMessages.generated.json
@@ -208,6 +208,8 @@
   "Cannot_find_a_tsconfig_json_file_at_the_specified_directory_Colon_0_5057": "지정된 디렉터리에서 tsconfig.json 파일을 찾을 수 없습니다. '{0}'.",
   "Cannot_find_global_type_0_2318": "전역 형식 '{0}'을(를) 찾을 수 없습니다.",
   "Cannot_find_global_value_0_2468": "전역 값 '{0}'을(를) 찾을 수 없습니다.",
+  "Cannot_find_lib_definition_for_0_2726": "Cannot find lib definition for '{0}'.",
+  "Cannot_find_lib_definition_for_0_Did_you_mean_1_2727": "Cannot find lib definition for '{0}'. Did you mean '{1}'?",
   "Cannot_find_module_0_2307": "'{0}' 모듈을 찾을 수 없습니다.",
   "Cannot_find_name_0_2304": "'{0}' 이름을 찾을 수 없습니다.",
   "Cannot_find_name_0_Did_you_mean_1_2552": "'{0}' 이름을 찾을 수 없습니다. '{1}'을(를) 사용하시겠습니까?",
@@ -941,6 +943,7 @@
   "Unexpected_end_of_text_1126": "예기치 않은 텍스트 끝입니다.",
   "Unexpected_token_1012": "예기치 않은 토큰입니다.",
   "Unexpected_token_A_constructor_method_accessor_or_property_was_expected_1068": "예기치 않은 토큰입니다. 생성자, 메서드, 접근자 또는 속성이 필요합니다.",
+  "Unexpected_token_A_type_parameter_name_was_expected_without_curly_braces_1069": "예기치 않은 토큰입니다. 중괄호가 없는 형식 매개 변수 이름이 필요합니다.",
   "Unexpected_token_expected_1179": "예기치 않은 토큰입니다. '{'가 있어야 합니다.",
   "Unknown_compiler_option_0_5023": "알 수 없는 컴파일러 옵션 '{0}'입니다.",
   "Unknown_option_excludes_Did_you_mean_exclude_6114": "알 수 없는 옵션 'excludes'입니다. 'exclude'를 사용하시겠습니까?",
diff --git a/lib/lib.d.ts b/lib/lib.d.ts
index c2f4120d683..38a1cc0179b 100644
--- a/lib/lib.d.ts
+++ b/lib/lib.d.ts
@@ -18,20543 +18,7 @@ and limitations under the License.
 /// <reference no-default-lib="true"/>
 
 
-/////////////////////////////
-/// ECMAScript APIs
-/////////////////////////////
-
-declare const NaN: number;
-declare const Infinity: number;
-
-/**
-  * Evaluates JavaScript code and executes it.
-  * @param x A String value that contains valid JavaScript code.
-  */
-declare function eval(x: string): any;
-
-/**
-  * Converts A string to an integer.
-  * @param s A string to convert into a number.
-  * @param radix A value between 2 and 36 that specifies the base of the number in numString.
-  * If this argument is not supplied, strings with a prefix of '0x' are considered hexadecimal.
-  * All other strings are considered decimal.
-  */
-declare function parseInt(s: string, radix?: number): number;
-
-/**
-  * Converts a string to a floating-point number.
-  * @param string A string that contains a floating-point number.
-  */
-declare function parseFloat(string: string): number;
-
-/**
-  * Returns a Boolean value that indicates whether a value is the reserved value NaN (not a number).
-  * @param number A numeric value.
-  */
-declare function isNaN(number: number): boolean;
-
-/**
-  * Determines whether a supplied number is finite.
-  * @param number Any numeric value.
-  */
-declare function isFinite(number: number): boolean;
-
-/**
-  * Gets the unencoded version of an encoded Uniform Resource Identifier (URI).
-  * @param encodedURI A value representing an encoded URI.
-  */
-declare function decodeURI(encodedURI: string): string;
-
-/**
-  * Gets the unencoded version of an encoded component of a Uniform Resource Identifier (URI).
-  * @param encodedURIComponent A value representing an encoded URI component.
-  */
-declare function decodeURIComponent(encodedURIComponent: string): string;
-
-/**
-  * Encodes a text string as a valid Uniform Resource Identifier (URI)
-  * @param uri A value representing an encoded URI.
-  */
-declare function encodeURI(uri: string): string;
-
-/**
-  * Encodes a text string as a valid component of a Uniform Resource Identifier (URI).
-  * @param uriComponent A value representing an encoded URI component.
-  */
-declare function encodeURIComponent(uriComponent: string): string;
-
-/**
-  * Computes a new string in which certain characters have been replaced by a hexadecimal escape sequence.
-  * @param string A string value
-  */
-declare function escape(string: string): string;
-
-/**
-  * Computes a new string in which hexadecimal escape sequences are replaced with the character that it represents.
-  * @param string A string value
-  */
-declare function unescape(string: string): string;
-
-interface Symbol {
-  /** Returns a string representation of an object. */
-  toString(): string;
-
-  /** Returns the primitive value of the specified object. */
-  valueOf(): symbol;
-}
-
-declare type PropertyKey = string | number | symbol;
-
-interface PropertyDescriptor {
-    configurable?: boolean;
-    enumerable?: boolean;
-    value?: any;
-    writable?: boolean;
-    get?(): any;
-    set?(v: any): void;
-}
-
-interface PropertyDescriptorMap {
-    [s: string]: PropertyDescriptor;
-}
-
-interface Object {
-    /** The initial value of Object.prototype.constructor is the standard built-in Object constructor. */
-    constructor: Function;
-
-    /** Returns a string representation of an object. */
-    toString(): string;
-
-    /** Returns a date converted to a string using the current locale. */
-    toLocaleString(): string;
-
-    /** Returns the primitive value of the specified object. */
-    valueOf(): Object;
-
-    /**
-      * Determines whether an object has a property with the specified name.
-      * @param v A property name.
-      */
-    hasOwnProperty(v: PropertyKey): boolean;
-
-    /**
-      * Determines whether an object exists in another object's prototype chain.
-      * @param v Another object whose prototype chain is to be checked.
-      */
-    isPrototypeOf(v: Object): boolean;
-
-    /**
-      * Determines whether a specified property is enumerable.
-      * @param v A property name.
-      */
-    propertyIsEnumerable(v: PropertyKey): boolean;
-}
-
-interface ObjectConstructor {
-    new(value?: any): Object;
-    (): any;
-    (value: any): any;
-
-    /** A reference to the prototype for a class of objects. */
-    readonly prototype: Object;
-
-    /**
-      * Returns the prototype of an object.
-      * @param o The object that references the prototype.
-      */
-    getPrototypeOf(o: any): any;
-
-    /**
-      * Gets the own property descriptor of the specified object.
-      * An own property descriptor is one that is defined directly on the object and is not inherited from the object's prototype.
-      * @param o Object that contains the property.
-      * @param p Name of the property.
-    */
-    getOwnPropertyDescriptor(o: any, p: PropertyKey): PropertyDescriptor | undefined;
-
-    /**
-      * Returns the names of the own properties of an object. The own properties of an object are those that are defined directly
-      * on that object, and are not inherited from the object's prototype. The properties of an object include both fields (objects) and functions.
-      * @param o Object that contains the own properties.
-      */
-    getOwnPropertyNames(o: any): string[];
-
-    /**
-      * Creates an object that has the specified prototype or that has null prototype.
-      * @param o Object to use as a prototype. May be null.
-      */
-    create(o: object | null): any;
-
-    /**
-      * Creates an object that has the specified prototype, and that optionally contains specified properties.
-      * @param o Object to use as a prototype. May be null
-      * @param properties JavaScript object that contains one or more property descriptors.
-      */
-    create(o: object | null, properties: PropertyDescriptorMap & ThisType<any>): any;
-
-    /**
-      * Adds a property to an object, or modifies attributes of an existing property.
-      * @param o Object on which to add or modify the property. This can be a native JavaScript object (that is, a user-defined object or a built in object) or a DOM object.
-      * @param p The property name.
-      * @param attributes Descriptor for the property. It can be for a data property or an accessor property.
-      */
-    defineProperty(o: any, p: PropertyKey, attributes: PropertyDescriptor & ThisType<any>): any;
-
-    /**
-      * Adds one or more properties to an object, and/or modifies attributes of existing properties.
-      * @param o Object on which to add or modify the properties. This can be a native JavaScript object or a DOM object.
-      * @param properties JavaScript object that contains one or more descriptor objects. Each descriptor object describes a data property or an accessor property.
-      */
-    defineProperties(o: any, properties: PropertyDescriptorMap & ThisType<any>): any;
-
-    /**
-      * Prevents the modification of attributes of existing properties, and prevents the addition of new properties.
-      * @param o Object on which to lock the attributes.
-      */
-    seal<T>(o: T): T;
-
-    /**
-      * Prevents the modification of existing property attributes and values, and prevents the addition of new properties.
-      * @param o Object on which to lock the attributes.
-      */
-    freeze<T>(a: T[]): ReadonlyArray<T>;
-
-    /**
-      * Prevents the modification of existing property attributes and values, and prevents the addition of new properties.
-      * @param o Object on which to lock the attributes.
-      */
-    freeze<T extends Function>(f: T): T;
-
-    /**
-      * Prevents the modification of existing property attributes and values, and prevents the addition of new properties.
-      * @param o Object on which to lock the attributes.
-      */
-    freeze<T>(o: T): Readonly<T>;
-
-    /**
-      * Prevents the addition of new properties to an object.
-      * @param o Object to make non-extensible.
-      */
-    preventExtensions<T>(o: T): T;
-
-    /**
-      * Returns true if existing property attributes cannot be modified in an object and new properties cannot be added to the object.
-      * @param o Object to test.
-      */
-    isSealed(o: any): boolean;
-
-    /**
-      * Returns true if existing property attributes and values cannot be modified in an object, and new properties cannot be added to the object.
-      * @param o Object to test.
-      */
-    isFrozen(o: any): boolean;
-
-    /**
-      * Returns a value that indicates whether new properties can be added to an object.
-      * @param o Object to test.
-      */
-    isExtensible(o: any): boolean;
-
-    /**
-      * Returns the names of the enumerable properties and methods of an object.
-      * @param o Object that contains the properties and methods. This can be an object that you created or an existing Document Object Model (DOM) object.
-      */
-    keys(o: {}): string[];
-}
-
-/**
-  * Provides functionality common to all JavaScript objects.
-  */
-declare const Object: ObjectConstructor;
-
-/**
-  * Creates a new function.
-  */
-interface Function {
-    /**
-      * Calls the function, substituting the specified object for the this value of the function, and the specified array for the arguments of the function.
-      * @param thisArg The object to be used as the this object.
-      * @param argArray A set of arguments to be passed to the function.
-      */
-    apply(this: Function, thisArg: any, argArray?: any): any;
-
-    /**
-      * Calls a method of an object, substituting another object for the current object.
-      * @param thisArg The object to be used as the current object.
-      * @param argArray A list of arguments to be passed to the method.
-      */
-    call(this: Function, thisArg: any, ...argArray: any[]): any;
-
-    /**
-      * For a given function, creates a bound function that has the same body as the original function.
-      * The this object of the bound function is associated with the specified object, and has the specified initial parameters.
-      * @param thisArg An object to which the this keyword can refer inside the new function.
-      * @param argArray A list of arguments to be passed to the new function.
-      */
-    bind(this: Function, thisArg: any, ...argArray: any[]): any;
-
-    /** Returns a string representation of a function. */
-    toString(): string;
-
-    prototype: any;
-    readonly length: number;
-
-    // Non-standard extensions
-    arguments: any;
-    caller: Function;
-}
-
-interface FunctionConstructor {
-    /**
-      * Creates a new function.
-      * @param args A list of arguments the function accepts.
-      */
-    new(...args: string[]): Function;
-    (...args: string[]): Function;
-    readonly prototype: Function;
-}
-
-declare const Function: FunctionConstructor;
-
-interface IArguments {
-    [index: number]: any;
-    length: number;
-    callee: Function;
-}
-
-interface String {
-    /** Returns a string representation of a string. */
-    toString(): string;
-
-    /**
-      * Returns the character at the specified index.
-      * @param pos The zero-based index of the desired character.
-      */
-    charAt(pos: number): string;
-
-    /**
-      * Returns the Unicode value of the character at the specified location.
-      * @param index The zero-based index of the desired character. If there is no character at the specified index, NaN is returned.
-      */
-    charCodeAt(index: number): number;
-
-    /**
-      * Returns a string that contains the concatenation of two or more strings.
-      * @param strings The strings to append to the end of the string.
-      */
-    concat(...strings: string[]): string;
-
-    /**
-      * Returns the position of the first occurrence of a substring.
-      * @param searchString The substring to search for in the string
-      * @param position The index at which to begin searching the String object. If omitted, search starts at the beginning of the string.
-      */
-    indexOf(searchString: string, position?: number): number;
-
-    /**
-      * Returns the last occurrence of a substring in the string.
-      * @param searchString The substring to search for.
-      * @param position The index at which to begin searching. If omitted, the search begins at the end of the string.
-      */
-    lastIndexOf(searchString: string, position?: number): number;
-
-    /**
-      * Determines whether two strings are equivalent in the current locale.
-      * @param that String to compare to target string
-      */
-    localeCompare(that: string): number;
-
-    /**
-      * Matches a string with a regular expression, and returns an array containing the results of that search.
-      * @param regexp A variable name or string literal containing the regular expression pattern and flags.
-      */
-    match(regexp: string | RegExp): RegExpMatchArray | null;
-
-    /**
-      * Replaces text in a string, using a regular expression or search string.
-      * @param searchValue A string to search for.
-      * @param replaceValue A string containing the text to replace for every successful match of searchValue in this string.
-      */
-    replace(searchValue: string | RegExp, replaceValue: string): string;
-
-    /**
-      * Replaces text in a string, using a regular expression or search string.
-      * @param searchValue A string to search for.
-      * @param replacer A function that returns the replacement text.
-      */
-    replace(searchValue: string | RegExp, replacer: (substring: string, ...args: any[]) => string): string;
-
-    /**
-      * Finds the first substring match in a regular expression search.
-      * @param regexp The regular expression pattern and applicable flags.
-      */
-    search(regexp: string | RegExp): number;
-
-    /**
-      * Returns a section of a string.
-      * @param start The index to the beginning of the specified portion of stringObj.
-      * @param end The index to the end of the specified portion of stringObj. The substring includes the characters up to, but not including, the character indicated by end.
-      * If this value is not specified, the substring continues to the end of stringObj.
-      */
-    slice(start?: number, end?: number): string;
-
-    /**
-      * Split a string into substrings using the specified separator and return them as an array.
-      * @param separator A string that identifies character or characters to use in separating the string. If omitted, a single-element array containing the entire string is returned.
-      * @param limit A value used to limit the number of elements returned in the array.
-      */
-    split(separator: string | RegExp, limit?: number): string[];
-
-    /**
-      * Returns the substring at the specified location within a String object.
-      * @param start The zero-based index number indicating the beginning of the substring.
-      * @param end Zero-based index number indicating the end of the substring. The substring includes the characters up to, but not including, the character indicated by end.
-      * If end is omitted, the characters from start through the end of the original string are returned.
-      */
-    substring(start: number, end?: number): string;
-
-    /** Converts all the alphabetic characters in a string to lowercase. */
-    toLowerCase(): string;
-
-    /** Converts all alphabetic characters to lowercase, taking into account the host environment's current locale. */
-    toLocaleLowerCase(): string;
-
-    /** Converts all the alphabetic characters in a string to uppercase. */
-    toUpperCase(): string;
-
-    /** Returns a string where all alphabetic characters have been converted to uppercase, taking into account the host environment's current locale. */
-    toLocaleUpperCase(): string;
-
-    /** Removes the leading and trailing white space and line terminator characters from a string. */
-    trim(): string;
-
-    /** Returns the length of a String object. */
-    readonly length: number;
-
-    // IE extensions
-    /**
-      * Gets a substring beginning at the specified location and having the specified length.
-      * @param from The starting position of the desired substring. The index of the first character in the string is zero.
-      * @param length The number of characters to include in the returned substring.
-      */
-    substr(from: number, length?: number): string;
-
-    /** Returns the primitive value of the specified object. */
-    valueOf(): string;
-
-    readonly [index: number]: string;
-}
-
-interface StringConstructor {
-    new(value?: any): String;
-    (value?: any): string;
-    readonly prototype: String;
-    fromCharCode(...codes: number[]): string;
-}
-
-/**
-  * Allows manipulation and formatting of text strings and determination and location of substrings within strings.
-  */
-declare const String: StringConstructor;
-
-interface Boolean {
-    /** Returns the primitive value of the specified object. */
-    valueOf(): boolean;
-}
-
-interface BooleanConstructor {
-    new(value?: any): Boolean;
-    (value?: any): boolean;
-    readonly prototype: Boolean;
-}
-
-declare const Boolean: BooleanConstructor;
-
-interface Number {
-    /**
-      * Returns a string representation of an object.
-      * @param radix Specifies a radix for converting numeric values to strings. This value is only used for numbers.
-      */
-    toString(radix?: number): string;
-
-    /**
-      * Returns a string representing a number in fixed-point notation.
-      * @param fractionDigits Number of digits after the decimal point. Must be in the range 0 - 20, inclusive.
-      */
-    toFixed(fractionDigits?: number): string;
-
-    /**
-      * Returns a string containing a number represented in exponential notation.
-      * @param fractionDigits Number of digits after the decimal point. Must be in the range 0 - 20, inclusive.
-      */
-    toExponential(fractionDigits?: number): string;
-
-    /**
-      * Returns a string containing a number represented either in exponential or fixed-point notation with a specified number of digits.
-      * @param precision Number of significant digits. Must be in the range 1 - 21, inclusive.
-      */
-    toPrecision(precision?: number): string;
-
-    /** Returns the primitive value of the specified object. */
-    valueOf(): number;
-}
-
-interface NumberConstructor {
-    new(value?: any): Number;
-    (value?: any): number;
-    readonly prototype: Number;
-
-    /** The largest number that can be represented in JavaScript. Equal to approximately 1.79E+308. */
-    readonly MAX_VALUE: number;
-
-    /** The closest number to zero that can be represented in JavaScript. Equal to approximately 5.00E-324. */
-    readonly MIN_VALUE: number;
-
-    /**
-      * A value that is not a number.
-      * In equality comparisons, NaN does not equal any value, including itself. To test whether a value is equivalent to NaN, use the isNaN function.
-      */
-    readonly NaN: number;
-
-    /**
-      * A value that is less than the largest negative number that can be represented in JavaScript.
-      * JavaScript displays NEGATIVE_INFINITY values as -infinity.
-      */
-    readonly NEGATIVE_INFINITY: number;
-
-    /**
-      * A value greater than the largest number that can be represented in JavaScript.
-      * JavaScript displays POSITIVE_INFINITY values as infinity.
-      */
-    readonly POSITIVE_INFINITY: number;
-}
-
-/** An object that represents a number of any kind. All JavaScript numbers are 64-bit floating-point numbers. */
-declare const Number: NumberConstructor;
-
-interface TemplateStringsArray extends ReadonlyArray<string> {
-    readonly raw: ReadonlyArray<string>;
-}
-
-/**
- * The type of `import.meta`.
- * 
- * If you need to declare that a given property exists on `import.meta`,
- * this type may be augmented via interface merging.
- */
-interface ImportMeta {
-}
-
-interface Math {
-    /** The mathematical constant e. This is Euler's number, the base of natural logarithms. */
-    readonly E: number;
-    /** The natural logarithm of 10. */
-    readonly LN10: number;
-    /** The natural logarithm of 2. */
-    readonly LN2: number;
-    /** The base-2 logarithm of e. */
-    readonly LOG2E: number;
-    /** The base-10 logarithm of e. */
-    readonly LOG10E: number;
-    /** Pi. This is the ratio of the circumference of a circle to its diameter. */
-    readonly PI: number;
-    /** The square root of 0.5, or, equivalently, one divided by the square root of 2. */
-    readonly SQRT1_2: number;
-    /** The square root of 2. */
-    readonly SQRT2: number;
-    /**
-      * Returns the absolute value of a number (the value without regard to whether it is positive or negative).
-      * For example, the absolute value of -5 is the same as the absolute value of 5.
-      * @param x A numeric expression for which the absolute value is needed.
-      */
-    abs(x: number): number;
-    /**
-      * Returns the arc cosine (or inverse cosine) of a number.
-      * @param x A numeric expression.
-      */
-    acos(x: number): number;
-    /**
-      * Returns the arcsine of a number.
-      * @param x A numeric expression.
-      */
-    asin(x: number): number;
-    /**
-      * Returns the arctangent of a number.
-      * @param x A numeric expression for which the arctangent is needed.
-      */
-    atan(x: number): number;
-    /**
-      * Returns the angle (in radians) from the X axis to a point.
-      * @param y A numeric expression representing the cartesian y-coordinate.
-      * @param x A numeric expression representing the cartesian x-coordinate.
-      */
-    atan2(y: number, x: number): number;
-    /**
-      * Returns the smallest integer greater than or equal to its numeric argument.
-      * @param x A numeric expression.
-      */
-    ceil(x: number): number;
-    /**
-      * Returns the cosine of a number.
-      * @param x A numeric expression that contains an angle measured in radians.
-      */
-    cos(x: number): number;
-    /**
-      * Returns e (the base of natural logarithms) raised to a power.
-      * @param x A numeric expression representing the power of e.
-      */
-    exp(x: number): number;
-    /**
-      * Returns the greatest integer less than or equal to its numeric argument.
-      * @param x A numeric expression.
-      */
-    floor(x: number): number;
-    /**
-      * Returns the natural logarithm (base e) of a number.
-      * @param x A numeric expression.
-      */
-    log(x: number): number;
-    /**
-      * Returns the larger of a set of supplied numeric expressions.
-      * @param values Numeric expressions to be evaluated.
-      */
-    max(...values: number[]): number;
-    /**
-      * Returns the smaller of a set of supplied numeric expressions.
-      * @param values Numeric expressions to be evaluated.
-      */
-    min(...values: number[]): number;
-    /**
-      * Returns the value of a base expression taken to a specified power.
-      * @param x The base value of the expression.
-      * @param y The exponent value of the expression.
-      */
-    pow(x: number, y: number): number;
-    /** Returns a pseudorandom number between 0 and 1. */
-    random(): number;
-    /**
-      * Returns a supplied numeric expression rounded to the nearest number.
-      * @param x The value to be rounded to the nearest number.
-      */
-    round(x: number): number;
-    /**
-      * Returns the sine of a number.
-      * @param x A numeric expression that contains an angle measured in radians.
-      */
-    sin(x: number): number;
-    /**
-      * Returns the square root of a number.
-      * @param x A numeric expression.
-      */
-    sqrt(x: number): number;
-    /**
-      * Returns the tangent of a number.
-      * @param x A numeric expression that contains an angle measured in radians.
-      */
-    tan(x: number): number;
-}
-/** An intrinsic object that provides basic mathematics functionality and constants. */
-declare const Math: Math;
-
-/** Enables basic storage and retrieval of dates and times. */
-interface Date {
-    /** Returns a string representation of a date. The format of the string depends on the locale. */
-    toString(): string;
-    /** Returns a date as a string value. */
-    toDateString(): string;
-    /** Returns a time as a string value. */
-    toTimeString(): string;
-    /** Returns a value as a string value appropriate to the host environment's current locale. */
-    toLocaleString(): string;
-    /** Returns a date as a string value appropriate to the host environment's current locale. */
-    toLocaleDateString(): string;
-    /** Returns a time as a string value appropriate to the host environment's current locale. */
-    toLocaleTimeString(): string;
-    /** Returns the stored time value in milliseconds since midnight, January 1, 1970 UTC. */
-    valueOf(): number;
-    /** Gets the time value in milliseconds. */
-    getTime(): number;
-    /** Gets the year, using local time. */
-    getFullYear(): number;
-    /** Gets the year using Universal Coordinated Time (UTC). */
-    getUTCFullYear(): number;
-    /** Gets the month, using local time. */
-    getMonth(): number;
-    /** Gets the month of a Date object using Universal Coordinated Time (UTC). */
-    getUTCMonth(): number;
-    /** Gets the day-of-the-month, using local time. */
-    getDate(): number;
-    /** Gets the day-of-the-month, using Universal Coordinated Time (UTC). */
-    getUTCDate(): number;
-    /** Gets the day of the week, using local time. */
-    getDay(): number;
-    /** Gets the day of the week using Universal Coordinated Time (UTC). */
-    getUTCDay(): number;
-    /** Gets the hours in a date, using local time. */
-    getHours(): number;
-    /** Gets the hours value in a Date object using Universal Coordinated Time (UTC). */
-    getUTCHours(): number;
-    /** Gets the minutes of a Date object, using local time. */
-    getMinutes(): number;
-    /** Gets the minutes of a Date object using Universal Coordinated Time (UTC). */
-    getUTCMinutes(): number;
-    /** Gets the seconds of a Date object, using local time. */
-    getSeconds(): number;
-    /** Gets the seconds of a Date object using Universal Coordinated Time (UTC). */
-    getUTCSeconds(): number;
-    /** Gets the milliseconds of a Date, using local time. */
-    getMilliseconds(): number;
-    /** Gets the milliseconds of a Date object using Universal Coordinated Time (UTC). */
-    getUTCMilliseconds(): number;
-    /** Gets the difference in minutes between the time on the local computer and Universal Coordinated Time (UTC). */
-    getTimezoneOffset(): number;
-    /**
-      * Sets the date and time value in the Date object.
-      * @param time A numeric value representing the number of elapsed milliseconds since midnight, January 1, 1970 GMT.
-      */
-    setTime(time: number): number;
-    /**
-      * Sets the milliseconds value in the Date object using local time.
-      * @param ms A numeric value equal to the millisecond value.
-      */
-    setMilliseconds(ms: number): number;
-    /**
-      * Sets the milliseconds value in the Date object using Universal Coordinated Time (UTC).
-      * @param ms A numeric value equal to the millisecond value.
-      */
-    setUTCMilliseconds(ms: number): number;
-
-    /**
-      * Sets the seconds value in the Date object using local time.
-      * @param sec A numeric value equal to the seconds value.
-      * @param ms A numeric value equal to the milliseconds value.
-      */
-    setSeconds(sec: number, ms?: number): number;
-    /**
-      * Sets the seconds value in the Date object using Universal Coordinated Time (UTC).
-      * @param sec A numeric value equal to the seconds value.
-      * @param ms A numeric value equal to the milliseconds value.
-      */
-    setUTCSeconds(sec: number, ms?: number): number;
-    /**
-      * Sets the minutes value in the Date object using local time.
-      * @param min A numeric value equal to the minutes value.
-      * @param sec A numeric value equal to the seconds value.
-      * @param ms A numeric value equal to the milliseconds value.
-      */
-    setMinutes(min: number, sec?: number, ms?: number): number;
-    /**
-      * Sets the minutes value in the Date object using Universal Coordinated Time (UTC).
-      * @param min A numeric value equal to the minutes value.
-      * @param sec A numeric value equal to the seconds value.
-      * @param ms A numeric value equal to the milliseconds value.
-      */
-    setUTCMinutes(min: number, sec?: number, ms?: number): number;
-    /**
-      * Sets the hour value in the Date object using local time.
-      * @param hours A numeric value equal to the hours value.
-      * @param min A numeric value equal to the minutes value.
-      * @param sec A numeric value equal to the seconds value.
-      * @param ms A numeric value equal to the milliseconds value.
-      */
-    setHours(hours: number, min?: number, sec?: number, ms?: number): number;
-    /**
-      * Sets the hours value in the Date object using Universal Coordinated Time (UTC).
-      * @param hours A numeric value equal to the hours value.
-      * @param min A numeric value equal to the minutes value.
-      * @param sec A numeric value equal to the seconds value.
-      * @param ms A numeric value equal to the milliseconds value.
-      */
-    setUTCHours(hours: number, min?: number, sec?: number, ms?: number): number;
-    /**
-      * Sets the numeric day-of-the-month value of the Date object using local time.
-      * @param date A numeric value equal to the day of the month.
-      */
-    setDate(date: number): number;
-    /**
-      * Sets the numeric day of the month in the Date object using Universal Coordinated Time (UTC).
-      * @param date A numeric value equal to the day of the month.
-      */
-    setUTCDate(date: number): number;
-    /**
-      * Sets the month value in the Date object using local time.
-      * @param month A numeric value equal to the month. The value for January is 0, and other month values follow consecutively.
-      * @param date A numeric value representing the day of the month. If this value is not supplied, the value from a call to the getDate method is used.
-      */
-    setMonth(month: number, date?: number): number;
-    /**
-      * Sets the month value in the Date object using Universal Coordinated Time (UTC).
-      * @param month A numeric value equal to the month. The value for January is 0, and other month values follow consecutively.
-      * @param date A numeric value representing the day of the month. If it is not supplied, the value from a call to the getUTCDate method is used.
-      */
-    setUTCMonth(month: number, date?: number): number;
-    /**
-      * Sets the year of the Date object using local time.
-      * @param year A numeric value for the year.
-      * @param month A zero-based numeric value for the month (0 for January, 11 for December). Must be specified if numDate is specified.
-      * @param date A numeric value equal for the day of the month.
-      */
-    setFullYear(year: number, month?: number, date?: number): number;
-    /**
-      * Sets the year value in the Date object using Universal Coordinated Time (UTC).
-      * @param year A numeric value equal to the year.
-      * @param month A numeric value equal to the month. The value for January is 0, and other month values follow consecutively. Must be supplied if numDate is supplied.
-      * @param date A numeric value equal to the day of the month.
-      */
-    setUTCFullYear(year: number, month?: number, date?: number): number;
-    /** Returns a date converted to a string using Universal Coordinated Time (UTC). */
-    toUTCString(): string;
-    /** Returns a date as a string value in ISO format. */
-    toISOString(): string;
-    /** Used by the JSON.stringify method to enable the transformation of an object's data for JavaScript Object Notation (JSON) serialization. */
-    toJSON(key?: any): string;
-}
-
-interface DateConstructor {
-    new(): Date;
-    new(value: number | string): Date;
-    new(year: number, month: number, date?: number, hours?: number, minutes?: number, seconds?: number, ms?: number): Date;
-    (): string;
-    readonly prototype: Date;
-    /**
-      * Parses a string containing a date, and returns the number of milliseconds between that date and midnight, January 1, 1970.
-      * @param s A date string
-      */
-    parse(s: string): number;
-    /**
-      * Returns the number of milliseconds between midnight, January 1, 1970 Universal Coordinated Time (UTC) (or GMT) and the specified date.
-      * @param year The full year designation is required for cross-century date accuracy. If year is between 0 and 99 is used, then year is assumed to be 1900 + year.
-      * @param month The month as an number between 0 and 11 (January to December).
-      * @param date The date as an number between 1 and 31.
-      * @param hours Must be supplied if minutes is supplied. An number from 0 to 23 (midnight to 11pm) that specifies the hour.
-      * @param minutes Must be supplied if seconds is supplied. An number from 0 to 59 that specifies the minutes.
-      * @param seconds Must be supplied if milliseconds is supplied. An number from 0 to 59 that specifies the seconds.
-      * @param ms An number from 0 to 999 that specifies the milliseconds.
-      */
-    UTC(year: number, month: number, date?: number, hours?: number, minutes?: number, seconds?: number, ms?: number): number;
-    now(): number;
-}
-
-declare const Date: DateConstructor;
-
-interface RegExpMatchArray extends Array<string> {
-    index?: number;
-    input?: string;
-}
-
-interface RegExpExecArray extends Array<string> {
-    index: number;
-    input: string;
-}
-
-interface RegExp {
-    /**
-      * Executes a search on a string using a regular expression pattern, and returns an array containing the results of that search.
-      * @param string The String object or string literal on which to perform the search.
-      */
-    exec(string: string): RegExpExecArray | null;
-
-    /**
-      * Returns a Boolean value that indicates whether or not a pattern exists in a searched string.
-      * @param string String on which to perform the search.
-      */
-    test(string: string): boolean;
-
-    /** Returns a copy of the text of the regular expression pattern. Read-only. The regExp argument is a Regular expression object. It can be a variable name or a literal. */
-    readonly source: string;
-
-    /** Returns a Boolean value indicating the state of the global flag (g) used with a regular expression. Default is false. Read-only. */
-    readonly global: boolean;
-
-    /** Returns a Boolean value indicating the state of the ignoreCase flag (i) used with a regular expression. Default is false. Read-only. */
-    readonly ignoreCase: boolean;
-
-    /** Returns a Boolean value indicating the state of the multiline flag (m) used with a regular expression. Default is false. Read-only. */
-    readonly multiline: boolean;
-
-    lastIndex: number;
-
-    // Non-standard extensions
-    compile(): this;
-}
-
-interface RegExpConstructor {
-    new(pattern: RegExp | string): RegExp;
-    new(pattern: string, flags?: string): RegExp;
-    (pattern: RegExp | string): RegExp;
-    (pattern: string, flags?: string): RegExp;
-    readonly prototype: RegExp;
-
-    // Non-standard extensions
-    $1: string;
-    $2: string;
-    $3: string;
-    $4: string;
-    $5: string;
-    $6: string;
-    $7: string;
-    $8: string;
-    $9: string;
-    lastMatch: string;
-}
-
-declare const RegExp: RegExpConstructor;
-
-interface Error {
-    name: string;
-    message: string;
-    stack?: string;
-}
-
-interface ErrorConstructor {
-    new(message?: string): Error;
-    (message?: string): Error;
-    readonly prototype: Error;
-}
-
-declare const Error: ErrorConstructor;
-
-interface EvalError extends Error {
-}
-
-interface EvalErrorConstructor {
-    new(message?: string): EvalError;
-    (message?: string): EvalError;
-    readonly prototype: EvalError;
-}
-
-declare const EvalError: EvalErrorConstructor;
-
-interface RangeError extends Error {
-}
-
-interface RangeErrorConstructor {
-    new(message?: string): RangeError;
-    (message?: string): RangeError;
-    readonly prototype: RangeError;
-}
-
-declare const RangeError: RangeErrorConstructor;
-
-interface ReferenceError extends Error {
-}
-
-interface ReferenceErrorConstructor {
-    new(message?: string): ReferenceError;
-    (message?: string): ReferenceError;
-    readonly prototype: ReferenceError;
-}
-
-declare const ReferenceError: ReferenceErrorConstructor;
-
-interface SyntaxError extends Error {
-}
-
-interface SyntaxErrorConstructor {
-    new(message?: string): SyntaxError;
-    (message?: string): SyntaxError;
-    readonly prototype: SyntaxError;
-}
-
-declare const SyntaxError: SyntaxErrorConstructor;
-
-interface TypeError extends Error {
-}
-
-interface TypeErrorConstructor {
-    new(message?: string): TypeError;
-    (message?: string): TypeError;
-    readonly prototype: TypeError;
-}
-
-declare const TypeError: TypeErrorConstructor;
-
-interface URIError extends Error {
-}
-
-interface URIErrorConstructor {
-    new(message?: string): URIError;
-    (message?: string): URIError;
-    readonly prototype: URIError;
-}
-
-declare const URIError: URIErrorConstructor;
-
-interface JSON {
-    /**
-      * Converts a JavaScript Object Notation (JSON) string into an object.
-      * @param text A valid JSON string.
-      * @param reviver A function that transforms the results. This function is called for each member of the object.
-      * If a member contains nested objects, the nested objects are transformed before the parent object is.
-      */
-    parse(text: string, reviver?: (key: any, value: any) => any): any;
-    /**
-      * Converts a JavaScript value to a JavaScript Object Notation (JSON) string.
-      * @param value A JavaScript value, usually an object or array, to be converted.
-      * @param replacer A function that transforms the results.
-      * @param space Adds indentation, white space, and line break characters to the return-value JSON text to make it easier to read.
-      */
-    stringify(value: any, replacer?: (key: string, value: any) => any, space?: string | number): string;
-    /**
-      * Converts a JavaScript value to a JavaScript Object Notation (JSON) string.
-      * @param value A JavaScript value, usually an object or array, to be converted.
-      * @param replacer An array of strings and numbers that acts as a approved list for selecting the object properties that will be stringified.
-      * @param space Adds indentation, white space, and line break characters to the return-value JSON text to make it easier to read.
-      */
-    stringify(value: any, replacer?: (number | string)[] | null, space?: string | number): string;
-}
-
-/**
-  * An intrinsic object that provides functions to convert JavaScript values to and from the JavaScript Object Notation (JSON) format.
-  */
-declare const JSON: JSON;
-
-
-/////////////////////////////
-/// ECMAScript Array API (specially handled by compiler)
-/////////////////////////////
-
-interface ReadonlyArray<T> {
-    /**
-      * Gets the length of the array. This is a number one higher than the highest element defined in an array.
-      */
-    readonly length: number;
-    /**
-      * Returns a string representation of an array.
-      */
-    toString(): string;
-    /**
-      * Returns a string representation of an array. The elements are converted to string using their toLocalString methods.
-      */
-    toLocaleString(): string;
-    /**
-      * Combines two or more arrays.
-      * @param items Additional items to add to the end of array1.
-      */
-    concat(...items: ConcatArray<T>[]): T[];
-    /**
-      * Combines two or more arrays.
-      * @param items Additional items to add to the end of array1.
-      */
-    concat(...items: (T | ConcatArray<T>)[]): T[];
-    /**
-      * Adds all the elements of an array separated by the specified separator string.
-      * @param separator A string used to separate one element of an array from the next in the resulting String. If omitted, the array elements are separated with a comma.
-      */
-    join(separator?: string): string;
-    /**
-      * Returns a section of an array.
-      * @param start The beginning of the specified portion of the array.
-      * @param end The end of the specified portion of the array.
-      */
-    slice(start?: number, end?: number): T[];
-    /**
-      * Returns the index of the first occurrence of a value in an array.
-      * @param searchElement The value to locate in the array.
-      * @param fromIndex The array index at which to begin the search. If fromIndex is omitted, the search starts at index 0.
-      */
-    indexOf(searchElement: T, fromIndex?: number): number;
-    /**
-      * Returns the index of the last occurrence of a specified value in an array.
-      * @param searchElement The value to locate in the array.
-      * @param fromIndex The array index at which to begin the search. If fromIndex is omitted, the search starts at the last index in the array.
-      */
-    lastIndexOf(searchElement: T, fromIndex?: number): number;
-    /**
-      * Determines whether all the members of an array satisfy the specified test.
-      * @param callbackfn A function that accepts up to three arguments. The every method calls the callbackfn function for each element in array1 until the callbackfn returns false, or until the end of the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
-      */
-    every(callbackfn: (value: T, index: number, array: ReadonlyArray<T>) => boolean, thisArg?: any): boolean;
-    /**
-      * Determines whether the specified callback function returns true for any element of an array.
-      * @param callbackfn A function that accepts up to three arguments. The some method calls the callbackfn function for each element in array1 until the callbackfn returns true, or until the end of the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
-      */
-    some(callbackfn: (value: T, index: number, array: ReadonlyArray<T>) => boolean, thisArg?: any): boolean;
-    /**
-      * Performs the specified action for each element in an array.
-      * @param callbackfn  A function that accepts up to three arguments. forEach calls the callbackfn function one time for each element in the array.
-      * @param thisArg  An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
-      */
-    forEach(callbackfn: (value: T, index: number, array: ReadonlyArray<T>) => void, thisArg?: any): void;
-    /**
-      * Calls a defined callback function on each element of an array, and returns an array that contains the results.
-      * @param callbackfn A function that accepts up to three arguments. The map method calls the callbackfn function one time for each element in the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
-      */
-    map<U>(callbackfn: (value: T, index: number, array: ReadonlyArray<T>) => U, thisArg?: any): U[];
-    /**
-     * Returns the elements of an array that meet the condition specified in a callback function.
-     * @param callbackfn A function that accepts up to three arguments. The filter method calls the callbackfn function one time for each element in the array.
-     * @param thisArg An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
-     */
-    filter<S extends T>(callbackfn: (value: T, index: number, array: ReadonlyArray<T>) => value is S, thisArg?: any): S[];
-    /**
-      * Returns the elements of an array that meet the condition specified in a callback function.
-      * @param callbackfn A function that accepts up to three arguments. The filter method calls the callbackfn function one time for each element in the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
-      */
-    filter(callbackfn: (value: T, index: number, array: ReadonlyArray<T>) => any, thisArg?: any): T[];
-    /**
-      * Calls the specified callback function for all the elements in an array. The return value of the callback function is the accumulated result, and is provided as an argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduce method calls the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start the accumulation. The first call to the callbackfn function provides this value as an argument instead of an array value.
-      */
-    reduce(callbackfn: (previousValue: T, currentValue: T, currentIndex: number, array: ReadonlyArray<T>) => T): T;
-    reduce(callbackfn: (previousValue: T, currentValue: T, currentIndex: number, array: ReadonlyArray<T>) => T, initialValue: T): T;
-    /**
-      * Calls the specified callback function for all the elements in an array. The return value of the callback function is the accumulated result, and is provided as an argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduce method calls the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start the accumulation. The first call to the callbackfn function provides this value as an argument instead of an array value.
-      */
-    reduce<U>(callbackfn: (previousValue: U, currentValue: T, currentIndex: number, array: ReadonlyArray<T>) => U, initialValue: U): U;
-    /**
-      * Calls the specified callback function for all the elements in an array, in descending order. The return value of the callback function is the accumulated result, and is provided as an argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduceRight method calls the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start the accumulation. The first call to the callbackfn function provides this value as an argument instead of an array value.
-      */
-    reduceRight(callbackfn: (previousValue: T, currentValue: T, currentIndex: number, array: ReadonlyArray<T>) => T): T;
-    reduceRight(callbackfn: (previousValue: T, currentValue: T, currentIndex: number, array: ReadonlyArray<T>) => T, initialValue: T): T;
-    /**
-      * Calls the specified callback function for all the elements in an array, in descending order. The return value of the callback function is the accumulated result, and is provided as an argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduceRight method calls the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start the accumulation. The first call to the callbackfn function provides this value as an argument instead of an array value.
-      */
-    reduceRight<U>(callbackfn: (previousValue: U, currentValue: T, currentIndex: number, array: ReadonlyArray<T>) => U, initialValue: U): U;
-
-    readonly [n: number]: T;
-}
-
-interface ConcatArray<T> {
-    readonly length: number;
-    readonly [n: number]: T;
-    join(separator?: string): string;
-    slice(start?: number, end?: number): T[];
-}
-
-interface Array<T> {
-    /**
-      * Gets or sets the length of the array. This is a number one higher than the highest element defined in an array.
-      */
-    length: number;
-    /**
-      * Returns a string representation of an array.
-      */
-    toString(): string;
-    /**
-      * Returns a string representation of an array. The elements are converted to string using their toLocalString methods.
-      */
-    toLocaleString(): string;
-    /**
-      * Appends new elements to an array, and returns the new length of the array.
-      * @param items New elements of the Array.
-      */
-    push(...items: T[]): number;
-    /**
-      * Removes the last element from an array and returns it.
-      */
-    pop(): T | undefined;
-    /**
-      * Combines two or more arrays.
-      * @param items Additional items to add to the end of array1.
-      */
-    concat(...items: ConcatArray<T>[]): T[];
-    /**
-      * Combines two or more arrays.
-      * @param items Additional items to add to the end of array1.
-      */
-    concat(...items: (T | ConcatArray<T>)[]): T[];
-    /**
-      * Adds all the elements of an array separated by the specified separator string.
-      * @param separator A string used to separate one element of an array from the next in the resulting String. If omitted, the array elements are separated with a comma.
-      */
-    join(separator?: string): string;
-    /**
-      * Reverses the elements in an Array.
-      */
-    reverse(): T[];
-    /**
-      * Removes the first element from an array and returns it.
-      */
-    shift(): T | undefined;
-    /**
-      * Returns a section of an array.
-      * @param start The beginning of the specified portion of the array.
-      * @param end The end of the specified portion of the array.
-      */
-    slice(start?: number, end?: number): T[];
-    /**
-      * Sorts an array.
-      * @param compareFn The name of the function used to determine the order of the elements. If omitted, the elements are sorted in ascending, ASCII character order.
-      */
-    sort(compareFn?: (a: T, b: T) => number): this;
-    /**
-      * Removes elements from an array and, if necessary, inserts new elements in their place, returning the deleted elements.
-      * @param start The zero-based location in the array from which to start removing elements.
-      * @param deleteCount The number of elements to remove.
-      */
-    splice(start: number, deleteCount?: number): T[];
-    /**
-      * Removes elements from an array and, if necessary, inserts new elements in their place, returning the deleted elements.
-      * @param start The zero-based location in the array from which to start removing elements.
-      * @param deleteCount The number of elements to remove.
-      * @param items Elements to insert into the array in place of the deleted elements.
-      */
-    splice(start: number, deleteCount: number, ...items: T[]): T[];
-    /**
-      * Inserts new elements at the start of an array.
-      * @param items  Elements to insert at the start of the Array.
-      */
-    unshift(...items: T[]): number;
-    /**
-      * Returns the index of the first occurrence of a value in an array.
-      * @param searchElement The value to locate in the array.
-      * @param fromIndex The array index at which to begin the search. If fromIndex is omitted, the search starts at index 0.
-      */
-    indexOf(searchElement: T, fromIndex?: number): number;
-    /**
-      * Returns the index of the last occurrence of a specified value in an array.
-      * @param searchElement The value to locate in the array.
-      * @param fromIndex The array index at which to begin the search. If fromIndex is omitted, the search starts at the last index in the array.
-      */
-    lastIndexOf(searchElement: T, fromIndex?: number): number;
-    /**
-      * Determines whether all the members of an array satisfy the specified test.
-      * @param callbackfn A function that accepts up to three arguments. The every method calls the callbackfn function for each element in array1 until the callbackfn returns false, or until the end of the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
-      */
-    every(callbackfn: (value: T, index: number, array: T[]) => boolean, thisArg?: any): boolean;
-    /**
-      * Determines whether the specified callback function returns true for any element of an array.
-      * @param callbackfn A function that accepts up to three arguments. The some method calls the callbackfn function for each element in array1 until the callbackfn returns true, or until the end of the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
-      */
-    some(callbackfn: (value: T, index: number, array: T[]) => boolean, thisArg?: any): boolean;
-    /**
-      * Performs the specified action for each element in an array.
-      * @param callbackfn  A function that accepts up to three arguments. forEach calls the callbackfn function one time for each element in the array.
-      * @param thisArg  An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
-      */
-    forEach(callbackfn: (value: T, index: number, array: T[]) => void, thisArg?: any): void;
-    /**
-      * Calls a defined callback function on each element of an array, and returns an array that contains the results.
-      * @param callbackfn A function that accepts up to three arguments. The map method calls the callbackfn function one time for each element in the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
-      */
-    map<U>(callbackfn: (value: T, index: number, array: T[]) => U, thisArg?: any): U[];
-    /**
-     * Returns the elements of an array that meet the condition specified in a callback function.
-     * @param callbackfn A function that accepts up to three arguments. The filter method calls the callbackfn function one time for each element in the array.
-     * @param thisArg An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
-     */
-    filter<S extends T>(callbackfn: (value: T, index: number, array: T[]) => value is S, thisArg?: any): S[];
-    /**
-      * Returns the elements of an array that meet the condition specified in a callback function.
-      * @param callbackfn A function that accepts up to three arguments. The filter method calls the callbackfn function one time for each element in the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
-      */
-    filter(callbackfn: (value: T, index: number, array: T[]) => any, thisArg?: any): T[];
-    /**
-      * Calls the specified callback function for all the elements in an array. The return value of the callback function is the accumulated result, and is provided as an argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduce method calls the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start the accumulation. The first call to the callbackfn function provides this value as an argument instead of an array value.
-      */
-    reduce(callbackfn: (previousValue: T, currentValue: T, currentIndex: number, array: T[]) => T): T;
-    reduce(callbackfn: (previousValue: T, currentValue: T, currentIndex: number, array: T[]) => T, initialValue: T): T;
-    /**
-      * Calls the specified callback function for all the elements in an array. The return value of the callback function is the accumulated result, and is provided as an argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduce method calls the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start the accumulation. The first call to the callbackfn function provides this value as an argument instead of an array value.
-      */
-    reduce<U>(callbackfn: (previousValue: U, currentValue: T, currentIndex: number, array: T[]) => U, initialValue: U): U;
-    /**
-      * Calls the specified callback function for all the elements in an array, in descending order. The return value of the callback function is the accumulated result, and is provided as an argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduceRight method calls the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start the accumulation. The first call to the callbackfn function provides this value as an argument instead of an array value.
-      */
-    reduceRight(callbackfn: (previousValue: T, currentValue: T, currentIndex: number, array: T[]) => T): T;
-    reduceRight(callbackfn: (previousValue: T, currentValue: T, currentIndex: number, array: T[]) => T, initialValue: T): T;
-    /**
-      * Calls the specified callback function for all the elements in an array, in descending order. The return value of the callback function is the accumulated result, and is provided as an argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduceRight method calls the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start the accumulation. The first call to the callbackfn function provides this value as an argument instead of an array value.
-      */
-    reduceRight<U>(callbackfn: (previousValue: U, currentValue: T, currentIndex: number, array: T[]) => U, initialValue: U): U;
-
-    [n: number]: T;
-}
-
-interface ArrayConstructor {
-    new(arrayLength?: number): any[];
-    new <T>(arrayLength: number): T[];
-    new <T>(...items: T[]): T[];
-    (arrayLength?: number): any[];
-    <T>(arrayLength: number): T[];
-    <T>(...items: T[]): T[];
-    isArray(arg: any): arg is Array<any>;
-    readonly prototype: Array<any>;
-}
-
-declare const Array: ArrayConstructor;
-
-interface TypedPropertyDescriptor<T> {
-    enumerable?: boolean;
-    configurable?: boolean;
-    writable?: boolean;
-    value?: T;
-    get?: () => T;
-    set?: (value: T) => void;
-}
-
-declare type ClassDecorator = <TFunction extends Function>(target: TFunction) => TFunction | void;
-declare type PropertyDecorator = (target: Object, propertyKey: string | symbol) => void;
-declare type MethodDecorator = <T>(target: Object, propertyKey: string | symbol, descriptor: TypedPropertyDescriptor<T>) => TypedPropertyDescriptor<T> | void;
-declare type ParameterDecorator = (target: Object, propertyKey: string | symbol, parameterIndex: number) => void;
-
-declare type PromiseConstructorLike = new <T>(executor: (resolve: (value?: T | PromiseLike<T>) => void, reject: (reason?: any) => void) => void) => PromiseLike<T>;
-
-interface PromiseLike<T> {
-    /**
-     * Attaches callbacks for the resolution and/or rejection of the Promise.
-     * @param onfulfilled The callback to execute when the Promise is resolved.
-     * @param onrejected The callback to execute when the Promise is rejected.
-     * @returns A Promise for the completion of which ever callback is executed.
-     */
-    then<TResult1 = T, TResult2 = never>(onfulfilled?: ((value: T) => TResult1 | PromiseLike<TResult1>) | undefined | null, onrejected?: ((reason: any) => TResult2 | PromiseLike<TResult2>) | undefined | null): PromiseLike<TResult1 | TResult2>;
-}
-
-/**
- * Represents the completion of an asynchronous operation
- */
-interface Promise<T> {
-    /**
-     * Attaches callbacks for the resolution and/or rejection of the Promise.
-     * @param onfulfilled The callback to execute when the Promise is resolved.
-     * @param onrejected The callback to execute when the Promise is rejected.
-     * @returns A Promise for the completion of which ever callback is executed.
-     */
-    then<TResult1 = T, TResult2 = never>(onfulfilled?: ((value: T) => TResult1 | PromiseLike<TResult1>) | undefined | null, onrejected?: ((reason: any) => TResult2 | PromiseLike<TResult2>) | undefined | null): Promise<TResult1 | TResult2>;
-
-    /**
-     * Attaches a callback for only the rejection of the Promise.
-     * @param onrejected The callback to execute when the Promise is rejected.
-     * @returns A Promise for the completion of the callback.
-     */
-    catch<TResult = never>(onrejected?: ((reason: any) => TResult | PromiseLike<TResult>) | undefined | null): Promise<T | TResult>;
-}
-
-interface ArrayLike<T> {
-    readonly length: number;
-    readonly [n: number]: T;
-}
-
-/**
- * Make all properties in T optional
- */
-type Partial<T> = {
-    [P in keyof T]?: T[P];
-};
-
-/**
- * Make all properties in T required
- */
-type Required<T> = {
-    [P in keyof T]-?: T[P];
-};
-
-/**
- * Make all properties in T readonly
- */
-type Readonly<T> = {
-    readonly [P in keyof T]: T[P];
-};
-
-/**
- * From T pick a set of properties K
- */
-type Pick<T, K extends keyof T> = {
-    [P in K]: T[P];
-};
-
-/**
- * Construct a type with a set of properties K of type T
- */
-type Record<K extends keyof any, T> = {
-    [P in K]: T;
-};
-
-/**
- * Exclude from T those types that are assignable to U
- */
-type Exclude<T, U> = T extends U ? never : T;
-
-/**
- * Extract from T those types that are assignable to U
- */
-type Extract<T, U> = T extends U ? T : never;
-
-/**
- * Exclude null and undefined from T
- */
-type NonNullable<T> = T extends null | undefined ? never : T;
-
-/**
- * Obtain the return type of a function type
- */
-type ReturnType<T extends (...args: any[]) => any> = T extends (...args: any[]) => infer R ? R : any;
-
-/**
- * Obtain the return type of a constructor function type
- */
-type InstanceType<T extends new (...args: any[]) => any> = T extends new (...args: any[]) => infer R ? R : any;
-
-/**
- * Marker for contextual 'this' type
- */
-interface ThisType<T> { }
-
-/**
-  * Represents a raw buffer of binary data, which is used to store data for the
-  * different typed arrays. ArrayBuffers cannot be read from or written to directly,
-  * but can be passed to a typed array or DataView Object to interpret the raw
-  * buffer as needed.
-  */
-interface ArrayBuffer {
-    /**
-      * Read-only. The length of the ArrayBuffer (in bytes).
-      */
-    readonly byteLength: number;
-
-    /**
-      * Returns a section of an ArrayBuffer.
-      */
-    slice(begin: number, end?: number): ArrayBuffer;
-}
-
-/**
- * Allowed ArrayBuffer types for the buffer of an ArrayBufferView and related Typed Arrays.
- */
-interface ArrayBufferTypes {
-    ArrayBuffer: ArrayBuffer;
-}
-type ArrayBufferLike = ArrayBufferTypes[keyof ArrayBufferTypes];
-
-interface ArrayBufferConstructor {
-    readonly prototype: ArrayBuffer;
-    new(byteLength: number): ArrayBuffer;
-    isView(arg: any): arg is ArrayBufferView;
-}
-declare const ArrayBuffer: ArrayBufferConstructor;
-
-interface ArrayBufferView {
-    /**
-      * The ArrayBuffer instance referenced by the array.
-      */
-    buffer: ArrayBufferLike;
-
-    /**
-      * The length in bytes of the array.
-      */
-    byteLength: number;
-
-    /**
-      * The offset in bytes of the array.
-      */
-    byteOffset: number;
-}
-
-interface DataView {
-    readonly buffer: ArrayBuffer;
-    readonly byteLength: number;
-    readonly byteOffset: number;
-    /**
-      * Gets the Float32 value at the specified byte offset from the start of the view. There is
-      * no alignment constraint; multi-byte values may be fetched from any offset.
-      * @param byteOffset The place in the buffer at which the value should be retrieved.
-      */
-    getFloat32(byteOffset: number, littleEndian?: boolean): number;
-
-    /**
-      * Gets the Float64 value at the specified byte offset from the start of the view. There is
-      * no alignment constraint; multi-byte values may be fetched from any offset.
-      * @param byteOffset The place in the buffer at which the value should be retrieved.
-      */
-    getFloat64(byteOffset: number, littleEndian?: boolean): number;
-
-    /**
-      * Gets the Int8 value at the specified byte offset from the start of the view. There is
-      * no alignment constraint; multi-byte values may be fetched from any offset.
-      * @param byteOffset The place in the buffer at which the value should be retrieved.
-      */
-    getInt8(byteOffset: number): number;
-
-    /**
-      * Gets the Int16 value at the specified byte offset from the start of the view. There is
-      * no alignment constraint; multi-byte values may be fetched from any offset.
-      * @param byteOffset The place in the buffer at which the value should be retrieved.
-      */
-    getInt16(byteOffset: number, littleEndian?: boolean): number;
-    /**
-      * Gets the Int32 value at the specified byte offset from the start of the view. There is
-      * no alignment constraint; multi-byte values may be fetched from any offset.
-      * @param byteOffset The place in the buffer at which the value should be retrieved.
-      */
-    getInt32(byteOffset: number, littleEndian?: boolean): number;
-
-    /**
-      * Gets the Uint8 value at the specified byte offset from the start of the view. There is
-      * no alignment constraint; multi-byte values may be fetched from any offset.
-      * @param byteOffset The place in the buffer at which the value should be retrieved.
-      */
-    getUint8(byteOffset: number): number;
-
-    /**
-      * Gets the Uint16 value at the specified byte offset from the start of the view. There is
-      * no alignment constraint; multi-byte values may be fetched from any offset.
-      * @param byteOffset The place in the buffer at which the value should be retrieved.
-      */
-    getUint16(byteOffset: number, littleEndian?: boolean): number;
-
-    /**
-      * Gets the Uint32 value at the specified byte offset from the start of the view. There is
-      * no alignment constraint; multi-byte values may be fetched from any offset.
-      * @param byteOffset The place in the buffer at which the value should be retrieved.
-      */
-    getUint32(byteOffset: number, littleEndian?: boolean): number;
-
-    /**
-      * Stores an Float32 value at the specified byte offset from the start of the view.
-      * @param byteOffset The place in the buffer at which the value should be set.
-      * @param value The value to set.
-      * @param littleEndian If false or undefined, a big-endian value should be written,
-      * otherwise a little-endian value should be written.
-      */
-    setFloat32(byteOffset: number, value: number, littleEndian?: boolean): void;
-
-    /**
-      * Stores an Float64 value at the specified byte offset from the start of the view.
-      * @param byteOffset The place in the buffer at which the value should be set.
-      * @param value The value to set.
-      * @param littleEndian If false or undefined, a big-endian value should be written,
-      * otherwise a little-endian value should be written.
-      */
-    setFloat64(byteOffset: number, value: number, littleEndian?: boolean): void;
-
-    /**
-      * Stores an Int8 value at the specified byte offset from the start of the view.
-      * @param byteOffset The place in the buffer at which the value should be set.
-      * @param value The value to set.
-      */
-    setInt8(byteOffset: number, value: number): void;
-
-    /**
-      * Stores an Int16 value at the specified byte offset from the start of the view.
-      * @param byteOffset The place in the buffer at which the value should be set.
-      * @param value The value to set.
-      * @param littleEndian If false or undefined, a big-endian value should be written,
-      * otherwise a little-endian value should be written.
-      */
-    setInt16(byteOffset: number, value: number, littleEndian?: boolean): void;
-
-    /**
-      * Stores an Int32 value at the specified byte offset from the start of the view.
-      * @param byteOffset The place in the buffer at which the value should be set.
-      * @param value The value to set.
-      * @param littleEndian If false or undefined, a big-endian value should be written,
-      * otherwise a little-endian value should be written.
-      */
-    setInt32(byteOffset: number, value: number, littleEndian?: boolean): void;
-
-    /**
-      * Stores an Uint8 value at the specified byte offset from the start of the view.
-      * @param byteOffset The place in the buffer at which the value should be set.
-      * @param value The value to set.
-      */
-    setUint8(byteOffset: number, value: number): void;
-
-    /**
-      * Stores an Uint16 value at the specified byte offset from the start of the view.
-      * @param byteOffset The place in the buffer at which the value should be set.
-      * @param value The value to set.
-      * @param littleEndian If false or undefined, a big-endian value should be written,
-      * otherwise a little-endian value should be written.
-      */
-    setUint16(byteOffset: number, value: number, littleEndian?: boolean): void;
-
-    /**
-      * Stores an Uint32 value at the specified byte offset from the start of the view.
-      * @param byteOffset The place in the buffer at which the value should be set.
-      * @param value The value to set.
-      * @param littleEndian If false or undefined, a big-endian value should be written,
-      * otherwise a little-endian value should be written.
-      */
-    setUint32(byteOffset: number, value: number, littleEndian?: boolean): void;
-}
-
-interface DataViewConstructor {
-    new(buffer: ArrayBufferLike, byteOffset?: number, byteLength?: number): DataView;
-}
-declare const DataView: DataViewConstructor;
-
-/**
-  * A typed array of 8-bit integer values. The contents are initialized to 0. If the requested
-  * number of bytes could not be allocated an exception is raised.
-  */
-interface Int8Array {
-    /**
-      * The size in bytes of each element in the array.
-      */
-    readonly BYTES_PER_ELEMENT: number;
-
-    /**
-      * The ArrayBuffer instance referenced by the array.
-      */
-    readonly buffer: ArrayBufferLike;
-
-    /**
-      * The length in bytes of the array.
-      */
-    readonly byteLength: number;
-
-    /**
-      * The offset in bytes of the array.
-      */
-    readonly byteOffset: number;
-
-    /**
-      * Returns the this object after copying a section of the array identified by start and end
-      * to the same array starting at position target
-      * @param target If target is negative, it is treated as length+target where length is the
-      * length of the array.
-      * @param start If start is negative, it is treated as length+start. If end is negative, it
-      * is treated as length+end.
-      * @param end If not specified, length of the this object is used as its default value.
-      */
-    copyWithin(target: number, start: number, end?: number): this;
-
-    /**
-      * Determines whether all the members of an array satisfy the specified test.
-      * @param callbackfn A function that accepts up to three arguments. The every method calls
-      * the callbackfn function for each element in array1 until the callbackfn returns false,
-      * or until the end of the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    every(callbackfn: (value: number, index: number, array: Int8Array) => boolean, thisArg?: any): boolean;
-
-    /**
-        * Returns the this object after filling the section identified by start and end with value
-        * @param value value to fill array section with
-        * @param start index to start filling the array at. If start is negative, it is treated as
-        * length+start where length is the length of the array.
-        * @param end index to stop filling the array at. If end is negative, it is treated as
-        * length+end.
-        */
-    fill(value: number, start?: number, end?: number): this;
-
-    /**
-      * Returns the elements of an array that meet the condition specified in a callback function.
-      * @param callbackfn A function that accepts up to three arguments. The filter method calls
-      * the callbackfn function one time for each element in the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    filter(callbackfn: (value: number, index: number, array: Int8Array) => any, thisArg?: any): Int8Array;
-
-    /**
-      * Returns the value of the first element in the array where predicate is true, and undefined
-      * otherwise.
-      * @param predicate find calls predicate once for each element of the array, in ascending
-      * order, until it finds one where predicate returns true. If such an element is found, find
-      * immediately returns that element value. Otherwise, find returns undefined.
-      * @param thisArg If provided, it will be used as the this value for each invocation of
-      * predicate. If it is not provided, undefined is used instead.
-      */
-    find(predicate: (value: number, index: number, obj: Int8Array) => boolean, thisArg?: any): number | undefined;
-
-    /**
-      * Returns the index of the first element in the array where predicate is true, and -1
-      * otherwise.
-      * @param predicate find calls predicate once for each element of the array, in ascending
-      * order, until it finds one where predicate returns true. If such an element is found,
-      * findIndex immediately returns that element index. Otherwise, findIndex returns -1.
-      * @param thisArg If provided, it will be used as the this value for each invocation of
-      * predicate. If it is not provided, undefined is used instead.
-      */
-    findIndex(predicate: (value: number, index: number, obj: Int8Array) => boolean, thisArg?: any): number;
-
-    /**
-      * Performs the specified action for each element in an array.
-      * @param callbackfn  A function that accepts up to three arguments. forEach calls the
-      * callbackfn function one time for each element in the array.
-      * @param thisArg  An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    forEach(callbackfn: (value: number, index: number, array: Int8Array) => void, thisArg?: any): void;
-
-    /**
-      * Returns the index of the first occurrence of a value in an array.
-      * @param searchElement The value to locate in the array.
-      * @param fromIndex The array index at which to begin the search. If fromIndex is omitted, the
-      *  search starts at index 0.
-      */
-    indexOf(searchElement: number, fromIndex?: number): number;
-
-    /**
-      * Adds all the elements of an array separated by the specified separator string.
-      * @param separator A string used to separate one element of an array from the next in the
-      * resulting String. If omitted, the array elements are separated with a comma.
-      */
-    join(separator?: string): string;
-
-    /**
-      * Returns the index of the last occurrence of a value in an array.
-      * @param searchElement The value to locate in the array.
-      * @param fromIndex The array index at which to begin the search. If fromIndex is omitted, the
-      * search starts at index 0.
-      */
-    lastIndexOf(searchElement: number, fromIndex?: number): number;
-
-    /**
-      * The length of the array.
-      */
-    readonly length: number;
-
-    /**
-      * Calls a defined callback function on each element of an array, and returns an array that
-      * contains the results.
-      * @param callbackfn A function that accepts up to three arguments. The map method calls the
-      * callbackfn function one time for each element in the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    map(callbackfn: (value: number, index: number, array: Int8Array) => number, thisArg?: any): Int8Array;
-
-    /**
-      * Calls the specified callback function for all the elements in an array. The return value of
-      * the callback function is the accumulated result, and is provided as an argument in the next
-      * call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduce method calls the
-      * callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduce(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Int8Array) => number): number;
-    reduce(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Int8Array) => number, initialValue: number): number;
-
-    /**
-      * Calls the specified callback function for all the elements in an array. The return value of
-      * the callback function is the accumulated result, and is provided as an argument in the next
-      * call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduce method calls the
-      * callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduce<U>(callbackfn: (previousValue: U, currentValue: number, currentIndex: number, array: Int8Array) => U, initialValue: U): U;
-
-    /**
-      * Calls the specified callback function for all the elements in an array, in descending order.
-      * The return value of the callback function is the accumulated result, and is provided as an
-      * argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduceRight method calls
-      * the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an
-      * argument instead of an array value.
-      */
-    reduceRight(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Int8Array) => number): number;
-    reduceRight(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Int8Array) => number, initialValue: number): number;
-
-    /**
-      * Calls the specified callback function for all the elements in an array, in descending order.
-      * The return value of the callback function is the accumulated result, and is provided as an
-      * argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduceRight method calls
-      * the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduceRight<U>(callbackfn: (previousValue: U, currentValue: number, currentIndex: number, array: Int8Array) => U, initialValue: U): U;
-
-    /**
-      * Reverses the elements in an Array.
-      */
-    reverse(): Int8Array;
-
-    /**
-      * Sets a value or an array of values.
-      * @param array A typed or untyped array of values to set.
-      * @param offset The index in the current array at which the values are to be written.
-      */
-    set(array: ArrayLike<number>, offset?: number): void;
-
-    /**
-      * Returns a section of an array.
-      * @param start The beginning of the specified portion of the array.
-      * @param end The end of the specified portion of the array.
-      */
-    slice(start?: number, end?: number): Int8Array;
-
-    /**
-      * Determines whether the specified callback function returns true for any element of an array.
-      * @param callbackfn A function that accepts up to three arguments. The some method calls the
-      * callbackfn function for each element in array1 until the callbackfn returns true, or until
-      * the end of the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    some(callbackfn: (value: number, index: number, array: Int8Array) => boolean, thisArg?: any): boolean;
-
-    /**
-      * Sorts an array.
-      * @param compareFn The name of the function used to determine the order of the elements. If
-      * omitted, the elements are sorted in ascending, ASCII character order.
-      */
-    sort(compareFn?: (a: number, b: number) => number): this;
-
-    /**
-      * Gets a new Int8Array view of the ArrayBuffer store for this array, referencing the elements
-      * at begin, inclusive, up to end, exclusive.
-      * @param begin The index of the beginning of the array.
-      * @param end The index of the end of the array.
-      */
-    subarray(begin: number, end?: number): Int8Array;
-
-    /**
-      * Converts a number to a string by using the current locale.
-      */
-    toLocaleString(): string;
-
-    /**
-      * Returns a string representation of an array.
-      */
-    toString(): string;
-
-    [index: number]: number;
-}
-interface Int8ArrayConstructor {
-    readonly prototype: Int8Array;
-    new(length: number): Int8Array;
-    new(arrayOrArrayBuffer: ArrayLike<number> | ArrayBufferLike): Int8Array;
-    new(buffer: ArrayBufferLike, byteOffset: number, length?: number): Int8Array;
-
-    /**
-      * The size in bytes of each element in the array.
-      */
-    readonly BYTES_PER_ELEMENT: number;
-
-    /**
-      * Returns a new array from a set of elements.
-      * @param items A set of elements to include in the new array object.
-      */
-    of(...items: number[]): Int8Array;
-
-    /**
-      * Creates an array from an array-like or iterable object.
-      * @param arrayLike An array-like or iterable object to convert to an array.
-      * @param mapfn A mapping function to call on every element of the array.
-      * @param thisArg Value of 'this' used to invoke the mapfn.
-      */
-    from(arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int8Array;
-
-
-}
-declare const Int8Array: Int8ArrayConstructor;
-
-/**
-  * A typed array of 8-bit unsigned integer values. The contents are initialized to 0. If the
-  * requested number of bytes could not be allocated an exception is raised.
-  */
-interface Uint8Array {
-    /**
-      * The size in bytes of each element in the array.
-      */
-    readonly BYTES_PER_ELEMENT: number;
-
-    /**
-      * The ArrayBuffer instance referenced by the array.
-      */
-    readonly buffer: ArrayBufferLike;
-
-    /**
-      * The length in bytes of the array.
-      */
-    readonly byteLength: number;
-
-    /**
-      * The offset in bytes of the array.
-      */
-    readonly byteOffset: number;
-
-    /**
-      * Returns the this object after copying a section of the array identified by start and end
-      * to the same array starting at position target
-      * @param target If target is negative, it is treated as length+target where length is the
-      * length of the array.
-      * @param start If start is negative, it is treated as length+start. If end is negative, it
-      * is treated as length+end.
-      * @param end If not specified, length of the this object is used as its default value.
-      */
-    copyWithin(target: number, start: number, end?: number): this;
-
-    /**
-      * Determines whether all the members of an array satisfy the specified test.
-      * @param callbackfn A function that accepts up to three arguments. The every method calls
-      * the callbackfn function for each element in array1 until the callbackfn returns false,
-      * or until the end of the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    every(callbackfn: (value: number, index: number, array: Uint8Array) => boolean, thisArg?: any): boolean;
-
-    /**
-        * Returns the this object after filling the section identified by start and end with value
-        * @param value value to fill array section with
-        * @param start index to start filling the array at. If start is negative, it is treated as
-        * length+start where length is the length of the array.
-        * @param end index to stop filling the array at. If end is negative, it is treated as
-        * length+end.
-        */
-    fill(value: number, start?: number, end?: number): this;
-
-    /**
-      * Returns the elements of an array that meet the condition specified in a callback function.
-      * @param callbackfn A function that accepts up to three arguments. The filter method calls
-      * the callbackfn function one time for each element in the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    filter(callbackfn: (value: number, index: number, array: Uint8Array) => any, thisArg?: any): Uint8Array;
-
-    /**
-      * Returns the value of the first element in the array where predicate is true, and undefined
-      * otherwise.
-      * @param predicate find calls predicate once for each element of the array, in ascending
-      * order, until it finds one where predicate returns true. If such an element is found, find
-      * immediately returns that element value. Otherwise, find returns undefined.
-      * @param thisArg If provided, it will be used as the this value for each invocation of
-      * predicate. If it is not provided, undefined is used instead.
-      */
-    find(predicate: (value: number, index: number, obj: Uint8Array) => boolean, thisArg?: any): number | undefined;
-
-    /**
-      * Returns the index of the first element in the array where predicate is true, and -1
-      * otherwise.
-      * @param predicate find calls predicate once for each element of the array, in ascending
-      * order, until it finds one where predicate returns true. If such an element is found,
-      * findIndex immediately returns that element index. Otherwise, findIndex returns -1.
-      * @param thisArg If provided, it will be used as the this value for each invocation of
-      * predicate. If it is not provided, undefined is used instead.
-      */
-    findIndex(predicate: (value: number, index: number, obj: Uint8Array) => boolean, thisArg?: any): number;
-
-    /**
-      * Performs the specified action for each element in an array.
-      * @param callbackfn  A function that accepts up to three arguments. forEach calls the
-      * callbackfn function one time for each element in the array.
-      * @param thisArg  An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    forEach(callbackfn: (value: number, index: number, array: Uint8Array) => void, thisArg?: any): void;
-
-    /**
-      * Returns the index of the first occurrence of a value in an array.
-      * @param searchElement The value to locate in the array.
-      * @param fromIndex The array index at which to begin the search. If fromIndex is omitted, the
-      *  search starts at index 0.
-      */
-    indexOf(searchElement: number, fromIndex?: number): number;
-
-    /**
-      * Adds all the elements of an array separated by the specified separator string.
-      * @param separator A string used to separate one element of an array from the next in the
-      * resulting String. If omitted, the array elements are separated with a comma.
-      */
-    join(separator?: string): string;
-
-    /**
-      * Returns the index of the last occurrence of a value in an array.
-      * @param searchElement The value to locate in the array.
-      * @param fromIndex The array index at which to begin the search. If fromIndex is omitted, the
-      * search starts at index 0.
-      */
-    lastIndexOf(searchElement: number, fromIndex?: number): number;
-
-    /**
-      * The length of the array.
-      */
-    readonly length: number;
-
-    /**
-      * Calls a defined callback function on each element of an array, and returns an array that
-      * contains the results.
-      * @param callbackfn A function that accepts up to three arguments. The map method calls the
-      * callbackfn function one time for each element in the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    map(callbackfn: (value: number, index: number, array: Uint8Array) => number, thisArg?: any): Uint8Array;
-
-    /**
-      * Calls the specified callback function for all the elements in an array. The return value of
-      * the callback function is the accumulated result, and is provided as an argument in the next
-      * call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduce method calls the
-      * callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduce(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Uint8Array) => number): number;
-    reduce(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Uint8Array) => number, initialValue: number): number;
-
-    /**
-      * Calls the specified callback function for all the elements in an array. The return value of
-      * the callback function is the accumulated result, and is provided as an argument in the next
-      * call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduce method calls the
-      * callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduce<U>(callbackfn: (previousValue: U, currentValue: number, currentIndex: number, array: Uint8Array) => U, initialValue: U): U;
-
-    /**
-      * Calls the specified callback function for all the elements in an array, in descending order.
-      * The return value of the callback function is the accumulated result, and is provided as an
-      * argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduceRight method calls
-      * the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an
-      * argument instead of an array value.
-      */
-    reduceRight(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Uint8Array) => number): number;
-    reduceRight(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Uint8Array) => number, initialValue: number): number;
-
-    /**
-      * Calls the specified callback function for all the elements in an array, in descending order.
-      * The return value of the callback function is the accumulated result, and is provided as an
-      * argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduceRight method calls
-      * the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduceRight<U>(callbackfn: (previousValue: U, currentValue: number, currentIndex: number, array: Uint8Array) => U, initialValue: U): U;
-
-    /**
-      * Reverses the elements in an Array.
-      */
-    reverse(): Uint8Array;
-
-    /**
-      * Sets a value or an array of values.
-      * @param array A typed or untyped array of values to set.
-      * @param offset The index in the current array at which the values are to be written.
-      */
-    set(array: ArrayLike<number>, offset?: number): void;
-
-    /**
-      * Returns a section of an array.
-      * @param start The beginning of the specified portion of the array.
-      * @param end The end of the specified portion of the array.
-      */
-    slice(start?: number, end?: number): Uint8Array;
-
-    /**
-      * Determines whether the specified callback function returns true for any element of an array.
-      * @param callbackfn A function that accepts up to three arguments. The some method calls the
-      * callbackfn function for each element in array1 until the callbackfn returns true, or until
-      * the end of the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    some(callbackfn: (value: number, index: number, array: Uint8Array) => boolean, thisArg?: any): boolean;
-
-    /**
-      * Sorts an array.
-      * @param compareFn The name of the function used to determine the order of the elements. If
-      * omitted, the elements are sorted in ascending, ASCII character order.
-      */
-    sort(compareFn?: (a: number, b: number) => number): this;
-
-    /**
-      * Gets a new Uint8Array view of the ArrayBuffer store for this array, referencing the elements
-      * at begin, inclusive, up to end, exclusive.
-      * @param begin The index of the beginning of the array.
-      * @param end The index of the end of the array.
-      */
-    subarray(begin: number, end?: number): Uint8Array;
-
-    /**
-      * Converts a number to a string by using the current locale.
-      */
-    toLocaleString(): string;
-
-    /**
-      * Returns a string representation of an array.
-      */
-    toString(): string;
-
-    [index: number]: number;
-}
-
-interface Uint8ArrayConstructor {
-    readonly prototype: Uint8Array;
-    new(length: number): Uint8Array;
-    new(arrayOrArrayBuffer: ArrayLike<number> | ArrayBufferLike): Uint8Array;
-    new(buffer: ArrayBufferLike, byteOffset: number, length?: number): Uint8Array;
-
-    /**
-      * The size in bytes of each element in the array.
-      */
-    readonly BYTES_PER_ELEMENT: number;
-
-    /**
-      * Returns a new array from a set of elements.
-      * @param items A set of elements to include in the new array object.
-      */
-    of(...items: number[]): Uint8Array;
-
-    /**
-      * Creates an array from an array-like or iterable object.
-      * @param arrayLike An array-like or iterable object to convert to an array.
-      * @param mapfn A mapping function to call on every element of the array.
-      * @param thisArg Value of 'this' used to invoke the mapfn.
-      */
-    from(arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint8Array;
-
-}
-declare const Uint8Array: Uint8ArrayConstructor;
-
-/**
-  * A typed array of 8-bit unsigned integer (clamped) values. The contents are initialized to 0.
-  * If the requested number of bytes could not be allocated an exception is raised.
-  */
-interface Uint8ClampedArray {
-    /**
-      * The size in bytes of each element in the array.
-      */
-    readonly BYTES_PER_ELEMENT: number;
-
-    /**
-      * The ArrayBuffer instance referenced by the array.
-      */
-    readonly buffer: ArrayBufferLike;
-
-    /**
-      * The length in bytes of the array.
-      */
-    readonly byteLength: number;
-
-    /**
-      * The offset in bytes of the array.
-      */
-    readonly byteOffset: number;
-
-    /**
-      * Returns the this object after copying a section of the array identified by start and end
-      * to the same array starting at position target
-      * @param target If target is negative, it is treated as length+target where length is the
-      * length of the array.
-      * @param start If start is negative, it is treated as length+start. If end is negative, it
-      * is treated as length+end.
-      * @param end If not specified, length of the this object is used as its default value.
-      */
-    copyWithin(target: number, start: number, end?: number): this;
-
-    /**
-      * Determines whether all the members of an array satisfy the specified test.
-      * @param callbackfn A function that accepts up to three arguments. The every method calls
-      * the callbackfn function for each element in array1 until the callbackfn returns false,
-      * or until the end of the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    every(callbackfn: (value: number, index: number, array: Uint8ClampedArray) => boolean, thisArg?: any): boolean;
-
-    /**
-        * Returns the this object after filling the section identified by start and end with value
-        * @param value value to fill array section with
-        * @param start index to start filling the array at. If start is negative, it is treated as
-        * length+start where length is the length of the array.
-        * @param end index to stop filling the array at. If end is negative, it is treated as
-        * length+end.
-        */
-    fill(value: number, start?: number, end?: number): this;
-
-    /**
-      * Returns the elements of an array that meet the condition specified in a callback function.
-      * @param callbackfn A function that accepts up to three arguments. The filter method calls
-      * the callbackfn function one time for each element in the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    filter(callbackfn: (value: number, index: number, array: Uint8ClampedArray) => any, thisArg?: any): Uint8ClampedArray;
-
-    /**
-      * Returns the value of the first element in the array where predicate is true, and undefined
-      * otherwise.
-      * @param predicate find calls predicate once for each element of the array, in ascending
-      * order, until it finds one where predicate returns true. If such an element is found, find
-      * immediately returns that element value. Otherwise, find returns undefined.
-      * @param thisArg If provided, it will be used as the this value for each invocation of
-      * predicate. If it is not provided, undefined is used instead.
-      */
-    find(predicate: (value: number, index: number, obj: Uint8ClampedArray) => boolean, thisArg?: any): number | undefined;
-
-    /**
-      * Returns the index of the first element in the array where predicate is true, and -1
-      * otherwise.
-      * @param predicate find calls predicate once for each element of the array, in ascending
-      * order, until it finds one where predicate returns true. If such an element is found,
-      * findIndex immediately returns that element index. Otherwise, findIndex returns -1.
-      * @param thisArg If provided, it will be used as the this value for each invocation of
-      * predicate. If it is not provided, undefined is used instead.
-      */
-    findIndex(predicate: (value: number, index: number, obj: Uint8ClampedArray) => boolean, thisArg?: any): number;
-
-    /**
-      * Performs the specified action for each element in an array.
-      * @param callbackfn  A function that accepts up to three arguments. forEach calls the
-      * callbackfn function one time for each element in the array.
-      * @param thisArg  An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    forEach(callbackfn: (value: number, index: number, array: Uint8ClampedArray) => void, thisArg?: any): void;
-
-    /**
-      * Returns the index of the first occurrence of a value in an array.
-      * @param searchElement The value to locate in the array.
-      * @param fromIndex The array index at which to begin the search. If fromIndex is omitted, the
-      *  search starts at index 0.
-      */
-    indexOf(searchElement: number, fromIndex?: number): number;
-
-    /**
-      * Adds all the elements of an array separated by the specified separator string.
-      * @param separator A string used to separate one element of an array from the next in the
-      * resulting String. If omitted, the array elements are separated with a comma.
-      */
-    join(separator?: string): string;
-
-    /**
-      * Returns the index of the last occurrence of a value in an array.
-      * @param searchElement The value to locate in the array.
-      * @param fromIndex The array index at which to begin the search. If fromIndex is omitted, the
-      * search starts at index 0.
-      */
-    lastIndexOf(searchElement: number, fromIndex?: number): number;
-
-    /**
-      * The length of the array.
-      */
-    readonly length: number;
-
-    /**
-      * Calls a defined callback function on each element of an array, and returns an array that
-      * contains the results.
-      * @param callbackfn A function that accepts up to three arguments. The map method calls the
-      * callbackfn function one time for each element in the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    map(callbackfn: (value: number, index: number, array: Uint8ClampedArray) => number, thisArg?: any): Uint8ClampedArray;
-
-    /**
-      * Calls the specified callback function for all the elements in an array. The return value of
-      * the callback function is the accumulated result, and is provided as an argument in the next
-      * call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduce method calls the
-      * callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduce(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Uint8ClampedArray) => number): number;
-    reduce(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Uint8ClampedArray) => number, initialValue: number): number;
-
-    /**
-      * Calls the specified callback function for all the elements in an array. The return value of
-      * the callback function is the accumulated result, and is provided as an argument in the next
-      * call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduce method calls the
-      * callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduce<U>(callbackfn: (previousValue: U, currentValue: number, currentIndex: number, array: Uint8ClampedArray) => U, initialValue: U): U;
-
-    /**
-      * Calls the specified callback function for all the elements in an array, in descending order.
-      * The return value of the callback function is the accumulated result, and is provided as an
-      * argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduceRight method calls
-      * the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an
-      * argument instead of an array value.
-      */
-    reduceRight(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Uint8ClampedArray) => number): number;
-    reduceRight(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Uint8ClampedArray) => number, initialValue: number): number;
-
-    /**
-      * Calls the specified callback function for all the elements in an array, in descending order.
-      * The return value of the callback function is the accumulated result, and is provided as an
-      * argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduceRight method calls
-      * the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduceRight<U>(callbackfn: (previousValue: U, currentValue: number, currentIndex: number, array: Uint8ClampedArray) => U, initialValue: U): U;
-
-    /**
-      * Reverses the elements in an Array.
-      */
-    reverse(): Uint8ClampedArray;
-
-    /**
-      * Sets a value or an array of values.
-      * @param array A typed or untyped array of values to set.
-      * @param offset The index in the current array at which the values are to be written.
-      */
-    set(array: ArrayLike<number>, offset?: number): void;
-
-    /**
-      * Returns a section of an array.
-      * @param start The beginning of the specified portion of the array.
-      * @param end The end of the specified portion of the array.
-      */
-    slice(start?: number, end?: number): Uint8ClampedArray;
-
-    /**
-      * Determines whether the specified callback function returns true for any element of an array.
-      * @param callbackfn A function that accepts up to three arguments. The some method calls the
-      * callbackfn function for each element in array1 until the callbackfn returns true, or until
-      * the end of the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    some(callbackfn: (value: number, index: number, array: Uint8ClampedArray) => boolean, thisArg?: any): boolean;
-
-    /**
-      * Sorts an array.
-      * @param compareFn The name of the function used to determine the order of the elements. If
-      * omitted, the elements are sorted in ascending, ASCII character order.
-      */
-    sort(compareFn?: (a: number, b: number) => number): this;
-
-    /**
-      * Gets a new Uint8ClampedArray view of the ArrayBuffer store for this array, referencing the elements
-      * at begin, inclusive, up to end, exclusive.
-      * @param begin The index of the beginning of the array.
-      * @param end The index of the end of the array.
-      */
-    subarray(begin: number, end?: number): Uint8ClampedArray;
-
-    /**
-      * Converts a number to a string by using the current locale.
-      */
-    toLocaleString(): string;
-
-    /**
-      * Returns a string representation of an array.
-      */
-    toString(): string;
-
-    [index: number]: number;
-}
-
-interface Uint8ClampedArrayConstructor {
-    readonly prototype: Uint8ClampedArray;
-    new(length: number): Uint8ClampedArray;
-    new(arrayOrArrayBuffer: ArrayLike<number> | ArrayBufferLike): Uint8ClampedArray;
-    new(buffer: ArrayBufferLike, byteOffset: number, length?: number): Uint8ClampedArray;
-
-    /**
-      * The size in bytes of each element in the array.
-      */
-    readonly BYTES_PER_ELEMENT: number;
-
-    /**
-      * Returns a new array from a set of elements.
-      * @param items A set of elements to include in the new array object.
-      */
-    of(...items: number[]): Uint8ClampedArray;
-
-    /**
-      * Creates an array from an array-like or iterable object.
-      * @param arrayLike An array-like or iterable object to convert to an array.
-      * @param mapfn A mapping function to call on every element of the array.
-      * @param thisArg Value of 'this' used to invoke the mapfn.
-      */
-    from(arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint8ClampedArray;
-}
-declare const Uint8ClampedArray: Uint8ClampedArrayConstructor;
-
-/**
-  * A typed array of 16-bit signed integer values. The contents are initialized to 0. If the
-  * requested number of bytes could not be allocated an exception is raised.
-  */
-interface Int16Array {
-    /**
-      * The size in bytes of each element in the array.
-      */
-    readonly BYTES_PER_ELEMENT: number;
-
-    /**
-      * The ArrayBuffer instance referenced by the array.
-      */
-    readonly buffer: ArrayBufferLike;
-
-    /**
-      * The length in bytes of the array.
-      */
-    readonly byteLength: number;
-
-    /**
-      * The offset in bytes of the array.
-      */
-    readonly byteOffset: number;
-
-    /**
-      * Returns the this object after copying a section of the array identified by start and end
-      * to the same array starting at position target
-      * @param target If target is negative, it is treated as length+target where length is the
-      * length of the array.
-      * @param start If start is negative, it is treated as length+start. If end is negative, it
-      * is treated as length+end.
-      * @param end If not specified, length of the this object is used as its default value.
-      */
-    copyWithin(target: number, start: number, end?: number): this;
-
-    /**
-      * Determines whether all the members of an array satisfy the specified test.
-      * @param callbackfn A function that accepts up to three arguments. The every method calls
-      * the callbackfn function for each element in array1 until the callbackfn returns false,
-      * or until the end of the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    every(callbackfn: (value: number, index: number, array: Int16Array) => boolean, thisArg?: any): boolean;
-
-    /**
-        * Returns the this object after filling the section identified by start and end with value
-        * @param value value to fill array section with
-        * @param start index to start filling the array at. If start is negative, it is treated as
-        * length+start where length is the length of the array.
-        * @param end index to stop filling the array at. If end is negative, it is treated as
-        * length+end.
-        */
-    fill(value: number, start?: number, end?: number): this;
-
-    /**
-      * Returns the elements of an array that meet the condition specified in a callback function.
-      * @param callbackfn A function that accepts up to three arguments. The filter method calls
-      * the callbackfn function one time for each element in the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    filter(callbackfn: (value: number, index: number, array: Int16Array) => any, thisArg?: any): Int16Array;
-
-    /**
-      * Returns the value of the first element in the array where predicate is true, and undefined
-      * otherwise.
-      * @param predicate find calls predicate once for each element of the array, in ascending
-      * order, until it finds one where predicate returns true. If such an element is found, find
-      * immediately returns that element value. Otherwise, find returns undefined.
-      * @param thisArg If provided, it will be used as the this value for each invocation of
-      * predicate. If it is not provided, undefined is used instead.
-      */
-    find(predicate: (value: number, index: number, obj: Int16Array) => boolean, thisArg?: any): number | undefined;
-
-    /**
-      * Returns the index of the first element in the array where predicate is true, and -1
-      * otherwise.
-      * @param predicate find calls predicate once for each element of the array, in ascending
-      * order, until it finds one where predicate returns true. If such an element is found,
-      * findIndex immediately returns that element index. Otherwise, findIndex returns -1.
-      * @param thisArg If provided, it will be used as the this value for each invocation of
-      * predicate. If it is not provided, undefined is used instead.
-      */
-    findIndex(predicate: (value: number, index: number, obj: Int16Array) => boolean, thisArg?: any): number;
-
-    /**
-      * Performs the specified action for each element in an array.
-      * @param callbackfn  A function that accepts up to three arguments. forEach calls the
-      * callbackfn function one time for each element in the array.
-      * @param thisArg  An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    forEach(callbackfn: (value: number, index: number, array: Int16Array) => void, thisArg?: any): void;
-    /**
-      * Returns the index of the first occurrence of a value in an array.
-      * @param searchElement The value to locate in the array.
-      * @param fromIndex The array index at which to begin the search. If fromIndex is omitted, the
-      *  search starts at index 0.
-      */
-    indexOf(searchElement: number, fromIndex?: number): number;
-
-    /**
-      * Adds all the elements of an array separated by the specified separator string.
-      * @param separator A string used to separate one element of an array from the next in the
-      * resulting String. If omitted, the array elements are separated with a comma.
-      */
-    join(separator?: string): string;
-
-    /**
-      * Returns the index of the last occurrence of a value in an array.
-      * @param searchElement The value to locate in the array.
-      * @param fromIndex The array index at which to begin the search. If fromIndex is omitted, the
-      * search starts at index 0.
-      */
-    lastIndexOf(searchElement: number, fromIndex?: number): number;
-
-    /**
-      * The length of the array.
-      */
-    readonly length: number;
-
-    /**
-      * Calls a defined callback function on each element of an array, and returns an array that
-      * contains the results.
-      * @param callbackfn A function that accepts up to three arguments. The map method calls the
-      * callbackfn function one time for each element in the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    map(callbackfn: (value: number, index: number, array: Int16Array) => number, thisArg?: any): Int16Array;
-
-    /**
-      * Calls the specified callback function for all the elements in an array. The return value of
-      * the callback function is the accumulated result, and is provided as an argument in the next
-      * call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduce method calls the
-      * callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduce(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Int16Array) => number): number;
-    reduce(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Int16Array) => number, initialValue: number): number;
-
-    /**
-      * Calls the specified callback function for all the elements in an array. The return value of
-      * the callback function is the accumulated result, and is provided as an argument in the next
-      * call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduce method calls the
-      * callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduce<U>(callbackfn: (previousValue: U, currentValue: number, currentIndex: number, array: Int16Array) => U, initialValue: U): U;
-
-    /**
-      * Calls the specified callback function for all the elements in an array, in descending order.
-      * The return value of the callback function is the accumulated result, and is provided as an
-      * argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduceRight method calls
-      * the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an
-      * argument instead of an array value.
-      */
-    reduceRight(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Int16Array) => number): number;
-    reduceRight(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Int16Array) => number, initialValue: number): number;
-
-    /**
-      * Calls the specified callback function for all the elements in an array, in descending order.
-      * The return value of the callback function is the accumulated result, and is provided as an
-      * argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduceRight method calls
-      * the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduceRight<U>(callbackfn: (previousValue: U, currentValue: number, currentIndex: number, array: Int16Array) => U, initialValue: U): U;
-
-    /**
-      * Reverses the elements in an Array.
-      */
-    reverse(): Int16Array;
-
-    /**
-      * Sets a value or an array of values.
-      * @param array A typed or untyped array of values to set.
-      * @param offset The index in the current array at which the values are to be written.
-      */
-    set(array: ArrayLike<number>, offset?: number): void;
-
-    /**
-      * Returns a section of an array.
-      * @param start The beginning of the specified portion of the array.
-      * @param end The end of the specified portion of the array.
-      */
-    slice(start?: number, end?: number): Int16Array;
-
-    /**
-      * Determines whether the specified callback function returns true for any element of an array.
-      * @param callbackfn A function that accepts up to three arguments. The some method calls the
-      * callbackfn function for each element in array1 until the callbackfn returns true, or until
-      * the end of the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    some(callbackfn: (value: number, index: number, array: Int16Array) => boolean, thisArg?: any): boolean;
-
-    /**
-      * Sorts an array.
-      * @param compareFn The name of the function used to determine the order of the elements. If
-      * omitted, the elements are sorted in ascending, ASCII character order.
-      */
-    sort(compareFn?: (a: number, b: number) => number): this;
-
-    /**
-      * Gets a new Int16Array view of the ArrayBuffer store for this array, referencing the elements
-      * at begin, inclusive, up to end, exclusive.
-      * @param begin The index of the beginning of the array.
-      * @param end The index of the end of the array.
-      */
-    subarray(begin: number, end?: number): Int16Array;
-
-    /**
-      * Converts a number to a string by using the current locale.
-      */
-    toLocaleString(): string;
-
-    /**
-      * Returns a string representation of an array.
-      */
-    toString(): string;
-
-    [index: number]: number;
-}
-
-interface Int16ArrayConstructor {
-    readonly prototype: Int16Array;
-    new(length: number): Int16Array;
-    new(arrayOrArrayBuffer: ArrayLike<number> | ArrayBufferLike): Int16Array;
-    new(buffer: ArrayBufferLike, byteOffset: number, length?: number): Int16Array;
-
-    /**
-      * The size in bytes of each element in the array.
-      */
-    readonly BYTES_PER_ELEMENT: number;
-
-    /**
-      * Returns a new array from a set of elements.
-      * @param items A set of elements to include in the new array object.
-      */
-    of(...items: number[]): Int16Array;
-
-    /**
-      * Creates an array from an array-like or iterable object.
-      * @param arrayLike An array-like or iterable object to convert to an array.
-      * @param mapfn A mapping function to call on every element of the array.
-      * @param thisArg Value of 'this' used to invoke the mapfn.
-      */
-    from(arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int16Array;
-
-
-}
-declare const Int16Array: Int16ArrayConstructor;
-
-/**
-  * A typed array of 16-bit unsigned integer values. The contents are initialized to 0. If the
-  * requested number of bytes could not be allocated an exception is raised.
-  */
-interface Uint16Array {
-    /**
-      * The size in bytes of each element in the array.
-      */
-    readonly BYTES_PER_ELEMENT: number;
-
-    /**
-      * The ArrayBuffer instance referenced by the array.
-      */
-    readonly buffer: ArrayBufferLike;
-
-    /**
-      * The length in bytes of the array.
-      */
-    readonly byteLength: number;
-
-    /**
-      * The offset in bytes of the array.
-      */
-    readonly byteOffset: number;
-
-    /**
-      * Returns the this object after copying a section of the array identified by start and end
-      * to the same array starting at position target
-      * @param target If target is negative, it is treated as length+target where length is the
-      * length of the array.
-      * @param start If start is negative, it is treated as length+start. If end is negative, it
-      * is treated as length+end.
-      * @param end If not specified, length of the this object is used as its default value.
-      */
-    copyWithin(target: number, start: number, end?: number): this;
-
-    /**
-      * Determines whether all the members of an array satisfy the specified test.
-      * @param callbackfn A function that accepts up to three arguments. The every method calls
-      * the callbackfn function for each element in array1 until the callbackfn returns false,
-      * or until the end of the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    every(callbackfn: (value: number, index: number, array: Uint16Array) => boolean, thisArg?: any): boolean;
-
-    /**
-        * Returns the this object after filling the section identified by start and end with value
-        * @param value value to fill array section with
-        * @param start index to start filling the array at. If start is negative, it is treated as
-        * length+start where length is the length of the array.
-        * @param end index to stop filling the array at. If end is negative, it is treated as
-        * length+end.
-        */
-    fill(value: number, start?: number, end?: number): this;
-
-    /**
-      * Returns the elements of an array that meet the condition specified in a callback function.
-      * @param callbackfn A function that accepts up to three arguments. The filter method calls
-      * the callbackfn function one time for each element in the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    filter(callbackfn: (value: number, index: number, array: Uint16Array) => any, thisArg?: any): Uint16Array;
-
-    /**
-      * Returns the value of the first element in the array where predicate is true, and undefined
-      * otherwise.
-      * @param predicate find calls predicate once for each element of the array, in ascending
-      * order, until it finds one where predicate returns true. If such an element is found, find
-      * immediately returns that element value. Otherwise, find returns undefined.
-      * @param thisArg If provided, it will be used as the this value for each invocation of
-      * predicate. If it is not provided, undefined is used instead.
-      */
-    find(predicate: (value: number, index: number, obj: Uint16Array) => boolean, thisArg?: any): number | undefined;
-
-    /**
-      * Returns the index of the first element in the array where predicate is true, and -1
-      * otherwise.
-      * @param predicate find calls predicate once for each element of the array, in ascending
-      * order, until it finds one where predicate returns true. If such an element is found,
-      * findIndex immediately returns that element index. Otherwise, findIndex returns -1.
-      * @param thisArg If provided, it will be used as the this value for each invocation of
-      * predicate. If it is not provided, undefined is used instead.
-      */
-    findIndex(predicate: (value: number, index: number, obj: Uint16Array) => boolean, thisArg?: any): number;
-
-    /**
-      * Performs the specified action for each element in an array.
-      * @param callbackfn  A function that accepts up to three arguments. forEach calls the
-      * callbackfn function one time for each element in the array.
-      * @param thisArg  An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    forEach(callbackfn: (value: number, index: number, array: Uint16Array) => void, thisArg?: any): void;
-
-    /**
-      * Returns the index of the first occurrence of a value in an array.
-      * @param searchElement The value to locate in the array.
-      * @param fromIndex The array index at which to begin the search. If fromIndex is omitted, the
-      *  search starts at index 0.
-      */
-    indexOf(searchElement: number, fromIndex?: number): number;
-
-    /**
-      * Adds all the elements of an array separated by the specified separator string.
-      * @param separator A string used to separate one element of an array from the next in the
-      * resulting String. If omitted, the array elements are separated with a comma.
-      */
-    join(separator?: string): string;
-
-    /**
-      * Returns the index of the last occurrence of a value in an array.
-      * @param searchElement The value to locate in the array.
-      * @param fromIndex The array index at which to begin the search. If fromIndex is omitted, the
-      * search starts at index 0.
-      */
-    lastIndexOf(searchElement: number, fromIndex?: number): number;
-
-    /**
-      * The length of the array.
-      */
-    readonly length: number;
-
-    /**
-      * Calls a defined callback function on each element of an array, and returns an array that
-      * contains the results.
-      * @param callbackfn A function that accepts up to three arguments. The map method calls the
-      * callbackfn function one time for each element in the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    map(callbackfn: (value: number, index: number, array: Uint16Array) => number, thisArg?: any): Uint16Array;
-
-    /**
-      * Calls the specified callback function for all the elements in an array. The return value of
-      * the callback function is the accumulated result, and is provided as an argument in the next
-      * call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduce method calls the
-      * callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduce(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Uint16Array) => number): number;
-    reduce(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Uint16Array) => number, initialValue: number): number;
-
-    /**
-      * Calls the specified callback function for all the elements in an array. The return value of
-      * the callback function is the accumulated result, and is provided as an argument in the next
-      * call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduce method calls the
-      * callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduce<U>(callbackfn: (previousValue: U, currentValue: number, currentIndex: number, array: Uint16Array) => U, initialValue: U): U;
-
-    /**
-      * Calls the specified callback function for all the elements in an array, in descending order.
-      * The return value of the callback function is the accumulated result, and is provided as an
-      * argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduceRight method calls
-      * the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an
-      * argument instead of an array value.
-      */
-    reduceRight(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Uint16Array) => number): number;
-    reduceRight(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Uint16Array) => number, initialValue: number): number;
-
-    /**
-      * Calls the specified callback function for all the elements in an array, in descending order.
-      * The return value of the callback function is the accumulated result, and is provided as an
-      * argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduceRight method calls
-      * the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduceRight<U>(callbackfn: (previousValue: U, currentValue: number, currentIndex: number, array: Uint16Array) => U, initialValue: U): U;
-
-    /**
-      * Reverses the elements in an Array.
-      */
-    reverse(): Uint16Array;
-
-    /**
-      * Sets a value or an array of values.
-      * @param array A typed or untyped array of values to set.
-      * @param offset The index in the current array at which the values are to be written.
-      */
-    set(array: ArrayLike<number>, offset?: number): void;
-
-    /**
-      * Returns a section of an array.
-      * @param start The beginning of the specified portion of the array.
-      * @param end The end of the specified portion of the array.
-      */
-    slice(start?: number, end?: number): Uint16Array;
-
-    /**
-      * Determines whether the specified callback function returns true for any element of an array.
-      * @param callbackfn A function that accepts up to three arguments. The some method calls the
-      * callbackfn function for each element in array1 until the callbackfn returns true, or until
-      * the end of the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    some(callbackfn: (value: number, index: number, array: Uint16Array) => boolean, thisArg?: any): boolean;
-
-    /**
-      * Sorts an array.
-      * @param compareFn The name of the function used to determine the order of the elements. If
-      * omitted, the elements are sorted in ascending, ASCII character order.
-      */
-    sort(compareFn?: (a: number, b: number) => number): this;
-
-    /**
-      * Gets a new Uint16Array view of the ArrayBuffer store for this array, referencing the elements
-      * at begin, inclusive, up to end, exclusive.
-      * @param begin The index of the beginning of the array.
-      * @param end The index of the end of the array.
-      */
-    subarray(begin: number, end?: number): Uint16Array;
-
-    /**
-      * Converts a number to a string by using the current locale.
-      */
-    toLocaleString(): string;
-
-    /**
-      * Returns a string representation of an array.
-      */
-    toString(): string;
-
-    [index: number]: number;
-}
-
-interface Uint16ArrayConstructor {
-    readonly prototype: Uint16Array;
-    new(length: number): Uint16Array;
-    new(arrayOrArrayBuffer: ArrayLike<number> | ArrayBufferLike): Uint16Array;
-    new(buffer: ArrayBufferLike, byteOffset: number, length?: number): Uint16Array;
-
-    /**
-      * The size in bytes of each element in the array.
-      */
-    readonly BYTES_PER_ELEMENT: number;
-
-    /**
-      * Returns a new array from a set of elements.
-      * @param items A set of elements to include in the new array object.
-      */
-    of(...items: number[]): Uint16Array;
-
-    /**
-      * Creates an array from an array-like or iterable object.
-      * @param arrayLike An array-like or iterable object to convert to an array.
-      * @param mapfn A mapping function to call on every element of the array.
-      * @param thisArg Value of 'this' used to invoke the mapfn.
-      */
-    from(arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint16Array;
-
-
-}
-declare const Uint16Array: Uint16ArrayConstructor;
-/**
-  * A typed array of 32-bit signed integer values. The contents are initialized to 0. If the
-  * requested number of bytes could not be allocated an exception is raised.
-  */
-interface Int32Array {
-    /**
-      * The size in bytes of each element in the array.
-      */
-    readonly BYTES_PER_ELEMENT: number;
-
-    /**
-      * The ArrayBuffer instance referenced by the array.
-      */
-    readonly buffer: ArrayBufferLike;
-
-    /**
-      * The length in bytes of the array.
-      */
-    readonly byteLength: number;
-
-    /**
-      * The offset in bytes of the array.
-      */
-    readonly byteOffset: number;
-
-    /**
-      * Returns the this object after copying a section of the array identified by start and end
-      * to the same array starting at position target
-      * @param target If target is negative, it is treated as length+target where length is the
-      * length of the array.
-      * @param start If start is negative, it is treated as length+start. If end is negative, it
-      * is treated as length+end.
-      * @param end If not specified, length of the this object is used as its default value.
-      */
-    copyWithin(target: number, start: number, end?: number): this;
-
-    /**
-      * Determines whether all the members of an array satisfy the specified test.
-      * @param callbackfn A function that accepts up to three arguments. The every method calls
-      * the callbackfn function for each element in array1 until the callbackfn returns false,
-      * or until the end of the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    every(callbackfn: (value: number, index: number, array: Int32Array) => boolean, thisArg?: any): boolean;
-
-    /**
-        * Returns the this object after filling the section identified by start and end with value
-        * @param value value to fill array section with
-        * @param start index to start filling the array at. If start is negative, it is treated as
-        * length+start where length is the length of the array.
-        * @param end index to stop filling the array at. If end is negative, it is treated as
-        * length+end.
-        */
-    fill(value: number, start?: number, end?: number): this;
-
-    /**
-      * Returns the elements of an array that meet the condition specified in a callback function.
-      * @param callbackfn A function that accepts up to three arguments. The filter method calls
-      * the callbackfn function one time for each element in the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    filter(callbackfn: (value: number, index: number, array: Int32Array) => any, thisArg?: any): Int32Array;
-
-    /**
-      * Returns the value of the first element in the array where predicate is true, and undefined
-      * otherwise.
-      * @param predicate find calls predicate once for each element of the array, in ascending
-      * order, until it finds one where predicate returns true. If such an element is found, find
-      * immediately returns that element value. Otherwise, find returns undefined.
-      * @param thisArg If provided, it will be used as the this value for each invocation of
-      * predicate. If it is not provided, undefined is used instead.
-      */
-    find(predicate: (value: number, index: number, obj: Int32Array) => boolean, thisArg?: any): number | undefined;
-
-    /**
-      * Returns the index of the first element in the array where predicate is true, and -1
-      * otherwise.
-      * @param predicate find calls predicate once for each element of the array, in ascending
-      * order, until it finds one where predicate returns true. If such an element is found,
-      * findIndex immediately returns that element index. Otherwise, findIndex returns -1.
-      * @param thisArg If provided, it will be used as the this value for each invocation of
-      * predicate. If it is not provided, undefined is used instead.
-      */
-    findIndex(predicate: (value: number, index: number, obj: Int32Array) => boolean, thisArg?: any): number;
-
-    /**
-      * Performs the specified action for each element in an array.
-      * @param callbackfn  A function that accepts up to three arguments. forEach calls the
-      * callbackfn function one time for each element in the array.
-      * @param thisArg  An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    forEach(callbackfn: (value: number, index: number, array: Int32Array) => void, thisArg?: any): void;
-
-    /**
-      * Returns the index of the first occurrence of a value in an array.
-      * @param searchElement The value to locate in the array.
-      * @param fromIndex The array index at which to begin the search. If fromIndex is omitted, the
-      *  search starts at index 0.
-      */
-    indexOf(searchElement: number, fromIndex?: number): number;
-
-    /**
-      * Adds all the elements of an array separated by the specified separator string.
-      * @param separator A string used to separate one element of an array from the next in the
-      * resulting String. If omitted, the array elements are separated with a comma.
-      */
-    join(separator?: string): string;
-
-    /**
-      * Returns the index of the last occurrence of a value in an array.
-      * @param searchElement The value to locate in the array.
-      * @param fromIndex The array index at which to begin the search. If fromIndex is omitted, the
-      * search starts at index 0.
-      */
-    lastIndexOf(searchElement: number, fromIndex?: number): number;
-
-    /**
-      * The length of the array.
-      */
-    readonly length: number;
-
-    /**
-      * Calls a defined callback function on each element of an array, and returns an array that
-      * contains the results.
-      * @param callbackfn A function that accepts up to three arguments. The map method calls the
-      * callbackfn function one time for each element in the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    map(callbackfn: (value: number, index: number, array: Int32Array) => number, thisArg?: any): Int32Array;
-
-    /**
-      * Calls the specified callback function for all the elements in an array. The return value of
-      * the callback function is the accumulated result, and is provided as an argument in the next
-      * call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduce method calls the
-      * callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduce(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Int32Array) => number): number;
-    reduce(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Int32Array) => number, initialValue: number): number;
-
-    /**
-      * Calls the specified callback function for all the elements in an array. The return value of
-      * the callback function is the accumulated result, and is provided as an argument in the next
-      * call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduce method calls the
-      * callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduce<U>(callbackfn: (previousValue: U, currentValue: number, currentIndex: number, array: Int32Array) => U, initialValue: U): U;
-
-    /**
-      * Calls the specified callback function for all the elements in an array, in descending order.
-      * The return value of the callback function is the accumulated result, and is provided as an
-      * argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduceRight method calls
-      * the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an
-      * argument instead of an array value.
-      */
-    reduceRight(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Int32Array) => number): number;
-    reduceRight(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Int32Array) => number, initialValue: number): number;
-
-    /**
-      * Calls the specified callback function for all the elements in an array, in descending order.
-      * The return value of the callback function is the accumulated result, and is provided as an
-      * argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduceRight method calls
-      * the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduceRight<U>(callbackfn: (previousValue: U, currentValue: number, currentIndex: number, array: Int32Array) => U, initialValue: U): U;
-
-    /**
-      * Reverses the elements in an Array.
-      */
-    reverse(): Int32Array;
-
-    /**
-      * Sets a value or an array of values.
-      * @param array A typed or untyped array of values to set.
-      * @param offset The index in the current array at which the values are to be written.
-      */
-    set(array: ArrayLike<number>, offset?: number): void;
-
-    /**
-      * Returns a section of an array.
-      * @param start The beginning of the specified portion of the array.
-      * @param end The end of the specified portion of the array.
-      */
-    slice(start?: number, end?: number): Int32Array;
-
-    /**
-      * Determines whether the specified callback function returns true for any element of an array.
-      * @param callbackfn A function that accepts up to three arguments. The some method calls the
-      * callbackfn function for each element in array1 until the callbackfn returns true, or until
-      * the end of the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    some(callbackfn: (value: number, index: number, array: Int32Array) => boolean, thisArg?: any): boolean;
-
-    /**
-      * Sorts an array.
-      * @param compareFn The name of the function used to determine the order of the elements. If
-      * omitted, the elements are sorted in ascending, ASCII character order.
-      */
-    sort(compareFn?: (a: number, b: number) => number): this;
-
-    /**
-      * Gets a new Int32Array view of the ArrayBuffer store for this array, referencing the elements
-      * at begin, inclusive, up to end, exclusive.
-      * @param begin The index of the beginning of the array.
-      * @param end The index of the end of the array.
-      */
-    subarray(begin: number, end?: number): Int32Array;
-
-    /**
-      * Converts a number to a string by using the current locale.
-      */
-    toLocaleString(): string;
-
-    /**
-      * Returns a string representation of an array.
-      */
-    toString(): string;
-
-    [index: number]: number;
-}
-
-interface Int32ArrayConstructor {
-    readonly prototype: Int32Array;
-    new(length: number): Int32Array;
-    new(arrayOrArrayBuffer: ArrayLike<number> | ArrayBufferLike): Int32Array;
-    new(buffer: ArrayBufferLike, byteOffset: number, length?: number): Int32Array;
-
-    /**
-      * The size in bytes of each element in the array.
-      */
-    readonly BYTES_PER_ELEMENT: number;
-
-    /**
-      * Returns a new array from a set of elements.
-      * @param items A set of elements to include in the new array object.
-      */
-    of(...items: number[]): Int32Array;
-
-    /**
-      * Creates an array from an array-like or iterable object.
-      * @param arrayLike An array-like or iterable object to convert to an array.
-      * @param mapfn A mapping function to call on every element of the array.
-      * @param thisArg Value of 'this' used to invoke the mapfn.
-      */
-    from(arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int32Array;
-
-}
-declare const Int32Array: Int32ArrayConstructor;
-
-/**
-  * A typed array of 32-bit unsigned integer values. The contents are initialized to 0. If the
-  * requested number of bytes could not be allocated an exception is raised.
-  */
-interface Uint32Array {
-    /**
-      * The size in bytes of each element in the array.
-      */
-    readonly BYTES_PER_ELEMENT: number;
-
-    /**
-      * The ArrayBuffer instance referenced by the array.
-      */
-    readonly buffer: ArrayBufferLike;
-
-    /**
-      * The length in bytes of the array.
-      */
-    readonly byteLength: number;
-
-    /**
-      * The offset in bytes of the array.
-      */
-    readonly byteOffset: number;
-
-    /**
-      * Returns the this object after copying a section of the array identified by start and end
-      * to the same array starting at position target
-      * @param target If target is negative, it is treated as length+target where length is the
-      * length of the array.
-      * @param start If start is negative, it is treated as length+start. If end is negative, it
-      * is treated as length+end.
-      * @param end If not specified, length of the this object is used as its default value.
-      */
-    copyWithin(target: number, start: number, end?: number): this;
-
-    /**
-      * Determines whether all the members of an array satisfy the specified test.
-      * @param callbackfn A function that accepts up to three arguments. The every method calls
-      * the callbackfn function for each element in array1 until the callbackfn returns false,
-      * or until the end of the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    every(callbackfn: (value: number, index: number, array: Uint32Array) => boolean, thisArg?: any): boolean;
-
-    /**
-        * Returns the this object after filling the section identified by start and end with value
-        * @param value value to fill array section with
-        * @param start index to start filling the array at. If start is negative, it is treated as
-        * length+start where length is the length of the array.
-        * @param end index to stop filling the array at. If end is negative, it is treated as
-        * length+end.
-        */
-    fill(value: number, start?: number, end?: number): this;
-
-    /**
-      * Returns the elements of an array that meet the condition specified in a callback function.
-      * @param callbackfn A function that accepts up to three arguments. The filter method calls
-      * the callbackfn function one time for each element in the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    filter(callbackfn: (value: number, index: number, array: Uint32Array) => any, thisArg?: any): Uint32Array;
-
-    /**
-      * Returns the value of the first element in the array where predicate is true, and undefined
-      * otherwise.
-      * @param predicate find calls predicate once for each element of the array, in ascending
-      * order, until it finds one where predicate returns true. If such an element is found, find
-      * immediately returns that element value. Otherwise, find returns undefined.
-      * @param thisArg If provided, it will be used as the this value for each invocation of
-      * predicate. If it is not provided, undefined is used instead.
-      */
-    find(predicate: (value: number, index: number, obj: Uint32Array) => boolean, thisArg?: any): number | undefined;
-
-    /**
-      * Returns the index of the first element in the array where predicate is true, and -1
-      * otherwise.
-      * @param predicate find calls predicate once for each element of the array, in ascending
-      * order, until it finds one where predicate returns true. If such an element is found,
-      * findIndex immediately returns that element index. Otherwise, findIndex returns -1.
-      * @param thisArg If provided, it will be used as the this value for each invocation of
-      * predicate. If it is not provided, undefined is used instead.
-      */
-    findIndex(predicate: (value: number, index: number, obj: Uint32Array) => boolean, thisArg?: any): number;
-
-    /**
-      * Performs the specified action for each element in an array.
-      * @param callbackfn  A function that accepts up to three arguments. forEach calls the
-      * callbackfn function one time for each element in the array.
-      * @param thisArg  An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    forEach(callbackfn: (value: number, index: number, array: Uint32Array) => void, thisArg?: any): void;
-    /**
-      * Returns the index of the first occurrence of a value in an array.
-      * @param searchElement The value to locate in the array.
-      * @param fromIndex The array index at which to begin the search. If fromIndex is omitted, the
-      *  search starts at index 0.
-      */
-    indexOf(searchElement: number, fromIndex?: number): number;
-
-    /**
-      * Adds all the elements of an array separated by the specified separator string.
-      * @param separator A string used to separate one element of an array from the next in the
-      * resulting String. If omitted, the array elements are separated with a comma.
-      */
-    join(separator?: string): string;
-
-    /**
-      * Returns the index of the last occurrence of a value in an array.
-      * @param searchElement The value to locate in the array.
-      * @param fromIndex The array index at which to begin the search. If fromIndex is omitted, the
-      * search starts at index 0.
-      */
-    lastIndexOf(searchElement: number, fromIndex?: number): number;
-
-    /**
-      * The length of the array.
-      */
-    readonly length: number;
-
-    /**
-      * Calls a defined callback function on each element of an array, and returns an array that
-      * contains the results.
-      * @param callbackfn A function that accepts up to three arguments. The map method calls the
-      * callbackfn function one time for each element in the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    map(callbackfn: (value: number, index: number, array: Uint32Array) => number, thisArg?: any): Uint32Array;
-
-    /**
-      * Calls the specified callback function for all the elements in an array. The return value of
-      * the callback function is the accumulated result, and is provided as an argument in the next
-      * call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduce method calls the
-      * callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduce(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Uint32Array) => number): number;
-    reduce(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Uint32Array) => number, initialValue: number): number;
-
-    /**
-      * Calls the specified callback function for all the elements in an array. The return value of
-      * the callback function is the accumulated result, and is provided as an argument in the next
-      * call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduce method calls the
-      * callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduce<U>(callbackfn: (previousValue: U, currentValue: number, currentIndex: number, array: Uint32Array) => U, initialValue: U): U;
-
-    /**
-      * Calls the specified callback function for all the elements in an array, in descending order.
-      * The return value of the callback function is the accumulated result, and is provided as an
-      * argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduceRight method calls
-      * the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an
-      * argument instead of an array value.
-      */
-    reduceRight(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Uint32Array) => number): number;
-    reduceRight(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Uint32Array) => number, initialValue: number): number;
-
-    /**
-      * Calls the specified callback function for all the elements in an array, in descending order.
-      * The return value of the callback function is the accumulated result, and is provided as an
-      * argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduceRight method calls
-      * the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduceRight<U>(callbackfn: (previousValue: U, currentValue: number, currentIndex: number, array: Uint32Array) => U, initialValue: U): U;
-
-    /**
-      * Reverses the elements in an Array.
-      */
-    reverse(): Uint32Array;
-
-    /**
-      * Sets a value or an array of values.
-      * @param array A typed or untyped array of values to set.
-      * @param offset The index in the current array at which the values are to be written.
-      */
-    set(array: ArrayLike<number>, offset?: number): void;
-
-    /**
-      * Returns a section of an array.
-      * @param start The beginning of the specified portion of the array.
-      * @param end The end of the specified portion of the array.
-      */
-    slice(start?: number, end?: number): Uint32Array;
-
-    /**
-      * Determines whether the specified callback function returns true for any element of an array.
-      * @param callbackfn A function that accepts up to three arguments. The some method calls the
-      * callbackfn function for each element in array1 until the callbackfn returns true, or until
-      * the end of the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    some(callbackfn: (value: number, index: number, array: Uint32Array) => boolean, thisArg?: any): boolean;
-
-    /**
-      * Sorts an array.
-      * @param compareFn The name of the function used to determine the order of the elements. If
-      * omitted, the elements are sorted in ascending, ASCII character order.
-      */
-    sort(compareFn?: (a: number, b: number) => number): this;
-
-    /**
-      * Gets a new Uint32Array view of the ArrayBuffer store for this array, referencing the elements
-      * at begin, inclusive, up to end, exclusive.
-      * @param begin The index of the beginning of the array.
-      * @param end The index of the end of the array.
-      */
-    subarray(begin: number, end?: number): Uint32Array;
-
-    /**
-      * Converts a number to a string by using the current locale.
-      */
-    toLocaleString(): string;
-
-    /**
-      * Returns a string representation of an array.
-      */
-    toString(): string;
-
-    [index: number]: number;
-}
-
-interface Uint32ArrayConstructor {
-    readonly prototype: Uint32Array;
-    new(length: number): Uint32Array;
-    new(arrayOrArrayBuffer: ArrayLike<number> | ArrayBufferLike): Uint32Array;
-    new(buffer: ArrayBufferLike, byteOffset: number, length?: number): Uint32Array;
-
-    /**
-      * The size in bytes of each element in the array.
-      */
-    readonly BYTES_PER_ELEMENT: number;
-
-    /**
-      * Returns a new array from a set of elements.
-      * @param items A set of elements to include in the new array object.
-      */
-    of(...items: number[]): Uint32Array;
-
-    /**
-      * Creates an array from an array-like or iterable object.
-      * @param arrayLike An array-like or iterable object to convert to an array.
-      * @param mapfn A mapping function to call on every element of the array.
-      * @param thisArg Value of 'this' used to invoke the mapfn.
-      */
-    from(arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint32Array;
-
-}
-declare const Uint32Array: Uint32ArrayConstructor;
-
-/**
-  * A typed array of 32-bit float values. The contents are initialized to 0. If the requested number
-  * of bytes could not be allocated an exception is raised.
-  */
-interface Float32Array {
-    /**
-      * The size in bytes of each element in the array.
-      */
-    readonly BYTES_PER_ELEMENT: number;
-
-    /**
-      * The ArrayBuffer instance referenced by the array.
-      */
-    readonly buffer: ArrayBufferLike;
-
-    /**
-      * The length in bytes of the array.
-      */
-    readonly byteLength: number;
-
-    /**
-      * The offset in bytes of the array.
-      */
-    readonly byteOffset: number;
-
-    /**
-      * Returns the this object after copying a section of the array identified by start and end
-      * to the same array starting at position target
-      * @param target If target is negative, it is treated as length+target where length is the
-      * length of the array.
-      * @param start If start is negative, it is treated as length+start. If end is negative, it
-      * is treated as length+end.
-      * @param end If not specified, length of the this object is used as its default value.
-      */
-    copyWithin(target: number, start: number, end?: number): this;
-
-    /**
-      * Determines whether all the members of an array satisfy the specified test.
-      * @param callbackfn A function that accepts up to three arguments. The every method calls
-      * the callbackfn function for each element in array1 until the callbackfn returns false,
-      * or until the end of the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    every(callbackfn: (value: number, index: number, array: Float32Array) => boolean, thisArg?: any): boolean;
-
-    /**
-        * Returns the this object after filling the section identified by start and end with value
-        * @param value value to fill array section with
-        * @param start index to start filling the array at. If start is negative, it is treated as
-        * length+start where length is the length of the array.
-        * @param end index to stop filling the array at. If end is negative, it is treated as
-        * length+end.
-        */
-    fill(value: number, start?: number, end?: number): this;
-
-    /**
-      * Returns the elements of an array that meet the condition specified in a callback function.
-      * @param callbackfn A function that accepts up to three arguments. The filter method calls
-      * the callbackfn function one time for each element in the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    filter(callbackfn: (value: number, index: number, array: Float32Array) => any, thisArg?: any): Float32Array;
-
-    /**
-      * Returns the value of the first element in the array where predicate is true, and undefined
-      * otherwise.
-      * @param predicate find calls predicate once for each element of the array, in ascending
-      * order, until it finds one where predicate returns true. If such an element is found, find
-      * immediately returns that element value. Otherwise, find returns undefined.
-      * @param thisArg If provided, it will be used as the this value for each invocation of
-      * predicate. If it is not provided, undefined is used instead.
-      */
-    find(predicate: (value: number, index: number, obj: Float32Array) => boolean, thisArg?: any): number | undefined;
-
-    /**
-      * Returns the index of the first element in the array where predicate is true, and -1
-      * otherwise.
-      * @param predicate find calls predicate once for each element of the array, in ascending
-      * order, until it finds one where predicate returns true. If such an element is found,
-      * findIndex immediately returns that element index. Otherwise, findIndex returns -1.
-      * @param thisArg If provided, it will be used as the this value for each invocation of
-      * predicate. If it is not provided, undefined is used instead.
-      */
-    findIndex(predicate: (value: number, index: number, obj: Float32Array) => boolean, thisArg?: any): number;
-
-    /**
-      * Performs the specified action for each element in an array.
-      * @param callbackfn  A function that accepts up to three arguments. forEach calls the
-      * callbackfn function one time for each element in the array.
-      * @param thisArg  An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    forEach(callbackfn: (value: number, index: number, array: Float32Array) => void, thisArg?: any): void;
-
-    /**
-      * Returns the index of the first occurrence of a value in an array.
-      * @param searchElement The value to locate in the array.
-      * @param fromIndex The array index at which to begin the search. If fromIndex is omitted, the
-      *  search starts at index 0.
-      */
-    indexOf(searchElement: number, fromIndex?: number): number;
-
-    /**
-      * Adds all the elements of an array separated by the specified separator string.
-      * @param separator A string used to separate one element of an array from the next in the
-      * resulting String. If omitted, the array elements are separated with a comma.
-      */
-    join(separator?: string): string;
-
-    /**
-      * Returns the index of the last occurrence of a value in an array.
-      * @param searchElement The value to locate in the array.
-      * @param fromIndex The array index at which to begin the search. If fromIndex is omitted, the
-      * search starts at index 0.
-      */
-    lastIndexOf(searchElement: number, fromIndex?: number): number;
-
-    /**
-      * The length of the array.
-      */
-    readonly length: number;
-
-    /**
-      * Calls a defined callback function on each element of an array, and returns an array that
-      * contains the results.
-      * @param callbackfn A function that accepts up to three arguments. The map method calls the
-      * callbackfn function one time for each element in the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    map(callbackfn: (value: number, index: number, array: Float32Array) => number, thisArg?: any): Float32Array;
-
-    /**
-      * Calls the specified callback function for all the elements in an array. The return value of
-      * the callback function is the accumulated result, and is provided as an argument in the next
-      * call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduce method calls the
-      * callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduce(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Float32Array) => number): number;
-    reduce(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Float32Array) => number, initialValue: number): number;
-
-    /**
-      * Calls the specified callback function for all the elements in an array. The return value of
-      * the callback function is the accumulated result, and is provided as an argument in the next
-      * call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduce method calls the
-      * callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduce<U>(callbackfn: (previousValue: U, currentValue: number, currentIndex: number, array: Float32Array) => U, initialValue: U): U;
-
-    /**
-      * Calls the specified callback function for all the elements in an array, in descending order.
-      * The return value of the callback function is the accumulated result, and is provided as an
-      * argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduceRight method calls
-      * the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an
-      * argument instead of an array value.
-      */
-    reduceRight(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Float32Array) => number): number;
-    reduceRight(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Float32Array) => number, initialValue: number): number;
-
-    /**
-      * Calls the specified callback function for all the elements in an array, in descending order.
-      * The return value of the callback function is the accumulated result, and is provided as an
-      * argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduceRight method calls
-      * the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduceRight<U>(callbackfn: (previousValue: U, currentValue: number, currentIndex: number, array: Float32Array) => U, initialValue: U): U;
-
-    /**
-      * Reverses the elements in an Array.
-      */
-    reverse(): Float32Array;
-
-    /**
-      * Sets a value or an array of values.
-      * @param array A typed or untyped array of values to set.
-      * @param offset The index in the current array at which the values are to be written.
-      */
-    set(array: ArrayLike<number>, offset?: number): void;
-
-    /**
-      * Returns a section of an array.
-      * @param start The beginning of the specified portion of the array.
-      * @param end The end of the specified portion of the array.
-      */
-    slice(start?: number, end?: number): Float32Array;
-
-    /**
-      * Determines whether the specified callback function returns true for any element of an array.
-      * @param callbackfn A function that accepts up to three arguments. The some method calls the
-      * callbackfn function for each element in array1 until the callbackfn returns true, or until
-      * the end of the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    some(callbackfn: (value: number, index: number, array: Float32Array) => boolean, thisArg?: any): boolean;
-
-    /**
-      * Sorts an array.
-      * @param compareFn The name of the function used to determine the order of the elements. If
-      * omitted, the elements are sorted in ascending, ASCII character order.
-      */
-    sort(compareFn?: (a: number, b: number) => number): this;
-
-    /**
-      * Gets a new Float32Array view of the ArrayBuffer store for this array, referencing the elements
-      * at begin, inclusive, up to end, exclusive.
-      * @param begin The index of the beginning of the array.
-      * @param end The index of the end of the array.
-      */
-    subarray(begin: number, end?: number): Float32Array;
-
-    /**
-      * Converts a number to a string by using the current locale.
-      */
-    toLocaleString(): string;
-
-    /**
-      * Returns a string representation of an array.
-      */
-    toString(): string;
-
-    [index: number]: number;
-}
-
-interface Float32ArrayConstructor {
-    readonly prototype: Float32Array;
-    new(length: number): Float32Array;
-    new(arrayOrArrayBuffer: ArrayLike<number> | ArrayBufferLike): Float32Array;
-    new(buffer: ArrayBufferLike, byteOffset: number, length?: number): Float32Array;
-
-    /**
-      * The size in bytes of each element in the array.
-      */
-    readonly BYTES_PER_ELEMENT: number;
-
-    /**
-      * Returns a new array from a set of elements.
-      * @param items A set of elements to include in the new array object.
-      */
-    of(...items: number[]): Float32Array;
-
-    /**
-      * Creates an array from an array-like or iterable object.
-      * @param arrayLike An array-like or iterable object to convert to an array.
-      * @param mapfn A mapping function to call on every element of the array.
-      * @param thisArg Value of 'this' used to invoke the mapfn.
-      */
-    from(arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Float32Array;
-
-
-}
-declare const Float32Array: Float32ArrayConstructor;
-
-/**
-  * A typed array of 64-bit float values. The contents are initialized to 0. If the requested
-  * number of bytes could not be allocated an exception is raised.
-  */
-interface Float64Array {
-    /**
-      * The size in bytes of each element in the array.
-      */
-    readonly BYTES_PER_ELEMENT: number;
-
-    /**
-      * The ArrayBuffer instance referenced by the array.
-      */
-    readonly buffer: ArrayBufferLike;
-
-    /**
-      * The length in bytes of the array.
-      */
-    readonly byteLength: number;
-
-    /**
-      * The offset in bytes of the array.
-      */
-    readonly byteOffset: number;
-
-    /**
-      * Returns the this object after copying a section of the array identified by start and end
-      * to the same array starting at position target
-      * @param target If target is negative, it is treated as length+target where length is the
-      * length of the array.
-      * @param start If start is negative, it is treated as length+start. If end is negative, it
-      * is treated as length+end.
-      * @param end If not specified, length of the this object is used as its default value.
-      */
-    copyWithin(target: number, start: number, end?: number): this;
-
-    /**
-      * Determines whether all the members of an array satisfy the specified test.
-      * @param callbackfn A function that accepts up to three arguments. The every method calls
-      * the callbackfn function for each element in array1 until the callbackfn returns false,
-      * or until the end of the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    every(callbackfn: (value: number, index: number, array: Float64Array) => boolean, thisArg?: any): boolean;
-
-    /**
-        * Returns the this object after filling the section identified by start and end with value
-        * @param value value to fill array section with
-        * @param start index to start filling the array at. If start is negative, it is treated as
-        * length+start where length is the length of the array.
-        * @param end index to stop filling the array at. If end is negative, it is treated as
-        * length+end.
-        */
-    fill(value: number, start?: number, end?: number): this;
-
-    /**
-      * Returns the elements of an array that meet the condition specified in a callback function.
-      * @param callbackfn A function that accepts up to three arguments. The filter method calls
-      * the callbackfn function one time for each element in the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    filter(callbackfn: (value: number, index: number, array: Float64Array) => any, thisArg?: any): Float64Array;
-
-    /**
-      * Returns the value of the first element in the array where predicate is true, and undefined
-      * otherwise.
-      * @param predicate find calls predicate once for each element of the array, in ascending
-      * order, until it finds one where predicate returns true. If such an element is found, find
-      * immediately returns that element value. Otherwise, find returns undefined.
-      * @param thisArg If provided, it will be used as the this value for each invocation of
-      * predicate. If it is not provided, undefined is used instead.
-      */
-    find(predicate: (value: number, index: number, obj: Float64Array) => boolean, thisArg?: any): number | undefined;
-
-    /**
-      * Returns the index of the first element in the array where predicate is true, and -1
-      * otherwise.
-      * @param predicate find calls predicate once for each element of the array, in ascending
-      * order, until it finds one where predicate returns true. If such an element is found,
-      * findIndex immediately returns that element index. Otherwise, findIndex returns -1.
-      * @param thisArg If provided, it will be used as the this value for each invocation of
-      * predicate. If it is not provided, undefined is used instead.
-      */
-    findIndex(predicate: (value: number, index: number, obj: Float64Array) => boolean, thisArg?: any): number;
-
-    /**
-      * Performs the specified action for each element in an array.
-      * @param callbackfn  A function that accepts up to three arguments. forEach calls the
-      * callbackfn function one time for each element in the array.
-      * @param thisArg  An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    forEach(callbackfn: (value: number, index: number, array: Float64Array) => void, thisArg?: any): void;
-
-    /**
-      * Returns the index of the first occurrence of a value in an array.
-      * @param searchElement The value to locate in the array.
-      * @param fromIndex The array index at which to begin the search. If fromIndex is omitted, the
-      *  search starts at index 0.
-      */
-    indexOf(searchElement: number, fromIndex?: number): number;
-
-    /**
-      * Adds all the elements of an array separated by the specified separator string.
-      * @param separator A string used to separate one element of an array from the next in the
-      * resulting String. If omitted, the array elements are separated with a comma.
-      */
-    join(separator?: string): string;
-
-    /**
-      * Returns the index of the last occurrence of a value in an array.
-      * @param searchElement The value to locate in the array.
-      * @param fromIndex The array index at which to begin the search. If fromIndex is omitted, the
-      * search starts at index 0.
-      */
-    lastIndexOf(searchElement: number, fromIndex?: number): number;
-
-    /**
-      * The length of the array.
-      */
-    readonly length: number;
-
-    /**
-      * Calls a defined callback function on each element of an array, and returns an array that
-      * contains the results.
-      * @param callbackfn A function that accepts up to three arguments. The map method calls the
-      * callbackfn function one time for each element in the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    map(callbackfn: (value: number, index: number, array: Float64Array) => number, thisArg?: any): Float64Array;
-
-    /**
-      * Calls the specified callback function for all the elements in an array. The return value of
-      * the callback function is the accumulated result, and is provided as an argument in the next
-      * call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduce method calls the
-      * callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduce(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Float64Array) => number): number;
-    reduce(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Float64Array) => number, initialValue: number): number;
-
-    /**
-      * Calls the specified callback function for all the elements in an array. The return value of
-      * the callback function is the accumulated result, and is provided as an argument in the next
-      * call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduce method calls the
-      * callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduce<U>(callbackfn: (previousValue: U, currentValue: number, currentIndex: number, array: Float64Array) => U, initialValue: U): U;
-
-    /**
-      * Calls the specified callback function for all the elements in an array, in descending order.
-      * The return value of the callback function is the accumulated result, and is provided as an
-      * argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduceRight method calls
-      * the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an
-      * argument instead of an array value.
-      */
-    reduceRight(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Float64Array) => number): number;
-    reduceRight(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Float64Array) => number, initialValue: number): number;
-
-    /**
-      * Calls the specified callback function for all the elements in an array, in descending order.
-      * The return value of the callback function is the accumulated result, and is provided as an
-      * argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduceRight method calls
-      * the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduceRight<U>(callbackfn: (previousValue: U, currentValue: number, currentIndex: number, array: Float64Array) => U, initialValue: U): U;
-
-    /**
-      * Reverses the elements in an Array.
-      */
-    reverse(): Float64Array;
-
-    /**
-      * Sets a value or an array of values.
-      * @param array A typed or untyped array of values to set.
-      * @param offset The index in the current array at which the values are to be written.
-      */
-    set(array: ArrayLike<number>, offset?: number): void;
-
-    /**
-      * Returns a section of an array.
-      * @param start The beginning of the specified portion of the array.
-      * @param end The end of the specified portion of the array.
-      */
-    slice(start?: number, end?: number): Float64Array;
-
-    /**
-      * Determines whether the specified callback function returns true for any element of an array.
-      * @param callbackfn A function that accepts up to three arguments. The some method calls the
-      * callbackfn function for each element in array1 until the callbackfn returns true, or until
-      * the end of the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    some(callbackfn: (value: number, index: number, array: Float64Array) => boolean, thisArg?: any): boolean;
-
-    /**
-      * Sorts an array.
-      * @param compareFn The name of the function used to determine the order of the elements. If
-      * omitted, the elements are sorted in ascending, ASCII character order.
-      */
-    sort(compareFn?: (a: number, b: number) => number): this;
-
-    /**
-      * Gets a new Float64Array view of the ArrayBuffer store for this array, referencing the elements
-      * at begin, inclusive, up to end, exclusive.
-      * @param begin The index of the beginning of the array.
-      * @param end The index of the end of the array.
-      */
-    subarray(begin: number, end?: number): Float64Array;
-
-    /**
-      * Converts a number to a string by using the current locale.
-      */
-    toLocaleString(): string;
-
-    /**
-      * Returns a string representation of an array.
-      */
-    toString(): string;
-
-    [index: number]: number;
-}
-
-interface Float64ArrayConstructor {
-    readonly prototype: Float64Array;
-    new(length: number): Float64Array;
-    new(arrayOrArrayBuffer: ArrayLike<number> | ArrayBufferLike): Float64Array;
-    new(buffer: ArrayBufferLike, byteOffset: number, length?: number): Float64Array;
-
-    /**
-      * The size in bytes of each element in the array.
-      */
-    readonly BYTES_PER_ELEMENT: number;
-
-    /**
-      * Returns a new array from a set of elements.
-      * @param items A set of elements to include in the new array object.
-      */
-    of(...items: number[]): Float64Array;
-
-    /**
-      * Creates an array from an array-like or iterable object.
-      * @param arrayLike An array-like or iterable object to convert to an array.
-      * @param mapfn A mapping function to call on every element of the array.
-      * @param thisArg Value of 'this' used to invoke the mapfn.
-      */
-    from(arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Float64Array;
-
-}
-declare const Float64Array: Float64ArrayConstructor;
-
-/////////////////////////////
-/// ECMAScript Internationalization API
-/////////////////////////////
-
-declare namespace Intl {
-    interface CollatorOptions {
-        usage?: string;
-        localeMatcher?: string;
-        numeric?: boolean;
-        caseFirst?: string;
-        sensitivity?: string;
-        ignorePunctuation?: boolean;
-    }
-
-    interface ResolvedCollatorOptions {
-        locale: string;
-        usage: string;
-        sensitivity: string;
-        ignorePunctuation: boolean;
-        collation: string;
-        caseFirst: string;
-        numeric: boolean;
-    }
-
-    interface Collator {
-        compare(x: string, y: string): number;
-        resolvedOptions(): ResolvedCollatorOptions;
-    }
-    var Collator: {
-        new(locales?: string | string[], options?: CollatorOptions): Collator;
-        (locales?: string | string[], options?: CollatorOptions): Collator;
-        supportedLocalesOf(locales: string | string[], options?: CollatorOptions): string[];
-    };
-
-    interface NumberFormatOptions {
-        localeMatcher?: string;
-        style?: string;
-        currency?: string;
-        currencyDisplay?: string;
-        useGrouping?: boolean;
-        minimumIntegerDigits?: number;
-        minimumFractionDigits?: number;
-        maximumFractionDigits?: number;
-        minimumSignificantDigits?: number;
-        maximumSignificantDigits?: number;
-    }
-
-    interface ResolvedNumberFormatOptions {
-        locale: string;
-        numberingSystem: string;
-        style: string;
-        currency?: string;
-        currencyDisplay?: string;
-        minimumIntegerDigits: number;
-        minimumFractionDigits: number;
-        maximumFractionDigits: number;
-        minimumSignificantDigits?: number;
-        maximumSignificantDigits?: number;
-        useGrouping: boolean;
-    }
-
-    interface NumberFormat {
-        format(value: number): string;
-        resolvedOptions(): ResolvedNumberFormatOptions;
-    }
-    var NumberFormat: {
-        new(locales?: string | string[], options?: NumberFormatOptions): NumberFormat;
-        (locales?: string | string[], options?: NumberFormatOptions): NumberFormat;
-        supportedLocalesOf(locales: string | string[], options?: NumberFormatOptions): string[];
-    };
-
-    interface DateTimeFormatOptions {
-        localeMatcher?: string;
-        weekday?: string;
-        era?: string;
-        year?: string;
-        month?: string;
-        day?: string;
-        hour?: string;
-        minute?: string;
-        second?: string;
-        timeZoneName?: string;
-        formatMatcher?: string;
-        hour12?: boolean;
-        timeZone?: string;
-    }
-
-    interface ResolvedDateTimeFormatOptions {
-        locale: string;
-        calendar: string;
-        numberingSystem: string;
-        timeZone: string;
-        hour12?: boolean;
-        weekday?: string;
-        era?: string;
-        year?: string;
-        month?: string;
-        day?: string;
-        hour?: string;
-        minute?: string;
-        second?: string;
-        timeZoneName?: string;
-    }
-
-    interface DateTimeFormat {
-        format(date?: Date | number): string;
-        resolvedOptions(): ResolvedDateTimeFormatOptions;
-    }
-    var DateTimeFormat: {
-        new(locales?: string | string[], options?: DateTimeFormatOptions): DateTimeFormat;
-        (locales?: string | string[], options?: DateTimeFormatOptions): DateTimeFormat;
-        supportedLocalesOf(locales: string | string[], options?: DateTimeFormatOptions): string[];
-    };
-}
-
-interface String {
-    /**
-      * Determines whether two strings are equivalent in the current or specified locale.
-      * @param that String to compare to target string
-      * @param locales A locale string or array of locale strings that contain one or more language or locale tags. If you include more than one locale string, list them in descending order of priority so that the first entry is the preferred locale. If you omit this parameter, the default locale of the JavaScript runtime is used. This parameter must conform to BCP 47 standards; see the Intl.Collator object for details.
-      * @param options An object that contains one or more properties that specify comparison options. see the Intl.Collator object for details.
-      */
-    localeCompare(that: string, locales?: string | string[], options?: Intl.CollatorOptions): number;
-}
-
-interface Number {
-    /**
-      * Converts a number to a string by using the current or specified locale.
-      * @param locales A locale string or array of locale strings that contain one or more language or locale tags. If you include more than one locale string, list them in descending order of priority so that the first entry is the preferred locale. If you omit this parameter, the default locale of the JavaScript runtime is used.
-      * @param options An object that contains one or more properties that specify comparison options.
-      */
-    toLocaleString(locales?: string | string[], options?: Intl.NumberFormatOptions): string;
-}
-
-interface Date {
-    /**
-      * Converts a date and time to a string by using the current or specified locale.
-      * @param locales A locale string or array of locale strings that contain one or more language or locale tags. If you include more than one locale string, list them in descending order of priority so that the first entry is the preferred locale. If you omit this parameter, the default locale of the JavaScript runtime is used.
-      * @param options An object that contains one or more properties that specify comparison options.
-      */
-    toLocaleString(locales?: string | string[], options?: Intl.DateTimeFormatOptions): string;
-    /**
-      * Converts a date to a string by using the current or specified locale.
-      * @param locales A locale string or array of locale strings that contain one or more language or locale tags. If you include more than one locale string, list them in descending order of priority so that the first entry is the preferred locale. If you omit this parameter, the default locale of the JavaScript runtime is used.
-      * @param options An object that contains one or more properties that specify comparison options.
-      */
-    toLocaleDateString(locales?: string | string[], options?: Intl.DateTimeFormatOptions): string;
-
-    /**
-      * Converts a time to a string by using the current or specified locale.
-      * @param locales A locale string or array of locale strings that contain one or more language or locale tags. If you include more than one locale string, list them in descending order of priority so that the first entry is the preferred locale. If you omit this parameter, the default locale of the JavaScript runtime is used.
-      * @param options An object that contains one or more properties that specify comparison options.
-      */
-    toLocaleTimeString(locales?: string | string[], options?: Intl.DateTimeFormatOptions): string;
-}
-
-
-/////////////////////////////
-/// DOM APIs
-/////////////////////////////
-
-interface Account {
-    displayName: string;
-    id: string;
-    imageURL?: string;
-    name?: string;
-    rpDisplayName: string;
-}
-
-interface AddEventListenerOptions extends EventListenerOptions {
-    once?: boolean;
-    passive?: boolean;
-}
-
-interface AesCbcParams extends Algorithm {
-    iv: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-}
-
-interface AesCtrParams extends Algorithm {
-    counter: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-    length: number;
-}
-
-interface AesDerivedKeyParams extends Algorithm {
-    length: number;
-}
-
-interface AesGcmParams extends Algorithm {
-    additionalData?: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-    iv: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-    tagLength?: number;
-}
-
-interface AesKeyAlgorithm extends KeyAlgorithm {
-    length: number;
-}
-
-interface AesKeyGenParams extends Algorithm {
-    length: number;
-}
-
-interface Algorithm {
-    name: string;
-}
-
-interface AnalyserOptions extends AudioNodeOptions {
-    fftSize?: number;
-    maxDecibels?: number;
-    minDecibels?: number;
-    smoothingTimeConstant?: number;
-}
-
-interface AnimationEventInit extends EventInit {
-    animationName?: string;
-    elapsedTime?: number;
-}
-
-interface AssertionOptions {
-    allowList?: ScopedCredentialDescriptor[];
-    extensions?: WebAuthnExtensions;
-    rpId?: string;
-    timeoutSeconds?: number;
-}
-
-interface AudioBufferOptions {
-    length: number;
-    numberOfChannels?: number;
-    sampleRate: number;
-}
-
-interface AudioBufferSourceOptions {
-    buffer?: AudioBuffer | null;
-    detune?: number;
-    loop?: boolean;
-    loopEnd?: number;
-    loopStart?: number;
-    playbackRate?: number;
-}
-
-interface AudioContextInfo {
-    currentTime?: number;
-    sampleRate?: number;
-}
-
-interface AudioContextOptions {
-    latencyHint?: AudioContextLatencyCategory | number;
-    sampleRate?: number;
-}
-
-interface AudioNodeOptions {
-    channelCount?: number;
-    channelCountMode?: ChannelCountMode;
-    channelInterpretation?: ChannelInterpretation;
-}
-
-interface AudioParamDescriptor {
-    defaultValue?: number;
-    maxValue?: number;
-    minValue?: number;
-    name?: string;
-}
-
-interface AudioProcessingEventInit extends EventInit {
-    inputBuffer: AudioBuffer;
-    outputBuffer: AudioBuffer;
-    playbackTime: number;
-}
-
-interface AudioTimestamp {
-    contextTime?: number;
-    performanceTime?: number;
-}
-
-interface BiquadFilterOptions extends AudioNodeOptions {
-    Q?: number;
-    detune?: number;
-    frequency?: number;
-    gain?: number;
-    type?: BiquadFilterType;
-}
-
-interface ByteLengthChunk {
-    byteLength?: number;
-}
-
-interface CacheQueryOptions {
-    cacheName?: string;
-    ignoreMethod?: boolean;
-    ignoreSearch?: boolean;
-    ignoreVary?: boolean;
-}
-
-interface ChannelMergerOptions extends AudioNodeOptions {
-    numberOfInputs?: number;
-}
-
-interface ChannelSplitterOptions extends AudioNodeOptions {
-    numberOfOutputs?: number;
-}
-
-interface ClientData {
-    challenge: string;
-    extensions?: WebAuthnExtensions;
-    hashAlg: string | Algorithm;
-    origin: string;
-    rpId: string;
-    tokenBinding?: string;
-}
-
-interface ClientQueryOptions {
-    includeReserved?: boolean;
-    includeUncontrolled?: boolean;
-    type?: ClientTypes;
-}
-
-interface CloseEventInit extends EventInit {
-    code?: number;
-    reason?: string;
-    wasClean?: boolean;
-}
-
-interface CompositionEventInit extends UIEventInit {
-    data?: string;
-}
-
-interface ConfirmSiteSpecificExceptionsInformation extends ExceptionInformation {
-    arrayOfDomainStrings?: string[];
-}
-
-interface ConstantSourceOptions {
-    offset?: number;
-}
-
-interface ConstrainBooleanParameters {
-    exact?: boolean;
-    ideal?: boolean;
-}
-
-interface ConstrainDOMStringParameters {
-    exact?: string | string[];
-    ideal?: string | string[];
-}
-
-interface ConstrainDoubleRange extends DoubleRange {
-    exact?: number;
-    ideal?: number;
-}
-
-interface ConstrainLongRange extends LongRange {
-    exact?: number;
-    ideal?: number;
-}
-
-interface ConstrainVideoFacingModeParameters {
-    exact?: VideoFacingModeEnum | VideoFacingModeEnum[];
-    ideal?: VideoFacingModeEnum | VideoFacingModeEnum[];
-}
-
-interface ConvolverOptions extends AudioNodeOptions {
-    buffer?: AudioBuffer | null;
-    disableNormalization?: boolean;
-}
-
-interface CustomEventInit<T = any> extends EventInit {
-    detail?: T;
-}
-
-interface DOMRectInit {
-    height?: number;
-    width?: number;
-    x?: number;
-    y?: number;
-}
-
-interface DelayOptions extends AudioNodeOptions {
-    delayTime?: number;
-    maxDelayTime?: number;
-}
-
-interface DeviceAccelerationDict {
-    x?: number | null;
-    y?: number | null;
-    z?: number | null;
-}
-
-interface DeviceLightEventInit extends EventInit {
-    value?: number;
-}
-
-interface DeviceMotionEventInit extends EventInit {
-    acceleration?: DeviceAccelerationDict | null;
-    accelerationIncludingGravity?: DeviceAccelerationDict | null;
-    interval?: number | null;
-    rotationRate?: DeviceRotationRateDict | null;
-}
-
-interface DeviceOrientationEventInit extends EventInit {
-    absolute?: boolean;
-    alpha?: number | null;
-    beta?: number | null;
-    gamma?: number | null;
-}
-
-interface DeviceRotationRateDict {
-    alpha?: number | null;
-    beta?: number | null;
-    gamma?: number | null;
-}
-
-interface DoubleRange {
-    max?: number;
-    min?: number;
-}
-
-interface DynamicsCompressorOptions extends AudioNodeOptions {
-    attack?: number;
-    knee?: number;
-    ratio?: number;
-    release?: number;
-    threshold?: number;
-}
-
-interface EcKeyAlgorithm extends KeyAlgorithm {
-    namedCurve: string;
-}
-
-interface EcKeyGenParams extends Algorithm {
-    namedCurve: string;
-}
-
-interface EcKeyImportParams extends Algorithm {
-    namedCurve: string;
-}
-
-interface EcdhKeyDeriveParams extends Algorithm {
-    public: CryptoKey;
-}
-
-interface EcdsaParams extends Algorithm {
-    hash: string | Algorithm;
-}
-
-interface ErrorEventInit extends EventInit {
-    colno?: number;
-    error?: any;
-    filename?: string;
-    lineno?: number;
-    message?: string;
-}
-
-interface EventInit {
-    bubbles?: boolean;
-    cancelable?: boolean;
-    scoped?: boolean;
-}
-
-interface EventListenerOptions {
-    capture?: boolean;
-}
-
-interface EventModifierInit extends UIEventInit {
-    altKey?: boolean;
-    ctrlKey?: boolean;
-    metaKey?: boolean;
-    modifierAltGraph?: boolean;
-    modifierCapsLock?: boolean;
-    modifierFn?: boolean;
-    modifierFnLock?: boolean;
-    modifierHyper?: boolean;
-    modifierNumLock?: boolean;
-    modifierOS?: boolean;
-    modifierScrollLock?: boolean;
-    modifierSuper?: boolean;
-    modifierSymbol?: boolean;
-    modifierSymbolLock?: boolean;
-    shiftKey?: boolean;
-}
-
-interface ExceptionInformation {
-    domain?: string | null;
-}
-
-interface ExtendableEventInit extends EventInit {
-}
-
-interface ExtendableMessageEventInit extends ExtendableEventInit {
-    data?: any;
-    lastEventId?: string;
-    origin?: string;
-    ports?: MessagePort[] | null;
-    source?: object | ServiceWorker | MessagePort | null;
-}
-
-interface FetchEventInit extends ExtendableEventInit {
-    clientId?: string;
-    request: Request;
-    reservedClientId?: string;
-    targetClientId?: string;
-}
-
-interface FocusEventInit extends UIEventInit {
-    relatedTarget?: EventTarget | null;
-}
-
-interface FocusNavigationEventInit extends EventInit {
-    navigationReason?: string | null;
-    originHeight?: number;
-    originLeft?: number;
-    originTop?: number;
-    originWidth?: number;
-}
-
-interface FocusNavigationOrigin {
-    originHeight?: number;
-    originLeft?: number;
-    originTop?: number;
-    originWidth?: number;
-}
-
-interface GainOptions extends AudioNodeOptions {
-    gain?: number;
-}
-
-interface GamepadEventInit extends EventInit {
-    gamepad?: Gamepad;
-}
-
-interface GetNotificationOptions {
-    tag?: string;
-}
-
-interface HashChangeEventInit extends EventInit {
-    newURL?: string;
-    oldURL?: string;
-}
-
-interface HkdfParams extends Algorithm {
-    hash: string | Algorithm;
-    info: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-    salt: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-}
-
-interface HmacImportParams extends Algorithm {
-    hash: string | Algorithm;
-    length?: number;
-}
-
-interface HmacKeyAlgorithm extends KeyAlgorithm {
-    hash: KeyAlgorithm;
-    length: number;
-}
-
-interface HmacKeyGenParams extends Algorithm {
-    hash: string | Algorithm;
-    length?: number;
-}
-
-interface IDBIndexParameters {
-    multiEntry?: boolean;
-    unique?: boolean;
-}
-
-interface IDBObjectStoreParameters {
-    autoIncrement?: boolean;
-    keyPath?: string | string[];
-}
-
-interface IIRFilterOptions extends AudioNodeOptions {
-    feedback: number[];
-    feedforward: number[];
-}
-
-interface IntersectionObserverEntryInit {
-    boundingClientRect: DOMRectInit;
-    intersectionRect: DOMRectInit;
-    isIntersecting: boolean;
-    rootBounds: DOMRectInit;
-    target: Element;
-    time: number;
-}
-
-interface IntersectionObserverInit {
-    root?: Element | null;
-    rootMargin?: string;
-    threshold?: number | number[];
-}
-
-interface JsonWebKey {
-    alg?: string;
-    crv?: string;
-    d?: string;
-    dp?: string;
-    dq?: string;
-    e?: string;
-    ext?: boolean;
-    k?: string;
-    key_ops?: string[];
-    kty?: string;
-    n?: string;
-    oth?: RsaOtherPrimesInfo[];
-    p?: string;
-    q?: string;
-    qi?: string;
-    use?: string;
-    x?: string;
-    y?: string;
-}
-
-interface KeyAlgorithm {
-    name: string;
-}
-
-interface KeyboardEventInit extends EventModifierInit {
-    code?: string;
-    key?: string;
-    location?: number;
-    repeat?: boolean;
-}
-
-interface LongRange {
-    max?: number;
-    min?: number;
-}
-
-interface MSAccountInfo {
-    accountImageUri?: string;
-    accountName?: string;
-    rpDisplayName: string;
-    userDisplayName: string;
-    userId?: string;
-}
-
-interface MSAudioLocalClientEvent extends MSLocalClientEventBase {
-    cpuInsufficientEventRatio?: number;
-    deviceCaptureNotFunctioningEventRatio?: number;
-    deviceClippingEventRatio?: number;
-    deviceEchoEventRatio?: number;
-    deviceGlitchesEventRatio?: number;
-    deviceHalfDuplexAECEventRatio?: number;
-    deviceHowlingEventCount?: number;
-    deviceLowSNREventRatio?: number;
-    deviceLowSpeechLevelEventRatio?: number;
-    deviceMultipleEndpointsEventCount?: number;
-    deviceNearEndToEchoRatioEventRatio?: number;
-    deviceRenderMuteEventRatio?: number;
-    deviceRenderNotFunctioningEventRatio?: number;
-    deviceRenderZeroVolumeEventRatio?: number;
-    networkDelayEventRatio?: number;
-    networkSendQualityEventRatio?: number;
-}
-
-interface MSAudioRecvPayload extends MSPayloadBase {
-    burstLossLength1?: number;
-    burstLossLength2?: number;
-    burstLossLength3?: number;
-    burstLossLength4?: number;
-    burstLossLength5?: number;
-    burstLossLength6?: number;
-    burstLossLength7?: number;
-    burstLossLength8OrHigher?: number;
-    fecRecvDistance1?: number;
-    fecRecvDistance2?: number;
-    fecRecvDistance3?: number;
-    packetReorderDepthAvg?: number;
-    packetReorderDepthMax?: number;
-    packetReorderRatio?: number;
-    ratioCompressedSamplesAvg?: number;
-    ratioConcealedSamplesAvg?: number;
-    ratioStretchedSamplesAvg?: number;
-    samplingRate?: number;
-    signal?: MSAudioRecvSignal;
-}
-
-interface MSAudioRecvSignal {
-    initialSignalLevelRMS?: number;
-    recvNoiseLevelCh1?: number;
-    recvSignalLevelCh1?: number;
-    renderLoopbackSignalLevel?: number;
-    renderNoiseLevel?: number;
-    renderSignalLevel?: number;
-}
-
-interface MSAudioSendPayload extends MSPayloadBase {
-    audioFECUsed?: boolean;
-    samplingRate?: number;
-    sendMutePercent?: number;
-    signal?: MSAudioSendSignal;
-}
-
-interface MSAudioSendSignal {
-    noiseLevel?: number;
-    sendNoiseLevelCh1?: number;
-    sendSignalLevelCh1?: number;
-}
-
-interface MSConnectivity {
-    iceType?: MSIceType;
-    iceWarningFlags?: MSIceWarningFlags;
-    relayAddress?: MSRelayAddress;
-}
-
-interface MSCredentialFilter {
-    accept?: MSCredentialSpec[];
-}
-
-interface MSCredentialParameters {
-    type?: MSCredentialType;
-}
-
-interface MSCredentialSpec {
-    id?: string;
-    type: MSCredentialType;
-}
-
-interface MSDCCEventInit extends EventInit {
-    maxFr?: number;
-    maxFs?: number;
-}
-
-interface MSDSHEventInit extends EventInit {
-    sources?: number[];
-    timestamp?: number;
-}
-
-interface MSDelay {
-    roundTrip?: number;
-    roundTripMax?: number;
-}
-
-interface MSDescription extends RTCStats {
-    connectivity?: MSConnectivity;
-    deviceDevName?: string;
-    localAddr?: MSIPAddressInfo;
-    networkconnectivity?: MSNetworkConnectivityInfo;
-    reflexiveLocalIPAddr?: MSIPAddressInfo;
-    remoteAddr?: MSIPAddressInfo;
-    transport?: RTCIceProtocol;
-}
-
-interface MSFIDOCredentialParameters extends MSCredentialParameters {
-    algorithm?: string | Algorithm;
-    authenticators?: string[];
-}
-
-interface MSIPAddressInfo {
-    ipAddr?: string;
-    manufacturerMacAddrMask?: string;
-    port?: number;
-}
-
-interface MSIceWarningFlags {
-    allocationMessageIntegrityFailed?: boolean;
-    alternateServerReceived?: boolean;
-    connCheckMessageIntegrityFailed?: boolean;
-    connCheckOtherError?: boolean;
-    fipsAllocationFailure?: boolean;
-    multipleRelayServersAttempted?: boolean;
-    noRelayServersConfigured?: boolean;
-    portRangeExhausted?: boolean;
-    pseudoTLSFailure?: boolean;
-    tcpNatConnectivityFailed?: boolean;
-    tcpRelayConnectivityFailed?: boolean;
-    turnAuthUnknownUsernameError?: boolean;
-    turnTcpAllocateFailed?: boolean;
-    turnTcpSendFailed?: boolean;
-    turnTcpTimedOut?: boolean;
-    turnTurnTcpConnectivityFailed?: boolean;
-    turnUdpAllocateFailed?: boolean;
-    turnUdpSendFailed?: boolean;
-    udpLocalConnectivityFailed?: boolean;
-    udpNatConnectivityFailed?: boolean;
-    udpRelayConnectivityFailed?: boolean;
-    useCandidateChecksFailed?: boolean;
-}
-
-interface MSJitter {
-    interArrival?: number;
-    interArrivalMax?: number;
-    interArrivalSD?: number;
-}
-
-interface MSLocalClientEventBase extends RTCStats {
-    networkBandwidthLowEventRatio?: number;
-    networkReceiveQualityEventRatio?: number;
-}
-
-interface MSNetwork extends RTCStats {
-    delay?: MSDelay;
-    jitter?: MSJitter;
-    packetLoss?: MSPacketLoss;
-    utilization?: MSUtilization;
-}
-
-interface MSNetworkConnectivityInfo {
-    linkspeed?: number;
-    networkConnectionDetails?: string;
-    vpn?: boolean;
-}
-
-interface MSNetworkInterfaceType {
-    interfaceTypeEthernet?: boolean;
-    interfaceTypePPP?: boolean;
-    interfaceTypeTunnel?: boolean;
-    interfaceTypeWWAN?: boolean;
-    interfaceTypeWireless?: boolean;
-}
-
-interface MSOutboundNetwork extends MSNetwork {
-    appliedBandwidthLimit?: number;
-}
-
-interface MSPacketLoss {
-    lossRate?: number;
-    lossRateMax?: number;
-}
-
-interface MSPayloadBase extends RTCStats {
-    payloadDescription?: string;
-}
-
-interface MSPortRange {
-    max?: number;
-    min?: number;
-}
-
-interface MSRelayAddress {
-    port?: number;
-    relayAddress?: string;
-}
-
-interface MSSignatureParameters {
-    userPrompt?: string;
-}
-
-interface MSTransportDiagnosticsStats extends RTCStats {
-    allocationTimeInMs?: number;
-    baseAddress?: string;
-    baseInterface?: MSNetworkInterfaceType;
-    iceRole?: RTCIceRole;
-    iceWarningFlags?: MSIceWarningFlags;
-    interfaces?: MSNetworkInterfaceType;
-    localAddrType?: MSIceAddrType;
-    localAddress?: string;
-    localInterface?: MSNetworkInterfaceType;
-    localMR?: string;
-    localMRTCPPort?: number;
-    localSite?: string;
-    msRtcEngineVersion?: string;
-    networkName?: string;
-    numConsentReqReceived?: number;
-    numConsentReqSent?: number;
-    numConsentRespReceived?: number;
-    numConsentRespSent?: number;
-    portRangeMax?: number;
-    portRangeMin?: number;
-    protocol?: RTCIceProtocol;
-    remoteAddrType?: MSIceAddrType;
-    remoteAddress?: string;
-    remoteMR?: string;
-    remoteMRTCPPort?: number;
-    remoteSite?: string;
-    rtpRtcpMux?: boolean;
-    stunVer?: number;
-}
-
-interface MSUtilization {
-    bandwidthEstimation?: number;
-    bandwidthEstimationAvg?: number;
-    bandwidthEstimationMax?: number;
-    bandwidthEstimationMin?: number;
-    bandwidthEstimationStdDev?: number;
-    packets?: number;
-}
-
-interface MSVideoPayload extends MSPayloadBase {
-    durationSeconds?: number;
-    resolution?: string;
-    videoBitRateAvg?: number;
-    videoBitRateMax?: number;
-    videoFrameRateAvg?: number;
-    videoPacketLossRate?: number;
-}
-
-interface MSVideoRecvPayload extends MSVideoPayload {
-    lowBitRateCallPercent?: number;
-    lowFrameRateCallPercent?: number;
-    recvBitRateAverage?: number;
-    recvBitRateMaximum?: number;
-    recvCodecType?: string;
-    recvFpsHarmonicAverage?: number;
-    recvFrameRateAverage?: number;
-    recvNumResSwitches?: number;
-    recvReorderBufferMaxSuccessfullyOrderedExtent?: number;
-    recvReorderBufferMaxSuccessfullyOrderedLateTime?: number;
-    recvReorderBufferPacketsDroppedDueToBufferExhaustion?: number;
-    recvReorderBufferPacketsDroppedDueToTimeout?: number;
-    recvReorderBufferReorderedPackets?: number;
-    recvResolutionHeight?: number;
-    recvResolutionWidth?: number;
-    recvVideoStreamsMax?: number;
-    recvVideoStreamsMin?: number;
-    recvVideoStreamsMode?: number;
-    reorderBufferTotalPackets?: number;
-    videoFrameLossRate?: number;
-    videoPostFECPLR?: number;
-    videoResolutions?: MSVideoResolutionDistribution;
-}
-
-interface MSVideoResolutionDistribution {
-    cifQuality?: number;
-    h1080Quality?: number;
-    h1440Quality?: number;
-    h2160Quality?: number;
-    h720Quality?: number;
-    vgaQuality?: number;
-}
-
-interface MSVideoSendPayload extends MSVideoPayload {
-    sendBitRateAverage?: number;
-    sendBitRateMaximum?: number;
-    sendFrameRateAverage?: number;
-    sendResolutionHeight?: number;
-    sendResolutionWidth?: number;
-    sendVideoStreamsMax?: number;
-}
-
-interface MediaElementAudioSourceOptions {
-    mediaElement: HTMLMediaElement;
-}
-
-interface MediaEncryptedEventInit extends EventInit {
-    initData?: ArrayBuffer | null;
-    initDataType?: string;
-}
-
-interface MediaKeyMessageEventInit extends EventInit {
-    message?: ArrayBuffer | null;
-    messageType?: MediaKeyMessageType;
-}
-
-interface MediaKeySystemConfiguration {
-    audioCapabilities?: MediaKeySystemMediaCapability[];
-    distinctiveIdentifier?: MediaKeysRequirement;
-    initDataTypes?: string[];
-    persistentState?: MediaKeysRequirement;
-    videoCapabilities?: MediaKeySystemMediaCapability[];
-}
-
-interface MediaKeySystemMediaCapability {
-    contentType?: string;
-    robustness?: string;
-}
-
-interface MediaStreamConstraints {
-    audio?: boolean | MediaTrackConstraints;
-    video?: boolean | MediaTrackConstraints;
-}
-
-interface MediaStreamErrorEventInit extends EventInit {
-    error?: MediaStreamError | null;
-}
-
-interface MediaStreamEventInit extends EventInit {
-    stream?: MediaStream;
-}
-
-interface MediaStreamTrackEventInit extends EventInit {
-    track?: MediaStreamTrack | null;
-}
-
-interface MediaTrackCapabilities {
-    aspectRatio?: number | DoubleRange;
-    deviceId?: string;
-    echoCancellation?: boolean[];
-    facingMode?: string;
-    frameRate?: number | DoubleRange;
-    groupId?: string;
-    height?: number | LongRange;
-    sampleRate?: number | LongRange;
-    sampleSize?: number | LongRange;
-    volume?: number | DoubleRange;
-    width?: number | LongRange;
-}
-
-interface MediaTrackConstraintSet {
-    aspectRatio?: number | ConstrainDoubleRange;
-    channelCount?: number | ConstrainLongRange;
-    deviceId?: string | string[] | ConstrainDOMStringParameters;
-    displaySurface?: string | string[] | ConstrainDOMStringParameters;
-    echoCancellation?: boolean | ConstrainBooleanParameters;
-    facingMode?: string | string[] | ConstrainDOMStringParameters;
-    frameRate?: number | ConstrainDoubleRange;
-    groupId?: string | string[] | ConstrainDOMStringParameters;
-    height?: number | ConstrainLongRange;
-    latency?: number | ConstrainDoubleRange;
-    logicalSurface?: boolean | ConstrainBooleanParameters;
-    sampleRate?: number | ConstrainLongRange;
-    sampleSize?: number | ConstrainLongRange;
-    volume?: number | ConstrainDoubleRange;
-    width?: number | ConstrainLongRange;
-}
-
-interface MediaTrackConstraints extends MediaTrackConstraintSet {
-    advanced?: MediaTrackConstraintSet[];
-}
-
-interface MediaTrackSettings {
-    aspectRatio?: number;
-    deviceId?: string;
-    echoCancellation?: boolean;
-    facingMode?: string;
-    frameRate?: number;
-    groupId?: string;
-    height?: number;
-    sampleRate?: number;
-    sampleSize?: number;
-    volume?: number;
-    width?: number;
-}
-
-interface MediaTrackSupportedConstraints {
-    aspectRatio?: boolean;
-    deviceId?: boolean;
-    echoCancellation?: boolean;
-    facingMode?: boolean;
-    frameRate?: boolean;
-    groupId?: boolean;
-    height?: boolean;
-    sampleRate?: boolean;
-    sampleSize?: boolean;
-    volume?: boolean;
-    width?: boolean;
-}
-
-interface MessageEventInit extends EventInit {
-    channel?: string;
-    data?: any;
-    lastEventId?: string;
-    origin?: string;
-    ports?: MessagePort[];
-    source?: Window | null;
-}
-
-interface MouseEventInit extends EventModifierInit {
-    button?: number;
-    buttons?: number;
-    clientX?: number;
-    clientY?: number;
-    relatedTarget?: EventTarget | null;
-    screenX?: number;
-    screenY?: number;
-}
-
-interface MsZoomToOptions {
-    animate?: string;
-    contentX?: number;
-    contentY?: number;
-    scaleFactor?: number;
-    viewportX?: string | null;
-    viewportY?: string | null;
-}
-
-interface MutationObserverInit {
-    attributeFilter?: string[];
-    attributeOldValue?: boolean;
-    attributes?: boolean;
-    characterData?: boolean;
-    characterDataOldValue?: boolean;
-    childList?: boolean;
-    subtree?: boolean;
-}
-
-interface NotificationEventInit extends ExtendableEventInit {
-    action?: string;
-    notification: Notification;
-}
-
-interface NotificationOptions {
-    body?: string;
-    data?: any;
-    dir?: NotificationDirection;
-    icon?: string;
-    lang?: string;
-    tag?: string;
-}
-
-interface ObjectURLOptions {
-    oneTimeOnly?: boolean;
-}
-
-interface OfflineAudioCompletionEventInit extends EventInit {
-    renderedBuffer: AudioBuffer;
-}
-
-interface OscillatorOptions extends AudioNodeOptions {
-    detune?: number;
-    frequency?: number;
-    periodicWave?: PeriodicWave;
-    type?: OscillatorType;
-}
-
-interface PannerOptions extends AudioNodeOptions {
-    coneInnerAngle?: number;
-    coneOuterAngle?: number;
-    coneOuterGain?: number;
-    distanceModel?: DistanceModelType;
-    maxDistance?: number;
-    orientationX?: number;
-    orientationY?: number;
-    orientationZ?: number;
-    panningModel?: PanningModelType;
-    positionX?: number;
-    positionY?: number;
-    positionZ?: number;
-    refDistance?: number;
-    rolloffFactor?: number;
-}
-
-interface PaymentCurrencyAmount {
-    currency: string;
-    currencySystem?: string;
-    value: string;
-}
-
-interface PaymentDetailsBase {
-    displayItems?: PaymentItem[];
-    modifiers?: PaymentDetailsModifier[];
-    shippingOptions?: PaymentShippingOption[];
-}
-
-interface PaymentDetailsInit extends PaymentDetailsBase {
-    id?: string;
-    total: PaymentItem;
-}
-
-interface PaymentDetailsModifier {
-    additionalDisplayItems?: PaymentItem[];
-    data?: any;
-    supportedMethods: string | string[];
-    total?: PaymentItem;
-}
-
-interface PaymentDetailsUpdate extends PaymentDetailsBase {
-    error?: string;
-    total?: PaymentItem;
-}
-
-interface PaymentItem {
-    amount: PaymentCurrencyAmount;
-    label: string;
-    pending?: boolean;
-}
-
-interface PaymentMethodData {
-    data?: any;
-    supportedMethods: string | string[];
-}
-
-interface PaymentOptions {
-    requestPayerEmail?: boolean;
-    requestPayerName?: boolean;
-    requestPayerPhone?: boolean;
-    requestShipping?: boolean;
-    shippingType?: string;
-}
-
-interface PaymentRequestUpdateEventInit extends EventInit {
-}
-
-interface PaymentShippingOption {
-    amount: PaymentCurrencyAmount;
-    id: string;
-    label: string;
-    selected?: boolean;
-}
-
-interface Pbkdf2Params extends Algorithm {
-    hash: string | Algorithm;
-    iterations: number;
-    salt: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-}
-
-interface PeriodicWaveConstraints {
-    disableNormalization?: boolean;
-}
-
-interface PeriodicWaveOptions extends PeriodicWaveConstraints {
-    imag?: number[];
-    real?: number[];
-}
-
-interface PointerEventInit extends MouseEventInit {
-    height?: number;
-    isPrimary?: boolean;
-    pointerId?: number;
-    pointerType?: string;
-    pressure?: number;
-    tiltX?: number;
-    tiltY?: number;
-    width?: number;
-}
-
-interface PopStateEventInit extends EventInit {
-    state?: any;
-}
-
-interface PositionOptions {
-    enableHighAccuracy?: boolean;
-    maximumAge?: number;
-    timeout?: number;
-}
-
-interface ProgressEventInit extends EventInit {
-    lengthComputable?: boolean;
-    loaded?: number;
-    total?: number;
-}
-
-interface PushEventInit extends ExtendableEventInit {
-    data?: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | string | null;
-}
-
-interface PushSubscriptionChangeInit extends ExtendableEventInit {
-    newSubscription?: PushSubscription;
-    oldSubscription?: PushSubscription;
-}
-
-interface PushSubscriptionOptionsInit {
-    applicationServerKey?: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | string | null;
-    userVisibleOnly?: boolean;
-}
-
-interface QueuingStrategy {
-    highWaterMark?: number;
-    size?: WritableStreamChunkCallback;
-}
-
-interface RTCConfiguration {
-    bundlePolicy?: RTCBundlePolicy;
-    iceServers?: RTCIceServer[];
-    iceTransportPolicy?: RTCIceTransportPolicy;
-    peerIdentity?: string;
-}
-
-interface RTCDTMFToneChangeEventInit extends EventInit {
-    tone?: string;
-}
-
-interface RTCDtlsFingerprint {
-    algorithm?: string;
-    value?: string;
-}
-
-interface RTCDtlsParameters {
-    fingerprints?: RTCDtlsFingerprint[];
-    role?: RTCDtlsRole;
-}
-
-interface RTCIceCandidateAttributes extends RTCStats {
-    addressSourceUrl?: string;
-    candidateType?: RTCStatsIceCandidateType;
-    ipAddress?: string;
-    portNumber?: number;
-    priority?: number;
-    transport?: string;
-}
-
-interface RTCIceCandidateComplete {
-}
-
-interface RTCIceCandidateDictionary {
-    foundation?: string;
-    ip?: string;
-    msMTurnSessionId?: string;
-    port?: number;
-    priority?: number;
-    protocol?: RTCIceProtocol;
-    relatedAddress?: string;
-    relatedPort?: number;
-    tcpType?: RTCIceTcpCandidateType;
-    type?: RTCIceCandidateType;
-}
-
-interface RTCIceCandidateInit {
-    candidate?: string;
-    sdpMLineIndex?: number;
-    sdpMid?: string;
-}
-
-interface RTCIceCandidatePair {
-    local?: RTCIceCandidateDictionary;
-    remote?: RTCIceCandidateDictionary;
-}
-
-interface RTCIceCandidatePairStats extends RTCStats {
-    availableIncomingBitrate?: number;
-    availableOutgoingBitrate?: number;
-    bytesReceived?: number;
-    bytesSent?: number;
-    localCandidateId?: string;
-    nominated?: boolean;
-    priority?: number;
-    readable?: boolean;
-    remoteCandidateId?: string;
-    roundTripTime?: number;
-    state?: RTCStatsIceCandidatePairState;
-    transportId?: string;
-    writable?: boolean;
-}
-
-interface RTCIceGatherOptions {
-    gatherPolicy?: RTCIceGatherPolicy;
-    iceservers?: RTCIceServer[];
-    portRange?: MSPortRange;
-}
-
-interface RTCIceParameters {
-    iceLite?: boolean | null;
-    password?: string;
-    usernameFragment?: string;
-}
-
-interface RTCIceServer {
-    credential?: string | null;
-    urls?: any;
-    username?: string | null;
-}
-
-interface RTCInboundRTPStreamStats extends RTCRTPStreamStats {
-    bytesReceived?: number;
-    fractionLost?: number;
-    jitter?: number;
-    packetsLost?: number;
-    packetsReceived?: number;
-}
-
-interface RTCMediaStreamTrackStats extends RTCStats {
-    audioLevel?: number;
-    echoReturnLoss?: number;
-    echoReturnLossEnhancement?: number;
-    frameHeight?: number;
-    frameWidth?: number;
-    framesCorrupted?: number;
-    framesDecoded?: number;
-    framesDropped?: number;
-    framesPerSecond?: number;
-    framesReceived?: number;
-    framesSent?: number;
-    remoteSource?: boolean;
-    ssrcIds?: string[];
-    trackIdentifier?: string;
-}
-
-interface RTCOfferOptions {
-    iceRestart?: boolean;
-    offerToReceiveAudio?: number;
-    offerToReceiveVideo?: number;
-    voiceActivityDetection?: boolean;
-}
-
-interface RTCOutboundRTPStreamStats extends RTCRTPStreamStats {
-    bytesSent?: number;
-    packetsSent?: number;
-    roundTripTime?: number;
-    targetBitrate?: number;
-}
-
-interface RTCPeerConnectionIceEventInit extends EventInit {
-    candidate?: RTCIceCandidate;
-}
-
-interface RTCRTPStreamStats extends RTCStats {
-    associateStatsId?: string;
-    codecId?: string;
-    firCount?: number;
-    isRemote?: boolean;
-    mediaTrackId?: string;
-    mediaType?: string;
-    nackCount?: number;
-    pliCount?: number;
-    sliCount?: number;
-    ssrc?: string;
-    transportId?: string;
-}
-
-interface RTCRtcpFeedback {
-    parameter?: string;
-    type?: string;
-}
-
-interface RTCRtcpParameters {
-    cname?: string;
-    mux?: boolean;
-    reducedSize?: boolean;
-    ssrc?: number;
-}
-
-interface RTCRtpCapabilities {
-    codecs?: RTCRtpCodecCapability[];
-    fecMechanisms?: string[];
-    headerExtensions?: RTCRtpHeaderExtension[];
-}
-
-interface RTCRtpCodecCapability {
-    clockRate?: number;
-    kind?: string;
-    maxSpatialLayers?: number;
-    maxTemporalLayers?: number;
-    maxptime?: number;
-    name?: string;
-    numChannels?: number;
-    options?: any;
-    parameters?: any;
-    preferredPayloadType?: number;
-    ptime?: number;
-    rtcpFeedback?: RTCRtcpFeedback[];
-    svcMultiStreamSupport?: boolean;
-}
-
-interface RTCRtpCodecParameters {
-    clockRate?: number;
-    maxptime?: number;
-    name?: string;
-    numChannels?: number;
-    parameters?: any;
-    payloadType?: number;
-    ptime?: number;
-    rtcpFeedback?: RTCRtcpFeedback[];
-}
-
-interface RTCRtpContributingSource {
-    audioLevel?: number;
-    csrc?: number;
-    timestamp?: number;
-}
-
-interface RTCRtpEncodingParameters {
-    active?: boolean;
-    codecPayloadType?: number;
-    dependencyEncodingIds?: string[];
-    encodingId?: string;
-    fec?: RTCRtpFecParameters;
-    framerateScale?: number;
-    maxBitrate?: number;
-    maxFramerate?: number;
-    minQuality?: number;
-    priority?: number;
-    resolutionScale?: number;
-    rtx?: RTCRtpRtxParameters;
-    ssrc?: number;
-    ssrcRange?: RTCSsrcRange;
-}
-
-interface RTCRtpFecParameters {
-    mechanism?: string;
-    ssrc?: number;
-}
-
-interface RTCRtpHeaderExtension {
-    kind?: string;
-    preferredEncrypt?: boolean;
-    preferredId?: number;
-    uri?: string;
-}
-
-interface RTCRtpHeaderExtensionParameters {
-    encrypt?: boolean;
-    id?: number;
-    uri?: string;
-}
-
-interface RTCRtpParameters {
-    codecs?: RTCRtpCodecParameters[];
-    degradationPreference?: RTCDegradationPreference;
-    encodings?: RTCRtpEncodingParameters[];
-    headerExtensions?: RTCRtpHeaderExtensionParameters[];
-    muxId?: string;
-    rtcp?: RTCRtcpParameters;
-}
-
-interface RTCRtpRtxParameters {
-    ssrc?: number;
-}
-
-interface RTCRtpUnhandled {
-    muxId?: string;
-    payloadType?: number;
-    ssrc?: number;
-}
-
-interface RTCSessionDescriptionInit {
-    sdp?: string;
-    type?: RTCSdpType;
-}
-
-interface RTCSrtpKeyParam {
-    keyMethod?: string;
-    keySalt?: string;
-    lifetime?: string;
-    mkiLength?: number;
-    mkiValue?: number;
-}
-
-interface RTCSrtpSdesParameters {
-    cryptoSuite?: string;
-    keyParams?: RTCSrtpKeyParam[];
-    sessionParams?: string[];
-    tag?: number;
-}
-
-interface RTCSsrcRange {
-    max?: number;
-    min?: number;
-}
-
-interface RTCStats {
-    id?: string;
-    msType?: MSStatsType;
-    timestamp?: number;
-    type?: RTCStatsType;
-}
-
-interface RTCStatsReport {
-}
-
-interface RTCTransportStats extends RTCStats {
-    activeConnection?: boolean;
-    bytesReceived?: number;
-    bytesSent?: number;
-    localCertificateId?: string;
-    remoteCertificateId?: string;
-    rtcpTransportStatsId?: string;
-    selectedCandidatePairId?: string;
-}
-
-interface RegistrationOptions {
-    scope?: string;
-}
-
-interface RequestInit {
-    body?: Blob | Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | FormData | string | null;
-    cache?: RequestCache;
-    credentials?: RequestCredentials;
-    headers?: HeadersInit;
-    integrity?: string;
-    keepalive?: boolean;
-    method?: string;
-    mode?: RequestMode;
-    redirect?: RequestRedirect;
-    referrer?: string;
-    referrerPolicy?: ReferrerPolicy;
-    signal?: AbortSignal;
-    window?: any;
-}
-
-interface ResponseInit {
-    headers?: HeadersInit;
-    status?: number;
-    statusText?: string;
-}
-
-interface RsaHashedImportParams extends Algorithm {
-    hash: string | Algorithm;
-}
-
-interface RsaHashedKeyAlgorithm extends RsaKeyAlgorithm {
-    hash: KeyAlgorithm;
-}
-
-interface RsaHashedKeyGenParams extends RsaKeyGenParams {
-    hash: string | Algorithm;
-}
-
-interface RsaKeyAlgorithm extends KeyAlgorithm {
-    modulusLength: number;
-    publicExponent: Uint8Array;
-}
-
-interface RsaKeyGenParams extends Algorithm {
-    modulusLength: number;
-    publicExponent: Uint8Array;
-}
-
-interface RsaOaepParams extends Algorithm {
-    label?: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-}
-
-interface RsaOtherPrimesInfo {
-    d?: string;
-    r?: string;
-    t?: string;
-}
-
-interface RsaPssParams extends Algorithm {
-    saltLength: number;
-}
-
-interface ScopedCredentialDescriptor {
-    id: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-    transports?: Transport[];
-    type: ScopedCredentialType;
-}
-
-interface ScopedCredentialOptions {
-    excludeList?: ScopedCredentialDescriptor[];
-    extensions?: WebAuthnExtensions;
-    rpId?: string;
-    timeoutSeconds?: number;
-}
-
-interface ScopedCredentialParameters {
-    algorithm: string | Algorithm;
-    type: ScopedCredentialType;
-}
-
-interface SecurityPolicyViolationEventInit extends EventInit {
-    blockedURI?: string;
-    columnNumber?: number;
-    documentURI?: string;
-    effectiveDirective?: string;
-    lineNumber?: number;
-    originalPolicy?: string;
-    referrer?: string;
-    sourceFile?: string;
-    statusCode?: number;
-    violatedDirective?: string;
-}
-
-interface ServiceWorkerMessageEventInit extends EventInit {
-    data?: any;
-    lastEventId?: string;
-    origin?: string;
-    ports?: MessagePort[] | null;
-    source?: ServiceWorker | MessagePort | null;
-}
-
-interface SpeechSynthesisEventInit extends EventInit {
-    charIndex?: number;
-    charLength?: number;
-    elapsedTime?: number;
-    name?: string;
-    utterance?: SpeechSynthesisUtterance | null;
-}
-
-interface StereoPannerOptions extends AudioNodeOptions {
-    pan?: number;
-}
-
-interface StoreExceptionsInformation extends ExceptionInformation {
-    detailURI?: string | null;
-    explanationString?: string | null;
-    siteName?: string | null;
-}
-
-interface StoreSiteSpecificExceptionsInformation extends StoreExceptionsInformation {
-    arrayOfDomainStrings?: string[];
-}
-
-interface SyncEventInit extends ExtendableEventInit {
-    lastChance?: boolean;
-    tag: string;
-}
-
-interface TextDecodeOptions {
-    stream?: boolean;
-}
-
-interface TextDecoderOptions {
-    fatal?: boolean;
-    ignoreBOM?: boolean;
-}
-
-interface TrackEventInit extends EventInit {
-    track?: VideoTrack | AudioTrack | TextTrack | null;
-}
-
-interface TransitionEventInit extends EventInit {
-    elapsedTime?: number;
-    propertyName?: string;
-}
-
-interface UIEventInit extends EventInit {
-    detail?: number;
-    view?: Window | null;
-}
-
-interface UnderlyingSink {
-    abort?: WritableStreamErrorCallback;
-    close?: WritableStreamDefaultControllerCallback;
-    start: WritableStreamDefaultControllerCallback;
-    write?: WritableStreamChunkCallback;
-}
-
-interface VRDisplayEventInit extends EventInit {
-    display: VRDisplay;
-    reason?: VRDisplayEventReason;
-}
-
-interface VRLayer {
-    leftBounds?: number[] | null;
-    rightBounds?: number[] | null;
-    source?: HTMLCanvasElement | null;
-}
-
-interface VRStageParameters {
-    sittingToStandingTransform?: Float32Array;
-    sizeX?: number;
-    sizeY?: number;
-}
-
-interface WaveShaperOptions extends AudioNodeOptions {
-    curve?: number[];
-    oversample?: OverSampleType;
-}
-
-interface WebAuthnExtensions {
-}
-
-interface WebGLContextAttributes {
-    alpha?: boolean;
-    antialias?: boolean;
-    depth?: boolean;
-    failIfMajorPerformanceCaveat?: boolean;
-    premultipliedAlpha?: boolean;
-    preserveDrawingBuffer?: boolean;
-    stencil?: boolean;
-}
-
-interface WebGLContextEventInit extends EventInit {
-    statusMessage?: string;
-}
-
-interface WheelEventInit extends MouseEventInit {
-    deltaMode?: number;
-    deltaX?: number;
-    deltaY?: number;
-    deltaZ?: number;
-}
-
-interface EventListener {
-    (evt: Event): void;
-}
-
-type WebKitEntriesCallback = ((entries: WebKitEntry[]) => void) | { handleEvent(entries: WebKitEntry[]): void; };
-
-type WebKitErrorCallback = ((err: DOMError) => void) | { handleEvent(err: DOMError): void; };
-
-type WebKitFileCallback = ((file: File) => void) | { handleEvent(file: File): void; };
-
-interface ANGLE_instanced_arrays {
-    drawArraysInstancedANGLE(mode: number, first: number, count: number, primcount: number): void;
-    drawElementsInstancedANGLE(mode: number, count: number, type: number, offset: number, primcount: number): void;
-    vertexAttribDivisorANGLE(index: number, divisor: number): void;
-    readonly VERTEX_ATTRIB_ARRAY_DIVISOR_ANGLE: number;
-}
-
-declare var ANGLE_instanced_arrays: {
-    prototype: ANGLE_instanced_arrays;
-    new(): ANGLE_instanced_arrays;
-    readonly VERTEX_ATTRIB_ARRAY_DIVISOR_ANGLE: number;
-};
-
-interface AbortController {
-    readonly signal: AbortSignal;
-    abort(): void;
-}
-
-declare var AbortController: {
-    prototype: AbortController;
-    new(): AbortController;
-};
-
-interface AbortSignalEventMap {
-    "abort": ProgressEvent;
-}
-
-interface AbortSignal extends EventTarget {
-    readonly aborted: boolean;
-    onabort: ((this: AbortSignal, ev: ProgressEvent) => any) | null;
-    addEventListener<K extends keyof AbortSignalEventMap>(type: K, listener: (this: AbortSignal, ev: AbortSignalEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof AbortSignalEventMap>(type: K, listener: (this: AbortSignal, ev: AbortSignalEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var AbortSignal: {
-    prototype: AbortSignal;
-    new(): AbortSignal;
-};
-
-interface AbstractWorkerEventMap {
-    "error": ErrorEvent;
-}
-
-interface AbstractWorker {
-    onerror: ((this: AbstractWorker, ev: ErrorEvent) => any) | null;
-    addEventListener<K extends keyof AbstractWorkerEventMap>(type: K, listener: (this: AbstractWorker, ev: AbstractWorkerEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof AbstractWorkerEventMap>(type: K, listener: (this: AbstractWorker, ev: AbstractWorkerEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-interface AesCfbParams extends Algorithm {
-    iv: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer;
-}
-
-interface AesCmacParams extends Algorithm {
-    length: number;
-}
-
-interface AnalyserNode extends AudioNode {
-    fftSize: number;
-    readonly frequencyBinCount: number;
-    maxDecibels: number;
-    minDecibels: number;
-    smoothingTimeConstant: number;
-    getByteFrequencyData(array: Uint8Array): void;
-    getByteTimeDomainData(array: Uint8Array): void;
-    getFloatFrequencyData(array: Float32Array): void;
-    getFloatTimeDomainData(array: Float32Array): void;
-}
-
-declare var AnalyserNode: {
-    prototype: AnalyserNode;
-    new(): AnalyserNode;
-};
-
-interface Animation {
-    currentTime: number | null;
-    effect: AnimationEffectReadOnly;
-    readonly finished: Promise<Animation>;
-    id: string;
-    readonly pending: boolean;
-    readonly playState: "idle" | "running" | "paused" | "finished";
-    playbackRate: number;
-    readonly ready: Promise<Animation>;
-    startTime: number;
-    timeline: AnimationTimeline;
-    cancel(): void;
-    finish(): void;
-    oncancel: (this: Animation, ev: AnimationPlaybackEvent) => any;
-    onfinish: (this: Animation, ev: AnimationPlaybackEvent) => any;
-    pause(): void;
-    play(): void;
-    reverse(): void;
-}
-
-declare var Animation: {
-    prototype: Animation;
-    new(effect?: AnimationEffectReadOnly, timeline?: AnimationTimeline): Animation;
-};
-
-interface AnimationEffectReadOnly {
-    readonly timing: number;
-    getComputedTiming(): ComputedTimingProperties;
-}
-
-interface AnimationEvent extends Event {
-    readonly animationName: string;
-    readonly elapsedTime: number;
-}
-
-declare var AnimationEvent: {
-    prototype: AnimationEvent;
-    new(typeArg: string, eventInitDict?: AnimationEventInit): AnimationEvent;
-};
-
-interface AnimationKeyFrame {
-    easing?: string | string[];
-    offset?: number | null | (number | null)[];
-    [index: string]: string | number | number[] | string[] | null | (number | null)[] | undefined;
-}
-
-interface AnimationOptions {
-    delay?: number;
-    direction?: "normal" | "reverse" | "alternate" | "alternate-reverse";
-    duration?: number;
-    easing?: string;
-    endDelay?: number;
-    fill?: "none" | "forwards" | "backwards" | "both"| "auto";
-    id?: string;
-    iterationStart?: number;
-    iterations?: number;
-}
-
-interface AnimationPlaybackEvent extends Event {
-    readonly currentTime: number | null;
-    readonly timelineTime: number | null;
-}
-
-declare var AnimationPlaybackEvent: {
-    prototype: AnimationPlaybackEvent;
-    new(type: string, eventInitDict?: AnimationPlaybackEventInit): AnimationPlaybackEvent;
-};
-
-interface AnimationPlaybackEventInit extends EventInit {
-    currentTime?: number | null;
-    timelineTime?: number | null;
-}
-
-interface AnimationTimeline {
-    readonly currentTime: number | null;
-}
-
-interface ApplicationCacheEventMap {
-    "cached": Event;
-    "checking": Event;
-    "downloading": Event;
-    "error": Event;
-    "noupdate": Event;
-    "obsolete": Event;
-    "progress": ProgressEvent;
-    "updateready": Event;
-}
-
-interface ApplicationCache extends EventTarget {
-    oncached: ((this: ApplicationCache, ev: Event) => any) | null;
-    onchecking: ((this: ApplicationCache, ev: Event) => any) | null;
-    ondownloading: ((this: ApplicationCache, ev: Event) => any) | null;
-    onerror: ((this: ApplicationCache, ev: Event) => any) | null;
-    onnoupdate: ((this: ApplicationCache, ev: Event) => any) | null;
-    onobsolete: ((this: ApplicationCache, ev: Event) => any) | null;
-    onprogress: ((this: ApplicationCache, ev: ProgressEvent) => any) | null;
-    onupdateready: ((this: ApplicationCache, ev: Event) => any) | null;
-    readonly status: number;
-    abort(): void;
-    swapCache(): void;
-    update(): void;
-    readonly CHECKING: number;
-    readonly DOWNLOADING: number;
-    readonly IDLE: number;
-    readonly OBSOLETE: number;
-    readonly UNCACHED: number;
-    readonly UPDATEREADY: number;
-    addEventListener<K extends keyof ApplicationCacheEventMap>(type: K, listener: (this: ApplicationCache, ev: ApplicationCacheEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof ApplicationCacheEventMap>(type: K, listener: (this: ApplicationCache, ev: ApplicationCacheEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var ApplicationCache: {
-    prototype: ApplicationCache;
-    new(): ApplicationCache;
-    readonly CHECKING: number;
-    readonly DOWNLOADING: number;
-    readonly IDLE: number;
-    readonly OBSOLETE: number;
-    readonly UNCACHED: number;
-    readonly UPDATEREADY: number;
-};
-
-interface AssignedNodesOptions {
-    flatten?: boolean;
-}
-
-interface Attr extends Node {
-    readonly name: string;
-    readonly ownerElement: Element | null;
-    readonly prefix: string | null;
-    readonly specified: boolean;
-    value: string;
-}
-
-declare var Attr: {
-    prototype: Attr;
-    new(): Attr;
-};
-
-interface AudioBuffer {
-    readonly duration: number;
-    readonly length: number;
-    readonly numberOfChannels: number;
-    readonly sampleRate: number;
-    copyFromChannel(destination: Float32Array, channelNumber: number, startInChannel?: number): void;
-    copyToChannel(source: Float32Array, channelNumber: number, startInChannel?: number): void;
-    getChannelData(channel: number): Float32Array;
-}
-
-declare var AudioBuffer: {
-    prototype: AudioBuffer;
-    new(): AudioBuffer;
-};
-
-interface AudioBufferSourceNodeEventMap {
-    "ended": Event;
-}
-
-interface AudioBufferSourceNode extends AudioNode {
-    buffer: AudioBuffer | null;
-    readonly detune: AudioParam;
-    loop: boolean;
-    loopEnd: number;
-    loopStart: number;
-    onended: ((this: AudioBufferSourceNode, ev: Event) => any) | null;
-    readonly playbackRate: AudioParam;
-    start(when?: number, offset?: number, duration?: number): void;
-    stop(when?: number): void;
-    addEventListener<K extends keyof AudioBufferSourceNodeEventMap>(type: K, listener: (this: AudioBufferSourceNode, ev: AudioBufferSourceNodeEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof AudioBufferSourceNodeEventMap>(type: K, listener: (this: AudioBufferSourceNode, ev: AudioBufferSourceNodeEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var AudioBufferSourceNode: {
-    prototype: AudioBufferSourceNode;
-    new(): AudioBufferSourceNode;
-};
-
-interface AudioContextEventMap {
-    "statechange": Event;
-}
-
-interface AudioContextBase extends EventTarget {
-    readonly currentTime: number;
-    readonly destination: AudioDestinationNode;
-    readonly listener: AudioListener;
-    onstatechange: ((this: AudioContext, ev: Event) => any) | null;
-    readonly sampleRate: number;
-    readonly state: AudioContextState;
-    close(): Promise<void>;
-    createAnalyser(): AnalyserNode;
-    createBiquadFilter(): BiquadFilterNode;
-    createBuffer(numberOfChannels: number, length: number, sampleRate: number): AudioBuffer;
-    createBufferSource(): AudioBufferSourceNode;
-    createChannelMerger(numberOfInputs?: number): ChannelMergerNode;
-    createChannelSplitter(numberOfOutputs?: number): ChannelSplitterNode;
-    createConvolver(): ConvolverNode;
-    createDelay(maxDelayTime?: number): DelayNode;
-    createDynamicsCompressor(): DynamicsCompressorNode;
-    createGain(): GainNode;
-    createIIRFilter(feedforward: number[], feedback: number[]): IIRFilterNode;
-    createMediaElementSource(mediaElement: HTMLMediaElement): MediaElementAudioSourceNode;
-    createMediaStreamSource(mediaStream: MediaStream): MediaStreamAudioSourceNode;
-    createOscillator(): OscillatorNode;
-    createPanner(): PannerNode;
-    createPeriodicWave(real: Float32Array, imag: Float32Array, constraints?: PeriodicWaveConstraints): PeriodicWave;
-    createScriptProcessor(bufferSize?: number, numberOfInputChannels?: number, numberOfOutputChannels?: number): ScriptProcessorNode;
-    createStereoPanner(): StereoPannerNode;
-    createWaveShaper(): WaveShaperNode;
-    decodeAudioData(audioData: ArrayBuffer, successCallback?: DecodeSuccessCallback, errorCallback?: DecodeErrorCallback): Promise<AudioBuffer>;
-    resume(): Promise<void>;
-    addEventListener<K extends keyof AudioContextEventMap>(type: K, listener: (this: AudioContext, ev: AudioContextEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof AudioContextEventMap>(type: K, listener: (this: AudioContext, ev: AudioContextEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-interface AudioContext extends AudioContextBase {
-    suspend(): Promise<void>;
-}
-
-declare var AudioContext: {
-    prototype: AudioContext;
-    new(): AudioContext;
-};
-
-interface AudioDestinationNode extends AudioNode {
-    readonly maxChannelCount: number;
-}
-
-declare var AudioDestinationNode: {
-    prototype: AudioDestinationNode;
-    new(): AudioDestinationNode;
-};
-
-interface AudioListener {
-    /** @deprecated */
-    dopplerFactor: number;
-    /** @deprecated */
-    speedOfSound: number;
-    /** @deprecated */
-    setOrientation(x: number, y: number, z: number, xUp: number, yUp: number, zUp: number): void;
-    /** @deprecated */
-    setPosition(x: number, y: number, z: number): void;
-    /** @deprecated */
-    setVelocity(x: number, y: number, z: number): void;
-}
-
-declare var AudioListener: {
-    prototype: AudioListener;
-    new(): AudioListener;
-};
-
-interface AudioNode extends EventTarget {
-    channelCount: number;
-    channelCountMode: ChannelCountMode;
-    channelInterpretation: ChannelInterpretation;
-    readonly context: AudioContext;
-    readonly numberOfInputs: number;
-    readonly numberOfOutputs: number;
-    connect(destination: AudioNode, output?: number, input?: number): AudioNode;
-    connect(destination: AudioParam, output?: number): void;
-    disconnect(): void;
-    disconnect(output: number): void;
-    disconnect(destination: AudioNode): void;
-    disconnect(destination: AudioNode, output: number): void;
-    disconnect(destination: AudioNode, output: number, input: number): void;
-    disconnect(destination: AudioParam): void;
-    disconnect(destination: AudioParam, output: number): void;
-}
-
-declare var AudioNode: {
-    prototype: AudioNode;
-    new(): AudioNode;
-};
-
-interface AudioParam {
-    readonly defaultValue: number;
-    value: number;
-    cancelScheduledValues(cancelTime: number): AudioParam;
-    exponentialRampToValueAtTime(value: number, endTime: number): AudioParam;
-    linearRampToValueAtTime(value: number, endTime: number): AudioParam;
-    setTargetAtTime(target: number, startTime: number, timeConstant: number): AudioParam;
-    setValueAtTime(value: number, startTime: number): AudioParam;
-    setValueCurveAtTime(values: number[], startTime: number, duration: number): AudioParam;
-}
-
-declare var AudioParam: {
-    prototype: AudioParam;
-    new(): AudioParam;
-};
-
-interface AudioProcessingEvent extends Event {
-    readonly inputBuffer: AudioBuffer;
-    readonly outputBuffer: AudioBuffer;
-    readonly playbackTime: number;
-}
-
-declare var AudioProcessingEvent: {
-    prototype: AudioProcessingEvent;
-    new(): AudioProcessingEvent;
-};
-
-interface AudioTrack {
-    enabled: boolean;
-    readonly id: string;
-    kind: string;
-    readonly label: string;
-    language: string;
-    readonly sourceBuffer: SourceBuffer;
-}
-
-declare var AudioTrack: {
-    prototype: AudioTrack;
-    new(): AudioTrack;
-};
-
-interface AudioTrackListEventMap {
-    "addtrack": TrackEvent;
-    "change": Event;
-    "removetrack": TrackEvent;
-}
-
-interface AudioTrackList extends EventTarget {
-    readonly length: number;
-    onaddtrack: ((this: AudioTrackList, ev: TrackEvent) => any) | null;
-    onchange: ((this: AudioTrackList, ev: Event) => any) | null;
-    onremovetrack: ((this: AudioTrackList, ev: TrackEvent) => any) | null;
-    getTrackById(id: string): AudioTrack | null;
-    item(index: number): AudioTrack;
-    addEventListener<K extends keyof AudioTrackListEventMap>(type: K, listener: (this: AudioTrackList, ev: AudioTrackListEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof AudioTrackListEventMap>(type: K, listener: (this: AudioTrackList, ev: AudioTrackListEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-    [index: number]: AudioTrack;
-}
-
-declare var AudioTrackList: {
-    prototype: AudioTrackList;
-    new(): AudioTrackList;
-};
-
-interface BarProp {
-    readonly visible: boolean;
-}
-
-declare var BarProp: {
-    prototype: BarProp;
-    new(): BarProp;
-};
-
-interface BeforeUnloadEvent extends Event {
-    returnValue: any;
-}
-
-declare var BeforeUnloadEvent: {
-    prototype: BeforeUnloadEvent;
-    new(): BeforeUnloadEvent;
-};
-
-interface BhxBrowser {
-    readonly lastError: DOMException;
-    checkMatchesGlobExpression(pattern: string, value: string): boolean;
-    checkMatchesUriExpression(pattern: string, value: string): boolean;
-    clearLastError(): void;
-    currentWindowId(): number;
-    fireExtensionApiTelemetry(functionName: string, isSucceeded: boolean, isSupported: boolean, errorString: string): void;
-    genericFunction(functionId: number, destination: any, parameters?: string, callbackId?: number): void;
-    genericSynchronousFunction(functionId: number, parameters?: string): string;
-    getExtensionId(): string;
-    getThisAddress(): any;
-    registerGenericFunctionCallbackHandler(callbackHandler: Function): void;
-    registerGenericListenerHandler(eventHandler: Function): void;
-    setLastError(parameters: string): void;
-    webPlatformGenericFunction(destination: any, parameters?: string, callbackId?: number): void;
-}
-
-declare var BhxBrowser: {
-    prototype: BhxBrowser;
-    new(): BhxBrowser;
-};
-
-interface BiquadFilterNode extends AudioNode {
-    readonly Q: AudioParam;
-    readonly detune: AudioParam;
-    readonly frequency: AudioParam;
-    readonly gain: AudioParam;
-    type: BiquadFilterType;
-    getFrequencyResponse(frequencyHz: Float32Array, magResponse: Float32Array, phaseResponse: Float32Array): void;
-}
-
-declare var BiquadFilterNode: {
-    prototype: BiquadFilterNode;
-    new(): BiquadFilterNode;
-};
-
-interface Blob {
-    readonly size: number;
-    readonly type: string;
-    msClose(): void;
-    msDetachStream(): any;
-    slice(start?: number, end?: number, contentType?: string): Blob;
-}
-
-declare var Blob: {
-    prototype: Blob;
-    new (blobParts?: any[], options?: BlobPropertyBag): Blob;
-};
-
-interface BlobPropertyBag {
-    endings?: string;
-    type?: string;
-}
-
-interface Body {
-    readonly bodyUsed: boolean;
-    arrayBuffer(): Promise<ArrayBuffer>;
-    blob(): Promise<Blob>;
-    formData(): Promise<FormData>;
-    json(): Promise<any>;
-    text(): Promise<string>;
-}
-
-interface BroadcastChannel extends EventTarget {
-    readonly name: string;
-    onmessage: (ev: MessageEvent) => any;
-    onmessageerror: (ev: MessageEvent) => any;
-    addEventListener<K extends keyof BroadcastChannelEventMap>(type: K, listener: (this: BroadcastChannel, ev: BroadcastChannelEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    close(): void;
-    postMessage(message: any): void;
-    removeEventListener<K extends keyof BroadcastChannelEventMap>(type: K, listener: (this: BroadcastChannel, ev: BroadcastChannelEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var BroadcastChannel: {
-    prototype: BroadcastChannel;
-    new(name: string): BroadcastChannel;
-};
-
-interface BroadcastChannelEventMap {
-    message: MessageEvent;
-    messageerror: MessageEvent;
-}
-
-interface ByteLengthQueuingStrategy {
-    highWaterMark: number;
-    size(chunk?: any): number;
-}
-
-declare var ByteLengthQueuingStrategy: {
-    prototype: ByteLengthQueuingStrategy;
-    new(strategy: QueuingStrategy): ByteLengthQueuingStrategy;
-};
-
-interface CDATASection extends Text {
-}
-
-declare var CDATASection: {
-    prototype: CDATASection;
-    new(): CDATASection;
-};
-
-interface CSS {
-    escape(value: string): string;
-    supports(property: string, value?: string): boolean;
-}
-declare var CSS: CSS;
-
-interface CSSConditionRule extends CSSGroupingRule {
-    conditionText: string;
-}
-
-declare var CSSConditionRule: {
-    prototype: CSSConditionRule;
-    new(): CSSConditionRule;
-};
-
-interface CSSFontFaceRule extends CSSRule {
-    readonly style: CSSStyleDeclaration;
-}
-
-declare var CSSFontFaceRule: {
-    prototype: CSSFontFaceRule;
-    new(): CSSFontFaceRule;
-};
-
-interface CSSGroupingRule extends CSSRule {
-    readonly cssRules: CSSRuleList;
-    deleteRule(index: number): void;
-    insertRule(rule: string, index: number): number;
-}
-
-declare var CSSGroupingRule: {
-    prototype: CSSGroupingRule;
-    new(): CSSGroupingRule;
-};
-
-interface CSSImportRule extends CSSRule {
-    readonly href: string;
-    readonly media: MediaList;
-    readonly styleSheet: CSSStyleSheet;
-}
-
-declare var CSSImportRule: {
-    prototype: CSSImportRule;
-    new(): CSSImportRule;
-};
-
-interface CSSKeyframeRule extends CSSRule {
-    keyText: string;
-    readonly style: CSSStyleDeclaration;
-}
-
-declare var CSSKeyframeRule: {
-    prototype: CSSKeyframeRule;
-    new(): CSSKeyframeRule;
-};
-
-interface CSSKeyframesRule extends CSSRule {
-    readonly cssRules: CSSRuleList;
-    name: string;
-    appendRule(rule: string): void;
-    deleteRule(rule: string): void;
-    findRule(rule: string): CSSKeyframeRule | null;
-}
-
-declare var CSSKeyframesRule: {
-    prototype: CSSKeyframesRule;
-    new(): CSSKeyframesRule;
-};
-
-interface CSSMediaRule extends CSSConditionRule {
-    readonly media: MediaList;
-}
-
-declare var CSSMediaRule: {
-    prototype: CSSMediaRule;
-    new(): CSSMediaRule;
-};
-
-interface CSSNamespaceRule extends CSSRule {
-    readonly namespaceURI: string;
-    readonly prefix: string;
-}
-
-declare var CSSNamespaceRule: {
-    prototype: CSSNamespaceRule;
-    new(): CSSNamespaceRule;
-};
-
-interface CSSPageRule extends CSSRule {
-    readonly pseudoClass: string;
-    readonly selector: string;
-    selectorText: string;
-    readonly style: CSSStyleDeclaration;
-}
-
-declare var CSSPageRule: {
-    prototype: CSSPageRule;
-    new(): CSSPageRule;
-};
-
-interface CSSRule {
-    cssText: string;
-    readonly parentRule: CSSRule | null;
-    readonly parentStyleSheet: CSSStyleSheet | null;
-    readonly type: number;
-    readonly CHARSET_RULE: number;
-    readonly FONT_FACE_RULE: number;
-    readonly IMPORT_RULE: number;
-    readonly KEYFRAMES_RULE: number;
-    readonly KEYFRAME_RULE: number;
-    readonly MEDIA_RULE: number;
-    readonly NAMESPACE_RULE: number;
-    readonly PAGE_RULE: number;
-    readonly STYLE_RULE: number;
-    readonly SUPPORTS_RULE: number;
-    readonly UNKNOWN_RULE: number;
-    readonly VIEWPORT_RULE: number;
-}
-
-declare var CSSRule: {
-    prototype: CSSRule;
-    new(): CSSRule;
-    readonly CHARSET_RULE: number;
-    readonly FONT_FACE_RULE: number;
-    readonly IMPORT_RULE: number;
-    readonly KEYFRAMES_RULE: number;
-    readonly KEYFRAME_RULE: number;
-    readonly MEDIA_RULE: number;
-    readonly NAMESPACE_RULE: number;
-    readonly PAGE_RULE: number;
-    readonly STYLE_RULE: number;
-    readonly SUPPORTS_RULE: number;
-    readonly UNKNOWN_RULE: number;
-    readonly VIEWPORT_RULE: number;
-};
-
-interface CSSRuleList {
-    readonly length: number;
-    item(index: number): CSSRule | null;
-    [index: number]: CSSRule;
-}
-
-declare var CSSRuleList: {
-    prototype: CSSRuleList;
-    new(): CSSRuleList;
-};
-
-interface CSSStyleDeclaration {
-    alignContent: string | null;
-    alignItems: string | null;
-    alignSelf: string | null;
-    alignmentBaseline: string | null;
-    animation: string | null;
-    animationDelay: string | null;
-    animationDirection: string | null;
-    animationDuration: string | null;
-    animationFillMode: string | null;
-    animationIterationCount: string | null;
-    animationName: string | null;
-    animationPlayState: string | null;
-    animationTimingFunction: string | null;
-    backfaceVisibility: string | null;
-    background: string | null;
-    backgroundAttachment: string | null;
-    backgroundClip: string | null;
-    backgroundColor: string | null;
-    backgroundImage: string | null;
-    backgroundOrigin: string | null;
-    backgroundPosition: string | null;
-    backgroundPositionX: string | null;
-    backgroundPositionY: string | null;
-    backgroundRepeat: string | null;
-    backgroundSize: string | null;
-    baselineShift: string | null;
-    border: string | null;
-    borderBottom: string | null;
-    borderBottomColor: string | null;
-    borderBottomLeftRadius: string | null;
-    borderBottomRightRadius: string | null;
-    borderBottomStyle: string | null;
-    borderBottomWidth: string | null;
-    borderCollapse: string | null;
-    borderColor: string | null;
-    borderImage: string | null;
-    borderImageOutset: string | null;
-    borderImageRepeat: string | null;
-    borderImageSlice: string | null;
-    borderImageSource: string | null;
-    borderImageWidth: string | null;
-    borderLeft: string | null;
-    borderLeftColor: string | null;
-    borderLeftStyle: string | null;
-    borderLeftWidth: string | null;
-    borderRadius: string | null;
-    borderRight: string | null;
-    borderRightColor: string | null;
-    borderRightStyle: string | null;
-    borderRightWidth: string | null;
-    borderSpacing: string | null;
-    borderStyle: string | null;
-    borderTop: string | null;
-    borderTopColor: string | null;
-    borderTopLeftRadius: string | null;
-    borderTopRightRadius: string | null;
-    borderTopStyle: string | null;
-    borderTopWidth: string | null;
-    borderWidth: string | null;
-    bottom: string | null;
-    boxShadow: string | null;
-    boxSizing: string | null;
-    breakAfter: string | null;
-    breakBefore: string | null;
-    breakInside: string | null;
-    captionSide: string | null;
-    clear: string | null;
-    clip: string | null;
-    clipPath: string | null;
-    clipRule: string | null;
-    color: string | null;
-    colorInterpolationFilters: string | null;
-    columnCount: any;
-    columnFill: string | null;
-    columnGap: any;
-    columnRule: string | null;
-    columnRuleColor: any;
-    columnRuleStyle: string | null;
-    columnRuleWidth: any;
-    columnSpan: string | null;
-    columnWidth: any;
-    columns: string | null;
-    content: string | null;
-    counterIncrement: string | null;
-    counterReset: string | null;
-    cssFloat: string | null;
-    cssText: string;
-    cursor: string | null;
-    direction: string | null;
-    display: string | null;
-    dominantBaseline: string | null;
-    emptyCells: string | null;
-    enableBackground: string | null;
-    fill: string | null;
-    fillOpacity: string | null;
-    fillRule: string | null;
-    filter: string | null;
-    flex: string | null;
-    flexBasis: string | null;
-    flexDirection: string | null;
-    flexFlow: string | null;
-    flexGrow: string | null;
-    flexShrink: string | null;
-    flexWrap: string | null;
-    floodColor: string | null;
-    floodOpacity: string | null;
-    font: string | null;
-    fontFamily: string | null;
-    fontFeatureSettings: string | null;
-    fontSize: string | null;
-    fontSizeAdjust: string | null;
-    fontStretch: string | null;
-    fontStyle: string | null;
-    fontVariant: string | null;
-    fontWeight: string | null;
-    gap: string | null;
-    glyphOrientationHorizontal: string | null;
-    glyphOrientationVertical: string | null;
-    grid: string | null;
-    gridArea: string | null;
-    gridAutoColumns: string | null;
-    gridAutoFlow: string | null;
-    gridAutoRows: string | null;
-    gridColumn: string | null;
-    gridColumnEnd: string | null;
-    gridColumnGap: string | null;
-    gridColumnStart: string | null;
-    gridGap: string | null;
-    gridRow: string | null;
-    gridRowEnd: string | null;
-    gridRowGap: string | null;
-    gridRowStart: string | null;
-    gridTemplate: string | null;
-    gridTemplateAreas: string | null;
-    gridTemplateColumns: string | null;
-    gridTemplateRows: string | null;
-    height: string | null;
-    imeMode: string | null;
-    justifyContent: string | null;
-    justifyItems: string | null;
-    justifySelf: string | null;
-    kerning: string | null;
-    layoutGrid: string | null;
-    layoutGridChar: string | null;
-    layoutGridLine: string | null;
-    layoutGridMode: string | null;
-    layoutGridType: string | null;
-    left: string | null;
-    readonly length: number;
-    letterSpacing: string | null;
-    lightingColor: string | null;
-    lineBreak: string | null;
-    lineHeight: string | null;
-    listStyle: string | null;
-    listStyleImage: string | null;
-    listStylePosition: string | null;
-    listStyleType: string | null;
-    margin: string | null;
-    marginBottom: string | null;
-    marginLeft: string | null;
-    marginRight: string | null;
-    marginTop: string | null;
-    marker: string | null;
-    markerEnd: string | null;
-    markerMid: string | null;
-    markerStart: string | null;
-    mask: string | null;
-    maskImage: string | null;
-    maxHeight: string | null;
-    maxWidth: string | null;
-    minHeight: string | null;
-    minWidth: string | null;
-    msContentZoomChaining: string | null;
-    msContentZoomLimit: string | null;
-    msContentZoomLimitMax: any;
-    msContentZoomLimitMin: any;
-    msContentZoomSnap: string | null;
-    msContentZoomSnapPoints: string | null;
-    msContentZoomSnapType: string | null;
-    msContentZooming: string | null;
-    msFlowFrom: string | null;
-    msFlowInto: string | null;
-    msFontFeatureSettings: string | null;
-    msGridColumn: any;
-    msGridColumnAlign: string | null;
-    msGridColumnSpan: any;
-    msGridColumns: string | null;
-    msGridRow: any;
-    msGridRowAlign: string | null;
-    msGridRowSpan: any;
-    msGridRows: string | null;
-    msHighContrastAdjust: string | null;
-    msHyphenateLimitChars: string | null;
-    msHyphenateLimitLines: any;
-    msHyphenateLimitZone: any;
-    msHyphens: string | null;
-    msImeAlign: string | null;
-    msOverflowStyle: string | null;
-    msScrollChaining: string | null;
-    msScrollLimit: string | null;
-    msScrollLimitXMax: any;
-    msScrollLimitXMin: any;
-    msScrollLimitYMax: any;
-    msScrollLimitYMin: any;
-    msScrollRails: string | null;
-    msScrollSnapPointsX: string | null;
-    msScrollSnapPointsY: string | null;
-    msScrollSnapType: string | null;
-    msScrollSnapX: string | null;
-    msScrollSnapY: string | null;
-    msScrollTranslation: string | null;
-    msTextCombineHorizontal: string | null;
-    msTextSizeAdjust: any;
-    msTouchAction: string | null;
-    msTouchSelect: string | null;
-    msUserSelect: string | null;
-    msWrapFlow: string;
-    msWrapMargin: any;
-    msWrapThrough: string;
-    objectFit: string | null;
-    objectPosition: string | null;
-    opacity: string | null;
-    order: string | null;
-    orphans: string | null;
-    outline: string | null;
-    outlineColor: string | null;
-    outlineOffset: string | null;
-    outlineStyle: string | null;
-    outlineWidth: string | null;
-    overflow: string | null;
-    overflowX: string | null;
-    overflowY: string | null;
-    padding: string | null;
-    paddingBottom: string | null;
-    paddingLeft: string | null;
-    paddingRight: string | null;
-    paddingTop: string | null;
-    pageBreakAfter: string | null;
-    pageBreakBefore: string | null;
-    pageBreakInside: string | null;
-    readonly parentRule: CSSRule;
-    penAction: string | null;
-    perspective: string | null;
-    perspectiveOrigin: string | null;
-    pointerEvents: string | null;
-    position: string | null;
-    quotes: string | null;
-    resize: string | null;
-    right: string | null;
-    rotate: string | null;
-    rowGap: string | null;
-    rubyAlign: string | null;
-    rubyOverhang: string | null;
-    rubyPosition: string | null;
-    scale: string | null;
-    stopColor: string | null;
-    stopOpacity: string | null;
-    stroke: string | null;
-    strokeDasharray: string | null;
-    strokeDashoffset: string | null;
-    strokeLinecap: string | null;
-    strokeLinejoin: string | null;
-    strokeMiterlimit: string | null;
-    strokeOpacity: string | null;
-    strokeWidth: string | null;
-    tableLayout: string | null;
-    textAlign: string | null;
-    textAlignLast: string | null;
-    textAnchor: string | null;
-    textCombineUpright: string | null;
-    textDecoration: string | null;
-    textIndent: string | null;
-    textJustify: string | null;
-    textKashida: string | null;
-    textKashidaSpace: string | null;
-    textOverflow: string | null;
-    textShadow: string | null;
-    textTransform: string | null;
-    textUnderlinePosition: string | null;
-    top: string | null;
-    touchAction: string | null;
-    transform: string | null;
-    transformOrigin: string | null;
-    transformStyle: string | null;
-    transition: string | null;
-    transitionDelay: string | null;
-    transitionDuration: string | null;
-    transitionProperty: string | null;
-    transitionTimingFunction: string | null;
-    translate: string | null;
-    unicodeBidi: string | null;
-    userSelect: string | null;
-    verticalAlign: string | null;
-    visibility: string | null;
-    webkitAlignContent: string | null;
-    webkitAlignItems: string | null;
-    webkitAlignSelf: string | null;
-    webkitAnimation: string | null;
-    webkitAnimationDelay: string | null;
-    webkitAnimationDirection: string | null;
-    webkitAnimationDuration: string | null;
-    webkitAnimationFillMode: string | null;
-    webkitAnimationIterationCount: string | null;
-    webkitAnimationName: string | null;
-    webkitAnimationPlayState: string | null;
-    webkitAnimationTimingFunction: string | null;
-    webkitAppearance: string | null;
-    webkitBackfaceVisibility: string | null;
-    webkitBackgroundClip: string | null;
-    webkitBackgroundOrigin: string | null;
-    webkitBackgroundSize: string | null;
-    webkitBorderBottomLeftRadius: string | null;
-    webkitBorderBottomRightRadius: string | null;
-    webkitBorderImage: string | null;
-    webkitBorderRadius: string | null;
-    webkitBorderTopLeftRadius: string | null;
-    webkitBorderTopRightRadius: string | null;
-    webkitBoxAlign: string | null;
-    webkitBoxDirection: string | null;
-    webkitBoxFlex: string | null;
-    webkitBoxOrdinalGroup: string | null;
-    webkitBoxOrient: string | null;
-    webkitBoxPack: string | null;
-    webkitBoxSizing: string | null;
-    webkitColumnBreakAfter: string | null;
-    webkitColumnBreakBefore: string | null;
-    webkitColumnBreakInside: string | null;
-    webkitColumnCount: any;
-    webkitColumnGap: any;
-    webkitColumnRule: string | null;
-    webkitColumnRuleColor: any;
-    webkitColumnRuleStyle: string | null;
-    webkitColumnRuleWidth: any;
-    webkitColumnSpan: string | null;
-    webkitColumnWidth: any;
-    webkitColumns: string | null;
-    webkitFilter: string | null;
-    webkitFlex: string | null;
-    webkitFlexBasis: string | null;
-    webkitFlexDirection: string | null;
-    webkitFlexFlow: string | null;
-    webkitFlexGrow: string | null;
-    webkitFlexShrink: string | null;
-    webkitFlexWrap: string | null;
-    webkitJustifyContent: string | null;
-    webkitOrder: string | null;
-    webkitPerspective: string | null;
-    webkitPerspectiveOrigin: string | null;
-    webkitTapHighlightColor: string | null;
-    webkitTextFillColor: string | null;
-    webkitTextSizeAdjust: any;
-    webkitTextStroke: string | null;
-    webkitTextStrokeColor: string | null;
-    webkitTextStrokeWidth: string | null;
-    webkitTransform: string | null;
-    webkitTransformOrigin: string | null;
-    webkitTransformStyle: string | null;
-    webkitTransition: string | null;
-    webkitTransitionDelay: string | null;
-    webkitTransitionDuration: string | null;
-    webkitTransitionProperty: string | null;
-    webkitTransitionTimingFunction: string | null;
-    webkitUserModify: string | null;
-    webkitUserSelect: string | null;
-    webkitWritingMode: string | null;
-    whiteSpace: string | null;
-    widows: string | null;
-    width: string | null;
-    wordBreak: string | null;
-    wordSpacing: string | null;
-    wordWrap: string | null;
-    writingMode: string | null;
-    zIndex: string | null;
-    zoom: string | null;
-    getPropertyPriority(propertyName: string): string;
-    getPropertyValue(propertyName: string): string;
-    item(index: number): string;
-    removeProperty(propertyName: string): string;
-    setProperty(propertyName: string, value: string | null, priority?: string | null): void;
-    [index: number]: string;
-}
-
-declare var CSSStyleDeclaration: {
-    prototype: CSSStyleDeclaration;
-    new(): CSSStyleDeclaration;
-};
-
-interface CSSStyleRule extends CSSRule {
-    selectorText: string;
-    readonly style: CSSStyleDeclaration;
-}
-
-declare var CSSStyleRule: {
-    prototype: CSSStyleRule;
-    new(): CSSStyleRule;
-};
-
-interface CSSStyleSheet extends StyleSheet {
-    readonly cssRules: CSSRuleList;
-    /** @deprecated */
-    cssText: string;
-    /** @deprecated */
-    readonly id: string;
-    /** @deprecated */
-    readonly imports: StyleSheetList;
-    /** @deprecated */
-    readonly isAlternate: boolean;
-    /** @deprecated */
-    readonly isPrefAlternate: boolean;
-    readonly ownerRule: CSSRule | null;
-    /** @deprecated */
-    readonly owningElement: Element;
-    /** @deprecated */
-    readonly pages: any;
-    /** @deprecated */
-    readonly readOnly: boolean;
-    readonly rules: CSSRuleList;
-    /** @deprecated */
-    addImport(bstrURL: string, lIndex?: number): number;
-    /** @deprecated */
-    addPageRule(bstrSelector: string, bstrStyle: string, lIndex?: number): number;
-    addRule(bstrSelector: string, bstrStyle?: string, lIndex?: number): number;
-    deleteRule(index?: number): void;
-    insertRule(rule: string, index?: number): number;
-    /** @deprecated */
-    removeImport(lIndex: number): void;
-    removeRule(lIndex: number): void;
-}
-
-declare var CSSStyleSheet: {
-    prototype: CSSStyleSheet;
-    new(): CSSStyleSheet;
-};
-
-interface CSSSupportsRule extends CSSConditionRule {
-}
-
-declare var CSSSupportsRule: {
-    prototype: CSSSupportsRule;
-    new(): CSSSupportsRule;
-};
-
-interface Cache {
-    add(request: Request | string): Promise<void>;
-    addAll(requests: (Request | string)[]): Promise<void>;
-    delete(request: Request | string, options?: CacheQueryOptions): Promise<boolean>;
-    keys(request?: Request | string, options?: CacheQueryOptions): Promise<Request[]>;
-    match(request: Request | string, options?: CacheQueryOptions): Promise<Response>;
-    matchAll(request?: Request | string, options?: CacheQueryOptions): Promise<Response[]>;
-    put(request: Request | string, response: Response): Promise<void>;
-}
-
-declare var Cache: {
-    prototype: Cache;
-    new(): Cache;
-};
-
-interface CacheStorage {
-    delete(cacheName: string): Promise<boolean>;
-    has(cacheName: string): Promise<boolean>;
-    keys(): Promise<string[]>;
-    match(request: Request | string, options?: CacheQueryOptions): Promise<any>;
-    open(cacheName: string): Promise<Cache>;
-}
-
-declare var CacheStorage: {
-    prototype: CacheStorage;
-    new(): CacheStorage;
-};
-
-interface Canvas2DContextAttributes {
-    alpha?: boolean;
-    storage?: boolean;
-    willReadFrequently?: boolean;
-    [attribute: string]: boolean | string | undefined;
-}
-
-interface CanvasGradient {
-    addColorStop(offset: number, color: string): void;
-}
-
-declare var CanvasGradient: {
-    prototype: CanvasGradient;
-    new(): CanvasGradient;
-};
-
-interface CanvasPathMethods {
-    arc(x: number, y: number, radius: number, startAngle: number, endAngle: number, anticlockwise?: boolean): void;
-    arcTo(x1: number, y1: number, x2: number, y2: number, radius: number): void;
-    arcTo(x1: number, y1: number, x2: number, y2: number, radiusX: number, radiusY: number, rotation: number): void;
-    bezierCurveTo(cp1x: number, cp1y: number, cp2x: number, cp2y: number, x: number, y: number): void;
-    closePath(): void;
-    ellipse(x: number, y: number, radiusX: number, radiusY: number, rotation: number, startAngle: number, endAngle: number, anticlockwise?: boolean): void;
-    lineTo(x: number, y: number): void;
-    moveTo(x: number, y: number): void;
-    quadraticCurveTo(cpx: number, cpy: number, x: number, y: number): void;
-    rect(x: number, y: number, w: number, h: number): void;
-}
-
-interface CanvasPattern {
-    setTransform(matrix: SVGMatrix): void;
-}
-
-declare var CanvasPattern: {
-    prototype: CanvasPattern;
-    new(): CanvasPattern;
-};
-
-interface CanvasRenderingContext2D extends CanvasPathMethods {
-    readonly canvas: HTMLCanvasElement;
-    fillStyle: string | CanvasGradient | CanvasPattern;
-    font: string;
-    globalAlpha: number;
-    globalCompositeOperation: string;
-    imageSmoothingEnabled: boolean;
-    lineCap: string;
-    lineDashOffset: number;
-    lineJoin: string;
-    lineWidth: number;
-    miterLimit: number;
-    mozImageSmoothingEnabled: boolean;
-    msFillRule: CanvasFillRule;
-    oImageSmoothingEnabled: boolean;
-    shadowBlur: number;
-    shadowColor: string;
-    shadowOffsetX: number;
-    shadowOffsetY: number;
-    strokeStyle: string | CanvasGradient | CanvasPattern;
-    textAlign: string;
-    textBaseline: string;
-    webkitImageSmoothingEnabled: boolean;
-    beginPath(): void;
-    clearRect(x: number, y: number, w: number, h: number): void;
-    clip(fillRule?: CanvasFillRule): void;
-    clip(path: Path2D, fillRule?: CanvasFillRule): void;
-    createImageData(imageDataOrSw: number | ImageData, sh?: number): ImageData;
-    createLinearGradient(x0: number, y0: number, x1: number, y1: number): CanvasGradient;
-    createPattern(image: HTMLImageElement | HTMLCanvasElement | HTMLVideoElement, repetition: string): CanvasPattern;
-    createRadialGradient(x0: number, y0: number, r0: number, x1: number, y1: number, r1: number): CanvasGradient;
-    drawFocusIfNeeded(element: Element): void;
-    drawFocusIfNeeded(path: Path2D, element: Element): void;
-    drawImage(image: HTMLImageElement | HTMLCanvasElement | HTMLVideoElement | ImageBitmap, dstX: number, dstY: number): void;
-    drawImage(image: HTMLImageElement | HTMLCanvasElement | HTMLVideoElement | ImageBitmap, dstX: number, dstY: number, dstW: number, dstH: number): void;
-    drawImage(image: HTMLImageElement | HTMLCanvasElement | HTMLVideoElement | ImageBitmap, srcX: number, srcY: number, srcW: number, srcH: number, dstX: number, dstY: number, dstW: number, dstH: number): void;
-    fill(fillRule?: CanvasFillRule): void;
-    fill(path: Path2D, fillRule?: CanvasFillRule): void;
-    fillRect(x: number, y: number, w: number, h: number): void;
-    fillText(text: string, x: number, y: number, maxWidth?: number): void;
-    getImageData(sx: number, sy: number, sw: number, sh: number): ImageData;
-    getLineDash(): number[];
-    isPointInPath(x: number, y: number, fillRule?: CanvasFillRule): boolean;
-    isPointInPath(path: Path2D, x: number, y: number, fillRule?: CanvasFillRule): boolean;
-    isPointInStroke(x: number, y: number, fillRule?: CanvasFillRule): boolean;
-    isPointInStroke(path: Path2D, x: number, y: number, fillRule?: CanvasFillRule): boolean;
-    measureText(text: string): TextMetrics;
-    putImageData(imagedata: ImageData, dx: number, dy: number, dirtyX?: number, dirtyY?: number, dirtyWidth?: number, dirtyHeight?: number): void;
-    restore(): void;
-    rotate(angle: number): void;
-    save(): void;
-    scale(x: number, y: number): void;
-    setLineDash(segments: number[]): void;
-    setTransform(m11: number, m12: number, m21: number, m22: number, dx: number, dy: number): void;
-    stroke(path?: Path2D): void;
-    strokeRect(x: number, y: number, w: number, h: number): void;
-    strokeText(text: string, x: number, y: number, maxWidth?: number): void;
-    transform(m11: number, m12: number, m21: number, m22: number, dx: number, dy: number): void;
-    translate(x: number, y: number): void;
-}
-
-declare var CanvasRenderingContext2D: {
-    prototype: CanvasRenderingContext2D;
-    new(): CanvasRenderingContext2D;
-};
-
-interface ChannelMergerNode extends AudioNode {
-}
-
-declare var ChannelMergerNode: {
-    prototype: ChannelMergerNode;
-    new(): ChannelMergerNode;
-};
-
-interface ChannelSplitterNode extends AudioNode {
-}
-
-declare var ChannelSplitterNode: {
-    prototype: ChannelSplitterNode;
-    new(): ChannelSplitterNode;
-};
-
-interface CharacterData extends Node, ChildNode {
-    data: string;
-    readonly length: number;
-    appendData(arg: string): void;
-    deleteData(offset: number, count: number): void;
-    insertData(offset: number, arg: string): void;
-    replaceData(offset: number, count: number, arg: string): void;
-    substringData(offset: number, count: number): string;
-}
-
-declare var CharacterData: {
-    prototype: CharacterData;
-    new(): CharacterData;
-};
-
-interface ChildNode {
-    remove(): void;
-}
-
-interface ClientRect {
-    bottom: number;
-    readonly height: number;
-    left: number;
-    right: number;
-    top: number;
-    readonly width: number;
-}
-
-declare var ClientRect: {
-    prototype: ClientRect;
-    new(): ClientRect;
-};
-
-interface ClientRectList {
-    readonly length: number;
-    item(index: number): ClientRect;
-    [index: number]: ClientRect;
-}
-
-declare var ClientRectList: {
-    prototype: ClientRectList;
-    new(): ClientRectList;
-};
-
-interface ClipboardEvent extends Event {
-    readonly clipboardData: DataTransfer;
-}
-
-declare var ClipboardEvent: {
-    prototype: ClipboardEvent;
-    new(type: string, eventInitDict?: ClipboardEventInit): ClipboardEvent;
-};
-
-interface ClipboardEventInit extends EventInit {
-    data?: string;
-    dataType?: string;
-}
-
-interface CloseEvent extends Event {
-    readonly code: number;
-    readonly reason: string;
-    readonly wasClean: boolean;
-    /** @deprecated */
-    initCloseEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, wasCleanArg: boolean, codeArg: number, reasonArg: string): void;
-}
-
-declare var CloseEvent: {
-    prototype: CloseEvent;
-    new(type: string, eventInitDict?: CloseEventInit): CloseEvent;
-};
-
-interface Comment extends CharacterData {
-    text: string;
-}
-
-declare var Comment: {
-    prototype: Comment;
-    new(data?: string): Comment;
-};
-
-interface CompositionEvent extends UIEvent {
-    readonly data: string;
-    readonly locale: string;
-    initCompositionEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, dataArg: string, locale: string): void;
-}
-
-declare var CompositionEvent: {
-    prototype: CompositionEvent;
-    new(typeArg: string, eventInitDict?: CompositionEventInit): CompositionEvent;
-};
-
-interface ComputedTimingProperties {
-    activeDuration: number;
-    currentIteration: number | null;
-    endTime: number;
-    localTime: number | null;
-    progress: number | null;
-}
-
-interface ConcatParams extends Algorithm {
-    algorithmId: Uint8Array;
-    hash?: string | Algorithm;
-    partyUInfo: Uint8Array;
-    partyVInfo: Uint8Array;
-    privateInfo?: Uint8Array;
-    publicInfo?: Uint8Array;
-}
-
-interface Console {
-    memory: any;
-    assert(condition?: boolean, message?: string, ...data: any[]): void;
-    clear(): void;
-    count(label?: string): void;
-    debug(message?: any, ...optionalParams: any[]): void;
-    dir(value?: any, ...optionalParams: any[]): void;
-    dirxml(value: any): void;
-    error(message?: any, ...optionalParams: any[]): void;
-    exception(message?: string, ...optionalParams: any[]): void;
-    group(groupTitle?: string, ...optionalParams: any[]): void;
-    groupCollapsed(groupTitle?: string, ...optionalParams: any[]): void;
-    groupEnd(): void;
-    info(message?: any, ...optionalParams: any[]): void;
-    log(message?: any, ...optionalParams: any[]): void;
-    markTimeline(label?: string): void;
-    msIsIndependentlyComposed(element: Element): boolean;
-    profile(reportName?: string): void;
-    profileEnd(): void;
-    select(element: Element): void;
-    table(...tabularData: any[]): void;
-    time(label?: string): void;
-    timeEnd(label?: string): void;
-    timeStamp(label?: string): void;
-    timeline(label?: string): void;
-    timelineEnd(label?: string): void;
-    trace(message?: any, ...optionalParams: any[]): void;
-    warn(message?: any, ...optionalParams: any[]): void;
-}
-
-declare var Console: {
-    prototype: Console;
-    new(): Console;
-};
-
-interface ContentScriptGlobalScope extends EventTarget {
-    readonly msContentScript: ExtensionScriptApis;
-    readonly window: Window;
-}
-
-declare var ContentScriptGlobalScope: {
-    prototype: ContentScriptGlobalScope;
-    new(): ContentScriptGlobalScope;
-};
-
-interface ConvolverNode extends AudioNode {
-    buffer: AudioBuffer | null;
-    normalize: boolean;
-}
-
-declare var ConvolverNode: {
-    prototype: ConvolverNode;
-    new(): ConvolverNode;
-};
-
-interface Coordinates {
-    readonly accuracy: number;
-    readonly altitude: number | null;
-    readonly altitudeAccuracy: number | null;
-    readonly heading: number | null;
-    readonly latitude: number;
-    readonly longitude: number;
-    readonly speed: number | null;
-}
-
-declare var Coordinates: {
-    prototype: Coordinates;
-    new(): Coordinates;
-};
-
-interface CountQueuingStrategy {
-    highWaterMark: number;
-    size(): number;
-}
-
-declare var CountQueuingStrategy: {
-    prototype: CountQueuingStrategy;
-    new(strategy: QueuingStrategy): CountQueuingStrategy;
-};
-
-interface Crypto {
-    readonly subtle: SubtleCrypto;
-    getRandomValues(array: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | null): Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | null;
-}
-
-declare var Crypto: {
-    prototype: Crypto;
-    new(): Crypto;
-};
-
-interface CryptoKey {
-    readonly algorithm: KeyAlgorithm;
-    readonly extractable: boolean;
-    readonly type: string;
-    readonly usages: string[];
-}
-
-declare var CryptoKey: {
-    prototype: CryptoKey;
-    new(): CryptoKey;
-};
-
-interface CryptoKeyPair {
-    privateKey: CryptoKey;
-    publicKey: CryptoKey;
-}
-
-declare var CryptoKeyPair: {
-    prototype: CryptoKeyPair;
-    new(): CryptoKeyPair;
-};
-
-interface CustomElementRegistry {
-    define(name: string, constructor: Function, options?: ElementDefinitionOptions): void;
-    get(name: string): any;
-    whenDefined(name: string): PromiseLike<void>;
-}
-
-interface CustomEvent<T = any> extends Event {
-    readonly detail: T;
-    initCustomEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, detailArg: T): void;
-}
-
-declare var CustomEvent: {
-    prototype: CustomEvent;
-    new<T>(typeArg: string, eventInitDict?: CustomEventInit<T>): CustomEvent<T>;
-};
-
-interface DOMError {
-    readonly name: string;
-    toString(): string;
-}
-
-declare var DOMError: {
-    prototype: DOMError;
-    new(): DOMError;
-};
-
-interface DOMException {
-    readonly code: number;
-    readonly message: string;
-    readonly name: string;
-    toString(): string;
-    readonly ABORT_ERR: number;
-    readonly DATA_CLONE_ERR: number;
-    readonly DOMSTRING_SIZE_ERR: number;
-    readonly HIERARCHY_REQUEST_ERR: number;
-    readonly INDEX_SIZE_ERR: number;
-    readonly INUSE_ATTRIBUTE_ERR: number;
-    readonly INVALID_ACCESS_ERR: number;
-    readonly INVALID_CHARACTER_ERR: number;
-    readonly INVALID_MODIFICATION_ERR: number;
-    readonly INVALID_NODE_TYPE_ERR: number;
-    readonly INVALID_STATE_ERR: number;
-    readonly NAMESPACE_ERR: number;
-    readonly NETWORK_ERR: number;
-    readonly NOT_FOUND_ERR: number;
-    readonly NOT_SUPPORTED_ERR: number;
-    readonly NO_DATA_ALLOWED_ERR: number;
-    readonly NO_MODIFICATION_ALLOWED_ERR: number;
-    readonly PARSE_ERR: number;
-    readonly QUOTA_EXCEEDED_ERR: number;
-    readonly SECURITY_ERR: number;
-    readonly SERIALIZE_ERR: number;
-    readonly SYNTAX_ERR: number;
-    readonly TIMEOUT_ERR: number;
-    readonly TYPE_MISMATCH_ERR: number;
-    readonly URL_MISMATCH_ERR: number;
-    readonly VALIDATION_ERR: number;
-    readonly WRONG_DOCUMENT_ERR: number;
-}
-
-declare var DOMException: {
-    prototype: DOMException;
-    new(message?: string, name?: string): DOMException;
-    readonly ABORT_ERR: number;
-    readonly DATA_CLONE_ERR: number;
-    readonly DOMSTRING_SIZE_ERR: number;
-    readonly HIERARCHY_REQUEST_ERR: number;
-    readonly INDEX_SIZE_ERR: number;
-    readonly INUSE_ATTRIBUTE_ERR: number;
-    readonly INVALID_ACCESS_ERR: number;
-    readonly INVALID_CHARACTER_ERR: number;
-    readonly INVALID_MODIFICATION_ERR: number;
-    readonly INVALID_NODE_TYPE_ERR: number;
-    readonly INVALID_STATE_ERR: number;
-    readonly NAMESPACE_ERR: number;
-    readonly NETWORK_ERR: number;
-    readonly NOT_FOUND_ERR: number;
-    readonly NOT_SUPPORTED_ERR: number;
-    readonly NO_DATA_ALLOWED_ERR: number;
-    readonly NO_MODIFICATION_ALLOWED_ERR: number;
-    readonly PARSE_ERR: number;
-    readonly QUOTA_EXCEEDED_ERR: number;
-    readonly SECURITY_ERR: number;
-    readonly SERIALIZE_ERR: number;
-    readonly SYNTAX_ERR: number;
-    readonly TIMEOUT_ERR: number;
-    readonly TYPE_MISMATCH_ERR: number;
-    readonly URL_MISMATCH_ERR: number;
-    readonly VALIDATION_ERR: number;
-    readonly WRONG_DOCUMENT_ERR: number;
-};
-
-interface DOMImplementation {
-    createDocument(namespaceURI: string | null, qualifiedName: string | null, doctype: DocumentType | null): Document;
-    createDocumentType(qualifiedName: string, publicId: string, systemId: string): DocumentType;
-    createHTMLDocument(title?: string): Document;
-    hasFeature(feature: string | null, version: string | null): boolean;
-}
-
-declare var DOMImplementation: {
-    prototype: DOMImplementation;
-    new(): DOMImplementation;
-};
-
-interface DOML2DeprecatedColorProperty {
-    color: string;
-}
-
-interface DOML2DeprecatedSizeProperty {
-    size: number;
-}
-
-interface DOMParser {
-    parseFromString(source: string, mimeType: string): Document;
-}
-
-declare var DOMParser: {
-    prototype: DOMParser;
-    new(): DOMParser;
-};
-
-interface DOMRect extends DOMRectReadOnly {
-    height: number;
-    width: number;
-    x: number;
-    y: number;
-}
-
-declare var DOMRect: {
-    prototype: DOMRect;
-    new (x?: number, y?: number, width?: number, height?: number): DOMRect;
-    fromRect(rectangle?: DOMRectInit): DOMRect;
-};
-
-interface DOMRectList {
-    readonly length: number;
-    item(index: number): DOMRect | null;
-    [index: number]: DOMRect;
-}
-
-interface DOMRectReadOnly {
-    readonly bottom: number;
-    readonly height: number;
-    readonly left: number;
-    readonly right: number;
-    readonly top: number;
-    readonly width: number;
-    readonly x: number;
-    readonly y: number;
-}
-
-declare var DOMRectReadOnly: {
-    prototype: DOMRectReadOnly;
-    new (x?: number, y?: number, width?: number, height?: number): DOMRectReadOnly;
-    fromRect(rectangle?: DOMRectInit): DOMRectReadOnly;
-};
-
-interface DOMSettableTokenList extends DOMTokenList {
-    value: string;
-}
-
-declare var DOMSettableTokenList: {
-    prototype: DOMSettableTokenList;
-    new(): DOMSettableTokenList;
-};
-
-interface DOMStringList {
-    readonly length: number;
-    contains(str: string): boolean;
-    item(index: number): string | null;
-    [index: number]: string;
-}
-
-declare var DOMStringList: {
-    prototype: DOMStringList;
-    new(): DOMStringList;
-};
-
-interface DOMStringMap {
-    [name: string]: string | undefined;
-}
-
-declare var DOMStringMap: {
-    prototype: DOMStringMap;
-    new(): DOMStringMap;
-};
-
-interface DOMTokenList {
-    readonly length: number;
-    add(...tokens: string[]): void;
-    contains(token: string): boolean;
-    item(index: number): string | null;
-    remove(...tokens: string[]): void;
-    replace(oldToken: string, newToken: string): void;
-    toString(): string;
-    toggle(token: string, force?: boolean): boolean;
-    [index: number]: string;
-}
-
-declare var DOMTokenList: {
-    prototype: DOMTokenList;
-    new(): DOMTokenList;
-};
-
-interface DataCue extends TextTrackCue {
-    data: ArrayBuffer;
-    addEventListener<K extends keyof TextTrackCueEventMap>(type: K, listener: (this: DataCue, ev: TextTrackCueEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof TextTrackCueEventMap>(type: K, listener: (this: DataCue, ev: TextTrackCueEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var DataCue: {
-    prototype: DataCue;
-    new(): DataCue;
-};
-
-interface DataTransfer {
-    dropEffect: string;
-    effectAllowed: string;
-    readonly files: FileList;
-    readonly items: DataTransferItemList;
-    readonly types: string[];
-    clearData(format?: string): boolean;
-    getData(format: string): string;
-    setData(format: string, data: string): boolean;
-    setDragImage(image: Element, x: number, y: number): void;
-}
-
-declare var DataTransfer: {
-    prototype: DataTransfer;
-    new(): DataTransfer;
-};
-
-interface DataTransferItem {
-    readonly kind: string;
-    readonly type: string;
-    getAsFile(): File | null;
-    getAsString(_callback: FunctionStringCallback | null): void;
-    webkitGetAsEntry(): any;
-}
-
-declare var DataTransferItem: {
-    prototype: DataTransferItem;
-    new(): DataTransferItem;
-};
-
-interface DataTransferItemList {
-    readonly length: number;
-    add(data: File): DataTransferItem | null;
-    add(data: string, type: string): DataTransferItem | null;
-    clear(): void;
-    item(index: number): DataTransferItem;
-    remove(index: number): void;
-    [name: number]: DataTransferItem;
-}
-
-declare var DataTransferItemList: {
-    prototype: DataTransferItemList;
-    new(): DataTransferItemList;
-};
-
-interface DeferredPermissionRequest {
-    readonly id: number;
-    readonly type: MSWebViewPermissionType;
-    readonly uri: string;
-    allow(): void;
-    deny(): void;
-}
-
-declare var DeferredPermissionRequest: {
-    prototype: DeferredPermissionRequest;
-    new(): DeferredPermissionRequest;
-};
-
-interface DelayNode extends AudioNode {
-    readonly delayTime: AudioParam;
-}
-
-declare var DelayNode: {
-    prototype: DelayNode;
-    new(): DelayNode;
-};
-
-interface DeviceAcceleration {
-    readonly x: number | null;
-    readonly y: number | null;
-    readonly z: number | null;
-}
-
-declare var DeviceAcceleration: {
-    prototype: DeviceAcceleration;
-    new(): DeviceAcceleration;
-};
-
-interface DeviceLightEvent extends Event {
-    readonly value: number;
-}
-
-declare var DeviceLightEvent: {
-    prototype: DeviceLightEvent;
-    new(typeArg: string, eventInitDict?: DeviceLightEventInit): DeviceLightEvent;
-};
-
-interface DeviceMotionEvent extends Event {
-    readonly acceleration: DeviceAcceleration | null;
-    readonly accelerationIncludingGravity: DeviceAcceleration | null;
-    readonly interval: number | null;
-    readonly rotationRate: DeviceRotationRate | null;
-    initDeviceMotionEvent(type: string, bubbles: boolean, cancelable: boolean, acceleration: DeviceAccelerationDict | null, accelerationIncludingGravity: DeviceAccelerationDict | null, rotationRate: DeviceRotationRateDict | null, interval: number | null): void;
-}
-
-declare var DeviceMotionEvent: {
-    prototype: DeviceMotionEvent;
-    new(typeArg: string, eventInitDict?: DeviceMotionEventInit): DeviceMotionEvent;
-};
-
-interface DeviceOrientationEvent extends Event {
-    readonly absolute: boolean;
-    readonly alpha: number | null;
-    readonly beta: number | null;
-    readonly gamma: number | null;
-    initDeviceOrientationEvent(type: string, bubbles: boolean, cancelable: boolean, alpha: number | null, beta: number | null, gamma: number | null, absolute: boolean): void;
-}
-
-declare var DeviceOrientationEvent: {
-    prototype: DeviceOrientationEvent;
-    new(typeArg: string, eventInitDict?: DeviceOrientationEventInit): DeviceOrientationEvent;
-};
-
-interface DeviceRotationRate {
-    readonly alpha: number | null;
-    readonly beta: number | null;
-    readonly gamma: number | null;
-}
-
-declare var DeviceRotationRate: {
-    prototype: DeviceRotationRate;
-    new(): DeviceRotationRate;
-};
-
-interface DhImportKeyParams extends Algorithm {
-    generator: Uint8Array;
-    prime: Uint8Array;
-}
-
-interface DhKeyAlgorithm extends KeyAlgorithm {
-    generator: Uint8Array;
-    prime: Uint8Array;
-}
-
-interface DhKeyDeriveParams extends Algorithm {
-    public: CryptoKey;
-}
-
-interface DhKeyGenParams extends Algorithm {
-    generator: Uint8Array;
-    prime: Uint8Array;
-}
-
-interface DocumentEventMap extends GlobalEventHandlersEventMap {
-    "abort": UIEvent;
-    "activate": Event;
-    "beforeactivate": Event;
-    "beforedeactivate": Event;
-    "blur": FocusEvent;
-    "canplay": Event;
-    "canplaythrough": Event;
-    "change": Event;
-    "click": MouseEvent;
-    "contextmenu": PointerEvent;
-    "dblclick": MouseEvent;
-    "deactivate": Event;
-    "drag": DragEvent;
-    "dragend": DragEvent;
-    "dragenter": DragEvent;
-    "dragleave": DragEvent;
-    "dragover": DragEvent;
-    "dragstart": DragEvent;
-    "drop": DragEvent;
-    "durationchange": Event;
-    "emptied": Event;
-    "ended": Event;
-    "error": ErrorEvent;
-    "focus": FocusEvent;
-    "fullscreenchange": Event;
-    "fullscreenerror": Event;
-    "input": Event;
-    "invalid": Event;
-    "keydown": KeyboardEvent;
-    "keypress": KeyboardEvent;
-    "keyup": KeyboardEvent;
-    "load": Event;
-    "loadeddata": Event;
-    "loadedmetadata": Event;
-    "loadstart": Event;
-    "mousedown": MouseEvent;
-    "mousemove": MouseEvent;
-    "mouseout": MouseEvent;
-    "mouseover": MouseEvent;
-    "mouseup": MouseEvent;
-    "mousewheel": WheelEvent;
-    "MSContentZoom": Event;
-    "MSGestureChange": Event;
-    "MSGestureDoubleTap": Event;
-    "MSGestureEnd": Event;
-    "MSGestureHold": Event;
-    "MSGestureStart": Event;
-    "MSGestureTap": Event;
-    "MSInertiaStart": Event;
-    "MSManipulationStateChanged": Event;
-    "MSPointerCancel": Event;
-    "MSPointerDown": Event;
-    "MSPointerEnter": Event;
-    "MSPointerLeave": Event;
-    "MSPointerMove": Event;
-    "MSPointerOut": Event;
-    "MSPointerOver": Event;
-    "MSPointerUp": Event;
-    "mssitemodejumplistitemremoved": Event;
-    "msthumbnailclick": Event;
-    "pause": Event;
-    "play": Event;
-    "playing": Event;
-    "pointerlockchange": Event;
-    "pointerlockerror": Event;
-    "progress": ProgressEvent;
-    "ratechange": Event;
-    "readystatechange": Event;
-    "reset": Event;
-    "scroll": UIEvent;
-    "seeked": Event;
-    "seeking": Event;
-    "select": UIEvent;
-    "selectionchange": Event;
-    "selectstart": Event;
-    "stalled": Event;
-    "stop": Event;
-    "submit": Event;
-    "suspend": Event;
-    "timeupdate": Event;
-    "touchcancel": TouchEvent;
-    "touchend": TouchEvent;
-    "touchmove": TouchEvent;
-    "touchstart": TouchEvent;
-    "volumechange": Event;
-    "waiting": Event;
-    "webkitfullscreenchange": Event;
-    "webkitfullscreenerror": Event;
-}
-
-interface Document extends Node, GlobalEventHandlers, ParentNode, DocumentEvent {
-    /**
-     * Sets or gets the URL for the current document.
-     */
-    readonly URL: string;
-    /**
-     * Gets the URL for the document, stripped of any character encoding.
-     */
-    readonly URLUnencoded: string;
-    /**
-     * Gets the object that has the focus when the parent document has focus.
-     */
-    readonly activeElement: Element;
-    /**
-     * Sets or gets the color of all active links in the document.
-     */
-    alinkColor: string;
-    /**
-     * Returns a reference to the collection of elements contained by the object.
-     */
-    readonly all: HTMLAllCollection;
-    /**
-     * Retrieves a collection of all a objects that have a name and/or id property. Objects in this collection are in HTML source order.
-     */
-    readonly anchors: HTMLCollectionOf<HTMLAnchorElement>;
-    /**
-     * Retrieves a collection of all applet objects in the document.
-     */
-    readonly applets: HTMLCollectionOf<HTMLAppletElement>;
-    /**
-     * Deprecated. Sets or retrieves a value that indicates the background color behind the object.
-     */
-    bgColor: string;
-    /**
-     * Specifies the beginning and end of the document body.
-     */
-    body: HTMLElement;
-    readonly characterSet: string;
-    /**
-     * Gets or sets the character set used to encode the object.
-     */
-    charset: string;
-    /**
-     * Gets a value that indicates whether standards-compliant mode is switched on for the object.
-     */
-    readonly compatMode: string;
-    cookie: string;
-    readonly currentScript: HTMLScriptElement | SVGScriptElement | null;
-    readonly defaultView: Window;
-    /**
-     * Sets or gets a value that indicates whether the document can be edited.
-     */
-    designMode: string;
-    /**
-     * Sets or retrieves a value that indicates the reading order of the object.
-     */
-    dir: string;
-    /**
-     * Gets an object representing the document type declaration associated with the current document.
-     */
-    readonly doctype: DocumentType;
-    /**
-     * Gets a reference to the root node of the document.
-     */
-    readonly documentElement: HTMLElement;
-    /**
-     * Sets or gets the security domain of the document.
-     */
-    domain: string;
-    /**
-     * Retrieves a collection of all embed objects in the document.
-     */
-    readonly embeds: HTMLCollectionOf<HTMLEmbedElement>;
-    /**
-     * Sets or gets the foreground (text) color of the document.
-     */
-    fgColor: string;
-    /**
-     * Retrieves a collection, in source order, of all form objects in the document.
-     */
-    readonly forms: HTMLCollectionOf<HTMLFormElement>;
-    readonly fullscreenElement: Element | null;
-    readonly fullscreenEnabled: boolean;
-    readonly head: HTMLHeadElement;
-    readonly hidden: boolean;
-    /**
-     * Retrieves a collection, in source order, of img objects in the document.
-     */
-    readonly images: HTMLCollectionOf<HTMLImageElement>;
-    /**
-     * Gets the implementation object of the current document.
-     */
-    readonly implementation: DOMImplementation;
-    /**
-     * Returns the character encoding used to create the webpage that is loaded into the document object.
-     */
-    readonly inputEncoding: string | null;
-    /**
-     * Gets the date that the page was last modified, if the page supplies one.
-     */
-    readonly lastModified: string;
-    /**
-     * Sets or gets the color of the document links.
-     */
-    linkColor: string;
-    /**
-     * Retrieves a collection of all a objects that specify the href property and all area objects in the document.
-     */
-    readonly links: HTMLCollectionOf<HTMLAnchorElement | HTMLAreaElement>;
-    /**
-     * Contains information about the current URL.
-     */
-    location: Location;
-    msCSSOMElementFloatMetrics: boolean;
-    msCapsLockWarningOff: boolean;
-    /**
-     * Fires when the user aborts the download.
-     * @param ev The event.
-     */
-    onabort: ((this: Document, ev: UIEvent) => any) | null;
-    /**
-     * Fires when the object is set as the active element.
-     * @param ev The event.
-     */
-    onactivate: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires immediately before the object is set as the active element.
-     * @param ev The event.
-     */
-    onbeforeactivate: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires immediately before the activeElement is changed from the current object to another object in the parent document.
-     * @param ev The event.
-     */
-    onbeforedeactivate: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the object loses the input focus.
-     * @param ev The focus event.
-     */
-    onblur: ((this: Document, ev: FocusEvent) => any) | null;
-    /**
-     * Occurs when playback is possible, but would require further buffering.
-     * @param ev The event.
-     */
-    oncanplay: ((this: Document, ev: Event) => any) | null;
-    oncanplaythrough: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the contents of the object or selection have changed.
-     * @param ev The event.
-     */
-    onchange: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the user clicks the left mouse button on the object
-     * @param ev The mouse event.
-     */
-    onclick: ((this: Document, ev: MouseEvent) => any) | null;
-    /**
-     * Fires when the user clicks the right mouse button in the client area, opening the context menu.
-     * @param ev The mouse event.
-     */
-    oncontextmenu: ((this: Document, ev: PointerEvent) => any) | null;
-    /**
-     * Fires when the user double-clicks the object.
-     * @param ev The mouse event.
-     */
-    ondblclick: ((this: Document, ev: MouseEvent) => any) | null;
-    /**
-     * Fires when the activeElement is changed from the current object to another object in the parent document.
-     * @param ev The UI Event
-     */
-    ondeactivate: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires on the source object continuously during a drag operation.
-     * @param ev The event.
-     */
-    ondrag: ((this: Document, ev: DragEvent) => any) | null;
-    /**
-     * Fires on the source object when the user releases the mouse at the close of a drag operation.
-     * @param ev The event.
-     */
-    ondragend: ((this: Document, ev: DragEvent) => any) | null;
-    /**
-     * Fires on the target element when the user drags the object to a valid drop target.
-     * @param ev The drag event.
-     */
-    ondragenter: ((this: Document, ev: DragEvent) => any) | null;
-    /**
-     * Fires on the target object when the user moves the mouse out of a valid drop target during a drag operation.
-     * @param ev The drag event.
-     */
-    ondragleave: ((this: Document, ev: DragEvent) => any) | null;
-    /**
-     * Fires on the target element continuously while the user drags the object over a valid drop target.
-     * @param ev The event.
-     */
-    ondragover: ((this: Document, ev: DragEvent) => any) | null;
-    /**
-     * Fires on the source object when the user starts to drag a text selection or selected object.
-     * @param ev The event.
-     */
-    ondragstart: ((this: Document, ev: DragEvent) => any) | null;
-    ondrop: ((this: Document, ev: DragEvent) => any) | null;
-    /**
-     * Occurs when the duration attribute is updated.
-     * @param ev The event.
-     */
-    ondurationchange: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when the media element is reset to its initial state.
-     * @param ev The event.
-     */
-    onemptied: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when the end of playback is reached.
-     * @param ev The event
-     */
-    onended: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when an error occurs during object loading.
-     * @param ev The event.
-     */
-    onerror: ((this: Document, ev: ErrorEvent) => any) | null;
-    /**
-     * Fires when the object receives focus.
-     * @param ev The event.
-     */
-    onfocus: ((this: Document, ev: FocusEvent) => any) | null;
-    onfullscreenchange: ((this: Document, ev: Event) => any) | null;
-    onfullscreenerror: ((this: Document, ev: Event) => any) | null;
-    oninput: ((this: Document, ev: Event) => any) | null;
-    oninvalid: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the user presses a key.
-     * @param ev The keyboard event
-     */
-    onkeydown: ((this: Document, ev: KeyboardEvent) => any) | null;
-    /**
-     * Fires when the user presses an alphanumeric key.
-     * @param ev The event.
-     */
-    onkeypress: ((this: Document, ev: KeyboardEvent) => any) | null;
-    /**
-     * Fires when the user releases a key.
-     * @param ev The keyboard event
-     */
-    onkeyup: ((this: Document, ev: KeyboardEvent) => any) | null;
-    /**
-     * Fires immediately after the browser loads the object.
-     * @param ev The event.
-     */
-    onload: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when media data is loaded at the current playback position.
-     * @param ev The event.
-     */
-    onloadeddata: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when the duration and dimensions of the media have been determined.
-     * @param ev The event.
-     */
-    onloadedmetadata: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when Internet Explorer begins looking for media data.
-     * @param ev The event.
-     */
-    onloadstart: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the user clicks the object with either mouse button.
-     * @param ev The mouse event.
-     */
-    onmousedown: ((this: Document, ev: MouseEvent) => any) | null;
-    /**
-     * Fires when the user moves the mouse over the object.
-     * @param ev The mouse event.
-     */
-    onmousemove: ((this: Document, ev: MouseEvent) => any) | null;
-    /**
-     * Fires when the user moves the mouse pointer outside the boundaries of the object.
-     * @param ev The mouse event.
-     */
-    onmouseout: ((this: Document, ev: MouseEvent) => any) | null;
-    /**
-     * Fires when the user moves the mouse pointer into the object.
-     * @param ev The mouse event.
-     */
-    onmouseover: ((this: Document, ev: MouseEvent) => any) | null;
-    /**
-     * Fires when the user releases a mouse button while the mouse is over the object.
-     * @param ev The mouse event.
-     */
-    onmouseup: ((this: Document, ev: MouseEvent) => any) | null;
-    /**
-     * Fires when the wheel button is rotated.
-     * @param ev The mouse event
-     */
-    onmousewheel: ((this: Document, ev: WheelEvent) => any) | null;
-    onmscontentzoom: ((this: Document, ev: Event) => any) | null;
-    onmsgesturechange: ((this: Document, ev: Event) => any) | null;
-    onmsgesturedoubletap: ((this: Document, ev: Event) => any) | null;
-    onmsgestureend: ((this: Document, ev: Event) => any) | null;
-    onmsgesturehold: ((this: Document, ev: Event) => any) | null;
-    onmsgesturestart: ((this: Document, ev: Event) => any) | null;
-    onmsgesturetap: ((this: Document, ev: Event) => any) | null;
-    onmsinertiastart: ((this: Document, ev: Event) => any) | null;
-    onmsmanipulationstatechanged: ((this: Document, ev: Event) => any) | null;
-    onmspointercancel: ((this: Document, ev: Event) => any) | null;
-    onmspointerdown: ((this: Document, ev: Event) => any) | null;
-    onmspointerenter: ((this: Document, ev: Event) => any) | null;
-    onmspointerleave: ((this: Document, ev: Event) => any) | null;
-    onmspointermove: ((this: Document, ev: Event) => any) | null;
-    onmspointerout: ((this: Document, ev: Event) => any) | null;
-    onmspointerover: ((this: Document, ev: Event) => any) | null;
-    onmspointerup: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when an item is removed from a Jump List of a webpage running in Site Mode.
-     * @param ev The event.
-     */
-    onmssitemodejumplistitemremoved: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when a user clicks a button in a Thumbnail Toolbar of a webpage running in Site Mode.
-     * @param ev The event.
-     */
-    onmsthumbnailclick: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when playback is paused.
-     * @param ev The event.
-     */
-    onpause: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when the play method is requested.
-     * @param ev The event.
-     */
-    onplay: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when the audio or video has started playing.
-     * @param ev The event.
-     */
-    onplaying: ((this: Document, ev: Event) => any) | null;
-    onpointerlockchange: ((this: Document, ev: Event) => any) | null;
-    onpointerlockerror: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs to indicate progress while downloading media data.
-     * @param ev The event.
-     */
-    onprogress: ((this: Document, ev: ProgressEvent) => any) | null;
-    /**
-     * Occurs when the playback rate is increased or decreased.
-     * @param ev The event.
-     */
-    onratechange: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the state of the object has changed.
-     * @param ev The event
-     */
-    onreadystatechange: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the user resets a form.
-     * @param ev The event.
-     */
-    onreset: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the user repositions the scroll box in the scroll bar on the object.
-     * @param ev The event.
-     */
-    onscroll: ((this: Document, ev: UIEvent) => any) | null;
-    /**
-     * Occurs when the seek operation ends.
-     * @param ev The event.
-     */
-    onseeked: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when the current playback position is moved.
-     * @param ev The event.
-     */
-    onseeking: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the current selection changes.
-     * @param ev The event.
-     */
-    onselect: ((this: Document, ev: UIEvent) => any) | null;
-    /**
-     * Fires when the selection state of a document changes.
-     * @param ev The event.
-     */
-    onselectionchange: ((this: Document, ev: Event) => any) | null;
-    onselectstart: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when the download has stopped.
-     * @param ev The event.
-     */
-    onstalled: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the user clicks the Stop button or leaves the Web page.
-     * @param ev The event.
-     */
-    onstop: ((this: Document, ev: Event) => any) | null;
-    onsubmit: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs if the load operation has been intentionally halted.
-     * @param ev The event.
-     */
-    onsuspend: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs to indicate the current playback position.
-     * @param ev The event.
-     */
-    ontimeupdate: ((this: Document, ev: Event) => any) | null;
-    ontouchcancel: ((this: Document, ev: TouchEvent) => any) | null;
-    ontouchend: ((this: Document, ev: TouchEvent) => any) | null;
-    ontouchmove: ((this: Document, ev: TouchEvent) => any) | null;
-    ontouchstart: ((this: Document, ev: TouchEvent) => any) | null;
-    onvisibilitychange: (this: Document, ev: Event) => any;
-    /**
-     * Occurs when the volume is changed, or playback is muted or unmuted.
-     * @param ev The event.
-     */
-    onvolumechange: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when playback stops because the next frame of a video resource is not available.
-     * @param ev The event.
-     */
-    onwaiting: ((this: Document, ev: Event) => any) | null;
-    onwebkitfullscreenchange: ((this: Document, ev: Event) => any) | null;
-    onwebkitfullscreenerror: ((this: Document, ev: Event) => any) | null;
-    readonly plugins: HTMLCollectionOf<HTMLEmbedElement>;
-    readonly pointerLockElement: Element;
-    /**
-     * Retrieves a value that indicates the current state of the object.
-     */
-    readonly readyState: DocumentReadyState;
-    /**
-     * Gets the URL of the location that referred the user to the current page.
-     */
-    readonly referrer: string;
-    /**
-     * Gets the root svg element in the document hierarchy.
-     */
-    readonly rootElement: SVGSVGElement;
-    /**
-     * Retrieves a collection of all script objects in the document.
-     */
-    readonly scripts: HTMLCollectionOf<HTMLScriptElement>;
-    readonly scrollingElement: Element | null;
-    /**
-     * Retrieves a collection of styleSheet objects representing the style sheets that correspond to each instance of a link or style object in the document.
-     */
-    readonly styleSheets: StyleSheetList;
-    /**
-     * Contains the title of the document.
-     */
-    title: string;
-    readonly visibilityState: VisibilityState;
-    /**
-     * Sets or gets the color of the links that the user has visited.
-     */
-    vlinkColor: string;
-    readonly webkitCurrentFullScreenElement: Element | null;
-    readonly webkitFullscreenElement: Element | null;
-    readonly webkitFullscreenEnabled: boolean;
-    readonly webkitIsFullScreen: boolean;
-    readonly xmlEncoding: string | null;
-    xmlStandalone: boolean;
-    /**
-     * Gets or sets the version attribute specified in the declaration of an XML document.
-     */
-    xmlVersion: string | null;
-    adoptNode<T extends Node>(source: T): T;
-    captureEvents(): void;
-    caretRangeFromPoint(x: number, y: number): Range;
-    clear(): void;
-    /**
-     * Closes an output stream and forces the sent data to display.
-     */
-    close(): void;
-    /**
-     * Creates an attribute object with a specified name.
-     * @param name String that sets the attribute object's name.
-     */
-    createAttribute(name: string): Attr;
-    createAttributeNS(namespaceURI: string | null, qualifiedName: string): Attr;
-    createCDATASection(data: string): CDATASection;
-    /**
-     * Creates a comment object with the specified data.
-     * @param data Sets the comment object's data.
-     */
-    createComment(data: string): Comment;
-    /**
-     * Creates a new document.
-     */
-    createDocumentFragment(): DocumentFragment;
-    /**
-     * Creates an instance of the element for the specified tag.
-     * @param tagName The name of an element.
-     */
-    createElement<K extends keyof HTMLElementTagNameMap>(tagName: K, options?: ElementCreationOptions): HTMLElementTagNameMap[K];
-    createElement(tagName: string, options?: ElementCreationOptions): HTMLElement;
-    createElementNS(namespaceURI: "http://www.w3.org/1999/xhtml", qualifiedName: string): HTMLElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "a"): SVGAElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "circle"): SVGCircleElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "clipPath"): SVGClipPathElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "componentTransferFunction"): SVGComponentTransferFunctionElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "defs"): SVGDefsElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "desc"): SVGDescElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "ellipse"): SVGEllipseElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feBlend"): SVGFEBlendElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feColorMatrix"): SVGFEColorMatrixElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feComponentTransfer"): SVGFEComponentTransferElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feComposite"): SVGFECompositeElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feConvolveMatrix"): SVGFEConvolveMatrixElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feDiffuseLighting"): SVGFEDiffuseLightingElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feDisplacementMap"): SVGFEDisplacementMapElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feDistantLight"): SVGFEDistantLightElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feFlood"): SVGFEFloodElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feFuncA"): SVGFEFuncAElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feFuncB"): SVGFEFuncBElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feFuncG"): SVGFEFuncGElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feFuncR"): SVGFEFuncRElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feGaussianBlur"): SVGFEGaussianBlurElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feImage"): SVGFEImageElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feMerge"): SVGFEMergeElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feMergeNode"): SVGFEMergeNodeElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feMorphology"): SVGFEMorphologyElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feOffset"): SVGFEOffsetElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "fePointLight"): SVGFEPointLightElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feSpecularLighting"): SVGFESpecularLightingElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feSpotLight"): SVGFESpotLightElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feTile"): SVGFETileElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feTurbulence"): SVGFETurbulenceElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "filter"): SVGFilterElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "foreignObject"): SVGForeignObjectElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "g"): SVGGElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "image"): SVGImageElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "gradient"): SVGGradientElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "line"): SVGLineElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "linearGradient"): SVGLinearGradientElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "marker"): SVGMarkerElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "mask"): SVGMaskElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "path"): SVGPathElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "metadata"): SVGMetadataElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "pattern"): SVGPatternElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "polygon"): SVGPolygonElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "polyline"): SVGPolylineElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "radialGradient"): SVGRadialGradientElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "rect"): SVGRectElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "svg"): SVGSVGElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "script"): SVGScriptElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "stop"): SVGStopElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "style"): SVGStyleElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "switch"): SVGSwitchElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "symbol"): SVGSymbolElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "tspan"): SVGTSpanElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "textContent"): SVGTextContentElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "text"): SVGTextElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "textPath"): SVGTextPathElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "textPositioning"): SVGTextPositioningElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "title"): SVGTitleElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "use"): SVGUseElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "view"): SVGViewElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: string): SVGElement;
-    createElementNS(namespaceURI: string | null, qualifiedName: string): Element;
-    createExpression(expression: string, resolver: XPathNSResolver): XPathExpression;
-    createNSResolver(nodeResolver: Node): XPathNSResolver;
-    /**
-     * Creates a NodeIterator object that you can use to traverse filtered lists of nodes or elements in a document.
-     * @param root The root element or node to start traversing on.
-     * @param whatToShow The type of nodes or elements to appear in the node list
-     * @param filter A custom NodeFilter function to use. For more information, see filter. Use null for no filter.
-     * @param entityReferenceExpansion A flag that specifies whether entity reference nodes are expanded.
-     */
-    createNodeIterator(root: Node, whatToShow?: number, filter?: NodeFilter, entityReferenceExpansion?: boolean): NodeIterator;
-    createProcessingInstruction(target: string, data: string): ProcessingInstruction;
-    /**
-     *  Returns an empty range object that has both of its boundary points positioned at the beginning of the document.
-     */
-    createRange(): Range;
-    /**
-     * Creates a text string from the specified value.
-     * @param data String that specifies the nodeValue property of the text node.
-     */
-    createTextNode(data: string): Text;
-    createTouch(view: Window, target: EventTarget, identifier: number, pageX: number, pageY: number, screenX: number, screenY: number): Touch;
-    createTouchList(...touches: Touch[]): TouchList;
-    /**
-     * Creates a TreeWalker object that you can use to traverse filtered lists of nodes or elements in a document.
-     * @param root The root element or node to start traversing on.
-     * @param whatToShow The type of nodes or elements to appear in the node list. For more information, see whatToShow.
-     * @param filter A custom NodeFilter function to use.
-     * @param entityReferenceExpansion A flag that specifies whether entity reference nodes are expanded.
-     */
-    createTreeWalker(root: Node, whatToShow?: number, filter?: NodeFilter, entityReferenceExpansion?: boolean): TreeWalker;
-    /**
-     * Returns the element for the specified x coordinate and the specified y coordinate.
-     * @param x The x-offset
-     * @param y The y-offset
-     */
-    elementFromPoint(x: number, y: number): Element;
-    elementsFromPoint(x: number, y: number): Element[];
-    evaluate(expression: string, contextNode: Node, resolver: XPathNSResolver | null, type: number, result: XPathResult | null): XPathResult;
-    /**
-     * Executes a command on the current document, current selection, or the given range.
-     * @param commandId String that specifies the command to execute. This command can be any of the command identifiers that can be executed in script.
-     * @param showUI Display the user interface, defaults to false.
-     * @param value Value to assign.
-     */
-    execCommand(commandId: string, showUI?: boolean, value?: any): boolean;
-    /**
-     * Displays help information for the given command identifier.
-     * @param commandId Displays help information for the given command identifier.
-     */
-    execCommandShowHelp(commandId: string): boolean;
-    exitFullscreen(): void;
-    exitPointerLock(): void;
-    /**
-     * Causes the element to receive the focus and executes the code specified by the onfocus event.
-     */
-    /** @deprecated */
-    focus(): void;
-    /**
-     * Returns a reference to the first object with the specified value of the ID or NAME attribute.
-     * @param elementId String that specifies the ID value. Case-insensitive.
-     */
-    getElementById(elementId: string): HTMLElement | null;
-    getElementsByClassName(classNames: string): HTMLCollectionOf<Element>;
-    /**
-     * Gets a collection of objects based on the value of the NAME or ID attribute.
-     * @param elementName Gets a collection of objects based on the value of the NAME or ID attribute.
-     */
-    getElementsByName(elementName: string): NodeListOf<HTMLElement>;
-    /**
-     * Retrieves a collection of objects based on the specified element name.
-     * @param name Specifies the name of an element.
-     */
-    getElementsByTagName<K extends keyof HTMLElementTagNameMap>(tagname: K): NodeListOf<HTMLElementTagNameMap[K]>;
-    getElementsByTagName<K extends keyof SVGElementTagNameMap>(tagname: K): NodeListOf<SVGElementTagNameMap[K]>;
-    getElementsByTagName(tagname: string): NodeListOf<Element>;
-    getElementsByTagNameNS(namespaceURI: "http://www.w3.org/1999/xhtml", localName: string): HTMLCollectionOf<HTMLElement>;
-    getElementsByTagNameNS(namespaceURI: "http://www.w3.org/2000/svg", localName: string): HTMLCollectionOf<SVGElement>;
-    getElementsByTagNameNS(namespaceURI: string, localName: string): HTMLCollectionOf<Element>;
-    /**
-     * Returns an object representing the current selection of the document that is loaded into the object displaying a webpage.
-     */
-    getSelection(): Selection;
-    /**
-     * Gets a value indicating whether the object currently has focus.
-     */
-    hasFocus(): boolean;
-    importNode<T extends Node>(importedNode: T, deep: boolean): T;
-    msElementsFromPoint(x: number, y: number): NodeListOf<Element>;
-    msElementsFromRect(left: number, top: number, width: number, height: number): NodeListOf<Element>;
-    /**
-     * Opens a new window and loads a document specified by a given URL. Also, opens a new window that uses the url parameter and the name parameter to collect the output of the write method and the writeln method.
-     * @param url Specifies a MIME type for the document.
-     * @param name Specifies the name of the window. This name is used as the value for the TARGET attribute on a form or an anchor element.
-     * @param features Contains a list of items separated by commas. Each item consists of an option and a value, separated by an equals sign (for example, "fullscreen=yes, toolbar=yes"). The following values are supported.
-     * @param replace Specifies whether the existing entry for the document is replaced in the history list.
-     */
-    open(url?: string, name?: string, features?: string, replace?: boolean): Document;
-    /**
-     * Returns a Boolean value that indicates whether a specified command can be successfully executed using execCommand, given the current state of the document.
-     * @param commandId Specifies a command identifier.
-     */
-    queryCommandEnabled(commandId: string): boolean;
-    /**
-     * Returns a Boolean value that indicates whether the specified command is in the indeterminate state.
-     * @param commandId String that specifies a command identifier.
-     */
-    queryCommandIndeterm(commandId: string): boolean;
-    /**
-     * Returns a Boolean value that indicates the current state of the command.
-     * @param commandId String that specifies a command identifier.
-     */
-    queryCommandState(commandId: string): boolean;
-    /**
-     * Returns a Boolean value that indicates whether the current command is supported on the current range.
-     * @param commandId Specifies a command identifier.
-     */
-    queryCommandSupported(commandId: string): boolean;
-    /**
-     * Retrieves the string associated with a command.
-     * @param commandId String that contains the identifier of a command. This can be any command identifier given in the list of Command Identifiers.
-     */
-    queryCommandText(commandId: string): string;
-    /**
-     * Returns the current value of the document, range, or current selection for the given command.
-     * @param commandId String that specifies a command identifier.
-     */
-    queryCommandValue(commandId: string): string;
-    releaseEvents(): void;
-    updateSettings(): void;
-    webkitCancelFullScreen(): void;
-    webkitExitFullscreen(): void;
-    /**
-     * Writes one or more HTML expressions to a document in the specified window.
-     * @param content Specifies the text and HTML tags to write.
-     */
-    write(...content: string[]): void;
-    /**
-     * Writes one or more HTML expressions, followed by a carriage return, to a document in the specified window.
-     * @param content The text and HTML tags to write.
-     */
-    writeln(...content: string[]): void;
-    addEventListener<K extends keyof DocumentEventMap>(type: K, listener: (this: Document, ev: DocumentEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof DocumentEventMap>(type: K, listener: (this: Document, ev: DocumentEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var Document: {
-    prototype: Document;
-    new(): Document;
-};
-
-interface DocumentEvent {
-    createEvent(eventInterface: "AnimationEvent"): AnimationEvent;
-    createEvent(eventInterface: "AnimationPlaybackEvent"): AnimationPlaybackEvent;
-    createEvent(eventInterface: "AudioProcessingEvent"): AudioProcessingEvent;
-    createEvent(eventInterface: "BeforeUnloadEvent"): BeforeUnloadEvent;
-    createEvent(eventInterface: "ClipboardEvent"): ClipboardEvent;
-    createEvent(eventInterface: "CloseEvent"): CloseEvent;
-    createEvent(eventInterface: "CompositionEvent"): CompositionEvent;
-    createEvent(eventInterface: "CustomEvent"): CustomEvent;
-    createEvent(eventInterface: "DeviceLightEvent"): DeviceLightEvent;
-    createEvent(eventInterface: "DeviceMotionEvent"): DeviceMotionEvent;
-    createEvent(eventInterface: "DeviceOrientationEvent"): DeviceOrientationEvent;
-    createEvent(eventInterface: "DragEvent"): DragEvent;
-    createEvent(eventInterface: "ErrorEvent"): ErrorEvent;
-    createEvent(eventInterface: "Event"): Event;
-    createEvent(eventInterface: "Events"): Event;
-    createEvent(eventInterface: "FocusEvent"): FocusEvent;
-    createEvent(eventInterface: "FocusNavigationEvent"): FocusNavigationEvent;
-    createEvent(eventInterface: "GamepadEvent"): GamepadEvent;
-    createEvent(eventInterface: "HashChangeEvent"): HashChangeEvent;
-    createEvent(eventInterface: "IDBVersionChangeEvent"): IDBVersionChangeEvent;
-    createEvent(eventInterface: "KeyboardEvent"): KeyboardEvent;
-    createEvent(eventInterface: "ListeningStateChangedEvent"): ListeningStateChangedEvent;
-    createEvent(eventInterface: "MSDCCEvent"): MSDCCEvent;
-    createEvent(eventInterface: "MSDSHEvent"): MSDSHEvent;
-    createEvent(eventInterface: "MSMediaKeyMessageEvent"): MSMediaKeyMessageEvent;
-    createEvent(eventInterface: "MSMediaKeyNeededEvent"): MSMediaKeyNeededEvent;
-    createEvent(eventInterface: "MediaEncryptedEvent"): MediaEncryptedEvent;
-    createEvent(eventInterface: "MediaKeyMessageEvent"): MediaKeyMessageEvent;
-    createEvent(eventInterface: "MediaStreamErrorEvent"): MediaStreamErrorEvent;
-    createEvent(eventInterface: "MediaStreamEvent"): MediaStreamEvent;
-    createEvent(eventInterface: "MediaStreamTrackEvent"): MediaStreamTrackEvent;
-    createEvent(eventInterface: "MessageEvent"): MessageEvent;
-    createEvent(eventInterface: "MouseEvent"): MouseEvent;
-    createEvent(eventInterface: "MouseEvents"): MouseEvent;
-    createEvent(eventInterface: "MutationEvent"): MutationEvent;
-    createEvent(eventInterface: "MutationEvents"): MutationEvent;
-    createEvent(eventInterface: "OfflineAudioCompletionEvent"): OfflineAudioCompletionEvent;
-    createEvent(eventInterface: "OverflowEvent"): OverflowEvent;
-    createEvent(eventInterface: "PageTransitionEvent"): PageTransitionEvent;
-    createEvent(eventInterface: "PaymentRequestUpdateEvent"): PaymentRequestUpdateEvent;
-    createEvent(eventInterface: "PermissionRequestedEvent"): PermissionRequestedEvent;
-    createEvent(eventInterface: "PointerEvent"): PointerEvent;
-    createEvent(eventInterface: "PopStateEvent"): PopStateEvent;
-    createEvent(eventInterface: "ProgressEvent"): ProgressEvent;
-    createEvent(eventInterface: "PromiseRejectionEvent"): PromiseRejectionEvent;
-    createEvent(eventInterface: "RTCDTMFToneChangeEvent"): RTCDTMFToneChangeEvent;
-    createEvent(eventInterface: "RTCDtlsTransportStateChangedEvent"): RTCDtlsTransportStateChangedEvent;
-    createEvent(eventInterface: "RTCIceCandidatePairChangedEvent"): RTCIceCandidatePairChangedEvent;
-    createEvent(eventInterface: "RTCIceGathererEvent"): RTCIceGathererEvent;
-    createEvent(eventInterface: "RTCIceTransportStateChangedEvent"): RTCIceTransportStateChangedEvent;
-    createEvent(eventInterface: "RTCPeerConnectionIceEvent"): RTCPeerConnectionIceEvent;
-    createEvent(eventInterface: "RTCSsrcConflictEvent"): RTCSsrcConflictEvent;
-    createEvent(eventInterface: "SVGZoomEvent"): SVGZoomEvent;
-    createEvent(eventInterface: "SVGZoomEvents"): SVGZoomEvent;
-    createEvent(eventInterface: "SecurityPolicyViolationEvent"): SecurityPolicyViolationEvent;
-    createEvent(eventInterface: "ServiceWorkerMessageEvent"): ServiceWorkerMessageEvent;
-    createEvent(eventInterface: "SpeechSynthesisEvent"): SpeechSynthesisEvent;
-    createEvent(eventInterface: "StorageEvent"): StorageEvent;
-    createEvent(eventInterface: "TextEvent"): TextEvent;
-    createEvent(eventInterface: "TouchEvent"): TouchEvent;
-    createEvent(eventInterface: "TrackEvent"): TrackEvent;
-    createEvent(eventInterface: "TransitionEvent"): TransitionEvent;
-    createEvent(eventInterface: "UIEvent"): UIEvent;
-    createEvent(eventInterface: "UIEvents"): UIEvent;
-    createEvent(eventInterface: "VRDisplayEvent"): VRDisplayEvent;
-    createEvent(eventInterface: "VRDisplayEvent "): VRDisplayEvent ;
-    createEvent(eventInterface: "WebGLContextEvent"): WebGLContextEvent;
-    createEvent(eventInterface: "WheelEvent"): WheelEvent;
-    createEvent(eventInterface: string): Event;
-}
-
-interface DocumentFragment extends Node, ParentNode {
-    getElementById(elementId: string): HTMLElement | null;
-}
-
-declare var DocumentFragment: {
-    prototype: DocumentFragment;
-    new(): DocumentFragment;
-};
-
-interface DocumentOrShadowRoot {
-    readonly activeElement: Element | null;
-    readonly styleSheets: StyleSheetList;
-    elementFromPoint(x: number, y: number): Element | null;
-    elementsFromPoint(x: number, y: number): Element[];
-    getSelection(): Selection | null;
-}
-
-interface DocumentType extends Node, ChildNode {
-    readonly entities: NamedNodeMap;
-    readonly internalSubset: string | null;
-    readonly name: string;
-    readonly notations: NamedNodeMap;
-    readonly publicId: string;
-    readonly systemId: string;
-}
-
-declare var DocumentType: {
-    prototype: DocumentType;
-    new(): DocumentType;
-};
-
-interface DragEvent extends MouseEvent {
-    readonly dataTransfer: DataTransfer;
-    initDragEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number, screenXArg: number, screenYArg: number, clientXArg: number, clientYArg: number, ctrlKeyArg: boolean, altKeyArg: boolean, shiftKeyArg: boolean, metaKeyArg: boolean, buttonArg: number, relatedTargetArg: EventTarget, dataTransferArg: DataTransfer): void;
-    msConvertURL(file: File, targetType: string, targetURL?: string): void;
-}
-
-declare var DragEvent: {
-    prototype: DragEvent;
-    new(type: "drag" | "dragend" | "dragenter" | "dragexit" | "dragleave" | "dragover" | "dragstart" | "drop", dragEventInit?: { dataTransfer?: DataTransfer }): DragEvent;
-};
-
-interface DynamicsCompressorNode extends AudioNode {
-    readonly attack: AudioParam;
-    readonly knee: AudioParam;
-    readonly ratio: AudioParam;
-    readonly reduction: number;
-    readonly release: AudioParam;
-    readonly threshold: AudioParam;
-}
-
-declare var DynamicsCompressorNode: {
-    prototype: DynamicsCompressorNode;
-    new(): DynamicsCompressorNode;
-};
-
-interface EXT_blend_minmax {
-    readonly MAX_EXT: number;
-    readonly MIN_EXT: number;
-}
-
-interface EXT_frag_depth {
-}
-
-interface EXT_sRGB {
-    readonly FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING_EXT: number;
-    readonly SRGB8_ALPHA8_EXT: number;
-    readonly SRGB_ALPHA_EXT: number;
-    readonly SRGB_EXT: number;
-}
-
-interface EXT_shader_texture_lod {
-}
-
-interface EXT_texture_filter_anisotropic {
-    readonly MAX_TEXTURE_MAX_ANISOTROPY_EXT: number;
-    readonly TEXTURE_MAX_ANISOTROPY_EXT: number;
-}
-
-declare var EXT_texture_filter_anisotropic: {
-    prototype: EXT_texture_filter_anisotropic;
-    new(): EXT_texture_filter_anisotropic;
-    readonly MAX_TEXTURE_MAX_ANISOTROPY_EXT: number;
-    readonly TEXTURE_MAX_ANISOTROPY_EXT: number;
-};
-
-interface ElementEventMap extends GlobalEventHandlersEventMap {
-    "ariarequest": Event;
-    "command": Event;
-    "gotpointercapture": PointerEvent;
-    "lostpointercapture": PointerEvent;
-    "MSGestureChange": Event;
-    "MSGestureDoubleTap": Event;
-    "MSGestureEnd": Event;
-    "MSGestureHold": Event;
-    "MSGestureStart": Event;
-    "MSGestureTap": Event;
-    "MSGotPointerCapture": Event;
-    "MSInertiaStart": Event;
-    "MSLostPointerCapture": Event;
-    "MSPointerCancel": Event;
-    "MSPointerDown": Event;
-    "MSPointerEnter": Event;
-    "MSPointerLeave": Event;
-    "MSPointerMove": Event;
-    "MSPointerOut": Event;
-    "MSPointerOver": Event;
-    "MSPointerUp": Event;
-    "touchcancel": TouchEvent;
-    "touchend": TouchEvent;
-    "touchmove": TouchEvent;
-    "touchstart": TouchEvent;
-    "webkitfullscreenchange": Event;
-    "webkitfullscreenerror": Event;
-}
-
-interface Element extends Node, GlobalEventHandlers, ElementTraversal, ParentNode, ChildNode {
-    readonly assignedSlot: HTMLSlotElement | null;
-    readonly attributes: NamedNodeMap;
-    readonly classList: DOMTokenList;
-    className: string;
-    readonly clientHeight: number;
-    readonly clientLeft: number;
-    readonly clientTop: number;
-    readonly clientWidth: number;
-    id: string;
-    innerHTML: string;
-    msContentZoomFactor: number;
-    readonly msRegionOverflow: string;
-    onariarequest: ((this: Element, ev: Event) => any) | null;
-    oncommand: ((this: Element, ev: Event) => any) | null;
-    ongotpointercapture: ((this: Element, ev: PointerEvent) => any) | null;
-    onlostpointercapture: ((this: Element, ev: PointerEvent) => any) | null;
-    onmsgesturechange: ((this: Element, ev: Event) => any) | null;
-    onmsgesturedoubletap: ((this: Element, ev: Event) => any) | null;
-    onmsgestureend: ((this: Element, ev: Event) => any) | null;
-    onmsgesturehold: ((this: Element, ev: Event) => any) | null;
-    onmsgesturestart: ((this: Element, ev: Event) => any) | null;
-    onmsgesturetap: ((this: Element, ev: Event) => any) | null;
-    onmsgotpointercapture: ((this: Element, ev: Event) => any) | null;
-    onmsinertiastart: ((this: Element, ev: Event) => any) | null;
-    onmslostpointercapture: ((this: Element, ev: Event) => any) | null;
-    onmspointercancel: ((this: Element, ev: Event) => any) | null;
-    onmspointerdown: ((this: Element, ev: Event) => any) | null;
-    onmspointerenter: ((this: Element, ev: Event) => any) | null;
-    onmspointerleave: ((this: Element, ev: Event) => any) | null;
-    onmspointermove: ((this: Element, ev: Event) => any) | null;
-    onmspointerout: ((this: Element, ev: Event) => any) | null;
-    onmspointerover: ((this: Element, ev: Event) => any) | null;
-    onmspointerup: ((this: Element, ev: Event) => any) | null;
-    ontouchcancel: ((this: Element, ev: TouchEvent) => any) | null;
-    ontouchend: ((this: Element, ev: TouchEvent) => any) | null;
-    ontouchmove: ((this: Element, ev: TouchEvent) => any) | null;
-    ontouchstart: ((this: Element, ev: TouchEvent) => any) | null;
-    onwebkitfullscreenchange: ((this: Element, ev: Event) => any) | null;
-    onwebkitfullscreenerror: ((this: Element, ev: Event) => any) | null;
-    outerHTML: string;
-    readonly prefix: string | null;
-    readonly scrollHeight: number;
-    scrollLeft: number;
-    scrollTop: number;
-    readonly scrollWidth: number;
-    readonly shadowRoot: ShadowRoot | null;
-    slot: string;
-    readonly tagName: string;
-    attachShadow(shadowRootInitDict: ShadowRootInit): ShadowRoot;
-    closest<K extends keyof HTMLElementTagNameMap>(selector: K): HTMLElementTagNameMap[K] | null;
-    closest<K extends keyof SVGElementTagNameMap>(selector: K): SVGElementTagNameMap[K] | null;
-    closest(selector: string): Element | null;
-    getAttribute(qualifiedName: string): string | null;
-    getAttributeNS(namespaceURI: string, localName: string): string;
-    getAttributeNode(name: string): Attr | null;
-    getAttributeNodeNS(namespaceURI: string, localName: string): Attr | null;
-    getBoundingClientRect(): ClientRect | DOMRect;
-    getClientRects(): ClientRectList | DOMRectList;
-    getElementsByClassName(classNames: string): NodeListOf<Element>;
-    getElementsByTagName<K extends keyof HTMLElementTagNameMap>(name: K): NodeListOf<HTMLElementTagNameMap[K]>;
-    getElementsByTagName<K extends keyof SVGElementTagNameMap>(name: K): NodeListOf<SVGElementTagNameMap[K]>;
-    getElementsByTagName(name: string): NodeListOf<Element>;
-    getElementsByTagNameNS(namespaceURI: "http://www.w3.org/1999/xhtml", localName: string): HTMLCollectionOf<HTMLElement>;
-    getElementsByTagNameNS(namespaceURI: "http://www.w3.org/2000/svg", localName: string): HTMLCollectionOf<SVGElement>;
-    getElementsByTagNameNS(namespaceURI: string, localName: string): HTMLCollectionOf<Element>;
-    hasAttribute(name: string): boolean;
-    hasAttributeNS(namespaceURI: string, localName: string): boolean;
-    hasAttributes(): boolean;
-    insertAdjacentElement(position: InsertPosition, insertedElement: Element): Element | null;
-    insertAdjacentHTML(where: InsertPosition, html: string): void;
-    insertAdjacentText(where: InsertPosition, text: string): void;
-    matches(selectors: string): boolean;
-    msGetRegionContent(): any;
-    msGetUntransformedBounds(): ClientRect;
-    msMatchesSelector(selectors: string): boolean;
-    msReleasePointerCapture(pointerId: number): void;
-    msSetPointerCapture(pointerId: number): void;
-    msZoomTo(args: MsZoomToOptions): void;
-    releasePointerCapture(pointerId: number): void;
-    removeAttribute(qualifiedName: string): void;
-    removeAttributeNS(namespaceURI: string, localName: string): void;
-    removeAttributeNode(oldAttr: Attr): Attr;
-    requestFullscreen(): void;
-    requestPointerLock(): void;
-    scroll(options?: ScrollToOptions): void;
-    scroll(x: number, y: number): void;
-    scrollBy(options?: ScrollToOptions): void;
-    scrollBy(x: number, y: number): void;
-    scrollIntoView(arg?: boolean | ScrollIntoViewOptions): void;
-    scrollTo(options?: ScrollToOptions): void;
-    scrollTo(x: number, y: number): void;
-    setAttribute(qualifiedName: string, value: string): void;
-    setAttributeNS(namespaceURI: string, qualifiedName: string, value: string): void;
-    setAttributeNode(newAttr: Attr): Attr;
-    setAttributeNodeNS(newAttr: Attr): Attr;
-    setPointerCapture(pointerId: number): void;
-    webkitMatchesSelector(selectors: string): boolean;
-    webkitRequestFullScreen(): void;
-    webkitRequestFullscreen(): void;
-    addEventListener<K extends keyof ElementEventMap>(type: K, listener: (this: Element, ev: ElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof ElementEventMap>(type: K, listener: (this: Element, ev: ElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var Element: {
-    prototype: Element;
-    new(): Element;
-};
-
-interface ElementCSSInlineStyle {
-    readonly style: CSSStyleDeclaration;
-}
-
-interface ElementCreationOptions {
-    is?: string;
-}
-
-interface ElementDefinitionOptions {
-    extends: string;
-}
-
-interface ElementTraversal {
-    readonly childElementCount: number;
-    readonly firstElementChild: Element | null;
-    readonly lastElementChild: Element | null;
-    readonly nextElementSibling: Element | null;
-    readonly previousElementSibling: Element | null;
-}
-
-interface ErrorEvent extends Event {
-    readonly colno: number;
-    readonly error: any;
-    readonly filename: string;
-    readonly lineno: number;
-    readonly message: string;
-    initErrorEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, messageArg: string, filenameArg: string, linenoArg: number): void;
-}
-
-declare var ErrorEvent: {
-    prototype: ErrorEvent;
-    new(typeArg: string, eventInitDict?: ErrorEventInit): ErrorEvent;
-};
-
-interface Event {
-    readonly bubbles: boolean;
-    cancelBubble: boolean;
-    readonly cancelable: boolean;
-    readonly currentTarget: EventTarget | null;
-    readonly defaultPrevented: boolean;
-    readonly eventPhase: number;
-    readonly isTrusted: boolean;
-    returnValue: boolean;
-    readonly scoped: boolean;
-    readonly srcElement: Element | null;
-    readonly target: EventTarget | null;
-    readonly timeStamp: number;
-    readonly type: string;
-    deepPath(): EventTarget[];
-    initEvent(type: string, bubbles?: boolean, cancelable?: boolean): void;
-    preventDefault(): void;
-    stopImmediatePropagation(): void;
-    stopPropagation(): void;
-    readonly AT_TARGET: number;
-    readonly BUBBLING_PHASE: number;
-    readonly CAPTURING_PHASE: number;
-    readonly NONE: number;
-}
-
-declare var Event: {
-    prototype: Event;
-    new(typeArg: string, eventInitDict?: EventInit): Event;
-    readonly AT_TARGET: number;
-    readonly BUBBLING_PHASE: number;
-    readonly CAPTURING_PHASE: number;
-    readonly NONE: number;
-};
-
-interface EventListenerObject {
-    handleEvent(evt: Event): void;
-}
-
-interface EventSource extends EventTarget {
-    readonly CLOSED: number;
-    readonly CONNECTING: number;
-    readonly OPEN: number;
-    onerror: (evt: MessageEvent) => any;
-    onmessage: (evt: MessageEvent) => any;
-    onopen: (evt: MessageEvent) => any;
-    readonly readyState: number;
-    readonly url: string;
-    readonly withCredentials: boolean;
-    close(): void;
-}
-
-declare var EventSource: {
-    prototype: EventSource;
-    new(url: string, eventSourceInitDict?: EventSourceInit): EventSource;
-};
-
-interface EventSourceInit {
-    readonly withCredentials: boolean;
-}
-
-interface EventTarget {
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject | null, options?: boolean | AddEventListenerOptions): void;
-    dispatchEvent(evt: Event): boolean;
-    removeEventListener(type: string, listener?: EventListenerOrEventListenerObject | null, options?: EventListenerOptions | boolean): void;
-}
-
-declare var EventTarget: {
-    prototype: EventTarget;
-    new(): EventTarget;
-};
-
-interface ExtensionScriptApis {
-    extensionIdToShortId(extensionId: string): number;
-    fireExtensionApiTelemetry(functionName: string, isSucceeded: boolean, isSupported: boolean, errorString: string): void;
-    genericFunction(routerAddress: any, parameters?: string, callbackId?: number): void;
-    genericSynchronousFunction(functionId: number, parameters?: string): string;
-    genericWebRuntimeCallout(to: any, from: any, payload: string): void;
-    getExtensionId(): string;
-    registerGenericFunctionCallbackHandler(callbackHandler: Function): void;
-    registerGenericPersistentCallbackHandler(callbackHandler: Function): void;
-    registerWebRuntimeCallbackHandler(handler: Function): any;
-}
-
-declare var ExtensionScriptApis: {
-    prototype: ExtensionScriptApis;
-    new(): ExtensionScriptApis;
-};
-
-interface External {
-}
-
-declare var External: {
-    prototype: External;
-    new(): External;
-};
-
-interface File extends Blob {
-    readonly lastModified: number;
-    /** @deprecated */
-    readonly lastModifiedDate: Date;
-    readonly name: string;
-    readonly webkitRelativePath: string;
-}
-
-declare var File: {
-    prototype: File;
-    new (parts: (ArrayBuffer | ArrayBufferView | Blob | string)[], filename: string, properties?: FilePropertyBag): File;
-};
-
-interface FileList {
-    readonly length: number;
-    item(index: number): File | null;
-    [index: number]: File;
-}
-
-declare var FileList: {
-    prototype: FileList;
-    new(): FileList;
-};
-
-interface FilePropertyBag extends BlobPropertyBag {
-    lastModified?: number;
-}
-
-interface FileReaderEventMap {
-    "abort": ProgressEvent;
-    "error": ProgressEvent;
-    "load": ProgressEvent;
-    "loadend": ProgressEvent;
-    "loadstart": ProgressEvent;
-    "progress": ProgressEvent;
-}
-
-interface FileReader extends EventTarget {
-    readonly error: DOMException | null;
-    onabort: ((this: FileReader, ev: FileReaderProgressEvent) => any) | null;
-    onerror: ((this: FileReader, ev: FileReaderProgressEvent) => any) | null;
-    onload: ((this: FileReader, ev: FileReaderProgressEvent) => any) | null;
-    onloadend: ((this: FileReader, ev: FileReaderProgressEvent) => any) | null;
-    onloadstart: ((this: FileReader, ev: FileReaderProgressEvent) => any) | null;
-    onprogress: ((this: FileReader, ev: FileReaderProgressEvent) => any) | null;
-    readonly readyState: number;
-    readonly result: any;
-    abort(): void;
-    readAsArrayBuffer(blob: Blob): void;
-    readAsBinaryString(blob: Blob): void;
-    readAsDataURL(blob: Blob): void;
-    readAsText(blob: Blob, label?: string): void;
-    readonly DONE: number;
-    readonly EMPTY: number;
-    readonly LOADING: number;
-    addEventListener<K extends keyof FileReaderEventMap>(type: K, listener: (this: FileReader, ev: FileReaderEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof FileReaderEventMap>(type: K, listener: (this: FileReader, ev: FileReaderEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var FileReader: {
-    prototype: FileReader;
-    new(): FileReader;
-    readonly DONE: number;
-    readonly EMPTY: number;
-    readonly LOADING: number;
-};
-
-interface FileReaderProgressEvent extends ProgressEvent {
-    readonly target: FileReader | null;
-}
-
-interface FocusEvent extends UIEvent {
-    readonly relatedTarget: EventTarget;
-    initFocusEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number, relatedTargetArg: EventTarget): void;
-}
-
-declare var FocusEvent: {
-    prototype: FocusEvent;
-    new(typeArg: string, eventInitDict?: FocusEventInit): FocusEvent;
-};
-
-interface FocusNavigationEvent extends Event {
-    readonly navigationReason: NavigationReason;
-    readonly originHeight: number;
-    readonly originLeft: number;
-    readonly originTop: number;
-    readonly originWidth: number;
-    requestFocus(): void;
-}
-
-declare var FocusNavigationEvent: {
-    prototype: FocusNavigationEvent;
-    new(type: string, eventInitDict?: FocusNavigationEventInit): FocusNavigationEvent;
-};
-
-interface FormData {
-    append(name: string, value: string | Blob, fileName?: string): void;
-    delete(name: string): void;
-    get(name: string): FormDataEntryValue | null;
-    getAll(name: string): FormDataEntryValue[];
-    has(name: string): boolean;
-    set(name: string, value: string | Blob, fileName?: string): void;
-}
-
-declare var FormData: {
-    prototype: FormData;
-    new(): FormData;
-    new(form: HTMLFormElement): FormData;
-};
-
-interface GainNode extends AudioNode {
-    readonly gain: AudioParam;
-}
-
-declare var GainNode: {
-    prototype: GainNode;
-    new(): GainNode;
-};
-
-interface Gamepad {
-    readonly axes: number[];
-    readonly buttons: GamepadButton[];
-    readonly connected: boolean;
-    readonly displayId: number;
-    readonly hand: GamepadHand;
-    readonly hapticActuators: GamepadHapticActuator[];
-    readonly id: string;
-    readonly index: number;
-    readonly mapping: GamepadMappingType;
-    readonly pose: GamepadPose | null;
-    readonly timestamp: number;
-}
-
-declare var Gamepad: {
-    prototype: Gamepad;
-    new(): Gamepad;
-};
-
-interface GamepadButton {
-    readonly pressed: boolean;
-    readonly touched: boolean;
-    readonly value: number;
-}
-
-declare var GamepadButton: {
-    prototype: GamepadButton;
-    new(): GamepadButton;
-};
-
-interface GamepadEvent extends Event {
-    readonly gamepad: Gamepad;
-}
-
-declare var GamepadEvent: {
-    prototype: GamepadEvent;
-    new(typeArg: string, eventInitDict?: GamepadEventInit): GamepadEvent;
-};
-
-interface GamepadHapticActuator {
-    readonly type: GamepadHapticActuatorType;
-    pulse(value: number, duration: number): Promise<boolean>;
-}
-
-declare var GamepadHapticActuator: {
-    prototype: GamepadHapticActuator;
-    new(): GamepadHapticActuator;
-};
-
-interface GamepadPose {
-    readonly angularAcceleration: Float32Array | null;
-    readonly angularVelocity: Float32Array | null;
-    readonly hasOrientation: boolean;
-    readonly hasPosition: boolean;
-    readonly linearAcceleration: Float32Array | null;
-    readonly linearVelocity: Float32Array | null;
-    readonly orientation: Float32Array | null;
-    readonly position: Float32Array | null;
-}
-
-declare var GamepadPose: {
-    prototype: GamepadPose;
-    new(): GamepadPose;
-};
-
-interface Geolocation {
-    clearWatch(watchId: number): void;
-    getCurrentPosition(successCallback: PositionCallback, errorCallback?: PositionErrorCallback, options?: PositionOptions): void;
-    watchPosition(successCallback: PositionCallback, errorCallback?: PositionErrorCallback, options?: PositionOptions): number;
-}
-
-declare var Geolocation: {
-    prototype: Geolocation;
-    new(): Geolocation;
-};
-
-interface GetSVGDocument {
-    getSVGDocument(): Document;
-}
-
-interface GlobalEventHandlersEventMap {
-    "pointercancel": PointerEvent;
-    "pointerdown": PointerEvent;
-    "pointerenter": PointerEvent;
-    "pointerleave": PointerEvent;
-    "pointermove": PointerEvent;
-    "pointerout": PointerEvent;
-    "pointerover": PointerEvent;
-    "pointerup": PointerEvent;
-    "wheel": WheelEvent;
-}
-
-interface GlobalEventHandlers {
-    onpointercancel: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
-    onpointerdown: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
-    onpointerenter: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
-    onpointerleave: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
-    onpointermove: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
-    onpointerout: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
-    onpointerover: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
-    onpointerup: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
-    onwheel: ((this: GlobalEventHandlers, ev: WheelEvent) => any) | null;
-    addEventListener<K extends keyof GlobalEventHandlersEventMap>(type: K, listener: (this: GlobalEventHandlers, ev: GlobalEventHandlersEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof GlobalEventHandlersEventMap>(type: K, listener: (this: GlobalEventHandlers, ev: GlobalEventHandlersEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-interface GlobalFetch {
-    fetch(input?: Request | string, init?: RequestInit): Promise<Response>;
-}
-
-interface HTMLAllCollection {
-    readonly length: number;
-    item(nameOrIndex?: string): HTMLCollection | Element | null;
-    namedItem(name: string): HTMLCollection | Element | null;
-    [index: number]: Element;
-}
-
-declare var HTMLAllCollection: {
-    prototype: HTMLAllCollection;
-    new(): HTMLAllCollection;
-};
-
-interface HTMLAnchorElement extends HTMLElement, HTMLHyperlinkElementUtils {
-    Methods: string;
-    /**
-     * Sets or retrieves the character set used to encode the object.
-     */
-    /** @deprecated */
-    charset: string;
-    /**
-     * Sets or retrieves the coordinates of the object.
-     */
-    /** @deprecated */
-    coords: string;
-    download: string;
-    /**
-     * Sets or retrieves the language code of the object.
-     */
-    hreflang: string;
-    readonly mimeType: string;
-    /**
-     * Sets or retrieves the shape of the object.
-     */
-    /** @deprecated */
-    name: string;
-    readonly nameProp: string;
-    readonly protocolLong: string;
-    /**
-     * Sets or retrieves the relationship between the object and the destination of the link.
-     */
-    rel: string;
-    /**
-     * Sets or retrieves the relationship between the object and the destination of the link.
-     */
-    /** @deprecated */
-    rev: string;
-    /**
-     * Sets or retrieves the shape of the object.
-     */
-    /** @deprecated */
-    shape: string;
-    /**
-     * Sets or retrieves the window or frame at which to target content.
-     */
-    target: string;
-    /**
-     * Retrieves or sets the text of the object as a string.
-     */
-    text: string;
-    type: string;
-    urn: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLAnchorElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLAnchorElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLAnchorElement: {
-    prototype: HTMLAnchorElement;
-    new(): HTMLAnchorElement;
-};
-
-interface HTMLAppletElement extends HTMLElement {
-    /** @deprecated */
-    align: string;
-    /**
-     * Sets or retrieves a text alternative to the graphic.
-     */
-    /** @deprecated */
-    alt: string;
-    /**
-     * Sets or retrieves a character string that can be used to implement your own archive functionality for the object.
-     */
-    /** @deprecated */
-    archive: string;
-    /** @deprecated */
-    code: string;
-    /**
-     * Sets or retrieves the URL of the component.
-     */
-    /** @deprecated */
-    codeBase: string;
-    readonly form: HTMLFormElement | null;
-    /**
-     * Sets or retrieves the height of the object.
-     */
-    /** @deprecated */
-    height: string;
-    /** @deprecated */
-    hspace: number;
-    /**
-     * Sets or retrieves the shape of the object.
-     */
-    /** @deprecated */
-    name: string;
-    /** @deprecated */
-    object: string;
-    /** @deprecated */
-    vspace: number;
-    /** @deprecated */
-    width: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLAppletElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLAppletElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLAppletElement: {
-    prototype: HTMLAppletElement;
-    new(): HTMLAppletElement;
-};
-
-interface HTMLAreaElement extends HTMLElement, HTMLHyperlinkElementUtils {
-    /**
-     * Sets or retrieves a text alternative to the graphic.
-     */
-    alt: string;
-    /**
-     * Sets or retrieves the coordinates of the object.
-     */
-    coords: string;
-    download: string;
-    /**
-     * Sets or gets whether clicks in this region cause action.
-     */
-    /** @deprecated */
-    noHref: boolean;
-    rel: string;
-    /**
-     * Sets or retrieves the shape of the object.
-     */
-    shape: string;
-    /**
-     * Sets or retrieves the window or frame at which to target content.
-     */
-    target: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLAreaElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLAreaElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLAreaElement: {
-    prototype: HTMLAreaElement;
-    new(): HTMLAreaElement;
-};
-
-interface HTMLAreasCollection extends HTMLCollectionBase {
-}
-
-declare var HTMLAreasCollection: {
-    prototype: HTMLAreasCollection;
-    new(): HTMLAreasCollection;
-};
-
-interface HTMLAudioElement extends HTMLMediaElement {
-    addEventListener<K extends keyof HTMLMediaElementEventMap>(type: K, listener: (this: HTMLAudioElement, ev: HTMLMediaElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLMediaElementEventMap>(type: K, listener: (this: HTMLAudioElement, ev: HTMLMediaElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLAudioElement: {
-    prototype: HTMLAudioElement;
-    new(): HTMLAudioElement;
-};
-
-interface HTMLBRElement extends HTMLElement {
-    /**
-     * Sets or retrieves the side on which floating objects are not to be positioned when any IHTMLBlockElement is inserted into the document.
-     */
-    /** @deprecated */
-    clear: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLBRElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLBRElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLBRElement: {
-    prototype: HTMLBRElement;
-    new(): HTMLBRElement;
-};
-
-interface HTMLBaseElement extends HTMLElement {
-    /**
-     * Gets or sets the baseline URL on which relative links are based.
-     */
-    href: string;
-    /**
-     * Sets or retrieves the window or frame at which to target content.
-     */
-    target: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLBaseElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLBaseElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLBaseElement: {
-    prototype: HTMLBaseElement;
-    new(): HTMLBaseElement;
-};
-
-interface HTMLBaseFontElement extends HTMLElement, DOML2DeprecatedColorProperty {
-    /**
-     * Sets or retrieves the current typeface family.
-     */
-    /** @deprecated */
-    face: string;
-    /**
-     * Sets or retrieves the font size of the object.
-     */
-    /** @deprecated */
-    size: number;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLBaseFontElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLBaseFontElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLBaseFontElement: {
-    prototype: HTMLBaseFontElement;
-    new(): HTMLBaseFontElement;
-};
-
-interface HTMLBodyElementEventMap extends HTMLElementEventMap, WindowEventHandlersEventMap {
-    "blur": FocusEvent;
-    "error": ErrorEvent;
-    "focus": FocusEvent;
-    "load": Event;
-    "orientationchange": Event;
-    "resize": UIEvent;
-    "scroll": UIEvent;
-}
-
-interface HTMLBodyElement extends HTMLElement, WindowEventHandlers {
-    /** @deprecated */
-    aLink: string;
-    /** @deprecated */
-    background: string;
-    /** @deprecated */
-    bgColor: string;
-    bgProperties: string;
-    /** @deprecated */
-    link: string;
-    /** @deprecated */
-    noWrap: boolean;
-    onorientationchange: ((this: HTMLBodyElement, ev: Event) => any) | null;
-    onresize: ((this: HTMLBodyElement, ev: UIEvent) => any) | null;
-    /** @deprecated */
-    text: string;
-    /** @deprecated */
-    vLink: string;
-    addEventListener<K extends keyof HTMLBodyElementEventMap>(type: K, listener: (this: HTMLBodyElement, ev: HTMLBodyElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLBodyElementEventMap>(type: K, listener: (this: HTMLBodyElement, ev: HTMLBodyElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLBodyElement: {
-    prototype: HTMLBodyElement;
-    new(): HTMLBodyElement;
-};
-
-interface HTMLButtonElement extends HTMLElement {
-    /**
-     * Provides a way to direct a user to a specific field when a document loads. This can provide both direction and convenience for a user, reducing the need to click or tab to a field when a page opens. This attribute is true when present on an element, and false when missing.
-     */
-    autofocus: boolean;
-    disabled: boolean;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Overrides the action attribute (where the data on a form is sent) on the parent form element.
-     */
-    formAction: string;
-    /**
-     * Used to override the encoding (formEnctype attribute) specified on the form element.
-     */
-    formEnctype: string;
-    /**
-     * Overrides the submit method attribute previously specified on a form element.
-     */
-    formMethod: string;
-    /**
-     * Overrides any validation or required attributes on a form or form elements to allow it to be submitted without validation. This can be used to create a "save draft"-type submit option.
-     */
-    formNoValidate: boolean;
-    /**
-     * Overrides the target attribute on a form element.
-     */
-    formTarget: string;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    name: string;
-    status: any;
-    /**
-     * Gets the classification and default behavior of the button.
-     */
-    type: string;
-    /**
-     * Returns the error message that would be displayed if the user submits the form, or an empty string if no error message. It also triggers the standard error message, such as "this is a required field". The result is that the user sees validation messages without actually submitting.
-     */
-    readonly validationMessage: string;
-    /**
-     * Returns a  ValidityState object that represents the validity states of an element.
-     */
-    readonly validity: ValidityState;
-    /**
-     * Sets or retrieves the default or selected value of the control.
-     */
-    value: string;
-    /**
-     * Returns whether an element will successfully validate based on forms validation rules and constraints.
-     */
-    readonly willValidate: boolean;
-    /**
-     * Returns whether a form will validate when it is submitted, without having to submit it.
-     */
-    checkValidity(): boolean;
-    /**
-     * Sets a custom error message that is displayed when a form is submitted.
-     * @param error Sets a custom error message that is displayed when a form is submitted.
-     */
-    setCustomValidity(error: string): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLButtonElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLButtonElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLButtonElement: {
-    prototype: HTMLButtonElement;
-    new(): HTMLButtonElement;
-};
-
-interface HTMLCanvasElement extends HTMLElement {
-    /**
-     * Gets or sets the height of a canvas element on a document.
-     */
-    height: number;
-    /**
-     * Gets or sets the width of a canvas element on a document.
-     */
-    width: number;
-    /**
-     * Returns an object that provides methods and properties for drawing and manipulating images and graphics on a canvas element in a document. A context object includes information about colors, line widths, fonts, and other graphic parameters that can be drawn on a canvas.
-     * @param contextId The identifier (ID) of the type of canvas to create. Internet Explorer 9 and Internet Explorer 10 support only a 2-D context using canvas.getContext("2d"); IE11 Preview also supports 3-D or WebGL context using canvas.getContext("experimental-webgl");
-     */
-    getContext(contextId: "2d", contextAttributes?: Canvas2DContextAttributes): CanvasRenderingContext2D | null;
-    getContext(contextId: "webgl" | "experimental-webgl", contextAttributes?: WebGLContextAttributes): WebGLRenderingContext | null;
-    getContext(contextId: string, contextAttributes?: {}): CanvasRenderingContext2D | WebGLRenderingContext | null;
-    /**
-     * Returns a blob object encoded as a Portable Network Graphics (PNG) format from a canvas image or drawing.
-     */
-    msToBlob(): Blob;
-    toBlob(callback: (result: Blob | null) => void, type?: string, ...arguments: any[]): void;
-    /**
-     * Returns the content of the current canvas as an image that you can use as a source for another canvas or an HTML element.
-     * @param type The standard MIME type for the image format to return. If you do not specify this parameter, the default value is a PNG format image.
-     */
-    toDataURL(type?: string, ...args: any[]): string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLCanvasElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLCanvasElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLCanvasElement: {
-    prototype: HTMLCanvasElement;
-    new(): HTMLCanvasElement;
-};
-
-interface HTMLCollectionBase {
-    /**
-     * Sets or retrieves the number of objects in a collection.
-     */
-    readonly length: number;
-    /**
-     * Retrieves an object from various collections.
-     */
-    item(index: number): Element;
-    [index: number]: Element;
-}
-
-interface HTMLCollection extends HTMLCollectionBase {
-    /**
-     * Retrieves a select object or an object from an options collection.
-     */
-    namedItem(name: string): Element | null;
-}
-
-declare var HTMLCollection: {
-    prototype: HTMLCollection;
-    new(): HTMLCollection;
-};
-
-interface HTMLCollectionOf<T extends Element> extends HTMLCollectionBase {
-    item(index: number): T;
-    namedItem(name: string): T;
-    [index: number]: T;
-}
-
-interface HTMLDListElement extends HTMLElement {
-    /** @deprecated */
-    compact: boolean;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDListElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDListElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLDListElement: {
-    prototype: HTMLDListElement;
-    new(): HTMLDListElement;
-};
-
-interface HTMLDataElement extends HTMLElement {
-    value: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDataElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDataElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLDataElement: {
-    prototype: HTMLDataElement;
-    new(): HTMLDataElement;
-};
-
-interface HTMLDataListElement extends HTMLElement {
-    readonly options: HTMLCollectionOf<HTMLOptionElement>;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDataListElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDataListElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLDataListElement: {
-    prototype: HTMLDataListElement;
-    new(): HTMLDataListElement;
-};
-
-interface HTMLDetailsElement extends HTMLElement {
-    open: boolean;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDetailsElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDetailsElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLDetailsElement: {
-    prototype: HTMLDetailsElement;
-    new(): HTMLDetailsElement;
-};
-
-interface HTMLDialogElement extends HTMLElement {
-    open: boolean;
-    returnValue: string;
-    close(returnValue?: string): void;
-    show(): void;
-    showModal(): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDialogElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDialogElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLDialogElement: {
-    prototype: HTMLDialogElement;
-    new(): HTMLDialogElement;
-};
-
-interface HTMLDirectoryElement extends HTMLElement {
-    compact: boolean;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDirectoryElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDirectoryElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLDirectoryElement: {
-    prototype: HTMLDirectoryElement;
-    new(): HTMLDirectoryElement;
-};
-
-interface HTMLDivElement extends HTMLElement {
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    /** @deprecated */
-    align: string;
-    /**
-     * Sets or retrieves whether the browser automatically performs wordwrap.
-     */
-    noWrap: boolean;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDivElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDivElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLDivElement: {
-    prototype: HTMLDivElement;
-    new(): HTMLDivElement;
-};
-
-interface HTMLDocument extends Document {
-    addEventListener<K extends keyof DocumentEventMap>(type: K, listener: (this: HTMLDocument, ev: DocumentEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof DocumentEventMap>(type: K, listener: (this: HTMLDocument, ev: DocumentEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLDocument: {
-    prototype: HTMLDocument;
-    new(): HTMLDocument;
-};
-
-interface HTMLElementEventMap extends ElementEventMap {
-    "abort": UIEvent;
-    "activate": Event;
-    "beforeactivate": Event;
-    "beforecopy": Event;
-    "beforecut": Event;
-    "beforedeactivate": Event;
-    "beforepaste": Event;
-    "blur": FocusEvent;
-    "canplay": Event;
-    "canplaythrough": Event;
-    "change": Event;
-    "click": MouseEvent;
-    "contextmenu": PointerEvent;
-    "copy": ClipboardEvent;
-    "cuechange": Event;
-    "cut": ClipboardEvent;
-    "dblclick": MouseEvent;
-    "deactivate": Event;
-    "drag": DragEvent;
-    "dragend": DragEvent;
-    "dragenter": DragEvent;
-    "dragleave": DragEvent;
-    "dragover": DragEvent;
-    "dragstart": DragEvent;
-    "drop": DragEvent;
-    "durationchange": Event;
-    "emptied": Event;
-    "ended": Event;
-    "error": ErrorEvent;
-    "focus": FocusEvent;
-    "input": Event;
-    "invalid": Event;
-    "keydown": KeyboardEvent;
-    "keypress": KeyboardEvent;
-    "keyup": KeyboardEvent;
-    "load": Event;
-    "loadeddata": Event;
-    "loadedmetadata": Event;
-    "loadstart": Event;
-    "mousedown": MouseEvent;
-    "mouseenter": MouseEvent;
-    "mouseleave": MouseEvent;
-    "mousemove": MouseEvent;
-    "mouseout": MouseEvent;
-    "mouseover": MouseEvent;
-    "mouseup": MouseEvent;
-    "mousewheel": WheelEvent;
-    "MSContentZoom": Event;
-    "MSManipulationStateChanged": Event;
-    "paste": ClipboardEvent;
-    "pause": Event;
-    "play": Event;
-    "playing": Event;
-    "progress": ProgressEvent;
-    "ratechange": Event;
-    "reset": Event;
-    "scroll": UIEvent;
-    "seeked": Event;
-    "seeking": Event;
-    "select": UIEvent;
-    "selectstart": Event;
-    "stalled": Event;
-    "submit": Event;
-    "suspend": Event;
-    "timeupdate": Event;
-    "volumechange": Event;
-    "waiting": Event;
-}
-
-interface HTMLElement extends Element, ElementCSSInlineStyle {
-    accessKey: string;
-    contentEditable: string;
-    readonly dataset: DOMStringMap;
-    dir: string;
-    draggable: boolean;
-    hidden: boolean;
-    hideFocus: boolean;
-    innerText: string;
-    readonly isContentEditable: boolean;
-    lang: string;
-    readonly offsetHeight: number;
-    readonly offsetLeft: number;
-    readonly offsetParent: Element;
-    readonly offsetTop: number;
-    readonly offsetWidth: number;
-    onabort: ((this: HTMLElement, ev: UIEvent) => any) | null;
-    onactivate: ((this: HTMLElement, ev: Event) => any) | null;
-    onbeforeactivate: ((this: HTMLElement, ev: Event) => any) | null;
-    onbeforecopy: ((this: HTMLElement, ev: Event) => any) | null;
-    onbeforecut: ((this: HTMLElement, ev: Event) => any) | null;
-    onbeforedeactivate: ((this: HTMLElement, ev: Event) => any) | null;
-    onbeforepaste: ((this: HTMLElement, ev: Event) => any) | null;
-    onblur: ((this: HTMLElement, ev: FocusEvent) => any) | null;
-    oncanplay: ((this: HTMLElement, ev: Event) => any) | null;
-    oncanplaythrough: ((this: HTMLElement, ev: Event) => any) | null;
-    onchange: ((this: HTMLElement, ev: Event) => any) | null;
-    onclick: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    oncontextmenu: ((this: HTMLElement, ev: PointerEvent) => any) | null;
-    oncopy: ((this: HTMLElement, ev: ClipboardEvent) => any) | null;
-    oncuechange: ((this: HTMLElement, ev: Event) => any) | null;
-    oncut: ((this: HTMLElement, ev: ClipboardEvent) => any) | null;
-    ondblclick: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    ondeactivate: ((this: HTMLElement, ev: Event) => any) | null;
-    ondrag: ((this: HTMLElement, ev: DragEvent) => any) | null;
-    ondragend: ((this: HTMLElement, ev: DragEvent) => any) | null;
-    ondragenter: ((this: HTMLElement, ev: DragEvent) => any) | null;
-    ondragleave: ((this: HTMLElement, ev: DragEvent) => any) | null;
-    ondragover: ((this: HTMLElement, ev: DragEvent) => any) | null;
-    ondragstart: ((this: HTMLElement, ev: DragEvent) => any) | null;
-    ondrop: ((this: HTMLElement, ev: DragEvent) => any) | null;
-    ondurationchange: ((this: HTMLElement, ev: Event) => any) | null;
-    onemptied: ((this: HTMLElement, ev: Event) => any) | null;
-    onended: ((this: HTMLElement, ev: Event) => any) | null;
-    onerror: ((this: HTMLElement, ev: ErrorEvent) => any) | null;
-    onfocus: ((this: HTMLElement, ev: FocusEvent) => any) | null;
-    oninput: ((this: HTMLElement, ev: Event) => any) | null;
-    oninvalid: ((this: HTMLElement, ev: Event) => any) | null;
-    onkeydown: ((this: HTMLElement, ev: KeyboardEvent) => any) | null;
-    onkeypress: ((this: HTMLElement, ev: KeyboardEvent) => any) | null;
-    onkeyup: ((this: HTMLElement, ev: KeyboardEvent) => any) | null;
-    onload: ((this: HTMLElement, ev: Event) => any) | null;
-    onloadeddata: ((this: HTMLElement, ev: Event) => any) | null;
-    onloadedmetadata: ((this: HTMLElement, ev: Event) => any) | null;
-    onloadstart: ((this: HTMLElement, ev: Event) => any) | null;
-    onmousedown: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    onmouseenter: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    onmouseleave: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    onmousemove: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    onmouseout: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    onmouseover: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    onmouseup: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    onmousewheel: ((this: HTMLElement, ev: WheelEvent) => any) | null;
-    onmscontentzoom: ((this: HTMLElement, ev: Event) => any) | null;
-    onmsmanipulationstatechanged: ((this: HTMLElement, ev: Event) => any) | null;
-    onpaste: ((this: HTMLElement, ev: ClipboardEvent) => any) | null;
-    onpause: ((this: HTMLElement, ev: Event) => any) | null;
-    onplay: ((this: HTMLElement, ev: Event) => any) | null;
-    onplaying: ((this: HTMLElement, ev: Event) => any) | null;
-    onprogress: ((this: HTMLElement, ev: ProgressEvent) => any) | null;
-    onratechange: ((this: HTMLElement, ev: Event) => any) | null;
-    onreset: ((this: HTMLElement, ev: Event) => any) | null;
-    onscroll: ((this: HTMLElement, ev: UIEvent) => any) | null;
-    onseeked: ((this: HTMLElement, ev: Event) => any) | null;
-    onseeking: ((this: HTMLElement, ev: Event) => any) | null;
-    onselect: ((this: HTMLElement, ev: UIEvent) => any) | null;
-    onselectstart: ((this: HTMLElement, ev: Event) => any) | null;
-    onstalled: ((this: HTMLElement, ev: Event) => any) | null;
-    onsubmit: ((this: HTMLElement, ev: Event) => any) | null;
-    onsuspend: ((this: HTMLElement, ev: Event) => any) | null;
-    ontimeupdate: ((this: HTMLElement, ev: Event) => any) | null;
-    onvolumechange: ((this: HTMLElement, ev: Event) => any) | null;
-    onwaiting: ((this: HTMLElement, ev: Event) => any) | null;
-    outerText: string;
-    spellcheck: boolean;
-    tabIndex: number;
-    title: string;
-    animate(keyframes: AnimationKeyFrame | AnimationKeyFrame[], options: number | AnimationOptions): Animation;
-    blur(): void;
-    click(): void;
-    dragDrop(): boolean;
-    focus(): void;
-    msGetInputContext(): MSInputMethodContext;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLElement: {
-    prototype: HTMLElement;
-    new(): HTMLElement;
-};
-
-interface HTMLEmbedElement extends HTMLElement, GetSVGDocument {
-    /**
-     * Sets or retrieves the height of the object.
-     */
-    height: string;
-    hidden: any;
-    /**
-     * Gets or sets whether the DLNA PlayTo device is available.
-     */
-    msPlayToDisabled: boolean;
-    /**
-     * Gets or sets the path to the preferred media source. This enables the Play To target device to stream the media content, which can be DRM protected, from a different location, such as a cloud media server.
-     */
-    msPlayToPreferredSourceUri: string;
-    /**
-     * Gets or sets the primary DLNA PlayTo device.
-     */
-    msPlayToPrimary: boolean;
-    /**
-     * Gets the source associated with the media element for use by the PlayToManager.
-     */
-    readonly msPlayToSource: any;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    /** @deprecated */
-    name: string;
-    /**
-     * Retrieves the palette used for the embedded document.
-     */
-    readonly palette: string;
-    /**
-     * Retrieves the URL of the plug-in used to view an embedded document.
-     */
-    readonly pluginspage: string;
-    readonly readyState: string;
-    /**
-     * Sets or retrieves a URL to be loaded by the object.
-     */
-    src: string;
-    /**
-     * Sets or retrieves the height and width units of the embed object.
-     */
-    units: string;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    width: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLEmbedElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLEmbedElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLEmbedElement: {
-    prototype: HTMLEmbedElement;
-    new(): HTMLEmbedElement;
-};
-
-interface HTMLFieldSetElement extends HTMLElement {
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    align: string;
-    disabled: boolean;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    name: string;
-    /**
-     * Returns the error message that would be displayed if the user submits the form, or an empty string if no error message. It also triggers the standard error message, such as "this is a required field". The result is that the user sees validation messages without actually submitting.
-     */
-    readonly validationMessage: string;
-    /**
-     * Returns a  ValidityState object that represents the validity states of an element.
-     */
-    readonly validity: ValidityState;
-    /**
-     * Returns whether an element will successfully validate based on forms validation rules and constraints.
-     */
-    readonly willValidate: boolean;
-    /**
-     * Returns whether a form will validate when it is submitted, without having to submit it.
-     */
-    checkValidity(): boolean;
-    /**
-     * Sets a custom error message that is displayed when a form is submitted.
-     * @param error Sets a custom error message that is displayed when a form is submitted.
-     */
-    setCustomValidity(error: string): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLFieldSetElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLFieldSetElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLFieldSetElement: {
-    prototype: HTMLFieldSetElement;
-    new(): HTMLFieldSetElement;
-};
-
-interface HTMLFontElement extends HTMLElement, DOML2DeprecatedColorProperty, DOML2DeprecatedSizeProperty {
-    /**
-     * Sets or retrieves the current typeface family.
-     */
-    /** @deprecated */
-    face: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLFontElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLFontElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLFontElement: {
-    prototype: HTMLFontElement;
-    new(): HTMLFontElement;
-};
-
-interface HTMLFormControlsCollection extends HTMLCollectionBase {
-    namedItem(name: string): HTMLCollection | Element | null;
-}
-
-declare var HTMLFormControlsCollection: {
-    prototype: HTMLFormControlsCollection;
-    new(): HTMLFormControlsCollection;
-};
-
-interface HTMLFormElement extends HTMLElement {
-    /**
-     * Sets or retrieves a list of character encodings for input data that must be accepted by the server processing the form.
-     */
-    acceptCharset: string;
-    /**
-     * Sets or retrieves the URL to which the form content is sent for processing.
-     */
-    action: string;
-    /**
-     * Specifies whether autocomplete is applied to an editable text field.
-     */
-    autocomplete: string;
-    /**
-     * Retrieves a collection, in source order, of all controls in a given form.
-     */
-    readonly elements: HTMLFormControlsCollection;
-    /**
-     * Sets or retrieves the MIME encoding for the form.
-     */
-    encoding: string;
-    /**
-     * Sets or retrieves the encoding type for the form.
-     */
-    enctype: string;
-    /**
-     * Sets or retrieves the number of objects in a collection.
-     */
-    readonly length: number;
-    /**
-     * Sets or retrieves how to send the form data to the server.
-     */
-    method: string;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    name: string;
-    /**
-     * Designates a form that is not validated when submitted.
-     */
-    noValidate: boolean;
-    /**
-     * Sets or retrieves the window or frame at which to target content.
-     */
-    target: string;
-    /**
-     * Returns whether a form will validate when it is submitted, without having to submit it.
-     */
-    checkValidity(): boolean;
-    /**
-     * Retrieves a form object or an object from an elements collection.
-     * @param name Variant of type Number or String that specifies the object or collection to retrieve. If this parameter is a Number, it is the zero-based index of the object. If this parameter is a string, all objects with matching name or id properties are retrieved, and a collection is returned if more than one match is made.
-     * @param index Variant of type Number that specifies the zero-based index of the object to retrieve when a collection is returned.
-     */
-    item(name?: any, index?: any): any;
-    /**
-     * Retrieves a form object or an object from an elements collection.
-     */
-    namedItem(name: string): any;
-    reportValidity(): boolean;
-    /**
-     * Fires when the user resets a form.
-     */
-    reset(): void;
-    /**
-     * Fires when a FORM is about to be submitted.
-     */
-    submit(): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLFormElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLFormElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-    [name: string]: any;
-}
-
-declare var HTMLFormElement: {
-    prototype: HTMLFormElement;
-    new(): HTMLFormElement;
-};
-
-interface HTMLFrameElementEventMap extends HTMLElementEventMap {
-    "load": Event;
-}
-
-interface HTMLFrameElement extends HTMLElement, GetSVGDocument {
-    /**
-     * Specifies the properties of a border drawn around an object.
-     */
-    border: string;
-    /**
-     * Sets or retrieves the border color of the object.
-     */
-    borderColor: any;
-    /**
-     * Retrieves the document object of the page or frame.
-     */
-    /** @deprecated */
-    readonly contentDocument: Document | null;
-    /**
-     * Retrieves the object of the specified.
-     */
-    /** @deprecated */
-    readonly contentWindow: Window | null;
-    /**
-     * Sets or retrieves whether to display a border for the frame.
-     */
-    /** @deprecated */
-    frameBorder: string;
-    /**
-     * Sets or retrieves the amount of additional space between the frames.
-     */
-    frameSpacing: any;
-    /**
-     * Sets or retrieves the height of the object.
-     */
-    height: string | number;
-    /**
-     * Sets or retrieves a URI to a long description of the object.
-     */
-    /** @deprecated */
-    longDesc: string;
-    /**
-     * Sets or retrieves the top and bottom margin heights before displaying the text in a frame.
-     */
-    /** @deprecated */
-    marginHeight: string;
-    /**
-     * Sets or retrieves the left and right margin widths before displaying the text in a frame.
-     */
-    /** @deprecated */
-    marginWidth: string;
-    /**
-     * Sets or retrieves the frame name.
-     */
-    /** @deprecated */
-    name: string;
-    /**
-     * Sets or retrieves whether the user can resize the frame.
-     */
-    /** @deprecated */
-    noResize: boolean;
-    /**
-     * Sets or retrieves whether the frame can be scrolled.
-     */
-    /** @deprecated */
-    scrolling: string;
-    /**
-     * Sets or retrieves a URL to be loaded by the object.
-     */
-    /** @deprecated */
-    src: string;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    width: string | number;
-    addEventListener<K extends keyof HTMLFrameElementEventMap>(type: K, listener: (this: HTMLFrameElement, ev: HTMLFrameElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLFrameElementEventMap>(type: K, listener: (this: HTMLFrameElement, ev: HTMLFrameElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLFrameElement: {
-    prototype: HTMLFrameElement;
-    new(): HTMLFrameElement;
-};
-
-interface HTMLFrameSetElementEventMap extends HTMLElementEventMap, WindowEventHandlersEventMap {
-    "blur": FocusEvent;
-    "error": ErrorEvent;
-    "focus": FocusEvent;
-    "load": Event;
-    "orientationchange": Event;
-    "resize": UIEvent;
-    "scroll": UIEvent;
-}
-
-interface HTMLFrameSetElement extends HTMLElement, WindowEventHandlers {
-    /**
-     * Sets or retrieves the frame widths of the object.
-     */
-    /** @deprecated */
-    cols: string;
-    name: string;
-    onorientationchange: ((this: HTMLFrameSetElement, ev: Event) => any) | null;
-    onresize: ((this: HTMLFrameSetElement, ev: UIEvent) => any) | null;
-    /**
-     * Sets or retrieves the frame heights of the object.
-     */
-    /** @deprecated */
-    rows: string;
-    addEventListener<K extends keyof HTMLFrameSetElementEventMap>(type: K, listener: (this: HTMLFrameSetElement, ev: HTMLFrameSetElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLFrameSetElementEventMap>(type: K, listener: (this: HTMLFrameSetElement, ev: HTMLFrameSetElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLFrameSetElement: {
-    prototype: HTMLFrameSetElement;
-    new(): HTMLFrameSetElement;
-};
-
-interface HTMLHRElement extends HTMLElement, DOML2DeprecatedColorProperty, DOML2DeprecatedSizeProperty {
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    /** @deprecated */
-    align: string;
-    /**
-     * Sets or retrieves whether the horizontal rule is drawn with 3-D shading.
-     */
-    /** @deprecated */
-    noShade: boolean;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    /** @deprecated */
-    width: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLHRElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLHRElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLHRElement: {
-    prototype: HTMLHRElement;
-    new(): HTMLHRElement;
-};
-
-interface HTMLHeadElement extends HTMLElement {
-    /** @deprecated */
-    profile: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLHeadElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLHeadElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLHeadElement: {
-    prototype: HTMLHeadElement;
-    new(): HTMLHeadElement;
-};
-
-interface HTMLHeadingElement extends HTMLElement {
-    /**
-     * Sets or retrieves a value that indicates the table alignment.
-     */
-    /** @deprecated */
-    align: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLHeadingElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLHeadingElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLHeadingElement: {
-    prototype: HTMLHeadingElement;
-    new(): HTMLHeadingElement;
-};
-
-interface HTMLHtmlElement extends HTMLElement {
-    /**
-     * Sets or retrieves the DTD version that governs the current document.
-     */
-    /** @deprecated */
-    version: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLHtmlElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLHtmlElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLHtmlElement: {
-    prototype: HTMLHtmlElement;
-    new(): HTMLHtmlElement;
-};
-
-interface HTMLHyperlinkElementUtils {
-    hash: string;
-    host: string;
-    hostname: string;
-    href: string;
-    origin: string;
-    pathname: string;
-    port: string;
-    protocol: string;
-    search: string;
-    toString(): string;
-}
-
-interface HTMLIFrameElementEventMap extends HTMLElementEventMap {
-    "load": Event;
-}
-
-interface HTMLIFrameElement extends HTMLElement, GetSVGDocument {
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    /** @deprecated */
-    align: string;
-    allowFullscreen: boolean;
-    allowPaymentRequest: boolean;
-    /**
-     * Retrieves the document object of the page or frame.
-     */
-    readonly contentDocument: Document | null;
-    /**
-     * Retrieves the object of the specified.
-     */
-    readonly contentWindow: Window | null;
-    /**
-     * Sets or retrieves whether to display a border for the frame.
-     */
-    /** @deprecated */
-    frameBorder: string;
-    /**
-     * Sets or retrieves the height of the object.
-     */
-    height: string;
-    /**
-     * Sets or retrieves a URI to a long description of the object.
-     */
-    /** @deprecated */
-    longDesc: string;
-    /**
-     * Sets or retrieves the top and bottom margin heights before displaying the text in a frame.
-     */
-    /** @deprecated */
-    marginHeight: string;
-    /**
-     * Sets or retrieves the left and right margin widths before displaying the text in a frame.
-     */
-    /** @deprecated */
-    marginWidth: string;
-    /**
-     * Sets or retrieves the frame name.
-     */
-    name: string;
-    readonly sandbox: DOMTokenList;
-    /**
-     * Sets or retrieves whether the frame can be scrolled.
-     */
-    /** @deprecated */
-    scrolling: string;
-    /**
-     * Sets or retrieves a URL to be loaded by the object.
-     */
-    src: string;
-    /**
-     * Sets or retrives the content of the page that is to contain.
-     */
-    srcdoc: string;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    width: string;
-    addEventListener<K extends keyof HTMLIFrameElementEventMap>(type: K, listener: (this: HTMLIFrameElement, ev: HTMLIFrameElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLIFrameElementEventMap>(type: K, listener: (this: HTMLIFrameElement, ev: HTMLIFrameElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLIFrameElement: {
-    prototype: HTMLIFrameElement;
-    new(): HTMLIFrameElement;
-};
-
-interface HTMLImageElement extends HTMLElement {
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    /** @deprecated */
-    align: string;
-    /**
-     * Sets or retrieves a text alternative to the graphic.
-     */
-    alt: string;
-    /**
-     * Specifies the properties of a border drawn around an object.
-     */
-    /** @deprecated */
-    border: string;
-    /**
-     * Retrieves whether the object is fully loaded.
-     */
-    readonly complete: boolean;
-    crossOrigin: string | null;
-    readonly currentSrc: string;
-    decoding: "async" | "sync" | "auto";
-    /**
-     * Sets or retrieves the height of the object.
-     */
-    height: number;
-    /**
-     * Sets or retrieves the width of the border to draw around the object.
-     */
-    /** @deprecated */
-    hspace: number;
-    /**
-     * Sets or retrieves whether the image is a server-side image map.
-     */
-    isMap: boolean;
-    /**
-     * Sets or retrieves a Uniform Resource Identifier (URI) to a long description of the object.
-     */
-    longDesc: string;
-    /** @deprecated */
-    lowsrc: string;
-    /**
-     * Gets or sets whether the DLNA PlayTo device is available.
-     */
-    msPlayToDisabled: boolean;
-    msPlayToPreferredSourceUri: string;
-    /**
-     * Gets or sets the primary DLNA PlayTo device.
-     */
-    msPlayToPrimary: boolean;
-    /**
-     * Gets the source associated with the media element for use by the PlayToManager.
-     */
-    readonly msPlayToSource: any;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    /** @deprecated */
-    name: string;
-    /**
-     * The original height of the image resource before sizing.
-     */
-    readonly naturalHeight: number;
-    /**
-     * The original width of the image resource before sizing.
-     */
-    readonly naturalWidth: number;
-    sizes: string;
-    /**
-     * The address or URL of the a media resource that is to be considered.
-     */
-    src: string;
-    srcset: string;
-    /**
-     * Sets or retrieves the URL, often with a bookmark extension (#name), to use as a client-side image map.
-     */
-    useMap: string;
-    /**
-     * Sets or retrieves the vertical margin for the object.
-     */
-    /** @deprecated */
-    vspace: number;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    width: number;
-    readonly x: number;
-    readonly y: number;
-    msGetAsCastingSource(): any;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLImageElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLImageElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLImageElement: {
-    prototype: HTMLImageElement;
-    new(): HTMLImageElement;
-};
-
-interface HTMLInputElement extends HTMLElement {
-    /**
-     * Sets or retrieves a comma-separated list of content types.
-     */
-    accept: string;
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    /** @deprecated */
-    align: string;
-    /**
-     * Sets or retrieves a text alternative to the graphic.
-     */
-    alt: string;
-    /**
-     * Specifies whether autocomplete is applied to an editable text field.
-     */
-    autocomplete: string;
-    /**
-     * Provides a way to direct a user to a specific field when a document loads. This can provide both direction and convenience for a user, reducing the need to click or tab to a field when a page opens. This attribute is true when present on an element, and false when missing.
-     */
-    autofocus: boolean;
-    /**
-     * Sets or retrieves the state of the check box or radio button.
-     */
-    checked: boolean;
-    /**
-     * Sets or retrieves the state of the check box or radio button.
-     */
-    defaultChecked: boolean;
-    /**
-     * Sets or retrieves the initial contents of the object.
-     */
-    defaultValue: string;
-    disabled: boolean;
-    /**
-     * Returns a FileList object on a file type input object.
-     */
-    files: FileList | null;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Overrides the action attribute (where the data on a form is sent) on the parent form element.
-     */
-    formAction: string;
-    /**
-     * Used to override the encoding (formEnctype attribute) specified on the form element.
-     */
-    formEnctype: string;
-    /**
-     * Overrides the submit method attribute previously specified on a form element.
-     */
-    formMethod: string;
-    /**
-     * Overrides any validation or required attributes on a form or form elements to allow it to be submitted without validation. This can be used to create a "save draft"-type submit option.
-     */
-    formNoValidate: boolean;
-    /**
-     * Overrides the target attribute on a form element.
-     */
-    formTarget: string;
-    /**
-     * Sets or retrieves the height of the object.
-     */
-    height: number;
-    indeterminate: boolean;
-    /**
-     * Specifies the ID of a pre-defined datalist of options for an input element.
-     */
-    readonly list: HTMLElement | null;
-    /**
-     * Defines the maximum acceptable value for an input element with type="number".When used with the min and step attributes, lets you control the range and increment (such as only even numbers) that the user can enter into an input field.
-     */
-    max: string;
-    /**
-     * Sets or retrieves the maximum number of characters that the user can enter in a text control.
-     */
-    maxLength: number;
-    /**
-     * Defines the minimum acceptable value for an input element with type="number". When used with the max and step attributes, lets you control the range and increment (such as even numbers only) that the user can enter into an input field.
-     */
-    min: string;
-    minLength: number;
-    /**
-     * Sets or retrieves the Boolean value indicating whether multiple items can be selected from a list.
-     */
-    multiple: boolean;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    name: string;
-    /**
-     * Gets or sets a string containing a regular expression that the user's input must match.
-     */
-    pattern: string;
-    /**
-     * Gets or sets a text string that is displayed in an input field as a hint or prompt to users as the format or type of information they need to enter.The text appears in an input field until the user puts focus on the field.
-     */
-    placeholder: string;
-    readOnly: boolean;
-    /**
-     * When present, marks an element that can't be submitted without a value.
-     */
-    required: boolean;
-    selectionDirection: string | null;
-    /**
-     * Gets or sets the end position or offset of a text selection.
-     */
-    selectionEnd: number | null;
-    /**
-     * Gets or sets the starting position or offset of a text selection.
-     */
-    selectionStart: number | null;
-    size: number;
-    /**
-     * The address or URL of the a media resource that is to be considered.
-     */
-    src: string;
-    /**
-     * Defines an increment or jump between values that you want to allow the user to enter. When used with the max and min attributes, lets you control the range and increment (for example, allow only even numbers) that the user can enter into an input field.
-     */
-    step: string;
-    /**
-     * Returns the content type of the object.
-     */
-    type: string;
-    /**
-     * Sets or retrieves the URL, often with a bookmark extension (#name), to use as a client-side image map.
-     */
-    /** @deprecated */
-    useMap: string;
-    /**
-     * Returns the error message that would be displayed if the user submits the form, or an empty string if no error message. It also triggers the standard error message, such as "this is a required field". The result is that the user sees validation messages without actually submitting.
-     */
-    readonly validationMessage: string;
-    /**
-     * Returns a  ValidityState object that represents the validity states of an element.
-     */
-    readonly validity: ValidityState;
-    /**
-     * Returns the value of the data at the cursor's current position.
-     */
-    value: string;
-    valueAsDate: any;
-    /**
-     * Returns the input field value as a number.
-     */
-    valueAsNumber: number;
-    webkitdirectory: boolean;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    width: number;
-    /**
-     * Returns whether an element will successfully validate based on forms validation rules and constraints.
-     */
-    readonly willValidate: boolean;
-    /**
-     * Returns whether a form will validate when it is submitted, without having to submit it.
-     */
-    checkValidity(): boolean;
-    /**
-     * Makes the selection equal to the current object.
-     */
-    select(): void;
-    /**
-     * Sets a custom error message that is displayed when a form is submitted.
-     * @param error Sets a custom error message that is displayed when a form is submitted.
-     */
-    setCustomValidity(error: string): void;
-    /**
-     * Sets the start and end positions of a selection in a text field.
-     * @param start The offset into the text field for the start of the selection.
-     * @param end The offset into the text field for the end of the selection.
-     * @param direction The direction in which the selection is performed.
-     */
-    setSelectionRange(start: number, end: number, direction?: "forward" | "backward" | "none"): void;
-    /**
-     * Decrements a range input control's value by the value given by the Step attribute. If the optional parameter is used, it will decrement the input control's step value multiplied by the parameter's value.
-     * @param n Value to decrement the value by.
-     */
-    stepDown(n?: number): void;
-    /**
-     * Increments a range input control's value by the value given by the Step attribute. If the optional parameter is used, will increment the input control's value by that value.
-     * @param n Value to increment the value by.
-     */
-    stepUp(n?: number): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLInputElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLInputElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLInputElement: {
-    prototype: HTMLInputElement;
-    new(): HTMLInputElement;
-};
-
-interface HTMLLIElement extends HTMLElement {
-    /** @deprecated */
-    type: string;
-    /**
-     * Sets or retrieves the value of a list item.
-     */
-    value: number;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLLIElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLLIElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLLIElement: {
-    prototype: HTMLLIElement;
-    new(): HTMLLIElement;
-};
-
-interface HTMLLabelElement extends HTMLElement {
-    readonly control: HTMLInputElement | null;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Sets or retrieves the object to which the given label object is assigned.
-     */
-    htmlFor: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLLabelElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLLabelElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLLabelElement: {
-    prototype: HTMLLabelElement;
-    new(): HTMLLabelElement;
-};
-
-interface HTMLLegendElement extends HTMLElement {
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    /** @deprecated */
-    align: string;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLLegendElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLLegendElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLLegendElement: {
-    prototype: HTMLLegendElement;
-    new(): HTMLLegendElement;
-};
-
-interface HTMLLinkElement extends HTMLElement, LinkStyle {
-    /**
-     * Sets or retrieves the character set used to encode the object.
-     */
-    /** @deprecated */
-    charset: string;
-    crossOrigin: string | null;
-    /** @deprecated */
-    disabled: boolean;
-    /**
-     * Sets or retrieves a destination URL or an anchor point.
-     */
-    href: string;
-    /**
-     * Sets or retrieves the language code of the object.
-     */
-    hreflang: string;
-    import?: Document;
-    integrity: string;
-    /**
-     * Sets or retrieves the media type.
-     */
-    media: string;
-    /**
-     * Sets or retrieves the relationship between the object and the destination of the link.
-     */
-    rel: string;
-    /**
-     * Sets or retrieves the relationship between the object and the destination of the link.
-     */
-    /** @deprecated */
-    rev: string;
-    /**
-     * Sets or retrieves the window or frame at which to target content.
-     */
-    /** @deprecated */
-    target: string;
-    /**
-     * Sets or retrieves the MIME type of the object.
-     */
-    type: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLLinkElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLLinkElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLLinkElement: {
-    prototype: HTMLLinkElement;
-    new(): HTMLLinkElement;
-};
-
-interface HTMLMainElement extends HTMLElement {
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMainElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMainElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLMainElement: {
-    prototype: HTMLMainElement;
-    new(): HTMLMainElement;
-};
-
-interface HTMLMapElement extends HTMLElement {
-    /**
-     * Retrieves a collection of the area objects defined for the given map object.
-     */
-    readonly areas: HTMLAreasCollection;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    name: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMapElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMapElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLMapElement: {
-    prototype: HTMLMapElement;
-    new(): HTMLMapElement;
-};
-
-interface HTMLMarqueeElementEventMap extends HTMLElementEventMap {
-    "bounce": Event;
-    "finish": Event;
-    "start": Event;
-}
-
-interface HTMLMarqueeElement extends HTMLElement {
-    /** @deprecated */
-    behavior: string;
-    /** @deprecated */
-    bgColor: string;
-    /** @deprecated */
-    direction: string;
-    /** @deprecated */
-    height: string;
-    /** @deprecated */
-    hspace: number;
-    /** @deprecated */
-    loop: number;
-    /** @deprecated */
-    onbounce: ((this: HTMLMarqueeElement, ev: Event) => any) | null;
-    /** @deprecated */
-    onfinish: ((this: HTMLMarqueeElement, ev: Event) => any) | null;
-    /** @deprecated */
-    onstart: ((this: HTMLMarqueeElement, ev: Event) => any) | null;
-    /** @deprecated */
-    scrollAmount: number;
-    /** @deprecated */
-    scrollDelay: number;
-    /** @deprecated */
-    trueSpeed: boolean;
-    /** @deprecated */
-    vspace: number;
-    /** @deprecated */
-    width: string;
-    /** @deprecated */
-    start(): void;
-    /** @deprecated */
-    stop(): void;
-    addEventListener<K extends keyof HTMLMarqueeElementEventMap>(type: K, listener: (this: HTMLMarqueeElement, ev: HTMLMarqueeElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLMarqueeElementEventMap>(type: K, listener: (this: HTMLMarqueeElement, ev: HTMLMarqueeElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLMarqueeElement: {
-    prototype: HTMLMarqueeElement;
-    new(): HTMLMarqueeElement;
-};
-
-interface HTMLMediaElementEventMap extends HTMLElementEventMap {
-    "encrypted": MediaEncryptedEvent;
-    "msneedkey": Event;
-}
-
-interface HTMLMediaElement extends HTMLElement {
-    /**
-     * Returns an AudioTrackList object with the audio tracks for a given video element.
-     */
-    readonly audioTracks: AudioTrackList;
-    /**
-     * Gets or sets a value that indicates whether to start playing the media automatically.
-     */
-    autoplay: boolean;
-    /**
-     * Gets a collection of buffered time ranges.
-     */
-    readonly buffered: TimeRanges;
-    /**
-     * Gets or sets a flag that indicates whether the client provides a set of controls for the media (in case the developer does not include controls for the player).
-     */
-    controls: boolean;
-    crossOrigin: string | null;
-    /**
-     * Gets the address or URL of the current media resource that is selected by IHTMLMediaElement.
-     */
-    readonly currentSrc: string;
-    /**
-     * Gets or sets the current playback position, in seconds.
-     */
-    currentTime: number;
-    defaultMuted: boolean;
-    /**
-     * Gets or sets the default playback rate when the user is not using fast forward or reverse for a video or audio resource.
-     */
-    defaultPlaybackRate: number;
-    /**
-     * Returns the duration in seconds of the current media resource. A NaN value is returned if duration is not available, or Infinity if the media resource is streaming.
-     */
-    readonly duration: number;
-    /**
-     * Gets information about whether the playback has ended or not.
-     */
-    readonly ended: boolean;
-    /**
-     * Returns an object representing the current error state of the audio or video element.
-     */
-    readonly error: MediaError | null;
-    /**
-     * Gets or sets a flag to specify whether playback should restart after it completes.
-     */
-    loop: boolean;
-    readonly mediaKeys: MediaKeys | null;
-    /**
-     * Specifies the purpose of the audio or video media, such as background audio or alerts.
-     */
-    msAudioCategory: string;
-    /**
-     * Specifies the output device id that the audio will be sent to.
-     */
-    msAudioDeviceType: string;
-    readonly msGraphicsTrustStatus: MSGraphicsTrust;
-    /**
-     * Gets the MSMediaKeys object, which is used for decrypting media data, that is associated with this media element.
-     */
-    /** @deprecated */
-    readonly msKeys: MSMediaKeys;
-    /**
-     * Gets or sets whether the DLNA PlayTo device is available.
-     */
-    msPlayToDisabled: boolean;
-    /**
-     * Gets or sets the path to the preferred media source. This enables the Play To target device to stream the media content, which can be DRM protected, from a different location, such as a cloud media server.
-     */
-    msPlayToPreferredSourceUri: string;
-    /**
-     * Gets or sets the primary DLNA PlayTo device.
-     */
-    msPlayToPrimary: boolean;
-    /**
-     * Gets the source associated with the media element for use by the PlayToManager.
-     */
-    readonly msPlayToSource: any;
-    /**
-     * Specifies whether or not to enable low-latency playback on the media element.
-     */
-    msRealTime: boolean;
-    /**
-     * Gets or sets a flag that indicates whether the audio (either audio or the audio track on video media) is muted.
-     */
-    muted: boolean;
-    /**
-     * Gets the current network activity for the element.
-     */
-    readonly networkState: number;
-    onencrypted: ((this: HTMLMediaElement, ev: MediaEncryptedEvent) => any) | null;
-    /** @deprecated */
-    onmsneedkey: ((this: HTMLMediaElement, ev: Event) => any) | null;
-    /**
-     * Gets a flag that specifies whether playback is paused.
-     */
-    readonly paused: boolean;
-    /**
-     * Gets or sets the current rate of speed for the media resource to play. This speed is expressed as a multiple of the normal speed of the media resource.
-     */
-    playbackRate: number;
-    /**
-     * Gets TimeRanges for the current media resource that has been played.
-     */
-    readonly played: TimeRanges;
-    /**
-     * Gets or sets the current playback position, in seconds.
-     */
-    preload: string;
-    readonly readyState: number;
-    /**
-     * Returns a TimeRanges object that represents the ranges of the current media resource that can be seeked.
-     */
-    readonly seekable: TimeRanges;
-    /**
-     * Gets a flag that indicates whether the the client is currently moving to a new playback position in the media resource.
-     */
-    readonly seeking: boolean;
-    /**
-     * The address or URL of the a media resource that is to be considered.
-     */
-    src: string;
-    srcObject: MediaStream | MediaSource | Blob | null;
-    readonly textTracks: TextTrackList;
-    readonly videoTracks: VideoTrackList;
-    /**
-     * Gets or sets the volume level for audio portions of the media element.
-     */
-    volume: number;
-    addTextTrack(kind: TextTrackKind, label?: string, language?: string): TextTrack;
-    /**
-     * Returns a string that specifies whether the client can play a given media resource type.
-     */
-    canPlayType(type: string): CanPlayTypeResult;
-    /**
-     * Resets the audio or video object and loads a new media resource.
-     */
-    load(): void;
-    /**
-     * Clears all effects from the media pipeline.
-     */
-    msClearEffects(): void;
-    msGetAsCastingSource(): any;
-    /**
-     * Inserts the specified audio effect into media pipeline.
-     */
-    msInsertAudioEffect(activatableClassId: string, effectRequired: boolean, config?: any): void;
-    /** @deprecated */
-    msSetMediaKeys(mediaKeys: MSMediaKeys): void;
-    /**
-     * Specifies the media protection manager for a given media pipeline.
-     */
-    msSetMediaProtectionManager(mediaProtectionManager?: any): void;
-    /**
-     * Pauses the current playback and sets paused to TRUE. This can be used to test whether the media is playing or paused. You can also use the pause or play events to tell whether the media is playing or not.
-     */
-    pause(): void;
-    /**
-     * Loads and starts playback of a media resource.
-     */
-    play(): Promise<void>;
-    setMediaKeys(mediaKeys: MediaKeys | null): Promise<void>;
-    readonly HAVE_CURRENT_DATA: number;
-    readonly HAVE_ENOUGH_DATA: number;
-    readonly HAVE_FUTURE_DATA: number;
-    readonly HAVE_METADATA: number;
-    readonly HAVE_NOTHING: number;
-    readonly NETWORK_EMPTY: number;
-    readonly NETWORK_IDLE: number;
-    readonly NETWORK_LOADING: number;
-    readonly NETWORK_NO_SOURCE: number;
-    addEventListener<K extends keyof HTMLMediaElementEventMap>(type: K, listener: (this: HTMLMediaElement, ev: HTMLMediaElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLMediaElementEventMap>(type: K, listener: (this: HTMLMediaElement, ev: HTMLMediaElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLMediaElement: {
-    prototype: HTMLMediaElement;
-    new(): HTMLMediaElement;
-    readonly HAVE_CURRENT_DATA: number;
-    readonly HAVE_ENOUGH_DATA: number;
-    readonly HAVE_FUTURE_DATA: number;
-    readonly HAVE_METADATA: number;
-    readonly HAVE_NOTHING: number;
-    readonly NETWORK_EMPTY: number;
-    readonly NETWORK_IDLE: number;
-    readonly NETWORK_LOADING: number;
-    readonly NETWORK_NO_SOURCE: number;
-};
-
-interface HTMLMenuElement extends HTMLElement {
-    /** @deprecated */
-    compact: boolean;
-    type: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMenuElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMenuElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLMenuElement: {
-    prototype: HTMLMenuElement;
-    new(): HTMLMenuElement;
-};
-
-interface HTMLMetaElement extends HTMLElement {
-    /**
-     * Sets or retrieves the character set used to encode the object.
-     */
-    /** @deprecated */
-    charset: string;
-    /**
-     * Gets or sets meta-information to associate with httpEquiv or name.
-     */
-    content: string;
-    /**
-     * Gets or sets information used to bind the value of a content attribute of a meta element to an HTTP response header.
-     */
-    httpEquiv: string;
-    /**
-     * Sets or retrieves the value specified in the content attribute of the meta object.
-     */
-    name: string;
-    /**
-     * Sets or retrieves a scheme to be used in interpreting the value of a property specified for the object.
-     */
-    /** @deprecated */
-    scheme: string;
-    /**
-     * Sets or retrieves the URL property that will be loaded after the specified time has elapsed.
-     */
-    /** @deprecated */
-    url: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMetaElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMetaElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLMetaElement: {
-    prototype: HTMLMetaElement;
-    new(): HTMLMetaElement;
-};
-
-interface HTMLMeterElement extends HTMLElement {
-    high: number;
-    low: number;
-    max: number;
-    min: number;
-    optimum: number;
-    value: number;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMeterElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMeterElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLMeterElement: {
-    prototype: HTMLMeterElement;
-    new(): HTMLMeterElement;
-};
-
-interface HTMLModElement extends HTMLElement {
-    /**
-     * Sets or retrieves reference information about the object.
-     */
-    cite: string;
-    /**
-     * Sets or retrieves the date and time of a modification to the object.
-     */
-    dateTime: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLModElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLModElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLModElement: {
-    prototype: HTMLModElement;
-    new(): HTMLModElement;
-};
-
-interface HTMLOListElement extends HTMLElement {
-    /** @deprecated */
-    compact: boolean;
-    /**
-     * The starting number.
-     */
-    start: number;
-    type: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLOListElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLOListElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLOListElement: {
-    prototype: HTMLOListElement;
-    new(): HTMLOListElement;
-};
-
-interface HTMLObjectElement extends HTMLElement, GetSVGDocument {
-    /**
-     * Retrieves a string of the URL where the object tag can be found. This is often the href of the document that the object is in, or the value set by a base element.
-     */
-    readonly BaseHref: string;
-    /** @deprecated */
-    align: string;
-    /**
-     * Sets or retrieves a character string that can be used to implement your own archive functionality for the object.
-     */
-    /** @deprecated */
-    archive: string;
-    /** @deprecated */
-    border: string;
-    /**
-     * Sets or retrieves the URL of the file containing the compiled Java class.
-     */
-    /** @deprecated */
-    code: string;
-    /**
-     * Sets or retrieves the URL of the component.
-     */
-    /** @deprecated */
-    codeBase: string;
-    /**
-     * Sets or retrieves the Internet media type for the code associated with the object.
-     */
-    /** @deprecated */
-    codeType: string;
-    /**
-     * Retrieves the document object of the page or frame.
-     */
-    readonly contentDocument: Document | null;
-    /**
-     * Sets or retrieves the URL that references the data of the object.
-     */
-    data: string;
-    /** @deprecated */
-    declare: boolean;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Sets or retrieves the height of the object.
-     */
-    height: string;
-    /** @deprecated */
-    hspace: number;
-    /**
-     * Gets or sets whether the DLNA PlayTo device is available.
-     */
-    msPlayToDisabled: boolean;
-    /**
-     * Gets or sets the path to the preferred media source. This enables the Play To target device to stream the media content, which can be DRM protected, from a different location, such as a cloud media server.
-     */
-    msPlayToPreferredSourceUri: string;
-    /**
-     * Gets or sets the primary DLNA PlayTo device.
-     */
-    msPlayToPrimary: boolean;
-    /**
-     * Gets the source associated with the media element for use by the PlayToManager.
-     */
-    readonly msPlayToSource: any;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    name: string;
-    readonly readyState: number;
-    /**
-     * Sets or retrieves a message to be displayed while an object is loading.
-     */
-    /** @deprecated */
-    standby: string;
-    /**
-     * Sets or retrieves the MIME type of the object.
-     */
-    type: string;
-    typemustmatch: boolean;
-    /**
-     * Sets or retrieves the URL, often with a bookmark extension (#name), to use as a client-side image map.
-     */
-    useMap: string;
-    /**
-     * Returns the error message that would be displayed if the user submits the form, or an empty string if no error message. It also triggers the standard error message, such as "this is a required field". The result is that the user sees validation messages without actually submitting.
-     */
-    readonly validationMessage: string;
-    /**
-     * Returns a  ValidityState object that represents the validity states of an element.
-     */
-    readonly validity: ValidityState;
-    /** @deprecated */
-    vspace: number;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    width: string;
-    /**
-     * Returns whether an element will successfully validate based on forms validation rules and constraints.
-     */
-    readonly willValidate: boolean;
-    /**
-     * Returns whether a form will validate when it is submitted, without having to submit it.
-     */
-    checkValidity(): boolean;
-    /**
-     * Sets a custom error message that is displayed when a form is submitted.
-     * @param error Sets a custom error message that is displayed when a form is submitted.
-     */
-    setCustomValidity(error: string): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLObjectElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLObjectElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLObjectElement: {
-    prototype: HTMLObjectElement;
-    new(): HTMLObjectElement;
-};
-
-interface HTMLOptGroupElement extends HTMLElement {
-    disabled: boolean;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Sets or retrieves a value that you can use to implement your own label functionality for the object.
-     */
-    label: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLOptGroupElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLOptGroupElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLOptGroupElement: {
-    prototype: HTMLOptGroupElement;
-    new(): HTMLOptGroupElement;
-};
-
-interface HTMLOptionElement extends HTMLElement {
-    /**
-     * Sets or retrieves the status of an option.
-     */
-    defaultSelected: boolean;
-    disabled: boolean;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Sets or retrieves the ordinal position of an option in a list box.
-     */
-    readonly index: number;
-    /**
-     * Sets or retrieves a value that you can use to implement your own label functionality for the object.
-     */
-    label: string;
-    /**
-     * Sets or retrieves whether the option in the list box is the default item.
-     */
-    selected: boolean;
-    /**
-     * Sets or retrieves the text string specified by the option tag.
-     */
-    text: string;
-    /**
-     * Sets or retrieves the value which is returned to the server when the form control is submitted.
-     */
-    value: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLOptionElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLOptionElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLOptionElement: {
-    prototype: HTMLOptionElement;
-    new(): HTMLOptionElement;
-};
-
-interface HTMLOptionsCollection extends HTMLCollectionOf<HTMLOptionElement> {
-    length: number;
-    selectedIndex: number;
-    add(element: HTMLOptionElement | HTMLOptGroupElement, before?: HTMLElement | number | null): void;
-    remove(index: number): void;
-}
-
-declare var HTMLOptionsCollection: {
-    prototype: HTMLOptionsCollection;
-    new(): HTMLOptionsCollection;
-};
-
-interface HTMLOutputElement extends HTMLElement {
-    defaultValue: string;
-    readonly form: HTMLFormElement | null;
-    readonly htmlFor: DOMTokenList;
-    name: string;
-    readonly type: string;
-    readonly validationMessage: string;
-    readonly validity: ValidityState;
-    value: string;
-    readonly willValidate: boolean;
-    checkValidity(): boolean;
-    reportValidity(): boolean;
-    setCustomValidity(error: string): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLOutputElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLOutputElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLOutputElement: {
-    prototype: HTMLOutputElement;
-    new(): HTMLOutputElement;
-};
-
-interface HTMLParagraphElement extends HTMLElement {
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    /** @deprecated */
-    align: string;
-    clear: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLParagraphElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLParagraphElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLParagraphElement: {
-    prototype: HTMLParagraphElement;
-    new(): HTMLParagraphElement;
-};
-
-interface HTMLParamElement extends HTMLElement {
-    /**
-     * Sets or retrieves the name of an input parameter for an element.
-     */
-    name: string;
-    /**
-     * Sets or retrieves the content type of the resource designated by the value attribute.
-     */
-    /** @deprecated */
-    type: string;
-    /**
-     * Sets or retrieves the value of an input parameter for an element.
-     */
-    value: string;
-    /**
-     * Sets or retrieves the data type of the value attribute.
-     */
-    /** @deprecated */
-    valueType: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLParamElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLParamElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLParamElement: {
-    prototype: HTMLParamElement;
-    new(): HTMLParamElement;
-};
-
-interface HTMLPictureElement extends HTMLElement {
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLPictureElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLPictureElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLPictureElement: {
-    prototype: HTMLPictureElement;
-    new(): HTMLPictureElement;
-};
-
-interface HTMLPreElement extends HTMLElement {
-    /**
-     * Sets or gets a value that you can use to implement your own width functionality for the object.
-     */
-    /** @deprecated */
-    width: number;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLPreElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLPreElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLPreElement: {
-    prototype: HTMLPreElement;
-    new(): HTMLPreElement;
-};
-
-interface HTMLProgressElement extends HTMLElement {
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Defines the maximum, or "done" value for a progress element.
-     */
-    max: number;
-    /**
-     * Returns the quotient of value/max when the value attribute is set (determinate progress bar), or -1 when the value attribute is missing (indeterminate progress bar).
-     */
-    readonly position: number;
-    /**
-     * Sets or gets the current value of a progress element. The value must be a non-negative number between 0 and the max value.
-     */
-    value: number;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLProgressElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLProgressElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLProgressElement: {
-    prototype: HTMLProgressElement;
-    new(): HTMLProgressElement;
-};
-
-interface HTMLQuoteElement extends HTMLElement {
-    /**
-     * Sets or retrieves reference information about the object.
-     */
-    cite: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLQuoteElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLQuoteElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLQuoteElement: {
-    prototype: HTMLQuoteElement;
-    new(): HTMLQuoteElement;
-};
-
-interface HTMLScriptElement extends HTMLElement {
-    async: boolean;
-    /**
-     * Sets or retrieves the character set used to encode the object.
-     */
-    charset: string;
-    crossOrigin: string | null;
-    /**
-     * Sets or retrieves the status of the script.
-     */
-    defer: boolean;
-    /**
-     * Sets or retrieves the event for which the script is written.
-     */
-    /** @deprecated */
-    event: string;
-    /**
-     * Sets or retrieves the object that is bound to the event script.
-     */
-    /** @deprecated */
-    htmlFor: string;
-    integrity: string;
-    noModule: boolean;
-    /**
-     * Retrieves the URL to an external file that contains the source code or data.
-     */
-    src: string;
-    /**
-     * Retrieves or sets the text of the object as a string.
-     */
-    text: string;
-    /**
-     * Sets or retrieves the MIME type for the associated scripting engine.
-     */
-    type: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLScriptElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLScriptElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLScriptElement: {
-    prototype: HTMLScriptElement;
-    new(): HTMLScriptElement;
-};
-
-interface HTMLSelectElement extends HTMLElement {
-    /**
-     * Provides a way to direct a user to a specific field when a document loads. This can provide both direction and convenience for a user, reducing the need to click or tab to a field when a page opens. This attribute is true when present on an element, and false when missing.
-     */
-    autofocus: boolean;
-    disabled: boolean;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Sets or retrieves the number of objects in a collection.
-     */
-    length: number;
-    /**
-     * Sets or retrieves the Boolean value indicating whether multiple items can be selected from a list.
-     */
-    multiple: boolean;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    name: string;
-    readonly options: HTMLOptionsCollection;
-    /**
-     * When present, marks an element that can't be submitted without a value.
-     */
-    required: boolean;
-    /**
-     * Sets or retrieves the index of the selected option in a select object.
-     */
-    selectedIndex: number;
-    readonly selectedOptions: HTMLCollectionOf<HTMLOptionElement>;
-    /**
-     * Sets or retrieves the number of rows in the list box.
-     */
-    size: number;
-    /**
-     * Retrieves the type of select control based on the value of the MULTIPLE attribute.
-     */
-    readonly type: string;
-    /**
-     * Returns the error message that would be displayed if the user submits the form, or an empty string if no error message. It also triggers the standard error message, such as "this is a required field". The result is that the user sees validation messages without actually submitting.
-     */
-    readonly validationMessage: string;
-    /**
-     * Returns a  ValidityState object that represents the validity states of an element.
-     */
-    readonly validity: ValidityState;
-    /**
-     * Sets or retrieves the value which is returned to the server when the form control is submitted.
-     */
-    value: string;
-    /**
-     * Returns whether an element will successfully validate based on forms validation rules and constraints.
-     */
-    readonly willValidate: boolean;
-    /**
-     * Adds an element to the areas, controlRange, or options collection.
-     * @param element Variant of type Number that specifies the index position in the collection where the element is placed. If no value is given, the method places the element at the end of the collection.
-     * @param before Variant of type Object that specifies an element to insert before, or null to append the object to the collection.
-     */
-    add(element: HTMLOptionElement | HTMLOptGroupElement, before?: HTMLElement | number | null): void;
-    /**
-     * Returns whether a form will validate when it is submitted, without having to submit it.
-     */
-    checkValidity(): boolean;
-    /**
-     * Retrieves a select object or an object from an options collection.
-     * @param name Variant of type Number or String that specifies the object or collection to retrieve. If this parameter is an integer, it is the zero-based index of the object. If this parameter is a string, all objects with matching name or id properties are retrieved, and a collection is returned if more than one match is made.
-     * @param index Variant of type Number that specifies the zero-based index of the object to retrieve when a collection is returned.
-     */
-    item(name?: any, index?: any): Element | null;
-    /**
-     * Retrieves a select object or an object from an options collection.
-     * @param namedItem A String that specifies the name or id property of the object to retrieve. A collection is returned if more than one match is made.
-     */
-    namedItem(name: string): any;
-    /**
-     * Removes an element from the collection.
-     * @param index Number that specifies the zero-based index of the element to remove from the collection.
-     */
-    remove(index?: number): void;
-    /**
-     * Sets a custom error message that is displayed when a form is submitted.
-     * @param error Sets a custom error message that is displayed when a form is submitted.
-     */
-    setCustomValidity(error: string): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSelectElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSelectElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-    [name: string]: any;
-}
-
-declare var HTMLSelectElement: {
-    prototype: HTMLSelectElement;
-    new(): HTMLSelectElement;
-};
-
-interface HTMLSlotElement extends HTMLElement {
-    name: string;
-    assignedNodes(options?: AssignedNodesOptions): Node[];
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSlotElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSlotElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-interface HTMLSourceElement extends HTMLElement {
-    /**
-     * Gets or sets the intended media type of the media source.
-     */
-    media: string;
-    /** @deprecated */
-    msKeySystem: string;
-    sizes: string;
-    /**
-     * The address or URL of the a media resource that is to be considered.
-     */
-    src: string;
-    srcset: string;
-    /**
-     * Gets or sets the MIME type of a media resource.
-     */
-    type: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSourceElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSourceElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLSourceElement: {
-    prototype: HTMLSourceElement;
-    new(): HTMLSourceElement;
-};
-
-interface HTMLSpanElement extends HTMLElement {
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSpanElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSpanElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLSpanElement: {
-    prototype: HTMLSpanElement;
-    new(): HTMLSpanElement;
-};
-
-interface HTMLStyleElement extends HTMLElement, LinkStyle {
-    /** @deprecated */
-    disabled: boolean;
-    /**
-     * Sets or retrieves the media type.
-     */
-    media: string;
-    /**
-     * Retrieves the CSS language in which the style sheet is written.
-     */
-    type: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLStyleElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLStyleElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLStyleElement: {
-    prototype: HTMLStyleElement;
-    new(): HTMLStyleElement;
-};
-
-interface HTMLSummaryElement extends HTMLElement {
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSummaryElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSummaryElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLSummaryElement: {
-    prototype: HTMLSummaryElement;
-    new(): HTMLSummaryElement;
-};
-
-interface HTMLTableCaptionElement extends HTMLElement {
-    /**
-     * Sets or retrieves the alignment of the caption or legend.
-     */
-    /** @deprecated */
-    align: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableCaptionElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableCaptionElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTableCaptionElement: {
-    prototype: HTMLTableCaptionElement;
-    new(): HTMLTableCaptionElement;
-};
-
-interface HTMLTableCellElement extends HTMLElement {
-    /**
-     * Sets or retrieves abbreviated text for the object.
-     */
-    abbr: string;
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    /** @deprecated */
-    align: string;
-    /**
-     * Sets or retrieves a comma-delimited list of conceptual categories associated with the object.
-     */
-    /** @deprecated */
-    axis: string;
-    /** @deprecated */
-    bgColor: string;
-    /**
-     * Retrieves the position of the object in the cells collection of a row.
-     */
-    readonly cellIndex: number;
-    /** @deprecated */
-    ch: string;
-    /** @deprecated */
-    chOff: string;
-    /**
-     * Sets or retrieves the number columns in the table that the object should span.
-     */
-    colSpan: number;
-    /**
-     * Sets or retrieves a list of header cells that provide information for the object.
-     */
-    headers: string;
-    /**
-     * Sets or retrieves the height of the object.
-     */
-    /** @deprecated */
-    height: string;
-    /**
-     * Sets or retrieves whether the browser automatically performs wordwrap.
-     */
-    /** @deprecated */
-    noWrap: boolean;
-    /**
-     * Sets or retrieves how many rows in a table the cell should span.
-     */
-    rowSpan: number;
-    /**
-     * Sets or retrieves the group of cells in a table to which the object's information applies.
-     */
-    scope: string;
-    /** @deprecated */
-    vAlign: string;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    /** @deprecated */
-    width: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableCellElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableCellElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTableCellElement: {
-    prototype: HTMLTableCellElement;
-    new(): HTMLTableCellElement;
-};
-
-interface HTMLTableColElement extends HTMLElement {
-    /**
-     * Sets or retrieves the alignment of the object relative to the display or table.
-     */
-    /** @deprecated */
-    align: string;
-    /** @deprecated */
-    ch: string;
-    /** @deprecated */
-    chOff: string;
-    /**
-     * Sets or retrieves the number of columns in the group.
-     */
-    span: number;
-    /** @deprecated */
-    vAlign: string;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    /** @deprecated */
-    width: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableColElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableColElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTableColElement: {
-    prototype: HTMLTableColElement;
-    new(): HTMLTableColElement;
-};
-
-interface HTMLTableDataCellElement extends HTMLTableCellElement {
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableDataCellElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableDataCellElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTableDataCellElement: {
-    prototype: HTMLTableDataCellElement;
-    new(): HTMLTableDataCellElement;
-};
-
-interface HTMLTableElement extends HTMLElement {
-    /**
-     * Sets or retrieves a value that indicates the table alignment.
-     */
-    /** @deprecated */
-    align: string;
-    /** @deprecated */
-    bgColor: string;
-    /**
-     * Sets or retrieves the width of the border to draw around the object.
-     */
-    /** @deprecated */
-    border: string;
-    /**
-     * Retrieves the caption object of a table.
-     */
-    caption: HTMLTableCaptionElement | null;
-    /**
-     * Sets or retrieves the amount of space between the border of the cell and the content of the cell.
-     */
-    /** @deprecated */
-    cellPadding: string;
-    /**
-     * Sets or retrieves the amount of space between cells in a table.
-     */
-    /** @deprecated */
-    cellSpacing: string;
-    /**
-     * Sets or retrieves the way the border frame around the table is displayed.
-     */
-    /** @deprecated */
-    frame: string;
-    /**
-     * Sets or retrieves the number of horizontal rows contained in the object.
-     */
-    readonly rows: HTMLCollectionOf<HTMLTableRowElement>;
-    /**
-     * Sets or retrieves which dividing lines (inner borders) are displayed.
-     */
-    /** @deprecated */
-    rules: string;
-    /**
-     * Sets or retrieves a description and/or structure of the object.
-     */
-    /** @deprecated */
-    summary: string;
-    /**
-     * Retrieves a collection of all tBody objects in the table. Objects in this collection are in source order.
-     */
-    readonly tBodies: HTMLCollectionOf<HTMLTableSectionElement>;
-    /**
-     * Retrieves the tFoot object of the table.
-     */
-    tFoot: HTMLTableSectionElement | null;
-    /**
-     * Retrieves the tHead object of the table.
-     */
-    tHead: HTMLTableSectionElement | null;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    /** @deprecated */
-    width: string;
-    /**
-     * Creates an empty caption element in the table.
-     */
-    createCaption(): HTMLTableCaptionElement;
-    /**
-     * Creates an empty tBody element in the table.
-     */
-    createTBody(): HTMLTableSectionElement;
-    /**
-     * Creates an empty tFoot element in the table.
-     */
-    createTFoot(): HTMLTableSectionElement;
-    /**
-     * Returns the tHead element object if successful, or null otherwise.
-     */
-    createTHead(): HTMLTableSectionElement;
-    /**
-     * Deletes the caption element and its contents from the table.
-     */
-    deleteCaption(): void;
-    /**
-     * Removes the specified row (tr) from the element and from the rows collection.
-     * @param index Number that specifies the zero-based position in the rows collection of the row to remove.
-     */
-    deleteRow(index?: number): void;
-    /**
-     * Deletes the tFoot element and its contents from the table.
-     */
-    deleteTFoot(): void;
-    /**
-     * Deletes the tHead element and its contents from the table.
-     */
-    deleteTHead(): void;
-    /**
-     * Creates a new row (tr) in the table, and adds the row to the rows collection.
-     * @param index Number that specifies where to insert the row in the rows collection. The default value is -1, which appends the new row to the end of the rows collection.
-     */
-    insertRow(index?: number): HTMLTableRowElement;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTableElement: {
-    prototype: HTMLTableElement;
-    new(): HTMLTableElement;
-};
-
-interface HTMLTableHeaderCellElement extends HTMLTableCellElement {
-    scope: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableHeaderCellElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableHeaderCellElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTableHeaderCellElement: {
-    prototype: HTMLTableHeaderCellElement;
-    new(): HTMLTableHeaderCellElement;
-};
-
-interface HTMLTableRowElement extends HTMLElement {
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    /** @deprecated */
-    align: string;
-    /** @deprecated */
-    bgColor: string;
-    /**
-     * Retrieves a collection of all cells in the table row.
-     */
-    readonly cells: HTMLCollectionOf<HTMLTableDataCellElement | HTMLTableHeaderCellElement>;
-    /** @deprecated */
-    ch: string;
-    /** @deprecated */
-    chOff: string;
-    /**
-     * Retrieves the position of the object in the rows collection for the table.
-     */
-    readonly rowIndex: number;
-    /**
-     * Retrieves the position of the object in the collection.
-     */
-    readonly sectionRowIndex: number;
-    /** @deprecated */
-    vAlign: string;
-    /**
-     * Removes the specified cell from the table row, as well as from the cells collection.
-     * @param index Number that specifies the zero-based position of the cell to remove from the table row. If no value is provided, the last cell in the cells collection is deleted.
-     */
-    deleteCell(index?: number): void;
-    /**
-     * Creates a new cell in the table row, and adds the cell to the cells collection.
-     * @param index Number that specifies where to insert the cell in the tr. The default value is -1, which appends the new cell to the end of the cells collection.
-     */
-    insertCell(index?: number): HTMLTableDataCellElement;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableRowElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableRowElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTableRowElement: {
-    prototype: HTMLTableRowElement;
-    new(): HTMLTableRowElement;
-};
-
-interface HTMLTableSectionElement extends HTMLElement {
-    /**
-     * Sets or retrieves a value that indicates the table alignment.
-     */
-    /** @deprecated */
-    align: string;
-    /** @deprecated */
-    ch: string;
-    /** @deprecated */
-    chOff: string;
-    /**
-     * Sets or retrieves the number of horizontal rows contained in the object.
-     */
-    readonly rows: HTMLCollectionOf<HTMLTableRowElement>;
-    /** @deprecated */
-    vAlign: string;
-    /**
-     * Removes the specified row (tr) from the element and from the rows collection.
-     * @param index Number that specifies the zero-based position in the rows collection of the row to remove.
-     */
-    deleteRow(index?: number): void;
-    /**
-     * Creates a new row (tr) in the table, and adds the row to the rows collection.
-     * @param index Number that specifies where to insert the row in the rows collection. The default value is -1, which appends the new row to the end of the rows collection.
-     */
-    insertRow(index?: number): HTMLTableRowElement;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableSectionElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableSectionElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTableSectionElement: {
-    prototype: HTMLTableSectionElement;
-    new(): HTMLTableSectionElement;
-};
-
-interface HTMLTemplateElement extends HTMLElement {
-    readonly content: DocumentFragment;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTemplateElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTemplateElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTemplateElement: {
-    prototype: HTMLTemplateElement;
-    new(): HTMLTemplateElement;
-};
-
-interface HTMLTextAreaElement extends HTMLElement {
-    /**
-     * Provides a way to direct a user to a specific field when a document loads. This can provide both direction and convenience for a user, reducing the need to click or tab to a field when a page opens. This attribute is true when present on an element, and false when missing.
-     */
-    autofocus: boolean;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    cols: number;
-    /**
-     * Sets or retrieves the initial contents of the object.
-     */
-    defaultValue: string;
-    disabled: boolean;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Sets or retrieves the maximum number of characters that the user can enter in a text control.
-     */
-    maxLength: number;
-    minLength: number;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    name: string;
-    /**
-     * Gets or sets a text string that is displayed in an input field as a hint or prompt to users as the format or type of information they need to enter.The text appears in an input field until the user puts focus on the field.
-     */
-    placeholder: string;
-    /**
-     * Sets or retrieves the value indicated whether the content of the object is read-only.
-     */
-    readOnly: boolean;
-    /**
-     * When present, marks an element that can't be submitted without a value.
-     */
-    required: boolean;
-    /**
-     * Sets or retrieves the number of horizontal rows contained in the object.
-     */
-    rows: number;
-    /**
-     * Gets or sets the end position or offset of a text selection.
-     */
-    selectionEnd: number;
-    /**
-     * Gets or sets the starting position or offset of a text selection.
-     */
-    selectionStart: number;
-    /**
-     * Retrieves the type of control.
-     */
-    readonly type: string;
-    /**
-     * Returns the error message that would be displayed if the user submits the form, or an empty string if no error message. It also triggers the standard error message, such as "this is a required field". The result is that the user sees validation messages without actually submitting.
-     */
-    readonly validationMessage: string;
-    /**
-     * Returns a  ValidityState object that represents the validity states of an element.
-     */
-    readonly validity: ValidityState;
-    /**
-     * Retrieves or sets the text in the entry field of the textArea element.
-     */
-    value: string;
-    /**
-     * Returns whether an element will successfully validate based on forms validation rules and constraints.
-     */
-    readonly willValidate: boolean;
-    /**
-     * Sets or retrieves how to handle wordwrapping in the object.
-     */
-    wrap: string;
-    /**
-     * Returns whether a form will validate when it is submitted, without having to submit it.
-     */
-    checkValidity(): boolean;
-    /**
-     * Highlights the input area of a form element.
-     */
-    select(): void;
-    /**
-     * Sets a custom error message that is displayed when a form is submitted.
-     * @param error Sets a custom error message that is displayed when a form is submitted.
-     */
-    setCustomValidity(error: string): void;
-    /**
-     * Sets the start and end positions of a selection in a text field.
-     * @param start The offset into the text field for the start of the selection.
-     * @param end The offset into the text field for the end of the selection.
-     * @param direction The direction in which the selection is performed.
-     */
-    setSelectionRange(start: number, end: number, direction?: "forward" | "backward" | "none"): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTextAreaElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTextAreaElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTextAreaElement: {
-    prototype: HTMLTextAreaElement;
-    new(): HTMLTextAreaElement;
-};
-
-interface HTMLTimeElement extends HTMLElement {
-    dateTime: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTimeElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTimeElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTimeElement: {
-    prototype: HTMLTimeElement;
-    new(): HTMLTimeElement;
-};
-
-interface HTMLTitleElement extends HTMLElement {
-    /**
-     * Retrieves or sets the text of the object as a string.
-     */
-    text: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTitleElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTitleElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTitleElement: {
-    prototype: HTMLTitleElement;
-    new(): HTMLTitleElement;
-};
-
-interface HTMLTrackElement extends HTMLElement {
-    default: boolean;
-    kind: string;
-    label: string;
-    readonly readyState: number;
-    src: string;
-    srclang: string;
-    readonly track: TextTrack;
-    readonly ERROR: number;
-    readonly LOADED: number;
-    readonly LOADING: number;
-    readonly NONE: number;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTrackElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTrackElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTrackElement: {
-    prototype: HTMLTrackElement;
-    new(): HTMLTrackElement;
-    readonly ERROR: number;
-    readonly LOADED: number;
-    readonly LOADING: number;
-    readonly NONE: number;
-};
-
-interface HTMLUListElement extends HTMLElement {
-    /** @deprecated */
-    compact: boolean;
-    /** @deprecated */
-    type: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLUListElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLUListElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLUListElement: {
-    prototype: HTMLUListElement;
-    new(): HTMLUListElement;
-};
-
-interface HTMLUnknownElement extends HTMLElement {
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLUnknownElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLUnknownElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLUnknownElement: {
-    prototype: HTMLUnknownElement;
-    new(): HTMLUnknownElement;
-};
-
-interface HTMLVideoElementEventMap extends HTMLMediaElementEventMap {
-    "MSVideoFormatChanged": Event;
-    "MSVideoFrameStepCompleted": Event;
-    "MSVideoOptimalLayoutChanged": Event;
-}
-
-interface HTMLVideoElement extends HTMLMediaElement {
-    /**
-     * Gets or sets the height of the video element.
-     */
-    height: number;
-    msHorizontalMirror: boolean;
-    readonly msIsLayoutOptimalForPlayback: boolean;
-    readonly msIsStereo3D: boolean;
-    msStereo3DPackingMode: string;
-    msStereo3DRenderMode: string;
-    msZoom: boolean;
-    onMSVideoFormatChanged: ((this: HTMLVideoElement, ev: Event) => any) | null;
-    onMSVideoFrameStepCompleted: ((this: HTMLVideoElement, ev: Event) => any) | null;
-    onMSVideoOptimalLayoutChanged: ((this: HTMLVideoElement, ev: Event) => any) | null;
-    /**
-     * Gets or sets a URL of an image to display, for example, like a movie poster. This can be a still frame from the video, or another image if no video data is available.
-     */
-    poster: string;
-    /**
-     * Gets the intrinsic height of a video in CSS pixels, or zero if the dimensions are not known.
-     */
-    readonly videoHeight: number;
-    /**
-     * Gets the intrinsic width of a video in CSS pixels, or zero if the dimensions are not known.
-     */
-    readonly videoWidth: number;
-    readonly webkitDisplayingFullscreen: boolean;
-    readonly webkitSupportsFullscreen: boolean;
-    /**
-     * Gets or sets the width of the video element.
-     */
-    width: number;
-    getVideoPlaybackQuality(): VideoPlaybackQuality;
-    msFrameStep(forward: boolean): void;
-    msInsertVideoEffect(activatableClassId: string, effectRequired: boolean, config?: any): void;
-    msSetVideoRectangle(left: number, top: number, right: number, bottom: number): void;
-    webkitEnterFullScreen(): void;
-    webkitEnterFullscreen(): void;
-    webkitExitFullScreen(): void;
-    webkitExitFullscreen(): void;
-    addEventListener<K extends keyof HTMLVideoElementEventMap>(type: K, listener: (this: HTMLVideoElement, ev: HTMLVideoElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLVideoElementEventMap>(type: K, listener: (this: HTMLVideoElement, ev: HTMLVideoElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLVideoElement: {
-    prototype: HTMLVideoElement;
-    new(): HTMLVideoElement;
-};
-
-interface HTMLegendElement {
-    readonly form: HTMLFormElement | null;
-}
-
-declare var HTMLegendElement: {
-    prototype: HTMLegendElement;
-    new(): HTMLegendElement;
-};
-
-interface HashChangeEvent extends Event {
-    readonly newURL: string;
-    readonly oldURL: string;
-}
-
-declare var HashChangeEvent: {
-    prototype: HashChangeEvent;
-    new(type: string, eventInitDict?: HashChangeEventInit): HashChangeEvent;
-};
-
-interface Headers {
-    append(name: string, value: string): void;
-    delete(name: string): void;
-    forEach(callback: Function, thisArg?: any): void;
-    get(name: string): string | null;
-    has(name: string): boolean;
-    set(name: string, value: string): void;
-}
-
-declare var Headers: {
-    prototype: Headers;
-    new(init?: HeadersInit): Headers;
-};
-
-interface History {
-    readonly length: number;
-    scrollRestoration: ScrollRestoration;
-    readonly state: any;
-    back(distance?: any): void;
-    forward(distance?: any): void;
-    go(delta?: any): void;
-    pushState(data: any, title?: string, url?: string | null): void;
-    replaceState(data: any, title?: string, url?: string | null): void;
-}
-
-declare var History: {
-    prototype: History;
-    new(): History;
-};
-
-interface HkdfCtrParams extends Algorithm {
-    context: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer;
-    hash: string | Algorithm;
-    label: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer;
-}
-
-interface IDBArrayKey extends Array<number | string | Date | IDBArrayKey> {
-}
-
-interface IDBCursor {
-    readonly direction: IDBCursorDirection;
-    readonly key: IDBKeyRange | number | string | Date | IDBArrayKey;
-    readonly primaryKey: any;
-    readonly source: IDBObjectStore | IDBIndex;
-    advance(count: number): void;
-    continue(key?: IDBKeyRange | number | string | Date | IDBArrayKey): void;
-    delete(): IDBRequest;
-    update(value: any): IDBRequest;
-    readonly NEXT: string;
-    readonly NEXT_NO_DUPLICATE: string;
-    readonly PREV: string;
-    readonly PREV_NO_DUPLICATE: string;
-}
-
-declare var IDBCursor: {
-    prototype: IDBCursor;
-    new(): IDBCursor;
-    readonly NEXT: string;
-    readonly NEXT_NO_DUPLICATE: string;
-    readonly PREV: string;
-    readonly PREV_NO_DUPLICATE: string;
-};
-
-interface IDBCursorWithValue extends IDBCursor {
-    readonly value: any;
-}
-
-declare var IDBCursorWithValue: {
-    prototype: IDBCursorWithValue;
-    new(): IDBCursorWithValue;
-};
-
-interface IDBDatabaseEventMap {
-    "abort": Event;
-    "error": Event;
-}
-
-interface IDBDatabase extends EventTarget {
-    readonly name: string;
-    readonly objectStoreNames: DOMStringList;
-    onabort: ((this: IDBDatabase, ev: Event) => any) | null;
-    onerror: ((this: IDBDatabase, ev: Event) => any) | null;
-    onversionchange: ((this: IDBDatabase, ev: Event) => any) | null;
-    readonly version: number;
-    close(): void;
-    createObjectStore(name: string, optionalParameters?: IDBObjectStoreParameters): IDBObjectStore;
-    deleteObjectStore(name: string): void;
-    transaction(storeNames: string | string[], mode?: IDBTransactionMode): IDBTransaction;
-    addEventListener<K extends keyof IDBDatabaseEventMap>(type: K, listener: (this: IDBDatabase, ev: IDBDatabaseEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof IDBDatabaseEventMap>(type: K, listener: (this: IDBDatabase, ev: IDBDatabaseEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var IDBDatabase: {
-    prototype: IDBDatabase;
-    new(): IDBDatabase;
-};
-
-interface IDBEnvironment {
-    readonly indexedDB: IDBFactory;
-}
-
-interface IDBFactory {
-    cmp(first: any, second: any): number;
-    deleteDatabase(name: string): IDBOpenDBRequest;
-    open(name: string, version?: number): IDBOpenDBRequest;
-}
-
-declare var IDBFactory: {
-    prototype: IDBFactory;
-    new(): IDBFactory;
-};
-
-interface IDBIndex {
-    readonly keyPath: string | string[];
-    multiEntry: boolean;
-    readonly name: string;
-    readonly objectStore: IDBObjectStore;
-    readonly unique: boolean;
-    count(key?: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-    get(key: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-    getKey(key: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-    openCursor(range?: IDBKeyRange | number | string | Date | IDBArrayKey, direction?: IDBCursorDirection): IDBRequest;
-    openKeyCursor(range?: IDBKeyRange | number | string | Date | IDBArrayKey, direction?: IDBCursorDirection): IDBRequest;
-}
-
-declare var IDBIndex: {
-    prototype: IDBIndex;
-    new(): IDBIndex;
-};
-
-interface IDBKeyRange {
-    readonly lower: any;
-    readonly lowerOpen: boolean;
-    readonly upper: any;
-    readonly upperOpen: boolean;
-}
-
-declare var IDBKeyRange: {
-    prototype: IDBKeyRange;
-    new(): IDBKeyRange;
-    bound(lower: any, upper: any, lowerOpen?: boolean, upperOpen?: boolean): IDBKeyRange;
-    lowerBound(lower: any, open?: boolean): IDBKeyRange;
-    only(value: any): IDBKeyRange;
-    upperBound(upper: any, open?: boolean): IDBKeyRange;
-};
-
-interface IDBObjectStore {
-    autoIncrement: boolean;
-    readonly indexNames: DOMStringList;
-    readonly keyPath: string | string[] | null;
-    readonly name: string;
-    readonly transaction: IDBTransaction;
-    add(value: any, key?: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-    clear(): IDBRequest;
-    count(key?: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-    createIndex(name: string, keyPath: string | string[], optionalParameters?: IDBIndexParameters): IDBIndex;
-    delete(key: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-    deleteIndex(indexName: string): void;
-    get(key: any): IDBRequest;
-    index(name: string): IDBIndex;
-    openCursor(range?: IDBKeyRange | number | string | Date | IDBArrayKey, direction?: IDBCursorDirection): IDBRequest;
-    put(value: any, key?: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-}
-
-declare var IDBObjectStore: {
-    prototype: IDBObjectStore;
-    new(): IDBObjectStore;
-};
-
-interface IDBOpenDBRequestEventMap extends IDBRequestEventMap {
-    "blocked": Event;
-    "upgradeneeded": IDBVersionChangeEvent;
-}
-
-interface IDBOpenDBRequest extends IDBRequest {
-    onblocked: ((this: IDBOpenDBRequest, ev: Event) => any) | null;
-    onupgradeneeded: ((this: IDBOpenDBRequest, ev: IDBVersionChangeEvent) => any) | null;
-    addEventListener<K extends keyof IDBOpenDBRequestEventMap>(type: K, listener: (this: IDBOpenDBRequest, ev: IDBOpenDBRequestEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof IDBOpenDBRequestEventMap>(type: K, listener: (this: IDBOpenDBRequest, ev: IDBOpenDBRequestEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var IDBOpenDBRequest: {
-    prototype: IDBOpenDBRequest;
-    new(): IDBOpenDBRequest;
-};
-
-interface IDBRequestEventMap {
-    "error": Event;
-    "success": Event;
-}
-
-interface IDBRequest extends EventTarget {
-    readonly error: DOMException;
-    onerror: ((this: IDBRequest, ev: Event) => any) | null;
-    onsuccess: ((this: IDBRequest, ev: Event) => any) | null;
-    readonly readyState: IDBRequestReadyState;
-    readonly result: any;
-    readonly source: IDBObjectStore | IDBIndex | IDBCursor;
-    readonly transaction: IDBTransaction;
-    addEventListener<K extends keyof IDBRequestEventMap>(type: K, listener: (this: IDBRequest, ev: IDBRequestEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof IDBRequestEventMap>(type: K, listener: (this: IDBRequest, ev: IDBRequestEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var IDBRequest: {
-    prototype: IDBRequest;
-    new(): IDBRequest;
-};
-
-interface IDBTransactionEventMap {
-    "abort": Event;
-    "complete": Event;
-    "error": Event;
-}
-
-interface IDBTransaction extends EventTarget {
-    readonly db: IDBDatabase;
-    readonly error: DOMException;
-    readonly mode: IDBTransactionMode;
-    onabort: ((this: IDBTransaction, ev: Event) => any) | null;
-    oncomplete: ((this: IDBTransaction, ev: Event) => any) | null;
-    onerror: ((this: IDBTransaction, ev: Event) => any) | null;
-    abort(): void;
-    objectStore(name: string): IDBObjectStore;
-    readonly READ_ONLY: string;
-    readonly READ_WRITE: string;
-    readonly VERSION_CHANGE: string;
-    addEventListener<K extends keyof IDBTransactionEventMap>(type: K, listener: (this: IDBTransaction, ev: IDBTransactionEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof IDBTransactionEventMap>(type: K, listener: (this: IDBTransaction, ev: IDBTransactionEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var IDBTransaction: {
-    prototype: IDBTransaction;
-    new(): IDBTransaction;
-    readonly READ_ONLY: string;
-    readonly READ_WRITE: string;
-    readonly VERSION_CHANGE: string;
-};
-
-interface IDBVersionChangeEvent extends Event {
-    readonly newVersion: number | null;
-    readonly oldVersion: number;
-}
-
-declare var IDBVersionChangeEvent: {
-    prototype: IDBVersionChangeEvent;
-    new(): IDBVersionChangeEvent;
-};
-
-interface IIRFilterNode extends AudioNode {
-    getFrequencyResponse(frequencyHz: Float32Array, magResponse: Float32Array, phaseResponse: Float32Array): void;
-}
-
-declare var IIRFilterNode: {
-    prototype: IIRFilterNode;
-    new(): IIRFilterNode;
-};
-
-interface ImageBitmap {
-    readonly height: number;
-    readonly width: number;
-    close(): void;
-}
-
-interface ImageBitmapOptions {
-    colorSpaceConversion?: "none" | "default";
-    imageOrientation?: "none" | "flipY";
-    premultiplyAlpha?: "none" | "premultiply" | "default";
-    resizeHeight?: number;
-    resizeQuality?: "pixelated" | "low" | "medium" | "high";
-    resizeWidth?: number;
-}
-
-interface ImageData {
-    readonly data: Uint8ClampedArray;
-    readonly height: number;
-    readonly width: number;
-}
-
-declare var ImageData: {
-    prototype: ImageData;
-    new(width: number, height: number): ImageData;
-    new(array: Uint8ClampedArray, width: number, height: number): ImageData;
-};
-
-interface IntersectionObserver {
-    readonly root: Element | null;
-    readonly rootMargin: string;
-    readonly thresholds: number[];
-    disconnect(): void;
-    observe(target: Element): void;
-    takeRecords(): IntersectionObserverEntry[];
-    unobserve(target: Element): void;
-}
-
-declare var IntersectionObserver: {
-    prototype: IntersectionObserver;
-    new(callback: IntersectionObserverCallback, options?: IntersectionObserverInit): IntersectionObserver;
-};
-
-interface IntersectionObserverEntry {
-    readonly boundingClientRect: ClientRect | DOMRect;
-    readonly intersectionRatio: number;
-    readonly intersectionRect: ClientRect | DOMRect;
-    readonly isIntersecting: boolean;
-    readonly rootBounds: ClientRect | DOMRect;
-    readonly target: Element;
-    readonly time: number;
-}
-
-declare var IntersectionObserverEntry: {
-    prototype: IntersectionObserverEntry;
-    new(intersectionObserverEntryInit: IntersectionObserverEntryInit): IntersectionObserverEntry;
-};
-
-interface KeyboardEvent extends UIEvent {
-    readonly altKey: boolean;
-    /** @deprecated */
-    char: string;
-    /** @deprecated */
-    readonly charCode: number;
-    readonly code: string;
-    readonly ctrlKey: boolean;
-    readonly key: string;
-    /** @deprecated */
-    readonly keyCode: number;
-    readonly location: number;
-    readonly metaKey: boolean;
-    readonly repeat: boolean;
-    readonly shiftKey: boolean;
-    /** @deprecated */
-    readonly which: number;
-    getModifierState(keyArg: string): boolean;
-    /** @deprecated */
-    initKeyboardEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, keyArg: string, locationArg: number, modifiersListArg: string, repeat: boolean, locale: string): void;
-    readonly DOM_KEY_LOCATION_JOYSTICK: number;
-    readonly DOM_KEY_LOCATION_LEFT: number;
-    readonly DOM_KEY_LOCATION_MOBILE: number;
-    readonly DOM_KEY_LOCATION_NUMPAD: number;
-    readonly DOM_KEY_LOCATION_RIGHT: number;
-    readonly DOM_KEY_LOCATION_STANDARD: number;
-}
-
-declare var KeyboardEvent: {
-    prototype: KeyboardEvent;
-    new(typeArg: string, eventInitDict?: KeyboardEventInit): KeyboardEvent;
-    readonly DOM_KEY_LOCATION_JOYSTICK: number;
-    readonly DOM_KEY_LOCATION_LEFT: number;
-    readonly DOM_KEY_LOCATION_MOBILE: number;
-    readonly DOM_KEY_LOCATION_NUMPAD: number;
-    readonly DOM_KEY_LOCATION_RIGHT: number;
-    readonly DOM_KEY_LOCATION_STANDARD: number;
-};
-
-interface LinkStyle {
-    readonly sheet: StyleSheet | null;
-}
-
-interface ListeningStateChangedEvent extends Event {
-    readonly label: string;
-    readonly state: ListeningState;
-}
-
-declare var ListeningStateChangedEvent: {
-    prototype: ListeningStateChangedEvent;
-    new(): ListeningStateChangedEvent;
-};
-
-interface Location {
-    hash: string;
-    host: string;
-    hostname: string;
-    href: string;
-    readonly origin: string;
-    pathname: string;
-    port: string;
-    protocol: string;
-    search: string;
-    assign(url: string): void;
-    reload(forcedReload?: boolean): void;
-    replace(url: string): void;
-    toString(): string;
-}
-
-declare var Location: {
-    prototype: Location;
-    new(): Location;
-};
-
-interface MSAssertion {
-    readonly id: string;
-    readonly type: MSCredentialType;
-}
-
-declare var MSAssertion: {
-    prototype: MSAssertion;
-    new(): MSAssertion;
-};
-
-interface MSBlobBuilder {
-    append(data: any, endings?: string): void;
-    getBlob(contentType?: string): Blob;
-}
-
-declare var MSBlobBuilder: {
-    prototype: MSBlobBuilder;
-    new(): MSBlobBuilder;
-};
-
-interface MSCredentials {
-    getAssertion(challenge: string, filter?: MSCredentialFilter, params?: MSSignatureParameters): Promise<MSAssertion>;
-    makeCredential(accountInfo: MSAccountInfo, params: MSCredentialParameters[], challenge?: string): Promise<MSAssertion>;
-}
-
-declare var MSCredentials: {
-    prototype: MSCredentials;
-    new(): MSCredentials;
-};
-
-interface MSDCCEvent extends Event {
-    readonly maxFr: number;
-    readonly maxFs: number;
-}
-
-declare var MSDCCEvent: {
-    prototype: MSDCCEvent;
-    new(type: string, eventInitDict: MSDCCEventInit): MSDCCEvent;
-};
-
-interface MSDSHEvent extends Event {
-    readonly sources: number[];
-    readonly timestamp: number;
-}
-
-declare var MSDSHEvent: {
-    prototype: MSDSHEvent;
-    new(type: string, eventInitDict: MSDSHEventInit): MSDSHEvent;
-};
-
-interface MSFIDOCredentialAssertion extends MSAssertion {
-    readonly algorithm: string | Algorithm;
-    readonly attestation: any;
-    readonly publicKey: string;
-    readonly transportHints: MSTransportType[];
-}
-
-declare var MSFIDOCredentialAssertion: {
-    prototype: MSFIDOCredentialAssertion;
-    new(): MSFIDOCredentialAssertion;
-};
-
-interface MSFIDOSignature {
-    readonly authnrData: string;
-    readonly clientData: string;
-    readonly signature: string;
-}
-
-declare var MSFIDOSignature: {
-    prototype: MSFIDOSignature;
-    new(): MSFIDOSignature;
-};
-
-interface MSFIDOSignatureAssertion extends MSAssertion {
-    readonly signature: MSFIDOSignature;
-}
-
-declare var MSFIDOSignatureAssertion: {
-    prototype: MSFIDOSignatureAssertion;
-    new(): MSFIDOSignatureAssertion;
-};
-
-interface MSFileSaver {
-    msSaveBlob(blob: any, defaultName?: string): boolean;
-    msSaveOrOpenBlob(blob: any, defaultName?: string): boolean;
-}
-
-interface MSGesture {
-    target: Element;
-    addPointer(pointerId: number): void;
-    stop(): void;
-}
-
-declare var MSGesture: {
-    prototype: MSGesture;
-    new(): MSGesture;
-};
-
-interface MSGestureEvent extends UIEvent {
-    readonly clientX: number;
-    readonly clientY: number;
-    readonly expansion: number;
-    readonly gestureObject: any;
-    readonly hwTimestamp: number;
-    readonly offsetX: number;
-    readonly offsetY: number;
-    readonly rotation: number;
-    readonly scale: number;
-    readonly screenX: number;
-    readonly screenY: number;
-    readonly translationX: number;
-    readonly translationY: number;
-    readonly velocityAngular: number;
-    readonly velocityExpansion: number;
-    readonly velocityX: number;
-    readonly velocityY: number;
-    initGestureEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number, screenXArg: number, screenYArg: number, clientXArg: number, clientYArg: number, offsetXArg: number, offsetYArg: number, translationXArg: number, translationYArg: number, scaleArg: number, expansionArg: number, rotationArg: number, velocityXArg: number, velocityYArg: number, velocityExpansionArg: number, velocityAngularArg: number, hwTimestampArg: number): void;
-    readonly MSGESTURE_FLAG_BEGIN: number;
-    readonly MSGESTURE_FLAG_CANCEL: number;
-    readonly MSGESTURE_FLAG_END: number;
-    readonly MSGESTURE_FLAG_INERTIA: number;
-    readonly MSGESTURE_FLAG_NONE: number;
-}
-
-declare var MSGestureEvent: {
-    prototype: MSGestureEvent;
-    new(): MSGestureEvent;
-    readonly MSGESTURE_FLAG_BEGIN: number;
-    readonly MSGESTURE_FLAG_CANCEL: number;
-    readonly MSGESTURE_FLAG_END: number;
-    readonly MSGESTURE_FLAG_INERTIA: number;
-    readonly MSGESTURE_FLAG_NONE: number;
-};
-
-interface MSGraphicsTrust {
-    readonly constrictionActive: boolean;
-    readonly status: string;
-}
-
-declare var MSGraphicsTrust: {
-    prototype: MSGraphicsTrust;
-    new(): MSGraphicsTrust;
-};
-
-interface MSInputMethodContextEventMap {
-    "MSCandidateWindowHide": Event;
-    "MSCandidateWindowShow": Event;
-    "MSCandidateWindowUpdate": Event;
-}
-
-interface MSInputMethodContext extends EventTarget {
-    readonly compositionEndOffset: number;
-    readonly compositionStartOffset: number;
-    oncandidatewindowhide: ((this: MSInputMethodContext, ev: Event) => any) | null;
-    oncandidatewindowshow: ((this: MSInputMethodContext, ev: Event) => any) | null;
-    oncandidatewindowupdate: ((this: MSInputMethodContext, ev: Event) => any) | null;
-    readonly target: HTMLElement;
-    getCandidateWindowClientRect(): ClientRect;
-    getCompositionAlternatives(): string[];
-    hasComposition(): boolean;
-    isCandidateWindowVisible(): boolean;
-    addEventListener<K extends keyof MSInputMethodContextEventMap>(type: K, listener: (this: MSInputMethodContext, ev: MSInputMethodContextEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof MSInputMethodContextEventMap>(type: K, listener: (this: MSInputMethodContext, ev: MSInputMethodContextEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var MSInputMethodContext: {
-    prototype: MSInputMethodContext;
-    new(): MSInputMethodContext;
-};
-
-interface MSMediaKeyError {
-    readonly code: number;
-    readonly systemCode: number;
-    readonly MS_MEDIA_KEYERR_CLIENT: number;
-    readonly MS_MEDIA_KEYERR_DOMAIN: number;
-    readonly MS_MEDIA_KEYERR_HARDWARECHANGE: number;
-    readonly MS_MEDIA_KEYERR_OUTPUT: number;
-    readonly MS_MEDIA_KEYERR_SERVICE: number;
-    readonly MS_MEDIA_KEYERR_UNKNOWN: number;
-}
-
-declare var MSMediaKeyError: {
-    prototype: MSMediaKeyError;
-    new(): MSMediaKeyError;
-    readonly MS_MEDIA_KEYERR_CLIENT: number;
-    readonly MS_MEDIA_KEYERR_DOMAIN: number;
-    readonly MS_MEDIA_KEYERR_HARDWARECHANGE: number;
-    readonly MS_MEDIA_KEYERR_OUTPUT: number;
-    readonly MS_MEDIA_KEYERR_SERVICE: number;
-    readonly MS_MEDIA_KEYERR_UNKNOWN: number;
-};
-
-interface MSMediaKeyMessageEvent extends Event {
-    readonly destinationURL: string | null;
-    readonly message: Uint8Array;
-}
-
-declare var MSMediaKeyMessageEvent: {
-    prototype: MSMediaKeyMessageEvent;
-    new(): MSMediaKeyMessageEvent;
-};
-
-interface MSMediaKeyNeededEvent extends Event {
-    readonly initData: Uint8Array | null;
-}
-
-declare var MSMediaKeyNeededEvent: {
-    prototype: MSMediaKeyNeededEvent;
-    new(): MSMediaKeyNeededEvent;
-};
-
-interface MSMediaKeySession extends EventTarget {
-    readonly error: MSMediaKeyError | null;
-    readonly keySystem: string;
-    readonly sessionId: string;
-    close(): void;
-    update(key: Uint8Array): void;
-}
-
-declare var MSMediaKeySession: {
-    prototype: MSMediaKeySession;
-    new(): MSMediaKeySession;
-};
-
-interface MSMediaKeys {
-    readonly keySystem: string;
-    createSession(type: string, initData: Uint8Array, cdmData?: Uint8Array | null): MSMediaKeySession;
-}
-
-declare var MSMediaKeys: {
-    prototype: MSMediaKeys;
-    new(keySystem: string): MSMediaKeys;
-    isTypeSupported(keySystem: string, type?: string | null): boolean;
-    isTypeSupportedWithFeatures(keySystem: string, type?: string | null): string;
-};
-
-interface MSNavigatorDoNotTrack {
-    confirmSiteSpecificTrackingException(args: ConfirmSiteSpecificExceptionsInformation): boolean;
-    confirmWebWideTrackingException(args: ExceptionInformation): boolean;
-    removeSiteSpecificTrackingException(args: ExceptionInformation): void;
-    removeWebWideTrackingException(args: ExceptionInformation): void;
-    storeSiteSpecificTrackingException(args: StoreSiteSpecificExceptionsInformation): void;
-    storeWebWideTrackingException(args: StoreExceptionsInformation): void;
-}
-
-interface MSPointerEvent extends MouseEvent {
-    readonly currentPoint: any;
-    readonly height: number;
-    readonly hwTimestamp: number;
-    readonly intermediatePoints: any;
-    readonly isPrimary: boolean;
-    readonly pointerId: number;
-    readonly pointerType: any;
-    readonly pressure: number;
-    readonly rotation: number;
-    readonly tiltX: number;
-    readonly tiltY: number;
-    readonly width: number;
-    getCurrentPoint(element: Element): void;
-    getIntermediatePoints(element: Element): void;
-    initPointerEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number, screenXArg: number, screenYArg: number, clientXArg: number, clientYArg: number, ctrlKeyArg: boolean, altKeyArg: boolean, shiftKeyArg: boolean, metaKeyArg: boolean, buttonArg: number, relatedTargetArg: EventTarget, offsetXArg: number, offsetYArg: number, widthArg: number, heightArg: number, pressure: number, rotation: number, tiltX: number, tiltY: number, pointerIdArg: number, pointerType: any, hwTimestampArg: number, isPrimary: boolean): void;
-}
-
-declare var MSPointerEvent: {
-    prototype: MSPointerEvent;
-    new(typeArg: string, eventInitDict?: PointerEventInit): MSPointerEvent;
-};
-
-interface MSStream {
-    readonly type: string;
-    msClose(): void;
-    msDetachStream(): any;
-}
-
-declare var MSStream: {
-    prototype: MSStream;
-    new(): MSStream;
-};
-
-interface MSStreamReaderEventMap {
-    "abort": UIEvent;
-    "error": ErrorEvent;
-    "load": Event;
-    "loadend": ProgressEvent;
-    "loadstart": Event;
-    "progress": ProgressEvent;
-}
-
-interface MSStreamReader extends EventTarget {
-    readonly error: DOMError;
-    onabort: ((this: MSStreamReader, ev: UIEvent) => any) | null;
-    onerror: ((this: MSStreamReader, ev: ErrorEvent) => any) | null;
-    onload: ((this: MSStreamReader, ev: Event) => any) | null;
-    onloadend: ((this: MSStreamReader, ev: ProgressEvent) => any) | null;
-    onloadstart: ((this: MSStreamReader, ev: Event) => any) | null;
-    onprogress: ((this: MSStreamReader, ev: ProgressEvent) => any) | null;
-    readonly readyState: number;
-    readonly result: any;
-    abort(): void;
-    readAsArrayBuffer(stream: MSStream, size?: number): void;
-    readAsBinaryString(stream: MSStream, size?: number): void;
-    readAsBlob(stream: MSStream, size?: number): void;
-    readAsDataURL(stream: MSStream, size?: number): void;
-    readAsText(stream: MSStream, encoding?: string, size?: number): void;
-    readonly DONE: number;
-    readonly EMPTY: number;
-    readonly LOADING: number;
-    addEventListener<K extends keyof MSStreamReaderEventMap>(type: K, listener: (this: MSStreamReader, ev: MSStreamReaderEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof MSStreamReaderEventMap>(type: K, listener: (this: MSStreamReader, ev: MSStreamReaderEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var MSStreamReader: {
-    prototype: MSStreamReader;
-    new(): MSStreamReader;
-    readonly DONE: number;
-    readonly EMPTY: number;
-    readonly LOADING: number;
-};
-
-interface MediaDeviceInfo {
-    readonly deviceId: string;
-    readonly groupId: string;
-    readonly kind: MediaDeviceKind;
-    readonly label: string;
-}
-
-declare var MediaDeviceInfo: {
-    prototype: MediaDeviceInfo;
-    new(): MediaDeviceInfo;
-};
-
-interface MediaDevicesEventMap {
-    "devicechange": Event;
-}
-
-interface MediaDevices extends EventTarget {
-    ondevicechange: ((this: MediaDevices, ev: Event) => any) | null;
-    enumerateDevices(): Promise<MediaDeviceInfo[]>;
-    getSupportedConstraints(): MediaTrackSupportedConstraints;
-    getUserMedia(constraints: MediaStreamConstraints): Promise<MediaStream>;
-    addEventListener<K extends keyof MediaDevicesEventMap>(type: K, listener: (this: MediaDevices, ev: MediaDevicesEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof MediaDevicesEventMap>(type: K, listener: (this: MediaDevices, ev: MediaDevicesEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var MediaDevices: {
-    prototype: MediaDevices;
-    new(): MediaDevices;
-};
-
-interface MediaElementAudioSourceNode extends AudioNode {
-}
-
-declare var MediaElementAudioSourceNode: {
-    prototype: MediaElementAudioSourceNode;
-    new(): MediaElementAudioSourceNode;
-};
-
-interface MediaEncryptedEvent extends Event {
-    readonly initData: ArrayBuffer | null;
-    readonly initDataType: string;
-}
-
-declare var MediaEncryptedEvent: {
-    prototype: MediaEncryptedEvent;
-    new(type: string, eventInitDict?: MediaEncryptedEventInit): MediaEncryptedEvent;
-};
-
-interface MediaError {
-    readonly code: number;
-    readonly message: string;
-    readonly msExtendedCode: number;
-    readonly MEDIA_ERR_ABORTED: number;
-    readonly MEDIA_ERR_DECODE: number;
-    readonly MEDIA_ERR_NETWORK: number;
-    readonly MEDIA_ERR_SRC_NOT_SUPPORTED: number;
-    readonly MS_MEDIA_ERR_ENCRYPTED: number;
-}
-
-declare var MediaError: {
-    prototype: MediaError;
-    new(): MediaError;
-    readonly MEDIA_ERR_ABORTED: number;
-    readonly MEDIA_ERR_DECODE: number;
-    readonly MEDIA_ERR_NETWORK: number;
-    readonly MEDIA_ERR_SRC_NOT_SUPPORTED: number;
-    readonly MS_MEDIA_ERR_ENCRYPTED: number;
-};
-
-interface MediaKeyMessageEvent extends Event {
-    readonly message: ArrayBuffer;
-    readonly messageType: MediaKeyMessageType;
-}
-
-declare var MediaKeyMessageEvent: {
-    prototype: MediaKeyMessageEvent;
-    new(type: string, eventInitDict?: MediaKeyMessageEventInit): MediaKeyMessageEvent;
-};
-
-interface MediaKeySession extends EventTarget {
-    readonly closed: Promise<void>;
-    readonly expiration: number;
-    readonly keyStatuses: MediaKeyStatusMap;
-    readonly sessionId: string;
-    close(): Promise<void>;
-    generateRequest(initDataType: string, initData: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null): Promise<void>;
-    load(sessionId: string): Promise<boolean>;
-    remove(): Promise<void>;
-    update(response: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null): Promise<void>;
-}
-
-declare var MediaKeySession: {
-    prototype: MediaKeySession;
-    new(): MediaKeySession;
-};
-
-interface MediaKeyStatusMap {
-    readonly size: number;
-    forEach(callback: Function, thisArg?: any): void;
-    get(keyId: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null): MediaKeyStatus;
-    has(keyId: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null): boolean;
-}
-
-declare var MediaKeyStatusMap: {
-    prototype: MediaKeyStatusMap;
-    new(): MediaKeyStatusMap;
-};
-
-interface MediaKeySystemAccess {
-    readonly keySystem: string;
-    createMediaKeys(): Promise<MediaKeys>;
-    getConfiguration(): MediaKeySystemConfiguration;
-}
-
-declare var MediaKeySystemAccess: {
-    prototype: MediaKeySystemAccess;
-    new(): MediaKeySystemAccess;
-};
-
-interface MediaKeys {
-    createSession(sessionType?: MediaKeySessionType): MediaKeySession;
-    setServerCertificate(serverCertificate: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null): Promise<void>;
-}
-
-declare var MediaKeys: {
-    prototype: MediaKeys;
-    new(): MediaKeys;
-};
-
-interface MediaList {
-    readonly length: number;
-    mediaText: string;
-    appendMedium(medium: string): void;
-    deleteMedium(medium: string): void;
-    item(index: number): string | null;
-    toString(): number;
-    [index: number]: string;
-}
-
-declare var MediaList: {
-    prototype: MediaList;
-    new(): MediaList;
-};
-
-interface MediaQueryList {
-    readonly matches: boolean;
-    readonly media: string;
-    addListener(listener: MediaQueryListListener): void;
-    removeListener(listener: MediaQueryListListener): void;
-}
-
-declare var MediaQueryList: {
-    prototype: MediaQueryList;
-    new(): MediaQueryList;
-};
-
-interface MediaSource extends EventTarget {
-    readonly activeSourceBuffers: SourceBufferList;
-    duration: number;
-    readonly readyState: string;
-    readonly sourceBuffers: SourceBufferList;
-    addSourceBuffer(type: string): SourceBuffer;
-    endOfStream(error?: number): void;
-    removeSourceBuffer(sourceBuffer: SourceBuffer): void;
-}
-
-declare var MediaSource: {
-    prototype: MediaSource;
-    new(): MediaSource;
-    isTypeSupported(type: string): boolean;
-};
-
-interface MediaStreamEventMap {
-    "active": Event;
-    "addtrack": MediaStreamTrackEvent;
-    "inactive": Event;
-    "removetrack": MediaStreamTrackEvent;
-}
-
-interface MediaStream extends EventTarget {
-    readonly active: boolean;
-    readonly id: string;
-    onactive: ((this: MediaStream, ev: Event) => any) | null;
-    onaddtrack: ((this: MediaStream, ev: MediaStreamTrackEvent) => any) | null;
-    oninactive: ((this: MediaStream, ev: Event) => any) | null;
-    onremovetrack: ((this: MediaStream, ev: MediaStreamTrackEvent) => any) | null;
-    addTrack(track: MediaStreamTrack): void;
-    clone(): MediaStream;
-    getAudioTracks(): MediaStreamTrack[];
-    getTrackById(trackId: string): MediaStreamTrack | null;
-    getTracks(): MediaStreamTrack[];
-    getVideoTracks(): MediaStreamTrack[];
-    removeTrack(track: MediaStreamTrack): void;
-    stop(): void;
-    addEventListener<K extends keyof MediaStreamEventMap>(type: K, listener: (this: MediaStream, ev: MediaStreamEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof MediaStreamEventMap>(type: K, listener: (this: MediaStream, ev: MediaStreamEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var MediaStream: {
-    prototype: MediaStream;
-    new(): MediaStream;
-    new(stream: MediaStream): MediaStream;
-    new(tracks: MediaStreamTrack[]): MediaStream;
-};
-
-interface MediaStreamAudioSourceNode extends AudioNode {
-}
-
-declare var MediaStreamAudioSourceNode: {
-    prototype: MediaStreamAudioSourceNode;
-    new(): MediaStreamAudioSourceNode;
-};
-
-interface MediaStreamError {
-    readonly constraintName: string | null;
-    readonly message: string | null;
-    readonly name: string;
-}
-
-declare var MediaStreamError: {
-    prototype: MediaStreamError;
-    new(): MediaStreamError;
-};
-
-interface MediaStreamErrorEvent extends Event {
-    readonly error: MediaStreamError | null;
-}
-
-declare var MediaStreamErrorEvent: {
-    prototype: MediaStreamErrorEvent;
-    new(typeArg: string, eventInitDict?: MediaStreamErrorEventInit): MediaStreamErrorEvent;
-};
-
-interface MediaStreamEvent extends Event {
-    readonly stream: MediaStream | null;
-}
-
-declare var MediaStreamEvent: {
-    prototype: MediaStreamEvent;
-    new(type: string, eventInitDict: MediaStreamEventInit): MediaStreamEvent;
-};
-
-interface MediaStreamTrackEventMap {
-    "ended": MediaStreamErrorEvent;
-    "mute": Event;
-    "overconstrained": MediaStreamErrorEvent;
-    "unmute": Event;
-}
-
-interface MediaStreamTrack extends EventTarget {
-    enabled: boolean;
-    readonly id: string;
-    readonly kind: string;
-    readonly label: string;
-    readonly muted: boolean;
-    onended: ((this: MediaStreamTrack, ev: MediaStreamErrorEvent) => any) | null;
-    onmute: ((this: MediaStreamTrack, ev: Event) => any) | null;
-    onoverconstrained: ((this: MediaStreamTrack, ev: MediaStreamErrorEvent) => any) | null;
-    onunmute: ((this: MediaStreamTrack, ev: Event) => any) | null;
-    readonly readonly: boolean;
-    readonly readyState: MediaStreamTrackState;
-    readonly remote: boolean;
-    applyConstraints(constraints: MediaTrackConstraints): Promise<void>;
-    clone(): MediaStreamTrack;
-    getCapabilities(): MediaTrackCapabilities;
-    getConstraints(): MediaTrackConstraints;
-    getSettings(): MediaTrackSettings;
-    stop(): void;
-    addEventListener<K extends keyof MediaStreamTrackEventMap>(type: K, listener: (this: MediaStreamTrack, ev: MediaStreamTrackEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof MediaStreamTrackEventMap>(type: K, listener: (this: MediaStreamTrack, ev: MediaStreamTrackEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var MediaStreamTrack: {
-    prototype: MediaStreamTrack;
-    new(): MediaStreamTrack;
-};
-
-interface MediaStreamTrackEvent extends Event {
-    readonly track: MediaStreamTrack;
-}
-
-declare var MediaStreamTrackEvent: {
-    prototype: MediaStreamTrackEvent;
-    new(typeArg: string, eventInitDict?: MediaStreamTrackEventInit): MediaStreamTrackEvent;
-};
-
-interface MessageChannel {
-    readonly port1: MessagePort;
-    readonly port2: MessagePort;
-}
-
-declare var MessageChannel: {
-    prototype: MessageChannel;
-    new(): MessageChannel;
-};
-
-interface MessageEvent extends Event {
-    readonly data: any;
-    readonly origin: string;
-    readonly ports: ReadonlyArray<MessagePort>;
-    readonly source: Window | null;
-    initMessageEvent(type: string, bubbles: boolean, cancelable: boolean, data: any, origin: string, lastEventId: string, source: Window): void;
-}
-
-declare var MessageEvent: {
-    prototype: MessageEvent;
-    new(type: string, eventInitDict?: MessageEventInit): MessageEvent;
-};
-
-interface MessagePortEventMap {
-    "message": MessageEvent;
-}
-
-interface MessagePort extends EventTarget {
-    onmessage: ((this: MessagePort, ev: MessageEvent) => any) | null;
-    close(): void;
-    postMessage(message?: any, transfer?: any[]): void;
-    start(): void;
-    addEventListener<K extends keyof MessagePortEventMap>(type: K, listener: (this: MessagePort, ev: MessagePortEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof MessagePortEventMap>(type: K, listener: (this: MessagePort, ev: MessagePortEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var MessagePort: {
-    prototype: MessagePort;
-    new(): MessagePort;
-};
-
-interface MimeType {
-    readonly description: string;
-    readonly enabledPlugin: Plugin;
-    readonly suffixes: string;
-    readonly type: string;
-}
-
-declare var MimeType: {
-    prototype: MimeType;
-    new(): MimeType;
-};
-
-interface MimeTypeArray {
-    readonly length: number;
-    item(index: number): Plugin;
-    namedItem(type: string): Plugin;
-    [index: number]: Plugin;
-}
-
-declare var MimeTypeArray: {
-    prototype: MimeTypeArray;
-    new(): MimeTypeArray;
-};
-
-interface MouseEvent extends UIEvent {
-    readonly altKey: boolean;
-    readonly button: number;
-    readonly buttons: number;
-    readonly clientX: number;
-    readonly clientY: number;
-    readonly ctrlKey: boolean;
-    /** @deprecated */
-    readonly fromElement: Element;
-    readonly layerX: number;
-    readonly layerY: number;
-    readonly metaKey: boolean;
-    readonly movementX: number;
-    readonly movementY: number;
-    readonly offsetX: number;
-    readonly offsetY: number;
-    readonly pageX: number;
-    readonly pageY: number;
-    readonly relatedTarget: EventTarget;
-    readonly screenX: number;
-    readonly screenY: number;
-    readonly shiftKey: boolean;
-    /** @deprecated */
-    readonly toElement: Element;
-    /** @deprecated */
-    readonly which: number;
-    readonly x: number;
-    readonly y: number;
-    getModifierState(keyArg: string): boolean;
-    initMouseEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number, screenXArg: number, screenYArg: number, clientXArg: number, clientYArg: number, ctrlKeyArg: boolean, altKeyArg: boolean, shiftKeyArg: boolean, metaKeyArg: boolean, buttonArg: number, relatedTargetArg: EventTarget | null): void;
-}
-
-declare var MouseEvent: {
-    prototype: MouseEvent;
-    new(typeArg: string, eventInitDict?: MouseEventInit): MouseEvent;
-};
-
-interface MutationEvent extends Event {
-    readonly attrChange: number;
-    readonly attrName: string;
-    readonly newValue: string;
-    readonly prevValue: string;
-    readonly relatedNode: Node;
-    initMutationEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, relatedNodeArg: Node, prevValueArg: string, newValueArg: string, attrNameArg: string, attrChangeArg: number): void;
-    readonly ADDITION: number;
-    readonly MODIFICATION: number;
-    readonly REMOVAL: number;
-}
-
-declare var MutationEvent: {
-    prototype: MutationEvent;
-    new(): MutationEvent;
-    readonly ADDITION: number;
-    readonly MODIFICATION: number;
-    readonly REMOVAL: number;
-};
-
-interface MutationObserver {
-    disconnect(): void;
-    observe(target: Node, options: MutationObserverInit): void;
-    takeRecords(): MutationRecord[];
-}
-
-declare var MutationObserver: {
-    prototype: MutationObserver;
-    new(callback: MutationCallback): MutationObserver;
-};
-
-interface MutationRecord {
-    readonly addedNodes: NodeList;
-    readonly attributeName: string | null;
-    readonly attributeNamespace: string | null;
-    readonly nextSibling: Node | null;
-    readonly oldValue: string | null;
-    readonly previousSibling: Node | null;
-    readonly removedNodes: NodeList;
-    readonly target: Node;
-    readonly type: MutationRecordType;
-}
-
-declare var MutationRecord: {
-    prototype: MutationRecord;
-    new(): MutationRecord;
-};
-
-interface NamedNodeMap {
-    readonly length: number;
-    getNamedItem(qualifiedName: string): Attr | null;
-    getNamedItemNS(namespace: string | null, localName: string): Attr | null;
-    item(index: number): Attr | null;
-    removeNamedItem(qualifiedName: string): Attr;
-    removeNamedItemNS(namespace: string | null, localName: string): Attr;
-    setNamedItem(attr: Attr): Attr | null;
-    setNamedItemNS(attr: Attr): Attr | null;
-    [index: number]: Attr;
-}
-
-declare var NamedNodeMap: {
-    prototype: NamedNodeMap;
-    new(): NamedNodeMap;
-};
-
-interface Navigator extends NavigatorID, NavigatorOnLine, NavigatorContentUtils, NavigatorStorageUtils, MSNavigatorDoNotTrack, MSFileSaver, NavigatorBeacon, NavigatorConcurrentHardware, NavigatorUserMedia, NavigatorLanguage {
-    readonly activeVRDisplays: ReadonlyArray<VRDisplay>;
-    readonly authentication: WebAuthentication;
-    readonly cookieEnabled: boolean;
-    readonly doNotTrack: string | null;
-    gamepadInputEmulation: GamepadInputEmulationType;
-    readonly geolocation: Geolocation;
-    readonly maxTouchPoints: number;
-    readonly mimeTypes: MimeTypeArray;
-    readonly msManipulationViewsEnabled: boolean;
-    readonly msMaxTouchPoints: number;
-    readonly msPointerEnabled: boolean;
-    readonly plugins: PluginArray;
-    readonly pointerEnabled: boolean;
-    readonly serviceWorker: ServiceWorkerContainer;
-    readonly webdriver: boolean;
-    getGamepads(): (Gamepad | null)[];
-    getVRDisplays(): Promise<VRDisplay[]>;
-    javaEnabled(): boolean;
-    msLaunchUri(uri: string, successCallback?: MSLaunchUriCallback, noHandlerCallback?: MSLaunchUriCallback): void;
-    requestMediaKeySystemAccess(keySystem: string, supportedConfigurations: MediaKeySystemConfiguration[]): Promise<MediaKeySystemAccess>;
-    vibrate(pattern: number | number[]): boolean;
-}
-
-declare var Navigator: {
-    prototype: Navigator;
-    new(): Navigator;
-};
-
-interface NavigatorBeacon {
-    sendBeacon(url: string, data?: Blob | Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | FormData | string | null): boolean;
-}
-
-interface NavigatorConcurrentHardware {
-    readonly hardwareConcurrency: number;
-}
-
-interface NavigatorContentUtils {
-}
-
-interface NavigatorID {
-    readonly appCodeName: string;
-    readonly appName: string;
-    readonly appVersion: string;
-    readonly platform: string;
-    readonly product: string;
-    readonly productSub: string;
-    readonly userAgent: string;
-    readonly vendor: string;
-    readonly vendorSub: string;
-}
-
-interface NavigatorLanguage {
-    readonly language: string;
-    readonly languages: ReadonlyArray<string>;
-}
-
-interface NavigatorOnLine {
-    readonly onLine: boolean;
-}
-
-interface NavigatorStorageUtils {
-}
-
-interface NavigatorUserMedia {
-    readonly mediaDevices: MediaDevices;
-    getDisplayMedia(constraints: MediaStreamConstraints): Promise<MediaStream>;
-    getUserMedia(constraints: MediaStreamConstraints, successCallback: NavigatorUserMediaSuccessCallback, errorCallback: NavigatorUserMediaErrorCallback): void;
-}
-
-interface Node extends EventTarget {
-    readonly baseURI: string | null;
-    readonly childNodes: NodeListOf<Node & ChildNode>;
-    readonly firstChild: Node | null;
-    readonly isConnected: boolean;
-    readonly lastChild: Node | null;
-    readonly localName: string | null;
-    readonly namespaceURI: string | null;
-    readonly nextSibling: Node | null;
-    readonly nodeName: string;
-    readonly nodeType: number;
-    nodeValue: string | null;
-    readonly ownerDocument: Document;
-    readonly parentElement: HTMLElement | null;
-    readonly parentNode: Node | null;
-    readonly previousSibling: Node | null;
-    textContent: string | null;
-    appendChild<T extends Node>(newChild: T): T;
-    cloneNode(deep?: boolean): Node;
-    compareDocumentPosition(other: Node): number;
-    contains(child: Node): boolean;
-    hasChildNodes(): boolean;
-    insertBefore<T extends Node>(newChild: T, refChild: Node | null): T;
-    isDefaultNamespace(namespaceURI: string | null): boolean;
-    isEqualNode(arg: Node): boolean;
-    isSameNode(other: Node): boolean;
-    lookupNamespaceURI(prefix: string | null): string | null;
-    lookupPrefix(namespaceURI: string | null): string | null;
-    normalize(): void;
-    removeChild<T extends Node>(oldChild: T): T;
-    replaceChild<T extends Node>(newChild: Node, oldChild: T): T;
-    readonly ATTRIBUTE_NODE: number;
-    readonly CDATA_SECTION_NODE: number;
-    readonly COMMENT_NODE: number;
-    readonly DOCUMENT_FRAGMENT_NODE: number;
-    readonly DOCUMENT_NODE: number;
-    readonly DOCUMENT_POSITION_CONTAINED_BY: number;
-    readonly DOCUMENT_POSITION_CONTAINS: number;
-    readonly DOCUMENT_POSITION_DISCONNECTED: number;
-    readonly DOCUMENT_POSITION_FOLLOWING: number;
-    readonly DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC: number;
-    readonly DOCUMENT_POSITION_PRECEDING: number;
-    readonly DOCUMENT_TYPE_NODE: number;
-    readonly ELEMENT_NODE: number;
-    readonly ENTITY_NODE: number;
-    readonly ENTITY_REFERENCE_NODE: number;
-    readonly NOTATION_NODE: number;
-    readonly PROCESSING_INSTRUCTION_NODE: number;
-    readonly TEXT_NODE: number;
-}
-
-declare var Node: {
-    prototype: Node;
-    new(): Node;
-    readonly ATTRIBUTE_NODE: number;
-    readonly CDATA_SECTION_NODE: number;
-    readonly COMMENT_NODE: number;
-    readonly DOCUMENT_FRAGMENT_NODE: number;
-    readonly DOCUMENT_NODE: number;
-    readonly DOCUMENT_POSITION_CONTAINED_BY: number;
-    readonly DOCUMENT_POSITION_CONTAINS: number;
-    readonly DOCUMENT_POSITION_DISCONNECTED: number;
-    readonly DOCUMENT_POSITION_FOLLOWING: number;
-    readonly DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC: number;
-    readonly DOCUMENT_POSITION_PRECEDING: number;
-    readonly DOCUMENT_TYPE_NODE: number;
-    readonly ELEMENT_NODE: number;
-    readonly ENTITY_NODE: number;
-    readonly ENTITY_REFERENCE_NODE: number;
-    readonly NOTATION_NODE: number;
-    readonly PROCESSING_INSTRUCTION_NODE: number;
-    readonly TEXT_NODE: number;
-};
-
-interface NodeFilter {
-    acceptNode(node: Node): number;
-}
-
-declare var NodeFilter: {
-    readonly FILTER_ACCEPT: number;
-    readonly FILTER_REJECT: number;
-    readonly FILTER_SKIP: number;
-    readonly SHOW_ALL: number;
-    readonly SHOW_ATTRIBUTE: number;
-    readonly SHOW_CDATA_SECTION: number;
-    readonly SHOW_COMMENT: number;
-    readonly SHOW_DOCUMENT: number;
-    readonly SHOW_DOCUMENT_FRAGMENT: number;
-    readonly SHOW_DOCUMENT_TYPE: number;
-    readonly SHOW_ELEMENT: number;
-    readonly SHOW_ENTITY: number;
-    readonly SHOW_ENTITY_REFERENCE: number;
-    readonly SHOW_NOTATION: number;
-    readonly SHOW_PROCESSING_INSTRUCTION: number;
-    readonly SHOW_TEXT: number;
-};
-
-interface NodeIterator {
-    /** @deprecated */
-    readonly expandEntityReferences: boolean;
-    readonly filter: NodeFilter | null;
-    readonly root: Node;
-    readonly whatToShow: number;
-    detach(): void;
-    nextNode(): Node | null;
-    previousNode(): Node | null;
-}
-
-declare var NodeIterator: {
-    prototype: NodeIterator;
-    new(): NodeIterator;
-};
-
-interface NodeList {
-    readonly length: number;
-    item(index: number): Node;
-    [index: number]: Node;
-}
-
-declare var NodeList: {
-    prototype: NodeList;
-    new(): NodeList;
-};
-
-interface NodeListOf<TNode extends Node> extends NodeList {
-    length: number;
-    item(index: number): TNode;
-    [index: number]: TNode;
-}
-
-interface NodeSelector {
-    querySelector<K extends keyof HTMLElementTagNameMap>(selectors: K): HTMLElementTagNameMap[K] | null;
-    querySelector<K extends keyof SVGElementTagNameMap>(selectors: K): SVGElementTagNameMap[K] | null;
-    querySelector<E extends Element = Element>(selectors: string): E | null;
-    querySelectorAll<K extends keyof HTMLElementTagNameMap>(selectors: K): NodeListOf<HTMLElementTagNameMap[K]>;
-    querySelectorAll<K extends keyof SVGElementTagNameMap>(selectors: K): NodeListOf<SVGElementTagNameMap[K]>;
-    querySelectorAll<E extends Element = Element>(selectors: string): NodeListOf<E>;
-}
-
-interface NotificationEventMap {
-    "click": Event;
-    "close": Event;
-    "error": Event;
-    "show": Event;
-}
-
-interface Notification extends EventTarget {
-    readonly body: string | null;
-    readonly data: any;
-    readonly dir: NotificationDirection;
-    readonly icon: string | null;
-    readonly lang: string | null;
-    onclick: ((this: Notification, ev: Event) => any) | null;
-    onclose: ((this: Notification, ev: Event) => any) | null;
-    onerror: ((this: Notification, ev: Event) => any) | null;
-    onshow: ((this: Notification, ev: Event) => any) | null;
-    readonly permission: NotificationPermission;
-    readonly tag: string | null;
-    readonly title: string;
-    close(): void;
-    addEventListener<K extends keyof NotificationEventMap>(type: K, listener: (this: Notification, ev: NotificationEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof NotificationEventMap>(type: K, listener: (this: Notification, ev: NotificationEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var Notification: {
-    prototype: Notification;
-    new(title: string, options?: NotificationOptions): Notification;
-    requestPermission(callback?: NotificationPermissionCallback): Promise<NotificationPermission>;
-};
-
-interface OES_element_index_uint {
-}
-
-declare var OES_element_index_uint: {
-    prototype: OES_element_index_uint;
-    new(): OES_element_index_uint;
-};
-
-interface OES_standard_derivatives {
-    readonly FRAGMENT_SHADER_DERIVATIVE_HINT_OES: number;
-}
-
-declare var OES_standard_derivatives: {
-    prototype: OES_standard_derivatives;
-    new(): OES_standard_derivatives;
-    readonly FRAGMENT_SHADER_DERIVATIVE_HINT_OES: number;
-};
-
-interface OES_texture_float {
-}
-
-declare var OES_texture_float: {
-    prototype: OES_texture_float;
-    new(): OES_texture_float;
-};
-
-interface OES_texture_float_linear {
-}
-
-declare var OES_texture_float_linear: {
-    prototype: OES_texture_float_linear;
-    new(): OES_texture_float_linear;
-};
-
-interface OES_texture_half_float {
-    readonly HALF_FLOAT_OES: number;
-}
-
-declare var OES_texture_half_float: {
-    prototype: OES_texture_half_float;
-    new(): OES_texture_half_float;
-    readonly HALF_FLOAT_OES: number;
-};
-
-interface OES_texture_half_float_linear {
-}
-
-declare var OES_texture_half_float_linear: {
-    prototype: OES_texture_half_float_linear;
-    new(): OES_texture_half_float_linear;
-};
-
-interface OES_vertex_array_object {
-    readonly VERTEX_ARRAY_BINDING_OES: number;
-    bindVertexArrayOES(arrayObject: WebGLVertexArrayObjectOES): void;
-    createVertexArrayOES(): WebGLVertexArrayObjectOES;
-    deleteVertexArrayOES(arrayObject: WebGLVertexArrayObjectOES): void;
-    isVertexArrayOES(value: any): value is WebGLVertexArrayObjectOES;
-}
-
-interface OfflineAudioCompletionEvent extends Event {
-    readonly renderedBuffer: AudioBuffer;
-}
-
-declare var OfflineAudioCompletionEvent: {
-    prototype: OfflineAudioCompletionEvent;
-    new(): OfflineAudioCompletionEvent;
-};
-
-interface OfflineAudioContextEventMap extends AudioContextEventMap {
-    "complete": OfflineAudioCompletionEvent;
-}
-
-interface OfflineAudioContext extends AudioContextBase {
-    readonly length: number;
-    oncomplete: ((this: OfflineAudioContext, ev: OfflineAudioCompletionEvent) => any) | null;
-    startRendering(): Promise<AudioBuffer>;
-    suspend(suspendTime: number): Promise<void>;
-    addEventListener<K extends keyof OfflineAudioContextEventMap>(type: K, listener: (this: OfflineAudioContext, ev: OfflineAudioContextEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof OfflineAudioContextEventMap>(type: K, listener: (this: OfflineAudioContext, ev: OfflineAudioContextEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var OfflineAudioContext: {
-    prototype: OfflineAudioContext;
-    new(numberOfChannels: number, length: number, sampleRate: number): OfflineAudioContext;
-};
-
-interface OscillatorNodeEventMap {
-    "ended": Event;
-}
-
-interface OscillatorNode extends AudioNode {
-    readonly detune: AudioParam;
-    readonly frequency: AudioParam;
-    onended: ((this: OscillatorNode, ev: Event) => any) | null;
-    type: OscillatorType;
-    setPeriodicWave(periodicWave: PeriodicWave): void;
-    start(when?: number): void;
-    stop(when?: number): void;
-    addEventListener<K extends keyof OscillatorNodeEventMap>(type: K, listener: (this: OscillatorNode, ev: OscillatorNodeEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof OscillatorNodeEventMap>(type: K, listener: (this: OscillatorNode, ev: OscillatorNodeEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var OscillatorNode: {
-    prototype: OscillatorNode;
-    new(): OscillatorNode;
-};
-
-interface OverflowEvent extends UIEvent {
-    readonly horizontalOverflow: boolean;
-    readonly orient: number;
-    readonly verticalOverflow: boolean;
-    readonly BOTH: number;
-    readonly HORIZONTAL: number;
-    readonly VERTICAL: number;
-}
-
-declare var OverflowEvent: {
-    prototype: OverflowEvent;
-    new(): OverflowEvent;
-    readonly BOTH: number;
-    readonly HORIZONTAL: number;
-    readonly VERTICAL: number;
-};
-
-interface PageTransitionEvent extends Event {
-    readonly persisted: boolean;
-}
-
-declare var PageTransitionEvent: {
-    prototype: PageTransitionEvent;
-    new(): PageTransitionEvent;
-};
-
-interface PannerNode extends AudioNode {
-    coneInnerAngle: number;
-    coneOuterAngle: number;
-    coneOuterGain: number;
-    distanceModel: DistanceModelType;
-    maxDistance: number;
-    panningModel: PanningModelType;
-    refDistance: number;
-    rolloffFactor: number;
-    /** @deprecated */
-    setOrientation(x: number, y: number, z: number): void;
-    /** @deprecated */
-    setPosition(x: number, y: number, z: number): void;
-    /** @deprecated */
-    setVelocity(x: number, y: number, z: number): void;
-}
-
-declare var PannerNode: {
-    prototype: PannerNode;
-    new(): PannerNode;
-};
-
-interface ParentNode {
-    readonly childElementCount: number;
-    readonly firstElementChild: Element | null;
-    readonly lastElementChild: Element | null;
-}
-
-interface ParentNode {
-    readonly children: HTMLCollection;
-    querySelector<K extends keyof HTMLElementTagNameMap>(selectors: K): HTMLElementTagNameMap[K] | null;
-    querySelector<K extends keyof SVGElementTagNameMap>(selectors: K): SVGElementTagNameMap[K] | null;
-    querySelector<E extends Element = Element>(selectors: string): E | null;
-    querySelectorAll<K extends keyof HTMLElementTagNameMap>(selectors: K): NodeListOf<HTMLElementTagNameMap[K]>;
-    querySelectorAll<K extends keyof SVGElementTagNameMap>(selectors: K): NodeListOf<SVGElementTagNameMap[K]>;
-    querySelectorAll<E extends Element = Element>(selectors: string): NodeListOf<E>;
-}
-
-interface Path2D extends CanvasPathMethods {
-}
-
-declare var Path2D: {
-    prototype: Path2D;
-    new(d?: Path2D | string): Path2D;
-};
-
-interface PaymentAddress {
-    readonly addressLine: string[];
-    readonly city: string;
-    readonly country: string;
-    readonly dependentLocality: string;
-    readonly languageCode: string;
-    readonly organization: string;
-    readonly phone: string;
-    readonly postalCode: string;
-    readonly recipient: string;
-    readonly region: string;
-    readonly sortingCode: string;
-    toJSON(): any;
-}
-
-declare var PaymentAddress: {
-    prototype: PaymentAddress;
-    new(): PaymentAddress;
-};
-
-interface PaymentRequestEventMap {
-    "shippingaddresschange": Event;
-    "shippingoptionchange": Event;
-}
-
-interface PaymentRequest extends EventTarget {
-    readonly id: string;
-    onshippingaddresschange: ((this: PaymentRequest, ev: Event) => any) | null;
-    onshippingoptionchange: ((this: PaymentRequest, ev: Event) => any) | null;
-    readonly shippingAddress: PaymentAddress | null;
-    readonly shippingOption: string | null;
-    readonly shippingType: PaymentShippingType | null;
-    abort(): Promise<void>;
-    canMakePayment(): Promise<boolean>;
-    show(): Promise<PaymentResponse>;
-    addEventListener<K extends keyof PaymentRequestEventMap>(type: K, listener: (this: PaymentRequest, ev: PaymentRequestEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof PaymentRequestEventMap>(type: K, listener: (this: PaymentRequest, ev: PaymentRequestEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var PaymentRequest: {
-    prototype: PaymentRequest;
-    new(methodData: PaymentMethodData[], details: PaymentDetailsInit, options?: PaymentOptions): PaymentRequest;
-};
-
-interface PaymentRequestUpdateEvent extends Event {
-    updateWith(detailsPromise: Promise<PaymentDetailsUpdate>): void;
-}
-
-declare var PaymentRequestUpdateEvent: {
-    prototype: PaymentRequestUpdateEvent;
-    new(type: string, eventInitDict?: PaymentRequestUpdateEventInit): PaymentRequestUpdateEvent;
-};
-
-interface PaymentResponse {
-    readonly details: any;
-    readonly methodName: string;
-    readonly payerEmail: string | null;
-    readonly payerName: string | null;
-    readonly payerPhone: string | null;
-    readonly requestId: string;
-    readonly shippingAddress: PaymentAddress | null;
-    readonly shippingOption: string | null;
-    complete(result?: PaymentComplete): Promise<void>;
-    toJSON(): any;
-}
-
-declare var PaymentResponse: {
-    prototype: PaymentResponse;
-    new(): PaymentResponse;
-};
-
-interface PerfWidgetExternal {
-    readonly activeNetworkRequestCount: number;
-    readonly averageFrameTime: number;
-    readonly averagePaintTime: number;
-    readonly extraInformationEnabled: boolean;
-    readonly independentRenderingEnabled: boolean;
-    readonly irDisablingContentString: string;
-    readonly irStatusAvailable: boolean;
-    readonly maxCpuSpeed: number;
-    readonly paintRequestsPerSecond: number;
-    readonly performanceCounter: number;
-    readonly performanceCounterFrequency: number;
-    addEventListener(eventType: string, callback: Function): void;
-    getMemoryUsage(): number;
-    getProcessCpuUsage(): number;
-    getRecentCpuUsage(last: number | null): any;
-    getRecentFrames(last: number | null): any;
-    getRecentMemoryUsage(last: number | null): any;
-    getRecentPaintRequests(last: number | null): any;
-    removeEventListener(eventType: string, callback: Function): void;
-    repositionWindow(x: number, y: number): void;
-    resizeWindow(width: number, height: number): void;
-}
-
-declare var PerfWidgetExternal: {
-    prototype: PerfWidgetExternal;
-    new(): PerfWidgetExternal;
-};
-
-interface Performance {
-    /** @deprecated */
-    readonly navigation: PerformanceNavigation;
-    readonly timeOrigin: number;
-    /** @deprecated */
-    readonly timing: PerformanceTiming;
-    clearMarks(markName?: string): void;
-    clearMeasures(measureName?: string): void;
-    clearResourceTimings(): void;
-    getEntries(): any;
-    getEntriesByName(name: string, type?: string): any;
-    getEntriesByType(type: string): any;
-    /** @deprecated */
-    getMarks(markName?: string): any;
-    /** @deprecated */
-    getMeasures(measureName?: string): any;
-    mark(markName: string): void;
-    measure(measureName: string, startMarkName?: string, endMarkName?: string): void;
-    now(): number;
-    setResourceTimingBufferSize(maxSize: number): void;
-    toJSON(): any;
-}
-
-declare var Performance: {
-    prototype: Performance;
-    new(): Performance;
-};
-
-interface PerformanceEntry {
-    readonly duration: number;
-    readonly entryType: string;
-    readonly name: string;
-    readonly startTime: number;
-    toJSON(): any;
-}
-
-declare var PerformanceEntry: {
-    prototype: PerformanceEntry;
-    new(): PerformanceEntry;
-};
-
-interface PerformanceMark extends PerformanceEntry {
-}
-
-declare var PerformanceMark: {
-    prototype: PerformanceMark;
-    new(): PerformanceMark;
-};
-
-interface PerformanceMeasure extends PerformanceEntry {
-}
-
-declare var PerformanceMeasure: {
-    prototype: PerformanceMeasure;
-    new(): PerformanceMeasure;
-};
-
-interface PerformanceNavigation {
-    readonly redirectCount: number;
-    readonly type: number;
-    toJSON(): any;
-    readonly TYPE_BACK_FORWARD: number;
-    readonly TYPE_NAVIGATE: number;
-    readonly TYPE_RELOAD: number;
-    readonly TYPE_RESERVED: number;
-}
-
-declare var PerformanceNavigation: {
-    prototype: PerformanceNavigation;
-    new(): PerformanceNavigation;
-    readonly TYPE_BACK_FORWARD: number;
-    readonly TYPE_NAVIGATE: number;
-    readonly TYPE_RELOAD: number;
-    readonly TYPE_RESERVED: number;
-};
-
-interface PerformanceNavigationTiming extends PerformanceEntry {
-    /** @deprecated */
-    readonly connectEnd: number;
-    /** @deprecated */
-    readonly connectStart: number;
-    readonly domComplete: number;
-    readonly domContentLoadedEventEnd: number;
-    readonly domContentLoadedEventStart: number;
-    readonly domInteractive: number;
-    /** @deprecated */
-    readonly domLoading: number;
-    /** @deprecated */
-    readonly domainLookupEnd: number;
-    /** @deprecated */
-    readonly domainLookupStart: number;
-    /** @deprecated */
-    readonly fetchStart: number;
-    readonly loadEventEnd: number;
-    readonly loadEventStart: number;
-    /** @deprecated */
-    readonly navigationStart: number;
-    readonly redirectCount: number;
-    /** @deprecated */
-    readonly redirectEnd: number;
-    /** @deprecated */
-    readonly redirectStart: number;
-    /** @deprecated */
-    readonly requestStart: number;
-    /** @deprecated */
-    readonly responseEnd: number;
-    /** @deprecated */
-    readonly responseStart: number;
-    readonly type: NavigationType;
-    readonly unloadEventEnd: number;
-    readonly unloadEventStart: number;
-    readonly workerStart: number;
-}
-
-declare var PerformanceNavigationTiming: {
-    prototype: PerformanceNavigationTiming;
-    new(): PerformanceNavigationTiming;
-};
-
-interface PerformanceResourceTiming extends PerformanceEntry {
-    readonly connectEnd: number;
-    readonly connectStart: number;
-    readonly domainLookupEnd: number;
-    readonly domainLookupStart: number;
-    readonly fetchStart: number;
-    readonly initiatorType: string;
-    readonly redirectEnd: number;
-    readonly redirectStart: number;
-    readonly requestStart: number;
-    readonly responseEnd: number;
-    readonly responseStart: number;
-    readonly workerStart: number;
-}
-
-declare var PerformanceResourceTiming: {
-    prototype: PerformanceResourceTiming;
-    new(): PerformanceResourceTiming;
-};
-
-interface PerformanceTiming {
-    readonly connectEnd: number;
-    readonly connectStart: number;
-    readonly domComplete: number;
-    readonly domContentLoadedEventEnd: number;
-    readonly domContentLoadedEventStart: number;
-    readonly domInteractive: number;
-    readonly domLoading: number;
-    readonly domainLookupEnd: number;
-    readonly domainLookupStart: number;
-    readonly fetchStart: number;
-    readonly loadEventEnd: number;
-    readonly loadEventStart: number;
-    readonly msFirstPaint: number;
-    readonly navigationStart: number;
-    readonly redirectEnd: number;
-    readonly redirectStart: number;
-    readonly requestStart: number;
-    readonly responseEnd: number;
-    readonly responseStart: number;
-    readonly secureConnectionStart: number;
-    readonly unloadEventEnd: number;
-    readonly unloadEventStart: number;
-    toJSON(): any;
-}
-
-declare var PerformanceTiming: {
-    prototype: PerformanceTiming;
-    new(): PerformanceTiming;
-};
-
-interface PeriodicWave {
-}
-
-declare var PeriodicWave: {
-    prototype: PeriodicWave;
-    new(): PeriodicWave;
-};
-
-interface PermissionRequest extends DeferredPermissionRequest {
-    readonly state: MSWebViewPermissionState;
-    defer(): void;
-}
-
-declare var PermissionRequest: {
-    prototype: PermissionRequest;
-    new(): PermissionRequest;
-};
-
-interface PermissionRequestedEvent extends Event {
-    readonly permissionRequest: PermissionRequest;
-}
-
-declare var PermissionRequestedEvent: {
-    prototype: PermissionRequestedEvent;
-    new(): PermissionRequestedEvent;
-};
-
-interface Plugin {
-    readonly description: string;
-    readonly filename: string;
-    readonly length: number;
-    readonly name: string;
-    readonly version: string;
-    item(index: number): MimeType;
-    namedItem(type: string): MimeType;
-    [index: number]: MimeType;
-}
-
-declare var Plugin: {
-    prototype: Plugin;
-    new(): Plugin;
-};
-
-interface PluginArray {
-    readonly length: number;
-    item(index: number): Plugin;
-    namedItem(name: string): Plugin;
-    refresh(reload?: boolean): void;
-    [index: number]: Plugin;
-}
-
-declare var PluginArray: {
-    prototype: PluginArray;
-    new(): PluginArray;
-};
-
-interface PointerEvent extends MouseEvent {
-    readonly currentPoint: any;
-    readonly height: number;
-    readonly hwTimestamp: number;
-    readonly intermediatePoints: any;
-    readonly isPrimary: boolean;
-    readonly pointerId: number;
-    readonly pointerType: any;
-    readonly pressure: number;
-    readonly rotation: number;
-    readonly tiltX: number;
-    readonly tiltY: number;
-    readonly width: number;
-    getCurrentPoint(element: Element): void;
-    getIntermediatePoints(element: Element): void;
-    initPointerEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number, screenXArg: number, screenYArg: number, clientXArg: number, clientYArg: number, ctrlKeyArg: boolean, altKeyArg: boolean, shiftKeyArg: boolean, metaKeyArg: boolean, buttonArg: number, relatedTargetArg: EventTarget, offsetXArg: number, offsetYArg: number, widthArg: number, heightArg: number, pressure: number, rotation: number, tiltX: number, tiltY: number, pointerIdArg: number, pointerType: any, hwTimestampArg: number, isPrimary: boolean): void;
-}
-
-declare var PointerEvent: {
-    prototype: PointerEvent;
-    new(typeArg: string, eventInitDict?: PointerEventInit): PointerEvent;
-};
-
-interface PopStateEvent extends Event {
-    readonly state: any;
-}
-
-declare var PopStateEvent: {
-    prototype: PopStateEvent;
-    new(type: string, eventInitDict?: PopStateEventInit): PopStateEvent;
-};
-
-interface Position {
-    readonly coords: Coordinates;
-    readonly timestamp: number;
-}
-
-declare var Position: {
-    prototype: Position;
-    new(): Position;
-};
-
-interface PositionError {
-    readonly code: number;
-    readonly message: string;
-    toString(): string;
-    readonly PERMISSION_DENIED: number;
-    readonly POSITION_UNAVAILABLE: number;
-    readonly TIMEOUT: number;
-}
-
-declare var PositionError: {
-    prototype: PositionError;
-    new(): PositionError;
-    readonly PERMISSION_DENIED: number;
-    readonly POSITION_UNAVAILABLE: number;
-    readonly TIMEOUT: number;
-};
-
-interface ProcessingInstruction extends CharacterData {
-    readonly target: string;
-}
-
-declare var ProcessingInstruction: {
-    prototype: ProcessingInstruction;
-    new(): ProcessingInstruction;
-};
-
-interface ProgressEvent extends Event {
-    readonly lengthComputable: boolean;
-    readonly loaded: number;
-    readonly total: number;
-    initProgressEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, lengthComputableArg: boolean, loadedArg: number, totalArg: number): void;
-}
-
-declare var ProgressEvent: {
-    prototype: ProgressEvent;
-    new(typeArg: string, eventInitDict?: ProgressEventInit): ProgressEvent;
-};
-
-interface PromiseRejectionEvent extends Event {
-    readonly promise: PromiseLike<any>;
-    readonly reason: any;
-}
-
-interface PromiseRejectionEventInit extends EventInit {
-    promise: PromiseLike<any>;
-    reason?: any;
-}
-
-interface PushManager {
-    readonly supportedContentEncodings: ReadonlyArray<string>;
-    getSubscription(): Promise<PushSubscription | null>;
-    permissionState(options?: PushSubscriptionOptionsInit): Promise<PushPermissionState>;
-    subscribe(options?: PushSubscriptionOptionsInit): Promise<PushSubscription>;
-}
-
-declare var PushManager: {
-    prototype: PushManager;
-    new(): PushManager;
-};
-
-interface PushSubscription {
-    readonly endpoint: string;
-    readonly expirationTime: number | null;
-    readonly options: PushSubscriptionOptions;
-    getKey(name: PushEncryptionKeyName): ArrayBuffer | null;
-    toJSON(): any;
-    unsubscribe(): Promise<boolean>;
-}
-
-declare var PushSubscription: {
-    prototype: PushSubscription;
-    new(): PushSubscription;
-};
-
-interface PushSubscriptionOptions {
-    readonly applicationServerKey: ArrayBuffer | null;
-    readonly userVisibleOnly: boolean;
-}
-
-declare var PushSubscriptionOptions: {
-    prototype: PushSubscriptionOptions;
-    new(): PushSubscriptionOptions;
-};
-
-interface RTCDTMFToneChangeEvent extends Event {
-    readonly tone: string;
-}
-
-declare var RTCDTMFToneChangeEvent: {
-    prototype: RTCDTMFToneChangeEvent;
-    new(typeArg: string, eventInitDict: RTCDTMFToneChangeEventInit): RTCDTMFToneChangeEvent;
-};
-
-interface RTCDtlsTransportEventMap {
-    "dtlsstatechange": RTCDtlsTransportStateChangedEvent;
-    "error": Event;
-}
-
-interface RTCDtlsTransport extends RTCStatsProvider {
-    ondtlsstatechange: ((this: RTCDtlsTransport, ev: RTCDtlsTransportStateChangedEvent) => any) | null;
-    onerror: ((this: RTCDtlsTransport, ev: Event) => any) | null;
-    readonly state: RTCDtlsTransportState;
-    readonly transport: RTCIceTransport;
-    getLocalParameters(): RTCDtlsParameters;
-    getRemoteCertificates(): ArrayBuffer[];
-    getRemoteParameters(): RTCDtlsParameters | null;
-    start(remoteParameters: RTCDtlsParameters): void;
-    stop(): void;
-    addEventListener<K extends keyof RTCDtlsTransportEventMap>(type: K, listener: (this: RTCDtlsTransport, ev: RTCDtlsTransportEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCDtlsTransportEventMap>(type: K, listener: (this: RTCDtlsTransport, ev: RTCDtlsTransportEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var RTCDtlsTransport: {
-    prototype: RTCDtlsTransport;
-    new(transport: RTCIceTransport): RTCDtlsTransport;
-};
-
-interface RTCDtlsTransportStateChangedEvent extends Event {
-    readonly state: RTCDtlsTransportState;
-}
-
-declare var RTCDtlsTransportStateChangedEvent: {
-    prototype: RTCDtlsTransportStateChangedEvent;
-    new(): RTCDtlsTransportStateChangedEvent;
-};
-
-interface RTCDtmfSenderEventMap {
-    "tonechange": RTCDTMFToneChangeEvent;
-}
-
-interface RTCDtmfSender extends EventTarget {
-    readonly canInsertDTMF: boolean;
-    readonly duration: number;
-    readonly interToneGap: number;
-    ontonechange: ((this: RTCDtmfSender, ev: RTCDTMFToneChangeEvent) => any) | null;
-    readonly sender: RTCRtpSender;
-    readonly toneBuffer: string;
-    insertDTMF(tones: string, duration?: number, interToneGap?: number): void;
-    addEventListener<K extends keyof RTCDtmfSenderEventMap>(type: K, listener: (this: RTCDtmfSender, ev: RTCDtmfSenderEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCDtmfSenderEventMap>(type: K, listener: (this: RTCDtmfSender, ev: RTCDtmfSenderEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var RTCDtmfSender: {
-    prototype: RTCDtmfSender;
-    new(sender: RTCRtpSender): RTCDtmfSender;
-};
-
-interface RTCIceCandidate {
-    candidate: string | null;
-    sdpMLineIndex: number | null;
-    sdpMid: string | null;
-    toJSON(): any;
-}
-
-declare var RTCIceCandidate: {
-    prototype: RTCIceCandidate;
-    new(candidateInitDict?: RTCIceCandidateInit): RTCIceCandidate;
-};
-
-interface RTCIceCandidatePairChangedEvent extends Event {
-    readonly pair: RTCIceCandidatePair;
-}
-
-declare var RTCIceCandidatePairChangedEvent: {
-    prototype: RTCIceCandidatePairChangedEvent;
-    new(): RTCIceCandidatePairChangedEvent;
-};
-
-interface RTCIceGathererEventMap {
-    "error": Event;
-    "localcandidate": RTCIceGathererEvent;
-}
-
-interface RTCIceGatherer extends RTCStatsProvider {
-    readonly component: RTCIceComponent;
-    onerror: ((this: RTCIceGatherer, ev: Event) => any) | null;
-    onlocalcandidate: ((this: RTCIceGatherer, ev: RTCIceGathererEvent) => any) | null;
-    createAssociatedGatherer(): RTCIceGatherer;
-    getLocalCandidates(): RTCIceCandidateDictionary[];
-    getLocalParameters(): RTCIceParameters;
-    addEventListener<K extends keyof RTCIceGathererEventMap>(type: K, listener: (this: RTCIceGatherer, ev: RTCIceGathererEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCIceGathererEventMap>(type: K, listener: (this: RTCIceGatherer, ev: RTCIceGathererEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var RTCIceGatherer: {
-    prototype: RTCIceGatherer;
-    new(options: RTCIceGatherOptions): RTCIceGatherer;
-};
-
-interface RTCIceGathererEvent extends Event {
-    readonly candidate: RTCIceCandidateDictionary | RTCIceCandidateComplete;
-}
-
-declare var RTCIceGathererEvent: {
-    prototype: RTCIceGathererEvent;
-    new(): RTCIceGathererEvent;
-};
-
-interface RTCIceTransportEventMap {
-    "candidatepairchange": RTCIceCandidatePairChangedEvent;
-    "icestatechange": RTCIceTransportStateChangedEvent;
-}
-
-interface RTCIceTransport extends RTCStatsProvider {
-    readonly component: RTCIceComponent;
-    readonly iceGatherer: RTCIceGatherer | null;
-    oncandidatepairchange: ((this: RTCIceTransport, ev: RTCIceCandidatePairChangedEvent) => any) | null;
-    onicestatechange: ((this: RTCIceTransport, ev: RTCIceTransportStateChangedEvent) => any) | null;
-    readonly role: RTCIceRole;
-    readonly state: RTCIceTransportState;
-    addRemoteCandidate(remoteCandidate: RTCIceCandidateDictionary | RTCIceCandidateComplete): void;
-    createAssociatedTransport(): RTCIceTransport;
-    getNominatedCandidatePair(): RTCIceCandidatePair | null;
-    getRemoteCandidates(): RTCIceCandidateDictionary[];
-    getRemoteParameters(): RTCIceParameters | null;
-    setRemoteCandidates(remoteCandidates: RTCIceCandidateDictionary[]): void;
-    start(gatherer: RTCIceGatherer, remoteParameters: RTCIceParameters, role?: RTCIceRole): void;
-    stop(): void;
-    addEventListener<K extends keyof RTCIceTransportEventMap>(type: K, listener: (this: RTCIceTransport, ev: RTCIceTransportEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCIceTransportEventMap>(type: K, listener: (this: RTCIceTransport, ev: RTCIceTransportEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var RTCIceTransport: {
-    prototype: RTCIceTransport;
-    new(): RTCIceTransport;
-};
-
-interface RTCIceTransportStateChangedEvent extends Event {
-    readonly state: RTCIceTransportState;
-}
-
-declare var RTCIceTransportStateChangedEvent: {
-    prototype: RTCIceTransportStateChangedEvent;
-    new(): RTCIceTransportStateChangedEvent;
-};
-
-interface RTCPeerConnectionEventMap {
-    "addstream": MediaStreamEvent;
-    "icecandidate": RTCPeerConnectionIceEvent;
-    "iceconnectionstatechange": Event;
-    "icegatheringstatechange": Event;
-    "negotiationneeded": Event;
-    "removestream": MediaStreamEvent;
-    "signalingstatechange": Event;
-}
-
-interface RTCPeerConnection extends EventTarget {
-    readonly canTrickleIceCandidates: boolean | null;
-    readonly iceConnectionState: RTCIceConnectionState;
-    readonly iceGatheringState: RTCIceGatheringState;
-    readonly localDescription: RTCSessionDescription | null;
-    onaddstream: ((this: RTCPeerConnection, ev: MediaStreamEvent) => any) | null;
-    onicecandidate: ((this: RTCPeerConnection, ev: RTCPeerConnectionIceEvent) => any) | null;
-    oniceconnectionstatechange: ((this: RTCPeerConnection, ev: Event) => any) | null;
-    onicegatheringstatechange: ((this: RTCPeerConnection, ev: Event) => any) | null;
-    onnegotiationneeded: ((this: RTCPeerConnection, ev: Event) => any) | null;
-    onremovestream: ((this: RTCPeerConnection, ev: MediaStreamEvent) => any) | null;
-    onsignalingstatechange: ((this: RTCPeerConnection, ev: Event) => any) | null;
-    readonly remoteDescription: RTCSessionDescription | null;
-    readonly signalingState: RTCSignalingState;
-    addIceCandidate(candidate: RTCIceCandidateInit | RTCIceCandidate): Promise<void>;
-    addStream(stream: MediaStream): void;
-    close(): void;
-    createAnswer(options?: RTCOfferOptions): Promise<RTCSessionDescriptionInit>;
-    createOffer(options?: RTCOfferOptions): Promise<RTCSessionDescriptionInit>;
-    getConfiguration(): RTCConfiguration;
-    getLocalStreams(): MediaStream[];
-    getRemoteStreams(): MediaStream[];
-    getStats(selector: MediaStreamTrack | null, successCallback?: RTCStatsCallback, failureCallback?: RTCPeerConnectionErrorCallback): Promise<RTCStatsReport>;
-    getStreamById(streamId: string): MediaStream | null;
-    removeStream(stream: MediaStream): void;
-    setLocalDescription(description: RTCSessionDescriptionInit): Promise<void>;
-    setRemoteDescription(description: RTCSessionDescriptionInit): Promise<void>;
-    addEventListener<K extends keyof RTCPeerConnectionEventMap>(type: K, listener: (this: RTCPeerConnection, ev: RTCPeerConnectionEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCPeerConnectionEventMap>(type: K, listener: (this: RTCPeerConnection, ev: RTCPeerConnectionEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var RTCPeerConnection: {
-    prototype: RTCPeerConnection;
-    new(configuration: RTCConfiguration): RTCPeerConnection;
-};
-
-interface RTCPeerConnectionIceEvent extends Event {
-    readonly candidate: RTCIceCandidate;
-}
-
-declare var RTCPeerConnectionIceEvent: {
-    prototype: RTCPeerConnectionIceEvent;
-    new(type: string, eventInitDict: RTCPeerConnectionIceEventInit): RTCPeerConnectionIceEvent;
-};
-
-interface RTCRtpReceiverEventMap {
-    "error": Event;
-    "msdecodercapacitychange": Event;
-    "msdsh": Event;
-}
-
-interface RTCRtpReceiver extends RTCStatsProvider {
-    onerror: ((this: RTCRtpReceiver, ev: Event) => any) | null;
-    onmsdecodercapacitychange: ((this: RTCRtpReceiver, ev: Event) => any) | null;
-    onmsdsh: ((this: RTCRtpReceiver, ev: Event) => any) | null;
-    readonly rtcpTransport: RTCDtlsTransport;
-    readonly track: MediaStreamTrack | null;
-    readonly transport: RTCDtlsTransport | RTCSrtpSdesTransport;
-    getContributingSources(): RTCRtpContributingSource[];
-    receive(parameters: RTCRtpParameters): void;
-    requestSendCSRC(csrc: number): void;
-    setTransport(transport: RTCDtlsTransport | RTCSrtpSdesTransport, rtcpTransport?: RTCDtlsTransport): void;
-    stop(): void;
-    addEventListener<K extends keyof RTCRtpReceiverEventMap>(type: K, listener: (this: RTCRtpReceiver, ev: RTCRtpReceiverEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCRtpReceiverEventMap>(type: K, listener: (this: RTCRtpReceiver, ev: RTCRtpReceiverEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var RTCRtpReceiver: {
-    prototype: RTCRtpReceiver;
-    new(transport: RTCDtlsTransport | RTCSrtpSdesTransport, kind: string, rtcpTransport?: RTCDtlsTransport): RTCRtpReceiver;
-    getCapabilities(kind?: string): RTCRtpCapabilities;
-};
-
-interface RTCRtpSenderEventMap {
-    "error": Event;
-    "ssrcconflict": RTCSsrcConflictEvent;
-}
-
-interface RTCRtpSender extends RTCStatsProvider {
-    onerror: ((this: RTCRtpSender, ev: Event) => any) | null;
-    onssrcconflict: ((this: RTCRtpSender, ev: RTCSsrcConflictEvent) => any) | null;
-    readonly rtcpTransport: RTCDtlsTransport;
-    readonly track: MediaStreamTrack;
-    readonly transport: RTCDtlsTransport | RTCSrtpSdesTransport;
-    send(parameters: RTCRtpParameters): void;
-    setTrack(track: MediaStreamTrack): void;
-    setTransport(transport: RTCDtlsTransport | RTCSrtpSdesTransport, rtcpTransport?: RTCDtlsTransport): void;
-    stop(): void;
-    addEventListener<K extends keyof RTCRtpSenderEventMap>(type: K, listener: (this: RTCRtpSender, ev: RTCRtpSenderEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCRtpSenderEventMap>(type: K, listener: (this: RTCRtpSender, ev: RTCRtpSenderEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var RTCRtpSender: {
-    prototype: RTCRtpSender;
-    new(track: MediaStreamTrack, transport: RTCDtlsTransport | RTCSrtpSdesTransport, rtcpTransport?: RTCDtlsTransport): RTCRtpSender;
-    getCapabilities(kind?: string): RTCRtpCapabilities;
-};
-
-interface RTCSessionDescription {
-    sdp: string | null;
-    type: RTCSdpType | null;
-    toJSON(): any;
-}
-
-declare var RTCSessionDescription: {
-    prototype: RTCSessionDescription;
-    new(descriptionInitDict?: RTCSessionDescriptionInit): RTCSessionDescription;
-};
-
-interface RTCSrtpSdesTransportEventMap {
-    "error": Event;
-}
-
-interface RTCSrtpSdesTransport extends EventTarget {
-    onerror: ((this: RTCSrtpSdesTransport, ev: Event) => any) | null;
-    readonly transport: RTCIceTransport;
-    addEventListener<K extends keyof RTCSrtpSdesTransportEventMap>(type: K, listener: (this: RTCSrtpSdesTransport, ev: RTCSrtpSdesTransportEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCSrtpSdesTransportEventMap>(type: K, listener: (this: RTCSrtpSdesTransport, ev: RTCSrtpSdesTransportEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var RTCSrtpSdesTransport: {
-    prototype: RTCSrtpSdesTransport;
-    new(transport: RTCIceTransport, encryptParameters: RTCSrtpSdesParameters, decryptParameters: RTCSrtpSdesParameters): RTCSrtpSdesTransport;
-    getLocalParameters(): RTCSrtpSdesParameters[];
-};
-
-interface RTCSsrcConflictEvent extends Event {
-    readonly ssrc: number;
-}
-
-declare var RTCSsrcConflictEvent: {
-    prototype: RTCSsrcConflictEvent;
-    new(): RTCSsrcConflictEvent;
-};
-
-interface RTCStatsProvider extends EventTarget {
-    getStats(): Promise<RTCStatsReport>;
-    msGetStats(): Promise<RTCStatsReport>;
-}
-
-declare var RTCStatsProvider: {
-    prototype: RTCStatsProvider;
-    new(): RTCStatsProvider;
-};
-
-interface RandomSource {
-    getRandomValues<T extends Int8Array | Uint8ClampedArray | Uint8Array | Int16Array | Uint16Array | Int32Array | Uint32Array>(array: T): T;
-}
-
-declare var RandomSource: {
-    prototype: RandomSource;
-    new(): RandomSource;
-};
-
-interface Range {
-    readonly collapsed: boolean;
-    readonly commonAncestorContainer: Node;
-    readonly endContainer: Node;
-    readonly endOffset: number;
-    readonly startContainer: Node;
-    readonly startOffset: number;
-    cloneContents(): DocumentFragment;
-    cloneRange(): Range;
-    collapse(toStart?: boolean): void;
-    compareBoundaryPoints(how: number, sourceRange: Range): number;
-    createContextualFragment(fragment: string): DocumentFragment;
-    deleteContents(): void;
-    detach(): void;
-    expand(Unit: ExpandGranularity): boolean;
-    extractContents(): DocumentFragment;
-    getBoundingClientRect(): ClientRect | DOMRect;
-    getClientRects(): ClientRectList | DOMRectList;
-    insertNode(node: Node): void;
-    isPointInRange(node: Node, offset: number): boolean;
-    selectNode(node: Node): void;
-    selectNodeContents(node: Node): void;
-    setEnd(node: Node, offset: number): void;
-    setEndAfter(node: Node): void;
-    setEndBefore(node: Node): void;
-    setStart(node: Node, offset: number): void;
-    setStartAfter(node: Node): void;
-    setStartBefore(node: Node): void;
-    surroundContents(newParent: Node): void;
-    toString(): string;
-    readonly END_TO_END: number;
-    readonly END_TO_START: number;
-    readonly START_TO_END: number;
-    readonly START_TO_START: number;
-}
-
-declare var Range: {
-    prototype: Range;
-    new(): Range;
-    readonly END_TO_END: number;
-    readonly END_TO_START: number;
-    readonly START_TO_END: number;
-    readonly START_TO_START: number;
-};
-
-interface ReadableStream {
-    readonly locked: boolean;
-    cancel(): Promise<void>;
-    getReader(): ReadableStreamReader;
-}
-
-declare var ReadableStream: {
-    prototype: ReadableStream;
-    new(): ReadableStream;
-};
-
-interface ReadableStreamReader {
-    cancel(): Promise<void>;
-    read(): Promise<any>;
-    releaseLock(): void;
-}
-
-declare var ReadableStreamReader: {
-    prototype: ReadableStreamReader;
-    new(): ReadableStreamReader;
-};
-
-interface Request extends Body {
-    readonly cache: RequestCache;
-    readonly credentials: RequestCredentials;
-    readonly destination: RequestDestination;
-    readonly headers: Headers;
-    readonly integrity: string;
-    readonly keepalive: boolean;
-    readonly method: string;
-    readonly mode: RequestMode;
-    readonly redirect: RequestRedirect;
-    readonly referrer: string;
-    readonly referrerPolicy: ReferrerPolicy;
-    readonly signal: AbortSignal | null;
-    readonly type: RequestType;
-    readonly url: string;
-    clone(): Request;
-}
-
-declare var Request: {
-    prototype: Request;
-    new(input: Request | string, init?: RequestInit): Request;
-};
-
-interface Response extends Body {
-    readonly body: ReadableStream | null;
-    readonly headers: Headers;
-    readonly ok: boolean;
-    readonly redirected: boolean;
-    readonly status: number;
-    readonly statusText: string;
-    readonly type: ResponseType;
-    readonly url: string;
-    clone(): Response;
-}
-
-declare var Response: {
-    prototype: Response;
-    new(body?: Blob | Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | FormData | string | null, init?: ResponseInit): Response;
-    error(): Response;
-    redirect(url: string, status?: number): Response;
-};
-
-interface SVGAElement extends SVGGraphicsElement, SVGURIReference {
-    readonly target: SVGAnimatedString;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGAElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGAElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGAElement: {
-    prototype: SVGAElement;
-    new(): SVGAElement;
-};
-
-interface SVGAngle {
-    readonly unitType: number;
-    value: number;
-    valueAsString: string;
-    valueInSpecifiedUnits: number;
-    convertToSpecifiedUnits(unitType: number): void;
-    newValueSpecifiedUnits(unitType: number, valueInSpecifiedUnits: number): void;
-    readonly SVG_ANGLETYPE_DEG: number;
-    readonly SVG_ANGLETYPE_GRAD: number;
-    readonly SVG_ANGLETYPE_RAD: number;
-    readonly SVG_ANGLETYPE_UNKNOWN: number;
-    readonly SVG_ANGLETYPE_UNSPECIFIED: number;
-}
-
-declare var SVGAngle: {
-    prototype: SVGAngle;
-    new(): SVGAngle;
-    readonly SVG_ANGLETYPE_DEG: number;
-    readonly SVG_ANGLETYPE_GRAD: number;
-    readonly SVG_ANGLETYPE_RAD: number;
-    readonly SVG_ANGLETYPE_UNKNOWN: number;
-    readonly SVG_ANGLETYPE_UNSPECIFIED: number;
-};
-
-interface SVGAnimatedAngle {
-    readonly animVal: SVGAngle;
-    readonly baseVal: SVGAngle;
-}
-
-declare var SVGAnimatedAngle: {
-    prototype: SVGAnimatedAngle;
-    new(): SVGAnimatedAngle;
-};
-
-interface SVGAnimatedBoolean {
-    readonly animVal: boolean;
-    baseVal: boolean;
-}
-
-declare var SVGAnimatedBoolean: {
-    prototype: SVGAnimatedBoolean;
-    new(): SVGAnimatedBoolean;
-};
-
-interface SVGAnimatedEnumeration {
-    readonly animVal: number;
-    baseVal: number;
-}
-
-declare var SVGAnimatedEnumeration: {
-    prototype: SVGAnimatedEnumeration;
-    new(): SVGAnimatedEnumeration;
-};
-
-interface SVGAnimatedInteger {
-    readonly animVal: number;
-    baseVal: number;
-}
-
-declare var SVGAnimatedInteger: {
-    prototype: SVGAnimatedInteger;
-    new(): SVGAnimatedInteger;
-};
-
-interface SVGAnimatedLength {
-    readonly animVal: SVGLength;
-    readonly baseVal: SVGLength;
-}
-
-declare var SVGAnimatedLength: {
-    prototype: SVGAnimatedLength;
-    new(): SVGAnimatedLength;
-};
-
-interface SVGAnimatedLengthList {
-    readonly animVal: SVGLengthList;
-    readonly baseVal: SVGLengthList;
-}
-
-declare var SVGAnimatedLengthList: {
-    prototype: SVGAnimatedLengthList;
-    new(): SVGAnimatedLengthList;
-};
-
-interface SVGAnimatedNumber {
-    readonly animVal: number;
-    baseVal: number;
-}
-
-declare var SVGAnimatedNumber: {
-    prototype: SVGAnimatedNumber;
-    new(): SVGAnimatedNumber;
-};
-
-interface SVGAnimatedNumberList {
-    readonly animVal: SVGNumberList;
-    readonly baseVal: SVGNumberList;
-}
-
-declare var SVGAnimatedNumberList: {
-    prototype: SVGAnimatedNumberList;
-    new(): SVGAnimatedNumberList;
-};
-
-interface SVGAnimatedPoints {
-    readonly animatedPoints: SVGPointList;
-    readonly points: SVGPointList;
-}
-
-interface SVGAnimatedPreserveAspectRatio {
-    readonly animVal: SVGPreserveAspectRatio;
-    readonly baseVal: SVGPreserveAspectRatio;
-}
-
-declare var SVGAnimatedPreserveAspectRatio: {
-    prototype: SVGAnimatedPreserveAspectRatio;
-    new(): SVGAnimatedPreserveAspectRatio;
-};
-
-interface SVGAnimatedRect {
-    readonly animVal: SVGRect;
-    readonly baseVal: SVGRect;
-}
-
-declare var SVGAnimatedRect: {
-    prototype: SVGAnimatedRect;
-    new(): SVGAnimatedRect;
-};
-
-interface SVGAnimatedString {
-    readonly animVal: string;
-    baseVal: string;
-}
-
-declare var SVGAnimatedString: {
-    prototype: SVGAnimatedString;
-    new(): SVGAnimatedString;
-};
-
-interface SVGAnimatedTransformList {
-    readonly animVal: SVGTransformList;
-    readonly baseVal: SVGTransformList;
-}
-
-declare var SVGAnimatedTransformList: {
-    prototype: SVGAnimatedTransformList;
-    new(): SVGAnimatedTransformList;
-};
-
-interface SVGCircleElement extends SVGGraphicsElement {
-    readonly cx: SVGAnimatedLength;
-    readonly cy: SVGAnimatedLength;
-    readonly r: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGCircleElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGCircleElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGCircleElement: {
-    prototype: SVGCircleElement;
-    new(): SVGCircleElement;
-};
-
-interface SVGClipPathElement extends SVGGraphicsElement, SVGUnitTypes {
-    readonly clipPathUnits: SVGAnimatedEnumeration;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGClipPathElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGClipPathElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGClipPathElement: {
-    prototype: SVGClipPathElement;
-    new(): SVGClipPathElement;
-};
-
-interface SVGComponentTransferFunctionElement extends SVGElement {
-    readonly amplitude: SVGAnimatedNumber;
-    readonly exponent: SVGAnimatedNumber;
-    readonly intercept: SVGAnimatedNumber;
-    readonly offset: SVGAnimatedNumber;
-    readonly slope: SVGAnimatedNumber;
-    readonly tableValues: SVGAnimatedNumberList;
-    readonly type: SVGAnimatedEnumeration;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_DISCRETE: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_GAMMA: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_IDENTITY: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_LINEAR: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_TABLE: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGComponentTransferFunctionElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGComponentTransferFunctionElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGComponentTransferFunctionElement: {
-    prototype: SVGComponentTransferFunctionElement;
-    new(): SVGComponentTransferFunctionElement;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_DISCRETE: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_GAMMA: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_IDENTITY: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_LINEAR: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_TABLE: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_UNKNOWN: number;
-};
-
-interface SVGDefsElement extends SVGGraphicsElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGDefsElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGDefsElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGDefsElement: {
-    prototype: SVGDefsElement;
-    new(): SVGDefsElement;
-};
-
-interface SVGDescElement extends SVGElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGDescElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGDescElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGDescElement: {
-    prototype: SVGDescElement;
-    new(): SVGDescElement;
-};
-
-interface SVGElementEventMap extends ElementEventMap {
-    "click": MouseEvent;
-    "dblclick": MouseEvent;
-    "focusin": FocusEvent;
-    "focusout": FocusEvent;
-    "load": Event;
-    "mousedown": MouseEvent;
-    "mousemove": MouseEvent;
-    "mouseout": MouseEvent;
-    "mouseover": MouseEvent;
-    "mouseup": MouseEvent;
-}
-
-interface SVGElement extends Element, ElementCSSInlineStyle {
-    readonly className: any;
-    onclick: ((this: SVGElement, ev: MouseEvent) => any) | null;
-    ondblclick: ((this: SVGElement, ev: MouseEvent) => any) | null;
-    onfocusin: ((this: SVGElement, ev: FocusEvent) => any) | null;
-    onfocusout: ((this: SVGElement, ev: FocusEvent) => any) | null;
-    onload: ((this: SVGElement, ev: Event) => any) | null;
-    onmousedown: ((this: SVGElement, ev: MouseEvent) => any) | null;
-    onmousemove: ((this: SVGElement, ev: MouseEvent) => any) | null;
-    onmouseout: ((this: SVGElement, ev: MouseEvent) => any) | null;
-    onmouseover: ((this: SVGElement, ev: MouseEvent) => any) | null;
-    onmouseup: ((this: SVGElement, ev: MouseEvent) => any) | null;
-    readonly ownerSVGElement: SVGSVGElement | null;
-    readonly viewportElement: SVGElement | null;
-    /** @deprecated */
-    xmlbase: string;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGElement: {
-    prototype: SVGElement;
-    new(): SVGElement;
-};
-
-interface SVGElementInstance extends EventTarget {
-    readonly childNodes: SVGElementInstanceList;
-    readonly correspondingElement: SVGElement;
-    readonly correspondingUseElement: SVGUseElement;
-    readonly firstChild: SVGElementInstance;
-    readonly lastChild: SVGElementInstance;
-    readonly nextSibling: SVGElementInstance;
-    readonly parentNode: SVGElementInstance;
-    readonly previousSibling: SVGElementInstance;
-}
-
-declare var SVGElementInstance: {
-    prototype: SVGElementInstance;
-    new(): SVGElementInstance;
-};
-
-interface SVGElementInstanceList {
-    /** @deprecated */
-    readonly length: number;
-    /** @deprecated */
-    item(index: number): SVGElementInstance;
-}
-
-declare var SVGElementInstanceList: {
-    prototype: SVGElementInstanceList;
-    new(): SVGElementInstanceList;
-};
-
-interface SVGEllipseElement extends SVGGraphicsElement {
-    readonly cx: SVGAnimatedLength;
-    readonly cy: SVGAnimatedLength;
-    readonly rx: SVGAnimatedLength;
-    readonly ry: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGEllipseElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGEllipseElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGEllipseElement: {
-    prototype: SVGEllipseElement;
-    new(): SVGEllipseElement;
-};
-
-interface SVGFEBlendElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    readonly in2: SVGAnimatedString;
-    readonly mode: SVGAnimatedEnumeration;
-    readonly SVG_FEBLEND_MODE_COLOR: number;
-    readonly SVG_FEBLEND_MODE_COLOR_BURN: number;
-    readonly SVG_FEBLEND_MODE_COLOR_DODGE: number;
-    readonly SVG_FEBLEND_MODE_DARKEN: number;
-    readonly SVG_FEBLEND_MODE_DIFFERENCE: number;
-    readonly SVG_FEBLEND_MODE_EXCLUSION: number;
-    readonly SVG_FEBLEND_MODE_HARD_LIGHT: number;
-    readonly SVG_FEBLEND_MODE_HUE: number;
-    readonly SVG_FEBLEND_MODE_LIGHTEN: number;
-    readonly SVG_FEBLEND_MODE_LUMINOSITY: number;
-    readonly SVG_FEBLEND_MODE_MULTIPLY: number;
-    readonly SVG_FEBLEND_MODE_NORMAL: number;
-    readonly SVG_FEBLEND_MODE_OVERLAY: number;
-    readonly SVG_FEBLEND_MODE_SATURATION: number;
-    readonly SVG_FEBLEND_MODE_SCREEN: number;
-    readonly SVG_FEBLEND_MODE_SOFT_LIGHT: number;
-    readonly SVG_FEBLEND_MODE_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEBlendElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEBlendElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEBlendElement: {
-    prototype: SVGFEBlendElement;
-    new(): SVGFEBlendElement;
-    readonly SVG_FEBLEND_MODE_COLOR: number;
-    readonly SVG_FEBLEND_MODE_COLOR_BURN: number;
-    readonly SVG_FEBLEND_MODE_COLOR_DODGE: number;
-    readonly SVG_FEBLEND_MODE_DARKEN: number;
-    readonly SVG_FEBLEND_MODE_DIFFERENCE: number;
-    readonly SVG_FEBLEND_MODE_EXCLUSION: number;
-    readonly SVG_FEBLEND_MODE_HARD_LIGHT: number;
-    readonly SVG_FEBLEND_MODE_HUE: number;
-    readonly SVG_FEBLEND_MODE_LIGHTEN: number;
-    readonly SVG_FEBLEND_MODE_LUMINOSITY: number;
-    readonly SVG_FEBLEND_MODE_MULTIPLY: number;
-    readonly SVG_FEBLEND_MODE_NORMAL: number;
-    readonly SVG_FEBLEND_MODE_OVERLAY: number;
-    readonly SVG_FEBLEND_MODE_SATURATION: number;
-    readonly SVG_FEBLEND_MODE_SCREEN: number;
-    readonly SVG_FEBLEND_MODE_SOFT_LIGHT: number;
-    readonly SVG_FEBLEND_MODE_UNKNOWN: number;
-};
-
-interface SVGFEColorMatrixElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    readonly type: SVGAnimatedEnumeration;
-    readonly values: SVGAnimatedNumberList;
-    readonly SVG_FECOLORMATRIX_TYPE_HUEROTATE: number;
-    readonly SVG_FECOLORMATRIX_TYPE_LUMINANCETOALPHA: number;
-    readonly SVG_FECOLORMATRIX_TYPE_MATRIX: number;
-    readonly SVG_FECOLORMATRIX_TYPE_SATURATE: number;
-    readonly SVG_FECOLORMATRIX_TYPE_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEColorMatrixElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEColorMatrixElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEColorMatrixElement: {
-    prototype: SVGFEColorMatrixElement;
-    new(): SVGFEColorMatrixElement;
-    readonly SVG_FECOLORMATRIX_TYPE_HUEROTATE: number;
-    readonly SVG_FECOLORMATRIX_TYPE_LUMINANCETOALPHA: number;
-    readonly SVG_FECOLORMATRIX_TYPE_MATRIX: number;
-    readonly SVG_FECOLORMATRIX_TYPE_SATURATE: number;
-    readonly SVG_FECOLORMATRIX_TYPE_UNKNOWN: number;
-};
-
-interface SVGFEComponentTransferElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEComponentTransferElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEComponentTransferElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEComponentTransferElement: {
-    prototype: SVGFEComponentTransferElement;
-    new(): SVGFEComponentTransferElement;
-};
-
-interface SVGFECompositeElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    readonly in2: SVGAnimatedString;
-    readonly k1: SVGAnimatedNumber;
-    readonly k2: SVGAnimatedNumber;
-    readonly k3: SVGAnimatedNumber;
-    readonly k4: SVGAnimatedNumber;
-    readonly operator: SVGAnimatedEnumeration;
-    readonly SVG_FECOMPOSITE_OPERATOR_ARITHMETIC: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_ATOP: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_IN: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_OUT: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_OVER: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_UNKNOWN: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_XOR: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFECompositeElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFECompositeElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFECompositeElement: {
-    prototype: SVGFECompositeElement;
-    new(): SVGFECompositeElement;
-    readonly SVG_FECOMPOSITE_OPERATOR_ARITHMETIC: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_ATOP: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_IN: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_OUT: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_OVER: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_UNKNOWN: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_XOR: number;
-};
-
-interface SVGFEConvolveMatrixElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly bias: SVGAnimatedNumber;
-    readonly divisor: SVGAnimatedNumber;
-    readonly edgeMode: SVGAnimatedEnumeration;
-    readonly in1: SVGAnimatedString;
-    readonly kernelMatrix: SVGAnimatedNumberList;
-    readonly kernelUnitLengthX: SVGAnimatedNumber;
-    readonly kernelUnitLengthY: SVGAnimatedNumber;
-    readonly orderX: SVGAnimatedInteger;
-    readonly orderY: SVGAnimatedInteger;
-    readonly preserveAlpha: SVGAnimatedBoolean;
-    readonly targetX: SVGAnimatedInteger;
-    readonly targetY: SVGAnimatedInteger;
-    readonly SVG_EDGEMODE_DUPLICATE: number;
-    readonly SVG_EDGEMODE_NONE: number;
-    readonly SVG_EDGEMODE_UNKNOWN: number;
-    readonly SVG_EDGEMODE_WRAP: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEConvolveMatrixElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEConvolveMatrixElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEConvolveMatrixElement: {
-    prototype: SVGFEConvolveMatrixElement;
-    new(): SVGFEConvolveMatrixElement;
-    readonly SVG_EDGEMODE_DUPLICATE: number;
-    readonly SVG_EDGEMODE_NONE: number;
-    readonly SVG_EDGEMODE_UNKNOWN: number;
-    readonly SVG_EDGEMODE_WRAP: number;
-};
-
-interface SVGFEDiffuseLightingElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly diffuseConstant: SVGAnimatedNumber;
-    readonly in1: SVGAnimatedString;
-    readonly kernelUnitLengthX: SVGAnimatedNumber;
-    readonly kernelUnitLengthY: SVGAnimatedNumber;
-    readonly surfaceScale: SVGAnimatedNumber;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEDiffuseLightingElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEDiffuseLightingElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEDiffuseLightingElement: {
-    prototype: SVGFEDiffuseLightingElement;
-    new(): SVGFEDiffuseLightingElement;
-};
-
-interface SVGFEDisplacementMapElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    readonly in2: SVGAnimatedString;
-    readonly scale: SVGAnimatedNumber;
-    readonly xChannelSelector: SVGAnimatedEnumeration;
-    readonly yChannelSelector: SVGAnimatedEnumeration;
-    readonly SVG_CHANNEL_A: number;
-    readonly SVG_CHANNEL_B: number;
-    readonly SVG_CHANNEL_G: number;
-    readonly SVG_CHANNEL_R: number;
-    readonly SVG_CHANNEL_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEDisplacementMapElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEDisplacementMapElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEDisplacementMapElement: {
-    prototype: SVGFEDisplacementMapElement;
-    new(): SVGFEDisplacementMapElement;
-    readonly SVG_CHANNEL_A: number;
-    readonly SVG_CHANNEL_B: number;
-    readonly SVG_CHANNEL_G: number;
-    readonly SVG_CHANNEL_R: number;
-    readonly SVG_CHANNEL_UNKNOWN: number;
-};
-
-interface SVGFEDistantLightElement extends SVGElement {
-    readonly azimuth: SVGAnimatedNumber;
-    readonly elevation: SVGAnimatedNumber;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEDistantLightElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEDistantLightElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEDistantLightElement: {
-    prototype: SVGFEDistantLightElement;
-    new(): SVGFEDistantLightElement;
-};
-
-interface SVGFEFloodElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFloodElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFloodElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEFloodElement: {
-    prototype: SVGFEFloodElement;
-    new(): SVGFEFloodElement;
-};
-
-interface SVGFEFuncAElement extends SVGComponentTransferFunctionElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFuncAElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFuncAElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEFuncAElement: {
-    prototype: SVGFEFuncAElement;
-    new(): SVGFEFuncAElement;
-};
-
-interface SVGFEFuncBElement extends SVGComponentTransferFunctionElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFuncBElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFuncBElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEFuncBElement: {
-    prototype: SVGFEFuncBElement;
-    new(): SVGFEFuncBElement;
-};
-
-interface SVGFEFuncGElement extends SVGComponentTransferFunctionElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFuncGElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFuncGElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEFuncGElement: {
-    prototype: SVGFEFuncGElement;
-    new(): SVGFEFuncGElement;
-};
-
-interface SVGFEFuncRElement extends SVGComponentTransferFunctionElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFuncRElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFuncRElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEFuncRElement: {
-    prototype: SVGFEFuncRElement;
-    new(): SVGFEFuncRElement;
-};
-
-interface SVGFEGaussianBlurElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    readonly stdDeviationX: SVGAnimatedNumber;
-    readonly stdDeviationY: SVGAnimatedNumber;
-    setStdDeviation(stdDeviationX: number, stdDeviationY: number): void;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEGaussianBlurElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEGaussianBlurElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEGaussianBlurElement: {
-    prototype: SVGFEGaussianBlurElement;
-    new(): SVGFEGaussianBlurElement;
-};
-
-interface SVGFEImageElement extends SVGElement, SVGFilterPrimitiveStandardAttributes, SVGURIReference {
-    readonly preserveAspectRatio: SVGAnimatedPreserveAspectRatio;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEImageElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEImageElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEImageElement: {
-    prototype: SVGFEImageElement;
-    new(): SVGFEImageElement;
-};
-
-interface SVGFEMergeElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEMergeElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEMergeElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEMergeElement: {
-    prototype: SVGFEMergeElement;
-    new(): SVGFEMergeElement;
-};
-
-interface SVGFEMergeNodeElement extends SVGElement {
-    readonly in1: SVGAnimatedString;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEMergeNodeElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEMergeNodeElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEMergeNodeElement: {
-    prototype: SVGFEMergeNodeElement;
-    new(): SVGFEMergeNodeElement;
-};
-
-interface SVGFEMorphologyElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    readonly operator: SVGAnimatedEnumeration;
-    readonly radiusX: SVGAnimatedNumber;
-    readonly radiusY: SVGAnimatedNumber;
-    readonly SVG_MORPHOLOGY_OPERATOR_DILATE: number;
-    readonly SVG_MORPHOLOGY_OPERATOR_ERODE: number;
-    readonly SVG_MORPHOLOGY_OPERATOR_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEMorphologyElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEMorphologyElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEMorphologyElement: {
-    prototype: SVGFEMorphologyElement;
-    new(): SVGFEMorphologyElement;
-    readonly SVG_MORPHOLOGY_OPERATOR_DILATE: number;
-    readonly SVG_MORPHOLOGY_OPERATOR_ERODE: number;
-    readonly SVG_MORPHOLOGY_OPERATOR_UNKNOWN: number;
-};
-
-interface SVGFEOffsetElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly dx: SVGAnimatedNumber;
-    readonly dy: SVGAnimatedNumber;
-    readonly in1: SVGAnimatedString;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEOffsetElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEOffsetElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEOffsetElement: {
-    prototype: SVGFEOffsetElement;
-    new(): SVGFEOffsetElement;
-};
-
-interface SVGFEPointLightElement extends SVGElement {
-    readonly x: SVGAnimatedNumber;
-    readonly y: SVGAnimatedNumber;
-    readonly z: SVGAnimatedNumber;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEPointLightElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEPointLightElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEPointLightElement: {
-    prototype: SVGFEPointLightElement;
-    new(): SVGFEPointLightElement;
-};
-
-interface SVGFESpecularLightingElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    readonly kernelUnitLengthX: SVGAnimatedNumber;
-    readonly kernelUnitLengthY: SVGAnimatedNumber;
-    readonly specularConstant: SVGAnimatedNumber;
-    readonly specularExponent: SVGAnimatedNumber;
-    readonly surfaceScale: SVGAnimatedNumber;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFESpecularLightingElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFESpecularLightingElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFESpecularLightingElement: {
-    prototype: SVGFESpecularLightingElement;
-    new(): SVGFESpecularLightingElement;
-};
-
-interface SVGFESpotLightElement extends SVGElement {
-    readonly limitingConeAngle: SVGAnimatedNumber;
-    readonly pointsAtX: SVGAnimatedNumber;
-    readonly pointsAtY: SVGAnimatedNumber;
-    readonly pointsAtZ: SVGAnimatedNumber;
-    readonly specularExponent: SVGAnimatedNumber;
-    readonly x: SVGAnimatedNumber;
-    readonly y: SVGAnimatedNumber;
-    readonly z: SVGAnimatedNumber;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFESpotLightElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFESpotLightElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFESpotLightElement: {
-    prototype: SVGFESpotLightElement;
-    new(): SVGFESpotLightElement;
-};
-
-interface SVGFETileElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFETileElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFETileElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFETileElement: {
-    prototype: SVGFETileElement;
-    new(): SVGFETileElement;
-};
-
-interface SVGFETurbulenceElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly baseFrequencyX: SVGAnimatedNumber;
-    readonly baseFrequencyY: SVGAnimatedNumber;
-    readonly numOctaves: SVGAnimatedInteger;
-    readonly seed: SVGAnimatedNumber;
-    readonly stitchTiles: SVGAnimatedEnumeration;
-    readonly type: SVGAnimatedEnumeration;
-    readonly SVG_STITCHTYPE_NOSTITCH: number;
-    readonly SVG_STITCHTYPE_STITCH: number;
-    readonly SVG_STITCHTYPE_UNKNOWN: number;
-    readonly SVG_TURBULENCE_TYPE_FRACTALNOISE: number;
-    readonly SVG_TURBULENCE_TYPE_TURBULENCE: number;
-    readonly SVG_TURBULENCE_TYPE_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFETurbulenceElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFETurbulenceElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFETurbulenceElement: {
-    prototype: SVGFETurbulenceElement;
-    new(): SVGFETurbulenceElement;
-    readonly SVG_STITCHTYPE_NOSTITCH: number;
-    readonly SVG_STITCHTYPE_STITCH: number;
-    readonly SVG_STITCHTYPE_UNKNOWN: number;
-    readonly SVG_TURBULENCE_TYPE_FRACTALNOISE: number;
-    readonly SVG_TURBULENCE_TYPE_TURBULENCE: number;
-    readonly SVG_TURBULENCE_TYPE_UNKNOWN: number;
-};
-
-interface SVGFilterElement extends SVGElement, SVGUnitTypes, SVGURIReference {
-    /** @deprecated */
-    readonly filterResX: SVGAnimatedInteger;
-    /** @deprecated */
-    readonly filterResY: SVGAnimatedInteger;
-    readonly filterUnits: SVGAnimatedEnumeration;
-    readonly height: SVGAnimatedLength;
-    readonly primitiveUnits: SVGAnimatedEnumeration;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-    /** @deprecated */
-    setFilterRes(filterResX: number, filterResY: number): void;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFilterElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFilterElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFilterElement: {
-    prototype: SVGFilterElement;
-    new(): SVGFilterElement;
-};
-
-interface SVGFilterPrimitiveStandardAttributes {
-    readonly height: SVGAnimatedLength;
-    readonly result: SVGAnimatedString;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-}
-
-interface SVGFitToViewBox {
-    readonly preserveAspectRatio: SVGAnimatedPreserveAspectRatio;
-    readonly viewBox: SVGAnimatedRect;
-}
-
-interface SVGForeignObjectElement extends SVGGraphicsElement {
-    readonly height: SVGAnimatedLength;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGForeignObjectElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGForeignObjectElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGForeignObjectElement: {
-    prototype: SVGForeignObjectElement;
-    new(): SVGForeignObjectElement;
-};
-
-interface SVGGElement extends SVGGraphicsElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGGElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGGElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGGElement: {
-    prototype: SVGGElement;
-    new(): SVGGElement;
-};
-
-interface SVGGradientElement extends SVGElement, SVGUnitTypes, SVGURIReference {
-    readonly gradientTransform: SVGAnimatedTransformList;
-    readonly gradientUnits: SVGAnimatedEnumeration;
-    readonly spreadMethod: SVGAnimatedEnumeration;
-    readonly SVG_SPREADMETHOD_PAD: number;
-    readonly SVG_SPREADMETHOD_REFLECT: number;
-    readonly SVG_SPREADMETHOD_REPEAT: number;
-    readonly SVG_SPREADMETHOD_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGGradientElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGGradientElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGGradientElement: {
-    prototype: SVGGradientElement;
-    new(): SVGGradientElement;
-    readonly SVG_SPREADMETHOD_PAD: number;
-    readonly SVG_SPREADMETHOD_REFLECT: number;
-    readonly SVG_SPREADMETHOD_REPEAT: number;
-    readonly SVG_SPREADMETHOD_UNKNOWN: number;
-};
-
-interface SVGGraphicsElement extends SVGElement, SVGTests {
-    /** @deprecated */
-    readonly farthestViewportElement: SVGElement | null;
-    /** @deprecated */
-    readonly nearestViewportElement: SVGElement | null;
-    readonly transform: SVGAnimatedTransformList;
-    getBBox(): SVGRect;
-    getCTM(): SVGMatrix | null;
-    getScreenCTM(): SVGMatrix | null;
-    /** @deprecated */
-    getTransformToElement(element: SVGElement): SVGMatrix;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGGraphicsElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGGraphicsElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGGraphicsElement: {
-    prototype: SVGGraphicsElement;
-    new(): SVGGraphicsElement;
-};
-
-interface SVGImageElement extends SVGGraphicsElement, SVGURIReference {
-    readonly height: SVGAnimatedLength;
-    readonly preserveAspectRatio: SVGAnimatedPreserveAspectRatio;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGImageElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGImageElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGImageElement: {
-    prototype: SVGImageElement;
-    new(): SVGImageElement;
-};
-
-interface SVGLength {
-    readonly unitType: number;
-    value: number;
-    valueAsString: string;
-    valueInSpecifiedUnits: number;
-    convertToSpecifiedUnits(unitType: number): void;
-    newValueSpecifiedUnits(unitType: number, valueInSpecifiedUnits: number): void;
-    readonly SVG_LENGTHTYPE_CM: number;
-    readonly SVG_LENGTHTYPE_EMS: number;
-    readonly SVG_LENGTHTYPE_EXS: number;
-    readonly SVG_LENGTHTYPE_IN: number;
-    readonly SVG_LENGTHTYPE_MM: number;
-    readonly SVG_LENGTHTYPE_NUMBER: number;
-    readonly SVG_LENGTHTYPE_PC: number;
-    readonly SVG_LENGTHTYPE_PERCENTAGE: number;
-    readonly SVG_LENGTHTYPE_PT: number;
-    readonly SVG_LENGTHTYPE_PX: number;
-    readonly SVG_LENGTHTYPE_UNKNOWN: number;
-}
-
-declare var SVGLength: {
-    prototype: SVGLength;
-    new(): SVGLength;
-    readonly SVG_LENGTHTYPE_CM: number;
-    readonly SVG_LENGTHTYPE_EMS: number;
-    readonly SVG_LENGTHTYPE_EXS: number;
-    readonly SVG_LENGTHTYPE_IN: number;
-    readonly SVG_LENGTHTYPE_MM: number;
-    readonly SVG_LENGTHTYPE_NUMBER: number;
-    readonly SVG_LENGTHTYPE_PC: number;
-    readonly SVG_LENGTHTYPE_PERCENTAGE: number;
-    readonly SVG_LENGTHTYPE_PT: number;
-    readonly SVG_LENGTHTYPE_PX: number;
-    readonly SVG_LENGTHTYPE_UNKNOWN: number;
-};
-
-interface SVGLengthList {
-    readonly numberOfItems: number;
-    appendItem(newItem: SVGLength): SVGLength;
-    clear(): void;
-    getItem(index: number): SVGLength;
-    initialize(newItem: SVGLength): SVGLength;
-    insertItemBefore(newItem: SVGLength, index: number): SVGLength;
-    removeItem(index: number): SVGLength;
-    replaceItem(newItem: SVGLength, index: number): SVGLength;
-}
-
-declare var SVGLengthList: {
-    prototype: SVGLengthList;
-    new(): SVGLengthList;
-};
-
-interface SVGLineElement extends SVGGraphicsElement {
-    readonly x1: SVGAnimatedLength;
-    readonly x2: SVGAnimatedLength;
-    readonly y1: SVGAnimatedLength;
-    readonly y2: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGLineElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGLineElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGLineElement: {
-    prototype: SVGLineElement;
-    new(): SVGLineElement;
-};
-
-interface SVGLinearGradientElement extends SVGGradientElement {
-    readonly x1: SVGAnimatedLength;
-    readonly x2: SVGAnimatedLength;
-    readonly y1: SVGAnimatedLength;
-    readonly y2: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGLinearGradientElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGLinearGradientElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGLinearGradientElement: {
-    prototype: SVGLinearGradientElement;
-    new(): SVGLinearGradientElement;
-};
-
-interface SVGMarkerElement extends SVGElement, SVGFitToViewBox {
-    readonly markerHeight: SVGAnimatedLength;
-    readonly markerUnits: SVGAnimatedEnumeration;
-    readonly markerWidth: SVGAnimatedLength;
-    readonly orientAngle: SVGAnimatedAngle;
-    readonly orientType: SVGAnimatedEnumeration;
-    readonly refX: SVGAnimatedLength;
-    readonly refY: SVGAnimatedLength;
-    setOrientToAngle(angle: SVGAngle): void;
-    setOrientToAuto(): void;
-    readonly SVG_MARKERUNITS_STROKEWIDTH: number;
-    readonly SVG_MARKERUNITS_UNKNOWN: number;
-    readonly SVG_MARKERUNITS_USERSPACEONUSE: number;
-    readonly SVG_MARKER_ORIENT_ANGLE: number;
-    readonly SVG_MARKER_ORIENT_AUTO: number;
-    readonly SVG_MARKER_ORIENT_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGMarkerElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGMarkerElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGMarkerElement: {
-    prototype: SVGMarkerElement;
-    new(): SVGMarkerElement;
-    readonly SVG_MARKERUNITS_STROKEWIDTH: number;
-    readonly SVG_MARKERUNITS_UNKNOWN: number;
-    readonly SVG_MARKERUNITS_USERSPACEONUSE: number;
-    readonly SVG_MARKER_ORIENT_ANGLE: number;
-    readonly SVG_MARKER_ORIENT_AUTO: number;
-    readonly SVG_MARKER_ORIENT_UNKNOWN: number;
-};
-
-interface SVGMaskElement extends SVGElement, SVGTests, SVGUnitTypes {
-    readonly height: SVGAnimatedLength;
-    readonly maskContentUnits: SVGAnimatedEnumeration;
-    readonly maskUnits: SVGAnimatedEnumeration;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGMaskElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGMaskElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGMaskElement: {
-    prototype: SVGMaskElement;
-    new(): SVGMaskElement;
-};
-
-interface SVGMatrix {
-    a: number;
-    b: number;
-    c: number;
-    d: number;
-    e: number;
-    f: number;
-    flipX(): SVGMatrix;
-    flipY(): SVGMatrix;
-    inverse(): SVGMatrix;
-    multiply(secondMatrix: SVGMatrix): SVGMatrix;
-    rotate(angle: number): SVGMatrix;
-    rotateFromVector(x: number, y: number): SVGMatrix;
-    scale(scaleFactor: number): SVGMatrix;
-    scaleNonUniform(scaleFactorX: number, scaleFactorY: number): SVGMatrix;
-    skewX(angle: number): SVGMatrix;
-    skewY(angle: number): SVGMatrix;
-    translate(x: number, y: number): SVGMatrix;
-}
-
-declare var SVGMatrix: {
-    prototype: SVGMatrix;
-    new(): SVGMatrix;
-};
-
-interface SVGMetadataElement extends SVGElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGMetadataElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGMetadataElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGMetadataElement: {
-    prototype: SVGMetadataElement;
-    new(): SVGMetadataElement;
-};
-
-interface SVGNumber {
-    value: number;
-}
-
-declare var SVGNumber: {
-    prototype: SVGNumber;
-    new(): SVGNumber;
-};
-
-interface SVGNumberList {
-    readonly numberOfItems: number;
-    appendItem(newItem: SVGNumber): SVGNumber;
-    clear(): void;
-    getItem(index: number): SVGNumber;
-    initialize(newItem: SVGNumber): SVGNumber;
-    insertItemBefore(newItem: SVGNumber, index: number): SVGNumber;
-    removeItem(index: number): SVGNumber;
-    replaceItem(newItem: SVGNumber, index: number): SVGNumber;
-}
-
-declare var SVGNumberList: {
-    prototype: SVGNumberList;
-    new(): SVGNumberList;
-};
-
-interface SVGPathElement extends SVGGraphicsElement {
-    /** @deprecated */
-    readonly pathSegList: SVGPathSegList;
-    /** @deprecated */
-    createSVGPathSegArcAbs(x: number, y: number, r1: number, r2: number, angle: number, largeArcFlag: boolean, sweepFlag: boolean): SVGPathSegArcAbs;
-    /** @deprecated */
-    createSVGPathSegArcRel(x: number, y: number, r1: number, r2: number, angle: number, largeArcFlag: boolean, sweepFlag: boolean): SVGPathSegArcRel;
-    /** @deprecated */
-    createSVGPathSegClosePath(): SVGPathSegClosePath;
-    /** @deprecated */
-    createSVGPathSegCurvetoCubicAbs(x: number, y: number, x1: number, y1: number, x2: number, y2: number): SVGPathSegCurvetoCubicAbs;
-    /** @deprecated */
-    createSVGPathSegCurvetoCubicRel(x: number, y: number, x1: number, y1: number, x2: number, y2: number): SVGPathSegCurvetoCubicRel;
-    /** @deprecated */
-    createSVGPathSegCurvetoCubicSmoothAbs(x: number, y: number, x2: number, y2: number): SVGPathSegCurvetoCubicSmoothAbs;
-    /** @deprecated */
-    createSVGPathSegCurvetoCubicSmoothRel(x: number, y: number, x2: number, y2: number): SVGPathSegCurvetoCubicSmoothRel;
-    /** @deprecated */
-    createSVGPathSegCurvetoQuadraticAbs(x: number, y: number, x1: number, y1: number): SVGPathSegCurvetoQuadraticAbs;
-    /** @deprecated */
-    createSVGPathSegCurvetoQuadraticRel(x: number, y: number, x1: number, y1: number): SVGPathSegCurvetoQuadraticRel;
-    /** @deprecated */
-    createSVGPathSegCurvetoQuadraticSmoothAbs(x: number, y: number): SVGPathSegCurvetoQuadraticSmoothAbs;
-    /** @deprecated */
-    createSVGPathSegCurvetoQuadraticSmoothRel(x: number, y: number): SVGPathSegCurvetoQuadraticSmoothRel;
-    /** @deprecated */
-    createSVGPathSegLinetoAbs(x: number, y: number): SVGPathSegLinetoAbs;
-    /** @deprecated */
-    createSVGPathSegLinetoHorizontalAbs(x: number): SVGPathSegLinetoHorizontalAbs;
-    /** @deprecated */
-    createSVGPathSegLinetoHorizontalRel(x: number): SVGPathSegLinetoHorizontalRel;
-    /** @deprecated */
-    createSVGPathSegLinetoRel(x: number, y: number): SVGPathSegLinetoRel;
-    /** @deprecated */
-    createSVGPathSegLinetoVerticalAbs(y: number): SVGPathSegLinetoVerticalAbs;
-    /** @deprecated */
-    createSVGPathSegLinetoVerticalRel(y: number): SVGPathSegLinetoVerticalRel;
-    /** @deprecated */
-    createSVGPathSegMovetoAbs(x: number, y: number): SVGPathSegMovetoAbs;
-    /** @deprecated */
-    createSVGPathSegMovetoRel(x: number, y: number): SVGPathSegMovetoRel;
-    /** @deprecated */
-    getPathSegAtLength(distance: number): number;
-    getPointAtLength(distance: number): SVGPoint;
-    getTotalLength(): number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGPathElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGPathElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGPathElement: {
-    prototype: SVGPathElement;
-    new(): SVGPathElement;
-};
-
-interface SVGPathSeg {
-    readonly pathSegType: number;
-    readonly pathSegTypeAsLetter: string;
-    readonly PATHSEG_ARC_ABS: number;
-    readonly PATHSEG_ARC_REL: number;
-    readonly PATHSEG_CLOSEPATH: number;
-    readonly PATHSEG_CURVETO_CUBIC_ABS: number;
-    readonly PATHSEG_CURVETO_CUBIC_REL: number;
-    readonly PATHSEG_CURVETO_CUBIC_SMOOTH_ABS: number;
-    readonly PATHSEG_CURVETO_CUBIC_SMOOTH_REL: number;
-    readonly PATHSEG_CURVETO_QUADRATIC_ABS: number;
-    readonly PATHSEG_CURVETO_QUADRATIC_REL: number;
-    readonly PATHSEG_CURVETO_QUADRATIC_SMOOTH_ABS: number;
-    readonly PATHSEG_CURVETO_QUADRATIC_SMOOTH_REL: number;
-    readonly PATHSEG_LINETO_ABS: number;
-    readonly PATHSEG_LINETO_HORIZONTAL_ABS: number;
-    readonly PATHSEG_LINETO_HORIZONTAL_REL: number;
-    readonly PATHSEG_LINETO_REL: number;
-    readonly PATHSEG_LINETO_VERTICAL_ABS: number;
-    readonly PATHSEG_LINETO_VERTICAL_REL: number;
-    readonly PATHSEG_MOVETO_ABS: number;
-    readonly PATHSEG_MOVETO_REL: number;
-    readonly PATHSEG_UNKNOWN: number;
-}
-
-declare var SVGPathSeg: {
-    prototype: SVGPathSeg;
-    new(): SVGPathSeg;
-    readonly PATHSEG_ARC_ABS: number;
-    readonly PATHSEG_ARC_REL: number;
-    readonly PATHSEG_CLOSEPATH: number;
-    readonly PATHSEG_CURVETO_CUBIC_ABS: number;
-    readonly PATHSEG_CURVETO_CUBIC_REL: number;
-    readonly PATHSEG_CURVETO_CUBIC_SMOOTH_ABS: number;
-    readonly PATHSEG_CURVETO_CUBIC_SMOOTH_REL: number;
-    readonly PATHSEG_CURVETO_QUADRATIC_ABS: number;
-    readonly PATHSEG_CURVETO_QUADRATIC_REL: number;
-    readonly PATHSEG_CURVETO_QUADRATIC_SMOOTH_ABS: number;
-    readonly PATHSEG_CURVETO_QUADRATIC_SMOOTH_REL: number;
-    readonly PATHSEG_LINETO_ABS: number;
-    readonly PATHSEG_LINETO_HORIZONTAL_ABS: number;
-    readonly PATHSEG_LINETO_HORIZONTAL_REL: number;
-    readonly PATHSEG_LINETO_REL: number;
-    readonly PATHSEG_LINETO_VERTICAL_ABS: number;
-    readonly PATHSEG_LINETO_VERTICAL_REL: number;
-    readonly PATHSEG_MOVETO_ABS: number;
-    readonly PATHSEG_MOVETO_REL: number;
-    readonly PATHSEG_UNKNOWN: number;
-};
-
-interface SVGPathSegArcAbs extends SVGPathSeg {
-    angle: number;
-    largeArcFlag: boolean;
-    r1: number;
-    r2: number;
-    sweepFlag: boolean;
-    x: number;
-    y: number;
-}
-
-declare var SVGPathSegArcAbs: {
-    prototype: SVGPathSegArcAbs;
-    new(): SVGPathSegArcAbs;
-};
-
-interface SVGPathSegArcRel extends SVGPathSeg {
-    angle: number;
-    largeArcFlag: boolean;
-    r1: number;
-    r2: number;
-    sweepFlag: boolean;
-    x: number;
-    y: number;
-}
-
-declare var SVGPathSegArcRel: {
-    prototype: SVGPathSegArcRel;
-    new(): SVGPathSegArcRel;
-};
-
-interface SVGPathSegClosePath extends SVGPathSeg {
-}
-
-declare var SVGPathSegClosePath: {
-    prototype: SVGPathSegClosePath;
-    new(): SVGPathSegClosePath;
-};
-
-interface SVGPathSegCurvetoCubicAbs extends SVGPathSeg {
-    x: number;
-    x1: number;
-    x2: number;
-    y: number;
-    y1: number;
-    y2: number;
-}
-
-declare var SVGPathSegCurvetoCubicAbs: {
-    prototype: SVGPathSegCurvetoCubicAbs;
-    new(): SVGPathSegCurvetoCubicAbs;
-};
-
-interface SVGPathSegCurvetoCubicRel extends SVGPathSeg {
-    x: number;
-    x1: number;
-    x2: number;
-    y: number;
-    y1: number;
-    y2: number;
-}
-
-declare var SVGPathSegCurvetoCubicRel: {
-    prototype: SVGPathSegCurvetoCubicRel;
-    new(): SVGPathSegCurvetoCubicRel;
-};
-
-interface SVGPathSegCurvetoCubicSmoothAbs extends SVGPathSeg {
-    x: number;
-    x2: number;
-    y: number;
-    y2: number;
-}
-
-declare var SVGPathSegCurvetoCubicSmoothAbs: {
-    prototype: SVGPathSegCurvetoCubicSmoothAbs;
-    new(): SVGPathSegCurvetoCubicSmoothAbs;
-};
-
-interface SVGPathSegCurvetoCubicSmoothRel extends SVGPathSeg {
-    x: number;
-    x2: number;
-    y: number;
-    y2: number;
-}
-
-declare var SVGPathSegCurvetoCubicSmoothRel: {
-    prototype: SVGPathSegCurvetoCubicSmoothRel;
-    new(): SVGPathSegCurvetoCubicSmoothRel;
-};
-
-interface SVGPathSegCurvetoQuadraticAbs extends SVGPathSeg {
-    x: number;
-    x1: number;
-    y: number;
-    y1: number;
-}
-
-declare var SVGPathSegCurvetoQuadraticAbs: {
-    prototype: SVGPathSegCurvetoQuadraticAbs;
-    new(): SVGPathSegCurvetoQuadraticAbs;
-};
-
-interface SVGPathSegCurvetoQuadraticRel extends SVGPathSeg {
-    x: number;
-    x1: number;
-    y: number;
-    y1: number;
-}
-
-declare var SVGPathSegCurvetoQuadraticRel: {
-    prototype: SVGPathSegCurvetoQuadraticRel;
-    new(): SVGPathSegCurvetoQuadraticRel;
-};
-
-interface SVGPathSegCurvetoQuadraticSmoothAbs extends SVGPathSeg {
-    x: number;
-    y: number;
-}
-
-declare var SVGPathSegCurvetoQuadraticSmoothAbs: {
-    prototype: SVGPathSegCurvetoQuadraticSmoothAbs;
-    new(): SVGPathSegCurvetoQuadraticSmoothAbs;
-};
-
-interface SVGPathSegCurvetoQuadraticSmoothRel extends SVGPathSeg {
-    x: number;
-    y: number;
-}
-
-declare var SVGPathSegCurvetoQuadraticSmoothRel: {
-    prototype: SVGPathSegCurvetoQuadraticSmoothRel;
-    new(): SVGPathSegCurvetoQuadraticSmoothRel;
-};
-
-interface SVGPathSegLinetoAbs extends SVGPathSeg {
-    x: number;
-    y: number;
-}
-
-declare var SVGPathSegLinetoAbs: {
-    prototype: SVGPathSegLinetoAbs;
-    new(): SVGPathSegLinetoAbs;
-};
-
-interface SVGPathSegLinetoHorizontalAbs extends SVGPathSeg {
-    x: number;
-}
-
-declare var SVGPathSegLinetoHorizontalAbs: {
-    prototype: SVGPathSegLinetoHorizontalAbs;
-    new(): SVGPathSegLinetoHorizontalAbs;
-};
-
-interface SVGPathSegLinetoHorizontalRel extends SVGPathSeg {
-    x: number;
-}
-
-declare var SVGPathSegLinetoHorizontalRel: {
-    prototype: SVGPathSegLinetoHorizontalRel;
-    new(): SVGPathSegLinetoHorizontalRel;
-};
-
-interface SVGPathSegLinetoRel extends SVGPathSeg {
-    x: number;
-    y: number;
-}
-
-declare var SVGPathSegLinetoRel: {
-    prototype: SVGPathSegLinetoRel;
-    new(): SVGPathSegLinetoRel;
-};
-
-interface SVGPathSegLinetoVerticalAbs extends SVGPathSeg {
-    y: number;
-}
-
-declare var SVGPathSegLinetoVerticalAbs: {
-    prototype: SVGPathSegLinetoVerticalAbs;
-    new(): SVGPathSegLinetoVerticalAbs;
-};
-
-interface SVGPathSegLinetoVerticalRel extends SVGPathSeg {
-    y: number;
-}
-
-declare var SVGPathSegLinetoVerticalRel: {
-    prototype: SVGPathSegLinetoVerticalRel;
-    new(): SVGPathSegLinetoVerticalRel;
-};
-
-interface SVGPathSegList {
-    readonly numberOfItems: number;
-    appendItem(newItem: SVGPathSeg): SVGPathSeg;
-    clear(): void;
-    getItem(index: number): SVGPathSeg;
-    initialize(newItem: SVGPathSeg): SVGPathSeg;
-    insertItemBefore(newItem: SVGPathSeg, index: number): SVGPathSeg;
-    removeItem(index: number): SVGPathSeg;
-    replaceItem(newItem: SVGPathSeg, index: number): SVGPathSeg;
-}
-
-declare var SVGPathSegList: {
-    prototype: SVGPathSegList;
-    new(): SVGPathSegList;
-};
-
-interface SVGPathSegMovetoAbs extends SVGPathSeg {
-    x: number;
-    y: number;
-}
-
-declare var SVGPathSegMovetoAbs: {
-    prototype: SVGPathSegMovetoAbs;
-    new(): SVGPathSegMovetoAbs;
-};
-
-interface SVGPathSegMovetoRel extends SVGPathSeg {
-    x: number;
-    y: number;
-}
-
-declare var SVGPathSegMovetoRel: {
-    prototype: SVGPathSegMovetoRel;
-    new(): SVGPathSegMovetoRel;
-};
-
-interface SVGPatternElement extends SVGElement, SVGTests, SVGUnitTypes, SVGFitToViewBox, SVGURIReference {
-    readonly height: SVGAnimatedLength;
-    readonly patternContentUnits: SVGAnimatedEnumeration;
-    readonly patternTransform: SVGAnimatedTransformList;
-    readonly patternUnits: SVGAnimatedEnumeration;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGPatternElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGPatternElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGPatternElement: {
-    prototype: SVGPatternElement;
-    new(): SVGPatternElement;
-};
-
-interface SVGPoint {
-    x: number;
-    y: number;
-    matrixTransform(matrix: SVGMatrix): SVGPoint;
-}
-
-declare var SVGPoint: {
-    prototype: SVGPoint;
-    new(): SVGPoint;
-};
-
-interface SVGPointList {
-    readonly numberOfItems: number;
-    appendItem(newItem: SVGPoint): SVGPoint;
-    clear(): void;
-    getItem(index: number): SVGPoint;
-    initialize(newItem: SVGPoint): SVGPoint;
-    insertItemBefore(newItem: SVGPoint, index: number): SVGPoint;
-    removeItem(index: number): SVGPoint;
-    replaceItem(newItem: SVGPoint, index: number): SVGPoint;
-}
-
-declare var SVGPointList: {
-    prototype: SVGPointList;
-    new(): SVGPointList;
-};
-
-interface SVGPolygonElement extends SVGGraphicsElement, SVGAnimatedPoints {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGPolygonElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGPolygonElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGPolygonElement: {
-    prototype: SVGPolygonElement;
-    new(): SVGPolygonElement;
-};
-
-interface SVGPolylineElement extends SVGGraphicsElement, SVGAnimatedPoints {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGPolylineElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGPolylineElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGPolylineElement: {
-    prototype: SVGPolylineElement;
-    new(): SVGPolylineElement;
-};
-
-interface SVGPreserveAspectRatio {
-    align: number;
-    meetOrSlice: number;
-    readonly SVG_MEETORSLICE_MEET: number;
-    readonly SVG_MEETORSLICE_SLICE: number;
-    readonly SVG_MEETORSLICE_UNKNOWN: number;
-    readonly SVG_PRESERVEASPECTRATIO_NONE: number;
-    readonly SVG_PRESERVEASPECTRATIO_UNKNOWN: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMAXYMAX: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMAXYMID: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMAXYMIN: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMIDYMAX: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMIDYMID: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMIDYMIN: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMINYMAX: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMINYMID: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMINYMIN: number;
-}
-
-declare var SVGPreserveAspectRatio: {
-    prototype: SVGPreserveAspectRatio;
-    new(): SVGPreserveAspectRatio;
-    readonly SVG_MEETORSLICE_MEET: number;
-    readonly SVG_MEETORSLICE_SLICE: number;
-    readonly SVG_MEETORSLICE_UNKNOWN: number;
-    readonly SVG_PRESERVEASPECTRATIO_NONE: number;
-    readonly SVG_PRESERVEASPECTRATIO_UNKNOWN: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMAXYMAX: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMAXYMID: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMAXYMIN: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMIDYMAX: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMIDYMID: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMIDYMIN: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMINYMAX: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMINYMID: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMINYMIN: number;
-};
-
-interface SVGRadialGradientElement extends SVGGradientElement {
-    readonly cx: SVGAnimatedLength;
-    readonly cy: SVGAnimatedLength;
-    readonly fx: SVGAnimatedLength;
-    readonly fy: SVGAnimatedLength;
-    readonly r: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGRadialGradientElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGRadialGradientElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGRadialGradientElement: {
-    prototype: SVGRadialGradientElement;
-    new(): SVGRadialGradientElement;
-};
-
-interface SVGRect {
-    height: number;
-    width: number;
-    x: number;
-    y: number;
-}
-
-declare var SVGRect: {
-    prototype: SVGRect;
-    new(): SVGRect;
-};
-
-interface SVGRectElement extends SVGGraphicsElement {
-    readonly height: SVGAnimatedLength;
-    readonly rx: SVGAnimatedLength;
-    readonly ry: SVGAnimatedLength;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGRectElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGRectElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGRectElement: {
-    prototype: SVGRectElement;
-    new(): SVGRectElement;
-};
-
-interface SVGSVGElementEventMap extends SVGElementEventMap {
-    "SVGAbort": Event;
-    "SVGError": Event;
-    "resize": UIEvent;
-    "scroll": UIEvent;
-    "SVGUnload": Event;
-    "SVGZoom": SVGZoomEvent;
-}
-
-interface SVGSVGElement extends SVGGraphicsElement, DocumentEvent, SVGFitToViewBox, SVGZoomAndPan {
-    /** @deprecated */
-    contentScriptType: string;
-    /** @deprecated */
-    contentStyleType: string;
-    currentScale: number;
-    readonly currentTranslate: SVGPoint;
-    readonly height: SVGAnimatedLength;
-    onabort: ((this: SVGSVGElement, ev: Event) => any) | null;
-    onerror: ((this: SVGSVGElement, ev: Event) => any) | null;
-    onresize: ((this: SVGSVGElement, ev: UIEvent) => any) | null;
-    onscroll: ((this: SVGSVGElement, ev: UIEvent) => any) | null;
-    onunload: ((this: SVGSVGElement, ev: Event) => any) | null;
-    onzoom: ((this: SVGSVGElement, ev: SVGZoomEvent) => any) | null;
-    /** @deprecated */
-    readonly pixelUnitToMillimeterX: number;
-    /** @deprecated */
-    readonly pixelUnitToMillimeterY: number;
-    /** @deprecated */
-    readonly screenPixelToMillimeterX: number;
-    /** @deprecated */
-    readonly screenPixelToMillimeterY: number;
-    /** @deprecated */
-    readonly viewport: SVGRect;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-    checkEnclosure(element: SVGElement, rect: SVGRect): boolean;
-    checkIntersection(element: SVGElement, rect: SVGRect): boolean;
-    createSVGAngle(): SVGAngle;
-    createSVGLength(): SVGLength;
-    createSVGMatrix(): SVGMatrix;
-    createSVGNumber(): SVGNumber;
-    createSVGPoint(): SVGPoint;
-    createSVGRect(): SVGRect;
-    createSVGTransform(): SVGTransform;
-    createSVGTransformFromMatrix(matrix: SVGMatrix): SVGTransform;
-    deselectAll(): void;
-    /** @deprecated */
-    forceRedraw(): void;
-    getComputedStyle(elt: Element, pseudoElt?: string | null): CSSStyleDeclaration;
-    /** @deprecated */
-    getCurrentTime(): number;
-    getElementById(elementId: string): Element;
-    getEnclosureList(rect: SVGRect, referenceElement: SVGElement): NodeListOf<SVGCircleElement | SVGEllipseElement | SVGImageElement | SVGLineElement | SVGPathElement | SVGPolygonElement | SVGPolylineElement | SVGRectElement | SVGTextElement | SVGUseElement>;
-    getIntersectionList(rect: SVGRect, referenceElement: SVGElement): NodeListOf<SVGCircleElement | SVGEllipseElement | SVGImageElement | SVGLineElement | SVGPathElement | SVGPolygonElement | SVGPolylineElement | SVGRectElement | SVGTextElement | SVGUseElement>;
-    /** @deprecated */
-    pauseAnimations(): void;
-    /** @deprecated */
-    setCurrentTime(seconds: number): void;
-    /** @deprecated */
-    suspendRedraw(maxWaitMilliseconds: number): number;
-    /** @deprecated */
-    unpauseAnimations(): void;
-    /** @deprecated */
-    unsuspendRedraw(suspendHandleID: number): void;
-    /** @deprecated */
-    unsuspendRedrawAll(): void;
-    addEventListener<K extends keyof SVGSVGElementEventMap>(type: K, listener: (this: SVGSVGElement, ev: SVGSVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGSVGElementEventMap>(type: K, listener: (this: SVGSVGElement, ev: SVGSVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGSVGElement: {
-    prototype: SVGSVGElement;
-    new(): SVGSVGElement;
-};
-
-interface SVGScriptElement extends SVGElement, SVGURIReference {
-    type: string;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGScriptElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGScriptElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGScriptElement: {
-    prototype: SVGScriptElement;
-    new(): SVGScriptElement;
-};
-
-interface SVGStopElement extends SVGElement {
-    readonly offset: SVGAnimatedNumber;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGStopElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGStopElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGStopElement: {
-    prototype: SVGStopElement;
-    new(): SVGStopElement;
-};
-
-interface SVGStringList {
-    readonly numberOfItems: number;
-    appendItem(newItem: string): string;
-    clear(): void;
-    getItem(index: number): string;
-    initialize(newItem: string): string;
-    insertItemBefore(newItem: string, index: number): string;
-    removeItem(index: number): string;
-    replaceItem(newItem: string, index: number): string;
-}
-
-declare var SVGStringList: {
-    prototype: SVGStringList;
-    new(): SVGStringList;
-};
-
-interface SVGStylable {
-    className: any;
-}
-
-declare var SVGStylable: {
-    prototype: SVGStylable;
-    new(): SVGStylable;
-};
-
-interface SVGStyleElement extends SVGElement {
-    disabled: boolean;
-    media: string;
-    title: string;
-    type: string;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGStyleElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGStyleElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGStyleElement: {
-    prototype: SVGStyleElement;
-    new(): SVGStyleElement;
-};
-
-interface SVGSwitchElement extends SVGGraphicsElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGSwitchElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGSwitchElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGSwitchElement: {
-    prototype: SVGSwitchElement;
-    new(): SVGSwitchElement;
-};
-
-interface SVGSymbolElement extends SVGElement, SVGFitToViewBox {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGSymbolElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGSymbolElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGSymbolElement: {
-    prototype: SVGSymbolElement;
-    new(): SVGSymbolElement;
-};
-
-interface SVGTSpanElement extends SVGTextPositioningElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTSpanElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTSpanElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGTSpanElement: {
-    prototype: SVGTSpanElement;
-    new(): SVGTSpanElement;
-};
-
-interface SVGTests {
-    readonly requiredExtensions: SVGStringList;
-    /** @deprecated */
-    readonly requiredFeatures: SVGStringList;
-    readonly systemLanguage: SVGStringList;
-    /** @deprecated */
-    hasExtension(extension: string): boolean;
-}
-
-interface SVGTextContentElement extends SVGGraphicsElement {
-    readonly lengthAdjust: SVGAnimatedEnumeration;
-    readonly textLength: SVGAnimatedLength;
-    getCharNumAtPosition(point: SVGPoint): number;
-    getComputedTextLength(): number;
-    getEndPositionOfChar(charnum: number): SVGPoint;
-    getExtentOfChar(charnum: number): SVGRect;
-    getNumberOfChars(): number;
-    getRotationOfChar(charnum: number): number;
-    getStartPositionOfChar(charnum: number): SVGPoint;
-    getSubStringLength(charnum: number, nchars: number): number;
-    selectSubString(charnum: number, nchars: number): void;
-    readonly LENGTHADJUST_SPACING: number;
-    readonly LENGTHADJUST_SPACINGANDGLYPHS: number;
-    readonly LENGTHADJUST_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTextContentElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTextContentElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGTextContentElement: {
-    prototype: SVGTextContentElement;
-    new(): SVGTextContentElement;
-    readonly LENGTHADJUST_SPACING: number;
-    readonly LENGTHADJUST_SPACINGANDGLYPHS: number;
-    readonly LENGTHADJUST_UNKNOWN: number;
-};
-
-interface SVGTextElement extends SVGTextPositioningElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTextElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTextElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGTextElement: {
-    prototype: SVGTextElement;
-    new(): SVGTextElement;
-};
-
-interface SVGTextPathElement extends SVGTextContentElement, SVGURIReference {
-    readonly method: SVGAnimatedEnumeration;
-    readonly spacing: SVGAnimatedEnumeration;
-    readonly startOffset: SVGAnimatedLength;
-    readonly TEXTPATH_METHODTYPE_ALIGN: number;
-    readonly TEXTPATH_METHODTYPE_STRETCH: number;
-    readonly TEXTPATH_METHODTYPE_UNKNOWN: number;
-    readonly TEXTPATH_SPACINGTYPE_AUTO: number;
-    readonly TEXTPATH_SPACINGTYPE_EXACT: number;
-    readonly TEXTPATH_SPACINGTYPE_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTextPathElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTextPathElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGTextPathElement: {
-    prototype: SVGTextPathElement;
-    new(): SVGTextPathElement;
-    readonly TEXTPATH_METHODTYPE_ALIGN: number;
-    readonly TEXTPATH_METHODTYPE_STRETCH: number;
-    readonly TEXTPATH_METHODTYPE_UNKNOWN: number;
-    readonly TEXTPATH_SPACINGTYPE_AUTO: number;
-    readonly TEXTPATH_SPACINGTYPE_EXACT: number;
-    readonly TEXTPATH_SPACINGTYPE_UNKNOWN: number;
-};
-
-interface SVGTextPositioningElement extends SVGTextContentElement {
-    readonly dx: SVGAnimatedLengthList;
-    readonly dy: SVGAnimatedLengthList;
-    readonly rotate: SVGAnimatedNumberList;
-    readonly x: SVGAnimatedLengthList;
-    readonly y: SVGAnimatedLengthList;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTextPositioningElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTextPositioningElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGTextPositioningElement: {
-    prototype: SVGTextPositioningElement;
-    new(): SVGTextPositioningElement;
-};
-
-interface SVGTitleElement extends SVGElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTitleElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTitleElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGTitleElement: {
-    prototype: SVGTitleElement;
-    new(): SVGTitleElement;
-};
-
-interface SVGTransform {
-    readonly angle: number;
-    readonly matrix: SVGMatrix;
-    readonly type: number;
-    setMatrix(matrix: SVGMatrix): void;
-    setRotate(angle: number, cx: number, cy: number): void;
-    setScale(sx: number, sy: number): void;
-    setSkewX(angle: number): void;
-    setSkewY(angle: number): void;
-    setTranslate(tx: number, ty: number): void;
-    readonly SVG_TRANSFORM_MATRIX: number;
-    readonly SVG_TRANSFORM_ROTATE: number;
-    readonly SVG_TRANSFORM_SCALE: number;
-    readonly SVG_TRANSFORM_SKEWX: number;
-    readonly SVG_TRANSFORM_SKEWY: number;
-    readonly SVG_TRANSFORM_TRANSLATE: number;
-    readonly SVG_TRANSFORM_UNKNOWN: number;
-}
-
-declare var SVGTransform: {
-    prototype: SVGTransform;
-    new(): SVGTransform;
-    readonly SVG_TRANSFORM_MATRIX: number;
-    readonly SVG_TRANSFORM_ROTATE: number;
-    readonly SVG_TRANSFORM_SCALE: number;
-    readonly SVG_TRANSFORM_SKEWX: number;
-    readonly SVG_TRANSFORM_SKEWY: number;
-    readonly SVG_TRANSFORM_TRANSLATE: number;
-    readonly SVG_TRANSFORM_UNKNOWN: number;
-};
-
-interface SVGTransformList {
-    readonly numberOfItems: number;
-    appendItem(newItem: SVGTransform): SVGTransform;
-    clear(): void;
-    consolidate(): SVGTransform;
-    createSVGTransformFromMatrix(matrix: SVGMatrix): SVGTransform;
-    getItem(index: number): SVGTransform;
-    initialize(newItem: SVGTransform): SVGTransform;
-    insertItemBefore(newItem: SVGTransform, index: number): SVGTransform;
-    removeItem(index: number): SVGTransform;
-    replaceItem(newItem: SVGTransform, index: number): SVGTransform;
-}
-
-declare var SVGTransformList: {
-    prototype: SVGTransformList;
-    new(): SVGTransformList;
-};
-
-interface SVGURIReference {
-    readonly href: SVGAnimatedString;
-}
-
-interface SVGUnitTypes {
-    readonly SVG_UNIT_TYPE_OBJECTBOUNDINGBOX: number;
-    readonly SVG_UNIT_TYPE_UNKNOWN: number;
-    readonly SVG_UNIT_TYPE_USERSPACEONUSE: number;
-}
-declare var SVGUnitTypes: SVGUnitTypes;
-
-interface SVGUseElement extends SVGGraphicsElement, SVGURIReference {
-    readonly animatedInstanceRoot: SVGElementInstance | null;
-    readonly height: SVGAnimatedLength;
-    readonly instanceRoot: SVGElementInstance | null;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGUseElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGUseElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGUseElement: {
-    prototype: SVGUseElement;
-    new(): SVGUseElement;
-};
-
-interface SVGViewElement extends SVGElement, SVGFitToViewBox, SVGZoomAndPan {
-    /** @deprecated */
-    readonly viewTarget: SVGStringList;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGViewElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGViewElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGViewElement: {
-    prototype: SVGViewElement;
-    new(): SVGViewElement;
-};
-
-interface SVGZoomAndPan {
-    readonly zoomAndPan: number;
-}
-
-declare var SVGZoomAndPan: {
-    readonly SVG_ZOOMANDPAN_DISABLE: number;
-    readonly SVG_ZOOMANDPAN_MAGNIFY: number;
-    readonly SVG_ZOOMANDPAN_UNKNOWN: number;
-};
-
-interface SVGZoomEvent extends UIEvent {
-    readonly newScale: number;
-    readonly newTranslate: SVGPoint;
-    readonly previousScale: number;
-    readonly previousTranslate: SVGPoint;
-    readonly zoomRectScreen: SVGRect;
-}
-
-declare var SVGZoomEvent: {
-    prototype: SVGZoomEvent;
-    new(): SVGZoomEvent;
-};
-
-interface ScopedCredential {
-    readonly id: ArrayBuffer;
-    readonly type: ScopedCredentialType;
-}
-
-declare var ScopedCredential: {
-    prototype: ScopedCredential;
-    new(): ScopedCredential;
-};
-
-interface ScopedCredentialInfo {
-    readonly credential: ScopedCredential;
-    readonly publicKey: CryptoKey;
-}
-
-declare var ScopedCredentialInfo: {
-    prototype: ScopedCredentialInfo;
-    new(): ScopedCredentialInfo;
-};
-
-interface ScreenEventMap {
-    "MSOrientationChange": Event;
-}
-
-interface Screen extends EventTarget {
-    readonly availHeight: number;
-    readonly availWidth: number;
-    /** @deprecated */
-    bufferDepth: number;
-    readonly colorDepth: number;
-    readonly deviceXDPI: number;
-    readonly deviceYDPI: number;
-    readonly fontSmoothingEnabled: boolean;
-    readonly height: number;
-    readonly logicalXDPI: number;
-    readonly logicalYDPI: number;
-    readonly msOrientation: string;
-    onmsorientationchange: ((this: Screen, ev: Event) => any) | null;
-    readonly pixelDepth: number;
-    readonly systemXDPI: number;
-    readonly systemYDPI: number;
-    readonly width: number;
-    lockOrientation(orientations: OrientationLockType | OrientationLockType[]): boolean;
-    msLockOrientation(orientations: string | string[]): boolean;
-    msUnlockOrientation(): void;
-    unlockOrientation(): void;
-    addEventListener<K extends keyof ScreenEventMap>(type: K, listener: (this: Screen, ev: ScreenEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof ScreenEventMap>(type: K, listener: (this: Screen, ev: ScreenEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var Screen: {
-    prototype: Screen;
-    new(): Screen;
-};
-
-interface ScriptProcessorNodeEventMap {
-    "audioprocess": AudioProcessingEvent;
-}
-
-interface ScriptProcessorNode extends AudioNode {
-    /** @deprecated */
-    readonly bufferSize: number;
-    /** @deprecated */
-    onaudioprocess: ((this: ScriptProcessorNode, ev: AudioProcessingEvent) => any) | null;
-    addEventListener<K extends keyof ScriptProcessorNodeEventMap>(type: K, listener: (this: ScriptProcessorNode, ev: ScriptProcessorNodeEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof ScriptProcessorNodeEventMap>(type: K, listener: (this: ScriptProcessorNode, ev: ScriptProcessorNodeEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var ScriptProcessorNode: {
-    prototype: ScriptProcessorNode;
-    new(): ScriptProcessorNode;
-};
-
-interface ScrollIntoViewOptions extends ScrollOptions {
-    block?: ScrollLogicalPosition;
-    inline?: ScrollLogicalPosition;
-}
-
-interface ScrollOptions {
-    behavior?: ScrollBehavior;
-}
-
-interface ScrollToOptions extends ScrollOptions {
-    left?: number;
-    top?: number;
-}
-
-interface SecurityPolicyViolationEvent extends Event {
-    readonly blockedURI: string;
-    readonly columnNumber: number;
-    readonly documentURI: string;
-    readonly effectiveDirective: string;
-    readonly lineNumber: number;
-    readonly originalPolicy: string;
-    readonly referrer: string;
-    readonly sourceFile: string;
-    readonly statusCode: number;
-    readonly violatedDirective: string;
-}
-
-declare var SecurityPolicyViolationEvent: {
-    prototype: SecurityPolicyViolationEvent;
-    new(type: string, eventInitDict?: SecurityPolicyViolationEventInit): SecurityPolicyViolationEvent;
-};
-
-interface Selection {
-    readonly anchorNode: Node;
-    readonly anchorOffset: number;
-    readonly baseNode: Node;
-    readonly baseOffset: number;
-    readonly extentNode: Node;
-    readonly extentOffset: number;
-    readonly focusNode: Node;
-    readonly focusOffset: number;
-    readonly isCollapsed: boolean;
-    readonly rangeCount: number;
-    readonly type: string;
-    addRange(range: Range): void;
-    collapse(parentNode: Node, offset: number): void;
-    collapseToEnd(): void;
-    collapseToStart(): void;
-    containsNode(node: Node, partlyContained: boolean): boolean;
-    deleteFromDocument(): void;
-    empty(): void;
-    extend(newNode: Node, offset: number): void;
-    getRangeAt(index: number): Range;
-    removeAllRanges(): void;
-    removeRange(range: Range): void;
-    selectAllChildren(parentNode: Node): void;
-    setBaseAndExtent(baseNode: Node, baseOffset: number, extentNode: Node, extentOffset: number): void;
-    setPosition(parentNode: Node, offset: number): void;
-    toString(): string;
-}
-
-declare var Selection: {
-    prototype: Selection;
-    new(): Selection;
-};
-
-interface ServiceUIFrameContext {
-    getCachedFrameMessage(key: string): string;
-    postFrameMessage(key: string, data: string): void;
-}
-declare var ServiceUIFrameContext: ServiceUIFrameContext;
-
-interface ServiceWorkerEventMap extends AbstractWorkerEventMap {
-    "statechange": Event;
-}
-
-interface ServiceWorker extends EventTarget, AbstractWorker {
-    onstatechange: ((this: ServiceWorker, ev: Event) => any) | null;
-    readonly scriptURL: string;
-    readonly state: ServiceWorkerState;
-    postMessage(message: any, transfer?: any[]): void;
-    addEventListener<K extends keyof ServiceWorkerEventMap>(type: K, listener: (this: ServiceWorker, ev: ServiceWorkerEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof ServiceWorkerEventMap>(type: K, listener: (this: ServiceWorker, ev: ServiceWorkerEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var ServiceWorker: {
-    prototype: ServiceWorker;
-    new(): ServiceWorker;
-};
-
-interface ServiceWorkerContainerEventMap {
-    "controllerchange": Event;
-    "message": ServiceWorkerMessageEvent;
-    "messageerror": MessageEvent;
-}
-
-interface ServiceWorkerContainer extends EventTarget {
-    readonly controller: ServiceWorker | null;
-    oncontrollerchange: ((this: ServiceWorkerContainer, ev: Event) => any) | null;
-    onmessage: ((this: ServiceWorkerContainer, ev: ServiceWorkerMessageEvent) => any) | null;
-    onmessageerror: ((this: ServiceWorkerContainer, ev: MessageEvent) => any) | null;
-    readonly ready: Promise<ServiceWorkerRegistration>;
-    getRegistration(clientURL?: string): Promise<ServiceWorkerRegistration | undefined>;
-    getRegistrations(): Promise<ServiceWorkerRegistration[]>;
-    register(scriptURL: string, options?: RegistrationOptions): Promise<ServiceWorkerRegistration>;
-    startMessages(): void;
-    addEventListener<K extends keyof ServiceWorkerContainerEventMap>(type: K, listener: (this: ServiceWorkerContainer, ev: ServiceWorkerContainerEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof ServiceWorkerContainerEventMap>(type: K, listener: (this: ServiceWorkerContainer, ev: ServiceWorkerContainerEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var ServiceWorkerContainer: {
-    prototype: ServiceWorkerContainer;
-    new(): ServiceWorkerContainer;
-};
-
-interface ServiceWorkerMessageEvent extends Event {
-    readonly data: any;
-    readonly lastEventId: string;
-    readonly origin: string;
-    readonly ports: ReadonlyArray<MessagePort> | null;
-    readonly source: ServiceWorker | MessagePort | null;
-}
-
-declare var ServiceWorkerMessageEvent: {
-    prototype: ServiceWorkerMessageEvent;
-    new(type: string, eventInitDict?: ServiceWorkerMessageEventInit): ServiceWorkerMessageEvent;
-};
-
-interface ServiceWorkerRegistrationEventMap {
-    "updatefound": Event;
-}
-
-interface ServiceWorkerRegistration extends EventTarget {
-    readonly active: ServiceWorker | null;
-    readonly installing: ServiceWorker | null;
-    onupdatefound: ((this: ServiceWorkerRegistration, ev: Event) => any) | null;
-    readonly pushManager: PushManager;
-    readonly scope: string;
-    readonly sync: SyncManager;
-    readonly waiting: ServiceWorker | null;
-    getNotifications(filter?: GetNotificationOptions): Promise<Notification[]>;
-    showNotification(title: string, options?: NotificationOptions): Promise<void>;
-    unregister(): Promise<boolean>;
-    update(): Promise<void>;
-    addEventListener<K extends keyof ServiceWorkerRegistrationEventMap>(type: K, listener: (this: ServiceWorkerRegistration, ev: ServiceWorkerRegistrationEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof ServiceWorkerRegistrationEventMap>(type: K, listener: (this: ServiceWorkerRegistration, ev: ServiceWorkerRegistrationEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var ServiceWorkerRegistration: {
-    prototype: ServiceWorkerRegistration;
-    new(): ServiceWorkerRegistration;
-};
-
-interface ShadowRoot extends DocumentOrShadowRoot, DocumentFragment {
-    readonly host: Element;
-    innerHTML: string;
-}
-
-interface ShadowRootInit {
-    delegatesFocus?: boolean;
-    mode: "open" | "closed";
-}
-
-interface SourceBuffer extends EventTarget {
-    appendWindowEnd: number;
-    appendWindowStart: number;
-    readonly audioTracks: AudioTrackList;
-    readonly buffered: TimeRanges;
-    mode: AppendMode;
-    readonly textTracks: TextTrackList;
-    timestampOffset: number;
-    readonly updating: boolean;
-    readonly videoTracks: VideoTrackList;
-    abort(): void;
-    appendBuffer(data: ArrayBuffer | Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | null): void;
-    appendStream(stream: MSStream, maxSize?: number): void;
-    remove(start: number, end: number): void;
-}
-
-declare var SourceBuffer: {
-    prototype: SourceBuffer;
-    new(): SourceBuffer;
-};
-
-interface SourceBufferList extends EventTarget {
-    readonly length: number;
-    item(index: number): SourceBuffer;
-    [index: number]: SourceBuffer;
-}
-
-declare var SourceBufferList: {
-    prototype: SourceBufferList;
-    new(): SourceBufferList;
-};
-
-interface SpeechSynthesisEventMap {
-    "voiceschanged": Event;
-}
-
-interface SpeechSynthesis extends EventTarget {
-    onvoiceschanged: ((this: SpeechSynthesis, ev: Event) => any) | null;
-    readonly paused: boolean;
-    readonly pending: boolean;
-    readonly speaking: boolean;
-    cancel(): void;
-    getVoices(): SpeechSynthesisVoice[];
-    pause(): void;
-    resume(): void;
-    speak(utterance: SpeechSynthesisUtterance): void;
-    addEventListener<K extends keyof SpeechSynthesisEventMap>(type: K, listener: (this: SpeechSynthesis, ev: SpeechSynthesisEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SpeechSynthesisEventMap>(type: K, listener: (this: SpeechSynthesis, ev: SpeechSynthesisEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SpeechSynthesis: {
-    prototype: SpeechSynthesis;
-    new(): SpeechSynthesis;
-};
-
-interface SpeechSynthesisEvent extends Event {
-    readonly charIndex: number;
-    readonly charLength: number;
-    readonly elapsedTime: number;
-    readonly name: string;
-    readonly utterance: SpeechSynthesisUtterance;
-}
-
-declare var SpeechSynthesisEvent: {
-    prototype: SpeechSynthesisEvent;
-    new(type: string, eventInitDict?: SpeechSynthesisEventInit): SpeechSynthesisEvent;
-};
-
-interface SpeechSynthesisUtteranceEventMap {
-    "boundary": Event;
-    "end": Event;
-    "error": Event;
-    "mark": Event;
-    "pause": Event;
-    "resume": Event;
-    "start": Event;
-}
-
-interface SpeechSynthesisUtterance extends EventTarget {
-    lang: string;
-    onboundary: ((this: SpeechSynthesisUtterance, ev: Event) => any) | null;
-    onend: ((this: SpeechSynthesisUtterance, ev: Event) => any) | null;
-    onerror: ((this: SpeechSynthesisUtterance, ev: Event) => any) | null;
-    onmark: ((this: SpeechSynthesisUtterance, ev: Event) => any) | null;
-    onpause: ((this: SpeechSynthesisUtterance, ev: Event) => any) | null;
-    onresume: ((this: SpeechSynthesisUtterance, ev: Event) => any) | null;
-    onstart: ((this: SpeechSynthesisUtterance, ev: Event) => any) | null;
-    pitch: number;
-    rate: number;
-    text: string;
-    voice: SpeechSynthesisVoice;
-    volume: number;
-    addEventListener<K extends keyof SpeechSynthesisUtteranceEventMap>(type: K, listener: (this: SpeechSynthesisUtterance, ev: SpeechSynthesisUtteranceEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SpeechSynthesisUtteranceEventMap>(type: K, listener: (this: SpeechSynthesisUtterance, ev: SpeechSynthesisUtteranceEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SpeechSynthesisUtterance: {
-    prototype: SpeechSynthesisUtterance;
-    new(): SpeechSynthesisUtterance;
-    new(text: string): SpeechSynthesisUtterance;
-};
-
-interface SpeechSynthesisVoice {
-    readonly default: boolean;
-    readonly lang: string;
-    readonly localService: boolean;
-    readonly name: string;
-    readonly voiceURI: string;
-}
-
-declare var SpeechSynthesisVoice: {
-    prototype: SpeechSynthesisVoice;
-    new(): SpeechSynthesisVoice;
-};
-
-interface StereoPannerNode extends AudioNode {
-    readonly pan: AudioParam;
-}
-
-declare var StereoPannerNode: {
-    prototype: StereoPannerNode;
-    new(): StereoPannerNode;
-};
-
-interface Storage {
-    readonly length: number;
-    clear(): void;
-    getItem(key: string): string | null;
-    key(index: number): string | null;
-    removeItem(key: string): void;
-    setItem(key: string, value: string): void;
-    [key: string]: any;
-}
-
-declare var Storage: {
-    prototype: Storage;
-    new(): Storage;
-};
-
-interface StorageEvent extends Event {
-    readonly key: string | null;
-    readonly newValue: string | null;
-    readonly oldValue: string | null;
-    readonly storageArea: Storage | null;
-    readonly url: string;
-}
-
-declare var StorageEvent: {
-    prototype: StorageEvent;
-    new (type: string, eventInitDict?: StorageEventInit): StorageEvent;
-};
-
-interface StorageEventInit extends EventInit {
-    key?: string;
-    newValue?: string;
-    oldValue?: string;
-    storageArea?: Storage;
-    url: string;
-}
-
-interface StyleMedia {
-    readonly type: string;
-    matchMedium(mediaquery: string): boolean;
-}
-
-declare var StyleMedia: {
-    prototype: StyleMedia;
-    new(): StyleMedia;
-};
-
-interface StyleSheet {
-    disabled: boolean;
-    readonly href: string | null;
-    readonly media: MediaList;
-    readonly ownerNode: Node;
-    readonly parentStyleSheet: StyleSheet | null;
-    readonly title: string | null;
-    readonly type: string;
-}
-
-declare var StyleSheet: {
-    prototype: StyleSheet;
-    new(): StyleSheet;
-};
-
-interface StyleSheetList {
-    readonly length: number;
-    item(index: number): StyleSheet | null;
-    [index: number]: StyleSheet;
-}
-
-declare var StyleSheetList: {
-    prototype: StyleSheetList;
-    new(): StyleSheetList;
-};
-
-interface SubtleCrypto {
-    decrypt(algorithm: string | RsaOaepParams | AesCtrParams | AesCbcParams | AesCmacParams | AesGcmParams | AesCfbParams, key: CryptoKey, data: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer): PromiseLike<ArrayBuffer>;
-    deriveBits(algorithm: string | EcdhKeyDeriveParams | DhKeyDeriveParams | ConcatParams | HkdfCtrParams | Pbkdf2Params, baseKey: CryptoKey, length: number): PromiseLike<ArrayBuffer>;
-    deriveKey(algorithm: string | EcdhKeyDeriveParams | DhKeyDeriveParams | ConcatParams | HkdfCtrParams | Pbkdf2Params, baseKey: CryptoKey, derivedKeyType: string | AesDerivedKeyParams | HmacImportParams | ConcatParams | HkdfCtrParams | Pbkdf2Params, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKey>;
-    digest(algorithm: string | Algorithm, data: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer): PromiseLike<ArrayBuffer>;
-    encrypt(algorithm: string | RsaOaepParams | AesCtrParams | AesCbcParams | AesCmacParams | AesGcmParams | AesCfbParams, key: CryptoKey, data: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer): PromiseLike<ArrayBuffer>;
-    exportKey(format: "jwk", key: CryptoKey): PromiseLike<JsonWebKey>;
-    exportKey(format: "raw" | "pkcs8" | "spki", key: CryptoKey): PromiseLike<ArrayBuffer>;
-    exportKey(format: string, key: CryptoKey): PromiseLike<JsonWebKey | ArrayBuffer>;
-    generateKey(algorithm: string, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKeyPair | CryptoKey>;
-    generateKey(algorithm: RsaHashedKeyGenParams | EcKeyGenParams | DhKeyGenParams, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKeyPair>;
-    generateKey(algorithm: AesKeyGenParams | HmacKeyGenParams | Pbkdf2Params, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKey>;
-    importKey(format: "jwk", keyData: JsonWebKey, algorithm: string | RsaHashedImportParams | EcKeyImportParams | HmacImportParams | DhImportKeyParams, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKey>;
-    importKey(format: "raw" | "pkcs8" | "spki", keyData: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer, algorithm: string | RsaHashedImportParams | EcKeyImportParams | HmacImportParams | DhImportKeyParams, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKey>;
-    importKey(format: string, keyData: JsonWebKey | Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer, algorithm: string | RsaHashedImportParams | EcKeyImportParams | HmacImportParams | DhImportKeyParams, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKey>;
-    sign(algorithm: string | RsaPssParams | EcdsaParams | AesCmacParams, key: CryptoKey, data: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer): PromiseLike<ArrayBuffer>;
-    unwrapKey(format: string, wrappedKey: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer, unwrappingKey: CryptoKey, unwrapAlgorithm: string | Algorithm, unwrappedKeyAlgorithm: string | Algorithm, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKey>;
-    verify(algorithm: string | RsaPssParams | EcdsaParams | AesCmacParams, key: CryptoKey, signature: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer, data: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer): PromiseLike<boolean>;
-    wrapKey(format: string, key: CryptoKey, wrappingKey: CryptoKey, wrapAlgorithm: string | Algorithm): PromiseLike<ArrayBuffer>;
-}
-
-declare var SubtleCrypto: {
-    prototype: SubtleCrypto;
-    new(): SubtleCrypto;
-};
-
-interface SyncManager {
-    getTags(): Promise<string[]>;
-    register(tag: string): Promise<void>;
-}
-
-declare var SyncManager: {
-    prototype: SyncManager;
-    new(): SyncManager;
-};
-
-interface Text extends CharacterData {
-    readonly assignedSlot: HTMLSlotElement | null;
-    readonly wholeText: string;
-    splitText(offset: number): Text;
-}
-
-declare var Text: {
-    prototype: Text;
-    new(data?: string): Text;
-};
-
-interface TextDecoder {
-    readonly encoding: string;
-    readonly fatal: boolean;
-    readonly ignoreBOM: boolean;
-    decode(input?: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null, options?: TextDecodeOptions): string;
-}
-
-declare var TextDecoder: {
-    prototype: TextDecoder;
-    new(label?: string, options?: TextDecoderOptions): TextDecoder;
-};
-
-interface TextEncoder {
-    readonly encoding: string;
-    encode(input?: string): Uint8Array;
-}
-
-declare var TextEncoder: {
-    prototype: TextEncoder;
-    new(): TextEncoder;
-};
-
-interface TextEvent extends UIEvent {
-    readonly data: string;
-    initTextEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, dataArg: string, inputMethod: number, locale: string): void;
-    readonly DOM_INPUT_METHOD_DROP: number;
-    readonly DOM_INPUT_METHOD_HANDWRITING: number;
-    readonly DOM_INPUT_METHOD_IME: number;
-    readonly DOM_INPUT_METHOD_KEYBOARD: number;
-    readonly DOM_INPUT_METHOD_MULTIMODAL: number;
-    readonly DOM_INPUT_METHOD_OPTION: number;
-    readonly DOM_INPUT_METHOD_PASTE: number;
-    readonly DOM_INPUT_METHOD_SCRIPT: number;
-    readonly DOM_INPUT_METHOD_UNKNOWN: number;
-    readonly DOM_INPUT_METHOD_VOICE: number;
-}
-
-declare var TextEvent: {
-    prototype: TextEvent;
-    new(): TextEvent;
-    readonly DOM_INPUT_METHOD_DROP: number;
-    readonly DOM_INPUT_METHOD_HANDWRITING: number;
-    readonly DOM_INPUT_METHOD_IME: number;
-    readonly DOM_INPUT_METHOD_KEYBOARD: number;
-    readonly DOM_INPUT_METHOD_MULTIMODAL: number;
-    readonly DOM_INPUT_METHOD_OPTION: number;
-    readonly DOM_INPUT_METHOD_PASTE: number;
-    readonly DOM_INPUT_METHOD_SCRIPT: number;
-    readonly DOM_INPUT_METHOD_UNKNOWN: number;
-    readonly DOM_INPUT_METHOD_VOICE: number;
-};
-
-interface TextMetrics {
-    readonly width: number;
-}
-
-declare var TextMetrics: {
-    prototype: TextMetrics;
-    new(): TextMetrics;
-};
-
-interface TextTrackEventMap {
-    "cuechange": Event;
-    "error": Event;
-    "load": Event;
-}
-
-interface TextTrack extends EventTarget {
-    readonly activeCues: TextTrackCueList;
-    readonly cues: TextTrackCueList;
-    readonly inBandMetadataTrackDispatchType: string;
-    readonly kind: string;
-    readonly label: string;
-    readonly language: string;
-    mode: TextTrackMode | number;
-    oncuechange: ((this: TextTrack, ev: Event) => any) | null;
-    onerror: ((this: TextTrack, ev: Event) => any) | null;
-    onload: ((this: TextTrack, ev: Event) => any) | null;
-    readonly readyState: number;
-    addCue(cue: TextTrackCue): void;
-    removeCue(cue: TextTrackCue): void;
-    readonly DISABLED: number;
-    readonly ERROR: number;
-    readonly HIDDEN: number;
-    readonly LOADED: number;
-    readonly LOADING: number;
-    readonly NONE: number;
-    readonly SHOWING: number;
-    addEventListener<K extends keyof TextTrackEventMap>(type: K, listener: (this: TextTrack, ev: TextTrackEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof TextTrackEventMap>(type: K, listener: (this: TextTrack, ev: TextTrackEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var TextTrack: {
-    prototype: TextTrack;
-    new(): TextTrack;
-    readonly DISABLED: number;
-    readonly ERROR: number;
-    readonly HIDDEN: number;
-    readonly LOADED: number;
-    readonly LOADING: number;
-    readonly NONE: number;
-    readonly SHOWING: number;
-};
-
-interface TextTrackCueEventMap {
-    "enter": Event;
-    "exit": Event;
-}
-
-interface TextTrackCue extends EventTarget {
-    endTime: number;
-    id: string;
-    onenter: ((this: TextTrackCue, ev: Event) => any) | null;
-    onexit: ((this: TextTrackCue, ev: Event) => any) | null;
-    pauseOnExit: boolean;
-    startTime: number;
-    text: string;
-    readonly track: TextTrack;
-    getCueAsHTML(): DocumentFragment;
-    addEventListener<K extends keyof TextTrackCueEventMap>(type: K, listener: (this: TextTrackCue, ev: TextTrackCueEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof TextTrackCueEventMap>(type: K, listener: (this: TextTrackCue, ev: TextTrackCueEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var TextTrackCue: {
-    prototype: TextTrackCue;
-    new(startTime: number, endTime: number, text: string): TextTrackCue;
-};
-
-interface TextTrackCueList {
-    readonly length: number;
-    getCueById(id: string): TextTrackCue;
-    item(index: number): TextTrackCue;
-    [index: number]: TextTrackCue;
-}
-
-declare var TextTrackCueList: {
-    prototype: TextTrackCueList;
-    new(): TextTrackCueList;
-};
-
-interface TextTrackListEventMap {
-    "addtrack": TrackEvent;
-}
-
-interface TextTrackList extends EventTarget {
-    readonly length: number;
-    onaddtrack: ((this: TextTrackList, ev: TrackEvent) => any) | null;
-    item(index: number): TextTrack;
-    addEventListener<K extends keyof TextTrackListEventMap>(type: K, listener: (this: TextTrackList, ev: TextTrackListEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof TextTrackListEventMap>(type: K, listener: (this: TextTrackList, ev: TextTrackListEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-    [index: number]: TextTrack;
-}
-
-declare var TextTrackList: {
-    prototype: TextTrackList;
-    new(): TextTrackList;
-};
-
-interface TimeRanges {
-    readonly length: number;
-    end(index: number): number;
-    start(index: number): number;
-}
-
-declare var TimeRanges: {
-    prototype: TimeRanges;
-    new(): TimeRanges;
-};
-
-interface Touch {
-    readonly clientX: number;
-    readonly clientY: number;
-    readonly identifier: number;
-    readonly pageX: number;
-    readonly pageY: number;
-    readonly screenX: number;
-    readonly screenY: number;
-    readonly target: EventTarget;
-}
-
-declare var Touch: {
-    prototype: Touch;
-    new(): Touch;
-};
-
-interface TouchEvent extends UIEvent {
-    readonly altKey: boolean;
-    readonly changedTouches: TouchList;
-    readonly charCode: number;
-    readonly ctrlKey: boolean;
-    readonly keyCode: number;
-    readonly metaKey: boolean;
-    readonly shiftKey: boolean;
-    readonly targetTouches: TouchList;
-    readonly touches: TouchList;
-    /** @deprecated */
-    readonly which: number;
-}
-
-declare var TouchEvent: {
-    prototype: TouchEvent;
-    new(type: string, touchEventInit?: TouchEventInit): TouchEvent;
-};
-
-interface TouchEventInit extends EventModifierInit {
-    changedTouches?: Touch[];
-    targetTouches?: Touch[];
-    touches?: Touch[];
-}
-
-interface TouchList {
-    readonly length: number;
-    item(index: number): Touch | null;
-    [index: number]: Touch;
-}
-
-declare var TouchList: {
-    prototype: TouchList;
-    new(): TouchList;
-};
-
-interface TrackEvent extends Event {
-    readonly track: VideoTrack | AudioTrack | TextTrack | null;
-}
-
-declare var TrackEvent: {
-    prototype: TrackEvent;
-    new(typeArg: string, eventInitDict?: TrackEventInit): TrackEvent;
-};
-
-interface TransitionEvent extends Event {
-    readonly elapsedTime: number;
-    readonly propertyName: string;
-    initTransitionEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, propertyNameArg: string, elapsedTimeArg: number): void;
-}
-
-declare var TransitionEvent: {
-    prototype: TransitionEvent;
-    new(typeArg: string, eventInitDict?: TransitionEventInit): TransitionEvent;
-};
-
-interface TreeWalker {
-    currentNode: Node;
-    /** @deprecated */
-    readonly expandEntityReferences: boolean;
-    readonly filter: NodeFilter | null;
-    readonly root: Node;
-    readonly whatToShow: number;
-    firstChild(): Node | null;
-    lastChild(): Node | null;
-    nextNode(): Node | null;
-    nextSibling(): Node | null;
-    parentNode(): Node | null;
-    previousNode(): Node | null;
-    previousSibling(): Node | null;
-}
-
-declare var TreeWalker: {
-    prototype: TreeWalker;
-    new(): TreeWalker;
-};
-
-interface UIEvent extends Event {
-    readonly detail: number;
-    readonly view: Window;
-    initUIEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number): void;
-}
-
-declare var UIEvent: {
-    prototype: UIEvent;
-    new(typeArg: string, eventInitDict?: UIEventInit): UIEvent;
-};
-
-interface URL {
-    hash: string;
-    host: string;
-    hostname: string;
-    href: string;
-    readonly origin: string;
-    password: string;
-    pathname: string;
-    port: string;
-    protocol: string;
-    search: string;
-    readonly searchParams: URLSearchParams;
-    username: string;
-    toString(): string;
-}
-
-declare var URL: {
-    prototype: URL;
-    new(url: string, base?: string | URL): URL;
-    createObjectURL(object: any, options?: ObjectURLOptions): string;
-    revokeObjectURL(url: string): void;
-};
-
-interface URLSearchParams {
-    /**
-     * Appends a specified key/value pair as a new search parameter.
-     */
-    append(name: string, value: string): void;
-    /**
-     * Deletes the given search parameter, and its associated value, from the list of all search parameters.
-     */
-    delete(name: string): void;
-    /**
-     * Returns the first value associated to the given search parameter.
-     */
-    get(name: string): string | null;
-    /**
-     * Returns all the values association with a given search parameter.
-     */
-    getAll(name: string): string[];
-    /**
-     * Returns a Boolean indicating if such a search parameter exists.
-     */
-    has(name: string): boolean;
-    /**
-     * Sets the value associated to a given search parameter to the given value. If there were several values, delete the others.
-     */
-    set(name: string, value: string): void;
-}
-
-declare var URLSearchParams: {
-    prototype: URLSearchParams;
-    new (init?: string | URLSearchParams): URLSearchParams;
-};
-
-interface VRDisplay extends EventTarget {
-    readonly capabilities: VRDisplayCapabilities;
-    depthFar: number;
-    depthNear: number;
-    readonly displayId: number;
-    readonly displayName: string;
-    readonly isConnected: boolean;
-    readonly isPresenting: boolean;
-    readonly stageParameters: VRStageParameters | null;
-    cancelAnimationFrame(handle: number): void;
-    exitPresent(): Promise<void>;
-    getEyeParameters(whichEye: string): VREyeParameters;
-    getFrameData(frameData: VRFrameData): boolean;
-    getLayers(): VRLayer[];
-    /** @deprecated */
-    getPose(): VRPose;
-    requestAnimationFrame(callback: FrameRequestCallback): number;
-    requestPresent(layers: VRLayer[]): Promise<void>;
-    resetPose(): void;
-    submitFrame(pose?: VRPose): void;
-}
-
-declare var VRDisplay: {
-    prototype: VRDisplay;
-    new(): VRDisplay;
-};
-
-interface VRDisplayCapabilities {
-    readonly canPresent: boolean;
-    readonly hasExternalDisplay: boolean;
-    readonly hasOrientation: boolean;
-    readonly hasPosition: boolean;
-    readonly maxLayers: number;
-}
-
-declare var VRDisplayCapabilities: {
-    prototype: VRDisplayCapabilities;
-    new(): VRDisplayCapabilities;
-};
-
-interface VRDisplayEvent extends Event {
-    readonly display: VRDisplay;
-    readonly reason: VRDisplayEventReason | null;
-}
-
-declare var VRDisplayEvent: {
-    prototype: VRDisplayEvent;
-    new(type: string, eventInitDict: VRDisplayEventInit): VRDisplayEvent;
-};
-
-interface VREyeParameters {
-    /** @deprecated */
-    readonly fieldOfView: VRFieldOfView;
-    readonly offset: Float32Array;
-    readonly renderHeight: number;
-    readonly renderWidth: number;
-}
-
-declare var VREyeParameters: {
-    prototype: VREyeParameters;
-    new(): VREyeParameters;
-};
-
-interface VRFieldOfView {
-    readonly downDegrees: number;
-    readonly leftDegrees: number;
-    readonly rightDegrees: number;
-    readonly upDegrees: number;
-}
-
-declare var VRFieldOfView: {
-    prototype: VRFieldOfView;
-    new(): VRFieldOfView;
-};
-
-interface VRFrameData {
-    readonly leftProjectionMatrix: Float32Array;
-    readonly leftViewMatrix: Float32Array;
-    readonly pose: VRPose;
-    readonly rightProjectionMatrix: Float32Array;
-    readonly rightViewMatrix: Float32Array;
-    readonly timestamp: number;
-}
-
-declare var VRFrameData: {
-    prototype: VRFrameData;
-    new(): VRFrameData;
-};
-
-interface VRPose {
-    readonly angularAcceleration: Float32Array | null;
-    readonly angularVelocity: Float32Array | null;
-    readonly linearAcceleration: Float32Array | null;
-    readonly linearVelocity: Float32Array | null;
-    readonly orientation: Float32Array | null;
-    readonly position: Float32Array | null;
-    readonly timestamp: number;
-}
-
-declare var VRPose: {
-    prototype: VRPose;
-    new(): VRPose;
-};
-
-interface ValidityState {
-    readonly badInput: boolean;
-    readonly customError: boolean;
-    readonly patternMismatch: boolean;
-    readonly rangeOverflow: boolean;
-    readonly rangeUnderflow: boolean;
-    readonly stepMismatch: boolean;
-    readonly tooLong: boolean;
-    readonly tooShort: boolean;
-    readonly typeMismatch: boolean;
-    readonly valid: boolean;
-    readonly valueMissing: boolean;
-}
-
-declare var ValidityState: {
-    prototype: ValidityState;
-    new(): ValidityState;
-};
-
-interface VideoPlaybackQuality {
-    readonly corruptedVideoFrames: number;
-    readonly creationTime: number;
-    readonly droppedVideoFrames: number;
-    readonly totalFrameDelay: number;
-    readonly totalVideoFrames: number;
-}
-
-declare var VideoPlaybackQuality: {
-    prototype: VideoPlaybackQuality;
-    new(): VideoPlaybackQuality;
-};
-
-interface VideoTrack {
-    readonly id: string;
-    kind: string;
-    readonly label: string;
-    language: string;
-    selected: boolean;
-    readonly sourceBuffer: SourceBuffer;
-}
-
-declare var VideoTrack: {
-    prototype: VideoTrack;
-    new(): VideoTrack;
-};
-
-interface VideoTrackListEventMap {
-    "addtrack": TrackEvent;
-    "change": Event;
-    "removetrack": TrackEvent;
-}
-
-interface VideoTrackList extends EventTarget {
-    readonly length: number;
-    onaddtrack: ((this: VideoTrackList, ev: TrackEvent) => any) | null;
-    onchange: ((this: VideoTrackList, ev: Event) => any) | null;
-    onremovetrack: ((this: VideoTrackList, ev: TrackEvent) => any) | null;
-    readonly selectedIndex: number;
-    getTrackById(id: string): VideoTrack | null;
-    item(index: number): VideoTrack;
-    addEventListener<K extends keyof VideoTrackListEventMap>(type: K, listener: (this: VideoTrackList, ev: VideoTrackListEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof VideoTrackListEventMap>(type: K, listener: (this: VideoTrackList, ev: VideoTrackListEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-    [index: number]: VideoTrack;
-}
-
-declare var VideoTrackList: {
-    prototype: VideoTrackList;
-    new(): VideoTrackList;
-};
-
-interface WEBGL_color_buffer_float {
-    readonly FRAMEBUFFER_ATTACHMENT_COMPONENT_TYPE_EXT: number;
-    readonly RGB32F_EXT: number;
-    readonly RGBA32F_EXT: number;
-    readonly UNSIGNED_NORMALIZED_EXT: number;
-}
-
-interface WEBGL_compressed_texture_astc {
-    readonly COMPRESSED_RGBA_ASTC_10x10_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_10x5_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_10x6_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_10x8_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_12x10_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_12x12_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_4x4_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_5x4_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_5x5_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_6x5_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_6x6_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_8x5_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_8x6_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_8x8_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_10x10_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_10x5_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_10x6_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_10x8_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_12x10_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_12x12_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_4x4_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_5x4_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_5x5_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_6x5_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_6x6_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_8x5_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_8x6_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_8x8_KHR: number;
-    getSupportedProfiles(): string[];
-}
-
-interface WEBGL_compressed_texture_s3tc {
-    readonly COMPRESSED_RGBA_S3TC_DXT1_EXT: number;
-    readonly COMPRESSED_RGBA_S3TC_DXT3_EXT: number;
-    readonly COMPRESSED_RGBA_S3TC_DXT5_EXT: number;
-    readonly COMPRESSED_RGB_S3TC_DXT1_EXT: number;
-}
-
-declare var WEBGL_compressed_texture_s3tc: {
-    prototype: WEBGL_compressed_texture_s3tc;
-    new(): WEBGL_compressed_texture_s3tc;
-    readonly COMPRESSED_RGBA_S3TC_DXT1_EXT: number;
-    readonly COMPRESSED_RGBA_S3TC_DXT3_EXT: number;
-    readonly COMPRESSED_RGBA_S3TC_DXT5_EXT: number;
-    readonly COMPRESSED_RGB_S3TC_DXT1_EXT: number;
-};
-
-interface WEBGL_compressed_texture_s3tc_srgb {
-    readonly COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT: number;
-    readonly COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT: number;
-    readonly COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT: number;
-    readonly COMPRESSED_SRGB_S3TC_DXT1_EXT: number;
-}
-
-interface WEBGL_debug_renderer_info {
-    readonly UNMASKED_RENDERER_WEBGL: number;
-    readonly UNMASKED_VENDOR_WEBGL: number;
-}
-
-declare var WEBGL_debug_renderer_info: {
-    prototype: WEBGL_debug_renderer_info;
-    new(): WEBGL_debug_renderer_info;
-    readonly UNMASKED_RENDERER_WEBGL: number;
-    readonly UNMASKED_VENDOR_WEBGL: number;
-};
-
-interface WEBGL_debug_shaders {
-    getTranslatedShaderSource(shader: WebGLShader): string;
-}
-
-interface WEBGL_depth_texture {
-    readonly UNSIGNED_INT_24_8_WEBGL: number;
-}
-
-declare var WEBGL_depth_texture: {
-    prototype: WEBGL_depth_texture;
-    new(): WEBGL_depth_texture;
-    readonly UNSIGNED_INT_24_8_WEBGL: number;
-};
-
-interface WEBGL_draw_buffers {
-    readonly COLOR_ATTACHMENT0_WEBGL: number;
-    readonly COLOR_ATTACHMENT10_WEBGL: number;
-    readonly COLOR_ATTACHMENT11_WEBGL: number;
-    readonly COLOR_ATTACHMENT12_WEBGL: number;
-    readonly COLOR_ATTACHMENT13_WEBGL: number;
-    readonly COLOR_ATTACHMENT14_WEBGL: number;
-    readonly COLOR_ATTACHMENT15_WEBGL: number;
-    readonly COLOR_ATTACHMENT1_WEBGL: number;
-    readonly COLOR_ATTACHMENT2_WEBGL: number;
-    readonly COLOR_ATTACHMENT3_WEBGL: number;
-    readonly COLOR_ATTACHMENT4_WEBGL: number;
-    readonly COLOR_ATTACHMENT5_WEBGL: number;
-    readonly COLOR_ATTACHMENT6_WEBGL: number;
-    readonly COLOR_ATTACHMENT7_WEBGL: number;
-    readonly COLOR_ATTACHMENT8_WEBGL: number;
-    readonly COLOR_ATTACHMENT9_WEBGL: number;
-    readonly DRAW_BUFFER0_WEBGL: number;
-    readonly DRAW_BUFFER10_WEBGL: number;
-    readonly DRAW_BUFFER11_WEBGL: number;
-    readonly DRAW_BUFFER12_WEBGL: number;
-    readonly DRAW_BUFFER13_WEBGL: number;
-    readonly DRAW_BUFFER14_WEBGL: number;
-    readonly DRAW_BUFFER15_WEBGL: number;
-    readonly DRAW_BUFFER1_WEBGL: number;
-    readonly DRAW_BUFFER2_WEBGL: number;
-    readonly DRAW_BUFFER3_WEBGL: number;
-    readonly DRAW_BUFFER4_WEBGL: number;
-    readonly DRAW_BUFFER5_WEBGL: number;
-    readonly DRAW_BUFFER6_WEBGL: number;
-    readonly DRAW_BUFFER7_WEBGL: number;
-    readonly DRAW_BUFFER8_WEBGL: number;
-    readonly DRAW_BUFFER9_WEBGL: number;
-    readonly MAX_COLOR_ATTACHMENTS_WEBGL: number;
-    readonly MAX_DRAW_BUFFERS_WEBGL: number;
-    drawBuffersWEBGL(buffers: number[]): void;
-}
-
-interface WEBGL_lose_context {
-    loseContext(): void;
-    restoreContext(): void;
-}
-
-interface WaveShaperNode extends AudioNode {
-    curve: Float32Array | null;
-    oversample: OverSampleType;
-}
-
-declare var WaveShaperNode: {
-    prototype: WaveShaperNode;
-    new(): WaveShaperNode;
-};
-
-interface WebAuthentication {
-    getAssertion(assertionChallenge: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null, options?: AssertionOptions): Promise<WebAuthnAssertion>;
-    makeCredential(accountInformation: Account, cryptoParameters: ScopedCredentialParameters[], attestationChallenge: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null, options?: ScopedCredentialOptions): Promise<ScopedCredentialInfo>;
-}
-
-declare var WebAuthentication: {
-    prototype: WebAuthentication;
-    new(): WebAuthentication;
-};
-
-interface WebAuthnAssertion {
-    readonly authenticatorData: ArrayBuffer;
-    readonly clientData: ArrayBuffer;
-    readonly credential: ScopedCredential;
-    readonly signature: ArrayBuffer;
-}
-
-declare var WebAuthnAssertion: {
-    prototype: WebAuthnAssertion;
-    new(): WebAuthnAssertion;
-};
-
-interface WebGLActiveInfo {
-    readonly name: string;
-    readonly size: number;
-    readonly type: number;
-}
-
-declare var WebGLActiveInfo: {
-    prototype: WebGLActiveInfo;
-    new(): WebGLActiveInfo;
-};
-
-interface WebGLBuffer extends WebGLObject {
-}
-
-declare var WebGLBuffer: {
-    prototype: WebGLBuffer;
-    new(): WebGLBuffer;
-};
-
-interface WebGLContextEvent extends Event {
-    readonly statusMessage: string;
-}
-
-declare var WebGLContextEvent: {
-    prototype: WebGLContextEvent;
-    new(typeArg: string, eventInitDict?: WebGLContextEventInit): WebGLContextEvent;
-};
-
-interface WebGLFramebuffer extends WebGLObject {
-}
-
-declare var WebGLFramebuffer: {
-    prototype: WebGLFramebuffer;
-    new(): WebGLFramebuffer;
-};
-
-interface WebGLObject {
-}
-
-declare var WebGLObject: {
-    prototype: WebGLObject;
-    new(): WebGLObject;
-};
-
-interface WebGLProgram extends WebGLObject {
-}
-
-declare var WebGLProgram: {
-    prototype: WebGLProgram;
-    new(): WebGLProgram;
-};
-
-interface WebGLRenderbuffer extends WebGLObject {
-}
-
-declare var WebGLRenderbuffer: {
-    prototype: WebGLRenderbuffer;
-    new(): WebGLRenderbuffer;
-};
-
-interface WebGLRenderingContext {
-    readonly canvas: HTMLCanvasElement;
-    readonly drawingBufferHeight: number;
-    readonly drawingBufferWidth: number;
-    activeTexture(texture: number): void;
-    attachShader(program: WebGLProgram | null, shader: WebGLShader | null): void;
-    bindAttribLocation(program: WebGLProgram | null, index: number, name: string): void;
-    bindBuffer(target: number, buffer: WebGLBuffer | null): void;
-    bindFramebuffer(target: number, framebuffer: WebGLFramebuffer | null): void;
-    bindRenderbuffer(target: number, renderbuffer: WebGLRenderbuffer | null): void;
-    bindTexture(target: number, texture: WebGLTexture | null): void;
-    blendColor(red: number, green: number, blue: number, alpha: number): void;
-    blendEquation(mode: number): void;
-    blendEquationSeparate(modeRGB: number, modeAlpha: number): void;
-    blendFunc(sfactor: number, dfactor: number): void;
-    blendFuncSeparate(srcRGB: number, dstRGB: number, srcAlpha: number, dstAlpha: number): void;
-    bufferData(target: number, size: number | Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null, usage: number): void;
-    bufferSubData(target: number, offset: number, data: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null): void;
-    checkFramebufferStatus(target: number): number;
-    clear(mask: number): void;
-    clearColor(red: number, green: number, blue: number, alpha: number): void;
-    clearDepth(depth: number): void;
-    clearStencil(s: number): void;
-    colorMask(red: boolean, green: boolean, blue: boolean, alpha: boolean): void;
-    compileShader(shader: WebGLShader | null): void;
-    compressedTexImage2D(target: number, level: number, internalformat: number, width: number, height: number, border: number, data: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | null): void;
-    compressedTexSubImage2D(target: number, level: number, xoffset: number, yoffset: number, width: number, height: number, format: number, data: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | null): void;
-    copyTexImage2D(target: number, level: number, internalformat: number, x: number, y: number, width: number, height: number, border: number): void;
-    copyTexSubImage2D(target: number, level: number, xoffset: number, yoffset: number, x: number, y: number, width: number, height: number): void;
-    createBuffer(): WebGLBuffer | null;
-    createFramebuffer(): WebGLFramebuffer | null;
-    createProgram(): WebGLProgram | null;
-    createRenderbuffer(): WebGLRenderbuffer | null;
-    createShader(type: number): WebGLShader | null;
-    createTexture(): WebGLTexture | null;
-    cullFace(mode: number): void;
-    deleteBuffer(buffer: WebGLBuffer | null): void;
-    deleteFramebuffer(framebuffer: WebGLFramebuffer | null): void;
-    deleteProgram(program: WebGLProgram | null): void;
-    deleteRenderbuffer(renderbuffer: WebGLRenderbuffer | null): void;
-    deleteShader(shader: WebGLShader | null): void;
-    deleteTexture(texture: WebGLTexture | null): void;
-    depthFunc(func: number): void;
-    depthMask(flag: boolean): void;
-    depthRange(zNear: number, zFar: number): void;
-    detachShader(program: WebGLProgram | null, shader: WebGLShader | null): void;
-    disable(cap: number): void;
-    disableVertexAttribArray(index: number): void;
-    drawArrays(mode: number, first: number, count: number): void;
-    drawElements(mode: number, count: number, type: number, offset: number): void;
-    enable(cap: number): void;
-    enableVertexAttribArray(index: number): void;
-    finish(): void;
-    flush(): void;
-    framebufferRenderbuffer(target: number, attachment: number, renderbuffertarget: number, renderbuffer: WebGLRenderbuffer | null): void;
-    framebufferTexture2D(target: number, attachment: number, textarget: number, texture: WebGLTexture | null, level: number): void;
-    frontFace(mode: number): void;
-    generateMipmap(target: number): void;
-    getActiveAttrib(program: WebGLProgram | null, index: number): WebGLActiveInfo | null;
-    getActiveUniform(program: WebGLProgram | null, index: number): WebGLActiveInfo | null;
-    getAttachedShaders(program: WebGLProgram | null): WebGLShader[] | null;
-    getAttribLocation(program: WebGLProgram | null, name: string): number;
-    getBufferParameter(target: number, pname: number): any;
-    getContextAttributes(): WebGLContextAttributes;
-    getError(): number;
-    getExtension(extensionName: "EXT_blend_minmax"): EXT_blend_minmax | null;
-    getExtension(extensionName: "EXT_texture_filter_anisotropic"): EXT_texture_filter_anisotropic | null;
-    getExtension(extensionName: "EXT_frag_depth"): EXT_frag_depth | null;
-    getExtension(extensionName: "EXT_shader_texture_lod"): EXT_shader_texture_lod | null;
-    getExtension(extensionName: "EXT_sRGB"): EXT_sRGB | null;
-    getExtension(extensionName: "OES_vertex_array_object"): OES_vertex_array_object | null;
-    getExtension(extensionName: "WEBGL_color_buffer_float"): WEBGL_color_buffer_float | null;
-    getExtension(extensionName: "WEBGL_compressed_texture_astc"): WEBGL_compressed_texture_astc | null;
-    getExtension(extensionName: "WEBGL_compressed_texture_s3tc_srgb"): WEBGL_compressed_texture_s3tc_srgb | null;
-    getExtension(extensionName: "WEBGL_debug_shaders"): WEBGL_debug_shaders | null;
-    getExtension(extensionName: "WEBGL_draw_buffers"): WEBGL_draw_buffers | null;
-    getExtension(extensionName: "WEBGL_lose_context"): WEBGL_lose_context | null;
-    getExtension(extensionName: "WEBGL_depth_texture"): WEBGL_depth_texture | null;
-    getExtension(extensionName: "WEBGL_debug_renderer_info"): WEBGL_debug_renderer_info | null;
-    getExtension(extensionName: "WEBGL_compressed_texture_s3tc"): WEBGL_compressed_texture_s3tc | null;
-    getExtension(extensionName: "OES_texture_half_float_linear"): OES_texture_half_float_linear | null;
-    getExtension(extensionName: "OES_texture_half_float"): OES_texture_half_float | null;
-    getExtension(extensionName: "OES_texture_float_linear"): OES_texture_float_linear | null;
-    getExtension(extensionName: "OES_texture_float"): OES_texture_float | null;
-    getExtension(extensionName: "OES_standard_derivatives"): OES_standard_derivatives | null;
-    getExtension(extensionName: "OES_element_index_uint"): OES_element_index_uint | null;
-    getExtension(extensionName: "ANGLE_instanced_arrays"): ANGLE_instanced_arrays | null;
-    getExtension(extensionName: string): any;
-    getFramebufferAttachmentParameter(target: number, attachment: number, pname: number): any;
-    getParameter(pname: number): any;
-    getProgramInfoLog(program: WebGLProgram | null): string | null;
-    getProgramParameter(program: WebGLProgram | null, pname: number): any;
-    getRenderbufferParameter(target: number, pname: number): any;
-    getShaderInfoLog(shader: WebGLShader | null): string | null;
-    getShaderParameter(shader: WebGLShader | null, pname: number): any;
-    getShaderPrecisionFormat(shadertype: number, precisiontype: number): WebGLShaderPrecisionFormat | null;
-    getShaderSource(shader: WebGLShader | null): string | null;
-    getSupportedExtensions(): string[] | null;
-    getTexParameter(target: number, pname: number): any;
-    getUniform(program: WebGLProgram | null, location: WebGLUniformLocation | null): any;
-    getUniformLocation(program: WebGLProgram | null, name: string): WebGLUniformLocation | null;
-    getVertexAttrib(index: number, pname: number): any;
-    getVertexAttribOffset(index: number, pname: number): number;
-    hint(target: number, mode: number): void;
-    isBuffer(buffer: WebGLBuffer | null): boolean;
-    isContextLost(): boolean;
-    isEnabled(cap: number): boolean;
-    isFramebuffer(framebuffer: WebGLFramebuffer | null): boolean;
-    isProgram(program: WebGLProgram | null): boolean;
-    isRenderbuffer(renderbuffer: WebGLRenderbuffer | null): boolean;
-    isShader(shader: WebGLShader | null): boolean;
-    isTexture(texture: WebGLTexture | null): boolean;
-    lineWidth(width: number): void;
-    linkProgram(program: WebGLProgram | null): void;
-    pixelStorei(pname: number, param: number | boolean): void;
-    polygonOffset(factor: number, units: number): void;
-    readPixels(x: number, y: number, width: number, height: number, format: number, type: number, pixels: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | null): void;
-    renderbufferStorage(target: number, internalformat: number, width: number, height: number): void;
-    sampleCoverage(value: number, invert: boolean): void;
-    scissor(x: number, y: number, width: number, height: number): void;
-    shaderSource(shader: WebGLShader | null, source: string): void;
-    stencilFunc(func: number, ref: number, mask: number): void;
-    stencilFuncSeparate(face: number, func: number, ref: number, mask: number): void;
-    stencilMask(mask: number): void;
-    stencilMaskSeparate(face: number, mask: number): void;
-    stencilOp(fail: number, zfail: number, zpass: number): void;
-    stencilOpSeparate(face: number, fail: number, zfail: number, zpass: number): void;
-    texImage2D(target: number, level: number, internalformat: number, width: number, height: number, border: number, format: number, type: number, pixels: ArrayBufferView | null): void;
-    texImage2D(target: number, level: number, internalformat: number, format: number, type: number, pixels: ImageBitmap | ImageData | HTMLVideoElement | HTMLImageElement | HTMLCanvasElement): void;
-    texParameterf(target: number, pname: number, param: number): void;
-    texParameteri(target: number, pname: number, param: number): void;
-    texSubImage2D(target: number, level: number, xoffset: number, yoffset: number, width: number, height: number, format: number, type: number, pixels: ArrayBufferView | null): void;
-    texSubImage2D(target: number, level: number, xoffset: number, yoffset: number, format: number, type: number, pixels: ImageBitmap | ImageData | HTMLVideoElement | HTMLImageElement | HTMLCanvasElement): void;
-    uniform1f(location: WebGLUniformLocation | null, x: number): void;
-    uniform1fv(location: WebGLUniformLocation | null, v: Float32Array | ArrayLike<number>): void;
-    uniform1i(location: WebGLUniformLocation | null, x: number): void;
-    uniform1iv(location: WebGLUniformLocation | null, v: Int32Array | ArrayLike<number>): void;
-    uniform2f(location: WebGLUniformLocation | null, x: number, y: number): void;
-    uniform2fv(location: WebGLUniformLocation | null, v: Float32Array | ArrayLike<number>): void;
-    uniform2i(location: WebGLUniformLocation | null, x: number, y: number): void;
-    uniform2iv(location: WebGLUniformLocation | null, v: Int32Array | ArrayLike<number>): void;
-    uniform3f(location: WebGLUniformLocation | null, x: number, y: number, z: number): void;
-    uniform3fv(location: WebGLUniformLocation | null, v: Float32Array | ArrayLike<number>): void;
-    uniform3i(location: WebGLUniformLocation | null, x: number, y: number, z: number): void;
-    uniform3iv(location: WebGLUniformLocation | null, v: Int32Array | ArrayLike<number>): void;
-    uniform4f(location: WebGLUniformLocation | null, x: number, y: number, z: number, w: number): void;
-    uniform4fv(location: WebGLUniformLocation | null, v: Float32Array | ArrayLike<number>): void;
-    uniform4i(location: WebGLUniformLocation | null, x: number, y: number, z: number, w: number): void;
-    uniform4iv(location: WebGLUniformLocation | null, v: Int32Array | ArrayLike<number>): void;
-    uniformMatrix2fv(location: WebGLUniformLocation | null, transpose: boolean, value: Float32Array | ArrayLike<number>): void;
-    uniformMatrix3fv(location: WebGLUniformLocation | null, transpose: boolean, value: Float32Array | ArrayLike<number>): void;
-    uniformMatrix4fv(location: WebGLUniformLocation | null, transpose: boolean, value: Float32Array | ArrayLike<number>): void;
-    useProgram(program: WebGLProgram | null): void;
-    validateProgram(program: WebGLProgram | null): void;
-    vertexAttrib1f(indx: number, x: number): void;
-    vertexAttrib1fv(indx: number, values: Float32Array | number[]): void;
-    vertexAttrib2f(indx: number, x: number, y: number): void;
-    vertexAttrib2fv(indx: number, values: Float32Array | number[]): void;
-    vertexAttrib3f(indx: number, x: number, y: number, z: number): void;
-    vertexAttrib3fv(indx: number, values: Float32Array | number[]): void;
-    vertexAttrib4f(indx: number, x: number, y: number, z: number, w: number): void;
-    vertexAttrib4fv(indx: number, values: Float32Array | number[]): void;
-    vertexAttribPointer(indx: number, size: number, type: number, normalized: boolean, stride: number, offset: number): void;
-    viewport(x: number, y: number, width: number, height: number): void;
-    readonly ACTIVE_ATTRIBUTES: number;
-    readonly ACTIVE_TEXTURE: number;
-    readonly ACTIVE_UNIFORMS: number;
-    readonly ALIASED_LINE_WIDTH_RANGE: number;
-    readonly ALIASED_POINT_SIZE_RANGE: number;
-    readonly ALPHA: number;
-    readonly ALPHA_BITS: number;
-    readonly ALWAYS: number;
-    readonly ARRAY_BUFFER: number;
-    readonly ARRAY_BUFFER_BINDING: number;
-    readonly ATTACHED_SHADERS: number;
-    readonly BACK: number;
-    readonly BLEND: number;
-    readonly BLEND_COLOR: number;
-    readonly BLEND_DST_ALPHA: number;
-    readonly BLEND_DST_RGB: number;
-    readonly BLEND_EQUATION: number;
-    readonly BLEND_EQUATION_ALPHA: number;
-    readonly BLEND_EQUATION_RGB: number;
-    readonly BLEND_SRC_ALPHA: number;
-    readonly BLEND_SRC_RGB: number;
-    readonly BLUE_BITS: number;
-    readonly BOOL: number;
-    readonly BOOL_VEC2: number;
-    readonly BOOL_VEC3: number;
-    readonly BOOL_VEC4: number;
-    readonly BROWSER_DEFAULT_WEBGL: number;
-    readonly BUFFER_SIZE: number;
-    readonly BUFFER_USAGE: number;
-    readonly BYTE: number;
-    readonly CCW: number;
-    readonly CLAMP_TO_EDGE: number;
-    readonly COLOR_ATTACHMENT0: number;
-    readonly COLOR_BUFFER_BIT: number;
-    readonly COLOR_CLEAR_VALUE: number;
-    readonly COLOR_WRITEMASK: number;
-    readonly COMPILE_STATUS: number;
-    readonly COMPRESSED_TEXTURE_FORMATS: number;
-    readonly CONSTANT_ALPHA: number;
-    readonly CONSTANT_COLOR: number;
-    readonly CONTEXT_LOST_WEBGL: number;
-    readonly CULL_FACE: number;
-    readonly CULL_FACE_MODE: number;
-    readonly CURRENT_PROGRAM: number;
-    readonly CURRENT_VERTEX_ATTRIB: number;
-    readonly CW: number;
-    readonly DECR: number;
-    readonly DECR_WRAP: number;
-    readonly DELETE_STATUS: number;
-    readonly DEPTH_ATTACHMENT: number;
-    readonly DEPTH_BITS: number;
-    readonly DEPTH_BUFFER_BIT: number;
-    readonly DEPTH_CLEAR_VALUE: number;
-    readonly DEPTH_COMPONENT: number;
-    readonly DEPTH_COMPONENT16: number;
-    readonly DEPTH_FUNC: number;
-    readonly DEPTH_RANGE: number;
-    readonly DEPTH_STENCIL: number;
-    readonly DEPTH_STENCIL_ATTACHMENT: number;
-    readonly DEPTH_TEST: number;
-    readonly DEPTH_WRITEMASK: number;
-    readonly DITHER: number;
-    readonly DONT_CARE: number;
-    readonly DST_ALPHA: number;
-    readonly DST_COLOR: number;
-    readonly DYNAMIC_DRAW: number;
-    readonly ELEMENT_ARRAY_BUFFER: number;
-    readonly ELEMENT_ARRAY_BUFFER_BINDING: number;
-    readonly EQUAL: number;
-    readonly FASTEST: number;
-    readonly FLOAT: number;
-    readonly FLOAT_MAT2: number;
-    readonly FLOAT_MAT3: number;
-    readonly FLOAT_MAT4: number;
-    readonly FLOAT_VEC2: number;
-    readonly FLOAT_VEC3: number;
-    readonly FLOAT_VEC4: number;
-    readonly FRAGMENT_SHADER: number;
-    readonly FRAMEBUFFER: number;
-    readonly FRAMEBUFFER_ATTACHMENT_OBJECT_NAME: number;
-    readonly FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE: number;
-    readonly FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACE: number;
-    readonly FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL: number;
-    readonly FRAMEBUFFER_BINDING: number;
-    readonly FRAMEBUFFER_COMPLETE: number;
-    readonly FRAMEBUFFER_INCOMPLETE_ATTACHMENT: number;
-    readonly FRAMEBUFFER_INCOMPLETE_DIMENSIONS: number;
-    readonly FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT: number;
-    readonly FRAMEBUFFER_UNSUPPORTED: number;
-    readonly FRONT: number;
-    readonly FRONT_AND_BACK: number;
-    readonly FRONT_FACE: number;
-    readonly FUNC_ADD: number;
-    readonly FUNC_REVERSE_SUBTRACT: number;
-    readonly FUNC_SUBTRACT: number;
-    readonly GENERATE_MIPMAP_HINT: number;
-    readonly GEQUAL: number;
-    readonly GREATER: number;
-    readonly GREEN_BITS: number;
-    readonly HIGH_FLOAT: number;
-    readonly HIGH_INT: number;
-    readonly IMPLEMENTATION_COLOR_READ_FORMAT: number;
-    readonly IMPLEMENTATION_COLOR_READ_TYPE: number;
-    readonly INCR: number;
-    readonly INCR_WRAP: number;
-    readonly INT: number;
-    readonly INT_VEC2: number;
-    readonly INT_VEC3: number;
-    readonly INT_VEC4: number;
-    readonly INVALID_ENUM: number;
-    readonly INVALID_FRAMEBUFFER_OPERATION: number;
-    readonly INVALID_OPERATION: number;
-    readonly INVALID_VALUE: number;
-    readonly INVERT: number;
-    readonly KEEP: number;
-    readonly LEQUAL: number;
-    readonly LESS: number;
-    readonly LINEAR: number;
-    readonly LINEAR_MIPMAP_LINEAR: number;
-    readonly LINEAR_MIPMAP_NEAREST: number;
-    readonly LINES: number;
-    readonly LINE_LOOP: number;
-    readonly LINE_STRIP: number;
-    readonly LINE_WIDTH: number;
-    readonly LINK_STATUS: number;
-    readonly LOW_FLOAT: number;
-    readonly LOW_INT: number;
-    readonly LUMINANCE: number;
-    readonly LUMINANCE_ALPHA: number;
-    readonly MAX_COMBINED_TEXTURE_IMAGE_UNITS: number;
-    readonly MAX_CUBE_MAP_TEXTURE_SIZE: number;
-    readonly MAX_FRAGMENT_UNIFORM_VECTORS: number;
-    readonly MAX_RENDERBUFFER_SIZE: number;
-    readonly MAX_TEXTURE_IMAGE_UNITS: number;
-    readonly MAX_TEXTURE_SIZE: number;
-    readonly MAX_VARYING_VECTORS: number;
-    readonly MAX_VERTEX_ATTRIBS: number;
-    readonly MAX_VERTEX_TEXTURE_IMAGE_UNITS: number;
-    readonly MAX_VERTEX_UNIFORM_VECTORS: number;
-    readonly MAX_VIEWPORT_DIMS: number;
-    readonly MEDIUM_FLOAT: number;
-    readonly MEDIUM_INT: number;
-    readonly MIRRORED_REPEAT: number;
-    readonly NEAREST: number;
-    readonly NEAREST_MIPMAP_LINEAR: number;
-    readonly NEAREST_MIPMAP_NEAREST: number;
-    readonly NEVER: number;
-    readonly NICEST: number;
-    readonly NONE: number;
-    readonly NOTEQUAL: number;
-    readonly NO_ERROR: number;
-    readonly ONE: number;
-    readonly ONE_MINUS_CONSTANT_ALPHA: number;
-    readonly ONE_MINUS_CONSTANT_COLOR: number;
-    readonly ONE_MINUS_DST_ALPHA: number;
-    readonly ONE_MINUS_DST_COLOR: number;
-    readonly ONE_MINUS_SRC_ALPHA: number;
-    readonly ONE_MINUS_SRC_COLOR: number;
-    readonly OUT_OF_MEMORY: number;
-    readonly PACK_ALIGNMENT: number;
-    readonly POINTS: number;
-    readonly POLYGON_OFFSET_FACTOR: number;
-    readonly POLYGON_OFFSET_FILL: number;
-    readonly POLYGON_OFFSET_UNITS: number;
-    readonly RED_BITS: number;
-    readonly RENDERBUFFER: number;
-    readonly RENDERBUFFER_ALPHA_SIZE: number;
-    readonly RENDERBUFFER_BINDING: number;
-    readonly RENDERBUFFER_BLUE_SIZE: number;
-    readonly RENDERBUFFER_DEPTH_SIZE: number;
-    readonly RENDERBUFFER_GREEN_SIZE: number;
-    readonly RENDERBUFFER_HEIGHT: number;
-    readonly RENDERBUFFER_INTERNAL_FORMAT: number;
-    readonly RENDERBUFFER_RED_SIZE: number;
-    readonly RENDERBUFFER_STENCIL_SIZE: number;
-    readonly RENDERBUFFER_WIDTH: number;
-    readonly RENDERER: number;
-    readonly REPEAT: number;
-    readonly REPLACE: number;
-    readonly RGB: number;
-    readonly RGB565: number;
-    readonly RGB5_A1: number;
-    readonly RGBA: number;
-    readonly RGBA4: number;
-    readonly SAMPLER_2D: number;
-    readonly SAMPLER_CUBE: number;
-    readonly SAMPLES: number;
-    readonly SAMPLE_ALPHA_TO_COVERAGE: number;
-    readonly SAMPLE_BUFFERS: number;
-    readonly SAMPLE_COVERAGE: number;
-    readonly SAMPLE_COVERAGE_INVERT: number;
-    readonly SAMPLE_COVERAGE_VALUE: number;
-    readonly SCISSOR_BOX: number;
-    readonly SCISSOR_TEST: number;
-    readonly SHADER_TYPE: number;
-    readonly SHADING_LANGUAGE_VERSION: number;
-    readonly SHORT: number;
-    readonly SRC_ALPHA: number;
-    readonly SRC_ALPHA_SATURATE: number;
-    readonly SRC_COLOR: number;
-    readonly STATIC_DRAW: number;
-    readonly STENCIL_ATTACHMENT: number;
-    readonly STENCIL_BACK_FAIL: number;
-    readonly STENCIL_BACK_FUNC: number;
-    readonly STENCIL_BACK_PASS_DEPTH_FAIL: number;
-    readonly STENCIL_BACK_PASS_DEPTH_PASS: number;
-    readonly STENCIL_BACK_REF: number;
-    readonly STENCIL_BACK_VALUE_MASK: number;
-    readonly STENCIL_BACK_WRITEMASK: number;
-    readonly STENCIL_BITS: number;
-    readonly STENCIL_BUFFER_BIT: number;
-    readonly STENCIL_CLEAR_VALUE: number;
-    readonly STENCIL_FAIL: number;
-    readonly STENCIL_FUNC: number;
-    readonly STENCIL_INDEX: number;
-    readonly STENCIL_INDEX8: number;
-    readonly STENCIL_PASS_DEPTH_FAIL: number;
-    readonly STENCIL_PASS_DEPTH_PASS: number;
-    readonly STENCIL_REF: number;
-    readonly STENCIL_TEST: number;
-    readonly STENCIL_VALUE_MASK: number;
-    readonly STENCIL_WRITEMASK: number;
-    readonly STREAM_DRAW: number;
-    readonly SUBPIXEL_BITS: number;
-    readonly TEXTURE: number;
-    readonly TEXTURE0: number;
-    readonly TEXTURE1: number;
-    readonly TEXTURE10: number;
-    readonly TEXTURE11: number;
-    readonly TEXTURE12: number;
-    readonly TEXTURE13: number;
-    readonly TEXTURE14: number;
-    readonly TEXTURE15: number;
-    readonly TEXTURE16: number;
-    readonly TEXTURE17: number;
-    readonly TEXTURE18: number;
-    readonly TEXTURE19: number;
-    readonly TEXTURE2: number;
-    readonly TEXTURE20: number;
-    readonly TEXTURE21: number;
-    readonly TEXTURE22: number;
-    readonly TEXTURE23: number;
-    readonly TEXTURE24: number;
-    readonly TEXTURE25: number;
-    readonly TEXTURE26: number;
-    readonly TEXTURE27: number;
-    readonly TEXTURE28: number;
-    readonly TEXTURE29: number;
-    readonly TEXTURE3: number;
-    readonly TEXTURE30: number;
-    readonly TEXTURE31: number;
-    readonly TEXTURE4: number;
-    readonly TEXTURE5: number;
-    readonly TEXTURE6: number;
-    readonly TEXTURE7: number;
-    readonly TEXTURE8: number;
-    readonly TEXTURE9: number;
-    readonly TEXTURE_2D: number;
-    readonly TEXTURE_BINDING_2D: number;
-    readonly TEXTURE_BINDING_CUBE_MAP: number;
-    readonly TEXTURE_CUBE_MAP: number;
-    readonly TEXTURE_CUBE_MAP_NEGATIVE_X: number;
-    readonly TEXTURE_CUBE_MAP_NEGATIVE_Y: number;
-    readonly TEXTURE_CUBE_MAP_NEGATIVE_Z: number;
-    readonly TEXTURE_CUBE_MAP_POSITIVE_X: number;
-    readonly TEXTURE_CUBE_MAP_POSITIVE_Y: number;
-    readonly TEXTURE_CUBE_MAP_POSITIVE_Z: number;
-    readonly TEXTURE_MAG_FILTER: number;
-    readonly TEXTURE_MIN_FILTER: number;
-    readonly TEXTURE_WRAP_S: number;
-    readonly TEXTURE_WRAP_T: number;
-    readonly TRIANGLES: number;
-    readonly TRIANGLE_FAN: number;
-    readonly TRIANGLE_STRIP: number;
-    readonly UNPACK_ALIGNMENT: number;
-    readonly UNPACK_COLORSPACE_CONVERSION_WEBGL: number;
-    readonly UNPACK_FLIP_Y_WEBGL: number;
-    readonly UNPACK_PREMULTIPLY_ALPHA_WEBGL: number;
-    readonly UNSIGNED_BYTE: number;
-    readonly UNSIGNED_INT: number;
-    readonly UNSIGNED_SHORT: number;
-    readonly UNSIGNED_SHORT_4_4_4_4: number;
-    readonly UNSIGNED_SHORT_5_5_5_1: number;
-    readonly UNSIGNED_SHORT_5_6_5: number;
-    readonly VALIDATE_STATUS: number;
-    readonly VENDOR: number;
-    readonly VERSION: number;
-    readonly VERTEX_ATTRIB_ARRAY_BUFFER_BINDING: number;
-    readonly VERTEX_ATTRIB_ARRAY_ENABLED: number;
-    readonly VERTEX_ATTRIB_ARRAY_NORMALIZED: number;
-    readonly VERTEX_ATTRIB_ARRAY_POINTER: number;
-    readonly VERTEX_ATTRIB_ARRAY_SIZE: number;
-    readonly VERTEX_ATTRIB_ARRAY_STRIDE: number;
-    readonly VERTEX_ATTRIB_ARRAY_TYPE: number;
-    readonly VERTEX_SHADER: number;
-    readonly VIEWPORT: number;
-    readonly ZERO: number;
-}
-
-declare var WebGLRenderingContext: {
-    prototype: WebGLRenderingContext;
-    new(): WebGLRenderingContext;
-    readonly ACTIVE_ATTRIBUTES: number;
-    readonly ACTIVE_TEXTURE: number;
-    readonly ACTIVE_UNIFORMS: number;
-    readonly ALIASED_LINE_WIDTH_RANGE: number;
-    readonly ALIASED_POINT_SIZE_RANGE: number;
-    readonly ALPHA: number;
-    readonly ALPHA_BITS: number;
-    readonly ALWAYS: number;
-    readonly ARRAY_BUFFER: number;
-    readonly ARRAY_BUFFER_BINDING: number;
-    readonly ATTACHED_SHADERS: number;
-    readonly BACK: number;
-    readonly BLEND: number;
-    readonly BLEND_COLOR: number;
-    readonly BLEND_DST_ALPHA: number;
-    readonly BLEND_DST_RGB: number;
-    readonly BLEND_EQUATION: number;
-    readonly BLEND_EQUATION_ALPHA: number;
-    readonly BLEND_EQUATION_RGB: number;
-    readonly BLEND_SRC_ALPHA: number;
-    readonly BLEND_SRC_RGB: number;
-    readonly BLUE_BITS: number;
-    readonly BOOL: number;
-    readonly BOOL_VEC2: number;
-    readonly BOOL_VEC3: number;
-    readonly BOOL_VEC4: number;
-    readonly BROWSER_DEFAULT_WEBGL: number;
-    readonly BUFFER_SIZE: number;
-    readonly BUFFER_USAGE: number;
-    readonly BYTE: number;
-    readonly CCW: number;
-    readonly CLAMP_TO_EDGE: number;
-    readonly COLOR_ATTACHMENT0: number;
-    readonly COLOR_BUFFER_BIT: number;
-    readonly COLOR_CLEAR_VALUE: number;
-    readonly COLOR_WRITEMASK: number;
-    readonly COMPILE_STATUS: number;
-    readonly COMPRESSED_TEXTURE_FORMATS: number;
-    readonly CONSTANT_ALPHA: number;
-    readonly CONSTANT_COLOR: number;
-    readonly CONTEXT_LOST_WEBGL: number;
-    readonly CULL_FACE: number;
-    readonly CULL_FACE_MODE: number;
-    readonly CURRENT_PROGRAM: number;
-    readonly CURRENT_VERTEX_ATTRIB: number;
-    readonly CW: number;
-    readonly DECR: number;
-    readonly DECR_WRAP: number;
-    readonly DELETE_STATUS: number;
-    readonly DEPTH_ATTACHMENT: number;
-    readonly DEPTH_BITS: number;
-    readonly DEPTH_BUFFER_BIT: number;
-    readonly DEPTH_CLEAR_VALUE: number;
-    readonly DEPTH_COMPONENT: number;
-    readonly DEPTH_COMPONENT16: number;
-    readonly DEPTH_FUNC: number;
-    readonly DEPTH_RANGE: number;
-    readonly DEPTH_STENCIL: number;
-    readonly DEPTH_STENCIL_ATTACHMENT: number;
-    readonly DEPTH_TEST: number;
-    readonly DEPTH_WRITEMASK: number;
-    readonly DITHER: number;
-    readonly DONT_CARE: number;
-    readonly DST_ALPHA: number;
-    readonly DST_COLOR: number;
-    readonly DYNAMIC_DRAW: number;
-    readonly ELEMENT_ARRAY_BUFFER: number;
-    readonly ELEMENT_ARRAY_BUFFER_BINDING: number;
-    readonly EQUAL: number;
-    readonly FASTEST: number;
-    readonly FLOAT: number;
-    readonly FLOAT_MAT2: number;
-    readonly FLOAT_MAT3: number;
-    readonly FLOAT_MAT4: number;
-    readonly FLOAT_VEC2: number;
-    readonly FLOAT_VEC3: number;
-    readonly FLOAT_VEC4: number;
-    readonly FRAGMENT_SHADER: number;
-    readonly FRAMEBUFFER: number;
-    readonly FRAMEBUFFER_ATTACHMENT_OBJECT_NAME: number;
-    readonly FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE: number;
-    readonly FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACE: number;
-    readonly FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL: number;
-    readonly FRAMEBUFFER_BINDING: number;
-    readonly FRAMEBUFFER_COMPLETE: number;
-    readonly FRAMEBUFFER_INCOMPLETE_ATTACHMENT: number;
-    readonly FRAMEBUFFER_INCOMPLETE_DIMENSIONS: number;
-    readonly FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT: number;
-    readonly FRAMEBUFFER_UNSUPPORTED: number;
-    readonly FRONT: number;
-    readonly FRONT_AND_BACK: number;
-    readonly FRONT_FACE: number;
-    readonly FUNC_ADD: number;
-    readonly FUNC_REVERSE_SUBTRACT: number;
-    readonly FUNC_SUBTRACT: number;
-    readonly GENERATE_MIPMAP_HINT: number;
-    readonly GEQUAL: number;
-    readonly GREATER: number;
-    readonly GREEN_BITS: number;
-    readonly HIGH_FLOAT: number;
-    readonly HIGH_INT: number;
-    readonly IMPLEMENTATION_COLOR_READ_FORMAT: number;
-    readonly IMPLEMENTATION_COLOR_READ_TYPE: number;
-    readonly INCR: number;
-    readonly INCR_WRAP: number;
-    readonly INT: number;
-    readonly INT_VEC2: number;
-    readonly INT_VEC3: number;
-    readonly INT_VEC4: number;
-    readonly INVALID_ENUM: number;
-    readonly INVALID_FRAMEBUFFER_OPERATION: number;
-    readonly INVALID_OPERATION: number;
-    readonly INVALID_VALUE: number;
-    readonly INVERT: number;
-    readonly KEEP: number;
-    readonly LEQUAL: number;
-    readonly LESS: number;
-    readonly LINEAR: number;
-    readonly LINEAR_MIPMAP_LINEAR: number;
-    readonly LINEAR_MIPMAP_NEAREST: number;
-    readonly LINES: number;
-    readonly LINE_LOOP: number;
-    readonly LINE_STRIP: number;
-    readonly LINE_WIDTH: number;
-    readonly LINK_STATUS: number;
-    readonly LOW_FLOAT: number;
-    readonly LOW_INT: number;
-    readonly LUMINANCE: number;
-    readonly LUMINANCE_ALPHA: number;
-    readonly MAX_COMBINED_TEXTURE_IMAGE_UNITS: number;
-    readonly MAX_CUBE_MAP_TEXTURE_SIZE: number;
-    readonly MAX_FRAGMENT_UNIFORM_VECTORS: number;
-    readonly MAX_RENDERBUFFER_SIZE: number;
-    readonly MAX_TEXTURE_IMAGE_UNITS: number;
-    readonly MAX_TEXTURE_SIZE: number;
-    readonly MAX_VARYING_VECTORS: number;
-    readonly MAX_VERTEX_ATTRIBS: number;
-    readonly MAX_VERTEX_TEXTURE_IMAGE_UNITS: number;
-    readonly MAX_VERTEX_UNIFORM_VECTORS: number;
-    readonly MAX_VIEWPORT_DIMS: number;
-    readonly MEDIUM_FLOAT: number;
-    readonly MEDIUM_INT: number;
-    readonly MIRRORED_REPEAT: number;
-    readonly NEAREST: number;
-    readonly NEAREST_MIPMAP_LINEAR: number;
-    readonly NEAREST_MIPMAP_NEAREST: number;
-    readonly NEVER: number;
-    readonly NICEST: number;
-    readonly NONE: number;
-    readonly NOTEQUAL: number;
-    readonly NO_ERROR: number;
-    readonly ONE: number;
-    readonly ONE_MINUS_CONSTANT_ALPHA: number;
-    readonly ONE_MINUS_CONSTANT_COLOR: number;
-    readonly ONE_MINUS_DST_ALPHA: number;
-    readonly ONE_MINUS_DST_COLOR: number;
-    readonly ONE_MINUS_SRC_ALPHA: number;
-    readonly ONE_MINUS_SRC_COLOR: number;
-    readonly OUT_OF_MEMORY: number;
-    readonly PACK_ALIGNMENT: number;
-    readonly POINTS: number;
-    readonly POLYGON_OFFSET_FACTOR: number;
-    readonly POLYGON_OFFSET_FILL: number;
-    readonly POLYGON_OFFSET_UNITS: number;
-    readonly RED_BITS: number;
-    readonly RENDERBUFFER: number;
-    readonly RENDERBUFFER_ALPHA_SIZE: number;
-    readonly RENDERBUFFER_BINDING: number;
-    readonly RENDERBUFFER_BLUE_SIZE: number;
-    readonly RENDERBUFFER_DEPTH_SIZE: number;
-    readonly RENDERBUFFER_GREEN_SIZE: number;
-    readonly RENDERBUFFER_HEIGHT: number;
-    readonly RENDERBUFFER_INTERNAL_FORMAT: number;
-    readonly RENDERBUFFER_RED_SIZE: number;
-    readonly RENDERBUFFER_STENCIL_SIZE: number;
-    readonly RENDERBUFFER_WIDTH: number;
-    readonly RENDERER: number;
-    readonly REPEAT: number;
-    readonly REPLACE: number;
-    readonly RGB: number;
-    readonly RGB565: number;
-    readonly RGB5_A1: number;
-    readonly RGBA: number;
-    readonly RGBA4: number;
-    readonly SAMPLER_2D: number;
-    readonly SAMPLER_CUBE: number;
-    readonly SAMPLES: number;
-    readonly SAMPLE_ALPHA_TO_COVERAGE: number;
-    readonly SAMPLE_BUFFERS: number;
-    readonly SAMPLE_COVERAGE: number;
-    readonly SAMPLE_COVERAGE_INVERT: number;
-    readonly SAMPLE_COVERAGE_VALUE: number;
-    readonly SCISSOR_BOX: number;
-    readonly SCISSOR_TEST: number;
-    readonly SHADER_TYPE: number;
-    readonly SHADING_LANGUAGE_VERSION: number;
-    readonly SHORT: number;
-    readonly SRC_ALPHA: number;
-    readonly SRC_ALPHA_SATURATE: number;
-    readonly SRC_COLOR: number;
-    readonly STATIC_DRAW: number;
-    readonly STENCIL_ATTACHMENT: number;
-    readonly STENCIL_BACK_FAIL: number;
-    readonly STENCIL_BACK_FUNC: number;
-    readonly STENCIL_BACK_PASS_DEPTH_FAIL: number;
-    readonly STENCIL_BACK_PASS_DEPTH_PASS: number;
-    readonly STENCIL_BACK_REF: number;
-    readonly STENCIL_BACK_VALUE_MASK: number;
-    readonly STENCIL_BACK_WRITEMASK: number;
-    readonly STENCIL_BITS: number;
-    readonly STENCIL_BUFFER_BIT: number;
-    readonly STENCIL_CLEAR_VALUE: number;
-    readonly STENCIL_FAIL: number;
-    readonly STENCIL_FUNC: number;
-    readonly STENCIL_INDEX: number;
-    readonly STENCIL_INDEX8: number;
-    readonly STENCIL_PASS_DEPTH_FAIL: number;
-    readonly STENCIL_PASS_DEPTH_PASS: number;
-    readonly STENCIL_REF: number;
-    readonly STENCIL_TEST: number;
-    readonly STENCIL_VALUE_MASK: number;
-    readonly STENCIL_WRITEMASK: number;
-    readonly STREAM_DRAW: number;
-    readonly SUBPIXEL_BITS: number;
-    readonly TEXTURE: number;
-    readonly TEXTURE0: number;
-    readonly TEXTURE1: number;
-    readonly TEXTURE10: number;
-    readonly TEXTURE11: number;
-    readonly TEXTURE12: number;
-    readonly TEXTURE13: number;
-    readonly TEXTURE14: number;
-    readonly TEXTURE15: number;
-    readonly TEXTURE16: number;
-    readonly TEXTURE17: number;
-    readonly TEXTURE18: number;
-    readonly TEXTURE19: number;
-    readonly TEXTURE2: number;
-    readonly TEXTURE20: number;
-    readonly TEXTURE21: number;
-    readonly TEXTURE22: number;
-    readonly TEXTURE23: number;
-    readonly TEXTURE24: number;
-    readonly TEXTURE25: number;
-    readonly TEXTURE26: number;
-    readonly TEXTURE27: number;
-    readonly TEXTURE28: number;
-    readonly TEXTURE29: number;
-    readonly TEXTURE3: number;
-    readonly TEXTURE30: number;
-    readonly TEXTURE31: number;
-    readonly TEXTURE4: number;
-    readonly TEXTURE5: number;
-    readonly TEXTURE6: number;
-    readonly TEXTURE7: number;
-    readonly TEXTURE8: number;
-    readonly TEXTURE9: number;
-    readonly TEXTURE_2D: number;
-    readonly TEXTURE_BINDING_2D: number;
-    readonly TEXTURE_BINDING_CUBE_MAP: number;
-    readonly TEXTURE_CUBE_MAP: number;
-    readonly TEXTURE_CUBE_MAP_NEGATIVE_X: number;
-    readonly TEXTURE_CUBE_MAP_NEGATIVE_Y: number;
-    readonly TEXTURE_CUBE_MAP_NEGATIVE_Z: number;
-    readonly TEXTURE_CUBE_MAP_POSITIVE_X: number;
-    readonly TEXTURE_CUBE_MAP_POSITIVE_Y: number;
-    readonly TEXTURE_CUBE_MAP_POSITIVE_Z: number;
-    readonly TEXTURE_MAG_FILTER: number;
-    readonly TEXTURE_MIN_FILTER: number;
-    readonly TEXTURE_WRAP_S: number;
-    readonly TEXTURE_WRAP_T: number;
-    readonly TRIANGLES: number;
-    readonly TRIANGLE_FAN: number;
-    readonly TRIANGLE_STRIP: number;
-    readonly UNPACK_ALIGNMENT: number;
-    readonly UNPACK_COLORSPACE_CONVERSION_WEBGL: number;
-    readonly UNPACK_FLIP_Y_WEBGL: number;
-    readonly UNPACK_PREMULTIPLY_ALPHA_WEBGL: number;
-    readonly UNSIGNED_BYTE: number;
-    readonly UNSIGNED_INT: number;
-    readonly UNSIGNED_SHORT: number;
-    readonly UNSIGNED_SHORT_4_4_4_4: number;
-    readonly UNSIGNED_SHORT_5_5_5_1: number;
-    readonly UNSIGNED_SHORT_5_6_5: number;
-    readonly VALIDATE_STATUS: number;
-    readonly VENDOR: number;
-    readonly VERSION: number;
-    readonly VERTEX_ATTRIB_ARRAY_BUFFER_BINDING: number;
-    readonly VERTEX_ATTRIB_ARRAY_ENABLED: number;
-    readonly VERTEX_ATTRIB_ARRAY_NORMALIZED: number;
-    readonly VERTEX_ATTRIB_ARRAY_POINTER: number;
-    readonly VERTEX_ATTRIB_ARRAY_SIZE: number;
-    readonly VERTEX_ATTRIB_ARRAY_STRIDE: number;
-    readonly VERTEX_ATTRIB_ARRAY_TYPE: number;
-    readonly VERTEX_SHADER: number;
-    readonly VIEWPORT: number;
-    readonly ZERO: number;
-};
-
-interface WebGLShader extends WebGLObject {
-}
-
-declare var WebGLShader: {
-    prototype: WebGLShader;
-    new(): WebGLShader;
-};
-
-interface WebGLShaderPrecisionFormat {
-    readonly precision: number;
-    readonly rangeMax: number;
-    readonly rangeMin: number;
-}
-
-declare var WebGLShaderPrecisionFormat: {
-    prototype: WebGLShaderPrecisionFormat;
-    new(): WebGLShaderPrecisionFormat;
-};
-
-interface WebGLTexture extends WebGLObject {
-}
-
-declare var WebGLTexture: {
-    prototype: WebGLTexture;
-    new(): WebGLTexture;
-};
-
-interface WebGLUniformLocation {
-}
-
-declare var WebGLUniformLocation: {
-    prototype: WebGLUniformLocation;
-    new(): WebGLUniformLocation;
-};
-
-interface WebGLVertexArrayObjectOES {
-}
-
-interface WebKitCSSMatrix {
-    a: number;
-    b: number;
-    c: number;
-    d: number;
-    e: number;
-    f: number;
-    m11: number;
-    m12: number;
-    m13: number;
-    m14: number;
-    m21: number;
-    m22: number;
-    m23: number;
-    m24: number;
-    m31: number;
-    m32: number;
-    m33: number;
-    m34: number;
-    m41: number;
-    m42: number;
-    m43: number;
-    m44: number;
-    inverse(): WebKitCSSMatrix;
-    multiply(secondMatrix: WebKitCSSMatrix): WebKitCSSMatrix;
-    rotate(angleX: number, angleY?: number, angleZ?: number): WebKitCSSMatrix;
-    rotateAxisAngle(x: number, y: number, z: number, angle: number): WebKitCSSMatrix;
-    scale(scaleX: number, scaleY?: number, scaleZ?: number): WebKitCSSMatrix;
-    setMatrixValue(value: string): void;
-    skewX(angle: number): WebKitCSSMatrix;
-    skewY(angle: number): WebKitCSSMatrix;
-    toString(): string;
-    translate(x: number, y: number, z?: number): WebKitCSSMatrix;
-}
-
-declare var WebKitCSSMatrix: {
-    prototype: WebKitCSSMatrix;
-    new(text?: string): WebKitCSSMatrix;
-};
-
-interface WebKitDirectoryEntry extends WebKitEntry {
-    createReader(): WebKitDirectoryReader;
-}
-
-declare var WebKitDirectoryEntry: {
-    prototype: WebKitDirectoryEntry;
-    new(): WebKitDirectoryEntry;
-};
-
-interface WebKitDirectoryReader {
-    readEntries(successCallback: WebKitEntriesCallback, errorCallback?: WebKitErrorCallback): void;
-}
-
-declare var WebKitDirectoryReader: {
-    prototype: WebKitDirectoryReader;
-    new(): WebKitDirectoryReader;
-};
-
-interface WebKitEntry {
-    readonly filesystem: WebKitFileSystem;
-    readonly fullPath: string;
-    readonly isDirectory: boolean;
-    readonly isFile: boolean;
-    readonly name: string;
-}
-
-declare var WebKitEntry: {
-    prototype: WebKitEntry;
-    new(): WebKitEntry;
-};
-
-interface WebKitFileEntry extends WebKitEntry {
-    file(successCallback: WebKitFileCallback, errorCallback?: WebKitErrorCallback): void;
-}
-
-declare var WebKitFileEntry: {
-    prototype: WebKitFileEntry;
-    new(): WebKitFileEntry;
-};
-
-interface WebKitFileSystem {
-    readonly name: string;
-    readonly root: WebKitDirectoryEntry;
-}
-
-declare var WebKitFileSystem: {
-    prototype: WebKitFileSystem;
-    new(): WebKitFileSystem;
-};
-
-interface WebKitPoint {
-    x: number;
-    y: number;
-}
-
-declare var WebKitPoint: {
-    prototype: WebKitPoint;
-    new(x?: number, y?: number): WebKitPoint;
-};
-
-interface WebSocketEventMap {
-    "close": CloseEvent;
-    "error": Event;
-    "message": MessageEvent;
-    "open": Event;
-}
-
-interface WebSocket extends EventTarget {
-    binaryType: BinaryType;
-    readonly bufferedAmount: number;
-    readonly extensions: string;
-    onclose: ((this: WebSocket, ev: CloseEvent) => any) | null;
-    onerror: ((this: WebSocket, ev: Event) => any) | null;
-    onmessage: ((this: WebSocket, ev: MessageEvent) => any) | null;
-    onopen: ((this: WebSocket, ev: Event) => any) | null;
-    readonly protocol: string;
-    readonly readyState: number;
-    readonly url: string;
-    close(code?: number, reason?: string): void;
-    send(data: string | ArrayBufferLike | Blob | ArrayBufferView): void;
-    readonly CLOSED: number;
-    readonly CLOSING: number;
-    readonly CONNECTING: number;
-    readonly OPEN: number;
-    addEventListener<K extends keyof WebSocketEventMap>(type: K, listener: (this: WebSocket, ev: WebSocketEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof WebSocketEventMap>(type: K, listener: (this: WebSocket, ev: WebSocketEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var WebSocket: {
-    prototype: WebSocket;
-    new(url: string, protocols?: string | string[]): WebSocket;
-    readonly CLOSED: number;
-    readonly CLOSING: number;
-    readonly CONNECTING: number;
-    readonly OPEN: number;
-};
-
-interface WheelEvent extends MouseEvent {
-    readonly deltaMode: number;
-    readonly deltaX: number;
-    readonly deltaY: number;
-    readonly deltaZ: number;
-    readonly wheelDelta: number;
-    readonly wheelDeltaX: number;
-    readonly wheelDeltaY: number;
-    getCurrentPoint(element: Element): void;
-    initWheelEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number, screenXArg: number, screenYArg: number, clientXArg: number, clientYArg: number, buttonArg: number, relatedTargetArg: EventTarget, modifiersListArg: string, deltaXArg: number, deltaYArg: number, deltaZArg: number, deltaMode: number): void;
-    readonly DOM_DELTA_LINE: number;
-    readonly DOM_DELTA_PAGE: number;
-    readonly DOM_DELTA_PIXEL: number;
-}
-
-declare var WheelEvent: {
-    prototype: WheelEvent;
-    new(typeArg: string, eventInitDict?: WheelEventInit): WheelEvent;
-    readonly DOM_DELTA_LINE: number;
-    readonly DOM_DELTA_PAGE: number;
-    readonly DOM_DELTA_PIXEL: number;
-};
-
-interface WindowEventMap extends GlobalEventHandlersEventMap {
-    "abort": UIEvent;
-    "afterprint": Event;
-    "beforeprint": Event;
-    "beforeunload": BeforeUnloadEvent;
-    "blur": FocusEvent;
-    "canplay": Event;
-    "canplaythrough": Event;
-    "change": Event;
-    "click": MouseEvent;
-    "compassneedscalibration": Event;
-    "contextmenu": PointerEvent;
-    "dblclick": MouseEvent;
-    "devicelight": DeviceLightEvent;
-    "devicemotion": DeviceMotionEvent;
-    "deviceorientation": DeviceOrientationEvent;
-    "drag": DragEvent;
-    "dragend": DragEvent;
-    "dragenter": DragEvent;
-    "dragleave": DragEvent;
-    "dragover": DragEvent;
-    "dragstart": DragEvent;
-    "drop": DragEvent;
-    "durationchange": Event;
-    "emptied": Event;
-    "ended": Event;
-    "error": ErrorEvent;
-    "focus": FocusEvent;
-    "hashchange": HashChangeEvent;
-    "input": Event;
-    "invalid": Event;
-    "keydown": KeyboardEvent;
-    "keypress": KeyboardEvent;
-    "keyup": KeyboardEvent;
-    "load": Event;
-    "loadeddata": Event;
-    "loadedmetadata": Event;
-    "loadstart": Event;
-    "message": MessageEvent;
-    "mousedown": MouseEvent;
-    "mouseenter": MouseEvent;
-    "mouseleave": MouseEvent;
-    "mousemove": MouseEvent;
-    "mouseout": MouseEvent;
-    "mouseover": MouseEvent;
-    "mouseup": MouseEvent;
-    "mousewheel": WheelEvent;
-    "MSGestureChange": Event;
-    "MSGestureDoubleTap": Event;
-    "MSGestureEnd": Event;
-    "MSGestureHold": Event;
-    "MSGestureStart": Event;
-    "MSGestureTap": Event;
-    "MSInertiaStart": Event;
-    "MSPointerCancel": Event;
-    "MSPointerDown": Event;
-    "MSPointerEnter": Event;
-    "MSPointerLeave": Event;
-    "MSPointerMove": Event;
-    "MSPointerOut": Event;
-    "MSPointerOver": Event;
-    "MSPointerUp": Event;
-    "offline": Event;
-    "online": Event;
-    "orientationchange": Event;
-    "pagehide": PageTransitionEvent;
-    "pageshow": PageTransitionEvent;
-    "pause": Event;
-    "play": Event;
-    "playing": Event;
-    "popstate": PopStateEvent;
-    "progress": ProgressEvent;
-    "ratechange": Event;
-    "readystatechange": ProgressEvent;
-    "reset": Event;
-    "resize": UIEvent;
-    "scroll": UIEvent;
-    "seeked": Event;
-    "seeking": Event;
-    "select": UIEvent;
-    "stalled": Event;
-    "storage": StorageEvent;
-    "submit": Event;
-    "suspend": Event;
-    "timeupdate": Event;
-    "touchcancel": TouchEvent;
-    "touchend": TouchEvent;
-    "touchmove": TouchEvent;
-    "touchstart": TouchEvent;
-    "unload": Event;
-    "volumechange": Event;
-    "vrdisplayactivate": Event;
-    "vrdisplayblur": Event;
-    "vrdisplayconnect": Event;
-    "vrdisplaydeactivate": Event;
-    "vrdisplaydisconnect": Event;
-    "vrdisplayfocus": Event;
-    "vrdisplaypointerrestricted": Event;
-    "vrdisplaypointerunrestricted": Event;
-    "vrdisplaypresentchange": Event;
-    "waiting": Event;
-}
-
-interface Window extends EventTarget, WindowTimers, WindowSessionStorage, WindowLocalStorage, WindowConsole, GlobalEventHandlers, IDBEnvironment, WindowBase64, GlobalFetch {
-    Blob: typeof Blob;
-    URL: typeof URL;
-    URLSearchParams: typeof URLSearchParams;
-    readonly applicationCache: ApplicationCache;
-    readonly caches: CacheStorage;
-    readonly clientInformation: Navigator;
-    readonly closed: boolean;
-    readonly crypto: Crypto;
-    customElements: CustomElementRegistry;
-    defaultStatus: string;
-    readonly devicePixelRatio: number;
-    readonly doNotTrack: string;
-    readonly document: Document;
-    event: Event | undefined;
-    readonly external: External;
-    readonly frameElement: Element;
-    readonly frames: Window;
-    readonly history: History;
-    readonly innerHeight: number;
-    readonly innerWidth: number;
-    readonly isSecureContext: boolean;
-    readonly length: number;
-    location: Location;
-    readonly locationbar: BarProp;
-    readonly menubar: BarProp;
-    readonly msContentScript: ExtensionScriptApis;
-    readonly msCredentials: MSCredentials;
-    name: string;
-    readonly navigator: Navigator;
-    offscreenBuffering: string | boolean;
-    onabort: ((this: Window, ev: UIEvent) => any) | null;
-    onafterprint: ((this: Window, ev: Event) => any) | null;
-    onbeforeprint: ((this: Window, ev: Event) => any) | null;
-    onbeforeunload: ((this: Window, ev: BeforeUnloadEvent) => any) | null;
-    onblur: ((this: Window, ev: FocusEvent) => any) | null;
-    oncanplay: ((this: Window, ev: Event) => any) | null;
-    oncanplaythrough: ((this: Window, ev: Event) => any) | null;
-    onchange: ((this: Window, ev: Event) => any) | null;
-    onclick: ((this: Window, ev: MouseEvent) => any) | null;
-    oncompassneedscalibration: ((this: Window, ev: Event) => any) | null;
-    oncontextmenu: ((this: Window, ev: PointerEvent) => any) | null;
-    ondblclick: ((this: Window, ev: MouseEvent) => any) | null;
-    ondevicelight: ((this: Window, ev: DeviceLightEvent) => any) | null;
-    ondevicemotion: ((this: Window, ev: DeviceMotionEvent) => any) | null;
-    ondeviceorientation: ((this: Window, ev: DeviceOrientationEvent) => any) | null;
-    ondrag: ((this: Window, ev: DragEvent) => any) | null;
-    ondragend: ((this: Window, ev: DragEvent) => any) | null;
-    ondragenter: ((this: Window, ev: DragEvent) => any) | null;
-    ondragleave: ((this: Window, ev: DragEvent) => any) | null;
-    ondragover: ((this: Window, ev: DragEvent) => any) | null;
-    ondragstart: ((this: Window, ev: DragEvent) => any) | null;
-    ondrop: ((this: Window, ev: DragEvent) => any) | null;
-    ondurationchange: ((this: Window, ev: Event) => any) | null;
-    onemptied: ((this: Window, ev: Event) => any) | null;
-    onended: ((this: Window, ev: Event) => any) | null;
-    onerror: ErrorEventHandler;
-    onfocus: ((this: Window, ev: FocusEvent) => any) | null;
-    onhashchange: ((this: Window, ev: HashChangeEvent) => any) | null;
-    oninput: ((this: Window, ev: Event) => any) | null;
-    oninvalid: ((this: Window, ev: Event) => any) | null;
-    onkeydown: ((this: Window, ev: KeyboardEvent) => any) | null;
-    onkeypress: ((this: Window, ev: KeyboardEvent) => any) | null;
-    onkeyup: ((this: Window, ev: KeyboardEvent) => any) | null;
-    onload: ((this: Window, ev: Event) => any) | null;
-    onloadeddata: ((this: Window, ev: Event) => any) | null;
-    onloadedmetadata: ((this: Window, ev: Event) => any) | null;
-    onloadstart: ((this: Window, ev: Event) => any) | null;
-    onmessage: ((this: Window, ev: MessageEvent) => any) | null;
-    onmousedown: ((this: Window, ev: MouseEvent) => any) | null;
-    onmouseenter: ((this: Window, ev: MouseEvent) => any) | null;
-    onmouseleave: ((this: Window, ev: MouseEvent) => any) | null;
-    onmousemove: ((this: Window, ev: MouseEvent) => any) | null;
-    onmouseout: ((this: Window, ev: MouseEvent) => any) | null;
-    onmouseover: ((this: Window, ev: MouseEvent) => any) | null;
-    onmouseup: ((this: Window, ev: MouseEvent) => any) | null;
-    onmousewheel: ((this: Window, ev: WheelEvent) => any) | null;
-    onmsgesturechange: ((this: Window, ev: Event) => any) | null;
-    onmsgesturedoubletap: ((this: Window, ev: Event) => any) | null;
-    onmsgestureend: ((this: Window, ev: Event) => any) | null;
-    onmsgesturehold: ((this: Window, ev: Event) => any) | null;
-    onmsgesturestart: ((this: Window, ev: Event) => any) | null;
-    onmsgesturetap: ((this: Window, ev: Event) => any) | null;
-    onmsinertiastart: ((this: Window, ev: Event) => any) | null;
-    onmspointercancel: ((this: Window, ev: Event) => any) | null;
-    onmspointerdown: ((this: Window, ev: Event) => any) | null;
-    onmspointerenter: ((this: Window, ev: Event) => any) | null;
-    onmspointerleave: ((this: Window, ev: Event) => any) | null;
-    onmspointermove: ((this: Window, ev: Event) => any) | null;
-    onmspointerout: ((this: Window, ev: Event) => any) | null;
-    onmspointerover: ((this: Window, ev: Event) => any) | null;
-    onmspointerup: ((this: Window, ev: Event) => any) | null;
-    onoffline: ((this: Window, ev: Event) => any) | null;
-    ononline: ((this: Window, ev: Event) => any) | null;
-    onorientationchange: ((this: Window, ev: Event) => any) | null;
-    onpagehide: ((this: Window, ev: PageTransitionEvent) => any) | null;
-    onpageshow: ((this: Window, ev: PageTransitionEvent) => any) | null;
-    onpause: ((this: Window, ev: Event) => any) | null;
-    onplay: ((this: Window, ev: Event) => any) | null;
-    onplaying: ((this: Window, ev: Event) => any) | null;
-    onpopstate: ((this: Window, ev: PopStateEvent) => any) | null;
-    onprogress: ((this: Window, ev: ProgressEvent) => any) | null;
-    onratechange: ((this: Window, ev: Event) => any) | null;
-    onreadystatechange: ((this: Window, ev: ProgressEvent) => any) | null;
-    onreset: ((this: Window, ev: Event) => any) | null;
-    onresize: ((this: Window, ev: UIEvent) => any) | null;
-    onscroll: ((this: Window, ev: UIEvent) => any) | null;
-    onseeked: ((this: Window, ev: Event) => any) | null;
-    onseeking: ((this: Window, ev: Event) => any) | null;
-    onselect: ((this: Window, ev: UIEvent) => any) | null;
-    onstalled: ((this: Window, ev: Event) => any) | null;
-    onstorage: ((this: Window, ev: StorageEvent) => any) | null;
-    onsubmit: ((this: Window, ev: Event) => any) | null;
-    onsuspend: ((this: Window, ev: Event) => any) | null;
-    ontimeupdate: ((this: Window, ev: Event) => any) | null;
-    ontouchcancel: (ev: TouchEvent) => any;
-    ontouchend: (ev: TouchEvent) => any;
-    ontouchmove: (ev: TouchEvent) => any;
-    ontouchstart: (ev: TouchEvent) => any;
-    onunload: ((this: Window, ev: Event) => any) | null;
-    onvolumechange: ((this: Window, ev: Event) => any) | null;
-    onvrdisplayactivate: ((this: Window, ev: Event) => any) | null;
-    onvrdisplayblur: ((this: Window, ev: Event) => any) | null;
-    onvrdisplayconnect: ((this: Window, ev: Event) => any) | null;
-    onvrdisplaydeactivate: ((this: Window, ev: Event) => any) | null;
-    onvrdisplaydisconnect: ((this: Window, ev: Event) => any) | null;
-    onvrdisplayfocus: ((this: Window, ev: Event) => any) | null;
-    onvrdisplaypointerrestricted: ((this: Window, ev: Event) => any) | null;
-    onvrdisplaypointerunrestricted: ((this: Window, ev: Event) => any) | null;
-    onvrdisplaypresentchange: ((this: Window, ev: Event) => any) | null;
-    onwaiting: ((this: Window, ev: Event) => any) | null;
-    opener: any;
-    readonly orientation: string | number;
-    readonly outerHeight: number;
-    readonly outerWidth: number;
-    readonly pageXOffset: number;
-    readonly pageYOffset: number;
-    readonly parent: Window;
-    readonly performance: Performance;
-    readonly personalbar: BarProp;
-    readonly screen: Screen;
-    readonly screenLeft: number;
-    readonly screenTop: number;
-    readonly screenX: number;
-    readonly screenY: number;
-    readonly scrollX: number;
-    readonly scrollY: number;
-    readonly scrollbars: BarProp;
-    readonly self: Window;
-    readonly speechSynthesis: SpeechSynthesis;
-    status: string;
-    readonly statusbar: BarProp;
-    readonly styleMedia: StyleMedia;
-    readonly toolbar: BarProp;
-    readonly top: Window;
-    readonly window: Window;
-    alert(message?: any): void;
-    blur(): void;
-    cancelAnimationFrame(handle: number): void;
-    captureEvents(): void;
-    close(): void;
-    confirm(message?: string): boolean;
-    createImageBitmap(image: HTMLImageElement | SVGImageElement | HTMLVideoElement | HTMLCanvasElement | ImageBitmap | ImageData | Blob, options?: ImageBitmapOptions): Promise<ImageBitmap>;
-    createImageBitmap(image: HTMLImageElement | SVGImageElement | HTMLVideoElement | HTMLCanvasElement | ImageBitmap | ImageData | Blob, sx: number, sy: number, sw: number, sh: number, options?: ImageBitmapOptions): Promise<ImageBitmap>;
-    departFocus(navigationReason: NavigationReason, origin: FocusNavigationOrigin): void;
-    focus(): void;
-    getComputedStyle(elt: Element, pseudoElt?: string | null): CSSStyleDeclaration;
-    getMatchedCSSRules(elt: Element, pseudoElt?: string | null): CSSRuleList;
-    getSelection(): Selection;
-    matchMedia(mediaQuery: string): MediaQueryList;
-    moveBy(x?: number, y?: number): void;
-    moveTo(x?: number, y?: number): void;
-    msWriteProfilerMark(profilerMarkName: string): void;
-    open(url?: string, target?: string, features?: string, replace?: boolean): Window | null;
-    postMessage(message: any, targetOrigin: string, transfer?: any[]): void;
-    print(): void;
-    prompt(message?: string, _default?: string): string | null;
-    releaseEvents(): void;
-    requestAnimationFrame(callback: FrameRequestCallback): number;
-    resizeBy(x?: number, y?: number): void;
-    resizeTo(x?: number, y?: number): void;
-    scroll(options?: ScrollToOptions): void;
-    scroll(x?: number, y?: number): void;
-    scrollBy(options?: ScrollToOptions): void;
-    scrollBy(x?: number, y?: number): void;
-    scrollTo(options?: ScrollToOptions): void;
-    scrollTo(x?: number, y?: number): void;
-    stop(): void;
-    webkitCancelAnimationFrame(handle: number): void;
-    webkitConvertPointFromNodeToPage(node: Node, pt: WebKitPoint): WebKitPoint;
-    webkitConvertPointFromPageToNode(node: Node, pt: WebKitPoint): WebKitPoint;
-    webkitRequestAnimationFrame(callback: FrameRequestCallback): number;
-    addEventListener<K extends keyof WindowEventMap>(type: K, listener: (this: Window, ev: WindowEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof WindowEventMap>(type: K, listener: (this: Window, ev: WindowEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var Window: {
-    prototype: Window;
-    new(): Window;
-};
-
-interface WindowBase64 {
-    atob(encodedString: string): string;
-    btoa(rawString: string): string;
-}
-
-interface WindowConsole {
-    readonly console: Console;
-}
-
-interface WindowEventHandlersEventMap {
-    "afterprint": Event;
-    "beforeprint": Event;
-    "beforeunload": BeforeUnloadEvent;
-    "hashchange": HashChangeEvent;
-    "message": MessageEvent;
-    "offline": Event;
-    "online": Event;
-    "pagehide": PageTransitionEvent;
-    "pageshow": PageTransitionEvent;
-    "popstate": PopStateEvent;
-    "storage": StorageEvent;
-    "unload": Event;
-}
-
-interface WindowEventHandlers {
-    onafterprint: ((this: WindowEventHandlers, ev: Event) => any) | null;
-    onbeforeprint: ((this: WindowEventHandlers, ev: Event) => any) | null;
-    onbeforeunload: ((this: WindowEventHandlers, ev: BeforeUnloadEvent) => any) | null;
-    onhashchange: ((this: WindowEventHandlers, ev: HashChangeEvent) => any) | null;
-    onmessage: ((this: WindowEventHandlers, ev: MessageEvent) => any) | null;
-    onoffline: ((this: WindowEventHandlers, ev: Event) => any) | null;
-    ononline: ((this: WindowEventHandlers, ev: Event) => any) | null;
-    onpagehide: ((this: WindowEventHandlers, ev: PageTransitionEvent) => any) | null;
-    onpageshow: ((this: WindowEventHandlers, ev: PageTransitionEvent) => any) | null;
-    onpopstate: ((this: WindowEventHandlers, ev: PopStateEvent) => any) | null;
-    onstorage: ((this: WindowEventHandlers, ev: StorageEvent) => any) | null;
-    onunload: ((this: WindowEventHandlers, ev: Event) => any) | null;
-    addEventListener<K extends keyof WindowEventHandlersEventMap>(type: K, listener: (this: WindowEventHandlers, ev: WindowEventHandlersEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof WindowEventHandlersEventMap>(type: K, listener: (this: WindowEventHandlers, ev: WindowEventHandlersEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-interface WindowLocalStorage {
-    readonly localStorage: Storage;
-}
-
-interface WindowSessionStorage {
-    readonly sessionStorage: Storage;
-}
-
-interface WindowTimers extends WindowTimersExtension {
-    clearInterval(handle?: number): void;
-    clearTimeout(handle?: number): void;
-    setInterval(handler: (...args: any[]) => void, timeout: number): number;
-    setInterval(handler: any, timeout?: any, ...args: any[]): number;
-    setTimeout(handler: (...args: any[]) => void, timeout: number): number;
-    setTimeout(handler: any, timeout?: any, ...args: any[]): number;
-}
-
-interface WindowTimersExtension {
-    clearImmediate(handle: number): void;
-    setImmediate(handler: (...args: any[]) => void): number;
-    setImmediate(handler: any, ...args: any[]): number;
-}
-
-interface WorkerEventMap extends AbstractWorkerEventMap {
-    "message": MessageEvent;
-}
-
-interface Worker extends EventTarget, AbstractWorker {
-    onmessage: ((this: Worker, ev: MessageEvent) => any) | null;
-    /** @deprecated */
-    postMessage(message: any, transfer?: any[]): void;
-    terminate(): void;
-    addEventListener<K extends keyof WorkerEventMap>(type: K, listener: (this: Worker, ev: WorkerEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof WorkerEventMap>(type: K, listener: (this: Worker, ev: WorkerEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var Worker: {
-    prototype: Worker;
-    new(stringUrl: string): Worker;
-};
-
-interface WritableStream {
-    readonly locked: boolean;
-    abort(reason?: any): Promise<void>;
-    getWriter(): WritableStreamDefaultWriter;
-}
-
-declare var WritableStream: {
-    prototype: WritableStream;
-    new(underlyingSink?: UnderlyingSink, strategy?: QueuingStrategy): WritableStream;
-};
-
-interface WritableStreamDefaultController {
-    error(error?: any): void;
-}
-
-declare var WritableStreamDefaultController: {
-    prototype: WritableStreamDefaultController;
-    new(): WritableStreamDefaultController;
-};
-
-interface WritableStreamDefaultWriter {
-    readonly closed: Promise<void>;
-    readonly desiredSize: number;
-    readonly ready: Promise<void>;
-    abort(reason?: any): Promise<void>;
-    close(): Promise<void>;
-    releaseLock(): void;
-    write(chunk?: any): Promise<any>;
-}
-
-declare var WritableStreamDefaultWriter: {
-    prototype: WritableStreamDefaultWriter;
-    new(): WritableStreamDefaultWriter;
-};
-
-interface XMLDocument extends Document {
-    addEventListener<K extends keyof DocumentEventMap>(type: K, listener: (this: XMLDocument, ev: DocumentEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof DocumentEventMap>(type: K, listener: (this: XMLDocument, ev: DocumentEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var XMLDocument: {
-    prototype: XMLDocument;
-    new(): XMLDocument;
-};
-
-interface XMLHttpRequestEventMap extends XMLHttpRequestEventTargetEventMap {
-    "readystatechange": Event;
-}
-
-interface XMLHttpRequest extends EventTarget, XMLHttpRequestEventTarget {
-    msCaching: string;
-    onreadystatechange: ((this: XMLHttpRequest, ev: Event) => any) | null;
-    readonly readyState: number;
-    readonly response: any;
-    readonly responseText: string;
-    responseType: XMLHttpRequestResponseType;
-    readonly responseURL: string;
-    readonly responseXML: Document | null;
-    readonly status: number;
-    readonly statusText: string;
-    timeout: number;
-    readonly upload: XMLHttpRequestUpload;
-    withCredentials: boolean;
-    abort(): void;
-    getAllResponseHeaders(): string;
-    getResponseHeader(header: string): string | null;
-    msCachingEnabled(): boolean;
-    open(method: string, url: string, async?: boolean, user?: string | null, password?: string | null): void;
-    overrideMimeType(mime: string): void;
-    send(data?: any): void;
-    setRequestHeader(header: string, value: string): void;
-    readonly DONE: number;
-    readonly HEADERS_RECEIVED: number;
-    readonly LOADING: number;
-    readonly OPENED: number;
-    readonly UNSENT: number;
-    addEventListener<K extends keyof XMLHttpRequestEventMap>(type: K, listener: (this: XMLHttpRequest, ev: XMLHttpRequestEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof XMLHttpRequestEventMap>(type: K, listener: (this: XMLHttpRequest, ev: XMLHttpRequestEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var XMLHttpRequest: {
-    prototype: XMLHttpRequest;
-    new(): XMLHttpRequest;
-    readonly DONE: number;
-    readonly HEADERS_RECEIVED: number;
-    readonly LOADING: number;
-    readonly OPENED: number;
-    readonly UNSENT: number;
-};
-
-interface XMLHttpRequestEventTargetEventMap {
-    "abort": Event;
-    "error": ErrorEvent;
-    "load": Event;
-    "loadend": ProgressEvent;
-    "loadstart": Event;
-    "progress": ProgressEvent;
-    "timeout": ProgressEvent;
-}
-
-interface XMLHttpRequestEventTarget {
-    onabort: ((this: XMLHttpRequest, ev: Event) => any) | null;
-    onerror: ((this: XMLHttpRequest, ev: ErrorEvent) => any) | null;
-    onload: ((this: XMLHttpRequest, ev: Event) => any) | null;
-    onloadend: ((this: XMLHttpRequest, ev: ProgressEvent) => any) | null;
-    onloadstart: ((this: XMLHttpRequest, ev: Event) => any) | null;
-    onprogress: ((this: XMLHttpRequest, ev: ProgressEvent) => any) | null;
-    ontimeout: ((this: XMLHttpRequest, ev: ProgressEvent) => any) | null;
-    addEventListener<K extends keyof XMLHttpRequestEventTargetEventMap>(type: K, listener: (this: XMLHttpRequestEventTarget, ev: XMLHttpRequestEventTargetEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof XMLHttpRequestEventTargetEventMap>(type: K, listener: (this: XMLHttpRequestEventTarget, ev: XMLHttpRequestEventTargetEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-interface XMLHttpRequestUpload extends EventTarget, XMLHttpRequestEventTarget {
-    addEventListener<K extends keyof XMLHttpRequestEventTargetEventMap>(type: K, listener: (this: XMLHttpRequestUpload, ev: XMLHttpRequestEventTargetEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof XMLHttpRequestEventTargetEventMap>(type: K, listener: (this: XMLHttpRequestUpload, ev: XMLHttpRequestEventTargetEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var XMLHttpRequestUpload: {
-    prototype: XMLHttpRequestUpload;
-    new(): XMLHttpRequestUpload;
-};
-
-interface XMLSerializer {
-    serializeToString(target: Node): string;
-}
-
-declare var XMLSerializer: {
-    prototype: XMLSerializer;
-    new(): XMLSerializer;
-};
-
-interface XPathEvaluator {
-    createExpression(expression: string, resolver: XPathNSResolver): XPathExpression;
-    createNSResolver(nodeResolver?: Node): XPathNSResolver;
-    evaluate(expression: string, contextNode: Node, resolver: XPathNSResolver | null, type: number, result: XPathResult | null): XPathResult;
-}
-
-declare var XPathEvaluator: {
-    prototype: XPathEvaluator;
-    new(): XPathEvaluator;
-};
-
-interface XPathExpression {
-    evaluate(contextNode: Node, type: number, result: XPathResult | null): XPathResult;
-}
-
-declare var XPathExpression: {
-    prototype: XPathExpression;
-    new(): XPathExpression;
-};
-
-interface XPathNSResolver {
-    lookupNamespaceURI(prefix: string): string;
-}
-
-declare var XPathNSResolver: {
-    prototype: XPathNSResolver;
-    new(): XPathNSResolver;
-};
-
-interface XPathResult {
-    readonly booleanValue: boolean;
-    readonly invalidIteratorState: boolean;
-    readonly numberValue: number;
-    readonly resultType: number;
-    readonly singleNodeValue: Node;
-    readonly snapshotLength: number;
-    readonly stringValue: string;
-    iterateNext(): Node;
-    snapshotItem(index: number): Node;
-    readonly ANY_TYPE: number;
-    readonly ANY_UNORDERED_NODE_TYPE: number;
-    readonly BOOLEAN_TYPE: number;
-    readonly FIRST_ORDERED_NODE_TYPE: number;
-    readonly NUMBER_TYPE: number;
-    readonly ORDERED_NODE_ITERATOR_TYPE: number;
-    readonly ORDERED_NODE_SNAPSHOT_TYPE: number;
-    readonly STRING_TYPE: number;
-    readonly UNORDERED_NODE_ITERATOR_TYPE: number;
-    readonly UNORDERED_NODE_SNAPSHOT_TYPE: number;
-}
-
-declare var XPathResult: {
-    prototype: XPathResult;
-    new(): XPathResult;
-    readonly ANY_TYPE: number;
-    readonly ANY_UNORDERED_NODE_TYPE: number;
-    readonly BOOLEAN_TYPE: number;
-    readonly FIRST_ORDERED_NODE_TYPE: number;
-    readonly NUMBER_TYPE: number;
-    readonly ORDERED_NODE_ITERATOR_TYPE: number;
-    readonly ORDERED_NODE_SNAPSHOT_TYPE: number;
-    readonly STRING_TYPE: number;
-    readonly UNORDERED_NODE_ITERATOR_TYPE: number;
-    readonly UNORDERED_NODE_SNAPSHOT_TYPE: number;
-};
-
-interface XSLTProcessor {
-    clearParameters(): void;
-    getParameter(namespaceURI: string, localName: string): any;
-    importStylesheet(style: Node): void;
-    removeParameter(namespaceURI: string, localName: string): void;
-    reset(): void;
-    setParameter(namespaceURI: string, localName: string, value: any): void;
-    transformToDocument(source: Node): Document;
-    transformToFragment(source: Node, document: Document): DocumentFragment;
-}
-
-declare var XSLTProcessor: {
-    prototype: XSLTProcessor;
-    new(): XSLTProcessor;
-};
-
-interface webkitRTCPeerConnection extends RTCPeerConnection {
-    addEventListener<K extends keyof RTCPeerConnectionEventMap>(type: K, listener: (this: webkitRTCPeerConnection, ev: RTCPeerConnectionEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCPeerConnectionEventMap>(type: K, listener: (this: webkitRTCPeerConnection, ev: RTCPeerConnectionEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var webkitRTCPeerConnection: {
-    prototype: webkitRTCPeerConnection;
-    new(configuration: RTCConfiguration): webkitRTCPeerConnection;
-};
-
-declare type EventListenerOrEventListenerObject = EventListener | EventListenerObject;
-
-interface DecodeErrorCallback {
-    (error: DOMException): void;
-}
-
-interface DecodeSuccessCallback {
-    (decodedData: AudioBuffer): void;
-}
-
-interface ErrorEventHandler {
-    (event: Event | string, source?: string, fileno?: number, columnNumber?: number, error?: Error): void;
-}
-
-interface EventHandlerNonNull {
-    (event: Event): any;
-}
-
-interface ForEachCallback {
-    (keyId: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null, status: MediaKeyStatus): void;
-}
-
-interface FrameRequestCallback {
-    (time: number): void;
-}
-
-interface FunctionStringCallback {
-    (data: string): void;
-}
-
-interface IntersectionObserverCallback {
-    (entries: IntersectionObserverEntry[], observer: IntersectionObserver): void;
-}
-
-interface MSLaunchUriCallback {
-    (): void;
-}
-
-interface MediaQueryListListener {
-    (mql: MediaQueryList): void;
-}
-
-interface MutationCallback {
-    (mutations: MutationRecord[], observer: MutationObserver): void;
-}
-
-interface NavigatorUserMediaErrorCallback {
-    (error: MediaStreamError): void;
-}
-
-interface NavigatorUserMediaSuccessCallback {
-    (stream: MediaStream): void;
-}
-
-interface NotificationPermissionCallback {
-    (permission: NotificationPermission): void;
-}
-
-interface PositionCallback {
-    (position: Position): void;
-}
-
-interface PositionErrorCallback {
-    (error: PositionError): void;
-}
-
-interface RTCPeerConnectionErrorCallback {
-    (error: DOMError): void;
-}
-
-interface RTCSessionDescriptionCallback {
-    (sdp: RTCSessionDescription): void;
-}
-
-interface RTCStatsCallback {
-    (report: RTCStatsReport): void;
-}
-
-interface VoidFunction {
-    (): void;
-}
-
-interface WritableStreamChunkCallback {
-    (chunk: any, controller: WritableStreamDefaultController): void;
-}
-
-interface WritableStreamDefaultControllerCallback {
-    (controller: WritableStreamDefaultController): void;
-}
-
-interface WritableStreamErrorCallback {
-    (reason: string): void;
-}
-
-interface HTMLElementTagNameMap {
-    "a": HTMLAnchorElement;
-    "abbr": HTMLElement;
-    "acronym": HTMLElement;
-    "address": HTMLElement;
-    "applet": HTMLAppletElement;
-    "area": HTMLAreaElement;
-    "article": HTMLElement;
-    "aside": HTMLElement;
-    "audio": HTMLAudioElement;
-    "b": HTMLElement;
-    "base": HTMLBaseElement;
-    "basefont": HTMLBaseFontElement;
-    "bdo": HTMLElement;
-    "big": HTMLElement;
-    "blockquote": HTMLQuoteElement;
-    "body": HTMLBodyElement;
-    "br": HTMLBRElement;
-    "button": HTMLButtonElement;
-    "canvas": HTMLCanvasElement;
-    "caption": HTMLTableCaptionElement;
-    "center": HTMLElement;
-    "cite": HTMLElement;
-    "code": HTMLElement;
-    "col": HTMLTableColElement;
-    "colgroup": HTMLTableColElement;
-    "data": HTMLDataElement;
-    "datalist": HTMLDataListElement;
-    "dd": HTMLElement;
-    "del": HTMLModElement;
-    "dfn": HTMLElement;
-    "dir": HTMLDirectoryElement;
-    "div": HTMLDivElement;
-    "dl": HTMLDListElement;
-    "dt": HTMLElement;
-    "em": HTMLElement;
-    "embed": HTMLEmbedElement;
-    "fieldset": HTMLFieldSetElement;
-    "figcaption": HTMLElement;
-    "figure": HTMLElement;
-    "font": HTMLFontElement;
-    "footer": HTMLElement;
-    "form": HTMLFormElement;
-    "frame": HTMLFrameElement;
-    "frameset": HTMLFrameSetElement;
-    "h1": HTMLHeadingElement;
-    "h2": HTMLHeadingElement;
-    "h3": HTMLHeadingElement;
-    "h4": HTMLHeadingElement;
-    "h5": HTMLHeadingElement;
-    "h6": HTMLHeadingElement;
-    "head": HTMLHeadElement;
-    "header": HTMLElement;
-    "hgroup": HTMLElement;
-    "hr": HTMLHRElement;
-    "html": HTMLHtmlElement;
-    "i": HTMLElement;
-    "iframe": HTMLIFrameElement;
-    "img": HTMLImageElement;
-    "input": HTMLInputElement;
-    "ins": HTMLModElement;
-    "isindex": HTMLUnknownElement;
-    "kbd": HTMLElement;
-    "keygen": HTMLElement;
-    "label": HTMLLabelElement;
-    "legend": HTMLLegendElement;
-    "li": HTMLLIElement;
-    "link": HTMLLinkElement;
-    "listing": HTMLPreElement;
-    "map": HTMLMapElement;
-    "mark": HTMLElement;
-    "marquee": HTMLMarqueeElement;
-    "menu": HTMLMenuElement;
-    "meta": HTMLMetaElement;
-    "meter": HTMLMeterElement;
-    "nav": HTMLElement;
-    "nextid": HTMLUnknownElement;
-    "nobr": HTMLElement;
-    "noframes": HTMLElement;
-    "noscript": HTMLElement;
-    "object": HTMLObjectElement;
-    "ol": HTMLOListElement;
-    "optgroup": HTMLOptGroupElement;
-    "option": HTMLOptionElement;
-    "output": HTMLOutputElement;
-    "p": HTMLParagraphElement;
-    "param": HTMLParamElement;
-    "picture": HTMLPictureElement;
-    "plaintext": HTMLElement;
-    "pre": HTMLPreElement;
-    "progress": HTMLProgressElement;
-    "q": HTMLQuoteElement;
-    "rt": HTMLElement;
-    "ruby": HTMLElement;
-    "s": HTMLElement;
-    "samp": HTMLElement;
-    "script": HTMLScriptElement;
-    "section": HTMLElement;
-    "select": HTMLSelectElement;
-    "slot": HTMLSlotElement;
-    "small": HTMLElement;
-    "source": HTMLSourceElement;
-    "span": HTMLSpanElement;
-    "strike": HTMLElement;
-    "strong": HTMLElement;
-    "style": HTMLStyleElement;
-    "sub": HTMLElement;
-    "sup": HTMLElement;
-    "table": HTMLTableElement;
-    "tbody": HTMLTableSectionElement;
-    "td": HTMLTableDataCellElement;
-    "template": HTMLTemplateElement;
-    "textarea": HTMLTextAreaElement;
-    "tfoot": HTMLTableSectionElement;
-    "th": HTMLTableHeaderCellElement;
-    "thead": HTMLTableSectionElement;
-    "time": HTMLTimeElement;
-    "title": HTMLTitleElement;
-    "tr": HTMLTableRowElement;
-    "track": HTMLTrackElement;
-    "tt": HTMLElement;
-    "u": HTMLElement;
-    "ul": HTMLUListElement;
-    "var": HTMLElement;
-    "video": HTMLVideoElement;
-    "wbr": HTMLElement;
-    "xmp": HTMLPreElement;
-}
-
-interface SVGElementTagNameMap {
-    "circle": SVGCircleElement;
-    "clippath": SVGClipPathElement;
-    "defs": SVGDefsElement;
-    "desc": SVGDescElement;
-    "ellipse": SVGEllipseElement;
-    "feblend": SVGFEBlendElement;
-    "fecolormatrix": SVGFEColorMatrixElement;
-    "fecomponenttransfer": SVGFEComponentTransferElement;
-    "fecomposite": SVGFECompositeElement;
-    "feconvolvematrix": SVGFEConvolveMatrixElement;
-    "fediffuselighting": SVGFEDiffuseLightingElement;
-    "fedisplacementmap": SVGFEDisplacementMapElement;
-    "fedistantlight": SVGFEDistantLightElement;
-    "feflood": SVGFEFloodElement;
-    "fefunca": SVGFEFuncAElement;
-    "fefuncb": SVGFEFuncBElement;
-    "fefuncg": SVGFEFuncGElement;
-    "fefuncr": SVGFEFuncRElement;
-    "fegaussianblur": SVGFEGaussianBlurElement;
-    "feimage": SVGFEImageElement;
-    "femerge": SVGFEMergeElement;
-    "femergenode": SVGFEMergeNodeElement;
-    "femorphology": SVGFEMorphologyElement;
-    "feoffset": SVGFEOffsetElement;
-    "fepointlight": SVGFEPointLightElement;
-    "fespecularlighting": SVGFESpecularLightingElement;
-    "fespotlight": SVGFESpotLightElement;
-    "fetile": SVGFETileElement;
-    "feturbulence": SVGFETurbulenceElement;
-    "filter": SVGFilterElement;
-    "foreignobject": SVGForeignObjectElement;
-    "g": SVGGElement;
-    "image": SVGImageElement;
-    "line": SVGLineElement;
-    "lineargradient": SVGLinearGradientElement;
-    "marker": SVGMarkerElement;
-    "mask": SVGMaskElement;
-    "metadata": SVGMetadataElement;
-    "path": SVGPathElement;
-    "pattern": SVGPatternElement;
-    "polygon": SVGPolygonElement;
-    "polyline": SVGPolylineElement;
-    "radialgradient": SVGRadialGradientElement;
-    "rect": SVGRectElement;
-    "stop": SVGStopElement;
-    "svg": SVGSVGElement;
-    "switch": SVGSwitchElement;
-    "symbol": SVGSymbolElement;
-    "text": SVGTextElement;
-    "textpath": SVGTextPathElement;
-    "tspan": SVGTSpanElement;
-    "use": SVGUseElement;
-    "view": SVGViewElement;
-}
-
-/** @deprecated Directly use HTMLElementTagNameMap or SVGElementTagNameMap as appropriate, instead. */
-interface ElementTagNameMap extends HTMLElementTagNameMap, SVGElementTagNameMap { }
-
-declare var Audio: {
-    new(src?: string): HTMLAudioElement;
-};
-declare var Image: {
-    new(width?: number, height?: number): HTMLImageElement;
-};
-declare var Option: {
-    new(text?: string, value?: string, defaultSelected?: boolean, selected?: boolean): HTMLOptionElement;
-};
-declare var Blob: typeof Blob;
-declare var URL: typeof URL;
-declare var URLSearchParams: typeof URLSearchParams;
-declare var applicationCache: ApplicationCache;
-declare var caches: CacheStorage;
-declare var clientInformation: Navigator;
-declare var closed: boolean;
-declare var crypto: Crypto;
-declare var customElements: CustomElementRegistry;
-declare var defaultStatus: string;
-declare var devicePixelRatio: number;
-declare var doNotTrack: string;
-declare var document: Document;
-declare var event: Event | undefined;
-declare var external: External;
-declare var frameElement: Element;
-declare var frames: Window;
-declare var history: History;
-declare var innerHeight: number;
-declare var innerWidth: number;
-declare var isSecureContext: boolean;
-declare var length: number;
-declare var location: Location;
-declare var locationbar: BarProp;
-declare var menubar: BarProp;
-declare var msContentScript: ExtensionScriptApis;
-declare var msCredentials: MSCredentials;
-declare const name: never;
-declare var navigator: Navigator;
-declare var offscreenBuffering: string | boolean;
-declare var onabort: ((this: Window, ev: UIEvent) => any) | null;
-declare var onafterprint: ((this: Window, ev: Event) => any) | null;
-declare var onbeforeprint: ((this: Window, ev: Event) => any) | null;
-declare var onbeforeunload: ((this: Window, ev: BeforeUnloadEvent) => any) | null;
-declare var onblur: ((this: Window, ev: FocusEvent) => any) | null;
-declare var oncanplay: ((this: Window, ev: Event) => any) | null;
-declare var oncanplaythrough: ((this: Window, ev: Event) => any) | null;
-declare var onchange: ((this: Window, ev: Event) => any) | null;
-declare var onclick: ((this: Window, ev: MouseEvent) => any) | null;
-declare var oncompassneedscalibration: ((this: Window, ev: Event) => any) | null;
-declare var oncontextmenu: ((this: Window, ev: PointerEvent) => any) | null;
-declare var ondblclick: ((this: Window, ev: MouseEvent) => any) | null;
-declare var ondevicelight: ((this: Window, ev: DeviceLightEvent) => any) | null;
-declare var ondevicemotion: ((this: Window, ev: DeviceMotionEvent) => any) | null;
-declare var ondeviceorientation: ((this: Window, ev: DeviceOrientationEvent) => any) | null;
-declare var ondrag: ((this: Window, ev: DragEvent) => any) | null;
-declare var ondragend: ((this: Window, ev: DragEvent) => any) | null;
-declare var ondragenter: ((this: Window, ev: DragEvent) => any) | null;
-declare var ondragleave: ((this: Window, ev: DragEvent) => any) | null;
-declare var ondragover: ((this: Window, ev: DragEvent) => any) | null;
-declare var ondragstart: ((this: Window, ev: DragEvent) => any) | null;
-declare var ondrop: ((this: Window, ev: DragEvent) => any) | null;
-declare var ondurationchange: ((this: Window, ev: Event) => any) | null;
-declare var onemptied: ((this: Window, ev: Event) => any) | null;
-declare var onended: ((this: Window, ev: Event) => any) | null;
-declare var onerror: ErrorEventHandler;
-declare var onfocus: ((this: Window, ev: FocusEvent) => any) | null;
-declare var onhashchange: ((this: Window, ev: HashChangeEvent) => any) | null;
-declare var oninput: ((this: Window, ev: Event) => any) | null;
-declare var oninvalid: ((this: Window, ev: Event) => any) | null;
-declare var onkeydown: ((this: Window, ev: KeyboardEvent) => any) | null;
-declare var onkeypress: ((this: Window, ev: KeyboardEvent) => any) | null;
-declare var onkeyup: ((this: Window, ev: KeyboardEvent) => any) | null;
-declare var onload: ((this: Window, ev: Event) => any) | null;
-declare var onloadeddata: ((this: Window, ev: Event) => any) | null;
-declare var onloadedmetadata: ((this: Window, ev: Event) => any) | null;
-declare var onloadstart: ((this: Window, ev: Event) => any) | null;
-declare var onmessage: ((this: Window, ev: MessageEvent) => any) | null;
-declare var onmousedown: ((this: Window, ev: MouseEvent) => any) | null;
-declare var onmouseenter: ((this: Window, ev: MouseEvent) => any) | null;
-declare var onmouseleave: ((this: Window, ev: MouseEvent) => any) | null;
-declare var onmousemove: ((this: Window, ev: MouseEvent) => any) | null;
-declare var onmouseout: ((this: Window, ev: MouseEvent) => any) | null;
-declare var onmouseover: ((this: Window, ev: MouseEvent) => any) | null;
-declare var onmouseup: ((this: Window, ev: MouseEvent) => any) | null;
-declare var onmousewheel: ((this: Window, ev: WheelEvent) => any) | null;
-declare var onmsgesturechange: ((this: Window, ev: Event) => any) | null;
-declare var onmsgesturedoubletap: ((this: Window, ev: Event) => any) | null;
-declare var onmsgestureend: ((this: Window, ev: Event) => any) | null;
-declare var onmsgesturehold: ((this: Window, ev: Event) => any) | null;
-declare var onmsgesturestart: ((this: Window, ev: Event) => any) | null;
-declare var onmsgesturetap: ((this: Window, ev: Event) => any) | null;
-declare var onmsinertiastart: ((this: Window, ev: Event) => any) | null;
-declare var onmspointercancel: ((this: Window, ev: Event) => any) | null;
-declare var onmspointerdown: ((this: Window, ev: Event) => any) | null;
-declare var onmspointerenter: ((this: Window, ev: Event) => any) | null;
-declare var onmspointerleave: ((this: Window, ev: Event) => any) | null;
-declare var onmspointermove: ((this: Window, ev: Event) => any) | null;
-declare var onmspointerout: ((this: Window, ev: Event) => any) | null;
-declare var onmspointerover: ((this: Window, ev: Event) => any) | null;
-declare var onmspointerup: ((this: Window, ev: Event) => any) | null;
-declare var onoffline: ((this: Window, ev: Event) => any) | null;
-declare var ononline: ((this: Window, ev: Event) => any) | null;
-declare var onorientationchange: ((this: Window, ev: Event) => any) | null;
-declare var onpagehide: ((this: Window, ev: PageTransitionEvent) => any) | null;
-declare var onpageshow: ((this: Window, ev: PageTransitionEvent) => any) | null;
-declare var onpause: ((this: Window, ev: Event) => any) | null;
-declare var onplay: ((this: Window, ev: Event) => any) | null;
-declare var onplaying: ((this: Window, ev: Event) => any) | null;
-declare var onpopstate: ((this: Window, ev: PopStateEvent) => any) | null;
-declare var onprogress: ((this: Window, ev: ProgressEvent) => any) | null;
-declare var onratechange: ((this: Window, ev: Event) => any) | null;
-declare var onreadystatechange: ((this: Window, ev: ProgressEvent) => any) | null;
-declare var onreset: ((this: Window, ev: Event) => any) | null;
-declare var onresize: ((this: Window, ev: UIEvent) => any) | null;
-declare var onscroll: ((this: Window, ev: UIEvent) => any) | null;
-declare var onseeked: ((this: Window, ev: Event) => any) | null;
-declare var onseeking: ((this: Window, ev: Event) => any) | null;
-declare var onselect: ((this: Window, ev: UIEvent) => any) | null;
-declare var onstalled: ((this: Window, ev: Event) => any) | null;
-declare var onstorage: ((this: Window, ev: StorageEvent) => any) | null;
-declare var onsubmit: ((this: Window, ev: Event) => any) | null;
-declare var onsuspend: ((this: Window, ev: Event) => any) | null;
-declare var ontimeupdate: ((this: Window, ev: Event) => any) | null;
-declare var ontouchcancel: (ev: TouchEvent) => any;
-declare var ontouchend: (ev: TouchEvent) => any;
-declare var ontouchmove: (ev: TouchEvent) => any;
-declare var ontouchstart: (ev: TouchEvent) => any;
-declare var onunload: ((this: Window, ev: Event) => any) | null;
-declare var onvolumechange: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplayactivate: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplayblur: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplayconnect: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplaydeactivate: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplaydisconnect: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplayfocus: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplaypointerrestricted: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplaypointerunrestricted: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplaypresentchange: ((this: Window, ev: Event) => any) | null;
-declare var onwaiting: ((this: Window, ev: Event) => any) | null;
-declare var opener: any;
-declare var orientation: string | number;
-declare var outerHeight: number;
-declare var outerWidth: number;
-declare var pageXOffset: number;
-declare var pageYOffset: number;
-declare var parent: Window;
-declare var performance: Performance;
-declare var personalbar: BarProp;
-declare var screen: Screen;
-declare var screenLeft: number;
-declare var screenTop: number;
-declare var screenX: number;
-declare var screenY: number;
-declare var scrollX: number;
-declare var scrollY: number;
-declare var scrollbars: BarProp;
-declare var self: Window;
-declare var speechSynthesis: SpeechSynthesis;
-declare var status: string;
-declare var statusbar: BarProp;
-declare var styleMedia: StyleMedia;
-declare var toolbar: BarProp;
-declare var top: Window;
-declare var window: Window;
-declare function alert(message?: any): void;
-declare function blur(): void;
-declare function cancelAnimationFrame(handle: number): void;
-declare function captureEvents(): void;
-declare function close(): void;
-declare function confirm(message?: string): boolean;
-declare function createImageBitmap(image: HTMLImageElement | SVGImageElement | HTMLVideoElement | HTMLCanvasElement | ImageBitmap | ImageData | Blob, options?: ImageBitmapOptions): Promise<ImageBitmap>;
-declare function createImageBitmap(image: HTMLImageElement | SVGImageElement | HTMLVideoElement | HTMLCanvasElement | ImageBitmap | ImageData | Blob, sx: number, sy: number, sw: number, sh: number, options?: ImageBitmapOptions): Promise<ImageBitmap>;
-declare function departFocus(navigationReason: NavigationReason, origin: FocusNavigationOrigin): void;
-declare function focus(): void;
-declare function getComputedStyle(elt: Element, pseudoElt?: string | null): CSSStyleDeclaration;
-declare function getMatchedCSSRules(elt: Element, pseudoElt?: string | null): CSSRuleList;
-declare function getSelection(): Selection;
-declare function matchMedia(mediaQuery: string): MediaQueryList;
-declare function moveBy(x?: number, y?: number): void;
-declare function moveTo(x?: number, y?: number): void;
-declare function msWriteProfilerMark(profilerMarkName: string): void;
-declare function open(url?: string, target?: string, features?: string, replace?: boolean): Window | null;
-declare function postMessage(message: any, targetOrigin: string, transfer?: any[]): void;
-declare function print(): void;
-declare function prompt(message?: string, _default?: string): string | null;
-declare function releaseEvents(): void;
-declare function requestAnimationFrame(callback: FrameRequestCallback): number;
-declare function resizeBy(x?: number, y?: number): void;
-declare function resizeTo(x?: number, y?: number): void;
-declare function scroll(options?: ScrollToOptions): void;
-declare function scroll(x?: number, y?: number): void;
-declare function scrollBy(options?: ScrollToOptions): void;
-declare function scrollBy(x?: number, y?: number): void;
-declare function scrollTo(options?: ScrollToOptions): void;
-declare function scrollTo(x?: number, y?: number): void;
-declare function stop(): void;
-declare function webkitCancelAnimationFrame(handle: number): void;
-declare function webkitConvertPointFromNodeToPage(node: Node, pt: WebKitPoint): WebKitPoint;
-declare function webkitConvertPointFromPageToNode(node: Node, pt: WebKitPoint): WebKitPoint;
-declare function webkitRequestAnimationFrame(callback: FrameRequestCallback): number;
-declare function toString(): string;
-declare function dispatchEvent(evt: Event): boolean;
-declare function clearInterval(handle?: number): void;
-declare function clearTimeout(handle?: number): void;
-declare function setInterval(handler: (...args: any[]) => void, timeout: number): number;
-declare function setInterval(handler: any, timeout?: any, ...args: any[]): number;
-declare function setTimeout(handler: (...args: any[]) => void, timeout: number): number;
-declare function setTimeout(handler: any, timeout?: any, ...args: any[]): number;
-declare function clearImmediate(handle: number): void;
-declare function setImmediate(handler: (...args: any[]) => void): number;
-declare function setImmediate(handler: any, ...args: any[]): number;
-declare var sessionStorage: Storage;
-declare var localStorage: Storage;
-declare var console: Console;
-declare var onpointercancel: ((this: Window, ev: PointerEvent) => any) | null;
-declare var onpointerdown: ((this: Window, ev: PointerEvent) => any) | null;
-declare var onpointerenter: ((this: Window, ev: PointerEvent) => any) | null;
-declare var onpointerleave: ((this: Window, ev: PointerEvent) => any) | null;
-declare var onpointermove: ((this: Window, ev: PointerEvent) => any) | null;
-declare var onpointerout: ((this: Window, ev: PointerEvent) => any) | null;
-declare var onpointerover: ((this: Window, ev: PointerEvent) => any) | null;
-declare var onpointerup: ((this: Window, ev: PointerEvent) => any) | null;
-declare var onwheel: ((this: Window, ev: WheelEvent) => any) | null;
-declare var indexedDB: IDBFactory;
-declare function atob(encodedString: string): string;
-declare function btoa(rawString: string): string;
-declare function fetch(input?: Request | string, init?: RequestInit): Promise<Response>;
-declare function addEventListener<K extends keyof WindowEventMap>(type: K, listener: (this: Window, ev: WindowEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-declare function addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-declare function removeEventListener<K extends keyof WindowEventMap>(type: K, listener: (this: Window, ev: WindowEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-declare function removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-type ScrollBehavior = "auto" | "instant" | "smooth";
-type ScrollLogicalPosition = "start" | "center" | "end" | "nearest";
-type MouseWheelEvent = WheelEvent;
-type ScrollRestoration = "auto" | "manual";
-type FormDataEntryValue = string | File;
-type InsertPosition = "beforebegin" | "afterbegin" | "beforeend" | "afterend";
-type HeadersInit = Headers | string[][] | { [key: string]: string };
-type OrientationLockType = "any" | "natural" | "portrait" | "landscape" | "portrait-primary" | "portrait-secondary" | "landscape-primary"| "landscape-secondary";
-type IDBValidKey = number | string | Date | IDBArrayKey;
-type AlgorithmIdentifier = string | Algorithm;
-type MutationRecordType = "attributes" | "characterData" | "childList";
-type AAGUID = string;
-type BodyInit = any;
-type ByteString = string;
-type ConstrainBoolean = boolean | ConstrainBooleanParameters;
-type ConstrainDOMString = string | string[] | ConstrainDOMStringParameters;
-type ConstrainDouble = number | ConstrainDoubleRange;
-type ConstrainLong = number | ConstrainLongRange;
-type CryptoOperationData = ArrayBufferView;
-type GLbitfield = number;
-type GLboolean = boolean;
-type GLbyte = number;
-type GLclampf = number;
-type GLenum = number;
-type GLfloat = number;
-type GLint = number;
-type GLintptr = number;
-type GLshort = number;
-type GLsizei = number;
-type GLsizeiptr = number;
-type GLubyte = number;
-type GLuint = number;
-type GLushort = number;
-type IDBKeyPath = string;
-type MSInboundPayload = MSVideoRecvPayload | MSAudioRecvPayload;
-type MSLocalClientEvent = MSLocalClientEventBase | MSAudioLocalClientEvent;
-type MSOutboundPayload = MSVideoSendPayload | MSAudioSendPayload;
-type RTCIceGatherCandidate = RTCIceCandidateDictionary | RTCIceCandidateComplete;
-type RTCTransport = RTCDtlsTransport | RTCSrtpSdesTransport;
-type RequestInfo = Request | string;
-type USVString = string;
-type payloadtype = number;
-type BufferSource = ArrayBuffer | ArrayBufferView;
-type ClientTypes = "window" | "worker" | "sharedworker" | "all";
-type AppendMode = "segments" | "sequence";
-type AudioContextLatencyCategory = "balanced" | "interactive" | "playback";
-type AudioContextState = "suspended" | "running" | "closed";
-type BinaryType = "blob" | "arraybuffer";
-type BiquadFilterType = "lowpass" | "highpass" | "bandpass" | "lowshelf" | "highshelf" | "peaking" | "notch" | "allpass";
-type CanPlayTypeResult = "" | "maybe" | "probably";
-type CanvasFillRule = "nonzero" | "evenodd";
-type ChannelCountMode = "max" | "clamped-max" | "explicit";
-type ChannelInterpretation = "speakers" | "discrete";
-type DisplayCaptureSurfaceType = "monitor" | "window" | "application" | "browser";
-type DistanceModelType = "linear" | "inverse" | "exponential";
-type DocumentReadyState = "loading" | "interactive" | "complete";
-type EndOfStreamError = "network" | "decode";
-type ExpandGranularity = "character" | "word" | "sentence" | "textedit";
-type GamepadHand = "" | "left" | "right";
-type GamepadHapticActuatorType = "vibration";
-type GamepadInputEmulationType = "mouse" | "keyboard" | "gamepad";
-type GamepadMappingType = "" | "standard";
-type IDBCursorDirection = "next" | "nextunique" | "prev" | "prevunique";
-type IDBRequestReadyState = "pending" | "done";
-type IDBTransactionMode = "readonly" | "readwrite" | "versionchange";
-type KeyFormat = "raw" | "spki" | "pkcs8" | "jwk";
-type KeyType = "public" | "private" | "secret";
-type KeyUsage = "encrypt" | "decrypt" | "sign" | "verify" | "deriveKey" | "deriveBits" | "wrapKey" | "unwrapKey";
-type ListeningState = "inactive" | "active" | "disambiguation";
-type MSCredentialType = "FIDO_2_0";
-type MSIceAddrType = "os" | "stun" | "turn" | "peer-derived";
-type MSIceType = "failed" | "direct" | "relay";
-type MSStatsType = "description" | "localclientevent" | "inbound-network" | "outbound-network" | "inbound-payload" | "outbound-payload" | "transportdiagnostics";
-type MSTransportType = "Embedded" | "USB" | "NFC" | "BT";
-type MSWebViewPermissionState = "unknown" | "defer" | "allow" | "deny";
-type MSWebViewPermissionType = "geolocation" | "unlimitedIndexedDBQuota" | "media" | "pointerlock" | "webnotifications";
-type MediaDeviceKind = "audioinput" | "audiooutput" | "videoinput";
-type MediaKeyMessageType = "license-request" | "license-renewal" | "license-release" | "individualization-request";
-type MediaKeySessionType = "temporary" | "persistent-license" | "persistent-release-message";
-type MediaKeyStatus = "usable" | "expired" | "output-downscaled" | "output-not-allowed" | "status-pending" | "internal-error";
-type MediaKeysRequirement = "required" | "optional" | "not-allowed";
-type MediaStreamTrackState = "live" | "ended";
-type NavigationReason = "up" | "down" | "left" | "right";
-type NavigationType = "navigate" | "reload" | "back_forward" | "prerender";
-type NotificationDirection = "auto" | "ltr" | "rtl";
-type NotificationPermission = "default" | "denied" | "granted";
-type OscillatorType = "sine" | "square" | "sawtooth" | "triangle" | "custom";
-type OverSampleType = "none" | "2x" | "4x";
-type PanningModelType = "equalpower" | "HRTF";
-type PaymentComplete = "success" | "fail" | "unknown";
-type PaymentShippingType = "shipping" | "delivery" | "pickup";
-type PushEncryptionKeyName = "p256dh" | "auth";
-type PushPermissionState = "granted" | "denied" | "prompt";
-type RTCBundlePolicy = "balanced" | "max-compat" | "max-bundle";
-type RTCDegradationPreference = "maintain-framerate" | "maintain-resolution" | "balanced";
-type RTCDtlsRole = "auto" | "client" | "server";
-type RTCDtlsTransportState = "new" | "connecting" | "connected" | "closed";
-type RTCIceCandidateType = "host" | "srflx" | "prflx" | "relay";
-type RTCIceComponent = "RTP" | "RTCP";
-type RTCIceConnectionState = "new" | "checking" | "connected" | "completed" | "failed" | "disconnected" | "closed";
-type RTCIceGatherPolicy = "all" | "nohost" | "relay";
-type RTCIceGathererState = "new" | "gathering" | "complete";
-type RTCIceGatheringState = "new" | "gathering" | "complete";
-type RTCIceProtocol = "udp" | "tcp";
-type RTCIceRole = "controlling" | "controlled";
-type RTCIceTcpCandidateType = "active" | "passive" | "so";
-type RTCIceTransportPolicy = "none" | "relay" | "all";
-type RTCIceTransportState = "new" | "checking" | "connected" | "completed" | "disconnected" | "closed";
-type RTCSdpType = "offer" | "pranswer" | "answer";
-type RTCSignalingState = "stable" | "have-local-offer" | "have-remote-offer" | "have-local-pranswer" | "have-remote-pranswer" | "closed";
-type RTCStatsIceCandidatePairState = "frozen" | "waiting" | "inprogress" | "failed" | "succeeded" | "cancelled";
-type RTCStatsIceCandidateType = "host" | "serverreflexive" | "peerreflexive" | "relayed";
-type RTCStatsType = "inboundrtp" | "outboundrtp" | "session" | "datachannel" | "track" | "transport" | "candidatepair" | "localcandidate" | "remotecandidate";
-type ReadyState = "closed" | "open" | "ended";
-type ReferrerPolicy = "" | "no-referrer" | "no-referrer-when-downgrade" | "origin-only" | "origin-when-cross-origin" | "unsafe-url";
-type RequestCache = "default" | "no-store" | "reload" | "no-cache" | "force-cache";
-type RequestCredentials = "omit" | "same-origin" | "include";
-type RequestDestination = "" | "document" | "sharedworker" | "subresource" | "unknown" | "worker";
-type RequestMode = "navigate" | "same-origin" | "no-cors" | "cors";
-type RequestRedirect = "follow" | "error" | "manual";
-type RequestType = "" | "audio" | "font" | "image" | "script" | "style" | "track" | "video";
-type ResponseType = "basic" | "cors" | "default" | "error" | "opaque" | "opaqueredirect";
-type ScopedCredentialType = "ScopedCred";
-type ServiceWorkerState = "installing" | "installed" | "activating" | "activated" | "redundant";
-type TextTrackKind = "subtitles" | "captions" | "descriptions" | "chapters" | "metadata";
-type TextTrackMode = "disabled" | "hidden" | "showing";
-type Transport = "usb" | "nfc" | "ble";
-type VRDisplayEventReason = "mounted" | "navigation" | "requested" | "unmounted";
-type VREye = "left" | "right";
-type VideoFacingModeEnum = "user" | "environment" | "left" | "right";
-type VisibilityState = "hidden" | "visible" | "prerender" | "unloaded";
-type XMLHttpRequestResponseType = "" | "arraybuffer" | "blob" | "document" | "json" | "text";
-
-
-/////////////////////////////
-/// WorkerGlobalScope APIs
-/////////////////////////////
-// These are only available in a Web Worker
-declare function importScripts(...urls: string[]): void;
-
-
-
-
-/////////////////////////////
-/// Windows Script Host APIS
-/////////////////////////////
-
-
-interface ActiveXObject {
-    new (s: string): any;
-}
-declare var ActiveXObject: ActiveXObject;
-
-interface ITextWriter {
-    Write(s: string): void;
-    WriteLine(s: string): void;
-    Close(): void;
-}
-
-interface TextStreamBase {
-    /**
-     * The column number of the current character position in an input stream.
-     */
-    Column: number;
-
-    /**
-     * The current line number in an input stream.
-     */
-    Line: number;
-
-    /**
-     * Closes a text stream.
-     * It is not necessary to close standard streams; they close automatically when the process ends. If
-     * you close a standard stream, be aware that any other pointers to that standard stream become invalid.
-     */
-    Close(): void;
-}
-
-interface TextStreamWriter extends TextStreamBase {
-    /**
-     * Sends a string to an output stream.
-     */
-    Write(s: string): void;
-
-    /**
-     * Sends a specified number of blank lines (newline characters) to an output stream.
-     */
-    WriteBlankLines(intLines: number): void;
-
-    /**
-     * Sends a string followed by a newline character to an output stream.
-     */
-    WriteLine(s: string): void;
-}
-
-interface TextStreamReader extends TextStreamBase {
-    /**
-     * Returns a specified number of characters from an input stream, starting at the current pointer position.
-     * Does not return until the ENTER key is pressed.
-     * Can only be used on a stream in reading mode; causes an error in writing or appending mode.
-     */
-    Read(characters: number): string;
-
-    /**
-     * Returns all characters from an input stream.
-     * Can only be used on a stream in reading mode; causes an error in writing or appending mode.
-     */
-    ReadAll(): string;
-
-    /**
-     * Returns an entire line from an input stream.
-     * Although this method extracts the newline character, it does not add it to the returned string.
-     * Can only be used on a stream in reading mode; causes an error in writing or appending mode.
-     */
-    ReadLine(): string;
-
-    /**
-     * Skips a specified number of characters when reading from an input text stream.
-     * Can only be used on a stream in reading mode; causes an error in writing or appending mode.
-     * @param characters Positive number of characters to skip forward. (Backward skipping is not supported.)
-     */
-    Skip(characters: number): void;
-
-    /**
-     * Skips the next line when reading from an input text stream.
-     * Can only be used on a stream in reading mode, not writing or appending mode.
-     */
-    SkipLine(): void;
-
-    /**
-     * Indicates whether the stream pointer position is at the end of a line.
-     */
-    AtEndOfLine: boolean;
-
-    /**
-     * Indicates whether the stream pointer position is at the end of a stream.
-     */
-    AtEndOfStream: boolean;
-}
-
-declare var WScript: {
-    /**
-     * Outputs text to either a message box (under WScript.exe) or the command console window followed by
-     * a newline (under CScript.exe).
-     */
-    Echo(s: any): void;
-
-    /**
-     * Exposes the write-only error output stream for the current script.
-     * Can be accessed only while using CScript.exe.
-     */
-    StdErr: TextStreamWriter;
-
-    /**
-     * Exposes the write-only output stream for the current script.
-     * Can be accessed only while using CScript.exe.
-     */
-    StdOut: TextStreamWriter;
-    Arguments: { length: number; Item(n: number): string; };
-
-    /**
-     *  The full path of the currently running script.
-     */
-    ScriptFullName: string;
-
-    /**
-     * Forces the script to stop immediately, with an optional exit code.
-     */
-    Quit(exitCode?: number): number;
-
-    /**
-     * The Windows Script Host build version number.
-     */
-    BuildVersion: number;
-
-    /**
-     * Fully qualified path of the host executable.
-     */
-    FullName: string;
-
-    /**
-     * Gets/sets the script mode - interactive(true) or batch(false).
-     */
-    Interactive: boolean;
-
-    /**
-     * The name of the host executable (WScript.exe or CScript.exe).
-     */
-    Name: string;
-
-    /**
-     * Path of the directory containing the host executable.
-     */
-    Path: string;
-
-    /**
-     * The filename of the currently running script.
-     */
-    ScriptName: string;
-
-    /**
-     * Exposes the read-only input stream for the current script.
-     * Can be accessed only while using CScript.exe.
-     */
-    StdIn: TextStreamReader;
-
-    /**
-     * Windows Script Host version
-     */
-    Version: string;
-
-    /**
-     * Connects a COM object's event sources to functions named with a given prefix, in the form prefix_event.
-     */
-    ConnectObject(objEventSource: any, strPrefix: string): void;
-
-    /**
-     * Creates a COM object.
-     * @param strProgiID
-     * @param strPrefix Function names in the form prefix_event will be bound to this object's COM events.
-     */
-    CreateObject(strProgID: string, strPrefix?: string): any;
-
-    /**
-     * Disconnects a COM object from its event sources.
-     */
-    DisconnectObject(obj: any): void;
-
-    /**
-     * Retrieves an existing object with the specified ProgID from memory, or creates a new one from a file.
-     * @param strPathname Fully qualified path to the file containing the object persisted to disk.
-     *                       For objects in memory, pass a zero-length string.
-     * @param strProgID
-     * @param strPrefix Function names in the form prefix_event will be bound to this object's COM events.
-     */
-    GetObject(strPathname: string, strProgID?: string, strPrefix?: string): any;
-
-    /**
-     * Suspends script execution for a specified length of time, then continues execution.
-     * @param intTime Interval (in milliseconds) to suspend script execution.
-     */
-    Sleep(intTime: number): void;
-};
-
-/**
- * WSH is an alias for WScript under Windows Script Host
- */
-declare var WSH: typeof WScript;
-
-/**
- * Represents an Automation SAFEARRAY
- */
-declare class SafeArray<T = any> {
-    private constructor();
-    private SafeArray_typekey: SafeArray<T>;
-}
-
-/**
- * Allows enumerating over a COM collection, which may not have indexed item access.
- */
-interface Enumerator<T = any> {
-    /**
-     * Returns true if the current item is the last one in the collection, or the collection is empty,
-     * or the current item is undefined.
-     */
-    atEnd(): boolean;
-
-    /**
-     * Returns the current item in the collection
-     */
-    item(): T;
-
-    /**
-     * Resets the current item in the collection to the first item. If there are no items in the collection,
-     * the current item is set to undefined.
-     */
-    moveFirst(): void;
-
-    /**
-     * Moves the current item to the next item in the collection. If the enumerator is at the end of
-     * the collection or the collection is empty, the current item is set to undefined.
-     */
-    moveNext(): void;
-}
-
-interface EnumeratorConstructor {
-    new <T = any>(safearray: SafeArray<T>): Enumerator<T>;
-    new <T = any>(collection: { Item(index: any): T }): Enumerator<T>;
-    new <T = any>(collection: any): Enumerator<T>;
-}
-
-declare var Enumerator: EnumeratorConstructor;
-
-/**
- * Enables reading from a COM safe array, which might have an alternate lower bound, or multiple dimensions.
- */
-interface VBArray<T = any> {
-    /**
-     * Returns the number of dimensions (1-based).
-     */
-    dimensions(): number;
-
-    /**
-     * Takes an index for each dimension in the array, and returns the item at the corresponding location.
-     */
-    getItem(dimension1Index: number, ...dimensionNIndexes: number[]): T;
-
-    /**
-     * Returns the smallest available index for a given dimension.
-     * @param dimension 1-based dimension (defaults to 1)
-     */
-    lbound(dimension?: number): number;
-
-    /**
-     * Returns the largest available index for a given dimension.
-     * @param dimension 1-based dimension (defaults to 1)
-     */
-    ubound(dimension?: number): number;
-
-    /**
-     * Returns a Javascript array with all the elements in the VBArray. If there are multiple dimensions,
-     * each successive dimension is appended to the end of the array.
-     * Example: [[1,2,3],[4,5,6]] becomes [1,2,3,4,5,6]
-     */
-    toArray(): T[];
-}
-
-interface VBArrayConstructor {
-    new <T = any>(safeArray: SafeArray<T>): VBArray<T>;
-}
-
-declare var VBArray: VBArrayConstructor;
-
-/**
- * Automation date (VT_DATE)
- */
-declare class VarDate {
-    private constructor();
-    private VarDate_typekey: VarDate;
-}
-
-interface DateConstructor {
-    new (vd: VarDate): Date;
-}
-
-interface Date {
-    getVarDate: () => VarDate;
-}
+/// <reference lib="es5" />
+/// <reference lib="dom" />
+/// <reference lib="webworker.importscripts" />
+/// <reference lib="scripthost" />
diff --git a/lib/lib.dom.d.ts b/lib/lib.dom.d.ts
index fe0829e2a2a..920c0ad2dae 100644
--- a/lib/lib.dom.d.ts
+++ b/lib/lib.dom.d.ts
@@ -36,11 +36,11 @@ interface AddEventListenerOptions extends EventListenerOptions {
 }
 
 interface AesCbcParams extends Algorithm {
-    iv: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
+    iv: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer;
 }
 
 interface AesCtrParams extends Algorithm {
-    counter: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
+    counter: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer;
     length: number;
 }
 
@@ -49,8 +49,8 @@ interface AesDerivedKeyParams extends Algorithm {
 }
 
 interface AesGcmParams extends Algorithm {
-    additionalData?: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-    iv: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
+    additionalData?: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer;
+    iv: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer;
     tagLength?: number;
 }
 
@@ -76,6 +76,12 @@ interface AnalyserOptions extends AudioNodeOptions {
 interface AnimationEventInit extends EventInit {
     animationName?: string;
     elapsedTime?: number;
+    pseudoElement?: string;
+}
+
+interface AnimationPlaybackEventInit extends EventInit {
+    currentTime?: number | null;
+    timelineTime?: number | null;
 }
 
 interface AssertionOptions {
@@ -117,10 +123,11 @@ interface AudioNodeOptions {
 }
 
 interface AudioParamDescriptor {
+    automationRate?: AutomationRate;
     defaultValue?: number;
     maxValue?: number;
     minValue?: number;
-    name?: string;
+    name: string;
 }
 
 interface AudioProcessingEventInit extends EventInit {
@@ -134,6 +141,14 @@ interface AudioTimestamp {
     performanceTime?: number;
 }
 
+interface AudioWorkletNodeOptions extends AudioNodeOptions {
+    numberOfInputs?: number;
+    numberOfOutputs?: number;
+    outputChannelCount?: number[];
+    parameterData?: Record<string, number>;
+    processorOptions?: any;
+}
+
 interface BiquadFilterOptions extends AudioNodeOptions {
     Q?: number;
     detune?: number;
@@ -142,6 +157,10 @@ interface BiquadFilterOptions extends AudioNodeOptions {
     type?: BiquadFilterType;
 }
 
+interface BlobPropertyBag {
+    type?: string;
+}
+
 interface ByteLengthChunk {
     byteLength?: number;
 }
@@ -171,7 +190,6 @@ interface ClientData {
 }
 
 interface ClientQueryOptions {
-    includeReserved?: boolean;
     includeUncontrolled?: boolean;
     type?: ClientTypes;
 }
@@ -186,6 +204,21 @@ interface CompositionEventInit extends UIEventInit {
     data?: string;
 }
 
+interface ComputedEffectTiming extends EffectTiming {
+    activeDuration?: number;
+    currentIteration?: number | null;
+    endTime?: number;
+    localTime?: number | null;
+    progress?: number | null;
+}
+
+interface ComputedKeyframe extends Record<keyof CSSStyleDeclaration, string> {
+    composite?: CompositeOperation | null;
+    computedOffset?: number;
+    easing?: string;
+    offset?: number | null;
+}
+
 interface ConfirmSiteSpecificExceptionsInformation extends ExceptionInformation {
     arrayOfDomainStrings?: string[];
 }
@@ -228,6 +261,49 @@ interface CustomEventInit<T = any> extends EventInit {
     detail?: T;
 }
 
+interface DOMMatrix2DInit {
+    a?: number;
+    b?: number;
+    c?: number;
+    d?: number;
+    e?: number;
+    f?: number;
+    m11?: number;
+    m12?: number;
+    m21?: number;
+    m22?: number;
+    m41?: number;
+    m42?: number;
+}
+
+interface DOMMatrixInit extends DOMMatrix2DInit {
+    is2D?: boolean;
+    m13?: number;
+    m14?: number;
+    m23?: number;
+    m24?: number;
+    m31?: number;
+    m32?: number;
+    m33?: number;
+    m34?: number;
+    m43?: number;
+    m44?: number;
+}
+
+interface DOMPointInit {
+    w?: number;
+    x?: number;
+    y?: number;
+    z?: number;
+}
+
+interface DOMQuadInit {
+    p1?: DOMPointInit;
+    p2?: DOMPointInit;
+    p3?: DOMPointInit;
+    p4?: DOMPointInit;
+}
+
 interface DOMRectInit {
     height?: number;
     width?: number;
@@ -270,6 +346,10 @@ interface DeviceRotationRateDict {
     gamma?: number | null;
 }
 
+interface DocumentTimelineOptions {
+    originTime?: number;
+}
+
 interface DoubleRange {
     max?: number;
     min?: number;
@@ -303,6 +383,17 @@ interface EcdsaParams extends Algorithm {
     hash: string | Algorithm;
 }
 
+interface EffectTiming {
+    delay?: number;
+    direction?: PlaybackDirection;
+    duration?: number | string;
+    easing?: string;
+    endDelay?: number;
+    fill?: FillMode;
+    iterationStart?: number;
+    iterations?: number;
+}
+
 interface ErrorEventInit extends EventInit {
     colno?: number;
     error?: any;
@@ -314,7 +405,7 @@ interface ErrorEventInit extends EventInit {
 interface EventInit {
     bubbles?: boolean;
     cancelable?: boolean;
-    scoped?: boolean;
+    composed?: boolean;
 }
 
 interface EventListenerOptions {
@@ -350,17 +441,22 @@ interface ExtendableMessageEventInit extends ExtendableEventInit {
     data?: any;
     lastEventId?: string;
     origin?: string;
-    ports?: MessagePort[] | null;
-    source?: object | ServiceWorker | MessagePort | null;
+    ports?: MessagePort[];
+    source?: object | ServiceWorker | MessagePort;
 }
 
 interface FetchEventInit extends ExtendableEventInit {
     clientId?: string;
+    preloadResponse: Promise<any>;
     request: Request;
-    reservedClientId?: string;
+    resultingClientId?: string;
     targetClientId?: string;
 }
 
+interface FilePropertyBag extends BlobPropertyBag {
+    lastModified?: number;
+}
+
 interface FocusEventInit extends UIEventInit {
     relatedTarget?: EventTarget | null;
 }
@@ -399,8 +495,8 @@ interface HashChangeEventInit extends EventInit {
 
 interface HkdfParams extends Algorithm {
     hash: string | Algorithm;
-    info: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-    salt: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
+    info: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer;
+    salt: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer;
 }
 
 interface HmacImportParams extends Algorithm {
@@ -428,6 +524,11 @@ interface IDBObjectStoreParameters {
     keyPath?: string | string[];
 }
 
+interface IDBVersionChangeEventInit extends EventInit {
+    newVersion?: number | null;
+    oldVersion?: number;
+}
+
 interface IIRFilterOptions extends AudioNodeOptions {
     feedback: number[];
     feedforward: number[];
@@ -480,6 +581,21 @@ interface KeyboardEventInit extends EventModifierInit {
     repeat?: boolean;
 }
 
+interface Keyframe extends Record<keyof CSSStyleDeclaration, string> {
+    composite?: CompositeOperation | null;
+    easing?: string;
+    offset?: number | null;
+}
+
+interface KeyframeAnimationOptions extends KeyframeEffectOptions {
+    id?: string;
+}
+
+interface KeyframeEffectOptions extends EffectTiming {
+    composite?: CompositeOperation;
+    iterationComposite?: IterationCompositeOperation;
+}
+
 interface LongRange {
     max?: number;
     min?: number;
@@ -814,8 +930,13 @@ interface MediaKeySystemMediaCapability {
     robustness?: string;
 }
 
+interface MediaStreamAudioSourceOptions {
+    mediaStream: MediaStream;
+}
+
 interface MediaStreamConstraints {
     audio?: boolean | MediaTrackConstraints;
+    peerIdentity?: string;
     video?: boolean | MediaTrackConstraints;
 }
 
@@ -827,6 +948,10 @@ interface MediaStreamEventInit extends EventInit {
     stream?: MediaStream;
 }
 
+interface MediaStreamTrackAudioSourceOptions {
+    mediaStreamTrack: MediaStreamTrack;
+}
+
 interface MediaStreamTrackEventInit extends EventInit {
     track?: MediaStreamTrack | null;
 }
@@ -933,28 +1058,60 @@ interface MutationObserverInit {
     subtree?: boolean;
 }
 
+interface NavigationPreloadState {
+    enabled?: boolean;
+    headerValue?: string;
+}
+
+interface NotificationAction {
+    action: string;
+    icon?: string;
+    title: string;
+}
+
 interface NotificationEventInit extends ExtendableEventInit {
     action?: string;
     notification: Notification;
 }
 
 interface NotificationOptions {
+    actions?: NotificationAction[];
+    badge?: string;
     body?: string;
     data?: any;
     dir?: NotificationDirection;
     icon?: string;
+    image?: string;
     lang?: string;
+    renotify?: boolean;
+    requireInteraction?: boolean;
+    silent?: boolean;
     tag?: string;
-}
-
-interface ObjectURLOptions {
-    oneTimeOnly?: boolean;
+    timestamp?: number;
+    vibrate?: VibratePattern;
 }
 
 interface OfflineAudioCompletionEventInit extends EventInit {
     renderedBuffer: AudioBuffer;
 }
 
+interface OfflineAudioContextOptions {
+    length: number;
+    numberOfChannels?: number;
+    sampleRate: number;
+}
+
+interface OptionalEffectTiming {
+    delay?: number;
+    direction?: PlaybackDirection;
+    duration?: number | string;
+    easing?: string;
+    endDelay?: number;
+    fill?: FillMode;
+    iterationStart?: number;
+    iterations?: number;
+}
+
 interface OscillatorOptions extends AudioNodeOptions {
     detune?: number;
     frequency?: number;
@@ -1040,7 +1197,12 @@ interface PaymentShippingOption {
 interface Pbkdf2Params extends Algorithm {
     hash: string | Algorithm;
     iterations: number;
-    salt: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
+    salt: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer;
+}
+
+interface PerformanceObserverInit {
+    buffered?: boolean;
+    entryTypes: string[];
 }
 
 interface PeriodicWaveConstraints {
@@ -1048,8 +1210,8 @@ interface PeriodicWaveConstraints {
 }
 
 interface PeriodicWaveOptions extends PeriodicWaveConstraints {
-    imag?: number[];
-    real?: number[];
+    imag?: number[] | Float32Array;
+    real?: number[] | Float32Array;
 }
 
 interface PointerEventInit extends MouseEventInit {
@@ -1058,8 +1220,10 @@ interface PointerEventInit extends MouseEventInit {
     pointerId?: number;
     pointerType?: string;
     pressure?: number;
+    tangentialPressure?: number;
     tiltX?: number;
     tiltY?: number;
+    twist?: number;
     width?: number;
 }
 
@@ -1079,8 +1243,19 @@ interface ProgressEventInit extends EventInit {
     total?: number;
 }
 
+interface PromiseRejectionEventInit extends EventInit {
+    promise: Promise<any>;
+    reason?: any;
+}
+
+interface PropertyIndexedKeyframes extends Record<keyof CSSStyleDeclaration, string | string[]> {
+    composite?: CompositeOperation | (CompositeOperation | null)[];
+    easing?: string | string[];
+    offset?: number | (number | null)[];
+}
+
 interface PushEventInit extends ExtendableEventInit {
-    data?: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | string | null;
+    data?: PushMessageDataInit;
 }
 
 interface PushSubscriptionChangeInit extends ExtendableEventInit {
@@ -1088,8 +1263,14 @@ interface PushSubscriptionChangeInit extends ExtendableEventInit {
     oldSubscription?: PushSubscription;
 }
 
+interface PushSubscriptionJSON {
+    endpoint?: string;
+    expirationTime?: number | null;
+    keys?: Record<string, string>;
+}
+
 interface PushSubscriptionOptionsInit {
-    applicationServerKey?: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | string | null;
+    applicationServerKey?: BufferSource | string;
     userVisibleOnly?: boolean;
 }
 
@@ -1098,15 +1279,39 @@ interface QueuingStrategy {
     size?: WritableStreamChunkCallback;
 }
 
+interface RTCAnswerOptions extends RTCOfferAnswerOptions {
+}
+
+interface RTCCertificateExpiration {
+    expires?: number;
+}
+
 interface RTCConfiguration {
     bundlePolicy?: RTCBundlePolicy;
+    certificates?: RTCCertificate[];
+    iceCandidatePoolSize?: number;
     iceServers?: RTCIceServer[];
     iceTransportPolicy?: RTCIceTransportPolicy;
     peerIdentity?: string;
+    rtcpMuxPolicy?: RTCRtcpMuxPolicy;
 }
 
 interface RTCDTMFToneChangeEventInit extends EventInit {
-    tone?: string;
+    tone: string;
+}
+
+interface RTCDataChannelEventInit extends EventInit {
+    channel: RTCDataChannel;
+}
+
+interface RTCDataChannelInit {
+    id?: number;
+    maxPacketLifeTime?: number;
+    maxRetransmits?: number;
+    negotiated?: boolean;
+    ordered?: boolean;
+    priority?: RTCPriorityType;
+    protocol?: string;
 }
 
 interface RTCDtlsFingerprint {
@@ -1119,6 +1324,10 @@ interface RTCDtlsParameters {
     role?: RTCDtlsRole;
 }
 
+interface RTCErrorEventInit extends EventInit {
+    error?: RTCError | null;
+}
+
 interface RTCIceCandidateAttributes extends RTCStats {
     addressSourceUrl?: string;
     candidateType?: RTCStatsIceCandidateType;
@@ -1146,13 +1355,14 @@ interface RTCIceCandidateDictionary {
 
 interface RTCIceCandidateInit {
     candidate?: string;
-    sdpMLineIndex?: number;
-    sdpMid?: string;
+    sdpMLineIndex?: number | null;
+    sdpMid?: string | null;
+    usernameFragment?: string;
 }
 
 interface RTCIceCandidatePair {
-    local?: RTCIceCandidateDictionary;
-    remote?: RTCIceCandidateDictionary;
+    local?: RTCIceCandidate;
+    remote?: RTCIceCandidate;
 }
 
 interface RTCIceCandidatePairStats extends RTCStats {
@@ -1178,15 +1388,41 @@ interface RTCIceGatherOptions {
 }
 
 interface RTCIceParameters {
-    iceLite?: boolean | null;
     password?: string;
     usernameFragment?: string;
 }
 
 interface RTCIceServer {
-    credential?: string | null;
-    urls?: any;
-    username?: string | null;
+    credential?: string | RTCOAuthCredential;
+    credentialType?: RTCIceCredentialType;
+    urls: string | string[];
+    username?: string;
+}
+
+interface RTCIdentityAssertionResult {
+    assertion: string;
+    idp: RTCIdentityProviderDetails;
+}
+
+interface RTCIdentityProvider {
+    generateAssertion: GenerateAssertionCallback;
+    validateAssertion: ValidateAssertionCallback;
+}
+
+interface RTCIdentityProviderDetails {
+    domain: string;
+    protocol?: string;
+}
+
+interface RTCIdentityProviderOptions {
+    peerIdentity?: string;
+    protocol?: string;
+    usernameHint?: string;
+}
+
+interface RTCIdentityValidationResult {
+    contents: string;
+    identity: string;
 }
 
 interface RTCInboundRTPStreamStats extends RTCRTPStreamStats {
@@ -1214,13 +1450,21 @@ interface RTCMediaStreamTrackStats extends RTCStats {
     trackIdentifier?: string;
 }
 
-interface RTCOfferOptions {
-    iceRestart?: boolean;
-    offerToReceiveAudio?: number;
-    offerToReceiveVideo?: number;
+interface RTCOAuthCredential {
+    accessToken: string;
+    macKey: string;
+}
+
+interface RTCOfferAnswerOptions {
     voiceActivityDetection?: boolean;
 }
 
+interface RTCOfferOptions extends RTCOfferAnswerOptions {
+    iceRestart?: boolean;
+    offerToReceiveAudio?: boolean;
+    offerToReceiveVideo?: boolean;
+}
+
 interface RTCOutboundRTPStreamStats extends RTCRTPStreamStats {
     bytesSent?: number;
     packetsSent?: number;
@@ -1228,8 +1472,16 @@ interface RTCOutboundRTPStreamStats extends RTCRTPStreamStats {
     targetBitrate?: number;
 }
 
+interface RTCPeerConnectionIceErrorEventInit extends EventInit {
+    errorCode: number;
+    hostCandidate?: string;
+    statusText?: string;
+    url?: string;
+}
+
 interface RTCPeerConnectionIceEventInit extends EventInit {
-    candidate?: RTCIceCandidate;
+    candidate?: RTCIceCandidate | null;
+    url?: string | null;
 }
 
 interface RTCRTPStreamStats extends RTCStats {
@@ -1253,65 +1505,51 @@ interface RTCRtcpFeedback {
 
 interface RTCRtcpParameters {
     cname?: string;
-    mux?: boolean;
     reducedSize?: boolean;
-    ssrc?: number;
 }
 
 interface RTCRtpCapabilities {
-    codecs?: RTCRtpCodecCapability[];
-    fecMechanisms?: string[];
-    headerExtensions?: RTCRtpHeaderExtension[];
+    codecs: RTCRtpCodecCapability[];
+    headerExtensions: RTCRtpHeaderExtensionCapability[];
 }
 
 interface RTCRtpCodecCapability {
-    clockRate?: number;
-    kind?: string;
-    maxSpatialLayers?: number;
-    maxTemporalLayers?: number;
-    maxptime?: number;
-    name?: string;
-    numChannels?: number;
-    options?: any;
-    parameters?: any;
-    preferredPayloadType?: number;
-    ptime?: number;
-    rtcpFeedback?: RTCRtcpFeedback[];
-    svcMultiStreamSupport?: boolean;
+    channels?: number;
+    clockRate: number;
+    mimeType: string;
+    sdpFmtpLine?: string;
 }
 
 interface RTCRtpCodecParameters {
-    clockRate?: number;
-    maxptime?: number;
-    name?: string;
-    numChannels?: number;
-    parameters?: any;
-    payloadType?: number;
-    ptime?: number;
-    rtcpFeedback?: RTCRtcpFeedback[];
+    channels?: number;
+    clockRate: number;
+    mimeType: string;
+    payloadType: number;
+    sdpFmtpLine?: string;
+}
+
+interface RTCRtpCodingParameters {
+    rid?: string;
 }
 
 interface RTCRtpContributingSource {
     audioLevel?: number;
-    csrc?: number;
-    timestamp?: number;
+    source: number;
+    timestamp: number;
 }
 
-interface RTCRtpEncodingParameters {
+interface RTCRtpDecodingParameters extends RTCRtpCodingParameters {
+}
+
+interface RTCRtpEncodingParameters extends RTCRtpCodingParameters {
     active?: boolean;
     codecPayloadType?: number;
-    dependencyEncodingIds?: string[];
-    encodingId?: string;
-    fec?: RTCRtpFecParameters;
-    framerateScale?: number;
+    dtx?: RTCDtxStatus;
     maxBitrate?: number;
     maxFramerate?: number;
-    minQuality?: number;
-    priority?: number;
-    resolutionScale?: number;
-    rtx?: RTCRtpRtxParameters;
-    ssrc?: number;
-    ssrcRange?: RTCSsrcRange;
+    priority?: RTCPriorityType;
+    ptime?: number;
+    scaleResolutionDownBy?: number;
 }
 
 interface RTCRtpFecParameters {
@@ -1326,25 +1564,46 @@ interface RTCRtpHeaderExtension {
     uri?: string;
 }
 
-interface RTCRtpHeaderExtensionParameters {
-    encrypt?: boolean;
-    id?: number;
+interface RTCRtpHeaderExtensionCapability {
     uri?: string;
 }
 
+interface RTCRtpHeaderExtensionParameters {
+    encrypted?: boolean;
+    id: number;
+    uri: string;
+}
+
 interface RTCRtpParameters {
-    codecs?: RTCRtpCodecParameters[];
-    degradationPreference?: RTCDegradationPreference;
-    encodings?: RTCRtpEncodingParameters[];
-    headerExtensions?: RTCRtpHeaderExtensionParameters[];
-    muxId?: string;
-    rtcp?: RTCRtcpParameters;
+    codecs: RTCRtpCodecParameters[];
+    headerExtensions: RTCRtpHeaderExtensionParameters[];
+    rtcp: RTCRtcpParameters;
+}
+
+interface RTCRtpReceiveParameters extends RTCRtpParameters {
+    encodings: RTCRtpDecodingParameters[];
 }
 
 interface RTCRtpRtxParameters {
     ssrc?: number;
 }
 
+interface RTCRtpSendParameters extends RTCRtpParameters {
+    degradationPreference?: RTCDegradationPreference;
+    encodings: RTCRtpEncodingParameters[];
+    transactionId: string;
+}
+
+interface RTCRtpSynchronizationSource extends RTCRtpContributingSource {
+    voiceActivityFlag?: boolean;
+}
+
+interface RTCRtpTransceiverInit {
+    direction?: RTCRtpTransceiverDirection;
+    sendEncodings?: RTCRtpEncodingParameters[];
+    streams?: MediaStream[];
+}
+
 interface RTCRtpUnhandled {
     muxId?: string;
     payloadType?: number;
@@ -1353,7 +1612,7 @@ interface RTCRtpUnhandled {
 
 interface RTCSessionDescriptionInit {
     sdp?: string;
-    type?: RTCSdpType;
+    type: RTCSdpType;
 }
 
 interface RTCSrtpKeyParam {
@@ -1377,15 +1636,25 @@ interface RTCSsrcRange {
 }
 
 interface RTCStats {
-    id?: string;
-    msType?: MSStatsType;
-    timestamp?: number;
-    type?: RTCStatsType;
+    id: string;
+    timestamp: number;
+    type: RTCStatsType;
+}
+
+interface RTCStatsEventInit extends EventInit {
+    report: RTCStatsReport;
 }
 
 interface RTCStatsReport {
 }
 
+interface RTCTrackEventInit extends EventInit {
+    receiver: RTCRtpReceiver;
+    streams?: MediaStream[];
+    track: MediaStreamTrack;
+    transceiver: RTCRtpTransceiver;
+}
+
 interface RTCTransportStats extends RTCStats {
     activeConnection?: boolean;
     bytesReceived?: number;
@@ -1398,10 +1667,12 @@ interface RTCTransportStats extends RTCStats {
 
 interface RegistrationOptions {
     scope?: string;
+    type?: WorkerType;
+    updateViaCache?: ServiceWorkerUpdateViaCache;
 }
 
 interface RequestInit {
-    body?: Blob | Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | FormData | string | null;
+    body?: BodyInit | null;
     cache?: RequestCache;
     credentials?: RequestCredentials;
     headers?: HeadersInit;
@@ -1412,7 +1683,7 @@ interface RequestInit {
     redirect?: RequestRedirect;
     referrer?: string;
     referrerPolicy?: ReferrerPolicy;
-    signal?: AbortSignal;
+    signal?: AbortSignal | null;
     window?: any;
 }
 
@@ -1445,7 +1716,7 @@ interface RsaKeyGenParams extends Algorithm {
 }
 
 interface RsaOaepParams extends Algorithm {
-    label?: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
+    label?: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer;
 }
 
 interface RsaOtherPrimesInfo {
@@ -1476,6 +1747,20 @@ interface ScopedCredentialParameters {
     type: ScopedCredentialType;
 }
 
+interface ScrollIntoViewOptions extends ScrollOptions {
+    block?: ScrollLogicalPosition;
+    inline?: ScrollLogicalPosition;
+}
+
+interface ScrollOptions {
+    behavior?: ScrollBehavior;
+}
+
+interface ScrollToOptions extends ScrollOptions {
+    left?: number;
+    top?: number;
+}
+
 interface SecurityPolicyViolationEventInit extends EventInit {
     blockedURI?: string;
     columnNumber?: number;
@@ -1509,6 +1794,19 @@ interface StereoPannerOptions extends AudioNodeOptions {
     pan?: number;
 }
 
+interface StorageEstimate {
+    quota?: number;
+    usage?: number;
+}
+
+interface StorageEventInit extends EventInit {
+    key?: string | null;
+    newValue?: string | null;
+    oldValue?: string | null;
+    storageArea?: Storage | null;
+    url?: string;
+}
+
 interface StoreExceptionsInformation extends ExceptionInformation {
     detailURI?: string | null;
     explanationString?: string | null;
@@ -1533,6 +1831,30 @@ interface TextDecoderOptions {
     ignoreBOM?: boolean;
 }
 
+interface TouchEventInit extends EventModifierInit {
+    changedTouches?: Touch[];
+    targetTouches?: Touch[];
+    touches?: Touch[];
+}
+
+interface TouchInit {
+    altitudeAngle?: number;
+    azimuthAngle?: number;
+    clientX?: number;
+    clientY?: number;
+    force?: number;
+    identifier: number;
+    pageX?: number;
+    pageY?: number;
+    radiusX?: number;
+    radiusY?: number;
+    rotationAngle?: number;
+    screenX?: number;
+    screenY?: number;
+    target: EventTarget;
+    touchType?: TouchType;
+}
+
 interface TrackEventInit extends EventInit {
     track?: VideoTrack | AudioTrack | TextTrack | null;
 }
@@ -1540,6 +1862,7 @@ interface TrackEventInit extends EventInit {
 interface TransitionEventInit extends EventInit {
     elapsedTime?: number;
     propertyName?: string;
+    pseudoElement?: string;
 }
 
 interface UIEventInit extends EventInit {
@@ -1560,8 +1883,8 @@ interface VRDisplayEventInit extends EventInit {
 }
 
 interface VRLayer {
-    leftBounds?: number[] | null;
-    rightBounds?: number[] | null;
+    leftBounds?: number[] | Float32Array | null;
+    rightBounds?: number[] | Float32Array | null;
     source?: HTMLCanvasElement | null;
 }
 
@@ -1572,7 +1895,7 @@ interface VRStageParameters {
 }
 
 interface WaveShaperOptions extends AudioNodeOptions {
-    curve?: number[];
+    curve?: number[] | Float32Array;
     oversample?: OverSampleType;
 }
 
@@ -1600,16 +1923,14 @@ interface WheelEventInit extends MouseEventInit {
     deltaZ?: number;
 }
 
+interface WorkletOptions {
+    credentials?: RequestCredentials;
+}
+
 interface EventListener {
     (evt: Event): void;
 }
 
-type WebKitEntriesCallback = ((entries: WebKitEntry[]) => void) | { handleEvent(entries: WebKitEntry[]): void; };
-
-type WebKitErrorCallback = ((err: DOMError) => void) | { handleEvent(err: DOMError): void; };
-
-type WebKitFileCallback = ((file: File) => void) | { handleEvent(file: File): void; };
-
 interface ANGLE_instanced_arrays {
     drawArraysInstancedANGLE(mode: number, first: number, count: number, primcount: number): void;
     drawElementsInstancedANGLE(mode: number, count: number, type: number, offset: number, primcount: number): void;
@@ -1685,67 +2006,71 @@ interface AnalyserNode extends AudioNode {
 
 declare var AnalyserNode: {
     prototype: AnalyserNode;
-    new(): AnalyserNode;
+    new(context: BaseAudioContext, options?: AnalyserOptions): AnalyserNode;
 };
 
-interface Animation {
+interface Animatable {
+    animate(keyframes: Keyframe[] | PropertyIndexedKeyframes | null, options?: number | KeyframeAnimationOptions): Animation;
+    getAnimations(): Animation[];
+}
+
+interface AnimationEventMap {
+    "cancel": AnimationPlaybackEvent;
+    "finish": AnimationPlaybackEvent;
+}
+
+interface Animation extends EventTarget {
     currentTime: number | null;
-    effect: AnimationEffectReadOnly;
+    effect: AnimationEffect | null;
     readonly finished: Promise<Animation>;
     id: string;
+    oncancel: ((this: Animation, ev: AnimationPlaybackEvent) => any) | null;
+    onfinish: ((this: Animation, ev: AnimationPlaybackEvent) => any) | null;
     readonly pending: boolean;
-    readonly playState: "idle" | "running" | "paused" | "finished";
+    readonly playState: AnimationPlayState;
     playbackRate: number;
     readonly ready: Promise<Animation>;
-    startTime: number;
-    timeline: AnimationTimeline;
+    startTime: number | null;
+    timeline: AnimationTimeline | null;
     cancel(): void;
     finish(): void;
-    oncancel: (this: Animation, ev: AnimationPlaybackEvent) => any;
-    onfinish: (this: Animation, ev: AnimationPlaybackEvent) => any;
     pause(): void;
     play(): void;
     reverse(): void;
+    updatePlaybackRate(playbackRate: number): void;
+    addEventListener<K extends keyof AnimationEventMap>(type: K, listener: (this: Animation, ev: AnimationEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
+    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
+    removeEventListener<K extends keyof AnimationEventMap>(type: K, listener: (this: Animation, ev: AnimationEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
+    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
 }
 
 declare var Animation: {
     prototype: Animation;
-    new(effect?: AnimationEffectReadOnly, timeline?: AnimationTimeline): Animation;
+    new(effect?: AnimationEffect | null, timeline?: AnimationTimeline | null): Animation;
 };
 
-interface AnimationEffectReadOnly {
-    readonly timing: number;
-    getComputedTiming(): ComputedTimingProperties;
+interface AnimationEffect {
+    getComputedTiming(): ComputedEffectTiming;
+    getTiming(): EffectTiming;
+    updateTiming(timing?: OptionalEffectTiming): void;
 }
 
+declare var AnimationEffect: {
+    prototype: AnimationEffect;
+    new(): AnimationEffect;
+};
+
 interface AnimationEvent extends Event {
     readonly animationName: string;
     readonly elapsedTime: number;
+    readonly pseudoElement: string;
 }
 
 declare var AnimationEvent: {
     prototype: AnimationEvent;
-    new(typeArg: string, eventInitDict?: AnimationEventInit): AnimationEvent;
+    new(type: string, animationEventInitDict?: AnimationEventInit): AnimationEvent;
 };
 
-interface AnimationKeyFrame {
-    easing?: string | string[];
-    offset?: number | null | (number | null)[];
-    [index: string]: string | number | number[] | string[] | null | (number | null)[] | undefined;
-}
-
-interface AnimationOptions {
-    delay?: number;
-    direction?: "normal" | "reverse" | "alternate" | "alternate-reverse";
-    duration?: number;
-    easing?: string;
-    endDelay?: number;
-    fill?: "none" | "forwards" | "backwards" | "both"| "auto";
-    id?: string;
-    iterationStart?: number;
-    iterations?: number;
-}
-
 interface AnimationPlaybackEvent extends Event {
     readonly currentTime: number | null;
     readonly timelineTime: number | null;
@@ -1756,15 +2081,15 @@ declare var AnimationPlaybackEvent: {
     new(type: string, eventInitDict?: AnimationPlaybackEventInit): AnimationPlaybackEvent;
 };
 
-interface AnimationPlaybackEventInit extends EventInit {
-    currentTime?: number | null;
-    timelineTime?: number | null;
-}
-
 interface AnimationTimeline {
     readonly currentTime: number | null;
 }
 
+declare var AnimationTimeline: {
+    prototype: AnimationTimeline;
+    new(): AnimationTimeline;
+};
+
 interface ApplicationCacheEventMap {
     "cached": Event;
     "checking": Event;
@@ -1841,80 +2166,47 @@ interface AudioBuffer {
 
 declare var AudioBuffer: {
     prototype: AudioBuffer;
-    new(): AudioBuffer;
+    new(options: AudioBufferOptions): AudioBuffer;
 };
 
-interface AudioBufferSourceNodeEventMap {
-    "ended": Event;
-}
-
-interface AudioBufferSourceNode extends AudioNode {
+interface AudioBufferSourceNode extends AudioScheduledSourceNode {
     buffer: AudioBuffer | null;
     readonly detune: AudioParam;
     loop: boolean;
     loopEnd: number;
     loopStart: number;
-    onended: ((this: AudioBufferSourceNode, ev: Event) => any) | null;
     readonly playbackRate: AudioParam;
     start(when?: number, offset?: number, duration?: number): void;
-    stop(when?: number): void;
-    addEventListener<K extends keyof AudioBufferSourceNodeEventMap>(type: K, listener: (this: AudioBufferSourceNode, ev: AudioBufferSourceNodeEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
+    addEventListener<K extends keyof AudioScheduledSourceNodeEventMap>(type: K, listener: (this: AudioBufferSourceNode, ev: AudioScheduledSourceNodeEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
     addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof AudioBufferSourceNodeEventMap>(type: K, listener: (this: AudioBufferSourceNode, ev: AudioBufferSourceNodeEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
+    removeEventListener<K extends keyof AudioScheduledSourceNodeEventMap>(type: K, listener: (this: AudioBufferSourceNode, ev: AudioScheduledSourceNodeEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
     removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
 }
 
 declare var AudioBufferSourceNode: {
     prototype: AudioBufferSourceNode;
-    new(): AudioBufferSourceNode;
+    new(context: BaseAudioContext, options?: AudioBufferSourceOptions): AudioBufferSourceNode;
 };
 
-interface AudioContextEventMap {
-    "statechange": Event;
-}
-
-interface AudioContextBase extends EventTarget {
-    readonly currentTime: number;
-    readonly destination: AudioDestinationNode;
-    readonly listener: AudioListener;
-    onstatechange: ((this: AudioContext, ev: Event) => any) | null;
-    readonly sampleRate: number;
-    readonly state: AudioContextState;
+interface AudioContext extends BaseAudioContext {
+    readonly baseLatency: number;
+    readonly outputLatency: number;
     close(): Promise<void>;
-    createAnalyser(): AnalyserNode;
-    createBiquadFilter(): BiquadFilterNode;
-    createBuffer(numberOfChannels: number, length: number, sampleRate: number): AudioBuffer;
-    createBufferSource(): AudioBufferSourceNode;
-    createChannelMerger(numberOfInputs?: number): ChannelMergerNode;
-    createChannelSplitter(numberOfOutputs?: number): ChannelSplitterNode;
-    createConvolver(): ConvolverNode;
-    createDelay(maxDelayTime?: number): DelayNode;
-    createDynamicsCompressor(): DynamicsCompressorNode;
-    createGain(): GainNode;
-    createIIRFilter(feedforward: number[], feedback: number[]): IIRFilterNode;
     createMediaElementSource(mediaElement: HTMLMediaElement): MediaElementAudioSourceNode;
+    createMediaStreamDestination(): MediaStreamAudioDestinationNode;
     createMediaStreamSource(mediaStream: MediaStream): MediaStreamAudioSourceNode;
-    createOscillator(): OscillatorNode;
-    createPanner(): PannerNode;
-    createPeriodicWave(real: Float32Array, imag: Float32Array, constraints?: PeriodicWaveConstraints): PeriodicWave;
-    createScriptProcessor(bufferSize?: number, numberOfInputChannels?: number, numberOfOutputChannels?: number): ScriptProcessorNode;
-    createStereoPanner(): StereoPannerNode;
-    createWaveShaper(): WaveShaperNode;
-    decodeAudioData(audioData: ArrayBuffer, successCallback?: DecodeSuccessCallback, errorCallback?: DecodeErrorCallback): Promise<AudioBuffer>;
-    resume(): Promise<void>;
-    addEventListener<K extends keyof AudioContextEventMap>(type: K, listener: (this: AudioContext, ev: AudioContextEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof AudioContextEventMap>(type: K, listener: (this: AudioContext, ev: AudioContextEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-interface AudioContext extends AudioContextBase {
+    createMediaStreamTrackSource(mediaStreamTrack: MediaStreamTrack): MediaStreamTrackAudioSourceNode;
+    getOutputTimestamp(): AudioTimestamp;
     suspend(): Promise<void>;
+    addEventListener<K extends keyof BaseAudioContextEventMap>(type: K, listener: (this: AudioContext, ev: BaseAudioContextEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
+    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
+    removeEventListener<K extends keyof BaseAudioContextEventMap>(type: K, listener: (this: AudioContext, ev: BaseAudioContextEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
+    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
 }
 
 declare var AudioContext: {
     prototype: AudioContext;
-    new(): AudioContext;
+    new(contextOptions?: AudioContextOptions): AudioContext;
 };
 
 interface AudioDestinationNode extends AudioNode {
@@ -1927,16 +2219,19 @@ declare var AudioDestinationNode: {
 };
 
 interface AudioListener {
-    /** @deprecated */
-    dopplerFactor: number;
-    /** @deprecated */
-    speedOfSound: number;
+    readonly forwardX: AudioParam;
+    readonly forwardY: AudioParam;
+    readonly forwardZ: AudioParam;
+    readonly positionX: AudioParam;
+    readonly positionY: AudioParam;
+    readonly positionZ: AudioParam;
+    readonly upX: AudioParam;
+    readonly upY: AudioParam;
+    readonly upZ: AudioParam;
     /** @deprecated */
     setOrientation(x: number, y: number, z: number, xUp: number, yUp: number, zUp: number): void;
     /** @deprecated */
     setPosition(x: number, y: number, z: number): void;
-    /** @deprecated */
-    setVelocity(x: number, y: number, z: number): void;
 }
 
 declare var AudioListener: {
@@ -1948,18 +2243,18 @@ interface AudioNode extends EventTarget {
     channelCount: number;
     channelCountMode: ChannelCountMode;
     channelInterpretation: ChannelInterpretation;
-    readonly context: AudioContext;
+    readonly context: BaseAudioContext;
     readonly numberOfInputs: number;
     readonly numberOfOutputs: number;
-    connect(destination: AudioNode, output?: number, input?: number): AudioNode;
-    connect(destination: AudioParam, output?: number): void;
+    connect(destinationNode: AudioNode, output?: number, input?: number): AudioNode;
+    connect(destinationParam: AudioParam, output?: number): void;
     disconnect(): void;
     disconnect(output: number): void;
-    disconnect(destination: AudioNode): void;
-    disconnect(destination: AudioNode, output: number): void;
-    disconnect(destination: AudioNode, output: number, input: number): void;
-    disconnect(destination: AudioParam): void;
-    disconnect(destination: AudioParam, output: number): void;
+    disconnect(destinationNode: AudioNode): void;
+    disconnect(destinationNode: AudioNode, output: number): void;
+    disconnect(destinationNode: AudioNode, output: number, input: number): void;
+    disconnect(destinationParam: AudioParam): void;
+    disconnect(destinationParam: AudioParam, output: number): void;
 }
 
 declare var AudioNode: {
@@ -1968,14 +2263,18 @@ declare var AudioNode: {
 };
 
 interface AudioParam {
+    automationRate: AutomationRate;
     readonly defaultValue: number;
+    readonly maxValue: number;
+    readonly minValue: number;
     value: number;
+    cancelAndHoldAtTime(cancelTime: number): AudioParam;
     cancelScheduledValues(cancelTime: number): AudioParam;
     exponentialRampToValueAtTime(value: number, endTime: number): AudioParam;
     linearRampToValueAtTime(value: number, endTime: number): AudioParam;
     setTargetAtTime(target: number, startTime: number, timeConstant: number): AudioParam;
     setValueAtTime(value: number, startTime: number): AudioParam;
-    setValueCurveAtTime(values: number[], startTime: number, duration: number): AudioParam;
+    setValueCurveAtTime(values: number[] | Float32Array, startTime: number, duration: number): AudioParam;
 }
 
 declare var AudioParam: {
@@ -1983,6 +2282,15 @@ declare var AudioParam: {
     new(): AudioParam;
 };
 
+interface AudioParamMap {
+    forEach(callbackfn: (value: AudioParam, key: string, parent: AudioParamMap) => void, thisArg?: any): void;
+}
+
+declare var AudioParamMap: {
+    prototype: AudioParamMap;
+    new(): AudioParamMap;
+};
+
 interface AudioProcessingEvent extends Event {
     readonly inputBuffer: AudioBuffer;
     readonly outputBuffer: AudioBuffer;
@@ -1991,7 +2299,26 @@ interface AudioProcessingEvent extends Event {
 
 declare var AudioProcessingEvent: {
     prototype: AudioProcessingEvent;
-    new(): AudioProcessingEvent;
+    new(type: string, eventInitDict: AudioProcessingEventInit): AudioProcessingEvent;
+};
+
+interface AudioScheduledSourceNodeEventMap {
+    "ended": Event;
+}
+
+interface AudioScheduledSourceNode extends AudioNode {
+    onended: ((this: AudioScheduledSourceNode, ev: Event) => any) | null;
+    start(when?: number): void;
+    stop(when?: number): void;
+    addEventListener<K extends keyof AudioScheduledSourceNodeEventMap>(type: K, listener: (this: AudioScheduledSourceNode, ev: AudioScheduledSourceNodeEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
+    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
+    removeEventListener<K extends keyof AudioScheduledSourceNodeEventMap>(type: K, listener: (this: AudioScheduledSourceNode, ev: AudioScheduledSourceNodeEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
+    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
+}
+
+declare var AudioScheduledSourceNode: {
+    prototype: AudioScheduledSourceNode;
+    new(): AudioScheduledSourceNode;
 };
 
 interface AudioTrack {
@@ -2033,6 +2360,33 @@ declare var AudioTrackList: {
     new(): AudioTrackList;
 };
 
+interface AudioWorklet extends Worklet {
+}
+
+declare var AudioWorklet: {
+    prototype: AudioWorklet;
+    new(): AudioWorklet;
+};
+
+interface AudioWorkletNodeEventMap {
+    "processorerror": Event;
+}
+
+interface AudioWorkletNode extends AudioNode {
+    onprocessorerror: ((this: AudioWorkletNode, ev: Event) => any) | null;
+    readonly parameters: AudioParamMap;
+    readonly port: MessagePort;
+    addEventListener<K extends keyof AudioWorkletNodeEventMap>(type: K, listener: (this: AudioWorkletNode, ev: AudioWorkletNodeEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
+    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
+    removeEventListener<K extends keyof AudioWorkletNodeEventMap>(type: K, listener: (this: AudioWorkletNode, ev: AudioWorkletNodeEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
+    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
+}
+
+declare var AudioWorkletNode: {
+    prototype: AudioWorkletNode;
+    new(context: BaseAudioContext, name: string, options?: AudioWorkletNodeOptions): AudioWorkletNode;
+};
+
 interface BarProp {
     readonly visible: boolean;
 }
@@ -2042,6 +2396,49 @@ declare var BarProp: {
     new(): BarProp;
 };
 
+interface BaseAudioContextEventMap {
+    "statechange": Event;
+}
+
+interface BaseAudioContext extends EventTarget {
+    readonly audioWorklet: AudioWorklet;
+    readonly currentTime: number;
+    readonly destination: AudioDestinationNode;
+    readonly listener: AudioListener;
+    onstatechange: ((this: BaseAudioContext, ev: Event) => any) | null;
+    readonly sampleRate: number;
+    readonly state: AudioContextState;
+    createAnalyser(): AnalyserNode;
+    createBiquadFilter(): BiquadFilterNode;
+    createBuffer(numberOfChannels: number, length: number, sampleRate: number): AudioBuffer;
+    createBufferSource(): AudioBufferSourceNode;
+    createChannelMerger(numberOfInputs?: number): ChannelMergerNode;
+    createChannelSplitter(numberOfOutputs?: number): ChannelSplitterNode;
+    createConstantSource(): ConstantSourceNode;
+    createConvolver(): ConvolverNode;
+    createDelay(maxDelayTime?: number): DelayNode;
+    createDynamicsCompressor(): DynamicsCompressorNode;
+    createGain(): GainNode;
+    createIIRFilter(feedforward: number[], feedback: number[]): IIRFilterNode;
+    createOscillator(): OscillatorNode;
+    createPanner(): PannerNode;
+    createPeriodicWave(real: number[] | Float32Array, imag: number[] | Float32Array, constraints?: PeriodicWaveConstraints): PeriodicWave;
+    createScriptProcessor(bufferSize?: number, numberOfInputChannels?: number, numberOfOutputChannels?: number): ScriptProcessorNode;
+    createStereoPanner(): StereoPannerNode;
+    createWaveShaper(): WaveShaperNode;
+    decodeAudioData(audioData: ArrayBuffer, successCallback?: DecodeSuccessCallback, errorCallback?: DecodeErrorCallback): Promise<AudioBuffer>;
+    resume(): Promise<void>;
+    addEventListener<K extends keyof BaseAudioContextEventMap>(type: K, listener: (this: BaseAudioContext, ev: BaseAudioContextEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
+    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
+    removeEventListener<K extends keyof BaseAudioContextEventMap>(type: K, listener: (this: BaseAudioContext, ev: BaseAudioContextEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
+    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
+}
+
+declare var BaseAudioContext: {
+    prototype: BaseAudioContext;
+    new(): BaseAudioContext;
+};
+
 interface BeforeUnloadEvent extends Event {
     returnValue: any;
 }
@@ -2084,28 +2481,22 @@ interface BiquadFilterNode extends AudioNode {
 
 declare var BiquadFilterNode: {
     prototype: BiquadFilterNode;
-    new(): BiquadFilterNode;
+    new(context: BaseAudioContext, options?: BiquadFilterOptions): BiquadFilterNode;
 };
 
 interface Blob {
     readonly size: number;
     readonly type: string;
-    msClose(): void;
-    msDetachStream(): any;
     slice(start?: number, end?: number, contentType?: string): Blob;
 }
 
 declare var Blob: {
     prototype: Blob;
-    new (blobParts?: any[], options?: BlobPropertyBag): Blob;
+    new(blobParts?: BlobPart[], options?: BlobPropertyBag): Blob;
 };
 
-interface BlobPropertyBag {
-    endings?: string;
-    type?: string;
-}
-
 interface Body {
+    readonly body: ReadableStream | null;
     readonly bodyUsed: boolean;
     arrayBuffer(): Promise<ArrayBuffer>;
     blob(): Promise<Blob>;
@@ -2114,14 +2505,28 @@ interface Body {
     text(): Promise<string>;
 }
 
+interface BroadcastChannelEventMap {
+    "message": MessageEvent;
+    "messageerror": MessageEvent;
+}
+
 interface BroadcastChannel extends EventTarget {
+    /**
+     * Returns the channel name (as passed to the constructor).
+     */
     readonly name: string;
-    onmessage: (ev: MessageEvent) => any;
-    onmessageerror: (ev: MessageEvent) => any;
+    onmessage: ((this: BroadcastChannel, ev: MessageEvent) => any) | null;
+    onmessageerror: ((this: BroadcastChannel, ev: MessageEvent) => any) | null;
+    /**
+     * Closes the BroadcastChannel object, opening it up to garbage collection.
+     */
+    close(): void;
+    /**
+     * Sends the given message to other BroadcastChannel objects set up for this channel. Messages can be structured objects, e.g. nested objects and arrays.
+     */
+    postMessage(message: any): void;
     addEventListener<K extends keyof BroadcastChannelEventMap>(type: K, listener: (this: BroadcastChannel, ev: BroadcastChannelEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
     addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    close(): void;
-    postMessage(message: any): void;
     removeEventListener<K extends keyof BroadcastChannelEventMap>(type: K, listener: (this: BroadcastChannel, ev: BroadcastChannelEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
     removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
 }
@@ -2214,8 +2619,8 @@ interface CSSKeyframesRule extends CSSRule {
     readonly cssRules: CSSRuleList;
     name: string;
     appendRule(rule: string): void;
-    deleteRule(rule: string): void;
-    findRule(rule: string): CSSKeyframeRule | null;
+    deleteRule(select: string): void;
+    findRule(select: string): CSSKeyframeRule | null;
 }
 
 declare var CSSKeyframesRule: {
@@ -2745,13 +3150,13 @@ declare var CSSSupportsRule: {
 };
 
 interface Cache {
-    add(request: Request | string): Promise<void>;
-    addAll(requests: (Request | string)[]): Promise<void>;
-    delete(request: Request | string, options?: CacheQueryOptions): Promise<boolean>;
-    keys(request?: Request | string, options?: CacheQueryOptions): Promise<Request[]>;
-    match(request: Request | string, options?: CacheQueryOptions): Promise<Response>;
-    matchAll(request?: Request | string, options?: CacheQueryOptions): Promise<Response[]>;
-    put(request: Request | string, response: Response): Promise<void>;
+    add(request: RequestInfo): Promise<void>;
+    addAll(requests: RequestInfo[]): Promise<void>;
+    delete(request: RequestInfo, options?: CacheQueryOptions): Promise<boolean>;
+    keys(request?: RequestInfo, options?: CacheQueryOptions): Promise<ReadonlyArray<Request>>;
+    match(request: RequestInfo, options?: CacheQueryOptions): Promise<Response | undefined>;
+    matchAll(request?: RequestInfo, options?: CacheQueryOptions): Promise<ReadonlyArray<Response>>;
+    put(request: RequestInfo, response: Response): Promise<void>;
 }
 
 declare var Cache: {
@@ -2763,7 +3168,7 @@ interface CacheStorage {
     delete(cacheName: string): Promise<boolean>;
     has(cacheName: string): Promise<boolean>;
     keys(): Promise<string[]>;
-    match(request: Request | string, options?: CacheQueryOptions): Promise<any>;
+    match(request: RequestInfo, options?: CacheQueryOptions): Promise<Response | undefined>;
     open(cacheName: string): Promise<Cache>;
 }
 
@@ -2881,7 +3286,7 @@ interface ChannelMergerNode extends AudioNode {
 
 declare var ChannelMergerNode: {
     prototype: ChannelMergerNode;
-    new(): ChannelMergerNode;
+    new(context: BaseAudioContext, options?: ChannelMergerOptions): ChannelMergerNode;
 };
 
 interface ChannelSplitterNode extends AudioNode {
@@ -2889,7 +3294,7 @@ interface ChannelSplitterNode extends AudioNode {
 
 declare var ChannelSplitterNode: {
     prototype: ChannelSplitterNode;
-    new(): ChannelSplitterNode;
+    new(context: BaseAudioContext, options?: ChannelSplitterOptions): ChannelSplitterNode;
 };
 
 interface CharacterData extends Node, ChildNode {
@@ -2983,14 +3388,6 @@ declare var CompositionEvent: {
     new(typeArg: string, eventInitDict?: CompositionEventInit): CompositionEvent;
 };
 
-interface ComputedTimingProperties {
-    activeDuration: number;
-    currentIteration: number | null;
-    endTime: number;
-    localTime: number | null;
-    progress: number | null;
-}
-
 interface ConcatParams extends Algorithm {
     algorithmId: Uint8Array;
     hash?: string | Algorithm;
@@ -3035,14 +3432,17 @@ declare var Console: {
     new(): Console;
 };
 
-interface ContentScriptGlobalScope extends EventTarget {
-    readonly msContentScript: ExtensionScriptApis;
-    readonly window: Window;
+interface ConstantSourceNode extends AudioScheduledSourceNode {
+    readonly offset: AudioParam;
+    addEventListener<K extends keyof AudioScheduledSourceNodeEventMap>(type: K, listener: (this: ConstantSourceNode, ev: AudioScheduledSourceNodeEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
+    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
+    removeEventListener<K extends keyof AudioScheduledSourceNodeEventMap>(type: K, listener: (this: ConstantSourceNode, ev: AudioScheduledSourceNodeEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
+    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
 }
 
-declare var ContentScriptGlobalScope: {
-    prototype: ContentScriptGlobalScope;
-    new(): ContentScriptGlobalScope;
+declare var ConstantSourceNode: {
+    prototype: ConstantSourceNode;
+    new(context: BaseAudioContext, options?: ConstantSourceOptions): ConstantSourceNode;
 };
 
 interface ConvolverNode extends AudioNode {
@@ -3052,7 +3452,7 @@ interface ConvolverNode extends AudioNode {
 
 declare var ConvolverNode: {
     prototype: ConvolverNode;
-    new(): ConvolverNode;
+    new(context: BaseAudioContext, options?: ConvolverOptions): ConvolverNode;
 };
 
 interface Coordinates {
@@ -3065,11 +3465,6 @@ interface Coordinates {
     readonly speed: number | null;
 }
 
-declare var Coordinates: {
-    prototype: Coordinates;
-    new(): Coordinates;
-};
-
 interface CountQueuingStrategy {
     highWaterMark: number;
     size(): number;
@@ -3082,7 +3477,7 @@ declare var CountQueuingStrategy: {
 
 interface Crypto {
     readonly subtle: SubtleCrypto;
-    getRandomValues(array: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | null): Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | null;
+    getRandomValues<T extends Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | null>(array: T): T;
 }
 
 declare var Crypto: {
@@ -3142,7 +3537,6 @@ interface DOMException {
     readonly code: number;
     readonly message: string;
     readonly name: string;
-    toString(): string;
     readonly ABORT_ERR: number;
     readonly DATA_CLONE_ERR: number;
     readonly DOMSTRING_SIZE_ERR: number;
@@ -3160,10 +3554,8 @@ interface DOMException {
     readonly NOT_SUPPORTED_ERR: number;
     readonly NO_DATA_ALLOWED_ERR: number;
     readonly NO_MODIFICATION_ALLOWED_ERR: number;
-    readonly PARSE_ERR: number;
     readonly QUOTA_EXCEEDED_ERR: number;
     readonly SECURITY_ERR: number;
-    readonly SERIALIZE_ERR: number;
     readonly SYNTAX_ERR: number;
     readonly TIMEOUT_ERR: number;
     readonly TYPE_MISMATCH_ERR: number;
@@ -3192,10 +3584,8 @@ declare var DOMException: {
     readonly NOT_SUPPORTED_ERR: number;
     readonly NO_DATA_ALLOWED_ERR: number;
     readonly NO_MODIFICATION_ALLOWED_ERR: number;
-    readonly PARSE_ERR: number;
     readonly QUOTA_EXCEEDED_ERR: number;
     readonly SECURITY_ERR: number;
-    readonly SERIALIZE_ERR: number;
     readonly SYNTAX_ERR: number;
     readonly TIMEOUT_ERR: number;
     readonly TYPE_MISMATCH_ERR: number;
@@ -3224,6 +3614,108 @@ interface DOML2DeprecatedSizeProperty {
     size: number;
 }
 
+interface DOMMatrix extends DOMMatrixReadOnly {
+    a: number;
+    b: number;
+    c: number;
+    d: number;
+    e: number;
+    f: number;
+    m11: number;
+    m12: number;
+    m13: number;
+    m14: number;
+    m21: number;
+    m22: number;
+    m23: number;
+    m24: number;
+    m31: number;
+    m32: number;
+    m33: number;
+    m34: number;
+    m41: number;
+    m42: number;
+    m43: number;
+    m44: number;
+    invertSelf(): DOMMatrix;
+    multiplySelf(other?: DOMMatrixInit): DOMMatrix;
+    preMultiplySelf(other?: DOMMatrixInit): DOMMatrix;
+    rotateAxisAngleSelf(x?: number, y?: number, z?: number, angle?: number): DOMMatrix;
+    rotateFromVectorSelf(x?: number, y?: number): DOMMatrix;
+    rotateSelf(rotX?: number, rotY?: number, rotZ?: number): DOMMatrix;
+    scale3dSelf(scale?: number, originX?: number, originY?: number, originZ?: number): DOMMatrix;
+    scaleSelf(scaleX?: number, scaleY?: number, scaleZ?: number, originX?: number, originY?: number, originZ?: number): DOMMatrix;
+    setMatrixValue(transformList: string): DOMMatrix;
+    skewXSelf(sx?: number): DOMMatrix;
+    skewYSelf(sy?: number): DOMMatrix;
+    translateSelf(tx?: number, ty?: number, tz?: number): DOMMatrix;
+}
+
+declare var DOMMatrix: {
+    prototype: DOMMatrix;
+    new(init?: string | number[]): DOMMatrix;
+    fromFloat32Array(array32: Float32Array): DOMMatrix;
+    fromFloat64Array(array64: Float64Array): DOMMatrix;
+    fromMatrix(other?: DOMMatrixInit): DOMMatrix;
+};
+
+type SVGMatrix = DOMMatrix;
+declare var SVGMatrix: typeof DOMMatrix;
+
+type WebKitCSSMatrix = DOMMatrix;
+declare var WebKitCSSMatrix: typeof DOMMatrix;
+
+interface DOMMatrixReadOnly {
+    readonly a: number;
+    readonly b: number;
+    readonly c: number;
+    readonly d: number;
+    readonly e: number;
+    readonly f: number;
+    readonly is2D: boolean;
+    readonly isIdentity: boolean;
+    readonly m11: number;
+    readonly m12: number;
+    readonly m13: number;
+    readonly m14: number;
+    readonly m21: number;
+    readonly m22: number;
+    readonly m23: number;
+    readonly m24: number;
+    readonly m31: number;
+    readonly m32: number;
+    readonly m33: number;
+    readonly m34: number;
+    readonly m41: number;
+    readonly m42: number;
+    readonly m43: number;
+    readonly m44: number;
+    flipX(): DOMMatrix;
+    flipY(): DOMMatrix;
+    inverse(): DOMMatrix;
+    multiply(other?: DOMMatrixInit): DOMMatrix;
+    rotate(rotX?: number, rotY?: number, rotZ?: number): DOMMatrix;
+    rotateAxisAngle(x?: number, y?: number, z?: number, angle?: number): DOMMatrix;
+    rotateFromVector(x?: number, y?: number): DOMMatrix;
+    scale(scaleX?: number, scaleY?: number, scaleZ?: number, originX?: number, originY?: number, originZ?: number): DOMMatrix;
+    scale3d(scale?: number, originX?: number, originY?: number, originZ?: number): DOMMatrix;
+    skewX(sx?: number): DOMMatrix;
+    skewY(sy?: number): DOMMatrix;
+    toFloat32Array(): Float32Array;
+    toFloat64Array(): Float64Array;
+    toJSON(): any;
+    transformPoint(point?: DOMPointInit): DOMPoint;
+    translate(tx?: number, ty?: number, tz?: number): DOMMatrix;
+}
+
+declare var DOMMatrixReadOnly: {
+    prototype: DOMMatrixReadOnly;
+    new(init?: string | number[]): DOMMatrixReadOnly;
+    fromFloat32Array(array32: Float32Array): DOMMatrixReadOnly;
+    fromFloat64Array(array64: Float64Array): DOMMatrixReadOnly;
+    fromMatrix(other?: DOMMatrixInit): DOMMatrixReadOnly;
+};
+
 interface DOMParser {
     parseFromString(source: string, mimeType: string): Document;
 }
@@ -3233,6 +3725,53 @@ declare var DOMParser: {
     new(): DOMParser;
 };
 
+interface DOMPoint extends DOMPointReadOnly {
+    w: number;
+    x: number;
+    y: number;
+    z: number;
+}
+
+declare var DOMPoint: {
+    prototype: DOMPoint;
+    new(x?: number, y?: number, z?: number, w?: number): DOMPoint;
+    fromPoint(other?: DOMPointInit): DOMPoint;
+};
+
+type SVGPoint = DOMPoint;
+declare var SVGPoint: typeof DOMPoint;
+
+interface DOMPointReadOnly {
+    readonly w: number;
+    readonly x: number;
+    readonly y: number;
+    readonly z: number;
+    matrixTransform(matrix?: DOMMatrixInit): DOMPoint;
+    toJSON(): any;
+}
+
+declare var DOMPointReadOnly: {
+    prototype: DOMPointReadOnly;
+    new(x?: number, y?: number, z?: number, w?: number): DOMPointReadOnly;
+    fromPoint(other?: DOMPointInit): DOMPointReadOnly;
+};
+
+interface DOMQuad {
+    readonly p1: DOMPoint;
+    readonly p2: DOMPoint;
+    readonly p3: DOMPoint;
+    readonly p4: DOMPoint;
+    getBounds(): DOMRect;
+    toJSON(): any;
+}
+
+declare var DOMQuad: {
+    prototype: DOMQuad;
+    new(p1?: DOMPointInit, p2?: DOMPointInit, p3?: DOMPointInit, p4?: DOMPointInit): DOMQuad;
+    fromQuad(other?: DOMQuadInit): DOMQuad;
+    fromRect(other?: DOMRectInit): DOMQuad;
+};
+
 interface DOMRect extends DOMRectReadOnly {
     height: number;
     width: number;
@@ -3242,16 +3781,24 @@ interface DOMRect extends DOMRectReadOnly {
 
 declare var DOMRect: {
     prototype: DOMRect;
-    new (x?: number, y?: number, width?: number, height?: number): DOMRect;
-    fromRect(rectangle?: DOMRectInit): DOMRect;
+    new(x?: number, y?: number, width?: number, height?: number): DOMRect;
+    fromRect(other?: DOMRectInit): DOMRect;
 };
 
+type SVGRect = DOMRect;
+declare var SVGRect: typeof DOMRect;
+
 interface DOMRectList {
     readonly length: number;
     item(index: number): DOMRect | null;
     [index: number]: DOMRect;
 }
 
+declare var DOMRectList: {
+    prototype: DOMRectList;
+    new(): DOMRectList;
+};
+
 interface DOMRectReadOnly {
     readonly bottom: number;
     readonly height: number;
@@ -3261,12 +3808,13 @@ interface DOMRectReadOnly {
     readonly width: number;
     readonly x: number;
     readonly y: number;
+    toJSON(): any;
 }
 
 declare var DOMRectReadOnly: {
     prototype: DOMRectReadOnly;
-    new (x?: number, y?: number, width?: number, height?: number): DOMRectReadOnly;
-    fromRect(rectangle?: DOMRectInit): DOMRectReadOnly;
+    new(x?: number, y?: number, width?: number, height?: number): DOMRectReadOnly;
+    fromRect(other?: DOMRectInit): DOMRectReadOnly;
 };
 
 interface DOMSettableTokenList extends DOMTokenList {
@@ -3279,8 +3827,18 @@ declare var DOMSettableTokenList: {
 };
 
 interface DOMStringList {
+    /**
+     * Returns the number of strings in strings.
+     */
     readonly length: number;
-    contains(str: string): boolean;
+    /**
+     * Returns true if strings contains string, and false
+     * otherwise.
+     */
+    contains(string: string): boolean;
+    /**
+     * Returns the string with index index from strings.
+     */
     item(index: number): string | null;
     [index: number]: string;
 }
@@ -3393,7 +3951,7 @@ interface DelayNode extends AudioNode {
 
 declare var DelayNode: {
     prototype: DelayNode;
-    new(): DelayNode;
+    new(context: BaseAudioContext, options?: DelayOptions): DelayNode;
 };
 
 interface DeviceAcceleration {
@@ -3579,22 +4137,27 @@ interface Document extends Node, GlobalEventHandlers, ParentNode, DocumentEvent
     /**
      * Sets or gets the color of all active links in the document.
      */
+    /** @deprecated */
     alinkColor: string;
     /**
      * Returns a reference to the collection of elements contained by the object.
      */
+    /** @deprecated */
     readonly all: HTMLAllCollection;
     /**
      * Retrieves a collection of all a objects that have a name and/or id property. Objects in this collection are in HTML source order.
      */
+    /** @deprecated */
     readonly anchors: HTMLCollectionOf<HTMLAnchorElement>;
     /**
      * Retrieves a collection of all applet objects in the document.
      */
+    /** @deprecated */
     readonly applets: HTMLCollectionOf<HTMLAppletElement>;
     /**
      * Deprecated. Sets or retrieves a value that indicates the background color behind the object.
      */
+    /** @deprecated */
     bgColor: string;
     /**
      * Specifies the beginning and end of the document body.
@@ -3639,6 +4202,7 @@ interface Document extends Node, GlobalEventHandlers, ParentNode, DocumentEvent
     /**
      * Sets or gets the foreground (text) color of the document.
      */
+    /** @deprecated */
     fgColor: string;
     /**
      * Retrieves a collection, in source order, of all form objects in the document.
@@ -3667,6 +4231,7 @@ interface Document extends Node, GlobalEventHandlers, ParentNode, DocumentEvent
     /**
      * Sets or gets the color of the document links.
      */
+    /** @deprecated */
     linkColor: string;
     /**
      * Retrieves a collection of all a objects that specify the href property and all area objects in the document.
@@ -3970,10 +4535,6 @@ interface Document extends Node, GlobalEventHandlers, ParentNode, DocumentEvent
      * @param ev The event.
      */
     ontimeupdate: ((this: Document, ev: Event) => any) | null;
-    ontouchcancel: ((this: Document, ev: TouchEvent) => any) | null;
-    ontouchend: ((this: Document, ev: TouchEvent) => any) | null;
-    ontouchmove: ((this: Document, ev: TouchEvent) => any) | null;
-    ontouchstart: ((this: Document, ev: TouchEvent) => any) | null;
     onvisibilitychange: (this: Document, ev: Event) => any;
     /**
      * Occurs when the volume is changed, or playback is muted or unmuted.
@@ -4010,6 +4571,7 @@ interface Document extends Node, GlobalEventHandlers, ParentNode, DocumentEvent
      * Retrieves a collection of styleSheet objects representing the style sheets that correspond to each instance of a link or style object in the document.
      */
     readonly styleSheets: StyleSheetList;
+    readonly timeline: DocumentTimeline;
     /**
      * Contains the title of the document.
      */
@@ -4018,6 +4580,7 @@ interface Document extends Node, GlobalEventHandlers, ParentNode, DocumentEvent
     /**
      * Sets or gets the color of the links that the user has visited.
      */
+    /** @deprecated */
     vlinkColor: string;
     readonly webkitCurrentFullScreenElement: Element | null;
     readonly webkitFullscreenElement: Element | null;
@@ -4030,8 +4593,10 @@ interface Document extends Node, GlobalEventHandlers, ParentNode, DocumentEvent
      */
     xmlVersion: string | null;
     adoptNode<T extends Node>(source: T): T;
+    /** @deprecated */
     captureEvents(): void;
     caretRangeFromPoint(x: number, y: number): Range;
+    /** @deprecated */
     clear(): void;
     /**
      * Closes an output stream and forces the sent data to display.
@@ -4180,6 +4745,7 @@ interface Document extends Node, GlobalEventHandlers, ParentNode, DocumentEvent
      */
     /** @deprecated */
     focus(): void;
+    getAnimations(): Animation[];
     /**
      * Returns a reference to the first object with the specified value of the ID or NAME attribute.
      * @param elementId String that specifies the ID value. Case-insensitive.
@@ -4250,6 +4816,7 @@ interface Document extends Node, GlobalEventHandlers, ParentNode, DocumentEvent
      * @param commandId String that specifies a command identifier.
      */
     queryCommandValue(commandId: string): string;
+    /** @deprecated */
     releaseEvents(): void;
     updateSettings(): void;
     webkitCancelFullScreen(): void;
@@ -4322,12 +4889,17 @@ interface DocumentEvent {
     createEvent(eventInterface: "ProgressEvent"): ProgressEvent;
     createEvent(eventInterface: "PromiseRejectionEvent"): PromiseRejectionEvent;
     createEvent(eventInterface: "RTCDTMFToneChangeEvent"): RTCDTMFToneChangeEvent;
+    createEvent(eventInterface: "RTCDataChannelEvent"): RTCDataChannelEvent;
     createEvent(eventInterface: "RTCDtlsTransportStateChangedEvent"): RTCDtlsTransportStateChangedEvent;
+    createEvent(eventInterface: "RTCErrorEvent"): RTCErrorEvent;
     createEvent(eventInterface: "RTCIceCandidatePairChangedEvent"): RTCIceCandidatePairChangedEvent;
     createEvent(eventInterface: "RTCIceGathererEvent"): RTCIceGathererEvent;
     createEvent(eventInterface: "RTCIceTransportStateChangedEvent"): RTCIceTransportStateChangedEvent;
+    createEvent(eventInterface: "RTCPeerConnectionIceErrorEvent"): RTCPeerConnectionIceErrorEvent;
     createEvent(eventInterface: "RTCPeerConnectionIceEvent"): RTCPeerConnectionIceEvent;
     createEvent(eventInterface: "RTCSsrcConflictEvent"): RTCSsrcConflictEvent;
+    createEvent(eventInterface: "RTCStatsEvent"): RTCStatsEvent;
+    createEvent(eventInterface: "RTCTrackEvent"): RTCTrackEvent;
     createEvent(eventInterface: "SVGZoomEvent"): SVGZoomEvent;
     createEvent(eventInterface: "SVGZoomEvents"): SVGZoomEvent;
     createEvent(eventInterface: "SecurityPolicyViolationEvent"): SecurityPolicyViolationEvent;
@@ -4364,6 +4936,14 @@ interface DocumentOrShadowRoot {
     getSelection(): Selection | null;
 }
 
+interface DocumentTimeline extends AnimationTimeline {
+}
+
+declare var DocumentTimeline: {
+    prototype: DocumentTimeline;
+    new(options?: DocumentTimelineOptions): DocumentTimeline;
+};
+
 interface DocumentType extends Node, ChildNode {
     readonly entities: NamedNodeMap;
     readonly internalSubset: string | null;
@@ -4400,7 +4980,7 @@ interface DynamicsCompressorNode extends AudioNode {
 
 declare var DynamicsCompressorNode: {
     prototype: DynamicsCompressorNode;
-    new(): DynamicsCompressorNode;
+    new(context: BaseAudioContext, options?: DynamicsCompressorOptions): DynamicsCompressorNode;
 };
 
 interface EXT_blend_minmax {
@@ -4463,7 +5043,7 @@ interface ElementEventMap extends GlobalEventHandlersEventMap {
     "webkitfullscreenerror": Event;
 }
 
-interface Element extends Node, GlobalEventHandlers, ElementTraversal, ParentNode, ChildNode {
+interface Element extends Node, GlobalEventHandlers, ElementTraversal, ParentNode, ChildNode, Animatable {
     readonly assignedSlot: HTMLSlotElement | null;
     readonly attributes: NamedNodeMap;
     readonly classList: DOMTokenList;
@@ -4478,8 +5058,6 @@ interface Element extends Node, GlobalEventHandlers, ElementTraversal, ParentNod
     readonly msRegionOverflow: string;
     onariarequest: ((this: Element, ev: Event) => any) | null;
     oncommand: ((this: Element, ev: Event) => any) | null;
-    ongotpointercapture: ((this: Element, ev: PointerEvent) => any) | null;
-    onlostpointercapture: ((this: Element, ev: PointerEvent) => any) | null;
     onmsgesturechange: ((this: Element, ev: Event) => any) | null;
     onmsgesturedoubletap: ((this: Element, ev: Event) => any) | null;
     onmsgestureend: ((this: Element, ev: Event) => any) | null;
@@ -4497,10 +5075,6 @@ interface Element extends Node, GlobalEventHandlers, ElementTraversal, ParentNod
     onmspointerout: ((this: Element, ev: Event) => any) | null;
     onmspointerover: ((this: Element, ev: Event) => any) | null;
     onmspointerup: ((this: Element, ev: Event) => any) | null;
-    ontouchcancel: ((this: Element, ev: TouchEvent) => any) | null;
-    ontouchend: ((this: Element, ev: TouchEvent) => any) | null;
-    ontouchmove: ((this: Element, ev: TouchEvent) => any) | null;
-    ontouchstart: ((this: Element, ev: TouchEvent) => any) | null;
     onwebkitfullscreenchange: ((this: Element, ev: Event) => any) | null;
     onwebkitfullscreenerror: ((this: Element, ev: Event) => any) | null;
     outerHTML: string;
@@ -4532,6 +5106,7 @@ interface Element extends Node, GlobalEventHandlers, ElementTraversal, ParentNod
     hasAttribute(name: string): boolean;
     hasAttributeNS(namespaceURI: string, localName: string): boolean;
     hasAttributes(): boolean;
+    hasPointerCapture(pointerId: number): boolean;
     insertAdjacentElement(position: InsertPosition, insertedElement: Element): Element | null;
     insertAdjacentHTML(where: InsertPosition, html: string): void;
     insertAdjacentText(where: InsertPosition, text: string): void;
@@ -4612,12 +5187,12 @@ interface Event {
     readonly bubbles: boolean;
     cancelBubble: boolean;
     readonly cancelable: boolean;
+    readonly composed: boolean;
     readonly currentTarget: EventTarget | null;
     readonly defaultPrevented: boolean;
     readonly eventPhase: number;
     readonly isTrusted: boolean;
     returnValue: boolean;
-    readonly scoped: boolean;
     readonly srcElement: Element | null;
     readonly target: EventTarget | null;
     readonly timeStamp: number;
@@ -4697,24 +5272,20 @@ declare var ExtensionScriptApis: {
 };
 
 interface External {
+    /** @deprecated */
+    AddSearchProvider(): void;
+    /** @deprecated */
+    IsSearchProviderInstalled(): void;
 }
 
-declare var External: {
-    prototype: External;
-    new(): External;
-};
-
 interface File extends Blob {
     readonly lastModified: number;
-    /** @deprecated */
-    readonly lastModifiedDate: Date;
     readonly name: string;
-    readonly webkitRelativePath: string;
 }
 
 declare var File: {
     prototype: File;
-    new (parts: (ArrayBuffer | ArrayBufferView | Blob | string)[], filename: string, properties?: FilePropertyBag): File;
+    new(fileBits: BlobPart[], fileName: string, options?: FilePropertyBag): File;
 };
 
 interface FileList {
@@ -4728,10 +5299,6 @@ declare var FileList: {
     new(): FileList;
 };
 
-interface FilePropertyBag extends BlobPropertyBag {
-    lastModified?: number;
-}
-
 interface FileReaderEventMap {
     "abort": ProgressEvent;
     "error": ProgressEvent;
@@ -4743,14 +5310,14 @@ interface FileReaderEventMap {
 
 interface FileReader extends EventTarget {
     readonly error: DOMException | null;
-    onabort: ((this: FileReader, ev: FileReaderProgressEvent) => any) | null;
-    onerror: ((this: FileReader, ev: FileReaderProgressEvent) => any) | null;
-    onload: ((this: FileReader, ev: FileReaderProgressEvent) => any) | null;
-    onloadend: ((this: FileReader, ev: FileReaderProgressEvent) => any) | null;
-    onloadstart: ((this: FileReader, ev: FileReaderProgressEvent) => any) | null;
-    onprogress: ((this: FileReader, ev: FileReaderProgressEvent) => any) | null;
+    onabort: ((this: FileReader, ev: ProgressEvent) => any) | null;
+    onerror: ((this: FileReader, ev: ProgressEvent) => any) | null;
+    onload: ((this: FileReader, ev: ProgressEvent) => any) | null;
+    onloadend: ((this: FileReader, ev: ProgressEvent) => any) | null;
+    onloadstart: ((this: FileReader, ev: ProgressEvent) => any) | null;
+    onprogress: ((this: FileReader, ev: ProgressEvent) => any) | null;
     readonly readyState: number;
-    readonly result: any;
+    readonly result: string | ArrayBuffer | null;
     abort(): void;
     readAsArrayBuffer(blob: Blob): void;
     readAsBinaryString(blob: Blob): void;
@@ -4773,10 +5340,6 @@ declare var FileReader: {
     readonly LOADING: number;
 };
 
-interface FileReaderProgressEvent extends ProgressEvent {
-    readonly target: FileReader | null;
-}
-
 interface FocusEvent extends UIEvent {
     readonly relatedTarget: EventTarget;
     initFocusEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number, relatedTargetArg: EventTarget): void;
@@ -4808,12 +5371,12 @@ interface FormData {
     getAll(name: string): FormDataEntryValue[];
     has(name: string): boolean;
     set(name: string, value: string | Blob, fileName?: string): void;
+    forEach(callbackfn: (value: FormDataEntryValue, key: string, parent: FormData) => void, thisArg?: any): void;
 }
 
 declare var FormData: {
     prototype: FormData;
-    new(): FormData;
-    new(form: HTMLFormElement): FormData;
+    new(form?: HTMLFormElement): FormData;
 };
 
 interface GainNode extends AudioNode {
@@ -4822,7 +5385,7 @@ interface GainNode extends AudioNode {
 
 declare var GainNode: {
     prototype: GainNode;
-    new(): GainNode;
+    new(context: BaseAudioContext, options?: GainOptions): GainNode;
 };
 
 interface Gamepad {
@@ -4896,16 +5459,17 @@ interface Geolocation {
     watchPosition(successCallback: PositionCallback, errorCallback?: PositionErrorCallback, options?: PositionOptions): number;
 }
 
-declare var Geolocation: {
-    prototype: Geolocation;
-    new(): Geolocation;
-};
-
 interface GetSVGDocument {
     getSVGDocument(): Document;
 }
 
 interface GlobalEventHandlersEventMap {
+    "animationcancel": AnimationEvent;
+    "animationend": AnimationEvent;
+    "animationiteration": AnimationEvent;
+    "animationstart": AnimationEvent;
+    "gotpointercapture": PointerEvent;
+    "lostpointercapture": PointerEvent;
     "pointercancel": PointerEvent;
     "pointerdown": PointerEvent;
     "pointerenter": PointerEvent;
@@ -4914,10 +5478,24 @@ interface GlobalEventHandlersEventMap {
     "pointerout": PointerEvent;
     "pointerover": PointerEvent;
     "pointerup": PointerEvent;
+    "touchcancel": TouchEvent;
+    "touchend": TouchEvent;
+    "touchmove": TouchEvent;
+    "touchstart": TouchEvent;
+    "transitioncancel": TransitionEvent;
+    "transitionend": TransitionEvent;
+    "transitionrun": TransitionEvent;
+    "transitionstart": TransitionEvent;
     "wheel": WheelEvent;
 }
 
 interface GlobalEventHandlers {
+    onanimationcancel: ((this: GlobalEventHandlers, ev: AnimationEvent) => any) | null;
+    onanimationend: ((this: GlobalEventHandlers, ev: AnimationEvent) => any) | null;
+    onanimationiteration: ((this: GlobalEventHandlers, ev: AnimationEvent) => any) | null;
+    onanimationstart: ((this: GlobalEventHandlers, ev: AnimationEvent) => any) | null;
+    ongotpointercapture: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
+    onlostpointercapture: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
     onpointercancel: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
     onpointerdown: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
     onpointerenter: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
@@ -4926,6 +5504,14 @@ interface GlobalEventHandlers {
     onpointerout: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
     onpointerover: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
     onpointerup: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
+    ontouchcancel: ((this: GlobalEventHandlers, ev: TouchEvent) => any) | null;
+    ontouchend: ((this: GlobalEventHandlers, ev: TouchEvent) => any) | null;
+    ontouchmove: ((this: GlobalEventHandlers, ev: TouchEvent) => any) | null;
+    ontouchstart: ((this: GlobalEventHandlers, ev: TouchEvent) => any) | null;
+    ontransitioncancel: ((this: GlobalEventHandlers, ev: TransitionEvent) => any) | null;
+    ontransitionend: ((this: GlobalEventHandlers, ev: TransitionEvent) => any) | null;
+    ontransitionrun: ((this: GlobalEventHandlers, ev: TransitionEvent) => any) | null;
+    ontransitionstart: ((this: GlobalEventHandlers, ev: TransitionEvent) => any) | null;
     onwheel: ((this: GlobalEventHandlers, ev: WheelEvent) => any) | null;
     addEventListener<K extends keyof GlobalEventHandlersEventMap>(type: K, listener: (this: GlobalEventHandlers, ev: GlobalEventHandlersEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
     addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
@@ -4938,8 +5524,17 @@ interface GlobalFetch {
 }
 
 interface HTMLAllCollection {
+    /**
+     * Returns the number of elements in the collection.
+     */
     readonly length: number;
+    /**
+     * element = collection(index)
+     */
     item(nameOrIndex?: string): HTMLCollection | Element | null;
+    /**
+     * element = collection(name)
+     */
     namedItem(name: string): HTMLCollection | Element | null;
     [index: number]: Element;
 }
@@ -4978,6 +5573,7 @@ interface HTMLAnchorElement extends HTMLElement, HTMLHyperlinkElementUtils {
      * Sets or retrieves the relationship between the object and the destination of the link.
      */
     rel: string;
+    readonly relList: DOMTokenList;
     /**
      * Sets or retrieves the relationship between the object and the destination of the link.
      */
@@ -5075,6 +5671,7 @@ interface HTMLAreaElement extends HTMLElement, HTMLHyperlinkElementUtils {
     /** @deprecated */
     noHref: boolean;
     rel: string;
+    readonly relList: DOMTokenList;
     /**
      * Sets or retrieves the shape of the object.
      */
@@ -5242,11 +5839,11 @@ interface HTMLButtonElement extends HTMLElement {
      * Overrides the target attribute on a form element.
      */
     formTarget: string;
+    readonly labels: NodeListOf<HTMLLabelElement>;
     /**
      * Sets or retrieves the name of the object.
      */
     name: string;
-    status: any;
     /**
      * Gets the classification and default behavior of the button.
      */
@@ -5271,6 +5868,7 @@ interface HTMLButtonElement extends HTMLElement {
      * Returns whether a form will validate when it is submitted, without having to submit it.
      */
     checkValidity(): boolean;
+    reportValidity(): boolean;
     /**
      * Sets a custom error message that is displayed when a form is submitted.
      * @param error Sets a custom error message that is displayed when a form is submitted.
@@ -5351,6 +5949,7 @@ declare var HTMLCollection: {
 interface HTMLCollectionOf<T extends Element> extends HTMLCollectionBase {
     item(index: number): T;
     namedItem(name: string): T;
+    forEach(callbackfn: (value: T, key: number, parent: HTMLCollectionOf<T>) => void, thisArg?: any): void;
     [index: number]: T;
 }
 
@@ -5425,6 +6024,7 @@ declare var HTMLDialogElement: {
 };
 
 interface HTMLDirectoryElement extends HTMLElement {
+    /** @deprecated */
     compact: boolean;
     addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDirectoryElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
     addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
@@ -5627,7 +6227,6 @@ interface HTMLElement extends Element, ElementCSSInlineStyle {
     spellcheck: boolean;
     tabIndex: number;
     title: string;
-    animate(keyframes: AnimationKeyFrame | AnimationKeyFrame[], options: number | AnimationOptions): Animation;
     blur(): void;
     click(): void;
     dragDrop(): boolean;
@@ -5645,6 +6244,8 @@ declare var HTMLElement: {
 };
 
 interface HTMLEmbedElement extends HTMLElement, GetSVGDocument {
+    /** @deprecated */
+    align: string;
     /**
      * Sets or retrieves the height of the object.
      */
@@ -5704,16 +6305,14 @@ declare var HTMLEmbedElement: {
 };
 
 interface HTMLFieldSetElement extends HTMLElement {
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    align: string;
     disabled: boolean;
+    readonly elements: HTMLCollection;
     /**
      * Retrieves a reference to the form that the object is embedded in.
      */
     readonly form: HTMLFormElement | null;
     name: string;
+    readonly type: string;
     /**
      * Returns the error message that would be displayed if the user submits the form, or an empty string if no error message. It also triggers the standard error message, such as "this is a required field". The result is that the user sees validation messages without actually submitting.
      */
@@ -5730,6 +6329,7 @@ interface HTMLFieldSetElement extends HTMLElement {
      * Returns whether a form will validate when it is submitted, without having to submit it.
      */
     checkValidity(): boolean;
+    reportValidity(): boolean;
     /**
      * Sets a custom error message that is displayed when a form is submitted.
      * @param error Sets a custom error message that is displayed when a form is submitted.
@@ -5746,12 +6346,16 @@ declare var HTMLFieldSetElement: {
     new(): HTMLFieldSetElement;
 };
 
-interface HTMLFontElement extends HTMLElement, DOML2DeprecatedColorProperty, DOML2DeprecatedSizeProperty {
+interface HTMLFontElement extends HTMLElement {
+    /** @deprecated */
+    color: string;
     /**
      * Sets or retrieves the current typeface family.
      */
     /** @deprecated */
     face: string;
+    /** @deprecated */
+    size: string;
     addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLFontElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
     addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
     removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLFontElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
@@ -5764,7 +6368,10 @@ declare var HTMLFontElement: {
 };
 
 interface HTMLFormControlsCollection extends HTMLCollectionBase {
-    namedItem(name: string): HTMLCollection | Element | null;
+    /**
+     * element = collection[name]
+     */
+    namedItem(name: string): RadioNodeList | Element | null;
 }
 
 declare var HTMLFormControlsCollection: {
@@ -5852,19 +6459,7 @@ declare var HTMLFormElement: {
     new(): HTMLFormElement;
 };
 
-interface HTMLFrameElementEventMap extends HTMLElementEventMap {
-    "load": Event;
-}
-
-interface HTMLFrameElement extends HTMLElement, GetSVGDocument {
-    /**
-     * Specifies the properties of a border drawn around an object.
-     */
-    border: string;
-    /**
-     * Sets or retrieves the border color of the object.
-     */
-    borderColor: any;
+interface HTMLFrameElement extends HTMLElement {
     /**
      * Retrieves the document object of the page or frame.
      */
@@ -5880,14 +6475,6 @@ interface HTMLFrameElement extends HTMLElement, GetSVGDocument {
      */
     /** @deprecated */
     frameBorder: string;
-    /**
-     * Sets or retrieves the amount of additional space between the frames.
-     */
-    frameSpacing: any;
-    /**
-     * Sets or retrieves the height of the object.
-     */
-    height: string | number;
     /**
      * Sets or retrieves a URI to a long description of the object.
      */
@@ -5923,13 +6510,9 @@ interface HTMLFrameElement extends HTMLElement, GetSVGDocument {
      */
     /** @deprecated */
     src: string;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    width: string | number;
-    addEventListener<K extends keyof HTMLFrameElementEventMap>(type: K, listener: (this: HTMLFrameElement, ev: HTMLFrameElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
+    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLFrameElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
     addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLFrameElementEventMap>(type: K, listener: (this: HTMLFrameElement, ev: HTMLFrameElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
+    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLFrameElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
     removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
 }
 
@@ -5938,33 +6521,22 @@ declare var HTMLFrameElement: {
     new(): HTMLFrameElement;
 };
 
-interface HTMLFrameSetElementEventMap extends HTMLElementEventMap, WindowEventHandlersEventMap {
-    "blur": FocusEvent;
-    "error": ErrorEvent;
-    "focus": FocusEvent;
-    "load": Event;
-    "orientationchange": Event;
-    "resize": UIEvent;
-    "scroll": UIEvent;
-}
-
 interface HTMLFrameSetElement extends HTMLElement, WindowEventHandlers {
     /**
      * Sets or retrieves the frame widths of the object.
      */
     /** @deprecated */
     cols: string;
-    name: string;
-    onorientationchange: ((this: HTMLFrameSetElement, ev: Event) => any) | null;
-    onresize: ((this: HTMLFrameSetElement, ev: UIEvent) => any) | null;
     /**
      * Sets or retrieves the frame heights of the object.
      */
     /** @deprecated */
     rows: string;
-    addEventListener<K extends keyof HTMLFrameSetElementEventMap>(type: K, listener: (this: HTMLFrameSetElement, ev: HTMLFrameSetElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
+    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLFrameSetElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
+    addEventListener<K extends keyof WindowEventHandlersEventMap>(type: K, listener: (this: HTMLFrameSetElement, ev: WindowEventHandlersEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
     addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLFrameSetElementEventMap>(type: K, listener: (this: HTMLFrameSetElement, ev: HTMLFrameSetElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
+    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLFrameSetElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
+    removeEventListener<K extends keyof WindowEventHandlersEventMap>(type: K, listener: (this: HTMLFrameSetElement, ev: WindowEventHandlersEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
     removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
 }
 
@@ -5973,17 +6545,21 @@ declare var HTMLFrameSetElement: {
     new(): HTMLFrameSetElement;
 };
 
-interface HTMLHRElement extends HTMLElement, DOML2DeprecatedColorProperty, DOML2DeprecatedSizeProperty {
+interface HTMLHRElement extends HTMLElement {
     /**
      * Sets or retrieves how the object is aligned with adjacent text.
      */
     /** @deprecated */
     align: string;
+    /** @deprecated */
+    color: string;
     /**
      * Sets or retrieves whether the horizontal rule is drawn with 3-D shading.
      */
     /** @deprecated */
     noShade: boolean;
+    /** @deprecated */
+    size: string;
     /**
      * Sets or retrieves the width of the object.
      */
@@ -6176,6 +6752,7 @@ interface HTMLImageElement extends HTMLElement {
     /**
      * Sets or retrieves a Uniform Resource Identifier (URI) to a long description of the object.
      */
+    /** @deprecated */
     longDesc: string;
     /** @deprecated */
     lowsrc: string;
@@ -6478,9 +7055,6 @@ declare var HTMLLabelElement: {
 };
 
 interface HTMLLegendElement extends HTMLElement {
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
     /** @deprecated */
     align: string;
     /**
@@ -6525,6 +7099,7 @@ interface HTMLLinkElement extends HTMLElement, LinkStyle {
      * Sets or retrieves the relationship between the object and the destination of the link.
      */
     rel: string;
+    readonly relList: DOMTokenList;
     /**
      * Sets or retrieves the relationship between the object and the destination of the link.
      */
@@ -6884,6 +7459,7 @@ declare var HTMLMetaElement: {
 
 interface HTMLMeterElement extends HTMLElement {
     high: number;
+    readonly labels: NodeListOf<HTMLLabelElement>;
     low: number;
     max: number;
     min: number;
@@ -7124,9 +7700,30 @@ declare var HTMLOptionElement: {
 };
 
 interface HTMLOptionsCollection extends HTMLCollectionOf<HTMLOptionElement> {
+    /**
+     * Returns the number of elements in the collection.
+     * When set to a smaller number, truncates the number of option elements in the corresponding container.
+     * When set to a greater number, adds new blank option elements to that container.
+     */
     length: number;
+    /**
+     * Returns the index of the first selected item, if any, or −1 if there is no selected
+     * item.
+     * Can be set, to change the selection.
+     */
     selectedIndex: number;
-    add(element: HTMLOptionElement | HTMLOptGroupElement, before?: HTMLElement | number | null): void;
+    /**
+     * Inserts element before the node given by before.
+     * The before argument can be a number, in which case element is inserted before the item with that number, or an element from the
+     * collection, in which case element is inserted before that element.
+     * If before is omitted, null, or a number out of range, then element will be added at the end of the list.
+     * This method will throw a "HierarchyRequestError" DOMException if
+     * element is an ancestor of the element into which it is to be inserted.
+     */
+    add(element: HTMLOptionElement | HTMLOptGroupElement, before?: HTMLElement | number): void;
+    /**
+     * Removes the item with index index from the collection.
+     */
     remove(index: number): void;
 }
 
@@ -7139,6 +7736,7 @@ interface HTMLOutputElement extends HTMLElement {
     defaultValue: string;
     readonly form: HTMLFormElement | null;
     readonly htmlFor: DOMTokenList;
+    readonly labels: NodeListOf<HTMLLabelElement>;
     name: string;
     readonly type: string;
     readonly validationMessage: string;
@@ -7237,10 +7835,7 @@ declare var HTMLPreElement: {
 };
 
 interface HTMLProgressElement extends HTMLElement {
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
+    readonly labels: NodeListOf<HTMLLabelElement>;
     /**
      * Defines the maximum, or "done" value for a progress element.
      */
@@ -7285,6 +7880,7 @@ interface HTMLScriptElement extends HTMLElement {
     /**
      * Sets or retrieves the character set used to encode the object.
      */
+    /** @deprecated */
     charset: string;
     crossOrigin: string | null;
     /**
@@ -7327,6 +7923,7 @@ declare var HTMLScriptElement: {
 };
 
 interface HTMLSelectElement extends HTMLElement {
+    autocomplete: string;
     /**
      * Provides a way to direct a user to a specific field when a document loads. This can provide both direction and convenience for a user, reducing the need to click or tab to a field when a page opens. This attribute is true when present on an element, and false when missing.
      */
@@ -7336,6 +7933,7 @@ interface HTMLSelectElement extends HTMLElement {
      * Retrieves a reference to the form that the object is embedded in.
      */
     readonly form: HTMLFormElement | null;
+    readonly labels: NodeListOf<HTMLLabelElement>;
     /**
      * Sets or retrieves the number of objects in a collection.
      */
@@ -7387,7 +7985,7 @@ interface HTMLSelectElement extends HTMLElement {
      * @param element Variant of type Number that specifies the index position in the collection where the element is placed. If no value is given, the method places the element at the end of the collection.
      * @param before Variant of type Object that specifies an element to insert before, or null to append the object to the collection.
      */
-    add(element: HTMLOptionElement | HTMLOptGroupElement, before?: HTMLElement | number | null): void;
+    add(element: HTMLOptionElement | HTMLOptGroupElement, before?: HTMLElement | number): void;
     /**
      * Returns whether a form will validate when it is submitted, without having to submit it.
      */
@@ -7397,17 +7995,19 @@ interface HTMLSelectElement extends HTMLElement {
      * @param name Variant of type Number or String that specifies the object or collection to retrieve. If this parameter is an integer, it is the zero-based index of the object. If this parameter is a string, all objects with matching name or id properties are retrieved, and a collection is returned if more than one match is made.
      * @param index Variant of type Number that specifies the zero-based index of the object to retrieve when a collection is returned.
      */
-    item(name?: any, index?: any): Element | null;
+    item(index: number): Element | null;
     /**
      * Retrieves a select object or an object from an options collection.
      * @param namedItem A String that specifies the name or id property of the object to retrieve. A collection is returned if more than one match is made.
      */
-    namedItem(name: string): any;
+    namedItem(name: string): HTMLOptionElement | null;
     /**
      * Removes an element from the collection.
      * @param index Number that specifies the zero-based index of the element to remove from the collection.
      */
-    remove(index?: number): void;
+    remove(): void;
+    remove(index: number): void;
+    reportValidity(): boolean;
     /**
      * Sets a custom error message that is displayed when a form is submitted.
      * @param error Sets a custom error message that is displayed when a form is submitted.
@@ -7417,7 +8017,7 @@ interface HTMLSelectElement extends HTMLElement {
     addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
     removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSelectElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
     removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-    [name: string]: any;
+    [index: number]: Element;
 }
 
 declare var HTMLSelectElement: {
@@ -7484,6 +8084,7 @@ interface HTMLStyleElement extends HTMLElement, LinkStyle {
     /**
      * Retrieves the CSS language in which the style sheet is written.
      */
+    /** @deprecated */
     type: string;
     addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLStyleElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
     addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
@@ -7861,6 +8462,7 @@ declare var HTMLTemplateElement: {
 };
 
 interface HTMLTextAreaElement extends HTMLElement {
+    autocomplete: string;
     /**
      * Provides a way to direct a user to a specific field when a document loads. This can provide both direction and convenience for a user, reducing the need to click or tab to a field when a page opens. This attribute is true when present on an element, and false when missing.
      */
@@ -7873,11 +8475,13 @@ interface HTMLTextAreaElement extends HTMLElement {
      * Sets or retrieves the initial contents of the object.
      */
     defaultValue: string;
+    dirName: string;
     disabled: boolean;
     /**
      * Retrieves a reference to the form that the object is embedded in.
      */
     readonly form: HTMLFormElement | null;
+    readonly labels: NodeListOf<HTMLLabelElement>;
     /**
      * Sets or retrieves the maximum number of characters that the user can enter in a text control.
      */
@@ -7903,6 +8507,7 @@ interface HTMLTextAreaElement extends HTMLElement {
      * Sets or retrieves the number of horizontal rows contained in the object.
      */
     rows: number;
+    selectionDirection: string;
     /**
      * Gets or sets the end position or offset of a text selection.
      */
@@ -7911,6 +8516,7 @@ interface HTMLTextAreaElement extends HTMLElement {
      * Gets or sets the starting position or offset of a text selection.
      */
     selectionStart: number;
+    readonly textLength: number;
     /**
      * Retrieves the type of control.
      */
@@ -7939,6 +8545,7 @@ interface HTMLTextAreaElement extends HTMLElement {
      * Returns whether a form will validate when it is submitted, without having to submit it.
      */
     checkValidity(): boolean;
+    reportValidity(): boolean;
     /**
      * Highlights the input area of a form element.
      */
@@ -7948,6 +8555,8 @@ interface HTMLTextAreaElement extends HTMLElement {
      * @param error Sets a custom error message that is displayed when a form is submitted.
      */
     setCustomValidity(error: string): void;
+    setRangeText(replacement: string): void;
+    setRangeText(replacement: string, start: number, end: number, selectionMode?: SelectionMode): void;
     /**
      * Sets the start and end positions of a selection in a text field.
      * @param start The offset into the text field for the start of the selection.
@@ -8107,15 +8716,6 @@ declare var HTMLVideoElement: {
     new(): HTMLVideoElement;
 };
 
-interface HTMLegendElement {
-    readonly form: HTMLFormElement | null;
-}
-
-declare var HTMLegendElement: {
-    prototype: HTMLegendElement;
-    new(): HTMLegendElement;
-};
-
 interface HashChangeEvent extends Event {
     readonly newURL: string;
     readonly oldURL: string;
@@ -8129,10 +8729,10 @@ declare var HashChangeEvent: {
 interface Headers {
     append(name: string, value: string): void;
     delete(name: string): void;
-    forEach(callback: Function, thisArg?: any): void;
     get(name: string): string | null;
     has(name: string): boolean;
     set(name: string, value: string): void;
+    forEach(callbackfn: (value: string, key: string, parent: Headers) => void, thisArg?: any): void;
 }
 
 declare var Headers: {
@@ -8162,34 +8762,66 @@ interface HkdfCtrParams extends Algorithm {
     label: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer;
 }
 
-interface IDBArrayKey extends Array<number | string | Date | IDBArrayKey> {
+interface IDBArrayKey extends Array<IDBValidKey> {
 }
 
 interface IDBCursor {
+    /**
+     * Returns the direction ("next", "nextunique", "prev" or "prevunique")
+     * of the cursor.
+     */
     readonly direction: IDBCursorDirection;
-    readonly key: IDBKeyRange | number | string | Date | IDBArrayKey;
-    readonly primaryKey: any;
+    /**
+     * Returns the key of the cursor.
+     * Throws a "InvalidStateError" DOMException if the cursor is advancing or is finished.
+     */
+    readonly key: IDBValidKey | IDBKeyRange;
+    /**
+     * Returns the effective key of the cursor.
+     * Throws a "InvalidStateError" DOMException if the cursor is advancing or is finished.
+     */
+    readonly primaryKey: IDBValidKey | IDBKeyRange;
+    /**
+     * Returns the IDBObjectStore or IDBIndex the cursor was opened from.
+     */
     readonly source: IDBObjectStore | IDBIndex;
+    /**
+     * Advances the cursor through the next count records in
+     * range.
+     */
     advance(count: number): void;
-    continue(key?: IDBKeyRange | number | string | Date | IDBArrayKey): void;
+    /**
+     * Advances the cursor to the next record in range matching or
+     * after key.
+     */
+    continue(key?: IDBValidKey | IDBKeyRange): void;
+    /**
+     * Advances the cursor to the next record in range matching
+     * or after key and primaryKey. Throws an "InvalidAccessError" DOMException if the source is not an index.
+     */
+    continuePrimaryKey(key: IDBValidKey | IDBKeyRange, primaryKey: IDBValidKey | IDBKeyRange): void;
+    /**
+     * Delete the record pointed at by the cursor with a new value.
+     * If successful, request's result will be undefined.
+     */
     delete(): IDBRequest;
+    /**
+     * Updated the record pointed at by the cursor with a new value.
+     * Throws a "DataError" DOMException if the effective object store uses in-line keys and the key would have changed.
+     * If successful, request's result will be the record's key.
+     */
     update(value: any): IDBRequest;
-    readonly NEXT: string;
-    readonly NEXT_NO_DUPLICATE: string;
-    readonly PREV: string;
-    readonly PREV_NO_DUPLICATE: string;
 }
 
 declare var IDBCursor: {
     prototype: IDBCursor;
     new(): IDBCursor;
-    readonly NEXT: string;
-    readonly NEXT_NO_DUPLICATE: string;
-    readonly PREV: string;
-    readonly PREV_NO_DUPLICATE: string;
 };
 
 interface IDBCursorWithValue extends IDBCursor {
+    /**
+     * Returns the cursor's current value.
+     */
     readonly value: any;
 }
 
@@ -8200,19 +8832,46 @@ declare var IDBCursorWithValue: {
 
 interface IDBDatabaseEventMap {
     "abort": Event;
+    "close": Event;
     "error": Event;
+    "versionchange": IDBVersionChangeEvent;
 }
 
 interface IDBDatabase extends EventTarget {
+    /**
+     * Returns the name of the database.
+     */
     readonly name: string;
+    /**
+     * Returns a list of the names of object stores in the database.
+     */
     readonly objectStoreNames: DOMStringList;
     onabort: ((this: IDBDatabase, ev: Event) => any) | null;
+    onclose: ((this: IDBDatabase, ev: Event) => any) | null;
     onerror: ((this: IDBDatabase, ev: Event) => any) | null;
-    onversionchange: ((this: IDBDatabase, ev: Event) => any) | null;
+    onversionchange: ((this: IDBDatabase, ev: IDBVersionChangeEvent) => any) | null;
+    /**
+     * Returns the version of the database.
+     */
     readonly version: number;
+    /**
+     * Closes the connection once all running transactions have finished.
+     */
     close(): void;
+    /**
+     * Creates a new object store with the given name and options and returns a new IDBObjectStore.
+     * Throws a "InvalidStateError" DOMException if not called within an upgrade transaction.
+     */
     createObjectStore(name: string, optionalParameters?: IDBObjectStoreParameters): IDBObjectStore;
+    /**
+     * Deletes the object store with the given name.
+     * Throws a "InvalidStateError" DOMException if not called within an upgrade transaction.
+     */
     deleteObjectStore(name: string): void;
+    /**
+     * Returns a new transaction with the given mode ("readonly" or "readwrite")
+     * and scope which can be a single object store name or an array of names.
+     */
     transaction(storeNames: string | string[], mode?: IDBTransactionMode): IDBTransaction;
     addEventListener<K extends keyof IDBDatabaseEventMap>(type: K, listener: (this: IDBDatabase, ev: IDBDatabaseEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
     addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
@@ -8230,8 +8889,26 @@ interface IDBEnvironment {
 }
 
 interface IDBFactory {
+    /**
+     * Compares two values as keys. Returns -1 if key1 precedes key2, 1 if key2 precedes key1, and 0 if
+     * the keys are equal.
+     * Throws a "DataError" DOMException if either input is not a valid key.
+     */
     cmp(first: any, second: any): number;
+    /**
+     * Attempts to delete the named database. If the
+     * database already exists and there are open connections that don't close in response to a versionchange event, the request will be blocked until all they close. If the request
+     * is successful request's result will be null.
+     */
     deleteDatabase(name: string): IDBOpenDBRequest;
+    /**
+     * Attempts to open a connection to the named database with the specified version. If the database already exists
+     * with a lower version and there are open connections that don't close in response to a versionchange event, the request will be blocked until all they close, then an upgrade
+     * will occur. If the database already exists with a higher
+     * version the request will fail. If the request is
+     * successful request's result will
+     * be the connection.
+     */
     open(name: string, version?: number): IDBOpenDBRequest;
 }
 
@@ -8242,15 +8919,57 @@ declare var IDBFactory: {
 
 interface IDBIndex {
     readonly keyPath: string | string[];
-    multiEntry: boolean;
-    readonly name: string;
+    readonly multiEntry: boolean;
+    /**
+     * Updates the name of the store to newName.
+     * Throws an "InvalidStateError" DOMException if not called within an upgrade
+     * transaction.
+     */
+    name: string;
+    /**
+     * Returns the IDBObjectStore the index belongs to.
+     */
     readonly objectStore: IDBObjectStore;
     readonly unique: boolean;
-    count(key?: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-    get(key: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-    getKey(key: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-    openCursor(range?: IDBKeyRange | number | string | Date | IDBArrayKey, direction?: IDBCursorDirection): IDBRequest;
-    openKeyCursor(range?: IDBKeyRange | number | string | Date | IDBArrayKey, direction?: IDBCursorDirection): IDBRequest;
+    /**
+     * Retrieves the number of records matching the given key or key range in query.
+     * If successful, request's result will be the
+     * count.
+     */
+    count(key?: IDBValidKey | IDBKeyRange): IDBRequest;
+    /**
+     * Retrieves the value of the first record matching the
+     * given key or key range in query.
+     * If successful, request's result will be the value, or undefined if there was no matching record.
+     */
+    get(key: IDBValidKey | IDBKeyRange): IDBRequest;
+    /**
+     * Retrieves the values of the records matching the given key or key range in query (up to count if given).
+     * If successful, request's result will be an Array of the values.
+     */
+    getAll(query?: IDBValidKey | IDBKeyRange, count?: number): IDBRequest;
+    /**
+     * Retrieves the keys of records matching the given key or key range in query (up to count if given).
+     * If successful, request's result will be an Array of the keys.
+     */
+    getAllKeys(query?: IDBValidKey | IDBKeyRange, count?: number): IDBRequest;
+    /**
+     * Retrieves the key of the first record matching the
+     * given key or key range in query.
+     * If successful, request's result will be the key, or undefined if there was no matching record.
+     */
+    getKey(key: IDBValidKey | IDBKeyRange): IDBRequest;
+    /**
+     * Opens a cursor over the records matching query,
+     * ordered by direction. If query is null, all records in index are matched.
+     * If successful, request's result will be an IDBCursorWithValue, or null if there were no matching records.
+     */
+    openCursor(range?: IDBValidKey | IDBKeyRange, direction?: IDBCursorDirection): IDBRequest;
+    /**
+     * Opens a cursor with key only flag set over the records matching query, ordered by direction. If query is null, all records in index are matched.
+     * If successful, request's result will be an IDBCursor, or null if there were no matching records.
+     */
+    openKeyCursor(range?: IDBValidKey | IDBKeyRange, direction?: IDBCursorDirection): IDBRequest;
 }
 
 declare var IDBIndex: {
@@ -8259,37 +8978,150 @@ declare var IDBIndex: {
 };
 
 interface IDBKeyRange {
+    /**
+     * Returns lower bound, or undefined if none.
+     */
     readonly lower: any;
+    /**
+     * Returns true if the lower open flag is set, and false otherwise.
+     */
     readonly lowerOpen: boolean;
+    /**
+     * Returns upper bound, or undefined if none.
+     */
     readonly upper: any;
+    /**
+     * Returns true if the upper open flag is set, and false otherwise.
+     */
     readonly upperOpen: boolean;
+    /**
+     * Returns true if key is included in the range, and false otherwise.
+     */
+    includes(key: any): boolean;
 }
 
 declare var IDBKeyRange: {
     prototype: IDBKeyRange;
     new(): IDBKeyRange;
+    /**
+     * Returns a new IDBKeyRange spanning from lower to upper.
+     * If lowerOpen is true, lower is not included in the range.
+     * If upperOpen is true, upper is not included in the range.
+     */
     bound(lower: any, upper: any, lowerOpen?: boolean, upperOpen?: boolean): IDBKeyRange;
+    /**
+     * Returns a new IDBKeyRange starting at key with no
+     * upper bound. If open is true, key is not included in the
+     * range.
+     */
     lowerBound(lower: any, open?: boolean): IDBKeyRange;
+    /**
+     * Returns a new IDBKeyRange spanning only key.
+     */
     only(value: any): IDBKeyRange;
+    /**
+     * Returns a new IDBKeyRange with no lower bound and ending at key. If open is true, key is not included in the range.
+     */
     upperBound(upper: any, open?: boolean): IDBKeyRange;
 };
 
 interface IDBObjectStore {
-    autoIncrement: boolean;
+    /**
+     * Returns true if the store has a key generator, and false otherwise.
+     */
+    readonly autoIncrement: boolean;
+    /**
+     * Returns a list of the names of indexes in the store.
+     */
     readonly indexNames: DOMStringList;
-    readonly keyPath: string | string[] | null;
-    readonly name: string;
+    /**
+     * Returns the key path of the store, or null if none.
+     */
+    readonly keyPath: string | string[];
+    /**
+     * Updates the name of the store to newName.
+     * Throws "InvalidStateError" DOMException if not called within an upgrade
+     * transaction.
+     */
+    name: string;
+    /**
+     * Returns the associated transaction.
+     */
     readonly transaction: IDBTransaction;
-    add(value: any, key?: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
+    add(value: any, key?: IDBValidKey | IDBKeyRange): IDBRequest;
+    /**
+     * Deletes all records in store.
+     * If successful, request's result will
+     * be undefined.
+     */
     clear(): IDBRequest;
-    count(key?: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-    createIndex(name: string, keyPath: string | string[], optionalParameters?: IDBIndexParameters): IDBIndex;
-    delete(key: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-    deleteIndex(indexName: string): void;
-    get(key: any): IDBRequest;
+    /**
+     * Retrieves the number of records matching the
+     * given key or key range in query.
+     * If successful, request's result will be the count.
+     */
+    count(key?: IDBValidKey | IDBKeyRange): IDBRequest;
+    /**
+     * Creates a new index in store with the given name, keyPath and options and returns a new IDBIndex. If the keyPath and options define constraints that cannot be
+     * satisfied with the data already in store the upgrade
+     * transaction will abort with
+     * a "ConstraintError" DOMException.
+     * Throws an "InvalidStateError" DOMException if not called within an upgrade
+     * transaction.
+     */
+    createIndex(name: string, keyPath: string | string[], options?: IDBIndexParameters): IDBIndex;
+    /**
+     * Deletes records in store with the given key or in the given key range in query.
+     * If successful, request's result will
+     * be undefined.
+     */
+    delete(key: IDBValidKey | IDBKeyRange): IDBRequest;
+    /**
+     * Deletes the index in store with the given name.
+     * Throws an "InvalidStateError" DOMException if not called within an upgrade
+     * transaction.
+     */
+    deleteIndex(name: string): void;
+    /**
+     * Retrieves the value of the first record matching the
+     * given key or key range in query.
+     * If successful, request's result will be the value, or undefined if there was no matching record.
+     */
+    get(query: IDBValidKey | IDBKeyRange): IDBRequest;
+    /**
+     * Retrieves the values of the records matching the
+     * given key or key range in query (up to count if given).
+     * If successful, request's result will
+     * be an Array of the values.
+     */
+    getAll(query?: IDBValidKey | IDBKeyRange, count?: number): IDBRequest;
+    /**
+     * Retrieves the keys of records matching the
+     * given key or key range in query (up to count if given).
+     * If successful, request's result will
+     * be an Array of the keys.
+     */
+    getAllKeys(query?: IDBValidKey | IDBKeyRange, count?: number): IDBRequest;
+    /**
+     * Retrieves the key of the first record matching the
+     * given key or key range in query.
+     * If successful, request's result will be the key, or undefined if there was no matching record.
+     */
+    getKey(query: IDBValidKey | IDBKeyRange): IDBRequest;
     index(name: string): IDBIndex;
-    openCursor(range?: IDBKeyRange | number | string | Date | IDBArrayKey, direction?: IDBCursorDirection): IDBRequest;
-    put(value: any, key?: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
+    /**
+     * Opens a cursor over the records matching query,
+     * ordered by direction. If query is null, all records in store are matched.
+     * If successful, request's result will be an IDBCursorWithValue pointing at the first matching record, or null if there were no matching records.
+     */
+    openCursor(range?: IDBValidKey | IDBKeyRange, direction?: IDBCursorDirection): IDBRequest;
+    /**
+     * Opens a cursor with key only flag set over the records matching query, ordered by direction. If query is null, all records in store are matched.
+     * If successful, request's result will be an IDBCursor pointing at the first matching record, or
+     * null if there were no matching records.
+     */
+    openKeyCursor(query?: IDBValidKey | IDBKeyRange, direction?: IDBCursorDirection): IDBRequest;
+    put(value: any, key?: IDBValidKey | IDBKeyRange): IDBRequest;
 }
 
 declare var IDBObjectStore: {
@@ -8322,13 +9154,34 @@ interface IDBRequestEventMap {
 }
 
 interface IDBRequest extends EventTarget {
-    readonly error: DOMException;
+    /**
+     * When a request is completed, returns the error (a DOMException), or null if the request succeeded. Throws
+     * a "InvalidStateError" DOMException if the request is still pending.
+     */
+    readonly error: DOMException | null;
     onerror: ((this: IDBRequest, ev: Event) => any) | null;
     onsuccess: ((this: IDBRequest, ev: Event) => any) | null;
+    /**
+     * Returns "pending" until a request is complete,
+     * then returns "done".
+     */
     readonly readyState: IDBRequestReadyState;
+    /**
+     * When a request is completed, returns the result,
+     * or undefined if the request failed. Throws a
+     * "InvalidStateError" DOMException if the request is still pending.
+     */
     readonly result: any;
+    /**
+     * Returns the IDBObjectStore, IDBIndex, or IDBCursor the request was made against, or null if is was an open
+     * request.
+     */
     readonly source: IDBObjectStore | IDBIndex | IDBCursor;
-    readonly transaction: IDBTransaction;
+    /**
+     * Returns the IDBTransaction the request was made within.
+     * If this as an open request, then it returns an upgrade transaction while it is running, or null otherwise.
+     */
+    readonly transaction: IDBTransaction | null;
     addEventListener<K extends keyof IDBRequestEventMap>(type: K, listener: (this: IDBRequest, ev: IDBRequestEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
     addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
     removeEventListener<K extends keyof IDBRequestEventMap>(type: K, listener: (this: IDBRequest, ev: IDBRequestEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
@@ -8347,17 +9200,39 @@ interface IDBTransactionEventMap {
 }
 
 interface IDBTransaction extends EventTarget {
+    /**
+     * Returns the transaction's connection.
+     */
     readonly db: IDBDatabase;
+    /**
+     * If the transaction was aborted, returns the
+     * error (a DOMException) providing the reason.
+     */
     readonly error: DOMException;
+    /**
+     * Returns the mode the transaction was created with
+     * ("readonly" or "readwrite"), or "versionchange" for
+     * an upgrade transaction.
+     */
     readonly mode: IDBTransactionMode;
+    /**
+     * Returns a list of the names of object stores in the
+     * transaction's scope. For an upgrade transaction this is all object stores in the database.
+     */
+    readonly objectStoreNames: DOMStringList;
     onabort: ((this: IDBTransaction, ev: Event) => any) | null;
     oncomplete: ((this: IDBTransaction, ev: Event) => any) | null;
     onerror: ((this: IDBTransaction, ev: Event) => any) | null;
+    /**
+     * Aborts the transaction. All pending requests will fail with
+     * a "AbortError" DOMException and all changes made to the database will be
+     * reverted.
+     */
     abort(): void;
+    /**
+     * Returns an IDBObjectStore in the transaction's scope.
+     */
     objectStore(name: string): IDBObjectStore;
-    readonly READ_ONLY: string;
-    readonly READ_WRITE: string;
-    readonly VERSION_CHANGE: string;
     addEventListener<K extends keyof IDBTransactionEventMap>(type: K, listener: (this: IDBTransaction, ev: IDBTransactionEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
     addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
     removeEventListener<K extends keyof IDBTransactionEventMap>(type: K, listener: (this: IDBTransaction, ev: IDBTransactionEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
@@ -8367,9 +9242,6 @@ interface IDBTransaction extends EventTarget {
 declare var IDBTransaction: {
     prototype: IDBTransaction;
     new(): IDBTransaction;
-    readonly READ_ONLY: string;
-    readonly READ_WRITE: string;
-    readonly VERSION_CHANGE: string;
 };
 
 interface IDBVersionChangeEvent extends Event {
@@ -8379,7 +9251,7 @@ interface IDBVersionChangeEvent extends Event {
 
 declare var IDBVersionChangeEvent: {
     prototype: IDBVersionChangeEvent;
-    new(): IDBVersionChangeEvent;
+    new(type: string, eventInitDict?: IDBVersionChangeEventInit): IDBVersionChangeEvent;
 };
 
 interface IIRFilterNode extends AudioNode {
@@ -8388,7 +9260,7 @@ interface IIRFilterNode extends AudioNode {
 
 declare var IIRFilterNode: {
     prototype: IIRFilterNode;
-    new(): IIRFilterNode;
+    new(context: BaseAudioContext, options: IIRFilterOptions): IIRFilterNode;
 };
 
 interface ImageBitmap {
@@ -8487,6 +9359,20 @@ declare var KeyboardEvent: {
     readonly DOM_KEY_LOCATION_STANDARD: number;
 };
 
+interface KeyframeEffect extends AnimationEffect {
+    composite: CompositeOperation;
+    iterationComposite: IterationCompositeOperation;
+    target: Element | null;
+    getKeyframes(): ComputedKeyframe[];
+    setKeyframes(keyframes: Keyframe[] | PropertyIndexedKeyframes | null): void;
+}
+
+declare var KeyframeEffect: {
+    prototype: KeyframeEffect;
+    new(target: Element | null, keyframes: Keyframe[] | PropertyIndexedKeyframes | null, options?: number | KeyframeEffectOptions): KeyframeEffect;
+    new(source: KeyframeEffect): KeyframeEffect;
+};
+
 interface LinkStyle {
     readonly sheet: StyleSheet | null;
 }
@@ -8803,48 +9689,6 @@ declare var MSStream: {
     new(): MSStream;
 };
 
-interface MSStreamReaderEventMap {
-    "abort": UIEvent;
-    "error": ErrorEvent;
-    "load": Event;
-    "loadend": ProgressEvent;
-    "loadstart": Event;
-    "progress": ProgressEvent;
-}
-
-interface MSStreamReader extends EventTarget {
-    readonly error: DOMError;
-    onabort: ((this: MSStreamReader, ev: UIEvent) => any) | null;
-    onerror: ((this: MSStreamReader, ev: ErrorEvent) => any) | null;
-    onload: ((this: MSStreamReader, ev: Event) => any) | null;
-    onloadend: ((this: MSStreamReader, ev: ProgressEvent) => any) | null;
-    onloadstart: ((this: MSStreamReader, ev: Event) => any) | null;
-    onprogress: ((this: MSStreamReader, ev: ProgressEvent) => any) | null;
-    readonly readyState: number;
-    readonly result: any;
-    abort(): void;
-    readAsArrayBuffer(stream: MSStream, size?: number): void;
-    readAsBinaryString(stream: MSStream, size?: number): void;
-    readAsBlob(stream: MSStream, size?: number): void;
-    readAsDataURL(stream: MSStream, size?: number): void;
-    readAsText(stream: MSStream, encoding?: string, size?: number): void;
-    readonly DONE: number;
-    readonly EMPTY: number;
-    readonly LOADING: number;
-    addEventListener<K extends keyof MSStreamReaderEventMap>(type: K, listener: (this: MSStreamReader, ev: MSStreamReaderEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof MSStreamReaderEventMap>(type: K, listener: (this: MSStreamReader, ev: MSStreamReaderEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var MSStreamReader: {
-    prototype: MSStreamReader;
-    new(): MSStreamReader;
-    readonly DONE: number;
-    readonly EMPTY: number;
-    readonly LOADING: number;
-};
-
 interface MediaDeviceInfo {
     readonly deviceId: string;
     readonly groupId: string;
@@ -8878,11 +9722,12 @@ declare var MediaDevices: {
 };
 
 interface MediaElementAudioSourceNode extends AudioNode {
+    readonly mediaElement: HTMLMediaElement;
 }
 
 declare var MediaElementAudioSourceNode: {
     prototype: MediaElementAudioSourceNode;
-    new(): MediaElementAudioSourceNode;
+    new(context: AudioContext, options: MediaElementAudioSourceOptions): MediaElementAudioSourceNode;
 };
 
 interface MediaEncryptedEvent extends Event {
@@ -9006,10 +9851,10 @@ declare var MediaQueryList: {
 interface MediaSource extends EventTarget {
     readonly activeSourceBuffers: SourceBufferList;
     duration: number;
-    readonly readyState: string;
+    readonly readyState: ReadyState;
     readonly sourceBuffers: SourceBufferList;
     addSourceBuffer(type: string): SourceBuffer;
-    endOfStream(error?: number): void;
+    endOfStream(error?: EndOfStreamError): void;
     removeSourceBuffer(sourceBuffer: SourceBuffer): void;
 }
 
@@ -9054,12 +9899,22 @@ declare var MediaStream: {
     new(tracks: MediaStreamTrack[]): MediaStream;
 };
 
+interface MediaStreamAudioDestinationNode extends AudioNode {
+    readonly stream: MediaStream;
+}
+
+declare var MediaStreamAudioDestinationNode: {
+    prototype: MediaStreamAudioDestinationNode;
+    new(context: AudioContext, options?: AudioNodeOptions): MediaStreamAudioDestinationNode;
+};
+
 interface MediaStreamAudioSourceNode extends AudioNode {
+    readonly mediaStream: MediaStream;
 }
 
 declare var MediaStreamAudioSourceNode: {
     prototype: MediaStreamAudioSourceNode;
-    new(): MediaStreamAudioSourceNode;
+    new(context: AudioContext, options: MediaStreamAudioSourceOptions): MediaStreamAudioSourceNode;
 };
 
 interface MediaStreamError {
@@ -9093,6 +9948,7 @@ declare var MediaStreamEvent: {
 
 interface MediaStreamTrackEventMap {
     "ended": MediaStreamErrorEvent;
+    "isolationchange": Event;
     "mute": Event;
     "overconstrained": MediaStreamErrorEvent;
     "unmute": Event;
@@ -9101,10 +9957,12 @@ interface MediaStreamTrackEventMap {
 interface MediaStreamTrack extends EventTarget {
     enabled: boolean;
     readonly id: string;
+    readonly isolated: boolean;
     readonly kind: string;
     readonly label: string;
     readonly muted: boolean;
     onended: ((this: MediaStreamTrack, ev: MediaStreamErrorEvent) => any) | null;
+    onisolationchange: ((this: MediaStreamTrack, ev: Event) => any) | null;
     onmute: ((this: MediaStreamTrack, ev: Event) => any) | null;
     onoverconstrained: ((this: MediaStreamTrack, ev: MediaStreamErrorEvent) => any) | null;
     onunmute: ((this: MediaStreamTrack, ev: Event) => any) | null;
@@ -9128,6 +9986,14 @@ declare var MediaStreamTrack: {
     new(): MediaStreamTrack;
 };
 
+interface MediaStreamTrackAudioSourceNode extends AudioNode {
+}
+
+declare var MediaStreamTrackAudioSourceNode: {
+    prototype: MediaStreamTrackAudioSourceNode;
+    new(context: AudioContext, options: MediaStreamTrackAudioSourceOptions): MediaStreamTrackAudioSourceNode;
+};
+
 interface MediaStreamTrackEvent extends Event {
     readonly track: MediaStreamTrack;
 }
@@ -9151,7 +10017,7 @@ interface MessageEvent extends Event {
     readonly data: any;
     readonly origin: string;
     readonly ports: ReadonlyArray<MessagePort>;
-    readonly source: Window | null;
+    readonly source: MessageEventSource;
     initMessageEvent(type: string, bubbles: boolean, cancelable: boolean, data: any, origin: string, lastEventId: string, source: Window): void;
 }
 
@@ -9162,12 +10028,27 @@ declare var MessageEvent: {
 
 interface MessagePortEventMap {
     "message": MessageEvent;
+    "messageerror": MessageEvent;
 }
 
 interface MessagePort extends EventTarget {
     onmessage: ((this: MessagePort, ev: MessageEvent) => any) | null;
+    onmessageerror: ((this: MessagePort, ev: MessageEvent) => any) | null;
+    /**
+     * Disconnects the port, so that it is no longer active.
+     */
     close(): void;
-    postMessage(message?: any, transfer?: any[]): void;
+    /**
+     * Posts a message through the channel. Objects listed in transfer are
+     * transferred, not just cloned, meaning that they are no longer usable on the sending side.
+     * Throws a "DataCloneError" DOMException if
+     * transfer contains duplicate objects or port, or if message
+     * could not be cloned.
+     */
+    postMessage(message: any, transfer?: any[]): void;
+    /**
+     * Begins dispatching messages received on the port.
+     */
     start(): void;
     addEventListener<K extends keyof MessagePortEventMap>(type: K, listener: (this: MessagePort, ev: MessagePortEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
     addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
@@ -9306,7 +10187,19 @@ declare var NamedNodeMap: {
     new(): NamedNodeMap;
 };
 
-interface Navigator extends NavigatorID, NavigatorOnLine, NavigatorContentUtils, NavigatorStorageUtils, MSNavigatorDoNotTrack, MSFileSaver, NavigatorBeacon, NavigatorConcurrentHardware, NavigatorUserMedia, NavigatorLanguage {
+interface NavigationPreloadManager {
+    disable(): Promise<void>;
+    enable(): Promise<void>;
+    getState(): Promise<NavigationPreloadState>;
+    setHeaderValue(value: string): Promise<void>;
+}
+
+declare var NavigationPreloadManager: {
+    prototype: NavigationPreloadManager;
+    new(): NavigationPreloadManager;
+};
+
+interface Navigator extends NavigatorID, NavigatorOnLine, NavigatorContentUtils, NavigatorStorageUtils, MSNavigatorDoNotTrack, MSFileSaver, NavigatorBeacon, NavigatorConcurrentHardware, NavigatorUserMedia, NavigatorLanguage, NavigatorStorage {
     readonly activeVRDisplays: ReadonlyArray<VRDisplay>;
     readonly authentication: WebAuthentication;
     readonly cookieEnabled: boolean;
@@ -9367,6 +10260,10 @@ interface NavigatorOnLine {
     readonly onLine: boolean;
 }
 
+interface NavigatorStorage {
+    readonly storage: StorageManager;
+}
+
 interface NavigatorStorageUtils {
 }
 
@@ -9492,6 +10389,12 @@ declare var NodeIterator: {
 interface NodeList {
     readonly length: number;
     item(index: number): Node;
+    /**
+     * Performs the specified action for each node in an list.
+     * @param callbackfn  A function that accepts up to three arguments. forEach calls the callbackfn function one time for each element in the list.
+     * @param thisArg  An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
+     */
+    forEach(callbackfn: (value: Node, key: number, parent: NodeList) => void, thisArg?: any): void;
     [index: number]: Node;
 }
 
@@ -9503,6 +10406,12 @@ declare var NodeList: {
 interface NodeListOf<TNode extends Node> extends NodeList {
     length: number;
     item(index: number): TNode;
+    /**
+     * Performs the specified action for each node in an list.
+     * @param callbackfn  A function that accepts up to three arguments. forEach calls the callbackfn function one time for each element in the list.
+     * @param thisArg  An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
+     */
+    forEach(callbackfn: (value: TNode, key: number, parent: NodeListOf<TNode>) => void, thisArg?: any): void;
     [index: number]: TNode;
 }
 
@@ -9523,18 +10432,25 @@ interface NotificationEventMap {
 }
 
 interface Notification extends EventTarget {
-    readonly body: string | null;
+    readonly actions: ReadonlyArray<NotificationAction>;
+    readonly badge: string;
+    readonly body: string;
     readonly data: any;
     readonly dir: NotificationDirection;
-    readonly icon: string | null;
-    readonly lang: string | null;
+    readonly icon: string;
+    readonly image: string;
+    readonly lang: string;
     onclick: ((this: Notification, ev: Event) => any) | null;
     onclose: ((this: Notification, ev: Event) => any) | null;
     onerror: ((this: Notification, ev: Event) => any) | null;
     onshow: ((this: Notification, ev: Event) => any) | null;
-    readonly permission: NotificationPermission;
-    readonly tag: string | null;
+    readonly renotify: boolean;
+    readonly requireInteraction: boolean;
+    readonly silent: boolean;
+    readonly tag: string;
+    readonly timestamp: number;
     readonly title: string;
+    readonly vibrate: ReadonlyArray<number>;
     close(): void;
     addEventListener<K extends keyof NotificationEventMap>(type: K, listener: (this: Notification, ev: NotificationEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
     addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
@@ -9545,7 +10461,9 @@ interface Notification extends EventTarget {
 declare var Notification: {
     prototype: Notification;
     new(title: string, options?: NotificationOptions): Notification;
-    requestPermission(callback?: NotificationPermissionCallback): Promise<NotificationPermission>;
+    readonly maxActions: number;
+    readonly permission: NotificationPermission;
+    requestPermission(deprecatedCallback?: NotificationPermissionCallback): Promise<NotificationPermission>;
 };
 
 interface OES_element_index_uint {
@@ -9614,14 +10532,14 @@ interface OfflineAudioCompletionEvent extends Event {
 
 declare var OfflineAudioCompletionEvent: {
     prototype: OfflineAudioCompletionEvent;
-    new(): OfflineAudioCompletionEvent;
+    new(type: string, eventInitDict: OfflineAudioCompletionEventInit): OfflineAudioCompletionEvent;
 };
 
-interface OfflineAudioContextEventMap extends AudioContextEventMap {
+interface OfflineAudioContextEventMap extends BaseAudioContextEventMap {
     "complete": OfflineAudioCompletionEvent;
 }
 
-interface OfflineAudioContext extends AudioContextBase {
+interface OfflineAudioContext extends BaseAudioContext {
     readonly length: number;
     oncomplete: ((this: OfflineAudioContext, ev: OfflineAudioCompletionEvent) => any) | null;
     startRendering(): Promise<AudioBuffer>;
@@ -9634,30 +10552,24 @@ interface OfflineAudioContext extends AudioContextBase {
 
 declare var OfflineAudioContext: {
     prototype: OfflineAudioContext;
+    new(contextOptions: OfflineAudioContextOptions): OfflineAudioContext;
     new(numberOfChannels: number, length: number, sampleRate: number): OfflineAudioContext;
 };
 
-interface OscillatorNodeEventMap {
-    "ended": Event;
-}
-
-interface OscillatorNode extends AudioNode {
+interface OscillatorNode extends AudioScheduledSourceNode {
     readonly detune: AudioParam;
     readonly frequency: AudioParam;
-    onended: ((this: OscillatorNode, ev: Event) => any) | null;
     type: OscillatorType;
     setPeriodicWave(periodicWave: PeriodicWave): void;
-    start(when?: number): void;
-    stop(when?: number): void;
-    addEventListener<K extends keyof OscillatorNodeEventMap>(type: K, listener: (this: OscillatorNode, ev: OscillatorNodeEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
+    addEventListener<K extends keyof AudioScheduledSourceNodeEventMap>(type: K, listener: (this: OscillatorNode, ev: AudioScheduledSourceNodeEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
     addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof OscillatorNodeEventMap>(type: K, listener: (this: OscillatorNode, ev: OscillatorNodeEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
+    removeEventListener<K extends keyof AudioScheduledSourceNodeEventMap>(type: K, listener: (this: OscillatorNode, ev: AudioScheduledSourceNodeEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
     removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
 }
 
 declare var OscillatorNode: {
     prototype: OscillatorNode;
-    new(): OscillatorNode;
+    new(context: BaseAudioContext, options?: OscillatorOptions): OscillatorNode;
 };
 
 interface OverflowEvent extends UIEvent {
@@ -9692,30 +10604,31 @@ interface PannerNode extends AudioNode {
     coneOuterGain: number;
     distanceModel: DistanceModelType;
     maxDistance: number;
+    readonly orientationX: AudioParam;
+    readonly orientationY: AudioParam;
+    readonly orientationZ: AudioParam;
     panningModel: PanningModelType;
+    readonly positionX: AudioParam;
+    readonly positionY: AudioParam;
+    readonly positionZ: AudioParam;
     refDistance: number;
     rolloffFactor: number;
     /** @deprecated */
     setOrientation(x: number, y: number, z: number): void;
     /** @deprecated */
     setPosition(x: number, y: number, z: number): void;
-    /** @deprecated */
-    setVelocity(x: number, y: number, z: number): void;
 }
 
 declare var PannerNode: {
     prototype: PannerNode;
-    new(): PannerNode;
+    new(context: BaseAudioContext, options?: PannerOptions): PannerNode;
 };
 
 interface ParentNode {
     readonly childElementCount: number;
+    readonly children: HTMLCollection;
     readonly firstElementChild: Element | null;
     readonly lastElementChild: Element | null;
-}
-
-interface ParentNode {
-    readonly children: HTMLCollection;
     querySelector<K extends keyof HTMLElementTagNameMap>(selectors: K): HTMLElementTagNameMap[K] | null;
     querySelector<K extends keyof SVGElementTagNameMap>(selectors: K): SVGElementTagNameMap[K] | null;
     querySelector<E extends Element = Element>(selectors: string): E | null;
@@ -9834,27 +10747,32 @@ declare var PerfWidgetExternal: {
     new(): PerfWidgetExternal;
 };
 
-interface Performance {
+interface PerformanceEventMap {
+    "resourcetimingbufferfull": Event;
+}
+
+interface Performance extends EventTarget {
     /** @deprecated */
     readonly navigation: PerformanceNavigation;
+    onresourcetimingbufferfull: ((this: Performance, ev: Event) => any) | null;
     readonly timeOrigin: number;
     /** @deprecated */
     readonly timing: PerformanceTiming;
     clearMarks(markName?: string): void;
     clearMeasures(measureName?: string): void;
     clearResourceTimings(): void;
-    getEntries(): any;
-    getEntriesByName(name: string, type?: string): any;
-    getEntriesByType(type: string): any;
-    /** @deprecated */
-    getMarks(markName?: string): any;
-    /** @deprecated */
-    getMeasures(measureName?: string): any;
+    getEntries(): PerformanceEntryList;
+    getEntriesByName(name: string, type?: string): PerformanceEntryList;
+    getEntriesByType(type: string): PerformanceEntryList;
     mark(markName: string): void;
-    measure(measureName: string, startMarkName?: string, endMarkName?: string): void;
+    measure(measureName: string, startMark?: string, endMark?: string): void;
     now(): number;
     setResourceTimingBufferSize(maxSize: number): void;
     toJSON(): any;
+    addEventListener<K extends keyof PerformanceEventMap>(type: K, listener: (this: Performance, ev: PerformanceEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
+    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
+    removeEventListener<K extends keyof PerformanceEventMap>(type: K, listener: (this: Performance, ev: PerformanceEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
+    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
 }
 
 declare var Performance: {
@@ -9910,42 +10828,18 @@ declare var PerformanceNavigation: {
     readonly TYPE_RESERVED: number;
 };
 
-interface PerformanceNavigationTiming extends PerformanceEntry {
-    /** @deprecated */
-    readonly connectEnd: number;
-    /** @deprecated */
-    readonly connectStart: number;
+interface PerformanceNavigationTiming extends PerformanceResourceTiming {
     readonly domComplete: number;
     readonly domContentLoadedEventEnd: number;
     readonly domContentLoadedEventStart: number;
     readonly domInteractive: number;
-    /** @deprecated */
-    readonly domLoading: number;
-    /** @deprecated */
-    readonly domainLookupEnd: number;
-    /** @deprecated */
-    readonly domainLookupStart: number;
-    /** @deprecated */
-    readonly fetchStart: number;
     readonly loadEventEnd: number;
     readonly loadEventStart: number;
-    /** @deprecated */
-    readonly navigationStart: number;
     readonly redirectCount: number;
-    /** @deprecated */
-    readonly redirectEnd: number;
-    /** @deprecated */
-    readonly redirectStart: number;
-    /** @deprecated */
-    readonly requestStart: number;
-    /** @deprecated */
-    readonly responseEnd: number;
-    /** @deprecated */
-    readonly responseStart: number;
     readonly type: NavigationType;
     readonly unloadEventEnd: number;
     readonly unloadEventStart: number;
-    readonly workerStart: number;
+    toJSON(): any;
 }
 
 declare var PerformanceNavigationTiming: {
@@ -9953,19 +10847,47 @@ declare var PerformanceNavigationTiming: {
     new(): PerformanceNavigationTiming;
 };
 
+interface PerformanceObserver {
+    disconnect(): void;
+    observe(options: PerformanceObserverInit): void;
+    takeRecords(): PerformanceEntryList;
+}
+
+declare var PerformanceObserver: {
+    prototype: PerformanceObserver;
+    new(callback: PerformanceObserverCallback): PerformanceObserver;
+};
+
+interface PerformanceObserverEntryList {
+    getEntries(): PerformanceEntryList;
+    getEntriesByName(name: string, type?: string): PerformanceEntryList;
+    getEntriesByType(type: string): PerformanceEntryList;
+}
+
+declare var PerformanceObserverEntryList: {
+    prototype: PerformanceObserverEntryList;
+    new(): PerformanceObserverEntryList;
+};
+
 interface PerformanceResourceTiming extends PerformanceEntry {
     readonly connectEnd: number;
     readonly connectStart: number;
+    readonly decodedBodySize: number;
     readonly domainLookupEnd: number;
     readonly domainLookupStart: number;
+    readonly encodedBodySize: number;
     readonly fetchStart: number;
     readonly initiatorType: string;
+    readonly nextHopProtocol: string;
     readonly redirectEnd: number;
     readonly redirectStart: number;
     readonly requestStart: number;
     readonly responseEnd: number;
     readonly responseStart: number;
+    readonly secureConnectionStart: number;
+    readonly transferSize: number;
     readonly workerStart: number;
+    toJSON(): any;
 }
 
 declare var PerformanceResourceTiming: {
@@ -9986,7 +10908,6 @@ interface PerformanceTiming {
     readonly fetchStart: number;
     readonly loadEventEnd: number;
     readonly loadEventStart: number;
-    readonly msFirstPaint: number;
     readonly navigationStart: number;
     readonly redirectEnd: number;
     readonly redirectStart: number;
@@ -10009,7 +10930,7 @@ interface PeriodicWave {
 
 declare var PeriodicWave: {
     prototype: PeriodicWave;
-    new(): PeriodicWave;
+    new(context: BaseAudioContext, options?: PeriodicWaveOptions): PeriodicWave;
 };
 
 interface PermissionRequest extends DeferredPermissionRequest {
@@ -10061,26 +10982,21 @@ declare var PluginArray: {
 };
 
 interface PointerEvent extends MouseEvent {
-    readonly currentPoint: any;
     readonly height: number;
-    readonly hwTimestamp: number;
-    readonly intermediatePoints: any;
     readonly isPrimary: boolean;
     readonly pointerId: number;
-    readonly pointerType: any;
+    readonly pointerType: string;
     readonly pressure: number;
-    readonly rotation: number;
+    readonly tangentialPressure: number;
     readonly tiltX: number;
     readonly tiltY: number;
+    readonly twist: number;
     readonly width: number;
-    getCurrentPoint(element: Element): void;
-    getIntermediatePoints(element: Element): void;
-    initPointerEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number, screenXArg: number, screenYArg: number, clientXArg: number, clientYArg: number, ctrlKeyArg: boolean, altKeyArg: boolean, shiftKeyArg: boolean, metaKeyArg: boolean, buttonArg: number, relatedTargetArg: EventTarget, offsetXArg: number, offsetYArg: number, widthArg: number, heightArg: number, pressure: number, rotation: number, tiltX: number, tiltY: number, pointerIdArg: number, pointerType: any, hwTimestampArg: number, isPrimary: boolean): void;
 }
 
 declare var PointerEvent: {
     prototype: PointerEvent;
-    new(typeArg: string, eventInitDict?: PointerEventInit): PointerEvent;
+    new(type: string, eventInitDict?: PointerEventInit): PointerEvent;
 };
 
 interface PopStateEvent extends Event {
@@ -10097,28 +11013,14 @@ interface Position {
     readonly timestamp: number;
 }
 
-declare var Position: {
-    prototype: Position;
-    new(): Position;
-};
-
 interface PositionError {
     readonly code: number;
     readonly message: string;
-    toString(): string;
     readonly PERMISSION_DENIED: number;
     readonly POSITION_UNAVAILABLE: number;
     readonly TIMEOUT: number;
 }
 
-declare var PositionError: {
-    prototype: PositionError;
-    new(): PositionError;
-    readonly PERMISSION_DENIED: number;
-    readonly POSITION_UNAVAILABLE: number;
-    readonly TIMEOUT: number;
-};
-
 interface ProcessingInstruction extends CharacterData {
     readonly target: string;
 }
@@ -10132,12 +11034,11 @@ interface ProgressEvent extends Event {
     readonly lengthComputable: boolean;
     readonly loaded: number;
     readonly total: number;
-    initProgressEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, lengthComputableArg: boolean, loadedArg: number, totalArg: number): void;
 }
 
 declare var ProgressEvent: {
     prototype: ProgressEvent;
-    new(typeArg: string, eventInitDict?: ProgressEventInit): ProgressEvent;
+    new(type: string, eventInitDict?: ProgressEventInit): ProgressEvent;
 };
 
 interface PromiseRejectionEvent extends Event {
@@ -10145,13 +11046,12 @@ interface PromiseRejectionEvent extends Event {
     readonly reason: any;
 }
 
-interface PromiseRejectionEventInit extends EventInit {
-    promise: PromiseLike<any>;
-    reason?: any;
-}
+declare var PromiseRejectionEvent: {
+    prototype: PromiseRejectionEvent;
+    new(type: string, eventInitDict: PromiseRejectionEventInit): PromiseRejectionEvent;
+};
 
 interface PushManager {
-    readonly supportedContentEncodings: ReadonlyArray<string>;
     getSubscription(): Promise<PushSubscription | null>;
     permissionState(options?: PushSubscriptionOptionsInit): Promise<PushPermissionState>;
     subscribe(options?: PushSubscriptionOptionsInit): Promise<PushSubscription>;
@@ -10160,6 +11060,7 @@ interface PushManager {
 declare var PushManager: {
     prototype: PushManager;
     new(): PushManager;
+    readonly supportedContentEncodings: ReadonlyArray<string>;
 };
 
 interface PushSubscription {
@@ -10167,7 +11068,7 @@ interface PushSubscription {
     readonly expirationTime: number | null;
     readonly options: PushSubscriptionOptions;
     getKey(name: PushEncryptionKeyName): ArrayBuffer | null;
-    toJSON(): any;
+    toJSON(): PushSubscriptionJSON;
     unsubscribe(): Promise<boolean>;
 }
 
@@ -10186,30 +11087,108 @@ declare var PushSubscriptionOptions: {
     new(): PushSubscriptionOptions;
 };
 
+interface RTCCertificate {
+    readonly expires: number;
+    getFingerprints(): RTCDtlsFingerprint[];
+}
+
+declare var RTCCertificate: {
+    prototype: RTCCertificate;
+    new(): RTCCertificate;
+    getSupportedAlgorithms(): AlgorithmIdentifier[];
+};
+
+interface RTCDTMFSenderEventMap {
+    "tonechange": RTCDTMFToneChangeEvent;
+}
+
+interface RTCDTMFSender extends EventTarget {
+    readonly canInsertDTMF: boolean;
+    ontonechange: ((this: RTCDTMFSender, ev: RTCDTMFToneChangeEvent) => any) | null;
+    readonly toneBuffer: string;
+    insertDTMF(tones: string, duration?: number, interToneGap?: number): void;
+    addEventListener<K extends keyof RTCDTMFSenderEventMap>(type: K, listener: (this: RTCDTMFSender, ev: RTCDTMFSenderEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
+    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
+    removeEventListener<K extends keyof RTCDTMFSenderEventMap>(type: K, listener: (this: RTCDTMFSender, ev: RTCDTMFSenderEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
+    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
+}
+
+declare var RTCDTMFSender: {
+    prototype: RTCDTMFSender;
+    new(): RTCDTMFSender;
+};
+
 interface RTCDTMFToneChangeEvent extends Event {
     readonly tone: string;
 }
 
 declare var RTCDTMFToneChangeEvent: {
     prototype: RTCDTMFToneChangeEvent;
-    new(typeArg: string, eventInitDict: RTCDTMFToneChangeEventInit): RTCDTMFToneChangeEvent;
+    new(type: string, eventInitDict: RTCDTMFToneChangeEventInit): RTCDTMFToneChangeEvent;
+};
+
+interface RTCDataChannelEventMap {
+    "bufferedamountlow": Event;
+    "close": Event;
+    "error": RTCErrorEvent;
+    "message": MessageEvent;
+    "open": Event;
+}
+
+interface RTCDataChannel extends EventTarget {
+    binaryType: string;
+    readonly bufferedAmount: number;
+    bufferedAmountLowThreshold: number;
+    readonly id: number | null;
+    readonly label: string;
+    readonly maxPacketLifeTime: number | null;
+    readonly maxRetransmits: number | null;
+    readonly negotiated: boolean;
+    onbufferedamountlow: ((this: RTCDataChannel, ev: Event) => any) | null;
+    onclose: ((this: RTCDataChannel, ev: Event) => any) | null;
+    onerror: ((this: RTCDataChannel, ev: RTCErrorEvent) => any) | null;
+    onmessage: ((this: RTCDataChannel, ev: MessageEvent) => any) | null;
+    onopen: ((this: RTCDataChannel, ev: Event) => any) | null;
+    readonly ordered: boolean;
+    readonly priority: RTCPriorityType;
+    readonly protocol: string;
+    readonly readyState: RTCDataChannelState;
+    close(): void;
+    send(data: string): void;
+    send(data: Blob): void;
+    send(data: ArrayBuffer): void;
+    send(data: ArrayBufferView): void;
+    addEventListener<K extends keyof RTCDataChannelEventMap>(type: K, listener: (this: RTCDataChannel, ev: RTCDataChannelEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
+    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
+    removeEventListener<K extends keyof RTCDataChannelEventMap>(type: K, listener: (this: RTCDataChannel, ev: RTCDataChannelEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
+    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
+}
+
+declare var RTCDataChannel: {
+    prototype: RTCDataChannel;
+    new(): RTCDataChannel;
+};
+
+interface RTCDataChannelEvent extends Event {
+    readonly channel: RTCDataChannel;
+}
+
+declare var RTCDataChannelEvent: {
+    prototype: RTCDataChannelEvent;
+    new(type: string, eventInitDict: RTCDataChannelEventInit): RTCDataChannelEvent;
 };
 
 interface RTCDtlsTransportEventMap {
-    "dtlsstatechange": RTCDtlsTransportStateChangedEvent;
-    "error": Event;
+    "error": RTCErrorEvent;
+    "statechange": Event;
 }
 
-interface RTCDtlsTransport extends RTCStatsProvider {
-    ondtlsstatechange: ((this: RTCDtlsTransport, ev: RTCDtlsTransportStateChangedEvent) => any) | null;
-    onerror: ((this: RTCDtlsTransport, ev: Event) => any) | null;
+interface RTCDtlsTransport extends EventTarget {
+    onerror: ((this: RTCDtlsTransport, ev: RTCErrorEvent) => any) | null;
+    onstatechange: ((this: RTCDtlsTransport, ev: Event) => any) | null;
     readonly state: RTCDtlsTransportState;
     readonly transport: RTCIceTransport;
-    getLocalParameters(): RTCDtlsParameters;
     getRemoteCertificates(): ArrayBuffer[];
-    getRemoteParameters(): RTCDtlsParameters | null;
-    start(remoteParameters: RTCDtlsParameters): void;
-    stop(): void;
     addEventListener<K extends keyof RTCDtlsTransportEventMap>(type: K, listener: (this: RTCDtlsTransport, ev: RTCDtlsTransportEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
     addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
     removeEventListener<K extends keyof RTCDtlsTransportEventMap>(type: K, listener: (this: RTCDtlsTransport, ev: RTCDtlsTransportEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
@@ -10218,7 +11197,7 @@ interface RTCDtlsTransport extends RTCStatsProvider {
 
 declare var RTCDtlsTransport: {
     prototype: RTCDtlsTransport;
-    new(transport: RTCIceTransport): RTCDtlsTransport;
+    new(): RTCDtlsTransport;
 };
 
 interface RTCDtlsTransportStateChangedEvent extends Event {
@@ -10253,11 +11232,47 @@ declare var RTCDtmfSender: {
     new(sender: RTCRtpSender): RTCDtmfSender;
 };
 
+interface RTCError extends Error {
+    errorDetail: string;
+    httpRequestStatusCode: number;
+    message: string;
+    name: string;
+    receivedAlert: number | null;
+    sctpCauseCode: number;
+    sdpLineNumber: number;
+    sentAlert: number | null;
+}
+
+declare var RTCError: {
+    prototype: RTCError;
+    new(errorDetail?: string, message?: string): RTCError;
+};
+
+interface RTCErrorEvent extends Event {
+    readonly error: RTCError | null;
+}
+
+declare var RTCErrorEvent: {
+    prototype: RTCErrorEvent;
+    new(type: string, eventInitDict: RTCErrorEventInit): RTCErrorEvent;
+};
+
 interface RTCIceCandidate {
-    candidate: string | null;
-    sdpMLineIndex: number | null;
-    sdpMid: string | null;
-    toJSON(): any;
+    readonly candidate: string;
+    readonly component: RTCIceComponent | null;
+    readonly foundation: string | null;
+    readonly ip: string | null;
+    readonly port: number | null;
+    readonly priority: number | null;
+    readonly protocol: RTCIceProtocol | null;
+    readonly relatedAddress: string | null;
+    readonly relatedPort: number | null;
+    readonly sdpMLineIndex: number | null;
+    readonly sdpMid: string | null;
+    readonly tcpType: RTCIceTcpCandidateType | null;
+    readonly type: RTCIceCandidateType | null;
+    readonly usernameFragment: string | null;
+    toJSON(): RTCIceCandidateInit;
 }
 
 declare var RTCIceCandidate: {
@@ -10307,25 +11322,24 @@ declare var RTCIceGathererEvent: {
 };
 
 interface RTCIceTransportEventMap {
-    "candidatepairchange": RTCIceCandidatePairChangedEvent;
-    "icestatechange": RTCIceTransportStateChangedEvent;
+    "gatheringstatechange": Event;
+    "selectedcandidatepairchange": Event;
+    "statechange": Event;
 }
 
-interface RTCIceTransport extends RTCStatsProvider {
+interface RTCIceTransport extends EventTarget {
     readonly component: RTCIceComponent;
-    readonly iceGatherer: RTCIceGatherer | null;
-    oncandidatepairchange: ((this: RTCIceTransport, ev: RTCIceCandidatePairChangedEvent) => any) | null;
-    onicestatechange: ((this: RTCIceTransport, ev: RTCIceTransportStateChangedEvent) => any) | null;
+    readonly gatheringState: RTCIceGathererState;
+    ongatheringstatechange: ((this: RTCIceTransport, ev: Event) => any) | null;
+    onselectedcandidatepairchange: ((this: RTCIceTransport, ev: Event) => any) | null;
+    onstatechange: ((this: RTCIceTransport, ev: Event) => any) | null;
     readonly role: RTCIceRole;
     readonly state: RTCIceTransportState;
-    addRemoteCandidate(remoteCandidate: RTCIceCandidateDictionary | RTCIceCandidateComplete): void;
-    createAssociatedTransport(): RTCIceTransport;
-    getNominatedCandidatePair(): RTCIceCandidatePair | null;
-    getRemoteCandidates(): RTCIceCandidateDictionary[];
+    getLocalCandidates(): RTCIceCandidate[];
+    getLocalParameters(): RTCIceParameters | null;
+    getRemoteCandidates(): RTCIceCandidate[];
     getRemoteParameters(): RTCIceParameters | null;
-    setRemoteCandidates(remoteCandidates: RTCIceCandidateDictionary[]): void;
-    start(gatherer: RTCIceGatherer, remoteParameters: RTCIceParameters, role?: RTCIceRole): void;
-    stop(): void;
+    getSelectedCandidatePair(): RTCIceCandidatePair | null;
     addEventListener<K extends keyof RTCIceTransportEventMap>(type: K, listener: (this: RTCIceTransport, ev: RTCIceTransportEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
     addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
     removeEventListener<K extends keyof RTCIceTransportEventMap>(type: K, listener: (this: RTCIceTransport, ev: RTCIceTransportEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
@@ -10346,41 +11360,71 @@ declare var RTCIceTransportStateChangedEvent: {
     new(): RTCIceTransportStateChangedEvent;
 };
 
+interface RTCIdentityAssertion {
+    idp: string;
+    name: string;
+}
+
+declare var RTCIdentityAssertion: {
+    prototype: RTCIdentityAssertion;
+    new(idp: string, name: string): RTCIdentityAssertion;
+};
+
 interface RTCPeerConnectionEventMap {
-    "addstream": MediaStreamEvent;
+    "connectionstatechange": Event;
+    "datachannel": RTCDataChannelEvent;
     "icecandidate": RTCPeerConnectionIceEvent;
+    "icecandidateerror": RTCPeerConnectionIceErrorEvent;
     "iceconnectionstatechange": Event;
     "icegatheringstatechange": Event;
     "negotiationneeded": Event;
-    "removestream": MediaStreamEvent;
     "signalingstatechange": Event;
+    "statsended": RTCStatsEvent;
+    "track": RTCTrackEvent;
 }
 
 interface RTCPeerConnection extends EventTarget {
     readonly canTrickleIceCandidates: boolean | null;
+    readonly connectionState: RTCPeerConnectionState;
+    readonly currentLocalDescription: RTCSessionDescription | null;
+    readonly currentRemoteDescription: RTCSessionDescription | null;
     readonly iceConnectionState: RTCIceConnectionState;
     readonly iceGatheringState: RTCIceGatheringState;
+    readonly idpErrorInfo: string | null;
+    readonly idpLoginUrl: string | null;
     readonly localDescription: RTCSessionDescription | null;
-    onaddstream: ((this: RTCPeerConnection, ev: MediaStreamEvent) => any) | null;
+    onconnectionstatechange: ((this: RTCPeerConnection, ev: Event) => any) | null;
+    ondatachannel: ((this: RTCPeerConnection, ev: RTCDataChannelEvent) => any) | null;
     onicecandidate: ((this: RTCPeerConnection, ev: RTCPeerConnectionIceEvent) => any) | null;
+    onicecandidateerror: ((this: RTCPeerConnection, ev: RTCPeerConnectionIceErrorEvent) => any) | null;
     oniceconnectionstatechange: ((this: RTCPeerConnection, ev: Event) => any) | null;
     onicegatheringstatechange: ((this: RTCPeerConnection, ev: Event) => any) | null;
     onnegotiationneeded: ((this: RTCPeerConnection, ev: Event) => any) | null;
-    onremovestream: ((this: RTCPeerConnection, ev: MediaStreamEvent) => any) | null;
     onsignalingstatechange: ((this: RTCPeerConnection, ev: Event) => any) | null;
+    onstatsended: ((this: RTCPeerConnection, ev: RTCStatsEvent) => any) | null;
+    ontrack: ((this: RTCPeerConnection, ev: RTCTrackEvent) => any) | null;
+    readonly peerIdentity: Promise<RTCIdentityAssertion>;
+    readonly pendingLocalDescription: RTCSessionDescription | null;
+    readonly pendingRemoteDescription: RTCSessionDescription | null;
     readonly remoteDescription: RTCSessionDescription | null;
+    readonly sctp: RTCSctpTransport | null;
     readonly signalingState: RTCSignalingState;
     addIceCandidate(candidate: RTCIceCandidateInit | RTCIceCandidate): Promise<void>;
-    addStream(stream: MediaStream): void;
+    addTrack(track: MediaStreamTrack, ...streams: MediaStream[]): RTCRtpSender;
+    addTransceiver(trackOrKind: MediaStreamTrack | string, init?: RTCRtpTransceiverInit): RTCRtpTransceiver;
     close(): void;
     createAnswer(options?: RTCOfferOptions): Promise<RTCSessionDescriptionInit>;
+    createDataChannel(label: string, dataChannelDict?: RTCDataChannelInit): RTCDataChannel;
     createOffer(options?: RTCOfferOptions): Promise<RTCSessionDescriptionInit>;
     getConfiguration(): RTCConfiguration;
-    getLocalStreams(): MediaStream[];
-    getRemoteStreams(): MediaStream[];
-    getStats(selector: MediaStreamTrack | null, successCallback?: RTCStatsCallback, failureCallback?: RTCPeerConnectionErrorCallback): Promise<RTCStatsReport>;
-    getStreamById(streamId: string): MediaStream | null;
-    removeStream(stream: MediaStream): void;
+    getIdentityAssertion(): Promise<string>;
+    getReceivers(): RTCRtpReceiver[];
+    getSenders(): RTCRtpSender[];
+    getStats(selector?: MediaStreamTrack | null): Promise<RTCStatsReport>;
+    getTransceivers(): RTCRtpTransceiver[];
+    removeTrack(sender: RTCRtpSender): void;
+    setConfiguration(configuration: RTCConfiguration): void;
+    setIdentityProvider(provider: string, options?: RTCIdentityProviderOptions): void;
     setLocalDescription(description: RTCSessionDescriptionInit): Promise<void>;
     setRemoteDescription(description: RTCSessionDescriptionInit): Promise<void>;
     addEventListener<K extends keyof RTCPeerConnectionEventMap>(type: K, listener: (this: RTCPeerConnection, ev: RTCPeerConnectionEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
@@ -10391,84 +11435,113 @@ interface RTCPeerConnection extends EventTarget {
 
 declare var RTCPeerConnection: {
     prototype: RTCPeerConnection;
-    new(configuration: RTCConfiguration): RTCPeerConnection;
+    new(configuration?: RTCConfiguration): RTCPeerConnection;
+    generateCertificate(keygenAlgorithm: AlgorithmIdentifier): Promise<RTCCertificate>;
+    getDefaultIceServers(): RTCIceServer[];
+};
+
+interface RTCPeerConnectionIceErrorEvent extends Event {
+    readonly errorCode: number;
+    readonly errorText: string;
+    readonly hostCandidate: string;
+    readonly url: string;
+}
+
+declare var RTCPeerConnectionIceErrorEvent: {
+    prototype: RTCPeerConnectionIceErrorEvent;
+    new(type: string, eventInitDict: RTCPeerConnectionIceErrorEventInit): RTCPeerConnectionIceErrorEvent;
 };
 
 interface RTCPeerConnectionIceEvent extends Event {
-    readonly candidate: RTCIceCandidate;
+    readonly candidate: RTCIceCandidate | null;
+    readonly url: string | null;
 }
 
 declare var RTCPeerConnectionIceEvent: {
     prototype: RTCPeerConnectionIceEvent;
-    new(type: string, eventInitDict: RTCPeerConnectionIceEventInit): RTCPeerConnectionIceEvent;
+    new(type: string, eventInitDict?: RTCPeerConnectionIceEventInit): RTCPeerConnectionIceEvent;
 };
 
-interface RTCRtpReceiverEventMap {
-    "error": Event;
-    "msdecodercapacitychange": Event;
-    "msdsh": Event;
-}
-
-interface RTCRtpReceiver extends RTCStatsProvider {
-    onerror: ((this: RTCRtpReceiver, ev: Event) => any) | null;
-    onmsdecodercapacitychange: ((this: RTCRtpReceiver, ev: Event) => any) | null;
-    onmsdsh: ((this: RTCRtpReceiver, ev: Event) => any) | null;
-    readonly rtcpTransport: RTCDtlsTransport;
-    readonly track: MediaStreamTrack | null;
-    readonly transport: RTCDtlsTransport | RTCSrtpSdesTransport;
+interface RTCRtpReceiver {
+    readonly rtcpTransport: RTCDtlsTransport | null;
+    readonly track: MediaStreamTrack;
+    readonly transport: RTCDtlsTransport | null;
     getContributingSources(): RTCRtpContributingSource[];
-    receive(parameters: RTCRtpParameters): void;
-    requestSendCSRC(csrc: number): void;
-    setTransport(transport: RTCDtlsTransport | RTCSrtpSdesTransport, rtcpTransport?: RTCDtlsTransport): void;
-    stop(): void;
-    addEventListener<K extends keyof RTCRtpReceiverEventMap>(type: K, listener: (this: RTCRtpReceiver, ev: RTCRtpReceiverEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCRtpReceiverEventMap>(type: K, listener: (this: RTCRtpReceiver, ev: RTCRtpReceiverEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
+    getParameters(): RTCRtpReceiveParameters;
+    getStats(): Promise<RTCStatsReport>;
+    getSynchronizationSources(): RTCRtpSynchronizationSource[];
 }
 
 declare var RTCRtpReceiver: {
     prototype: RTCRtpReceiver;
-    new(transport: RTCDtlsTransport | RTCSrtpSdesTransport, kind: string, rtcpTransport?: RTCDtlsTransport): RTCRtpReceiver;
-    getCapabilities(kind?: string): RTCRtpCapabilities;
+    new(): RTCRtpReceiver;
+    getCapabilities(kind: string): RTCRtpCapabilities;
 };
 
-interface RTCRtpSenderEventMap {
-    "error": Event;
-    "ssrcconflict": RTCSsrcConflictEvent;
-}
-
-interface RTCRtpSender extends RTCStatsProvider {
-    onerror: ((this: RTCRtpSender, ev: Event) => any) | null;
-    onssrcconflict: ((this: RTCRtpSender, ev: RTCSsrcConflictEvent) => any) | null;
-    readonly rtcpTransport: RTCDtlsTransport;
-    readonly track: MediaStreamTrack;
-    readonly transport: RTCDtlsTransport | RTCSrtpSdesTransport;
-    send(parameters: RTCRtpParameters): void;
-    setTrack(track: MediaStreamTrack): void;
-    setTransport(transport: RTCDtlsTransport | RTCSrtpSdesTransport, rtcpTransport?: RTCDtlsTransport): void;
-    stop(): void;
-    addEventListener<K extends keyof RTCRtpSenderEventMap>(type: K, listener: (this: RTCRtpSender, ev: RTCRtpSenderEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCRtpSenderEventMap>(type: K, listener: (this: RTCRtpSender, ev: RTCRtpSenderEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
+interface RTCRtpSender {
+    readonly dtmf: RTCDTMFSender | null;
+    readonly rtcpTransport: RTCDtlsTransport | null;
+    readonly track: MediaStreamTrack | null;
+    readonly transport: RTCDtlsTransport | null;
+    getParameters(): RTCRtpSendParameters;
+    getStats(): Promise<RTCStatsReport>;
+    replaceTrack(withTrack: MediaStreamTrack | null): Promise<void>;
+    setParameters(parameters: RTCRtpSendParameters): Promise<void>;
+    setStreams(...streams: MediaStream[]): void;
 }
 
 declare var RTCRtpSender: {
     prototype: RTCRtpSender;
-    new(track: MediaStreamTrack, transport: RTCDtlsTransport | RTCSrtpSdesTransport, rtcpTransport?: RTCDtlsTransport): RTCRtpSender;
-    getCapabilities(kind?: string): RTCRtpCapabilities;
+    new(): RTCRtpSender;
+    getCapabilities(kind: string): RTCRtpCapabilities;
+};
+
+interface RTCRtpTransceiver {
+    readonly currentDirection: RTCRtpTransceiverDirection | null;
+    direction: RTCRtpTransceiverDirection;
+    readonly mid: string | null;
+    readonly receiver: RTCRtpReceiver;
+    readonly sender: RTCRtpSender;
+    readonly stopped: boolean;
+    setCodecPreferences(codecs: RTCRtpCodecCapability[]): void;
+    stop(): void;
+}
+
+declare var RTCRtpTransceiver: {
+    prototype: RTCRtpTransceiver;
+    new(): RTCRtpTransceiver;
+};
+
+interface RTCSctpTransportEventMap {
+    "statechange": Event;
+}
+
+interface RTCSctpTransport {
+    readonly maxChannels: number | null;
+    readonly maxMessageSize: number;
+    onstatechange: ((this: RTCSctpTransport, ev: Event) => any) | null;
+    readonly state: RTCSctpTransportState;
+    readonly transport: RTCDtlsTransport;
+    addEventListener<K extends keyof RTCSctpTransportEventMap>(type: K, listener: (this: RTCSctpTransport, ev: RTCSctpTransportEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
+    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
+    removeEventListener<K extends keyof RTCSctpTransportEventMap>(type: K, listener: (this: RTCSctpTransport, ev: RTCSctpTransportEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
+    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
+}
+
+declare var RTCSctpTransport: {
+    prototype: RTCSctpTransport;
+    new(): RTCSctpTransport;
 };
 
 interface RTCSessionDescription {
-    sdp: string | null;
-    type: RTCSdpType | null;
+    readonly sdp: string;
+    readonly type: RTCSdpType;
     toJSON(): any;
 }
 
 declare var RTCSessionDescription: {
     prototype: RTCSessionDescription;
-    new(descriptionInitDict?: RTCSessionDescriptionInit): RTCSessionDescription;
+    new(descriptionInitDict: RTCSessionDescriptionInit): RTCSessionDescription;
 };
 
 interface RTCSrtpSdesTransportEventMap {
@@ -10499,6 +11572,15 @@ declare var RTCSsrcConflictEvent: {
     new(): RTCSsrcConflictEvent;
 };
 
+interface RTCStatsEvent extends Event {
+    readonly report: RTCStatsReport;
+}
+
+declare var RTCStatsEvent: {
+    prototype: RTCStatsEvent;
+    new(type: string, eventInitDict: RTCStatsEventInit): RTCStatsEvent;
+};
+
 interface RTCStatsProvider extends EventTarget {
     getStats(): Promise<RTCStatsReport>;
     msGetStats(): Promise<RTCStatsReport>;
@@ -10509,6 +11591,36 @@ declare var RTCStatsProvider: {
     new(): RTCStatsProvider;
 };
 
+interface RTCStatsReport {
+    forEach(callbackfn: (value: any, key: string, parent: RTCStatsReport) => void, thisArg?: any): void;
+}
+
+declare var RTCStatsReport: {
+    prototype: RTCStatsReport;
+    new(): RTCStatsReport;
+};
+
+interface RTCTrackEvent extends Event {
+    readonly receiver: RTCRtpReceiver;
+    readonly streams: ReadonlyArray<MediaStream>;
+    readonly track: MediaStreamTrack;
+    readonly transceiver: RTCRtpTransceiver;
+}
+
+declare var RTCTrackEvent: {
+    prototype: RTCTrackEvent;
+    new(type: string, eventInitDict: RTCTrackEventInit): RTCTrackEvent;
+};
+
+interface RadioNodeList extends NodeList {
+    value: string;
+}
+
+declare var RadioNodeList: {
+    prototype: RadioNodeList;
+    new(): RadioNodeList;
+};
+
 interface RandomSource {
     getRandomValues<T extends Int8Array | Uint8ClampedArray | Uint8Array | Int16Array | Uint16Array | Int32Array | Uint32Array>(array: T): T;
 }
@@ -10586,35 +11698,97 @@ declare var ReadableStreamReader: {
 };
 
 interface Request extends Body {
+    /**
+     * Returns the cache mode associated with request, which is a string indicating
+     * how the the request will interact with the browser's cache when fetching.
+     */
     readonly cache: RequestCache;
+    /**
+     * Returns the credentials mode associated with request, which is a string
+     * indicating whether credentials will be sent with the request always, never, or only when sent to a
+     * same-origin URL.
+     */
     readonly credentials: RequestCredentials;
+    /**
+     * Returns the kind of resource requested by request, e.g., "document" or
+     * "script".
+     */
     readonly destination: RequestDestination;
+    /**
+     * Returns a Headers object consisting of the headers associated with request.
+     * Note that headers added in the network layer by the user agent will not be accounted for in this
+     * object, e.g., the "Host" header.
+     */
     readonly headers: Headers;
+    /**
+     * Returns request's subresource integrity metadata, which is a cryptographic hash of
+     * the resource being fetched. Its value consists of multiple hashes separated by whitespace. [SRI]
+     */
     readonly integrity: string;
+    /**
+     * Returns a boolean indicating whether or not request is for a history
+     * navigation (a.k.a. back-foward navigation).
+     */
+    readonly isHistoryNavigation: boolean;
+    /**
+     * Returns a boolean indicating whether or not request is for a reload navigation.
+     */
+    readonly isReloadNavigation: boolean;
+    /**
+     * Returns a boolean indicating whether or not request can outlive the global in which
+     * it was created.
+     */
     readonly keepalive: boolean;
+    /**
+     * Returns request's HTTP method, which is "GET" by default.
+     */
     readonly method: string;
+    /**
+     * Returns the mode associated with request, which is a string indicating
+     * whether the request will use CORS, or will be restricted to same-origin URLs.
+     */
     readonly mode: RequestMode;
+    /**
+     * Returns the redirect mode associated with request, which is a string
+     * indicating how redirects for the request will be handled during fetching. A request will follow redirects by default.
+     */
     readonly redirect: RequestRedirect;
+    /**
+     * Returns the referrer of request. Its value can be a same-origin URL if
+     * explicitly set in init, the empty string to indicate no referrer, and
+     * "about:client" when defaulting to the global's default. This is used during
+     * fetching to determine the value of the `Referer` header of the request being made.
+     */
     readonly referrer: string;
+    /**
+     * Returns the referrer policy associated with request. This is used during
+     * fetching to compute the value of the request's referrer.
+     */
     readonly referrerPolicy: ReferrerPolicy;
-    readonly signal: AbortSignal | null;
-    readonly type: RequestType;
+    /**
+     * Returns the signal associated with request, which is an AbortSignal object indicating whether or not request has been aborted, and its abort
+     * event handler.
+     */
+    readonly signal: AbortSignal;
+    /**
+     * Returns the URL of request as a string.
+     */
     readonly url: string;
     clone(): Request;
 }
 
 declare var Request: {
     prototype: Request;
-    new(input: Request | string, init?: RequestInit): Request;
+    new(input: RequestInfo, init?: RequestInit): Request;
 };
 
 interface Response extends Body {
-    readonly body: ReadableStream | null;
     readonly headers: Headers;
     readonly ok: boolean;
     readonly redirected: boolean;
     readonly status: number;
     readonly statusText: string;
+    readonly trailer: Promise<Headers>;
     readonly type: ResponseType;
     readonly url: string;
     clone(): Response;
@@ -10622,7 +11796,7 @@ interface Response extends Body {
 
 declare var Response: {
     prototype: Response;
-    new(body?: Blob | Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | FormData | string | null, init?: ResponseInit): Response;
+    new(body?: BodyInit | null, init?: ResponseInit): Response;
     error(): Response;
     redirect(url: string, status?: number): Response;
 };
@@ -11675,31 +12849,6 @@ declare var SVGMaskElement: {
     new(): SVGMaskElement;
 };
 
-interface SVGMatrix {
-    a: number;
-    b: number;
-    c: number;
-    d: number;
-    e: number;
-    f: number;
-    flipX(): SVGMatrix;
-    flipY(): SVGMatrix;
-    inverse(): SVGMatrix;
-    multiply(secondMatrix: SVGMatrix): SVGMatrix;
-    rotate(angle: number): SVGMatrix;
-    rotateFromVector(x: number, y: number): SVGMatrix;
-    scale(scaleFactor: number): SVGMatrix;
-    scaleNonUniform(scaleFactorX: number, scaleFactorY: number): SVGMatrix;
-    skewX(angle: number): SVGMatrix;
-    skewY(angle: number): SVGMatrix;
-    translate(x: number, y: number): SVGMatrix;
-}
-
-declare var SVGMatrix: {
-    prototype: SVGMatrix;
-    new(): SVGMatrix;
-};
-
 interface SVGMetadataElement extends SVGElement {
     addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGMetadataElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
     addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
@@ -12088,17 +13237,6 @@ declare var SVGPatternElement: {
     new(): SVGPatternElement;
 };
 
-interface SVGPoint {
-    x: number;
-    y: number;
-    matrixTransform(matrix: SVGMatrix): SVGPoint;
-}
-
-declare var SVGPoint: {
-    prototype: SVGPoint;
-    new(): SVGPoint;
-};
-
 interface SVGPointList {
     readonly numberOfItems: number;
     appendItem(newItem: SVGPoint): SVGPoint;
@@ -12194,18 +13332,6 @@ declare var SVGRadialGradientElement: {
     new(): SVGRadialGradientElement;
 };
 
-interface SVGRect {
-    height: number;
-    width: number;
-    x: number;
-    y: number;
-}
-
-declare var SVGRect: {
-    prototype: SVGRect;
-    new(): SVGRect;
-};
-
 interface SVGRectElement extends SVGGraphicsElement {
     readonly height: SVGAnimatedLength;
     readonly rx: SVGAnimatedLength;
@@ -12344,15 +13470,6 @@ declare var SVGStringList: {
     new(): SVGStringList;
 };
 
-interface SVGStylable {
-    className: any;
-}
-
-declare var SVGStylable: {
-    prototype: SVGStylable;
-    new(): SVGStylable;
-};
-
 interface SVGStyleElement extends SVGElement {
     disabled: boolean;
     media: string;
@@ -12703,20 +13820,6 @@ declare var ScriptProcessorNode: {
     new(): ScriptProcessorNode;
 };
 
-interface ScrollIntoViewOptions extends ScrollOptions {
-    block?: ScrollLogicalPosition;
-    inline?: ScrollLogicalPosition;
-}
-
-interface ScrollOptions {
-    behavior?: ScrollBehavior;
-}
-
-interface ScrollToOptions extends ScrollOptions {
-    left?: number;
-    top?: number;
-}
-
 interface SecurityPolicyViolationEvent extends Event {
     readonly blockedURI: string;
     readonly columnNumber: number;
@@ -12797,18 +13900,18 @@ declare var ServiceWorker: {
 
 interface ServiceWorkerContainerEventMap {
     "controllerchange": Event;
-    "message": ServiceWorkerMessageEvent;
+    "message": MessageEvent;
     "messageerror": MessageEvent;
 }
 
 interface ServiceWorkerContainer extends EventTarget {
     readonly controller: ServiceWorker | null;
     oncontrollerchange: ((this: ServiceWorkerContainer, ev: Event) => any) | null;
-    onmessage: ((this: ServiceWorkerContainer, ev: ServiceWorkerMessageEvent) => any) | null;
+    onmessage: ((this: ServiceWorkerContainer, ev: MessageEvent) => any) | null;
     onmessageerror: ((this: ServiceWorkerContainer, ev: MessageEvent) => any) | null;
     readonly ready: Promise<ServiceWorkerRegistration>;
     getRegistration(clientURL?: string): Promise<ServiceWorkerRegistration | undefined>;
-    getRegistrations(): Promise<ServiceWorkerRegistration[]>;
+    getRegistrations(): Promise<ReadonlyArray<ServiceWorkerRegistration>>;
     register(scriptURL: string, options?: RegistrationOptions): Promise<ServiceWorkerRegistration>;
     startMessages(): void;
     addEventListener<K extends keyof ServiceWorkerContainerEventMap>(type: K, listener: (this: ServiceWorkerContainer, ev: ServiceWorkerContainerEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
@@ -12842,10 +13945,12 @@ interface ServiceWorkerRegistrationEventMap {
 interface ServiceWorkerRegistration extends EventTarget {
     readonly active: ServiceWorker | null;
     readonly installing: ServiceWorker | null;
+    readonly navigationPreload: NavigationPreloadManager;
     onupdatefound: ((this: ServiceWorkerRegistration, ev: Event) => any) | null;
     readonly pushManager: PushManager;
     readonly scope: string;
     readonly sync: SyncManager;
+    readonly updateViaCache: ServiceWorkerUpdateViaCache;
     readonly waiting: ServiceWorker | null;
     getNotifications(filter?: GetNotificationOptions): Promise<Notification[]>;
     showNotification(title: string, options?: NotificationOptions): Promise<void>;
@@ -12997,17 +14102,36 @@ interface StereoPannerNode extends AudioNode {
 
 declare var StereoPannerNode: {
     prototype: StereoPannerNode;
-    new(): StereoPannerNode;
+    new(context: BaseAudioContext, options?: StereoPannerOptions): StereoPannerNode;
 };
 
 interface Storage {
+    /**
+     * Returns the number of key/value pairs currently present in the list associated with the
+     * object.
+     */
     readonly length: number;
+    /**
+     * Empties the list associated with the object of all key/value pairs, if there are any.
+     */
     clear(): void;
+    /**
+     * value = storage[key]
+     */
     getItem(key: string): string | null;
+    /**
+     * Returns the name of the nth key in the list, or null if n is greater
+     * than or equal to the number of key/value pairs in the object.
+     */
     key(index: number): string | null;
+    /**
+     * delete storage[key]
+     */
     removeItem(key: string): void;
+    /**
+     * storage[key] = value
+     */
     setItem(key: string, value: string): void;
-    [key: string]: any;
 }
 
 declare var Storage: {
@@ -13016,26 +14140,44 @@ declare var Storage: {
 };
 
 interface StorageEvent extends Event {
+    /**
+     * Returns the key of the storage item being changed.
+     */
     readonly key: string | null;
+    /**
+     * Returns the new value of the key of the storage item whose value is being changed.
+     */
     readonly newValue: string | null;
+    /**
+     * Returns the old value of the key of the storage item whose value is being changed.
+     */
     readonly oldValue: string | null;
+    /**
+     * Returns the Storage object that was affected.
+     */
     readonly storageArea: Storage | null;
+    /**
+     * Returns the URL of the document whose storage item changed.
+     */
     readonly url: string;
 }
 
 declare var StorageEvent: {
     prototype: StorageEvent;
-    new (type: string, eventInitDict?: StorageEventInit): StorageEvent;
+    new(type: string, eventInitDict?: StorageEventInit): StorageEvent;
 };
 
-interface StorageEventInit extends EventInit {
-    key?: string;
-    newValue?: string;
-    oldValue?: string;
-    storageArea?: Storage;
-    url: string;
+interface StorageManager {
+    estimate(): Promise<StorageEstimate>;
+    persist(): Promise<boolean>;
+    persisted(): Promise<boolean>;
 }
 
+declare var StorageManager: {
+    prototype: StorageManager;
+    new(): StorageManager;
+};
+
 interface StyleMedia {
     readonly type: string;
     matchMedium(mediaquery: string): boolean;
@@ -13084,9 +14226,9 @@ interface SubtleCrypto {
     generateKey(algorithm: string, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKeyPair | CryptoKey>;
     generateKey(algorithm: RsaHashedKeyGenParams | EcKeyGenParams | DhKeyGenParams, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKeyPair>;
     generateKey(algorithm: AesKeyGenParams | HmacKeyGenParams | Pbkdf2Params, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKey>;
-    importKey(format: "jwk", keyData: JsonWebKey, algorithm: string | RsaHashedImportParams | EcKeyImportParams | HmacImportParams | DhImportKeyParams, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKey>;
-    importKey(format: "raw" | "pkcs8" | "spki", keyData: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer, algorithm: string | RsaHashedImportParams | EcKeyImportParams | HmacImportParams | DhImportKeyParams, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKey>;
-    importKey(format: string, keyData: JsonWebKey | Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer, algorithm: string | RsaHashedImportParams | EcKeyImportParams | HmacImportParams | DhImportKeyParams, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKey>;
+    importKey(format: "jwk", keyData: JsonWebKey, algorithm: string | RsaHashedImportParams | EcKeyImportParams | HmacImportParams | DhImportKeyParams | AesKeyAlgorithm, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKey>;
+    importKey(format: "raw" | "pkcs8" | "spki", keyData: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer, algorithm: string | RsaHashedImportParams | EcKeyImportParams | HmacImportParams | DhImportKeyParams | AesKeyAlgorithm, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKey>;
+    importKey(format: string, keyData: JsonWebKey | Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer, algorithm: string | RsaHashedImportParams | EcKeyImportParams | HmacImportParams | DhImportKeyParams | AesKeyAlgorithm, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKey>;
     sign(algorithm: string | RsaPssParams | EcdsaParams | AesCmacParams, key: CryptoKey, data: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer): PromiseLike<ArrayBuffer>;
     unwrapKey(format: string, wrappedKey: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer, unwrappingKey: CryptoKey, unwrapAlgorithm: string | Algorithm, unwrappedKeyAlgorithm: string | Algorithm, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKey>;
     verify(algorithm: string | RsaPssParams | EcdsaParams | AesCmacParams, key: CryptoKey, signature: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer, data: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer): PromiseLike<boolean>;
@@ -13120,10 +14262,33 @@ declare var Text: {
 };
 
 interface TextDecoder {
+    /**
+     * Returns encoding's name, lowercased.
+     */
     readonly encoding: string;
+    /**
+     * Returns true if error mode is "fatal", and false
+     * otherwise.
+     */
     readonly fatal: boolean;
+    /**
+     * Returns true if ignore BOM flag is set, and false otherwise.
+     */
     readonly ignoreBOM: boolean;
-    decode(input?: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null, options?: TextDecodeOptions): string;
+    /**
+     * Returns the result of running encoding's decoder. The
+     * method can be invoked zero or more times with options's stream set to
+     * true, and then once without options's stream (or set to false), to process
+     * a fragmented stream. If the invocation without options's stream (or set to
+     * false) has no input, it's clearest to omit both arguments.
+     * var string = "", decoder = new TextDecoder(encoding), buffer;
+     * while(buffer = next_chunk()) {
+     * string += decoder.decode(buffer, {stream:true});
+     * }
+     * string += decoder.decode(); // end-of-stream
+     * If the error mode is "fatal" and encoding's decoder returns error, throws a TypeError.
+     */
+    decode(input?: BufferSource, options?: TextDecodeOptions): string;
 }
 
 declare var TextDecoder: {
@@ -13132,7 +14297,13 @@ declare var TextDecoder: {
 };
 
 interface TextEncoder {
+    /**
+     * Returns "utf-8".
+     */
     readonly encoding: string;
+    /**
+     * Returns the result of running UTF-8's encoder.
+     */
     encode(input?: string): Uint8Array;
 }
 
@@ -13295,46 +14466,43 @@ declare var TimeRanges: {
 };
 
 interface Touch {
+    readonly altitudeAngle: number;
+    readonly azimuthAngle: number;
     readonly clientX: number;
     readonly clientY: number;
+    readonly force: number;
     readonly identifier: number;
     readonly pageX: number;
     readonly pageY: number;
+    readonly radiusX: number;
+    readonly radiusY: number;
+    readonly rotationAngle: number;
     readonly screenX: number;
     readonly screenY: number;
     readonly target: EventTarget;
+    readonly touchType: TouchType;
 }
 
 declare var Touch: {
     prototype: Touch;
-    new(): Touch;
+    new(touchInitDict: TouchInit): Touch;
 };
 
 interface TouchEvent extends UIEvent {
     readonly altKey: boolean;
     readonly changedTouches: TouchList;
-    readonly charCode: number;
     readonly ctrlKey: boolean;
-    readonly keyCode: number;
     readonly metaKey: boolean;
     readonly shiftKey: boolean;
     readonly targetTouches: TouchList;
     readonly touches: TouchList;
-    /** @deprecated */
-    readonly which: number;
 }
 
 declare var TouchEvent: {
     prototype: TouchEvent;
-    new(type: string, touchEventInit?: TouchEventInit): TouchEvent;
+    new(type: string, eventInitDict?: TouchEventInit): TouchEvent;
 };
 
-interface TouchEventInit extends EventModifierInit {
-    changedTouches?: Touch[];
-    targetTouches?: Touch[];
-    touches?: Touch[];
-}
-
 interface TouchList {
     readonly length: number;
     item(index: number): Touch | null;
@@ -13358,12 +14526,12 @@ declare var TrackEvent: {
 interface TransitionEvent extends Event {
     readonly elapsedTime: number;
     readonly propertyName: string;
-    initTransitionEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, propertyNameArg: string, elapsedTimeArg: number): void;
+    readonly pseudoElement: string;
 }
 
 declare var TransitionEvent: {
     prototype: TransitionEvent;
-    new(typeArg: string, eventInitDict?: TransitionEventInit): TransitionEvent;
+    new(type: string, transitionEventInitDict?: TransitionEventInit): TransitionEvent;
 };
 
 interface TreeWalker {
@@ -13411,16 +14579,19 @@ interface URL {
     search: string;
     readonly searchParams: URLSearchParams;
     username: string;
-    toString(): string;
+    toJSON(): string;
 }
 
 declare var URL: {
     prototype: URL;
     new(url: string, base?: string | URL): URL;
-    createObjectURL(object: any, options?: ObjectURLOptions): string;
+    createObjectURL(object: any): string;
     revokeObjectURL(url: string): void;
 };
 
+type webkitURL = URL;
+declare var webkitURL: typeof URL;
+
 interface URLSearchParams {
     /**
      * Appends a specified key/value pair as a new search parameter.
@@ -13446,11 +14617,13 @@ interface URLSearchParams {
      * Sets the value associated to a given search parameter to the given value. If there were several values, delete the others.
      */
     set(name: string, value: string): void;
+    sort(): void;
+    forEach(callbackfn: (value: string, key: string, parent: URLSearchParams) => void, thisArg?: any): void;
 }
 
 declare var URLSearchParams: {
     prototype: URLSearchParams;
-    new (init?: string | URLSearchParams): URLSearchParams;
+    new(init?: string[][] | Record<string, string> | string | URLSearchParams): URLSearchParams;
 };
 
 interface VRDisplay extends EventTarget {
@@ -13767,7 +14940,7 @@ interface WaveShaperNode extends AudioNode {
 
 declare var WaveShaperNode: {
     prototype: WaveShaperNode;
-    new(): WaveShaperNode;
+    new(context: BaseAudioContext, options?: WaveShaperOptions): WaveShaperNode;
 };
 
 interface WebAuthentication {
@@ -14655,96 +15828,6 @@ declare var WebGLUniformLocation: {
 interface WebGLVertexArrayObjectOES {
 }
 
-interface WebKitCSSMatrix {
-    a: number;
-    b: number;
-    c: number;
-    d: number;
-    e: number;
-    f: number;
-    m11: number;
-    m12: number;
-    m13: number;
-    m14: number;
-    m21: number;
-    m22: number;
-    m23: number;
-    m24: number;
-    m31: number;
-    m32: number;
-    m33: number;
-    m34: number;
-    m41: number;
-    m42: number;
-    m43: number;
-    m44: number;
-    inverse(): WebKitCSSMatrix;
-    multiply(secondMatrix: WebKitCSSMatrix): WebKitCSSMatrix;
-    rotate(angleX: number, angleY?: number, angleZ?: number): WebKitCSSMatrix;
-    rotateAxisAngle(x: number, y: number, z: number, angle: number): WebKitCSSMatrix;
-    scale(scaleX: number, scaleY?: number, scaleZ?: number): WebKitCSSMatrix;
-    setMatrixValue(value: string): void;
-    skewX(angle: number): WebKitCSSMatrix;
-    skewY(angle: number): WebKitCSSMatrix;
-    toString(): string;
-    translate(x: number, y: number, z?: number): WebKitCSSMatrix;
-}
-
-declare var WebKitCSSMatrix: {
-    prototype: WebKitCSSMatrix;
-    new(text?: string): WebKitCSSMatrix;
-};
-
-interface WebKitDirectoryEntry extends WebKitEntry {
-    createReader(): WebKitDirectoryReader;
-}
-
-declare var WebKitDirectoryEntry: {
-    prototype: WebKitDirectoryEntry;
-    new(): WebKitDirectoryEntry;
-};
-
-interface WebKitDirectoryReader {
-    readEntries(successCallback: WebKitEntriesCallback, errorCallback?: WebKitErrorCallback): void;
-}
-
-declare var WebKitDirectoryReader: {
-    prototype: WebKitDirectoryReader;
-    new(): WebKitDirectoryReader;
-};
-
-interface WebKitEntry {
-    readonly filesystem: WebKitFileSystem;
-    readonly fullPath: string;
-    readonly isDirectory: boolean;
-    readonly isFile: boolean;
-    readonly name: string;
-}
-
-declare var WebKitEntry: {
-    prototype: WebKitEntry;
-    new(): WebKitEntry;
-};
-
-interface WebKitFileEntry extends WebKitEntry {
-    file(successCallback: WebKitFileCallback, errorCallback?: WebKitErrorCallback): void;
-}
-
-declare var WebKitFileEntry: {
-    prototype: WebKitFileEntry;
-    new(): WebKitFileEntry;
-};
-
-interface WebKitFileSystem {
-    readonly name: string;
-    readonly root: WebKitDirectoryEntry;
-}
-
-declare var WebKitFileSystem: {
-    prototype: WebKitFileSystem;
-    new(): WebKitFileSystem;
-};
-
 interface WebKitPoint {
     x: number;
     y: number;
@@ -14902,10 +15985,6 @@ interface WindowEventMap extends GlobalEventHandlersEventMap {
     "submit": Event;
     "suspend": Event;
     "timeupdate": Event;
-    "touchcancel": TouchEvent;
-    "touchend": TouchEvent;
-    "touchmove": TouchEvent;
-    "touchstart": TouchEvent;
     "unload": Event;
     "volumechange": Event;
     "vrdisplayactivate": Event;
@@ -14935,6 +16014,7 @@ interface Window extends EventTarget, WindowTimers, WindowSessionStorage, Window
     readonly doNotTrack: string;
     readonly document: Document;
     event: Event | undefined;
+    /** @deprecated */
     readonly external: External;
     readonly frameElement: Element;
     readonly frames: Window;
@@ -15035,10 +16115,6 @@ interface Window extends EventTarget, WindowTimers, WindowSessionStorage, Window
     onsubmit: ((this: Window, ev: Event) => any) | null;
     onsuspend: ((this: Window, ev: Event) => any) | null;
     ontimeupdate: ((this: Window, ev: Event) => any) | null;
-    ontouchcancel: (ev: TouchEvent) => any;
-    ontouchend: (ev: TouchEvent) => any;
-    ontouchmove: (ev: TouchEvent) => any;
-    ontouchstart: (ev: TouchEvent) => any;
     onunload: ((this: Window, ev: Event) => any) | null;
     onvolumechange: ((this: Window, ev: Event) => any) | null;
     onvrdisplayactivate: ((this: Window, ev: Event) => any) | null;
@@ -15079,6 +16155,7 @@ interface Window extends EventTarget, WindowTimers, WindowSessionStorage, Window
     alert(message?: any): void;
     blur(): void;
     cancelAnimationFrame(handle: number): void;
+    /** @deprecated */
     captureEvents(): void;
     close(): void;
     confirm(message?: string): boolean;
@@ -15097,6 +16174,7 @@ interface Window extends EventTarget, WindowTimers, WindowSessionStorage, Window
     postMessage(message: any, targetOrigin: string, transfer?: any[]): void;
     print(): void;
     prompt(message?: string, _default?: string): string | null;
+    /** @deprecated */
     releaseEvents(): void;
     requestAnimationFrame(callback: FrameRequestCallback): number;
     resizeBy(x?: number, y?: number): void;
@@ -15170,6 +16248,13 @@ interface WindowLocalStorage {
     readonly localStorage: Storage;
 }
 
+interface WindowOrWorkerGlobalScope {
+    readonly caches: CacheStorage;
+    readonly indexedDB: IDBFactory;
+    readonly performance: Performance;
+    fetch(input: RequestInfo, init?: RequestInit): Promise<Response>;
+}
+
 interface WindowSessionStorage {
     readonly sessionStorage: Storage;
 }
@@ -15195,7 +16280,6 @@ interface WorkerEventMap extends AbstractWorkerEventMap {
 
 interface Worker extends EventTarget, AbstractWorker {
     onmessage: ((this: Worker, ev: MessageEvent) => any) | null;
-    /** @deprecated */
     postMessage(message: any, transfer?: any[]): void;
     terminate(): void;
     addEventListener<K extends keyof WorkerEventMap>(type: K, listener: (this: Worker, ev: WorkerEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
@@ -15209,6 +16293,15 @@ declare var Worker: {
     new(stringUrl: string): Worker;
 };
 
+interface Worklet {
+    addModule(moduleURL: string, options?: WorkletOptions): Promise<void>;
+}
+
+declare var Worklet: {
+    prototype: Worklet;
+    new(): Worklet;
+};
+
 interface WritableStream {
     readonly locked: boolean;
     abort(reason?: any): Promise<void>;
@@ -15260,28 +16353,96 @@ interface XMLHttpRequestEventMap extends XMLHttpRequestEventTargetEventMap {
     "readystatechange": Event;
 }
 
-interface XMLHttpRequest extends EventTarget, XMLHttpRequestEventTarget {
-    msCaching: string;
+interface XMLHttpRequest extends XMLHttpRequestEventTarget {
     onreadystatechange: ((this: XMLHttpRequest, ev: Event) => any) | null;
+    /**
+     * Returns client's state.
+     */
     readonly readyState: number;
+    /**
+     * Returns the response's body.
+     */
     readonly response: any;
+    /**
+     * Returns the text response.
+     * Throws an "InvalidStateError" DOMException if responseType is not the empty string or "text".
+     */
     readonly responseText: string;
+    /**
+     * Returns the response type.
+     * Can be set to change the response type. Values are:
+     * the empty string (default),
+     * "arraybuffer",
+     * "blob",
+     * "document",
+     * "json", and
+     * "text".
+     * When set: setting to "document" is ignored if current global object is not a Window object.
+     * When set: throws an "InvalidStateError" DOMException if state is loading or done.
+     * When set: throws an "InvalidAccessError" DOMException if the synchronous flag is set and current global object is a Window object.
+     */
     responseType: XMLHttpRequestResponseType;
     readonly responseURL: string;
+    /**
+     * Returns the document response.
+     * Throws an "InvalidStateError" DOMException if responseType is not the empty string or "document".
+     */
     readonly responseXML: Document | null;
     readonly status: number;
     readonly statusText: string;
+    /**
+     * Can be set to a time in milliseconds. When set to a non-zero value will cause fetching to terminate after the given time has passed. When the time has passed, the
+     * request has not yet completed, and the synchronous flag is unset, a timeout event will then be dispatched, or a
+     * "TimeoutError" DOMException will be thrown otherwise (for the send() method).
+     * When set: throws an "InvalidAccessError" DOMException if the synchronous flag is set and current global object is a Window object.
+     */
     timeout: number;
+    /**
+     * Returns the associated XMLHttpRequestUpload object. It can be used to gather transmission information when data is
+     * transferred to a server.
+     */
     readonly upload: XMLHttpRequestUpload;
+    /**
+     * True when credentials are to be included in a cross-origin request. False when they are
+     * to be excluded in a cross-origin request and when cookies are to be ignored in its response.
+     * Initially false.
+     * When set: throws an "InvalidStateError" DOMException if state is not unsent or opened, or if the send() flag is set.
+     */
     withCredentials: boolean;
+    /**
+     * Cancels any network activity.
+     */
     abort(): void;
     getAllResponseHeaders(): string;
-    getResponseHeader(header: string): string | null;
-    msCachingEnabled(): boolean;
-    open(method: string, url: string, async?: boolean, user?: string | null, password?: string | null): void;
+    getResponseHeader(name: string): string | null;
+    /**
+     * Sets the request method, request URL, and synchronous flag.
+     * Throws a "SyntaxError" DOMException if either method is not a
+     * valid HTTP method or url cannot be parsed.
+     * Throws a "SecurityError" DOMException if method is a
+     * case-insensitive match for `CONNECT`, `TRACE`, or `TRACK`.
+     * Throws an "InvalidAccessError" DOMException if async is false, current global object is a Window object, and the timeout attribute is not zero or the responseType attribute is not the empty string.
+     */
+    open(method: string, url: string): void;
+    open(method: string, url: string, async: boolean, username?: string | null, password?: string | null): void;
+    /**
+     * Acts as if the `Content-Type` header value for response is mime.
+     * (It does not actually change the header though.)
+     * Throws an "InvalidStateError" DOMException if state is loading or done.
+     */
     overrideMimeType(mime: string): void;
-    send(data?: any): void;
-    setRequestHeader(header: string, value: string): void;
+    /**
+     * Initiates the request. The optional argument provides the request body. The argument is ignored if request method is GET or HEAD.
+     * Throws an "InvalidStateError" DOMException if either state is not opened or the send() flag is set.
+     */
+    send(body?: Document | BodyInit): void;
+    /**
+     * Combines a header in author request headers.
+     * Throws an "InvalidStateError" DOMException if either state is not opened or the send() flag is set.
+     * Throws a "SyntaxError" DOMException if name is not a header name
+     * or if value is not a header value.
+     */
+    setRequestHeader(name: string, value: string): void;
     readonly DONE: number;
     readonly HEADERS_RECEIVED: number;
     readonly LOADING: number;
@@ -15304,21 +16465,21 @@ declare var XMLHttpRequest: {
 };
 
 interface XMLHttpRequestEventTargetEventMap {
-    "abort": Event;
-    "error": ErrorEvent;
-    "load": Event;
+    "abort": ProgressEvent;
+    "error": ProgressEvent;
+    "load": ProgressEvent;
     "loadend": ProgressEvent;
-    "loadstart": Event;
+    "loadstart": ProgressEvent;
     "progress": ProgressEvent;
     "timeout": ProgressEvent;
 }
 
-interface XMLHttpRequestEventTarget {
-    onabort: ((this: XMLHttpRequest, ev: Event) => any) | null;
-    onerror: ((this: XMLHttpRequest, ev: ErrorEvent) => any) | null;
-    onload: ((this: XMLHttpRequest, ev: Event) => any) | null;
+interface XMLHttpRequestEventTarget extends EventTarget {
+    onabort: ((this: XMLHttpRequest, ev: ProgressEvent) => any) | null;
+    onerror: ((this: XMLHttpRequest, ev: ProgressEvent) => any) | null;
+    onload: ((this: XMLHttpRequest, ev: ProgressEvent) => any) | null;
     onloadend: ((this: XMLHttpRequest, ev: ProgressEvent) => any) | null;
-    onloadstart: ((this: XMLHttpRequest, ev: Event) => any) | null;
+    onloadstart: ((this: XMLHttpRequest, ev: ProgressEvent) => any) | null;
     onprogress: ((this: XMLHttpRequest, ev: ProgressEvent) => any) | null;
     ontimeout: ((this: XMLHttpRequest, ev: ProgressEvent) => any) | null;
     addEventListener<K extends keyof XMLHttpRequestEventTargetEventMap>(type: K, listener: (this: XMLHttpRequestEventTarget, ev: XMLHttpRequestEventTargetEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
@@ -15327,7 +16488,12 @@ interface XMLHttpRequestEventTarget {
     removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
 }
 
-interface XMLHttpRequestUpload extends EventTarget, XMLHttpRequestEventTarget {
+declare var XMLHttpRequestEventTarget: {
+    prototype: XMLHttpRequestEventTarget;
+    new(): XMLHttpRequestEventTarget;
+};
+
+interface XMLHttpRequestUpload extends XMLHttpRequestEventTarget {
     addEventListener<K extends keyof XMLHttpRequestEventTargetEventMap>(type: K, listener: (this: XMLHttpRequestUpload, ev: XMLHttpRequestEventTargetEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
     addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
     removeEventListener<K extends keyof XMLHttpRequestEventTargetEventMap>(type: K, listener: (this: XMLHttpRequestUpload, ev: XMLHttpRequestEventTargetEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
@@ -15472,6 +16638,10 @@ interface FunctionStringCallback {
     (data: string): void;
 }
 
+interface GenerateAssertionCallback {
+    (contents: string, origin: string, options: RTCIdentityProviderOptions): Promise<RTCIdentityAssertionResult>;
+}
+
 interface IntersectionObserverCallback {
     (entries: IntersectionObserverEntry[], observer: IntersectionObserver): void;
 }
@@ -15500,26 +16670,34 @@ interface NotificationPermissionCallback {
     (permission: NotificationPermission): void;
 }
 
+interface PerformanceObserverCallback {
+    (entries: PerformanceObserverEntryList, observer: PerformanceObserver): void;
+}
+
 interface PositionCallback {
     (position: Position): void;
 }
 
 interface PositionErrorCallback {
-    (error: PositionError): void;
+    (positionError: PositionError): void;
 }
 
 interface RTCPeerConnectionErrorCallback {
-    (error: DOMError): void;
+    (error: DOMException): void;
 }
 
 interface RTCSessionDescriptionCallback {
-    (sdp: RTCSessionDescription): void;
+    (description: RTCSessionDescriptionInit): void;
 }
 
 interface RTCStatsCallback {
     (report: RTCStatsReport): void;
 }
 
+interface ValidateAssertionCallback {
+    (assertion: string, origin: string): Promise<RTCIdentityValidationResult>;
+}
+
 interface VoidFunction {
     (): void;
 }
@@ -15667,40 +16845,40 @@ interface HTMLElementTagNameMap {
 
 interface SVGElementTagNameMap {
     "circle": SVGCircleElement;
-    "clippath": SVGClipPathElement;
+    "clipPath": SVGClipPathElement;
     "defs": SVGDefsElement;
     "desc": SVGDescElement;
     "ellipse": SVGEllipseElement;
-    "feblend": SVGFEBlendElement;
-    "fecolormatrix": SVGFEColorMatrixElement;
-    "fecomponenttransfer": SVGFEComponentTransferElement;
-    "fecomposite": SVGFECompositeElement;
-    "feconvolvematrix": SVGFEConvolveMatrixElement;
-    "fediffuselighting": SVGFEDiffuseLightingElement;
-    "fedisplacementmap": SVGFEDisplacementMapElement;
-    "fedistantlight": SVGFEDistantLightElement;
-    "feflood": SVGFEFloodElement;
-    "fefunca": SVGFEFuncAElement;
-    "fefuncb": SVGFEFuncBElement;
-    "fefuncg": SVGFEFuncGElement;
-    "fefuncr": SVGFEFuncRElement;
-    "fegaussianblur": SVGFEGaussianBlurElement;
-    "feimage": SVGFEImageElement;
-    "femerge": SVGFEMergeElement;
-    "femergenode": SVGFEMergeNodeElement;
-    "femorphology": SVGFEMorphologyElement;
-    "feoffset": SVGFEOffsetElement;
-    "fepointlight": SVGFEPointLightElement;
-    "fespecularlighting": SVGFESpecularLightingElement;
-    "fespotlight": SVGFESpotLightElement;
-    "fetile": SVGFETileElement;
-    "feturbulence": SVGFETurbulenceElement;
+    "feBlend": SVGFEBlendElement;
+    "feColorMatrix": SVGFEColorMatrixElement;
+    "feComponentTransfer": SVGFEComponentTransferElement;
+    "feComposite": SVGFECompositeElement;
+    "feConvolveMatrix": SVGFEConvolveMatrixElement;
+    "feDiffuseLighting": SVGFEDiffuseLightingElement;
+    "feDisplacementMap": SVGFEDisplacementMapElement;
+    "feDistantLight": SVGFEDistantLightElement;
+    "feFlood": SVGFEFloodElement;
+    "feFuncA": SVGFEFuncAElement;
+    "feFuncB": SVGFEFuncBElement;
+    "feFuncG": SVGFEFuncGElement;
+    "feFuncR": SVGFEFuncRElement;
+    "feGaussianBlur": SVGFEGaussianBlurElement;
+    "feImage": SVGFEImageElement;
+    "feMerge": SVGFEMergeElement;
+    "feMergeNode": SVGFEMergeNodeElement;
+    "feMorphology": SVGFEMorphologyElement;
+    "feOffset": SVGFEOffsetElement;
+    "fePointLight": SVGFEPointLightElement;
+    "feSpecularLighting": SVGFESpecularLightingElement;
+    "feSpotLight": SVGFESpotLightElement;
+    "feTile": SVGFETileElement;
+    "feTurbulence": SVGFETurbulenceElement;
     "filter": SVGFilterElement;
-    "foreignobject": SVGForeignObjectElement;
+    "foreignObject": SVGForeignObjectElement;
     "g": SVGGElement;
     "image": SVGImageElement;
     "line": SVGLineElement;
-    "lineargradient": SVGLinearGradientElement;
+    "linearGradient": SVGLinearGradientElement;
     "marker": SVGMarkerElement;
     "mask": SVGMaskElement;
     "metadata": SVGMetadataElement;
@@ -15708,14 +16886,14 @@ interface SVGElementTagNameMap {
     "pattern": SVGPatternElement;
     "polygon": SVGPolygonElement;
     "polyline": SVGPolylineElement;
-    "radialgradient": SVGRadialGradientElement;
+    "radialGradient": SVGRadialGradientElement;
     "rect": SVGRectElement;
     "stop": SVGStopElement;
     "svg": SVGSVGElement;
     "switch": SVGSwitchElement;
     "symbol": SVGSymbolElement;
     "text": SVGTextElement;
-    "textpath": SVGTextPathElement;
+    "textPath": SVGTextPathElement;
     "tspan": SVGTSpanElement;
     "use": SVGUseElement;
     "view": SVGViewElement;
@@ -15747,6 +16925,7 @@ declare var devicePixelRatio: number;
 declare var doNotTrack: string;
 declare var document: Document;
 declare var event: Event | undefined;
+/** @deprecated */
 declare var external: External;
 declare var frameElement: Element;
 declare var frames: Window;
@@ -15847,10 +17026,6 @@ declare var onstorage: ((this: Window, ev: StorageEvent) => any) | null;
 declare var onsubmit: ((this: Window, ev: Event) => any) | null;
 declare var onsuspend: ((this: Window, ev: Event) => any) | null;
 declare var ontimeupdate: ((this: Window, ev: Event) => any) | null;
-declare var ontouchcancel: (ev: TouchEvent) => any;
-declare var ontouchend: (ev: TouchEvent) => any;
-declare var ontouchmove: (ev: TouchEvent) => any;
-declare var ontouchstart: (ev: TouchEvent) => any;
 declare var onunload: ((this: Window, ev: Event) => any) | null;
 declare var onvolumechange: ((this: Window, ev: Event) => any) | null;
 declare var onvrdisplayactivate: ((this: Window, ev: Event) => any) | null;
@@ -15891,6 +17066,7 @@ declare var window: Window;
 declare function alert(message?: any): void;
 declare function blur(): void;
 declare function cancelAnimationFrame(handle: number): void;
+/** @deprecated */
 declare function captureEvents(): void;
 declare function close(): void;
 declare function confirm(message?: string): boolean;
@@ -15909,6 +17085,7 @@ declare function open(url?: string, target?: string, features?: string, replace?
 declare function postMessage(message: any, targetOrigin: string, transfer?: any[]): void;
 declare function print(): void;
 declare function prompt(message?: string, _default?: string): string | null;
+/** @deprecated */
 declare function releaseEvents(): void;
 declare function requestAnimationFrame(callback: FrameRequestCallback): number;
 declare function resizeBy(x?: number, y?: number): void;
@@ -15938,6 +17115,12 @@ declare function setImmediate(handler: any, ...args: any[]): number;
 declare var sessionStorage: Storage;
 declare var localStorage: Storage;
 declare var console: Console;
+declare var onanimationcancel: ((this: Window, ev: AnimationEvent) => any) | null;
+declare var onanimationend: ((this: Window, ev: AnimationEvent) => any) | null;
+declare var onanimationiteration: ((this: Window, ev: AnimationEvent) => any) | null;
+declare var onanimationstart: ((this: Window, ev: AnimationEvent) => any) | null;
+declare var ongotpointercapture: ((this: Window, ev: PointerEvent) => any) | null;
+declare var onlostpointercapture: ((this: Window, ev: PointerEvent) => any) | null;
 declare var onpointercancel: ((this: Window, ev: PointerEvent) => any) | null;
 declare var onpointerdown: ((this: Window, ev: PointerEvent) => any) | null;
 declare var onpointerenter: ((this: Window, ev: PointerEvent) => any) | null;
@@ -15946,28 +17129,46 @@ declare var onpointermove: ((this: Window, ev: PointerEvent) => any) | null;
 declare var onpointerout: ((this: Window, ev: PointerEvent) => any) | null;
 declare var onpointerover: ((this: Window, ev: PointerEvent) => any) | null;
 declare var onpointerup: ((this: Window, ev: PointerEvent) => any) | null;
+declare var ontouchcancel: ((this: Window, ev: TouchEvent) => any) | null;
+declare var ontouchend: ((this: Window, ev: TouchEvent) => any) | null;
+declare var ontouchmove: ((this: Window, ev: TouchEvent) => any) | null;
+declare var ontouchstart: ((this: Window, ev: TouchEvent) => any) | null;
+declare var ontransitioncancel: ((this: Window, ev: TransitionEvent) => any) | null;
+declare var ontransitionend: ((this: Window, ev: TransitionEvent) => any) | null;
+declare var ontransitionrun: ((this: Window, ev: TransitionEvent) => any) | null;
+declare var ontransitionstart: ((this: Window, ev: TransitionEvent) => any) | null;
 declare var onwheel: ((this: Window, ev: WheelEvent) => any) | null;
 declare var indexedDB: IDBFactory;
 declare function atob(encodedString: string): string;
 declare function btoa(rawString: string): string;
 declare function fetch(input?: Request | string, init?: RequestInit): Promise<Response>;
+declare var sessionStorage: Storage;
+declare var localStorage: Storage;
 declare function addEventListener<K extends keyof WindowEventMap>(type: K, listener: (this: Window, ev: WindowEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
 declare function addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
 declare function removeEventListener<K extends keyof WindowEventMap>(type: K, listener: (this: Window, ev: WindowEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
 declare function removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
+type BlobPart = BufferSource | Blob | string;
+type HeadersInit = Headers | string[][] | Record<string, string>;
+type BodyInit = Blob | BufferSource | FormData | URLSearchParams | ReadableStream | string;
+type RequestInfo = Request | string;
+type DOMHighResTimeStamp = number;
+type PerformanceEntryList = PerformanceEntry[];
+type PushMessageDataInit = BufferSource | string;
+type VibratePattern = number | number[];
+type BufferSource = ArrayBufferView | ArrayBuffer;
+type DOMTimeStamp = number;
+type FormDataEntryValue = File | string;
 type ScrollBehavior = "auto" | "instant" | "smooth";
 type ScrollLogicalPosition = "start" | "center" | "end" | "nearest";
 type MouseWheelEvent = WheelEvent;
 type ScrollRestoration = "auto" | "manual";
-type FormDataEntryValue = string | File;
 type InsertPosition = "beforebegin" | "afterbegin" | "beforeend" | "afterend";
-type HeadersInit = Headers | string[][] | { [key: string]: string };
 type OrientationLockType = "any" | "natural" | "portrait" | "landscape" | "portrait-primary" | "portrait-secondary" | "landscape-primary"| "landscape-secondary";
-type IDBValidKey = number | string | Date | IDBArrayKey;
+type IDBValidKey = number | string | Date | BufferSource | IDBArrayKey;
 type AlgorithmIdentifier = string | Algorithm;
 type MutationRecordType = "attributes" | "characterData" | "childList";
 type AAGUID = string;
-type BodyInit = any;
 type ByteString = string;
 type ConstrainBoolean = boolean | ConstrainBooleanParameters;
 type ConstrainDOMString = string | string[] | ConstrainDOMStringParameters;
@@ -15994,25 +17195,28 @@ type MSLocalClientEvent = MSLocalClientEventBase | MSAudioLocalClientEvent;
 type MSOutboundPayload = MSVideoSendPayload | MSAudioSendPayload;
 type RTCIceGatherCandidate = RTCIceCandidateDictionary | RTCIceCandidateComplete;
 type RTCTransport = RTCDtlsTransport | RTCSrtpSdesTransport;
-type RequestInfo = Request | string;
 type USVString = string;
 type payloadtype = number;
-type BufferSource = ArrayBuffer | ArrayBufferView;
-type ClientTypes = "window" | "worker" | "sharedworker" | "all";
+type MessageEventSource = Window | MessagePort | ServiceWorker;
+type AnimationPlayState = "idle" | "running" | "paused" | "finished";
 type AppendMode = "segments" | "sequence";
 type AudioContextLatencyCategory = "balanced" | "interactive" | "playback";
 type AudioContextState = "suspended" | "running" | "closed";
+type AutomationRate = "a-rate" | "k-rate";
 type BinaryType = "blob" | "arraybuffer";
 type BiquadFilterType = "lowpass" | "highpass" | "bandpass" | "lowshelf" | "highshelf" | "peaking" | "notch" | "allpass";
 type CanPlayTypeResult = "" | "maybe" | "probably";
 type CanvasFillRule = "nonzero" | "evenodd";
 type ChannelCountMode = "max" | "clamped-max" | "explicit";
 type ChannelInterpretation = "speakers" | "discrete";
+type ClientTypes = "window" | "worker" | "sharedworker" | "all";
+type CompositeOperation = "replace" | "add" | "accumulate";
 type DisplayCaptureSurfaceType = "monitor" | "window" | "application" | "browser";
 type DistanceModelType = "linear" | "inverse" | "exponential";
 type DocumentReadyState = "loading" | "interactive" | "complete";
 type EndOfStreamError = "network" | "decode";
 type ExpandGranularity = "character" | "word" | "sentence" | "textedit";
+type FillMode = "none" | "forwards" | "backwards" | "both" | "auto";
 type GamepadHand = "" | "left" | "right";
 type GamepadHapticActuatorType = "vibration";
 type GamepadInputEmulationType = "mouse" | "keyboard" | "gamepad";
@@ -16020,6 +17224,7 @@ type GamepadMappingType = "" | "standard";
 type IDBCursorDirection = "next" | "nextunique" | "prev" | "prevunique";
 type IDBRequestReadyState = "pending" | "done";
 type IDBTransactionMode = "readonly" | "readwrite" | "versionchange";
+type IterationCompositeOperation = "replace" | "accumulate";
 type KeyFormat = "raw" | "spki" | "pkcs8" | "jwk";
 type KeyType = "public" | "private" | "secret";
 type KeyUsage = "encrypt" | "decrypt" | "sign" | "verify" | "deriveKey" | "deriveBits" | "wrapKey" | "unwrapKey";
@@ -16046,44 +17251,57 @@ type OverSampleType = "none" | "2x" | "4x";
 type PanningModelType = "equalpower" | "HRTF";
 type PaymentComplete = "success" | "fail" | "unknown";
 type PaymentShippingType = "shipping" | "delivery" | "pickup";
+type PlaybackDirection = "normal" | "reverse" | "alternate" | "alternate-reverse";
 type PushEncryptionKeyName = "p256dh" | "auth";
-type PushPermissionState = "granted" | "denied" | "prompt";
+type PushPermissionState = "denied" | "granted" | "prompt";
 type RTCBundlePolicy = "balanced" | "max-compat" | "max-bundle";
+type RTCDataChannelState = "connecting" | "open" | "closing" | "closed";
 type RTCDegradationPreference = "maintain-framerate" | "maintain-resolution" | "balanced";
 type RTCDtlsRole = "auto" | "client" | "server";
-type RTCDtlsTransportState = "new" | "connecting" | "connected" | "closed";
+type RTCDtlsTransportState = "new" | "connecting" | "connected" | "closed" | "failed";
+type RTCDtxStatus = "disabled" | "enabled";
+type RTCErrorDetailType = "data-channel-failure" | "dtls-failure" | "fingerprint-failure" | "idp-bad-script-failure" | "idp-execution-failure" | "idp-load-failure" | "idp-need-login" | "idp-timeout" | "idp-tls-failure" | "idp-token-expired" | "idp-token-invalid" | "sctp-failure" | "sdp-syntax-error" | "hardware-encoder-not-available" | "hardware-encoder-error";
 type RTCIceCandidateType = "host" | "srflx" | "prflx" | "relay";
-type RTCIceComponent = "RTP" | "RTCP";
-type RTCIceConnectionState = "new" | "checking" | "connected" | "completed" | "failed" | "disconnected" | "closed";
+type RTCIceComponent = "rtp" | "rtcp";
+type RTCIceConnectionState = "new" | "checking" | "connected" | "completed" | "disconnected" | "failed" | "closed";
+type RTCIceCredentialType = "password" | "oauth";
 type RTCIceGatherPolicy = "all" | "nohost" | "relay";
 type RTCIceGathererState = "new" | "gathering" | "complete";
 type RTCIceGatheringState = "new" | "gathering" | "complete";
 type RTCIceProtocol = "udp" | "tcp";
 type RTCIceRole = "controlling" | "controlled";
 type RTCIceTcpCandidateType = "active" | "passive" | "so";
-type RTCIceTransportPolicy = "none" | "relay" | "all";
-type RTCIceTransportState = "new" | "checking" | "connected" | "completed" | "disconnected" | "closed";
-type RTCSdpType = "offer" | "pranswer" | "answer";
+type RTCIceTransportPolicy = "relay" | "all";
+type RTCIceTransportState = "new" | "checking" | "connected" | "completed" | "disconnected" | "failed" | "closed";
+type RTCPeerConnectionState = "new" | "connecting" | "connected" | "disconnected" | "failed" | "closed";
+type RTCPriorityType = "very-low" | "low" | "medium" | "high";
+type RTCRtcpMuxPolicy = "negotiate" | "require";
+type RTCRtpTransceiverDirection = "sendrecv" | "sendonly" | "recvonly" | "inactive";
+type RTCSctpTransportState = "new" | "connecting" | "connected" | "closed";
+type RTCSdpType = "offer" | "pranswer" | "answer" | "rollback";
 type RTCSignalingState = "stable" | "have-local-offer" | "have-remote-offer" | "have-local-pranswer" | "have-remote-pranswer" | "closed";
 type RTCStatsIceCandidatePairState = "frozen" | "waiting" | "inprogress" | "failed" | "succeeded" | "cancelled";
 type RTCStatsIceCandidateType = "host" | "serverreflexive" | "peerreflexive" | "relayed";
 type RTCStatsType = "inboundrtp" | "outboundrtp" | "session" | "datachannel" | "track" | "transport" | "candidatepair" | "localcandidate" | "remotecandidate";
 type ReadyState = "closed" | "open" | "ended";
 type ReferrerPolicy = "" | "no-referrer" | "no-referrer-when-downgrade" | "origin-only" | "origin-when-cross-origin" | "unsafe-url";
-type RequestCache = "default" | "no-store" | "reload" | "no-cache" | "force-cache";
+type RequestCache = "default" | "no-store" | "reload" | "no-cache" | "force-cache" | "only-if-cached";
 type RequestCredentials = "omit" | "same-origin" | "include";
-type RequestDestination = "" | "document" | "sharedworker" | "subresource" | "unknown" | "worker";
+type RequestDestination = "" | "audio" | "audioworklet" | "document" | "embed" | "font" | "image" | "manifest" | "object" | "paintworklet" | "report" | "script" | "sharedworker" | "style" | "track" | "video" | "worker" | "xslt";
 type RequestMode = "navigate" | "same-origin" | "no-cors" | "cors";
 type RequestRedirect = "follow" | "error" | "manual";
-type RequestType = "" | "audio" | "font" | "image" | "script" | "style" | "track" | "video";
 type ResponseType = "basic" | "cors" | "default" | "error" | "opaque" | "opaqueredirect";
 type ScopedCredentialType = "ScopedCred";
+type SelectionMode = "select" | "start" | "end" | "preserve";
 type ServiceWorkerState = "installing" | "installed" | "activating" | "activated" | "redundant";
+type ServiceWorkerUpdateViaCache = "imports" | "all" | "none";
 type TextTrackKind = "subtitles" | "captions" | "descriptions" | "chapters" | "metadata";
 type TextTrackMode = "disabled" | "hidden" | "showing";
+type TouchType = "direct" | "stylus";
 type Transport = "usb" | "nfc" | "ble";
 type VRDisplayEventReason = "mounted" | "navigation" | "requested" | "unmounted";
 type VREye = "left" | "right";
 type VideoFacingModeEnum = "user" | "environment" | "left" | "right";
 type VisibilityState = "hidden" | "visible" | "prerender" | "unloaded";
+type WorkerType = "classic" | "module";
 type XMLHttpRequestResponseType = "" | "arraybuffer" | "blob" | "document" | "json" | "text";
\ No newline at end of file
diff --git a/lib/lib.dom.iterable.d.ts b/lib/lib.dom.iterable.d.ts
index 4914c210227..1c9c11caba1 100644
--- a/lib/lib.dom.iterable.d.ts
+++ b/lib/lib.dom.iterable.d.ts
@@ -18,12 +18,84 @@ and limitations under the License.
 /// <reference no-default-lib="true"/>
 
 
-/// <reference path="lib.dom.d.ts" />
+/////////////////////////////
+/// DOM Iterable APIs
+/////////////////////////////
+
+interface AudioParamMap extends ReadonlyMap<string, AudioParam> {
+}
+
+interface AudioTrackList {
+    [Symbol.iterator](): IterableIterator<AudioTrack>;
+}
+
+interface CSSRuleList {
+    [Symbol.iterator](): IterableIterator<CSSRule>;
+}
+
+interface CSSStyleDeclaration {
+    [Symbol.iterator](): IterableIterator<string>;
+}
+
+interface ClientRectList {
+    [Symbol.iterator](): IterableIterator<ClientRect>;
+}
+
+interface DOMRectList {
+    [Symbol.iterator](): IterableIterator<DOMRect>;
+}
+
+interface DOMStringList {
+    [Symbol.iterator](): IterableIterator<string>;
+}
 
 interface DOMTokenList {
     [Symbol.iterator](): IterableIterator<string>;
 }
 
+interface DataTransferItemList {
+    [Symbol.iterator](): IterableIterator<File>;
+}
+
+interface FileList {
+    [Symbol.iterator](): IterableIterator<File>;
+}
+
+interface FormData {
+    [Symbol.iterator](): IterableIterator<[string, FormDataEntryValue]>;
+    /**
+     * Returns an array of key, value pairs for every entry in the list.
+     */
+    entries(): IterableIterator<[string, FormDataEntryValue]>;
+    /**
+     * Returns a list of keys in the list.
+     */
+    keys(): IterableIterator<string>;
+    /**
+     * Returns a list of values in the list.
+     */
+    values(): IterableIterator<FormDataEntryValue>;
+}
+
+interface HTMLAllCollection {
+    [Symbol.iterator](): IterableIterator<Element>;
+}
+
+interface HTMLCollectionBase {
+    [Symbol.iterator](): IterableIterator<Element>;
+}
+
+interface HTMLCollectionOf<T extends Element> {
+    [Symbol.iterator](): IterableIterator<T>;
+    entries(): IterableIterator<[number, T]>;
+    keys(): IterableIterator<number>;
+    values(): IterableIterator<T>;
+}
+
+interface HTMLSelectElement {
+    [Symbol.iterator](): IterableIterator<Element>;
+}
+
 interface Headers {
     [Symbol.iterator](): IterableIterator<[string, string]>;
     /**
@@ -31,7 +103,7 @@ interface Headers {
      */
     entries(): IterableIterator<[string, string]>;
     /**
-     * Returns an iterator allowing to go through all keys f the key/value pairs contained in this object.
+     * Returns an iterator allowing to go through all keys of the key/value pairs contained in this object.
      */
     keys(): IterableIterator<string>;
     /**
@@ -40,96 +112,97 @@ interface Headers {
     values(): IterableIterator<string>;
 }
 
+interface MediaList {
+    [Symbol.iterator](): IterableIterator<string>;
+}
+
+interface MimeTypeArray {
+    [Symbol.iterator](): IterableIterator<Plugin>;
+}
+
+interface NamedNodeMap {
+    [Symbol.iterator](): IterableIterator<Attr>;
+}
+
 interface NodeList {
+    [Symbol.iterator](): IterableIterator<Node>;
     /**
-     * Returns an array of key, value pairs for every entry in the list
+     * Returns an array of key, value pairs for every entry in the list.
      */
     entries(): IterableIterator<[number, Node]>;
     /**
-     * Performs the specified action for each node in an list.
-     * @param callbackfn  A function that accepts up to three arguments. forEach calls the callbackfn function one time for each element in the list.
-     * @param thisArg  An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
-     */
-    forEach(callbackfn: (value: Node, index: number, listObj: NodeList) => void, thisArg?: any): void;
-    /**
-     * Returns an list of keys in the list
+     * Returns an list of keys in the list.
      */
     keys(): IterableIterator<number>;
-
     /**
-     * Returns an list of values in the list
+     * Returns an list of values in the list.
      */
     values(): IterableIterator<Node>;
-
-
-    [Symbol.iterator](): IterableIterator<Node>;
 }
 
 interface NodeListOf<TNode extends Node> {
-
+    [Symbol.iterator](): IterableIterator<TNode>;
     /**
-     * Returns an array of key, value pairs for every entry in the list
+     * Returns an array of key, value pairs for every entry in the list.
      */
     entries(): IterableIterator<[number, TNode]>;
-
     /**
-     * Performs the specified action for each node in an list.
-     * @param callbackfn  A function that accepts up to three arguments. forEach calls the callbackfn function one time for each element in the list.
-     * @param thisArg  An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
-     */
-    forEach(callbackfn: (value: TNode, index: number, listObj: NodeListOf<TNode>) => void, thisArg?: any): void;
-    /**
-     * Returns an list of keys in the list
+     * Returns an list of keys in the list.
      */
     keys(): IterableIterator<number>;
     /**
-     * Returns an list of values in the list
+     * Returns an list of values in the list.
      */
     values(): IterableIterator<TNode>;
-
-    [Symbol.iterator](): IterableIterator<TNode>;
 }
 
-interface HTMLCollectionBase {
-    [Symbol.iterator](): IterableIterator<Element>;
+interface Plugin {
+    [Symbol.iterator](): IterableIterator<MimeType>;
 }
 
-interface HTMLCollectionOf<T extends Element> {
-    [Symbol.iterator](): IterableIterator<T>;
+interface PluginArray {
+    [Symbol.iterator](): IterableIterator<Plugin>;
 }
 
-interface FormData {
-    /**
-     * Returns an array of key, value pairs for every entry in the list
-     */
-    entries(): IterableIterator<[string, string | File]>;
-    /**
-     * Returns a list of keys in the list
-     */
-    keys(): IterableIterator<string>;
-    /**
-     * Returns a list of values in the list
-     */
-    values(): IterableIterator<string | File>;
+interface RTCStatsReport extends ReadonlyMap<string, any> {
+}
 
-    [Symbol.iterator](): IterableIterator<string | File>;
+interface SourceBufferList {
+    [Symbol.iterator](): IterableIterator<SourceBuffer>;
+}
+
+interface StyleSheetList {
+    [Symbol.iterator](): IterableIterator<StyleSheet>;
+}
+
+interface TextTrackCueList {
+    [Symbol.iterator](): IterableIterator<TextTrackCue>;
+}
+
+interface TextTrackList {
+    [Symbol.iterator](): IterableIterator<TextTrack>;
+}
+
+interface TouchList {
+    [Symbol.iterator](): IterableIterator<Touch>;
 }
 
 interface URLSearchParams {
+    [Symbol.iterator](): IterableIterator<[string, string]>;
     /**
-     * Returns an array of key, value pairs for every entry in the search params
+     * Returns an array of key, value pairs for every entry in the search params.
      */
     entries(): IterableIterator<[string, string]>;
     /**
-     * Returns a list of keys in the search params
+     * Returns a list of keys in the search params.
      */
     keys(): IterableIterator<string>;
     /**
-     * Returns a list of values in the search params
+     * Returns a list of values in the search params.
      */
     values(): IterableIterator<string>;
-    /**
-     * iterate over key/value pairs
-     */
-    [Symbol.iterator](): IterableIterator<[string, string]>;
+}
+
+interface VideoTrackList {
+    [Symbol.iterator](): IterableIterator<VideoTrack>;
 }
diff --git a/lib/lib.es2015.d.ts b/lib/lib.es2015.d.ts
index d6cf43cbb7a..80aaba05b24 100644
--- a/lib/lib.es2015.d.ts
+++ b/lib/lib.es2015.d.ts
@@ -18,13 +18,13 @@ and limitations under the License.
 /// <reference no-default-lib="true"/>
 
 
-/// <reference path="lib.es2015.core.d.ts" />
-/// <reference path="lib.es2015.collection.d.ts" />
-/// <reference path="lib.es2015.generator.d.ts" />
-/// <reference path="lib.es2015.promise.d.ts" />
-/// <reference path="lib.es2015.iterable.d.ts" />
-/// <reference path="lib.es2015.proxy.d.ts" />
-/// <reference path="lib.es2015.reflect.d.ts" />
-/// <reference path="lib.es2015.symbol.d.ts" />
-/// <reference path="lib.es2015.symbol.wellknown.d.ts" />
-/// <reference path="lib.es5.d.ts" />
\ No newline at end of file
+/// <reference lib="es5" />
+/// <reference lib="es2015.core" />
+/// <reference lib="es2015.collection" />
+/// <reference lib="es2015.generator" />
+/// <reference lib="es2015.promise" />
+/// <reference lib="es2015.iterable" />
+/// <reference lib="es2015.proxy" />
+/// <reference lib="es2015.reflect" />
+/// <reference lib="es2015.symbol" />
+/// <reference lib="es2015.symbol.wellknown" />
diff --git a/lib/lib.es2015.iterable.d.ts b/lib/lib.es2015.iterable.d.ts
index 72f20e690ea..a5fb5671d81 100644
--- a/lib/lib.es2015.iterable.d.ts
+++ b/lib/lib.es2015.iterable.d.ts
@@ -18,7 +18,7 @@ and limitations under the License.
 /// <reference no-default-lib="true"/>
 
 
-/// <reference path="lib.es2015.symbol.d.ts" />
+/// <reference lib="es2015.symbol" />
 
 interface SymbolConstructor {
     /**
diff --git a/lib/lib.es2015.symbol.wellknown.d.ts b/lib/lib.es2015.symbol.wellknown.d.ts
index 65ce71cf3e3..922cbb35a82 100644
--- a/lib/lib.es2015.symbol.wellknown.d.ts
+++ b/lib/lib.es2015.symbol.wellknown.d.ts
@@ -18,7 +18,7 @@ and limitations under the License.
 /// <reference no-default-lib="true"/>
 
 
-/// <reference path="lib.es2015.symbol.d.ts" />
+/// <reference lib="es2015.symbol" />
 
 interface SymbolConstructor {
     /**
diff --git a/lib/lib.es2016.d.ts b/lib/lib.es2016.d.ts
index 50fdffa8592..b2d59b8d4d6 100644
--- a/lib/lib.es2016.d.ts
+++ b/lib/lib.es2016.d.ts
@@ -18,5 +18,5 @@ and limitations under the License.
 /// <reference no-default-lib="true"/>
 
 
-/// <reference path="lib.es2015.d.ts" />
-/// <reference path="lib.es2016.array.include.d.ts" />
\ No newline at end of file
+/// <reference lib="es2015" />
+/// <reference lib="es2016.array.include" />
\ No newline at end of file
diff --git a/lib/lib.es2016.full.d.ts b/lib/lib.es2016.full.d.ts
index 3d939b63e95..6ecfe0a67b4 100644
--- a/lib/lib.es2016.full.d.ts
+++ b/lib/lib.es2016.full.d.ts
@@ -18,16508 +18,8 @@ and limitations under the License.
 /// <reference no-default-lib="true"/>
 
 
-/// <reference path="lib.es2015.d.ts" />
-/// <reference path="lib.es2016.array.include.d.ts" />
-
-/////////////////////////////
-/// DOM APIs
-/////////////////////////////
-
-interface Account {
-    displayName: string;
-    id: string;
-    imageURL?: string;
-    name?: string;
-    rpDisplayName: string;
-}
-
-interface AddEventListenerOptions extends EventListenerOptions {
-    once?: boolean;
-    passive?: boolean;
-}
-
-interface AesCbcParams extends Algorithm {
-    iv: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-}
-
-interface AesCtrParams extends Algorithm {
-    counter: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-    length: number;
-}
-
-interface AesDerivedKeyParams extends Algorithm {
-    length: number;
-}
-
-interface AesGcmParams extends Algorithm {
-    additionalData?: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-    iv: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-    tagLength?: number;
-}
-
-interface AesKeyAlgorithm extends KeyAlgorithm {
-    length: number;
-}
-
-interface AesKeyGenParams extends Algorithm {
-    length: number;
-}
-
-interface Algorithm {
-    name: string;
-}
-
-interface AnalyserOptions extends AudioNodeOptions {
-    fftSize?: number;
-    maxDecibels?: number;
-    minDecibels?: number;
-    smoothingTimeConstant?: number;
-}
-
-interface AnimationEventInit extends EventInit {
-    animationName?: string;
-    elapsedTime?: number;
-}
-
-interface AssertionOptions {
-    allowList?: ScopedCredentialDescriptor[];
-    extensions?: WebAuthnExtensions;
-    rpId?: string;
-    timeoutSeconds?: number;
-}
-
-interface AudioBufferOptions {
-    length: number;
-    numberOfChannels?: number;
-    sampleRate: number;
-}
-
-interface AudioBufferSourceOptions {
-    buffer?: AudioBuffer | null;
-    detune?: number;
-    loop?: boolean;
-    loopEnd?: number;
-    loopStart?: number;
-    playbackRate?: number;
-}
-
-interface AudioContextInfo {
-    currentTime?: number;
-    sampleRate?: number;
-}
-
-interface AudioContextOptions {
-    latencyHint?: AudioContextLatencyCategory | number;
-    sampleRate?: number;
-}
-
-interface AudioNodeOptions {
-    channelCount?: number;
-    channelCountMode?: ChannelCountMode;
-    channelInterpretation?: ChannelInterpretation;
-}
-
-interface AudioParamDescriptor {
-    defaultValue?: number;
-    maxValue?: number;
-    minValue?: number;
-    name?: string;
-}
-
-interface AudioProcessingEventInit extends EventInit {
-    inputBuffer: AudioBuffer;
-    outputBuffer: AudioBuffer;
-    playbackTime: number;
-}
-
-interface AudioTimestamp {
-    contextTime?: number;
-    performanceTime?: number;
-}
-
-interface BiquadFilterOptions extends AudioNodeOptions {
-    Q?: number;
-    detune?: number;
-    frequency?: number;
-    gain?: number;
-    type?: BiquadFilterType;
-}
-
-interface ByteLengthChunk {
-    byteLength?: number;
-}
-
-interface CacheQueryOptions {
-    cacheName?: string;
-    ignoreMethod?: boolean;
-    ignoreSearch?: boolean;
-    ignoreVary?: boolean;
-}
-
-interface ChannelMergerOptions extends AudioNodeOptions {
-    numberOfInputs?: number;
-}
-
-interface ChannelSplitterOptions extends AudioNodeOptions {
-    numberOfOutputs?: number;
-}
-
-interface ClientData {
-    challenge: string;
-    extensions?: WebAuthnExtensions;
-    hashAlg: string | Algorithm;
-    origin: string;
-    rpId: string;
-    tokenBinding?: string;
-}
-
-interface ClientQueryOptions {
-    includeReserved?: boolean;
-    includeUncontrolled?: boolean;
-    type?: ClientTypes;
-}
-
-interface CloseEventInit extends EventInit {
-    code?: number;
-    reason?: string;
-    wasClean?: boolean;
-}
-
-interface CompositionEventInit extends UIEventInit {
-    data?: string;
-}
-
-interface ConfirmSiteSpecificExceptionsInformation extends ExceptionInformation {
-    arrayOfDomainStrings?: string[];
-}
-
-interface ConstantSourceOptions {
-    offset?: number;
-}
-
-interface ConstrainBooleanParameters {
-    exact?: boolean;
-    ideal?: boolean;
-}
-
-interface ConstrainDOMStringParameters {
-    exact?: string | string[];
-    ideal?: string | string[];
-}
-
-interface ConstrainDoubleRange extends DoubleRange {
-    exact?: number;
-    ideal?: number;
-}
-
-interface ConstrainLongRange extends LongRange {
-    exact?: number;
-    ideal?: number;
-}
-
-interface ConstrainVideoFacingModeParameters {
-    exact?: VideoFacingModeEnum | VideoFacingModeEnum[];
-    ideal?: VideoFacingModeEnum | VideoFacingModeEnum[];
-}
-
-interface ConvolverOptions extends AudioNodeOptions {
-    buffer?: AudioBuffer | null;
-    disableNormalization?: boolean;
-}
-
-interface CustomEventInit<T = any> extends EventInit {
-    detail?: T;
-}
-
-interface DOMRectInit {
-    height?: number;
-    width?: number;
-    x?: number;
-    y?: number;
-}
-
-interface DelayOptions extends AudioNodeOptions {
-    delayTime?: number;
-    maxDelayTime?: number;
-}
-
-interface DeviceAccelerationDict {
-    x?: number | null;
-    y?: number | null;
-    z?: number | null;
-}
-
-interface DeviceLightEventInit extends EventInit {
-    value?: number;
-}
-
-interface DeviceMotionEventInit extends EventInit {
-    acceleration?: DeviceAccelerationDict | null;
-    accelerationIncludingGravity?: DeviceAccelerationDict | null;
-    interval?: number | null;
-    rotationRate?: DeviceRotationRateDict | null;
-}
-
-interface DeviceOrientationEventInit extends EventInit {
-    absolute?: boolean;
-    alpha?: number | null;
-    beta?: number | null;
-    gamma?: number | null;
-}
-
-interface DeviceRotationRateDict {
-    alpha?: number | null;
-    beta?: number | null;
-    gamma?: number | null;
-}
-
-interface DoubleRange {
-    max?: number;
-    min?: number;
-}
-
-interface DynamicsCompressorOptions extends AudioNodeOptions {
-    attack?: number;
-    knee?: number;
-    ratio?: number;
-    release?: number;
-    threshold?: number;
-}
-
-interface EcKeyAlgorithm extends KeyAlgorithm {
-    namedCurve: string;
-}
-
-interface EcKeyGenParams extends Algorithm {
-    namedCurve: string;
-}
-
-interface EcKeyImportParams extends Algorithm {
-    namedCurve: string;
-}
-
-interface EcdhKeyDeriveParams extends Algorithm {
-    public: CryptoKey;
-}
-
-interface EcdsaParams extends Algorithm {
-    hash: string | Algorithm;
-}
-
-interface ErrorEventInit extends EventInit {
-    colno?: number;
-    error?: any;
-    filename?: string;
-    lineno?: number;
-    message?: string;
-}
-
-interface EventInit {
-    bubbles?: boolean;
-    cancelable?: boolean;
-    scoped?: boolean;
-}
-
-interface EventListenerOptions {
-    capture?: boolean;
-}
-
-interface EventModifierInit extends UIEventInit {
-    altKey?: boolean;
-    ctrlKey?: boolean;
-    metaKey?: boolean;
-    modifierAltGraph?: boolean;
-    modifierCapsLock?: boolean;
-    modifierFn?: boolean;
-    modifierFnLock?: boolean;
-    modifierHyper?: boolean;
-    modifierNumLock?: boolean;
-    modifierOS?: boolean;
-    modifierScrollLock?: boolean;
-    modifierSuper?: boolean;
-    modifierSymbol?: boolean;
-    modifierSymbolLock?: boolean;
-    shiftKey?: boolean;
-}
-
-interface ExceptionInformation {
-    domain?: string | null;
-}
-
-interface ExtendableEventInit extends EventInit {
-}
-
-interface ExtendableMessageEventInit extends ExtendableEventInit {
-    data?: any;
-    lastEventId?: string;
-    origin?: string;
-    ports?: MessagePort[] | null;
-    source?: object | ServiceWorker | MessagePort | null;
-}
-
-interface FetchEventInit extends ExtendableEventInit {
-    clientId?: string;
-    request: Request;
-    reservedClientId?: string;
-    targetClientId?: string;
-}
-
-interface FocusEventInit extends UIEventInit {
-    relatedTarget?: EventTarget | null;
-}
-
-interface FocusNavigationEventInit extends EventInit {
-    navigationReason?: string | null;
-    originHeight?: number;
-    originLeft?: number;
-    originTop?: number;
-    originWidth?: number;
-}
-
-interface FocusNavigationOrigin {
-    originHeight?: number;
-    originLeft?: number;
-    originTop?: number;
-    originWidth?: number;
-}
-
-interface GainOptions extends AudioNodeOptions {
-    gain?: number;
-}
-
-interface GamepadEventInit extends EventInit {
-    gamepad?: Gamepad;
-}
-
-interface GetNotificationOptions {
-    tag?: string;
-}
-
-interface HashChangeEventInit extends EventInit {
-    newURL?: string;
-    oldURL?: string;
-}
-
-interface HkdfParams extends Algorithm {
-    hash: string | Algorithm;
-    info: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-    salt: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-}
-
-interface HmacImportParams extends Algorithm {
-    hash: string | Algorithm;
-    length?: number;
-}
-
-interface HmacKeyAlgorithm extends KeyAlgorithm {
-    hash: KeyAlgorithm;
-    length: number;
-}
-
-interface HmacKeyGenParams extends Algorithm {
-    hash: string | Algorithm;
-    length?: number;
-}
-
-interface IDBIndexParameters {
-    multiEntry?: boolean;
-    unique?: boolean;
-}
-
-interface IDBObjectStoreParameters {
-    autoIncrement?: boolean;
-    keyPath?: string | string[];
-}
-
-interface IIRFilterOptions extends AudioNodeOptions {
-    feedback: number[];
-    feedforward: number[];
-}
-
-interface IntersectionObserverEntryInit {
-    boundingClientRect: DOMRectInit;
-    intersectionRect: DOMRectInit;
-    isIntersecting: boolean;
-    rootBounds: DOMRectInit;
-    target: Element;
-    time: number;
-}
-
-interface IntersectionObserverInit {
-    root?: Element | null;
-    rootMargin?: string;
-    threshold?: number | number[];
-}
-
-interface JsonWebKey {
-    alg?: string;
-    crv?: string;
-    d?: string;
-    dp?: string;
-    dq?: string;
-    e?: string;
-    ext?: boolean;
-    k?: string;
-    key_ops?: string[];
-    kty?: string;
-    n?: string;
-    oth?: RsaOtherPrimesInfo[];
-    p?: string;
-    q?: string;
-    qi?: string;
-    use?: string;
-    x?: string;
-    y?: string;
-}
-
-interface KeyAlgorithm {
-    name: string;
-}
-
-interface KeyboardEventInit extends EventModifierInit {
-    code?: string;
-    key?: string;
-    location?: number;
-    repeat?: boolean;
-}
-
-interface LongRange {
-    max?: number;
-    min?: number;
-}
-
-interface MSAccountInfo {
-    accountImageUri?: string;
-    accountName?: string;
-    rpDisplayName: string;
-    userDisplayName: string;
-    userId?: string;
-}
-
-interface MSAudioLocalClientEvent extends MSLocalClientEventBase {
-    cpuInsufficientEventRatio?: number;
-    deviceCaptureNotFunctioningEventRatio?: number;
-    deviceClippingEventRatio?: number;
-    deviceEchoEventRatio?: number;
-    deviceGlitchesEventRatio?: number;
-    deviceHalfDuplexAECEventRatio?: number;
-    deviceHowlingEventCount?: number;
-    deviceLowSNREventRatio?: number;
-    deviceLowSpeechLevelEventRatio?: number;
-    deviceMultipleEndpointsEventCount?: number;
-    deviceNearEndToEchoRatioEventRatio?: number;
-    deviceRenderMuteEventRatio?: number;
-    deviceRenderNotFunctioningEventRatio?: number;
-    deviceRenderZeroVolumeEventRatio?: number;
-    networkDelayEventRatio?: number;
-    networkSendQualityEventRatio?: number;
-}
-
-interface MSAudioRecvPayload extends MSPayloadBase {
-    burstLossLength1?: number;
-    burstLossLength2?: number;
-    burstLossLength3?: number;
-    burstLossLength4?: number;
-    burstLossLength5?: number;
-    burstLossLength6?: number;
-    burstLossLength7?: number;
-    burstLossLength8OrHigher?: number;
-    fecRecvDistance1?: number;
-    fecRecvDistance2?: number;
-    fecRecvDistance3?: number;
-    packetReorderDepthAvg?: number;
-    packetReorderDepthMax?: number;
-    packetReorderRatio?: number;
-    ratioCompressedSamplesAvg?: number;
-    ratioConcealedSamplesAvg?: number;
-    ratioStretchedSamplesAvg?: number;
-    samplingRate?: number;
-    signal?: MSAudioRecvSignal;
-}
-
-interface MSAudioRecvSignal {
-    initialSignalLevelRMS?: number;
-    recvNoiseLevelCh1?: number;
-    recvSignalLevelCh1?: number;
-    renderLoopbackSignalLevel?: number;
-    renderNoiseLevel?: number;
-    renderSignalLevel?: number;
-}
-
-interface MSAudioSendPayload extends MSPayloadBase {
-    audioFECUsed?: boolean;
-    samplingRate?: number;
-    sendMutePercent?: number;
-    signal?: MSAudioSendSignal;
-}
-
-interface MSAudioSendSignal {
-    noiseLevel?: number;
-    sendNoiseLevelCh1?: number;
-    sendSignalLevelCh1?: number;
-}
-
-interface MSConnectivity {
-    iceType?: MSIceType;
-    iceWarningFlags?: MSIceWarningFlags;
-    relayAddress?: MSRelayAddress;
-}
-
-interface MSCredentialFilter {
-    accept?: MSCredentialSpec[];
-}
-
-interface MSCredentialParameters {
-    type?: MSCredentialType;
-}
-
-interface MSCredentialSpec {
-    id?: string;
-    type: MSCredentialType;
-}
-
-interface MSDCCEventInit extends EventInit {
-    maxFr?: number;
-    maxFs?: number;
-}
-
-interface MSDSHEventInit extends EventInit {
-    sources?: number[];
-    timestamp?: number;
-}
-
-interface MSDelay {
-    roundTrip?: number;
-    roundTripMax?: number;
-}
-
-interface MSDescription extends RTCStats {
-    connectivity?: MSConnectivity;
-    deviceDevName?: string;
-    localAddr?: MSIPAddressInfo;
-    networkconnectivity?: MSNetworkConnectivityInfo;
-    reflexiveLocalIPAddr?: MSIPAddressInfo;
-    remoteAddr?: MSIPAddressInfo;
-    transport?: RTCIceProtocol;
-}
-
-interface MSFIDOCredentialParameters extends MSCredentialParameters {
-    algorithm?: string | Algorithm;
-    authenticators?: string[];
-}
-
-interface MSIPAddressInfo {
-    ipAddr?: string;
-    manufacturerMacAddrMask?: string;
-    port?: number;
-}
-
-interface MSIceWarningFlags {
-    allocationMessageIntegrityFailed?: boolean;
-    alternateServerReceived?: boolean;
-    connCheckMessageIntegrityFailed?: boolean;
-    connCheckOtherError?: boolean;
-    fipsAllocationFailure?: boolean;
-    multipleRelayServersAttempted?: boolean;
-    noRelayServersConfigured?: boolean;
-    portRangeExhausted?: boolean;
-    pseudoTLSFailure?: boolean;
-    tcpNatConnectivityFailed?: boolean;
-    tcpRelayConnectivityFailed?: boolean;
-    turnAuthUnknownUsernameError?: boolean;
-    turnTcpAllocateFailed?: boolean;
-    turnTcpSendFailed?: boolean;
-    turnTcpTimedOut?: boolean;
-    turnTurnTcpConnectivityFailed?: boolean;
-    turnUdpAllocateFailed?: boolean;
-    turnUdpSendFailed?: boolean;
-    udpLocalConnectivityFailed?: boolean;
-    udpNatConnectivityFailed?: boolean;
-    udpRelayConnectivityFailed?: boolean;
-    useCandidateChecksFailed?: boolean;
-}
-
-interface MSJitter {
-    interArrival?: number;
-    interArrivalMax?: number;
-    interArrivalSD?: number;
-}
-
-interface MSLocalClientEventBase extends RTCStats {
-    networkBandwidthLowEventRatio?: number;
-    networkReceiveQualityEventRatio?: number;
-}
-
-interface MSNetwork extends RTCStats {
-    delay?: MSDelay;
-    jitter?: MSJitter;
-    packetLoss?: MSPacketLoss;
-    utilization?: MSUtilization;
-}
-
-interface MSNetworkConnectivityInfo {
-    linkspeed?: number;
-    networkConnectionDetails?: string;
-    vpn?: boolean;
-}
-
-interface MSNetworkInterfaceType {
-    interfaceTypeEthernet?: boolean;
-    interfaceTypePPP?: boolean;
-    interfaceTypeTunnel?: boolean;
-    interfaceTypeWWAN?: boolean;
-    interfaceTypeWireless?: boolean;
-}
-
-interface MSOutboundNetwork extends MSNetwork {
-    appliedBandwidthLimit?: number;
-}
-
-interface MSPacketLoss {
-    lossRate?: number;
-    lossRateMax?: number;
-}
-
-interface MSPayloadBase extends RTCStats {
-    payloadDescription?: string;
-}
-
-interface MSPortRange {
-    max?: number;
-    min?: number;
-}
-
-interface MSRelayAddress {
-    port?: number;
-    relayAddress?: string;
-}
-
-interface MSSignatureParameters {
-    userPrompt?: string;
-}
-
-interface MSTransportDiagnosticsStats extends RTCStats {
-    allocationTimeInMs?: number;
-    baseAddress?: string;
-    baseInterface?: MSNetworkInterfaceType;
-    iceRole?: RTCIceRole;
-    iceWarningFlags?: MSIceWarningFlags;
-    interfaces?: MSNetworkInterfaceType;
-    localAddrType?: MSIceAddrType;
-    localAddress?: string;
-    localInterface?: MSNetworkInterfaceType;
-    localMR?: string;
-    localMRTCPPort?: number;
-    localSite?: string;
-    msRtcEngineVersion?: string;
-    networkName?: string;
-    numConsentReqReceived?: number;
-    numConsentReqSent?: number;
-    numConsentRespReceived?: number;
-    numConsentRespSent?: number;
-    portRangeMax?: number;
-    portRangeMin?: number;
-    protocol?: RTCIceProtocol;
-    remoteAddrType?: MSIceAddrType;
-    remoteAddress?: string;
-    remoteMR?: string;
-    remoteMRTCPPort?: number;
-    remoteSite?: string;
-    rtpRtcpMux?: boolean;
-    stunVer?: number;
-}
-
-interface MSUtilization {
-    bandwidthEstimation?: number;
-    bandwidthEstimationAvg?: number;
-    bandwidthEstimationMax?: number;
-    bandwidthEstimationMin?: number;
-    bandwidthEstimationStdDev?: number;
-    packets?: number;
-}
-
-interface MSVideoPayload extends MSPayloadBase {
-    durationSeconds?: number;
-    resolution?: string;
-    videoBitRateAvg?: number;
-    videoBitRateMax?: number;
-    videoFrameRateAvg?: number;
-    videoPacketLossRate?: number;
-}
-
-interface MSVideoRecvPayload extends MSVideoPayload {
-    lowBitRateCallPercent?: number;
-    lowFrameRateCallPercent?: number;
-    recvBitRateAverage?: number;
-    recvBitRateMaximum?: number;
-    recvCodecType?: string;
-    recvFpsHarmonicAverage?: number;
-    recvFrameRateAverage?: number;
-    recvNumResSwitches?: number;
-    recvReorderBufferMaxSuccessfullyOrderedExtent?: number;
-    recvReorderBufferMaxSuccessfullyOrderedLateTime?: number;
-    recvReorderBufferPacketsDroppedDueToBufferExhaustion?: number;
-    recvReorderBufferPacketsDroppedDueToTimeout?: number;
-    recvReorderBufferReorderedPackets?: number;
-    recvResolutionHeight?: number;
-    recvResolutionWidth?: number;
-    recvVideoStreamsMax?: number;
-    recvVideoStreamsMin?: number;
-    recvVideoStreamsMode?: number;
-    reorderBufferTotalPackets?: number;
-    videoFrameLossRate?: number;
-    videoPostFECPLR?: number;
-    videoResolutions?: MSVideoResolutionDistribution;
-}
-
-interface MSVideoResolutionDistribution {
-    cifQuality?: number;
-    h1080Quality?: number;
-    h1440Quality?: number;
-    h2160Quality?: number;
-    h720Quality?: number;
-    vgaQuality?: number;
-}
-
-interface MSVideoSendPayload extends MSVideoPayload {
-    sendBitRateAverage?: number;
-    sendBitRateMaximum?: number;
-    sendFrameRateAverage?: number;
-    sendResolutionHeight?: number;
-    sendResolutionWidth?: number;
-    sendVideoStreamsMax?: number;
-}
-
-interface MediaElementAudioSourceOptions {
-    mediaElement: HTMLMediaElement;
-}
-
-interface MediaEncryptedEventInit extends EventInit {
-    initData?: ArrayBuffer | null;
-    initDataType?: string;
-}
-
-interface MediaKeyMessageEventInit extends EventInit {
-    message?: ArrayBuffer | null;
-    messageType?: MediaKeyMessageType;
-}
-
-interface MediaKeySystemConfiguration {
-    audioCapabilities?: MediaKeySystemMediaCapability[];
-    distinctiveIdentifier?: MediaKeysRequirement;
-    initDataTypes?: string[];
-    persistentState?: MediaKeysRequirement;
-    videoCapabilities?: MediaKeySystemMediaCapability[];
-}
-
-interface MediaKeySystemMediaCapability {
-    contentType?: string;
-    robustness?: string;
-}
-
-interface MediaStreamConstraints {
-    audio?: boolean | MediaTrackConstraints;
-    video?: boolean | MediaTrackConstraints;
-}
-
-interface MediaStreamErrorEventInit extends EventInit {
-    error?: MediaStreamError | null;
-}
-
-interface MediaStreamEventInit extends EventInit {
-    stream?: MediaStream;
-}
-
-interface MediaStreamTrackEventInit extends EventInit {
-    track?: MediaStreamTrack | null;
-}
-
-interface MediaTrackCapabilities {
-    aspectRatio?: number | DoubleRange;
-    deviceId?: string;
-    echoCancellation?: boolean[];
-    facingMode?: string;
-    frameRate?: number | DoubleRange;
-    groupId?: string;
-    height?: number | LongRange;
-    sampleRate?: number | LongRange;
-    sampleSize?: number | LongRange;
-    volume?: number | DoubleRange;
-    width?: number | LongRange;
-}
-
-interface MediaTrackConstraintSet {
-    aspectRatio?: number | ConstrainDoubleRange;
-    channelCount?: number | ConstrainLongRange;
-    deviceId?: string | string[] | ConstrainDOMStringParameters;
-    displaySurface?: string | string[] | ConstrainDOMStringParameters;
-    echoCancellation?: boolean | ConstrainBooleanParameters;
-    facingMode?: string | string[] | ConstrainDOMStringParameters;
-    frameRate?: number | ConstrainDoubleRange;
-    groupId?: string | string[] | ConstrainDOMStringParameters;
-    height?: number | ConstrainLongRange;
-    latency?: number | ConstrainDoubleRange;
-    logicalSurface?: boolean | ConstrainBooleanParameters;
-    sampleRate?: number | ConstrainLongRange;
-    sampleSize?: number | ConstrainLongRange;
-    volume?: number | ConstrainDoubleRange;
-    width?: number | ConstrainLongRange;
-}
-
-interface MediaTrackConstraints extends MediaTrackConstraintSet {
-    advanced?: MediaTrackConstraintSet[];
-}
-
-interface MediaTrackSettings {
-    aspectRatio?: number;
-    deviceId?: string;
-    echoCancellation?: boolean;
-    facingMode?: string;
-    frameRate?: number;
-    groupId?: string;
-    height?: number;
-    sampleRate?: number;
-    sampleSize?: number;
-    volume?: number;
-    width?: number;
-}
-
-interface MediaTrackSupportedConstraints {
-    aspectRatio?: boolean;
-    deviceId?: boolean;
-    echoCancellation?: boolean;
-    facingMode?: boolean;
-    frameRate?: boolean;
-    groupId?: boolean;
-    height?: boolean;
-    sampleRate?: boolean;
-    sampleSize?: boolean;
-    volume?: boolean;
-    width?: boolean;
-}
-
-interface MessageEventInit extends EventInit {
-    channel?: string;
-    data?: any;
-    lastEventId?: string;
-    origin?: string;
-    ports?: MessagePort[];
-    source?: Window | null;
-}
-
-interface MouseEventInit extends EventModifierInit {
-    button?: number;
-    buttons?: number;
-    clientX?: number;
-    clientY?: number;
-    relatedTarget?: EventTarget | null;
-    screenX?: number;
-    screenY?: number;
-}
-
-interface MsZoomToOptions {
-    animate?: string;
-    contentX?: number;
-    contentY?: number;
-    scaleFactor?: number;
-    viewportX?: string | null;
-    viewportY?: string | null;
-}
-
-interface MutationObserverInit {
-    attributeFilter?: string[];
-    attributeOldValue?: boolean;
-    attributes?: boolean;
-    characterData?: boolean;
-    characterDataOldValue?: boolean;
-    childList?: boolean;
-    subtree?: boolean;
-}
-
-interface NotificationEventInit extends ExtendableEventInit {
-    action?: string;
-    notification: Notification;
-}
-
-interface NotificationOptions {
-    body?: string;
-    data?: any;
-    dir?: NotificationDirection;
-    icon?: string;
-    lang?: string;
-    tag?: string;
-}
-
-interface ObjectURLOptions {
-    oneTimeOnly?: boolean;
-}
-
-interface OfflineAudioCompletionEventInit extends EventInit {
-    renderedBuffer: AudioBuffer;
-}
-
-interface OscillatorOptions extends AudioNodeOptions {
-    detune?: number;
-    frequency?: number;
-    periodicWave?: PeriodicWave;
-    type?: OscillatorType;
-}
-
-interface PannerOptions extends AudioNodeOptions {
-    coneInnerAngle?: number;
-    coneOuterAngle?: number;
-    coneOuterGain?: number;
-    distanceModel?: DistanceModelType;
-    maxDistance?: number;
-    orientationX?: number;
-    orientationY?: number;
-    orientationZ?: number;
-    panningModel?: PanningModelType;
-    positionX?: number;
-    positionY?: number;
-    positionZ?: number;
-    refDistance?: number;
-    rolloffFactor?: number;
-}
-
-interface PaymentCurrencyAmount {
-    currency: string;
-    currencySystem?: string;
-    value: string;
-}
-
-interface PaymentDetailsBase {
-    displayItems?: PaymentItem[];
-    modifiers?: PaymentDetailsModifier[];
-    shippingOptions?: PaymentShippingOption[];
-}
-
-interface PaymentDetailsInit extends PaymentDetailsBase {
-    id?: string;
-    total: PaymentItem;
-}
-
-interface PaymentDetailsModifier {
-    additionalDisplayItems?: PaymentItem[];
-    data?: any;
-    supportedMethods: string | string[];
-    total?: PaymentItem;
-}
-
-interface PaymentDetailsUpdate extends PaymentDetailsBase {
-    error?: string;
-    total?: PaymentItem;
-}
-
-interface PaymentItem {
-    amount: PaymentCurrencyAmount;
-    label: string;
-    pending?: boolean;
-}
-
-interface PaymentMethodData {
-    data?: any;
-    supportedMethods: string | string[];
-}
-
-interface PaymentOptions {
-    requestPayerEmail?: boolean;
-    requestPayerName?: boolean;
-    requestPayerPhone?: boolean;
-    requestShipping?: boolean;
-    shippingType?: string;
-}
-
-interface PaymentRequestUpdateEventInit extends EventInit {
-}
-
-interface PaymentShippingOption {
-    amount: PaymentCurrencyAmount;
-    id: string;
-    label: string;
-    selected?: boolean;
-}
-
-interface Pbkdf2Params extends Algorithm {
-    hash: string | Algorithm;
-    iterations: number;
-    salt: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-}
-
-interface PeriodicWaveConstraints {
-    disableNormalization?: boolean;
-}
-
-interface PeriodicWaveOptions extends PeriodicWaveConstraints {
-    imag?: number[];
-    real?: number[];
-}
-
-interface PointerEventInit extends MouseEventInit {
-    height?: number;
-    isPrimary?: boolean;
-    pointerId?: number;
-    pointerType?: string;
-    pressure?: number;
-    tiltX?: number;
-    tiltY?: number;
-    width?: number;
-}
-
-interface PopStateEventInit extends EventInit {
-    state?: any;
-}
-
-interface PositionOptions {
-    enableHighAccuracy?: boolean;
-    maximumAge?: number;
-    timeout?: number;
-}
-
-interface ProgressEventInit extends EventInit {
-    lengthComputable?: boolean;
-    loaded?: number;
-    total?: number;
-}
-
-interface PushEventInit extends ExtendableEventInit {
-    data?: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | string | null;
-}
-
-interface PushSubscriptionChangeInit extends ExtendableEventInit {
-    newSubscription?: PushSubscription;
-    oldSubscription?: PushSubscription;
-}
-
-interface PushSubscriptionOptionsInit {
-    applicationServerKey?: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | string | null;
-    userVisibleOnly?: boolean;
-}
-
-interface QueuingStrategy {
-    highWaterMark?: number;
-    size?: WritableStreamChunkCallback;
-}
-
-interface RTCConfiguration {
-    bundlePolicy?: RTCBundlePolicy;
-    iceServers?: RTCIceServer[];
-    iceTransportPolicy?: RTCIceTransportPolicy;
-    peerIdentity?: string;
-}
-
-interface RTCDTMFToneChangeEventInit extends EventInit {
-    tone?: string;
-}
-
-interface RTCDtlsFingerprint {
-    algorithm?: string;
-    value?: string;
-}
-
-interface RTCDtlsParameters {
-    fingerprints?: RTCDtlsFingerprint[];
-    role?: RTCDtlsRole;
-}
-
-interface RTCIceCandidateAttributes extends RTCStats {
-    addressSourceUrl?: string;
-    candidateType?: RTCStatsIceCandidateType;
-    ipAddress?: string;
-    portNumber?: number;
-    priority?: number;
-    transport?: string;
-}
-
-interface RTCIceCandidateComplete {
-}
-
-interface RTCIceCandidateDictionary {
-    foundation?: string;
-    ip?: string;
-    msMTurnSessionId?: string;
-    port?: number;
-    priority?: number;
-    protocol?: RTCIceProtocol;
-    relatedAddress?: string;
-    relatedPort?: number;
-    tcpType?: RTCIceTcpCandidateType;
-    type?: RTCIceCandidateType;
-}
-
-interface RTCIceCandidateInit {
-    candidate?: string;
-    sdpMLineIndex?: number;
-    sdpMid?: string;
-}
-
-interface RTCIceCandidatePair {
-    local?: RTCIceCandidateDictionary;
-    remote?: RTCIceCandidateDictionary;
-}
-
-interface RTCIceCandidatePairStats extends RTCStats {
-    availableIncomingBitrate?: number;
-    availableOutgoingBitrate?: number;
-    bytesReceived?: number;
-    bytesSent?: number;
-    localCandidateId?: string;
-    nominated?: boolean;
-    priority?: number;
-    readable?: boolean;
-    remoteCandidateId?: string;
-    roundTripTime?: number;
-    state?: RTCStatsIceCandidatePairState;
-    transportId?: string;
-    writable?: boolean;
-}
-
-interface RTCIceGatherOptions {
-    gatherPolicy?: RTCIceGatherPolicy;
-    iceservers?: RTCIceServer[];
-    portRange?: MSPortRange;
-}
-
-interface RTCIceParameters {
-    iceLite?: boolean | null;
-    password?: string;
-    usernameFragment?: string;
-}
-
-interface RTCIceServer {
-    credential?: string | null;
-    urls?: any;
-    username?: string | null;
-}
-
-interface RTCInboundRTPStreamStats extends RTCRTPStreamStats {
-    bytesReceived?: number;
-    fractionLost?: number;
-    jitter?: number;
-    packetsLost?: number;
-    packetsReceived?: number;
-}
-
-interface RTCMediaStreamTrackStats extends RTCStats {
-    audioLevel?: number;
-    echoReturnLoss?: number;
-    echoReturnLossEnhancement?: number;
-    frameHeight?: number;
-    frameWidth?: number;
-    framesCorrupted?: number;
-    framesDecoded?: number;
-    framesDropped?: number;
-    framesPerSecond?: number;
-    framesReceived?: number;
-    framesSent?: number;
-    remoteSource?: boolean;
-    ssrcIds?: string[];
-    trackIdentifier?: string;
-}
-
-interface RTCOfferOptions {
-    iceRestart?: boolean;
-    offerToReceiveAudio?: number;
-    offerToReceiveVideo?: number;
-    voiceActivityDetection?: boolean;
-}
-
-interface RTCOutboundRTPStreamStats extends RTCRTPStreamStats {
-    bytesSent?: number;
-    packetsSent?: number;
-    roundTripTime?: number;
-    targetBitrate?: number;
-}
-
-interface RTCPeerConnectionIceEventInit extends EventInit {
-    candidate?: RTCIceCandidate;
-}
-
-interface RTCRTPStreamStats extends RTCStats {
-    associateStatsId?: string;
-    codecId?: string;
-    firCount?: number;
-    isRemote?: boolean;
-    mediaTrackId?: string;
-    mediaType?: string;
-    nackCount?: number;
-    pliCount?: number;
-    sliCount?: number;
-    ssrc?: string;
-    transportId?: string;
-}
-
-interface RTCRtcpFeedback {
-    parameter?: string;
-    type?: string;
-}
-
-interface RTCRtcpParameters {
-    cname?: string;
-    mux?: boolean;
-    reducedSize?: boolean;
-    ssrc?: number;
-}
-
-interface RTCRtpCapabilities {
-    codecs?: RTCRtpCodecCapability[];
-    fecMechanisms?: string[];
-    headerExtensions?: RTCRtpHeaderExtension[];
-}
-
-interface RTCRtpCodecCapability {
-    clockRate?: number;
-    kind?: string;
-    maxSpatialLayers?: number;
-    maxTemporalLayers?: number;
-    maxptime?: number;
-    name?: string;
-    numChannels?: number;
-    options?: any;
-    parameters?: any;
-    preferredPayloadType?: number;
-    ptime?: number;
-    rtcpFeedback?: RTCRtcpFeedback[];
-    svcMultiStreamSupport?: boolean;
-}
-
-interface RTCRtpCodecParameters {
-    clockRate?: number;
-    maxptime?: number;
-    name?: string;
-    numChannels?: number;
-    parameters?: any;
-    payloadType?: number;
-    ptime?: number;
-    rtcpFeedback?: RTCRtcpFeedback[];
-}
-
-interface RTCRtpContributingSource {
-    audioLevel?: number;
-    csrc?: number;
-    timestamp?: number;
-}
-
-interface RTCRtpEncodingParameters {
-    active?: boolean;
-    codecPayloadType?: number;
-    dependencyEncodingIds?: string[];
-    encodingId?: string;
-    fec?: RTCRtpFecParameters;
-    framerateScale?: number;
-    maxBitrate?: number;
-    maxFramerate?: number;
-    minQuality?: number;
-    priority?: number;
-    resolutionScale?: number;
-    rtx?: RTCRtpRtxParameters;
-    ssrc?: number;
-    ssrcRange?: RTCSsrcRange;
-}
-
-interface RTCRtpFecParameters {
-    mechanism?: string;
-    ssrc?: number;
-}
-
-interface RTCRtpHeaderExtension {
-    kind?: string;
-    preferredEncrypt?: boolean;
-    preferredId?: number;
-    uri?: string;
-}
-
-interface RTCRtpHeaderExtensionParameters {
-    encrypt?: boolean;
-    id?: number;
-    uri?: string;
-}
-
-interface RTCRtpParameters {
-    codecs?: RTCRtpCodecParameters[];
-    degradationPreference?: RTCDegradationPreference;
-    encodings?: RTCRtpEncodingParameters[];
-    headerExtensions?: RTCRtpHeaderExtensionParameters[];
-    muxId?: string;
-    rtcp?: RTCRtcpParameters;
-}
-
-interface RTCRtpRtxParameters {
-    ssrc?: number;
-}
-
-interface RTCRtpUnhandled {
-    muxId?: string;
-    payloadType?: number;
-    ssrc?: number;
-}
-
-interface RTCSessionDescriptionInit {
-    sdp?: string;
-    type?: RTCSdpType;
-}
-
-interface RTCSrtpKeyParam {
-    keyMethod?: string;
-    keySalt?: string;
-    lifetime?: string;
-    mkiLength?: number;
-    mkiValue?: number;
-}
-
-interface RTCSrtpSdesParameters {
-    cryptoSuite?: string;
-    keyParams?: RTCSrtpKeyParam[];
-    sessionParams?: string[];
-    tag?: number;
-}
-
-interface RTCSsrcRange {
-    max?: number;
-    min?: number;
-}
-
-interface RTCStats {
-    id?: string;
-    msType?: MSStatsType;
-    timestamp?: number;
-    type?: RTCStatsType;
-}
-
-interface RTCStatsReport {
-}
-
-interface RTCTransportStats extends RTCStats {
-    activeConnection?: boolean;
-    bytesReceived?: number;
-    bytesSent?: number;
-    localCertificateId?: string;
-    remoteCertificateId?: string;
-    rtcpTransportStatsId?: string;
-    selectedCandidatePairId?: string;
-}
-
-interface RegistrationOptions {
-    scope?: string;
-}
-
-interface RequestInit {
-    body?: Blob | Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | FormData | string | null;
-    cache?: RequestCache;
-    credentials?: RequestCredentials;
-    headers?: HeadersInit;
-    integrity?: string;
-    keepalive?: boolean;
-    method?: string;
-    mode?: RequestMode;
-    redirect?: RequestRedirect;
-    referrer?: string;
-    referrerPolicy?: ReferrerPolicy;
-    signal?: AbortSignal;
-    window?: any;
-}
-
-interface ResponseInit {
-    headers?: HeadersInit;
-    status?: number;
-    statusText?: string;
-}
-
-interface RsaHashedImportParams extends Algorithm {
-    hash: string | Algorithm;
-}
-
-interface RsaHashedKeyAlgorithm extends RsaKeyAlgorithm {
-    hash: KeyAlgorithm;
-}
-
-interface RsaHashedKeyGenParams extends RsaKeyGenParams {
-    hash: string | Algorithm;
-}
-
-interface RsaKeyAlgorithm extends KeyAlgorithm {
-    modulusLength: number;
-    publicExponent: Uint8Array;
-}
-
-interface RsaKeyGenParams extends Algorithm {
-    modulusLength: number;
-    publicExponent: Uint8Array;
-}
-
-interface RsaOaepParams extends Algorithm {
-    label?: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-}
-
-interface RsaOtherPrimesInfo {
-    d?: string;
-    r?: string;
-    t?: string;
-}
-
-interface RsaPssParams extends Algorithm {
-    saltLength: number;
-}
-
-interface ScopedCredentialDescriptor {
-    id: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-    transports?: Transport[];
-    type: ScopedCredentialType;
-}
-
-interface ScopedCredentialOptions {
-    excludeList?: ScopedCredentialDescriptor[];
-    extensions?: WebAuthnExtensions;
-    rpId?: string;
-    timeoutSeconds?: number;
-}
-
-interface ScopedCredentialParameters {
-    algorithm: string | Algorithm;
-    type: ScopedCredentialType;
-}
-
-interface SecurityPolicyViolationEventInit extends EventInit {
-    blockedURI?: string;
-    columnNumber?: number;
-    documentURI?: string;
-    effectiveDirective?: string;
-    lineNumber?: number;
-    originalPolicy?: string;
-    referrer?: string;
-    sourceFile?: string;
-    statusCode?: number;
-    violatedDirective?: string;
-}
-
-interface ServiceWorkerMessageEventInit extends EventInit {
-    data?: any;
-    lastEventId?: string;
-    origin?: string;
-    ports?: MessagePort[] | null;
-    source?: ServiceWorker | MessagePort | null;
-}
-
-interface SpeechSynthesisEventInit extends EventInit {
-    charIndex?: number;
-    charLength?: number;
-    elapsedTime?: number;
-    name?: string;
-    utterance?: SpeechSynthesisUtterance | null;
-}
-
-interface StereoPannerOptions extends AudioNodeOptions {
-    pan?: number;
-}
-
-interface StoreExceptionsInformation extends ExceptionInformation {
-    detailURI?: string | null;
-    explanationString?: string | null;
-    siteName?: string | null;
-}
-
-interface StoreSiteSpecificExceptionsInformation extends StoreExceptionsInformation {
-    arrayOfDomainStrings?: string[];
-}
-
-interface SyncEventInit extends ExtendableEventInit {
-    lastChance?: boolean;
-    tag: string;
-}
-
-interface TextDecodeOptions {
-    stream?: boolean;
-}
-
-interface TextDecoderOptions {
-    fatal?: boolean;
-    ignoreBOM?: boolean;
-}
-
-interface TrackEventInit extends EventInit {
-    track?: VideoTrack | AudioTrack | TextTrack | null;
-}
-
-interface TransitionEventInit extends EventInit {
-    elapsedTime?: number;
-    propertyName?: string;
-}
-
-interface UIEventInit extends EventInit {
-    detail?: number;
-    view?: Window | null;
-}
-
-interface UnderlyingSink {
-    abort?: WritableStreamErrorCallback;
-    close?: WritableStreamDefaultControllerCallback;
-    start: WritableStreamDefaultControllerCallback;
-    write?: WritableStreamChunkCallback;
-}
-
-interface VRDisplayEventInit extends EventInit {
-    display: VRDisplay;
-    reason?: VRDisplayEventReason;
-}
-
-interface VRLayer {
-    leftBounds?: number[] | null;
-    rightBounds?: number[] | null;
-    source?: HTMLCanvasElement | null;
-}
-
-interface VRStageParameters {
-    sittingToStandingTransform?: Float32Array;
-    sizeX?: number;
-    sizeY?: number;
-}
-
-interface WaveShaperOptions extends AudioNodeOptions {
-    curve?: number[];
-    oversample?: OverSampleType;
-}
-
-interface WebAuthnExtensions {
-}
-
-interface WebGLContextAttributes {
-    alpha?: boolean;
-    antialias?: boolean;
-    depth?: boolean;
-    failIfMajorPerformanceCaveat?: boolean;
-    premultipliedAlpha?: boolean;
-    preserveDrawingBuffer?: boolean;
-    stencil?: boolean;
-}
-
-interface WebGLContextEventInit extends EventInit {
-    statusMessage?: string;
-}
-
-interface WheelEventInit extends MouseEventInit {
-    deltaMode?: number;
-    deltaX?: number;
-    deltaY?: number;
-    deltaZ?: number;
-}
-
-interface EventListener {
-    (evt: Event): void;
-}
-
-type WebKitEntriesCallback = ((entries: WebKitEntry[]) => void) | { handleEvent(entries: WebKitEntry[]): void; };
-
-type WebKitErrorCallback = ((err: DOMError) => void) | { handleEvent(err: DOMError): void; };
-
-type WebKitFileCallback = ((file: File) => void) | { handleEvent(file: File): void; };
-
-interface ANGLE_instanced_arrays {
-    drawArraysInstancedANGLE(mode: number, first: number, count: number, primcount: number): void;
-    drawElementsInstancedANGLE(mode: number, count: number, type: number, offset: number, primcount: number): void;
-    vertexAttribDivisorANGLE(index: number, divisor: number): void;
-    readonly VERTEX_ATTRIB_ARRAY_DIVISOR_ANGLE: number;
-}
-
-declare var ANGLE_instanced_arrays: {
-    prototype: ANGLE_instanced_arrays;
-    new(): ANGLE_instanced_arrays;
-    readonly VERTEX_ATTRIB_ARRAY_DIVISOR_ANGLE: number;
-};
-
-interface AbortController {
-    readonly signal: AbortSignal;
-    abort(): void;
-}
-
-declare var AbortController: {
-    prototype: AbortController;
-    new(): AbortController;
-};
-
-interface AbortSignalEventMap {
-    "abort": ProgressEvent;
-}
-
-interface AbortSignal extends EventTarget {
-    readonly aborted: boolean;
-    onabort: ((this: AbortSignal, ev: ProgressEvent) => any) | null;
-    addEventListener<K extends keyof AbortSignalEventMap>(type: K, listener: (this: AbortSignal, ev: AbortSignalEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof AbortSignalEventMap>(type: K, listener: (this: AbortSignal, ev: AbortSignalEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var AbortSignal: {
-    prototype: AbortSignal;
-    new(): AbortSignal;
-};
-
-interface AbstractWorkerEventMap {
-    "error": ErrorEvent;
-}
-
-interface AbstractWorker {
-    onerror: ((this: AbstractWorker, ev: ErrorEvent) => any) | null;
-    addEventListener<K extends keyof AbstractWorkerEventMap>(type: K, listener: (this: AbstractWorker, ev: AbstractWorkerEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof AbstractWorkerEventMap>(type: K, listener: (this: AbstractWorker, ev: AbstractWorkerEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-interface AesCfbParams extends Algorithm {
-    iv: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer;
-}
-
-interface AesCmacParams extends Algorithm {
-    length: number;
-}
-
-interface AnalyserNode extends AudioNode {
-    fftSize: number;
-    readonly frequencyBinCount: number;
-    maxDecibels: number;
-    minDecibels: number;
-    smoothingTimeConstant: number;
-    getByteFrequencyData(array: Uint8Array): void;
-    getByteTimeDomainData(array: Uint8Array): void;
-    getFloatFrequencyData(array: Float32Array): void;
-    getFloatTimeDomainData(array: Float32Array): void;
-}
-
-declare var AnalyserNode: {
-    prototype: AnalyserNode;
-    new(): AnalyserNode;
-};
-
-interface Animation {
-    currentTime: number | null;
-    effect: AnimationEffectReadOnly;
-    readonly finished: Promise<Animation>;
-    id: string;
-    readonly pending: boolean;
-    readonly playState: "idle" | "running" | "paused" | "finished";
-    playbackRate: number;
-    readonly ready: Promise<Animation>;
-    startTime: number;
-    timeline: AnimationTimeline;
-    cancel(): void;
-    finish(): void;
-    oncancel: (this: Animation, ev: AnimationPlaybackEvent) => any;
-    onfinish: (this: Animation, ev: AnimationPlaybackEvent) => any;
-    pause(): void;
-    play(): void;
-    reverse(): void;
-}
-
-declare var Animation: {
-    prototype: Animation;
-    new(effect?: AnimationEffectReadOnly, timeline?: AnimationTimeline): Animation;
-};
-
-interface AnimationEffectReadOnly {
-    readonly timing: number;
-    getComputedTiming(): ComputedTimingProperties;
-}
-
-interface AnimationEvent extends Event {
-    readonly animationName: string;
-    readonly elapsedTime: number;
-}
-
-declare var AnimationEvent: {
-    prototype: AnimationEvent;
-    new(typeArg: string, eventInitDict?: AnimationEventInit): AnimationEvent;
-};
-
-interface AnimationKeyFrame {
-    easing?: string | string[];
-    offset?: number | null | (number | null)[];
-    [index: string]: string | number | number[] | string[] | null | (number | null)[] | undefined;
-}
-
-interface AnimationOptions {
-    delay?: number;
-    direction?: "normal" | "reverse" | "alternate" | "alternate-reverse";
-    duration?: number;
-    easing?: string;
-    endDelay?: number;
-    fill?: "none" | "forwards" | "backwards" | "both"| "auto";
-    id?: string;
-    iterationStart?: number;
-    iterations?: number;
-}
-
-interface AnimationPlaybackEvent extends Event {
-    readonly currentTime: number | null;
-    readonly timelineTime: number | null;
-}
-
-declare var AnimationPlaybackEvent: {
-    prototype: AnimationPlaybackEvent;
-    new(type: string, eventInitDict?: AnimationPlaybackEventInit): AnimationPlaybackEvent;
-};
-
-interface AnimationPlaybackEventInit extends EventInit {
-    currentTime?: number | null;
-    timelineTime?: number | null;
-}
-
-interface AnimationTimeline {
-    readonly currentTime: number | null;
-}
-
-interface ApplicationCacheEventMap {
-    "cached": Event;
-    "checking": Event;
-    "downloading": Event;
-    "error": Event;
-    "noupdate": Event;
-    "obsolete": Event;
-    "progress": ProgressEvent;
-    "updateready": Event;
-}
-
-interface ApplicationCache extends EventTarget {
-    oncached: ((this: ApplicationCache, ev: Event) => any) | null;
-    onchecking: ((this: ApplicationCache, ev: Event) => any) | null;
-    ondownloading: ((this: ApplicationCache, ev: Event) => any) | null;
-    onerror: ((this: ApplicationCache, ev: Event) => any) | null;
-    onnoupdate: ((this: ApplicationCache, ev: Event) => any) | null;
-    onobsolete: ((this: ApplicationCache, ev: Event) => any) | null;
-    onprogress: ((this: ApplicationCache, ev: ProgressEvent) => any) | null;
-    onupdateready: ((this: ApplicationCache, ev: Event) => any) | null;
-    readonly status: number;
-    abort(): void;
-    swapCache(): void;
-    update(): void;
-    readonly CHECKING: number;
-    readonly DOWNLOADING: number;
-    readonly IDLE: number;
-    readonly OBSOLETE: number;
-    readonly UNCACHED: number;
-    readonly UPDATEREADY: number;
-    addEventListener<K extends keyof ApplicationCacheEventMap>(type: K, listener: (this: ApplicationCache, ev: ApplicationCacheEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof ApplicationCacheEventMap>(type: K, listener: (this: ApplicationCache, ev: ApplicationCacheEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var ApplicationCache: {
-    prototype: ApplicationCache;
-    new(): ApplicationCache;
-    readonly CHECKING: number;
-    readonly DOWNLOADING: number;
-    readonly IDLE: number;
-    readonly OBSOLETE: number;
-    readonly UNCACHED: number;
-    readonly UPDATEREADY: number;
-};
-
-interface AssignedNodesOptions {
-    flatten?: boolean;
-}
-
-interface Attr extends Node {
-    readonly name: string;
-    readonly ownerElement: Element | null;
-    readonly prefix: string | null;
-    readonly specified: boolean;
-    value: string;
-}
-
-declare var Attr: {
-    prototype: Attr;
-    new(): Attr;
-};
-
-interface AudioBuffer {
-    readonly duration: number;
-    readonly length: number;
-    readonly numberOfChannels: number;
-    readonly sampleRate: number;
-    copyFromChannel(destination: Float32Array, channelNumber: number, startInChannel?: number): void;
-    copyToChannel(source: Float32Array, channelNumber: number, startInChannel?: number): void;
-    getChannelData(channel: number): Float32Array;
-}
-
-declare var AudioBuffer: {
-    prototype: AudioBuffer;
-    new(): AudioBuffer;
-};
-
-interface AudioBufferSourceNodeEventMap {
-    "ended": Event;
-}
-
-interface AudioBufferSourceNode extends AudioNode {
-    buffer: AudioBuffer | null;
-    readonly detune: AudioParam;
-    loop: boolean;
-    loopEnd: number;
-    loopStart: number;
-    onended: ((this: AudioBufferSourceNode, ev: Event) => any) | null;
-    readonly playbackRate: AudioParam;
-    start(when?: number, offset?: number, duration?: number): void;
-    stop(when?: number): void;
-    addEventListener<K extends keyof AudioBufferSourceNodeEventMap>(type: K, listener: (this: AudioBufferSourceNode, ev: AudioBufferSourceNodeEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof AudioBufferSourceNodeEventMap>(type: K, listener: (this: AudioBufferSourceNode, ev: AudioBufferSourceNodeEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var AudioBufferSourceNode: {
-    prototype: AudioBufferSourceNode;
-    new(): AudioBufferSourceNode;
-};
-
-interface AudioContextEventMap {
-    "statechange": Event;
-}
-
-interface AudioContextBase extends EventTarget {
-    readonly currentTime: number;
-    readonly destination: AudioDestinationNode;
-    readonly listener: AudioListener;
-    onstatechange: ((this: AudioContext, ev: Event) => any) | null;
-    readonly sampleRate: number;
-    readonly state: AudioContextState;
-    close(): Promise<void>;
-    createAnalyser(): AnalyserNode;
-    createBiquadFilter(): BiquadFilterNode;
-    createBuffer(numberOfChannels: number, length: number, sampleRate: number): AudioBuffer;
-    createBufferSource(): AudioBufferSourceNode;
-    createChannelMerger(numberOfInputs?: number): ChannelMergerNode;
-    createChannelSplitter(numberOfOutputs?: number): ChannelSplitterNode;
-    createConvolver(): ConvolverNode;
-    createDelay(maxDelayTime?: number): DelayNode;
-    createDynamicsCompressor(): DynamicsCompressorNode;
-    createGain(): GainNode;
-    createIIRFilter(feedforward: number[], feedback: number[]): IIRFilterNode;
-    createMediaElementSource(mediaElement: HTMLMediaElement): MediaElementAudioSourceNode;
-    createMediaStreamSource(mediaStream: MediaStream): MediaStreamAudioSourceNode;
-    createOscillator(): OscillatorNode;
-    createPanner(): PannerNode;
-    createPeriodicWave(real: Float32Array, imag: Float32Array, constraints?: PeriodicWaveConstraints): PeriodicWave;
-    createScriptProcessor(bufferSize?: number, numberOfInputChannels?: number, numberOfOutputChannels?: number): ScriptProcessorNode;
-    createStereoPanner(): StereoPannerNode;
-    createWaveShaper(): WaveShaperNode;
-    decodeAudioData(audioData: ArrayBuffer, successCallback?: DecodeSuccessCallback, errorCallback?: DecodeErrorCallback): Promise<AudioBuffer>;
-    resume(): Promise<void>;
-    addEventListener<K extends keyof AudioContextEventMap>(type: K, listener: (this: AudioContext, ev: AudioContextEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof AudioContextEventMap>(type: K, listener: (this: AudioContext, ev: AudioContextEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-interface AudioContext extends AudioContextBase {
-    suspend(): Promise<void>;
-}
-
-declare var AudioContext: {
-    prototype: AudioContext;
-    new(): AudioContext;
-};
-
-interface AudioDestinationNode extends AudioNode {
-    readonly maxChannelCount: number;
-}
-
-declare var AudioDestinationNode: {
-    prototype: AudioDestinationNode;
-    new(): AudioDestinationNode;
-};
-
-interface AudioListener {
-    /** @deprecated */
-    dopplerFactor: number;
-    /** @deprecated */
-    speedOfSound: number;
-    /** @deprecated */
-    setOrientation(x: number, y: number, z: number, xUp: number, yUp: number, zUp: number): void;
-    /** @deprecated */
-    setPosition(x: number, y: number, z: number): void;
-    /** @deprecated */
-    setVelocity(x: number, y: number, z: number): void;
-}
-
-declare var AudioListener: {
-    prototype: AudioListener;
-    new(): AudioListener;
-};
-
-interface AudioNode extends EventTarget {
-    channelCount: number;
-    channelCountMode: ChannelCountMode;
-    channelInterpretation: ChannelInterpretation;
-    readonly context: AudioContext;
-    readonly numberOfInputs: number;
-    readonly numberOfOutputs: number;
-    connect(destination: AudioNode, output?: number, input?: number): AudioNode;
-    connect(destination: AudioParam, output?: number): void;
-    disconnect(): void;
-    disconnect(output: number): void;
-    disconnect(destination: AudioNode): void;
-    disconnect(destination: AudioNode, output: number): void;
-    disconnect(destination: AudioNode, output: number, input: number): void;
-    disconnect(destination: AudioParam): void;
-    disconnect(destination: AudioParam, output: number): void;
-}
-
-declare var AudioNode: {
-    prototype: AudioNode;
-    new(): AudioNode;
-};
-
-interface AudioParam {
-    readonly defaultValue: number;
-    value: number;
-    cancelScheduledValues(cancelTime: number): AudioParam;
-    exponentialRampToValueAtTime(value: number, endTime: number): AudioParam;
-    linearRampToValueAtTime(value: number, endTime: number): AudioParam;
-    setTargetAtTime(target: number, startTime: number, timeConstant: number): AudioParam;
-    setValueAtTime(value: number, startTime: number): AudioParam;
-    setValueCurveAtTime(values: number[], startTime: number, duration: number): AudioParam;
-}
-
-declare var AudioParam: {
-    prototype: AudioParam;
-    new(): AudioParam;
-};
-
-interface AudioProcessingEvent extends Event {
-    readonly inputBuffer: AudioBuffer;
-    readonly outputBuffer: AudioBuffer;
-    readonly playbackTime: number;
-}
-
-declare var AudioProcessingEvent: {
-    prototype: AudioProcessingEvent;
-    new(): AudioProcessingEvent;
-};
-
-interface AudioTrack {
-    enabled: boolean;
-    readonly id: string;
-    kind: string;
-    readonly label: string;
-    language: string;
-    readonly sourceBuffer: SourceBuffer;
-}
-
-declare var AudioTrack: {
-    prototype: AudioTrack;
-    new(): AudioTrack;
-};
-
-interface AudioTrackListEventMap {
-    "addtrack": TrackEvent;
-    "change": Event;
-    "removetrack": TrackEvent;
-}
-
-interface AudioTrackList extends EventTarget {
-    readonly length: number;
-    onaddtrack: ((this: AudioTrackList, ev: TrackEvent) => any) | null;
-    onchange: ((this: AudioTrackList, ev: Event) => any) | null;
-    onremovetrack: ((this: AudioTrackList, ev: TrackEvent) => any) | null;
-    getTrackById(id: string): AudioTrack | null;
-    item(index: number): AudioTrack;
-    addEventListener<K extends keyof AudioTrackListEventMap>(type: K, listener: (this: AudioTrackList, ev: AudioTrackListEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof AudioTrackListEventMap>(type: K, listener: (this: AudioTrackList, ev: AudioTrackListEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-    [index: number]: AudioTrack;
-}
-
-declare var AudioTrackList: {
-    prototype: AudioTrackList;
-    new(): AudioTrackList;
-};
-
-interface BarProp {
-    readonly visible: boolean;
-}
-
-declare var BarProp: {
-    prototype: BarProp;
-    new(): BarProp;
-};
-
-interface BeforeUnloadEvent extends Event {
-    returnValue: any;
-}
-
-declare var BeforeUnloadEvent: {
-    prototype: BeforeUnloadEvent;
-    new(): BeforeUnloadEvent;
-};
-
-interface BhxBrowser {
-    readonly lastError: DOMException;
-    checkMatchesGlobExpression(pattern: string, value: string): boolean;
-    checkMatchesUriExpression(pattern: string, value: string): boolean;
-    clearLastError(): void;
-    currentWindowId(): number;
-    fireExtensionApiTelemetry(functionName: string, isSucceeded: boolean, isSupported: boolean, errorString: string): void;
-    genericFunction(functionId: number, destination: any, parameters?: string, callbackId?: number): void;
-    genericSynchronousFunction(functionId: number, parameters?: string): string;
-    getExtensionId(): string;
-    getThisAddress(): any;
-    registerGenericFunctionCallbackHandler(callbackHandler: Function): void;
-    registerGenericListenerHandler(eventHandler: Function): void;
-    setLastError(parameters: string): void;
-    webPlatformGenericFunction(destination: any, parameters?: string, callbackId?: number): void;
-}
-
-declare var BhxBrowser: {
-    prototype: BhxBrowser;
-    new(): BhxBrowser;
-};
-
-interface BiquadFilterNode extends AudioNode {
-    readonly Q: AudioParam;
-    readonly detune: AudioParam;
-    readonly frequency: AudioParam;
-    readonly gain: AudioParam;
-    type: BiquadFilterType;
-    getFrequencyResponse(frequencyHz: Float32Array, magResponse: Float32Array, phaseResponse: Float32Array): void;
-}
-
-declare var BiquadFilterNode: {
-    prototype: BiquadFilterNode;
-    new(): BiquadFilterNode;
-};
-
-interface Blob {
-    readonly size: number;
-    readonly type: string;
-    msClose(): void;
-    msDetachStream(): any;
-    slice(start?: number, end?: number, contentType?: string): Blob;
-}
-
-declare var Blob: {
-    prototype: Blob;
-    new (blobParts?: any[], options?: BlobPropertyBag): Blob;
-};
-
-interface BlobPropertyBag {
-    endings?: string;
-    type?: string;
-}
-
-interface Body {
-    readonly bodyUsed: boolean;
-    arrayBuffer(): Promise<ArrayBuffer>;
-    blob(): Promise<Blob>;
-    formData(): Promise<FormData>;
-    json(): Promise<any>;
-    text(): Promise<string>;
-}
-
-interface BroadcastChannel extends EventTarget {
-    readonly name: string;
-    onmessage: (ev: MessageEvent) => any;
-    onmessageerror: (ev: MessageEvent) => any;
-    addEventListener<K extends keyof BroadcastChannelEventMap>(type: K, listener: (this: BroadcastChannel, ev: BroadcastChannelEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    close(): void;
-    postMessage(message: any): void;
-    removeEventListener<K extends keyof BroadcastChannelEventMap>(type: K, listener: (this: BroadcastChannel, ev: BroadcastChannelEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var BroadcastChannel: {
-    prototype: BroadcastChannel;
-    new(name: string): BroadcastChannel;
-};
-
-interface BroadcastChannelEventMap {
-    message: MessageEvent;
-    messageerror: MessageEvent;
-}
-
-interface ByteLengthQueuingStrategy {
-    highWaterMark: number;
-    size(chunk?: any): number;
-}
-
-declare var ByteLengthQueuingStrategy: {
-    prototype: ByteLengthQueuingStrategy;
-    new(strategy: QueuingStrategy): ByteLengthQueuingStrategy;
-};
-
-interface CDATASection extends Text {
-}
-
-declare var CDATASection: {
-    prototype: CDATASection;
-    new(): CDATASection;
-};
-
-interface CSS {
-    escape(value: string): string;
-    supports(property: string, value?: string): boolean;
-}
-declare var CSS: CSS;
-
-interface CSSConditionRule extends CSSGroupingRule {
-    conditionText: string;
-}
-
-declare var CSSConditionRule: {
-    prototype: CSSConditionRule;
-    new(): CSSConditionRule;
-};
-
-interface CSSFontFaceRule extends CSSRule {
-    readonly style: CSSStyleDeclaration;
-}
-
-declare var CSSFontFaceRule: {
-    prototype: CSSFontFaceRule;
-    new(): CSSFontFaceRule;
-};
-
-interface CSSGroupingRule extends CSSRule {
-    readonly cssRules: CSSRuleList;
-    deleteRule(index: number): void;
-    insertRule(rule: string, index: number): number;
-}
-
-declare var CSSGroupingRule: {
-    prototype: CSSGroupingRule;
-    new(): CSSGroupingRule;
-};
-
-interface CSSImportRule extends CSSRule {
-    readonly href: string;
-    readonly media: MediaList;
-    readonly styleSheet: CSSStyleSheet;
-}
-
-declare var CSSImportRule: {
-    prototype: CSSImportRule;
-    new(): CSSImportRule;
-};
-
-interface CSSKeyframeRule extends CSSRule {
-    keyText: string;
-    readonly style: CSSStyleDeclaration;
-}
-
-declare var CSSKeyframeRule: {
-    prototype: CSSKeyframeRule;
-    new(): CSSKeyframeRule;
-};
-
-interface CSSKeyframesRule extends CSSRule {
-    readonly cssRules: CSSRuleList;
-    name: string;
-    appendRule(rule: string): void;
-    deleteRule(rule: string): void;
-    findRule(rule: string): CSSKeyframeRule | null;
-}
-
-declare var CSSKeyframesRule: {
-    prototype: CSSKeyframesRule;
-    new(): CSSKeyframesRule;
-};
-
-interface CSSMediaRule extends CSSConditionRule {
-    readonly media: MediaList;
-}
-
-declare var CSSMediaRule: {
-    prototype: CSSMediaRule;
-    new(): CSSMediaRule;
-};
-
-interface CSSNamespaceRule extends CSSRule {
-    readonly namespaceURI: string;
-    readonly prefix: string;
-}
-
-declare var CSSNamespaceRule: {
-    prototype: CSSNamespaceRule;
-    new(): CSSNamespaceRule;
-};
-
-interface CSSPageRule extends CSSRule {
-    readonly pseudoClass: string;
-    readonly selector: string;
-    selectorText: string;
-    readonly style: CSSStyleDeclaration;
-}
-
-declare var CSSPageRule: {
-    prototype: CSSPageRule;
-    new(): CSSPageRule;
-};
-
-interface CSSRule {
-    cssText: string;
-    readonly parentRule: CSSRule | null;
-    readonly parentStyleSheet: CSSStyleSheet | null;
-    readonly type: number;
-    readonly CHARSET_RULE: number;
-    readonly FONT_FACE_RULE: number;
-    readonly IMPORT_RULE: number;
-    readonly KEYFRAMES_RULE: number;
-    readonly KEYFRAME_RULE: number;
-    readonly MEDIA_RULE: number;
-    readonly NAMESPACE_RULE: number;
-    readonly PAGE_RULE: number;
-    readonly STYLE_RULE: number;
-    readonly SUPPORTS_RULE: number;
-    readonly UNKNOWN_RULE: number;
-    readonly VIEWPORT_RULE: number;
-}
-
-declare var CSSRule: {
-    prototype: CSSRule;
-    new(): CSSRule;
-    readonly CHARSET_RULE: number;
-    readonly FONT_FACE_RULE: number;
-    readonly IMPORT_RULE: number;
-    readonly KEYFRAMES_RULE: number;
-    readonly KEYFRAME_RULE: number;
-    readonly MEDIA_RULE: number;
-    readonly NAMESPACE_RULE: number;
-    readonly PAGE_RULE: number;
-    readonly STYLE_RULE: number;
-    readonly SUPPORTS_RULE: number;
-    readonly UNKNOWN_RULE: number;
-    readonly VIEWPORT_RULE: number;
-};
-
-interface CSSRuleList {
-    readonly length: number;
-    item(index: number): CSSRule | null;
-    [index: number]: CSSRule;
-}
-
-declare var CSSRuleList: {
-    prototype: CSSRuleList;
-    new(): CSSRuleList;
-};
-
-interface CSSStyleDeclaration {
-    alignContent: string | null;
-    alignItems: string | null;
-    alignSelf: string | null;
-    alignmentBaseline: string | null;
-    animation: string | null;
-    animationDelay: string | null;
-    animationDirection: string | null;
-    animationDuration: string | null;
-    animationFillMode: string | null;
-    animationIterationCount: string | null;
-    animationName: string | null;
-    animationPlayState: string | null;
-    animationTimingFunction: string | null;
-    backfaceVisibility: string | null;
-    background: string | null;
-    backgroundAttachment: string | null;
-    backgroundClip: string | null;
-    backgroundColor: string | null;
-    backgroundImage: string | null;
-    backgroundOrigin: string | null;
-    backgroundPosition: string | null;
-    backgroundPositionX: string | null;
-    backgroundPositionY: string | null;
-    backgroundRepeat: string | null;
-    backgroundSize: string | null;
-    baselineShift: string | null;
-    border: string | null;
-    borderBottom: string | null;
-    borderBottomColor: string | null;
-    borderBottomLeftRadius: string | null;
-    borderBottomRightRadius: string | null;
-    borderBottomStyle: string | null;
-    borderBottomWidth: string | null;
-    borderCollapse: string | null;
-    borderColor: string | null;
-    borderImage: string | null;
-    borderImageOutset: string | null;
-    borderImageRepeat: string | null;
-    borderImageSlice: string | null;
-    borderImageSource: string | null;
-    borderImageWidth: string | null;
-    borderLeft: string | null;
-    borderLeftColor: string | null;
-    borderLeftStyle: string | null;
-    borderLeftWidth: string | null;
-    borderRadius: string | null;
-    borderRight: string | null;
-    borderRightColor: string | null;
-    borderRightStyle: string | null;
-    borderRightWidth: string | null;
-    borderSpacing: string | null;
-    borderStyle: string | null;
-    borderTop: string | null;
-    borderTopColor: string | null;
-    borderTopLeftRadius: string | null;
-    borderTopRightRadius: string | null;
-    borderTopStyle: string | null;
-    borderTopWidth: string | null;
-    borderWidth: string | null;
-    bottom: string | null;
-    boxShadow: string | null;
-    boxSizing: string | null;
-    breakAfter: string | null;
-    breakBefore: string | null;
-    breakInside: string | null;
-    captionSide: string | null;
-    clear: string | null;
-    clip: string | null;
-    clipPath: string | null;
-    clipRule: string | null;
-    color: string | null;
-    colorInterpolationFilters: string | null;
-    columnCount: any;
-    columnFill: string | null;
-    columnGap: any;
-    columnRule: string | null;
-    columnRuleColor: any;
-    columnRuleStyle: string | null;
-    columnRuleWidth: any;
-    columnSpan: string | null;
-    columnWidth: any;
-    columns: string | null;
-    content: string | null;
-    counterIncrement: string | null;
-    counterReset: string | null;
-    cssFloat: string | null;
-    cssText: string;
-    cursor: string | null;
-    direction: string | null;
-    display: string | null;
-    dominantBaseline: string | null;
-    emptyCells: string | null;
-    enableBackground: string | null;
-    fill: string | null;
-    fillOpacity: string | null;
-    fillRule: string | null;
-    filter: string | null;
-    flex: string | null;
-    flexBasis: string | null;
-    flexDirection: string | null;
-    flexFlow: string | null;
-    flexGrow: string | null;
-    flexShrink: string | null;
-    flexWrap: string | null;
-    floodColor: string | null;
-    floodOpacity: string | null;
-    font: string | null;
-    fontFamily: string | null;
-    fontFeatureSettings: string | null;
-    fontSize: string | null;
-    fontSizeAdjust: string | null;
-    fontStretch: string | null;
-    fontStyle: string | null;
-    fontVariant: string | null;
-    fontWeight: string | null;
-    gap: string | null;
-    glyphOrientationHorizontal: string | null;
-    glyphOrientationVertical: string | null;
-    grid: string | null;
-    gridArea: string | null;
-    gridAutoColumns: string | null;
-    gridAutoFlow: string | null;
-    gridAutoRows: string | null;
-    gridColumn: string | null;
-    gridColumnEnd: string | null;
-    gridColumnGap: string | null;
-    gridColumnStart: string | null;
-    gridGap: string | null;
-    gridRow: string | null;
-    gridRowEnd: string | null;
-    gridRowGap: string | null;
-    gridRowStart: string | null;
-    gridTemplate: string | null;
-    gridTemplateAreas: string | null;
-    gridTemplateColumns: string | null;
-    gridTemplateRows: string | null;
-    height: string | null;
-    imeMode: string | null;
-    justifyContent: string | null;
-    justifyItems: string | null;
-    justifySelf: string | null;
-    kerning: string | null;
-    layoutGrid: string | null;
-    layoutGridChar: string | null;
-    layoutGridLine: string | null;
-    layoutGridMode: string | null;
-    layoutGridType: string | null;
-    left: string | null;
-    readonly length: number;
-    letterSpacing: string | null;
-    lightingColor: string | null;
-    lineBreak: string | null;
-    lineHeight: string | null;
-    listStyle: string | null;
-    listStyleImage: string | null;
-    listStylePosition: string | null;
-    listStyleType: string | null;
-    margin: string | null;
-    marginBottom: string | null;
-    marginLeft: string | null;
-    marginRight: string | null;
-    marginTop: string | null;
-    marker: string | null;
-    markerEnd: string | null;
-    markerMid: string | null;
-    markerStart: string | null;
-    mask: string | null;
-    maskImage: string | null;
-    maxHeight: string | null;
-    maxWidth: string | null;
-    minHeight: string | null;
-    minWidth: string | null;
-    msContentZoomChaining: string | null;
-    msContentZoomLimit: string | null;
-    msContentZoomLimitMax: any;
-    msContentZoomLimitMin: any;
-    msContentZoomSnap: string | null;
-    msContentZoomSnapPoints: string | null;
-    msContentZoomSnapType: string | null;
-    msContentZooming: string | null;
-    msFlowFrom: string | null;
-    msFlowInto: string | null;
-    msFontFeatureSettings: string | null;
-    msGridColumn: any;
-    msGridColumnAlign: string | null;
-    msGridColumnSpan: any;
-    msGridColumns: string | null;
-    msGridRow: any;
-    msGridRowAlign: string | null;
-    msGridRowSpan: any;
-    msGridRows: string | null;
-    msHighContrastAdjust: string | null;
-    msHyphenateLimitChars: string | null;
-    msHyphenateLimitLines: any;
-    msHyphenateLimitZone: any;
-    msHyphens: string | null;
-    msImeAlign: string | null;
-    msOverflowStyle: string | null;
-    msScrollChaining: string | null;
-    msScrollLimit: string | null;
-    msScrollLimitXMax: any;
-    msScrollLimitXMin: any;
-    msScrollLimitYMax: any;
-    msScrollLimitYMin: any;
-    msScrollRails: string | null;
-    msScrollSnapPointsX: string | null;
-    msScrollSnapPointsY: string | null;
-    msScrollSnapType: string | null;
-    msScrollSnapX: string | null;
-    msScrollSnapY: string | null;
-    msScrollTranslation: string | null;
-    msTextCombineHorizontal: string | null;
-    msTextSizeAdjust: any;
-    msTouchAction: string | null;
-    msTouchSelect: string | null;
-    msUserSelect: string | null;
-    msWrapFlow: string;
-    msWrapMargin: any;
-    msWrapThrough: string;
-    objectFit: string | null;
-    objectPosition: string | null;
-    opacity: string | null;
-    order: string | null;
-    orphans: string | null;
-    outline: string | null;
-    outlineColor: string | null;
-    outlineOffset: string | null;
-    outlineStyle: string | null;
-    outlineWidth: string | null;
-    overflow: string | null;
-    overflowX: string | null;
-    overflowY: string | null;
-    padding: string | null;
-    paddingBottom: string | null;
-    paddingLeft: string | null;
-    paddingRight: string | null;
-    paddingTop: string | null;
-    pageBreakAfter: string | null;
-    pageBreakBefore: string | null;
-    pageBreakInside: string | null;
-    readonly parentRule: CSSRule;
-    penAction: string | null;
-    perspective: string | null;
-    perspectiveOrigin: string | null;
-    pointerEvents: string | null;
-    position: string | null;
-    quotes: string | null;
-    resize: string | null;
-    right: string | null;
-    rotate: string | null;
-    rowGap: string | null;
-    rubyAlign: string | null;
-    rubyOverhang: string | null;
-    rubyPosition: string | null;
-    scale: string | null;
-    stopColor: string | null;
-    stopOpacity: string | null;
-    stroke: string | null;
-    strokeDasharray: string | null;
-    strokeDashoffset: string | null;
-    strokeLinecap: string | null;
-    strokeLinejoin: string | null;
-    strokeMiterlimit: string | null;
-    strokeOpacity: string | null;
-    strokeWidth: string | null;
-    tableLayout: string | null;
-    textAlign: string | null;
-    textAlignLast: string | null;
-    textAnchor: string | null;
-    textCombineUpright: string | null;
-    textDecoration: string | null;
-    textIndent: string | null;
-    textJustify: string | null;
-    textKashida: string | null;
-    textKashidaSpace: string | null;
-    textOverflow: string | null;
-    textShadow: string | null;
-    textTransform: string | null;
-    textUnderlinePosition: string | null;
-    top: string | null;
-    touchAction: string | null;
-    transform: string | null;
-    transformOrigin: string | null;
-    transformStyle: string | null;
-    transition: string | null;
-    transitionDelay: string | null;
-    transitionDuration: string | null;
-    transitionProperty: string | null;
-    transitionTimingFunction: string | null;
-    translate: string | null;
-    unicodeBidi: string | null;
-    userSelect: string | null;
-    verticalAlign: string | null;
-    visibility: string | null;
-    webkitAlignContent: string | null;
-    webkitAlignItems: string | null;
-    webkitAlignSelf: string | null;
-    webkitAnimation: string | null;
-    webkitAnimationDelay: string | null;
-    webkitAnimationDirection: string | null;
-    webkitAnimationDuration: string | null;
-    webkitAnimationFillMode: string | null;
-    webkitAnimationIterationCount: string | null;
-    webkitAnimationName: string | null;
-    webkitAnimationPlayState: string | null;
-    webkitAnimationTimingFunction: string | null;
-    webkitAppearance: string | null;
-    webkitBackfaceVisibility: string | null;
-    webkitBackgroundClip: string | null;
-    webkitBackgroundOrigin: string | null;
-    webkitBackgroundSize: string | null;
-    webkitBorderBottomLeftRadius: string | null;
-    webkitBorderBottomRightRadius: string | null;
-    webkitBorderImage: string | null;
-    webkitBorderRadius: string | null;
-    webkitBorderTopLeftRadius: string | null;
-    webkitBorderTopRightRadius: string | null;
-    webkitBoxAlign: string | null;
-    webkitBoxDirection: string | null;
-    webkitBoxFlex: string | null;
-    webkitBoxOrdinalGroup: string | null;
-    webkitBoxOrient: string | null;
-    webkitBoxPack: string | null;
-    webkitBoxSizing: string | null;
-    webkitColumnBreakAfter: string | null;
-    webkitColumnBreakBefore: string | null;
-    webkitColumnBreakInside: string | null;
-    webkitColumnCount: any;
-    webkitColumnGap: any;
-    webkitColumnRule: string | null;
-    webkitColumnRuleColor: any;
-    webkitColumnRuleStyle: string | null;
-    webkitColumnRuleWidth: any;
-    webkitColumnSpan: string | null;
-    webkitColumnWidth: any;
-    webkitColumns: string | null;
-    webkitFilter: string | null;
-    webkitFlex: string | null;
-    webkitFlexBasis: string | null;
-    webkitFlexDirection: string | null;
-    webkitFlexFlow: string | null;
-    webkitFlexGrow: string | null;
-    webkitFlexShrink: string | null;
-    webkitFlexWrap: string | null;
-    webkitJustifyContent: string | null;
-    webkitOrder: string | null;
-    webkitPerspective: string | null;
-    webkitPerspectiveOrigin: string | null;
-    webkitTapHighlightColor: string | null;
-    webkitTextFillColor: string | null;
-    webkitTextSizeAdjust: any;
-    webkitTextStroke: string | null;
-    webkitTextStrokeColor: string | null;
-    webkitTextStrokeWidth: string | null;
-    webkitTransform: string | null;
-    webkitTransformOrigin: string | null;
-    webkitTransformStyle: string | null;
-    webkitTransition: string | null;
-    webkitTransitionDelay: string | null;
-    webkitTransitionDuration: string | null;
-    webkitTransitionProperty: string | null;
-    webkitTransitionTimingFunction: string | null;
-    webkitUserModify: string | null;
-    webkitUserSelect: string | null;
-    webkitWritingMode: string | null;
-    whiteSpace: string | null;
-    widows: string | null;
-    width: string | null;
-    wordBreak: string | null;
-    wordSpacing: string | null;
-    wordWrap: string | null;
-    writingMode: string | null;
-    zIndex: string | null;
-    zoom: string | null;
-    getPropertyPriority(propertyName: string): string;
-    getPropertyValue(propertyName: string): string;
-    item(index: number): string;
-    removeProperty(propertyName: string): string;
-    setProperty(propertyName: string, value: string | null, priority?: string | null): void;
-    [index: number]: string;
-}
-
-declare var CSSStyleDeclaration: {
-    prototype: CSSStyleDeclaration;
-    new(): CSSStyleDeclaration;
-};
-
-interface CSSStyleRule extends CSSRule {
-    selectorText: string;
-    readonly style: CSSStyleDeclaration;
-}
-
-declare var CSSStyleRule: {
-    prototype: CSSStyleRule;
-    new(): CSSStyleRule;
-};
-
-interface CSSStyleSheet extends StyleSheet {
-    readonly cssRules: CSSRuleList;
-    /** @deprecated */
-    cssText: string;
-    /** @deprecated */
-    readonly id: string;
-    /** @deprecated */
-    readonly imports: StyleSheetList;
-    /** @deprecated */
-    readonly isAlternate: boolean;
-    /** @deprecated */
-    readonly isPrefAlternate: boolean;
-    readonly ownerRule: CSSRule | null;
-    /** @deprecated */
-    readonly owningElement: Element;
-    /** @deprecated */
-    readonly pages: any;
-    /** @deprecated */
-    readonly readOnly: boolean;
-    readonly rules: CSSRuleList;
-    /** @deprecated */
-    addImport(bstrURL: string, lIndex?: number): number;
-    /** @deprecated */
-    addPageRule(bstrSelector: string, bstrStyle: string, lIndex?: number): number;
-    addRule(bstrSelector: string, bstrStyle?: string, lIndex?: number): number;
-    deleteRule(index?: number): void;
-    insertRule(rule: string, index?: number): number;
-    /** @deprecated */
-    removeImport(lIndex: number): void;
-    removeRule(lIndex: number): void;
-}
-
-declare var CSSStyleSheet: {
-    prototype: CSSStyleSheet;
-    new(): CSSStyleSheet;
-};
-
-interface CSSSupportsRule extends CSSConditionRule {
-}
-
-declare var CSSSupportsRule: {
-    prototype: CSSSupportsRule;
-    new(): CSSSupportsRule;
-};
-
-interface Cache {
-    add(request: Request | string): Promise<void>;
-    addAll(requests: (Request | string)[]): Promise<void>;
-    delete(request: Request | string, options?: CacheQueryOptions): Promise<boolean>;
-    keys(request?: Request | string, options?: CacheQueryOptions): Promise<Request[]>;
-    match(request: Request | string, options?: CacheQueryOptions): Promise<Response>;
-    matchAll(request?: Request | string, options?: CacheQueryOptions): Promise<Response[]>;
-    put(request: Request | string, response: Response): Promise<void>;
-}
-
-declare var Cache: {
-    prototype: Cache;
-    new(): Cache;
-};
-
-interface CacheStorage {
-    delete(cacheName: string): Promise<boolean>;
-    has(cacheName: string): Promise<boolean>;
-    keys(): Promise<string[]>;
-    match(request: Request | string, options?: CacheQueryOptions): Promise<any>;
-    open(cacheName: string): Promise<Cache>;
-}
-
-declare var CacheStorage: {
-    prototype: CacheStorage;
-    new(): CacheStorage;
-};
-
-interface Canvas2DContextAttributes {
-    alpha?: boolean;
-    storage?: boolean;
-    willReadFrequently?: boolean;
-    [attribute: string]: boolean | string | undefined;
-}
-
-interface CanvasGradient {
-    addColorStop(offset: number, color: string): void;
-}
-
-declare var CanvasGradient: {
-    prototype: CanvasGradient;
-    new(): CanvasGradient;
-};
-
-interface CanvasPathMethods {
-    arc(x: number, y: number, radius: number, startAngle: number, endAngle: number, anticlockwise?: boolean): void;
-    arcTo(x1: number, y1: number, x2: number, y2: number, radius: number): void;
-    arcTo(x1: number, y1: number, x2: number, y2: number, radiusX: number, radiusY: number, rotation: number): void;
-    bezierCurveTo(cp1x: number, cp1y: number, cp2x: number, cp2y: number, x: number, y: number): void;
-    closePath(): void;
-    ellipse(x: number, y: number, radiusX: number, radiusY: number, rotation: number, startAngle: number, endAngle: number, anticlockwise?: boolean): void;
-    lineTo(x: number, y: number): void;
-    moveTo(x: number, y: number): void;
-    quadraticCurveTo(cpx: number, cpy: number, x: number, y: number): void;
-    rect(x: number, y: number, w: number, h: number): void;
-}
-
-interface CanvasPattern {
-    setTransform(matrix: SVGMatrix): void;
-}
-
-declare var CanvasPattern: {
-    prototype: CanvasPattern;
-    new(): CanvasPattern;
-};
-
-interface CanvasRenderingContext2D extends CanvasPathMethods {
-    readonly canvas: HTMLCanvasElement;
-    fillStyle: string | CanvasGradient | CanvasPattern;
-    font: string;
-    globalAlpha: number;
-    globalCompositeOperation: string;
-    imageSmoothingEnabled: boolean;
-    lineCap: string;
-    lineDashOffset: number;
-    lineJoin: string;
-    lineWidth: number;
-    miterLimit: number;
-    mozImageSmoothingEnabled: boolean;
-    msFillRule: CanvasFillRule;
-    oImageSmoothingEnabled: boolean;
-    shadowBlur: number;
-    shadowColor: string;
-    shadowOffsetX: number;
-    shadowOffsetY: number;
-    strokeStyle: string | CanvasGradient | CanvasPattern;
-    textAlign: string;
-    textBaseline: string;
-    webkitImageSmoothingEnabled: boolean;
-    beginPath(): void;
-    clearRect(x: number, y: number, w: number, h: number): void;
-    clip(fillRule?: CanvasFillRule): void;
-    clip(path: Path2D, fillRule?: CanvasFillRule): void;
-    createImageData(imageDataOrSw: number | ImageData, sh?: number): ImageData;
-    createLinearGradient(x0: number, y0: number, x1: number, y1: number): CanvasGradient;
-    createPattern(image: HTMLImageElement | HTMLCanvasElement | HTMLVideoElement, repetition: string): CanvasPattern;
-    createRadialGradient(x0: number, y0: number, r0: number, x1: number, y1: number, r1: number): CanvasGradient;
-    drawFocusIfNeeded(element: Element): void;
-    drawFocusIfNeeded(path: Path2D, element: Element): void;
-    drawImage(image: HTMLImageElement | HTMLCanvasElement | HTMLVideoElement | ImageBitmap, dstX: number, dstY: number): void;
-    drawImage(image: HTMLImageElement | HTMLCanvasElement | HTMLVideoElement | ImageBitmap, dstX: number, dstY: number, dstW: number, dstH: number): void;
-    drawImage(image: HTMLImageElement | HTMLCanvasElement | HTMLVideoElement | ImageBitmap, srcX: number, srcY: number, srcW: number, srcH: number, dstX: number, dstY: number, dstW: number, dstH: number): void;
-    fill(fillRule?: CanvasFillRule): void;
-    fill(path: Path2D, fillRule?: CanvasFillRule): void;
-    fillRect(x: number, y: number, w: number, h: number): void;
-    fillText(text: string, x: number, y: number, maxWidth?: number): void;
-    getImageData(sx: number, sy: number, sw: number, sh: number): ImageData;
-    getLineDash(): number[];
-    isPointInPath(x: number, y: number, fillRule?: CanvasFillRule): boolean;
-    isPointInPath(path: Path2D, x: number, y: number, fillRule?: CanvasFillRule): boolean;
-    isPointInStroke(x: number, y: number, fillRule?: CanvasFillRule): boolean;
-    isPointInStroke(path: Path2D, x: number, y: number, fillRule?: CanvasFillRule): boolean;
-    measureText(text: string): TextMetrics;
-    putImageData(imagedata: ImageData, dx: number, dy: number, dirtyX?: number, dirtyY?: number, dirtyWidth?: number, dirtyHeight?: number): void;
-    restore(): void;
-    rotate(angle: number): void;
-    save(): void;
-    scale(x: number, y: number): void;
-    setLineDash(segments: number[]): void;
-    setTransform(m11: number, m12: number, m21: number, m22: number, dx: number, dy: number): void;
-    stroke(path?: Path2D): void;
-    strokeRect(x: number, y: number, w: number, h: number): void;
-    strokeText(text: string, x: number, y: number, maxWidth?: number): void;
-    transform(m11: number, m12: number, m21: number, m22: number, dx: number, dy: number): void;
-    translate(x: number, y: number): void;
-}
-
-declare var CanvasRenderingContext2D: {
-    prototype: CanvasRenderingContext2D;
-    new(): CanvasRenderingContext2D;
-};
-
-interface ChannelMergerNode extends AudioNode {
-}
-
-declare var ChannelMergerNode: {
-    prototype: ChannelMergerNode;
-    new(): ChannelMergerNode;
-};
-
-interface ChannelSplitterNode extends AudioNode {
-}
-
-declare var ChannelSplitterNode: {
-    prototype: ChannelSplitterNode;
-    new(): ChannelSplitterNode;
-};
-
-interface CharacterData extends Node, ChildNode {
-    data: string;
-    readonly length: number;
-    appendData(arg: string): void;
-    deleteData(offset: number, count: number): void;
-    insertData(offset: number, arg: string): void;
-    replaceData(offset: number, count: number, arg: string): void;
-    substringData(offset: number, count: number): string;
-}
-
-declare var CharacterData: {
-    prototype: CharacterData;
-    new(): CharacterData;
-};
-
-interface ChildNode {
-    remove(): void;
-}
-
-interface ClientRect {
-    bottom: number;
-    readonly height: number;
-    left: number;
-    right: number;
-    top: number;
-    readonly width: number;
-}
-
-declare var ClientRect: {
-    prototype: ClientRect;
-    new(): ClientRect;
-};
-
-interface ClientRectList {
-    readonly length: number;
-    item(index: number): ClientRect;
-    [index: number]: ClientRect;
-}
-
-declare var ClientRectList: {
-    prototype: ClientRectList;
-    new(): ClientRectList;
-};
-
-interface ClipboardEvent extends Event {
-    readonly clipboardData: DataTransfer;
-}
-
-declare var ClipboardEvent: {
-    prototype: ClipboardEvent;
-    new(type: string, eventInitDict?: ClipboardEventInit): ClipboardEvent;
-};
-
-interface ClipboardEventInit extends EventInit {
-    data?: string;
-    dataType?: string;
-}
-
-interface CloseEvent extends Event {
-    readonly code: number;
-    readonly reason: string;
-    readonly wasClean: boolean;
-    /** @deprecated */
-    initCloseEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, wasCleanArg: boolean, codeArg: number, reasonArg: string): void;
-}
-
-declare var CloseEvent: {
-    prototype: CloseEvent;
-    new(type: string, eventInitDict?: CloseEventInit): CloseEvent;
-};
-
-interface Comment extends CharacterData {
-    text: string;
-}
-
-declare var Comment: {
-    prototype: Comment;
-    new(data?: string): Comment;
-};
-
-interface CompositionEvent extends UIEvent {
-    readonly data: string;
-    readonly locale: string;
-    initCompositionEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, dataArg: string, locale: string): void;
-}
-
-declare var CompositionEvent: {
-    prototype: CompositionEvent;
-    new(typeArg: string, eventInitDict?: CompositionEventInit): CompositionEvent;
-};
-
-interface ComputedTimingProperties {
-    activeDuration: number;
-    currentIteration: number | null;
-    endTime: number;
-    localTime: number | null;
-    progress: number | null;
-}
-
-interface ConcatParams extends Algorithm {
-    algorithmId: Uint8Array;
-    hash?: string | Algorithm;
-    partyUInfo: Uint8Array;
-    partyVInfo: Uint8Array;
-    privateInfo?: Uint8Array;
-    publicInfo?: Uint8Array;
-}
-
-interface Console {
-    memory: any;
-    assert(condition?: boolean, message?: string, ...data: any[]): void;
-    clear(): void;
-    count(label?: string): void;
-    debug(message?: any, ...optionalParams: any[]): void;
-    dir(value?: any, ...optionalParams: any[]): void;
-    dirxml(value: any): void;
-    error(message?: any, ...optionalParams: any[]): void;
-    exception(message?: string, ...optionalParams: any[]): void;
-    group(groupTitle?: string, ...optionalParams: any[]): void;
-    groupCollapsed(groupTitle?: string, ...optionalParams: any[]): void;
-    groupEnd(): void;
-    info(message?: any, ...optionalParams: any[]): void;
-    log(message?: any, ...optionalParams: any[]): void;
-    markTimeline(label?: string): void;
-    msIsIndependentlyComposed(element: Element): boolean;
-    profile(reportName?: string): void;
-    profileEnd(): void;
-    select(element: Element): void;
-    table(...tabularData: any[]): void;
-    time(label?: string): void;
-    timeEnd(label?: string): void;
-    timeStamp(label?: string): void;
-    timeline(label?: string): void;
-    timelineEnd(label?: string): void;
-    trace(message?: any, ...optionalParams: any[]): void;
-    warn(message?: any, ...optionalParams: any[]): void;
-}
-
-declare var Console: {
-    prototype: Console;
-    new(): Console;
-};
-
-interface ContentScriptGlobalScope extends EventTarget {
-    readonly msContentScript: ExtensionScriptApis;
-    readonly window: Window;
-}
-
-declare var ContentScriptGlobalScope: {
-    prototype: ContentScriptGlobalScope;
-    new(): ContentScriptGlobalScope;
-};
-
-interface ConvolverNode extends AudioNode {
-    buffer: AudioBuffer | null;
-    normalize: boolean;
-}
-
-declare var ConvolverNode: {
-    prototype: ConvolverNode;
-    new(): ConvolverNode;
-};
-
-interface Coordinates {
-    readonly accuracy: number;
-    readonly altitude: number | null;
-    readonly altitudeAccuracy: number | null;
-    readonly heading: number | null;
-    readonly latitude: number;
-    readonly longitude: number;
-    readonly speed: number | null;
-}
-
-declare var Coordinates: {
-    prototype: Coordinates;
-    new(): Coordinates;
-};
-
-interface CountQueuingStrategy {
-    highWaterMark: number;
-    size(): number;
-}
-
-declare var CountQueuingStrategy: {
-    prototype: CountQueuingStrategy;
-    new(strategy: QueuingStrategy): CountQueuingStrategy;
-};
-
-interface Crypto {
-    readonly subtle: SubtleCrypto;
-    getRandomValues(array: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | null): Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | null;
-}
-
-declare var Crypto: {
-    prototype: Crypto;
-    new(): Crypto;
-};
-
-interface CryptoKey {
-    readonly algorithm: KeyAlgorithm;
-    readonly extractable: boolean;
-    readonly type: string;
-    readonly usages: string[];
-}
-
-declare var CryptoKey: {
-    prototype: CryptoKey;
-    new(): CryptoKey;
-};
-
-interface CryptoKeyPair {
-    privateKey: CryptoKey;
-    publicKey: CryptoKey;
-}
-
-declare var CryptoKeyPair: {
-    prototype: CryptoKeyPair;
-    new(): CryptoKeyPair;
-};
-
-interface CustomElementRegistry {
-    define(name: string, constructor: Function, options?: ElementDefinitionOptions): void;
-    get(name: string): any;
-    whenDefined(name: string): PromiseLike<void>;
-}
-
-interface CustomEvent<T = any> extends Event {
-    readonly detail: T;
-    initCustomEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, detailArg: T): void;
-}
-
-declare var CustomEvent: {
-    prototype: CustomEvent;
-    new<T>(typeArg: string, eventInitDict?: CustomEventInit<T>): CustomEvent<T>;
-};
-
-interface DOMError {
-    readonly name: string;
-    toString(): string;
-}
-
-declare var DOMError: {
-    prototype: DOMError;
-    new(): DOMError;
-};
-
-interface DOMException {
-    readonly code: number;
-    readonly message: string;
-    readonly name: string;
-    toString(): string;
-    readonly ABORT_ERR: number;
-    readonly DATA_CLONE_ERR: number;
-    readonly DOMSTRING_SIZE_ERR: number;
-    readonly HIERARCHY_REQUEST_ERR: number;
-    readonly INDEX_SIZE_ERR: number;
-    readonly INUSE_ATTRIBUTE_ERR: number;
-    readonly INVALID_ACCESS_ERR: number;
-    readonly INVALID_CHARACTER_ERR: number;
-    readonly INVALID_MODIFICATION_ERR: number;
-    readonly INVALID_NODE_TYPE_ERR: number;
-    readonly INVALID_STATE_ERR: number;
-    readonly NAMESPACE_ERR: number;
-    readonly NETWORK_ERR: number;
-    readonly NOT_FOUND_ERR: number;
-    readonly NOT_SUPPORTED_ERR: number;
-    readonly NO_DATA_ALLOWED_ERR: number;
-    readonly NO_MODIFICATION_ALLOWED_ERR: number;
-    readonly PARSE_ERR: number;
-    readonly QUOTA_EXCEEDED_ERR: number;
-    readonly SECURITY_ERR: number;
-    readonly SERIALIZE_ERR: number;
-    readonly SYNTAX_ERR: number;
-    readonly TIMEOUT_ERR: number;
-    readonly TYPE_MISMATCH_ERR: number;
-    readonly URL_MISMATCH_ERR: number;
-    readonly VALIDATION_ERR: number;
-    readonly WRONG_DOCUMENT_ERR: number;
-}
-
-declare var DOMException: {
-    prototype: DOMException;
-    new(message?: string, name?: string): DOMException;
-    readonly ABORT_ERR: number;
-    readonly DATA_CLONE_ERR: number;
-    readonly DOMSTRING_SIZE_ERR: number;
-    readonly HIERARCHY_REQUEST_ERR: number;
-    readonly INDEX_SIZE_ERR: number;
-    readonly INUSE_ATTRIBUTE_ERR: number;
-    readonly INVALID_ACCESS_ERR: number;
-    readonly INVALID_CHARACTER_ERR: number;
-    readonly INVALID_MODIFICATION_ERR: number;
-    readonly INVALID_NODE_TYPE_ERR: number;
-    readonly INVALID_STATE_ERR: number;
-    readonly NAMESPACE_ERR: number;
-    readonly NETWORK_ERR: number;
-    readonly NOT_FOUND_ERR: number;
-    readonly NOT_SUPPORTED_ERR: number;
-    readonly NO_DATA_ALLOWED_ERR: number;
-    readonly NO_MODIFICATION_ALLOWED_ERR: number;
-    readonly PARSE_ERR: number;
-    readonly QUOTA_EXCEEDED_ERR: number;
-    readonly SECURITY_ERR: number;
-    readonly SERIALIZE_ERR: number;
-    readonly SYNTAX_ERR: number;
-    readonly TIMEOUT_ERR: number;
-    readonly TYPE_MISMATCH_ERR: number;
-    readonly URL_MISMATCH_ERR: number;
-    readonly VALIDATION_ERR: number;
-    readonly WRONG_DOCUMENT_ERR: number;
-};
-
-interface DOMImplementation {
-    createDocument(namespaceURI: string | null, qualifiedName: string | null, doctype: DocumentType | null): Document;
-    createDocumentType(qualifiedName: string, publicId: string, systemId: string): DocumentType;
-    createHTMLDocument(title?: string): Document;
-    hasFeature(feature: string | null, version: string | null): boolean;
-}
-
-declare var DOMImplementation: {
-    prototype: DOMImplementation;
-    new(): DOMImplementation;
-};
-
-interface DOML2DeprecatedColorProperty {
-    color: string;
-}
-
-interface DOML2DeprecatedSizeProperty {
-    size: number;
-}
-
-interface DOMParser {
-    parseFromString(source: string, mimeType: string): Document;
-}
-
-declare var DOMParser: {
-    prototype: DOMParser;
-    new(): DOMParser;
-};
-
-interface DOMRect extends DOMRectReadOnly {
-    height: number;
-    width: number;
-    x: number;
-    y: number;
-}
-
-declare var DOMRect: {
-    prototype: DOMRect;
-    new (x?: number, y?: number, width?: number, height?: number): DOMRect;
-    fromRect(rectangle?: DOMRectInit): DOMRect;
-};
-
-interface DOMRectList {
-    readonly length: number;
-    item(index: number): DOMRect | null;
-    [index: number]: DOMRect;
-}
-
-interface DOMRectReadOnly {
-    readonly bottom: number;
-    readonly height: number;
-    readonly left: number;
-    readonly right: number;
-    readonly top: number;
-    readonly width: number;
-    readonly x: number;
-    readonly y: number;
-}
-
-declare var DOMRectReadOnly: {
-    prototype: DOMRectReadOnly;
-    new (x?: number, y?: number, width?: number, height?: number): DOMRectReadOnly;
-    fromRect(rectangle?: DOMRectInit): DOMRectReadOnly;
-};
-
-interface DOMSettableTokenList extends DOMTokenList {
-    value: string;
-}
-
-declare var DOMSettableTokenList: {
-    prototype: DOMSettableTokenList;
-    new(): DOMSettableTokenList;
-};
-
-interface DOMStringList {
-    readonly length: number;
-    contains(str: string): boolean;
-    item(index: number): string | null;
-    [index: number]: string;
-}
-
-declare var DOMStringList: {
-    prototype: DOMStringList;
-    new(): DOMStringList;
-};
-
-interface DOMStringMap {
-    [name: string]: string | undefined;
-}
-
-declare var DOMStringMap: {
-    prototype: DOMStringMap;
-    new(): DOMStringMap;
-};
-
-interface DOMTokenList {
-    readonly length: number;
-    add(...tokens: string[]): void;
-    contains(token: string): boolean;
-    item(index: number): string | null;
-    remove(...tokens: string[]): void;
-    replace(oldToken: string, newToken: string): void;
-    toString(): string;
-    toggle(token: string, force?: boolean): boolean;
-    [index: number]: string;
-}
-
-declare var DOMTokenList: {
-    prototype: DOMTokenList;
-    new(): DOMTokenList;
-};
-
-interface DataCue extends TextTrackCue {
-    data: ArrayBuffer;
-    addEventListener<K extends keyof TextTrackCueEventMap>(type: K, listener: (this: DataCue, ev: TextTrackCueEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof TextTrackCueEventMap>(type: K, listener: (this: DataCue, ev: TextTrackCueEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var DataCue: {
-    prototype: DataCue;
-    new(): DataCue;
-};
-
-interface DataTransfer {
-    dropEffect: string;
-    effectAllowed: string;
-    readonly files: FileList;
-    readonly items: DataTransferItemList;
-    readonly types: string[];
-    clearData(format?: string): boolean;
-    getData(format: string): string;
-    setData(format: string, data: string): boolean;
-    setDragImage(image: Element, x: number, y: number): void;
-}
-
-declare var DataTransfer: {
-    prototype: DataTransfer;
-    new(): DataTransfer;
-};
-
-interface DataTransferItem {
-    readonly kind: string;
-    readonly type: string;
-    getAsFile(): File | null;
-    getAsString(_callback: FunctionStringCallback | null): void;
-    webkitGetAsEntry(): any;
-}
-
-declare var DataTransferItem: {
-    prototype: DataTransferItem;
-    new(): DataTransferItem;
-};
-
-interface DataTransferItemList {
-    readonly length: number;
-    add(data: File): DataTransferItem | null;
-    add(data: string, type: string): DataTransferItem | null;
-    clear(): void;
-    item(index: number): DataTransferItem;
-    remove(index: number): void;
-    [name: number]: DataTransferItem;
-}
-
-declare var DataTransferItemList: {
-    prototype: DataTransferItemList;
-    new(): DataTransferItemList;
-};
-
-interface DeferredPermissionRequest {
-    readonly id: number;
-    readonly type: MSWebViewPermissionType;
-    readonly uri: string;
-    allow(): void;
-    deny(): void;
-}
-
-declare var DeferredPermissionRequest: {
-    prototype: DeferredPermissionRequest;
-    new(): DeferredPermissionRequest;
-};
-
-interface DelayNode extends AudioNode {
-    readonly delayTime: AudioParam;
-}
-
-declare var DelayNode: {
-    prototype: DelayNode;
-    new(): DelayNode;
-};
-
-interface DeviceAcceleration {
-    readonly x: number | null;
-    readonly y: number | null;
-    readonly z: number | null;
-}
-
-declare var DeviceAcceleration: {
-    prototype: DeviceAcceleration;
-    new(): DeviceAcceleration;
-};
-
-interface DeviceLightEvent extends Event {
-    readonly value: number;
-}
-
-declare var DeviceLightEvent: {
-    prototype: DeviceLightEvent;
-    new(typeArg: string, eventInitDict?: DeviceLightEventInit): DeviceLightEvent;
-};
-
-interface DeviceMotionEvent extends Event {
-    readonly acceleration: DeviceAcceleration | null;
-    readonly accelerationIncludingGravity: DeviceAcceleration | null;
-    readonly interval: number | null;
-    readonly rotationRate: DeviceRotationRate | null;
-    initDeviceMotionEvent(type: string, bubbles: boolean, cancelable: boolean, acceleration: DeviceAccelerationDict | null, accelerationIncludingGravity: DeviceAccelerationDict | null, rotationRate: DeviceRotationRateDict | null, interval: number | null): void;
-}
-
-declare var DeviceMotionEvent: {
-    prototype: DeviceMotionEvent;
-    new(typeArg: string, eventInitDict?: DeviceMotionEventInit): DeviceMotionEvent;
-};
-
-interface DeviceOrientationEvent extends Event {
-    readonly absolute: boolean;
-    readonly alpha: number | null;
-    readonly beta: number | null;
-    readonly gamma: number | null;
-    initDeviceOrientationEvent(type: string, bubbles: boolean, cancelable: boolean, alpha: number | null, beta: number | null, gamma: number | null, absolute: boolean): void;
-}
-
-declare var DeviceOrientationEvent: {
-    prototype: DeviceOrientationEvent;
-    new(typeArg: string, eventInitDict?: DeviceOrientationEventInit): DeviceOrientationEvent;
-};
-
-interface DeviceRotationRate {
-    readonly alpha: number | null;
-    readonly beta: number | null;
-    readonly gamma: number | null;
-}
-
-declare var DeviceRotationRate: {
-    prototype: DeviceRotationRate;
-    new(): DeviceRotationRate;
-};
-
-interface DhImportKeyParams extends Algorithm {
-    generator: Uint8Array;
-    prime: Uint8Array;
-}
-
-interface DhKeyAlgorithm extends KeyAlgorithm {
-    generator: Uint8Array;
-    prime: Uint8Array;
-}
-
-interface DhKeyDeriveParams extends Algorithm {
-    public: CryptoKey;
-}
-
-interface DhKeyGenParams extends Algorithm {
-    generator: Uint8Array;
-    prime: Uint8Array;
-}
-
-interface DocumentEventMap extends GlobalEventHandlersEventMap {
-    "abort": UIEvent;
-    "activate": Event;
-    "beforeactivate": Event;
-    "beforedeactivate": Event;
-    "blur": FocusEvent;
-    "canplay": Event;
-    "canplaythrough": Event;
-    "change": Event;
-    "click": MouseEvent;
-    "contextmenu": PointerEvent;
-    "dblclick": MouseEvent;
-    "deactivate": Event;
-    "drag": DragEvent;
-    "dragend": DragEvent;
-    "dragenter": DragEvent;
-    "dragleave": DragEvent;
-    "dragover": DragEvent;
-    "dragstart": DragEvent;
-    "drop": DragEvent;
-    "durationchange": Event;
-    "emptied": Event;
-    "ended": Event;
-    "error": ErrorEvent;
-    "focus": FocusEvent;
-    "fullscreenchange": Event;
-    "fullscreenerror": Event;
-    "input": Event;
-    "invalid": Event;
-    "keydown": KeyboardEvent;
-    "keypress": KeyboardEvent;
-    "keyup": KeyboardEvent;
-    "load": Event;
-    "loadeddata": Event;
-    "loadedmetadata": Event;
-    "loadstart": Event;
-    "mousedown": MouseEvent;
-    "mousemove": MouseEvent;
-    "mouseout": MouseEvent;
-    "mouseover": MouseEvent;
-    "mouseup": MouseEvent;
-    "mousewheel": WheelEvent;
-    "MSContentZoom": Event;
-    "MSGestureChange": Event;
-    "MSGestureDoubleTap": Event;
-    "MSGestureEnd": Event;
-    "MSGestureHold": Event;
-    "MSGestureStart": Event;
-    "MSGestureTap": Event;
-    "MSInertiaStart": Event;
-    "MSManipulationStateChanged": Event;
-    "MSPointerCancel": Event;
-    "MSPointerDown": Event;
-    "MSPointerEnter": Event;
-    "MSPointerLeave": Event;
-    "MSPointerMove": Event;
-    "MSPointerOut": Event;
-    "MSPointerOver": Event;
-    "MSPointerUp": Event;
-    "mssitemodejumplistitemremoved": Event;
-    "msthumbnailclick": Event;
-    "pause": Event;
-    "play": Event;
-    "playing": Event;
-    "pointerlockchange": Event;
-    "pointerlockerror": Event;
-    "progress": ProgressEvent;
-    "ratechange": Event;
-    "readystatechange": Event;
-    "reset": Event;
-    "scroll": UIEvent;
-    "seeked": Event;
-    "seeking": Event;
-    "select": UIEvent;
-    "selectionchange": Event;
-    "selectstart": Event;
-    "stalled": Event;
-    "stop": Event;
-    "submit": Event;
-    "suspend": Event;
-    "timeupdate": Event;
-    "touchcancel": TouchEvent;
-    "touchend": TouchEvent;
-    "touchmove": TouchEvent;
-    "touchstart": TouchEvent;
-    "volumechange": Event;
-    "waiting": Event;
-    "webkitfullscreenchange": Event;
-    "webkitfullscreenerror": Event;
-}
-
-interface Document extends Node, GlobalEventHandlers, ParentNode, DocumentEvent {
-    /**
-     * Sets or gets the URL for the current document.
-     */
-    readonly URL: string;
-    /**
-     * Gets the URL for the document, stripped of any character encoding.
-     */
-    readonly URLUnencoded: string;
-    /**
-     * Gets the object that has the focus when the parent document has focus.
-     */
-    readonly activeElement: Element;
-    /**
-     * Sets or gets the color of all active links in the document.
-     */
-    alinkColor: string;
-    /**
-     * Returns a reference to the collection of elements contained by the object.
-     */
-    readonly all: HTMLAllCollection;
-    /**
-     * Retrieves a collection of all a objects that have a name and/or id property. Objects in this collection are in HTML source order.
-     */
-    readonly anchors: HTMLCollectionOf<HTMLAnchorElement>;
-    /**
-     * Retrieves a collection of all applet objects in the document.
-     */
-    readonly applets: HTMLCollectionOf<HTMLAppletElement>;
-    /**
-     * Deprecated. Sets or retrieves a value that indicates the background color behind the object.
-     */
-    bgColor: string;
-    /**
-     * Specifies the beginning and end of the document body.
-     */
-    body: HTMLElement;
-    readonly characterSet: string;
-    /**
-     * Gets or sets the character set used to encode the object.
-     */
-    charset: string;
-    /**
-     * Gets a value that indicates whether standards-compliant mode is switched on for the object.
-     */
-    readonly compatMode: string;
-    cookie: string;
-    readonly currentScript: HTMLScriptElement | SVGScriptElement | null;
-    readonly defaultView: Window;
-    /**
-     * Sets or gets a value that indicates whether the document can be edited.
-     */
-    designMode: string;
-    /**
-     * Sets or retrieves a value that indicates the reading order of the object.
-     */
-    dir: string;
-    /**
-     * Gets an object representing the document type declaration associated with the current document.
-     */
-    readonly doctype: DocumentType;
-    /**
-     * Gets a reference to the root node of the document.
-     */
-    readonly documentElement: HTMLElement;
-    /**
-     * Sets or gets the security domain of the document.
-     */
-    domain: string;
-    /**
-     * Retrieves a collection of all embed objects in the document.
-     */
-    readonly embeds: HTMLCollectionOf<HTMLEmbedElement>;
-    /**
-     * Sets or gets the foreground (text) color of the document.
-     */
-    fgColor: string;
-    /**
-     * Retrieves a collection, in source order, of all form objects in the document.
-     */
-    readonly forms: HTMLCollectionOf<HTMLFormElement>;
-    readonly fullscreenElement: Element | null;
-    readonly fullscreenEnabled: boolean;
-    readonly head: HTMLHeadElement;
-    readonly hidden: boolean;
-    /**
-     * Retrieves a collection, in source order, of img objects in the document.
-     */
-    readonly images: HTMLCollectionOf<HTMLImageElement>;
-    /**
-     * Gets the implementation object of the current document.
-     */
-    readonly implementation: DOMImplementation;
-    /**
-     * Returns the character encoding used to create the webpage that is loaded into the document object.
-     */
-    readonly inputEncoding: string | null;
-    /**
-     * Gets the date that the page was last modified, if the page supplies one.
-     */
-    readonly lastModified: string;
-    /**
-     * Sets or gets the color of the document links.
-     */
-    linkColor: string;
-    /**
-     * Retrieves a collection of all a objects that specify the href property and all area objects in the document.
-     */
-    readonly links: HTMLCollectionOf<HTMLAnchorElement | HTMLAreaElement>;
-    /**
-     * Contains information about the current URL.
-     */
-    location: Location;
-    msCSSOMElementFloatMetrics: boolean;
-    msCapsLockWarningOff: boolean;
-    /**
-     * Fires when the user aborts the download.
-     * @param ev The event.
-     */
-    onabort: ((this: Document, ev: UIEvent) => any) | null;
-    /**
-     * Fires when the object is set as the active element.
-     * @param ev The event.
-     */
-    onactivate: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires immediately before the object is set as the active element.
-     * @param ev The event.
-     */
-    onbeforeactivate: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires immediately before the activeElement is changed from the current object to another object in the parent document.
-     * @param ev The event.
-     */
-    onbeforedeactivate: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the object loses the input focus.
-     * @param ev The focus event.
-     */
-    onblur: ((this: Document, ev: FocusEvent) => any) | null;
-    /**
-     * Occurs when playback is possible, but would require further buffering.
-     * @param ev The event.
-     */
-    oncanplay: ((this: Document, ev: Event) => any) | null;
-    oncanplaythrough: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the contents of the object or selection have changed.
-     * @param ev The event.
-     */
-    onchange: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the user clicks the left mouse button on the object
-     * @param ev The mouse event.
-     */
-    onclick: ((this: Document, ev: MouseEvent) => any) | null;
-    /**
-     * Fires when the user clicks the right mouse button in the client area, opening the context menu.
-     * @param ev The mouse event.
-     */
-    oncontextmenu: ((this: Document, ev: PointerEvent) => any) | null;
-    /**
-     * Fires when the user double-clicks the object.
-     * @param ev The mouse event.
-     */
-    ondblclick: ((this: Document, ev: MouseEvent) => any) | null;
-    /**
-     * Fires when the activeElement is changed from the current object to another object in the parent document.
-     * @param ev The UI Event
-     */
-    ondeactivate: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires on the source object continuously during a drag operation.
-     * @param ev The event.
-     */
-    ondrag: ((this: Document, ev: DragEvent) => any) | null;
-    /**
-     * Fires on the source object when the user releases the mouse at the close of a drag operation.
-     * @param ev The event.
-     */
-    ondragend: ((this: Document, ev: DragEvent) => any) | null;
-    /**
-     * Fires on the target element when the user drags the object to a valid drop target.
-     * @param ev The drag event.
-     */
-    ondragenter: ((this: Document, ev: DragEvent) => any) | null;
-    /**
-     * Fires on the target object when the user moves the mouse out of a valid drop target during a drag operation.
-     * @param ev The drag event.
-     */
-    ondragleave: ((this: Document, ev: DragEvent) => any) | null;
-    /**
-     * Fires on the target element continuously while the user drags the object over a valid drop target.
-     * @param ev The event.
-     */
-    ondragover: ((this: Document, ev: DragEvent) => any) | null;
-    /**
-     * Fires on the source object when the user starts to drag a text selection or selected object.
-     * @param ev The event.
-     */
-    ondragstart: ((this: Document, ev: DragEvent) => any) | null;
-    ondrop: ((this: Document, ev: DragEvent) => any) | null;
-    /**
-     * Occurs when the duration attribute is updated.
-     * @param ev The event.
-     */
-    ondurationchange: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when the media element is reset to its initial state.
-     * @param ev The event.
-     */
-    onemptied: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when the end of playback is reached.
-     * @param ev The event
-     */
-    onended: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when an error occurs during object loading.
-     * @param ev The event.
-     */
-    onerror: ((this: Document, ev: ErrorEvent) => any) | null;
-    /**
-     * Fires when the object receives focus.
-     * @param ev The event.
-     */
-    onfocus: ((this: Document, ev: FocusEvent) => any) | null;
-    onfullscreenchange: ((this: Document, ev: Event) => any) | null;
-    onfullscreenerror: ((this: Document, ev: Event) => any) | null;
-    oninput: ((this: Document, ev: Event) => any) | null;
-    oninvalid: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the user presses a key.
-     * @param ev The keyboard event
-     */
-    onkeydown: ((this: Document, ev: KeyboardEvent) => any) | null;
-    /**
-     * Fires when the user presses an alphanumeric key.
-     * @param ev The event.
-     */
-    onkeypress: ((this: Document, ev: KeyboardEvent) => any) | null;
-    /**
-     * Fires when the user releases a key.
-     * @param ev The keyboard event
-     */
-    onkeyup: ((this: Document, ev: KeyboardEvent) => any) | null;
-    /**
-     * Fires immediately after the browser loads the object.
-     * @param ev The event.
-     */
-    onload: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when media data is loaded at the current playback position.
-     * @param ev The event.
-     */
-    onloadeddata: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when the duration and dimensions of the media have been determined.
-     * @param ev The event.
-     */
-    onloadedmetadata: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when Internet Explorer begins looking for media data.
-     * @param ev The event.
-     */
-    onloadstart: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the user clicks the object with either mouse button.
-     * @param ev The mouse event.
-     */
-    onmousedown: ((this: Document, ev: MouseEvent) => any) | null;
-    /**
-     * Fires when the user moves the mouse over the object.
-     * @param ev The mouse event.
-     */
-    onmousemove: ((this: Document, ev: MouseEvent) => any) | null;
-    /**
-     * Fires when the user moves the mouse pointer outside the boundaries of the object.
-     * @param ev The mouse event.
-     */
-    onmouseout: ((this: Document, ev: MouseEvent) => any) | null;
-    /**
-     * Fires when the user moves the mouse pointer into the object.
-     * @param ev The mouse event.
-     */
-    onmouseover: ((this: Document, ev: MouseEvent) => any) | null;
-    /**
-     * Fires when the user releases a mouse button while the mouse is over the object.
-     * @param ev The mouse event.
-     */
-    onmouseup: ((this: Document, ev: MouseEvent) => any) | null;
-    /**
-     * Fires when the wheel button is rotated.
-     * @param ev The mouse event
-     */
-    onmousewheel: ((this: Document, ev: WheelEvent) => any) | null;
-    onmscontentzoom: ((this: Document, ev: Event) => any) | null;
-    onmsgesturechange: ((this: Document, ev: Event) => any) | null;
-    onmsgesturedoubletap: ((this: Document, ev: Event) => any) | null;
-    onmsgestureend: ((this: Document, ev: Event) => any) | null;
-    onmsgesturehold: ((this: Document, ev: Event) => any) | null;
-    onmsgesturestart: ((this: Document, ev: Event) => any) | null;
-    onmsgesturetap: ((this: Document, ev: Event) => any) | null;
-    onmsinertiastart: ((this: Document, ev: Event) => any) | null;
-    onmsmanipulationstatechanged: ((this: Document, ev: Event) => any) | null;
-    onmspointercancel: ((this: Document, ev: Event) => any) | null;
-    onmspointerdown: ((this: Document, ev: Event) => any) | null;
-    onmspointerenter: ((this: Document, ev: Event) => any) | null;
-    onmspointerleave: ((this: Document, ev: Event) => any) | null;
-    onmspointermove: ((this: Document, ev: Event) => any) | null;
-    onmspointerout: ((this: Document, ev: Event) => any) | null;
-    onmspointerover: ((this: Document, ev: Event) => any) | null;
-    onmspointerup: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when an item is removed from a Jump List of a webpage running in Site Mode.
-     * @param ev The event.
-     */
-    onmssitemodejumplistitemremoved: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when a user clicks a button in a Thumbnail Toolbar of a webpage running in Site Mode.
-     * @param ev The event.
-     */
-    onmsthumbnailclick: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when playback is paused.
-     * @param ev The event.
-     */
-    onpause: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when the play method is requested.
-     * @param ev The event.
-     */
-    onplay: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when the audio or video has started playing.
-     * @param ev The event.
-     */
-    onplaying: ((this: Document, ev: Event) => any) | null;
-    onpointerlockchange: ((this: Document, ev: Event) => any) | null;
-    onpointerlockerror: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs to indicate progress while downloading media data.
-     * @param ev The event.
-     */
-    onprogress: ((this: Document, ev: ProgressEvent) => any) | null;
-    /**
-     * Occurs when the playback rate is increased or decreased.
-     * @param ev The event.
-     */
-    onratechange: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the state of the object has changed.
-     * @param ev The event
-     */
-    onreadystatechange: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the user resets a form.
-     * @param ev The event.
-     */
-    onreset: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the user repositions the scroll box in the scroll bar on the object.
-     * @param ev The event.
-     */
-    onscroll: ((this: Document, ev: UIEvent) => any) | null;
-    /**
-     * Occurs when the seek operation ends.
-     * @param ev The event.
-     */
-    onseeked: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when the current playback position is moved.
-     * @param ev The event.
-     */
-    onseeking: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the current selection changes.
-     * @param ev The event.
-     */
-    onselect: ((this: Document, ev: UIEvent) => any) | null;
-    /**
-     * Fires when the selection state of a document changes.
-     * @param ev The event.
-     */
-    onselectionchange: ((this: Document, ev: Event) => any) | null;
-    onselectstart: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when the download has stopped.
-     * @param ev The event.
-     */
-    onstalled: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the user clicks the Stop button or leaves the Web page.
-     * @param ev The event.
-     */
-    onstop: ((this: Document, ev: Event) => any) | null;
-    onsubmit: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs if the load operation has been intentionally halted.
-     * @param ev The event.
-     */
-    onsuspend: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs to indicate the current playback position.
-     * @param ev The event.
-     */
-    ontimeupdate: ((this: Document, ev: Event) => any) | null;
-    ontouchcancel: ((this: Document, ev: TouchEvent) => any) | null;
-    ontouchend: ((this: Document, ev: TouchEvent) => any) | null;
-    ontouchmove: ((this: Document, ev: TouchEvent) => any) | null;
-    ontouchstart: ((this: Document, ev: TouchEvent) => any) | null;
-    onvisibilitychange: (this: Document, ev: Event) => any;
-    /**
-     * Occurs when the volume is changed, or playback is muted or unmuted.
-     * @param ev The event.
-     */
-    onvolumechange: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when playback stops because the next frame of a video resource is not available.
-     * @param ev The event.
-     */
-    onwaiting: ((this: Document, ev: Event) => any) | null;
-    onwebkitfullscreenchange: ((this: Document, ev: Event) => any) | null;
-    onwebkitfullscreenerror: ((this: Document, ev: Event) => any) | null;
-    readonly plugins: HTMLCollectionOf<HTMLEmbedElement>;
-    readonly pointerLockElement: Element;
-    /**
-     * Retrieves a value that indicates the current state of the object.
-     */
-    readonly readyState: DocumentReadyState;
-    /**
-     * Gets the URL of the location that referred the user to the current page.
-     */
-    readonly referrer: string;
-    /**
-     * Gets the root svg element in the document hierarchy.
-     */
-    readonly rootElement: SVGSVGElement;
-    /**
-     * Retrieves a collection of all script objects in the document.
-     */
-    readonly scripts: HTMLCollectionOf<HTMLScriptElement>;
-    readonly scrollingElement: Element | null;
-    /**
-     * Retrieves a collection of styleSheet objects representing the style sheets that correspond to each instance of a link or style object in the document.
-     */
-    readonly styleSheets: StyleSheetList;
-    /**
-     * Contains the title of the document.
-     */
-    title: string;
-    readonly visibilityState: VisibilityState;
-    /**
-     * Sets or gets the color of the links that the user has visited.
-     */
-    vlinkColor: string;
-    readonly webkitCurrentFullScreenElement: Element | null;
-    readonly webkitFullscreenElement: Element | null;
-    readonly webkitFullscreenEnabled: boolean;
-    readonly webkitIsFullScreen: boolean;
-    readonly xmlEncoding: string | null;
-    xmlStandalone: boolean;
-    /**
-     * Gets or sets the version attribute specified in the declaration of an XML document.
-     */
-    xmlVersion: string | null;
-    adoptNode<T extends Node>(source: T): T;
-    captureEvents(): void;
-    caretRangeFromPoint(x: number, y: number): Range;
-    clear(): void;
-    /**
-     * Closes an output stream and forces the sent data to display.
-     */
-    close(): void;
-    /**
-     * Creates an attribute object with a specified name.
-     * @param name String that sets the attribute object's name.
-     */
-    createAttribute(name: string): Attr;
-    createAttributeNS(namespaceURI: string | null, qualifiedName: string): Attr;
-    createCDATASection(data: string): CDATASection;
-    /**
-     * Creates a comment object with the specified data.
-     * @param data Sets the comment object's data.
-     */
-    createComment(data: string): Comment;
-    /**
-     * Creates a new document.
-     */
-    createDocumentFragment(): DocumentFragment;
-    /**
-     * Creates an instance of the element for the specified tag.
-     * @param tagName The name of an element.
-     */
-    createElement<K extends keyof HTMLElementTagNameMap>(tagName: K, options?: ElementCreationOptions): HTMLElementTagNameMap[K];
-    createElement(tagName: string, options?: ElementCreationOptions): HTMLElement;
-    createElementNS(namespaceURI: "http://www.w3.org/1999/xhtml", qualifiedName: string): HTMLElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "a"): SVGAElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "circle"): SVGCircleElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "clipPath"): SVGClipPathElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "componentTransferFunction"): SVGComponentTransferFunctionElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "defs"): SVGDefsElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "desc"): SVGDescElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "ellipse"): SVGEllipseElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feBlend"): SVGFEBlendElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feColorMatrix"): SVGFEColorMatrixElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feComponentTransfer"): SVGFEComponentTransferElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feComposite"): SVGFECompositeElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feConvolveMatrix"): SVGFEConvolveMatrixElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feDiffuseLighting"): SVGFEDiffuseLightingElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feDisplacementMap"): SVGFEDisplacementMapElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feDistantLight"): SVGFEDistantLightElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feFlood"): SVGFEFloodElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feFuncA"): SVGFEFuncAElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feFuncB"): SVGFEFuncBElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feFuncG"): SVGFEFuncGElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feFuncR"): SVGFEFuncRElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feGaussianBlur"): SVGFEGaussianBlurElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feImage"): SVGFEImageElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feMerge"): SVGFEMergeElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feMergeNode"): SVGFEMergeNodeElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feMorphology"): SVGFEMorphologyElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feOffset"): SVGFEOffsetElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "fePointLight"): SVGFEPointLightElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feSpecularLighting"): SVGFESpecularLightingElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feSpotLight"): SVGFESpotLightElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feTile"): SVGFETileElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feTurbulence"): SVGFETurbulenceElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "filter"): SVGFilterElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "foreignObject"): SVGForeignObjectElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "g"): SVGGElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "image"): SVGImageElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "gradient"): SVGGradientElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "line"): SVGLineElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "linearGradient"): SVGLinearGradientElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "marker"): SVGMarkerElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "mask"): SVGMaskElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "path"): SVGPathElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "metadata"): SVGMetadataElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "pattern"): SVGPatternElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "polygon"): SVGPolygonElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "polyline"): SVGPolylineElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "radialGradient"): SVGRadialGradientElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "rect"): SVGRectElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "svg"): SVGSVGElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "script"): SVGScriptElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "stop"): SVGStopElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "style"): SVGStyleElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "switch"): SVGSwitchElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "symbol"): SVGSymbolElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "tspan"): SVGTSpanElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "textContent"): SVGTextContentElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "text"): SVGTextElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "textPath"): SVGTextPathElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "textPositioning"): SVGTextPositioningElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "title"): SVGTitleElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "use"): SVGUseElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "view"): SVGViewElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: string): SVGElement;
-    createElementNS(namespaceURI: string | null, qualifiedName: string): Element;
-    createExpression(expression: string, resolver: XPathNSResolver): XPathExpression;
-    createNSResolver(nodeResolver: Node): XPathNSResolver;
-    /**
-     * Creates a NodeIterator object that you can use to traverse filtered lists of nodes or elements in a document.
-     * @param root The root element or node to start traversing on.
-     * @param whatToShow The type of nodes or elements to appear in the node list
-     * @param filter A custom NodeFilter function to use. For more information, see filter. Use null for no filter.
-     * @param entityReferenceExpansion A flag that specifies whether entity reference nodes are expanded.
-     */
-    createNodeIterator(root: Node, whatToShow?: number, filter?: NodeFilter, entityReferenceExpansion?: boolean): NodeIterator;
-    createProcessingInstruction(target: string, data: string): ProcessingInstruction;
-    /**
-     *  Returns an empty range object that has both of its boundary points positioned at the beginning of the document.
-     */
-    createRange(): Range;
-    /**
-     * Creates a text string from the specified value.
-     * @param data String that specifies the nodeValue property of the text node.
-     */
-    createTextNode(data: string): Text;
-    createTouch(view: Window, target: EventTarget, identifier: number, pageX: number, pageY: number, screenX: number, screenY: number): Touch;
-    createTouchList(...touches: Touch[]): TouchList;
-    /**
-     * Creates a TreeWalker object that you can use to traverse filtered lists of nodes or elements in a document.
-     * @param root The root element or node to start traversing on.
-     * @param whatToShow The type of nodes or elements to appear in the node list. For more information, see whatToShow.
-     * @param filter A custom NodeFilter function to use.
-     * @param entityReferenceExpansion A flag that specifies whether entity reference nodes are expanded.
-     */
-    createTreeWalker(root: Node, whatToShow?: number, filter?: NodeFilter, entityReferenceExpansion?: boolean): TreeWalker;
-    /**
-     * Returns the element for the specified x coordinate and the specified y coordinate.
-     * @param x The x-offset
-     * @param y The y-offset
-     */
-    elementFromPoint(x: number, y: number): Element;
-    elementsFromPoint(x: number, y: number): Element[];
-    evaluate(expression: string, contextNode: Node, resolver: XPathNSResolver | null, type: number, result: XPathResult | null): XPathResult;
-    /**
-     * Executes a command on the current document, current selection, or the given range.
-     * @param commandId String that specifies the command to execute. This command can be any of the command identifiers that can be executed in script.
-     * @param showUI Display the user interface, defaults to false.
-     * @param value Value to assign.
-     */
-    execCommand(commandId: string, showUI?: boolean, value?: any): boolean;
-    /**
-     * Displays help information for the given command identifier.
-     * @param commandId Displays help information for the given command identifier.
-     */
-    execCommandShowHelp(commandId: string): boolean;
-    exitFullscreen(): void;
-    exitPointerLock(): void;
-    /**
-     * Causes the element to receive the focus and executes the code specified by the onfocus event.
-     */
-    /** @deprecated */
-    focus(): void;
-    /**
-     * Returns a reference to the first object with the specified value of the ID or NAME attribute.
-     * @param elementId String that specifies the ID value. Case-insensitive.
-     */
-    getElementById(elementId: string): HTMLElement | null;
-    getElementsByClassName(classNames: string): HTMLCollectionOf<Element>;
-    /**
-     * Gets a collection of objects based on the value of the NAME or ID attribute.
-     * @param elementName Gets a collection of objects based on the value of the NAME or ID attribute.
-     */
-    getElementsByName(elementName: string): NodeListOf<HTMLElement>;
-    /**
-     * Retrieves a collection of objects based on the specified element name.
-     * @param name Specifies the name of an element.
-     */
-    getElementsByTagName<K extends keyof HTMLElementTagNameMap>(tagname: K): NodeListOf<HTMLElementTagNameMap[K]>;
-    getElementsByTagName<K extends keyof SVGElementTagNameMap>(tagname: K): NodeListOf<SVGElementTagNameMap[K]>;
-    getElementsByTagName(tagname: string): NodeListOf<Element>;
-    getElementsByTagNameNS(namespaceURI: "http://www.w3.org/1999/xhtml", localName: string): HTMLCollectionOf<HTMLElement>;
-    getElementsByTagNameNS(namespaceURI: "http://www.w3.org/2000/svg", localName: string): HTMLCollectionOf<SVGElement>;
-    getElementsByTagNameNS(namespaceURI: string, localName: string): HTMLCollectionOf<Element>;
-    /**
-     * Returns an object representing the current selection of the document that is loaded into the object displaying a webpage.
-     */
-    getSelection(): Selection;
-    /**
-     * Gets a value indicating whether the object currently has focus.
-     */
-    hasFocus(): boolean;
-    importNode<T extends Node>(importedNode: T, deep: boolean): T;
-    msElementsFromPoint(x: number, y: number): NodeListOf<Element>;
-    msElementsFromRect(left: number, top: number, width: number, height: number): NodeListOf<Element>;
-    /**
-     * Opens a new window and loads a document specified by a given URL. Also, opens a new window that uses the url parameter and the name parameter to collect the output of the write method and the writeln method.
-     * @param url Specifies a MIME type for the document.
-     * @param name Specifies the name of the window. This name is used as the value for the TARGET attribute on a form or an anchor element.
-     * @param features Contains a list of items separated by commas. Each item consists of an option and a value, separated by an equals sign (for example, "fullscreen=yes, toolbar=yes"). The following values are supported.
-     * @param replace Specifies whether the existing entry for the document is replaced in the history list.
-     */
-    open(url?: string, name?: string, features?: string, replace?: boolean): Document;
-    /**
-     * Returns a Boolean value that indicates whether a specified command can be successfully executed using execCommand, given the current state of the document.
-     * @param commandId Specifies a command identifier.
-     */
-    queryCommandEnabled(commandId: string): boolean;
-    /**
-     * Returns a Boolean value that indicates whether the specified command is in the indeterminate state.
-     * @param commandId String that specifies a command identifier.
-     */
-    queryCommandIndeterm(commandId: string): boolean;
-    /**
-     * Returns a Boolean value that indicates the current state of the command.
-     * @param commandId String that specifies a command identifier.
-     */
-    queryCommandState(commandId: string): boolean;
-    /**
-     * Returns a Boolean value that indicates whether the current command is supported on the current range.
-     * @param commandId Specifies a command identifier.
-     */
-    queryCommandSupported(commandId: string): boolean;
-    /**
-     * Retrieves the string associated with a command.
-     * @param commandId String that contains the identifier of a command. This can be any command identifier given in the list of Command Identifiers.
-     */
-    queryCommandText(commandId: string): string;
-    /**
-     * Returns the current value of the document, range, or current selection for the given command.
-     * @param commandId String that specifies a command identifier.
-     */
-    queryCommandValue(commandId: string): string;
-    releaseEvents(): void;
-    updateSettings(): void;
-    webkitCancelFullScreen(): void;
-    webkitExitFullscreen(): void;
-    /**
-     * Writes one or more HTML expressions to a document in the specified window.
-     * @param content Specifies the text and HTML tags to write.
-     */
-    write(...content: string[]): void;
-    /**
-     * Writes one or more HTML expressions, followed by a carriage return, to a document in the specified window.
-     * @param content The text and HTML tags to write.
-     */
-    writeln(...content: string[]): void;
-    addEventListener<K extends keyof DocumentEventMap>(type: K, listener: (this: Document, ev: DocumentEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof DocumentEventMap>(type: K, listener: (this: Document, ev: DocumentEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var Document: {
-    prototype: Document;
-    new(): Document;
-};
-
-interface DocumentEvent {
-    createEvent(eventInterface: "AnimationEvent"): AnimationEvent;
-    createEvent(eventInterface: "AnimationPlaybackEvent"): AnimationPlaybackEvent;
-    createEvent(eventInterface: "AudioProcessingEvent"): AudioProcessingEvent;
-    createEvent(eventInterface: "BeforeUnloadEvent"): BeforeUnloadEvent;
-    createEvent(eventInterface: "ClipboardEvent"): ClipboardEvent;
-    createEvent(eventInterface: "CloseEvent"): CloseEvent;
-    createEvent(eventInterface: "CompositionEvent"): CompositionEvent;
-    createEvent(eventInterface: "CustomEvent"): CustomEvent;
-    createEvent(eventInterface: "DeviceLightEvent"): DeviceLightEvent;
-    createEvent(eventInterface: "DeviceMotionEvent"): DeviceMotionEvent;
-    createEvent(eventInterface: "DeviceOrientationEvent"): DeviceOrientationEvent;
-    createEvent(eventInterface: "DragEvent"): DragEvent;
-    createEvent(eventInterface: "ErrorEvent"): ErrorEvent;
-    createEvent(eventInterface: "Event"): Event;
-    createEvent(eventInterface: "Events"): Event;
-    createEvent(eventInterface: "FocusEvent"): FocusEvent;
-    createEvent(eventInterface: "FocusNavigationEvent"): FocusNavigationEvent;
-    createEvent(eventInterface: "GamepadEvent"): GamepadEvent;
-    createEvent(eventInterface: "HashChangeEvent"): HashChangeEvent;
-    createEvent(eventInterface: "IDBVersionChangeEvent"): IDBVersionChangeEvent;
-    createEvent(eventInterface: "KeyboardEvent"): KeyboardEvent;
-    createEvent(eventInterface: "ListeningStateChangedEvent"): ListeningStateChangedEvent;
-    createEvent(eventInterface: "MSDCCEvent"): MSDCCEvent;
-    createEvent(eventInterface: "MSDSHEvent"): MSDSHEvent;
-    createEvent(eventInterface: "MSMediaKeyMessageEvent"): MSMediaKeyMessageEvent;
-    createEvent(eventInterface: "MSMediaKeyNeededEvent"): MSMediaKeyNeededEvent;
-    createEvent(eventInterface: "MediaEncryptedEvent"): MediaEncryptedEvent;
-    createEvent(eventInterface: "MediaKeyMessageEvent"): MediaKeyMessageEvent;
-    createEvent(eventInterface: "MediaStreamErrorEvent"): MediaStreamErrorEvent;
-    createEvent(eventInterface: "MediaStreamEvent"): MediaStreamEvent;
-    createEvent(eventInterface: "MediaStreamTrackEvent"): MediaStreamTrackEvent;
-    createEvent(eventInterface: "MessageEvent"): MessageEvent;
-    createEvent(eventInterface: "MouseEvent"): MouseEvent;
-    createEvent(eventInterface: "MouseEvents"): MouseEvent;
-    createEvent(eventInterface: "MutationEvent"): MutationEvent;
-    createEvent(eventInterface: "MutationEvents"): MutationEvent;
-    createEvent(eventInterface: "OfflineAudioCompletionEvent"): OfflineAudioCompletionEvent;
-    createEvent(eventInterface: "OverflowEvent"): OverflowEvent;
-    createEvent(eventInterface: "PageTransitionEvent"): PageTransitionEvent;
-    createEvent(eventInterface: "PaymentRequestUpdateEvent"): PaymentRequestUpdateEvent;
-    createEvent(eventInterface: "PermissionRequestedEvent"): PermissionRequestedEvent;
-    createEvent(eventInterface: "PointerEvent"): PointerEvent;
-    createEvent(eventInterface: "PopStateEvent"): PopStateEvent;
-    createEvent(eventInterface: "ProgressEvent"): ProgressEvent;
-    createEvent(eventInterface: "PromiseRejectionEvent"): PromiseRejectionEvent;
-    createEvent(eventInterface: "RTCDTMFToneChangeEvent"): RTCDTMFToneChangeEvent;
-    createEvent(eventInterface: "RTCDtlsTransportStateChangedEvent"): RTCDtlsTransportStateChangedEvent;
-    createEvent(eventInterface: "RTCIceCandidatePairChangedEvent"): RTCIceCandidatePairChangedEvent;
-    createEvent(eventInterface: "RTCIceGathererEvent"): RTCIceGathererEvent;
-    createEvent(eventInterface: "RTCIceTransportStateChangedEvent"): RTCIceTransportStateChangedEvent;
-    createEvent(eventInterface: "RTCPeerConnectionIceEvent"): RTCPeerConnectionIceEvent;
-    createEvent(eventInterface: "RTCSsrcConflictEvent"): RTCSsrcConflictEvent;
-    createEvent(eventInterface: "SVGZoomEvent"): SVGZoomEvent;
-    createEvent(eventInterface: "SVGZoomEvents"): SVGZoomEvent;
-    createEvent(eventInterface: "SecurityPolicyViolationEvent"): SecurityPolicyViolationEvent;
-    createEvent(eventInterface: "ServiceWorkerMessageEvent"): ServiceWorkerMessageEvent;
-    createEvent(eventInterface: "SpeechSynthesisEvent"): SpeechSynthesisEvent;
-    createEvent(eventInterface: "StorageEvent"): StorageEvent;
-    createEvent(eventInterface: "TextEvent"): TextEvent;
-    createEvent(eventInterface: "TouchEvent"): TouchEvent;
-    createEvent(eventInterface: "TrackEvent"): TrackEvent;
-    createEvent(eventInterface: "TransitionEvent"): TransitionEvent;
-    createEvent(eventInterface: "UIEvent"): UIEvent;
-    createEvent(eventInterface: "UIEvents"): UIEvent;
-    createEvent(eventInterface: "VRDisplayEvent"): VRDisplayEvent;
-    createEvent(eventInterface: "VRDisplayEvent "): VRDisplayEvent ;
-    createEvent(eventInterface: "WebGLContextEvent"): WebGLContextEvent;
-    createEvent(eventInterface: "WheelEvent"): WheelEvent;
-    createEvent(eventInterface: string): Event;
-}
-
-interface DocumentFragment extends Node, ParentNode {
-    getElementById(elementId: string): HTMLElement | null;
-}
-
-declare var DocumentFragment: {
-    prototype: DocumentFragment;
-    new(): DocumentFragment;
-};
-
-interface DocumentOrShadowRoot {
-    readonly activeElement: Element | null;
-    readonly styleSheets: StyleSheetList;
-    elementFromPoint(x: number, y: number): Element | null;
-    elementsFromPoint(x: number, y: number): Element[];
-    getSelection(): Selection | null;
-}
-
-interface DocumentType extends Node, ChildNode {
-    readonly entities: NamedNodeMap;
-    readonly internalSubset: string | null;
-    readonly name: string;
-    readonly notations: NamedNodeMap;
-    readonly publicId: string;
-    readonly systemId: string;
-}
-
-declare var DocumentType: {
-    prototype: DocumentType;
-    new(): DocumentType;
-};
-
-interface DragEvent extends MouseEvent {
-    readonly dataTransfer: DataTransfer;
-    initDragEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number, screenXArg: number, screenYArg: number, clientXArg: number, clientYArg: number, ctrlKeyArg: boolean, altKeyArg: boolean, shiftKeyArg: boolean, metaKeyArg: boolean, buttonArg: number, relatedTargetArg: EventTarget, dataTransferArg: DataTransfer): void;
-    msConvertURL(file: File, targetType: string, targetURL?: string): void;
-}
-
-declare var DragEvent: {
-    prototype: DragEvent;
-    new(type: "drag" | "dragend" | "dragenter" | "dragexit" | "dragleave" | "dragover" | "dragstart" | "drop", dragEventInit?: { dataTransfer?: DataTransfer }): DragEvent;
-};
-
-interface DynamicsCompressorNode extends AudioNode {
-    readonly attack: AudioParam;
-    readonly knee: AudioParam;
-    readonly ratio: AudioParam;
-    readonly reduction: number;
-    readonly release: AudioParam;
-    readonly threshold: AudioParam;
-}
-
-declare var DynamicsCompressorNode: {
-    prototype: DynamicsCompressorNode;
-    new(): DynamicsCompressorNode;
-};
-
-interface EXT_blend_minmax {
-    readonly MAX_EXT: number;
-    readonly MIN_EXT: number;
-}
-
-interface EXT_frag_depth {
-}
-
-interface EXT_sRGB {
-    readonly FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING_EXT: number;
-    readonly SRGB8_ALPHA8_EXT: number;
-    readonly SRGB_ALPHA_EXT: number;
-    readonly SRGB_EXT: number;
-}
-
-interface EXT_shader_texture_lod {
-}
-
-interface EXT_texture_filter_anisotropic {
-    readonly MAX_TEXTURE_MAX_ANISOTROPY_EXT: number;
-    readonly TEXTURE_MAX_ANISOTROPY_EXT: number;
-}
-
-declare var EXT_texture_filter_anisotropic: {
-    prototype: EXT_texture_filter_anisotropic;
-    new(): EXT_texture_filter_anisotropic;
-    readonly MAX_TEXTURE_MAX_ANISOTROPY_EXT: number;
-    readonly TEXTURE_MAX_ANISOTROPY_EXT: number;
-};
-
-interface ElementEventMap extends GlobalEventHandlersEventMap {
-    "ariarequest": Event;
-    "command": Event;
-    "gotpointercapture": PointerEvent;
-    "lostpointercapture": PointerEvent;
-    "MSGestureChange": Event;
-    "MSGestureDoubleTap": Event;
-    "MSGestureEnd": Event;
-    "MSGestureHold": Event;
-    "MSGestureStart": Event;
-    "MSGestureTap": Event;
-    "MSGotPointerCapture": Event;
-    "MSInertiaStart": Event;
-    "MSLostPointerCapture": Event;
-    "MSPointerCancel": Event;
-    "MSPointerDown": Event;
-    "MSPointerEnter": Event;
-    "MSPointerLeave": Event;
-    "MSPointerMove": Event;
-    "MSPointerOut": Event;
-    "MSPointerOver": Event;
-    "MSPointerUp": Event;
-    "touchcancel": TouchEvent;
-    "touchend": TouchEvent;
-    "touchmove": TouchEvent;
-    "touchstart": TouchEvent;
-    "webkitfullscreenchange": Event;
-    "webkitfullscreenerror": Event;
-}
-
-interface Element extends Node, GlobalEventHandlers, ElementTraversal, ParentNode, ChildNode {
-    readonly assignedSlot: HTMLSlotElement | null;
-    readonly attributes: NamedNodeMap;
-    readonly classList: DOMTokenList;
-    className: string;
-    readonly clientHeight: number;
-    readonly clientLeft: number;
-    readonly clientTop: number;
-    readonly clientWidth: number;
-    id: string;
-    innerHTML: string;
-    msContentZoomFactor: number;
-    readonly msRegionOverflow: string;
-    onariarequest: ((this: Element, ev: Event) => any) | null;
-    oncommand: ((this: Element, ev: Event) => any) | null;
-    ongotpointercapture: ((this: Element, ev: PointerEvent) => any) | null;
-    onlostpointercapture: ((this: Element, ev: PointerEvent) => any) | null;
-    onmsgesturechange: ((this: Element, ev: Event) => any) | null;
-    onmsgesturedoubletap: ((this: Element, ev: Event) => any) | null;
-    onmsgestureend: ((this: Element, ev: Event) => any) | null;
-    onmsgesturehold: ((this: Element, ev: Event) => any) | null;
-    onmsgesturestart: ((this: Element, ev: Event) => any) | null;
-    onmsgesturetap: ((this: Element, ev: Event) => any) | null;
-    onmsgotpointercapture: ((this: Element, ev: Event) => any) | null;
-    onmsinertiastart: ((this: Element, ev: Event) => any) | null;
-    onmslostpointercapture: ((this: Element, ev: Event) => any) | null;
-    onmspointercancel: ((this: Element, ev: Event) => any) | null;
-    onmspointerdown: ((this: Element, ev: Event) => any) | null;
-    onmspointerenter: ((this: Element, ev: Event) => any) | null;
-    onmspointerleave: ((this: Element, ev: Event) => any) | null;
-    onmspointermove: ((this: Element, ev: Event) => any) | null;
-    onmspointerout: ((this: Element, ev: Event) => any) | null;
-    onmspointerover: ((this: Element, ev: Event) => any) | null;
-    onmspointerup: ((this: Element, ev: Event) => any) | null;
-    ontouchcancel: ((this: Element, ev: TouchEvent) => any) | null;
-    ontouchend: ((this: Element, ev: TouchEvent) => any) | null;
-    ontouchmove: ((this: Element, ev: TouchEvent) => any) | null;
-    ontouchstart: ((this: Element, ev: TouchEvent) => any) | null;
-    onwebkitfullscreenchange: ((this: Element, ev: Event) => any) | null;
-    onwebkitfullscreenerror: ((this: Element, ev: Event) => any) | null;
-    outerHTML: string;
-    readonly prefix: string | null;
-    readonly scrollHeight: number;
-    scrollLeft: number;
-    scrollTop: number;
-    readonly scrollWidth: number;
-    readonly shadowRoot: ShadowRoot | null;
-    slot: string;
-    readonly tagName: string;
-    attachShadow(shadowRootInitDict: ShadowRootInit): ShadowRoot;
-    closest<K extends keyof HTMLElementTagNameMap>(selector: K): HTMLElementTagNameMap[K] | null;
-    closest<K extends keyof SVGElementTagNameMap>(selector: K): SVGElementTagNameMap[K] | null;
-    closest(selector: string): Element | null;
-    getAttribute(qualifiedName: string): string | null;
-    getAttributeNS(namespaceURI: string, localName: string): string;
-    getAttributeNode(name: string): Attr | null;
-    getAttributeNodeNS(namespaceURI: string, localName: string): Attr | null;
-    getBoundingClientRect(): ClientRect | DOMRect;
-    getClientRects(): ClientRectList | DOMRectList;
-    getElementsByClassName(classNames: string): NodeListOf<Element>;
-    getElementsByTagName<K extends keyof HTMLElementTagNameMap>(name: K): NodeListOf<HTMLElementTagNameMap[K]>;
-    getElementsByTagName<K extends keyof SVGElementTagNameMap>(name: K): NodeListOf<SVGElementTagNameMap[K]>;
-    getElementsByTagName(name: string): NodeListOf<Element>;
-    getElementsByTagNameNS(namespaceURI: "http://www.w3.org/1999/xhtml", localName: string): HTMLCollectionOf<HTMLElement>;
-    getElementsByTagNameNS(namespaceURI: "http://www.w3.org/2000/svg", localName: string): HTMLCollectionOf<SVGElement>;
-    getElementsByTagNameNS(namespaceURI: string, localName: string): HTMLCollectionOf<Element>;
-    hasAttribute(name: string): boolean;
-    hasAttributeNS(namespaceURI: string, localName: string): boolean;
-    hasAttributes(): boolean;
-    insertAdjacentElement(position: InsertPosition, insertedElement: Element): Element | null;
-    insertAdjacentHTML(where: InsertPosition, html: string): void;
-    insertAdjacentText(where: InsertPosition, text: string): void;
-    matches(selectors: string): boolean;
-    msGetRegionContent(): any;
-    msGetUntransformedBounds(): ClientRect;
-    msMatchesSelector(selectors: string): boolean;
-    msReleasePointerCapture(pointerId: number): void;
-    msSetPointerCapture(pointerId: number): void;
-    msZoomTo(args: MsZoomToOptions): void;
-    releasePointerCapture(pointerId: number): void;
-    removeAttribute(qualifiedName: string): void;
-    removeAttributeNS(namespaceURI: string, localName: string): void;
-    removeAttributeNode(oldAttr: Attr): Attr;
-    requestFullscreen(): void;
-    requestPointerLock(): void;
-    scroll(options?: ScrollToOptions): void;
-    scroll(x: number, y: number): void;
-    scrollBy(options?: ScrollToOptions): void;
-    scrollBy(x: number, y: number): void;
-    scrollIntoView(arg?: boolean | ScrollIntoViewOptions): void;
-    scrollTo(options?: ScrollToOptions): void;
-    scrollTo(x: number, y: number): void;
-    setAttribute(qualifiedName: string, value: string): void;
-    setAttributeNS(namespaceURI: string, qualifiedName: string, value: string): void;
-    setAttributeNode(newAttr: Attr): Attr;
-    setAttributeNodeNS(newAttr: Attr): Attr;
-    setPointerCapture(pointerId: number): void;
-    webkitMatchesSelector(selectors: string): boolean;
-    webkitRequestFullScreen(): void;
-    webkitRequestFullscreen(): void;
-    addEventListener<K extends keyof ElementEventMap>(type: K, listener: (this: Element, ev: ElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof ElementEventMap>(type: K, listener: (this: Element, ev: ElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var Element: {
-    prototype: Element;
-    new(): Element;
-};
-
-interface ElementCSSInlineStyle {
-    readonly style: CSSStyleDeclaration;
-}
-
-interface ElementCreationOptions {
-    is?: string;
-}
-
-interface ElementDefinitionOptions {
-    extends: string;
-}
-
-interface ElementTraversal {
-    readonly childElementCount: number;
-    readonly firstElementChild: Element | null;
-    readonly lastElementChild: Element | null;
-    readonly nextElementSibling: Element | null;
-    readonly previousElementSibling: Element | null;
-}
-
-interface ErrorEvent extends Event {
-    readonly colno: number;
-    readonly error: any;
-    readonly filename: string;
-    readonly lineno: number;
-    readonly message: string;
-    initErrorEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, messageArg: string, filenameArg: string, linenoArg: number): void;
-}
-
-declare var ErrorEvent: {
-    prototype: ErrorEvent;
-    new(typeArg: string, eventInitDict?: ErrorEventInit): ErrorEvent;
-};
-
-interface Event {
-    readonly bubbles: boolean;
-    cancelBubble: boolean;
-    readonly cancelable: boolean;
-    readonly currentTarget: EventTarget | null;
-    readonly defaultPrevented: boolean;
-    readonly eventPhase: number;
-    readonly isTrusted: boolean;
-    returnValue: boolean;
-    readonly scoped: boolean;
-    readonly srcElement: Element | null;
-    readonly target: EventTarget | null;
-    readonly timeStamp: number;
-    readonly type: string;
-    deepPath(): EventTarget[];
-    initEvent(type: string, bubbles?: boolean, cancelable?: boolean): void;
-    preventDefault(): void;
-    stopImmediatePropagation(): void;
-    stopPropagation(): void;
-    readonly AT_TARGET: number;
-    readonly BUBBLING_PHASE: number;
-    readonly CAPTURING_PHASE: number;
-    readonly NONE: number;
-}
-
-declare var Event: {
-    prototype: Event;
-    new(typeArg: string, eventInitDict?: EventInit): Event;
-    readonly AT_TARGET: number;
-    readonly BUBBLING_PHASE: number;
-    readonly CAPTURING_PHASE: number;
-    readonly NONE: number;
-};
-
-interface EventListenerObject {
-    handleEvent(evt: Event): void;
-}
-
-interface EventSource extends EventTarget {
-    readonly CLOSED: number;
-    readonly CONNECTING: number;
-    readonly OPEN: number;
-    onerror: (evt: MessageEvent) => any;
-    onmessage: (evt: MessageEvent) => any;
-    onopen: (evt: MessageEvent) => any;
-    readonly readyState: number;
-    readonly url: string;
-    readonly withCredentials: boolean;
-    close(): void;
-}
-
-declare var EventSource: {
-    prototype: EventSource;
-    new(url: string, eventSourceInitDict?: EventSourceInit): EventSource;
-};
-
-interface EventSourceInit {
-    readonly withCredentials: boolean;
-}
-
-interface EventTarget {
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject | null, options?: boolean | AddEventListenerOptions): void;
-    dispatchEvent(evt: Event): boolean;
-    removeEventListener(type: string, listener?: EventListenerOrEventListenerObject | null, options?: EventListenerOptions | boolean): void;
-}
-
-declare var EventTarget: {
-    prototype: EventTarget;
-    new(): EventTarget;
-};
-
-interface ExtensionScriptApis {
-    extensionIdToShortId(extensionId: string): number;
-    fireExtensionApiTelemetry(functionName: string, isSucceeded: boolean, isSupported: boolean, errorString: string): void;
-    genericFunction(routerAddress: any, parameters?: string, callbackId?: number): void;
-    genericSynchronousFunction(functionId: number, parameters?: string): string;
-    genericWebRuntimeCallout(to: any, from: any, payload: string): void;
-    getExtensionId(): string;
-    registerGenericFunctionCallbackHandler(callbackHandler: Function): void;
-    registerGenericPersistentCallbackHandler(callbackHandler: Function): void;
-    registerWebRuntimeCallbackHandler(handler: Function): any;
-}
-
-declare var ExtensionScriptApis: {
-    prototype: ExtensionScriptApis;
-    new(): ExtensionScriptApis;
-};
-
-interface External {
-}
-
-declare var External: {
-    prototype: External;
-    new(): External;
-};
-
-interface File extends Blob {
-    readonly lastModified: number;
-    /** @deprecated */
-    readonly lastModifiedDate: Date;
-    readonly name: string;
-    readonly webkitRelativePath: string;
-}
-
-declare var File: {
-    prototype: File;
-    new (parts: (ArrayBuffer | ArrayBufferView | Blob | string)[], filename: string, properties?: FilePropertyBag): File;
-};
-
-interface FileList {
-    readonly length: number;
-    item(index: number): File | null;
-    [index: number]: File;
-}
-
-declare var FileList: {
-    prototype: FileList;
-    new(): FileList;
-};
-
-interface FilePropertyBag extends BlobPropertyBag {
-    lastModified?: number;
-}
-
-interface FileReaderEventMap {
-    "abort": ProgressEvent;
-    "error": ProgressEvent;
-    "load": ProgressEvent;
-    "loadend": ProgressEvent;
-    "loadstart": ProgressEvent;
-    "progress": ProgressEvent;
-}
-
-interface FileReader extends EventTarget {
-    readonly error: DOMException | null;
-    onabort: ((this: FileReader, ev: FileReaderProgressEvent) => any) | null;
-    onerror: ((this: FileReader, ev: FileReaderProgressEvent) => any) | null;
-    onload: ((this: FileReader, ev: FileReaderProgressEvent) => any) | null;
-    onloadend: ((this: FileReader, ev: FileReaderProgressEvent) => any) | null;
-    onloadstart: ((this: FileReader, ev: FileReaderProgressEvent) => any) | null;
-    onprogress: ((this: FileReader, ev: FileReaderProgressEvent) => any) | null;
-    readonly readyState: number;
-    readonly result: any;
-    abort(): void;
-    readAsArrayBuffer(blob: Blob): void;
-    readAsBinaryString(blob: Blob): void;
-    readAsDataURL(blob: Blob): void;
-    readAsText(blob: Blob, label?: string): void;
-    readonly DONE: number;
-    readonly EMPTY: number;
-    readonly LOADING: number;
-    addEventListener<K extends keyof FileReaderEventMap>(type: K, listener: (this: FileReader, ev: FileReaderEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof FileReaderEventMap>(type: K, listener: (this: FileReader, ev: FileReaderEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var FileReader: {
-    prototype: FileReader;
-    new(): FileReader;
-    readonly DONE: number;
-    readonly EMPTY: number;
-    readonly LOADING: number;
-};
-
-interface FileReaderProgressEvent extends ProgressEvent {
-    readonly target: FileReader | null;
-}
-
-interface FocusEvent extends UIEvent {
-    readonly relatedTarget: EventTarget;
-    initFocusEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number, relatedTargetArg: EventTarget): void;
-}
-
-declare var FocusEvent: {
-    prototype: FocusEvent;
-    new(typeArg: string, eventInitDict?: FocusEventInit): FocusEvent;
-};
-
-interface FocusNavigationEvent extends Event {
-    readonly navigationReason: NavigationReason;
-    readonly originHeight: number;
-    readonly originLeft: number;
-    readonly originTop: number;
-    readonly originWidth: number;
-    requestFocus(): void;
-}
-
-declare var FocusNavigationEvent: {
-    prototype: FocusNavigationEvent;
-    new(type: string, eventInitDict?: FocusNavigationEventInit): FocusNavigationEvent;
-};
-
-interface FormData {
-    append(name: string, value: string | Blob, fileName?: string): void;
-    delete(name: string): void;
-    get(name: string): FormDataEntryValue | null;
-    getAll(name: string): FormDataEntryValue[];
-    has(name: string): boolean;
-    set(name: string, value: string | Blob, fileName?: string): void;
-}
-
-declare var FormData: {
-    prototype: FormData;
-    new(): FormData;
-    new(form: HTMLFormElement): FormData;
-};
-
-interface GainNode extends AudioNode {
-    readonly gain: AudioParam;
-}
-
-declare var GainNode: {
-    prototype: GainNode;
-    new(): GainNode;
-};
-
-interface Gamepad {
-    readonly axes: number[];
-    readonly buttons: GamepadButton[];
-    readonly connected: boolean;
-    readonly displayId: number;
-    readonly hand: GamepadHand;
-    readonly hapticActuators: GamepadHapticActuator[];
-    readonly id: string;
-    readonly index: number;
-    readonly mapping: GamepadMappingType;
-    readonly pose: GamepadPose | null;
-    readonly timestamp: number;
-}
-
-declare var Gamepad: {
-    prototype: Gamepad;
-    new(): Gamepad;
-};
-
-interface GamepadButton {
-    readonly pressed: boolean;
-    readonly touched: boolean;
-    readonly value: number;
-}
-
-declare var GamepadButton: {
-    prototype: GamepadButton;
-    new(): GamepadButton;
-};
-
-interface GamepadEvent extends Event {
-    readonly gamepad: Gamepad;
-}
-
-declare var GamepadEvent: {
-    prototype: GamepadEvent;
-    new(typeArg: string, eventInitDict?: GamepadEventInit): GamepadEvent;
-};
-
-interface GamepadHapticActuator {
-    readonly type: GamepadHapticActuatorType;
-    pulse(value: number, duration: number): Promise<boolean>;
-}
-
-declare var GamepadHapticActuator: {
-    prototype: GamepadHapticActuator;
-    new(): GamepadHapticActuator;
-};
-
-interface GamepadPose {
-    readonly angularAcceleration: Float32Array | null;
-    readonly angularVelocity: Float32Array | null;
-    readonly hasOrientation: boolean;
-    readonly hasPosition: boolean;
-    readonly linearAcceleration: Float32Array | null;
-    readonly linearVelocity: Float32Array | null;
-    readonly orientation: Float32Array | null;
-    readonly position: Float32Array | null;
-}
-
-declare var GamepadPose: {
-    prototype: GamepadPose;
-    new(): GamepadPose;
-};
-
-interface Geolocation {
-    clearWatch(watchId: number): void;
-    getCurrentPosition(successCallback: PositionCallback, errorCallback?: PositionErrorCallback, options?: PositionOptions): void;
-    watchPosition(successCallback: PositionCallback, errorCallback?: PositionErrorCallback, options?: PositionOptions): number;
-}
-
-declare var Geolocation: {
-    prototype: Geolocation;
-    new(): Geolocation;
-};
-
-interface GetSVGDocument {
-    getSVGDocument(): Document;
-}
-
-interface GlobalEventHandlersEventMap {
-    "pointercancel": PointerEvent;
-    "pointerdown": PointerEvent;
-    "pointerenter": PointerEvent;
-    "pointerleave": PointerEvent;
-    "pointermove": PointerEvent;
-    "pointerout": PointerEvent;
-    "pointerover": PointerEvent;
-    "pointerup": PointerEvent;
-    "wheel": WheelEvent;
-}
-
-interface GlobalEventHandlers {
-    onpointercancel: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
-    onpointerdown: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
-    onpointerenter: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
-    onpointerleave: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
-    onpointermove: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
-    onpointerout: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
-    onpointerover: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
-    onpointerup: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
-    onwheel: ((this: GlobalEventHandlers, ev: WheelEvent) => any) | null;
-    addEventListener<K extends keyof GlobalEventHandlersEventMap>(type: K, listener: (this: GlobalEventHandlers, ev: GlobalEventHandlersEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof GlobalEventHandlersEventMap>(type: K, listener: (this: GlobalEventHandlers, ev: GlobalEventHandlersEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-interface GlobalFetch {
-    fetch(input?: Request | string, init?: RequestInit): Promise<Response>;
-}
-
-interface HTMLAllCollection {
-    readonly length: number;
-    item(nameOrIndex?: string): HTMLCollection | Element | null;
-    namedItem(name: string): HTMLCollection | Element | null;
-    [index: number]: Element;
-}
-
-declare var HTMLAllCollection: {
-    prototype: HTMLAllCollection;
-    new(): HTMLAllCollection;
-};
-
-interface HTMLAnchorElement extends HTMLElement, HTMLHyperlinkElementUtils {
-    Methods: string;
-    /**
-     * Sets or retrieves the character set used to encode the object.
-     */
-    /** @deprecated */
-    charset: string;
-    /**
-     * Sets or retrieves the coordinates of the object.
-     */
-    /** @deprecated */
-    coords: string;
-    download: string;
-    /**
-     * Sets or retrieves the language code of the object.
-     */
-    hreflang: string;
-    readonly mimeType: string;
-    /**
-     * Sets or retrieves the shape of the object.
-     */
-    /** @deprecated */
-    name: string;
-    readonly nameProp: string;
-    readonly protocolLong: string;
-    /**
-     * Sets or retrieves the relationship between the object and the destination of the link.
-     */
-    rel: string;
-    /**
-     * Sets or retrieves the relationship between the object and the destination of the link.
-     */
-    /** @deprecated */
-    rev: string;
-    /**
-     * Sets or retrieves the shape of the object.
-     */
-    /** @deprecated */
-    shape: string;
-    /**
-     * Sets or retrieves the window or frame at which to target content.
-     */
-    target: string;
-    /**
-     * Retrieves or sets the text of the object as a string.
-     */
-    text: string;
-    type: string;
-    urn: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLAnchorElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLAnchorElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLAnchorElement: {
-    prototype: HTMLAnchorElement;
-    new(): HTMLAnchorElement;
-};
-
-interface HTMLAppletElement extends HTMLElement {
-    /** @deprecated */
-    align: string;
-    /**
-     * Sets or retrieves a text alternative to the graphic.
-     */
-    /** @deprecated */
-    alt: string;
-    /**
-     * Sets or retrieves a character string that can be used to implement your own archive functionality for the object.
-     */
-    /** @deprecated */
-    archive: string;
-    /** @deprecated */
-    code: string;
-    /**
-     * Sets or retrieves the URL of the component.
-     */
-    /** @deprecated */
-    codeBase: string;
-    readonly form: HTMLFormElement | null;
-    /**
-     * Sets or retrieves the height of the object.
-     */
-    /** @deprecated */
-    height: string;
-    /** @deprecated */
-    hspace: number;
-    /**
-     * Sets or retrieves the shape of the object.
-     */
-    /** @deprecated */
-    name: string;
-    /** @deprecated */
-    object: string;
-    /** @deprecated */
-    vspace: number;
-    /** @deprecated */
-    width: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLAppletElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLAppletElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLAppletElement: {
-    prototype: HTMLAppletElement;
-    new(): HTMLAppletElement;
-};
-
-interface HTMLAreaElement extends HTMLElement, HTMLHyperlinkElementUtils {
-    /**
-     * Sets or retrieves a text alternative to the graphic.
-     */
-    alt: string;
-    /**
-     * Sets or retrieves the coordinates of the object.
-     */
-    coords: string;
-    download: string;
-    /**
-     * Sets or gets whether clicks in this region cause action.
-     */
-    /** @deprecated */
-    noHref: boolean;
-    rel: string;
-    /**
-     * Sets or retrieves the shape of the object.
-     */
-    shape: string;
-    /**
-     * Sets or retrieves the window or frame at which to target content.
-     */
-    target: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLAreaElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLAreaElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLAreaElement: {
-    prototype: HTMLAreaElement;
-    new(): HTMLAreaElement;
-};
-
-interface HTMLAreasCollection extends HTMLCollectionBase {
-}
-
-declare var HTMLAreasCollection: {
-    prototype: HTMLAreasCollection;
-    new(): HTMLAreasCollection;
-};
-
-interface HTMLAudioElement extends HTMLMediaElement {
-    addEventListener<K extends keyof HTMLMediaElementEventMap>(type: K, listener: (this: HTMLAudioElement, ev: HTMLMediaElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLMediaElementEventMap>(type: K, listener: (this: HTMLAudioElement, ev: HTMLMediaElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLAudioElement: {
-    prototype: HTMLAudioElement;
-    new(): HTMLAudioElement;
-};
-
-interface HTMLBRElement extends HTMLElement {
-    /**
-     * Sets or retrieves the side on which floating objects are not to be positioned when any IHTMLBlockElement is inserted into the document.
-     */
-    /** @deprecated */
-    clear: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLBRElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLBRElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLBRElement: {
-    prototype: HTMLBRElement;
-    new(): HTMLBRElement;
-};
-
-interface HTMLBaseElement extends HTMLElement {
-    /**
-     * Gets or sets the baseline URL on which relative links are based.
-     */
-    href: string;
-    /**
-     * Sets or retrieves the window or frame at which to target content.
-     */
-    target: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLBaseElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLBaseElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLBaseElement: {
-    prototype: HTMLBaseElement;
-    new(): HTMLBaseElement;
-};
-
-interface HTMLBaseFontElement extends HTMLElement, DOML2DeprecatedColorProperty {
-    /**
-     * Sets or retrieves the current typeface family.
-     */
-    /** @deprecated */
-    face: string;
-    /**
-     * Sets or retrieves the font size of the object.
-     */
-    /** @deprecated */
-    size: number;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLBaseFontElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLBaseFontElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLBaseFontElement: {
-    prototype: HTMLBaseFontElement;
-    new(): HTMLBaseFontElement;
-};
-
-interface HTMLBodyElementEventMap extends HTMLElementEventMap, WindowEventHandlersEventMap {
-    "blur": FocusEvent;
-    "error": ErrorEvent;
-    "focus": FocusEvent;
-    "load": Event;
-    "orientationchange": Event;
-    "resize": UIEvent;
-    "scroll": UIEvent;
-}
-
-interface HTMLBodyElement extends HTMLElement, WindowEventHandlers {
-    /** @deprecated */
-    aLink: string;
-    /** @deprecated */
-    background: string;
-    /** @deprecated */
-    bgColor: string;
-    bgProperties: string;
-    /** @deprecated */
-    link: string;
-    /** @deprecated */
-    noWrap: boolean;
-    onorientationchange: ((this: HTMLBodyElement, ev: Event) => any) | null;
-    onresize: ((this: HTMLBodyElement, ev: UIEvent) => any) | null;
-    /** @deprecated */
-    text: string;
-    /** @deprecated */
-    vLink: string;
-    addEventListener<K extends keyof HTMLBodyElementEventMap>(type: K, listener: (this: HTMLBodyElement, ev: HTMLBodyElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLBodyElementEventMap>(type: K, listener: (this: HTMLBodyElement, ev: HTMLBodyElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLBodyElement: {
-    prototype: HTMLBodyElement;
-    new(): HTMLBodyElement;
-};
-
-interface HTMLButtonElement extends HTMLElement {
-    /**
-     * Provides a way to direct a user to a specific field when a document loads. This can provide both direction and convenience for a user, reducing the need to click or tab to a field when a page opens. This attribute is true when present on an element, and false when missing.
-     */
-    autofocus: boolean;
-    disabled: boolean;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Overrides the action attribute (where the data on a form is sent) on the parent form element.
-     */
-    formAction: string;
-    /**
-     * Used to override the encoding (formEnctype attribute) specified on the form element.
-     */
-    formEnctype: string;
-    /**
-     * Overrides the submit method attribute previously specified on a form element.
-     */
-    formMethod: string;
-    /**
-     * Overrides any validation or required attributes on a form or form elements to allow it to be submitted without validation. This can be used to create a "save draft"-type submit option.
-     */
-    formNoValidate: boolean;
-    /**
-     * Overrides the target attribute on a form element.
-     */
-    formTarget: string;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    name: string;
-    status: any;
-    /**
-     * Gets the classification and default behavior of the button.
-     */
-    type: string;
-    /**
-     * Returns the error message that would be displayed if the user submits the form, or an empty string if no error message. It also triggers the standard error message, such as "this is a required field". The result is that the user sees validation messages without actually submitting.
-     */
-    readonly validationMessage: string;
-    /**
-     * Returns a  ValidityState object that represents the validity states of an element.
-     */
-    readonly validity: ValidityState;
-    /**
-     * Sets or retrieves the default or selected value of the control.
-     */
-    value: string;
-    /**
-     * Returns whether an element will successfully validate based on forms validation rules and constraints.
-     */
-    readonly willValidate: boolean;
-    /**
-     * Returns whether a form will validate when it is submitted, without having to submit it.
-     */
-    checkValidity(): boolean;
-    /**
-     * Sets a custom error message that is displayed when a form is submitted.
-     * @param error Sets a custom error message that is displayed when a form is submitted.
-     */
-    setCustomValidity(error: string): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLButtonElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLButtonElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLButtonElement: {
-    prototype: HTMLButtonElement;
-    new(): HTMLButtonElement;
-};
-
-interface HTMLCanvasElement extends HTMLElement {
-    /**
-     * Gets or sets the height of a canvas element on a document.
-     */
-    height: number;
-    /**
-     * Gets or sets the width of a canvas element on a document.
-     */
-    width: number;
-    /**
-     * Returns an object that provides methods and properties for drawing and manipulating images and graphics on a canvas element in a document. A context object includes information about colors, line widths, fonts, and other graphic parameters that can be drawn on a canvas.
-     * @param contextId The identifier (ID) of the type of canvas to create. Internet Explorer 9 and Internet Explorer 10 support only a 2-D context using canvas.getContext("2d"); IE11 Preview also supports 3-D or WebGL context using canvas.getContext("experimental-webgl");
-     */
-    getContext(contextId: "2d", contextAttributes?: Canvas2DContextAttributes): CanvasRenderingContext2D | null;
-    getContext(contextId: "webgl" | "experimental-webgl", contextAttributes?: WebGLContextAttributes): WebGLRenderingContext | null;
-    getContext(contextId: string, contextAttributes?: {}): CanvasRenderingContext2D | WebGLRenderingContext | null;
-    /**
-     * Returns a blob object encoded as a Portable Network Graphics (PNG) format from a canvas image or drawing.
-     */
-    msToBlob(): Blob;
-    toBlob(callback: (result: Blob | null) => void, type?: string, ...arguments: any[]): void;
-    /**
-     * Returns the content of the current canvas as an image that you can use as a source for another canvas or an HTML element.
-     * @param type The standard MIME type for the image format to return. If you do not specify this parameter, the default value is a PNG format image.
-     */
-    toDataURL(type?: string, ...args: any[]): string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLCanvasElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLCanvasElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLCanvasElement: {
-    prototype: HTMLCanvasElement;
-    new(): HTMLCanvasElement;
-};
-
-interface HTMLCollectionBase {
-    /**
-     * Sets or retrieves the number of objects in a collection.
-     */
-    readonly length: number;
-    /**
-     * Retrieves an object from various collections.
-     */
-    item(index: number): Element;
-    [index: number]: Element;
-}
-
-interface HTMLCollection extends HTMLCollectionBase {
-    /**
-     * Retrieves a select object or an object from an options collection.
-     */
-    namedItem(name: string): Element | null;
-}
-
-declare var HTMLCollection: {
-    prototype: HTMLCollection;
-    new(): HTMLCollection;
-};
-
-interface HTMLCollectionOf<T extends Element> extends HTMLCollectionBase {
-    item(index: number): T;
-    namedItem(name: string): T;
-    [index: number]: T;
-}
-
-interface HTMLDListElement extends HTMLElement {
-    /** @deprecated */
-    compact: boolean;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDListElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDListElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLDListElement: {
-    prototype: HTMLDListElement;
-    new(): HTMLDListElement;
-};
-
-interface HTMLDataElement extends HTMLElement {
-    value: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDataElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDataElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLDataElement: {
-    prototype: HTMLDataElement;
-    new(): HTMLDataElement;
-};
-
-interface HTMLDataListElement extends HTMLElement {
-    readonly options: HTMLCollectionOf<HTMLOptionElement>;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDataListElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDataListElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLDataListElement: {
-    prototype: HTMLDataListElement;
-    new(): HTMLDataListElement;
-};
-
-interface HTMLDetailsElement extends HTMLElement {
-    open: boolean;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDetailsElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDetailsElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLDetailsElement: {
-    prototype: HTMLDetailsElement;
-    new(): HTMLDetailsElement;
-};
-
-interface HTMLDialogElement extends HTMLElement {
-    open: boolean;
-    returnValue: string;
-    close(returnValue?: string): void;
-    show(): void;
-    showModal(): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDialogElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDialogElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLDialogElement: {
-    prototype: HTMLDialogElement;
-    new(): HTMLDialogElement;
-};
-
-interface HTMLDirectoryElement extends HTMLElement {
-    compact: boolean;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDirectoryElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDirectoryElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLDirectoryElement: {
-    prototype: HTMLDirectoryElement;
-    new(): HTMLDirectoryElement;
-};
-
-interface HTMLDivElement extends HTMLElement {
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    /** @deprecated */
-    align: string;
-    /**
-     * Sets or retrieves whether the browser automatically performs wordwrap.
-     */
-    noWrap: boolean;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDivElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDivElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLDivElement: {
-    prototype: HTMLDivElement;
-    new(): HTMLDivElement;
-};
-
-interface HTMLDocument extends Document {
-    addEventListener<K extends keyof DocumentEventMap>(type: K, listener: (this: HTMLDocument, ev: DocumentEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof DocumentEventMap>(type: K, listener: (this: HTMLDocument, ev: DocumentEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLDocument: {
-    prototype: HTMLDocument;
-    new(): HTMLDocument;
-};
-
-interface HTMLElementEventMap extends ElementEventMap {
-    "abort": UIEvent;
-    "activate": Event;
-    "beforeactivate": Event;
-    "beforecopy": Event;
-    "beforecut": Event;
-    "beforedeactivate": Event;
-    "beforepaste": Event;
-    "blur": FocusEvent;
-    "canplay": Event;
-    "canplaythrough": Event;
-    "change": Event;
-    "click": MouseEvent;
-    "contextmenu": PointerEvent;
-    "copy": ClipboardEvent;
-    "cuechange": Event;
-    "cut": ClipboardEvent;
-    "dblclick": MouseEvent;
-    "deactivate": Event;
-    "drag": DragEvent;
-    "dragend": DragEvent;
-    "dragenter": DragEvent;
-    "dragleave": DragEvent;
-    "dragover": DragEvent;
-    "dragstart": DragEvent;
-    "drop": DragEvent;
-    "durationchange": Event;
-    "emptied": Event;
-    "ended": Event;
-    "error": ErrorEvent;
-    "focus": FocusEvent;
-    "input": Event;
-    "invalid": Event;
-    "keydown": KeyboardEvent;
-    "keypress": KeyboardEvent;
-    "keyup": KeyboardEvent;
-    "load": Event;
-    "loadeddata": Event;
-    "loadedmetadata": Event;
-    "loadstart": Event;
-    "mousedown": MouseEvent;
-    "mouseenter": MouseEvent;
-    "mouseleave": MouseEvent;
-    "mousemove": MouseEvent;
-    "mouseout": MouseEvent;
-    "mouseover": MouseEvent;
-    "mouseup": MouseEvent;
-    "mousewheel": WheelEvent;
-    "MSContentZoom": Event;
-    "MSManipulationStateChanged": Event;
-    "paste": ClipboardEvent;
-    "pause": Event;
-    "play": Event;
-    "playing": Event;
-    "progress": ProgressEvent;
-    "ratechange": Event;
-    "reset": Event;
-    "scroll": UIEvent;
-    "seeked": Event;
-    "seeking": Event;
-    "select": UIEvent;
-    "selectstart": Event;
-    "stalled": Event;
-    "submit": Event;
-    "suspend": Event;
-    "timeupdate": Event;
-    "volumechange": Event;
-    "waiting": Event;
-}
-
-interface HTMLElement extends Element, ElementCSSInlineStyle {
-    accessKey: string;
-    contentEditable: string;
-    readonly dataset: DOMStringMap;
-    dir: string;
-    draggable: boolean;
-    hidden: boolean;
-    hideFocus: boolean;
-    innerText: string;
-    readonly isContentEditable: boolean;
-    lang: string;
-    readonly offsetHeight: number;
-    readonly offsetLeft: number;
-    readonly offsetParent: Element;
-    readonly offsetTop: number;
-    readonly offsetWidth: number;
-    onabort: ((this: HTMLElement, ev: UIEvent) => any) | null;
-    onactivate: ((this: HTMLElement, ev: Event) => any) | null;
-    onbeforeactivate: ((this: HTMLElement, ev: Event) => any) | null;
-    onbeforecopy: ((this: HTMLElement, ev: Event) => any) | null;
-    onbeforecut: ((this: HTMLElement, ev: Event) => any) | null;
-    onbeforedeactivate: ((this: HTMLElement, ev: Event) => any) | null;
-    onbeforepaste: ((this: HTMLElement, ev: Event) => any) | null;
-    onblur: ((this: HTMLElement, ev: FocusEvent) => any) | null;
-    oncanplay: ((this: HTMLElement, ev: Event) => any) | null;
-    oncanplaythrough: ((this: HTMLElement, ev: Event) => any) | null;
-    onchange: ((this: HTMLElement, ev: Event) => any) | null;
-    onclick: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    oncontextmenu: ((this: HTMLElement, ev: PointerEvent) => any) | null;
-    oncopy: ((this: HTMLElement, ev: ClipboardEvent) => any) | null;
-    oncuechange: ((this: HTMLElement, ev: Event) => any) | null;
-    oncut: ((this: HTMLElement, ev: ClipboardEvent) => any) | null;
-    ondblclick: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    ondeactivate: ((this: HTMLElement, ev: Event) => any) | null;
-    ondrag: ((this: HTMLElement, ev: DragEvent) => any) | null;
-    ondragend: ((this: HTMLElement, ev: DragEvent) => any) | null;
-    ondragenter: ((this: HTMLElement, ev: DragEvent) => any) | null;
-    ondragleave: ((this: HTMLElement, ev: DragEvent) => any) | null;
-    ondragover: ((this: HTMLElement, ev: DragEvent) => any) | null;
-    ondragstart: ((this: HTMLElement, ev: DragEvent) => any) | null;
-    ondrop: ((this: HTMLElement, ev: DragEvent) => any) | null;
-    ondurationchange: ((this: HTMLElement, ev: Event) => any) | null;
-    onemptied: ((this: HTMLElement, ev: Event) => any) | null;
-    onended: ((this: HTMLElement, ev: Event) => any) | null;
-    onerror: ((this: HTMLElement, ev: ErrorEvent) => any) | null;
-    onfocus: ((this: HTMLElement, ev: FocusEvent) => any) | null;
-    oninput: ((this: HTMLElement, ev: Event) => any) | null;
-    oninvalid: ((this: HTMLElement, ev: Event) => any) | null;
-    onkeydown: ((this: HTMLElement, ev: KeyboardEvent) => any) | null;
-    onkeypress: ((this: HTMLElement, ev: KeyboardEvent) => any) | null;
-    onkeyup: ((this: HTMLElement, ev: KeyboardEvent) => any) | null;
-    onload: ((this: HTMLElement, ev: Event) => any) | null;
-    onloadeddata: ((this: HTMLElement, ev: Event) => any) | null;
-    onloadedmetadata: ((this: HTMLElement, ev: Event) => any) | null;
-    onloadstart: ((this: HTMLElement, ev: Event) => any) | null;
-    onmousedown: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    onmouseenter: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    onmouseleave: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    onmousemove: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    onmouseout: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    onmouseover: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    onmouseup: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    onmousewheel: ((this: HTMLElement, ev: WheelEvent) => any) | null;
-    onmscontentzoom: ((this: HTMLElement, ev: Event) => any) | null;
-    onmsmanipulationstatechanged: ((this: HTMLElement, ev: Event) => any) | null;
-    onpaste: ((this: HTMLElement, ev: ClipboardEvent) => any) | null;
-    onpause: ((this: HTMLElement, ev: Event) => any) | null;
-    onplay: ((this: HTMLElement, ev: Event) => any) | null;
-    onplaying: ((this: HTMLElement, ev: Event) => any) | null;
-    onprogress: ((this: HTMLElement, ev: ProgressEvent) => any) | null;
-    onratechange: ((this: HTMLElement, ev: Event) => any) | null;
-    onreset: ((this: HTMLElement, ev: Event) => any) | null;
-    onscroll: ((this: HTMLElement, ev: UIEvent) => any) | null;
-    onseeked: ((this: HTMLElement, ev: Event) => any) | null;
-    onseeking: ((this: HTMLElement, ev: Event) => any) | null;
-    onselect: ((this: HTMLElement, ev: UIEvent) => any) | null;
-    onselectstart: ((this: HTMLElement, ev: Event) => any) | null;
-    onstalled: ((this: HTMLElement, ev: Event) => any) | null;
-    onsubmit: ((this: HTMLElement, ev: Event) => any) | null;
-    onsuspend: ((this: HTMLElement, ev: Event) => any) | null;
-    ontimeupdate: ((this: HTMLElement, ev: Event) => any) | null;
-    onvolumechange: ((this: HTMLElement, ev: Event) => any) | null;
-    onwaiting: ((this: HTMLElement, ev: Event) => any) | null;
-    outerText: string;
-    spellcheck: boolean;
-    tabIndex: number;
-    title: string;
-    animate(keyframes: AnimationKeyFrame | AnimationKeyFrame[], options: number | AnimationOptions): Animation;
-    blur(): void;
-    click(): void;
-    dragDrop(): boolean;
-    focus(): void;
-    msGetInputContext(): MSInputMethodContext;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLElement: {
-    prototype: HTMLElement;
-    new(): HTMLElement;
-};
-
-interface HTMLEmbedElement extends HTMLElement, GetSVGDocument {
-    /**
-     * Sets or retrieves the height of the object.
-     */
-    height: string;
-    hidden: any;
-    /**
-     * Gets or sets whether the DLNA PlayTo device is available.
-     */
-    msPlayToDisabled: boolean;
-    /**
-     * Gets or sets the path to the preferred media source. This enables the Play To target device to stream the media content, which can be DRM protected, from a different location, such as a cloud media server.
-     */
-    msPlayToPreferredSourceUri: string;
-    /**
-     * Gets or sets the primary DLNA PlayTo device.
-     */
-    msPlayToPrimary: boolean;
-    /**
-     * Gets the source associated with the media element for use by the PlayToManager.
-     */
-    readonly msPlayToSource: any;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    /** @deprecated */
-    name: string;
-    /**
-     * Retrieves the palette used for the embedded document.
-     */
-    readonly palette: string;
-    /**
-     * Retrieves the URL of the plug-in used to view an embedded document.
-     */
-    readonly pluginspage: string;
-    readonly readyState: string;
-    /**
-     * Sets or retrieves a URL to be loaded by the object.
-     */
-    src: string;
-    /**
-     * Sets or retrieves the height and width units of the embed object.
-     */
-    units: string;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    width: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLEmbedElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLEmbedElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLEmbedElement: {
-    prototype: HTMLEmbedElement;
-    new(): HTMLEmbedElement;
-};
-
-interface HTMLFieldSetElement extends HTMLElement {
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    align: string;
-    disabled: boolean;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    name: string;
-    /**
-     * Returns the error message that would be displayed if the user submits the form, or an empty string if no error message. It also triggers the standard error message, such as "this is a required field". The result is that the user sees validation messages without actually submitting.
-     */
-    readonly validationMessage: string;
-    /**
-     * Returns a  ValidityState object that represents the validity states of an element.
-     */
-    readonly validity: ValidityState;
-    /**
-     * Returns whether an element will successfully validate based on forms validation rules and constraints.
-     */
-    readonly willValidate: boolean;
-    /**
-     * Returns whether a form will validate when it is submitted, without having to submit it.
-     */
-    checkValidity(): boolean;
-    /**
-     * Sets a custom error message that is displayed when a form is submitted.
-     * @param error Sets a custom error message that is displayed when a form is submitted.
-     */
-    setCustomValidity(error: string): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLFieldSetElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLFieldSetElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLFieldSetElement: {
-    prototype: HTMLFieldSetElement;
-    new(): HTMLFieldSetElement;
-};
-
-interface HTMLFontElement extends HTMLElement, DOML2DeprecatedColorProperty, DOML2DeprecatedSizeProperty {
-    /**
-     * Sets or retrieves the current typeface family.
-     */
-    /** @deprecated */
-    face: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLFontElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLFontElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLFontElement: {
-    prototype: HTMLFontElement;
-    new(): HTMLFontElement;
-};
-
-interface HTMLFormControlsCollection extends HTMLCollectionBase {
-    namedItem(name: string): HTMLCollection | Element | null;
-}
-
-declare var HTMLFormControlsCollection: {
-    prototype: HTMLFormControlsCollection;
-    new(): HTMLFormControlsCollection;
-};
-
-interface HTMLFormElement extends HTMLElement {
-    /**
-     * Sets or retrieves a list of character encodings for input data that must be accepted by the server processing the form.
-     */
-    acceptCharset: string;
-    /**
-     * Sets or retrieves the URL to which the form content is sent for processing.
-     */
-    action: string;
-    /**
-     * Specifies whether autocomplete is applied to an editable text field.
-     */
-    autocomplete: string;
-    /**
-     * Retrieves a collection, in source order, of all controls in a given form.
-     */
-    readonly elements: HTMLFormControlsCollection;
-    /**
-     * Sets or retrieves the MIME encoding for the form.
-     */
-    encoding: string;
-    /**
-     * Sets or retrieves the encoding type for the form.
-     */
-    enctype: string;
-    /**
-     * Sets or retrieves the number of objects in a collection.
-     */
-    readonly length: number;
-    /**
-     * Sets or retrieves how to send the form data to the server.
-     */
-    method: string;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    name: string;
-    /**
-     * Designates a form that is not validated when submitted.
-     */
-    noValidate: boolean;
-    /**
-     * Sets or retrieves the window or frame at which to target content.
-     */
-    target: string;
-    /**
-     * Returns whether a form will validate when it is submitted, without having to submit it.
-     */
-    checkValidity(): boolean;
-    /**
-     * Retrieves a form object or an object from an elements collection.
-     * @param name Variant of type Number or String that specifies the object or collection to retrieve. If this parameter is a Number, it is the zero-based index of the object. If this parameter is a string, all objects with matching name or id properties are retrieved, and a collection is returned if more than one match is made.
-     * @param index Variant of type Number that specifies the zero-based index of the object to retrieve when a collection is returned.
-     */
-    item(name?: any, index?: any): any;
-    /**
-     * Retrieves a form object or an object from an elements collection.
-     */
-    namedItem(name: string): any;
-    reportValidity(): boolean;
-    /**
-     * Fires when the user resets a form.
-     */
-    reset(): void;
-    /**
-     * Fires when a FORM is about to be submitted.
-     */
-    submit(): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLFormElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLFormElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-    [name: string]: any;
-}
-
-declare var HTMLFormElement: {
-    prototype: HTMLFormElement;
-    new(): HTMLFormElement;
-};
-
-interface HTMLFrameElementEventMap extends HTMLElementEventMap {
-    "load": Event;
-}
-
-interface HTMLFrameElement extends HTMLElement, GetSVGDocument {
-    /**
-     * Specifies the properties of a border drawn around an object.
-     */
-    border: string;
-    /**
-     * Sets or retrieves the border color of the object.
-     */
-    borderColor: any;
-    /**
-     * Retrieves the document object of the page or frame.
-     */
-    /** @deprecated */
-    readonly contentDocument: Document | null;
-    /**
-     * Retrieves the object of the specified.
-     */
-    /** @deprecated */
-    readonly contentWindow: Window | null;
-    /**
-     * Sets or retrieves whether to display a border for the frame.
-     */
-    /** @deprecated */
-    frameBorder: string;
-    /**
-     * Sets or retrieves the amount of additional space between the frames.
-     */
-    frameSpacing: any;
-    /**
-     * Sets or retrieves the height of the object.
-     */
-    height: string | number;
-    /**
-     * Sets or retrieves a URI to a long description of the object.
-     */
-    /** @deprecated */
-    longDesc: string;
-    /**
-     * Sets or retrieves the top and bottom margin heights before displaying the text in a frame.
-     */
-    /** @deprecated */
-    marginHeight: string;
-    /**
-     * Sets or retrieves the left and right margin widths before displaying the text in a frame.
-     */
-    /** @deprecated */
-    marginWidth: string;
-    /**
-     * Sets or retrieves the frame name.
-     */
-    /** @deprecated */
-    name: string;
-    /**
-     * Sets or retrieves whether the user can resize the frame.
-     */
-    /** @deprecated */
-    noResize: boolean;
-    /**
-     * Sets or retrieves whether the frame can be scrolled.
-     */
-    /** @deprecated */
-    scrolling: string;
-    /**
-     * Sets or retrieves a URL to be loaded by the object.
-     */
-    /** @deprecated */
-    src: string;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    width: string | number;
-    addEventListener<K extends keyof HTMLFrameElementEventMap>(type: K, listener: (this: HTMLFrameElement, ev: HTMLFrameElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLFrameElementEventMap>(type: K, listener: (this: HTMLFrameElement, ev: HTMLFrameElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLFrameElement: {
-    prototype: HTMLFrameElement;
-    new(): HTMLFrameElement;
-};
-
-interface HTMLFrameSetElementEventMap extends HTMLElementEventMap, WindowEventHandlersEventMap {
-    "blur": FocusEvent;
-    "error": ErrorEvent;
-    "focus": FocusEvent;
-    "load": Event;
-    "orientationchange": Event;
-    "resize": UIEvent;
-    "scroll": UIEvent;
-}
-
-interface HTMLFrameSetElement extends HTMLElement, WindowEventHandlers {
-    /**
-     * Sets or retrieves the frame widths of the object.
-     */
-    /** @deprecated */
-    cols: string;
-    name: string;
-    onorientationchange: ((this: HTMLFrameSetElement, ev: Event) => any) | null;
-    onresize: ((this: HTMLFrameSetElement, ev: UIEvent) => any) | null;
-    /**
-     * Sets or retrieves the frame heights of the object.
-     */
-    /** @deprecated */
-    rows: string;
-    addEventListener<K extends keyof HTMLFrameSetElementEventMap>(type: K, listener: (this: HTMLFrameSetElement, ev: HTMLFrameSetElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLFrameSetElementEventMap>(type: K, listener: (this: HTMLFrameSetElement, ev: HTMLFrameSetElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLFrameSetElement: {
-    prototype: HTMLFrameSetElement;
-    new(): HTMLFrameSetElement;
-};
-
-interface HTMLHRElement extends HTMLElement, DOML2DeprecatedColorProperty, DOML2DeprecatedSizeProperty {
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    /** @deprecated */
-    align: string;
-    /**
-     * Sets or retrieves whether the horizontal rule is drawn with 3-D shading.
-     */
-    /** @deprecated */
-    noShade: boolean;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    /** @deprecated */
-    width: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLHRElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLHRElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLHRElement: {
-    prototype: HTMLHRElement;
-    new(): HTMLHRElement;
-};
-
-interface HTMLHeadElement extends HTMLElement {
-    /** @deprecated */
-    profile: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLHeadElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLHeadElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLHeadElement: {
-    prototype: HTMLHeadElement;
-    new(): HTMLHeadElement;
-};
-
-interface HTMLHeadingElement extends HTMLElement {
-    /**
-     * Sets or retrieves a value that indicates the table alignment.
-     */
-    /** @deprecated */
-    align: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLHeadingElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLHeadingElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLHeadingElement: {
-    prototype: HTMLHeadingElement;
-    new(): HTMLHeadingElement;
-};
-
-interface HTMLHtmlElement extends HTMLElement {
-    /**
-     * Sets or retrieves the DTD version that governs the current document.
-     */
-    /** @deprecated */
-    version: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLHtmlElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLHtmlElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLHtmlElement: {
-    prototype: HTMLHtmlElement;
-    new(): HTMLHtmlElement;
-};
-
-interface HTMLHyperlinkElementUtils {
-    hash: string;
-    host: string;
-    hostname: string;
-    href: string;
-    origin: string;
-    pathname: string;
-    port: string;
-    protocol: string;
-    search: string;
-    toString(): string;
-}
-
-interface HTMLIFrameElementEventMap extends HTMLElementEventMap {
-    "load": Event;
-}
-
-interface HTMLIFrameElement extends HTMLElement, GetSVGDocument {
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    /** @deprecated */
-    align: string;
-    allowFullscreen: boolean;
-    allowPaymentRequest: boolean;
-    /**
-     * Retrieves the document object of the page or frame.
-     */
-    readonly contentDocument: Document | null;
-    /**
-     * Retrieves the object of the specified.
-     */
-    readonly contentWindow: Window | null;
-    /**
-     * Sets or retrieves whether to display a border for the frame.
-     */
-    /** @deprecated */
-    frameBorder: string;
-    /**
-     * Sets or retrieves the height of the object.
-     */
-    height: string;
-    /**
-     * Sets or retrieves a URI to a long description of the object.
-     */
-    /** @deprecated */
-    longDesc: string;
-    /**
-     * Sets or retrieves the top and bottom margin heights before displaying the text in a frame.
-     */
-    /** @deprecated */
-    marginHeight: string;
-    /**
-     * Sets or retrieves the left and right margin widths before displaying the text in a frame.
-     */
-    /** @deprecated */
-    marginWidth: string;
-    /**
-     * Sets or retrieves the frame name.
-     */
-    name: string;
-    readonly sandbox: DOMTokenList;
-    /**
-     * Sets or retrieves whether the frame can be scrolled.
-     */
-    /** @deprecated */
-    scrolling: string;
-    /**
-     * Sets or retrieves a URL to be loaded by the object.
-     */
-    src: string;
-    /**
-     * Sets or retrives the content of the page that is to contain.
-     */
-    srcdoc: string;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    width: string;
-    addEventListener<K extends keyof HTMLIFrameElementEventMap>(type: K, listener: (this: HTMLIFrameElement, ev: HTMLIFrameElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLIFrameElementEventMap>(type: K, listener: (this: HTMLIFrameElement, ev: HTMLIFrameElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLIFrameElement: {
-    prototype: HTMLIFrameElement;
-    new(): HTMLIFrameElement;
-};
-
-interface HTMLImageElement extends HTMLElement {
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    /** @deprecated */
-    align: string;
-    /**
-     * Sets or retrieves a text alternative to the graphic.
-     */
-    alt: string;
-    /**
-     * Specifies the properties of a border drawn around an object.
-     */
-    /** @deprecated */
-    border: string;
-    /**
-     * Retrieves whether the object is fully loaded.
-     */
-    readonly complete: boolean;
-    crossOrigin: string | null;
-    readonly currentSrc: string;
-    decoding: "async" | "sync" | "auto";
-    /**
-     * Sets or retrieves the height of the object.
-     */
-    height: number;
-    /**
-     * Sets or retrieves the width of the border to draw around the object.
-     */
-    /** @deprecated */
-    hspace: number;
-    /**
-     * Sets or retrieves whether the image is a server-side image map.
-     */
-    isMap: boolean;
-    /**
-     * Sets or retrieves a Uniform Resource Identifier (URI) to a long description of the object.
-     */
-    longDesc: string;
-    /** @deprecated */
-    lowsrc: string;
-    /**
-     * Gets or sets whether the DLNA PlayTo device is available.
-     */
-    msPlayToDisabled: boolean;
-    msPlayToPreferredSourceUri: string;
-    /**
-     * Gets or sets the primary DLNA PlayTo device.
-     */
-    msPlayToPrimary: boolean;
-    /**
-     * Gets the source associated with the media element for use by the PlayToManager.
-     */
-    readonly msPlayToSource: any;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    /** @deprecated */
-    name: string;
-    /**
-     * The original height of the image resource before sizing.
-     */
-    readonly naturalHeight: number;
-    /**
-     * The original width of the image resource before sizing.
-     */
-    readonly naturalWidth: number;
-    sizes: string;
-    /**
-     * The address or URL of the a media resource that is to be considered.
-     */
-    src: string;
-    srcset: string;
-    /**
-     * Sets or retrieves the URL, often with a bookmark extension (#name), to use as a client-side image map.
-     */
-    useMap: string;
-    /**
-     * Sets or retrieves the vertical margin for the object.
-     */
-    /** @deprecated */
-    vspace: number;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    width: number;
-    readonly x: number;
-    readonly y: number;
-    msGetAsCastingSource(): any;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLImageElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLImageElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLImageElement: {
-    prototype: HTMLImageElement;
-    new(): HTMLImageElement;
-};
-
-interface HTMLInputElement extends HTMLElement {
-    /**
-     * Sets or retrieves a comma-separated list of content types.
-     */
-    accept: string;
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    /** @deprecated */
-    align: string;
-    /**
-     * Sets or retrieves a text alternative to the graphic.
-     */
-    alt: string;
-    /**
-     * Specifies whether autocomplete is applied to an editable text field.
-     */
-    autocomplete: string;
-    /**
-     * Provides a way to direct a user to a specific field when a document loads. This can provide both direction and convenience for a user, reducing the need to click or tab to a field when a page opens. This attribute is true when present on an element, and false when missing.
-     */
-    autofocus: boolean;
-    /**
-     * Sets or retrieves the state of the check box or radio button.
-     */
-    checked: boolean;
-    /**
-     * Sets or retrieves the state of the check box or radio button.
-     */
-    defaultChecked: boolean;
-    /**
-     * Sets or retrieves the initial contents of the object.
-     */
-    defaultValue: string;
-    disabled: boolean;
-    /**
-     * Returns a FileList object on a file type input object.
-     */
-    files: FileList | null;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Overrides the action attribute (where the data on a form is sent) on the parent form element.
-     */
-    formAction: string;
-    /**
-     * Used to override the encoding (formEnctype attribute) specified on the form element.
-     */
-    formEnctype: string;
-    /**
-     * Overrides the submit method attribute previously specified on a form element.
-     */
-    formMethod: string;
-    /**
-     * Overrides any validation or required attributes on a form or form elements to allow it to be submitted without validation. This can be used to create a "save draft"-type submit option.
-     */
-    formNoValidate: boolean;
-    /**
-     * Overrides the target attribute on a form element.
-     */
-    formTarget: string;
-    /**
-     * Sets or retrieves the height of the object.
-     */
-    height: number;
-    indeterminate: boolean;
-    /**
-     * Specifies the ID of a pre-defined datalist of options for an input element.
-     */
-    readonly list: HTMLElement | null;
-    /**
-     * Defines the maximum acceptable value for an input element with type="number".When used with the min and step attributes, lets you control the range and increment (such as only even numbers) that the user can enter into an input field.
-     */
-    max: string;
-    /**
-     * Sets or retrieves the maximum number of characters that the user can enter in a text control.
-     */
-    maxLength: number;
-    /**
-     * Defines the minimum acceptable value for an input element with type="number". When used with the max and step attributes, lets you control the range and increment (such as even numbers only) that the user can enter into an input field.
-     */
-    min: string;
-    minLength: number;
-    /**
-     * Sets or retrieves the Boolean value indicating whether multiple items can be selected from a list.
-     */
-    multiple: boolean;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    name: string;
-    /**
-     * Gets or sets a string containing a regular expression that the user's input must match.
-     */
-    pattern: string;
-    /**
-     * Gets or sets a text string that is displayed in an input field as a hint or prompt to users as the format or type of information they need to enter.The text appears in an input field until the user puts focus on the field.
-     */
-    placeholder: string;
-    readOnly: boolean;
-    /**
-     * When present, marks an element that can't be submitted without a value.
-     */
-    required: boolean;
-    selectionDirection: string | null;
-    /**
-     * Gets or sets the end position or offset of a text selection.
-     */
-    selectionEnd: number | null;
-    /**
-     * Gets or sets the starting position or offset of a text selection.
-     */
-    selectionStart: number | null;
-    size: number;
-    /**
-     * The address or URL of the a media resource that is to be considered.
-     */
-    src: string;
-    /**
-     * Defines an increment or jump between values that you want to allow the user to enter. When used with the max and min attributes, lets you control the range and increment (for example, allow only even numbers) that the user can enter into an input field.
-     */
-    step: string;
-    /**
-     * Returns the content type of the object.
-     */
-    type: string;
-    /**
-     * Sets or retrieves the URL, often with a bookmark extension (#name), to use as a client-side image map.
-     */
-    /** @deprecated */
-    useMap: string;
-    /**
-     * Returns the error message that would be displayed if the user submits the form, or an empty string if no error message. It also triggers the standard error message, such as "this is a required field". The result is that the user sees validation messages without actually submitting.
-     */
-    readonly validationMessage: string;
-    /**
-     * Returns a  ValidityState object that represents the validity states of an element.
-     */
-    readonly validity: ValidityState;
-    /**
-     * Returns the value of the data at the cursor's current position.
-     */
-    value: string;
-    valueAsDate: any;
-    /**
-     * Returns the input field value as a number.
-     */
-    valueAsNumber: number;
-    webkitdirectory: boolean;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    width: number;
-    /**
-     * Returns whether an element will successfully validate based on forms validation rules and constraints.
-     */
-    readonly willValidate: boolean;
-    /**
-     * Returns whether a form will validate when it is submitted, without having to submit it.
-     */
-    checkValidity(): boolean;
-    /**
-     * Makes the selection equal to the current object.
-     */
-    select(): void;
-    /**
-     * Sets a custom error message that is displayed when a form is submitted.
-     * @param error Sets a custom error message that is displayed when a form is submitted.
-     */
-    setCustomValidity(error: string): void;
-    /**
-     * Sets the start and end positions of a selection in a text field.
-     * @param start The offset into the text field for the start of the selection.
-     * @param end The offset into the text field for the end of the selection.
-     * @param direction The direction in which the selection is performed.
-     */
-    setSelectionRange(start: number, end: number, direction?: "forward" | "backward" | "none"): void;
-    /**
-     * Decrements a range input control's value by the value given by the Step attribute. If the optional parameter is used, it will decrement the input control's step value multiplied by the parameter's value.
-     * @param n Value to decrement the value by.
-     */
-    stepDown(n?: number): void;
-    /**
-     * Increments a range input control's value by the value given by the Step attribute. If the optional parameter is used, will increment the input control's value by that value.
-     * @param n Value to increment the value by.
-     */
-    stepUp(n?: number): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLInputElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLInputElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLInputElement: {
-    prototype: HTMLInputElement;
-    new(): HTMLInputElement;
-};
-
-interface HTMLLIElement extends HTMLElement {
-    /** @deprecated */
-    type: string;
-    /**
-     * Sets or retrieves the value of a list item.
-     */
-    value: number;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLLIElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLLIElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLLIElement: {
-    prototype: HTMLLIElement;
-    new(): HTMLLIElement;
-};
-
-interface HTMLLabelElement extends HTMLElement {
-    readonly control: HTMLInputElement | null;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Sets or retrieves the object to which the given label object is assigned.
-     */
-    htmlFor: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLLabelElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLLabelElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLLabelElement: {
-    prototype: HTMLLabelElement;
-    new(): HTMLLabelElement;
-};
-
-interface HTMLLegendElement extends HTMLElement {
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    /** @deprecated */
-    align: string;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLLegendElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLLegendElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLLegendElement: {
-    prototype: HTMLLegendElement;
-    new(): HTMLLegendElement;
-};
-
-interface HTMLLinkElement extends HTMLElement, LinkStyle {
-    /**
-     * Sets or retrieves the character set used to encode the object.
-     */
-    /** @deprecated */
-    charset: string;
-    crossOrigin: string | null;
-    /** @deprecated */
-    disabled: boolean;
-    /**
-     * Sets or retrieves a destination URL or an anchor point.
-     */
-    href: string;
-    /**
-     * Sets or retrieves the language code of the object.
-     */
-    hreflang: string;
-    import?: Document;
-    integrity: string;
-    /**
-     * Sets or retrieves the media type.
-     */
-    media: string;
-    /**
-     * Sets or retrieves the relationship between the object and the destination of the link.
-     */
-    rel: string;
-    /**
-     * Sets or retrieves the relationship between the object and the destination of the link.
-     */
-    /** @deprecated */
-    rev: string;
-    /**
-     * Sets or retrieves the window or frame at which to target content.
-     */
-    /** @deprecated */
-    target: string;
-    /**
-     * Sets or retrieves the MIME type of the object.
-     */
-    type: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLLinkElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLLinkElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLLinkElement: {
-    prototype: HTMLLinkElement;
-    new(): HTMLLinkElement;
-};
-
-interface HTMLMainElement extends HTMLElement {
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMainElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMainElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLMainElement: {
-    prototype: HTMLMainElement;
-    new(): HTMLMainElement;
-};
-
-interface HTMLMapElement extends HTMLElement {
-    /**
-     * Retrieves a collection of the area objects defined for the given map object.
-     */
-    readonly areas: HTMLAreasCollection;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    name: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMapElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMapElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLMapElement: {
-    prototype: HTMLMapElement;
-    new(): HTMLMapElement;
-};
-
-interface HTMLMarqueeElementEventMap extends HTMLElementEventMap {
-    "bounce": Event;
-    "finish": Event;
-    "start": Event;
-}
-
-interface HTMLMarqueeElement extends HTMLElement {
-    /** @deprecated */
-    behavior: string;
-    /** @deprecated */
-    bgColor: string;
-    /** @deprecated */
-    direction: string;
-    /** @deprecated */
-    height: string;
-    /** @deprecated */
-    hspace: number;
-    /** @deprecated */
-    loop: number;
-    /** @deprecated */
-    onbounce: ((this: HTMLMarqueeElement, ev: Event) => any) | null;
-    /** @deprecated */
-    onfinish: ((this: HTMLMarqueeElement, ev: Event) => any) | null;
-    /** @deprecated */
-    onstart: ((this: HTMLMarqueeElement, ev: Event) => any) | null;
-    /** @deprecated */
-    scrollAmount: number;
-    /** @deprecated */
-    scrollDelay: number;
-    /** @deprecated */
-    trueSpeed: boolean;
-    /** @deprecated */
-    vspace: number;
-    /** @deprecated */
-    width: string;
-    /** @deprecated */
-    start(): void;
-    /** @deprecated */
-    stop(): void;
-    addEventListener<K extends keyof HTMLMarqueeElementEventMap>(type: K, listener: (this: HTMLMarqueeElement, ev: HTMLMarqueeElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLMarqueeElementEventMap>(type: K, listener: (this: HTMLMarqueeElement, ev: HTMLMarqueeElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLMarqueeElement: {
-    prototype: HTMLMarqueeElement;
-    new(): HTMLMarqueeElement;
-};
-
-interface HTMLMediaElementEventMap extends HTMLElementEventMap {
-    "encrypted": MediaEncryptedEvent;
-    "msneedkey": Event;
-}
-
-interface HTMLMediaElement extends HTMLElement {
-    /**
-     * Returns an AudioTrackList object with the audio tracks for a given video element.
-     */
-    readonly audioTracks: AudioTrackList;
-    /**
-     * Gets or sets a value that indicates whether to start playing the media automatically.
-     */
-    autoplay: boolean;
-    /**
-     * Gets a collection of buffered time ranges.
-     */
-    readonly buffered: TimeRanges;
-    /**
-     * Gets or sets a flag that indicates whether the client provides a set of controls for the media (in case the developer does not include controls for the player).
-     */
-    controls: boolean;
-    crossOrigin: string | null;
-    /**
-     * Gets the address or URL of the current media resource that is selected by IHTMLMediaElement.
-     */
-    readonly currentSrc: string;
-    /**
-     * Gets or sets the current playback position, in seconds.
-     */
-    currentTime: number;
-    defaultMuted: boolean;
-    /**
-     * Gets or sets the default playback rate when the user is not using fast forward or reverse for a video or audio resource.
-     */
-    defaultPlaybackRate: number;
-    /**
-     * Returns the duration in seconds of the current media resource. A NaN value is returned if duration is not available, or Infinity if the media resource is streaming.
-     */
-    readonly duration: number;
-    /**
-     * Gets information about whether the playback has ended or not.
-     */
-    readonly ended: boolean;
-    /**
-     * Returns an object representing the current error state of the audio or video element.
-     */
-    readonly error: MediaError | null;
-    /**
-     * Gets or sets a flag to specify whether playback should restart after it completes.
-     */
-    loop: boolean;
-    readonly mediaKeys: MediaKeys | null;
-    /**
-     * Specifies the purpose of the audio or video media, such as background audio or alerts.
-     */
-    msAudioCategory: string;
-    /**
-     * Specifies the output device id that the audio will be sent to.
-     */
-    msAudioDeviceType: string;
-    readonly msGraphicsTrustStatus: MSGraphicsTrust;
-    /**
-     * Gets the MSMediaKeys object, which is used for decrypting media data, that is associated with this media element.
-     */
-    /** @deprecated */
-    readonly msKeys: MSMediaKeys;
-    /**
-     * Gets or sets whether the DLNA PlayTo device is available.
-     */
-    msPlayToDisabled: boolean;
-    /**
-     * Gets or sets the path to the preferred media source. This enables the Play To target device to stream the media content, which can be DRM protected, from a different location, such as a cloud media server.
-     */
-    msPlayToPreferredSourceUri: string;
-    /**
-     * Gets or sets the primary DLNA PlayTo device.
-     */
-    msPlayToPrimary: boolean;
-    /**
-     * Gets the source associated with the media element for use by the PlayToManager.
-     */
-    readonly msPlayToSource: any;
-    /**
-     * Specifies whether or not to enable low-latency playback on the media element.
-     */
-    msRealTime: boolean;
-    /**
-     * Gets or sets a flag that indicates whether the audio (either audio or the audio track on video media) is muted.
-     */
-    muted: boolean;
-    /**
-     * Gets the current network activity for the element.
-     */
-    readonly networkState: number;
-    onencrypted: ((this: HTMLMediaElement, ev: MediaEncryptedEvent) => any) | null;
-    /** @deprecated */
-    onmsneedkey: ((this: HTMLMediaElement, ev: Event) => any) | null;
-    /**
-     * Gets a flag that specifies whether playback is paused.
-     */
-    readonly paused: boolean;
-    /**
-     * Gets or sets the current rate of speed for the media resource to play. This speed is expressed as a multiple of the normal speed of the media resource.
-     */
-    playbackRate: number;
-    /**
-     * Gets TimeRanges for the current media resource that has been played.
-     */
-    readonly played: TimeRanges;
-    /**
-     * Gets or sets the current playback position, in seconds.
-     */
-    preload: string;
-    readonly readyState: number;
-    /**
-     * Returns a TimeRanges object that represents the ranges of the current media resource that can be seeked.
-     */
-    readonly seekable: TimeRanges;
-    /**
-     * Gets a flag that indicates whether the the client is currently moving to a new playback position in the media resource.
-     */
-    readonly seeking: boolean;
-    /**
-     * The address or URL of the a media resource that is to be considered.
-     */
-    src: string;
-    srcObject: MediaStream | MediaSource | Blob | null;
-    readonly textTracks: TextTrackList;
-    readonly videoTracks: VideoTrackList;
-    /**
-     * Gets or sets the volume level for audio portions of the media element.
-     */
-    volume: number;
-    addTextTrack(kind: TextTrackKind, label?: string, language?: string): TextTrack;
-    /**
-     * Returns a string that specifies whether the client can play a given media resource type.
-     */
-    canPlayType(type: string): CanPlayTypeResult;
-    /**
-     * Resets the audio or video object and loads a new media resource.
-     */
-    load(): void;
-    /**
-     * Clears all effects from the media pipeline.
-     */
-    msClearEffects(): void;
-    msGetAsCastingSource(): any;
-    /**
-     * Inserts the specified audio effect into media pipeline.
-     */
-    msInsertAudioEffect(activatableClassId: string, effectRequired: boolean, config?: any): void;
-    /** @deprecated */
-    msSetMediaKeys(mediaKeys: MSMediaKeys): void;
-    /**
-     * Specifies the media protection manager for a given media pipeline.
-     */
-    msSetMediaProtectionManager(mediaProtectionManager?: any): void;
-    /**
-     * Pauses the current playback and sets paused to TRUE. This can be used to test whether the media is playing or paused. You can also use the pause or play events to tell whether the media is playing or not.
-     */
-    pause(): void;
-    /**
-     * Loads and starts playback of a media resource.
-     */
-    play(): Promise<void>;
-    setMediaKeys(mediaKeys: MediaKeys | null): Promise<void>;
-    readonly HAVE_CURRENT_DATA: number;
-    readonly HAVE_ENOUGH_DATA: number;
-    readonly HAVE_FUTURE_DATA: number;
-    readonly HAVE_METADATA: number;
-    readonly HAVE_NOTHING: number;
-    readonly NETWORK_EMPTY: number;
-    readonly NETWORK_IDLE: number;
-    readonly NETWORK_LOADING: number;
-    readonly NETWORK_NO_SOURCE: number;
-    addEventListener<K extends keyof HTMLMediaElementEventMap>(type: K, listener: (this: HTMLMediaElement, ev: HTMLMediaElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLMediaElementEventMap>(type: K, listener: (this: HTMLMediaElement, ev: HTMLMediaElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLMediaElement: {
-    prototype: HTMLMediaElement;
-    new(): HTMLMediaElement;
-    readonly HAVE_CURRENT_DATA: number;
-    readonly HAVE_ENOUGH_DATA: number;
-    readonly HAVE_FUTURE_DATA: number;
-    readonly HAVE_METADATA: number;
-    readonly HAVE_NOTHING: number;
-    readonly NETWORK_EMPTY: number;
-    readonly NETWORK_IDLE: number;
-    readonly NETWORK_LOADING: number;
-    readonly NETWORK_NO_SOURCE: number;
-};
-
-interface HTMLMenuElement extends HTMLElement {
-    /** @deprecated */
-    compact: boolean;
-    type: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMenuElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMenuElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLMenuElement: {
-    prototype: HTMLMenuElement;
-    new(): HTMLMenuElement;
-};
-
-interface HTMLMetaElement extends HTMLElement {
-    /**
-     * Sets or retrieves the character set used to encode the object.
-     */
-    /** @deprecated */
-    charset: string;
-    /**
-     * Gets or sets meta-information to associate with httpEquiv or name.
-     */
-    content: string;
-    /**
-     * Gets or sets information used to bind the value of a content attribute of a meta element to an HTTP response header.
-     */
-    httpEquiv: string;
-    /**
-     * Sets or retrieves the value specified in the content attribute of the meta object.
-     */
-    name: string;
-    /**
-     * Sets or retrieves a scheme to be used in interpreting the value of a property specified for the object.
-     */
-    /** @deprecated */
-    scheme: string;
-    /**
-     * Sets or retrieves the URL property that will be loaded after the specified time has elapsed.
-     */
-    /** @deprecated */
-    url: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMetaElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMetaElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLMetaElement: {
-    prototype: HTMLMetaElement;
-    new(): HTMLMetaElement;
-};
-
-interface HTMLMeterElement extends HTMLElement {
-    high: number;
-    low: number;
-    max: number;
-    min: number;
-    optimum: number;
-    value: number;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMeterElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMeterElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLMeterElement: {
-    prototype: HTMLMeterElement;
-    new(): HTMLMeterElement;
-};
-
-interface HTMLModElement extends HTMLElement {
-    /**
-     * Sets or retrieves reference information about the object.
-     */
-    cite: string;
-    /**
-     * Sets or retrieves the date and time of a modification to the object.
-     */
-    dateTime: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLModElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLModElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLModElement: {
-    prototype: HTMLModElement;
-    new(): HTMLModElement;
-};
-
-interface HTMLOListElement extends HTMLElement {
-    /** @deprecated */
-    compact: boolean;
-    /**
-     * The starting number.
-     */
-    start: number;
-    type: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLOListElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLOListElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLOListElement: {
-    prototype: HTMLOListElement;
-    new(): HTMLOListElement;
-};
-
-interface HTMLObjectElement extends HTMLElement, GetSVGDocument {
-    /**
-     * Retrieves a string of the URL where the object tag can be found. This is often the href of the document that the object is in, or the value set by a base element.
-     */
-    readonly BaseHref: string;
-    /** @deprecated */
-    align: string;
-    /**
-     * Sets or retrieves a character string that can be used to implement your own archive functionality for the object.
-     */
-    /** @deprecated */
-    archive: string;
-    /** @deprecated */
-    border: string;
-    /**
-     * Sets or retrieves the URL of the file containing the compiled Java class.
-     */
-    /** @deprecated */
-    code: string;
-    /**
-     * Sets or retrieves the URL of the component.
-     */
-    /** @deprecated */
-    codeBase: string;
-    /**
-     * Sets or retrieves the Internet media type for the code associated with the object.
-     */
-    /** @deprecated */
-    codeType: string;
-    /**
-     * Retrieves the document object of the page or frame.
-     */
-    readonly contentDocument: Document | null;
-    /**
-     * Sets or retrieves the URL that references the data of the object.
-     */
-    data: string;
-    /** @deprecated */
-    declare: boolean;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Sets or retrieves the height of the object.
-     */
-    height: string;
-    /** @deprecated */
-    hspace: number;
-    /**
-     * Gets or sets whether the DLNA PlayTo device is available.
-     */
-    msPlayToDisabled: boolean;
-    /**
-     * Gets or sets the path to the preferred media source. This enables the Play To target device to stream the media content, which can be DRM protected, from a different location, such as a cloud media server.
-     */
-    msPlayToPreferredSourceUri: string;
-    /**
-     * Gets or sets the primary DLNA PlayTo device.
-     */
-    msPlayToPrimary: boolean;
-    /**
-     * Gets the source associated with the media element for use by the PlayToManager.
-     */
-    readonly msPlayToSource: any;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    name: string;
-    readonly readyState: number;
-    /**
-     * Sets or retrieves a message to be displayed while an object is loading.
-     */
-    /** @deprecated */
-    standby: string;
-    /**
-     * Sets or retrieves the MIME type of the object.
-     */
-    type: string;
-    typemustmatch: boolean;
-    /**
-     * Sets or retrieves the URL, often with a bookmark extension (#name), to use as a client-side image map.
-     */
-    useMap: string;
-    /**
-     * Returns the error message that would be displayed if the user submits the form, or an empty string if no error message. It also triggers the standard error message, such as "this is a required field". The result is that the user sees validation messages without actually submitting.
-     */
-    readonly validationMessage: string;
-    /**
-     * Returns a  ValidityState object that represents the validity states of an element.
-     */
-    readonly validity: ValidityState;
-    /** @deprecated */
-    vspace: number;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    width: string;
-    /**
-     * Returns whether an element will successfully validate based on forms validation rules and constraints.
-     */
-    readonly willValidate: boolean;
-    /**
-     * Returns whether a form will validate when it is submitted, without having to submit it.
-     */
-    checkValidity(): boolean;
-    /**
-     * Sets a custom error message that is displayed when a form is submitted.
-     * @param error Sets a custom error message that is displayed when a form is submitted.
-     */
-    setCustomValidity(error: string): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLObjectElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLObjectElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLObjectElement: {
-    prototype: HTMLObjectElement;
-    new(): HTMLObjectElement;
-};
-
-interface HTMLOptGroupElement extends HTMLElement {
-    disabled: boolean;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Sets or retrieves a value that you can use to implement your own label functionality for the object.
-     */
-    label: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLOptGroupElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLOptGroupElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLOptGroupElement: {
-    prototype: HTMLOptGroupElement;
-    new(): HTMLOptGroupElement;
-};
-
-interface HTMLOptionElement extends HTMLElement {
-    /**
-     * Sets or retrieves the status of an option.
-     */
-    defaultSelected: boolean;
-    disabled: boolean;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Sets or retrieves the ordinal position of an option in a list box.
-     */
-    readonly index: number;
-    /**
-     * Sets or retrieves a value that you can use to implement your own label functionality for the object.
-     */
-    label: string;
-    /**
-     * Sets or retrieves whether the option in the list box is the default item.
-     */
-    selected: boolean;
-    /**
-     * Sets or retrieves the text string specified by the option tag.
-     */
-    text: string;
-    /**
-     * Sets or retrieves the value which is returned to the server when the form control is submitted.
-     */
-    value: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLOptionElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLOptionElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLOptionElement: {
-    prototype: HTMLOptionElement;
-    new(): HTMLOptionElement;
-};
-
-interface HTMLOptionsCollection extends HTMLCollectionOf<HTMLOptionElement> {
-    length: number;
-    selectedIndex: number;
-    add(element: HTMLOptionElement | HTMLOptGroupElement, before?: HTMLElement | number | null): void;
-    remove(index: number): void;
-}
-
-declare var HTMLOptionsCollection: {
-    prototype: HTMLOptionsCollection;
-    new(): HTMLOptionsCollection;
-};
-
-interface HTMLOutputElement extends HTMLElement {
-    defaultValue: string;
-    readonly form: HTMLFormElement | null;
-    readonly htmlFor: DOMTokenList;
-    name: string;
-    readonly type: string;
-    readonly validationMessage: string;
-    readonly validity: ValidityState;
-    value: string;
-    readonly willValidate: boolean;
-    checkValidity(): boolean;
-    reportValidity(): boolean;
-    setCustomValidity(error: string): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLOutputElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLOutputElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLOutputElement: {
-    prototype: HTMLOutputElement;
-    new(): HTMLOutputElement;
-};
-
-interface HTMLParagraphElement extends HTMLElement {
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    /** @deprecated */
-    align: string;
-    clear: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLParagraphElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLParagraphElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLParagraphElement: {
-    prototype: HTMLParagraphElement;
-    new(): HTMLParagraphElement;
-};
-
-interface HTMLParamElement extends HTMLElement {
-    /**
-     * Sets or retrieves the name of an input parameter for an element.
-     */
-    name: string;
-    /**
-     * Sets or retrieves the content type of the resource designated by the value attribute.
-     */
-    /** @deprecated */
-    type: string;
-    /**
-     * Sets or retrieves the value of an input parameter for an element.
-     */
-    value: string;
-    /**
-     * Sets or retrieves the data type of the value attribute.
-     */
-    /** @deprecated */
-    valueType: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLParamElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLParamElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLParamElement: {
-    prototype: HTMLParamElement;
-    new(): HTMLParamElement;
-};
-
-interface HTMLPictureElement extends HTMLElement {
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLPictureElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLPictureElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLPictureElement: {
-    prototype: HTMLPictureElement;
-    new(): HTMLPictureElement;
-};
-
-interface HTMLPreElement extends HTMLElement {
-    /**
-     * Sets or gets a value that you can use to implement your own width functionality for the object.
-     */
-    /** @deprecated */
-    width: number;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLPreElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLPreElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLPreElement: {
-    prototype: HTMLPreElement;
-    new(): HTMLPreElement;
-};
-
-interface HTMLProgressElement extends HTMLElement {
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Defines the maximum, or "done" value for a progress element.
-     */
-    max: number;
-    /**
-     * Returns the quotient of value/max when the value attribute is set (determinate progress bar), or -1 when the value attribute is missing (indeterminate progress bar).
-     */
-    readonly position: number;
-    /**
-     * Sets or gets the current value of a progress element. The value must be a non-negative number between 0 and the max value.
-     */
-    value: number;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLProgressElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLProgressElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLProgressElement: {
-    prototype: HTMLProgressElement;
-    new(): HTMLProgressElement;
-};
-
-interface HTMLQuoteElement extends HTMLElement {
-    /**
-     * Sets or retrieves reference information about the object.
-     */
-    cite: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLQuoteElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLQuoteElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLQuoteElement: {
-    prototype: HTMLQuoteElement;
-    new(): HTMLQuoteElement;
-};
-
-interface HTMLScriptElement extends HTMLElement {
-    async: boolean;
-    /**
-     * Sets or retrieves the character set used to encode the object.
-     */
-    charset: string;
-    crossOrigin: string | null;
-    /**
-     * Sets or retrieves the status of the script.
-     */
-    defer: boolean;
-    /**
-     * Sets or retrieves the event for which the script is written.
-     */
-    /** @deprecated */
-    event: string;
-    /**
-     * Sets or retrieves the object that is bound to the event script.
-     */
-    /** @deprecated */
-    htmlFor: string;
-    integrity: string;
-    noModule: boolean;
-    /**
-     * Retrieves the URL to an external file that contains the source code or data.
-     */
-    src: string;
-    /**
-     * Retrieves or sets the text of the object as a string.
-     */
-    text: string;
-    /**
-     * Sets or retrieves the MIME type for the associated scripting engine.
-     */
-    type: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLScriptElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLScriptElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLScriptElement: {
-    prototype: HTMLScriptElement;
-    new(): HTMLScriptElement;
-};
-
-interface HTMLSelectElement extends HTMLElement {
-    /**
-     * Provides a way to direct a user to a specific field when a document loads. This can provide both direction and convenience for a user, reducing the need to click or tab to a field when a page opens. This attribute is true when present on an element, and false when missing.
-     */
-    autofocus: boolean;
-    disabled: boolean;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Sets or retrieves the number of objects in a collection.
-     */
-    length: number;
-    /**
-     * Sets or retrieves the Boolean value indicating whether multiple items can be selected from a list.
-     */
-    multiple: boolean;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    name: string;
-    readonly options: HTMLOptionsCollection;
-    /**
-     * When present, marks an element that can't be submitted without a value.
-     */
-    required: boolean;
-    /**
-     * Sets or retrieves the index of the selected option in a select object.
-     */
-    selectedIndex: number;
-    readonly selectedOptions: HTMLCollectionOf<HTMLOptionElement>;
-    /**
-     * Sets or retrieves the number of rows in the list box.
-     */
-    size: number;
-    /**
-     * Retrieves the type of select control based on the value of the MULTIPLE attribute.
-     */
-    readonly type: string;
-    /**
-     * Returns the error message that would be displayed if the user submits the form, or an empty string if no error message. It also triggers the standard error message, such as "this is a required field". The result is that the user sees validation messages without actually submitting.
-     */
-    readonly validationMessage: string;
-    /**
-     * Returns a  ValidityState object that represents the validity states of an element.
-     */
-    readonly validity: ValidityState;
-    /**
-     * Sets or retrieves the value which is returned to the server when the form control is submitted.
-     */
-    value: string;
-    /**
-     * Returns whether an element will successfully validate based on forms validation rules and constraints.
-     */
-    readonly willValidate: boolean;
-    /**
-     * Adds an element to the areas, controlRange, or options collection.
-     * @param element Variant of type Number that specifies the index position in the collection where the element is placed. If no value is given, the method places the element at the end of the collection.
-     * @param before Variant of type Object that specifies an element to insert before, or null to append the object to the collection.
-     */
-    add(element: HTMLOptionElement | HTMLOptGroupElement, before?: HTMLElement | number | null): void;
-    /**
-     * Returns whether a form will validate when it is submitted, without having to submit it.
-     */
-    checkValidity(): boolean;
-    /**
-     * Retrieves a select object or an object from an options collection.
-     * @param name Variant of type Number or String that specifies the object or collection to retrieve. If this parameter is an integer, it is the zero-based index of the object. If this parameter is a string, all objects with matching name or id properties are retrieved, and a collection is returned if more than one match is made.
-     * @param index Variant of type Number that specifies the zero-based index of the object to retrieve when a collection is returned.
-     */
-    item(name?: any, index?: any): Element | null;
-    /**
-     * Retrieves a select object or an object from an options collection.
-     * @param namedItem A String that specifies the name or id property of the object to retrieve. A collection is returned if more than one match is made.
-     */
-    namedItem(name: string): any;
-    /**
-     * Removes an element from the collection.
-     * @param index Number that specifies the zero-based index of the element to remove from the collection.
-     */
-    remove(index?: number): void;
-    /**
-     * Sets a custom error message that is displayed when a form is submitted.
-     * @param error Sets a custom error message that is displayed when a form is submitted.
-     */
-    setCustomValidity(error: string): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSelectElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSelectElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-    [name: string]: any;
-}
-
-declare var HTMLSelectElement: {
-    prototype: HTMLSelectElement;
-    new(): HTMLSelectElement;
-};
-
-interface HTMLSlotElement extends HTMLElement {
-    name: string;
-    assignedNodes(options?: AssignedNodesOptions): Node[];
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSlotElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSlotElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-interface HTMLSourceElement extends HTMLElement {
-    /**
-     * Gets or sets the intended media type of the media source.
-     */
-    media: string;
-    /** @deprecated */
-    msKeySystem: string;
-    sizes: string;
-    /**
-     * The address or URL of the a media resource that is to be considered.
-     */
-    src: string;
-    srcset: string;
-    /**
-     * Gets or sets the MIME type of a media resource.
-     */
-    type: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSourceElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSourceElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLSourceElement: {
-    prototype: HTMLSourceElement;
-    new(): HTMLSourceElement;
-};
-
-interface HTMLSpanElement extends HTMLElement {
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSpanElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSpanElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLSpanElement: {
-    prototype: HTMLSpanElement;
-    new(): HTMLSpanElement;
-};
-
-interface HTMLStyleElement extends HTMLElement, LinkStyle {
-    /** @deprecated */
-    disabled: boolean;
-    /**
-     * Sets or retrieves the media type.
-     */
-    media: string;
-    /**
-     * Retrieves the CSS language in which the style sheet is written.
-     */
-    type: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLStyleElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLStyleElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLStyleElement: {
-    prototype: HTMLStyleElement;
-    new(): HTMLStyleElement;
-};
-
-interface HTMLSummaryElement extends HTMLElement {
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSummaryElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSummaryElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLSummaryElement: {
-    prototype: HTMLSummaryElement;
-    new(): HTMLSummaryElement;
-};
-
-interface HTMLTableCaptionElement extends HTMLElement {
-    /**
-     * Sets or retrieves the alignment of the caption or legend.
-     */
-    /** @deprecated */
-    align: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableCaptionElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableCaptionElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTableCaptionElement: {
-    prototype: HTMLTableCaptionElement;
-    new(): HTMLTableCaptionElement;
-};
-
-interface HTMLTableCellElement extends HTMLElement {
-    /**
-     * Sets or retrieves abbreviated text for the object.
-     */
-    abbr: string;
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    /** @deprecated */
-    align: string;
-    /**
-     * Sets or retrieves a comma-delimited list of conceptual categories associated with the object.
-     */
-    /** @deprecated */
-    axis: string;
-    /** @deprecated */
-    bgColor: string;
-    /**
-     * Retrieves the position of the object in the cells collection of a row.
-     */
-    readonly cellIndex: number;
-    /** @deprecated */
-    ch: string;
-    /** @deprecated */
-    chOff: string;
-    /**
-     * Sets or retrieves the number columns in the table that the object should span.
-     */
-    colSpan: number;
-    /**
-     * Sets or retrieves a list of header cells that provide information for the object.
-     */
-    headers: string;
-    /**
-     * Sets or retrieves the height of the object.
-     */
-    /** @deprecated */
-    height: string;
-    /**
-     * Sets or retrieves whether the browser automatically performs wordwrap.
-     */
-    /** @deprecated */
-    noWrap: boolean;
-    /**
-     * Sets or retrieves how many rows in a table the cell should span.
-     */
-    rowSpan: number;
-    /**
-     * Sets or retrieves the group of cells in a table to which the object's information applies.
-     */
-    scope: string;
-    /** @deprecated */
-    vAlign: string;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    /** @deprecated */
-    width: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableCellElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableCellElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTableCellElement: {
-    prototype: HTMLTableCellElement;
-    new(): HTMLTableCellElement;
-};
-
-interface HTMLTableColElement extends HTMLElement {
-    /**
-     * Sets or retrieves the alignment of the object relative to the display or table.
-     */
-    /** @deprecated */
-    align: string;
-    /** @deprecated */
-    ch: string;
-    /** @deprecated */
-    chOff: string;
-    /**
-     * Sets or retrieves the number of columns in the group.
-     */
-    span: number;
-    /** @deprecated */
-    vAlign: string;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    /** @deprecated */
-    width: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableColElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableColElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTableColElement: {
-    prototype: HTMLTableColElement;
-    new(): HTMLTableColElement;
-};
-
-interface HTMLTableDataCellElement extends HTMLTableCellElement {
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableDataCellElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableDataCellElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTableDataCellElement: {
-    prototype: HTMLTableDataCellElement;
-    new(): HTMLTableDataCellElement;
-};
-
-interface HTMLTableElement extends HTMLElement {
-    /**
-     * Sets or retrieves a value that indicates the table alignment.
-     */
-    /** @deprecated */
-    align: string;
-    /** @deprecated */
-    bgColor: string;
-    /**
-     * Sets or retrieves the width of the border to draw around the object.
-     */
-    /** @deprecated */
-    border: string;
-    /**
-     * Retrieves the caption object of a table.
-     */
-    caption: HTMLTableCaptionElement | null;
-    /**
-     * Sets or retrieves the amount of space between the border of the cell and the content of the cell.
-     */
-    /** @deprecated */
-    cellPadding: string;
-    /**
-     * Sets or retrieves the amount of space between cells in a table.
-     */
-    /** @deprecated */
-    cellSpacing: string;
-    /**
-     * Sets or retrieves the way the border frame around the table is displayed.
-     */
-    /** @deprecated */
-    frame: string;
-    /**
-     * Sets or retrieves the number of horizontal rows contained in the object.
-     */
-    readonly rows: HTMLCollectionOf<HTMLTableRowElement>;
-    /**
-     * Sets or retrieves which dividing lines (inner borders) are displayed.
-     */
-    /** @deprecated */
-    rules: string;
-    /**
-     * Sets or retrieves a description and/or structure of the object.
-     */
-    /** @deprecated */
-    summary: string;
-    /**
-     * Retrieves a collection of all tBody objects in the table. Objects in this collection are in source order.
-     */
-    readonly tBodies: HTMLCollectionOf<HTMLTableSectionElement>;
-    /**
-     * Retrieves the tFoot object of the table.
-     */
-    tFoot: HTMLTableSectionElement | null;
-    /**
-     * Retrieves the tHead object of the table.
-     */
-    tHead: HTMLTableSectionElement | null;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    /** @deprecated */
-    width: string;
-    /**
-     * Creates an empty caption element in the table.
-     */
-    createCaption(): HTMLTableCaptionElement;
-    /**
-     * Creates an empty tBody element in the table.
-     */
-    createTBody(): HTMLTableSectionElement;
-    /**
-     * Creates an empty tFoot element in the table.
-     */
-    createTFoot(): HTMLTableSectionElement;
-    /**
-     * Returns the tHead element object if successful, or null otherwise.
-     */
-    createTHead(): HTMLTableSectionElement;
-    /**
-     * Deletes the caption element and its contents from the table.
-     */
-    deleteCaption(): void;
-    /**
-     * Removes the specified row (tr) from the element and from the rows collection.
-     * @param index Number that specifies the zero-based position in the rows collection of the row to remove.
-     */
-    deleteRow(index?: number): void;
-    /**
-     * Deletes the tFoot element and its contents from the table.
-     */
-    deleteTFoot(): void;
-    /**
-     * Deletes the tHead element and its contents from the table.
-     */
-    deleteTHead(): void;
-    /**
-     * Creates a new row (tr) in the table, and adds the row to the rows collection.
-     * @param index Number that specifies where to insert the row in the rows collection. The default value is -1, which appends the new row to the end of the rows collection.
-     */
-    insertRow(index?: number): HTMLTableRowElement;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTableElement: {
-    prototype: HTMLTableElement;
-    new(): HTMLTableElement;
-};
-
-interface HTMLTableHeaderCellElement extends HTMLTableCellElement {
-    scope: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableHeaderCellElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableHeaderCellElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTableHeaderCellElement: {
-    prototype: HTMLTableHeaderCellElement;
-    new(): HTMLTableHeaderCellElement;
-};
-
-interface HTMLTableRowElement extends HTMLElement {
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    /** @deprecated */
-    align: string;
-    /** @deprecated */
-    bgColor: string;
-    /**
-     * Retrieves a collection of all cells in the table row.
-     */
-    readonly cells: HTMLCollectionOf<HTMLTableDataCellElement | HTMLTableHeaderCellElement>;
-    /** @deprecated */
-    ch: string;
-    /** @deprecated */
-    chOff: string;
-    /**
-     * Retrieves the position of the object in the rows collection for the table.
-     */
-    readonly rowIndex: number;
-    /**
-     * Retrieves the position of the object in the collection.
-     */
-    readonly sectionRowIndex: number;
-    /** @deprecated */
-    vAlign: string;
-    /**
-     * Removes the specified cell from the table row, as well as from the cells collection.
-     * @param index Number that specifies the zero-based position of the cell to remove from the table row. If no value is provided, the last cell in the cells collection is deleted.
-     */
-    deleteCell(index?: number): void;
-    /**
-     * Creates a new cell in the table row, and adds the cell to the cells collection.
-     * @param index Number that specifies where to insert the cell in the tr. The default value is -1, which appends the new cell to the end of the cells collection.
-     */
-    insertCell(index?: number): HTMLTableDataCellElement;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableRowElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableRowElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTableRowElement: {
-    prototype: HTMLTableRowElement;
-    new(): HTMLTableRowElement;
-};
-
-interface HTMLTableSectionElement extends HTMLElement {
-    /**
-     * Sets or retrieves a value that indicates the table alignment.
-     */
-    /** @deprecated */
-    align: string;
-    /** @deprecated */
-    ch: string;
-    /** @deprecated */
-    chOff: string;
-    /**
-     * Sets or retrieves the number of horizontal rows contained in the object.
-     */
-    readonly rows: HTMLCollectionOf<HTMLTableRowElement>;
-    /** @deprecated */
-    vAlign: string;
-    /**
-     * Removes the specified row (tr) from the element and from the rows collection.
-     * @param index Number that specifies the zero-based position in the rows collection of the row to remove.
-     */
-    deleteRow(index?: number): void;
-    /**
-     * Creates a new row (tr) in the table, and adds the row to the rows collection.
-     * @param index Number that specifies where to insert the row in the rows collection. The default value is -1, which appends the new row to the end of the rows collection.
-     */
-    insertRow(index?: number): HTMLTableRowElement;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableSectionElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableSectionElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTableSectionElement: {
-    prototype: HTMLTableSectionElement;
-    new(): HTMLTableSectionElement;
-};
-
-interface HTMLTemplateElement extends HTMLElement {
-    readonly content: DocumentFragment;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTemplateElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTemplateElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTemplateElement: {
-    prototype: HTMLTemplateElement;
-    new(): HTMLTemplateElement;
-};
-
-interface HTMLTextAreaElement extends HTMLElement {
-    /**
-     * Provides a way to direct a user to a specific field when a document loads. This can provide both direction and convenience for a user, reducing the need to click or tab to a field when a page opens. This attribute is true when present on an element, and false when missing.
-     */
-    autofocus: boolean;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    cols: number;
-    /**
-     * Sets or retrieves the initial contents of the object.
-     */
-    defaultValue: string;
-    disabled: boolean;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Sets or retrieves the maximum number of characters that the user can enter in a text control.
-     */
-    maxLength: number;
-    minLength: number;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    name: string;
-    /**
-     * Gets or sets a text string that is displayed in an input field as a hint or prompt to users as the format or type of information they need to enter.The text appears in an input field until the user puts focus on the field.
-     */
-    placeholder: string;
-    /**
-     * Sets or retrieves the value indicated whether the content of the object is read-only.
-     */
-    readOnly: boolean;
-    /**
-     * When present, marks an element that can't be submitted without a value.
-     */
-    required: boolean;
-    /**
-     * Sets or retrieves the number of horizontal rows contained in the object.
-     */
-    rows: number;
-    /**
-     * Gets or sets the end position or offset of a text selection.
-     */
-    selectionEnd: number;
-    /**
-     * Gets or sets the starting position or offset of a text selection.
-     */
-    selectionStart: number;
-    /**
-     * Retrieves the type of control.
-     */
-    readonly type: string;
-    /**
-     * Returns the error message that would be displayed if the user submits the form, or an empty string if no error message. It also triggers the standard error message, such as "this is a required field". The result is that the user sees validation messages without actually submitting.
-     */
-    readonly validationMessage: string;
-    /**
-     * Returns a  ValidityState object that represents the validity states of an element.
-     */
-    readonly validity: ValidityState;
-    /**
-     * Retrieves or sets the text in the entry field of the textArea element.
-     */
-    value: string;
-    /**
-     * Returns whether an element will successfully validate based on forms validation rules and constraints.
-     */
-    readonly willValidate: boolean;
-    /**
-     * Sets or retrieves how to handle wordwrapping in the object.
-     */
-    wrap: string;
-    /**
-     * Returns whether a form will validate when it is submitted, without having to submit it.
-     */
-    checkValidity(): boolean;
-    /**
-     * Highlights the input area of a form element.
-     */
-    select(): void;
-    /**
-     * Sets a custom error message that is displayed when a form is submitted.
-     * @param error Sets a custom error message that is displayed when a form is submitted.
-     */
-    setCustomValidity(error: string): void;
-    /**
-     * Sets the start and end positions of a selection in a text field.
-     * @param start The offset into the text field for the start of the selection.
-     * @param end The offset into the text field for the end of the selection.
-     * @param direction The direction in which the selection is performed.
-     */
-    setSelectionRange(start: number, end: number, direction?: "forward" | "backward" | "none"): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTextAreaElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTextAreaElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTextAreaElement: {
-    prototype: HTMLTextAreaElement;
-    new(): HTMLTextAreaElement;
-};
-
-interface HTMLTimeElement extends HTMLElement {
-    dateTime: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTimeElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTimeElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTimeElement: {
-    prototype: HTMLTimeElement;
-    new(): HTMLTimeElement;
-};
-
-interface HTMLTitleElement extends HTMLElement {
-    /**
-     * Retrieves or sets the text of the object as a string.
-     */
-    text: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTitleElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTitleElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTitleElement: {
-    prototype: HTMLTitleElement;
-    new(): HTMLTitleElement;
-};
-
-interface HTMLTrackElement extends HTMLElement {
-    default: boolean;
-    kind: string;
-    label: string;
-    readonly readyState: number;
-    src: string;
-    srclang: string;
-    readonly track: TextTrack;
-    readonly ERROR: number;
-    readonly LOADED: number;
-    readonly LOADING: number;
-    readonly NONE: number;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTrackElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTrackElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTrackElement: {
-    prototype: HTMLTrackElement;
-    new(): HTMLTrackElement;
-    readonly ERROR: number;
-    readonly LOADED: number;
-    readonly LOADING: number;
-    readonly NONE: number;
-};
-
-interface HTMLUListElement extends HTMLElement {
-    /** @deprecated */
-    compact: boolean;
-    /** @deprecated */
-    type: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLUListElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLUListElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLUListElement: {
-    prototype: HTMLUListElement;
-    new(): HTMLUListElement;
-};
-
-interface HTMLUnknownElement extends HTMLElement {
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLUnknownElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLUnknownElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLUnknownElement: {
-    prototype: HTMLUnknownElement;
-    new(): HTMLUnknownElement;
-};
-
-interface HTMLVideoElementEventMap extends HTMLMediaElementEventMap {
-    "MSVideoFormatChanged": Event;
-    "MSVideoFrameStepCompleted": Event;
-    "MSVideoOptimalLayoutChanged": Event;
-}
-
-interface HTMLVideoElement extends HTMLMediaElement {
-    /**
-     * Gets or sets the height of the video element.
-     */
-    height: number;
-    msHorizontalMirror: boolean;
-    readonly msIsLayoutOptimalForPlayback: boolean;
-    readonly msIsStereo3D: boolean;
-    msStereo3DPackingMode: string;
-    msStereo3DRenderMode: string;
-    msZoom: boolean;
-    onMSVideoFormatChanged: ((this: HTMLVideoElement, ev: Event) => any) | null;
-    onMSVideoFrameStepCompleted: ((this: HTMLVideoElement, ev: Event) => any) | null;
-    onMSVideoOptimalLayoutChanged: ((this: HTMLVideoElement, ev: Event) => any) | null;
-    /**
-     * Gets or sets a URL of an image to display, for example, like a movie poster. This can be a still frame from the video, or another image if no video data is available.
-     */
-    poster: string;
-    /**
-     * Gets the intrinsic height of a video in CSS pixels, or zero if the dimensions are not known.
-     */
-    readonly videoHeight: number;
-    /**
-     * Gets the intrinsic width of a video in CSS pixels, or zero if the dimensions are not known.
-     */
-    readonly videoWidth: number;
-    readonly webkitDisplayingFullscreen: boolean;
-    readonly webkitSupportsFullscreen: boolean;
-    /**
-     * Gets or sets the width of the video element.
-     */
-    width: number;
-    getVideoPlaybackQuality(): VideoPlaybackQuality;
-    msFrameStep(forward: boolean): void;
-    msInsertVideoEffect(activatableClassId: string, effectRequired: boolean, config?: any): void;
-    msSetVideoRectangle(left: number, top: number, right: number, bottom: number): void;
-    webkitEnterFullScreen(): void;
-    webkitEnterFullscreen(): void;
-    webkitExitFullScreen(): void;
-    webkitExitFullscreen(): void;
-    addEventListener<K extends keyof HTMLVideoElementEventMap>(type: K, listener: (this: HTMLVideoElement, ev: HTMLVideoElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLVideoElementEventMap>(type: K, listener: (this: HTMLVideoElement, ev: HTMLVideoElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLVideoElement: {
-    prototype: HTMLVideoElement;
-    new(): HTMLVideoElement;
-};
-
-interface HTMLegendElement {
-    readonly form: HTMLFormElement | null;
-}
-
-declare var HTMLegendElement: {
-    prototype: HTMLegendElement;
-    new(): HTMLegendElement;
-};
-
-interface HashChangeEvent extends Event {
-    readonly newURL: string;
-    readonly oldURL: string;
-}
-
-declare var HashChangeEvent: {
-    prototype: HashChangeEvent;
-    new(type: string, eventInitDict?: HashChangeEventInit): HashChangeEvent;
-};
-
-interface Headers {
-    append(name: string, value: string): void;
-    delete(name: string): void;
-    forEach(callback: Function, thisArg?: any): void;
-    get(name: string): string | null;
-    has(name: string): boolean;
-    set(name: string, value: string): void;
-}
-
-declare var Headers: {
-    prototype: Headers;
-    new(init?: HeadersInit): Headers;
-};
-
-interface History {
-    readonly length: number;
-    scrollRestoration: ScrollRestoration;
-    readonly state: any;
-    back(distance?: any): void;
-    forward(distance?: any): void;
-    go(delta?: any): void;
-    pushState(data: any, title?: string, url?: string | null): void;
-    replaceState(data: any, title?: string, url?: string | null): void;
-}
-
-declare var History: {
-    prototype: History;
-    new(): History;
-};
-
-interface HkdfCtrParams extends Algorithm {
-    context: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer;
-    hash: string | Algorithm;
-    label: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer;
-}
-
-interface IDBArrayKey extends Array<number | string | Date | IDBArrayKey> {
-}
-
-interface IDBCursor {
-    readonly direction: IDBCursorDirection;
-    readonly key: IDBKeyRange | number | string | Date | IDBArrayKey;
-    readonly primaryKey: any;
-    readonly source: IDBObjectStore | IDBIndex;
-    advance(count: number): void;
-    continue(key?: IDBKeyRange | number | string | Date | IDBArrayKey): void;
-    delete(): IDBRequest;
-    update(value: any): IDBRequest;
-    readonly NEXT: string;
-    readonly NEXT_NO_DUPLICATE: string;
-    readonly PREV: string;
-    readonly PREV_NO_DUPLICATE: string;
-}
-
-declare var IDBCursor: {
-    prototype: IDBCursor;
-    new(): IDBCursor;
-    readonly NEXT: string;
-    readonly NEXT_NO_DUPLICATE: string;
-    readonly PREV: string;
-    readonly PREV_NO_DUPLICATE: string;
-};
-
-interface IDBCursorWithValue extends IDBCursor {
-    readonly value: any;
-}
-
-declare var IDBCursorWithValue: {
-    prototype: IDBCursorWithValue;
-    new(): IDBCursorWithValue;
-};
-
-interface IDBDatabaseEventMap {
-    "abort": Event;
-    "error": Event;
-}
-
-interface IDBDatabase extends EventTarget {
-    readonly name: string;
-    readonly objectStoreNames: DOMStringList;
-    onabort: ((this: IDBDatabase, ev: Event) => any) | null;
-    onerror: ((this: IDBDatabase, ev: Event) => any) | null;
-    onversionchange: ((this: IDBDatabase, ev: Event) => any) | null;
-    readonly version: number;
-    close(): void;
-    createObjectStore(name: string, optionalParameters?: IDBObjectStoreParameters): IDBObjectStore;
-    deleteObjectStore(name: string): void;
-    transaction(storeNames: string | string[], mode?: IDBTransactionMode): IDBTransaction;
-    addEventListener<K extends keyof IDBDatabaseEventMap>(type: K, listener: (this: IDBDatabase, ev: IDBDatabaseEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof IDBDatabaseEventMap>(type: K, listener: (this: IDBDatabase, ev: IDBDatabaseEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var IDBDatabase: {
-    prototype: IDBDatabase;
-    new(): IDBDatabase;
-};
-
-interface IDBEnvironment {
-    readonly indexedDB: IDBFactory;
-}
-
-interface IDBFactory {
-    cmp(first: any, second: any): number;
-    deleteDatabase(name: string): IDBOpenDBRequest;
-    open(name: string, version?: number): IDBOpenDBRequest;
-}
-
-declare var IDBFactory: {
-    prototype: IDBFactory;
-    new(): IDBFactory;
-};
-
-interface IDBIndex {
-    readonly keyPath: string | string[];
-    multiEntry: boolean;
-    readonly name: string;
-    readonly objectStore: IDBObjectStore;
-    readonly unique: boolean;
-    count(key?: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-    get(key: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-    getKey(key: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-    openCursor(range?: IDBKeyRange | number | string | Date | IDBArrayKey, direction?: IDBCursorDirection): IDBRequest;
-    openKeyCursor(range?: IDBKeyRange | number | string | Date | IDBArrayKey, direction?: IDBCursorDirection): IDBRequest;
-}
-
-declare var IDBIndex: {
-    prototype: IDBIndex;
-    new(): IDBIndex;
-};
-
-interface IDBKeyRange {
-    readonly lower: any;
-    readonly lowerOpen: boolean;
-    readonly upper: any;
-    readonly upperOpen: boolean;
-}
-
-declare var IDBKeyRange: {
-    prototype: IDBKeyRange;
-    new(): IDBKeyRange;
-    bound(lower: any, upper: any, lowerOpen?: boolean, upperOpen?: boolean): IDBKeyRange;
-    lowerBound(lower: any, open?: boolean): IDBKeyRange;
-    only(value: any): IDBKeyRange;
-    upperBound(upper: any, open?: boolean): IDBKeyRange;
-};
-
-interface IDBObjectStore {
-    autoIncrement: boolean;
-    readonly indexNames: DOMStringList;
-    readonly keyPath: string | string[] | null;
-    readonly name: string;
-    readonly transaction: IDBTransaction;
-    add(value: any, key?: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-    clear(): IDBRequest;
-    count(key?: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-    createIndex(name: string, keyPath: string | string[], optionalParameters?: IDBIndexParameters): IDBIndex;
-    delete(key: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-    deleteIndex(indexName: string): void;
-    get(key: any): IDBRequest;
-    index(name: string): IDBIndex;
-    openCursor(range?: IDBKeyRange | number | string | Date | IDBArrayKey, direction?: IDBCursorDirection): IDBRequest;
-    put(value: any, key?: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-}
-
-declare var IDBObjectStore: {
-    prototype: IDBObjectStore;
-    new(): IDBObjectStore;
-};
-
-interface IDBOpenDBRequestEventMap extends IDBRequestEventMap {
-    "blocked": Event;
-    "upgradeneeded": IDBVersionChangeEvent;
-}
-
-interface IDBOpenDBRequest extends IDBRequest {
-    onblocked: ((this: IDBOpenDBRequest, ev: Event) => any) | null;
-    onupgradeneeded: ((this: IDBOpenDBRequest, ev: IDBVersionChangeEvent) => any) | null;
-    addEventListener<K extends keyof IDBOpenDBRequestEventMap>(type: K, listener: (this: IDBOpenDBRequest, ev: IDBOpenDBRequestEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof IDBOpenDBRequestEventMap>(type: K, listener: (this: IDBOpenDBRequest, ev: IDBOpenDBRequestEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var IDBOpenDBRequest: {
-    prototype: IDBOpenDBRequest;
-    new(): IDBOpenDBRequest;
-};
-
-interface IDBRequestEventMap {
-    "error": Event;
-    "success": Event;
-}
-
-interface IDBRequest extends EventTarget {
-    readonly error: DOMException;
-    onerror: ((this: IDBRequest, ev: Event) => any) | null;
-    onsuccess: ((this: IDBRequest, ev: Event) => any) | null;
-    readonly readyState: IDBRequestReadyState;
-    readonly result: any;
-    readonly source: IDBObjectStore | IDBIndex | IDBCursor;
-    readonly transaction: IDBTransaction;
-    addEventListener<K extends keyof IDBRequestEventMap>(type: K, listener: (this: IDBRequest, ev: IDBRequestEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof IDBRequestEventMap>(type: K, listener: (this: IDBRequest, ev: IDBRequestEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var IDBRequest: {
-    prototype: IDBRequest;
-    new(): IDBRequest;
-};
-
-interface IDBTransactionEventMap {
-    "abort": Event;
-    "complete": Event;
-    "error": Event;
-}
-
-interface IDBTransaction extends EventTarget {
-    readonly db: IDBDatabase;
-    readonly error: DOMException;
-    readonly mode: IDBTransactionMode;
-    onabort: ((this: IDBTransaction, ev: Event) => any) | null;
-    oncomplete: ((this: IDBTransaction, ev: Event) => any) | null;
-    onerror: ((this: IDBTransaction, ev: Event) => any) | null;
-    abort(): void;
-    objectStore(name: string): IDBObjectStore;
-    readonly READ_ONLY: string;
-    readonly READ_WRITE: string;
-    readonly VERSION_CHANGE: string;
-    addEventListener<K extends keyof IDBTransactionEventMap>(type: K, listener: (this: IDBTransaction, ev: IDBTransactionEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof IDBTransactionEventMap>(type: K, listener: (this: IDBTransaction, ev: IDBTransactionEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var IDBTransaction: {
-    prototype: IDBTransaction;
-    new(): IDBTransaction;
-    readonly READ_ONLY: string;
-    readonly READ_WRITE: string;
-    readonly VERSION_CHANGE: string;
-};
-
-interface IDBVersionChangeEvent extends Event {
-    readonly newVersion: number | null;
-    readonly oldVersion: number;
-}
-
-declare var IDBVersionChangeEvent: {
-    prototype: IDBVersionChangeEvent;
-    new(): IDBVersionChangeEvent;
-};
-
-interface IIRFilterNode extends AudioNode {
-    getFrequencyResponse(frequencyHz: Float32Array, magResponse: Float32Array, phaseResponse: Float32Array): void;
-}
-
-declare var IIRFilterNode: {
-    prototype: IIRFilterNode;
-    new(): IIRFilterNode;
-};
-
-interface ImageBitmap {
-    readonly height: number;
-    readonly width: number;
-    close(): void;
-}
-
-interface ImageBitmapOptions {
-    colorSpaceConversion?: "none" | "default";
-    imageOrientation?: "none" | "flipY";
-    premultiplyAlpha?: "none" | "premultiply" | "default";
-    resizeHeight?: number;
-    resizeQuality?: "pixelated" | "low" | "medium" | "high";
-    resizeWidth?: number;
-}
-
-interface ImageData {
-    readonly data: Uint8ClampedArray;
-    readonly height: number;
-    readonly width: number;
-}
-
-declare var ImageData: {
-    prototype: ImageData;
-    new(width: number, height: number): ImageData;
-    new(array: Uint8ClampedArray, width: number, height: number): ImageData;
-};
-
-interface IntersectionObserver {
-    readonly root: Element | null;
-    readonly rootMargin: string;
-    readonly thresholds: number[];
-    disconnect(): void;
-    observe(target: Element): void;
-    takeRecords(): IntersectionObserverEntry[];
-    unobserve(target: Element): void;
-}
-
-declare var IntersectionObserver: {
-    prototype: IntersectionObserver;
-    new(callback: IntersectionObserverCallback, options?: IntersectionObserverInit): IntersectionObserver;
-};
-
-interface IntersectionObserverEntry {
-    readonly boundingClientRect: ClientRect | DOMRect;
-    readonly intersectionRatio: number;
-    readonly intersectionRect: ClientRect | DOMRect;
-    readonly isIntersecting: boolean;
-    readonly rootBounds: ClientRect | DOMRect;
-    readonly target: Element;
-    readonly time: number;
-}
-
-declare var IntersectionObserverEntry: {
-    prototype: IntersectionObserverEntry;
-    new(intersectionObserverEntryInit: IntersectionObserverEntryInit): IntersectionObserverEntry;
-};
-
-interface KeyboardEvent extends UIEvent {
-    readonly altKey: boolean;
-    /** @deprecated */
-    char: string;
-    /** @deprecated */
-    readonly charCode: number;
-    readonly code: string;
-    readonly ctrlKey: boolean;
-    readonly key: string;
-    /** @deprecated */
-    readonly keyCode: number;
-    readonly location: number;
-    readonly metaKey: boolean;
-    readonly repeat: boolean;
-    readonly shiftKey: boolean;
-    /** @deprecated */
-    readonly which: number;
-    getModifierState(keyArg: string): boolean;
-    /** @deprecated */
-    initKeyboardEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, keyArg: string, locationArg: number, modifiersListArg: string, repeat: boolean, locale: string): void;
-    readonly DOM_KEY_LOCATION_JOYSTICK: number;
-    readonly DOM_KEY_LOCATION_LEFT: number;
-    readonly DOM_KEY_LOCATION_MOBILE: number;
-    readonly DOM_KEY_LOCATION_NUMPAD: number;
-    readonly DOM_KEY_LOCATION_RIGHT: number;
-    readonly DOM_KEY_LOCATION_STANDARD: number;
-}
-
-declare var KeyboardEvent: {
-    prototype: KeyboardEvent;
-    new(typeArg: string, eventInitDict?: KeyboardEventInit): KeyboardEvent;
-    readonly DOM_KEY_LOCATION_JOYSTICK: number;
-    readonly DOM_KEY_LOCATION_LEFT: number;
-    readonly DOM_KEY_LOCATION_MOBILE: number;
-    readonly DOM_KEY_LOCATION_NUMPAD: number;
-    readonly DOM_KEY_LOCATION_RIGHT: number;
-    readonly DOM_KEY_LOCATION_STANDARD: number;
-};
-
-interface LinkStyle {
-    readonly sheet: StyleSheet | null;
-}
-
-interface ListeningStateChangedEvent extends Event {
-    readonly label: string;
-    readonly state: ListeningState;
-}
-
-declare var ListeningStateChangedEvent: {
-    prototype: ListeningStateChangedEvent;
-    new(): ListeningStateChangedEvent;
-};
-
-interface Location {
-    hash: string;
-    host: string;
-    hostname: string;
-    href: string;
-    readonly origin: string;
-    pathname: string;
-    port: string;
-    protocol: string;
-    search: string;
-    assign(url: string): void;
-    reload(forcedReload?: boolean): void;
-    replace(url: string): void;
-    toString(): string;
-}
-
-declare var Location: {
-    prototype: Location;
-    new(): Location;
-};
-
-interface MSAssertion {
-    readonly id: string;
-    readonly type: MSCredentialType;
-}
-
-declare var MSAssertion: {
-    prototype: MSAssertion;
-    new(): MSAssertion;
-};
-
-interface MSBlobBuilder {
-    append(data: any, endings?: string): void;
-    getBlob(contentType?: string): Blob;
-}
-
-declare var MSBlobBuilder: {
-    prototype: MSBlobBuilder;
-    new(): MSBlobBuilder;
-};
-
-interface MSCredentials {
-    getAssertion(challenge: string, filter?: MSCredentialFilter, params?: MSSignatureParameters): Promise<MSAssertion>;
-    makeCredential(accountInfo: MSAccountInfo, params: MSCredentialParameters[], challenge?: string): Promise<MSAssertion>;
-}
-
-declare var MSCredentials: {
-    prototype: MSCredentials;
-    new(): MSCredentials;
-};
-
-interface MSDCCEvent extends Event {
-    readonly maxFr: number;
-    readonly maxFs: number;
-}
-
-declare var MSDCCEvent: {
-    prototype: MSDCCEvent;
-    new(type: string, eventInitDict: MSDCCEventInit): MSDCCEvent;
-};
-
-interface MSDSHEvent extends Event {
-    readonly sources: number[];
-    readonly timestamp: number;
-}
-
-declare var MSDSHEvent: {
-    prototype: MSDSHEvent;
-    new(type: string, eventInitDict: MSDSHEventInit): MSDSHEvent;
-};
-
-interface MSFIDOCredentialAssertion extends MSAssertion {
-    readonly algorithm: string | Algorithm;
-    readonly attestation: any;
-    readonly publicKey: string;
-    readonly transportHints: MSTransportType[];
-}
-
-declare var MSFIDOCredentialAssertion: {
-    prototype: MSFIDOCredentialAssertion;
-    new(): MSFIDOCredentialAssertion;
-};
-
-interface MSFIDOSignature {
-    readonly authnrData: string;
-    readonly clientData: string;
-    readonly signature: string;
-}
-
-declare var MSFIDOSignature: {
-    prototype: MSFIDOSignature;
-    new(): MSFIDOSignature;
-};
-
-interface MSFIDOSignatureAssertion extends MSAssertion {
-    readonly signature: MSFIDOSignature;
-}
-
-declare var MSFIDOSignatureAssertion: {
-    prototype: MSFIDOSignatureAssertion;
-    new(): MSFIDOSignatureAssertion;
-};
-
-interface MSFileSaver {
-    msSaveBlob(blob: any, defaultName?: string): boolean;
-    msSaveOrOpenBlob(blob: any, defaultName?: string): boolean;
-}
-
-interface MSGesture {
-    target: Element;
-    addPointer(pointerId: number): void;
-    stop(): void;
-}
-
-declare var MSGesture: {
-    prototype: MSGesture;
-    new(): MSGesture;
-};
-
-interface MSGestureEvent extends UIEvent {
-    readonly clientX: number;
-    readonly clientY: number;
-    readonly expansion: number;
-    readonly gestureObject: any;
-    readonly hwTimestamp: number;
-    readonly offsetX: number;
-    readonly offsetY: number;
-    readonly rotation: number;
-    readonly scale: number;
-    readonly screenX: number;
-    readonly screenY: number;
-    readonly translationX: number;
-    readonly translationY: number;
-    readonly velocityAngular: number;
-    readonly velocityExpansion: number;
-    readonly velocityX: number;
-    readonly velocityY: number;
-    initGestureEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number, screenXArg: number, screenYArg: number, clientXArg: number, clientYArg: number, offsetXArg: number, offsetYArg: number, translationXArg: number, translationYArg: number, scaleArg: number, expansionArg: number, rotationArg: number, velocityXArg: number, velocityYArg: number, velocityExpansionArg: number, velocityAngularArg: number, hwTimestampArg: number): void;
-    readonly MSGESTURE_FLAG_BEGIN: number;
-    readonly MSGESTURE_FLAG_CANCEL: number;
-    readonly MSGESTURE_FLAG_END: number;
-    readonly MSGESTURE_FLAG_INERTIA: number;
-    readonly MSGESTURE_FLAG_NONE: number;
-}
-
-declare var MSGestureEvent: {
-    prototype: MSGestureEvent;
-    new(): MSGestureEvent;
-    readonly MSGESTURE_FLAG_BEGIN: number;
-    readonly MSGESTURE_FLAG_CANCEL: number;
-    readonly MSGESTURE_FLAG_END: number;
-    readonly MSGESTURE_FLAG_INERTIA: number;
-    readonly MSGESTURE_FLAG_NONE: number;
-};
-
-interface MSGraphicsTrust {
-    readonly constrictionActive: boolean;
-    readonly status: string;
-}
-
-declare var MSGraphicsTrust: {
-    prototype: MSGraphicsTrust;
-    new(): MSGraphicsTrust;
-};
-
-interface MSInputMethodContextEventMap {
-    "MSCandidateWindowHide": Event;
-    "MSCandidateWindowShow": Event;
-    "MSCandidateWindowUpdate": Event;
-}
-
-interface MSInputMethodContext extends EventTarget {
-    readonly compositionEndOffset: number;
-    readonly compositionStartOffset: number;
-    oncandidatewindowhide: ((this: MSInputMethodContext, ev: Event) => any) | null;
-    oncandidatewindowshow: ((this: MSInputMethodContext, ev: Event) => any) | null;
-    oncandidatewindowupdate: ((this: MSInputMethodContext, ev: Event) => any) | null;
-    readonly target: HTMLElement;
-    getCandidateWindowClientRect(): ClientRect;
-    getCompositionAlternatives(): string[];
-    hasComposition(): boolean;
-    isCandidateWindowVisible(): boolean;
-    addEventListener<K extends keyof MSInputMethodContextEventMap>(type: K, listener: (this: MSInputMethodContext, ev: MSInputMethodContextEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof MSInputMethodContextEventMap>(type: K, listener: (this: MSInputMethodContext, ev: MSInputMethodContextEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var MSInputMethodContext: {
-    prototype: MSInputMethodContext;
-    new(): MSInputMethodContext;
-};
-
-interface MSMediaKeyError {
-    readonly code: number;
-    readonly systemCode: number;
-    readonly MS_MEDIA_KEYERR_CLIENT: number;
-    readonly MS_MEDIA_KEYERR_DOMAIN: number;
-    readonly MS_MEDIA_KEYERR_HARDWARECHANGE: number;
-    readonly MS_MEDIA_KEYERR_OUTPUT: number;
-    readonly MS_MEDIA_KEYERR_SERVICE: number;
-    readonly MS_MEDIA_KEYERR_UNKNOWN: number;
-}
-
-declare var MSMediaKeyError: {
-    prototype: MSMediaKeyError;
-    new(): MSMediaKeyError;
-    readonly MS_MEDIA_KEYERR_CLIENT: number;
-    readonly MS_MEDIA_KEYERR_DOMAIN: number;
-    readonly MS_MEDIA_KEYERR_HARDWARECHANGE: number;
-    readonly MS_MEDIA_KEYERR_OUTPUT: number;
-    readonly MS_MEDIA_KEYERR_SERVICE: number;
-    readonly MS_MEDIA_KEYERR_UNKNOWN: number;
-};
-
-interface MSMediaKeyMessageEvent extends Event {
-    readonly destinationURL: string | null;
-    readonly message: Uint8Array;
-}
-
-declare var MSMediaKeyMessageEvent: {
-    prototype: MSMediaKeyMessageEvent;
-    new(): MSMediaKeyMessageEvent;
-};
-
-interface MSMediaKeyNeededEvent extends Event {
-    readonly initData: Uint8Array | null;
-}
-
-declare var MSMediaKeyNeededEvent: {
-    prototype: MSMediaKeyNeededEvent;
-    new(): MSMediaKeyNeededEvent;
-};
-
-interface MSMediaKeySession extends EventTarget {
-    readonly error: MSMediaKeyError | null;
-    readonly keySystem: string;
-    readonly sessionId: string;
-    close(): void;
-    update(key: Uint8Array): void;
-}
-
-declare var MSMediaKeySession: {
-    prototype: MSMediaKeySession;
-    new(): MSMediaKeySession;
-};
-
-interface MSMediaKeys {
-    readonly keySystem: string;
-    createSession(type: string, initData: Uint8Array, cdmData?: Uint8Array | null): MSMediaKeySession;
-}
-
-declare var MSMediaKeys: {
-    prototype: MSMediaKeys;
-    new(keySystem: string): MSMediaKeys;
-    isTypeSupported(keySystem: string, type?: string | null): boolean;
-    isTypeSupportedWithFeatures(keySystem: string, type?: string | null): string;
-};
-
-interface MSNavigatorDoNotTrack {
-    confirmSiteSpecificTrackingException(args: ConfirmSiteSpecificExceptionsInformation): boolean;
-    confirmWebWideTrackingException(args: ExceptionInformation): boolean;
-    removeSiteSpecificTrackingException(args: ExceptionInformation): void;
-    removeWebWideTrackingException(args: ExceptionInformation): void;
-    storeSiteSpecificTrackingException(args: StoreSiteSpecificExceptionsInformation): void;
-    storeWebWideTrackingException(args: StoreExceptionsInformation): void;
-}
-
-interface MSPointerEvent extends MouseEvent {
-    readonly currentPoint: any;
-    readonly height: number;
-    readonly hwTimestamp: number;
-    readonly intermediatePoints: any;
-    readonly isPrimary: boolean;
-    readonly pointerId: number;
-    readonly pointerType: any;
-    readonly pressure: number;
-    readonly rotation: number;
-    readonly tiltX: number;
-    readonly tiltY: number;
-    readonly width: number;
-    getCurrentPoint(element: Element): void;
-    getIntermediatePoints(element: Element): void;
-    initPointerEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number, screenXArg: number, screenYArg: number, clientXArg: number, clientYArg: number, ctrlKeyArg: boolean, altKeyArg: boolean, shiftKeyArg: boolean, metaKeyArg: boolean, buttonArg: number, relatedTargetArg: EventTarget, offsetXArg: number, offsetYArg: number, widthArg: number, heightArg: number, pressure: number, rotation: number, tiltX: number, tiltY: number, pointerIdArg: number, pointerType: any, hwTimestampArg: number, isPrimary: boolean): void;
-}
-
-declare var MSPointerEvent: {
-    prototype: MSPointerEvent;
-    new(typeArg: string, eventInitDict?: PointerEventInit): MSPointerEvent;
-};
-
-interface MSStream {
-    readonly type: string;
-    msClose(): void;
-    msDetachStream(): any;
-}
-
-declare var MSStream: {
-    prototype: MSStream;
-    new(): MSStream;
-};
-
-interface MSStreamReaderEventMap {
-    "abort": UIEvent;
-    "error": ErrorEvent;
-    "load": Event;
-    "loadend": ProgressEvent;
-    "loadstart": Event;
-    "progress": ProgressEvent;
-}
-
-interface MSStreamReader extends EventTarget {
-    readonly error: DOMError;
-    onabort: ((this: MSStreamReader, ev: UIEvent) => any) | null;
-    onerror: ((this: MSStreamReader, ev: ErrorEvent) => any) | null;
-    onload: ((this: MSStreamReader, ev: Event) => any) | null;
-    onloadend: ((this: MSStreamReader, ev: ProgressEvent) => any) | null;
-    onloadstart: ((this: MSStreamReader, ev: Event) => any) | null;
-    onprogress: ((this: MSStreamReader, ev: ProgressEvent) => any) | null;
-    readonly readyState: number;
-    readonly result: any;
-    abort(): void;
-    readAsArrayBuffer(stream: MSStream, size?: number): void;
-    readAsBinaryString(stream: MSStream, size?: number): void;
-    readAsBlob(stream: MSStream, size?: number): void;
-    readAsDataURL(stream: MSStream, size?: number): void;
-    readAsText(stream: MSStream, encoding?: string, size?: number): void;
-    readonly DONE: number;
-    readonly EMPTY: number;
-    readonly LOADING: number;
-    addEventListener<K extends keyof MSStreamReaderEventMap>(type: K, listener: (this: MSStreamReader, ev: MSStreamReaderEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof MSStreamReaderEventMap>(type: K, listener: (this: MSStreamReader, ev: MSStreamReaderEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var MSStreamReader: {
-    prototype: MSStreamReader;
-    new(): MSStreamReader;
-    readonly DONE: number;
-    readonly EMPTY: number;
-    readonly LOADING: number;
-};
-
-interface MediaDeviceInfo {
-    readonly deviceId: string;
-    readonly groupId: string;
-    readonly kind: MediaDeviceKind;
-    readonly label: string;
-}
-
-declare var MediaDeviceInfo: {
-    prototype: MediaDeviceInfo;
-    new(): MediaDeviceInfo;
-};
-
-interface MediaDevicesEventMap {
-    "devicechange": Event;
-}
-
-interface MediaDevices extends EventTarget {
-    ondevicechange: ((this: MediaDevices, ev: Event) => any) | null;
-    enumerateDevices(): Promise<MediaDeviceInfo[]>;
-    getSupportedConstraints(): MediaTrackSupportedConstraints;
-    getUserMedia(constraints: MediaStreamConstraints): Promise<MediaStream>;
-    addEventListener<K extends keyof MediaDevicesEventMap>(type: K, listener: (this: MediaDevices, ev: MediaDevicesEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof MediaDevicesEventMap>(type: K, listener: (this: MediaDevices, ev: MediaDevicesEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var MediaDevices: {
-    prototype: MediaDevices;
-    new(): MediaDevices;
-};
-
-interface MediaElementAudioSourceNode extends AudioNode {
-}
-
-declare var MediaElementAudioSourceNode: {
-    prototype: MediaElementAudioSourceNode;
-    new(): MediaElementAudioSourceNode;
-};
-
-interface MediaEncryptedEvent extends Event {
-    readonly initData: ArrayBuffer | null;
-    readonly initDataType: string;
-}
-
-declare var MediaEncryptedEvent: {
-    prototype: MediaEncryptedEvent;
-    new(type: string, eventInitDict?: MediaEncryptedEventInit): MediaEncryptedEvent;
-};
-
-interface MediaError {
-    readonly code: number;
-    readonly message: string;
-    readonly msExtendedCode: number;
-    readonly MEDIA_ERR_ABORTED: number;
-    readonly MEDIA_ERR_DECODE: number;
-    readonly MEDIA_ERR_NETWORK: number;
-    readonly MEDIA_ERR_SRC_NOT_SUPPORTED: number;
-    readonly MS_MEDIA_ERR_ENCRYPTED: number;
-}
-
-declare var MediaError: {
-    prototype: MediaError;
-    new(): MediaError;
-    readonly MEDIA_ERR_ABORTED: number;
-    readonly MEDIA_ERR_DECODE: number;
-    readonly MEDIA_ERR_NETWORK: number;
-    readonly MEDIA_ERR_SRC_NOT_SUPPORTED: number;
-    readonly MS_MEDIA_ERR_ENCRYPTED: number;
-};
-
-interface MediaKeyMessageEvent extends Event {
-    readonly message: ArrayBuffer;
-    readonly messageType: MediaKeyMessageType;
-}
-
-declare var MediaKeyMessageEvent: {
-    prototype: MediaKeyMessageEvent;
-    new(type: string, eventInitDict?: MediaKeyMessageEventInit): MediaKeyMessageEvent;
-};
-
-interface MediaKeySession extends EventTarget {
-    readonly closed: Promise<void>;
-    readonly expiration: number;
-    readonly keyStatuses: MediaKeyStatusMap;
-    readonly sessionId: string;
-    close(): Promise<void>;
-    generateRequest(initDataType: string, initData: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null): Promise<void>;
-    load(sessionId: string): Promise<boolean>;
-    remove(): Promise<void>;
-    update(response: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null): Promise<void>;
-}
-
-declare var MediaKeySession: {
-    prototype: MediaKeySession;
-    new(): MediaKeySession;
-};
-
-interface MediaKeyStatusMap {
-    readonly size: number;
-    forEach(callback: Function, thisArg?: any): void;
-    get(keyId: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null): MediaKeyStatus;
-    has(keyId: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null): boolean;
-}
-
-declare var MediaKeyStatusMap: {
-    prototype: MediaKeyStatusMap;
-    new(): MediaKeyStatusMap;
-};
-
-interface MediaKeySystemAccess {
-    readonly keySystem: string;
-    createMediaKeys(): Promise<MediaKeys>;
-    getConfiguration(): MediaKeySystemConfiguration;
-}
-
-declare var MediaKeySystemAccess: {
-    prototype: MediaKeySystemAccess;
-    new(): MediaKeySystemAccess;
-};
-
-interface MediaKeys {
-    createSession(sessionType?: MediaKeySessionType): MediaKeySession;
-    setServerCertificate(serverCertificate: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null): Promise<void>;
-}
-
-declare var MediaKeys: {
-    prototype: MediaKeys;
-    new(): MediaKeys;
-};
-
-interface MediaList {
-    readonly length: number;
-    mediaText: string;
-    appendMedium(medium: string): void;
-    deleteMedium(medium: string): void;
-    item(index: number): string | null;
-    toString(): number;
-    [index: number]: string;
-}
-
-declare var MediaList: {
-    prototype: MediaList;
-    new(): MediaList;
-};
-
-interface MediaQueryList {
-    readonly matches: boolean;
-    readonly media: string;
-    addListener(listener: MediaQueryListListener): void;
-    removeListener(listener: MediaQueryListListener): void;
-}
-
-declare var MediaQueryList: {
-    prototype: MediaQueryList;
-    new(): MediaQueryList;
-};
-
-interface MediaSource extends EventTarget {
-    readonly activeSourceBuffers: SourceBufferList;
-    duration: number;
-    readonly readyState: string;
-    readonly sourceBuffers: SourceBufferList;
-    addSourceBuffer(type: string): SourceBuffer;
-    endOfStream(error?: number): void;
-    removeSourceBuffer(sourceBuffer: SourceBuffer): void;
-}
-
-declare var MediaSource: {
-    prototype: MediaSource;
-    new(): MediaSource;
-    isTypeSupported(type: string): boolean;
-};
-
-interface MediaStreamEventMap {
-    "active": Event;
-    "addtrack": MediaStreamTrackEvent;
-    "inactive": Event;
-    "removetrack": MediaStreamTrackEvent;
-}
-
-interface MediaStream extends EventTarget {
-    readonly active: boolean;
-    readonly id: string;
-    onactive: ((this: MediaStream, ev: Event) => any) | null;
-    onaddtrack: ((this: MediaStream, ev: MediaStreamTrackEvent) => any) | null;
-    oninactive: ((this: MediaStream, ev: Event) => any) | null;
-    onremovetrack: ((this: MediaStream, ev: MediaStreamTrackEvent) => any) | null;
-    addTrack(track: MediaStreamTrack): void;
-    clone(): MediaStream;
-    getAudioTracks(): MediaStreamTrack[];
-    getTrackById(trackId: string): MediaStreamTrack | null;
-    getTracks(): MediaStreamTrack[];
-    getVideoTracks(): MediaStreamTrack[];
-    removeTrack(track: MediaStreamTrack): void;
-    stop(): void;
-    addEventListener<K extends keyof MediaStreamEventMap>(type: K, listener: (this: MediaStream, ev: MediaStreamEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof MediaStreamEventMap>(type: K, listener: (this: MediaStream, ev: MediaStreamEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var MediaStream: {
-    prototype: MediaStream;
-    new(): MediaStream;
-    new(stream: MediaStream): MediaStream;
-    new(tracks: MediaStreamTrack[]): MediaStream;
-};
-
-interface MediaStreamAudioSourceNode extends AudioNode {
-}
-
-declare var MediaStreamAudioSourceNode: {
-    prototype: MediaStreamAudioSourceNode;
-    new(): MediaStreamAudioSourceNode;
-};
-
-interface MediaStreamError {
-    readonly constraintName: string | null;
-    readonly message: string | null;
-    readonly name: string;
-}
-
-declare var MediaStreamError: {
-    prototype: MediaStreamError;
-    new(): MediaStreamError;
-};
-
-interface MediaStreamErrorEvent extends Event {
-    readonly error: MediaStreamError | null;
-}
-
-declare var MediaStreamErrorEvent: {
-    prototype: MediaStreamErrorEvent;
-    new(typeArg: string, eventInitDict?: MediaStreamErrorEventInit): MediaStreamErrorEvent;
-};
-
-interface MediaStreamEvent extends Event {
-    readonly stream: MediaStream | null;
-}
-
-declare var MediaStreamEvent: {
-    prototype: MediaStreamEvent;
-    new(type: string, eventInitDict: MediaStreamEventInit): MediaStreamEvent;
-};
-
-interface MediaStreamTrackEventMap {
-    "ended": MediaStreamErrorEvent;
-    "mute": Event;
-    "overconstrained": MediaStreamErrorEvent;
-    "unmute": Event;
-}
-
-interface MediaStreamTrack extends EventTarget {
-    enabled: boolean;
-    readonly id: string;
-    readonly kind: string;
-    readonly label: string;
-    readonly muted: boolean;
-    onended: ((this: MediaStreamTrack, ev: MediaStreamErrorEvent) => any) | null;
-    onmute: ((this: MediaStreamTrack, ev: Event) => any) | null;
-    onoverconstrained: ((this: MediaStreamTrack, ev: MediaStreamErrorEvent) => any) | null;
-    onunmute: ((this: MediaStreamTrack, ev: Event) => any) | null;
-    readonly readonly: boolean;
-    readonly readyState: MediaStreamTrackState;
-    readonly remote: boolean;
-    applyConstraints(constraints: MediaTrackConstraints): Promise<void>;
-    clone(): MediaStreamTrack;
-    getCapabilities(): MediaTrackCapabilities;
-    getConstraints(): MediaTrackConstraints;
-    getSettings(): MediaTrackSettings;
-    stop(): void;
-    addEventListener<K extends keyof MediaStreamTrackEventMap>(type: K, listener: (this: MediaStreamTrack, ev: MediaStreamTrackEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof MediaStreamTrackEventMap>(type: K, listener: (this: MediaStreamTrack, ev: MediaStreamTrackEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var MediaStreamTrack: {
-    prototype: MediaStreamTrack;
-    new(): MediaStreamTrack;
-};
-
-interface MediaStreamTrackEvent extends Event {
-    readonly track: MediaStreamTrack;
-}
-
-declare var MediaStreamTrackEvent: {
-    prototype: MediaStreamTrackEvent;
-    new(typeArg: string, eventInitDict?: MediaStreamTrackEventInit): MediaStreamTrackEvent;
-};
-
-interface MessageChannel {
-    readonly port1: MessagePort;
-    readonly port2: MessagePort;
-}
-
-declare var MessageChannel: {
-    prototype: MessageChannel;
-    new(): MessageChannel;
-};
-
-interface MessageEvent extends Event {
-    readonly data: any;
-    readonly origin: string;
-    readonly ports: ReadonlyArray<MessagePort>;
-    readonly source: Window | null;
-    initMessageEvent(type: string, bubbles: boolean, cancelable: boolean, data: any, origin: string, lastEventId: string, source: Window): void;
-}
-
-declare var MessageEvent: {
-    prototype: MessageEvent;
-    new(type: string, eventInitDict?: MessageEventInit): MessageEvent;
-};
-
-interface MessagePortEventMap {
-    "message": MessageEvent;
-}
-
-interface MessagePort extends EventTarget {
-    onmessage: ((this: MessagePort, ev: MessageEvent) => any) | null;
-    close(): void;
-    postMessage(message?: any, transfer?: any[]): void;
-    start(): void;
-    addEventListener<K extends keyof MessagePortEventMap>(type: K, listener: (this: MessagePort, ev: MessagePortEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof MessagePortEventMap>(type: K, listener: (this: MessagePort, ev: MessagePortEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var MessagePort: {
-    prototype: MessagePort;
-    new(): MessagePort;
-};
-
-interface MimeType {
-    readonly description: string;
-    readonly enabledPlugin: Plugin;
-    readonly suffixes: string;
-    readonly type: string;
-}
-
-declare var MimeType: {
-    prototype: MimeType;
-    new(): MimeType;
-};
-
-interface MimeTypeArray {
-    readonly length: number;
-    item(index: number): Plugin;
-    namedItem(type: string): Plugin;
-    [index: number]: Plugin;
-}
-
-declare var MimeTypeArray: {
-    prototype: MimeTypeArray;
-    new(): MimeTypeArray;
-};
-
-interface MouseEvent extends UIEvent {
-    readonly altKey: boolean;
-    readonly button: number;
-    readonly buttons: number;
-    readonly clientX: number;
-    readonly clientY: number;
-    readonly ctrlKey: boolean;
-    /** @deprecated */
-    readonly fromElement: Element;
-    readonly layerX: number;
-    readonly layerY: number;
-    readonly metaKey: boolean;
-    readonly movementX: number;
-    readonly movementY: number;
-    readonly offsetX: number;
-    readonly offsetY: number;
-    readonly pageX: number;
-    readonly pageY: number;
-    readonly relatedTarget: EventTarget;
-    readonly screenX: number;
-    readonly screenY: number;
-    readonly shiftKey: boolean;
-    /** @deprecated */
-    readonly toElement: Element;
-    /** @deprecated */
-    readonly which: number;
-    readonly x: number;
-    readonly y: number;
-    getModifierState(keyArg: string): boolean;
-    initMouseEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number, screenXArg: number, screenYArg: number, clientXArg: number, clientYArg: number, ctrlKeyArg: boolean, altKeyArg: boolean, shiftKeyArg: boolean, metaKeyArg: boolean, buttonArg: number, relatedTargetArg: EventTarget | null): void;
-}
-
-declare var MouseEvent: {
-    prototype: MouseEvent;
-    new(typeArg: string, eventInitDict?: MouseEventInit): MouseEvent;
-};
-
-interface MutationEvent extends Event {
-    readonly attrChange: number;
-    readonly attrName: string;
-    readonly newValue: string;
-    readonly prevValue: string;
-    readonly relatedNode: Node;
-    initMutationEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, relatedNodeArg: Node, prevValueArg: string, newValueArg: string, attrNameArg: string, attrChangeArg: number): void;
-    readonly ADDITION: number;
-    readonly MODIFICATION: number;
-    readonly REMOVAL: number;
-}
-
-declare var MutationEvent: {
-    prototype: MutationEvent;
-    new(): MutationEvent;
-    readonly ADDITION: number;
-    readonly MODIFICATION: number;
-    readonly REMOVAL: number;
-};
-
-interface MutationObserver {
-    disconnect(): void;
-    observe(target: Node, options: MutationObserverInit): void;
-    takeRecords(): MutationRecord[];
-}
-
-declare var MutationObserver: {
-    prototype: MutationObserver;
-    new(callback: MutationCallback): MutationObserver;
-};
-
-interface MutationRecord {
-    readonly addedNodes: NodeList;
-    readonly attributeName: string | null;
-    readonly attributeNamespace: string | null;
-    readonly nextSibling: Node | null;
-    readonly oldValue: string | null;
-    readonly previousSibling: Node | null;
-    readonly removedNodes: NodeList;
-    readonly target: Node;
-    readonly type: MutationRecordType;
-}
-
-declare var MutationRecord: {
-    prototype: MutationRecord;
-    new(): MutationRecord;
-};
-
-interface NamedNodeMap {
-    readonly length: number;
-    getNamedItem(qualifiedName: string): Attr | null;
-    getNamedItemNS(namespace: string | null, localName: string): Attr | null;
-    item(index: number): Attr | null;
-    removeNamedItem(qualifiedName: string): Attr;
-    removeNamedItemNS(namespace: string | null, localName: string): Attr;
-    setNamedItem(attr: Attr): Attr | null;
-    setNamedItemNS(attr: Attr): Attr | null;
-    [index: number]: Attr;
-}
-
-declare var NamedNodeMap: {
-    prototype: NamedNodeMap;
-    new(): NamedNodeMap;
-};
-
-interface Navigator extends NavigatorID, NavigatorOnLine, NavigatorContentUtils, NavigatorStorageUtils, MSNavigatorDoNotTrack, MSFileSaver, NavigatorBeacon, NavigatorConcurrentHardware, NavigatorUserMedia, NavigatorLanguage {
-    readonly activeVRDisplays: ReadonlyArray<VRDisplay>;
-    readonly authentication: WebAuthentication;
-    readonly cookieEnabled: boolean;
-    readonly doNotTrack: string | null;
-    gamepadInputEmulation: GamepadInputEmulationType;
-    readonly geolocation: Geolocation;
-    readonly maxTouchPoints: number;
-    readonly mimeTypes: MimeTypeArray;
-    readonly msManipulationViewsEnabled: boolean;
-    readonly msMaxTouchPoints: number;
-    readonly msPointerEnabled: boolean;
-    readonly plugins: PluginArray;
-    readonly pointerEnabled: boolean;
-    readonly serviceWorker: ServiceWorkerContainer;
-    readonly webdriver: boolean;
-    getGamepads(): (Gamepad | null)[];
-    getVRDisplays(): Promise<VRDisplay[]>;
-    javaEnabled(): boolean;
-    msLaunchUri(uri: string, successCallback?: MSLaunchUriCallback, noHandlerCallback?: MSLaunchUriCallback): void;
-    requestMediaKeySystemAccess(keySystem: string, supportedConfigurations: MediaKeySystemConfiguration[]): Promise<MediaKeySystemAccess>;
-    vibrate(pattern: number | number[]): boolean;
-}
-
-declare var Navigator: {
-    prototype: Navigator;
-    new(): Navigator;
-};
-
-interface NavigatorBeacon {
-    sendBeacon(url: string, data?: Blob | Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | FormData | string | null): boolean;
-}
-
-interface NavigatorConcurrentHardware {
-    readonly hardwareConcurrency: number;
-}
-
-interface NavigatorContentUtils {
-}
-
-interface NavigatorID {
-    readonly appCodeName: string;
-    readonly appName: string;
-    readonly appVersion: string;
-    readonly platform: string;
-    readonly product: string;
-    readonly productSub: string;
-    readonly userAgent: string;
-    readonly vendor: string;
-    readonly vendorSub: string;
-}
-
-interface NavigatorLanguage {
-    readonly language: string;
-    readonly languages: ReadonlyArray<string>;
-}
-
-interface NavigatorOnLine {
-    readonly onLine: boolean;
-}
-
-interface NavigatorStorageUtils {
-}
-
-interface NavigatorUserMedia {
-    readonly mediaDevices: MediaDevices;
-    getDisplayMedia(constraints: MediaStreamConstraints): Promise<MediaStream>;
-    getUserMedia(constraints: MediaStreamConstraints, successCallback: NavigatorUserMediaSuccessCallback, errorCallback: NavigatorUserMediaErrorCallback): void;
-}
-
-interface Node extends EventTarget {
-    readonly baseURI: string | null;
-    readonly childNodes: NodeListOf<Node & ChildNode>;
-    readonly firstChild: Node | null;
-    readonly isConnected: boolean;
-    readonly lastChild: Node | null;
-    readonly localName: string | null;
-    readonly namespaceURI: string | null;
-    readonly nextSibling: Node | null;
-    readonly nodeName: string;
-    readonly nodeType: number;
-    nodeValue: string | null;
-    readonly ownerDocument: Document;
-    readonly parentElement: HTMLElement | null;
-    readonly parentNode: Node | null;
-    readonly previousSibling: Node | null;
-    textContent: string | null;
-    appendChild<T extends Node>(newChild: T): T;
-    cloneNode(deep?: boolean): Node;
-    compareDocumentPosition(other: Node): number;
-    contains(child: Node): boolean;
-    hasChildNodes(): boolean;
-    insertBefore<T extends Node>(newChild: T, refChild: Node | null): T;
-    isDefaultNamespace(namespaceURI: string | null): boolean;
-    isEqualNode(arg: Node): boolean;
-    isSameNode(other: Node): boolean;
-    lookupNamespaceURI(prefix: string | null): string | null;
-    lookupPrefix(namespaceURI: string | null): string | null;
-    normalize(): void;
-    removeChild<T extends Node>(oldChild: T): T;
-    replaceChild<T extends Node>(newChild: Node, oldChild: T): T;
-    readonly ATTRIBUTE_NODE: number;
-    readonly CDATA_SECTION_NODE: number;
-    readonly COMMENT_NODE: number;
-    readonly DOCUMENT_FRAGMENT_NODE: number;
-    readonly DOCUMENT_NODE: number;
-    readonly DOCUMENT_POSITION_CONTAINED_BY: number;
-    readonly DOCUMENT_POSITION_CONTAINS: number;
-    readonly DOCUMENT_POSITION_DISCONNECTED: number;
-    readonly DOCUMENT_POSITION_FOLLOWING: number;
-    readonly DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC: number;
-    readonly DOCUMENT_POSITION_PRECEDING: number;
-    readonly DOCUMENT_TYPE_NODE: number;
-    readonly ELEMENT_NODE: number;
-    readonly ENTITY_NODE: number;
-    readonly ENTITY_REFERENCE_NODE: number;
-    readonly NOTATION_NODE: number;
-    readonly PROCESSING_INSTRUCTION_NODE: number;
-    readonly TEXT_NODE: number;
-}
-
-declare var Node: {
-    prototype: Node;
-    new(): Node;
-    readonly ATTRIBUTE_NODE: number;
-    readonly CDATA_SECTION_NODE: number;
-    readonly COMMENT_NODE: number;
-    readonly DOCUMENT_FRAGMENT_NODE: number;
-    readonly DOCUMENT_NODE: number;
-    readonly DOCUMENT_POSITION_CONTAINED_BY: number;
-    readonly DOCUMENT_POSITION_CONTAINS: number;
-    readonly DOCUMENT_POSITION_DISCONNECTED: number;
-    readonly DOCUMENT_POSITION_FOLLOWING: number;
-    readonly DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC: number;
-    readonly DOCUMENT_POSITION_PRECEDING: number;
-    readonly DOCUMENT_TYPE_NODE: number;
-    readonly ELEMENT_NODE: number;
-    readonly ENTITY_NODE: number;
-    readonly ENTITY_REFERENCE_NODE: number;
-    readonly NOTATION_NODE: number;
-    readonly PROCESSING_INSTRUCTION_NODE: number;
-    readonly TEXT_NODE: number;
-};
-
-interface NodeFilter {
-    acceptNode(node: Node): number;
-}
-
-declare var NodeFilter: {
-    readonly FILTER_ACCEPT: number;
-    readonly FILTER_REJECT: number;
-    readonly FILTER_SKIP: number;
-    readonly SHOW_ALL: number;
-    readonly SHOW_ATTRIBUTE: number;
-    readonly SHOW_CDATA_SECTION: number;
-    readonly SHOW_COMMENT: number;
-    readonly SHOW_DOCUMENT: number;
-    readonly SHOW_DOCUMENT_FRAGMENT: number;
-    readonly SHOW_DOCUMENT_TYPE: number;
-    readonly SHOW_ELEMENT: number;
-    readonly SHOW_ENTITY: number;
-    readonly SHOW_ENTITY_REFERENCE: number;
-    readonly SHOW_NOTATION: number;
-    readonly SHOW_PROCESSING_INSTRUCTION: number;
-    readonly SHOW_TEXT: number;
-};
-
-interface NodeIterator {
-    /** @deprecated */
-    readonly expandEntityReferences: boolean;
-    readonly filter: NodeFilter | null;
-    readonly root: Node;
-    readonly whatToShow: number;
-    detach(): void;
-    nextNode(): Node | null;
-    previousNode(): Node | null;
-}
-
-declare var NodeIterator: {
-    prototype: NodeIterator;
-    new(): NodeIterator;
-};
-
-interface NodeList {
-    readonly length: number;
-    item(index: number): Node;
-    [index: number]: Node;
-}
-
-declare var NodeList: {
-    prototype: NodeList;
-    new(): NodeList;
-};
-
-interface NodeListOf<TNode extends Node> extends NodeList {
-    length: number;
-    item(index: number): TNode;
-    [index: number]: TNode;
-}
-
-interface NodeSelector {
-    querySelector<K extends keyof HTMLElementTagNameMap>(selectors: K): HTMLElementTagNameMap[K] | null;
-    querySelector<K extends keyof SVGElementTagNameMap>(selectors: K): SVGElementTagNameMap[K] | null;
-    querySelector<E extends Element = Element>(selectors: string): E | null;
-    querySelectorAll<K extends keyof HTMLElementTagNameMap>(selectors: K): NodeListOf<HTMLElementTagNameMap[K]>;
-    querySelectorAll<K extends keyof SVGElementTagNameMap>(selectors: K): NodeListOf<SVGElementTagNameMap[K]>;
-    querySelectorAll<E extends Element = Element>(selectors: string): NodeListOf<E>;
-}
-
-interface NotificationEventMap {
-    "click": Event;
-    "close": Event;
-    "error": Event;
-    "show": Event;
-}
-
-interface Notification extends EventTarget {
-    readonly body: string | null;
-    readonly data: any;
-    readonly dir: NotificationDirection;
-    readonly icon: string | null;
-    readonly lang: string | null;
-    onclick: ((this: Notification, ev: Event) => any) | null;
-    onclose: ((this: Notification, ev: Event) => any) | null;
-    onerror: ((this: Notification, ev: Event) => any) | null;
-    onshow: ((this: Notification, ev: Event) => any) | null;
-    readonly permission: NotificationPermission;
-    readonly tag: string | null;
-    readonly title: string;
-    close(): void;
-    addEventListener<K extends keyof NotificationEventMap>(type: K, listener: (this: Notification, ev: NotificationEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof NotificationEventMap>(type: K, listener: (this: Notification, ev: NotificationEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var Notification: {
-    prototype: Notification;
-    new(title: string, options?: NotificationOptions): Notification;
-    requestPermission(callback?: NotificationPermissionCallback): Promise<NotificationPermission>;
-};
-
-interface OES_element_index_uint {
-}
-
-declare var OES_element_index_uint: {
-    prototype: OES_element_index_uint;
-    new(): OES_element_index_uint;
-};
-
-interface OES_standard_derivatives {
-    readonly FRAGMENT_SHADER_DERIVATIVE_HINT_OES: number;
-}
-
-declare var OES_standard_derivatives: {
-    prototype: OES_standard_derivatives;
-    new(): OES_standard_derivatives;
-    readonly FRAGMENT_SHADER_DERIVATIVE_HINT_OES: number;
-};
-
-interface OES_texture_float {
-}
-
-declare var OES_texture_float: {
-    prototype: OES_texture_float;
-    new(): OES_texture_float;
-};
-
-interface OES_texture_float_linear {
-}
-
-declare var OES_texture_float_linear: {
-    prototype: OES_texture_float_linear;
-    new(): OES_texture_float_linear;
-};
-
-interface OES_texture_half_float {
-    readonly HALF_FLOAT_OES: number;
-}
-
-declare var OES_texture_half_float: {
-    prototype: OES_texture_half_float;
-    new(): OES_texture_half_float;
-    readonly HALF_FLOAT_OES: number;
-};
-
-interface OES_texture_half_float_linear {
-}
-
-declare var OES_texture_half_float_linear: {
-    prototype: OES_texture_half_float_linear;
-    new(): OES_texture_half_float_linear;
-};
-
-interface OES_vertex_array_object {
-    readonly VERTEX_ARRAY_BINDING_OES: number;
-    bindVertexArrayOES(arrayObject: WebGLVertexArrayObjectOES): void;
-    createVertexArrayOES(): WebGLVertexArrayObjectOES;
-    deleteVertexArrayOES(arrayObject: WebGLVertexArrayObjectOES): void;
-    isVertexArrayOES(value: any): value is WebGLVertexArrayObjectOES;
-}
-
-interface OfflineAudioCompletionEvent extends Event {
-    readonly renderedBuffer: AudioBuffer;
-}
-
-declare var OfflineAudioCompletionEvent: {
-    prototype: OfflineAudioCompletionEvent;
-    new(): OfflineAudioCompletionEvent;
-};
-
-interface OfflineAudioContextEventMap extends AudioContextEventMap {
-    "complete": OfflineAudioCompletionEvent;
-}
-
-interface OfflineAudioContext extends AudioContextBase {
-    readonly length: number;
-    oncomplete: ((this: OfflineAudioContext, ev: OfflineAudioCompletionEvent) => any) | null;
-    startRendering(): Promise<AudioBuffer>;
-    suspend(suspendTime: number): Promise<void>;
-    addEventListener<K extends keyof OfflineAudioContextEventMap>(type: K, listener: (this: OfflineAudioContext, ev: OfflineAudioContextEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof OfflineAudioContextEventMap>(type: K, listener: (this: OfflineAudioContext, ev: OfflineAudioContextEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var OfflineAudioContext: {
-    prototype: OfflineAudioContext;
-    new(numberOfChannels: number, length: number, sampleRate: number): OfflineAudioContext;
-};
-
-interface OscillatorNodeEventMap {
-    "ended": Event;
-}
-
-interface OscillatorNode extends AudioNode {
-    readonly detune: AudioParam;
-    readonly frequency: AudioParam;
-    onended: ((this: OscillatorNode, ev: Event) => any) | null;
-    type: OscillatorType;
-    setPeriodicWave(periodicWave: PeriodicWave): void;
-    start(when?: number): void;
-    stop(when?: number): void;
-    addEventListener<K extends keyof OscillatorNodeEventMap>(type: K, listener: (this: OscillatorNode, ev: OscillatorNodeEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof OscillatorNodeEventMap>(type: K, listener: (this: OscillatorNode, ev: OscillatorNodeEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var OscillatorNode: {
-    prototype: OscillatorNode;
-    new(): OscillatorNode;
-};
-
-interface OverflowEvent extends UIEvent {
-    readonly horizontalOverflow: boolean;
-    readonly orient: number;
-    readonly verticalOverflow: boolean;
-    readonly BOTH: number;
-    readonly HORIZONTAL: number;
-    readonly VERTICAL: number;
-}
-
-declare var OverflowEvent: {
-    prototype: OverflowEvent;
-    new(): OverflowEvent;
-    readonly BOTH: number;
-    readonly HORIZONTAL: number;
-    readonly VERTICAL: number;
-};
-
-interface PageTransitionEvent extends Event {
-    readonly persisted: boolean;
-}
-
-declare var PageTransitionEvent: {
-    prototype: PageTransitionEvent;
-    new(): PageTransitionEvent;
-};
-
-interface PannerNode extends AudioNode {
-    coneInnerAngle: number;
-    coneOuterAngle: number;
-    coneOuterGain: number;
-    distanceModel: DistanceModelType;
-    maxDistance: number;
-    panningModel: PanningModelType;
-    refDistance: number;
-    rolloffFactor: number;
-    /** @deprecated */
-    setOrientation(x: number, y: number, z: number): void;
-    /** @deprecated */
-    setPosition(x: number, y: number, z: number): void;
-    /** @deprecated */
-    setVelocity(x: number, y: number, z: number): void;
-}
-
-declare var PannerNode: {
-    prototype: PannerNode;
-    new(): PannerNode;
-};
-
-interface ParentNode {
-    readonly childElementCount: number;
-    readonly firstElementChild: Element | null;
-    readonly lastElementChild: Element | null;
-}
-
-interface ParentNode {
-    readonly children: HTMLCollection;
-    querySelector<K extends keyof HTMLElementTagNameMap>(selectors: K): HTMLElementTagNameMap[K] | null;
-    querySelector<K extends keyof SVGElementTagNameMap>(selectors: K): SVGElementTagNameMap[K] | null;
-    querySelector<E extends Element = Element>(selectors: string): E | null;
-    querySelectorAll<K extends keyof HTMLElementTagNameMap>(selectors: K): NodeListOf<HTMLElementTagNameMap[K]>;
-    querySelectorAll<K extends keyof SVGElementTagNameMap>(selectors: K): NodeListOf<SVGElementTagNameMap[K]>;
-    querySelectorAll<E extends Element = Element>(selectors: string): NodeListOf<E>;
-}
-
-interface Path2D extends CanvasPathMethods {
-}
-
-declare var Path2D: {
-    prototype: Path2D;
-    new(d?: Path2D | string): Path2D;
-};
-
-interface PaymentAddress {
-    readonly addressLine: string[];
-    readonly city: string;
-    readonly country: string;
-    readonly dependentLocality: string;
-    readonly languageCode: string;
-    readonly organization: string;
-    readonly phone: string;
-    readonly postalCode: string;
-    readonly recipient: string;
-    readonly region: string;
-    readonly sortingCode: string;
-    toJSON(): any;
-}
-
-declare var PaymentAddress: {
-    prototype: PaymentAddress;
-    new(): PaymentAddress;
-};
-
-interface PaymentRequestEventMap {
-    "shippingaddresschange": Event;
-    "shippingoptionchange": Event;
-}
-
-interface PaymentRequest extends EventTarget {
-    readonly id: string;
-    onshippingaddresschange: ((this: PaymentRequest, ev: Event) => any) | null;
-    onshippingoptionchange: ((this: PaymentRequest, ev: Event) => any) | null;
-    readonly shippingAddress: PaymentAddress | null;
-    readonly shippingOption: string | null;
-    readonly shippingType: PaymentShippingType | null;
-    abort(): Promise<void>;
-    canMakePayment(): Promise<boolean>;
-    show(): Promise<PaymentResponse>;
-    addEventListener<K extends keyof PaymentRequestEventMap>(type: K, listener: (this: PaymentRequest, ev: PaymentRequestEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof PaymentRequestEventMap>(type: K, listener: (this: PaymentRequest, ev: PaymentRequestEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var PaymentRequest: {
-    prototype: PaymentRequest;
-    new(methodData: PaymentMethodData[], details: PaymentDetailsInit, options?: PaymentOptions): PaymentRequest;
-};
-
-interface PaymentRequestUpdateEvent extends Event {
-    updateWith(detailsPromise: Promise<PaymentDetailsUpdate>): void;
-}
-
-declare var PaymentRequestUpdateEvent: {
-    prototype: PaymentRequestUpdateEvent;
-    new(type: string, eventInitDict?: PaymentRequestUpdateEventInit): PaymentRequestUpdateEvent;
-};
-
-interface PaymentResponse {
-    readonly details: any;
-    readonly methodName: string;
-    readonly payerEmail: string | null;
-    readonly payerName: string | null;
-    readonly payerPhone: string | null;
-    readonly requestId: string;
-    readonly shippingAddress: PaymentAddress | null;
-    readonly shippingOption: string | null;
-    complete(result?: PaymentComplete): Promise<void>;
-    toJSON(): any;
-}
-
-declare var PaymentResponse: {
-    prototype: PaymentResponse;
-    new(): PaymentResponse;
-};
-
-interface PerfWidgetExternal {
-    readonly activeNetworkRequestCount: number;
-    readonly averageFrameTime: number;
-    readonly averagePaintTime: number;
-    readonly extraInformationEnabled: boolean;
-    readonly independentRenderingEnabled: boolean;
-    readonly irDisablingContentString: string;
-    readonly irStatusAvailable: boolean;
-    readonly maxCpuSpeed: number;
-    readonly paintRequestsPerSecond: number;
-    readonly performanceCounter: number;
-    readonly performanceCounterFrequency: number;
-    addEventListener(eventType: string, callback: Function): void;
-    getMemoryUsage(): number;
-    getProcessCpuUsage(): number;
-    getRecentCpuUsage(last: number | null): any;
-    getRecentFrames(last: number | null): any;
-    getRecentMemoryUsage(last: number | null): any;
-    getRecentPaintRequests(last: number | null): any;
-    removeEventListener(eventType: string, callback: Function): void;
-    repositionWindow(x: number, y: number): void;
-    resizeWindow(width: number, height: number): void;
-}
-
-declare var PerfWidgetExternal: {
-    prototype: PerfWidgetExternal;
-    new(): PerfWidgetExternal;
-};
-
-interface Performance {
-    /** @deprecated */
-    readonly navigation: PerformanceNavigation;
-    readonly timeOrigin: number;
-    /** @deprecated */
-    readonly timing: PerformanceTiming;
-    clearMarks(markName?: string): void;
-    clearMeasures(measureName?: string): void;
-    clearResourceTimings(): void;
-    getEntries(): any;
-    getEntriesByName(name: string, type?: string): any;
-    getEntriesByType(type: string): any;
-    /** @deprecated */
-    getMarks(markName?: string): any;
-    /** @deprecated */
-    getMeasures(measureName?: string): any;
-    mark(markName: string): void;
-    measure(measureName: string, startMarkName?: string, endMarkName?: string): void;
-    now(): number;
-    setResourceTimingBufferSize(maxSize: number): void;
-    toJSON(): any;
-}
-
-declare var Performance: {
-    prototype: Performance;
-    new(): Performance;
-};
-
-interface PerformanceEntry {
-    readonly duration: number;
-    readonly entryType: string;
-    readonly name: string;
-    readonly startTime: number;
-    toJSON(): any;
-}
-
-declare var PerformanceEntry: {
-    prototype: PerformanceEntry;
-    new(): PerformanceEntry;
-};
-
-interface PerformanceMark extends PerformanceEntry {
-}
-
-declare var PerformanceMark: {
-    prototype: PerformanceMark;
-    new(): PerformanceMark;
-};
-
-interface PerformanceMeasure extends PerformanceEntry {
-}
-
-declare var PerformanceMeasure: {
-    prototype: PerformanceMeasure;
-    new(): PerformanceMeasure;
-};
-
-interface PerformanceNavigation {
-    readonly redirectCount: number;
-    readonly type: number;
-    toJSON(): any;
-    readonly TYPE_BACK_FORWARD: number;
-    readonly TYPE_NAVIGATE: number;
-    readonly TYPE_RELOAD: number;
-    readonly TYPE_RESERVED: number;
-}
-
-declare var PerformanceNavigation: {
-    prototype: PerformanceNavigation;
-    new(): PerformanceNavigation;
-    readonly TYPE_BACK_FORWARD: number;
-    readonly TYPE_NAVIGATE: number;
-    readonly TYPE_RELOAD: number;
-    readonly TYPE_RESERVED: number;
-};
-
-interface PerformanceNavigationTiming extends PerformanceEntry {
-    /** @deprecated */
-    readonly connectEnd: number;
-    /** @deprecated */
-    readonly connectStart: number;
-    readonly domComplete: number;
-    readonly domContentLoadedEventEnd: number;
-    readonly domContentLoadedEventStart: number;
-    readonly domInteractive: number;
-    /** @deprecated */
-    readonly domLoading: number;
-    /** @deprecated */
-    readonly domainLookupEnd: number;
-    /** @deprecated */
-    readonly domainLookupStart: number;
-    /** @deprecated */
-    readonly fetchStart: number;
-    readonly loadEventEnd: number;
-    readonly loadEventStart: number;
-    /** @deprecated */
-    readonly navigationStart: number;
-    readonly redirectCount: number;
-    /** @deprecated */
-    readonly redirectEnd: number;
-    /** @deprecated */
-    readonly redirectStart: number;
-    /** @deprecated */
-    readonly requestStart: number;
-    /** @deprecated */
-    readonly responseEnd: number;
-    /** @deprecated */
-    readonly responseStart: number;
-    readonly type: NavigationType;
-    readonly unloadEventEnd: number;
-    readonly unloadEventStart: number;
-    readonly workerStart: number;
-}
-
-declare var PerformanceNavigationTiming: {
-    prototype: PerformanceNavigationTiming;
-    new(): PerformanceNavigationTiming;
-};
-
-interface PerformanceResourceTiming extends PerformanceEntry {
-    readonly connectEnd: number;
-    readonly connectStart: number;
-    readonly domainLookupEnd: number;
-    readonly domainLookupStart: number;
-    readonly fetchStart: number;
-    readonly initiatorType: string;
-    readonly redirectEnd: number;
-    readonly redirectStart: number;
-    readonly requestStart: number;
-    readonly responseEnd: number;
-    readonly responseStart: number;
-    readonly workerStart: number;
-}
-
-declare var PerformanceResourceTiming: {
-    prototype: PerformanceResourceTiming;
-    new(): PerformanceResourceTiming;
-};
-
-interface PerformanceTiming {
-    readonly connectEnd: number;
-    readonly connectStart: number;
-    readonly domComplete: number;
-    readonly domContentLoadedEventEnd: number;
-    readonly domContentLoadedEventStart: number;
-    readonly domInteractive: number;
-    readonly domLoading: number;
-    readonly domainLookupEnd: number;
-    readonly domainLookupStart: number;
-    readonly fetchStart: number;
-    readonly loadEventEnd: number;
-    readonly loadEventStart: number;
-    readonly msFirstPaint: number;
-    readonly navigationStart: number;
-    readonly redirectEnd: number;
-    readonly redirectStart: number;
-    readonly requestStart: number;
-    readonly responseEnd: number;
-    readonly responseStart: number;
-    readonly secureConnectionStart: number;
-    readonly unloadEventEnd: number;
-    readonly unloadEventStart: number;
-    toJSON(): any;
-}
-
-declare var PerformanceTiming: {
-    prototype: PerformanceTiming;
-    new(): PerformanceTiming;
-};
-
-interface PeriodicWave {
-}
-
-declare var PeriodicWave: {
-    prototype: PeriodicWave;
-    new(): PeriodicWave;
-};
-
-interface PermissionRequest extends DeferredPermissionRequest {
-    readonly state: MSWebViewPermissionState;
-    defer(): void;
-}
-
-declare var PermissionRequest: {
-    prototype: PermissionRequest;
-    new(): PermissionRequest;
-};
-
-interface PermissionRequestedEvent extends Event {
-    readonly permissionRequest: PermissionRequest;
-}
-
-declare var PermissionRequestedEvent: {
-    prototype: PermissionRequestedEvent;
-    new(): PermissionRequestedEvent;
-};
-
-interface Plugin {
-    readonly description: string;
-    readonly filename: string;
-    readonly length: number;
-    readonly name: string;
-    readonly version: string;
-    item(index: number): MimeType;
-    namedItem(type: string): MimeType;
-    [index: number]: MimeType;
-}
-
-declare var Plugin: {
-    prototype: Plugin;
-    new(): Plugin;
-};
-
-interface PluginArray {
-    readonly length: number;
-    item(index: number): Plugin;
-    namedItem(name: string): Plugin;
-    refresh(reload?: boolean): void;
-    [index: number]: Plugin;
-}
-
-declare var PluginArray: {
-    prototype: PluginArray;
-    new(): PluginArray;
-};
-
-interface PointerEvent extends MouseEvent {
-    readonly currentPoint: any;
-    readonly height: number;
-    readonly hwTimestamp: number;
-    readonly intermediatePoints: any;
-    readonly isPrimary: boolean;
-    readonly pointerId: number;
-    readonly pointerType: any;
-    readonly pressure: number;
-    readonly rotation: number;
-    readonly tiltX: number;
-    readonly tiltY: number;
-    readonly width: number;
-    getCurrentPoint(element: Element): void;
-    getIntermediatePoints(element: Element): void;
-    initPointerEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number, screenXArg: number, screenYArg: number, clientXArg: number, clientYArg: number, ctrlKeyArg: boolean, altKeyArg: boolean, shiftKeyArg: boolean, metaKeyArg: boolean, buttonArg: number, relatedTargetArg: EventTarget, offsetXArg: number, offsetYArg: number, widthArg: number, heightArg: number, pressure: number, rotation: number, tiltX: number, tiltY: number, pointerIdArg: number, pointerType: any, hwTimestampArg: number, isPrimary: boolean): void;
-}
-
-declare var PointerEvent: {
-    prototype: PointerEvent;
-    new(typeArg: string, eventInitDict?: PointerEventInit): PointerEvent;
-};
-
-interface PopStateEvent extends Event {
-    readonly state: any;
-}
-
-declare var PopStateEvent: {
-    prototype: PopStateEvent;
-    new(type: string, eventInitDict?: PopStateEventInit): PopStateEvent;
-};
-
-interface Position {
-    readonly coords: Coordinates;
-    readonly timestamp: number;
-}
-
-declare var Position: {
-    prototype: Position;
-    new(): Position;
-};
-
-interface PositionError {
-    readonly code: number;
-    readonly message: string;
-    toString(): string;
-    readonly PERMISSION_DENIED: number;
-    readonly POSITION_UNAVAILABLE: number;
-    readonly TIMEOUT: number;
-}
-
-declare var PositionError: {
-    prototype: PositionError;
-    new(): PositionError;
-    readonly PERMISSION_DENIED: number;
-    readonly POSITION_UNAVAILABLE: number;
-    readonly TIMEOUT: number;
-};
-
-interface ProcessingInstruction extends CharacterData {
-    readonly target: string;
-}
-
-declare var ProcessingInstruction: {
-    prototype: ProcessingInstruction;
-    new(): ProcessingInstruction;
-};
-
-interface ProgressEvent extends Event {
-    readonly lengthComputable: boolean;
-    readonly loaded: number;
-    readonly total: number;
-    initProgressEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, lengthComputableArg: boolean, loadedArg: number, totalArg: number): void;
-}
-
-declare var ProgressEvent: {
-    prototype: ProgressEvent;
-    new(typeArg: string, eventInitDict?: ProgressEventInit): ProgressEvent;
-};
-
-interface PromiseRejectionEvent extends Event {
-    readonly promise: PromiseLike<any>;
-    readonly reason: any;
-}
-
-interface PromiseRejectionEventInit extends EventInit {
-    promise: PromiseLike<any>;
-    reason?: any;
-}
-
-interface PushManager {
-    readonly supportedContentEncodings: ReadonlyArray<string>;
-    getSubscription(): Promise<PushSubscription | null>;
-    permissionState(options?: PushSubscriptionOptionsInit): Promise<PushPermissionState>;
-    subscribe(options?: PushSubscriptionOptionsInit): Promise<PushSubscription>;
-}
-
-declare var PushManager: {
-    prototype: PushManager;
-    new(): PushManager;
-};
-
-interface PushSubscription {
-    readonly endpoint: string;
-    readonly expirationTime: number | null;
-    readonly options: PushSubscriptionOptions;
-    getKey(name: PushEncryptionKeyName): ArrayBuffer | null;
-    toJSON(): any;
-    unsubscribe(): Promise<boolean>;
-}
-
-declare var PushSubscription: {
-    prototype: PushSubscription;
-    new(): PushSubscription;
-};
-
-interface PushSubscriptionOptions {
-    readonly applicationServerKey: ArrayBuffer | null;
-    readonly userVisibleOnly: boolean;
-}
-
-declare var PushSubscriptionOptions: {
-    prototype: PushSubscriptionOptions;
-    new(): PushSubscriptionOptions;
-};
-
-interface RTCDTMFToneChangeEvent extends Event {
-    readonly tone: string;
-}
-
-declare var RTCDTMFToneChangeEvent: {
-    prototype: RTCDTMFToneChangeEvent;
-    new(typeArg: string, eventInitDict: RTCDTMFToneChangeEventInit): RTCDTMFToneChangeEvent;
-};
-
-interface RTCDtlsTransportEventMap {
-    "dtlsstatechange": RTCDtlsTransportStateChangedEvent;
-    "error": Event;
-}
-
-interface RTCDtlsTransport extends RTCStatsProvider {
-    ondtlsstatechange: ((this: RTCDtlsTransport, ev: RTCDtlsTransportStateChangedEvent) => any) | null;
-    onerror: ((this: RTCDtlsTransport, ev: Event) => any) | null;
-    readonly state: RTCDtlsTransportState;
-    readonly transport: RTCIceTransport;
-    getLocalParameters(): RTCDtlsParameters;
-    getRemoteCertificates(): ArrayBuffer[];
-    getRemoteParameters(): RTCDtlsParameters | null;
-    start(remoteParameters: RTCDtlsParameters): void;
-    stop(): void;
-    addEventListener<K extends keyof RTCDtlsTransportEventMap>(type: K, listener: (this: RTCDtlsTransport, ev: RTCDtlsTransportEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCDtlsTransportEventMap>(type: K, listener: (this: RTCDtlsTransport, ev: RTCDtlsTransportEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var RTCDtlsTransport: {
-    prototype: RTCDtlsTransport;
-    new(transport: RTCIceTransport): RTCDtlsTransport;
-};
-
-interface RTCDtlsTransportStateChangedEvent extends Event {
-    readonly state: RTCDtlsTransportState;
-}
-
-declare var RTCDtlsTransportStateChangedEvent: {
-    prototype: RTCDtlsTransportStateChangedEvent;
-    new(): RTCDtlsTransportStateChangedEvent;
-};
-
-interface RTCDtmfSenderEventMap {
-    "tonechange": RTCDTMFToneChangeEvent;
-}
-
-interface RTCDtmfSender extends EventTarget {
-    readonly canInsertDTMF: boolean;
-    readonly duration: number;
-    readonly interToneGap: number;
-    ontonechange: ((this: RTCDtmfSender, ev: RTCDTMFToneChangeEvent) => any) | null;
-    readonly sender: RTCRtpSender;
-    readonly toneBuffer: string;
-    insertDTMF(tones: string, duration?: number, interToneGap?: number): void;
-    addEventListener<K extends keyof RTCDtmfSenderEventMap>(type: K, listener: (this: RTCDtmfSender, ev: RTCDtmfSenderEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCDtmfSenderEventMap>(type: K, listener: (this: RTCDtmfSender, ev: RTCDtmfSenderEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var RTCDtmfSender: {
-    prototype: RTCDtmfSender;
-    new(sender: RTCRtpSender): RTCDtmfSender;
-};
-
-interface RTCIceCandidate {
-    candidate: string | null;
-    sdpMLineIndex: number | null;
-    sdpMid: string | null;
-    toJSON(): any;
-}
-
-declare var RTCIceCandidate: {
-    prototype: RTCIceCandidate;
-    new(candidateInitDict?: RTCIceCandidateInit): RTCIceCandidate;
-};
-
-interface RTCIceCandidatePairChangedEvent extends Event {
-    readonly pair: RTCIceCandidatePair;
-}
-
-declare var RTCIceCandidatePairChangedEvent: {
-    prototype: RTCIceCandidatePairChangedEvent;
-    new(): RTCIceCandidatePairChangedEvent;
-};
-
-interface RTCIceGathererEventMap {
-    "error": Event;
-    "localcandidate": RTCIceGathererEvent;
-}
-
-interface RTCIceGatherer extends RTCStatsProvider {
-    readonly component: RTCIceComponent;
-    onerror: ((this: RTCIceGatherer, ev: Event) => any) | null;
-    onlocalcandidate: ((this: RTCIceGatherer, ev: RTCIceGathererEvent) => any) | null;
-    createAssociatedGatherer(): RTCIceGatherer;
-    getLocalCandidates(): RTCIceCandidateDictionary[];
-    getLocalParameters(): RTCIceParameters;
-    addEventListener<K extends keyof RTCIceGathererEventMap>(type: K, listener: (this: RTCIceGatherer, ev: RTCIceGathererEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCIceGathererEventMap>(type: K, listener: (this: RTCIceGatherer, ev: RTCIceGathererEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var RTCIceGatherer: {
-    prototype: RTCIceGatherer;
-    new(options: RTCIceGatherOptions): RTCIceGatherer;
-};
-
-interface RTCIceGathererEvent extends Event {
-    readonly candidate: RTCIceCandidateDictionary | RTCIceCandidateComplete;
-}
-
-declare var RTCIceGathererEvent: {
-    prototype: RTCIceGathererEvent;
-    new(): RTCIceGathererEvent;
-};
-
-interface RTCIceTransportEventMap {
-    "candidatepairchange": RTCIceCandidatePairChangedEvent;
-    "icestatechange": RTCIceTransportStateChangedEvent;
-}
-
-interface RTCIceTransport extends RTCStatsProvider {
-    readonly component: RTCIceComponent;
-    readonly iceGatherer: RTCIceGatherer | null;
-    oncandidatepairchange: ((this: RTCIceTransport, ev: RTCIceCandidatePairChangedEvent) => any) | null;
-    onicestatechange: ((this: RTCIceTransport, ev: RTCIceTransportStateChangedEvent) => any) | null;
-    readonly role: RTCIceRole;
-    readonly state: RTCIceTransportState;
-    addRemoteCandidate(remoteCandidate: RTCIceCandidateDictionary | RTCIceCandidateComplete): void;
-    createAssociatedTransport(): RTCIceTransport;
-    getNominatedCandidatePair(): RTCIceCandidatePair | null;
-    getRemoteCandidates(): RTCIceCandidateDictionary[];
-    getRemoteParameters(): RTCIceParameters | null;
-    setRemoteCandidates(remoteCandidates: RTCIceCandidateDictionary[]): void;
-    start(gatherer: RTCIceGatherer, remoteParameters: RTCIceParameters, role?: RTCIceRole): void;
-    stop(): void;
-    addEventListener<K extends keyof RTCIceTransportEventMap>(type: K, listener: (this: RTCIceTransport, ev: RTCIceTransportEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCIceTransportEventMap>(type: K, listener: (this: RTCIceTransport, ev: RTCIceTransportEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var RTCIceTransport: {
-    prototype: RTCIceTransport;
-    new(): RTCIceTransport;
-};
-
-interface RTCIceTransportStateChangedEvent extends Event {
-    readonly state: RTCIceTransportState;
-}
-
-declare var RTCIceTransportStateChangedEvent: {
-    prototype: RTCIceTransportStateChangedEvent;
-    new(): RTCIceTransportStateChangedEvent;
-};
-
-interface RTCPeerConnectionEventMap {
-    "addstream": MediaStreamEvent;
-    "icecandidate": RTCPeerConnectionIceEvent;
-    "iceconnectionstatechange": Event;
-    "icegatheringstatechange": Event;
-    "negotiationneeded": Event;
-    "removestream": MediaStreamEvent;
-    "signalingstatechange": Event;
-}
-
-interface RTCPeerConnection extends EventTarget {
-    readonly canTrickleIceCandidates: boolean | null;
-    readonly iceConnectionState: RTCIceConnectionState;
-    readonly iceGatheringState: RTCIceGatheringState;
-    readonly localDescription: RTCSessionDescription | null;
-    onaddstream: ((this: RTCPeerConnection, ev: MediaStreamEvent) => any) | null;
-    onicecandidate: ((this: RTCPeerConnection, ev: RTCPeerConnectionIceEvent) => any) | null;
-    oniceconnectionstatechange: ((this: RTCPeerConnection, ev: Event) => any) | null;
-    onicegatheringstatechange: ((this: RTCPeerConnection, ev: Event) => any) | null;
-    onnegotiationneeded: ((this: RTCPeerConnection, ev: Event) => any) | null;
-    onremovestream: ((this: RTCPeerConnection, ev: MediaStreamEvent) => any) | null;
-    onsignalingstatechange: ((this: RTCPeerConnection, ev: Event) => any) | null;
-    readonly remoteDescription: RTCSessionDescription | null;
-    readonly signalingState: RTCSignalingState;
-    addIceCandidate(candidate: RTCIceCandidateInit | RTCIceCandidate): Promise<void>;
-    addStream(stream: MediaStream): void;
-    close(): void;
-    createAnswer(options?: RTCOfferOptions): Promise<RTCSessionDescriptionInit>;
-    createOffer(options?: RTCOfferOptions): Promise<RTCSessionDescriptionInit>;
-    getConfiguration(): RTCConfiguration;
-    getLocalStreams(): MediaStream[];
-    getRemoteStreams(): MediaStream[];
-    getStats(selector: MediaStreamTrack | null, successCallback?: RTCStatsCallback, failureCallback?: RTCPeerConnectionErrorCallback): Promise<RTCStatsReport>;
-    getStreamById(streamId: string): MediaStream | null;
-    removeStream(stream: MediaStream): void;
-    setLocalDescription(description: RTCSessionDescriptionInit): Promise<void>;
-    setRemoteDescription(description: RTCSessionDescriptionInit): Promise<void>;
-    addEventListener<K extends keyof RTCPeerConnectionEventMap>(type: K, listener: (this: RTCPeerConnection, ev: RTCPeerConnectionEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCPeerConnectionEventMap>(type: K, listener: (this: RTCPeerConnection, ev: RTCPeerConnectionEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var RTCPeerConnection: {
-    prototype: RTCPeerConnection;
-    new(configuration: RTCConfiguration): RTCPeerConnection;
-};
-
-interface RTCPeerConnectionIceEvent extends Event {
-    readonly candidate: RTCIceCandidate;
-}
-
-declare var RTCPeerConnectionIceEvent: {
-    prototype: RTCPeerConnectionIceEvent;
-    new(type: string, eventInitDict: RTCPeerConnectionIceEventInit): RTCPeerConnectionIceEvent;
-};
-
-interface RTCRtpReceiverEventMap {
-    "error": Event;
-    "msdecodercapacitychange": Event;
-    "msdsh": Event;
-}
-
-interface RTCRtpReceiver extends RTCStatsProvider {
-    onerror: ((this: RTCRtpReceiver, ev: Event) => any) | null;
-    onmsdecodercapacitychange: ((this: RTCRtpReceiver, ev: Event) => any) | null;
-    onmsdsh: ((this: RTCRtpReceiver, ev: Event) => any) | null;
-    readonly rtcpTransport: RTCDtlsTransport;
-    readonly track: MediaStreamTrack | null;
-    readonly transport: RTCDtlsTransport | RTCSrtpSdesTransport;
-    getContributingSources(): RTCRtpContributingSource[];
-    receive(parameters: RTCRtpParameters): void;
-    requestSendCSRC(csrc: number): void;
-    setTransport(transport: RTCDtlsTransport | RTCSrtpSdesTransport, rtcpTransport?: RTCDtlsTransport): void;
-    stop(): void;
-    addEventListener<K extends keyof RTCRtpReceiverEventMap>(type: K, listener: (this: RTCRtpReceiver, ev: RTCRtpReceiverEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCRtpReceiverEventMap>(type: K, listener: (this: RTCRtpReceiver, ev: RTCRtpReceiverEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var RTCRtpReceiver: {
-    prototype: RTCRtpReceiver;
-    new(transport: RTCDtlsTransport | RTCSrtpSdesTransport, kind: string, rtcpTransport?: RTCDtlsTransport): RTCRtpReceiver;
-    getCapabilities(kind?: string): RTCRtpCapabilities;
-};
-
-interface RTCRtpSenderEventMap {
-    "error": Event;
-    "ssrcconflict": RTCSsrcConflictEvent;
-}
-
-interface RTCRtpSender extends RTCStatsProvider {
-    onerror: ((this: RTCRtpSender, ev: Event) => any) | null;
-    onssrcconflict: ((this: RTCRtpSender, ev: RTCSsrcConflictEvent) => any) | null;
-    readonly rtcpTransport: RTCDtlsTransport;
-    readonly track: MediaStreamTrack;
-    readonly transport: RTCDtlsTransport | RTCSrtpSdesTransport;
-    send(parameters: RTCRtpParameters): void;
-    setTrack(track: MediaStreamTrack): void;
-    setTransport(transport: RTCDtlsTransport | RTCSrtpSdesTransport, rtcpTransport?: RTCDtlsTransport): void;
-    stop(): void;
-    addEventListener<K extends keyof RTCRtpSenderEventMap>(type: K, listener: (this: RTCRtpSender, ev: RTCRtpSenderEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCRtpSenderEventMap>(type: K, listener: (this: RTCRtpSender, ev: RTCRtpSenderEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var RTCRtpSender: {
-    prototype: RTCRtpSender;
-    new(track: MediaStreamTrack, transport: RTCDtlsTransport | RTCSrtpSdesTransport, rtcpTransport?: RTCDtlsTransport): RTCRtpSender;
-    getCapabilities(kind?: string): RTCRtpCapabilities;
-};
-
-interface RTCSessionDescription {
-    sdp: string | null;
-    type: RTCSdpType | null;
-    toJSON(): any;
-}
-
-declare var RTCSessionDescription: {
-    prototype: RTCSessionDescription;
-    new(descriptionInitDict?: RTCSessionDescriptionInit): RTCSessionDescription;
-};
-
-interface RTCSrtpSdesTransportEventMap {
-    "error": Event;
-}
-
-interface RTCSrtpSdesTransport extends EventTarget {
-    onerror: ((this: RTCSrtpSdesTransport, ev: Event) => any) | null;
-    readonly transport: RTCIceTransport;
-    addEventListener<K extends keyof RTCSrtpSdesTransportEventMap>(type: K, listener: (this: RTCSrtpSdesTransport, ev: RTCSrtpSdesTransportEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCSrtpSdesTransportEventMap>(type: K, listener: (this: RTCSrtpSdesTransport, ev: RTCSrtpSdesTransportEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var RTCSrtpSdesTransport: {
-    prototype: RTCSrtpSdesTransport;
-    new(transport: RTCIceTransport, encryptParameters: RTCSrtpSdesParameters, decryptParameters: RTCSrtpSdesParameters): RTCSrtpSdesTransport;
-    getLocalParameters(): RTCSrtpSdesParameters[];
-};
-
-interface RTCSsrcConflictEvent extends Event {
-    readonly ssrc: number;
-}
-
-declare var RTCSsrcConflictEvent: {
-    prototype: RTCSsrcConflictEvent;
-    new(): RTCSsrcConflictEvent;
-};
-
-interface RTCStatsProvider extends EventTarget {
-    getStats(): Promise<RTCStatsReport>;
-    msGetStats(): Promise<RTCStatsReport>;
-}
-
-declare var RTCStatsProvider: {
-    prototype: RTCStatsProvider;
-    new(): RTCStatsProvider;
-};
-
-interface RandomSource {
-    getRandomValues<T extends Int8Array | Uint8ClampedArray | Uint8Array | Int16Array | Uint16Array | Int32Array | Uint32Array>(array: T): T;
-}
-
-declare var RandomSource: {
-    prototype: RandomSource;
-    new(): RandomSource;
-};
-
-interface Range {
-    readonly collapsed: boolean;
-    readonly commonAncestorContainer: Node;
-    readonly endContainer: Node;
-    readonly endOffset: number;
-    readonly startContainer: Node;
-    readonly startOffset: number;
-    cloneContents(): DocumentFragment;
-    cloneRange(): Range;
-    collapse(toStart?: boolean): void;
-    compareBoundaryPoints(how: number, sourceRange: Range): number;
-    createContextualFragment(fragment: string): DocumentFragment;
-    deleteContents(): void;
-    detach(): void;
-    expand(Unit: ExpandGranularity): boolean;
-    extractContents(): DocumentFragment;
-    getBoundingClientRect(): ClientRect | DOMRect;
-    getClientRects(): ClientRectList | DOMRectList;
-    insertNode(node: Node): void;
-    isPointInRange(node: Node, offset: number): boolean;
-    selectNode(node: Node): void;
-    selectNodeContents(node: Node): void;
-    setEnd(node: Node, offset: number): void;
-    setEndAfter(node: Node): void;
-    setEndBefore(node: Node): void;
-    setStart(node: Node, offset: number): void;
-    setStartAfter(node: Node): void;
-    setStartBefore(node: Node): void;
-    surroundContents(newParent: Node): void;
-    toString(): string;
-    readonly END_TO_END: number;
-    readonly END_TO_START: number;
-    readonly START_TO_END: number;
-    readonly START_TO_START: number;
-}
-
-declare var Range: {
-    prototype: Range;
-    new(): Range;
-    readonly END_TO_END: number;
-    readonly END_TO_START: number;
-    readonly START_TO_END: number;
-    readonly START_TO_START: number;
-};
-
-interface ReadableStream {
-    readonly locked: boolean;
-    cancel(): Promise<void>;
-    getReader(): ReadableStreamReader;
-}
-
-declare var ReadableStream: {
-    prototype: ReadableStream;
-    new(): ReadableStream;
-};
-
-interface ReadableStreamReader {
-    cancel(): Promise<void>;
-    read(): Promise<any>;
-    releaseLock(): void;
-}
-
-declare var ReadableStreamReader: {
-    prototype: ReadableStreamReader;
-    new(): ReadableStreamReader;
-};
-
-interface Request extends Body {
-    readonly cache: RequestCache;
-    readonly credentials: RequestCredentials;
-    readonly destination: RequestDestination;
-    readonly headers: Headers;
-    readonly integrity: string;
-    readonly keepalive: boolean;
-    readonly method: string;
-    readonly mode: RequestMode;
-    readonly redirect: RequestRedirect;
-    readonly referrer: string;
-    readonly referrerPolicy: ReferrerPolicy;
-    readonly signal: AbortSignal | null;
-    readonly type: RequestType;
-    readonly url: string;
-    clone(): Request;
-}
-
-declare var Request: {
-    prototype: Request;
-    new(input: Request | string, init?: RequestInit): Request;
-};
-
-interface Response extends Body {
-    readonly body: ReadableStream | null;
-    readonly headers: Headers;
-    readonly ok: boolean;
-    readonly redirected: boolean;
-    readonly status: number;
-    readonly statusText: string;
-    readonly type: ResponseType;
-    readonly url: string;
-    clone(): Response;
-}
-
-declare var Response: {
-    prototype: Response;
-    new(body?: Blob | Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | FormData | string | null, init?: ResponseInit): Response;
-    error(): Response;
-    redirect(url: string, status?: number): Response;
-};
-
-interface SVGAElement extends SVGGraphicsElement, SVGURIReference {
-    readonly target: SVGAnimatedString;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGAElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGAElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGAElement: {
-    prototype: SVGAElement;
-    new(): SVGAElement;
-};
-
-interface SVGAngle {
-    readonly unitType: number;
-    value: number;
-    valueAsString: string;
-    valueInSpecifiedUnits: number;
-    convertToSpecifiedUnits(unitType: number): void;
-    newValueSpecifiedUnits(unitType: number, valueInSpecifiedUnits: number): void;
-    readonly SVG_ANGLETYPE_DEG: number;
-    readonly SVG_ANGLETYPE_GRAD: number;
-    readonly SVG_ANGLETYPE_RAD: number;
-    readonly SVG_ANGLETYPE_UNKNOWN: number;
-    readonly SVG_ANGLETYPE_UNSPECIFIED: number;
-}
-
-declare var SVGAngle: {
-    prototype: SVGAngle;
-    new(): SVGAngle;
-    readonly SVG_ANGLETYPE_DEG: number;
-    readonly SVG_ANGLETYPE_GRAD: number;
-    readonly SVG_ANGLETYPE_RAD: number;
-    readonly SVG_ANGLETYPE_UNKNOWN: number;
-    readonly SVG_ANGLETYPE_UNSPECIFIED: number;
-};
-
-interface SVGAnimatedAngle {
-    readonly animVal: SVGAngle;
-    readonly baseVal: SVGAngle;
-}
-
-declare var SVGAnimatedAngle: {
-    prototype: SVGAnimatedAngle;
-    new(): SVGAnimatedAngle;
-};
-
-interface SVGAnimatedBoolean {
-    readonly animVal: boolean;
-    baseVal: boolean;
-}
-
-declare var SVGAnimatedBoolean: {
-    prototype: SVGAnimatedBoolean;
-    new(): SVGAnimatedBoolean;
-};
-
-interface SVGAnimatedEnumeration {
-    readonly animVal: number;
-    baseVal: number;
-}
-
-declare var SVGAnimatedEnumeration: {
-    prototype: SVGAnimatedEnumeration;
-    new(): SVGAnimatedEnumeration;
-};
-
-interface SVGAnimatedInteger {
-    readonly animVal: number;
-    baseVal: number;
-}
-
-declare var SVGAnimatedInteger: {
-    prototype: SVGAnimatedInteger;
-    new(): SVGAnimatedInteger;
-};
-
-interface SVGAnimatedLength {
-    readonly animVal: SVGLength;
-    readonly baseVal: SVGLength;
-}
-
-declare var SVGAnimatedLength: {
-    prototype: SVGAnimatedLength;
-    new(): SVGAnimatedLength;
-};
-
-interface SVGAnimatedLengthList {
-    readonly animVal: SVGLengthList;
-    readonly baseVal: SVGLengthList;
-}
-
-declare var SVGAnimatedLengthList: {
-    prototype: SVGAnimatedLengthList;
-    new(): SVGAnimatedLengthList;
-};
-
-interface SVGAnimatedNumber {
-    readonly animVal: number;
-    baseVal: number;
-}
-
-declare var SVGAnimatedNumber: {
-    prototype: SVGAnimatedNumber;
-    new(): SVGAnimatedNumber;
-};
-
-interface SVGAnimatedNumberList {
-    readonly animVal: SVGNumberList;
-    readonly baseVal: SVGNumberList;
-}
-
-declare var SVGAnimatedNumberList: {
-    prototype: SVGAnimatedNumberList;
-    new(): SVGAnimatedNumberList;
-};
-
-interface SVGAnimatedPoints {
-    readonly animatedPoints: SVGPointList;
-    readonly points: SVGPointList;
-}
-
-interface SVGAnimatedPreserveAspectRatio {
-    readonly animVal: SVGPreserveAspectRatio;
-    readonly baseVal: SVGPreserveAspectRatio;
-}
-
-declare var SVGAnimatedPreserveAspectRatio: {
-    prototype: SVGAnimatedPreserveAspectRatio;
-    new(): SVGAnimatedPreserveAspectRatio;
-};
-
-interface SVGAnimatedRect {
-    readonly animVal: SVGRect;
-    readonly baseVal: SVGRect;
-}
-
-declare var SVGAnimatedRect: {
-    prototype: SVGAnimatedRect;
-    new(): SVGAnimatedRect;
-};
-
-interface SVGAnimatedString {
-    readonly animVal: string;
-    baseVal: string;
-}
-
-declare var SVGAnimatedString: {
-    prototype: SVGAnimatedString;
-    new(): SVGAnimatedString;
-};
-
-interface SVGAnimatedTransformList {
-    readonly animVal: SVGTransformList;
-    readonly baseVal: SVGTransformList;
-}
-
-declare var SVGAnimatedTransformList: {
-    prototype: SVGAnimatedTransformList;
-    new(): SVGAnimatedTransformList;
-};
-
-interface SVGCircleElement extends SVGGraphicsElement {
-    readonly cx: SVGAnimatedLength;
-    readonly cy: SVGAnimatedLength;
-    readonly r: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGCircleElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGCircleElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGCircleElement: {
-    prototype: SVGCircleElement;
-    new(): SVGCircleElement;
-};
-
-interface SVGClipPathElement extends SVGGraphicsElement, SVGUnitTypes {
-    readonly clipPathUnits: SVGAnimatedEnumeration;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGClipPathElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGClipPathElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGClipPathElement: {
-    prototype: SVGClipPathElement;
-    new(): SVGClipPathElement;
-};
-
-interface SVGComponentTransferFunctionElement extends SVGElement {
-    readonly amplitude: SVGAnimatedNumber;
-    readonly exponent: SVGAnimatedNumber;
-    readonly intercept: SVGAnimatedNumber;
-    readonly offset: SVGAnimatedNumber;
-    readonly slope: SVGAnimatedNumber;
-    readonly tableValues: SVGAnimatedNumberList;
-    readonly type: SVGAnimatedEnumeration;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_DISCRETE: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_GAMMA: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_IDENTITY: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_LINEAR: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_TABLE: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGComponentTransferFunctionElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGComponentTransferFunctionElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGComponentTransferFunctionElement: {
-    prototype: SVGComponentTransferFunctionElement;
-    new(): SVGComponentTransferFunctionElement;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_DISCRETE: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_GAMMA: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_IDENTITY: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_LINEAR: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_TABLE: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_UNKNOWN: number;
-};
-
-interface SVGDefsElement extends SVGGraphicsElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGDefsElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGDefsElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGDefsElement: {
-    prototype: SVGDefsElement;
-    new(): SVGDefsElement;
-};
-
-interface SVGDescElement extends SVGElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGDescElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGDescElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGDescElement: {
-    prototype: SVGDescElement;
-    new(): SVGDescElement;
-};
-
-interface SVGElementEventMap extends ElementEventMap {
-    "click": MouseEvent;
-    "dblclick": MouseEvent;
-    "focusin": FocusEvent;
-    "focusout": FocusEvent;
-    "load": Event;
-    "mousedown": MouseEvent;
-    "mousemove": MouseEvent;
-    "mouseout": MouseEvent;
-    "mouseover": MouseEvent;
-    "mouseup": MouseEvent;
-}
-
-interface SVGElement extends Element, ElementCSSInlineStyle {
-    readonly className: any;
-    onclick: ((this: SVGElement, ev: MouseEvent) => any) | null;
-    ondblclick: ((this: SVGElement, ev: MouseEvent) => any) | null;
-    onfocusin: ((this: SVGElement, ev: FocusEvent) => any) | null;
-    onfocusout: ((this: SVGElement, ev: FocusEvent) => any) | null;
-    onload: ((this: SVGElement, ev: Event) => any) | null;
-    onmousedown: ((this: SVGElement, ev: MouseEvent) => any) | null;
-    onmousemove: ((this: SVGElement, ev: MouseEvent) => any) | null;
-    onmouseout: ((this: SVGElement, ev: MouseEvent) => any) | null;
-    onmouseover: ((this: SVGElement, ev: MouseEvent) => any) | null;
-    onmouseup: ((this: SVGElement, ev: MouseEvent) => any) | null;
-    readonly ownerSVGElement: SVGSVGElement | null;
-    readonly viewportElement: SVGElement | null;
-    /** @deprecated */
-    xmlbase: string;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGElement: {
-    prototype: SVGElement;
-    new(): SVGElement;
-};
-
-interface SVGElementInstance extends EventTarget {
-    readonly childNodes: SVGElementInstanceList;
-    readonly correspondingElement: SVGElement;
-    readonly correspondingUseElement: SVGUseElement;
-    readonly firstChild: SVGElementInstance;
-    readonly lastChild: SVGElementInstance;
-    readonly nextSibling: SVGElementInstance;
-    readonly parentNode: SVGElementInstance;
-    readonly previousSibling: SVGElementInstance;
-}
-
-declare var SVGElementInstance: {
-    prototype: SVGElementInstance;
-    new(): SVGElementInstance;
-};
-
-interface SVGElementInstanceList {
-    /** @deprecated */
-    readonly length: number;
-    /** @deprecated */
-    item(index: number): SVGElementInstance;
-}
-
-declare var SVGElementInstanceList: {
-    prototype: SVGElementInstanceList;
-    new(): SVGElementInstanceList;
-};
-
-interface SVGEllipseElement extends SVGGraphicsElement {
-    readonly cx: SVGAnimatedLength;
-    readonly cy: SVGAnimatedLength;
-    readonly rx: SVGAnimatedLength;
-    readonly ry: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGEllipseElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGEllipseElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGEllipseElement: {
-    prototype: SVGEllipseElement;
-    new(): SVGEllipseElement;
-};
-
-interface SVGFEBlendElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    readonly in2: SVGAnimatedString;
-    readonly mode: SVGAnimatedEnumeration;
-    readonly SVG_FEBLEND_MODE_COLOR: number;
-    readonly SVG_FEBLEND_MODE_COLOR_BURN: number;
-    readonly SVG_FEBLEND_MODE_COLOR_DODGE: number;
-    readonly SVG_FEBLEND_MODE_DARKEN: number;
-    readonly SVG_FEBLEND_MODE_DIFFERENCE: number;
-    readonly SVG_FEBLEND_MODE_EXCLUSION: number;
-    readonly SVG_FEBLEND_MODE_HARD_LIGHT: number;
-    readonly SVG_FEBLEND_MODE_HUE: number;
-    readonly SVG_FEBLEND_MODE_LIGHTEN: number;
-    readonly SVG_FEBLEND_MODE_LUMINOSITY: number;
-    readonly SVG_FEBLEND_MODE_MULTIPLY: number;
-    readonly SVG_FEBLEND_MODE_NORMAL: number;
-    readonly SVG_FEBLEND_MODE_OVERLAY: number;
-    readonly SVG_FEBLEND_MODE_SATURATION: number;
-    readonly SVG_FEBLEND_MODE_SCREEN: number;
-    readonly SVG_FEBLEND_MODE_SOFT_LIGHT: number;
-    readonly SVG_FEBLEND_MODE_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEBlendElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEBlendElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEBlendElement: {
-    prototype: SVGFEBlendElement;
-    new(): SVGFEBlendElement;
-    readonly SVG_FEBLEND_MODE_COLOR: number;
-    readonly SVG_FEBLEND_MODE_COLOR_BURN: number;
-    readonly SVG_FEBLEND_MODE_COLOR_DODGE: number;
-    readonly SVG_FEBLEND_MODE_DARKEN: number;
-    readonly SVG_FEBLEND_MODE_DIFFERENCE: number;
-    readonly SVG_FEBLEND_MODE_EXCLUSION: number;
-    readonly SVG_FEBLEND_MODE_HARD_LIGHT: number;
-    readonly SVG_FEBLEND_MODE_HUE: number;
-    readonly SVG_FEBLEND_MODE_LIGHTEN: number;
-    readonly SVG_FEBLEND_MODE_LUMINOSITY: number;
-    readonly SVG_FEBLEND_MODE_MULTIPLY: number;
-    readonly SVG_FEBLEND_MODE_NORMAL: number;
-    readonly SVG_FEBLEND_MODE_OVERLAY: number;
-    readonly SVG_FEBLEND_MODE_SATURATION: number;
-    readonly SVG_FEBLEND_MODE_SCREEN: number;
-    readonly SVG_FEBLEND_MODE_SOFT_LIGHT: number;
-    readonly SVG_FEBLEND_MODE_UNKNOWN: number;
-};
-
-interface SVGFEColorMatrixElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    readonly type: SVGAnimatedEnumeration;
-    readonly values: SVGAnimatedNumberList;
-    readonly SVG_FECOLORMATRIX_TYPE_HUEROTATE: number;
-    readonly SVG_FECOLORMATRIX_TYPE_LUMINANCETOALPHA: number;
-    readonly SVG_FECOLORMATRIX_TYPE_MATRIX: number;
-    readonly SVG_FECOLORMATRIX_TYPE_SATURATE: number;
-    readonly SVG_FECOLORMATRIX_TYPE_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEColorMatrixElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEColorMatrixElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEColorMatrixElement: {
-    prototype: SVGFEColorMatrixElement;
-    new(): SVGFEColorMatrixElement;
-    readonly SVG_FECOLORMATRIX_TYPE_HUEROTATE: number;
-    readonly SVG_FECOLORMATRIX_TYPE_LUMINANCETOALPHA: number;
-    readonly SVG_FECOLORMATRIX_TYPE_MATRIX: number;
-    readonly SVG_FECOLORMATRIX_TYPE_SATURATE: number;
-    readonly SVG_FECOLORMATRIX_TYPE_UNKNOWN: number;
-};
-
-interface SVGFEComponentTransferElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEComponentTransferElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEComponentTransferElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEComponentTransferElement: {
-    prototype: SVGFEComponentTransferElement;
-    new(): SVGFEComponentTransferElement;
-};
-
-interface SVGFECompositeElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    readonly in2: SVGAnimatedString;
-    readonly k1: SVGAnimatedNumber;
-    readonly k2: SVGAnimatedNumber;
-    readonly k3: SVGAnimatedNumber;
-    readonly k4: SVGAnimatedNumber;
-    readonly operator: SVGAnimatedEnumeration;
-    readonly SVG_FECOMPOSITE_OPERATOR_ARITHMETIC: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_ATOP: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_IN: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_OUT: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_OVER: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_UNKNOWN: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_XOR: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFECompositeElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFECompositeElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFECompositeElement: {
-    prototype: SVGFECompositeElement;
-    new(): SVGFECompositeElement;
-    readonly SVG_FECOMPOSITE_OPERATOR_ARITHMETIC: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_ATOP: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_IN: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_OUT: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_OVER: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_UNKNOWN: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_XOR: number;
-};
-
-interface SVGFEConvolveMatrixElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly bias: SVGAnimatedNumber;
-    readonly divisor: SVGAnimatedNumber;
-    readonly edgeMode: SVGAnimatedEnumeration;
-    readonly in1: SVGAnimatedString;
-    readonly kernelMatrix: SVGAnimatedNumberList;
-    readonly kernelUnitLengthX: SVGAnimatedNumber;
-    readonly kernelUnitLengthY: SVGAnimatedNumber;
-    readonly orderX: SVGAnimatedInteger;
-    readonly orderY: SVGAnimatedInteger;
-    readonly preserveAlpha: SVGAnimatedBoolean;
-    readonly targetX: SVGAnimatedInteger;
-    readonly targetY: SVGAnimatedInteger;
-    readonly SVG_EDGEMODE_DUPLICATE: number;
-    readonly SVG_EDGEMODE_NONE: number;
-    readonly SVG_EDGEMODE_UNKNOWN: number;
-    readonly SVG_EDGEMODE_WRAP: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEConvolveMatrixElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEConvolveMatrixElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEConvolveMatrixElement: {
-    prototype: SVGFEConvolveMatrixElement;
-    new(): SVGFEConvolveMatrixElement;
-    readonly SVG_EDGEMODE_DUPLICATE: number;
-    readonly SVG_EDGEMODE_NONE: number;
-    readonly SVG_EDGEMODE_UNKNOWN: number;
-    readonly SVG_EDGEMODE_WRAP: number;
-};
-
-interface SVGFEDiffuseLightingElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly diffuseConstant: SVGAnimatedNumber;
-    readonly in1: SVGAnimatedString;
-    readonly kernelUnitLengthX: SVGAnimatedNumber;
-    readonly kernelUnitLengthY: SVGAnimatedNumber;
-    readonly surfaceScale: SVGAnimatedNumber;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEDiffuseLightingElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEDiffuseLightingElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEDiffuseLightingElement: {
-    prototype: SVGFEDiffuseLightingElement;
-    new(): SVGFEDiffuseLightingElement;
-};
-
-interface SVGFEDisplacementMapElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    readonly in2: SVGAnimatedString;
-    readonly scale: SVGAnimatedNumber;
-    readonly xChannelSelector: SVGAnimatedEnumeration;
-    readonly yChannelSelector: SVGAnimatedEnumeration;
-    readonly SVG_CHANNEL_A: number;
-    readonly SVG_CHANNEL_B: number;
-    readonly SVG_CHANNEL_G: number;
-    readonly SVG_CHANNEL_R: number;
-    readonly SVG_CHANNEL_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEDisplacementMapElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEDisplacementMapElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEDisplacementMapElement: {
-    prototype: SVGFEDisplacementMapElement;
-    new(): SVGFEDisplacementMapElement;
-    readonly SVG_CHANNEL_A: number;
-    readonly SVG_CHANNEL_B: number;
-    readonly SVG_CHANNEL_G: number;
-    readonly SVG_CHANNEL_R: number;
-    readonly SVG_CHANNEL_UNKNOWN: number;
-};
-
-interface SVGFEDistantLightElement extends SVGElement {
-    readonly azimuth: SVGAnimatedNumber;
-    readonly elevation: SVGAnimatedNumber;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEDistantLightElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEDistantLightElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEDistantLightElement: {
-    prototype: SVGFEDistantLightElement;
-    new(): SVGFEDistantLightElement;
-};
-
-interface SVGFEFloodElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFloodElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFloodElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEFloodElement: {
-    prototype: SVGFEFloodElement;
-    new(): SVGFEFloodElement;
-};
-
-interface SVGFEFuncAElement extends SVGComponentTransferFunctionElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFuncAElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFuncAElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEFuncAElement: {
-    prototype: SVGFEFuncAElement;
-    new(): SVGFEFuncAElement;
-};
-
-interface SVGFEFuncBElement extends SVGComponentTransferFunctionElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFuncBElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFuncBElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEFuncBElement: {
-    prototype: SVGFEFuncBElement;
-    new(): SVGFEFuncBElement;
-};
-
-interface SVGFEFuncGElement extends SVGComponentTransferFunctionElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFuncGElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFuncGElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEFuncGElement: {
-    prototype: SVGFEFuncGElement;
-    new(): SVGFEFuncGElement;
-};
-
-interface SVGFEFuncRElement extends SVGComponentTransferFunctionElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFuncRElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFuncRElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEFuncRElement: {
-    prototype: SVGFEFuncRElement;
-    new(): SVGFEFuncRElement;
-};
-
-interface SVGFEGaussianBlurElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    readonly stdDeviationX: SVGAnimatedNumber;
-    readonly stdDeviationY: SVGAnimatedNumber;
-    setStdDeviation(stdDeviationX: number, stdDeviationY: number): void;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEGaussianBlurElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEGaussianBlurElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEGaussianBlurElement: {
-    prototype: SVGFEGaussianBlurElement;
-    new(): SVGFEGaussianBlurElement;
-};
-
-interface SVGFEImageElement extends SVGElement, SVGFilterPrimitiveStandardAttributes, SVGURIReference {
-    readonly preserveAspectRatio: SVGAnimatedPreserveAspectRatio;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEImageElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEImageElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEImageElement: {
-    prototype: SVGFEImageElement;
-    new(): SVGFEImageElement;
-};
-
-interface SVGFEMergeElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEMergeElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEMergeElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEMergeElement: {
-    prototype: SVGFEMergeElement;
-    new(): SVGFEMergeElement;
-};
-
-interface SVGFEMergeNodeElement extends SVGElement {
-    readonly in1: SVGAnimatedString;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEMergeNodeElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEMergeNodeElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEMergeNodeElement: {
-    prototype: SVGFEMergeNodeElement;
-    new(): SVGFEMergeNodeElement;
-};
-
-interface SVGFEMorphologyElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    readonly operator: SVGAnimatedEnumeration;
-    readonly radiusX: SVGAnimatedNumber;
-    readonly radiusY: SVGAnimatedNumber;
-    readonly SVG_MORPHOLOGY_OPERATOR_DILATE: number;
-    readonly SVG_MORPHOLOGY_OPERATOR_ERODE: number;
-    readonly SVG_MORPHOLOGY_OPERATOR_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEMorphologyElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEMorphologyElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEMorphologyElement: {
-    prototype: SVGFEMorphologyElement;
-    new(): SVGFEMorphologyElement;
-    readonly SVG_MORPHOLOGY_OPERATOR_DILATE: number;
-    readonly SVG_MORPHOLOGY_OPERATOR_ERODE: number;
-    readonly SVG_MORPHOLOGY_OPERATOR_UNKNOWN: number;
-};
-
-interface SVGFEOffsetElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly dx: SVGAnimatedNumber;
-    readonly dy: SVGAnimatedNumber;
-    readonly in1: SVGAnimatedString;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEOffsetElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEOffsetElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEOffsetElement: {
-    prototype: SVGFEOffsetElement;
-    new(): SVGFEOffsetElement;
-};
-
-interface SVGFEPointLightElement extends SVGElement {
-    readonly x: SVGAnimatedNumber;
-    readonly y: SVGAnimatedNumber;
-    readonly z: SVGAnimatedNumber;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEPointLightElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEPointLightElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEPointLightElement: {
-    prototype: SVGFEPointLightElement;
-    new(): SVGFEPointLightElement;
-};
-
-interface SVGFESpecularLightingElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    readonly kernelUnitLengthX: SVGAnimatedNumber;
-    readonly kernelUnitLengthY: SVGAnimatedNumber;
-    readonly specularConstant: SVGAnimatedNumber;
-    readonly specularExponent: SVGAnimatedNumber;
-    readonly surfaceScale: SVGAnimatedNumber;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFESpecularLightingElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFESpecularLightingElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFESpecularLightingElement: {
-    prototype: SVGFESpecularLightingElement;
-    new(): SVGFESpecularLightingElement;
-};
-
-interface SVGFESpotLightElement extends SVGElement {
-    readonly limitingConeAngle: SVGAnimatedNumber;
-    readonly pointsAtX: SVGAnimatedNumber;
-    readonly pointsAtY: SVGAnimatedNumber;
-    readonly pointsAtZ: SVGAnimatedNumber;
-    readonly specularExponent: SVGAnimatedNumber;
-    readonly x: SVGAnimatedNumber;
-    readonly y: SVGAnimatedNumber;
-    readonly z: SVGAnimatedNumber;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFESpotLightElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFESpotLightElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFESpotLightElement: {
-    prototype: SVGFESpotLightElement;
-    new(): SVGFESpotLightElement;
-};
-
-interface SVGFETileElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFETileElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFETileElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFETileElement: {
-    prototype: SVGFETileElement;
-    new(): SVGFETileElement;
-};
-
-interface SVGFETurbulenceElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly baseFrequencyX: SVGAnimatedNumber;
-    readonly baseFrequencyY: SVGAnimatedNumber;
-    readonly numOctaves: SVGAnimatedInteger;
-    readonly seed: SVGAnimatedNumber;
-    readonly stitchTiles: SVGAnimatedEnumeration;
-    readonly type: SVGAnimatedEnumeration;
-    readonly SVG_STITCHTYPE_NOSTITCH: number;
-    readonly SVG_STITCHTYPE_STITCH: number;
-    readonly SVG_STITCHTYPE_UNKNOWN: number;
-    readonly SVG_TURBULENCE_TYPE_FRACTALNOISE: number;
-    readonly SVG_TURBULENCE_TYPE_TURBULENCE: number;
-    readonly SVG_TURBULENCE_TYPE_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFETurbulenceElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFETurbulenceElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFETurbulenceElement: {
-    prototype: SVGFETurbulenceElement;
-    new(): SVGFETurbulenceElement;
-    readonly SVG_STITCHTYPE_NOSTITCH: number;
-    readonly SVG_STITCHTYPE_STITCH: number;
-    readonly SVG_STITCHTYPE_UNKNOWN: number;
-    readonly SVG_TURBULENCE_TYPE_FRACTALNOISE: number;
-    readonly SVG_TURBULENCE_TYPE_TURBULENCE: number;
-    readonly SVG_TURBULENCE_TYPE_UNKNOWN: number;
-};
-
-interface SVGFilterElement extends SVGElement, SVGUnitTypes, SVGURIReference {
-    /** @deprecated */
-    readonly filterResX: SVGAnimatedInteger;
-    /** @deprecated */
-    readonly filterResY: SVGAnimatedInteger;
-    readonly filterUnits: SVGAnimatedEnumeration;
-    readonly height: SVGAnimatedLength;
-    readonly primitiveUnits: SVGAnimatedEnumeration;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-    /** @deprecated */
-    setFilterRes(filterResX: number, filterResY: number): void;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFilterElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFilterElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFilterElement: {
-    prototype: SVGFilterElement;
-    new(): SVGFilterElement;
-};
-
-interface SVGFilterPrimitiveStandardAttributes {
-    readonly height: SVGAnimatedLength;
-    readonly result: SVGAnimatedString;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-}
-
-interface SVGFitToViewBox {
-    readonly preserveAspectRatio: SVGAnimatedPreserveAspectRatio;
-    readonly viewBox: SVGAnimatedRect;
-}
-
-interface SVGForeignObjectElement extends SVGGraphicsElement {
-    readonly height: SVGAnimatedLength;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGForeignObjectElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGForeignObjectElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGForeignObjectElement: {
-    prototype: SVGForeignObjectElement;
-    new(): SVGForeignObjectElement;
-};
-
-interface SVGGElement extends SVGGraphicsElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGGElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGGElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGGElement: {
-    prototype: SVGGElement;
-    new(): SVGGElement;
-};
-
-interface SVGGradientElement extends SVGElement, SVGUnitTypes, SVGURIReference {
-    readonly gradientTransform: SVGAnimatedTransformList;
-    readonly gradientUnits: SVGAnimatedEnumeration;
-    readonly spreadMethod: SVGAnimatedEnumeration;
-    readonly SVG_SPREADMETHOD_PAD: number;
-    readonly SVG_SPREADMETHOD_REFLECT: number;
-    readonly SVG_SPREADMETHOD_REPEAT: number;
-    readonly SVG_SPREADMETHOD_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGGradientElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGGradientElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGGradientElement: {
-    prototype: SVGGradientElement;
-    new(): SVGGradientElement;
-    readonly SVG_SPREADMETHOD_PAD: number;
-    readonly SVG_SPREADMETHOD_REFLECT: number;
-    readonly SVG_SPREADMETHOD_REPEAT: number;
-    readonly SVG_SPREADMETHOD_UNKNOWN: number;
-};
-
-interface SVGGraphicsElement extends SVGElement, SVGTests {
-    /** @deprecated */
-    readonly farthestViewportElement: SVGElement | null;
-    /** @deprecated */
-    readonly nearestViewportElement: SVGElement | null;
-    readonly transform: SVGAnimatedTransformList;
-    getBBox(): SVGRect;
-    getCTM(): SVGMatrix | null;
-    getScreenCTM(): SVGMatrix | null;
-    /** @deprecated */
-    getTransformToElement(element: SVGElement): SVGMatrix;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGGraphicsElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGGraphicsElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGGraphicsElement: {
-    prototype: SVGGraphicsElement;
-    new(): SVGGraphicsElement;
-};
-
-interface SVGImageElement extends SVGGraphicsElement, SVGURIReference {
-    readonly height: SVGAnimatedLength;
-    readonly preserveAspectRatio: SVGAnimatedPreserveAspectRatio;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGImageElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGImageElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGImageElement: {
-    prototype: SVGImageElement;
-    new(): SVGImageElement;
-};
-
-interface SVGLength {
-    readonly unitType: number;
-    value: number;
-    valueAsString: string;
-    valueInSpecifiedUnits: number;
-    convertToSpecifiedUnits(unitType: number): void;
-    newValueSpecifiedUnits(unitType: number, valueInSpecifiedUnits: number): void;
-    readonly SVG_LENGTHTYPE_CM: number;
-    readonly SVG_LENGTHTYPE_EMS: number;
-    readonly SVG_LENGTHTYPE_EXS: number;
-    readonly SVG_LENGTHTYPE_IN: number;
-    readonly SVG_LENGTHTYPE_MM: number;
-    readonly SVG_LENGTHTYPE_NUMBER: number;
-    readonly SVG_LENGTHTYPE_PC: number;
-    readonly SVG_LENGTHTYPE_PERCENTAGE: number;
-    readonly SVG_LENGTHTYPE_PT: number;
-    readonly SVG_LENGTHTYPE_PX: number;
-    readonly SVG_LENGTHTYPE_UNKNOWN: number;
-}
-
-declare var SVGLength: {
-    prototype: SVGLength;
-    new(): SVGLength;
-    readonly SVG_LENGTHTYPE_CM: number;
-    readonly SVG_LENGTHTYPE_EMS: number;
-    readonly SVG_LENGTHTYPE_EXS: number;
-    readonly SVG_LENGTHTYPE_IN: number;
-    readonly SVG_LENGTHTYPE_MM: number;
-    readonly SVG_LENGTHTYPE_NUMBER: number;
-    readonly SVG_LENGTHTYPE_PC: number;
-    readonly SVG_LENGTHTYPE_PERCENTAGE: number;
-    readonly SVG_LENGTHTYPE_PT: number;
-    readonly SVG_LENGTHTYPE_PX: number;
-    readonly SVG_LENGTHTYPE_UNKNOWN: number;
-};
-
-interface SVGLengthList {
-    readonly numberOfItems: number;
-    appendItem(newItem: SVGLength): SVGLength;
-    clear(): void;
-    getItem(index: number): SVGLength;
-    initialize(newItem: SVGLength): SVGLength;
-    insertItemBefore(newItem: SVGLength, index: number): SVGLength;
-    removeItem(index: number): SVGLength;
-    replaceItem(newItem: SVGLength, index: number): SVGLength;
-}
-
-declare var SVGLengthList: {
-    prototype: SVGLengthList;
-    new(): SVGLengthList;
-};
-
-interface SVGLineElement extends SVGGraphicsElement {
-    readonly x1: SVGAnimatedLength;
-    readonly x2: SVGAnimatedLength;
-    readonly y1: SVGAnimatedLength;
-    readonly y2: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGLineElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGLineElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGLineElement: {
-    prototype: SVGLineElement;
-    new(): SVGLineElement;
-};
-
-interface SVGLinearGradientElement extends SVGGradientElement {
-    readonly x1: SVGAnimatedLength;
-    readonly x2: SVGAnimatedLength;
-    readonly y1: SVGAnimatedLength;
-    readonly y2: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGLinearGradientElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGLinearGradientElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGLinearGradientElement: {
-    prototype: SVGLinearGradientElement;
-    new(): SVGLinearGradientElement;
-};
-
-interface SVGMarkerElement extends SVGElement, SVGFitToViewBox {
-    readonly markerHeight: SVGAnimatedLength;
-    readonly markerUnits: SVGAnimatedEnumeration;
-    readonly markerWidth: SVGAnimatedLength;
-    readonly orientAngle: SVGAnimatedAngle;
-    readonly orientType: SVGAnimatedEnumeration;
-    readonly refX: SVGAnimatedLength;
-    readonly refY: SVGAnimatedLength;
-    setOrientToAngle(angle: SVGAngle): void;
-    setOrientToAuto(): void;
-    readonly SVG_MARKERUNITS_STROKEWIDTH: number;
-    readonly SVG_MARKERUNITS_UNKNOWN: number;
-    readonly SVG_MARKERUNITS_USERSPACEONUSE: number;
-    readonly SVG_MARKER_ORIENT_ANGLE: number;
-    readonly SVG_MARKER_ORIENT_AUTO: number;
-    readonly SVG_MARKER_ORIENT_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGMarkerElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGMarkerElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGMarkerElement: {
-    prototype: SVGMarkerElement;
-    new(): SVGMarkerElement;
-    readonly SVG_MARKERUNITS_STROKEWIDTH: number;
-    readonly SVG_MARKERUNITS_UNKNOWN: number;
-    readonly SVG_MARKERUNITS_USERSPACEONUSE: number;
-    readonly SVG_MARKER_ORIENT_ANGLE: number;
-    readonly SVG_MARKER_ORIENT_AUTO: number;
-    readonly SVG_MARKER_ORIENT_UNKNOWN: number;
-};
-
-interface SVGMaskElement extends SVGElement, SVGTests, SVGUnitTypes {
-    readonly height: SVGAnimatedLength;
-    readonly maskContentUnits: SVGAnimatedEnumeration;
-    readonly maskUnits: SVGAnimatedEnumeration;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGMaskElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGMaskElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGMaskElement: {
-    prototype: SVGMaskElement;
-    new(): SVGMaskElement;
-};
-
-interface SVGMatrix {
-    a: number;
-    b: number;
-    c: number;
-    d: number;
-    e: number;
-    f: number;
-    flipX(): SVGMatrix;
-    flipY(): SVGMatrix;
-    inverse(): SVGMatrix;
-    multiply(secondMatrix: SVGMatrix): SVGMatrix;
-    rotate(angle: number): SVGMatrix;
-    rotateFromVector(x: number, y: number): SVGMatrix;
-    scale(scaleFactor: number): SVGMatrix;
-    scaleNonUniform(scaleFactorX: number, scaleFactorY: number): SVGMatrix;
-    skewX(angle: number): SVGMatrix;
-    skewY(angle: number): SVGMatrix;
-    translate(x: number, y: number): SVGMatrix;
-}
-
-declare var SVGMatrix: {
-    prototype: SVGMatrix;
-    new(): SVGMatrix;
-};
-
-interface SVGMetadataElement extends SVGElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGMetadataElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGMetadataElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGMetadataElement: {
-    prototype: SVGMetadataElement;
-    new(): SVGMetadataElement;
-};
-
-interface SVGNumber {
-    value: number;
-}
-
-declare var SVGNumber: {
-    prototype: SVGNumber;
-    new(): SVGNumber;
-};
-
-interface SVGNumberList {
-    readonly numberOfItems: number;
-    appendItem(newItem: SVGNumber): SVGNumber;
-    clear(): void;
-    getItem(index: number): SVGNumber;
-    initialize(newItem: SVGNumber): SVGNumber;
-    insertItemBefore(newItem: SVGNumber, index: number): SVGNumber;
-    removeItem(index: number): SVGNumber;
-    replaceItem(newItem: SVGNumber, index: number): SVGNumber;
-}
-
-declare var SVGNumberList: {
-    prototype: SVGNumberList;
-    new(): SVGNumberList;
-};
-
-interface SVGPathElement extends SVGGraphicsElement {
-    /** @deprecated */
-    readonly pathSegList: SVGPathSegList;
-    /** @deprecated */
-    createSVGPathSegArcAbs(x: number, y: number, r1: number, r2: number, angle: number, largeArcFlag: boolean, sweepFlag: boolean): SVGPathSegArcAbs;
-    /** @deprecated */
-    createSVGPathSegArcRel(x: number, y: number, r1: number, r2: number, angle: number, largeArcFlag: boolean, sweepFlag: boolean): SVGPathSegArcRel;
-    /** @deprecated */
-    createSVGPathSegClosePath(): SVGPathSegClosePath;
-    /** @deprecated */
-    createSVGPathSegCurvetoCubicAbs(x: number, y: number, x1: number, y1: number, x2: number, y2: number): SVGPathSegCurvetoCubicAbs;
-    /** @deprecated */
-    createSVGPathSegCurvetoCubicRel(x: number, y: number, x1: number, y1: number, x2: number, y2: number): SVGPathSegCurvetoCubicRel;
-    /** @deprecated */
-    createSVGPathSegCurvetoCubicSmoothAbs(x: number, y: number, x2: number, y2: number): SVGPathSegCurvetoCubicSmoothAbs;
-    /** @deprecated */
-    createSVGPathSegCurvetoCubicSmoothRel(x: number, y: number, x2: number, y2: number): SVGPathSegCurvetoCubicSmoothRel;
-    /** @deprecated */
-    createSVGPathSegCurvetoQuadraticAbs(x: number, y: number, x1: number, y1: number): SVGPathSegCurvetoQuadraticAbs;
-    /** @deprecated */
-    createSVGPathSegCurvetoQuadraticRel(x: number, y: number, x1: number, y1: number): SVGPathSegCurvetoQuadraticRel;
-    /** @deprecated */
-    createSVGPathSegCurvetoQuadraticSmoothAbs(x: number, y: number): SVGPathSegCurvetoQuadraticSmoothAbs;
-    /** @deprecated */
-    createSVGPathSegCurvetoQuadraticSmoothRel(x: number, y: number): SVGPathSegCurvetoQuadraticSmoothRel;
-    /** @deprecated */
-    createSVGPathSegLinetoAbs(x: number, y: number): SVGPathSegLinetoAbs;
-    /** @deprecated */
-    createSVGPathSegLinetoHorizontalAbs(x: number): SVGPathSegLinetoHorizontalAbs;
-    /** @deprecated */
-    createSVGPathSegLinetoHorizontalRel(x: number): SVGPathSegLinetoHorizontalRel;
-    /** @deprecated */
-    createSVGPathSegLinetoRel(x: number, y: number): SVGPathSegLinetoRel;
-    /** @deprecated */
-    createSVGPathSegLinetoVerticalAbs(y: number): SVGPathSegLinetoVerticalAbs;
-    /** @deprecated */
-    createSVGPathSegLinetoVerticalRel(y: number): SVGPathSegLinetoVerticalRel;
-    /** @deprecated */
-    createSVGPathSegMovetoAbs(x: number, y: number): SVGPathSegMovetoAbs;
-    /** @deprecated */
-    createSVGPathSegMovetoRel(x: number, y: number): SVGPathSegMovetoRel;
-    /** @deprecated */
-    getPathSegAtLength(distance: number): number;
-    getPointAtLength(distance: number): SVGPoint;
-    getTotalLength(): number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGPathElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGPathElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGPathElement: {
-    prototype: SVGPathElement;
-    new(): SVGPathElement;
-};
-
-interface SVGPathSeg {
-    readonly pathSegType: number;
-    readonly pathSegTypeAsLetter: string;
-    readonly PATHSEG_ARC_ABS: number;
-    readonly PATHSEG_ARC_REL: number;
-    readonly PATHSEG_CLOSEPATH: number;
-    readonly PATHSEG_CURVETO_CUBIC_ABS: number;
-    readonly PATHSEG_CURVETO_CUBIC_REL: number;
-    readonly PATHSEG_CURVETO_CUBIC_SMOOTH_ABS: number;
-    readonly PATHSEG_CURVETO_CUBIC_SMOOTH_REL: number;
-    readonly PATHSEG_CURVETO_QUADRATIC_ABS: number;
-    readonly PATHSEG_CURVETO_QUADRATIC_REL: number;
-    readonly PATHSEG_CURVETO_QUADRATIC_SMOOTH_ABS: number;
-    readonly PATHSEG_CURVETO_QUADRATIC_SMOOTH_REL: number;
-    readonly PATHSEG_LINETO_ABS: number;
-    readonly PATHSEG_LINETO_HORIZONTAL_ABS: number;
-    readonly PATHSEG_LINETO_HORIZONTAL_REL: number;
-    readonly PATHSEG_LINETO_REL: number;
-    readonly PATHSEG_LINETO_VERTICAL_ABS: number;
-    readonly PATHSEG_LINETO_VERTICAL_REL: number;
-    readonly PATHSEG_MOVETO_ABS: number;
-    readonly PATHSEG_MOVETO_REL: number;
-    readonly PATHSEG_UNKNOWN: number;
-}
-
-declare var SVGPathSeg: {
-    prototype: SVGPathSeg;
-    new(): SVGPathSeg;
-    readonly PATHSEG_ARC_ABS: number;
-    readonly PATHSEG_ARC_REL: number;
-    readonly PATHSEG_CLOSEPATH: number;
-    readonly PATHSEG_CURVETO_CUBIC_ABS: number;
-    readonly PATHSEG_CURVETO_CUBIC_REL: number;
-    readonly PATHSEG_CURVETO_CUBIC_SMOOTH_ABS: number;
-    readonly PATHSEG_CURVETO_CUBIC_SMOOTH_REL: number;
-    readonly PATHSEG_CURVETO_QUADRATIC_ABS: number;
-    readonly PATHSEG_CURVETO_QUADRATIC_REL: number;
-    readonly PATHSEG_CURVETO_QUADRATIC_SMOOTH_ABS: number;
-    readonly PATHSEG_CURVETO_QUADRATIC_SMOOTH_REL: number;
-    readonly PATHSEG_LINETO_ABS: number;
-    readonly PATHSEG_LINETO_HORIZONTAL_ABS: number;
-    readonly PATHSEG_LINETO_HORIZONTAL_REL: number;
-    readonly PATHSEG_LINETO_REL: number;
-    readonly PATHSEG_LINETO_VERTICAL_ABS: number;
-    readonly PATHSEG_LINETO_VERTICAL_REL: number;
-    readonly PATHSEG_MOVETO_ABS: number;
-    readonly PATHSEG_MOVETO_REL: number;
-    readonly PATHSEG_UNKNOWN: number;
-};
-
-interface SVGPathSegArcAbs extends SVGPathSeg {
-    angle: number;
-    largeArcFlag: boolean;
-    r1: number;
-    r2: number;
-    sweepFlag: boolean;
-    x: number;
-    y: number;
-}
-
-declare var SVGPathSegArcAbs: {
-    prototype: SVGPathSegArcAbs;
-    new(): SVGPathSegArcAbs;
-};
-
-interface SVGPathSegArcRel extends SVGPathSeg {
-    angle: number;
-    largeArcFlag: boolean;
-    r1: number;
-    r2: number;
-    sweepFlag: boolean;
-    x: number;
-    y: number;
-}
-
-declare var SVGPathSegArcRel: {
-    prototype: SVGPathSegArcRel;
-    new(): SVGPathSegArcRel;
-};
-
-interface SVGPathSegClosePath extends SVGPathSeg {
-}
-
-declare var SVGPathSegClosePath: {
-    prototype: SVGPathSegClosePath;
-    new(): SVGPathSegClosePath;
-};
-
-interface SVGPathSegCurvetoCubicAbs extends SVGPathSeg {
-    x: number;
-    x1: number;
-    x2: number;
-    y: number;
-    y1: number;
-    y2: number;
-}
-
-declare var SVGPathSegCurvetoCubicAbs: {
-    prototype: SVGPathSegCurvetoCubicAbs;
-    new(): SVGPathSegCurvetoCubicAbs;
-};
-
-interface SVGPathSegCurvetoCubicRel extends SVGPathSeg {
-    x: number;
-    x1: number;
-    x2: number;
-    y: number;
-    y1: number;
-    y2: number;
-}
-
-declare var SVGPathSegCurvetoCubicRel: {
-    prototype: SVGPathSegCurvetoCubicRel;
-    new(): SVGPathSegCurvetoCubicRel;
-};
-
-interface SVGPathSegCurvetoCubicSmoothAbs extends SVGPathSeg {
-    x: number;
-    x2: number;
-    y: number;
-    y2: number;
-}
-
-declare var SVGPathSegCurvetoCubicSmoothAbs: {
-    prototype: SVGPathSegCurvetoCubicSmoothAbs;
-    new(): SVGPathSegCurvetoCubicSmoothAbs;
-};
-
-interface SVGPathSegCurvetoCubicSmoothRel extends SVGPathSeg {
-    x: number;
-    x2: number;
-    y: number;
-    y2: number;
-}
-
-declare var SVGPathSegCurvetoCubicSmoothRel: {
-    prototype: SVGPathSegCurvetoCubicSmoothRel;
-    new(): SVGPathSegCurvetoCubicSmoothRel;
-};
-
-interface SVGPathSegCurvetoQuadraticAbs extends SVGPathSeg {
-    x: number;
-    x1: number;
-    y: number;
-    y1: number;
-}
-
-declare var SVGPathSegCurvetoQuadraticAbs: {
-    prototype: SVGPathSegCurvetoQuadraticAbs;
-    new(): SVGPathSegCurvetoQuadraticAbs;
-};
-
-interface SVGPathSegCurvetoQuadraticRel extends SVGPathSeg {
-    x: number;
-    x1: number;
-    y: number;
-    y1: number;
-}
-
-declare var SVGPathSegCurvetoQuadraticRel: {
-    prototype: SVGPathSegCurvetoQuadraticRel;
-    new(): SVGPathSegCurvetoQuadraticRel;
-};
-
-interface SVGPathSegCurvetoQuadraticSmoothAbs extends SVGPathSeg {
-    x: number;
-    y: number;
-}
-
-declare var SVGPathSegCurvetoQuadraticSmoothAbs: {
-    prototype: SVGPathSegCurvetoQuadraticSmoothAbs;
-    new(): SVGPathSegCurvetoQuadraticSmoothAbs;
-};
-
-interface SVGPathSegCurvetoQuadraticSmoothRel extends SVGPathSeg {
-    x: number;
-    y: number;
-}
-
-declare var SVGPathSegCurvetoQuadraticSmoothRel: {
-    prototype: SVGPathSegCurvetoQuadraticSmoothRel;
-    new(): SVGPathSegCurvetoQuadraticSmoothRel;
-};
-
-interface SVGPathSegLinetoAbs extends SVGPathSeg {
-    x: number;
-    y: number;
-}
-
-declare var SVGPathSegLinetoAbs: {
-    prototype: SVGPathSegLinetoAbs;
-    new(): SVGPathSegLinetoAbs;
-};
-
-interface SVGPathSegLinetoHorizontalAbs extends SVGPathSeg {
-    x: number;
-}
-
-declare var SVGPathSegLinetoHorizontalAbs: {
-    prototype: SVGPathSegLinetoHorizontalAbs;
-    new(): SVGPathSegLinetoHorizontalAbs;
-};
-
-interface SVGPathSegLinetoHorizontalRel extends SVGPathSeg {
-    x: number;
-}
-
-declare var SVGPathSegLinetoHorizontalRel: {
-    prototype: SVGPathSegLinetoHorizontalRel;
-    new(): SVGPathSegLinetoHorizontalRel;
-};
-
-interface SVGPathSegLinetoRel extends SVGPathSeg {
-    x: number;
-    y: number;
-}
-
-declare var SVGPathSegLinetoRel: {
-    prototype: SVGPathSegLinetoRel;
-    new(): SVGPathSegLinetoRel;
-};
-
-interface SVGPathSegLinetoVerticalAbs extends SVGPathSeg {
-    y: number;
-}
-
-declare var SVGPathSegLinetoVerticalAbs: {
-    prototype: SVGPathSegLinetoVerticalAbs;
-    new(): SVGPathSegLinetoVerticalAbs;
-};
-
-interface SVGPathSegLinetoVerticalRel extends SVGPathSeg {
-    y: number;
-}
-
-declare var SVGPathSegLinetoVerticalRel: {
-    prototype: SVGPathSegLinetoVerticalRel;
-    new(): SVGPathSegLinetoVerticalRel;
-};
-
-interface SVGPathSegList {
-    readonly numberOfItems: number;
-    appendItem(newItem: SVGPathSeg): SVGPathSeg;
-    clear(): void;
-    getItem(index: number): SVGPathSeg;
-    initialize(newItem: SVGPathSeg): SVGPathSeg;
-    insertItemBefore(newItem: SVGPathSeg, index: number): SVGPathSeg;
-    removeItem(index: number): SVGPathSeg;
-    replaceItem(newItem: SVGPathSeg, index: number): SVGPathSeg;
-}
-
-declare var SVGPathSegList: {
-    prototype: SVGPathSegList;
-    new(): SVGPathSegList;
-};
-
-interface SVGPathSegMovetoAbs extends SVGPathSeg {
-    x: number;
-    y: number;
-}
-
-declare var SVGPathSegMovetoAbs: {
-    prototype: SVGPathSegMovetoAbs;
-    new(): SVGPathSegMovetoAbs;
-};
-
-interface SVGPathSegMovetoRel extends SVGPathSeg {
-    x: number;
-    y: number;
-}
-
-declare var SVGPathSegMovetoRel: {
-    prototype: SVGPathSegMovetoRel;
-    new(): SVGPathSegMovetoRel;
-};
-
-interface SVGPatternElement extends SVGElement, SVGTests, SVGUnitTypes, SVGFitToViewBox, SVGURIReference {
-    readonly height: SVGAnimatedLength;
-    readonly patternContentUnits: SVGAnimatedEnumeration;
-    readonly patternTransform: SVGAnimatedTransformList;
-    readonly patternUnits: SVGAnimatedEnumeration;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGPatternElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGPatternElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGPatternElement: {
-    prototype: SVGPatternElement;
-    new(): SVGPatternElement;
-};
-
-interface SVGPoint {
-    x: number;
-    y: number;
-    matrixTransform(matrix: SVGMatrix): SVGPoint;
-}
-
-declare var SVGPoint: {
-    prototype: SVGPoint;
-    new(): SVGPoint;
-};
-
-interface SVGPointList {
-    readonly numberOfItems: number;
-    appendItem(newItem: SVGPoint): SVGPoint;
-    clear(): void;
-    getItem(index: number): SVGPoint;
-    initialize(newItem: SVGPoint): SVGPoint;
-    insertItemBefore(newItem: SVGPoint, index: number): SVGPoint;
-    removeItem(index: number): SVGPoint;
-    replaceItem(newItem: SVGPoint, index: number): SVGPoint;
-}
-
-declare var SVGPointList: {
-    prototype: SVGPointList;
-    new(): SVGPointList;
-};
-
-interface SVGPolygonElement extends SVGGraphicsElement, SVGAnimatedPoints {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGPolygonElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGPolygonElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGPolygonElement: {
-    prototype: SVGPolygonElement;
-    new(): SVGPolygonElement;
-};
-
-interface SVGPolylineElement extends SVGGraphicsElement, SVGAnimatedPoints {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGPolylineElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGPolylineElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGPolylineElement: {
-    prototype: SVGPolylineElement;
-    new(): SVGPolylineElement;
-};
-
-interface SVGPreserveAspectRatio {
-    align: number;
-    meetOrSlice: number;
-    readonly SVG_MEETORSLICE_MEET: number;
-    readonly SVG_MEETORSLICE_SLICE: number;
-    readonly SVG_MEETORSLICE_UNKNOWN: number;
-    readonly SVG_PRESERVEASPECTRATIO_NONE: number;
-    readonly SVG_PRESERVEASPECTRATIO_UNKNOWN: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMAXYMAX: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMAXYMID: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMAXYMIN: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMIDYMAX: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMIDYMID: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMIDYMIN: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMINYMAX: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMINYMID: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMINYMIN: number;
-}
-
-declare var SVGPreserveAspectRatio: {
-    prototype: SVGPreserveAspectRatio;
-    new(): SVGPreserveAspectRatio;
-    readonly SVG_MEETORSLICE_MEET: number;
-    readonly SVG_MEETORSLICE_SLICE: number;
-    readonly SVG_MEETORSLICE_UNKNOWN: number;
-    readonly SVG_PRESERVEASPECTRATIO_NONE: number;
-    readonly SVG_PRESERVEASPECTRATIO_UNKNOWN: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMAXYMAX: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMAXYMID: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMAXYMIN: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMIDYMAX: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMIDYMID: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMIDYMIN: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMINYMAX: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMINYMID: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMINYMIN: number;
-};
-
-interface SVGRadialGradientElement extends SVGGradientElement {
-    readonly cx: SVGAnimatedLength;
-    readonly cy: SVGAnimatedLength;
-    readonly fx: SVGAnimatedLength;
-    readonly fy: SVGAnimatedLength;
-    readonly r: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGRadialGradientElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGRadialGradientElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGRadialGradientElement: {
-    prototype: SVGRadialGradientElement;
-    new(): SVGRadialGradientElement;
-};
-
-interface SVGRect {
-    height: number;
-    width: number;
-    x: number;
-    y: number;
-}
-
-declare var SVGRect: {
-    prototype: SVGRect;
-    new(): SVGRect;
-};
-
-interface SVGRectElement extends SVGGraphicsElement {
-    readonly height: SVGAnimatedLength;
-    readonly rx: SVGAnimatedLength;
-    readonly ry: SVGAnimatedLength;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGRectElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGRectElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGRectElement: {
-    prototype: SVGRectElement;
-    new(): SVGRectElement;
-};
-
-interface SVGSVGElementEventMap extends SVGElementEventMap {
-    "SVGAbort": Event;
-    "SVGError": Event;
-    "resize": UIEvent;
-    "scroll": UIEvent;
-    "SVGUnload": Event;
-    "SVGZoom": SVGZoomEvent;
-}
-
-interface SVGSVGElement extends SVGGraphicsElement, DocumentEvent, SVGFitToViewBox, SVGZoomAndPan {
-    /** @deprecated */
-    contentScriptType: string;
-    /** @deprecated */
-    contentStyleType: string;
-    currentScale: number;
-    readonly currentTranslate: SVGPoint;
-    readonly height: SVGAnimatedLength;
-    onabort: ((this: SVGSVGElement, ev: Event) => any) | null;
-    onerror: ((this: SVGSVGElement, ev: Event) => any) | null;
-    onresize: ((this: SVGSVGElement, ev: UIEvent) => any) | null;
-    onscroll: ((this: SVGSVGElement, ev: UIEvent) => any) | null;
-    onunload: ((this: SVGSVGElement, ev: Event) => any) | null;
-    onzoom: ((this: SVGSVGElement, ev: SVGZoomEvent) => any) | null;
-    /** @deprecated */
-    readonly pixelUnitToMillimeterX: number;
-    /** @deprecated */
-    readonly pixelUnitToMillimeterY: number;
-    /** @deprecated */
-    readonly screenPixelToMillimeterX: number;
-    /** @deprecated */
-    readonly screenPixelToMillimeterY: number;
-    /** @deprecated */
-    readonly viewport: SVGRect;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-    checkEnclosure(element: SVGElement, rect: SVGRect): boolean;
-    checkIntersection(element: SVGElement, rect: SVGRect): boolean;
-    createSVGAngle(): SVGAngle;
-    createSVGLength(): SVGLength;
-    createSVGMatrix(): SVGMatrix;
-    createSVGNumber(): SVGNumber;
-    createSVGPoint(): SVGPoint;
-    createSVGRect(): SVGRect;
-    createSVGTransform(): SVGTransform;
-    createSVGTransformFromMatrix(matrix: SVGMatrix): SVGTransform;
-    deselectAll(): void;
-    /** @deprecated */
-    forceRedraw(): void;
-    getComputedStyle(elt: Element, pseudoElt?: string | null): CSSStyleDeclaration;
-    /** @deprecated */
-    getCurrentTime(): number;
-    getElementById(elementId: string): Element;
-    getEnclosureList(rect: SVGRect, referenceElement: SVGElement): NodeListOf<SVGCircleElement | SVGEllipseElement | SVGImageElement | SVGLineElement | SVGPathElement | SVGPolygonElement | SVGPolylineElement | SVGRectElement | SVGTextElement | SVGUseElement>;
-    getIntersectionList(rect: SVGRect, referenceElement: SVGElement): NodeListOf<SVGCircleElement | SVGEllipseElement | SVGImageElement | SVGLineElement | SVGPathElement | SVGPolygonElement | SVGPolylineElement | SVGRectElement | SVGTextElement | SVGUseElement>;
-    /** @deprecated */
-    pauseAnimations(): void;
-    /** @deprecated */
-    setCurrentTime(seconds: number): void;
-    /** @deprecated */
-    suspendRedraw(maxWaitMilliseconds: number): number;
-    /** @deprecated */
-    unpauseAnimations(): void;
-    /** @deprecated */
-    unsuspendRedraw(suspendHandleID: number): void;
-    /** @deprecated */
-    unsuspendRedrawAll(): void;
-    addEventListener<K extends keyof SVGSVGElementEventMap>(type: K, listener: (this: SVGSVGElement, ev: SVGSVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGSVGElementEventMap>(type: K, listener: (this: SVGSVGElement, ev: SVGSVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGSVGElement: {
-    prototype: SVGSVGElement;
-    new(): SVGSVGElement;
-};
-
-interface SVGScriptElement extends SVGElement, SVGURIReference {
-    type: string;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGScriptElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGScriptElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGScriptElement: {
-    prototype: SVGScriptElement;
-    new(): SVGScriptElement;
-};
-
-interface SVGStopElement extends SVGElement {
-    readonly offset: SVGAnimatedNumber;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGStopElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGStopElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGStopElement: {
-    prototype: SVGStopElement;
-    new(): SVGStopElement;
-};
-
-interface SVGStringList {
-    readonly numberOfItems: number;
-    appendItem(newItem: string): string;
-    clear(): void;
-    getItem(index: number): string;
-    initialize(newItem: string): string;
-    insertItemBefore(newItem: string, index: number): string;
-    removeItem(index: number): string;
-    replaceItem(newItem: string, index: number): string;
-}
-
-declare var SVGStringList: {
-    prototype: SVGStringList;
-    new(): SVGStringList;
-};
-
-interface SVGStylable {
-    className: any;
-}
-
-declare var SVGStylable: {
-    prototype: SVGStylable;
-    new(): SVGStylable;
-};
-
-interface SVGStyleElement extends SVGElement {
-    disabled: boolean;
-    media: string;
-    title: string;
-    type: string;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGStyleElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGStyleElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGStyleElement: {
-    prototype: SVGStyleElement;
-    new(): SVGStyleElement;
-};
-
-interface SVGSwitchElement extends SVGGraphicsElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGSwitchElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGSwitchElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGSwitchElement: {
-    prototype: SVGSwitchElement;
-    new(): SVGSwitchElement;
-};
-
-interface SVGSymbolElement extends SVGElement, SVGFitToViewBox {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGSymbolElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGSymbolElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGSymbolElement: {
-    prototype: SVGSymbolElement;
-    new(): SVGSymbolElement;
-};
-
-interface SVGTSpanElement extends SVGTextPositioningElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTSpanElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTSpanElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGTSpanElement: {
-    prototype: SVGTSpanElement;
-    new(): SVGTSpanElement;
-};
-
-interface SVGTests {
-    readonly requiredExtensions: SVGStringList;
-    /** @deprecated */
-    readonly requiredFeatures: SVGStringList;
-    readonly systemLanguage: SVGStringList;
-    /** @deprecated */
-    hasExtension(extension: string): boolean;
-}
-
-interface SVGTextContentElement extends SVGGraphicsElement {
-    readonly lengthAdjust: SVGAnimatedEnumeration;
-    readonly textLength: SVGAnimatedLength;
-    getCharNumAtPosition(point: SVGPoint): number;
-    getComputedTextLength(): number;
-    getEndPositionOfChar(charnum: number): SVGPoint;
-    getExtentOfChar(charnum: number): SVGRect;
-    getNumberOfChars(): number;
-    getRotationOfChar(charnum: number): number;
-    getStartPositionOfChar(charnum: number): SVGPoint;
-    getSubStringLength(charnum: number, nchars: number): number;
-    selectSubString(charnum: number, nchars: number): void;
-    readonly LENGTHADJUST_SPACING: number;
-    readonly LENGTHADJUST_SPACINGANDGLYPHS: number;
-    readonly LENGTHADJUST_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTextContentElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTextContentElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGTextContentElement: {
-    prototype: SVGTextContentElement;
-    new(): SVGTextContentElement;
-    readonly LENGTHADJUST_SPACING: number;
-    readonly LENGTHADJUST_SPACINGANDGLYPHS: number;
-    readonly LENGTHADJUST_UNKNOWN: number;
-};
-
-interface SVGTextElement extends SVGTextPositioningElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTextElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTextElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGTextElement: {
-    prototype: SVGTextElement;
-    new(): SVGTextElement;
-};
-
-interface SVGTextPathElement extends SVGTextContentElement, SVGURIReference {
-    readonly method: SVGAnimatedEnumeration;
-    readonly spacing: SVGAnimatedEnumeration;
-    readonly startOffset: SVGAnimatedLength;
-    readonly TEXTPATH_METHODTYPE_ALIGN: number;
-    readonly TEXTPATH_METHODTYPE_STRETCH: number;
-    readonly TEXTPATH_METHODTYPE_UNKNOWN: number;
-    readonly TEXTPATH_SPACINGTYPE_AUTO: number;
-    readonly TEXTPATH_SPACINGTYPE_EXACT: number;
-    readonly TEXTPATH_SPACINGTYPE_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTextPathElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTextPathElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGTextPathElement: {
-    prototype: SVGTextPathElement;
-    new(): SVGTextPathElement;
-    readonly TEXTPATH_METHODTYPE_ALIGN: number;
-    readonly TEXTPATH_METHODTYPE_STRETCH: number;
-    readonly TEXTPATH_METHODTYPE_UNKNOWN: number;
-    readonly TEXTPATH_SPACINGTYPE_AUTO: number;
-    readonly TEXTPATH_SPACINGTYPE_EXACT: number;
-    readonly TEXTPATH_SPACINGTYPE_UNKNOWN: number;
-};
-
-interface SVGTextPositioningElement extends SVGTextContentElement {
-    readonly dx: SVGAnimatedLengthList;
-    readonly dy: SVGAnimatedLengthList;
-    readonly rotate: SVGAnimatedNumberList;
-    readonly x: SVGAnimatedLengthList;
-    readonly y: SVGAnimatedLengthList;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTextPositioningElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTextPositioningElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGTextPositioningElement: {
-    prototype: SVGTextPositioningElement;
-    new(): SVGTextPositioningElement;
-};
-
-interface SVGTitleElement extends SVGElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTitleElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTitleElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGTitleElement: {
-    prototype: SVGTitleElement;
-    new(): SVGTitleElement;
-};
-
-interface SVGTransform {
-    readonly angle: number;
-    readonly matrix: SVGMatrix;
-    readonly type: number;
-    setMatrix(matrix: SVGMatrix): void;
-    setRotate(angle: number, cx: number, cy: number): void;
-    setScale(sx: number, sy: number): void;
-    setSkewX(angle: number): void;
-    setSkewY(angle: number): void;
-    setTranslate(tx: number, ty: number): void;
-    readonly SVG_TRANSFORM_MATRIX: number;
-    readonly SVG_TRANSFORM_ROTATE: number;
-    readonly SVG_TRANSFORM_SCALE: number;
-    readonly SVG_TRANSFORM_SKEWX: number;
-    readonly SVG_TRANSFORM_SKEWY: number;
-    readonly SVG_TRANSFORM_TRANSLATE: number;
-    readonly SVG_TRANSFORM_UNKNOWN: number;
-}
-
-declare var SVGTransform: {
-    prototype: SVGTransform;
-    new(): SVGTransform;
-    readonly SVG_TRANSFORM_MATRIX: number;
-    readonly SVG_TRANSFORM_ROTATE: number;
-    readonly SVG_TRANSFORM_SCALE: number;
-    readonly SVG_TRANSFORM_SKEWX: number;
-    readonly SVG_TRANSFORM_SKEWY: number;
-    readonly SVG_TRANSFORM_TRANSLATE: number;
-    readonly SVG_TRANSFORM_UNKNOWN: number;
-};
-
-interface SVGTransformList {
-    readonly numberOfItems: number;
-    appendItem(newItem: SVGTransform): SVGTransform;
-    clear(): void;
-    consolidate(): SVGTransform;
-    createSVGTransformFromMatrix(matrix: SVGMatrix): SVGTransform;
-    getItem(index: number): SVGTransform;
-    initialize(newItem: SVGTransform): SVGTransform;
-    insertItemBefore(newItem: SVGTransform, index: number): SVGTransform;
-    removeItem(index: number): SVGTransform;
-    replaceItem(newItem: SVGTransform, index: number): SVGTransform;
-}
-
-declare var SVGTransformList: {
-    prototype: SVGTransformList;
-    new(): SVGTransformList;
-};
-
-interface SVGURIReference {
-    readonly href: SVGAnimatedString;
-}
-
-interface SVGUnitTypes {
-    readonly SVG_UNIT_TYPE_OBJECTBOUNDINGBOX: number;
-    readonly SVG_UNIT_TYPE_UNKNOWN: number;
-    readonly SVG_UNIT_TYPE_USERSPACEONUSE: number;
-}
-declare var SVGUnitTypes: SVGUnitTypes;
-
-interface SVGUseElement extends SVGGraphicsElement, SVGURIReference {
-    readonly animatedInstanceRoot: SVGElementInstance | null;
-    readonly height: SVGAnimatedLength;
-    readonly instanceRoot: SVGElementInstance | null;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGUseElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGUseElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGUseElement: {
-    prototype: SVGUseElement;
-    new(): SVGUseElement;
-};
-
-interface SVGViewElement extends SVGElement, SVGFitToViewBox, SVGZoomAndPan {
-    /** @deprecated */
-    readonly viewTarget: SVGStringList;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGViewElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGViewElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGViewElement: {
-    prototype: SVGViewElement;
-    new(): SVGViewElement;
-};
-
-interface SVGZoomAndPan {
-    readonly zoomAndPan: number;
-}
-
-declare var SVGZoomAndPan: {
-    readonly SVG_ZOOMANDPAN_DISABLE: number;
-    readonly SVG_ZOOMANDPAN_MAGNIFY: number;
-    readonly SVG_ZOOMANDPAN_UNKNOWN: number;
-};
-
-interface SVGZoomEvent extends UIEvent {
-    readonly newScale: number;
-    readonly newTranslate: SVGPoint;
-    readonly previousScale: number;
-    readonly previousTranslate: SVGPoint;
-    readonly zoomRectScreen: SVGRect;
-}
-
-declare var SVGZoomEvent: {
-    prototype: SVGZoomEvent;
-    new(): SVGZoomEvent;
-};
-
-interface ScopedCredential {
-    readonly id: ArrayBuffer;
-    readonly type: ScopedCredentialType;
-}
-
-declare var ScopedCredential: {
-    prototype: ScopedCredential;
-    new(): ScopedCredential;
-};
-
-interface ScopedCredentialInfo {
-    readonly credential: ScopedCredential;
-    readonly publicKey: CryptoKey;
-}
-
-declare var ScopedCredentialInfo: {
-    prototype: ScopedCredentialInfo;
-    new(): ScopedCredentialInfo;
-};
-
-interface ScreenEventMap {
-    "MSOrientationChange": Event;
-}
-
-interface Screen extends EventTarget {
-    readonly availHeight: number;
-    readonly availWidth: number;
-    /** @deprecated */
-    bufferDepth: number;
-    readonly colorDepth: number;
-    readonly deviceXDPI: number;
-    readonly deviceYDPI: number;
-    readonly fontSmoothingEnabled: boolean;
-    readonly height: number;
-    readonly logicalXDPI: number;
-    readonly logicalYDPI: number;
-    readonly msOrientation: string;
-    onmsorientationchange: ((this: Screen, ev: Event) => any) | null;
-    readonly pixelDepth: number;
-    readonly systemXDPI: number;
-    readonly systemYDPI: number;
-    readonly width: number;
-    lockOrientation(orientations: OrientationLockType | OrientationLockType[]): boolean;
-    msLockOrientation(orientations: string | string[]): boolean;
-    msUnlockOrientation(): void;
-    unlockOrientation(): void;
-    addEventListener<K extends keyof ScreenEventMap>(type: K, listener: (this: Screen, ev: ScreenEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof ScreenEventMap>(type: K, listener: (this: Screen, ev: ScreenEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var Screen: {
-    prototype: Screen;
-    new(): Screen;
-};
-
-interface ScriptProcessorNodeEventMap {
-    "audioprocess": AudioProcessingEvent;
-}
-
-interface ScriptProcessorNode extends AudioNode {
-    /** @deprecated */
-    readonly bufferSize: number;
-    /** @deprecated */
-    onaudioprocess: ((this: ScriptProcessorNode, ev: AudioProcessingEvent) => any) | null;
-    addEventListener<K extends keyof ScriptProcessorNodeEventMap>(type: K, listener: (this: ScriptProcessorNode, ev: ScriptProcessorNodeEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof ScriptProcessorNodeEventMap>(type: K, listener: (this: ScriptProcessorNode, ev: ScriptProcessorNodeEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var ScriptProcessorNode: {
-    prototype: ScriptProcessorNode;
-    new(): ScriptProcessorNode;
-};
-
-interface ScrollIntoViewOptions extends ScrollOptions {
-    block?: ScrollLogicalPosition;
-    inline?: ScrollLogicalPosition;
-}
-
-interface ScrollOptions {
-    behavior?: ScrollBehavior;
-}
-
-interface ScrollToOptions extends ScrollOptions {
-    left?: number;
-    top?: number;
-}
-
-interface SecurityPolicyViolationEvent extends Event {
-    readonly blockedURI: string;
-    readonly columnNumber: number;
-    readonly documentURI: string;
-    readonly effectiveDirective: string;
-    readonly lineNumber: number;
-    readonly originalPolicy: string;
-    readonly referrer: string;
-    readonly sourceFile: string;
-    readonly statusCode: number;
-    readonly violatedDirective: string;
-}
-
-declare var SecurityPolicyViolationEvent: {
-    prototype: SecurityPolicyViolationEvent;
-    new(type: string, eventInitDict?: SecurityPolicyViolationEventInit): SecurityPolicyViolationEvent;
-};
-
-interface Selection {
-    readonly anchorNode: Node;
-    readonly anchorOffset: number;
-    readonly baseNode: Node;
-    readonly baseOffset: number;
-    readonly extentNode: Node;
-    readonly extentOffset: number;
-    readonly focusNode: Node;
-    readonly focusOffset: number;
-    readonly isCollapsed: boolean;
-    readonly rangeCount: number;
-    readonly type: string;
-    addRange(range: Range): void;
-    collapse(parentNode: Node, offset: number): void;
-    collapseToEnd(): void;
-    collapseToStart(): void;
-    containsNode(node: Node, partlyContained: boolean): boolean;
-    deleteFromDocument(): void;
-    empty(): void;
-    extend(newNode: Node, offset: number): void;
-    getRangeAt(index: number): Range;
-    removeAllRanges(): void;
-    removeRange(range: Range): void;
-    selectAllChildren(parentNode: Node): void;
-    setBaseAndExtent(baseNode: Node, baseOffset: number, extentNode: Node, extentOffset: number): void;
-    setPosition(parentNode: Node, offset: number): void;
-    toString(): string;
-}
-
-declare var Selection: {
-    prototype: Selection;
-    new(): Selection;
-};
-
-interface ServiceUIFrameContext {
-    getCachedFrameMessage(key: string): string;
-    postFrameMessage(key: string, data: string): void;
-}
-declare var ServiceUIFrameContext: ServiceUIFrameContext;
-
-interface ServiceWorkerEventMap extends AbstractWorkerEventMap {
-    "statechange": Event;
-}
-
-interface ServiceWorker extends EventTarget, AbstractWorker {
-    onstatechange: ((this: ServiceWorker, ev: Event) => any) | null;
-    readonly scriptURL: string;
-    readonly state: ServiceWorkerState;
-    postMessage(message: any, transfer?: any[]): void;
-    addEventListener<K extends keyof ServiceWorkerEventMap>(type: K, listener: (this: ServiceWorker, ev: ServiceWorkerEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof ServiceWorkerEventMap>(type: K, listener: (this: ServiceWorker, ev: ServiceWorkerEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var ServiceWorker: {
-    prototype: ServiceWorker;
-    new(): ServiceWorker;
-};
-
-interface ServiceWorkerContainerEventMap {
-    "controllerchange": Event;
-    "message": ServiceWorkerMessageEvent;
-    "messageerror": MessageEvent;
-}
-
-interface ServiceWorkerContainer extends EventTarget {
-    readonly controller: ServiceWorker | null;
-    oncontrollerchange: ((this: ServiceWorkerContainer, ev: Event) => any) | null;
-    onmessage: ((this: ServiceWorkerContainer, ev: ServiceWorkerMessageEvent) => any) | null;
-    onmessageerror: ((this: ServiceWorkerContainer, ev: MessageEvent) => any) | null;
-    readonly ready: Promise<ServiceWorkerRegistration>;
-    getRegistration(clientURL?: string): Promise<ServiceWorkerRegistration | undefined>;
-    getRegistrations(): Promise<ServiceWorkerRegistration[]>;
-    register(scriptURL: string, options?: RegistrationOptions): Promise<ServiceWorkerRegistration>;
-    startMessages(): void;
-    addEventListener<K extends keyof ServiceWorkerContainerEventMap>(type: K, listener: (this: ServiceWorkerContainer, ev: ServiceWorkerContainerEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof ServiceWorkerContainerEventMap>(type: K, listener: (this: ServiceWorkerContainer, ev: ServiceWorkerContainerEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var ServiceWorkerContainer: {
-    prototype: ServiceWorkerContainer;
-    new(): ServiceWorkerContainer;
-};
-
-interface ServiceWorkerMessageEvent extends Event {
-    readonly data: any;
-    readonly lastEventId: string;
-    readonly origin: string;
-    readonly ports: ReadonlyArray<MessagePort> | null;
-    readonly source: ServiceWorker | MessagePort | null;
-}
-
-declare var ServiceWorkerMessageEvent: {
-    prototype: ServiceWorkerMessageEvent;
-    new(type: string, eventInitDict?: ServiceWorkerMessageEventInit): ServiceWorkerMessageEvent;
-};
-
-interface ServiceWorkerRegistrationEventMap {
-    "updatefound": Event;
-}
-
-interface ServiceWorkerRegistration extends EventTarget {
-    readonly active: ServiceWorker | null;
-    readonly installing: ServiceWorker | null;
-    onupdatefound: ((this: ServiceWorkerRegistration, ev: Event) => any) | null;
-    readonly pushManager: PushManager;
-    readonly scope: string;
-    readonly sync: SyncManager;
-    readonly waiting: ServiceWorker | null;
-    getNotifications(filter?: GetNotificationOptions): Promise<Notification[]>;
-    showNotification(title: string, options?: NotificationOptions): Promise<void>;
-    unregister(): Promise<boolean>;
-    update(): Promise<void>;
-    addEventListener<K extends keyof ServiceWorkerRegistrationEventMap>(type: K, listener: (this: ServiceWorkerRegistration, ev: ServiceWorkerRegistrationEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof ServiceWorkerRegistrationEventMap>(type: K, listener: (this: ServiceWorkerRegistration, ev: ServiceWorkerRegistrationEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var ServiceWorkerRegistration: {
-    prototype: ServiceWorkerRegistration;
-    new(): ServiceWorkerRegistration;
-};
-
-interface ShadowRoot extends DocumentOrShadowRoot, DocumentFragment {
-    readonly host: Element;
-    innerHTML: string;
-}
-
-interface ShadowRootInit {
-    delegatesFocus?: boolean;
-    mode: "open" | "closed";
-}
-
-interface SourceBuffer extends EventTarget {
-    appendWindowEnd: number;
-    appendWindowStart: number;
-    readonly audioTracks: AudioTrackList;
-    readonly buffered: TimeRanges;
-    mode: AppendMode;
-    readonly textTracks: TextTrackList;
-    timestampOffset: number;
-    readonly updating: boolean;
-    readonly videoTracks: VideoTrackList;
-    abort(): void;
-    appendBuffer(data: ArrayBuffer | Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | null): void;
-    appendStream(stream: MSStream, maxSize?: number): void;
-    remove(start: number, end: number): void;
-}
-
-declare var SourceBuffer: {
-    prototype: SourceBuffer;
-    new(): SourceBuffer;
-};
-
-interface SourceBufferList extends EventTarget {
-    readonly length: number;
-    item(index: number): SourceBuffer;
-    [index: number]: SourceBuffer;
-}
-
-declare var SourceBufferList: {
-    prototype: SourceBufferList;
-    new(): SourceBufferList;
-};
-
-interface SpeechSynthesisEventMap {
-    "voiceschanged": Event;
-}
-
-interface SpeechSynthesis extends EventTarget {
-    onvoiceschanged: ((this: SpeechSynthesis, ev: Event) => any) | null;
-    readonly paused: boolean;
-    readonly pending: boolean;
-    readonly speaking: boolean;
-    cancel(): void;
-    getVoices(): SpeechSynthesisVoice[];
-    pause(): void;
-    resume(): void;
-    speak(utterance: SpeechSynthesisUtterance): void;
-    addEventListener<K extends keyof SpeechSynthesisEventMap>(type: K, listener: (this: SpeechSynthesis, ev: SpeechSynthesisEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SpeechSynthesisEventMap>(type: K, listener: (this: SpeechSynthesis, ev: SpeechSynthesisEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SpeechSynthesis: {
-    prototype: SpeechSynthesis;
-    new(): SpeechSynthesis;
-};
-
-interface SpeechSynthesisEvent extends Event {
-    readonly charIndex: number;
-    readonly charLength: number;
-    readonly elapsedTime: number;
-    readonly name: string;
-    readonly utterance: SpeechSynthesisUtterance;
-}
-
-declare var SpeechSynthesisEvent: {
-    prototype: SpeechSynthesisEvent;
-    new(type: string, eventInitDict?: SpeechSynthesisEventInit): SpeechSynthesisEvent;
-};
-
-interface SpeechSynthesisUtteranceEventMap {
-    "boundary": Event;
-    "end": Event;
-    "error": Event;
-    "mark": Event;
-    "pause": Event;
-    "resume": Event;
-    "start": Event;
-}
-
-interface SpeechSynthesisUtterance extends EventTarget {
-    lang: string;
-    onboundary: ((this: SpeechSynthesisUtterance, ev: Event) => any) | null;
-    onend: ((this: SpeechSynthesisUtterance, ev: Event) => any) | null;
-    onerror: ((this: SpeechSynthesisUtterance, ev: Event) => any) | null;
-    onmark: ((this: SpeechSynthesisUtterance, ev: Event) => any) | null;
-    onpause: ((this: SpeechSynthesisUtterance, ev: Event) => any) | null;
-    onresume: ((this: SpeechSynthesisUtterance, ev: Event) => any) | null;
-    onstart: ((this: SpeechSynthesisUtterance, ev: Event) => any) | null;
-    pitch: number;
-    rate: number;
-    text: string;
-    voice: SpeechSynthesisVoice;
-    volume: number;
-    addEventListener<K extends keyof SpeechSynthesisUtteranceEventMap>(type: K, listener: (this: SpeechSynthesisUtterance, ev: SpeechSynthesisUtteranceEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SpeechSynthesisUtteranceEventMap>(type: K, listener: (this: SpeechSynthesisUtterance, ev: SpeechSynthesisUtteranceEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SpeechSynthesisUtterance: {
-    prototype: SpeechSynthesisUtterance;
-    new(): SpeechSynthesisUtterance;
-    new(text: string): SpeechSynthesisUtterance;
-};
-
-interface SpeechSynthesisVoice {
-    readonly default: boolean;
-    readonly lang: string;
-    readonly localService: boolean;
-    readonly name: string;
-    readonly voiceURI: string;
-}
-
-declare var SpeechSynthesisVoice: {
-    prototype: SpeechSynthesisVoice;
-    new(): SpeechSynthesisVoice;
-};
-
-interface StereoPannerNode extends AudioNode {
-    readonly pan: AudioParam;
-}
-
-declare var StereoPannerNode: {
-    prototype: StereoPannerNode;
-    new(): StereoPannerNode;
-};
-
-interface Storage {
-    readonly length: number;
-    clear(): void;
-    getItem(key: string): string | null;
-    key(index: number): string | null;
-    removeItem(key: string): void;
-    setItem(key: string, value: string): void;
-    [key: string]: any;
-}
-
-declare var Storage: {
-    prototype: Storage;
-    new(): Storage;
-};
-
-interface StorageEvent extends Event {
-    readonly key: string | null;
-    readonly newValue: string | null;
-    readonly oldValue: string | null;
-    readonly storageArea: Storage | null;
-    readonly url: string;
-}
-
-declare var StorageEvent: {
-    prototype: StorageEvent;
-    new (type: string, eventInitDict?: StorageEventInit): StorageEvent;
-};
-
-interface StorageEventInit extends EventInit {
-    key?: string;
-    newValue?: string;
-    oldValue?: string;
-    storageArea?: Storage;
-    url: string;
-}
-
-interface StyleMedia {
-    readonly type: string;
-    matchMedium(mediaquery: string): boolean;
-}
-
-declare var StyleMedia: {
-    prototype: StyleMedia;
-    new(): StyleMedia;
-};
-
-interface StyleSheet {
-    disabled: boolean;
-    readonly href: string | null;
-    readonly media: MediaList;
-    readonly ownerNode: Node;
-    readonly parentStyleSheet: StyleSheet | null;
-    readonly title: string | null;
-    readonly type: string;
-}
-
-declare var StyleSheet: {
-    prototype: StyleSheet;
-    new(): StyleSheet;
-};
-
-interface StyleSheetList {
-    readonly length: number;
-    item(index: number): StyleSheet | null;
-    [index: number]: StyleSheet;
-}
-
-declare var StyleSheetList: {
-    prototype: StyleSheetList;
-    new(): StyleSheetList;
-};
-
-interface SubtleCrypto {
-    decrypt(algorithm: string | RsaOaepParams | AesCtrParams | AesCbcParams | AesCmacParams | AesGcmParams | AesCfbParams, key: CryptoKey, data: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer): PromiseLike<ArrayBuffer>;
-    deriveBits(algorithm: string | EcdhKeyDeriveParams | DhKeyDeriveParams | ConcatParams | HkdfCtrParams | Pbkdf2Params, baseKey: CryptoKey, length: number): PromiseLike<ArrayBuffer>;
-    deriveKey(algorithm: string | EcdhKeyDeriveParams | DhKeyDeriveParams | ConcatParams | HkdfCtrParams | Pbkdf2Params, baseKey: CryptoKey, derivedKeyType: string | AesDerivedKeyParams | HmacImportParams | ConcatParams | HkdfCtrParams | Pbkdf2Params, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKey>;
-    digest(algorithm: string | Algorithm, data: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer): PromiseLike<ArrayBuffer>;
-    encrypt(algorithm: string | RsaOaepParams | AesCtrParams | AesCbcParams | AesCmacParams | AesGcmParams | AesCfbParams, key: CryptoKey, data: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer): PromiseLike<ArrayBuffer>;
-    exportKey(format: "jwk", key: CryptoKey): PromiseLike<JsonWebKey>;
-    exportKey(format: "raw" | "pkcs8" | "spki", key: CryptoKey): PromiseLike<ArrayBuffer>;
-    exportKey(format: string, key: CryptoKey): PromiseLike<JsonWebKey | ArrayBuffer>;
-    generateKey(algorithm: string, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKeyPair | CryptoKey>;
-    generateKey(algorithm: RsaHashedKeyGenParams | EcKeyGenParams | DhKeyGenParams, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKeyPair>;
-    generateKey(algorithm: AesKeyGenParams | HmacKeyGenParams | Pbkdf2Params, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKey>;
-    importKey(format: "jwk", keyData: JsonWebKey, algorithm: string | RsaHashedImportParams | EcKeyImportParams | HmacImportParams | DhImportKeyParams, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKey>;
-    importKey(format: "raw" | "pkcs8" | "spki", keyData: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer, algorithm: string | RsaHashedImportParams | EcKeyImportParams | HmacImportParams | DhImportKeyParams, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKey>;
-    importKey(format: string, keyData: JsonWebKey | Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer, algorithm: string | RsaHashedImportParams | EcKeyImportParams | HmacImportParams | DhImportKeyParams, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKey>;
-    sign(algorithm: string | RsaPssParams | EcdsaParams | AesCmacParams, key: CryptoKey, data: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer): PromiseLike<ArrayBuffer>;
-    unwrapKey(format: string, wrappedKey: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer, unwrappingKey: CryptoKey, unwrapAlgorithm: string | Algorithm, unwrappedKeyAlgorithm: string | Algorithm, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKey>;
-    verify(algorithm: string | RsaPssParams | EcdsaParams | AesCmacParams, key: CryptoKey, signature: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer, data: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer): PromiseLike<boolean>;
-    wrapKey(format: string, key: CryptoKey, wrappingKey: CryptoKey, wrapAlgorithm: string | Algorithm): PromiseLike<ArrayBuffer>;
-}
-
-declare var SubtleCrypto: {
-    prototype: SubtleCrypto;
-    new(): SubtleCrypto;
-};
-
-interface SyncManager {
-    getTags(): Promise<string[]>;
-    register(tag: string): Promise<void>;
-}
-
-declare var SyncManager: {
-    prototype: SyncManager;
-    new(): SyncManager;
-};
-
-interface Text extends CharacterData {
-    readonly assignedSlot: HTMLSlotElement | null;
-    readonly wholeText: string;
-    splitText(offset: number): Text;
-}
-
-declare var Text: {
-    prototype: Text;
-    new(data?: string): Text;
-};
-
-interface TextDecoder {
-    readonly encoding: string;
-    readonly fatal: boolean;
-    readonly ignoreBOM: boolean;
-    decode(input?: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null, options?: TextDecodeOptions): string;
-}
-
-declare var TextDecoder: {
-    prototype: TextDecoder;
-    new(label?: string, options?: TextDecoderOptions): TextDecoder;
-};
-
-interface TextEncoder {
-    readonly encoding: string;
-    encode(input?: string): Uint8Array;
-}
-
-declare var TextEncoder: {
-    prototype: TextEncoder;
-    new(): TextEncoder;
-};
-
-interface TextEvent extends UIEvent {
-    readonly data: string;
-    initTextEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, dataArg: string, inputMethod: number, locale: string): void;
-    readonly DOM_INPUT_METHOD_DROP: number;
-    readonly DOM_INPUT_METHOD_HANDWRITING: number;
-    readonly DOM_INPUT_METHOD_IME: number;
-    readonly DOM_INPUT_METHOD_KEYBOARD: number;
-    readonly DOM_INPUT_METHOD_MULTIMODAL: number;
-    readonly DOM_INPUT_METHOD_OPTION: number;
-    readonly DOM_INPUT_METHOD_PASTE: number;
-    readonly DOM_INPUT_METHOD_SCRIPT: number;
-    readonly DOM_INPUT_METHOD_UNKNOWN: number;
-    readonly DOM_INPUT_METHOD_VOICE: number;
-}
-
-declare var TextEvent: {
-    prototype: TextEvent;
-    new(): TextEvent;
-    readonly DOM_INPUT_METHOD_DROP: number;
-    readonly DOM_INPUT_METHOD_HANDWRITING: number;
-    readonly DOM_INPUT_METHOD_IME: number;
-    readonly DOM_INPUT_METHOD_KEYBOARD: number;
-    readonly DOM_INPUT_METHOD_MULTIMODAL: number;
-    readonly DOM_INPUT_METHOD_OPTION: number;
-    readonly DOM_INPUT_METHOD_PASTE: number;
-    readonly DOM_INPUT_METHOD_SCRIPT: number;
-    readonly DOM_INPUT_METHOD_UNKNOWN: number;
-    readonly DOM_INPUT_METHOD_VOICE: number;
-};
-
-interface TextMetrics {
-    readonly width: number;
-}
-
-declare var TextMetrics: {
-    prototype: TextMetrics;
-    new(): TextMetrics;
-};
-
-interface TextTrackEventMap {
-    "cuechange": Event;
-    "error": Event;
-    "load": Event;
-}
-
-interface TextTrack extends EventTarget {
-    readonly activeCues: TextTrackCueList;
-    readonly cues: TextTrackCueList;
-    readonly inBandMetadataTrackDispatchType: string;
-    readonly kind: string;
-    readonly label: string;
-    readonly language: string;
-    mode: TextTrackMode | number;
-    oncuechange: ((this: TextTrack, ev: Event) => any) | null;
-    onerror: ((this: TextTrack, ev: Event) => any) | null;
-    onload: ((this: TextTrack, ev: Event) => any) | null;
-    readonly readyState: number;
-    addCue(cue: TextTrackCue): void;
-    removeCue(cue: TextTrackCue): void;
-    readonly DISABLED: number;
-    readonly ERROR: number;
-    readonly HIDDEN: number;
-    readonly LOADED: number;
-    readonly LOADING: number;
-    readonly NONE: number;
-    readonly SHOWING: number;
-    addEventListener<K extends keyof TextTrackEventMap>(type: K, listener: (this: TextTrack, ev: TextTrackEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof TextTrackEventMap>(type: K, listener: (this: TextTrack, ev: TextTrackEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var TextTrack: {
-    prototype: TextTrack;
-    new(): TextTrack;
-    readonly DISABLED: number;
-    readonly ERROR: number;
-    readonly HIDDEN: number;
-    readonly LOADED: number;
-    readonly LOADING: number;
-    readonly NONE: number;
-    readonly SHOWING: number;
-};
-
-interface TextTrackCueEventMap {
-    "enter": Event;
-    "exit": Event;
-}
-
-interface TextTrackCue extends EventTarget {
-    endTime: number;
-    id: string;
-    onenter: ((this: TextTrackCue, ev: Event) => any) | null;
-    onexit: ((this: TextTrackCue, ev: Event) => any) | null;
-    pauseOnExit: boolean;
-    startTime: number;
-    text: string;
-    readonly track: TextTrack;
-    getCueAsHTML(): DocumentFragment;
-    addEventListener<K extends keyof TextTrackCueEventMap>(type: K, listener: (this: TextTrackCue, ev: TextTrackCueEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof TextTrackCueEventMap>(type: K, listener: (this: TextTrackCue, ev: TextTrackCueEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var TextTrackCue: {
-    prototype: TextTrackCue;
-    new(startTime: number, endTime: number, text: string): TextTrackCue;
-};
-
-interface TextTrackCueList {
-    readonly length: number;
-    getCueById(id: string): TextTrackCue;
-    item(index: number): TextTrackCue;
-    [index: number]: TextTrackCue;
-}
-
-declare var TextTrackCueList: {
-    prototype: TextTrackCueList;
-    new(): TextTrackCueList;
-};
-
-interface TextTrackListEventMap {
-    "addtrack": TrackEvent;
-}
-
-interface TextTrackList extends EventTarget {
-    readonly length: number;
-    onaddtrack: ((this: TextTrackList, ev: TrackEvent) => any) | null;
-    item(index: number): TextTrack;
-    addEventListener<K extends keyof TextTrackListEventMap>(type: K, listener: (this: TextTrackList, ev: TextTrackListEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof TextTrackListEventMap>(type: K, listener: (this: TextTrackList, ev: TextTrackListEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-    [index: number]: TextTrack;
-}
-
-declare var TextTrackList: {
-    prototype: TextTrackList;
-    new(): TextTrackList;
-};
-
-interface TimeRanges {
-    readonly length: number;
-    end(index: number): number;
-    start(index: number): number;
-}
-
-declare var TimeRanges: {
-    prototype: TimeRanges;
-    new(): TimeRanges;
-};
-
-interface Touch {
-    readonly clientX: number;
-    readonly clientY: number;
-    readonly identifier: number;
-    readonly pageX: number;
-    readonly pageY: number;
-    readonly screenX: number;
-    readonly screenY: number;
-    readonly target: EventTarget;
-}
-
-declare var Touch: {
-    prototype: Touch;
-    new(): Touch;
-};
-
-interface TouchEvent extends UIEvent {
-    readonly altKey: boolean;
-    readonly changedTouches: TouchList;
-    readonly charCode: number;
-    readonly ctrlKey: boolean;
-    readonly keyCode: number;
-    readonly metaKey: boolean;
-    readonly shiftKey: boolean;
-    readonly targetTouches: TouchList;
-    readonly touches: TouchList;
-    /** @deprecated */
-    readonly which: number;
-}
-
-declare var TouchEvent: {
-    prototype: TouchEvent;
-    new(type: string, touchEventInit?: TouchEventInit): TouchEvent;
-};
-
-interface TouchEventInit extends EventModifierInit {
-    changedTouches?: Touch[];
-    targetTouches?: Touch[];
-    touches?: Touch[];
-}
-
-interface TouchList {
-    readonly length: number;
-    item(index: number): Touch | null;
-    [index: number]: Touch;
-}
-
-declare var TouchList: {
-    prototype: TouchList;
-    new(): TouchList;
-};
-
-interface TrackEvent extends Event {
-    readonly track: VideoTrack | AudioTrack | TextTrack | null;
-}
-
-declare var TrackEvent: {
-    prototype: TrackEvent;
-    new(typeArg: string, eventInitDict?: TrackEventInit): TrackEvent;
-};
-
-interface TransitionEvent extends Event {
-    readonly elapsedTime: number;
-    readonly propertyName: string;
-    initTransitionEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, propertyNameArg: string, elapsedTimeArg: number): void;
-}
-
-declare var TransitionEvent: {
-    prototype: TransitionEvent;
-    new(typeArg: string, eventInitDict?: TransitionEventInit): TransitionEvent;
-};
-
-interface TreeWalker {
-    currentNode: Node;
-    /** @deprecated */
-    readonly expandEntityReferences: boolean;
-    readonly filter: NodeFilter | null;
-    readonly root: Node;
-    readonly whatToShow: number;
-    firstChild(): Node | null;
-    lastChild(): Node | null;
-    nextNode(): Node | null;
-    nextSibling(): Node | null;
-    parentNode(): Node | null;
-    previousNode(): Node | null;
-    previousSibling(): Node | null;
-}
-
-declare var TreeWalker: {
-    prototype: TreeWalker;
-    new(): TreeWalker;
-};
-
-interface UIEvent extends Event {
-    readonly detail: number;
-    readonly view: Window;
-    initUIEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number): void;
-}
-
-declare var UIEvent: {
-    prototype: UIEvent;
-    new(typeArg: string, eventInitDict?: UIEventInit): UIEvent;
-};
-
-interface URL {
-    hash: string;
-    host: string;
-    hostname: string;
-    href: string;
-    readonly origin: string;
-    password: string;
-    pathname: string;
-    port: string;
-    protocol: string;
-    search: string;
-    readonly searchParams: URLSearchParams;
-    username: string;
-    toString(): string;
-}
-
-declare var URL: {
-    prototype: URL;
-    new(url: string, base?: string | URL): URL;
-    createObjectURL(object: any, options?: ObjectURLOptions): string;
-    revokeObjectURL(url: string): void;
-};
-
-interface URLSearchParams {
-    /**
-     * Appends a specified key/value pair as a new search parameter.
-     */
-    append(name: string, value: string): void;
-    /**
-     * Deletes the given search parameter, and its associated value, from the list of all search parameters.
-     */
-    delete(name: string): void;
-    /**
-     * Returns the first value associated to the given search parameter.
-     */
-    get(name: string): string | null;
-    /**
-     * Returns all the values association with a given search parameter.
-     */
-    getAll(name: string): string[];
-    /**
-     * Returns a Boolean indicating if such a search parameter exists.
-     */
-    has(name: string): boolean;
-    /**
-     * Sets the value associated to a given search parameter to the given value. If there were several values, delete the others.
-     */
-    set(name: string, value: string): void;
-}
-
-declare var URLSearchParams: {
-    prototype: URLSearchParams;
-    new (init?: string | URLSearchParams): URLSearchParams;
-};
-
-interface VRDisplay extends EventTarget {
-    readonly capabilities: VRDisplayCapabilities;
-    depthFar: number;
-    depthNear: number;
-    readonly displayId: number;
-    readonly displayName: string;
-    readonly isConnected: boolean;
-    readonly isPresenting: boolean;
-    readonly stageParameters: VRStageParameters | null;
-    cancelAnimationFrame(handle: number): void;
-    exitPresent(): Promise<void>;
-    getEyeParameters(whichEye: string): VREyeParameters;
-    getFrameData(frameData: VRFrameData): boolean;
-    getLayers(): VRLayer[];
-    /** @deprecated */
-    getPose(): VRPose;
-    requestAnimationFrame(callback: FrameRequestCallback): number;
-    requestPresent(layers: VRLayer[]): Promise<void>;
-    resetPose(): void;
-    submitFrame(pose?: VRPose): void;
-}
-
-declare var VRDisplay: {
-    prototype: VRDisplay;
-    new(): VRDisplay;
-};
-
-interface VRDisplayCapabilities {
-    readonly canPresent: boolean;
-    readonly hasExternalDisplay: boolean;
-    readonly hasOrientation: boolean;
-    readonly hasPosition: boolean;
-    readonly maxLayers: number;
-}
-
-declare var VRDisplayCapabilities: {
-    prototype: VRDisplayCapabilities;
-    new(): VRDisplayCapabilities;
-};
-
-interface VRDisplayEvent extends Event {
-    readonly display: VRDisplay;
-    readonly reason: VRDisplayEventReason | null;
-}
-
-declare var VRDisplayEvent: {
-    prototype: VRDisplayEvent;
-    new(type: string, eventInitDict: VRDisplayEventInit): VRDisplayEvent;
-};
-
-interface VREyeParameters {
-    /** @deprecated */
-    readonly fieldOfView: VRFieldOfView;
-    readonly offset: Float32Array;
-    readonly renderHeight: number;
-    readonly renderWidth: number;
-}
-
-declare var VREyeParameters: {
-    prototype: VREyeParameters;
-    new(): VREyeParameters;
-};
-
-interface VRFieldOfView {
-    readonly downDegrees: number;
-    readonly leftDegrees: number;
-    readonly rightDegrees: number;
-    readonly upDegrees: number;
-}
-
-declare var VRFieldOfView: {
-    prototype: VRFieldOfView;
-    new(): VRFieldOfView;
-};
-
-interface VRFrameData {
-    readonly leftProjectionMatrix: Float32Array;
-    readonly leftViewMatrix: Float32Array;
-    readonly pose: VRPose;
-    readonly rightProjectionMatrix: Float32Array;
-    readonly rightViewMatrix: Float32Array;
-    readonly timestamp: number;
-}
-
-declare var VRFrameData: {
-    prototype: VRFrameData;
-    new(): VRFrameData;
-};
-
-interface VRPose {
-    readonly angularAcceleration: Float32Array | null;
-    readonly angularVelocity: Float32Array | null;
-    readonly linearAcceleration: Float32Array | null;
-    readonly linearVelocity: Float32Array | null;
-    readonly orientation: Float32Array | null;
-    readonly position: Float32Array | null;
-    readonly timestamp: number;
-}
-
-declare var VRPose: {
-    prototype: VRPose;
-    new(): VRPose;
-};
-
-interface ValidityState {
-    readonly badInput: boolean;
-    readonly customError: boolean;
-    readonly patternMismatch: boolean;
-    readonly rangeOverflow: boolean;
-    readonly rangeUnderflow: boolean;
-    readonly stepMismatch: boolean;
-    readonly tooLong: boolean;
-    readonly tooShort: boolean;
-    readonly typeMismatch: boolean;
-    readonly valid: boolean;
-    readonly valueMissing: boolean;
-}
-
-declare var ValidityState: {
-    prototype: ValidityState;
-    new(): ValidityState;
-};
-
-interface VideoPlaybackQuality {
-    readonly corruptedVideoFrames: number;
-    readonly creationTime: number;
-    readonly droppedVideoFrames: number;
-    readonly totalFrameDelay: number;
-    readonly totalVideoFrames: number;
-}
-
-declare var VideoPlaybackQuality: {
-    prototype: VideoPlaybackQuality;
-    new(): VideoPlaybackQuality;
-};
-
-interface VideoTrack {
-    readonly id: string;
-    kind: string;
-    readonly label: string;
-    language: string;
-    selected: boolean;
-    readonly sourceBuffer: SourceBuffer;
-}
-
-declare var VideoTrack: {
-    prototype: VideoTrack;
-    new(): VideoTrack;
-};
-
-interface VideoTrackListEventMap {
-    "addtrack": TrackEvent;
-    "change": Event;
-    "removetrack": TrackEvent;
-}
-
-interface VideoTrackList extends EventTarget {
-    readonly length: number;
-    onaddtrack: ((this: VideoTrackList, ev: TrackEvent) => any) | null;
-    onchange: ((this: VideoTrackList, ev: Event) => any) | null;
-    onremovetrack: ((this: VideoTrackList, ev: TrackEvent) => any) | null;
-    readonly selectedIndex: number;
-    getTrackById(id: string): VideoTrack | null;
-    item(index: number): VideoTrack;
-    addEventListener<K extends keyof VideoTrackListEventMap>(type: K, listener: (this: VideoTrackList, ev: VideoTrackListEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof VideoTrackListEventMap>(type: K, listener: (this: VideoTrackList, ev: VideoTrackListEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-    [index: number]: VideoTrack;
-}
-
-declare var VideoTrackList: {
-    prototype: VideoTrackList;
-    new(): VideoTrackList;
-};
-
-interface WEBGL_color_buffer_float {
-    readonly FRAMEBUFFER_ATTACHMENT_COMPONENT_TYPE_EXT: number;
-    readonly RGB32F_EXT: number;
-    readonly RGBA32F_EXT: number;
-    readonly UNSIGNED_NORMALIZED_EXT: number;
-}
-
-interface WEBGL_compressed_texture_astc {
-    readonly COMPRESSED_RGBA_ASTC_10x10_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_10x5_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_10x6_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_10x8_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_12x10_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_12x12_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_4x4_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_5x4_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_5x5_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_6x5_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_6x6_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_8x5_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_8x6_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_8x8_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_10x10_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_10x5_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_10x6_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_10x8_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_12x10_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_12x12_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_4x4_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_5x4_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_5x5_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_6x5_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_6x6_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_8x5_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_8x6_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_8x8_KHR: number;
-    getSupportedProfiles(): string[];
-}
-
-interface WEBGL_compressed_texture_s3tc {
-    readonly COMPRESSED_RGBA_S3TC_DXT1_EXT: number;
-    readonly COMPRESSED_RGBA_S3TC_DXT3_EXT: number;
-    readonly COMPRESSED_RGBA_S3TC_DXT5_EXT: number;
-    readonly COMPRESSED_RGB_S3TC_DXT1_EXT: number;
-}
-
-declare var WEBGL_compressed_texture_s3tc: {
-    prototype: WEBGL_compressed_texture_s3tc;
-    new(): WEBGL_compressed_texture_s3tc;
-    readonly COMPRESSED_RGBA_S3TC_DXT1_EXT: number;
-    readonly COMPRESSED_RGBA_S3TC_DXT3_EXT: number;
-    readonly COMPRESSED_RGBA_S3TC_DXT5_EXT: number;
-    readonly COMPRESSED_RGB_S3TC_DXT1_EXT: number;
-};
-
-interface WEBGL_compressed_texture_s3tc_srgb {
-    readonly COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT: number;
-    readonly COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT: number;
-    readonly COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT: number;
-    readonly COMPRESSED_SRGB_S3TC_DXT1_EXT: number;
-}
-
-interface WEBGL_debug_renderer_info {
-    readonly UNMASKED_RENDERER_WEBGL: number;
-    readonly UNMASKED_VENDOR_WEBGL: number;
-}
-
-declare var WEBGL_debug_renderer_info: {
-    prototype: WEBGL_debug_renderer_info;
-    new(): WEBGL_debug_renderer_info;
-    readonly UNMASKED_RENDERER_WEBGL: number;
-    readonly UNMASKED_VENDOR_WEBGL: number;
-};
-
-interface WEBGL_debug_shaders {
-    getTranslatedShaderSource(shader: WebGLShader): string;
-}
-
-interface WEBGL_depth_texture {
-    readonly UNSIGNED_INT_24_8_WEBGL: number;
-}
-
-declare var WEBGL_depth_texture: {
-    prototype: WEBGL_depth_texture;
-    new(): WEBGL_depth_texture;
-    readonly UNSIGNED_INT_24_8_WEBGL: number;
-};
-
-interface WEBGL_draw_buffers {
-    readonly COLOR_ATTACHMENT0_WEBGL: number;
-    readonly COLOR_ATTACHMENT10_WEBGL: number;
-    readonly COLOR_ATTACHMENT11_WEBGL: number;
-    readonly COLOR_ATTACHMENT12_WEBGL: number;
-    readonly COLOR_ATTACHMENT13_WEBGL: number;
-    readonly COLOR_ATTACHMENT14_WEBGL: number;
-    readonly COLOR_ATTACHMENT15_WEBGL: number;
-    readonly COLOR_ATTACHMENT1_WEBGL: number;
-    readonly COLOR_ATTACHMENT2_WEBGL: number;
-    readonly COLOR_ATTACHMENT3_WEBGL: number;
-    readonly COLOR_ATTACHMENT4_WEBGL: number;
-    readonly COLOR_ATTACHMENT5_WEBGL: number;
-    readonly COLOR_ATTACHMENT6_WEBGL: number;
-    readonly COLOR_ATTACHMENT7_WEBGL: number;
-    readonly COLOR_ATTACHMENT8_WEBGL: number;
-    readonly COLOR_ATTACHMENT9_WEBGL: number;
-    readonly DRAW_BUFFER0_WEBGL: number;
-    readonly DRAW_BUFFER10_WEBGL: number;
-    readonly DRAW_BUFFER11_WEBGL: number;
-    readonly DRAW_BUFFER12_WEBGL: number;
-    readonly DRAW_BUFFER13_WEBGL: number;
-    readonly DRAW_BUFFER14_WEBGL: number;
-    readonly DRAW_BUFFER15_WEBGL: number;
-    readonly DRAW_BUFFER1_WEBGL: number;
-    readonly DRAW_BUFFER2_WEBGL: number;
-    readonly DRAW_BUFFER3_WEBGL: number;
-    readonly DRAW_BUFFER4_WEBGL: number;
-    readonly DRAW_BUFFER5_WEBGL: number;
-    readonly DRAW_BUFFER6_WEBGL: number;
-    readonly DRAW_BUFFER7_WEBGL: number;
-    readonly DRAW_BUFFER8_WEBGL: number;
-    readonly DRAW_BUFFER9_WEBGL: number;
-    readonly MAX_COLOR_ATTACHMENTS_WEBGL: number;
-    readonly MAX_DRAW_BUFFERS_WEBGL: number;
-    drawBuffersWEBGL(buffers: number[]): void;
-}
-
-interface WEBGL_lose_context {
-    loseContext(): void;
-    restoreContext(): void;
-}
-
-interface WaveShaperNode extends AudioNode {
-    curve: Float32Array | null;
-    oversample: OverSampleType;
-}
-
-declare var WaveShaperNode: {
-    prototype: WaveShaperNode;
-    new(): WaveShaperNode;
-};
-
-interface WebAuthentication {
-    getAssertion(assertionChallenge: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null, options?: AssertionOptions): Promise<WebAuthnAssertion>;
-    makeCredential(accountInformation: Account, cryptoParameters: ScopedCredentialParameters[], attestationChallenge: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null, options?: ScopedCredentialOptions): Promise<ScopedCredentialInfo>;
-}
-
-declare var WebAuthentication: {
-    prototype: WebAuthentication;
-    new(): WebAuthentication;
-};
-
-interface WebAuthnAssertion {
-    readonly authenticatorData: ArrayBuffer;
-    readonly clientData: ArrayBuffer;
-    readonly credential: ScopedCredential;
-    readonly signature: ArrayBuffer;
-}
-
-declare var WebAuthnAssertion: {
-    prototype: WebAuthnAssertion;
-    new(): WebAuthnAssertion;
-};
-
-interface WebGLActiveInfo {
-    readonly name: string;
-    readonly size: number;
-    readonly type: number;
-}
-
-declare var WebGLActiveInfo: {
-    prototype: WebGLActiveInfo;
-    new(): WebGLActiveInfo;
-};
-
-interface WebGLBuffer extends WebGLObject {
-}
-
-declare var WebGLBuffer: {
-    prototype: WebGLBuffer;
-    new(): WebGLBuffer;
-};
-
-interface WebGLContextEvent extends Event {
-    readonly statusMessage: string;
-}
-
-declare var WebGLContextEvent: {
-    prototype: WebGLContextEvent;
-    new(typeArg: string, eventInitDict?: WebGLContextEventInit): WebGLContextEvent;
-};
-
-interface WebGLFramebuffer extends WebGLObject {
-}
-
-declare var WebGLFramebuffer: {
-    prototype: WebGLFramebuffer;
-    new(): WebGLFramebuffer;
-};
-
-interface WebGLObject {
-}
-
-declare var WebGLObject: {
-    prototype: WebGLObject;
-    new(): WebGLObject;
-};
-
-interface WebGLProgram extends WebGLObject {
-}
-
-declare var WebGLProgram: {
-    prototype: WebGLProgram;
-    new(): WebGLProgram;
-};
-
-interface WebGLRenderbuffer extends WebGLObject {
-}
-
-declare var WebGLRenderbuffer: {
-    prototype: WebGLRenderbuffer;
-    new(): WebGLRenderbuffer;
-};
-
-interface WebGLRenderingContext {
-    readonly canvas: HTMLCanvasElement;
-    readonly drawingBufferHeight: number;
-    readonly drawingBufferWidth: number;
-    activeTexture(texture: number): void;
-    attachShader(program: WebGLProgram | null, shader: WebGLShader | null): void;
-    bindAttribLocation(program: WebGLProgram | null, index: number, name: string): void;
-    bindBuffer(target: number, buffer: WebGLBuffer | null): void;
-    bindFramebuffer(target: number, framebuffer: WebGLFramebuffer | null): void;
-    bindRenderbuffer(target: number, renderbuffer: WebGLRenderbuffer | null): void;
-    bindTexture(target: number, texture: WebGLTexture | null): void;
-    blendColor(red: number, green: number, blue: number, alpha: number): void;
-    blendEquation(mode: number): void;
-    blendEquationSeparate(modeRGB: number, modeAlpha: number): void;
-    blendFunc(sfactor: number, dfactor: number): void;
-    blendFuncSeparate(srcRGB: number, dstRGB: number, srcAlpha: number, dstAlpha: number): void;
-    bufferData(target: number, size: number | Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null, usage: number): void;
-    bufferSubData(target: number, offset: number, data: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null): void;
-    checkFramebufferStatus(target: number): number;
-    clear(mask: number): void;
-    clearColor(red: number, green: number, blue: number, alpha: number): void;
-    clearDepth(depth: number): void;
-    clearStencil(s: number): void;
-    colorMask(red: boolean, green: boolean, blue: boolean, alpha: boolean): void;
-    compileShader(shader: WebGLShader | null): void;
-    compressedTexImage2D(target: number, level: number, internalformat: number, width: number, height: number, border: number, data: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | null): void;
-    compressedTexSubImage2D(target: number, level: number, xoffset: number, yoffset: number, width: number, height: number, format: number, data: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | null): void;
-    copyTexImage2D(target: number, level: number, internalformat: number, x: number, y: number, width: number, height: number, border: number): void;
-    copyTexSubImage2D(target: number, level: number, xoffset: number, yoffset: number, x: number, y: number, width: number, height: number): void;
-    createBuffer(): WebGLBuffer | null;
-    createFramebuffer(): WebGLFramebuffer | null;
-    createProgram(): WebGLProgram | null;
-    createRenderbuffer(): WebGLRenderbuffer | null;
-    createShader(type: number): WebGLShader | null;
-    createTexture(): WebGLTexture | null;
-    cullFace(mode: number): void;
-    deleteBuffer(buffer: WebGLBuffer | null): void;
-    deleteFramebuffer(framebuffer: WebGLFramebuffer | null): void;
-    deleteProgram(program: WebGLProgram | null): void;
-    deleteRenderbuffer(renderbuffer: WebGLRenderbuffer | null): void;
-    deleteShader(shader: WebGLShader | null): void;
-    deleteTexture(texture: WebGLTexture | null): void;
-    depthFunc(func: number): void;
-    depthMask(flag: boolean): void;
-    depthRange(zNear: number, zFar: number): void;
-    detachShader(program: WebGLProgram | null, shader: WebGLShader | null): void;
-    disable(cap: number): void;
-    disableVertexAttribArray(index: number): void;
-    drawArrays(mode: number, first: number, count: number): void;
-    drawElements(mode: number, count: number, type: number, offset: number): void;
-    enable(cap: number): void;
-    enableVertexAttribArray(index: number): void;
-    finish(): void;
-    flush(): void;
-    framebufferRenderbuffer(target: number, attachment: number, renderbuffertarget: number, renderbuffer: WebGLRenderbuffer | null): void;
-    framebufferTexture2D(target: number, attachment: number, textarget: number, texture: WebGLTexture | null, level: number): void;
-    frontFace(mode: number): void;
-    generateMipmap(target: number): void;
-    getActiveAttrib(program: WebGLProgram | null, index: number): WebGLActiveInfo | null;
-    getActiveUniform(program: WebGLProgram | null, index: number): WebGLActiveInfo | null;
-    getAttachedShaders(program: WebGLProgram | null): WebGLShader[] | null;
-    getAttribLocation(program: WebGLProgram | null, name: string): number;
-    getBufferParameter(target: number, pname: number): any;
-    getContextAttributes(): WebGLContextAttributes;
-    getError(): number;
-    getExtension(extensionName: "EXT_blend_minmax"): EXT_blend_minmax | null;
-    getExtension(extensionName: "EXT_texture_filter_anisotropic"): EXT_texture_filter_anisotropic | null;
-    getExtension(extensionName: "EXT_frag_depth"): EXT_frag_depth | null;
-    getExtension(extensionName: "EXT_shader_texture_lod"): EXT_shader_texture_lod | null;
-    getExtension(extensionName: "EXT_sRGB"): EXT_sRGB | null;
-    getExtension(extensionName: "OES_vertex_array_object"): OES_vertex_array_object | null;
-    getExtension(extensionName: "WEBGL_color_buffer_float"): WEBGL_color_buffer_float | null;
-    getExtension(extensionName: "WEBGL_compressed_texture_astc"): WEBGL_compressed_texture_astc | null;
-    getExtension(extensionName: "WEBGL_compressed_texture_s3tc_srgb"): WEBGL_compressed_texture_s3tc_srgb | null;
-    getExtension(extensionName: "WEBGL_debug_shaders"): WEBGL_debug_shaders | null;
-    getExtension(extensionName: "WEBGL_draw_buffers"): WEBGL_draw_buffers | null;
-    getExtension(extensionName: "WEBGL_lose_context"): WEBGL_lose_context | null;
-    getExtension(extensionName: "WEBGL_depth_texture"): WEBGL_depth_texture | null;
-    getExtension(extensionName: "WEBGL_debug_renderer_info"): WEBGL_debug_renderer_info | null;
-    getExtension(extensionName: "WEBGL_compressed_texture_s3tc"): WEBGL_compressed_texture_s3tc | null;
-    getExtension(extensionName: "OES_texture_half_float_linear"): OES_texture_half_float_linear | null;
-    getExtension(extensionName: "OES_texture_half_float"): OES_texture_half_float | null;
-    getExtension(extensionName: "OES_texture_float_linear"): OES_texture_float_linear | null;
-    getExtension(extensionName: "OES_texture_float"): OES_texture_float | null;
-    getExtension(extensionName: "OES_standard_derivatives"): OES_standard_derivatives | null;
-    getExtension(extensionName: "OES_element_index_uint"): OES_element_index_uint | null;
-    getExtension(extensionName: "ANGLE_instanced_arrays"): ANGLE_instanced_arrays | null;
-    getExtension(extensionName: string): any;
-    getFramebufferAttachmentParameter(target: number, attachment: number, pname: number): any;
-    getParameter(pname: number): any;
-    getProgramInfoLog(program: WebGLProgram | null): string | null;
-    getProgramParameter(program: WebGLProgram | null, pname: number): any;
-    getRenderbufferParameter(target: number, pname: number): any;
-    getShaderInfoLog(shader: WebGLShader | null): string | null;
-    getShaderParameter(shader: WebGLShader | null, pname: number): any;
-    getShaderPrecisionFormat(shadertype: number, precisiontype: number): WebGLShaderPrecisionFormat | null;
-    getShaderSource(shader: WebGLShader | null): string | null;
-    getSupportedExtensions(): string[] | null;
-    getTexParameter(target: number, pname: number): any;
-    getUniform(program: WebGLProgram | null, location: WebGLUniformLocation | null): any;
-    getUniformLocation(program: WebGLProgram | null, name: string): WebGLUniformLocation | null;
-    getVertexAttrib(index: number, pname: number): any;
-    getVertexAttribOffset(index: number, pname: number): number;
-    hint(target: number, mode: number): void;
-    isBuffer(buffer: WebGLBuffer | null): boolean;
-    isContextLost(): boolean;
-    isEnabled(cap: number): boolean;
-    isFramebuffer(framebuffer: WebGLFramebuffer | null): boolean;
-    isProgram(program: WebGLProgram | null): boolean;
-    isRenderbuffer(renderbuffer: WebGLRenderbuffer | null): boolean;
-    isShader(shader: WebGLShader | null): boolean;
-    isTexture(texture: WebGLTexture | null): boolean;
-    lineWidth(width: number): void;
-    linkProgram(program: WebGLProgram | null): void;
-    pixelStorei(pname: number, param: number | boolean): void;
-    polygonOffset(factor: number, units: number): void;
-    readPixels(x: number, y: number, width: number, height: number, format: number, type: number, pixels: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | null): void;
-    renderbufferStorage(target: number, internalformat: number, width: number, height: number): void;
-    sampleCoverage(value: number, invert: boolean): void;
-    scissor(x: number, y: number, width: number, height: number): void;
-    shaderSource(shader: WebGLShader | null, source: string): void;
-    stencilFunc(func: number, ref: number, mask: number): void;
-    stencilFuncSeparate(face: number, func: number, ref: number, mask: number): void;
-    stencilMask(mask: number): void;
-    stencilMaskSeparate(face: number, mask: number): void;
-    stencilOp(fail: number, zfail: number, zpass: number): void;
-    stencilOpSeparate(face: number, fail: number, zfail: number, zpass: number): void;
-    texImage2D(target: number, level: number, internalformat: number, width: number, height: number, border: number, format: number, type: number, pixels: ArrayBufferView | null): void;
-    texImage2D(target: number, level: number, internalformat: number, format: number, type: number, pixels: ImageBitmap | ImageData | HTMLVideoElement | HTMLImageElement | HTMLCanvasElement): void;
-    texParameterf(target: number, pname: number, param: number): void;
-    texParameteri(target: number, pname: number, param: number): void;
-    texSubImage2D(target: number, level: number, xoffset: number, yoffset: number, width: number, height: number, format: number, type: number, pixels: ArrayBufferView | null): void;
-    texSubImage2D(target: number, level: number, xoffset: number, yoffset: number, format: number, type: number, pixels: ImageBitmap | ImageData | HTMLVideoElement | HTMLImageElement | HTMLCanvasElement): void;
-    uniform1f(location: WebGLUniformLocation | null, x: number): void;
-    uniform1fv(location: WebGLUniformLocation | null, v: Float32Array | ArrayLike<number>): void;
-    uniform1i(location: WebGLUniformLocation | null, x: number): void;
-    uniform1iv(location: WebGLUniformLocation | null, v: Int32Array | ArrayLike<number>): void;
-    uniform2f(location: WebGLUniformLocation | null, x: number, y: number): void;
-    uniform2fv(location: WebGLUniformLocation | null, v: Float32Array | ArrayLike<number>): void;
-    uniform2i(location: WebGLUniformLocation | null, x: number, y: number): void;
-    uniform2iv(location: WebGLUniformLocation | null, v: Int32Array | ArrayLike<number>): void;
-    uniform3f(location: WebGLUniformLocation | null, x: number, y: number, z: number): void;
-    uniform3fv(location: WebGLUniformLocation | null, v: Float32Array | ArrayLike<number>): void;
-    uniform3i(location: WebGLUniformLocation | null, x: number, y: number, z: number): void;
-    uniform3iv(location: WebGLUniformLocation | null, v: Int32Array | ArrayLike<number>): void;
-    uniform4f(location: WebGLUniformLocation | null, x: number, y: number, z: number, w: number): void;
-    uniform4fv(location: WebGLUniformLocation | null, v: Float32Array | ArrayLike<number>): void;
-    uniform4i(location: WebGLUniformLocation | null, x: number, y: number, z: number, w: number): void;
-    uniform4iv(location: WebGLUniformLocation | null, v: Int32Array | ArrayLike<number>): void;
-    uniformMatrix2fv(location: WebGLUniformLocation | null, transpose: boolean, value: Float32Array | ArrayLike<number>): void;
-    uniformMatrix3fv(location: WebGLUniformLocation | null, transpose: boolean, value: Float32Array | ArrayLike<number>): void;
-    uniformMatrix4fv(location: WebGLUniformLocation | null, transpose: boolean, value: Float32Array | ArrayLike<number>): void;
-    useProgram(program: WebGLProgram | null): void;
-    validateProgram(program: WebGLProgram | null): void;
-    vertexAttrib1f(indx: number, x: number): void;
-    vertexAttrib1fv(indx: number, values: Float32Array | number[]): void;
-    vertexAttrib2f(indx: number, x: number, y: number): void;
-    vertexAttrib2fv(indx: number, values: Float32Array | number[]): void;
-    vertexAttrib3f(indx: number, x: number, y: number, z: number): void;
-    vertexAttrib3fv(indx: number, values: Float32Array | number[]): void;
-    vertexAttrib4f(indx: number, x: number, y: number, z: number, w: number): void;
-    vertexAttrib4fv(indx: number, values: Float32Array | number[]): void;
-    vertexAttribPointer(indx: number, size: number, type: number, normalized: boolean, stride: number, offset: number): void;
-    viewport(x: number, y: number, width: number, height: number): void;
-    readonly ACTIVE_ATTRIBUTES: number;
-    readonly ACTIVE_TEXTURE: number;
-    readonly ACTIVE_UNIFORMS: number;
-    readonly ALIASED_LINE_WIDTH_RANGE: number;
-    readonly ALIASED_POINT_SIZE_RANGE: number;
-    readonly ALPHA: number;
-    readonly ALPHA_BITS: number;
-    readonly ALWAYS: number;
-    readonly ARRAY_BUFFER: number;
-    readonly ARRAY_BUFFER_BINDING: number;
-    readonly ATTACHED_SHADERS: number;
-    readonly BACK: number;
-    readonly BLEND: number;
-    readonly BLEND_COLOR: number;
-    readonly BLEND_DST_ALPHA: number;
-    readonly BLEND_DST_RGB: number;
-    readonly BLEND_EQUATION: number;
-    readonly BLEND_EQUATION_ALPHA: number;
-    readonly BLEND_EQUATION_RGB: number;
-    readonly BLEND_SRC_ALPHA: number;
-    readonly BLEND_SRC_RGB: number;
-    readonly BLUE_BITS: number;
-    readonly BOOL: number;
-    readonly BOOL_VEC2: number;
-    readonly BOOL_VEC3: number;
-    readonly BOOL_VEC4: number;
-    readonly BROWSER_DEFAULT_WEBGL: number;
-    readonly BUFFER_SIZE: number;
-    readonly BUFFER_USAGE: number;
-    readonly BYTE: number;
-    readonly CCW: number;
-    readonly CLAMP_TO_EDGE: number;
-    readonly COLOR_ATTACHMENT0: number;
-    readonly COLOR_BUFFER_BIT: number;
-    readonly COLOR_CLEAR_VALUE: number;
-    readonly COLOR_WRITEMASK: number;
-    readonly COMPILE_STATUS: number;
-    readonly COMPRESSED_TEXTURE_FORMATS: number;
-    readonly CONSTANT_ALPHA: number;
-    readonly CONSTANT_COLOR: number;
-    readonly CONTEXT_LOST_WEBGL: number;
-    readonly CULL_FACE: number;
-    readonly CULL_FACE_MODE: number;
-    readonly CURRENT_PROGRAM: number;
-    readonly CURRENT_VERTEX_ATTRIB: number;
-    readonly CW: number;
-    readonly DECR: number;
-    readonly DECR_WRAP: number;
-    readonly DELETE_STATUS: number;
-    readonly DEPTH_ATTACHMENT: number;
-    readonly DEPTH_BITS: number;
-    readonly DEPTH_BUFFER_BIT: number;
-    readonly DEPTH_CLEAR_VALUE: number;
-    readonly DEPTH_COMPONENT: number;
-    readonly DEPTH_COMPONENT16: number;
-    readonly DEPTH_FUNC: number;
-    readonly DEPTH_RANGE: number;
-    readonly DEPTH_STENCIL: number;
-    readonly DEPTH_STENCIL_ATTACHMENT: number;
-    readonly DEPTH_TEST: number;
-    readonly DEPTH_WRITEMASK: number;
-    readonly DITHER: number;
-    readonly DONT_CARE: number;
-    readonly DST_ALPHA: number;
-    readonly DST_COLOR: number;
-    readonly DYNAMIC_DRAW: number;
-    readonly ELEMENT_ARRAY_BUFFER: number;
-    readonly ELEMENT_ARRAY_BUFFER_BINDING: number;
-    readonly EQUAL: number;
-    readonly FASTEST: number;
-    readonly FLOAT: number;
-    readonly FLOAT_MAT2: number;
-    readonly FLOAT_MAT3: number;
-    readonly FLOAT_MAT4: number;
-    readonly FLOAT_VEC2: number;
-    readonly FLOAT_VEC3: number;
-    readonly FLOAT_VEC4: number;
-    readonly FRAGMENT_SHADER: number;
-    readonly FRAMEBUFFER: number;
-    readonly FRAMEBUFFER_ATTACHMENT_OBJECT_NAME: number;
-    readonly FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE: number;
-    readonly FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACE: number;
-    readonly FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL: number;
-    readonly FRAMEBUFFER_BINDING: number;
-    readonly FRAMEBUFFER_COMPLETE: number;
-    readonly FRAMEBUFFER_INCOMPLETE_ATTACHMENT: number;
-    readonly FRAMEBUFFER_INCOMPLETE_DIMENSIONS: number;
-    readonly FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT: number;
-    readonly FRAMEBUFFER_UNSUPPORTED: number;
-    readonly FRONT: number;
-    readonly FRONT_AND_BACK: number;
-    readonly FRONT_FACE: number;
-    readonly FUNC_ADD: number;
-    readonly FUNC_REVERSE_SUBTRACT: number;
-    readonly FUNC_SUBTRACT: number;
-    readonly GENERATE_MIPMAP_HINT: number;
-    readonly GEQUAL: number;
-    readonly GREATER: number;
-    readonly GREEN_BITS: number;
-    readonly HIGH_FLOAT: number;
-    readonly HIGH_INT: number;
-    readonly IMPLEMENTATION_COLOR_READ_FORMAT: number;
-    readonly IMPLEMENTATION_COLOR_READ_TYPE: number;
-    readonly INCR: number;
-    readonly INCR_WRAP: number;
-    readonly INT: number;
-    readonly INT_VEC2: number;
-    readonly INT_VEC3: number;
-    readonly INT_VEC4: number;
-    readonly INVALID_ENUM: number;
-    readonly INVALID_FRAMEBUFFER_OPERATION: number;
-    readonly INVALID_OPERATION: number;
-    readonly INVALID_VALUE: number;
-    readonly INVERT: number;
-    readonly KEEP: number;
-    readonly LEQUAL: number;
-    readonly LESS: number;
-    readonly LINEAR: number;
-    readonly LINEAR_MIPMAP_LINEAR: number;
-    readonly LINEAR_MIPMAP_NEAREST: number;
-    readonly LINES: number;
-    readonly LINE_LOOP: number;
-    readonly LINE_STRIP: number;
-    readonly LINE_WIDTH: number;
-    readonly LINK_STATUS: number;
-    readonly LOW_FLOAT: number;
-    readonly LOW_INT: number;
-    readonly LUMINANCE: number;
-    readonly LUMINANCE_ALPHA: number;
-    readonly MAX_COMBINED_TEXTURE_IMAGE_UNITS: number;
-    readonly MAX_CUBE_MAP_TEXTURE_SIZE: number;
-    readonly MAX_FRAGMENT_UNIFORM_VECTORS: number;
-    readonly MAX_RENDERBUFFER_SIZE: number;
-    readonly MAX_TEXTURE_IMAGE_UNITS: number;
-    readonly MAX_TEXTURE_SIZE: number;
-    readonly MAX_VARYING_VECTORS: number;
-    readonly MAX_VERTEX_ATTRIBS: number;
-    readonly MAX_VERTEX_TEXTURE_IMAGE_UNITS: number;
-    readonly MAX_VERTEX_UNIFORM_VECTORS: number;
-    readonly MAX_VIEWPORT_DIMS: number;
-    readonly MEDIUM_FLOAT: number;
-    readonly MEDIUM_INT: number;
-    readonly MIRRORED_REPEAT: number;
-    readonly NEAREST: number;
-    readonly NEAREST_MIPMAP_LINEAR: number;
-    readonly NEAREST_MIPMAP_NEAREST: number;
-    readonly NEVER: number;
-    readonly NICEST: number;
-    readonly NONE: number;
-    readonly NOTEQUAL: number;
-    readonly NO_ERROR: number;
-    readonly ONE: number;
-    readonly ONE_MINUS_CONSTANT_ALPHA: number;
-    readonly ONE_MINUS_CONSTANT_COLOR: number;
-    readonly ONE_MINUS_DST_ALPHA: number;
-    readonly ONE_MINUS_DST_COLOR: number;
-    readonly ONE_MINUS_SRC_ALPHA: number;
-    readonly ONE_MINUS_SRC_COLOR: number;
-    readonly OUT_OF_MEMORY: number;
-    readonly PACK_ALIGNMENT: number;
-    readonly POINTS: number;
-    readonly POLYGON_OFFSET_FACTOR: number;
-    readonly POLYGON_OFFSET_FILL: number;
-    readonly POLYGON_OFFSET_UNITS: number;
-    readonly RED_BITS: number;
-    readonly RENDERBUFFER: number;
-    readonly RENDERBUFFER_ALPHA_SIZE: number;
-    readonly RENDERBUFFER_BINDING: number;
-    readonly RENDERBUFFER_BLUE_SIZE: number;
-    readonly RENDERBUFFER_DEPTH_SIZE: number;
-    readonly RENDERBUFFER_GREEN_SIZE: number;
-    readonly RENDERBUFFER_HEIGHT: number;
-    readonly RENDERBUFFER_INTERNAL_FORMAT: number;
-    readonly RENDERBUFFER_RED_SIZE: number;
-    readonly RENDERBUFFER_STENCIL_SIZE: number;
-    readonly RENDERBUFFER_WIDTH: number;
-    readonly RENDERER: number;
-    readonly REPEAT: number;
-    readonly REPLACE: number;
-    readonly RGB: number;
-    readonly RGB565: number;
-    readonly RGB5_A1: number;
-    readonly RGBA: number;
-    readonly RGBA4: number;
-    readonly SAMPLER_2D: number;
-    readonly SAMPLER_CUBE: number;
-    readonly SAMPLES: number;
-    readonly SAMPLE_ALPHA_TO_COVERAGE: number;
-    readonly SAMPLE_BUFFERS: number;
-    readonly SAMPLE_COVERAGE: number;
-    readonly SAMPLE_COVERAGE_INVERT: number;
-    readonly SAMPLE_COVERAGE_VALUE: number;
-    readonly SCISSOR_BOX: number;
-    readonly SCISSOR_TEST: number;
-    readonly SHADER_TYPE: number;
-    readonly SHADING_LANGUAGE_VERSION: number;
-    readonly SHORT: number;
-    readonly SRC_ALPHA: number;
-    readonly SRC_ALPHA_SATURATE: number;
-    readonly SRC_COLOR: number;
-    readonly STATIC_DRAW: number;
-    readonly STENCIL_ATTACHMENT: number;
-    readonly STENCIL_BACK_FAIL: number;
-    readonly STENCIL_BACK_FUNC: number;
-    readonly STENCIL_BACK_PASS_DEPTH_FAIL: number;
-    readonly STENCIL_BACK_PASS_DEPTH_PASS: number;
-    readonly STENCIL_BACK_REF: number;
-    readonly STENCIL_BACK_VALUE_MASK: number;
-    readonly STENCIL_BACK_WRITEMASK: number;
-    readonly STENCIL_BITS: number;
-    readonly STENCIL_BUFFER_BIT: number;
-    readonly STENCIL_CLEAR_VALUE: number;
-    readonly STENCIL_FAIL: number;
-    readonly STENCIL_FUNC: number;
-    readonly STENCIL_INDEX: number;
-    readonly STENCIL_INDEX8: number;
-    readonly STENCIL_PASS_DEPTH_FAIL: number;
-    readonly STENCIL_PASS_DEPTH_PASS: number;
-    readonly STENCIL_REF: number;
-    readonly STENCIL_TEST: number;
-    readonly STENCIL_VALUE_MASK: number;
-    readonly STENCIL_WRITEMASK: number;
-    readonly STREAM_DRAW: number;
-    readonly SUBPIXEL_BITS: number;
-    readonly TEXTURE: number;
-    readonly TEXTURE0: number;
-    readonly TEXTURE1: number;
-    readonly TEXTURE10: number;
-    readonly TEXTURE11: number;
-    readonly TEXTURE12: number;
-    readonly TEXTURE13: number;
-    readonly TEXTURE14: number;
-    readonly TEXTURE15: number;
-    readonly TEXTURE16: number;
-    readonly TEXTURE17: number;
-    readonly TEXTURE18: number;
-    readonly TEXTURE19: number;
-    readonly TEXTURE2: number;
-    readonly TEXTURE20: number;
-    readonly TEXTURE21: number;
-    readonly TEXTURE22: number;
-    readonly TEXTURE23: number;
-    readonly TEXTURE24: number;
-    readonly TEXTURE25: number;
-    readonly TEXTURE26: number;
-    readonly TEXTURE27: number;
-    readonly TEXTURE28: number;
-    readonly TEXTURE29: number;
-    readonly TEXTURE3: number;
-    readonly TEXTURE30: number;
-    readonly TEXTURE31: number;
-    readonly TEXTURE4: number;
-    readonly TEXTURE5: number;
-    readonly TEXTURE6: number;
-    readonly TEXTURE7: number;
-    readonly TEXTURE8: number;
-    readonly TEXTURE9: number;
-    readonly TEXTURE_2D: number;
-    readonly TEXTURE_BINDING_2D: number;
-    readonly TEXTURE_BINDING_CUBE_MAP: number;
-    readonly TEXTURE_CUBE_MAP: number;
-    readonly TEXTURE_CUBE_MAP_NEGATIVE_X: number;
-    readonly TEXTURE_CUBE_MAP_NEGATIVE_Y: number;
-    readonly TEXTURE_CUBE_MAP_NEGATIVE_Z: number;
-    readonly TEXTURE_CUBE_MAP_POSITIVE_X: number;
-    readonly TEXTURE_CUBE_MAP_POSITIVE_Y: number;
-    readonly TEXTURE_CUBE_MAP_POSITIVE_Z: number;
-    readonly TEXTURE_MAG_FILTER: number;
-    readonly TEXTURE_MIN_FILTER: number;
-    readonly TEXTURE_WRAP_S: number;
-    readonly TEXTURE_WRAP_T: number;
-    readonly TRIANGLES: number;
-    readonly TRIANGLE_FAN: number;
-    readonly TRIANGLE_STRIP: number;
-    readonly UNPACK_ALIGNMENT: number;
-    readonly UNPACK_COLORSPACE_CONVERSION_WEBGL: number;
-    readonly UNPACK_FLIP_Y_WEBGL: number;
-    readonly UNPACK_PREMULTIPLY_ALPHA_WEBGL: number;
-    readonly UNSIGNED_BYTE: number;
-    readonly UNSIGNED_INT: number;
-    readonly UNSIGNED_SHORT: number;
-    readonly UNSIGNED_SHORT_4_4_4_4: number;
-    readonly UNSIGNED_SHORT_5_5_5_1: number;
-    readonly UNSIGNED_SHORT_5_6_5: number;
-    readonly VALIDATE_STATUS: number;
-    readonly VENDOR: number;
-    readonly VERSION: number;
-    readonly VERTEX_ATTRIB_ARRAY_BUFFER_BINDING: number;
-    readonly VERTEX_ATTRIB_ARRAY_ENABLED: number;
-    readonly VERTEX_ATTRIB_ARRAY_NORMALIZED: number;
-    readonly VERTEX_ATTRIB_ARRAY_POINTER: number;
-    readonly VERTEX_ATTRIB_ARRAY_SIZE: number;
-    readonly VERTEX_ATTRIB_ARRAY_STRIDE: number;
-    readonly VERTEX_ATTRIB_ARRAY_TYPE: number;
-    readonly VERTEX_SHADER: number;
-    readonly VIEWPORT: number;
-    readonly ZERO: number;
-}
-
-declare var WebGLRenderingContext: {
-    prototype: WebGLRenderingContext;
-    new(): WebGLRenderingContext;
-    readonly ACTIVE_ATTRIBUTES: number;
-    readonly ACTIVE_TEXTURE: number;
-    readonly ACTIVE_UNIFORMS: number;
-    readonly ALIASED_LINE_WIDTH_RANGE: number;
-    readonly ALIASED_POINT_SIZE_RANGE: number;
-    readonly ALPHA: number;
-    readonly ALPHA_BITS: number;
-    readonly ALWAYS: number;
-    readonly ARRAY_BUFFER: number;
-    readonly ARRAY_BUFFER_BINDING: number;
-    readonly ATTACHED_SHADERS: number;
-    readonly BACK: number;
-    readonly BLEND: number;
-    readonly BLEND_COLOR: number;
-    readonly BLEND_DST_ALPHA: number;
-    readonly BLEND_DST_RGB: number;
-    readonly BLEND_EQUATION: number;
-    readonly BLEND_EQUATION_ALPHA: number;
-    readonly BLEND_EQUATION_RGB: number;
-    readonly BLEND_SRC_ALPHA: number;
-    readonly BLEND_SRC_RGB: number;
-    readonly BLUE_BITS: number;
-    readonly BOOL: number;
-    readonly BOOL_VEC2: number;
-    readonly BOOL_VEC3: number;
-    readonly BOOL_VEC4: number;
-    readonly BROWSER_DEFAULT_WEBGL: number;
-    readonly BUFFER_SIZE: number;
-    readonly BUFFER_USAGE: number;
-    readonly BYTE: number;
-    readonly CCW: number;
-    readonly CLAMP_TO_EDGE: number;
-    readonly COLOR_ATTACHMENT0: number;
-    readonly COLOR_BUFFER_BIT: number;
-    readonly COLOR_CLEAR_VALUE: number;
-    readonly COLOR_WRITEMASK: number;
-    readonly COMPILE_STATUS: number;
-    readonly COMPRESSED_TEXTURE_FORMATS: number;
-    readonly CONSTANT_ALPHA: number;
-    readonly CONSTANT_COLOR: number;
-    readonly CONTEXT_LOST_WEBGL: number;
-    readonly CULL_FACE: number;
-    readonly CULL_FACE_MODE: number;
-    readonly CURRENT_PROGRAM: number;
-    readonly CURRENT_VERTEX_ATTRIB: number;
-    readonly CW: number;
-    readonly DECR: number;
-    readonly DECR_WRAP: number;
-    readonly DELETE_STATUS: number;
-    readonly DEPTH_ATTACHMENT: number;
-    readonly DEPTH_BITS: number;
-    readonly DEPTH_BUFFER_BIT: number;
-    readonly DEPTH_CLEAR_VALUE: number;
-    readonly DEPTH_COMPONENT: number;
-    readonly DEPTH_COMPONENT16: number;
-    readonly DEPTH_FUNC: number;
-    readonly DEPTH_RANGE: number;
-    readonly DEPTH_STENCIL: number;
-    readonly DEPTH_STENCIL_ATTACHMENT: number;
-    readonly DEPTH_TEST: number;
-    readonly DEPTH_WRITEMASK: number;
-    readonly DITHER: number;
-    readonly DONT_CARE: number;
-    readonly DST_ALPHA: number;
-    readonly DST_COLOR: number;
-    readonly DYNAMIC_DRAW: number;
-    readonly ELEMENT_ARRAY_BUFFER: number;
-    readonly ELEMENT_ARRAY_BUFFER_BINDING: number;
-    readonly EQUAL: number;
-    readonly FASTEST: number;
-    readonly FLOAT: number;
-    readonly FLOAT_MAT2: number;
-    readonly FLOAT_MAT3: number;
-    readonly FLOAT_MAT4: number;
-    readonly FLOAT_VEC2: number;
-    readonly FLOAT_VEC3: number;
-    readonly FLOAT_VEC4: number;
-    readonly FRAGMENT_SHADER: number;
-    readonly FRAMEBUFFER: number;
-    readonly FRAMEBUFFER_ATTACHMENT_OBJECT_NAME: number;
-    readonly FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE: number;
-    readonly FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACE: number;
-    readonly FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL: number;
-    readonly FRAMEBUFFER_BINDING: number;
-    readonly FRAMEBUFFER_COMPLETE: number;
-    readonly FRAMEBUFFER_INCOMPLETE_ATTACHMENT: number;
-    readonly FRAMEBUFFER_INCOMPLETE_DIMENSIONS: number;
-    readonly FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT: number;
-    readonly FRAMEBUFFER_UNSUPPORTED: number;
-    readonly FRONT: number;
-    readonly FRONT_AND_BACK: number;
-    readonly FRONT_FACE: number;
-    readonly FUNC_ADD: number;
-    readonly FUNC_REVERSE_SUBTRACT: number;
-    readonly FUNC_SUBTRACT: number;
-    readonly GENERATE_MIPMAP_HINT: number;
-    readonly GEQUAL: number;
-    readonly GREATER: number;
-    readonly GREEN_BITS: number;
-    readonly HIGH_FLOAT: number;
-    readonly HIGH_INT: number;
-    readonly IMPLEMENTATION_COLOR_READ_FORMAT: number;
-    readonly IMPLEMENTATION_COLOR_READ_TYPE: number;
-    readonly INCR: number;
-    readonly INCR_WRAP: number;
-    readonly INT: number;
-    readonly INT_VEC2: number;
-    readonly INT_VEC3: number;
-    readonly INT_VEC4: number;
-    readonly INVALID_ENUM: number;
-    readonly INVALID_FRAMEBUFFER_OPERATION: number;
-    readonly INVALID_OPERATION: number;
-    readonly INVALID_VALUE: number;
-    readonly INVERT: number;
-    readonly KEEP: number;
-    readonly LEQUAL: number;
-    readonly LESS: number;
-    readonly LINEAR: number;
-    readonly LINEAR_MIPMAP_LINEAR: number;
-    readonly LINEAR_MIPMAP_NEAREST: number;
-    readonly LINES: number;
-    readonly LINE_LOOP: number;
-    readonly LINE_STRIP: number;
-    readonly LINE_WIDTH: number;
-    readonly LINK_STATUS: number;
-    readonly LOW_FLOAT: number;
-    readonly LOW_INT: number;
-    readonly LUMINANCE: number;
-    readonly LUMINANCE_ALPHA: number;
-    readonly MAX_COMBINED_TEXTURE_IMAGE_UNITS: number;
-    readonly MAX_CUBE_MAP_TEXTURE_SIZE: number;
-    readonly MAX_FRAGMENT_UNIFORM_VECTORS: number;
-    readonly MAX_RENDERBUFFER_SIZE: number;
-    readonly MAX_TEXTURE_IMAGE_UNITS: number;
-    readonly MAX_TEXTURE_SIZE: number;
-    readonly MAX_VARYING_VECTORS: number;
-    readonly MAX_VERTEX_ATTRIBS: number;
-    readonly MAX_VERTEX_TEXTURE_IMAGE_UNITS: number;
-    readonly MAX_VERTEX_UNIFORM_VECTORS: number;
-    readonly MAX_VIEWPORT_DIMS: number;
-    readonly MEDIUM_FLOAT: number;
-    readonly MEDIUM_INT: number;
-    readonly MIRRORED_REPEAT: number;
-    readonly NEAREST: number;
-    readonly NEAREST_MIPMAP_LINEAR: number;
-    readonly NEAREST_MIPMAP_NEAREST: number;
-    readonly NEVER: number;
-    readonly NICEST: number;
-    readonly NONE: number;
-    readonly NOTEQUAL: number;
-    readonly NO_ERROR: number;
-    readonly ONE: number;
-    readonly ONE_MINUS_CONSTANT_ALPHA: number;
-    readonly ONE_MINUS_CONSTANT_COLOR: number;
-    readonly ONE_MINUS_DST_ALPHA: number;
-    readonly ONE_MINUS_DST_COLOR: number;
-    readonly ONE_MINUS_SRC_ALPHA: number;
-    readonly ONE_MINUS_SRC_COLOR: number;
-    readonly OUT_OF_MEMORY: number;
-    readonly PACK_ALIGNMENT: number;
-    readonly POINTS: number;
-    readonly POLYGON_OFFSET_FACTOR: number;
-    readonly POLYGON_OFFSET_FILL: number;
-    readonly POLYGON_OFFSET_UNITS: number;
-    readonly RED_BITS: number;
-    readonly RENDERBUFFER: number;
-    readonly RENDERBUFFER_ALPHA_SIZE: number;
-    readonly RENDERBUFFER_BINDING: number;
-    readonly RENDERBUFFER_BLUE_SIZE: number;
-    readonly RENDERBUFFER_DEPTH_SIZE: number;
-    readonly RENDERBUFFER_GREEN_SIZE: number;
-    readonly RENDERBUFFER_HEIGHT: number;
-    readonly RENDERBUFFER_INTERNAL_FORMAT: number;
-    readonly RENDERBUFFER_RED_SIZE: number;
-    readonly RENDERBUFFER_STENCIL_SIZE: number;
-    readonly RENDERBUFFER_WIDTH: number;
-    readonly RENDERER: number;
-    readonly REPEAT: number;
-    readonly REPLACE: number;
-    readonly RGB: number;
-    readonly RGB565: number;
-    readonly RGB5_A1: number;
-    readonly RGBA: number;
-    readonly RGBA4: number;
-    readonly SAMPLER_2D: number;
-    readonly SAMPLER_CUBE: number;
-    readonly SAMPLES: number;
-    readonly SAMPLE_ALPHA_TO_COVERAGE: number;
-    readonly SAMPLE_BUFFERS: number;
-    readonly SAMPLE_COVERAGE: number;
-    readonly SAMPLE_COVERAGE_INVERT: number;
-    readonly SAMPLE_COVERAGE_VALUE: number;
-    readonly SCISSOR_BOX: number;
-    readonly SCISSOR_TEST: number;
-    readonly SHADER_TYPE: number;
-    readonly SHADING_LANGUAGE_VERSION: number;
-    readonly SHORT: number;
-    readonly SRC_ALPHA: number;
-    readonly SRC_ALPHA_SATURATE: number;
-    readonly SRC_COLOR: number;
-    readonly STATIC_DRAW: number;
-    readonly STENCIL_ATTACHMENT: number;
-    readonly STENCIL_BACK_FAIL: number;
-    readonly STENCIL_BACK_FUNC: number;
-    readonly STENCIL_BACK_PASS_DEPTH_FAIL: number;
-    readonly STENCIL_BACK_PASS_DEPTH_PASS: number;
-    readonly STENCIL_BACK_REF: number;
-    readonly STENCIL_BACK_VALUE_MASK: number;
-    readonly STENCIL_BACK_WRITEMASK: number;
-    readonly STENCIL_BITS: number;
-    readonly STENCIL_BUFFER_BIT: number;
-    readonly STENCIL_CLEAR_VALUE: number;
-    readonly STENCIL_FAIL: number;
-    readonly STENCIL_FUNC: number;
-    readonly STENCIL_INDEX: number;
-    readonly STENCIL_INDEX8: number;
-    readonly STENCIL_PASS_DEPTH_FAIL: number;
-    readonly STENCIL_PASS_DEPTH_PASS: number;
-    readonly STENCIL_REF: number;
-    readonly STENCIL_TEST: number;
-    readonly STENCIL_VALUE_MASK: number;
-    readonly STENCIL_WRITEMASK: number;
-    readonly STREAM_DRAW: number;
-    readonly SUBPIXEL_BITS: number;
-    readonly TEXTURE: number;
-    readonly TEXTURE0: number;
-    readonly TEXTURE1: number;
-    readonly TEXTURE10: number;
-    readonly TEXTURE11: number;
-    readonly TEXTURE12: number;
-    readonly TEXTURE13: number;
-    readonly TEXTURE14: number;
-    readonly TEXTURE15: number;
-    readonly TEXTURE16: number;
-    readonly TEXTURE17: number;
-    readonly TEXTURE18: number;
-    readonly TEXTURE19: number;
-    readonly TEXTURE2: number;
-    readonly TEXTURE20: number;
-    readonly TEXTURE21: number;
-    readonly TEXTURE22: number;
-    readonly TEXTURE23: number;
-    readonly TEXTURE24: number;
-    readonly TEXTURE25: number;
-    readonly TEXTURE26: number;
-    readonly TEXTURE27: number;
-    readonly TEXTURE28: number;
-    readonly TEXTURE29: number;
-    readonly TEXTURE3: number;
-    readonly TEXTURE30: number;
-    readonly TEXTURE31: number;
-    readonly TEXTURE4: number;
-    readonly TEXTURE5: number;
-    readonly TEXTURE6: number;
-    readonly TEXTURE7: number;
-    readonly TEXTURE8: number;
-    readonly TEXTURE9: number;
-    readonly TEXTURE_2D: number;
-    readonly TEXTURE_BINDING_2D: number;
-    readonly TEXTURE_BINDING_CUBE_MAP: number;
-    readonly TEXTURE_CUBE_MAP: number;
-    readonly TEXTURE_CUBE_MAP_NEGATIVE_X: number;
-    readonly TEXTURE_CUBE_MAP_NEGATIVE_Y: number;
-    readonly TEXTURE_CUBE_MAP_NEGATIVE_Z: number;
-    readonly TEXTURE_CUBE_MAP_POSITIVE_X: number;
-    readonly TEXTURE_CUBE_MAP_POSITIVE_Y: number;
-    readonly TEXTURE_CUBE_MAP_POSITIVE_Z: number;
-    readonly TEXTURE_MAG_FILTER: number;
-    readonly TEXTURE_MIN_FILTER: number;
-    readonly TEXTURE_WRAP_S: number;
-    readonly TEXTURE_WRAP_T: number;
-    readonly TRIANGLES: number;
-    readonly TRIANGLE_FAN: number;
-    readonly TRIANGLE_STRIP: number;
-    readonly UNPACK_ALIGNMENT: number;
-    readonly UNPACK_COLORSPACE_CONVERSION_WEBGL: number;
-    readonly UNPACK_FLIP_Y_WEBGL: number;
-    readonly UNPACK_PREMULTIPLY_ALPHA_WEBGL: number;
-    readonly UNSIGNED_BYTE: number;
-    readonly UNSIGNED_INT: number;
-    readonly UNSIGNED_SHORT: number;
-    readonly UNSIGNED_SHORT_4_4_4_4: number;
-    readonly UNSIGNED_SHORT_5_5_5_1: number;
-    readonly UNSIGNED_SHORT_5_6_5: number;
-    readonly VALIDATE_STATUS: number;
-    readonly VENDOR: number;
-    readonly VERSION: number;
-    readonly VERTEX_ATTRIB_ARRAY_BUFFER_BINDING: number;
-    readonly VERTEX_ATTRIB_ARRAY_ENABLED: number;
-    readonly VERTEX_ATTRIB_ARRAY_NORMALIZED: number;
-    readonly VERTEX_ATTRIB_ARRAY_POINTER: number;
-    readonly VERTEX_ATTRIB_ARRAY_SIZE: number;
-    readonly VERTEX_ATTRIB_ARRAY_STRIDE: number;
-    readonly VERTEX_ATTRIB_ARRAY_TYPE: number;
-    readonly VERTEX_SHADER: number;
-    readonly VIEWPORT: number;
-    readonly ZERO: number;
-};
-
-interface WebGLShader extends WebGLObject {
-}
-
-declare var WebGLShader: {
-    prototype: WebGLShader;
-    new(): WebGLShader;
-};
-
-interface WebGLShaderPrecisionFormat {
-    readonly precision: number;
-    readonly rangeMax: number;
-    readonly rangeMin: number;
-}
-
-declare var WebGLShaderPrecisionFormat: {
-    prototype: WebGLShaderPrecisionFormat;
-    new(): WebGLShaderPrecisionFormat;
-};
-
-interface WebGLTexture extends WebGLObject {
-}
-
-declare var WebGLTexture: {
-    prototype: WebGLTexture;
-    new(): WebGLTexture;
-};
-
-interface WebGLUniformLocation {
-}
-
-declare var WebGLUniformLocation: {
-    prototype: WebGLUniformLocation;
-    new(): WebGLUniformLocation;
-};
-
-interface WebGLVertexArrayObjectOES {
-}
-
-interface WebKitCSSMatrix {
-    a: number;
-    b: number;
-    c: number;
-    d: number;
-    e: number;
-    f: number;
-    m11: number;
-    m12: number;
-    m13: number;
-    m14: number;
-    m21: number;
-    m22: number;
-    m23: number;
-    m24: number;
-    m31: number;
-    m32: number;
-    m33: number;
-    m34: number;
-    m41: number;
-    m42: number;
-    m43: number;
-    m44: number;
-    inverse(): WebKitCSSMatrix;
-    multiply(secondMatrix: WebKitCSSMatrix): WebKitCSSMatrix;
-    rotate(angleX: number, angleY?: number, angleZ?: number): WebKitCSSMatrix;
-    rotateAxisAngle(x: number, y: number, z: number, angle: number): WebKitCSSMatrix;
-    scale(scaleX: number, scaleY?: number, scaleZ?: number): WebKitCSSMatrix;
-    setMatrixValue(value: string): void;
-    skewX(angle: number): WebKitCSSMatrix;
-    skewY(angle: number): WebKitCSSMatrix;
-    toString(): string;
-    translate(x: number, y: number, z?: number): WebKitCSSMatrix;
-}
-
-declare var WebKitCSSMatrix: {
-    prototype: WebKitCSSMatrix;
-    new(text?: string): WebKitCSSMatrix;
-};
-
-interface WebKitDirectoryEntry extends WebKitEntry {
-    createReader(): WebKitDirectoryReader;
-}
-
-declare var WebKitDirectoryEntry: {
-    prototype: WebKitDirectoryEntry;
-    new(): WebKitDirectoryEntry;
-};
-
-interface WebKitDirectoryReader {
-    readEntries(successCallback: WebKitEntriesCallback, errorCallback?: WebKitErrorCallback): void;
-}
-
-declare var WebKitDirectoryReader: {
-    prototype: WebKitDirectoryReader;
-    new(): WebKitDirectoryReader;
-};
-
-interface WebKitEntry {
-    readonly filesystem: WebKitFileSystem;
-    readonly fullPath: string;
-    readonly isDirectory: boolean;
-    readonly isFile: boolean;
-    readonly name: string;
-}
-
-declare var WebKitEntry: {
-    prototype: WebKitEntry;
-    new(): WebKitEntry;
-};
-
-interface WebKitFileEntry extends WebKitEntry {
-    file(successCallback: WebKitFileCallback, errorCallback?: WebKitErrorCallback): void;
-}
-
-declare var WebKitFileEntry: {
-    prototype: WebKitFileEntry;
-    new(): WebKitFileEntry;
-};
-
-interface WebKitFileSystem {
-    readonly name: string;
-    readonly root: WebKitDirectoryEntry;
-}
-
-declare var WebKitFileSystem: {
-    prototype: WebKitFileSystem;
-    new(): WebKitFileSystem;
-};
-
-interface WebKitPoint {
-    x: number;
-    y: number;
-}
-
-declare var WebKitPoint: {
-    prototype: WebKitPoint;
-    new(x?: number, y?: number): WebKitPoint;
-};
-
-interface WebSocketEventMap {
-    "close": CloseEvent;
-    "error": Event;
-    "message": MessageEvent;
-    "open": Event;
-}
-
-interface WebSocket extends EventTarget {
-    binaryType: BinaryType;
-    readonly bufferedAmount: number;
-    readonly extensions: string;
-    onclose: ((this: WebSocket, ev: CloseEvent) => any) | null;
-    onerror: ((this: WebSocket, ev: Event) => any) | null;
-    onmessage: ((this: WebSocket, ev: MessageEvent) => any) | null;
-    onopen: ((this: WebSocket, ev: Event) => any) | null;
-    readonly protocol: string;
-    readonly readyState: number;
-    readonly url: string;
-    close(code?: number, reason?: string): void;
-    send(data: string | ArrayBufferLike | Blob | ArrayBufferView): void;
-    readonly CLOSED: number;
-    readonly CLOSING: number;
-    readonly CONNECTING: number;
-    readonly OPEN: number;
-    addEventListener<K extends keyof WebSocketEventMap>(type: K, listener: (this: WebSocket, ev: WebSocketEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof WebSocketEventMap>(type: K, listener: (this: WebSocket, ev: WebSocketEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var WebSocket: {
-    prototype: WebSocket;
-    new(url: string, protocols?: string | string[]): WebSocket;
-    readonly CLOSED: number;
-    readonly CLOSING: number;
-    readonly CONNECTING: number;
-    readonly OPEN: number;
-};
-
-interface WheelEvent extends MouseEvent {
-    readonly deltaMode: number;
-    readonly deltaX: number;
-    readonly deltaY: number;
-    readonly deltaZ: number;
-    readonly wheelDelta: number;
-    readonly wheelDeltaX: number;
-    readonly wheelDeltaY: number;
-    getCurrentPoint(element: Element): void;
-    initWheelEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number, screenXArg: number, screenYArg: number, clientXArg: number, clientYArg: number, buttonArg: number, relatedTargetArg: EventTarget, modifiersListArg: string, deltaXArg: number, deltaYArg: number, deltaZArg: number, deltaMode: number): void;
-    readonly DOM_DELTA_LINE: number;
-    readonly DOM_DELTA_PAGE: number;
-    readonly DOM_DELTA_PIXEL: number;
-}
-
-declare var WheelEvent: {
-    prototype: WheelEvent;
-    new(typeArg: string, eventInitDict?: WheelEventInit): WheelEvent;
-    readonly DOM_DELTA_LINE: number;
-    readonly DOM_DELTA_PAGE: number;
-    readonly DOM_DELTA_PIXEL: number;
-};
-
-interface WindowEventMap extends GlobalEventHandlersEventMap {
-    "abort": UIEvent;
-    "afterprint": Event;
-    "beforeprint": Event;
-    "beforeunload": BeforeUnloadEvent;
-    "blur": FocusEvent;
-    "canplay": Event;
-    "canplaythrough": Event;
-    "change": Event;
-    "click": MouseEvent;
-    "compassneedscalibration": Event;
-    "contextmenu": PointerEvent;
-    "dblclick": MouseEvent;
-    "devicelight": DeviceLightEvent;
-    "devicemotion": DeviceMotionEvent;
-    "deviceorientation": DeviceOrientationEvent;
-    "drag": DragEvent;
-    "dragend": DragEvent;
-    "dragenter": DragEvent;
-    "dragleave": DragEvent;
-    "dragover": DragEvent;
-    "dragstart": DragEvent;
-    "drop": DragEvent;
-    "durationchange": Event;
-    "emptied": Event;
-    "ended": Event;
-    "error": ErrorEvent;
-    "focus": FocusEvent;
-    "hashchange": HashChangeEvent;
-    "input": Event;
-    "invalid": Event;
-    "keydown": KeyboardEvent;
-    "keypress": KeyboardEvent;
-    "keyup": KeyboardEvent;
-    "load": Event;
-    "loadeddata": Event;
-    "loadedmetadata": Event;
-    "loadstart": Event;
-    "message": MessageEvent;
-    "mousedown": MouseEvent;
-    "mouseenter": MouseEvent;
-    "mouseleave": MouseEvent;
-    "mousemove": MouseEvent;
-    "mouseout": MouseEvent;
-    "mouseover": MouseEvent;
-    "mouseup": MouseEvent;
-    "mousewheel": WheelEvent;
-    "MSGestureChange": Event;
-    "MSGestureDoubleTap": Event;
-    "MSGestureEnd": Event;
-    "MSGestureHold": Event;
-    "MSGestureStart": Event;
-    "MSGestureTap": Event;
-    "MSInertiaStart": Event;
-    "MSPointerCancel": Event;
-    "MSPointerDown": Event;
-    "MSPointerEnter": Event;
-    "MSPointerLeave": Event;
-    "MSPointerMove": Event;
-    "MSPointerOut": Event;
-    "MSPointerOver": Event;
-    "MSPointerUp": Event;
-    "offline": Event;
-    "online": Event;
-    "orientationchange": Event;
-    "pagehide": PageTransitionEvent;
-    "pageshow": PageTransitionEvent;
-    "pause": Event;
-    "play": Event;
-    "playing": Event;
-    "popstate": PopStateEvent;
-    "progress": ProgressEvent;
-    "ratechange": Event;
-    "readystatechange": ProgressEvent;
-    "reset": Event;
-    "resize": UIEvent;
-    "scroll": UIEvent;
-    "seeked": Event;
-    "seeking": Event;
-    "select": UIEvent;
-    "stalled": Event;
-    "storage": StorageEvent;
-    "submit": Event;
-    "suspend": Event;
-    "timeupdate": Event;
-    "touchcancel": TouchEvent;
-    "touchend": TouchEvent;
-    "touchmove": TouchEvent;
-    "touchstart": TouchEvent;
-    "unload": Event;
-    "volumechange": Event;
-    "vrdisplayactivate": Event;
-    "vrdisplayblur": Event;
-    "vrdisplayconnect": Event;
-    "vrdisplaydeactivate": Event;
-    "vrdisplaydisconnect": Event;
-    "vrdisplayfocus": Event;
-    "vrdisplaypointerrestricted": Event;
-    "vrdisplaypointerunrestricted": Event;
-    "vrdisplaypresentchange": Event;
-    "waiting": Event;
-}
-
-interface Window extends EventTarget, WindowTimers, WindowSessionStorage, WindowLocalStorage, WindowConsole, GlobalEventHandlers, IDBEnvironment, WindowBase64, GlobalFetch {
-    Blob: typeof Blob;
-    URL: typeof URL;
-    URLSearchParams: typeof URLSearchParams;
-    readonly applicationCache: ApplicationCache;
-    readonly caches: CacheStorage;
-    readonly clientInformation: Navigator;
-    readonly closed: boolean;
-    readonly crypto: Crypto;
-    customElements: CustomElementRegistry;
-    defaultStatus: string;
-    readonly devicePixelRatio: number;
-    readonly doNotTrack: string;
-    readonly document: Document;
-    event: Event | undefined;
-    readonly external: External;
-    readonly frameElement: Element;
-    readonly frames: Window;
-    readonly history: History;
-    readonly innerHeight: number;
-    readonly innerWidth: number;
-    readonly isSecureContext: boolean;
-    readonly length: number;
-    location: Location;
-    readonly locationbar: BarProp;
-    readonly menubar: BarProp;
-    readonly msContentScript: ExtensionScriptApis;
-    readonly msCredentials: MSCredentials;
-    name: string;
-    readonly navigator: Navigator;
-    offscreenBuffering: string | boolean;
-    onabort: ((this: Window, ev: UIEvent) => any) | null;
-    onafterprint: ((this: Window, ev: Event) => any) | null;
-    onbeforeprint: ((this: Window, ev: Event) => any) | null;
-    onbeforeunload: ((this: Window, ev: BeforeUnloadEvent) => any) | null;
-    onblur: ((this: Window, ev: FocusEvent) => any) | null;
-    oncanplay: ((this: Window, ev: Event) => any) | null;
-    oncanplaythrough: ((this: Window, ev: Event) => any) | null;
-    onchange: ((this: Window, ev: Event) => any) | null;
-    onclick: ((this: Window, ev: MouseEvent) => any) | null;
-    oncompassneedscalibration: ((this: Window, ev: Event) => any) | null;
-    oncontextmenu: ((this: Window, ev: PointerEvent) => any) | null;
-    ondblclick: ((this: Window, ev: MouseEvent) => any) | null;
-    ondevicelight: ((this: Window, ev: DeviceLightEvent) => any) | null;
-    ondevicemotion: ((this: Window, ev: DeviceMotionEvent) => any) | null;
-    ondeviceorientation: ((this: Window, ev: DeviceOrientationEvent) => any) | null;
-    ondrag: ((this: Window, ev: DragEvent) => any) | null;
-    ondragend: ((this: Window, ev: DragEvent) => any) | null;
-    ondragenter: ((this: Window, ev: DragEvent) => any) | null;
-    ondragleave: ((this: Window, ev: DragEvent) => any) | null;
-    ondragover: ((this: Window, ev: DragEvent) => any) | null;
-    ondragstart: ((this: Window, ev: DragEvent) => any) | null;
-    ondrop: ((this: Window, ev: DragEvent) => any) | null;
-    ondurationchange: ((this: Window, ev: Event) => any) | null;
-    onemptied: ((this: Window, ev: Event) => any) | null;
-    onended: ((this: Window, ev: Event) => any) | null;
-    onerror: ErrorEventHandler;
-    onfocus: ((this: Window, ev: FocusEvent) => any) | null;
-    onhashchange: ((this: Window, ev: HashChangeEvent) => any) | null;
-    oninput: ((this: Window, ev: Event) => any) | null;
-    oninvalid: ((this: Window, ev: Event) => any) | null;
-    onkeydown: ((this: Window, ev: KeyboardEvent) => any) | null;
-    onkeypress: ((this: Window, ev: KeyboardEvent) => any) | null;
-    onkeyup: ((this: Window, ev: KeyboardEvent) => any) | null;
-    onload: ((this: Window, ev: Event) => any) | null;
-    onloadeddata: ((this: Window, ev: Event) => any) | null;
-    onloadedmetadata: ((this: Window, ev: Event) => any) | null;
-    onloadstart: ((this: Window, ev: Event) => any) | null;
-    onmessage: ((this: Window, ev: MessageEvent) => any) | null;
-    onmousedown: ((this: Window, ev: MouseEvent) => any) | null;
-    onmouseenter: ((this: Window, ev: MouseEvent) => any) | null;
-    onmouseleave: ((this: Window, ev: MouseEvent) => any) | null;
-    onmousemove: ((this: Window, ev: MouseEvent) => any) | null;
-    onmouseout: ((this: Window, ev: MouseEvent) => any) | null;
-    onmouseover: ((this: Window, ev: MouseEvent) => any) | null;
-    onmouseup: ((this: Window, ev: MouseEvent) => any) | null;
-    onmousewheel: ((this: Window, ev: WheelEvent) => any) | null;
-    onmsgesturechange: ((this: Window, ev: Event) => any) | null;
-    onmsgesturedoubletap: ((this: Window, ev: Event) => any) | null;
-    onmsgestureend: ((this: Window, ev: Event) => any) | null;
-    onmsgesturehold: ((this: Window, ev: Event) => any) | null;
-    onmsgesturestart: ((this: Window, ev: Event) => any) | null;
-    onmsgesturetap: ((this: Window, ev: Event) => any) | null;
-    onmsinertiastart: ((this: Window, ev: Event) => any) | null;
-    onmspointercancel: ((this: Window, ev: Event) => any) | null;
-    onmspointerdown: ((this: Window, ev: Event) => any) | null;
-    onmspointerenter: ((this: Window, ev: Event) => any) | null;
-    onmspointerleave: ((this: Window, ev: Event) => any) | null;
-    onmspointermove: ((this: Window, ev: Event) => any) | null;
-    onmspointerout: ((this: Window, ev: Event) => any) | null;
-    onmspointerover: ((this: Window, ev: Event) => any) | null;
-    onmspointerup: ((this: Window, ev: Event) => any) | null;
-    onoffline: ((this: Window, ev: Event) => any) | null;
-    ononline: ((this: Window, ev: Event) => any) | null;
-    onorientationchange: ((this: Window, ev: Event) => any) | null;
-    onpagehide: ((this: Window, ev: PageTransitionEvent) => any) | null;
-    onpageshow: ((this: Window, ev: PageTransitionEvent) => any) | null;
-    onpause: ((this: Window, ev: Event) => any) | null;
-    onplay: ((this: Window, ev: Event) => any) | null;
-    onplaying: ((this: Window, ev: Event) => any) | null;
-    onpopstate: ((this: Window, ev: PopStateEvent) => any) | null;
-    onprogress: ((this: Window, ev: ProgressEvent) => any) | null;
-    onratechange: ((this: Window, ev: Event) => any) | null;
-    onreadystatechange: ((this: Window, ev: ProgressEvent) => any) | null;
-    onreset: ((this: Window, ev: Event) => any) | null;
-    onresize: ((this: Window, ev: UIEvent) => any) | null;
-    onscroll: ((this: Window, ev: UIEvent) => any) | null;
-    onseeked: ((this: Window, ev: Event) => any) | null;
-    onseeking: ((this: Window, ev: Event) => any) | null;
-    onselect: ((this: Window, ev: UIEvent) => any) | null;
-    onstalled: ((this: Window, ev: Event) => any) | null;
-    onstorage: ((this: Window, ev: StorageEvent) => any) | null;
-    onsubmit: ((this: Window, ev: Event) => any) | null;
-    onsuspend: ((this: Window, ev: Event) => any) | null;
-    ontimeupdate: ((this: Window, ev: Event) => any) | null;
-    ontouchcancel: (ev: TouchEvent) => any;
-    ontouchend: (ev: TouchEvent) => any;
-    ontouchmove: (ev: TouchEvent) => any;
-    ontouchstart: (ev: TouchEvent) => any;
-    onunload: ((this: Window, ev: Event) => any) | null;
-    onvolumechange: ((this: Window, ev: Event) => any) | null;
-    onvrdisplayactivate: ((this: Window, ev: Event) => any) | null;
-    onvrdisplayblur: ((this: Window, ev: Event) => any) | null;
-    onvrdisplayconnect: ((this: Window, ev: Event) => any) | null;
-    onvrdisplaydeactivate: ((this: Window, ev: Event) => any) | null;
-    onvrdisplaydisconnect: ((this: Window, ev: Event) => any) | null;
-    onvrdisplayfocus: ((this: Window, ev: Event) => any) | null;
-    onvrdisplaypointerrestricted: ((this: Window, ev: Event) => any) | null;
-    onvrdisplaypointerunrestricted: ((this: Window, ev: Event) => any) | null;
-    onvrdisplaypresentchange: ((this: Window, ev: Event) => any) | null;
-    onwaiting: ((this: Window, ev: Event) => any) | null;
-    opener: any;
-    readonly orientation: string | number;
-    readonly outerHeight: number;
-    readonly outerWidth: number;
-    readonly pageXOffset: number;
-    readonly pageYOffset: number;
-    readonly parent: Window;
-    readonly performance: Performance;
-    readonly personalbar: BarProp;
-    readonly screen: Screen;
-    readonly screenLeft: number;
-    readonly screenTop: number;
-    readonly screenX: number;
-    readonly screenY: number;
-    readonly scrollX: number;
-    readonly scrollY: number;
-    readonly scrollbars: BarProp;
-    readonly self: Window;
-    readonly speechSynthesis: SpeechSynthesis;
-    status: string;
-    readonly statusbar: BarProp;
-    readonly styleMedia: StyleMedia;
-    readonly toolbar: BarProp;
-    readonly top: Window;
-    readonly window: Window;
-    alert(message?: any): void;
-    blur(): void;
-    cancelAnimationFrame(handle: number): void;
-    captureEvents(): void;
-    close(): void;
-    confirm(message?: string): boolean;
-    createImageBitmap(image: HTMLImageElement | SVGImageElement | HTMLVideoElement | HTMLCanvasElement | ImageBitmap | ImageData | Blob, options?: ImageBitmapOptions): Promise<ImageBitmap>;
-    createImageBitmap(image: HTMLImageElement | SVGImageElement | HTMLVideoElement | HTMLCanvasElement | ImageBitmap | ImageData | Blob, sx: number, sy: number, sw: number, sh: number, options?: ImageBitmapOptions): Promise<ImageBitmap>;
-    departFocus(navigationReason: NavigationReason, origin: FocusNavigationOrigin): void;
-    focus(): void;
-    getComputedStyle(elt: Element, pseudoElt?: string | null): CSSStyleDeclaration;
-    getMatchedCSSRules(elt: Element, pseudoElt?: string | null): CSSRuleList;
-    getSelection(): Selection;
-    matchMedia(mediaQuery: string): MediaQueryList;
-    moveBy(x?: number, y?: number): void;
-    moveTo(x?: number, y?: number): void;
-    msWriteProfilerMark(profilerMarkName: string): void;
-    open(url?: string, target?: string, features?: string, replace?: boolean): Window | null;
-    postMessage(message: any, targetOrigin: string, transfer?: any[]): void;
-    print(): void;
-    prompt(message?: string, _default?: string): string | null;
-    releaseEvents(): void;
-    requestAnimationFrame(callback: FrameRequestCallback): number;
-    resizeBy(x?: number, y?: number): void;
-    resizeTo(x?: number, y?: number): void;
-    scroll(options?: ScrollToOptions): void;
-    scroll(x?: number, y?: number): void;
-    scrollBy(options?: ScrollToOptions): void;
-    scrollBy(x?: number, y?: number): void;
-    scrollTo(options?: ScrollToOptions): void;
-    scrollTo(x?: number, y?: number): void;
-    stop(): void;
-    webkitCancelAnimationFrame(handle: number): void;
-    webkitConvertPointFromNodeToPage(node: Node, pt: WebKitPoint): WebKitPoint;
-    webkitConvertPointFromPageToNode(node: Node, pt: WebKitPoint): WebKitPoint;
-    webkitRequestAnimationFrame(callback: FrameRequestCallback): number;
-    addEventListener<K extends keyof WindowEventMap>(type: K, listener: (this: Window, ev: WindowEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof WindowEventMap>(type: K, listener: (this: Window, ev: WindowEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var Window: {
-    prototype: Window;
-    new(): Window;
-};
-
-interface WindowBase64 {
-    atob(encodedString: string): string;
-    btoa(rawString: string): string;
-}
-
-interface WindowConsole {
-    readonly console: Console;
-}
-
-interface WindowEventHandlersEventMap {
-    "afterprint": Event;
-    "beforeprint": Event;
-    "beforeunload": BeforeUnloadEvent;
-    "hashchange": HashChangeEvent;
-    "message": MessageEvent;
-    "offline": Event;
-    "online": Event;
-    "pagehide": PageTransitionEvent;
-    "pageshow": PageTransitionEvent;
-    "popstate": PopStateEvent;
-    "storage": StorageEvent;
-    "unload": Event;
-}
-
-interface WindowEventHandlers {
-    onafterprint: ((this: WindowEventHandlers, ev: Event) => any) | null;
-    onbeforeprint: ((this: WindowEventHandlers, ev: Event) => any) | null;
-    onbeforeunload: ((this: WindowEventHandlers, ev: BeforeUnloadEvent) => any) | null;
-    onhashchange: ((this: WindowEventHandlers, ev: HashChangeEvent) => any) | null;
-    onmessage: ((this: WindowEventHandlers, ev: MessageEvent) => any) | null;
-    onoffline: ((this: WindowEventHandlers, ev: Event) => any) | null;
-    ononline: ((this: WindowEventHandlers, ev: Event) => any) | null;
-    onpagehide: ((this: WindowEventHandlers, ev: PageTransitionEvent) => any) | null;
-    onpageshow: ((this: WindowEventHandlers, ev: PageTransitionEvent) => any) | null;
-    onpopstate: ((this: WindowEventHandlers, ev: PopStateEvent) => any) | null;
-    onstorage: ((this: WindowEventHandlers, ev: StorageEvent) => any) | null;
-    onunload: ((this: WindowEventHandlers, ev: Event) => any) | null;
-    addEventListener<K extends keyof WindowEventHandlersEventMap>(type: K, listener: (this: WindowEventHandlers, ev: WindowEventHandlersEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof WindowEventHandlersEventMap>(type: K, listener: (this: WindowEventHandlers, ev: WindowEventHandlersEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-interface WindowLocalStorage {
-    readonly localStorage: Storage;
-}
-
-interface WindowSessionStorage {
-    readonly sessionStorage: Storage;
-}
-
-interface WindowTimers extends WindowTimersExtension {
-    clearInterval(handle?: number): void;
-    clearTimeout(handle?: number): void;
-    setInterval(handler: (...args: any[]) => void, timeout: number): number;
-    setInterval(handler: any, timeout?: any, ...args: any[]): number;
-    setTimeout(handler: (...args: any[]) => void, timeout: number): number;
-    setTimeout(handler: any, timeout?: any, ...args: any[]): number;
-}
-
-interface WindowTimersExtension {
-    clearImmediate(handle: number): void;
-    setImmediate(handler: (...args: any[]) => void): number;
-    setImmediate(handler: any, ...args: any[]): number;
-}
-
-interface WorkerEventMap extends AbstractWorkerEventMap {
-    "message": MessageEvent;
-}
-
-interface Worker extends EventTarget, AbstractWorker {
-    onmessage: ((this: Worker, ev: MessageEvent) => any) | null;
-    /** @deprecated */
-    postMessage(message: any, transfer?: any[]): void;
-    terminate(): void;
-    addEventListener<K extends keyof WorkerEventMap>(type: K, listener: (this: Worker, ev: WorkerEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof WorkerEventMap>(type: K, listener: (this: Worker, ev: WorkerEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var Worker: {
-    prototype: Worker;
-    new(stringUrl: string): Worker;
-};
-
-interface WritableStream {
-    readonly locked: boolean;
-    abort(reason?: any): Promise<void>;
-    getWriter(): WritableStreamDefaultWriter;
-}
-
-declare var WritableStream: {
-    prototype: WritableStream;
-    new(underlyingSink?: UnderlyingSink, strategy?: QueuingStrategy): WritableStream;
-};
-
-interface WritableStreamDefaultController {
-    error(error?: any): void;
-}
-
-declare var WritableStreamDefaultController: {
-    prototype: WritableStreamDefaultController;
-    new(): WritableStreamDefaultController;
-};
-
-interface WritableStreamDefaultWriter {
-    readonly closed: Promise<void>;
-    readonly desiredSize: number;
-    readonly ready: Promise<void>;
-    abort(reason?: any): Promise<void>;
-    close(): Promise<void>;
-    releaseLock(): void;
-    write(chunk?: any): Promise<any>;
-}
-
-declare var WritableStreamDefaultWriter: {
-    prototype: WritableStreamDefaultWriter;
-    new(): WritableStreamDefaultWriter;
-};
-
-interface XMLDocument extends Document {
-    addEventListener<K extends keyof DocumentEventMap>(type: K, listener: (this: XMLDocument, ev: DocumentEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof DocumentEventMap>(type: K, listener: (this: XMLDocument, ev: DocumentEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var XMLDocument: {
-    prototype: XMLDocument;
-    new(): XMLDocument;
-};
-
-interface XMLHttpRequestEventMap extends XMLHttpRequestEventTargetEventMap {
-    "readystatechange": Event;
-}
-
-interface XMLHttpRequest extends EventTarget, XMLHttpRequestEventTarget {
-    msCaching: string;
-    onreadystatechange: ((this: XMLHttpRequest, ev: Event) => any) | null;
-    readonly readyState: number;
-    readonly response: any;
-    readonly responseText: string;
-    responseType: XMLHttpRequestResponseType;
-    readonly responseURL: string;
-    readonly responseXML: Document | null;
-    readonly status: number;
-    readonly statusText: string;
-    timeout: number;
-    readonly upload: XMLHttpRequestUpload;
-    withCredentials: boolean;
-    abort(): void;
-    getAllResponseHeaders(): string;
-    getResponseHeader(header: string): string | null;
-    msCachingEnabled(): boolean;
-    open(method: string, url: string, async?: boolean, user?: string | null, password?: string | null): void;
-    overrideMimeType(mime: string): void;
-    send(data?: any): void;
-    setRequestHeader(header: string, value: string): void;
-    readonly DONE: number;
-    readonly HEADERS_RECEIVED: number;
-    readonly LOADING: number;
-    readonly OPENED: number;
-    readonly UNSENT: number;
-    addEventListener<K extends keyof XMLHttpRequestEventMap>(type: K, listener: (this: XMLHttpRequest, ev: XMLHttpRequestEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof XMLHttpRequestEventMap>(type: K, listener: (this: XMLHttpRequest, ev: XMLHttpRequestEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var XMLHttpRequest: {
-    prototype: XMLHttpRequest;
-    new(): XMLHttpRequest;
-    readonly DONE: number;
-    readonly HEADERS_RECEIVED: number;
-    readonly LOADING: number;
-    readonly OPENED: number;
-    readonly UNSENT: number;
-};
-
-interface XMLHttpRequestEventTargetEventMap {
-    "abort": Event;
-    "error": ErrorEvent;
-    "load": Event;
-    "loadend": ProgressEvent;
-    "loadstart": Event;
-    "progress": ProgressEvent;
-    "timeout": ProgressEvent;
-}
-
-interface XMLHttpRequestEventTarget {
-    onabort: ((this: XMLHttpRequest, ev: Event) => any) | null;
-    onerror: ((this: XMLHttpRequest, ev: ErrorEvent) => any) | null;
-    onload: ((this: XMLHttpRequest, ev: Event) => any) | null;
-    onloadend: ((this: XMLHttpRequest, ev: ProgressEvent) => any) | null;
-    onloadstart: ((this: XMLHttpRequest, ev: Event) => any) | null;
-    onprogress: ((this: XMLHttpRequest, ev: ProgressEvent) => any) | null;
-    ontimeout: ((this: XMLHttpRequest, ev: ProgressEvent) => any) | null;
-    addEventListener<K extends keyof XMLHttpRequestEventTargetEventMap>(type: K, listener: (this: XMLHttpRequestEventTarget, ev: XMLHttpRequestEventTargetEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof XMLHttpRequestEventTargetEventMap>(type: K, listener: (this: XMLHttpRequestEventTarget, ev: XMLHttpRequestEventTargetEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-interface XMLHttpRequestUpload extends EventTarget, XMLHttpRequestEventTarget {
-    addEventListener<K extends keyof XMLHttpRequestEventTargetEventMap>(type: K, listener: (this: XMLHttpRequestUpload, ev: XMLHttpRequestEventTargetEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof XMLHttpRequestEventTargetEventMap>(type: K, listener: (this: XMLHttpRequestUpload, ev: XMLHttpRequestEventTargetEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var XMLHttpRequestUpload: {
-    prototype: XMLHttpRequestUpload;
-    new(): XMLHttpRequestUpload;
-};
-
-interface XMLSerializer {
-    serializeToString(target: Node): string;
-}
-
-declare var XMLSerializer: {
-    prototype: XMLSerializer;
-    new(): XMLSerializer;
-};
-
-interface XPathEvaluator {
-    createExpression(expression: string, resolver: XPathNSResolver): XPathExpression;
-    createNSResolver(nodeResolver?: Node): XPathNSResolver;
-    evaluate(expression: string, contextNode: Node, resolver: XPathNSResolver | null, type: number, result: XPathResult | null): XPathResult;
-}
-
-declare var XPathEvaluator: {
-    prototype: XPathEvaluator;
-    new(): XPathEvaluator;
-};
-
-interface XPathExpression {
-    evaluate(contextNode: Node, type: number, result: XPathResult | null): XPathResult;
-}
-
-declare var XPathExpression: {
-    prototype: XPathExpression;
-    new(): XPathExpression;
-};
-
-interface XPathNSResolver {
-    lookupNamespaceURI(prefix: string): string;
-}
-
-declare var XPathNSResolver: {
-    prototype: XPathNSResolver;
-    new(): XPathNSResolver;
-};
-
-interface XPathResult {
-    readonly booleanValue: boolean;
-    readonly invalidIteratorState: boolean;
-    readonly numberValue: number;
-    readonly resultType: number;
-    readonly singleNodeValue: Node;
-    readonly snapshotLength: number;
-    readonly stringValue: string;
-    iterateNext(): Node;
-    snapshotItem(index: number): Node;
-    readonly ANY_TYPE: number;
-    readonly ANY_UNORDERED_NODE_TYPE: number;
-    readonly BOOLEAN_TYPE: number;
-    readonly FIRST_ORDERED_NODE_TYPE: number;
-    readonly NUMBER_TYPE: number;
-    readonly ORDERED_NODE_ITERATOR_TYPE: number;
-    readonly ORDERED_NODE_SNAPSHOT_TYPE: number;
-    readonly STRING_TYPE: number;
-    readonly UNORDERED_NODE_ITERATOR_TYPE: number;
-    readonly UNORDERED_NODE_SNAPSHOT_TYPE: number;
-}
-
-declare var XPathResult: {
-    prototype: XPathResult;
-    new(): XPathResult;
-    readonly ANY_TYPE: number;
-    readonly ANY_UNORDERED_NODE_TYPE: number;
-    readonly BOOLEAN_TYPE: number;
-    readonly FIRST_ORDERED_NODE_TYPE: number;
-    readonly NUMBER_TYPE: number;
-    readonly ORDERED_NODE_ITERATOR_TYPE: number;
-    readonly ORDERED_NODE_SNAPSHOT_TYPE: number;
-    readonly STRING_TYPE: number;
-    readonly UNORDERED_NODE_ITERATOR_TYPE: number;
-    readonly UNORDERED_NODE_SNAPSHOT_TYPE: number;
-};
-
-interface XSLTProcessor {
-    clearParameters(): void;
-    getParameter(namespaceURI: string, localName: string): any;
-    importStylesheet(style: Node): void;
-    removeParameter(namespaceURI: string, localName: string): void;
-    reset(): void;
-    setParameter(namespaceURI: string, localName: string, value: any): void;
-    transformToDocument(source: Node): Document;
-    transformToFragment(source: Node, document: Document): DocumentFragment;
-}
-
-declare var XSLTProcessor: {
-    prototype: XSLTProcessor;
-    new(): XSLTProcessor;
-};
-
-interface webkitRTCPeerConnection extends RTCPeerConnection {
-    addEventListener<K extends keyof RTCPeerConnectionEventMap>(type: K, listener: (this: webkitRTCPeerConnection, ev: RTCPeerConnectionEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCPeerConnectionEventMap>(type: K, listener: (this: webkitRTCPeerConnection, ev: RTCPeerConnectionEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var webkitRTCPeerConnection: {
-    prototype: webkitRTCPeerConnection;
-    new(configuration: RTCConfiguration): webkitRTCPeerConnection;
-};
-
-declare type EventListenerOrEventListenerObject = EventListener | EventListenerObject;
-
-interface DecodeErrorCallback {
-    (error: DOMException): void;
-}
-
-interface DecodeSuccessCallback {
-    (decodedData: AudioBuffer): void;
-}
-
-interface ErrorEventHandler {
-    (event: Event | string, source?: string, fileno?: number, columnNumber?: number, error?: Error): void;
-}
-
-interface EventHandlerNonNull {
-    (event: Event): any;
-}
-
-interface ForEachCallback {
-    (keyId: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null, status: MediaKeyStatus): void;
-}
-
-interface FrameRequestCallback {
-    (time: number): void;
-}
-
-interface FunctionStringCallback {
-    (data: string): void;
-}
-
-interface IntersectionObserverCallback {
-    (entries: IntersectionObserverEntry[], observer: IntersectionObserver): void;
-}
-
-interface MSLaunchUriCallback {
-    (): void;
-}
-
-interface MediaQueryListListener {
-    (mql: MediaQueryList): void;
-}
-
-interface MutationCallback {
-    (mutations: MutationRecord[], observer: MutationObserver): void;
-}
-
-interface NavigatorUserMediaErrorCallback {
-    (error: MediaStreamError): void;
-}
-
-interface NavigatorUserMediaSuccessCallback {
-    (stream: MediaStream): void;
-}
-
-interface NotificationPermissionCallback {
-    (permission: NotificationPermission): void;
-}
-
-interface PositionCallback {
-    (position: Position): void;
-}
-
-interface PositionErrorCallback {
-    (error: PositionError): void;
-}
-
-interface RTCPeerConnectionErrorCallback {
-    (error: DOMError): void;
-}
-
-interface RTCSessionDescriptionCallback {
-    (sdp: RTCSessionDescription): void;
-}
-
-interface RTCStatsCallback {
-    (report: RTCStatsReport): void;
-}
-
-interface VoidFunction {
-    (): void;
-}
-
-interface WritableStreamChunkCallback {
-    (chunk: any, controller: WritableStreamDefaultController): void;
-}
-
-interface WritableStreamDefaultControllerCallback {
-    (controller: WritableStreamDefaultController): void;
-}
-
-interface WritableStreamErrorCallback {
-    (reason: string): void;
-}
-
-interface HTMLElementTagNameMap {
-    "a": HTMLAnchorElement;
-    "abbr": HTMLElement;
-    "acronym": HTMLElement;
-    "address": HTMLElement;
-    "applet": HTMLAppletElement;
-    "area": HTMLAreaElement;
-    "article": HTMLElement;
-    "aside": HTMLElement;
-    "audio": HTMLAudioElement;
-    "b": HTMLElement;
-    "base": HTMLBaseElement;
-    "basefont": HTMLBaseFontElement;
-    "bdo": HTMLElement;
-    "big": HTMLElement;
-    "blockquote": HTMLQuoteElement;
-    "body": HTMLBodyElement;
-    "br": HTMLBRElement;
-    "button": HTMLButtonElement;
-    "canvas": HTMLCanvasElement;
-    "caption": HTMLTableCaptionElement;
-    "center": HTMLElement;
-    "cite": HTMLElement;
-    "code": HTMLElement;
-    "col": HTMLTableColElement;
-    "colgroup": HTMLTableColElement;
-    "data": HTMLDataElement;
-    "datalist": HTMLDataListElement;
-    "dd": HTMLElement;
-    "del": HTMLModElement;
-    "dfn": HTMLElement;
-    "dir": HTMLDirectoryElement;
-    "div": HTMLDivElement;
-    "dl": HTMLDListElement;
-    "dt": HTMLElement;
-    "em": HTMLElement;
-    "embed": HTMLEmbedElement;
-    "fieldset": HTMLFieldSetElement;
-    "figcaption": HTMLElement;
-    "figure": HTMLElement;
-    "font": HTMLFontElement;
-    "footer": HTMLElement;
-    "form": HTMLFormElement;
-    "frame": HTMLFrameElement;
-    "frameset": HTMLFrameSetElement;
-    "h1": HTMLHeadingElement;
-    "h2": HTMLHeadingElement;
-    "h3": HTMLHeadingElement;
-    "h4": HTMLHeadingElement;
-    "h5": HTMLHeadingElement;
-    "h6": HTMLHeadingElement;
-    "head": HTMLHeadElement;
-    "header": HTMLElement;
-    "hgroup": HTMLElement;
-    "hr": HTMLHRElement;
-    "html": HTMLHtmlElement;
-    "i": HTMLElement;
-    "iframe": HTMLIFrameElement;
-    "img": HTMLImageElement;
-    "input": HTMLInputElement;
-    "ins": HTMLModElement;
-    "isindex": HTMLUnknownElement;
-    "kbd": HTMLElement;
-    "keygen": HTMLElement;
-    "label": HTMLLabelElement;
-    "legend": HTMLLegendElement;
-    "li": HTMLLIElement;
-    "link": HTMLLinkElement;
-    "listing": HTMLPreElement;
-    "map": HTMLMapElement;
-    "mark": HTMLElement;
-    "marquee": HTMLMarqueeElement;
-    "menu": HTMLMenuElement;
-    "meta": HTMLMetaElement;
-    "meter": HTMLMeterElement;
-    "nav": HTMLElement;
-    "nextid": HTMLUnknownElement;
-    "nobr": HTMLElement;
-    "noframes": HTMLElement;
-    "noscript": HTMLElement;
-    "object": HTMLObjectElement;
-    "ol": HTMLOListElement;
-    "optgroup": HTMLOptGroupElement;
-    "option": HTMLOptionElement;
-    "output": HTMLOutputElement;
-    "p": HTMLParagraphElement;
-    "param": HTMLParamElement;
-    "picture": HTMLPictureElement;
-    "plaintext": HTMLElement;
-    "pre": HTMLPreElement;
-    "progress": HTMLProgressElement;
-    "q": HTMLQuoteElement;
-    "rt": HTMLElement;
-    "ruby": HTMLElement;
-    "s": HTMLElement;
-    "samp": HTMLElement;
-    "script": HTMLScriptElement;
-    "section": HTMLElement;
-    "select": HTMLSelectElement;
-    "slot": HTMLSlotElement;
-    "small": HTMLElement;
-    "source": HTMLSourceElement;
-    "span": HTMLSpanElement;
-    "strike": HTMLElement;
-    "strong": HTMLElement;
-    "style": HTMLStyleElement;
-    "sub": HTMLElement;
-    "sup": HTMLElement;
-    "table": HTMLTableElement;
-    "tbody": HTMLTableSectionElement;
-    "td": HTMLTableDataCellElement;
-    "template": HTMLTemplateElement;
-    "textarea": HTMLTextAreaElement;
-    "tfoot": HTMLTableSectionElement;
-    "th": HTMLTableHeaderCellElement;
-    "thead": HTMLTableSectionElement;
-    "time": HTMLTimeElement;
-    "title": HTMLTitleElement;
-    "tr": HTMLTableRowElement;
-    "track": HTMLTrackElement;
-    "tt": HTMLElement;
-    "u": HTMLElement;
-    "ul": HTMLUListElement;
-    "var": HTMLElement;
-    "video": HTMLVideoElement;
-    "wbr": HTMLElement;
-    "xmp": HTMLPreElement;
-}
-
-interface SVGElementTagNameMap {
-    "circle": SVGCircleElement;
-    "clippath": SVGClipPathElement;
-    "defs": SVGDefsElement;
-    "desc": SVGDescElement;
-    "ellipse": SVGEllipseElement;
-    "feblend": SVGFEBlendElement;
-    "fecolormatrix": SVGFEColorMatrixElement;
-    "fecomponenttransfer": SVGFEComponentTransferElement;
-    "fecomposite": SVGFECompositeElement;
-    "feconvolvematrix": SVGFEConvolveMatrixElement;
-    "fediffuselighting": SVGFEDiffuseLightingElement;
-    "fedisplacementmap": SVGFEDisplacementMapElement;
-    "fedistantlight": SVGFEDistantLightElement;
-    "feflood": SVGFEFloodElement;
-    "fefunca": SVGFEFuncAElement;
-    "fefuncb": SVGFEFuncBElement;
-    "fefuncg": SVGFEFuncGElement;
-    "fefuncr": SVGFEFuncRElement;
-    "fegaussianblur": SVGFEGaussianBlurElement;
-    "feimage": SVGFEImageElement;
-    "femerge": SVGFEMergeElement;
-    "femergenode": SVGFEMergeNodeElement;
-    "femorphology": SVGFEMorphologyElement;
-    "feoffset": SVGFEOffsetElement;
-    "fepointlight": SVGFEPointLightElement;
-    "fespecularlighting": SVGFESpecularLightingElement;
-    "fespotlight": SVGFESpotLightElement;
-    "fetile": SVGFETileElement;
-    "feturbulence": SVGFETurbulenceElement;
-    "filter": SVGFilterElement;
-    "foreignobject": SVGForeignObjectElement;
-    "g": SVGGElement;
-    "image": SVGImageElement;
-    "line": SVGLineElement;
-    "lineargradient": SVGLinearGradientElement;
-    "marker": SVGMarkerElement;
-    "mask": SVGMaskElement;
-    "metadata": SVGMetadataElement;
-    "path": SVGPathElement;
-    "pattern": SVGPatternElement;
-    "polygon": SVGPolygonElement;
-    "polyline": SVGPolylineElement;
-    "radialgradient": SVGRadialGradientElement;
-    "rect": SVGRectElement;
-    "stop": SVGStopElement;
-    "svg": SVGSVGElement;
-    "switch": SVGSwitchElement;
-    "symbol": SVGSymbolElement;
-    "text": SVGTextElement;
-    "textpath": SVGTextPathElement;
-    "tspan": SVGTSpanElement;
-    "use": SVGUseElement;
-    "view": SVGViewElement;
-}
-
-/** @deprecated Directly use HTMLElementTagNameMap or SVGElementTagNameMap as appropriate, instead. */
-interface ElementTagNameMap extends HTMLElementTagNameMap, SVGElementTagNameMap { }
-
-declare var Audio: {
-    new(src?: string): HTMLAudioElement;
-};
-declare var Image: {
-    new(width?: number, height?: number): HTMLImageElement;
-};
-declare var Option: {
-    new(text?: string, value?: string, defaultSelected?: boolean, selected?: boolean): HTMLOptionElement;
-};
-declare var Blob: typeof Blob;
-declare var URL: typeof URL;
-declare var URLSearchParams: typeof URLSearchParams;
-declare var applicationCache: ApplicationCache;
-declare var caches: CacheStorage;
-declare var clientInformation: Navigator;
-declare var closed: boolean;
-declare var crypto: Crypto;
-declare var customElements: CustomElementRegistry;
-declare var defaultStatus: string;
-declare var devicePixelRatio: number;
-declare var doNotTrack: string;
-declare var document: Document;
-declare var event: Event | undefined;
-declare var external: External;
-declare var frameElement: Element;
-declare var frames: Window;
-declare var history: History;
-declare var innerHeight: number;
-declare var innerWidth: number;
-declare var isSecureContext: boolean;
-declare var length: number;
-declare var location: Location;
-declare var locationbar: BarProp;
-declare var menubar: BarProp;
-declare var msContentScript: ExtensionScriptApis;
-declare var msCredentials: MSCredentials;
-declare const name: never;
-declare var navigator: Navigator;
-declare var offscreenBuffering: string | boolean;
-declare var onabort: ((this: Window, ev: UIEvent) => any) | null;
-declare var onafterprint: ((this: Window, ev: Event) => any) | null;
-declare var onbeforeprint: ((this: Window, ev: Event) => any) | null;
-declare var onbeforeunload: ((this: Window, ev: BeforeUnloadEvent) => any) | null;
-declare var onblur: ((this: Window, ev: FocusEvent) => any) | null;
-declare var oncanplay: ((this: Window, ev: Event) => any) | null;
-declare var oncanplaythrough: ((this: Window, ev: Event) => any) | null;
-declare var onchange: ((this: Window, ev: Event) => any) | null;
-declare var onclick: ((this: Window, ev: MouseEvent) => any) | null;
-declare var oncompassneedscalibration: ((this: Window, ev: Event) => any) | null;
-declare var oncontextmenu: ((this: Window, ev: PointerEvent) => any) | null;
-declare var ondblclick: ((this: Window, ev: MouseEvent) => any) | null;
-declare var ondevicelight: ((this: Window, ev: DeviceLightEvent) => any) | null;
-declare var ondevicemotion: ((this: Window, ev: DeviceMotionEvent) => any) | null;
-declare var ondeviceorientation: ((this: Window, ev: DeviceOrientationEvent) => any) | null;
-declare var ondrag: ((this: Window, ev: DragEvent) => any) | null;
-declare var ondragend: ((this: Window, ev: DragEvent) => any) | null;
-declare var ondragenter: ((this: Window, ev: DragEvent) => any) | null;
-declare var ondragleave: ((this: Window, ev: DragEvent) => any) | null;
-declare var ondragover: ((this: Window, ev: DragEvent) => any) | null;
-declare var ondragstart: ((this: Window, ev: DragEvent) => any) | null;
-declare var ondrop: ((this: Window, ev: DragEvent) => any) | null;
-declare var ondurationchange: ((this: Window, ev: Event) => any) | null;
-declare var onemptied: ((this: Window, ev: Event) => any) | null;
-declare var onended: ((this: Window, ev: Event) => any) | null;
-declare var onerror: ErrorEventHandler;
-declare var onfocus: ((this: Window, ev: FocusEvent) => any) | null;
-declare var onhashchange: ((this: Window, ev: HashChangeEvent) => any) | null;
-declare var oninput: ((this: Window, ev: Event) => any) | null;
-declare var oninvalid: ((this: Window, ev: Event) => any) | null;
-declare var onkeydown: ((this: Window, ev: KeyboardEvent) => any) | null;
-declare var onkeypress: ((this: Window, ev: KeyboardEvent) => any) | null;
-declare var onkeyup: ((this: Window, ev: KeyboardEvent) => any) | null;
-declare var onload: ((this: Window, ev: Event) => any) | null;
-declare var onloadeddata: ((this: Window, ev: Event) => any) | null;
-declare var onloadedmetadata: ((this: Window, ev: Event) => any) | null;
-declare var onloadstart: ((this: Window, ev: Event) => any) | null;
-declare var onmessage: ((this: Window, ev: MessageEvent) => any) | null;
-declare var onmousedown: ((this: Window, ev: MouseEvent) => any) | null;
-declare var onmouseenter: ((this: Window, ev: MouseEvent) => any) | null;
-declare var onmouseleave: ((this: Window, ev: MouseEvent) => any) | null;
-declare var onmousemove: ((this: Window, ev: MouseEvent) => any) | null;
-declare var onmouseout: ((this: Window, ev: MouseEvent) => any) | null;
-declare var onmouseover: ((this: Window, ev: MouseEvent) => any) | null;
-declare var onmouseup: ((this: Window, ev: MouseEvent) => any) | null;
-declare var onmousewheel: ((this: Window, ev: WheelEvent) => any) | null;
-declare var onmsgesturechange: ((this: Window, ev: Event) => any) | null;
-declare var onmsgesturedoubletap: ((this: Window, ev: Event) => any) | null;
-declare var onmsgestureend: ((this: Window, ev: Event) => any) | null;
-declare var onmsgesturehold: ((this: Window, ev: Event) => any) | null;
-declare var onmsgesturestart: ((this: Window, ev: Event) => any) | null;
-declare var onmsgesturetap: ((this: Window, ev: Event) => any) | null;
-declare var onmsinertiastart: ((this: Window, ev: Event) => any) | null;
-declare var onmspointercancel: ((this: Window, ev: Event) => any) | null;
-declare var onmspointerdown: ((this: Window, ev: Event) => any) | null;
-declare var onmspointerenter: ((this: Window, ev: Event) => any) | null;
-declare var onmspointerleave: ((this: Window, ev: Event) => any) | null;
-declare var onmspointermove: ((this: Window, ev: Event) => any) | null;
-declare var onmspointerout: ((this: Window, ev: Event) => any) | null;
-declare var onmspointerover: ((this: Window, ev: Event) => any) | null;
-declare var onmspointerup: ((this: Window, ev: Event) => any) | null;
-declare var onoffline: ((this: Window, ev: Event) => any) | null;
-declare var ononline: ((this: Window, ev: Event) => any) | null;
-declare var onorientationchange: ((this: Window, ev: Event) => any) | null;
-declare var onpagehide: ((this: Window, ev: PageTransitionEvent) => any) | null;
-declare var onpageshow: ((this: Window, ev: PageTransitionEvent) => any) | null;
-declare var onpause: ((this: Window, ev: Event) => any) | null;
-declare var onplay: ((this: Window, ev: Event) => any) | null;
-declare var onplaying: ((this: Window, ev: Event) => any) | null;
-declare var onpopstate: ((this: Window, ev: PopStateEvent) => any) | null;
-declare var onprogress: ((this: Window, ev: ProgressEvent) => any) | null;
-declare var onratechange: ((this: Window, ev: Event) => any) | null;
-declare var onreadystatechange: ((this: Window, ev: ProgressEvent) => any) | null;
-declare var onreset: ((this: Window, ev: Event) => any) | null;
-declare var onresize: ((this: Window, ev: UIEvent) => any) | null;
-declare var onscroll: ((this: Window, ev: UIEvent) => any) | null;
-declare var onseeked: ((this: Window, ev: Event) => any) | null;
-declare var onseeking: ((this: Window, ev: Event) => any) | null;
-declare var onselect: ((this: Window, ev: UIEvent) => any) | null;
-declare var onstalled: ((this: Window, ev: Event) => any) | null;
-declare var onstorage: ((this: Window, ev: StorageEvent) => any) | null;
-declare var onsubmit: ((this: Window, ev: Event) => any) | null;
-declare var onsuspend: ((this: Window, ev: Event) => any) | null;
-declare var ontimeupdate: ((this: Window, ev: Event) => any) | null;
-declare var ontouchcancel: (ev: TouchEvent) => any;
-declare var ontouchend: (ev: TouchEvent) => any;
-declare var ontouchmove: (ev: TouchEvent) => any;
-declare var ontouchstart: (ev: TouchEvent) => any;
-declare var onunload: ((this: Window, ev: Event) => any) | null;
-declare var onvolumechange: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplayactivate: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplayblur: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplayconnect: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplaydeactivate: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplaydisconnect: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplayfocus: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplaypointerrestricted: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplaypointerunrestricted: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplaypresentchange: ((this: Window, ev: Event) => any) | null;
-declare var onwaiting: ((this: Window, ev: Event) => any) | null;
-declare var opener: any;
-declare var orientation: string | number;
-declare var outerHeight: number;
-declare var outerWidth: number;
-declare var pageXOffset: number;
-declare var pageYOffset: number;
-declare var parent: Window;
-declare var performance: Performance;
-declare var personalbar: BarProp;
-declare var screen: Screen;
-declare var screenLeft: number;
-declare var screenTop: number;
-declare var screenX: number;
-declare var screenY: number;
-declare var scrollX: number;
-declare var scrollY: number;
-declare var scrollbars: BarProp;
-declare var self: Window;
-declare var speechSynthesis: SpeechSynthesis;
-declare var status: string;
-declare var statusbar: BarProp;
-declare var styleMedia: StyleMedia;
-declare var toolbar: BarProp;
-declare var top: Window;
-declare var window: Window;
-declare function alert(message?: any): void;
-declare function blur(): void;
-declare function cancelAnimationFrame(handle: number): void;
-declare function captureEvents(): void;
-declare function close(): void;
-declare function confirm(message?: string): boolean;
-declare function createImageBitmap(image: HTMLImageElement | SVGImageElement | HTMLVideoElement | HTMLCanvasElement | ImageBitmap | ImageData | Blob, options?: ImageBitmapOptions): Promise<ImageBitmap>;
-declare function createImageBitmap(image: HTMLImageElement | SVGImageElement | HTMLVideoElement | HTMLCanvasElement | ImageBitmap | ImageData | Blob, sx: number, sy: number, sw: number, sh: number, options?: ImageBitmapOptions): Promise<ImageBitmap>;
-declare function departFocus(navigationReason: NavigationReason, origin: FocusNavigationOrigin): void;
-declare function focus(): void;
-declare function getComputedStyle(elt: Element, pseudoElt?: string | null): CSSStyleDeclaration;
-declare function getMatchedCSSRules(elt: Element, pseudoElt?: string | null): CSSRuleList;
-declare function getSelection(): Selection;
-declare function matchMedia(mediaQuery: string): MediaQueryList;
-declare function moveBy(x?: number, y?: number): void;
-declare function moveTo(x?: number, y?: number): void;
-declare function msWriteProfilerMark(profilerMarkName: string): void;
-declare function open(url?: string, target?: string, features?: string, replace?: boolean): Window | null;
-declare function postMessage(message: any, targetOrigin: string, transfer?: any[]): void;
-declare function print(): void;
-declare function prompt(message?: string, _default?: string): string | null;
-declare function releaseEvents(): void;
-declare function requestAnimationFrame(callback: FrameRequestCallback): number;
-declare function resizeBy(x?: number, y?: number): void;
-declare function resizeTo(x?: number, y?: number): void;
-declare function scroll(options?: ScrollToOptions): void;
-declare function scroll(x?: number, y?: number): void;
-declare function scrollBy(options?: ScrollToOptions): void;
-declare function scrollBy(x?: number, y?: number): void;
-declare function scrollTo(options?: ScrollToOptions): void;
-declare function scrollTo(x?: number, y?: number): void;
-declare function stop(): void;
-declare function webkitCancelAnimationFrame(handle: number): void;
-declare function webkitConvertPointFromNodeToPage(node: Node, pt: WebKitPoint): WebKitPoint;
-declare function webkitConvertPointFromPageToNode(node: Node, pt: WebKitPoint): WebKitPoint;
-declare function webkitRequestAnimationFrame(callback: FrameRequestCallback): number;
-declare function toString(): string;
-declare function dispatchEvent(evt: Event): boolean;
-declare function clearInterval(handle?: number): void;
-declare function clearTimeout(handle?: number): void;
-declare function setInterval(handler: (...args: any[]) => void, timeout: number): number;
-declare function setInterval(handler: any, timeout?: any, ...args: any[]): number;
-declare function setTimeout(handler: (...args: any[]) => void, timeout: number): number;
-declare function setTimeout(handler: any, timeout?: any, ...args: any[]): number;
-declare function clearImmediate(handle: number): void;
-declare function setImmediate(handler: (...args: any[]) => void): number;
-declare function setImmediate(handler: any, ...args: any[]): number;
-declare var sessionStorage: Storage;
-declare var localStorage: Storage;
-declare var console: Console;
-declare var onpointercancel: ((this: Window, ev: PointerEvent) => any) | null;
-declare var onpointerdown: ((this: Window, ev: PointerEvent) => any) | null;
-declare var onpointerenter: ((this: Window, ev: PointerEvent) => any) | null;
-declare var onpointerleave: ((this: Window, ev: PointerEvent) => any) | null;
-declare var onpointermove: ((this: Window, ev: PointerEvent) => any) | null;
-declare var onpointerout: ((this: Window, ev: PointerEvent) => any) | null;
-declare var onpointerover: ((this: Window, ev: PointerEvent) => any) | null;
-declare var onpointerup: ((this: Window, ev: PointerEvent) => any) | null;
-declare var onwheel: ((this: Window, ev: WheelEvent) => any) | null;
-declare var indexedDB: IDBFactory;
-declare function atob(encodedString: string): string;
-declare function btoa(rawString: string): string;
-declare function fetch(input?: Request | string, init?: RequestInit): Promise<Response>;
-declare function addEventListener<K extends keyof WindowEventMap>(type: K, listener: (this: Window, ev: WindowEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-declare function addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-declare function removeEventListener<K extends keyof WindowEventMap>(type: K, listener: (this: Window, ev: WindowEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-declare function removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-type ScrollBehavior = "auto" | "instant" | "smooth";
-type ScrollLogicalPosition = "start" | "center" | "end" | "nearest";
-type MouseWheelEvent = WheelEvent;
-type ScrollRestoration = "auto" | "manual";
-type FormDataEntryValue = string | File;
-type InsertPosition = "beforebegin" | "afterbegin" | "beforeend" | "afterend";
-type HeadersInit = Headers | string[][] | { [key: string]: string };
-type OrientationLockType = "any" | "natural" | "portrait" | "landscape" | "portrait-primary" | "portrait-secondary" | "landscape-primary"| "landscape-secondary";
-type IDBValidKey = number | string | Date | IDBArrayKey;
-type AlgorithmIdentifier = string | Algorithm;
-type MutationRecordType = "attributes" | "characterData" | "childList";
-type AAGUID = string;
-type BodyInit = any;
-type ByteString = string;
-type ConstrainBoolean = boolean | ConstrainBooleanParameters;
-type ConstrainDOMString = string | string[] | ConstrainDOMStringParameters;
-type ConstrainDouble = number | ConstrainDoubleRange;
-type ConstrainLong = number | ConstrainLongRange;
-type CryptoOperationData = ArrayBufferView;
-type GLbitfield = number;
-type GLboolean = boolean;
-type GLbyte = number;
-type GLclampf = number;
-type GLenum = number;
-type GLfloat = number;
-type GLint = number;
-type GLintptr = number;
-type GLshort = number;
-type GLsizei = number;
-type GLsizeiptr = number;
-type GLubyte = number;
-type GLuint = number;
-type GLushort = number;
-type IDBKeyPath = string;
-type MSInboundPayload = MSVideoRecvPayload | MSAudioRecvPayload;
-type MSLocalClientEvent = MSLocalClientEventBase | MSAudioLocalClientEvent;
-type MSOutboundPayload = MSVideoSendPayload | MSAudioSendPayload;
-type RTCIceGatherCandidate = RTCIceCandidateDictionary | RTCIceCandidateComplete;
-type RTCTransport = RTCDtlsTransport | RTCSrtpSdesTransport;
-type RequestInfo = Request | string;
-type USVString = string;
-type payloadtype = number;
-type BufferSource = ArrayBuffer | ArrayBufferView;
-type ClientTypes = "window" | "worker" | "sharedworker" | "all";
-type AppendMode = "segments" | "sequence";
-type AudioContextLatencyCategory = "balanced" | "interactive" | "playback";
-type AudioContextState = "suspended" | "running" | "closed";
-type BinaryType = "blob" | "arraybuffer";
-type BiquadFilterType = "lowpass" | "highpass" | "bandpass" | "lowshelf" | "highshelf" | "peaking" | "notch" | "allpass";
-type CanPlayTypeResult = "" | "maybe" | "probably";
-type CanvasFillRule = "nonzero" | "evenodd";
-type ChannelCountMode = "max" | "clamped-max" | "explicit";
-type ChannelInterpretation = "speakers" | "discrete";
-type DisplayCaptureSurfaceType = "monitor" | "window" | "application" | "browser";
-type DistanceModelType = "linear" | "inverse" | "exponential";
-type DocumentReadyState = "loading" | "interactive" | "complete";
-type EndOfStreamError = "network" | "decode";
-type ExpandGranularity = "character" | "word" | "sentence" | "textedit";
-type GamepadHand = "" | "left" | "right";
-type GamepadHapticActuatorType = "vibration";
-type GamepadInputEmulationType = "mouse" | "keyboard" | "gamepad";
-type GamepadMappingType = "" | "standard";
-type IDBCursorDirection = "next" | "nextunique" | "prev" | "prevunique";
-type IDBRequestReadyState = "pending" | "done";
-type IDBTransactionMode = "readonly" | "readwrite" | "versionchange";
-type KeyFormat = "raw" | "spki" | "pkcs8" | "jwk";
-type KeyType = "public" | "private" | "secret";
-type KeyUsage = "encrypt" | "decrypt" | "sign" | "verify" | "deriveKey" | "deriveBits" | "wrapKey" | "unwrapKey";
-type ListeningState = "inactive" | "active" | "disambiguation";
-type MSCredentialType = "FIDO_2_0";
-type MSIceAddrType = "os" | "stun" | "turn" | "peer-derived";
-type MSIceType = "failed" | "direct" | "relay";
-type MSStatsType = "description" | "localclientevent" | "inbound-network" | "outbound-network" | "inbound-payload" | "outbound-payload" | "transportdiagnostics";
-type MSTransportType = "Embedded" | "USB" | "NFC" | "BT";
-type MSWebViewPermissionState = "unknown" | "defer" | "allow" | "deny";
-type MSWebViewPermissionType = "geolocation" | "unlimitedIndexedDBQuota" | "media" | "pointerlock" | "webnotifications";
-type MediaDeviceKind = "audioinput" | "audiooutput" | "videoinput";
-type MediaKeyMessageType = "license-request" | "license-renewal" | "license-release" | "individualization-request";
-type MediaKeySessionType = "temporary" | "persistent-license" | "persistent-release-message";
-type MediaKeyStatus = "usable" | "expired" | "output-downscaled" | "output-not-allowed" | "status-pending" | "internal-error";
-type MediaKeysRequirement = "required" | "optional" | "not-allowed";
-type MediaStreamTrackState = "live" | "ended";
-type NavigationReason = "up" | "down" | "left" | "right";
-type NavigationType = "navigate" | "reload" | "back_forward" | "prerender";
-type NotificationDirection = "auto" | "ltr" | "rtl";
-type NotificationPermission = "default" | "denied" | "granted";
-type OscillatorType = "sine" | "square" | "sawtooth" | "triangle" | "custom";
-type OverSampleType = "none" | "2x" | "4x";
-type PanningModelType = "equalpower" | "HRTF";
-type PaymentComplete = "success" | "fail" | "unknown";
-type PaymentShippingType = "shipping" | "delivery" | "pickup";
-type PushEncryptionKeyName = "p256dh" | "auth";
-type PushPermissionState = "granted" | "denied" | "prompt";
-type RTCBundlePolicy = "balanced" | "max-compat" | "max-bundle";
-type RTCDegradationPreference = "maintain-framerate" | "maintain-resolution" | "balanced";
-type RTCDtlsRole = "auto" | "client" | "server";
-type RTCDtlsTransportState = "new" | "connecting" | "connected" | "closed";
-type RTCIceCandidateType = "host" | "srflx" | "prflx" | "relay";
-type RTCIceComponent = "RTP" | "RTCP";
-type RTCIceConnectionState = "new" | "checking" | "connected" | "completed" | "failed" | "disconnected" | "closed";
-type RTCIceGatherPolicy = "all" | "nohost" | "relay";
-type RTCIceGathererState = "new" | "gathering" | "complete";
-type RTCIceGatheringState = "new" | "gathering" | "complete";
-type RTCIceProtocol = "udp" | "tcp";
-type RTCIceRole = "controlling" | "controlled";
-type RTCIceTcpCandidateType = "active" | "passive" | "so";
-type RTCIceTransportPolicy = "none" | "relay" | "all";
-type RTCIceTransportState = "new" | "checking" | "connected" | "completed" | "disconnected" | "closed";
-type RTCSdpType = "offer" | "pranswer" | "answer";
-type RTCSignalingState = "stable" | "have-local-offer" | "have-remote-offer" | "have-local-pranswer" | "have-remote-pranswer" | "closed";
-type RTCStatsIceCandidatePairState = "frozen" | "waiting" | "inprogress" | "failed" | "succeeded" | "cancelled";
-type RTCStatsIceCandidateType = "host" | "serverreflexive" | "peerreflexive" | "relayed";
-type RTCStatsType = "inboundrtp" | "outboundrtp" | "session" | "datachannel" | "track" | "transport" | "candidatepair" | "localcandidate" | "remotecandidate";
-type ReadyState = "closed" | "open" | "ended";
-type ReferrerPolicy = "" | "no-referrer" | "no-referrer-when-downgrade" | "origin-only" | "origin-when-cross-origin" | "unsafe-url";
-type RequestCache = "default" | "no-store" | "reload" | "no-cache" | "force-cache";
-type RequestCredentials = "omit" | "same-origin" | "include";
-type RequestDestination = "" | "document" | "sharedworker" | "subresource" | "unknown" | "worker";
-type RequestMode = "navigate" | "same-origin" | "no-cors" | "cors";
-type RequestRedirect = "follow" | "error" | "manual";
-type RequestType = "" | "audio" | "font" | "image" | "script" | "style" | "track" | "video";
-type ResponseType = "basic" | "cors" | "default" | "error" | "opaque" | "opaqueredirect";
-type ScopedCredentialType = "ScopedCred";
-type ServiceWorkerState = "installing" | "installed" | "activating" | "activated" | "redundant";
-type TextTrackKind = "subtitles" | "captions" | "descriptions" | "chapters" | "metadata";
-type TextTrackMode = "disabled" | "hidden" | "showing";
-type Transport = "usb" | "nfc" | "ble";
-type VRDisplayEventReason = "mounted" | "navigation" | "requested" | "unmounted";
-type VREye = "left" | "right";
-type VideoFacingModeEnum = "user" | "environment" | "left" | "right";
-type VisibilityState = "hidden" | "visible" | "prerender" | "unloaded";
-type XMLHttpRequestResponseType = "" | "arraybuffer" | "blob" | "document" | "json" | "text";
-
-
-/////////////////////////////
-/// WorkerGlobalScope APIs
-/////////////////////////////
-// These are only available in a Web Worker
-declare function importScripts(...urls: string[]): void;
-
-
-
-
-/////////////////////////////
-/// Windows Script Host APIS
-/////////////////////////////
-
-
-interface ActiveXObject {
-    new (s: string): any;
-}
-declare var ActiveXObject: ActiveXObject;
-
-interface ITextWriter {
-    Write(s: string): void;
-    WriteLine(s: string): void;
-    Close(): void;
-}
-
-interface TextStreamBase {
-    /**
-     * The column number of the current character position in an input stream.
-     */
-    Column: number;
-
-    /**
-     * The current line number in an input stream.
-     */
-    Line: number;
-
-    /**
-     * Closes a text stream.
-     * It is not necessary to close standard streams; they close automatically when the process ends. If
-     * you close a standard stream, be aware that any other pointers to that standard stream become invalid.
-     */
-    Close(): void;
-}
-
-interface TextStreamWriter extends TextStreamBase {
-    /**
-     * Sends a string to an output stream.
-     */
-    Write(s: string): void;
-
-    /**
-     * Sends a specified number of blank lines (newline characters) to an output stream.
-     */
-    WriteBlankLines(intLines: number): void;
-
-    /**
-     * Sends a string followed by a newline character to an output stream.
-     */
-    WriteLine(s: string): void;
-}
-
-interface TextStreamReader extends TextStreamBase {
-    /**
-     * Returns a specified number of characters from an input stream, starting at the current pointer position.
-     * Does not return until the ENTER key is pressed.
-     * Can only be used on a stream in reading mode; causes an error in writing or appending mode.
-     */
-    Read(characters: number): string;
-
-    /**
-     * Returns all characters from an input stream.
-     * Can only be used on a stream in reading mode; causes an error in writing or appending mode.
-     */
-    ReadAll(): string;
-
-    /**
-     * Returns an entire line from an input stream.
-     * Although this method extracts the newline character, it does not add it to the returned string.
-     * Can only be used on a stream in reading mode; causes an error in writing or appending mode.
-     */
-    ReadLine(): string;
-
-    /**
-     * Skips a specified number of characters when reading from an input text stream.
-     * Can only be used on a stream in reading mode; causes an error in writing or appending mode.
-     * @param characters Positive number of characters to skip forward. (Backward skipping is not supported.)
-     */
-    Skip(characters: number): void;
-
-    /**
-     * Skips the next line when reading from an input text stream.
-     * Can only be used on a stream in reading mode, not writing or appending mode.
-     */
-    SkipLine(): void;
-
-    /**
-     * Indicates whether the stream pointer position is at the end of a line.
-     */
-    AtEndOfLine: boolean;
-
-    /**
-     * Indicates whether the stream pointer position is at the end of a stream.
-     */
-    AtEndOfStream: boolean;
-}
-
-declare var WScript: {
-    /**
-     * Outputs text to either a message box (under WScript.exe) or the command console window followed by
-     * a newline (under CScript.exe).
-     */
-    Echo(s: any): void;
-
-    /**
-     * Exposes the write-only error output stream for the current script.
-     * Can be accessed only while using CScript.exe.
-     */
-    StdErr: TextStreamWriter;
-
-    /**
-     * Exposes the write-only output stream for the current script.
-     * Can be accessed only while using CScript.exe.
-     */
-    StdOut: TextStreamWriter;
-    Arguments: { length: number; Item(n: number): string; };
-
-    /**
-     *  The full path of the currently running script.
-     */
-    ScriptFullName: string;
-
-    /**
-     * Forces the script to stop immediately, with an optional exit code.
-     */
-    Quit(exitCode?: number): number;
-
-    /**
-     * The Windows Script Host build version number.
-     */
-    BuildVersion: number;
-
-    /**
-     * Fully qualified path of the host executable.
-     */
-    FullName: string;
-
-    /**
-     * Gets/sets the script mode - interactive(true) or batch(false).
-     */
-    Interactive: boolean;
-
-    /**
-     * The name of the host executable (WScript.exe or CScript.exe).
-     */
-    Name: string;
-
-    /**
-     * Path of the directory containing the host executable.
-     */
-    Path: string;
-
-    /**
-     * The filename of the currently running script.
-     */
-    ScriptName: string;
-
-    /**
-     * Exposes the read-only input stream for the current script.
-     * Can be accessed only while using CScript.exe.
-     */
-    StdIn: TextStreamReader;
-
-    /**
-     * Windows Script Host version
-     */
-    Version: string;
-
-    /**
-     * Connects a COM object's event sources to functions named with a given prefix, in the form prefix_event.
-     */
-    ConnectObject(objEventSource: any, strPrefix: string): void;
-
-    /**
-     * Creates a COM object.
-     * @param strProgiID
-     * @param strPrefix Function names in the form prefix_event will be bound to this object's COM events.
-     */
-    CreateObject(strProgID: string, strPrefix?: string): any;
-
-    /**
-     * Disconnects a COM object from its event sources.
-     */
-    DisconnectObject(obj: any): void;
-
-    /**
-     * Retrieves an existing object with the specified ProgID from memory, or creates a new one from a file.
-     * @param strPathname Fully qualified path to the file containing the object persisted to disk.
-     *                       For objects in memory, pass a zero-length string.
-     * @param strProgID
-     * @param strPrefix Function names in the form prefix_event will be bound to this object's COM events.
-     */
-    GetObject(strPathname: string, strProgID?: string, strPrefix?: string): any;
-
-    /**
-     * Suspends script execution for a specified length of time, then continues execution.
-     * @param intTime Interval (in milliseconds) to suspend script execution.
-     */
-    Sleep(intTime: number): void;
-};
-
-/**
- * WSH is an alias for WScript under Windows Script Host
- */
-declare var WSH: typeof WScript;
-
-/**
- * Represents an Automation SAFEARRAY
- */
-declare class SafeArray<T = any> {
-    private constructor();
-    private SafeArray_typekey: SafeArray<T>;
-}
-
-/**
- * Allows enumerating over a COM collection, which may not have indexed item access.
- */
-interface Enumerator<T = any> {
-    /**
-     * Returns true if the current item is the last one in the collection, or the collection is empty,
-     * or the current item is undefined.
-     */
-    atEnd(): boolean;
-
-    /**
-     * Returns the current item in the collection
-     */
-    item(): T;
-
-    /**
-     * Resets the current item in the collection to the first item. If there are no items in the collection,
-     * the current item is set to undefined.
-     */
-    moveFirst(): void;
-
-    /**
-     * Moves the current item to the next item in the collection. If the enumerator is at the end of
-     * the collection or the collection is empty, the current item is set to undefined.
-     */
-    moveNext(): void;
-}
-
-interface EnumeratorConstructor {
-    new <T = any>(safearray: SafeArray<T>): Enumerator<T>;
-    new <T = any>(collection: { Item(index: any): T }): Enumerator<T>;
-    new <T = any>(collection: any): Enumerator<T>;
-}
-
-declare var Enumerator: EnumeratorConstructor;
-
-/**
- * Enables reading from a COM safe array, which might have an alternate lower bound, or multiple dimensions.
- */
-interface VBArray<T = any> {
-    /**
-     * Returns the number of dimensions (1-based).
-     */
-    dimensions(): number;
-
-    /**
-     * Takes an index for each dimension in the array, and returns the item at the corresponding location.
-     */
-    getItem(dimension1Index: number, ...dimensionNIndexes: number[]): T;
-
-    /**
-     * Returns the smallest available index for a given dimension.
-     * @param dimension 1-based dimension (defaults to 1)
-     */
-    lbound(dimension?: number): number;
-
-    /**
-     * Returns the largest available index for a given dimension.
-     * @param dimension 1-based dimension (defaults to 1)
-     */
-    ubound(dimension?: number): number;
-
-    /**
-     * Returns a Javascript array with all the elements in the VBArray. If there are multiple dimensions,
-     * each successive dimension is appended to the end of the array.
-     * Example: [[1,2,3],[4,5,6]] becomes [1,2,3,4,5,6]
-     */
-    toArray(): T[];
-}
-
-interface VBArrayConstructor {
-    new <T = any>(safeArray: SafeArray<T>): VBArray<T>;
-}
-
-declare var VBArray: VBArrayConstructor;
-
-/**
- * Automation date (VT_DATE)
- */
-declare class VarDate {
-    private constructor();
-    private VarDate_typekey: VarDate;
-}
-
-interface DateConstructor {
-    new (vd: VarDate): Date;
-}
-
-interface Date {
-    getVarDate: () => VarDate;
-}
-
-
-/// <reference path="lib.dom.d.ts" />
-
-interface DOMTokenList {
-    [Symbol.iterator](): IterableIterator<string>;
-}
-
-interface Headers {
-    [Symbol.iterator](): IterableIterator<[string, string]>;
-    /**
-     * Returns an iterator allowing to go through all key/value pairs contained in this object.
-     */
-    entries(): IterableIterator<[string, string]>;
-    /**
-     * Returns an iterator allowing to go through all keys f the key/value pairs contained in this object.
-     */
-    keys(): IterableIterator<string>;
-    /**
-     * Returns an iterator allowing to go through all values of the key/value pairs contained in this object.
-     */
-    values(): IterableIterator<string>;
-}
-
-interface NodeList {
-    /**
-     * Returns an array of key, value pairs for every entry in the list
-     */
-    entries(): IterableIterator<[number, Node]>;
-    /**
-     * Performs the specified action for each node in an list.
-     * @param callbackfn  A function that accepts up to three arguments. forEach calls the callbackfn function one time for each element in the list.
-     * @param thisArg  An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
-     */
-    forEach(callbackfn: (value: Node, index: number, listObj: NodeList) => void, thisArg?: any): void;
-    /**
-     * Returns an list of keys in the list
-     */
-    keys(): IterableIterator<number>;
-
-    /**
-     * Returns an list of values in the list
-     */
-    values(): IterableIterator<Node>;
-
-
-    [Symbol.iterator](): IterableIterator<Node>;
-}
-
-interface NodeListOf<TNode extends Node> {
-
-    /**
-     * Returns an array of key, value pairs for every entry in the list
-     */
-    entries(): IterableIterator<[number, TNode]>;
-
-    /**
-     * Performs the specified action for each node in an list.
-     * @param callbackfn  A function that accepts up to three arguments. forEach calls the callbackfn function one time for each element in the list.
-     * @param thisArg  An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
-     */
-    forEach(callbackfn: (value: TNode, index: number, listObj: NodeListOf<TNode>) => void, thisArg?: any): void;
-    /**
-     * Returns an list of keys in the list
-     */
-    keys(): IterableIterator<number>;
-    /**
-     * Returns an list of values in the list
-     */
-    values(): IterableIterator<TNode>;
-
-    [Symbol.iterator](): IterableIterator<TNode>;
-}
-
-interface HTMLCollectionBase {
-    [Symbol.iterator](): IterableIterator<Element>;
-}
-
-interface HTMLCollectionOf<T extends Element> {
-    [Symbol.iterator](): IterableIterator<T>;
-}
-
-interface FormData {
-    /**
-     * Returns an array of key, value pairs for every entry in the list
-     */
-    entries(): IterableIterator<[string, string | File]>;
-    /**
-     * Returns a list of keys in the list
-     */
-    keys(): IterableIterator<string>;
-    /**
-     * Returns a list of values in the list
-     */
-    values(): IterableIterator<string | File>;
-
-    [Symbol.iterator](): IterableIterator<string | File>;
-}
-
-interface URLSearchParams {
-    /**
-     * Returns an array of key, value pairs for every entry in the search params
-     */
-    entries(): IterableIterator<[string, string]>;
-    /**
-     * Returns a list of keys in the search params
-     */
-    keys(): IterableIterator<string>;
-    /**
-     * Returns a list of values in the search params
-     */
-    values(): IterableIterator<string>;
-    /**
-     * iterate over key/value pairs
-     */
-    [Symbol.iterator](): IterableIterator<[string, string]>;
-}
+/// <reference lib="es2016" />
+/// <reference lib="dom" />
+/// <reference lib="webworker.importscripts" />
+/// <reference lib="scripthost" />
+/// <reference lib="dom.iterable" />
\ No newline at end of file
diff --git a/lib/lib.es2017.d.ts b/lib/lib.es2017.d.ts
index 0598171a091..850e81d0f35 100644
--- a/lib/lib.es2017.d.ts
+++ b/lib/lib.es2017.d.ts
@@ -18,9 +18,9 @@ and limitations under the License.
 /// <reference no-default-lib="true"/>
 
 
-/// <reference path="lib.es2016.d.ts" />
-/// <reference path="lib.es2017.object.d.ts" />
-/// <reference path="lib.es2017.sharedmemory.d.ts" />
-/// <reference path="lib.es2017.string.d.ts" />
-/// <reference path="lib.es2017.intl.d.ts" />
-/// <reference path="lib.es2017.typedarrays.d.ts" />
+/// <reference lib="es2016" />
+/// <reference lib="es2017.object" />
+/// <reference lib="es2017.sharedmemory" />
+/// <reference lib="es2017.string" />
+/// <reference lib="es2017.intl" />
+/// <reference lib="es2017.typedarrays" />
diff --git a/lib/lib.es2017.full.d.ts b/lib/lib.es2017.full.d.ts
index 5266bd3358f..46d2ee836fa 100644
--- a/lib/lib.es2017.full.d.ts
+++ b/lib/lib.es2017.full.d.ts
@@ -18,16513 +18,8 @@ and limitations under the License.
 /// <reference no-default-lib="true"/>
 
 
-/// <reference path="lib.es2016.d.ts" />
-/// <reference path="lib.es2017.object.d.ts" />
-/// <reference path="lib.es2017.sharedmemory.d.ts" />
-/// <reference path="lib.es2017.string.d.ts" />
-/// <reference path="lib.es2017.intl.d.ts" />
-/// <reference path="lib.es2017.typedarrays.d.ts" />
-
-
-/////////////////////////////
-/// DOM APIs
-/////////////////////////////
-
-interface Account {
-    displayName: string;
-    id: string;
-    imageURL?: string;
-    name?: string;
-    rpDisplayName: string;
-}
-
-interface AddEventListenerOptions extends EventListenerOptions {
-    once?: boolean;
-    passive?: boolean;
-}
-
-interface AesCbcParams extends Algorithm {
-    iv: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-}
-
-interface AesCtrParams extends Algorithm {
-    counter: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-    length: number;
-}
-
-interface AesDerivedKeyParams extends Algorithm {
-    length: number;
-}
-
-interface AesGcmParams extends Algorithm {
-    additionalData?: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-    iv: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-    tagLength?: number;
-}
-
-interface AesKeyAlgorithm extends KeyAlgorithm {
-    length: number;
-}
-
-interface AesKeyGenParams extends Algorithm {
-    length: number;
-}
-
-interface Algorithm {
-    name: string;
-}
-
-interface AnalyserOptions extends AudioNodeOptions {
-    fftSize?: number;
-    maxDecibels?: number;
-    minDecibels?: number;
-    smoothingTimeConstant?: number;
-}
-
-interface AnimationEventInit extends EventInit {
-    animationName?: string;
-    elapsedTime?: number;
-}
-
-interface AssertionOptions {
-    allowList?: ScopedCredentialDescriptor[];
-    extensions?: WebAuthnExtensions;
-    rpId?: string;
-    timeoutSeconds?: number;
-}
-
-interface AudioBufferOptions {
-    length: number;
-    numberOfChannels?: number;
-    sampleRate: number;
-}
-
-interface AudioBufferSourceOptions {
-    buffer?: AudioBuffer | null;
-    detune?: number;
-    loop?: boolean;
-    loopEnd?: number;
-    loopStart?: number;
-    playbackRate?: number;
-}
-
-interface AudioContextInfo {
-    currentTime?: number;
-    sampleRate?: number;
-}
-
-interface AudioContextOptions {
-    latencyHint?: AudioContextLatencyCategory | number;
-    sampleRate?: number;
-}
-
-interface AudioNodeOptions {
-    channelCount?: number;
-    channelCountMode?: ChannelCountMode;
-    channelInterpretation?: ChannelInterpretation;
-}
-
-interface AudioParamDescriptor {
-    defaultValue?: number;
-    maxValue?: number;
-    minValue?: number;
-    name?: string;
-}
-
-interface AudioProcessingEventInit extends EventInit {
-    inputBuffer: AudioBuffer;
-    outputBuffer: AudioBuffer;
-    playbackTime: number;
-}
-
-interface AudioTimestamp {
-    contextTime?: number;
-    performanceTime?: number;
-}
-
-interface BiquadFilterOptions extends AudioNodeOptions {
-    Q?: number;
-    detune?: number;
-    frequency?: number;
-    gain?: number;
-    type?: BiquadFilterType;
-}
-
-interface ByteLengthChunk {
-    byteLength?: number;
-}
-
-interface CacheQueryOptions {
-    cacheName?: string;
-    ignoreMethod?: boolean;
-    ignoreSearch?: boolean;
-    ignoreVary?: boolean;
-}
-
-interface ChannelMergerOptions extends AudioNodeOptions {
-    numberOfInputs?: number;
-}
-
-interface ChannelSplitterOptions extends AudioNodeOptions {
-    numberOfOutputs?: number;
-}
-
-interface ClientData {
-    challenge: string;
-    extensions?: WebAuthnExtensions;
-    hashAlg: string | Algorithm;
-    origin: string;
-    rpId: string;
-    tokenBinding?: string;
-}
-
-interface ClientQueryOptions {
-    includeReserved?: boolean;
-    includeUncontrolled?: boolean;
-    type?: ClientTypes;
-}
-
-interface CloseEventInit extends EventInit {
-    code?: number;
-    reason?: string;
-    wasClean?: boolean;
-}
-
-interface CompositionEventInit extends UIEventInit {
-    data?: string;
-}
-
-interface ConfirmSiteSpecificExceptionsInformation extends ExceptionInformation {
-    arrayOfDomainStrings?: string[];
-}
-
-interface ConstantSourceOptions {
-    offset?: number;
-}
-
-interface ConstrainBooleanParameters {
-    exact?: boolean;
-    ideal?: boolean;
-}
-
-interface ConstrainDOMStringParameters {
-    exact?: string | string[];
-    ideal?: string | string[];
-}
-
-interface ConstrainDoubleRange extends DoubleRange {
-    exact?: number;
-    ideal?: number;
-}
-
-interface ConstrainLongRange extends LongRange {
-    exact?: number;
-    ideal?: number;
-}
-
-interface ConstrainVideoFacingModeParameters {
-    exact?: VideoFacingModeEnum | VideoFacingModeEnum[];
-    ideal?: VideoFacingModeEnum | VideoFacingModeEnum[];
-}
-
-interface ConvolverOptions extends AudioNodeOptions {
-    buffer?: AudioBuffer | null;
-    disableNormalization?: boolean;
-}
-
-interface CustomEventInit<T = any> extends EventInit {
-    detail?: T;
-}
-
-interface DOMRectInit {
-    height?: number;
-    width?: number;
-    x?: number;
-    y?: number;
-}
-
-interface DelayOptions extends AudioNodeOptions {
-    delayTime?: number;
-    maxDelayTime?: number;
-}
-
-interface DeviceAccelerationDict {
-    x?: number | null;
-    y?: number | null;
-    z?: number | null;
-}
-
-interface DeviceLightEventInit extends EventInit {
-    value?: number;
-}
-
-interface DeviceMotionEventInit extends EventInit {
-    acceleration?: DeviceAccelerationDict | null;
-    accelerationIncludingGravity?: DeviceAccelerationDict | null;
-    interval?: number | null;
-    rotationRate?: DeviceRotationRateDict | null;
-}
-
-interface DeviceOrientationEventInit extends EventInit {
-    absolute?: boolean;
-    alpha?: number | null;
-    beta?: number | null;
-    gamma?: number | null;
-}
-
-interface DeviceRotationRateDict {
-    alpha?: number | null;
-    beta?: number | null;
-    gamma?: number | null;
-}
-
-interface DoubleRange {
-    max?: number;
-    min?: number;
-}
-
-interface DynamicsCompressorOptions extends AudioNodeOptions {
-    attack?: number;
-    knee?: number;
-    ratio?: number;
-    release?: number;
-    threshold?: number;
-}
-
-interface EcKeyAlgorithm extends KeyAlgorithm {
-    namedCurve: string;
-}
-
-interface EcKeyGenParams extends Algorithm {
-    namedCurve: string;
-}
-
-interface EcKeyImportParams extends Algorithm {
-    namedCurve: string;
-}
-
-interface EcdhKeyDeriveParams extends Algorithm {
-    public: CryptoKey;
-}
-
-interface EcdsaParams extends Algorithm {
-    hash: string | Algorithm;
-}
-
-interface ErrorEventInit extends EventInit {
-    colno?: number;
-    error?: any;
-    filename?: string;
-    lineno?: number;
-    message?: string;
-}
-
-interface EventInit {
-    bubbles?: boolean;
-    cancelable?: boolean;
-    scoped?: boolean;
-}
-
-interface EventListenerOptions {
-    capture?: boolean;
-}
-
-interface EventModifierInit extends UIEventInit {
-    altKey?: boolean;
-    ctrlKey?: boolean;
-    metaKey?: boolean;
-    modifierAltGraph?: boolean;
-    modifierCapsLock?: boolean;
-    modifierFn?: boolean;
-    modifierFnLock?: boolean;
-    modifierHyper?: boolean;
-    modifierNumLock?: boolean;
-    modifierOS?: boolean;
-    modifierScrollLock?: boolean;
-    modifierSuper?: boolean;
-    modifierSymbol?: boolean;
-    modifierSymbolLock?: boolean;
-    shiftKey?: boolean;
-}
-
-interface ExceptionInformation {
-    domain?: string | null;
-}
-
-interface ExtendableEventInit extends EventInit {
-}
-
-interface ExtendableMessageEventInit extends ExtendableEventInit {
-    data?: any;
-    lastEventId?: string;
-    origin?: string;
-    ports?: MessagePort[] | null;
-    source?: object | ServiceWorker | MessagePort | null;
-}
-
-interface FetchEventInit extends ExtendableEventInit {
-    clientId?: string;
-    request: Request;
-    reservedClientId?: string;
-    targetClientId?: string;
-}
-
-interface FocusEventInit extends UIEventInit {
-    relatedTarget?: EventTarget | null;
-}
-
-interface FocusNavigationEventInit extends EventInit {
-    navigationReason?: string | null;
-    originHeight?: number;
-    originLeft?: number;
-    originTop?: number;
-    originWidth?: number;
-}
-
-interface FocusNavigationOrigin {
-    originHeight?: number;
-    originLeft?: number;
-    originTop?: number;
-    originWidth?: number;
-}
-
-interface GainOptions extends AudioNodeOptions {
-    gain?: number;
-}
-
-interface GamepadEventInit extends EventInit {
-    gamepad?: Gamepad;
-}
-
-interface GetNotificationOptions {
-    tag?: string;
-}
-
-interface HashChangeEventInit extends EventInit {
-    newURL?: string;
-    oldURL?: string;
-}
-
-interface HkdfParams extends Algorithm {
-    hash: string | Algorithm;
-    info: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-    salt: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-}
-
-interface HmacImportParams extends Algorithm {
-    hash: string | Algorithm;
-    length?: number;
-}
-
-interface HmacKeyAlgorithm extends KeyAlgorithm {
-    hash: KeyAlgorithm;
-    length: number;
-}
-
-interface HmacKeyGenParams extends Algorithm {
-    hash: string | Algorithm;
-    length?: number;
-}
-
-interface IDBIndexParameters {
-    multiEntry?: boolean;
-    unique?: boolean;
-}
-
-interface IDBObjectStoreParameters {
-    autoIncrement?: boolean;
-    keyPath?: string | string[];
-}
-
-interface IIRFilterOptions extends AudioNodeOptions {
-    feedback: number[];
-    feedforward: number[];
-}
-
-interface IntersectionObserverEntryInit {
-    boundingClientRect: DOMRectInit;
-    intersectionRect: DOMRectInit;
-    isIntersecting: boolean;
-    rootBounds: DOMRectInit;
-    target: Element;
-    time: number;
-}
-
-interface IntersectionObserverInit {
-    root?: Element | null;
-    rootMargin?: string;
-    threshold?: number | number[];
-}
-
-interface JsonWebKey {
-    alg?: string;
-    crv?: string;
-    d?: string;
-    dp?: string;
-    dq?: string;
-    e?: string;
-    ext?: boolean;
-    k?: string;
-    key_ops?: string[];
-    kty?: string;
-    n?: string;
-    oth?: RsaOtherPrimesInfo[];
-    p?: string;
-    q?: string;
-    qi?: string;
-    use?: string;
-    x?: string;
-    y?: string;
-}
-
-interface KeyAlgorithm {
-    name: string;
-}
-
-interface KeyboardEventInit extends EventModifierInit {
-    code?: string;
-    key?: string;
-    location?: number;
-    repeat?: boolean;
-}
-
-interface LongRange {
-    max?: number;
-    min?: number;
-}
-
-interface MSAccountInfo {
-    accountImageUri?: string;
-    accountName?: string;
-    rpDisplayName: string;
-    userDisplayName: string;
-    userId?: string;
-}
-
-interface MSAudioLocalClientEvent extends MSLocalClientEventBase {
-    cpuInsufficientEventRatio?: number;
-    deviceCaptureNotFunctioningEventRatio?: number;
-    deviceClippingEventRatio?: number;
-    deviceEchoEventRatio?: number;
-    deviceGlitchesEventRatio?: number;
-    deviceHalfDuplexAECEventRatio?: number;
-    deviceHowlingEventCount?: number;
-    deviceLowSNREventRatio?: number;
-    deviceLowSpeechLevelEventRatio?: number;
-    deviceMultipleEndpointsEventCount?: number;
-    deviceNearEndToEchoRatioEventRatio?: number;
-    deviceRenderMuteEventRatio?: number;
-    deviceRenderNotFunctioningEventRatio?: number;
-    deviceRenderZeroVolumeEventRatio?: number;
-    networkDelayEventRatio?: number;
-    networkSendQualityEventRatio?: number;
-}
-
-interface MSAudioRecvPayload extends MSPayloadBase {
-    burstLossLength1?: number;
-    burstLossLength2?: number;
-    burstLossLength3?: number;
-    burstLossLength4?: number;
-    burstLossLength5?: number;
-    burstLossLength6?: number;
-    burstLossLength7?: number;
-    burstLossLength8OrHigher?: number;
-    fecRecvDistance1?: number;
-    fecRecvDistance2?: number;
-    fecRecvDistance3?: number;
-    packetReorderDepthAvg?: number;
-    packetReorderDepthMax?: number;
-    packetReorderRatio?: number;
-    ratioCompressedSamplesAvg?: number;
-    ratioConcealedSamplesAvg?: number;
-    ratioStretchedSamplesAvg?: number;
-    samplingRate?: number;
-    signal?: MSAudioRecvSignal;
-}
-
-interface MSAudioRecvSignal {
-    initialSignalLevelRMS?: number;
-    recvNoiseLevelCh1?: number;
-    recvSignalLevelCh1?: number;
-    renderLoopbackSignalLevel?: number;
-    renderNoiseLevel?: number;
-    renderSignalLevel?: number;
-}
-
-interface MSAudioSendPayload extends MSPayloadBase {
-    audioFECUsed?: boolean;
-    samplingRate?: number;
-    sendMutePercent?: number;
-    signal?: MSAudioSendSignal;
-}
-
-interface MSAudioSendSignal {
-    noiseLevel?: number;
-    sendNoiseLevelCh1?: number;
-    sendSignalLevelCh1?: number;
-}
-
-interface MSConnectivity {
-    iceType?: MSIceType;
-    iceWarningFlags?: MSIceWarningFlags;
-    relayAddress?: MSRelayAddress;
-}
-
-interface MSCredentialFilter {
-    accept?: MSCredentialSpec[];
-}
-
-interface MSCredentialParameters {
-    type?: MSCredentialType;
-}
-
-interface MSCredentialSpec {
-    id?: string;
-    type: MSCredentialType;
-}
-
-interface MSDCCEventInit extends EventInit {
-    maxFr?: number;
-    maxFs?: number;
-}
-
-interface MSDSHEventInit extends EventInit {
-    sources?: number[];
-    timestamp?: number;
-}
-
-interface MSDelay {
-    roundTrip?: number;
-    roundTripMax?: number;
-}
-
-interface MSDescription extends RTCStats {
-    connectivity?: MSConnectivity;
-    deviceDevName?: string;
-    localAddr?: MSIPAddressInfo;
-    networkconnectivity?: MSNetworkConnectivityInfo;
-    reflexiveLocalIPAddr?: MSIPAddressInfo;
-    remoteAddr?: MSIPAddressInfo;
-    transport?: RTCIceProtocol;
-}
-
-interface MSFIDOCredentialParameters extends MSCredentialParameters {
-    algorithm?: string | Algorithm;
-    authenticators?: string[];
-}
-
-interface MSIPAddressInfo {
-    ipAddr?: string;
-    manufacturerMacAddrMask?: string;
-    port?: number;
-}
-
-interface MSIceWarningFlags {
-    allocationMessageIntegrityFailed?: boolean;
-    alternateServerReceived?: boolean;
-    connCheckMessageIntegrityFailed?: boolean;
-    connCheckOtherError?: boolean;
-    fipsAllocationFailure?: boolean;
-    multipleRelayServersAttempted?: boolean;
-    noRelayServersConfigured?: boolean;
-    portRangeExhausted?: boolean;
-    pseudoTLSFailure?: boolean;
-    tcpNatConnectivityFailed?: boolean;
-    tcpRelayConnectivityFailed?: boolean;
-    turnAuthUnknownUsernameError?: boolean;
-    turnTcpAllocateFailed?: boolean;
-    turnTcpSendFailed?: boolean;
-    turnTcpTimedOut?: boolean;
-    turnTurnTcpConnectivityFailed?: boolean;
-    turnUdpAllocateFailed?: boolean;
-    turnUdpSendFailed?: boolean;
-    udpLocalConnectivityFailed?: boolean;
-    udpNatConnectivityFailed?: boolean;
-    udpRelayConnectivityFailed?: boolean;
-    useCandidateChecksFailed?: boolean;
-}
-
-interface MSJitter {
-    interArrival?: number;
-    interArrivalMax?: number;
-    interArrivalSD?: number;
-}
-
-interface MSLocalClientEventBase extends RTCStats {
-    networkBandwidthLowEventRatio?: number;
-    networkReceiveQualityEventRatio?: number;
-}
-
-interface MSNetwork extends RTCStats {
-    delay?: MSDelay;
-    jitter?: MSJitter;
-    packetLoss?: MSPacketLoss;
-    utilization?: MSUtilization;
-}
-
-interface MSNetworkConnectivityInfo {
-    linkspeed?: number;
-    networkConnectionDetails?: string;
-    vpn?: boolean;
-}
-
-interface MSNetworkInterfaceType {
-    interfaceTypeEthernet?: boolean;
-    interfaceTypePPP?: boolean;
-    interfaceTypeTunnel?: boolean;
-    interfaceTypeWWAN?: boolean;
-    interfaceTypeWireless?: boolean;
-}
-
-interface MSOutboundNetwork extends MSNetwork {
-    appliedBandwidthLimit?: number;
-}
-
-interface MSPacketLoss {
-    lossRate?: number;
-    lossRateMax?: number;
-}
-
-interface MSPayloadBase extends RTCStats {
-    payloadDescription?: string;
-}
-
-interface MSPortRange {
-    max?: number;
-    min?: number;
-}
-
-interface MSRelayAddress {
-    port?: number;
-    relayAddress?: string;
-}
-
-interface MSSignatureParameters {
-    userPrompt?: string;
-}
-
-interface MSTransportDiagnosticsStats extends RTCStats {
-    allocationTimeInMs?: number;
-    baseAddress?: string;
-    baseInterface?: MSNetworkInterfaceType;
-    iceRole?: RTCIceRole;
-    iceWarningFlags?: MSIceWarningFlags;
-    interfaces?: MSNetworkInterfaceType;
-    localAddrType?: MSIceAddrType;
-    localAddress?: string;
-    localInterface?: MSNetworkInterfaceType;
-    localMR?: string;
-    localMRTCPPort?: number;
-    localSite?: string;
-    msRtcEngineVersion?: string;
-    networkName?: string;
-    numConsentReqReceived?: number;
-    numConsentReqSent?: number;
-    numConsentRespReceived?: number;
-    numConsentRespSent?: number;
-    portRangeMax?: number;
-    portRangeMin?: number;
-    protocol?: RTCIceProtocol;
-    remoteAddrType?: MSIceAddrType;
-    remoteAddress?: string;
-    remoteMR?: string;
-    remoteMRTCPPort?: number;
-    remoteSite?: string;
-    rtpRtcpMux?: boolean;
-    stunVer?: number;
-}
-
-interface MSUtilization {
-    bandwidthEstimation?: number;
-    bandwidthEstimationAvg?: number;
-    bandwidthEstimationMax?: number;
-    bandwidthEstimationMin?: number;
-    bandwidthEstimationStdDev?: number;
-    packets?: number;
-}
-
-interface MSVideoPayload extends MSPayloadBase {
-    durationSeconds?: number;
-    resolution?: string;
-    videoBitRateAvg?: number;
-    videoBitRateMax?: number;
-    videoFrameRateAvg?: number;
-    videoPacketLossRate?: number;
-}
-
-interface MSVideoRecvPayload extends MSVideoPayload {
-    lowBitRateCallPercent?: number;
-    lowFrameRateCallPercent?: number;
-    recvBitRateAverage?: number;
-    recvBitRateMaximum?: number;
-    recvCodecType?: string;
-    recvFpsHarmonicAverage?: number;
-    recvFrameRateAverage?: number;
-    recvNumResSwitches?: number;
-    recvReorderBufferMaxSuccessfullyOrderedExtent?: number;
-    recvReorderBufferMaxSuccessfullyOrderedLateTime?: number;
-    recvReorderBufferPacketsDroppedDueToBufferExhaustion?: number;
-    recvReorderBufferPacketsDroppedDueToTimeout?: number;
-    recvReorderBufferReorderedPackets?: number;
-    recvResolutionHeight?: number;
-    recvResolutionWidth?: number;
-    recvVideoStreamsMax?: number;
-    recvVideoStreamsMin?: number;
-    recvVideoStreamsMode?: number;
-    reorderBufferTotalPackets?: number;
-    videoFrameLossRate?: number;
-    videoPostFECPLR?: number;
-    videoResolutions?: MSVideoResolutionDistribution;
-}
-
-interface MSVideoResolutionDistribution {
-    cifQuality?: number;
-    h1080Quality?: number;
-    h1440Quality?: number;
-    h2160Quality?: number;
-    h720Quality?: number;
-    vgaQuality?: number;
-}
-
-interface MSVideoSendPayload extends MSVideoPayload {
-    sendBitRateAverage?: number;
-    sendBitRateMaximum?: number;
-    sendFrameRateAverage?: number;
-    sendResolutionHeight?: number;
-    sendResolutionWidth?: number;
-    sendVideoStreamsMax?: number;
-}
-
-interface MediaElementAudioSourceOptions {
-    mediaElement: HTMLMediaElement;
-}
-
-interface MediaEncryptedEventInit extends EventInit {
-    initData?: ArrayBuffer | null;
-    initDataType?: string;
-}
-
-interface MediaKeyMessageEventInit extends EventInit {
-    message?: ArrayBuffer | null;
-    messageType?: MediaKeyMessageType;
-}
-
-interface MediaKeySystemConfiguration {
-    audioCapabilities?: MediaKeySystemMediaCapability[];
-    distinctiveIdentifier?: MediaKeysRequirement;
-    initDataTypes?: string[];
-    persistentState?: MediaKeysRequirement;
-    videoCapabilities?: MediaKeySystemMediaCapability[];
-}
-
-interface MediaKeySystemMediaCapability {
-    contentType?: string;
-    robustness?: string;
-}
-
-interface MediaStreamConstraints {
-    audio?: boolean | MediaTrackConstraints;
-    video?: boolean | MediaTrackConstraints;
-}
-
-interface MediaStreamErrorEventInit extends EventInit {
-    error?: MediaStreamError | null;
-}
-
-interface MediaStreamEventInit extends EventInit {
-    stream?: MediaStream;
-}
-
-interface MediaStreamTrackEventInit extends EventInit {
-    track?: MediaStreamTrack | null;
-}
-
-interface MediaTrackCapabilities {
-    aspectRatio?: number | DoubleRange;
-    deviceId?: string;
-    echoCancellation?: boolean[];
-    facingMode?: string;
-    frameRate?: number | DoubleRange;
-    groupId?: string;
-    height?: number | LongRange;
-    sampleRate?: number | LongRange;
-    sampleSize?: number | LongRange;
-    volume?: number | DoubleRange;
-    width?: number | LongRange;
-}
-
-interface MediaTrackConstraintSet {
-    aspectRatio?: number | ConstrainDoubleRange;
-    channelCount?: number | ConstrainLongRange;
-    deviceId?: string | string[] | ConstrainDOMStringParameters;
-    displaySurface?: string | string[] | ConstrainDOMStringParameters;
-    echoCancellation?: boolean | ConstrainBooleanParameters;
-    facingMode?: string | string[] | ConstrainDOMStringParameters;
-    frameRate?: number | ConstrainDoubleRange;
-    groupId?: string | string[] | ConstrainDOMStringParameters;
-    height?: number | ConstrainLongRange;
-    latency?: number | ConstrainDoubleRange;
-    logicalSurface?: boolean | ConstrainBooleanParameters;
-    sampleRate?: number | ConstrainLongRange;
-    sampleSize?: number | ConstrainLongRange;
-    volume?: number | ConstrainDoubleRange;
-    width?: number | ConstrainLongRange;
-}
-
-interface MediaTrackConstraints extends MediaTrackConstraintSet {
-    advanced?: MediaTrackConstraintSet[];
-}
-
-interface MediaTrackSettings {
-    aspectRatio?: number;
-    deviceId?: string;
-    echoCancellation?: boolean;
-    facingMode?: string;
-    frameRate?: number;
-    groupId?: string;
-    height?: number;
-    sampleRate?: number;
-    sampleSize?: number;
-    volume?: number;
-    width?: number;
-}
-
-interface MediaTrackSupportedConstraints {
-    aspectRatio?: boolean;
-    deviceId?: boolean;
-    echoCancellation?: boolean;
-    facingMode?: boolean;
-    frameRate?: boolean;
-    groupId?: boolean;
-    height?: boolean;
-    sampleRate?: boolean;
-    sampleSize?: boolean;
-    volume?: boolean;
-    width?: boolean;
-}
-
-interface MessageEventInit extends EventInit {
-    channel?: string;
-    data?: any;
-    lastEventId?: string;
-    origin?: string;
-    ports?: MessagePort[];
-    source?: Window | null;
-}
-
-interface MouseEventInit extends EventModifierInit {
-    button?: number;
-    buttons?: number;
-    clientX?: number;
-    clientY?: number;
-    relatedTarget?: EventTarget | null;
-    screenX?: number;
-    screenY?: number;
-}
-
-interface MsZoomToOptions {
-    animate?: string;
-    contentX?: number;
-    contentY?: number;
-    scaleFactor?: number;
-    viewportX?: string | null;
-    viewportY?: string | null;
-}
-
-interface MutationObserverInit {
-    attributeFilter?: string[];
-    attributeOldValue?: boolean;
-    attributes?: boolean;
-    characterData?: boolean;
-    characterDataOldValue?: boolean;
-    childList?: boolean;
-    subtree?: boolean;
-}
-
-interface NotificationEventInit extends ExtendableEventInit {
-    action?: string;
-    notification: Notification;
-}
-
-interface NotificationOptions {
-    body?: string;
-    data?: any;
-    dir?: NotificationDirection;
-    icon?: string;
-    lang?: string;
-    tag?: string;
-}
-
-interface ObjectURLOptions {
-    oneTimeOnly?: boolean;
-}
-
-interface OfflineAudioCompletionEventInit extends EventInit {
-    renderedBuffer: AudioBuffer;
-}
-
-interface OscillatorOptions extends AudioNodeOptions {
-    detune?: number;
-    frequency?: number;
-    periodicWave?: PeriodicWave;
-    type?: OscillatorType;
-}
-
-interface PannerOptions extends AudioNodeOptions {
-    coneInnerAngle?: number;
-    coneOuterAngle?: number;
-    coneOuterGain?: number;
-    distanceModel?: DistanceModelType;
-    maxDistance?: number;
-    orientationX?: number;
-    orientationY?: number;
-    orientationZ?: number;
-    panningModel?: PanningModelType;
-    positionX?: number;
-    positionY?: number;
-    positionZ?: number;
-    refDistance?: number;
-    rolloffFactor?: number;
-}
-
-interface PaymentCurrencyAmount {
-    currency: string;
-    currencySystem?: string;
-    value: string;
-}
-
-interface PaymentDetailsBase {
-    displayItems?: PaymentItem[];
-    modifiers?: PaymentDetailsModifier[];
-    shippingOptions?: PaymentShippingOption[];
-}
-
-interface PaymentDetailsInit extends PaymentDetailsBase {
-    id?: string;
-    total: PaymentItem;
-}
-
-interface PaymentDetailsModifier {
-    additionalDisplayItems?: PaymentItem[];
-    data?: any;
-    supportedMethods: string | string[];
-    total?: PaymentItem;
-}
-
-interface PaymentDetailsUpdate extends PaymentDetailsBase {
-    error?: string;
-    total?: PaymentItem;
-}
-
-interface PaymentItem {
-    amount: PaymentCurrencyAmount;
-    label: string;
-    pending?: boolean;
-}
-
-interface PaymentMethodData {
-    data?: any;
-    supportedMethods: string | string[];
-}
-
-interface PaymentOptions {
-    requestPayerEmail?: boolean;
-    requestPayerName?: boolean;
-    requestPayerPhone?: boolean;
-    requestShipping?: boolean;
-    shippingType?: string;
-}
-
-interface PaymentRequestUpdateEventInit extends EventInit {
-}
-
-interface PaymentShippingOption {
-    amount: PaymentCurrencyAmount;
-    id: string;
-    label: string;
-    selected?: boolean;
-}
-
-interface Pbkdf2Params extends Algorithm {
-    hash: string | Algorithm;
-    iterations: number;
-    salt: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-}
-
-interface PeriodicWaveConstraints {
-    disableNormalization?: boolean;
-}
-
-interface PeriodicWaveOptions extends PeriodicWaveConstraints {
-    imag?: number[];
-    real?: number[];
-}
-
-interface PointerEventInit extends MouseEventInit {
-    height?: number;
-    isPrimary?: boolean;
-    pointerId?: number;
-    pointerType?: string;
-    pressure?: number;
-    tiltX?: number;
-    tiltY?: number;
-    width?: number;
-}
-
-interface PopStateEventInit extends EventInit {
-    state?: any;
-}
-
-interface PositionOptions {
-    enableHighAccuracy?: boolean;
-    maximumAge?: number;
-    timeout?: number;
-}
-
-interface ProgressEventInit extends EventInit {
-    lengthComputable?: boolean;
-    loaded?: number;
-    total?: number;
-}
-
-interface PushEventInit extends ExtendableEventInit {
-    data?: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | string | null;
-}
-
-interface PushSubscriptionChangeInit extends ExtendableEventInit {
-    newSubscription?: PushSubscription;
-    oldSubscription?: PushSubscription;
-}
-
-interface PushSubscriptionOptionsInit {
-    applicationServerKey?: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | string | null;
-    userVisibleOnly?: boolean;
-}
-
-interface QueuingStrategy {
-    highWaterMark?: number;
-    size?: WritableStreamChunkCallback;
-}
-
-interface RTCConfiguration {
-    bundlePolicy?: RTCBundlePolicy;
-    iceServers?: RTCIceServer[];
-    iceTransportPolicy?: RTCIceTransportPolicy;
-    peerIdentity?: string;
-}
-
-interface RTCDTMFToneChangeEventInit extends EventInit {
-    tone?: string;
-}
-
-interface RTCDtlsFingerprint {
-    algorithm?: string;
-    value?: string;
-}
-
-interface RTCDtlsParameters {
-    fingerprints?: RTCDtlsFingerprint[];
-    role?: RTCDtlsRole;
-}
-
-interface RTCIceCandidateAttributes extends RTCStats {
-    addressSourceUrl?: string;
-    candidateType?: RTCStatsIceCandidateType;
-    ipAddress?: string;
-    portNumber?: number;
-    priority?: number;
-    transport?: string;
-}
-
-interface RTCIceCandidateComplete {
-}
-
-interface RTCIceCandidateDictionary {
-    foundation?: string;
-    ip?: string;
-    msMTurnSessionId?: string;
-    port?: number;
-    priority?: number;
-    protocol?: RTCIceProtocol;
-    relatedAddress?: string;
-    relatedPort?: number;
-    tcpType?: RTCIceTcpCandidateType;
-    type?: RTCIceCandidateType;
-}
-
-interface RTCIceCandidateInit {
-    candidate?: string;
-    sdpMLineIndex?: number;
-    sdpMid?: string;
-}
-
-interface RTCIceCandidatePair {
-    local?: RTCIceCandidateDictionary;
-    remote?: RTCIceCandidateDictionary;
-}
-
-interface RTCIceCandidatePairStats extends RTCStats {
-    availableIncomingBitrate?: number;
-    availableOutgoingBitrate?: number;
-    bytesReceived?: number;
-    bytesSent?: number;
-    localCandidateId?: string;
-    nominated?: boolean;
-    priority?: number;
-    readable?: boolean;
-    remoteCandidateId?: string;
-    roundTripTime?: number;
-    state?: RTCStatsIceCandidatePairState;
-    transportId?: string;
-    writable?: boolean;
-}
-
-interface RTCIceGatherOptions {
-    gatherPolicy?: RTCIceGatherPolicy;
-    iceservers?: RTCIceServer[];
-    portRange?: MSPortRange;
-}
-
-interface RTCIceParameters {
-    iceLite?: boolean | null;
-    password?: string;
-    usernameFragment?: string;
-}
-
-interface RTCIceServer {
-    credential?: string | null;
-    urls?: any;
-    username?: string | null;
-}
-
-interface RTCInboundRTPStreamStats extends RTCRTPStreamStats {
-    bytesReceived?: number;
-    fractionLost?: number;
-    jitter?: number;
-    packetsLost?: number;
-    packetsReceived?: number;
-}
-
-interface RTCMediaStreamTrackStats extends RTCStats {
-    audioLevel?: number;
-    echoReturnLoss?: number;
-    echoReturnLossEnhancement?: number;
-    frameHeight?: number;
-    frameWidth?: number;
-    framesCorrupted?: number;
-    framesDecoded?: number;
-    framesDropped?: number;
-    framesPerSecond?: number;
-    framesReceived?: number;
-    framesSent?: number;
-    remoteSource?: boolean;
-    ssrcIds?: string[];
-    trackIdentifier?: string;
-}
-
-interface RTCOfferOptions {
-    iceRestart?: boolean;
-    offerToReceiveAudio?: number;
-    offerToReceiveVideo?: number;
-    voiceActivityDetection?: boolean;
-}
-
-interface RTCOutboundRTPStreamStats extends RTCRTPStreamStats {
-    bytesSent?: number;
-    packetsSent?: number;
-    roundTripTime?: number;
-    targetBitrate?: number;
-}
-
-interface RTCPeerConnectionIceEventInit extends EventInit {
-    candidate?: RTCIceCandidate;
-}
-
-interface RTCRTPStreamStats extends RTCStats {
-    associateStatsId?: string;
-    codecId?: string;
-    firCount?: number;
-    isRemote?: boolean;
-    mediaTrackId?: string;
-    mediaType?: string;
-    nackCount?: number;
-    pliCount?: number;
-    sliCount?: number;
-    ssrc?: string;
-    transportId?: string;
-}
-
-interface RTCRtcpFeedback {
-    parameter?: string;
-    type?: string;
-}
-
-interface RTCRtcpParameters {
-    cname?: string;
-    mux?: boolean;
-    reducedSize?: boolean;
-    ssrc?: number;
-}
-
-interface RTCRtpCapabilities {
-    codecs?: RTCRtpCodecCapability[];
-    fecMechanisms?: string[];
-    headerExtensions?: RTCRtpHeaderExtension[];
-}
-
-interface RTCRtpCodecCapability {
-    clockRate?: number;
-    kind?: string;
-    maxSpatialLayers?: number;
-    maxTemporalLayers?: number;
-    maxptime?: number;
-    name?: string;
-    numChannels?: number;
-    options?: any;
-    parameters?: any;
-    preferredPayloadType?: number;
-    ptime?: number;
-    rtcpFeedback?: RTCRtcpFeedback[];
-    svcMultiStreamSupport?: boolean;
-}
-
-interface RTCRtpCodecParameters {
-    clockRate?: number;
-    maxptime?: number;
-    name?: string;
-    numChannels?: number;
-    parameters?: any;
-    payloadType?: number;
-    ptime?: number;
-    rtcpFeedback?: RTCRtcpFeedback[];
-}
-
-interface RTCRtpContributingSource {
-    audioLevel?: number;
-    csrc?: number;
-    timestamp?: number;
-}
-
-interface RTCRtpEncodingParameters {
-    active?: boolean;
-    codecPayloadType?: number;
-    dependencyEncodingIds?: string[];
-    encodingId?: string;
-    fec?: RTCRtpFecParameters;
-    framerateScale?: number;
-    maxBitrate?: number;
-    maxFramerate?: number;
-    minQuality?: number;
-    priority?: number;
-    resolutionScale?: number;
-    rtx?: RTCRtpRtxParameters;
-    ssrc?: number;
-    ssrcRange?: RTCSsrcRange;
-}
-
-interface RTCRtpFecParameters {
-    mechanism?: string;
-    ssrc?: number;
-}
-
-interface RTCRtpHeaderExtension {
-    kind?: string;
-    preferredEncrypt?: boolean;
-    preferredId?: number;
-    uri?: string;
-}
-
-interface RTCRtpHeaderExtensionParameters {
-    encrypt?: boolean;
-    id?: number;
-    uri?: string;
-}
-
-interface RTCRtpParameters {
-    codecs?: RTCRtpCodecParameters[];
-    degradationPreference?: RTCDegradationPreference;
-    encodings?: RTCRtpEncodingParameters[];
-    headerExtensions?: RTCRtpHeaderExtensionParameters[];
-    muxId?: string;
-    rtcp?: RTCRtcpParameters;
-}
-
-interface RTCRtpRtxParameters {
-    ssrc?: number;
-}
-
-interface RTCRtpUnhandled {
-    muxId?: string;
-    payloadType?: number;
-    ssrc?: number;
-}
-
-interface RTCSessionDescriptionInit {
-    sdp?: string;
-    type?: RTCSdpType;
-}
-
-interface RTCSrtpKeyParam {
-    keyMethod?: string;
-    keySalt?: string;
-    lifetime?: string;
-    mkiLength?: number;
-    mkiValue?: number;
-}
-
-interface RTCSrtpSdesParameters {
-    cryptoSuite?: string;
-    keyParams?: RTCSrtpKeyParam[];
-    sessionParams?: string[];
-    tag?: number;
-}
-
-interface RTCSsrcRange {
-    max?: number;
-    min?: number;
-}
-
-interface RTCStats {
-    id?: string;
-    msType?: MSStatsType;
-    timestamp?: number;
-    type?: RTCStatsType;
-}
-
-interface RTCStatsReport {
-}
-
-interface RTCTransportStats extends RTCStats {
-    activeConnection?: boolean;
-    bytesReceived?: number;
-    bytesSent?: number;
-    localCertificateId?: string;
-    remoteCertificateId?: string;
-    rtcpTransportStatsId?: string;
-    selectedCandidatePairId?: string;
-}
-
-interface RegistrationOptions {
-    scope?: string;
-}
-
-interface RequestInit {
-    body?: Blob | Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | FormData | string | null;
-    cache?: RequestCache;
-    credentials?: RequestCredentials;
-    headers?: HeadersInit;
-    integrity?: string;
-    keepalive?: boolean;
-    method?: string;
-    mode?: RequestMode;
-    redirect?: RequestRedirect;
-    referrer?: string;
-    referrerPolicy?: ReferrerPolicy;
-    signal?: AbortSignal;
-    window?: any;
-}
-
-interface ResponseInit {
-    headers?: HeadersInit;
-    status?: number;
-    statusText?: string;
-}
-
-interface RsaHashedImportParams extends Algorithm {
-    hash: string | Algorithm;
-}
-
-interface RsaHashedKeyAlgorithm extends RsaKeyAlgorithm {
-    hash: KeyAlgorithm;
-}
-
-interface RsaHashedKeyGenParams extends RsaKeyGenParams {
-    hash: string | Algorithm;
-}
-
-interface RsaKeyAlgorithm extends KeyAlgorithm {
-    modulusLength: number;
-    publicExponent: Uint8Array;
-}
-
-interface RsaKeyGenParams extends Algorithm {
-    modulusLength: number;
-    publicExponent: Uint8Array;
-}
-
-interface RsaOaepParams extends Algorithm {
-    label?: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-}
-
-interface RsaOtherPrimesInfo {
-    d?: string;
-    r?: string;
-    t?: string;
-}
-
-interface RsaPssParams extends Algorithm {
-    saltLength: number;
-}
-
-interface ScopedCredentialDescriptor {
-    id: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-    transports?: Transport[];
-    type: ScopedCredentialType;
-}
-
-interface ScopedCredentialOptions {
-    excludeList?: ScopedCredentialDescriptor[];
-    extensions?: WebAuthnExtensions;
-    rpId?: string;
-    timeoutSeconds?: number;
-}
-
-interface ScopedCredentialParameters {
-    algorithm: string | Algorithm;
-    type: ScopedCredentialType;
-}
-
-interface SecurityPolicyViolationEventInit extends EventInit {
-    blockedURI?: string;
-    columnNumber?: number;
-    documentURI?: string;
-    effectiveDirective?: string;
-    lineNumber?: number;
-    originalPolicy?: string;
-    referrer?: string;
-    sourceFile?: string;
-    statusCode?: number;
-    violatedDirective?: string;
-}
-
-interface ServiceWorkerMessageEventInit extends EventInit {
-    data?: any;
-    lastEventId?: string;
-    origin?: string;
-    ports?: MessagePort[] | null;
-    source?: ServiceWorker | MessagePort | null;
-}
-
-interface SpeechSynthesisEventInit extends EventInit {
-    charIndex?: number;
-    charLength?: number;
-    elapsedTime?: number;
-    name?: string;
-    utterance?: SpeechSynthesisUtterance | null;
-}
-
-interface StereoPannerOptions extends AudioNodeOptions {
-    pan?: number;
-}
-
-interface StoreExceptionsInformation extends ExceptionInformation {
-    detailURI?: string | null;
-    explanationString?: string | null;
-    siteName?: string | null;
-}
-
-interface StoreSiteSpecificExceptionsInformation extends StoreExceptionsInformation {
-    arrayOfDomainStrings?: string[];
-}
-
-interface SyncEventInit extends ExtendableEventInit {
-    lastChance?: boolean;
-    tag: string;
-}
-
-interface TextDecodeOptions {
-    stream?: boolean;
-}
-
-interface TextDecoderOptions {
-    fatal?: boolean;
-    ignoreBOM?: boolean;
-}
-
-interface TrackEventInit extends EventInit {
-    track?: VideoTrack | AudioTrack | TextTrack | null;
-}
-
-interface TransitionEventInit extends EventInit {
-    elapsedTime?: number;
-    propertyName?: string;
-}
-
-interface UIEventInit extends EventInit {
-    detail?: number;
-    view?: Window | null;
-}
-
-interface UnderlyingSink {
-    abort?: WritableStreamErrorCallback;
-    close?: WritableStreamDefaultControllerCallback;
-    start: WritableStreamDefaultControllerCallback;
-    write?: WritableStreamChunkCallback;
-}
-
-interface VRDisplayEventInit extends EventInit {
-    display: VRDisplay;
-    reason?: VRDisplayEventReason;
-}
-
-interface VRLayer {
-    leftBounds?: number[] | null;
-    rightBounds?: number[] | null;
-    source?: HTMLCanvasElement | null;
-}
-
-interface VRStageParameters {
-    sittingToStandingTransform?: Float32Array;
-    sizeX?: number;
-    sizeY?: number;
-}
-
-interface WaveShaperOptions extends AudioNodeOptions {
-    curve?: number[];
-    oversample?: OverSampleType;
-}
-
-interface WebAuthnExtensions {
-}
-
-interface WebGLContextAttributes {
-    alpha?: boolean;
-    antialias?: boolean;
-    depth?: boolean;
-    failIfMajorPerformanceCaveat?: boolean;
-    premultipliedAlpha?: boolean;
-    preserveDrawingBuffer?: boolean;
-    stencil?: boolean;
-}
-
-interface WebGLContextEventInit extends EventInit {
-    statusMessage?: string;
-}
-
-interface WheelEventInit extends MouseEventInit {
-    deltaMode?: number;
-    deltaX?: number;
-    deltaY?: number;
-    deltaZ?: number;
-}
-
-interface EventListener {
-    (evt: Event): void;
-}
-
-type WebKitEntriesCallback = ((entries: WebKitEntry[]) => void) | { handleEvent(entries: WebKitEntry[]): void; };
-
-type WebKitErrorCallback = ((err: DOMError) => void) | { handleEvent(err: DOMError): void; };
-
-type WebKitFileCallback = ((file: File) => void) | { handleEvent(file: File): void; };
-
-interface ANGLE_instanced_arrays {
-    drawArraysInstancedANGLE(mode: number, first: number, count: number, primcount: number): void;
-    drawElementsInstancedANGLE(mode: number, count: number, type: number, offset: number, primcount: number): void;
-    vertexAttribDivisorANGLE(index: number, divisor: number): void;
-    readonly VERTEX_ATTRIB_ARRAY_DIVISOR_ANGLE: number;
-}
-
-declare var ANGLE_instanced_arrays: {
-    prototype: ANGLE_instanced_arrays;
-    new(): ANGLE_instanced_arrays;
-    readonly VERTEX_ATTRIB_ARRAY_DIVISOR_ANGLE: number;
-};
-
-interface AbortController {
-    readonly signal: AbortSignal;
-    abort(): void;
-}
-
-declare var AbortController: {
-    prototype: AbortController;
-    new(): AbortController;
-};
-
-interface AbortSignalEventMap {
-    "abort": ProgressEvent;
-}
-
-interface AbortSignal extends EventTarget {
-    readonly aborted: boolean;
-    onabort: ((this: AbortSignal, ev: ProgressEvent) => any) | null;
-    addEventListener<K extends keyof AbortSignalEventMap>(type: K, listener: (this: AbortSignal, ev: AbortSignalEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof AbortSignalEventMap>(type: K, listener: (this: AbortSignal, ev: AbortSignalEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var AbortSignal: {
-    prototype: AbortSignal;
-    new(): AbortSignal;
-};
-
-interface AbstractWorkerEventMap {
-    "error": ErrorEvent;
-}
-
-interface AbstractWorker {
-    onerror: ((this: AbstractWorker, ev: ErrorEvent) => any) | null;
-    addEventListener<K extends keyof AbstractWorkerEventMap>(type: K, listener: (this: AbstractWorker, ev: AbstractWorkerEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof AbstractWorkerEventMap>(type: K, listener: (this: AbstractWorker, ev: AbstractWorkerEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-interface AesCfbParams extends Algorithm {
-    iv: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer;
-}
-
-interface AesCmacParams extends Algorithm {
-    length: number;
-}
-
-interface AnalyserNode extends AudioNode {
-    fftSize: number;
-    readonly frequencyBinCount: number;
-    maxDecibels: number;
-    minDecibels: number;
-    smoothingTimeConstant: number;
-    getByteFrequencyData(array: Uint8Array): void;
-    getByteTimeDomainData(array: Uint8Array): void;
-    getFloatFrequencyData(array: Float32Array): void;
-    getFloatTimeDomainData(array: Float32Array): void;
-}
-
-declare var AnalyserNode: {
-    prototype: AnalyserNode;
-    new(): AnalyserNode;
-};
-
-interface Animation {
-    currentTime: number | null;
-    effect: AnimationEffectReadOnly;
-    readonly finished: Promise<Animation>;
-    id: string;
-    readonly pending: boolean;
-    readonly playState: "idle" | "running" | "paused" | "finished";
-    playbackRate: number;
-    readonly ready: Promise<Animation>;
-    startTime: number;
-    timeline: AnimationTimeline;
-    cancel(): void;
-    finish(): void;
-    oncancel: (this: Animation, ev: AnimationPlaybackEvent) => any;
-    onfinish: (this: Animation, ev: AnimationPlaybackEvent) => any;
-    pause(): void;
-    play(): void;
-    reverse(): void;
-}
-
-declare var Animation: {
-    prototype: Animation;
-    new(effect?: AnimationEffectReadOnly, timeline?: AnimationTimeline): Animation;
-};
-
-interface AnimationEffectReadOnly {
-    readonly timing: number;
-    getComputedTiming(): ComputedTimingProperties;
-}
-
-interface AnimationEvent extends Event {
-    readonly animationName: string;
-    readonly elapsedTime: number;
-}
-
-declare var AnimationEvent: {
-    prototype: AnimationEvent;
-    new(typeArg: string, eventInitDict?: AnimationEventInit): AnimationEvent;
-};
-
-interface AnimationKeyFrame {
-    easing?: string | string[];
-    offset?: number | null | (number | null)[];
-    [index: string]: string | number | number[] | string[] | null | (number | null)[] | undefined;
-}
-
-interface AnimationOptions {
-    delay?: number;
-    direction?: "normal" | "reverse" | "alternate" | "alternate-reverse";
-    duration?: number;
-    easing?: string;
-    endDelay?: number;
-    fill?: "none" | "forwards" | "backwards" | "both"| "auto";
-    id?: string;
-    iterationStart?: number;
-    iterations?: number;
-}
-
-interface AnimationPlaybackEvent extends Event {
-    readonly currentTime: number | null;
-    readonly timelineTime: number | null;
-}
-
-declare var AnimationPlaybackEvent: {
-    prototype: AnimationPlaybackEvent;
-    new(type: string, eventInitDict?: AnimationPlaybackEventInit): AnimationPlaybackEvent;
-};
-
-interface AnimationPlaybackEventInit extends EventInit {
-    currentTime?: number | null;
-    timelineTime?: number | null;
-}
-
-interface AnimationTimeline {
-    readonly currentTime: number | null;
-}
-
-interface ApplicationCacheEventMap {
-    "cached": Event;
-    "checking": Event;
-    "downloading": Event;
-    "error": Event;
-    "noupdate": Event;
-    "obsolete": Event;
-    "progress": ProgressEvent;
-    "updateready": Event;
-}
-
-interface ApplicationCache extends EventTarget {
-    oncached: ((this: ApplicationCache, ev: Event) => any) | null;
-    onchecking: ((this: ApplicationCache, ev: Event) => any) | null;
-    ondownloading: ((this: ApplicationCache, ev: Event) => any) | null;
-    onerror: ((this: ApplicationCache, ev: Event) => any) | null;
-    onnoupdate: ((this: ApplicationCache, ev: Event) => any) | null;
-    onobsolete: ((this: ApplicationCache, ev: Event) => any) | null;
-    onprogress: ((this: ApplicationCache, ev: ProgressEvent) => any) | null;
-    onupdateready: ((this: ApplicationCache, ev: Event) => any) | null;
-    readonly status: number;
-    abort(): void;
-    swapCache(): void;
-    update(): void;
-    readonly CHECKING: number;
-    readonly DOWNLOADING: number;
-    readonly IDLE: number;
-    readonly OBSOLETE: number;
-    readonly UNCACHED: number;
-    readonly UPDATEREADY: number;
-    addEventListener<K extends keyof ApplicationCacheEventMap>(type: K, listener: (this: ApplicationCache, ev: ApplicationCacheEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof ApplicationCacheEventMap>(type: K, listener: (this: ApplicationCache, ev: ApplicationCacheEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var ApplicationCache: {
-    prototype: ApplicationCache;
-    new(): ApplicationCache;
-    readonly CHECKING: number;
-    readonly DOWNLOADING: number;
-    readonly IDLE: number;
-    readonly OBSOLETE: number;
-    readonly UNCACHED: number;
-    readonly UPDATEREADY: number;
-};
-
-interface AssignedNodesOptions {
-    flatten?: boolean;
-}
-
-interface Attr extends Node {
-    readonly name: string;
-    readonly ownerElement: Element | null;
-    readonly prefix: string | null;
-    readonly specified: boolean;
-    value: string;
-}
-
-declare var Attr: {
-    prototype: Attr;
-    new(): Attr;
-};
-
-interface AudioBuffer {
-    readonly duration: number;
-    readonly length: number;
-    readonly numberOfChannels: number;
-    readonly sampleRate: number;
-    copyFromChannel(destination: Float32Array, channelNumber: number, startInChannel?: number): void;
-    copyToChannel(source: Float32Array, channelNumber: number, startInChannel?: number): void;
-    getChannelData(channel: number): Float32Array;
-}
-
-declare var AudioBuffer: {
-    prototype: AudioBuffer;
-    new(): AudioBuffer;
-};
-
-interface AudioBufferSourceNodeEventMap {
-    "ended": Event;
-}
-
-interface AudioBufferSourceNode extends AudioNode {
-    buffer: AudioBuffer | null;
-    readonly detune: AudioParam;
-    loop: boolean;
-    loopEnd: number;
-    loopStart: number;
-    onended: ((this: AudioBufferSourceNode, ev: Event) => any) | null;
-    readonly playbackRate: AudioParam;
-    start(when?: number, offset?: number, duration?: number): void;
-    stop(when?: number): void;
-    addEventListener<K extends keyof AudioBufferSourceNodeEventMap>(type: K, listener: (this: AudioBufferSourceNode, ev: AudioBufferSourceNodeEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof AudioBufferSourceNodeEventMap>(type: K, listener: (this: AudioBufferSourceNode, ev: AudioBufferSourceNodeEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var AudioBufferSourceNode: {
-    prototype: AudioBufferSourceNode;
-    new(): AudioBufferSourceNode;
-};
-
-interface AudioContextEventMap {
-    "statechange": Event;
-}
-
-interface AudioContextBase extends EventTarget {
-    readonly currentTime: number;
-    readonly destination: AudioDestinationNode;
-    readonly listener: AudioListener;
-    onstatechange: ((this: AudioContext, ev: Event) => any) | null;
-    readonly sampleRate: number;
-    readonly state: AudioContextState;
-    close(): Promise<void>;
-    createAnalyser(): AnalyserNode;
-    createBiquadFilter(): BiquadFilterNode;
-    createBuffer(numberOfChannels: number, length: number, sampleRate: number): AudioBuffer;
-    createBufferSource(): AudioBufferSourceNode;
-    createChannelMerger(numberOfInputs?: number): ChannelMergerNode;
-    createChannelSplitter(numberOfOutputs?: number): ChannelSplitterNode;
-    createConvolver(): ConvolverNode;
-    createDelay(maxDelayTime?: number): DelayNode;
-    createDynamicsCompressor(): DynamicsCompressorNode;
-    createGain(): GainNode;
-    createIIRFilter(feedforward: number[], feedback: number[]): IIRFilterNode;
-    createMediaElementSource(mediaElement: HTMLMediaElement): MediaElementAudioSourceNode;
-    createMediaStreamSource(mediaStream: MediaStream): MediaStreamAudioSourceNode;
-    createOscillator(): OscillatorNode;
-    createPanner(): PannerNode;
-    createPeriodicWave(real: Float32Array, imag: Float32Array, constraints?: PeriodicWaveConstraints): PeriodicWave;
-    createScriptProcessor(bufferSize?: number, numberOfInputChannels?: number, numberOfOutputChannels?: number): ScriptProcessorNode;
-    createStereoPanner(): StereoPannerNode;
-    createWaveShaper(): WaveShaperNode;
-    decodeAudioData(audioData: ArrayBuffer, successCallback?: DecodeSuccessCallback, errorCallback?: DecodeErrorCallback): Promise<AudioBuffer>;
-    resume(): Promise<void>;
-    addEventListener<K extends keyof AudioContextEventMap>(type: K, listener: (this: AudioContext, ev: AudioContextEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof AudioContextEventMap>(type: K, listener: (this: AudioContext, ev: AudioContextEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-interface AudioContext extends AudioContextBase {
-    suspend(): Promise<void>;
-}
-
-declare var AudioContext: {
-    prototype: AudioContext;
-    new(): AudioContext;
-};
-
-interface AudioDestinationNode extends AudioNode {
-    readonly maxChannelCount: number;
-}
-
-declare var AudioDestinationNode: {
-    prototype: AudioDestinationNode;
-    new(): AudioDestinationNode;
-};
-
-interface AudioListener {
-    /** @deprecated */
-    dopplerFactor: number;
-    /** @deprecated */
-    speedOfSound: number;
-    /** @deprecated */
-    setOrientation(x: number, y: number, z: number, xUp: number, yUp: number, zUp: number): void;
-    /** @deprecated */
-    setPosition(x: number, y: number, z: number): void;
-    /** @deprecated */
-    setVelocity(x: number, y: number, z: number): void;
-}
-
-declare var AudioListener: {
-    prototype: AudioListener;
-    new(): AudioListener;
-};
-
-interface AudioNode extends EventTarget {
-    channelCount: number;
-    channelCountMode: ChannelCountMode;
-    channelInterpretation: ChannelInterpretation;
-    readonly context: AudioContext;
-    readonly numberOfInputs: number;
-    readonly numberOfOutputs: number;
-    connect(destination: AudioNode, output?: number, input?: number): AudioNode;
-    connect(destination: AudioParam, output?: number): void;
-    disconnect(): void;
-    disconnect(output: number): void;
-    disconnect(destination: AudioNode): void;
-    disconnect(destination: AudioNode, output: number): void;
-    disconnect(destination: AudioNode, output: number, input: number): void;
-    disconnect(destination: AudioParam): void;
-    disconnect(destination: AudioParam, output: number): void;
-}
-
-declare var AudioNode: {
-    prototype: AudioNode;
-    new(): AudioNode;
-};
-
-interface AudioParam {
-    readonly defaultValue: number;
-    value: number;
-    cancelScheduledValues(cancelTime: number): AudioParam;
-    exponentialRampToValueAtTime(value: number, endTime: number): AudioParam;
-    linearRampToValueAtTime(value: number, endTime: number): AudioParam;
-    setTargetAtTime(target: number, startTime: number, timeConstant: number): AudioParam;
-    setValueAtTime(value: number, startTime: number): AudioParam;
-    setValueCurveAtTime(values: number[], startTime: number, duration: number): AudioParam;
-}
-
-declare var AudioParam: {
-    prototype: AudioParam;
-    new(): AudioParam;
-};
-
-interface AudioProcessingEvent extends Event {
-    readonly inputBuffer: AudioBuffer;
-    readonly outputBuffer: AudioBuffer;
-    readonly playbackTime: number;
-}
-
-declare var AudioProcessingEvent: {
-    prototype: AudioProcessingEvent;
-    new(): AudioProcessingEvent;
-};
-
-interface AudioTrack {
-    enabled: boolean;
-    readonly id: string;
-    kind: string;
-    readonly label: string;
-    language: string;
-    readonly sourceBuffer: SourceBuffer;
-}
-
-declare var AudioTrack: {
-    prototype: AudioTrack;
-    new(): AudioTrack;
-};
-
-interface AudioTrackListEventMap {
-    "addtrack": TrackEvent;
-    "change": Event;
-    "removetrack": TrackEvent;
-}
-
-interface AudioTrackList extends EventTarget {
-    readonly length: number;
-    onaddtrack: ((this: AudioTrackList, ev: TrackEvent) => any) | null;
-    onchange: ((this: AudioTrackList, ev: Event) => any) | null;
-    onremovetrack: ((this: AudioTrackList, ev: TrackEvent) => any) | null;
-    getTrackById(id: string): AudioTrack | null;
-    item(index: number): AudioTrack;
-    addEventListener<K extends keyof AudioTrackListEventMap>(type: K, listener: (this: AudioTrackList, ev: AudioTrackListEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof AudioTrackListEventMap>(type: K, listener: (this: AudioTrackList, ev: AudioTrackListEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-    [index: number]: AudioTrack;
-}
-
-declare var AudioTrackList: {
-    prototype: AudioTrackList;
-    new(): AudioTrackList;
-};
-
-interface BarProp {
-    readonly visible: boolean;
-}
-
-declare var BarProp: {
-    prototype: BarProp;
-    new(): BarProp;
-};
-
-interface BeforeUnloadEvent extends Event {
-    returnValue: any;
-}
-
-declare var BeforeUnloadEvent: {
-    prototype: BeforeUnloadEvent;
-    new(): BeforeUnloadEvent;
-};
-
-interface BhxBrowser {
-    readonly lastError: DOMException;
-    checkMatchesGlobExpression(pattern: string, value: string): boolean;
-    checkMatchesUriExpression(pattern: string, value: string): boolean;
-    clearLastError(): void;
-    currentWindowId(): number;
-    fireExtensionApiTelemetry(functionName: string, isSucceeded: boolean, isSupported: boolean, errorString: string): void;
-    genericFunction(functionId: number, destination: any, parameters?: string, callbackId?: number): void;
-    genericSynchronousFunction(functionId: number, parameters?: string): string;
-    getExtensionId(): string;
-    getThisAddress(): any;
-    registerGenericFunctionCallbackHandler(callbackHandler: Function): void;
-    registerGenericListenerHandler(eventHandler: Function): void;
-    setLastError(parameters: string): void;
-    webPlatformGenericFunction(destination: any, parameters?: string, callbackId?: number): void;
-}
-
-declare var BhxBrowser: {
-    prototype: BhxBrowser;
-    new(): BhxBrowser;
-};
-
-interface BiquadFilterNode extends AudioNode {
-    readonly Q: AudioParam;
-    readonly detune: AudioParam;
-    readonly frequency: AudioParam;
-    readonly gain: AudioParam;
-    type: BiquadFilterType;
-    getFrequencyResponse(frequencyHz: Float32Array, magResponse: Float32Array, phaseResponse: Float32Array): void;
-}
-
-declare var BiquadFilterNode: {
-    prototype: BiquadFilterNode;
-    new(): BiquadFilterNode;
-};
-
-interface Blob {
-    readonly size: number;
-    readonly type: string;
-    msClose(): void;
-    msDetachStream(): any;
-    slice(start?: number, end?: number, contentType?: string): Blob;
-}
-
-declare var Blob: {
-    prototype: Blob;
-    new (blobParts?: any[], options?: BlobPropertyBag): Blob;
-};
-
-interface BlobPropertyBag {
-    endings?: string;
-    type?: string;
-}
-
-interface Body {
-    readonly bodyUsed: boolean;
-    arrayBuffer(): Promise<ArrayBuffer>;
-    blob(): Promise<Blob>;
-    formData(): Promise<FormData>;
-    json(): Promise<any>;
-    text(): Promise<string>;
-}
-
-interface BroadcastChannel extends EventTarget {
-    readonly name: string;
-    onmessage: (ev: MessageEvent) => any;
-    onmessageerror: (ev: MessageEvent) => any;
-    addEventListener<K extends keyof BroadcastChannelEventMap>(type: K, listener: (this: BroadcastChannel, ev: BroadcastChannelEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    close(): void;
-    postMessage(message: any): void;
-    removeEventListener<K extends keyof BroadcastChannelEventMap>(type: K, listener: (this: BroadcastChannel, ev: BroadcastChannelEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var BroadcastChannel: {
-    prototype: BroadcastChannel;
-    new(name: string): BroadcastChannel;
-};
-
-interface BroadcastChannelEventMap {
-    message: MessageEvent;
-    messageerror: MessageEvent;
-}
-
-interface ByteLengthQueuingStrategy {
-    highWaterMark: number;
-    size(chunk?: any): number;
-}
-
-declare var ByteLengthQueuingStrategy: {
-    prototype: ByteLengthQueuingStrategy;
-    new(strategy: QueuingStrategy): ByteLengthQueuingStrategy;
-};
-
-interface CDATASection extends Text {
-}
-
-declare var CDATASection: {
-    prototype: CDATASection;
-    new(): CDATASection;
-};
-
-interface CSS {
-    escape(value: string): string;
-    supports(property: string, value?: string): boolean;
-}
-declare var CSS: CSS;
-
-interface CSSConditionRule extends CSSGroupingRule {
-    conditionText: string;
-}
-
-declare var CSSConditionRule: {
-    prototype: CSSConditionRule;
-    new(): CSSConditionRule;
-};
-
-interface CSSFontFaceRule extends CSSRule {
-    readonly style: CSSStyleDeclaration;
-}
-
-declare var CSSFontFaceRule: {
-    prototype: CSSFontFaceRule;
-    new(): CSSFontFaceRule;
-};
-
-interface CSSGroupingRule extends CSSRule {
-    readonly cssRules: CSSRuleList;
-    deleteRule(index: number): void;
-    insertRule(rule: string, index: number): number;
-}
-
-declare var CSSGroupingRule: {
-    prototype: CSSGroupingRule;
-    new(): CSSGroupingRule;
-};
-
-interface CSSImportRule extends CSSRule {
-    readonly href: string;
-    readonly media: MediaList;
-    readonly styleSheet: CSSStyleSheet;
-}
-
-declare var CSSImportRule: {
-    prototype: CSSImportRule;
-    new(): CSSImportRule;
-};
-
-interface CSSKeyframeRule extends CSSRule {
-    keyText: string;
-    readonly style: CSSStyleDeclaration;
-}
-
-declare var CSSKeyframeRule: {
-    prototype: CSSKeyframeRule;
-    new(): CSSKeyframeRule;
-};
-
-interface CSSKeyframesRule extends CSSRule {
-    readonly cssRules: CSSRuleList;
-    name: string;
-    appendRule(rule: string): void;
-    deleteRule(rule: string): void;
-    findRule(rule: string): CSSKeyframeRule | null;
-}
-
-declare var CSSKeyframesRule: {
-    prototype: CSSKeyframesRule;
-    new(): CSSKeyframesRule;
-};
-
-interface CSSMediaRule extends CSSConditionRule {
-    readonly media: MediaList;
-}
-
-declare var CSSMediaRule: {
-    prototype: CSSMediaRule;
-    new(): CSSMediaRule;
-};
-
-interface CSSNamespaceRule extends CSSRule {
-    readonly namespaceURI: string;
-    readonly prefix: string;
-}
-
-declare var CSSNamespaceRule: {
-    prototype: CSSNamespaceRule;
-    new(): CSSNamespaceRule;
-};
-
-interface CSSPageRule extends CSSRule {
-    readonly pseudoClass: string;
-    readonly selector: string;
-    selectorText: string;
-    readonly style: CSSStyleDeclaration;
-}
-
-declare var CSSPageRule: {
-    prototype: CSSPageRule;
-    new(): CSSPageRule;
-};
-
-interface CSSRule {
-    cssText: string;
-    readonly parentRule: CSSRule | null;
-    readonly parentStyleSheet: CSSStyleSheet | null;
-    readonly type: number;
-    readonly CHARSET_RULE: number;
-    readonly FONT_FACE_RULE: number;
-    readonly IMPORT_RULE: number;
-    readonly KEYFRAMES_RULE: number;
-    readonly KEYFRAME_RULE: number;
-    readonly MEDIA_RULE: number;
-    readonly NAMESPACE_RULE: number;
-    readonly PAGE_RULE: number;
-    readonly STYLE_RULE: number;
-    readonly SUPPORTS_RULE: number;
-    readonly UNKNOWN_RULE: number;
-    readonly VIEWPORT_RULE: number;
-}
-
-declare var CSSRule: {
-    prototype: CSSRule;
-    new(): CSSRule;
-    readonly CHARSET_RULE: number;
-    readonly FONT_FACE_RULE: number;
-    readonly IMPORT_RULE: number;
-    readonly KEYFRAMES_RULE: number;
-    readonly KEYFRAME_RULE: number;
-    readonly MEDIA_RULE: number;
-    readonly NAMESPACE_RULE: number;
-    readonly PAGE_RULE: number;
-    readonly STYLE_RULE: number;
-    readonly SUPPORTS_RULE: number;
-    readonly UNKNOWN_RULE: number;
-    readonly VIEWPORT_RULE: number;
-};
-
-interface CSSRuleList {
-    readonly length: number;
-    item(index: number): CSSRule | null;
-    [index: number]: CSSRule;
-}
-
-declare var CSSRuleList: {
-    prototype: CSSRuleList;
-    new(): CSSRuleList;
-};
-
-interface CSSStyleDeclaration {
-    alignContent: string | null;
-    alignItems: string | null;
-    alignSelf: string | null;
-    alignmentBaseline: string | null;
-    animation: string | null;
-    animationDelay: string | null;
-    animationDirection: string | null;
-    animationDuration: string | null;
-    animationFillMode: string | null;
-    animationIterationCount: string | null;
-    animationName: string | null;
-    animationPlayState: string | null;
-    animationTimingFunction: string | null;
-    backfaceVisibility: string | null;
-    background: string | null;
-    backgroundAttachment: string | null;
-    backgroundClip: string | null;
-    backgroundColor: string | null;
-    backgroundImage: string | null;
-    backgroundOrigin: string | null;
-    backgroundPosition: string | null;
-    backgroundPositionX: string | null;
-    backgroundPositionY: string | null;
-    backgroundRepeat: string | null;
-    backgroundSize: string | null;
-    baselineShift: string | null;
-    border: string | null;
-    borderBottom: string | null;
-    borderBottomColor: string | null;
-    borderBottomLeftRadius: string | null;
-    borderBottomRightRadius: string | null;
-    borderBottomStyle: string | null;
-    borderBottomWidth: string | null;
-    borderCollapse: string | null;
-    borderColor: string | null;
-    borderImage: string | null;
-    borderImageOutset: string | null;
-    borderImageRepeat: string | null;
-    borderImageSlice: string | null;
-    borderImageSource: string | null;
-    borderImageWidth: string | null;
-    borderLeft: string | null;
-    borderLeftColor: string | null;
-    borderLeftStyle: string | null;
-    borderLeftWidth: string | null;
-    borderRadius: string | null;
-    borderRight: string | null;
-    borderRightColor: string | null;
-    borderRightStyle: string | null;
-    borderRightWidth: string | null;
-    borderSpacing: string | null;
-    borderStyle: string | null;
-    borderTop: string | null;
-    borderTopColor: string | null;
-    borderTopLeftRadius: string | null;
-    borderTopRightRadius: string | null;
-    borderTopStyle: string | null;
-    borderTopWidth: string | null;
-    borderWidth: string | null;
-    bottom: string | null;
-    boxShadow: string | null;
-    boxSizing: string | null;
-    breakAfter: string | null;
-    breakBefore: string | null;
-    breakInside: string | null;
-    captionSide: string | null;
-    clear: string | null;
-    clip: string | null;
-    clipPath: string | null;
-    clipRule: string | null;
-    color: string | null;
-    colorInterpolationFilters: string | null;
-    columnCount: any;
-    columnFill: string | null;
-    columnGap: any;
-    columnRule: string | null;
-    columnRuleColor: any;
-    columnRuleStyle: string | null;
-    columnRuleWidth: any;
-    columnSpan: string | null;
-    columnWidth: any;
-    columns: string | null;
-    content: string | null;
-    counterIncrement: string | null;
-    counterReset: string | null;
-    cssFloat: string | null;
-    cssText: string;
-    cursor: string | null;
-    direction: string | null;
-    display: string | null;
-    dominantBaseline: string | null;
-    emptyCells: string | null;
-    enableBackground: string | null;
-    fill: string | null;
-    fillOpacity: string | null;
-    fillRule: string | null;
-    filter: string | null;
-    flex: string | null;
-    flexBasis: string | null;
-    flexDirection: string | null;
-    flexFlow: string | null;
-    flexGrow: string | null;
-    flexShrink: string | null;
-    flexWrap: string | null;
-    floodColor: string | null;
-    floodOpacity: string | null;
-    font: string | null;
-    fontFamily: string | null;
-    fontFeatureSettings: string | null;
-    fontSize: string | null;
-    fontSizeAdjust: string | null;
-    fontStretch: string | null;
-    fontStyle: string | null;
-    fontVariant: string | null;
-    fontWeight: string | null;
-    gap: string | null;
-    glyphOrientationHorizontal: string | null;
-    glyphOrientationVertical: string | null;
-    grid: string | null;
-    gridArea: string | null;
-    gridAutoColumns: string | null;
-    gridAutoFlow: string | null;
-    gridAutoRows: string | null;
-    gridColumn: string | null;
-    gridColumnEnd: string | null;
-    gridColumnGap: string | null;
-    gridColumnStart: string | null;
-    gridGap: string | null;
-    gridRow: string | null;
-    gridRowEnd: string | null;
-    gridRowGap: string | null;
-    gridRowStart: string | null;
-    gridTemplate: string | null;
-    gridTemplateAreas: string | null;
-    gridTemplateColumns: string | null;
-    gridTemplateRows: string | null;
-    height: string | null;
-    imeMode: string | null;
-    justifyContent: string | null;
-    justifyItems: string | null;
-    justifySelf: string | null;
-    kerning: string | null;
-    layoutGrid: string | null;
-    layoutGridChar: string | null;
-    layoutGridLine: string | null;
-    layoutGridMode: string | null;
-    layoutGridType: string | null;
-    left: string | null;
-    readonly length: number;
-    letterSpacing: string | null;
-    lightingColor: string | null;
-    lineBreak: string | null;
-    lineHeight: string | null;
-    listStyle: string | null;
-    listStyleImage: string | null;
-    listStylePosition: string | null;
-    listStyleType: string | null;
-    margin: string | null;
-    marginBottom: string | null;
-    marginLeft: string | null;
-    marginRight: string | null;
-    marginTop: string | null;
-    marker: string | null;
-    markerEnd: string | null;
-    markerMid: string | null;
-    markerStart: string | null;
-    mask: string | null;
-    maskImage: string | null;
-    maxHeight: string | null;
-    maxWidth: string | null;
-    minHeight: string | null;
-    minWidth: string | null;
-    msContentZoomChaining: string | null;
-    msContentZoomLimit: string | null;
-    msContentZoomLimitMax: any;
-    msContentZoomLimitMin: any;
-    msContentZoomSnap: string | null;
-    msContentZoomSnapPoints: string | null;
-    msContentZoomSnapType: string | null;
-    msContentZooming: string | null;
-    msFlowFrom: string | null;
-    msFlowInto: string | null;
-    msFontFeatureSettings: string | null;
-    msGridColumn: any;
-    msGridColumnAlign: string | null;
-    msGridColumnSpan: any;
-    msGridColumns: string | null;
-    msGridRow: any;
-    msGridRowAlign: string | null;
-    msGridRowSpan: any;
-    msGridRows: string | null;
-    msHighContrastAdjust: string | null;
-    msHyphenateLimitChars: string | null;
-    msHyphenateLimitLines: any;
-    msHyphenateLimitZone: any;
-    msHyphens: string | null;
-    msImeAlign: string | null;
-    msOverflowStyle: string | null;
-    msScrollChaining: string | null;
-    msScrollLimit: string | null;
-    msScrollLimitXMax: any;
-    msScrollLimitXMin: any;
-    msScrollLimitYMax: any;
-    msScrollLimitYMin: any;
-    msScrollRails: string | null;
-    msScrollSnapPointsX: string | null;
-    msScrollSnapPointsY: string | null;
-    msScrollSnapType: string | null;
-    msScrollSnapX: string | null;
-    msScrollSnapY: string | null;
-    msScrollTranslation: string | null;
-    msTextCombineHorizontal: string | null;
-    msTextSizeAdjust: any;
-    msTouchAction: string | null;
-    msTouchSelect: string | null;
-    msUserSelect: string | null;
-    msWrapFlow: string;
-    msWrapMargin: any;
-    msWrapThrough: string;
-    objectFit: string | null;
-    objectPosition: string | null;
-    opacity: string | null;
-    order: string | null;
-    orphans: string | null;
-    outline: string | null;
-    outlineColor: string | null;
-    outlineOffset: string | null;
-    outlineStyle: string | null;
-    outlineWidth: string | null;
-    overflow: string | null;
-    overflowX: string | null;
-    overflowY: string | null;
-    padding: string | null;
-    paddingBottom: string | null;
-    paddingLeft: string | null;
-    paddingRight: string | null;
-    paddingTop: string | null;
-    pageBreakAfter: string | null;
-    pageBreakBefore: string | null;
-    pageBreakInside: string | null;
-    readonly parentRule: CSSRule;
-    penAction: string | null;
-    perspective: string | null;
-    perspectiveOrigin: string | null;
-    pointerEvents: string | null;
-    position: string | null;
-    quotes: string | null;
-    resize: string | null;
-    right: string | null;
-    rotate: string | null;
-    rowGap: string | null;
-    rubyAlign: string | null;
-    rubyOverhang: string | null;
-    rubyPosition: string | null;
-    scale: string | null;
-    stopColor: string | null;
-    stopOpacity: string | null;
-    stroke: string | null;
-    strokeDasharray: string | null;
-    strokeDashoffset: string | null;
-    strokeLinecap: string | null;
-    strokeLinejoin: string | null;
-    strokeMiterlimit: string | null;
-    strokeOpacity: string | null;
-    strokeWidth: string | null;
-    tableLayout: string | null;
-    textAlign: string | null;
-    textAlignLast: string | null;
-    textAnchor: string | null;
-    textCombineUpright: string | null;
-    textDecoration: string | null;
-    textIndent: string | null;
-    textJustify: string | null;
-    textKashida: string | null;
-    textKashidaSpace: string | null;
-    textOverflow: string | null;
-    textShadow: string | null;
-    textTransform: string | null;
-    textUnderlinePosition: string | null;
-    top: string | null;
-    touchAction: string | null;
-    transform: string | null;
-    transformOrigin: string | null;
-    transformStyle: string | null;
-    transition: string | null;
-    transitionDelay: string | null;
-    transitionDuration: string | null;
-    transitionProperty: string | null;
-    transitionTimingFunction: string | null;
-    translate: string | null;
-    unicodeBidi: string | null;
-    userSelect: string | null;
-    verticalAlign: string | null;
-    visibility: string | null;
-    webkitAlignContent: string | null;
-    webkitAlignItems: string | null;
-    webkitAlignSelf: string | null;
-    webkitAnimation: string | null;
-    webkitAnimationDelay: string | null;
-    webkitAnimationDirection: string | null;
-    webkitAnimationDuration: string | null;
-    webkitAnimationFillMode: string | null;
-    webkitAnimationIterationCount: string | null;
-    webkitAnimationName: string | null;
-    webkitAnimationPlayState: string | null;
-    webkitAnimationTimingFunction: string | null;
-    webkitAppearance: string | null;
-    webkitBackfaceVisibility: string | null;
-    webkitBackgroundClip: string | null;
-    webkitBackgroundOrigin: string | null;
-    webkitBackgroundSize: string | null;
-    webkitBorderBottomLeftRadius: string | null;
-    webkitBorderBottomRightRadius: string | null;
-    webkitBorderImage: string | null;
-    webkitBorderRadius: string | null;
-    webkitBorderTopLeftRadius: string | null;
-    webkitBorderTopRightRadius: string | null;
-    webkitBoxAlign: string | null;
-    webkitBoxDirection: string | null;
-    webkitBoxFlex: string | null;
-    webkitBoxOrdinalGroup: string | null;
-    webkitBoxOrient: string | null;
-    webkitBoxPack: string | null;
-    webkitBoxSizing: string | null;
-    webkitColumnBreakAfter: string | null;
-    webkitColumnBreakBefore: string | null;
-    webkitColumnBreakInside: string | null;
-    webkitColumnCount: any;
-    webkitColumnGap: any;
-    webkitColumnRule: string | null;
-    webkitColumnRuleColor: any;
-    webkitColumnRuleStyle: string | null;
-    webkitColumnRuleWidth: any;
-    webkitColumnSpan: string | null;
-    webkitColumnWidth: any;
-    webkitColumns: string | null;
-    webkitFilter: string | null;
-    webkitFlex: string | null;
-    webkitFlexBasis: string | null;
-    webkitFlexDirection: string | null;
-    webkitFlexFlow: string | null;
-    webkitFlexGrow: string | null;
-    webkitFlexShrink: string | null;
-    webkitFlexWrap: string | null;
-    webkitJustifyContent: string | null;
-    webkitOrder: string | null;
-    webkitPerspective: string | null;
-    webkitPerspectiveOrigin: string | null;
-    webkitTapHighlightColor: string | null;
-    webkitTextFillColor: string | null;
-    webkitTextSizeAdjust: any;
-    webkitTextStroke: string | null;
-    webkitTextStrokeColor: string | null;
-    webkitTextStrokeWidth: string | null;
-    webkitTransform: string | null;
-    webkitTransformOrigin: string | null;
-    webkitTransformStyle: string | null;
-    webkitTransition: string | null;
-    webkitTransitionDelay: string | null;
-    webkitTransitionDuration: string | null;
-    webkitTransitionProperty: string | null;
-    webkitTransitionTimingFunction: string | null;
-    webkitUserModify: string | null;
-    webkitUserSelect: string | null;
-    webkitWritingMode: string | null;
-    whiteSpace: string | null;
-    widows: string | null;
-    width: string | null;
-    wordBreak: string | null;
-    wordSpacing: string | null;
-    wordWrap: string | null;
-    writingMode: string | null;
-    zIndex: string | null;
-    zoom: string | null;
-    getPropertyPriority(propertyName: string): string;
-    getPropertyValue(propertyName: string): string;
-    item(index: number): string;
-    removeProperty(propertyName: string): string;
-    setProperty(propertyName: string, value: string | null, priority?: string | null): void;
-    [index: number]: string;
-}
-
-declare var CSSStyleDeclaration: {
-    prototype: CSSStyleDeclaration;
-    new(): CSSStyleDeclaration;
-};
-
-interface CSSStyleRule extends CSSRule {
-    selectorText: string;
-    readonly style: CSSStyleDeclaration;
-}
-
-declare var CSSStyleRule: {
-    prototype: CSSStyleRule;
-    new(): CSSStyleRule;
-};
-
-interface CSSStyleSheet extends StyleSheet {
-    readonly cssRules: CSSRuleList;
-    /** @deprecated */
-    cssText: string;
-    /** @deprecated */
-    readonly id: string;
-    /** @deprecated */
-    readonly imports: StyleSheetList;
-    /** @deprecated */
-    readonly isAlternate: boolean;
-    /** @deprecated */
-    readonly isPrefAlternate: boolean;
-    readonly ownerRule: CSSRule | null;
-    /** @deprecated */
-    readonly owningElement: Element;
-    /** @deprecated */
-    readonly pages: any;
-    /** @deprecated */
-    readonly readOnly: boolean;
-    readonly rules: CSSRuleList;
-    /** @deprecated */
-    addImport(bstrURL: string, lIndex?: number): number;
-    /** @deprecated */
-    addPageRule(bstrSelector: string, bstrStyle: string, lIndex?: number): number;
-    addRule(bstrSelector: string, bstrStyle?: string, lIndex?: number): number;
-    deleteRule(index?: number): void;
-    insertRule(rule: string, index?: number): number;
-    /** @deprecated */
-    removeImport(lIndex: number): void;
-    removeRule(lIndex: number): void;
-}
-
-declare var CSSStyleSheet: {
-    prototype: CSSStyleSheet;
-    new(): CSSStyleSheet;
-};
-
-interface CSSSupportsRule extends CSSConditionRule {
-}
-
-declare var CSSSupportsRule: {
-    prototype: CSSSupportsRule;
-    new(): CSSSupportsRule;
-};
-
-interface Cache {
-    add(request: Request | string): Promise<void>;
-    addAll(requests: (Request | string)[]): Promise<void>;
-    delete(request: Request | string, options?: CacheQueryOptions): Promise<boolean>;
-    keys(request?: Request | string, options?: CacheQueryOptions): Promise<Request[]>;
-    match(request: Request | string, options?: CacheQueryOptions): Promise<Response>;
-    matchAll(request?: Request | string, options?: CacheQueryOptions): Promise<Response[]>;
-    put(request: Request | string, response: Response): Promise<void>;
-}
-
-declare var Cache: {
-    prototype: Cache;
-    new(): Cache;
-};
-
-interface CacheStorage {
-    delete(cacheName: string): Promise<boolean>;
-    has(cacheName: string): Promise<boolean>;
-    keys(): Promise<string[]>;
-    match(request: Request | string, options?: CacheQueryOptions): Promise<any>;
-    open(cacheName: string): Promise<Cache>;
-}
-
-declare var CacheStorage: {
-    prototype: CacheStorage;
-    new(): CacheStorage;
-};
-
-interface Canvas2DContextAttributes {
-    alpha?: boolean;
-    storage?: boolean;
-    willReadFrequently?: boolean;
-    [attribute: string]: boolean | string | undefined;
-}
-
-interface CanvasGradient {
-    addColorStop(offset: number, color: string): void;
-}
-
-declare var CanvasGradient: {
-    prototype: CanvasGradient;
-    new(): CanvasGradient;
-};
-
-interface CanvasPathMethods {
-    arc(x: number, y: number, radius: number, startAngle: number, endAngle: number, anticlockwise?: boolean): void;
-    arcTo(x1: number, y1: number, x2: number, y2: number, radius: number): void;
-    arcTo(x1: number, y1: number, x2: number, y2: number, radiusX: number, radiusY: number, rotation: number): void;
-    bezierCurveTo(cp1x: number, cp1y: number, cp2x: number, cp2y: number, x: number, y: number): void;
-    closePath(): void;
-    ellipse(x: number, y: number, radiusX: number, radiusY: number, rotation: number, startAngle: number, endAngle: number, anticlockwise?: boolean): void;
-    lineTo(x: number, y: number): void;
-    moveTo(x: number, y: number): void;
-    quadraticCurveTo(cpx: number, cpy: number, x: number, y: number): void;
-    rect(x: number, y: number, w: number, h: number): void;
-}
-
-interface CanvasPattern {
-    setTransform(matrix: SVGMatrix): void;
-}
-
-declare var CanvasPattern: {
-    prototype: CanvasPattern;
-    new(): CanvasPattern;
-};
-
-interface CanvasRenderingContext2D extends CanvasPathMethods {
-    readonly canvas: HTMLCanvasElement;
-    fillStyle: string | CanvasGradient | CanvasPattern;
-    font: string;
-    globalAlpha: number;
-    globalCompositeOperation: string;
-    imageSmoothingEnabled: boolean;
-    lineCap: string;
-    lineDashOffset: number;
-    lineJoin: string;
-    lineWidth: number;
-    miterLimit: number;
-    mozImageSmoothingEnabled: boolean;
-    msFillRule: CanvasFillRule;
-    oImageSmoothingEnabled: boolean;
-    shadowBlur: number;
-    shadowColor: string;
-    shadowOffsetX: number;
-    shadowOffsetY: number;
-    strokeStyle: string | CanvasGradient | CanvasPattern;
-    textAlign: string;
-    textBaseline: string;
-    webkitImageSmoothingEnabled: boolean;
-    beginPath(): void;
-    clearRect(x: number, y: number, w: number, h: number): void;
-    clip(fillRule?: CanvasFillRule): void;
-    clip(path: Path2D, fillRule?: CanvasFillRule): void;
-    createImageData(imageDataOrSw: number | ImageData, sh?: number): ImageData;
-    createLinearGradient(x0: number, y0: number, x1: number, y1: number): CanvasGradient;
-    createPattern(image: HTMLImageElement | HTMLCanvasElement | HTMLVideoElement, repetition: string): CanvasPattern;
-    createRadialGradient(x0: number, y0: number, r0: number, x1: number, y1: number, r1: number): CanvasGradient;
-    drawFocusIfNeeded(element: Element): void;
-    drawFocusIfNeeded(path: Path2D, element: Element): void;
-    drawImage(image: HTMLImageElement | HTMLCanvasElement | HTMLVideoElement | ImageBitmap, dstX: number, dstY: number): void;
-    drawImage(image: HTMLImageElement | HTMLCanvasElement | HTMLVideoElement | ImageBitmap, dstX: number, dstY: number, dstW: number, dstH: number): void;
-    drawImage(image: HTMLImageElement | HTMLCanvasElement | HTMLVideoElement | ImageBitmap, srcX: number, srcY: number, srcW: number, srcH: number, dstX: number, dstY: number, dstW: number, dstH: number): void;
-    fill(fillRule?: CanvasFillRule): void;
-    fill(path: Path2D, fillRule?: CanvasFillRule): void;
-    fillRect(x: number, y: number, w: number, h: number): void;
-    fillText(text: string, x: number, y: number, maxWidth?: number): void;
-    getImageData(sx: number, sy: number, sw: number, sh: number): ImageData;
-    getLineDash(): number[];
-    isPointInPath(x: number, y: number, fillRule?: CanvasFillRule): boolean;
-    isPointInPath(path: Path2D, x: number, y: number, fillRule?: CanvasFillRule): boolean;
-    isPointInStroke(x: number, y: number, fillRule?: CanvasFillRule): boolean;
-    isPointInStroke(path: Path2D, x: number, y: number, fillRule?: CanvasFillRule): boolean;
-    measureText(text: string): TextMetrics;
-    putImageData(imagedata: ImageData, dx: number, dy: number, dirtyX?: number, dirtyY?: number, dirtyWidth?: number, dirtyHeight?: number): void;
-    restore(): void;
-    rotate(angle: number): void;
-    save(): void;
-    scale(x: number, y: number): void;
-    setLineDash(segments: number[]): void;
-    setTransform(m11: number, m12: number, m21: number, m22: number, dx: number, dy: number): void;
-    stroke(path?: Path2D): void;
-    strokeRect(x: number, y: number, w: number, h: number): void;
-    strokeText(text: string, x: number, y: number, maxWidth?: number): void;
-    transform(m11: number, m12: number, m21: number, m22: number, dx: number, dy: number): void;
-    translate(x: number, y: number): void;
-}
-
-declare var CanvasRenderingContext2D: {
-    prototype: CanvasRenderingContext2D;
-    new(): CanvasRenderingContext2D;
-};
-
-interface ChannelMergerNode extends AudioNode {
-}
-
-declare var ChannelMergerNode: {
-    prototype: ChannelMergerNode;
-    new(): ChannelMergerNode;
-};
-
-interface ChannelSplitterNode extends AudioNode {
-}
-
-declare var ChannelSplitterNode: {
-    prototype: ChannelSplitterNode;
-    new(): ChannelSplitterNode;
-};
-
-interface CharacterData extends Node, ChildNode {
-    data: string;
-    readonly length: number;
-    appendData(arg: string): void;
-    deleteData(offset: number, count: number): void;
-    insertData(offset: number, arg: string): void;
-    replaceData(offset: number, count: number, arg: string): void;
-    substringData(offset: number, count: number): string;
-}
-
-declare var CharacterData: {
-    prototype: CharacterData;
-    new(): CharacterData;
-};
-
-interface ChildNode {
-    remove(): void;
-}
-
-interface ClientRect {
-    bottom: number;
-    readonly height: number;
-    left: number;
-    right: number;
-    top: number;
-    readonly width: number;
-}
-
-declare var ClientRect: {
-    prototype: ClientRect;
-    new(): ClientRect;
-};
-
-interface ClientRectList {
-    readonly length: number;
-    item(index: number): ClientRect;
-    [index: number]: ClientRect;
-}
-
-declare var ClientRectList: {
-    prototype: ClientRectList;
-    new(): ClientRectList;
-};
-
-interface ClipboardEvent extends Event {
-    readonly clipboardData: DataTransfer;
-}
-
-declare var ClipboardEvent: {
-    prototype: ClipboardEvent;
-    new(type: string, eventInitDict?: ClipboardEventInit): ClipboardEvent;
-};
-
-interface ClipboardEventInit extends EventInit {
-    data?: string;
-    dataType?: string;
-}
-
-interface CloseEvent extends Event {
-    readonly code: number;
-    readonly reason: string;
-    readonly wasClean: boolean;
-    /** @deprecated */
-    initCloseEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, wasCleanArg: boolean, codeArg: number, reasonArg: string): void;
-}
-
-declare var CloseEvent: {
-    prototype: CloseEvent;
-    new(type: string, eventInitDict?: CloseEventInit): CloseEvent;
-};
-
-interface Comment extends CharacterData {
-    text: string;
-}
-
-declare var Comment: {
-    prototype: Comment;
-    new(data?: string): Comment;
-};
-
-interface CompositionEvent extends UIEvent {
-    readonly data: string;
-    readonly locale: string;
-    initCompositionEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, dataArg: string, locale: string): void;
-}
-
-declare var CompositionEvent: {
-    prototype: CompositionEvent;
-    new(typeArg: string, eventInitDict?: CompositionEventInit): CompositionEvent;
-};
-
-interface ComputedTimingProperties {
-    activeDuration: number;
-    currentIteration: number | null;
-    endTime: number;
-    localTime: number | null;
-    progress: number | null;
-}
-
-interface ConcatParams extends Algorithm {
-    algorithmId: Uint8Array;
-    hash?: string | Algorithm;
-    partyUInfo: Uint8Array;
-    partyVInfo: Uint8Array;
-    privateInfo?: Uint8Array;
-    publicInfo?: Uint8Array;
-}
-
-interface Console {
-    memory: any;
-    assert(condition?: boolean, message?: string, ...data: any[]): void;
-    clear(): void;
-    count(label?: string): void;
-    debug(message?: any, ...optionalParams: any[]): void;
-    dir(value?: any, ...optionalParams: any[]): void;
-    dirxml(value: any): void;
-    error(message?: any, ...optionalParams: any[]): void;
-    exception(message?: string, ...optionalParams: any[]): void;
-    group(groupTitle?: string, ...optionalParams: any[]): void;
-    groupCollapsed(groupTitle?: string, ...optionalParams: any[]): void;
-    groupEnd(): void;
-    info(message?: any, ...optionalParams: any[]): void;
-    log(message?: any, ...optionalParams: any[]): void;
-    markTimeline(label?: string): void;
-    msIsIndependentlyComposed(element: Element): boolean;
-    profile(reportName?: string): void;
-    profileEnd(): void;
-    select(element: Element): void;
-    table(...tabularData: any[]): void;
-    time(label?: string): void;
-    timeEnd(label?: string): void;
-    timeStamp(label?: string): void;
-    timeline(label?: string): void;
-    timelineEnd(label?: string): void;
-    trace(message?: any, ...optionalParams: any[]): void;
-    warn(message?: any, ...optionalParams: any[]): void;
-}
-
-declare var Console: {
-    prototype: Console;
-    new(): Console;
-};
-
-interface ContentScriptGlobalScope extends EventTarget {
-    readonly msContentScript: ExtensionScriptApis;
-    readonly window: Window;
-}
-
-declare var ContentScriptGlobalScope: {
-    prototype: ContentScriptGlobalScope;
-    new(): ContentScriptGlobalScope;
-};
-
-interface ConvolverNode extends AudioNode {
-    buffer: AudioBuffer | null;
-    normalize: boolean;
-}
-
-declare var ConvolverNode: {
-    prototype: ConvolverNode;
-    new(): ConvolverNode;
-};
-
-interface Coordinates {
-    readonly accuracy: number;
-    readonly altitude: number | null;
-    readonly altitudeAccuracy: number | null;
-    readonly heading: number | null;
-    readonly latitude: number;
-    readonly longitude: number;
-    readonly speed: number | null;
-}
-
-declare var Coordinates: {
-    prototype: Coordinates;
-    new(): Coordinates;
-};
-
-interface CountQueuingStrategy {
-    highWaterMark: number;
-    size(): number;
-}
-
-declare var CountQueuingStrategy: {
-    prototype: CountQueuingStrategy;
-    new(strategy: QueuingStrategy): CountQueuingStrategy;
-};
-
-interface Crypto {
-    readonly subtle: SubtleCrypto;
-    getRandomValues(array: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | null): Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | null;
-}
-
-declare var Crypto: {
-    prototype: Crypto;
-    new(): Crypto;
-};
-
-interface CryptoKey {
-    readonly algorithm: KeyAlgorithm;
-    readonly extractable: boolean;
-    readonly type: string;
-    readonly usages: string[];
-}
-
-declare var CryptoKey: {
-    prototype: CryptoKey;
-    new(): CryptoKey;
-};
-
-interface CryptoKeyPair {
-    privateKey: CryptoKey;
-    publicKey: CryptoKey;
-}
-
-declare var CryptoKeyPair: {
-    prototype: CryptoKeyPair;
-    new(): CryptoKeyPair;
-};
-
-interface CustomElementRegistry {
-    define(name: string, constructor: Function, options?: ElementDefinitionOptions): void;
-    get(name: string): any;
-    whenDefined(name: string): PromiseLike<void>;
-}
-
-interface CustomEvent<T = any> extends Event {
-    readonly detail: T;
-    initCustomEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, detailArg: T): void;
-}
-
-declare var CustomEvent: {
-    prototype: CustomEvent;
-    new<T>(typeArg: string, eventInitDict?: CustomEventInit<T>): CustomEvent<T>;
-};
-
-interface DOMError {
-    readonly name: string;
-    toString(): string;
-}
-
-declare var DOMError: {
-    prototype: DOMError;
-    new(): DOMError;
-};
-
-interface DOMException {
-    readonly code: number;
-    readonly message: string;
-    readonly name: string;
-    toString(): string;
-    readonly ABORT_ERR: number;
-    readonly DATA_CLONE_ERR: number;
-    readonly DOMSTRING_SIZE_ERR: number;
-    readonly HIERARCHY_REQUEST_ERR: number;
-    readonly INDEX_SIZE_ERR: number;
-    readonly INUSE_ATTRIBUTE_ERR: number;
-    readonly INVALID_ACCESS_ERR: number;
-    readonly INVALID_CHARACTER_ERR: number;
-    readonly INVALID_MODIFICATION_ERR: number;
-    readonly INVALID_NODE_TYPE_ERR: number;
-    readonly INVALID_STATE_ERR: number;
-    readonly NAMESPACE_ERR: number;
-    readonly NETWORK_ERR: number;
-    readonly NOT_FOUND_ERR: number;
-    readonly NOT_SUPPORTED_ERR: number;
-    readonly NO_DATA_ALLOWED_ERR: number;
-    readonly NO_MODIFICATION_ALLOWED_ERR: number;
-    readonly PARSE_ERR: number;
-    readonly QUOTA_EXCEEDED_ERR: number;
-    readonly SECURITY_ERR: number;
-    readonly SERIALIZE_ERR: number;
-    readonly SYNTAX_ERR: number;
-    readonly TIMEOUT_ERR: number;
-    readonly TYPE_MISMATCH_ERR: number;
-    readonly URL_MISMATCH_ERR: number;
-    readonly VALIDATION_ERR: number;
-    readonly WRONG_DOCUMENT_ERR: number;
-}
-
-declare var DOMException: {
-    prototype: DOMException;
-    new(message?: string, name?: string): DOMException;
-    readonly ABORT_ERR: number;
-    readonly DATA_CLONE_ERR: number;
-    readonly DOMSTRING_SIZE_ERR: number;
-    readonly HIERARCHY_REQUEST_ERR: number;
-    readonly INDEX_SIZE_ERR: number;
-    readonly INUSE_ATTRIBUTE_ERR: number;
-    readonly INVALID_ACCESS_ERR: number;
-    readonly INVALID_CHARACTER_ERR: number;
-    readonly INVALID_MODIFICATION_ERR: number;
-    readonly INVALID_NODE_TYPE_ERR: number;
-    readonly INVALID_STATE_ERR: number;
-    readonly NAMESPACE_ERR: number;
-    readonly NETWORK_ERR: number;
-    readonly NOT_FOUND_ERR: number;
-    readonly NOT_SUPPORTED_ERR: number;
-    readonly NO_DATA_ALLOWED_ERR: number;
-    readonly NO_MODIFICATION_ALLOWED_ERR: number;
-    readonly PARSE_ERR: number;
-    readonly QUOTA_EXCEEDED_ERR: number;
-    readonly SECURITY_ERR: number;
-    readonly SERIALIZE_ERR: number;
-    readonly SYNTAX_ERR: number;
-    readonly TIMEOUT_ERR: number;
-    readonly TYPE_MISMATCH_ERR: number;
-    readonly URL_MISMATCH_ERR: number;
-    readonly VALIDATION_ERR: number;
-    readonly WRONG_DOCUMENT_ERR: number;
-};
-
-interface DOMImplementation {
-    createDocument(namespaceURI: string | null, qualifiedName: string | null, doctype: DocumentType | null): Document;
-    createDocumentType(qualifiedName: string, publicId: string, systemId: string): DocumentType;
-    createHTMLDocument(title?: string): Document;
-    hasFeature(feature: string | null, version: string | null): boolean;
-}
-
-declare var DOMImplementation: {
-    prototype: DOMImplementation;
-    new(): DOMImplementation;
-};
-
-interface DOML2DeprecatedColorProperty {
-    color: string;
-}
-
-interface DOML2DeprecatedSizeProperty {
-    size: number;
-}
-
-interface DOMParser {
-    parseFromString(source: string, mimeType: string): Document;
-}
-
-declare var DOMParser: {
-    prototype: DOMParser;
-    new(): DOMParser;
-};
-
-interface DOMRect extends DOMRectReadOnly {
-    height: number;
-    width: number;
-    x: number;
-    y: number;
-}
-
-declare var DOMRect: {
-    prototype: DOMRect;
-    new (x?: number, y?: number, width?: number, height?: number): DOMRect;
-    fromRect(rectangle?: DOMRectInit): DOMRect;
-};
-
-interface DOMRectList {
-    readonly length: number;
-    item(index: number): DOMRect | null;
-    [index: number]: DOMRect;
-}
-
-interface DOMRectReadOnly {
-    readonly bottom: number;
-    readonly height: number;
-    readonly left: number;
-    readonly right: number;
-    readonly top: number;
-    readonly width: number;
-    readonly x: number;
-    readonly y: number;
-}
-
-declare var DOMRectReadOnly: {
-    prototype: DOMRectReadOnly;
-    new (x?: number, y?: number, width?: number, height?: number): DOMRectReadOnly;
-    fromRect(rectangle?: DOMRectInit): DOMRectReadOnly;
-};
-
-interface DOMSettableTokenList extends DOMTokenList {
-    value: string;
-}
-
-declare var DOMSettableTokenList: {
-    prototype: DOMSettableTokenList;
-    new(): DOMSettableTokenList;
-};
-
-interface DOMStringList {
-    readonly length: number;
-    contains(str: string): boolean;
-    item(index: number): string | null;
-    [index: number]: string;
-}
-
-declare var DOMStringList: {
-    prototype: DOMStringList;
-    new(): DOMStringList;
-};
-
-interface DOMStringMap {
-    [name: string]: string | undefined;
-}
-
-declare var DOMStringMap: {
-    prototype: DOMStringMap;
-    new(): DOMStringMap;
-};
-
-interface DOMTokenList {
-    readonly length: number;
-    add(...tokens: string[]): void;
-    contains(token: string): boolean;
-    item(index: number): string | null;
-    remove(...tokens: string[]): void;
-    replace(oldToken: string, newToken: string): void;
-    toString(): string;
-    toggle(token: string, force?: boolean): boolean;
-    [index: number]: string;
-}
-
-declare var DOMTokenList: {
-    prototype: DOMTokenList;
-    new(): DOMTokenList;
-};
-
-interface DataCue extends TextTrackCue {
-    data: ArrayBuffer;
-    addEventListener<K extends keyof TextTrackCueEventMap>(type: K, listener: (this: DataCue, ev: TextTrackCueEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof TextTrackCueEventMap>(type: K, listener: (this: DataCue, ev: TextTrackCueEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var DataCue: {
-    prototype: DataCue;
-    new(): DataCue;
-};
-
-interface DataTransfer {
-    dropEffect: string;
-    effectAllowed: string;
-    readonly files: FileList;
-    readonly items: DataTransferItemList;
-    readonly types: string[];
-    clearData(format?: string): boolean;
-    getData(format: string): string;
-    setData(format: string, data: string): boolean;
-    setDragImage(image: Element, x: number, y: number): void;
-}
-
-declare var DataTransfer: {
-    prototype: DataTransfer;
-    new(): DataTransfer;
-};
-
-interface DataTransferItem {
-    readonly kind: string;
-    readonly type: string;
-    getAsFile(): File | null;
-    getAsString(_callback: FunctionStringCallback | null): void;
-    webkitGetAsEntry(): any;
-}
-
-declare var DataTransferItem: {
-    prototype: DataTransferItem;
-    new(): DataTransferItem;
-};
-
-interface DataTransferItemList {
-    readonly length: number;
-    add(data: File): DataTransferItem | null;
-    add(data: string, type: string): DataTransferItem | null;
-    clear(): void;
-    item(index: number): DataTransferItem;
-    remove(index: number): void;
-    [name: number]: DataTransferItem;
-}
-
-declare var DataTransferItemList: {
-    prototype: DataTransferItemList;
-    new(): DataTransferItemList;
-};
-
-interface DeferredPermissionRequest {
-    readonly id: number;
-    readonly type: MSWebViewPermissionType;
-    readonly uri: string;
-    allow(): void;
-    deny(): void;
-}
-
-declare var DeferredPermissionRequest: {
-    prototype: DeferredPermissionRequest;
-    new(): DeferredPermissionRequest;
-};
-
-interface DelayNode extends AudioNode {
-    readonly delayTime: AudioParam;
-}
-
-declare var DelayNode: {
-    prototype: DelayNode;
-    new(): DelayNode;
-};
-
-interface DeviceAcceleration {
-    readonly x: number | null;
-    readonly y: number | null;
-    readonly z: number | null;
-}
-
-declare var DeviceAcceleration: {
-    prototype: DeviceAcceleration;
-    new(): DeviceAcceleration;
-};
-
-interface DeviceLightEvent extends Event {
-    readonly value: number;
-}
-
-declare var DeviceLightEvent: {
-    prototype: DeviceLightEvent;
-    new(typeArg: string, eventInitDict?: DeviceLightEventInit): DeviceLightEvent;
-};
-
-interface DeviceMotionEvent extends Event {
-    readonly acceleration: DeviceAcceleration | null;
-    readonly accelerationIncludingGravity: DeviceAcceleration | null;
-    readonly interval: number | null;
-    readonly rotationRate: DeviceRotationRate | null;
-    initDeviceMotionEvent(type: string, bubbles: boolean, cancelable: boolean, acceleration: DeviceAccelerationDict | null, accelerationIncludingGravity: DeviceAccelerationDict | null, rotationRate: DeviceRotationRateDict | null, interval: number | null): void;
-}
-
-declare var DeviceMotionEvent: {
-    prototype: DeviceMotionEvent;
-    new(typeArg: string, eventInitDict?: DeviceMotionEventInit): DeviceMotionEvent;
-};
-
-interface DeviceOrientationEvent extends Event {
-    readonly absolute: boolean;
-    readonly alpha: number | null;
-    readonly beta: number | null;
-    readonly gamma: number | null;
-    initDeviceOrientationEvent(type: string, bubbles: boolean, cancelable: boolean, alpha: number | null, beta: number | null, gamma: number | null, absolute: boolean): void;
-}
-
-declare var DeviceOrientationEvent: {
-    prototype: DeviceOrientationEvent;
-    new(typeArg: string, eventInitDict?: DeviceOrientationEventInit): DeviceOrientationEvent;
-};
-
-interface DeviceRotationRate {
-    readonly alpha: number | null;
-    readonly beta: number | null;
-    readonly gamma: number | null;
-}
-
-declare var DeviceRotationRate: {
-    prototype: DeviceRotationRate;
-    new(): DeviceRotationRate;
-};
-
-interface DhImportKeyParams extends Algorithm {
-    generator: Uint8Array;
-    prime: Uint8Array;
-}
-
-interface DhKeyAlgorithm extends KeyAlgorithm {
-    generator: Uint8Array;
-    prime: Uint8Array;
-}
-
-interface DhKeyDeriveParams extends Algorithm {
-    public: CryptoKey;
-}
-
-interface DhKeyGenParams extends Algorithm {
-    generator: Uint8Array;
-    prime: Uint8Array;
-}
-
-interface DocumentEventMap extends GlobalEventHandlersEventMap {
-    "abort": UIEvent;
-    "activate": Event;
-    "beforeactivate": Event;
-    "beforedeactivate": Event;
-    "blur": FocusEvent;
-    "canplay": Event;
-    "canplaythrough": Event;
-    "change": Event;
-    "click": MouseEvent;
-    "contextmenu": PointerEvent;
-    "dblclick": MouseEvent;
-    "deactivate": Event;
-    "drag": DragEvent;
-    "dragend": DragEvent;
-    "dragenter": DragEvent;
-    "dragleave": DragEvent;
-    "dragover": DragEvent;
-    "dragstart": DragEvent;
-    "drop": DragEvent;
-    "durationchange": Event;
-    "emptied": Event;
-    "ended": Event;
-    "error": ErrorEvent;
-    "focus": FocusEvent;
-    "fullscreenchange": Event;
-    "fullscreenerror": Event;
-    "input": Event;
-    "invalid": Event;
-    "keydown": KeyboardEvent;
-    "keypress": KeyboardEvent;
-    "keyup": KeyboardEvent;
-    "load": Event;
-    "loadeddata": Event;
-    "loadedmetadata": Event;
-    "loadstart": Event;
-    "mousedown": MouseEvent;
-    "mousemove": MouseEvent;
-    "mouseout": MouseEvent;
-    "mouseover": MouseEvent;
-    "mouseup": MouseEvent;
-    "mousewheel": WheelEvent;
-    "MSContentZoom": Event;
-    "MSGestureChange": Event;
-    "MSGestureDoubleTap": Event;
-    "MSGestureEnd": Event;
-    "MSGestureHold": Event;
-    "MSGestureStart": Event;
-    "MSGestureTap": Event;
-    "MSInertiaStart": Event;
-    "MSManipulationStateChanged": Event;
-    "MSPointerCancel": Event;
-    "MSPointerDown": Event;
-    "MSPointerEnter": Event;
-    "MSPointerLeave": Event;
-    "MSPointerMove": Event;
-    "MSPointerOut": Event;
-    "MSPointerOver": Event;
-    "MSPointerUp": Event;
-    "mssitemodejumplistitemremoved": Event;
-    "msthumbnailclick": Event;
-    "pause": Event;
-    "play": Event;
-    "playing": Event;
-    "pointerlockchange": Event;
-    "pointerlockerror": Event;
-    "progress": ProgressEvent;
-    "ratechange": Event;
-    "readystatechange": Event;
-    "reset": Event;
-    "scroll": UIEvent;
-    "seeked": Event;
-    "seeking": Event;
-    "select": UIEvent;
-    "selectionchange": Event;
-    "selectstart": Event;
-    "stalled": Event;
-    "stop": Event;
-    "submit": Event;
-    "suspend": Event;
-    "timeupdate": Event;
-    "touchcancel": TouchEvent;
-    "touchend": TouchEvent;
-    "touchmove": TouchEvent;
-    "touchstart": TouchEvent;
-    "volumechange": Event;
-    "waiting": Event;
-    "webkitfullscreenchange": Event;
-    "webkitfullscreenerror": Event;
-}
-
-interface Document extends Node, GlobalEventHandlers, ParentNode, DocumentEvent {
-    /**
-     * Sets or gets the URL for the current document.
-     */
-    readonly URL: string;
-    /**
-     * Gets the URL for the document, stripped of any character encoding.
-     */
-    readonly URLUnencoded: string;
-    /**
-     * Gets the object that has the focus when the parent document has focus.
-     */
-    readonly activeElement: Element;
-    /**
-     * Sets or gets the color of all active links in the document.
-     */
-    alinkColor: string;
-    /**
-     * Returns a reference to the collection of elements contained by the object.
-     */
-    readonly all: HTMLAllCollection;
-    /**
-     * Retrieves a collection of all a objects that have a name and/or id property. Objects in this collection are in HTML source order.
-     */
-    readonly anchors: HTMLCollectionOf<HTMLAnchorElement>;
-    /**
-     * Retrieves a collection of all applet objects in the document.
-     */
-    readonly applets: HTMLCollectionOf<HTMLAppletElement>;
-    /**
-     * Deprecated. Sets or retrieves a value that indicates the background color behind the object.
-     */
-    bgColor: string;
-    /**
-     * Specifies the beginning and end of the document body.
-     */
-    body: HTMLElement;
-    readonly characterSet: string;
-    /**
-     * Gets or sets the character set used to encode the object.
-     */
-    charset: string;
-    /**
-     * Gets a value that indicates whether standards-compliant mode is switched on for the object.
-     */
-    readonly compatMode: string;
-    cookie: string;
-    readonly currentScript: HTMLScriptElement | SVGScriptElement | null;
-    readonly defaultView: Window;
-    /**
-     * Sets or gets a value that indicates whether the document can be edited.
-     */
-    designMode: string;
-    /**
-     * Sets or retrieves a value that indicates the reading order of the object.
-     */
-    dir: string;
-    /**
-     * Gets an object representing the document type declaration associated with the current document.
-     */
-    readonly doctype: DocumentType;
-    /**
-     * Gets a reference to the root node of the document.
-     */
-    readonly documentElement: HTMLElement;
-    /**
-     * Sets or gets the security domain of the document.
-     */
-    domain: string;
-    /**
-     * Retrieves a collection of all embed objects in the document.
-     */
-    readonly embeds: HTMLCollectionOf<HTMLEmbedElement>;
-    /**
-     * Sets or gets the foreground (text) color of the document.
-     */
-    fgColor: string;
-    /**
-     * Retrieves a collection, in source order, of all form objects in the document.
-     */
-    readonly forms: HTMLCollectionOf<HTMLFormElement>;
-    readonly fullscreenElement: Element | null;
-    readonly fullscreenEnabled: boolean;
-    readonly head: HTMLHeadElement;
-    readonly hidden: boolean;
-    /**
-     * Retrieves a collection, in source order, of img objects in the document.
-     */
-    readonly images: HTMLCollectionOf<HTMLImageElement>;
-    /**
-     * Gets the implementation object of the current document.
-     */
-    readonly implementation: DOMImplementation;
-    /**
-     * Returns the character encoding used to create the webpage that is loaded into the document object.
-     */
-    readonly inputEncoding: string | null;
-    /**
-     * Gets the date that the page was last modified, if the page supplies one.
-     */
-    readonly lastModified: string;
-    /**
-     * Sets or gets the color of the document links.
-     */
-    linkColor: string;
-    /**
-     * Retrieves a collection of all a objects that specify the href property and all area objects in the document.
-     */
-    readonly links: HTMLCollectionOf<HTMLAnchorElement | HTMLAreaElement>;
-    /**
-     * Contains information about the current URL.
-     */
-    location: Location;
-    msCSSOMElementFloatMetrics: boolean;
-    msCapsLockWarningOff: boolean;
-    /**
-     * Fires when the user aborts the download.
-     * @param ev The event.
-     */
-    onabort: ((this: Document, ev: UIEvent) => any) | null;
-    /**
-     * Fires when the object is set as the active element.
-     * @param ev The event.
-     */
-    onactivate: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires immediately before the object is set as the active element.
-     * @param ev The event.
-     */
-    onbeforeactivate: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires immediately before the activeElement is changed from the current object to another object in the parent document.
-     * @param ev The event.
-     */
-    onbeforedeactivate: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the object loses the input focus.
-     * @param ev The focus event.
-     */
-    onblur: ((this: Document, ev: FocusEvent) => any) | null;
-    /**
-     * Occurs when playback is possible, but would require further buffering.
-     * @param ev The event.
-     */
-    oncanplay: ((this: Document, ev: Event) => any) | null;
-    oncanplaythrough: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the contents of the object or selection have changed.
-     * @param ev The event.
-     */
-    onchange: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the user clicks the left mouse button on the object
-     * @param ev The mouse event.
-     */
-    onclick: ((this: Document, ev: MouseEvent) => any) | null;
-    /**
-     * Fires when the user clicks the right mouse button in the client area, opening the context menu.
-     * @param ev The mouse event.
-     */
-    oncontextmenu: ((this: Document, ev: PointerEvent) => any) | null;
-    /**
-     * Fires when the user double-clicks the object.
-     * @param ev The mouse event.
-     */
-    ondblclick: ((this: Document, ev: MouseEvent) => any) | null;
-    /**
-     * Fires when the activeElement is changed from the current object to another object in the parent document.
-     * @param ev The UI Event
-     */
-    ondeactivate: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires on the source object continuously during a drag operation.
-     * @param ev The event.
-     */
-    ondrag: ((this: Document, ev: DragEvent) => any) | null;
-    /**
-     * Fires on the source object when the user releases the mouse at the close of a drag operation.
-     * @param ev The event.
-     */
-    ondragend: ((this: Document, ev: DragEvent) => any) | null;
-    /**
-     * Fires on the target element when the user drags the object to a valid drop target.
-     * @param ev The drag event.
-     */
-    ondragenter: ((this: Document, ev: DragEvent) => any) | null;
-    /**
-     * Fires on the target object when the user moves the mouse out of a valid drop target during a drag operation.
-     * @param ev The drag event.
-     */
-    ondragleave: ((this: Document, ev: DragEvent) => any) | null;
-    /**
-     * Fires on the target element continuously while the user drags the object over a valid drop target.
-     * @param ev The event.
-     */
-    ondragover: ((this: Document, ev: DragEvent) => any) | null;
-    /**
-     * Fires on the source object when the user starts to drag a text selection or selected object.
-     * @param ev The event.
-     */
-    ondragstart: ((this: Document, ev: DragEvent) => any) | null;
-    ondrop: ((this: Document, ev: DragEvent) => any) | null;
-    /**
-     * Occurs when the duration attribute is updated.
-     * @param ev The event.
-     */
-    ondurationchange: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when the media element is reset to its initial state.
-     * @param ev The event.
-     */
-    onemptied: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when the end of playback is reached.
-     * @param ev The event
-     */
-    onended: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when an error occurs during object loading.
-     * @param ev The event.
-     */
-    onerror: ((this: Document, ev: ErrorEvent) => any) | null;
-    /**
-     * Fires when the object receives focus.
-     * @param ev The event.
-     */
-    onfocus: ((this: Document, ev: FocusEvent) => any) | null;
-    onfullscreenchange: ((this: Document, ev: Event) => any) | null;
-    onfullscreenerror: ((this: Document, ev: Event) => any) | null;
-    oninput: ((this: Document, ev: Event) => any) | null;
-    oninvalid: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the user presses a key.
-     * @param ev The keyboard event
-     */
-    onkeydown: ((this: Document, ev: KeyboardEvent) => any) | null;
-    /**
-     * Fires when the user presses an alphanumeric key.
-     * @param ev The event.
-     */
-    onkeypress: ((this: Document, ev: KeyboardEvent) => any) | null;
-    /**
-     * Fires when the user releases a key.
-     * @param ev The keyboard event
-     */
-    onkeyup: ((this: Document, ev: KeyboardEvent) => any) | null;
-    /**
-     * Fires immediately after the browser loads the object.
-     * @param ev The event.
-     */
-    onload: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when media data is loaded at the current playback position.
-     * @param ev The event.
-     */
-    onloadeddata: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when the duration and dimensions of the media have been determined.
-     * @param ev The event.
-     */
-    onloadedmetadata: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when Internet Explorer begins looking for media data.
-     * @param ev The event.
-     */
-    onloadstart: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the user clicks the object with either mouse button.
-     * @param ev The mouse event.
-     */
-    onmousedown: ((this: Document, ev: MouseEvent) => any) | null;
-    /**
-     * Fires when the user moves the mouse over the object.
-     * @param ev The mouse event.
-     */
-    onmousemove: ((this: Document, ev: MouseEvent) => any) | null;
-    /**
-     * Fires when the user moves the mouse pointer outside the boundaries of the object.
-     * @param ev The mouse event.
-     */
-    onmouseout: ((this: Document, ev: MouseEvent) => any) | null;
-    /**
-     * Fires when the user moves the mouse pointer into the object.
-     * @param ev The mouse event.
-     */
-    onmouseover: ((this: Document, ev: MouseEvent) => any) | null;
-    /**
-     * Fires when the user releases a mouse button while the mouse is over the object.
-     * @param ev The mouse event.
-     */
-    onmouseup: ((this: Document, ev: MouseEvent) => any) | null;
-    /**
-     * Fires when the wheel button is rotated.
-     * @param ev The mouse event
-     */
-    onmousewheel: ((this: Document, ev: WheelEvent) => any) | null;
-    onmscontentzoom: ((this: Document, ev: Event) => any) | null;
-    onmsgesturechange: ((this: Document, ev: Event) => any) | null;
-    onmsgesturedoubletap: ((this: Document, ev: Event) => any) | null;
-    onmsgestureend: ((this: Document, ev: Event) => any) | null;
-    onmsgesturehold: ((this: Document, ev: Event) => any) | null;
-    onmsgesturestart: ((this: Document, ev: Event) => any) | null;
-    onmsgesturetap: ((this: Document, ev: Event) => any) | null;
-    onmsinertiastart: ((this: Document, ev: Event) => any) | null;
-    onmsmanipulationstatechanged: ((this: Document, ev: Event) => any) | null;
-    onmspointercancel: ((this: Document, ev: Event) => any) | null;
-    onmspointerdown: ((this: Document, ev: Event) => any) | null;
-    onmspointerenter: ((this: Document, ev: Event) => any) | null;
-    onmspointerleave: ((this: Document, ev: Event) => any) | null;
-    onmspointermove: ((this: Document, ev: Event) => any) | null;
-    onmspointerout: ((this: Document, ev: Event) => any) | null;
-    onmspointerover: ((this: Document, ev: Event) => any) | null;
-    onmspointerup: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when an item is removed from a Jump List of a webpage running in Site Mode.
-     * @param ev The event.
-     */
-    onmssitemodejumplistitemremoved: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when a user clicks a button in a Thumbnail Toolbar of a webpage running in Site Mode.
-     * @param ev The event.
-     */
-    onmsthumbnailclick: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when playback is paused.
-     * @param ev The event.
-     */
-    onpause: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when the play method is requested.
-     * @param ev The event.
-     */
-    onplay: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when the audio or video has started playing.
-     * @param ev The event.
-     */
-    onplaying: ((this: Document, ev: Event) => any) | null;
-    onpointerlockchange: ((this: Document, ev: Event) => any) | null;
-    onpointerlockerror: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs to indicate progress while downloading media data.
-     * @param ev The event.
-     */
-    onprogress: ((this: Document, ev: ProgressEvent) => any) | null;
-    /**
-     * Occurs when the playback rate is increased or decreased.
-     * @param ev The event.
-     */
-    onratechange: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the state of the object has changed.
-     * @param ev The event
-     */
-    onreadystatechange: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the user resets a form.
-     * @param ev The event.
-     */
-    onreset: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the user repositions the scroll box in the scroll bar on the object.
-     * @param ev The event.
-     */
-    onscroll: ((this: Document, ev: UIEvent) => any) | null;
-    /**
-     * Occurs when the seek operation ends.
-     * @param ev The event.
-     */
-    onseeked: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when the current playback position is moved.
-     * @param ev The event.
-     */
-    onseeking: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the current selection changes.
-     * @param ev The event.
-     */
-    onselect: ((this: Document, ev: UIEvent) => any) | null;
-    /**
-     * Fires when the selection state of a document changes.
-     * @param ev The event.
-     */
-    onselectionchange: ((this: Document, ev: Event) => any) | null;
-    onselectstart: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when the download has stopped.
-     * @param ev The event.
-     */
-    onstalled: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the user clicks the Stop button or leaves the Web page.
-     * @param ev The event.
-     */
-    onstop: ((this: Document, ev: Event) => any) | null;
-    onsubmit: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs if the load operation has been intentionally halted.
-     * @param ev The event.
-     */
-    onsuspend: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs to indicate the current playback position.
-     * @param ev The event.
-     */
-    ontimeupdate: ((this: Document, ev: Event) => any) | null;
-    ontouchcancel: ((this: Document, ev: TouchEvent) => any) | null;
-    ontouchend: ((this: Document, ev: TouchEvent) => any) | null;
-    ontouchmove: ((this: Document, ev: TouchEvent) => any) | null;
-    ontouchstart: ((this: Document, ev: TouchEvent) => any) | null;
-    onvisibilitychange: (this: Document, ev: Event) => any;
-    /**
-     * Occurs when the volume is changed, or playback is muted or unmuted.
-     * @param ev The event.
-     */
-    onvolumechange: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when playback stops because the next frame of a video resource is not available.
-     * @param ev The event.
-     */
-    onwaiting: ((this: Document, ev: Event) => any) | null;
-    onwebkitfullscreenchange: ((this: Document, ev: Event) => any) | null;
-    onwebkitfullscreenerror: ((this: Document, ev: Event) => any) | null;
-    readonly plugins: HTMLCollectionOf<HTMLEmbedElement>;
-    readonly pointerLockElement: Element;
-    /**
-     * Retrieves a value that indicates the current state of the object.
-     */
-    readonly readyState: DocumentReadyState;
-    /**
-     * Gets the URL of the location that referred the user to the current page.
-     */
-    readonly referrer: string;
-    /**
-     * Gets the root svg element in the document hierarchy.
-     */
-    readonly rootElement: SVGSVGElement;
-    /**
-     * Retrieves a collection of all script objects in the document.
-     */
-    readonly scripts: HTMLCollectionOf<HTMLScriptElement>;
-    readonly scrollingElement: Element | null;
-    /**
-     * Retrieves a collection of styleSheet objects representing the style sheets that correspond to each instance of a link or style object in the document.
-     */
-    readonly styleSheets: StyleSheetList;
-    /**
-     * Contains the title of the document.
-     */
-    title: string;
-    readonly visibilityState: VisibilityState;
-    /**
-     * Sets or gets the color of the links that the user has visited.
-     */
-    vlinkColor: string;
-    readonly webkitCurrentFullScreenElement: Element | null;
-    readonly webkitFullscreenElement: Element | null;
-    readonly webkitFullscreenEnabled: boolean;
-    readonly webkitIsFullScreen: boolean;
-    readonly xmlEncoding: string | null;
-    xmlStandalone: boolean;
-    /**
-     * Gets or sets the version attribute specified in the declaration of an XML document.
-     */
-    xmlVersion: string | null;
-    adoptNode<T extends Node>(source: T): T;
-    captureEvents(): void;
-    caretRangeFromPoint(x: number, y: number): Range;
-    clear(): void;
-    /**
-     * Closes an output stream and forces the sent data to display.
-     */
-    close(): void;
-    /**
-     * Creates an attribute object with a specified name.
-     * @param name String that sets the attribute object's name.
-     */
-    createAttribute(name: string): Attr;
-    createAttributeNS(namespaceURI: string | null, qualifiedName: string): Attr;
-    createCDATASection(data: string): CDATASection;
-    /**
-     * Creates a comment object with the specified data.
-     * @param data Sets the comment object's data.
-     */
-    createComment(data: string): Comment;
-    /**
-     * Creates a new document.
-     */
-    createDocumentFragment(): DocumentFragment;
-    /**
-     * Creates an instance of the element for the specified tag.
-     * @param tagName The name of an element.
-     */
-    createElement<K extends keyof HTMLElementTagNameMap>(tagName: K, options?: ElementCreationOptions): HTMLElementTagNameMap[K];
-    createElement(tagName: string, options?: ElementCreationOptions): HTMLElement;
-    createElementNS(namespaceURI: "http://www.w3.org/1999/xhtml", qualifiedName: string): HTMLElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "a"): SVGAElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "circle"): SVGCircleElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "clipPath"): SVGClipPathElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "componentTransferFunction"): SVGComponentTransferFunctionElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "defs"): SVGDefsElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "desc"): SVGDescElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "ellipse"): SVGEllipseElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feBlend"): SVGFEBlendElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feColorMatrix"): SVGFEColorMatrixElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feComponentTransfer"): SVGFEComponentTransferElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feComposite"): SVGFECompositeElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feConvolveMatrix"): SVGFEConvolveMatrixElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feDiffuseLighting"): SVGFEDiffuseLightingElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feDisplacementMap"): SVGFEDisplacementMapElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feDistantLight"): SVGFEDistantLightElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feFlood"): SVGFEFloodElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feFuncA"): SVGFEFuncAElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feFuncB"): SVGFEFuncBElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feFuncG"): SVGFEFuncGElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feFuncR"): SVGFEFuncRElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feGaussianBlur"): SVGFEGaussianBlurElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feImage"): SVGFEImageElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feMerge"): SVGFEMergeElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feMergeNode"): SVGFEMergeNodeElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feMorphology"): SVGFEMorphologyElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feOffset"): SVGFEOffsetElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "fePointLight"): SVGFEPointLightElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feSpecularLighting"): SVGFESpecularLightingElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feSpotLight"): SVGFESpotLightElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feTile"): SVGFETileElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feTurbulence"): SVGFETurbulenceElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "filter"): SVGFilterElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "foreignObject"): SVGForeignObjectElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "g"): SVGGElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "image"): SVGImageElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "gradient"): SVGGradientElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "line"): SVGLineElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "linearGradient"): SVGLinearGradientElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "marker"): SVGMarkerElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "mask"): SVGMaskElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "path"): SVGPathElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "metadata"): SVGMetadataElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "pattern"): SVGPatternElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "polygon"): SVGPolygonElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "polyline"): SVGPolylineElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "radialGradient"): SVGRadialGradientElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "rect"): SVGRectElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "svg"): SVGSVGElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "script"): SVGScriptElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "stop"): SVGStopElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "style"): SVGStyleElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "switch"): SVGSwitchElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "symbol"): SVGSymbolElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "tspan"): SVGTSpanElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "textContent"): SVGTextContentElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "text"): SVGTextElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "textPath"): SVGTextPathElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "textPositioning"): SVGTextPositioningElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "title"): SVGTitleElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "use"): SVGUseElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "view"): SVGViewElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: string): SVGElement;
-    createElementNS(namespaceURI: string | null, qualifiedName: string): Element;
-    createExpression(expression: string, resolver: XPathNSResolver): XPathExpression;
-    createNSResolver(nodeResolver: Node): XPathNSResolver;
-    /**
-     * Creates a NodeIterator object that you can use to traverse filtered lists of nodes or elements in a document.
-     * @param root The root element or node to start traversing on.
-     * @param whatToShow The type of nodes or elements to appear in the node list
-     * @param filter A custom NodeFilter function to use. For more information, see filter. Use null for no filter.
-     * @param entityReferenceExpansion A flag that specifies whether entity reference nodes are expanded.
-     */
-    createNodeIterator(root: Node, whatToShow?: number, filter?: NodeFilter, entityReferenceExpansion?: boolean): NodeIterator;
-    createProcessingInstruction(target: string, data: string): ProcessingInstruction;
-    /**
-     *  Returns an empty range object that has both of its boundary points positioned at the beginning of the document.
-     */
-    createRange(): Range;
-    /**
-     * Creates a text string from the specified value.
-     * @param data String that specifies the nodeValue property of the text node.
-     */
-    createTextNode(data: string): Text;
-    createTouch(view: Window, target: EventTarget, identifier: number, pageX: number, pageY: number, screenX: number, screenY: number): Touch;
-    createTouchList(...touches: Touch[]): TouchList;
-    /**
-     * Creates a TreeWalker object that you can use to traverse filtered lists of nodes or elements in a document.
-     * @param root The root element or node to start traversing on.
-     * @param whatToShow The type of nodes or elements to appear in the node list. For more information, see whatToShow.
-     * @param filter A custom NodeFilter function to use.
-     * @param entityReferenceExpansion A flag that specifies whether entity reference nodes are expanded.
-     */
-    createTreeWalker(root: Node, whatToShow?: number, filter?: NodeFilter, entityReferenceExpansion?: boolean): TreeWalker;
-    /**
-     * Returns the element for the specified x coordinate and the specified y coordinate.
-     * @param x The x-offset
-     * @param y The y-offset
-     */
-    elementFromPoint(x: number, y: number): Element;
-    elementsFromPoint(x: number, y: number): Element[];
-    evaluate(expression: string, contextNode: Node, resolver: XPathNSResolver | null, type: number, result: XPathResult | null): XPathResult;
-    /**
-     * Executes a command on the current document, current selection, or the given range.
-     * @param commandId String that specifies the command to execute. This command can be any of the command identifiers that can be executed in script.
-     * @param showUI Display the user interface, defaults to false.
-     * @param value Value to assign.
-     */
-    execCommand(commandId: string, showUI?: boolean, value?: any): boolean;
-    /**
-     * Displays help information for the given command identifier.
-     * @param commandId Displays help information for the given command identifier.
-     */
-    execCommandShowHelp(commandId: string): boolean;
-    exitFullscreen(): void;
-    exitPointerLock(): void;
-    /**
-     * Causes the element to receive the focus and executes the code specified by the onfocus event.
-     */
-    /** @deprecated */
-    focus(): void;
-    /**
-     * Returns a reference to the first object with the specified value of the ID or NAME attribute.
-     * @param elementId String that specifies the ID value. Case-insensitive.
-     */
-    getElementById(elementId: string): HTMLElement | null;
-    getElementsByClassName(classNames: string): HTMLCollectionOf<Element>;
-    /**
-     * Gets a collection of objects based on the value of the NAME or ID attribute.
-     * @param elementName Gets a collection of objects based on the value of the NAME or ID attribute.
-     */
-    getElementsByName(elementName: string): NodeListOf<HTMLElement>;
-    /**
-     * Retrieves a collection of objects based on the specified element name.
-     * @param name Specifies the name of an element.
-     */
-    getElementsByTagName<K extends keyof HTMLElementTagNameMap>(tagname: K): NodeListOf<HTMLElementTagNameMap[K]>;
-    getElementsByTagName<K extends keyof SVGElementTagNameMap>(tagname: K): NodeListOf<SVGElementTagNameMap[K]>;
-    getElementsByTagName(tagname: string): NodeListOf<Element>;
-    getElementsByTagNameNS(namespaceURI: "http://www.w3.org/1999/xhtml", localName: string): HTMLCollectionOf<HTMLElement>;
-    getElementsByTagNameNS(namespaceURI: "http://www.w3.org/2000/svg", localName: string): HTMLCollectionOf<SVGElement>;
-    getElementsByTagNameNS(namespaceURI: string, localName: string): HTMLCollectionOf<Element>;
-    /**
-     * Returns an object representing the current selection of the document that is loaded into the object displaying a webpage.
-     */
-    getSelection(): Selection;
-    /**
-     * Gets a value indicating whether the object currently has focus.
-     */
-    hasFocus(): boolean;
-    importNode<T extends Node>(importedNode: T, deep: boolean): T;
-    msElementsFromPoint(x: number, y: number): NodeListOf<Element>;
-    msElementsFromRect(left: number, top: number, width: number, height: number): NodeListOf<Element>;
-    /**
-     * Opens a new window and loads a document specified by a given URL. Also, opens a new window that uses the url parameter and the name parameter to collect the output of the write method and the writeln method.
-     * @param url Specifies a MIME type for the document.
-     * @param name Specifies the name of the window. This name is used as the value for the TARGET attribute on a form or an anchor element.
-     * @param features Contains a list of items separated by commas. Each item consists of an option and a value, separated by an equals sign (for example, "fullscreen=yes, toolbar=yes"). The following values are supported.
-     * @param replace Specifies whether the existing entry for the document is replaced in the history list.
-     */
-    open(url?: string, name?: string, features?: string, replace?: boolean): Document;
-    /**
-     * Returns a Boolean value that indicates whether a specified command can be successfully executed using execCommand, given the current state of the document.
-     * @param commandId Specifies a command identifier.
-     */
-    queryCommandEnabled(commandId: string): boolean;
-    /**
-     * Returns a Boolean value that indicates whether the specified command is in the indeterminate state.
-     * @param commandId String that specifies a command identifier.
-     */
-    queryCommandIndeterm(commandId: string): boolean;
-    /**
-     * Returns a Boolean value that indicates the current state of the command.
-     * @param commandId String that specifies a command identifier.
-     */
-    queryCommandState(commandId: string): boolean;
-    /**
-     * Returns a Boolean value that indicates whether the current command is supported on the current range.
-     * @param commandId Specifies a command identifier.
-     */
-    queryCommandSupported(commandId: string): boolean;
-    /**
-     * Retrieves the string associated with a command.
-     * @param commandId String that contains the identifier of a command. This can be any command identifier given in the list of Command Identifiers.
-     */
-    queryCommandText(commandId: string): string;
-    /**
-     * Returns the current value of the document, range, or current selection for the given command.
-     * @param commandId String that specifies a command identifier.
-     */
-    queryCommandValue(commandId: string): string;
-    releaseEvents(): void;
-    updateSettings(): void;
-    webkitCancelFullScreen(): void;
-    webkitExitFullscreen(): void;
-    /**
-     * Writes one or more HTML expressions to a document in the specified window.
-     * @param content Specifies the text and HTML tags to write.
-     */
-    write(...content: string[]): void;
-    /**
-     * Writes one or more HTML expressions, followed by a carriage return, to a document in the specified window.
-     * @param content The text and HTML tags to write.
-     */
-    writeln(...content: string[]): void;
-    addEventListener<K extends keyof DocumentEventMap>(type: K, listener: (this: Document, ev: DocumentEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof DocumentEventMap>(type: K, listener: (this: Document, ev: DocumentEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var Document: {
-    prototype: Document;
-    new(): Document;
-};
-
-interface DocumentEvent {
-    createEvent(eventInterface: "AnimationEvent"): AnimationEvent;
-    createEvent(eventInterface: "AnimationPlaybackEvent"): AnimationPlaybackEvent;
-    createEvent(eventInterface: "AudioProcessingEvent"): AudioProcessingEvent;
-    createEvent(eventInterface: "BeforeUnloadEvent"): BeforeUnloadEvent;
-    createEvent(eventInterface: "ClipboardEvent"): ClipboardEvent;
-    createEvent(eventInterface: "CloseEvent"): CloseEvent;
-    createEvent(eventInterface: "CompositionEvent"): CompositionEvent;
-    createEvent(eventInterface: "CustomEvent"): CustomEvent;
-    createEvent(eventInterface: "DeviceLightEvent"): DeviceLightEvent;
-    createEvent(eventInterface: "DeviceMotionEvent"): DeviceMotionEvent;
-    createEvent(eventInterface: "DeviceOrientationEvent"): DeviceOrientationEvent;
-    createEvent(eventInterface: "DragEvent"): DragEvent;
-    createEvent(eventInterface: "ErrorEvent"): ErrorEvent;
-    createEvent(eventInterface: "Event"): Event;
-    createEvent(eventInterface: "Events"): Event;
-    createEvent(eventInterface: "FocusEvent"): FocusEvent;
-    createEvent(eventInterface: "FocusNavigationEvent"): FocusNavigationEvent;
-    createEvent(eventInterface: "GamepadEvent"): GamepadEvent;
-    createEvent(eventInterface: "HashChangeEvent"): HashChangeEvent;
-    createEvent(eventInterface: "IDBVersionChangeEvent"): IDBVersionChangeEvent;
-    createEvent(eventInterface: "KeyboardEvent"): KeyboardEvent;
-    createEvent(eventInterface: "ListeningStateChangedEvent"): ListeningStateChangedEvent;
-    createEvent(eventInterface: "MSDCCEvent"): MSDCCEvent;
-    createEvent(eventInterface: "MSDSHEvent"): MSDSHEvent;
-    createEvent(eventInterface: "MSMediaKeyMessageEvent"): MSMediaKeyMessageEvent;
-    createEvent(eventInterface: "MSMediaKeyNeededEvent"): MSMediaKeyNeededEvent;
-    createEvent(eventInterface: "MediaEncryptedEvent"): MediaEncryptedEvent;
-    createEvent(eventInterface: "MediaKeyMessageEvent"): MediaKeyMessageEvent;
-    createEvent(eventInterface: "MediaStreamErrorEvent"): MediaStreamErrorEvent;
-    createEvent(eventInterface: "MediaStreamEvent"): MediaStreamEvent;
-    createEvent(eventInterface: "MediaStreamTrackEvent"): MediaStreamTrackEvent;
-    createEvent(eventInterface: "MessageEvent"): MessageEvent;
-    createEvent(eventInterface: "MouseEvent"): MouseEvent;
-    createEvent(eventInterface: "MouseEvents"): MouseEvent;
-    createEvent(eventInterface: "MutationEvent"): MutationEvent;
-    createEvent(eventInterface: "MutationEvents"): MutationEvent;
-    createEvent(eventInterface: "OfflineAudioCompletionEvent"): OfflineAudioCompletionEvent;
-    createEvent(eventInterface: "OverflowEvent"): OverflowEvent;
-    createEvent(eventInterface: "PageTransitionEvent"): PageTransitionEvent;
-    createEvent(eventInterface: "PaymentRequestUpdateEvent"): PaymentRequestUpdateEvent;
-    createEvent(eventInterface: "PermissionRequestedEvent"): PermissionRequestedEvent;
-    createEvent(eventInterface: "PointerEvent"): PointerEvent;
-    createEvent(eventInterface: "PopStateEvent"): PopStateEvent;
-    createEvent(eventInterface: "ProgressEvent"): ProgressEvent;
-    createEvent(eventInterface: "PromiseRejectionEvent"): PromiseRejectionEvent;
-    createEvent(eventInterface: "RTCDTMFToneChangeEvent"): RTCDTMFToneChangeEvent;
-    createEvent(eventInterface: "RTCDtlsTransportStateChangedEvent"): RTCDtlsTransportStateChangedEvent;
-    createEvent(eventInterface: "RTCIceCandidatePairChangedEvent"): RTCIceCandidatePairChangedEvent;
-    createEvent(eventInterface: "RTCIceGathererEvent"): RTCIceGathererEvent;
-    createEvent(eventInterface: "RTCIceTransportStateChangedEvent"): RTCIceTransportStateChangedEvent;
-    createEvent(eventInterface: "RTCPeerConnectionIceEvent"): RTCPeerConnectionIceEvent;
-    createEvent(eventInterface: "RTCSsrcConflictEvent"): RTCSsrcConflictEvent;
-    createEvent(eventInterface: "SVGZoomEvent"): SVGZoomEvent;
-    createEvent(eventInterface: "SVGZoomEvents"): SVGZoomEvent;
-    createEvent(eventInterface: "SecurityPolicyViolationEvent"): SecurityPolicyViolationEvent;
-    createEvent(eventInterface: "ServiceWorkerMessageEvent"): ServiceWorkerMessageEvent;
-    createEvent(eventInterface: "SpeechSynthesisEvent"): SpeechSynthesisEvent;
-    createEvent(eventInterface: "StorageEvent"): StorageEvent;
-    createEvent(eventInterface: "TextEvent"): TextEvent;
-    createEvent(eventInterface: "TouchEvent"): TouchEvent;
-    createEvent(eventInterface: "TrackEvent"): TrackEvent;
-    createEvent(eventInterface: "TransitionEvent"): TransitionEvent;
-    createEvent(eventInterface: "UIEvent"): UIEvent;
-    createEvent(eventInterface: "UIEvents"): UIEvent;
-    createEvent(eventInterface: "VRDisplayEvent"): VRDisplayEvent;
-    createEvent(eventInterface: "VRDisplayEvent "): VRDisplayEvent ;
-    createEvent(eventInterface: "WebGLContextEvent"): WebGLContextEvent;
-    createEvent(eventInterface: "WheelEvent"): WheelEvent;
-    createEvent(eventInterface: string): Event;
-}
-
-interface DocumentFragment extends Node, ParentNode {
-    getElementById(elementId: string): HTMLElement | null;
-}
-
-declare var DocumentFragment: {
-    prototype: DocumentFragment;
-    new(): DocumentFragment;
-};
-
-interface DocumentOrShadowRoot {
-    readonly activeElement: Element | null;
-    readonly styleSheets: StyleSheetList;
-    elementFromPoint(x: number, y: number): Element | null;
-    elementsFromPoint(x: number, y: number): Element[];
-    getSelection(): Selection | null;
-}
-
-interface DocumentType extends Node, ChildNode {
-    readonly entities: NamedNodeMap;
-    readonly internalSubset: string | null;
-    readonly name: string;
-    readonly notations: NamedNodeMap;
-    readonly publicId: string;
-    readonly systemId: string;
-}
-
-declare var DocumentType: {
-    prototype: DocumentType;
-    new(): DocumentType;
-};
-
-interface DragEvent extends MouseEvent {
-    readonly dataTransfer: DataTransfer;
-    initDragEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number, screenXArg: number, screenYArg: number, clientXArg: number, clientYArg: number, ctrlKeyArg: boolean, altKeyArg: boolean, shiftKeyArg: boolean, metaKeyArg: boolean, buttonArg: number, relatedTargetArg: EventTarget, dataTransferArg: DataTransfer): void;
-    msConvertURL(file: File, targetType: string, targetURL?: string): void;
-}
-
-declare var DragEvent: {
-    prototype: DragEvent;
-    new(type: "drag" | "dragend" | "dragenter" | "dragexit" | "dragleave" | "dragover" | "dragstart" | "drop", dragEventInit?: { dataTransfer?: DataTransfer }): DragEvent;
-};
-
-interface DynamicsCompressorNode extends AudioNode {
-    readonly attack: AudioParam;
-    readonly knee: AudioParam;
-    readonly ratio: AudioParam;
-    readonly reduction: number;
-    readonly release: AudioParam;
-    readonly threshold: AudioParam;
-}
-
-declare var DynamicsCompressorNode: {
-    prototype: DynamicsCompressorNode;
-    new(): DynamicsCompressorNode;
-};
-
-interface EXT_blend_minmax {
-    readonly MAX_EXT: number;
-    readonly MIN_EXT: number;
-}
-
-interface EXT_frag_depth {
-}
-
-interface EXT_sRGB {
-    readonly FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING_EXT: number;
-    readonly SRGB8_ALPHA8_EXT: number;
-    readonly SRGB_ALPHA_EXT: number;
-    readonly SRGB_EXT: number;
-}
-
-interface EXT_shader_texture_lod {
-}
-
-interface EXT_texture_filter_anisotropic {
-    readonly MAX_TEXTURE_MAX_ANISOTROPY_EXT: number;
-    readonly TEXTURE_MAX_ANISOTROPY_EXT: number;
-}
-
-declare var EXT_texture_filter_anisotropic: {
-    prototype: EXT_texture_filter_anisotropic;
-    new(): EXT_texture_filter_anisotropic;
-    readonly MAX_TEXTURE_MAX_ANISOTROPY_EXT: number;
-    readonly TEXTURE_MAX_ANISOTROPY_EXT: number;
-};
-
-interface ElementEventMap extends GlobalEventHandlersEventMap {
-    "ariarequest": Event;
-    "command": Event;
-    "gotpointercapture": PointerEvent;
-    "lostpointercapture": PointerEvent;
-    "MSGestureChange": Event;
-    "MSGestureDoubleTap": Event;
-    "MSGestureEnd": Event;
-    "MSGestureHold": Event;
-    "MSGestureStart": Event;
-    "MSGestureTap": Event;
-    "MSGotPointerCapture": Event;
-    "MSInertiaStart": Event;
-    "MSLostPointerCapture": Event;
-    "MSPointerCancel": Event;
-    "MSPointerDown": Event;
-    "MSPointerEnter": Event;
-    "MSPointerLeave": Event;
-    "MSPointerMove": Event;
-    "MSPointerOut": Event;
-    "MSPointerOver": Event;
-    "MSPointerUp": Event;
-    "touchcancel": TouchEvent;
-    "touchend": TouchEvent;
-    "touchmove": TouchEvent;
-    "touchstart": TouchEvent;
-    "webkitfullscreenchange": Event;
-    "webkitfullscreenerror": Event;
-}
-
-interface Element extends Node, GlobalEventHandlers, ElementTraversal, ParentNode, ChildNode {
-    readonly assignedSlot: HTMLSlotElement | null;
-    readonly attributes: NamedNodeMap;
-    readonly classList: DOMTokenList;
-    className: string;
-    readonly clientHeight: number;
-    readonly clientLeft: number;
-    readonly clientTop: number;
-    readonly clientWidth: number;
-    id: string;
-    innerHTML: string;
-    msContentZoomFactor: number;
-    readonly msRegionOverflow: string;
-    onariarequest: ((this: Element, ev: Event) => any) | null;
-    oncommand: ((this: Element, ev: Event) => any) | null;
-    ongotpointercapture: ((this: Element, ev: PointerEvent) => any) | null;
-    onlostpointercapture: ((this: Element, ev: PointerEvent) => any) | null;
-    onmsgesturechange: ((this: Element, ev: Event) => any) | null;
-    onmsgesturedoubletap: ((this: Element, ev: Event) => any) | null;
-    onmsgestureend: ((this: Element, ev: Event) => any) | null;
-    onmsgesturehold: ((this: Element, ev: Event) => any) | null;
-    onmsgesturestart: ((this: Element, ev: Event) => any) | null;
-    onmsgesturetap: ((this: Element, ev: Event) => any) | null;
-    onmsgotpointercapture: ((this: Element, ev: Event) => any) | null;
-    onmsinertiastart: ((this: Element, ev: Event) => any) | null;
-    onmslostpointercapture: ((this: Element, ev: Event) => any) | null;
-    onmspointercancel: ((this: Element, ev: Event) => any) | null;
-    onmspointerdown: ((this: Element, ev: Event) => any) | null;
-    onmspointerenter: ((this: Element, ev: Event) => any) | null;
-    onmspointerleave: ((this: Element, ev: Event) => any) | null;
-    onmspointermove: ((this: Element, ev: Event) => any) | null;
-    onmspointerout: ((this: Element, ev: Event) => any) | null;
-    onmspointerover: ((this: Element, ev: Event) => any) | null;
-    onmspointerup: ((this: Element, ev: Event) => any) | null;
-    ontouchcancel: ((this: Element, ev: TouchEvent) => any) | null;
-    ontouchend: ((this: Element, ev: TouchEvent) => any) | null;
-    ontouchmove: ((this: Element, ev: TouchEvent) => any) | null;
-    ontouchstart: ((this: Element, ev: TouchEvent) => any) | null;
-    onwebkitfullscreenchange: ((this: Element, ev: Event) => any) | null;
-    onwebkitfullscreenerror: ((this: Element, ev: Event) => any) | null;
-    outerHTML: string;
-    readonly prefix: string | null;
-    readonly scrollHeight: number;
-    scrollLeft: number;
-    scrollTop: number;
-    readonly scrollWidth: number;
-    readonly shadowRoot: ShadowRoot | null;
-    slot: string;
-    readonly tagName: string;
-    attachShadow(shadowRootInitDict: ShadowRootInit): ShadowRoot;
-    closest<K extends keyof HTMLElementTagNameMap>(selector: K): HTMLElementTagNameMap[K] | null;
-    closest<K extends keyof SVGElementTagNameMap>(selector: K): SVGElementTagNameMap[K] | null;
-    closest(selector: string): Element | null;
-    getAttribute(qualifiedName: string): string | null;
-    getAttributeNS(namespaceURI: string, localName: string): string;
-    getAttributeNode(name: string): Attr | null;
-    getAttributeNodeNS(namespaceURI: string, localName: string): Attr | null;
-    getBoundingClientRect(): ClientRect | DOMRect;
-    getClientRects(): ClientRectList | DOMRectList;
-    getElementsByClassName(classNames: string): NodeListOf<Element>;
-    getElementsByTagName<K extends keyof HTMLElementTagNameMap>(name: K): NodeListOf<HTMLElementTagNameMap[K]>;
-    getElementsByTagName<K extends keyof SVGElementTagNameMap>(name: K): NodeListOf<SVGElementTagNameMap[K]>;
-    getElementsByTagName(name: string): NodeListOf<Element>;
-    getElementsByTagNameNS(namespaceURI: "http://www.w3.org/1999/xhtml", localName: string): HTMLCollectionOf<HTMLElement>;
-    getElementsByTagNameNS(namespaceURI: "http://www.w3.org/2000/svg", localName: string): HTMLCollectionOf<SVGElement>;
-    getElementsByTagNameNS(namespaceURI: string, localName: string): HTMLCollectionOf<Element>;
-    hasAttribute(name: string): boolean;
-    hasAttributeNS(namespaceURI: string, localName: string): boolean;
-    hasAttributes(): boolean;
-    insertAdjacentElement(position: InsertPosition, insertedElement: Element): Element | null;
-    insertAdjacentHTML(where: InsertPosition, html: string): void;
-    insertAdjacentText(where: InsertPosition, text: string): void;
-    matches(selectors: string): boolean;
-    msGetRegionContent(): any;
-    msGetUntransformedBounds(): ClientRect;
-    msMatchesSelector(selectors: string): boolean;
-    msReleasePointerCapture(pointerId: number): void;
-    msSetPointerCapture(pointerId: number): void;
-    msZoomTo(args: MsZoomToOptions): void;
-    releasePointerCapture(pointerId: number): void;
-    removeAttribute(qualifiedName: string): void;
-    removeAttributeNS(namespaceURI: string, localName: string): void;
-    removeAttributeNode(oldAttr: Attr): Attr;
-    requestFullscreen(): void;
-    requestPointerLock(): void;
-    scroll(options?: ScrollToOptions): void;
-    scroll(x: number, y: number): void;
-    scrollBy(options?: ScrollToOptions): void;
-    scrollBy(x: number, y: number): void;
-    scrollIntoView(arg?: boolean | ScrollIntoViewOptions): void;
-    scrollTo(options?: ScrollToOptions): void;
-    scrollTo(x: number, y: number): void;
-    setAttribute(qualifiedName: string, value: string): void;
-    setAttributeNS(namespaceURI: string, qualifiedName: string, value: string): void;
-    setAttributeNode(newAttr: Attr): Attr;
-    setAttributeNodeNS(newAttr: Attr): Attr;
-    setPointerCapture(pointerId: number): void;
-    webkitMatchesSelector(selectors: string): boolean;
-    webkitRequestFullScreen(): void;
-    webkitRequestFullscreen(): void;
-    addEventListener<K extends keyof ElementEventMap>(type: K, listener: (this: Element, ev: ElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof ElementEventMap>(type: K, listener: (this: Element, ev: ElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var Element: {
-    prototype: Element;
-    new(): Element;
-};
-
-interface ElementCSSInlineStyle {
-    readonly style: CSSStyleDeclaration;
-}
-
-interface ElementCreationOptions {
-    is?: string;
-}
-
-interface ElementDefinitionOptions {
-    extends: string;
-}
-
-interface ElementTraversal {
-    readonly childElementCount: number;
-    readonly firstElementChild: Element | null;
-    readonly lastElementChild: Element | null;
-    readonly nextElementSibling: Element | null;
-    readonly previousElementSibling: Element | null;
-}
-
-interface ErrorEvent extends Event {
-    readonly colno: number;
-    readonly error: any;
-    readonly filename: string;
-    readonly lineno: number;
-    readonly message: string;
-    initErrorEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, messageArg: string, filenameArg: string, linenoArg: number): void;
-}
-
-declare var ErrorEvent: {
-    prototype: ErrorEvent;
-    new(typeArg: string, eventInitDict?: ErrorEventInit): ErrorEvent;
-};
-
-interface Event {
-    readonly bubbles: boolean;
-    cancelBubble: boolean;
-    readonly cancelable: boolean;
-    readonly currentTarget: EventTarget | null;
-    readonly defaultPrevented: boolean;
-    readonly eventPhase: number;
-    readonly isTrusted: boolean;
-    returnValue: boolean;
-    readonly scoped: boolean;
-    readonly srcElement: Element | null;
-    readonly target: EventTarget | null;
-    readonly timeStamp: number;
-    readonly type: string;
-    deepPath(): EventTarget[];
-    initEvent(type: string, bubbles?: boolean, cancelable?: boolean): void;
-    preventDefault(): void;
-    stopImmediatePropagation(): void;
-    stopPropagation(): void;
-    readonly AT_TARGET: number;
-    readonly BUBBLING_PHASE: number;
-    readonly CAPTURING_PHASE: number;
-    readonly NONE: number;
-}
-
-declare var Event: {
-    prototype: Event;
-    new(typeArg: string, eventInitDict?: EventInit): Event;
-    readonly AT_TARGET: number;
-    readonly BUBBLING_PHASE: number;
-    readonly CAPTURING_PHASE: number;
-    readonly NONE: number;
-};
-
-interface EventListenerObject {
-    handleEvent(evt: Event): void;
-}
-
-interface EventSource extends EventTarget {
-    readonly CLOSED: number;
-    readonly CONNECTING: number;
-    readonly OPEN: number;
-    onerror: (evt: MessageEvent) => any;
-    onmessage: (evt: MessageEvent) => any;
-    onopen: (evt: MessageEvent) => any;
-    readonly readyState: number;
-    readonly url: string;
-    readonly withCredentials: boolean;
-    close(): void;
-}
-
-declare var EventSource: {
-    prototype: EventSource;
-    new(url: string, eventSourceInitDict?: EventSourceInit): EventSource;
-};
-
-interface EventSourceInit {
-    readonly withCredentials: boolean;
-}
-
-interface EventTarget {
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject | null, options?: boolean | AddEventListenerOptions): void;
-    dispatchEvent(evt: Event): boolean;
-    removeEventListener(type: string, listener?: EventListenerOrEventListenerObject | null, options?: EventListenerOptions | boolean): void;
-}
-
-declare var EventTarget: {
-    prototype: EventTarget;
-    new(): EventTarget;
-};
-
-interface ExtensionScriptApis {
-    extensionIdToShortId(extensionId: string): number;
-    fireExtensionApiTelemetry(functionName: string, isSucceeded: boolean, isSupported: boolean, errorString: string): void;
-    genericFunction(routerAddress: any, parameters?: string, callbackId?: number): void;
-    genericSynchronousFunction(functionId: number, parameters?: string): string;
-    genericWebRuntimeCallout(to: any, from: any, payload: string): void;
-    getExtensionId(): string;
-    registerGenericFunctionCallbackHandler(callbackHandler: Function): void;
-    registerGenericPersistentCallbackHandler(callbackHandler: Function): void;
-    registerWebRuntimeCallbackHandler(handler: Function): any;
-}
-
-declare var ExtensionScriptApis: {
-    prototype: ExtensionScriptApis;
-    new(): ExtensionScriptApis;
-};
-
-interface External {
-}
-
-declare var External: {
-    prototype: External;
-    new(): External;
-};
-
-interface File extends Blob {
-    readonly lastModified: number;
-    /** @deprecated */
-    readonly lastModifiedDate: Date;
-    readonly name: string;
-    readonly webkitRelativePath: string;
-}
-
-declare var File: {
-    prototype: File;
-    new (parts: (ArrayBuffer | ArrayBufferView | Blob | string)[], filename: string, properties?: FilePropertyBag): File;
-};
-
-interface FileList {
-    readonly length: number;
-    item(index: number): File | null;
-    [index: number]: File;
-}
-
-declare var FileList: {
-    prototype: FileList;
-    new(): FileList;
-};
-
-interface FilePropertyBag extends BlobPropertyBag {
-    lastModified?: number;
-}
-
-interface FileReaderEventMap {
-    "abort": ProgressEvent;
-    "error": ProgressEvent;
-    "load": ProgressEvent;
-    "loadend": ProgressEvent;
-    "loadstart": ProgressEvent;
-    "progress": ProgressEvent;
-}
-
-interface FileReader extends EventTarget {
-    readonly error: DOMException | null;
-    onabort: ((this: FileReader, ev: FileReaderProgressEvent) => any) | null;
-    onerror: ((this: FileReader, ev: FileReaderProgressEvent) => any) | null;
-    onload: ((this: FileReader, ev: FileReaderProgressEvent) => any) | null;
-    onloadend: ((this: FileReader, ev: FileReaderProgressEvent) => any) | null;
-    onloadstart: ((this: FileReader, ev: FileReaderProgressEvent) => any) | null;
-    onprogress: ((this: FileReader, ev: FileReaderProgressEvent) => any) | null;
-    readonly readyState: number;
-    readonly result: any;
-    abort(): void;
-    readAsArrayBuffer(blob: Blob): void;
-    readAsBinaryString(blob: Blob): void;
-    readAsDataURL(blob: Blob): void;
-    readAsText(blob: Blob, label?: string): void;
-    readonly DONE: number;
-    readonly EMPTY: number;
-    readonly LOADING: number;
-    addEventListener<K extends keyof FileReaderEventMap>(type: K, listener: (this: FileReader, ev: FileReaderEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof FileReaderEventMap>(type: K, listener: (this: FileReader, ev: FileReaderEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var FileReader: {
-    prototype: FileReader;
-    new(): FileReader;
-    readonly DONE: number;
-    readonly EMPTY: number;
-    readonly LOADING: number;
-};
-
-interface FileReaderProgressEvent extends ProgressEvent {
-    readonly target: FileReader | null;
-}
-
-interface FocusEvent extends UIEvent {
-    readonly relatedTarget: EventTarget;
-    initFocusEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number, relatedTargetArg: EventTarget): void;
-}
-
-declare var FocusEvent: {
-    prototype: FocusEvent;
-    new(typeArg: string, eventInitDict?: FocusEventInit): FocusEvent;
-};
-
-interface FocusNavigationEvent extends Event {
-    readonly navigationReason: NavigationReason;
-    readonly originHeight: number;
-    readonly originLeft: number;
-    readonly originTop: number;
-    readonly originWidth: number;
-    requestFocus(): void;
-}
-
-declare var FocusNavigationEvent: {
-    prototype: FocusNavigationEvent;
-    new(type: string, eventInitDict?: FocusNavigationEventInit): FocusNavigationEvent;
-};
-
-interface FormData {
-    append(name: string, value: string | Blob, fileName?: string): void;
-    delete(name: string): void;
-    get(name: string): FormDataEntryValue | null;
-    getAll(name: string): FormDataEntryValue[];
-    has(name: string): boolean;
-    set(name: string, value: string | Blob, fileName?: string): void;
-}
-
-declare var FormData: {
-    prototype: FormData;
-    new(): FormData;
-    new(form: HTMLFormElement): FormData;
-};
-
-interface GainNode extends AudioNode {
-    readonly gain: AudioParam;
-}
-
-declare var GainNode: {
-    prototype: GainNode;
-    new(): GainNode;
-};
-
-interface Gamepad {
-    readonly axes: number[];
-    readonly buttons: GamepadButton[];
-    readonly connected: boolean;
-    readonly displayId: number;
-    readonly hand: GamepadHand;
-    readonly hapticActuators: GamepadHapticActuator[];
-    readonly id: string;
-    readonly index: number;
-    readonly mapping: GamepadMappingType;
-    readonly pose: GamepadPose | null;
-    readonly timestamp: number;
-}
-
-declare var Gamepad: {
-    prototype: Gamepad;
-    new(): Gamepad;
-};
-
-interface GamepadButton {
-    readonly pressed: boolean;
-    readonly touched: boolean;
-    readonly value: number;
-}
-
-declare var GamepadButton: {
-    prototype: GamepadButton;
-    new(): GamepadButton;
-};
-
-interface GamepadEvent extends Event {
-    readonly gamepad: Gamepad;
-}
-
-declare var GamepadEvent: {
-    prototype: GamepadEvent;
-    new(typeArg: string, eventInitDict?: GamepadEventInit): GamepadEvent;
-};
-
-interface GamepadHapticActuator {
-    readonly type: GamepadHapticActuatorType;
-    pulse(value: number, duration: number): Promise<boolean>;
-}
-
-declare var GamepadHapticActuator: {
-    prototype: GamepadHapticActuator;
-    new(): GamepadHapticActuator;
-};
-
-interface GamepadPose {
-    readonly angularAcceleration: Float32Array | null;
-    readonly angularVelocity: Float32Array | null;
-    readonly hasOrientation: boolean;
-    readonly hasPosition: boolean;
-    readonly linearAcceleration: Float32Array | null;
-    readonly linearVelocity: Float32Array | null;
-    readonly orientation: Float32Array | null;
-    readonly position: Float32Array | null;
-}
-
-declare var GamepadPose: {
-    prototype: GamepadPose;
-    new(): GamepadPose;
-};
-
-interface Geolocation {
-    clearWatch(watchId: number): void;
-    getCurrentPosition(successCallback: PositionCallback, errorCallback?: PositionErrorCallback, options?: PositionOptions): void;
-    watchPosition(successCallback: PositionCallback, errorCallback?: PositionErrorCallback, options?: PositionOptions): number;
-}
-
-declare var Geolocation: {
-    prototype: Geolocation;
-    new(): Geolocation;
-};
-
-interface GetSVGDocument {
-    getSVGDocument(): Document;
-}
-
-interface GlobalEventHandlersEventMap {
-    "pointercancel": PointerEvent;
-    "pointerdown": PointerEvent;
-    "pointerenter": PointerEvent;
-    "pointerleave": PointerEvent;
-    "pointermove": PointerEvent;
-    "pointerout": PointerEvent;
-    "pointerover": PointerEvent;
-    "pointerup": PointerEvent;
-    "wheel": WheelEvent;
-}
-
-interface GlobalEventHandlers {
-    onpointercancel: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
-    onpointerdown: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
-    onpointerenter: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
-    onpointerleave: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
-    onpointermove: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
-    onpointerout: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
-    onpointerover: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
-    onpointerup: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
-    onwheel: ((this: GlobalEventHandlers, ev: WheelEvent) => any) | null;
-    addEventListener<K extends keyof GlobalEventHandlersEventMap>(type: K, listener: (this: GlobalEventHandlers, ev: GlobalEventHandlersEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof GlobalEventHandlersEventMap>(type: K, listener: (this: GlobalEventHandlers, ev: GlobalEventHandlersEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-interface GlobalFetch {
-    fetch(input?: Request | string, init?: RequestInit): Promise<Response>;
-}
-
-interface HTMLAllCollection {
-    readonly length: number;
-    item(nameOrIndex?: string): HTMLCollection | Element | null;
-    namedItem(name: string): HTMLCollection | Element | null;
-    [index: number]: Element;
-}
-
-declare var HTMLAllCollection: {
-    prototype: HTMLAllCollection;
-    new(): HTMLAllCollection;
-};
-
-interface HTMLAnchorElement extends HTMLElement, HTMLHyperlinkElementUtils {
-    Methods: string;
-    /**
-     * Sets or retrieves the character set used to encode the object.
-     */
-    /** @deprecated */
-    charset: string;
-    /**
-     * Sets or retrieves the coordinates of the object.
-     */
-    /** @deprecated */
-    coords: string;
-    download: string;
-    /**
-     * Sets or retrieves the language code of the object.
-     */
-    hreflang: string;
-    readonly mimeType: string;
-    /**
-     * Sets or retrieves the shape of the object.
-     */
-    /** @deprecated */
-    name: string;
-    readonly nameProp: string;
-    readonly protocolLong: string;
-    /**
-     * Sets or retrieves the relationship between the object and the destination of the link.
-     */
-    rel: string;
-    /**
-     * Sets or retrieves the relationship between the object and the destination of the link.
-     */
-    /** @deprecated */
-    rev: string;
-    /**
-     * Sets or retrieves the shape of the object.
-     */
-    /** @deprecated */
-    shape: string;
-    /**
-     * Sets or retrieves the window or frame at which to target content.
-     */
-    target: string;
-    /**
-     * Retrieves or sets the text of the object as a string.
-     */
-    text: string;
-    type: string;
-    urn: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLAnchorElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLAnchorElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLAnchorElement: {
-    prototype: HTMLAnchorElement;
-    new(): HTMLAnchorElement;
-};
-
-interface HTMLAppletElement extends HTMLElement {
-    /** @deprecated */
-    align: string;
-    /**
-     * Sets or retrieves a text alternative to the graphic.
-     */
-    /** @deprecated */
-    alt: string;
-    /**
-     * Sets or retrieves a character string that can be used to implement your own archive functionality for the object.
-     */
-    /** @deprecated */
-    archive: string;
-    /** @deprecated */
-    code: string;
-    /**
-     * Sets or retrieves the URL of the component.
-     */
-    /** @deprecated */
-    codeBase: string;
-    readonly form: HTMLFormElement | null;
-    /**
-     * Sets or retrieves the height of the object.
-     */
-    /** @deprecated */
-    height: string;
-    /** @deprecated */
-    hspace: number;
-    /**
-     * Sets or retrieves the shape of the object.
-     */
-    /** @deprecated */
-    name: string;
-    /** @deprecated */
-    object: string;
-    /** @deprecated */
-    vspace: number;
-    /** @deprecated */
-    width: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLAppletElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLAppletElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLAppletElement: {
-    prototype: HTMLAppletElement;
-    new(): HTMLAppletElement;
-};
-
-interface HTMLAreaElement extends HTMLElement, HTMLHyperlinkElementUtils {
-    /**
-     * Sets or retrieves a text alternative to the graphic.
-     */
-    alt: string;
-    /**
-     * Sets or retrieves the coordinates of the object.
-     */
-    coords: string;
-    download: string;
-    /**
-     * Sets or gets whether clicks in this region cause action.
-     */
-    /** @deprecated */
-    noHref: boolean;
-    rel: string;
-    /**
-     * Sets or retrieves the shape of the object.
-     */
-    shape: string;
-    /**
-     * Sets or retrieves the window or frame at which to target content.
-     */
-    target: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLAreaElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLAreaElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLAreaElement: {
-    prototype: HTMLAreaElement;
-    new(): HTMLAreaElement;
-};
-
-interface HTMLAreasCollection extends HTMLCollectionBase {
-}
-
-declare var HTMLAreasCollection: {
-    prototype: HTMLAreasCollection;
-    new(): HTMLAreasCollection;
-};
-
-interface HTMLAudioElement extends HTMLMediaElement {
-    addEventListener<K extends keyof HTMLMediaElementEventMap>(type: K, listener: (this: HTMLAudioElement, ev: HTMLMediaElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLMediaElementEventMap>(type: K, listener: (this: HTMLAudioElement, ev: HTMLMediaElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLAudioElement: {
-    prototype: HTMLAudioElement;
-    new(): HTMLAudioElement;
-};
-
-interface HTMLBRElement extends HTMLElement {
-    /**
-     * Sets or retrieves the side on which floating objects are not to be positioned when any IHTMLBlockElement is inserted into the document.
-     */
-    /** @deprecated */
-    clear: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLBRElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLBRElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLBRElement: {
-    prototype: HTMLBRElement;
-    new(): HTMLBRElement;
-};
-
-interface HTMLBaseElement extends HTMLElement {
-    /**
-     * Gets or sets the baseline URL on which relative links are based.
-     */
-    href: string;
-    /**
-     * Sets or retrieves the window or frame at which to target content.
-     */
-    target: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLBaseElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLBaseElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLBaseElement: {
-    prototype: HTMLBaseElement;
-    new(): HTMLBaseElement;
-};
-
-interface HTMLBaseFontElement extends HTMLElement, DOML2DeprecatedColorProperty {
-    /**
-     * Sets or retrieves the current typeface family.
-     */
-    /** @deprecated */
-    face: string;
-    /**
-     * Sets or retrieves the font size of the object.
-     */
-    /** @deprecated */
-    size: number;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLBaseFontElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLBaseFontElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLBaseFontElement: {
-    prototype: HTMLBaseFontElement;
-    new(): HTMLBaseFontElement;
-};
-
-interface HTMLBodyElementEventMap extends HTMLElementEventMap, WindowEventHandlersEventMap {
-    "blur": FocusEvent;
-    "error": ErrorEvent;
-    "focus": FocusEvent;
-    "load": Event;
-    "orientationchange": Event;
-    "resize": UIEvent;
-    "scroll": UIEvent;
-}
-
-interface HTMLBodyElement extends HTMLElement, WindowEventHandlers {
-    /** @deprecated */
-    aLink: string;
-    /** @deprecated */
-    background: string;
-    /** @deprecated */
-    bgColor: string;
-    bgProperties: string;
-    /** @deprecated */
-    link: string;
-    /** @deprecated */
-    noWrap: boolean;
-    onorientationchange: ((this: HTMLBodyElement, ev: Event) => any) | null;
-    onresize: ((this: HTMLBodyElement, ev: UIEvent) => any) | null;
-    /** @deprecated */
-    text: string;
-    /** @deprecated */
-    vLink: string;
-    addEventListener<K extends keyof HTMLBodyElementEventMap>(type: K, listener: (this: HTMLBodyElement, ev: HTMLBodyElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLBodyElementEventMap>(type: K, listener: (this: HTMLBodyElement, ev: HTMLBodyElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLBodyElement: {
-    prototype: HTMLBodyElement;
-    new(): HTMLBodyElement;
-};
-
-interface HTMLButtonElement extends HTMLElement {
-    /**
-     * Provides a way to direct a user to a specific field when a document loads. This can provide both direction and convenience for a user, reducing the need to click or tab to a field when a page opens. This attribute is true when present on an element, and false when missing.
-     */
-    autofocus: boolean;
-    disabled: boolean;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Overrides the action attribute (where the data on a form is sent) on the parent form element.
-     */
-    formAction: string;
-    /**
-     * Used to override the encoding (formEnctype attribute) specified on the form element.
-     */
-    formEnctype: string;
-    /**
-     * Overrides the submit method attribute previously specified on a form element.
-     */
-    formMethod: string;
-    /**
-     * Overrides any validation or required attributes on a form or form elements to allow it to be submitted without validation. This can be used to create a "save draft"-type submit option.
-     */
-    formNoValidate: boolean;
-    /**
-     * Overrides the target attribute on a form element.
-     */
-    formTarget: string;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    name: string;
-    status: any;
-    /**
-     * Gets the classification and default behavior of the button.
-     */
-    type: string;
-    /**
-     * Returns the error message that would be displayed if the user submits the form, or an empty string if no error message. It also triggers the standard error message, such as "this is a required field". The result is that the user sees validation messages without actually submitting.
-     */
-    readonly validationMessage: string;
-    /**
-     * Returns a  ValidityState object that represents the validity states of an element.
-     */
-    readonly validity: ValidityState;
-    /**
-     * Sets or retrieves the default or selected value of the control.
-     */
-    value: string;
-    /**
-     * Returns whether an element will successfully validate based on forms validation rules and constraints.
-     */
-    readonly willValidate: boolean;
-    /**
-     * Returns whether a form will validate when it is submitted, without having to submit it.
-     */
-    checkValidity(): boolean;
-    /**
-     * Sets a custom error message that is displayed when a form is submitted.
-     * @param error Sets a custom error message that is displayed when a form is submitted.
-     */
-    setCustomValidity(error: string): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLButtonElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLButtonElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLButtonElement: {
-    prototype: HTMLButtonElement;
-    new(): HTMLButtonElement;
-};
-
-interface HTMLCanvasElement extends HTMLElement {
-    /**
-     * Gets or sets the height of a canvas element on a document.
-     */
-    height: number;
-    /**
-     * Gets or sets the width of a canvas element on a document.
-     */
-    width: number;
-    /**
-     * Returns an object that provides methods and properties for drawing and manipulating images and graphics on a canvas element in a document. A context object includes information about colors, line widths, fonts, and other graphic parameters that can be drawn on a canvas.
-     * @param contextId The identifier (ID) of the type of canvas to create. Internet Explorer 9 and Internet Explorer 10 support only a 2-D context using canvas.getContext("2d"); IE11 Preview also supports 3-D or WebGL context using canvas.getContext("experimental-webgl");
-     */
-    getContext(contextId: "2d", contextAttributes?: Canvas2DContextAttributes): CanvasRenderingContext2D | null;
-    getContext(contextId: "webgl" | "experimental-webgl", contextAttributes?: WebGLContextAttributes): WebGLRenderingContext | null;
-    getContext(contextId: string, contextAttributes?: {}): CanvasRenderingContext2D | WebGLRenderingContext | null;
-    /**
-     * Returns a blob object encoded as a Portable Network Graphics (PNG) format from a canvas image or drawing.
-     */
-    msToBlob(): Blob;
-    toBlob(callback: (result: Blob | null) => void, type?: string, ...arguments: any[]): void;
-    /**
-     * Returns the content of the current canvas as an image that you can use as a source for another canvas or an HTML element.
-     * @param type The standard MIME type for the image format to return. If you do not specify this parameter, the default value is a PNG format image.
-     */
-    toDataURL(type?: string, ...args: any[]): string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLCanvasElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLCanvasElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLCanvasElement: {
-    prototype: HTMLCanvasElement;
-    new(): HTMLCanvasElement;
-};
-
-interface HTMLCollectionBase {
-    /**
-     * Sets or retrieves the number of objects in a collection.
-     */
-    readonly length: number;
-    /**
-     * Retrieves an object from various collections.
-     */
-    item(index: number): Element;
-    [index: number]: Element;
-}
-
-interface HTMLCollection extends HTMLCollectionBase {
-    /**
-     * Retrieves a select object or an object from an options collection.
-     */
-    namedItem(name: string): Element | null;
-}
-
-declare var HTMLCollection: {
-    prototype: HTMLCollection;
-    new(): HTMLCollection;
-};
-
-interface HTMLCollectionOf<T extends Element> extends HTMLCollectionBase {
-    item(index: number): T;
-    namedItem(name: string): T;
-    [index: number]: T;
-}
-
-interface HTMLDListElement extends HTMLElement {
-    /** @deprecated */
-    compact: boolean;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDListElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDListElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLDListElement: {
-    prototype: HTMLDListElement;
-    new(): HTMLDListElement;
-};
-
-interface HTMLDataElement extends HTMLElement {
-    value: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDataElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDataElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLDataElement: {
-    prototype: HTMLDataElement;
-    new(): HTMLDataElement;
-};
-
-interface HTMLDataListElement extends HTMLElement {
-    readonly options: HTMLCollectionOf<HTMLOptionElement>;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDataListElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDataListElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLDataListElement: {
-    prototype: HTMLDataListElement;
-    new(): HTMLDataListElement;
-};
-
-interface HTMLDetailsElement extends HTMLElement {
-    open: boolean;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDetailsElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDetailsElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLDetailsElement: {
-    prototype: HTMLDetailsElement;
-    new(): HTMLDetailsElement;
-};
-
-interface HTMLDialogElement extends HTMLElement {
-    open: boolean;
-    returnValue: string;
-    close(returnValue?: string): void;
-    show(): void;
-    showModal(): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDialogElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDialogElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLDialogElement: {
-    prototype: HTMLDialogElement;
-    new(): HTMLDialogElement;
-};
-
-interface HTMLDirectoryElement extends HTMLElement {
-    compact: boolean;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDirectoryElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDirectoryElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLDirectoryElement: {
-    prototype: HTMLDirectoryElement;
-    new(): HTMLDirectoryElement;
-};
-
-interface HTMLDivElement extends HTMLElement {
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    /** @deprecated */
-    align: string;
-    /**
-     * Sets or retrieves whether the browser automatically performs wordwrap.
-     */
-    noWrap: boolean;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDivElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDivElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLDivElement: {
-    prototype: HTMLDivElement;
-    new(): HTMLDivElement;
-};
-
-interface HTMLDocument extends Document {
-    addEventListener<K extends keyof DocumentEventMap>(type: K, listener: (this: HTMLDocument, ev: DocumentEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof DocumentEventMap>(type: K, listener: (this: HTMLDocument, ev: DocumentEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLDocument: {
-    prototype: HTMLDocument;
-    new(): HTMLDocument;
-};
-
-interface HTMLElementEventMap extends ElementEventMap {
-    "abort": UIEvent;
-    "activate": Event;
-    "beforeactivate": Event;
-    "beforecopy": Event;
-    "beforecut": Event;
-    "beforedeactivate": Event;
-    "beforepaste": Event;
-    "blur": FocusEvent;
-    "canplay": Event;
-    "canplaythrough": Event;
-    "change": Event;
-    "click": MouseEvent;
-    "contextmenu": PointerEvent;
-    "copy": ClipboardEvent;
-    "cuechange": Event;
-    "cut": ClipboardEvent;
-    "dblclick": MouseEvent;
-    "deactivate": Event;
-    "drag": DragEvent;
-    "dragend": DragEvent;
-    "dragenter": DragEvent;
-    "dragleave": DragEvent;
-    "dragover": DragEvent;
-    "dragstart": DragEvent;
-    "drop": DragEvent;
-    "durationchange": Event;
-    "emptied": Event;
-    "ended": Event;
-    "error": ErrorEvent;
-    "focus": FocusEvent;
-    "input": Event;
-    "invalid": Event;
-    "keydown": KeyboardEvent;
-    "keypress": KeyboardEvent;
-    "keyup": KeyboardEvent;
-    "load": Event;
-    "loadeddata": Event;
-    "loadedmetadata": Event;
-    "loadstart": Event;
-    "mousedown": MouseEvent;
-    "mouseenter": MouseEvent;
-    "mouseleave": MouseEvent;
-    "mousemove": MouseEvent;
-    "mouseout": MouseEvent;
-    "mouseover": MouseEvent;
-    "mouseup": MouseEvent;
-    "mousewheel": WheelEvent;
-    "MSContentZoom": Event;
-    "MSManipulationStateChanged": Event;
-    "paste": ClipboardEvent;
-    "pause": Event;
-    "play": Event;
-    "playing": Event;
-    "progress": ProgressEvent;
-    "ratechange": Event;
-    "reset": Event;
-    "scroll": UIEvent;
-    "seeked": Event;
-    "seeking": Event;
-    "select": UIEvent;
-    "selectstart": Event;
-    "stalled": Event;
-    "submit": Event;
-    "suspend": Event;
-    "timeupdate": Event;
-    "volumechange": Event;
-    "waiting": Event;
-}
-
-interface HTMLElement extends Element, ElementCSSInlineStyle {
-    accessKey: string;
-    contentEditable: string;
-    readonly dataset: DOMStringMap;
-    dir: string;
-    draggable: boolean;
-    hidden: boolean;
-    hideFocus: boolean;
-    innerText: string;
-    readonly isContentEditable: boolean;
-    lang: string;
-    readonly offsetHeight: number;
-    readonly offsetLeft: number;
-    readonly offsetParent: Element;
-    readonly offsetTop: number;
-    readonly offsetWidth: number;
-    onabort: ((this: HTMLElement, ev: UIEvent) => any) | null;
-    onactivate: ((this: HTMLElement, ev: Event) => any) | null;
-    onbeforeactivate: ((this: HTMLElement, ev: Event) => any) | null;
-    onbeforecopy: ((this: HTMLElement, ev: Event) => any) | null;
-    onbeforecut: ((this: HTMLElement, ev: Event) => any) | null;
-    onbeforedeactivate: ((this: HTMLElement, ev: Event) => any) | null;
-    onbeforepaste: ((this: HTMLElement, ev: Event) => any) | null;
-    onblur: ((this: HTMLElement, ev: FocusEvent) => any) | null;
-    oncanplay: ((this: HTMLElement, ev: Event) => any) | null;
-    oncanplaythrough: ((this: HTMLElement, ev: Event) => any) | null;
-    onchange: ((this: HTMLElement, ev: Event) => any) | null;
-    onclick: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    oncontextmenu: ((this: HTMLElement, ev: PointerEvent) => any) | null;
-    oncopy: ((this: HTMLElement, ev: ClipboardEvent) => any) | null;
-    oncuechange: ((this: HTMLElement, ev: Event) => any) | null;
-    oncut: ((this: HTMLElement, ev: ClipboardEvent) => any) | null;
-    ondblclick: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    ondeactivate: ((this: HTMLElement, ev: Event) => any) | null;
-    ondrag: ((this: HTMLElement, ev: DragEvent) => any) | null;
-    ondragend: ((this: HTMLElement, ev: DragEvent) => any) | null;
-    ondragenter: ((this: HTMLElement, ev: DragEvent) => any) | null;
-    ondragleave: ((this: HTMLElement, ev: DragEvent) => any) | null;
-    ondragover: ((this: HTMLElement, ev: DragEvent) => any) | null;
-    ondragstart: ((this: HTMLElement, ev: DragEvent) => any) | null;
-    ondrop: ((this: HTMLElement, ev: DragEvent) => any) | null;
-    ondurationchange: ((this: HTMLElement, ev: Event) => any) | null;
-    onemptied: ((this: HTMLElement, ev: Event) => any) | null;
-    onended: ((this: HTMLElement, ev: Event) => any) | null;
-    onerror: ((this: HTMLElement, ev: ErrorEvent) => any) | null;
-    onfocus: ((this: HTMLElement, ev: FocusEvent) => any) | null;
-    oninput: ((this: HTMLElement, ev: Event) => any) | null;
-    oninvalid: ((this: HTMLElement, ev: Event) => any) | null;
-    onkeydown: ((this: HTMLElement, ev: KeyboardEvent) => any) | null;
-    onkeypress: ((this: HTMLElement, ev: KeyboardEvent) => any) | null;
-    onkeyup: ((this: HTMLElement, ev: KeyboardEvent) => any) | null;
-    onload: ((this: HTMLElement, ev: Event) => any) | null;
-    onloadeddata: ((this: HTMLElement, ev: Event) => any) | null;
-    onloadedmetadata: ((this: HTMLElement, ev: Event) => any) | null;
-    onloadstart: ((this: HTMLElement, ev: Event) => any) | null;
-    onmousedown: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    onmouseenter: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    onmouseleave: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    onmousemove: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    onmouseout: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    onmouseover: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    onmouseup: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    onmousewheel: ((this: HTMLElement, ev: WheelEvent) => any) | null;
-    onmscontentzoom: ((this: HTMLElement, ev: Event) => any) | null;
-    onmsmanipulationstatechanged: ((this: HTMLElement, ev: Event) => any) | null;
-    onpaste: ((this: HTMLElement, ev: ClipboardEvent) => any) | null;
-    onpause: ((this: HTMLElement, ev: Event) => any) | null;
-    onplay: ((this: HTMLElement, ev: Event) => any) | null;
-    onplaying: ((this: HTMLElement, ev: Event) => any) | null;
-    onprogress: ((this: HTMLElement, ev: ProgressEvent) => any) | null;
-    onratechange: ((this: HTMLElement, ev: Event) => any) | null;
-    onreset: ((this: HTMLElement, ev: Event) => any) | null;
-    onscroll: ((this: HTMLElement, ev: UIEvent) => any) | null;
-    onseeked: ((this: HTMLElement, ev: Event) => any) | null;
-    onseeking: ((this: HTMLElement, ev: Event) => any) | null;
-    onselect: ((this: HTMLElement, ev: UIEvent) => any) | null;
-    onselectstart: ((this: HTMLElement, ev: Event) => any) | null;
-    onstalled: ((this: HTMLElement, ev: Event) => any) | null;
-    onsubmit: ((this: HTMLElement, ev: Event) => any) | null;
-    onsuspend: ((this: HTMLElement, ev: Event) => any) | null;
-    ontimeupdate: ((this: HTMLElement, ev: Event) => any) | null;
-    onvolumechange: ((this: HTMLElement, ev: Event) => any) | null;
-    onwaiting: ((this: HTMLElement, ev: Event) => any) | null;
-    outerText: string;
-    spellcheck: boolean;
-    tabIndex: number;
-    title: string;
-    animate(keyframes: AnimationKeyFrame | AnimationKeyFrame[], options: number | AnimationOptions): Animation;
-    blur(): void;
-    click(): void;
-    dragDrop(): boolean;
-    focus(): void;
-    msGetInputContext(): MSInputMethodContext;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLElement: {
-    prototype: HTMLElement;
-    new(): HTMLElement;
-};
-
-interface HTMLEmbedElement extends HTMLElement, GetSVGDocument {
-    /**
-     * Sets or retrieves the height of the object.
-     */
-    height: string;
-    hidden: any;
-    /**
-     * Gets or sets whether the DLNA PlayTo device is available.
-     */
-    msPlayToDisabled: boolean;
-    /**
-     * Gets or sets the path to the preferred media source. This enables the Play To target device to stream the media content, which can be DRM protected, from a different location, such as a cloud media server.
-     */
-    msPlayToPreferredSourceUri: string;
-    /**
-     * Gets or sets the primary DLNA PlayTo device.
-     */
-    msPlayToPrimary: boolean;
-    /**
-     * Gets the source associated with the media element for use by the PlayToManager.
-     */
-    readonly msPlayToSource: any;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    /** @deprecated */
-    name: string;
-    /**
-     * Retrieves the palette used for the embedded document.
-     */
-    readonly palette: string;
-    /**
-     * Retrieves the URL of the plug-in used to view an embedded document.
-     */
-    readonly pluginspage: string;
-    readonly readyState: string;
-    /**
-     * Sets or retrieves a URL to be loaded by the object.
-     */
-    src: string;
-    /**
-     * Sets or retrieves the height and width units of the embed object.
-     */
-    units: string;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    width: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLEmbedElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLEmbedElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLEmbedElement: {
-    prototype: HTMLEmbedElement;
-    new(): HTMLEmbedElement;
-};
-
-interface HTMLFieldSetElement extends HTMLElement {
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    align: string;
-    disabled: boolean;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    name: string;
-    /**
-     * Returns the error message that would be displayed if the user submits the form, or an empty string if no error message. It also triggers the standard error message, such as "this is a required field". The result is that the user sees validation messages without actually submitting.
-     */
-    readonly validationMessage: string;
-    /**
-     * Returns a  ValidityState object that represents the validity states of an element.
-     */
-    readonly validity: ValidityState;
-    /**
-     * Returns whether an element will successfully validate based on forms validation rules and constraints.
-     */
-    readonly willValidate: boolean;
-    /**
-     * Returns whether a form will validate when it is submitted, without having to submit it.
-     */
-    checkValidity(): boolean;
-    /**
-     * Sets a custom error message that is displayed when a form is submitted.
-     * @param error Sets a custom error message that is displayed when a form is submitted.
-     */
-    setCustomValidity(error: string): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLFieldSetElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLFieldSetElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLFieldSetElement: {
-    prototype: HTMLFieldSetElement;
-    new(): HTMLFieldSetElement;
-};
-
-interface HTMLFontElement extends HTMLElement, DOML2DeprecatedColorProperty, DOML2DeprecatedSizeProperty {
-    /**
-     * Sets or retrieves the current typeface family.
-     */
-    /** @deprecated */
-    face: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLFontElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLFontElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLFontElement: {
-    prototype: HTMLFontElement;
-    new(): HTMLFontElement;
-};
-
-interface HTMLFormControlsCollection extends HTMLCollectionBase {
-    namedItem(name: string): HTMLCollection | Element | null;
-}
-
-declare var HTMLFormControlsCollection: {
-    prototype: HTMLFormControlsCollection;
-    new(): HTMLFormControlsCollection;
-};
-
-interface HTMLFormElement extends HTMLElement {
-    /**
-     * Sets or retrieves a list of character encodings for input data that must be accepted by the server processing the form.
-     */
-    acceptCharset: string;
-    /**
-     * Sets or retrieves the URL to which the form content is sent for processing.
-     */
-    action: string;
-    /**
-     * Specifies whether autocomplete is applied to an editable text field.
-     */
-    autocomplete: string;
-    /**
-     * Retrieves a collection, in source order, of all controls in a given form.
-     */
-    readonly elements: HTMLFormControlsCollection;
-    /**
-     * Sets or retrieves the MIME encoding for the form.
-     */
-    encoding: string;
-    /**
-     * Sets or retrieves the encoding type for the form.
-     */
-    enctype: string;
-    /**
-     * Sets or retrieves the number of objects in a collection.
-     */
-    readonly length: number;
-    /**
-     * Sets or retrieves how to send the form data to the server.
-     */
-    method: string;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    name: string;
-    /**
-     * Designates a form that is not validated when submitted.
-     */
-    noValidate: boolean;
-    /**
-     * Sets or retrieves the window or frame at which to target content.
-     */
-    target: string;
-    /**
-     * Returns whether a form will validate when it is submitted, without having to submit it.
-     */
-    checkValidity(): boolean;
-    /**
-     * Retrieves a form object or an object from an elements collection.
-     * @param name Variant of type Number or String that specifies the object or collection to retrieve. If this parameter is a Number, it is the zero-based index of the object. If this parameter is a string, all objects with matching name or id properties are retrieved, and a collection is returned if more than one match is made.
-     * @param index Variant of type Number that specifies the zero-based index of the object to retrieve when a collection is returned.
-     */
-    item(name?: any, index?: any): any;
-    /**
-     * Retrieves a form object or an object from an elements collection.
-     */
-    namedItem(name: string): any;
-    reportValidity(): boolean;
-    /**
-     * Fires when the user resets a form.
-     */
-    reset(): void;
-    /**
-     * Fires when a FORM is about to be submitted.
-     */
-    submit(): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLFormElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLFormElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-    [name: string]: any;
-}
-
-declare var HTMLFormElement: {
-    prototype: HTMLFormElement;
-    new(): HTMLFormElement;
-};
-
-interface HTMLFrameElementEventMap extends HTMLElementEventMap {
-    "load": Event;
-}
-
-interface HTMLFrameElement extends HTMLElement, GetSVGDocument {
-    /**
-     * Specifies the properties of a border drawn around an object.
-     */
-    border: string;
-    /**
-     * Sets or retrieves the border color of the object.
-     */
-    borderColor: any;
-    /**
-     * Retrieves the document object of the page or frame.
-     */
-    /** @deprecated */
-    readonly contentDocument: Document | null;
-    /**
-     * Retrieves the object of the specified.
-     */
-    /** @deprecated */
-    readonly contentWindow: Window | null;
-    /**
-     * Sets or retrieves whether to display a border for the frame.
-     */
-    /** @deprecated */
-    frameBorder: string;
-    /**
-     * Sets or retrieves the amount of additional space between the frames.
-     */
-    frameSpacing: any;
-    /**
-     * Sets or retrieves the height of the object.
-     */
-    height: string | number;
-    /**
-     * Sets or retrieves a URI to a long description of the object.
-     */
-    /** @deprecated */
-    longDesc: string;
-    /**
-     * Sets or retrieves the top and bottom margin heights before displaying the text in a frame.
-     */
-    /** @deprecated */
-    marginHeight: string;
-    /**
-     * Sets or retrieves the left and right margin widths before displaying the text in a frame.
-     */
-    /** @deprecated */
-    marginWidth: string;
-    /**
-     * Sets or retrieves the frame name.
-     */
-    /** @deprecated */
-    name: string;
-    /**
-     * Sets or retrieves whether the user can resize the frame.
-     */
-    /** @deprecated */
-    noResize: boolean;
-    /**
-     * Sets or retrieves whether the frame can be scrolled.
-     */
-    /** @deprecated */
-    scrolling: string;
-    /**
-     * Sets or retrieves a URL to be loaded by the object.
-     */
-    /** @deprecated */
-    src: string;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    width: string | number;
-    addEventListener<K extends keyof HTMLFrameElementEventMap>(type: K, listener: (this: HTMLFrameElement, ev: HTMLFrameElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLFrameElementEventMap>(type: K, listener: (this: HTMLFrameElement, ev: HTMLFrameElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLFrameElement: {
-    prototype: HTMLFrameElement;
-    new(): HTMLFrameElement;
-};
-
-interface HTMLFrameSetElementEventMap extends HTMLElementEventMap, WindowEventHandlersEventMap {
-    "blur": FocusEvent;
-    "error": ErrorEvent;
-    "focus": FocusEvent;
-    "load": Event;
-    "orientationchange": Event;
-    "resize": UIEvent;
-    "scroll": UIEvent;
-}
-
-interface HTMLFrameSetElement extends HTMLElement, WindowEventHandlers {
-    /**
-     * Sets or retrieves the frame widths of the object.
-     */
-    /** @deprecated */
-    cols: string;
-    name: string;
-    onorientationchange: ((this: HTMLFrameSetElement, ev: Event) => any) | null;
-    onresize: ((this: HTMLFrameSetElement, ev: UIEvent) => any) | null;
-    /**
-     * Sets or retrieves the frame heights of the object.
-     */
-    /** @deprecated */
-    rows: string;
-    addEventListener<K extends keyof HTMLFrameSetElementEventMap>(type: K, listener: (this: HTMLFrameSetElement, ev: HTMLFrameSetElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLFrameSetElementEventMap>(type: K, listener: (this: HTMLFrameSetElement, ev: HTMLFrameSetElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLFrameSetElement: {
-    prototype: HTMLFrameSetElement;
-    new(): HTMLFrameSetElement;
-};
-
-interface HTMLHRElement extends HTMLElement, DOML2DeprecatedColorProperty, DOML2DeprecatedSizeProperty {
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    /** @deprecated */
-    align: string;
-    /**
-     * Sets or retrieves whether the horizontal rule is drawn with 3-D shading.
-     */
-    /** @deprecated */
-    noShade: boolean;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    /** @deprecated */
-    width: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLHRElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLHRElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLHRElement: {
-    prototype: HTMLHRElement;
-    new(): HTMLHRElement;
-};
-
-interface HTMLHeadElement extends HTMLElement {
-    /** @deprecated */
-    profile: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLHeadElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLHeadElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLHeadElement: {
-    prototype: HTMLHeadElement;
-    new(): HTMLHeadElement;
-};
-
-interface HTMLHeadingElement extends HTMLElement {
-    /**
-     * Sets or retrieves a value that indicates the table alignment.
-     */
-    /** @deprecated */
-    align: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLHeadingElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLHeadingElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLHeadingElement: {
-    prototype: HTMLHeadingElement;
-    new(): HTMLHeadingElement;
-};
-
-interface HTMLHtmlElement extends HTMLElement {
-    /**
-     * Sets or retrieves the DTD version that governs the current document.
-     */
-    /** @deprecated */
-    version: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLHtmlElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLHtmlElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLHtmlElement: {
-    prototype: HTMLHtmlElement;
-    new(): HTMLHtmlElement;
-};
-
-interface HTMLHyperlinkElementUtils {
-    hash: string;
-    host: string;
-    hostname: string;
-    href: string;
-    origin: string;
-    pathname: string;
-    port: string;
-    protocol: string;
-    search: string;
-    toString(): string;
-}
-
-interface HTMLIFrameElementEventMap extends HTMLElementEventMap {
-    "load": Event;
-}
-
-interface HTMLIFrameElement extends HTMLElement, GetSVGDocument {
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    /** @deprecated */
-    align: string;
-    allowFullscreen: boolean;
-    allowPaymentRequest: boolean;
-    /**
-     * Retrieves the document object of the page or frame.
-     */
-    readonly contentDocument: Document | null;
-    /**
-     * Retrieves the object of the specified.
-     */
-    readonly contentWindow: Window | null;
-    /**
-     * Sets or retrieves whether to display a border for the frame.
-     */
-    /** @deprecated */
-    frameBorder: string;
-    /**
-     * Sets or retrieves the height of the object.
-     */
-    height: string;
-    /**
-     * Sets or retrieves a URI to a long description of the object.
-     */
-    /** @deprecated */
-    longDesc: string;
-    /**
-     * Sets or retrieves the top and bottom margin heights before displaying the text in a frame.
-     */
-    /** @deprecated */
-    marginHeight: string;
-    /**
-     * Sets or retrieves the left and right margin widths before displaying the text in a frame.
-     */
-    /** @deprecated */
-    marginWidth: string;
-    /**
-     * Sets or retrieves the frame name.
-     */
-    name: string;
-    readonly sandbox: DOMTokenList;
-    /**
-     * Sets or retrieves whether the frame can be scrolled.
-     */
-    /** @deprecated */
-    scrolling: string;
-    /**
-     * Sets or retrieves a URL to be loaded by the object.
-     */
-    src: string;
-    /**
-     * Sets or retrives the content of the page that is to contain.
-     */
-    srcdoc: string;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    width: string;
-    addEventListener<K extends keyof HTMLIFrameElementEventMap>(type: K, listener: (this: HTMLIFrameElement, ev: HTMLIFrameElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLIFrameElementEventMap>(type: K, listener: (this: HTMLIFrameElement, ev: HTMLIFrameElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLIFrameElement: {
-    prototype: HTMLIFrameElement;
-    new(): HTMLIFrameElement;
-};
-
-interface HTMLImageElement extends HTMLElement {
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    /** @deprecated */
-    align: string;
-    /**
-     * Sets or retrieves a text alternative to the graphic.
-     */
-    alt: string;
-    /**
-     * Specifies the properties of a border drawn around an object.
-     */
-    /** @deprecated */
-    border: string;
-    /**
-     * Retrieves whether the object is fully loaded.
-     */
-    readonly complete: boolean;
-    crossOrigin: string | null;
-    readonly currentSrc: string;
-    decoding: "async" | "sync" | "auto";
-    /**
-     * Sets or retrieves the height of the object.
-     */
-    height: number;
-    /**
-     * Sets or retrieves the width of the border to draw around the object.
-     */
-    /** @deprecated */
-    hspace: number;
-    /**
-     * Sets or retrieves whether the image is a server-side image map.
-     */
-    isMap: boolean;
-    /**
-     * Sets or retrieves a Uniform Resource Identifier (URI) to a long description of the object.
-     */
-    longDesc: string;
-    /** @deprecated */
-    lowsrc: string;
-    /**
-     * Gets or sets whether the DLNA PlayTo device is available.
-     */
-    msPlayToDisabled: boolean;
-    msPlayToPreferredSourceUri: string;
-    /**
-     * Gets or sets the primary DLNA PlayTo device.
-     */
-    msPlayToPrimary: boolean;
-    /**
-     * Gets the source associated with the media element for use by the PlayToManager.
-     */
-    readonly msPlayToSource: any;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    /** @deprecated */
-    name: string;
-    /**
-     * The original height of the image resource before sizing.
-     */
-    readonly naturalHeight: number;
-    /**
-     * The original width of the image resource before sizing.
-     */
-    readonly naturalWidth: number;
-    sizes: string;
-    /**
-     * The address or URL of the a media resource that is to be considered.
-     */
-    src: string;
-    srcset: string;
-    /**
-     * Sets or retrieves the URL, often with a bookmark extension (#name), to use as a client-side image map.
-     */
-    useMap: string;
-    /**
-     * Sets or retrieves the vertical margin for the object.
-     */
-    /** @deprecated */
-    vspace: number;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    width: number;
-    readonly x: number;
-    readonly y: number;
-    msGetAsCastingSource(): any;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLImageElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLImageElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLImageElement: {
-    prototype: HTMLImageElement;
-    new(): HTMLImageElement;
-};
-
-interface HTMLInputElement extends HTMLElement {
-    /**
-     * Sets or retrieves a comma-separated list of content types.
-     */
-    accept: string;
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    /** @deprecated */
-    align: string;
-    /**
-     * Sets or retrieves a text alternative to the graphic.
-     */
-    alt: string;
-    /**
-     * Specifies whether autocomplete is applied to an editable text field.
-     */
-    autocomplete: string;
-    /**
-     * Provides a way to direct a user to a specific field when a document loads. This can provide both direction and convenience for a user, reducing the need to click or tab to a field when a page opens. This attribute is true when present on an element, and false when missing.
-     */
-    autofocus: boolean;
-    /**
-     * Sets or retrieves the state of the check box or radio button.
-     */
-    checked: boolean;
-    /**
-     * Sets or retrieves the state of the check box or radio button.
-     */
-    defaultChecked: boolean;
-    /**
-     * Sets or retrieves the initial contents of the object.
-     */
-    defaultValue: string;
-    disabled: boolean;
-    /**
-     * Returns a FileList object on a file type input object.
-     */
-    files: FileList | null;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Overrides the action attribute (where the data on a form is sent) on the parent form element.
-     */
-    formAction: string;
-    /**
-     * Used to override the encoding (formEnctype attribute) specified on the form element.
-     */
-    formEnctype: string;
-    /**
-     * Overrides the submit method attribute previously specified on a form element.
-     */
-    formMethod: string;
-    /**
-     * Overrides any validation or required attributes on a form or form elements to allow it to be submitted without validation. This can be used to create a "save draft"-type submit option.
-     */
-    formNoValidate: boolean;
-    /**
-     * Overrides the target attribute on a form element.
-     */
-    formTarget: string;
-    /**
-     * Sets or retrieves the height of the object.
-     */
-    height: number;
-    indeterminate: boolean;
-    /**
-     * Specifies the ID of a pre-defined datalist of options for an input element.
-     */
-    readonly list: HTMLElement | null;
-    /**
-     * Defines the maximum acceptable value for an input element with type="number".When used with the min and step attributes, lets you control the range and increment (such as only even numbers) that the user can enter into an input field.
-     */
-    max: string;
-    /**
-     * Sets or retrieves the maximum number of characters that the user can enter in a text control.
-     */
-    maxLength: number;
-    /**
-     * Defines the minimum acceptable value for an input element with type="number". When used with the max and step attributes, lets you control the range and increment (such as even numbers only) that the user can enter into an input field.
-     */
-    min: string;
-    minLength: number;
-    /**
-     * Sets or retrieves the Boolean value indicating whether multiple items can be selected from a list.
-     */
-    multiple: boolean;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    name: string;
-    /**
-     * Gets or sets a string containing a regular expression that the user's input must match.
-     */
-    pattern: string;
-    /**
-     * Gets or sets a text string that is displayed in an input field as a hint or prompt to users as the format or type of information they need to enter.The text appears in an input field until the user puts focus on the field.
-     */
-    placeholder: string;
-    readOnly: boolean;
-    /**
-     * When present, marks an element that can't be submitted without a value.
-     */
-    required: boolean;
-    selectionDirection: string | null;
-    /**
-     * Gets or sets the end position or offset of a text selection.
-     */
-    selectionEnd: number | null;
-    /**
-     * Gets or sets the starting position or offset of a text selection.
-     */
-    selectionStart: number | null;
-    size: number;
-    /**
-     * The address or URL of the a media resource that is to be considered.
-     */
-    src: string;
-    /**
-     * Defines an increment or jump between values that you want to allow the user to enter. When used with the max and min attributes, lets you control the range and increment (for example, allow only even numbers) that the user can enter into an input field.
-     */
-    step: string;
-    /**
-     * Returns the content type of the object.
-     */
-    type: string;
-    /**
-     * Sets or retrieves the URL, often with a bookmark extension (#name), to use as a client-side image map.
-     */
-    /** @deprecated */
-    useMap: string;
-    /**
-     * Returns the error message that would be displayed if the user submits the form, or an empty string if no error message. It also triggers the standard error message, such as "this is a required field". The result is that the user sees validation messages without actually submitting.
-     */
-    readonly validationMessage: string;
-    /**
-     * Returns a  ValidityState object that represents the validity states of an element.
-     */
-    readonly validity: ValidityState;
-    /**
-     * Returns the value of the data at the cursor's current position.
-     */
-    value: string;
-    valueAsDate: any;
-    /**
-     * Returns the input field value as a number.
-     */
-    valueAsNumber: number;
-    webkitdirectory: boolean;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    width: number;
-    /**
-     * Returns whether an element will successfully validate based on forms validation rules and constraints.
-     */
-    readonly willValidate: boolean;
-    /**
-     * Returns whether a form will validate when it is submitted, without having to submit it.
-     */
-    checkValidity(): boolean;
-    /**
-     * Makes the selection equal to the current object.
-     */
-    select(): void;
-    /**
-     * Sets a custom error message that is displayed when a form is submitted.
-     * @param error Sets a custom error message that is displayed when a form is submitted.
-     */
-    setCustomValidity(error: string): void;
-    /**
-     * Sets the start and end positions of a selection in a text field.
-     * @param start The offset into the text field for the start of the selection.
-     * @param end The offset into the text field for the end of the selection.
-     * @param direction The direction in which the selection is performed.
-     */
-    setSelectionRange(start: number, end: number, direction?: "forward" | "backward" | "none"): void;
-    /**
-     * Decrements a range input control's value by the value given by the Step attribute. If the optional parameter is used, it will decrement the input control's step value multiplied by the parameter's value.
-     * @param n Value to decrement the value by.
-     */
-    stepDown(n?: number): void;
-    /**
-     * Increments a range input control's value by the value given by the Step attribute. If the optional parameter is used, will increment the input control's value by that value.
-     * @param n Value to increment the value by.
-     */
-    stepUp(n?: number): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLInputElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLInputElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLInputElement: {
-    prototype: HTMLInputElement;
-    new(): HTMLInputElement;
-};
-
-interface HTMLLIElement extends HTMLElement {
-    /** @deprecated */
-    type: string;
-    /**
-     * Sets or retrieves the value of a list item.
-     */
-    value: number;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLLIElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLLIElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLLIElement: {
-    prototype: HTMLLIElement;
-    new(): HTMLLIElement;
-};
-
-interface HTMLLabelElement extends HTMLElement {
-    readonly control: HTMLInputElement | null;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Sets or retrieves the object to which the given label object is assigned.
-     */
-    htmlFor: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLLabelElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLLabelElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLLabelElement: {
-    prototype: HTMLLabelElement;
-    new(): HTMLLabelElement;
-};
-
-interface HTMLLegendElement extends HTMLElement {
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    /** @deprecated */
-    align: string;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLLegendElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLLegendElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLLegendElement: {
-    prototype: HTMLLegendElement;
-    new(): HTMLLegendElement;
-};
-
-interface HTMLLinkElement extends HTMLElement, LinkStyle {
-    /**
-     * Sets or retrieves the character set used to encode the object.
-     */
-    /** @deprecated */
-    charset: string;
-    crossOrigin: string | null;
-    /** @deprecated */
-    disabled: boolean;
-    /**
-     * Sets or retrieves a destination URL or an anchor point.
-     */
-    href: string;
-    /**
-     * Sets or retrieves the language code of the object.
-     */
-    hreflang: string;
-    import?: Document;
-    integrity: string;
-    /**
-     * Sets or retrieves the media type.
-     */
-    media: string;
-    /**
-     * Sets or retrieves the relationship between the object and the destination of the link.
-     */
-    rel: string;
-    /**
-     * Sets or retrieves the relationship between the object and the destination of the link.
-     */
-    /** @deprecated */
-    rev: string;
-    /**
-     * Sets or retrieves the window or frame at which to target content.
-     */
-    /** @deprecated */
-    target: string;
-    /**
-     * Sets or retrieves the MIME type of the object.
-     */
-    type: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLLinkElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLLinkElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLLinkElement: {
-    prototype: HTMLLinkElement;
-    new(): HTMLLinkElement;
-};
-
-interface HTMLMainElement extends HTMLElement {
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMainElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMainElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLMainElement: {
-    prototype: HTMLMainElement;
-    new(): HTMLMainElement;
-};
-
-interface HTMLMapElement extends HTMLElement {
-    /**
-     * Retrieves a collection of the area objects defined for the given map object.
-     */
-    readonly areas: HTMLAreasCollection;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    name: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMapElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMapElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLMapElement: {
-    prototype: HTMLMapElement;
-    new(): HTMLMapElement;
-};
-
-interface HTMLMarqueeElementEventMap extends HTMLElementEventMap {
-    "bounce": Event;
-    "finish": Event;
-    "start": Event;
-}
-
-interface HTMLMarqueeElement extends HTMLElement {
-    /** @deprecated */
-    behavior: string;
-    /** @deprecated */
-    bgColor: string;
-    /** @deprecated */
-    direction: string;
-    /** @deprecated */
-    height: string;
-    /** @deprecated */
-    hspace: number;
-    /** @deprecated */
-    loop: number;
-    /** @deprecated */
-    onbounce: ((this: HTMLMarqueeElement, ev: Event) => any) | null;
-    /** @deprecated */
-    onfinish: ((this: HTMLMarqueeElement, ev: Event) => any) | null;
-    /** @deprecated */
-    onstart: ((this: HTMLMarqueeElement, ev: Event) => any) | null;
-    /** @deprecated */
-    scrollAmount: number;
-    /** @deprecated */
-    scrollDelay: number;
-    /** @deprecated */
-    trueSpeed: boolean;
-    /** @deprecated */
-    vspace: number;
-    /** @deprecated */
-    width: string;
-    /** @deprecated */
-    start(): void;
-    /** @deprecated */
-    stop(): void;
-    addEventListener<K extends keyof HTMLMarqueeElementEventMap>(type: K, listener: (this: HTMLMarqueeElement, ev: HTMLMarqueeElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLMarqueeElementEventMap>(type: K, listener: (this: HTMLMarqueeElement, ev: HTMLMarqueeElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLMarqueeElement: {
-    prototype: HTMLMarqueeElement;
-    new(): HTMLMarqueeElement;
-};
-
-interface HTMLMediaElementEventMap extends HTMLElementEventMap {
-    "encrypted": MediaEncryptedEvent;
-    "msneedkey": Event;
-}
-
-interface HTMLMediaElement extends HTMLElement {
-    /**
-     * Returns an AudioTrackList object with the audio tracks for a given video element.
-     */
-    readonly audioTracks: AudioTrackList;
-    /**
-     * Gets or sets a value that indicates whether to start playing the media automatically.
-     */
-    autoplay: boolean;
-    /**
-     * Gets a collection of buffered time ranges.
-     */
-    readonly buffered: TimeRanges;
-    /**
-     * Gets or sets a flag that indicates whether the client provides a set of controls for the media (in case the developer does not include controls for the player).
-     */
-    controls: boolean;
-    crossOrigin: string | null;
-    /**
-     * Gets the address or URL of the current media resource that is selected by IHTMLMediaElement.
-     */
-    readonly currentSrc: string;
-    /**
-     * Gets or sets the current playback position, in seconds.
-     */
-    currentTime: number;
-    defaultMuted: boolean;
-    /**
-     * Gets or sets the default playback rate when the user is not using fast forward or reverse for a video or audio resource.
-     */
-    defaultPlaybackRate: number;
-    /**
-     * Returns the duration in seconds of the current media resource. A NaN value is returned if duration is not available, or Infinity if the media resource is streaming.
-     */
-    readonly duration: number;
-    /**
-     * Gets information about whether the playback has ended or not.
-     */
-    readonly ended: boolean;
-    /**
-     * Returns an object representing the current error state of the audio or video element.
-     */
-    readonly error: MediaError | null;
-    /**
-     * Gets or sets a flag to specify whether playback should restart after it completes.
-     */
-    loop: boolean;
-    readonly mediaKeys: MediaKeys | null;
-    /**
-     * Specifies the purpose of the audio or video media, such as background audio or alerts.
-     */
-    msAudioCategory: string;
-    /**
-     * Specifies the output device id that the audio will be sent to.
-     */
-    msAudioDeviceType: string;
-    readonly msGraphicsTrustStatus: MSGraphicsTrust;
-    /**
-     * Gets the MSMediaKeys object, which is used for decrypting media data, that is associated with this media element.
-     */
-    /** @deprecated */
-    readonly msKeys: MSMediaKeys;
-    /**
-     * Gets or sets whether the DLNA PlayTo device is available.
-     */
-    msPlayToDisabled: boolean;
-    /**
-     * Gets or sets the path to the preferred media source. This enables the Play To target device to stream the media content, which can be DRM protected, from a different location, such as a cloud media server.
-     */
-    msPlayToPreferredSourceUri: string;
-    /**
-     * Gets or sets the primary DLNA PlayTo device.
-     */
-    msPlayToPrimary: boolean;
-    /**
-     * Gets the source associated with the media element for use by the PlayToManager.
-     */
-    readonly msPlayToSource: any;
-    /**
-     * Specifies whether or not to enable low-latency playback on the media element.
-     */
-    msRealTime: boolean;
-    /**
-     * Gets or sets a flag that indicates whether the audio (either audio or the audio track on video media) is muted.
-     */
-    muted: boolean;
-    /**
-     * Gets the current network activity for the element.
-     */
-    readonly networkState: number;
-    onencrypted: ((this: HTMLMediaElement, ev: MediaEncryptedEvent) => any) | null;
-    /** @deprecated */
-    onmsneedkey: ((this: HTMLMediaElement, ev: Event) => any) | null;
-    /**
-     * Gets a flag that specifies whether playback is paused.
-     */
-    readonly paused: boolean;
-    /**
-     * Gets or sets the current rate of speed for the media resource to play. This speed is expressed as a multiple of the normal speed of the media resource.
-     */
-    playbackRate: number;
-    /**
-     * Gets TimeRanges for the current media resource that has been played.
-     */
-    readonly played: TimeRanges;
-    /**
-     * Gets or sets the current playback position, in seconds.
-     */
-    preload: string;
-    readonly readyState: number;
-    /**
-     * Returns a TimeRanges object that represents the ranges of the current media resource that can be seeked.
-     */
-    readonly seekable: TimeRanges;
-    /**
-     * Gets a flag that indicates whether the the client is currently moving to a new playback position in the media resource.
-     */
-    readonly seeking: boolean;
-    /**
-     * The address or URL of the a media resource that is to be considered.
-     */
-    src: string;
-    srcObject: MediaStream | MediaSource | Blob | null;
-    readonly textTracks: TextTrackList;
-    readonly videoTracks: VideoTrackList;
-    /**
-     * Gets or sets the volume level for audio portions of the media element.
-     */
-    volume: number;
-    addTextTrack(kind: TextTrackKind, label?: string, language?: string): TextTrack;
-    /**
-     * Returns a string that specifies whether the client can play a given media resource type.
-     */
-    canPlayType(type: string): CanPlayTypeResult;
-    /**
-     * Resets the audio or video object and loads a new media resource.
-     */
-    load(): void;
-    /**
-     * Clears all effects from the media pipeline.
-     */
-    msClearEffects(): void;
-    msGetAsCastingSource(): any;
-    /**
-     * Inserts the specified audio effect into media pipeline.
-     */
-    msInsertAudioEffect(activatableClassId: string, effectRequired: boolean, config?: any): void;
-    /** @deprecated */
-    msSetMediaKeys(mediaKeys: MSMediaKeys): void;
-    /**
-     * Specifies the media protection manager for a given media pipeline.
-     */
-    msSetMediaProtectionManager(mediaProtectionManager?: any): void;
-    /**
-     * Pauses the current playback and sets paused to TRUE. This can be used to test whether the media is playing or paused. You can also use the pause or play events to tell whether the media is playing or not.
-     */
-    pause(): void;
-    /**
-     * Loads and starts playback of a media resource.
-     */
-    play(): Promise<void>;
-    setMediaKeys(mediaKeys: MediaKeys | null): Promise<void>;
-    readonly HAVE_CURRENT_DATA: number;
-    readonly HAVE_ENOUGH_DATA: number;
-    readonly HAVE_FUTURE_DATA: number;
-    readonly HAVE_METADATA: number;
-    readonly HAVE_NOTHING: number;
-    readonly NETWORK_EMPTY: number;
-    readonly NETWORK_IDLE: number;
-    readonly NETWORK_LOADING: number;
-    readonly NETWORK_NO_SOURCE: number;
-    addEventListener<K extends keyof HTMLMediaElementEventMap>(type: K, listener: (this: HTMLMediaElement, ev: HTMLMediaElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLMediaElementEventMap>(type: K, listener: (this: HTMLMediaElement, ev: HTMLMediaElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLMediaElement: {
-    prototype: HTMLMediaElement;
-    new(): HTMLMediaElement;
-    readonly HAVE_CURRENT_DATA: number;
-    readonly HAVE_ENOUGH_DATA: number;
-    readonly HAVE_FUTURE_DATA: number;
-    readonly HAVE_METADATA: number;
-    readonly HAVE_NOTHING: number;
-    readonly NETWORK_EMPTY: number;
-    readonly NETWORK_IDLE: number;
-    readonly NETWORK_LOADING: number;
-    readonly NETWORK_NO_SOURCE: number;
-};
-
-interface HTMLMenuElement extends HTMLElement {
-    /** @deprecated */
-    compact: boolean;
-    type: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMenuElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMenuElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLMenuElement: {
-    prototype: HTMLMenuElement;
-    new(): HTMLMenuElement;
-};
-
-interface HTMLMetaElement extends HTMLElement {
-    /**
-     * Sets or retrieves the character set used to encode the object.
-     */
-    /** @deprecated */
-    charset: string;
-    /**
-     * Gets or sets meta-information to associate with httpEquiv or name.
-     */
-    content: string;
-    /**
-     * Gets or sets information used to bind the value of a content attribute of a meta element to an HTTP response header.
-     */
-    httpEquiv: string;
-    /**
-     * Sets or retrieves the value specified in the content attribute of the meta object.
-     */
-    name: string;
-    /**
-     * Sets or retrieves a scheme to be used in interpreting the value of a property specified for the object.
-     */
-    /** @deprecated */
-    scheme: string;
-    /**
-     * Sets or retrieves the URL property that will be loaded after the specified time has elapsed.
-     */
-    /** @deprecated */
-    url: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMetaElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMetaElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLMetaElement: {
-    prototype: HTMLMetaElement;
-    new(): HTMLMetaElement;
-};
-
-interface HTMLMeterElement extends HTMLElement {
-    high: number;
-    low: number;
-    max: number;
-    min: number;
-    optimum: number;
-    value: number;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMeterElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMeterElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLMeterElement: {
-    prototype: HTMLMeterElement;
-    new(): HTMLMeterElement;
-};
-
-interface HTMLModElement extends HTMLElement {
-    /**
-     * Sets or retrieves reference information about the object.
-     */
-    cite: string;
-    /**
-     * Sets or retrieves the date and time of a modification to the object.
-     */
-    dateTime: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLModElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLModElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLModElement: {
-    prototype: HTMLModElement;
-    new(): HTMLModElement;
-};
-
-interface HTMLOListElement extends HTMLElement {
-    /** @deprecated */
-    compact: boolean;
-    /**
-     * The starting number.
-     */
-    start: number;
-    type: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLOListElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLOListElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLOListElement: {
-    prototype: HTMLOListElement;
-    new(): HTMLOListElement;
-};
-
-interface HTMLObjectElement extends HTMLElement, GetSVGDocument {
-    /**
-     * Retrieves a string of the URL where the object tag can be found. This is often the href of the document that the object is in, or the value set by a base element.
-     */
-    readonly BaseHref: string;
-    /** @deprecated */
-    align: string;
-    /**
-     * Sets or retrieves a character string that can be used to implement your own archive functionality for the object.
-     */
-    /** @deprecated */
-    archive: string;
-    /** @deprecated */
-    border: string;
-    /**
-     * Sets or retrieves the URL of the file containing the compiled Java class.
-     */
-    /** @deprecated */
-    code: string;
-    /**
-     * Sets or retrieves the URL of the component.
-     */
-    /** @deprecated */
-    codeBase: string;
-    /**
-     * Sets or retrieves the Internet media type for the code associated with the object.
-     */
-    /** @deprecated */
-    codeType: string;
-    /**
-     * Retrieves the document object of the page or frame.
-     */
-    readonly contentDocument: Document | null;
-    /**
-     * Sets or retrieves the URL that references the data of the object.
-     */
-    data: string;
-    /** @deprecated */
-    declare: boolean;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Sets or retrieves the height of the object.
-     */
-    height: string;
-    /** @deprecated */
-    hspace: number;
-    /**
-     * Gets or sets whether the DLNA PlayTo device is available.
-     */
-    msPlayToDisabled: boolean;
-    /**
-     * Gets or sets the path to the preferred media source. This enables the Play To target device to stream the media content, which can be DRM protected, from a different location, such as a cloud media server.
-     */
-    msPlayToPreferredSourceUri: string;
-    /**
-     * Gets or sets the primary DLNA PlayTo device.
-     */
-    msPlayToPrimary: boolean;
-    /**
-     * Gets the source associated with the media element for use by the PlayToManager.
-     */
-    readonly msPlayToSource: any;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    name: string;
-    readonly readyState: number;
-    /**
-     * Sets or retrieves a message to be displayed while an object is loading.
-     */
-    /** @deprecated */
-    standby: string;
-    /**
-     * Sets or retrieves the MIME type of the object.
-     */
-    type: string;
-    typemustmatch: boolean;
-    /**
-     * Sets or retrieves the URL, often with a bookmark extension (#name), to use as a client-side image map.
-     */
-    useMap: string;
-    /**
-     * Returns the error message that would be displayed if the user submits the form, or an empty string if no error message. It also triggers the standard error message, such as "this is a required field". The result is that the user sees validation messages without actually submitting.
-     */
-    readonly validationMessage: string;
-    /**
-     * Returns a  ValidityState object that represents the validity states of an element.
-     */
-    readonly validity: ValidityState;
-    /** @deprecated */
-    vspace: number;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    width: string;
-    /**
-     * Returns whether an element will successfully validate based on forms validation rules and constraints.
-     */
-    readonly willValidate: boolean;
-    /**
-     * Returns whether a form will validate when it is submitted, without having to submit it.
-     */
-    checkValidity(): boolean;
-    /**
-     * Sets a custom error message that is displayed when a form is submitted.
-     * @param error Sets a custom error message that is displayed when a form is submitted.
-     */
-    setCustomValidity(error: string): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLObjectElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLObjectElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLObjectElement: {
-    prototype: HTMLObjectElement;
-    new(): HTMLObjectElement;
-};
-
-interface HTMLOptGroupElement extends HTMLElement {
-    disabled: boolean;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Sets or retrieves a value that you can use to implement your own label functionality for the object.
-     */
-    label: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLOptGroupElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLOptGroupElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLOptGroupElement: {
-    prototype: HTMLOptGroupElement;
-    new(): HTMLOptGroupElement;
-};
-
-interface HTMLOptionElement extends HTMLElement {
-    /**
-     * Sets or retrieves the status of an option.
-     */
-    defaultSelected: boolean;
-    disabled: boolean;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Sets or retrieves the ordinal position of an option in a list box.
-     */
-    readonly index: number;
-    /**
-     * Sets or retrieves a value that you can use to implement your own label functionality for the object.
-     */
-    label: string;
-    /**
-     * Sets or retrieves whether the option in the list box is the default item.
-     */
-    selected: boolean;
-    /**
-     * Sets or retrieves the text string specified by the option tag.
-     */
-    text: string;
-    /**
-     * Sets or retrieves the value which is returned to the server when the form control is submitted.
-     */
-    value: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLOptionElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLOptionElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLOptionElement: {
-    prototype: HTMLOptionElement;
-    new(): HTMLOptionElement;
-};
-
-interface HTMLOptionsCollection extends HTMLCollectionOf<HTMLOptionElement> {
-    length: number;
-    selectedIndex: number;
-    add(element: HTMLOptionElement | HTMLOptGroupElement, before?: HTMLElement | number | null): void;
-    remove(index: number): void;
-}
-
-declare var HTMLOptionsCollection: {
-    prototype: HTMLOptionsCollection;
-    new(): HTMLOptionsCollection;
-};
-
-interface HTMLOutputElement extends HTMLElement {
-    defaultValue: string;
-    readonly form: HTMLFormElement | null;
-    readonly htmlFor: DOMTokenList;
-    name: string;
-    readonly type: string;
-    readonly validationMessage: string;
-    readonly validity: ValidityState;
-    value: string;
-    readonly willValidate: boolean;
-    checkValidity(): boolean;
-    reportValidity(): boolean;
-    setCustomValidity(error: string): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLOutputElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLOutputElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLOutputElement: {
-    prototype: HTMLOutputElement;
-    new(): HTMLOutputElement;
-};
-
-interface HTMLParagraphElement extends HTMLElement {
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    /** @deprecated */
-    align: string;
-    clear: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLParagraphElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLParagraphElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLParagraphElement: {
-    prototype: HTMLParagraphElement;
-    new(): HTMLParagraphElement;
-};
-
-interface HTMLParamElement extends HTMLElement {
-    /**
-     * Sets or retrieves the name of an input parameter for an element.
-     */
-    name: string;
-    /**
-     * Sets or retrieves the content type of the resource designated by the value attribute.
-     */
-    /** @deprecated */
-    type: string;
-    /**
-     * Sets or retrieves the value of an input parameter for an element.
-     */
-    value: string;
-    /**
-     * Sets or retrieves the data type of the value attribute.
-     */
-    /** @deprecated */
-    valueType: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLParamElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLParamElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLParamElement: {
-    prototype: HTMLParamElement;
-    new(): HTMLParamElement;
-};
-
-interface HTMLPictureElement extends HTMLElement {
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLPictureElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLPictureElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLPictureElement: {
-    prototype: HTMLPictureElement;
-    new(): HTMLPictureElement;
-};
-
-interface HTMLPreElement extends HTMLElement {
-    /**
-     * Sets or gets a value that you can use to implement your own width functionality for the object.
-     */
-    /** @deprecated */
-    width: number;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLPreElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLPreElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLPreElement: {
-    prototype: HTMLPreElement;
-    new(): HTMLPreElement;
-};
-
-interface HTMLProgressElement extends HTMLElement {
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Defines the maximum, or "done" value for a progress element.
-     */
-    max: number;
-    /**
-     * Returns the quotient of value/max when the value attribute is set (determinate progress bar), or -1 when the value attribute is missing (indeterminate progress bar).
-     */
-    readonly position: number;
-    /**
-     * Sets or gets the current value of a progress element. The value must be a non-negative number between 0 and the max value.
-     */
-    value: number;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLProgressElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLProgressElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLProgressElement: {
-    prototype: HTMLProgressElement;
-    new(): HTMLProgressElement;
-};
-
-interface HTMLQuoteElement extends HTMLElement {
-    /**
-     * Sets or retrieves reference information about the object.
-     */
-    cite: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLQuoteElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLQuoteElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLQuoteElement: {
-    prototype: HTMLQuoteElement;
-    new(): HTMLQuoteElement;
-};
-
-interface HTMLScriptElement extends HTMLElement {
-    async: boolean;
-    /**
-     * Sets or retrieves the character set used to encode the object.
-     */
-    charset: string;
-    crossOrigin: string | null;
-    /**
-     * Sets or retrieves the status of the script.
-     */
-    defer: boolean;
-    /**
-     * Sets or retrieves the event for which the script is written.
-     */
-    /** @deprecated */
-    event: string;
-    /**
-     * Sets or retrieves the object that is bound to the event script.
-     */
-    /** @deprecated */
-    htmlFor: string;
-    integrity: string;
-    noModule: boolean;
-    /**
-     * Retrieves the URL to an external file that contains the source code or data.
-     */
-    src: string;
-    /**
-     * Retrieves or sets the text of the object as a string.
-     */
-    text: string;
-    /**
-     * Sets or retrieves the MIME type for the associated scripting engine.
-     */
-    type: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLScriptElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLScriptElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLScriptElement: {
-    prototype: HTMLScriptElement;
-    new(): HTMLScriptElement;
-};
-
-interface HTMLSelectElement extends HTMLElement {
-    /**
-     * Provides a way to direct a user to a specific field when a document loads. This can provide both direction and convenience for a user, reducing the need to click or tab to a field when a page opens. This attribute is true when present on an element, and false when missing.
-     */
-    autofocus: boolean;
-    disabled: boolean;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Sets or retrieves the number of objects in a collection.
-     */
-    length: number;
-    /**
-     * Sets or retrieves the Boolean value indicating whether multiple items can be selected from a list.
-     */
-    multiple: boolean;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    name: string;
-    readonly options: HTMLOptionsCollection;
-    /**
-     * When present, marks an element that can't be submitted without a value.
-     */
-    required: boolean;
-    /**
-     * Sets or retrieves the index of the selected option in a select object.
-     */
-    selectedIndex: number;
-    readonly selectedOptions: HTMLCollectionOf<HTMLOptionElement>;
-    /**
-     * Sets or retrieves the number of rows in the list box.
-     */
-    size: number;
-    /**
-     * Retrieves the type of select control based on the value of the MULTIPLE attribute.
-     */
-    readonly type: string;
-    /**
-     * Returns the error message that would be displayed if the user submits the form, or an empty string if no error message. It also triggers the standard error message, such as "this is a required field". The result is that the user sees validation messages without actually submitting.
-     */
-    readonly validationMessage: string;
-    /**
-     * Returns a  ValidityState object that represents the validity states of an element.
-     */
-    readonly validity: ValidityState;
-    /**
-     * Sets or retrieves the value which is returned to the server when the form control is submitted.
-     */
-    value: string;
-    /**
-     * Returns whether an element will successfully validate based on forms validation rules and constraints.
-     */
-    readonly willValidate: boolean;
-    /**
-     * Adds an element to the areas, controlRange, or options collection.
-     * @param element Variant of type Number that specifies the index position in the collection where the element is placed. If no value is given, the method places the element at the end of the collection.
-     * @param before Variant of type Object that specifies an element to insert before, or null to append the object to the collection.
-     */
-    add(element: HTMLOptionElement | HTMLOptGroupElement, before?: HTMLElement | number | null): void;
-    /**
-     * Returns whether a form will validate when it is submitted, without having to submit it.
-     */
-    checkValidity(): boolean;
-    /**
-     * Retrieves a select object or an object from an options collection.
-     * @param name Variant of type Number or String that specifies the object or collection to retrieve. If this parameter is an integer, it is the zero-based index of the object. If this parameter is a string, all objects with matching name or id properties are retrieved, and a collection is returned if more than one match is made.
-     * @param index Variant of type Number that specifies the zero-based index of the object to retrieve when a collection is returned.
-     */
-    item(name?: any, index?: any): Element | null;
-    /**
-     * Retrieves a select object or an object from an options collection.
-     * @param namedItem A String that specifies the name or id property of the object to retrieve. A collection is returned if more than one match is made.
-     */
-    namedItem(name: string): any;
-    /**
-     * Removes an element from the collection.
-     * @param index Number that specifies the zero-based index of the element to remove from the collection.
-     */
-    remove(index?: number): void;
-    /**
-     * Sets a custom error message that is displayed when a form is submitted.
-     * @param error Sets a custom error message that is displayed when a form is submitted.
-     */
-    setCustomValidity(error: string): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSelectElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSelectElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-    [name: string]: any;
-}
-
-declare var HTMLSelectElement: {
-    prototype: HTMLSelectElement;
-    new(): HTMLSelectElement;
-};
-
-interface HTMLSlotElement extends HTMLElement {
-    name: string;
-    assignedNodes(options?: AssignedNodesOptions): Node[];
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSlotElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSlotElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-interface HTMLSourceElement extends HTMLElement {
-    /**
-     * Gets or sets the intended media type of the media source.
-     */
-    media: string;
-    /** @deprecated */
-    msKeySystem: string;
-    sizes: string;
-    /**
-     * The address or URL of the a media resource that is to be considered.
-     */
-    src: string;
-    srcset: string;
-    /**
-     * Gets or sets the MIME type of a media resource.
-     */
-    type: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSourceElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSourceElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLSourceElement: {
-    prototype: HTMLSourceElement;
-    new(): HTMLSourceElement;
-};
-
-interface HTMLSpanElement extends HTMLElement {
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSpanElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSpanElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLSpanElement: {
-    prototype: HTMLSpanElement;
-    new(): HTMLSpanElement;
-};
-
-interface HTMLStyleElement extends HTMLElement, LinkStyle {
-    /** @deprecated */
-    disabled: boolean;
-    /**
-     * Sets or retrieves the media type.
-     */
-    media: string;
-    /**
-     * Retrieves the CSS language in which the style sheet is written.
-     */
-    type: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLStyleElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLStyleElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLStyleElement: {
-    prototype: HTMLStyleElement;
-    new(): HTMLStyleElement;
-};
-
-interface HTMLSummaryElement extends HTMLElement {
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSummaryElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSummaryElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLSummaryElement: {
-    prototype: HTMLSummaryElement;
-    new(): HTMLSummaryElement;
-};
-
-interface HTMLTableCaptionElement extends HTMLElement {
-    /**
-     * Sets or retrieves the alignment of the caption or legend.
-     */
-    /** @deprecated */
-    align: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableCaptionElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableCaptionElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTableCaptionElement: {
-    prototype: HTMLTableCaptionElement;
-    new(): HTMLTableCaptionElement;
-};
-
-interface HTMLTableCellElement extends HTMLElement {
-    /**
-     * Sets or retrieves abbreviated text for the object.
-     */
-    abbr: string;
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    /** @deprecated */
-    align: string;
-    /**
-     * Sets or retrieves a comma-delimited list of conceptual categories associated with the object.
-     */
-    /** @deprecated */
-    axis: string;
-    /** @deprecated */
-    bgColor: string;
-    /**
-     * Retrieves the position of the object in the cells collection of a row.
-     */
-    readonly cellIndex: number;
-    /** @deprecated */
-    ch: string;
-    /** @deprecated */
-    chOff: string;
-    /**
-     * Sets or retrieves the number columns in the table that the object should span.
-     */
-    colSpan: number;
-    /**
-     * Sets or retrieves a list of header cells that provide information for the object.
-     */
-    headers: string;
-    /**
-     * Sets or retrieves the height of the object.
-     */
-    /** @deprecated */
-    height: string;
-    /**
-     * Sets or retrieves whether the browser automatically performs wordwrap.
-     */
-    /** @deprecated */
-    noWrap: boolean;
-    /**
-     * Sets or retrieves how many rows in a table the cell should span.
-     */
-    rowSpan: number;
-    /**
-     * Sets or retrieves the group of cells in a table to which the object's information applies.
-     */
-    scope: string;
-    /** @deprecated */
-    vAlign: string;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    /** @deprecated */
-    width: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableCellElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableCellElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTableCellElement: {
-    prototype: HTMLTableCellElement;
-    new(): HTMLTableCellElement;
-};
-
-interface HTMLTableColElement extends HTMLElement {
-    /**
-     * Sets or retrieves the alignment of the object relative to the display or table.
-     */
-    /** @deprecated */
-    align: string;
-    /** @deprecated */
-    ch: string;
-    /** @deprecated */
-    chOff: string;
-    /**
-     * Sets or retrieves the number of columns in the group.
-     */
-    span: number;
-    /** @deprecated */
-    vAlign: string;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    /** @deprecated */
-    width: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableColElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableColElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTableColElement: {
-    prototype: HTMLTableColElement;
-    new(): HTMLTableColElement;
-};
-
-interface HTMLTableDataCellElement extends HTMLTableCellElement {
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableDataCellElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableDataCellElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTableDataCellElement: {
-    prototype: HTMLTableDataCellElement;
-    new(): HTMLTableDataCellElement;
-};
-
-interface HTMLTableElement extends HTMLElement {
-    /**
-     * Sets or retrieves a value that indicates the table alignment.
-     */
-    /** @deprecated */
-    align: string;
-    /** @deprecated */
-    bgColor: string;
-    /**
-     * Sets or retrieves the width of the border to draw around the object.
-     */
-    /** @deprecated */
-    border: string;
-    /**
-     * Retrieves the caption object of a table.
-     */
-    caption: HTMLTableCaptionElement | null;
-    /**
-     * Sets or retrieves the amount of space between the border of the cell and the content of the cell.
-     */
-    /** @deprecated */
-    cellPadding: string;
-    /**
-     * Sets or retrieves the amount of space between cells in a table.
-     */
-    /** @deprecated */
-    cellSpacing: string;
-    /**
-     * Sets or retrieves the way the border frame around the table is displayed.
-     */
-    /** @deprecated */
-    frame: string;
-    /**
-     * Sets or retrieves the number of horizontal rows contained in the object.
-     */
-    readonly rows: HTMLCollectionOf<HTMLTableRowElement>;
-    /**
-     * Sets or retrieves which dividing lines (inner borders) are displayed.
-     */
-    /** @deprecated */
-    rules: string;
-    /**
-     * Sets or retrieves a description and/or structure of the object.
-     */
-    /** @deprecated */
-    summary: string;
-    /**
-     * Retrieves a collection of all tBody objects in the table. Objects in this collection are in source order.
-     */
-    readonly tBodies: HTMLCollectionOf<HTMLTableSectionElement>;
-    /**
-     * Retrieves the tFoot object of the table.
-     */
-    tFoot: HTMLTableSectionElement | null;
-    /**
-     * Retrieves the tHead object of the table.
-     */
-    tHead: HTMLTableSectionElement | null;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    /** @deprecated */
-    width: string;
-    /**
-     * Creates an empty caption element in the table.
-     */
-    createCaption(): HTMLTableCaptionElement;
-    /**
-     * Creates an empty tBody element in the table.
-     */
-    createTBody(): HTMLTableSectionElement;
-    /**
-     * Creates an empty tFoot element in the table.
-     */
-    createTFoot(): HTMLTableSectionElement;
-    /**
-     * Returns the tHead element object if successful, or null otherwise.
-     */
-    createTHead(): HTMLTableSectionElement;
-    /**
-     * Deletes the caption element and its contents from the table.
-     */
-    deleteCaption(): void;
-    /**
-     * Removes the specified row (tr) from the element and from the rows collection.
-     * @param index Number that specifies the zero-based position in the rows collection of the row to remove.
-     */
-    deleteRow(index?: number): void;
-    /**
-     * Deletes the tFoot element and its contents from the table.
-     */
-    deleteTFoot(): void;
-    /**
-     * Deletes the tHead element and its contents from the table.
-     */
-    deleteTHead(): void;
-    /**
-     * Creates a new row (tr) in the table, and adds the row to the rows collection.
-     * @param index Number that specifies where to insert the row in the rows collection. The default value is -1, which appends the new row to the end of the rows collection.
-     */
-    insertRow(index?: number): HTMLTableRowElement;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTableElement: {
-    prototype: HTMLTableElement;
-    new(): HTMLTableElement;
-};
-
-interface HTMLTableHeaderCellElement extends HTMLTableCellElement {
-    scope: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableHeaderCellElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableHeaderCellElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTableHeaderCellElement: {
-    prototype: HTMLTableHeaderCellElement;
-    new(): HTMLTableHeaderCellElement;
-};
-
-interface HTMLTableRowElement extends HTMLElement {
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    /** @deprecated */
-    align: string;
-    /** @deprecated */
-    bgColor: string;
-    /**
-     * Retrieves a collection of all cells in the table row.
-     */
-    readonly cells: HTMLCollectionOf<HTMLTableDataCellElement | HTMLTableHeaderCellElement>;
-    /** @deprecated */
-    ch: string;
-    /** @deprecated */
-    chOff: string;
-    /**
-     * Retrieves the position of the object in the rows collection for the table.
-     */
-    readonly rowIndex: number;
-    /**
-     * Retrieves the position of the object in the collection.
-     */
-    readonly sectionRowIndex: number;
-    /** @deprecated */
-    vAlign: string;
-    /**
-     * Removes the specified cell from the table row, as well as from the cells collection.
-     * @param index Number that specifies the zero-based position of the cell to remove from the table row. If no value is provided, the last cell in the cells collection is deleted.
-     */
-    deleteCell(index?: number): void;
-    /**
-     * Creates a new cell in the table row, and adds the cell to the cells collection.
-     * @param index Number that specifies where to insert the cell in the tr. The default value is -1, which appends the new cell to the end of the cells collection.
-     */
-    insertCell(index?: number): HTMLTableDataCellElement;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableRowElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableRowElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTableRowElement: {
-    prototype: HTMLTableRowElement;
-    new(): HTMLTableRowElement;
-};
-
-interface HTMLTableSectionElement extends HTMLElement {
-    /**
-     * Sets or retrieves a value that indicates the table alignment.
-     */
-    /** @deprecated */
-    align: string;
-    /** @deprecated */
-    ch: string;
-    /** @deprecated */
-    chOff: string;
-    /**
-     * Sets or retrieves the number of horizontal rows contained in the object.
-     */
-    readonly rows: HTMLCollectionOf<HTMLTableRowElement>;
-    /** @deprecated */
-    vAlign: string;
-    /**
-     * Removes the specified row (tr) from the element and from the rows collection.
-     * @param index Number that specifies the zero-based position in the rows collection of the row to remove.
-     */
-    deleteRow(index?: number): void;
-    /**
-     * Creates a new row (tr) in the table, and adds the row to the rows collection.
-     * @param index Number that specifies where to insert the row in the rows collection. The default value is -1, which appends the new row to the end of the rows collection.
-     */
-    insertRow(index?: number): HTMLTableRowElement;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableSectionElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableSectionElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTableSectionElement: {
-    prototype: HTMLTableSectionElement;
-    new(): HTMLTableSectionElement;
-};
-
-interface HTMLTemplateElement extends HTMLElement {
-    readonly content: DocumentFragment;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTemplateElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTemplateElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTemplateElement: {
-    prototype: HTMLTemplateElement;
-    new(): HTMLTemplateElement;
-};
-
-interface HTMLTextAreaElement extends HTMLElement {
-    /**
-     * Provides a way to direct a user to a specific field when a document loads. This can provide both direction and convenience for a user, reducing the need to click or tab to a field when a page opens. This attribute is true when present on an element, and false when missing.
-     */
-    autofocus: boolean;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    cols: number;
-    /**
-     * Sets or retrieves the initial contents of the object.
-     */
-    defaultValue: string;
-    disabled: boolean;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Sets or retrieves the maximum number of characters that the user can enter in a text control.
-     */
-    maxLength: number;
-    minLength: number;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    name: string;
-    /**
-     * Gets or sets a text string that is displayed in an input field as a hint or prompt to users as the format or type of information they need to enter.The text appears in an input field until the user puts focus on the field.
-     */
-    placeholder: string;
-    /**
-     * Sets or retrieves the value indicated whether the content of the object is read-only.
-     */
-    readOnly: boolean;
-    /**
-     * When present, marks an element that can't be submitted without a value.
-     */
-    required: boolean;
-    /**
-     * Sets or retrieves the number of horizontal rows contained in the object.
-     */
-    rows: number;
-    /**
-     * Gets or sets the end position or offset of a text selection.
-     */
-    selectionEnd: number;
-    /**
-     * Gets or sets the starting position or offset of a text selection.
-     */
-    selectionStart: number;
-    /**
-     * Retrieves the type of control.
-     */
-    readonly type: string;
-    /**
-     * Returns the error message that would be displayed if the user submits the form, or an empty string if no error message. It also triggers the standard error message, such as "this is a required field". The result is that the user sees validation messages without actually submitting.
-     */
-    readonly validationMessage: string;
-    /**
-     * Returns a  ValidityState object that represents the validity states of an element.
-     */
-    readonly validity: ValidityState;
-    /**
-     * Retrieves or sets the text in the entry field of the textArea element.
-     */
-    value: string;
-    /**
-     * Returns whether an element will successfully validate based on forms validation rules and constraints.
-     */
-    readonly willValidate: boolean;
-    /**
-     * Sets or retrieves how to handle wordwrapping in the object.
-     */
-    wrap: string;
-    /**
-     * Returns whether a form will validate when it is submitted, without having to submit it.
-     */
-    checkValidity(): boolean;
-    /**
-     * Highlights the input area of a form element.
-     */
-    select(): void;
-    /**
-     * Sets a custom error message that is displayed when a form is submitted.
-     * @param error Sets a custom error message that is displayed when a form is submitted.
-     */
-    setCustomValidity(error: string): void;
-    /**
-     * Sets the start and end positions of a selection in a text field.
-     * @param start The offset into the text field for the start of the selection.
-     * @param end The offset into the text field for the end of the selection.
-     * @param direction The direction in which the selection is performed.
-     */
-    setSelectionRange(start: number, end: number, direction?: "forward" | "backward" | "none"): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTextAreaElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTextAreaElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTextAreaElement: {
-    prototype: HTMLTextAreaElement;
-    new(): HTMLTextAreaElement;
-};
-
-interface HTMLTimeElement extends HTMLElement {
-    dateTime: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTimeElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTimeElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTimeElement: {
-    prototype: HTMLTimeElement;
-    new(): HTMLTimeElement;
-};
-
-interface HTMLTitleElement extends HTMLElement {
-    /**
-     * Retrieves or sets the text of the object as a string.
-     */
-    text: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTitleElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTitleElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTitleElement: {
-    prototype: HTMLTitleElement;
-    new(): HTMLTitleElement;
-};
-
-interface HTMLTrackElement extends HTMLElement {
-    default: boolean;
-    kind: string;
-    label: string;
-    readonly readyState: number;
-    src: string;
-    srclang: string;
-    readonly track: TextTrack;
-    readonly ERROR: number;
-    readonly LOADED: number;
-    readonly LOADING: number;
-    readonly NONE: number;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTrackElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTrackElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTrackElement: {
-    prototype: HTMLTrackElement;
-    new(): HTMLTrackElement;
-    readonly ERROR: number;
-    readonly LOADED: number;
-    readonly LOADING: number;
-    readonly NONE: number;
-};
-
-interface HTMLUListElement extends HTMLElement {
-    /** @deprecated */
-    compact: boolean;
-    /** @deprecated */
-    type: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLUListElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLUListElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLUListElement: {
-    prototype: HTMLUListElement;
-    new(): HTMLUListElement;
-};
-
-interface HTMLUnknownElement extends HTMLElement {
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLUnknownElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLUnknownElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLUnknownElement: {
-    prototype: HTMLUnknownElement;
-    new(): HTMLUnknownElement;
-};
-
-interface HTMLVideoElementEventMap extends HTMLMediaElementEventMap {
-    "MSVideoFormatChanged": Event;
-    "MSVideoFrameStepCompleted": Event;
-    "MSVideoOptimalLayoutChanged": Event;
-}
-
-interface HTMLVideoElement extends HTMLMediaElement {
-    /**
-     * Gets or sets the height of the video element.
-     */
-    height: number;
-    msHorizontalMirror: boolean;
-    readonly msIsLayoutOptimalForPlayback: boolean;
-    readonly msIsStereo3D: boolean;
-    msStereo3DPackingMode: string;
-    msStereo3DRenderMode: string;
-    msZoom: boolean;
-    onMSVideoFormatChanged: ((this: HTMLVideoElement, ev: Event) => any) | null;
-    onMSVideoFrameStepCompleted: ((this: HTMLVideoElement, ev: Event) => any) | null;
-    onMSVideoOptimalLayoutChanged: ((this: HTMLVideoElement, ev: Event) => any) | null;
-    /**
-     * Gets or sets a URL of an image to display, for example, like a movie poster. This can be a still frame from the video, or another image if no video data is available.
-     */
-    poster: string;
-    /**
-     * Gets the intrinsic height of a video in CSS pixels, or zero if the dimensions are not known.
-     */
-    readonly videoHeight: number;
-    /**
-     * Gets the intrinsic width of a video in CSS pixels, or zero if the dimensions are not known.
-     */
-    readonly videoWidth: number;
-    readonly webkitDisplayingFullscreen: boolean;
-    readonly webkitSupportsFullscreen: boolean;
-    /**
-     * Gets or sets the width of the video element.
-     */
-    width: number;
-    getVideoPlaybackQuality(): VideoPlaybackQuality;
-    msFrameStep(forward: boolean): void;
-    msInsertVideoEffect(activatableClassId: string, effectRequired: boolean, config?: any): void;
-    msSetVideoRectangle(left: number, top: number, right: number, bottom: number): void;
-    webkitEnterFullScreen(): void;
-    webkitEnterFullscreen(): void;
-    webkitExitFullScreen(): void;
-    webkitExitFullscreen(): void;
-    addEventListener<K extends keyof HTMLVideoElementEventMap>(type: K, listener: (this: HTMLVideoElement, ev: HTMLVideoElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLVideoElementEventMap>(type: K, listener: (this: HTMLVideoElement, ev: HTMLVideoElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLVideoElement: {
-    prototype: HTMLVideoElement;
-    new(): HTMLVideoElement;
-};
-
-interface HTMLegendElement {
-    readonly form: HTMLFormElement | null;
-}
-
-declare var HTMLegendElement: {
-    prototype: HTMLegendElement;
-    new(): HTMLegendElement;
-};
-
-interface HashChangeEvent extends Event {
-    readonly newURL: string;
-    readonly oldURL: string;
-}
-
-declare var HashChangeEvent: {
-    prototype: HashChangeEvent;
-    new(type: string, eventInitDict?: HashChangeEventInit): HashChangeEvent;
-};
-
-interface Headers {
-    append(name: string, value: string): void;
-    delete(name: string): void;
-    forEach(callback: Function, thisArg?: any): void;
-    get(name: string): string | null;
-    has(name: string): boolean;
-    set(name: string, value: string): void;
-}
-
-declare var Headers: {
-    prototype: Headers;
-    new(init?: HeadersInit): Headers;
-};
-
-interface History {
-    readonly length: number;
-    scrollRestoration: ScrollRestoration;
-    readonly state: any;
-    back(distance?: any): void;
-    forward(distance?: any): void;
-    go(delta?: any): void;
-    pushState(data: any, title?: string, url?: string | null): void;
-    replaceState(data: any, title?: string, url?: string | null): void;
-}
-
-declare var History: {
-    prototype: History;
-    new(): History;
-};
-
-interface HkdfCtrParams extends Algorithm {
-    context: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer;
-    hash: string | Algorithm;
-    label: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer;
-}
-
-interface IDBArrayKey extends Array<number | string | Date | IDBArrayKey> {
-}
-
-interface IDBCursor {
-    readonly direction: IDBCursorDirection;
-    readonly key: IDBKeyRange | number | string | Date | IDBArrayKey;
-    readonly primaryKey: any;
-    readonly source: IDBObjectStore | IDBIndex;
-    advance(count: number): void;
-    continue(key?: IDBKeyRange | number | string | Date | IDBArrayKey): void;
-    delete(): IDBRequest;
-    update(value: any): IDBRequest;
-    readonly NEXT: string;
-    readonly NEXT_NO_DUPLICATE: string;
-    readonly PREV: string;
-    readonly PREV_NO_DUPLICATE: string;
-}
-
-declare var IDBCursor: {
-    prototype: IDBCursor;
-    new(): IDBCursor;
-    readonly NEXT: string;
-    readonly NEXT_NO_DUPLICATE: string;
-    readonly PREV: string;
-    readonly PREV_NO_DUPLICATE: string;
-};
-
-interface IDBCursorWithValue extends IDBCursor {
-    readonly value: any;
-}
-
-declare var IDBCursorWithValue: {
-    prototype: IDBCursorWithValue;
-    new(): IDBCursorWithValue;
-};
-
-interface IDBDatabaseEventMap {
-    "abort": Event;
-    "error": Event;
-}
-
-interface IDBDatabase extends EventTarget {
-    readonly name: string;
-    readonly objectStoreNames: DOMStringList;
-    onabort: ((this: IDBDatabase, ev: Event) => any) | null;
-    onerror: ((this: IDBDatabase, ev: Event) => any) | null;
-    onversionchange: ((this: IDBDatabase, ev: Event) => any) | null;
-    readonly version: number;
-    close(): void;
-    createObjectStore(name: string, optionalParameters?: IDBObjectStoreParameters): IDBObjectStore;
-    deleteObjectStore(name: string): void;
-    transaction(storeNames: string | string[], mode?: IDBTransactionMode): IDBTransaction;
-    addEventListener<K extends keyof IDBDatabaseEventMap>(type: K, listener: (this: IDBDatabase, ev: IDBDatabaseEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof IDBDatabaseEventMap>(type: K, listener: (this: IDBDatabase, ev: IDBDatabaseEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var IDBDatabase: {
-    prototype: IDBDatabase;
-    new(): IDBDatabase;
-};
-
-interface IDBEnvironment {
-    readonly indexedDB: IDBFactory;
-}
-
-interface IDBFactory {
-    cmp(first: any, second: any): number;
-    deleteDatabase(name: string): IDBOpenDBRequest;
-    open(name: string, version?: number): IDBOpenDBRequest;
-}
-
-declare var IDBFactory: {
-    prototype: IDBFactory;
-    new(): IDBFactory;
-};
-
-interface IDBIndex {
-    readonly keyPath: string | string[];
-    multiEntry: boolean;
-    readonly name: string;
-    readonly objectStore: IDBObjectStore;
-    readonly unique: boolean;
-    count(key?: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-    get(key: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-    getKey(key: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-    openCursor(range?: IDBKeyRange | number | string | Date | IDBArrayKey, direction?: IDBCursorDirection): IDBRequest;
-    openKeyCursor(range?: IDBKeyRange | number | string | Date | IDBArrayKey, direction?: IDBCursorDirection): IDBRequest;
-}
-
-declare var IDBIndex: {
-    prototype: IDBIndex;
-    new(): IDBIndex;
-};
-
-interface IDBKeyRange {
-    readonly lower: any;
-    readonly lowerOpen: boolean;
-    readonly upper: any;
-    readonly upperOpen: boolean;
-}
-
-declare var IDBKeyRange: {
-    prototype: IDBKeyRange;
-    new(): IDBKeyRange;
-    bound(lower: any, upper: any, lowerOpen?: boolean, upperOpen?: boolean): IDBKeyRange;
-    lowerBound(lower: any, open?: boolean): IDBKeyRange;
-    only(value: any): IDBKeyRange;
-    upperBound(upper: any, open?: boolean): IDBKeyRange;
-};
-
-interface IDBObjectStore {
-    autoIncrement: boolean;
-    readonly indexNames: DOMStringList;
-    readonly keyPath: string | string[] | null;
-    readonly name: string;
-    readonly transaction: IDBTransaction;
-    add(value: any, key?: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-    clear(): IDBRequest;
-    count(key?: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-    createIndex(name: string, keyPath: string | string[], optionalParameters?: IDBIndexParameters): IDBIndex;
-    delete(key: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-    deleteIndex(indexName: string): void;
-    get(key: any): IDBRequest;
-    index(name: string): IDBIndex;
-    openCursor(range?: IDBKeyRange | number | string | Date | IDBArrayKey, direction?: IDBCursorDirection): IDBRequest;
-    put(value: any, key?: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-}
-
-declare var IDBObjectStore: {
-    prototype: IDBObjectStore;
-    new(): IDBObjectStore;
-};
-
-interface IDBOpenDBRequestEventMap extends IDBRequestEventMap {
-    "blocked": Event;
-    "upgradeneeded": IDBVersionChangeEvent;
-}
-
-interface IDBOpenDBRequest extends IDBRequest {
-    onblocked: ((this: IDBOpenDBRequest, ev: Event) => any) | null;
-    onupgradeneeded: ((this: IDBOpenDBRequest, ev: IDBVersionChangeEvent) => any) | null;
-    addEventListener<K extends keyof IDBOpenDBRequestEventMap>(type: K, listener: (this: IDBOpenDBRequest, ev: IDBOpenDBRequestEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof IDBOpenDBRequestEventMap>(type: K, listener: (this: IDBOpenDBRequest, ev: IDBOpenDBRequestEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var IDBOpenDBRequest: {
-    prototype: IDBOpenDBRequest;
-    new(): IDBOpenDBRequest;
-};
-
-interface IDBRequestEventMap {
-    "error": Event;
-    "success": Event;
-}
-
-interface IDBRequest extends EventTarget {
-    readonly error: DOMException;
-    onerror: ((this: IDBRequest, ev: Event) => any) | null;
-    onsuccess: ((this: IDBRequest, ev: Event) => any) | null;
-    readonly readyState: IDBRequestReadyState;
-    readonly result: any;
-    readonly source: IDBObjectStore | IDBIndex | IDBCursor;
-    readonly transaction: IDBTransaction;
-    addEventListener<K extends keyof IDBRequestEventMap>(type: K, listener: (this: IDBRequest, ev: IDBRequestEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof IDBRequestEventMap>(type: K, listener: (this: IDBRequest, ev: IDBRequestEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var IDBRequest: {
-    prototype: IDBRequest;
-    new(): IDBRequest;
-};
-
-interface IDBTransactionEventMap {
-    "abort": Event;
-    "complete": Event;
-    "error": Event;
-}
-
-interface IDBTransaction extends EventTarget {
-    readonly db: IDBDatabase;
-    readonly error: DOMException;
-    readonly mode: IDBTransactionMode;
-    onabort: ((this: IDBTransaction, ev: Event) => any) | null;
-    oncomplete: ((this: IDBTransaction, ev: Event) => any) | null;
-    onerror: ((this: IDBTransaction, ev: Event) => any) | null;
-    abort(): void;
-    objectStore(name: string): IDBObjectStore;
-    readonly READ_ONLY: string;
-    readonly READ_WRITE: string;
-    readonly VERSION_CHANGE: string;
-    addEventListener<K extends keyof IDBTransactionEventMap>(type: K, listener: (this: IDBTransaction, ev: IDBTransactionEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof IDBTransactionEventMap>(type: K, listener: (this: IDBTransaction, ev: IDBTransactionEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var IDBTransaction: {
-    prototype: IDBTransaction;
-    new(): IDBTransaction;
-    readonly READ_ONLY: string;
-    readonly READ_WRITE: string;
-    readonly VERSION_CHANGE: string;
-};
-
-interface IDBVersionChangeEvent extends Event {
-    readonly newVersion: number | null;
-    readonly oldVersion: number;
-}
-
-declare var IDBVersionChangeEvent: {
-    prototype: IDBVersionChangeEvent;
-    new(): IDBVersionChangeEvent;
-};
-
-interface IIRFilterNode extends AudioNode {
-    getFrequencyResponse(frequencyHz: Float32Array, magResponse: Float32Array, phaseResponse: Float32Array): void;
-}
-
-declare var IIRFilterNode: {
-    prototype: IIRFilterNode;
-    new(): IIRFilterNode;
-};
-
-interface ImageBitmap {
-    readonly height: number;
-    readonly width: number;
-    close(): void;
-}
-
-interface ImageBitmapOptions {
-    colorSpaceConversion?: "none" | "default";
-    imageOrientation?: "none" | "flipY";
-    premultiplyAlpha?: "none" | "premultiply" | "default";
-    resizeHeight?: number;
-    resizeQuality?: "pixelated" | "low" | "medium" | "high";
-    resizeWidth?: number;
-}
-
-interface ImageData {
-    readonly data: Uint8ClampedArray;
-    readonly height: number;
-    readonly width: number;
-}
-
-declare var ImageData: {
-    prototype: ImageData;
-    new(width: number, height: number): ImageData;
-    new(array: Uint8ClampedArray, width: number, height: number): ImageData;
-};
-
-interface IntersectionObserver {
-    readonly root: Element | null;
-    readonly rootMargin: string;
-    readonly thresholds: number[];
-    disconnect(): void;
-    observe(target: Element): void;
-    takeRecords(): IntersectionObserverEntry[];
-    unobserve(target: Element): void;
-}
-
-declare var IntersectionObserver: {
-    prototype: IntersectionObserver;
-    new(callback: IntersectionObserverCallback, options?: IntersectionObserverInit): IntersectionObserver;
-};
-
-interface IntersectionObserverEntry {
-    readonly boundingClientRect: ClientRect | DOMRect;
-    readonly intersectionRatio: number;
-    readonly intersectionRect: ClientRect | DOMRect;
-    readonly isIntersecting: boolean;
-    readonly rootBounds: ClientRect | DOMRect;
-    readonly target: Element;
-    readonly time: number;
-}
-
-declare var IntersectionObserverEntry: {
-    prototype: IntersectionObserverEntry;
-    new(intersectionObserverEntryInit: IntersectionObserverEntryInit): IntersectionObserverEntry;
-};
-
-interface KeyboardEvent extends UIEvent {
-    readonly altKey: boolean;
-    /** @deprecated */
-    char: string;
-    /** @deprecated */
-    readonly charCode: number;
-    readonly code: string;
-    readonly ctrlKey: boolean;
-    readonly key: string;
-    /** @deprecated */
-    readonly keyCode: number;
-    readonly location: number;
-    readonly metaKey: boolean;
-    readonly repeat: boolean;
-    readonly shiftKey: boolean;
-    /** @deprecated */
-    readonly which: number;
-    getModifierState(keyArg: string): boolean;
-    /** @deprecated */
-    initKeyboardEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, keyArg: string, locationArg: number, modifiersListArg: string, repeat: boolean, locale: string): void;
-    readonly DOM_KEY_LOCATION_JOYSTICK: number;
-    readonly DOM_KEY_LOCATION_LEFT: number;
-    readonly DOM_KEY_LOCATION_MOBILE: number;
-    readonly DOM_KEY_LOCATION_NUMPAD: number;
-    readonly DOM_KEY_LOCATION_RIGHT: number;
-    readonly DOM_KEY_LOCATION_STANDARD: number;
-}
-
-declare var KeyboardEvent: {
-    prototype: KeyboardEvent;
-    new(typeArg: string, eventInitDict?: KeyboardEventInit): KeyboardEvent;
-    readonly DOM_KEY_LOCATION_JOYSTICK: number;
-    readonly DOM_KEY_LOCATION_LEFT: number;
-    readonly DOM_KEY_LOCATION_MOBILE: number;
-    readonly DOM_KEY_LOCATION_NUMPAD: number;
-    readonly DOM_KEY_LOCATION_RIGHT: number;
-    readonly DOM_KEY_LOCATION_STANDARD: number;
-};
-
-interface LinkStyle {
-    readonly sheet: StyleSheet | null;
-}
-
-interface ListeningStateChangedEvent extends Event {
-    readonly label: string;
-    readonly state: ListeningState;
-}
-
-declare var ListeningStateChangedEvent: {
-    prototype: ListeningStateChangedEvent;
-    new(): ListeningStateChangedEvent;
-};
-
-interface Location {
-    hash: string;
-    host: string;
-    hostname: string;
-    href: string;
-    readonly origin: string;
-    pathname: string;
-    port: string;
-    protocol: string;
-    search: string;
-    assign(url: string): void;
-    reload(forcedReload?: boolean): void;
-    replace(url: string): void;
-    toString(): string;
-}
-
-declare var Location: {
-    prototype: Location;
-    new(): Location;
-};
-
-interface MSAssertion {
-    readonly id: string;
-    readonly type: MSCredentialType;
-}
-
-declare var MSAssertion: {
-    prototype: MSAssertion;
-    new(): MSAssertion;
-};
-
-interface MSBlobBuilder {
-    append(data: any, endings?: string): void;
-    getBlob(contentType?: string): Blob;
-}
-
-declare var MSBlobBuilder: {
-    prototype: MSBlobBuilder;
-    new(): MSBlobBuilder;
-};
-
-interface MSCredentials {
-    getAssertion(challenge: string, filter?: MSCredentialFilter, params?: MSSignatureParameters): Promise<MSAssertion>;
-    makeCredential(accountInfo: MSAccountInfo, params: MSCredentialParameters[], challenge?: string): Promise<MSAssertion>;
-}
-
-declare var MSCredentials: {
-    prototype: MSCredentials;
-    new(): MSCredentials;
-};
-
-interface MSDCCEvent extends Event {
-    readonly maxFr: number;
-    readonly maxFs: number;
-}
-
-declare var MSDCCEvent: {
-    prototype: MSDCCEvent;
-    new(type: string, eventInitDict: MSDCCEventInit): MSDCCEvent;
-};
-
-interface MSDSHEvent extends Event {
-    readonly sources: number[];
-    readonly timestamp: number;
-}
-
-declare var MSDSHEvent: {
-    prototype: MSDSHEvent;
-    new(type: string, eventInitDict: MSDSHEventInit): MSDSHEvent;
-};
-
-interface MSFIDOCredentialAssertion extends MSAssertion {
-    readonly algorithm: string | Algorithm;
-    readonly attestation: any;
-    readonly publicKey: string;
-    readonly transportHints: MSTransportType[];
-}
-
-declare var MSFIDOCredentialAssertion: {
-    prototype: MSFIDOCredentialAssertion;
-    new(): MSFIDOCredentialAssertion;
-};
-
-interface MSFIDOSignature {
-    readonly authnrData: string;
-    readonly clientData: string;
-    readonly signature: string;
-}
-
-declare var MSFIDOSignature: {
-    prototype: MSFIDOSignature;
-    new(): MSFIDOSignature;
-};
-
-interface MSFIDOSignatureAssertion extends MSAssertion {
-    readonly signature: MSFIDOSignature;
-}
-
-declare var MSFIDOSignatureAssertion: {
-    prototype: MSFIDOSignatureAssertion;
-    new(): MSFIDOSignatureAssertion;
-};
-
-interface MSFileSaver {
-    msSaveBlob(blob: any, defaultName?: string): boolean;
-    msSaveOrOpenBlob(blob: any, defaultName?: string): boolean;
-}
-
-interface MSGesture {
-    target: Element;
-    addPointer(pointerId: number): void;
-    stop(): void;
-}
-
-declare var MSGesture: {
-    prototype: MSGesture;
-    new(): MSGesture;
-};
-
-interface MSGestureEvent extends UIEvent {
-    readonly clientX: number;
-    readonly clientY: number;
-    readonly expansion: number;
-    readonly gestureObject: any;
-    readonly hwTimestamp: number;
-    readonly offsetX: number;
-    readonly offsetY: number;
-    readonly rotation: number;
-    readonly scale: number;
-    readonly screenX: number;
-    readonly screenY: number;
-    readonly translationX: number;
-    readonly translationY: number;
-    readonly velocityAngular: number;
-    readonly velocityExpansion: number;
-    readonly velocityX: number;
-    readonly velocityY: number;
-    initGestureEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number, screenXArg: number, screenYArg: number, clientXArg: number, clientYArg: number, offsetXArg: number, offsetYArg: number, translationXArg: number, translationYArg: number, scaleArg: number, expansionArg: number, rotationArg: number, velocityXArg: number, velocityYArg: number, velocityExpansionArg: number, velocityAngularArg: number, hwTimestampArg: number): void;
-    readonly MSGESTURE_FLAG_BEGIN: number;
-    readonly MSGESTURE_FLAG_CANCEL: number;
-    readonly MSGESTURE_FLAG_END: number;
-    readonly MSGESTURE_FLAG_INERTIA: number;
-    readonly MSGESTURE_FLAG_NONE: number;
-}
-
-declare var MSGestureEvent: {
-    prototype: MSGestureEvent;
-    new(): MSGestureEvent;
-    readonly MSGESTURE_FLAG_BEGIN: number;
-    readonly MSGESTURE_FLAG_CANCEL: number;
-    readonly MSGESTURE_FLAG_END: number;
-    readonly MSGESTURE_FLAG_INERTIA: number;
-    readonly MSGESTURE_FLAG_NONE: number;
-};
-
-interface MSGraphicsTrust {
-    readonly constrictionActive: boolean;
-    readonly status: string;
-}
-
-declare var MSGraphicsTrust: {
-    prototype: MSGraphicsTrust;
-    new(): MSGraphicsTrust;
-};
-
-interface MSInputMethodContextEventMap {
-    "MSCandidateWindowHide": Event;
-    "MSCandidateWindowShow": Event;
-    "MSCandidateWindowUpdate": Event;
-}
-
-interface MSInputMethodContext extends EventTarget {
-    readonly compositionEndOffset: number;
-    readonly compositionStartOffset: number;
-    oncandidatewindowhide: ((this: MSInputMethodContext, ev: Event) => any) | null;
-    oncandidatewindowshow: ((this: MSInputMethodContext, ev: Event) => any) | null;
-    oncandidatewindowupdate: ((this: MSInputMethodContext, ev: Event) => any) | null;
-    readonly target: HTMLElement;
-    getCandidateWindowClientRect(): ClientRect;
-    getCompositionAlternatives(): string[];
-    hasComposition(): boolean;
-    isCandidateWindowVisible(): boolean;
-    addEventListener<K extends keyof MSInputMethodContextEventMap>(type: K, listener: (this: MSInputMethodContext, ev: MSInputMethodContextEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof MSInputMethodContextEventMap>(type: K, listener: (this: MSInputMethodContext, ev: MSInputMethodContextEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var MSInputMethodContext: {
-    prototype: MSInputMethodContext;
-    new(): MSInputMethodContext;
-};
-
-interface MSMediaKeyError {
-    readonly code: number;
-    readonly systemCode: number;
-    readonly MS_MEDIA_KEYERR_CLIENT: number;
-    readonly MS_MEDIA_KEYERR_DOMAIN: number;
-    readonly MS_MEDIA_KEYERR_HARDWARECHANGE: number;
-    readonly MS_MEDIA_KEYERR_OUTPUT: number;
-    readonly MS_MEDIA_KEYERR_SERVICE: number;
-    readonly MS_MEDIA_KEYERR_UNKNOWN: number;
-}
-
-declare var MSMediaKeyError: {
-    prototype: MSMediaKeyError;
-    new(): MSMediaKeyError;
-    readonly MS_MEDIA_KEYERR_CLIENT: number;
-    readonly MS_MEDIA_KEYERR_DOMAIN: number;
-    readonly MS_MEDIA_KEYERR_HARDWARECHANGE: number;
-    readonly MS_MEDIA_KEYERR_OUTPUT: number;
-    readonly MS_MEDIA_KEYERR_SERVICE: number;
-    readonly MS_MEDIA_KEYERR_UNKNOWN: number;
-};
-
-interface MSMediaKeyMessageEvent extends Event {
-    readonly destinationURL: string | null;
-    readonly message: Uint8Array;
-}
-
-declare var MSMediaKeyMessageEvent: {
-    prototype: MSMediaKeyMessageEvent;
-    new(): MSMediaKeyMessageEvent;
-};
-
-interface MSMediaKeyNeededEvent extends Event {
-    readonly initData: Uint8Array | null;
-}
-
-declare var MSMediaKeyNeededEvent: {
-    prototype: MSMediaKeyNeededEvent;
-    new(): MSMediaKeyNeededEvent;
-};
-
-interface MSMediaKeySession extends EventTarget {
-    readonly error: MSMediaKeyError | null;
-    readonly keySystem: string;
-    readonly sessionId: string;
-    close(): void;
-    update(key: Uint8Array): void;
-}
-
-declare var MSMediaKeySession: {
-    prototype: MSMediaKeySession;
-    new(): MSMediaKeySession;
-};
-
-interface MSMediaKeys {
-    readonly keySystem: string;
-    createSession(type: string, initData: Uint8Array, cdmData?: Uint8Array | null): MSMediaKeySession;
-}
-
-declare var MSMediaKeys: {
-    prototype: MSMediaKeys;
-    new(keySystem: string): MSMediaKeys;
-    isTypeSupported(keySystem: string, type?: string | null): boolean;
-    isTypeSupportedWithFeatures(keySystem: string, type?: string | null): string;
-};
-
-interface MSNavigatorDoNotTrack {
-    confirmSiteSpecificTrackingException(args: ConfirmSiteSpecificExceptionsInformation): boolean;
-    confirmWebWideTrackingException(args: ExceptionInformation): boolean;
-    removeSiteSpecificTrackingException(args: ExceptionInformation): void;
-    removeWebWideTrackingException(args: ExceptionInformation): void;
-    storeSiteSpecificTrackingException(args: StoreSiteSpecificExceptionsInformation): void;
-    storeWebWideTrackingException(args: StoreExceptionsInformation): void;
-}
-
-interface MSPointerEvent extends MouseEvent {
-    readonly currentPoint: any;
-    readonly height: number;
-    readonly hwTimestamp: number;
-    readonly intermediatePoints: any;
-    readonly isPrimary: boolean;
-    readonly pointerId: number;
-    readonly pointerType: any;
-    readonly pressure: number;
-    readonly rotation: number;
-    readonly tiltX: number;
-    readonly tiltY: number;
-    readonly width: number;
-    getCurrentPoint(element: Element): void;
-    getIntermediatePoints(element: Element): void;
-    initPointerEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number, screenXArg: number, screenYArg: number, clientXArg: number, clientYArg: number, ctrlKeyArg: boolean, altKeyArg: boolean, shiftKeyArg: boolean, metaKeyArg: boolean, buttonArg: number, relatedTargetArg: EventTarget, offsetXArg: number, offsetYArg: number, widthArg: number, heightArg: number, pressure: number, rotation: number, tiltX: number, tiltY: number, pointerIdArg: number, pointerType: any, hwTimestampArg: number, isPrimary: boolean): void;
-}
-
-declare var MSPointerEvent: {
-    prototype: MSPointerEvent;
-    new(typeArg: string, eventInitDict?: PointerEventInit): MSPointerEvent;
-};
-
-interface MSStream {
-    readonly type: string;
-    msClose(): void;
-    msDetachStream(): any;
-}
-
-declare var MSStream: {
-    prototype: MSStream;
-    new(): MSStream;
-};
-
-interface MSStreamReaderEventMap {
-    "abort": UIEvent;
-    "error": ErrorEvent;
-    "load": Event;
-    "loadend": ProgressEvent;
-    "loadstart": Event;
-    "progress": ProgressEvent;
-}
-
-interface MSStreamReader extends EventTarget {
-    readonly error: DOMError;
-    onabort: ((this: MSStreamReader, ev: UIEvent) => any) | null;
-    onerror: ((this: MSStreamReader, ev: ErrorEvent) => any) | null;
-    onload: ((this: MSStreamReader, ev: Event) => any) | null;
-    onloadend: ((this: MSStreamReader, ev: ProgressEvent) => any) | null;
-    onloadstart: ((this: MSStreamReader, ev: Event) => any) | null;
-    onprogress: ((this: MSStreamReader, ev: ProgressEvent) => any) | null;
-    readonly readyState: number;
-    readonly result: any;
-    abort(): void;
-    readAsArrayBuffer(stream: MSStream, size?: number): void;
-    readAsBinaryString(stream: MSStream, size?: number): void;
-    readAsBlob(stream: MSStream, size?: number): void;
-    readAsDataURL(stream: MSStream, size?: number): void;
-    readAsText(stream: MSStream, encoding?: string, size?: number): void;
-    readonly DONE: number;
-    readonly EMPTY: number;
-    readonly LOADING: number;
-    addEventListener<K extends keyof MSStreamReaderEventMap>(type: K, listener: (this: MSStreamReader, ev: MSStreamReaderEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof MSStreamReaderEventMap>(type: K, listener: (this: MSStreamReader, ev: MSStreamReaderEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var MSStreamReader: {
-    prototype: MSStreamReader;
-    new(): MSStreamReader;
-    readonly DONE: number;
-    readonly EMPTY: number;
-    readonly LOADING: number;
-};
-
-interface MediaDeviceInfo {
-    readonly deviceId: string;
-    readonly groupId: string;
-    readonly kind: MediaDeviceKind;
-    readonly label: string;
-}
-
-declare var MediaDeviceInfo: {
-    prototype: MediaDeviceInfo;
-    new(): MediaDeviceInfo;
-};
-
-interface MediaDevicesEventMap {
-    "devicechange": Event;
-}
-
-interface MediaDevices extends EventTarget {
-    ondevicechange: ((this: MediaDevices, ev: Event) => any) | null;
-    enumerateDevices(): Promise<MediaDeviceInfo[]>;
-    getSupportedConstraints(): MediaTrackSupportedConstraints;
-    getUserMedia(constraints: MediaStreamConstraints): Promise<MediaStream>;
-    addEventListener<K extends keyof MediaDevicesEventMap>(type: K, listener: (this: MediaDevices, ev: MediaDevicesEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof MediaDevicesEventMap>(type: K, listener: (this: MediaDevices, ev: MediaDevicesEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var MediaDevices: {
-    prototype: MediaDevices;
-    new(): MediaDevices;
-};
-
-interface MediaElementAudioSourceNode extends AudioNode {
-}
-
-declare var MediaElementAudioSourceNode: {
-    prototype: MediaElementAudioSourceNode;
-    new(): MediaElementAudioSourceNode;
-};
-
-interface MediaEncryptedEvent extends Event {
-    readonly initData: ArrayBuffer | null;
-    readonly initDataType: string;
-}
-
-declare var MediaEncryptedEvent: {
-    prototype: MediaEncryptedEvent;
-    new(type: string, eventInitDict?: MediaEncryptedEventInit): MediaEncryptedEvent;
-};
-
-interface MediaError {
-    readonly code: number;
-    readonly message: string;
-    readonly msExtendedCode: number;
-    readonly MEDIA_ERR_ABORTED: number;
-    readonly MEDIA_ERR_DECODE: number;
-    readonly MEDIA_ERR_NETWORK: number;
-    readonly MEDIA_ERR_SRC_NOT_SUPPORTED: number;
-    readonly MS_MEDIA_ERR_ENCRYPTED: number;
-}
-
-declare var MediaError: {
-    prototype: MediaError;
-    new(): MediaError;
-    readonly MEDIA_ERR_ABORTED: number;
-    readonly MEDIA_ERR_DECODE: number;
-    readonly MEDIA_ERR_NETWORK: number;
-    readonly MEDIA_ERR_SRC_NOT_SUPPORTED: number;
-    readonly MS_MEDIA_ERR_ENCRYPTED: number;
-};
-
-interface MediaKeyMessageEvent extends Event {
-    readonly message: ArrayBuffer;
-    readonly messageType: MediaKeyMessageType;
-}
-
-declare var MediaKeyMessageEvent: {
-    prototype: MediaKeyMessageEvent;
-    new(type: string, eventInitDict?: MediaKeyMessageEventInit): MediaKeyMessageEvent;
-};
-
-interface MediaKeySession extends EventTarget {
-    readonly closed: Promise<void>;
-    readonly expiration: number;
-    readonly keyStatuses: MediaKeyStatusMap;
-    readonly sessionId: string;
-    close(): Promise<void>;
-    generateRequest(initDataType: string, initData: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null): Promise<void>;
-    load(sessionId: string): Promise<boolean>;
-    remove(): Promise<void>;
-    update(response: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null): Promise<void>;
-}
-
-declare var MediaKeySession: {
-    prototype: MediaKeySession;
-    new(): MediaKeySession;
-};
-
-interface MediaKeyStatusMap {
-    readonly size: number;
-    forEach(callback: Function, thisArg?: any): void;
-    get(keyId: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null): MediaKeyStatus;
-    has(keyId: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null): boolean;
-}
-
-declare var MediaKeyStatusMap: {
-    prototype: MediaKeyStatusMap;
-    new(): MediaKeyStatusMap;
-};
-
-interface MediaKeySystemAccess {
-    readonly keySystem: string;
-    createMediaKeys(): Promise<MediaKeys>;
-    getConfiguration(): MediaKeySystemConfiguration;
-}
-
-declare var MediaKeySystemAccess: {
-    prototype: MediaKeySystemAccess;
-    new(): MediaKeySystemAccess;
-};
-
-interface MediaKeys {
-    createSession(sessionType?: MediaKeySessionType): MediaKeySession;
-    setServerCertificate(serverCertificate: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null): Promise<void>;
-}
-
-declare var MediaKeys: {
-    prototype: MediaKeys;
-    new(): MediaKeys;
-};
-
-interface MediaList {
-    readonly length: number;
-    mediaText: string;
-    appendMedium(medium: string): void;
-    deleteMedium(medium: string): void;
-    item(index: number): string | null;
-    toString(): number;
-    [index: number]: string;
-}
-
-declare var MediaList: {
-    prototype: MediaList;
-    new(): MediaList;
-};
-
-interface MediaQueryList {
-    readonly matches: boolean;
-    readonly media: string;
-    addListener(listener: MediaQueryListListener): void;
-    removeListener(listener: MediaQueryListListener): void;
-}
-
-declare var MediaQueryList: {
-    prototype: MediaQueryList;
-    new(): MediaQueryList;
-};
-
-interface MediaSource extends EventTarget {
-    readonly activeSourceBuffers: SourceBufferList;
-    duration: number;
-    readonly readyState: string;
-    readonly sourceBuffers: SourceBufferList;
-    addSourceBuffer(type: string): SourceBuffer;
-    endOfStream(error?: number): void;
-    removeSourceBuffer(sourceBuffer: SourceBuffer): void;
-}
-
-declare var MediaSource: {
-    prototype: MediaSource;
-    new(): MediaSource;
-    isTypeSupported(type: string): boolean;
-};
-
-interface MediaStreamEventMap {
-    "active": Event;
-    "addtrack": MediaStreamTrackEvent;
-    "inactive": Event;
-    "removetrack": MediaStreamTrackEvent;
-}
-
-interface MediaStream extends EventTarget {
-    readonly active: boolean;
-    readonly id: string;
-    onactive: ((this: MediaStream, ev: Event) => any) | null;
-    onaddtrack: ((this: MediaStream, ev: MediaStreamTrackEvent) => any) | null;
-    oninactive: ((this: MediaStream, ev: Event) => any) | null;
-    onremovetrack: ((this: MediaStream, ev: MediaStreamTrackEvent) => any) | null;
-    addTrack(track: MediaStreamTrack): void;
-    clone(): MediaStream;
-    getAudioTracks(): MediaStreamTrack[];
-    getTrackById(trackId: string): MediaStreamTrack | null;
-    getTracks(): MediaStreamTrack[];
-    getVideoTracks(): MediaStreamTrack[];
-    removeTrack(track: MediaStreamTrack): void;
-    stop(): void;
-    addEventListener<K extends keyof MediaStreamEventMap>(type: K, listener: (this: MediaStream, ev: MediaStreamEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof MediaStreamEventMap>(type: K, listener: (this: MediaStream, ev: MediaStreamEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var MediaStream: {
-    prototype: MediaStream;
-    new(): MediaStream;
-    new(stream: MediaStream): MediaStream;
-    new(tracks: MediaStreamTrack[]): MediaStream;
-};
-
-interface MediaStreamAudioSourceNode extends AudioNode {
-}
-
-declare var MediaStreamAudioSourceNode: {
-    prototype: MediaStreamAudioSourceNode;
-    new(): MediaStreamAudioSourceNode;
-};
-
-interface MediaStreamError {
-    readonly constraintName: string | null;
-    readonly message: string | null;
-    readonly name: string;
-}
-
-declare var MediaStreamError: {
-    prototype: MediaStreamError;
-    new(): MediaStreamError;
-};
-
-interface MediaStreamErrorEvent extends Event {
-    readonly error: MediaStreamError | null;
-}
-
-declare var MediaStreamErrorEvent: {
-    prototype: MediaStreamErrorEvent;
-    new(typeArg: string, eventInitDict?: MediaStreamErrorEventInit): MediaStreamErrorEvent;
-};
-
-interface MediaStreamEvent extends Event {
-    readonly stream: MediaStream | null;
-}
-
-declare var MediaStreamEvent: {
-    prototype: MediaStreamEvent;
-    new(type: string, eventInitDict: MediaStreamEventInit): MediaStreamEvent;
-};
-
-interface MediaStreamTrackEventMap {
-    "ended": MediaStreamErrorEvent;
-    "mute": Event;
-    "overconstrained": MediaStreamErrorEvent;
-    "unmute": Event;
-}
-
-interface MediaStreamTrack extends EventTarget {
-    enabled: boolean;
-    readonly id: string;
-    readonly kind: string;
-    readonly label: string;
-    readonly muted: boolean;
-    onended: ((this: MediaStreamTrack, ev: MediaStreamErrorEvent) => any) | null;
-    onmute: ((this: MediaStreamTrack, ev: Event) => any) | null;
-    onoverconstrained: ((this: MediaStreamTrack, ev: MediaStreamErrorEvent) => any) | null;
-    onunmute: ((this: MediaStreamTrack, ev: Event) => any) | null;
-    readonly readonly: boolean;
-    readonly readyState: MediaStreamTrackState;
-    readonly remote: boolean;
-    applyConstraints(constraints: MediaTrackConstraints): Promise<void>;
-    clone(): MediaStreamTrack;
-    getCapabilities(): MediaTrackCapabilities;
-    getConstraints(): MediaTrackConstraints;
-    getSettings(): MediaTrackSettings;
-    stop(): void;
-    addEventListener<K extends keyof MediaStreamTrackEventMap>(type: K, listener: (this: MediaStreamTrack, ev: MediaStreamTrackEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof MediaStreamTrackEventMap>(type: K, listener: (this: MediaStreamTrack, ev: MediaStreamTrackEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var MediaStreamTrack: {
-    prototype: MediaStreamTrack;
-    new(): MediaStreamTrack;
-};
-
-interface MediaStreamTrackEvent extends Event {
-    readonly track: MediaStreamTrack;
-}
-
-declare var MediaStreamTrackEvent: {
-    prototype: MediaStreamTrackEvent;
-    new(typeArg: string, eventInitDict?: MediaStreamTrackEventInit): MediaStreamTrackEvent;
-};
-
-interface MessageChannel {
-    readonly port1: MessagePort;
-    readonly port2: MessagePort;
-}
-
-declare var MessageChannel: {
-    prototype: MessageChannel;
-    new(): MessageChannel;
-};
-
-interface MessageEvent extends Event {
-    readonly data: any;
-    readonly origin: string;
-    readonly ports: ReadonlyArray<MessagePort>;
-    readonly source: Window | null;
-    initMessageEvent(type: string, bubbles: boolean, cancelable: boolean, data: any, origin: string, lastEventId: string, source: Window): void;
-}
-
-declare var MessageEvent: {
-    prototype: MessageEvent;
-    new(type: string, eventInitDict?: MessageEventInit): MessageEvent;
-};
-
-interface MessagePortEventMap {
-    "message": MessageEvent;
-}
-
-interface MessagePort extends EventTarget {
-    onmessage: ((this: MessagePort, ev: MessageEvent) => any) | null;
-    close(): void;
-    postMessage(message?: any, transfer?: any[]): void;
-    start(): void;
-    addEventListener<K extends keyof MessagePortEventMap>(type: K, listener: (this: MessagePort, ev: MessagePortEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof MessagePortEventMap>(type: K, listener: (this: MessagePort, ev: MessagePortEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var MessagePort: {
-    prototype: MessagePort;
-    new(): MessagePort;
-};
-
-interface MimeType {
-    readonly description: string;
-    readonly enabledPlugin: Plugin;
-    readonly suffixes: string;
-    readonly type: string;
-}
-
-declare var MimeType: {
-    prototype: MimeType;
-    new(): MimeType;
-};
-
-interface MimeTypeArray {
-    readonly length: number;
-    item(index: number): Plugin;
-    namedItem(type: string): Plugin;
-    [index: number]: Plugin;
-}
-
-declare var MimeTypeArray: {
-    prototype: MimeTypeArray;
-    new(): MimeTypeArray;
-};
-
-interface MouseEvent extends UIEvent {
-    readonly altKey: boolean;
-    readonly button: number;
-    readonly buttons: number;
-    readonly clientX: number;
-    readonly clientY: number;
-    readonly ctrlKey: boolean;
-    /** @deprecated */
-    readonly fromElement: Element;
-    readonly layerX: number;
-    readonly layerY: number;
-    readonly metaKey: boolean;
-    readonly movementX: number;
-    readonly movementY: number;
-    readonly offsetX: number;
-    readonly offsetY: number;
-    readonly pageX: number;
-    readonly pageY: number;
-    readonly relatedTarget: EventTarget;
-    readonly screenX: number;
-    readonly screenY: number;
-    readonly shiftKey: boolean;
-    /** @deprecated */
-    readonly toElement: Element;
-    /** @deprecated */
-    readonly which: number;
-    readonly x: number;
-    readonly y: number;
-    getModifierState(keyArg: string): boolean;
-    initMouseEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number, screenXArg: number, screenYArg: number, clientXArg: number, clientYArg: number, ctrlKeyArg: boolean, altKeyArg: boolean, shiftKeyArg: boolean, metaKeyArg: boolean, buttonArg: number, relatedTargetArg: EventTarget | null): void;
-}
-
-declare var MouseEvent: {
-    prototype: MouseEvent;
-    new(typeArg: string, eventInitDict?: MouseEventInit): MouseEvent;
-};
-
-interface MutationEvent extends Event {
-    readonly attrChange: number;
-    readonly attrName: string;
-    readonly newValue: string;
-    readonly prevValue: string;
-    readonly relatedNode: Node;
-    initMutationEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, relatedNodeArg: Node, prevValueArg: string, newValueArg: string, attrNameArg: string, attrChangeArg: number): void;
-    readonly ADDITION: number;
-    readonly MODIFICATION: number;
-    readonly REMOVAL: number;
-}
-
-declare var MutationEvent: {
-    prototype: MutationEvent;
-    new(): MutationEvent;
-    readonly ADDITION: number;
-    readonly MODIFICATION: number;
-    readonly REMOVAL: number;
-};
-
-interface MutationObserver {
-    disconnect(): void;
-    observe(target: Node, options: MutationObserverInit): void;
-    takeRecords(): MutationRecord[];
-}
-
-declare var MutationObserver: {
-    prototype: MutationObserver;
-    new(callback: MutationCallback): MutationObserver;
-};
-
-interface MutationRecord {
-    readonly addedNodes: NodeList;
-    readonly attributeName: string | null;
-    readonly attributeNamespace: string | null;
-    readonly nextSibling: Node | null;
-    readonly oldValue: string | null;
-    readonly previousSibling: Node | null;
-    readonly removedNodes: NodeList;
-    readonly target: Node;
-    readonly type: MutationRecordType;
-}
-
-declare var MutationRecord: {
-    prototype: MutationRecord;
-    new(): MutationRecord;
-};
-
-interface NamedNodeMap {
-    readonly length: number;
-    getNamedItem(qualifiedName: string): Attr | null;
-    getNamedItemNS(namespace: string | null, localName: string): Attr | null;
-    item(index: number): Attr | null;
-    removeNamedItem(qualifiedName: string): Attr;
-    removeNamedItemNS(namespace: string | null, localName: string): Attr;
-    setNamedItem(attr: Attr): Attr | null;
-    setNamedItemNS(attr: Attr): Attr | null;
-    [index: number]: Attr;
-}
-
-declare var NamedNodeMap: {
-    prototype: NamedNodeMap;
-    new(): NamedNodeMap;
-};
-
-interface Navigator extends NavigatorID, NavigatorOnLine, NavigatorContentUtils, NavigatorStorageUtils, MSNavigatorDoNotTrack, MSFileSaver, NavigatorBeacon, NavigatorConcurrentHardware, NavigatorUserMedia, NavigatorLanguage {
-    readonly activeVRDisplays: ReadonlyArray<VRDisplay>;
-    readonly authentication: WebAuthentication;
-    readonly cookieEnabled: boolean;
-    readonly doNotTrack: string | null;
-    gamepadInputEmulation: GamepadInputEmulationType;
-    readonly geolocation: Geolocation;
-    readonly maxTouchPoints: number;
-    readonly mimeTypes: MimeTypeArray;
-    readonly msManipulationViewsEnabled: boolean;
-    readonly msMaxTouchPoints: number;
-    readonly msPointerEnabled: boolean;
-    readonly plugins: PluginArray;
-    readonly pointerEnabled: boolean;
-    readonly serviceWorker: ServiceWorkerContainer;
-    readonly webdriver: boolean;
-    getGamepads(): (Gamepad | null)[];
-    getVRDisplays(): Promise<VRDisplay[]>;
-    javaEnabled(): boolean;
-    msLaunchUri(uri: string, successCallback?: MSLaunchUriCallback, noHandlerCallback?: MSLaunchUriCallback): void;
-    requestMediaKeySystemAccess(keySystem: string, supportedConfigurations: MediaKeySystemConfiguration[]): Promise<MediaKeySystemAccess>;
-    vibrate(pattern: number | number[]): boolean;
-}
-
-declare var Navigator: {
-    prototype: Navigator;
-    new(): Navigator;
-};
-
-interface NavigatorBeacon {
-    sendBeacon(url: string, data?: Blob | Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | FormData | string | null): boolean;
-}
-
-interface NavigatorConcurrentHardware {
-    readonly hardwareConcurrency: number;
-}
-
-interface NavigatorContentUtils {
-}
-
-interface NavigatorID {
-    readonly appCodeName: string;
-    readonly appName: string;
-    readonly appVersion: string;
-    readonly platform: string;
-    readonly product: string;
-    readonly productSub: string;
-    readonly userAgent: string;
-    readonly vendor: string;
-    readonly vendorSub: string;
-}
-
-interface NavigatorLanguage {
-    readonly language: string;
-    readonly languages: ReadonlyArray<string>;
-}
-
-interface NavigatorOnLine {
-    readonly onLine: boolean;
-}
-
-interface NavigatorStorageUtils {
-}
-
-interface NavigatorUserMedia {
-    readonly mediaDevices: MediaDevices;
-    getDisplayMedia(constraints: MediaStreamConstraints): Promise<MediaStream>;
-    getUserMedia(constraints: MediaStreamConstraints, successCallback: NavigatorUserMediaSuccessCallback, errorCallback: NavigatorUserMediaErrorCallback): void;
-}
-
-interface Node extends EventTarget {
-    readonly baseURI: string | null;
-    readonly childNodes: NodeListOf<Node & ChildNode>;
-    readonly firstChild: Node | null;
-    readonly isConnected: boolean;
-    readonly lastChild: Node | null;
-    readonly localName: string | null;
-    readonly namespaceURI: string | null;
-    readonly nextSibling: Node | null;
-    readonly nodeName: string;
-    readonly nodeType: number;
-    nodeValue: string | null;
-    readonly ownerDocument: Document;
-    readonly parentElement: HTMLElement | null;
-    readonly parentNode: Node | null;
-    readonly previousSibling: Node | null;
-    textContent: string | null;
-    appendChild<T extends Node>(newChild: T): T;
-    cloneNode(deep?: boolean): Node;
-    compareDocumentPosition(other: Node): number;
-    contains(child: Node): boolean;
-    hasChildNodes(): boolean;
-    insertBefore<T extends Node>(newChild: T, refChild: Node | null): T;
-    isDefaultNamespace(namespaceURI: string | null): boolean;
-    isEqualNode(arg: Node): boolean;
-    isSameNode(other: Node): boolean;
-    lookupNamespaceURI(prefix: string | null): string | null;
-    lookupPrefix(namespaceURI: string | null): string | null;
-    normalize(): void;
-    removeChild<T extends Node>(oldChild: T): T;
-    replaceChild<T extends Node>(newChild: Node, oldChild: T): T;
-    readonly ATTRIBUTE_NODE: number;
-    readonly CDATA_SECTION_NODE: number;
-    readonly COMMENT_NODE: number;
-    readonly DOCUMENT_FRAGMENT_NODE: number;
-    readonly DOCUMENT_NODE: number;
-    readonly DOCUMENT_POSITION_CONTAINED_BY: number;
-    readonly DOCUMENT_POSITION_CONTAINS: number;
-    readonly DOCUMENT_POSITION_DISCONNECTED: number;
-    readonly DOCUMENT_POSITION_FOLLOWING: number;
-    readonly DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC: number;
-    readonly DOCUMENT_POSITION_PRECEDING: number;
-    readonly DOCUMENT_TYPE_NODE: number;
-    readonly ELEMENT_NODE: number;
-    readonly ENTITY_NODE: number;
-    readonly ENTITY_REFERENCE_NODE: number;
-    readonly NOTATION_NODE: number;
-    readonly PROCESSING_INSTRUCTION_NODE: number;
-    readonly TEXT_NODE: number;
-}
-
-declare var Node: {
-    prototype: Node;
-    new(): Node;
-    readonly ATTRIBUTE_NODE: number;
-    readonly CDATA_SECTION_NODE: number;
-    readonly COMMENT_NODE: number;
-    readonly DOCUMENT_FRAGMENT_NODE: number;
-    readonly DOCUMENT_NODE: number;
-    readonly DOCUMENT_POSITION_CONTAINED_BY: number;
-    readonly DOCUMENT_POSITION_CONTAINS: number;
-    readonly DOCUMENT_POSITION_DISCONNECTED: number;
-    readonly DOCUMENT_POSITION_FOLLOWING: number;
-    readonly DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC: number;
-    readonly DOCUMENT_POSITION_PRECEDING: number;
-    readonly DOCUMENT_TYPE_NODE: number;
-    readonly ELEMENT_NODE: number;
-    readonly ENTITY_NODE: number;
-    readonly ENTITY_REFERENCE_NODE: number;
-    readonly NOTATION_NODE: number;
-    readonly PROCESSING_INSTRUCTION_NODE: number;
-    readonly TEXT_NODE: number;
-};
-
-interface NodeFilter {
-    acceptNode(node: Node): number;
-}
-
-declare var NodeFilter: {
-    readonly FILTER_ACCEPT: number;
-    readonly FILTER_REJECT: number;
-    readonly FILTER_SKIP: number;
-    readonly SHOW_ALL: number;
-    readonly SHOW_ATTRIBUTE: number;
-    readonly SHOW_CDATA_SECTION: number;
-    readonly SHOW_COMMENT: number;
-    readonly SHOW_DOCUMENT: number;
-    readonly SHOW_DOCUMENT_FRAGMENT: number;
-    readonly SHOW_DOCUMENT_TYPE: number;
-    readonly SHOW_ELEMENT: number;
-    readonly SHOW_ENTITY: number;
-    readonly SHOW_ENTITY_REFERENCE: number;
-    readonly SHOW_NOTATION: number;
-    readonly SHOW_PROCESSING_INSTRUCTION: number;
-    readonly SHOW_TEXT: number;
-};
-
-interface NodeIterator {
-    /** @deprecated */
-    readonly expandEntityReferences: boolean;
-    readonly filter: NodeFilter | null;
-    readonly root: Node;
-    readonly whatToShow: number;
-    detach(): void;
-    nextNode(): Node | null;
-    previousNode(): Node | null;
-}
-
-declare var NodeIterator: {
-    prototype: NodeIterator;
-    new(): NodeIterator;
-};
-
-interface NodeList {
-    readonly length: number;
-    item(index: number): Node;
-    [index: number]: Node;
-}
-
-declare var NodeList: {
-    prototype: NodeList;
-    new(): NodeList;
-};
-
-interface NodeListOf<TNode extends Node> extends NodeList {
-    length: number;
-    item(index: number): TNode;
-    [index: number]: TNode;
-}
-
-interface NodeSelector {
-    querySelector<K extends keyof HTMLElementTagNameMap>(selectors: K): HTMLElementTagNameMap[K] | null;
-    querySelector<K extends keyof SVGElementTagNameMap>(selectors: K): SVGElementTagNameMap[K] | null;
-    querySelector<E extends Element = Element>(selectors: string): E | null;
-    querySelectorAll<K extends keyof HTMLElementTagNameMap>(selectors: K): NodeListOf<HTMLElementTagNameMap[K]>;
-    querySelectorAll<K extends keyof SVGElementTagNameMap>(selectors: K): NodeListOf<SVGElementTagNameMap[K]>;
-    querySelectorAll<E extends Element = Element>(selectors: string): NodeListOf<E>;
-}
-
-interface NotificationEventMap {
-    "click": Event;
-    "close": Event;
-    "error": Event;
-    "show": Event;
-}
-
-interface Notification extends EventTarget {
-    readonly body: string | null;
-    readonly data: any;
-    readonly dir: NotificationDirection;
-    readonly icon: string | null;
-    readonly lang: string | null;
-    onclick: ((this: Notification, ev: Event) => any) | null;
-    onclose: ((this: Notification, ev: Event) => any) | null;
-    onerror: ((this: Notification, ev: Event) => any) | null;
-    onshow: ((this: Notification, ev: Event) => any) | null;
-    readonly permission: NotificationPermission;
-    readonly tag: string | null;
-    readonly title: string;
-    close(): void;
-    addEventListener<K extends keyof NotificationEventMap>(type: K, listener: (this: Notification, ev: NotificationEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof NotificationEventMap>(type: K, listener: (this: Notification, ev: NotificationEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var Notification: {
-    prototype: Notification;
-    new(title: string, options?: NotificationOptions): Notification;
-    requestPermission(callback?: NotificationPermissionCallback): Promise<NotificationPermission>;
-};
-
-interface OES_element_index_uint {
-}
-
-declare var OES_element_index_uint: {
-    prototype: OES_element_index_uint;
-    new(): OES_element_index_uint;
-};
-
-interface OES_standard_derivatives {
-    readonly FRAGMENT_SHADER_DERIVATIVE_HINT_OES: number;
-}
-
-declare var OES_standard_derivatives: {
-    prototype: OES_standard_derivatives;
-    new(): OES_standard_derivatives;
-    readonly FRAGMENT_SHADER_DERIVATIVE_HINT_OES: number;
-};
-
-interface OES_texture_float {
-}
-
-declare var OES_texture_float: {
-    prototype: OES_texture_float;
-    new(): OES_texture_float;
-};
-
-interface OES_texture_float_linear {
-}
-
-declare var OES_texture_float_linear: {
-    prototype: OES_texture_float_linear;
-    new(): OES_texture_float_linear;
-};
-
-interface OES_texture_half_float {
-    readonly HALF_FLOAT_OES: number;
-}
-
-declare var OES_texture_half_float: {
-    prototype: OES_texture_half_float;
-    new(): OES_texture_half_float;
-    readonly HALF_FLOAT_OES: number;
-};
-
-interface OES_texture_half_float_linear {
-}
-
-declare var OES_texture_half_float_linear: {
-    prototype: OES_texture_half_float_linear;
-    new(): OES_texture_half_float_linear;
-};
-
-interface OES_vertex_array_object {
-    readonly VERTEX_ARRAY_BINDING_OES: number;
-    bindVertexArrayOES(arrayObject: WebGLVertexArrayObjectOES): void;
-    createVertexArrayOES(): WebGLVertexArrayObjectOES;
-    deleteVertexArrayOES(arrayObject: WebGLVertexArrayObjectOES): void;
-    isVertexArrayOES(value: any): value is WebGLVertexArrayObjectOES;
-}
-
-interface OfflineAudioCompletionEvent extends Event {
-    readonly renderedBuffer: AudioBuffer;
-}
-
-declare var OfflineAudioCompletionEvent: {
-    prototype: OfflineAudioCompletionEvent;
-    new(): OfflineAudioCompletionEvent;
-};
-
-interface OfflineAudioContextEventMap extends AudioContextEventMap {
-    "complete": OfflineAudioCompletionEvent;
-}
-
-interface OfflineAudioContext extends AudioContextBase {
-    readonly length: number;
-    oncomplete: ((this: OfflineAudioContext, ev: OfflineAudioCompletionEvent) => any) | null;
-    startRendering(): Promise<AudioBuffer>;
-    suspend(suspendTime: number): Promise<void>;
-    addEventListener<K extends keyof OfflineAudioContextEventMap>(type: K, listener: (this: OfflineAudioContext, ev: OfflineAudioContextEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof OfflineAudioContextEventMap>(type: K, listener: (this: OfflineAudioContext, ev: OfflineAudioContextEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var OfflineAudioContext: {
-    prototype: OfflineAudioContext;
-    new(numberOfChannels: number, length: number, sampleRate: number): OfflineAudioContext;
-};
-
-interface OscillatorNodeEventMap {
-    "ended": Event;
-}
-
-interface OscillatorNode extends AudioNode {
-    readonly detune: AudioParam;
-    readonly frequency: AudioParam;
-    onended: ((this: OscillatorNode, ev: Event) => any) | null;
-    type: OscillatorType;
-    setPeriodicWave(periodicWave: PeriodicWave): void;
-    start(when?: number): void;
-    stop(when?: number): void;
-    addEventListener<K extends keyof OscillatorNodeEventMap>(type: K, listener: (this: OscillatorNode, ev: OscillatorNodeEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof OscillatorNodeEventMap>(type: K, listener: (this: OscillatorNode, ev: OscillatorNodeEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var OscillatorNode: {
-    prototype: OscillatorNode;
-    new(): OscillatorNode;
-};
-
-interface OverflowEvent extends UIEvent {
-    readonly horizontalOverflow: boolean;
-    readonly orient: number;
-    readonly verticalOverflow: boolean;
-    readonly BOTH: number;
-    readonly HORIZONTAL: number;
-    readonly VERTICAL: number;
-}
-
-declare var OverflowEvent: {
-    prototype: OverflowEvent;
-    new(): OverflowEvent;
-    readonly BOTH: number;
-    readonly HORIZONTAL: number;
-    readonly VERTICAL: number;
-};
-
-interface PageTransitionEvent extends Event {
-    readonly persisted: boolean;
-}
-
-declare var PageTransitionEvent: {
-    prototype: PageTransitionEvent;
-    new(): PageTransitionEvent;
-};
-
-interface PannerNode extends AudioNode {
-    coneInnerAngle: number;
-    coneOuterAngle: number;
-    coneOuterGain: number;
-    distanceModel: DistanceModelType;
-    maxDistance: number;
-    panningModel: PanningModelType;
-    refDistance: number;
-    rolloffFactor: number;
-    /** @deprecated */
-    setOrientation(x: number, y: number, z: number): void;
-    /** @deprecated */
-    setPosition(x: number, y: number, z: number): void;
-    /** @deprecated */
-    setVelocity(x: number, y: number, z: number): void;
-}
-
-declare var PannerNode: {
-    prototype: PannerNode;
-    new(): PannerNode;
-};
-
-interface ParentNode {
-    readonly childElementCount: number;
-    readonly firstElementChild: Element | null;
-    readonly lastElementChild: Element | null;
-}
-
-interface ParentNode {
-    readonly children: HTMLCollection;
-    querySelector<K extends keyof HTMLElementTagNameMap>(selectors: K): HTMLElementTagNameMap[K] | null;
-    querySelector<K extends keyof SVGElementTagNameMap>(selectors: K): SVGElementTagNameMap[K] | null;
-    querySelector<E extends Element = Element>(selectors: string): E | null;
-    querySelectorAll<K extends keyof HTMLElementTagNameMap>(selectors: K): NodeListOf<HTMLElementTagNameMap[K]>;
-    querySelectorAll<K extends keyof SVGElementTagNameMap>(selectors: K): NodeListOf<SVGElementTagNameMap[K]>;
-    querySelectorAll<E extends Element = Element>(selectors: string): NodeListOf<E>;
-}
-
-interface Path2D extends CanvasPathMethods {
-}
-
-declare var Path2D: {
-    prototype: Path2D;
-    new(d?: Path2D | string): Path2D;
-};
-
-interface PaymentAddress {
-    readonly addressLine: string[];
-    readonly city: string;
-    readonly country: string;
-    readonly dependentLocality: string;
-    readonly languageCode: string;
-    readonly organization: string;
-    readonly phone: string;
-    readonly postalCode: string;
-    readonly recipient: string;
-    readonly region: string;
-    readonly sortingCode: string;
-    toJSON(): any;
-}
-
-declare var PaymentAddress: {
-    prototype: PaymentAddress;
-    new(): PaymentAddress;
-};
-
-interface PaymentRequestEventMap {
-    "shippingaddresschange": Event;
-    "shippingoptionchange": Event;
-}
-
-interface PaymentRequest extends EventTarget {
-    readonly id: string;
-    onshippingaddresschange: ((this: PaymentRequest, ev: Event) => any) | null;
-    onshippingoptionchange: ((this: PaymentRequest, ev: Event) => any) | null;
-    readonly shippingAddress: PaymentAddress | null;
-    readonly shippingOption: string | null;
-    readonly shippingType: PaymentShippingType | null;
-    abort(): Promise<void>;
-    canMakePayment(): Promise<boolean>;
-    show(): Promise<PaymentResponse>;
-    addEventListener<K extends keyof PaymentRequestEventMap>(type: K, listener: (this: PaymentRequest, ev: PaymentRequestEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof PaymentRequestEventMap>(type: K, listener: (this: PaymentRequest, ev: PaymentRequestEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var PaymentRequest: {
-    prototype: PaymentRequest;
-    new(methodData: PaymentMethodData[], details: PaymentDetailsInit, options?: PaymentOptions): PaymentRequest;
-};
-
-interface PaymentRequestUpdateEvent extends Event {
-    updateWith(detailsPromise: Promise<PaymentDetailsUpdate>): void;
-}
-
-declare var PaymentRequestUpdateEvent: {
-    prototype: PaymentRequestUpdateEvent;
-    new(type: string, eventInitDict?: PaymentRequestUpdateEventInit): PaymentRequestUpdateEvent;
-};
-
-interface PaymentResponse {
-    readonly details: any;
-    readonly methodName: string;
-    readonly payerEmail: string | null;
-    readonly payerName: string | null;
-    readonly payerPhone: string | null;
-    readonly requestId: string;
-    readonly shippingAddress: PaymentAddress | null;
-    readonly shippingOption: string | null;
-    complete(result?: PaymentComplete): Promise<void>;
-    toJSON(): any;
-}
-
-declare var PaymentResponse: {
-    prototype: PaymentResponse;
-    new(): PaymentResponse;
-};
-
-interface PerfWidgetExternal {
-    readonly activeNetworkRequestCount: number;
-    readonly averageFrameTime: number;
-    readonly averagePaintTime: number;
-    readonly extraInformationEnabled: boolean;
-    readonly independentRenderingEnabled: boolean;
-    readonly irDisablingContentString: string;
-    readonly irStatusAvailable: boolean;
-    readonly maxCpuSpeed: number;
-    readonly paintRequestsPerSecond: number;
-    readonly performanceCounter: number;
-    readonly performanceCounterFrequency: number;
-    addEventListener(eventType: string, callback: Function): void;
-    getMemoryUsage(): number;
-    getProcessCpuUsage(): number;
-    getRecentCpuUsage(last: number | null): any;
-    getRecentFrames(last: number | null): any;
-    getRecentMemoryUsage(last: number | null): any;
-    getRecentPaintRequests(last: number | null): any;
-    removeEventListener(eventType: string, callback: Function): void;
-    repositionWindow(x: number, y: number): void;
-    resizeWindow(width: number, height: number): void;
-}
-
-declare var PerfWidgetExternal: {
-    prototype: PerfWidgetExternal;
-    new(): PerfWidgetExternal;
-};
-
-interface Performance {
-    /** @deprecated */
-    readonly navigation: PerformanceNavigation;
-    readonly timeOrigin: number;
-    /** @deprecated */
-    readonly timing: PerformanceTiming;
-    clearMarks(markName?: string): void;
-    clearMeasures(measureName?: string): void;
-    clearResourceTimings(): void;
-    getEntries(): any;
-    getEntriesByName(name: string, type?: string): any;
-    getEntriesByType(type: string): any;
-    /** @deprecated */
-    getMarks(markName?: string): any;
-    /** @deprecated */
-    getMeasures(measureName?: string): any;
-    mark(markName: string): void;
-    measure(measureName: string, startMarkName?: string, endMarkName?: string): void;
-    now(): number;
-    setResourceTimingBufferSize(maxSize: number): void;
-    toJSON(): any;
-}
-
-declare var Performance: {
-    prototype: Performance;
-    new(): Performance;
-};
-
-interface PerformanceEntry {
-    readonly duration: number;
-    readonly entryType: string;
-    readonly name: string;
-    readonly startTime: number;
-    toJSON(): any;
-}
-
-declare var PerformanceEntry: {
-    prototype: PerformanceEntry;
-    new(): PerformanceEntry;
-};
-
-interface PerformanceMark extends PerformanceEntry {
-}
-
-declare var PerformanceMark: {
-    prototype: PerformanceMark;
-    new(): PerformanceMark;
-};
-
-interface PerformanceMeasure extends PerformanceEntry {
-}
-
-declare var PerformanceMeasure: {
-    prototype: PerformanceMeasure;
-    new(): PerformanceMeasure;
-};
-
-interface PerformanceNavigation {
-    readonly redirectCount: number;
-    readonly type: number;
-    toJSON(): any;
-    readonly TYPE_BACK_FORWARD: number;
-    readonly TYPE_NAVIGATE: number;
-    readonly TYPE_RELOAD: number;
-    readonly TYPE_RESERVED: number;
-}
-
-declare var PerformanceNavigation: {
-    prototype: PerformanceNavigation;
-    new(): PerformanceNavigation;
-    readonly TYPE_BACK_FORWARD: number;
-    readonly TYPE_NAVIGATE: number;
-    readonly TYPE_RELOAD: number;
-    readonly TYPE_RESERVED: number;
-};
-
-interface PerformanceNavigationTiming extends PerformanceEntry {
-    /** @deprecated */
-    readonly connectEnd: number;
-    /** @deprecated */
-    readonly connectStart: number;
-    readonly domComplete: number;
-    readonly domContentLoadedEventEnd: number;
-    readonly domContentLoadedEventStart: number;
-    readonly domInteractive: number;
-    /** @deprecated */
-    readonly domLoading: number;
-    /** @deprecated */
-    readonly domainLookupEnd: number;
-    /** @deprecated */
-    readonly domainLookupStart: number;
-    /** @deprecated */
-    readonly fetchStart: number;
-    readonly loadEventEnd: number;
-    readonly loadEventStart: number;
-    /** @deprecated */
-    readonly navigationStart: number;
-    readonly redirectCount: number;
-    /** @deprecated */
-    readonly redirectEnd: number;
-    /** @deprecated */
-    readonly redirectStart: number;
-    /** @deprecated */
-    readonly requestStart: number;
-    /** @deprecated */
-    readonly responseEnd: number;
-    /** @deprecated */
-    readonly responseStart: number;
-    readonly type: NavigationType;
-    readonly unloadEventEnd: number;
-    readonly unloadEventStart: number;
-    readonly workerStart: number;
-}
-
-declare var PerformanceNavigationTiming: {
-    prototype: PerformanceNavigationTiming;
-    new(): PerformanceNavigationTiming;
-};
-
-interface PerformanceResourceTiming extends PerformanceEntry {
-    readonly connectEnd: number;
-    readonly connectStart: number;
-    readonly domainLookupEnd: number;
-    readonly domainLookupStart: number;
-    readonly fetchStart: number;
-    readonly initiatorType: string;
-    readonly redirectEnd: number;
-    readonly redirectStart: number;
-    readonly requestStart: number;
-    readonly responseEnd: number;
-    readonly responseStart: number;
-    readonly workerStart: number;
-}
-
-declare var PerformanceResourceTiming: {
-    prototype: PerformanceResourceTiming;
-    new(): PerformanceResourceTiming;
-};
-
-interface PerformanceTiming {
-    readonly connectEnd: number;
-    readonly connectStart: number;
-    readonly domComplete: number;
-    readonly domContentLoadedEventEnd: number;
-    readonly domContentLoadedEventStart: number;
-    readonly domInteractive: number;
-    readonly domLoading: number;
-    readonly domainLookupEnd: number;
-    readonly domainLookupStart: number;
-    readonly fetchStart: number;
-    readonly loadEventEnd: number;
-    readonly loadEventStart: number;
-    readonly msFirstPaint: number;
-    readonly navigationStart: number;
-    readonly redirectEnd: number;
-    readonly redirectStart: number;
-    readonly requestStart: number;
-    readonly responseEnd: number;
-    readonly responseStart: number;
-    readonly secureConnectionStart: number;
-    readonly unloadEventEnd: number;
-    readonly unloadEventStart: number;
-    toJSON(): any;
-}
-
-declare var PerformanceTiming: {
-    prototype: PerformanceTiming;
-    new(): PerformanceTiming;
-};
-
-interface PeriodicWave {
-}
-
-declare var PeriodicWave: {
-    prototype: PeriodicWave;
-    new(): PeriodicWave;
-};
-
-interface PermissionRequest extends DeferredPermissionRequest {
-    readonly state: MSWebViewPermissionState;
-    defer(): void;
-}
-
-declare var PermissionRequest: {
-    prototype: PermissionRequest;
-    new(): PermissionRequest;
-};
-
-interface PermissionRequestedEvent extends Event {
-    readonly permissionRequest: PermissionRequest;
-}
-
-declare var PermissionRequestedEvent: {
-    prototype: PermissionRequestedEvent;
-    new(): PermissionRequestedEvent;
-};
-
-interface Plugin {
-    readonly description: string;
-    readonly filename: string;
-    readonly length: number;
-    readonly name: string;
-    readonly version: string;
-    item(index: number): MimeType;
-    namedItem(type: string): MimeType;
-    [index: number]: MimeType;
-}
-
-declare var Plugin: {
-    prototype: Plugin;
-    new(): Plugin;
-};
-
-interface PluginArray {
-    readonly length: number;
-    item(index: number): Plugin;
-    namedItem(name: string): Plugin;
-    refresh(reload?: boolean): void;
-    [index: number]: Plugin;
-}
-
-declare var PluginArray: {
-    prototype: PluginArray;
-    new(): PluginArray;
-};
-
-interface PointerEvent extends MouseEvent {
-    readonly currentPoint: any;
-    readonly height: number;
-    readonly hwTimestamp: number;
-    readonly intermediatePoints: any;
-    readonly isPrimary: boolean;
-    readonly pointerId: number;
-    readonly pointerType: any;
-    readonly pressure: number;
-    readonly rotation: number;
-    readonly tiltX: number;
-    readonly tiltY: number;
-    readonly width: number;
-    getCurrentPoint(element: Element): void;
-    getIntermediatePoints(element: Element): void;
-    initPointerEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number, screenXArg: number, screenYArg: number, clientXArg: number, clientYArg: number, ctrlKeyArg: boolean, altKeyArg: boolean, shiftKeyArg: boolean, metaKeyArg: boolean, buttonArg: number, relatedTargetArg: EventTarget, offsetXArg: number, offsetYArg: number, widthArg: number, heightArg: number, pressure: number, rotation: number, tiltX: number, tiltY: number, pointerIdArg: number, pointerType: any, hwTimestampArg: number, isPrimary: boolean): void;
-}
-
-declare var PointerEvent: {
-    prototype: PointerEvent;
-    new(typeArg: string, eventInitDict?: PointerEventInit): PointerEvent;
-};
-
-interface PopStateEvent extends Event {
-    readonly state: any;
-}
-
-declare var PopStateEvent: {
-    prototype: PopStateEvent;
-    new(type: string, eventInitDict?: PopStateEventInit): PopStateEvent;
-};
-
-interface Position {
-    readonly coords: Coordinates;
-    readonly timestamp: number;
-}
-
-declare var Position: {
-    prototype: Position;
-    new(): Position;
-};
-
-interface PositionError {
-    readonly code: number;
-    readonly message: string;
-    toString(): string;
-    readonly PERMISSION_DENIED: number;
-    readonly POSITION_UNAVAILABLE: number;
-    readonly TIMEOUT: number;
-}
-
-declare var PositionError: {
-    prototype: PositionError;
-    new(): PositionError;
-    readonly PERMISSION_DENIED: number;
-    readonly POSITION_UNAVAILABLE: number;
-    readonly TIMEOUT: number;
-};
-
-interface ProcessingInstruction extends CharacterData {
-    readonly target: string;
-}
-
-declare var ProcessingInstruction: {
-    prototype: ProcessingInstruction;
-    new(): ProcessingInstruction;
-};
-
-interface ProgressEvent extends Event {
-    readonly lengthComputable: boolean;
-    readonly loaded: number;
-    readonly total: number;
-    initProgressEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, lengthComputableArg: boolean, loadedArg: number, totalArg: number): void;
-}
-
-declare var ProgressEvent: {
-    prototype: ProgressEvent;
-    new(typeArg: string, eventInitDict?: ProgressEventInit): ProgressEvent;
-};
-
-interface PromiseRejectionEvent extends Event {
-    readonly promise: PromiseLike<any>;
-    readonly reason: any;
-}
-
-interface PromiseRejectionEventInit extends EventInit {
-    promise: PromiseLike<any>;
-    reason?: any;
-}
-
-interface PushManager {
-    readonly supportedContentEncodings: ReadonlyArray<string>;
-    getSubscription(): Promise<PushSubscription | null>;
-    permissionState(options?: PushSubscriptionOptionsInit): Promise<PushPermissionState>;
-    subscribe(options?: PushSubscriptionOptionsInit): Promise<PushSubscription>;
-}
-
-declare var PushManager: {
-    prototype: PushManager;
-    new(): PushManager;
-};
-
-interface PushSubscription {
-    readonly endpoint: string;
-    readonly expirationTime: number | null;
-    readonly options: PushSubscriptionOptions;
-    getKey(name: PushEncryptionKeyName): ArrayBuffer | null;
-    toJSON(): any;
-    unsubscribe(): Promise<boolean>;
-}
-
-declare var PushSubscription: {
-    prototype: PushSubscription;
-    new(): PushSubscription;
-};
-
-interface PushSubscriptionOptions {
-    readonly applicationServerKey: ArrayBuffer | null;
-    readonly userVisibleOnly: boolean;
-}
-
-declare var PushSubscriptionOptions: {
-    prototype: PushSubscriptionOptions;
-    new(): PushSubscriptionOptions;
-};
-
-interface RTCDTMFToneChangeEvent extends Event {
-    readonly tone: string;
-}
-
-declare var RTCDTMFToneChangeEvent: {
-    prototype: RTCDTMFToneChangeEvent;
-    new(typeArg: string, eventInitDict: RTCDTMFToneChangeEventInit): RTCDTMFToneChangeEvent;
-};
-
-interface RTCDtlsTransportEventMap {
-    "dtlsstatechange": RTCDtlsTransportStateChangedEvent;
-    "error": Event;
-}
-
-interface RTCDtlsTransport extends RTCStatsProvider {
-    ondtlsstatechange: ((this: RTCDtlsTransport, ev: RTCDtlsTransportStateChangedEvent) => any) | null;
-    onerror: ((this: RTCDtlsTransport, ev: Event) => any) | null;
-    readonly state: RTCDtlsTransportState;
-    readonly transport: RTCIceTransport;
-    getLocalParameters(): RTCDtlsParameters;
-    getRemoteCertificates(): ArrayBuffer[];
-    getRemoteParameters(): RTCDtlsParameters | null;
-    start(remoteParameters: RTCDtlsParameters): void;
-    stop(): void;
-    addEventListener<K extends keyof RTCDtlsTransportEventMap>(type: K, listener: (this: RTCDtlsTransport, ev: RTCDtlsTransportEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCDtlsTransportEventMap>(type: K, listener: (this: RTCDtlsTransport, ev: RTCDtlsTransportEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var RTCDtlsTransport: {
-    prototype: RTCDtlsTransport;
-    new(transport: RTCIceTransport): RTCDtlsTransport;
-};
-
-interface RTCDtlsTransportStateChangedEvent extends Event {
-    readonly state: RTCDtlsTransportState;
-}
-
-declare var RTCDtlsTransportStateChangedEvent: {
-    prototype: RTCDtlsTransportStateChangedEvent;
-    new(): RTCDtlsTransportStateChangedEvent;
-};
-
-interface RTCDtmfSenderEventMap {
-    "tonechange": RTCDTMFToneChangeEvent;
-}
-
-interface RTCDtmfSender extends EventTarget {
-    readonly canInsertDTMF: boolean;
-    readonly duration: number;
-    readonly interToneGap: number;
-    ontonechange: ((this: RTCDtmfSender, ev: RTCDTMFToneChangeEvent) => any) | null;
-    readonly sender: RTCRtpSender;
-    readonly toneBuffer: string;
-    insertDTMF(tones: string, duration?: number, interToneGap?: number): void;
-    addEventListener<K extends keyof RTCDtmfSenderEventMap>(type: K, listener: (this: RTCDtmfSender, ev: RTCDtmfSenderEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCDtmfSenderEventMap>(type: K, listener: (this: RTCDtmfSender, ev: RTCDtmfSenderEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var RTCDtmfSender: {
-    prototype: RTCDtmfSender;
-    new(sender: RTCRtpSender): RTCDtmfSender;
-};
-
-interface RTCIceCandidate {
-    candidate: string | null;
-    sdpMLineIndex: number | null;
-    sdpMid: string | null;
-    toJSON(): any;
-}
-
-declare var RTCIceCandidate: {
-    prototype: RTCIceCandidate;
-    new(candidateInitDict?: RTCIceCandidateInit): RTCIceCandidate;
-};
-
-interface RTCIceCandidatePairChangedEvent extends Event {
-    readonly pair: RTCIceCandidatePair;
-}
-
-declare var RTCIceCandidatePairChangedEvent: {
-    prototype: RTCIceCandidatePairChangedEvent;
-    new(): RTCIceCandidatePairChangedEvent;
-};
-
-interface RTCIceGathererEventMap {
-    "error": Event;
-    "localcandidate": RTCIceGathererEvent;
-}
-
-interface RTCIceGatherer extends RTCStatsProvider {
-    readonly component: RTCIceComponent;
-    onerror: ((this: RTCIceGatherer, ev: Event) => any) | null;
-    onlocalcandidate: ((this: RTCIceGatherer, ev: RTCIceGathererEvent) => any) | null;
-    createAssociatedGatherer(): RTCIceGatherer;
-    getLocalCandidates(): RTCIceCandidateDictionary[];
-    getLocalParameters(): RTCIceParameters;
-    addEventListener<K extends keyof RTCIceGathererEventMap>(type: K, listener: (this: RTCIceGatherer, ev: RTCIceGathererEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCIceGathererEventMap>(type: K, listener: (this: RTCIceGatherer, ev: RTCIceGathererEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var RTCIceGatherer: {
-    prototype: RTCIceGatherer;
-    new(options: RTCIceGatherOptions): RTCIceGatherer;
-};
-
-interface RTCIceGathererEvent extends Event {
-    readonly candidate: RTCIceCandidateDictionary | RTCIceCandidateComplete;
-}
-
-declare var RTCIceGathererEvent: {
-    prototype: RTCIceGathererEvent;
-    new(): RTCIceGathererEvent;
-};
-
-interface RTCIceTransportEventMap {
-    "candidatepairchange": RTCIceCandidatePairChangedEvent;
-    "icestatechange": RTCIceTransportStateChangedEvent;
-}
-
-interface RTCIceTransport extends RTCStatsProvider {
-    readonly component: RTCIceComponent;
-    readonly iceGatherer: RTCIceGatherer | null;
-    oncandidatepairchange: ((this: RTCIceTransport, ev: RTCIceCandidatePairChangedEvent) => any) | null;
-    onicestatechange: ((this: RTCIceTransport, ev: RTCIceTransportStateChangedEvent) => any) | null;
-    readonly role: RTCIceRole;
-    readonly state: RTCIceTransportState;
-    addRemoteCandidate(remoteCandidate: RTCIceCandidateDictionary | RTCIceCandidateComplete): void;
-    createAssociatedTransport(): RTCIceTransport;
-    getNominatedCandidatePair(): RTCIceCandidatePair | null;
-    getRemoteCandidates(): RTCIceCandidateDictionary[];
-    getRemoteParameters(): RTCIceParameters | null;
-    setRemoteCandidates(remoteCandidates: RTCIceCandidateDictionary[]): void;
-    start(gatherer: RTCIceGatherer, remoteParameters: RTCIceParameters, role?: RTCIceRole): void;
-    stop(): void;
-    addEventListener<K extends keyof RTCIceTransportEventMap>(type: K, listener: (this: RTCIceTransport, ev: RTCIceTransportEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCIceTransportEventMap>(type: K, listener: (this: RTCIceTransport, ev: RTCIceTransportEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var RTCIceTransport: {
-    prototype: RTCIceTransport;
-    new(): RTCIceTransport;
-};
-
-interface RTCIceTransportStateChangedEvent extends Event {
-    readonly state: RTCIceTransportState;
-}
-
-declare var RTCIceTransportStateChangedEvent: {
-    prototype: RTCIceTransportStateChangedEvent;
-    new(): RTCIceTransportStateChangedEvent;
-};
-
-interface RTCPeerConnectionEventMap {
-    "addstream": MediaStreamEvent;
-    "icecandidate": RTCPeerConnectionIceEvent;
-    "iceconnectionstatechange": Event;
-    "icegatheringstatechange": Event;
-    "negotiationneeded": Event;
-    "removestream": MediaStreamEvent;
-    "signalingstatechange": Event;
-}
-
-interface RTCPeerConnection extends EventTarget {
-    readonly canTrickleIceCandidates: boolean | null;
-    readonly iceConnectionState: RTCIceConnectionState;
-    readonly iceGatheringState: RTCIceGatheringState;
-    readonly localDescription: RTCSessionDescription | null;
-    onaddstream: ((this: RTCPeerConnection, ev: MediaStreamEvent) => any) | null;
-    onicecandidate: ((this: RTCPeerConnection, ev: RTCPeerConnectionIceEvent) => any) | null;
-    oniceconnectionstatechange: ((this: RTCPeerConnection, ev: Event) => any) | null;
-    onicegatheringstatechange: ((this: RTCPeerConnection, ev: Event) => any) | null;
-    onnegotiationneeded: ((this: RTCPeerConnection, ev: Event) => any) | null;
-    onremovestream: ((this: RTCPeerConnection, ev: MediaStreamEvent) => any) | null;
-    onsignalingstatechange: ((this: RTCPeerConnection, ev: Event) => any) | null;
-    readonly remoteDescription: RTCSessionDescription | null;
-    readonly signalingState: RTCSignalingState;
-    addIceCandidate(candidate: RTCIceCandidateInit | RTCIceCandidate): Promise<void>;
-    addStream(stream: MediaStream): void;
-    close(): void;
-    createAnswer(options?: RTCOfferOptions): Promise<RTCSessionDescriptionInit>;
-    createOffer(options?: RTCOfferOptions): Promise<RTCSessionDescriptionInit>;
-    getConfiguration(): RTCConfiguration;
-    getLocalStreams(): MediaStream[];
-    getRemoteStreams(): MediaStream[];
-    getStats(selector: MediaStreamTrack | null, successCallback?: RTCStatsCallback, failureCallback?: RTCPeerConnectionErrorCallback): Promise<RTCStatsReport>;
-    getStreamById(streamId: string): MediaStream | null;
-    removeStream(stream: MediaStream): void;
-    setLocalDescription(description: RTCSessionDescriptionInit): Promise<void>;
-    setRemoteDescription(description: RTCSessionDescriptionInit): Promise<void>;
-    addEventListener<K extends keyof RTCPeerConnectionEventMap>(type: K, listener: (this: RTCPeerConnection, ev: RTCPeerConnectionEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCPeerConnectionEventMap>(type: K, listener: (this: RTCPeerConnection, ev: RTCPeerConnectionEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var RTCPeerConnection: {
-    prototype: RTCPeerConnection;
-    new(configuration: RTCConfiguration): RTCPeerConnection;
-};
-
-interface RTCPeerConnectionIceEvent extends Event {
-    readonly candidate: RTCIceCandidate;
-}
-
-declare var RTCPeerConnectionIceEvent: {
-    prototype: RTCPeerConnectionIceEvent;
-    new(type: string, eventInitDict: RTCPeerConnectionIceEventInit): RTCPeerConnectionIceEvent;
-};
-
-interface RTCRtpReceiverEventMap {
-    "error": Event;
-    "msdecodercapacitychange": Event;
-    "msdsh": Event;
-}
-
-interface RTCRtpReceiver extends RTCStatsProvider {
-    onerror: ((this: RTCRtpReceiver, ev: Event) => any) | null;
-    onmsdecodercapacitychange: ((this: RTCRtpReceiver, ev: Event) => any) | null;
-    onmsdsh: ((this: RTCRtpReceiver, ev: Event) => any) | null;
-    readonly rtcpTransport: RTCDtlsTransport;
-    readonly track: MediaStreamTrack | null;
-    readonly transport: RTCDtlsTransport | RTCSrtpSdesTransport;
-    getContributingSources(): RTCRtpContributingSource[];
-    receive(parameters: RTCRtpParameters): void;
-    requestSendCSRC(csrc: number): void;
-    setTransport(transport: RTCDtlsTransport | RTCSrtpSdesTransport, rtcpTransport?: RTCDtlsTransport): void;
-    stop(): void;
-    addEventListener<K extends keyof RTCRtpReceiverEventMap>(type: K, listener: (this: RTCRtpReceiver, ev: RTCRtpReceiverEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCRtpReceiverEventMap>(type: K, listener: (this: RTCRtpReceiver, ev: RTCRtpReceiverEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var RTCRtpReceiver: {
-    prototype: RTCRtpReceiver;
-    new(transport: RTCDtlsTransport | RTCSrtpSdesTransport, kind: string, rtcpTransport?: RTCDtlsTransport): RTCRtpReceiver;
-    getCapabilities(kind?: string): RTCRtpCapabilities;
-};
-
-interface RTCRtpSenderEventMap {
-    "error": Event;
-    "ssrcconflict": RTCSsrcConflictEvent;
-}
-
-interface RTCRtpSender extends RTCStatsProvider {
-    onerror: ((this: RTCRtpSender, ev: Event) => any) | null;
-    onssrcconflict: ((this: RTCRtpSender, ev: RTCSsrcConflictEvent) => any) | null;
-    readonly rtcpTransport: RTCDtlsTransport;
-    readonly track: MediaStreamTrack;
-    readonly transport: RTCDtlsTransport | RTCSrtpSdesTransport;
-    send(parameters: RTCRtpParameters): void;
-    setTrack(track: MediaStreamTrack): void;
-    setTransport(transport: RTCDtlsTransport | RTCSrtpSdesTransport, rtcpTransport?: RTCDtlsTransport): void;
-    stop(): void;
-    addEventListener<K extends keyof RTCRtpSenderEventMap>(type: K, listener: (this: RTCRtpSender, ev: RTCRtpSenderEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCRtpSenderEventMap>(type: K, listener: (this: RTCRtpSender, ev: RTCRtpSenderEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var RTCRtpSender: {
-    prototype: RTCRtpSender;
-    new(track: MediaStreamTrack, transport: RTCDtlsTransport | RTCSrtpSdesTransport, rtcpTransport?: RTCDtlsTransport): RTCRtpSender;
-    getCapabilities(kind?: string): RTCRtpCapabilities;
-};
-
-interface RTCSessionDescription {
-    sdp: string | null;
-    type: RTCSdpType | null;
-    toJSON(): any;
-}
-
-declare var RTCSessionDescription: {
-    prototype: RTCSessionDescription;
-    new(descriptionInitDict?: RTCSessionDescriptionInit): RTCSessionDescription;
-};
-
-interface RTCSrtpSdesTransportEventMap {
-    "error": Event;
-}
-
-interface RTCSrtpSdesTransport extends EventTarget {
-    onerror: ((this: RTCSrtpSdesTransport, ev: Event) => any) | null;
-    readonly transport: RTCIceTransport;
-    addEventListener<K extends keyof RTCSrtpSdesTransportEventMap>(type: K, listener: (this: RTCSrtpSdesTransport, ev: RTCSrtpSdesTransportEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCSrtpSdesTransportEventMap>(type: K, listener: (this: RTCSrtpSdesTransport, ev: RTCSrtpSdesTransportEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var RTCSrtpSdesTransport: {
-    prototype: RTCSrtpSdesTransport;
-    new(transport: RTCIceTransport, encryptParameters: RTCSrtpSdesParameters, decryptParameters: RTCSrtpSdesParameters): RTCSrtpSdesTransport;
-    getLocalParameters(): RTCSrtpSdesParameters[];
-};
-
-interface RTCSsrcConflictEvent extends Event {
-    readonly ssrc: number;
-}
-
-declare var RTCSsrcConflictEvent: {
-    prototype: RTCSsrcConflictEvent;
-    new(): RTCSsrcConflictEvent;
-};
-
-interface RTCStatsProvider extends EventTarget {
-    getStats(): Promise<RTCStatsReport>;
-    msGetStats(): Promise<RTCStatsReport>;
-}
-
-declare var RTCStatsProvider: {
-    prototype: RTCStatsProvider;
-    new(): RTCStatsProvider;
-};
-
-interface RandomSource {
-    getRandomValues<T extends Int8Array | Uint8ClampedArray | Uint8Array | Int16Array | Uint16Array | Int32Array | Uint32Array>(array: T): T;
-}
-
-declare var RandomSource: {
-    prototype: RandomSource;
-    new(): RandomSource;
-};
-
-interface Range {
-    readonly collapsed: boolean;
-    readonly commonAncestorContainer: Node;
-    readonly endContainer: Node;
-    readonly endOffset: number;
-    readonly startContainer: Node;
-    readonly startOffset: number;
-    cloneContents(): DocumentFragment;
-    cloneRange(): Range;
-    collapse(toStart?: boolean): void;
-    compareBoundaryPoints(how: number, sourceRange: Range): number;
-    createContextualFragment(fragment: string): DocumentFragment;
-    deleteContents(): void;
-    detach(): void;
-    expand(Unit: ExpandGranularity): boolean;
-    extractContents(): DocumentFragment;
-    getBoundingClientRect(): ClientRect | DOMRect;
-    getClientRects(): ClientRectList | DOMRectList;
-    insertNode(node: Node): void;
-    isPointInRange(node: Node, offset: number): boolean;
-    selectNode(node: Node): void;
-    selectNodeContents(node: Node): void;
-    setEnd(node: Node, offset: number): void;
-    setEndAfter(node: Node): void;
-    setEndBefore(node: Node): void;
-    setStart(node: Node, offset: number): void;
-    setStartAfter(node: Node): void;
-    setStartBefore(node: Node): void;
-    surroundContents(newParent: Node): void;
-    toString(): string;
-    readonly END_TO_END: number;
-    readonly END_TO_START: number;
-    readonly START_TO_END: number;
-    readonly START_TO_START: number;
-}
-
-declare var Range: {
-    prototype: Range;
-    new(): Range;
-    readonly END_TO_END: number;
-    readonly END_TO_START: number;
-    readonly START_TO_END: number;
-    readonly START_TO_START: number;
-};
-
-interface ReadableStream {
-    readonly locked: boolean;
-    cancel(): Promise<void>;
-    getReader(): ReadableStreamReader;
-}
-
-declare var ReadableStream: {
-    prototype: ReadableStream;
-    new(): ReadableStream;
-};
-
-interface ReadableStreamReader {
-    cancel(): Promise<void>;
-    read(): Promise<any>;
-    releaseLock(): void;
-}
-
-declare var ReadableStreamReader: {
-    prototype: ReadableStreamReader;
-    new(): ReadableStreamReader;
-};
-
-interface Request extends Body {
-    readonly cache: RequestCache;
-    readonly credentials: RequestCredentials;
-    readonly destination: RequestDestination;
-    readonly headers: Headers;
-    readonly integrity: string;
-    readonly keepalive: boolean;
-    readonly method: string;
-    readonly mode: RequestMode;
-    readonly redirect: RequestRedirect;
-    readonly referrer: string;
-    readonly referrerPolicy: ReferrerPolicy;
-    readonly signal: AbortSignal | null;
-    readonly type: RequestType;
-    readonly url: string;
-    clone(): Request;
-}
-
-declare var Request: {
-    prototype: Request;
-    new(input: Request | string, init?: RequestInit): Request;
-};
-
-interface Response extends Body {
-    readonly body: ReadableStream | null;
-    readonly headers: Headers;
-    readonly ok: boolean;
-    readonly redirected: boolean;
-    readonly status: number;
-    readonly statusText: string;
-    readonly type: ResponseType;
-    readonly url: string;
-    clone(): Response;
-}
-
-declare var Response: {
-    prototype: Response;
-    new(body?: Blob | Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | FormData | string | null, init?: ResponseInit): Response;
-    error(): Response;
-    redirect(url: string, status?: number): Response;
-};
-
-interface SVGAElement extends SVGGraphicsElement, SVGURIReference {
-    readonly target: SVGAnimatedString;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGAElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGAElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGAElement: {
-    prototype: SVGAElement;
-    new(): SVGAElement;
-};
-
-interface SVGAngle {
-    readonly unitType: number;
-    value: number;
-    valueAsString: string;
-    valueInSpecifiedUnits: number;
-    convertToSpecifiedUnits(unitType: number): void;
-    newValueSpecifiedUnits(unitType: number, valueInSpecifiedUnits: number): void;
-    readonly SVG_ANGLETYPE_DEG: number;
-    readonly SVG_ANGLETYPE_GRAD: number;
-    readonly SVG_ANGLETYPE_RAD: number;
-    readonly SVG_ANGLETYPE_UNKNOWN: number;
-    readonly SVG_ANGLETYPE_UNSPECIFIED: number;
-}
-
-declare var SVGAngle: {
-    prototype: SVGAngle;
-    new(): SVGAngle;
-    readonly SVG_ANGLETYPE_DEG: number;
-    readonly SVG_ANGLETYPE_GRAD: number;
-    readonly SVG_ANGLETYPE_RAD: number;
-    readonly SVG_ANGLETYPE_UNKNOWN: number;
-    readonly SVG_ANGLETYPE_UNSPECIFIED: number;
-};
-
-interface SVGAnimatedAngle {
-    readonly animVal: SVGAngle;
-    readonly baseVal: SVGAngle;
-}
-
-declare var SVGAnimatedAngle: {
-    prototype: SVGAnimatedAngle;
-    new(): SVGAnimatedAngle;
-};
-
-interface SVGAnimatedBoolean {
-    readonly animVal: boolean;
-    baseVal: boolean;
-}
-
-declare var SVGAnimatedBoolean: {
-    prototype: SVGAnimatedBoolean;
-    new(): SVGAnimatedBoolean;
-};
-
-interface SVGAnimatedEnumeration {
-    readonly animVal: number;
-    baseVal: number;
-}
-
-declare var SVGAnimatedEnumeration: {
-    prototype: SVGAnimatedEnumeration;
-    new(): SVGAnimatedEnumeration;
-};
-
-interface SVGAnimatedInteger {
-    readonly animVal: number;
-    baseVal: number;
-}
-
-declare var SVGAnimatedInteger: {
-    prototype: SVGAnimatedInteger;
-    new(): SVGAnimatedInteger;
-};
-
-interface SVGAnimatedLength {
-    readonly animVal: SVGLength;
-    readonly baseVal: SVGLength;
-}
-
-declare var SVGAnimatedLength: {
-    prototype: SVGAnimatedLength;
-    new(): SVGAnimatedLength;
-};
-
-interface SVGAnimatedLengthList {
-    readonly animVal: SVGLengthList;
-    readonly baseVal: SVGLengthList;
-}
-
-declare var SVGAnimatedLengthList: {
-    prototype: SVGAnimatedLengthList;
-    new(): SVGAnimatedLengthList;
-};
-
-interface SVGAnimatedNumber {
-    readonly animVal: number;
-    baseVal: number;
-}
-
-declare var SVGAnimatedNumber: {
-    prototype: SVGAnimatedNumber;
-    new(): SVGAnimatedNumber;
-};
-
-interface SVGAnimatedNumberList {
-    readonly animVal: SVGNumberList;
-    readonly baseVal: SVGNumberList;
-}
-
-declare var SVGAnimatedNumberList: {
-    prototype: SVGAnimatedNumberList;
-    new(): SVGAnimatedNumberList;
-};
-
-interface SVGAnimatedPoints {
-    readonly animatedPoints: SVGPointList;
-    readonly points: SVGPointList;
-}
-
-interface SVGAnimatedPreserveAspectRatio {
-    readonly animVal: SVGPreserveAspectRatio;
-    readonly baseVal: SVGPreserveAspectRatio;
-}
-
-declare var SVGAnimatedPreserveAspectRatio: {
-    prototype: SVGAnimatedPreserveAspectRatio;
-    new(): SVGAnimatedPreserveAspectRatio;
-};
-
-interface SVGAnimatedRect {
-    readonly animVal: SVGRect;
-    readonly baseVal: SVGRect;
-}
-
-declare var SVGAnimatedRect: {
-    prototype: SVGAnimatedRect;
-    new(): SVGAnimatedRect;
-};
-
-interface SVGAnimatedString {
-    readonly animVal: string;
-    baseVal: string;
-}
-
-declare var SVGAnimatedString: {
-    prototype: SVGAnimatedString;
-    new(): SVGAnimatedString;
-};
-
-interface SVGAnimatedTransformList {
-    readonly animVal: SVGTransformList;
-    readonly baseVal: SVGTransformList;
-}
-
-declare var SVGAnimatedTransformList: {
-    prototype: SVGAnimatedTransformList;
-    new(): SVGAnimatedTransformList;
-};
-
-interface SVGCircleElement extends SVGGraphicsElement {
-    readonly cx: SVGAnimatedLength;
-    readonly cy: SVGAnimatedLength;
-    readonly r: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGCircleElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGCircleElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGCircleElement: {
-    prototype: SVGCircleElement;
-    new(): SVGCircleElement;
-};
-
-interface SVGClipPathElement extends SVGGraphicsElement, SVGUnitTypes {
-    readonly clipPathUnits: SVGAnimatedEnumeration;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGClipPathElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGClipPathElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGClipPathElement: {
-    prototype: SVGClipPathElement;
-    new(): SVGClipPathElement;
-};
-
-interface SVGComponentTransferFunctionElement extends SVGElement {
-    readonly amplitude: SVGAnimatedNumber;
-    readonly exponent: SVGAnimatedNumber;
-    readonly intercept: SVGAnimatedNumber;
-    readonly offset: SVGAnimatedNumber;
-    readonly slope: SVGAnimatedNumber;
-    readonly tableValues: SVGAnimatedNumberList;
-    readonly type: SVGAnimatedEnumeration;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_DISCRETE: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_GAMMA: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_IDENTITY: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_LINEAR: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_TABLE: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGComponentTransferFunctionElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGComponentTransferFunctionElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGComponentTransferFunctionElement: {
-    prototype: SVGComponentTransferFunctionElement;
-    new(): SVGComponentTransferFunctionElement;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_DISCRETE: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_GAMMA: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_IDENTITY: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_LINEAR: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_TABLE: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_UNKNOWN: number;
-};
-
-interface SVGDefsElement extends SVGGraphicsElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGDefsElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGDefsElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGDefsElement: {
-    prototype: SVGDefsElement;
-    new(): SVGDefsElement;
-};
-
-interface SVGDescElement extends SVGElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGDescElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGDescElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGDescElement: {
-    prototype: SVGDescElement;
-    new(): SVGDescElement;
-};
-
-interface SVGElementEventMap extends ElementEventMap {
-    "click": MouseEvent;
-    "dblclick": MouseEvent;
-    "focusin": FocusEvent;
-    "focusout": FocusEvent;
-    "load": Event;
-    "mousedown": MouseEvent;
-    "mousemove": MouseEvent;
-    "mouseout": MouseEvent;
-    "mouseover": MouseEvent;
-    "mouseup": MouseEvent;
-}
-
-interface SVGElement extends Element, ElementCSSInlineStyle {
-    readonly className: any;
-    onclick: ((this: SVGElement, ev: MouseEvent) => any) | null;
-    ondblclick: ((this: SVGElement, ev: MouseEvent) => any) | null;
-    onfocusin: ((this: SVGElement, ev: FocusEvent) => any) | null;
-    onfocusout: ((this: SVGElement, ev: FocusEvent) => any) | null;
-    onload: ((this: SVGElement, ev: Event) => any) | null;
-    onmousedown: ((this: SVGElement, ev: MouseEvent) => any) | null;
-    onmousemove: ((this: SVGElement, ev: MouseEvent) => any) | null;
-    onmouseout: ((this: SVGElement, ev: MouseEvent) => any) | null;
-    onmouseover: ((this: SVGElement, ev: MouseEvent) => any) | null;
-    onmouseup: ((this: SVGElement, ev: MouseEvent) => any) | null;
-    readonly ownerSVGElement: SVGSVGElement | null;
-    readonly viewportElement: SVGElement | null;
-    /** @deprecated */
-    xmlbase: string;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGElement: {
-    prototype: SVGElement;
-    new(): SVGElement;
-};
-
-interface SVGElementInstance extends EventTarget {
-    readonly childNodes: SVGElementInstanceList;
-    readonly correspondingElement: SVGElement;
-    readonly correspondingUseElement: SVGUseElement;
-    readonly firstChild: SVGElementInstance;
-    readonly lastChild: SVGElementInstance;
-    readonly nextSibling: SVGElementInstance;
-    readonly parentNode: SVGElementInstance;
-    readonly previousSibling: SVGElementInstance;
-}
-
-declare var SVGElementInstance: {
-    prototype: SVGElementInstance;
-    new(): SVGElementInstance;
-};
-
-interface SVGElementInstanceList {
-    /** @deprecated */
-    readonly length: number;
-    /** @deprecated */
-    item(index: number): SVGElementInstance;
-}
-
-declare var SVGElementInstanceList: {
-    prototype: SVGElementInstanceList;
-    new(): SVGElementInstanceList;
-};
-
-interface SVGEllipseElement extends SVGGraphicsElement {
-    readonly cx: SVGAnimatedLength;
-    readonly cy: SVGAnimatedLength;
-    readonly rx: SVGAnimatedLength;
-    readonly ry: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGEllipseElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGEllipseElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGEllipseElement: {
-    prototype: SVGEllipseElement;
-    new(): SVGEllipseElement;
-};
-
-interface SVGFEBlendElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    readonly in2: SVGAnimatedString;
-    readonly mode: SVGAnimatedEnumeration;
-    readonly SVG_FEBLEND_MODE_COLOR: number;
-    readonly SVG_FEBLEND_MODE_COLOR_BURN: number;
-    readonly SVG_FEBLEND_MODE_COLOR_DODGE: number;
-    readonly SVG_FEBLEND_MODE_DARKEN: number;
-    readonly SVG_FEBLEND_MODE_DIFFERENCE: number;
-    readonly SVG_FEBLEND_MODE_EXCLUSION: number;
-    readonly SVG_FEBLEND_MODE_HARD_LIGHT: number;
-    readonly SVG_FEBLEND_MODE_HUE: number;
-    readonly SVG_FEBLEND_MODE_LIGHTEN: number;
-    readonly SVG_FEBLEND_MODE_LUMINOSITY: number;
-    readonly SVG_FEBLEND_MODE_MULTIPLY: number;
-    readonly SVG_FEBLEND_MODE_NORMAL: number;
-    readonly SVG_FEBLEND_MODE_OVERLAY: number;
-    readonly SVG_FEBLEND_MODE_SATURATION: number;
-    readonly SVG_FEBLEND_MODE_SCREEN: number;
-    readonly SVG_FEBLEND_MODE_SOFT_LIGHT: number;
-    readonly SVG_FEBLEND_MODE_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEBlendElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEBlendElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEBlendElement: {
-    prototype: SVGFEBlendElement;
-    new(): SVGFEBlendElement;
-    readonly SVG_FEBLEND_MODE_COLOR: number;
-    readonly SVG_FEBLEND_MODE_COLOR_BURN: number;
-    readonly SVG_FEBLEND_MODE_COLOR_DODGE: number;
-    readonly SVG_FEBLEND_MODE_DARKEN: number;
-    readonly SVG_FEBLEND_MODE_DIFFERENCE: number;
-    readonly SVG_FEBLEND_MODE_EXCLUSION: number;
-    readonly SVG_FEBLEND_MODE_HARD_LIGHT: number;
-    readonly SVG_FEBLEND_MODE_HUE: number;
-    readonly SVG_FEBLEND_MODE_LIGHTEN: number;
-    readonly SVG_FEBLEND_MODE_LUMINOSITY: number;
-    readonly SVG_FEBLEND_MODE_MULTIPLY: number;
-    readonly SVG_FEBLEND_MODE_NORMAL: number;
-    readonly SVG_FEBLEND_MODE_OVERLAY: number;
-    readonly SVG_FEBLEND_MODE_SATURATION: number;
-    readonly SVG_FEBLEND_MODE_SCREEN: number;
-    readonly SVG_FEBLEND_MODE_SOFT_LIGHT: number;
-    readonly SVG_FEBLEND_MODE_UNKNOWN: number;
-};
-
-interface SVGFEColorMatrixElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    readonly type: SVGAnimatedEnumeration;
-    readonly values: SVGAnimatedNumberList;
-    readonly SVG_FECOLORMATRIX_TYPE_HUEROTATE: number;
-    readonly SVG_FECOLORMATRIX_TYPE_LUMINANCETOALPHA: number;
-    readonly SVG_FECOLORMATRIX_TYPE_MATRIX: number;
-    readonly SVG_FECOLORMATRIX_TYPE_SATURATE: number;
-    readonly SVG_FECOLORMATRIX_TYPE_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEColorMatrixElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEColorMatrixElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEColorMatrixElement: {
-    prototype: SVGFEColorMatrixElement;
-    new(): SVGFEColorMatrixElement;
-    readonly SVG_FECOLORMATRIX_TYPE_HUEROTATE: number;
-    readonly SVG_FECOLORMATRIX_TYPE_LUMINANCETOALPHA: number;
-    readonly SVG_FECOLORMATRIX_TYPE_MATRIX: number;
-    readonly SVG_FECOLORMATRIX_TYPE_SATURATE: number;
-    readonly SVG_FECOLORMATRIX_TYPE_UNKNOWN: number;
-};
-
-interface SVGFEComponentTransferElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEComponentTransferElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEComponentTransferElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEComponentTransferElement: {
-    prototype: SVGFEComponentTransferElement;
-    new(): SVGFEComponentTransferElement;
-};
-
-interface SVGFECompositeElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    readonly in2: SVGAnimatedString;
-    readonly k1: SVGAnimatedNumber;
-    readonly k2: SVGAnimatedNumber;
-    readonly k3: SVGAnimatedNumber;
-    readonly k4: SVGAnimatedNumber;
-    readonly operator: SVGAnimatedEnumeration;
-    readonly SVG_FECOMPOSITE_OPERATOR_ARITHMETIC: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_ATOP: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_IN: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_OUT: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_OVER: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_UNKNOWN: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_XOR: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFECompositeElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFECompositeElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFECompositeElement: {
-    prototype: SVGFECompositeElement;
-    new(): SVGFECompositeElement;
-    readonly SVG_FECOMPOSITE_OPERATOR_ARITHMETIC: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_ATOP: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_IN: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_OUT: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_OVER: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_UNKNOWN: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_XOR: number;
-};
-
-interface SVGFEConvolveMatrixElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly bias: SVGAnimatedNumber;
-    readonly divisor: SVGAnimatedNumber;
-    readonly edgeMode: SVGAnimatedEnumeration;
-    readonly in1: SVGAnimatedString;
-    readonly kernelMatrix: SVGAnimatedNumberList;
-    readonly kernelUnitLengthX: SVGAnimatedNumber;
-    readonly kernelUnitLengthY: SVGAnimatedNumber;
-    readonly orderX: SVGAnimatedInteger;
-    readonly orderY: SVGAnimatedInteger;
-    readonly preserveAlpha: SVGAnimatedBoolean;
-    readonly targetX: SVGAnimatedInteger;
-    readonly targetY: SVGAnimatedInteger;
-    readonly SVG_EDGEMODE_DUPLICATE: number;
-    readonly SVG_EDGEMODE_NONE: number;
-    readonly SVG_EDGEMODE_UNKNOWN: number;
-    readonly SVG_EDGEMODE_WRAP: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEConvolveMatrixElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEConvolveMatrixElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEConvolveMatrixElement: {
-    prototype: SVGFEConvolveMatrixElement;
-    new(): SVGFEConvolveMatrixElement;
-    readonly SVG_EDGEMODE_DUPLICATE: number;
-    readonly SVG_EDGEMODE_NONE: number;
-    readonly SVG_EDGEMODE_UNKNOWN: number;
-    readonly SVG_EDGEMODE_WRAP: number;
-};
-
-interface SVGFEDiffuseLightingElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly diffuseConstant: SVGAnimatedNumber;
-    readonly in1: SVGAnimatedString;
-    readonly kernelUnitLengthX: SVGAnimatedNumber;
-    readonly kernelUnitLengthY: SVGAnimatedNumber;
-    readonly surfaceScale: SVGAnimatedNumber;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEDiffuseLightingElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEDiffuseLightingElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEDiffuseLightingElement: {
-    prototype: SVGFEDiffuseLightingElement;
-    new(): SVGFEDiffuseLightingElement;
-};
-
-interface SVGFEDisplacementMapElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    readonly in2: SVGAnimatedString;
-    readonly scale: SVGAnimatedNumber;
-    readonly xChannelSelector: SVGAnimatedEnumeration;
-    readonly yChannelSelector: SVGAnimatedEnumeration;
-    readonly SVG_CHANNEL_A: number;
-    readonly SVG_CHANNEL_B: number;
-    readonly SVG_CHANNEL_G: number;
-    readonly SVG_CHANNEL_R: number;
-    readonly SVG_CHANNEL_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEDisplacementMapElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEDisplacementMapElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEDisplacementMapElement: {
-    prototype: SVGFEDisplacementMapElement;
-    new(): SVGFEDisplacementMapElement;
-    readonly SVG_CHANNEL_A: number;
-    readonly SVG_CHANNEL_B: number;
-    readonly SVG_CHANNEL_G: number;
-    readonly SVG_CHANNEL_R: number;
-    readonly SVG_CHANNEL_UNKNOWN: number;
-};
-
-interface SVGFEDistantLightElement extends SVGElement {
-    readonly azimuth: SVGAnimatedNumber;
-    readonly elevation: SVGAnimatedNumber;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEDistantLightElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEDistantLightElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEDistantLightElement: {
-    prototype: SVGFEDistantLightElement;
-    new(): SVGFEDistantLightElement;
-};
-
-interface SVGFEFloodElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFloodElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFloodElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEFloodElement: {
-    prototype: SVGFEFloodElement;
-    new(): SVGFEFloodElement;
-};
-
-interface SVGFEFuncAElement extends SVGComponentTransferFunctionElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFuncAElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFuncAElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEFuncAElement: {
-    prototype: SVGFEFuncAElement;
-    new(): SVGFEFuncAElement;
-};
-
-interface SVGFEFuncBElement extends SVGComponentTransferFunctionElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFuncBElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFuncBElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEFuncBElement: {
-    prototype: SVGFEFuncBElement;
-    new(): SVGFEFuncBElement;
-};
-
-interface SVGFEFuncGElement extends SVGComponentTransferFunctionElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFuncGElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFuncGElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEFuncGElement: {
-    prototype: SVGFEFuncGElement;
-    new(): SVGFEFuncGElement;
-};
-
-interface SVGFEFuncRElement extends SVGComponentTransferFunctionElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFuncRElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFuncRElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEFuncRElement: {
-    prototype: SVGFEFuncRElement;
-    new(): SVGFEFuncRElement;
-};
-
-interface SVGFEGaussianBlurElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    readonly stdDeviationX: SVGAnimatedNumber;
-    readonly stdDeviationY: SVGAnimatedNumber;
-    setStdDeviation(stdDeviationX: number, stdDeviationY: number): void;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEGaussianBlurElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEGaussianBlurElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEGaussianBlurElement: {
-    prototype: SVGFEGaussianBlurElement;
-    new(): SVGFEGaussianBlurElement;
-};
-
-interface SVGFEImageElement extends SVGElement, SVGFilterPrimitiveStandardAttributes, SVGURIReference {
-    readonly preserveAspectRatio: SVGAnimatedPreserveAspectRatio;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEImageElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEImageElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEImageElement: {
-    prototype: SVGFEImageElement;
-    new(): SVGFEImageElement;
-};
-
-interface SVGFEMergeElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEMergeElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEMergeElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEMergeElement: {
-    prototype: SVGFEMergeElement;
-    new(): SVGFEMergeElement;
-};
-
-interface SVGFEMergeNodeElement extends SVGElement {
-    readonly in1: SVGAnimatedString;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEMergeNodeElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEMergeNodeElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEMergeNodeElement: {
-    prototype: SVGFEMergeNodeElement;
-    new(): SVGFEMergeNodeElement;
-};
-
-interface SVGFEMorphologyElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    readonly operator: SVGAnimatedEnumeration;
-    readonly radiusX: SVGAnimatedNumber;
-    readonly radiusY: SVGAnimatedNumber;
-    readonly SVG_MORPHOLOGY_OPERATOR_DILATE: number;
-    readonly SVG_MORPHOLOGY_OPERATOR_ERODE: number;
-    readonly SVG_MORPHOLOGY_OPERATOR_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEMorphologyElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEMorphologyElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEMorphologyElement: {
-    prototype: SVGFEMorphologyElement;
-    new(): SVGFEMorphologyElement;
-    readonly SVG_MORPHOLOGY_OPERATOR_DILATE: number;
-    readonly SVG_MORPHOLOGY_OPERATOR_ERODE: number;
-    readonly SVG_MORPHOLOGY_OPERATOR_UNKNOWN: number;
-};
-
-interface SVGFEOffsetElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly dx: SVGAnimatedNumber;
-    readonly dy: SVGAnimatedNumber;
-    readonly in1: SVGAnimatedString;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEOffsetElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEOffsetElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEOffsetElement: {
-    prototype: SVGFEOffsetElement;
-    new(): SVGFEOffsetElement;
-};
-
-interface SVGFEPointLightElement extends SVGElement {
-    readonly x: SVGAnimatedNumber;
-    readonly y: SVGAnimatedNumber;
-    readonly z: SVGAnimatedNumber;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEPointLightElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEPointLightElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEPointLightElement: {
-    prototype: SVGFEPointLightElement;
-    new(): SVGFEPointLightElement;
-};
-
-interface SVGFESpecularLightingElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    readonly kernelUnitLengthX: SVGAnimatedNumber;
-    readonly kernelUnitLengthY: SVGAnimatedNumber;
-    readonly specularConstant: SVGAnimatedNumber;
-    readonly specularExponent: SVGAnimatedNumber;
-    readonly surfaceScale: SVGAnimatedNumber;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFESpecularLightingElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFESpecularLightingElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFESpecularLightingElement: {
-    prototype: SVGFESpecularLightingElement;
-    new(): SVGFESpecularLightingElement;
-};
-
-interface SVGFESpotLightElement extends SVGElement {
-    readonly limitingConeAngle: SVGAnimatedNumber;
-    readonly pointsAtX: SVGAnimatedNumber;
-    readonly pointsAtY: SVGAnimatedNumber;
-    readonly pointsAtZ: SVGAnimatedNumber;
-    readonly specularExponent: SVGAnimatedNumber;
-    readonly x: SVGAnimatedNumber;
-    readonly y: SVGAnimatedNumber;
-    readonly z: SVGAnimatedNumber;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFESpotLightElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFESpotLightElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFESpotLightElement: {
-    prototype: SVGFESpotLightElement;
-    new(): SVGFESpotLightElement;
-};
-
-interface SVGFETileElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFETileElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFETileElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFETileElement: {
-    prototype: SVGFETileElement;
-    new(): SVGFETileElement;
-};
-
-interface SVGFETurbulenceElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly baseFrequencyX: SVGAnimatedNumber;
-    readonly baseFrequencyY: SVGAnimatedNumber;
-    readonly numOctaves: SVGAnimatedInteger;
-    readonly seed: SVGAnimatedNumber;
-    readonly stitchTiles: SVGAnimatedEnumeration;
-    readonly type: SVGAnimatedEnumeration;
-    readonly SVG_STITCHTYPE_NOSTITCH: number;
-    readonly SVG_STITCHTYPE_STITCH: number;
-    readonly SVG_STITCHTYPE_UNKNOWN: number;
-    readonly SVG_TURBULENCE_TYPE_FRACTALNOISE: number;
-    readonly SVG_TURBULENCE_TYPE_TURBULENCE: number;
-    readonly SVG_TURBULENCE_TYPE_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFETurbulenceElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFETurbulenceElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFETurbulenceElement: {
-    prototype: SVGFETurbulenceElement;
-    new(): SVGFETurbulenceElement;
-    readonly SVG_STITCHTYPE_NOSTITCH: number;
-    readonly SVG_STITCHTYPE_STITCH: number;
-    readonly SVG_STITCHTYPE_UNKNOWN: number;
-    readonly SVG_TURBULENCE_TYPE_FRACTALNOISE: number;
-    readonly SVG_TURBULENCE_TYPE_TURBULENCE: number;
-    readonly SVG_TURBULENCE_TYPE_UNKNOWN: number;
-};
-
-interface SVGFilterElement extends SVGElement, SVGUnitTypes, SVGURIReference {
-    /** @deprecated */
-    readonly filterResX: SVGAnimatedInteger;
-    /** @deprecated */
-    readonly filterResY: SVGAnimatedInteger;
-    readonly filterUnits: SVGAnimatedEnumeration;
-    readonly height: SVGAnimatedLength;
-    readonly primitiveUnits: SVGAnimatedEnumeration;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-    /** @deprecated */
-    setFilterRes(filterResX: number, filterResY: number): void;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFilterElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFilterElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFilterElement: {
-    prototype: SVGFilterElement;
-    new(): SVGFilterElement;
-};
-
-interface SVGFilterPrimitiveStandardAttributes {
-    readonly height: SVGAnimatedLength;
-    readonly result: SVGAnimatedString;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-}
-
-interface SVGFitToViewBox {
-    readonly preserveAspectRatio: SVGAnimatedPreserveAspectRatio;
-    readonly viewBox: SVGAnimatedRect;
-}
-
-interface SVGForeignObjectElement extends SVGGraphicsElement {
-    readonly height: SVGAnimatedLength;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGForeignObjectElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGForeignObjectElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGForeignObjectElement: {
-    prototype: SVGForeignObjectElement;
-    new(): SVGForeignObjectElement;
-};
-
-interface SVGGElement extends SVGGraphicsElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGGElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGGElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGGElement: {
-    prototype: SVGGElement;
-    new(): SVGGElement;
-};
-
-interface SVGGradientElement extends SVGElement, SVGUnitTypes, SVGURIReference {
-    readonly gradientTransform: SVGAnimatedTransformList;
-    readonly gradientUnits: SVGAnimatedEnumeration;
-    readonly spreadMethod: SVGAnimatedEnumeration;
-    readonly SVG_SPREADMETHOD_PAD: number;
-    readonly SVG_SPREADMETHOD_REFLECT: number;
-    readonly SVG_SPREADMETHOD_REPEAT: number;
-    readonly SVG_SPREADMETHOD_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGGradientElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGGradientElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGGradientElement: {
-    prototype: SVGGradientElement;
-    new(): SVGGradientElement;
-    readonly SVG_SPREADMETHOD_PAD: number;
-    readonly SVG_SPREADMETHOD_REFLECT: number;
-    readonly SVG_SPREADMETHOD_REPEAT: number;
-    readonly SVG_SPREADMETHOD_UNKNOWN: number;
-};
-
-interface SVGGraphicsElement extends SVGElement, SVGTests {
-    /** @deprecated */
-    readonly farthestViewportElement: SVGElement | null;
-    /** @deprecated */
-    readonly nearestViewportElement: SVGElement | null;
-    readonly transform: SVGAnimatedTransformList;
-    getBBox(): SVGRect;
-    getCTM(): SVGMatrix | null;
-    getScreenCTM(): SVGMatrix | null;
-    /** @deprecated */
-    getTransformToElement(element: SVGElement): SVGMatrix;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGGraphicsElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGGraphicsElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGGraphicsElement: {
-    prototype: SVGGraphicsElement;
-    new(): SVGGraphicsElement;
-};
-
-interface SVGImageElement extends SVGGraphicsElement, SVGURIReference {
-    readonly height: SVGAnimatedLength;
-    readonly preserveAspectRatio: SVGAnimatedPreserveAspectRatio;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGImageElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGImageElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGImageElement: {
-    prototype: SVGImageElement;
-    new(): SVGImageElement;
-};
-
-interface SVGLength {
-    readonly unitType: number;
-    value: number;
-    valueAsString: string;
-    valueInSpecifiedUnits: number;
-    convertToSpecifiedUnits(unitType: number): void;
-    newValueSpecifiedUnits(unitType: number, valueInSpecifiedUnits: number): void;
-    readonly SVG_LENGTHTYPE_CM: number;
-    readonly SVG_LENGTHTYPE_EMS: number;
-    readonly SVG_LENGTHTYPE_EXS: number;
-    readonly SVG_LENGTHTYPE_IN: number;
-    readonly SVG_LENGTHTYPE_MM: number;
-    readonly SVG_LENGTHTYPE_NUMBER: number;
-    readonly SVG_LENGTHTYPE_PC: number;
-    readonly SVG_LENGTHTYPE_PERCENTAGE: number;
-    readonly SVG_LENGTHTYPE_PT: number;
-    readonly SVG_LENGTHTYPE_PX: number;
-    readonly SVG_LENGTHTYPE_UNKNOWN: number;
-}
-
-declare var SVGLength: {
-    prototype: SVGLength;
-    new(): SVGLength;
-    readonly SVG_LENGTHTYPE_CM: number;
-    readonly SVG_LENGTHTYPE_EMS: number;
-    readonly SVG_LENGTHTYPE_EXS: number;
-    readonly SVG_LENGTHTYPE_IN: number;
-    readonly SVG_LENGTHTYPE_MM: number;
-    readonly SVG_LENGTHTYPE_NUMBER: number;
-    readonly SVG_LENGTHTYPE_PC: number;
-    readonly SVG_LENGTHTYPE_PERCENTAGE: number;
-    readonly SVG_LENGTHTYPE_PT: number;
-    readonly SVG_LENGTHTYPE_PX: number;
-    readonly SVG_LENGTHTYPE_UNKNOWN: number;
-};
-
-interface SVGLengthList {
-    readonly numberOfItems: number;
-    appendItem(newItem: SVGLength): SVGLength;
-    clear(): void;
-    getItem(index: number): SVGLength;
-    initialize(newItem: SVGLength): SVGLength;
-    insertItemBefore(newItem: SVGLength, index: number): SVGLength;
-    removeItem(index: number): SVGLength;
-    replaceItem(newItem: SVGLength, index: number): SVGLength;
-}
-
-declare var SVGLengthList: {
-    prototype: SVGLengthList;
-    new(): SVGLengthList;
-};
-
-interface SVGLineElement extends SVGGraphicsElement {
-    readonly x1: SVGAnimatedLength;
-    readonly x2: SVGAnimatedLength;
-    readonly y1: SVGAnimatedLength;
-    readonly y2: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGLineElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGLineElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGLineElement: {
-    prototype: SVGLineElement;
-    new(): SVGLineElement;
-};
-
-interface SVGLinearGradientElement extends SVGGradientElement {
-    readonly x1: SVGAnimatedLength;
-    readonly x2: SVGAnimatedLength;
-    readonly y1: SVGAnimatedLength;
-    readonly y2: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGLinearGradientElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGLinearGradientElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGLinearGradientElement: {
-    prototype: SVGLinearGradientElement;
-    new(): SVGLinearGradientElement;
-};
-
-interface SVGMarkerElement extends SVGElement, SVGFitToViewBox {
-    readonly markerHeight: SVGAnimatedLength;
-    readonly markerUnits: SVGAnimatedEnumeration;
-    readonly markerWidth: SVGAnimatedLength;
-    readonly orientAngle: SVGAnimatedAngle;
-    readonly orientType: SVGAnimatedEnumeration;
-    readonly refX: SVGAnimatedLength;
-    readonly refY: SVGAnimatedLength;
-    setOrientToAngle(angle: SVGAngle): void;
-    setOrientToAuto(): void;
-    readonly SVG_MARKERUNITS_STROKEWIDTH: number;
-    readonly SVG_MARKERUNITS_UNKNOWN: number;
-    readonly SVG_MARKERUNITS_USERSPACEONUSE: number;
-    readonly SVG_MARKER_ORIENT_ANGLE: number;
-    readonly SVG_MARKER_ORIENT_AUTO: number;
-    readonly SVG_MARKER_ORIENT_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGMarkerElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGMarkerElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGMarkerElement: {
-    prototype: SVGMarkerElement;
-    new(): SVGMarkerElement;
-    readonly SVG_MARKERUNITS_STROKEWIDTH: number;
-    readonly SVG_MARKERUNITS_UNKNOWN: number;
-    readonly SVG_MARKERUNITS_USERSPACEONUSE: number;
-    readonly SVG_MARKER_ORIENT_ANGLE: number;
-    readonly SVG_MARKER_ORIENT_AUTO: number;
-    readonly SVG_MARKER_ORIENT_UNKNOWN: number;
-};
-
-interface SVGMaskElement extends SVGElement, SVGTests, SVGUnitTypes {
-    readonly height: SVGAnimatedLength;
-    readonly maskContentUnits: SVGAnimatedEnumeration;
-    readonly maskUnits: SVGAnimatedEnumeration;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGMaskElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGMaskElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGMaskElement: {
-    prototype: SVGMaskElement;
-    new(): SVGMaskElement;
-};
-
-interface SVGMatrix {
-    a: number;
-    b: number;
-    c: number;
-    d: number;
-    e: number;
-    f: number;
-    flipX(): SVGMatrix;
-    flipY(): SVGMatrix;
-    inverse(): SVGMatrix;
-    multiply(secondMatrix: SVGMatrix): SVGMatrix;
-    rotate(angle: number): SVGMatrix;
-    rotateFromVector(x: number, y: number): SVGMatrix;
-    scale(scaleFactor: number): SVGMatrix;
-    scaleNonUniform(scaleFactorX: number, scaleFactorY: number): SVGMatrix;
-    skewX(angle: number): SVGMatrix;
-    skewY(angle: number): SVGMatrix;
-    translate(x: number, y: number): SVGMatrix;
-}
-
-declare var SVGMatrix: {
-    prototype: SVGMatrix;
-    new(): SVGMatrix;
-};
-
-interface SVGMetadataElement extends SVGElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGMetadataElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGMetadataElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGMetadataElement: {
-    prototype: SVGMetadataElement;
-    new(): SVGMetadataElement;
-};
-
-interface SVGNumber {
-    value: number;
-}
-
-declare var SVGNumber: {
-    prototype: SVGNumber;
-    new(): SVGNumber;
-};
-
-interface SVGNumberList {
-    readonly numberOfItems: number;
-    appendItem(newItem: SVGNumber): SVGNumber;
-    clear(): void;
-    getItem(index: number): SVGNumber;
-    initialize(newItem: SVGNumber): SVGNumber;
-    insertItemBefore(newItem: SVGNumber, index: number): SVGNumber;
-    removeItem(index: number): SVGNumber;
-    replaceItem(newItem: SVGNumber, index: number): SVGNumber;
-}
-
-declare var SVGNumberList: {
-    prototype: SVGNumberList;
-    new(): SVGNumberList;
-};
-
-interface SVGPathElement extends SVGGraphicsElement {
-    /** @deprecated */
-    readonly pathSegList: SVGPathSegList;
-    /** @deprecated */
-    createSVGPathSegArcAbs(x: number, y: number, r1: number, r2: number, angle: number, largeArcFlag: boolean, sweepFlag: boolean): SVGPathSegArcAbs;
-    /** @deprecated */
-    createSVGPathSegArcRel(x: number, y: number, r1: number, r2: number, angle: number, largeArcFlag: boolean, sweepFlag: boolean): SVGPathSegArcRel;
-    /** @deprecated */
-    createSVGPathSegClosePath(): SVGPathSegClosePath;
-    /** @deprecated */
-    createSVGPathSegCurvetoCubicAbs(x: number, y: number, x1: number, y1: number, x2: number, y2: number): SVGPathSegCurvetoCubicAbs;
-    /** @deprecated */
-    createSVGPathSegCurvetoCubicRel(x: number, y: number, x1: number, y1: number, x2: number, y2: number): SVGPathSegCurvetoCubicRel;
-    /** @deprecated */
-    createSVGPathSegCurvetoCubicSmoothAbs(x: number, y: number, x2: number, y2: number): SVGPathSegCurvetoCubicSmoothAbs;
-    /** @deprecated */
-    createSVGPathSegCurvetoCubicSmoothRel(x: number, y: number, x2: number, y2: number): SVGPathSegCurvetoCubicSmoothRel;
-    /** @deprecated */
-    createSVGPathSegCurvetoQuadraticAbs(x: number, y: number, x1: number, y1: number): SVGPathSegCurvetoQuadraticAbs;
-    /** @deprecated */
-    createSVGPathSegCurvetoQuadraticRel(x: number, y: number, x1: number, y1: number): SVGPathSegCurvetoQuadraticRel;
-    /** @deprecated */
-    createSVGPathSegCurvetoQuadraticSmoothAbs(x: number, y: number): SVGPathSegCurvetoQuadraticSmoothAbs;
-    /** @deprecated */
-    createSVGPathSegCurvetoQuadraticSmoothRel(x: number, y: number): SVGPathSegCurvetoQuadraticSmoothRel;
-    /** @deprecated */
-    createSVGPathSegLinetoAbs(x: number, y: number): SVGPathSegLinetoAbs;
-    /** @deprecated */
-    createSVGPathSegLinetoHorizontalAbs(x: number): SVGPathSegLinetoHorizontalAbs;
-    /** @deprecated */
-    createSVGPathSegLinetoHorizontalRel(x: number): SVGPathSegLinetoHorizontalRel;
-    /** @deprecated */
-    createSVGPathSegLinetoRel(x: number, y: number): SVGPathSegLinetoRel;
-    /** @deprecated */
-    createSVGPathSegLinetoVerticalAbs(y: number): SVGPathSegLinetoVerticalAbs;
-    /** @deprecated */
-    createSVGPathSegLinetoVerticalRel(y: number): SVGPathSegLinetoVerticalRel;
-    /** @deprecated */
-    createSVGPathSegMovetoAbs(x: number, y: number): SVGPathSegMovetoAbs;
-    /** @deprecated */
-    createSVGPathSegMovetoRel(x: number, y: number): SVGPathSegMovetoRel;
-    /** @deprecated */
-    getPathSegAtLength(distance: number): number;
-    getPointAtLength(distance: number): SVGPoint;
-    getTotalLength(): number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGPathElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGPathElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGPathElement: {
-    prototype: SVGPathElement;
-    new(): SVGPathElement;
-};
-
-interface SVGPathSeg {
-    readonly pathSegType: number;
-    readonly pathSegTypeAsLetter: string;
-    readonly PATHSEG_ARC_ABS: number;
-    readonly PATHSEG_ARC_REL: number;
-    readonly PATHSEG_CLOSEPATH: number;
-    readonly PATHSEG_CURVETO_CUBIC_ABS: number;
-    readonly PATHSEG_CURVETO_CUBIC_REL: number;
-    readonly PATHSEG_CURVETO_CUBIC_SMOOTH_ABS: number;
-    readonly PATHSEG_CURVETO_CUBIC_SMOOTH_REL: number;
-    readonly PATHSEG_CURVETO_QUADRATIC_ABS: number;
-    readonly PATHSEG_CURVETO_QUADRATIC_REL: number;
-    readonly PATHSEG_CURVETO_QUADRATIC_SMOOTH_ABS: number;
-    readonly PATHSEG_CURVETO_QUADRATIC_SMOOTH_REL: number;
-    readonly PATHSEG_LINETO_ABS: number;
-    readonly PATHSEG_LINETO_HORIZONTAL_ABS: number;
-    readonly PATHSEG_LINETO_HORIZONTAL_REL: number;
-    readonly PATHSEG_LINETO_REL: number;
-    readonly PATHSEG_LINETO_VERTICAL_ABS: number;
-    readonly PATHSEG_LINETO_VERTICAL_REL: number;
-    readonly PATHSEG_MOVETO_ABS: number;
-    readonly PATHSEG_MOVETO_REL: number;
-    readonly PATHSEG_UNKNOWN: number;
-}
-
-declare var SVGPathSeg: {
-    prototype: SVGPathSeg;
-    new(): SVGPathSeg;
-    readonly PATHSEG_ARC_ABS: number;
-    readonly PATHSEG_ARC_REL: number;
-    readonly PATHSEG_CLOSEPATH: number;
-    readonly PATHSEG_CURVETO_CUBIC_ABS: number;
-    readonly PATHSEG_CURVETO_CUBIC_REL: number;
-    readonly PATHSEG_CURVETO_CUBIC_SMOOTH_ABS: number;
-    readonly PATHSEG_CURVETO_CUBIC_SMOOTH_REL: number;
-    readonly PATHSEG_CURVETO_QUADRATIC_ABS: number;
-    readonly PATHSEG_CURVETO_QUADRATIC_REL: number;
-    readonly PATHSEG_CURVETO_QUADRATIC_SMOOTH_ABS: number;
-    readonly PATHSEG_CURVETO_QUADRATIC_SMOOTH_REL: number;
-    readonly PATHSEG_LINETO_ABS: number;
-    readonly PATHSEG_LINETO_HORIZONTAL_ABS: number;
-    readonly PATHSEG_LINETO_HORIZONTAL_REL: number;
-    readonly PATHSEG_LINETO_REL: number;
-    readonly PATHSEG_LINETO_VERTICAL_ABS: number;
-    readonly PATHSEG_LINETO_VERTICAL_REL: number;
-    readonly PATHSEG_MOVETO_ABS: number;
-    readonly PATHSEG_MOVETO_REL: number;
-    readonly PATHSEG_UNKNOWN: number;
-};
-
-interface SVGPathSegArcAbs extends SVGPathSeg {
-    angle: number;
-    largeArcFlag: boolean;
-    r1: number;
-    r2: number;
-    sweepFlag: boolean;
-    x: number;
-    y: number;
-}
-
-declare var SVGPathSegArcAbs: {
-    prototype: SVGPathSegArcAbs;
-    new(): SVGPathSegArcAbs;
-};
-
-interface SVGPathSegArcRel extends SVGPathSeg {
-    angle: number;
-    largeArcFlag: boolean;
-    r1: number;
-    r2: number;
-    sweepFlag: boolean;
-    x: number;
-    y: number;
-}
-
-declare var SVGPathSegArcRel: {
-    prototype: SVGPathSegArcRel;
-    new(): SVGPathSegArcRel;
-};
-
-interface SVGPathSegClosePath extends SVGPathSeg {
-}
-
-declare var SVGPathSegClosePath: {
-    prototype: SVGPathSegClosePath;
-    new(): SVGPathSegClosePath;
-};
-
-interface SVGPathSegCurvetoCubicAbs extends SVGPathSeg {
-    x: number;
-    x1: number;
-    x2: number;
-    y: number;
-    y1: number;
-    y2: number;
-}
-
-declare var SVGPathSegCurvetoCubicAbs: {
-    prototype: SVGPathSegCurvetoCubicAbs;
-    new(): SVGPathSegCurvetoCubicAbs;
-};
-
-interface SVGPathSegCurvetoCubicRel extends SVGPathSeg {
-    x: number;
-    x1: number;
-    x2: number;
-    y: number;
-    y1: number;
-    y2: number;
-}
-
-declare var SVGPathSegCurvetoCubicRel: {
-    prototype: SVGPathSegCurvetoCubicRel;
-    new(): SVGPathSegCurvetoCubicRel;
-};
-
-interface SVGPathSegCurvetoCubicSmoothAbs extends SVGPathSeg {
-    x: number;
-    x2: number;
-    y: number;
-    y2: number;
-}
-
-declare var SVGPathSegCurvetoCubicSmoothAbs: {
-    prototype: SVGPathSegCurvetoCubicSmoothAbs;
-    new(): SVGPathSegCurvetoCubicSmoothAbs;
-};
-
-interface SVGPathSegCurvetoCubicSmoothRel extends SVGPathSeg {
-    x: number;
-    x2: number;
-    y: number;
-    y2: number;
-}
-
-declare var SVGPathSegCurvetoCubicSmoothRel: {
-    prototype: SVGPathSegCurvetoCubicSmoothRel;
-    new(): SVGPathSegCurvetoCubicSmoothRel;
-};
-
-interface SVGPathSegCurvetoQuadraticAbs extends SVGPathSeg {
-    x: number;
-    x1: number;
-    y: number;
-    y1: number;
-}
-
-declare var SVGPathSegCurvetoQuadraticAbs: {
-    prototype: SVGPathSegCurvetoQuadraticAbs;
-    new(): SVGPathSegCurvetoQuadraticAbs;
-};
-
-interface SVGPathSegCurvetoQuadraticRel extends SVGPathSeg {
-    x: number;
-    x1: number;
-    y: number;
-    y1: number;
-}
-
-declare var SVGPathSegCurvetoQuadraticRel: {
-    prototype: SVGPathSegCurvetoQuadraticRel;
-    new(): SVGPathSegCurvetoQuadraticRel;
-};
-
-interface SVGPathSegCurvetoQuadraticSmoothAbs extends SVGPathSeg {
-    x: number;
-    y: number;
-}
-
-declare var SVGPathSegCurvetoQuadraticSmoothAbs: {
-    prototype: SVGPathSegCurvetoQuadraticSmoothAbs;
-    new(): SVGPathSegCurvetoQuadraticSmoothAbs;
-};
-
-interface SVGPathSegCurvetoQuadraticSmoothRel extends SVGPathSeg {
-    x: number;
-    y: number;
-}
-
-declare var SVGPathSegCurvetoQuadraticSmoothRel: {
-    prototype: SVGPathSegCurvetoQuadraticSmoothRel;
-    new(): SVGPathSegCurvetoQuadraticSmoothRel;
-};
-
-interface SVGPathSegLinetoAbs extends SVGPathSeg {
-    x: number;
-    y: number;
-}
-
-declare var SVGPathSegLinetoAbs: {
-    prototype: SVGPathSegLinetoAbs;
-    new(): SVGPathSegLinetoAbs;
-};
-
-interface SVGPathSegLinetoHorizontalAbs extends SVGPathSeg {
-    x: number;
-}
-
-declare var SVGPathSegLinetoHorizontalAbs: {
-    prototype: SVGPathSegLinetoHorizontalAbs;
-    new(): SVGPathSegLinetoHorizontalAbs;
-};
-
-interface SVGPathSegLinetoHorizontalRel extends SVGPathSeg {
-    x: number;
-}
-
-declare var SVGPathSegLinetoHorizontalRel: {
-    prototype: SVGPathSegLinetoHorizontalRel;
-    new(): SVGPathSegLinetoHorizontalRel;
-};
-
-interface SVGPathSegLinetoRel extends SVGPathSeg {
-    x: number;
-    y: number;
-}
-
-declare var SVGPathSegLinetoRel: {
-    prototype: SVGPathSegLinetoRel;
-    new(): SVGPathSegLinetoRel;
-};
-
-interface SVGPathSegLinetoVerticalAbs extends SVGPathSeg {
-    y: number;
-}
-
-declare var SVGPathSegLinetoVerticalAbs: {
-    prototype: SVGPathSegLinetoVerticalAbs;
-    new(): SVGPathSegLinetoVerticalAbs;
-};
-
-interface SVGPathSegLinetoVerticalRel extends SVGPathSeg {
-    y: number;
-}
-
-declare var SVGPathSegLinetoVerticalRel: {
-    prototype: SVGPathSegLinetoVerticalRel;
-    new(): SVGPathSegLinetoVerticalRel;
-};
-
-interface SVGPathSegList {
-    readonly numberOfItems: number;
-    appendItem(newItem: SVGPathSeg): SVGPathSeg;
-    clear(): void;
-    getItem(index: number): SVGPathSeg;
-    initialize(newItem: SVGPathSeg): SVGPathSeg;
-    insertItemBefore(newItem: SVGPathSeg, index: number): SVGPathSeg;
-    removeItem(index: number): SVGPathSeg;
-    replaceItem(newItem: SVGPathSeg, index: number): SVGPathSeg;
-}
-
-declare var SVGPathSegList: {
-    prototype: SVGPathSegList;
-    new(): SVGPathSegList;
-};
-
-interface SVGPathSegMovetoAbs extends SVGPathSeg {
-    x: number;
-    y: number;
-}
-
-declare var SVGPathSegMovetoAbs: {
-    prototype: SVGPathSegMovetoAbs;
-    new(): SVGPathSegMovetoAbs;
-};
-
-interface SVGPathSegMovetoRel extends SVGPathSeg {
-    x: number;
-    y: number;
-}
-
-declare var SVGPathSegMovetoRel: {
-    prototype: SVGPathSegMovetoRel;
-    new(): SVGPathSegMovetoRel;
-};
-
-interface SVGPatternElement extends SVGElement, SVGTests, SVGUnitTypes, SVGFitToViewBox, SVGURIReference {
-    readonly height: SVGAnimatedLength;
-    readonly patternContentUnits: SVGAnimatedEnumeration;
-    readonly patternTransform: SVGAnimatedTransformList;
-    readonly patternUnits: SVGAnimatedEnumeration;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGPatternElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGPatternElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGPatternElement: {
-    prototype: SVGPatternElement;
-    new(): SVGPatternElement;
-};
-
-interface SVGPoint {
-    x: number;
-    y: number;
-    matrixTransform(matrix: SVGMatrix): SVGPoint;
-}
-
-declare var SVGPoint: {
-    prototype: SVGPoint;
-    new(): SVGPoint;
-};
-
-interface SVGPointList {
-    readonly numberOfItems: number;
-    appendItem(newItem: SVGPoint): SVGPoint;
-    clear(): void;
-    getItem(index: number): SVGPoint;
-    initialize(newItem: SVGPoint): SVGPoint;
-    insertItemBefore(newItem: SVGPoint, index: number): SVGPoint;
-    removeItem(index: number): SVGPoint;
-    replaceItem(newItem: SVGPoint, index: number): SVGPoint;
-}
-
-declare var SVGPointList: {
-    prototype: SVGPointList;
-    new(): SVGPointList;
-};
-
-interface SVGPolygonElement extends SVGGraphicsElement, SVGAnimatedPoints {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGPolygonElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGPolygonElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGPolygonElement: {
-    prototype: SVGPolygonElement;
-    new(): SVGPolygonElement;
-};
-
-interface SVGPolylineElement extends SVGGraphicsElement, SVGAnimatedPoints {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGPolylineElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGPolylineElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGPolylineElement: {
-    prototype: SVGPolylineElement;
-    new(): SVGPolylineElement;
-};
-
-interface SVGPreserveAspectRatio {
-    align: number;
-    meetOrSlice: number;
-    readonly SVG_MEETORSLICE_MEET: number;
-    readonly SVG_MEETORSLICE_SLICE: number;
-    readonly SVG_MEETORSLICE_UNKNOWN: number;
-    readonly SVG_PRESERVEASPECTRATIO_NONE: number;
-    readonly SVG_PRESERVEASPECTRATIO_UNKNOWN: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMAXYMAX: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMAXYMID: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMAXYMIN: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMIDYMAX: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMIDYMID: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMIDYMIN: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMINYMAX: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMINYMID: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMINYMIN: number;
-}
-
-declare var SVGPreserveAspectRatio: {
-    prototype: SVGPreserveAspectRatio;
-    new(): SVGPreserveAspectRatio;
-    readonly SVG_MEETORSLICE_MEET: number;
-    readonly SVG_MEETORSLICE_SLICE: number;
-    readonly SVG_MEETORSLICE_UNKNOWN: number;
-    readonly SVG_PRESERVEASPECTRATIO_NONE: number;
-    readonly SVG_PRESERVEASPECTRATIO_UNKNOWN: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMAXYMAX: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMAXYMID: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMAXYMIN: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMIDYMAX: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMIDYMID: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMIDYMIN: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMINYMAX: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMINYMID: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMINYMIN: number;
-};
-
-interface SVGRadialGradientElement extends SVGGradientElement {
-    readonly cx: SVGAnimatedLength;
-    readonly cy: SVGAnimatedLength;
-    readonly fx: SVGAnimatedLength;
-    readonly fy: SVGAnimatedLength;
-    readonly r: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGRadialGradientElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGRadialGradientElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGRadialGradientElement: {
-    prototype: SVGRadialGradientElement;
-    new(): SVGRadialGradientElement;
-};
-
-interface SVGRect {
-    height: number;
-    width: number;
-    x: number;
-    y: number;
-}
-
-declare var SVGRect: {
-    prototype: SVGRect;
-    new(): SVGRect;
-};
-
-interface SVGRectElement extends SVGGraphicsElement {
-    readonly height: SVGAnimatedLength;
-    readonly rx: SVGAnimatedLength;
-    readonly ry: SVGAnimatedLength;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGRectElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGRectElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGRectElement: {
-    prototype: SVGRectElement;
-    new(): SVGRectElement;
-};
-
-interface SVGSVGElementEventMap extends SVGElementEventMap {
-    "SVGAbort": Event;
-    "SVGError": Event;
-    "resize": UIEvent;
-    "scroll": UIEvent;
-    "SVGUnload": Event;
-    "SVGZoom": SVGZoomEvent;
-}
-
-interface SVGSVGElement extends SVGGraphicsElement, DocumentEvent, SVGFitToViewBox, SVGZoomAndPan {
-    /** @deprecated */
-    contentScriptType: string;
-    /** @deprecated */
-    contentStyleType: string;
-    currentScale: number;
-    readonly currentTranslate: SVGPoint;
-    readonly height: SVGAnimatedLength;
-    onabort: ((this: SVGSVGElement, ev: Event) => any) | null;
-    onerror: ((this: SVGSVGElement, ev: Event) => any) | null;
-    onresize: ((this: SVGSVGElement, ev: UIEvent) => any) | null;
-    onscroll: ((this: SVGSVGElement, ev: UIEvent) => any) | null;
-    onunload: ((this: SVGSVGElement, ev: Event) => any) | null;
-    onzoom: ((this: SVGSVGElement, ev: SVGZoomEvent) => any) | null;
-    /** @deprecated */
-    readonly pixelUnitToMillimeterX: number;
-    /** @deprecated */
-    readonly pixelUnitToMillimeterY: number;
-    /** @deprecated */
-    readonly screenPixelToMillimeterX: number;
-    /** @deprecated */
-    readonly screenPixelToMillimeterY: number;
-    /** @deprecated */
-    readonly viewport: SVGRect;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-    checkEnclosure(element: SVGElement, rect: SVGRect): boolean;
-    checkIntersection(element: SVGElement, rect: SVGRect): boolean;
-    createSVGAngle(): SVGAngle;
-    createSVGLength(): SVGLength;
-    createSVGMatrix(): SVGMatrix;
-    createSVGNumber(): SVGNumber;
-    createSVGPoint(): SVGPoint;
-    createSVGRect(): SVGRect;
-    createSVGTransform(): SVGTransform;
-    createSVGTransformFromMatrix(matrix: SVGMatrix): SVGTransform;
-    deselectAll(): void;
-    /** @deprecated */
-    forceRedraw(): void;
-    getComputedStyle(elt: Element, pseudoElt?: string | null): CSSStyleDeclaration;
-    /** @deprecated */
-    getCurrentTime(): number;
-    getElementById(elementId: string): Element;
-    getEnclosureList(rect: SVGRect, referenceElement: SVGElement): NodeListOf<SVGCircleElement | SVGEllipseElement | SVGImageElement | SVGLineElement | SVGPathElement | SVGPolygonElement | SVGPolylineElement | SVGRectElement | SVGTextElement | SVGUseElement>;
-    getIntersectionList(rect: SVGRect, referenceElement: SVGElement): NodeListOf<SVGCircleElement | SVGEllipseElement | SVGImageElement | SVGLineElement | SVGPathElement | SVGPolygonElement | SVGPolylineElement | SVGRectElement | SVGTextElement | SVGUseElement>;
-    /** @deprecated */
-    pauseAnimations(): void;
-    /** @deprecated */
-    setCurrentTime(seconds: number): void;
-    /** @deprecated */
-    suspendRedraw(maxWaitMilliseconds: number): number;
-    /** @deprecated */
-    unpauseAnimations(): void;
-    /** @deprecated */
-    unsuspendRedraw(suspendHandleID: number): void;
-    /** @deprecated */
-    unsuspendRedrawAll(): void;
-    addEventListener<K extends keyof SVGSVGElementEventMap>(type: K, listener: (this: SVGSVGElement, ev: SVGSVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGSVGElementEventMap>(type: K, listener: (this: SVGSVGElement, ev: SVGSVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGSVGElement: {
-    prototype: SVGSVGElement;
-    new(): SVGSVGElement;
-};
-
-interface SVGScriptElement extends SVGElement, SVGURIReference {
-    type: string;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGScriptElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGScriptElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGScriptElement: {
-    prototype: SVGScriptElement;
-    new(): SVGScriptElement;
-};
-
-interface SVGStopElement extends SVGElement {
-    readonly offset: SVGAnimatedNumber;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGStopElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGStopElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGStopElement: {
-    prototype: SVGStopElement;
-    new(): SVGStopElement;
-};
-
-interface SVGStringList {
-    readonly numberOfItems: number;
-    appendItem(newItem: string): string;
-    clear(): void;
-    getItem(index: number): string;
-    initialize(newItem: string): string;
-    insertItemBefore(newItem: string, index: number): string;
-    removeItem(index: number): string;
-    replaceItem(newItem: string, index: number): string;
-}
-
-declare var SVGStringList: {
-    prototype: SVGStringList;
-    new(): SVGStringList;
-};
-
-interface SVGStylable {
-    className: any;
-}
-
-declare var SVGStylable: {
-    prototype: SVGStylable;
-    new(): SVGStylable;
-};
-
-interface SVGStyleElement extends SVGElement {
-    disabled: boolean;
-    media: string;
-    title: string;
-    type: string;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGStyleElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGStyleElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGStyleElement: {
-    prototype: SVGStyleElement;
-    new(): SVGStyleElement;
-};
-
-interface SVGSwitchElement extends SVGGraphicsElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGSwitchElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGSwitchElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGSwitchElement: {
-    prototype: SVGSwitchElement;
-    new(): SVGSwitchElement;
-};
-
-interface SVGSymbolElement extends SVGElement, SVGFitToViewBox {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGSymbolElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGSymbolElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGSymbolElement: {
-    prototype: SVGSymbolElement;
-    new(): SVGSymbolElement;
-};
-
-interface SVGTSpanElement extends SVGTextPositioningElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTSpanElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTSpanElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGTSpanElement: {
-    prototype: SVGTSpanElement;
-    new(): SVGTSpanElement;
-};
-
-interface SVGTests {
-    readonly requiredExtensions: SVGStringList;
-    /** @deprecated */
-    readonly requiredFeatures: SVGStringList;
-    readonly systemLanguage: SVGStringList;
-    /** @deprecated */
-    hasExtension(extension: string): boolean;
-}
-
-interface SVGTextContentElement extends SVGGraphicsElement {
-    readonly lengthAdjust: SVGAnimatedEnumeration;
-    readonly textLength: SVGAnimatedLength;
-    getCharNumAtPosition(point: SVGPoint): number;
-    getComputedTextLength(): number;
-    getEndPositionOfChar(charnum: number): SVGPoint;
-    getExtentOfChar(charnum: number): SVGRect;
-    getNumberOfChars(): number;
-    getRotationOfChar(charnum: number): number;
-    getStartPositionOfChar(charnum: number): SVGPoint;
-    getSubStringLength(charnum: number, nchars: number): number;
-    selectSubString(charnum: number, nchars: number): void;
-    readonly LENGTHADJUST_SPACING: number;
-    readonly LENGTHADJUST_SPACINGANDGLYPHS: number;
-    readonly LENGTHADJUST_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTextContentElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTextContentElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGTextContentElement: {
-    prototype: SVGTextContentElement;
-    new(): SVGTextContentElement;
-    readonly LENGTHADJUST_SPACING: number;
-    readonly LENGTHADJUST_SPACINGANDGLYPHS: number;
-    readonly LENGTHADJUST_UNKNOWN: number;
-};
-
-interface SVGTextElement extends SVGTextPositioningElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTextElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTextElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGTextElement: {
-    prototype: SVGTextElement;
-    new(): SVGTextElement;
-};
-
-interface SVGTextPathElement extends SVGTextContentElement, SVGURIReference {
-    readonly method: SVGAnimatedEnumeration;
-    readonly spacing: SVGAnimatedEnumeration;
-    readonly startOffset: SVGAnimatedLength;
-    readonly TEXTPATH_METHODTYPE_ALIGN: number;
-    readonly TEXTPATH_METHODTYPE_STRETCH: number;
-    readonly TEXTPATH_METHODTYPE_UNKNOWN: number;
-    readonly TEXTPATH_SPACINGTYPE_AUTO: number;
-    readonly TEXTPATH_SPACINGTYPE_EXACT: number;
-    readonly TEXTPATH_SPACINGTYPE_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTextPathElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTextPathElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGTextPathElement: {
-    prototype: SVGTextPathElement;
-    new(): SVGTextPathElement;
-    readonly TEXTPATH_METHODTYPE_ALIGN: number;
-    readonly TEXTPATH_METHODTYPE_STRETCH: number;
-    readonly TEXTPATH_METHODTYPE_UNKNOWN: number;
-    readonly TEXTPATH_SPACINGTYPE_AUTO: number;
-    readonly TEXTPATH_SPACINGTYPE_EXACT: number;
-    readonly TEXTPATH_SPACINGTYPE_UNKNOWN: number;
-};
-
-interface SVGTextPositioningElement extends SVGTextContentElement {
-    readonly dx: SVGAnimatedLengthList;
-    readonly dy: SVGAnimatedLengthList;
-    readonly rotate: SVGAnimatedNumberList;
-    readonly x: SVGAnimatedLengthList;
-    readonly y: SVGAnimatedLengthList;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTextPositioningElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTextPositioningElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGTextPositioningElement: {
-    prototype: SVGTextPositioningElement;
-    new(): SVGTextPositioningElement;
-};
-
-interface SVGTitleElement extends SVGElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTitleElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTitleElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGTitleElement: {
-    prototype: SVGTitleElement;
-    new(): SVGTitleElement;
-};
-
-interface SVGTransform {
-    readonly angle: number;
-    readonly matrix: SVGMatrix;
-    readonly type: number;
-    setMatrix(matrix: SVGMatrix): void;
-    setRotate(angle: number, cx: number, cy: number): void;
-    setScale(sx: number, sy: number): void;
-    setSkewX(angle: number): void;
-    setSkewY(angle: number): void;
-    setTranslate(tx: number, ty: number): void;
-    readonly SVG_TRANSFORM_MATRIX: number;
-    readonly SVG_TRANSFORM_ROTATE: number;
-    readonly SVG_TRANSFORM_SCALE: number;
-    readonly SVG_TRANSFORM_SKEWX: number;
-    readonly SVG_TRANSFORM_SKEWY: number;
-    readonly SVG_TRANSFORM_TRANSLATE: number;
-    readonly SVG_TRANSFORM_UNKNOWN: number;
-}
-
-declare var SVGTransform: {
-    prototype: SVGTransform;
-    new(): SVGTransform;
-    readonly SVG_TRANSFORM_MATRIX: number;
-    readonly SVG_TRANSFORM_ROTATE: number;
-    readonly SVG_TRANSFORM_SCALE: number;
-    readonly SVG_TRANSFORM_SKEWX: number;
-    readonly SVG_TRANSFORM_SKEWY: number;
-    readonly SVG_TRANSFORM_TRANSLATE: number;
-    readonly SVG_TRANSFORM_UNKNOWN: number;
-};
-
-interface SVGTransformList {
-    readonly numberOfItems: number;
-    appendItem(newItem: SVGTransform): SVGTransform;
-    clear(): void;
-    consolidate(): SVGTransform;
-    createSVGTransformFromMatrix(matrix: SVGMatrix): SVGTransform;
-    getItem(index: number): SVGTransform;
-    initialize(newItem: SVGTransform): SVGTransform;
-    insertItemBefore(newItem: SVGTransform, index: number): SVGTransform;
-    removeItem(index: number): SVGTransform;
-    replaceItem(newItem: SVGTransform, index: number): SVGTransform;
-}
-
-declare var SVGTransformList: {
-    prototype: SVGTransformList;
-    new(): SVGTransformList;
-};
-
-interface SVGURIReference {
-    readonly href: SVGAnimatedString;
-}
-
-interface SVGUnitTypes {
-    readonly SVG_UNIT_TYPE_OBJECTBOUNDINGBOX: number;
-    readonly SVG_UNIT_TYPE_UNKNOWN: number;
-    readonly SVG_UNIT_TYPE_USERSPACEONUSE: number;
-}
-declare var SVGUnitTypes: SVGUnitTypes;
-
-interface SVGUseElement extends SVGGraphicsElement, SVGURIReference {
-    readonly animatedInstanceRoot: SVGElementInstance | null;
-    readonly height: SVGAnimatedLength;
-    readonly instanceRoot: SVGElementInstance | null;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGUseElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGUseElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGUseElement: {
-    prototype: SVGUseElement;
-    new(): SVGUseElement;
-};
-
-interface SVGViewElement extends SVGElement, SVGFitToViewBox, SVGZoomAndPan {
-    /** @deprecated */
-    readonly viewTarget: SVGStringList;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGViewElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGViewElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGViewElement: {
-    prototype: SVGViewElement;
-    new(): SVGViewElement;
-};
-
-interface SVGZoomAndPan {
-    readonly zoomAndPan: number;
-}
-
-declare var SVGZoomAndPan: {
-    readonly SVG_ZOOMANDPAN_DISABLE: number;
-    readonly SVG_ZOOMANDPAN_MAGNIFY: number;
-    readonly SVG_ZOOMANDPAN_UNKNOWN: number;
-};
-
-interface SVGZoomEvent extends UIEvent {
-    readonly newScale: number;
-    readonly newTranslate: SVGPoint;
-    readonly previousScale: number;
-    readonly previousTranslate: SVGPoint;
-    readonly zoomRectScreen: SVGRect;
-}
-
-declare var SVGZoomEvent: {
-    prototype: SVGZoomEvent;
-    new(): SVGZoomEvent;
-};
-
-interface ScopedCredential {
-    readonly id: ArrayBuffer;
-    readonly type: ScopedCredentialType;
-}
-
-declare var ScopedCredential: {
-    prototype: ScopedCredential;
-    new(): ScopedCredential;
-};
-
-interface ScopedCredentialInfo {
-    readonly credential: ScopedCredential;
-    readonly publicKey: CryptoKey;
-}
-
-declare var ScopedCredentialInfo: {
-    prototype: ScopedCredentialInfo;
-    new(): ScopedCredentialInfo;
-};
-
-interface ScreenEventMap {
-    "MSOrientationChange": Event;
-}
-
-interface Screen extends EventTarget {
-    readonly availHeight: number;
-    readonly availWidth: number;
-    /** @deprecated */
-    bufferDepth: number;
-    readonly colorDepth: number;
-    readonly deviceXDPI: number;
-    readonly deviceYDPI: number;
-    readonly fontSmoothingEnabled: boolean;
-    readonly height: number;
-    readonly logicalXDPI: number;
-    readonly logicalYDPI: number;
-    readonly msOrientation: string;
-    onmsorientationchange: ((this: Screen, ev: Event) => any) | null;
-    readonly pixelDepth: number;
-    readonly systemXDPI: number;
-    readonly systemYDPI: number;
-    readonly width: number;
-    lockOrientation(orientations: OrientationLockType | OrientationLockType[]): boolean;
-    msLockOrientation(orientations: string | string[]): boolean;
-    msUnlockOrientation(): void;
-    unlockOrientation(): void;
-    addEventListener<K extends keyof ScreenEventMap>(type: K, listener: (this: Screen, ev: ScreenEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof ScreenEventMap>(type: K, listener: (this: Screen, ev: ScreenEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var Screen: {
-    prototype: Screen;
-    new(): Screen;
-};
-
-interface ScriptProcessorNodeEventMap {
-    "audioprocess": AudioProcessingEvent;
-}
-
-interface ScriptProcessorNode extends AudioNode {
-    /** @deprecated */
-    readonly bufferSize: number;
-    /** @deprecated */
-    onaudioprocess: ((this: ScriptProcessorNode, ev: AudioProcessingEvent) => any) | null;
-    addEventListener<K extends keyof ScriptProcessorNodeEventMap>(type: K, listener: (this: ScriptProcessorNode, ev: ScriptProcessorNodeEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof ScriptProcessorNodeEventMap>(type: K, listener: (this: ScriptProcessorNode, ev: ScriptProcessorNodeEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var ScriptProcessorNode: {
-    prototype: ScriptProcessorNode;
-    new(): ScriptProcessorNode;
-};
-
-interface ScrollIntoViewOptions extends ScrollOptions {
-    block?: ScrollLogicalPosition;
-    inline?: ScrollLogicalPosition;
-}
-
-interface ScrollOptions {
-    behavior?: ScrollBehavior;
-}
-
-interface ScrollToOptions extends ScrollOptions {
-    left?: number;
-    top?: number;
-}
-
-interface SecurityPolicyViolationEvent extends Event {
-    readonly blockedURI: string;
-    readonly columnNumber: number;
-    readonly documentURI: string;
-    readonly effectiveDirective: string;
-    readonly lineNumber: number;
-    readonly originalPolicy: string;
-    readonly referrer: string;
-    readonly sourceFile: string;
-    readonly statusCode: number;
-    readonly violatedDirective: string;
-}
-
-declare var SecurityPolicyViolationEvent: {
-    prototype: SecurityPolicyViolationEvent;
-    new(type: string, eventInitDict?: SecurityPolicyViolationEventInit): SecurityPolicyViolationEvent;
-};
-
-interface Selection {
-    readonly anchorNode: Node;
-    readonly anchorOffset: number;
-    readonly baseNode: Node;
-    readonly baseOffset: number;
-    readonly extentNode: Node;
-    readonly extentOffset: number;
-    readonly focusNode: Node;
-    readonly focusOffset: number;
-    readonly isCollapsed: boolean;
-    readonly rangeCount: number;
-    readonly type: string;
-    addRange(range: Range): void;
-    collapse(parentNode: Node, offset: number): void;
-    collapseToEnd(): void;
-    collapseToStart(): void;
-    containsNode(node: Node, partlyContained: boolean): boolean;
-    deleteFromDocument(): void;
-    empty(): void;
-    extend(newNode: Node, offset: number): void;
-    getRangeAt(index: number): Range;
-    removeAllRanges(): void;
-    removeRange(range: Range): void;
-    selectAllChildren(parentNode: Node): void;
-    setBaseAndExtent(baseNode: Node, baseOffset: number, extentNode: Node, extentOffset: number): void;
-    setPosition(parentNode: Node, offset: number): void;
-    toString(): string;
-}
-
-declare var Selection: {
-    prototype: Selection;
-    new(): Selection;
-};
-
-interface ServiceUIFrameContext {
-    getCachedFrameMessage(key: string): string;
-    postFrameMessage(key: string, data: string): void;
-}
-declare var ServiceUIFrameContext: ServiceUIFrameContext;
-
-interface ServiceWorkerEventMap extends AbstractWorkerEventMap {
-    "statechange": Event;
-}
-
-interface ServiceWorker extends EventTarget, AbstractWorker {
-    onstatechange: ((this: ServiceWorker, ev: Event) => any) | null;
-    readonly scriptURL: string;
-    readonly state: ServiceWorkerState;
-    postMessage(message: any, transfer?: any[]): void;
-    addEventListener<K extends keyof ServiceWorkerEventMap>(type: K, listener: (this: ServiceWorker, ev: ServiceWorkerEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof ServiceWorkerEventMap>(type: K, listener: (this: ServiceWorker, ev: ServiceWorkerEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var ServiceWorker: {
-    prototype: ServiceWorker;
-    new(): ServiceWorker;
-};
-
-interface ServiceWorkerContainerEventMap {
-    "controllerchange": Event;
-    "message": ServiceWorkerMessageEvent;
-    "messageerror": MessageEvent;
-}
-
-interface ServiceWorkerContainer extends EventTarget {
-    readonly controller: ServiceWorker | null;
-    oncontrollerchange: ((this: ServiceWorkerContainer, ev: Event) => any) | null;
-    onmessage: ((this: ServiceWorkerContainer, ev: ServiceWorkerMessageEvent) => any) | null;
-    onmessageerror: ((this: ServiceWorkerContainer, ev: MessageEvent) => any) | null;
-    readonly ready: Promise<ServiceWorkerRegistration>;
-    getRegistration(clientURL?: string): Promise<ServiceWorkerRegistration | undefined>;
-    getRegistrations(): Promise<ServiceWorkerRegistration[]>;
-    register(scriptURL: string, options?: RegistrationOptions): Promise<ServiceWorkerRegistration>;
-    startMessages(): void;
-    addEventListener<K extends keyof ServiceWorkerContainerEventMap>(type: K, listener: (this: ServiceWorkerContainer, ev: ServiceWorkerContainerEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof ServiceWorkerContainerEventMap>(type: K, listener: (this: ServiceWorkerContainer, ev: ServiceWorkerContainerEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var ServiceWorkerContainer: {
-    prototype: ServiceWorkerContainer;
-    new(): ServiceWorkerContainer;
-};
-
-interface ServiceWorkerMessageEvent extends Event {
-    readonly data: any;
-    readonly lastEventId: string;
-    readonly origin: string;
-    readonly ports: ReadonlyArray<MessagePort> | null;
-    readonly source: ServiceWorker | MessagePort | null;
-}
-
-declare var ServiceWorkerMessageEvent: {
-    prototype: ServiceWorkerMessageEvent;
-    new(type: string, eventInitDict?: ServiceWorkerMessageEventInit): ServiceWorkerMessageEvent;
-};
-
-interface ServiceWorkerRegistrationEventMap {
-    "updatefound": Event;
-}
-
-interface ServiceWorkerRegistration extends EventTarget {
-    readonly active: ServiceWorker | null;
-    readonly installing: ServiceWorker | null;
-    onupdatefound: ((this: ServiceWorkerRegistration, ev: Event) => any) | null;
-    readonly pushManager: PushManager;
-    readonly scope: string;
-    readonly sync: SyncManager;
-    readonly waiting: ServiceWorker | null;
-    getNotifications(filter?: GetNotificationOptions): Promise<Notification[]>;
-    showNotification(title: string, options?: NotificationOptions): Promise<void>;
-    unregister(): Promise<boolean>;
-    update(): Promise<void>;
-    addEventListener<K extends keyof ServiceWorkerRegistrationEventMap>(type: K, listener: (this: ServiceWorkerRegistration, ev: ServiceWorkerRegistrationEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof ServiceWorkerRegistrationEventMap>(type: K, listener: (this: ServiceWorkerRegistration, ev: ServiceWorkerRegistrationEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var ServiceWorkerRegistration: {
-    prototype: ServiceWorkerRegistration;
-    new(): ServiceWorkerRegistration;
-};
-
-interface ShadowRoot extends DocumentOrShadowRoot, DocumentFragment {
-    readonly host: Element;
-    innerHTML: string;
-}
-
-interface ShadowRootInit {
-    delegatesFocus?: boolean;
-    mode: "open" | "closed";
-}
-
-interface SourceBuffer extends EventTarget {
-    appendWindowEnd: number;
-    appendWindowStart: number;
-    readonly audioTracks: AudioTrackList;
-    readonly buffered: TimeRanges;
-    mode: AppendMode;
-    readonly textTracks: TextTrackList;
-    timestampOffset: number;
-    readonly updating: boolean;
-    readonly videoTracks: VideoTrackList;
-    abort(): void;
-    appendBuffer(data: ArrayBuffer | Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | null): void;
-    appendStream(stream: MSStream, maxSize?: number): void;
-    remove(start: number, end: number): void;
-}
-
-declare var SourceBuffer: {
-    prototype: SourceBuffer;
-    new(): SourceBuffer;
-};
-
-interface SourceBufferList extends EventTarget {
-    readonly length: number;
-    item(index: number): SourceBuffer;
-    [index: number]: SourceBuffer;
-}
-
-declare var SourceBufferList: {
-    prototype: SourceBufferList;
-    new(): SourceBufferList;
-};
-
-interface SpeechSynthesisEventMap {
-    "voiceschanged": Event;
-}
-
-interface SpeechSynthesis extends EventTarget {
-    onvoiceschanged: ((this: SpeechSynthesis, ev: Event) => any) | null;
-    readonly paused: boolean;
-    readonly pending: boolean;
-    readonly speaking: boolean;
-    cancel(): void;
-    getVoices(): SpeechSynthesisVoice[];
-    pause(): void;
-    resume(): void;
-    speak(utterance: SpeechSynthesisUtterance): void;
-    addEventListener<K extends keyof SpeechSynthesisEventMap>(type: K, listener: (this: SpeechSynthesis, ev: SpeechSynthesisEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SpeechSynthesisEventMap>(type: K, listener: (this: SpeechSynthesis, ev: SpeechSynthesisEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SpeechSynthesis: {
-    prototype: SpeechSynthesis;
-    new(): SpeechSynthesis;
-};
-
-interface SpeechSynthesisEvent extends Event {
-    readonly charIndex: number;
-    readonly charLength: number;
-    readonly elapsedTime: number;
-    readonly name: string;
-    readonly utterance: SpeechSynthesisUtterance;
-}
-
-declare var SpeechSynthesisEvent: {
-    prototype: SpeechSynthesisEvent;
-    new(type: string, eventInitDict?: SpeechSynthesisEventInit): SpeechSynthesisEvent;
-};
-
-interface SpeechSynthesisUtteranceEventMap {
-    "boundary": Event;
-    "end": Event;
-    "error": Event;
-    "mark": Event;
-    "pause": Event;
-    "resume": Event;
-    "start": Event;
-}
-
-interface SpeechSynthesisUtterance extends EventTarget {
-    lang: string;
-    onboundary: ((this: SpeechSynthesisUtterance, ev: Event) => any) | null;
-    onend: ((this: SpeechSynthesisUtterance, ev: Event) => any) | null;
-    onerror: ((this: SpeechSynthesisUtterance, ev: Event) => any) | null;
-    onmark: ((this: SpeechSynthesisUtterance, ev: Event) => any) | null;
-    onpause: ((this: SpeechSynthesisUtterance, ev: Event) => any) | null;
-    onresume: ((this: SpeechSynthesisUtterance, ev: Event) => any) | null;
-    onstart: ((this: SpeechSynthesisUtterance, ev: Event) => any) | null;
-    pitch: number;
-    rate: number;
-    text: string;
-    voice: SpeechSynthesisVoice;
-    volume: number;
-    addEventListener<K extends keyof SpeechSynthesisUtteranceEventMap>(type: K, listener: (this: SpeechSynthesisUtterance, ev: SpeechSynthesisUtteranceEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SpeechSynthesisUtteranceEventMap>(type: K, listener: (this: SpeechSynthesisUtterance, ev: SpeechSynthesisUtteranceEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SpeechSynthesisUtterance: {
-    prototype: SpeechSynthesisUtterance;
-    new(): SpeechSynthesisUtterance;
-    new(text: string): SpeechSynthesisUtterance;
-};
-
-interface SpeechSynthesisVoice {
-    readonly default: boolean;
-    readonly lang: string;
-    readonly localService: boolean;
-    readonly name: string;
-    readonly voiceURI: string;
-}
-
-declare var SpeechSynthesisVoice: {
-    prototype: SpeechSynthesisVoice;
-    new(): SpeechSynthesisVoice;
-};
-
-interface StereoPannerNode extends AudioNode {
-    readonly pan: AudioParam;
-}
-
-declare var StereoPannerNode: {
-    prototype: StereoPannerNode;
-    new(): StereoPannerNode;
-};
-
-interface Storage {
-    readonly length: number;
-    clear(): void;
-    getItem(key: string): string | null;
-    key(index: number): string | null;
-    removeItem(key: string): void;
-    setItem(key: string, value: string): void;
-    [key: string]: any;
-}
-
-declare var Storage: {
-    prototype: Storage;
-    new(): Storage;
-};
-
-interface StorageEvent extends Event {
-    readonly key: string | null;
-    readonly newValue: string | null;
-    readonly oldValue: string | null;
-    readonly storageArea: Storage | null;
-    readonly url: string;
-}
-
-declare var StorageEvent: {
-    prototype: StorageEvent;
-    new (type: string, eventInitDict?: StorageEventInit): StorageEvent;
-};
-
-interface StorageEventInit extends EventInit {
-    key?: string;
-    newValue?: string;
-    oldValue?: string;
-    storageArea?: Storage;
-    url: string;
-}
-
-interface StyleMedia {
-    readonly type: string;
-    matchMedium(mediaquery: string): boolean;
-}
-
-declare var StyleMedia: {
-    prototype: StyleMedia;
-    new(): StyleMedia;
-};
-
-interface StyleSheet {
-    disabled: boolean;
-    readonly href: string | null;
-    readonly media: MediaList;
-    readonly ownerNode: Node;
-    readonly parentStyleSheet: StyleSheet | null;
-    readonly title: string | null;
-    readonly type: string;
-}
-
-declare var StyleSheet: {
-    prototype: StyleSheet;
-    new(): StyleSheet;
-};
-
-interface StyleSheetList {
-    readonly length: number;
-    item(index: number): StyleSheet | null;
-    [index: number]: StyleSheet;
-}
-
-declare var StyleSheetList: {
-    prototype: StyleSheetList;
-    new(): StyleSheetList;
-};
-
-interface SubtleCrypto {
-    decrypt(algorithm: string | RsaOaepParams | AesCtrParams | AesCbcParams | AesCmacParams | AesGcmParams | AesCfbParams, key: CryptoKey, data: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer): PromiseLike<ArrayBuffer>;
-    deriveBits(algorithm: string | EcdhKeyDeriveParams | DhKeyDeriveParams | ConcatParams | HkdfCtrParams | Pbkdf2Params, baseKey: CryptoKey, length: number): PromiseLike<ArrayBuffer>;
-    deriveKey(algorithm: string | EcdhKeyDeriveParams | DhKeyDeriveParams | ConcatParams | HkdfCtrParams | Pbkdf2Params, baseKey: CryptoKey, derivedKeyType: string | AesDerivedKeyParams | HmacImportParams | ConcatParams | HkdfCtrParams | Pbkdf2Params, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKey>;
-    digest(algorithm: string | Algorithm, data: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer): PromiseLike<ArrayBuffer>;
-    encrypt(algorithm: string | RsaOaepParams | AesCtrParams | AesCbcParams | AesCmacParams | AesGcmParams | AesCfbParams, key: CryptoKey, data: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer): PromiseLike<ArrayBuffer>;
-    exportKey(format: "jwk", key: CryptoKey): PromiseLike<JsonWebKey>;
-    exportKey(format: "raw" | "pkcs8" | "spki", key: CryptoKey): PromiseLike<ArrayBuffer>;
-    exportKey(format: string, key: CryptoKey): PromiseLike<JsonWebKey | ArrayBuffer>;
-    generateKey(algorithm: string, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKeyPair | CryptoKey>;
-    generateKey(algorithm: RsaHashedKeyGenParams | EcKeyGenParams | DhKeyGenParams, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKeyPair>;
-    generateKey(algorithm: AesKeyGenParams | HmacKeyGenParams | Pbkdf2Params, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKey>;
-    importKey(format: "jwk", keyData: JsonWebKey, algorithm: string | RsaHashedImportParams | EcKeyImportParams | HmacImportParams | DhImportKeyParams, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKey>;
-    importKey(format: "raw" | "pkcs8" | "spki", keyData: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer, algorithm: string | RsaHashedImportParams | EcKeyImportParams | HmacImportParams | DhImportKeyParams, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKey>;
-    importKey(format: string, keyData: JsonWebKey | Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer, algorithm: string | RsaHashedImportParams | EcKeyImportParams | HmacImportParams | DhImportKeyParams, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKey>;
-    sign(algorithm: string | RsaPssParams | EcdsaParams | AesCmacParams, key: CryptoKey, data: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer): PromiseLike<ArrayBuffer>;
-    unwrapKey(format: string, wrappedKey: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer, unwrappingKey: CryptoKey, unwrapAlgorithm: string | Algorithm, unwrappedKeyAlgorithm: string | Algorithm, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKey>;
-    verify(algorithm: string | RsaPssParams | EcdsaParams | AesCmacParams, key: CryptoKey, signature: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer, data: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer): PromiseLike<boolean>;
-    wrapKey(format: string, key: CryptoKey, wrappingKey: CryptoKey, wrapAlgorithm: string | Algorithm): PromiseLike<ArrayBuffer>;
-}
-
-declare var SubtleCrypto: {
-    prototype: SubtleCrypto;
-    new(): SubtleCrypto;
-};
-
-interface SyncManager {
-    getTags(): Promise<string[]>;
-    register(tag: string): Promise<void>;
-}
-
-declare var SyncManager: {
-    prototype: SyncManager;
-    new(): SyncManager;
-};
-
-interface Text extends CharacterData {
-    readonly assignedSlot: HTMLSlotElement | null;
-    readonly wholeText: string;
-    splitText(offset: number): Text;
-}
-
-declare var Text: {
-    prototype: Text;
-    new(data?: string): Text;
-};
-
-interface TextDecoder {
-    readonly encoding: string;
-    readonly fatal: boolean;
-    readonly ignoreBOM: boolean;
-    decode(input?: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null, options?: TextDecodeOptions): string;
-}
-
-declare var TextDecoder: {
-    prototype: TextDecoder;
-    new(label?: string, options?: TextDecoderOptions): TextDecoder;
-};
-
-interface TextEncoder {
-    readonly encoding: string;
-    encode(input?: string): Uint8Array;
-}
-
-declare var TextEncoder: {
-    prototype: TextEncoder;
-    new(): TextEncoder;
-};
-
-interface TextEvent extends UIEvent {
-    readonly data: string;
-    initTextEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, dataArg: string, inputMethod: number, locale: string): void;
-    readonly DOM_INPUT_METHOD_DROP: number;
-    readonly DOM_INPUT_METHOD_HANDWRITING: number;
-    readonly DOM_INPUT_METHOD_IME: number;
-    readonly DOM_INPUT_METHOD_KEYBOARD: number;
-    readonly DOM_INPUT_METHOD_MULTIMODAL: number;
-    readonly DOM_INPUT_METHOD_OPTION: number;
-    readonly DOM_INPUT_METHOD_PASTE: number;
-    readonly DOM_INPUT_METHOD_SCRIPT: number;
-    readonly DOM_INPUT_METHOD_UNKNOWN: number;
-    readonly DOM_INPUT_METHOD_VOICE: number;
-}
-
-declare var TextEvent: {
-    prototype: TextEvent;
-    new(): TextEvent;
-    readonly DOM_INPUT_METHOD_DROP: number;
-    readonly DOM_INPUT_METHOD_HANDWRITING: number;
-    readonly DOM_INPUT_METHOD_IME: number;
-    readonly DOM_INPUT_METHOD_KEYBOARD: number;
-    readonly DOM_INPUT_METHOD_MULTIMODAL: number;
-    readonly DOM_INPUT_METHOD_OPTION: number;
-    readonly DOM_INPUT_METHOD_PASTE: number;
-    readonly DOM_INPUT_METHOD_SCRIPT: number;
-    readonly DOM_INPUT_METHOD_UNKNOWN: number;
-    readonly DOM_INPUT_METHOD_VOICE: number;
-};
-
-interface TextMetrics {
-    readonly width: number;
-}
-
-declare var TextMetrics: {
-    prototype: TextMetrics;
-    new(): TextMetrics;
-};
-
-interface TextTrackEventMap {
-    "cuechange": Event;
-    "error": Event;
-    "load": Event;
-}
-
-interface TextTrack extends EventTarget {
-    readonly activeCues: TextTrackCueList;
-    readonly cues: TextTrackCueList;
-    readonly inBandMetadataTrackDispatchType: string;
-    readonly kind: string;
-    readonly label: string;
-    readonly language: string;
-    mode: TextTrackMode | number;
-    oncuechange: ((this: TextTrack, ev: Event) => any) | null;
-    onerror: ((this: TextTrack, ev: Event) => any) | null;
-    onload: ((this: TextTrack, ev: Event) => any) | null;
-    readonly readyState: number;
-    addCue(cue: TextTrackCue): void;
-    removeCue(cue: TextTrackCue): void;
-    readonly DISABLED: number;
-    readonly ERROR: number;
-    readonly HIDDEN: number;
-    readonly LOADED: number;
-    readonly LOADING: number;
-    readonly NONE: number;
-    readonly SHOWING: number;
-    addEventListener<K extends keyof TextTrackEventMap>(type: K, listener: (this: TextTrack, ev: TextTrackEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof TextTrackEventMap>(type: K, listener: (this: TextTrack, ev: TextTrackEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var TextTrack: {
-    prototype: TextTrack;
-    new(): TextTrack;
-    readonly DISABLED: number;
-    readonly ERROR: number;
-    readonly HIDDEN: number;
-    readonly LOADED: number;
-    readonly LOADING: number;
-    readonly NONE: number;
-    readonly SHOWING: number;
-};
-
-interface TextTrackCueEventMap {
-    "enter": Event;
-    "exit": Event;
-}
-
-interface TextTrackCue extends EventTarget {
-    endTime: number;
-    id: string;
-    onenter: ((this: TextTrackCue, ev: Event) => any) | null;
-    onexit: ((this: TextTrackCue, ev: Event) => any) | null;
-    pauseOnExit: boolean;
-    startTime: number;
-    text: string;
-    readonly track: TextTrack;
-    getCueAsHTML(): DocumentFragment;
-    addEventListener<K extends keyof TextTrackCueEventMap>(type: K, listener: (this: TextTrackCue, ev: TextTrackCueEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof TextTrackCueEventMap>(type: K, listener: (this: TextTrackCue, ev: TextTrackCueEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var TextTrackCue: {
-    prototype: TextTrackCue;
-    new(startTime: number, endTime: number, text: string): TextTrackCue;
-};
-
-interface TextTrackCueList {
-    readonly length: number;
-    getCueById(id: string): TextTrackCue;
-    item(index: number): TextTrackCue;
-    [index: number]: TextTrackCue;
-}
-
-declare var TextTrackCueList: {
-    prototype: TextTrackCueList;
-    new(): TextTrackCueList;
-};
-
-interface TextTrackListEventMap {
-    "addtrack": TrackEvent;
-}
-
-interface TextTrackList extends EventTarget {
-    readonly length: number;
-    onaddtrack: ((this: TextTrackList, ev: TrackEvent) => any) | null;
-    item(index: number): TextTrack;
-    addEventListener<K extends keyof TextTrackListEventMap>(type: K, listener: (this: TextTrackList, ev: TextTrackListEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof TextTrackListEventMap>(type: K, listener: (this: TextTrackList, ev: TextTrackListEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-    [index: number]: TextTrack;
-}
-
-declare var TextTrackList: {
-    prototype: TextTrackList;
-    new(): TextTrackList;
-};
-
-interface TimeRanges {
-    readonly length: number;
-    end(index: number): number;
-    start(index: number): number;
-}
-
-declare var TimeRanges: {
-    prototype: TimeRanges;
-    new(): TimeRanges;
-};
-
-interface Touch {
-    readonly clientX: number;
-    readonly clientY: number;
-    readonly identifier: number;
-    readonly pageX: number;
-    readonly pageY: number;
-    readonly screenX: number;
-    readonly screenY: number;
-    readonly target: EventTarget;
-}
-
-declare var Touch: {
-    prototype: Touch;
-    new(): Touch;
-};
-
-interface TouchEvent extends UIEvent {
-    readonly altKey: boolean;
-    readonly changedTouches: TouchList;
-    readonly charCode: number;
-    readonly ctrlKey: boolean;
-    readonly keyCode: number;
-    readonly metaKey: boolean;
-    readonly shiftKey: boolean;
-    readonly targetTouches: TouchList;
-    readonly touches: TouchList;
-    /** @deprecated */
-    readonly which: number;
-}
-
-declare var TouchEvent: {
-    prototype: TouchEvent;
-    new(type: string, touchEventInit?: TouchEventInit): TouchEvent;
-};
-
-interface TouchEventInit extends EventModifierInit {
-    changedTouches?: Touch[];
-    targetTouches?: Touch[];
-    touches?: Touch[];
-}
-
-interface TouchList {
-    readonly length: number;
-    item(index: number): Touch | null;
-    [index: number]: Touch;
-}
-
-declare var TouchList: {
-    prototype: TouchList;
-    new(): TouchList;
-};
-
-interface TrackEvent extends Event {
-    readonly track: VideoTrack | AudioTrack | TextTrack | null;
-}
-
-declare var TrackEvent: {
-    prototype: TrackEvent;
-    new(typeArg: string, eventInitDict?: TrackEventInit): TrackEvent;
-};
-
-interface TransitionEvent extends Event {
-    readonly elapsedTime: number;
-    readonly propertyName: string;
-    initTransitionEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, propertyNameArg: string, elapsedTimeArg: number): void;
-}
-
-declare var TransitionEvent: {
-    prototype: TransitionEvent;
-    new(typeArg: string, eventInitDict?: TransitionEventInit): TransitionEvent;
-};
-
-interface TreeWalker {
-    currentNode: Node;
-    /** @deprecated */
-    readonly expandEntityReferences: boolean;
-    readonly filter: NodeFilter | null;
-    readonly root: Node;
-    readonly whatToShow: number;
-    firstChild(): Node | null;
-    lastChild(): Node | null;
-    nextNode(): Node | null;
-    nextSibling(): Node | null;
-    parentNode(): Node | null;
-    previousNode(): Node | null;
-    previousSibling(): Node | null;
-}
-
-declare var TreeWalker: {
-    prototype: TreeWalker;
-    new(): TreeWalker;
-};
-
-interface UIEvent extends Event {
-    readonly detail: number;
-    readonly view: Window;
-    initUIEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number): void;
-}
-
-declare var UIEvent: {
-    prototype: UIEvent;
-    new(typeArg: string, eventInitDict?: UIEventInit): UIEvent;
-};
-
-interface URL {
-    hash: string;
-    host: string;
-    hostname: string;
-    href: string;
-    readonly origin: string;
-    password: string;
-    pathname: string;
-    port: string;
-    protocol: string;
-    search: string;
-    readonly searchParams: URLSearchParams;
-    username: string;
-    toString(): string;
-}
-
-declare var URL: {
-    prototype: URL;
-    new(url: string, base?: string | URL): URL;
-    createObjectURL(object: any, options?: ObjectURLOptions): string;
-    revokeObjectURL(url: string): void;
-};
-
-interface URLSearchParams {
-    /**
-     * Appends a specified key/value pair as a new search parameter.
-     */
-    append(name: string, value: string): void;
-    /**
-     * Deletes the given search parameter, and its associated value, from the list of all search parameters.
-     */
-    delete(name: string): void;
-    /**
-     * Returns the first value associated to the given search parameter.
-     */
-    get(name: string): string | null;
-    /**
-     * Returns all the values association with a given search parameter.
-     */
-    getAll(name: string): string[];
-    /**
-     * Returns a Boolean indicating if such a search parameter exists.
-     */
-    has(name: string): boolean;
-    /**
-     * Sets the value associated to a given search parameter to the given value. If there were several values, delete the others.
-     */
-    set(name: string, value: string): void;
-}
-
-declare var URLSearchParams: {
-    prototype: URLSearchParams;
-    new (init?: string | URLSearchParams): URLSearchParams;
-};
-
-interface VRDisplay extends EventTarget {
-    readonly capabilities: VRDisplayCapabilities;
-    depthFar: number;
-    depthNear: number;
-    readonly displayId: number;
-    readonly displayName: string;
-    readonly isConnected: boolean;
-    readonly isPresenting: boolean;
-    readonly stageParameters: VRStageParameters | null;
-    cancelAnimationFrame(handle: number): void;
-    exitPresent(): Promise<void>;
-    getEyeParameters(whichEye: string): VREyeParameters;
-    getFrameData(frameData: VRFrameData): boolean;
-    getLayers(): VRLayer[];
-    /** @deprecated */
-    getPose(): VRPose;
-    requestAnimationFrame(callback: FrameRequestCallback): number;
-    requestPresent(layers: VRLayer[]): Promise<void>;
-    resetPose(): void;
-    submitFrame(pose?: VRPose): void;
-}
-
-declare var VRDisplay: {
-    prototype: VRDisplay;
-    new(): VRDisplay;
-};
-
-interface VRDisplayCapabilities {
-    readonly canPresent: boolean;
-    readonly hasExternalDisplay: boolean;
-    readonly hasOrientation: boolean;
-    readonly hasPosition: boolean;
-    readonly maxLayers: number;
-}
-
-declare var VRDisplayCapabilities: {
-    prototype: VRDisplayCapabilities;
-    new(): VRDisplayCapabilities;
-};
-
-interface VRDisplayEvent extends Event {
-    readonly display: VRDisplay;
-    readonly reason: VRDisplayEventReason | null;
-}
-
-declare var VRDisplayEvent: {
-    prototype: VRDisplayEvent;
-    new(type: string, eventInitDict: VRDisplayEventInit): VRDisplayEvent;
-};
-
-interface VREyeParameters {
-    /** @deprecated */
-    readonly fieldOfView: VRFieldOfView;
-    readonly offset: Float32Array;
-    readonly renderHeight: number;
-    readonly renderWidth: number;
-}
-
-declare var VREyeParameters: {
-    prototype: VREyeParameters;
-    new(): VREyeParameters;
-};
-
-interface VRFieldOfView {
-    readonly downDegrees: number;
-    readonly leftDegrees: number;
-    readonly rightDegrees: number;
-    readonly upDegrees: number;
-}
-
-declare var VRFieldOfView: {
-    prototype: VRFieldOfView;
-    new(): VRFieldOfView;
-};
-
-interface VRFrameData {
-    readonly leftProjectionMatrix: Float32Array;
-    readonly leftViewMatrix: Float32Array;
-    readonly pose: VRPose;
-    readonly rightProjectionMatrix: Float32Array;
-    readonly rightViewMatrix: Float32Array;
-    readonly timestamp: number;
-}
-
-declare var VRFrameData: {
-    prototype: VRFrameData;
-    new(): VRFrameData;
-};
-
-interface VRPose {
-    readonly angularAcceleration: Float32Array | null;
-    readonly angularVelocity: Float32Array | null;
-    readonly linearAcceleration: Float32Array | null;
-    readonly linearVelocity: Float32Array | null;
-    readonly orientation: Float32Array | null;
-    readonly position: Float32Array | null;
-    readonly timestamp: number;
-}
-
-declare var VRPose: {
-    prototype: VRPose;
-    new(): VRPose;
-};
-
-interface ValidityState {
-    readonly badInput: boolean;
-    readonly customError: boolean;
-    readonly patternMismatch: boolean;
-    readonly rangeOverflow: boolean;
-    readonly rangeUnderflow: boolean;
-    readonly stepMismatch: boolean;
-    readonly tooLong: boolean;
-    readonly tooShort: boolean;
-    readonly typeMismatch: boolean;
-    readonly valid: boolean;
-    readonly valueMissing: boolean;
-}
-
-declare var ValidityState: {
-    prototype: ValidityState;
-    new(): ValidityState;
-};
-
-interface VideoPlaybackQuality {
-    readonly corruptedVideoFrames: number;
-    readonly creationTime: number;
-    readonly droppedVideoFrames: number;
-    readonly totalFrameDelay: number;
-    readonly totalVideoFrames: number;
-}
-
-declare var VideoPlaybackQuality: {
-    prototype: VideoPlaybackQuality;
-    new(): VideoPlaybackQuality;
-};
-
-interface VideoTrack {
-    readonly id: string;
-    kind: string;
-    readonly label: string;
-    language: string;
-    selected: boolean;
-    readonly sourceBuffer: SourceBuffer;
-}
-
-declare var VideoTrack: {
-    prototype: VideoTrack;
-    new(): VideoTrack;
-};
-
-interface VideoTrackListEventMap {
-    "addtrack": TrackEvent;
-    "change": Event;
-    "removetrack": TrackEvent;
-}
-
-interface VideoTrackList extends EventTarget {
-    readonly length: number;
-    onaddtrack: ((this: VideoTrackList, ev: TrackEvent) => any) | null;
-    onchange: ((this: VideoTrackList, ev: Event) => any) | null;
-    onremovetrack: ((this: VideoTrackList, ev: TrackEvent) => any) | null;
-    readonly selectedIndex: number;
-    getTrackById(id: string): VideoTrack | null;
-    item(index: number): VideoTrack;
-    addEventListener<K extends keyof VideoTrackListEventMap>(type: K, listener: (this: VideoTrackList, ev: VideoTrackListEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof VideoTrackListEventMap>(type: K, listener: (this: VideoTrackList, ev: VideoTrackListEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-    [index: number]: VideoTrack;
-}
-
-declare var VideoTrackList: {
-    prototype: VideoTrackList;
-    new(): VideoTrackList;
-};
-
-interface WEBGL_color_buffer_float {
-    readonly FRAMEBUFFER_ATTACHMENT_COMPONENT_TYPE_EXT: number;
-    readonly RGB32F_EXT: number;
-    readonly RGBA32F_EXT: number;
-    readonly UNSIGNED_NORMALIZED_EXT: number;
-}
-
-interface WEBGL_compressed_texture_astc {
-    readonly COMPRESSED_RGBA_ASTC_10x10_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_10x5_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_10x6_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_10x8_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_12x10_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_12x12_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_4x4_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_5x4_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_5x5_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_6x5_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_6x6_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_8x5_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_8x6_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_8x8_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_10x10_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_10x5_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_10x6_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_10x8_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_12x10_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_12x12_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_4x4_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_5x4_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_5x5_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_6x5_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_6x6_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_8x5_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_8x6_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_8x8_KHR: number;
-    getSupportedProfiles(): string[];
-}
-
-interface WEBGL_compressed_texture_s3tc {
-    readonly COMPRESSED_RGBA_S3TC_DXT1_EXT: number;
-    readonly COMPRESSED_RGBA_S3TC_DXT3_EXT: number;
-    readonly COMPRESSED_RGBA_S3TC_DXT5_EXT: number;
-    readonly COMPRESSED_RGB_S3TC_DXT1_EXT: number;
-}
-
-declare var WEBGL_compressed_texture_s3tc: {
-    prototype: WEBGL_compressed_texture_s3tc;
-    new(): WEBGL_compressed_texture_s3tc;
-    readonly COMPRESSED_RGBA_S3TC_DXT1_EXT: number;
-    readonly COMPRESSED_RGBA_S3TC_DXT3_EXT: number;
-    readonly COMPRESSED_RGBA_S3TC_DXT5_EXT: number;
-    readonly COMPRESSED_RGB_S3TC_DXT1_EXT: number;
-};
-
-interface WEBGL_compressed_texture_s3tc_srgb {
-    readonly COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT: number;
-    readonly COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT: number;
-    readonly COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT: number;
-    readonly COMPRESSED_SRGB_S3TC_DXT1_EXT: number;
-}
-
-interface WEBGL_debug_renderer_info {
-    readonly UNMASKED_RENDERER_WEBGL: number;
-    readonly UNMASKED_VENDOR_WEBGL: number;
-}
-
-declare var WEBGL_debug_renderer_info: {
-    prototype: WEBGL_debug_renderer_info;
-    new(): WEBGL_debug_renderer_info;
-    readonly UNMASKED_RENDERER_WEBGL: number;
-    readonly UNMASKED_VENDOR_WEBGL: number;
-};
-
-interface WEBGL_debug_shaders {
-    getTranslatedShaderSource(shader: WebGLShader): string;
-}
-
-interface WEBGL_depth_texture {
-    readonly UNSIGNED_INT_24_8_WEBGL: number;
-}
-
-declare var WEBGL_depth_texture: {
-    prototype: WEBGL_depth_texture;
-    new(): WEBGL_depth_texture;
-    readonly UNSIGNED_INT_24_8_WEBGL: number;
-};
-
-interface WEBGL_draw_buffers {
-    readonly COLOR_ATTACHMENT0_WEBGL: number;
-    readonly COLOR_ATTACHMENT10_WEBGL: number;
-    readonly COLOR_ATTACHMENT11_WEBGL: number;
-    readonly COLOR_ATTACHMENT12_WEBGL: number;
-    readonly COLOR_ATTACHMENT13_WEBGL: number;
-    readonly COLOR_ATTACHMENT14_WEBGL: number;
-    readonly COLOR_ATTACHMENT15_WEBGL: number;
-    readonly COLOR_ATTACHMENT1_WEBGL: number;
-    readonly COLOR_ATTACHMENT2_WEBGL: number;
-    readonly COLOR_ATTACHMENT3_WEBGL: number;
-    readonly COLOR_ATTACHMENT4_WEBGL: number;
-    readonly COLOR_ATTACHMENT5_WEBGL: number;
-    readonly COLOR_ATTACHMENT6_WEBGL: number;
-    readonly COLOR_ATTACHMENT7_WEBGL: number;
-    readonly COLOR_ATTACHMENT8_WEBGL: number;
-    readonly COLOR_ATTACHMENT9_WEBGL: number;
-    readonly DRAW_BUFFER0_WEBGL: number;
-    readonly DRAW_BUFFER10_WEBGL: number;
-    readonly DRAW_BUFFER11_WEBGL: number;
-    readonly DRAW_BUFFER12_WEBGL: number;
-    readonly DRAW_BUFFER13_WEBGL: number;
-    readonly DRAW_BUFFER14_WEBGL: number;
-    readonly DRAW_BUFFER15_WEBGL: number;
-    readonly DRAW_BUFFER1_WEBGL: number;
-    readonly DRAW_BUFFER2_WEBGL: number;
-    readonly DRAW_BUFFER3_WEBGL: number;
-    readonly DRAW_BUFFER4_WEBGL: number;
-    readonly DRAW_BUFFER5_WEBGL: number;
-    readonly DRAW_BUFFER6_WEBGL: number;
-    readonly DRAW_BUFFER7_WEBGL: number;
-    readonly DRAW_BUFFER8_WEBGL: number;
-    readonly DRAW_BUFFER9_WEBGL: number;
-    readonly MAX_COLOR_ATTACHMENTS_WEBGL: number;
-    readonly MAX_DRAW_BUFFERS_WEBGL: number;
-    drawBuffersWEBGL(buffers: number[]): void;
-}
-
-interface WEBGL_lose_context {
-    loseContext(): void;
-    restoreContext(): void;
-}
-
-interface WaveShaperNode extends AudioNode {
-    curve: Float32Array | null;
-    oversample: OverSampleType;
-}
-
-declare var WaveShaperNode: {
-    prototype: WaveShaperNode;
-    new(): WaveShaperNode;
-};
-
-interface WebAuthentication {
-    getAssertion(assertionChallenge: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null, options?: AssertionOptions): Promise<WebAuthnAssertion>;
-    makeCredential(accountInformation: Account, cryptoParameters: ScopedCredentialParameters[], attestationChallenge: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null, options?: ScopedCredentialOptions): Promise<ScopedCredentialInfo>;
-}
-
-declare var WebAuthentication: {
-    prototype: WebAuthentication;
-    new(): WebAuthentication;
-};
-
-interface WebAuthnAssertion {
-    readonly authenticatorData: ArrayBuffer;
-    readonly clientData: ArrayBuffer;
-    readonly credential: ScopedCredential;
-    readonly signature: ArrayBuffer;
-}
-
-declare var WebAuthnAssertion: {
-    prototype: WebAuthnAssertion;
-    new(): WebAuthnAssertion;
-};
-
-interface WebGLActiveInfo {
-    readonly name: string;
-    readonly size: number;
-    readonly type: number;
-}
-
-declare var WebGLActiveInfo: {
-    prototype: WebGLActiveInfo;
-    new(): WebGLActiveInfo;
-};
-
-interface WebGLBuffer extends WebGLObject {
-}
-
-declare var WebGLBuffer: {
-    prototype: WebGLBuffer;
-    new(): WebGLBuffer;
-};
-
-interface WebGLContextEvent extends Event {
-    readonly statusMessage: string;
-}
-
-declare var WebGLContextEvent: {
-    prototype: WebGLContextEvent;
-    new(typeArg: string, eventInitDict?: WebGLContextEventInit): WebGLContextEvent;
-};
-
-interface WebGLFramebuffer extends WebGLObject {
-}
-
-declare var WebGLFramebuffer: {
-    prototype: WebGLFramebuffer;
-    new(): WebGLFramebuffer;
-};
-
-interface WebGLObject {
-}
-
-declare var WebGLObject: {
-    prototype: WebGLObject;
-    new(): WebGLObject;
-};
-
-interface WebGLProgram extends WebGLObject {
-}
-
-declare var WebGLProgram: {
-    prototype: WebGLProgram;
-    new(): WebGLProgram;
-};
-
-interface WebGLRenderbuffer extends WebGLObject {
-}
-
-declare var WebGLRenderbuffer: {
-    prototype: WebGLRenderbuffer;
-    new(): WebGLRenderbuffer;
-};
-
-interface WebGLRenderingContext {
-    readonly canvas: HTMLCanvasElement;
-    readonly drawingBufferHeight: number;
-    readonly drawingBufferWidth: number;
-    activeTexture(texture: number): void;
-    attachShader(program: WebGLProgram | null, shader: WebGLShader | null): void;
-    bindAttribLocation(program: WebGLProgram | null, index: number, name: string): void;
-    bindBuffer(target: number, buffer: WebGLBuffer | null): void;
-    bindFramebuffer(target: number, framebuffer: WebGLFramebuffer | null): void;
-    bindRenderbuffer(target: number, renderbuffer: WebGLRenderbuffer | null): void;
-    bindTexture(target: number, texture: WebGLTexture | null): void;
-    blendColor(red: number, green: number, blue: number, alpha: number): void;
-    blendEquation(mode: number): void;
-    blendEquationSeparate(modeRGB: number, modeAlpha: number): void;
-    blendFunc(sfactor: number, dfactor: number): void;
-    blendFuncSeparate(srcRGB: number, dstRGB: number, srcAlpha: number, dstAlpha: number): void;
-    bufferData(target: number, size: number | Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null, usage: number): void;
-    bufferSubData(target: number, offset: number, data: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null): void;
-    checkFramebufferStatus(target: number): number;
-    clear(mask: number): void;
-    clearColor(red: number, green: number, blue: number, alpha: number): void;
-    clearDepth(depth: number): void;
-    clearStencil(s: number): void;
-    colorMask(red: boolean, green: boolean, blue: boolean, alpha: boolean): void;
-    compileShader(shader: WebGLShader | null): void;
-    compressedTexImage2D(target: number, level: number, internalformat: number, width: number, height: number, border: number, data: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | null): void;
-    compressedTexSubImage2D(target: number, level: number, xoffset: number, yoffset: number, width: number, height: number, format: number, data: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | null): void;
-    copyTexImage2D(target: number, level: number, internalformat: number, x: number, y: number, width: number, height: number, border: number): void;
-    copyTexSubImage2D(target: number, level: number, xoffset: number, yoffset: number, x: number, y: number, width: number, height: number): void;
-    createBuffer(): WebGLBuffer | null;
-    createFramebuffer(): WebGLFramebuffer | null;
-    createProgram(): WebGLProgram | null;
-    createRenderbuffer(): WebGLRenderbuffer | null;
-    createShader(type: number): WebGLShader | null;
-    createTexture(): WebGLTexture | null;
-    cullFace(mode: number): void;
-    deleteBuffer(buffer: WebGLBuffer | null): void;
-    deleteFramebuffer(framebuffer: WebGLFramebuffer | null): void;
-    deleteProgram(program: WebGLProgram | null): void;
-    deleteRenderbuffer(renderbuffer: WebGLRenderbuffer | null): void;
-    deleteShader(shader: WebGLShader | null): void;
-    deleteTexture(texture: WebGLTexture | null): void;
-    depthFunc(func: number): void;
-    depthMask(flag: boolean): void;
-    depthRange(zNear: number, zFar: number): void;
-    detachShader(program: WebGLProgram | null, shader: WebGLShader | null): void;
-    disable(cap: number): void;
-    disableVertexAttribArray(index: number): void;
-    drawArrays(mode: number, first: number, count: number): void;
-    drawElements(mode: number, count: number, type: number, offset: number): void;
-    enable(cap: number): void;
-    enableVertexAttribArray(index: number): void;
-    finish(): void;
-    flush(): void;
-    framebufferRenderbuffer(target: number, attachment: number, renderbuffertarget: number, renderbuffer: WebGLRenderbuffer | null): void;
-    framebufferTexture2D(target: number, attachment: number, textarget: number, texture: WebGLTexture | null, level: number): void;
-    frontFace(mode: number): void;
-    generateMipmap(target: number): void;
-    getActiveAttrib(program: WebGLProgram | null, index: number): WebGLActiveInfo | null;
-    getActiveUniform(program: WebGLProgram | null, index: number): WebGLActiveInfo | null;
-    getAttachedShaders(program: WebGLProgram | null): WebGLShader[] | null;
-    getAttribLocation(program: WebGLProgram | null, name: string): number;
-    getBufferParameter(target: number, pname: number): any;
-    getContextAttributes(): WebGLContextAttributes;
-    getError(): number;
-    getExtension(extensionName: "EXT_blend_minmax"): EXT_blend_minmax | null;
-    getExtension(extensionName: "EXT_texture_filter_anisotropic"): EXT_texture_filter_anisotropic | null;
-    getExtension(extensionName: "EXT_frag_depth"): EXT_frag_depth | null;
-    getExtension(extensionName: "EXT_shader_texture_lod"): EXT_shader_texture_lod | null;
-    getExtension(extensionName: "EXT_sRGB"): EXT_sRGB | null;
-    getExtension(extensionName: "OES_vertex_array_object"): OES_vertex_array_object | null;
-    getExtension(extensionName: "WEBGL_color_buffer_float"): WEBGL_color_buffer_float | null;
-    getExtension(extensionName: "WEBGL_compressed_texture_astc"): WEBGL_compressed_texture_astc | null;
-    getExtension(extensionName: "WEBGL_compressed_texture_s3tc_srgb"): WEBGL_compressed_texture_s3tc_srgb | null;
-    getExtension(extensionName: "WEBGL_debug_shaders"): WEBGL_debug_shaders | null;
-    getExtension(extensionName: "WEBGL_draw_buffers"): WEBGL_draw_buffers | null;
-    getExtension(extensionName: "WEBGL_lose_context"): WEBGL_lose_context | null;
-    getExtension(extensionName: "WEBGL_depth_texture"): WEBGL_depth_texture | null;
-    getExtension(extensionName: "WEBGL_debug_renderer_info"): WEBGL_debug_renderer_info | null;
-    getExtension(extensionName: "WEBGL_compressed_texture_s3tc"): WEBGL_compressed_texture_s3tc | null;
-    getExtension(extensionName: "OES_texture_half_float_linear"): OES_texture_half_float_linear | null;
-    getExtension(extensionName: "OES_texture_half_float"): OES_texture_half_float | null;
-    getExtension(extensionName: "OES_texture_float_linear"): OES_texture_float_linear | null;
-    getExtension(extensionName: "OES_texture_float"): OES_texture_float | null;
-    getExtension(extensionName: "OES_standard_derivatives"): OES_standard_derivatives | null;
-    getExtension(extensionName: "OES_element_index_uint"): OES_element_index_uint | null;
-    getExtension(extensionName: "ANGLE_instanced_arrays"): ANGLE_instanced_arrays | null;
-    getExtension(extensionName: string): any;
-    getFramebufferAttachmentParameter(target: number, attachment: number, pname: number): any;
-    getParameter(pname: number): any;
-    getProgramInfoLog(program: WebGLProgram | null): string | null;
-    getProgramParameter(program: WebGLProgram | null, pname: number): any;
-    getRenderbufferParameter(target: number, pname: number): any;
-    getShaderInfoLog(shader: WebGLShader | null): string | null;
-    getShaderParameter(shader: WebGLShader | null, pname: number): any;
-    getShaderPrecisionFormat(shadertype: number, precisiontype: number): WebGLShaderPrecisionFormat | null;
-    getShaderSource(shader: WebGLShader | null): string | null;
-    getSupportedExtensions(): string[] | null;
-    getTexParameter(target: number, pname: number): any;
-    getUniform(program: WebGLProgram | null, location: WebGLUniformLocation | null): any;
-    getUniformLocation(program: WebGLProgram | null, name: string): WebGLUniformLocation | null;
-    getVertexAttrib(index: number, pname: number): any;
-    getVertexAttribOffset(index: number, pname: number): number;
-    hint(target: number, mode: number): void;
-    isBuffer(buffer: WebGLBuffer | null): boolean;
-    isContextLost(): boolean;
-    isEnabled(cap: number): boolean;
-    isFramebuffer(framebuffer: WebGLFramebuffer | null): boolean;
-    isProgram(program: WebGLProgram | null): boolean;
-    isRenderbuffer(renderbuffer: WebGLRenderbuffer | null): boolean;
-    isShader(shader: WebGLShader | null): boolean;
-    isTexture(texture: WebGLTexture | null): boolean;
-    lineWidth(width: number): void;
-    linkProgram(program: WebGLProgram | null): void;
-    pixelStorei(pname: number, param: number | boolean): void;
-    polygonOffset(factor: number, units: number): void;
-    readPixels(x: number, y: number, width: number, height: number, format: number, type: number, pixels: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | null): void;
-    renderbufferStorage(target: number, internalformat: number, width: number, height: number): void;
-    sampleCoverage(value: number, invert: boolean): void;
-    scissor(x: number, y: number, width: number, height: number): void;
-    shaderSource(shader: WebGLShader | null, source: string): void;
-    stencilFunc(func: number, ref: number, mask: number): void;
-    stencilFuncSeparate(face: number, func: number, ref: number, mask: number): void;
-    stencilMask(mask: number): void;
-    stencilMaskSeparate(face: number, mask: number): void;
-    stencilOp(fail: number, zfail: number, zpass: number): void;
-    stencilOpSeparate(face: number, fail: number, zfail: number, zpass: number): void;
-    texImage2D(target: number, level: number, internalformat: number, width: number, height: number, border: number, format: number, type: number, pixels: ArrayBufferView | null): void;
-    texImage2D(target: number, level: number, internalformat: number, format: number, type: number, pixels: ImageBitmap | ImageData | HTMLVideoElement | HTMLImageElement | HTMLCanvasElement): void;
-    texParameterf(target: number, pname: number, param: number): void;
-    texParameteri(target: number, pname: number, param: number): void;
-    texSubImage2D(target: number, level: number, xoffset: number, yoffset: number, width: number, height: number, format: number, type: number, pixels: ArrayBufferView | null): void;
-    texSubImage2D(target: number, level: number, xoffset: number, yoffset: number, format: number, type: number, pixels: ImageBitmap | ImageData | HTMLVideoElement | HTMLImageElement | HTMLCanvasElement): void;
-    uniform1f(location: WebGLUniformLocation | null, x: number): void;
-    uniform1fv(location: WebGLUniformLocation | null, v: Float32Array | ArrayLike<number>): void;
-    uniform1i(location: WebGLUniformLocation | null, x: number): void;
-    uniform1iv(location: WebGLUniformLocation | null, v: Int32Array | ArrayLike<number>): void;
-    uniform2f(location: WebGLUniformLocation | null, x: number, y: number): void;
-    uniform2fv(location: WebGLUniformLocation | null, v: Float32Array | ArrayLike<number>): void;
-    uniform2i(location: WebGLUniformLocation | null, x: number, y: number): void;
-    uniform2iv(location: WebGLUniformLocation | null, v: Int32Array | ArrayLike<number>): void;
-    uniform3f(location: WebGLUniformLocation | null, x: number, y: number, z: number): void;
-    uniform3fv(location: WebGLUniformLocation | null, v: Float32Array | ArrayLike<number>): void;
-    uniform3i(location: WebGLUniformLocation | null, x: number, y: number, z: number): void;
-    uniform3iv(location: WebGLUniformLocation | null, v: Int32Array | ArrayLike<number>): void;
-    uniform4f(location: WebGLUniformLocation | null, x: number, y: number, z: number, w: number): void;
-    uniform4fv(location: WebGLUniformLocation | null, v: Float32Array | ArrayLike<number>): void;
-    uniform4i(location: WebGLUniformLocation | null, x: number, y: number, z: number, w: number): void;
-    uniform4iv(location: WebGLUniformLocation | null, v: Int32Array | ArrayLike<number>): void;
-    uniformMatrix2fv(location: WebGLUniformLocation | null, transpose: boolean, value: Float32Array | ArrayLike<number>): void;
-    uniformMatrix3fv(location: WebGLUniformLocation | null, transpose: boolean, value: Float32Array | ArrayLike<number>): void;
-    uniformMatrix4fv(location: WebGLUniformLocation | null, transpose: boolean, value: Float32Array | ArrayLike<number>): void;
-    useProgram(program: WebGLProgram | null): void;
-    validateProgram(program: WebGLProgram | null): void;
-    vertexAttrib1f(indx: number, x: number): void;
-    vertexAttrib1fv(indx: number, values: Float32Array | number[]): void;
-    vertexAttrib2f(indx: number, x: number, y: number): void;
-    vertexAttrib2fv(indx: number, values: Float32Array | number[]): void;
-    vertexAttrib3f(indx: number, x: number, y: number, z: number): void;
-    vertexAttrib3fv(indx: number, values: Float32Array | number[]): void;
-    vertexAttrib4f(indx: number, x: number, y: number, z: number, w: number): void;
-    vertexAttrib4fv(indx: number, values: Float32Array | number[]): void;
-    vertexAttribPointer(indx: number, size: number, type: number, normalized: boolean, stride: number, offset: number): void;
-    viewport(x: number, y: number, width: number, height: number): void;
-    readonly ACTIVE_ATTRIBUTES: number;
-    readonly ACTIVE_TEXTURE: number;
-    readonly ACTIVE_UNIFORMS: number;
-    readonly ALIASED_LINE_WIDTH_RANGE: number;
-    readonly ALIASED_POINT_SIZE_RANGE: number;
-    readonly ALPHA: number;
-    readonly ALPHA_BITS: number;
-    readonly ALWAYS: number;
-    readonly ARRAY_BUFFER: number;
-    readonly ARRAY_BUFFER_BINDING: number;
-    readonly ATTACHED_SHADERS: number;
-    readonly BACK: number;
-    readonly BLEND: number;
-    readonly BLEND_COLOR: number;
-    readonly BLEND_DST_ALPHA: number;
-    readonly BLEND_DST_RGB: number;
-    readonly BLEND_EQUATION: number;
-    readonly BLEND_EQUATION_ALPHA: number;
-    readonly BLEND_EQUATION_RGB: number;
-    readonly BLEND_SRC_ALPHA: number;
-    readonly BLEND_SRC_RGB: number;
-    readonly BLUE_BITS: number;
-    readonly BOOL: number;
-    readonly BOOL_VEC2: number;
-    readonly BOOL_VEC3: number;
-    readonly BOOL_VEC4: number;
-    readonly BROWSER_DEFAULT_WEBGL: number;
-    readonly BUFFER_SIZE: number;
-    readonly BUFFER_USAGE: number;
-    readonly BYTE: number;
-    readonly CCW: number;
-    readonly CLAMP_TO_EDGE: number;
-    readonly COLOR_ATTACHMENT0: number;
-    readonly COLOR_BUFFER_BIT: number;
-    readonly COLOR_CLEAR_VALUE: number;
-    readonly COLOR_WRITEMASK: number;
-    readonly COMPILE_STATUS: number;
-    readonly COMPRESSED_TEXTURE_FORMATS: number;
-    readonly CONSTANT_ALPHA: number;
-    readonly CONSTANT_COLOR: number;
-    readonly CONTEXT_LOST_WEBGL: number;
-    readonly CULL_FACE: number;
-    readonly CULL_FACE_MODE: number;
-    readonly CURRENT_PROGRAM: number;
-    readonly CURRENT_VERTEX_ATTRIB: number;
-    readonly CW: number;
-    readonly DECR: number;
-    readonly DECR_WRAP: number;
-    readonly DELETE_STATUS: number;
-    readonly DEPTH_ATTACHMENT: number;
-    readonly DEPTH_BITS: number;
-    readonly DEPTH_BUFFER_BIT: number;
-    readonly DEPTH_CLEAR_VALUE: number;
-    readonly DEPTH_COMPONENT: number;
-    readonly DEPTH_COMPONENT16: number;
-    readonly DEPTH_FUNC: number;
-    readonly DEPTH_RANGE: number;
-    readonly DEPTH_STENCIL: number;
-    readonly DEPTH_STENCIL_ATTACHMENT: number;
-    readonly DEPTH_TEST: number;
-    readonly DEPTH_WRITEMASK: number;
-    readonly DITHER: number;
-    readonly DONT_CARE: number;
-    readonly DST_ALPHA: number;
-    readonly DST_COLOR: number;
-    readonly DYNAMIC_DRAW: number;
-    readonly ELEMENT_ARRAY_BUFFER: number;
-    readonly ELEMENT_ARRAY_BUFFER_BINDING: number;
-    readonly EQUAL: number;
-    readonly FASTEST: number;
-    readonly FLOAT: number;
-    readonly FLOAT_MAT2: number;
-    readonly FLOAT_MAT3: number;
-    readonly FLOAT_MAT4: number;
-    readonly FLOAT_VEC2: number;
-    readonly FLOAT_VEC3: number;
-    readonly FLOAT_VEC4: number;
-    readonly FRAGMENT_SHADER: number;
-    readonly FRAMEBUFFER: number;
-    readonly FRAMEBUFFER_ATTACHMENT_OBJECT_NAME: number;
-    readonly FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE: number;
-    readonly FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACE: number;
-    readonly FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL: number;
-    readonly FRAMEBUFFER_BINDING: number;
-    readonly FRAMEBUFFER_COMPLETE: number;
-    readonly FRAMEBUFFER_INCOMPLETE_ATTACHMENT: number;
-    readonly FRAMEBUFFER_INCOMPLETE_DIMENSIONS: number;
-    readonly FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT: number;
-    readonly FRAMEBUFFER_UNSUPPORTED: number;
-    readonly FRONT: number;
-    readonly FRONT_AND_BACK: number;
-    readonly FRONT_FACE: number;
-    readonly FUNC_ADD: number;
-    readonly FUNC_REVERSE_SUBTRACT: number;
-    readonly FUNC_SUBTRACT: number;
-    readonly GENERATE_MIPMAP_HINT: number;
-    readonly GEQUAL: number;
-    readonly GREATER: number;
-    readonly GREEN_BITS: number;
-    readonly HIGH_FLOAT: number;
-    readonly HIGH_INT: number;
-    readonly IMPLEMENTATION_COLOR_READ_FORMAT: number;
-    readonly IMPLEMENTATION_COLOR_READ_TYPE: number;
-    readonly INCR: number;
-    readonly INCR_WRAP: number;
-    readonly INT: number;
-    readonly INT_VEC2: number;
-    readonly INT_VEC3: number;
-    readonly INT_VEC4: number;
-    readonly INVALID_ENUM: number;
-    readonly INVALID_FRAMEBUFFER_OPERATION: number;
-    readonly INVALID_OPERATION: number;
-    readonly INVALID_VALUE: number;
-    readonly INVERT: number;
-    readonly KEEP: number;
-    readonly LEQUAL: number;
-    readonly LESS: number;
-    readonly LINEAR: number;
-    readonly LINEAR_MIPMAP_LINEAR: number;
-    readonly LINEAR_MIPMAP_NEAREST: number;
-    readonly LINES: number;
-    readonly LINE_LOOP: number;
-    readonly LINE_STRIP: number;
-    readonly LINE_WIDTH: number;
-    readonly LINK_STATUS: number;
-    readonly LOW_FLOAT: number;
-    readonly LOW_INT: number;
-    readonly LUMINANCE: number;
-    readonly LUMINANCE_ALPHA: number;
-    readonly MAX_COMBINED_TEXTURE_IMAGE_UNITS: number;
-    readonly MAX_CUBE_MAP_TEXTURE_SIZE: number;
-    readonly MAX_FRAGMENT_UNIFORM_VECTORS: number;
-    readonly MAX_RENDERBUFFER_SIZE: number;
-    readonly MAX_TEXTURE_IMAGE_UNITS: number;
-    readonly MAX_TEXTURE_SIZE: number;
-    readonly MAX_VARYING_VECTORS: number;
-    readonly MAX_VERTEX_ATTRIBS: number;
-    readonly MAX_VERTEX_TEXTURE_IMAGE_UNITS: number;
-    readonly MAX_VERTEX_UNIFORM_VECTORS: number;
-    readonly MAX_VIEWPORT_DIMS: number;
-    readonly MEDIUM_FLOAT: number;
-    readonly MEDIUM_INT: number;
-    readonly MIRRORED_REPEAT: number;
-    readonly NEAREST: number;
-    readonly NEAREST_MIPMAP_LINEAR: number;
-    readonly NEAREST_MIPMAP_NEAREST: number;
-    readonly NEVER: number;
-    readonly NICEST: number;
-    readonly NONE: number;
-    readonly NOTEQUAL: number;
-    readonly NO_ERROR: number;
-    readonly ONE: number;
-    readonly ONE_MINUS_CONSTANT_ALPHA: number;
-    readonly ONE_MINUS_CONSTANT_COLOR: number;
-    readonly ONE_MINUS_DST_ALPHA: number;
-    readonly ONE_MINUS_DST_COLOR: number;
-    readonly ONE_MINUS_SRC_ALPHA: number;
-    readonly ONE_MINUS_SRC_COLOR: number;
-    readonly OUT_OF_MEMORY: number;
-    readonly PACK_ALIGNMENT: number;
-    readonly POINTS: number;
-    readonly POLYGON_OFFSET_FACTOR: number;
-    readonly POLYGON_OFFSET_FILL: number;
-    readonly POLYGON_OFFSET_UNITS: number;
-    readonly RED_BITS: number;
-    readonly RENDERBUFFER: number;
-    readonly RENDERBUFFER_ALPHA_SIZE: number;
-    readonly RENDERBUFFER_BINDING: number;
-    readonly RENDERBUFFER_BLUE_SIZE: number;
-    readonly RENDERBUFFER_DEPTH_SIZE: number;
-    readonly RENDERBUFFER_GREEN_SIZE: number;
-    readonly RENDERBUFFER_HEIGHT: number;
-    readonly RENDERBUFFER_INTERNAL_FORMAT: number;
-    readonly RENDERBUFFER_RED_SIZE: number;
-    readonly RENDERBUFFER_STENCIL_SIZE: number;
-    readonly RENDERBUFFER_WIDTH: number;
-    readonly RENDERER: number;
-    readonly REPEAT: number;
-    readonly REPLACE: number;
-    readonly RGB: number;
-    readonly RGB565: number;
-    readonly RGB5_A1: number;
-    readonly RGBA: number;
-    readonly RGBA4: number;
-    readonly SAMPLER_2D: number;
-    readonly SAMPLER_CUBE: number;
-    readonly SAMPLES: number;
-    readonly SAMPLE_ALPHA_TO_COVERAGE: number;
-    readonly SAMPLE_BUFFERS: number;
-    readonly SAMPLE_COVERAGE: number;
-    readonly SAMPLE_COVERAGE_INVERT: number;
-    readonly SAMPLE_COVERAGE_VALUE: number;
-    readonly SCISSOR_BOX: number;
-    readonly SCISSOR_TEST: number;
-    readonly SHADER_TYPE: number;
-    readonly SHADING_LANGUAGE_VERSION: number;
-    readonly SHORT: number;
-    readonly SRC_ALPHA: number;
-    readonly SRC_ALPHA_SATURATE: number;
-    readonly SRC_COLOR: number;
-    readonly STATIC_DRAW: number;
-    readonly STENCIL_ATTACHMENT: number;
-    readonly STENCIL_BACK_FAIL: number;
-    readonly STENCIL_BACK_FUNC: number;
-    readonly STENCIL_BACK_PASS_DEPTH_FAIL: number;
-    readonly STENCIL_BACK_PASS_DEPTH_PASS: number;
-    readonly STENCIL_BACK_REF: number;
-    readonly STENCIL_BACK_VALUE_MASK: number;
-    readonly STENCIL_BACK_WRITEMASK: number;
-    readonly STENCIL_BITS: number;
-    readonly STENCIL_BUFFER_BIT: number;
-    readonly STENCIL_CLEAR_VALUE: number;
-    readonly STENCIL_FAIL: number;
-    readonly STENCIL_FUNC: number;
-    readonly STENCIL_INDEX: number;
-    readonly STENCIL_INDEX8: number;
-    readonly STENCIL_PASS_DEPTH_FAIL: number;
-    readonly STENCIL_PASS_DEPTH_PASS: number;
-    readonly STENCIL_REF: number;
-    readonly STENCIL_TEST: number;
-    readonly STENCIL_VALUE_MASK: number;
-    readonly STENCIL_WRITEMASK: number;
-    readonly STREAM_DRAW: number;
-    readonly SUBPIXEL_BITS: number;
-    readonly TEXTURE: number;
-    readonly TEXTURE0: number;
-    readonly TEXTURE1: number;
-    readonly TEXTURE10: number;
-    readonly TEXTURE11: number;
-    readonly TEXTURE12: number;
-    readonly TEXTURE13: number;
-    readonly TEXTURE14: number;
-    readonly TEXTURE15: number;
-    readonly TEXTURE16: number;
-    readonly TEXTURE17: number;
-    readonly TEXTURE18: number;
-    readonly TEXTURE19: number;
-    readonly TEXTURE2: number;
-    readonly TEXTURE20: number;
-    readonly TEXTURE21: number;
-    readonly TEXTURE22: number;
-    readonly TEXTURE23: number;
-    readonly TEXTURE24: number;
-    readonly TEXTURE25: number;
-    readonly TEXTURE26: number;
-    readonly TEXTURE27: number;
-    readonly TEXTURE28: number;
-    readonly TEXTURE29: number;
-    readonly TEXTURE3: number;
-    readonly TEXTURE30: number;
-    readonly TEXTURE31: number;
-    readonly TEXTURE4: number;
-    readonly TEXTURE5: number;
-    readonly TEXTURE6: number;
-    readonly TEXTURE7: number;
-    readonly TEXTURE8: number;
-    readonly TEXTURE9: number;
-    readonly TEXTURE_2D: number;
-    readonly TEXTURE_BINDING_2D: number;
-    readonly TEXTURE_BINDING_CUBE_MAP: number;
-    readonly TEXTURE_CUBE_MAP: number;
-    readonly TEXTURE_CUBE_MAP_NEGATIVE_X: number;
-    readonly TEXTURE_CUBE_MAP_NEGATIVE_Y: number;
-    readonly TEXTURE_CUBE_MAP_NEGATIVE_Z: number;
-    readonly TEXTURE_CUBE_MAP_POSITIVE_X: number;
-    readonly TEXTURE_CUBE_MAP_POSITIVE_Y: number;
-    readonly TEXTURE_CUBE_MAP_POSITIVE_Z: number;
-    readonly TEXTURE_MAG_FILTER: number;
-    readonly TEXTURE_MIN_FILTER: number;
-    readonly TEXTURE_WRAP_S: number;
-    readonly TEXTURE_WRAP_T: number;
-    readonly TRIANGLES: number;
-    readonly TRIANGLE_FAN: number;
-    readonly TRIANGLE_STRIP: number;
-    readonly UNPACK_ALIGNMENT: number;
-    readonly UNPACK_COLORSPACE_CONVERSION_WEBGL: number;
-    readonly UNPACK_FLIP_Y_WEBGL: number;
-    readonly UNPACK_PREMULTIPLY_ALPHA_WEBGL: number;
-    readonly UNSIGNED_BYTE: number;
-    readonly UNSIGNED_INT: number;
-    readonly UNSIGNED_SHORT: number;
-    readonly UNSIGNED_SHORT_4_4_4_4: number;
-    readonly UNSIGNED_SHORT_5_5_5_1: number;
-    readonly UNSIGNED_SHORT_5_6_5: number;
-    readonly VALIDATE_STATUS: number;
-    readonly VENDOR: number;
-    readonly VERSION: number;
-    readonly VERTEX_ATTRIB_ARRAY_BUFFER_BINDING: number;
-    readonly VERTEX_ATTRIB_ARRAY_ENABLED: number;
-    readonly VERTEX_ATTRIB_ARRAY_NORMALIZED: number;
-    readonly VERTEX_ATTRIB_ARRAY_POINTER: number;
-    readonly VERTEX_ATTRIB_ARRAY_SIZE: number;
-    readonly VERTEX_ATTRIB_ARRAY_STRIDE: number;
-    readonly VERTEX_ATTRIB_ARRAY_TYPE: number;
-    readonly VERTEX_SHADER: number;
-    readonly VIEWPORT: number;
-    readonly ZERO: number;
-}
-
-declare var WebGLRenderingContext: {
-    prototype: WebGLRenderingContext;
-    new(): WebGLRenderingContext;
-    readonly ACTIVE_ATTRIBUTES: number;
-    readonly ACTIVE_TEXTURE: number;
-    readonly ACTIVE_UNIFORMS: number;
-    readonly ALIASED_LINE_WIDTH_RANGE: number;
-    readonly ALIASED_POINT_SIZE_RANGE: number;
-    readonly ALPHA: number;
-    readonly ALPHA_BITS: number;
-    readonly ALWAYS: number;
-    readonly ARRAY_BUFFER: number;
-    readonly ARRAY_BUFFER_BINDING: number;
-    readonly ATTACHED_SHADERS: number;
-    readonly BACK: number;
-    readonly BLEND: number;
-    readonly BLEND_COLOR: number;
-    readonly BLEND_DST_ALPHA: number;
-    readonly BLEND_DST_RGB: number;
-    readonly BLEND_EQUATION: number;
-    readonly BLEND_EQUATION_ALPHA: number;
-    readonly BLEND_EQUATION_RGB: number;
-    readonly BLEND_SRC_ALPHA: number;
-    readonly BLEND_SRC_RGB: number;
-    readonly BLUE_BITS: number;
-    readonly BOOL: number;
-    readonly BOOL_VEC2: number;
-    readonly BOOL_VEC3: number;
-    readonly BOOL_VEC4: number;
-    readonly BROWSER_DEFAULT_WEBGL: number;
-    readonly BUFFER_SIZE: number;
-    readonly BUFFER_USAGE: number;
-    readonly BYTE: number;
-    readonly CCW: number;
-    readonly CLAMP_TO_EDGE: number;
-    readonly COLOR_ATTACHMENT0: number;
-    readonly COLOR_BUFFER_BIT: number;
-    readonly COLOR_CLEAR_VALUE: number;
-    readonly COLOR_WRITEMASK: number;
-    readonly COMPILE_STATUS: number;
-    readonly COMPRESSED_TEXTURE_FORMATS: number;
-    readonly CONSTANT_ALPHA: number;
-    readonly CONSTANT_COLOR: number;
-    readonly CONTEXT_LOST_WEBGL: number;
-    readonly CULL_FACE: number;
-    readonly CULL_FACE_MODE: number;
-    readonly CURRENT_PROGRAM: number;
-    readonly CURRENT_VERTEX_ATTRIB: number;
-    readonly CW: number;
-    readonly DECR: number;
-    readonly DECR_WRAP: number;
-    readonly DELETE_STATUS: number;
-    readonly DEPTH_ATTACHMENT: number;
-    readonly DEPTH_BITS: number;
-    readonly DEPTH_BUFFER_BIT: number;
-    readonly DEPTH_CLEAR_VALUE: number;
-    readonly DEPTH_COMPONENT: number;
-    readonly DEPTH_COMPONENT16: number;
-    readonly DEPTH_FUNC: number;
-    readonly DEPTH_RANGE: number;
-    readonly DEPTH_STENCIL: number;
-    readonly DEPTH_STENCIL_ATTACHMENT: number;
-    readonly DEPTH_TEST: number;
-    readonly DEPTH_WRITEMASK: number;
-    readonly DITHER: number;
-    readonly DONT_CARE: number;
-    readonly DST_ALPHA: number;
-    readonly DST_COLOR: number;
-    readonly DYNAMIC_DRAW: number;
-    readonly ELEMENT_ARRAY_BUFFER: number;
-    readonly ELEMENT_ARRAY_BUFFER_BINDING: number;
-    readonly EQUAL: number;
-    readonly FASTEST: number;
-    readonly FLOAT: number;
-    readonly FLOAT_MAT2: number;
-    readonly FLOAT_MAT3: number;
-    readonly FLOAT_MAT4: number;
-    readonly FLOAT_VEC2: number;
-    readonly FLOAT_VEC3: number;
-    readonly FLOAT_VEC4: number;
-    readonly FRAGMENT_SHADER: number;
-    readonly FRAMEBUFFER: number;
-    readonly FRAMEBUFFER_ATTACHMENT_OBJECT_NAME: number;
-    readonly FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE: number;
-    readonly FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACE: number;
-    readonly FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL: number;
-    readonly FRAMEBUFFER_BINDING: number;
-    readonly FRAMEBUFFER_COMPLETE: number;
-    readonly FRAMEBUFFER_INCOMPLETE_ATTACHMENT: number;
-    readonly FRAMEBUFFER_INCOMPLETE_DIMENSIONS: number;
-    readonly FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT: number;
-    readonly FRAMEBUFFER_UNSUPPORTED: number;
-    readonly FRONT: number;
-    readonly FRONT_AND_BACK: number;
-    readonly FRONT_FACE: number;
-    readonly FUNC_ADD: number;
-    readonly FUNC_REVERSE_SUBTRACT: number;
-    readonly FUNC_SUBTRACT: number;
-    readonly GENERATE_MIPMAP_HINT: number;
-    readonly GEQUAL: number;
-    readonly GREATER: number;
-    readonly GREEN_BITS: number;
-    readonly HIGH_FLOAT: number;
-    readonly HIGH_INT: number;
-    readonly IMPLEMENTATION_COLOR_READ_FORMAT: number;
-    readonly IMPLEMENTATION_COLOR_READ_TYPE: number;
-    readonly INCR: number;
-    readonly INCR_WRAP: number;
-    readonly INT: number;
-    readonly INT_VEC2: number;
-    readonly INT_VEC3: number;
-    readonly INT_VEC4: number;
-    readonly INVALID_ENUM: number;
-    readonly INVALID_FRAMEBUFFER_OPERATION: number;
-    readonly INVALID_OPERATION: number;
-    readonly INVALID_VALUE: number;
-    readonly INVERT: number;
-    readonly KEEP: number;
-    readonly LEQUAL: number;
-    readonly LESS: number;
-    readonly LINEAR: number;
-    readonly LINEAR_MIPMAP_LINEAR: number;
-    readonly LINEAR_MIPMAP_NEAREST: number;
-    readonly LINES: number;
-    readonly LINE_LOOP: number;
-    readonly LINE_STRIP: number;
-    readonly LINE_WIDTH: number;
-    readonly LINK_STATUS: number;
-    readonly LOW_FLOAT: number;
-    readonly LOW_INT: number;
-    readonly LUMINANCE: number;
-    readonly LUMINANCE_ALPHA: number;
-    readonly MAX_COMBINED_TEXTURE_IMAGE_UNITS: number;
-    readonly MAX_CUBE_MAP_TEXTURE_SIZE: number;
-    readonly MAX_FRAGMENT_UNIFORM_VECTORS: number;
-    readonly MAX_RENDERBUFFER_SIZE: number;
-    readonly MAX_TEXTURE_IMAGE_UNITS: number;
-    readonly MAX_TEXTURE_SIZE: number;
-    readonly MAX_VARYING_VECTORS: number;
-    readonly MAX_VERTEX_ATTRIBS: number;
-    readonly MAX_VERTEX_TEXTURE_IMAGE_UNITS: number;
-    readonly MAX_VERTEX_UNIFORM_VECTORS: number;
-    readonly MAX_VIEWPORT_DIMS: number;
-    readonly MEDIUM_FLOAT: number;
-    readonly MEDIUM_INT: number;
-    readonly MIRRORED_REPEAT: number;
-    readonly NEAREST: number;
-    readonly NEAREST_MIPMAP_LINEAR: number;
-    readonly NEAREST_MIPMAP_NEAREST: number;
-    readonly NEVER: number;
-    readonly NICEST: number;
-    readonly NONE: number;
-    readonly NOTEQUAL: number;
-    readonly NO_ERROR: number;
-    readonly ONE: number;
-    readonly ONE_MINUS_CONSTANT_ALPHA: number;
-    readonly ONE_MINUS_CONSTANT_COLOR: number;
-    readonly ONE_MINUS_DST_ALPHA: number;
-    readonly ONE_MINUS_DST_COLOR: number;
-    readonly ONE_MINUS_SRC_ALPHA: number;
-    readonly ONE_MINUS_SRC_COLOR: number;
-    readonly OUT_OF_MEMORY: number;
-    readonly PACK_ALIGNMENT: number;
-    readonly POINTS: number;
-    readonly POLYGON_OFFSET_FACTOR: number;
-    readonly POLYGON_OFFSET_FILL: number;
-    readonly POLYGON_OFFSET_UNITS: number;
-    readonly RED_BITS: number;
-    readonly RENDERBUFFER: number;
-    readonly RENDERBUFFER_ALPHA_SIZE: number;
-    readonly RENDERBUFFER_BINDING: number;
-    readonly RENDERBUFFER_BLUE_SIZE: number;
-    readonly RENDERBUFFER_DEPTH_SIZE: number;
-    readonly RENDERBUFFER_GREEN_SIZE: number;
-    readonly RENDERBUFFER_HEIGHT: number;
-    readonly RENDERBUFFER_INTERNAL_FORMAT: number;
-    readonly RENDERBUFFER_RED_SIZE: number;
-    readonly RENDERBUFFER_STENCIL_SIZE: number;
-    readonly RENDERBUFFER_WIDTH: number;
-    readonly RENDERER: number;
-    readonly REPEAT: number;
-    readonly REPLACE: number;
-    readonly RGB: number;
-    readonly RGB565: number;
-    readonly RGB5_A1: number;
-    readonly RGBA: number;
-    readonly RGBA4: number;
-    readonly SAMPLER_2D: number;
-    readonly SAMPLER_CUBE: number;
-    readonly SAMPLES: number;
-    readonly SAMPLE_ALPHA_TO_COVERAGE: number;
-    readonly SAMPLE_BUFFERS: number;
-    readonly SAMPLE_COVERAGE: number;
-    readonly SAMPLE_COVERAGE_INVERT: number;
-    readonly SAMPLE_COVERAGE_VALUE: number;
-    readonly SCISSOR_BOX: number;
-    readonly SCISSOR_TEST: number;
-    readonly SHADER_TYPE: number;
-    readonly SHADING_LANGUAGE_VERSION: number;
-    readonly SHORT: number;
-    readonly SRC_ALPHA: number;
-    readonly SRC_ALPHA_SATURATE: number;
-    readonly SRC_COLOR: number;
-    readonly STATIC_DRAW: number;
-    readonly STENCIL_ATTACHMENT: number;
-    readonly STENCIL_BACK_FAIL: number;
-    readonly STENCIL_BACK_FUNC: number;
-    readonly STENCIL_BACK_PASS_DEPTH_FAIL: number;
-    readonly STENCIL_BACK_PASS_DEPTH_PASS: number;
-    readonly STENCIL_BACK_REF: number;
-    readonly STENCIL_BACK_VALUE_MASK: number;
-    readonly STENCIL_BACK_WRITEMASK: number;
-    readonly STENCIL_BITS: number;
-    readonly STENCIL_BUFFER_BIT: number;
-    readonly STENCIL_CLEAR_VALUE: number;
-    readonly STENCIL_FAIL: number;
-    readonly STENCIL_FUNC: number;
-    readonly STENCIL_INDEX: number;
-    readonly STENCIL_INDEX8: number;
-    readonly STENCIL_PASS_DEPTH_FAIL: number;
-    readonly STENCIL_PASS_DEPTH_PASS: number;
-    readonly STENCIL_REF: number;
-    readonly STENCIL_TEST: number;
-    readonly STENCIL_VALUE_MASK: number;
-    readonly STENCIL_WRITEMASK: number;
-    readonly STREAM_DRAW: number;
-    readonly SUBPIXEL_BITS: number;
-    readonly TEXTURE: number;
-    readonly TEXTURE0: number;
-    readonly TEXTURE1: number;
-    readonly TEXTURE10: number;
-    readonly TEXTURE11: number;
-    readonly TEXTURE12: number;
-    readonly TEXTURE13: number;
-    readonly TEXTURE14: number;
-    readonly TEXTURE15: number;
-    readonly TEXTURE16: number;
-    readonly TEXTURE17: number;
-    readonly TEXTURE18: number;
-    readonly TEXTURE19: number;
-    readonly TEXTURE2: number;
-    readonly TEXTURE20: number;
-    readonly TEXTURE21: number;
-    readonly TEXTURE22: number;
-    readonly TEXTURE23: number;
-    readonly TEXTURE24: number;
-    readonly TEXTURE25: number;
-    readonly TEXTURE26: number;
-    readonly TEXTURE27: number;
-    readonly TEXTURE28: number;
-    readonly TEXTURE29: number;
-    readonly TEXTURE3: number;
-    readonly TEXTURE30: number;
-    readonly TEXTURE31: number;
-    readonly TEXTURE4: number;
-    readonly TEXTURE5: number;
-    readonly TEXTURE6: number;
-    readonly TEXTURE7: number;
-    readonly TEXTURE8: number;
-    readonly TEXTURE9: number;
-    readonly TEXTURE_2D: number;
-    readonly TEXTURE_BINDING_2D: number;
-    readonly TEXTURE_BINDING_CUBE_MAP: number;
-    readonly TEXTURE_CUBE_MAP: number;
-    readonly TEXTURE_CUBE_MAP_NEGATIVE_X: number;
-    readonly TEXTURE_CUBE_MAP_NEGATIVE_Y: number;
-    readonly TEXTURE_CUBE_MAP_NEGATIVE_Z: number;
-    readonly TEXTURE_CUBE_MAP_POSITIVE_X: number;
-    readonly TEXTURE_CUBE_MAP_POSITIVE_Y: number;
-    readonly TEXTURE_CUBE_MAP_POSITIVE_Z: number;
-    readonly TEXTURE_MAG_FILTER: number;
-    readonly TEXTURE_MIN_FILTER: number;
-    readonly TEXTURE_WRAP_S: number;
-    readonly TEXTURE_WRAP_T: number;
-    readonly TRIANGLES: number;
-    readonly TRIANGLE_FAN: number;
-    readonly TRIANGLE_STRIP: number;
-    readonly UNPACK_ALIGNMENT: number;
-    readonly UNPACK_COLORSPACE_CONVERSION_WEBGL: number;
-    readonly UNPACK_FLIP_Y_WEBGL: number;
-    readonly UNPACK_PREMULTIPLY_ALPHA_WEBGL: number;
-    readonly UNSIGNED_BYTE: number;
-    readonly UNSIGNED_INT: number;
-    readonly UNSIGNED_SHORT: number;
-    readonly UNSIGNED_SHORT_4_4_4_4: number;
-    readonly UNSIGNED_SHORT_5_5_5_1: number;
-    readonly UNSIGNED_SHORT_5_6_5: number;
-    readonly VALIDATE_STATUS: number;
-    readonly VENDOR: number;
-    readonly VERSION: number;
-    readonly VERTEX_ATTRIB_ARRAY_BUFFER_BINDING: number;
-    readonly VERTEX_ATTRIB_ARRAY_ENABLED: number;
-    readonly VERTEX_ATTRIB_ARRAY_NORMALIZED: number;
-    readonly VERTEX_ATTRIB_ARRAY_POINTER: number;
-    readonly VERTEX_ATTRIB_ARRAY_SIZE: number;
-    readonly VERTEX_ATTRIB_ARRAY_STRIDE: number;
-    readonly VERTEX_ATTRIB_ARRAY_TYPE: number;
-    readonly VERTEX_SHADER: number;
-    readonly VIEWPORT: number;
-    readonly ZERO: number;
-};
-
-interface WebGLShader extends WebGLObject {
-}
-
-declare var WebGLShader: {
-    prototype: WebGLShader;
-    new(): WebGLShader;
-};
-
-interface WebGLShaderPrecisionFormat {
-    readonly precision: number;
-    readonly rangeMax: number;
-    readonly rangeMin: number;
-}
-
-declare var WebGLShaderPrecisionFormat: {
-    prototype: WebGLShaderPrecisionFormat;
-    new(): WebGLShaderPrecisionFormat;
-};
-
-interface WebGLTexture extends WebGLObject {
-}
-
-declare var WebGLTexture: {
-    prototype: WebGLTexture;
-    new(): WebGLTexture;
-};
-
-interface WebGLUniformLocation {
-}
-
-declare var WebGLUniformLocation: {
-    prototype: WebGLUniformLocation;
-    new(): WebGLUniformLocation;
-};
-
-interface WebGLVertexArrayObjectOES {
-}
-
-interface WebKitCSSMatrix {
-    a: number;
-    b: number;
-    c: number;
-    d: number;
-    e: number;
-    f: number;
-    m11: number;
-    m12: number;
-    m13: number;
-    m14: number;
-    m21: number;
-    m22: number;
-    m23: number;
-    m24: number;
-    m31: number;
-    m32: number;
-    m33: number;
-    m34: number;
-    m41: number;
-    m42: number;
-    m43: number;
-    m44: number;
-    inverse(): WebKitCSSMatrix;
-    multiply(secondMatrix: WebKitCSSMatrix): WebKitCSSMatrix;
-    rotate(angleX: number, angleY?: number, angleZ?: number): WebKitCSSMatrix;
-    rotateAxisAngle(x: number, y: number, z: number, angle: number): WebKitCSSMatrix;
-    scale(scaleX: number, scaleY?: number, scaleZ?: number): WebKitCSSMatrix;
-    setMatrixValue(value: string): void;
-    skewX(angle: number): WebKitCSSMatrix;
-    skewY(angle: number): WebKitCSSMatrix;
-    toString(): string;
-    translate(x: number, y: number, z?: number): WebKitCSSMatrix;
-}
-
-declare var WebKitCSSMatrix: {
-    prototype: WebKitCSSMatrix;
-    new(text?: string): WebKitCSSMatrix;
-};
-
-interface WebKitDirectoryEntry extends WebKitEntry {
-    createReader(): WebKitDirectoryReader;
-}
-
-declare var WebKitDirectoryEntry: {
-    prototype: WebKitDirectoryEntry;
-    new(): WebKitDirectoryEntry;
-};
-
-interface WebKitDirectoryReader {
-    readEntries(successCallback: WebKitEntriesCallback, errorCallback?: WebKitErrorCallback): void;
-}
-
-declare var WebKitDirectoryReader: {
-    prototype: WebKitDirectoryReader;
-    new(): WebKitDirectoryReader;
-};
-
-interface WebKitEntry {
-    readonly filesystem: WebKitFileSystem;
-    readonly fullPath: string;
-    readonly isDirectory: boolean;
-    readonly isFile: boolean;
-    readonly name: string;
-}
-
-declare var WebKitEntry: {
-    prototype: WebKitEntry;
-    new(): WebKitEntry;
-};
-
-interface WebKitFileEntry extends WebKitEntry {
-    file(successCallback: WebKitFileCallback, errorCallback?: WebKitErrorCallback): void;
-}
-
-declare var WebKitFileEntry: {
-    prototype: WebKitFileEntry;
-    new(): WebKitFileEntry;
-};
-
-interface WebKitFileSystem {
-    readonly name: string;
-    readonly root: WebKitDirectoryEntry;
-}
-
-declare var WebKitFileSystem: {
-    prototype: WebKitFileSystem;
-    new(): WebKitFileSystem;
-};
-
-interface WebKitPoint {
-    x: number;
-    y: number;
-}
-
-declare var WebKitPoint: {
-    prototype: WebKitPoint;
-    new(x?: number, y?: number): WebKitPoint;
-};
-
-interface WebSocketEventMap {
-    "close": CloseEvent;
-    "error": Event;
-    "message": MessageEvent;
-    "open": Event;
-}
-
-interface WebSocket extends EventTarget {
-    binaryType: BinaryType;
-    readonly bufferedAmount: number;
-    readonly extensions: string;
-    onclose: ((this: WebSocket, ev: CloseEvent) => any) | null;
-    onerror: ((this: WebSocket, ev: Event) => any) | null;
-    onmessage: ((this: WebSocket, ev: MessageEvent) => any) | null;
-    onopen: ((this: WebSocket, ev: Event) => any) | null;
-    readonly protocol: string;
-    readonly readyState: number;
-    readonly url: string;
-    close(code?: number, reason?: string): void;
-    send(data: string | ArrayBufferLike | Blob | ArrayBufferView): void;
-    readonly CLOSED: number;
-    readonly CLOSING: number;
-    readonly CONNECTING: number;
-    readonly OPEN: number;
-    addEventListener<K extends keyof WebSocketEventMap>(type: K, listener: (this: WebSocket, ev: WebSocketEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof WebSocketEventMap>(type: K, listener: (this: WebSocket, ev: WebSocketEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var WebSocket: {
-    prototype: WebSocket;
-    new(url: string, protocols?: string | string[]): WebSocket;
-    readonly CLOSED: number;
-    readonly CLOSING: number;
-    readonly CONNECTING: number;
-    readonly OPEN: number;
-};
-
-interface WheelEvent extends MouseEvent {
-    readonly deltaMode: number;
-    readonly deltaX: number;
-    readonly deltaY: number;
-    readonly deltaZ: number;
-    readonly wheelDelta: number;
-    readonly wheelDeltaX: number;
-    readonly wheelDeltaY: number;
-    getCurrentPoint(element: Element): void;
-    initWheelEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number, screenXArg: number, screenYArg: number, clientXArg: number, clientYArg: number, buttonArg: number, relatedTargetArg: EventTarget, modifiersListArg: string, deltaXArg: number, deltaYArg: number, deltaZArg: number, deltaMode: number): void;
-    readonly DOM_DELTA_LINE: number;
-    readonly DOM_DELTA_PAGE: number;
-    readonly DOM_DELTA_PIXEL: number;
-}
-
-declare var WheelEvent: {
-    prototype: WheelEvent;
-    new(typeArg: string, eventInitDict?: WheelEventInit): WheelEvent;
-    readonly DOM_DELTA_LINE: number;
-    readonly DOM_DELTA_PAGE: number;
-    readonly DOM_DELTA_PIXEL: number;
-};
-
-interface WindowEventMap extends GlobalEventHandlersEventMap {
-    "abort": UIEvent;
-    "afterprint": Event;
-    "beforeprint": Event;
-    "beforeunload": BeforeUnloadEvent;
-    "blur": FocusEvent;
-    "canplay": Event;
-    "canplaythrough": Event;
-    "change": Event;
-    "click": MouseEvent;
-    "compassneedscalibration": Event;
-    "contextmenu": PointerEvent;
-    "dblclick": MouseEvent;
-    "devicelight": DeviceLightEvent;
-    "devicemotion": DeviceMotionEvent;
-    "deviceorientation": DeviceOrientationEvent;
-    "drag": DragEvent;
-    "dragend": DragEvent;
-    "dragenter": DragEvent;
-    "dragleave": DragEvent;
-    "dragover": DragEvent;
-    "dragstart": DragEvent;
-    "drop": DragEvent;
-    "durationchange": Event;
-    "emptied": Event;
-    "ended": Event;
-    "error": ErrorEvent;
-    "focus": FocusEvent;
-    "hashchange": HashChangeEvent;
-    "input": Event;
-    "invalid": Event;
-    "keydown": KeyboardEvent;
-    "keypress": KeyboardEvent;
-    "keyup": KeyboardEvent;
-    "load": Event;
-    "loadeddata": Event;
-    "loadedmetadata": Event;
-    "loadstart": Event;
-    "message": MessageEvent;
-    "mousedown": MouseEvent;
-    "mouseenter": MouseEvent;
-    "mouseleave": MouseEvent;
-    "mousemove": MouseEvent;
-    "mouseout": MouseEvent;
-    "mouseover": MouseEvent;
-    "mouseup": MouseEvent;
-    "mousewheel": WheelEvent;
-    "MSGestureChange": Event;
-    "MSGestureDoubleTap": Event;
-    "MSGestureEnd": Event;
-    "MSGestureHold": Event;
-    "MSGestureStart": Event;
-    "MSGestureTap": Event;
-    "MSInertiaStart": Event;
-    "MSPointerCancel": Event;
-    "MSPointerDown": Event;
-    "MSPointerEnter": Event;
-    "MSPointerLeave": Event;
-    "MSPointerMove": Event;
-    "MSPointerOut": Event;
-    "MSPointerOver": Event;
-    "MSPointerUp": Event;
-    "offline": Event;
-    "online": Event;
-    "orientationchange": Event;
-    "pagehide": PageTransitionEvent;
-    "pageshow": PageTransitionEvent;
-    "pause": Event;
-    "play": Event;
-    "playing": Event;
-    "popstate": PopStateEvent;
-    "progress": ProgressEvent;
-    "ratechange": Event;
-    "readystatechange": ProgressEvent;
-    "reset": Event;
-    "resize": UIEvent;
-    "scroll": UIEvent;
-    "seeked": Event;
-    "seeking": Event;
-    "select": UIEvent;
-    "stalled": Event;
-    "storage": StorageEvent;
-    "submit": Event;
-    "suspend": Event;
-    "timeupdate": Event;
-    "touchcancel": TouchEvent;
-    "touchend": TouchEvent;
-    "touchmove": TouchEvent;
-    "touchstart": TouchEvent;
-    "unload": Event;
-    "volumechange": Event;
-    "vrdisplayactivate": Event;
-    "vrdisplayblur": Event;
-    "vrdisplayconnect": Event;
-    "vrdisplaydeactivate": Event;
-    "vrdisplaydisconnect": Event;
-    "vrdisplayfocus": Event;
-    "vrdisplaypointerrestricted": Event;
-    "vrdisplaypointerunrestricted": Event;
-    "vrdisplaypresentchange": Event;
-    "waiting": Event;
-}
-
-interface Window extends EventTarget, WindowTimers, WindowSessionStorage, WindowLocalStorage, WindowConsole, GlobalEventHandlers, IDBEnvironment, WindowBase64, GlobalFetch {
-    Blob: typeof Blob;
-    URL: typeof URL;
-    URLSearchParams: typeof URLSearchParams;
-    readonly applicationCache: ApplicationCache;
-    readonly caches: CacheStorage;
-    readonly clientInformation: Navigator;
-    readonly closed: boolean;
-    readonly crypto: Crypto;
-    customElements: CustomElementRegistry;
-    defaultStatus: string;
-    readonly devicePixelRatio: number;
-    readonly doNotTrack: string;
-    readonly document: Document;
-    event: Event | undefined;
-    readonly external: External;
-    readonly frameElement: Element;
-    readonly frames: Window;
-    readonly history: History;
-    readonly innerHeight: number;
-    readonly innerWidth: number;
-    readonly isSecureContext: boolean;
-    readonly length: number;
-    location: Location;
-    readonly locationbar: BarProp;
-    readonly menubar: BarProp;
-    readonly msContentScript: ExtensionScriptApis;
-    readonly msCredentials: MSCredentials;
-    name: string;
-    readonly navigator: Navigator;
-    offscreenBuffering: string | boolean;
-    onabort: ((this: Window, ev: UIEvent) => any) | null;
-    onafterprint: ((this: Window, ev: Event) => any) | null;
-    onbeforeprint: ((this: Window, ev: Event) => any) | null;
-    onbeforeunload: ((this: Window, ev: BeforeUnloadEvent) => any) | null;
-    onblur: ((this: Window, ev: FocusEvent) => any) | null;
-    oncanplay: ((this: Window, ev: Event) => any) | null;
-    oncanplaythrough: ((this: Window, ev: Event) => any) | null;
-    onchange: ((this: Window, ev: Event) => any) | null;
-    onclick: ((this: Window, ev: MouseEvent) => any) | null;
-    oncompassneedscalibration: ((this: Window, ev: Event) => any) | null;
-    oncontextmenu: ((this: Window, ev: PointerEvent) => any) | null;
-    ondblclick: ((this: Window, ev: MouseEvent) => any) | null;
-    ondevicelight: ((this: Window, ev: DeviceLightEvent) => any) | null;
-    ondevicemotion: ((this: Window, ev: DeviceMotionEvent) => any) | null;
-    ondeviceorientation: ((this: Window, ev: DeviceOrientationEvent) => any) | null;
-    ondrag: ((this: Window, ev: DragEvent) => any) | null;
-    ondragend: ((this: Window, ev: DragEvent) => any) | null;
-    ondragenter: ((this: Window, ev: DragEvent) => any) | null;
-    ondragleave: ((this: Window, ev: DragEvent) => any) | null;
-    ondragover: ((this: Window, ev: DragEvent) => any) | null;
-    ondragstart: ((this: Window, ev: DragEvent) => any) | null;
-    ondrop: ((this: Window, ev: DragEvent) => any) | null;
-    ondurationchange: ((this: Window, ev: Event) => any) | null;
-    onemptied: ((this: Window, ev: Event) => any) | null;
-    onended: ((this: Window, ev: Event) => any) | null;
-    onerror: ErrorEventHandler;
-    onfocus: ((this: Window, ev: FocusEvent) => any) | null;
-    onhashchange: ((this: Window, ev: HashChangeEvent) => any) | null;
-    oninput: ((this: Window, ev: Event) => any) | null;
-    oninvalid: ((this: Window, ev: Event) => any) | null;
-    onkeydown: ((this: Window, ev: KeyboardEvent) => any) | null;
-    onkeypress: ((this: Window, ev: KeyboardEvent) => any) | null;
-    onkeyup: ((this: Window, ev: KeyboardEvent) => any) | null;
-    onload: ((this: Window, ev: Event) => any) | null;
-    onloadeddata: ((this: Window, ev: Event) => any) | null;
-    onloadedmetadata: ((this: Window, ev: Event) => any) | null;
-    onloadstart: ((this: Window, ev: Event) => any) | null;
-    onmessage: ((this: Window, ev: MessageEvent) => any) | null;
-    onmousedown: ((this: Window, ev: MouseEvent) => any) | null;
-    onmouseenter: ((this: Window, ev: MouseEvent) => any) | null;
-    onmouseleave: ((this: Window, ev: MouseEvent) => any) | null;
-    onmousemove: ((this: Window, ev: MouseEvent) => any) | null;
-    onmouseout: ((this: Window, ev: MouseEvent) => any) | null;
-    onmouseover: ((this: Window, ev: MouseEvent) => any) | null;
-    onmouseup: ((this: Window, ev: MouseEvent) => any) | null;
-    onmousewheel: ((this: Window, ev: WheelEvent) => any) | null;
-    onmsgesturechange: ((this: Window, ev: Event) => any) | null;
-    onmsgesturedoubletap: ((this: Window, ev: Event) => any) | null;
-    onmsgestureend: ((this: Window, ev: Event) => any) | null;
-    onmsgesturehold: ((this: Window, ev: Event) => any) | null;
-    onmsgesturestart: ((this: Window, ev: Event) => any) | null;
-    onmsgesturetap: ((this: Window, ev: Event) => any) | null;
-    onmsinertiastart: ((this: Window, ev: Event) => any) | null;
-    onmspointercancel: ((this: Window, ev: Event) => any) | null;
-    onmspointerdown: ((this: Window, ev: Event) => any) | null;
-    onmspointerenter: ((this: Window, ev: Event) => any) | null;
-    onmspointerleave: ((this: Window, ev: Event) => any) | null;
-    onmspointermove: ((this: Window, ev: Event) => any) | null;
-    onmspointerout: ((this: Window, ev: Event) => any) | null;
-    onmspointerover: ((this: Window, ev: Event) => any) | null;
-    onmspointerup: ((this: Window, ev: Event) => any) | null;
-    onoffline: ((this: Window, ev: Event) => any) | null;
-    ononline: ((this: Window, ev: Event) => any) | null;
-    onorientationchange: ((this: Window, ev: Event) => any) | null;
-    onpagehide: ((this: Window, ev: PageTransitionEvent) => any) | null;
-    onpageshow: ((this: Window, ev: PageTransitionEvent) => any) | null;
-    onpause: ((this: Window, ev: Event) => any) | null;
-    onplay: ((this: Window, ev: Event) => any) | null;
-    onplaying: ((this: Window, ev: Event) => any) | null;
-    onpopstate: ((this: Window, ev: PopStateEvent) => any) | null;
-    onprogress: ((this: Window, ev: ProgressEvent) => any) | null;
-    onratechange: ((this: Window, ev: Event) => any) | null;
-    onreadystatechange: ((this: Window, ev: ProgressEvent) => any) | null;
-    onreset: ((this: Window, ev: Event) => any) | null;
-    onresize: ((this: Window, ev: UIEvent) => any) | null;
-    onscroll: ((this: Window, ev: UIEvent) => any) | null;
-    onseeked: ((this: Window, ev: Event) => any) | null;
-    onseeking: ((this: Window, ev: Event) => any) | null;
-    onselect: ((this: Window, ev: UIEvent) => any) | null;
-    onstalled: ((this: Window, ev: Event) => any) | null;
-    onstorage: ((this: Window, ev: StorageEvent) => any) | null;
-    onsubmit: ((this: Window, ev: Event) => any) | null;
-    onsuspend: ((this: Window, ev: Event) => any) | null;
-    ontimeupdate: ((this: Window, ev: Event) => any) | null;
-    ontouchcancel: (ev: TouchEvent) => any;
-    ontouchend: (ev: TouchEvent) => any;
-    ontouchmove: (ev: TouchEvent) => any;
-    ontouchstart: (ev: TouchEvent) => any;
-    onunload: ((this: Window, ev: Event) => any) | null;
-    onvolumechange: ((this: Window, ev: Event) => any) | null;
-    onvrdisplayactivate: ((this: Window, ev: Event) => any) | null;
-    onvrdisplayblur: ((this: Window, ev: Event) => any) | null;
-    onvrdisplayconnect: ((this: Window, ev: Event) => any) | null;
-    onvrdisplaydeactivate: ((this: Window, ev: Event) => any) | null;
-    onvrdisplaydisconnect: ((this: Window, ev: Event) => any) | null;
-    onvrdisplayfocus: ((this: Window, ev: Event) => any) | null;
-    onvrdisplaypointerrestricted: ((this: Window, ev: Event) => any) | null;
-    onvrdisplaypointerunrestricted: ((this: Window, ev: Event) => any) | null;
-    onvrdisplaypresentchange: ((this: Window, ev: Event) => any) | null;
-    onwaiting: ((this: Window, ev: Event) => any) | null;
-    opener: any;
-    readonly orientation: string | number;
-    readonly outerHeight: number;
-    readonly outerWidth: number;
-    readonly pageXOffset: number;
-    readonly pageYOffset: number;
-    readonly parent: Window;
-    readonly performance: Performance;
-    readonly personalbar: BarProp;
-    readonly screen: Screen;
-    readonly screenLeft: number;
-    readonly screenTop: number;
-    readonly screenX: number;
-    readonly screenY: number;
-    readonly scrollX: number;
-    readonly scrollY: number;
-    readonly scrollbars: BarProp;
-    readonly self: Window;
-    readonly speechSynthesis: SpeechSynthesis;
-    status: string;
-    readonly statusbar: BarProp;
-    readonly styleMedia: StyleMedia;
-    readonly toolbar: BarProp;
-    readonly top: Window;
-    readonly window: Window;
-    alert(message?: any): void;
-    blur(): void;
-    cancelAnimationFrame(handle: number): void;
-    captureEvents(): void;
-    close(): void;
-    confirm(message?: string): boolean;
-    createImageBitmap(image: HTMLImageElement | SVGImageElement | HTMLVideoElement | HTMLCanvasElement | ImageBitmap | ImageData | Blob, options?: ImageBitmapOptions): Promise<ImageBitmap>;
-    createImageBitmap(image: HTMLImageElement | SVGImageElement | HTMLVideoElement | HTMLCanvasElement | ImageBitmap | ImageData | Blob, sx: number, sy: number, sw: number, sh: number, options?: ImageBitmapOptions): Promise<ImageBitmap>;
-    departFocus(navigationReason: NavigationReason, origin: FocusNavigationOrigin): void;
-    focus(): void;
-    getComputedStyle(elt: Element, pseudoElt?: string | null): CSSStyleDeclaration;
-    getMatchedCSSRules(elt: Element, pseudoElt?: string | null): CSSRuleList;
-    getSelection(): Selection;
-    matchMedia(mediaQuery: string): MediaQueryList;
-    moveBy(x?: number, y?: number): void;
-    moveTo(x?: number, y?: number): void;
-    msWriteProfilerMark(profilerMarkName: string): void;
-    open(url?: string, target?: string, features?: string, replace?: boolean): Window | null;
-    postMessage(message: any, targetOrigin: string, transfer?: any[]): void;
-    print(): void;
-    prompt(message?: string, _default?: string): string | null;
-    releaseEvents(): void;
-    requestAnimationFrame(callback: FrameRequestCallback): number;
-    resizeBy(x?: number, y?: number): void;
-    resizeTo(x?: number, y?: number): void;
-    scroll(options?: ScrollToOptions): void;
-    scroll(x?: number, y?: number): void;
-    scrollBy(options?: ScrollToOptions): void;
-    scrollBy(x?: number, y?: number): void;
-    scrollTo(options?: ScrollToOptions): void;
-    scrollTo(x?: number, y?: number): void;
-    stop(): void;
-    webkitCancelAnimationFrame(handle: number): void;
-    webkitConvertPointFromNodeToPage(node: Node, pt: WebKitPoint): WebKitPoint;
-    webkitConvertPointFromPageToNode(node: Node, pt: WebKitPoint): WebKitPoint;
-    webkitRequestAnimationFrame(callback: FrameRequestCallback): number;
-    addEventListener<K extends keyof WindowEventMap>(type: K, listener: (this: Window, ev: WindowEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof WindowEventMap>(type: K, listener: (this: Window, ev: WindowEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var Window: {
-    prototype: Window;
-    new(): Window;
-};
-
-interface WindowBase64 {
-    atob(encodedString: string): string;
-    btoa(rawString: string): string;
-}
-
-interface WindowConsole {
-    readonly console: Console;
-}
-
-interface WindowEventHandlersEventMap {
-    "afterprint": Event;
-    "beforeprint": Event;
-    "beforeunload": BeforeUnloadEvent;
-    "hashchange": HashChangeEvent;
-    "message": MessageEvent;
-    "offline": Event;
-    "online": Event;
-    "pagehide": PageTransitionEvent;
-    "pageshow": PageTransitionEvent;
-    "popstate": PopStateEvent;
-    "storage": StorageEvent;
-    "unload": Event;
-}
-
-interface WindowEventHandlers {
-    onafterprint: ((this: WindowEventHandlers, ev: Event) => any) | null;
-    onbeforeprint: ((this: WindowEventHandlers, ev: Event) => any) | null;
-    onbeforeunload: ((this: WindowEventHandlers, ev: BeforeUnloadEvent) => any) | null;
-    onhashchange: ((this: WindowEventHandlers, ev: HashChangeEvent) => any) | null;
-    onmessage: ((this: WindowEventHandlers, ev: MessageEvent) => any) | null;
-    onoffline: ((this: WindowEventHandlers, ev: Event) => any) | null;
-    ononline: ((this: WindowEventHandlers, ev: Event) => any) | null;
-    onpagehide: ((this: WindowEventHandlers, ev: PageTransitionEvent) => any) | null;
-    onpageshow: ((this: WindowEventHandlers, ev: PageTransitionEvent) => any) | null;
-    onpopstate: ((this: WindowEventHandlers, ev: PopStateEvent) => any) | null;
-    onstorage: ((this: WindowEventHandlers, ev: StorageEvent) => any) | null;
-    onunload: ((this: WindowEventHandlers, ev: Event) => any) | null;
-    addEventListener<K extends keyof WindowEventHandlersEventMap>(type: K, listener: (this: WindowEventHandlers, ev: WindowEventHandlersEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof WindowEventHandlersEventMap>(type: K, listener: (this: WindowEventHandlers, ev: WindowEventHandlersEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-interface WindowLocalStorage {
-    readonly localStorage: Storage;
-}
-
-interface WindowSessionStorage {
-    readonly sessionStorage: Storage;
-}
-
-interface WindowTimers extends WindowTimersExtension {
-    clearInterval(handle?: number): void;
-    clearTimeout(handle?: number): void;
-    setInterval(handler: (...args: any[]) => void, timeout: number): number;
-    setInterval(handler: any, timeout?: any, ...args: any[]): number;
-    setTimeout(handler: (...args: any[]) => void, timeout: number): number;
-    setTimeout(handler: any, timeout?: any, ...args: any[]): number;
-}
-
-interface WindowTimersExtension {
-    clearImmediate(handle: number): void;
-    setImmediate(handler: (...args: any[]) => void): number;
-    setImmediate(handler: any, ...args: any[]): number;
-}
-
-interface WorkerEventMap extends AbstractWorkerEventMap {
-    "message": MessageEvent;
-}
-
-interface Worker extends EventTarget, AbstractWorker {
-    onmessage: ((this: Worker, ev: MessageEvent) => any) | null;
-    /** @deprecated */
-    postMessage(message: any, transfer?: any[]): void;
-    terminate(): void;
-    addEventListener<K extends keyof WorkerEventMap>(type: K, listener: (this: Worker, ev: WorkerEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof WorkerEventMap>(type: K, listener: (this: Worker, ev: WorkerEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var Worker: {
-    prototype: Worker;
-    new(stringUrl: string): Worker;
-};
-
-interface WritableStream {
-    readonly locked: boolean;
-    abort(reason?: any): Promise<void>;
-    getWriter(): WritableStreamDefaultWriter;
-}
-
-declare var WritableStream: {
-    prototype: WritableStream;
-    new(underlyingSink?: UnderlyingSink, strategy?: QueuingStrategy): WritableStream;
-};
-
-interface WritableStreamDefaultController {
-    error(error?: any): void;
-}
-
-declare var WritableStreamDefaultController: {
-    prototype: WritableStreamDefaultController;
-    new(): WritableStreamDefaultController;
-};
-
-interface WritableStreamDefaultWriter {
-    readonly closed: Promise<void>;
-    readonly desiredSize: number;
-    readonly ready: Promise<void>;
-    abort(reason?: any): Promise<void>;
-    close(): Promise<void>;
-    releaseLock(): void;
-    write(chunk?: any): Promise<any>;
-}
-
-declare var WritableStreamDefaultWriter: {
-    prototype: WritableStreamDefaultWriter;
-    new(): WritableStreamDefaultWriter;
-};
-
-interface XMLDocument extends Document {
-    addEventListener<K extends keyof DocumentEventMap>(type: K, listener: (this: XMLDocument, ev: DocumentEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof DocumentEventMap>(type: K, listener: (this: XMLDocument, ev: DocumentEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var XMLDocument: {
-    prototype: XMLDocument;
-    new(): XMLDocument;
-};
-
-interface XMLHttpRequestEventMap extends XMLHttpRequestEventTargetEventMap {
-    "readystatechange": Event;
-}
-
-interface XMLHttpRequest extends EventTarget, XMLHttpRequestEventTarget {
-    msCaching: string;
-    onreadystatechange: ((this: XMLHttpRequest, ev: Event) => any) | null;
-    readonly readyState: number;
-    readonly response: any;
-    readonly responseText: string;
-    responseType: XMLHttpRequestResponseType;
-    readonly responseURL: string;
-    readonly responseXML: Document | null;
-    readonly status: number;
-    readonly statusText: string;
-    timeout: number;
-    readonly upload: XMLHttpRequestUpload;
-    withCredentials: boolean;
-    abort(): void;
-    getAllResponseHeaders(): string;
-    getResponseHeader(header: string): string | null;
-    msCachingEnabled(): boolean;
-    open(method: string, url: string, async?: boolean, user?: string | null, password?: string | null): void;
-    overrideMimeType(mime: string): void;
-    send(data?: any): void;
-    setRequestHeader(header: string, value: string): void;
-    readonly DONE: number;
-    readonly HEADERS_RECEIVED: number;
-    readonly LOADING: number;
-    readonly OPENED: number;
-    readonly UNSENT: number;
-    addEventListener<K extends keyof XMLHttpRequestEventMap>(type: K, listener: (this: XMLHttpRequest, ev: XMLHttpRequestEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof XMLHttpRequestEventMap>(type: K, listener: (this: XMLHttpRequest, ev: XMLHttpRequestEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var XMLHttpRequest: {
-    prototype: XMLHttpRequest;
-    new(): XMLHttpRequest;
-    readonly DONE: number;
-    readonly HEADERS_RECEIVED: number;
-    readonly LOADING: number;
-    readonly OPENED: number;
-    readonly UNSENT: number;
-};
-
-interface XMLHttpRequestEventTargetEventMap {
-    "abort": Event;
-    "error": ErrorEvent;
-    "load": Event;
-    "loadend": ProgressEvent;
-    "loadstart": Event;
-    "progress": ProgressEvent;
-    "timeout": ProgressEvent;
-}
-
-interface XMLHttpRequestEventTarget {
-    onabort: ((this: XMLHttpRequest, ev: Event) => any) | null;
-    onerror: ((this: XMLHttpRequest, ev: ErrorEvent) => any) | null;
-    onload: ((this: XMLHttpRequest, ev: Event) => any) | null;
-    onloadend: ((this: XMLHttpRequest, ev: ProgressEvent) => any) | null;
-    onloadstart: ((this: XMLHttpRequest, ev: Event) => any) | null;
-    onprogress: ((this: XMLHttpRequest, ev: ProgressEvent) => any) | null;
-    ontimeout: ((this: XMLHttpRequest, ev: ProgressEvent) => any) | null;
-    addEventListener<K extends keyof XMLHttpRequestEventTargetEventMap>(type: K, listener: (this: XMLHttpRequestEventTarget, ev: XMLHttpRequestEventTargetEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof XMLHttpRequestEventTargetEventMap>(type: K, listener: (this: XMLHttpRequestEventTarget, ev: XMLHttpRequestEventTargetEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-interface XMLHttpRequestUpload extends EventTarget, XMLHttpRequestEventTarget {
-    addEventListener<K extends keyof XMLHttpRequestEventTargetEventMap>(type: K, listener: (this: XMLHttpRequestUpload, ev: XMLHttpRequestEventTargetEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof XMLHttpRequestEventTargetEventMap>(type: K, listener: (this: XMLHttpRequestUpload, ev: XMLHttpRequestEventTargetEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var XMLHttpRequestUpload: {
-    prototype: XMLHttpRequestUpload;
-    new(): XMLHttpRequestUpload;
-};
-
-interface XMLSerializer {
-    serializeToString(target: Node): string;
-}
-
-declare var XMLSerializer: {
-    prototype: XMLSerializer;
-    new(): XMLSerializer;
-};
-
-interface XPathEvaluator {
-    createExpression(expression: string, resolver: XPathNSResolver): XPathExpression;
-    createNSResolver(nodeResolver?: Node): XPathNSResolver;
-    evaluate(expression: string, contextNode: Node, resolver: XPathNSResolver | null, type: number, result: XPathResult | null): XPathResult;
-}
-
-declare var XPathEvaluator: {
-    prototype: XPathEvaluator;
-    new(): XPathEvaluator;
-};
-
-interface XPathExpression {
-    evaluate(contextNode: Node, type: number, result: XPathResult | null): XPathResult;
-}
-
-declare var XPathExpression: {
-    prototype: XPathExpression;
-    new(): XPathExpression;
-};
-
-interface XPathNSResolver {
-    lookupNamespaceURI(prefix: string): string;
-}
-
-declare var XPathNSResolver: {
-    prototype: XPathNSResolver;
-    new(): XPathNSResolver;
-};
-
-interface XPathResult {
-    readonly booleanValue: boolean;
-    readonly invalidIteratorState: boolean;
-    readonly numberValue: number;
-    readonly resultType: number;
-    readonly singleNodeValue: Node;
-    readonly snapshotLength: number;
-    readonly stringValue: string;
-    iterateNext(): Node;
-    snapshotItem(index: number): Node;
-    readonly ANY_TYPE: number;
-    readonly ANY_UNORDERED_NODE_TYPE: number;
-    readonly BOOLEAN_TYPE: number;
-    readonly FIRST_ORDERED_NODE_TYPE: number;
-    readonly NUMBER_TYPE: number;
-    readonly ORDERED_NODE_ITERATOR_TYPE: number;
-    readonly ORDERED_NODE_SNAPSHOT_TYPE: number;
-    readonly STRING_TYPE: number;
-    readonly UNORDERED_NODE_ITERATOR_TYPE: number;
-    readonly UNORDERED_NODE_SNAPSHOT_TYPE: number;
-}
-
-declare var XPathResult: {
-    prototype: XPathResult;
-    new(): XPathResult;
-    readonly ANY_TYPE: number;
-    readonly ANY_UNORDERED_NODE_TYPE: number;
-    readonly BOOLEAN_TYPE: number;
-    readonly FIRST_ORDERED_NODE_TYPE: number;
-    readonly NUMBER_TYPE: number;
-    readonly ORDERED_NODE_ITERATOR_TYPE: number;
-    readonly ORDERED_NODE_SNAPSHOT_TYPE: number;
-    readonly STRING_TYPE: number;
-    readonly UNORDERED_NODE_ITERATOR_TYPE: number;
-    readonly UNORDERED_NODE_SNAPSHOT_TYPE: number;
-};
-
-interface XSLTProcessor {
-    clearParameters(): void;
-    getParameter(namespaceURI: string, localName: string): any;
-    importStylesheet(style: Node): void;
-    removeParameter(namespaceURI: string, localName: string): void;
-    reset(): void;
-    setParameter(namespaceURI: string, localName: string, value: any): void;
-    transformToDocument(source: Node): Document;
-    transformToFragment(source: Node, document: Document): DocumentFragment;
-}
-
-declare var XSLTProcessor: {
-    prototype: XSLTProcessor;
-    new(): XSLTProcessor;
-};
-
-interface webkitRTCPeerConnection extends RTCPeerConnection {
-    addEventListener<K extends keyof RTCPeerConnectionEventMap>(type: K, listener: (this: webkitRTCPeerConnection, ev: RTCPeerConnectionEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCPeerConnectionEventMap>(type: K, listener: (this: webkitRTCPeerConnection, ev: RTCPeerConnectionEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var webkitRTCPeerConnection: {
-    prototype: webkitRTCPeerConnection;
-    new(configuration: RTCConfiguration): webkitRTCPeerConnection;
-};
-
-declare type EventListenerOrEventListenerObject = EventListener | EventListenerObject;
-
-interface DecodeErrorCallback {
-    (error: DOMException): void;
-}
-
-interface DecodeSuccessCallback {
-    (decodedData: AudioBuffer): void;
-}
-
-interface ErrorEventHandler {
-    (event: Event | string, source?: string, fileno?: number, columnNumber?: number, error?: Error): void;
-}
-
-interface EventHandlerNonNull {
-    (event: Event): any;
-}
-
-interface ForEachCallback {
-    (keyId: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null, status: MediaKeyStatus): void;
-}
-
-interface FrameRequestCallback {
-    (time: number): void;
-}
-
-interface FunctionStringCallback {
-    (data: string): void;
-}
-
-interface IntersectionObserverCallback {
-    (entries: IntersectionObserverEntry[], observer: IntersectionObserver): void;
-}
-
-interface MSLaunchUriCallback {
-    (): void;
-}
-
-interface MediaQueryListListener {
-    (mql: MediaQueryList): void;
-}
-
-interface MutationCallback {
-    (mutations: MutationRecord[], observer: MutationObserver): void;
-}
-
-interface NavigatorUserMediaErrorCallback {
-    (error: MediaStreamError): void;
-}
-
-interface NavigatorUserMediaSuccessCallback {
-    (stream: MediaStream): void;
-}
-
-interface NotificationPermissionCallback {
-    (permission: NotificationPermission): void;
-}
-
-interface PositionCallback {
-    (position: Position): void;
-}
-
-interface PositionErrorCallback {
-    (error: PositionError): void;
-}
-
-interface RTCPeerConnectionErrorCallback {
-    (error: DOMError): void;
-}
-
-interface RTCSessionDescriptionCallback {
-    (sdp: RTCSessionDescription): void;
-}
-
-interface RTCStatsCallback {
-    (report: RTCStatsReport): void;
-}
-
-interface VoidFunction {
-    (): void;
-}
-
-interface WritableStreamChunkCallback {
-    (chunk: any, controller: WritableStreamDefaultController): void;
-}
-
-interface WritableStreamDefaultControllerCallback {
-    (controller: WritableStreamDefaultController): void;
-}
-
-interface WritableStreamErrorCallback {
-    (reason: string): void;
-}
-
-interface HTMLElementTagNameMap {
-    "a": HTMLAnchorElement;
-    "abbr": HTMLElement;
-    "acronym": HTMLElement;
-    "address": HTMLElement;
-    "applet": HTMLAppletElement;
-    "area": HTMLAreaElement;
-    "article": HTMLElement;
-    "aside": HTMLElement;
-    "audio": HTMLAudioElement;
-    "b": HTMLElement;
-    "base": HTMLBaseElement;
-    "basefont": HTMLBaseFontElement;
-    "bdo": HTMLElement;
-    "big": HTMLElement;
-    "blockquote": HTMLQuoteElement;
-    "body": HTMLBodyElement;
-    "br": HTMLBRElement;
-    "button": HTMLButtonElement;
-    "canvas": HTMLCanvasElement;
-    "caption": HTMLTableCaptionElement;
-    "center": HTMLElement;
-    "cite": HTMLElement;
-    "code": HTMLElement;
-    "col": HTMLTableColElement;
-    "colgroup": HTMLTableColElement;
-    "data": HTMLDataElement;
-    "datalist": HTMLDataListElement;
-    "dd": HTMLElement;
-    "del": HTMLModElement;
-    "dfn": HTMLElement;
-    "dir": HTMLDirectoryElement;
-    "div": HTMLDivElement;
-    "dl": HTMLDListElement;
-    "dt": HTMLElement;
-    "em": HTMLElement;
-    "embed": HTMLEmbedElement;
-    "fieldset": HTMLFieldSetElement;
-    "figcaption": HTMLElement;
-    "figure": HTMLElement;
-    "font": HTMLFontElement;
-    "footer": HTMLElement;
-    "form": HTMLFormElement;
-    "frame": HTMLFrameElement;
-    "frameset": HTMLFrameSetElement;
-    "h1": HTMLHeadingElement;
-    "h2": HTMLHeadingElement;
-    "h3": HTMLHeadingElement;
-    "h4": HTMLHeadingElement;
-    "h5": HTMLHeadingElement;
-    "h6": HTMLHeadingElement;
-    "head": HTMLHeadElement;
-    "header": HTMLElement;
-    "hgroup": HTMLElement;
-    "hr": HTMLHRElement;
-    "html": HTMLHtmlElement;
-    "i": HTMLElement;
-    "iframe": HTMLIFrameElement;
-    "img": HTMLImageElement;
-    "input": HTMLInputElement;
-    "ins": HTMLModElement;
-    "isindex": HTMLUnknownElement;
-    "kbd": HTMLElement;
-    "keygen": HTMLElement;
-    "label": HTMLLabelElement;
-    "legend": HTMLLegendElement;
-    "li": HTMLLIElement;
-    "link": HTMLLinkElement;
-    "listing": HTMLPreElement;
-    "map": HTMLMapElement;
-    "mark": HTMLElement;
-    "marquee": HTMLMarqueeElement;
-    "menu": HTMLMenuElement;
-    "meta": HTMLMetaElement;
-    "meter": HTMLMeterElement;
-    "nav": HTMLElement;
-    "nextid": HTMLUnknownElement;
-    "nobr": HTMLElement;
-    "noframes": HTMLElement;
-    "noscript": HTMLElement;
-    "object": HTMLObjectElement;
-    "ol": HTMLOListElement;
-    "optgroup": HTMLOptGroupElement;
-    "option": HTMLOptionElement;
-    "output": HTMLOutputElement;
-    "p": HTMLParagraphElement;
-    "param": HTMLParamElement;
-    "picture": HTMLPictureElement;
-    "plaintext": HTMLElement;
-    "pre": HTMLPreElement;
-    "progress": HTMLProgressElement;
-    "q": HTMLQuoteElement;
-    "rt": HTMLElement;
-    "ruby": HTMLElement;
-    "s": HTMLElement;
-    "samp": HTMLElement;
-    "script": HTMLScriptElement;
-    "section": HTMLElement;
-    "select": HTMLSelectElement;
-    "slot": HTMLSlotElement;
-    "small": HTMLElement;
-    "source": HTMLSourceElement;
-    "span": HTMLSpanElement;
-    "strike": HTMLElement;
-    "strong": HTMLElement;
-    "style": HTMLStyleElement;
-    "sub": HTMLElement;
-    "sup": HTMLElement;
-    "table": HTMLTableElement;
-    "tbody": HTMLTableSectionElement;
-    "td": HTMLTableDataCellElement;
-    "template": HTMLTemplateElement;
-    "textarea": HTMLTextAreaElement;
-    "tfoot": HTMLTableSectionElement;
-    "th": HTMLTableHeaderCellElement;
-    "thead": HTMLTableSectionElement;
-    "time": HTMLTimeElement;
-    "title": HTMLTitleElement;
-    "tr": HTMLTableRowElement;
-    "track": HTMLTrackElement;
-    "tt": HTMLElement;
-    "u": HTMLElement;
-    "ul": HTMLUListElement;
-    "var": HTMLElement;
-    "video": HTMLVideoElement;
-    "wbr": HTMLElement;
-    "xmp": HTMLPreElement;
-}
-
-interface SVGElementTagNameMap {
-    "circle": SVGCircleElement;
-    "clippath": SVGClipPathElement;
-    "defs": SVGDefsElement;
-    "desc": SVGDescElement;
-    "ellipse": SVGEllipseElement;
-    "feblend": SVGFEBlendElement;
-    "fecolormatrix": SVGFEColorMatrixElement;
-    "fecomponenttransfer": SVGFEComponentTransferElement;
-    "fecomposite": SVGFECompositeElement;
-    "feconvolvematrix": SVGFEConvolveMatrixElement;
-    "fediffuselighting": SVGFEDiffuseLightingElement;
-    "fedisplacementmap": SVGFEDisplacementMapElement;
-    "fedistantlight": SVGFEDistantLightElement;
-    "feflood": SVGFEFloodElement;
-    "fefunca": SVGFEFuncAElement;
-    "fefuncb": SVGFEFuncBElement;
-    "fefuncg": SVGFEFuncGElement;
-    "fefuncr": SVGFEFuncRElement;
-    "fegaussianblur": SVGFEGaussianBlurElement;
-    "feimage": SVGFEImageElement;
-    "femerge": SVGFEMergeElement;
-    "femergenode": SVGFEMergeNodeElement;
-    "femorphology": SVGFEMorphologyElement;
-    "feoffset": SVGFEOffsetElement;
-    "fepointlight": SVGFEPointLightElement;
-    "fespecularlighting": SVGFESpecularLightingElement;
-    "fespotlight": SVGFESpotLightElement;
-    "fetile": SVGFETileElement;
-    "feturbulence": SVGFETurbulenceElement;
-    "filter": SVGFilterElement;
-    "foreignobject": SVGForeignObjectElement;
-    "g": SVGGElement;
-    "image": SVGImageElement;
-    "line": SVGLineElement;
-    "lineargradient": SVGLinearGradientElement;
-    "marker": SVGMarkerElement;
-    "mask": SVGMaskElement;
-    "metadata": SVGMetadataElement;
-    "path": SVGPathElement;
-    "pattern": SVGPatternElement;
-    "polygon": SVGPolygonElement;
-    "polyline": SVGPolylineElement;
-    "radialgradient": SVGRadialGradientElement;
-    "rect": SVGRectElement;
-    "stop": SVGStopElement;
-    "svg": SVGSVGElement;
-    "switch": SVGSwitchElement;
-    "symbol": SVGSymbolElement;
-    "text": SVGTextElement;
-    "textpath": SVGTextPathElement;
-    "tspan": SVGTSpanElement;
-    "use": SVGUseElement;
-    "view": SVGViewElement;
-}
-
-/** @deprecated Directly use HTMLElementTagNameMap or SVGElementTagNameMap as appropriate, instead. */
-interface ElementTagNameMap extends HTMLElementTagNameMap, SVGElementTagNameMap { }
-
-declare var Audio: {
-    new(src?: string): HTMLAudioElement;
-};
-declare var Image: {
-    new(width?: number, height?: number): HTMLImageElement;
-};
-declare var Option: {
-    new(text?: string, value?: string, defaultSelected?: boolean, selected?: boolean): HTMLOptionElement;
-};
-declare var Blob: typeof Blob;
-declare var URL: typeof URL;
-declare var URLSearchParams: typeof URLSearchParams;
-declare var applicationCache: ApplicationCache;
-declare var caches: CacheStorage;
-declare var clientInformation: Navigator;
-declare var closed: boolean;
-declare var crypto: Crypto;
-declare var customElements: CustomElementRegistry;
-declare var defaultStatus: string;
-declare var devicePixelRatio: number;
-declare var doNotTrack: string;
-declare var document: Document;
-declare var event: Event | undefined;
-declare var external: External;
-declare var frameElement: Element;
-declare var frames: Window;
-declare var history: History;
-declare var innerHeight: number;
-declare var innerWidth: number;
-declare var isSecureContext: boolean;
-declare var length: number;
-declare var location: Location;
-declare var locationbar: BarProp;
-declare var menubar: BarProp;
-declare var msContentScript: ExtensionScriptApis;
-declare var msCredentials: MSCredentials;
-declare const name: never;
-declare var navigator: Navigator;
-declare var offscreenBuffering: string | boolean;
-declare var onabort: ((this: Window, ev: UIEvent) => any) | null;
-declare var onafterprint: ((this: Window, ev: Event) => any) | null;
-declare var onbeforeprint: ((this: Window, ev: Event) => any) | null;
-declare var onbeforeunload: ((this: Window, ev: BeforeUnloadEvent) => any) | null;
-declare var onblur: ((this: Window, ev: FocusEvent) => any) | null;
-declare var oncanplay: ((this: Window, ev: Event) => any) | null;
-declare var oncanplaythrough: ((this: Window, ev: Event) => any) | null;
-declare var onchange: ((this: Window, ev: Event) => any) | null;
-declare var onclick: ((this: Window, ev: MouseEvent) => any) | null;
-declare var oncompassneedscalibration: ((this: Window, ev: Event) => any) | null;
-declare var oncontextmenu: ((this: Window, ev: PointerEvent) => any) | null;
-declare var ondblclick: ((this: Window, ev: MouseEvent) => any) | null;
-declare var ondevicelight: ((this: Window, ev: DeviceLightEvent) => any) | null;
-declare var ondevicemotion: ((this: Window, ev: DeviceMotionEvent) => any) | null;
-declare var ondeviceorientation: ((this: Window, ev: DeviceOrientationEvent) => any) | null;
-declare var ondrag: ((this: Window, ev: DragEvent) => any) | null;
-declare var ondragend: ((this: Window, ev: DragEvent) => any) | null;
-declare var ondragenter: ((this: Window, ev: DragEvent) => any) | null;
-declare var ondragleave: ((this: Window, ev: DragEvent) => any) | null;
-declare var ondragover: ((this: Window, ev: DragEvent) => any) | null;
-declare var ondragstart: ((this: Window, ev: DragEvent) => any) | null;
-declare var ondrop: ((this: Window, ev: DragEvent) => any) | null;
-declare var ondurationchange: ((this: Window, ev: Event) => any) | null;
-declare var onemptied: ((this: Window, ev: Event) => any) | null;
-declare var onended: ((this: Window, ev: Event) => any) | null;
-declare var onerror: ErrorEventHandler;
-declare var onfocus: ((this: Window, ev: FocusEvent) => any) | null;
-declare var onhashchange: ((this: Window, ev: HashChangeEvent) => any) | null;
-declare var oninput: ((this: Window, ev: Event) => any) | null;
-declare var oninvalid: ((this: Window, ev: Event) => any) | null;
-declare var onkeydown: ((this: Window, ev: KeyboardEvent) => any) | null;
-declare var onkeypress: ((this: Window, ev: KeyboardEvent) => any) | null;
-declare var onkeyup: ((this: Window, ev: KeyboardEvent) => any) | null;
-declare var onload: ((this: Window, ev: Event) => any) | null;
-declare var onloadeddata: ((this: Window, ev: Event) => any) | null;
-declare var onloadedmetadata: ((this: Window, ev: Event) => any) | null;
-declare var onloadstart: ((this: Window, ev: Event) => any) | null;
-declare var onmessage: ((this: Window, ev: MessageEvent) => any) | null;
-declare var onmousedown: ((this: Window, ev: MouseEvent) => any) | null;
-declare var onmouseenter: ((this: Window, ev: MouseEvent) => any) | null;
-declare var onmouseleave: ((this: Window, ev: MouseEvent) => any) | null;
-declare var onmousemove: ((this: Window, ev: MouseEvent) => any) | null;
-declare var onmouseout: ((this: Window, ev: MouseEvent) => any) | null;
-declare var onmouseover: ((this: Window, ev: MouseEvent) => any) | null;
-declare var onmouseup: ((this: Window, ev: MouseEvent) => any) | null;
-declare var onmousewheel: ((this: Window, ev: WheelEvent) => any) | null;
-declare var onmsgesturechange: ((this: Window, ev: Event) => any) | null;
-declare var onmsgesturedoubletap: ((this: Window, ev: Event) => any) | null;
-declare var onmsgestureend: ((this: Window, ev: Event) => any) | null;
-declare var onmsgesturehold: ((this: Window, ev: Event) => any) | null;
-declare var onmsgesturestart: ((this: Window, ev: Event) => any) | null;
-declare var onmsgesturetap: ((this: Window, ev: Event) => any) | null;
-declare var onmsinertiastart: ((this: Window, ev: Event) => any) | null;
-declare var onmspointercancel: ((this: Window, ev: Event) => any) | null;
-declare var onmspointerdown: ((this: Window, ev: Event) => any) | null;
-declare var onmspointerenter: ((this: Window, ev: Event) => any) | null;
-declare var onmspointerleave: ((this: Window, ev: Event) => any) | null;
-declare var onmspointermove: ((this: Window, ev: Event) => any) | null;
-declare var onmspointerout: ((this: Window, ev: Event) => any) | null;
-declare var onmspointerover: ((this: Window, ev: Event) => any) | null;
-declare var onmspointerup: ((this: Window, ev: Event) => any) | null;
-declare var onoffline: ((this: Window, ev: Event) => any) | null;
-declare var ononline: ((this: Window, ev: Event) => any) | null;
-declare var onorientationchange: ((this: Window, ev: Event) => any) | null;
-declare var onpagehide: ((this: Window, ev: PageTransitionEvent) => any) | null;
-declare var onpageshow: ((this: Window, ev: PageTransitionEvent) => any) | null;
-declare var onpause: ((this: Window, ev: Event) => any) | null;
-declare var onplay: ((this: Window, ev: Event) => any) | null;
-declare var onplaying: ((this: Window, ev: Event) => any) | null;
-declare var onpopstate: ((this: Window, ev: PopStateEvent) => any) | null;
-declare var onprogress: ((this: Window, ev: ProgressEvent) => any) | null;
-declare var onratechange: ((this: Window, ev: Event) => any) | null;
-declare var onreadystatechange: ((this: Window, ev: ProgressEvent) => any) | null;
-declare var onreset: ((this: Window, ev: Event) => any) | null;
-declare var onresize: ((this: Window, ev: UIEvent) => any) | null;
-declare var onscroll: ((this: Window, ev: UIEvent) => any) | null;
-declare var onseeked: ((this: Window, ev: Event) => any) | null;
-declare var onseeking: ((this: Window, ev: Event) => any) | null;
-declare var onselect: ((this: Window, ev: UIEvent) => any) | null;
-declare var onstalled: ((this: Window, ev: Event) => any) | null;
-declare var onstorage: ((this: Window, ev: StorageEvent) => any) | null;
-declare var onsubmit: ((this: Window, ev: Event) => any) | null;
-declare var onsuspend: ((this: Window, ev: Event) => any) | null;
-declare var ontimeupdate: ((this: Window, ev: Event) => any) | null;
-declare var ontouchcancel: (ev: TouchEvent) => any;
-declare var ontouchend: (ev: TouchEvent) => any;
-declare var ontouchmove: (ev: TouchEvent) => any;
-declare var ontouchstart: (ev: TouchEvent) => any;
-declare var onunload: ((this: Window, ev: Event) => any) | null;
-declare var onvolumechange: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplayactivate: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplayblur: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplayconnect: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplaydeactivate: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplaydisconnect: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplayfocus: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplaypointerrestricted: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplaypointerunrestricted: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplaypresentchange: ((this: Window, ev: Event) => any) | null;
-declare var onwaiting: ((this: Window, ev: Event) => any) | null;
-declare var opener: any;
-declare var orientation: string | number;
-declare var outerHeight: number;
-declare var outerWidth: number;
-declare var pageXOffset: number;
-declare var pageYOffset: number;
-declare var parent: Window;
-declare var performance: Performance;
-declare var personalbar: BarProp;
-declare var screen: Screen;
-declare var screenLeft: number;
-declare var screenTop: number;
-declare var screenX: number;
-declare var screenY: number;
-declare var scrollX: number;
-declare var scrollY: number;
-declare var scrollbars: BarProp;
-declare var self: Window;
-declare var speechSynthesis: SpeechSynthesis;
-declare var status: string;
-declare var statusbar: BarProp;
-declare var styleMedia: StyleMedia;
-declare var toolbar: BarProp;
-declare var top: Window;
-declare var window: Window;
-declare function alert(message?: any): void;
-declare function blur(): void;
-declare function cancelAnimationFrame(handle: number): void;
-declare function captureEvents(): void;
-declare function close(): void;
-declare function confirm(message?: string): boolean;
-declare function createImageBitmap(image: HTMLImageElement | SVGImageElement | HTMLVideoElement | HTMLCanvasElement | ImageBitmap | ImageData | Blob, options?: ImageBitmapOptions): Promise<ImageBitmap>;
-declare function createImageBitmap(image: HTMLImageElement | SVGImageElement | HTMLVideoElement | HTMLCanvasElement | ImageBitmap | ImageData | Blob, sx: number, sy: number, sw: number, sh: number, options?: ImageBitmapOptions): Promise<ImageBitmap>;
-declare function departFocus(navigationReason: NavigationReason, origin: FocusNavigationOrigin): void;
-declare function focus(): void;
-declare function getComputedStyle(elt: Element, pseudoElt?: string | null): CSSStyleDeclaration;
-declare function getMatchedCSSRules(elt: Element, pseudoElt?: string | null): CSSRuleList;
-declare function getSelection(): Selection;
-declare function matchMedia(mediaQuery: string): MediaQueryList;
-declare function moveBy(x?: number, y?: number): void;
-declare function moveTo(x?: number, y?: number): void;
-declare function msWriteProfilerMark(profilerMarkName: string): void;
-declare function open(url?: string, target?: string, features?: string, replace?: boolean): Window | null;
-declare function postMessage(message: any, targetOrigin: string, transfer?: any[]): void;
-declare function print(): void;
-declare function prompt(message?: string, _default?: string): string | null;
-declare function releaseEvents(): void;
-declare function requestAnimationFrame(callback: FrameRequestCallback): number;
-declare function resizeBy(x?: number, y?: number): void;
-declare function resizeTo(x?: number, y?: number): void;
-declare function scroll(options?: ScrollToOptions): void;
-declare function scroll(x?: number, y?: number): void;
-declare function scrollBy(options?: ScrollToOptions): void;
-declare function scrollBy(x?: number, y?: number): void;
-declare function scrollTo(options?: ScrollToOptions): void;
-declare function scrollTo(x?: number, y?: number): void;
-declare function stop(): void;
-declare function webkitCancelAnimationFrame(handle: number): void;
-declare function webkitConvertPointFromNodeToPage(node: Node, pt: WebKitPoint): WebKitPoint;
-declare function webkitConvertPointFromPageToNode(node: Node, pt: WebKitPoint): WebKitPoint;
-declare function webkitRequestAnimationFrame(callback: FrameRequestCallback): number;
-declare function toString(): string;
-declare function dispatchEvent(evt: Event): boolean;
-declare function clearInterval(handle?: number): void;
-declare function clearTimeout(handle?: number): void;
-declare function setInterval(handler: (...args: any[]) => void, timeout: number): number;
-declare function setInterval(handler: any, timeout?: any, ...args: any[]): number;
-declare function setTimeout(handler: (...args: any[]) => void, timeout: number): number;
-declare function setTimeout(handler: any, timeout?: any, ...args: any[]): number;
-declare function clearImmediate(handle: number): void;
-declare function setImmediate(handler: (...args: any[]) => void): number;
-declare function setImmediate(handler: any, ...args: any[]): number;
-declare var sessionStorage: Storage;
-declare var localStorage: Storage;
-declare var console: Console;
-declare var onpointercancel: ((this: Window, ev: PointerEvent) => any) | null;
-declare var onpointerdown: ((this: Window, ev: PointerEvent) => any) | null;
-declare var onpointerenter: ((this: Window, ev: PointerEvent) => any) | null;
-declare var onpointerleave: ((this: Window, ev: PointerEvent) => any) | null;
-declare var onpointermove: ((this: Window, ev: PointerEvent) => any) | null;
-declare var onpointerout: ((this: Window, ev: PointerEvent) => any) | null;
-declare var onpointerover: ((this: Window, ev: PointerEvent) => any) | null;
-declare var onpointerup: ((this: Window, ev: PointerEvent) => any) | null;
-declare var onwheel: ((this: Window, ev: WheelEvent) => any) | null;
-declare var indexedDB: IDBFactory;
-declare function atob(encodedString: string): string;
-declare function btoa(rawString: string): string;
-declare function fetch(input?: Request | string, init?: RequestInit): Promise<Response>;
-declare function addEventListener<K extends keyof WindowEventMap>(type: K, listener: (this: Window, ev: WindowEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-declare function addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-declare function removeEventListener<K extends keyof WindowEventMap>(type: K, listener: (this: Window, ev: WindowEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-declare function removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-type ScrollBehavior = "auto" | "instant" | "smooth";
-type ScrollLogicalPosition = "start" | "center" | "end" | "nearest";
-type MouseWheelEvent = WheelEvent;
-type ScrollRestoration = "auto" | "manual";
-type FormDataEntryValue = string | File;
-type InsertPosition = "beforebegin" | "afterbegin" | "beforeend" | "afterend";
-type HeadersInit = Headers | string[][] | { [key: string]: string };
-type OrientationLockType = "any" | "natural" | "portrait" | "landscape" | "portrait-primary" | "portrait-secondary" | "landscape-primary"| "landscape-secondary";
-type IDBValidKey = number | string | Date | IDBArrayKey;
-type AlgorithmIdentifier = string | Algorithm;
-type MutationRecordType = "attributes" | "characterData" | "childList";
-type AAGUID = string;
-type BodyInit = any;
-type ByteString = string;
-type ConstrainBoolean = boolean | ConstrainBooleanParameters;
-type ConstrainDOMString = string | string[] | ConstrainDOMStringParameters;
-type ConstrainDouble = number | ConstrainDoubleRange;
-type ConstrainLong = number | ConstrainLongRange;
-type CryptoOperationData = ArrayBufferView;
-type GLbitfield = number;
-type GLboolean = boolean;
-type GLbyte = number;
-type GLclampf = number;
-type GLenum = number;
-type GLfloat = number;
-type GLint = number;
-type GLintptr = number;
-type GLshort = number;
-type GLsizei = number;
-type GLsizeiptr = number;
-type GLubyte = number;
-type GLuint = number;
-type GLushort = number;
-type IDBKeyPath = string;
-type MSInboundPayload = MSVideoRecvPayload | MSAudioRecvPayload;
-type MSLocalClientEvent = MSLocalClientEventBase | MSAudioLocalClientEvent;
-type MSOutboundPayload = MSVideoSendPayload | MSAudioSendPayload;
-type RTCIceGatherCandidate = RTCIceCandidateDictionary | RTCIceCandidateComplete;
-type RTCTransport = RTCDtlsTransport | RTCSrtpSdesTransport;
-type RequestInfo = Request | string;
-type USVString = string;
-type payloadtype = number;
-type BufferSource = ArrayBuffer | ArrayBufferView;
-type ClientTypes = "window" | "worker" | "sharedworker" | "all";
-type AppendMode = "segments" | "sequence";
-type AudioContextLatencyCategory = "balanced" | "interactive" | "playback";
-type AudioContextState = "suspended" | "running" | "closed";
-type BinaryType = "blob" | "arraybuffer";
-type BiquadFilterType = "lowpass" | "highpass" | "bandpass" | "lowshelf" | "highshelf" | "peaking" | "notch" | "allpass";
-type CanPlayTypeResult = "" | "maybe" | "probably";
-type CanvasFillRule = "nonzero" | "evenodd";
-type ChannelCountMode = "max" | "clamped-max" | "explicit";
-type ChannelInterpretation = "speakers" | "discrete";
-type DisplayCaptureSurfaceType = "monitor" | "window" | "application" | "browser";
-type DistanceModelType = "linear" | "inverse" | "exponential";
-type DocumentReadyState = "loading" | "interactive" | "complete";
-type EndOfStreamError = "network" | "decode";
-type ExpandGranularity = "character" | "word" | "sentence" | "textedit";
-type GamepadHand = "" | "left" | "right";
-type GamepadHapticActuatorType = "vibration";
-type GamepadInputEmulationType = "mouse" | "keyboard" | "gamepad";
-type GamepadMappingType = "" | "standard";
-type IDBCursorDirection = "next" | "nextunique" | "prev" | "prevunique";
-type IDBRequestReadyState = "pending" | "done";
-type IDBTransactionMode = "readonly" | "readwrite" | "versionchange";
-type KeyFormat = "raw" | "spki" | "pkcs8" | "jwk";
-type KeyType = "public" | "private" | "secret";
-type KeyUsage = "encrypt" | "decrypt" | "sign" | "verify" | "deriveKey" | "deriveBits" | "wrapKey" | "unwrapKey";
-type ListeningState = "inactive" | "active" | "disambiguation";
-type MSCredentialType = "FIDO_2_0";
-type MSIceAddrType = "os" | "stun" | "turn" | "peer-derived";
-type MSIceType = "failed" | "direct" | "relay";
-type MSStatsType = "description" | "localclientevent" | "inbound-network" | "outbound-network" | "inbound-payload" | "outbound-payload" | "transportdiagnostics";
-type MSTransportType = "Embedded" | "USB" | "NFC" | "BT";
-type MSWebViewPermissionState = "unknown" | "defer" | "allow" | "deny";
-type MSWebViewPermissionType = "geolocation" | "unlimitedIndexedDBQuota" | "media" | "pointerlock" | "webnotifications";
-type MediaDeviceKind = "audioinput" | "audiooutput" | "videoinput";
-type MediaKeyMessageType = "license-request" | "license-renewal" | "license-release" | "individualization-request";
-type MediaKeySessionType = "temporary" | "persistent-license" | "persistent-release-message";
-type MediaKeyStatus = "usable" | "expired" | "output-downscaled" | "output-not-allowed" | "status-pending" | "internal-error";
-type MediaKeysRequirement = "required" | "optional" | "not-allowed";
-type MediaStreamTrackState = "live" | "ended";
-type NavigationReason = "up" | "down" | "left" | "right";
-type NavigationType = "navigate" | "reload" | "back_forward" | "prerender";
-type NotificationDirection = "auto" | "ltr" | "rtl";
-type NotificationPermission = "default" | "denied" | "granted";
-type OscillatorType = "sine" | "square" | "sawtooth" | "triangle" | "custom";
-type OverSampleType = "none" | "2x" | "4x";
-type PanningModelType = "equalpower" | "HRTF";
-type PaymentComplete = "success" | "fail" | "unknown";
-type PaymentShippingType = "shipping" | "delivery" | "pickup";
-type PushEncryptionKeyName = "p256dh" | "auth";
-type PushPermissionState = "granted" | "denied" | "prompt";
-type RTCBundlePolicy = "balanced" | "max-compat" | "max-bundle";
-type RTCDegradationPreference = "maintain-framerate" | "maintain-resolution" | "balanced";
-type RTCDtlsRole = "auto" | "client" | "server";
-type RTCDtlsTransportState = "new" | "connecting" | "connected" | "closed";
-type RTCIceCandidateType = "host" | "srflx" | "prflx" | "relay";
-type RTCIceComponent = "RTP" | "RTCP";
-type RTCIceConnectionState = "new" | "checking" | "connected" | "completed" | "failed" | "disconnected" | "closed";
-type RTCIceGatherPolicy = "all" | "nohost" | "relay";
-type RTCIceGathererState = "new" | "gathering" | "complete";
-type RTCIceGatheringState = "new" | "gathering" | "complete";
-type RTCIceProtocol = "udp" | "tcp";
-type RTCIceRole = "controlling" | "controlled";
-type RTCIceTcpCandidateType = "active" | "passive" | "so";
-type RTCIceTransportPolicy = "none" | "relay" | "all";
-type RTCIceTransportState = "new" | "checking" | "connected" | "completed" | "disconnected" | "closed";
-type RTCSdpType = "offer" | "pranswer" | "answer";
-type RTCSignalingState = "stable" | "have-local-offer" | "have-remote-offer" | "have-local-pranswer" | "have-remote-pranswer" | "closed";
-type RTCStatsIceCandidatePairState = "frozen" | "waiting" | "inprogress" | "failed" | "succeeded" | "cancelled";
-type RTCStatsIceCandidateType = "host" | "serverreflexive" | "peerreflexive" | "relayed";
-type RTCStatsType = "inboundrtp" | "outboundrtp" | "session" | "datachannel" | "track" | "transport" | "candidatepair" | "localcandidate" | "remotecandidate";
-type ReadyState = "closed" | "open" | "ended";
-type ReferrerPolicy = "" | "no-referrer" | "no-referrer-when-downgrade" | "origin-only" | "origin-when-cross-origin" | "unsafe-url";
-type RequestCache = "default" | "no-store" | "reload" | "no-cache" | "force-cache";
-type RequestCredentials = "omit" | "same-origin" | "include";
-type RequestDestination = "" | "document" | "sharedworker" | "subresource" | "unknown" | "worker";
-type RequestMode = "navigate" | "same-origin" | "no-cors" | "cors";
-type RequestRedirect = "follow" | "error" | "manual";
-type RequestType = "" | "audio" | "font" | "image" | "script" | "style" | "track" | "video";
-type ResponseType = "basic" | "cors" | "default" | "error" | "opaque" | "opaqueredirect";
-type ScopedCredentialType = "ScopedCred";
-type ServiceWorkerState = "installing" | "installed" | "activating" | "activated" | "redundant";
-type TextTrackKind = "subtitles" | "captions" | "descriptions" | "chapters" | "metadata";
-type TextTrackMode = "disabled" | "hidden" | "showing";
-type Transport = "usb" | "nfc" | "ble";
-type VRDisplayEventReason = "mounted" | "navigation" | "requested" | "unmounted";
-type VREye = "left" | "right";
-type VideoFacingModeEnum = "user" | "environment" | "left" | "right";
-type VisibilityState = "hidden" | "visible" | "prerender" | "unloaded";
-type XMLHttpRequestResponseType = "" | "arraybuffer" | "blob" | "document" | "json" | "text";
-
-
-/////////////////////////////
-/// WorkerGlobalScope APIs
-/////////////////////////////
-// These are only available in a Web Worker
-declare function importScripts(...urls: string[]): void;
-
-
-
-
-/////////////////////////////
-/// Windows Script Host APIS
-/////////////////////////////
-
-
-interface ActiveXObject {
-    new (s: string): any;
-}
-declare var ActiveXObject: ActiveXObject;
-
-interface ITextWriter {
-    Write(s: string): void;
-    WriteLine(s: string): void;
-    Close(): void;
-}
-
-interface TextStreamBase {
-    /**
-     * The column number of the current character position in an input stream.
-     */
-    Column: number;
-
-    /**
-     * The current line number in an input stream.
-     */
-    Line: number;
-
-    /**
-     * Closes a text stream.
-     * It is not necessary to close standard streams; they close automatically when the process ends. If
-     * you close a standard stream, be aware that any other pointers to that standard stream become invalid.
-     */
-    Close(): void;
-}
-
-interface TextStreamWriter extends TextStreamBase {
-    /**
-     * Sends a string to an output stream.
-     */
-    Write(s: string): void;
-
-    /**
-     * Sends a specified number of blank lines (newline characters) to an output stream.
-     */
-    WriteBlankLines(intLines: number): void;
-
-    /**
-     * Sends a string followed by a newline character to an output stream.
-     */
-    WriteLine(s: string): void;
-}
-
-interface TextStreamReader extends TextStreamBase {
-    /**
-     * Returns a specified number of characters from an input stream, starting at the current pointer position.
-     * Does not return until the ENTER key is pressed.
-     * Can only be used on a stream in reading mode; causes an error in writing or appending mode.
-     */
-    Read(characters: number): string;
-
-    /**
-     * Returns all characters from an input stream.
-     * Can only be used on a stream in reading mode; causes an error in writing or appending mode.
-     */
-    ReadAll(): string;
-
-    /**
-     * Returns an entire line from an input stream.
-     * Although this method extracts the newline character, it does not add it to the returned string.
-     * Can only be used on a stream in reading mode; causes an error in writing or appending mode.
-     */
-    ReadLine(): string;
-
-    /**
-     * Skips a specified number of characters when reading from an input text stream.
-     * Can only be used on a stream in reading mode; causes an error in writing or appending mode.
-     * @param characters Positive number of characters to skip forward. (Backward skipping is not supported.)
-     */
-    Skip(characters: number): void;
-
-    /**
-     * Skips the next line when reading from an input text stream.
-     * Can only be used on a stream in reading mode, not writing or appending mode.
-     */
-    SkipLine(): void;
-
-    /**
-     * Indicates whether the stream pointer position is at the end of a line.
-     */
-    AtEndOfLine: boolean;
-
-    /**
-     * Indicates whether the stream pointer position is at the end of a stream.
-     */
-    AtEndOfStream: boolean;
-}
-
-declare var WScript: {
-    /**
-     * Outputs text to either a message box (under WScript.exe) or the command console window followed by
-     * a newline (under CScript.exe).
-     */
-    Echo(s: any): void;
-
-    /**
-     * Exposes the write-only error output stream for the current script.
-     * Can be accessed only while using CScript.exe.
-     */
-    StdErr: TextStreamWriter;
-
-    /**
-     * Exposes the write-only output stream for the current script.
-     * Can be accessed only while using CScript.exe.
-     */
-    StdOut: TextStreamWriter;
-    Arguments: { length: number; Item(n: number): string; };
-
-    /**
-     *  The full path of the currently running script.
-     */
-    ScriptFullName: string;
-
-    /**
-     * Forces the script to stop immediately, with an optional exit code.
-     */
-    Quit(exitCode?: number): number;
-
-    /**
-     * The Windows Script Host build version number.
-     */
-    BuildVersion: number;
-
-    /**
-     * Fully qualified path of the host executable.
-     */
-    FullName: string;
-
-    /**
-     * Gets/sets the script mode - interactive(true) or batch(false).
-     */
-    Interactive: boolean;
-
-    /**
-     * The name of the host executable (WScript.exe or CScript.exe).
-     */
-    Name: string;
-
-    /**
-     * Path of the directory containing the host executable.
-     */
-    Path: string;
-
-    /**
-     * The filename of the currently running script.
-     */
-    ScriptName: string;
-
-    /**
-     * Exposes the read-only input stream for the current script.
-     * Can be accessed only while using CScript.exe.
-     */
-    StdIn: TextStreamReader;
-
-    /**
-     * Windows Script Host version
-     */
-    Version: string;
-
-    /**
-     * Connects a COM object's event sources to functions named with a given prefix, in the form prefix_event.
-     */
-    ConnectObject(objEventSource: any, strPrefix: string): void;
-
-    /**
-     * Creates a COM object.
-     * @param strProgiID
-     * @param strPrefix Function names in the form prefix_event will be bound to this object's COM events.
-     */
-    CreateObject(strProgID: string, strPrefix?: string): any;
-
-    /**
-     * Disconnects a COM object from its event sources.
-     */
-    DisconnectObject(obj: any): void;
-
-    /**
-     * Retrieves an existing object with the specified ProgID from memory, or creates a new one from a file.
-     * @param strPathname Fully qualified path to the file containing the object persisted to disk.
-     *                       For objects in memory, pass a zero-length string.
-     * @param strProgID
-     * @param strPrefix Function names in the form prefix_event will be bound to this object's COM events.
-     */
-    GetObject(strPathname: string, strProgID?: string, strPrefix?: string): any;
-
-    /**
-     * Suspends script execution for a specified length of time, then continues execution.
-     * @param intTime Interval (in milliseconds) to suspend script execution.
-     */
-    Sleep(intTime: number): void;
-};
-
-/**
- * WSH is an alias for WScript under Windows Script Host
- */
-declare var WSH: typeof WScript;
-
-/**
- * Represents an Automation SAFEARRAY
- */
-declare class SafeArray<T = any> {
-    private constructor();
-    private SafeArray_typekey: SafeArray<T>;
-}
-
-/**
- * Allows enumerating over a COM collection, which may not have indexed item access.
- */
-interface Enumerator<T = any> {
-    /**
-     * Returns true if the current item is the last one in the collection, or the collection is empty,
-     * or the current item is undefined.
-     */
-    atEnd(): boolean;
-
-    /**
-     * Returns the current item in the collection
-     */
-    item(): T;
-
-    /**
-     * Resets the current item in the collection to the first item. If there are no items in the collection,
-     * the current item is set to undefined.
-     */
-    moveFirst(): void;
-
-    /**
-     * Moves the current item to the next item in the collection. If the enumerator is at the end of
-     * the collection or the collection is empty, the current item is set to undefined.
-     */
-    moveNext(): void;
-}
-
-interface EnumeratorConstructor {
-    new <T = any>(safearray: SafeArray<T>): Enumerator<T>;
-    new <T = any>(collection: { Item(index: any): T }): Enumerator<T>;
-    new <T = any>(collection: any): Enumerator<T>;
-}
-
-declare var Enumerator: EnumeratorConstructor;
-
-/**
- * Enables reading from a COM safe array, which might have an alternate lower bound, or multiple dimensions.
- */
-interface VBArray<T = any> {
-    /**
-     * Returns the number of dimensions (1-based).
-     */
-    dimensions(): number;
-
-    /**
-     * Takes an index for each dimension in the array, and returns the item at the corresponding location.
-     */
-    getItem(dimension1Index: number, ...dimensionNIndexes: number[]): T;
-
-    /**
-     * Returns the smallest available index for a given dimension.
-     * @param dimension 1-based dimension (defaults to 1)
-     */
-    lbound(dimension?: number): number;
-
-    /**
-     * Returns the largest available index for a given dimension.
-     * @param dimension 1-based dimension (defaults to 1)
-     */
-    ubound(dimension?: number): number;
-
-    /**
-     * Returns a Javascript array with all the elements in the VBArray. If there are multiple dimensions,
-     * each successive dimension is appended to the end of the array.
-     * Example: [[1,2,3],[4,5,6]] becomes [1,2,3,4,5,6]
-     */
-    toArray(): T[];
-}
-
-interface VBArrayConstructor {
-    new <T = any>(safeArray: SafeArray<T>): VBArray<T>;
-}
-
-declare var VBArray: VBArrayConstructor;
-
-/**
- * Automation date (VT_DATE)
- */
-declare class VarDate {
-    private constructor();
-    private VarDate_typekey: VarDate;
-}
-
-interface DateConstructor {
-    new (vd: VarDate): Date;
-}
-
-interface Date {
-    getVarDate: () => VarDate;
-}
-
-
-/// <reference path="lib.dom.d.ts" />
-
-interface DOMTokenList {
-    [Symbol.iterator](): IterableIterator<string>;
-}
-
-interface Headers {
-    [Symbol.iterator](): IterableIterator<[string, string]>;
-    /**
-     * Returns an iterator allowing to go through all key/value pairs contained in this object.
-     */
-    entries(): IterableIterator<[string, string]>;
-    /**
-     * Returns an iterator allowing to go through all keys f the key/value pairs contained in this object.
-     */
-    keys(): IterableIterator<string>;
-    /**
-     * Returns an iterator allowing to go through all values of the key/value pairs contained in this object.
-     */
-    values(): IterableIterator<string>;
-}
-
-interface NodeList {
-    /**
-     * Returns an array of key, value pairs for every entry in the list
-     */
-    entries(): IterableIterator<[number, Node]>;
-    /**
-     * Performs the specified action for each node in an list.
-     * @param callbackfn  A function that accepts up to three arguments. forEach calls the callbackfn function one time for each element in the list.
-     * @param thisArg  An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
-     */
-    forEach(callbackfn: (value: Node, index: number, listObj: NodeList) => void, thisArg?: any): void;
-    /**
-     * Returns an list of keys in the list
-     */
-    keys(): IterableIterator<number>;
-
-    /**
-     * Returns an list of values in the list
-     */
-    values(): IterableIterator<Node>;
-
-
-    [Symbol.iterator](): IterableIterator<Node>;
-}
-
-interface NodeListOf<TNode extends Node> {
-
-    /**
-     * Returns an array of key, value pairs for every entry in the list
-     */
-    entries(): IterableIterator<[number, TNode]>;
-
-    /**
-     * Performs the specified action for each node in an list.
-     * @param callbackfn  A function that accepts up to three arguments. forEach calls the callbackfn function one time for each element in the list.
-     * @param thisArg  An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
-     */
-    forEach(callbackfn: (value: TNode, index: number, listObj: NodeListOf<TNode>) => void, thisArg?: any): void;
-    /**
-     * Returns an list of keys in the list
-     */
-    keys(): IterableIterator<number>;
-    /**
-     * Returns an list of values in the list
-     */
-    values(): IterableIterator<TNode>;
-
-    [Symbol.iterator](): IterableIterator<TNode>;
-}
-
-interface HTMLCollectionBase {
-    [Symbol.iterator](): IterableIterator<Element>;
-}
-
-interface HTMLCollectionOf<T extends Element> {
-    [Symbol.iterator](): IterableIterator<T>;
-}
-
-interface FormData {
-    /**
-     * Returns an array of key, value pairs for every entry in the list
-     */
-    entries(): IterableIterator<[string, string | File]>;
-    /**
-     * Returns a list of keys in the list
-     */
-    keys(): IterableIterator<string>;
-    /**
-     * Returns a list of values in the list
-     */
-    values(): IterableIterator<string | File>;
-
-    [Symbol.iterator](): IterableIterator<string | File>;
-}
-
-interface URLSearchParams {
-    /**
-     * Returns an array of key, value pairs for every entry in the search params
-     */
-    entries(): IterableIterator<[string, string]>;
-    /**
-     * Returns a list of keys in the search params
-     */
-    keys(): IterableIterator<string>;
-    /**
-     * Returns a list of values in the search params
-     */
-    values(): IterableIterator<string>;
-    /**
-     * iterate over key/value pairs
-     */
-    [Symbol.iterator](): IterableIterator<[string, string]>;
-}
+/// <reference lib="es2017" />
+/// <reference lib="dom" />
+/// <reference lib="webworker.importscripts" />
+/// <reference lib="scripthost" />
+/// <reference lib="dom.iterable" />
\ No newline at end of file
diff --git a/lib/lib.es2017.sharedmemory.d.ts b/lib/lib.es2017.sharedmemory.d.ts
index 50a38686a90..ef304d3c1f7 100644
--- a/lib/lib.es2017.sharedmemory.d.ts
+++ b/lib/lib.es2017.sharedmemory.d.ts
@@ -18,8 +18,8 @@ and limitations under the License.
 /// <reference no-default-lib="true"/>
 
 
-/// <reference path="lib.es2015.symbol.d.ts" />
-/// <reference path="lib.es2015.symbol.wellknown.d.ts" />
+/// <reference lib="es2015.symbol" />
+/// <reference lib="es2015.symbol.wellknown" />
 
 interface SharedArrayBuffer {
     /**
diff --git a/lib/lib.es2018.d.ts b/lib/lib.es2018.d.ts
index 59897aa70e2..2a694e35e6c 100644
--- a/lib/lib.es2018.d.ts
+++ b/lib/lib.es2018.d.ts
@@ -18,7 +18,7 @@ and limitations under the License.
 /// <reference no-default-lib="true"/>
 
 
-/// <reference path="lib.es2017.d.ts" />
-/// <reference path="lib.es2018.promise.d.ts" />
-/// <reference path="lib.es2018.regexp.d.ts" />
-/// <reference path="lib.es2018.intl.d.ts" />
+/// <reference lib="es2017" />
+/// <reference lib="es2018.promise" />
+/// <reference lib="es2018.regexp" />
+/// <reference lib="es2018.intl" />
diff --git a/lib/lib.es2018.full.d.ts b/lib/lib.es2018.full.d.ts
index 9454d1e486b..277d5411fa6 100644
--- a/lib/lib.es2018.full.d.ts
+++ b/lib/lib.es2018.full.d.ts
@@ -18,16511 +18,8 @@ and limitations under the License.
 /// <reference no-default-lib="true"/>
 
 
-/// <reference path="lib.es2017.d.ts" />
-/// <reference path="lib.es2018.promise.d.ts" />
-/// <reference path="lib.es2018.regexp.d.ts" />
-/// <reference path="lib.es2018.intl.d.ts" />
-
-
-/////////////////////////////
-/// DOM APIs
-/////////////////////////////
-
-interface Account {
-    displayName: string;
-    id: string;
-    imageURL?: string;
-    name?: string;
-    rpDisplayName: string;
-}
-
-interface AddEventListenerOptions extends EventListenerOptions {
-    once?: boolean;
-    passive?: boolean;
-}
-
-interface AesCbcParams extends Algorithm {
-    iv: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-}
-
-interface AesCtrParams extends Algorithm {
-    counter: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-    length: number;
-}
-
-interface AesDerivedKeyParams extends Algorithm {
-    length: number;
-}
-
-interface AesGcmParams extends Algorithm {
-    additionalData?: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-    iv: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-    tagLength?: number;
-}
-
-interface AesKeyAlgorithm extends KeyAlgorithm {
-    length: number;
-}
-
-interface AesKeyGenParams extends Algorithm {
-    length: number;
-}
-
-interface Algorithm {
-    name: string;
-}
-
-interface AnalyserOptions extends AudioNodeOptions {
-    fftSize?: number;
-    maxDecibels?: number;
-    minDecibels?: number;
-    smoothingTimeConstant?: number;
-}
-
-interface AnimationEventInit extends EventInit {
-    animationName?: string;
-    elapsedTime?: number;
-}
-
-interface AssertionOptions {
-    allowList?: ScopedCredentialDescriptor[];
-    extensions?: WebAuthnExtensions;
-    rpId?: string;
-    timeoutSeconds?: number;
-}
-
-interface AudioBufferOptions {
-    length: number;
-    numberOfChannels?: number;
-    sampleRate: number;
-}
-
-interface AudioBufferSourceOptions {
-    buffer?: AudioBuffer | null;
-    detune?: number;
-    loop?: boolean;
-    loopEnd?: number;
-    loopStart?: number;
-    playbackRate?: number;
-}
-
-interface AudioContextInfo {
-    currentTime?: number;
-    sampleRate?: number;
-}
-
-interface AudioContextOptions {
-    latencyHint?: AudioContextLatencyCategory | number;
-    sampleRate?: number;
-}
-
-interface AudioNodeOptions {
-    channelCount?: number;
-    channelCountMode?: ChannelCountMode;
-    channelInterpretation?: ChannelInterpretation;
-}
-
-interface AudioParamDescriptor {
-    defaultValue?: number;
-    maxValue?: number;
-    minValue?: number;
-    name?: string;
-}
-
-interface AudioProcessingEventInit extends EventInit {
-    inputBuffer: AudioBuffer;
-    outputBuffer: AudioBuffer;
-    playbackTime: number;
-}
-
-interface AudioTimestamp {
-    contextTime?: number;
-    performanceTime?: number;
-}
-
-interface BiquadFilterOptions extends AudioNodeOptions {
-    Q?: number;
-    detune?: number;
-    frequency?: number;
-    gain?: number;
-    type?: BiquadFilterType;
-}
-
-interface ByteLengthChunk {
-    byteLength?: number;
-}
-
-interface CacheQueryOptions {
-    cacheName?: string;
-    ignoreMethod?: boolean;
-    ignoreSearch?: boolean;
-    ignoreVary?: boolean;
-}
-
-interface ChannelMergerOptions extends AudioNodeOptions {
-    numberOfInputs?: number;
-}
-
-interface ChannelSplitterOptions extends AudioNodeOptions {
-    numberOfOutputs?: number;
-}
-
-interface ClientData {
-    challenge: string;
-    extensions?: WebAuthnExtensions;
-    hashAlg: string | Algorithm;
-    origin: string;
-    rpId: string;
-    tokenBinding?: string;
-}
-
-interface ClientQueryOptions {
-    includeReserved?: boolean;
-    includeUncontrolled?: boolean;
-    type?: ClientTypes;
-}
-
-interface CloseEventInit extends EventInit {
-    code?: number;
-    reason?: string;
-    wasClean?: boolean;
-}
-
-interface CompositionEventInit extends UIEventInit {
-    data?: string;
-}
-
-interface ConfirmSiteSpecificExceptionsInformation extends ExceptionInformation {
-    arrayOfDomainStrings?: string[];
-}
-
-interface ConstantSourceOptions {
-    offset?: number;
-}
-
-interface ConstrainBooleanParameters {
-    exact?: boolean;
-    ideal?: boolean;
-}
-
-interface ConstrainDOMStringParameters {
-    exact?: string | string[];
-    ideal?: string | string[];
-}
-
-interface ConstrainDoubleRange extends DoubleRange {
-    exact?: number;
-    ideal?: number;
-}
-
-interface ConstrainLongRange extends LongRange {
-    exact?: number;
-    ideal?: number;
-}
-
-interface ConstrainVideoFacingModeParameters {
-    exact?: VideoFacingModeEnum | VideoFacingModeEnum[];
-    ideal?: VideoFacingModeEnum | VideoFacingModeEnum[];
-}
-
-interface ConvolverOptions extends AudioNodeOptions {
-    buffer?: AudioBuffer | null;
-    disableNormalization?: boolean;
-}
-
-interface CustomEventInit<T = any> extends EventInit {
-    detail?: T;
-}
-
-interface DOMRectInit {
-    height?: number;
-    width?: number;
-    x?: number;
-    y?: number;
-}
-
-interface DelayOptions extends AudioNodeOptions {
-    delayTime?: number;
-    maxDelayTime?: number;
-}
-
-interface DeviceAccelerationDict {
-    x?: number | null;
-    y?: number | null;
-    z?: number | null;
-}
-
-interface DeviceLightEventInit extends EventInit {
-    value?: number;
-}
-
-interface DeviceMotionEventInit extends EventInit {
-    acceleration?: DeviceAccelerationDict | null;
-    accelerationIncludingGravity?: DeviceAccelerationDict | null;
-    interval?: number | null;
-    rotationRate?: DeviceRotationRateDict | null;
-}
-
-interface DeviceOrientationEventInit extends EventInit {
-    absolute?: boolean;
-    alpha?: number | null;
-    beta?: number | null;
-    gamma?: number | null;
-}
-
-interface DeviceRotationRateDict {
-    alpha?: number | null;
-    beta?: number | null;
-    gamma?: number | null;
-}
-
-interface DoubleRange {
-    max?: number;
-    min?: number;
-}
-
-interface DynamicsCompressorOptions extends AudioNodeOptions {
-    attack?: number;
-    knee?: number;
-    ratio?: number;
-    release?: number;
-    threshold?: number;
-}
-
-interface EcKeyAlgorithm extends KeyAlgorithm {
-    namedCurve: string;
-}
-
-interface EcKeyGenParams extends Algorithm {
-    namedCurve: string;
-}
-
-interface EcKeyImportParams extends Algorithm {
-    namedCurve: string;
-}
-
-interface EcdhKeyDeriveParams extends Algorithm {
-    public: CryptoKey;
-}
-
-interface EcdsaParams extends Algorithm {
-    hash: string | Algorithm;
-}
-
-interface ErrorEventInit extends EventInit {
-    colno?: number;
-    error?: any;
-    filename?: string;
-    lineno?: number;
-    message?: string;
-}
-
-interface EventInit {
-    bubbles?: boolean;
-    cancelable?: boolean;
-    scoped?: boolean;
-}
-
-interface EventListenerOptions {
-    capture?: boolean;
-}
-
-interface EventModifierInit extends UIEventInit {
-    altKey?: boolean;
-    ctrlKey?: boolean;
-    metaKey?: boolean;
-    modifierAltGraph?: boolean;
-    modifierCapsLock?: boolean;
-    modifierFn?: boolean;
-    modifierFnLock?: boolean;
-    modifierHyper?: boolean;
-    modifierNumLock?: boolean;
-    modifierOS?: boolean;
-    modifierScrollLock?: boolean;
-    modifierSuper?: boolean;
-    modifierSymbol?: boolean;
-    modifierSymbolLock?: boolean;
-    shiftKey?: boolean;
-}
-
-interface ExceptionInformation {
-    domain?: string | null;
-}
-
-interface ExtendableEventInit extends EventInit {
-}
-
-interface ExtendableMessageEventInit extends ExtendableEventInit {
-    data?: any;
-    lastEventId?: string;
-    origin?: string;
-    ports?: MessagePort[] | null;
-    source?: object | ServiceWorker | MessagePort | null;
-}
-
-interface FetchEventInit extends ExtendableEventInit {
-    clientId?: string;
-    request: Request;
-    reservedClientId?: string;
-    targetClientId?: string;
-}
-
-interface FocusEventInit extends UIEventInit {
-    relatedTarget?: EventTarget | null;
-}
-
-interface FocusNavigationEventInit extends EventInit {
-    navigationReason?: string | null;
-    originHeight?: number;
-    originLeft?: number;
-    originTop?: number;
-    originWidth?: number;
-}
-
-interface FocusNavigationOrigin {
-    originHeight?: number;
-    originLeft?: number;
-    originTop?: number;
-    originWidth?: number;
-}
-
-interface GainOptions extends AudioNodeOptions {
-    gain?: number;
-}
-
-interface GamepadEventInit extends EventInit {
-    gamepad?: Gamepad;
-}
-
-interface GetNotificationOptions {
-    tag?: string;
-}
-
-interface HashChangeEventInit extends EventInit {
-    newURL?: string;
-    oldURL?: string;
-}
-
-interface HkdfParams extends Algorithm {
-    hash: string | Algorithm;
-    info: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-    salt: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-}
-
-interface HmacImportParams extends Algorithm {
-    hash: string | Algorithm;
-    length?: number;
-}
-
-interface HmacKeyAlgorithm extends KeyAlgorithm {
-    hash: KeyAlgorithm;
-    length: number;
-}
-
-interface HmacKeyGenParams extends Algorithm {
-    hash: string | Algorithm;
-    length?: number;
-}
-
-interface IDBIndexParameters {
-    multiEntry?: boolean;
-    unique?: boolean;
-}
-
-interface IDBObjectStoreParameters {
-    autoIncrement?: boolean;
-    keyPath?: string | string[];
-}
-
-interface IIRFilterOptions extends AudioNodeOptions {
-    feedback: number[];
-    feedforward: number[];
-}
-
-interface IntersectionObserverEntryInit {
-    boundingClientRect: DOMRectInit;
-    intersectionRect: DOMRectInit;
-    isIntersecting: boolean;
-    rootBounds: DOMRectInit;
-    target: Element;
-    time: number;
-}
-
-interface IntersectionObserverInit {
-    root?: Element | null;
-    rootMargin?: string;
-    threshold?: number | number[];
-}
-
-interface JsonWebKey {
-    alg?: string;
-    crv?: string;
-    d?: string;
-    dp?: string;
-    dq?: string;
-    e?: string;
-    ext?: boolean;
-    k?: string;
-    key_ops?: string[];
-    kty?: string;
-    n?: string;
-    oth?: RsaOtherPrimesInfo[];
-    p?: string;
-    q?: string;
-    qi?: string;
-    use?: string;
-    x?: string;
-    y?: string;
-}
-
-interface KeyAlgorithm {
-    name: string;
-}
-
-interface KeyboardEventInit extends EventModifierInit {
-    code?: string;
-    key?: string;
-    location?: number;
-    repeat?: boolean;
-}
-
-interface LongRange {
-    max?: number;
-    min?: number;
-}
-
-interface MSAccountInfo {
-    accountImageUri?: string;
-    accountName?: string;
-    rpDisplayName: string;
-    userDisplayName: string;
-    userId?: string;
-}
-
-interface MSAudioLocalClientEvent extends MSLocalClientEventBase {
-    cpuInsufficientEventRatio?: number;
-    deviceCaptureNotFunctioningEventRatio?: number;
-    deviceClippingEventRatio?: number;
-    deviceEchoEventRatio?: number;
-    deviceGlitchesEventRatio?: number;
-    deviceHalfDuplexAECEventRatio?: number;
-    deviceHowlingEventCount?: number;
-    deviceLowSNREventRatio?: number;
-    deviceLowSpeechLevelEventRatio?: number;
-    deviceMultipleEndpointsEventCount?: number;
-    deviceNearEndToEchoRatioEventRatio?: number;
-    deviceRenderMuteEventRatio?: number;
-    deviceRenderNotFunctioningEventRatio?: number;
-    deviceRenderZeroVolumeEventRatio?: number;
-    networkDelayEventRatio?: number;
-    networkSendQualityEventRatio?: number;
-}
-
-interface MSAudioRecvPayload extends MSPayloadBase {
-    burstLossLength1?: number;
-    burstLossLength2?: number;
-    burstLossLength3?: number;
-    burstLossLength4?: number;
-    burstLossLength5?: number;
-    burstLossLength6?: number;
-    burstLossLength7?: number;
-    burstLossLength8OrHigher?: number;
-    fecRecvDistance1?: number;
-    fecRecvDistance2?: number;
-    fecRecvDistance3?: number;
-    packetReorderDepthAvg?: number;
-    packetReorderDepthMax?: number;
-    packetReorderRatio?: number;
-    ratioCompressedSamplesAvg?: number;
-    ratioConcealedSamplesAvg?: number;
-    ratioStretchedSamplesAvg?: number;
-    samplingRate?: number;
-    signal?: MSAudioRecvSignal;
-}
-
-interface MSAudioRecvSignal {
-    initialSignalLevelRMS?: number;
-    recvNoiseLevelCh1?: number;
-    recvSignalLevelCh1?: number;
-    renderLoopbackSignalLevel?: number;
-    renderNoiseLevel?: number;
-    renderSignalLevel?: number;
-}
-
-interface MSAudioSendPayload extends MSPayloadBase {
-    audioFECUsed?: boolean;
-    samplingRate?: number;
-    sendMutePercent?: number;
-    signal?: MSAudioSendSignal;
-}
-
-interface MSAudioSendSignal {
-    noiseLevel?: number;
-    sendNoiseLevelCh1?: number;
-    sendSignalLevelCh1?: number;
-}
-
-interface MSConnectivity {
-    iceType?: MSIceType;
-    iceWarningFlags?: MSIceWarningFlags;
-    relayAddress?: MSRelayAddress;
-}
-
-interface MSCredentialFilter {
-    accept?: MSCredentialSpec[];
-}
-
-interface MSCredentialParameters {
-    type?: MSCredentialType;
-}
-
-interface MSCredentialSpec {
-    id?: string;
-    type: MSCredentialType;
-}
-
-interface MSDCCEventInit extends EventInit {
-    maxFr?: number;
-    maxFs?: number;
-}
-
-interface MSDSHEventInit extends EventInit {
-    sources?: number[];
-    timestamp?: number;
-}
-
-interface MSDelay {
-    roundTrip?: number;
-    roundTripMax?: number;
-}
-
-interface MSDescription extends RTCStats {
-    connectivity?: MSConnectivity;
-    deviceDevName?: string;
-    localAddr?: MSIPAddressInfo;
-    networkconnectivity?: MSNetworkConnectivityInfo;
-    reflexiveLocalIPAddr?: MSIPAddressInfo;
-    remoteAddr?: MSIPAddressInfo;
-    transport?: RTCIceProtocol;
-}
-
-interface MSFIDOCredentialParameters extends MSCredentialParameters {
-    algorithm?: string | Algorithm;
-    authenticators?: string[];
-}
-
-interface MSIPAddressInfo {
-    ipAddr?: string;
-    manufacturerMacAddrMask?: string;
-    port?: number;
-}
-
-interface MSIceWarningFlags {
-    allocationMessageIntegrityFailed?: boolean;
-    alternateServerReceived?: boolean;
-    connCheckMessageIntegrityFailed?: boolean;
-    connCheckOtherError?: boolean;
-    fipsAllocationFailure?: boolean;
-    multipleRelayServersAttempted?: boolean;
-    noRelayServersConfigured?: boolean;
-    portRangeExhausted?: boolean;
-    pseudoTLSFailure?: boolean;
-    tcpNatConnectivityFailed?: boolean;
-    tcpRelayConnectivityFailed?: boolean;
-    turnAuthUnknownUsernameError?: boolean;
-    turnTcpAllocateFailed?: boolean;
-    turnTcpSendFailed?: boolean;
-    turnTcpTimedOut?: boolean;
-    turnTurnTcpConnectivityFailed?: boolean;
-    turnUdpAllocateFailed?: boolean;
-    turnUdpSendFailed?: boolean;
-    udpLocalConnectivityFailed?: boolean;
-    udpNatConnectivityFailed?: boolean;
-    udpRelayConnectivityFailed?: boolean;
-    useCandidateChecksFailed?: boolean;
-}
-
-interface MSJitter {
-    interArrival?: number;
-    interArrivalMax?: number;
-    interArrivalSD?: number;
-}
-
-interface MSLocalClientEventBase extends RTCStats {
-    networkBandwidthLowEventRatio?: number;
-    networkReceiveQualityEventRatio?: number;
-}
-
-interface MSNetwork extends RTCStats {
-    delay?: MSDelay;
-    jitter?: MSJitter;
-    packetLoss?: MSPacketLoss;
-    utilization?: MSUtilization;
-}
-
-interface MSNetworkConnectivityInfo {
-    linkspeed?: number;
-    networkConnectionDetails?: string;
-    vpn?: boolean;
-}
-
-interface MSNetworkInterfaceType {
-    interfaceTypeEthernet?: boolean;
-    interfaceTypePPP?: boolean;
-    interfaceTypeTunnel?: boolean;
-    interfaceTypeWWAN?: boolean;
-    interfaceTypeWireless?: boolean;
-}
-
-interface MSOutboundNetwork extends MSNetwork {
-    appliedBandwidthLimit?: number;
-}
-
-interface MSPacketLoss {
-    lossRate?: number;
-    lossRateMax?: number;
-}
-
-interface MSPayloadBase extends RTCStats {
-    payloadDescription?: string;
-}
-
-interface MSPortRange {
-    max?: number;
-    min?: number;
-}
-
-interface MSRelayAddress {
-    port?: number;
-    relayAddress?: string;
-}
-
-interface MSSignatureParameters {
-    userPrompt?: string;
-}
-
-interface MSTransportDiagnosticsStats extends RTCStats {
-    allocationTimeInMs?: number;
-    baseAddress?: string;
-    baseInterface?: MSNetworkInterfaceType;
-    iceRole?: RTCIceRole;
-    iceWarningFlags?: MSIceWarningFlags;
-    interfaces?: MSNetworkInterfaceType;
-    localAddrType?: MSIceAddrType;
-    localAddress?: string;
-    localInterface?: MSNetworkInterfaceType;
-    localMR?: string;
-    localMRTCPPort?: number;
-    localSite?: string;
-    msRtcEngineVersion?: string;
-    networkName?: string;
-    numConsentReqReceived?: number;
-    numConsentReqSent?: number;
-    numConsentRespReceived?: number;
-    numConsentRespSent?: number;
-    portRangeMax?: number;
-    portRangeMin?: number;
-    protocol?: RTCIceProtocol;
-    remoteAddrType?: MSIceAddrType;
-    remoteAddress?: string;
-    remoteMR?: string;
-    remoteMRTCPPort?: number;
-    remoteSite?: string;
-    rtpRtcpMux?: boolean;
-    stunVer?: number;
-}
-
-interface MSUtilization {
-    bandwidthEstimation?: number;
-    bandwidthEstimationAvg?: number;
-    bandwidthEstimationMax?: number;
-    bandwidthEstimationMin?: number;
-    bandwidthEstimationStdDev?: number;
-    packets?: number;
-}
-
-interface MSVideoPayload extends MSPayloadBase {
-    durationSeconds?: number;
-    resolution?: string;
-    videoBitRateAvg?: number;
-    videoBitRateMax?: number;
-    videoFrameRateAvg?: number;
-    videoPacketLossRate?: number;
-}
-
-interface MSVideoRecvPayload extends MSVideoPayload {
-    lowBitRateCallPercent?: number;
-    lowFrameRateCallPercent?: number;
-    recvBitRateAverage?: number;
-    recvBitRateMaximum?: number;
-    recvCodecType?: string;
-    recvFpsHarmonicAverage?: number;
-    recvFrameRateAverage?: number;
-    recvNumResSwitches?: number;
-    recvReorderBufferMaxSuccessfullyOrderedExtent?: number;
-    recvReorderBufferMaxSuccessfullyOrderedLateTime?: number;
-    recvReorderBufferPacketsDroppedDueToBufferExhaustion?: number;
-    recvReorderBufferPacketsDroppedDueToTimeout?: number;
-    recvReorderBufferReorderedPackets?: number;
-    recvResolutionHeight?: number;
-    recvResolutionWidth?: number;
-    recvVideoStreamsMax?: number;
-    recvVideoStreamsMin?: number;
-    recvVideoStreamsMode?: number;
-    reorderBufferTotalPackets?: number;
-    videoFrameLossRate?: number;
-    videoPostFECPLR?: number;
-    videoResolutions?: MSVideoResolutionDistribution;
-}
-
-interface MSVideoResolutionDistribution {
-    cifQuality?: number;
-    h1080Quality?: number;
-    h1440Quality?: number;
-    h2160Quality?: number;
-    h720Quality?: number;
-    vgaQuality?: number;
-}
-
-interface MSVideoSendPayload extends MSVideoPayload {
-    sendBitRateAverage?: number;
-    sendBitRateMaximum?: number;
-    sendFrameRateAverage?: number;
-    sendResolutionHeight?: number;
-    sendResolutionWidth?: number;
-    sendVideoStreamsMax?: number;
-}
-
-interface MediaElementAudioSourceOptions {
-    mediaElement: HTMLMediaElement;
-}
-
-interface MediaEncryptedEventInit extends EventInit {
-    initData?: ArrayBuffer | null;
-    initDataType?: string;
-}
-
-interface MediaKeyMessageEventInit extends EventInit {
-    message?: ArrayBuffer | null;
-    messageType?: MediaKeyMessageType;
-}
-
-interface MediaKeySystemConfiguration {
-    audioCapabilities?: MediaKeySystemMediaCapability[];
-    distinctiveIdentifier?: MediaKeysRequirement;
-    initDataTypes?: string[];
-    persistentState?: MediaKeysRequirement;
-    videoCapabilities?: MediaKeySystemMediaCapability[];
-}
-
-interface MediaKeySystemMediaCapability {
-    contentType?: string;
-    robustness?: string;
-}
-
-interface MediaStreamConstraints {
-    audio?: boolean | MediaTrackConstraints;
-    video?: boolean | MediaTrackConstraints;
-}
-
-interface MediaStreamErrorEventInit extends EventInit {
-    error?: MediaStreamError | null;
-}
-
-interface MediaStreamEventInit extends EventInit {
-    stream?: MediaStream;
-}
-
-interface MediaStreamTrackEventInit extends EventInit {
-    track?: MediaStreamTrack | null;
-}
-
-interface MediaTrackCapabilities {
-    aspectRatio?: number | DoubleRange;
-    deviceId?: string;
-    echoCancellation?: boolean[];
-    facingMode?: string;
-    frameRate?: number | DoubleRange;
-    groupId?: string;
-    height?: number | LongRange;
-    sampleRate?: number | LongRange;
-    sampleSize?: number | LongRange;
-    volume?: number | DoubleRange;
-    width?: number | LongRange;
-}
-
-interface MediaTrackConstraintSet {
-    aspectRatio?: number | ConstrainDoubleRange;
-    channelCount?: number | ConstrainLongRange;
-    deviceId?: string | string[] | ConstrainDOMStringParameters;
-    displaySurface?: string | string[] | ConstrainDOMStringParameters;
-    echoCancellation?: boolean | ConstrainBooleanParameters;
-    facingMode?: string | string[] | ConstrainDOMStringParameters;
-    frameRate?: number | ConstrainDoubleRange;
-    groupId?: string | string[] | ConstrainDOMStringParameters;
-    height?: number | ConstrainLongRange;
-    latency?: number | ConstrainDoubleRange;
-    logicalSurface?: boolean | ConstrainBooleanParameters;
-    sampleRate?: number | ConstrainLongRange;
-    sampleSize?: number | ConstrainLongRange;
-    volume?: number | ConstrainDoubleRange;
-    width?: number | ConstrainLongRange;
-}
-
-interface MediaTrackConstraints extends MediaTrackConstraintSet {
-    advanced?: MediaTrackConstraintSet[];
-}
-
-interface MediaTrackSettings {
-    aspectRatio?: number;
-    deviceId?: string;
-    echoCancellation?: boolean;
-    facingMode?: string;
-    frameRate?: number;
-    groupId?: string;
-    height?: number;
-    sampleRate?: number;
-    sampleSize?: number;
-    volume?: number;
-    width?: number;
-}
-
-interface MediaTrackSupportedConstraints {
-    aspectRatio?: boolean;
-    deviceId?: boolean;
-    echoCancellation?: boolean;
-    facingMode?: boolean;
-    frameRate?: boolean;
-    groupId?: boolean;
-    height?: boolean;
-    sampleRate?: boolean;
-    sampleSize?: boolean;
-    volume?: boolean;
-    width?: boolean;
-}
-
-interface MessageEventInit extends EventInit {
-    channel?: string;
-    data?: any;
-    lastEventId?: string;
-    origin?: string;
-    ports?: MessagePort[];
-    source?: Window | null;
-}
-
-interface MouseEventInit extends EventModifierInit {
-    button?: number;
-    buttons?: number;
-    clientX?: number;
-    clientY?: number;
-    relatedTarget?: EventTarget | null;
-    screenX?: number;
-    screenY?: number;
-}
-
-interface MsZoomToOptions {
-    animate?: string;
-    contentX?: number;
-    contentY?: number;
-    scaleFactor?: number;
-    viewportX?: string | null;
-    viewportY?: string | null;
-}
-
-interface MutationObserverInit {
-    attributeFilter?: string[];
-    attributeOldValue?: boolean;
-    attributes?: boolean;
-    characterData?: boolean;
-    characterDataOldValue?: boolean;
-    childList?: boolean;
-    subtree?: boolean;
-}
-
-interface NotificationEventInit extends ExtendableEventInit {
-    action?: string;
-    notification: Notification;
-}
-
-interface NotificationOptions {
-    body?: string;
-    data?: any;
-    dir?: NotificationDirection;
-    icon?: string;
-    lang?: string;
-    tag?: string;
-}
-
-interface ObjectURLOptions {
-    oneTimeOnly?: boolean;
-}
-
-interface OfflineAudioCompletionEventInit extends EventInit {
-    renderedBuffer: AudioBuffer;
-}
-
-interface OscillatorOptions extends AudioNodeOptions {
-    detune?: number;
-    frequency?: number;
-    periodicWave?: PeriodicWave;
-    type?: OscillatorType;
-}
-
-interface PannerOptions extends AudioNodeOptions {
-    coneInnerAngle?: number;
-    coneOuterAngle?: number;
-    coneOuterGain?: number;
-    distanceModel?: DistanceModelType;
-    maxDistance?: number;
-    orientationX?: number;
-    orientationY?: number;
-    orientationZ?: number;
-    panningModel?: PanningModelType;
-    positionX?: number;
-    positionY?: number;
-    positionZ?: number;
-    refDistance?: number;
-    rolloffFactor?: number;
-}
-
-interface PaymentCurrencyAmount {
-    currency: string;
-    currencySystem?: string;
-    value: string;
-}
-
-interface PaymentDetailsBase {
-    displayItems?: PaymentItem[];
-    modifiers?: PaymentDetailsModifier[];
-    shippingOptions?: PaymentShippingOption[];
-}
-
-interface PaymentDetailsInit extends PaymentDetailsBase {
-    id?: string;
-    total: PaymentItem;
-}
-
-interface PaymentDetailsModifier {
-    additionalDisplayItems?: PaymentItem[];
-    data?: any;
-    supportedMethods: string | string[];
-    total?: PaymentItem;
-}
-
-interface PaymentDetailsUpdate extends PaymentDetailsBase {
-    error?: string;
-    total?: PaymentItem;
-}
-
-interface PaymentItem {
-    amount: PaymentCurrencyAmount;
-    label: string;
-    pending?: boolean;
-}
-
-interface PaymentMethodData {
-    data?: any;
-    supportedMethods: string | string[];
-}
-
-interface PaymentOptions {
-    requestPayerEmail?: boolean;
-    requestPayerName?: boolean;
-    requestPayerPhone?: boolean;
-    requestShipping?: boolean;
-    shippingType?: string;
-}
-
-interface PaymentRequestUpdateEventInit extends EventInit {
-}
-
-interface PaymentShippingOption {
-    amount: PaymentCurrencyAmount;
-    id: string;
-    label: string;
-    selected?: boolean;
-}
-
-interface Pbkdf2Params extends Algorithm {
-    hash: string | Algorithm;
-    iterations: number;
-    salt: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-}
-
-interface PeriodicWaveConstraints {
-    disableNormalization?: boolean;
-}
-
-interface PeriodicWaveOptions extends PeriodicWaveConstraints {
-    imag?: number[];
-    real?: number[];
-}
-
-interface PointerEventInit extends MouseEventInit {
-    height?: number;
-    isPrimary?: boolean;
-    pointerId?: number;
-    pointerType?: string;
-    pressure?: number;
-    tiltX?: number;
-    tiltY?: number;
-    width?: number;
-}
-
-interface PopStateEventInit extends EventInit {
-    state?: any;
-}
-
-interface PositionOptions {
-    enableHighAccuracy?: boolean;
-    maximumAge?: number;
-    timeout?: number;
-}
-
-interface ProgressEventInit extends EventInit {
-    lengthComputable?: boolean;
-    loaded?: number;
-    total?: number;
-}
-
-interface PushEventInit extends ExtendableEventInit {
-    data?: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | string | null;
-}
-
-interface PushSubscriptionChangeInit extends ExtendableEventInit {
-    newSubscription?: PushSubscription;
-    oldSubscription?: PushSubscription;
-}
-
-interface PushSubscriptionOptionsInit {
-    applicationServerKey?: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | string | null;
-    userVisibleOnly?: boolean;
-}
-
-interface QueuingStrategy {
-    highWaterMark?: number;
-    size?: WritableStreamChunkCallback;
-}
-
-interface RTCConfiguration {
-    bundlePolicy?: RTCBundlePolicy;
-    iceServers?: RTCIceServer[];
-    iceTransportPolicy?: RTCIceTransportPolicy;
-    peerIdentity?: string;
-}
-
-interface RTCDTMFToneChangeEventInit extends EventInit {
-    tone?: string;
-}
-
-interface RTCDtlsFingerprint {
-    algorithm?: string;
-    value?: string;
-}
-
-interface RTCDtlsParameters {
-    fingerprints?: RTCDtlsFingerprint[];
-    role?: RTCDtlsRole;
-}
-
-interface RTCIceCandidateAttributes extends RTCStats {
-    addressSourceUrl?: string;
-    candidateType?: RTCStatsIceCandidateType;
-    ipAddress?: string;
-    portNumber?: number;
-    priority?: number;
-    transport?: string;
-}
-
-interface RTCIceCandidateComplete {
-}
-
-interface RTCIceCandidateDictionary {
-    foundation?: string;
-    ip?: string;
-    msMTurnSessionId?: string;
-    port?: number;
-    priority?: number;
-    protocol?: RTCIceProtocol;
-    relatedAddress?: string;
-    relatedPort?: number;
-    tcpType?: RTCIceTcpCandidateType;
-    type?: RTCIceCandidateType;
-}
-
-interface RTCIceCandidateInit {
-    candidate?: string;
-    sdpMLineIndex?: number;
-    sdpMid?: string;
-}
-
-interface RTCIceCandidatePair {
-    local?: RTCIceCandidateDictionary;
-    remote?: RTCIceCandidateDictionary;
-}
-
-interface RTCIceCandidatePairStats extends RTCStats {
-    availableIncomingBitrate?: number;
-    availableOutgoingBitrate?: number;
-    bytesReceived?: number;
-    bytesSent?: number;
-    localCandidateId?: string;
-    nominated?: boolean;
-    priority?: number;
-    readable?: boolean;
-    remoteCandidateId?: string;
-    roundTripTime?: number;
-    state?: RTCStatsIceCandidatePairState;
-    transportId?: string;
-    writable?: boolean;
-}
-
-interface RTCIceGatherOptions {
-    gatherPolicy?: RTCIceGatherPolicy;
-    iceservers?: RTCIceServer[];
-    portRange?: MSPortRange;
-}
-
-interface RTCIceParameters {
-    iceLite?: boolean | null;
-    password?: string;
-    usernameFragment?: string;
-}
-
-interface RTCIceServer {
-    credential?: string | null;
-    urls?: any;
-    username?: string | null;
-}
-
-interface RTCInboundRTPStreamStats extends RTCRTPStreamStats {
-    bytesReceived?: number;
-    fractionLost?: number;
-    jitter?: number;
-    packetsLost?: number;
-    packetsReceived?: number;
-}
-
-interface RTCMediaStreamTrackStats extends RTCStats {
-    audioLevel?: number;
-    echoReturnLoss?: number;
-    echoReturnLossEnhancement?: number;
-    frameHeight?: number;
-    frameWidth?: number;
-    framesCorrupted?: number;
-    framesDecoded?: number;
-    framesDropped?: number;
-    framesPerSecond?: number;
-    framesReceived?: number;
-    framesSent?: number;
-    remoteSource?: boolean;
-    ssrcIds?: string[];
-    trackIdentifier?: string;
-}
-
-interface RTCOfferOptions {
-    iceRestart?: boolean;
-    offerToReceiveAudio?: number;
-    offerToReceiveVideo?: number;
-    voiceActivityDetection?: boolean;
-}
-
-interface RTCOutboundRTPStreamStats extends RTCRTPStreamStats {
-    bytesSent?: number;
-    packetsSent?: number;
-    roundTripTime?: number;
-    targetBitrate?: number;
-}
-
-interface RTCPeerConnectionIceEventInit extends EventInit {
-    candidate?: RTCIceCandidate;
-}
-
-interface RTCRTPStreamStats extends RTCStats {
-    associateStatsId?: string;
-    codecId?: string;
-    firCount?: number;
-    isRemote?: boolean;
-    mediaTrackId?: string;
-    mediaType?: string;
-    nackCount?: number;
-    pliCount?: number;
-    sliCount?: number;
-    ssrc?: string;
-    transportId?: string;
-}
-
-interface RTCRtcpFeedback {
-    parameter?: string;
-    type?: string;
-}
-
-interface RTCRtcpParameters {
-    cname?: string;
-    mux?: boolean;
-    reducedSize?: boolean;
-    ssrc?: number;
-}
-
-interface RTCRtpCapabilities {
-    codecs?: RTCRtpCodecCapability[];
-    fecMechanisms?: string[];
-    headerExtensions?: RTCRtpHeaderExtension[];
-}
-
-interface RTCRtpCodecCapability {
-    clockRate?: number;
-    kind?: string;
-    maxSpatialLayers?: number;
-    maxTemporalLayers?: number;
-    maxptime?: number;
-    name?: string;
-    numChannels?: number;
-    options?: any;
-    parameters?: any;
-    preferredPayloadType?: number;
-    ptime?: number;
-    rtcpFeedback?: RTCRtcpFeedback[];
-    svcMultiStreamSupport?: boolean;
-}
-
-interface RTCRtpCodecParameters {
-    clockRate?: number;
-    maxptime?: number;
-    name?: string;
-    numChannels?: number;
-    parameters?: any;
-    payloadType?: number;
-    ptime?: number;
-    rtcpFeedback?: RTCRtcpFeedback[];
-}
-
-interface RTCRtpContributingSource {
-    audioLevel?: number;
-    csrc?: number;
-    timestamp?: number;
-}
-
-interface RTCRtpEncodingParameters {
-    active?: boolean;
-    codecPayloadType?: number;
-    dependencyEncodingIds?: string[];
-    encodingId?: string;
-    fec?: RTCRtpFecParameters;
-    framerateScale?: number;
-    maxBitrate?: number;
-    maxFramerate?: number;
-    minQuality?: number;
-    priority?: number;
-    resolutionScale?: number;
-    rtx?: RTCRtpRtxParameters;
-    ssrc?: number;
-    ssrcRange?: RTCSsrcRange;
-}
-
-interface RTCRtpFecParameters {
-    mechanism?: string;
-    ssrc?: number;
-}
-
-interface RTCRtpHeaderExtension {
-    kind?: string;
-    preferredEncrypt?: boolean;
-    preferredId?: number;
-    uri?: string;
-}
-
-interface RTCRtpHeaderExtensionParameters {
-    encrypt?: boolean;
-    id?: number;
-    uri?: string;
-}
-
-interface RTCRtpParameters {
-    codecs?: RTCRtpCodecParameters[];
-    degradationPreference?: RTCDegradationPreference;
-    encodings?: RTCRtpEncodingParameters[];
-    headerExtensions?: RTCRtpHeaderExtensionParameters[];
-    muxId?: string;
-    rtcp?: RTCRtcpParameters;
-}
-
-interface RTCRtpRtxParameters {
-    ssrc?: number;
-}
-
-interface RTCRtpUnhandled {
-    muxId?: string;
-    payloadType?: number;
-    ssrc?: number;
-}
-
-interface RTCSessionDescriptionInit {
-    sdp?: string;
-    type?: RTCSdpType;
-}
-
-interface RTCSrtpKeyParam {
-    keyMethod?: string;
-    keySalt?: string;
-    lifetime?: string;
-    mkiLength?: number;
-    mkiValue?: number;
-}
-
-interface RTCSrtpSdesParameters {
-    cryptoSuite?: string;
-    keyParams?: RTCSrtpKeyParam[];
-    sessionParams?: string[];
-    tag?: number;
-}
-
-interface RTCSsrcRange {
-    max?: number;
-    min?: number;
-}
-
-interface RTCStats {
-    id?: string;
-    msType?: MSStatsType;
-    timestamp?: number;
-    type?: RTCStatsType;
-}
-
-interface RTCStatsReport {
-}
-
-interface RTCTransportStats extends RTCStats {
-    activeConnection?: boolean;
-    bytesReceived?: number;
-    bytesSent?: number;
-    localCertificateId?: string;
-    remoteCertificateId?: string;
-    rtcpTransportStatsId?: string;
-    selectedCandidatePairId?: string;
-}
-
-interface RegistrationOptions {
-    scope?: string;
-}
-
-interface RequestInit {
-    body?: Blob | Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | FormData | string | null;
-    cache?: RequestCache;
-    credentials?: RequestCredentials;
-    headers?: HeadersInit;
-    integrity?: string;
-    keepalive?: boolean;
-    method?: string;
-    mode?: RequestMode;
-    redirect?: RequestRedirect;
-    referrer?: string;
-    referrerPolicy?: ReferrerPolicy;
-    signal?: AbortSignal;
-    window?: any;
-}
-
-interface ResponseInit {
-    headers?: HeadersInit;
-    status?: number;
-    statusText?: string;
-}
-
-interface RsaHashedImportParams extends Algorithm {
-    hash: string | Algorithm;
-}
-
-interface RsaHashedKeyAlgorithm extends RsaKeyAlgorithm {
-    hash: KeyAlgorithm;
-}
-
-interface RsaHashedKeyGenParams extends RsaKeyGenParams {
-    hash: string | Algorithm;
-}
-
-interface RsaKeyAlgorithm extends KeyAlgorithm {
-    modulusLength: number;
-    publicExponent: Uint8Array;
-}
-
-interface RsaKeyGenParams extends Algorithm {
-    modulusLength: number;
-    publicExponent: Uint8Array;
-}
-
-interface RsaOaepParams extends Algorithm {
-    label?: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-}
-
-interface RsaOtherPrimesInfo {
-    d?: string;
-    r?: string;
-    t?: string;
-}
-
-interface RsaPssParams extends Algorithm {
-    saltLength: number;
-}
-
-interface ScopedCredentialDescriptor {
-    id: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-    transports?: Transport[];
-    type: ScopedCredentialType;
-}
-
-interface ScopedCredentialOptions {
-    excludeList?: ScopedCredentialDescriptor[];
-    extensions?: WebAuthnExtensions;
-    rpId?: string;
-    timeoutSeconds?: number;
-}
-
-interface ScopedCredentialParameters {
-    algorithm: string | Algorithm;
-    type: ScopedCredentialType;
-}
-
-interface SecurityPolicyViolationEventInit extends EventInit {
-    blockedURI?: string;
-    columnNumber?: number;
-    documentURI?: string;
-    effectiveDirective?: string;
-    lineNumber?: number;
-    originalPolicy?: string;
-    referrer?: string;
-    sourceFile?: string;
-    statusCode?: number;
-    violatedDirective?: string;
-}
-
-interface ServiceWorkerMessageEventInit extends EventInit {
-    data?: any;
-    lastEventId?: string;
-    origin?: string;
-    ports?: MessagePort[] | null;
-    source?: ServiceWorker | MessagePort | null;
-}
-
-interface SpeechSynthesisEventInit extends EventInit {
-    charIndex?: number;
-    charLength?: number;
-    elapsedTime?: number;
-    name?: string;
-    utterance?: SpeechSynthesisUtterance | null;
-}
-
-interface StereoPannerOptions extends AudioNodeOptions {
-    pan?: number;
-}
-
-interface StoreExceptionsInformation extends ExceptionInformation {
-    detailURI?: string | null;
-    explanationString?: string | null;
-    siteName?: string | null;
-}
-
-interface StoreSiteSpecificExceptionsInformation extends StoreExceptionsInformation {
-    arrayOfDomainStrings?: string[];
-}
-
-interface SyncEventInit extends ExtendableEventInit {
-    lastChance?: boolean;
-    tag: string;
-}
-
-interface TextDecodeOptions {
-    stream?: boolean;
-}
-
-interface TextDecoderOptions {
-    fatal?: boolean;
-    ignoreBOM?: boolean;
-}
-
-interface TrackEventInit extends EventInit {
-    track?: VideoTrack | AudioTrack | TextTrack | null;
-}
-
-interface TransitionEventInit extends EventInit {
-    elapsedTime?: number;
-    propertyName?: string;
-}
-
-interface UIEventInit extends EventInit {
-    detail?: number;
-    view?: Window | null;
-}
-
-interface UnderlyingSink {
-    abort?: WritableStreamErrorCallback;
-    close?: WritableStreamDefaultControllerCallback;
-    start: WritableStreamDefaultControllerCallback;
-    write?: WritableStreamChunkCallback;
-}
-
-interface VRDisplayEventInit extends EventInit {
-    display: VRDisplay;
-    reason?: VRDisplayEventReason;
-}
-
-interface VRLayer {
-    leftBounds?: number[] | null;
-    rightBounds?: number[] | null;
-    source?: HTMLCanvasElement | null;
-}
-
-interface VRStageParameters {
-    sittingToStandingTransform?: Float32Array;
-    sizeX?: number;
-    sizeY?: number;
-}
-
-interface WaveShaperOptions extends AudioNodeOptions {
-    curve?: number[];
-    oversample?: OverSampleType;
-}
-
-interface WebAuthnExtensions {
-}
-
-interface WebGLContextAttributes {
-    alpha?: boolean;
-    antialias?: boolean;
-    depth?: boolean;
-    failIfMajorPerformanceCaveat?: boolean;
-    premultipliedAlpha?: boolean;
-    preserveDrawingBuffer?: boolean;
-    stencil?: boolean;
-}
-
-interface WebGLContextEventInit extends EventInit {
-    statusMessage?: string;
-}
-
-interface WheelEventInit extends MouseEventInit {
-    deltaMode?: number;
-    deltaX?: number;
-    deltaY?: number;
-    deltaZ?: number;
-}
-
-interface EventListener {
-    (evt: Event): void;
-}
-
-type WebKitEntriesCallback = ((entries: WebKitEntry[]) => void) | { handleEvent(entries: WebKitEntry[]): void; };
-
-type WebKitErrorCallback = ((err: DOMError) => void) | { handleEvent(err: DOMError): void; };
-
-type WebKitFileCallback = ((file: File) => void) | { handleEvent(file: File): void; };
-
-interface ANGLE_instanced_arrays {
-    drawArraysInstancedANGLE(mode: number, first: number, count: number, primcount: number): void;
-    drawElementsInstancedANGLE(mode: number, count: number, type: number, offset: number, primcount: number): void;
-    vertexAttribDivisorANGLE(index: number, divisor: number): void;
-    readonly VERTEX_ATTRIB_ARRAY_DIVISOR_ANGLE: number;
-}
-
-declare var ANGLE_instanced_arrays: {
-    prototype: ANGLE_instanced_arrays;
-    new(): ANGLE_instanced_arrays;
-    readonly VERTEX_ATTRIB_ARRAY_DIVISOR_ANGLE: number;
-};
-
-interface AbortController {
-    readonly signal: AbortSignal;
-    abort(): void;
-}
-
-declare var AbortController: {
-    prototype: AbortController;
-    new(): AbortController;
-};
-
-interface AbortSignalEventMap {
-    "abort": ProgressEvent;
-}
-
-interface AbortSignal extends EventTarget {
-    readonly aborted: boolean;
-    onabort: ((this: AbortSignal, ev: ProgressEvent) => any) | null;
-    addEventListener<K extends keyof AbortSignalEventMap>(type: K, listener: (this: AbortSignal, ev: AbortSignalEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof AbortSignalEventMap>(type: K, listener: (this: AbortSignal, ev: AbortSignalEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var AbortSignal: {
-    prototype: AbortSignal;
-    new(): AbortSignal;
-};
-
-interface AbstractWorkerEventMap {
-    "error": ErrorEvent;
-}
-
-interface AbstractWorker {
-    onerror: ((this: AbstractWorker, ev: ErrorEvent) => any) | null;
-    addEventListener<K extends keyof AbstractWorkerEventMap>(type: K, listener: (this: AbstractWorker, ev: AbstractWorkerEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof AbstractWorkerEventMap>(type: K, listener: (this: AbstractWorker, ev: AbstractWorkerEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-interface AesCfbParams extends Algorithm {
-    iv: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer;
-}
-
-interface AesCmacParams extends Algorithm {
-    length: number;
-}
-
-interface AnalyserNode extends AudioNode {
-    fftSize: number;
-    readonly frequencyBinCount: number;
-    maxDecibels: number;
-    minDecibels: number;
-    smoothingTimeConstant: number;
-    getByteFrequencyData(array: Uint8Array): void;
-    getByteTimeDomainData(array: Uint8Array): void;
-    getFloatFrequencyData(array: Float32Array): void;
-    getFloatTimeDomainData(array: Float32Array): void;
-}
-
-declare var AnalyserNode: {
-    prototype: AnalyserNode;
-    new(): AnalyserNode;
-};
-
-interface Animation {
-    currentTime: number | null;
-    effect: AnimationEffectReadOnly;
-    readonly finished: Promise<Animation>;
-    id: string;
-    readonly pending: boolean;
-    readonly playState: "idle" | "running" | "paused" | "finished";
-    playbackRate: number;
-    readonly ready: Promise<Animation>;
-    startTime: number;
-    timeline: AnimationTimeline;
-    cancel(): void;
-    finish(): void;
-    oncancel: (this: Animation, ev: AnimationPlaybackEvent) => any;
-    onfinish: (this: Animation, ev: AnimationPlaybackEvent) => any;
-    pause(): void;
-    play(): void;
-    reverse(): void;
-}
-
-declare var Animation: {
-    prototype: Animation;
-    new(effect?: AnimationEffectReadOnly, timeline?: AnimationTimeline): Animation;
-};
-
-interface AnimationEffectReadOnly {
-    readonly timing: number;
-    getComputedTiming(): ComputedTimingProperties;
-}
-
-interface AnimationEvent extends Event {
-    readonly animationName: string;
-    readonly elapsedTime: number;
-}
-
-declare var AnimationEvent: {
-    prototype: AnimationEvent;
-    new(typeArg: string, eventInitDict?: AnimationEventInit): AnimationEvent;
-};
-
-interface AnimationKeyFrame {
-    easing?: string | string[];
-    offset?: number | null | (number | null)[];
-    [index: string]: string | number | number[] | string[] | null | (number | null)[] | undefined;
-}
-
-interface AnimationOptions {
-    delay?: number;
-    direction?: "normal" | "reverse" | "alternate" | "alternate-reverse";
-    duration?: number;
-    easing?: string;
-    endDelay?: number;
-    fill?: "none" | "forwards" | "backwards" | "both"| "auto";
-    id?: string;
-    iterationStart?: number;
-    iterations?: number;
-}
-
-interface AnimationPlaybackEvent extends Event {
-    readonly currentTime: number | null;
-    readonly timelineTime: number | null;
-}
-
-declare var AnimationPlaybackEvent: {
-    prototype: AnimationPlaybackEvent;
-    new(type: string, eventInitDict?: AnimationPlaybackEventInit): AnimationPlaybackEvent;
-};
-
-interface AnimationPlaybackEventInit extends EventInit {
-    currentTime?: number | null;
-    timelineTime?: number | null;
-}
-
-interface AnimationTimeline {
-    readonly currentTime: number | null;
-}
-
-interface ApplicationCacheEventMap {
-    "cached": Event;
-    "checking": Event;
-    "downloading": Event;
-    "error": Event;
-    "noupdate": Event;
-    "obsolete": Event;
-    "progress": ProgressEvent;
-    "updateready": Event;
-}
-
-interface ApplicationCache extends EventTarget {
-    oncached: ((this: ApplicationCache, ev: Event) => any) | null;
-    onchecking: ((this: ApplicationCache, ev: Event) => any) | null;
-    ondownloading: ((this: ApplicationCache, ev: Event) => any) | null;
-    onerror: ((this: ApplicationCache, ev: Event) => any) | null;
-    onnoupdate: ((this: ApplicationCache, ev: Event) => any) | null;
-    onobsolete: ((this: ApplicationCache, ev: Event) => any) | null;
-    onprogress: ((this: ApplicationCache, ev: ProgressEvent) => any) | null;
-    onupdateready: ((this: ApplicationCache, ev: Event) => any) | null;
-    readonly status: number;
-    abort(): void;
-    swapCache(): void;
-    update(): void;
-    readonly CHECKING: number;
-    readonly DOWNLOADING: number;
-    readonly IDLE: number;
-    readonly OBSOLETE: number;
-    readonly UNCACHED: number;
-    readonly UPDATEREADY: number;
-    addEventListener<K extends keyof ApplicationCacheEventMap>(type: K, listener: (this: ApplicationCache, ev: ApplicationCacheEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof ApplicationCacheEventMap>(type: K, listener: (this: ApplicationCache, ev: ApplicationCacheEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var ApplicationCache: {
-    prototype: ApplicationCache;
-    new(): ApplicationCache;
-    readonly CHECKING: number;
-    readonly DOWNLOADING: number;
-    readonly IDLE: number;
-    readonly OBSOLETE: number;
-    readonly UNCACHED: number;
-    readonly UPDATEREADY: number;
-};
-
-interface AssignedNodesOptions {
-    flatten?: boolean;
-}
-
-interface Attr extends Node {
-    readonly name: string;
-    readonly ownerElement: Element | null;
-    readonly prefix: string | null;
-    readonly specified: boolean;
-    value: string;
-}
-
-declare var Attr: {
-    prototype: Attr;
-    new(): Attr;
-};
-
-interface AudioBuffer {
-    readonly duration: number;
-    readonly length: number;
-    readonly numberOfChannels: number;
-    readonly sampleRate: number;
-    copyFromChannel(destination: Float32Array, channelNumber: number, startInChannel?: number): void;
-    copyToChannel(source: Float32Array, channelNumber: number, startInChannel?: number): void;
-    getChannelData(channel: number): Float32Array;
-}
-
-declare var AudioBuffer: {
-    prototype: AudioBuffer;
-    new(): AudioBuffer;
-};
-
-interface AudioBufferSourceNodeEventMap {
-    "ended": Event;
-}
-
-interface AudioBufferSourceNode extends AudioNode {
-    buffer: AudioBuffer | null;
-    readonly detune: AudioParam;
-    loop: boolean;
-    loopEnd: number;
-    loopStart: number;
-    onended: ((this: AudioBufferSourceNode, ev: Event) => any) | null;
-    readonly playbackRate: AudioParam;
-    start(when?: number, offset?: number, duration?: number): void;
-    stop(when?: number): void;
-    addEventListener<K extends keyof AudioBufferSourceNodeEventMap>(type: K, listener: (this: AudioBufferSourceNode, ev: AudioBufferSourceNodeEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof AudioBufferSourceNodeEventMap>(type: K, listener: (this: AudioBufferSourceNode, ev: AudioBufferSourceNodeEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var AudioBufferSourceNode: {
-    prototype: AudioBufferSourceNode;
-    new(): AudioBufferSourceNode;
-};
-
-interface AudioContextEventMap {
-    "statechange": Event;
-}
-
-interface AudioContextBase extends EventTarget {
-    readonly currentTime: number;
-    readonly destination: AudioDestinationNode;
-    readonly listener: AudioListener;
-    onstatechange: ((this: AudioContext, ev: Event) => any) | null;
-    readonly sampleRate: number;
-    readonly state: AudioContextState;
-    close(): Promise<void>;
-    createAnalyser(): AnalyserNode;
-    createBiquadFilter(): BiquadFilterNode;
-    createBuffer(numberOfChannels: number, length: number, sampleRate: number): AudioBuffer;
-    createBufferSource(): AudioBufferSourceNode;
-    createChannelMerger(numberOfInputs?: number): ChannelMergerNode;
-    createChannelSplitter(numberOfOutputs?: number): ChannelSplitterNode;
-    createConvolver(): ConvolverNode;
-    createDelay(maxDelayTime?: number): DelayNode;
-    createDynamicsCompressor(): DynamicsCompressorNode;
-    createGain(): GainNode;
-    createIIRFilter(feedforward: number[], feedback: number[]): IIRFilterNode;
-    createMediaElementSource(mediaElement: HTMLMediaElement): MediaElementAudioSourceNode;
-    createMediaStreamSource(mediaStream: MediaStream): MediaStreamAudioSourceNode;
-    createOscillator(): OscillatorNode;
-    createPanner(): PannerNode;
-    createPeriodicWave(real: Float32Array, imag: Float32Array, constraints?: PeriodicWaveConstraints): PeriodicWave;
-    createScriptProcessor(bufferSize?: number, numberOfInputChannels?: number, numberOfOutputChannels?: number): ScriptProcessorNode;
-    createStereoPanner(): StereoPannerNode;
-    createWaveShaper(): WaveShaperNode;
-    decodeAudioData(audioData: ArrayBuffer, successCallback?: DecodeSuccessCallback, errorCallback?: DecodeErrorCallback): Promise<AudioBuffer>;
-    resume(): Promise<void>;
-    addEventListener<K extends keyof AudioContextEventMap>(type: K, listener: (this: AudioContext, ev: AudioContextEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof AudioContextEventMap>(type: K, listener: (this: AudioContext, ev: AudioContextEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-interface AudioContext extends AudioContextBase {
-    suspend(): Promise<void>;
-}
-
-declare var AudioContext: {
-    prototype: AudioContext;
-    new(): AudioContext;
-};
-
-interface AudioDestinationNode extends AudioNode {
-    readonly maxChannelCount: number;
-}
-
-declare var AudioDestinationNode: {
-    prototype: AudioDestinationNode;
-    new(): AudioDestinationNode;
-};
-
-interface AudioListener {
-    /** @deprecated */
-    dopplerFactor: number;
-    /** @deprecated */
-    speedOfSound: number;
-    /** @deprecated */
-    setOrientation(x: number, y: number, z: number, xUp: number, yUp: number, zUp: number): void;
-    /** @deprecated */
-    setPosition(x: number, y: number, z: number): void;
-    /** @deprecated */
-    setVelocity(x: number, y: number, z: number): void;
-}
-
-declare var AudioListener: {
-    prototype: AudioListener;
-    new(): AudioListener;
-};
-
-interface AudioNode extends EventTarget {
-    channelCount: number;
-    channelCountMode: ChannelCountMode;
-    channelInterpretation: ChannelInterpretation;
-    readonly context: AudioContext;
-    readonly numberOfInputs: number;
-    readonly numberOfOutputs: number;
-    connect(destination: AudioNode, output?: number, input?: number): AudioNode;
-    connect(destination: AudioParam, output?: number): void;
-    disconnect(): void;
-    disconnect(output: number): void;
-    disconnect(destination: AudioNode): void;
-    disconnect(destination: AudioNode, output: number): void;
-    disconnect(destination: AudioNode, output: number, input: number): void;
-    disconnect(destination: AudioParam): void;
-    disconnect(destination: AudioParam, output: number): void;
-}
-
-declare var AudioNode: {
-    prototype: AudioNode;
-    new(): AudioNode;
-};
-
-interface AudioParam {
-    readonly defaultValue: number;
-    value: number;
-    cancelScheduledValues(cancelTime: number): AudioParam;
-    exponentialRampToValueAtTime(value: number, endTime: number): AudioParam;
-    linearRampToValueAtTime(value: number, endTime: number): AudioParam;
-    setTargetAtTime(target: number, startTime: number, timeConstant: number): AudioParam;
-    setValueAtTime(value: number, startTime: number): AudioParam;
-    setValueCurveAtTime(values: number[], startTime: number, duration: number): AudioParam;
-}
-
-declare var AudioParam: {
-    prototype: AudioParam;
-    new(): AudioParam;
-};
-
-interface AudioProcessingEvent extends Event {
-    readonly inputBuffer: AudioBuffer;
-    readonly outputBuffer: AudioBuffer;
-    readonly playbackTime: number;
-}
-
-declare var AudioProcessingEvent: {
-    prototype: AudioProcessingEvent;
-    new(): AudioProcessingEvent;
-};
-
-interface AudioTrack {
-    enabled: boolean;
-    readonly id: string;
-    kind: string;
-    readonly label: string;
-    language: string;
-    readonly sourceBuffer: SourceBuffer;
-}
-
-declare var AudioTrack: {
-    prototype: AudioTrack;
-    new(): AudioTrack;
-};
-
-interface AudioTrackListEventMap {
-    "addtrack": TrackEvent;
-    "change": Event;
-    "removetrack": TrackEvent;
-}
-
-interface AudioTrackList extends EventTarget {
-    readonly length: number;
-    onaddtrack: ((this: AudioTrackList, ev: TrackEvent) => any) | null;
-    onchange: ((this: AudioTrackList, ev: Event) => any) | null;
-    onremovetrack: ((this: AudioTrackList, ev: TrackEvent) => any) | null;
-    getTrackById(id: string): AudioTrack | null;
-    item(index: number): AudioTrack;
-    addEventListener<K extends keyof AudioTrackListEventMap>(type: K, listener: (this: AudioTrackList, ev: AudioTrackListEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof AudioTrackListEventMap>(type: K, listener: (this: AudioTrackList, ev: AudioTrackListEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-    [index: number]: AudioTrack;
-}
-
-declare var AudioTrackList: {
-    prototype: AudioTrackList;
-    new(): AudioTrackList;
-};
-
-interface BarProp {
-    readonly visible: boolean;
-}
-
-declare var BarProp: {
-    prototype: BarProp;
-    new(): BarProp;
-};
-
-interface BeforeUnloadEvent extends Event {
-    returnValue: any;
-}
-
-declare var BeforeUnloadEvent: {
-    prototype: BeforeUnloadEvent;
-    new(): BeforeUnloadEvent;
-};
-
-interface BhxBrowser {
-    readonly lastError: DOMException;
-    checkMatchesGlobExpression(pattern: string, value: string): boolean;
-    checkMatchesUriExpression(pattern: string, value: string): boolean;
-    clearLastError(): void;
-    currentWindowId(): number;
-    fireExtensionApiTelemetry(functionName: string, isSucceeded: boolean, isSupported: boolean, errorString: string): void;
-    genericFunction(functionId: number, destination: any, parameters?: string, callbackId?: number): void;
-    genericSynchronousFunction(functionId: number, parameters?: string): string;
-    getExtensionId(): string;
-    getThisAddress(): any;
-    registerGenericFunctionCallbackHandler(callbackHandler: Function): void;
-    registerGenericListenerHandler(eventHandler: Function): void;
-    setLastError(parameters: string): void;
-    webPlatformGenericFunction(destination: any, parameters?: string, callbackId?: number): void;
-}
-
-declare var BhxBrowser: {
-    prototype: BhxBrowser;
-    new(): BhxBrowser;
-};
-
-interface BiquadFilterNode extends AudioNode {
-    readonly Q: AudioParam;
-    readonly detune: AudioParam;
-    readonly frequency: AudioParam;
-    readonly gain: AudioParam;
-    type: BiquadFilterType;
-    getFrequencyResponse(frequencyHz: Float32Array, magResponse: Float32Array, phaseResponse: Float32Array): void;
-}
-
-declare var BiquadFilterNode: {
-    prototype: BiquadFilterNode;
-    new(): BiquadFilterNode;
-};
-
-interface Blob {
-    readonly size: number;
-    readonly type: string;
-    msClose(): void;
-    msDetachStream(): any;
-    slice(start?: number, end?: number, contentType?: string): Blob;
-}
-
-declare var Blob: {
-    prototype: Blob;
-    new (blobParts?: any[], options?: BlobPropertyBag): Blob;
-};
-
-interface BlobPropertyBag {
-    endings?: string;
-    type?: string;
-}
-
-interface Body {
-    readonly bodyUsed: boolean;
-    arrayBuffer(): Promise<ArrayBuffer>;
-    blob(): Promise<Blob>;
-    formData(): Promise<FormData>;
-    json(): Promise<any>;
-    text(): Promise<string>;
-}
-
-interface BroadcastChannel extends EventTarget {
-    readonly name: string;
-    onmessage: (ev: MessageEvent) => any;
-    onmessageerror: (ev: MessageEvent) => any;
-    addEventListener<K extends keyof BroadcastChannelEventMap>(type: K, listener: (this: BroadcastChannel, ev: BroadcastChannelEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    close(): void;
-    postMessage(message: any): void;
-    removeEventListener<K extends keyof BroadcastChannelEventMap>(type: K, listener: (this: BroadcastChannel, ev: BroadcastChannelEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var BroadcastChannel: {
-    prototype: BroadcastChannel;
-    new(name: string): BroadcastChannel;
-};
-
-interface BroadcastChannelEventMap {
-    message: MessageEvent;
-    messageerror: MessageEvent;
-}
-
-interface ByteLengthQueuingStrategy {
-    highWaterMark: number;
-    size(chunk?: any): number;
-}
-
-declare var ByteLengthQueuingStrategy: {
-    prototype: ByteLengthQueuingStrategy;
-    new(strategy: QueuingStrategy): ByteLengthQueuingStrategy;
-};
-
-interface CDATASection extends Text {
-}
-
-declare var CDATASection: {
-    prototype: CDATASection;
-    new(): CDATASection;
-};
-
-interface CSS {
-    escape(value: string): string;
-    supports(property: string, value?: string): boolean;
-}
-declare var CSS: CSS;
-
-interface CSSConditionRule extends CSSGroupingRule {
-    conditionText: string;
-}
-
-declare var CSSConditionRule: {
-    prototype: CSSConditionRule;
-    new(): CSSConditionRule;
-};
-
-interface CSSFontFaceRule extends CSSRule {
-    readonly style: CSSStyleDeclaration;
-}
-
-declare var CSSFontFaceRule: {
-    prototype: CSSFontFaceRule;
-    new(): CSSFontFaceRule;
-};
-
-interface CSSGroupingRule extends CSSRule {
-    readonly cssRules: CSSRuleList;
-    deleteRule(index: number): void;
-    insertRule(rule: string, index: number): number;
-}
-
-declare var CSSGroupingRule: {
-    prototype: CSSGroupingRule;
-    new(): CSSGroupingRule;
-};
-
-interface CSSImportRule extends CSSRule {
-    readonly href: string;
-    readonly media: MediaList;
-    readonly styleSheet: CSSStyleSheet;
-}
-
-declare var CSSImportRule: {
-    prototype: CSSImportRule;
-    new(): CSSImportRule;
-};
-
-interface CSSKeyframeRule extends CSSRule {
-    keyText: string;
-    readonly style: CSSStyleDeclaration;
-}
-
-declare var CSSKeyframeRule: {
-    prototype: CSSKeyframeRule;
-    new(): CSSKeyframeRule;
-};
-
-interface CSSKeyframesRule extends CSSRule {
-    readonly cssRules: CSSRuleList;
-    name: string;
-    appendRule(rule: string): void;
-    deleteRule(rule: string): void;
-    findRule(rule: string): CSSKeyframeRule | null;
-}
-
-declare var CSSKeyframesRule: {
-    prototype: CSSKeyframesRule;
-    new(): CSSKeyframesRule;
-};
-
-interface CSSMediaRule extends CSSConditionRule {
-    readonly media: MediaList;
-}
-
-declare var CSSMediaRule: {
-    prototype: CSSMediaRule;
-    new(): CSSMediaRule;
-};
-
-interface CSSNamespaceRule extends CSSRule {
-    readonly namespaceURI: string;
-    readonly prefix: string;
-}
-
-declare var CSSNamespaceRule: {
-    prototype: CSSNamespaceRule;
-    new(): CSSNamespaceRule;
-};
-
-interface CSSPageRule extends CSSRule {
-    readonly pseudoClass: string;
-    readonly selector: string;
-    selectorText: string;
-    readonly style: CSSStyleDeclaration;
-}
-
-declare var CSSPageRule: {
-    prototype: CSSPageRule;
-    new(): CSSPageRule;
-};
-
-interface CSSRule {
-    cssText: string;
-    readonly parentRule: CSSRule | null;
-    readonly parentStyleSheet: CSSStyleSheet | null;
-    readonly type: number;
-    readonly CHARSET_RULE: number;
-    readonly FONT_FACE_RULE: number;
-    readonly IMPORT_RULE: number;
-    readonly KEYFRAMES_RULE: number;
-    readonly KEYFRAME_RULE: number;
-    readonly MEDIA_RULE: number;
-    readonly NAMESPACE_RULE: number;
-    readonly PAGE_RULE: number;
-    readonly STYLE_RULE: number;
-    readonly SUPPORTS_RULE: number;
-    readonly UNKNOWN_RULE: number;
-    readonly VIEWPORT_RULE: number;
-}
-
-declare var CSSRule: {
-    prototype: CSSRule;
-    new(): CSSRule;
-    readonly CHARSET_RULE: number;
-    readonly FONT_FACE_RULE: number;
-    readonly IMPORT_RULE: number;
-    readonly KEYFRAMES_RULE: number;
-    readonly KEYFRAME_RULE: number;
-    readonly MEDIA_RULE: number;
-    readonly NAMESPACE_RULE: number;
-    readonly PAGE_RULE: number;
-    readonly STYLE_RULE: number;
-    readonly SUPPORTS_RULE: number;
-    readonly UNKNOWN_RULE: number;
-    readonly VIEWPORT_RULE: number;
-};
-
-interface CSSRuleList {
-    readonly length: number;
-    item(index: number): CSSRule | null;
-    [index: number]: CSSRule;
-}
-
-declare var CSSRuleList: {
-    prototype: CSSRuleList;
-    new(): CSSRuleList;
-};
-
-interface CSSStyleDeclaration {
-    alignContent: string | null;
-    alignItems: string | null;
-    alignSelf: string | null;
-    alignmentBaseline: string | null;
-    animation: string | null;
-    animationDelay: string | null;
-    animationDirection: string | null;
-    animationDuration: string | null;
-    animationFillMode: string | null;
-    animationIterationCount: string | null;
-    animationName: string | null;
-    animationPlayState: string | null;
-    animationTimingFunction: string | null;
-    backfaceVisibility: string | null;
-    background: string | null;
-    backgroundAttachment: string | null;
-    backgroundClip: string | null;
-    backgroundColor: string | null;
-    backgroundImage: string | null;
-    backgroundOrigin: string | null;
-    backgroundPosition: string | null;
-    backgroundPositionX: string | null;
-    backgroundPositionY: string | null;
-    backgroundRepeat: string | null;
-    backgroundSize: string | null;
-    baselineShift: string | null;
-    border: string | null;
-    borderBottom: string | null;
-    borderBottomColor: string | null;
-    borderBottomLeftRadius: string | null;
-    borderBottomRightRadius: string | null;
-    borderBottomStyle: string | null;
-    borderBottomWidth: string | null;
-    borderCollapse: string | null;
-    borderColor: string | null;
-    borderImage: string | null;
-    borderImageOutset: string | null;
-    borderImageRepeat: string | null;
-    borderImageSlice: string | null;
-    borderImageSource: string | null;
-    borderImageWidth: string | null;
-    borderLeft: string | null;
-    borderLeftColor: string | null;
-    borderLeftStyle: string | null;
-    borderLeftWidth: string | null;
-    borderRadius: string | null;
-    borderRight: string | null;
-    borderRightColor: string | null;
-    borderRightStyle: string | null;
-    borderRightWidth: string | null;
-    borderSpacing: string | null;
-    borderStyle: string | null;
-    borderTop: string | null;
-    borderTopColor: string | null;
-    borderTopLeftRadius: string | null;
-    borderTopRightRadius: string | null;
-    borderTopStyle: string | null;
-    borderTopWidth: string | null;
-    borderWidth: string | null;
-    bottom: string | null;
-    boxShadow: string | null;
-    boxSizing: string | null;
-    breakAfter: string | null;
-    breakBefore: string | null;
-    breakInside: string | null;
-    captionSide: string | null;
-    clear: string | null;
-    clip: string | null;
-    clipPath: string | null;
-    clipRule: string | null;
-    color: string | null;
-    colorInterpolationFilters: string | null;
-    columnCount: any;
-    columnFill: string | null;
-    columnGap: any;
-    columnRule: string | null;
-    columnRuleColor: any;
-    columnRuleStyle: string | null;
-    columnRuleWidth: any;
-    columnSpan: string | null;
-    columnWidth: any;
-    columns: string | null;
-    content: string | null;
-    counterIncrement: string | null;
-    counterReset: string | null;
-    cssFloat: string | null;
-    cssText: string;
-    cursor: string | null;
-    direction: string | null;
-    display: string | null;
-    dominantBaseline: string | null;
-    emptyCells: string | null;
-    enableBackground: string | null;
-    fill: string | null;
-    fillOpacity: string | null;
-    fillRule: string | null;
-    filter: string | null;
-    flex: string | null;
-    flexBasis: string | null;
-    flexDirection: string | null;
-    flexFlow: string | null;
-    flexGrow: string | null;
-    flexShrink: string | null;
-    flexWrap: string | null;
-    floodColor: string | null;
-    floodOpacity: string | null;
-    font: string | null;
-    fontFamily: string | null;
-    fontFeatureSettings: string | null;
-    fontSize: string | null;
-    fontSizeAdjust: string | null;
-    fontStretch: string | null;
-    fontStyle: string | null;
-    fontVariant: string | null;
-    fontWeight: string | null;
-    gap: string | null;
-    glyphOrientationHorizontal: string | null;
-    glyphOrientationVertical: string | null;
-    grid: string | null;
-    gridArea: string | null;
-    gridAutoColumns: string | null;
-    gridAutoFlow: string | null;
-    gridAutoRows: string | null;
-    gridColumn: string | null;
-    gridColumnEnd: string | null;
-    gridColumnGap: string | null;
-    gridColumnStart: string | null;
-    gridGap: string | null;
-    gridRow: string | null;
-    gridRowEnd: string | null;
-    gridRowGap: string | null;
-    gridRowStart: string | null;
-    gridTemplate: string | null;
-    gridTemplateAreas: string | null;
-    gridTemplateColumns: string | null;
-    gridTemplateRows: string | null;
-    height: string | null;
-    imeMode: string | null;
-    justifyContent: string | null;
-    justifyItems: string | null;
-    justifySelf: string | null;
-    kerning: string | null;
-    layoutGrid: string | null;
-    layoutGridChar: string | null;
-    layoutGridLine: string | null;
-    layoutGridMode: string | null;
-    layoutGridType: string | null;
-    left: string | null;
-    readonly length: number;
-    letterSpacing: string | null;
-    lightingColor: string | null;
-    lineBreak: string | null;
-    lineHeight: string | null;
-    listStyle: string | null;
-    listStyleImage: string | null;
-    listStylePosition: string | null;
-    listStyleType: string | null;
-    margin: string | null;
-    marginBottom: string | null;
-    marginLeft: string | null;
-    marginRight: string | null;
-    marginTop: string | null;
-    marker: string | null;
-    markerEnd: string | null;
-    markerMid: string | null;
-    markerStart: string | null;
-    mask: string | null;
-    maskImage: string | null;
-    maxHeight: string | null;
-    maxWidth: string | null;
-    minHeight: string | null;
-    minWidth: string | null;
-    msContentZoomChaining: string | null;
-    msContentZoomLimit: string | null;
-    msContentZoomLimitMax: any;
-    msContentZoomLimitMin: any;
-    msContentZoomSnap: string | null;
-    msContentZoomSnapPoints: string | null;
-    msContentZoomSnapType: string | null;
-    msContentZooming: string | null;
-    msFlowFrom: string | null;
-    msFlowInto: string | null;
-    msFontFeatureSettings: string | null;
-    msGridColumn: any;
-    msGridColumnAlign: string | null;
-    msGridColumnSpan: any;
-    msGridColumns: string | null;
-    msGridRow: any;
-    msGridRowAlign: string | null;
-    msGridRowSpan: any;
-    msGridRows: string | null;
-    msHighContrastAdjust: string | null;
-    msHyphenateLimitChars: string | null;
-    msHyphenateLimitLines: any;
-    msHyphenateLimitZone: any;
-    msHyphens: string | null;
-    msImeAlign: string | null;
-    msOverflowStyle: string | null;
-    msScrollChaining: string | null;
-    msScrollLimit: string | null;
-    msScrollLimitXMax: any;
-    msScrollLimitXMin: any;
-    msScrollLimitYMax: any;
-    msScrollLimitYMin: any;
-    msScrollRails: string | null;
-    msScrollSnapPointsX: string | null;
-    msScrollSnapPointsY: string | null;
-    msScrollSnapType: string | null;
-    msScrollSnapX: string | null;
-    msScrollSnapY: string | null;
-    msScrollTranslation: string | null;
-    msTextCombineHorizontal: string | null;
-    msTextSizeAdjust: any;
-    msTouchAction: string | null;
-    msTouchSelect: string | null;
-    msUserSelect: string | null;
-    msWrapFlow: string;
-    msWrapMargin: any;
-    msWrapThrough: string;
-    objectFit: string | null;
-    objectPosition: string | null;
-    opacity: string | null;
-    order: string | null;
-    orphans: string | null;
-    outline: string | null;
-    outlineColor: string | null;
-    outlineOffset: string | null;
-    outlineStyle: string | null;
-    outlineWidth: string | null;
-    overflow: string | null;
-    overflowX: string | null;
-    overflowY: string | null;
-    padding: string | null;
-    paddingBottom: string | null;
-    paddingLeft: string | null;
-    paddingRight: string | null;
-    paddingTop: string | null;
-    pageBreakAfter: string | null;
-    pageBreakBefore: string | null;
-    pageBreakInside: string | null;
-    readonly parentRule: CSSRule;
-    penAction: string | null;
-    perspective: string | null;
-    perspectiveOrigin: string | null;
-    pointerEvents: string | null;
-    position: string | null;
-    quotes: string | null;
-    resize: string | null;
-    right: string | null;
-    rotate: string | null;
-    rowGap: string | null;
-    rubyAlign: string | null;
-    rubyOverhang: string | null;
-    rubyPosition: string | null;
-    scale: string | null;
-    stopColor: string | null;
-    stopOpacity: string | null;
-    stroke: string | null;
-    strokeDasharray: string | null;
-    strokeDashoffset: string | null;
-    strokeLinecap: string | null;
-    strokeLinejoin: string | null;
-    strokeMiterlimit: string | null;
-    strokeOpacity: string | null;
-    strokeWidth: string | null;
-    tableLayout: string | null;
-    textAlign: string | null;
-    textAlignLast: string | null;
-    textAnchor: string | null;
-    textCombineUpright: string | null;
-    textDecoration: string | null;
-    textIndent: string | null;
-    textJustify: string | null;
-    textKashida: string | null;
-    textKashidaSpace: string | null;
-    textOverflow: string | null;
-    textShadow: string | null;
-    textTransform: string | null;
-    textUnderlinePosition: string | null;
-    top: string | null;
-    touchAction: string | null;
-    transform: string | null;
-    transformOrigin: string | null;
-    transformStyle: string | null;
-    transition: string | null;
-    transitionDelay: string | null;
-    transitionDuration: string | null;
-    transitionProperty: string | null;
-    transitionTimingFunction: string | null;
-    translate: string | null;
-    unicodeBidi: string | null;
-    userSelect: string | null;
-    verticalAlign: string | null;
-    visibility: string | null;
-    webkitAlignContent: string | null;
-    webkitAlignItems: string | null;
-    webkitAlignSelf: string | null;
-    webkitAnimation: string | null;
-    webkitAnimationDelay: string | null;
-    webkitAnimationDirection: string | null;
-    webkitAnimationDuration: string | null;
-    webkitAnimationFillMode: string | null;
-    webkitAnimationIterationCount: string | null;
-    webkitAnimationName: string | null;
-    webkitAnimationPlayState: string | null;
-    webkitAnimationTimingFunction: string | null;
-    webkitAppearance: string | null;
-    webkitBackfaceVisibility: string | null;
-    webkitBackgroundClip: string | null;
-    webkitBackgroundOrigin: string | null;
-    webkitBackgroundSize: string | null;
-    webkitBorderBottomLeftRadius: string | null;
-    webkitBorderBottomRightRadius: string | null;
-    webkitBorderImage: string | null;
-    webkitBorderRadius: string | null;
-    webkitBorderTopLeftRadius: string | null;
-    webkitBorderTopRightRadius: string | null;
-    webkitBoxAlign: string | null;
-    webkitBoxDirection: string | null;
-    webkitBoxFlex: string | null;
-    webkitBoxOrdinalGroup: string | null;
-    webkitBoxOrient: string | null;
-    webkitBoxPack: string | null;
-    webkitBoxSizing: string | null;
-    webkitColumnBreakAfter: string | null;
-    webkitColumnBreakBefore: string | null;
-    webkitColumnBreakInside: string | null;
-    webkitColumnCount: any;
-    webkitColumnGap: any;
-    webkitColumnRule: string | null;
-    webkitColumnRuleColor: any;
-    webkitColumnRuleStyle: string | null;
-    webkitColumnRuleWidth: any;
-    webkitColumnSpan: string | null;
-    webkitColumnWidth: any;
-    webkitColumns: string | null;
-    webkitFilter: string | null;
-    webkitFlex: string | null;
-    webkitFlexBasis: string | null;
-    webkitFlexDirection: string | null;
-    webkitFlexFlow: string | null;
-    webkitFlexGrow: string | null;
-    webkitFlexShrink: string | null;
-    webkitFlexWrap: string | null;
-    webkitJustifyContent: string | null;
-    webkitOrder: string | null;
-    webkitPerspective: string | null;
-    webkitPerspectiveOrigin: string | null;
-    webkitTapHighlightColor: string | null;
-    webkitTextFillColor: string | null;
-    webkitTextSizeAdjust: any;
-    webkitTextStroke: string | null;
-    webkitTextStrokeColor: string | null;
-    webkitTextStrokeWidth: string | null;
-    webkitTransform: string | null;
-    webkitTransformOrigin: string | null;
-    webkitTransformStyle: string | null;
-    webkitTransition: string | null;
-    webkitTransitionDelay: string | null;
-    webkitTransitionDuration: string | null;
-    webkitTransitionProperty: string | null;
-    webkitTransitionTimingFunction: string | null;
-    webkitUserModify: string | null;
-    webkitUserSelect: string | null;
-    webkitWritingMode: string | null;
-    whiteSpace: string | null;
-    widows: string | null;
-    width: string | null;
-    wordBreak: string | null;
-    wordSpacing: string | null;
-    wordWrap: string | null;
-    writingMode: string | null;
-    zIndex: string | null;
-    zoom: string | null;
-    getPropertyPriority(propertyName: string): string;
-    getPropertyValue(propertyName: string): string;
-    item(index: number): string;
-    removeProperty(propertyName: string): string;
-    setProperty(propertyName: string, value: string | null, priority?: string | null): void;
-    [index: number]: string;
-}
-
-declare var CSSStyleDeclaration: {
-    prototype: CSSStyleDeclaration;
-    new(): CSSStyleDeclaration;
-};
-
-interface CSSStyleRule extends CSSRule {
-    selectorText: string;
-    readonly style: CSSStyleDeclaration;
-}
-
-declare var CSSStyleRule: {
-    prototype: CSSStyleRule;
-    new(): CSSStyleRule;
-};
-
-interface CSSStyleSheet extends StyleSheet {
-    readonly cssRules: CSSRuleList;
-    /** @deprecated */
-    cssText: string;
-    /** @deprecated */
-    readonly id: string;
-    /** @deprecated */
-    readonly imports: StyleSheetList;
-    /** @deprecated */
-    readonly isAlternate: boolean;
-    /** @deprecated */
-    readonly isPrefAlternate: boolean;
-    readonly ownerRule: CSSRule | null;
-    /** @deprecated */
-    readonly owningElement: Element;
-    /** @deprecated */
-    readonly pages: any;
-    /** @deprecated */
-    readonly readOnly: boolean;
-    readonly rules: CSSRuleList;
-    /** @deprecated */
-    addImport(bstrURL: string, lIndex?: number): number;
-    /** @deprecated */
-    addPageRule(bstrSelector: string, bstrStyle: string, lIndex?: number): number;
-    addRule(bstrSelector: string, bstrStyle?: string, lIndex?: number): number;
-    deleteRule(index?: number): void;
-    insertRule(rule: string, index?: number): number;
-    /** @deprecated */
-    removeImport(lIndex: number): void;
-    removeRule(lIndex: number): void;
-}
-
-declare var CSSStyleSheet: {
-    prototype: CSSStyleSheet;
-    new(): CSSStyleSheet;
-};
-
-interface CSSSupportsRule extends CSSConditionRule {
-}
-
-declare var CSSSupportsRule: {
-    prototype: CSSSupportsRule;
-    new(): CSSSupportsRule;
-};
-
-interface Cache {
-    add(request: Request | string): Promise<void>;
-    addAll(requests: (Request | string)[]): Promise<void>;
-    delete(request: Request | string, options?: CacheQueryOptions): Promise<boolean>;
-    keys(request?: Request | string, options?: CacheQueryOptions): Promise<Request[]>;
-    match(request: Request | string, options?: CacheQueryOptions): Promise<Response>;
-    matchAll(request?: Request | string, options?: CacheQueryOptions): Promise<Response[]>;
-    put(request: Request | string, response: Response): Promise<void>;
-}
-
-declare var Cache: {
-    prototype: Cache;
-    new(): Cache;
-};
-
-interface CacheStorage {
-    delete(cacheName: string): Promise<boolean>;
-    has(cacheName: string): Promise<boolean>;
-    keys(): Promise<string[]>;
-    match(request: Request | string, options?: CacheQueryOptions): Promise<any>;
-    open(cacheName: string): Promise<Cache>;
-}
-
-declare var CacheStorage: {
-    prototype: CacheStorage;
-    new(): CacheStorage;
-};
-
-interface Canvas2DContextAttributes {
-    alpha?: boolean;
-    storage?: boolean;
-    willReadFrequently?: boolean;
-    [attribute: string]: boolean | string | undefined;
-}
-
-interface CanvasGradient {
-    addColorStop(offset: number, color: string): void;
-}
-
-declare var CanvasGradient: {
-    prototype: CanvasGradient;
-    new(): CanvasGradient;
-};
-
-interface CanvasPathMethods {
-    arc(x: number, y: number, radius: number, startAngle: number, endAngle: number, anticlockwise?: boolean): void;
-    arcTo(x1: number, y1: number, x2: number, y2: number, radius: number): void;
-    arcTo(x1: number, y1: number, x2: number, y2: number, radiusX: number, radiusY: number, rotation: number): void;
-    bezierCurveTo(cp1x: number, cp1y: number, cp2x: number, cp2y: number, x: number, y: number): void;
-    closePath(): void;
-    ellipse(x: number, y: number, radiusX: number, radiusY: number, rotation: number, startAngle: number, endAngle: number, anticlockwise?: boolean): void;
-    lineTo(x: number, y: number): void;
-    moveTo(x: number, y: number): void;
-    quadraticCurveTo(cpx: number, cpy: number, x: number, y: number): void;
-    rect(x: number, y: number, w: number, h: number): void;
-}
-
-interface CanvasPattern {
-    setTransform(matrix: SVGMatrix): void;
-}
-
-declare var CanvasPattern: {
-    prototype: CanvasPattern;
-    new(): CanvasPattern;
-};
-
-interface CanvasRenderingContext2D extends CanvasPathMethods {
-    readonly canvas: HTMLCanvasElement;
-    fillStyle: string | CanvasGradient | CanvasPattern;
-    font: string;
-    globalAlpha: number;
-    globalCompositeOperation: string;
-    imageSmoothingEnabled: boolean;
-    lineCap: string;
-    lineDashOffset: number;
-    lineJoin: string;
-    lineWidth: number;
-    miterLimit: number;
-    mozImageSmoothingEnabled: boolean;
-    msFillRule: CanvasFillRule;
-    oImageSmoothingEnabled: boolean;
-    shadowBlur: number;
-    shadowColor: string;
-    shadowOffsetX: number;
-    shadowOffsetY: number;
-    strokeStyle: string | CanvasGradient | CanvasPattern;
-    textAlign: string;
-    textBaseline: string;
-    webkitImageSmoothingEnabled: boolean;
-    beginPath(): void;
-    clearRect(x: number, y: number, w: number, h: number): void;
-    clip(fillRule?: CanvasFillRule): void;
-    clip(path: Path2D, fillRule?: CanvasFillRule): void;
-    createImageData(imageDataOrSw: number | ImageData, sh?: number): ImageData;
-    createLinearGradient(x0: number, y0: number, x1: number, y1: number): CanvasGradient;
-    createPattern(image: HTMLImageElement | HTMLCanvasElement | HTMLVideoElement, repetition: string): CanvasPattern;
-    createRadialGradient(x0: number, y0: number, r0: number, x1: number, y1: number, r1: number): CanvasGradient;
-    drawFocusIfNeeded(element: Element): void;
-    drawFocusIfNeeded(path: Path2D, element: Element): void;
-    drawImage(image: HTMLImageElement | HTMLCanvasElement | HTMLVideoElement | ImageBitmap, dstX: number, dstY: number): void;
-    drawImage(image: HTMLImageElement | HTMLCanvasElement | HTMLVideoElement | ImageBitmap, dstX: number, dstY: number, dstW: number, dstH: number): void;
-    drawImage(image: HTMLImageElement | HTMLCanvasElement | HTMLVideoElement | ImageBitmap, srcX: number, srcY: number, srcW: number, srcH: number, dstX: number, dstY: number, dstW: number, dstH: number): void;
-    fill(fillRule?: CanvasFillRule): void;
-    fill(path: Path2D, fillRule?: CanvasFillRule): void;
-    fillRect(x: number, y: number, w: number, h: number): void;
-    fillText(text: string, x: number, y: number, maxWidth?: number): void;
-    getImageData(sx: number, sy: number, sw: number, sh: number): ImageData;
-    getLineDash(): number[];
-    isPointInPath(x: number, y: number, fillRule?: CanvasFillRule): boolean;
-    isPointInPath(path: Path2D, x: number, y: number, fillRule?: CanvasFillRule): boolean;
-    isPointInStroke(x: number, y: number, fillRule?: CanvasFillRule): boolean;
-    isPointInStroke(path: Path2D, x: number, y: number, fillRule?: CanvasFillRule): boolean;
-    measureText(text: string): TextMetrics;
-    putImageData(imagedata: ImageData, dx: number, dy: number, dirtyX?: number, dirtyY?: number, dirtyWidth?: number, dirtyHeight?: number): void;
-    restore(): void;
-    rotate(angle: number): void;
-    save(): void;
-    scale(x: number, y: number): void;
-    setLineDash(segments: number[]): void;
-    setTransform(m11: number, m12: number, m21: number, m22: number, dx: number, dy: number): void;
-    stroke(path?: Path2D): void;
-    strokeRect(x: number, y: number, w: number, h: number): void;
-    strokeText(text: string, x: number, y: number, maxWidth?: number): void;
-    transform(m11: number, m12: number, m21: number, m22: number, dx: number, dy: number): void;
-    translate(x: number, y: number): void;
-}
-
-declare var CanvasRenderingContext2D: {
-    prototype: CanvasRenderingContext2D;
-    new(): CanvasRenderingContext2D;
-};
-
-interface ChannelMergerNode extends AudioNode {
-}
-
-declare var ChannelMergerNode: {
-    prototype: ChannelMergerNode;
-    new(): ChannelMergerNode;
-};
-
-interface ChannelSplitterNode extends AudioNode {
-}
-
-declare var ChannelSplitterNode: {
-    prototype: ChannelSplitterNode;
-    new(): ChannelSplitterNode;
-};
-
-interface CharacterData extends Node, ChildNode {
-    data: string;
-    readonly length: number;
-    appendData(arg: string): void;
-    deleteData(offset: number, count: number): void;
-    insertData(offset: number, arg: string): void;
-    replaceData(offset: number, count: number, arg: string): void;
-    substringData(offset: number, count: number): string;
-}
-
-declare var CharacterData: {
-    prototype: CharacterData;
-    new(): CharacterData;
-};
-
-interface ChildNode {
-    remove(): void;
-}
-
-interface ClientRect {
-    bottom: number;
-    readonly height: number;
-    left: number;
-    right: number;
-    top: number;
-    readonly width: number;
-}
-
-declare var ClientRect: {
-    prototype: ClientRect;
-    new(): ClientRect;
-};
-
-interface ClientRectList {
-    readonly length: number;
-    item(index: number): ClientRect;
-    [index: number]: ClientRect;
-}
-
-declare var ClientRectList: {
-    prototype: ClientRectList;
-    new(): ClientRectList;
-};
-
-interface ClipboardEvent extends Event {
-    readonly clipboardData: DataTransfer;
-}
-
-declare var ClipboardEvent: {
-    prototype: ClipboardEvent;
-    new(type: string, eventInitDict?: ClipboardEventInit): ClipboardEvent;
-};
-
-interface ClipboardEventInit extends EventInit {
-    data?: string;
-    dataType?: string;
-}
-
-interface CloseEvent extends Event {
-    readonly code: number;
-    readonly reason: string;
-    readonly wasClean: boolean;
-    /** @deprecated */
-    initCloseEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, wasCleanArg: boolean, codeArg: number, reasonArg: string): void;
-}
-
-declare var CloseEvent: {
-    prototype: CloseEvent;
-    new(type: string, eventInitDict?: CloseEventInit): CloseEvent;
-};
-
-interface Comment extends CharacterData {
-    text: string;
-}
-
-declare var Comment: {
-    prototype: Comment;
-    new(data?: string): Comment;
-};
-
-interface CompositionEvent extends UIEvent {
-    readonly data: string;
-    readonly locale: string;
-    initCompositionEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, dataArg: string, locale: string): void;
-}
-
-declare var CompositionEvent: {
-    prototype: CompositionEvent;
-    new(typeArg: string, eventInitDict?: CompositionEventInit): CompositionEvent;
-};
-
-interface ComputedTimingProperties {
-    activeDuration: number;
-    currentIteration: number | null;
-    endTime: number;
-    localTime: number | null;
-    progress: number | null;
-}
-
-interface ConcatParams extends Algorithm {
-    algorithmId: Uint8Array;
-    hash?: string | Algorithm;
-    partyUInfo: Uint8Array;
-    partyVInfo: Uint8Array;
-    privateInfo?: Uint8Array;
-    publicInfo?: Uint8Array;
-}
-
-interface Console {
-    memory: any;
-    assert(condition?: boolean, message?: string, ...data: any[]): void;
-    clear(): void;
-    count(label?: string): void;
-    debug(message?: any, ...optionalParams: any[]): void;
-    dir(value?: any, ...optionalParams: any[]): void;
-    dirxml(value: any): void;
-    error(message?: any, ...optionalParams: any[]): void;
-    exception(message?: string, ...optionalParams: any[]): void;
-    group(groupTitle?: string, ...optionalParams: any[]): void;
-    groupCollapsed(groupTitle?: string, ...optionalParams: any[]): void;
-    groupEnd(): void;
-    info(message?: any, ...optionalParams: any[]): void;
-    log(message?: any, ...optionalParams: any[]): void;
-    markTimeline(label?: string): void;
-    msIsIndependentlyComposed(element: Element): boolean;
-    profile(reportName?: string): void;
-    profileEnd(): void;
-    select(element: Element): void;
-    table(...tabularData: any[]): void;
-    time(label?: string): void;
-    timeEnd(label?: string): void;
-    timeStamp(label?: string): void;
-    timeline(label?: string): void;
-    timelineEnd(label?: string): void;
-    trace(message?: any, ...optionalParams: any[]): void;
-    warn(message?: any, ...optionalParams: any[]): void;
-}
-
-declare var Console: {
-    prototype: Console;
-    new(): Console;
-};
-
-interface ContentScriptGlobalScope extends EventTarget {
-    readonly msContentScript: ExtensionScriptApis;
-    readonly window: Window;
-}
-
-declare var ContentScriptGlobalScope: {
-    prototype: ContentScriptGlobalScope;
-    new(): ContentScriptGlobalScope;
-};
-
-interface ConvolverNode extends AudioNode {
-    buffer: AudioBuffer | null;
-    normalize: boolean;
-}
-
-declare var ConvolverNode: {
-    prototype: ConvolverNode;
-    new(): ConvolverNode;
-};
-
-interface Coordinates {
-    readonly accuracy: number;
-    readonly altitude: number | null;
-    readonly altitudeAccuracy: number | null;
-    readonly heading: number | null;
-    readonly latitude: number;
-    readonly longitude: number;
-    readonly speed: number | null;
-}
-
-declare var Coordinates: {
-    prototype: Coordinates;
-    new(): Coordinates;
-};
-
-interface CountQueuingStrategy {
-    highWaterMark: number;
-    size(): number;
-}
-
-declare var CountQueuingStrategy: {
-    prototype: CountQueuingStrategy;
-    new(strategy: QueuingStrategy): CountQueuingStrategy;
-};
-
-interface Crypto {
-    readonly subtle: SubtleCrypto;
-    getRandomValues(array: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | null): Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | null;
-}
-
-declare var Crypto: {
-    prototype: Crypto;
-    new(): Crypto;
-};
-
-interface CryptoKey {
-    readonly algorithm: KeyAlgorithm;
-    readonly extractable: boolean;
-    readonly type: string;
-    readonly usages: string[];
-}
-
-declare var CryptoKey: {
-    prototype: CryptoKey;
-    new(): CryptoKey;
-};
-
-interface CryptoKeyPair {
-    privateKey: CryptoKey;
-    publicKey: CryptoKey;
-}
-
-declare var CryptoKeyPair: {
-    prototype: CryptoKeyPair;
-    new(): CryptoKeyPair;
-};
-
-interface CustomElementRegistry {
-    define(name: string, constructor: Function, options?: ElementDefinitionOptions): void;
-    get(name: string): any;
-    whenDefined(name: string): PromiseLike<void>;
-}
-
-interface CustomEvent<T = any> extends Event {
-    readonly detail: T;
-    initCustomEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, detailArg: T): void;
-}
-
-declare var CustomEvent: {
-    prototype: CustomEvent;
-    new<T>(typeArg: string, eventInitDict?: CustomEventInit<T>): CustomEvent<T>;
-};
-
-interface DOMError {
-    readonly name: string;
-    toString(): string;
-}
-
-declare var DOMError: {
-    prototype: DOMError;
-    new(): DOMError;
-};
-
-interface DOMException {
-    readonly code: number;
-    readonly message: string;
-    readonly name: string;
-    toString(): string;
-    readonly ABORT_ERR: number;
-    readonly DATA_CLONE_ERR: number;
-    readonly DOMSTRING_SIZE_ERR: number;
-    readonly HIERARCHY_REQUEST_ERR: number;
-    readonly INDEX_SIZE_ERR: number;
-    readonly INUSE_ATTRIBUTE_ERR: number;
-    readonly INVALID_ACCESS_ERR: number;
-    readonly INVALID_CHARACTER_ERR: number;
-    readonly INVALID_MODIFICATION_ERR: number;
-    readonly INVALID_NODE_TYPE_ERR: number;
-    readonly INVALID_STATE_ERR: number;
-    readonly NAMESPACE_ERR: number;
-    readonly NETWORK_ERR: number;
-    readonly NOT_FOUND_ERR: number;
-    readonly NOT_SUPPORTED_ERR: number;
-    readonly NO_DATA_ALLOWED_ERR: number;
-    readonly NO_MODIFICATION_ALLOWED_ERR: number;
-    readonly PARSE_ERR: number;
-    readonly QUOTA_EXCEEDED_ERR: number;
-    readonly SECURITY_ERR: number;
-    readonly SERIALIZE_ERR: number;
-    readonly SYNTAX_ERR: number;
-    readonly TIMEOUT_ERR: number;
-    readonly TYPE_MISMATCH_ERR: number;
-    readonly URL_MISMATCH_ERR: number;
-    readonly VALIDATION_ERR: number;
-    readonly WRONG_DOCUMENT_ERR: number;
-}
-
-declare var DOMException: {
-    prototype: DOMException;
-    new(message?: string, name?: string): DOMException;
-    readonly ABORT_ERR: number;
-    readonly DATA_CLONE_ERR: number;
-    readonly DOMSTRING_SIZE_ERR: number;
-    readonly HIERARCHY_REQUEST_ERR: number;
-    readonly INDEX_SIZE_ERR: number;
-    readonly INUSE_ATTRIBUTE_ERR: number;
-    readonly INVALID_ACCESS_ERR: number;
-    readonly INVALID_CHARACTER_ERR: number;
-    readonly INVALID_MODIFICATION_ERR: number;
-    readonly INVALID_NODE_TYPE_ERR: number;
-    readonly INVALID_STATE_ERR: number;
-    readonly NAMESPACE_ERR: number;
-    readonly NETWORK_ERR: number;
-    readonly NOT_FOUND_ERR: number;
-    readonly NOT_SUPPORTED_ERR: number;
-    readonly NO_DATA_ALLOWED_ERR: number;
-    readonly NO_MODIFICATION_ALLOWED_ERR: number;
-    readonly PARSE_ERR: number;
-    readonly QUOTA_EXCEEDED_ERR: number;
-    readonly SECURITY_ERR: number;
-    readonly SERIALIZE_ERR: number;
-    readonly SYNTAX_ERR: number;
-    readonly TIMEOUT_ERR: number;
-    readonly TYPE_MISMATCH_ERR: number;
-    readonly URL_MISMATCH_ERR: number;
-    readonly VALIDATION_ERR: number;
-    readonly WRONG_DOCUMENT_ERR: number;
-};
-
-interface DOMImplementation {
-    createDocument(namespaceURI: string | null, qualifiedName: string | null, doctype: DocumentType | null): Document;
-    createDocumentType(qualifiedName: string, publicId: string, systemId: string): DocumentType;
-    createHTMLDocument(title?: string): Document;
-    hasFeature(feature: string | null, version: string | null): boolean;
-}
-
-declare var DOMImplementation: {
-    prototype: DOMImplementation;
-    new(): DOMImplementation;
-};
-
-interface DOML2DeprecatedColorProperty {
-    color: string;
-}
-
-interface DOML2DeprecatedSizeProperty {
-    size: number;
-}
-
-interface DOMParser {
-    parseFromString(source: string, mimeType: string): Document;
-}
-
-declare var DOMParser: {
-    prototype: DOMParser;
-    new(): DOMParser;
-};
-
-interface DOMRect extends DOMRectReadOnly {
-    height: number;
-    width: number;
-    x: number;
-    y: number;
-}
-
-declare var DOMRect: {
-    prototype: DOMRect;
-    new (x?: number, y?: number, width?: number, height?: number): DOMRect;
-    fromRect(rectangle?: DOMRectInit): DOMRect;
-};
-
-interface DOMRectList {
-    readonly length: number;
-    item(index: number): DOMRect | null;
-    [index: number]: DOMRect;
-}
-
-interface DOMRectReadOnly {
-    readonly bottom: number;
-    readonly height: number;
-    readonly left: number;
-    readonly right: number;
-    readonly top: number;
-    readonly width: number;
-    readonly x: number;
-    readonly y: number;
-}
-
-declare var DOMRectReadOnly: {
-    prototype: DOMRectReadOnly;
-    new (x?: number, y?: number, width?: number, height?: number): DOMRectReadOnly;
-    fromRect(rectangle?: DOMRectInit): DOMRectReadOnly;
-};
-
-interface DOMSettableTokenList extends DOMTokenList {
-    value: string;
-}
-
-declare var DOMSettableTokenList: {
-    prototype: DOMSettableTokenList;
-    new(): DOMSettableTokenList;
-};
-
-interface DOMStringList {
-    readonly length: number;
-    contains(str: string): boolean;
-    item(index: number): string | null;
-    [index: number]: string;
-}
-
-declare var DOMStringList: {
-    prototype: DOMStringList;
-    new(): DOMStringList;
-};
-
-interface DOMStringMap {
-    [name: string]: string | undefined;
-}
-
-declare var DOMStringMap: {
-    prototype: DOMStringMap;
-    new(): DOMStringMap;
-};
-
-interface DOMTokenList {
-    readonly length: number;
-    add(...tokens: string[]): void;
-    contains(token: string): boolean;
-    item(index: number): string | null;
-    remove(...tokens: string[]): void;
-    replace(oldToken: string, newToken: string): void;
-    toString(): string;
-    toggle(token: string, force?: boolean): boolean;
-    [index: number]: string;
-}
-
-declare var DOMTokenList: {
-    prototype: DOMTokenList;
-    new(): DOMTokenList;
-};
-
-interface DataCue extends TextTrackCue {
-    data: ArrayBuffer;
-    addEventListener<K extends keyof TextTrackCueEventMap>(type: K, listener: (this: DataCue, ev: TextTrackCueEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof TextTrackCueEventMap>(type: K, listener: (this: DataCue, ev: TextTrackCueEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var DataCue: {
-    prototype: DataCue;
-    new(): DataCue;
-};
-
-interface DataTransfer {
-    dropEffect: string;
-    effectAllowed: string;
-    readonly files: FileList;
-    readonly items: DataTransferItemList;
-    readonly types: string[];
-    clearData(format?: string): boolean;
-    getData(format: string): string;
-    setData(format: string, data: string): boolean;
-    setDragImage(image: Element, x: number, y: number): void;
-}
-
-declare var DataTransfer: {
-    prototype: DataTransfer;
-    new(): DataTransfer;
-};
-
-interface DataTransferItem {
-    readonly kind: string;
-    readonly type: string;
-    getAsFile(): File | null;
-    getAsString(_callback: FunctionStringCallback | null): void;
-    webkitGetAsEntry(): any;
-}
-
-declare var DataTransferItem: {
-    prototype: DataTransferItem;
-    new(): DataTransferItem;
-};
-
-interface DataTransferItemList {
-    readonly length: number;
-    add(data: File): DataTransferItem | null;
-    add(data: string, type: string): DataTransferItem | null;
-    clear(): void;
-    item(index: number): DataTransferItem;
-    remove(index: number): void;
-    [name: number]: DataTransferItem;
-}
-
-declare var DataTransferItemList: {
-    prototype: DataTransferItemList;
-    new(): DataTransferItemList;
-};
-
-interface DeferredPermissionRequest {
-    readonly id: number;
-    readonly type: MSWebViewPermissionType;
-    readonly uri: string;
-    allow(): void;
-    deny(): void;
-}
-
-declare var DeferredPermissionRequest: {
-    prototype: DeferredPermissionRequest;
-    new(): DeferredPermissionRequest;
-};
-
-interface DelayNode extends AudioNode {
-    readonly delayTime: AudioParam;
-}
-
-declare var DelayNode: {
-    prototype: DelayNode;
-    new(): DelayNode;
-};
-
-interface DeviceAcceleration {
-    readonly x: number | null;
-    readonly y: number | null;
-    readonly z: number | null;
-}
-
-declare var DeviceAcceleration: {
-    prototype: DeviceAcceleration;
-    new(): DeviceAcceleration;
-};
-
-interface DeviceLightEvent extends Event {
-    readonly value: number;
-}
-
-declare var DeviceLightEvent: {
-    prototype: DeviceLightEvent;
-    new(typeArg: string, eventInitDict?: DeviceLightEventInit): DeviceLightEvent;
-};
-
-interface DeviceMotionEvent extends Event {
-    readonly acceleration: DeviceAcceleration | null;
-    readonly accelerationIncludingGravity: DeviceAcceleration | null;
-    readonly interval: number | null;
-    readonly rotationRate: DeviceRotationRate | null;
-    initDeviceMotionEvent(type: string, bubbles: boolean, cancelable: boolean, acceleration: DeviceAccelerationDict | null, accelerationIncludingGravity: DeviceAccelerationDict | null, rotationRate: DeviceRotationRateDict | null, interval: number | null): void;
-}
-
-declare var DeviceMotionEvent: {
-    prototype: DeviceMotionEvent;
-    new(typeArg: string, eventInitDict?: DeviceMotionEventInit): DeviceMotionEvent;
-};
-
-interface DeviceOrientationEvent extends Event {
-    readonly absolute: boolean;
-    readonly alpha: number | null;
-    readonly beta: number | null;
-    readonly gamma: number | null;
-    initDeviceOrientationEvent(type: string, bubbles: boolean, cancelable: boolean, alpha: number | null, beta: number | null, gamma: number | null, absolute: boolean): void;
-}
-
-declare var DeviceOrientationEvent: {
-    prototype: DeviceOrientationEvent;
-    new(typeArg: string, eventInitDict?: DeviceOrientationEventInit): DeviceOrientationEvent;
-};
-
-interface DeviceRotationRate {
-    readonly alpha: number | null;
-    readonly beta: number | null;
-    readonly gamma: number | null;
-}
-
-declare var DeviceRotationRate: {
-    prototype: DeviceRotationRate;
-    new(): DeviceRotationRate;
-};
-
-interface DhImportKeyParams extends Algorithm {
-    generator: Uint8Array;
-    prime: Uint8Array;
-}
-
-interface DhKeyAlgorithm extends KeyAlgorithm {
-    generator: Uint8Array;
-    prime: Uint8Array;
-}
-
-interface DhKeyDeriveParams extends Algorithm {
-    public: CryptoKey;
-}
-
-interface DhKeyGenParams extends Algorithm {
-    generator: Uint8Array;
-    prime: Uint8Array;
-}
-
-interface DocumentEventMap extends GlobalEventHandlersEventMap {
-    "abort": UIEvent;
-    "activate": Event;
-    "beforeactivate": Event;
-    "beforedeactivate": Event;
-    "blur": FocusEvent;
-    "canplay": Event;
-    "canplaythrough": Event;
-    "change": Event;
-    "click": MouseEvent;
-    "contextmenu": PointerEvent;
-    "dblclick": MouseEvent;
-    "deactivate": Event;
-    "drag": DragEvent;
-    "dragend": DragEvent;
-    "dragenter": DragEvent;
-    "dragleave": DragEvent;
-    "dragover": DragEvent;
-    "dragstart": DragEvent;
-    "drop": DragEvent;
-    "durationchange": Event;
-    "emptied": Event;
-    "ended": Event;
-    "error": ErrorEvent;
-    "focus": FocusEvent;
-    "fullscreenchange": Event;
-    "fullscreenerror": Event;
-    "input": Event;
-    "invalid": Event;
-    "keydown": KeyboardEvent;
-    "keypress": KeyboardEvent;
-    "keyup": KeyboardEvent;
-    "load": Event;
-    "loadeddata": Event;
-    "loadedmetadata": Event;
-    "loadstart": Event;
-    "mousedown": MouseEvent;
-    "mousemove": MouseEvent;
-    "mouseout": MouseEvent;
-    "mouseover": MouseEvent;
-    "mouseup": MouseEvent;
-    "mousewheel": WheelEvent;
-    "MSContentZoom": Event;
-    "MSGestureChange": Event;
-    "MSGestureDoubleTap": Event;
-    "MSGestureEnd": Event;
-    "MSGestureHold": Event;
-    "MSGestureStart": Event;
-    "MSGestureTap": Event;
-    "MSInertiaStart": Event;
-    "MSManipulationStateChanged": Event;
-    "MSPointerCancel": Event;
-    "MSPointerDown": Event;
-    "MSPointerEnter": Event;
-    "MSPointerLeave": Event;
-    "MSPointerMove": Event;
-    "MSPointerOut": Event;
-    "MSPointerOver": Event;
-    "MSPointerUp": Event;
-    "mssitemodejumplistitemremoved": Event;
-    "msthumbnailclick": Event;
-    "pause": Event;
-    "play": Event;
-    "playing": Event;
-    "pointerlockchange": Event;
-    "pointerlockerror": Event;
-    "progress": ProgressEvent;
-    "ratechange": Event;
-    "readystatechange": Event;
-    "reset": Event;
-    "scroll": UIEvent;
-    "seeked": Event;
-    "seeking": Event;
-    "select": UIEvent;
-    "selectionchange": Event;
-    "selectstart": Event;
-    "stalled": Event;
-    "stop": Event;
-    "submit": Event;
-    "suspend": Event;
-    "timeupdate": Event;
-    "touchcancel": TouchEvent;
-    "touchend": TouchEvent;
-    "touchmove": TouchEvent;
-    "touchstart": TouchEvent;
-    "volumechange": Event;
-    "waiting": Event;
-    "webkitfullscreenchange": Event;
-    "webkitfullscreenerror": Event;
-}
-
-interface Document extends Node, GlobalEventHandlers, ParentNode, DocumentEvent {
-    /**
-     * Sets or gets the URL for the current document.
-     */
-    readonly URL: string;
-    /**
-     * Gets the URL for the document, stripped of any character encoding.
-     */
-    readonly URLUnencoded: string;
-    /**
-     * Gets the object that has the focus when the parent document has focus.
-     */
-    readonly activeElement: Element;
-    /**
-     * Sets or gets the color of all active links in the document.
-     */
-    alinkColor: string;
-    /**
-     * Returns a reference to the collection of elements contained by the object.
-     */
-    readonly all: HTMLAllCollection;
-    /**
-     * Retrieves a collection of all a objects that have a name and/or id property. Objects in this collection are in HTML source order.
-     */
-    readonly anchors: HTMLCollectionOf<HTMLAnchorElement>;
-    /**
-     * Retrieves a collection of all applet objects in the document.
-     */
-    readonly applets: HTMLCollectionOf<HTMLAppletElement>;
-    /**
-     * Deprecated. Sets or retrieves a value that indicates the background color behind the object.
-     */
-    bgColor: string;
-    /**
-     * Specifies the beginning and end of the document body.
-     */
-    body: HTMLElement;
-    readonly characterSet: string;
-    /**
-     * Gets or sets the character set used to encode the object.
-     */
-    charset: string;
-    /**
-     * Gets a value that indicates whether standards-compliant mode is switched on for the object.
-     */
-    readonly compatMode: string;
-    cookie: string;
-    readonly currentScript: HTMLScriptElement | SVGScriptElement | null;
-    readonly defaultView: Window;
-    /**
-     * Sets or gets a value that indicates whether the document can be edited.
-     */
-    designMode: string;
-    /**
-     * Sets or retrieves a value that indicates the reading order of the object.
-     */
-    dir: string;
-    /**
-     * Gets an object representing the document type declaration associated with the current document.
-     */
-    readonly doctype: DocumentType;
-    /**
-     * Gets a reference to the root node of the document.
-     */
-    readonly documentElement: HTMLElement;
-    /**
-     * Sets or gets the security domain of the document.
-     */
-    domain: string;
-    /**
-     * Retrieves a collection of all embed objects in the document.
-     */
-    readonly embeds: HTMLCollectionOf<HTMLEmbedElement>;
-    /**
-     * Sets or gets the foreground (text) color of the document.
-     */
-    fgColor: string;
-    /**
-     * Retrieves a collection, in source order, of all form objects in the document.
-     */
-    readonly forms: HTMLCollectionOf<HTMLFormElement>;
-    readonly fullscreenElement: Element | null;
-    readonly fullscreenEnabled: boolean;
-    readonly head: HTMLHeadElement;
-    readonly hidden: boolean;
-    /**
-     * Retrieves a collection, in source order, of img objects in the document.
-     */
-    readonly images: HTMLCollectionOf<HTMLImageElement>;
-    /**
-     * Gets the implementation object of the current document.
-     */
-    readonly implementation: DOMImplementation;
-    /**
-     * Returns the character encoding used to create the webpage that is loaded into the document object.
-     */
-    readonly inputEncoding: string | null;
-    /**
-     * Gets the date that the page was last modified, if the page supplies one.
-     */
-    readonly lastModified: string;
-    /**
-     * Sets or gets the color of the document links.
-     */
-    linkColor: string;
-    /**
-     * Retrieves a collection of all a objects that specify the href property and all area objects in the document.
-     */
-    readonly links: HTMLCollectionOf<HTMLAnchorElement | HTMLAreaElement>;
-    /**
-     * Contains information about the current URL.
-     */
-    location: Location;
-    msCSSOMElementFloatMetrics: boolean;
-    msCapsLockWarningOff: boolean;
-    /**
-     * Fires when the user aborts the download.
-     * @param ev The event.
-     */
-    onabort: ((this: Document, ev: UIEvent) => any) | null;
-    /**
-     * Fires when the object is set as the active element.
-     * @param ev The event.
-     */
-    onactivate: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires immediately before the object is set as the active element.
-     * @param ev The event.
-     */
-    onbeforeactivate: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires immediately before the activeElement is changed from the current object to another object in the parent document.
-     * @param ev The event.
-     */
-    onbeforedeactivate: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the object loses the input focus.
-     * @param ev The focus event.
-     */
-    onblur: ((this: Document, ev: FocusEvent) => any) | null;
-    /**
-     * Occurs when playback is possible, but would require further buffering.
-     * @param ev The event.
-     */
-    oncanplay: ((this: Document, ev: Event) => any) | null;
-    oncanplaythrough: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the contents of the object or selection have changed.
-     * @param ev The event.
-     */
-    onchange: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the user clicks the left mouse button on the object
-     * @param ev The mouse event.
-     */
-    onclick: ((this: Document, ev: MouseEvent) => any) | null;
-    /**
-     * Fires when the user clicks the right mouse button in the client area, opening the context menu.
-     * @param ev The mouse event.
-     */
-    oncontextmenu: ((this: Document, ev: PointerEvent) => any) | null;
-    /**
-     * Fires when the user double-clicks the object.
-     * @param ev The mouse event.
-     */
-    ondblclick: ((this: Document, ev: MouseEvent) => any) | null;
-    /**
-     * Fires when the activeElement is changed from the current object to another object in the parent document.
-     * @param ev The UI Event
-     */
-    ondeactivate: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires on the source object continuously during a drag operation.
-     * @param ev The event.
-     */
-    ondrag: ((this: Document, ev: DragEvent) => any) | null;
-    /**
-     * Fires on the source object when the user releases the mouse at the close of a drag operation.
-     * @param ev The event.
-     */
-    ondragend: ((this: Document, ev: DragEvent) => any) | null;
-    /**
-     * Fires on the target element when the user drags the object to a valid drop target.
-     * @param ev The drag event.
-     */
-    ondragenter: ((this: Document, ev: DragEvent) => any) | null;
-    /**
-     * Fires on the target object when the user moves the mouse out of a valid drop target during a drag operation.
-     * @param ev The drag event.
-     */
-    ondragleave: ((this: Document, ev: DragEvent) => any) | null;
-    /**
-     * Fires on the target element continuously while the user drags the object over a valid drop target.
-     * @param ev The event.
-     */
-    ondragover: ((this: Document, ev: DragEvent) => any) | null;
-    /**
-     * Fires on the source object when the user starts to drag a text selection or selected object.
-     * @param ev The event.
-     */
-    ondragstart: ((this: Document, ev: DragEvent) => any) | null;
-    ondrop: ((this: Document, ev: DragEvent) => any) | null;
-    /**
-     * Occurs when the duration attribute is updated.
-     * @param ev The event.
-     */
-    ondurationchange: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when the media element is reset to its initial state.
-     * @param ev The event.
-     */
-    onemptied: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when the end of playback is reached.
-     * @param ev The event
-     */
-    onended: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when an error occurs during object loading.
-     * @param ev The event.
-     */
-    onerror: ((this: Document, ev: ErrorEvent) => any) | null;
-    /**
-     * Fires when the object receives focus.
-     * @param ev The event.
-     */
-    onfocus: ((this: Document, ev: FocusEvent) => any) | null;
-    onfullscreenchange: ((this: Document, ev: Event) => any) | null;
-    onfullscreenerror: ((this: Document, ev: Event) => any) | null;
-    oninput: ((this: Document, ev: Event) => any) | null;
-    oninvalid: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the user presses a key.
-     * @param ev The keyboard event
-     */
-    onkeydown: ((this: Document, ev: KeyboardEvent) => any) | null;
-    /**
-     * Fires when the user presses an alphanumeric key.
-     * @param ev The event.
-     */
-    onkeypress: ((this: Document, ev: KeyboardEvent) => any) | null;
-    /**
-     * Fires when the user releases a key.
-     * @param ev The keyboard event
-     */
-    onkeyup: ((this: Document, ev: KeyboardEvent) => any) | null;
-    /**
-     * Fires immediately after the browser loads the object.
-     * @param ev The event.
-     */
-    onload: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when media data is loaded at the current playback position.
-     * @param ev The event.
-     */
-    onloadeddata: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when the duration and dimensions of the media have been determined.
-     * @param ev The event.
-     */
-    onloadedmetadata: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when Internet Explorer begins looking for media data.
-     * @param ev The event.
-     */
-    onloadstart: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the user clicks the object with either mouse button.
-     * @param ev The mouse event.
-     */
-    onmousedown: ((this: Document, ev: MouseEvent) => any) | null;
-    /**
-     * Fires when the user moves the mouse over the object.
-     * @param ev The mouse event.
-     */
-    onmousemove: ((this: Document, ev: MouseEvent) => any) | null;
-    /**
-     * Fires when the user moves the mouse pointer outside the boundaries of the object.
-     * @param ev The mouse event.
-     */
-    onmouseout: ((this: Document, ev: MouseEvent) => any) | null;
-    /**
-     * Fires when the user moves the mouse pointer into the object.
-     * @param ev The mouse event.
-     */
-    onmouseover: ((this: Document, ev: MouseEvent) => any) | null;
-    /**
-     * Fires when the user releases a mouse button while the mouse is over the object.
-     * @param ev The mouse event.
-     */
-    onmouseup: ((this: Document, ev: MouseEvent) => any) | null;
-    /**
-     * Fires when the wheel button is rotated.
-     * @param ev The mouse event
-     */
-    onmousewheel: ((this: Document, ev: WheelEvent) => any) | null;
-    onmscontentzoom: ((this: Document, ev: Event) => any) | null;
-    onmsgesturechange: ((this: Document, ev: Event) => any) | null;
-    onmsgesturedoubletap: ((this: Document, ev: Event) => any) | null;
-    onmsgestureend: ((this: Document, ev: Event) => any) | null;
-    onmsgesturehold: ((this: Document, ev: Event) => any) | null;
-    onmsgesturestart: ((this: Document, ev: Event) => any) | null;
-    onmsgesturetap: ((this: Document, ev: Event) => any) | null;
-    onmsinertiastart: ((this: Document, ev: Event) => any) | null;
-    onmsmanipulationstatechanged: ((this: Document, ev: Event) => any) | null;
-    onmspointercancel: ((this: Document, ev: Event) => any) | null;
-    onmspointerdown: ((this: Document, ev: Event) => any) | null;
-    onmspointerenter: ((this: Document, ev: Event) => any) | null;
-    onmspointerleave: ((this: Document, ev: Event) => any) | null;
-    onmspointermove: ((this: Document, ev: Event) => any) | null;
-    onmspointerout: ((this: Document, ev: Event) => any) | null;
-    onmspointerover: ((this: Document, ev: Event) => any) | null;
-    onmspointerup: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when an item is removed from a Jump List of a webpage running in Site Mode.
-     * @param ev The event.
-     */
-    onmssitemodejumplistitemremoved: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when a user clicks a button in a Thumbnail Toolbar of a webpage running in Site Mode.
-     * @param ev The event.
-     */
-    onmsthumbnailclick: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when playback is paused.
-     * @param ev The event.
-     */
-    onpause: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when the play method is requested.
-     * @param ev The event.
-     */
-    onplay: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when the audio or video has started playing.
-     * @param ev The event.
-     */
-    onplaying: ((this: Document, ev: Event) => any) | null;
-    onpointerlockchange: ((this: Document, ev: Event) => any) | null;
-    onpointerlockerror: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs to indicate progress while downloading media data.
-     * @param ev The event.
-     */
-    onprogress: ((this: Document, ev: ProgressEvent) => any) | null;
-    /**
-     * Occurs when the playback rate is increased or decreased.
-     * @param ev The event.
-     */
-    onratechange: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the state of the object has changed.
-     * @param ev The event
-     */
-    onreadystatechange: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the user resets a form.
-     * @param ev The event.
-     */
-    onreset: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the user repositions the scroll box in the scroll bar on the object.
-     * @param ev The event.
-     */
-    onscroll: ((this: Document, ev: UIEvent) => any) | null;
-    /**
-     * Occurs when the seek operation ends.
-     * @param ev The event.
-     */
-    onseeked: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when the current playback position is moved.
-     * @param ev The event.
-     */
-    onseeking: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the current selection changes.
-     * @param ev The event.
-     */
-    onselect: ((this: Document, ev: UIEvent) => any) | null;
-    /**
-     * Fires when the selection state of a document changes.
-     * @param ev The event.
-     */
-    onselectionchange: ((this: Document, ev: Event) => any) | null;
-    onselectstart: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when the download has stopped.
-     * @param ev The event.
-     */
-    onstalled: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the user clicks the Stop button or leaves the Web page.
-     * @param ev The event.
-     */
-    onstop: ((this: Document, ev: Event) => any) | null;
-    onsubmit: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs if the load operation has been intentionally halted.
-     * @param ev The event.
-     */
-    onsuspend: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs to indicate the current playback position.
-     * @param ev The event.
-     */
-    ontimeupdate: ((this: Document, ev: Event) => any) | null;
-    ontouchcancel: ((this: Document, ev: TouchEvent) => any) | null;
-    ontouchend: ((this: Document, ev: TouchEvent) => any) | null;
-    ontouchmove: ((this: Document, ev: TouchEvent) => any) | null;
-    ontouchstart: ((this: Document, ev: TouchEvent) => any) | null;
-    onvisibilitychange: (this: Document, ev: Event) => any;
-    /**
-     * Occurs when the volume is changed, or playback is muted or unmuted.
-     * @param ev The event.
-     */
-    onvolumechange: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when playback stops because the next frame of a video resource is not available.
-     * @param ev The event.
-     */
-    onwaiting: ((this: Document, ev: Event) => any) | null;
-    onwebkitfullscreenchange: ((this: Document, ev: Event) => any) | null;
-    onwebkitfullscreenerror: ((this: Document, ev: Event) => any) | null;
-    readonly plugins: HTMLCollectionOf<HTMLEmbedElement>;
-    readonly pointerLockElement: Element;
-    /**
-     * Retrieves a value that indicates the current state of the object.
-     */
-    readonly readyState: DocumentReadyState;
-    /**
-     * Gets the URL of the location that referred the user to the current page.
-     */
-    readonly referrer: string;
-    /**
-     * Gets the root svg element in the document hierarchy.
-     */
-    readonly rootElement: SVGSVGElement;
-    /**
-     * Retrieves a collection of all script objects in the document.
-     */
-    readonly scripts: HTMLCollectionOf<HTMLScriptElement>;
-    readonly scrollingElement: Element | null;
-    /**
-     * Retrieves a collection of styleSheet objects representing the style sheets that correspond to each instance of a link or style object in the document.
-     */
-    readonly styleSheets: StyleSheetList;
-    /**
-     * Contains the title of the document.
-     */
-    title: string;
-    readonly visibilityState: VisibilityState;
-    /**
-     * Sets or gets the color of the links that the user has visited.
-     */
-    vlinkColor: string;
-    readonly webkitCurrentFullScreenElement: Element | null;
-    readonly webkitFullscreenElement: Element | null;
-    readonly webkitFullscreenEnabled: boolean;
-    readonly webkitIsFullScreen: boolean;
-    readonly xmlEncoding: string | null;
-    xmlStandalone: boolean;
-    /**
-     * Gets or sets the version attribute specified in the declaration of an XML document.
-     */
-    xmlVersion: string | null;
-    adoptNode<T extends Node>(source: T): T;
-    captureEvents(): void;
-    caretRangeFromPoint(x: number, y: number): Range;
-    clear(): void;
-    /**
-     * Closes an output stream and forces the sent data to display.
-     */
-    close(): void;
-    /**
-     * Creates an attribute object with a specified name.
-     * @param name String that sets the attribute object's name.
-     */
-    createAttribute(name: string): Attr;
-    createAttributeNS(namespaceURI: string | null, qualifiedName: string): Attr;
-    createCDATASection(data: string): CDATASection;
-    /**
-     * Creates a comment object with the specified data.
-     * @param data Sets the comment object's data.
-     */
-    createComment(data: string): Comment;
-    /**
-     * Creates a new document.
-     */
-    createDocumentFragment(): DocumentFragment;
-    /**
-     * Creates an instance of the element for the specified tag.
-     * @param tagName The name of an element.
-     */
-    createElement<K extends keyof HTMLElementTagNameMap>(tagName: K, options?: ElementCreationOptions): HTMLElementTagNameMap[K];
-    createElement(tagName: string, options?: ElementCreationOptions): HTMLElement;
-    createElementNS(namespaceURI: "http://www.w3.org/1999/xhtml", qualifiedName: string): HTMLElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "a"): SVGAElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "circle"): SVGCircleElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "clipPath"): SVGClipPathElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "componentTransferFunction"): SVGComponentTransferFunctionElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "defs"): SVGDefsElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "desc"): SVGDescElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "ellipse"): SVGEllipseElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feBlend"): SVGFEBlendElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feColorMatrix"): SVGFEColorMatrixElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feComponentTransfer"): SVGFEComponentTransferElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feComposite"): SVGFECompositeElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feConvolveMatrix"): SVGFEConvolveMatrixElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feDiffuseLighting"): SVGFEDiffuseLightingElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feDisplacementMap"): SVGFEDisplacementMapElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feDistantLight"): SVGFEDistantLightElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feFlood"): SVGFEFloodElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feFuncA"): SVGFEFuncAElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feFuncB"): SVGFEFuncBElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feFuncG"): SVGFEFuncGElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feFuncR"): SVGFEFuncRElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feGaussianBlur"): SVGFEGaussianBlurElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feImage"): SVGFEImageElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feMerge"): SVGFEMergeElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feMergeNode"): SVGFEMergeNodeElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feMorphology"): SVGFEMorphologyElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feOffset"): SVGFEOffsetElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "fePointLight"): SVGFEPointLightElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feSpecularLighting"): SVGFESpecularLightingElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feSpotLight"): SVGFESpotLightElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feTile"): SVGFETileElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feTurbulence"): SVGFETurbulenceElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "filter"): SVGFilterElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "foreignObject"): SVGForeignObjectElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "g"): SVGGElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "image"): SVGImageElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "gradient"): SVGGradientElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "line"): SVGLineElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "linearGradient"): SVGLinearGradientElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "marker"): SVGMarkerElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "mask"): SVGMaskElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "path"): SVGPathElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "metadata"): SVGMetadataElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "pattern"): SVGPatternElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "polygon"): SVGPolygonElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "polyline"): SVGPolylineElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "radialGradient"): SVGRadialGradientElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "rect"): SVGRectElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "svg"): SVGSVGElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "script"): SVGScriptElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "stop"): SVGStopElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "style"): SVGStyleElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "switch"): SVGSwitchElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "symbol"): SVGSymbolElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "tspan"): SVGTSpanElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "textContent"): SVGTextContentElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "text"): SVGTextElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "textPath"): SVGTextPathElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "textPositioning"): SVGTextPositioningElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "title"): SVGTitleElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "use"): SVGUseElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "view"): SVGViewElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: string): SVGElement;
-    createElementNS(namespaceURI: string | null, qualifiedName: string): Element;
-    createExpression(expression: string, resolver: XPathNSResolver): XPathExpression;
-    createNSResolver(nodeResolver: Node): XPathNSResolver;
-    /**
-     * Creates a NodeIterator object that you can use to traverse filtered lists of nodes or elements in a document.
-     * @param root The root element or node to start traversing on.
-     * @param whatToShow The type of nodes or elements to appear in the node list
-     * @param filter A custom NodeFilter function to use. For more information, see filter. Use null for no filter.
-     * @param entityReferenceExpansion A flag that specifies whether entity reference nodes are expanded.
-     */
-    createNodeIterator(root: Node, whatToShow?: number, filter?: NodeFilter, entityReferenceExpansion?: boolean): NodeIterator;
-    createProcessingInstruction(target: string, data: string): ProcessingInstruction;
-    /**
-     *  Returns an empty range object that has both of its boundary points positioned at the beginning of the document.
-     */
-    createRange(): Range;
-    /**
-     * Creates a text string from the specified value.
-     * @param data String that specifies the nodeValue property of the text node.
-     */
-    createTextNode(data: string): Text;
-    createTouch(view: Window, target: EventTarget, identifier: number, pageX: number, pageY: number, screenX: number, screenY: number): Touch;
-    createTouchList(...touches: Touch[]): TouchList;
-    /**
-     * Creates a TreeWalker object that you can use to traverse filtered lists of nodes or elements in a document.
-     * @param root The root element or node to start traversing on.
-     * @param whatToShow The type of nodes or elements to appear in the node list. For more information, see whatToShow.
-     * @param filter A custom NodeFilter function to use.
-     * @param entityReferenceExpansion A flag that specifies whether entity reference nodes are expanded.
-     */
-    createTreeWalker(root: Node, whatToShow?: number, filter?: NodeFilter, entityReferenceExpansion?: boolean): TreeWalker;
-    /**
-     * Returns the element for the specified x coordinate and the specified y coordinate.
-     * @param x The x-offset
-     * @param y The y-offset
-     */
-    elementFromPoint(x: number, y: number): Element;
-    elementsFromPoint(x: number, y: number): Element[];
-    evaluate(expression: string, contextNode: Node, resolver: XPathNSResolver | null, type: number, result: XPathResult | null): XPathResult;
-    /**
-     * Executes a command on the current document, current selection, or the given range.
-     * @param commandId String that specifies the command to execute. This command can be any of the command identifiers that can be executed in script.
-     * @param showUI Display the user interface, defaults to false.
-     * @param value Value to assign.
-     */
-    execCommand(commandId: string, showUI?: boolean, value?: any): boolean;
-    /**
-     * Displays help information for the given command identifier.
-     * @param commandId Displays help information for the given command identifier.
-     */
-    execCommandShowHelp(commandId: string): boolean;
-    exitFullscreen(): void;
-    exitPointerLock(): void;
-    /**
-     * Causes the element to receive the focus and executes the code specified by the onfocus event.
-     */
-    /** @deprecated */
-    focus(): void;
-    /**
-     * Returns a reference to the first object with the specified value of the ID or NAME attribute.
-     * @param elementId String that specifies the ID value. Case-insensitive.
-     */
-    getElementById(elementId: string): HTMLElement | null;
-    getElementsByClassName(classNames: string): HTMLCollectionOf<Element>;
-    /**
-     * Gets a collection of objects based on the value of the NAME or ID attribute.
-     * @param elementName Gets a collection of objects based on the value of the NAME or ID attribute.
-     */
-    getElementsByName(elementName: string): NodeListOf<HTMLElement>;
-    /**
-     * Retrieves a collection of objects based on the specified element name.
-     * @param name Specifies the name of an element.
-     */
-    getElementsByTagName<K extends keyof HTMLElementTagNameMap>(tagname: K): NodeListOf<HTMLElementTagNameMap[K]>;
-    getElementsByTagName<K extends keyof SVGElementTagNameMap>(tagname: K): NodeListOf<SVGElementTagNameMap[K]>;
-    getElementsByTagName(tagname: string): NodeListOf<Element>;
-    getElementsByTagNameNS(namespaceURI: "http://www.w3.org/1999/xhtml", localName: string): HTMLCollectionOf<HTMLElement>;
-    getElementsByTagNameNS(namespaceURI: "http://www.w3.org/2000/svg", localName: string): HTMLCollectionOf<SVGElement>;
-    getElementsByTagNameNS(namespaceURI: string, localName: string): HTMLCollectionOf<Element>;
-    /**
-     * Returns an object representing the current selection of the document that is loaded into the object displaying a webpage.
-     */
-    getSelection(): Selection;
-    /**
-     * Gets a value indicating whether the object currently has focus.
-     */
-    hasFocus(): boolean;
-    importNode<T extends Node>(importedNode: T, deep: boolean): T;
-    msElementsFromPoint(x: number, y: number): NodeListOf<Element>;
-    msElementsFromRect(left: number, top: number, width: number, height: number): NodeListOf<Element>;
-    /**
-     * Opens a new window and loads a document specified by a given URL. Also, opens a new window that uses the url parameter and the name parameter to collect the output of the write method and the writeln method.
-     * @param url Specifies a MIME type for the document.
-     * @param name Specifies the name of the window. This name is used as the value for the TARGET attribute on a form or an anchor element.
-     * @param features Contains a list of items separated by commas. Each item consists of an option and a value, separated by an equals sign (for example, "fullscreen=yes, toolbar=yes"). The following values are supported.
-     * @param replace Specifies whether the existing entry for the document is replaced in the history list.
-     */
-    open(url?: string, name?: string, features?: string, replace?: boolean): Document;
-    /**
-     * Returns a Boolean value that indicates whether a specified command can be successfully executed using execCommand, given the current state of the document.
-     * @param commandId Specifies a command identifier.
-     */
-    queryCommandEnabled(commandId: string): boolean;
-    /**
-     * Returns a Boolean value that indicates whether the specified command is in the indeterminate state.
-     * @param commandId String that specifies a command identifier.
-     */
-    queryCommandIndeterm(commandId: string): boolean;
-    /**
-     * Returns a Boolean value that indicates the current state of the command.
-     * @param commandId String that specifies a command identifier.
-     */
-    queryCommandState(commandId: string): boolean;
-    /**
-     * Returns a Boolean value that indicates whether the current command is supported on the current range.
-     * @param commandId Specifies a command identifier.
-     */
-    queryCommandSupported(commandId: string): boolean;
-    /**
-     * Retrieves the string associated with a command.
-     * @param commandId String that contains the identifier of a command. This can be any command identifier given in the list of Command Identifiers.
-     */
-    queryCommandText(commandId: string): string;
-    /**
-     * Returns the current value of the document, range, or current selection for the given command.
-     * @param commandId String that specifies a command identifier.
-     */
-    queryCommandValue(commandId: string): string;
-    releaseEvents(): void;
-    updateSettings(): void;
-    webkitCancelFullScreen(): void;
-    webkitExitFullscreen(): void;
-    /**
-     * Writes one or more HTML expressions to a document in the specified window.
-     * @param content Specifies the text and HTML tags to write.
-     */
-    write(...content: string[]): void;
-    /**
-     * Writes one or more HTML expressions, followed by a carriage return, to a document in the specified window.
-     * @param content The text and HTML tags to write.
-     */
-    writeln(...content: string[]): void;
-    addEventListener<K extends keyof DocumentEventMap>(type: K, listener: (this: Document, ev: DocumentEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof DocumentEventMap>(type: K, listener: (this: Document, ev: DocumentEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var Document: {
-    prototype: Document;
-    new(): Document;
-};
-
-interface DocumentEvent {
-    createEvent(eventInterface: "AnimationEvent"): AnimationEvent;
-    createEvent(eventInterface: "AnimationPlaybackEvent"): AnimationPlaybackEvent;
-    createEvent(eventInterface: "AudioProcessingEvent"): AudioProcessingEvent;
-    createEvent(eventInterface: "BeforeUnloadEvent"): BeforeUnloadEvent;
-    createEvent(eventInterface: "ClipboardEvent"): ClipboardEvent;
-    createEvent(eventInterface: "CloseEvent"): CloseEvent;
-    createEvent(eventInterface: "CompositionEvent"): CompositionEvent;
-    createEvent(eventInterface: "CustomEvent"): CustomEvent;
-    createEvent(eventInterface: "DeviceLightEvent"): DeviceLightEvent;
-    createEvent(eventInterface: "DeviceMotionEvent"): DeviceMotionEvent;
-    createEvent(eventInterface: "DeviceOrientationEvent"): DeviceOrientationEvent;
-    createEvent(eventInterface: "DragEvent"): DragEvent;
-    createEvent(eventInterface: "ErrorEvent"): ErrorEvent;
-    createEvent(eventInterface: "Event"): Event;
-    createEvent(eventInterface: "Events"): Event;
-    createEvent(eventInterface: "FocusEvent"): FocusEvent;
-    createEvent(eventInterface: "FocusNavigationEvent"): FocusNavigationEvent;
-    createEvent(eventInterface: "GamepadEvent"): GamepadEvent;
-    createEvent(eventInterface: "HashChangeEvent"): HashChangeEvent;
-    createEvent(eventInterface: "IDBVersionChangeEvent"): IDBVersionChangeEvent;
-    createEvent(eventInterface: "KeyboardEvent"): KeyboardEvent;
-    createEvent(eventInterface: "ListeningStateChangedEvent"): ListeningStateChangedEvent;
-    createEvent(eventInterface: "MSDCCEvent"): MSDCCEvent;
-    createEvent(eventInterface: "MSDSHEvent"): MSDSHEvent;
-    createEvent(eventInterface: "MSMediaKeyMessageEvent"): MSMediaKeyMessageEvent;
-    createEvent(eventInterface: "MSMediaKeyNeededEvent"): MSMediaKeyNeededEvent;
-    createEvent(eventInterface: "MediaEncryptedEvent"): MediaEncryptedEvent;
-    createEvent(eventInterface: "MediaKeyMessageEvent"): MediaKeyMessageEvent;
-    createEvent(eventInterface: "MediaStreamErrorEvent"): MediaStreamErrorEvent;
-    createEvent(eventInterface: "MediaStreamEvent"): MediaStreamEvent;
-    createEvent(eventInterface: "MediaStreamTrackEvent"): MediaStreamTrackEvent;
-    createEvent(eventInterface: "MessageEvent"): MessageEvent;
-    createEvent(eventInterface: "MouseEvent"): MouseEvent;
-    createEvent(eventInterface: "MouseEvents"): MouseEvent;
-    createEvent(eventInterface: "MutationEvent"): MutationEvent;
-    createEvent(eventInterface: "MutationEvents"): MutationEvent;
-    createEvent(eventInterface: "OfflineAudioCompletionEvent"): OfflineAudioCompletionEvent;
-    createEvent(eventInterface: "OverflowEvent"): OverflowEvent;
-    createEvent(eventInterface: "PageTransitionEvent"): PageTransitionEvent;
-    createEvent(eventInterface: "PaymentRequestUpdateEvent"): PaymentRequestUpdateEvent;
-    createEvent(eventInterface: "PermissionRequestedEvent"): PermissionRequestedEvent;
-    createEvent(eventInterface: "PointerEvent"): PointerEvent;
-    createEvent(eventInterface: "PopStateEvent"): PopStateEvent;
-    createEvent(eventInterface: "ProgressEvent"): ProgressEvent;
-    createEvent(eventInterface: "PromiseRejectionEvent"): PromiseRejectionEvent;
-    createEvent(eventInterface: "RTCDTMFToneChangeEvent"): RTCDTMFToneChangeEvent;
-    createEvent(eventInterface: "RTCDtlsTransportStateChangedEvent"): RTCDtlsTransportStateChangedEvent;
-    createEvent(eventInterface: "RTCIceCandidatePairChangedEvent"): RTCIceCandidatePairChangedEvent;
-    createEvent(eventInterface: "RTCIceGathererEvent"): RTCIceGathererEvent;
-    createEvent(eventInterface: "RTCIceTransportStateChangedEvent"): RTCIceTransportStateChangedEvent;
-    createEvent(eventInterface: "RTCPeerConnectionIceEvent"): RTCPeerConnectionIceEvent;
-    createEvent(eventInterface: "RTCSsrcConflictEvent"): RTCSsrcConflictEvent;
-    createEvent(eventInterface: "SVGZoomEvent"): SVGZoomEvent;
-    createEvent(eventInterface: "SVGZoomEvents"): SVGZoomEvent;
-    createEvent(eventInterface: "SecurityPolicyViolationEvent"): SecurityPolicyViolationEvent;
-    createEvent(eventInterface: "ServiceWorkerMessageEvent"): ServiceWorkerMessageEvent;
-    createEvent(eventInterface: "SpeechSynthesisEvent"): SpeechSynthesisEvent;
-    createEvent(eventInterface: "StorageEvent"): StorageEvent;
-    createEvent(eventInterface: "TextEvent"): TextEvent;
-    createEvent(eventInterface: "TouchEvent"): TouchEvent;
-    createEvent(eventInterface: "TrackEvent"): TrackEvent;
-    createEvent(eventInterface: "TransitionEvent"): TransitionEvent;
-    createEvent(eventInterface: "UIEvent"): UIEvent;
-    createEvent(eventInterface: "UIEvents"): UIEvent;
-    createEvent(eventInterface: "VRDisplayEvent"): VRDisplayEvent;
-    createEvent(eventInterface: "VRDisplayEvent "): VRDisplayEvent ;
-    createEvent(eventInterface: "WebGLContextEvent"): WebGLContextEvent;
-    createEvent(eventInterface: "WheelEvent"): WheelEvent;
-    createEvent(eventInterface: string): Event;
-}
-
-interface DocumentFragment extends Node, ParentNode {
-    getElementById(elementId: string): HTMLElement | null;
-}
-
-declare var DocumentFragment: {
-    prototype: DocumentFragment;
-    new(): DocumentFragment;
-};
-
-interface DocumentOrShadowRoot {
-    readonly activeElement: Element | null;
-    readonly styleSheets: StyleSheetList;
-    elementFromPoint(x: number, y: number): Element | null;
-    elementsFromPoint(x: number, y: number): Element[];
-    getSelection(): Selection | null;
-}
-
-interface DocumentType extends Node, ChildNode {
-    readonly entities: NamedNodeMap;
-    readonly internalSubset: string | null;
-    readonly name: string;
-    readonly notations: NamedNodeMap;
-    readonly publicId: string;
-    readonly systemId: string;
-}
-
-declare var DocumentType: {
-    prototype: DocumentType;
-    new(): DocumentType;
-};
-
-interface DragEvent extends MouseEvent {
-    readonly dataTransfer: DataTransfer;
-    initDragEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number, screenXArg: number, screenYArg: number, clientXArg: number, clientYArg: number, ctrlKeyArg: boolean, altKeyArg: boolean, shiftKeyArg: boolean, metaKeyArg: boolean, buttonArg: number, relatedTargetArg: EventTarget, dataTransferArg: DataTransfer): void;
-    msConvertURL(file: File, targetType: string, targetURL?: string): void;
-}
-
-declare var DragEvent: {
-    prototype: DragEvent;
-    new(type: "drag" | "dragend" | "dragenter" | "dragexit" | "dragleave" | "dragover" | "dragstart" | "drop", dragEventInit?: { dataTransfer?: DataTransfer }): DragEvent;
-};
-
-interface DynamicsCompressorNode extends AudioNode {
-    readonly attack: AudioParam;
-    readonly knee: AudioParam;
-    readonly ratio: AudioParam;
-    readonly reduction: number;
-    readonly release: AudioParam;
-    readonly threshold: AudioParam;
-}
-
-declare var DynamicsCompressorNode: {
-    prototype: DynamicsCompressorNode;
-    new(): DynamicsCompressorNode;
-};
-
-interface EXT_blend_minmax {
-    readonly MAX_EXT: number;
-    readonly MIN_EXT: number;
-}
-
-interface EXT_frag_depth {
-}
-
-interface EXT_sRGB {
-    readonly FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING_EXT: number;
-    readonly SRGB8_ALPHA8_EXT: number;
-    readonly SRGB_ALPHA_EXT: number;
-    readonly SRGB_EXT: number;
-}
-
-interface EXT_shader_texture_lod {
-}
-
-interface EXT_texture_filter_anisotropic {
-    readonly MAX_TEXTURE_MAX_ANISOTROPY_EXT: number;
-    readonly TEXTURE_MAX_ANISOTROPY_EXT: number;
-}
-
-declare var EXT_texture_filter_anisotropic: {
-    prototype: EXT_texture_filter_anisotropic;
-    new(): EXT_texture_filter_anisotropic;
-    readonly MAX_TEXTURE_MAX_ANISOTROPY_EXT: number;
-    readonly TEXTURE_MAX_ANISOTROPY_EXT: number;
-};
-
-interface ElementEventMap extends GlobalEventHandlersEventMap {
-    "ariarequest": Event;
-    "command": Event;
-    "gotpointercapture": PointerEvent;
-    "lostpointercapture": PointerEvent;
-    "MSGestureChange": Event;
-    "MSGestureDoubleTap": Event;
-    "MSGestureEnd": Event;
-    "MSGestureHold": Event;
-    "MSGestureStart": Event;
-    "MSGestureTap": Event;
-    "MSGotPointerCapture": Event;
-    "MSInertiaStart": Event;
-    "MSLostPointerCapture": Event;
-    "MSPointerCancel": Event;
-    "MSPointerDown": Event;
-    "MSPointerEnter": Event;
-    "MSPointerLeave": Event;
-    "MSPointerMove": Event;
-    "MSPointerOut": Event;
-    "MSPointerOver": Event;
-    "MSPointerUp": Event;
-    "touchcancel": TouchEvent;
-    "touchend": TouchEvent;
-    "touchmove": TouchEvent;
-    "touchstart": TouchEvent;
-    "webkitfullscreenchange": Event;
-    "webkitfullscreenerror": Event;
-}
-
-interface Element extends Node, GlobalEventHandlers, ElementTraversal, ParentNode, ChildNode {
-    readonly assignedSlot: HTMLSlotElement | null;
-    readonly attributes: NamedNodeMap;
-    readonly classList: DOMTokenList;
-    className: string;
-    readonly clientHeight: number;
-    readonly clientLeft: number;
-    readonly clientTop: number;
-    readonly clientWidth: number;
-    id: string;
-    innerHTML: string;
-    msContentZoomFactor: number;
-    readonly msRegionOverflow: string;
-    onariarequest: ((this: Element, ev: Event) => any) | null;
-    oncommand: ((this: Element, ev: Event) => any) | null;
-    ongotpointercapture: ((this: Element, ev: PointerEvent) => any) | null;
-    onlostpointercapture: ((this: Element, ev: PointerEvent) => any) | null;
-    onmsgesturechange: ((this: Element, ev: Event) => any) | null;
-    onmsgesturedoubletap: ((this: Element, ev: Event) => any) | null;
-    onmsgestureend: ((this: Element, ev: Event) => any) | null;
-    onmsgesturehold: ((this: Element, ev: Event) => any) | null;
-    onmsgesturestart: ((this: Element, ev: Event) => any) | null;
-    onmsgesturetap: ((this: Element, ev: Event) => any) | null;
-    onmsgotpointercapture: ((this: Element, ev: Event) => any) | null;
-    onmsinertiastart: ((this: Element, ev: Event) => any) | null;
-    onmslostpointercapture: ((this: Element, ev: Event) => any) | null;
-    onmspointercancel: ((this: Element, ev: Event) => any) | null;
-    onmspointerdown: ((this: Element, ev: Event) => any) | null;
-    onmspointerenter: ((this: Element, ev: Event) => any) | null;
-    onmspointerleave: ((this: Element, ev: Event) => any) | null;
-    onmspointermove: ((this: Element, ev: Event) => any) | null;
-    onmspointerout: ((this: Element, ev: Event) => any) | null;
-    onmspointerover: ((this: Element, ev: Event) => any) | null;
-    onmspointerup: ((this: Element, ev: Event) => any) | null;
-    ontouchcancel: ((this: Element, ev: TouchEvent) => any) | null;
-    ontouchend: ((this: Element, ev: TouchEvent) => any) | null;
-    ontouchmove: ((this: Element, ev: TouchEvent) => any) | null;
-    ontouchstart: ((this: Element, ev: TouchEvent) => any) | null;
-    onwebkitfullscreenchange: ((this: Element, ev: Event) => any) | null;
-    onwebkitfullscreenerror: ((this: Element, ev: Event) => any) | null;
-    outerHTML: string;
-    readonly prefix: string | null;
-    readonly scrollHeight: number;
-    scrollLeft: number;
-    scrollTop: number;
-    readonly scrollWidth: number;
-    readonly shadowRoot: ShadowRoot | null;
-    slot: string;
-    readonly tagName: string;
-    attachShadow(shadowRootInitDict: ShadowRootInit): ShadowRoot;
-    closest<K extends keyof HTMLElementTagNameMap>(selector: K): HTMLElementTagNameMap[K] | null;
-    closest<K extends keyof SVGElementTagNameMap>(selector: K): SVGElementTagNameMap[K] | null;
-    closest(selector: string): Element | null;
-    getAttribute(qualifiedName: string): string | null;
-    getAttributeNS(namespaceURI: string, localName: string): string;
-    getAttributeNode(name: string): Attr | null;
-    getAttributeNodeNS(namespaceURI: string, localName: string): Attr | null;
-    getBoundingClientRect(): ClientRect | DOMRect;
-    getClientRects(): ClientRectList | DOMRectList;
-    getElementsByClassName(classNames: string): NodeListOf<Element>;
-    getElementsByTagName<K extends keyof HTMLElementTagNameMap>(name: K): NodeListOf<HTMLElementTagNameMap[K]>;
-    getElementsByTagName<K extends keyof SVGElementTagNameMap>(name: K): NodeListOf<SVGElementTagNameMap[K]>;
-    getElementsByTagName(name: string): NodeListOf<Element>;
-    getElementsByTagNameNS(namespaceURI: "http://www.w3.org/1999/xhtml", localName: string): HTMLCollectionOf<HTMLElement>;
-    getElementsByTagNameNS(namespaceURI: "http://www.w3.org/2000/svg", localName: string): HTMLCollectionOf<SVGElement>;
-    getElementsByTagNameNS(namespaceURI: string, localName: string): HTMLCollectionOf<Element>;
-    hasAttribute(name: string): boolean;
-    hasAttributeNS(namespaceURI: string, localName: string): boolean;
-    hasAttributes(): boolean;
-    insertAdjacentElement(position: InsertPosition, insertedElement: Element): Element | null;
-    insertAdjacentHTML(where: InsertPosition, html: string): void;
-    insertAdjacentText(where: InsertPosition, text: string): void;
-    matches(selectors: string): boolean;
-    msGetRegionContent(): any;
-    msGetUntransformedBounds(): ClientRect;
-    msMatchesSelector(selectors: string): boolean;
-    msReleasePointerCapture(pointerId: number): void;
-    msSetPointerCapture(pointerId: number): void;
-    msZoomTo(args: MsZoomToOptions): void;
-    releasePointerCapture(pointerId: number): void;
-    removeAttribute(qualifiedName: string): void;
-    removeAttributeNS(namespaceURI: string, localName: string): void;
-    removeAttributeNode(oldAttr: Attr): Attr;
-    requestFullscreen(): void;
-    requestPointerLock(): void;
-    scroll(options?: ScrollToOptions): void;
-    scroll(x: number, y: number): void;
-    scrollBy(options?: ScrollToOptions): void;
-    scrollBy(x: number, y: number): void;
-    scrollIntoView(arg?: boolean | ScrollIntoViewOptions): void;
-    scrollTo(options?: ScrollToOptions): void;
-    scrollTo(x: number, y: number): void;
-    setAttribute(qualifiedName: string, value: string): void;
-    setAttributeNS(namespaceURI: string, qualifiedName: string, value: string): void;
-    setAttributeNode(newAttr: Attr): Attr;
-    setAttributeNodeNS(newAttr: Attr): Attr;
-    setPointerCapture(pointerId: number): void;
-    webkitMatchesSelector(selectors: string): boolean;
-    webkitRequestFullScreen(): void;
-    webkitRequestFullscreen(): void;
-    addEventListener<K extends keyof ElementEventMap>(type: K, listener: (this: Element, ev: ElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof ElementEventMap>(type: K, listener: (this: Element, ev: ElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var Element: {
-    prototype: Element;
-    new(): Element;
-};
-
-interface ElementCSSInlineStyle {
-    readonly style: CSSStyleDeclaration;
-}
-
-interface ElementCreationOptions {
-    is?: string;
-}
-
-interface ElementDefinitionOptions {
-    extends: string;
-}
-
-interface ElementTraversal {
-    readonly childElementCount: number;
-    readonly firstElementChild: Element | null;
-    readonly lastElementChild: Element | null;
-    readonly nextElementSibling: Element | null;
-    readonly previousElementSibling: Element | null;
-}
-
-interface ErrorEvent extends Event {
-    readonly colno: number;
-    readonly error: any;
-    readonly filename: string;
-    readonly lineno: number;
-    readonly message: string;
-    initErrorEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, messageArg: string, filenameArg: string, linenoArg: number): void;
-}
-
-declare var ErrorEvent: {
-    prototype: ErrorEvent;
-    new(typeArg: string, eventInitDict?: ErrorEventInit): ErrorEvent;
-};
-
-interface Event {
-    readonly bubbles: boolean;
-    cancelBubble: boolean;
-    readonly cancelable: boolean;
-    readonly currentTarget: EventTarget | null;
-    readonly defaultPrevented: boolean;
-    readonly eventPhase: number;
-    readonly isTrusted: boolean;
-    returnValue: boolean;
-    readonly scoped: boolean;
-    readonly srcElement: Element | null;
-    readonly target: EventTarget | null;
-    readonly timeStamp: number;
-    readonly type: string;
-    deepPath(): EventTarget[];
-    initEvent(type: string, bubbles?: boolean, cancelable?: boolean): void;
-    preventDefault(): void;
-    stopImmediatePropagation(): void;
-    stopPropagation(): void;
-    readonly AT_TARGET: number;
-    readonly BUBBLING_PHASE: number;
-    readonly CAPTURING_PHASE: number;
-    readonly NONE: number;
-}
-
-declare var Event: {
-    prototype: Event;
-    new(typeArg: string, eventInitDict?: EventInit): Event;
-    readonly AT_TARGET: number;
-    readonly BUBBLING_PHASE: number;
-    readonly CAPTURING_PHASE: number;
-    readonly NONE: number;
-};
-
-interface EventListenerObject {
-    handleEvent(evt: Event): void;
-}
-
-interface EventSource extends EventTarget {
-    readonly CLOSED: number;
-    readonly CONNECTING: number;
-    readonly OPEN: number;
-    onerror: (evt: MessageEvent) => any;
-    onmessage: (evt: MessageEvent) => any;
-    onopen: (evt: MessageEvent) => any;
-    readonly readyState: number;
-    readonly url: string;
-    readonly withCredentials: boolean;
-    close(): void;
-}
-
-declare var EventSource: {
-    prototype: EventSource;
-    new(url: string, eventSourceInitDict?: EventSourceInit): EventSource;
-};
-
-interface EventSourceInit {
-    readonly withCredentials: boolean;
-}
-
-interface EventTarget {
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject | null, options?: boolean | AddEventListenerOptions): void;
-    dispatchEvent(evt: Event): boolean;
-    removeEventListener(type: string, listener?: EventListenerOrEventListenerObject | null, options?: EventListenerOptions | boolean): void;
-}
-
-declare var EventTarget: {
-    prototype: EventTarget;
-    new(): EventTarget;
-};
-
-interface ExtensionScriptApis {
-    extensionIdToShortId(extensionId: string): number;
-    fireExtensionApiTelemetry(functionName: string, isSucceeded: boolean, isSupported: boolean, errorString: string): void;
-    genericFunction(routerAddress: any, parameters?: string, callbackId?: number): void;
-    genericSynchronousFunction(functionId: number, parameters?: string): string;
-    genericWebRuntimeCallout(to: any, from: any, payload: string): void;
-    getExtensionId(): string;
-    registerGenericFunctionCallbackHandler(callbackHandler: Function): void;
-    registerGenericPersistentCallbackHandler(callbackHandler: Function): void;
-    registerWebRuntimeCallbackHandler(handler: Function): any;
-}
-
-declare var ExtensionScriptApis: {
-    prototype: ExtensionScriptApis;
-    new(): ExtensionScriptApis;
-};
-
-interface External {
-}
-
-declare var External: {
-    prototype: External;
-    new(): External;
-};
-
-interface File extends Blob {
-    readonly lastModified: number;
-    /** @deprecated */
-    readonly lastModifiedDate: Date;
-    readonly name: string;
-    readonly webkitRelativePath: string;
-}
-
-declare var File: {
-    prototype: File;
-    new (parts: (ArrayBuffer | ArrayBufferView | Blob | string)[], filename: string, properties?: FilePropertyBag): File;
-};
-
-interface FileList {
-    readonly length: number;
-    item(index: number): File | null;
-    [index: number]: File;
-}
-
-declare var FileList: {
-    prototype: FileList;
-    new(): FileList;
-};
-
-interface FilePropertyBag extends BlobPropertyBag {
-    lastModified?: number;
-}
-
-interface FileReaderEventMap {
-    "abort": ProgressEvent;
-    "error": ProgressEvent;
-    "load": ProgressEvent;
-    "loadend": ProgressEvent;
-    "loadstart": ProgressEvent;
-    "progress": ProgressEvent;
-}
-
-interface FileReader extends EventTarget {
-    readonly error: DOMException | null;
-    onabort: ((this: FileReader, ev: FileReaderProgressEvent) => any) | null;
-    onerror: ((this: FileReader, ev: FileReaderProgressEvent) => any) | null;
-    onload: ((this: FileReader, ev: FileReaderProgressEvent) => any) | null;
-    onloadend: ((this: FileReader, ev: FileReaderProgressEvent) => any) | null;
-    onloadstart: ((this: FileReader, ev: FileReaderProgressEvent) => any) | null;
-    onprogress: ((this: FileReader, ev: FileReaderProgressEvent) => any) | null;
-    readonly readyState: number;
-    readonly result: any;
-    abort(): void;
-    readAsArrayBuffer(blob: Blob): void;
-    readAsBinaryString(blob: Blob): void;
-    readAsDataURL(blob: Blob): void;
-    readAsText(blob: Blob, label?: string): void;
-    readonly DONE: number;
-    readonly EMPTY: number;
-    readonly LOADING: number;
-    addEventListener<K extends keyof FileReaderEventMap>(type: K, listener: (this: FileReader, ev: FileReaderEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof FileReaderEventMap>(type: K, listener: (this: FileReader, ev: FileReaderEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var FileReader: {
-    prototype: FileReader;
-    new(): FileReader;
-    readonly DONE: number;
-    readonly EMPTY: number;
-    readonly LOADING: number;
-};
-
-interface FileReaderProgressEvent extends ProgressEvent {
-    readonly target: FileReader | null;
-}
-
-interface FocusEvent extends UIEvent {
-    readonly relatedTarget: EventTarget;
-    initFocusEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number, relatedTargetArg: EventTarget): void;
-}
-
-declare var FocusEvent: {
-    prototype: FocusEvent;
-    new(typeArg: string, eventInitDict?: FocusEventInit): FocusEvent;
-};
-
-interface FocusNavigationEvent extends Event {
-    readonly navigationReason: NavigationReason;
-    readonly originHeight: number;
-    readonly originLeft: number;
-    readonly originTop: number;
-    readonly originWidth: number;
-    requestFocus(): void;
-}
-
-declare var FocusNavigationEvent: {
-    prototype: FocusNavigationEvent;
-    new(type: string, eventInitDict?: FocusNavigationEventInit): FocusNavigationEvent;
-};
-
-interface FormData {
-    append(name: string, value: string | Blob, fileName?: string): void;
-    delete(name: string): void;
-    get(name: string): FormDataEntryValue | null;
-    getAll(name: string): FormDataEntryValue[];
-    has(name: string): boolean;
-    set(name: string, value: string | Blob, fileName?: string): void;
-}
-
-declare var FormData: {
-    prototype: FormData;
-    new(): FormData;
-    new(form: HTMLFormElement): FormData;
-};
-
-interface GainNode extends AudioNode {
-    readonly gain: AudioParam;
-}
-
-declare var GainNode: {
-    prototype: GainNode;
-    new(): GainNode;
-};
-
-interface Gamepad {
-    readonly axes: number[];
-    readonly buttons: GamepadButton[];
-    readonly connected: boolean;
-    readonly displayId: number;
-    readonly hand: GamepadHand;
-    readonly hapticActuators: GamepadHapticActuator[];
-    readonly id: string;
-    readonly index: number;
-    readonly mapping: GamepadMappingType;
-    readonly pose: GamepadPose | null;
-    readonly timestamp: number;
-}
-
-declare var Gamepad: {
-    prototype: Gamepad;
-    new(): Gamepad;
-};
-
-interface GamepadButton {
-    readonly pressed: boolean;
-    readonly touched: boolean;
-    readonly value: number;
-}
-
-declare var GamepadButton: {
-    prototype: GamepadButton;
-    new(): GamepadButton;
-};
-
-interface GamepadEvent extends Event {
-    readonly gamepad: Gamepad;
-}
-
-declare var GamepadEvent: {
-    prototype: GamepadEvent;
-    new(typeArg: string, eventInitDict?: GamepadEventInit): GamepadEvent;
-};
-
-interface GamepadHapticActuator {
-    readonly type: GamepadHapticActuatorType;
-    pulse(value: number, duration: number): Promise<boolean>;
-}
-
-declare var GamepadHapticActuator: {
-    prototype: GamepadHapticActuator;
-    new(): GamepadHapticActuator;
-};
-
-interface GamepadPose {
-    readonly angularAcceleration: Float32Array | null;
-    readonly angularVelocity: Float32Array | null;
-    readonly hasOrientation: boolean;
-    readonly hasPosition: boolean;
-    readonly linearAcceleration: Float32Array | null;
-    readonly linearVelocity: Float32Array | null;
-    readonly orientation: Float32Array | null;
-    readonly position: Float32Array | null;
-}
-
-declare var GamepadPose: {
-    prototype: GamepadPose;
-    new(): GamepadPose;
-};
-
-interface Geolocation {
-    clearWatch(watchId: number): void;
-    getCurrentPosition(successCallback: PositionCallback, errorCallback?: PositionErrorCallback, options?: PositionOptions): void;
-    watchPosition(successCallback: PositionCallback, errorCallback?: PositionErrorCallback, options?: PositionOptions): number;
-}
-
-declare var Geolocation: {
-    prototype: Geolocation;
-    new(): Geolocation;
-};
-
-interface GetSVGDocument {
-    getSVGDocument(): Document;
-}
-
-interface GlobalEventHandlersEventMap {
-    "pointercancel": PointerEvent;
-    "pointerdown": PointerEvent;
-    "pointerenter": PointerEvent;
-    "pointerleave": PointerEvent;
-    "pointermove": PointerEvent;
-    "pointerout": PointerEvent;
-    "pointerover": PointerEvent;
-    "pointerup": PointerEvent;
-    "wheel": WheelEvent;
-}
-
-interface GlobalEventHandlers {
-    onpointercancel: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
-    onpointerdown: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
-    onpointerenter: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
-    onpointerleave: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
-    onpointermove: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
-    onpointerout: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
-    onpointerover: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
-    onpointerup: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
-    onwheel: ((this: GlobalEventHandlers, ev: WheelEvent) => any) | null;
-    addEventListener<K extends keyof GlobalEventHandlersEventMap>(type: K, listener: (this: GlobalEventHandlers, ev: GlobalEventHandlersEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof GlobalEventHandlersEventMap>(type: K, listener: (this: GlobalEventHandlers, ev: GlobalEventHandlersEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-interface GlobalFetch {
-    fetch(input?: Request | string, init?: RequestInit): Promise<Response>;
-}
-
-interface HTMLAllCollection {
-    readonly length: number;
-    item(nameOrIndex?: string): HTMLCollection | Element | null;
-    namedItem(name: string): HTMLCollection | Element | null;
-    [index: number]: Element;
-}
-
-declare var HTMLAllCollection: {
-    prototype: HTMLAllCollection;
-    new(): HTMLAllCollection;
-};
-
-interface HTMLAnchorElement extends HTMLElement, HTMLHyperlinkElementUtils {
-    Methods: string;
-    /**
-     * Sets or retrieves the character set used to encode the object.
-     */
-    /** @deprecated */
-    charset: string;
-    /**
-     * Sets or retrieves the coordinates of the object.
-     */
-    /** @deprecated */
-    coords: string;
-    download: string;
-    /**
-     * Sets or retrieves the language code of the object.
-     */
-    hreflang: string;
-    readonly mimeType: string;
-    /**
-     * Sets or retrieves the shape of the object.
-     */
-    /** @deprecated */
-    name: string;
-    readonly nameProp: string;
-    readonly protocolLong: string;
-    /**
-     * Sets or retrieves the relationship between the object and the destination of the link.
-     */
-    rel: string;
-    /**
-     * Sets or retrieves the relationship between the object and the destination of the link.
-     */
-    /** @deprecated */
-    rev: string;
-    /**
-     * Sets or retrieves the shape of the object.
-     */
-    /** @deprecated */
-    shape: string;
-    /**
-     * Sets or retrieves the window or frame at which to target content.
-     */
-    target: string;
-    /**
-     * Retrieves or sets the text of the object as a string.
-     */
-    text: string;
-    type: string;
-    urn: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLAnchorElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLAnchorElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLAnchorElement: {
-    prototype: HTMLAnchorElement;
-    new(): HTMLAnchorElement;
-};
-
-interface HTMLAppletElement extends HTMLElement {
-    /** @deprecated */
-    align: string;
-    /**
-     * Sets or retrieves a text alternative to the graphic.
-     */
-    /** @deprecated */
-    alt: string;
-    /**
-     * Sets or retrieves a character string that can be used to implement your own archive functionality for the object.
-     */
-    /** @deprecated */
-    archive: string;
-    /** @deprecated */
-    code: string;
-    /**
-     * Sets or retrieves the URL of the component.
-     */
-    /** @deprecated */
-    codeBase: string;
-    readonly form: HTMLFormElement | null;
-    /**
-     * Sets or retrieves the height of the object.
-     */
-    /** @deprecated */
-    height: string;
-    /** @deprecated */
-    hspace: number;
-    /**
-     * Sets or retrieves the shape of the object.
-     */
-    /** @deprecated */
-    name: string;
-    /** @deprecated */
-    object: string;
-    /** @deprecated */
-    vspace: number;
-    /** @deprecated */
-    width: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLAppletElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLAppletElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLAppletElement: {
-    prototype: HTMLAppletElement;
-    new(): HTMLAppletElement;
-};
-
-interface HTMLAreaElement extends HTMLElement, HTMLHyperlinkElementUtils {
-    /**
-     * Sets or retrieves a text alternative to the graphic.
-     */
-    alt: string;
-    /**
-     * Sets or retrieves the coordinates of the object.
-     */
-    coords: string;
-    download: string;
-    /**
-     * Sets or gets whether clicks in this region cause action.
-     */
-    /** @deprecated */
-    noHref: boolean;
-    rel: string;
-    /**
-     * Sets or retrieves the shape of the object.
-     */
-    shape: string;
-    /**
-     * Sets or retrieves the window or frame at which to target content.
-     */
-    target: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLAreaElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLAreaElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLAreaElement: {
-    prototype: HTMLAreaElement;
-    new(): HTMLAreaElement;
-};
-
-interface HTMLAreasCollection extends HTMLCollectionBase {
-}
-
-declare var HTMLAreasCollection: {
-    prototype: HTMLAreasCollection;
-    new(): HTMLAreasCollection;
-};
-
-interface HTMLAudioElement extends HTMLMediaElement {
-    addEventListener<K extends keyof HTMLMediaElementEventMap>(type: K, listener: (this: HTMLAudioElement, ev: HTMLMediaElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLMediaElementEventMap>(type: K, listener: (this: HTMLAudioElement, ev: HTMLMediaElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLAudioElement: {
-    prototype: HTMLAudioElement;
-    new(): HTMLAudioElement;
-};
-
-interface HTMLBRElement extends HTMLElement {
-    /**
-     * Sets or retrieves the side on which floating objects are not to be positioned when any IHTMLBlockElement is inserted into the document.
-     */
-    /** @deprecated */
-    clear: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLBRElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLBRElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLBRElement: {
-    prototype: HTMLBRElement;
-    new(): HTMLBRElement;
-};
-
-interface HTMLBaseElement extends HTMLElement {
-    /**
-     * Gets or sets the baseline URL on which relative links are based.
-     */
-    href: string;
-    /**
-     * Sets or retrieves the window or frame at which to target content.
-     */
-    target: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLBaseElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLBaseElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLBaseElement: {
-    prototype: HTMLBaseElement;
-    new(): HTMLBaseElement;
-};
-
-interface HTMLBaseFontElement extends HTMLElement, DOML2DeprecatedColorProperty {
-    /**
-     * Sets or retrieves the current typeface family.
-     */
-    /** @deprecated */
-    face: string;
-    /**
-     * Sets or retrieves the font size of the object.
-     */
-    /** @deprecated */
-    size: number;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLBaseFontElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLBaseFontElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLBaseFontElement: {
-    prototype: HTMLBaseFontElement;
-    new(): HTMLBaseFontElement;
-};
-
-interface HTMLBodyElementEventMap extends HTMLElementEventMap, WindowEventHandlersEventMap {
-    "blur": FocusEvent;
-    "error": ErrorEvent;
-    "focus": FocusEvent;
-    "load": Event;
-    "orientationchange": Event;
-    "resize": UIEvent;
-    "scroll": UIEvent;
-}
-
-interface HTMLBodyElement extends HTMLElement, WindowEventHandlers {
-    /** @deprecated */
-    aLink: string;
-    /** @deprecated */
-    background: string;
-    /** @deprecated */
-    bgColor: string;
-    bgProperties: string;
-    /** @deprecated */
-    link: string;
-    /** @deprecated */
-    noWrap: boolean;
-    onorientationchange: ((this: HTMLBodyElement, ev: Event) => any) | null;
-    onresize: ((this: HTMLBodyElement, ev: UIEvent) => any) | null;
-    /** @deprecated */
-    text: string;
-    /** @deprecated */
-    vLink: string;
-    addEventListener<K extends keyof HTMLBodyElementEventMap>(type: K, listener: (this: HTMLBodyElement, ev: HTMLBodyElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLBodyElementEventMap>(type: K, listener: (this: HTMLBodyElement, ev: HTMLBodyElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLBodyElement: {
-    prototype: HTMLBodyElement;
-    new(): HTMLBodyElement;
-};
-
-interface HTMLButtonElement extends HTMLElement {
-    /**
-     * Provides a way to direct a user to a specific field when a document loads. This can provide both direction and convenience for a user, reducing the need to click or tab to a field when a page opens. This attribute is true when present on an element, and false when missing.
-     */
-    autofocus: boolean;
-    disabled: boolean;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Overrides the action attribute (where the data on a form is sent) on the parent form element.
-     */
-    formAction: string;
-    /**
-     * Used to override the encoding (formEnctype attribute) specified on the form element.
-     */
-    formEnctype: string;
-    /**
-     * Overrides the submit method attribute previously specified on a form element.
-     */
-    formMethod: string;
-    /**
-     * Overrides any validation or required attributes on a form or form elements to allow it to be submitted without validation. This can be used to create a "save draft"-type submit option.
-     */
-    formNoValidate: boolean;
-    /**
-     * Overrides the target attribute on a form element.
-     */
-    formTarget: string;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    name: string;
-    status: any;
-    /**
-     * Gets the classification and default behavior of the button.
-     */
-    type: string;
-    /**
-     * Returns the error message that would be displayed if the user submits the form, or an empty string if no error message. It also triggers the standard error message, such as "this is a required field". The result is that the user sees validation messages without actually submitting.
-     */
-    readonly validationMessage: string;
-    /**
-     * Returns a  ValidityState object that represents the validity states of an element.
-     */
-    readonly validity: ValidityState;
-    /**
-     * Sets or retrieves the default or selected value of the control.
-     */
-    value: string;
-    /**
-     * Returns whether an element will successfully validate based on forms validation rules and constraints.
-     */
-    readonly willValidate: boolean;
-    /**
-     * Returns whether a form will validate when it is submitted, without having to submit it.
-     */
-    checkValidity(): boolean;
-    /**
-     * Sets a custom error message that is displayed when a form is submitted.
-     * @param error Sets a custom error message that is displayed when a form is submitted.
-     */
-    setCustomValidity(error: string): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLButtonElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLButtonElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLButtonElement: {
-    prototype: HTMLButtonElement;
-    new(): HTMLButtonElement;
-};
-
-interface HTMLCanvasElement extends HTMLElement {
-    /**
-     * Gets or sets the height of a canvas element on a document.
-     */
-    height: number;
-    /**
-     * Gets or sets the width of a canvas element on a document.
-     */
-    width: number;
-    /**
-     * Returns an object that provides methods and properties for drawing and manipulating images and graphics on a canvas element in a document. A context object includes information about colors, line widths, fonts, and other graphic parameters that can be drawn on a canvas.
-     * @param contextId The identifier (ID) of the type of canvas to create. Internet Explorer 9 and Internet Explorer 10 support only a 2-D context using canvas.getContext("2d"); IE11 Preview also supports 3-D or WebGL context using canvas.getContext("experimental-webgl");
-     */
-    getContext(contextId: "2d", contextAttributes?: Canvas2DContextAttributes): CanvasRenderingContext2D | null;
-    getContext(contextId: "webgl" | "experimental-webgl", contextAttributes?: WebGLContextAttributes): WebGLRenderingContext | null;
-    getContext(contextId: string, contextAttributes?: {}): CanvasRenderingContext2D | WebGLRenderingContext | null;
-    /**
-     * Returns a blob object encoded as a Portable Network Graphics (PNG) format from a canvas image or drawing.
-     */
-    msToBlob(): Blob;
-    toBlob(callback: (result: Blob | null) => void, type?: string, ...arguments: any[]): void;
-    /**
-     * Returns the content of the current canvas as an image that you can use as a source for another canvas or an HTML element.
-     * @param type The standard MIME type for the image format to return. If you do not specify this parameter, the default value is a PNG format image.
-     */
-    toDataURL(type?: string, ...args: any[]): string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLCanvasElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLCanvasElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLCanvasElement: {
-    prototype: HTMLCanvasElement;
-    new(): HTMLCanvasElement;
-};
-
-interface HTMLCollectionBase {
-    /**
-     * Sets or retrieves the number of objects in a collection.
-     */
-    readonly length: number;
-    /**
-     * Retrieves an object from various collections.
-     */
-    item(index: number): Element;
-    [index: number]: Element;
-}
-
-interface HTMLCollection extends HTMLCollectionBase {
-    /**
-     * Retrieves a select object or an object from an options collection.
-     */
-    namedItem(name: string): Element | null;
-}
-
-declare var HTMLCollection: {
-    prototype: HTMLCollection;
-    new(): HTMLCollection;
-};
-
-interface HTMLCollectionOf<T extends Element> extends HTMLCollectionBase {
-    item(index: number): T;
-    namedItem(name: string): T;
-    [index: number]: T;
-}
-
-interface HTMLDListElement extends HTMLElement {
-    /** @deprecated */
-    compact: boolean;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDListElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDListElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLDListElement: {
-    prototype: HTMLDListElement;
-    new(): HTMLDListElement;
-};
-
-interface HTMLDataElement extends HTMLElement {
-    value: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDataElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDataElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLDataElement: {
-    prototype: HTMLDataElement;
-    new(): HTMLDataElement;
-};
-
-interface HTMLDataListElement extends HTMLElement {
-    readonly options: HTMLCollectionOf<HTMLOptionElement>;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDataListElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDataListElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLDataListElement: {
-    prototype: HTMLDataListElement;
-    new(): HTMLDataListElement;
-};
-
-interface HTMLDetailsElement extends HTMLElement {
-    open: boolean;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDetailsElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDetailsElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLDetailsElement: {
-    prototype: HTMLDetailsElement;
-    new(): HTMLDetailsElement;
-};
-
-interface HTMLDialogElement extends HTMLElement {
-    open: boolean;
-    returnValue: string;
-    close(returnValue?: string): void;
-    show(): void;
-    showModal(): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDialogElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDialogElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLDialogElement: {
-    prototype: HTMLDialogElement;
-    new(): HTMLDialogElement;
-};
-
-interface HTMLDirectoryElement extends HTMLElement {
-    compact: boolean;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDirectoryElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDirectoryElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLDirectoryElement: {
-    prototype: HTMLDirectoryElement;
-    new(): HTMLDirectoryElement;
-};
-
-interface HTMLDivElement extends HTMLElement {
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    /** @deprecated */
-    align: string;
-    /**
-     * Sets or retrieves whether the browser automatically performs wordwrap.
-     */
-    noWrap: boolean;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDivElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDivElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLDivElement: {
-    prototype: HTMLDivElement;
-    new(): HTMLDivElement;
-};
-
-interface HTMLDocument extends Document {
-    addEventListener<K extends keyof DocumentEventMap>(type: K, listener: (this: HTMLDocument, ev: DocumentEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof DocumentEventMap>(type: K, listener: (this: HTMLDocument, ev: DocumentEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLDocument: {
-    prototype: HTMLDocument;
-    new(): HTMLDocument;
-};
-
-interface HTMLElementEventMap extends ElementEventMap {
-    "abort": UIEvent;
-    "activate": Event;
-    "beforeactivate": Event;
-    "beforecopy": Event;
-    "beforecut": Event;
-    "beforedeactivate": Event;
-    "beforepaste": Event;
-    "blur": FocusEvent;
-    "canplay": Event;
-    "canplaythrough": Event;
-    "change": Event;
-    "click": MouseEvent;
-    "contextmenu": PointerEvent;
-    "copy": ClipboardEvent;
-    "cuechange": Event;
-    "cut": ClipboardEvent;
-    "dblclick": MouseEvent;
-    "deactivate": Event;
-    "drag": DragEvent;
-    "dragend": DragEvent;
-    "dragenter": DragEvent;
-    "dragleave": DragEvent;
-    "dragover": DragEvent;
-    "dragstart": DragEvent;
-    "drop": DragEvent;
-    "durationchange": Event;
-    "emptied": Event;
-    "ended": Event;
-    "error": ErrorEvent;
-    "focus": FocusEvent;
-    "input": Event;
-    "invalid": Event;
-    "keydown": KeyboardEvent;
-    "keypress": KeyboardEvent;
-    "keyup": KeyboardEvent;
-    "load": Event;
-    "loadeddata": Event;
-    "loadedmetadata": Event;
-    "loadstart": Event;
-    "mousedown": MouseEvent;
-    "mouseenter": MouseEvent;
-    "mouseleave": MouseEvent;
-    "mousemove": MouseEvent;
-    "mouseout": MouseEvent;
-    "mouseover": MouseEvent;
-    "mouseup": MouseEvent;
-    "mousewheel": WheelEvent;
-    "MSContentZoom": Event;
-    "MSManipulationStateChanged": Event;
-    "paste": ClipboardEvent;
-    "pause": Event;
-    "play": Event;
-    "playing": Event;
-    "progress": ProgressEvent;
-    "ratechange": Event;
-    "reset": Event;
-    "scroll": UIEvent;
-    "seeked": Event;
-    "seeking": Event;
-    "select": UIEvent;
-    "selectstart": Event;
-    "stalled": Event;
-    "submit": Event;
-    "suspend": Event;
-    "timeupdate": Event;
-    "volumechange": Event;
-    "waiting": Event;
-}
-
-interface HTMLElement extends Element, ElementCSSInlineStyle {
-    accessKey: string;
-    contentEditable: string;
-    readonly dataset: DOMStringMap;
-    dir: string;
-    draggable: boolean;
-    hidden: boolean;
-    hideFocus: boolean;
-    innerText: string;
-    readonly isContentEditable: boolean;
-    lang: string;
-    readonly offsetHeight: number;
-    readonly offsetLeft: number;
-    readonly offsetParent: Element;
-    readonly offsetTop: number;
-    readonly offsetWidth: number;
-    onabort: ((this: HTMLElement, ev: UIEvent) => any) | null;
-    onactivate: ((this: HTMLElement, ev: Event) => any) | null;
-    onbeforeactivate: ((this: HTMLElement, ev: Event) => any) | null;
-    onbeforecopy: ((this: HTMLElement, ev: Event) => any) | null;
-    onbeforecut: ((this: HTMLElement, ev: Event) => any) | null;
-    onbeforedeactivate: ((this: HTMLElement, ev: Event) => any) | null;
-    onbeforepaste: ((this: HTMLElement, ev: Event) => any) | null;
-    onblur: ((this: HTMLElement, ev: FocusEvent) => any) | null;
-    oncanplay: ((this: HTMLElement, ev: Event) => any) | null;
-    oncanplaythrough: ((this: HTMLElement, ev: Event) => any) | null;
-    onchange: ((this: HTMLElement, ev: Event) => any) | null;
-    onclick: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    oncontextmenu: ((this: HTMLElement, ev: PointerEvent) => any) | null;
-    oncopy: ((this: HTMLElement, ev: ClipboardEvent) => any) | null;
-    oncuechange: ((this: HTMLElement, ev: Event) => any) | null;
-    oncut: ((this: HTMLElement, ev: ClipboardEvent) => any) | null;
-    ondblclick: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    ondeactivate: ((this: HTMLElement, ev: Event) => any) | null;
-    ondrag: ((this: HTMLElement, ev: DragEvent) => any) | null;
-    ondragend: ((this: HTMLElement, ev: DragEvent) => any) | null;
-    ondragenter: ((this: HTMLElement, ev: DragEvent) => any) | null;
-    ondragleave: ((this: HTMLElement, ev: DragEvent) => any) | null;
-    ondragover: ((this: HTMLElement, ev: DragEvent) => any) | null;
-    ondragstart: ((this: HTMLElement, ev: DragEvent) => any) | null;
-    ondrop: ((this: HTMLElement, ev: DragEvent) => any) | null;
-    ondurationchange: ((this: HTMLElement, ev: Event) => any) | null;
-    onemptied: ((this: HTMLElement, ev: Event) => any) | null;
-    onended: ((this: HTMLElement, ev: Event) => any) | null;
-    onerror: ((this: HTMLElement, ev: ErrorEvent) => any) | null;
-    onfocus: ((this: HTMLElement, ev: FocusEvent) => any) | null;
-    oninput: ((this: HTMLElement, ev: Event) => any) | null;
-    oninvalid: ((this: HTMLElement, ev: Event) => any) | null;
-    onkeydown: ((this: HTMLElement, ev: KeyboardEvent) => any) | null;
-    onkeypress: ((this: HTMLElement, ev: KeyboardEvent) => any) | null;
-    onkeyup: ((this: HTMLElement, ev: KeyboardEvent) => any) | null;
-    onload: ((this: HTMLElement, ev: Event) => any) | null;
-    onloadeddata: ((this: HTMLElement, ev: Event) => any) | null;
-    onloadedmetadata: ((this: HTMLElement, ev: Event) => any) | null;
-    onloadstart: ((this: HTMLElement, ev: Event) => any) | null;
-    onmousedown: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    onmouseenter: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    onmouseleave: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    onmousemove: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    onmouseout: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    onmouseover: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    onmouseup: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    onmousewheel: ((this: HTMLElement, ev: WheelEvent) => any) | null;
-    onmscontentzoom: ((this: HTMLElement, ev: Event) => any) | null;
-    onmsmanipulationstatechanged: ((this: HTMLElement, ev: Event) => any) | null;
-    onpaste: ((this: HTMLElement, ev: ClipboardEvent) => any) | null;
-    onpause: ((this: HTMLElement, ev: Event) => any) | null;
-    onplay: ((this: HTMLElement, ev: Event) => any) | null;
-    onplaying: ((this: HTMLElement, ev: Event) => any) | null;
-    onprogress: ((this: HTMLElement, ev: ProgressEvent) => any) | null;
-    onratechange: ((this: HTMLElement, ev: Event) => any) | null;
-    onreset: ((this: HTMLElement, ev: Event) => any) | null;
-    onscroll: ((this: HTMLElement, ev: UIEvent) => any) | null;
-    onseeked: ((this: HTMLElement, ev: Event) => any) | null;
-    onseeking: ((this: HTMLElement, ev: Event) => any) | null;
-    onselect: ((this: HTMLElement, ev: UIEvent) => any) | null;
-    onselectstart: ((this: HTMLElement, ev: Event) => any) | null;
-    onstalled: ((this: HTMLElement, ev: Event) => any) | null;
-    onsubmit: ((this: HTMLElement, ev: Event) => any) | null;
-    onsuspend: ((this: HTMLElement, ev: Event) => any) | null;
-    ontimeupdate: ((this: HTMLElement, ev: Event) => any) | null;
-    onvolumechange: ((this: HTMLElement, ev: Event) => any) | null;
-    onwaiting: ((this: HTMLElement, ev: Event) => any) | null;
-    outerText: string;
-    spellcheck: boolean;
-    tabIndex: number;
-    title: string;
-    animate(keyframes: AnimationKeyFrame | AnimationKeyFrame[], options: number | AnimationOptions): Animation;
-    blur(): void;
-    click(): void;
-    dragDrop(): boolean;
-    focus(): void;
-    msGetInputContext(): MSInputMethodContext;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLElement: {
-    prototype: HTMLElement;
-    new(): HTMLElement;
-};
-
-interface HTMLEmbedElement extends HTMLElement, GetSVGDocument {
-    /**
-     * Sets or retrieves the height of the object.
-     */
-    height: string;
-    hidden: any;
-    /**
-     * Gets or sets whether the DLNA PlayTo device is available.
-     */
-    msPlayToDisabled: boolean;
-    /**
-     * Gets or sets the path to the preferred media source. This enables the Play To target device to stream the media content, which can be DRM protected, from a different location, such as a cloud media server.
-     */
-    msPlayToPreferredSourceUri: string;
-    /**
-     * Gets or sets the primary DLNA PlayTo device.
-     */
-    msPlayToPrimary: boolean;
-    /**
-     * Gets the source associated with the media element for use by the PlayToManager.
-     */
-    readonly msPlayToSource: any;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    /** @deprecated */
-    name: string;
-    /**
-     * Retrieves the palette used for the embedded document.
-     */
-    readonly palette: string;
-    /**
-     * Retrieves the URL of the plug-in used to view an embedded document.
-     */
-    readonly pluginspage: string;
-    readonly readyState: string;
-    /**
-     * Sets or retrieves a URL to be loaded by the object.
-     */
-    src: string;
-    /**
-     * Sets or retrieves the height and width units of the embed object.
-     */
-    units: string;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    width: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLEmbedElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLEmbedElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLEmbedElement: {
-    prototype: HTMLEmbedElement;
-    new(): HTMLEmbedElement;
-};
-
-interface HTMLFieldSetElement extends HTMLElement {
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    align: string;
-    disabled: boolean;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    name: string;
-    /**
-     * Returns the error message that would be displayed if the user submits the form, or an empty string if no error message. It also triggers the standard error message, such as "this is a required field". The result is that the user sees validation messages without actually submitting.
-     */
-    readonly validationMessage: string;
-    /**
-     * Returns a  ValidityState object that represents the validity states of an element.
-     */
-    readonly validity: ValidityState;
-    /**
-     * Returns whether an element will successfully validate based on forms validation rules and constraints.
-     */
-    readonly willValidate: boolean;
-    /**
-     * Returns whether a form will validate when it is submitted, without having to submit it.
-     */
-    checkValidity(): boolean;
-    /**
-     * Sets a custom error message that is displayed when a form is submitted.
-     * @param error Sets a custom error message that is displayed when a form is submitted.
-     */
-    setCustomValidity(error: string): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLFieldSetElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLFieldSetElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLFieldSetElement: {
-    prototype: HTMLFieldSetElement;
-    new(): HTMLFieldSetElement;
-};
-
-interface HTMLFontElement extends HTMLElement, DOML2DeprecatedColorProperty, DOML2DeprecatedSizeProperty {
-    /**
-     * Sets or retrieves the current typeface family.
-     */
-    /** @deprecated */
-    face: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLFontElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLFontElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLFontElement: {
-    prototype: HTMLFontElement;
-    new(): HTMLFontElement;
-};
-
-interface HTMLFormControlsCollection extends HTMLCollectionBase {
-    namedItem(name: string): HTMLCollection | Element | null;
-}
-
-declare var HTMLFormControlsCollection: {
-    prototype: HTMLFormControlsCollection;
-    new(): HTMLFormControlsCollection;
-};
-
-interface HTMLFormElement extends HTMLElement {
-    /**
-     * Sets or retrieves a list of character encodings for input data that must be accepted by the server processing the form.
-     */
-    acceptCharset: string;
-    /**
-     * Sets or retrieves the URL to which the form content is sent for processing.
-     */
-    action: string;
-    /**
-     * Specifies whether autocomplete is applied to an editable text field.
-     */
-    autocomplete: string;
-    /**
-     * Retrieves a collection, in source order, of all controls in a given form.
-     */
-    readonly elements: HTMLFormControlsCollection;
-    /**
-     * Sets or retrieves the MIME encoding for the form.
-     */
-    encoding: string;
-    /**
-     * Sets or retrieves the encoding type for the form.
-     */
-    enctype: string;
-    /**
-     * Sets or retrieves the number of objects in a collection.
-     */
-    readonly length: number;
-    /**
-     * Sets or retrieves how to send the form data to the server.
-     */
-    method: string;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    name: string;
-    /**
-     * Designates a form that is not validated when submitted.
-     */
-    noValidate: boolean;
-    /**
-     * Sets or retrieves the window or frame at which to target content.
-     */
-    target: string;
-    /**
-     * Returns whether a form will validate when it is submitted, without having to submit it.
-     */
-    checkValidity(): boolean;
-    /**
-     * Retrieves a form object or an object from an elements collection.
-     * @param name Variant of type Number or String that specifies the object or collection to retrieve. If this parameter is a Number, it is the zero-based index of the object. If this parameter is a string, all objects with matching name or id properties are retrieved, and a collection is returned if more than one match is made.
-     * @param index Variant of type Number that specifies the zero-based index of the object to retrieve when a collection is returned.
-     */
-    item(name?: any, index?: any): any;
-    /**
-     * Retrieves a form object or an object from an elements collection.
-     */
-    namedItem(name: string): any;
-    reportValidity(): boolean;
-    /**
-     * Fires when the user resets a form.
-     */
-    reset(): void;
-    /**
-     * Fires when a FORM is about to be submitted.
-     */
-    submit(): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLFormElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLFormElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-    [name: string]: any;
-}
-
-declare var HTMLFormElement: {
-    prototype: HTMLFormElement;
-    new(): HTMLFormElement;
-};
-
-interface HTMLFrameElementEventMap extends HTMLElementEventMap {
-    "load": Event;
-}
-
-interface HTMLFrameElement extends HTMLElement, GetSVGDocument {
-    /**
-     * Specifies the properties of a border drawn around an object.
-     */
-    border: string;
-    /**
-     * Sets or retrieves the border color of the object.
-     */
-    borderColor: any;
-    /**
-     * Retrieves the document object of the page or frame.
-     */
-    /** @deprecated */
-    readonly contentDocument: Document | null;
-    /**
-     * Retrieves the object of the specified.
-     */
-    /** @deprecated */
-    readonly contentWindow: Window | null;
-    /**
-     * Sets or retrieves whether to display a border for the frame.
-     */
-    /** @deprecated */
-    frameBorder: string;
-    /**
-     * Sets or retrieves the amount of additional space between the frames.
-     */
-    frameSpacing: any;
-    /**
-     * Sets or retrieves the height of the object.
-     */
-    height: string | number;
-    /**
-     * Sets or retrieves a URI to a long description of the object.
-     */
-    /** @deprecated */
-    longDesc: string;
-    /**
-     * Sets or retrieves the top and bottom margin heights before displaying the text in a frame.
-     */
-    /** @deprecated */
-    marginHeight: string;
-    /**
-     * Sets or retrieves the left and right margin widths before displaying the text in a frame.
-     */
-    /** @deprecated */
-    marginWidth: string;
-    /**
-     * Sets or retrieves the frame name.
-     */
-    /** @deprecated */
-    name: string;
-    /**
-     * Sets or retrieves whether the user can resize the frame.
-     */
-    /** @deprecated */
-    noResize: boolean;
-    /**
-     * Sets or retrieves whether the frame can be scrolled.
-     */
-    /** @deprecated */
-    scrolling: string;
-    /**
-     * Sets or retrieves a URL to be loaded by the object.
-     */
-    /** @deprecated */
-    src: string;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    width: string | number;
-    addEventListener<K extends keyof HTMLFrameElementEventMap>(type: K, listener: (this: HTMLFrameElement, ev: HTMLFrameElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLFrameElementEventMap>(type: K, listener: (this: HTMLFrameElement, ev: HTMLFrameElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLFrameElement: {
-    prototype: HTMLFrameElement;
-    new(): HTMLFrameElement;
-};
-
-interface HTMLFrameSetElementEventMap extends HTMLElementEventMap, WindowEventHandlersEventMap {
-    "blur": FocusEvent;
-    "error": ErrorEvent;
-    "focus": FocusEvent;
-    "load": Event;
-    "orientationchange": Event;
-    "resize": UIEvent;
-    "scroll": UIEvent;
-}
-
-interface HTMLFrameSetElement extends HTMLElement, WindowEventHandlers {
-    /**
-     * Sets or retrieves the frame widths of the object.
-     */
-    /** @deprecated */
-    cols: string;
-    name: string;
-    onorientationchange: ((this: HTMLFrameSetElement, ev: Event) => any) | null;
-    onresize: ((this: HTMLFrameSetElement, ev: UIEvent) => any) | null;
-    /**
-     * Sets or retrieves the frame heights of the object.
-     */
-    /** @deprecated */
-    rows: string;
-    addEventListener<K extends keyof HTMLFrameSetElementEventMap>(type: K, listener: (this: HTMLFrameSetElement, ev: HTMLFrameSetElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLFrameSetElementEventMap>(type: K, listener: (this: HTMLFrameSetElement, ev: HTMLFrameSetElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLFrameSetElement: {
-    prototype: HTMLFrameSetElement;
-    new(): HTMLFrameSetElement;
-};
-
-interface HTMLHRElement extends HTMLElement, DOML2DeprecatedColorProperty, DOML2DeprecatedSizeProperty {
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    /** @deprecated */
-    align: string;
-    /**
-     * Sets or retrieves whether the horizontal rule is drawn with 3-D shading.
-     */
-    /** @deprecated */
-    noShade: boolean;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    /** @deprecated */
-    width: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLHRElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLHRElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLHRElement: {
-    prototype: HTMLHRElement;
-    new(): HTMLHRElement;
-};
-
-interface HTMLHeadElement extends HTMLElement {
-    /** @deprecated */
-    profile: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLHeadElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLHeadElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLHeadElement: {
-    prototype: HTMLHeadElement;
-    new(): HTMLHeadElement;
-};
-
-interface HTMLHeadingElement extends HTMLElement {
-    /**
-     * Sets or retrieves a value that indicates the table alignment.
-     */
-    /** @deprecated */
-    align: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLHeadingElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLHeadingElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLHeadingElement: {
-    prototype: HTMLHeadingElement;
-    new(): HTMLHeadingElement;
-};
-
-interface HTMLHtmlElement extends HTMLElement {
-    /**
-     * Sets or retrieves the DTD version that governs the current document.
-     */
-    /** @deprecated */
-    version: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLHtmlElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLHtmlElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLHtmlElement: {
-    prototype: HTMLHtmlElement;
-    new(): HTMLHtmlElement;
-};
-
-interface HTMLHyperlinkElementUtils {
-    hash: string;
-    host: string;
-    hostname: string;
-    href: string;
-    origin: string;
-    pathname: string;
-    port: string;
-    protocol: string;
-    search: string;
-    toString(): string;
-}
-
-interface HTMLIFrameElementEventMap extends HTMLElementEventMap {
-    "load": Event;
-}
-
-interface HTMLIFrameElement extends HTMLElement, GetSVGDocument {
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    /** @deprecated */
-    align: string;
-    allowFullscreen: boolean;
-    allowPaymentRequest: boolean;
-    /**
-     * Retrieves the document object of the page or frame.
-     */
-    readonly contentDocument: Document | null;
-    /**
-     * Retrieves the object of the specified.
-     */
-    readonly contentWindow: Window | null;
-    /**
-     * Sets or retrieves whether to display a border for the frame.
-     */
-    /** @deprecated */
-    frameBorder: string;
-    /**
-     * Sets or retrieves the height of the object.
-     */
-    height: string;
-    /**
-     * Sets or retrieves a URI to a long description of the object.
-     */
-    /** @deprecated */
-    longDesc: string;
-    /**
-     * Sets or retrieves the top and bottom margin heights before displaying the text in a frame.
-     */
-    /** @deprecated */
-    marginHeight: string;
-    /**
-     * Sets or retrieves the left and right margin widths before displaying the text in a frame.
-     */
-    /** @deprecated */
-    marginWidth: string;
-    /**
-     * Sets or retrieves the frame name.
-     */
-    name: string;
-    readonly sandbox: DOMTokenList;
-    /**
-     * Sets or retrieves whether the frame can be scrolled.
-     */
-    /** @deprecated */
-    scrolling: string;
-    /**
-     * Sets or retrieves a URL to be loaded by the object.
-     */
-    src: string;
-    /**
-     * Sets or retrives the content of the page that is to contain.
-     */
-    srcdoc: string;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    width: string;
-    addEventListener<K extends keyof HTMLIFrameElementEventMap>(type: K, listener: (this: HTMLIFrameElement, ev: HTMLIFrameElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLIFrameElementEventMap>(type: K, listener: (this: HTMLIFrameElement, ev: HTMLIFrameElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLIFrameElement: {
-    prototype: HTMLIFrameElement;
-    new(): HTMLIFrameElement;
-};
-
-interface HTMLImageElement extends HTMLElement {
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    /** @deprecated */
-    align: string;
-    /**
-     * Sets or retrieves a text alternative to the graphic.
-     */
-    alt: string;
-    /**
-     * Specifies the properties of a border drawn around an object.
-     */
-    /** @deprecated */
-    border: string;
-    /**
-     * Retrieves whether the object is fully loaded.
-     */
-    readonly complete: boolean;
-    crossOrigin: string | null;
-    readonly currentSrc: string;
-    decoding: "async" | "sync" | "auto";
-    /**
-     * Sets or retrieves the height of the object.
-     */
-    height: number;
-    /**
-     * Sets or retrieves the width of the border to draw around the object.
-     */
-    /** @deprecated */
-    hspace: number;
-    /**
-     * Sets or retrieves whether the image is a server-side image map.
-     */
-    isMap: boolean;
-    /**
-     * Sets or retrieves a Uniform Resource Identifier (URI) to a long description of the object.
-     */
-    longDesc: string;
-    /** @deprecated */
-    lowsrc: string;
-    /**
-     * Gets or sets whether the DLNA PlayTo device is available.
-     */
-    msPlayToDisabled: boolean;
-    msPlayToPreferredSourceUri: string;
-    /**
-     * Gets or sets the primary DLNA PlayTo device.
-     */
-    msPlayToPrimary: boolean;
-    /**
-     * Gets the source associated with the media element for use by the PlayToManager.
-     */
-    readonly msPlayToSource: any;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    /** @deprecated */
-    name: string;
-    /**
-     * The original height of the image resource before sizing.
-     */
-    readonly naturalHeight: number;
-    /**
-     * The original width of the image resource before sizing.
-     */
-    readonly naturalWidth: number;
-    sizes: string;
-    /**
-     * The address or URL of the a media resource that is to be considered.
-     */
-    src: string;
-    srcset: string;
-    /**
-     * Sets or retrieves the URL, often with a bookmark extension (#name), to use as a client-side image map.
-     */
-    useMap: string;
-    /**
-     * Sets or retrieves the vertical margin for the object.
-     */
-    /** @deprecated */
-    vspace: number;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    width: number;
-    readonly x: number;
-    readonly y: number;
-    msGetAsCastingSource(): any;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLImageElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLImageElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLImageElement: {
-    prototype: HTMLImageElement;
-    new(): HTMLImageElement;
-};
-
-interface HTMLInputElement extends HTMLElement {
-    /**
-     * Sets or retrieves a comma-separated list of content types.
-     */
-    accept: string;
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    /** @deprecated */
-    align: string;
-    /**
-     * Sets or retrieves a text alternative to the graphic.
-     */
-    alt: string;
-    /**
-     * Specifies whether autocomplete is applied to an editable text field.
-     */
-    autocomplete: string;
-    /**
-     * Provides a way to direct a user to a specific field when a document loads. This can provide both direction and convenience for a user, reducing the need to click or tab to a field when a page opens. This attribute is true when present on an element, and false when missing.
-     */
-    autofocus: boolean;
-    /**
-     * Sets or retrieves the state of the check box or radio button.
-     */
-    checked: boolean;
-    /**
-     * Sets or retrieves the state of the check box or radio button.
-     */
-    defaultChecked: boolean;
-    /**
-     * Sets or retrieves the initial contents of the object.
-     */
-    defaultValue: string;
-    disabled: boolean;
-    /**
-     * Returns a FileList object on a file type input object.
-     */
-    files: FileList | null;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Overrides the action attribute (where the data on a form is sent) on the parent form element.
-     */
-    formAction: string;
-    /**
-     * Used to override the encoding (formEnctype attribute) specified on the form element.
-     */
-    formEnctype: string;
-    /**
-     * Overrides the submit method attribute previously specified on a form element.
-     */
-    formMethod: string;
-    /**
-     * Overrides any validation or required attributes on a form or form elements to allow it to be submitted without validation. This can be used to create a "save draft"-type submit option.
-     */
-    formNoValidate: boolean;
-    /**
-     * Overrides the target attribute on a form element.
-     */
-    formTarget: string;
-    /**
-     * Sets or retrieves the height of the object.
-     */
-    height: number;
-    indeterminate: boolean;
-    /**
-     * Specifies the ID of a pre-defined datalist of options for an input element.
-     */
-    readonly list: HTMLElement | null;
-    /**
-     * Defines the maximum acceptable value for an input element with type="number".When used with the min and step attributes, lets you control the range and increment (such as only even numbers) that the user can enter into an input field.
-     */
-    max: string;
-    /**
-     * Sets or retrieves the maximum number of characters that the user can enter in a text control.
-     */
-    maxLength: number;
-    /**
-     * Defines the minimum acceptable value for an input element with type="number". When used with the max and step attributes, lets you control the range and increment (such as even numbers only) that the user can enter into an input field.
-     */
-    min: string;
-    minLength: number;
-    /**
-     * Sets or retrieves the Boolean value indicating whether multiple items can be selected from a list.
-     */
-    multiple: boolean;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    name: string;
-    /**
-     * Gets or sets a string containing a regular expression that the user's input must match.
-     */
-    pattern: string;
-    /**
-     * Gets or sets a text string that is displayed in an input field as a hint or prompt to users as the format or type of information they need to enter.The text appears in an input field until the user puts focus on the field.
-     */
-    placeholder: string;
-    readOnly: boolean;
-    /**
-     * When present, marks an element that can't be submitted without a value.
-     */
-    required: boolean;
-    selectionDirection: string | null;
-    /**
-     * Gets or sets the end position or offset of a text selection.
-     */
-    selectionEnd: number | null;
-    /**
-     * Gets or sets the starting position or offset of a text selection.
-     */
-    selectionStart: number | null;
-    size: number;
-    /**
-     * The address or URL of the a media resource that is to be considered.
-     */
-    src: string;
-    /**
-     * Defines an increment or jump between values that you want to allow the user to enter. When used with the max and min attributes, lets you control the range and increment (for example, allow only even numbers) that the user can enter into an input field.
-     */
-    step: string;
-    /**
-     * Returns the content type of the object.
-     */
-    type: string;
-    /**
-     * Sets or retrieves the URL, often with a bookmark extension (#name), to use as a client-side image map.
-     */
-    /** @deprecated */
-    useMap: string;
-    /**
-     * Returns the error message that would be displayed if the user submits the form, or an empty string if no error message. It also triggers the standard error message, such as "this is a required field". The result is that the user sees validation messages without actually submitting.
-     */
-    readonly validationMessage: string;
-    /**
-     * Returns a  ValidityState object that represents the validity states of an element.
-     */
-    readonly validity: ValidityState;
-    /**
-     * Returns the value of the data at the cursor's current position.
-     */
-    value: string;
-    valueAsDate: any;
-    /**
-     * Returns the input field value as a number.
-     */
-    valueAsNumber: number;
-    webkitdirectory: boolean;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    width: number;
-    /**
-     * Returns whether an element will successfully validate based on forms validation rules and constraints.
-     */
-    readonly willValidate: boolean;
-    /**
-     * Returns whether a form will validate when it is submitted, without having to submit it.
-     */
-    checkValidity(): boolean;
-    /**
-     * Makes the selection equal to the current object.
-     */
-    select(): void;
-    /**
-     * Sets a custom error message that is displayed when a form is submitted.
-     * @param error Sets a custom error message that is displayed when a form is submitted.
-     */
-    setCustomValidity(error: string): void;
-    /**
-     * Sets the start and end positions of a selection in a text field.
-     * @param start The offset into the text field for the start of the selection.
-     * @param end The offset into the text field for the end of the selection.
-     * @param direction The direction in which the selection is performed.
-     */
-    setSelectionRange(start: number, end: number, direction?: "forward" | "backward" | "none"): void;
-    /**
-     * Decrements a range input control's value by the value given by the Step attribute. If the optional parameter is used, it will decrement the input control's step value multiplied by the parameter's value.
-     * @param n Value to decrement the value by.
-     */
-    stepDown(n?: number): void;
-    /**
-     * Increments a range input control's value by the value given by the Step attribute. If the optional parameter is used, will increment the input control's value by that value.
-     * @param n Value to increment the value by.
-     */
-    stepUp(n?: number): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLInputElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLInputElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLInputElement: {
-    prototype: HTMLInputElement;
-    new(): HTMLInputElement;
-};
-
-interface HTMLLIElement extends HTMLElement {
-    /** @deprecated */
-    type: string;
-    /**
-     * Sets or retrieves the value of a list item.
-     */
-    value: number;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLLIElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLLIElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLLIElement: {
-    prototype: HTMLLIElement;
-    new(): HTMLLIElement;
-};
-
-interface HTMLLabelElement extends HTMLElement {
-    readonly control: HTMLInputElement | null;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Sets or retrieves the object to which the given label object is assigned.
-     */
-    htmlFor: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLLabelElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLLabelElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLLabelElement: {
-    prototype: HTMLLabelElement;
-    new(): HTMLLabelElement;
-};
-
-interface HTMLLegendElement extends HTMLElement {
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    /** @deprecated */
-    align: string;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLLegendElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLLegendElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLLegendElement: {
-    prototype: HTMLLegendElement;
-    new(): HTMLLegendElement;
-};
-
-interface HTMLLinkElement extends HTMLElement, LinkStyle {
-    /**
-     * Sets or retrieves the character set used to encode the object.
-     */
-    /** @deprecated */
-    charset: string;
-    crossOrigin: string | null;
-    /** @deprecated */
-    disabled: boolean;
-    /**
-     * Sets or retrieves a destination URL or an anchor point.
-     */
-    href: string;
-    /**
-     * Sets or retrieves the language code of the object.
-     */
-    hreflang: string;
-    import?: Document;
-    integrity: string;
-    /**
-     * Sets or retrieves the media type.
-     */
-    media: string;
-    /**
-     * Sets or retrieves the relationship between the object and the destination of the link.
-     */
-    rel: string;
-    /**
-     * Sets or retrieves the relationship between the object and the destination of the link.
-     */
-    /** @deprecated */
-    rev: string;
-    /**
-     * Sets or retrieves the window or frame at which to target content.
-     */
-    /** @deprecated */
-    target: string;
-    /**
-     * Sets or retrieves the MIME type of the object.
-     */
-    type: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLLinkElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLLinkElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLLinkElement: {
-    prototype: HTMLLinkElement;
-    new(): HTMLLinkElement;
-};
-
-interface HTMLMainElement extends HTMLElement {
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMainElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMainElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLMainElement: {
-    prototype: HTMLMainElement;
-    new(): HTMLMainElement;
-};
-
-interface HTMLMapElement extends HTMLElement {
-    /**
-     * Retrieves a collection of the area objects defined for the given map object.
-     */
-    readonly areas: HTMLAreasCollection;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    name: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMapElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMapElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLMapElement: {
-    prototype: HTMLMapElement;
-    new(): HTMLMapElement;
-};
-
-interface HTMLMarqueeElementEventMap extends HTMLElementEventMap {
-    "bounce": Event;
-    "finish": Event;
-    "start": Event;
-}
-
-interface HTMLMarqueeElement extends HTMLElement {
-    /** @deprecated */
-    behavior: string;
-    /** @deprecated */
-    bgColor: string;
-    /** @deprecated */
-    direction: string;
-    /** @deprecated */
-    height: string;
-    /** @deprecated */
-    hspace: number;
-    /** @deprecated */
-    loop: number;
-    /** @deprecated */
-    onbounce: ((this: HTMLMarqueeElement, ev: Event) => any) | null;
-    /** @deprecated */
-    onfinish: ((this: HTMLMarqueeElement, ev: Event) => any) | null;
-    /** @deprecated */
-    onstart: ((this: HTMLMarqueeElement, ev: Event) => any) | null;
-    /** @deprecated */
-    scrollAmount: number;
-    /** @deprecated */
-    scrollDelay: number;
-    /** @deprecated */
-    trueSpeed: boolean;
-    /** @deprecated */
-    vspace: number;
-    /** @deprecated */
-    width: string;
-    /** @deprecated */
-    start(): void;
-    /** @deprecated */
-    stop(): void;
-    addEventListener<K extends keyof HTMLMarqueeElementEventMap>(type: K, listener: (this: HTMLMarqueeElement, ev: HTMLMarqueeElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLMarqueeElementEventMap>(type: K, listener: (this: HTMLMarqueeElement, ev: HTMLMarqueeElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLMarqueeElement: {
-    prototype: HTMLMarqueeElement;
-    new(): HTMLMarqueeElement;
-};
-
-interface HTMLMediaElementEventMap extends HTMLElementEventMap {
-    "encrypted": MediaEncryptedEvent;
-    "msneedkey": Event;
-}
-
-interface HTMLMediaElement extends HTMLElement {
-    /**
-     * Returns an AudioTrackList object with the audio tracks for a given video element.
-     */
-    readonly audioTracks: AudioTrackList;
-    /**
-     * Gets or sets a value that indicates whether to start playing the media automatically.
-     */
-    autoplay: boolean;
-    /**
-     * Gets a collection of buffered time ranges.
-     */
-    readonly buffered: TimeRanges;
-    /**
-     * Gets or sets a flag that indicates whether the client provides a set of controls for the media (in case the developer does not include controls for the player).
-     */
-    controls: boolean;
-    crossOrigin: string | null;
-    /**
-     * Gets the address or URL of the current media resource that is selected by IHTMLMediaElement.
-     */
-    readonly currentSrc: string;
-    /**
-     * Gets or sets the current playback position, in seconds.
-     */
-    currentTime: number;
-    defaultMuted: boolean;
-    /**
-     * Gets or sets the default playback rate when the user is not using fast forward or reverse for a video or audio resource.
-     */
-    defaultPlaybackRate: number;
-    /**
-     * Returns the duration in seconds of the current media resource. A NaN value is returned if duration is not available, or Infinity if the media resource is streaming.
-     */
-    readonly duration: number;
-    /**
-     * Gets information about whether the playback has ended or not.
-     */
-    readonly ended: boolean;
-    /**
-     * Returns an object representing the current error state of the audio or video element.
-     */
-    readonly error: MediaError | null;
-    /**
-     * Gets or sets a flag to specify whether playback should restart after it completes.
-     */
-    loop: boolean;
-    readonly mediaKeys: MediaKeys | null;
-    /**
-     * Specifies the purpose of the audio or video media, such as background audio or alerts.
-     */
-    msAudioCategory: string;
-    /**
-     * Specifies the output device id that the audio will be sent to.
-     */
-    msAudioDeviceType: string;
-    readonly msGraphicsTrustStatus: MSGraphicsTrust;
-    /**
-     * Gets the MSMediaKeys object, which is used for decrypting media data, that is associated with this media element.
-     */
-    /** @deprecated */
-    readonly msKeys: MSMediaKeys;
-    /**
-     * Gets or sets whether the DLNA PlayTo device is available.
-     */
-    msPlayToDisabled: boolean;
-    /**
-     * Gets or sets the path to the preferred media source. This enables the Play To target device to stream the media content, which can be DRM protected, from a different location, such as a cloud media server.
-     */
-    msPlayToPreferredSourceUri: string;
-    /**
-     * Gets or sets the primary DLNA PlayTo device.
-     */
-    msPlayToPrimary: boolean;
-    /**
-     * Gets the source associated with the media element for use by the PlayToManager.
-     */
-    readonly msPlayToSource: any;
-    /**
-     * Specifies whether or not to enable low-latency playback on the media element.
-     */
-    msRealTime: boolean;
-    /**
-     * Gets or sets a flag that indicates whether the audio (either audio or the audio track on video media) is muted.
-     */
-    muted: boolean;
-    /**
-     * Gets the current network activity for the element.
-     */
-    readonly networkState: number;
-    onencrypted: ((this: HTMLMediaElement, ev: MediaEncryptedEvent) => any) | null;
-    /** @deprecated */
-    onmsneedkey: ((this: HTMLMediaElement, ev: Event) => any) | null;
-    /**
-     * Gets a flag that specifies whether playback is paused.
-     */
-    readonly paused: boolean;
-    /**
-     * Gets or sets the current rate of speed for the media resource to play. This speed is expressed as a multiple of the normal speed of the media resource.
-     */
-    playbackRate: number;
-    /**
-     * Gets TimeRanges for the current media resource that has been played.
-     */
-    readonly played: TimeRanges;
-    /**
-     * Gets or sets the current playback position, in seconds.
-     */
-    preload: string;
-    readonly readyState: number;
-    /**
-     * Returns a TimeRanges object that represents the ranges of the current media resource that can be seeked.
-     */
-    readonly seekable: TimeRanges;
-    /**
-     * Gets a flag that indicates whether the the client is currently moving to a new playback position in the media resource.
-     */
-    readonly seeking: boolean;
-    /**
-     * The address or URL of the a media resource that is to be considered.
-     */
-    src: string;
-    srcObject: MediaStream | MediaSource | Blob | null;
-    readonly textTracks: TextTrackList;
-    readonly videoTracks: VideoTrackList;
-    /**
-     * Gets or sets the volume level for audio portions of the media element.
-     */
-    volume: number;
-    addTextTrack(kind: TextTrackKind, label?: string, language?: string): TextTrack;
-    /**
-     * Returns a string that specifies whether the client can play a given media resource type.
-     */
-    canPlayType(type: string): CanPlayTypeResult;
-    /**
-     * Resets the audio or video object and loads a new media resource.
-     */
-    load(): void;
-    /**
-     * Clears all effects from the media pipeline.
-     */
-    msClearEffects(): void;
-    msGetAsCastingSource(): any;
-    /**
-     * Inserts the specified audio effect into media pipeline.
-     */
-    msInsertAudioEffect(activatableClassId: string, effectRequired: boolean, config?: any): void;
-    /** @deprecated */
-    msSetMediaKeys(mediaKeys: MSMediaKeys): void;
-    /**
-     * Specifies the media protection manager for a given media pipeline.
-     */
-    msSetMediaProtectionManager(mediaProtectionManager?: any): void;
-    /**
-     * Pauses the current playback and sets paused to TRUE. This can be used to test whether the media is playing or paused. You can also use the pause or play events to tell whether the media is playing or not.
-     */
-    pause(): void;
-    /**
-     * Loads and starts playback of a media resource.
-     */
-    play(): Promise<void>;
-    setMediaKeys(mediaKeys: MediaKeys | null): Promise<void>;
-    readonly HAVE_CURRENT_DATA: number;
-    readonly HAVE_ENOUGH_DATA: number;
-    readonly HAVE_FUTURE_DATA: number;
-    readonly HAVE_METADATA: number;
-    readonly HAVE_NOTHING: number;
-    readonly NETWORK_EMPTY: number;
-    readonly NETWORK_IDLE: number;
-    readonly NETWORK_LOADING: number;
-    readonly NETWORK_NO_SOURCE: number;
-    addEventListener<K extends keyof HTMLMediaElementEventMap>(type: K, listener: (this: HTMLMediaElement, ev: HTMLMediaElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLMediaElementEventMap>(type: K, listener: (this: HTMLMediaElement, ev: HTMLMediaElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLMediaElement: {
-    prototype: HTMLMediaElement;
-    new(): HTMLMediaElement;
-    readonly HAVE_CURRENT_DATA: number;
-    readonly HAVE_ENOUGH_DATA: number;
-    readonly HAVE_FUTURE_DATA: number;
-    readonly HAVE_METADATA: number;
-    readonly HAVE_NOTHING: number;
-    readonly NETWORK_EMPTY: number;
-    readonly NETWORK_IDLE: number;
-    readonly NETWORK_LOADING: number;
-    readonly NETWORK_NO_SOURCE: number;
-};
-
-interface HTMLMenuElement extends HTMLElement {
-    /** @deprecated */
-    compact: boolean;
-    type: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMenuElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMenuElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLMenuElement: {
-    prototype: HTMLMenuElement;
-    new(): HTMLMenuElement;
-};
-
-interface HTMLMetaElement extends HTMLElement {
-    /**
-     * Sets or retrieves the character set used to encode the object.
-     */
-    /** @deprecated */
-    charset: string;
-    /**
-     * Gets or sets meta-information to associate with httpEquiv or name.
-     */
-    content: string;
-    /**
-     * Gets or sets information used to bind the value of a content attribute of a meta element to an HTTP response header.
-     */
-    httpEquiv: string;
-    /**
-     * Sets or retrieves the value specified in the content attribute of the meta object.
-     */
-    name: string;
-    /**
-     * Sets or retrieves a scheme to be used in interpreting the value of a property specified for the object.
-     */
-    /** @deprecated */
-    scheme: string;
-    /**
-     * Sets or retrieves the URL property that will be loaded after the specified time has elapsed.
-     */
-    /** @deprecated */
-    url: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMetaElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMetaElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLMetaElement: {
-    prototype: HTMLMetaElement;
-    new(): HTMLMetaElement;
-};
-
-interface HTMLMeterElement extends HTMLElement {
-    high: number;
-    low: number;
-    max: number;
-    min: number;
-    optimum: number;
-    value: number;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMeterElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMeterElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLMeterElement: {
-    prototype: HTMLMeterElement;
-    new(): HTMLMeterElement;
-};
-
-interface HTMLModElement extends HTMLElement {
-    /**
-     * Sets or retrieves reference information about the object.
-     */
-    cite: string;
-    /**
-     * Sets or retrieves the date and time of a modification to the object.
-     */
-    dateTime: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLModElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLModElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLModElement: {
-    prototype: HTMLModElement;
-    new(): HTMLModElement;
-};
-
-interface HTMLOListElement extends HTMLElement {
-    /** @deprecated */
-    compact: boolean;
-    /**
-     * The starting number.
-     */
-    start: number;
-    type: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLOListElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLOListElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLOListElement: {
-    prototype: HTMLOListElement;
-    new(): HTMLOListElement;
-};
-
-interface HTMLObjectElement extends HTMLElement, GetSVGDocument {
-    /**
-     * Retrieves a string of the URL where the object tag can be found. This is often the href of the document that the object is in, or the value set by a base element.
-     */
-    readonly BaseHref: string;
-    /** @deprecated */
-    align: string;
-    /**
-     * Sets or retrieves a character string that can be used to implement your own archive functionality for the object.
-     */
-    /** @deprecated */
-    archive: string;
-    /** @deprecated */
-    border: string;
-    /**
-     * Sets or retrieves the URL of the file containing the compiled Java class.
-     */
-    /** @deprecated */
-    code: string;
-    /**
-     * Sets or retrieves the URL of the component.
-     */
-    /** @deprecated */
-    codeBase: string;
-    /**
-     * Sets or retrieves the Internet media type for the code associated with the object.
-     */
-    /** @deprecated */
-    codeType: string;
-    /**
-     * Retrieves the document object of the page or frame.
-     */
-    readonly contentDocument: Document | null;
-    /**
-     * Sets or retrieves the URL that references the data of the object.
-     */
-    data: string;
-    /** @deprecated */
-    declare: boolean;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Sets or retrieves the height of the object.
-     */
-    height: string;
-    /** @deprecated */
-    hspace: number;
-    /**
-     * Gets or sets whether the DLNA PlayTo device is available.
-     */
-    msPlayToDisabled: boolean;
-    /**
-     * Gets or sets the path to the preferred media source. This enables the Play To target device to stream the media content, which can be DRM protected, from a different location, such as a cloud media server.
-     */
-    msPlayToPreferredSourceUri: string;
-    /**
-     * Gets or sets the primary DLNA PlayTo device.
-     */
-    msPlayToPrimary: boolean;
-    /**
-     * Gets the source associated with the media element for use by the PlayToManager.
-     */
-    readonly msPlayToSource: any;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    name: string;
-    readonly readyState: number;
-    /**
-     * Sets or retrieves a message to be displayed while an object is loading.
-     */
-    /** @deprecated */
-    standby: string;
-    /**
-     * Sets or retrieves the MIME type of the object.
-     */
-    type: string;
-    typemustmatch: boolean;
-    /**
-     * Sets or retrieves the URL, often with a bookmark extension (#name), to use as a client-side image map.
-     */
-    useMap: string;
-    /**
-     * Returns the error message that would be displayed if the user submits the form, or an empty string if no error message. It also triggers the standard error message, such as "this is a required field". The result is that the user sees validation messages without actually submitting.
-     */
-    readonly validationMessage: string;
-    /**
-     * Returns a  ValidityState object that represents the validity states of an element.
-     */
-    readonly validity: ValidityState;
-    /** @deprecated */
-    vspace: number;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    width: string;
-    /**
-     * Returns whether an element will successfully validate based on forms validation rules and constraints.
-     */
-    readonly willValidate: boolean;
-    /**
-     * Returns whether a form will validate when it is submitted, without having to submit it.
-     */
-    checkValidity(): boolean;
-    /**
-     * Sets a custom error message that is displayed when a form is submitted.
-     * @param error Sets a custom error message that is displayed when a form is submitted.
-     */
-    setCustomValidity(error: string): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLObjectElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLObjectElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLObjectElement: {
-    prototype: HTMLObjectElement;
-    new(): HTMLObjectElement;
-};
-
-interface HTMLOptGroupElement extends HTMLElement {
-    disabled: boolean;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Sets or retrieves a value that you can use to implement your own label functionality for the object.
-     */
-    label: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLOptGroupElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLOptGroupElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLOptGroupElement: {
-    prototype: HTMLOptGroupElement;
-    new(): HTMLOptGroupElement;
-};
-
-interface HTMLOptionElement extends HTMLElement {
-    /**
-     * Sets or retrieves the status of an option.
-     */
-    defaultSelected: boolean;
-    disabled: boolean;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Sets or retrieves the ordinal position of an option in a list box.
-     */
-    readonly index: number;
-    /**
-     * Sets or retrieves a value that you can use to implement your own label functionality for the object.
-     */
-    label: string;
-    /**
-     * Sets or retrieves whether the option in the list box is the default item.
-     */
-    selected: boolean;
-    /**
-     * Sets or retrieves the text string specified by the option tag.
-     */
-    text: string;
-    /**
-     * Sets or retrieves the value which is returned to the server when the form control is submitted.
-     */
-    value: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLOptionElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLOptionElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLOptionElement: {
-    prototype: HTMLOptionElement;
-    new(): HTMLOptionElement;
-};
-
-interface HTMLOptionsCollection extends HTMLCollectionOf<HTMLOptionElement> {
-    length: number;
-    selectedIndex: number;
-    add(element: HTMLOptionElement | HTMLOptGroupElement, before?: HTMLElement | number | null): void;
-    remove(index: number): void;
-}
-
-declare var HTMLOptionsCollection: {
-    prototype: HTMLOptionsCollection;
-    new(): HTMLOptionsCollection;
-};
-
-interface HTMLOutputElement extends HTMLElement {
-    defaultValue: string;
-    readonly form: HTMLFormElement | null;
-    readonly htmlFor: DOMTokenList;
-    name: string;
-    readonly type: string;
-    readonly validationMessage: string;
-    readonly validity: ValidityState;
-    value: string;
-    readonly willValidate: boolean;
-    checkValidity(): boolean;
-    reportValidity(): boolean;
-    setCustomValidity(error: string): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLOutputElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLOutputElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLOutputElement: {
-    prototype: HTMLOutputElement;
-    new(): HTMLOutputElement;
-};
-
-interface HTMLParagraphElement extends HTMLElement {
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    /** @deprecated */
-    align: string;
-    clear: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLParagraphElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLParagraphElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLParagraphElement: {
-    prototype: HTMLParagraphElement;
-    new(): HTMLParagraphElement;
-};
-
-interface HTMLParamElement extends HTMLElement {
-    /**
-     * Sets or retrieves the name of an input parameter for an element.
-     */
-    name: string;
-    /**
-     * Sets or retrieves the content type of the resource designated by the value attribute.
-     */
-    /** @deprecated */
-    type: string;
-    /**
-     * Sets or retrieves the value of an input parameter for an element.
-     */
-    value: string;
-    /**
-     * Sets or retrieves the data type of the value attribute.
-     */
-    /** @deprecated */
-    valueType: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLParamElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLParamElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLParamElement: {
-    prototype: HTMLParamElement;
-    new(): HTMLParamElement;
-};
-
-interface HTMLPictureElement extends HTMLElement {
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLPictureElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLPictureElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLPictureElement: {
-    prototype: HTMLPictureElement;
-    new(): HTMLPictureElement;
-};
-
-interface HTMLPreElement extends HTMLElement {
-    /**
-     * Sets or gets a value that you can use to implement your own width functionality for the object.
-     */
-    /** @deprecated */
-    width: number;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLPreElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLPreElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLPreElement: {
-    prototype: HTMLPreElement;
-    new(): HTMLPreElement;
-};
-
-interface HTMLProgressElement extends HTMLElement {
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Defines the maximum, or "done" value for a progress element.
-     */
-    max: number;
-    /**
-     * Returns the quotient of value/max when the value attribute is set (determinate progress bar), or -1 when the value attribute is missing (indeterminate progress bar).
-     */
-    readonly position: number;
-    /**
-     * Sets or gets the current value of a progress element. The value must be a non-negative number between 0 and the max value.
-     */
-    value: number;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLProgressElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLProgressElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLProgressElement: {
-    prototype: HTMLProgressElement;
-    new(): HTMLProgressElement;
-};
-
-interface HTMLQuoteElement extends HTMLElement {
-    /**
-     * Sets or retrieves reference information about the object.
-     */
-    cite: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLQuoteElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLQuoteElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLQuoteElement: {
-    prototype: HTMLQuoteElement;
-    new(): HTMLQuoteElement;
-};
-
-interface HTMLScriptElement extends HTMLElement {
-    async: boolean;
-    /**
-     * Sets or retrieves the character set used to encode the object.
-     */
-    charset: string;
-    crossOrigin: string | null;
-    /**
-     * Sets or retrieves the status of the script.
-     */
-    defer: boolean;
-    /**
-     * Sets or retrieves the event for which the script is written.
-     */
-    /** @deprecated */
-    event: string;
-    /**
-     * Sets or retrieves the object that is bound to the event script.
-     */
-    /** @deprecated */
-    htmlFor: string;
-    integrity: string;
-    noModule: boolean;
-    /**
-     * Retrieves the URL to an external file that contains the source code or data.
-     */
-    src: string;
-    /**
-     * Retrieves or sets the text of the object as a string.
-     */
-    text: string;
-    /**
-     * Sets or retrieves the MIME type for the associated scripting engine.
-     */
-    type: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLScriptElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLScriptElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLScriptElement: {
-    prototype: HTMLScriptElement;
-    new(): HTMLScriptElement;
-};
-
-interface HTMLSelectElement extends HTMLElement {
-    /**
-     * Provides a way to direct a user to a specific field when a document loads. This can provide both direction and convenience for a user, reducing the need to click or tab to a field when a page opens. This attribute is true when present on an element, and false when missing.
-     */
-    autofocus: boolean;
-    disabled: boolean;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Sets or retrieves the number of objects in a collection.
-     */
-    length: number;
-    /**
-     * Sets or retrieves the Boolean value indicating whether multiple items can be selected from a list.
-     */
-    multiple: boolean;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    name: string;
-    readonly options: HTMLOptionsCollection;
-    /**
-     * When present, marks an element that can't be submitted without a value.
-     */
-    required: boolean;
-    /**
-     * Sets or retrieves the index of the selected option in a select object.
-     */
-    selectedIndex: number;
-    readonly selectedOptions: HTMLCollectionOf<HTMLOptionElement>;
-    /**
-     * Sets or retrieves the number of rows in the list box.
-     */
-    size: number;
-    /**
-     * Retrieves the type of select control based on the value of the MULTIPLE attribute.
-     */
-    readonly type: string;
-    /**
-     * Returns the error message that would be displayed if the user submits the form, or an empty string if no error message. It also triggers the standard error message, such as "this is a required field". The result is that the user sees validation messages without actually submitting.
-     */
-    readonly validationMessage: string;
-    /**
-     * Returns a  ValidityState object that represents the validity states of an element.
-     */
-    readonly validity: ValidityState;
-    /**
-     * Sets or retrieves the value which is returned to the server when the form control is submitted.
-     */
-    value: string;
-    /**
-     * Returns whether an element will successfully validate based on forms validation rules and constraints.
-     */
-    readonly willValidate: boolean;
-    /**
-     * Adds an element to the areas, controlRange, or options collection.
-     * @param element Variant of type Number that specifies the index position in the collection where the element is placed. If no value is given, the method places the element at the end of the collection.
-     * @param before Variant of type Object that specifies an element to insert before, or null to append the object to the collection.
-     */
-    add(element: HTMLOptionElement | HTMLOptGroupElement, before?: HTMLElement | number | null): void;
-    /**
-     * Returns whether a form will validate when it is submitted, without having to submit it.
-     */
-    checkValidity(): boolean;
-    /**
-     * Retrieves a select object or an object from an options collection.
-     * @param name Variant of type Number or String that specifies the object or collection to retrieve. If this parameter is an integer, it is the zero-based index of the object. If this parameter is a string, all objects with matching name or id properties are retrieved, and a collection is returned if more than one match is made.
-     * @param index Variant of type Number that specifies the zero-based index of the object to retrieve when a collection is returned.
-     */
-    item(name?: any, index?: any): Element | null;
-    /**
-     * Retrieves a select object or an object from an options collection.
-     * @param namedItem A String that specifies the name or id property of the object to retrieve. A collection is returned if more than one match is made.
-     */
-    namedItem(name: string): any;
-    /**
-     * Removes an element from the collection.
-     * @param index Number that specifies the zero-based index of the element to remove from the collection.
-     */
-    remove(index?: number): void;
-    /**
-     * Sets a custom error message that is displayed when a form is submitted.
-     * @param error Sets a custom error message that is displayed when a form is submitted.
-     */
-    setCustomValidity(error: string): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSelectElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSelectElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-    [name: string]: any;
-}
-
-declare var HTMLSelectElement: {
-    prototype: HTMLSelectElement;
-    new(): HTMLSelectElement;
-};
-
-interface HTMLSlotElement extends HTMLElement {
-    name: string;
-    assignedNodes(options?: AssignedNodesOptions): Node[];
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSlotElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSlotElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-interface HTMLSourceElement extends HTMLElement {
-    /**
-     * Gets or sets the intended media type of the media source.
-     */
-    media: string;
-    /** @deprecated */
-    msKeySystem: string;
-    sizes: string;
-    /**
-     * The address or URL of the a media resource that is to be considered.
-     */
-    src: string;
-    srcset: string;
-    /**
-     * Gets or sets the MIME type of a media resource.
-     */
-    type: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSourceElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSourceElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLSourceElement: {
-    prototype: HTMLSourceElement;
-    new(): HTMLSourceElement;
-};
-
-interface HTMLSpanElement extends HTMLElement {
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSpanElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSpanElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLSpanElement: {
-    prototype: HTMLSpanElement;
-    new(): HTMLSpanElement;
-};
-
-interface HTMLStyleElement extends HTMLElement, LinkStyle {
-    /** @deprecated */
-    disabled: boolean;
-    /**
-     * Sets or retrieves the media type.
-     */
-    media: string;
-    /**
-     * Retrieves the CSS language in which the style sheet is written.
-     */
-    type: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLStyleElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLStyleElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLStyleElement: {
-    prototype: HTMLStyleElement;
-    new(): HTMLStyleElement;
-};
-
-interface HTMLSummaryElement extends HTMLElement {
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSummaryElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSummaryElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLSummaryElement: {
-    prototype: HTMLSummaryElement;
-    new(): HTMLSummaryElement;
-};
-
-interface HTMLTableCaptionElement extends HTMLElement {
-    /**
-     * Sets or retrieves the alignment of the caption or legend.
-     */
-    /** @deprecated */
-    align: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableCaptionElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableCaptionElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTableCaptionElement: {
-    prototype: HTMLTableCaptionElement;
-    new(): HTMLTableCaptionElement;
-};
-
-interface HTMLTableCellElement extends HTMLElement {
-    /**
-     * Sets or retrieves abbreviated text for the object.
-     */
-    abbr: string;
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    /** @deprecated */
-    align: string;
-    /**
-     * Sets or retrieves a comma-delimited list of conceptual categories associated with the object.
-     */
-    /** @deprecated */
-    axis: string;
-    /** @deprecated */
-    bgColor: string;
-    /**
-     * Retrieves the position of the object in the cells collection of a row.
-     */
-    readonly cellIndex: number;
-    /** @deprecated */
-    ch: string;
-    /** @deprecated */
-    chOff: string;
-    /**
-     * Sets or retrieves the number columns in the table that the object should span.
-     */
-    colSpan: number;
-    /**
-     * Sets or retrieves a list of header cells that provide information for the object.
-     */
-    headers: string;
-    /**
-     * Sets or retrieves the height of the object.
-     */
-    /** @deprecated */
-    height: string;
-    /**
-     * Sets or retrieves whether the browser automatically performs wordwrap.
-     */
-    /** @deprecated */
-    noWrap: boolean;
-    /**
-     * Sets or retrieves how many rows in a table the cell should span.
-     */
-    rowSpan: number;
-    /**
-     * Sets or retrieves the group of cells in a table to which the object's information applies.
-     */
-    scope: string;
-    /** @deprecated */
-    vAlign: string;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    /** @deprecated */
-    width: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableCellElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableCellElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTableCellElement: {
-    prototype: HTMLTableCellElement;
-    new(): HTMLTableCellElement;
-};
-
-interface HTMLTableColElement extends HTMLElement {
-    /**
-     * Sets or retrieves the alignment of the object relative to the display or table.
-     */
-    /** @deprecated */
-    align: string;
-    /** @deprecated */
-    ch: string;
-    /** @deprecated */
-    chOff: string;
-    /**
-     * Sets or retrieves the number of columns in the group.
-     */
-    span: number;
-    /** @deprecated */
-    vAlign: string;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    /** @deprecated */
-    width: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableColElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableColElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTableColElement: {
-    prototype: HTMLTableColElement;
-    new(): HTMLTableColElement;
-};
-
-interface HTMLTableDataCellElement extends HTMLTableCellElement {
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableDataCellElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableDataCellElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTableDataCellElement: {
-    prototype: HTMLTableDataCellElement;
-    new(): HTMLTableDataCellElement;
-};
-
-interface HTMLTableElement extends HTMLElement {
-    /**
-     * Sets or retrieves a value that indicates the table alignment.
-     */
-    /** @deprecated */
-    align: string;
-    /** @deprecated */
-    bgColor: string;
-    /**
-     * Sets or retrieves the width of the border to draw around the object.
-     */
-    /** @deprecated */
-    border: string;
-    /**
-     * Retrieves the caption object of a table.
-     */
-    caption: HTMLTableCaptionElement | null;
-    /**
-     * Sets or retrieves the amount of space between the border of the cell and the content of the cell.
-     */
-    /** @deprecated */
-    cellPadding: string;
-    /**
-     * Sets or retrieves the amount of space between cells in a table.
-     */
-    /** @deprecated */
-    cellSpacing: string;
-    /**
-     * Sets or retrieves the way the border frame around the table is displayed.
-     */
-    /** @deprecated */
-    frame: string;
-    /**
-     * Sets or retrieves the number of horizontal rows contained in the object.
-     */
-    readonly rows: HTMLCollectionOf<HTMLTableRowElement>;
-    /**
-     * Sets or retrieves which dividing lines (inner borders) are displayed.
-     */
-    /** @deprecated */
-    rules: string;
-    /**
-     * Sets or retrieves a description and/or structure of the object.
-     */
-    /** @deprecated */
-    summary: string;
-    /**
-     * Retrieves a collection of all tBody objects in the table. Objects in this collection are in source order.
-     */
-    readonly tBodies: HTMLCollectionOf<HTMLTableSectionElement>;
-    /**
-     * Retrieves the tFoot object of the table.
-     */
-    tFoot: HTMLTableSectionElement | null;
-    /**
-     * Retrieves the tHead object of the table.
-     */
-    tHead: HTMLTableSectionElement | null;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    /** @deprecated */
-    width: string;
-    /**
-     * Creates an empty caption element in the table.
-     */
-    createCaption(): HTMLTableCaptionElement;
-    /**
-     * Creates an empty tBody element in the table.
-     */
-    createTBody(): HTMLTableSectionElement;
-    /**
-     * Creates an empty tFoot element in the table.
-     */
-    createTFoot(): HTMLTableSectionElement;
-    /**
-     * Returns the tHead element object if successful, or null otherwise.
-     */
-    createTHead(): HTMLTableSectionElement;
-    /**
-     * Deletes the caption element and its contents from the table.
-     */
-    deleteCaption(): void;
-    /**
-     * Removes the specified row (tr) from the element and from the rows collection.
-     * @param index Number that specifies the zero-based position in the rows collection of the row to remove.
-     */
-    deleteRow(index?: number): void;
-    /**
-     * Deletes the tFoot element and its contents from the table.
-     */
-    deleteTFoot(): void;
-    /**
-     * Deletes the tHead element and its contents from the table.
-     */
-    deleteTHead(): void;
-    /**
-     * Creates a new row (tr) in the table, and adds the row to the rows collection.
-     * @param index Number that specifies where to insert the row in the rows collection. The default value is -1, which appends the new row to the end of the rows collection.
-     */
-    insertRow(index?: number): HTMLTableRowElement;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTableElement: {
-    prototype: HTMLTableElement;
-    new(): HTMLTableElement;
-};
-
-interface HTMLTableHeaderCellElement extends HTMLTableCellElement {
-    scope: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableHeaderCellElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableHeaderCellElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTableHeaderCellElement: {
-    prototype: HTMLTableHeaderCellElement;
-    new(): HTMLTableHeaderCellElement;
-};
-
-interface HTMLTableRowElement extends HTMLElement {
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    /** @deprecated */
-    align: string;
-    /** @deprecated */
-    bgColor: string;
-    /**
-     * Retrieves a collection of all cells in the table row.
-     */
-    readonly cells: HTMLCollectionOf<HTMLTableDataCellElement | HTMLTableHeaderCellElement>;
-    /** @deprecated */
-    ch: string;
-    /** @deprecated */
-    chOff: string;
-    /**
-     * Retrieves the position of the object in the rows collection for the table.
-     */
-    readonly rowIndex: number;
-    /**
-     * Retrieves the position of the object in the collection.
-     */
-    readonly sectionRowIndex: number;
-    /** @deprecated */
-    vAlign: string;
-    /**
-     * Removes the specified cell from the table row, as well as from the cells collection.
-     * @param index Number that specifies the zero-based position of the cell to remove from the table row. If no value is provided, the last cell in the cells collection is deleted.
-     */
-    deleteCell(index?: number): void;
-    /**
-     * Creates a new cell in the table row, and adds the cell to the cells collection.
-     * @param index Number that specifies where to insert the cell in the tr. The default value is -1, which appends the new cell to the end of the cells collection.
-     */
-    insertCell(index?: number): HTMLTableDataCellElement;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableRowElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableRowElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTableRowElement: {
-    prototype: HTMLTableRowElement;
-    new(): HTMLTableRowElement;
-};
-
-interface HTMLTableSectionElement extends HTMLElement {
-    /**
-     * Sets or retrieves a value that indicates the table alignment.
-     */
-    /** @deprecated */
-    align: string;
-    /** @deprecated */
-    ch: string;
-    /** @deprecated */
-    chOff: string;
-    /**
-     * Sets or retrieves the number of horizontal rows contained in the object.
-     */
-    readonly rows: HTMLCollectionOf<HTMLTableRowElement>;
-    /** @deprecated */
-    vAlign: string;
-    /**
-     * Removes the specified row (tr) from the element and from the rows collection.
-     * @param index Number that specifies the zero-based position in the rows collection of the row to remove.
-     */
-    deleteRow(index?: number): void;
-    /**
-     * Creates a new row (tr) in the table, and adds the row to the rows collection.
-     * @param index Number that specifies where to insert the row in the rows collection. The default value is -1, which appends the new row to the end of the rows collection.
-     */
-    insertRow(index?: number): HTMLTableRowElement;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableSectionElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableSectionElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTableSectionElement: {
-    prototype: HTMLTableSectionElement;
-    new(): HTMLTableSectionElement;
-};
-
-interface HTMLTemplateElement extends HTMLElement {
-    readonly content: DocumentFragment;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTemplateElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTemplateElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTemplateElement: {
-    prototype: HTMLTemplateElement;
-    new(): HTMLTemplateElement;
-};
-
-interface HTMLTextAreaElement extends HTMLElement {
-    /**
-     * Provides a way to direct a user to a specific field when a document loads. This can provide both direction and convenience for a user, reducing the need to click or tab to a field when a page opens. This attribute is true when present on an element, and false when missing.
-     */
-    autofocus: boolean;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    cols: number;
-    /**
-     * Sets or retrieves the initial contents of the object.
-     */
-    defaultValue: string;
-    disabled: boolean;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Sets or retrieves the maximum number of characters that the user can enter in a text control.
-     */
-    maxLength: number;
-    minLength: number;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    name: string;
-    /**
-     * Gets or sets a text string that is displayed in an input field as a hint or prompt to users as the format or type of information they need to enter.The text appears in an input field until the user puts focus on the field.
-     */
-    placeholder: string;
-    /**
-     * Sets or retrieves the value indicated whether the content of the object is read-only.
-     */
-    readOnly: boolean;
-    /**
-     * When present, marks an element that can't be submitted without a value.
-     */
-    required: boolean;
-    /**
-     * Sets or retrieves the number of horizontal rows contained in the object.
-     */
-    rows: number;
-    /**
-     * Gets or sets the end position or offset of a text selection.
-     */
-    selectionEnd: number;
-    /**
-     * Gets or sets the starting position or offset of a text selection.
-     */
-    selectionStart: number;
-    /**
-     * Retrieves the type of control.
-     */
-    readonly type: string;
-    /**
-     * Returns the error message that would be displayed if the user submits the form, or an empty string if no error message. It also triggers the standard error message, such as "this is a required field". The result is that the user sees validation messages without actually submitting.
-     */
-    readonly validationMessage: string;
-    /**
-     * Returns a  ValidityState object that represents the validity states of an element.
-     */
-    readonly validity: ValidityState;
-    /**
-     * Retrieves or sets the text in the entry field of the textArea element.
-     */
-    value: string;
-    /**
-     * Returns whether an element will successfully validate based on forms validation rules and constraints.
-     */
-    readonly willValidate: boolean;
-    /**
-     * Sets or retrieves how to handle wordwrapping in the object.
-     */
-    wrap: string;
-    /**
-     * Returns whether a form will validate when it is submitted, without having to submit it.
-     */
-    checkValidity(): boolean;
-    /**
-     * Highlights the input area of a form element.
-     */
-    select(): void;
-    /**
-     * Sets a custom error message that is displayed when a form is submitted.
-     * @param error Sets a custom error message that is displayed when a form is submitted.
-     */
-    setCustomValidity(error: string): void;
-    /**
-     * Sets the start and end positions of a selection in a text field.
-     * @param start The offset into the text field for the start of the selection.
-     * @param end The offset into the text field for the end of the selection.
-     * @param direction The direction in which the selection is performed.
-     */
-    setSelectionRange(start: number, end: number, direction?: "forward" | "backward" | "none"): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTextAreaElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTextAreaElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTextAreaElement: {
-    prototype: HTMLTextAreaElement;
-    new(): HTMLTextAreaElement;
-};
-
-interface HTMLTimeElement extends HTMLElement {
-    dateTime: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTimeElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTimeElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTimeElement: {
-    prototype: HTMLTimeElement;
-    new(): HTMLTimeElement;
-};
-
-interface HTMLTitleElement extends HTMLElement {
-    /**
-     * Retrieves or sets the text of the object as a string.
-     */
-    text: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTitleElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTitleElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTitleElement: {
-    prototype: HTMLTitleElement;
-    new(): HTMLTitleElement;
-};
-
-interface HTMLTrackElement extends HTMLElement {
-    default: boolean;
-    kind: string;
-    label: string;
-    readonly readyState: number;
-    src: string;
-    srclang: string;
-    readonly track: TextTrack;
-    readonly ERROR: number;
-    readonly LOADED: number;
-    readonly LOADING: number;
-    readonly NONE: number;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTrackElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTrackElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTrackElement: {
-    prototype: HTMLTrackElement;
-    new(): HTMLTrackElement;
-    readonly ERROR: number;
-    readonly LOADED: number;
-    readonly LOADING: number;
-    readonly NONE: number;
-};
-
-interface HTMLUListElement extends HTMLElement {
-    /** @deprecated */
-    compact: boolean;
-    /** @deprecated */
-    type: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLUListElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLUListElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLUListElement: {
-    prototype: HTMLUListElement;
-    new(): HTMLUListElement;
-};
-
-interface HTMLUnknownElement extends HTMLElement {
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLUnknownElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLUnknownElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLUnknownElement: {
-    prototype: HTMLUnknownElement;
-    new(): HTMLUnknownElement;
-};
-
-interface HTMLVideoElementEventMap extends HTMLMediaElementEventMap {
-    "MSVideoFormatChanged": Event;
-    "MSVideoFrameStepCompleted": Event;
-    "MSVideoOptimalLayoutChanged": Event;
-}
-
-interface HTMLVideoElement extends HTMLMediaElement {
-    /**
-     * Gets or sets the height of the video element.
-     */
-    height: number;
-    msHorizontalMirror: boolean;
-    readonly msIsLayoutOptimalForPlayback: boolean;
-    readonly msIsStereo3D: boolean;
-    msStereo3DPackingMode: string;
-    msStereo3DRenderMode: string;
-    msZoom: boolean;
-    onMSVideoFormatChanged: ((this: HTMLVideoElement, ev: Event) => any) | null;
-    onMSVideoFrameStepCompleted: ((this: HTMLVideoElement, ev: Event) => any) | null;
-    onMSVideoOptimalLayoutChanged: ((this: HTMLVideoElement, ev: Event) => any) | null;
-    /**
-     * Gets or sets a URL of an image to display, for example, like a movie poster. This can be a still frame from the video, or another image if no video data is available.
-     */
-    poster: string;
-    /**
-     * Gets the intrinsic height of a video in CSS pixels, or zero if the dimensions are not known.
-     */
-    readonly videoHeight: number;
-    /**
-     * Gets the intrinsic width of a video in CSS pixels, or zero if the dimensions are not known.
-     */
-    readonly videoWidth: number;
-    readonly webkitDisplayingFullscreen: boolean;
-    readonly webkitSupportsFullscreen: boolean;
-    /**
-     * Gets or sets the width of the video element.
-     */
-    width: number;
-    getVideoPlaybackQuality(): VideoPlaybackQuality;
-    msFrameStep(forward: boolean): void;
-    msInsertVideoEffect(activatableClassId: string, effectRequired: boolean, config?: any): void;
-    msSetVideoRectangle(left: number, top: number, right: number, bottom: number): void;
-    webkitEnterFullScreen(): void;
-    webkitEnterFullscreen(): void;
-    webkitExitFullScreen(): void;
-    webkitExitFullscreen(): void;
-    addEventListener<K extends keyof HTMLVideoElementEventMap>(type: K, listener: (this: HTMLVideoElement, ev: HTMLVideoElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLVideoElementEventMap>(type: K, listener: (this: HTMLVideoElement, ev: HTMLVideoElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLVideoElement: {
-    prototype: HTMLVideoElement;
-    new(): HTMLVideoElement;
-};
-
-interface HTMLegendElement {
-    readonly form: HTMLFormElement | null;
-}
-
-declare var HTMLegendElement: {
-    prototype: HTMLegendElement;
-    new(): HTMLegendElement;
-};
-
-interface HashChangeEvent extends Event {
-    readonly newURL: string;
-    readonly oldURL: string;
-}
-
-declare var HashChangeEvent: {
-    prototype: HashChangeEvent;
-    new(type: string, eventInitDict?: HashChangeEventInit): HashChangeEvent;
-};
-
-interface Headers {
-    append(name: string, value: string): void;
-    delete(name: string): void;
-    forEach(callback: Function, thisArg?: any): void;
-    get(name: string): string | null;
-    has(name: string): boolean;
-    set(name: string, value: string): void;
-}
-
-declare var Headers: {
-    prototype: Headers;
-    new(init?: HeadersInit): Headers;
-};
-
-interface History {
-    readonly length: number;
-    scrollRestoration: ScrollRestoration;
-    readonly state: any;
-    back(distance?: any): void;
-    forward(distance?: any): void;
-    go(delta?: any): void;
-    pushState(data: any, title?: string, url?: string | null): void;
-    replaceState(data: any, title?: string, url?: string | null): void;
-}
-
-declare var History: {
-    prototype: History;
-    new(): History;
-};
-
-interface HkdfCtrParams extends Algorithm {
-    context: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer;
-    hash: string | Algorithm;
-    label: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer;
-}
-
-interface IDBArrayKey extends Array<number | string | Date | IDBArrayKey> {
-}
-
-interface IDBCursor {
-    readonly direction: IDBCursorDirection;
-    readonly key: IDBKeyRange | number | string | Date | IDBArrayKey;
-    readonly primaryKey: any;
-    readonly source: IDBObjectStore | IDBIndex;
-    advance(count: number): void;
-    continue(key?: IDBKeyRange | number | string | Date | IDBArrayKey): void;
-    delete(): IDBRequest;
-    update(value: any): IDBRequest;
-    readonly NEXT: string;
-    readonly NEXT_NO_DUPLICATE: string;
-    readonly PREV: string;
-    readonly PREV_NO_DUPLICATE: string;
-}
-
-declare var IDBCursor: {
-    prototype: IDBCursor;
-    new(): IDBCursor;
-    readonly NEXT: string;
-    readonly NEXT_NO_DUPLICATE: string;
-    readonly PREV: string;
-    readonly PREV_NO_DUPLICATE: string;
-};
-
-interface IDBCursorWithValue extends IDBCursor {
-    readonly value: any;
-}
-
-declare var IDBCursorWithValue: {
-    prototype: IDBCursorWithValue;
-    new(): IDBCursorWithValue;
-};
-
-interface IDBDatabaseEventMap {
-    "abort": Event;
-    "error": Event;
-}
-
-interface IDBDatabase extends EventTarget {
-    readonly name: string;
-    readonly objectStoreNames: DOMStringList;
-    onabort: ((this: IDBDatabase, ev: Event) => any) | null;
-    onerror: ((this: IDBDatabase, ev: Event) => any) | null;
-    onversionchange: ((this: IDBDatabase, ev: Event) => any) | null;
-    readonly version: number;
-    close(): void;
-    createObjectStore(name: string, optionalParameters?: IDBObjectStoreParameters): IDBObjectStore;
-    deleteObjectStore(name: string): void;
-    transaction(storeNames: string | string[], mode?: IDBTransactionMode): IDBTransaction;
-    addEventListener<K extends keyof IDBDatabaseEventMap>(type: K, listener: (this: IDBDatabase, ev: IDBDatabaseEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof IDBDatabaseEventMap>(type: K, listener: (this: IDBDatabase, ev: IDBDatabaseEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var IDBDatabase: {
-    prototype: IDBDatabase;
-    new(): IDBDatabase;
-};
-
-interface IDBEnvironment {
-    readonly indexedDB: IDBFactory;
-}
-
-interface IDBFactory {
-    cmp(first: any, second: any): number;
-    deleteDatabase(name: string): IDBOpenDBRequest;
-    open(name: string, version?: number): IDBOpenDBRequest;
-}
-
-declare var IDBFactory: {
-    prototype: IDBFactory;
-    new(): IDBFactory;
-};
-
-interface IDBIndex {
-    readonly keyPath: string | string[];
-    multiEntry: boolean;
-    readonly name: string;
-    readonly objectStore: IDBObjectStore;
-    readonly unique: boolean;
-    count(key?: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-    get(key: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-    getKey(key: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-    openCursor(range?: IDBKeyRange | number | string | Date | IDBArrayKey, direction?: IDBCursorDirection): IDBRequest;
-    openKeyCursor(range?: IDBKeyRange | number | string | Date | IDBArrayKey, direction?: IDBCursorDirection): IDBRequest;
-}
-
-declare var IDBIndex: {
-    prototype: IDBIndex;
-    new(): IDBIndex;
-};
-
-interface IDBKeyRange {
-    readonly lower: any;
-    readonly lowerOpen: boolean;
-    readonly upper: any;
-    readonly upperOpen: boolean;
-}
-
-declare var IDBKeyRange: {
-    prototype: IDBKeyRange;
-    new(): IDBKeyRange;
-    bound(lower: any, upper: any, lowerOpen?: boolean, upperOpen?: boolean): IDBKeyRange;
-    lowerBound(lower: any, open?: boolean): IDBKeyRange;
-    only(value: any): IDBKeyRange;
-    upperBound(upper: any, open?: boolean): IDBKeyRange;
-};
-
-interface IDBObjectStore {
-    autoIncrement: boolean;
-    readonly indexNames: DOMStringList;
-    readonly keyPath: string | string[] | null;
-    readonly name: string;
-    readonly transaction: IDBTransaction;
-    add(value: any, key?: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-    clear(): IDBRequest;
-    count(key?: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-    createIndex(name: string, keyPath: string | string[], optionalParameters?: IDBIndexParameters): IDBIndex;
-    delete(key: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-    deleteIndex(indexName: string): void;
-    get(key: any): IDBRequest;
-    index(name: string): IDBIndex;
-    openCursor(range?: IDBKeyRange | number | string | Date | IDBArrayKey, direction?: IDBCursorDirection): IDBRequest;
-    put(value: any, key?: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-}
-
-declare var IDBObjectStore: {
-    prototype: IDBObjectStore;
-    new(): IDBObjectStore;
-};
-
-interface IDBOpenDBRequestEventMap extends IDBRequestEventMap {
-    "blocked": Event;
-    "upgradeneeded": IDBVersionChangeEvent;
-}
-
-interface IDBOpenDBRequest extends IDBRequest {
-    onblocked: ((this: IDBOpenDBRequest, ev: Event) => any) | null;
-    onupgradeneeded: ((this: IDBOpenDBRequest, ev: IDBVersionChangeEvent) => any) | null;
-    addEventListener<K extends keyof IDBOpenDBRequestEventMap>(type: K, listener: (this: IDBOpenDBRequest, ev: IDBOpenDBRequestEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof IDBOpenDBRequestEventMap>(type: K, listener: (this: IDBOpenDBRequest, ev: IDBOpenDBRequestEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var IDBOpenDBRequest: {
-    prototype: IDBOpenDBRequest;
-    new(): IDBOpenDBRequest;
-};
-
-interface IDBRequestEventMap {
-    "error": Event;
-    "success": Event;
-}
-
-interface IDBRequest extends EventTarget {
-    readonly error: DOMException;
-    onerror: ((this: IDBRequest, ev: Event) => any) | null;
-    onsuccess: ((this: IDBRequest, ev: Event) => any) | null;
-    readonly readyState: IDBRequestReadyState;
-    readonly result: any;
-    readonly source: IDBObjectStore | IDBIndex | IDBCursor;
-    readonly transaction: IDBTransaction;
-    addEventListener<K extends keyof IDBRequestEventMap>(type: K, listener: (this: IDBRequest, ev: IDBRequestEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof IDBRequestEventMap>(type: K, listener: (this: IDBRequest, ev: IDBRequestEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var IDBRequest: {
-    prototype: IDBRequest;
-    new(): IDBRequest;
-};
-
-interface IDBTransactionEventMap {
-    "abort": Event;
-    "complete": Event;
-    "error": Event;
-}
-
-interface IDBTransaction extends EventTarget {
-    readonly db: IDBDatabase;
-    readonly error: DOMException;
-    readonly mode: IDBTransactionMode;
-    onabort: ((this: IDBTransaction, ev: Event) => any) | null;
-    oncomplete: ((this: IDBTransaction, ev: Event) => any) | null;
-    onerror: ((this: IDBTransaction, ev: Event) => any) | null;
-    abort(): void;
-    objectStore(name: string): IDBObjectStore;
-    readonly READ_ONLY: string;
-    readonly READ_WRITE: string;
-    readonly VERSION_CHANGE: string;
-    addEventListener<K extends keyof IDBTransactionEventMap>(type: K, listener: (this: IDBTransaction, ev: IDBTransactionEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof IDBTransactionEventMap>(type: K, listener: (this: IDBTransaction, ev: IDBTransactionEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var IDBTransaction: {
-    prototype: IDBTransaction;
-    new(): IDBTransaction;
-    readonly READ_ONLY: string;
-    readonly READ_WRITE: string;
-    readonly VERSION_CHANGE: string;
-};
-
-interface IDBVersionChangeEvent extends Event {
-    readonly newVersion: number | null;
-    readonly oldVersion: number;
-}
-
-declare var IDBVersionChangeEvent: {
-    prototype: IDBVersionChangeEvent;
-    new(): IDBVersionChangeEvent;
-};
-
-interface IIRFilterNode extends AudioNode {
-    getFrequencyResponse(frequencyHz: Float32Array, magResponse: Float32Array, phaseResponse: Float32Array): void;
-}
-
-declare var IIRFilterNode: {
-    prototype: IIRFilterNode;
-    new(): IIRFilterNode;
-};
-
-interface ImageBitmap {
-    readonly height: number;
-    readonly width: number;
-    close(): void;
-}
-
-interface ImageBitmapOptions {
-    colorSpaceConversion?: "none" | "default";
-    imageOrientation?: "none" | "flipY";
-    premultiplyAlpha?: "none" | "premultiply" | "default";
-    resizeHeight?: number;
-    resizeQuality?: "pixelated" | "low" | "medium" | "high";
-    resizeWidth?: number;
-}
-
-interface ImageData {
-    readonly data: Uint8ClampedArray;
-    readonly height: number;
-    readonly width: number;
-}
-
-declare var ImageData: {
-    prototype: ImageData;
-    new(width: number, height: number): ImageData;
-    new(array: Uint8ClampedArray, width: number, height: number): ImageData;
-};
-
-interface IntersectionObserver {
-    readonly root: Element | null;
-    readonly rootMargin: string;
-    readonly thresholds: number[];
-    disconnect(): void;
-    observe(target: Element): void;
-    takeRecords(): IntersectionObserverEntry[];
-    unobserve(target: Element): void;
-}
-
-declare var IntersectionObserver: {
-    prototype: IntersectionObserver;
-    new(callback: IntersectionObserverCallback, options?: IntersectionObserverInit): IntersectionObserver;
-};
-
-interface IntersectionObserverEntry {
-    readonly boundingClientRect: ClientRect | DOMRect;
-    readonly intersectionRatio: number;
-    readonly intersectionRect: ClientRect | DOMRect;
-    readonly isIntersecting: boolean;
-    readonly rootBounds: ClientRect | DOMRect;
-    readonly target: Element;
-    readonly time: number;
-}
-
-declare var IntersectionObserverEntry: {
-    prototype: IntersectionObserverEntry;
-    new(intersectionObserverEntryInit: IntersectionObserverEntryInit): IntersectionObserverEntry;
-};
-
-interface KeyboardEvent extends UIEvent {
-    readonly altKey: boolean;
-    /** @deprecated */
-    char: string;
-    /** @deprecated */
-    readonly charCode: number;
-    readonly code: string;
-    readonly ctrlKey: boolean;
-    readonly key: string;
-    /** @deprecated */
-    readonly keyCode: number;
-    readonly location: number;
-    readonly metaKey: boolean;
-    readonly repeat: boolean;
-    readonly shiftKey: boolean;
-    /** @deprecated */
-    readonly which: number;
-    getModifierState(keyArg: string): boolean;
-    /** @deprecated */
-    initKeyboardEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, keyArg: string, locationArg: number, modifiersListArg: string, repeat: boolean, locale: string): void;
-    readonly DOM_KEY_LOCATION_JOYSTICK: number;
-    readonly DOM_KEY_LOCATION_LEFT: number;
-    readonly DOM_KEY_LOCATION_MOBILE: number;
-    readonly DOM_KEY_LOCATION_NUMPAD: number;
-    readonly DOM_KEY_LOCATION_RIGHT: number;
-    readonly DOM_KEY_LOCATION_STANDARD: number;
-}
-
-declare var KeyboardEvent: {
-    prototype: KeyboardEvent;
-    new(typeArg: string, eventInitDict?: KeyboardEventInit): KeyboardEvent;
-    readonly DOM_KEY_LOCATION_JOYSTICK: number;
-    readonly DOM_KEY_LOCATION_LEFT: number;
-    readonly DOM_KEY_LOCATION_MOBILE: number;
-    readonly DOM_KEY_LOCATION_NUMPAD: number;
-    readonly DOM_KEY_LOCATION_RIGHT: number;
-    readonly DOM_KEY_LOCATION_STANDARD: number;
-};
-
-interface LinkStyle {
-    readonly sheet: StyleSheet | null;
-}
-
-interface ListeningStateChangedEvent extends Event {
-    readonly label: string;
-    readonly state: ListeningState;
-}
-
-declare var ListeningStateChangedEvent: {
-    prototype: ListeningStateChangedEvent;
-    new(): ListeningStateChangedEvent;
-};
-
-interface Location {
-    hash: string;
-    host: string;
-    hostname: string;
-    href: string;
-    readonly origin: string;
-    pathname: string;
-    port: string;
-    protocol: string;
-    search: string;
-    assign(url: string): void;
-    reload(forcedReload?: boolean): void;
-    replace(url: string): void;
-    toString(): string;
-}
-
-declare var Location: {
-    prototype: Location;
-    new(): Location;
-};
-
-interface MSAssertion {
-    readonly id: string;
-    readonly type: MSCredentialType;
-}
-
-declare var MSAssertion: {
-    prototype: MSAssertion;
-    new(): MSAssertion;
-};
-
-interface MSBlobBuilder {
-    append(data: any, endings?: string): void;
-    getBlob(contentType?: string): Blob;
-}
-
-declare var MSBlobBuilder: {
-    prototype: MSBlobBuilder;
-    new(): MSBlobBuilder;
-};
-
-interface MSCredentials {
-    getAssertion(challenge: string, filter?: MSCredentialFilter, params?: MSSignatureParameters): Promise<MSAssertion>;
-    makeCredential(accountInfo: MSAccountInfo, params: MSCredentialParameters[], challenge?: string): Promise<MSAssertion>;
-}
-
-declare var MSCredentials: {
-    prototype: MSCredentials;
-    new(): MSCredentials;
-};
-
-interface MSDCCEvent extends Event {
-    readonly maxFr: number;
-    readonly maxFs: number;
-}
-
-declare var MSDCCEvent: {
-    prototype: MSDCCEvent;
-    new(type: string, eventInitDict: MSDCCEventInit): MSDCCEvent;
-};
-
-interface MSDSHEvent extends Event {
-    readonly sources: number[];
-    readonly timestamp: number;
-}
-
-declare var MSDSHEvent: {
-    prototype: MSDSHEvent;
-    new(type: string, eventInitDict: MSDSHEventInit): MSDSHEvent;
-};
-
-interface MSFIDOCredentialAssertion extends MSAssertion {
-    readonly algorithm: string | Algorithm;
-    readonly attestation: any;
-    readonly publicKey: string;
-    readonly transportHints: MSTransportType[];
-}
-
-declare var MSFIDOCredentialAssertion: {
-    prototype: MSFIDOCredentialAssertion;
-    new(): MSFIDOCredentialAssertion;
-};
-
-interface MSFIDOSignature {
-    readonly authnrData: string;
-    readonly clientData: string;
-    readonly signature: string;
-}
-
-declare var MSFIDOSignature: {
-    prototype: MSFIDOSignature;
-    new(): MSFIDOSignature;
-};
-
-interface MSFIDOSignatureAssertion extends MSAssertion {
-    readonly signature: MSFIDOSignature;
-}
-
-declare var MSFIDOSignatureAssertion: {
-    prototype: MSFIDOSignatureAssertion;
-    new(): MSFIDOSignatureAssertion;
-};
-
-interface MSFileSaver {
-    msSaveBlob(blob: any, defaultName?: string): boolean;
-    msSaveOrOpenBlob(blob: any, defaultName?: string): boolean;
-}
-
-interface MSGesture {
-    target: Element;
-    addPointer(pointerId: number): void;
-    stop(): void;
-}
-
-declare var MSGesture: {
-    prototype: MSGesture;
-    new(): MSGesture;
-};
-
-interface MSGestureEvent extends UIEvent {
-    readonly clientX: number;
-    readonly clientY: number;
-    readonly expansion: number;
-    readonly gestureObject: any;
-    readonly hwTimestamp: number;
-    readonly offsetX: number;
-    readonly offsetY: number;
-    readonly rotation: number;
-    readonly scale: number;
-    readonly screenX: number;
-    readonly screenY: number;
-    readonly translationX: number;
-    readonly translationY: number;
-    readonly velocityAngular: number;
-    readonly velocityExpansion: number;
-    readonly velocityX: number;
-    readonly velocityY: number;
-    initGestureEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number, screenXArg: number, screenYArg: number, clientXArg: number, clientYArg: number, offsetXArg: number, offsetYArg: number, translationXArg: number, translationYArg: number, scaleArg: number, expansionArg: number, rotationArg: number, velocityXArg: number, velocityYArg: number, velocityExpansionArg: number, velocityAngularArg: number, hwTimestampArg: number): void;
-    readonly MSGESTURE_FLAG_BEGIN: number;
-    readonly MSGESTURE_FLAG_CANCEL: number;
-    readonly MSGESTURE_FLAG_END: number;
-    readonly MSGESTURE_FLAG_INERTIA: number;
-    readonly MSGESTURE_FLAG_NONE: number;
-}
-
-declare var MSGestureEvent: {
-    prototype: MSGestureEvent;
-    new(): MSGestureEvent;
-    readonly MSGESTURE_FLAG_BEGIN: number;
-    readonly MSGESTURE_FLAG_CANCEL: number;
-    readonly MSGESTURE_FLAG_END: number;
-    readonly MSGESTURE_FLAG_INERTIA: number;
-    readonly MSGESTURE_FLAG_NONE: number;
-};
-
-interface MSGraphicsTrust {
-    readonly constrictionActive: boolean;
-    readonly status: string;
-}
-
-declare var MSGraphicsTrust: {
-    prototype: MSGraphicsTrust;
-    new(): MSGraphicsTrust;
-};
-
-interface MSInputMethodContextEventMap {
-    "MSCandidateWindowHide": Event;
-    "MSCandidateWindowShow": Event;
-    "MSCandidateWindowUpdate": Event;
-}
-
-interface MSInputMethodContext extends EventTarget {
-    readonly compositionEndOffset: number;
-    readonly compositionStartOffset: number;
-    oncandidatewindowhide: ((this: MSInputMethodContext, ev: Event) => any) | null;
-    oncandidatewindowshow: ((this: MSInputMethodContext, ev: Event) => any) | null;
-    oncandidatewindowupdate: ((this: MSInputMethodContext, ev: Event) => any) | null;
-    readonly target: HTMLElement;
-    getCandidateWindowClientRect(): ClientRect;
-    getCompositionAlternatives(): string[];
-    hasComposition(): boolean;
-    isCandidateWindowVisible(): boolean;
-    addEventListener<K extends keyof MSInputMethodContextEventMap>(type: K, listener: (this: MSInputMethodContext, ev: MSInputMethodContextEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof MSInputMethodContextEventMap>(type: K, listener: (this: MSInputMethodContext, ev: MSInputMethodContextEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var MSInputMethodContext: {
-    prototype: MSInputMethodContext;
-    new(): MSInputMethodContext;
-};
-
-interface MSMediaKeyError {
-    readonly code: number;
-    readonly systemCode: number;
-    readonly MS_MEDIA_KEYERR_CLIENT: number;
-    readonly MS_MEDIA_KEYERR_DOMAIN: number;
-    readonly MS_MEDIA_KEYERR_HARDWARECHANGE: number;
-    readonly MS_MEDIA_KEYERR_OUTPUT: number;
-    readonly MS_MEDIA_KEYERR_SERVICE: number;
-    readonly MS_MEDIA_KEYERR_UNKNOWN: number;
-}
-
-declare var MSMediaKeyError: {
-    prototype: MSMediaKeyError;
-    new(): MSMediaKeyError;
-    readonly MS_MEDIA_KEYERR_CLIENT: number;
-    readonly MS_MEDIA_KEYERR_DOMAIN: number;
-    readonly MS_MEDIA_KEYERR_HARDWARECHANGE: number;
-    readonly MS_MEDIA_KEYERR_OUTPUT: number;
-    readonly MS_MEDIA_KEYERR_SERVICE: number;
-    readonly MS_MEDIA_KEYERR_UNKNOWN: number;
-};
-
-interface MSMediaKeyMessageEvent extends Event {
-    readonly destinationURL: string | null;
-    readonly message: Uint8Array;
-}
-
-declare var MSMediaKeyMessageEvent: {
-    prototype: MSMediaKeyMessageEvent;
-    new(): MSMediaKeyMessageEvent;
-};
-
-interface MSMediaKeyNeededEvent extends Event {
-    readonly initData: Uint8Array | null;
-}
-
-declare var MSMediaKeyNeededEvent: {
-    prototype: MSMediaKeyNeededEvent;
-    new(): MSMediaKeyNeededEvent;
-};
-
-interface MSMediaKeySession extends EventTarget {
-    readonly error: MSMediaKeyError | null;
-    readonly keySystem: string;
-    readonly sessionId: string;
-    close(): void;
-    update(key: Uint8Array): void;
-}
-
-declare var MSMediaKeySession: {
-    prototype: MSMediaKeySession;
-    new(): MSMediaKeySession;
-};
-
-interface MSMediaKeys {
-    readonly keySystem: string;
-    createSession(type: string, initData: Uint8Array, cdmData?: Uint8Array | null): MSMediaKeySession;
-}
-
-declare var MSMediaKeys: {
-    prototype: MSMediaKeys;
-    new(keySystem: string): MSMediaKeys;
-    isTypeSupported(keySystem: string, type?: string | null): boolean;
-    isTypeSupportedWithFeatures(keySystem: string, type?: string | null): string;
-};
-
-interface MSNavigatorDoNotTrack {
-    confirmSiteSpecificTrackingException(args: ConfirmSiteSpecificExceptionsInformation): boolean;
-    confirmWebWideTrackingException(args: ExceptionInformation): boolean;
-    removeSiteSpecificTrackingException(args: ExceptionInformation): void;
-    removeWebWideTrackingException(args: ExceptionInformation): void;
-    storeSiteSpecificTrackingException(args: StoreSiteSpecificExceptionsInformation): void;
-    storeWebWideTrackingException(args: StoreExceptionsInformation): void;
-}
-
-interface MSPointerEvent extends MouseEvent {
-    readonly currentPoint: any;
-    readonly height: number;
-    readonly hwTimestamp: number;
-    readonly intermediatePoints: any;
-    readonly isPrimary: boolean;
-    readonly pointerId: number;
-    readonly pointerType: any;
-    readonly pressure: number;
-    readonly rotation: number;
-    readonly tiltX: number;
-    readonly tiltY: number;
-    readonly width: number;
-    getCurrentPoint(element: Element): void;
-    getIntermediatePoints(element: Element): void;
-    initPointerEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number, screenXArg: number, screenYArg: number, clientXArg: number, clientYArg: number, ctrlKeyArg: boolean, altKeyArg: boolean, shiftKeyArg: boolean, metaKeyArg: boolean, buttonArg: number, relatedTargetArg: EventTarget, offsetXArg: number, offsetYArg: number, widthArg: number, heightArg: number, pressure: number, rotation: number, tiltX: number, tiltY: number, pointerIdArg: number, pointerType: any, hwTimestampArg: number, isPrimary: boolean): void;
-}
-
-declare var MSPointerEvent: {
-    prototype: MSPointerEvent;
-    new(typeArg: string, eventInitDict?: PointerEventInit): MSPointerEvent;
-};
-
-interface MSStream {
-    readonly type: string;
-    msClose(): void;
-    msDetachStream(): any;
-}
-
-declare var MSStream: {
-    prototype: MSStream;
-    new(): MSStream;
-};
-
-interface MSStreamReaderEventMap {
-    "abort": UIEvent;
-    "error": ErrorEvent;
-    "load": Event;
-    "loadend": ProgressEvent;
-    "loadstart": Event;
-    "progress": ProgressEvent;
-}
-
-interface MSStreamReader extends EventTarget {
-    readonly error: DOMError;
-    onabort: ((this: MSStreamReader, ev: UIEvent) => any) | null;
-    onerror: ((this: MSStreamReader, ev: ErrorEvent) => any) | null;
-    onload: ((this: MSStreamReader, ev: Event) => any) | null;
-    onloadend: ((this: MSStreamReader, ev: ProgressEvent) => any) | null;
-    onloadstart: ((this: MSStreamReader, ev: Event) => any) | null;
-    onprogress: ((this: MSStreamReader, ev: ProgressEvent) => any) | null;
-    readonly readyState: number;
-    readonly result: any;
-    abort(): void;
-    readAsArrayBuffer(stream: MSStream, size?: number): void;
-    readAsBinaryString(stream: MSStream, size?: number): void;
-    readAsBlob(stream: MSStream, size?: number): void;
-    readAsDataURL(stream: MSStream, size?: number): void;
-    readAsText(stream: MSStream, encoding?: string, size?: number): void;
-    readonly DONE: number;
-    readonly EMPTY: number;
-    readonly LOADING: number;
-    addEventListener<K extends keyof MSStreamReaderEventMap>(type: K, listener: (this: MSStreamReader, ev: MSStreamReaderEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof MSStreamReaderEventMap>(type: K, listener: (this: MSStreamReader, ev: MSStreamReaderEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var MSStreamReader: {
-    prototype: MSStreamReader;
-    new(): MSStreamReader;
-    readonly DONE: number;
-    readonly EMPTY: number;
-    readonly LOADING: number;
-};
-
-interface MediaDeviceInfo {
-    readonly deviceId: string;
-    readonly groupId: string;
-    readonly kind: MediaDeviceKind;
-    readonly label: string;
-}
-
-declare var MediaDeviceInfo: {
-    prototype: MediaDeviceInfo;
-    new(): MediaDeviceInfo;
-};
-
-interface MediaDevicesEventMap {
-    "devicechange": Event;
-}
-
-interface MediaDevices extends EventTarget {
-    ondevicechange: ((this: MediaDevices, ev: Event) => any) | null;
-    enumerateDevices(): Promise<MediaDeviceInfo[]>;
-    getSupportedConstraints(): MediaTrackSupportedConstraints;
-    getUserMedia(constraints: MediaStreamConstraints): Promise<MediaStream>;
-    addEventListener<K extends keyof MediaDevicesEventMap>(type: K, listener: (this: MediaDevices, ev: MediaDevicesEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof MediaDevicesEventMap>(type: K, listener: (this: MediaDevices, ev: MediaDevicesEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var MediaDevices: {
-    prototype: MediaDevices;
-    new(): MediaDevices;
-};
-
-interface MediaElementAudioSourceNode extends AudioNode {
-}
-
-declare var MediaElementAudioSourceNode: {
-    prototype: MediaElementAudioSourceNode;
-    new(): MediaElementAudioSourceNode;
-};
-
-interface MediaEncryptedEvent extends Event {
-    readonly initData: ArrayBuffer | null;
-    readonly initDataType: string;
-}
-
-declare var MediaEncryptedEvent: {
-    prototype: MediaEncryptedEvent;
-    new(type: string, eventInitDict?: MediaEncryptedEventInit): MediaEncryptedEvent;
-};
-
-interface MediaError {
-    readonly code: number;
-    readonly message: string;
-    readonly msExtendedCode: number;
-    readonly MEDIA_ERR_ABORTED: number;
-    readonly MEDIA_ERR_DECODE: number;
-    readonly MEDIA_ERR_NETWORK: number;
-    readonly MEDIA_ERR_SRC_NOT_SUPPORTED: number;
-    readonly MS_MEDIA_ERR_ENCRYPTED: number;
-}
-
-declare var MediaError: {
-    prototype: MediaError;
-    new(): MediaError;
-    readonly MEDIA_ERR_ABORTED: number;
-    readonly MEDIA_ERR_DECODE: number;
-    readonly MEDIA_ERR_NETWORK: number;
-    readonly MEDIA_ERR_SRC_NOT_SUPPORTED: number;
-    readonly MS_MEDIA_ERR_ENCRYPTED: number;
-};
-
-interface MediaKeyMessageEvent extends Event {
-    readonly message: ArrayBuffer;
-    readonly messageType: MediaKeyMessageType;
-}
-
-declare var MediaKeyMessageEvent: {
-    prototype: MediaKeyMessageEvent;
-    new(type: string, eventInitDict?: MediaKeyMessageEventInit): MediaKeyMessageEvent;
-};
-
-interface MediaKeySession extends EventTarget {
-    readonly closed: Promise<void>;
-    readonly expiration: number;
-    readonly keyStatuses: MediaKeyStatusMap;
-    readonly sessionId: string;
-    close(): Promise<void>;
-    generateRequest(initDataType: string, initData: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null): Promise<void>;
-    load(sessionId: string): Promise<boolean>;
-    remove(): Promise<void>;
-    update(response: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null): Promise<void>;
-}
-
-declare var MediaKeySession: {
-    prototype: MediaKeySession;
-    new(): MediaKeySession;
-};
-
-interface MediaKeyStatusMap {
-    readonly size: number;
-    forEach(callback: Function, thisArg?: any): void;
-    get(keyId: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null): MediaKeyStatus;
-    has(keyId: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null): boolean;
-}
-
-declare var MediaKeyStatusMap: {
-    prototype: MediaKeyStatusMap;
-    new(): MediaKeyStatusMap;
-};
-
-interface MediaKeySystemAccess {
-    readonly keySystem: string;
-    createMediaKeys(): Promise<MediaKeys>;
-    getConfiguration(): MediaKeySystemConfiguration;
-}
-
-declare var MediaKeySystemAccess: {
-    prototype: MediaKeySystemAccess;
-    new(): MediaKeySystemAccess;
-};
-
-interface MediaKeys {
-    createSession(sessionType?: MediaKeySessionType): MediaKeySession;
-    setServerCertificate(serverCertificate: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null): Promise<void>;
-}
-
-declare var MediaKeys: {
-    prototype: MediaKeys;
-    new(): MediaKeys;
-};
-
-interface MediaList {
-    readonly length: number;
-    mediaText: string;
-    appendMedium(medium: string): void;
-    deleteMedium(medium: string): void;
-    item(index: number): string | null;
-    toString(): number;
-    [index: number]: string;
-}
-
-declare var MediaList: {
-    prototype: MediaList;
-    new(): MediaList;
-};
-
-interface MediaQueryList {
-    readonly matches: boolean;
-    readonly media: string;
-    addListener(listener: MediaQueryListListener): void;
-    removeListener(listener: MediaQueryListListener): void;
-}
-
-declare var MediaQueryList: {
-    prototype: MediaQueryList;
-    new(): MediaQueryList;
-};
-
-interface MediaSource extends EventTarget {
-    readonly activeSourceBuffers: SourceBufferList;
-    duration: number;
-    readonly readyState: string;
-    readonly sourceBuffers: SourceBufferList;
-    addSourceBuffer(type: string): SourceBuffer;
-    endOfStream(error?: number): void;
-    removeSourceBuffer(sourceBuffer: SourceBuffer): void;
-}
-
-declare var MediaSource: {
-    prototype: MediaSource;
-    new(): MediaSource;
-    isTypeSupported(type: string): boolean;
-};
-
-interface MediaStreamEventMap {
-    "active": Event;
-    "addtrack": MediaStreamTrackEvent;
-    "inactive": Event;
-    "removetrack": MediaStreamTrackEvent;
-}
-
-interface MediaStream extends EventTarget {
-    readonly active: boolean;
-    readonly id: string;
-    onactive: ((this: MediaStream, ev: Event) => any) | null;
-    onaddtrack: ((this: MediaStream, ev: MediaStreamTrackEvent) => any) | null;
-    oninactive: ((this: MediaStream, ev: Event) => any) | null;
-    onremovetrack: ((this: MediaStream, ev: MediaStreamTrackEvent) => any) | null;
-    addTrack(track: MediaStreamTrack): void;
-    clone(): MediaStream;
-    getAudioTracks(): MediaStreamTrack[];
-    getTrackById(trackId: string): MediaStreamTrack | null;
-    getTracks(): MediaStreamTrack[];
-    getVideoTracks(): MediaStreamTrack[];
-    removeTrack(track: MediaStreamTrack): void;
-    stop(): void;
-    addEventListener<K extends keyof MediaStreamEventMap>(type: K, listener: (this: MediaStream, ev: MediaStreamEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof MediaStreamEventMap>(type: K, listener: (this: MediaStream, ev: MediaStreamEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var MediaStream: {
-    prototype: MediaStream;
-    new(): MediaStream;
-    new(stream: MediaStream): MediaStream;
-    new(tracks: MediaStreamTrack[]): MediaStream;
-};
-
-interface MediaStreamAudioSourceNode extends AudioNode {
-}
-
-declare var MediaStreamAudioSourceNode: {
-    prototype: MediaStreamAudioSourceNode;
-    new(): MediaStreamAudioSourceNode;
-};
-
-interface MediaStreamError {
-    readonly constraintName: string | null;
-    readonly message: string | null;
-    readonly name: string;
-}
-
-declare var MediaStreamError: {
-    prototype: MediaStreamError;
-    new(): MediaStreamError;
-};
-
-interface MediaStreamErrorEvent extends Event {
-    readonly error: MediaStreamError | null;
-}
-
-declare var MediaStreamErrorEvent: {
-    prototype: MediaStreamErrorEvent;
-    new(typeArg: string, eventInitDict?: MediaStreamErrorEventInit): MediaStreamErrorEvent;
-};
-
-interface MediaStreamEvent extends Event {
-    readonly stream: MediaStream | null;
-}
-
-declare var MediaStreamEvent: {
-    prototype: MediaStreamEvent;
-    new(type: string, eventInitDict: MediaStreamEventInit): MediaStreamEvent;
-};
-
-interface MediaStreamTrackEventMap {
-    "ended": MediaStreamErrorEvent;
-    "mute": Event;
-    "overconstrained": MediaStreamErrorEvent;
-    "unmute": Event;
-}
-
-interface MediaStreamTrack extends EventTarget {
-    enabled: boolean;
-    readonly id: string;
-    readonly kind: string;
-    readonly label: string;
-    readonly muted: boolean;
-    onended: ((this: MediaStreamTrack, ev: MediaStreamErrorEvent) => any) | null;
-    onmute: ((this: MediaStreamTrack, ev: Event) => any) | null;
-    onoverconstrained: ((this: MediaStreamTrack, ev: MediaStreamErrorEvent) => any) | null;
-    onunmute: ((this: MediaStreamTrack, ev: Event) => any) | null;
-    readonly readonly: boolean;
-    readonly readyState: MediaStreamTrackState;
-    readonly remote: boolean;
-    applyConstraints(constraints: MediaTrackConstraints): Promise<void>;
-    clone(): MediaStreamTrack;
-    getCapabilities(): MediaTrackCapabilities;
-    getConstraints(): MediaTrackConstraints;
-    getSettings(): MediaTrackSettings;
-    stop(): void;
-    addEventListener<K extends keyof MediaStreamTrackEventMap>(type: K, listener: (this: MediaStreamTrack, ev: MediaStreamTrackEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof MediaStreamTrackEventMap>(type: K, listener: (this: MediaStreamTrack, ev: MediaStreamTrackEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var MediaStreamTrack: {
-    prototype: MediaStreamTrack;
-    new(): MediaStreamTrack;
-};
-
-interface MediaStreamTrackEvent extends Event {
-    readonly track: MediaStreamTrack;
-}
-
-declare var MediaStreamTrackEvent: {
-    prototype: MediaStreamTrackEvent;
-    new(typeArg: string, eventInitDict?: MediaStreamTrackEventInit): MediaStreamTrackEvent;
-};
-
-interface MessageChannel {
-    readonly port1: MessagePort;
-    readonly port2: MessagePort;
-}
-
-declare var MessageChannel: {
-    prototype: MessageChannel;
-    new(): MessageChannel;
-};
-
-interface MessageEvent extends Event {
-    readonly data: any;
-    readonly origin: string;
-    readonly ports: ReadonlyArray<MessagePort>;
-    readonly source: Window | null;
-    initMessageEvent(type: string, bubbles: boolean, cancelable: boolean, data: any, origin: string, lastEventId: string, source: Window): void;
-}
-
-declare var MessageEvent: {
-    prototype: MessageEvent;
-    new(type: string, eventInitDict?: MessageEventInit): MessageEvent;
-};
-
-interface MessagePortEventMap {
-    "message": MessageEvent;
-}
-
-interface MessagePort extends EventTarget {
-    onmessage: ((this: MessagePort, ev: MessageEvent) => any) | null;
-    close(): void;
-    postMessage(message?: any, transfer?: any[]): void;
-    start(): void;
-    addEventListener<K extends keyof MessagePortEventMap>(type: K, listener: (this: MessagePort, ev: MessagePortEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof MessagePortEventMap>(type: K, listener: (this: MessagePort, ev: MessagePortEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var MessagePort: {
-    prototype: MessagePort;
-    new(): MessagePort;
-};
-
-interface MimeType {
-    readonly description: string;
-    readonly enabledPlugin: Plugin;
-    readonly suffixes: string;
-    readonly type: string;
-}
-
-declare var MimeType: {
-    prototype: MimeType;
-    new(): MimeType;
-};
-
-interface MimeTypeArray {
-    readonly length: number;
-    item(index: number): Plugin;
-    namedItem(type: string): Plugin;
-    [index: number]: Plugin;
-}
-
-declare var MimeTypeArray: {
-    prototype: MimeTypeArray;
-    new(): MimeTypeArray;
-};
-
-interface MouseEvent extends UIEvent {
-    readonly altKey: boolean;
-    readonly button: number;
-    readonly buttons: number;
-    readonly clientX: number;
-    readonly clientY: number;
-    readonly ctrlKey: boolean;
-    /** @deprecated */
-    readonly fromElement: Element;
-    readonly layerX: number;
-    readonly layerY: number;
-    readonly metaKey: boolean;
-    readonly movementX: number;
-    readonly movementY: number;
-    readonly offsetX: number;
-    readonly offsetY: number;
-    readonly pageX: number;
-    readonly pageY: number;
-    readonly relatedTarget: EventTarget;
-    readonly screenX: number;
-    readonly screenY: number;
-    readonly shiftKey: boolean;
-    /** @deprecated */
-    readonly toElement: Element;
-    /** @deprecated */
-    readonly which: number;
-    readonly x: number;
-    readonly y: number;
-    getModifierState(keyArg: string): boolean;
-    initMouseEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number, screenXArg: number, screenYArg: number, clientXArg: number, clientYArg: number, ctrlKeyArg: boolean, altKeyArg: boolean, shiftKeyArg: boolean, metaKeyArg: boolean, buttonArg: number, relatedTargetArg: EventTarget | null): void;
-}
-
-declare var MouseEvent: {
-    prototype: MouseEvent;
-    new(typeArg: string, eventInitDict?: MouseEventInit): MouseEvent;
-};
-
-interface MutationEvent extends Event {
-    readonly attrChange: number;
-    readonly attrName: string;
-    readonly newValue: string;
-    readonly prevValue: string;
-    readonly relatedNode: Node;
-    initMutationEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, relatedNodeArg: Node, prevValueArg: string, newValueArg: string, attrNameArg: string, attrChangeArg: number): void;
-    readonly ADDITION: number;
-    readonly MODIFICATION: number;
-    readonly REMOVAL: number;
-}
-
-declare var MutationEvent: {
-    prototype: MutationEvent;
-    new(): MutationEvent;
-    readonly ADDITION: number;
-    readonly MODIFICATION: number;
-    readonly REMOVAL: number;
-};
-
-interface MutationObserver {
-    disconnect(): void;
-    observe(target: Node, options: MutationObserverInit): void;
-    takeRecords(): MutationRecord[];
-}
-
-declare var MutationObserver: {
-    prototype: MutationObserver;
-    new(callback: MutationCallback): MutationObserver;
-};
-
-interface MutationRecord {
-    readonly addedNodes: NodeList;
-    readonly attributeName: string | null;
-    readonly attributeNamespace: string | null;
-    readonly nextSibling: Node | null;
-    readonly oldValue: string | null;
-    readonly previousSibling: Node | null;
-    readonly removedNodes: NodeList;
-    readonly target: Node;
-    readonly type: MutationRecordType;
-}
-
-declare var MutationRecord: {
-    prototype: MutationRecord;
-    new(): MutationRecord;
-};
-
-interface NamedNodeMap {
-    readonly length: number;
-    getNamedItem(qualifiedName: string): Attr | null;
-    getNamedItemNS(namespace: string | null, localName: string): Attr | null;
-    item(index: number): Attr | null;
-    removeNamedItem(qualifiedName: string): Attr;
-    removeNamedItemNS(namespace: string | null, localName: string): Attr;
-    setNamedItem(attr: Attr): Attr | null;
-    setNamedItemNS(attr: Attr): Attr | null;
-    [index: number]: Attr;
-}
-
-declare var NamedNodeMap: {
-    prototype: NamedNodeMap;
-    new(): NamedNodeMap;
-};
-
-interface Navigator extends NavigatorID, NavigatorOnLine, NavigatorContentUtils, NavigatorStorageUtils, MSNavigatorDoNotTrack, MSFileSaver, NavigatorBeacon, NavigatorConcurrentHardware, NavigatorUserMedia, NavigatorLanguage {
-    readonly activeVRDisplays: ReadonlyArray<VRDisplay>;
-    readonly authentication: WebAuthentication;
-    readonly cookieEnabled: boolean;
-    readonly doNotTrack: string | null;
-    gamepadInputEmulation: GamepadInputEmulationType;
-    readonly geolocation: Geolocation;
-    readonly maxTouchPoints: number;
-    readonly mimeTypes: MimeTypeArray;
-    readonly msManipulationViewsEnabled: boolean;
-    readonly msMaxTouchPoints: number;
-    readonly msPointerEnabled: boolean;
-    readonly plugins: PluginArray;
-    readonly pointerEnabled: boolean;
-    readonly serviceWorker: ServiceWorkerContainer;
-    readonly webdriver: boolean;
-    getGamepads(): (Gamepad | null)[];
-    getVRDisplays(): Promise<VRDisplay[]>;
-    javaEnabled(): boolean;
-    msLaunchUri(uri: string, successCallback?: MSLaunchUriCallback, noHandlerCallback?: MSLaunchUriCallback): void;
-    requestMediaKeySystemAccess(keySystem: string, supportedConfigurations: MediaKeySystemConfiguration[]): Promise<MediaKeySystemAccess>;
-    vibrate(pattern: number | number[]): boolean;
-}
-
-declare var Navigator: {
-    prototype: Navigator;
-    new(): Navigator;
-};
-
-interface NavigatorBeacon {
-    sendBeacon(url: string, data?: Blob | Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | FormData | string | null): boolean;
-}
-
-interface NavigatorConcurrentHardware {
-    readonly hardwareConcurrency: number;
-}
-
-interface NavigatorContentUtils {
-}
-
-interface NavigatorID {
-    readonly appCodeName: string;
-    readonly appName: string;
-    readonly appVersion: string;
-    readonly platform: string;
-    readonly product: string;
-    readonly productSub: string;
-    readonly userAgent: string;
-    readonly vendor: string;
-    readonly vendorSub: string;
-}
-
-interface NavigatorLanguage {
-    readonly language: string;
-    readonly languages: ReadonlyArray<string>;
-}
-
-interface NavigatorOnLine {
-    readonly onLine: boolean;
-}
-
-interface NavigatorStorageUtils {
-}
-
-interface NavigatorUserMedia {
-    readonly mediaDevices: MediaDevices;
-    getDisplayMedia(constraints: MediaStreamConstraints): Promise<MediaStream>;
-    getUserMedia(constraints: MediaStreamConstraints, successCallback: NavigatorUserMediaSuccessCallback, errorCallback: NavigatorUserMediaErrorCallback): void;
-}
-
-interface Node extends EventTarget {
-    readonly baseURI: string | null;
-    readonly childNodes: NodeListOf<Node & ChildNode>;
-    readonly firstChild: Node | null;
-    readonly isConnected: boolean;
-    readonly lastChild: Node | null;
-    readonly localName: string | null;
-    readonly namespaceURI: string | null;
-    readonly nextSibling: Node | null;
-    readonly nodeName: string;
-    readonly nodeType: number;
-    nodeValue: string | null;
-    readonly ownerDocument: Document;
-    readonly parentElement: HTMLElement | null;
-    readonly parentNode: Node | null;
-    readonly previousSibling: Node | null;
-    textContent: string | null;
-    appendChild<T extends Node>(newChild: T): T;
-    cloneNode(deep?: boolean): Node;
-    compareDocumentPosition(other: Node): number;
-    contains(child: Node): boolean;
-    hasChildNodes(): boolean;
-    insertBefore<T extends Node>(newChild: T, refChild: Node | null): T;
-    isDefaultNamespace(namespaceURI: string | null): boolean;
-    isEqualNode(arg: Node): boolean;
-    isSameNode(other: Node): boolean;
-    lookupNamespaceURI(prefix: string | null): string | null;
-    lookupPrefix(namespaceURI: string | null): string | null;
-    normalize(): void;
-    removeChild<T extends Node>(oldChild: T): T;
-    replaceChild<T extends Node>(newChild: Node, oldChild: T): T;
-    readonly ATTRIBUTE_NODE: number;
-    readonly CDATA_SECTION_NODE: number;
-    readonly COMMENT_NODE: number;
-    readonly DOCUMENT_FRAGMENT_NODE: number;
-    readonly DOCUMENT_NODE: number;
-    readonly DOCUMENT_POSITION_CONTAINED_BY: number;
-    readonly DOCUMENT_POSITION_CONTAINS: number;
-    readonly DOCUMENT_POSITION_DISCONNECTED: number;
-    readonly DOCUMENT_POSITION_FOLLOWING: number;
-    readonly DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC: number;
-    readonly DOCUMENT_POSITION_PRECEDING: number;
-    readonly DOCUMENT_TYPE_NODE: number;
-    readonly ELEMENT_NODE: number;
-    readonly ENTITY_NODE: number;
-    readonly ENTITY_REFERENCE_NODE: number;
-    readonly NOTATION_NODE: number;
-    readonly PROCESSING_INSTRUCTION_NODE: number;
-    readonly TEXT_NODE: number;
-}
-
-declare var Node: {
-    prototype: Node;
-    new(): Node;
-    readonly ATTRIBUTE_NODE: number;
-    readonly CDATA_SECTION_NODE: number;
-    readonly COMMENT_NODE: number;
-    readonly DOCUMENT_FRAGMENT_NODE: number;
-    readonly DOCUMENT_NODE: number;
-    readonly DOCUMENT_POSITION_CONTAINED_BY: number;
-    readonly DOCUMENT_POSITION_CONTAINS: number;
-    readonly DOCUMENT_POSITION_DISCONNECTED: number;
-    readonly DOCUMENT_POSITION_FOLLOWING: number;
-    readonly DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC: number;
-    readonly DOCUMENT_POSITION_PRECEDING: number;
-    readonly DOCUMENT_TYPE_NODE: number;
-    readonly ELEMENT_NODE: number;
-    readonly ENTITY_NODE: number;
-    readonly ENTITY_REFERENCE_NODE: number;
-    readonly NOTATION_NODE: number;
-    readonly PROCESSING_INSTRUCTION_NODE: number;
-    readonly TEXT_NODE: number;
-};
-
-interface NodeFilter {
-    acceptNode(node: Node): number;
-}
-
-declare var NodeFilter: {
-    readonly FILTER_ACCEPT: number;
-    readonly FILTER_REJECT: number;
-    readonly FILTER_SKIP: number;
-    readonly SHOW_ALL: number;
-    readonly SHOW_ATTRIBUTE: number;
-    readonly SHOW_CDATA_SECTION: number;
-    readonly SHOW_COMMENT: number;
-    readonly SHOW_DOCUMENT: number;
-    readonly SHOW_DOCUMENT_FRAGMENT: number;
-    readonly SHOW_DOCUMENT_TYPE: number;
-    readonly SHOW_ELEMENT: number;
-    readonly SHOW_ENTITY: number;
-    readonly SHOW_ENTITY_REFERENCE: number;
-    readonly SHOW_NOTATION: number;
-    readonly SHOW_PROCESSING_INSTRUCTION: number;
-    readonly SHOW_TEXT: number;
-};
-
-interface NodeIterator {
-    /** @deprecated */
-    readonly expandEntityReferences: boolean;
-    readonly filter: NodeFilter | null;
-    readonly root: Node;
-    readonly whatToShow: number;
-    detach(): void;
-    nextNode(): Node | null;
-    previousNode(): Node | null;
-}
-
-declare var NodeIterator: {
-    prototype: NodeIterator;
-    new(): NodeIterator;
-};
-
-interface NodeList {
-    readonly length: number;
-    item(index: number): Node;
-    [index: number]: Node;
-}
-
-declare var NodeList: {
-    prototype: NodeList;
-    new(): NodeList;
-};
-
-interface NodeListOf<TNode extends Node> extends NodeList {
-    length: number;
-    item(index: number): TNode;
-    [index: number]: TNode;
-}
-
-interface NodeSelector {
-    querySelector<K extends keyof HTMLElementTagNameMap>(selectors: K): HTMLElementTagNameMap[K] | null;
-    querySelector<K extends keyof SVGElementTagNameMap>(selectors: K): SVGElementTagNameMap[K] | null;
-    querySelector<E extends Element = Element>(selectors: string): E | null;
-    querySelectorAll<K extends keyof HTMLElementTagNameMap>(selectors: K): NodeListOf<HTMLElementTagNameMap[K]>;
-    querySelectorAll<K extends keyof SVGElementTagNameMap>(selectors: K): NodeListOf<SVGElementTagNameMap[K]>;
-    querySelectorAll<E extends Element = Element>(selectors: string): NodeListOf<E>;
-}
-
-interface NotificationEventMap {
-    "click": Event;
-    "close": Event;
-    "error": Event;
-    "show": Event;
-}
-
-interface Notification extends EventTarget {
-    readonly body: string | null;
-    readonly data: any;
-    readonly dir: NotificationDirection;
-    readonly icon: string | null;
-    readonly lang: string | null;
-    onclick: ((this: Notification, ev: Event) => any) | null;
-    onclose: ((this: Notification, ev: Event) => any) | null;
-    onerror: ((this: Notification, ev: Event) => any) | null;
-    onshow: ((this: Notification, ev: Event) => any) | null;
-    readonly permission: NotificationPermission;
-    readonly tag: string | null;
-    readonly title: string;
-    close(): void;
-    addEventListener<K extends keyof NotificationEventMap>(type: K, listener: (this: Notification, ev: NotificationEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof NotificationEventMap>(type: K, listener: (this: Notification, ev: NotificationEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var Notification: {
-    prototype: Notification;
-    new(title: string, options?: NotificationOptions): Notification;
-    requestPermission(callback?: NotificationPermissionCallback): Promise<NotificationPermission>;
-};
-
-interface OES_element_index_uint {
-}
-
-declare var OES_element_index_uint: {
-    prototype: OES_element_index_uint;
-    new(): OES_element_index_uint;
-};
-
-interface OES_standard_derivatives {
-    readonly FRAGMENT_SHADER_DERIVATIVE_HINT_OES: number;
-}
-
-declare var OES_standard_derivatives: {
-    prototype: OES_standard_derivatives;
-    new(): OES_standard_derivatives;
-    readonly FRAGMENT_SHADER_DERIVATIVE_HINT_OES: number;
-};
-
-interface OES_texture_float {
-}
-
-declare var OES_texture_float: {
-    prototype: OES_texture_float;
-    new(): OES_texture_float;
-};
-
-interface OES_texture_float_linear {
-}
-
-declare var OES_texture_float_linear: {
-    prototype: OES_texture_float_linear;
-    new(): OES_texture_float_linear;
-};
-
-interface OES_texture_half_float {
-    readonly HALF_FLOAT_OES: number;
-}
-
-declare var OES_texture_half_float: {
-    prototype: OES_texture_half_float;
-    new(): OES_texture_half_float;
-    readonly HALF_FLOAT_OES: number;
-};
-
-interface OES_texture_half_float_linear {
-}
-
-declare var OES_texture_half_float_linear: {
-    prototype: OES_texture_half_float_linear;
-    new(): OES_texture_half_float_linear;
-};
-
-interface OES_vertex_array_object {
-    readonly VERTEX_ARRAY_BINDING_OES: number;
-    bindVertexArrayOES(arrayObject: WebGLVertexArrayObjectOES): void;
-    createVertexArrayOES(): WebGLVertexArrayObjectOES;
-    deleteVertexArrayOES(arrayObject: WebGLVertexArrayObjectOES): void;
-    isVertexArrayOES(value: any): value is WebGLVertexArrayObjectOES;
-}
-
-interface OfflineAudioCompletionEvent extends Event {
-    readonly renderedBuffer: AudioBuffer;
-}
-
-declare var OfflineAudioCompletionEvent: {
-    prototype: OfflineAudioCompletionEvent;
-    new(): OfflineAudioCompletionEvent;
-};
-
-interface OfflineAudioContextEventMap extends AudioContextEventMap {
-    "complete": OfflineAudioCompletionEvent;
-}
-
-interface OfflineAudioContext extends AudioContextBase {
-    readonly length: number;
-    oncomplete: ((this: OfflineAudioContext, ev: OfflineAudioCompletionEvent) => any) | null;
-    startRendering(): Promise<AudioBuffer>;
-    suspend(suspendTime: number): Promise<void>;
-    addEventListener<K extends keyof OfflineAudioContextEventMap>(type: K, listener: (this: OfflineAudioContext, ev: OfflineAudioContextEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof OfflineAudioContextEventMap>(type: K, listener: (this: OfflineAudioContext, ev: OfflineAudioContextEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var OfflineAudioContext: {
-    prototype: OfflineAudioContext;
-    new(numberOfChannels: number, length: number, sampleRate: number): OfflineAudioContext;
-};
-
-interface OscillatorNodeEventMap {
-    "ended": Event;
-}
-
-interface OscillatorNode extends AudioNode {
-    readonly detune: AudioParam;
-    readonly frequency: AudioParam;
-    onended: ((this: OscillatorNode, ev: Event) => any) | null;
-    type: OscillatorType;
-    setPeriodicWave(periodicWave: PeriodicWave): void;
-    start(when?: number): void;
-    stop(when?: number): void;
-    addEventListener<K extends keyof OscillatorNodeEventMap>(type: K, listener: (this: OscillatorNode, ev: OscillatorNodeEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof OscillatorNodeEventMap>(type: K, listener: (this: OscillatorNode, ev: OscillatorNodeEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var OscillatorNode: {
-    prototype: OscillatorNode;
-    new(): OscillatorNode;
-};
-
-interface OverflowEvent extends UIEvent {
-    readonly horizontalOverflow: boolean;
-    readonly orient: number;
-    readonly verticalOverflow: boolean;
-    readonly BOTH: number;
-    readonly HORIZONTAL: number;
-    readonly VERTICAL: number;
-}
-
-declare var OverflowEvent: {
-    prototype: OverflowEvent;
-    new(): OverflowEvent;
-    readonly BOTH: number;
-    readonly HORIZONTAL: number;
-    readonly VERTICAL: number;
-};
-
-interface PageTransitionEvent extends Event {
-    readonly persisted: boolean;
-}
-
-declare var PageTransitionEvent: {
-    prototype: PageTransitionEvent;
-    new(): PageTransitionEvent;
-};
-
-interface PannerNode extends AudioNode {
-    coneInnerAngle: number;
-    coneOuterAngle: number;
-    coneOuterGain: number;
-    distanceModel: DistanceModelType;
-    maxDistance: number;
-    panningModel: PanningModelType;
-    refDistance: number;
-    rolloffFactor: number;
-    /** @deprecated */
-    setOrientation(x: number, y: number, z: number): void;
-    /** @deprecated */
-    setPosition(x: number, y: number, z: number): void;
-    /** @deprecated */
-    setVelocity(x: number, y: number, z: number): void;
-}
-
-declare var PannerNode: {
-    prototype: PannerNode;
-    new(): PannerNode;
-};
-
-interface ParentNode {
-    readonly childElementCount: number;
-    readonly firstElementChild: Element | null;
-    readonly lastElementChild: Element | null;
-}
-
-interface ParentNode {
-    readonly children: HTMLCollection;
-    querySelector<K extends keyof HTMLElementTagNameMap>(selectors: K): HTMLElementTagNameMap[K] | null;
-    querySelector<K extends keyof SVGElementTagNameMap>(selectors: K): SVGElementTagNameMap[K] | null;
-    querySelector<E extends Element = Element>(selectors: string): E | null;
-    querySelectorAll<K extends keyof HTMLElementTagNameMap>(selectors: K): NodeListOf<HTMLElementTagNameMap[K]>;
-    querySelectorAll<K extends keyof SVGElementTagNameMap>(selectors: K): NodeListOf<SVGElementTagNameMap[K]>;
-    querySelectorAll<E extends Element = Element>(selectors: string): NodeListOf<E>;
-}
-
-interface Path2D extends CanvasPathMethods {
-}
-
-declare var Path2D: {
-    prototype: Path2D;
-    new(d?: Path2D | string): Path2D;
-};
-
-interface PaymentAddress {
-    readonly addressLine: string[];
-    readonly city: string;
-    readonly country: string;
-    readonly dependentLocality: string;
-    readonly languageCode: string;
-    readonly organization: string;
-    readonly phone: string;
-    readonly postalCode: string;
-    readonly recipient: string;
-    readonly region: string;
-    readonly sortingCode: string;
-    toJSON(): any;
-}
-
-declare var PaymentAddress: {
-    prototype: PaymentAddress;
-    new(): PaymentAddress;
-};
-
-interface PaymentRequestEventMap {
-    "shippingaddresschange": Event;
-    "shippingoptionchange": Event;
-}
-
-interface PaymentRequest extends EventTarget {
-    readonly id: string;
-    onshippingaddresschange: ((this: PaymentRequest, ev: Event) => any) | null;
-    onshippingoptionchange: ((this: PaymentRequest, ev: Event) => any) | null;
-    readonly shippingAddress: PaymentAddress | null;
-    readonly shippingOption: string | null;
-    readonly shippingType: PaymentShippingType | null;
-    abort(): Promise<void>;
-    canMakePayment(): Promise<boolean>;
-    show(): Promise<PaymentResponse>;
-    addEventListener<K extends keyof PaymentRequestEventMap>(type: K, listener: (this: PaymentRequest, ev: PaymentRequestEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof PaymentRequestEventMap>(type: K, listener: (this: PaymentRequest, ev: PaymentRequestEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var PaymentRequest: {
-    prototype: PaymentRequest;
-    new(methodData: PaymentMethodData[], details: PaymentDetailsInit, options?: PaymentOptions): PaymentRequest;
-};
-
-interface PaymentRequestUpdateEvent extends Event {
-    updateWith(detailsPromise: Promise<PaymentDetailsUpdate>): void;
-}
-
-declare var PaymentRequestUpdateEvent: {
-    prototype: PaymentRequestUpdateEvent;
-    new(type: string, eventInitDict?: PaymentRequestUpdateEventInit): PaymentRequestUpdateEvent;
-};
-
-interface PaymentResponse {
-    readonly details: any;
-    readonly methodName: string;
-    readonly payerEmail: string | null;
-    readonly payerName: string | null;
-    readonly payerPhone: string | null;
-    readonly requestId: string;
-    readonly shippingAddress: PaymentAddress | null;
-    readonly shippingOption: string | null;
-    complete(result?: PaymentComplete): Promise<void>;
-    toJSON(): any;
-}
-
-declare var PaymentResponse: {
-    prototype: PaymentResponse;
-    new(): PaymentResponse;
-};
-
-interface PerfWidgetExternal {
-    readonly activeNetworkRequestCount: number;
-    readonly averageFrameTime: number;
-    readonly averagePaintTime: number;
-    readonly extraInformationEnabled: boolean;
-    readonly independentRenderingEnabled: boolean;
-    readonly irDisablingContentString: string;
-    readonly irStatusAvailable: boolean;
-    readonly maxCpuSpeed: number;
-    readonly paintRequestsPerSecond: number;
-    readonly performanceCounter: number;
-    readonly performanceCounterFrequency: number;
-    addEventListener(eventType: string, callback: Function): void;
-    getMemoryUsage(): number;
-    getProcessCpuUsage(): number;
-    getRecentCpuUsage(last: number | null): any;
-    getRecentFrames(last: number | null): any;
-    getRecentMemoryUsage(last: number | null): any;
-    getRecentPaintRequests(last: number | null): any;
-    removeEventListener(eventType: string, callback: Function): void;
-    repositionWindow(x: number, y: number): void;
-    resizeWindow(width: number, height: number): void;
-}
-
-declare var PerfWidgetExternal: {
-    prototype: PerfWidgetExternal;
-    new(): PerfWidgetExternal;
-};
-
-interface Performance {
-    /** @deprecated */
-    readonly navigation: PerformanceNavigation;
-    readonly timeOrigin: number;
-    /** @deprecated */
-    readonly timing: PerformanceTiming;
-    clearMarks(markName?: string): void;
-    clearMeasures(measureName?: string): void;
-    clearResourceTimings(): void;
-    getEntries(): any;
-    getEntriesByName(name: string, type?: string): any;
-    getEntriesByType(type: string): any;
-    /** @deprecated */
-    getMarks(markName?: string): any;
-    /** @deprecated */
-    getMeasures(measureName?: string): any;
-    mark(markName: string): void;
-    measure(measureName: string, startMarkName?: string, endMarkName?: string): void;
-    now(): number;
-    setResourceTimingBufferSize(maxSize: number): void;
-    toJSON(): any;
-}
-
-declare var Performance: {
-    prototype: Performance;
-    new(): Performance;
-};
-
-interface PerformanceEntry {
-    readonly duration: number;
-    readonly entryType: string;
-    readonly name: string;
-    readonly startTime: number;
-    toJSON(): any;
-}
-
-declare var PerformanceEntry: {
-    prototype: PerformanceEntry;
-    new(): PerformanceEntry;
-};
-
-interface PerformanceMark extends PerformanceEntry {
-}
-
-declare var PerformanceMark: {
-    prototype: PerformanceMark;
-    new(): PerformanceMark;
-};
-
-interface PerformanceMeasure extends PerformanceEntry {
-}
-
-declare var PerformanceMeasure: {
-    prototype: PerformanceMeasure;
-    new(): PerformanceMeasure;
-};
-
-interface PerformanceNavigation {
-    readonly redirectCount: number;
-    readonly type: number;
-    toJSON(): any;
-    readonly TYPE_BACK_FORWARD: number;
-    readonly TYPE_NAVIGATE: number;
-    readonly TYPE_RELOAD: number;
-    readonly TYPE_RESERVED: number;
-}
-
-declare var PerformanceNavigation: {
-    prototype: PerformanceNavigation;
-    new(): PerformanceNavigation;
-    readonly TYPE_BACK_FORWARD: number;
-    readonly TYPE_NAVIGATE: number;
-    readonly TYPE_RELOAD: number;
-    readonly TYPE_RESERVED: number;
-};
-
-interface PerformanceNavigationTiming extends PerformanceEntry {
-    /** @deprecated */
-    readonly connectEnd: number;
-    /** @deprecated */
-    readonly connectStart: number;
-    readonly domComplete: number;
-    readonly domContentLoadedEventEnd: number;
-    readonly domContentLoadedEventStart: number;
-    readonly domInteractive: number;
-    /** @deprecated */
-    readonly domLoading: number;
-    /** @deprecated */
-    readonly domainLookupEnd: number;
-    /** @deprecated */
-    readonly domainLookupStart: number;
-    /** @deprecated */
-    readonly fetchStart: number;
-    readonly loadEventEnd: number;
-    readonly loadEventStart: number;
-    /** @deprecated */
-    readonly navigationStart: number;
-    readonly redirectCount: number;
-    /** @deprecated */
-    readonly redirectEnd: number;
-    /** @deprecated */
-    readonly redirectStart: number;
-    /** @deprecated */
-    readonly requestStart: number;
-    /** @deprecated */
-    readonly responseEnd: number;
-    /** @deprecated */
-    readonly responseStart: number;
-    readonly type: NavigationType;
-    readonly unloadEventEnd: number;
-    readonly unloadEventStart: number;
-    readonly workerStart: number;
-}
-
-declare var PerformanceNavigationTiming: {
-    prototype: PerformanceNavigationTiming;
-    new(): PerformanceNavigationTiming;
-};
-
-interface PerformanceResourceTiming extends PerformanceEntry {
-    readonly connectEnd: number;
-    readonly connectStart: number;
-    readonly domainLookupEnd: number;
-    readonly domainLookupStart: number;
-    readonly fetchStart: number;
-    readonly initiatorType: string;
-    readonly redirectEnd: number;
-    readonly redirectStart: number;
-    readonly requestStart: number;
-    readonly responseEnd: number;
-    readonly responseStart: number;
-    readonly workerStart: number;
-}
-
-declare var PerformanceResourceTiming: {
-    prototype: PerformanceResourceTiming;
-    new(): PerformanceResourceTiming;
-};
-
-interface PerformanceTiming {
-    readonly connectEnd: number;
-    readonly connectStart: number;
-    readonly domComplete: number;
-    readonly domContentLoadedEventEnd: number;
-    readonly domContentLoadedEventStart: number;
-    readonly domInteractive: number;
-    readonly domLoading: number;
-    readonly domainLookupEnd: number;
-    readonly domainLookupStart: number;
-    readonly fetchStart: number;
-    readonly loadEventEnd: number;
-    readonly loadEventStart: number;
-    readonly msFirstPaint: number;
-    readonly navigationStart: number;
-    readonly redirectEnd: number;
-    readonly redirectStart: number;
-    readonly requestStart: number;
-    readonly responseEnd: number;
-    readonly responseStart: number;
-    readonly secureConnectionStart: number;
-    readonly unloadEventEnd: number;
-    readonly unloadEventStart: number;
-    toJSON(): any;
-}
-
-declare var PerformanceTiming: {
-    prototype: PerformanceTiming;
-    new(): PerformanceTiming;
-};
-
-interface PeriodicWave {
-}
-
-declare var PeriodicWave: {
-    prototype: PeriodicWave;
-    new(): PeriodicWave;
-};
-
-interface PermissionRequest extends DeferredPermissionRequest {
-    readonly state: MSWebViewPermissionState;
-    defer(): void;
-}
-
-declare var PermissionRequest: {
-    prototype: PermissionRequest;
-    new(): PermissionRequest;
-};
-
-interface PermissionRequestedEvent extends Event {
-    readonly permissionRequest: PermissionRequest;
-}
-
-declare var PermissionRequestedEvent: {
-    prototype: PermissionRequestedEvent;
-    new(): PermissionRequestedEvent;
-};
-
-interface Plugin {
-    readonly description: string;
-    readonly filename: string;
-    readonly length: number;
-    readonly name: string;
-    readonly version: string;
-    item(index: number): MimeType;
-    namedItem(type: string): MimeType;
-    [index: number]: MimeType;
-}
-
-declare var Plugin: {
-    prototype: Plugin;
-    new(): Plugin;
-};
-
-interface PluginArray {
-    readonly length: number;
-    item(index: number): Plugin;
-    namedItem(name: string): Plugin;
-    refresh(reload?: boolean): void;
-    [index: number]: Plugin;
-}
-
-declare var PluginArray: {
-    prototype: PluginArray;
-    new(): PluginArray;
-};
-
-interface PointerEvent extends MouseEvent {
-    readonly currentPoint: any;
-    readonly height: number;
-    readonly hwTimestamp: number;
-    readonly intermediatePoints: any;
-    readonly isPrimary: boolean;
-    readonly pointerId: number;
-    readonly pointerType: any;
-    readonly pressure: number;
-    readonly rotation: number;
-    readonly tiltX: number;
-    readonly tiltY: number;
-    readonly width: number;
-    getCurrentPoint(element: Element): void;
-    getIntermediatePoints(element: Element): void;
-    initPointerEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number, screenXArg: number, screenYArg: number, clientXArg: number, clientYArg: number, ctrlKeyArg: boolean, altKeyArg: boolean, shiftKeyArg: boolean, metaKeyArg: boolean, buttonArg: number, relatedTargetArg: EventTarget, offsetXArg: number, offsetYArg: number, widthArg: number, heightArg: number, pressure: number, rotation: number, tiltX: number, tiltY: number, pointerIdArg: number, pointerType: any, hwTimestampArg: number, isPrimary: boolean): void;
-}
-
-declare var PointerEvent: {
-    prototype: PointerEvent;
-    new(typeArg: string, eventInitDict?: PointerEventInit): PointerEvent;
-};
-
-interface PopStateEvent extends Event {
-    readonly state: any;
-}
-
-declare var PopStateEvent: {
-    prototype: PopStateEvent;
-    new(type: string, eventInitDict?: PopStateEventInit): PopStateEvent;
-};
-
-interface Position {
-    readonly coords: Coordinates;
-    readonly timestamp: number;
-}
-
-declare var Position: {
-    prototype: Position;
-    new(): Position;
-};
-
-interface PositionError {
-    readonly code: number;
-    readonly message: string;
-    toString(): string;
-    readonly PERMISSION_DENIED: number;
-    readonly POSITION_UNAVAILABLE: number;
-    readonly TIMEOUT: number;
-}
-
-declare var PositionError: {
-    prototype: PositionError;
-    new(): PositionError;
-    readonly PERMISSION_DENIED: number;
-    readonly POSITION_UNAVAILABLE: number;
-    readonly TIMEOUT: number;
-};
-
-interface ProcessingInstruction extends CharacterData {
-    readonly target: string;
-}
-
-declare var ProcessingInstruction: {
-    prototype: ProcessingInstruction;
-    new(): ProcessingInstruction;
-};
-
-interface ProgressEvent extends Event {
-    readonly lengthComputable: boolean;
-    readonly loaded: number;
-    readonly total: number;
-    initProgressEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, lengthComputableArg: boolean, loadedArg: number, totalArg: number): void;
-}
-
-declare var ProgressEvent: {
-    prototype: ProgressEvent;
-    new(typeArg: string, eventInitDict?: ProgressEventInit): ProgressEvent;
-};
-
-interface PromiseRejectionEvent extends Event {
-    readonly promise: PromiseLike<any>;
-    readonly reason: any;
-}
-
-interface PromiseRejectionEventInit extends EventInit {
-    promise: PromiseLike<any>;
-    reason?: any;
-}
-
-interface PushManager {
-    readonly supportedContentEncodings: ReadonlyArray<string>;
-    getSubscription(): Promise<PushSubscription | null>;
-    permissionState(options?: PushSubscriptionOptionsInit): Promise<PushPermissionState>;
-    subscribe(options?: PushSubscriptionOptionsInit): Promise<PushSubscription>;
-}
-
-declare var PushManager: {
-    prototype: PushManager;
-    new(): PushManager;
-};
-
-interface PushSubscription {
-    readonly endpoint: string;
-    readonly expirationTime: number | null;
-    readonly options: PushSubscriptionOptions;
-    getKey(name: PushEncryptionKeyName): ArrayBuffer | null;
-    toJSON(): any;
-    unsubscribe(): Promise<boolean>;
-}
-
-declare var PushSubscription: {
-    prototype: PushSubscription;
-    new(): PushSubscription;
-};
-
-interface PushSubscriptionOptions {
-    readonly applicationServerKey: ArrayBuffer | null;
-    readonly userVisibleOnly: boolean;
-}
-
-declare var PushSubscriptionOptions: {
-    prototype: PushSubscriptionOptions;
-    new(): PushSubscriptionOptions;
-};
-
-interface RTCDTMFToneChangeEvent extends Event {
-    readonly tone: string;
-}
-
-declare var RTCDTMFToneChangeEvent: {
-    prototype: RTCDTMFToneChangeEvent;
-    new(typeArg: string, eventInitDict: RTCDTMFToneChangeEventInit): RTCDTMFToneChangeEvent;
-};
-
-interface RTCDtlsTransportEventMap {
-    "dtlsstatechange": RTCDtlsTransportStateChangedEvent;
-    "error": Event;
-}
-
-interface RTCDtlsTransport extends RTCStatsProvider {
-    ondtlsstatechange: ((this: RTCDtlsTransport, ev: RTCDtlsTransportStateChangedEvent) => any) | null;
-    onerror: ((this: RTCDtlsTransport, ev: Event) => any) | null;
-    readonly state: RTCDtlsTransportState;
-    readonly transport: RTCIceTransport;
-    getLocalParameters(): RTCDtlsParameters;
-    getRemoteCertificates(): ArrayBuffer[];
-    getRemoteParameters(): RTCDtlsParameters | null;
-    start(remoteParameters: RTCDtlsParameters): void;
-    stop(): void;
-    addEventListener<K extends keyof RTCDtlsTransportEventMap>(type: K, listener: (this: RTCDtlsTransport, ev: RTCDtlsTransportEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCDtlsTransportEventMap>(type: K, listener: (this: RTCDtlsTransport, ev: RTCDtlsTransportEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var RTCDtlsTransport: {
-    prototype: RTCDtlsTransport;
-    new(transport: RTCIceTransport): RTCDtlsTransport;
-};
-
-interface RTCDtlsTransportStateChangedEvent extends Event {
-    readonly state: RTCDtlsTransportState;
-}
-
-declare var RTCDtlsTransportStateChangedEvent: {
-    prototype: RTCDtlsTransportStateChangedEvent;
-    new(): RTCDtlsTransportStateChangedEvent;
-};
-
-interface RTCDtmfSenderEventMap {
-    "tonechange": RTCDTMFToneChangeEvent;
-}
-
-interface RTCDtmfSender extends EventTarget {
-    readonly canInsertDTMF: boolean;
-    readonly duration: number;
-    readonly interToneGap: number;
-    ontonechange: ((this: RTCDtmfSender, ev: RTCDTMFToneChangeEvent) => any) | null;
-    readonly sender: RTCRtpSender;
-    readonly toneBuffer: string;
-    insertDTMF(tones: string, duration?: number, interToneGap?: number): void;
-    addEventListener<K extends keyof RTCDtmfSenderEventMap>(type: K, listener: (this: RTCDtmfSender, ev: RTCDtmfSenderEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCDtmfSenderEventMap>(type: K, listener: (this: RTCDtmfSender, ev: RTCDtmfSenderEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var RTCDtmfSender: {
-    prototype: RTCDtmfSender;
-    new(sender: RTCRtpSender): RTCDtmfSender;
-};
-
-interface RTCIceCandidate {
-    candidate: string | null;
-    sdpMLineIndex: number | null;
-    sdpMid: string | null;
-    toJSON(): any;
-}
-
-declare var RTCIceCandidate: {
-    prototype: RTCIceCandidate;
-    new(candidateInitDict?: RTCIceCandidateInit): RTCIceCandidate;
-};
-
-interface RTCIceCandidatePairChangedEvent extends Event {
-    readonly pair: RTCIceCandidatePair;
-}
-
-declare var RTCIceCandidatePairChangedEvent: {
-    prototype: RTCIceCandidatePairChangedEvent;
-    new(): RTCIceCandidatePairChangedEvent;
-};
-
-interface RTCIceGathererEventMap {
-    "error": Event;
-    "localcandidate": RTCIceGathererEvent;
-}
-
-interface RTCIceGatherer extends RTCStatsProvider {
-    readonly component: RTCIceComponent;
-    onerror: ((this: RTCIceGatherer, ev: Event) => any) | null;
-    onlocalcandidate: ((this: RTCIceGatherer, ev: RTCIceGathererEvent) => any) | null;
-    createAssociatedGatherer(): RTCIceGatherer;
-    getLocalCandidates(): RTCIceCandidateDictionary[];
-    getLocalParameters(): RTCIceParameters;
-    addEventListener<K extends keyof RTCIceGathererEventMap>(type: K, listener: (this: RTCIceGatherer, ev: RTCIceGathererEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCIceGathererEventMap>(type: K, listener: (this: RTCIceGatherer, ev: RTCIceGathererEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var RTCIceGatherer: {
-    prototype: RTCIceGatherer;
-    new(options: RTCIceGatherOptions): RTCIceGatherer;
-};
-
-interface RTCIceGathererEvent extends Event {
-    readonly candidate: RTCIceCandidateDictionary | RTCIceCandidateComplete;
-}
-
-declare var RTCIceGathererEvent: {
-    prototype: RTCIceGathererEvent;
-    new(): RTCIceGathererEvent;
-};
-
-interface RTCIceTransportEventMap {
-    "candidatepairchange": RTCIceCandidatePairChangedEvent;
-    "icestatechange": RTCIceTransportStateChangedEvent;
-}
-
-interface RTCIceTransport extends RTCStatsProvider {
-    readonly component: RTCIceComponent;
-    readonly iceGatherer: RTCIceGatherer | null;
-    oncandidatepairchange: ((this: RTCIceTransport, ev: RTCIceCandidatePairChangedEvent) => any) | null;
-    onicestatechange: ((this: RTCIceTransport, ev: RTCIceTransportStateChangedEvent) => any) | null;
-    readonly role: RTCIceRole;
-    readonly state: RTCIceTransportState;
-    addRemoteCandidate(remoteCandidate: RTCIceCandidateDictionary | RTCIceCandidateComplete): void;
-    createAssociatedTransport(): RTCIceTransport;
-    getNominatedCandidatePair(): RTCIceCandidatePair | null;
-    getRemoteCandidates(): RTCIceCandidateDictionary[];
-    getRemoteParameters(): RTCIceParameters | null;
-    setRemoteCandidates(remoteCandidates: RTCIceCandidateDictionary[]): void;
-    start(gatherer: RTCIceGatherer, remoteParameters: RTCIceParameters, role?: RTCIceRole): void;
-    stop(): void;
-    addEventListener<K extends keyof RTCIceTransportEventMap>(type: K, listener: (this: RTCIceTransport, ev: RTCIceTransportEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCIceTransportEventMap>(type: K, listener: (this: RTCIceTransport, ev: RTCIceTransportEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var RTCIceTransport: {
-    prototype: RTCIceTransport;
-    new(): RTCIceTransport;
-};
-
-interface RTCIceTransportStateChangedEvent extends Event {
-    readonly state: RTCIceTransportState;
-}
-
-declare var RTCIceTransportStateChangedEvent: {
-    prototype: RTCIceTransportStateChangedEvent;
-    new(): RTCIceTransportStateChangedEvent;
-};
-
-interface RTCPeerConnectionEventMap {
-    "addstream": MediaStreamEvent;
-    "icecandidate": RTCPeerConnectionIceEvent;
-    "iceconnectionstatechange": Event;
-    "icegatheringstatechange": Event;
-    "negotiationneeded": Event;
-    "removestream": MediaStreamEvent;
-    "signalingstatechange": Event;
-}
-
-interface RTCPeerConnection extends EventTarget {
-    readonly canTrickleIceCandidates: boolean | null;
-    readonly iceConnectionState: RTCIceConnectionState;
-    readonly iceGatheringState: RTCIceGatheringState;
-    readonly localDescription: RTCSessionDescription | null;
-    onaddstream: ((this: RTCPeerConnection, ev: MediaStreamEvent) => any) | null;
-    onicecandidate: ((this: RTCPeerConnection, ev: RTCPeerConnectionIceEvent) => any) | null;
-    oniceconnectionstatechange: ((this: RTCPeerConnection, ev: Event) => any) | null;
-    onicegatheringstatechange: ((this: RTCPeerConnection, ev: Event) => any) | null;
-    onnegotiationneeded: ((this: RTCPeerConnection, ev: Event) => any) | null;
-    onremovestream: ((this: RTCPeerConnection, ev: MediaStreamEvent) => any) | null;
-    onsignalingstatechange: ((this: RTCPeerConnection, ev: Event) => any) | null;
-    readonly remoteDescription: RTCSessionDescription | null;
-    readonly signalingState: RTCSignalingState;
-    addIceCandidate(candidate: RTCIceCandidateInit | RTCIceCandidate): Promise<void>;
-    addStream(stream: MediaStream): void;
-    close(): void;
-    createAnswer(options?: RTCOfferOptions): Promise<RTCSessionDescriptionInit>;
-    createOffer(options?: RTCOfferOptions): Promise<RTCSessionDescriptionInit>;
-    getConfiguration(): RTCConfiguration;
-    getLocalStreams(): MediaStream[];
-    getRemoteStreams(): MediaStream[];
-    getStats(selector: MediaStreamTrack | null, successCallback?: RTCStatsCallback, failureCallback?: RTCPeerConnectionErrorCallback): Promise<RTCStatsReport>;
-    getStreamById(streamId: string): MediaStream | null;
-    removeStream(stream: MediaStream): void;
-    setLocalDescription(description: RTCSessionDescriptionInit): Promise<void>;
-    setRemoteDescription(description: RTCSessionDescriptionInit): Promise<void>;
-    addEventListener<K extends keyof RTCPeerConnectionEventMap>(type: K, listener: (this: RTCPeerConnection, ev: RTCPeerConnectionEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCPeerConnectionEventMap>(type: K, listener: (this: RTCPeerConnection, ev: RTCPeerConnectionEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var RTCPeerConnection: {
-    prototype: RTCPeerConnection;
-    new(configuration: RTCConfiguration): RTCPeerConnection;
-};
-
-interface RTCPeerConnectionIceEvent extends Event {
-    readonly candidate: RTCIceCandidate;
-}
-
-declare var RTCPeerConnectionIceEvent: {
-    prototype: RTCPeerConnectionIceEvent;
-    new(type: string, eventInitDict: RTCPeerConnectionIceEventInit): RTCPeerConnectionIceEvent;
-};
-
-interface RTCRtpReceiverEventMap {
-    "error": Event;
-    "msdecodercapacitychange": Event;
-    "msdsh": Event;
-}
-
-interface RTCRtpReceiver extends RTCStatsProvider {
-    onerror: ((this: RTCRtpReceiver, ev: Event) => any) | null;
-    onmsdecodercapacitychange: ((this: RTCRtpReceiver, ev: Event) => any) | null;
-    onmsdsh: ((this: RTCRtpReceiver, ev: Event) => any) | null;
-    readonly rtcpTransport: RTCDtlsTransport;
-    readonly track: MediaStreamTrack | null;
-    readonly transport: RTCDtlsTransport | RTCSrtpSdesTransport;
-    getContributingSources(): RTCRtpContributingSource[];
-    receive(parameters: RTCRtpParameters): void;
-    requestSendCSRC(csrc: number): void;
-    setTransport(transport: RTCDtlsTransport | RTCSrtpSdesTransport, rtcpTransport?: RTCDtlsTransport): void;
-    stop(): void;
-    addEventListener<K extends keyof RTCRtpReceiverEventMap>(type: K, listener: (this: RTCRtpReceiver, ev: RTCRtpReceiverEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCRtpReceiverEventMap>(type: K, listener: (this: RTCRtpReceiver, ev: RTCRtpReceiverEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var RTCRtpReceiver: {
-    prototype: RTCRtpReceiver;
-    new(transport: RTCDtlsTransport | RTCSrtpSdesTransport, kind: string, rtcpTransport?: RTCDtlsTransport): RTCRtpReceiver;
-    getCapabilities(kind?: string): RTCRtpCapabilities;
-};
-
-interface RTCRtpSenderEventMap {
-    "error": Event;
-    "ssrcconflict": RTCSsrcConflictEvent;
-}
-
-interface RTCRtpSender extends RTCStatsProvider {
-    onerror: ((this: RTCRtpSender, ev: Event) => any) | null;
-    onssrcconflict: ((this: RTCRtpSender, ev: RTCSsrcConflictEvent) => any) | null;
-    readonly rtcpTransport: RTCDtlsTransport;
-    readonly track: MediaStreamTrack;
-    readonly transport: RTCDtlsTransport | RTCSrtpSdesTransport;
-    send(parameters: RTCRtpParameters): void;
-    setTrack(track: MediaStreamTrack): void;
-    setTransport(transport: RTCDtlsTransport | RTCSrtpSdesTransport, rtcpTransport?: RTCDtlsTransport): void;
-    stop(): void;
-    addEventListener<K extends keyof RTCRtpSenderEventMap>(type: K, listener: (this: RTCRtpSender, ev: RTCRtpSenderEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCRtpSenderEventMap>(type: K, listener: (this: RTCRtpSender, ev: RTCRtpSenderEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var RTCRtpSender: {
-    prototype: RTCRtpSender;
-    new(track: MediaStreamTrack, transport: RTCDtlsTransport | RTCSrtpSdesTransport, rtcpTransport?: RTCDtlsTransport): RTCRtpSender;
-    getCapabilities(kind?: string): RTCRtpCapabilities;
-};
-
-interface RTCSessionDescription {
-    sdp: string | null;
-    type: RTCSdpType | null;
-    toJSON(): any;
-}
-
-declare var RTCSessionDescription: {
-    prototype: RTCSessionDescription;
-    new(descriptionInitDict?: RTCSessionDescriptionInit): RTCSessionDescription;
-};
-
-interface RTCSrtpSdesTransportEventMap {
-    "error": Event;
-}
-
-interface RTCSrtpSdesTransport extends EventTarget {
-    onerror: ((this: RTCSrtpSdesTransport, ev: Event) => any) | null;
-    readonly transport: RTCIceTransport;
-    addEventListener<K extends keyof RTCSrtpSdesTransportEventMap>(type: K, listener: (this: RTCSrtpSdesTransport, ev: RTCSrtpSdesTransportEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCSrtpSdesTransportEventMap>(type: K, listener: (this: RTCSrtpSdesTransport, ev: RTCSrtpSdesTransportEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var RTCSrtpSdesTransport: {
-    prototype: RTCSrtpSdesTransport;
-    new(transport: RTCIceTransport, encryptParameters: RTCSrtpSdesParameters, decryptParameters: RTCSrtpSdesParameters): RTCSrtpSdesTransport;
-    getLocalParameters(): RTCSrtpSdesParameters[];
-};
-
-interface RTCSsrcConflictEvent extends Event {
-    readonly ssrc: number;
-}
-
-declare var RTCSsrcConflictEvent: {
-    prototype: RTCSsrcConflictEvent;
-    new(): RTCSsrcConflictEvent;
-};
-
-interface RTCStatsProvider extends EventTarget {
-    getStats(): Promise<RTCStatsReport>;
-    msGetStats(): Promise<RTCStatsReport>;
-}
-
-declare var RTCStatsProvider: {
-    prototype: RTCStatsProvider;
-    new(): RTCStatsProvider;
-};
-
-interface RandomSource {
-    getRandomValues<T extends Int8Array | Uint8ClampedArray | Uint8Array | Int16Array | Uint16Array | Int32Array | Uint32Array>(array: T): T;
-}
-
-declare var RandomSource: {
-    prototype: RandomSource;
-    new(): RandomSource;
-};
-
-interface Range {
-    readonly collapsed: boolean;
-    readonly commonAncestorContainer: Node;
-    readonly endContainer: Node;
-    readonly endOffset: number;
-    readonly startContainer: Node;
-    readonly startOffset: number;
-    cloneContents(): DocumentFragment;
-    cloneRange(): Range;
-    collapse(toStart?: boolean): void;
-    compareBoundaryPoints(how: number, sourceRange: Range): number;
-    createContextualFragment(fragment: string): DocumentFragment;
-    deleteContents(): void;
-    detach(): void;
-    expand(Unit: ExpandGranularity): boolean;
-    extractContents(): DocumentFragment;
-    getBoundingClientRect(): ClientRect | DOMRect;
-    getClientRects(): ClientRectList | DOMRectList;
-    insertNode(node: Node): void;
-    isPointInRange(node: Node, offset: number): boolean;
-    selectNode(node: Node): void;
-    selectNodeContents(node: Node): void;
-    setEnd(node: Node, offset: number): void;
-    setEndAfter(node: Node): void;
-    setEndBefore(node: Node): void;
-    setStart(node: Node, offset: number): void;
-    setStartAfter(node: Node): void;
-    setStartBefore(node: Node): void;
-    surroundContents(newParent: Node): void;
-    toString(): string;
-    readonly END_TO_END: number;
-    readonly END_TO_START: number;
-    readonly START_TO_END: number;
-    readonly START_TO_START: number;
-}
-
-declare var Range: {
-    prototype: Range;
-    new(): Range;
-    readonly END_TO_END: number;
-    readonly END_TO_START: number;
-    readonly START_TO_END: number;
-    readonly START_TO_START: number;
-};
-
-interface ReadableStream {
-    readonly locked: boolean;
-    cancel(): Promise<void>;
-    getReader(): ReadableStreamReader;
-}
-
-declare var ReadableStream: {
-    prototype: ReadableStream;
-    new(): ReadableStream;
-};
-
-interface ReadableStreamReader {
-    cancel(): Promise<void>;
-    read(): Promise<any>;
-    releaseLock(): void;
-}
-
-declare var ReadableStreamReader: {
-    prototype: ReadableStreamReader;
-    new(): ReadableStreamReader;
-};
-
-interface Request extends Body {
-    readonly cache: RequestCache;
-    readonly credentials: RequestCredentials;
-    readonly destination: RequestDestination;
-    readonly headers: Headers;
-    readonly integrity: string;
-    readonly keepalive: boolean;
-    readonly method: string;
-    readonly mode: RequestMode;
-    readonly redirect: RequestRedirect;
-    readonly referrer: string;
-    readonly referrerPolicy: ReferrerPolicy;
-    readonly signal: AbortSignal | null;
-    readonly type: RequestType;
-    readonly url: string;
-    clone(): Request;
-}
-
-declare var Request: {
-    prototype: Request;
-    new(input: Request | string, init?: RequestInit): Request;
-};
-
-interface Response extends Body {
-    readonly body: ReadableStream | null;
-    readonly headers: Headers;
-    readonly ok: boolean;
-    readonly redirected: boolean;
-    readonly status: number;
-    readonly statusText: string;
-    readonly type: ResponseType;
-    readonly url: string;
-    clone(): Response;
-}
-
-declare var Response: {
-    prototype: Response;
-    new(body?: Blob | Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | FormData | string | null, init?: ResponseInit): Response;
-    error(): Response;
-    redirect(url: string, status?: number): Response;
-};
-
-interface SVGAElement extends SVGGraphicsElement, SVGURIReference {
-    readonly target: SVGAnimatedString;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGAElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGAElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGAElement: {
-    prototype: SVGAElement;
-    new(): SVGAElement;
-};
-
-interface SVGAngle {
-    readonly unitType: number;
-    value: number;
-    valueAsString: string;
-    valueInSpecifiedUnits: number;
-    convertToSpecifiedUnits(unitType: number): void;
-    newValueSpecifiedUnits(unitType: number, valueInSpecifiedUnits: number): void;
-    readonly SVG_ANGLETYPE_DEG: number;
-    readonly SVG_ANGLETYPE_GRAD: number;
-    readonly SVG_ANGLETYPE_RAD: number;
-    readonly SVG_ANGLETYPE_UNKNOWN: number;
-    readonly SVG_ANGLETYPE_UNSPECIFIED: number;
-}
-
-declare var SVGAngle: {
-    prototype: SVGAngle;
-    new(): SVGAngle;
-    readonly SVG_ANGLETYPE_DEG: number;
-    readonly SVG_ANGLETYPE_GRAD: number;
-    readonly SVG_ANGLETYPE_RAD: number;
-    readonly SVG_ANGLETYPE_UNKNOWN: number;
-    readonly SVG_ANGLETYPE_UNSPECIFIED: number;
-};
-
-interface SVGAnimatedAngle {
-    readonly animVal: SVGAngle;
-    readonly baseVal: SVGAngle;
-}
-
-declare var SVGAnimatedAngle: {
-    prototype: SVGAnimatedAngle;
-    new(): SVGAnimatedAngle;
-};
-
-interface SVGAnimatedBoolean {
-    readonly animVal: boolean;
-    baseVal: boolean;
-}
-
-declare var SVGAnimatedBoolean: {
-    prototype: SVGAnimatedBoolean;
-    new(): SVGAnimatedBoolean;
-};
-
-interface SVGAnimatedEnumeration {
-    readonly animVal: number;
-    baseVal: number;
-}
-
-declare var SVGAnimatedEnumeration: {
-    prototype: SVGAnimatedEnumeration;
-    new(): SVGAnimatedEnumeration;
-};
-
-interface SVGAnimatedInteger {
-    readonly animVal: number;
-    baseVal: number;
-}
-
-declare var SVGAnimatedInteger: {
-    prototype: SVGAnimatedInteger;
-    new(): SVGAnimatedInteger;
-};
-
-interface SVGAnimatedLength {
-    readonly animVal: SVGLength;
-    readonly baseVal: SVGLength;
-}
-
-declare var SVGAnimatedLength: {
-    prototype: SVGAnimatedLength;
-    new(): SVGAnimatedLength;
-};
-
-interface SVGAnimatedLengthList {
-    readonly animVal: SVGLengthList;
-    readonly baseVal: SVGLengthList;
-}
-
-declare var SVGAnimatedLengthList: {
-    prototype: SVGAnimatedLengthList;
-    new(): SVGAnimatedLengthList;
-};
-
-interface SVGAnimatedNumber {
-    readonly animVal: number;
-    baseVal: number;
-}
-
-declare var SVGAnimatedNumber: {
-    prototype: SVGAnimatedNumber;
-    new(): SVGAnimatedNumber;
-};
-
-interface SVGAnimatedNumberList {
-    readonly animVal: SVGNumberList;
-    readonly baseVal: SVGNumberList;
-}
-
-declare var SVGAnimatedNumberList: {
-    prototype: SVGAnimatedNumberList;
-    new(): SVGAnimatedNumberList;
-};
-
-interface SVGAnimatedPoints {
-    readonly animatedPoints: SVGPointList;
-    readonly points: SVGPointList;
-}
-
-interface SVGAnimatedPreserveAspectRatio {
-    readonly animVal: SVGPreserveAspectRatio;
-    readonly baseVal: SVGPreserveAspectRatio;
-}
-
-declare var SVGAnimatedPreserveAspectRatio: {
-    prototype: SVGAnimatedPreserveAspectRatio;
-    new(): SVGAnimatedPreserveAspectRatio;
-};
-
-interface SVGAnimatedRect {
-    readonly animVal: SVGRect;
-    readonly baseVal: SVGRect;
-}
-
-declare var SVGAnimatedRect: {
-    prototype: SVGAnimatedRect;
-    new(): SVGAnimatedRect;
-};
-
-interface SVGAnimatedString {
-    readonly animVal: string;
-    baseVal: string;
-}
-
-declare var SVGAnimatedString: {
-    prototype: SVGAnimatedString;
-    new(): SVGAnimatedString;
-};
-
-interface SVGAnimatedTransformList {
-    readonly animVal: SVGTransformList;
-    readonly baseVal: SVGTransformList;
-}
-
-declare var SVGAnimatedTransformList: {
-    prototype: SVGAnimatedTransformList;
-    new(): SVGAnimatedTransformList;
-};
-
-interface SVGCircleElement extends SVGGraphicsElement {
-    readonly cx: SVGAnimatedLength;
-    readonly cy: SVGAnimatedLength;
-    readonly r: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGCircleElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGCircleElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGCircleElement: {
-    prototype: SVGCircleElement;
-    new(): SVGCircleElement;
-};
-
-interface SVGClipPathElement extends SVGGraphicsElement, SVGUnitTypes {
-    readonly clipPathUnits: SVGAnimatedEnumeration;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGClipPathElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGClipPathElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGClipPathElement: {
-    prototype: SVGClipPathElement;
-    new(): SVGClipPathElement;
-};
-
-interface SVGComponentTransferFunctionElement extends SVGElement {
-    readonly amplitude: SVGAnimatedNumber;
-    readonly exponent: SVGAnimatedNumber;
-    readonly intercept: SVGAnimatedNumber;
-    readonly offset: SVGAnimatedNumber;
-    readonly slope: SVGAnimatedNumber;
-    readonly tableValues: SVGAnimatedNumberList;
-    readonly type: SVGAnimatedEnumeration;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_DISCRETE: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_GAMMA: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_IDENTITY: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_LINEAR: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_TABLE: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGComponentTransferFunctionElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGComponentTransferFunctionElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGComponentTransferFunctionElement: {
-    prototype: SVGComponentTransferFunctionElement;
-    new(): SVGComponentTransferFunctionElement;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_DISCRETE: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_GAMMA: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_IDENTITY: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_LINEAR: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_TABLE: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_UNKNOWN: number;
-};
-
-interface SVGDefsElement extends SVGGraphicsElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGDefsElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGDefsElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGDefsElement: {
-    prototype: SVGDefsElement;
-    new(): SVGDefsElement;
-};
-
-interface SVGDescElement extends SVGElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGDescElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGDescElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGDescElement: {
-    prototype: SVGDescElement;
-    new(): SVGDescElement;
-};
-
-interface SVGElementEventMap extends ElementEventMap {
-    "click": MouseEvent;
-    "dblclick": MouseEvent;
-    "focusin": FocusEvent;
-    "focusout": FocusEvent;
-    "load": Event;
-    "mousedown": MouseEvent;
-    "mousemove": MouseEvent;
-    "mouseout": MouseEvent;
-    "mouseover": MouseEvent;
-    "mouseup": MouseEvent;
-}
-
-interface SVGElement extends Element, ElementCSSInlineStyle {
-    readonly className: any;
-    onclick: ((this: SVGElement, ev: MouseEvent) => any) | null;
-    ondblclick: ((this: SVGElement, ev: MouseEvent) => any) | null;
-    onfocusin: ((this: SVGElement, ev: FocusEvent) => any) | null;
-    onfocusout: ((this: SVGElement, ev: FocusEvent) => any) | null;
-    onload: ((this: SVGElement, ev: Event) => any) | null;
-    onmousedown: ((this: SVGElement, ev: MouseEvent) => any) | null;
-    onmousemove: ((this: SVGElement, ev: MouseEvent) => any) | null;
-    onmouseout: ((this: SVGElement, ev: MouseEvent) => any) | null;
-    onmouseover: ((this: SVGElement, ev: MouseEvent) => any) | null;
-    onmouseup: ((this: SVGElement, ev: MouseEvent) => any) | null;
-    readonly ownerSVGElement: SVGSVGElement | null;
-    readonly viewportElement: SVGElement | null;
-    /** @deprecated */
-    xmlbase: string;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGElement: {
-    prototype: SVGElement;
-    new(): SVGElement;
-};
-
-interface SVGElementInstance extends EventTarget {
-    readonly childNodes: SVGElementInstanceList;
-    readonly correspondingElement: SVGElement;
-    readonly correspondingUseElement: SVGUseElement;
-    readonly firstChild: SVGElementInstance;
-    readonly lastChild: SVGElementInstance;
-    readonly nextSibling: SVGElementInstance;
-    readonly parentNode: SVGElementInstance;
-    readonly previousSibling: SVGElementInstance;
-}
-
-declare var SVGElementInstance: {
-    prototype: SVGElementInstance;
-    new(): SVGElementInstance;
-};
-
-interface SVGElementInstanceList {
-    /** @deprecated */
-    readonly length: number;
-    /** @deprecated */
-    item(index: number): SVGElementInstance;
-}
-
-declare var SVGElementInstanceList: {
-    prototype: SVGElementInstanceList;
-    new(): SVGElementInstanceList;
-};
-
-interface SVGEllipseElement extends SVGGraphicsElement {
-    readonly cx: SVGAnimatedLength;
-    readonly cy: SVGAnimatedLength;
-    readonly rx: SVGAnimatedLength;
-    readonly ry: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGEllipseElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGEllipseElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGEllipseElement: {
-    prototype: SVGEllipseElement;
-    new(): SVGEllipseElement;
-};
-
-interface SVGFEBlendElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    readonly in2: SVGAnimatedString;
-    readonly mode: SVGAnimatedEnumeration;
-    readonly SVG_FEBLEND_MODE_COLOR: number;
-    readonly SVG_FEBLEND_MODE_COLOR_BURN: number;
-    readonly SVG_FEBLEND_MODE_COLOR_DODGE: number;
-    readonly SVG_FEBLEND_MODE_DARKEN: number;
-    readonly SVG_FEBLEND_MODE_DIFFERENCE: number;
-    readonly SVG_FEBLEND_MODE_EXCLUSION: number;
-    readonly SVG_FEBLEND_MODE_HARD_LIGHT: number;
-    readonly SVG_FEBLEND_MODE_HUE: number;
-    readonly SVG_FEBLEND_MODE_LIGHTEN: number;
-    readonly SVG_FEBLEND_MODE_LUMINOSITY: number;
-    readonly SVG_FEBLEND_MODE_MULTIPLY: number;
-    readonly SVG_FEBLEND_MODE_NORMAL: number;
-    readonly SVG_FEBLEND_MODE_OVERLAY: number;
-    readonly SVG_FEBLEND_MODE_SATURATION: number;
-    readonly SVG_FEBLEND_MODE_SCREEN: number;
-    readonly SVG_FEBLEND_MODE_SOFT_LIGHT: number;
-    readonly SVG_FEBLEND_MODE_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEBlendElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEBlendElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEBlendElement: {
-    prototype: SVGFEBlendElement;
-    new(): SVGFEBlendElement;
-    readonly SVG_FEBLEND_MODE_COLOR: number;
-    readonly SVG_FEBLEND_MODE_COLOR_BURN: number;
-    readonly SVG_FEBLEND_MODE_COLOR_DODGE: number;
-    readonly SVG_FEBLEND_MODE_DARKEN: number;
-    readonly SVG_FEBLEND_MODE_DIFFERENCE: number;
-    readonly SVG_FEBLEND_MODE_EXCLUSION: number;
-    readonly SVG_FEBLEND_MODE_HARD_LIGHT: number;
-    readonly SVG_FEBLEND_MODE_HUE: number;
-    readonly SVG_FEBLEND_MODE_LIGHTEN: number;
-    readonly SVG_FEBLEND_MODE_LUMINOSITY: number;
-    readonly SVG_FEBLEND_MODE_MULTIPLY: number;
-    readonly SVG_FEBLEND_MODE_NORMAL: number;
-    readonly SVG_FEBLEND_MODE_OVERLAY: number;
-    readonly SVG_FEBLEND_MODE_SATURATION: number;
-    readonly SVG_FEBLEND_MODE_SCREEN: number;
-    readonly SVG_FEBLEND_MODE_SOFT_LIGHT: number;
-    readonly SVG_FEBLEND_MODE_UNKNOWN: number;
-};
-
-interface SVGFEColorMatrixElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    readonly type: SVGAnimatedEnumeration;
-    readonly values: SVGAnimatedNumberList;
-    readonly SVG_FECOLORMATRIX_TYPE_HUEROTATE: number;
-    readonly SVG_FECOLORMATRIX_TYPE_LUMINANCETOALPHA: number;
-    readonly SVG_FECOLORMATRIX_TYPE_MATRIX: number;
-    readonly SVG_FECOLORMATRIX_TYPE_SATURATE: number;
-    readonly SVG_FECOLORMATRIX_TYPE_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEColorMatrixElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEColorMatrixElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEColorMatrixElement: {
-    prototype: SVGFEColorMatrixElement;
-    new(): SVGFEColorMatrixElement;
-    readonly SVG_FECOLORMATRIX_TYPE_HUEROTATE: number;
-    readonly SVG_FECOLORMATRIX_TYPE_LUMINANCETOALPHA: number;
-    readonly SVG_FECOLORMATRIX_TYPE_MATRIX: number;
-    readonly SVG_FECOLORMATRIX_TYPE_SATURATE: number;
-    readonly SVG_FECOLORMATRIX_TYPE_UNKNOWN: number;
-};
-
-interface SVGFEComponentTransferElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEComponentTransferElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEComponentTransferElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEComponentTransferElement: {
-    prototype: SVGFEComponentTransferElement;
-    new(): SVGFEComponentTransferElement;
-};
-
-interface SVGFECompositeElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    readonly in2: SVGAnimatedString;
-    readonly k1: SVGAnimatedNumber;
-    readonly k2: SVGAnimatedNumber;
-    readonly k3: SVGAnimatedNumber;
-    readonly k4: SVGAnimatedNumber;
-    readonly operator: SVGAnimatedEnumeration;
-    readonly SVG_FECOMPOSITE_OPERATOR_ARITHMETIC: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_ATOP: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_IN: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_OUT: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_OVER: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_UNKNOWN: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_XOR: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFECompositeElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFECompositeElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFECompositeElement: {
-    prototype: SVGFECompositeElement;
-    new(): SVGFECompositeElement;
-    readonly SVG_FECOMPOSITE_OPERATOR_ARITHMETIC: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_ATOP: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_IN: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_OUT: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_OVER: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_UNKNOWN: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_XOR: number;
-};
-
-interface SVGFEConvolveMatrixElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly bias: SVGAnimatedNumber;
-    readonly divisor: SVGAnimatedNumber;
-    readonly edgeMode: SVGAnimatedEnumeration;
-    readonly in1: SVGAnimatedString;
-    readonly kernelMatrix: SVGAnimatedNumberList;
-    readonly kernelUnitLengthX: SVGAnimatedNumber;
-    readonly kernelUnitLengthY: SVGAnimatedNumber;
-    readonly orderX: SVGAnimatedInteger;
-    readonly orderY: SVGAnimatedInteger;
-    readonly preserveAlpha: SVGAnimatedBoolean;
-    readonly targetX: SVGAnimatedInteger;
-    readonly targetY: SVGAnimatedInteger;
-    readonly SVG_EDGEMODE_DUPLICATE: number;
-    readonly SVG_EDGEMODE_NONE: number;
-    readonly SVG_EDGEMODE_UNKNOWN: number;
-    readonly SVG_EDGEMODE_WRAP: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEConvolveMatrixElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEConvolveMatrixElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEConvolveMatrixElement: {
-    prototype: SVGFEConvolveMatrixElement;
-    new(): SVGFEConvolveMatrixElement;
-    readonly SVG_EDGEMODE_DUPLICATE: number;
-    readonly SVG_EDGEMODE_NONE: number;
-    readonly SVG_EDGEMODE_UNKNOWN: number;
-    readonly SVG_EDGEMODE_WRAP: number;
-};
-
-interface SVGFEDiffuseLightingElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly diffuseConstant: SVGAnimatedNumber;
-    readonly in1: SVGAnimatedString;
-    readonly kernelUnitLengthX: SVGAnimatedNumber;
-    readonly kernelUnitLengthY: SVGAnimatedNumber;
-    readonly surfaceScale: SVGAnimatedNumber;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEDiffuseLightingElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEDiffuseLightingElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEDiffuseLightingElement: {
-    prototype: SVGFEDiffuseLightingElement;
-    new(): SVGFEDiffuseLightingElement;
-};
-
-interface SVGFEDisplacementMapElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    readonly in2: SVGAnimatedString;
-    readonly scale: SVGAnimatedNumber;
-    readonly xChannelSelector: SVGAnimatedEnumeration;
-    readonly yChannelSelector: SVGAnimatedEnumeration;
-    readonly SVG_CHANNEL_A: number;
-    readonly SVG_CHANNEL_B: number;
-    readonly SVG_CHANNEL_G: number;
-    readonly SVG_CHANNEL_R: number;
-    readonly SVG_CHANNEL_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEDisplacementMapElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEDisplacementMapElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEDisplacementMapElement: {
-    prototype: SVGFEDisplacementMapElement;
-    new(): SVGFEDisplacementMapElement;
-    readonly SVG_CHANNEL_A: number;
-    readonly SVG_CHANNEL_B: number;
-    readonly SVG_CHANNEL_G: number;
-    readonly SVG_CHANNEL_R: number;
-    readonly SVG_CHANNEL_UNKNOWN: number;
-};
-
-interface SVGFEDistantLightElement extends SVGElement {
-    readonly azimuth: SVGAnimatedNumber;
-    readonly elevation: SVGAnimatedNumber;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEDistantLightElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEDistantLightElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEDistantLightElement: {
-    prototype: SVGFEDistantLightElement;
-    new(): SVGFEDistantLightElement;
-};
-
-interface SVGFEFloodElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFloodElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFloodElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEFloodElement: {
-    prototype: SVGFEFloodElement;
-    new(): SVGFEFloodElement;
-};
-
-interface SVGFEFuncAElement extends SVGComponentTransferFunctionElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFuncAElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFuncAElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEFuncAElement: {
-    prototype: SVGFEFuncAElement;
-    new(): SVGFEFuncAElement;
-};
-
-interface SVGFEFuncBElement extends SVGComponentTransferFunctionElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFuncBElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFuncBElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEFuncBElement: {
-    prototype: SVGFEFuncBElement;
-    new(): SVGFEFuncBElement;
-};
-
-interface SVGFEFuncGElement extends SVGComponentTransferFunctionElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFuncGElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFuncGElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEFuncGElement: {
-    prototype: SVGFEFuncGElement;
-    new(): SVGFEFuncGElement;
-};
-
-interface SVGFEFuncRElement extends SVGComponentTransferFunctionElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFuncRElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFuncRElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEFuncRElement: {
-    prototype: SVGFEFuncRElement;
-    new(): SVGFEFuncRElement;
-};
-
-interface SVGFEGaussianBlurElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    readonly stdDeviationX: SVGAnimatedNumber;
-    readonly stdDeviationY: SVGAnimatedNumber;
-    setStdDeviation(stdDeviationX: number, stdDeviationY: number): void;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEGaussianBlurElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEGaussianBlurElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEGaussianBlurElement: {
-    prototype: SVGFEGaussianBlurElement;
-    new(): SVGFEGaussianBlurElement;
-};
-
-interface SVGFEImageElement extends SVGElement, SVGFilterPrimitiveStandardAttributes, SVGURIReference {
-    readonly preserveAspectRatio: SVGAnimatedPreserveAspectRatio;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEImageElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEImageElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEImageElement: {
-    prototype: SVGFEImageElement;
-    new(): SVGFEImageElement;
-};
-
-interface SVGFEMergeElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEMergeElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEMergeElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEMergeElement: {
-    prototype: SVGFEMergeElement;
-    new(): SVGFEMergeElement;
-};
-
-interface SVGFEMergeNodeElement extends SVGElement {
-    readonly in1: SVGAnimatedString;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEMergeNodeElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEMergeNodeElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEMergeNodeElement: {
-    prototype: SVGFEMergeNodeElement;
-    new(): SVGFEMergeNodeElement;
-};
-
-interface SVGFEMorphologyElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    readonly operator: SVGAnimatedEnumeration;
-    readonly radiusX: SVGAnimatedNumber;
-    readonly radiusY: SVGAnimatedNumber;
-    readonly SVG_MORPHOLOGY_OPERATOR_DILATE: number;
-    readonly SVG_MORPHOLOGY_OPERATOR_ERODE: number;
-    readonly SVG_MORPHOLOGY_OPERATOR_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEMorphologyElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEMorphologyElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEMorphologyElement: {
-    prototype: SVGFEMorphologyElement;
-    new(): SVGFEMorphologyElement;
-    readonly SVG_MORPHOLOGY_OPERATOR_DILATE: number;
-    readonly SVG_MORPHOLOGY_OPERATOR_ERODE: number;
-    readonly SVG_MORPHOLOGY_OPERATOR_UNKNOWN: number;
-};
-
-interface SVGFEOffsetElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly dx: SVGAnimatedNumber;
-    readonly dy: SVGAnimatedNumber;
-    readonly in1: SVGAnimatedString;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEOffsetElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEOffsetElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEOffsetElement: {
-    prototype: SVGFEOffsetElement;
-    new(): SVGFEOffsetElement;
-};
-
-interface SVGFEPointLightElement extends SVGElement {
-    readonly x: SVGAnimatedNumber;
-    readonly y: SVGAnimatedNumber;
-    readonly z: SVGAnimatedNumber;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEPointLightElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEPointLightElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEPointLightElement: {
-    prototype: SVGFEPointLightElement;
-    new(): SVGFEPointLightElement;
-};
-
-interface SVGFESpecularLightingElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    readonly kernelUnitLengthX: SVGAnimatedNumber;
-    readonly kernelUnitLengthY: SVGAnimatedNumber;
-    readonly specularConstant: SVGAnimatedNumber;
-    readonly specularExponent: SVGAnimatedNumber;
-    readonly surfaceScale: SVGAnimatedNumber;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFESpecularLightingElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFESpecularLightingElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFESpecularLightingElement: {
-    prototype: SVGFESpecularLightingElement;
-    new(): SVGFESpecularLightingElement;
-};
-
-interface SVGFESpotLightElement extends SVGElement {
-    readonly limitingConeAngle: SVGAnimatedNumber;
-    readonly pointsAtX: SVGAnimatedNumber;
-    readonly pointsAtY: SVGAnimatedNumber;
-    readonly pointsAtZ: SVGAnimatedNumber;
-    readonly specularExponent: SVGAnimatedNumber;
-    readonly x: SVGAnimatedNumber;
-    readonly y: SVGAnimatedNumber;
-    readonly z: SVGAnimatedNumber;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFESpotLightElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFESpotLightElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFESpotLightElement: {
-    prototype: SVGFESpotLightElement;
-    new(): SVGFESpotLightElement;
-};
-
-interface SVGFETileElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFETileElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFETileElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFETileElement: {
-    prototype: SVGFETileElement;
-    new(): SVGFETileElement;
-};
-
-interface SVGFETurbulenceElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly baseFrequencyX: SVGAnimatedNumber;
-    readonly baseFrequencyY: SVGAnimatedNumber;
-    readonly numOctaves: SVGAnimatedInteger;
-    readonly seed: SVGAnimatedNumber;
-    readonly stitchTiles: SVGAnimatedEnumeration;
-    readonly type: SVGAnimatedEnumeration;
-    readonly SVG_STITCHTYPE_NOSTITCH: number;
-    readonly SVG_STITCHTYPE_STITCH: number;
-    readonly SVG_STITCHTYPE_UNKNOWN: number;
-    readonly SVG_TURBULENCE_TYPE_FRACTALNOISE: number;
-    readonly SVG_TURBULENCE_TYPE_TURBULENCE: number;
-    readonly SVG_TURBULENCE_TYPE_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFETurbulenceElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFETurbulenceElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFETurbulenceElement: {
-    prototype: SVGFETurbulenceElement;
-    new(): SVGFETurbulenceElement;
-    readonly SVG_STITCHTYPE_NOSTITCH: number;
-    readonly SVG_STITCHTYPE_STITCH: number;
-    readonly SVG_STITCHTYPE_UNKNOWN: number;
-    readonly SVG_TURBULENCE_TYPE_FRACTALNOISE: number;
-    readonly SVG_TURBULENCE_TYPE_TURBULENCE: number;
-    readonly SVG_TURBULENCE_TYPE_UNKNOWN: number;
-};
-
-interface SVGFilterElement extends SVGElement, SVGUnitTypes, SVGURIReference {
-    /** @deprecated */
-    readonly filterResX: SVGAnimatedInteger;
-    /** @deprecated */
-    readonly filterResY: SVGAnimatedInteger;
-    readonly filterUnits: SVGAnimatedEnumeration;
-    readonly height: SVGAnimatedLength;
-    readonly primitiveUnits: SVGAnimatedEnumeration;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-    /** @deprecated */
-    setFilterRes(filterResX: number, filterResY: number): void;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFilterElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFilterElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFilterElement: {
-    prototype: SVGFilterElement;
-    new(): SVGFilterElement;
-};
-
-interface SVGFilterPrimitiveStandardAttributes {
-    readonly height: SVGAnimatedLength;
-    readonly result: SVGAnimatedString;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-}
-
-interface SVGFitToViewBox {
-    readonly preserveAspectRatio: SVGAnimatedPreserveAspectRatio;
-    readonly viewBox: SVGAnimatedRect;
-}
-
-interface SVGForeignObjectElement extends SVGGraphicsElement {
-    readonly height: SVGAnimatedLength;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGForeignObjectElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGForeignObjectElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGForeignObjectElement: {
-    prototype: SVGForeignObjectElement;
-    new(): SVGForeignObjectElement;
-};
-
-interface SVGGElement extends SVGGraphicsElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGGElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGGElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGGElement: {
-    prototype: SVGGElement;
-    new(): SVGGElement;
-};
-
-interface SVGGradientElement extends SVGElement, SVGUnitTypes, SVGURIReference {
-    readonly gradientTransform: SVGAnimatedTransformList;
-    readonly gradientUnits: SVGAnimatedEnumeration;
-    readonly spreadMethod: SVGAnimatedEnumeration;
-    readonly SVG_SPREADMETHOD_PAD: number;
-    readonly SVG_SPREADMETHOD_REFLECT: number;
-    readonly SVG_SPREADMETHOD_REPEAT: number;
-    readonly SVG_SPREADMETHOD_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGGradientElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGGradientElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGGradientElement: {
-    prototype: SVGGradientElement;
-    new(): SVGGradientElement;
-    readonly SVG_SPREADMETHOD_PAD: number;
-    readonly SVG_SPREADMETHOD_REFLECT: number;
-    readonly SVG_SPREADMETHOD_REPEAT: number;
-    readonly SVG_SPREADMETHOD_UNKNOWN: number;
-};
-
-interface SVGGraphicsElement extends SVGElement, SVGTests {
-    /** @deprecated */
-    readonly farthestViewportElement: SVGElement | null;
-    /** @deprecated */
-    readonly nearestViewportElement: SVGElement | null;
-    readonly transform: SVGAnimatedTransformList;
-    getBBox(): SVGRect;
-    getCTM(): SVGMatrix | null;
-    getScreenCTM(): SVGMatrix | null;
-    /** @deprecated */
-    getTransformToElement(element: SVGElement): SVGMatrix;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGGraphicsElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGGraphicsElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGGraphicsElement: {
-    prototype: SVGGraphicsElement;
-    new(): SVGGraphicsElement;
-};
-
-interface SVGImageElement extends SVGGraphicsElement, SVGURIReference {
-    readonly height: SVGAnimatedLength;
-    readonly preserveAspectRatio: SVGAnimatedPreserveAspectRatio;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGImageElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGImageElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGImageElement: {
-    prototype: SVGImageElement;
-    new(): SVGImageElement;
-};
-
-interface SVGLength {
-    readonly unitType: number;
-    value: number;
-    valueAsString: string;
-    valueInSpecifiedUnits: number;
-    convertToSpecifiedUnits(unitType: number): void;
-    newValueSpecifiedUnits(unitType: number, valueInSpecifiedUnits: number): void;
-    readonly SVG_LENGTHTYPE_CM: number;
-    readonly SVG_LENGTHTYPE_EMS: number;
-    readonly SVG_LENGTHTYPE_EXS: number;
-    readonly SVG_LENGTHTYPE_IN: number;
-    readonly SVG_LENGTHTYPE_MM: number;
-    readonly SVG_LENGTHTYPE_NUMBER: number;
-    readonly SVG_LENGTHTYPE_PC: number;
-    readonly SVG_LENGTHTYPE_PERCENTAGE: number;
-    readonly SVG_LENGTHTYPE_PT: number;
-    readonly SVG_LENGTHTYPE_PX: number;
-    readonly SVG_LENGTHTYPE_UNKNOWN: number;
-}
-
-declare var SVGLength: {
-    prototype: SVGLength;
-    new(): SVGLength;
-    readonly SVG_LENGTHTYPE_CM: number;
-    readonly SVG_LENGTHTYPE_EMS: number;
-    readonly SVG_LENGTHTYPE_EXS: number;
-    readonly SVG_LENGTHTYPE_IN: number;
-    readonly SVG_LENGTHTYPE_MM: number;
-    readonly SVG_LENGTHTYPE_NUMBER: number;
-    readonly SVG_LENGTHTYPE_PC: number;
-    readonly SVG_LENGTHTYPE_PERCENTAGE: number;
-    readonly SVG_LENGTHTYPE_PT: number;
-    readonly SVG_LENGTHTYPE_PX: number;
-    readonly SVG_LENGTHTYPE_UNKNOWN: number;
-};
-
-interface SVGLengthList {
-    readonly numberOfItems: number;
-    appendItem(newItem: SVGLength): SVGLength;
-    clear(): void;
-    getItem(index: number): SVGLength;
-    initialize(newItem: SVGLength): SVGLength;
-    insertItemBefore(newItem: SVGLength, index: number): SVGLength;
-    removeItem(index: number): SVGLength;
-    replaceItem(newItem: SVGLength, index: number): SVGLength;
-}
-
-declare var SVGLengthList: {
-    prototype: SVGLengthList;
-    new(): SVGLengthList;
-};
-
-interface SVGLineElement extends SVGGraphicsElement {
-    readonly x1: SVGAnimatedLength;
-    readonly x2: SVGAnimatedLength;
-    readonly y1: SVGAnimatedLength;
-    readonly y2: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGLineElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGLineElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGLineElement: {
-    prototype: SVGLineElement;
-    new(): SVGLineElement;
-};
-
-interface SVGLinearGradientElement extends SVGGradientElement {
-    readonly x1: SVGAnimatedLength;
-    readonly x2: SVGAnimatedLength;
-    readonly y1: SVGAnimatedLength;
-    readonly y2: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGLinearGradientElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGLinearGradientElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGLinearGradientElement: {
-    prototype: SVGLinearGradientElement;
-    new(): SVGLinearGradientElement;
-};
-
-interface SVGMarkerElement extends SVGElement, SVGFitToViewBox {
-    readonly markerHeight: SVGAnimatedLength;
-    readonly markerUnits: SVGAnimatedEnumeration;
-    readonly markerWidth: SVGAnimatedLength;
-    readonly orientAngle: SVGAnimatedAngle;
-    readonly orientType: SVGAnimatedEnumeration;
-    readonly refX: SVGAnimatedLength;
-    readonly refY: SVGAnimatedLength;
-    setOrientToAngle(angle: SVGAngle): void;
-    setOrientToAuto(): void;
-    readonly SVG_MARKERUNITS_STROKEWIDTH: number;
-    readonly SVG_MARKERUNITS_UNKNOWN: number;
-    readonly SVG_MARKERUNITS_USERSPACEONUSE: number;
-    readonly SVG_MARKER_ORIENT_ANGLE: number;
-    readonly SVG_MARKER_ORIENT_AUTO: number;
-    readonly SVG_MARKER_ORIENT_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGMarkerElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGMarkerElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGMarkerElement: {
-    prototype: SVGMarkerElement;
-    new(): SVGMarkerElement;
-    readonly SVG_MARKERUNITS_STROKEWIDTH: number;
-    readonly SVG_MARKERUNITS_UNKNOWN: number;
-    readonly SVG_MARKERUNITS_USERSPACEONUSE: number;
-    readonly SVG_MARKER_ORIENT_ANGLE: number;
-    readonly SVG_MARKER_ORIENT_AUTO: number;
-    readonly SVG_MARKER_ORIENT_UNKNOWN: number;
-};
-
-interface SVGMaskElement extends SVGElement, SVGTests, SVGUnitTypes {
-    readonly height: SVGAnimatedLength;
-    readonly maskContentUnits: SVGAnimatedEnumeration;
-    readonly maskUnits: SVGAnimatedEnumeration;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGMaskElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGMaskElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGMaskElement: {
-    prototype: SVGMaskElement;
-    new(): SVGMaskElement;
-};
-
-interface SVGMatrix {
-    a: number;
-    b: number;
-    c: number;
-    d: number;
-    e: number;
-    f: number;
-    flipX(): SVGMatrix;
-    flipY(): SVGMatrix;
-    inverse(): SVGMatrix;
-    multiply(secondMatrix: SVGMatrix): SVGMatrix;
-    rotate(angle: number): SVGMatrix;
-    rotateFromVector(x: number, y: number): SVGMatrix;
-    scale(scaleFactor: number): SVGMatrix;
-    scaleNonUniform(scaleFactorX: number, scaleFactorY: number): SVGMatrix;
-    skewX(angle: number): SVGMatrix;
-    skewY(angle: number): SVGMatrix;
-    translate(x: number, y: number): SVGMatrix;
-}
-
-declare var SVGMatrix: {
-    prototype: SVGMatrix;
-    new(): SVGMatrix;
-};
-
-interface SVGMetadataElement extends SVGElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGMetadataElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGMetadataElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGMetadataElement: {
-    prototype: SVGMetadataElement;
-    new(): SVGMetadataElement;
-};
-
-interface SVGNumber {
-    value: number;
-}
-
-declare var SVGNumber: {
-    prototype: SVGNumber;
-    new(): SVGNumber;
-};
-
-interface SVGNumberList {
-    readonly numberOfItems: number;
-    appendItem(newItem: SVGNumber): SVGNumber;
-    clear(): void;
-    getItem(index: number): SVGNumber;
-    initialize(newItem: SVGNumber): SVGNumber;
-    insertItemBefore(newItem: SVGNumber, index: number): SVGNumber;
-    removeItem(index: number): SVGNumber;
-    replaceItem(newItem: SVGNumber, index: number): SVGNumber;
-}
-
-declare var SVGNumberList: {
-    prototype: SVGNumberList;
-    new(): SVGNumberList;
-};
-
-interface SVGPathElement extends SVGGraphicsElement {
-    /** @deprecated */
-    readonly pathSegList: SVGPathSegList;
-    /** @deprecated */
-    createSVGPathSegArcAbs(x: number, y: number, r1: number, r2: number, angle: number, largeArcFlag: boolean, sweepFlag: boolean): SVGPathSegArcAbs;
-    /** @deprecated */
-    createSVGPathSegArcRel(x: number, y: number, r1: number, r2: number, angle: number, largeArcFlag: boolean, sweepFlag: boolean): SVGPathSegArcRel;
-    /** @deprecated */
-    createSVGPathSegClosePath(): SVGPathSegClosePath;
-    /** @deprecated */
-    createSVGPathSegCurvetoCubicAbs(x: number, y: number, x1: number, y1: number, x2: number, y2: number): SVGPathSegCurvetoCubicAbs;
-    /** @deprecated */
-    createSVGPathSegCurvetoCubicRel(x: number, y: number, x1: number, y1: number, x2: number, y2: number): SVGPathSegCurvetoCubicRel;
-    /** @deprecated */
-    createSVGPathSegCurvetoCubicSmoothAbs(x: number, y: number, x2: number, y2: number): SVGPathSegCurvetoCubicSmoothAbs;
-    /** @deprecated */
-    createSVGPathSegCurvetoCubicSmoothRel(x: number, y: number, x2: number, y2: number): SVGPathSegCurvetoCubicSmoothRel;
-    /** @deprecated */
-    createSVGPathSegCurvetoQuadraticAbs(x: number, y: number, x1: number, y1: number): SVGPathSegCurvetoQuadraticAbs;
-    /** @deprecated */
-    createSVGPathSegCurvetoQuadraticRel(x: number, y: number, x1: number, y1: number): SVGPathSegCurvetoQuadraticRel;
-    /** @deprecated */
-    createSVGPathSegCurvetoQuadraticSmoothAbs(x: number, y: number): SVGPathSegCurvetoQuadraticSmoothAbs;
-    /** @deprecated */
-    createSVGPathSegCurvetoQuadraticSmoothRel(x: number, y: number): SVGPathSegCurvetoQuadraticSmoothRel;
-    /** @deprecated */
-    createSVGPathSegLinetoAbs(x: number, y: number): SVGPathSegLinetoAbs;
-    /** @deprecated */
-    createSVGPathSegLinetoHorizontalAbs(x: number): SVGPathSegLinetoHorizontalAbs;
-    /** @deprecated */
-    createSVGPathSegLinetoHorizontalRel(x: number): SVGPathSegLinetoHorizontalRel;
-    /** @deprecated */
-    createSVGPathSegLinetoRel(x: number, y: number): SVGPathSegLinetoRel;
-    /** @deprecated */
-    createSVGPathSegLinetoVerticalAbs(y: number): SVGPathSegLinetoVerticalAbs;
-    /** @deprecated */
-    createSVGPathSegLinetoVerticalRel(y: number): SVGPathSegLinetoVerticalRel;
-    /** @deprecated */
-    createSVGPathSegMovetoAbs(x: number, y: number): SVGPathSegMovetoAbs;
-    /** @deprecated */
-    createSVGPathSegMovetoRel(x: number, y: number): SVGPathSegMovetoRel;
-    /** @deprecated */
-    getPathSegAtLength(distance: number): number;
-    getPointAtLength(distance: number): SVGPoint;
-    getTotalLength(): number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGPathElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGPathElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGPathElement: {
-    prototype: SVGPathElement;
-    new(): SVGPathElement;
-};
-
-interface SVGPathSeg {
-    readonly pathSegType: number;
-    readonly pathSegTypeAsLetter: string;
-    readonly PATHSEG_ARC_ABS: number;
-    readonly PATHSEG_ARC_REL: number;
-    readonly PATHSEG_CLOSEPATH: number;
-    readonly PATHSEG_CURVETO_CUBIC_ABS: number;
-    readonly PATHSEG_CURVETO_CUBIC_REL: number;
-    readonly PATHSEG_CURVETO_CUBIC_SMOOTH_ABS: number;
-    readonly PATHSEG_CURVETO_CUBIC_SMOOTH_REL: number;
-    readonly PATHSEG_CURVETO_QUADRATIC_ABS: number;
-    readonly PATHSEG_CURVETO_QUADRATIC_REL: number;
-    readonly PATHSEG_CURVETO_QUADRATIC_SMOOTH_ABS: number;
-    readonly PATHSEG_CURVETO_QUADRATIC_SMOOTH_REL: number;
-    readonly PATHSEG_LINETO_ABS: number;
-    readonly PATHSEG_LINETO_HORIZONTAL_ABS: number;
-    readonly PATHSEG_LINETO_HORIZONTAL_REL: number;
-    readonly PATHSEG_LINETO_REL: number;
-    readonly PATHSEG_LINETO_VERTICAL_ABS: number;
-    readonly PATHSEG_LINETO_VERTICAL_REL: number;
-    readonly PATHSEG_MOVETO_ABS: number;
-    readonly PATHSEG_MOVETO_REL: number;
-    readonly PATHSEG_UNKNOWN: number;
-}
-
-declare var SVGPathSeg: {
-    prototype: SVGPathSeg;
-    new(): SVGPathSeg;
-    readonly PATHSEG_ARC_ABS: number;
-    readonly PATHSEG_ARC_REL: number;
-    readonly PATHSEG_CLOSEPATH: number;
-    readonly PATHSEG_CURVETO_CUBIC_ABS: number;
-    readonly PATHSEG_CURVETO_CUBIC_REL: number;
-    readonly PATHSEG_CURVETO_CUBIC_SMOOTH_ABS: number;
-    readonly PATHSEG_CURVETO_CUBIC_SMOOTH_REL: number;
-    readonly PATHSEG_CURVETO_QUADRATIC_ABS: number;
-    readonly PATHSEG_CURVETO_QUADRATIC_REL: number;
-    readonly PATHSEG_CURVETO_QUADRATIC_SMOOTH_ABS: number;
-    readonly PATHSEG_CURVETO_QUADRATIC_SMOOTH_REL: number;
-    readonly PATHSEG_LINETO_ABS: number;
-    readonly PATHSEG_LINETO_HORIZONTAL_ABS: number;
-    readonly PATHSEG_LINETO_HORIZONTAL_REL: number;
-    readonly PATHSEG_LINETO_REL: number;
-    readonly PATHSEG_LINETO_VERTICAL_ABS: number;
-    readonly PATHSEG_LINETO_VERTICAL_REL: number;
-    readonly PATHSEG_MOVETO_ABS: number;
-    readonly PATHSEG_MOVETO_REL: number;
-    readonly PATHSEG_UNKNOWN: number;
-};
-
-interface SVGPathSegArcAbs extends SVGPathSeg {
-    angle: number;
-    largeArcFlag: boolean;
-    r1: number;
-    r2: number;
-    sweepFlag: boolean;
-    x: number;
-    y: number;
-}
-
-declare var SVGPathSegArcAbs: {
-    prototype: SVGPathSegArcAbs;
-    new(): SVGPathSegArcAbs;
-};
-
-interface SVGPathSegArcRel extends SVGPathSeg {
-    angle: number;
-    largeArcFlag: boolean;
-    r1: number;
-    r2: number;
-    sweepFlag: boolean;
-    x: number;
-    y: number;
-}
-
-declare var SVGPathSegArcRel: {
-    prototype: SVGPathSegArcRel;
-    new(): SVGPathSegArcRel;
-};
-
-interface SVGPathSegClosePath extends SVGPathSeg {
-}
-
-declare var SVGPathSegClosePath: {
-    prototype: SVGPathSegClosePath;
-    new(): SVGPathSegClosePath;
-};
-
-interface SVGPathSegCurvetoCubicAbs extends SVGPathSeg {
-    x: number;
-    x1: number;
-    x2: number;
-    y: number;
-    y1: number;
-    y2: number;
-}
-
-declare var SVGPathSegCurvetoCubicAbs: {
-    prototype: SVGPathSegCurvetoCubicAbs;
-    new(): SVGPathSegCurvetoCubicAbs;
-};
-
-interface SVGPathSegCurvetoCubicRel extends SVGPathSeg {
-    x: number;
-    x1: number;
-    x2: number;
-    y: number;
-    y1: number;
-    y2: number;
-}
-
-declare var SVGPathSegCurvetoCubicRel: {
-    prototype: SVGPathSegCurvetoCubicRel;
-    new(): SVGPathSegCurvetoCubicRel;
-};
-
-interface SVGPathSegCurvetoCubicSmoothAbs extends SVGPathSeg {
-    x: number;
-    x2: number;
-    y: number;
-    y2: number;
-}
-
-declare var SVGPathSegCurvetoCubicSmoothAbs: {
-    prototype: SVGPathSegCurvetoCubicSmoothAbs;
-    new(): SVGPathSegCurvetoCubicSmoothAbs;
-};
-
-interface SVGPathSegCurvetoCubicSmoothRel extends SVGPathSeg {
-    x: number;
-    x2: number;
-    y: number;
-    y2: number;
-}
-
-declare var SVGPathSegCurvetoCubicSmoothRel: {
-    prototype: SVGPathSegCurvetoCubicSmoothRel;
-    new(): SVGPathSegCurvetoCubicSmoothRel;
-};
-
-interface SVGPathSegCurvetoQuadraticAbs extends SVGPathSeg {
-    x: number;
-    x1: number;
-    y: number;
-    y1: number;
-}
-
-declare var SVGPathSegCurvetoQuadraticAbs: {
-    prototype: SVGPathSegCurvetoQuadraticAbs;
-    new(): SVGPathSegCurvetoQuadraticAbs;
-};
-
-interface SVGPathSegCurvetoQuadraticRel extends SVGPathSeg {
-    x: number;
-    x1: number;
-    y: number;
-    y1: number;
-}
-
-declare var SVGPathSegCurvetoQuadraticRel: {
-    prototype: SVGPathSegCurvetoQuadraticRel;
-    new(): SVGPathSegCurvetoQuadraticRel;
-};
-
-interface SVGPathSegCurvetoQuadraticSmoothAbs extends SVGPathSeg {
-    x: number;
-    y: number;
-}
-
-declare var SVGPathSegCurvetoQuadraticSmoothAbs: {
-    prototype: SVGPathSegCurvetoQuadraticSmoothAbs;
-    new(): SVGPathSegCurvetoQuadraticSmoothAbs;
-};
-
-interface SVGPathSegCurvetoQuadraticSmoothRel extends SVGPathSeg {
-    x: number;
-    y: number;
-}
-
-declare var SVGPathSegCurvetoQuadraticSmoothRel: {
-    prototype: SVGPathSegCurvetoQuadraticSmoothRel;
-    new(): SVGPathSegCurvetoQuadraticSmoothRel;
-};
-
-interface SVGPathSegLinetoAbs extends SVGPathSeg {
-    x: number;
-    y: number;
-}
-
-declare var SVGPathSegLinetoAbs: {
-    prototype: SVGPathSegLinetoAbs;
-    new(): SVGPathSegLinetoAbs;
-};
-
-interface SVGPathSegLinetoHorizontalAbs extends SVGPathSeg {
-    x: number;
-}
-
-declare var SVGPathSegLinetoHorizontalAbs: {
-    prototype: SVGPathSegLinetoHorizontalAbs;
-    new(): SVGPathSegLinetoHorizontalAbs;
-};
-
-interface SVGPathSegLinetoHorizontalRel extends SVGPathSeg {
-    x: number;
-}
-
-declare var SVGPathSegLinetoHorizontalRel: {
-    prototype: SVGPathSegLinetoHorizontalRel;
-    new(): SVGPathSegLinetoHorizontalRel;
-};
-
-interface SVGPathSegLinetoRel extends SVGPathSeg {
-    x: number;
-    y: number;
-}
-
-declare var SVGPathSegLinetoRel: {
-    prototype: SVGPathSegLinetoRel;
-    new(): SVGPathSegLinetoRel;
-};
-
-interface SVGPathSegLinetoVerticalAbs extends SVGPathSeg {
-    y: number;
-}
-
-declare var SVGPathSegLinetoVerticalAbs: {
-    prototype: SVGPathSegLinetoVerticalAbs;
-    new(): SVGPathSegLinetoVerticalAbs;
-};
-
-interface SVGPathSegLinetoVerticalRel extends SVGPathSeg {
-    y: number;
-}
-
-declare var SVGPathSegLinetoVerticalRel: {
-    prototype: SVGPathSegLinetoVerticalRel;
-    new(): SVGPathSegLinetoVerticalRel;
-};
-
-interface SVGPathSegList {
-    readonly numberOfItems: number;
-    appendItem(newItem: SVGPathSeg): SVGPathSeg;
-    clear(): void;
-    getItem(index: number): SVGPathSeg;
-    initialize(newItem: SVGPathSeg): SVGPathSeg;
-    insertItemBefore(newItem: SVGPathSeg, index: number): SVGPathSeg;
-    removeItem(index: number): SVGPathSeg;
-    replaceItem(newItem: SVGPathSeg, index: number): SVGPathSeg;
-}
-
-declare var SVGPathSegList: {
-    prototype: SVGPathSegList;
-    new(): SVGPathSegList;
-};
-
-interface SVGPathSegMovetoAbs extends SVGPathSeg {
-    x: number;
-    y: number;
-}
-
-declare var SVGPathSegMovetoAbs: {
-    prototype: SVGPathSegMovetoAbs;
-    new(): SVGPathSegMovetoAbs;
-};
-
-interface SVGPathSegMovetoRel extends SVGPathSeg {
-    x: number;
-    y: number;
-}
-
-declare var SVGPathSegMovetoRel: {
-    prototype: SVGPathSegMovetoRel;
-    new(): SVGPathSegMovetoRel;
-};
-
-interface SVGPatternElement extends SVGElement, SVGTests, SVGUnitTypes, SVGFitToViewBox, SVGURIReference {
-    readonly height: SVGAnimatedLength;
-    readonly patternContentUnits: SVGAnimatedEnumeration;
-    readonly patternTransform: SVGAnimatedTransformList;
-    readonly patternUnits: SVGAnimatedEnumeration;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGPatternElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGPatternElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGPatternElement: {
-    prototype: SVGPatternElement;
-    new(): SVGPatternElement;
-};
-
-interface SVGPoint {
-    x: number;
-    y: number;
-    matrixTransform(matrix: SVGMatrix): SVGPoint;
-}
-
-declare var SVGPoint: {
-    prototype: SVGPoint;
-    new(): SVGPoint;
-};
-
-interface SVGPointList {
-    readonly numberOfItems: number;
-    appendItem(newItem: SVGPoint): SVGPoint;
-    clear(): void;
-    getItem(index: number): SVGPoint;
-    initialize(newItem: SVGPoint): SVGPoint;
-    insertItemBefore(newItem: SVGPoint, index: number): SVGPoint;
-    removeItem(index: number): SVGPoint;
-    replaceItem(newItem: SVGPoint, index: number): SVGPoint;
-}
-
-declare var SVGPointList: {
-    prototype: SVGPointList;
-    new(): SVGPointList;
-};
-
-interface SVGPolygonElement extends SVGGraphicsElement, SVGAnimatedPoints {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGPolygonElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGPolygonElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGPolygonElement: {
-    prototype: SVGPolygonElement;
-    new(): SVGPolygonElement;
-};
-
-interface SVGPolylineElement extends SVGGraphicsElement, SVGAnimatedPoints {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGPolylineElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGPolylineElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGPolylineElement: {
-    prototype: SVGPolylineElement;
-    new(): SVGPolylineElement;
-};
-
-interface SVGPreserveAspectRatio {
-    align: number;
-    meetOrSlice: number;
-    readonly SVG_MEETORSLICE_MEET: number;
-    readonly SVG_MEETORSLICE_SLICE: number;
-    readonly SVG_MEETORSLICE_UNKNOWN: number;
-    readonly SVG_PRESERVEASPECTRATIO_NONE: number;
-    readonly SVG_PRESERVEASPECTRATIO_UNKNOWN: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMAXYMAX: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMAXYMID: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMAXYMIN: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMIDYMAX: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMIDYMID: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMIDYMIN: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMINYMAX: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMINYMID: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMINYMIN: number;
-}
-
-declare var SVGPreserveAspectRatio: {
-    prototype: SVGPreserveAspectRatio;
-    new(): SVGPreserveAspectRatio;
-    readonly SVG_MEETORSLICE_MEET: number;
-    readonly SVG_MEETORSLICE_SLICE: number;
-    readonly SVG_MEETORSLICE_UNKNOWN: number;
-    readonly SVG_PRESERVEASPECTRATIO_NONE: number;
-    readonly SVG_PRESERVEASPECTRATIO_UNKNOWN: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMAXYMAX: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMAXYMID: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMAXYMIN: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMIDYMAX: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMIDYMID: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMIDYMIN: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMINYMAX: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMINYMID: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMINYMIN: number;
-};
-
-interface SVGRadialGradientElement extends SVGGradientElement {
-    readonly cx: SVGAnimatedLength;
-    readonly cy: SVGAnimatedLength;
-    readonly fx: SVGAnimatedLength;
-    readonly fy: SVGAnimatedLength;
-    readonly r: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGRadialGradientElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGRadialGradientElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGRadialGradientElement: {
-    prototype: SVGRadialGradientElement;
-    new(): SVGRadialGradientElement;
-};
-
-interface SVGRect {
-    height: number;
-    width: number;
-    x: number;
-    y: number;
-}
-
-declare var SVGRect: {
-    prototype: SVGRect;
-    new(): SVGRect;
-};
-
-interface SVGRectElement extends SVGGraphicsElement {
-    readonly height: SVGAnimatedLength;
-    readonly rx: SVGAnimatedLength;
-    readonly ry: SVGAnimatedLength;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGRectElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGRectElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGRectElement: {
-    prototype: SVGRectElement;
-    new(): SVGRectElement;
-};
-
-interface SVGSVGElementEventMap extends SVGElementEventMap {
-    "SVGAbort": Event;
-    "SVGError": Event;
-    "resize": UIEvent;
-    "scroll": UIEvent;
-    "SVGUnload": Event;
-    "SVGZoom": SVGZoomEvent;
-}
-
-interface SVGSVGElement extends SVGGraphicsElement, DocumentEvent, SVGFitToViewBox, SVGZoomAndPan {
-    /** @deprecated */
-    contentScriptType: string;
-    /** @deprecated */
-    contentStyleType: string;
-    currentScale: number;
-    readonly currentTranslate: SVGPoint;
-    readonly height: SVGAnimatedLength;
-    onabort: ((this: SVGSVGElement, ev: Event) => any) | null;
-    onerror: ((this: SVGSVGElement, ev: Event) => any) | null;
-    onresize: ((this: SVGSVGElement, ev: UIEvent) => any) | null;
-    onscroll: ((this: SVGSVGElement, ev: UIEvent) => any) | null;
-    onunload: ((this: SVGSVGElement, ev: Event) => any) | null;
-    onzoom: ((this: SVGSVGElement, ev: SVGZoomEvent) => any) | null;
-    /** @deprecated */
-    readonly pixelUnitToMillimeterX: number;
-    /** @deprecated */
-    readonly pixelUnitToMillimeterY: number;
-    /** @deprecated */
-    readonly screenPixelToMillimeterX: number;
-    /** @deprecated */
-    readonly screenPixelToMillimeterY: number;
-    /** @deprecated */
-    readonly viewport: SVGRect;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-    checkEnclosure(element: SVGElement, rect: SVGRect): boolean;
-    checkIntersection(element: SVGElement, rect: SVGRect): boolean;
-    createSVGAngle(): SVGAngle;
-    createSVGLength(): SVGLength;
-    createSVGMatrix(): SVGMatrix;
-    createSVGNumber(): SVGNumber;
-    createSVGPoint(): SVGPoint;
-    createSVGRect(): SVGRect;
-    createSVGTransform(): SVGTransform;
-    createSVGTransformFromMatrix(matrix: SVGMatrix): SVGTransform;
-    deselectAll(): void;
-    /** @deprecated */
-    forceRedraw(): void;
-    getComputedStyle(elt: Element, pseudoElt?: string | null): CSSStyleDeclaration;
-    /** @deprecated */
-    getCurrentTime(): number;
-    getElementById(elementId: string): Element;
-    getEnclosureList(rect: SVGRect, referenceElement: SVGElement): NodeListOf<SVGCircleElement | SVGEllipseElement | SVGImageElement | SVGLineElement | SVGPathElement | SVGPolygonElement | SVGPolylineElement | SVGRectElement | SVGTextElement | SVGUseElement>;
-    getIntersectionList(rect: SVGRect, referenceElement: SVGElement): NodeListOf<SVGCircleElement | SVGEllipseElement | SVGImageElement | SVGLineElement | SVGPathElement | SVGPolygonElement | SVGPolylineElement | SVGRectElement | SVGTextElement | SVGUseElement>;
-    /** @deprecated */
-    pauseAnimations(): void;
-    /** @deprecated */
-    setCurrentTime(seconds: number): void;
-    /** @deprecated */
-    suspendRedraw(maxWaitMilliseconds: number): number;
-    /** @deprecated */
-    unpauseAnimations(): void;
-    /** @deprecated */
-    unsuspendRedraw(suspendHandleID: number): void;
-    /** @deprecated */
-    unsuspendRedrawAll(): void;
-    addEventListener<K extends keyof SVGSVGElementEventMap>(type: K, listener: (this: SVGSVGElement, ev: SVGSVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGSVGElementEventMap>(type: K, listener: (this: SVGSVGElement, ev: SVGSVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGSVGElement: {
-    prototype: SVGSVGElement;
-    new(): SVGSVGElement;
-};
-
-interface SVGScriptElement extends SVGElement, SVGURIReference {
-    type: string;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGScriptElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGScriptElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGScriptElement: {
-    prototype: SVGScriptElement;
-    new(): SVGScriptElement;
-};
-
-interface SVGStopElement extends SVGElement {
-    readonly offset: SVGAnimatedNumber;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGStopElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGStopElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGStopElement: {
-    prototype: SVGStopElement;
-    new(): SVGStopElement;
-};
-
-interface SVGStringList {
-    readonly numberOfItems: number;
-    appendItem(newItem: string): string;
-    clear(): void;
-    getItem(index: number): string;
-    initialize(newItem: string): string;
-    insertItemBefore(newItem: string, index: number): string;
-    removeItem(index: number): string;
-    replaceItem(newItem: string, index: number): string;
-}
-
-declare var SVGStringList: {
-    prototype: SVGStringList;
-    new(): SVGStringList;
-};
-
-interface SVGStylable {
-    className: any;
-}
-
-declare var SVGStylable: {
-    prototype: SVGStylable;
-    new(): SVGStylable;
-};
-
-interface SVGStyleElement extends SVGElement {
-    disabled: boolean;
-    media: string;
-    title: string;
-    type: string;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGStyleElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGStyleElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGStyleElement: {
-    prototype: SVGStyleElement;
-    new(): SVGStyleElement;
-};
-
-interface SVGSwitchElement extends SVGGraphicsElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGSwitchElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGSwitchElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGSwitchElement: {
-    prototype: SVGSwitchElement;
-    new(): SVGSwitchElement;
-};
-
-interface SVGSymbolElement extends SVGElement, SVGFitToViewBox {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGSymbolElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGSymbolElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGSymbolElement: {
-    prototype: SVGSymbolElement;
-    new(): SVGSymbolElement;
-};
-
-interface SVGTSpanElement extends SVGTextPositioningElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTSpanElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTSpanElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGTSpanElement: {
-    prototype: SVGTSpanElement;
-    new(): SVGTSpanElement;
-};
-
-interface SVGTests {
-    readonly requiredExtensions: SVGStringList;
-    /** @deprecated */
-    readonly requiredFeatures: SVGStringList;
-    readonly systemLanguage: SVGStringList;
-    /** @deprecated */
-    hasExtension(extension: string): boolean;
-}
-
-interface SVGTextContentElement extends SVGGraphicsElement {
-    readonly lengthAdjust: SVGAnimatedEnumeration;
-    readonly textLength: SVGAnimatedLength;
-    getCharNumAtPosition(point: SVGPoint): number;
-    getComputedTextLength(): number;
-    getEndPositionOfChar(charnum: number): SVGPoint;
-    getExtentOfChar(charnum: number): SVGRect;
-    getNumberOfChars(): number;
-    getRotationOfChar(charnum: number): number;
-    getStartPositionOfChar(charnum: number): SVGPoint;
-    getSubStringLength(charnum: number, nchars: number): number;
-    selectSubString(charnum: number, nchars: number): void;
-    readonly LENGTHADJUST_SPACING: number;
-    readonly LENGTHADJUST_SPACINGANDGLYPHS: number;
-    readonly LENGTHADJUST_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTextContentElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTextContentElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGTextContentElement: {
-    prototype: SVGTextContentElement;
-    new(): SVGTextContentElement;
-    readonly LENGTHADJUST_SPACING: number;
-    readonly LENGTHADJUST_SPACINGANDGLYPHS: number;
-    readonly LENGTHADJUST_UNKNOWN: number;
-};
-
-interface SVGTextElement extends SVGTextPositioningElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTextElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTextElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGTextElement: {
-    prototype: SVGTextElement;
-    new(): SVGTextElement;
-};
-
-interface SVGTextPathElement extends SVGTextContentElement, SVGURIReference {
-    readonly method: SVGAnimatedEnumeration;
-    readonly spacing: SVGAnimatedEnumeration;
-    readonly startOffset: SVGAnimatedLength;
-    readonly TEXTPATH_METHODTYPE_ALIGN: number;
-    readonly TEXTPATH_METHODTYPE_STRETCH: number;
-    readonly TEXTPATH_METHODTYPE_UNKNOWN: number;
-    readonly TEXTPATH_SPACINGTYPE_AUTO: number;
-    readonly TEXTPATH_SPACINGTYPE_EXACT: number;
-    readonly TEXTPATH_SPACINGTYPE_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTextPathElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTextPathElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGTextPathElement: {
-    prototype: SVGTextPathElement;
-    new(): SVGTextPathElement;
-    readonly TEXTPATH_METHODTYPE_ALIGN: number;
-    readonly TEXTPATH_METHODTYPE_STRETCH: number;
-    readonly TEXTPATH_METHODTYPE_UNKNOWN: number;
-    readonly TEXTPATH_SPACINGTYPE_AUTO: number;
-    readonly TEXTPATH_SPACINGTYPE_EXACT: number;
-    readonly TEXTPATH_SPACINGTYPE_UNKNOWN: number;
-};
-
-interface SVGTextPositioningElement extends SVGTextContentElement {
-    readonly dx: SVGAnimatedLengthList;
-    readonly dy: SVGAnimatedLengthList;
-    readonly rotate: SVGAnimatedNumberList;
-    readonly x: SVGAnimatedLengthList;
-    readonly y: SVGAnimatedLengthList;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTextPositioningElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTextPositioningElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGTextPositioningElement: {
-    prototype: SVGTextPositioningElement;
-    new(): SVGTextPositioningElement;
-};
-
-interface SVGTitleElement extends SVGElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTitleElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTitleElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGTitleElement: {
-    prototype: SVGTitleElement;
-    new(): SVGTitleElement;
-};
-
-interface SVGTransform {
-    readonly angle: number;
-    readonly matrix: SVGMatrix;
-    readonly type: number;
-    setMatrix(matrix: SVGMatrix): void;
-    setRotate(angle: number, cx: number, cy: number): void;
-    setScale(sx: number, sy: number): void;
-    setSkewX(angle: number): void;
-    setSkewY(angle: number): void;
-    setTranslate(tx: number, ty: number): void;
-    readonly SVG_TRANSFORM_MATRIX: number;
-    readonly SVG_TRANSFORM_ROTATE: number;
-    readonly SVG_TRANSFORM_SCALE: number;
-    readonly SVG_TRANSFORM_SKEWX: number;
-    readonly SVG_TRANSFORM_SKEWY: number;
-    readonly SVG_TRANSFORM_TRANSLATE: number;
-    readonly SVG_TRANSFORM_UNKNOWN: number;
-}
-
-declare var SVGTransform: {
-    prototype: SVGTransform;
-    new(): SVGTransform;
-    readonly SVG_TRANSFORM_MATRIX: number;
-    readonly SVG_TRANSFORM_ROTATE: number;
-    readonly SVG_TRANSFORM_SCALE: number;
-    readonly SVG_TRANSFORM_SKEWX: number;
-    readonly SVG_TRANSFORM_SKEWY: number;
-    readonly SVG_TRANSFORM_TRANSLATE: number;
-    readonly SVG_TRANSFORM_UNKNOWN: number;
-};
-
-interface SVGTransformList {
-    readonly numberOfItems: number;
-    appendItem(newItem: SVGTransform): SVGTransform;
-    clear(): void;
-    consolidate(): SVGTransform;
-    createSVGTransformFromMatrix(matrix: SVGMatrix): SVGTransform;
-    getItem(index: number): SVGTransform;
-    initialize(newItem: SVGTransform): SVGTransform;
-    insertItemBefore(newItem: SVGTransform, index: number): SVGTransform;
-    removeItem(index: number): SVGTransform;
-    replaceItem(newItem: SVGTransform, index: number): SVGTransform;
-}
-
-declare var SVGTransformList: {
-    prototype: SVGTransformList;
-    new(): SVGTransformList;
-};
-
-interface SVGURIReference {
-    readonly href: SVGAnimatedString;
-}
-
-interface SVGUnitTypes {
-    readonly SVG_UNIT_TYPE_OBJECTBOUNDINGBOX: number;
-    readonly SVG_UNIT_TYPE_UNKNOWN: number;
-    readonly SVG_UNIT_TYPE_USERSPACEONUSE: number;
-}
-declare var SVGUnitTypes: SVGUnitTypes;
-
-interface SVGUseElement extends SVGGraphicsElement, SVGURIReference {
-    readonly animatedInstanceRoot: SVGElementInstance | null;
-    readonly height: SVGAnimatedLength;
-    readonly instanceRoot: SVGElementInstance | null;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGUseElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGUseElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGUseElement: {
-    prototype: SVGUseElement;
-    new(): SVGUseElement;
-};
-
-interface SVGViewElement extends SVGElement, SVGFitToViewBox, SVGZoomAndPan {
-    /** @deprecated */
-    readonly viewTarget: SVGStringList;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGViewElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGViewElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGViewElement: {
-    prototype: SVGViewElement;
-    new(): SVGViewElement;
-};
-
-interface SVGZoomAndPan {
-    readonly zoomAndPan: number;
-}
-
-declare var SVGZoomAndPan: {
-    readonly SVG_ZOOMANDPAN_DISABLE: number;
-    readonly SVG_ZOOMANDPAN_MAGNIFY: number;
-    readonly SVG_ZOOMANDPAN_UNKNOWN: number;
-};
-
-interface SVGZoomEvent extends UIEvent {
-    readonly newScale: number;
-    readonly newTranslate: SVGPoint;
-    readonly previousScale: number;
-    readonly previousTranslate: SVGPoint;
-    readonly zoomRectScreen: SVGRect;
-}
-
-declare var SVGZoomEvent: {
-    prototype: SVGZoomEvent;
-    new(): SVGZoomEvent;
-};
-
-interface ScopedCredential {
-    readonly id: ArrayBuffer;
-    readonly type: ScopedCredentialType;
-}
-
-declare var ScopedCredential: {
-    prototype: ScopedCredential;
-    new(): ScopedCredential;
-};
-
-interface ScopedCredentialInfo {
-    readonly credential: ScopedCredential;
-    readonly publicKey: CryptoKey;
-}
-
-declare var ScopedCredentialInfo: {
-    prototype: ScopedCredentialInfo;
-    new(): ScopedCredentialInfo;
-};
-
-interface ScreenEventMap {
-    "MSOrientationChange": Event;
-}
-
-interface Screen extends EventTarget {
-    readonly availHeight: number;
-    readonly availWidth: number;
-    /** @deprecated */
-    bufferDepth: number;
-    readonly colorDepth: number;
-    readonly deviceXDPI: number;
-    readonly deviceYDPI: number;
-    readonly fontSmoothingEnabled: boolean;
-    readonly height: number;
-    readonly logicalXDPI: number;
-    readonly logicalYDPI: number;
-    readonly msOrientation: string;
-    onmsorientationchange: ((this: Screen, ev: Event) => any) | null;
-    readonly pixelDepth: number;
-    readonly systemXDPI: number;
-    readonly systemYDPI: number;
-    readonly width: number;
-    lockOrientation(orientations: OrientationLockType | OrientationLockType[]): boolean;
-    msLockOrientation(orientations: string | string[]): boolean;
-    msUnlockOrientation(): void;
-    unlockOrientation(): void;
-    addEventListener<K extends keyof ScreenEventMap>(type: K, listener: (this: Screen, ev: ScreenEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof ScreenEventMap>(type: K, listener: (this: Screen, ev: ScreenEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var Screen: {
-    prototype: Screen;
-    new(): Screen;
-};
-
-interface ScriptProcessorNodeEventMap {
-    "audioprocess": AudioProcessingEvent;
-}
-
-interface ScriptProcessorNode extends AudioNode {
-    /** @deprecated */
-    readonly bufferSize: number;
-    /** @deprecated */
-    onaudioprocess: ((this: ScriptProcessorNode, ev: AudioProcessingEvent) => any) | null;
-    addEventListener<K extends keyof ScriptProcessorNodeEventMap>(type: K, listener: (this: ScriptProcessorNode, ev: ScriptProcessorNodeEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof ScriptProcessorNodeEventMap>(type: K, listener: (this: ScriptProcessorNode, ev: ScriptProcessorNodeEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var ScriptProcessorNode: {
-    prototype: ScriptProcessorNode;
-    new(): ScriptProcessorNode;
-};
-
-interface ScrollIntoViewOptions extends ScrollOptions {
-    block?: ScrollLogicalPosition;
-    inline?: ScrollLogicalPosition;
-}
-
-interface ScrollOptions {
-    behavior?: ScrollBehavior;
-}
-
-interface ScrollToOptions extends ScrollOptions {
-    left?: number;
-    top?: number;
-}
-
-interface SecurityPolicyViolationEvent extends Event {
-    readonly blockedURI: string;
-    readonly columnNumber: number;
-    readonly documentURI: string;
-    readonly effectiveDirective: string;
-    readonly lineNumber: number;
-    readonly originalPolicy: string;
-    readonly referrer: string;
-    readonly sourceFile: string;
-    readonly statusCode: number;
-    readonly violatedDirective: string;
-}
-
-declare var SecurityPolicyViolationEvent: {
-    prototype: SecurityPolicyViolationEvent;
-    new(type: string, eventInitDict?: SecurityPolicyViolationEventInit): SecurityPolicyViolationEvent;
-};
-
-interface Selection {
-    readonly anchorNode: Node;
-    readonly anchorOffset: number;
-    readonly baseNode: Node;
-    readonly baseOffset: number;
-    readonly extentNode: Node;
-    readonly extentOffset: number;
-    readonly focusNode: Node;
-    readonly focusOffset: number;
-    readonly isCollapsed: boolean;
-    readonly rangeCount: number;
-    readonly type: string;
-    addRange(range: Range): void;
-    collapse(parentNode: Node, offset: number): void;
-    collapseToEnd(): void;
-    collapseToStart(): void;
-    containsNode(node: Node, partlyContained: boolean): boolean;
-    deleteFromDocument(): void;
-    empty(): void;
-    extend(newNode: Node, offset: number): void;
-    getRangeAt(index: number): Range;
-    removeAllRanges(): void;
-    removeRange(range: Range): void;
-    selectAllChildren(parentNode: Node): void;
-    setBaseAndExtent(baseNode: Node, baseOffset: number, extentNode: Node, extentOffset: number): void;
-    setPosition(parentNode: Node, offset: number): void;
-    toString(): string;
-}
-
-declare var Selection: {
-    prototype: Selection;
-    new(): Selection;
-};
-
-interface ServiceUIFrameContext {
-    getCachedFrameMessage(key: string): string;
-    postFrameMessage(key: string, data: string): void;
-}
-declare var ServiceUIFrameContext: ServiceUIFrameContext;
-
-interface ServiceWorkerEventMap extends AbstractWorkerEventMap {
-    "statechange": Event;
-}
-
-interface ServiceWorker extends EventTarget, AbstractWorker {
-    onstatechange: ((this: ServiceWorker, ev: Event) => any) | null;
-    readonly scriptURL: string;
-    readonly state: ServiceWorkerState;
-    postMessage(message: any, transfer?: any[]): void;
-    addEventListener<K extends keyof ServiceWorkerEventMap>(type: K, listener: (this: ServiceWorker, ev: ServiceWorkerEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof ServiceWorkerEventMap>(type: K, listener: (this: ServiceWorker, ev: ServiceWorkerEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var ServiceWorker: {
-    prototype: ServiceWorker;
-    new(): ServiceWorker;
-};
-
-interface ServiceWorkerContainerEventMap {
-    "controllerchange": Event;
-    "message": ServiceWorkerMessageEvent;
-    "messageerror": MessageEvent;
-}
-
-interface ServiceWorkerContainer extends EventTarget {
-    readonly controller: ServiceWorker | null;
-    oncontrollerchange: ((this: ServiceWorkerContainer, ev: Event) => any) | null;
-    onmessage: ((this: ServiceWorkerContainer, ev: ServiceWorkerMessageEvent) => any) | null;
-    onmessageerror: ((this: ServiceWorkerContainer, ev: MessageEvent) => any) | null;
-    readonly ready: Promise<ServiceWorkerRegistration>;
-    getRegistration(clientURL?: string): Promise<ServiceWorkerRegistration | undefined>;
-    getRegistrations(): Promise<ServiceWorkerRegistration[]>;
-    register(scriptURL: string, options?: RegistrationOptions): Promise<ServiceWorkerRegistration>;
-    startMessages(): void;
-    addEventListener<K extends keyof ServiceWorkerContainerEventMap>(type: K, listener: (this: ServiceWorkerContainer, ev: ServiceWorkerContainerEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof ServiceWorkerContainerEventMap>(type: K, listener: (this: ServiceWorkerContainer, ev: ServiceWorkerContainerEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var ServiceWorkerContainer: {
-    prototype: ServiceWorkerContainer;
-    new(): ServiceWorkerContainer;
-};
-
-interface ServiceWorkerMessageEvent extends Event {
-    readonly data: any;
-    readonly lastEventId: string;
-    readonly origin: string;
-    readonly ports: ReadonlyArray<MessagePort> | null;
-    readonly source: ServiceWorker | MessagePort | null;
-}
-
-declare var ServiceWorkerMessageEvent: {
-    prototype: ServiceWorkerMessageEvent;
-    new(type: string, eventInitDict?: ServiceWorkerMessageEventInit): ServiceWorkerMessageEvent;
-};
-
-interface ServiceWorkerRegistrationEventMap {
-    "updatefound": Event;
-}
-
-interface ServiceWorkerRegistration extends EventTarget {
-    readonly active: ServiceWorker | null;
-    readonly installing: ServiceWorker | null;
-    onupdatefound: ((this: ServiceWorkerRegistration, ev: Event) => any) | null;
-    readonly pushManager: PushManager;
-    readonly scope: string;
-    readonly sync: SyncManager;
-    readonly waiting: ServiceWorker | null;
-    getNotifications(filter?: GetNotificationOptions): Promise<Notification[]>;
-    showNotification(title: string, options?: NotificationOptions): Promise<void>;
-    unregister(): Promise<boolean>;
-    update(): Promise<void>;
-    addEventListener<K extends keyof ServiceWorkerRegistrationEventMap>(type: K, listener: (this: ServiceWorkerRegistration, ev: ServiceWorkerRegistrationEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof ServiceWorkerRegistrationEventMap>(type: K, listener: (this: ServiceWorkerRegistration, ev: ServiceWorkerRegistrationEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var ServiceWorkerRegistration: {
-    prototype: ServiceWorkerRegistration;
-    new(): ServiceWorkerRegistration;
-};
-
-interface ShadowRoot extends DocumentOrShadowRoot, DocumentFragment {
-    readonly host: Element;
-    innerHTML: string;
-}
-
-interface ShadowRootInit {
-    delegatesFocus?: boolean;
-    mode: "open" | "closed";
-}
-
-interface SourceBuffer extends EventTarget {
-    appendWindowEnd: number;
-    appendWindowStart: number;
-    readonly audioTracks: AudioTrackList;
-    readonly buffered: TimeRanges;
-    mode: AppendMode;
-    readonly textTracks: TextTrackList;
-    timestampOffset: number;
-    readonly updating: boolean;
-    readonly videoTracks: VideoTrackList;
-    abort(): void;
-    appendBuffer(data: ArrayBuffer | Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | null): void;
-    appendStream(stream: MSStream, maxSize?: number): void;
-    remove(start: number, end: number): void;
-}
-
-declare var SourceBuffer: {
-    prototype: SourceBuffer;
-    new(): SourceBuffer;
-};
-
-interface SourceBufferList extends EventTarget {
-    readonly length: number;
-    item(index: number): SourceBuffer;
-    [index: number]: SourceBuffer;
-}
-
-declare var SourceBufferList: {
-    prototype: SourceBufferList;
-    new(): SourceBufferList;
-};
-
-interface SpeechSynthesisEventMap {
-    "voiceschanged": Event;
-}
-
-interface SpeechSynthesis extends EventTarget {
-    onvoiceschanged: ((this: SpeechSynthesis, ev: Event) => any) | null;
-    readonly paused: boolean;
-    readonly pending: boolean;
-    readonly speaking: boolean;
-    cancel(): void;
-    getVoices(): SpeechSynthesisVoice[];
-    pause(): void;
-    resume(): void;
-    speak(utterance: SpeechSynthesisUtterance): void;
-    addEventListener<K extends keyof SpeechSynthesisEventMap>(type: K, listener: (this: SpeechSynthesis, ev: SpeechSynthesisEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SpeechSynthesisEventMap>(type: K, listener: (this: SpeechSynthesis, ev: SpeechSynthesisEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SpeechSynthesis: {
-    prototype: SpeechSynthesis;
-    new(): SpeechSynthesis;
-};
-
-interface SpeechSynthesisEvent extends Event {
-    readonly charIndex: number;
-    readonly charLength: number;
-    readonly elapsedTime: number;
-    readonly name: string;
-    readonly utterance: SpeechSynthesisUtterance;
-}
-
-declare var SpeechSynthesisEvent: {
-    prototype: SpeechSynthesisEvent;
-    new(type: string, eventInitDict?: SpeechSynthesisEventInit): SpeechSynthesisEvent;
-};
-
-interface SpeechSynthesisUtteranceEventMap {
-    "boundary": Event;
-    "end": Event;
-    "error": Event;
-    "mark": Event;
-    "pause": Event;
-    "resume": Event;
-    "start": Event;
-}
-
-interface SpeechSynthesisUtterance extends EventTarget {
-    lang: string;
-    onboundary: ((this: SpeechSynthesisUtterance, ev: Event) => any) | null;
-    onend: ((this: SpeechSynthesisUtterance, ev: Event) => any) | null;
-    onerror: ((this: SpeechSynthesisUtterance, ev: Event) => any) | null;
-    onmark: ((this: SpeechSynthesisUtterance, ev: Event) => any) | null;
-    onpause: ((this: SpeechSynthesisUtterance, ev: Event) => any) | null;
-    onresume: ((this: SpeechSynthesisUtterance, ev: Event) => any) | null;
-    onstart: ((this: SpeechSynthesisUtterance, ev: Event) => any) | null;
-    pitch: number;
-    rate: number;
-    text: string;
-    voice: SpeechSynthesisVoice;
-    volume: number;
-    addEventListener<K extends keyof SpeechSynthesisUtteranceEventMap>(type: K, listener: (this: SpeechSynthesisUtterance, ev: SpeechSynthesisUtteranceEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SpeechSynthesisUtteranceEventMap>(type: K, listener: (this: SpeechSynthesisUtterance, ev: SpeechSynthesisUtteranceEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SpeechSynthesisUtterance: {
-    prototype: SpeechSynthesisUtterance;
-    new(): SpeechSynthesisUtterance;
-    new(text: string): SpeechSynthesisUtterance;
-};
-
-interface SpeechSynthesisVoice {
-    readonly default: boolean;
-    readonly lang: string;
-    readonly localService: boolean;
-    readonly name: string;
-    readonly voiceURI: string;
-}
-
-declare var SpeechSynthesisVoice: {
-    prototype: SpeechSynthesisVoice;
-    new(): SpeechSynthesisVoice;
-};
-
-interface StereoPannerNode extends AudioNode {
-    readonly pan: AudioParam;
-}
-
-declare var StereoPannerNode: {
-    prototype: StereoPannerNode;
-    new(): StereoPannerNode;
-};
-
-interface Storage {
-    readonly length: number;
-    clear(): void;
-    getItem(key: string): string | null;
-    key(index: number): string | null;
-    removeItem(key: string): void;
-    setItem(key: string, value: string): void;
-    [key: string]: any;
-}
-
-declare var Storage: {
-    prototype: Storage;
-    new(): Storage;
-};
-
-interface StorageEvent extends Event {
-    readonly key: string | null;
-    readonly newValue: string | null;
-    readonly oldValue: string | null;
-    readonly storageArea: Storage | null;
-    readonly url: string;
-}
-
-declare var StorageEvent: {
-    prototype: StorageEvent;
-    new (type: string, eventInitDict?: StorageEventInit): StorageEvent;
-};
-
-interface StorageEventInit extends EventInit {
-    key?: string;
-    newValue?: string;
-    oldValue?: string;
-    storageArea?: Storage;
-    url: string;
-}
-
-interface StyleMedia {
-    readonly type: string;
-    matchMedium(mediaquery: string): boolean;
-}
-
-declare var StyleMedia: {
-    prototype: StyleMedia;
-    new(): StyleMedia;
-};
-
-interface StyleSheet {
-    disabled: boolean;
-    readonly href: string | null;
-    readonly media: MediaList;
-    readonly ownerNode: Node;
-    readonly parentStyleSheet: StyleSheet | null;
-    readonly title: string | null;
-    readonly type: string;
-}
-
-declare var StyleSheet: {
-    prototype: StyleSheet;
-    new(): StyleSheet;
-};
-
-interface StyleSheetList {
-    readonly length: number;
-    item(index: number): StyleSheet | null;
-    [index: number]: StyleSheet;
-}
-
-declare var StyleSheetList: {
-    prototype: StyleSheetList;
-    new(): StyleSheetList;
-};
-
-interface SubtleCrypto {
-    decrypt(algorithm: string | RsaOaepParams | AesCtrParams | AesCbcParams | AesCmacParams | AesGcmParams | AesCfbParams, key: CryptoKey, data: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer): PromiseLike<ArrayBuffer>;
-    deriveBits(algorithm: string | EcdhKeyDeriveParams | DhKeyDeriveParams | ConcatParams | HkdfCtrParams | Pbkdf2Params, baseKey: CryptoKey, length: number): PromiseLike<ArrayBuffer>;
-    deriveKey(algorithm: string | EcdhKeyDeriveParams | DhKeyDeriveParams | ConcatParams | HkdfCtrParams | Pbkdf2Params, baseKey: CryptoKey, derivedKeyType: string | AesDerivedKeyParams | HmacImportParams | ConcatParams | HkdfCtrParams | Pbkdf2Params, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKey>;
-    digest(algorithm: string | Algorithm, data: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer): PromiseLike<ArrayBuffer>;
-    encrypt(algorithm: string | RsaOaepParams | AesCtrParams | AesCbcParams | AesCmacParams | AesGcmParams | AesCfbParams, key: CryptoKey, data: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer): PromiseLike<ArrayBuffer>;
-    exportKey(format: "jwk", key: CryptoKey): PromiseLike<JsonWebKey>;
-    exportKey(format: "raw" | "pkcs8" | "spki", key: CryptoKey): PromiseLike<ArrayBuffer>;
-    exportKey(format: string, key: CryptoKey): PromiseLike<JsonWebKey | ArrayBuffer>;
-    generateKey(algorithm: string, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKeyPair | CryptoKey>;
-    generateKey(algorithm: RsaHashedKeyGenParams | EcKeyGenParams | DhKeyGenParams, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKeyPair>;
-    generateKey(algorithm: AesKeyGenParams | HmacKeyGenParams | Pbkdf2Params, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKey>;
-    importKey(format: "jwk", keyData: JsonWebKey, algorithm: string | RsaHashedImportParams | EcKeyImportParams | HmacImportParams | DhImportKeyParams, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKey>;
-    importKey(format: "raw" | "pkcs8" | "spki", keyData: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer, algorithm: string | RsaHashedImportParams | EcKeyImportParams | HmacImportParams | DhImportKeyParams, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKey>;
-    importKey(format: string, keyData: JsonWebKey | Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer, algorithm: string | RsaHashedImportParams | EcKeyImportParams | HmacImportParams | DhImportKeyParams, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKey>;
-    sign(algorithm: string | RsaPssParams | EcdsaParams | AesCmacParams, key: CryptoKey, data: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer): PromiseLike<ArrayBuffer>;
-    unwrapKey(format: string, wrappedKey: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer, unwrappingKey: CryptoKey, unwrapAlgorithm: string | Algorithm, unwrappedKeyAlgorithm: string | Algorithm, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKey>;
-    verify(algorithm: string | RsaPssParams | EcdsaParams | AesCmacParams, key: CryptoKey, signature: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer, data: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer): PromiseLike<boolean>;
-    wrapKey(format: string, key: CryptoKey, wrappingKey: CryptoKey, wrapAlgorithm: string | Algorithm): PromiseLike<ArrayBuffer>;
-}
-
-declare var SubtleCrypto: {
-    prototype: SubtleCrypto;
-    new(): SubtleCrypto;
-};
-
-interface SyncManager {
-    getTags(): Promise<string[]>;
-    register(tag: string): Promise<void>;
-}
-
-declare var SyncManager: {
-    prototype: SyncManager;
-    new(): SyncManager;
-};
-
-interface Text extends CharacterData {
-    readonly assignedSlot: HTMLSlotElement | null;
-    readonly wholeText: string;
-    splitText(offset: number): Text;
-}
-
-declare var Text: {
-    prototype: Text;
-    new(data?: string): Text;
-};
-
-interface TextDecoder {
-    readonly encoding: string;
-    readonly fatal: boolean;
-    readonly ignoreBOM: boolean;
-    decode(input?: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null, options?: TextDecodeOptions): string;
-}
-
-declare var TextDecoder: {
-    prototype: TextDecoder;
-    new(label?: string, options?: TextDecoderOptions): TextDecoder;
-};
-
-interface TextEncoder {
-    readonly encoding: string;
-    encode(input?: string): Uint8Array;
-}
-
-declare var TextEncoder: {
-    prototype: TextEncoder;
-    new(): TextEncoder;
-};
-
-interface TextEvent extends UIEvent {
-    readonly data: string;
-    initTextEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, dataArg: string, inputMethod: number, locale: string): void;
-    readonly DOM_INPUT_METHOD_DROP: number;
-    readonly DOM_INPUT_METHOD_HANDWRITING: number;
-    readonly DOM_INPUT_METHOD_IME: number;
-    readonly DOM_INPUT_METHOD_KEYBOARD: number;
-    readonly DOM_INPUT_METHOD_MULTIMODAL: number;
-    readonly DOM_INPUT_METHOD_OPTION: number;
-    readonly DOM_INPUT_METHOD_PASTE: number;
-    readonly DOM_INPUT_METHOD_SCRIPT: number;
-    readonly DOM_INPUT_METHOD_UNKNOWN: number;
-    readonly DOM_INPUT_METHOD_VOICE: number;
-}
-
-declare var TextEvent: {
-    prototype: TextEvent;
-    new(): TextEvent;
-    readonly DOM_INPUT_METHOD_DROP: number;
-    readonly DOM_INPUT_METHOD_HANDWRITING: number;
-    readonly DOM_INPUT_METHOD_IME: number;
-    readonly DOM_INPUT_METHOD_KEYBOARD: number;
-    readonly DOM_INPUT_METHOD_MULTIMODAL: number;
-    readonly DOM_INPUT_METHOD_OPTION: number;
-    readonly DOM_INPUT_METHOD_PASTE: number;
-    readonly DOM_INPUT_METHOD_SCRIPT: number;
-    readonly DOM_INPUT_METHOD_UNKNOWN: number;
-    readonly DOM_INPUT_METHOD_VOICE: number;
-};
-
-interface TextMetrics {
-    readonly width: number;
-}
-
-declare var TextMetrics: {
-    prototype: TextMetrics;
-    new(): TextMetrics;
-};
-
-interface TextTrackEventMap {
-    "cuechange": Event;
-    "error": Event;
-    "load": Event;
-}
-
-interface TextTrack extends EventTarget {
-    readonly activeCues: TextTrackCueList;
-    readonly cues: TextTrackCueList;
-    readonly inBandMetadataTrackDispatchType: string;
-    readonly kind: string;
-    readonly label: string;
-    readonly language: string;
-    mode: TextTrackMode | number;
-    oncuechange: ((this: TextTrack, ev: Event) => any) | null;
-    onerror: ((this: TextTrack, ev: Event) => any) | null;
-    onload: ((this: TextTrack, ev: Event) => any) | null;
-    readonly readyState: number;
-    addCue(cue: TextTrackCue): void;
-    removeCue(cue: TextTrackCue): void;
-    readonly DISABLED: number;
-    readonly ERROR: number;
-    readonly HIDDEN: number;
-    readonly LOADED: number;
-    readonly LOADING: number;
-    readonly NONE: number;
-    readonly SHOWING: number;
-    addEventListener<K extends keyof TextTrackEventMap>(type: K, listener: (this: TextTrack, ev: TextTrackEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof TextTrackEventMap>(type: K, listener: (this: TextTrack, ev: TextTrackEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var TextTrack: {
-    prototype: TextTrack;
-    new(): TextTrack;
-    readonly DISABLED: number;
-    readonly ERROR: number;
-    readonly HIDDEN: number;
-    readonly LOADED: number;
-    readonly LOADING: number;
-    readonly NONE: number;
-    readonly SHOWING: number;
-};
-
-interface TextTrackCueEventMap {
-    "enter": Event;
-    "exit": Event;
-}
-
-interface TextTrackCue extends EventTarget {
-    endTime: number;
-    id: string;
-    onenter: ((this: TextTrackCue, ev: Event) => any) | null;
-    onexit: ((this: TextTrackCue, ev: Event) => any) | null;
-    pauseOnExit: boolean;
-    startTime: number;
-    text: string;
-    readonly track: TextTrack;
-    getCueAsHTML(): DocumentFragment;
-    addEventListener<K extends keyof TextTrackCueEventMap>(type: K, listener: (this: TextTrackCue, ev: TextTrackCueEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof TextTrackCueEventMap>(type: K, listener: (this: TextTrackCue, ev: TextTrackCueEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var TextTrackCue: {
-    prototype: TextTrackCue;
-    new(startTime: number, endTime: number, text: string): TextTrackCue;
-};
-
-interface TextTrackCueList {
-    readonly length: number;
-    getCueById(id: string): TextTrackCue;
-    item(index: number): TextTrackCue;
-    [index: number]: TextTrackCue;
-}
-
-declare var TextTrackCueList: {
-    prototype: TextTrackCueList;
-    new(): TextTrackCueList;
-};
-
-interface TextTrackListEventMap {
-    "addtrack": TrackEvent;
-}
-
-interface TextTrackList extends EventTarget {
-    readonly length: number;
-    onaddtrack: ((this: TextTrackList, ev: TrackEvent) => any) | null;
-    item(index: number): TextTrack;
-    addEventListener<K extends keyof TextTrackListEventMap>(type: K, listener: (this: TextTrackList, ev: TextTrackListEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof TextTrackListEventMap>(type: K, listener: (this: TextTrackList, ev: TextTrackListEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-    [index: number]: TextTrack;
-}
-
-declare var TextTrackList: {
-    prototype: TextTrackList;
-    new(): TextTrackList;
-};
-
-interface TimeRanges {
-    readonly length: number;
-    end(index: number): number;
-    start(index: number): number;
-}
-
-declare var TimeRanges: {
-    prototype: TimeRanges;
-    new(): TimeRanges;
-};
-
-interface Touch {
-    readonly clientX: number;
-    readonly clientY: number;
-    readonly identifier: number;
-    readonly pageX: number;
-    readonly pageY: number;
-    readonly screenX: number;
-    readonly screenY: number;
-    readonly target: EventTarget;
-}
-
-declare var Touch: {
-    prototype: Touch;
-    new(): Touch;
-};
-
-interface TouchEvent extends UIEvent {
-    readonly altKey: boolean;
-    readonly changedTouches: TouchList;
-    readonly charCode: number;
-    readonly ctrlKey: boolean;
-    readonly keyCode: number;
-    readonly metaKey: boolean;
-    readonly shiftKey: boolean;
-    readonly targetTouches: TouchList;
-    readonly touches: TouchList;
-    /** @deprecated */
-    readonly which: number;
-}
-
-declare var TouchEvent: {
-    prototype: TouchEvent;
-    new(type: string, touchEventInit?: TouchEventInit): TouchEvent;
-};
-
-interface TouchEventInit extends EventModifierInit {
-    changedTouches?: Touch[];
-    targetTouches?: Touch[];
-    touches?: Touch[];
-}
-
-interface TouchList {
-    readonly length: number;
-    item(index: number): Touch | null;
-    [index: number]: Touch;
-}
-
-declare var TouchList: {
-    prototype: TouchList;
-    new(): TouchList;
-};
-
-interface TrackEvent extends Event {
-    readonly track: VideoTrack | AudioTrack | TextTrack | null;
-}
-
-declare var TrackEvent: {
-    prototype: TrackEvent;
-    new(typeArg: string, eventInitDict?: TrackEventInit): TrackEvent;
-};
-
-interface TransitionEvent extends Event {
-    readonly elapsedTime: number;
-    readonly propertyName: string;
-    initTransitionEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, propertyNameArg: string, elapsedTimeArg: number): void;
-}
-
-declare var TransitionEvent: {
-    prototype: TransitionEvent;
-    new(typeArg: string, eventInitDict?: TransitionEventInit): TransitionEvent;
-};
-
-interface TreeWalker {
-    currentNode: Node;
-    /** @deprecated */
-    readonly expandEntityReferences: boolean;
-    readonly filter: NodeFilter | null;
-    readonly root: Node;
-    readonly whatToShow: number;
-    firstChild(): Node | null;
-    lastChild(): Node | null;
-    nextNode(): Node | null;
-    nextSibling(): Node | null;
-    parentNode(): Node | null;
-    previousNode(): Node | null;
-    previousSibling(): Node | null;
-}
-
-declare var TreeWalker: {
-    prototype: TreeWalker;
-    new(): TreeWalker;
-};
-
-interface UIEvent extends Event {
-    readonly detail: number;
-    readonly view: Window;
-    initUIEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number): void;
-}
-
-declare var UIEvent: {
-    prototype: UIEvent;
-    new(typeArg: string, eventInitDict?: UIEventInit): UIEvent;
-};
-
-interface URL {
-    hash: string;
-    host: string;
-    hostname: string;
-    href: string;
-    readonly origin: string;
-    password: string;
-    pathname: string;
-    port: string;
-    protocol: string;
-    search: string;
-    readonly searchParams: URLSearchParams;
-    username: string;
-    toString(): string;
-}
-
-declare var URL: {
-    prototype: URL;
-    new(url: string, base?: string | URL): URL;
-    createObjectURL(object: any, options?: ObjectURLOptions): string;
-    revokeObjectURL(url: string): void;
-};
-
-interface URLSearchParams {
-    /**
-     * Appends a specified key/value pair as a new search parameter.
-     */
-    append(name: string, value: string): void;
-    /**
-     * Deletes the given search parameter, and its associated value, from the list of all search parameters.
-     */
-    delete(name: string): void;
-    /**
-     * Returns the first value associated to the given search parameter.
-     */
-    get(name: string): string | null;
-    /**
-     * Returns all the values association with a given search parameter.
-     */
-    getAll(name: string): string[];
-    /**
-     * Returns a Boolean indicating if such a search parameter exists.
-     */
-    has(name: string): boolean;
-    /**
-     * Sets the value associated to a given search parameter to the given value. If there were several values, delete the others.
-     */
-    set(name: string, value: string): void;
-}
-
-declare var URLSearchParams: {
-    prototype: URLSearchParams;
-    new (init?: string | URLSearchParams): URLSearchParams;
-};
-
-interface VRDisplay extends EventTarget {
-    readonly capabilities: VRDisplayCapabilities;
-    depthFar: number;
-    depthNear: number;
-    readonly displayId: number;
-    readonly displayName: string;
-    readonly isConnected: boolean;
-    readonly isPresenting: boolean;
-    readonly stageParameters: VRStageParameters | null;
-    cancelAnimationFrame(handle: number): void;
-    exitPresent(): Promise<void>;
-    getEyeParameters(whichEye: string): VREyeParameters;
-    getFrameData(frameData: VRFrameData): boolean;
-    getLayers(): VRLayer[];
-    /** @deprecated */
-    getPose(): VRPose;
-    requestAnimationFrame(callback: FrameRequestCallback): number;
-    requestPresent(layers: VRLayer[]): Promise<void>;
-    resetPose(): void;
-    submitFrame(pose?: VRPose): void;
-}
-
-declare var VRDisplay: {
-    prototype: VRDisplay;
-    new(): VRDisplay;
-};
-
-interface VRDisplayCapabilities {
-    readonly canPresent: boolean;
-    readonly hasExternalDisplay: boolean;
-    readonly hasOrientation: boolean;
-    readonly hasPosition: boolean;
-    readonly maxLayers: number;
-}
-
-declare var VRDisplayCapabilities: {
-    prototype: VRDisplayCapabilities;
-    new(): VRDisplayCapabilities;
-};
-
-interface VRDisplayEvent extends Event {
-    readonly display: VRDisplay;
-    readonly reason: VRDisplayEventReason | null;
-}
-
-declare var VRDisplayEvent: {
-    prototype: VRDisplayEvent;
-    new(type: string, eventInitDict: VRDisplayEventInit): VRDisplayEvent;
-};
-
-interface VREyeParameters {
-    /** @deprecated */
-    readonly fieldOfView: VRFieldOfView;
-    readonly offset: Float32Array;
-    readonly renderHeight: number;
-    readonly renderWidth: number;
-}
-
-declare var VREyeParameters: {
-    prototype: VREyeParameters;
-    new(): VREyeParameters;
-};
-
-interface VRFieldOfView {
-    readonly downDegrees: number;
-    readonly leftDegrees: number;
-    readonly rightDegrees: number;
-    readonly upDegrees: number;
-}
-
-declare var VRFieldOfView: {
-    prototype: VRFieldOfView;
-    new(): VRFieldOfView;
-};
-
-interface VRFrameData {
-    readonly leftProjectionMatrix: Float32Array;
-    readonly leftViewMatrix: Float32Array;
-    readonly pose: VRPose;
-    readonly rightProjectionMatrix: Float32Array;
-    readonly rightViewMatrix: Float32Array;
-    readonly timestamp: number;
-}
-
-declare var VRFrameData: {
-    prototype: VRFrameData;
-    new(): VRFrameData;
-};
-
-interface VRPose {
-    readonly angularAcceleration: Float32Array | null;
-    readonly angularVelocity: Float32Array | null;
-    readonly linearAcceleration: Float32Array | null;
-    readonly linearVelocity: Float32Array | null;
-    readonly orientation: Float32Array | null;
-    readonly position: Float32Array | null;
-    readonly timestamp: number;
-}
-
-declare var VRPose: {
-    prototype: VRPose;
-    new(): VRPose;
-};
-
-interface ValidityState {
-    readonly badInput: boolean;
-    readonly customError: boolean;
-    readonly patternMismatch: boolean;
-    readonly rangeOverflow: boolean;
-    readonly rangeUnderflow: boolean;
-    readonly stepMismatch: boolean;
-    readonly tooLong: boolean;
-    readonly tooShort: boolean;
-    readonly typeMismatch: boolean;
-    readonly valid: boolean;
-    readonly valueMissing: boolean;
-}
-
-declare var ValidityState: {
-    prototype: ValidityState;
-    new(): ValidityState;
-};
-
-interface VideoPlaybackQuality {
-    readonly corruptedVideoFrames: number;
-    readonly creationTime: number;
-    readonly droppedVideoFrames: number;
-    readonly totalFrameDelay: number;
-    readonly totalVideoFrames: number;
-}
-
-declare var VideoPlaybackQuality: {
-    prototype: VideoPlaybackQuality;
-    new(): VideoPlaybackQuality;
-};
-
-interface VideoTrack {
-    readonly id: string;
-    kind: string;
-    readonly label: string;
-    language: string;
-    selected: boolean;
-    readonly sourceBuffer: SourceBuffer;
-}
-
-declare var VideoTrack: {
-    prototype: VideoTrack;
-    new(): VideoTrack;
-};
-
-interface VideoTrackListEventMap {
-    "addtrack": TrackEvent;
-    "change": Event;
-    "removetrack": TrackEvent;
-}
-
-interface VideoTrackList extends EventTarget {
-    readonly length: number;
-    onaddtrack: ((this: VideoTrackList, ev: TrackEvent) => any) | null;
-    onchange: ((this: VideoTrackList, ev: Event) => any) | null;
-    onremovetrack: ((this: VideoTrackList, ev: TrackEvent) => any) | null;
-    readonly selectedIndex: number;
-    getTrackById(id: string): VideoTrack | null;
-    item(index: number): VideoTrack;
-    addEventListener<K extends keyof VideoTrackListEventMap>(type: K, listener: (this: VideoTrackList, ev: VideoTrackListEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof VideoTrackListEventMap>(type: K, listener: (this: VideoTrackList, ev: VideoTrackListEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-    [index: number]: VideoTrack;
-}
-
-declare var VideoTrackList: {
-    prototype: VideoTrackList;
-    new(): VideoTrackList;
-};
-
-interface WEBGL_color_buffer_float {
-    readonly FRAMEBUFFER_ATTACHMENT_COMPONENT_TYPE_EXT: number;
-    readonly RGB32F_EXT: number;
-    readonly RGBA32F_EXT: number;
-    readonly UNSIGNED_NORMALIZED_EXT: number;
-}
-
-interface WEBGL_compressed_texture_astc {
-    readonly COMPRESSED_RGBA_ASTC_10x10_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_10x5_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_10x6_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_10x8_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_12x10_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_12x12_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_4x4_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_5x4_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_5x5_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_6x5_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_6x6_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_8x5_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_8x6_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_8x8_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_10x10_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_10x5_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_10x6_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_10x8_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_12x10_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_12x12_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_4x4_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_5x4_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_5x5_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_6x5_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_6x6_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_8x5_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_8x6_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_8x8_KHR: number;
-    getSupportedProfiles(): string[];
-}
-
-interface WEBGL_compressed_texture_s3tc {
-    readonly COMPRESSED_RGBA_S3TC_DXT1_EXT: number;
-    readonly COMPRESSED_RGBA_S3TC_DXT3_EXT: number;
-    readonly COMPRESSED_RGBA_S3TC_DXT5_EXT: number;
-    readonly COMPRESSED_RGB_S3TC_DXT1_EXT: number;
-}
-
-declare var WEBGL_compressed_texture_s3tc: {
-    prototype: WEBGL_compressed_texture_s3tc;
-    new(): WEBGL_compressed_texture_s3tc;
-    readonly COMPRESSED_RGBA_S3TC_DXT1_EXT: number;
-    readonly COMPRESSED_RGBA_S3TC_DXT3_EXT: number;
-    readonly COMPRESSED_RGBA_S3TC_DXT5_EXT: number;
-    readonly COMPRESSED_RGB_S3TC_DXT1_EXT: number;
-};
-
-interface WEBGL_compressed_texture_s3tc_srgb {
-    readonly COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT: number;
-    readonly COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT: number;
-    readonly COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT: number;
-    readonly COMPRESSED_SRGB_S3TC_DXT1_EXT: number;
-}
-
-interface WEBGL_debug_renderer_info {
-    readonly UNMASKED_RENDERER_WEBGL: number;
-    readonly UNMASKED_VENDOR_WEBGL: number;
-}
-
-declare var WEBGL_debug_renderer_info: {
-    prototype: WEBGL_debug_renderer_info;
-    new(): WEBGL_debug_renderer_info;
-    readonly UNMASKED_RENDERER_WEBGL: number;
-    readonly UNMASKED_VENDOR_WEBGL: number;
-};
-
-interface WEBGL_debug_shaders {
-    getTranslatedShaderSource(shader: WebGLShader): string;
-}
-
-interface WEBGL_depth_texture {
-    readonly UNSIGNED_INT_24_8_WEBGL: number;
-}
-
-declare var WEBGL_depth_texture: {
-    prototype: WEBGL_depth_texture;
-    new(): WEBGL_depth_texture;
-    readonly UNSIGNED_INT_24_8_WEBGL: number;
-};
-
-interface WEBGL_draw_buffers {
-    readonly COLOR_ATTACHMENT0_WEBGL: number;
-    readonly COLOR_ATTACHMENT10_WEBGL: number;
-    readonly COLOR_ATTACHMENT11_WEBGL: number;
-    readonly COLOR_ATTACHMENT12_WEBGL: number;
-    readonly COLOR_ATTACHMENT13_WEBGL: number;
-    readonly COLOR_ATTACHMENT14_WEBGL: number;
-    readonly COLOR_ATTACHMENT15_WEBGL: number;
-    readonly COLOR_ATTACHMENT1_WEBGL: number;
-    readonly COLOR_ATTACHMENT2_WEBGL: number;
-    readonly COLOR_ATTACHMENT3_WEBGL: number;
-    readonly COLOR_ATTACHMENT4_WEBGL: number;
-    readonly COLOR_ATTACHMENT5_WEBGL: number;
-    readonly COLOR_ATTACHMENT6_WEBGL: number;
-    readonly COLOR_ATTACHMENT7_WEBGL: number;
-    readonly COLOR_ATTACHMENT8_WEBGL: number;
-    readonly COLOR_ATTACHMENT9_WEBGL: number;
-    readonly DRAW_BUFFER0_WEBGL: number;
-    readonly DRAW_BUFFER10_WEBGL: number;
-    readonly DRAW_BUFFER11_WEBGL: number;
-    readonly DRAW_BUFFER12_WEBGL: number;
-    readonly DRAW_BUFFER13_WEBGL: number;
-    readonly DRAW_BUFFER14_WEBGL: number;
-    readonly DRAW_BUFFER15_WEBGL: number;
-    readonly DRAW_BUFFER1_WEBGL: number;
-    readonly DRAW_BUFFER2_WEBGL: number;
-    readonly DRAW_BUFFER3_WEBGL: number;
-    readonly DRAW_BUFFER4_WEBGL: number;
-    readonly DRAW_BUFFER5_WEBGL: number;
-    readonly DRAW_BUFFER6_WEBGL: number;
-    readonly DRAW_BUFFER7_WEBGL: number;
-    readonly DRAW_BUFFER8_WEBGL: number;
-    readonly DRAW_BUFFER9_WEBGL: number;
-    readonly MAX_COLOR_ATTACHMENTS_WEBGL: number;
-    readonly MAX_DRAW_BUFFERS_WEBGL: number;
-    drawBuffersWEBGL(buffers: number[]): void;
-}
-
-interface WEBGL_lose_context {
-    loseContext(): void;
-    restoreContext(): void;
-}
-
-interface WaveShaperNode extends AudioNode {
-    curve: Float32Array | null;
-    oversample: OverSampleType;
-}
-
-declare var WaveShaperNode: {
-    prototype: WaveShaperNode;
-    new(): WaveShaperNode;
-};
-
-interface WebAuthentication {
-    getAssertion(assertionChallenge: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null, options?: AssertionOptions): Promise<WebAuthnAssertion>;
-    makeCredential(accountInformation: Account, cryptoParameters: ScopedCredentialParameters[], attestationChallenge: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null, options?: ScopedCredentialOptions): Promise<ScopedCredentialInfo>;
-}
-
-declare var WebAuthentication: {
-    prototype: WebAuthentication;
-    new(): WebAuthentication;
-};
-
-interface WebAuthnAssertion {
-    readonly authenticatorData: ArrayBuffer;
-    readonly clientData: ArrayBuffer;
-    readonly credential: ScopedCredential;
-    readonly signature: ArrayBuffer;
-}
-
-declare var WebAuthnAssertion: {
-    prototype: WebAuthnAssertion;
-    new(): WebAuthnAssertion;
-};
-
-interface WebGLActiveInfo {
-    readonly name: string;
-    readonly size: number;
-    readonly type: number;
-}
-
-declare var WebGLActiveInfo: {
-    prototype: WebGLActiveInfo;
-    new(): WebGLActiveInfo;
-};
-
-interface WebGLBuffer extends WebGLObject {
-}
-
-declare var WebGLBuffer: {
-    prototype: WebGLBuffer;
-    new(): WebGLBuffer;
-};
-
-interface WebGLContextEvent extends Event {
-    readonly statusMessage: string;
-}
-
-declare var WebGLContextEvent: {
-    prototype: WebGLContextEvent;
-    new(typeArg: string, eventInitDict?: WebGLContextEventInit): WebGLContextEvent;
-};
-
-interface WebGLFramebuffer extends WebGLObject {
-}
-
-declare var WebGLFramebuffer: {
-    prototype: WebGLFramebuffer;
-    new(): WebGLFramebuffer;
-};
-
-interface WebGLObject {
-}
-
-declare var WebGLObject: {
-    prototype: WebGLObject;
-    new(): WebGLObject;
-};
-
-interface WebGLProgram extends WebGLObject {
-}
-
-declare var WebGLProgram: {
-    prototype: WebGLProgram;
-    new(): WebGLProgram;
-};
-
-interface WebGLRenderbuffer extends WebGLObject {
-}
-
-declare var WebGLRenderbuffer: {
-    prototype: WebGLRenderbuffer;
-    new(): WebGLRenderbuffer;
-};
-
-interface WebGLRenderingContext {
-    readonly canvas: HTMLCanvasElement;
-    readonly drawingBufferHeight: number;
-    readonly drawingBufferWidth: number;
-    activeTexture(texture: number): void;
-    attachShader(program: WebGLProgram | null, shader: WebGLShader | null): void;
-    bindAttribLocation(program: WebGLProgram | null, index: number, name: string): void;
-    bindBuffer(target: number, buffer: WebGLBuffer | null): void;
-    bindFramebuffer(target: number, framebuffer: WebGLFramebuffer | null): void;
-    bindRenderbuffer(target: number, renderbuffer: WebGLRenderbuffer | null): void;
-    bindTexture(target: number, texture: WebGLTexture | null): void;
-    blendColor(red: number, green: number, blue: number, alpha: number): void;
-    blendEquation(mode: number): void;
-    blendEquationSeparate(modeRGB: number, modeAlpha: number): void;
-    blendFunc(sfactor: number, dfactor: number): void;
-    blendFuncSeparate(srcRGB: number, dstRGB: number, srcAlpha: number, dstAlpha: number): void;
-    bufferData(target: number, size: number | Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null, usage: number): void;
-    bufferSubData(target: number, offset: number, data: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null): void;
-    checkFramebufferStatus(target: number): number;
-    clear(mask: number): void;
-    clearColor(red: number, green: number, blue: number, alpha: number): void;
-    clearDepth(depth: number): void;
-    clearStencil(s: number): void;
-    colorMask(red: boolean, green: boolean, blue: boolean, alpha: boolean): void;
-    compileShader(shader: WebGLShader | null): void;
-    compressedTexImage2D(target: number, level: number, internalformat: number, width: number, height: number, border: number, data: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | null): void;
-    compressedTexSubImage2D(target: number, level: number, xoffset: number, yoffset: number, width: number, height: number, format: number, data: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | null): void;
-    copyTexImage2D(target: number, level: number, internalformat: number, x: number, y: number, width: number, height: number, border: number): void;
-    copyTexSubImage2D(target: number, level: number, xoffset: number, yoffset: number, x: number, y: number, width: number, height: number): void;
-    createBuffer(): WebGLBuffer | null;
-    createFramebuffer(): WebGLFramebuffer | null;
-    createProgram(): WebGLProgram | null;
-    createRenderbuffer(): WebGLRenderbuffer | null;
-    createShader(type: number): WebGLShader | null;
-    createTexture(): WebGLTexture | null;
-    cullFace(mode: number): void;
-    deleteBuffer(buffer: WebGLBuffer | null): void;
-    deleteFramebuffer(framebuffer: WebGLFramebuffer | null): void;
-    deleteProgram(program: WebGLProgram | null): void;
-    deleteRenderbuffer(renderbuffer: WebGLRenderbuffer | null): void;
-    deleteShader(shader: WebGLShader | null): void;
-    deleteTexture(texture: WebGLTexture | null): void;
-    depthFunc(func: number): void;
-    depthMask(flag: boolean): void;
-    depthRange(zNear: number, zFar: number): void;
-    detachShader(program: WebGLProgram | null, shader: WebGLShader | null): void;
-    disable(cap: number): void;
-    disableVertexAttribArray(index: number): void;
-    drawArrays(mode: number, first: number, count: number): void;
-    drawElements(mode: number, count: number, type: number, offset: number): void;
-    enable(cap: number): void;
-    enableVertexAttribArray(index: number): void;
-    finish(): void;
-    flush(): void;
-    framebufferRenderbuffer(target: number, attachment: number, renderbuffertarget: number, renderbuffer: WebGLRenderbuffer | null): void;
-    framebufferTexture2D(target: number, attachment: number, textarget: number, texture: WebGLTexture | null, level: number): void;
-    frontFace(mode: number): void;
-    generateMipmap(target: number): void;
-    getActiveAttrib(program: WebGLProgram | null, index: number): WebGLActiveInfo | null;
-    getActiveUniform(program: WebGLProgram | null, index: number): WebGLActiveInfo | null;
-    getAttachedShaders(program: WebGLProgram | null): WebGLShader[] | null;
-    getAttribLocation(program: WebGLProgram | null, name: string): number;
-    getBufferParameter(target: number, pname: number): any;
-    getContextAttributes(): WebGLContextAttributes;
-    getError(): number;
-    getExtension(extensionName: "EXT_blend_minmax"): EXT_blend_minmax | null;
-    getExtension(extensionName: "EXT_texture_filter_anisotropic"): EXT_texture_filter_anisotropic | null;
-    getExtension(extensionName: "EXT_frag_depth"): EXT_frag_depth | null;
-    getExtension(extensionName: "EXT_shader_texture_lod"): EXT_shader_texture_lod | null;
-    getExtension(extensionName: "EXT_sRGB"): EXT_sRGB | null;
-    getExtension(extensionName: "OES_vertex_array_object"): OES_vertex_array_object | null;
-    getExtension(extensionName: "WEBGL_color_buffer_float"): WEBGL_color_buffer_float | null;
-    getExtension(extensionName: "WEBGL_compressed_texture_astc"): WEBGL_compressed_texture_astc | null;
-    getExtension(extensionName: "WEBGL_compressed_texture_s3tc_srgb"): WEBGL_compressed_texture_s3tc_srgb | null;
-    getExtension(extensionName: "WEBGL_debug_shaders"): WEBGL_debug_shaders | null;
-    getExtension(extensionName: "WEBGL_draw_buffers"): WEBGL_draw_buffers | null;
-    getExtension(extensionName: "WEBGL_lose_context"): WEBGL_lose_context | null;
-    getExtension(extensionName: "WEBGL_depth_texture"): WEBGL_depth_texture | null;
-    getExtension(extensionName: "WEBGL_debug_renderer_info"): WEBGL_debug_renderer_info | null;
-    getExtension(extensionName: "WEBGL_compressed_texture_s3tc"): WEBGL_compressed_texture_s3tc | null;
-    getExtension(extensionName: "OES_texture_half_float_linear"): OES_texture_half_float_linear | null;
-    getExtension(extensionName: "OES_texture_half_float"): OES_texture_half_float | null;
-    getExtension(extensionName: "OES_texture_float_linear"): OES_texture_float_linear | null;
-    getExtension(extensionName: "OES_texture_float"): OES_texture_float | null;
-    getExtension(extensionName: "OES_standard_derivatives"): OES_standard_derivatives | null;
-    getExtension(extensionName: "OES_element_index_uint"): OES_element_index_uint | null;
-    getExtension(extensionName: "ANGLE_instanced_arrays"): ANGLE_instanced_arrays | null;
-    getExtension(extensionName: string): any;
-    getFramebufferAttachmentParameter(target: number, attachment: number, pname: number): any;
-    getParameter(pname: number): any;
-    getProgramInfoLog(program: WebGLProgram | null): string | null;
-    getProgramParameter(program: WebGLProgram | null, pname: number): any;
-    getRenderbufferParameter(target: number, pname: number): any;
-    getShaderInfoLog(shader: WebGLShader | null): string | null;
-    getShaderParameter(shader: WebGLShader | null, pname: number): any;
-    getShaderPrecisionFormat(shadertype: number, precisiontype: number): WebGLShaderPrecisionFormat | null;
-    getShaderSource(shader: WebGLShader | null): string | null;
-    getSupportedExtensions(): string[] | null;
-    getTexParameter(target: number, pname: number): any;
-    getUniform(program: WebGLProgram | null, location: WebGLUniformLocation | null): any;
-    getUniformLocation(program: WebGLProgram | null, name: string): WebGLUniformLocation | null;
-    getVertexAttrib(index: number, pname: number): any;
-    getVertexAttribOffset(index: number, pname: number): number;
-    hint(target: number, mode: number): void;
-    isBuffer(buffer: WebGLBuffer | null): boolean;
-    isContextLost(): boolean;
-    isEnabled(cap: number): boolean;
-    isFramebuffer(framebuffer: WebGLFramebuffer | null): boolean;
-    isProgram(program: WebGLProgram | null): boolean;
-    isRenderbuffer(renderbuffer: WebGLRenderbuffer | null): boolean;
-    isShader(shader: WebGLShader | null): boolean;
-    isTexture(texture: WebGLTexture | null): boolean;
-    lineWidth(width: number): void;
-    linkProgram(program: WebGLProgram | null): void;
-    pixelStorei(pname: number, param: number | boolean): void;
-    polygonOffset(factor: number, units: number): void;
-    readPixels(x: number, y: number, width: number, height: number, format: number, type: number, pixels: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | null): void;
-    renderbufferStorage(target: number, internalformat: number, width: number, height: number): void;
-    sampleCoverage(value: number, invert: boolean): void;
-    scissor(x: number, y: number, width: number, height: number): void;
-    shaderSource(shader: WebGLShader | null, source: string): void;
-    stencilFunc(func: number, ref: number, mask: number): void;
-    stencilFuncSeparate(face: number, func: number, ref: number, mask: number): void;
-    stencilMask(mask: number): void;
-    stencilMaskSeparate(face: number, mask: number): void;
-    stencilOp(fail: number, zfail: number, zpass: number): void;
-    stencilOpSeparate(face: number, fail: number, zfail: number, zpass: number): void;
-    texImage2D(target: number, level: number, internalformat: number, width: number, height: number, border: number, format: number, type: number, pixels: ArrayBufferView | null): void;
-    texImage2D(target: number, level: number, internalformat: number, format: number, type: number, pixels: ImageBitmap | ImageData | HTMLVideoElement | HTMLImageElement | HTMLCanvasElement): void;
-    texParameterf(target: number, pname: number, param: number): void;
-    texParameteri(target: number, pname: number, param: number): void;
-    texSubImage2D(target: number, level: number, xoffset: number, yoffset: number, width: number, height: number, format: number, type: number, pixels: ArrayBufferView | null): void;
-    texSubImage2D(target: number, level: number, xoffset: number, yoffset: number, format: number, type: number, pixels: ImageBitmap | ImageData | HTMLVideoElement | HTMLImageElement | HTMLCanvasElement): void;
-    uniform1f(location: WebGLUniformLocation | null, x: number): void;
-    uniform1fv(location: WebGLUniformLocation | null, v: Float32Array | ArrayLike<number>): void;
-    uniform1i(location: WebGLUniformLocation | null, x: number): void;
-    uniform1iv(location: WebGLUniformLocation | null, v: Int32Array | ArrayLike<number>): void;
-    uniform2f(location: WebGLUniformLocation | null, x: number, y: number): void;
-    uniform2fv(location: WebGLUniformLocation | null, v: Float32Array | ArrayLike<number>): void;
-    uniform2i(location: WebGLUniformLocation | null, x: number, y: number): void;
-    uniform2iv(location: WebGLUniformLocation | null, v: Int32Array | ArrayLike<number>): void;
-    uniform3f(location: WebGLUniformLocation | null, x: number, y: number, z: number): void;
-    uniform3fv(location: WebGLUniformLocation | null, v: Float32Array | ArrayLike<number>): void;
-    uniform3i(location: WebGLUniformLocation | null, x: number, y: number, z: number): void;
-    uniform3iv(location: WebGLUniformLocation | null, v: Int32Array | ArrayLike<number>): void;
-    uniform4f(location: WebGLUniformLocation | null, x: number, y: number, z: number, w: number): void;
-    uniform4fv(location: WebGLUniformLocation | null, v: Float32Array | ArrayLike<number>): void;
-    uniform4i(location: WebGLUniformLocation | null, x: number, y: number, z: number, w: number): void;
-    uniform4iv(location: WebGLUniformLocation | null, v: Int32Array | ArrayLike<number>): void;
-    uniformMatrix2fv(location: WebGLUniformLocation | null, transpose: boolean, value: Float32Array | ArrayLike<number>): void;
-    uniformMatrix3fv(location: WebGLUniformLocation | null, transpose: boolean, value: Float32Array | ArrayLike<number>): void;
-    uniformMatrix4fv(location: WebGLUniformLocation | null, transpose: boolean, value: Float32Array | ArrayLike<number>): void;
-    useProgram(program: WebGLProgram | null): void;
-    validateProgram(program: WebGLProgram | null): void;
-    vertexAttrib1f(indx: number, x: number): void;
-    vertexAttrib1fv(indx: number, values: Float32Array | number[]): void;
-    vertexAttrib2f(indx: number, x: number, y: number): void;
-    vertexAttrib2fv(indx: number, values: Float32Array | number[]): void;
-    vertexAttrib3f(indx: number, x: number, y: number, z: number): void;
-    vertexAttrib3fv(indx: number, values: Float32Array | number[]): void;
-    vertexAttrib4f(indx: number, x: number, y: number, z: number, w: number): void;
-    vertexAttrib4fv(indx: number, values: Float32Array | number[]): void;
-    vertexAttribPointer(indx: number, size: number, type: number, normalized: boolean, stride: number, offset: number): void;
-    viewport(x: number, y: number, width: number, height: number): void;
-    readonly ACTIVE_ATTRIBUTES: number;
-    readonly ACTIVE_TEXTURE: number;
-    readonly ACTIVE_UNIFORMS: number;
-    readonly ALIASED_LINE_WIDTH_RANGE: number;
-    readonly ALIASED_POINT_SIZE_RANGE: number;
-    readonly ALPHA: number;
-    readonly ALPHA_BITS: number;
-    readonly ALWAYS: number;
-    readonly ARRAY_BUFFER: number;
-    readonly ARRAY_BUFFER_BINDING: number;
-    readonly ATTACHED_SHADERS: number;
-    readonly BACK: number;
-    readonly BLEND: number;
-    readonly BLEND_COLOR: number;
-    readonly BLEND_DST_ALPHA: number;
-    readonly BLEND_DST_RGB: number;
-    readonly BLEND_EQUATION: number;
-    readonly BLEND_EQUATION_ALPHA: number;
-    readonly BLEND_EQUATION_RGB: number;
-    readonly BLEND_SRC_ALPHA: number;
-    readonly BLEND_SRC_RGB: number;
-    readonly BLUE_BITS: number;
-    readonly BOOL: number;
-    readonly BOOL_VEC2: number;
-    readonly BOOL_VEC3: number;
-    readonly BOOL_VEC4: number;
-    readonly BROWSER_DEFAULT_WEBGL: number;
-    readonly BUFFER_SIZE: number;
-    readonly BUFFER_USAGE: number;
-    readonly BYTE: number;
-    readonly CCW: number;
-    readonly CLAMP_TO_EDGE: number;
-    readonly COLOR_ATTACHMENT0: number;
-    readonly COLOR_BUFFER_BIT: number;
-    readonly COLOR_CLEAR_VALUE: number;
-    readonly COLOR_WRITEMASK: number;
-    readonly COMPILE_STATUS: number;
-    readonly COMPRESSED_TEXTURE_FORMATS: number;
-    readonly CONSTANT_ALPHA: number;
-    readonly CONSTANT_COLOR: number;
-    readonly CONTEXT_LOST_WEBGL: number;
-    readonly CULL_FACE: number;
-    readonly CULL_FACE_MODE: number;
-    readonly CURRENT_PROGRAM: number;
-    readonly CURRENT_VERTEX_ATTRIB: number;
-    readonly CW: number;
-    readonly DECR: number;
-    readonly DECR_WRAP: number;
-    readonly DELETE_STATUS: number;
-    readonly DEPTH_ATTACHMENT: number;
-    readonly DEPTH_BITS: number;
-    readonly DEPTH_BUFFER_BIT: number;
-    readonly DEPTH_CLEAR_VALUE: number;
-    readonly DEPTH_COMPONENT: number;
-    readonly DEPTH_COMPONENT16: number;
-    readonly DEPTH_FUNC: number;
-    readonly DEPTH_RANGE: number;
-    readonly DEPTH_STENCIL: number;
-    readonly DEPTH_STENCIL_ATTACHMENT: number;
-    readonly DEPTH_TEST: number;
-    readonly DEPTH_WRITEMASK: number;
-    readonly DITHER: number;
-    readonly DONT_CARE: number;
-    readonly DST_ALPHA: number;
-    readonly DST_COLOR: number;
-    readonly DYNAMIC_DRAW: number;
-    readonly ELEMENT_ARRAY_BUFFER: number;
-    readonly ELEMENT_ARRAY_BUFFER_BINDING: number;
-    readonly EQUAL: number;
-    readonly FASTEST: number;
-    readonly FLOAT: number;
-    readonly FLOAT_MAT2: number;
-    readonly FLOAT_MAT3: number;
-    readonly FLOAT_MAT4: number;
-    readonly FLOAT_VEC2: number;
-    readonly FLOAT_VEC3: number;
-    readonly FLOAT_VEC4: number;
-    readonly FRAGMENT_SHADER: number;
-    readonly FRAMEBUFFER: number;
-    readonly FRAMEBUFFER_ATTACHMENT_OBJECT_NAME: number;
-    readonly FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE: number;
-    readonly FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACE: number;
-    readonly FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL: number;
-    readonly FRAMEBUFFER_BINDING: number;
-    readonly FRAMEBUFFER_COMPLETE: number;
-    readonly FRAMEBUFFER_INCOMPLETE_ATTACHMENT: number;
-    readonly FRAMEBUFFER_INCOMPLETE_DIMENSIONS: number;
-    readonly FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT: number;
-    readonly FRAMEBUFFER_UNSUPPORTED: number;
-    readonly FRONT: number;
-    readonly FRONT_AND_BACK: number;
-    readonly FRONT_FACE: number;
-    readonly FUNC_ADD: number;
-    readonly FUNC_REVERSE_SUBTRACT: number;
-    readonly FUNC_SUBTRACT: number;
-    readonly GENERATE_MIPMAP_HINT: number;
-    readonly GEQUAL: number;
-    readonly GREATER: number;
-    readonly GREEN_BITS: number;
-    readonly HIGH_FLOAT: number;
-    readonly HIGH_INT: number;
-    readonly IMPLEMENTATION_COLOR_READ_FORMAT: number;
-    readonly IMPLEMENTATION_COLOR_READ_TYPE: number;
-    readonly INCR: number;
-    readonly INCR_WRAP: number;
-    readonly INT: number;
-    readonly INT_VEC2: number;
-    readonly INT_VEC3: number;
-    readonly INT_VEC4: number;
-    readonly INVALID_ENUM: number;
-    readonly INVALID_FRAMEBUFFER_OPERATION: number;
-    readonly INVALID_OPERATION: number;
-    readonly INVALID_VALUE: number;
-    readonly INVERT: number;
-    readonly KEEP: number;
-    readonly LEQUAL: number;
-    readonly LESS: number;
-    readonly LINEAR: number;
-    readonly LINEAR_MIPMAP_LINEAR: number;
-    readonly LINEAR_MIPMAP_NEAREST: number;
-    readonly LINES: number;
-    readonly LINE_LOOP: number;
-    readonly LINE_STRIP: number;
-    readonly LINE_WIDTH: number;
-    readonly LINK_STATUS: number;
-    readonly LOW_FLOAT: number;
-    readonly LOW_INT: number;
-    readonly LUMINANCE: number;
-    readonly LUMINANCE_ALPHA: number;
-    readonly MAX_COMBINED_TEXTURE_IMAGE_UNITS: number;
-    readonly MAX_CUBE_MAP_TEXTURE_SIZE: number;
-    readonly MAX_FRAGMENT_UNIFORM_VECTORS: number;
-    readonly MAX_RENDERBUFFER_SIZE: number;
-    readonly MAX_TEXTURE_IMAGE_UNITS: number;
-    readonly MAX_TEXTURE_SIZE: number;
-    readonly MAX_VARYING_VECTORS: number;
-    readonly MAX_VERTEX_ATTRIBS: number;
-    readonly MAX_VERTEX_TEXTURE_IMAGE_UNITS: number;
-    readonly MAX_VERTEX_UNIFORM_VECTORS: number;
-    readonly MAX_VIEWPORT_DIMS: number;
-    readonly MEDIUM_FLOAT: number;
-    readonly MEDIUM_INT: number;
-    readonly MIRRORED_REPEAT: number;
-    readonly NEAREST: number;
-    readonly NEAREST_MIPMAP_LINEAR: number;
-    readonly NEAREST_MIPMAP_NEAREST: number;
-    readonly NEVER: number;
-    readonly NICEST: number;
-    readonly NONE: number;
-    readonly NOTEQUAL: number;
-    readonly NO_ERROR: number;
-    readonly ONE: number;
-    readonly ONE_MINUS_CONSTANT_ALPHA: number;
-    readonly ONE_MINUS_CONSTANT_COLOR: number;
-    readonly ONE_MINUS_DST_ALPHA: number;
-    readonly ONE_MINUS_DST_COLOR: number;
-    readonly ONE_MINUS_SRC_ALPHA: number;
-    readonly ONE_MINUS_SRC_COLOR: number;
-    readonly OUT_OF_MEMORY: number;
-    readonly PACK_ALIGNMENT: number;
-    readonly POINTS: number;
-    readonly POLYGON_OFFSET_FACTOR: number;
-    readonly POLYGON_OFFSET_FILL: number;
-    readonly POLYGON_OFFSET_UNITS: number;
-    readonly RED_BITS: number;
-    readonly RENDERBUFFER: number;
-    readonly RENDERBUFFER_ALPHA_SIZE: number;
-    readonly RENDERBUFFER_BINDING: number;
-    readonly RENDERBUFFER_BLUE_SIZE: number;
-    readonly RENDERBUFFER_DEPTH_SIZE: number;
-    readonly RENDERBUFFER_GREEN_SIZE: number;
-    readonly RENDERBUFFER_HEIGHT: number;
-    readonly RENDERBUFFER_INTERNAL_FORMAT: number;
-    readonly RENDERBUFFER_RED_SIZE: number;
-    readonly RENDERBUFFER_STENCIL_SIZE: number;
-    readonly RENDERBUFFER_WIDTH: number;
-    readonly RENDERER: number;
-    readonly REPEAT: number;
-    readonly REPLACE: number;
-    readonly RGB: number;
-    readonly RGB565: number;
-    readonly RGB5_A1: number;
-    readonly RGBA: number;
-    readonly RGBA4: number;
-    readonly SAMPLER_2D: number;
-    readonly SAMPLER_CUBE: number;
-    readonly SAMPLES: number;
-    readonly SAMPLE_ALPHA_TO_COVERAGE: number;
-    readonly SAMPLE_BUFFERS: number;
-    readonly SAMPLE_COVERAGE: number;
-    readonly SAMPLE_COVERAGE_INVERT: number;
-    readonly SAMPLE_COVERAGE_VALUE: number;
-    readonly SCISSOR_BOX: number;
-    readonly SCISSOR_TEST: number;
-    readonly SHADER_TYPE: number;
-    readonly SHADING_LANGUAGE_VERSION: number;
-    readonly SHORT: number;
-    readonly SRC_ALPHA: number;
-    readonly SRC_ALPHA_SATURATE: number;
-    readonly SRC_COLOR: number;
-    readonly STATIC_DRAW: number;
-    readonly STENCIL_ATTACHMENT: number;
-    readonly STENCIL_BACK_FAIL: number;
-    readonly STENCIL_BACK_FUNC: number;
-    readonly STENCIL_BACK_PASS_DEPTH_FAIL: number;
-    readonly STENCIL_BACK_PASS_DEPTH_PASS: number;
-    readonly STENCIL_BACK_REF: number;
-    readonly STENCIL_BACK_VALUE_MASK: number;
-    readonly STENCIL_BACK_WRITEMASK: number;
-    readonly STENCIL_BITS: number;
-    readonly STENCIL_BUFFER_BIT: number;
-    readonly STENCIL_CLEAR_VALUE: number;
-    readonly STENCIL_FAIL: number;
-    readonly STENCIL_FUNC: number;
-    readonly STENCIL_INDEX: number;
-    readonly STENCIL_INDEX8: number;
-    readonly STENCIL_PASS_DEPTH_FAIL: number;
-    readonly STENCIL_PASS_DEPTH_PASS: number;
-    readonly STENCIL_REF: number;
-    readonly STENCIL_TEST: number;
-    readonly STENCIL_VALUE_MASK: number;
-    readonly STENCIL_WRITEMASK: number;
-    readonly STREAM_DRAW: number;
-    readonly SUBPIXEL_BITS: number;
-    readonly TEXTURE: number;
-    readonly TEXTURE0: number;
-    readonly TEXTURE1: number;
-    readonly TEXTURE10: number;
-    readonly TEXTURE11: number;
-    readonly TEXTURE12: number;
-    readonly TEXTURE13: number;
-    readonly TEXTURE14: number;
-    readonly TEXTURE15: number;
-    readonly TEXTURE16: number;
-    readonly TEXTURE17: number;
-    readonly TEXTURE18: number;
-    readonly TEXTURE19: number;
-    readonly TEXTURE2: number;
-    readonly TEXTURE20: number;
-    readonly TEXTURE21: number;
-    readonly TEXTURE22: number;
-    readonly TEXTURE23: number;
-    readonly TEXTURE24: number;
-    readonly TEXTURE25: number;
-    readonly TEXTURE26: number;
-    readonly TEXTURE27: number;
-    readonly TEXTURE28: number;
-    readonly TEXTURE29: number;
-    readonly TEXTURE3: number;
-    readonly TEXTURE30: number;
-    readonly TEXTURE31: number;
-    readonly TEXTURE4: number;
-    readonly TEXTURE5: number;
-    readonly TEXTURE6: number;
-    readonly TEXTURE7: number;
-    readonly TEXTURE8: number;
-    readonly TEXTURE9: number;
-    readonly TEXTURE_2D: number;
-    readonly TEXTURE_BINDING_2D: number;
-    readonly TEXTURE_BINDING_CUBE_MAP: number;
-    readonly TEXTURE_CUBE_MAP: number;
-    readonly TEXTURE_CUBE_MAP_NEGATIVE_X: number;
-    readonly TEXTURE_CUBE_MAP_NEGATIVE_Y: number;
-    readonly TEXTURE_CUBE_MAP_NEGATIVE_Z: number;
-    readonly TEXTURE_CUBE_MAP_POSITIVE_X: number;
-    readonly TEXTURE_CUBE_MAP_POSITIVE_Y: number;
-    readonly TEXTURE_CUBE_MAP_POSITIVE_Z: number;
-    readonly TEXTURE_MAG_FILTER: number;
-    readonly TEXTURE_MIN_FILTER: number;
-    readonly TEXTURE_WRAP_S: number;
-    readonly TEXTURE_WRAP_T: number;
-    readonly TRIANGLES: number;
-    readonly TRIANGLE_FAN: number;
-    readonly TRIANGLE_STRIP: number;
-    readonly UNPACK_ALIGNMENT: number;
-    readonly UNPACK_COLORSPACE_CONVERSION_WEBGL: number;
-    readonly UNPACK_FLIP_Y_WEBGL: number;
-    readonly UNPACK_PREMULTIPLY_ALPHA_WEBGL: number;
-    readonly UNSIGNED_BYTE: number;
-    readonly UNSIGNED_INT: number;
-    readonly UNSIGNED_SHORT: number;
-    readonly UNSIGNED_SHORT_4_4_4_4: number;
-    readonly UNSIGNED_SHORT_5_5_5_1: number;
-    readonly UNSIGNED_SHORT_5_6_5: number;
-    readonly VALIDATE_STATUS: number;
-    readonly VENDOR: number;
-    readonly VERSION: number;
-    readonly VERTEX_ATTRIB_ARRAY_BUFFER_BINDING: number;
-    readonly VERTEX_ATTRIB_ARRAY_ENABLED: number;
-    readonly VERTEX_ATTRIB_ARRAY_NORMALIZED: number;
-    readonly VERTEX_ATTRIB_ARRAY_POINTER: number;
-    readonly VERTEX_ATTRIB_ARRAY_SIZE: number;
-    readonly VERTEX_ATTRIB_ARRAY_STRIDE: number;
-    readonly VERTEX_ATTRIB_ARRAY_TYPE: number;
-    readonly VERTEX_SHADER: number;
-    readonly VIEWPORT: number;
-    readonly ZERO: number;
-}
-
-declare var WebGLRenderingContext: {
-    prototype: WebGLRenderingContext;
-    new(): WebGLRenderingContext;
-    readonly ACTIVE_ATTRIBUTES: number;
-    readonly ACTIVE_TEXTURE: number;
-    readonly ACTIVE_UNIFORMS: number;
-    readonly ALIASED_LINE_WIDTH_RANGE: number;
-    readonly ALIASED_POINT_SIZE_RANGE: number;
-    readonly ALPHA: number;
-    readonly ALPHA_BITS: number;
-    readonly ALWAYS: number;
-    readonly ARRAY_BUFFER: number;
-    readonly ARRAY_BUFFER_BINDING: number;
-    readonly ATTACHED_SHADERS: number;
-    readonly BACK: number;
-    readonly BLEND: number;
-    readonly BLEND_COLOR: number;
-    readonly BLEND_DST_ALPHA: number;
-    readonly BLEND_DST_RGB: number;
-    readonly BLEND_EQUATION: number;
-    readonly BLEND_EQUATION_ALPHA: number;
-    readonly BLEND_EQUATION_RGB: number;
-    readonly BLEND_SRC_ALPHA: number;
-    readonly BLEND_SRC_RGB: number;
-    readonly BLUE_BITS: number;
-    readonly BOOL: number;
-    readonly BOOL_VEC2: number;
-    readonly BOOL_VEC3: number;
-    readonly BOOL_VEC4: number;
-    readonly BROWSER_DEFAULT_WEBGL: number;
-    readonly BUFFER_SIZE: number;
-    readonly BUFFER_USAGE: number;
-    readonly BYTE: number;
-    readonly CCW: number;
-    readonly CLAMP_TO_EDGE: number;
-    readonly COLOR_ATTACHMENT0: number;
-    readonly COLOR_BUFFER_BIT: number;
-    readonly COLOR_CLEAR_VALUE: number;
-    readonly COLOR_WRITEMASK: number;
-    readonly COMPILE_STATUS: number;
-    readonly COMPRESSED_TEXTURE_FORMATS: number;
-    readonly CONSTANT_ALPHA: number;
-    readonly CONSTANT_COLOR: number;
-    readonly CONTEXT_LOST_WEBGL: number;
-    readonly CULL_FACE: number;
-    readonly CULL_FACE_MODE: number;
-    readonly CURRENT_PROGRAM: number;
-    readonly CURRENT_VERTEX_ATTRIB: number;
-    readonly CW: number;
-    readonly DECR: number;
-    readonly DECR_WRAP: number;
-    readonly DELETE_STATUS: number;
-    readonly DEPTH_ATTACHMENT: number;
-    readonly DEPTH_BITS: number;
-    readonly DEPTH_BUFFER_BIT: number;
-    readonly DEPTH_CLEAR_VALUE: number;
-    readonly DEPTH_COMPONENT: number;
-    readonly DEPTH_COMPONENT16: number;
-    readonly DEPTH_FUNC: number;
-    readonly DEPTH_RANGE: number;
-    readonly DEPTH_STENCIL: number;
-    readonly DEPTH_STENCIL_ATTACHMENT: number;
-    readonly DEPTH_TEST: number;
-    readonly DEPTH_WRITEMASK: number;
-    readonly DITHER: number;
-    readonly DONT_CARE: number;
-    readonly DST_ALPHA: number;
-    readonly DST_COLOR: number;
-    readonly DYNAMIC_DRAW: number;
-    readonly ELEMENT_ARRAY_BUFFER: number;
-    readonly ELEMENT_ARRAY_BUFFER_BINDING: number;
-    readonly EQUAL: number;
-    readonly FASTEST: number;
-    readonly FLOAT: number;
-    readonly FLOAT_MAT2: number;
-    readonly FLOAT_MAT3: number;
-    readonly FLOAT_MAT4: number;
-    readonly FLOAT_VEC2: number;
-    readonly FLOAT_VEC3: number;
-    readonly FLOAT_VEC4: number;
-    readonly FRAGMENT_SHADER: number;
-    readonly FRAMEBUFFER: number;
-    readonly FRAMEBUFFER_ATTACHMENT_OBJECT_NAME: number;
-    readonly FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE: number;
-    readonly FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACE: number;
-    readonly FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL: number;
-    readonly FRAMEBUFFER_BINDING: number;
-    readonly FRAMEBUFFER_COMPLETE: number;
-    readonly FRAMEBUFFER_INCOMPLETE_ATTACHMENT: number;
-    readonly FRAMEBUFFER_INCOMPLETE_DIMENSIONS: number;
-    readonly FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT: number;
-    readonly FRAMEBUFFER_UNSUPPORTED: number;
-    readonly FRONT: number;
-    readonly FRONT_AND_BACK: number;
-    readonly FRONT_FACE: number;
-    readonly FUNC_ADD: number;
-    readonly FUNC_REVERSE_SUBTRACT: number;
-    readonly FUNC_SUBTRACT: number;
-    readonly GENERATE_MIPMAP_HINT: number;
-    readonly GEQUAL: number;
-    readonly GREATER: number;
-    readonly GREEN_BITS: number;
-    readonly HIGH_FLOAT: number;
-    readonly HIGH_INT: number;
-    readonly IMPLEMENTATION_COLOR_READ_FORMAT: number;
-    readonly IMPLEMENTATION_COLOR_READ_TYPE: number;
-    readonly INCR: number;
-    readonly INCR_WRAP: number;
-    readonly INT: number;
-    readonly INT_VEC2: number;
-    readonly INT_VEC3: number;
-    readonly INT_VEC4: number;
-    readonly INVALID_ENUM: number;
-    readonly INVALID_FRAMEBUFFER_OPERATION: number;
-    readonly INVALID_OPERATION: number;
-    readonly INVALID_VALUE: number;
-    readonly INVERT: number;
-    readonly KEEP: number;
-    readonly LEQUAL: number;
-    readonly LESS: number;
-    readonly LINEAR: number;
-    readonly LINEAR_MIPMAP_LINEAR: number;
-    readonly LINEAR_MIPMAP_NEAREST: number;
-    readonly LINES: number;
-    readonly LINE_LOOP: number;
-    readonly LINE_STRIP: number;
-    readonly LINE_WIDTH: number;
-    readonly LINK_STATUS: number;
-    readonly LOW_FLOAT: number;
-    readonly LOW_INT: number;
-    readonly LUMINANCE: number;
-    readonly LUMINANCE_ALPHA: number;
-    readonly MAX_COMBINED_TEXTURE_IMAGE_UNITS: number;
-    readonly MAX_CUBE_MAP_TEXTURE_SIZE: number;
-    readonly MAX_FRAGMENT_UNIFORM_VECTORS: number;
-    readonly MAX_RENDERBUFFER_SIZE: number;
-    readonly MAX_TEXTURE_IMAGE_UNITS: number;
-    readonly MAX_TEXTURE_SIZE: number;
-    readonly MAX_VARYING_VECTORS: number;
-    readonly MAX_VERTEX_ATTRIBS: number;
-    readonly MAX_VERTEX_TEXTURE_IMAGE_UNITS: number;
-    readonly MAX_VERTEX_UNIFORM_VECTORS: number;
-    readonly MAX_VIEWPORT_DIMS: number;
-    readonly MEDIUM_FLOAT: number;
-    readonly MEDIUM_INT: number;
-    readonly MIRRORED_REPEAT: number;
-    readonly NEAREST: number;
-    readonly NEAREST_MIPMAP_LINEAR: number;
-    readonly NEAREST_MIPMAP_NEAREST: number;
-    readonly NEVER: number;
-    readonly NICEST: number;
-    readonly NONE: number;
-    readonly NOTEQUAL: number;
-    readonly NO_ERROR: number;
-    readonly ONE: number;
-    readonly ONE_MINUS_CONSTANT_ALPHA: number;
-    readonly ONE_MINUS_CONSTANT_COLOR: number;
-    readonly ONE_MINUS_DST_ALPHA: number;
-    readonly ONE_MINUS_DST_COLOR: number;
-    readonly ONE_MINUS_SRC_ALPHA: number;
-    readonly ONE_MINUS_SRC_COLOR: number;
-    readonly OUT_OF_MEMORY: number;
-    readonly PACK_ALIGNMENT: number;
-    readonly POINTS: number;
-    readonly POLYGON_OFFSET_FACTOR: number;
-    readonly POLYGON_OFFSET_FILL: number;
-    readonly POLYGON_OFFSET_UNITS: number;
-    readonly RED_BITS: number;
-    readonly RENDERBUFFER: number;
-    readonly RENDERBUFFER_ALPHA_SIZE: number;
-    readonly RENDERBUFFER_BINDING: number;
-    readonly RENDERBUFFER_BLUE_SIZE: number;
-    readonly RENDERBUFFER_DEPTH_SIZE: number;
-    readonly RENDERBUFFER_GREEN_SIZE: number;
-    readonly RENDERBUFFER_HEIGHT: number;
-    readonly RENDERBUFFER_INTERNAL_FORMAT: number;
-    readonly RENDERBUFFER_RED_SIZE: number;
-    readonly RENDERBUFFER_STENCIL_SIZE: number;
-    readonly RENDERBUFFER_WIDTH: number;
-    readonly RENDERER: number;
-    readonly REPEAT: number;
-    readonly REPLACE: number;
-    readonly RGB: number;
-    readonly RGB565: number;
-    readonly RGB5_A1: number;
-    readonly RGBA: number;
-    readonly RGBA4: number;
-    readonly SAMPLER_2D: number;
-    readonly SAMPLER_CUBE: number;
-    readonly SAMPLES: number;
-    readonly SAMPLE_ALPHA_TO_COVERAGE: number;
-    readonly SAMPLE_BUFFERS: number;
-    readonly SAMPLE_COVERAGE: number;
-    readonly SAMPLE_COVERAGE_INVERT: number;
-    readonly SAMPLE_COVERAGE_VALUE: number;
-    readonly SCISSOR_BOX: number;
-    readonly SCISSOR_TEST: number;
-    readonly SHADER_TYPE: number;
-    readonly SHADING_LANGUAGE_VERSION: number;
-    readonly SHORT: number;
-    readonly SRC_ALPHA: number;
-    readonly SRC_ALPHA_SATURATE: number;
-    readonly SRC_COLOR: number;
-    readonly STATIC_DRAW: number;
-    readonly STENCIL_ATTACHMENT: number;
-    readonly STENCIL_BACK_FAIL: number;
-    readonly STENCIL_BACK_FUNC: number;
-    readonly STENCIL_BACK_PASS_DEPTH_FAIL: number;
-    readonly STENCIL_BACK_PASS_DEPTH_PASS: number;
-    readonly STENCIL_BACK_REF: number;
-    readonly STENCIL_BACK_VALUE_MASK: number;
-    readonly STENCIL_BACK_WRITEMASK: number;
-    readonly STENCIL_BITS: number;
-    readonly STENCIL_BUFFER_BIT: number;
-    readonly STENCIL_CLEAR_VALUE: number;
-    readonly STENCIL_FAIL: number;
-    readonly STENCIL_FUNC: number;
-    readonly STENCIL_INDEX: number;
-    readonly STENCIL_INDEX8: number;
-    readonly STENCIL_PASS_DEPTH_FAIL: number;
-    readonly STENCIL_PASS_DEPTH_PASS: number;
-    readonly STENCIL_REF: number;
-    readonly STENCIL_TEST: number;
-    readonly STENCIL_VALUE_MASK: number;
-    readonly STENCIL_WRITEMASK: number;
-    readonly STREAM_DRAW: number;
-    readonly SUBPIXEL_BITS: number;
-    readonly TEXTURE: number;
-    readonly TEXTURE0: number;
-    readonly TEXTURE1: number;
-    readonly TEXTURE10: number;
-    readonly TEXTURE11: number;
-    readonly TEXTURE12: number;
-    readonly TEXTURE13: number;
-    readonly TEXTURE14: number;
-    readonly TEXTURE15: number;
-    readonly TEXTURE16: number;
-    readonly TEXTURE17: number;
-    readonly TEXTURE18: number;
-    readonly TEXTURE19: number;
-    readonly TEXTURE2: number;
-    readonly TEXTURE20: number;
-    readonly TEXTURE21: number;
-    readonly TEXTURE22: number;
-    readonly TEXTURE23: number;
-    readonly TEXTURE24: number;
-    readonly TEXTURE25: number;
-    readonly TEXTURE26: number;
-    readonly TEXTURE27: number;
-    readonly TEXTURE28: number;
-    readonly TEXTURE29: number;
-    readonly TEXTURE3: number;
-    readonly TEXTURE30: number;
-    readonly TEXTURE31: number;
-    readonly TEXTURE4: number;
-    readonly TEXTURE5: number;
-    readonly TEXTURE6: number;
-    readonly TEXTURE7: number;
-    readonly TEXTURE8: number;
-    readonly TEXTURE9: number;
-    readonly TEXTURE_2D: number;
-    readonly TEXTURE_BINDING_2D: number;
-    readonly TEXTURE_BINDING_CUBE_MAP: number;
-    readonly TEXTURE_CUBE_MAP: number;
-    readonly TEXTURE_CUBE_MAP_NEGATIVE_X: number;
-    readonly TEXTURE_CUBE_MAP_NEGATIVE_Y: number;
-    readonly TEXTURE_CUBE_MAP_NEGATIVE_Z: number;
-    readonly TEXTURE_CUBE_MAP_POSITIVE_X: number;
-    readonly TEXTURE_CUBE_MAP_POSITIVE_Y: number;
-    readonly TEXTURE_CUBE_MAP_POSITIVE_Z: number;
-    readonly TEXTURE_MAG_FILTER: number;
-    readonly TEXTURE_MIN_FILTER: number;
-    readonly TEXTURE_WRAP_S: number;
-    readonly TEXTURE_WRAP_T: number;
-    readonly TRIANGLES: number;
-    readonly TRIANGLE_FAN: number;
-    readonly TRIANGLE_STRIP: number;
-    readonly UNPACK_ALIGNMENT: number;
-    readonly UNPACK_COLORSPACE_CONVERSION_WEBGL: number;
-    readonly UNPACK_FLIP_Y_WEBGL: number;
-    readonly UNPACK_PREMULTIPLY_ALPHA_WEBGL: number;
-    readonly UNSIGNED_BYTE: number;
-    readonly UNSIGNED_INT: number;
-    readonly UNSIGNED_SHORT: number;
-    readonly UNSIGNED_SHORT_4_4_4_4: number;
-    readonly UNSIGNED_SHORT_5_5_5_1: number;
-    readonly UNSIGNED_SHORT_5_6_5: number;
-    readonly VALIDATE_STATUS: number;
-    readonly VENDOR: number;
-    readonly VERSION: number;
-    readonly VERTEX_ATTRIB_ARRAY_BUFFER_BINDING: number;
-    readonly VERTEX_ATTRIB_ARRAY_ENABLED: number;
-    readonly VERTEX_ATTRIB_ARRAY_NORMALIZED: number;
-    readonly VERTEX_ATTRIB_ARRAY_POINTER: number;
-    readonly VERTEX_ATTRIB_ARRAY_SIZE: number;
-    readonly VERTEX_ATTRIB_ARRAY_STRIDE: number;
-    readonly VERTEX_ATTRIB_ARRAY_TYPE: number;
-    readonly VERTEX_SHADER: number;
-    readonly VIEWPORT: number;
-    readonly ZERO: number;
-};
-
-interface WebGLShader extends WebGLObject {
-}
-
-declare var WebGLShader: {
-    prototype: WebGLShader;
-    new(): WebGLShader;
-};
-
-interface WebGLShaderPrecisionFormat {
-    readonly precision: number;
-    readonly rangeMax: number;
-    readonly rangeMin: number;
-}
-
-declare var WebGLShaderPrecisionFormat: {
-    prototype: WebGLShaderPrecisionFormat;
-    new(): WebGLShaderPrecisionFormat;
-};
-
-interface WebGLTexture extends WebGLObject {
-}
-
-declare var WebGLTexture: {
-    prototype: WebGLTexture;
-    new(): WebGLTexture;
-};
-
-interface WebGLUniformLocation {
-}
-
-declare var WebGLUniformLocation: {
-    prototype: WebGLUniformLocation;
-    new(): WebGLUniformLocation;
-};
-
-interface WebGLVertexArrayObjectOES {
-}
-
-interface WebKitCSSMatrix {
-    a: number;
-    b: number;
-    c: number;
-    d: number;
-    e: number;
-    f: number;
-    m11: number;
-    m12: number;
-    m13: number;
-    m14: number;
-    m21: number;
-    m22: number;
-    m23: number;
-    m24: number;
-    m31: number;
-    m32: number;
-    m33: number;
-    m34: number;
-    m41: number;
-    m42: number;
-    m43: number;
-    m44: number;
-    inverse(): WebKitCSSMatrix;
-    multiply(secondMatrix: WebKitCSSMatrix): WebKitCSSMatrix;
-    rotate(angleX: number, angleY?: number, angleZ?: number): WebKitCSSMatrix;
-    rotateAxisAngle(x: number, y: number, z: number, angle: number): WebKitCSSMatrix;
-    scale(scaleX: number, scaleY?: number, scaleZ?: number): WebKitCSSMatrix;
-    setMatrixValue(value: string): void;
-    skewX(angle: number): WebKitCSSMatrix;
-    skewY(angle: number): WebKitCSSMatrix;
-    toString(): string;
-    translate(x: number, y: number, z?: number): WebKitCSSMatrix;
-}
-
-declare var WebKitCSSMatrix: {
-    prototype: WebKitCSSMatrix;
-    new(text?: string): WebKitCSSMatrix;
-};
-
-interface WebKitDirectoryEntry extends WebKitEntry {
-    createReader(): WebKitDirectoryReader;
-}
-
-declare var WebKitDirectoryEntry: {
-    prototype: WebKitDirectoryEntry;
-    new(): WebKitDirectoryEntry;
-};
-
-interface WebKitDirectoryReader {
-    readEntries(successCallback: WebKitEntriesCallback, errorCallback?: WebKitErrorCallback): void;
-}
-
-declare var WebKitDirectoryReader: {
-    prototype: WebKitDirectoryReader;
-    new(): WebKitDirectoryReader;
-};
-
-interface WebKitEntry {
-    readonly filesystem: WebKitFileSystem;
-    readonly fullPath: string;
-    readonly isDirectory: boolean;
-    readonly isFile: boolean;
-    readonly name: string;
-}
-
-declare var WebKitEntry: {
-    prototype: WebKitEntry;
-    new(): WebKitEntry;
-};
-
-interface WebKitFileEntry extends WebKitEntry {
-    file(successCallback: WebKitFileCallback, errorCallback?: WebKitErrorCallback): void;
-}
-
-declare var WebKitFileEntry: {
-    prototype: WebKitFileEntry;
-    new(): WebKitFileEntry;
-};
-
-interface WebKitFileSystem {
-    readonly name: string;
-    readonly root: WebKitDirectoryEntry;
-}
-
-declare var WebKitFileSystem: {
-    prototype: WebKitFileSystem;
-    new(): WebKitFileSystem;
-};
-
-interface WebKitPoint {
-    x: number;
-    y: number;
-}
-
-declare var WebKitPoint: {
-    prototype: WebKitPoint;
-    new(x?: number, y?: number): WebKitPoint;
-};
-
-interface WebSocketEventMap {
-    "close": CloseEvent;
-    "error": Event;
-    "message": MessageEvent;
-    "open": Event;
-}
-
-interface WebSocket extends EventTarget {
-    binaryType: BinaryType;
-    readonly bufferedAmount: number;
-    readonly extensions: string;
-    onclose: ((this: WebSocket, ev: CloseEvent) => any) | null;
-    onerror: ((this: WebSocket, ev: Event) => any) | null;
-    onmessage: ((this: WebSocket, ev: MessageEvent) => any) | null;
-    onopen: ((this: WebSocket, ev: Event) => any) | null;
-    readonly protocol: string;
-    readonly readyState: number;
-    readonly url: string;
-    close(code?: number, reason?: string): void;
-    send(data: string | ArrayBufferLike | Blob | ArrayBufferView): void;
-    readonly CLOSED: number;
-    readonly CLOSING: number;
-    readonly CONNECTING: number;
-    readonly OPEN: number;
-    addEventListener<K extends keyof WebSocketEventMap>(type: K, listener: (this: WebSocket, ev: WebSocketEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof WebSocketEventMap>(type: K, listener: (this: WebSocket, ev: WebSocketEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var WebSocket: {
-    prototype: WebSocket;
-    new(url: string, protocols?: string | string[]): WebSocket;
-    readonly CLOSED: number;
-    readonly CLOSING: number;
-    readonly CONNECTING: number;
-    readonly OPEN: number;
-};
-
-interface WheelEvent extends MouseEvent {
-    readonly deltaMode: number;
-    readonly deltaX: number;
-    readonly deltaY: number;
-    readonly deltaZ: number;
-    readonly wheelDelta: number;
-    readonly wheelDeltaX: number;
-    readonly wheelDeltaY: number;
-    getCurrentPoint(element: Element): void;
-    initWheelEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number, screenXArg: number, screenYArg: number, clientXArg: number, clientYArg: number, buttonArg: number, relatedTargetArg: EventTarget, modifiersListArg: string, deltaXArg: number, deltaYArg: number, deltaZArg: number, deltaMode: number): void;
-    readonly DOM_DELTA_LINE: number;
-    readonly DOM_DELTA_PAGE: number;
-    readonly DOM_DELTA_PIXEL: number;
-}
-
-declare var WheelEvent: {
-    prototype: WheelEvent;
-    new(typeArg: string, eventInitDict?: WheelEventInit): WheelEvent;
-    readonly DOM_DELTA_LINE: number;
-    readonly DOM_DELTA_PAGE: number;
-    readonly DOM_DELTA_PIXEL: number;
-};
-
-interface WindowEventMap extends GlobalEventHandlersEventMap {
-    "abort": UIEvent;
-    "afterprint": Event;
-    "beforeprint": Event;
-    "beforeunload": BeforeUnloadEvent;
-    "blur": FocusEvent;
-    "canplay": Event;
-    "canplaythrough": Event;
-    "change": Event;
-    "click": MouseEvent;
-    "compassneedscalibration": Event;
-    "contextmenu": PointerEvent;
-    "dblclick": MouseEvent;
-    "devicelight": DeviceLightEvent;
-    "devicemotion": DeviceMotionEvent;
-    "deviceorientation": DeviceOrientationEvent;
-    "drag": DragEvent;
-    "dragend": DragEvent;
-    "dragenter": DragEvent;
-    "dragleave": DragEvent;
-    "dragover": DragEvent;
-    "dragstart": DragEvent;
-    "drop": DragEvent;
-    "durationchange": Event;
-    "emptied": Event;
-    "ended": Event;
-    "error": ErrorEvent;
-    "focus": FocusEvent;
-    "hashchange": HashChangeEvent;
-    "input": Event;
-    "invalid": Event;
-    "keydown": KeyboardEvent;
-    "keypress": KeyboardEvent;
-    "keyup": KeyboardEvent;
-    "load": Event;
-    "loadeddata": Event;
-    "loadedmetadata": Event;
-    "loadstart": Event;
-    "message": MessageEvent;
-    "mousedown": MouseEvent;
-    "mouseenter": MouseEvent;
-    "mouseleave": MouseEvent;
-    "mousemove": MouseEvent;
-    "mouseout": MouseEvent;
-    "mouseover": MouseEvent;
-    "mouseup": MouseEvent;
-    "mousewheel": WheelEvent;
-    "MSGestureChange": Event;
-    "MSGestureDoubleTap": Event;
-    "MSGestureEnd": Event;
-    "MSGestureHold": Event;
-    "MSGestureStart": Event;
-    "MSGestureTap": Event;
-    "MSInertiaStart": Event;
-    "MSPointerCancel": Event;
-    "MSPointerDown": Event;
-    "MSPointerEnter": Event;
-    "MSPointerLeave": Event;
-    "MSPointerMove": Event;
-    "MSPointerOut": Event;
-    "MSPointerOver": Event;
-    "MSPointerUp": Event;
-    "offline": Event;
-    "online": Event;
-    "orientationchange": Event;
-    "pagehide": PageTransitionEvent;
-    "pageshow": PageTransitionEvent;
-    "pause": Event;
-    "play": Event;
-    "playing": Event;
-    "popstate": PopStateEvent;
-    "progress": ProgressEvent;
-    "ratechange": Event;
-    "readystatechange": ProgressEvent;
-    "reset": Event;
-    "resize": UIEvent;
-    "scroll": UIEvent;
-    "seeked": Event;
-    "seeking": Event;
-    "select": UIEvent;
-    "stalled": Event;
-    "storage": StorageEvent;
-    "submit": Event;
-    "suspend": Event;
-    "timeupdate": Event;
-    "touchcancel": TouchEvent;
-    "touchend": TouchEvent;
-    "touchmove": TouchEvent;
-    "touchstart": TouchEvent;
-    "unload": Event;
-    "volumechange": Event;
-    "vrdisplayactivate": Event;
-    "vrdisplayblur": Event;
-    "vrdisplayconnect": Event;
-    "vrdisplaydeactivate": Event;
-    "vrdisplaydisconnect": Event;
-    "vrdisplayfocus": Event;
-    "vrdisplaypointerrestricted": Event;
-    "vrdisplaypointerunrestricted": Event;
-    "vrdisplaypresentchange": Event;
-    "waiting": Event;
-}
-
-interface Window extends EventTarget, WindowTimers, WindowSessionStorage, WindowLocalStorage, WindowConsole, GlobalEventHandlers, IDBEnvironment, WindowBase64, GlobalFetch {
-    Blob: typeof Blob;
-    URL: typeof URL;
-    URLSearchParams: typeof URLSearchParams;
-    readonly applicationCache: ApplicationCache;
-    readonly caches: CacheStorage;
-    readonly clientInformation: Navigator;
-    readonly closed: boolean;
-    readonly crypto: Crypto;
-    customElements: CustomElementRegistry;
-    defaultStatus: string;
-    readonly devicePixelRatio: number;
-    readonly doNotTrack: string;
-    readonly document: Document;
-    event: Event | undefined;
-    readonly external: External;
-    readonly frameElement: Element;
-    readonly frames: Window;
-    readonly history: History;
-    readonly innerHeight: number;
-    readonly innerWidth: number;
-    readonly isSecureContext: boolean;
-    readonly length: number;
-    location: Location;
-    readonly locationbar: BarProp;
-    readonly menubar: BarProp;
-    readonly msContentScript: ExtensionScriptApis;
-    readonly msCredentials: MSCredentials;
-    name: string;
-    readonly navigator: Navigator;
-    offscreenBuffering: string | boolean;
-    onabort: ((this: Window, ev: UIEvent) => any) | null;
-    onafterprint: ((this: Window, ev: Event) => any) | null;
-    onbeforeprint: ((this: Window, ev: Event) => any) | null;
-    onbeforeunload: ((this: Window, ev: BeforeUnloadEvent) => any) | null;
-    onblur: ((this: Window, ev: FocusEvent) => any) | null;
-    oncanplay: ((this: Window, ev: Event) => any) | null;
-    oncanplaythrough: ((this: Window, ev: Event) => any) | null;
-    onchange: ((this: Window, ev: Event) => any) | null;
-    onclick: ((this: Window, ev: MouseEvent) => any) | null;
-    oncompassneedscalibration: ((this: Window, ev: Event) => any) | null;
-    oncontextmenu: ((this: Window, ev: PointerEvent) => any) | null;
-    ondblclick: ((this: Window, ev: MouseEvent) => any) | null;
-    ondevicelight: ((this: Window, ev: DeviceLightEvent) => any) | null;
-    ondevicemotion: ((this: Window, ev: DeviceMotionEvent) => any) | null;
-    ondeviceorientation: ((this: Window, ev: DeviceOrientationEvent) => any) | null;
-    ondrag: ((this: Window, ev: DragEvent) => any) | null;
-    ondragend: ((this: Window, ev: DragEvent) => any) | null;
-    ondragenter: ((this: Window, ev: DragEvent) => any) | null;
-    ondragleave: ((this: Window, ev: DragEvent) => any) | null;
-    ondragover: ((this: Window, ev: DragEvent) => any) | null;
-    ondragstart: ((this: Window, ev: DragEvent) => any) | null;
-    ondrop: ((this: Window, ev: DragEvent) => any) | null;
-    ondurationchange: ((this: Window, ev: Event) => any) | null;
-    onemptied: ((this: Window, ev: Event) => any) | null;
-    onended: ((this: Window, ev: Event) => any) | null;
-    onerror: ErrorEventHandler;
-    onfocus: ((this: Window, ev: FocusEvent) => any) | null;
-    onhashchange: ((this: Window, ev: HashChangeEvent) => any) | null;
-    oninput: ((this: Window, ev: Event) => any) | null;
-    oninvalid: ((this: Window, ev: Event) => any) | null;
-    onkeydown: ((this: Window, ev: KeyboardEvent) => any) | null;
-    onkeypress: ((this: Window, ev: KeyboardEvent) => any) | null;
-    onkeyup: ((this: Window, ev: KeyboardEvent) => any) | null;
-    onload: ((this: Window, ev: Event) => any) | null;
-    onloadeddata: ((this: Window, ev: Event) => any) | null;
-    onloadedmetadata: ((this: Window, ev: Event) => any) | null;
-    onloadstart: ((this: Window, ev: Event) => any) | null;
-    onmessage: ((this: Window, ev: MessageEvent) => any) | null;
-    onmousedown: ((this: Window, ev: MouseEvent) => any) | null;
-    onmouseenter: ((this: Window, ev: MouseEvent) => any) | null;
-    onmouseleave: ((this: Window, ev: MouseEvent) => any) | null;
-    onmousemove: ((this: Window, ev: MouseEvent) => any) | null;
-    onmouseout: ((this: Window, ev: MouseEvent) => any) | null;
-    onmouseover: ((this: Window, ev: MouseEvent) => any) | null;
-    onmouseup: ((this: Window, ev: MouseEvent) => any) | null;
-    onmousewheel: ((this: Window, ev: WheelEvent) => any) | null;
-    onmsgesturechange: ((this: Window, ev: Event) => any) | null;
-    onmsgesturedoubletap: ((this: Window, ev: Event) => any) | null;
-    onmsgestureend: ((this: Window, ev: Event) => any) | null;
-    onmsgesturehold: ((this: Window, ev: Event) => any) | null;
-    onmsgesturestart: ((this: Window, ev: Event) => any) | null;
-    onmsgesturetap: ((this: Window, ev: Event) => any) | null;
-    onmsinertiastart: ((this: Window, ev: Event) => any) | null;
-    onmspointercancel: ((this: Window, ev: Event) => any) | null;
-    onmspointerdown: ((this: Window, ev: Event) => any) | null;
-    onmspointerenter: ((this: Window, ev: Event) => any) | null;
-    onmspointerleave: ((this: Window, ev: Event) => any) | null;
-    onmspointermove: ((this: Window, ev: Event) => any) | null;
-    onmspointerout: ((this: Window, ev: Event) => any) | null;
-    onmspointerover: ((this: Window, ev: Event) => any) | null;
-    onmspointerup: ((this: Window, ev: Event) => any) | null;
-    onoffline: ((this: Window, ev: Event) => any) | null;
-    ononline: ((this: Window, ev: Event) => any) | null;
-    onorientationchange: ((this: Window, ev: Event) => any) | null;
-    onpagehide: ((this: Window, ev: PageTransitionEvent) => any) | null;
-    onpageshow: ((this: Window, ev: PageTransitionEvent) => any) | null;
-    onpause: ((this: Window, ev: Event) => any) | null;
-    onplay: ((this: Window, ev: Event) => any) | null;
-    onplaying: ((this: Window, ev: Event) => any) | null;
-    onpopstate: ((this: Window, ev: PopStateEvent) => any) | null;
-    onprogress: ((this: Window, ev: ProgressEvent) => any) | null;
-    onratechange: ((this: Window, ev: Event) => any) | null;
-    onreadystatechange: ((this: Window, ev: ProgressEvent) => any) | null;
-    onreset: ((this: Window, ev: Event) => any) | null;
-    onresize: ((this: Window, ev: UIEvent) => any) | null;
-    onscroll: ((this: Window, ev: UIEvent) => any) | null;
-    onseeked: ((this: Window, ev: Event) => any) | null;
-    onseeking: ((this: Window, ev: Event) => any) | null;
-    onselect: ((this: Window, ev: UIEvent) => any) | null;
-    onstalled: ((this: Window, ev: Event) => any) | null;
-    onstorage: ((this: Window, ev: StorageEvent) => any) | null;
-    onsubmit: ((this: Window, ev: Event) => any) | null;
-    onsuspend: ((this: Window, ev: Event) => any) | null;
-    ontimeupdate: ((this: Window, ev: Event) => any) | null;
-    ontouchcancel: (ev: TouchEvent) => any;
-    ontouchend: (ev: TouchEvent) => any;
-    ontouchmove: (ev: TouchEvent) => any;
-    ontouchstart: (ev: TouchEvent) => any;
-    onunload: ((this: Window, ev: Event) => any) | null;
-    onvolumechange: ((this: Window, ev: Event) => any) | null;
-    onvrdisplayactivate: ((this: Window, ev: Event) => any) | null;
-    onvrdisplayblur: ((this: Window, ev: Event) => any) | null;
-    onvrdisplayconnect: ((this: Window, ev: Event) => any) | null;
-    onvrdisplaydeactivate: ((this: Window, ev: Event) => any) | null;
-    onvrdisplaydisconnect: ((this: Window, ev: Event) => any) | null;
-    onvrdisplayfocus: ((this: Window, ev: Event) => any) | null;
-    onvrdisplaypointerrestricted: ((this: Window, ev: Event) => any) | null;
-    onvrdisplaypointerunrestricted: ((this: Window, ev: Event) => any) | null;
-    onvrdisplaypresentchange: ((this: Window, ev: Event) => any) | null;
-    onwaiting: ((this: Window, ev: Event) => any) | null;
-    opener: any;
-    readonly orientation: string | number;
-    readonly outerHeight: number;
-    readonly outerWidth: number;
-    readonly pageXOffset: number;
-    readonly pageYOffset: number;
-    readonly parent: Window;
-    readonly performance: Performance;
-    readonly personalbar: BarProp;
-    readonly screen: Screen;
-    readonly screenLeft: number;
-    readonly screenTop: number;
-    readonly screenX: number;
-    readonly screenY: number;
-    readonly scrollX: number;
-    readonly scrollY: number;
-    readonly scrollbars: BarProp;
-    readonly self: Window;
-    readonly speechSynthesis: SpeechSynthesis;
-    status: string;
-    readonly statusbar: BarProp;
-    readonly styleMedia: StyleMedia;
-    readonly toolbar: BarProp;
-    readonly top: Window;
-    readonly window: Window;
-    alert(message?: any): void;
-    blur(): void;
-    cancelAnimationFrame(handle: number): void;
-    captureEvents(): void;
-    close(): void;
-    confirm(message?: string): boolean;
-    createImageBitmap(image: HTMLImageElement | SVGImageElement | HTMLVideoElement | HTMLCanvasElement | ImageBitmap | ImageData | Blob, options?: ImageBitmapOptions): Promise<ImageBitmap>;
-    createImageBitmap(image: HTMLImageElement | SVGImageElement | HTMLVideoElement | HTMLCanvasElement | ImageBitmap | ImageData | Blob, sx: number, sy: number, sw: number, sh: number, options?: ImageBitmapOptions): Promise<ImageBitmap>;
-    departFocus(navigationReason: NavigationReason, origin: FocusNavigationOrigin): void;
-    focus(): void;
-    getComputedStyle(elt: Element, pseudoElt?: string | null): CSSStyleDeclaration;
-    getMatchedCSSRules(elt: Element, pseudoElt?: string | null): CSSRuleList;
-    getSelection(): Selection;
-    matchMedia(mediaQuery: string): MediaQueryList;
-    moveBy(x?: number, y?: number): void;
-    moveTo(x?: number, y?: number): void;
-    msWriteProfilerMark(profilerMarkName: string): void;
-    open(url?: string, target?: string, features?: string, replace?: boolean): Window | null;
-    postMessage(message: any, targetOrigin: string, transfer?: any[]): void;
-    print(): void;
-    prompt(message?: string, _default?: string): string | null;
-    releaseEvents(): void;
-    requestAnimationFrame(callback: FrameRequestCallback): number;
-    resizeBy(x?: number, y?: number): void;
-    resizeTo(x?: number, y?: number): void;
-    scroll(options?: ScrollToOptions): void;
-    scroll(x?: number, y?: number): void;
-    scrollBy(options?: ScrollToOptions): void;
-    scrollBy(x?: number, y?: number): void;
-    scrollTo(options?: ScrollToOptions): void;
-    scrollTo(x?: number, y?: number): void;
-    stop(): void;
-    webkitCancelAnimationFrame(handle: number): void;
-    webkitConvertPointFromNodeToPage(node: Node, pt: WebKitPoint): WebKitPoint;
-    webkitConvertPointFromPageToNode(node: Node, pt: WebKitPoint): WebKitPoint;
-    webkitRequestAnimationFrame(callback: FrameRequestCallback): number;
-    addEventListener<K extends keyof WindowEventMap>(type: K, listener: (this: Window, ev: WindowEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof WindowEventMap>(type: K, listener: (this: Window, ev: WindowEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var Window: {
-    prototype: Window;
-    new(): Window;
-};
-
-interface WindowBase64 {
-    atob(encodedString: string): string;
-    btoa(rawString: string): string;
-}
-
-interface WindowConsole {
-    readonly console: Console;
-}
-
-interface WindowEventHandlersEventMap {
-    "afterprint": Event;
-    "beforeprint": Event;
-    "beforeunload": BeforeUnloadEvent;
-    "hashchange": HashChangeEvent;
-    "message": MessageEvent;
-    "offline": Event;
-    "online": Event;
-    "pagehide": PageTransitionEvent;
-    "pageshow": PageTransitionEvent;
-    "popstate": PopStateEvent;
-    "storage": StorageEvent;
-    "unload": Event;
-}
-
-interface WindowEventHandlers {
-    onafterprint: ((this: WindowEventHandlers, ev: Event) => any) | null;
-    onbeforeprint: ((this: WindowEventHandlers, ev: Event) => any) | null;
-    onbeforeunload: ((this: WindowEventHandlers, ev: BeforeUnloadEvent) => any) | null;
-    onhashchange: ((this: WindowEventHandlers, ev: HashChangeEvent) => any) | null;
-    onmessage: ((this: WindowEventHandlers, ev: MessageEvent) => any) | null;
-    onoffline: ((this: WindowEventHandlers, ev: Event) => any) | null;
-    ononline: ((this: WindowEventHandlers, ev: Event) => any) | null;
-    onpagehide: ((this: WindowEventHandlers, ev: PageTransitionEvent) => any) | null;
-    onpageshow: ((this: WindowEventHandlers, ev: PageTransitionEvent) => any) | null;
-    onpopstate: ((this: WindowEventHandlers, ev: PopStateEvent) => any) | null;
-    onstorage: ((this: WindowEventHandlers, ev: StorageEvent) => any) | null;
-    onunload: ((this: WindowEventHandlers, ev: Event) => any) | null;
-    addEventListener<K extends keyof WindowEventHandlersEventMap>(type: K, listener: (this: WindowEventHandlers, ev: WindowEventHandlersEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof WindowEventHandlersEventMap>(type: K, listener: (this: WindowEventHandlers, ev: WindowEventHandlersEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-interface WindowLocalStorage {
-    readonly localStorage: Storage;
-}
-
-interface WindowSessionStorage {
-    readonly sessionStorage: Storage;
-}
-
-interface WindowTimers extends WindowTimersExtension {
-    clearInterval(handle?: number): void;
-    clearTimeout(handle?: number): void;
-    setInterval(handler: (...args: any[]) => void, timeout: number): number;
-    setInterval(handler: any, timeout?: any, ...args: any[]): number;
-    setTimeout(handler: (...args: any[]) => void, timeout: number): number;
-    setTimeout(handler: any, timeout?: any, ...args: any[]): number;
-}
-
-interface WindowTimersExtension {
-    clearImmediate(handle: number): void;
-    setImmediate(handler: (...args: any[]) => void): number;
-    setImmediate(handler: any, ...args: any[]): number;
-}
-
-interface WorkerEventMap extends AbstractWorkerEventMap {
-    "message": MessageEvent;
-}
-
-interface Worker extends EventTarget, AbstractWorker {
-    onmessage: ((this: Worker, ev: MessageEvent) => any) | null;
-    /** @deprecated */
-    postMessage(message: any, transfer?: any[]): void;
-    terminate(): void;
-    addEventListener<K extends keyof WorkerEventMap>(type: K, listener: (this: Worker, ev: WorkerEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof WorkerEventMap>(type: K, listener: (this: Worker, ev: WorkerEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var Worker: {
-    prototype: Worker;
-    new(stringUrl: string): Worker;
-};
-
-interface WritableStream {
-    readonly locked: boolean;
-    abort(reason?: any): Promise<void>;
-    getWriter(): WritableStreamDefaultWriter;
-}
-
-declare var WritableStream: {
-    prototype: WritableStream;
-    new(underlyingSink?: UnderlyingSink, strategy?: QueuingStrategy): WritableStream;
-};
-
-interface WritableStreamDefaultController {
-    error(error?: any): void;
-}
-
-declare var WritableStreamDefaultController: {
-    prototype: WritableStreamDefaultController;
-    new(): WritableStreamDefaultController;
-};
-
-interface WritableStreamDefaultWriter {
-    readonly closed: Promise<void>;
-    readonly desiredSize: number;
-    readonly ready: Promise<void>;
-    abort(reason?: any): Promise<void>;
-    close(): Promise<void>;
-    releaseLock(): void;
-    write(chunk?: any): Promise<any>;
-}
-
-declare var WritableStreamDefaultWriter: {
-    prototype: WritableStreamDefaultWriter;
-    new(): WritableStreamDefaultWriter;
-};
-
-interface XMLDocument extends Document {
-    addEventListener<K extends keyof DocumentEventMap>(type: K, listener: (this: XMLDocument, ev: DocumentEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof DocumentEventMap>(type: K, listener: (this: XMLDocument, ev: DocumentEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var XMLDocument: {
-    prototype: XMLDocument;
-    new(): XMLDocument;
-};
-
-interface XMLHttpRequestEventMap extends XMLHttpRequestEventTargetEventMap {
-    "readystatechange": Event;
-}
-
-interface XMLHttpRequest extends EventTarget, XMLHttpRequestEventTarget {
-    msCaching: string;
-    onreadystatechange: ((this: XMLHttpRequest, ev: Event) => any) | null;
-    readonly readyState: number;
-    readonly response: any;
-    readonly responseText: string;
-    responseType: XMLHttpRequestResponseType;
-    readonly responseURL: string;
-    readonly responseXML: Document | null;
-    readonly status: number;
-    readonly statusText: string;
-    timeout: number;
-    readonly upload: XMLHttpRequestUpload;
-    withCredentials: boolean;
-    abort(): void;
-    getAllResponseHeaders(): string;
-    getResponseHeader(header: string): string | null;
-    msCachingEnabled(): boolean;
-    open(method: string, url: string, async?: boolean, user?: string | null, password?: string | null): void;
-    overrideMimeType(mime: string): void;
-    send(data?: any): void;
-    setRequestHeader(header: string, value: string): void;
-    readonly DONE: number;
-    readonly HEADERS_RECEIVED: number;
-    readonly LOADING: number;
-    readonly OPENED: number;
-    readonly UNSENT: number;
-    addEventListener<K extends keyof XMLHttpRequestEventMap>(type: K, listener: (this: XMLHttpRequest, ev: XMLHttpRequestEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof XMLHttpRequestEventMap>(type: K, listener: (this: XMLHttpRequest, ev: XMLHttpRequestEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var XMLHttpRequest: {
-    prototype: XMLHttpRequest;
-    new(): XMLHttpRequest;
-    readonly DONE: number;
-    readonly HEADERS_RECEIVED: number;
-    readonly LOADING: number;
-    readonly OPENED: number;
-    readonly UNSENT: number;
-};
-
-interface XMLHttpRequestEventTargetEventMap {
-    "abort": Event;
-    "error": ErrorEvent;
-    "load": Event;
-    "loadend": ProgressEvent;
-    "loadstart": Event;
-    "progress": ProgressEvent;
-    "timeout": ProgressEvent;
-}
-
-interface XMLHttpRequestEventTarget {
-    onabort: ((this: XMLHttpRequest, ev: Event) => any) | null;
-    onerror: ((this: XMLHttpRequest, ev: ErrorEvent) => any) | null;
-    onload: ((this: XMLHttpRequest, ev: Event) => any) | null;
-    onloadend: ((this: XMLHttpRequest, ev: ProgressEvent) => any) | null;
-    onloadstart: ((this: XMLHttpRequest, ev: Event) => any) | null;
-    onprogress: ((this: XMLHttpRequest, ev: ProgressEvent) => any) | null;
-    ontimeout: ((this: XMLHttpRequest, ev: ProgressEvent) => any) | null;
-    addEventListener<K extends keyof XMLHttpRequestEventTargetEventMap>(type: K, listener: (this: XMLHttpRequestEventTarget, ev: XMLHttpRequestEventTargetEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof XMLHttpRequestEventTargetEventMap>(type: K, listener: (this: XMLHttpRequestEventTarget, ev: XMLHttpRequestEventTargetEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-interface XMLHttpRequestUpload extends EventTarget, XMLHttpRequestEventTarget {
-    addEventListener<K extends keyof XMLHttpRequestEventTargetEventMap>(type: K, listener: (this: XMLHttpRequestUpload, ev: XMLHttpRequestEventTargetEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof XMLHttpRequestEventTargetEventMap>(type: K, listener: (this: XMLHttpRequestUpload, ev: XMLHttpRequestEventTargetEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var XMLHttpRequestUpload: {
-    prototype: XMLHttpRequestUpload;
-    new(): XMLHttpRequestUpload;
-};
-
-interface XMLSerializer {
-    serializeToString(target: Node): string;
-}
-
-declare var XMLSerializer: {
-    prototype: XMLSerializer;
-    new(): XMLSerializer;
-};
-
-interface XPathEvaluator {
-    createExpression(expression: string, resolver: XPathNSResolver): XPathExpression;
-    createNSResolver(nodeResolver?: Node): XPathNSResolver;
-    evaluate(expression: string, contextNode: Node, resolver: XPathNSResolver | null, type: number, result: XPathResult | null): XPathResult;
-}
-
-declare var XPathEvaluator: {
-    prototype: XPathEvaluator;
-    new(): XPathEvaluator;
-};
-
-interface XPathExpression {
-    evaluate(contextNode: Node, type: number, result: XPathResult | null): XPathResult;
-}
-
-declare var XPathExpression: {
-    prototype: XPathExpression;
-    new(): XPathExpression;
-};
-
-interface XPathNSResolver {
-    lookupNamespaceURI(prefix: string): string;
-}
-
-declare var XPathNSResolver: {
-    prototype: XPathNSResolver;
-    new(): XPathNSResolver;
-};
-
-interface XPathResult {
-    readonly booleanValue: boolean;
-    readonly invalidIteratorState: boolean;
-    readonly numberValue: number;
-    readonly resultType: number;
-    readonly singleNodeValue: Node;
-    readonly snapshotLength: number;
-    readonly stringValue: string;
-    iterateNext(): Node;
-    snapshotItem(index: number): Node;
-    readonly ANY_TYPE: number;
-    readonly ANY_UNORDERED_NODE_TYPE: number;
-    readonly BOOLEAN_TYPE: number;
-    readonly FIRST_ORDERED_NODE_TYPE: number;
-    readonly NUMBER_TYPE: number;
-    readonly ORDERED_NODE_ITERATOR_TYPE: number;
-    readonly ORDERED_NODE_SNAPSHOT_TYPE: number;
-    readonly STRING_TYPE: number;
-    readonly UNORDERED_NODE_ITERATOR_TYPE: number;
-    readonly UNORDERED_NODE_SNAPSHOT_TYPE: number;
-}
-
-declare var XPathResult: {
-    prototype: XPathResult;
-    new(): XPathResult;
-    readonly ANY_TYPE: number;
-    readonly ANY_UNORDERED_NODE_TYPE: number;
-    readonly BOOLEAN_TYPE: number;
-    readonly FIRST_ORDERED_NODE_TYPE: number;
-    readonly NUMBER_TYPE: number;
-    readonly ORDERED_NODE_ITERATOR_TYPE: number;
-    readonly ORDERED_NODE_SNAPSHOT_TYPE: number;
-    readonly STRING_TYPE: number;
-    readonly UNORDERED_NODE_ITERATOR_TYPE: number;
-    readonly UNORDERED_NODE_SNAPSHOT_TYPE: number;
-};
-
-interface XSLTProcessor {
-    clearParameters(): void;
-    getParameter(namespaceURI: string, localName: string): any;
-    importStylesheet(style: Node): void;
-    removeParameter(namespaceURI: string, localName: string): void;
-    reset(): void;
-    setParameter(namespaceURI: string, localName: string, value: any): void;
-    transformToDocument(source: Node): Document;
-    transformToFragment(source: Node, document: Document): DocumentFragment;
-}
-
-declare var XSLTProcessor: {
-    prototype: XSLTProcessor;
-    new(): XSLTProcessor;
-};
-
-interface webkitRTCPeerConnection extends RTCPeerConnection {
-    addEventListener<K extends keyof RTCPeerConnectionEventMap>(type: K, listener: (this: webkitRTCPeerConnection, ev: RTCPeerConnectionEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCPeerConnectionEventMap>(type: K, listener: (this: webkitRTCPeerConnection, ev: RTCPeerConnectionEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var webkitRTCPeerConnection: {
-    prototype: webkitRTCPeerConnection;
-    new(configuration: RTCConfiguration): webkitRTCPeerConnection;
-};
-
-declare type EventListenerOrEventListenerObject = EventListener | EventListenerObject;
-
-interface DecodeErrorCallback {
-    (error: DOMException): void;
-}
-
-interface DecodeSuccessCallback {
-    (decodedData: AudioBuffer): void;
-}
-
-interface ErrorEventHandler {
-    (event: Event | string, source?: string, fileno?: number, columnNumber?: number, error?: Error): void;
-}
-
-interface EventHandlerNonNull {
-    (event: Event): any;
-}
-
-interface ForEachCallback {
-    (keyId: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null, status: MediaKeyStatus): void;
-}
-
-interface FrameRequestCallback {
-    (time: number): void;
-}
-
-interface FunctionStringCallback {
-    (data: string): void;
-}
-
-interface IntersectionObserverCallback {
-    (entries: IntersectionObserverEntry[], observer: IntersectionObserver): void;
-}
-
-interface MSLaunchUriCallback {
-    (): void;
-}
-
-interface MediaQueryListListener {
-    (mql: MediaQueryList): void;
-}
-
-interface MutationCallback {
-    (mutations: MutationRecord[], observer: MutationObserver): void;
-}
-
-interface NavigatorUserMediaErrorCallback {
-    (error: MediaStreamError): void;
-}
-
-interface NavigatorUserMediaSuccessCallback {
-    (stream: MediaStream): void;
-}
-
-interface NotificationPermissionCallback {
-    (permission: NotificationPermission): void;
-}
-
-interface PositionCallback {
-    (position: Position): void;
-}
-
-interface PositionErrorCallback {
-    (error: PositionError): void;
-}
-
-interface RTCPeerConnectionErrorCallback {
-    (error: DOMError): void;
-}
-
-interface RTCSessionDescriptionCallback {
-    (sdp: RTCSessionDescription): void;
-}
-
-interface RTCStatsCallback {
-    (report: RTCStatsReport): void;
-}
-
-interface VoidFunction {
-    (): void;
-}
-
-interface WritableStreamChunkCallback {
-    (chunk: any, controller: WritableStreamDefaultController): void;
-}
-
-interface WritableStreamDefaultControllerCallback {
-    (controller: WritableStreamDefaultController): void;
-}
-
-interface WritableStreamErrorCallback {
-    (reason: string): void;
-}
-
-interface HTMLElementTagNameMap {
-    "a": HTMLAnchorElement;
-    "abbr": HTMLElement;
-    "acronym": HTMLElement;
-    "address": HTMLElement;
-    "applet": HTMLAppletElement;
-    "area": HTMLAreaElement;
-    "article": HTMLElement;
-    "aside": HTMLElement;
-    "audio": HTMLAudioElement;
-    "b": HTMLElement;
-    "base": HTMLBaseElement;
-    "basefont": HTMLBaseFontElement;
-    "bdo": HTMLElement;
-    "big": HTMLElement;
-    "blockquote": HTMLQuoteElement;
-    "body": HTMLBodyElement;
-    "br": HTMLBRElement;
-    "button": HTMLButtonElement;
-    "canvas": HTMLCanvasElement;
-    "caption": HTMLTableCaptionElement;
-    "center": HTMLElement;
-    "cite": HTMLElement;
-    "code": HTMLElement;
-    "col": HTMLTableColElement;
-    "colgroup": HTMLTableColElement;
-    "data": HTMLDataElement;
-    "datalist": HTMLDataListElement;
-    "dd": HTMLElement;
-    "del": HTMLModElement;
-    "dfn": HTMLElement;
-    "dir": HTMLDirectoryElement;
-    "div": HTMLDivElement;
-    "dl": HTMLDListElement;
-    "dt": HTMLElement;
-    "em": HTMLElement;
-    "embed": HTMLEmbedElement;
-    "fieldset": HTMLFieldSetElement;
-    "figcaption": HTMLElement;
-    "figure": HTMLElement;
-    "font": HTMLFontElement;
-    "footer": HTMLElement;
-    "form": HTMLFormElement;
-    "frame": HTMLFrameElement;
-    "frameset": HTMLFrameSetElement;
-    "h1": HTMLHeadingElement;
-    "h2": HTMLHeadingElement;
-    "h3": HTMLHeadingElement;
-    "h4": HTMLHeadingElement;
-    "h5": HTMLHeadingElement;
-    "h6": HTMLHeadingElement;
-    "head": HTMLHeadElement;
-    "header": HTMLElement;
-    "hgroup": HTMLElement;
-    "hr": HTMLHRElement;
-    "html": HTMLHtmlElement;
-    "i": HTMLElement;
-    "iframe": HTMLIFrameElement;
-    "img": HTMLImageElement;
-    "input": HTMLInputElement;
-    "ins": HTMLModElement;
-    "isindex": HTMLUnknownElement;
-    "kbd": HTMLElement;
-    "keygen": HTMLElement;
-    "label": HTMLLabelElement;
-    "legend": HTMLLegendElement;
-    "li": HTMLLIElement;
-    "link": HTMLLinkElement;
-    "listing": HTMLPreElement;
-    "map": HTMLMapElement;
-    "mark": HTMLElement;
-    "marquee": HTMLMarqueeElement;
-    "menu": HTMLMenuElement;
-    "meta": HTMLMetaElement;
-    "meter": HTMLMeterElement;
-    "nav": HTMLElement;
-    "nextid": HTMLUnknownElement;
-    "nobr": HTMLElement;
-    "noframes": HTMLElement;
-    "noscript": HTMLElement;
-    "object": HTMLObjectElement;
-    "ol": HTMLOListElement;
-    "optgroup": HTMLOptGroupElement;
-    "option": HTMLOptionElement;
-    "output": HTMLOutputElement;
-    "p": HTMLParagraphElement;
-    "param": HTMLParamElement;
-    "picture": HTMLPictureElement;
-    "plaintext": HTMLElement;
-    "pre": HTMLPreElement;
-    "progress": HTMLProgressElement;
-    "q": HTMLQuoteElement;
-    "rt": HTMLElement;
-    "ruby": HTMLElement;
-    "s": HTMLElement;
-    "samp": HTMLElement;
-    "script": HTMLScriptElement;
-    "section": HTMLElement;
-    "select": HTMLSelectElement;
-    "slot": HTMLSlotElement;
-    "small": HTMLElement;
-    "source": HTMLSourceElement;
-    "span": HTMLSpanElement;
-    "strike": HTMLElement;
-    "strong": HTMLElement;
-    "style": HTMLStyleElement;
-    "sub": HTMLElement;
-    "sup": HTMLElement;
-    "table": HTMLTableElement;
-    "tbody": HTMLTableSectionElement;
-    "td": HTMLTableDataCellElement;
-    "template": HTMLTemplateElement;
-    "textarea": HTMLTextAreaElement;
-    "tfoot": HTMLTableSectionElement;
-    "th": HTMLTableHeaderCellElement;
-    "thead": HTMLTableSectionElement;
-    "time": HTMLTimeElement;
-    "title": HTMLTitleElement;
-    "tr": HTMLTableRowElement;
-    "track": HTMLTrackElement;
-    "tt": HTMLElement;
-    "u": HTMLElement;
-    "ul": HTMLUListElement;
-    "var": HTMLElement;
-    "video": HTMLVideoElement;
-    "wbr": HTMLElement;
-    "xmp": HTMLPreElement;
-}
-
-interface SVGElementTagNameMap {
-    "circle": SVGCircleElement;
-    "clippath": SVGClipPathElement;
-    "defs": SVGDefsElement;
-    "desc": SVGDescElement;
-    "ellipse": SVGEllipseElement;
-    "feblend": SVGFEBlendElement;
-    "fecolormatrix": SVGFEColorMatrixElement;
-    "fecomponenttransfer": SVGFEComponentTransferElement;
-    "fecomposite": SVGFECompositeElement;
-    "feconvolvematrix": SVGFEConvolveMatrixElement;
-    "fediffuselighting": SVGFEDiffuseLightingElement;
-    "fedisplacementmap": SVGFEDisplacementMapElement;
-    "fedistantlight": SVGFEDistantLightElement;
-    "feflood": SVGFEFloodElement;
-    "fefunca": SVGFEFuncAElement;
-    "fefuncb": SVGFEFuncBElement;
-    "fefuncg": SVGFEFuncGElement;
-    "fefuncr": SVGFEFuncRElement;
-    "fegaussianblur": SVGFEGaussianBlurElement;
-    "feimage": SVGFEImageElement;
-    "femerge": SVGFEMergeElement;
-    "femergenode": SVGFEMergeNodeElement;
-    "femorphology": SVGFEMorphologyElement;
-    "feoffset": SVGFEOffsetElement;
-    "fepointlight": SVGFEPointLightElement;
-    "fespecularlighting": SVGFESpecularLightingElement;
-    "fespotlight": SVGFESpotLightElement;
-    "fetile": SVGFETileElement;
-    "feturbulence": SVGFETurbulenceElement;
-    "filter": SVGFilterElement;
-    "foreignobject": SVGForeignObjectElement;
-    "g": SVGGElement;
-    "image": SVGImageElement;
-    "line": SVGLineElement;
-    "lineargradient": SVGLinearGradientElement;
-    "marker": SVGMarkerElement;
-    "mask": SVGMaskElement;
-    "metadata": SVGMetadataElement;
-    "path": SVGPathElement;
-    "pattern": SVGPatternElement;
-    "polygon": SVGPolygonElement;
-    "polyline": SVGPolylineElement;
-    "radialgradient": SVGRadialGradientElement;
-    "rect": SVGRectElement;
-    "stop": SVGStopElement;
-    "svg": SVGSVGElement;
-    "switch": SVGSwitchElement;
-    "symbol": SVGSymbolElement;
-    "text": SVGTextElement;
-    "textpath": SVGTextPathElement;
-    "tspan": SVGTSpanElement;
-    "use": SVGUseElement;
-    "view": SVGViewElement;
-}
-
-/** @deprecated Directly use HTMLElementTagNameMap or SVGElementTagNameMap as appropriate, instead. */
-interface ElementTagNameMap extends HTMLElementTagNameMap, SVGElementTagNameMap { }
-
-declare var Audio: {
-    new(src?: string): HTMLAudioElement;
-};
-declare var Image: {
-    new(width?: number, height?: number): HTMLImageElement;
-};
-declare var Option: {
-    new(text?: string, value?: string, defaultSelected?: boolean, selected?: boolean): HTMLOptionElement;
-};
-declare var Blob: typeof Blob;
-declare var URL: typeof URL;
-declare var URLSearchParams: typeof URLSearchParams;
-declare var applicationCache: ApplicationCache;
-declare var caches: CacheStorage;
-declare var clientInformation: Navigator;
-declare var closed: boolean;
-declare var crypto: Crypto;
-declare var customElements: CustomElementRegistry;
-declare var defaultStatus: string;
-declare var devicePixelRatio: number;
-declare var doNotTrack: string;
-declare var document: Document;
-declare var event: Event | undefined;
-declare var external: External;
-declare var frameElement: Element;
-declare var frames: Window;
-declare var history: History;
-declare var innerHeight: number;
-declare var innerWidth: number;
-declare var isSecureContext: boolean;
-declare var length: number;
-declare var location: Location;
-declare var locationbar: BarProp;
-declare var menubar: BarProp;
-declare var msContentScript: ExtensionScriptApis;
-declare var msCredentials: MSCredentials;
-declare const name: never;
-declare var navigator: Navigator;
-declare var offscreenBuffering: string | boolean;
-declare var onabort: ((this: Window, ev: UIEvent) => any) | null;
-declare var onafterprint: ((this: Window, ev: Event) => any) | null;
-declare var onbeforeprint: ((this: Window, ev: Event) => any) | null;
-declare var onbeforeunload: ((this: Window, ev: BeforeUnloadEvent) => any) | null;
-declare var onblur: ((this: Window, ev: FocusEvent) => any) | null;
-declare var oncanplay: ((this: Window, ev: Event) => any) | null;
-declare var oncanplaythrough: ((this: Window, ev: Event) => any) | null;
-declare var onchange: ((this: Window, ev: Event) => any) | null;
-declare var onclick: ((this: Window, ev: MouseEvent) => any) | null;
-declare var oncompassneedscalibration: ((this: Window, ev: Event) => any) | null;
-declare var oncontextmenu: ((this: Window, ev: PointerEvent) => any) | null;
-declare var ondblclick: ((this: Window, ev: MouseEvent) => any) | null;
-declare var ondevicelight: ((this: Window, ev: DeviceLightEvent) => any) | null;
-declare var ondevicemotion: ((this: Window, ev: DeviceMotionEvent) => any) | null;
-declare var ondeviceorientation: ((this: Window, ev: DeviceOrientationEvent) => any) | null;
-declare var ondrag: ((this: Window, ev: DragEvent) => any) | null;
-declare var ondragend: ((this: Window, ev: DragEvent) => any) | null;
-declare var ondragenter: ((this: Window, ev: DragEvent) => any) | null;
-declare var ondragleave: ((this: Window, ev: DragEvent) => any) | null;
-declare var ondragover: ((this: Window, ev: DragEvent) => any) | null;
-declare var ondragstart: ((this: Window, ev: DragEvent) => any) | null;
-declare var ondrop: ((this: Window, ev: DragEvent) => any) | null;
-declare var ondurationchange: ((this: Window, ev: Event) => any) | null;
-declare var onemptied: ((this: Window, ev: Event) => any) | null;
-declare var onended: ((this: Window, ev: Event) => any) | null;
-declare var onerror: ErrorEventHandler;
-declare var onfocus: ((this: Window, ev: FocusEvent) => any) | null;
-declare var onhashchange: ((this: Window, ev: HashChangeEvent) => any) | null;
-declare var oninput: ((this: Window, ev: Event) => any) | null;
-declare var oninvalid: ((this: Window, ev: Event) => any) | null;
-declare var onkeydown: ((this: Window, ev: KeyboardEvent) => any) | null;
-declare var onkeypress: ((this: Window, ev: KeyboardEvent) => any) | null;
-declare var onkeyup: ((this: Window, ev: KeyboardEvent) => any) | null;
-declare var onload: ((this: Window, ev: Event) => any) | null;
-declare var onloadeddata: ((this: Window, ev: Event) => any) | null;
-declare var onloadedmetadata: ((this: Window, ev: Event) => any) | null;
-declare var onloadstart: ((this: Window, ev: Event) => any) | null;
-declare var onmessage: ((this: Window, ev: MessageEvent) => any) | null;
-declare var onmousedown: ((this: Window, ev: MouseEvent) => any) | null;
-declare var onmouseenter: ((this: Window, ev: MouseEvent) => any) | null;
-declare var onmouseleave: ((this: Window, ev: MouseEvent) => any) | null;
-declare var onmousemove: ((this: Window, ev: MouseEvent) => any) | null;
-declare var onmouseout: ((this: Window, ev: MouseEvent) => any) | null;
-declare var onmouseover: ((this: Window, ev: MouseEvent) => any) | null;
-declare var onmouseup: ((this: Window, ev: MouseEvent) => any) | null;
-declare var onmousewheel: ((this: Window, ev: WheelEvent) => any) | null;
-declare var onmsgesturechange: ((this: Window, ev: Event) => any) | null;
-declare var onmsgesturedoubletap: ((this: Window, ev: Event) => any) | null;
-declare var onmsgestureend: ((this: Window, ev: Event) => any) | null;
-declare var onmsgesturehold: ((this: Window, ev: Event) => any) | null;
-declare var onmsgesturestart: ((this: Window, ev: Event) => any) | null;
-declare var onmsgesturetap: ((this: Window, ev: Event) => any) | null;
-declare var onmsinertiastart: ((this: Window, ev: Event) => any) | null;
-declare var onmspointercancel: ((this: Window, ev: Event) => any) | null;
-declare var onmspointerdown: ((this: Window, ev: Event) => any) | null;
-declare var onmspointerenter: ((this: Window, ev: Event) => any) | null;
-declare var onmspointerleave: ((this: Window, ev: Event) => any) | null;
-declare var onmspointermove: ((this: Window, ev: Event) => any) | null;
-declare var onmspointerout: ((this: Window, ev: Event) => any) | null;
-declare var onmspointerover: ((this: Window, ev: Event) => any) | null;
-declare var onmspointerup: ((this: Window, ev: Event) => any) | null;
-declare var onoffline: ((this: Window, ev: Event) => any) | null;
-declare var ononline: ((this: Window, ev: Event) => any) | null;
-declare var onorientationchange: ((this: Window, ev: Event) => any) | null;
-declare var onpagehide: ((this: Window, ev: PageTransitionEvent) => any) | null;
-declare var onpageshow: ((this: Window, ev: PageTransitionEvent) => any) | null;
-declare var onpause: ((this: Window, ev: Event) => any) | null;
-declare var onplay: ((this: Window, ev: Event) => any) | null;
-declare var onplaying: ((this: Window, ev: Event) => any) | null;
-declare var onpopstate: ((this: Window, ev: PopStateEvent) => any) | null;
-declare var onprogress: ((this: Window, ev: ProgressEvent) => any) | null;
-declare var onratechange: ((this: Window, ev: Event) => any) | null;
-declare var onreadystatechange: ((this: Window, ev: ProgressEvent) => any) | null;
-declare var onreset: ((this: Window, ev: Event) => any) | null;
-declare var onresize: ((this: Window, ev: UIEvent) => any) | null;
-declare var onscroll: ((this: Window, ev: UIEvent) => any) | null;
-declare var onseeked: ((this: Window, ev: Event) => any) | null;
-declare var onseeking: ((this: Window, ev: Event) => any) | null;
-declare var onselect: ((this: Window, ev: UIEvent) => any) | null;
-declare var onstalled: ((this: Window, ev: Event) => any) | null;
-declare var onstorage: ((this: Window, ev: StorageEvent) => any) | null;
-declare var onsubmit: ((this: Window, ev: Event) => any) | null;
-declare var onsuspend: ((this: Window, ev: Event) => any) | null;
-declare var ontimeupdate: ((this: Window, ev: Event) => any) | null;
-declare var ontouchcancel: (ev: TouchEvent) => any;
-declare var ontouchend: (ev: TouchEvent) => any;
-declare var ontouchmove: (ev: TouchEvent) => any;
-declare var ontouchstart: (ev: TouchEvent) => any;
-declare var onunload: ((this: Window, ev: Event) => any) | null;
-declare var onvolumechange: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplayactivate: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplayblur: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplayconnect: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplaydeactivate: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplaydisconnect: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplayfocus: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplaypointerrestricted: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplaypointerunrestricted: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplaypresentchange: ((this: Window, ev: Event) => any) | null;
-declare var onwaiting: ((this: Window, ev: Event) => any) | null;
-declare var opener: any;
-declare var orientation: string | number;
-declare var outerHeight: number;
-declare var outerWidth: number;
-declare var pageXOffset: number;
-declare var pageYOffset: number;
-declare var parent: Window;
-declare var performance: Performance;
-declare var personalbar: BarProp;
-declare var screen: Screen;
-declare var screenLeft: number;
-declare var screenTop: number;
-declare var screenX: number;
-declare var screenY: number;
-declare var scrollX: number;
-declare var scrollY: number;
-declare var scrollbars: BarProp;
-declare var self: Window;
-declare var speechSynthesis: SpeechSynthesis;
-declare var status: string;
-declare var statusbar: BarProp;
-declare var styleMedia: StyleMedia;
-declare var toolbar: BarProp;
-declare var top: Window;
-declare var window: Window;
-declare function alert(message?: any): void;
-declare function blur(): void;
-declare function cancelAnimationFrame(handle: number): void;
-declare function captureEvents(): void;
-declare function close(): void;
-declare function confirm(message?: string): boolean;
-declare function createImageBitmap(image: HTMLImageElement | SVGImageElement | HTMLVideoElement | HTMLCanvasElement | ImageBitmap | ImageData | Blob, options?: ImageBitmapOptions): Promise<ImageBitmap>;
-declare function createImageBitmap(image: HTMLImageElement | SVGImageElement | HTMLVideoElement | HTMLCanvasElement | ImageBitmap | ImageData | Blob, sx: number, sy: number, sw: number, sh: number, options?: ImageBitmapOptions): Promise<ImageBitmap>;
-declare function departFocus(navigationReason: NavigationReason, origin: FocusNavigationOrigin): void;
-declare function focus(): void;
-declare function getComputedStyle(elt: Element, pseudoElt?: string | null): CSSStyleDeclaration;
-declare function getMatchedCSSRules(elt: Element, pseudoElt?: string | null): CSSRuleList;
-declare function getSelection(): Selection;
-declare function matchMedia(mediaQuery: string): MediaQueryList;
-declare function moveBy(x?: number, y?: number): void;
-declare function moveTo(x?: number, y?: number): void;
-declare function msWriteProfilerMark(profilerMarkName: string): void;
-declare function open(url?: string, target?: string, features?: string, replace?: boolean): Window | null;
-declare function postMessage(message: any, targetOrigin: string, transfer?: any[]): void;
-declare function print(): void;
-declare function prompt(message?: string, _default?: string): string | null;
-declare function releaseEvents(): void;
-declare function requestAnimationFrame(callback: FrameRequestCallback): number;
-declare function resizeBy(x?: number, y?: number): void;
-declare function resizeTo(x?: number, y?: number): void;
-declare function scroll(options?: ScrollToOptions): void;
-declare function scroll(x?: number, y?: number): void;
-declare function scrollBy(options?: ScrollToOptions): void;
-declare function scrollBy(x?: number, y?: number): void;
-declare function scrollTo(options?: ScrollToOptions): void;
-declare function scrollTo(x?: number, y?: number): void;
-declare function stop(): void;
-declare function webkitCancelAnimationFrame(handle: number): void;
-declare function webkitConvertPointFromNodeToPage(node: Node, pt: WebKitPoint): WebKitPoint;
-declare function webkitConvertPointFromPageToNode(node: Node, pt: WebKitPoint): WebKitPoint;
-declare function webkitRequestAnimationFrame(callback: FrameRequestCallback): number;
-declare function toString(): string;
-declare function dispatchEvent(evt: Event): boolean;
-declare function clearInterval(handle?: number): void;
-declare function clearTimeout(handle?: number): void;
-declare function setInterval(handler: (...args: any[]) => void, timeout: number): number;
-declare function setInterval(handler: any, timeout?: any, ...args: any[]): number;
-declare function setTimeout(handler: (...args: any[]) => void, timeout: number): number;
-declare function setTimeout(handler: any, timeout?: any, ...args: any[]): number;
-declare function clearImmediate(handle: number): void;
-declare function setImmediate(handler: (...args: any[]) => void): number;
-declare function setImmediate(handler: any, ...args: any[]): number;
-declare var sessionStorage: Storage;
-declare var localStorage: Storage;
-declare var console: Console;
-declare var onpointercancel: ((this: Window, ev: PointerEvent) => any) | null;
-declare var onpointerdown: ((this: Window, ev: PointerEvent) => any) | null;
-declare var onpointerenter: ((this: Window, ev: PointerEvent) => any) | null;
-declare var onpointerleave: ((this: Window, ev: PointerEvent) => any) | null;
-declare var onpointermove: ((this: Window, ev: PointerEvent) => any) | null;
-declare var onpointerout: ((this: Window, ev: PointerEvent) => any) | null;
-declare var onpointerover: ((this: Window, ev: PointerEvent) => any) | null;
-declare var onpointerup: ((this: Window, ev: PointerEvent) => any) | null;
-declare var onwheel: ((this: Window, ev: WheelEvent) => any) | null;
-declare var indexedDB: IDBFactory;
-declare function atob(encodedString: string): string;
-declare function btoa(rawString: string): string;
-declare function fetch(input?: Request | string, init?: RequestInit): Promise<Response>;
-declare function addEventListener<K extends keyof WindowEventMap>(type: K, listener: (this: Window, ev: WindowEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-declare function addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-declare function removeEventListener<K extends keyof WindowEventMap>(type: K, listener: (this: Window, ev: WindowEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-declare function removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-type ScrollBehavior = "auto" | "instant" | "smooth";
-type ScrollLogicalPosition = "start" | "center" | "end" | "nearest";
-type MouseWheelEvent = WheelEvent;
-type ScrollRestoration = "auto" | "manual";
-type FormDataEntryValue = string | File;
-type InsertPosition = "beforebegin" | "afterbegin" | "beforeend" | "afterend";
-type HeadersInit = Headers | string[][] | { [key: string]: string };
-type OrientationLockType = "any" | "natural" | "portrait" | "landscape" | "portrait-primary" | "portrait-secondary" | "landscape-primary"| "landscape-secondary";
-type IDBValidKey = number | string | Date | IDBArrayKey;
-type AlgorithmIdentifier = string | Algorithm;
-type MutationRecordType = "attributes" | "characterData" | "childList";
-type AAGUID = string;
-type BodyInit = any;
-type ByteString = string;
-type ConstrainBoolean = boolean | ConstrainBooleanParameters;
-type ConstrainDOMString = string | string[] | ConstrainDOMStringParameters;
-type ConstrainDouble = number | ConstrainDoubleRange;
-type ConstrainLong = number | ConstrainLongRange;
-type CryptoOperationData = ArrayBufferView;
-type GLbitfield = number;
-type GLboolean = boolean;
-type GLbyte = number;
-type GLclampf = number;
-type GLenum = number;
-type GLfloat = number;
-type GLint = number;
-type GLintptr = number;
-type GLshort = number;
-type GLsizei = number;
-type GLsizeiptr = number;
-type GLubyte = number;
-type GLuint = number;
-type GLushort = number;
-type IDBKeyPath = string;
-type MSInboundPayload = MSVideoRecvPayload | MSAudioRecvPayload;
-type MSLocalClientEvent = MSLocalClientEventBase | MSAudioLocalClientEvent;
-type MSOutboundPayload = MSVideoSendPayload | MSAudioSendPayload;
-type RTCIceGatherCandidate = RTCIceCandidateDictionary | RTCIceCandidateComplete;
-type RTCTransport = RTCDtlsTransport | RTCSrtpSdesTransport;
-type RequestInfo = Request | string;
-type USVString = string;
-type payloadtype = number;
-type BufferSource = ArrayBuffer | ArrayBufferView;
-type ClientTypes = "window" | "worker" | "sharedworker" | "all";
-type AppendMode = "segments" | "sequence";
-type AudioContextLatencyCategory = "balanced" | "interactive" | "playback";
-type AudioContextState = "suspended" | "running" | "closed";
-type BinaryType = "blob" | "arraybuffer";
-type BiquadFilterType = "lowpass" | "highpass" | "bandpass" | "lowshelf" | "highshelf" | "peaking" | "notch" | "allpass";
-type CanPlayTypeResult = "" | "maybe" | "probably";
-type CanvasFillRule = "nonzero" | "evenodd";
-type ChannelCountMode = "max" | "clamped-max" | "explicit";
-type ChannelInterpretation = "speakers" | "discrete";
-type DisplayCaptureSurfaceType = "monitor" | "window" | "application" | "browser";
-type DistanceModelType = "linear" | "inverse" | "exponential";
-type DocumentReadyState = "loading" | "interactive" | "complete";
-type EndOfStreamError = "network" | "decode";
-type ExpandGranularity = "character" | "word" | "sentence" | "textedit";
-type GamepadHand = "" | "left" | "right";
-type GamepadHapticActuatorType = "vibration";
-type GamepadInputEmulationType = "mouse" | "keyboard" | "gamepad";
-type GamepadMappingType = "" | "standard";
-type IDBCursorDirection = "next" | "nextunique" | "prev" | "prevunique";
-type IDBRequestReadyState = "pending" | "done";
-type IDBTransactionMode = "readonly" | "readwrite" | "versionchange";
-type KeyFormat = "raw" | "spki" | "pkcs8" | "jwk";
-type KeyType = "public" | "private" | "secret";
-type KeyUsage = "encrypt" | "decrypt" | "sign" | "verify" | "deriveKey" | "deriveBits" | "wrapKey" | "unwrapKey";
-type ListeningState = "inactive" | "active" | "disambiguation";
-type MSCredentialType = "FIDO_2_0";
-type MSIceAddrType = "os" | "stun" | "turn" | "peer-derived";
-type MSIceType = "failed" | "direct" | "relay";
-type MSStatsType = "description" | "localclientevent" | "inbound-network" | "outbound-network" | "inbound-payload" | "outbound-payload" | "transportdiagnostics";
-type MSTransportType = "Embedded" | "USB" | "NFC" | "BT";
-type MSWebViewPermissionState = "unknown" | "defer" | "allow" | "deny";
-type MSWebViewPermissionType = "geolocation" | "unlimitedIndexedDBQuota" | "media" | "pointerlock" | "webnotifications";
-type MediaDeviceKind = "audioinput" | "audiooutput" | "videoinput";
-type MediaKeyMessageType = "license-request" | "license-renewal" | "license-release" | "individualization-request";
-type MediaKeySessionType = "temporary" | "persistent-license" | "persistent-release-message";
-type MediaKeyStatus = "usable" | "expired" | "output-downscaled" | "output-not-allowed" | "status-pending" | "internal-error";
-type MediaKeysRequirement = "required" | "optional" | "not-allowed";
-type MediaStreamTrackState = "live" | "ended";
-type NavigationReason = "up" | "down" | "left" | "right";
-type NavigationType = "navigate" | "reload" | "back_forward" | "prerender";
-type NotificationDirection = "auto" | "ltr" | "rtl";
-type NotificationPermission = "default" | "denied" | "granted";
-type OscillatorType = "sine" | "square" | "sawtooth" | "triangle" | "custom";
-type OverSampleType = "none" | "2x" | "4x";
-type PanningModelType = "equalpower" | "HRTF";
-type PaymentComplete = "success" | "fail" | "unknown";
-type PaymentShippingType = "shipping" | "delivery" | "pickup";
-type PushEncryptionKeyName = "p256dh" | "auth";
-type PushPermissionState = "granted" | "denied" | "prompt";
-type RTCBundlePolicy = "balanced" | "max-compat" | "max-bundle";
-type RTCDegradationPreference = "maintain-framerate" | "maintain-resolution" | "balanced";
-type RTCDtlsRole = "auto" | "client" | "server";
-type RTCDtlsTransportState = "new" | "connecting" | "connected" | "closed";
-type RTCIceCandidateType = "host" | "srflx" | "prflx" | "relay";
-type RTCIceComponent = "RTP" | "RTCP";
-type RTCIceConnectionState = "new" | "checking" | "connected" | "completed" | "failed" | "disconnected" | "closed";
-type RTCIceGatherPolicy = "all" | "nohost" | "relay";
-type RTCIceGathererState = "new" | "gathering" | "complete";
-type RTCIceGatheringState = "new" | "gathering" | "complete";
-type RTCIceProtocol = "udp" | "tcp";
-type RTCIceRole = "controlling" | "controlled";
-type RTCIceTcpCandidateType = "active" | "passive" | "so";
-type RTCIceTransportPolicy = "none" | "relay" | "all";
-type RTCIceTransportState = "new" | "checking" | "connected" | "completed" | "disconnected" | "closed";
-type RTCSdpType = "offer" | "pranswer" | "answer";
-type RTCSignalingState = "stable" | "have-local-offer" | "have-remote-offer" | "have-local-pranswer" | "have-remote-pranswer" | "closed";
-type RTCStatsIceCandidatePairState = "frozen" | "waiting" | "inprogress" | "failed" | "succeeded" | "cancelled";
-type RTCStatsIceCandidateType = "host" | "serverreflexive" | "peerreflexive" | "relayed";
-type RTCStatsType = "inboundrtp" | "outboundrtp" | "session" | "datachannel" | "track" | "transport" | "candidatepair" | "localcandidate" | "remotecandidate";
-type ReadyState = "closed" | "open" | "ended";
-type ReferrerPolicy = "" | "no-referrer" | "no-referrer-when-downgrade" | "origin-only" | "origin-when-cross-origin" | "unsafe-url";
-type RequestCache = "default" | "no-store" | "reload" | "no-cache" | "force-cache";
-type RequestCredentials = "omit" | "same-origin" | "include";
-type RequestDestination = "" | "document" | "sharedworker" | "subresource" | "unknown" | "worker";
-type RequestMode = "navigate" | "same-origin" | "no-cors" | "cors";
-type RequestRedirect = "follow" | "error" | "manual";
-type RequestType = "" | "audio" | "font" | "image" | "script" | "style" | "track" | "video";
-type ResponseType = "basic" | "cors" | "default" | "error" | "opaque" | "opaqueredirect";
-type ScopedCredentialType = "ScopedCred";
-type ServiceWorkerState = "installing" | "installed" | "activating" | "activated" | "redundant";
-type TextTrackKind = "subtitles" | "captions" | "descriptions" | "chapters" | "metadata";
-type TextTrackMode = "disabled" | "hidden" | "showing";
-type Transport = "usb" | "nfc" | "ble";
-type VRDisplayEventReason = "mounted" | "navigation" | "requested" | "unmounted";
-type VREye = "left" | "right";
-type VideoFacingModeEnum = "user" | "environment" | "left" | "right";
-type VisibilityState = "hidden" | "visible" | "prerender" | "unloaded";
-type XMLHttpRequestResponseType = "" | "arraybuffer" | "blob" | "document" | "json" | "text";
-
-
-/////////////////////////////
-/// WorkerGlobalScope APIs
-/////////////////////////////
-// These are only available in a Web Worker
-declare function importScripts(...urls: string[]): void;
-
-
-
-
-/////////////////////////////
-/// Windows Script Host APIS
-/////////////////////////////
-
-
-interface ActiveXObject {
-    new (s: string): any;
-}
-declare var ActiveXObject: ActiveXObject;
-
-interface ITextWriter {
-    Write(s: string): void;
-    WriteLine(s: string): void;
-    Close(): void;
-}
-
-interface TextStreamBase {
-    /**
-     * The column number of the current character position in an input stream.
-     */
-    Column: number;
-
-    /**
-     * The current line number in an input stream.
-     */
-    Line: number;
-
-    /**
-     * Closes a text stream.
-     * It is not necessary to close standard streams; they close automatically when the process ends. If
-     * you close a standard stream, be aware that any other pointers to that standard stream become invalid.
-     */
-    Close(): void;
-}
-
-interface TextStreamWriter extends TextStreamBase {
-    /**
-     * Sends a string to an output stream.
-     */
-    Write(s: string): void;
-
-    /**
-     * Sends a specified number of blank lines (newline characters) to an output stream.
-     */
-    WriteBlankLines(intLines: number): void;
-
-    /**
-     * Sends a string followed by a newline character to an output stream.
-     */
-    WriteLine(s: string): void;
-}
-
-interface TextStreamReader extends TextStreamBase {
-    /**
-     * Returns a specified number of characters from an input stream, starting at the current pointer position.
-     * Does not return until the ENTER key is pressed.
-     * Can only be used on a stream in reading mode; causes an error in writing or appending mode.
-     */
-    Read(characters: number): string;
-
-    /**
-     * Returns all characters from an input stream.
-     * Can only be used on a stream in reading mode; causes an error in writing or appending mode.
-     */
-    ReadAll(): string;
-
-    /**
-     * Returns an entire line from an input stream.
-     * Although this method extracts the newline character, it does not add it to the returned string.
-     * Can only be used on a stream in reading mode; causes an error in writing or appending mode.
-     */
-    ReadLine(): string;
-
-    /**
-     * Skips a specified number of characters when reading from an input text stream.
-     * Can only be used on a stream in reading mode; causes an error in writing or appending mode.
-     * @param characters Positive number of characters to skip forward. (Backward skipping is not supported.)
-     */
-    Skip(characters: number): void;
-
-    /**
-     * Skips the next line when reading from an input text stream.
-     * Can only be used on a stream in reading mode, not writing or appending mode.
-     */
-    SkipLine(): void;
-
-    /**
-     * Indicates whether the stream pointer position is at the end of a line.
-     */
-    AtEndOfLine: boolean;
-
-    /**
-     * Indicates whether the stream pointer position is at the end of a stream.
-     */
-    AtEndOfStream: boolean;
-}
-
-declare var WScript: {
-    /**
-     * Outputs text to either a message box (under WScript.exe) or the command console window followed by
-     * a newline (under CScript.exe).
-     */
-    Echo(s: any): void;
-
-    /**
-     * Exposes the write-only error output stream for the current script.
-     * Can be accessed only while using CScript.exe.
-     */
-    StdErr: TextStreamWriter;
-
-    /**
-     * Exposes the write-only output stream for the current script.
-     * Can be accessed only while using CScript.exe.
-     */
-    StdOut: TextStreamWriter;
-    Arguments: { length: number; Item(n: number): string; };
-
-    /**
-     *  The full path of the currently running script.
-     */
-    ScriptFullName: string;
-
-    /**
-     * Forces the script to stop immediately, with an optional exit code.
-     */
-    Quit(exitCode?: number): number;
-
-    /**
-     * The Windows Script Host build version number.
-     */
-    BuildVersion: number;
-
-    /**
-     * Fully qualified path of the host executable.
-     */
-    FullName: string;
-
-    /**
-     * Gets/sets the script mode - interactive(true) or batch(false).
-     */
-    Interactive: boolean;
-
-    /**
-     * The name of the host executable (WScript.exe or CScript.exe).
-     */
-    Name: string;
-
-    /**
-     * Path of the directory containing the host executable.
-     */
-    Path: string;
-
-    /**
-     * The filename of the currently running script.
-     */
-    ScriptName: string;
-
-    /**
-     * Exposes the read-only input stream for the current script.
-     * Can be accessed only while using CScript.exe.
-     */
-    StdIn: TextStreamReader;
-
-    /**
-     * Windows Script Host version
-     */
-    Version: string;
-
-    /**
-     * Connects a COM object's event sources to functions named with a given prefix, in the form prefix_event.
-     */
-    ConnectObject(objEventSource: any, strPrefix: string): void;
-
-    /**
-     * Creates a COM object.
-     * @param strProgiID
-     * @param strPrefix Function names in the form prefix_event will be bound to this object's COM events.
-     */
-    CreateObject(strProgID: string, strPrefix?: string): any;
-
-    /**
-     * Disconnects a COM object from its event sources.
-     */
-    DisconnectObject(obj: any): void;
-
-    /**
-     * Retrieves an existing object with the specified ProgID from memory, or creates a new one from a file.
-     * @param strPathname Fully qualified path to the file containing the object persisted to disk.
-     *                       For objects in memory, pass a zero-length string.
-     * @param strProgID
-     * @param strPrefix Function names in the form prefix_event will be bound to this object's COM events.
-     */
-    GetObject(strPathname: string, strProgID?: string, strPrefix?: string): any;
-
-    /**
-     * Suspends script execution for a specified length of time, then continues execution.
-     * @param intTime Interval (in milliseconds) to suspend script execution.
-     */
-    Sleep(intTime: number): void;
-};
-
-/**
- * WSH is an alias for WScript under Windows Script Host
- */
-declare var WSH: typeof WScript;
-
-/**
- * Represents an Automation SAFEARRAY
- */
-declare class SafeArray<T = any> {
-    private constructor();
-    private SafeArray_typekey: SafeArray<T>;
-}
-
-/**
- * Allows enumerating over a COM collection, which may not have indexed item access.
- */
-interface Enumerator<T = any> {
-    /**
-     * Returns true if the current item is the last one in the collection, or the collection is empty,
-     * or the current item is undefined.
-     */
-    atEnd(): boolean;
-
-    /**
-     * Returns the current item in the collection
-     */
-    item(): T;
-
-    /**
-     * Resets the current item in the collection to the first item. If there are no items in the collection,
-     * the current item is set to undefined.
-     */
-    moveFirst(): void;
-
-    /**
-     * Moves the current item to the next item in the collection. If the enumerator is at the end of
-     * the collection or the collection is empty, the current item is set to undefined.
-     */
-    moveNext(): void;
-}
-
-interface EnumeratorConstructor {
-    new <T = any>(safearray: SafeArray<T>): Enumerator<T>;
-    new <T = any>(collection: { Item(index: any): T }): Enumerator<T>;
-    new <T = any>(collection: any): Enumerator<T>;
-}
-
-declare var Enumerator: EnumeratorConstructor;
-
-/**
- * Enables reading from a COM safe array, which might have an alternate lower bound, or multiple dimensions.
- */
-interface VBArray<T = any> {
-    /**
-     * Returns the number of dimensions (1-based).
-     */
-    dimensions(): number;
-
-    /**
-     * Takes an index for each dimension in the array, and returns the item at the corresponding location.
-     */
-    getItem(dimension1Index: number, ...dimensionNIndexes: number[]): T;
-
-    /**
-     * Returns the smallest available index for a given dimension.
-     * @param dimension 1-based dimension (defaults to 1)
-     */
-    lbound(dimension?: number): number;
-
-    /**
-     * Returns the largest available index for a given dimension.
-     * @param dimension 1-based dimension (defaults to 1)
-     */
-    ubound(dimension?: number): number;
-
-    /**
-     * Returns a Javascript array with all the elements in the VBArray. If there are multiple dimensions,
-     * each successive dimension is appended to the end of the array.
-     * Example: [[1,2,3],[4,5,6]] becomes [1,2,3,4,5,6]
-     */
-    toArray(): T[];
-}
-
-interface VBArrayConstructor {
-    new <T = any>(safeArray: SafeArray<T>): VBArray<T>;
-}
-
-declare var VBArray: VBArrayConstructor;
-
-/**
- * Automation date (VT_DATE)
- */
-declare class VarDate {
-    private constructor();
-    private VarDate_typekey: VarDate;
-}
-
-interface DateConstructor {
-    new (vd: VarDate): Date;
-}
-
-interface Date {
-    getVarDate: () => VarDate;
-}
-
-
-/// <reference path="lib.dom.d.ts" />
-
-interface DOMTokenList {
-    [Symbol.iterator](): IterableIterator<string>;
-}
-
-interface Headers {
-    [Symbol.iterator](): IterableIterator<[string, string]>;
-    /**
-     * Returns an iterator allowing to go through all key/value pairs contained in this object.
-     */
-    entries(): IterableIterator<[string, string]>;
-    /**
-     * Returns an iterator allowing to go through all keys f the key/value pairs contained in this object.
-     */
-    keys(): IterableIterator<string>;
-    /**
-     * Returns an iterator allowing to go through all values of the key/value pairs contained in this object.
-     */
-    values(): IterableIterator<string>;
-}
-
-interface NodeList {
-    /**
-     * Returns an array of key, value pairs for every entry in the list
-     */
-    entries(): IterableIterator<[number, Node]>;
-    /**
-     * Performs the specified action for each node in an list.
-     * @param callbackfn  A function that accepts up to three arguments. forEach calls the callbackfn function one time for each element in the list.
-     * @param thisArg  An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
-     */
-    forEach(callbackfn: (value: Node, index: number, listObj: NodeList) => void, thisArg?: any): void;
-    /**
-     * Returns an list of keys in the list
-     */
-    keys(): IterableIterator<number>;
-
-    /**
-     * Returns an list of values in the list
-     */
-    values(): IterableIterator<Node>;
-
-
-    [Symbol.iterator](): IterableIterator<Node>;
-}
-
-interface NodeListOf<TNode extends Node> {
-
-    /**
-     * Returns an array of key, value pairs for every entry in the list
-     */
-    entries(): IterableIterator<[number, TNode]>;
-
-    /**
-     * Performs the specified action for each node in an list.
-     * @param callbackfn  A function that accepts up to three arguments. forEach calls the callbackfn function one time for each element in the list.
-     * @param thisArg  An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
-     */
-    forEach(callbackfn: (value: TNode, index: number, listObj: NodeListOf<TNode>) => void, thisArg?: any): void;
-    /**
-     * Returns an list of keys in the list
-     */
-    keys(): IterableIterator<number>;
-    /**
-     * Returns an list of values in the list
-     */
-    values(): IterableIterator<TNode>;
-
-    [Symbol.iterator](): IterableIterator<TNode>;
-}
-
-interface HTMLCollectionBase {
-    [Symbol.iterator](): IterableIterator<Element>;
-}
-
-interface HTMLCollectionOf<T extends Element> {
-    [Symbol.iterator](): IterableIterator<T>;
-}
-
-interface FormData {
-    /**
-     * Returns an array of key, value pairs for every entry in the list
-     */
-    entries(): IterableIterator<[string, string | File]>;
-    /**
-     * Returns a list of keys in the list
-     */
-    keys(): IterableIterator<string>;
-    /**
-     * Returns a list of values in the list
-     */
-    values(): IterableIterator<string | File>;
-
-    [Symbol.iterator](): IterableIterator<string | File>;
-}
-
-interface URLSearchParams {
-    /**
-     * Returns an array of key, value pairs for every entry in the search params
-     */
-    entries(): IterableIterator<[string, string]>;
-    /**
-     * Returns a list of keys in the search params
-     */
-    keys(): IterableIterator<string>;
-    /**
-     * Returns a list of values in the search params
-     */
-    values(): IterableIterator<string>;
-    /**
-     * iterate over key/value pairs
-     */
-    [Symbol.iterator](): IterableIterator<[string, string]>;
-}
+/// <reference lib="es2018" />
+/// <reference lib="dom" />
+/// <reference lib="webworker.importscripts" />
+/// <reference lib="scripthost" />
+/// <reference lib="dom.iterable" />
\ No newline at end of file
diff --git a/lib/lib.es6.d.ts b/lib/lib.es6.d.ts
index 9ba2831332b..6149c4a291c 100644
--- a/lib/lib.es6.d.ts
+++ b/lib/lib.es6.d.ts
@@ -18,22321 +18,8 @@ and limitations under the License.
 /// <reference no-default-lib="true"/>
 
 
-/////////////////////////////
-/// ECMAScript APIs
-/////////////////////////////
-
-declare const NaN: number;
-declare const Infinity: number;
-
-/**
-  * Evaluates JavaScript code and executes it.
-  * @param x A String value that contains valid JavaScript code.
-  */
-declare function eval(x: string): any;
-
-/**
-  * Converts A string to an integer.
-  * @param s A string to convert into a number.
-  * @param radix A value between 2 and 36 that specifies the base of the number in numString.
-  * If this argument is not supplied, strings with a prefix of '0x' are considered hexadecimal.
-  * All other strings are considered decimal.
-  */
-declare function parseInt(s: string, radix?: number): number;
-
-/**
-  * Converts a string to a floating-point number.
-  * @param string A string that contains a floating-point number.
-  */
-declare function parseFloat(string: string): number;
-
-/**
-  * Returns a Boolean value that indicates whether a value is the reserved value NaN (not a number).
-  * @param number A numeric value.
-  */
-declare function isNaN(number: number): boolean;
-
-/**
-  * Determines whether a supplied number is finite.
-  * @param number Any numeric value.
-  */
-declare function isFinite(number: number): boolean;
-
-/**
-  * Gets the unencoded version of an encoded Uniform Resource Identifier (URI).
-  * @param encodedURI A value representing an encoded URI.
-  */
-declare function decodeURI(encodedURI: string): string;
-
-/**
-  * Gets the unencoded version of an encoded component of a Uniform Resource Identifier (URI).
-  * @param encodedURIComponent A value representing an encoded URI component.
-  */
-declare function decodeURIComponent(encodedURIComponent: string): string;
-
-/**
-  * Encodes a text string as a valid Uniform Resource Identifier (URI)
-  * @param uri A value representing an encoded URI.
-  */
-declare function encodeURI(uri: string): string;
-
-/**
-  * Encodes a text string as a valid component of a Uniform Resource Identifier (URI).
-  * @param uriComponent A value representing an encoded URI component.
-  */
-declare function encodeURIComponent(uriComponent: string): string;
-
-/**
-  * Computes a new string in which certain characters have been replaced by a hexadecimal escape sequence.
-  * @param string A string value
-  */
-declare function escape(string: string): string;
-
-/**
-  * Computes a new string in which hexadecimal escape sequences are replaced with the character that it represents.
-  * @param string A string value
-  */
-declare function unescape(string: string): string;
-
-interface Symbol {
-  /** Returns a string representation of an object. */
-  toString(): string;
-
-  /** Returns the primitive value of the specified object. */
-  valueOf(): symbol;
-}
-
-declare type PropertyKey = string | number | symbol;
-
-interface PropertyDescriptor {
-    configurable?: boolean;
-    enumerable?: boolean;
-    value?: any;
-    writable?: boolean;
-    get?(): any;
-    set?(v: any): void;
-}
-
-interface PropertyDescriptorMap {
-    [s: string]: PropertyDescriptor;
-}
-
-interface Object {
-    /** The initial value of Object.prototype.constructor is the standard built-in Object constructor. */
-    constructor: Function;
-
-    /** Returns a string representation of an object. */
-    toString(): string;
-
-    /** Returns a date converted to a string using the current locale. */
-    toLocaleString(): string;
-
-    /** Returns the primitive value of the specified object. */
-    valueOf(): Object;
-
-    /**
-      * Determines whether an object has a property with the specified name.
-      * @param v A property name.
-      */
-    hasOwnProperty(v: PropertyKey): boolean;
-
-    /**
-      * Determines whether an object exists in another object's prototype chain.
-      * @param v Another object whose prototype chain is to be checked.
-      */
-    isPrototypeOf(v: Object): boolean;
-
-    /**
-      * Determines whether a specified property is enumerable.
-      * @param v A property name.
-      */
-    propertyIsEnumerable(v: PropertyKey): boolean;
-}
-
-interface ObjectConstructor {
-    new(value?: any): Object;
-    (): any;
-    (value: any): any;
-
-    /** A reference to the prototype for a class of objects. */
-    readonly prototype: Object;
-
-    /**
-      * Returns the prototype of an object.
-      * @param o The object that references the prototype.
-      */
-    getPrototypeOf(o: any): any;
-
-    /**
-      * Gets the own property descriptor of the specified object.
-      * An own property descriptor is one that is defined directly on the object and is not inherited from the object's prototype.
-      * @param o Object that contains the property.
-      * @param p Name of the property.
-    */
-    getOwnPropertyDescriptor(o: any, p: PropertyKey): PropertyDescriptor | undefined;
-
-    /**
-      * Returns the names of the own properties of an object. The own properties of an object are those that are defined directly
-      * on that object, and are not inherited from the object's prototype. The properties of an object include both fields (objects) and functions.
-      * @param o Object that contains the own properties.
-      */
-    getOwnPropertyNames(o: any): string[];
-
-    /**
-      * Creates an object that has the specified prototype or that has null prototype.
-      * @param o Object to use as a prototype. May be null.
-      */
-    create(o: object | null): any;
-
-    /**
-      * Creates an object that has the specified prototype, and that optionally contains specified properties.
-      * @param o Object to use as a prototype. May be null
-      * @param properties JavaScript object that contains one or more property descriptors.
-      */
-    create(o: object | null, properties: PropertyDescriptorMap & ThisType<any>): any;
-
-    /**
-      * Adds a property to an object, or modifies attributes of an existing property.
-      * @param o Object on which to add or modify the property. This can be a native JavaScript object (that is, a user-defined object or a built in object) or a DOM object.
-      * @param p The property name.
-      * @param attributes Descriptor for the property. It can be for a data property or an accessor property.
-      */
-    defineProperty(o: any, p: PropertyKey, attributes: PropertyDescriptor & ThisType<any>): any;
-
-    /**
-      * Adds one or more properties to an object, and/or modifies attributes of existing properties.
-      * @param o Object on which to add or modify the properties. This can be a native JavaScript object or a DOM object.
-      * @param properties JavaScript object that contains one or more descriptor objects. Each descriptor object describes a data property or an accessor property.
-      */
-    defineProperties(o: any, properties: PropertyDescriptorMap & ThisType<any>): any;
-
-    /**
-      * Prevents the modification of attributes of existing properties, and prevents the addition of new properties.
-      * @param o Object on which to lock the attributes.
-      */
-    seal<T>(o: T): T;
-
-    /**
-      * Prevents the modification of existing property attributes and values, and prevents the addition of new properties.
-      * @param o Object on which to lock the attributes.
-      */
-    freeze<T>(a: T[]): ReadonlyArray<T>;
-
-    /**
-      * Prevents the modification of existing property attributes and values, and prevents the addition of new properties.
-      * @param o Object on which to lock the attributes.
-      */
-    freeze<T extends Function>(f: T): T;
-
-    /**
-      * Prevents the modification of existing property attributes and values, and prevents the addition of new properties.
-      * @param o Object on which to lock the attributes.
-      */
-    freeze<T>(o: T): Readonly<T>;
-
-    /**
-      * Prevents the addition of new properties to an object.
-      * @param o Object to make non-extensible.
-      */
-    preventExtensions<T>(o: T): T;
-
-    /**
-      * Returns true if existing property attributes cannot be modified in an object and new properties cannot be added to the object.
-      * @param o Object to test.
-      */
-    isSealed(o: any): boolean;
-
-    /**
-      * Returns true if existing property attributes and values cannot be modified in an object, and new properties cannot be added to the object.
-      * @param o Object to test.
-      */
-    isFrozen(o: any): boolean;
-
-    /**
-      * Returns a value that indicates whether new properties can be added to an object.
-      * @param o Object to test.
-      */
-    isExtensible(o: any): boolean;
-
-    /**
-      * Returns the names of the enumerable properties and methods of an object.
-      * @param o Object that contains the properties and methods. This can be an object that you created or an existing Document Object Model (DOM) object.
-      */
-    keys(o: {}): string[];
-}
-
-/**
-  * Provides functionality common to all JavaScript objects.
-  */
-declare const Object: ObjectConstructor;
-
-/**
-  * Creates a new function.
-  */
-interface Function {
-    /**
-      * Calls the function, substituting the specified object for the this value of the function, and the specified array for the arguments of the function.
-      * @param thisArg The object to be used as the this object.
-      * @param argArray A set of arguments to be passed to the function.
-      */
-    apply(this: Function, thisArg: any, argArray?: any): any;
-
-    /**
-      * Calls a method of an object, substituting another object for the current object.
-      * @param thisArg The object to be used as the current object.
-      * @param argArray A list of arguments to be passed to the method.
-      */
-    call(this: Function, thisArg: any, ...argArray: any[]): any;
-
-    /**
-      * For a given function, creates a bound function that has the same body as the original function.
-      * The this object of the bound function is associated with the specified object, and has the specified initial parameters.
-      * @param thisArg An object to which the this keyword can refer inside the new function.
-      * @param argArray A list of arguments to be passed to the new function.
-      */
-    bind(this: Function, thisArg: any, ...argArray: any[]): any;
-
-    /** Returns a string representation of a function. */
-    toString(): string;
-
-    prototype: any;
-    readonly length: number;
-
-    // Non-standard extensions
-    arguments: any;
-    caller: Function;
-}
-
-interface FunctionConstructor {
-    /**
-      * Creates a new function.
-      * @param args A list of arguments the function accepts.
-      */
-    new(...args: string[]): Function;
-    (...args: string[]): Function;
-    readonly prototype: Function;
-}
-
-declare const Function: FunctionConstructor;
-
-interface IArguments {
-    [index: number]: any;
-    length: number;
-    callee: Function;
-}
-
-interface String {
-    /** Returns a string representation of a string. */
-    toString(): string;
-
-    /**
-      * Returns the character at the specified index.
-      * @param pos The zero-based index of the desired character.
-      */
-    charAt(pos: number): string;
-
-    /**
-      * Returns the Unicode value of the character at the specified location.
-      * @param index The zero-based index of the desired character. If there is no character at the specified index, NaN is returned.
-      */
-    charCodeAt(index: number): number;
-
-    /**
-      * Returns a string that contains the concatenation of two or more strings.
-      * @param strings The strings to append to the end of the string.
-      */
-    concat(...strings: string[]): string;
-
-    /**
-      * Returns the position of the first occurrence of a substring.
-      * @param searchString The substring to search for in the string
-      * @param position The index at which to begin searching the String object. If omitted, search starts at the beginning of the string.
-      */
-    indexOf(searchString: string, position?: number): number;
-
-    /**
-      * Returns the last occurrence of a substring in the string.
-      * @param searchString The substring to search for.
-      * @param position The index at which to begin searching. If omitted, the search begins at the end of the string.
-      */
-    lastIndexOf(searchString: string, position?: number): number;
-
-    /**
-      * Determines whether two strings are equivalent in the current locale.
-      * @param that String to compare to target string
-      */
-    localeCompare(that: string): number;
-
-    /**
-      * Matches a string with a regular expression, and returns an array containing the results of that search.
-      * @param regexp A variable name or string literal containing the regular expression pattern and flags.
-      */
-    match(regexp: string | RegExp): RegExpMatchArray | null;
-
-    /**
-      * Replaces text in a string, using a regular expression or search string.
-      * @param searchValue A string to search for.
-      * @param replaceValue A string containing the text to replace for every successful match of searchValue in this string.
-      */
-    replace(searchValue: string | RegExp, replaceValue: string): string;
-
-    /**
-      * Replaces text in a string, using a regular expression or search string.
-      * @param searchValue A string to search for.
-      * @param replacer A function that returns the replacement text.
-      */
-    replace(searchValue: string | RegExp, replacer: (substring: string, ...args: any[]) => string): string;
-
-    /**
-      * Finds the first substring match in a regular expression search.
-      * @param regexp The regular expression pattern and applicable flags.
-      */
-    search(regexp: string | RegExp): number;
-
-    /**
-      * Returns a section of a string.
-      * @param start The index to the beginning of the specified portion of stringObj.
-      * @param end The index to the end of the specified portion of stringObj. The substring includes the characters up to, but not including, the character indicated by end.
-      * If this value is not specified, the substring continues to the end of stringObj.
-      */
-    slice(start?: number, end?: number): string;
-
-    /**
-      * Split a string into substrings using the specified separator and return them as an array.
-      * @param separator A string that identifies character or characters to use in separating the string. If omitted, a single-element array containing the entire string is returned.
-      * @param limit A value used to limit the number of elements returned in the array.
-      */
-    split(separator: string | RegExp, limit?: number): string[];
-
-    /**
-      * Returns the substring at the specified location within a String object.
-      * @param start The zero-based index number indicating the beginning of the substring.
-      * @param end Zero-based index number indicating the end of the substring. The substring includes the characters up to, but not including, the character indicated by end.
-      * If end is omitted, the characters from start through the end of the original string are returned.
-      */
-    substring(start: number, end?: number): string;
-
-    /** Converts all the alphabetic characters in a string to lowercase. */
-    toLowerCase(): string;
-
-    /** Converts all alphabetic characters to lowercase, taking into account the host environment's current locale. */
-    toLocaleLowerCase(): string;
-
-    /** Converts all the alphabetic characters in a string to uppercase. */
-    toUpperCase(): string;
-
-    /** Returns a string where all alphabetic characters have been converted to uppercase, taking into account the host environment's current locale. */
-    toLocaleUpperCase(): string;
-
-    /** Removes the leading and trailing white space and line terminator characters from a string. */
-    trim(): string;
-
-    /** Returns the length of a String object. */
-    readonly length: number;
-
-    // IE extensions
-    /**
-      * Gets a substring beginning at the specified location and having the specified length.
-      * @param from The starting position of the desired substring. The index of the first character in the string is zero.
-      * @param length The number of characters to include in the returned substring.
-      */
-    substr(from: number, length?: number): string;
-
-    /** Returns the primitive value of the specified object. */
-    valueOf(): string;
-
-    readonly [index: number]: string;
-}
-
-interface StringConstructor {
-    new(value?: any): String;
-    (value?: any): string;
-    readonly prototype: String;
-    fromCharCode(...codes: number[]): string;
-}
-
-/**
-  * Allows manipulation and formatting of text strings and determination and location of substrings within strings.
-  */
-declare const String: StringConstructor;
-
-interface Boolean {
-    /** Returns the primitive value of the specified object. */
-    valueOf(): boolean;
-}
-
-interface BooleanConstructor {
-    new(value?: any): Boolean;
-    (value?: any): boolean;
-    readonly prototype: Boolean;
-}
-
-declare const Boolean: BooleanConstructor;
-
-interface Number {
-    /**
-      * Returns a string representation of an object.
-      * @param radix Specifies a radix for converting numeric values to strings. This value is only used for numbers.
-      */
-    toString(radix?: number): string;
-
-    /**
-      * Returns a string representing a number in fixed-point notation.
-      * @param fractionDigits Number of digits after the decimal point. Must be in the range 0 - 20, inclusive.
-      */
-    toFixed(fractionDigits?: number): string;
-
-    /**
-      * Returns a string containing a number represented in exponential notation.
-      * @param fractionDigits Number of digits after the decimal point. Must be in the range 0 - 20, inclusive.
-      */
-    toExponential(fractionDigits?: number): string;
-
-    /**
-      * Returns a string containing a number represented either in exponential or fixed-point notation with a specified number of digits.
-      * @param precision Number of significant digits. Must be in the range 1 - 21, inclusive.
-      */
-    toPrecision(precision?: number): string;
-
-    /** Returns the primitive value of the specified object. */
-    valueOf(): number;
-}
-
-interface NumberConstructor {
-    new(value?: any): Number;
-    (value?: any): number;
-    readonly prototype: Number;
-
-    /** The largest number that can be represented in JavaScript. Equal to approximately 1.79E+308. */
-    readonly MAX_VALUE: number;
-
-    /** The closest number to zero that can be represented in JavaScript. Equal to approximately 5.00E-324. */
-    readonly MIN_VALUE: number;
-
-    /**
-      * A value that is not a number.
-      * In equality comparisons, NaN does not equal any value, including itself. To test whether a value is equivalent to NaN, use the isNaN function.
-      */
-    readonly NaN: number;
-
-    /**
-      * A value that is less than the largest negative number that can be represented in JavaScript.
-      * JavaScript displays NEGATIVE_INFINITY values as -infinity.
-      */
-    readonly NEGATIVE_INFINITY: number;
-
-    /**
-      * A value greater than the largest number that can be represented in JavaScript.
-      * JavaScript displays POSITIVE_INFINITY values as infinity.
-      */
-    readonly POSITIVE_INFINITY: number;
-}
-
-/** An object that represents a number of any kind. All JavaScript numbers are 64-bit floating-point numbers. */
-declare const Number: NumberConstructor;
-
-interface TemplateStringsArray extends ReadonlyArray<string> {
-    readonly raw: ReadonlyArray<string>;
-}
-
-/**
- * The type of `import.meta`.
- * 
- * If you need to declare that a given property exists on `import.meta`,
- * this type may be augmented via interface merging.
- */
-interface ImportMeta {
-}
-
-interface Math {
-    /** The mathematical constant e. This is Euler's number, the base of natural logarithms. */
-    readonly E: number;
-    /** The natural logarithm of 10. */
-    readonly LN10: number;
-    /** The natural logarithm of 2. */
-    readonly LN2: number;
-    /** The base-2 logarithm of e. */
-    readonly LOG2E: number;
-    /** The base-10 logarithm of e. */
-    readonly LOG10E: number;
-    /** Pi. This is the ratio of the circumference of a circle to its diameter. */
-    readonly PI: number;
-    /** The square root of 0.5, or, equivalently, one divided by the square root of 2. */
-    readonly SQRT1_2: number;
-    /** The square root of 2. */
-    readonly SQRT2: number;
-    /**
-      * Returns the absolute value of a number (the value without regard to whether it is positive or negative).
-      * For example, the absolute value of -5 is the same as the absolute value of 5.
-      * @param x A numeric expression for which the absolute value is needed.
-      */
-    abs(x: number): number;
-    /**
-      * Returns the arc cosine (or inverse cosine) of a number.
-      * @param x A numeric expression.
-      */
-    acos(x: number): number;
-    /**
-      * Returns the arcsine of a number.
-      * @param x A numeric expression.
-      */
-    asin(x: number): number;
-    /**
-      * Returns the arctangent of a number.
-      * @param x A numeric expression for which the arctangent is needed.
-      */
-    atan(x: number): number;
-    /**
-      * Returns the angle (in radians) from the X axis to a point.
-      * @param y A numeric expression representing the cartesian y-coordinate.
-      * @param x A numeric expression representing the cartesian x-coordinate.
-      */
-    atan2(y: number, x: number): number;
-    /**
-      * Returns the smallest integer greater than or equal to its numeric argument.
-      * @param x A numeric expression.
-      */
-    ceil(x: number): number;
-    /**
-      * Returns the cosine of a number.
-      * @param x A numeric expression that contains an angle measured in radians.
-      */
-    cos(x: number): number;
-    /**
-      * Returns e (the base of natural logarithms) raised to a power.
-      * @param x A numeric expression representing the power of e.
-      */
-    exp(x: number): number;
-    /**
-      * Returns the greatest integer less than or equal to its numeric argument.
-      * @param x A numeric expression.
-      */
-    floor(x: number): number;
-    /**
-      * Returns the natural logarithm (base e) of a number.
-      * @param x A numeric expression.
-      */
-    log(x: number): number;
-    /**
-      * Returns the larger of a set of supplied numeric expressions.
-      * @param values Numeric expressions to be evaluated.
-      */
-    max(...values: number[]): number;
-    /**
-      * Returns the smaller of a set of supplied numeric expressions.
-      * @param values Numeric expressions to be evaluated.
-      */
-    min(...values: number[]): number;
-    /**
-      * Returns the value of a base expression taken to a specified power.
-      * @param x The base value of the expression.
-      * @param y The exponent value of the expression.
-      */
-    pow(x: number, y: number): number;
-    /** Returns a pseudorandom number between 0 and 1. */
-    random(): number;
-    /**
-      * Returns a supplied numeric expression rounded to the nearest number.
-      * @param x The value to be rounded to the nearest number.
-      */
-    round(x: number): number;
-    /**
-      * Returns the sine of a number.
-      * @param x A numeric expression that contains an angle measured in radians.
-      */
-    sin(x: number): number;
-    /**
-      * Returns the square root of a number.
-      * @param x A numeric expression.
-      */
-    sqrt(x: number): number;
-    /**
-      * Returns the tangent of a number.
-      * @param x A numeric expression that contains an angle measured in radians.
-      */
-    tan(x: number): number;
-}
-/** An intrinsic object that provides basic mathematics functionality and constants. */
-declare const Math: Math;
-
-/** Enables basic storage and retrieval of dates and times. */
-interface Date {
-    /** Returns a string representation of a date. The format of the string depends on the locale. */
-    toString(): string;
-    /** Returns a date as a string value. */
-    toDateString(): string;
-    /** Returns a time as a string value. */
-    toTimeString(): string;
-    /** Returns a value as a string value appropriate to the host environment's current locale. */
-    toLocaleString(): string;
-    /** Returns a date as a string value appropriate to the host environment's current locale. */
-    toLocaleDateString(): string;
-    /** Returns a time as a string value appropriate to the host environment's current locale. */
-    toLocaleTimeString(): string;
-    /** Returns the stored time value in milliseconds since midnight, January 1, 1970 UTC. */
-    valueOf(): number;
-    /** Gets the time value in milliseconds. */
-    getTime(): number;
-    /** Gets the year, using local time. */
-    getFullYear(): number;
-    /** Gets the year using Universal Coordinated Time (UTC). */
-    getUTCFullYear(): number;
-    /** Gets the month, using local time. */
-    getMonth(): number;
-    /** Gets the month of a Date object using Universal Coordinated Time (UTC). */
-    getUTCMonth(): number;
-    /** Gets the day-of-the-month, using local time. */
-    getDate(): number;
-    /** Gets the day-of-the-month, using Universal Coordinated Time (UTC). */
-    getUTCDate(): number;
-    /** Gets the day of the week, using local time. */
-    getDay(): number;
-    /** Gets the day of the week using Universal Coordinated Time (UTC). */
-    getUTCDay(): number;
-    /** Gets the hours in a date, using local time. */
-    getHours(): number;
-    /** Gets the hours value in a Date object using Universal Coordinated Time (UTC). */
-    getUTCHours(): number;
-    /** Gets the minutes of a Date object, using local time. */
-    getMinutes(): number;
-    /** Gets the minutes of a Date object using Universal Coordinated Time (UTC). */
-    getUTCMinutes(): number;
-    /** Gets the seconds of a Date object, using local time. */
-    getSeconds(): number;
-    /** Gets the seconds of a Date object using Universal Coordinated Time (UTC). */
-    getUTCSeconds(): number;
-    /** Gets the milliseconds of a Date, using local time. */
-    getMilliseconds(): number;
-    /** Gets the milliseconds of a Date object using Universal Coordinated Time (UTC). */
-    getUTCMilliseconds(): number;
-    /** Gets the difference in minutes between the time on the local computer and Universal Coordinated Time (UTC). */
-    getTimezoneOffset(): number;
-    /**
-      * Sets the date and time value in the Date object.
-      * @param time A numeric value representing the number of elapsed milliseconds since midnight, January 1, 1970 GMT.
-      */
-    setTime(time: number): number;
-    /**
-      * Sets the milliseconds value in the Date object using local time.
-      * @param ms A numeric value equal to the millisecond value.
-      */
-    setMilliseconds(ms: number): number;
-    /**
-      * Sets the milliseconds value in the Date object using Universal Coordinated Time (UTC).
-      * @param ms A numeric value equal to the millisecond value.
-      */
-    setUTCMilliseconds(ms: number): number;
-
-    /**
-      * Sets the seconds value in the Date object using local time.
-      * @param sec A numeric value equal to the seconds value.
-      * @param ms A numeric value equal to the milliseconds value.
-      */
-    setSeconds(sec: number, ms?: number): number;
-    /**
-      * Sets the seconds value in the Date object using Universal Coordinated Time (UTC).
-      * @param sec A numeric value equal to the seconds value.
-      * @param ms A numeric value equal to the milliseconds value.
-      */
-    setUTCSeconds(sec: number, ms?: number): number;
-    /**
-      * Sets the minutes value in the Date object using local time.
-      * @param min A numeric value equal to the minutes value.
-      * @param sec A numeric value equal to the seconds value.
-      * @param ms A numeric value equal to the milliseconds value.
-      */
-    setMinutes(min: number, sec?: number, ms?: number): number;
-    /**
-      * Sets the minutes value in the Date object using Universal Coordinated Time (UTC).
-      * @param min A numeric value equal to the minutes value.
-      * @param sec A numeric value equal to the seconds value.
-      * @param ms A numeric value equal to the milliseconds value.
-      */
-    setUTCMinutes(min: number, sec?: number, ms?: number): number;
-    /**
-      * Sets the hour value in the Date object using local time.
-      * @param hours A numeric value equal to the hours value.
-      * @param min A numeric value equal to the minutes value.
-      * @param sec A numeric value equal to the seconds value.
-      * @param ms A numeric value equal to the milliseconds value.
-      */
-    setHours(hours: number, min?: number, sec?: number, ms?: number): number;
-    /**
-      * Sets the hours value in the Date object using Universal Coordinated Time (UTC).
-      * @param hours A numeric value equal to the hours value.
-      * @param min A numeric value equal to the minutes value.
-      * @param sec A numeric value equal to the seconds value.
-      * @param ms A numeric value equal to the milliseconds value.
-      */
-    setUTCHours(hours: number, min?: number, sec?: number, ms?: number): number;
-    /**
-      * Sets the numeric day-of-the-month value of the Date object using local time.
-      * @param date A numeric value equal to the day of the month.
-      */
-    setDate(date: number): number;
-    /**
-      * Sets the numeric day of the month in the Date object using Universal Coordinated Time (UTC).
-      * @param date A numeric value equal to the day of the month.
-      */
-    setUTCDate(date: number): number;
-    /**
-      * Sets the month value in the Date object using local time.
-      * @param month A numeric value equal to the month. The value for January is 0, and other month values follow consecutively.
-      * @param date A numeric value representing the day of the month. If this value is not supplied, the value from a call to the getDate method is used.
-      */
-    setMonth(month: number, date?: number): number;
-    /**
-      * Sets the month value in the Date object using Universal Coordinated Time (UTC).
-      * @param month A numeric value equal to the month. The value for January is 0, and other month values follow consecutively.
-      * @param date A numeric value representing the day of the month. If it is not supplied, the value from a call to the getUTCDate method is used.
-      */
-    setUTCMonth(month: number, date?: number): number;
-    /**
-      * Sets the year of the Date object using local time.
-      * @param year A numeric value for the year.
-      * @param month A zero-based numeric value for the month (0 for January, 11 for December). Must be specified if numDate is specified.
-      * @param date A numeric value equal for the day of the month.
-      */
-    setFullYear(year: number, month?: number, date?: number): number;
-    /**
-      * Sets the year value in the Date object using Universal Coordinated Time (UTC).
-      * @param year A numeric value equal to the year.
-      * @param month A numeric value equal to the month. The value for January is 0, and other month values follow consecutively. Must be supplied if numDate is supplied.
-      * @param date A numeric value equal to the day of the month.
-      */
-    setUTCFullYear(year: number, month?: number, date?: number): number;
-    /** Returns a date converted to a string using Universal Coordinated Time (UTC). */
-    toUTCString(): string;
-    /** Returns a date as a string value in ISO format. */
-    toISOString(): string;
-    /** Used by the JSON.stringify method to enable the transformation of an object's data for JavaScript Object Notation (JSON) serialization. */
-    toJSON(key?: any): string;
-}
-
-interface DateConstructor {
-    new(): Date;
-    new(value: number | string): Date;
-    new(year: number, month: number, date?: number, hours?: number, minutes?: number, seconds?: number, ms?: number): Date;
-    (): string;
-    readonly prototype: Date;
-    /**
-      * Parses a string containing a date, and returns the number of milliseconds between that date and midnight, January 1, 1970.
-      * @param s A date string
-      */
-    parse(s: string): number;
-    /**
-      * Returns the number of milliseconds between midnight, January 1, 1970 Universal Coordinated Time (UTC) (or GMT) and the specified date.
-      * @param year The full year designation is required for cross-century date accuracy. If year is between 0 and 99 is used, then year is assumed to be 1900 + year.
-      * @param month The month as an number between 0 and 11 (January to December).
-      * @param date The date as an number between 1 and 31.
-      * @param hours Must be supplied if minutes is supplied. An number from 0 to 23 (midnight to 11pm) that specifies the hour.
-      * @param minutes Must be supplied if seconds is supplied. An number from 0 to 59 that specifies the minutes.
-      * @param seconds Must be supplied if milliseconds is supplied. An number from 0 to 59 that specifies the seconds.
-      * @param ms An number from 0 to 999 that specifies the milliseconds.
-      */
-    UTC(year: number, month: number, date?: number, hours?: number, minutes?: number, seconds?: number, ms?: number): number;
-    now(): number;
-}
-
-declare const Date: DateConstructor;
-
-interface RegExpMatchArray extends Array<string> {
-    index?: number;
-    input?: string;
-}
-
-interface RegExpExecArray extends Array<string> {
-    index: number;
-    input: string;
-}
-
-interface RegExp {
-    /**
-      * Executes a search on a string using a regular expression pattern, and returns an array containing the results of that search.
-      * @param string The String object or string literal on which to perform the search.
-      */
-    exec(string: string): RegExpExecArray | null;
-
-    /**
-      * Returns a Boolean value that indicates whether or not a pattern exists in a searched string.
-      * @param string String on which to perform the search.
-      */
-    test(string: string): boolean;
-
-    /** Returns a copy of the text of the regular expression pattern. Read-only. The regExp argument is a Regular expression object. It can be a variable name or a literal. */
-    readonly source: string;
-
-    /** Returns a Boolean value indicating the state of the global flag (g) used with a regular expression. Default is false. Read-only. */
-    readonly global: boolean;
-
-    /** Returns a Boolean value indicating the state of the ignoreCase flag (i) used with a regular expression. Default is false. Read-only. */
-    readonly ignoreCase: boolean;
-
-    /** Returns a Boolean value indicating the state of the multiline flag (m) used with a regular expression. Default is false. Read-only. */
-    readonly multiline: boolean;
-
-    lastIndex: number;
-
-    // Non-standard extensions
-    compile(): this;
-}
-
-interface RegExpConstructor {
-    new(pattern: RegExp | string): RegExp;
-    new(pattern: string, flags?: string): RegExp;
-    (pattern: RegExp | string): RegExp;
-    (pattern: string, flags?: string): RegExp;
-    readonly prototype: RegExp;
-
-    // Non-standard extensions
-    $1: string;
-    $2: string;
-    $3: string;
-    $4: string;
-    $5: string;
-    $6: string;
-    $7: string;
-    $8: string;
-    $9: string;
-    lastMatch: string;
-}
-
-declare const RegExp: RegExpConstructor;
-
-interface Error {
-    name: string;
-    message: string;
-    stack?: string;
-}
-
-interface ErrorConstructor {
-    new(message?: string): Error;
-    (message?: string): Error;
-    readonly prototype: Error;
-}
-
-declare const Error: ErrorConstructor;
-
-interface EvalError extends Error {
-}
-
-interface EvalErrorConstructor {
-    new(message?: string): EvalError;
-    (message?: string): EvalError;
-    readonly prototype: EvalError;
-}
-
-declare const EvalError: EvalErrorConstructor;
-
-interface RangeError extends Error {
-}
-
-interface RangeErrorConstructor {
-    new(message?: string): RangeError;
-    (message?: string): RangeError;
-    readonly prototype: RangeError;
-}
-
-declare const RangeError: RangeErrorConstructor;
-
-interface ReferenceError extends Error {
-}
-
-interface ReferenceErrorConstructor {
-    new(message?: string): ReferenceError;
-    (message?: string): ReferenceError;
-    readonly prototype: ReferenceError;
-}
-
-declare const ReferenceError: ReferenceErrorConstructor;
-
-interface SyntaxError extends Error {
-}
-
-interface SyntaxErrorConstructor {
-    new(message?: string): SyntaxError;
-    (message?: string): SyntaxError;
-    readonly prototype: SyntaxError;
-}
-
-declare const SyntaxError: SyntaxErrorConstructor;
-
-interface TypeError extends Error {
-}
-
-interface TypeErrorConstructor {
-    new(message?: string): TypeError;
-    (message?: string): TypeError;
-    readonly prototype: TypeError;
-}
-
-declare const TypeError: TypeErrorConstructor;
-
-interface URIError extends Error {
-}
-
-interface URIErrorConstructor {
-    new(message?: string): URIError;
-    (message?: string): URIError;
-    readonly prototype: URIError;
-}
-
-declare const URIError: URIErrorConstructor;
-
-interface JSON {
-    /**
-      * Converts a JavaScript Object Notation (JSON) string into an object.
-      * @param text A valid JSON string.
-      * @param reviver A function that transforms the results. This function is called for each member of the object.
-      * If a member contains nested objects, the nested objects are transformed before the parent object is.
-      */
-    parse(text: string, reviver?: (key: any, value: any) => any): any;
-    /**
-      * Converts a JavaScript value to a JavaScript Object Notation (JSON) string.
-      * @param value A JavaScript value, usually an object or array, to be converted.
-      * @param replacer A function that transforms the results.
-      * @param space Adds indentation, white space, and line break characters to the return-value JSON text to make it easier to read.
-      */
-    stringify(value: any, replacer?: (key: string, value: any) => any, space?: string | number): string;
-    /**
-      * Converts a JavaScript value to a JavaScript Object Notation (JSON) string.
-      * @param value A JavaScript value, usually an object or array, to be converted.
-      * @param replacer An array of strings and numbers that acts as a approved list for selecting the object properties that will be stringified.
-      * @param space Adds indentation, white space, and line break characters to the return-value JSON text to make it easier to read.
-      */
-    stringify(value: any, replacer?: (number | string)[] | null, space?: string | number): string;
-}
-
-/**
-  * An intrinsic object that provides functions to convert JavaScript values to and from the JavaScript Object Notation (JSON) format.
-  */
-declare const JSON: JSON;
-
-
-/////////////////////////////
-/// ECMAScript Array API (specially handled by compiler)
-/////////////////////////////
-
-interface ReadonlyArray<T> {
-    /**
-      * Gets the length of the array. This is a number one higher than the highest element defined in an array.
-      */
-    readonly length: number;
-    /**
-      * Returns a string representation of an array.
-      */
-    toString(): string;
-    /**
-      * Returns a string representation of an array. The elements are converted to string using their toLocalString methods.
-      */
-    toLocaleString(): string;
-    /**
-      * Combines two or more arrays.
-      * @param items Additional items to add to the end of array1.
-      */
-    concat(...items: ConcatArray<T>[]): T[];
-    /**
-      * Combines two or more arrays.
-      * @param items Additional items to add to the end of array1.
-      */
-    concat(...items: (T | ConcatArray<T>)[]): T[];
-    /**
-      * Adds all the elements of an array separated by the specified separator string.
-      * @param separator A string used to separate one element of an array from the next in the resulting String. If omitted, the array elements are separated with a comma.
-      */
-    join(separator?: string): string;
-    /**
-      * Returns a section of an array.
-      * @param start The beginning of the specified portion of the array.
-      * @param end The end of the specified portion of the array.
-      */
-    slice(start?: number, end?: number): T[];
-    /**
-      * Returns the index of the first occurrence of a value in an array.
-      * @param searchElement The value to locate in the array.
-      * @param fromIndex The array index at which to begin the search. If fromIndex is omitted, the search starts at index 0.
-      */
-    indexOf(searchElement: T, fromIndex?: number): number;
-    /**
-      * Returns the index of the last occurrence of a specified value in an array.
-      * @param searchElement The value to locate in the array.
-      * @param fromIndex The array index at which to begin the search. If fromIndex is omitted, the search starts at the last index in the array.
-      */
-    lastIndexOf(searchElement: T, fromIndex?: number): number;
-    /**
-      * Determines whether all the members of an array satisfy the specified test.
-      * @param callbackfn A function that accepts up to three arguments. The every method calls the callbackfn function for each element in array1 until the callbackfn returns false, or until the end of the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
-      */
-    every(callbackfn: (value: T, index: number, array: ReadonlyArray<T>) => boolean, thisArg?: any): boolean;
-    /**
-      * Determines whether the specified callback function returns true for any element of an array.
-      * @param callbackfn A function that accepts up to three arguments. The some method calls the callbackfn function for each element in array1 until the callbackfn returns true, or until the end of the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
-      */
-    some(callbackfn: (value: T, index: number, array: ReadonlyArray<T>) => boolean, thisArg?: any): boolean;
-    /**
-      * Performs the specified action for each element in an array.
-      * @param callbackfn  A function that accepts up to three arguments. forEach calls the callbackfn function one time for each element in the array.
-      * @param thisArg  An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
-      */
-    forEach(callbackfn: (value: T, index: number, array: ReadonlyArray<T>) => void, thisArg?: any): void;
-    /**
-      * Calls a defined callback function on each element of an array, and returns an array that contains the results.
-      * @param callbackfn A function that accepts up to three arguments. The map method calls the callbackfn function one time for each element in the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
-      */
-    map<U>(callbackfn: (value: T, index: number, array: ReadonlyArray<T>) => U, thisArg?: any): U[];
-    /**
-     * Returns the elements of an array that meet the condition specified in a callback function.
-     * @param callbackfn A function that accepts up to three arguments. The filter method calls the callbackfn function one time for each element in the array.
-     * @param thisArg An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
-     */
-    filter<S extends T>(callbackfn: (value: T, index: number, array: ReadonlyArray<T>) => value is S, thisArg?: any): S[];
-    /**
-      * Returns the elements of an array that meet the condition specified in a callback function.
-      * @param callbackfn A function that accepts up to three arguments. The filter method calls the callbackfn function one time for each element in the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
-      */
-    filter(callbackfn: (value: T, index: number, array: ReadonlyArray<T>) => any, thisArg?: any): T[];
-    /**
-      * Calls the specified callback function for all the elements in an array. The return value of the callback function is the accumulated result, and is provided as an argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduce method calls the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start the accumulation. The first call to the callbackfn function provides this value as an argument instead of an array value.
-      */
-    reduce(callbackfn: (previousValue: T, currentValue: T, currentIndex: number, array: ReadonlyArray<T>) => T): T;
-    reduce(callbackfn: (previousValue: T, currentValue: T, currentIndex: number, array: ReadonlyArray<T>) => T, initialValue: T): T;
-    /**
-      * Calls the specified callback function for all the elements in an array. The return value of the callback function is the accumulated result, and is provided as an argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduce method calls the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start the accumulation. The first call to the callbackfn function provides this value as an argument instead of an array value.
-      */
-    reduce<U>(callbackfn: (previousValue: U, currentValue: T, currentIndex: number, array: ReadonlyArray<T>) => U, initialValue: U): U;
-    /**
-      * Calls the specified callback function for all the elements in an array, in descending order. The return value of the callback function is the accumulated result, and is provided as an argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduceRight method calls the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start the accumulation. The first call to the callbackfn function provides this value as an argument instead of an array value.
-      */
-    reduceRight(callbackfn: (previousValue: T, currentValue: T, currentIndex: number, array: ReadonlyArray<T>) => T): T;
-    reduceRight(callbackfn: (previousValue: T, currentValue: T, currentIndex: number, array: ReadonlyArray<T>) => T, initialValue: T): T;
-    /**
-      * Calls the specified callback function for all the elements in an array, in descending order. The return value of the callback function is the accumulated result, and is provided as an argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduceRight method calls the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start the accumulation. The first call to the callbackfn function provides this value as an argument instead of an array value.
-      */
-    reduceRight<U>(callbackfn: (previousValue: U, currentValue: T, currentIndex: number, array: ReadonlyArray<T>) => U, initialValue: U): U;
-
-    readonly [n: number]: T;
-}
-
-interface ConcatArray<T> {
-    readonly length: number;
-    readonly [n: number]: T;
-    join(separator?: string): string;
-    slice(start?: number, end?: number): T[];
-}
-
-interface Array<T> {
-    /**
-      * Gets or sets the length of the array. This is a number one higher than the highest element defined in an array.
-      */
-    length: number;
-    /**
-      * Returns a string representation of an array.
-      */
-    toString(): string;
-    /**
-      * Returns a string representation of an array. The elements are converted to string using their toLocalString methods.
-      */
-    toLocaleString(): string;
-    /**
-      * Appends new elements to an array, and returns the new length of the array.
-      * @param items New elements of the Array.
-      */
-    push(...items: T[]): number;
-    /**
-      * Removes the last element from an array and returns it.
-      */
-    pop(): T | undefined;
-    /**
-      * Combines two or more arrays.
-      * @param items Additional items to add to the end of array1.
-      */
-    concat(...items: ConcatArray<T>[]): T[];
-    /**
-      * Combines two or more arrays.
-      * @param items Additional items to add to the end of array1.
-      */
-    concat(...items: (T | ConcatArray<T>)[]): T[];
-    /**
-      * Adds all the elements of an array separated by the specified separator string.
-      * @param separator A string used to separate one element of an array from the next in the resulting String. If omitted, the array elements are separated with a comma.
-      */
-    join(separator?: string): string;
-    /**
-      * Reverses the elements in an Array.
-      */
-    reverse(): T[];
-    /**
-      * Removes the first element from an array and returns it.
-      */
-    shift(): T | undefined;
-    /**
-      * Returns a section of an array.
-      * @param start The beginning of the specified portion of the array.
-      * @param end The end of the specified portion of the array.
-      */
-    slice(start?: number, end?: number): T[];
-    /**
-      * Sorts an array.
-      * @param compareFn The name of the function used to determine the order of the elements. If omitted, the elements are sorted in ascending, ASCII character order.
-      */
-    sort(compareFn?: (a: T, b: T) => number): this;
-    /**
-      * Removes elements from an array and, if necessary, inserts new elements in their place, returning the deleted elements.
-      * @param start The zero-based location in the array from which to start removing elements.
-      * @param deleteCount The number of elements to remove.
-      */
-    splice(start: number, deleteCount?: number): T[];
-    /**
-      * Removes elements from an array and, if necessary, inserts new elements in their place, returning the deleted elements.
-      * @param start The zero-based location in the array from which to start removing elements.
-      * @param deleteCount The number of elements to remove.
-      * @param items Elements to insert into the array in place of the deleted elements.
-      */
-    splice(start: number, deleteCount: number, ...items: T[]): T[];
-    /**
-      * Inserts new elements at the start of an array.
-      * @param items  Elements to insert at the start of the Array.
-      */
-    unshift(...items: T[]): number;
-    /**
-      * Returns the index of the first occurrence of a value in an array.
-      * @param searchElement The value to locate in the array.
-      * @param fromIndex The array index at which to begin the search. If fromIndex is omitted, the search starts at index 0.
-      */
-    indexOf(searchElement: T, fromIndex?: number): number;
-    /**
-      * Returns the index of the last occurrence of a specified value in an array.
-      * @param searchElement The value to locate in the array.
-      * @param fromIndex The array index at which to begin the search. If fromIndex is omitted, the search starts at the last index in the array.
-      */
-    lastIndexOf(searchElement: T, fromIndex?: number): number;
-    /**
-      * Determines whether all the members of an array satisfy the specified test.
-      * @param callbackfn A function that accepts up to three arguments. The every method calls the callbackfn function for each element in array1 until the callbackfn returns false, or until the end of the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
-      */
-    every(callbackfn: (value: T, index: number, array: T[]) => boolean, thisArg?: any): boolean;
-    /**
-      * Determines whether the specified callback function returns true for any element of an array.
-      * @param callbackfn A function that accepts up to three arguments. The some method calls the callbackfn function for each element in array1 until the callbackfn returns true, or until the end of the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
-      */
-    some(callbackfn: (value: T, index: number, array: T[]) => boolean, thisArg?: any): boolean;
-    /**
-      * Performs the specified action for each element in an array.
-      * @param callbackfn  A function that accepts up to three arguments. forEach calls the callbackfn function one time for each element in the array.
-      * @param thisArg  An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
-      */
-    forEach(callbackfn: (value: T, index: number, array: T[]) => void, thisArg?: any): void;
-    /**
-      * Calls a defined callback function on each element of an array, and returns an array that contains the results.
-      * @param callbackfn A function that accepts up to three arguments. The map method calls the callbackfn function one time for each element in the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
-      */
-    map<U>(callbackfn: (value: T, index: number, array: T[]) => U, thisArg?: any): U[];
-    /**
-     * Returns the elements of an array that meet the condition specified in a callback function.
-     * @param callbackfn A function that accepts up to three arguments. The filter method calls the callbackfn function one time for each element in the array.
-     * @param thisArg An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
-     */
-    filter<S extends T>(callbackfn: (value: T, index: number, array: T[]) => value is S, thisArg?: any): S[];
-    /**
-      * Returns the elements of an array that meet the condition specified in a callback function.
-      * @param callbackfn A function that accepts up to three arguments. The filter method calls the callbackfn function one time for each element in the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
-      */
-    filter(callbackfn: (value: T, index: number, array: T[]) => any, thisArg?: any): T[];
-    /**
-      * Calls the specified callback function for all the elements in an array. The return value of the callback function is the accumulated result, and is provided as an argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduce method calls the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start the accumulation. The first call to the callbackfn function provides this value as an argument instead of an array value.
-      */
-    reduce(callbackfn: (previousValue: T, currentValue: T, currentIndex: number, array: T[]) => T): T;
-    reduce(callbackfn: (previousValue: T, currentValue: T, currentIndex: number, array: T[]) => T, initialValue: T): T;
-    /**
-      * Calls the specified callback function for all the elements in an array. The return value of the callback function is the accumulated result, and is provided as an argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduce method calls the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start the accumulation. The first call to the callbackfn function provides this value as an argument instead of an array value.
-      */
-    reduce<U>(callbackfn: (previousValue: U, currentValue: T, currentIndex: number, array: T[]) => U, initialValue: U): U;
-    /**
-      * Calls the specified callback function for all the elements in an array, in descending order. The return value of the callback function is the accumulated result, and is provided as an argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduceRight method calls the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start the accumulation. The first call to the callbackfn function provides this value as an argument instead of an array value.
-      */
-    reduceRight(callbackfn: (previousValue: T, currentValue: T, currentIndex: number, array: T[]) => T): T;
-    reduceRight(callbackfn: (previousValue: T, currentValue: T, currentIndex: number, array: T[]) => T, initialValue: T): T;
-    /**
-      * Calls the specified callback function for all the elements in an array, in descending order. The return value of the callback function is the accumulated result, and is provided as an argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduceRight method calls the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start the accumulation. The first call to the callbackfn function provides this value as an argument instead of an array value.
-      */
-    reduceRight<U>(callbackfn: (previousValue: U, currentValue: T, currentIndex: number, array: T[]) => U, initialValue: U): U;
-
-    [n: number]: T;
-}
-
-interface ArrayConstructor {
-    new(arrayLength?: number): any[];
-    new <T>(arrayLength: number): T[];
-    new <T>(...items: T[]): T[];
-    (arrayLength?: number): any[];
-    <T>(arrayLength: number): T[];
-    <T>(...items: T[]): T[];
-    isArray(arg: any): arg is Array<any>;
-    readonly prototype: Array<any>;
-}
-
-declare const Array: ArrayConstructor;
-
-interface TypedPropertyDescriptor<T> {
-    enumerable?: boolean;
-    configurable?: boolean;
-    writable?: boolean;
-    value?: T;
-    get?: () => T;
-    set?: (value: T) => void;
-}
-
-declare type ClassDecorator = <TFunction extends Function>(target: TFunction) => TFunction | void;
-declare type PropertyDecorator = (target: Object, propertyKey: string | symbol) => void;
-declare type MethodDecorator = <T>(target: Object, propertyKey: string | symbol, descriptor: TypedPropertyDescriptor<T>) => TypedPropertyDescriptor<T> | void;
-declare type ParameterDecorator = (target: Object, propertyKey: string | symbol, parameterIndex: number) => void;
-
-declare type PromiseConstructorLike = new <T>(executor: (resolve: (value?: T | PromiseLike<T>) => void, reject: (reason?: any) => void) => void) => PromiseLike<T>;
-
-interface PromiseLike<T> {
-    /**
-     * Attaches callbacks for the resolution and/or rejection of the Promise.
-     * @param onfulfilled The callback to execute when the Promise is resolved.
-     * @param onrejected The callback to execute when the Promise is rejected.
-     * @returns A Promise for the completion of which ever callback is executed.
-     */
-    then<TResult1 = T, TResult2 = never>(onfulfilled?: ((value: T) => TResult1 | PromiseLike<TResult1>) | undefined | null, onrejected?: ((reason: any) => TResult2 | PromiseLike<TResult2>) | undefined | null): PromiseLike<TResult1 | TResult2>;
-}
-
-/**
- * Represents the completion of an asynchronous operation
- */
-interface Promise<T> {
-    /**
-     * Attaches callbacks for the resolution and/or rejection of the Promise.
-     * @param onfulfilled The callback to execute when the Promise is resolved.
-     * @param onrejected The callback to execute when the Promise is rejected.
-     * @returns A Promise for the completion of which ever callback is executed.
-     */
-    then<TResult1 = T, TResult2 = never>(onfulfilled?: ((value: T) => TResult1 | PromiseLike<TResult1>) | undefined | null, onrejected?: ((reason: any) => TResult2 | PromiseLike<TResult2>) | undefined | null): Promise<TResult1 | TResult2>;
-
-    /**
-     * Attaches a callback for only the rejection of the Promise.
-     * @param onrejected The callback to execute when the Promise is rejected.
-     * @returns A Promise for the completion of the callback.
-     */
-    catch<TResult = never>(onrejected?: ((reason: any) => TResult | PromiseLike<TResult>) | undefined | null): Promise<T | TResult>;
-}
-
-interface ArrayLike<T> {
-    readonly length: number;
-    readonly [n: number]: T;
-}
-
-/**
- * Make all properties in T optional
- */
-type Partial<T> = {
-    [P in keyof T]?: T[P];
-};
-
-/**
- * Make all properties in T required
- */
-type Required<T> = {
-    [P in keyof T]-?: T[P];
-};
-
-/**
- * Make all properties in T readonly
- */
-type Readonly<T> = {
-    readonly [P in keyof T]: T[P];
-};
-
-/**
- * From T pick a set of properties K
- */
-type Pick<T, K extends keyof T> = {
-    [P in K]: T[P];
-};
-
-/**
- * Construct a type with a set of properties K of type T
- */
-type Record<K extends keyof any, T> = {
-    [P in K]: T;
-};
-
-/**
- * Exclude from T those types that are assignable to U
- */
-type Exclude<T, U> = T extends U ? never : T;
-
-/**
- * Extract from T those types that are assignable to U
- */
-type Extract<T, U> = T extends U ? T : never;
-
-/**
- * Exclude null and undefined from T
- */
-type NonNullable<T> = T extends null | undefined ? never : T;
-
-/**
- * Obtain the return type of a function type
- */
-type ReturnType<T extends (...args: any[]) => any> = T extends (...args: any[]) => infer R ? R : any;
-
-/**
- * Obtain the return type of a constructor function type
- */
-type InstanceType<T extends new (...args: any[]) => any> = T extends new (...args: any[]) => infer R ? R : any;
-
-/**
- * Marker for contextual 'this' type
- */
-interface ThisType<T> { }
-
-/**
-  * Represents a raw buffer of binary data, which is used to store data for the
-  * different typed arrays. ArrayBuffers cannot be read from or written to directly,
-  * but can be passed to a typed array or DataView Object to interpret the raw
-  * buffer as needed.
-  */
-interface ArrayBuffer {
-    /**
-      * Read-only. The length of the ArrayBuffer (in bytes).
-      */
-    readonly byteLength: number;
-
-    /**
-      * Returns a section of an ArrayBuffer.
-      */
-    slice(begin: number, end?: number): ArrayBuffer;
-}
-
-/**
- * Allowed ArrayBuffer types for the buffer of an ArrayBufferView and related Typed Arrays.
- */
-interface ArrayBufferTypes {
-    ArrayBuffer: ArrayBuffer;
-}
-type ArrayBufferLike = ArrayBufferTypes[keyof ArrayBufferTypes];
-
-interface ArrayBufferConstructor {
-    readonly prototype: ArrayBuffer;
-    new(byteLength: number): ArrayBuffer;
-    isView(arg: any): arg is ArrayBufferView;
-}
-declare const ArrayBuffer: ArrayBufferConstructor;
-
-interface ArrayBufferView {
-    /**
-      * The ArrayBuffer instance referenced by the array.
-      */
-    buffer: ArrayBufferLike;
-
-    /**
-      * The length in bytes of the array.
-      */
-    byteLength: number;
-
-    /**
-      * The offset in bytes of the array.
-      */
-    byteOffset: number;
-}
-
-interface DataView {
-    readonly buffer: ArrayBuffer;
-    readonly byteLength: number;
-    readonly byteOffset: number;
-    /**
-      * Gets the Float32 value at the specified byte offset from the start of the view. There is
-      * no alignment constraint; multi-byte values may be fetched from any offset.
-      * @param byteOffset The place in the buffer at which the value should be retrieved.
-      */
-    getFloat32(byteOffset: number, littleEndian?: boolean): number;
-
-    /**
-      * Gets the Float64 value at the specified byte offset from the start of the view. There is
-      * no alignment constraint; multi-byte values may be fetched from any offset.
-      * @param byteOffset The place in the buffer at which the value should be retrieved.
-      */
-    getFloat64(byteOffset: number, littleEndian?: boolean): number;
-
-    /**
-      * Gets the Int8 value at the specified byte offset from the start of the view. There is
-      * no alignment constraint; multi-byte values may be fetched from any offset.
-      * @param byteOffset The place in the buffer at which the value should be retrieved.
-      */
-    getInt8(byteOffset: number): number;
-
-    /**
-      * Gets the Int16 value at the specified byte offset from the start of the view. There is
-      * no alignment constraint; multi-byte values may be fetched from any offset.
-      * @param byteOffset The place in the buffer at which the value should be retrieved.
-      */
-    getInt16(byteOffset: number, littleEndian?: boolean): number;
-    /**
-      * Gets the Int32 value at the specified byte offset from the start of the view. There is
-      * no alignment constraint; multi-byte values may be fetched from any offset.
-      * @param byteOffset The place in the buffer at which the value should be retrieved.
-      */
-    getInt32(byteOffset: number, littleEndian?: boolean): number;
-
-    /**
-      * Gets the Uint8 value at the specified byte offset from the start of the view. There is
-      * no alignment constraint; multi-byte values may be fetched from any offset.
-      * @param byteOffset The place in the buffer at which the value should be retrieved.
-      */
-    getUint8(byteOffset: number): number;
-
-    /**
-      * Gets the Uint16 value at the specified byte offset from the start of the view. There is
-      * no alignment constraint; multi-byte values may be fetched from any offset.
-      * @param byteOffset The place in the buffer at which the value should be retrieved.
-      */
-    getUint16(byteOffset: number, littleEndian?: boolean): number;
-
-    /**
-      * Gets the Uint32 value at the specified byte offset from the start of the view. There is
-      * no alignment constraint; multi-byte values may be fetched from any offset.
-      * @param byteOffset The place in the buffer at which the value should be retrieved.
-      */
-    getUint32(byteOffset: number, littleEndian?: boolean): number;
-
-    /**
-      * Stores an Float32 value at the specified byte offset from the start of the view.
-      * @param byteOffset The place in the buffer at which the value should be set.
-      * @param value The value to set.
-      * @param littleEndian If false or undefined, a big-endian value should be written,
-      * otherwise a little-endian value should be written.
-      */
-    setFloat32(byteOffset: number, value: number, littleEndian?: boolean): void;
-
-    /**
-      * Stores an Float64 value at the specified byte offset from the start of the view.
-      * @param byteOffset The place in the buffer at which the value should be set.
-      * @param value The value to set.
-      * @param littleEndian If false or undefined, a big-endian value should be written,
-      * otherwise a little-endian value should be written.
-      */
-    setFloat64(byteOffset: number, value: number, littleEndian?: boolean): void;
-
-    /**
-      * Stores an Int8 value at the specified byte offset from the start of the view.
-      * @param byteOffset The place in the buffer at which the value should be set.
-      * @param value The value to set.
-      */
-    setInt8(byteOffset: number, value: number): void;
-
-    /**
-      * Stores an Int16 value at the specified byte offset from the start of the view.
-      * @param byteOffset The place in the buffer at which the value should be set.
-      * @param value The value to set.
-      * @param littleEndian If false or undefined, a big-endian value should be written,
-      * otherwise a little-endian value should be written.
-      */
-    setInt16(byteOffset: number, value: number, littleEndian?: boolean): void;
-
-    /**
-      * Stores an Int32 value at the specified byte offset from the start of the view.
-      * @param byteOffset The place in the buffer at which the value should be set.
-      * @param value The value to set.
-      * @param littleEndian If false or undefined, a big-endian value should be written,
-      * otherwise a little-endian value should be written.
-      */
-    setInt32(byteOffset: number, value: number, littleEndian?: boolean): void;
-
-    /**
-      * Stores an Uint8 value at the specified byte offset from the start of the view.
-      * @param byteOffset The place in the buffer at which the value should be set.
-      * @param value The value to set.
-      */
-    setUint8(byteOffset: number, value: number): void;
-
-    /**
-      * Stores an Uint16 value at the specified byte offset from the start of the view.
-      * @param byteOffset The place in the buffer at which the value should be set.
-      * @param value The value to set.
-      * @param littleEndian If false or undefined, a big-endian value should be written,
-      * otherwise a little-endian value should be written.
-      */
-    setUint16(byteOffset: number, value: number, littleEndian?: boolean): void;
-
-    /**
-      * Stores an Uint32 value at the specified byte offset from the start of the view.
-      * @param byteOffset The place in the buffer at which the value should be set.
-      * @param value The value to set.
-      * @param littleEndian If false or undefined, a big-endian value should be written,
-      * otherwise a little-endian value should be written.
-      */
-    setUint32(byteOffset: number, value: number, littleEndian?: boolean): void;
-}
-
-interface DataViewConstructor {
-    new(buffer: ArrayBufferLike, byteOffset?: number, byteLength?: number): DataView;
-}
-declare const DataView: DataViewConstructor;
-
-/**
-  * A typed array of 8-bit integer values. The contents are initialized to 0. If the requested
-  * number of bytes could not be allocated an exception is raised.
-  */
-interface Int8Array {
-    /**
-      * The size in bytes of each element in the array.
-      */
-    readonly BYTES_PER_ELEMENT: number;
-
-    /**
-      * The ArrayBuffer instance referenced by the array.
-      */
-    readonly buffer: ArrayBufferLike;
-
-    /**
-      * The length in bytes of the array.
-      */
-    readonly byteLength: number;
-
-    /**
-      * The offset in bytes of the array.
-      */
-    readonly byteOffset: number;
-
-    /**
-      * Returns the this object after copying a section of the array identified by start and end
-      * to the same array starting at position target
-      * @param target If target is negative, it is treated as length+target where length is the
-      * length of the array.
-      * @param start If start is negative, it is treated as length+start. If end is negative, it
-      * is treated as length+end.
-      * @param end If not specified, length of the this object is used as its default value.
-      */
-    copyWithin(target: number, start: number, end?: number): this;
-
-    /**
-      * Determines whether all the members of an array satisfy the specified test.
-      * @param callbackfn A function that accepts up to three arguments. The every method calls
-      * the callbackfn function for each element in array1 until the callbackfn returns false,
-      * or until the end of the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    every(callbackfn: (value: number, index: number, array: Int8Array) => boolean, thisArg?: any): boolean;
-
-    /**
-        * Returns the this object after filling the section identified by start and end with value
-        * @param value value to fill array section with
-        * @param start index to start filling the array at. If start is negative, it is treated as
-        * length+start where length is the length of the array.
-        * @param end index to stop filling the array at. If end is negative, it is treated as
-        * length+end.
-        */
-    fill(value: number, start?: number, end?: number): this;
-
-    /**
-      * Returns the elements of an array that meet the condition specified in a callback function.
-      * @param callbackfn A function that accepts up to three arguments. The filter method calls
-      * the callbackfn function one time for each element in the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    filter(callbackfn: (value: number, index: number, array: Int8Array) => any, thisArg?: any): Int8Array;
-
-    /**
-      * Returns the value of the first element in the array where predicate is true, and undefined
-      * otherwise.
-      * @param predicate find calls predicate once for each element of the array, in ascending
-      * order, until it finds one where predicate returns true. If such an element is found, find
-      * immediately returns that element value. Otherwise, find returns undefined.
-      * @param thisArg If provided, it will be used as the this value for each invocation of
-      * predicate. If it is not provided, undefined is used instead.
-      */
-    find(predicate: (value: number, index: number, obj: Int8Array) => boolean, thisArg?: any): number | undefined;
-
-    /**
-      * Returns the index of the first element in the array where predicate is true, and -1
-      * otherwise.
-      * @param predicate find calls predicate once for each element of the array, in ascending
-      * order, until it finds one where predicate returns true. If such an element is found,
-      * findIndex immediately returns that element index. Otherwise, findIndex returns -1.
-      * @param thisArg If provided, it will be used as the this value for each invocation of
-      * predicate. If it is not provided, undefined is used instead.
-      */
-    findIndex(predicate: (value: number, index: number, obj: Int8Array) => boolean, thisArg?: any): number;
-
-    /**
-      * Performs the specified action for each element in an array.
-      * @param callbackfn  A function that accepts up to three arguments. forEach calls the
-      * callbackfn function one time for each element in the array.
-      * @param thisArg  An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    forEach(callbackfn: (value: number, index: number, array: Int8Array) => void, thisArg?: any): void;
-
-    /**
-      * Returns the index of the first occurrence of a value in an array.
-      * @param searchElement The value to locate in the array.
-      * @param fromIndex The array index at which to begin the search. If fromIndex is omitted, the
-      *  search starts at index 0.
-      */
-    indexOf(searchElement: number, fromIndex?: number): number;
-
-    /**
-      * Adds all the elements of an array separated by the specified separator string.
-      * @param separator A string used to separate one element of an array from the next in the
-      * resulting String. If omitted, the array elements are separated with a comma.
-      */
-    join(separator?: string): string;
-
-    /**
-      * Returns the index of the last occurrence of a value in an array.
-      * @param searchElement The value to locate in the array.
-      * @param fromIndex The array index at which to begin the search. If fromIndex is omitted, the
-      * search starts at index 0.
-      */
-    lastIndexOf(searchElement: number, fromIndex?: number): number;
-
-    /**
-      * The length of the array.
-      */
-    readonly length: number;
-
-    /**
-      * Calls a defined callback function on each element of an array, and returns an array that
-      * contains the results.
-      * @param callbackfn A function that accepts up to three arguments. The map method calls the
-      * callbackfn function one time for each element in the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    map(callbackfn: (value: number, index: number, array: Int8Array) => number, thisArg?: any): Int8Array;
-
-    /**
-      * Calls the specified callback function for all the elements in an array. The return value of
-      * the callback function is the accumulated result, and is provided as an argument in the next
-      * call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduce method calls the
-      * callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduce(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Int8Array) => number): number;
-    reduce(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Int8Array) => number, initialValue: number): number;
-
-    /**
-      * Calls the specified callback function for all the elements in an array. The return value of
-      * the callback function is the accumulated result, and is provided as an argument in the next
-      * call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduce method calls the
-      * callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduce<U>(callbackfn: (previousValue: U, currentValue: number, currentIndex: number, array: Int8Array) => U, initialValue: U): U;
-
-    /**
-      * Calls the specified callback function for all the elements in an array, in descending order.
-      * The return value of the callback function is the accumulated result, and is provided as an
-      * argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduceRight method calls
-      * the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an
-      * argument instead of an array value.
-      */
-    reduceRight(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Int8Array) => number): number;
-    reduceRight(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Int8Array) => number, initialValue: number): number;
-
-    /**
-      * Calls the specified callback function for all the elements in an array, in descending order.
-      * The return value of the callback function is the accumulated result, and is provided as an
-      * argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduceRight method calls
-      * the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduceRight<U>(callbackfn: (previousValue: U, currentValue: number, currentIndex: number, array: Int8Array) => U, initialValue: U): U;
-
-    /**
-      * Reverses the elements in an Array.
-      */
-    reverse(): Int8Array;
-
-    /**
-      * Sets a value or an array of values.
-      * @param array A typed or untyped array of values to set.
-      * @param offset The index in the current array at which the values are to be written.
-      */
-    set(array: ArrayLike<number>, offset?: number): void;
-
-    /**
-      * Returns a section of an array.
-      * @param start The beginning of the specified portion of the array.
-      * @param end The end of the specified portion of the array.
-      */
-    slice(start?: number, end?: number): Int8Array;
-
-    /**
-      * Determines whether the specified callback function returns true for any element of an array.
-      * @param callbackfn A function that accepts up to three arguments. The some method calls the
-      * callbackfn function for each element in array1 until the callbackfn returns true, or until
-      * the end of the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    some(callbackfn: (value: number, index: number, array: Int8Array) => boolean, thisArg?: any): boolean;
-
-    /**
-      * Sorts an array.
-      * @param compareFn The name of the function used to determine the order of the elements. If
-      * omitted, the elements are sorted in ascending, ASCII character order.
-      */
-    sort(compareFn?: (a: number, b: number) => number): this;
-
-    /**
-      * Gets a new Int8Array view of the ArrayBuffer store for this array, referencing the elements
-      * at begin, inclusive, up to end, exclusive.
-      * @param begin The index of the beginning of the array.
-      * @param end The index of the end of the array.
-      */
-    subarray(begin: number, end?: number): Int8Array;
-
-    /**
-      * Converts a number to a string by using the current locale.
-      */
-    toLocaleString(): string;
-
-    /**
-      * Returns a string representation of an array.
-      */
-    toString(): string;
-
-    [index: number]: number;
-}
-interface Int8ArrayConstructor {
-    readonly prototype: Int8Array;
-    new(length: number): Int8Array;
-    new(arrayOrArrayBuffer: ArrayLike<number> | ArrayBufferLike): Int8Array;
-    new(buffer: ArrayBufferLike, byteOffset: number, length?: number): Int8Array;
-
-    /**
-      * The size in bytes of each element in the array.
-      */
-    readonly BYTES_PER_ELEMENT: number;
-
-    /**
-      * Returns a new array from a set of elements.
-      * @param items A set of elements to include in the new array object.
-      */
-    of(...items: number[]): Int8Array;
-
-    /**
-      * Creates an array from an array-like or iterable object.
-      * @param arrayLike An array-like or iterable object to convert to an array.
-      * @param mapfn A mapping function to call on every element of the array.
-      * @param thisArg Value of 'this' used to invoke the mapfn.
-      */
-    from(arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int8Array;
-
-
-}
-declare const Int8Array: Int8ArrayConstructor;
-
-/**
-  * A typed array of 8-bit unsigned integer values. The contents are initialized to 0. If the
-  * requested number of bytes could not be allocated an exception is raised.
-  */
-interface Uint8Array {
-    /**
-      * The size in bytes of each element in the array.
-      */
-    readonly BYTES_PER_ELEMENT: number;
-
-    /**
-      * The ArrayBuffer instance referenced by the array.
-      */
-    readonly buffer: ArrayBufferLike;
-
-    /**
-      * The length in bytes of the array.
-      */
-    readonly byteLength: number;
-
-    /**
-      * The offset in bytes of the array.
-      */
-    readonly byteOffset: number;
-
-    /**
-      * Returns the this object after copying a section of the array identified by start and end
-      * to the same array starting at position target
-      * @param target If target is negative, it is treated as length+target where length is the
-      * length of the array.
-      * @param start If start is negative, it is treated as length+start. If end is negative, it
-      * is treated as length+end.
-      * @param end If not specified, length of the this object is used as its default value.
-      */
-    copyWithin(target: number, start: number, end?: number): this;
-
-    /**
-      * Determines whether all the members of an array satisfy the specified test.
-      * @param callbackfn A function that accepts up to three arguments. The every method calls
-      * the callbackfn function for each element in array1 until the callbackfn returns false,
-      * or until the end of the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    every(callbackfn: (value: number, index: number, array: Uint8Array) => boolean, thisArg?: any): boolean;
-
-    /**
-        * Returns the this object after filling the section identified by start and end with value
-        * @param value value to fill array section with
-        * @param start index to start filling the array at. If start is negative, it is treated as
-        * length+start where length is the length of the array.
-        * @param end index to stop filling the array at. If end is negative, it is treated as
-        * length+end.
-        */
-    fill(value: number, start?: number, end?: number): this;
-
-    /**
-      * Returns the elements of an array that meet the condition specified in a callback function.
-      * @param callbackfn A function that accepts up to three arguments. The filter method calls
-      * the callbackfn function one time for each element in the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    filter(callbackfn: (value: number, index: number, array: Uint8Array) => any, thisArg?: any): Uint8Array;
-
-    /**
-      * Returns the value of the first element in the array where predicate is true, and undefined
-      * otherwise.
-      * @param predicate find calls predicate once for each element of the array, in ascending
-      * order, until it finds one where predicate returns true. If such an element is found, find
-      * immediately returns that element value. Otherwise, find returns undefined.
-      * @param thisArg If provided, it will be used as the this value for each invocation of
-      * predicate. If it is not provided, undefined is used instead.
-      */
-    find(predicate: (value: number, index: number, obj: Uint8Array) => boolean, thisArg?: any): number | undefined;
-
-    /**
-      * Returns the index of the first element in the array where predicate is true, and -1
-      * otherwise.
-      * @param predicate find calls predicate once for each element of the array, in ascending
-      * order, until it finds one where predicate returns true. If such an element is found,
-      * findIndex immediately returns that element index. Otherwise, findIndex returns -1.
-      * @param thisArg If provided, it will be used as the this value for each invocation of
-      * predicate. If it is not provided, undefined is used instead.
-      */
-    findIndex(predicate: (value: number, index: number, obj: Uint8Array) => boolean, thisArg?: any): number;
-
-    /**
-      * Performs the specified action for each element in an array.
-      * @param callbackfn  A function that accepts up to three arguments. forEach calls the
-      * callbackfn function one time for each element in the array.
-      * @param thisArg  An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    forEach(callbackfn: (value: number, index: number, array: Uint8Array) => void, thisArg?: any): void;
-
-    /**
-      * Returns the index of the first occurrence of a value in an array.
-      * @param searchElement The value to locate in the array.
-      * @param fromIndex The array index at which to begin the search. If fromIndex is omitted, the
-      *  search starts at index 0.
-      */
-    indexOf(searchElement: number, fromIndex?: number): number;
-
-    /**
-      * Adds all the elements of an array separated by the specified separator string.
-      * @param separator A string used to separate one element of an array from the next in the
-      * resulting String. If omitted, the array elements are separated with a comma.
-      */
-    join(separator?: string): string;
-
-    /**
-      * Returns the index of the last occurrence of a value in an array.
-      * @param searchElement The value to locate in the array.
-      * @param fromIndex The array index at which to begin the search. If fromIndex is omitted, the
-      * search starts at index 0.
-      */
-    lastIndexOf(searchElement: number, fromIndex?: number): number;
-
-    /**
-      * The length of the array.
-      */
-    readonly length: number;
-
-    /**
-      * Calls a defined callback function on each element of an array, and returns an array that
-      * contains the results.
-      * @param callbackfn A function that accepts up to three arguments. The map method calls the
-      * callbackfn function one time for each element in the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    map(callbackfn: (value: number, index: number, array: Uint8Array) => number, thisArg?: any): Uint8Array;
-
-    /**
-      * Calls the specified callback function for all the elements in an array. The return value of
-      * the callback function is the accumulated result, and is provided as an argument in the next
-      * call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduce method calls the
-      * callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduce(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Uint8Array) => number): number;
-    reduce(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Uint8Array) => number, initialValue: number): number;
-
-    /**
-      * Calls the specified callback function for all the elements in an array. The return value of
-      * the callback function is the accumulated result, and is provided as an argument in the next
-      * call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduce method calls the
-      * callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduce<U>(callbackfn: (previousValue: U, currentValue: number, currentIndex: number, array: Uint8Array) => U, initialValue: U): U;
-
-    /**
-      * Calls the specified callback function for all the elements in an array, in descending order.
-      * The return value of the callback function is the accumulated result, and is provided as an
-      * argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduceRight method calls
-      * the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an
-      * argument instead of an array value.
-      */
-    reduceRight(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Uint8Array) => number): number;
-    reduceRight(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Uint8Array) => number, initialValue: number): number;
-
-    /**
-      * Calls the specified callback function for all the elements in an array, in descending order.
-      * The return value of the callback function is the accumulated result, and is provided as an
-      * argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduceRight method calls
-      * the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduceRight<U>(callbackfn: (previousValue: U, currentValue: number, currentIndex: number, array: Uint8Array) => U, initialValue: U): U;
-
-    /**
-      * Reverses the elements in an Array.
-      */
-    reverse(): Uint8Array;
-
-    /**
-      * Sets a value or an array of values.
-      * @param array A typed or untyped array of values to set.
-      * @param offset The index in the current array at which the values are to be written.
-      */
-    set(array: ArrayLike<number>, offset?: number): void;
-
-    /**
-      * Returns a section of an array.
-      * @param start The beginning of the specified portion of the array.
-      * @param end The end of the specified portion of the array.
-      */
-    slice(start?: number, end?: number): Uint8Array;
-
-    /**
-      * Determines whether the specified callback function returns true for any element of an array.
-      * @param callbackfn A function that accepts up to three arguments. The some method calls the
-      * callbackfn function for each element in array1 until the callbackfn returns true, or until
-      * the end of the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    some(callbackfn: (value: number, index: number, array: Uint8Array) => boolean, thisArg?: any): boolean;
-
-    /**
-      * Sorts an array.
-      * @param compareFn The name of the function used to determine the order of the elements. If
-      * omitted, the elements are sorted in ascending, ASCII character order.
-      */
-    sort(compareFn?: (a: number, b: number) => number): this;
-
-    /**
-      * Gets a new Uint8Array view of the ArrayBuffer store for this array, referencing the elements
-      * at begin, inclusive, up to end, exclusive.
-      * @param begin The index of the beginning of the array.
-      * @param end The index of the end of the array.
-      */
-    subarray(begin: number, end?: number): Uint8Array;
-
-    /**
-      * Converts a number to a string by using the current locale.
-      */
-    toLocaleString(): string;
-
-    /**
-      * Returns a string representation of an array.
-      */
-    toString(): string;
-
-    [index: number]: number;
-}
-
-interface Uint8ArrayConstructor {
-    readonly prototype: Uint8Array;
-    new(length: number): Uint8Array;
-    new(arrayOrArrayBuffer: ArrayLike<number> | ArrayBufferLike): Uint8Array;
-    new(buffer: ArrayBufferLike, byteOffset: number, length?: number): Uint8Array;
-
-    /**
-      * The size in bytes of each element in the array.
-      */
-    readonly BYTES_PER_ELEMENT: number;
-
-    /**
-      * Returns a new array from a set of elements.
-      * @param items A set of elements to include in the new array object.
-      */
-    of(...items: number[]): Uint8Array;
-
-    /**
-      * Creates an array from an array-like or iterable object.
-      * @param arrayLike An array-like or iterable object to convert to an array.
-      * @param mapfn A mapping function to call on every element of the array.
-      * @param thisArg Value of 'this' used to invoke the mapfn.
-      */
-    from(arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint8Array;
-
-}
-declare const Uint8Array: Uint8ArrayConstructor;
-
-/**
-  * A typed array of 8-bit unsigned integer (clamped) values. The contents are initialized to 0.
-  * If the requested number of bytes could not be allocated an exception is raised.
-  */
-interface Uint8ClampedArray {
-    /**
-      * The size in bytes of each element in the array.
-      */
-    readonly BYTES_PER_ELEMENT: number;
-
-    /**
-      * The ArrayBuffer instance referenced by the array.
-      */
-    readonly buffer: ArrayBufferLike;
-
-    /**
-      * The length in bytes of the array.
-      */
-    readonly byteLength: number;
-
-    /**
-      * The offset in bytes of the array.
-      */
-    readonly byteOffset: number;
-
-    /**
-      * Returns the this object after copying a section of the array identified by start and end
-      * to the same array starting at position target
-      * @param target If target is negative, it is treated as length+target where length is the
-      * length of the array.
-      * @param start If start is negative, it is treated as length+start. If end is negative, it
-      * is treated as length+end.
-      * @param end If not specified, length of the this object is used as its default value.
-      */
-    copyWithin(target: number, start: number, end?: number): this;
-
-    /**
-      * Determines whether all the members of an array satisfy the specified test.
-      * @param callbackfn A function that accepts up to three arguments. The every method calls
-      * the callbackfn function for each element in array1 until the callbackfn returns false,
-      * or until the end of the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    every(callbackfn: (value: number, index: number, array: Uint8ClampedArray) => boolean, thisArg?: any): boolean;
-
-    /**
-        * Returns the this object after filling the section identified by start and end with value
-        * @param value value to fill array section with
-        * @param start index to start filling the array at. If start is negative, it is treated as
-        * length+start where length is the length of the array.
-        * @param end index to stop filling the array at. If end is negative, it is treated as
-        * length+end.
-        */
-    fill(value: number, start?: number, end?: number): this;
-
-    /**
-      * Returns the elements of an array that meet the condition specified in a callback function.
-      * @param callbackfn A function that accepts up to three arguments. The filter method calls
-      * the callbackfn function one time for each element in the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    filter(callbackfn: (value: number, index: number, array: Uint8ClampedArray) => any, thisArg?: any): Uint8ClampedArray;
-
-    /**
-      * Returns the value of the first element in the array where predicate is true, and undefined
-      * otherwise.
-      * @param predicate find calls predicate once for each element of the array, in ascending
-      * order, until it finds one where predicate returns true. If such an element is found, find
-      * immediately returns that element value. Otherwise, find returns undefined.
-      * @param thisArg If provided, it will be used as the this value for each invocation of
-      * predicate. If it is not provided, undefined is used instead.
-      */
-    find(predicate: (value: number, index: number, obj: Uint8ClampedArray) => boolean, thisArg?: any): number | undefined;
-
-    /**
-      * Returns the index of the first element in the array where predicate is true, and -1
-      * otherwise.
-      * @param predicate find calls predicate once for each element of the array, in ascending
-      * order, until it finds one where predicate returns true. If such an element is found,
-      * findIndex immediately returns that element index. Otherwise, findIndex returns -1.
-      * @param thisArg If provided, it will be used as the this value for each invocation of
-      * predicate. If it is not provided, undefined is used instead.
-      */
-    findIndex(predicate: (value: number, index: number, obj: Uint8ClampedArray) => boolean, thisArg?: any): number;
-
-    /**
-      * Performs the specified action for each element in an array.
-      * @param callbackfn  A function that accepts up to three arguments. forEach calls the
-      * callbackfn function one time for each element in the array.
-      * @param thisArg  An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    forEach(callbackfn: (value: number, index: number, array: Uint8ClampedArray) => void, thisArg?: any): void;
-
-    /**
-      * Returns the index of the first occurrence of a value in an array.
-      * @param searchElement The value to locate in the array.
-      * @param fromIndex The array index at which to begin the search. If fromIndex is omitted, the
-      *  search starts at index 0.
-      */
-    indexOf(searchElement: number, fromIndex?: number): number;
-
-    /**
-      * Adds all the elements of an array separated by the specified separator string.
-      * @param separator A string used to separate one element of an array from the next in the
-      * resulting String. If omitted, the array elements are separated with a comma.
-      */
-    join(separator?: string): string;
-
-    /**
-      * Returns the index of the last occurrence of a value in an array.
-      * @param searchElement The value to locate in the array.
-      * @param fromIndex The array index at which to begin the search. If fromIndex is omitted, the
-      * search starts at index 0.
-      */
-    lastIndexOf(searchElement: number, fromIndex?: number): number;
-
-    /**
-      * The length of the array.
-      */
-    readonly length: number;
-
-    /**
-      * Calls a defined callback function on each element of an array, and returns an array that
-      * contains the results.
-      * @param callbackfn A function that accepts up to three arguments. The map method calls the
-      * callbackfn function one time for each element in the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    map(callbackfn: (value: number, index: number, array: Uint8ClampedArray) => number, thisArg?: any): Uint8ClampedArray;
-
-    /**
-      * Calls the specified callback function for all the elements in an array. The return value of
-      * the callback function is the accumulated result, and is provided as an argument in the next
-      * call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduce method calls the
-      * callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduce(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Uint8ClampedArray) => number): number;
-    reduce(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Uint8ClampedArray) => number, initialValue: number): number;
-
-    /**
-      * Calls the specified callback function for all the elements in an array. The return value of
-      * the callback function is the accumulated result, and is provided as an argument in the next
-      * call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduce method calls the
-      * callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduce<U>(callbackfn: (previousValue: U, currentValue: number, currentIndex: number, array: Uint8ClampedArray) => U, initialValue: U): U;
-
-    /**
-      * Calls the specified callback function for all the elements in an array, in descending order.
-      * The return value of the callback function is the accumulated result, and is provided as an
-      * argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduceRight method calls
-      * the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an
-      * argument instead of an array value.
-      */
-    reduceRight(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Uint8ClampedArray) => number): number;
-    reduceRight(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Uint8ClampedArray) => number, initialValue: number): number;
-
-    /**
-      * Calls the specified callback function for all the elements in an array, in descending order.
-      * The return value of the callback function is the accumulated result, and is provided as an
-      * argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduceRight method calls
-      * the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduceRight<U>(callbackfn: (previousValue: U, currentValue: number, currentIndex: number, array: Uint8ClampedArray) => U, initialValue: U): U;
-
-    /**
-      * Reverses the elements in an Array.
-      */
-    reverse(): Uint8ClampedArray;
-
-    /**
-      * Sets a value or an array of values.
-      * @param array A typed or untyped array of values to set.
-      * @param offset The index in the current array at which the values are to be written.
-      */
-    set(array: ArrayLike<number>, offset?: number): void;
-
-    /**
-      * Returns a section of an array.
-      * @param start The beginning of the specified portion of the array.
-      * @param end The end of the specified portion of the array.
-      */
-    slice(start?: number, end?: number): Uint8ClampedArray;
-
-    /**
-      * Determines whether the specified callback function returns true for any element of an array.
-      * @param callbackfn A function that accepts up to three arguments. The some method calls the
-      * callbackfn function for each element in array1 until the callbackfn returns true, or until
-      * the end of the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    some(callbackfn: (value: number, index: number, array: Uint8ClampedArray) => boolean, thisArg?: any): boolean;
-
-    /**
-      * Sorts an array.
-      * @param compareFn The name of the function used to determine the order of the elements. If
-      * omitted, the elements are sorted in ascending, ASCII character order.
-      */
-    sort(compareFn?: (a: number, b: number) => number): this;
-
-    /**
-      * Gets a new Uint8ClampedArray view of the ArrayBuffer store for this array, referencing the elements
-      * at begin, inclusive, up to end, exclusive.
-      * @param begin The index of the beginning of the array.
-      * @param end The index of the end of the array.
-      */
-    subarray(begin: number, end?: number): Uint8ClampedArray;
-
-    /**
-      * Converts a number to a string by using the current locale.
-      */
-    toLocaleString(): string;
-
-    /**
-      * Returns a string representation of an array.
-      */
-    toString(): string;
-
-    [index: number]: number;
-}
-
-interface Uint8ClampedArrayConstructor {
-    readonly prototype: Uint8ClampedArray;
-    new(length: number): Uint8ClampedArray;
-    new(arrayOrArrayBuffer: ArrayLike<number> | ArrayBufferLike): Uint8ClampedArray;
-    new(buffer: ArrayBufferLike, byteOffset: number, length?: number): Uint8ClampedArray;
-
-    /**
-      * The size in bytes of each element in the array.
-      */
-    readonly BYTES_PER_ELEMENT: number;
-
-    /**
-      * Returns a new array from a set of elements.
-      * @param items A set of elements to include in the new array object.
-      */
-    of(...items: number[]): Uint8ClampedArray;
-
-    /**
-      * Creates an array from an array-like or iterable object.
-      * @param arrayLike An array-like or iterable object to convert to an array.
-      * @param mapfn A mapping function to call on every element of the array.
-      * @param thisArg Value of 'this' used to invoke the mapfn.
-      */
-    from(arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint8ClampedArray;
-}
-declare const Uint8ClampedArray: Uint8ClampedArrayConstructor;
-
-/**
-  * A typed array of 16-bit signed integer values. The contents are initialized to 0. If the
-  * requested number of bytes could not be allocated an exception is raised.
-  */
-interface Int16Array {
-    /**
-      * The size in bytes of each element in the array.
-      */
-    readonly BYTES_PER_ELEMENT: number;
-
-    /**
-      * The ArrayBuffer instance referenced by the array.
-      */
-    readonly buffer: ArrayBufferLike;
-
-    /**
-      * The length in bytes of the array.
-      */
-    readonly byteLength: number;
-
-    /**
-      * The offset in bytes of the array.
-      */
-    readonly byteOffset: number;
-
-    /**
-      * Returns the this object after copying a section of the array identified by start and end
-      * to the same array starting at position target
-      * @param target If target is negative, it is treated as length+target where length is the
-      * length of the array.
-      * @param start If start is negative, it is treated as length+start. If end is negative, it
-      * is treated as length+end.
-      * @param end If not specified, length of the this object is used as its default value.
-      */
-    copyWithin(target: number, start: number, end?: number): this;
-
-    /**
-      * Determines whether all the members of an array satisfy the specified test.
-      * @param callbackfn A function that accepts up to three arguments. The every method calls
-      * the callbackfn function for each element in array1 until the callbackfn returns false,
-      * or until the end of the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    every(callbackfn: (value: number, index: number, array: Int16Array) => boolean, thisArg?: any): boolean;
-
-    /**
-        * Returns the this object after filling the section identified by start and end with value
-        * @param value value to fill array section with
-        * @param start index to start filling the array at. If start is negative, it is treated as
-        * length+start where length is the length of the array.
-        * @param end index to stop filling the array at. If end is negative, it is treated as
-        * length+end.
-        */
-    fill(value: number, start?: number, end?: number): this;
-
-    /**
-      * Returns the elements of an array that meet the condition specified in a callback function.
-      * @param callbackfn A function that accepts up to three arguments. The filter method calls
-      * the callbackfn function one time for each element in the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    filter(callbackfn: (value: number, index: number, array: Int16Array) => any, thisArg?: any): Int16Array;
-
-    /**
-      * Returns the value of the first element in the array where predicate is true, and undefined
-      * otherwise.
-      * @param predicate find calls predicate once for each element of the array, in ascending
-      * order, until it finds one where predicate returns true. If such an element is found, find
-      * immediately returns that element value. Otherwise, find returns undefined.
-      * @param thisArg If provided, it will be used as the this value for each invocation of
-      * predicate. If it is not provided, undefined is used instead.
-      */
-    find(predicate: (value: number, index: number, obj: Int16Array) => boolean, thisArg?: any): number | undefined;
-
-    /**
-      * Returns the index of the first element in the array where predicate is true, and -1
-      * otherwise.
-      * @param predicate find calls predicate once for each element of the array, in ascending
-      * order, until it finds one where predicate returns true. If such an element is found,
-      * findIndex immediately returns that element index. Otherwise, findIndex returns -1.
-      * @param thisArg If provided, it will be used as the this value for each invocation of
-      * predicate. If it is not provided, undefined is used instead.
-      */
-    findIndex(predicate: (value: number, index: number, obj: Int16Array) => boolean, thisArg?: any): number;
-
-    /**
-      * Performs the specified action for each element in an array.
-      * @param callbackfn  A function that accepts up to three arguments. forEach calls the
-      * callbackfn function one time for each element in the array.
-      * @param thisArg  An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    forEach(callbackfn: (value: number, index: number, array: Int16Array) => void, thisArg?: any): void;
-    /**
-      * Returns the index of the first occurrence of a value in an array.
-      * @param searchElement The value to locate in the array.
-      * @param fromIndex The array index at which to begin the search. If fromIndex is omitted, the
-      *  search starts at index 0.
-      */
-    indexOf(searchElement: number, fromIndex?: number): number;
-
-    /**
-      * Adds all the elements of an array separated by the specified separator string.
-      * @param separator A string used to separate one element of an array from the next in the
-      * resulting String. If omitted, the array elements are separated with a comma.
-      */
-    join(separator?: string): string;
-
-    /**
-      * Returns the index of the last occurrence of a value in an array.
-      * @param searchElement The value to locate in the array.
-      * @param fromIndex The array index at which to begin the search. If fromIndex is omitted, the
-      * search starts at index 0.
-      */
-    lastIndexOf(searchElement: number, fromIndex?: number): number;
-
-    /**
-      * The length of the array.
-      */
-    readonly length: number;
-
-    /**
-      * Calls a defined callback function on each element of an array, and returns an array that
-      * contains the results.
-      * @param callbackfn A function that accepts up to three arguments. The map method calls the
-      * callbackfn function one time for each element in the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    map(callbackfn: (value: number, index: number, array: Int16Array) => number, thisArg?: any): Int16Array;
-
-    /**
-      * Calls the specified callback function for all the elements in an array. The return value of
-      * the callback function is the accumulated result, and is provided as an argument in the next
-      * call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduce method calls the
-      * callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduce(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Int16Array) => number): number;
-    reduce(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Int16Array) => number, initialValue: number): number;
-
-    /**
-      * Calls the specified callback function for all the elements in an array. The return value of
-      * the callback function is the accumulated result, and is provided as an argument in the next
-      * call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduce method calls the
-      * callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduce<U>(callbackfn: (previousValue: U, currentValue: number, currentIndex: number, array: Int16Array) => U, initialValue: U): U;
-
-    /**
-      * Calls the specified callback function for all the elements in an array, in descending order.
-      * The return value of the callback function is the accumulated result, and is provided as an
-      * argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduceRight method calls
-      * the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an
-      * argument instead of an array value.
-      */
-    reduceRight(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Int16Array) => number): number;
-    reduceRight(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Int16Array) => number, initialValue: number): number;
-
-    /**
-      * Calls the specified callback function for all the elements in an array, in descending order.
-      * The return value of the callback function is the accumulated result, and is provided as an
-      * argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduceRight method calls
-      * the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduceRight<U>(callbackfn: (previousValue: U, currentValue: number, currentIndex: number, array: Int16Array) => U, initialValue: U): U;
-
-    /**
-      * Reverses the elements in an Array.
-      */
-    reverse(): Int16Array;
-
-    /**
-      * Sets a value or an array of values.
-      * @param array A typed or untyped array of values to set.
-      * @param offset The index in the current array at which the values are to be written.
-      */
-    set(array: ArrayLike<number>, offset?: number): void;
-
-    /**
-      * Returns a section of an array.
-      * @param start The beginning of the specified portion of the array.
-      * @param end The end of the specified portion of the array.
-      */
-    slice(start?: number, end?: number): Int16Array;
-
-    /**
-      * Determines whether the specified callback function returns true for any element of an array.
-      * @param callbackfn A function that accepts up to three arguments. The some method calls the
-      * callbackfn function for each element in array1 until the callbackfn returns true, or until
-      * the end of the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    some(callbackfn: (value: number, index: number, array: Int16Array) => boolean, thisArg?: any): boolean;
-
-    /**
-      * Sorts an array.
-      * @param compareFn The name of the function used to determine the order of the elements. If
-      * omitted, the elements are sorted in ascending, ASCII character order.
-      */
-    sort(compareFn?: (a: number, b: number) => number): this;
-
-    /**
-      * Gets a new Int16Array view of the ArrayBuffer store for this array, referencing the elements
-      * at begin, inclusive, up to end, exclusive.
-      * @param begin The index of the beginning of the array.
-      * @param end The index of the end of the array.
-      */
-    subarray(begin: number, end?: number): Int16Array;
-
-    /**
-      * Converts a number to a string by using the current locale.
-      */
-    toLocaleString(): string;
-
-    /**
-      * Returns a string representation of an array.
-      */
-    toString(): string;
-
-    [index: number]: number;
-}
-
-interface Int16ArrayConstructor {
-    readonly prototype: Int16Array;
-    new(length: number): Int16Array;
-    new(arrayOrArrayBuffer: ArrayLike<number> | ArrayBufferLike): Int16Array;
-    new(buffer: ArrayBufferLike, byteOffset: number, length?: number): Int16Array;
-
-    /**
-      * The size in bytes of each element in the array.
-      */
-    readonly BYTES_PER_ELEMENT: number;
-
-    /**
-      * Returns a new array from a set of elements.
-      * @param items A set of elements to include in the new array object.
-      */
-    of(...items: number[]): Int16Array;
-
-    /**
-      * Creates an array from an array-like or iterable object.
-      * @param arrayLike An array-like or iterable object to convert to an array.
-      * @param mapfn A mapping function to call on every element of the array.
-      * @param thisArg Value of 'this' used to invoke the mapfn.
-      */
-    from(arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int16Array;
-
-
-}
-declare const Int16Array: Int16ArrayConstructor;
-
-/**
-  * A typed array of 16-bit unsigned integer values. The contents are initialized to 0. If the
-  * requested number of bytes could not be allocated an exception is raised.
-  */
-interface Uint16Array {
-    /**
-      * The size in bytes of each element in the array.
-      */
-    readonly BYTES_PER_ELEMENT: number;
-
-    /**
-      * The ArrayBuffer instance referenced by the array.
-      */
-    readonly buffer: ArrayBufferLike;
-
-    /**
-      * The length in bytes of the array.
-      */
-    readonly byteLength: number;
-
-    /**
-      * The offset in bytes of the array.
-      */
-    readonly byteOffset: number;
-
-    /**
-      * Returns the this object after copying a section of the array identified by start and end
-      * to the same array starting at position target
-      * @param target If target is negative, it is treated as length+target where length is the
-      * length of the array.
-      * @param start If start is negative, it is treated as length+start. If end is negative, it
-      * is treated as length+end.
-      * @param end If not specified, length of the this object is used as its default value.
-      */
-    copyWithin(target: number, start: number, end?: number): this;
-
-    /**
-      * Determines whether all the members of an array satisfy the specified test.
-      * @param callbackfn A function that accepts up to three arguments. The every method calls
-      * the callbackfn function for each element in array1 until the callbackfn returns false,
-      * or until the end of the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    every(callbackfn: (value: number, index: number, array: Uint16Array) => boolean, thisArg?: any): boolean;
-
-    /**
-        * Returns the this object after filling the section identified by start and end with value
-        * @param value value to fill array section with
-        * @param start index to start filling the array at. If start is negative, it is treated as
-        * length+start where length is the length of the array.
-        * @param end index to stop filling the array at. If end is negative, it is treated as
-        * length+end.
-        */
-    fill(value: number, start?: number, end?: number): this;
-
-    /**
-      * Returns the elements of an array that meet the condition specified in a callback function.
-      * @param callbackfn A function that accepts up to three arguments. The filter method calls
-      * the callbackfn function one time for each element in the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    filter(callbackfn: (value: number, index: number, array: Uint16Array) => any, thisArg?: any): Uint16Array;
-
-    /**
-      * Returns the value of the first element in the array where predicate is true, and undefined
-      * otherwise.
-      * @param predicate find calls predicate once for each element of the array, in ascending
-      * order, until it finds one where predicate returns true. If such an element is found, find
-      * immediately returns that element value. Otherwise, find returns undefined.
-      * @param thisArg If provided, it will be used as the this value for each invocation of
-      * predicate. If it is not provided, undefined is used instead.
-      */
-    find(predicate: (value: number, index: number, obj: Uint16Array) => boolean, thisArg?: any): number | undefined;
-
-    /**
-      * Returns the index of the first element in the array where predicate is true, and -1
-      * otherwise.
-      * @param predicate find calls predicate once for each element of the array, in ascending
-      * order, until it finds one where predicate returns true. If such an element is found,
-      * findIndex immediately returns that element index. Otherwise, findIndex returns -1.
-      * @param thisArg If provided, it will be used as the this value for each invocation of
-      * predicate. If it is not provided, undefined is used instead.
-      */
-    findIndex(predicate: (value: number, index: number, obj: Uint16Array) => boolean, thisArg?: any): number;
-
-    /**
-      * Performs the specified action for each element in an array.
-      * @param callbackfn  A function that accepts up to three arguments. forEach calls the
-      * callbackfn function one time for each element in the array.
-      * @param thisArg  An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    forEach(callbackfn: (value: number, index: number, array: Uint16Array) => void, thisArg?: any): void;
-
-    /**
-      * Returns the index of the first occurrence of a value in an array.
-      * @param searchElement The value to locate in the array.
-      * @param fromIndex The array index at which to begin the search. If fromIndex is omitted, the
-      *  search starts at index 0.
-      */
-    indexOf(searchElement: number, fromIndex?: number): number;
-
-    /**
-      * Adds all the elements of an array separated by the specified separator string.
-      * @param separator A string used to separate one element of an array from the next in the
-      * resulting String. If omitted, the array elements are separated with a comma.
-      */
-    join(separator?: string): string;
-
-    /**
-      * Returns the index of the last occurrence of a value in an array.
-      * @param searchElement The value to locate in the array.
-      * @param fromIndex The array index at which to begin the search. If fromIndex is omitted, the
-      * search starts at index 0.
-      */
-    lastIndexOf(searchElement: number, fromIndex?: number): number;
-
-    /**
-      * The length of the array.
-      */
-    readonly length: number;
-
-    /**
-      * Calls a defined callback function on each element of an array, and returns an array that
-      * contains the results.
-      * @param callbackfn A function that accepts up to three arguments. The map method calls the
-      * callbackfn function one time for each element in the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    map(callbackfn: (value: number, index: number, array: Uint16Array) => number, thisArg?: any): Uint16Array;
-
-    /**
-      * Calls the specified callback function for all the elements in an array. The return value of
-      * the callback function is the accumulated result, and is provided as an argument in the next
-      * call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduce method calls the
-      * callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduce(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Uint16Array) => number): number;
-    reduce(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Uint16Array) => number, initialValue: number): number;
-
-    /**
-      * Calls the specified callback function for all the elements in an array. The return value of
-      * the callback function is the accumulated result, and is provided as an argument in the next
-      * call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduce method calls the
-      * callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduce<U>(callbackfn: (previousValue: U, currentValue: number, currentIndex: number, array: Uint16Array) => U, initialValue: U): U;
-
-    /**
-      * Calls the specified callback function for all the elements in an array, in descending order.
-      * The return value of the callback function is the accumulated result, and is provided as an
-      * argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduceRight method calls
-      * the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an
-      * argument instead of an array value.
-      */
-    reduceRight(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Uint16Array) => number): number;
-    reduceRight(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Uint16Array) => number, initialValue: number): number;
-
-    /**
-      * Calls the specified callback function for all the elements in an array, in descending order.
-      * The return value of the callback function is the accumulated result, and is provided as an
-      * argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduceRight method calls
-      * the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduceRight<U>(callbackfn: (previousValue: U, currentValue: number, currentIndex: number, array: Uint16Array) => U, initialValue: U): U;
-
-    /**
-      * Reverses the elements in an Array.
-      */
-    reverse(): Uint16Array;
-
-    /**
-      * Sets a value or an array of values.
-      * @param array A typed or untyped array of values to set.
-      * @param offset The index in the current array at which the values are to be written.
-      */
-    set(array: ArrayLike<number>, offset?: number): void;
-
-    /**
-      * Returns a section of an array.
-      * @param start The beginning of the specified portion of the array.
-      * @param end The end of the specified portion of the array.
-      */
-    slice(start?: number, end?: number): Uint16Array;
-
-    /**
-      * Determines whether the specified callback function returns true for any element of an array.
-      * @param callbackfn A function that accepts up to three arguments. The some method calls the
-      * callbackfn function for each element in array1 until the callbackfn returns true, or until
-      * the end of the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    some(callbackfn: (value: number, index: number, array: Uint16Array) => boolean, thisArg?: any): boolean;
-
-    /**
-      * Sorts an array.
-      * @param compareFn The name of the function used to determine the order of the elements. If
-      * omitted, the elements are sorted in ascending, ASCII character order.
-      */
-    sort(compareFn?: (a: number, b: number) => number): this;
-
-    /**
-      * Gets a new Uint16Array view of the ArrayBuffer store for this array, referencing the elements
-      * at begin, inclusive, up to end, exclusive.
-      * @param begin The index of the beginning of the array.
-      * @param end The index of the end of the array.
-      */
-    subarray(begin: number, end?: number): Uint16Array;
-
-    /**
-      * Converts a number to a string by using the current locale.
-      */
-    toLocaleString(): string;
-
-    /**
-      * Returns a string representation of an array.
-      */
-    toString(): string;
-
-    [index: number]: number;
-}
-
-interface Uint16ArrayConstructor {
-    readonly prototype: Uint16Array;
-    new(length: number): Uint16Array;
-    new(arrayOrArrayBuffer: ArrayLike<number> | ArrayBufferLike): Uint16Array;
-    new(buffer: ArrayBufferLike, byteOffset: number, length?: number): Uint16Array;
-
-    /**
-      * The size in bytes of each element in the array.
-      */
-    readonly BYTES_PER_ELEMENT: number;
-
-    /**
-      * Returns a new array from a set of elements.
-      * @param items A set of elements to include in the new array object.
-      */
-    of(...items: number[]): Uint16Array;
-
-    /**
-      * Creates an array from an array-like or iterable object.
-      * @param arrayLike An array-like or iterable object to convert to an array.
-      * @param mapfn A mapping function to call on every element of the array.
-      * @param thisArg Value of 'this' used to invoke the mapfn.
-      */
-    from(arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint16Array;
-
-
-}
-declare const Uint16Array: Uint16ArrayConstructor;
-/**
-  * A typed array of 32-bit signed integer values. The contents are initialized to 0. If the
-  * requested number of bytes could not be allocated an exception is raised.
-  */
-interface Int32Array {
-    /**
-      * The size in bytes of each element in the array.
-      */
-    readonly BYTES_PER_ELEMENT: number;
-
-    /**
-      * The ArrayBuffer instance referenced by the array.
-      */
-    readonly buffer: ArrayBufferLike;
-
-    /**
-      * The length in bytes of the array.
-      */
-    readonly byteLength: number;
-
-    /**
-      * The offset in bytes of the array.
-      */
-    readonly byteOffset: number;
-
-    /**
-      * Returns the this object after copying a section of the array identified by start and end
-      * to the same array starting at position target
-      * @param target If target is negative, it is treated as length+target where length is the
-      * length of the array.
-      * @param start If start is negative, it is treated as length+start. If end is negative, it
-      * is treated as length+end.
-      * @param end If not specified, length of the this object is used as its default value.
-      */
-    copyWithin(target: number, start: number, end?: number): this;
-
-    /**
-      * Determines whether all the members of an array satisfy the specified test.
-      * @param callbackfn A function that accepts up to three arguments. The every method calls
-      * the callbackfn function for each element in array1 until the callbackfn returns false,
-      * or until the end of the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    every(callbackfn: (value: number, index: number, array: Int32Array) => boolean, thisArg?: any): boolean;
-
-    /**
-        * Returns the this object after filling the section identified by start and end with value
-        * @param value value to fill array section with
-        * @param start index to start filling the array at. If start is negative, it is treated as
-        * length+start where length is the length of the array.
-        * @param end index to stop filling the array at. If end is negative, it is treated as
-        * length+end.
-        */
-    fill(value: number, start?: number, end?: number): this;
-
-    /**
-      * Returns the elements of an array that meet the condition specified in a callback function.
-      * @param callbackfn A function that accepts up to three arguments. The filter method calls
-      * the callbackfn function one time for each element in the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    filter(callbackfn: (value: number, index: number, array: Int32Array) => any, thisArg?: any): Int32Array;
-
-    /**
-      * Returns the value of the first element in the array where predicate is true, and undefined
-      * otherwise.
-      * @param predicate find calls predicate once for each element of the array, in ascending
-      * order, until it finds one where predicate returns true. If such an element is found, find
-      * immediately returns that element value. Otherwise, find returns undefined.
-      * @param thisArg If provided, it will be used as the this value for each invocation of
-      * predicate. If it is not provided, undefined is used instead.
-      */
-    find(predicate: (value: number, index: number, obj: Int32Array) => boolean, thisArg?: any): number | undefined;
-
-    /**
-      * Returns the index of the first element in the array where predicate is true, and -1
-      * otherwise.
-      * @param predicate find calls predicate once for each element of the array, in ascending
-      * order, until it finds one where predicate returns true. If such an element is found,
-      * findIndex immediately returns that element index. Otherwise, findIndex returns -1.
-      * @param thisArg If provided, it will be used as the this value for each invocation of
-      * predicate. If it is not provided, undefined is used instead.
-      */
-    findIndex(predicate: (value: number, index: number, obj: Int32Array) => boolean, thisArg?: any): number;
-
-    /**
-      * Performs the specified action for each element in an array.
-      * @param callbackfn  A function that accepts up to three arguments. forEach calls the
-      * callbackfn function one time for each element in the array.
-      * @param thisArg  An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    forEach(callbackfn: (value: number, index: number, array: Int32Array) => void, thisArg?: any): void;
-
-    /**
-      * Returns the index of the first occurrence of a value in an array.
-      * @param searchElement The value to locate in the array.
-      * @param fromIndex The array index at which to begin the search. If fromIndex is omitted, the
-      *  search starts at index 0.
-      */
-    indexOf(searchElement: number, fromIndex?: number): number;
-
-    /**
-      * Adds all the elements of an array separated by the specified separator string.
-      * @param separator A string used to separate one element of an array from the next in the
-      * resulting String. If omitted, the array elements are separated with a comma.
-      */
-    join(separator?: string): string;
-
-    /**
-      * Returns the index of the last occurrence of a value in an array.
-      * @param searchElement The value to locate in the array.
-      * @param fromIndex The array index at which to begin the search. If fromIndex is omitted, the
-      * search starts at index 0.
-      */
-    lastIndexOf(searchElement: number, fromIndex?: number): number;
-
-    /**
-      * The length of the array.
-      */
-    readonly length: number;
-
-    /**
-      * Calls a defined callback function on each element of an array, and returns an array that
-      * contains the results.
-      * @param callbackfn A function that accepts up to three arguments. The map method calls the
-      * callbackfn function one time for each element in the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    map(callbackfn: (value: number, index: number, array: Int32Array) => number, thisArg?: any): Int32Array;
-
-    /**
-      * Calls the specified callback function for all the elements in an array. The return value of
-      * the callback function is the accumulated result, and is provided as an argument in the next
-      * call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduce method calls the
-      * callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduce(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Int32Array) => number): number;
-    reduce(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Int32Array) => number, initialValue: number): number;
-
-    /**
-      * Calls the specified callback function for all the elements in an array. The return value of
-      * the callback function is the accumulated result, and is provided as an argument in the next
-      * call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduce method calls the
-      * callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduce<U>(callbackfn: (previousValue: U, currentValue: number, currentIndex: number, array: Int32Array) => U, initialValue: U): U;
-
-    /**
-      * Calls the specified callback function for all the elements in an array, in descending order.
-      * The return value of the callback function is the accumulated result, and is provided as an
-      * argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduceRight method calls
-      * the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an
-      * argument instead of an array value.
-      */
-    reduceRight(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Int32Array) => number): number;
-    reduceRight(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Int32Array) => number, initialValue: number): number;
-
-    /**
-      * Calls the specified callback function for all the elements in an array, in descending order.
-      * The return value of the callback function is the accumulated result, and is provided as an
-      * argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduceRight method calls
-      * the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduceRight<U>(callbackfn: (previousValue: U, currentValue: number, currentIndex: number, array: Int32Array) => U, initialValue: U): U;
-
-    /**
-      * Reverses the elements in an Array.
-      */
-    reverse(): Int32Array;
-
-    /**
-      * Sets a value or an array of values.
-      * @param array A typed or untyped array of values to set.
-      * @param offset The index in the current array at which the values are to be written.
-      */
-    set(array: ArrayLike<number>, offset?: number): void;
-
-    /**
-      * Returns a section of an array.
-      * @param start The beginning of the specified portion of the array.
-      * @param end The end of the specified portion of the array.
-      */
-    slice(start?: number, end?: number): Int32Array;
-
-    /**
-      * Determines whether the specified callback function returns true for any element of an array.
-      * @param callbackfn A function that accepts up to three arguments. The some method calls the
-      * callbackfn function for each element in array1 until the callbackfn returns true, or until
-      * the end of the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    some(callbackfn: (value: number, index: number, array: Int32Array) => boolean, thisArg?: any): boolean;
-
-    /**
-      * Sorts an array.
-      * @param compareFn The name of the function used to determine the order of the elements. If
-      * omitted, the elements are sorted in ascending, ASCII character order.
-      */
-    sort(compareFn?: (a: number, b: number) => number): this;
-
-    /**
-      * Gets a new Int32Array view of the ArrayBuffer store for this array, referencing the elements
-      * at begin, inclusive, up to end, exclusive.
-      * @param begin The index of the beginning of the array.
-      * @param end The index of the end of the array.
-      */
-    subarray(begin: number, end?: number): Int32Array;
-
-    /**
-      * Converts a number to a string by using the current locale.
-      */
-    toLocaleString(): string;
-
-    /**
-      * Returns a string representation of an array.
-      */
-    toString(): string;
-
-    [index: number]: number;
-}
-
-interface Int32ArrayConstructor {
-    readonly prototype: Int32Array;
-    new(length: number): Int32Array;
-    new(arrayOrArrayBuffer: ArrayLike<number> | ArrayBufferLike): Int32Array;
-    new(buffer: ArrayBufferLike, byteOffset: number, length?: number): Int32Array;
-
-    /**
-      * The size in bytes of each element in the array.
-      */
-    readonly BYTES_PER_ELEMENT: number;
-
-    /**
-      * Returns a new array from a set of elements.
-      * @param items A set of elements to include in the new array object.
-      */
-    of(...items: number[]): Int32Array;
-
-    /**
-      * Creates an array from an array-like or iterable object.
-      * @param arrayLike An array-like or iterable object to convert to an array.
-      * @param mapfn A mapping function to call on every element of the array.
-      * @param thisArg Value of 'this' used to invoke the mapfn.
-      */
-    from(arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int32Array;
-
-}
-declare const Int32Array: Int32ArrayConstructor;
-
-/**
-  * A typed array of 32-bit unsigned integer values. The contents are initialized to 0. If the
-  * requested number of bytes could not be allocated an exception is raised.
-  */
-interface Uint32Array {
-    /**
-      * The size in bytes of each element in the array.
-      */
-    readonly BYTES_PER_ELEMENT: number;
-
-    /**
-      * The ArrayBuffer instance referenced by the array.
-      */
-    readonly buffer: ArrayBufferLike;
-
-    /**
-      * The length in bytes of the array.
-      */
-    readonly byteLength: number;
-
-    /**
-      * The offset in bytes of the array.
-      */
-    readonly byteOffset: number;
-
-    /**
-      * Returns the this object after copying a section of the array identified by start and end
-      * to the same array starting at position target
-      * @param target If target is negative, it is treated as length+target where length is the
-      * length of the array.
-      * @param start If start is negative, it is treated as length+start. If end is negative, it
-      * is treated as length+end.
-      * @param end If not specified, length of the this object is used as its default value.
-      */
-    copyWithin(target: number, start: number, end?: number): this;
-
-    /**
-      * Determines whether all the members of an array satisfy the specified test.
-      * @param callbackfn A function that accepts up to three arguments. The every method calls
-      * the callbackfn function for each element in array1 until the callbackfn returns false,
-      * or until the end of the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    every(callbackfn: (value: number, index: number, array: Uint32Array) => boolean, thisArg?: any): boolean;
-
-    /**
-        * Returns the this object after filling the section identified by start and end with value
-        * @param value value to fill array section with
-        * @param start index to start filling the array at. If start is negative, it is treated as
-        * length+start where length is the length of the array.
-        * @param end index to stop filling the array at. If end is negative, it is treated as
-        * length+end.
-        */
-    fill(value: number, start?: number, end?: number): this;
-
-    /**
-      * Returns the elements of an array that meet the condition specified in a callback function.
-      * @param callbackfn A function that accepts up to three arguments. The filter method calls
-      * the callbackfn function one time for each element in the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    filter(callbackfn: (value: number, index: number, array: Uint32Array) => any, thisArg?: any): Uint32Array;
-
-    /**
-      * Returns the value of the first element in the array where predicate is true, and undefined
-      * otherwise.
-      * @param predicate find calls predicate once for each element of the array, in ascending
-      * order, until it finds one where predicate returns true. If such an element is found, find
-      * immediately returns that element value. Otherwise, find returns undefined.
-      * @param thisArg If provided, it will be used as the this value for each invocation of
-      * predicate. If it is not provided, undefined is used instead.
-      */
-    find(predicate: (value: number, index: number, obj: Uint32Array) => boolean, thisArg?: any): number | undefined;
-
-    /**
-      * Returns the index of the first element in the array where predicate is true, and -1
-      * otherwise.
-      * @param predicate find calls predicate once for each element of the array, in ascending
-      * order, until it finds one where predicate returns true. If such an element is found,
-      * findIndex immediately returns that element index. Otherwise, findIndex returns -1.
-      * @param thisArg If provided, it will be used as the this value for each invocation of
-      * predicate. If it is not provided, undefined is used instead.
-      */
-    findIndex(predicate: (value: number, index: number, obj: Uint32Array) => boolean, thisArg?: any): number;
-
-    /**
-      * Performs the specified action for each element in an array.
-      * @param callbackfn  A function that accepts up to three arguments. forEach calls the
-      * callbackfn function one time for each element in the array.
-      * @param thisArg  An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    forEach(callbackfn: (value: number, index: number, array: Uint32Array) => void, thisArg?: any): void;
-    /**
-      * Returns the index of the first occurrence of a value in an array.
-      * @param searchElement The value to locate in the array.
-      * @param fromIndex The array index at which to begin the search. If fromIndex is omitted, the
-      *  search starts at index 0.
-      */
-    indexOf(searchElement: number, fromIndex?: number): number;
-
-    /**
-      * Adds all the elements of an array separated by the specified separator string.
-      * @param separator A string used to separate one element of an array from the next in the
-      * resulting String. If omitted, the array elements are separated with a comma.
-      */
-    join(separator?: string): string;
-
-    /**
-      * Returns the index of the last occurrence of a value in an array.
-      * @param searchElement The value to locate in the array.
-      * @param fromIndex The array index at which to begin the search. If fromIndex is omitted, the
-      * search starts at index 0.
-      */
-    lastIndexOf(searchElement: number, fromIndex?: number): number;
-
-    /**
-      * The length of the array.
-      */
-    readonly length: number;
-
-    /**
-      * Calls a defined callback function on each element of an array, and returns an array that
-      * contains the results.
-      * @param callbackfn A function that accepts up to three arguments. The map method calls the
-      * callbackfn function one time for each element in the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    map(callbackfn: (value: number, index: number, array: Uint32Array) => number, thisArg?: any): Uint32Array;
-
-    /**
-      * Calls the specified callback function for all the elements in an array. The return value of
-      * the callback function is the accumulated result, and is provided as an argument in the next
-      * call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduce method calls the
-      * callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduce(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Uint32Array) => number): number;
-    reduce(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Uint32Array) => number, initialValue: number): number;
-
-    /**
-      * Calls the specified callback function for all the elements in an array. The return value of
-      * the callback function is the accumulated result, and is provided as an argument in the next
-      * call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduce method calls the
-      * callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduce<U>(callbackfn: (previousValue: U, currentValue: number, currentIndex: number, array: Uint32Array) => U, initialValue: U): U;
-
-    /**
-      * Calls the specified callback function for all the elements in an array, in descending order.
-      * The return value of the callback function is the accumulated result, and is provided as an
-      * argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduceRight method calls
-      * the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an
-      * argument instead of an array value.
-      */
-    reduceRight(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Uint32Array) => number): number;
-    reduceRight(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Uint32Array) => number, initialValue: number): number;
-
-    /**
-      * Calls the specified callback function for all the elements in an array, in descending order.
-      * The return value of the callback function is the accumulated result, and is provided as an
-      * argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduceRight method calls
-      * the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduceRight<U>(callbackfn: (previousValue: U, currentValue: number, currentIndex: number, array: Uint32Array) => U, initialValue: U): U;
-
-    /**
-      * Reverses the elements in an Array.
-      */
-    reverse(): Uint32Array;
-
-    /**
-      * Sets a value or an array of values.
-      * @param array A typed or untyped array of values to set.
-      * @param offset The index in the current array at which the values are to be written.
-      */
-    set(array: ArrayLike<number>, offset?: number): void;
-
-    /**
-      * Returns a section of an array.
-      * @param start The beginning of the specified portion of the array.
-      * @param end The end of the specified portion of the array.
-      */
-    slice(start?: number, end?: number): Uint32Array;
-
-    /**
-      * Determines whether the specified callback function returns true for any element of an array.
-      * @param callbackfn A function that accepts up to three arguments. The some method calls the
-      * callbackfn function for each element in array1 until the callbackfn returns true, or until
-      * the end of the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    some(callbackfn: (value: number, index: number, array: Uint32Array) => boolean, thisArg?: any): boolean;
-
-    /**
-      * Sorts an array.
-      * @param compareFn The name of the function used to determine the order of the elements. If
-      * omitted, the elements are sorted in ascending, ASCII character order.
-      */
-    sort(compareFn?: (a: number, b: number) => number): this;
-
-    /**
-      * Gets a new Uint32Array view of the ArrayBuffer store for this array, referencing the elements
-      * at begin, inclusive, up to end, exclusive.
-      * @param begin The index of the beginning of the array.
-      * @param end The index of the end of the array.
-      */
-    subarray(begin: number, end?: number): Uint32Array;
-
-    /**
-      * Converts a number to a string by using the current locale.
-      */
-    toLocaleString(): string;
-
-    /**
-      * Returns a string representation of an array.
-      */
-    toString(): string;
-
-    [index: number]: number;
-}
-
-interface Uint32ArrayConstructor {
-    readonly prototype: Uint32Array;
-    new(length: number): Uint32Array;
-    new(arrayOrArrayBuffer: ArrayLike<number> | ArrayBufferLike): Uint32Array;
-    new(buffer: ArrayBufferLike, byteOffset: number, length?: number): Uint32Array;
-
-    /**
-      * The size in bytes of each element in the array.
-      */
-    readonly BYTES_PER_ELEMENT: number;
-
-    /**
-      * Returns a new array from a set of elements.
-      * @param items A set of elements to include in the new array object.
-      */
-    of(...items: number[]): Uint32Array;
-
-    /**
-      * Creates an array from an array-like or iterable object.
-      * @param arrayLike An array-like or iterable object to convert to an array.
-      * @param mapfn A mapping function to call on every element of the array.
-      * @param thisArg Value of 'this' used to invoke the mapfn.
-      */
-    from(arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint32Array;
-
-}
-declare const Uint32Array: Uint32ArrayConstructor;
-
-/**
-  * A typed array of 32-bit float values. The contents are initialized to 0. If the requested number
-  * of bytes could not be allocated an exception is raised.
-  */
-interface Float32Array {
-    /**
-      * The size in bytes of each element in the array.
-      */
-    readonly BYTES_PER_ELEMENT: number;
-
-    /**
-      * The ArrayBuffer instance referenced by the array.
-      */
-    readonly buffer: ArrayBufferLike;
-
-    /**
-      * The length in bytes of the array.
-      */
-    readonly byteLength: number;
-
-    /**
-      * The offset in bytes of the array.
-      */
-    readonly byteOffset: number;
-
-    /**
-      * Returns the this object after copying a section of the array identified by start and end
-      * to the same array starting at position target
-      * @param target If target is negative, it is treated as length+target where length is the
-      * length of the array.
-      * @param start If start is negative, it is treated as length+start. If end is negative, it
-      * is treated as length+end.
-      * @param end If not specified, length of the this object is used as its default value.
-      */
-    copyWithin(target: number, start: number, end?: number): this;
-
-    /**
-      * Determines whether all the members of an array satisfy the specified test.
-      * @param callbackfn A function that accepts up to three arguments. The every method calls
-      * the callbackfn function for each element in array1 until the callbackfn returns false,
-      * or until the end of the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    every(callbackfn: (value: number, index: number, array: Float32Array) => boolean, thisArg?: any): boolean;
-
-    /**
-        * Returns the this object after filling the section identified by start and end with value
-        * @param value value to fill array section with
-        * @param start index to start filling the array at. If start is negative, it is treated as
-        * length+start where length is the length of the array.
-        * @param end index to stop filling the array at. If end is negative, it is treated as
-        * length+end.
-        */
-    fill(value: number, start?: number, end?: number): this;
-
-    /**
-      * Returns the elements of an array that meet the condition specified in a callback function.
-      * @param callbackfn A function that accepts up to three arguments. The filter method calls
-      * the callbackfn function one time for each element in the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    filter(callbackfn: (value: number, index: number, array: Float32Array) => any, thisArg?: any): Float32Array;
-
-    /**
-      * Returns the value of the first element in the array where predicate is true, and undefined
-      * otherwise.
-      * @param predicate find calls predicate once for each element of the array, in ascending
-      * order, until it finds one where predicate returns true. If such an element is found, find
-      * immediately returns that element value. Otherwise, find returns undefined.
-      * @param thisArg If provided, it will be used as the this value for each invocation of
-      * predicate. If it is not provided, undefined is used instead.
-      */
-    find(predicate: (value: number, index: number, obj: Float32Array) => boolean, thisArg?: any): number | undefined;
-
-    /**
-      * Returns the index of the first element in the array where predicate is true, and -1
-      * otherwise.
-      * @param predicate find calls predicate once for each element of the array, in ascending
-      * order, until it finds one where predicate returns true. If such an element is found,
-      * findIndex immediately returns that element index. Otherwise, findIndex returns -1.
-      * @param thisArg If provided, it will be used as the this value for each invocation of
-      * predicate. If it is not provided, undefined is used instead.
-      */
-    findIndex(predicate: (value: number, index: number, obj: Float32Array) => boolean, thisArg?: any): number;
-
-    /**
-      * Performs the specified action for each element in an array.
-      * @param callbackfn  A function that accepts up to three arguments. forEach calls the
-      * callbackfn function one time for each element in the array.
-      * @param thisArg  An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    forEach(callbackfn: (value: number, index: number, array: Float32Array) => void, thisArg?: any): void;
-
-    /**
-      * Returns the index of the first occurrence of a value in an array.
-      * @param searchElement The value to locate in the array.
-      * @param fromIndex The array index at which to begin the search. If fromIndex is omitted, the
-      *  search starts at index 0.
-      */
-    indexOf(searchElement: number, fromIndex?: number): number;
-
-    /**
-      * Adds all the elements of an array separated by the specified separator string.
-      * @param separator A string used to separate one element of an array from the next in the
-      * resulting String. If omitted, the array elements are separated with a comma.
-      */
-    join(separator?: string): string;
-
-    /**
-      * Returns the index of the last occurrence of a value in an array.
-      * @param searchElement The value to locate in the array.
-      * @param fromIndex The array index at which to begin the search. If fromIndex is omitted, the
-      * search starts at index 0.
-      */
-    lastIndexOf(searchElement: number, fromIndex?: number): number;
-
-    /**
-      * The length of the array.
-      */
-    readonly length: number;
-
-    /**
-      * Calls a defined callback function on each element of an array, and returns an array that
-      * contains the results.
-      * @param callbackfn A function that accepts up to three arguments. The map method calls the
-      * callbackfn function one time for each element in the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    map(callbackfn: (value: number, index: number, array: Float32Array) => number, thisArg?: any): Float32Array;
-
-    /**
-      * Calls the specified callback function for all the elements in an array. The return value of
-      * the callback function is the accumulated result, and is provided as an argument in the next
-      * call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduce method calls the
-      * callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduce(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Float32Array) => number): number;
-    reduce(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Float32Array) => number, initialValue: number): number;
-
-    /**
-      * Calls the specified callback function for all the elements in an array. The return value of
-      * the callback function is the accumulated result, and is provided as an argument in the next
-      * call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduce method calls the
-      * callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduce<U>(callbackfn: (previousValue: U, currentValue: number, currentIndex: number, array: Float32Array) => U, initialValue: U): U;
-
-    /**
-      * Calls the specified callback function for all the elements in an array, in descending order.
-      * The return value of the callback function is the accumulated result, and is provided as an
-      * argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduceRight method calls
-      * the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an
-      * argument instead of an array value.
-      */
-    reduceRight(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Float32Array) => number): number;
-    reduceRight(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Float32Array) => number, initialValue: number): number;
-
-    /**
-      * Calls the specified callback function for all the elements in an array, in descending order.
-      * The return value of the callback function is the accumulated result, and is provided as an
-      * argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduceRight method calls
-      * the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduceRight<U>(callbackfn: (previousValue: U, currentValue: number, currentIndex: number, array: Float32Array) => U, initialValue: U): U;
-
-    /**
-      * Reverses the elements in an Array.
-      */
-    reverse(): Float32Array;
-
-    /**
-      * Sets a value or an array of values.
-      * @param array A typed or untyped array of values to set.
-      * @param offset The index in the current array at which the values are to be written.
-      */
-    set(array: ArrayLike<number>, offset?: number): void;
-
-    /**
-      * Returns a section of an array.
-      * @param start The beginning of the specified portion of the array.
-      * @param end The end of the specified portion of the array.
-      */
-    slice(start?: number, end?: number): Float32Array;
-
-    /**
-      * Determines whether the specified callback function returns true for any element of an array.
-      * @param callbackfn A function that accepts up to three arguments. The some method calls the
-      * callbackfn function for each element in array1 until the callbackfn returns true, or until
-      * the end of the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    some(callbackfn: (value: number, index: number, array: Float32Array) => boolean, thisArg?: any): boolean;
-
-    /**
-      * Sorts an array.
-      * @param compareFn The name of the function used to determine the order of the elements. If
-      * omitted, the elements are sorted in ascending, ASCII character order.
-      */
-    sort(compareFn?: (a: number, b: number) => number): this;
-
-    /**
-      * Gets a new Float32Array view of the ArrayBuffer store for this array, referencing the elements
-      * at begin, inclusive, up to end, exclusive.
-      * @param begin The index of the beginning of the array.
-      * @param end The index of the end of the array.
-      */
-    subarray(begin: number, end?: number): Float32Array;
-
-    /**
-      * Converts a number to a string by using the current locale.
-      */
-    toLocaleString(): string;
-
-    /**
-      * Returns a string representation of an array.
-      */
-    toString(): string;
-
-    [index: number]: number;
-}
-
-interface Float32ArrayConstructor {
-    readonly prototype: Float32Array;
-    new(length: number): Float32Array;
-    new(arrayOrArrayBuffer: ArrayLike<number> | ArrayBufferLike): Float32Array;
-    new(buffer: ArrayBufferLike, byteOffset: number, length?: number): Float32Array;
-
-    /**
-      * The size in bytes of each element in the array.
-      */
-    readonly BYTES_PER_ELEMENT: number;
-
-    /**
-      * Returns a new array from a set of elements.
-      * @param items A set of elements to include in the new array object.
-      */
-    of(...items: number[]): Float32Array;
-
-    /**
-      * Creates an array from an array-like or iterable object.
-      * @param arrayLike An array-like or iterable object to convert to an array.
-      * @param mapfn A mapping function to call on every element of the array.
-      * @param thisArg Value of 'this' used to invoke the mapfn.
-      */
-    from(arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Float32Array;
-
-
-}
-declare const Float32Array: Float32ArrayConstructor;
-
-/**
-  * A typed array of 64-bit float values. The contents are initialized to 0. If the requested
-  * number of bytes could not be allocated an exception is raised.
-  */
-interface Float64Array {
-    /**
-      * The size in bytes of each element in the array.
-      */
-    readonly BYTES_PER_ELEMENT: number;
-
-    /**
-      * The ArrayBuffer instance referenced by the array.
-      */
-    readonly buffer: ArrayBufferLike;
-
-    /**
-      * The length in bytes of the array.
-      */
-    readonly byteLength: number;
-
-    /**
-      * The offset in bytes of the array.
-      */
-    readonly byteOffset: number;
-
-    /**
-      * Returns the this object after copying a section of the array identified by start and end
-      * to the same array starting at position target
-      * @param target If target is negative, it is treated as length+target where length is the
-      * length of the array.
-      * @param start If start is negative, it is treated as length+start. If end is negative, it
-      * is treated as length+end.
-      * @param end If not specified, length of the this object is used as its default value.
-      */
-    copyWithin(target: number, start: number, end?: number): this;
-
-    /**
-      * Determines whether all the members of an array satisfy the specified test.
-      * @param callbackfn A function that accepts up to three arguments. The every method calls
-      * the callbackfn function for each element in array1 until the callbackfn returns false,
-      * or until the end of the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    every(callbackfn: (value: number, index: number, array: Float64Array) => boolean, thisArg?: any): boolean;
-
-    /**
-        * Returns the this object after filling the section identified by start and end with value
-        * @param value value to fill array section with
-        * @param start index to start filling the array at. If start is negative, it is treated as
-        * length+start where length is the length of the array.
-        * @param end index to stop filling the array at. If end is negative, it is treated as
-        * length+end.
-        */
-    fill(value: number, start?: number, end?: number): this;
-
-    /**
-      * Returns the elements of an array that meet the condition specified in a callback function.
-      * @param callbackfn A function that accepts up to three arguments. The filter method calls
-      * the callbackfn function one time for each element in the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    filter(callbackfn: (value: number, index: number, array: Float64Array) => any, thisArg?: any): Float64Array;
-
-    /**
-      * Returns the value of the first element in the array where predicate is true, and undefined
-      * otherwise.
-      * @param predicate find calls predicate once for each element of the array, in ascending
-      * order, until it finds one where predicate returns true. If such an element is found, find
-      * immediately returns that element value. Otherwise, find returns undefined.
-      * @param thisArg If provided, it will be used as the this value for each invocation of
-      * predicate. If it is not provided, undefined is used instead.
-      */
-    find(predicate: (value: number, index: number, obj: Float64Array) => boolean, thisArg?: any): number | undefined;
-
-    /**
-      * Returns the index of the first element in the array where predicate is true, and -1
-      * otherwise.
-      * @param predicate find calls predicate once for each element of the array, in ascending
-      * order, until it finds one where predicate returns true. If such an element is found,
-      * findIndex immediately returns that element index. Otherwise, findIndex returns -1.
-      * @param thisArg If provided, it will be used as the this value for each invocation of
-      * predicate. If it is not provided, undefined is used instead.
-      */
-    findIndex(predicate: (value: number, index: number, obj: Float64Array) => boolean, thisArg?: any): number;
-
-    /**
-      * Performs the specified action for each element in an array.
-      * @param callbackfn  A function that accepts up to three arguments. forEach calls the
-      * callbackfn function one time for each element in the array.
-      * @param thisArg  An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    forEach(callbackfn: (value: number, index: number, array: Float64Array) => void, thisArg?: any): void;
-
-    /**
-      * Returns the index of the first occurrence of a value in an array.
-      * @param searchElement The value to locate in the array.
-      * @param fromIndex The array index at which to begin the search. If fromIndex is omitted, the
-      *  search starts at index 0.
-      */
-    indexOf(searchElement: number, fromIndex?: number): number;
-
-    /**
-      * Adds all the elements of an array separated by the specified separator string.
-      * @param separator A string used to separate one element of an array from the next in the
-      * resulting String. If omitted, the array elements are separated with a comma.
-      */
-    join(separator?: string): string;
-
-    /**
-      * Returns the index of the last occurrence of a value in an array.
-      * @param searchElement The value to locate in the array.
-      * @param fromIndex The array index at which to begin the search. If fromIndex is omitted, the
-      * search starts at index 0.
-      */
-    lastIndexOf(searchElement: number, fromIndex?: number): number;
-
-    /**
-      * The length of the array.
-      */
-    readonly length: number;
-
-    /**
-      * Calls a defined callback function on each element of an array, and returns an array that
-      * contains the results.
-      * @param callbackfn A function that accepts up to three arguments. The map method calls the
-      * callbackfn function one time for each element in the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    map(callbackfn: (value: number, index: number, array: Float64Array) => number, thisArg?: any): Float64Array;
-
-    /**
-      * Calls the specified callback function for all the elements in an array. The return value of
-      * the callback function is the accumulated result, and is provided as an argument in the next
-      * call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduce method calls the
-      * callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduce(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Float64Array) => number): number;
-    reduce(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Float64Array) => number, initialValue: number): number;
-
-    /**
-      * Calls the specified callback function for all the elements in an array. The return value of
-      * the callback function is the accumulated result, and is provided as an argument in the next
-      * call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduce method calls the
-      * callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduce<U>(callbackfn: (previousValue: U, currentValue: number, currentIndex: number, array: Float64Array) => U, initialValue: U): U;
-
-    /**
-      * Calls the specified callback function for all the elements in an array, in descending order.
-      * The return value of the callback function is the accumulated result, and is provided as an
-      * argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduceRight method calls
-      * the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an
-      * argument instead of an array value.
-      */
-    reduceRight(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Float64Array) => number): number;
-    reduceRight(callbackfn: (previousValue: number, currentValue: number, currentIndex: number, array: Float64Array) => number, initialValue: number): number;
-
-    /**
-      * Calls the specified callback function for all the elements in an array, in descending order.
-      * The return value of the callback function is the accumulated result, and is provided as an
-      * argument in the next call to the callback function.
-      * @param callbackfn A function that accepts up to four arguments. The reduceRight method calls
-      * the callbackfn function one time for each element in the array.
-      * @param initialValue If initialValue is specified, it is used as the initial value to start
-      * the accumulation. The first call to the callbackfn function provides this value as an argument
-      * instead of an array value.
-      */
-    reduceRight<U>(callbackfn: (previousValue: U, currentValue: number, currentIndex: number, array: Float64Array) => U, initialValue: U): U;
-
-    /**
-      * Reverses the elements in an Array.
-      */
-    reverse(): Float64Array;
-
-    /**
-      * Sets a value or an array of values.
-      * @param array A typed or untyped array of values to set.
-      * @param offset The index in the current array at which the values are to be written.
-      */
-    set(array: ArrayLike<number>, offset?: number): void;
-
-    /**
-      * Returns a section of an array.
-      * @param start The beginning of the specified portion of the array.
-      * @param end The end of the specified portion of the array.
-      */
-    slice(start?: number, end?: number): Float64Array;
-
-    /**
-      * Determines whether the specified callback function returns true for any element of an array.
-      * @param callbackfn A function that accepts up to three arguments. The some method calls the
-      * callbackfn function for each element in array1 until the callbackfn returns true, or until
-      * the end of the array.
-      * @param thisArg An object to which the this keyword can refer in the callbackfn function.
-      * If thisArg is omitted, undefined is used as the this value.
-      */
-    some(callbackfn: (value: number, index: number, array: Float64Array) => boolean, thisArg?: any): boolean;
-
-    /**
-      * Sorts an array.
-      * @param compareFn The name of the function used to determine the order of the elements. If
-      * omitted, the elements are sorted in ascending, ASCII character order.
-      */
-    sort(compareFn?: (a: number, b: number) => number): this;
-
-    /**
-      * Gets a new Float64Array view of the ArrayBuffer store for this array, referencing the elements
-      * at begin, inclusive, up to end, exclusive.
-      * @param begin The index of the beginning of the array.
-      * @param end The index of the end of the array.
-      */
-    subarray(begin: number, end?: number): Float64Array;
-
-    /**
-      * Converts a number to a string by using the current locale.
-      */
-    toLocaleString(): string;
-
-    /**
-      * Returns a string representation of an array.
-      */
-    toString(): string;
-
-    [index: number]: number;
-}
-
-interface Float64ArrayConstructor {
-    readonly prototype: Float64Array;
-    new(length: number): Float64Array;
-    new(arrayOrArrayBuffer: ArrayLike<number> | ArrayBufferLike): Float64Array;
-    new(buffer: ArrayBufferLike, byteOffset: number, length?: number): Float64Array;
-
-    /**
-      * The size in bytes of each element in the array.
-      */
-    readonly BYTES_PER_ELEMENT: number;
-
-    /**
-      * Returns a new array from a set of elements.
-      * @param items A set of elements to include in the new array object.
-      */
-    of(...items: number[]): Float64Array;
-
-    /**
-      * Creates an array from an array-like or iterable object.
-      * @param arrayLike An array-like or iterable object to convert to an array.
-      * @param mapfn A mapping function to call on every element of the array.
-      * @param thisArg Value of 'this' used to invoke the mapfn.
-      */
-    from(arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Float64Array;
-
-}
-declare const Float64Array: Float64ArrayConstructor;
-
-/////////////////////////////
-/// ECMAScript Internationalization API
-/////////////////////////////
-
-declare namespace Intl {
-    interface CollatorOptions {
-        usage?: string;
-        localeMatcher?: string;
-        numeric?: boolean;
-        caseFirst?: string;
-        sensitivity?: string;
-        ignorePunctuation?: boolean;
-    }
-
-    interface ResolvedCollatorOptions {
-        locale: string;
-        usage: string;
-        sensitivity: string;
-        ignorePunctuation: boolean;
-        collation: string;
-        caseFirst: string;
-        numeric: boolean;
-    }
-
-    interface Collator {
-        compare(x: string, y: string): number;
-        resolvedOptions(): ResolvedCollatorOptions;
-    }
-    var Collator: {
-        new(locales?: string | string[], options?: CollatorOptions): Collator;
-        (locales?: string | string[], options?: CollatorOptions): Collator;
-        supportedLocalesOf(locales: string | string[], options?: CollatorOptions): string[];
-    };
-
-    interface NumberFormatOptions {
-        localeMatcher?: string;
-        style?: string;
-        currency?: string;
-        currencyDisplay?: string;
-        useGrouping?: boolean;
-        minimumIntegerDigits?: number;
-        minimumFractionDigits?: number;
-        maximumFractionDigits?: number;
-        minimumSignificantDigits?: number;
-        maximumSignificantDigits?: number;
-    }
-
-    interface ResolvedNumberFormatOptions {
-        locale: string;
-        numberingSystem: string;
-        style: string;
-        currency?: string;
-        currencyDisplay?: string;
-        minimumIntegerDigits: number;
-        minimumFractionDigits: number;
-        maximumFractionDigits: number;
-        minimumSignificantDigits?: number;
-        maximumSignificantDigits?: number;
-        useGrouping: boolean;
-    }
-
-    interface NumberFormat {
-        format(value: number): string;
-        resolvedOptions(): ResolvedNumberFormatOptions;
-    }
-    var NumberFormat: {
-        new(locales?: string | string[], options?: NumberFormatOptions): NumberFormat;
-        (locales?: string | string[], options?: NumberFormatOptions): NumberFormat;
-        supportedLocalesOf(locales: string | string[], options?: NumberFormatOptions): string[];
-    };
-
-    interface DateTimeFormatOptions {
-        localeMatcher?: string;
-        weekday?: string;
-        era?: string;
-        year?: string;
-        month?: string;
-        day?: string;
-        hour?: string;
-        minute?: string;
-        second?: string;
-        timeZoneName?: string;
-        formatMatcher?: string;
-        hour12?: boolean;
-        timeZone?: string;
-    }
-
-    interface ResolvedDateTimeFormatOptions {
-        locale: string;
-        calendar: string;
-        numberingSystem: string;
-        timeZone: string;
-        hour12?: boolean;
-        weekday?: string;
-        era?: string;
-        year?: string;
-        month?: string;
-        day?: string;
-        hour?: string;
-        minute?: string;
-        second?: string;
-        timeZoneName?: string;
-    }
-
-    interface DateTimeFormat {
-        format(date?: Date | number): string;
-        resolvedOptions(): ResolvedDateTimeFormatOptions;
-    }
-    var DateTimeFormat: {
-        new(locales?: string | string[], options?: DateTimeFormatOptions): DateTimeFormat;
-        (locales?: string | string[], options?: DateTimeFormatOptions): DateTimeFormat;
-        supportedLocalesOf(locales: string | string[], options?: DateTimeFormatOptions): string[];
-    };
-}
-
-interface String {
-    /**
-      * Determines whether two strings are equivalent in the current or specified locale.
-      * @param that String to compare to target string
-      * @param locales A locale string or array of locale strings that contain one or more language or locale tags. If you include more than one locale string, list them in descending order of priority so that the first entry is the preferred locale. If you omit this parameter, the default locale of the JavaScript runtime is used. This parameter must conform to BCP 47 standards; see the Intl.Collator object for details.
-      * @param options An object that contains one or more properties that specify comparison options. see the Intl.Collator object for details.
-      */
-    localeCompare(that: string, locales?: string | string[], options?: Intl.CollatorOptions): number;
-}
-
-interface Number {
-    /**
-      * Converts a number to a string by using the current or specified locale.
-      * @param locales A locale string or array of locale strings that contain one or more language or locale tags. If you include more than one locale string, list them in descending order of priority so that the first entry is the preferred locale. If you omit this parameter, the default locale of the JavaScript runtime is used.
-      * @param options An object that contains one or more properties that specify comparison options.
-      */
-    toLocaleString(locales?: string | string[], options?: Intl.NumberFormatOptions): string;
-}
-
-interface Date {
-    /**
-      * Converts a date and time to a string by using the current or specified locale.
-      * @param locales A locale string or array of locale strings that contain one or more language or locale tags. If you include more than one locale string, list them in descending order of priority so that the first entry is the preferred locale. If you omit this parameter, the default locale of the JavaScript runtime is used.
-      * @param options An object that contains one or more properties that specify comparison options.
-      */
-    toLocaleString(locales?: string | string[], options?: Intl.DateTimeFormatOptions): string;
-    /**
-      * Converts a date to a string by using the current or specified locale.
-      * @param locales A locale string or array of locale strings that contain one or more language or locale tags. If you include more than one locale string, list them in descending order of priority so that the first entry is the preferred locale. If you omit this parameter, the default locale of the JavaScript runtime is used.
-      * @param options An object that contains one or more properties that specify comparison options.
-      */
-    toLocaleDateString(locales?: string | string[], options?: Intl.DateTimeFormatOptions): string;
-
-    /**
-      * Converts a time to a string by using the current or specified locale.
-      * @param locales A locale string or array of locale strings that contain one or more language or locale tags. If you include more than one locale string, list them in descending order of priority so that the first entry is the preferred locale. If you omit this parameter, the default locale of the JavaScript runtime is used.
-      * @param options An object that contains one or more properties that specify comparison options.
-      */
-    toLocaleTimeString(locales?: string | string[], options?: Intl.DateTimeFormatOptions): string;
-}
-
-
-interface Array<T> {
-    /**
-     * Returns the value of the first element in the array where predicate is true, and undefined
-     * otherwise.
-     * @param predicate find calls predicate once for each element of the array, in ascending
-     * order, until it finds one where predicate returns true. If such an element is found, find
-     * immediately returns that element value. Otherwise, find returns undefined.
-     * @param thisArg If provided, it will be used as the this value for each invocation of
-     * predicate. If it is not provided, undefined is used instead.
-     */
-    find<S extends T>(predicate: (this: void, value: T, index: number, obj: T[]) => value is S, thisArg?: any): S | undefined;
-    find(predicate: (value: T, index: number, obj: T[]) => boolean, thisArg?: any): T | undefined;
-
-    /**
-     * Returns the index of the first element in the array where predicate is true, and -1
-     * otherwise.
-     * @param predicate find calls predicate once for each element of the array, in ascending
-     * order, until it finds one where predicate returns true. If such an element is found,
-     * findIndex immediately returns that element index. Otherwise, findIndex returns -1.
-     * @param thisArg If provided, it will be used as the this value for each invocation of
-     * predicate. If it is not provided, undefined is used instead.
-     */
-    findIndex(predicate: (value: T, index: number, obj: T[]) => boolean, thisArg?: any): number;
-
-    /**
-     * Returns the this object after filling the section identified by start and end with value
-     * @param value value to fill array section with
-     * @param start index to start filling the array at. If start is negative, it is treated as
-     * length+start where length is the length of the array.
-     * @param end index to stop filling the array at. If end is negative, it is treated as
-     * length+end.
-     */
-    fill(value: T, start?: number, end?: number): this;
-
-    /**
-     * Returns the this object after copying a section of the array identified by start and end
-     * to the same array starting at position target
-     * @param target If target is negative, it is treated as length+target where length is the
-     * length of the array.
-     * @param start If start is negative, it is treated as length+start. If end is negative, it
-     * is treated as length+end.
-     * @param end If not specified, length of the this object is used as its default value.
-     */
-    copyWithin(target: number, start: number, end?: number): this;
-}
-
-interface ArrayConstructor {
-    /**
-     * Creates an array from an array-like object.
-     * @param arrayLike An array-like object to convert to an array.
-     */
-    from<T>(arrayLike: ArrayLike<T>): T[];
-
-    /**
-     * Creates an array from an iterable object.
-     * @param arrayLike An array-like object to convert to an array.
-     * @param mapfn A mapping function to call on every element of the array.
-     * @param thisArg Value of 'this' used to invoke the mapfn.
-     */
-    from<T, U>(arrayLike: ArrayLike<T>, mapfn: (v: T, k: number) => U, thisArg?: any): U[];
-
-    /**
-     * Returns a new array from a set of elements.
-     * @param items A set of elements to include in the new array object.
-     */
-    of<T>(...items: T[]): T[];
-}
-
-interface DateConstructor {
-    new (value: number | string | Date): Date;
-}
-
-interface Function {
-    /**
-     * Returns the name of the function. Function names are read-only and can not be changed.
-     */
-    readonly name: string;
-}
-
-interface Math {
-    /**
-     * Returns the number of leading zero bits in the 32-bit binary representation of a number.
-     * @param x A numeric expression.
-     */
-    clz32(x: number): number;
-
-    /**
-     * Returns the result of 32-bit multiplication of two numbers.
-     * @param x First number
-     * @param y Second number
-     */
-    imul(x: number, y: number): number;
-
-    /**
-     * Returns the sign of the x, indicating whether x is positive, negative or zero.
-     * @param x The numeric expression to test
-     */
-    sign(x: number): number;
-
-    /**
-     * Returns the base 10 logarithm of a number.
-     * @param x A numeric expression.
-     */
-    log10(x: number): number;
-
-    /**
-     * Returns the base 2 logarithm of a number.
-     * @param x A numeric expression.
-     */
-    log2(x: number): number;
-
-    /**
-     * Returns the natural logarithm of 1 + x.
-     * @param x A numeric expression.
-     */
-    log1p(x: number): number;
-
-    /**
-     * Returns the result of (e^x - 1), which is an implementation-dependent approximation to
-     * subtracting 1 from the exponential function of x (e raised to the power of x, where e
-     * is the base of the natural logarithms).
-     * @param x A numeric expression.
-     */
-    expm1(x: number): number;
-
-    /**
-     * Returns the hyperbolic cosine of a number.
-     * @param x A numeric expression that contains an angle measured in radians.
-     */
-    cosh(x: number): number;
-
-    /**
-     * Returns the hyperbolic sine of a number.
-     * @param x A numeric expression that contains an angle measured in radians.
-     */
-    sinh(x: number): number;
-
-    /**
-     * Returns the hyperbolic tangent of a number.
-     * @param x A numeric expression that contains an angle measured in radians.
-     */
-    tanh(x: number): number;
-
-    /**
-     * Returns the inverse hyperbolic cosine of a number.
-     * @param x A numeric expression that contains an angle measured in radians.
-     */
-    acosh(x: number): number;
-
-    /**
-     * Returns the inverse hyperbolic sine of a number.
-     * @param x A numeric expression that contains an angle measured in radians.
-     */
-    asinh(x: number): number;
-
-    /**
-     * Returns the inverse hyperbolic tangent of a number.
-     * @param x A numeric expression that contains an angle measured in radians.
-     */
-    atanh(x: number): number;
-
-    /**
-     * Returns the square root of the sum of squares of its arguments.
-     * @param values Values to compute the square root for.
-     *     If no arguments are passed, the result is +0.
-     *     If there is only one argument, the result is the absolute value.
-     *     If any argument is +Infinity or -Infinity, the result is +Infinity.
-     *     If any argument is NaN, the result is NaN.
-     *     If all arguments are either +0 or −0, the result is +0.
-     */
-    hypot(...values: number[]): number;
-
-    /**
-     * Returns the integral part of the a numeric expression, x, removing any fractional digits.
-     * If x is already an integer, the result is x.
-     * @param x A numeric expression.
-     */
-    trunc(x: number): number;
-
-    /**
-     * Returns the nearest single precision float representation of a number.
-     * @param x A numeric expression.
-     */
-    fround(x: number): number;
-
-    /**
-     * Returns an implementation-dependent approximation to the cube root of number.
-     * @param x A numeric expression.
-     */
-    cbrt(x: number): number;
-}
-
-interface NumberConstructor {
-    /**
-     * The value of Number.EPSILON is the difference between 1 and the smallest value greater than 1
-     * that is representable as a Number value, which is approximately:
-     * 2.2204460492503130808472633361816 x 10‍−‍16.
-     */
-    readonly EPSILON: number;
-
-    /**
-     * Returns true if passed value is finite.
-     * Unlike the global isFinite, Number.isFinite doesn't forcibly convert the parameter to a
-     * number. Only finite values of the type number, result in true.
-     * @param number A numeric value.
-     */
-    isFinite(number: number): boolean;
-
-    /**
-     * Returns true if the value passed is an integer, false otherwise.
-     * @param number A numeric value.
-     */
-    isInteger(number: number): boolean;
-
-    /**
-     * Returns a Boolean value that indicates whether a value is the reserved value NaN (not a
-     * number). Unlike the global isNaN(), Number.isNaN() doesn't forcefully convert the parameter
-     * to a number. Only values of the type number, that are also NaN, result in true.
-     * @param number A numeric value.
-     */
-    isNaN(number: number): boolean;
-
-    /**
-     * Returns true if the value passed is a safe integer.
-     * @param number A numeric value.
-     */
-    isSafeInteger(number: number): boolean;
-
-    /**
-     * The value of the largest integer n such that n and n + 1 are both exactly representable as
-     * a Number value.
-     * The value of Number.MAX_SAFE_INTEGER is 9007199254740991 2^53 − 1.
-     */
-    readonly MAX_SAFE_INTEGER: number;
-
-    /**
-     * The value of the smallest integer n such that n and n − 1 are both exactly representable as
-     * a Number value.
-     * The value of Number.MIN_SAFE_INTEGER is −9007199254740991 (−(2^53 − 1)).
-     */
-    readonly MIN_SAFE_INTEGER: number;
-
-    /**
-     * Converts a string to a floating-point number.
-     * @param string A string that contains a floating-point number.
-     */
-    parseFloat(string: string): number;
-
-    /**
-     * Converts A string to an integer.
-     * @param s A string to convert into a number.
-     * @param radix A value between 2 and 36 that specifies the base of the number in numString.
-     * If this argument is not supplied, strings with a prefix of '0x' are considered hexadecimal.
-     * All other strings are considered decimal.
-     */
-    parseInt(string: string, radix?: number): number;
-}
-
-interface ObjectConstructor {
-    /**
-     * Copy the values of all of the enumerable own properties from one or more source objects to a
-     * target object. Returns the target object.
-     * @param target The target object to copy to.
-     * @param source The source object from which to copy properties.
-     */
-    assign<T, U>(target: T, source: U): T & U;
-
-    /**
-     * Copy the values of all of the enumerable own properties from one or more source objects to a
-     * target object. Returns the target object.
-     * @param target The target object to copy to.
-     * @param source1 The first source object from which to copy properties.
-     * @param source2 The second source object from which to copy properties.
-     */
-    assign<T, U, V>(target: T, source1: U, source2: V): T & U & V;
-
-    /**
-     * Copy the values of all of the enumerable own properties from one or more source objects to a
-     * target object. Returns the target object.
-     * @param target The target object to copy to.
-     * @param source1 The first source object from which to copy properties.
-     * @param source2 The second source object from which to copy properties.
-     * @param source3 The third source object from which to copy properties.
-     */
-    assign<T, U, V, W>(target: T, source1: U, source2: V, source3: W): T & U & V & W;
-
-    /**
-     * Copy the values of all of the enumerable own properties from one or more source objects to a
-     * target object. Returns the target object.
-     * @param target The target object to copy to.
-     * @param sources One or more source objects from which to copy properties
-     */
-    assign(target: object, ...sources: any[]): any;
-
-    /**
-     * Returns an array of all symbol properties found directly on object o.
-     * @param o Object to retrieve the symbols from.
-     */
-    getOwnPropertySymbols(o: any): symbol[];
-
-    /**
-     * Returns true if the values are the same value, false otherwise.
-     * @param value1 The first value.
-     * @param value2 The second value.
-     */
-    is(value1: any, value2: any): boolean;
-
-    /**
-     * Sets the prototype of a specified object o to  object proto or null. Returns the object o.
-     * @param o The object to change its prototype.
-     * @param proto The value of the new prototype or null.
-     */
-    setPrototypeOf(o: any, proto: object | null): any;
-}
-
-interface ReadonlyArray<T> {
-    /**
-     * Returns the value of the first element in the array where predicate is true, and undefined
-     * otherwise.
-     * @param predicate find calls predicate once for each element of the array, in ascending
-     * order, until it finds one where predicate returns true. If such an element is found, find
-     * immediately returns that element value. Otherwise, find returns undefined.
-     * @param thisArg If provided, it will be used as the this value for each invocation of
-     * predicate. If it is not provided, undefined is used instead.
-     */
-    find<S extends T>(predicate: (this: void, value: T, index: number, obj: ReadonlyArray<T>) => value is S, thisArg?: any): S | undefined;
-    find(predicate: (value: T, index: number, obj: ReadonlyArray<T>) => boolean, thisArg?: any): T | undefined;
-
-    /**
-     * Returns the index of the first element in the array where predicate is true, and -1
-     * otherwise.
-     * @param predicate find calls predicate once for each element of the array, in ascending
-     * order, until it finds one where predicate returns true. If such an element is found,
-     * findIndex immediately returns that element index. Otherwise, findIndex returns -1.
-     * @param thisArg If provided, it will be used as the this value for each invocation of
-     * predicate. If it is not provided, undefined is used instead.
-     */
-    findIndex(predicate: (value: T, index: number, obj: ReadonlyArray<T>) => boolean, thisArg?: any): number;
-}
-
-interface RegExp {
-    /**
-     * Returns a string indicating the flags of the regular expression in question. This field is read-only.
-     * The characters in this string are sequenced and concatenated in the following order:
-     *
-     *    - "g" for global
-     *    - "i" for ignoreCase
-     *    - "m" for multiline
-     *    - "u" for unicode
-     *    - "y" for sticky
-     *
-     * If no flags are set, the value is the empty string.
-     */
-    readonly flags: string;
-
-    /**
-     * Returns a Boolean value indicating the state of the sticky flag (y) used with a regular
-     * expression. Default is false. Read-only.
-     */
-    readonly sticky: boolean;
-
-    /**
-     * Returns a Boolean value indicating the state of the Unicode flag (u) used with a regular
-     * expression. Default is false. Read-only.
-     */
-    readonly unicode: boolean;
-}
-
-interface RegExpConstructor {
-    new (pattern: RegExp, flags?: string): RegExp;
-    (pattern: RegExp, flags?: string): RegExp;
-}
-
-interface String {
-    /**
-     * Returns a nonnegative integer Number less than 1114112 (0x110000) that is the code point
-     * value of the UTF-16 encoded code point starting at the string element at position pos in
-     * the String resulting from converting this object to a String.
-     * If there is no element at that position, the result is undefined.
-     * If a valid UTF-16 surrogate pair does not begin at pos, the result is the code unit at pos.
-     */
-    codePointAt(pos: number): number | undefined;
-
-    /**
-     * Returns true if searchString appears as a substring of the result of converting this
-     * object to a String, at one or more positions that are
-     * greater than or equal to position; otherwise, returns false.
-     * @param searchString search string
-     * @param position If position is undefined, 0 is assumed, so as to search all of the String.
-     */
-    includes(searchString: string, position?: number): boolean;
-
-    /**
-     * Returns true if the sequence of elements of searchString converted to a String is the
-     * same as the corresponding elements of this object (converted to a String) starting at
-     * endPosition – length(this). Otherwise returns false.
-     */
-    endsWith(searchString: string, endPosition?: number): boolean;
-
-    /**
-     * Returns the String value result of normalizing the string into the normalization form
-     * named by form as specified in Unicode Standard Annex #15, Unicode Normalization Forms.
-     * @param form Applicable values: "NFC", "NFD", "NFKC", or "NFKD", If not specified default
-     * is "NFC"
-     */
-    normalize(form: "NFC" | "NFD" | "NFKC" | "NFKD"): string;
-
-    /**
-     * Returns the String value result of normalizing the string into the normalization form
-     * named by form as specified in Unicode Standard Annex #15, Unicode Normalization Forms.
-     * @param form Applicable values: "NFC", "NFD", "NFKC", or "NFKD", If not specified default
-     * is "NFC"
-     */
-    normalize(form?: string): string;
-
-    /**
-     * Returns a String value that is made from count copies appended together. If count is 0,
-     * the empty string is returned.
-     * @param count number of copies to append
-     */
-    repeat(count: number): string;
-
-    /**
-     * Returns true if the sequence of elements of searchString converted to a String is the
-     * same as the corresponding elements of this object (converted to a String) starting at
-     * position. Otherwise returns false.
-     */
-    startsWith(searchString: string, position?: number): boolean;
-
-    /**
-     * Returns an <a> HTML anchor element and sets the name attribute to the text value
-     * @param name
-     */
-    anchor(name: string): string;
-
-    /** Returns a <big> HTML element */
-    big(): string;
-
-    /** Returns a <blink> HTML element */
-    blink(): string;
-
-    /** Returns a <b> HTML element */
-    bold(): string;
-
-    /** Returns a <tt> HTML element */
-    fixed(): string;
-
-    /** Returns a <font> HTML element and sets the color attribute value */
-    fontcolor(color: string): string;
-
-    /** Returns a <font> HTML element and sets the size attribute value */
-    fontsize(size: number): string;
-
-    /** Returns a <font> HTML element and sets the size attribute value */
-    fontsize(size: string): string;
-
-    /** Returns an <i> HTML element */
-    italics(): string;
-
-    /** Returns an <a> HTML element and sets the href attribute value */
-    link(url: string): string;
-
-    /** Returns a <small> HTML element */
-    small(): string;
-
-    /** Returns a <strike> HTML element */
-    strike(): string;
-
-    /** Returns a <sub> HTML element */
-    sub(): string;
-
-    /** Returns a <sup> HTML element */
-    sup(): string;
-}
-
-interface StringConstructor {
-    /**
-     * Return the String value whose elements are, in order, the elements in the List elements.
-     * If length is 0, the empty string is returned.
-     */
-    fromCodePoint(...codePoints: number[]): string;
-
-    /**
-     * String.raw is intended for use as a tag function of a Tagged Template String. When called
-     * as such the first argument will be a well formed template call site object and the rest
-     * parameter will contain the substitution values.
-     * @param template A well-formed template string call site representation.
-     * @param substitutions A set of substitution values.
-     */
-    raw(template: TemplateStringsArray, ...substitutions: any[]): string;
-}
-
-
-interface Map<K, V> {
-    clear(): void;
-    delete(key: K): boolean;
-    forEach(callbackfn: (value: V, key: K, map: Map<K, V>) => void, thisArg?: any): void;
-    get(key: K): V | undefined;
-    has(key: K): boolean;
-    set(key: K, value: V): this;
-    readonly size: number;
-}
-
-interface MapConstructor {
-    new (): Map<any, any>;
-    new <K, V>(entries?: ReadonlyArray<[K, V]> | null): Map<K, V>;
-    readonly prototype: Map<any, any>;
-}
-declare var Map: MapConstructor;
-
-interface ReadonlyMap<K, V> {
-    forEach(callbackfn: (value: V, key: K, map: ReadonlyMap<K, V>) => void, thisArg?: any): void;
-    get(key: K): V | undefined;
-    has(key: K): boolean;
-    readonly size: number;
-}
-
-interface WeakMap<K extends object, V> {
-    delete(key: K): boolean;
-    get(key: K): V | undefined;
-    has(key: K): boolean;
-    set(key: K, value: V): this;
-}
-
-interface WeakMapConstructor {
-    new (): WeakMap<object, any>;
-    new <K extends object, V>(entries?: ReadonlyArray<[K, V]> | null): WeakMap<K, V>;
-    readonly prototype: WeakMap<object, any>;
-}
-declare var WeakMap: WeakMapConstructor;
-
-interface Set<T> {
-    add(value: T): this;
-    clear(): void;
-    delete(value: T): boolean;
-    forEach(callbackfn: (value: T, value2: T, set: Set<T>) => void, thisArg?: any): void;
-    has(value: T): boolean;
-    readonly size: number;
-}
-
-interface SetConstructor {
-    new (): Set<any>;
-    new <T>(values?: ReadonlyArray<T> | null): Set<T>;
-    readonly prototype: Set<any>;
-}
-declare var Set: SetConstructor;
-
-interface ReadonlySet<T> {
-    forEach(callbackfn: (value: T, value2: T, set: ReadonlySet<T>) => void, thisArg?: any): void;
-    has(value: T): boolean;
-    readonly size: number;
-}
-
-interface WeakSet<T extends object> {
-    add(value: T): this;
-    delete(value: T): boolean;
-    has(value: T): boolean;
-}
-
-interface WeakSetConstructor {
-    new (): WeakSet<object>;
-    new <T extends object>(values?: ReadonlyArray<T> | null): WeakSet<T>;
-    readonly prototype: WeakSet<object>;
-}
-declare var WeakSet: WeakSetConstructor;
-
-
-interface Generator extends Iterator<any> { }
-
-interface GeneratorFunction {
-    /**
-     * Creates a new Generator object.
-     * @param args A list of arguments the function accepts.
-     */
-    new (...args: any[]): Generator;
-    /**
-     * Creates a new Generator object.
-     * @param args A list of arguments the function accepts.
-     */
-    (...args: any[]): Generator;
-    /**
-     * The length of the arguments.
-     */
-    readonly length: number;
-    /**
-     * Returns the name of the function.
-     */
-    readonly name: string;
-    /**
-     * A reference to the prototype.
-     */
-    readonly prototype: Generator;
-}
-
-interface GeneratorFunctionConstructor {
-    /**
-     * Creates a new Generator function.
-     * @param args A list of arguments the function accepts.
-     */
-    new (...args: string[]): GeneratorFunction;
-    /**
-     * Creates a new Generator function.
-     * @param args A list of arguments the function accepts.
-     */
-    (...args: string[]): GeneratorFunction;
-    /**
-     * The length of the arguments.
-     */
-    readonly length: number;
-    /**
-     * Returns the name of the function.
-     */
-    readonly name: string;
-    /**
-     * A reference to the prototype.
-     */
-    readonly prototype: GeneratorFunction;
-}
-
-
-/// <reference path="lib.es2015.symbol.d.ts" />
-
-interface SymbolConstructor {
-    /**
-     * A method that returns the default iterator for an object. Called by the semantics of the
-     * for-of statement.
-     */
-    readonly iterator: symbol;
-}
-
-interface IteratorResult<T> {
-    done: boolean;
-    value: T;
-}
-
-interface Iterator<T> {
-    next(value?: any): IteratorResult<T>;
-    return?(value?: any): IteratorResult<T>;
-    throw?(e?: any): IteratorResult<T>;
-}
-
-interface Iterable<T> {
-    [Symbol.iterator](): Iterator<T>;
-}
-
-interface IterableIterator<T> extends Iterator<T> {
-    [Symbol.iterator](): IterableIterator<T>;
-}
-
-interface Array<T> {
-    /** Iterator */
-    [Symbol.iterator](): IterableIterator<T>;
-
-    /**
-     * Returns an iterable of key, value pairs for every entry in the array
-     */
-    entries(): IterableIterator<[number, T]>;
-
-    /**
-     * Returns an iterable of keys in the array
-     */
-    keys(): IterableIterator<number>;
-
-    /**
-     * Returns an iterable of values in the array
-     */
-    values(): IterableIterator<T>;
-}
-
-interface ArrayConstructor {
-    /**
-     * Creates an array from an iterable object.
-     * @param iterable An iterable object to convert to an array.
-     */
-    from<T>(iterable: Iterable<T> | ArrayLike<T>): T[];
-
-    /**
-     * Creates an array from an iterable object.
-     * @param iterable An iterable object to convert to an array.
-     * @param mapfn A mapping function to call on every element of the array.
-     * @param thisArg Value of 'this' used to invoke the mapfn.
-     */
-    from<T, U>(iterable: Iterable<T> | ArrayLike<T>, mapfn: (v: T, k: number) => U, thisArg?: any): U[];
-}
-
-interface ReadonlyArray<T> {
-    /** Iterator of values in the array. */
-    [Symbol.iterator](): IterableIterator<T>;
-
-    /**
-     * Returns an iterable of key, value pairs for every entry in the array
-     */
-    entries(): IterableIterator<[number, T]>;
-
-    /**
-     * Returns an iterable of keys in the array
-     */
-    keys(): IterableIterator<number>;
-
-    /**
-     * Returns an iterable of values in the array
-     */
-    values(): IterableIterator<T>;
-}
-
-interface IArguments {
-    /** Iterator */
-    [Symbol.iterator](): IterableIterator<any>;
-}
-
-interface Map<K, V> {
-    /** Returns an iterable of entries in the map. */
-    [Symbol.iterator](): IterableIterator<[K, V]>;
-
-    /**
-     * Returns an iterable of key, value pairs for every entry in the map.
-     */
-    entries(): IterableIterator<[K, V]>;
-
-    /**
-     * Returns an iterable of keys in the map
-     */
-    keys(): IterableIterator<K>;
-
-    /**
-     * Returns an iterable of values in the map
-     */
-    values(): IterableIterator<V>;
-}
-
-interface ReadonlyMap<K, V> {
-    /** Returns an iterable of entries in the map. */
-    [Symbol.iterator](): IterableIterator<[K, V]>;
-
-    /**
-     * Returns an iterable of key, value pairs for every entry in the map.
-     */
-    entries(): IterableIterator<[K, V]>;
-
-    /**
-     * Returns an iterable of keys in the map
-     */
-    keys(): IterableIterator<K>;
-
-    /**
-     * Returns an iterable of values in the map
-     */
-    values(): IterableIterator<V>;
-}
-
-interface MapConstructor {
-    new <K, V>(iterable: Iterable<[K, V]>): Map<K, V>;
-}
-
-interface WeakMap<K extends object, V> { }
-
-interface WeakMapConstructor {
-    new <K extends object, V>(iterable: Iterable<[K, V]>): WeakMap<K, V>;
-}
-
-interface Set<T> {
-    /** Iterates over values in the set. */
-    [Symbol.iterator](): IterableIterator<T>;
-    /**
-     * Returns an iterable of [v,v] pairs for every value `v` in the set.
-     */
-    entries(): IterableIterator<[T, T]>;
-    /**
-     * Despite its name, returns an iterable of the values in the set,
-     */
-    keys(): IterableIterator<T>;
-
-    /**
-     * Returns an iterable of values in the set.
-     */
-    values(): IterableIterator<T>;
-}
-
-interface ReadonlySet<T> {
-    /** Iterates over values in the set. */
-    [Symbol.iterator](): IterableIterator<T>;
-
-    /**
-     * Returns an iterable of [v,v] pairs for every value `v` in the set.
-     */
-    entries(): IterableIterator<[T, T]>;
-
-    /**
-     * Despite its name, returns an iterable of the values in the set,
-     */
-    keys(): IterableIterator<T>;
-
-    /**
-     * Returns an iterable of values in the set.
-     */
-    values(): IterableIterator<T>;
-}
-
-interface SetConstructor {
-    new <T>(iterable: Iterable<T>): Set<T>;
-}
-
-interface WeakSet<T extends object> { }
-
-interface WeakSetConstructor {
-    new <T extends object>(iterable: Iterable<T>): WeakSet<T>;
-}
-
-interface Promise<T> { }
-
-interface PromiseConstructor {
-    /**
-     * Creates a Promise that is resolved with an array of results when all of the provided Promises
-     * resolve, or rejected when any Promise is rejected.
-     * @param values An array of Promises.
-     * @returns A new Promise.
-     */
-    all<TAll>(values: Iterable<TAll | PromiseLike<TAll>>): Promise<TAll[]>;
-
-    /**
-     * Creates a Promise that is resolved or rejected when any of the provided Promises are resolved
-     * or rejected.
-     * @param values An array of Promises.
-     * @returns A new Promise.
-     */
-    race<T>(values: Iterable<T | PromiseLike<T>>): Promise<T>;
-}
-
-declare namespace Reflect {
-    function enumerate(target: object): IterableIterator<any>;
-}
-
-interface String {
-    /** Iterator */
-    [Symbol.iterator](): IterableIterator<string>;
-}
-
-interface Int8Array {
-    [Symbol.iterator](): IterableIterator<number>;
-    /**
-     * Returns an array of key, value pairs for every entry in the array
-     */
-    entries(): IterableIterator<[number, number]>;
-    /**
-     * Returns an list of keys in the array
-     */
-    keys(): IterableIterator<number>;
-    /**
-     * Returns an list of values in the array
-     */
-    values(): IterableIterator<number>;
-}
-
-interface Int8ArrayConstructor {
-    new (elements: Iterable<number>): Int8Array;
-
-    /**
-     * Creates an array from an array-like or iterable object.
-     * @param arrayLike An array-like or iterable object to convert to an array.
-     * @param mapfn A mapping function to call on every element of the array.
-     * @param thisArg Value of 'this' used to invoke the mapfn.
-     */
-    from(arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int8Array;
-}
-
-interface Uint8Array {
-    [Symbol.iterator](): IterableIterator<number>;
-    /**
-     * Returns an array of key, value pairs for every entry in the array
-     */
-    entries(): IterableIterator<[number, number]>;
-    /**
-     * Returns an list of keys in the array
-     */
-    keys(): IterableIterator<number>;
-    /**
-     * Returns an list of values in the array
-     */
-    values(): IterableIterator<number>;
-}
-
-interface Uint8ArrayConstructor {
-    new (elements: Iterable<number>): Uint8Array;
-
-    /**
-     * Creates an array from an array-like or iterable object.
-     * @param arrayLike An array-like or iterable object to convert to an array.
-     * @param mapfn A mapping function to call on every element of the array.
-     * @param thisArg Value of 'this' used to invoke the mapfn.
-     */
-    from(arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint8Array;
-}
-
-interface Uint8ClampedArray {
-    [Symbol.iterator](): IterableIterator<number>;
-    /**
-     * Returns an array of key, value pairs for every entry in the array
-     */
-    entries(): IterableIterator<[number, number]>;
-
-    /**
-     * Returns an list of keys in the array
-     */
-    keys(): IterableIterator<number>;
-
-    /**
-     * Returns an list of values in the array
-     */
-    values(): IterableIterator<number>;
-}
-
-interface Uint8ClampedArrayConstructor {
-    new (elements: Iterable<number>): Uint8ClampedArray;
-
-
-    /**
-     * Creates an array from an array-like or iterable object.
-     * @param arrayLike An array-like or iterable object to convert to an array.
-     * @param mapfn A mapping function to call on every element of the array.
-     * @param thisArg Value of 'this' used to invoke the mapfn.
-     */
-    from(arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint8ClampedArray;
-}
-
-interface Int16Array {
-    [Symbol.iterator](): IterableIterator<number>;
-    /**
-     * Returns an array of key, value pairs for every entry in the array
-     */
-    entries(): IterableIterator<[number, number]>;
-
-    /**
-     * Returns an list of keys in the array
-     */
-    keys(): IterableIterator<number>;
-
-    /**
-     * Returns an list of values in the array
-     */
-    values(): IterableIterator<number>;
-}
-
-interface Int16ArrayConstructor {
-    new (elements: Iterable<number>): Int16Array;
-
-    /**
-     * Creates an array from an array-like or iterable object.
-     * @param arrayLike An array-like or iterable object to convert to an array.
-     * @param mapfn A mapping function to call on every element of the array.
-     * @param thisArg Value of 'this' used to invoke the mapfn.
-     */
-    from(arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int16Array;
-}
-
-interface Uint16Array {
-    [Symbol.iterator](): IterableIterator<number>;
-    /**
-     * Returns an array of key, value pairs for every entry in the array
-     */
-    entries(): IterableIterator<[number, number]>;
-    /**
-     * Returns an list of keys in the array
-     */
-    keys(): IterableIterator<number>;
-    /**
-     * Returns an list of values in the array
-     */
-    values(): IterableIterator<number>;
-}
-
-interface Uint16ArrayConstructor {
-    new (elements: Iterable<number>): Uint16Array;
-
-    /**
-     * Creates an array from an array-like or iterable object.
-     * @param arrayLike An array-like or iterable object to convert to an array.
-     * @param mapfn A mapping function to call on every element of the array.
-     * @param thisArg Value of 'this' used to invoke the mapfn.
-     */
-    from(arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint16Array;
-}
-
-interface Int32Array {
-    [Symbol.iterator](): IterableIterator<number>;
-    /**
-     * Returns an array of key, value pairs for every entry in the array
-     */
-    entries(): IterableIterator<[number, number]>;
-    /**
-     * Returns an list of keys in the array
-     */
-    keys(): IterableIterator<number>;
-    /**
-     * Returns an list of values in the array
-     */
-    values(): IterableIterator<number>;
-}
-
-interface Int32ArrayConstructor {
-    new (elements: Iterable<number>): Int32Array;
-
-    /**
-     * Creates an array from an array-like or iterable object.
-     * @param arrayLike An array-like or iterable object to convert to an array.
-     * @param mapfn A mapping function to call on every element of the array.
-     * @param thisArg Value of 'this' used to invoke the mapfn.
-     */
-    from(arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int32Array;
-}
-
-interface Uint32Array {
-    [Symbol.iterator](): IterableIterator<number>;
-    /**
-     * Returns an array of key, value pairs for every entry in the array
-     */
-    entries(): IterableIterator<[number, number]>;
-    /**
-     * Returns an list of keys in the array
-     */
-    keys(): IterableIterator<number>;
-    /**
-     * Returns an list of values in the array
-     */
-    values(): IterableIterator<number>;
-}
-
-interface Uint32ArrayConstructor {
-    new (elements: Iterable<number>): Uint32Array;
-
-    /**
-     * Creates an array from an array-like or iterable object.
-     * @param arrayLike An array-like or iterable object to convert to an array.
-     * @param mapfn A mapping function to call on every element of the array.
-     * @param thisArg Value of 'this' used to invoke the mapfn.
-     */
-    from(arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint32Array;
-}
-
-interface Float32Array {
-    [Symbol.iterator](): IterableIterator<number>;
-    /**
-     * Returns an array of key, value pairs for every entry in the array
-     */
-    entries(): IterableIterator<[number, number]>;
-    /**
-     * Returns an list of keys in the array
-     */
-    keys(): IterableIterator<number>;
-    /**
-     * Returns an list of values in the array
-     */
-    values(): IterableIterator<number>;
-}
-
-interface Float32ArrayConstructor {
-    new (elements: Iterable<number>): Float32Array;
-
-    /**
-     * Creates an array from an array-like or iterable object.
-     * @param arrayLike An array-like or iterable object to convert to an array.
-     * @param mapfn A mapping function to call on every element of the array.
-     * @param thisArg Value of 'this' used to invoke the mapfn.
-     */
-    from(arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Float32Array;
-}
-
-interface Float64Array {
-    [Symbol.iterator](): IterableIterator<number>;
-    /**
-     * Returns an array of key, value pairs for every entry in the array
-     */
-    entries(): IterableIterator<[number, number]>;
-    /**
-     * Returns an list of keys in the array
-     */
-    keys(): IterableIterator<number>;
-    /**
-     * Returns an list of values in the array
-     */
-    values(): IterableIterator<number>;
-}
-
-interface Float64ArrayConstructor {
-    new (elements: Iterable<number>): Float64Array;
-
-    /**
-     * Creates an array from an array-like or iterable object.
-     * @param arrayLike An array-like or iterable object to convert to an array.
-     * @param mapfn A mapping function to call on every element of the array.
-     * @param thisArg Value of 'this' used to invoke the mapfn.
-     */
-    from(arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Float64Array;
-}
-
-
-interface PromiseConstructor {
-    /**
-     * A reference to the prototype.
-     */
-    readonly prototype: Promise<any>;
-
-    /**
-     * Creates a new Promise.
-     * @param executor A callback used to initialize the promise. This callback is passed two arguments:
-     * a resolve callback used resolve the promise with a value or the result of another promise,
-     * and a reject callback used to reject the promise with a provided reason or error.
-     */
-    new <T>(executor: (resolve: (value?: T | PromiseLike<T>) => void, reject: (reason?: any) => void) => void): Promise<T>;
-
-    /**
-     * Creates a Promise that is resolved with an array of results when all of the provided Promises
-     * resolve, or rejected when any Promise is rejected.
-     * @param values An array of Promises.
-     * @returns A new Promise.
-     */
-    all<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10>(values: [T1 | PromiseLike<T1>, T2 | PromiseLike<T2>, T3 | PromiseLike<T3>, T4 | PromiseLike <T4>, T5 | PromiseLike<T5>, T6 | PromiseLike<T6>, T7 | PromiseLike<T7>, T8 | PromiseLike<T8>, T9 | PromiseLike<T9>, T10 | PromiseLike<T10>]): Promise<[T1, T2, T3, T4, T5, T6, T7, T8, T9, T10]>;
-
-    /**
-     * Creates a Promise that is resolved with an array of results when all of the provided Promises
-     * resolve, or rejected when any Promise is rejected.
-     * @param values An array of Promises.
-     * @returns A new Promise.
-     */
-    all<T1, T2, T3, T4, T5, T6, T7, T8, T9>(values: [T1 | PromiseLike<T1>, T2 | PromiseLike<T2>, T3 | PromiseLike<T3>, T4 | PromiseLike <T4>, T5 | PromiseLike<T5>, T6 | PromiseLike<T6>, T7 | PromiseLike<T7>, T8 | PromiseLike<T8>, T9 | PromiseLike<T9>]): Promise<[T1, T2, T3, T4, T5, T6, T7, T8, T9]>;
-
-    /**
-     * Creates a Promise that is resolved with an array of results when all of the provided Promises
-     * resolve, or rejected when any Promise is rejected.
-     * @param values An array of Promises.
-     * @returns A new Promise.
-     */
-    all<T1, T2, T3, T4, T5, T6, T7, T8>(values: [T1 | PromiseLike<T1>, T2 | PromiseLike<T2>, T3 | PromiseLike<T3>, T4 | PromiseLike <T4>, T5 | PromiseLike<T5>, T6 | PromiseLike<T6>, T7 | PromiseLike<T7>, T8 | PromiseLike<T8>]): Promise<[T1, T2, T3, T4, T5, T6, T7, T8]>;
-
-    /**
-     * Creates a Promise that is resolved with an array of results when all of the provided Promises
-     * resolve, or rejected when any Promise is rejected.
-     * @param values An array of Promises.
-     * @returns A new Promise.
-     */
-    all<T1, T2, T3, T4, T5, T6, T7>(values: [T1 | PromiseLike<T1>, T2 | PromiseLike<T2>, T3 | PromiseLike<T3>, T4 | PromiseLike <T4>, T5 | PromiseLike<T5>, T6 | PromiseLike<T6>, T7 | PromiseLike<T7>]): Promise<[T1, T2, T3, T4, T5, T6, T7]>;
-
-    /**
-     * Creates a Promise that is resolved with an array of results when all of the provided Promises
-     * resolve, or rejected when any Promise is rejected.
-     * @param values An array of Promises.
-     * @returns A new Promise.
-     */
-    all<T1, T2, T3, T4, T5, T6>(values: [T1 | PromiseLike<T1>, T2 | PromiseLike<T2>, T3 | PromiseLike<T3>, T4 | PromiseLike <T4>, T5 | PromiseLike<T5>, T6 | PromiseLike<T6>]): Promise<[T1, T2, T3, T4, T5, T6]>;
-
-    /**
-     * Creates a Promise that is resolved with an array of results when all of the provided Promises
-     * resolve, or rejected when any Promise is rejected.
-     * @param values An array of Promises.
-     * @returns A new Promise.
-     */
-    all<T1, T2, T3, T4, T5>(values: [T1 | PromiseLike<T1>, T2 | PromiseLike<T2>, T3 | PromiseLike<T3>, T4 | PromiseLike <T4>, T5 | PromiseLike<T5>]): Promise<[T1, T2, T3, T4, T5]>;
-
-    /**
-     * Creates a Promise that is resolved with an array of results when all of the provided Promises
-     * resolve, or rejected when any Promise is rejected.
-     * @param values An array of Promises.
-     * @returns A new Promise.
-     */
-    all<T1, T2, T3, T4>(values: [T1 | PromiseLike<T1>, T2 | PromiseLike<T2>, T3 | PromiseLike<T3>, T4 | PromiseLike <T4>]): Promise<[T1, T2, T3, T4]>;
-
-    /**
-     * Creates a Promise that is resolved with an array of results when all of the provided Promises
-     * resolve, or rejected when any Promise is rejected.
-     * @param values An array of Promises.
-     * @returns A new Promise.
-     */
-    all<T1, T2, T3>(values: [T1 | PromiseLike<T1>, T2 | PromiseLike<T2>, T3 | PromiseLike<T3>]): Promise<[T1, T2, T3]>;
-
-    /**
-     * Creates a Promise that is resolved with an array of results when all of the provided Promises
-     * resolve, or rejected when any Promise is rejected.
-     * @param values An array of Promises.
-     * @returns A new Promise.
-     */
-    all<T1, T2>(values: [T1 | PromiseLike<T1>, T2 | PromiseLike<T2>]): Promise<[T1, T2]>;
-
-    /**
-     * Creates a Promise that is resolved with an array of results when all of the provided Promises
-     * resolve, or rejected when any Promise is rejected.
-     * @param values An array of Promises.
-     * @returns A new Promise.
-     */
-    all<T>(values: (T | PromiseLike<T>)[]): Promise<T[]>;
-
-    /**
-     * Creates a Promise that is resolved or rejected when any of the provided Promises are resolved
-     * or rejected.
-     * @param values An array of Promises.
-     * @returns A new Promise.
-     */
-    race<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10>(values: [T1 | PromiseLike<T1>, T2 | PromiseLike<T2>, T3 | PromiseLike<T3>, T4 | PromiseLike<T4>, T5 | PromiseLike<T5>, T6 | PromiseLike<T6>, T7 | PromiseLike<T7>, T8 | PromiseLike<T8>, T9 | PromiseLike<T9>, T10 | PromiseLike<T10>]): Promise<T1 | T2 | T3 | T4 | T5 | T6 | T7 | T8 | T9 | T10>;
-
-    /**
-     * Creates a Promise that is resolved or rejected when any of the provided Promises are resolved
-     * or rejected.
-     * @param values An array of Promises.
-     * @returns A new Promise.
-     */
-    race<T1, T2, T3, T4, T5, T6, T7, T8, T9>(values: [T1 | PromiseLike<T1>, T2 | PromiseLike<T2>, T3 | PromiseLike<T3>, T4 | PromiseLike<T4>, T5 | PromiseLike<T5>, T6 | PromiseLike<T6>, T7 | PromiseLike<T7>, T8 | PromiseLike<T8>, T9 | PromiseLike<T9>]): Promise<T1 | T2 | T3 | T4 | T5 | T6 | T7 | T8 | T9>;
-
-    /**
-     * Creates a Promise that is resolved or rejected when any of the provided Promises are resolved
-     * or rejected.
-     * @param values An array of Promises.
-     * @returns A new Promise.
-     */
-    race<T1, T2, T3, T4, T5, T6, T7, T8>(values: [T1 | PromiseLike<T1>, T2 | PromiseLike<T2>, T3 | PromiseLike<T3>, T4 | PromiseLike<T4>, T5 | PromiseLike<T5>, T6 | PromiseLike<T6>, T7 | PromiseLike<T7>, T8 | PromiseLike<T8>]): Promise<T1 | T2 | T3 | T4 | T5 | T6 | T7 | T8>;
-
-    /**
-     * Creates a Promise that is resolved or rejected when any of the provided Promises are resolved
-     * or rejected.
-     * @param values An array of Promises.
-     * @returns A new Promise.
-     */
-    race<T1, T2, T3, T4, T5, T6, T7>(values: [T1 | PromiseLike<T1>, T2 | PromiseLike<T2>, T3 | PromiseLike<T3>, T4 | PromiseLike<T4>, T5 | PromiseLike<T5>, T6 | PromiseLike<T6>, T7 | PromiseLike<T7>]): Promise<T1 | T2 | T3 | T4 | T5 | T6 | T7>;
-
-    /**
-     * Creates a Promise that is resolved or rejected when any of the provided Promises are resolved
-     * or rejected.
-     * @param values An array of Promises.
-     * @returns A new Promise.
-     */
-    race<T1, T2, T3, T4, T5, T6>(values: [T1 | PromiseLike<T1>, T2 | PromiseLike<T2>, T3 | PromiseLike<T3>, T4 | PromiseLike<T4>, T5 | PromiseLike<T5>, T6 | PromiseLike<T6>]): Promise<T1 | T2 | T3 | T4 | T5 | T6>;
-
-    /**
-     * Creates a Promise that is resolved or rejected when any of the provided Promises are resolved
-     * or rejected.
-     * @param values An array of Promises.
-     * @returns A new Promise.
-     */
-    race<T1, T2, T3, T4, T5>(values: [T1 | PromiseLike<T1>, T2 | PromiseLike<T2>, T3 | PromiseLike<T3>, T4 | PromiseLike<T4>, T5 | PromiseLike<T5>]): Promise<T1 | T2 | T3 | T4 | T5>;
-
-    /**
-     * Creates a Promise that is resolved or rejected when any of the provided Promises are resolved
-     * or rejected.
-     * @param values An array of Promises.
-     * @returns A new Promise.
-     */
-    race<T1, T2, T3, T4>(values: [T1 | PromiseLike<T1>, T2 | PromiseLike<T2>, T3 | PromiseLike<T3>, T4 | PromiseLike<T4>]): Promise<T1 | T2 | T3 | T4>;
-
-    /**
-     * Creates a Promise that is resolved or rejected when any of the provided Promises are resolved
-     * or rejected.
-     * @param values An array of Promises.
-     * @returns A new Promise.
-     */
-    race<T1, T2, T3>(values: [T1 | PromiseLike<T1>, T2 | PromiseLike<T2>, T3 | PromiseLike<T3>]): Promise<T1 | T2 | T3>;
-
-    /**
-     * Creates a Promise that is resolved or rejected when any of the provided Promises are resolved
-     * or rejected.
-     * @param values An array of Promises.
-     * @returns A new Promise.
-     */
-    race<T1, T2>(values: [T1 | PromiseLike<T1>, T2 | PromiseLike<T2>]): Promise<T1 | T2>;
-
-    /**
-     * Creates a Promise that is resolved or rejected when any of the provided Promises are resolved
-     * or rejected.
-     * @param values An array of Promises.
-     * @returns A new Promise.
-     */
-    race<T>(values: (T | PromiseLike<T>)[]): Promise<T>;
-
-    /**
-     * Creates a new rejected promise for the provided reason.
-     * @param reason The reason the promise was rejected.
-     * @returns A new rejected Promise.
-     */
-    reject<T = never>(reason?: any): Promise<T>;
-
-    /**
-     * Creates a new resolved promise for the provided value.
-     * @param value A promise.
-     * @returns A promise whose internal state matches the provided promise.
-     */
-    resolve<T>(value: T | PromiseLike<T>): Promise<T>;
-
-    /**
-     * Creates a new resolved promise .
-     * @returns A resolved promise.
-     */
-    resolve(): Promise<void>;
-}
-
-declare var Promise: PromiseConstructor;
-
-interface ProxyHandler<T extends object> {
-    getPrototypeOf? (target: T): object | null;
-    setPrototypeOf? (target: T, v: any): boolean;
-    isExtensible? (target: T): boolean;
-    preventExtensions? (target: T): boolean;
-    getOwnPropertyDescriptor? (target: T, p: PropertyKey): PropertyDescriptor | undefined;
-    has? (target: T, p: PropertyKey): boolean;
-    get? (target: T, p: PropertyKey, receiver: any): any;
-    set? (target: T, p: PropertyKey, value: any, receiver: any): boolean;
-    deleteProperty? (target: T, p: PropertyKey): boolean;
-    defineProperty? (target: T, p: PropertyKey, attributes: PropertyDescriptor): boolean;
-    enumerate? (target: T): PropertyKey[];
-    ownKeys? (target: T): PropertyKey[];
-    apply? (target: T, thisArg: any, argArray?: any): any;
-    construct? (target: T, argArray: any, newTarget?: any): object;
-}
-
-interface ProxyConstructor {
-    revocable<T extends object>(target: T, handler: ProxyHandler<T>): { proxy: T; revoke: () => void; };
-    new <T extends object>(target: T, handler: ProxyHandler<T>): T;
-}
-declare var Proxy: ProxyConstructor;
-
-
-declare namespace Reflect {
-    function apply(target: Function, thisArgument: any, argumentsList: ArrayLike<any>): any;
-    function construct(target: Function, argumentsList: ArrayLike<any>, newTarget?: any): any;
-    function defineProperty(target: object, propertyKey: PropertyKey, attributes: PropertyDescriptor): boolean;
-    function deleteProperty(target: object, propertyKey: PropertyKey): boolean;
-    function get(target: object, propertyKey: PropertyKey, receiver?: any): any;
-    function getOwnPropertyDescriptor(target: object, propertyKey: PropertyKey): PropertyDescriptor | undefined;
-    function getPrototypeOf(target: object): object;
-    function has(target: object, propertyKey: PropertyKey): boolean;
-    function isExtensible(target: object): boolean;
-    function ownKeys(target: object): PropertyKey[];
-    function preventExtensions(target: object): boolean;
-    function set(target: object, propertyKey: PropertyKey, value: any, receiver?: any): boolean;
-    function setPrototypeOf(target: object, proto: any): boolean;
-}
-
-
-interface SymbolConstructor {
-    /**
-     * A reference to the prototype.
-     */
-    readonly prototype: Symbol;
-
-    /**
-     * Returns a new unique Symbol value.
-     * @param  description Description of the new Symbol object.
-     */
-    (description?: string | number): symbol;
-
-    /**
-     * Returns a Symbol object from the global symbol registry matching the given key if found.
-     * Otherwise, returns a new symbol with this key.
-     * @param key key to search for.
-     */
-    for(key: string): symbol;
-
-    /**
-     * Returns a key from the global symbol registry matching the given Symbol if found.
-     * Otherwise, returns a undefined.
-     * @param sym Symbol to find the key for.
-     */
-    keyFor(sym: symbol): string | undefined;
-}
-
-declare var Symbol: SymbolConstructor;
-
-/// <reference path="lib.es2015.symbol.d.ts" />
-
-interface SymbolConstructor {
-    /**
-     * A method that determines if a constructor object recognizes an object as one of the
-     * constructor’s instances. Called by the semantics of the instanceof operator.
-     */
-    readonly hasInstance: symbol;
-
-    /**
-     * A Boolean value that if true indicates that an object should flatten to its array elements
-     * by Array.prototype.concat.
-     */
-    readonly isConcatSpreadable: symbol;
-
-    /**
-     * A regular expression method that matches the regular expression against a string. Called
-     * by the String.prototype.match method.
-     */
-    readonly match: symbol;
-
-    /**
-     * A regular expression method that replaces matched substrings of a string. Called by the
-     * String.prototype.replace method.
-     */
-    readonly replace: symbol;
-
-    /**
-     * A regular expression method that returns the index within a string that matches the
-     * regular expression. Called by the String.prototype.search method.
-     */
-    readonly search: symbol;
-
-    /**
-     * A function valued property that is the constructor function that is used to create
-     * derived objects.
-     */
-    readonly species: symbol;
-
-    /**
-     * A regular expression method that splits a string at the indices that match the regular
-     * expression. Called by the String.prototype.split method.
-     */
-    readonly split: symbol;
-
-    /**
-     * A method that converts an object to a corresponding primitive value.
-     * Called by the ToPrimitive abstract operation.
-     */
-    readonly toPrimitive: symbol;
-
-    /**
-     * A String value that is used in the creation of the default string description of an object.
-     * Called by the built-in method Object.prototype.toString.
-     */
-    readonly toStringTag: symbol;
-
-    /**
-     * An Object whose own property names are property names that are excluded from the 'with'
-     * environment bindings of the associated objects.
-     */
-    readonly unscopables: symbol;
-}
-
-interface Symbol {
-    readonly [Symbol.toStringTag]: "Symbol";
-}
-
-interface Array<T> {
-    /**
-     * Returns an object whose properties have the value 'true'
-     * when they will be absent when used in a 'with' statement.
-     */
-    [Symbol.unscopables](): {
-        copyWithin: boolean;
-        entries: boolean;
-        fill: boolean;
-        find: boolean;
-        findIndex: boolean;
-        keys: boolean;
-        values: boolean;
-    };
-}
-
-interface Date {
-    /**
-     * Converts a Date object to a string.
-     */
-    [Symbol.toPrimitive](hint: "default"): string;
-    /**
-     * Converts a Date object to a string.
-     */
-    [Symbol.toPrimitive](hint: "string"): string;
-    /**
-     * Converts a Date object to a number.
-     */
-    [Symbol.toPrimitive](hint: "number"): number;
-    /**
-     * Converts a Date object to a string or number.
-     *
-     * @param hint The strings "number", "string", or "default" to specify what primitive to return.
-     *
-     * @throws {TypeError} If 'hint' was given something other than "number", "string", or "default".
-     * @returns A number if 'hint' was "number", a string if 'hint' was "string" or "default".
-     */
-    [Symbol.toPrimitive](hint: string): string | number;
-}
-
-interface Map<K, V> {
-    readonly [Symbol.toStringTag]: "Map";
-}
-
-interface WeakMap<K extends object, V> {
-    readonly [Symbol.toStringTag]: "WeakMap";
-}
-
-interface Set<T> {
-    readonly [Symbol.toStringTag]: "Set";
-}
-
-interface WeakSet<T extends object> {
-    readonly [Symbol.toStringTag]: "WeakSet";
-}
-
-interface JSON {
-    readonly [Symbol.toStringTag]: "JSON";
-}
-
-interface Function {
-    /**
-     * Determines whether the given value inherits from this function if this function was used
-     * as a constructor function.
-     *
-     * A constructor function can control which objects are recognized as its instances by
-     * 'instanceof' by overriding this method.
-     */
-    [Symbol.hasInstance](value: any): boolean;
-}
-
-interface GeneratorFunction {
-    readonly [Symbol.toStringTag]: "GeneratorFunction";
-}
-
-interface Math {
-    readonly [Symbol.toStringTag]: "Math";
-}
-
-interface Promise<T> {
-    readonly [Symbol.toStringTag]: "Promise";
-}
-
-interface PromiseConstructor {
-    readonly [Symbol.species]: PromiseConstructor;
-}
-
-interface RegExp {
-    /**
-     * Matches a string with this regular expression, and returns an array containing the results of
-     * that search.
-     * @param string A string to search within.
-     */
-    [Symbol.match](string: string): RegExpMatchArray | null;
-
-    /**
-     * Replaces text in a string, using this regular expression.
-     * @param string A String object or string literal whose contents matching against
-     *               this regular expression will be replaced
-     * @param replaceValue A String object or string literal containing the text to replace for every
-     *                     successful match of this regular expression.
-     */
-    [Symbol.replace](string: string, replaceValue: string): string;
-
-    /**
-     * Replaces text in a string, using this regular expression.
-     * @param string A String object or string literal whose contents matching against
-     *               this regular expression will be replaced
-     * @param replacer A function that returns the replacement text.
-     */
-    [Symbol.replace](string: string, replacer: (substring: string, ...args: any[]) => string): string;
-
-    /**
-     * Finds the position beginning first substring match in a regular expression search
-     * using this regular expression.
-     *
-     * @param string The string to search within.
-     */
-    [Symbol.search](string: string): number;
-
-    /**
-     * Returns an array of substrings that were delimited by strings in the original input that
-     * match against this regular expression.
-     *
-     * If the regular expression contains capturing parentheses, then each time this
-     * regular expression matches, the results (including any undefined results) of the
-     * capturing parentheses are spliced.
-     *
-     * @param string string value to split
-     * @param limit if not undefined, the output array is truncated so that it contains no more
-     * than 'limit' elements.
-     */
-    [Symbol.split](string: string, limit?: number): string[];
-}
-
-interface RegExpConstructor {
-    readonly [Symbol.species]: RegExpConstructor;
-}
-
-interface String {
-    /**
-     * Matches a string an object that supports being matched against, and returns an array containing the results of that search.
-     * @param matcher An object that supports being matched against.
-     */
-    match(matcher: { [Symbol.match](string: string): RegExpMatchArray | null; }): RegExpMatchArray | null;
-
-    /**
-     * Replaces text in a string, using an object that supports replacement within a string.
-     * @param searchValue A object can search for and replace matches within a string.
-     * @param replaceValue A string containing the text to replace for every successful match of searchValue in this string.
-     */
-    replace(searchValue: { [Symbol.replace](string: string, replaceValue: string): string; }, replaceValue: string): string;
-
-    /**
-     * Replaces text in a string, using an object that supports replacement within a string.
-     * @param searchValue A object can search for and replace matches within a string.
-     * @param replacer A function that returns the replacement text.
-     */
-    replace(searchValue: { [Symbol.replace](string: string, replacer: (substring: string, ...args: any[]) => string): string; }, replacer: (substring: string, ...args: any[]) => string): string;
-
-    /**
-     * Finds the first substring match in a regular expression search.
-     * @param searcher An object which supports searching within a string.
-     */
-    search(searcher: { [Symbol.search](string: string): number; }): number;
-
-    /**
-     * Split a string into substrings using the specified separator and return them as an array.
-     * @param splitter An object that can split a string.
-     * @param limit A value used to limit the number of elements returned in the array.
-     */
-    split(splitter: { [Symbol.split](string: string, limit?: number): string[]; }, limit?: number): string[];
-}
-
-interface ArrayBuffer {
-    readonly [Symbol.toStringTag]: "ArrayBuffer";
-}
-
-interface DataView {
-    readonly [Symbol.toStringTag]: "DataView";
-}
-
-interface Int8Array {
-    readonly [Symbol.toStringTag]: "Int8Array";
-}
-
-interface Uint8Array {
-    readonly [Symbol.toStringTag]: "UInt8Array";
-}
-
-interface Uint8ClampedArray {
-    readonly [Symbol.toStringTag]: "Uint8ClampedArray";
-}
-
-interface Int16Array {
-    readonly [Symbol.toStringTag]: "Int16Array";
-}
-
-interface Uint16Array {
-    readonly [Symbol.toStringTag]: "Uint16Array";
-}
-
-interface Int32Array {
-    readonly [Symbol.toStringTag]: "Int32Array";
-}
-
-interface Uint32Array {
-    readonly [Symbol.toStringTag]: "Uint32Array";
-}
-
-interface Float32Array {
-    readonly [Symbol.toStringTag]: "Float32Array";
-}
-
-interface Float64Array {
-    readonly [Symbol.toStringTag]: "Float64Array";
-}
-
-interface ArrayConstructor {
-    readonly [Symbol.species]: ArrayConstructor;
-}
-interface MapConstructor {
-    readonly [Symbol.species]: MapConstructor;
-}
-interface SetConstructor {
-    readonly [Symbol.species]: SetConstructor;
-}
-interface ArrayBufferConstructor {
-    readonly [Symbol.species]: ArrayBufferConstructor;
-}
-
-/////////////////////////////
-/// DOM APIs
-/////////////////////////////
-
-interface Account {
-    displayName: string;
-    id: string;
-    imageURL?: string;
-    name?: string;
-    rpDisplayName: string;
-}
-
-interface AddEventListenerOptions extends EventListenerOptions {
-    once?: boolean;
-    passive?: boolean;
-}
-
-interface AesCbcParams extends Algorithm {
-    iv: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-}
-
-interface AesCtrParams extends Algorithm {
-    counter: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-    length: number;
-}
-
-interface AesDerivedKeyParams extends Algorithm {
-    length: number;
-}
-
-interface AesGcmParams extends Algorithm {
-    additionalData?: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-    iv: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-    tagLength?: number;
-}
-
-interface AesKeyAlgorithm extends KeyAlgorithm {
-    length: number;
-}
-
-interface AesKeyGenParams extends Algorithm {
-    length: number;
-}
-
-interface Algorithm {
-    name: string;
-}
-
-interface AnalyserOptions extends AudioNodeOptions {
-    fftSize?: number;
-    maxDecibels?: number;
-    minDecibels?: number;
-    smoothingTimeConstant?: number;
-}
-
-interface AnimationEventInit extends EventInit {
-    animationName?: string;
-    elapsedTime?: number;
-}
-
-interface AssertionOptions {
-    allowList?: ScopedCredentialDescriptor[];
-    extensions?: WebAuthnExtensions;
-    rpId?: string;
-    timeoutSeconds?: number;
-}
-
-interface AudioBufferOptions {
-    length: number;
-    numberOfChannels?: number;
-    sampleRate: number;
-}
-
-interface AudioBufferSourceOptions {
-    buffer?: AudioBuffer | null;
-    detune?: number;
-    loop?: boolean;
-    loopEnd?: number;
-    loopStart?: number;
-    playbackRate?: number;
-}
-
-interface AudioContextInfo {
-    currentTime?: number;
-    sampleRate?: number;
-}
-
-interface AudioContextOptions {
-    latencyHint?: AudioContextLatencyCategory | number;
-    sampleRate?: number;
-}
-
-interface AudioNodeOptions {
-    channelCount?: number;
-    channelCountMode?: ChannelCountMode;
-    channelInterpretation?: ChannelInterpretation;
-}
-
-interface AudioParamDescriptor {
-    defaultValue?: number;
-    maxValue?: number;
-    minValue?: number;
-    name?: string;
-}
-
-interface AudioProcessingEventInit extends EventInit {
-    inputBuffer: AudioBuffer;
-    outputBuffer: AudioBuffer;
-    playbackTime: number;
-}
-
-interface AudioTimestamp {
-    contextTime?: number;
-    performanceTime?: number;
-}
-
-interface BiquadFilterOptions extends AudioNodeOptions {
-    Q?: number;
-    detune?: number;
-    frequency?: number;
-    gain?: number;
-    type?: BiquadFilterType;
-}
-
-interface ByteLengthChunk {
-    byteLength?: number;
-}
-
-interface CacheQueryOptions {
-    cacheName?: string;
-    ignoreMethod?: boolean;
-    ignoreSearch?: boolean;
-    ignoreVary?: boolean;
-}
-
-interface ChannelMergerOptions extends AudioNodeOptions {
-    numberOfInputs?: number;
-}
-
-interface ChannelSplitterOptions extends AudioNodeOptions {
-    numberOfOutputs?: number;
-}
-
-interface ClientData {
-    challenge: string;
-    extensions?: WebAuthnExtensions;
-    hashAlg: string | Algorithm;
-    origin: string;
-    rpId: string;
-    tokenBinding?: string;
-}
-
-interface ClientQueryOptions {
-    includeReserved?: boolean;
-    includeUncontrolled?: boolean;
-    type?: ClientTypes;
-}
-
-interface CloseEventInit extends EventInit {
-    code?: number;
-    reason?: string;
-    wasClean?: boolean;
-}
-
-interface CompositionEventInit extends UIEventInit {
-    data?: string;
-}
-
-interface ConfirmSiteSpecificExceptionsInformation extends ExceptionInformation {
-    arrayOfDomainStrings?: string[];
-}
-
-interface ConstantSourceOptions {
-    offset?: number;
-}
-
-interface ConstrainBooleanParameters {
-    exact?: boolean;
-    ideal?: boolean;
-}
-
-interface ConstrainDOMStringParameters {
-    exact?: string | string[];
-    ideal?: string | string[];
-}
-
-interface ConstrainDoubleRange extends DoubleRange {
-    exact?: number;
-    ideal?: number;
-}
-
-interface ConstrainLongRange extends LongRange {
-    exact?: number;
-    ideal?: number;
-}
-
-interface ConstrainVideoFacingModeParameters {
-    exact?: VideoFacingModeEnum | VideoFacingModeEnum[];
-    ideal?: VideoFacingModeEnum | VideoFacingModeEnum[];
-}
-
-interface ConvolverOptions extends AudioNodeOptions {
-    buffer?: AudioBuffer | null;
-    disableNormalization?: boolean;
-}
-
-interface CustomEventInit<T = any> extends EventInit {
-    detail?: T;
-}
-
-interface DOMRectInit {
-    height?: number;
-    width?: number;
-    x?: number;
-    y?: number;
-}
-
-interface DelayOptions extends AudioNodeOptions {
-    delayTime?: number;
-    maxDelayTime?: number;
-}
-
-interface DeviceAccelerationDict {
-    x?: number | null;
-    y?: number | null;
-    z?: number | null;
-}
-
-interface DeviceLightEventInit extends EventInit {
-    value?: number;
-}
-
-interface DeviceMotionEventInit extends EventInit {
-    acceleration?: DeviceAccelerationDict | null;
-    accelerationIncludingGravity?: DeviceAccelerationDict | null;
-    interval?: number | null;
-    rotationRate?: DeviceRotationRateDict | null;
-}
-
-interface DeviceOrientationEventInit extends EventInit {
-    absolute?: boolean;
-    alpha?: number | null;
-    beta?: number | null;
-    gamma?: number | null;
-}
-
-interface DeviceRotationRateDict {
-    alpha?: number | null;
-    beta?: number | null;
-    gamma?: number | null;
-}
-
-interface DoubleRange {
-    max?: number;
-    min?: number;
-}
-
-interface DynamicsCompressorOptions extends AudioNodeOptions {
-    attack?: number;
-    knee?: number;
-    ratio?: number;
-    release?: number;
-    threshold?: number;
-}
-
-interface EcKeyAlgorithm extends KeyAlgorithm {
-    namedCurve: string;
-}
-
-interface EcKeyGenParams extends Algorithm {
-    namedCurve: string;
-}
-
-interface EcKeyImportParams extends Algorithm {
-    namedCurve: string;
-}
-
-interface EcdhKeyDeriveParams extends Algorithm {
-    public: CryptoKey;
-}
-
-interface EcdsaParams extends Algorithm {
-    hash: string | Algorithm;
-}
-
-interface ErrorEventInit extends EventInit {
-    colno?: number;
-    error?: any;
-    filename?: string;
-    lineno?: number;
-    message?: string;
-}
-
-interface EventInit {
-    bubbles?: boolean;
-    cancelable?: boolean;
-    scoped?: boolean;
-}
-
-interface EventListenerOptions {
-    capture?: boolean;
-}
-
-interface EventModifierInit extends UIEventInit {
-    altKey?: boolean;
-    ctrlKey?: boolean;
-    metaKey?: boolean;
-    modifierAltGraph?: boolean;
-    modifierCapsLock?: boolean;
-    modifierFn?: boolean;
-    modifierFnLock?: boolean;
-    modifierHyper?: boolean;
-    modifierNumLock?: boolean;
-    modifierOS?: boolean;
-    modifierScrollLock?: boolean;
-    modifierSuper?: boolean;
-    modifierSymbol?: boolean;
-    modifierSymbolLock?: boolean;
-    shiftKey?: boolean;
-}
-
-interface ExceptionInformation {
-    domain?: string | null;
-}
-
-interface ExtendableEventInit extends EventInit {
-}
-
-interface ExtendableMessageEventInit extends ExtendableEventInit {
-    data?: any;
-    lastEventId?: string;
-    origin?: string;
-    ports?: MessagePort[] | null;
-    source?: object | ServiceWorker | MessagePort | null;
-}
-
-interface FetchEventInit extends ExtendableEventInit {
-    clientId?: string;
-    request: Request;
-    reservedClientId?: string;
-    targetClientId?: string;
-}
-
-interface FocusEventInit extends UIEventInit {
-    relatedTarget?: EventTarget | null;
-}
-
-interface FocusNavigationEventInit extends EventInit {
-    navigationReason?: string | null;
-    originHeight?: number;
-    originLeft?: number;
-    originTop?: number;
-    originWidth?: number;
-}
-
-interface FocusNavigationOrigin {
-    originHeight?: number;
-    originLeft?: number;
-    originTop?: number;
-    originWidth?: number;
-}
-
-interface GainOptions extends AudioNodeOptions {
-    gain?: number;
-}
-
-interface GamepadEventInit extends EventInit {
-    gamepad?: Gamepad;
-}
-
-interface GetNotificationOptions {
-    tag?: string;
-}
-
-interface HashChangeEventInit extends EventInit {
-    newURL?: string;
-    oldURL?: string;
-}
-
-interface HkdfParams extends Algorithm {
-    hash: string | Algorithm;
-    info: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-    salt: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-}
-
-interface HmacImportParams extends Algorithm {
-    hash: string | Algorithm;
-    length?: number;
-}
-
-interface HmacKeyAlgorithm extends KeyAlgorithm {
-    hash: KeyAlgorithm;
-    length: number;
-}
-
-interface HmacKeyGenParams extends Algorithm {
-    hash: string | Algorithm;
-    length?: number;
-}
-
-interface IDBIndexParameters {
-    multiEntry?: boolean;
-    unique?: boolean;
-}
-
-interface IDBObjectStoreParameters {
-    autoIncrement?: boolean;
-    keyPath?: string | string[];
-}
-
-interface IIRFilterOptions extends AudioNodeOptions {
-    feedback: number[];
-    feedforward: number[];
-}
-
-interface IntersectionObserverEntryInit {
-    boundingClientRect: DOMRectInit;
-    intersectionRect: DOMRectInit;
-    isIntersecting: boolean;
-    rootBounds: DOMRectInit;
-    target: Element;
-    time: number;
-}
-
-interface IntersectionObserverInit {
-    root?: Element | null;
-    rootMargin?: string;
-    threshold?: number | number[];
-}
-
-interface JsonWebKey {
-    alg?: string;
-    crv?: string;
-    d?: string;
-    dp?: string;
-    dq?: string;
-    e?: string;
-    ext?: boolean;
-    k?: string;
-    key_ops?: string[];
-    kty?: string;
-    n?: string;
-    oth?: RsaOtherPrimesInfo[];
-    p?: string;
-    q?: string;
-    qi?: string;
-    use?: string;
-    x?: string;
-    y?: string;
-}
-
-interface KeyAlgorithm {
-    name: string;
-}
-
-interface KeyboardEventInit extends EventModifierInit {
-    code?: string;
-    key?: string;
-    location?: number;
-    repeat?: boolean;
-}
-
-interface LongRange {
-    max?: number;
-    min?: number;
-}
-
-interface MSAccountInfo {
-    accountImageUri?: string;
-    accountName?: string;
-    rpDisplayName: string;
-    userDisplayName: string;
-    userId?: string;
-}
-
-interface MSAudioLocalClientEvent extends MSLocalClientEventBase {
-    cpuInsufficientEventRatio?: number;
-    deviceCaptureNotFunctioningEventRatio?: number;
-    deviceClippingEventRatio?: number;
-    deviceEchoEventRatio?: number;
-    deviceGlitchesEventRatio?: number;
-    deviceHalfDuplexAECEventRatio?: number;
-    deviceHowlingEventCount?: number;
-    deviceLowSNREventRatio?: number;
-    deviceLowSpeechLevelEventRatio?: number;
-    deviceMultipleEndpointsEventCount?: number;
-    deviceNearEndToEchoRatioEventRatio?: number;
-    deviceRenderMuteEventRatio?: number;
-    deviceRenderNotFunctioningEventRatio?: number;
-    deviceRenderZeroVolumeEventRatio?: number;
-    networkDelayEventRatio?: number;
-    networkSendQualityEventRatio?: number;
-}
-
-interface MSAudioRecvPayload extends MSPayloadBase {
-    burstLossLength1?: number;
-    burstLossLength2?: number;
-    burstLossLength3?: number;
-    burstLossLength4?: number;
-    burstLossLength5?: number;
-    burstLossLength6?: number;
-    burstLossLength7?: number;
-    burstLossLength8OrHigher?: number;
-    fecRecvDistance1?: number;
-    fecRecvDistance2?: number;
-    fecRecvDistance3?: number;
-    packetReorderDepthAvg?: number;
-    packetReorderDepthMax?: number;
-    packetReorderRatio?: number;
-    ratioCompressedSamplesAvg?: number;
-    ratioConcealedSamplesAvg?: number;
-    ratioStretchedSamplesAvg?: number;
-    samplingRate?: number;
-    signal?: MSAudioRecvSignal;
-}
-
-interface MSAudioRecvSignal {
-    initialSignalLevelRMS?: number;
-    recvNoiseLevelCh1?: number;
-    recvSignalLevelCh1?: number;
-    renderLoopbackSignalLevel?: number;
-    renderNoiseLevel?: number;
-    renderSignalLevel?: number;
-}
-
-interface MSAudioSendPayload extends MSPayloadBase {
-    audioFECUsed?: boolean;
-    samplingRate?: number;
-    sendMutePercent?: number;
-    signal?: MSAudioSendSignal;
-}
-
-interface MSAudioSendSignal {
-    noiseLevel?: number;
-    sendNoiseLevelCh1?: number;
-    sendSignalLevelCh1?: number;
-}
-
-interface MSConnectivity {
-    iceType?: MSIceType;
-    iceWarningFlags?: MSIceWarningFlags;
-    relayAddress?: MSRelayAddress;
-}
-
-interface MSCredentialFilter {
-    accept?: MSCredentialSpec[];
-}
-
-interface MSCredentialParameters {
-    type?: MSCredentialType;
-}
-
-interface MSCredentialSpec {
-    id?: string;
-    type: MSCredentialType;
-}
-
-interface MSDCCEventInit extends EventInit {
-    maxFr?: number;
-    maxFs?: number;
-}
-
-interface MSDSHEventInit extends EventInit {
-    sources?: number[];
-    timestamp?: number;
-}
-
-interface MSDelay {
-    roundTrip?: number;
-    roundTripMax?: number;
-}
-
-interface MSDescription extends RTCStats {
-    connectivity?: MSConnectivity;
-    deviceDevName?: string;
-    localAddr?: MSIPAddressInfo;
-    networkconnectivity?: MSNetworkConnectivityInfo;
-    reflexiveLocalIPAddr?: MSIPAddressInfo;
-    remoteAddr?: MSIPAddressInfo;
-    transport?: RTCIceProtocol;
-}
-
-interface MSFIDOCredentialParameters extends MSCredentialParameters {
-    algorithm?: string | Algorithm;
-    authenticators?: string[];
-}
-
-interface MSIPAddressInfo {
-    ipAddr?: string;
-    manufacturerMacAddrMask?: string;
-    port?: number;
-}
-
-interface MSIceWarningFlags {
-    allocationMessageIntegrityFailed?: boolean;
-    alternateServerReceived?: boolean;
-    connCheckMessageIntegrityFailed?: boolean;
-    connCheckOtherError?: boolean;
-    fipsAllocationFailure?: boolean;
-    multipleRelayServersAttempted?: boolean;
-    noRelayServersConfigured?: boolean;
-    portRangeExhausted?: boolean;
-    pseudoTLSFailure?: boolean;
-    tcpNatConnectivityFailed?: boolean;
-    tcpRelayConnectivityFailed?: boolean;
-    turnAuthUnknownUsernameError?: boolean;
-    turnTcpAllocateFailed?: boolean;
-    turnTcpSendFailed?: boolean;
-    turnTcpTimedOut?: boolean;
-    turnTurnTcpConnectivityFailed?: boolean;
-    turnUdpAllocateFailed?: boolean;
-    turnUdpSendFailed?: boolean;
-    udpLocalConnectivityFailed?: boolean;
-    udpNatConnectivityFailed?: boolean;
-    udpRelayConnectivityFailed?: boolean;
-    useCandidateChecksFailed?: boolean;
-}
-
-interface MSJitter {
-    interArrival?: number;
-    interArrivalMax?: number;
-    interArrivalSD?: number;
-}
-
-interface MSLocalClientEventBase extends RTCStats {
-    networkBandwidthLowEventRatio?: number;
-    networkReceiveQualityEventRatio?: number;
-}
-
-interface MSNetwork extends RTCStats {
-    delay?: MSDelay;
-    jitter?: MSJitter;
-    packetLoss?: MSPacketLoss;
-    utilization?: MSUtilization;
-}
-
-interface MSNetworkConnectivityInfo {
-    linkspeed?: number;
-    networkConnectionDetails?: string;
-    vpn?: boolean;
-}
-
-interface MSNetworkInterfaceType {
-    interfaceTypeEthernet?: boolean;
-    interfaceTypePPP?: boolean;
-    interfaceTypeTunnel?: boolean;
-    interfaceTypeWWAN?: boolean;
-    interfaceTypeWireless?: boolean;
-}
-
-interface MSOutboundNetwork extends MSNetwork {
-    appliedBandwidthLimit?: number;
-}
-
-interface MSPacketLoss {
-    lossRate?: number;
-    lossRateMax?: number;
-}
-
-interface MSPayloadBase extends RTCStats {
-    payloadDescription?: string;
-}
-
-interface MSPortRange {
-    max?: number;
-    min?: number;
-}
-
-interface MSRelayAddress {
-    port?: number;
-    relayAddress?: string;
-}
-
-interface MSSignatureParameters {
-    userPrompt?: string;
-}
-
-interface MSTransportDiagnosticsStats extends RTCStats {
-    allocationTimeInMs?: number;
-    baseAddress?: string;
-    baseInterface?: MSNetworkInterfaceType;
-    iceRole?: RTCIceRole;
-    iceWarningFlags?: MSIceWarningFlags;
-    interfaces?: MSNetworkInterfaceType;
-    localAddrType?: MSIceAddrType;
-    localAddress?: string;
-    localInterface?: MSNetworkInterfaceType;
-    localMR?: string;
-    localMRTCPPort?: number;
-    localSite?: string;
-    msRtcEngineVersion?: string;
-    networkName?: string;
-    numConsentReqReceived?: number;
-    numConsentReqSent?: number;
-    numConsentRespReceived?: number;
-    numConsentRespSent?: number;
-    portRangeMax?: number;
-    portRangeMin?: number;
-    protocol?: RTCIceProtocol;
-    remoteAddrType?: MSIceAddrType;
-    remoteAddress?: string;
-    remoteMR?: string;
-    remoteMRTCPPort?: number;
-    remoteSite?: string;
-    rtpRtcpMux?: boolean;
-    stunVer?: number;
-}
-
-interface MSUtilization {
-    bandwidthEstimation?: number;
-    bandwidthEstimationAvg?: number;
-    bandwidthEstimationMax?: number;
-    bandwidthEstimationMin?: number;
-    bandwidthEstimationStdDev?: number;
-    packets?: number;
-}
-
-interface MSVideoPayload extends MSPayloadBase {
-    durationSeconds?: number;
-    resolution?: string;
-    videoBitRateAvg?: number;
-    videoBitRateMax?: number;
-    videoFrameRateAvg?: number;
-    videoPacketLossRate?: number;
-}
-
-interface MSVideoRecvPayload extends MSVideoPayload {
-    lowBitRateCallPercent?: number;
-    lowFrameRateCallPercent?: number;
-    recvBitRateAverage?: number;
-    recvBitRateMaximum?: number;
-    recvCodecType?: string;
-    recvFpsHarmonicAverage?: number;
-    recvFrameRateAverage?: number;
-    recvNumResSwitches?: number;
-    recvReorderBufferMaxSuccessfullyOrderedExtent?: number;
-    recvReorderBufferMaxSuccessfullyOrderedLateTime?: number;
-    recvReorderBufferPacketsDroppedDueToBufferExhaustion?: number;
-    recvReorderBufferPacketsDroppedDueToTimeout?: number;
-    recvReorderBufferReorderedPackets?: number;
-    recvResolutionHeight?: number;
-    recvResolutionWidth?: number;
-    recvVideoStreamsMax?: number;
-    recvVideoStreamsMin?: number;
-    recvVideoStreamsMode?: number;
-    reorderBufferTotalPackets?: number;
-    videoFrameLossRate?: number;
-    videoPostFECPLR?: number;
-    videoResolutions?: MSVideoResolutionDistribution;
-}
-
-interface MSVideoResolutionDistribution {
-    cifQuality?: number;
-    h1080Quality?: number;
-    h1440Quality?: number;
-    h2160Quality?: number;
-    h720Quality?: number;
-    vgaQuality?: number;
-}
-
-interface MSVideoSendPayload extends MSVideoPayload {
-    sendBitRateAverage?: number;
-    sendBitRateMaximum?: number;
-    sendFrameRateAverage?: number;
-    sendResolutionHeight?: number;
-    sendResolutionWidth?: number;
-    sendVideoStreamsMax?: number;
-}
-
-interface MediaElementAudioSourceOptions {
-    mediaElement: HTMLMediaElement;
-}
-
-interface MediaEncryptedEventInit extends EventInit {
-    initData?: ArrayBuffer | null;
-    initDataType?: string;
-}
-
-interface MediaKeyMessageEventInit extends EventInit {
-    message?: ArrayBuffer | null;
-    messageType?: MediaKeyMessageType;
-}
-
-interface MediaKeySystemConfiguration {
-    audioCapabilities?: MediaKeySystemMediaCapability[];
-    distinctiveIdentifier?: MediaKeysRequirement;
-    initDataTypes?: string[];
-    persistentState?: MediaKeysRequirement;
-    videoCapabilities?: MediaKeySystemMediaCapability[];
-}
-
-interface MediaKeySystemMediaCapability {
-    contentType?: string;
-    robustness?: string;
-}
-
-interface MediaStreamConstraints {
-    audio?: boolean | MediaTrackConstraints;
-    video?: boolean | MediaTrackConstraints;
-}
-
-interface MediaStreamErrorEventInit extends EventInit {
-    error?: MediaStreamError | null;
-}
-
-interface MediaStreamEventInit extends EventInit {
-    stream?: MediaStream;
-}
-
-interface MediaStreamTrackEventInit extends EventInit {
-    track?: MediaStreamTrack | null;
-}
-
-interface MediaTrackCapabilities {
-    aspectRatio?: number | DoubleRange;
-    deviceId?: string;
-    echoCancellation?: boolean[];
-    facingMode?: string;
-    frameRate?: number | DoubleRange;
-    groupId?: string;
-    height?: number | LongRange;
-    sampleRate?: number | LongRange;
-    sampleSize?: number | LongRange;
-    volume?: number | DoubleRange;
-    width?: number | LongRange;
-}
-
-interface MediaTrackConstraintSet {
-    aspectRatio?: number | ConstrainDoubleRange;
-    channelCount?: number | ConstrainLongRange;
-    deviceId?: string | string[] | ConstrainDOMStringParameters;
-    displaySurface?: string | string[] | ConstrainDOMStringParameters;
-    echoCancellation?: boolean | ConstrainBooleanParameters;
-    facingMode?: string | string[] | ConstrainDOMStringParameters;
-    frameRate?: number | ConstrainDoubleRange;
-    groupId?: string | string[] | ConstrainDOMStringParameters;
-    height?: number | ConstrainLongRange;
-    latency?: number | ConstrainDoubleRange;
-    logicalSurface?: boolean | ConstrainBooleanParameters;
-    sampleRate?: number | ConstrainLongRange;
-    sampleSize?: number | ConstrainLongRange;
-    volume?: number | ConstrainDoubleRange;
-    width?: number | ConstrainLongRange;
-}
-
-interface MediaTrackConstraints extends MediaTrackConstraintSet {
-    advanced?: MediaTrackConstraintSet[];
-}
-
-interface MediaTrackSettings {
-    aspectRatio?: number;
-    deviceId?: string;
-    echoCancellation?: boolean;
-    facingMode?: string;
-    frameRate?: number;
-    groupId?: string;
-    height?: number;
-    sampleRate?: number;
-    sampleSize?: number;
-    volume?: number;
-    width?: number;
-}
-
-interface MediaTrackSupportedConstraints {
-    aspectRatio?: boolean;
-    deviceId?: boolean;
-    echoCancellation?: boolean;
-    facingMode?: boolean;
-    frameRate?: boolean;
-    groupId?: boolean;
-    height?: boolean;
-    sampleRate?: boolean;
-    sampleSize?: boolean;
-    volume?: boolean;
-    width?: boolean;
-}
-
-interface MessageEventInit extends EventInit {
-    channel?: string;
-    data?: any;
-    lastEventId?: string;
-    origin?: string;
-    ports?: MessagePort[];
-    source?: Window | null;
-}
-
-interface MouseEventInit extends EventModifierInit {
-    button?: number;
-    buttons?: number;
-    clientX?: number;
-    clientY?: number;
-    relatedTarget?: EventTarget | null;
-    screenX?: number;
-    screenY?: number;
-}
-
-interface MsZoomToOptions {
-    animate?: string;
-    contentX?: number;
-    contentY?: number;
-    scaleFactor?: number;
-    viewportX?: string | null;
-    viewportY?: string | null;
-}
-
-interface MutationObserverInit {
-    attributeFilter?: string[];
-    attributeOldValue?: boolean;
-    attributes?: boolean;
-    characterData?: boolean;
-    characterDataOldValue?: boolean;
-    childList?: boolean;
-    subtree?: boolean;
-}
-
-interface NotificationEventInit extends ExtendableEventInit {
-    action?: string;
-    notification: Notification;
-}
-
-interface NotificationOptions {
-    body?: string;
-    data?: any;
-    dir?: NotificationDirection;
-    icon?: string;
-    lang?: string;
-    tag?: string;
-}
-
-interface ObjectURLOptions {
-    oneTimeOnly?: boolean;
-}
-
-interface OfflineAudioCompletionEventInit extends EventInit {
-    renderedBuffer: AudioBuffer;
-}
-
-interface OscillatorOptions extends AudioNodeOptions {
-    detune?: number;
-    frequency?: number;
-    periodicWave?: PeriodicWave;
-    type?: OscillatorType;
-}
-
-interface PannerOptions extends AudioNodeOptions {
-    coneInnerAngle?: number;
-    coneOuterAngle?: number;
-    coneOuterGain?: number;
-    distanceModel?: DistanceModelType;
-    maxDistance?: number;
-    orientationX?: number;
-    orientationY?: number;
-    orientationZ?: number;
-    panningModel?: PanningModelType;
-    positionX?: number;
-    positionY?: number;
-    positionZ?: number;
-    refDistance?: number;
-    rolloffFactor?: number;
-}
-
-interface PaymentCurrencyAmount {
-    currency: string;
-    currencySystem?: string;
-    value: string;
-}
-
-interface PaymentDetailsBase {
-    displayItems?: PaymentItem[];
-    modifiers?: PaymentDetailsModifier[];
-    shippingOptions?: PaymentShippingOption[];
-}
-
-interface PaymentDetailsInit extends PaymentDetailsBase {
-    id?: string;
-    total: PaymentItem;
-}
-
-interface PaymentDetailsModifier {
-    additionalDisplayItems?: PaymentItem[];
-    data?: any;
-    supportedMethods: string | string[];
-    total?: PaymentItem;
-}
-
-interface PaymentDetailsUpdate extends PaymentDetailsBase {
-    error?: string;
-    total?: PaymentItem;
-}
-
-interface PaymentItem {
-    amount: PaymentCurrencyAmount;
-    label: string;
-    pending?: boolean;
-}
-
-interface PaymentMethodData {
-    data?: any;
-    supportedMethods: string | string[];
-}
-
-interface PaymentOptions {
-    requestPayerEmail?: boolean;
-    requestPayerName?: boolean;
-    requestPayerPhone?: boolean;
-    requestShipping?: boolean;
-    shippingType?: string;
-}
-
-interface PaymentRequestUpdateEventInit extends EventInit {
-}
-
-interface PaymentShippingOption {
-    amount: PaymentCurrencyAmount;
-    id: string;
-    label: string;
-    selected?: boolean;
-}
-
-interface Pbkdf2Params extends Algorithm {
-    hash: string | Algorithm;
-    iterations: number;
-    salt: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-}
-
-interface PeriodicWaveConstraints {
-    disableNormalization?: boolean;
-}
-
-interface PeriodicWaveOptions extends PeriodicWaveConstraints {
-    imag?: number[];
-    real?: number[];
-}
-
-interface PointerEventInit extends MouseEventInit {
-    height?: number;
-    isPrimary?: boolean;
-    pointerId?: number;
-    pointerType?: string;
-    pressure?: number;
-    tiltX?: number;
-    tiltY?: number;
-    width?: number;
-}
-
-interface PopStateEventInit extends EventInit {
-    state?: any;
-}
-
-interface PositionOptions {
-    enableHighAccuracy?: boolean;
-    maximumAge?: number;
-    timeout?: number;
-}
-
-interface ProgressEventInit extends EventInit {
-    lengthComputable?: boolean;
-    loaded?: number;
-    total?: number;
-}
-
-interface PushEventInit extends ExtendableEventInit {
-    data?: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | string | null;
-}
-
-interface PushSubscriptionChangeInit extends ExtendableEventInit {
-    newSubscription?: PushSubscription;
-    oldSubscription?: PushSubscription;
-}
-
-interface PushSubscriptionOptionsInit {
-    applicationServerKey?: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | string | null;
-    userVisibleOnly?: boolean;
-}
-
-interface QueuingStrategy {
-    highWaterMark?: number;
-    size?: WritableStreamChunkCallback;
-}
-
-interface RTCConfiguration {
-    bundlePolicy?: RTCBundlePolicy;
-    iceServers?: RTCIceServer[];
-    iceTransportPolicy?: RTCIceTransportPolicy;
-    peerIdentity?: string;
-}
-
-interface RTCDTMFToneChangeEventInit extends EventInit {
-    tone?: string;
-}
-
-interface RTCDtlsFingerprint {
-    algorithm?: string;
-    value?: string;
-}
-
-interface RTCDtlsParameters {
-    fingerprints?: RTCDtlsFingerprint[];
-    role?: RTCDtlsRole;
-}
-
-interface RTCIceCandidateAttributes extends RTCStats {
-    addressSourceUrl?: string;
-    candidateType?: RTCStatsIceCandidateType;
-    ipAddress?: string;
-    portNumber?: number;
-    priority?: number;
-    transport?: string;
-}
-
-interface RTCIceCandidateComplete {
-}
-
-interface RTCIceCandidateDictionary {
-    foundation?: string;
-    ip?: string;
-    msMTurnSessionId?: string;
-    port?: number;
-    priority?: number;
-    protocol?: RTCIceProtocol;
-    relatedAddress?: string;
-    relatedPort?: number;
-    tcpType?: RTCIceTcpCandidateType;
-    type?: RTCIceCandidateType;
-}
-
-interface RTCIceCandidateInit {
-    candidate?: string;
-    sdpMLineIndex?: number;
-    sdpMid?: string;
-}
-
-interface RTCIceCandidatePair {
-    local?: RTCIceCandidateDictionary;
-    remote?: RTCIceCandidateDictionary;
-}
-
-interface RTCIceCandidatePairStats extends RTCStats {
-    availableIncomingBitrate?: number;
-    availableOutgoingBitrate?: number;
-    bytesReceived?: number;
-    bytesSent?: number;
-    localCandidateId?: string;
-    nominated?: boolean;
-    priority?: number;
-    readable?: boolean;
-    remoteCandidateId?: string;
-    roundTripTime?: number;
-    state?: RTCStatsIceCandidatePairState;
-    transportId?: string;
-    writable?: boolean;
-}
-
-interface RTCIceGatherOptions {
-    gatherPolicy?: RTCIceGatherPolicy;
-    iceservers?: RTCIceServer[];
-    portRange?: MSPortRange;
-}
-
-interface RTCIceParameters {
-    iceLite?: boolean | null;
-    password?: string;
-    usernameFragment?: string;
-}
-
-interface RTCIceServer {
-    credential?: string | null;
-    urls?: any;
-    username?: string | null;
-}
-
-interface RTCInboundRTPStreamStats extends RTCRTPStreamStats {
-    bytesReceived?: number;
-    fractionLost?: number;
-    jitter?: number;
-    packetsLost?: number;
-    packetsReceived?: number;
-}
-
-interface RTCMediaStreamTrackStats extends RTCStats {
-    audioLevel?: number;
-    echoReturnLoss?: number;
-    echoReturnLossEnhancement?: number;
-    frameHeight?: number;
-    frameWidth?: number;
-    framesCorrupted?: number;
-    framesDecoded?: number;
-    framesDropped?: number;
-    framesPerSecond?: number;
-    framesReceived?: number;
-    framesSent?: number;
-    remoteSource?: boolean;
-    ssrcIds?: string[];
-    trackIdentifier?: string;
-}
-
-interface RTCOfferOptions {
-    iceRestart?: boolean;
-    offerToReceiveAudio?: number;
-    offerToReceiveVideo?: number;
-    voiceActivityDetection?: boolean;
-}
-
-interface RTCOutboundRTPStreamStats extends RTCRTPStreamStats {
-    bytesSent?: number;
-    packetsSent?: number;
-    roundTripTime?: number;
-    targetBitrate?: number;
-}
-
-interface RTCPeerConnectionIceEventInit extends EventInit {
-    candidate?: RTCIceCandidate;
-}
-
-interface RTCRTPStreamStats extends RTCStats {
-    associateStatsId?: string;
-    codecId?: string;
-    firCount?: number;
-    isRemote?: boolean;
-    mediaTrackId?: string;
-    mediaType?: string;
-    nackCount?: number;
-    pliCount?: number;
-    sliCount?: number;
-    ssrc?: string;
-    transportId?: string;
-}
-
-interface RTCRtcpFeedback {
-    parameter?: string;
-    type?: string;
-}
-
-interface RTCRtcpParameters {
-    cname?: string;
-    mux?: boolean;
-    reducedSize?: boolean;
-    ssrc?: number;
-}
-
-interface RTCRtpCapabilities {
-    codecs?: RTCRtpCodecCapability[];
-    fecMechanisms?: string[];
-    headerExtensions?: RTCRtpHeaderExtension[];
-}
-
-interface RTCRtpCodecCapability {
-    clockRate?: number;
-    kind?: string;
-    maxSpatialLayers?: number;
-    maxTemporalLayers?: number;
-    maxptime?: number;
-    name?: string;
-    numChannels?: number;
-    options?: any;
-    parameters?: any;
-    preferredPayloadType?: number;
-    ptime?: number;
-    rtcpFeedback?: RTCRtcpFeedback[];
-    svcMultiStreamSupport?: boolean;
-}
-
-interface RTCRtpCodecParameters {
-    clockRate?: number;
-    maxptime?: number;
-    name?: string;
-    numChannels?: number;
-    parameters?: any;
-    payloadType?: number;
-    ptime?: number;
-    rtcpFeedback?: RTCRtcpFeedback[];
-}
-
-interface RTCRtpContributingSource {
-    audioLevel?: number;
-    csrc?: number;
-    timestamp?: number;
-}
-
-interface RTCRtpEncodingParameters {
-    active?: boolean;
-    codecPayloadType?: number;
-    dependencyEncodingIds?: string[];
-    encodingId?: string;
-    fec?: RTCRtpFecParameters;
-    framerateScale?: number;
-    maxBitrate?: number;
-    maxFramerate?: number;
-    minQuality?: number;
-    priority?: number;
-    resolutionScale?: number;
-    rtx?: RTCRtpRtxParameters;
-    ssrc?: number;
-    ssrcRange?: RTCSsrcRange;
-}
-
-interface RTCRtpFecParameters {
-    mechanism?: string;
-    ssrc?: number;
-}
-
-interface RTCRtpHeaderExtension {
-    kind?: string;
-    preferredEncrypt?: boolean;
-    preferredId?: number;
-    uri?: string;
-}
-
-interface RTCRtpHeaderExtensionParameters {
-    encrypt?: boolean;
-    id?: number;
-    uri?: string;
-}
-
-interface RTCRtpParameters {
-    codecs?: RTCRtpCodecParameters[];
-    degradationPreference?: RTCDegradationPreference;
-    encodings?: RTCRtpEncodingParameters[];
-    headerExtensions?: RTCRtpHeaderExtensionParameters[];
-    muxId?: string;
-    rtcp?: RTCRtcpParameters;
-}
-
-interface RTCRtpRtxParameters {
-    ssrc?: number;
-}
-
-interface RTCRtpUnhandled {
-    muxId?: string;
-    payloadType?: number;
-    ssrc?: number;
-}
-
-interface RTCSessionDescriptionInit {
-    sdp?: string;
-    type?: RTCSdpType;
-}
-
-interface RTCSrtpKeyParam {
-    keyMethod?: string;
-    keySalt?: string;
-    lifetime?: string;
-    mkiLength?: number;
-    mkiValue?: number;
-}
-
-interface RTCSrtpSdesParameters {
-    cryptoSuite?: string;
-    keyParams?: RTCSrtpKeyParam[];
-    sessionParams?: string[];
-    tag?: number;
-}
-
-interface RTCSsrcRange {
-    max?: number;
-    min?: number;
-}
-
-interface RTCStats {
-    id?: string;
-    msType?: MSStatsType;
-    timestamp?: number;
-    type?: RTCStatsType;
-}
-
-interface RTCStatsReport {
-}
-
-interface RTCTransportStats extends RTCStats {
-    activeConnection?: boolean;
-    bytesReceived?: number;
-    bytesSent?: number;
-    localCertificateId?: string;
-    remoteCertificateId?: string;
-    rtcpTransportStatsId?: string;
-    selectedCandidatePairId?: string;
-}
-
-interface RegistrationOptions {
-    scope?: string;
-}
-
-interface RequestInit {
-    body?: Blob | Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | FormData | string | null;
-    cache?: RequestCache;
-    credentials?: RequestCredentials;
-    headers?: HeadersInit;
-    integrity?: string;
-    keepalive?: boolean;
-    method?: string;
-    mode?: RequestMode;
-    redirect?: RequestRedirect;
-    referrer?: string;
-    referrerPolicy?: ReferrerPolicy;
-    signal?: AbortSignal;
-    window?: any;
-}
-
-interface ResponseInit {
-    headers?: HeadersInit;
-    status?: number;
-    statusText?: string;
-}
-
-interface RsaHashedImportParams extends Algorithm {
-    hash: string | Algorithm;
-}
-
-interface RsaHashedKeyAlgorithm extends RsaKeyAlgorithm {
-    hash: KeyAlgorithm;
-}
-
-interface RsaHashedKeyGenParams extends RsaKeyGenParams {
-    hash: string | Algorithm;
-}
-
-interface RsaKeyAlgorithm extends KeyAlgorithm {
-    modulusLength: number;
-    publicExponent: Uint8Array;
-}
-
-interface RsaKeyGenParams extends Algorithm {
-    modulusLength: number;
-    publicExponent: Uint8Array;
-}
-
-interface RsaOaepParams extends Algorithm {
-    label?: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-}
-
-interface RsaOtherPrimesInfo {
-    d?: string;
-    r?: string;
-    t?: string;
-}
-
-interface RsaPssParams extends Algorithm {
-    saltLength: number;
-}
-
-interface ScopedCredentialDescriptor {
-    id: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-    transports?: Transport[];
-    type: ScopedCredentialType;
-}
-
-interface ScopedCredentialOptions {
-    excludeList?: ScopedCredentialDescriptor[];
-    extensions?: WebAuthnExtensions;
-    rpId?: string;
-    timeoutSeconds?: number;
-}
-
-interface ScopedCredentialParameters {
-    algorithm: string | Algorithm;
-    type: ScopedCredentialType;
-}
-
-interface SecurityPolicyViolationEventInit extends EventInit {
-    blockedURI?: string;
-    columnNumber?: number;
-    documentURI?: string;
-    effectiveDirective?: string;
-    lineNumber?: number;
-    originalPolicy?: string;
-    referrer?: string;
-    sourceFile?: string;
-    statusCode?: number;
-    violatedDirective?: string;
-}
-
-interface ServiceWorkerMessageEventInit extends EventInit {
-    data?: any;
-    lastEventId?: string;
-    origin?: string;
-    ports?: MessagePort[] | null;
-    source?: ServiceWorker | MessagePort | null;
-}
-
-interface SpeechSynthesisEventInit extends EventInit {
-    charIndex?: number;
-    charLength?: number;
-    elapsedTime?: number;
-    name?: string;
-    utterance?: SpeechSynthesisUtterance | null;
-}
-
-interface StereoPannerOptions extends AudioNodeOptions {
-    pan?: number;
-}
-
-interface StoreExceptionsInformation extends ExceptionInformation {
-    detailURI?: string | null;
-    explanationString?: string | null;
-    siteName?: string | null;
-}
-
-interface StoreSiteSpecificExceptionsInformation extends StoreExceptionsInformation {
-    arrayOfDomainStrings?: string[];
-}
-
-interface SyncEventInit extends ExtendableEventInit {
-    lastChance?: boolean;
-    tag: string;
-}
-
-interface TextDecodeOptions {
-    stream?: boolean;
-}
-
-interface TextDecoderOptions {
-    fatal?: boolean;
-    ignoreBOM?: boolean;
-}
-
-interface TrackEventInit extends EventInit {
-    track?: VideoTrack | AudioTrack | TextTrack | null;
-}
-
-interface TransitionEventInit extends EventInit {
-    elapsedTime?: number;
-    propertyName?: string;
-}
-
-interface UIEventInit extends EventInit {
-    detail?: number;
-    view?: Window | null;
-}
-
-interface UnderlyingSink {
-    abort?: WritableStreamErrorCallback;
-    close?: WritableStreamDefaultControllerCallback;
-    start: WritableStreamDefaultControllerCallback;
-    write?: WritableStreamChunkCallback;
-}
-
-interface VRDisplayEventInit extends EventInit {
-    display: VRDisplay;
-    reason?: VRDisplayEventReason;
-}
-
-interface VRLayer {
-    leftBounds?: number[] | null;
-    rightBounds?: number[] | null;
-    source?: HTMLCanvasElement | null;
-}
-
-interface VRStageParameters {
-    sittingToStandingTransform?: Float32Array;
-    sizeX?: number;
-    sizeY?: number;
-}
-
-interface WaveShaperOptions extends AudioNodeOptions {
-    curve?: number[];
-    oversample?: OverSampleType;
-}
-
-interface WebAuthnExtensions {
-}
-
-interface WebGLContextAttributes {
-    alpha?: boolean;
-    antialias?: boolean;
-    depth?: boolean;
-    failIfMajorPerformanceCaveat?: boolean;
-    premultipliedAlpha?: boolean;
-    preserveDrawingBuffer?: boolean;
-    stencil?: boolean;
-}
-
-interface WebGLContextEventInit extends EventInit {
-    statusMessage?: string;
-}
-
-interface WheelEventInit extends MouseEventInit {
-    deltaMode?: number;
-    deltaX?: number;
-    deltaY?: number;
-    deltaZ?: number;
-}
-
-interface EventListener {
-    (evt: Event): void;
-}
-
-type WebKitEntriesCallback = ((entries: WebKitEntry[]) => void) | { handleEvent(entries: WebKitEntry[]): void; };
-
-type WebKitErrorCallback = ((err: DOMError) => void) | { handleEvent(err: DOMError): void; };
-
-type WebKitFileCallback = ((file: File) => void) | { handleEvent(file: File): void; };
-
-interface ANGLE_instanced_arrays {
-    drawArraysInstancedANGLE(mode: number, first: number, count: number, primcount: number): void;
-    drawElementsInstancedANGLE(mode: number, count: number, type: number, offset: number, primcount: number): void;
-    vertexAttribDivisorANGLE(index: number, divisor: number): void;
-    readonly VERTEX_ATTRIB_ARRAY_DIVISOR_ANGLE: number;
-}
-
-declare var ANGLE_instanced_arrays: {
-    prototype: ANGLE_instanced_arrays;
-    new(): ANGLE_instanced_arrays;
-    readonly VERTEX_ATTRIB_ARRAY_DIVISOR_ANGLE: number;
-};
-
-interface AbortController {
-    readonly signal: AbortSignal;
-    abort(): void;
-}
-
-declare var AbortController: {
-    prototype: AbortController;
-    new(): AbortController;
-};
-
-interface AbortSignalEventMap {
-    "abort": ProgressEvent;
-}
-
-interface AbortSignal extends EventTarget {
-    readonly aborted: boolean;
-    onabort: ((this: AbortSignal, ev: ProgressEvent) => any) | null;
-    addEventListener<K extends keyof AbortSignalEventMap>(type: K, listener: (this: AbortSignal, ev: AbortSignalEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof AbortSignalEventMap>(type: K, listener: (this: AbortSignal, ev: AbortSignalEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var AbortSignal: {
-    prototype: AbortSignal;
-    new(): AbortSignal;
-};
-
-interface AbstractWorkerEventMap {
-    "error": ErrorEvent;
-}
-
-interface AbstractWorker {
-    onerror: ((this: AbstractWorker, ev: ErrorEvent) => any) | null;
-    addEventListener<K extends keyof AbstractWorkerEventMap>(type: K, listener: (this: AbstractWorker, ev: AbstractWorkerEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof AbstractWorkerEventMap>(type: K, listener: (this: AbstractWorker, ev: AbstractWorkerEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-interface AesCfbParams extends Algorithm {
-    iv: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer;
-}
-
-interface AesCmacParams extends Algorithm {
-    length: number;
-}
-
-interface AnalyserNode extends AudioNode {
-    fftSize: number;
-    readonly frequencyBinCount: number;
-    maxDecibels: number;
-    minDecibels: number;
-    smoothingTimeConstant: number;
-    getByteFrequencyData(array: Uint8Array): void;
-    getByteTimeDomainData(array: Uint8Array): void;
-    getFloatFrequencyData(array: Float32Array): void;
-    getFloatTimeDomainData(array: Float32Array): void;
-}
-
-declare var AnalyserNode: {
-    prototype: AnalyserNode;
-    new(): AnalyserNode;
-};
-
-interface Animation {
-    currentTime: number | null;
-    effect: AnimationEffectReadOnly;
-    readonly finished: Promise<Animation>;
-    id: string;
-    readonly pending: boolean;
-    readonly playState: "idle" | "running" | "paused" | "finished";
-    playbackRate: number;
-    readonly ready: Promise<Animation>;
-    startTime: number;
-    timeline: AnimationTimeline;
-    cancel(): void;
-    finish(): void;
-    oncancel: (this: Animation, ev: AnimationPlaybackEvent) => any;
-    onfinish: (this: Animation, ev: AnimationPlaybackEvent) => any;
-    pause(): void;
-    play(): void;
-    reverse(): void;
-}
-
-declare var Animation: {
-    prototype: Animation;
-    new(effect?: AnimationEffectReadOnly, timeline?: AnimationTimeline): Animation;
-};
-
-interface AnimationEffectReadOnly {
-    readonly timing: number;
-    getComputedTiming(): ComputedTimingProperties;
-}
-
-interface AnimationEvent extends Event {
-    readonly animationName: string;
-    readonly elapsedTime: number;
-}
-
-declare var AnimationEvent: {
-    prototype: AnimationEvent;
-    new(typeArg: string, eventInitDict?: AnimationEventInit): AnimationEvent;
-};
-
-interface AnimationKeyFrame {
-    easing?: string | string[];
-    offset?: number | null | (number | null)[];
-    [index: string]: string | number | number[] | string[] | null | (number | null)[] | undefined;
-}
-
-interface AnimationOptions {
-    delay?: number;
-    direction?: "normal" | "reverse" | "alternate" | "alternate-reverse";
-    duration?: number;
-    easing?: string;
-    endDelay?: number;
-    fill?: "none" | "forwards" | "backwards" | "both"| "auto";
-    id?: string;
-    iterationStart?: number;
-    iterations?: number;
-}
-
-interface AnimationPlaybackEvent extends Event {
-    readonly currentTime: number | null;
-    readonly timelineTime: number | null;
-}
-
-declare var AnimationPlaybackEvent: {
-    prototype: AnimationPlaybackEvent;
-    new(type: string, eventInitDict?: AnimationPlaybackEventInit): AnimationPlaybackEvent;
-};
-
-interface AnimationPlaybackEventInit extends EventInit {
-    currentTime?: number | null;
-    timelineTime?: number | null;
-}
-
-interface AnimationTimeline {
-    readonly currentTime: number | null;
-}
-
-interface ApplicationCacheEventMap {
-    "cached": Event;
-    "checking": Event;
-    "downloading": Event;
-    "error": Event;
-    "noupdate": Event;
-    "obsolete": Event;
-    "progress": ProgressEvent;
-    "updateready": Event;
-}
-
-interface ApplicationCache extends EventTarget {
-    oncached: ((this: ApplicationCache, ev: Event) => any) | null;
-    onchecking: ((this: ApplicationCache, ev: Event) => any) | null;
-    ondownloading: ((this: ApplicationCache, ev: Event) => any) | null;
-    onerror: ((this: ApplicationCache, ev: Event) => any) | null;
-    onnoupdate: ((this: ApplicationCache, ev: Event) => any) | null;
-    onobsolete: ((this: ApplicationCache, ev: Event) => any) | null;
-    onprogress: ((this: ApplicationCache, ev: ProgressEvent) => any) | null;
-    onupdateready: ((this: ApplicationCache, ev: Event) => any) | null;
-    readonly status: number;
-    abort(): void;
-    swapCache(): void;
-    update(): void;
-    readonly CHECKING: number;
-    readonly DOWNLOADING: number;
-    readonly IDLE: number;
-    readonly OBSOLETE: number;
-    readonly UNCACHED: number;
-    readonly UPDATEREADY: number;
-    addEventListener<K extends keyof ApplicationCacheEventMap>(type: K, listener: (this: ApplicationCache, ev: ApplicationCacheEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof ApplicationCacheEventMap>(type: K, listener: (this: ApplicationCache, ev: ApplicationCacheEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var ApplicationCache: {
-    prototype: ApplicationCache;
-    new(): ApplicationCache;
-    readonly CHECKING: number;
-    readonly DOWNLOADING: number;
-    readonly IDLE: number;
-    readonly OBSOLETE: number;
-    readonly UNCACHED: number;
-    readonly UPDATEREADY: number;
-};
-
-interface AssignedNodesOptions {
-    flatten?: boolean;
-}
-
-interface Attr extends Node {
-    readonly name: string;
-    readonly ownerElement: Element | null;
-    readonly prefix: string | null;
-    readonly specified: boolean;
-    value: string;
-}
-
-declare var Attr: {
-    prototype: Attr;
-    new(): Attr;
-};
-
-interface AudioBuffer {
-    readonly duration: number;
-    readonly length: number;
-    readonly numberOfChannels: number;
-    readonly sampleRate: number;
-    copyFromChannel(destination: Float32Array, channelNumber: number, startInChannel?: number): void;
-    copyToChannel(source: Float32Array, channelNumber: number, startInChannel?: number): void;
-    getChannelData(channel: number): Float32Array;
-}
-
-declare var AudioBuffer: {
-    prototype: AudioBuffer;
-    new(): AudioBuffer;
-};
-
-interface AudioBufferSourceNodeEventMap {
-    "ended": Event;
-}
-
-interface AudioBufferSourceNode extends AudioNode {
-    buffer: AudioBuffer | null;
-    readonly detune: AudioParam;
-    loop: boolean;
-    loopEnd: number;
-    loopStart: number;
-    onended: ((this: AudioBufferSourceNode, ev: Event) => any) | null;
-    readonly playbackRate: AudioParam;
-    start(when?: number, offset?: number, duration?: number): void;
-    stop(when?: number): void;
-    addEventListener<K extends keyof AudioBufferSourceNodeEventMap>(type: K, listener: (this: AudioBufferSourceNode, ev: AudioBufferSourceNodeEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof AudioBufferSourceNodeEventMap>(type: K, listener: (this: AudioBufferSourceNode, ev: AudioBufferSourceNodeEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var AudioBufferSourceNode: {
-    prototype: AudioBufferSourceNode;
-    new(): AudioBufferSourceNode;
-};
-
-interface AudioContextEventMap {
-    "statechange": Event;
-}
-
-interface AudioContextBase extends EventTarget {
-    readonly currentTime: number;
-    readonly destination: AudioDestinationNode;
-    readonly listener: AudioListener;
-    onstatechange: ((this: AudioContext, ev: Event) => any) | null;
-    readonly sampleRate: number;
-    readonly state: AudioContextState;
-    close(): Promise<void>;
-    createAnalyser(): AnalyserNode;
-    createBiquadFilter(): BiquadFilterNode;
-    createBuffer(numberOfChannels: number, length: number, sampleRate: number): AudioBuffer;
-    createBufferSource(): AudioBufferSourceNode;
-    createChannelMerger(numberOfInputs?: number): ChannelMergerNode;
-    createChannelSplitter(numberOfOutputs?: number): ChannelSplitterNode;
-    createConvolver(): ConvolverNode;
-    createDelay(maxDelayTime?: number): DelayNode;
-    createDynamicsCompressor(): DynamicsCompressorNode;
-    createGain(): GainNode;
-    createIIRFilter(feedforward: number[], feedback: number[]): IIRFilterNode;
-    createMediaElementSource(mediaElement: HTMLMediaElement): MediaElementAudioSourceNode;
-    createMediaStreamSource(mediaStream: MediaStream): MediaStreamAudioSourceNode;
-    createOscillator(): OscillatorNode;
-    createPanner(): PannerNode;
-    createPeriodicWave(real: Float32Array, imag: Float32Array, constraints?: PeriodicWaveConstraints): PeriodicWave;
-    createScriptProcessor(bufferSize?: number, numberOfInputChannels?: number, numberOfOutputChannels?: number): ScriptProcessorNode;
-    createStereoPanner(): StereoPannerNode;
-    createWaveShaper(): WaveShaperNode;
-    decodeAudioData(audioData: ArrayBuffer, successCallback?: DecodeSuccessCallback, errorCallback?: DecodeErrorCallback): Promise<AudioBuffer>;
-    resume(): Promise<void>;
-    addEventListener<K extends keyof AudioContextEventMap>(type: K, listener: (this: AudioContext, ev: AudioContextEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof AudioContextEventMap>(type: K, listener: (this: AudioContext, ev: AudioContextEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-interface AudioContext extends AudioContextBase {
-    suspend(): Promise<void>;
-}
-
-declare var AudioContext: {
-    prototype: AudioContext;
-    new(): AudioContext;
-};
-
-interface AudioDestinationNode extends AudioNode {
-    readonly maxChannelCount: number;
-}
-
-declare var AudioDestinationNode: {
-    prototype: AudioDestinationNode;
-    new(): AudioDestinationNode;
-};
-
-interface AudioListener {
-    /** @deprecated */
-    dopplerFactor: number;
-    /** @deprecated */
-    speedOfSound: number;
-    /** @deprecated */
-    setOrientation(x: number, y: number, z: number, xUp: number, yUp: number, zUp: number): void;
-    /** @deprecated */
-    setPosition(x: number, y: number, z: number): void;
-    /** @deprecated */
-    setVelocity(x: number, y: number, z: number): void;
-}
-
-declare var AudioListener: {
-    prototype: AudioListener;
-    new(): AudioListener;
-};
-
-interface AudioNode extends EventTarget {
-    channelCount: number;
-    channelCountMode: ChannelCountMode;
-    channelInterpretation: ChannelInterpretation;
-    readonly context: AudioContext;
-    readonly numberOfInputs: number;
-    readonly numberOfOutputs: number;
-    connect(destination: AudioNode, output?: number, input?: number): AudioNode;
-    connect(destination: AudioParam, output?: number): void;
-    disconnect(): void;
-    disconnect(output: number): void;
-    disconnect(destination: AudioNode): void;
-    disconnect(destination: AudioNode, output: number): void;
-    disconnect(destination: AudioNode, output: number, input: number): void;
-    disconnect(destination: AudioParam): void;
-    disconnect(destination: AudioParam, output: number): void;
-}
-
-declare var AudioNode: {
-    prototype: AudioNode;
-    new(): AudioNode;
-};
-
-interface AudioParam {
-    readonly defaultValue: number;
-    value: number;
-    cancelScheduledValues(cancelTime: number): AudioParam;
-    exponentialRampToValueAtTime(value: number, endTime: number): AudioParam;
-    linearRampToValueAtTime(value: number, endTime: number): AudioParam;
-    setTargetAtTime(target: number, startTime: number, timeConstant: number): AudioParam;
-    setValueAtTime(value: number, startTime: number): AudioParam;
-    setValueCurveAtTime(values: number[], startTime: number, duration: number): AudioParam;
-}
-
-declare var AudioParam: {
-    prototype: AudioParam;
-    new(): AudioParam;
-};
-
-interface AudioProcessingEvent extends Event {
-    readonly inputBuffer: AudioBuffer;
-    readonly outputBuffer: AudioBuffer;
-    readonly playbackTime: number;
-}
-
-declare var AudioProcessingEvent: {
-    prototype: AudioProcessingEvent;
-    new(): AudioProcessingEvent;
-};
-
-interface AudioTrack {
-    enabled: boolean;
-    readonly id: string;
-    kind: string;
-    readonly label: string;
-    language: string;
-    readonly sourceBuffer: SourceBuffer;
-}
-
-declare var AudioTrack: {
-    prototype: AudioTrack;
-    new(): AudioTrack;
-};
-
-interface AudioTrackListEventMap {
-    "addtrack": TrackEvent;
-    "change": Event;
-    "removetrack": TrackEvent;
-}
-
-interface AudioTrackList extends EventTarget {
-    readonly length: number;
-    onaddtrack: ((this: AudioTrackList, ev: TrackEvent) => any) | null;
-    onchange: ((this: AudioTrackList, ev: Event) => any) | null;
-    onremovetrack: ((this: AudioTrackList, ev: TrackEvent) => any) | null;
-    getTrackById(id: string): AudioTrack | null;
-    item(index: number): AudioTrack;
-    addEventListener<K extends keyof AudioTrackListEventMap>(type: K, listener: (this: AudioTrackList, ev: AudioTrackListEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof AudioTrackListEventMap>(type: K, listener: (this: AudioTrackList, ev: AudioTrackListEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-    [index: number]: AudioTrack;
-}
-
-declare var AudioTrackList: {
-    prototype: AudioTrackList;
-    new(): AudioTrackList;
-};
-
-interface BarProp {
-    readonly visible: boolean;
-}
-
-declare var BarProp: {
-    prototype: BarProp;
-    new(): BarProp;
-};
-
-interface BeforeUnloadEvent extends Event {
-    returnValue: any;
-}
-
-declare var BeforeUnloadEvent: {
-    prototype: BeforeUnloadEvent;
-    new(): BeforeUnloadEvent;
-};
-
-interface BhxBrowser {
-    readonly lastError: DOMException;
-    checkMatchesGlobExpression(pattern: string, value: string): boolean;
-    checkMatchesUriExpression(pattern: string, value: string): boolean;
-    clearLastError(): void;
-    currentWindowId(): number;
-    fireExtensionApiTelemetry(functionName: string, isSucceeded: boolean, isSupported: boolean, errorString: string): void;
-    genericFunction(functionId: number, destination: any, parameters?: string, callbackId?: number): void;
-    genericSynchronousFunction(functionId: number, parameters?: string): string;
-    getExtensionId(): string;
-    getThisAddress(): any;
-    registerGenericFunctionCallbackHandler(callbackHandler: Function): void;
-    registerGenericListenerHandler(eventHandler: Function): void;
-    setLastError(parameters: string): void;
-    webPlatformGenericFunction(destination: any, parameters?: string, callbackId?: number): void;
-}
-
-declare var BhxBrowser: {
-    prototype: BhxBrowser;
-    new(): BhxBrowser;
-};
-
-interface BiquadFilterNode extends AudioNode {
-    readonly Q: AudioParam;
-    readonly detune: AudioParam;
-    readonly frequency: AudioParam;
-    readonly gain: AudioParam;
-    type: BiquadFilterType;
-    getFrequencyResponse(frequencyHz: Float32Array, magResponse: Float32Array, phaseResponse: Float32Array): void;
-}
-
-declare var BiquadFilterNode: {
-    prototype: BiquadFilterNode;
-    new(): BiquadFilterNode;
-};
-
-interface Blob {
-    readonly size: number;
-    readonly type: string;
-    msClose(): void;
-    msDetachStream(): any;
-    slice(start?: number, end?: number, contentType?: string): Blob;
-}
-
-declare var Blob: {
-    prototype: Blob;
-    new (blobParts?: any[], options?: BlobPropertyBag): Blob;
-};
-
-interface BlobPropertyBag {
-    endings?: string;
-    type?: string;
-}
-
-interface Body {
-    readonly bodyUsed: boolean;
-    arrayBuffer(): Promise<ArrayBuffer>;
-    blob(): Promise<Blob>;
-    formData(): Promise<FormData>;
-    json(): Promise<any>;
-    text(): Promise<string>;
-}
-
-interface BroadcastChannel extends EventTarget {
-    readonly name: string;
-    onmessage: (ev: MessageEvent) => any;
-    onmessageerror: (ev: MessageEvent) => any;
-    addEventListener<K extends keyof BroadcastChannelEventMap>(type: K, listener: (this: BroadcastChannel, ev: BroadcastChannelEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    close(): void;
-    postMessage(message: any): void;
-    removeEventListener<K extends keyof BroadcastChannelEventMap>(type: K, listener: (this: BroadcastChannel, ev: BroadcastChannelEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var BroadcastChannel: {
-    prototype: BroadcastChannel;
-    new(name: string): BroadcastChannel;
-};
-
-interface BroadcastChannelEventMap {
-    message: MessageEvent;
-    messageerror: MessageEvent;
-}
-
-interface ByteLengthQueuingStrategy {
-    highWaterMark: number;
-    size(chunk?: any): number;
-}
-
-declare var ByteLengthQueuingStrategy: {
-    prototype: ByteLengthQueuingStrategy;
-    new(strategy: QueuingStrategy): ByteLengthQueuingStrategy;
-};
-
-interface CDATASection extends Text {
-}
-
-declare var CDATASection: {
-    prototype: CDATASection;
-    new(): CDATASection;
-};
-
-interface CSS {
-    escape(value: string): string;
-    supports(property: string, value?: string): boolean;
-}
-declare var CSS: CSS;
-
-interface CSSConditionRule extends CSSGroupingRule {
-    conditionText: string;
-}
-
-declare var CSSConditionRule: {
-    prototype: CSSConditionRule;
-    new(): CSSConditionRule;
-};
-
-interface CSSFontFaceRule extends CSSRule {
-    readonly style: CSSStyleDeclaration;
-}
-
-declare var CSSFontFaceRule: {
-    prototype: CSSFontFaceRule;
-    new(): CSSFontFaceRule;
-};
-
-interface CSSGroupingRule extends CSSRule {
-    readonly cssRules: CSSRuleList;
-    deleteRule(index: number): void;
-    insertRule(rule: string, index: number): number;
-}
-
-declare var CSSGroupingRule: {
-    prototype: CSSGroupingRule;
-    new(): CSSGroupingRule;
-};
-
-interface CSSImportRule extends CSSRule {
-    readonly href: string;
-    readonly media: MediaList;
-    readonly styleSheet: CSSStyleSheet;
-}
-
-declare var CSSImportRule: {
-    prototype: CSSImportRule;
-    new(): CSSImportRule;
-};
-
-interface CSSKeyframeRule extends CSSRule {
-    keyText: string;
-    readonly style: CSSStyleDeclaration;
-}
-
-declare var CSSKeyframeRule: {
-    prototype: CSSKeyframeRule;
-    new(): CSSKeyframeRule;
-};
-
-interface CSSKeyframesRule extends CSSRule {
-    readonly cssRules: CSSRuleList;
-    name: string;
-    appendRule(rule: string): void;
-    deleteRule(rule: string): void;
-    findRule(rule: string): CSSKeyframeRule | null;
-}
-
-declare var CSSKeyframesRule: {
-    prototype: CSSKeyframesRule;
-    new(): CSSKeyframesRule;
-};
-
-interface CSSMediaRule extends CSSConditionRule {
-    readonly media: MediaList;
-}
-
-declare var CSSMediaRule: {
-    prototype: CSSMediaRule;
-    new(): CSSMediaRule;
-};
-
-interface CSSNamespaceRule extends CSSRule {
-    readonly namespaceURI: string;
-    readonly prefix: string;
-}
-
-declare var CSSNamespaceRule: {
-    prototype: CSSNamespaceRule;
-    new(): CSSNamespaceRule;
-};
-
-interface CSSPageRule extends CSSRule {
-    readonly pseudoClass: string;
-    readonly selector: string;
-    selectorText: string;
-    readonly style: CSSStyleDeclaration;
-}
-
-declare var CSSPageRule: {
-    prototype: CSSPageRule;
-    new(): CSSPageRule;
-};
-
-interface CSSRule {
-    cssText: string;
-    readonly parentRule: CSSRule | null;
-    readonly parentStyleSheet: CSSStyleSheet | null;
-    readonly type: number;
-    readonly CHARSET_RULE: number;
-    readonly FONT_FACE_RULE: number;
-    readonly IMPORT_RULE: number;
-    readonly KEYFRAMES_RULE: number;
-    readonly KEYFRAME_RULE: number;
-    readonly MEDIA_RULE: number;
-    readonly NAMESPACE_RULE: number;
-    readonly PAGE_RULE: number;
-    readonly STYLE_RULE: number;
-    readonly SUPPORTS_RULE: number;
-    readonly UNKNOWN_RULE: number;
-    readonly VIEWPORT_RULE: number;
-}
-
-declare var CSSRule: {
-    prototype: CSSRule;
-    new(): CSSRule;
-    readonly CHARSET_RULE: number;
-    readonly FONT_FACE_RULE: number;
-    readonly IMPORT_RULE: number;
-    readonly KEYFRAMES_RULE: number;
-    readonly KEYFRAME_RULE: number;
-    readonly MEDIA_RULE: number;
-    readonly NAMESPACE_RULE: number;
-    readonly PAGE_RULE: number;
-    readonly STYLE_RULE: number;
-    readonly SUPPORTS_RULE: number;
-    readonly UNKNOWN_RULE: number;
-    readonly VIEWPORT_RULE: number;
-};
-
-interface CSSRuleList {
-    readonly length: number;
-    item(index: number): CSSRule | null;
-    [index: number]: CSSRule;
-}
-
-declare var CSSRuleList: {
-    prototype: CSSRuleList;
-    new(): CSSRuleList;
-};
-
-interface CSSStyleDeclaration {
-    alignContent: string | null;
-    alignItems: string | null;
-    alignSelf: string | null;
-    alignmentBaseline: string | null;
-    animation: string | null;
-    animationDelay: string | null;
-    animationDirection: string | null;
-    animationDuration: string | null;
-    animationFillMode: string | null;
-    animationIterationCount: string | null;
-    animationName: string | null;
-    animationPlayState: string | null;
-    animationTimingFunction: string | null;
-    backfaceVisibility: string | null;
-    background: string | null;
-    backgroundAttachment: string | null;
-    backgroundClip: string | null;
-    backgroundColor: string | null;
-    backgroundImage: string | null;
-    backgroundOrigin: string | null;
-    backgroundPosition: string | null;
-    backgroundPositionX: string | null;
-    backgroundPositionY: string | null;
-    backgroundRepeat: string | null;
-    backgroundSize: string | null;
-    baselineShift: string | null;
-    border: string | null;
-    borderBottom: string | null;
-    borderBottomColor: string | null;
-    borderBottomLeftRadius: string | null;
-    borderBottomRightRadius: string | null;
-    borderBottomStyle: string | null;
-    borderBottomWidth: string | null;
-    borderCollapse: string | null;
-    borderColor: string | null;
-    borderImage: string | null;
-    borderImageOutset: string | null;
-    borderImageRepeat: string | null;
-    borderImageSlice: string | null;
-    borderImageSource: string | null;
-    borderImageWidth: string | null;
-    borderLeft: string | null;
-    borderLeftColor: string | null;
-    borderLeftStyle: string | null;
-    borderLeftWidth: string | null;
-    borderRadius: string | null;
-    borderRight: string | null;
-    borderRightColor: string | null;
-    borderRightStyle: string | null;
-    borderRightWidth: string | null;
-    borderSpacing: string | null;
-    borderStyle: string | null;
-    borderTop: string | null;
-    borderTopColor: string | null;
-    borderTopLeftRadius: string | null;
-    borderTopRightRadius: string | null;
-    borderTopStyle: string | null;
-    borderTopWidth: string | null;
-    borderWidth: string | null;
-    bottom: string | null;
-    boxShadow: string | null;
-    boxSizing: string | null;
-    breakAfter: string | null;
-    breakBefore: string | null;
-    breakInside: string | null;
-    captionSide: string | null;
-    clear: string | null;
-    clip: string | null;
-    clipPath: string | null;
-    clipRule: string | null;
-    color: string | null;
-    colorInterpolationFilters: string | null;
-    columnCount: any;
-    columnFill: string | null;
-    columnGap: any;
-    columnRule: string | null;
-    columnRuleColor: any;
-    columnRuleStyle: string | null;
-    columnRuleWidth: any;
-    columnSpan: string | null;
-    columnWidth: any;
-    columns: string | null;
-    content: string | null;
-    counterIncrement: string | null;
-    counterReset: string | null;
-    cssFloat: string | null;
-    cssText: string;
-    cursor: string | null;
-    direction: string | null;
-    display: string | null;
-    dominantBaseline: string | null;
-    emptyCells: string | null;
-    enableBackground: string | null;
-    fill: string | null;
-    fillOpacity: string | null;
-    fillRule: string | null;
-    filter: string | null;
-    flex: string | null;
-    flexBasis: string | null;
-    flexDirection: string | null;
-    flexFlow: string | null;
-    flexGrow: string | null;
-    flexShrink: string | null;
-    flexWrap: string | null;
-    floodColor: string | null;
-    floodOpacity: string | null;
-    font: string | null;
-    fontFamily: string | null;
-    fontFeatureSettings: string | null;
-    fontSize: string | null;
-    fontSizeAdjust: string | null;
-    fontStretch: string | null;
-    fontStyle: string | null;
-    fontVariant: string | null;
-    fontWeight: string | null;
-    gap: string | null;
-    glyphOrientationHorizontal: string | null;
-    glyphOrientationVertical: string | null;
-    grid: string | null;
-    gridArea: string | null;
-    gridAutoColumns: string | null;
-    gridAutoFlow: string | null;
-    gridAutoRows: string | null;
-    gridColumn: string | null;
-    gridColumnEnd: string | null;
-    gridColumnGap: string | null;
-    gridColumnStart: string | null;
-    gridGap: string | null;
-    gridRow: string | null;
-    gridRowEnd: string | null;
-    gridRowGap: string | null;
-    gridRowStart: string | null;
-    gridTemplate: string | null;
-    gridTemplateAreas: string | null;
-    gridTemplateColumns: string | null;
-    gridTemplateRows: string | null;
-    height: string | null;
-    imeMode: string | null;
-    justifyContent: string | null;
-    justifyItems: string | null;
-    justifySelf: string | null;
-    kerning: string | null;
-    layoutGrid: string | null;
-    layoutGridChar: string | null;
-    layoutGridLine: string | null;
-    layoutGridMode: string | null;
-    layoutGridType: string | null;
-    left: string | null;
-    readonly length: number;
-    letterSpacing: string | null;
-    lightingColor: string | null;
-    lineBreak: string | null;
-    lineHeight: string | null;
-    listStyle: string | null;
-    listStyleImage: string | null;
-    listStylePosition: string | null;
-    listStyleType: string | null;
-    margin: string | null;
-    marginBottom: string | null;
-    marginLeft: string | null;
-    marginRight: string | null;
-    marginTop: string | null;
-    marker: string | null;
-    markerEnd: string | null;
-    markerMid: string | null;
-    markerStart: string | null;
-    mask: string | null;
-    maskImage: string | null;
-    maxHeight: string | null;
-    maxWidth: string | null;
-    minHeight: string | null;
-    minWidth: string | null;
-    msContentZoomChaining: string | null;
-    msContentZoomLimit: string | null;
-    msContentZoomLimitMax: any;
-    msContentZoomLimitMin: any;
-    msContentZoomSnap: string | null;
-    msContentZoomSnapPoints: string | null;
-    msContentZoomSnapType: string | null;
-    msContentZooming: string | null;
-    msFlowFrom: string | null;
-    msFlowInto: string | null;
-    msFontFeatureSettings: string | null;
-    msGridColumn: any;
-    msGridColumnAlign: string | null;
-    msGridColumnSpan: any;
-    msGridColumns: string | null;
-    msGridRow: any;
-    msGridRowAlign: string | null;
-    msGridRowSpan: any;
-    msGridRows: string | null;
-    msHighContrastAdjust: string | null;
-    msHyphenateLimitChars: string | null;
-    msHyphenateLimitLines: any;
-    msHyphenateLimitZone: any;
-    msHyphens: string | null;
-    msImeAlign: string | null;
-    msOverflowStyle: string | null;
-    msScrollChaining: string | null;
-    msScrollLimit: string | null;
-    msScrollLimitXMax: any;
-    msScrollLimitXMin: any;
-    msScrollLimitYMax: any;
-    msScrollLimitYMin: any;
-    msScrollRails: string | null;
-    msScrollSnapPointsX: string | null;
-    msScrollSnapPointsY: string | null;
-    msScrollSnapType: string | null;
-    msScrollSnapX: string | null;
-    msScrollSnapY: string | null;
-    msScrollTranslation: string | null;
-    msTextCombineHorizontal: string | null;
-    msTextSizeAdjust: any;
-    msTouchAction: string | null;
-    msTouchSelect: string | null;
-    msUserSelect: string | null;
-    msWrapFlow: string;
-    msWrapMargin: any;
-    msWrapThrough: string;
-    objectFit: string | null;
-    objectPosition: string | null;
-    opacity: string | null;
-    order: string | null;
-    orphans: string | null;
-    outline: string | null;
-    outlineColor: string | null;
-    outlineOffset: string | null;
-    outlineStyle: string | null;
-    outlineWidth: string | null;
-    overflow: string | null;
-    overflowX: string | null;
-    overflowY: string | null;
-    padding: string | null;
-    paddingBottom: string | null;
-    paddingLeft: string | null;
-    paddingRight: string | null;
-    paddingTop: string | null;
-    pageBreakAfter: string | null;
-    pageBreakBefore: string | null;
-    pageBreakInside: string | null;
-    readonly parentRule: CSSRule;
-    penAction: string | null;
-    perspective: string | null;
-    perspectiveOrigin: string | null;
-    pointerEvents: string | null;
-    position: string | null;
-    quotes: string | null;
-    resize: string | null;
-    right: string | null;
-    rotate: string | null;
-    rowGap: string | null;
-    rubyAlign: string | null;
-    rubyOverhang: string | null;
-    rubyPosition: string | null;
-    scale: string | null;
-    stopColor: string | null;
-    stopOpacity: string | null;
-    stroke: string | null;
-    strokeDasharray: string | null;
-    strokeDashoffset: string | null;
-    strokeLinecap: string | null;
-    strokeLinejoin: string | null;
-    strokeMiterlimit: string | null;
-    strokeOpacity: string | null;
-    strokeWidth: string | null;
-    tableLayout: string | null;
-    textAlign: string | null;
-    textAlignLast: string | null;
-    textAnchor: string | null;
-    textCombineUpright: string | null;
-    textDecoration: string | null;
-    textIndent: string | null;
-    textJustify: string | null;
-    textKashida: string | null;
-    textKashidaSpace: string | null;
-    textOverflow: string | null;
-    textShadow: string | null;
-    textTransform: string | null;
-    textUnderlinePosition: string | null;
-    top: string | null;
-    touchAction: string | null;
-    transform: string | null;
-    transformOrigin: string | null;
-    transformStyle: string | null;
-    transition: string | null;
-    transitionDelay: string | null;
-    transitionDuration: string | null;
-    transitionProperty: string | null;
-    transitionTimingFunction: string | null;
-    translate: string | null;
-    unicodeBidi: string | null;
-    userSelect: string | null;
-    verticalAlign: string | null;
-    visibility: string | null;
-    webkitAlignContent: string | null;
-    webkitAlignItems: string | null;
-    webkitAlignSelf: string | null;
-    webkitAnimation: string | null;
-    webkitAnimationDelay: string | null;
-    webkitAnimationDirection: string | null;
-    webkitAnimationDuration: string | null;
-    webkitAnimationFillMode: string | null;
-    webkitAnimationIterationCount: string | null;
-    webkitAnimationName: string | null;
-    webkitAnimationPlayState: string | null;
-    webkitAnimationTimingFunction: string | null;
-    webkitAppearance: string | null;
-    webkitBackfaceVisibility: string | null;
-    webkitBackgroundClip: string | null;
-    webkitBackgroundOrigin: string | null;
-    webkitBackgroundSize: string | null;
-    webkitBorderBottomLeftRadius: string | null;
-    webkitBorderBottomRightRadius: string | null;
-    webkitBorderImage: string | null;
-    webkitBorderRadius: string | null;
-    webkitBorderTopLeftRadius: string | null;
-    webkitBorderTopRightRadius: string | null;
-    webkitBoxAlign: string | null;
-    webkitBoxDirection: string | null;
-    webkitBoxFlex: string | null;
-    webkitBoxOrdinalGroup: string | null;
-    webkitBoxOrient: string | null;
-    webkitBoxPack: string | null;
-    webkitBoxSizing: string | null;
-    webkitColumnBreakAfter: string | null;
-    webkitColumnBreakBefore: string | null;
-    webkitColumnBreakInside: string | null;
-    webkitColumnCount: any;
-    webkitColumnGap: any;
-    webkitColumnRule: string | null;
-    webkitColumnRuleColor: any;
-    webkitColumnRuleStyle: string | null;
-    webkitColumnRuleWidth: any;
-    webkitColumnSpan: string | null;
-    webkitColumnWidth: any;
-    webkitColumns: string | null;
-    webkitFilter: string | null;
-    webkitFlex: string | null;
-    webkitFlexBasis: string | null;
-    webkitFlexDirection: string | null;
-    webkitFlexFlow: string | null;
-    webkitFlexGrow: string | null;
-    webkitFlexShrink: string | null;
-    webkitFlexWrap: string | null;
-    webkitJustifyContent: string | null;
-    webkitOrder: string | null;
-    webkitPerspective: string | null;
-    webkitPerspectiveOrigin: string | null;
-    webkitTapHighlightColor: string | null;
-    webkitTextFillColor: string | null;
-    webkitTextSizeAdjust: any;
-    webkitTextStroke: string | null;
-    webkitTextStrokeColor: string | null;
-    webkitTextStrokeWidth: string | null;
-    webkitTransform: string | null;
-    webkitTransformOrigin: string | null;
-    webkitTransformStyle: string | null;
-    webkitTransition: string | null;
-    webkitTransitionDelay: string | null;
-    webkitTransitionDuration: string | null;
-    webkitTransitionProperty: string | null;
-    webkitTransitionTimingFunction: string | null;
-    webkitUserModify: string | null;
-    webkitUserSelect: string | null;
-    webkitWritingMode: string | null;
-    whiteSpace: string | null;
-    widows: string | null;
-    width: string | null;
-    wordBreak: string | null;
-    wordSpacing: string | null;
-    wordWrap: string | null;
-    writingMode: string | null;
-    zIndex: string | null;
-    zoom: string | null;
-    getPropertyPriority(propertyName: string): string;
-    getPropertyValue(propertyName: string): string;
-    item(index: number): string;
-    removeProperty(propertyName: string): string;
-    setProperty(propertyName: string, value: string | null, priority?: string | null): void;
-    [index: number]: string;
-}
-
-declare var CSSStyleDeclaration: {
-    prototype: CSSStyleDeclaration;
-    new(): CSSStyleDeclaration;
-};
-
-interface CSSStyleRule extends CSSRule {
-    selectorText: string;
-    readonly style: CSSStyleDeclaration;
-}
-
-declare var CSSStyleRule: {
-    prototype: CSSStyleRule;
-    new(): CSSStyleRule;
-};
-
-interface CSSStyleSheet extends StyleSheet {
-    readonly cssRules: CSSRuleList;
-    /** @deprecated */
-    cssText: string;
-    /** @deprecated */
-    readonly id: string;
-    /** @deprecated */
-    readonly imports: StyleSheetList;
-    /** @deprecated */
-    readonly isAlternate: boolean;
-    /** @deprecated */
-    readonly isPrefAlternate: boolean;
-    readonly ownerRule: CSSRule | null;
-    /** @deprecated */
-    readonly owningElement: Element;
-    /** @deprecated */
-    readonly pages: any;
-    /** @deprecated */
-    readonly readOnly: boolean;
-    readonly rules: CSSRuleList;
-    /** @deprecated */
-    addImport(bstrURL: string, lIndex?: number): number;
-    /** @deprecated */
-    addPageRule(bstrSelector: string, bstrStyle: string, lIndex?: number): number;
-    addRule(bstrSelector: string, bstrStyle?: string, lIndex?: number): number;
-    deleteRule(index?: number): void;
-    insertRule(rule: string, index?: number): number;
-    /** @deprecated */
-    removeImport(lIndex: number): void;
-    removeRule(lIndex: number): void;
-}
-
-declare var CSSStyleSheet: {
-    prototype: CSSStyleSheet;
-    new(): CSSStyleSheet;
-};
-
-interface CSSSupportsRule extends CSSConditionRule {
-}
-
-declare var CSSSupportsRule: {
-    prototype: CSSSupportsRule;
-    new(): CSSSupportsRule;
-};
-
-interface Cache {
-    add(request: Request | string): Promise<void>;
-    addAll(requests: (Request | string)[]): Promise<void>;
-    delete(request: Request | string, options?: CacheQueryOptions): Promise<boolean>;
-    keys(request?: Request | string, options?: CacheQueryOptions): Promise<Request[]>;
-    match(request: Request | string, options?: CacheQueryOptions): Promise<Response>;
-    matchAll(request?: Request | string, options?: CacheQueryOptions): Promise<Response[]>;
-    put(request: Request | string, response: Response): Promise<void>;
-}
-
-declare var Cache: {
-    prototype: Cache;
-    new(): Cache;
-};
-
-interface CacheStorage {
-    delete(cacheName: string): Promise<boolean>;
-    has(cacheName: string): Promise<boolean>;
-    keys(): Promise<string[]>;
-    match(request: Request | string, options?: CacheQueryOptions): Promise<any>;
-    open(cacheName: string): Promise<Cache>;
-}
-
-declare var CacheStorage: {
-    prototype: CacheStorage;
-    new(): CacheStorage;
-};
-
-interface Canvas2DContextAttributes {
-    alpha?: boolean;
-    storage?: boolean;
-    willReadFrequently?: boolean;
-    [attribute: string]: boolean | string | undefined;
-}
-
-interface CanvasGradient {
-    addColorStop(offset: number, color: string): void;
-}
-
-declare var CanvasGradient: {
-    prototype: CanvasGradient;
-    new(): CanvasGradient;
-};
-
-interface CanvasPathMethods {
-    arc(x: number, y: number, radius: number, startAngle: number, endAngle: number, anticlockwise?: boolean): void;
-    arcTo(x1: number, y1: number, x2: number, y2: number, radius: number): void;
-    arcTo(x1: number, y1: number, x2: number, y2: number, radiusX: number, radiusY: number, rotation: number): void;
-    bezierCurveTo(cp1x: number, cp1y: number, cp2x: number, cp2y: number, x: number, y: number): void;
-    closePath(): void;
-    ellipse(x: number, y: number, radiusX: number, radiusY: number, rotation: number, startAngle: number, endAngle: number, anticlockwise?: boolean): void;
-    lineTo(x: number, y: number): void;
-    moveTo(x: number, y: number): void;
-    quadraticCurveTo(cpx: number, cpy: number, x: number, y: number): void;
-    rect(x: number, y: number, w: number, h: number): void;
-}
-
-interface CanvasPattern {
-    setTransform(matrix: SVGMatrix): void;
-}
-
-declare var CanvasPattern: {
-    prototype: CanvasPattern;
-    new(): CanvasPattern;
-};
-
-interface CanvasRenderingContext2D extends CanvasPathMethods {
-    readonly canvas: HTMLCanvasElement;
-    fillStyle: string | CanvasGradient | CanvasPattern;
-    font: string;
-    globalAlpha: number;
-    globalCompositeOperation: string;
-    imageSmoothingEnabled: boolean;
-    lineCap: string;
-    lineDashOffset: number;
-    lineJoin: string;
-    lineWidth: number;
-    miterLimit: number;
-    mozImageSmoothingEnabled: boolean;
-    msFillRule: CanvasFillRule;
-    oImageSmoothingEnabled: boolean;
-    shadowBlur: number;
-    shadowColor: string;
-    shadowOffsetX: number;
-    shadowOffsetY: number;
-    strokeStyle: string | CanvasGradient | CanvasPattern;
-    textAlign: string;
-    textBaseline: string;
-    webkitImageSmoothingEnabled: boolean;
-    beginPath(): void;
-    clearRect(x: number, y: number, w: number, h: number): void;
-    clip(fillRule?: CanvasFillRule): void;
-    clip(path: Path2D, fillRule?: CanvasFillRule): void;
-    createImageData(imageDataOrSw: number | ImageData, sh?: number): ImageData;
-    createLinearGradient(x0: number, y0: number, x1: number, y1: number): CanvasGradient;
-    createPattern(image: HTMLImageElement | HTMLCanvasElement | HTMLVideoElement, repetition: string): CanvasPattern;
-    createRadialGradient(x0: number, y0: number, r0: number, x1: number, y1: number, r1: number): CanvasGradient;
-    drawFocusIfNeeded(element: Element): void;
-    drawFocusIfNeeded(path: Path2D, element: Element): void;
-    drawImage(image: HTMLImageElement | HTMLCanvasElement | HTMLVideoElement | ImageBitmap, dstX: number, dstY: number): void;
-    drawImage(image: HTMLImageElement | HTMLCanvasElement | HTMLVideoElement | ImageBitmap, dstX: number, dstY: number, dstW: number, dstH: number): void;
-    drawImage(image: HTMLImageElement | HTMLCanvasElement | HTMLVideoElement | ImageBitmap, srcX: number, srcY: number, srcW: number, srcH: number, dstX: number, dstY: number, dstW: number, dstH: number): void;
-    fill(fillRule?: CanvasFillRule): void;
-    fill(path: Path2D, fillRule?: CanvasFillRule): void;
-    fillRect(x: number, y: number, w: number, h: number): void;
-    fillText(text: string, x: number, y: number, maxWidth?: number): void;
-    getImageData(sx: number, sy: number, sw: number, sh: number): ImageData;
-    getLineDash(): number[];
-    isPointInPath(x: number, y: number, fillRule?: CanvasFillRule): boolean;
-    isPointInPath(path: Path2D, x: number, y: number, fillRule?: CanvasFillRule): boolean;
-    isPointInStroke(x: number, y: number, fillRule?: CanvasFillRule): boolean;
-    isPointInStroke(path: Path2D, x: number, y: number, fillRule?: CanvasFillRule): boolean;
-    measureText(text: string): TextMetrics;
-    putImageData(imagedata: ImageData, dx: number, dy: number, dirtyX?: number, dirtyY?: number, dirtyWidth?: number, dirtyHeight?: number): void;
-    restore(): void;
-    rotate(angle: number): void;
-    save(): void;
-    scale(x: number, y: number): void;
-    setLineDash(segments: number[]): void;
-    setTransform(m11: number, m12: number, m21: number, m22: number, dx: number, dy: number): void;
-    stroke(path?: Path2D): void;
-    strokeRect(x: number, y: number, w: number, h: number): void;
-    strokeText(text: string, x: number, y: number, maxWidth?: number): void;
-    transform(m11: number, m12: number, m21: number, m22: number, dx: number, dy: number): void;
-    translate(x: number, y: number): void;
-}
-
-declare var CanvasRenderingContext2D: {
-    prototype: CanvasRenderingContext2D;
-    new(): CanvasRenderingContext2D;
-};
-
-interface ChannelMergerNode extends AudioNode {
-}
-
-declare var ChannelMergerNode: {
-    prototype: ChannelMergerNode;
-    new(): ChannelMergerNode;
-};
-
-interface ChannelSplitterNode extends AudioNode {
-}
-
-declare var ChannelSplitterNode: {
-    prototype: ChannelSplitterNode;
-    new(): ChannelSplitterNode;
-};
-
-interface CharacterData extends Node, ChildNode {
-    data: string;
-    readonly length: number;
-    appendData(arg: string): void;
-    deleteData(offset: number, count: number): void;
-    insertData(offset: number, arg: string): void;
-    replaceData(offset: number, count: number, arg: string): void;
-    substringData(offset: number, count: number): string;
-}
-
-declare var CharacterData: {
-    prototype: CharacterData;
-    new(): CharacterData;
-};
-
-interface ChildNode {
-    remove(): void;
-}
-
-interface ClientRect {
-    bottom: number;
-    readonly height: number;
-    left: number;
-    right: number;
-    top: number;
-    readonly width: number;
-}
-
-declare var ClientRect: {
-    prototype: ClientRect;
-    new(): ClientRect;
-};
-
-interface ClientRectList {
-    readonly length: number;
-    item(index: number): ClientRect;
-    [index: number]: ClientRect;
-}
-
-declare var ClientRectList: {
-    prototype: ClientRectList;
-    new(): ClientRectList;
-};
-
-interface ClipboardEvent extends Event {
-    readonly clipboardData: DataTransfer;
-}
-
-declare var ClipboardEvent: {
-    prototype: ClipboardEvent;
-    new(type: string, eventInitDict?: ClipboardEventInit): ClipboardEvent;
-};
-
-interface ClipboardEventInit extends EventInit {
-    data?: string;
-    dataType?: string;
-}
-
-interface CloseEvent extends Event {
-    readonly code: number;
-    readonly reason: string;
-    readonly wasClean: boolean;
-    /** @deprecated */
-    initCloseEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, wasCleanArg: boolean, codeArg: number, reasonArg: string): void;
-}
-
-declare var CloseEvent: {
-    prototype: CloseEvent;
-    new(type: string, eventInitDict?: CloseEventInit): CloseEvent;
-};
-
-interface Comment extends CharacterData {
-    text: string;
-}
-
-declare var Comment: {
-    prototype: Comment;
-    new(data?: string): Comment;
-};
-
-interface CompositionEvent extends UIEvent {
-    readonly data: string;
-    readonly locale: string;
-    initCompositionEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, dataArg: string, locale: string): void;
-}
-
-declare var CompositionEvent: {
-    prototype: CompositionEvent;
-    new(typeArg: string, eventInitDict?: CompositionEventInit): CompositionEvent;
-};
-
-interface ComputedTimingProperties {
-    activeDuration: number;
-    currentIteration: number | null;
-    endTime: number;
-    localTime: number | null;
-    progress: number | null;
-}
-
-interface ConcatParams extends Algorithm {
-    algorithmId: Uint8Array;
-    hash?: string | Algorithm;
-    partyUInfo: Uint8Array;
-    partyVInfo: Uint8Array;
-    privateInfo?: Uint8Array;
-    publicInfo?: Uint8Array;
-}
-
-interface Console {
-    memory: any;
-    assert(condition?: boolean, message?: string, ...data: any[]): void;
-    clear(): void;
-    count(label?: string): void;
-    debug(message?: any, ...optionalParams: any[]): void;
-    dir(value?: any, ...optionalParams: any[]): void;
-    dirxml(value: any): void;
-    error(message?: any, ...optionalParams: any[]): void;
-    exception(message?: string, ...optionalParams: any[]): void;
-    group(groupTitle?: string, ...optionalParams: any[]): void;
-    groupCollapsed(groupTitle?: string, ...optionalParams: any[]): void;
-    groupEnd(): void;
-    info(message?: any, ...optionalParams: any[]): void;
-    log(message?: any, ...optionalParams: any[]): void;
-    markTimeline(label?: string): void;
-    msIsIndependentlyComposed(element: Element): boolean;
-    profile(reportName?: string): void;
-    profileEnd(): void;
-    select(element: Element): void;
-    table(...tabularData: any[]): void;
-    time(label?: string): void;
-    timeEnd(label?: string): void;
-    timeStamp(label?: string): void;
-    timeline(label?: string): void;
-    timelineEnd(label?: string): void;
-    trace(message?: any, ...optionalParams: any[]): void;
-    warn(message?: any, ...optionalParams: any[]): void;
-}
-
-declare var Console: {
-    prototype: Console;
-    new(): Console;
-};
-
-interface ContentScriptGlobalScope extends EventTarget {
-    readonly msContentScript: ExtensionScriptApis;
-    readonly window: Window;
-}
-
-declare var ContentScriptGlobalScope: {
-    prototype: ContentScriptGlobalScope;
-    new(): ContentScriptGlobalScope;
-};
-
-interface ConvolverNode extends AudioNode {
-    buffer: AudioBuffer | null;
-    normalize: boolean;
-}
-
-declare var ConvolverNode: {
-    prototype: ConvolverNode;
-    new(): ConvolverNode;
-};
-
-interface Coordinates {
-    readonly accuracy: number;
-    readonly altitude: number | null;
-    readonly altitudeAccuracy: number | null;
-    readonly heading: number | null;
-    readonly latitude: number;
-    readonly longitude: number;
-    readonly speed: number | null;
-}
-
-declare var Coordinates: {
-    prototype: Coordinates;
-    new(): Coordinates;
-};
-
-interface CountQueuingStrategy {
-    highWaterMark: number;
-    size(): number;
-}
-
-declare var CountQueuingStrategy: {
-    prototype: CountQueuingStrategy;
-    new(strategy: QueuingStrategy): CountQueuingStrategy;
-};
-
-interface Crypto {
-    readonly subtle: SubtleCrypto;
-    getRandomValues(array: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | null): Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | null;
-}
-
-declare var Crypto: {
-    prototype: Crypto;
-    new(): Crypto;
-};
-
-interface CryptoKey {
-    readonly algorithm: KeyAlgorithm;
-    readonly extractable: boolean;
-    readonly type: string;
-    readonly usages: string[];
-}
-
-declare var CryptoKey: {
-    prototype: CryptoKey;
-    new(): CryptoKey;
-};
-
-interface CryptoKeyPair {
-    privateKey: CryptoKey;
-    publicKey: CryptoKey;
-}
-
-declare var CryptoKeyPair: {
-    prototype: CryptoKeyPair;
-    new(): CryptoKeyPair;
-};
-
-interface CustomElementRegistry {
-    define(name: string, constructor: Function, options?: ElementDefinitionOptions): void;
-    get(name: string): any;
-    whenDefined(name: string): PromiseLike<void>;
-}
-
-interface CustomEvent<T = any> extends Event {
-    readonly detail: T;
-    initCustomEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, detailArg: T): void;
-}
-
-declare var CustomEvent: {
-    prototype: CustomEvent;
-    new<T>(typeArg: string, eventInitDict?: CustomEventInit<T>): CustomEvent<T>;
-};
-
-interface DOMError {
-    readonly name: string;
-    toString(): string;
-}
-
-declare var DOMError: {
-    prototype: DOMError;
-    new(): DOMError;
-};
-
-interface DOMException {
-    readonly code: number;
-    readonly message: string;
-    readonly name: string;
-    toString(): string;
-    readonly ABORT_ERR: number;
-    readonly DATA_CLONE_ERR: number;
-    readonly DOMSTRING_SIZE_ERR: number;
-    readonly HIERARCHY_REQUEST_ERR: number;
-    readonly INDEX_SIZE_ERR: number;
-    readonly INUSE_ATTRIBUTE_ERR: number;
-    readonly INVALID_ACCESS_ERR: number;
-    readonly INVALID_CHARACTER_ERR: number;
-    readonly INVALID_MODIFICATION_ERR: number;
-    readonly INVALID_NODE_TYPE_ERR: number;
-    readonly INVALID_STATE_ERR: number;
-    readonly NAMESPACE_ERR: number;
-    readonly NETWORK_ERR: number;
-    readonly NOT_FOUND_ERR: number;
-    readonly NOT_SUPPORTED_ERR: number;
-    readonly NO_DATA_ALLOWED_ERR: number;
-    readonly NO_MODIFICATION_ALLOWED_ERR: number;
-    readonly PARSE_ERR: number;
-    readonly QUOTA_EXCEEDED_ERR: number;
-    readonly SECURITY_ERR: number;
-    readonly SERIALIZE_ERR: number;
-    readonly SYNTAX_ERR: number;
-    readonly TIMEOUT_ERR: number;
-    readonly TYPE_MISMATCH_ERR: number;
-    readonly URL_MISMATCH_ERR: number;
-    readonly VALIDATION_ERR: number;
-    readonly WRONG_DOCUMENT_ERR: number;
-}
-
-declare var DOMException: {
-    prototype: DOMException;
-    new(message?: string, name?: string): DOMException;
-    readonly ABORT_ERR: number;
-    readonly DATA_CLONE_ERR: number;
-    readonly DOMSTRING_SIZE_ERR: number;
-    readonly HIERARCHY_REQUEST_ERR: number;
-    readonly INDEX_SIZE_ERR: number;
-    readonly INUSE_ATTRIBUTE_ERR: number;
-    readonly INVALID_ACCESS_ERR: number;
-    readonly INVALID_CHARACTER_ERR: number;
-    readonly INVALID_MODIFICATION_ERR: number;
-    readonly INVALID_NODE_TYPE_ERR: number;
-    readonly INVALID_STATE_ERR: number;
-    readonly NAMESPACE_ERR: number;
-    readonly NETWORK_ERR: number;
-    readonly NOT_FOUND_ERR: number;
-    readonly NOT_SUPPORTED_ERR: number;
-    readonly NO_DATA_ALLOWED_ERR: number;
-    readonly NO_MODIFICATION_ALLOWED_ERR: number;
-    readonly PARSE_ERR: number;
-    readonly QUOTA_EXCEEDED_ERR: number;
-    readonly SECURITY_ERR: number;
-    readonly SERIALIZE_ERR: number;
-    readonly SYNTAX_ERR: number;
-    readonly TIMEOUT_ERR: number;
-    readonly TYPE_MISMATCH_ERR: number;
-    readonly URL_MISMATCH_ERR: number;
-    readonly VALIDATION_ERR: number;
-    readonly WRONG_DOCUMENT_ERR: number;
-};
-
-interface DOMImplementation {
-    createDocument(namespaceURI: string | null, qualifiedName: string | null, doctype: DocumentType | null): Document;
-    createDocumentType(qualifiedName: string, publicId: string, systemId: string): DocumentType;
-    createHTMLDocument(title?: string): Document;
-    hasFeature(feature: string | null, version: string | null): boolean;
-}
-
-declare var DOMImplementation: {
-    prototype: DOMImplementation;
-    new(): DOMImplementation;
-};
-
-interface DOML2DeprecatedColorProperty {
-    color: string;
-}
-
-interface DOML2DeprecatedSizeProperty {
-    size: number;
-}
-
-interface DOMParser {
-    parseFromString(source: string, mimeType: string): Document;
-}
-
-declare var DOMParser: {
-    prototype: DOMParser;
-    new(): DOMParser;
-};
-
-interface DOMRect extends DOMRectReadOnly {
-    height: number;
-    width: number;
-    x: number;
-    y: number;
-}
-
-declare var DOMRect: {
-    prototype: DOMRect;
-    new (x?: number, y?: number, width?: number, height?: number): DOMRect;
-    fromRect(rectangle?: DOMRectInit): DOMRect;
-};
-
-interface DOMRectList {
-    readonly length: number;
-    item(index: number): DOMRect | null;
-    [index: number]: DOMRect;
-}
-
-interface DOMRectReadOnly {
-    readonly bottom: number;
-    readonly height: number;
-    readonly left: number;
-    readonly right: number;
-    readonly top: number;
-    readonly width: number;
-    readonly x: number;
-    readonly y: number;
-}
-
-declare var DOMRectReadOnly: {
-    prototype: DOMRectReadOnly;
-    new (x?: number, y?: number, width?: number, height?: number): DOMRectReadOnly;
-    fromRect(rectangle?: DOMRectInit): DOMRectReadOnly;
-};
-
-interface DOMSettableTokenList extends DOMTokenList {
-    value: string;
-}
-
-declare var DOMSettableTokenList: {
-    prototype: DOMSettableTokenList;
-    new(): DOMSettableTokenList;
-};
-
-interface DOMStringList {
-    readonly length: number;
-    contains(str: string): boolean;
-    item(index: number): string | null;
-    [index: number]: string;
-}
-
-declare var DOMStringList: {
-    prototype: DOMStringList;
-    new(): DOMStringList;
-};
-
-interface DOMStringMap {
-    [name: string]: string | undefined;
-}
-
-declare var DOMStringMap: {
-    prototype: DOMStringMap;
-    new(): DOMStringMap;
-};
-
-interface DOMTokenList {
-    readonly length: number;
-    add(...tokens: string[]): void;
-    contains(token: string): boolean;
-    item(index: number): string | null;
-    remove(...tokens: string[]): void;
-    replace(oldToken: string, newToken: string): void;
-    toString(): string;
-    toggle(token: string, force?: boolean): boolean;
-    [index: number]: string;
-}
-
-declare var DOMTokenList: {
-    prototype: DOMTokenList;
-    new(): DOMTokenList;
-};
-
-interface DataCue extends TextTrackCue {
-    data: ArrayBuffer;
-    addEventListener<K extends keyof TextTrackCueEventMap>(type: K, listener: (this: DataCue, ev: TextTrackCueEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof TextTrackCueEventMap>(type: K, listener: (this: DataCue, ev: TextTrackCueEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var DataCue: {
-    prototype: DataCue;
-    new(): DataCue;
-};
-
-interface DataTransfer {
-    dropEffect: string;
-    effectAllowed: string;
-    readonly files: FileList;
-    readonly items: DataTransferItemList;
-    readonly types: string[];
-    clearData(format?: string): boolean;
-    getData(format: string): string;
-    setData(format: string, data: string): boolean;
-    setDragImage(image: Element, x: number, y: number): void;
-}
-
-declare var DataTransfer: {
-    prototype: DataTransfer;
-    new(): DataTransfer;
-};
-
-interface DataTransferItem {
-    readonly kind: string;
-    readonly type: string;
-    getAsFile(): File | null;
-    getAsString(_callback: FunctionStringCallback | null): void;
-    webkitGetAsEntry(): any;
-}
-
-declare var DataTransferItem: {
-    prototype: DataTransferItem;
-    new(): DataTransferItem;
-};
-
-interface DataTransferItemList {
-    readonly length: number;
-    add(data: File): DataTransferItem | null;
-    add(data: string, type: string): DataTransferItem | null;
-    clear(): void;
-    item(index: number): DataTransferItem;
-    remove(index: number): void;
-    [name: number]: DataTransferItem;
-}
-
-declare var DataTransferItemList: {
-    prototype: DataTransferItemList;
-    new(): DataTransferItemList;
-};
-
-interface DeferredPermissionRequest {
-    readonly id: number;
-    readonly type: MSWebViewPermissionType;
-    readonly uri: string;
-    allow(): void;
-    deny(): void;
-}
-
-declare var DeferredPermissionRequest: {
-    prototype: DeferredPermissionRequest;
-    new(): DeferredPermissionRequest;
-};
-
-interface DelayNode extends AudioNode {
-    readonly delayTime: AudioParam;
-}
-
-declare var DelayNode: {
-    prototype: DelayNode;
-    new(): DelayNode;
-};
-
-interface DeviceAcceleration {
-    readonly x: number | null;
-    readonly y: number | null;
-    readonly z: number | null;
-}
-
-declare var DeviceAcceleration: {
-    prototype: DeviceAcceleration;
-    new(): DeviceAcceleration;
-};
-
-interface DeviceLightEvent extends Event {
-    readonly value: number;
-}
-
-declare var DeviceLightEvent: {
-    prototype: DeviceLightEvent;
-    new(typeArg: string, eventInitDict?: DeviceLightEventInit): DeviceLightEvent;
-};
-
-interface DeviceMotionEvent extends Event {
-    readonly acceleration: DeviceAcceleration | null;
-    readonly accelerationIncludingGravity: DeviceAcceleration | null;
-    readonly interval: number | null;
-    readonly rotationRate: DeviceRotationRate | null;
-    initDeviceMotionEvent(type: string, bubbles: boolean, cancelable: boolean, acceleration: DeviceAccelerationDict | null, accelerationIncludingGravity: DeviceAccelerationDict | null, rotationRate: DeviceRotationRateDict | null, interval: number | null): void;
-}
-
-declare var DeviceMotionEvent: {
-    prototype: DeviceMotionEvent;
-    new(typeArg: string, eventInitDict?: DeviceMotionEventInit): DeviceMotionEvent;
-};
-
-interface DeviceOrientationEvent extends Event {
-    readonly absolute: boolean;
-    readonly alpha: number | null;
-    readonly beta: number | null;
-    readonly gamma: number | null;
-    initDeviceOrientationEvent(type: string, bubbles: boolean, cancelable: boolean, alpha: number | null, beta: number | null, gamma: number | null, absolute: boolean): void;
-}
-
-declare var DeviceOrientationEvent: {
-    prototype: DeviceOrientationEvent;
-    new(typeArg: string, eventInitDict?: DeviceOrientationEventInit): DeviceOrientationEvent;
-};
-
-interface DeviceRotationRate {
-    readonly alpha: number | null;
-    readonly beta: number | null;
-    readonly gamma: number | null;
-}
-
-declare var DeviceRotationRate: {
-    prototype: DeviceRotationRate;
-    new(): DeviceRotationRate;
-};
-
-interface DhImportKeyParams extends Algorithm {
-    generator: Uint8Array;
-    prime: Uint8Array;
-}
-
-interface DhKeyAlgorithm extends KeyAlgorithm {
-    generator: Uint8Array;
-    prime: Uint8Array;
-}
-
-interface DhKeyDeriveParams extends Algorithm {
-    public: CryptoKey;
-}
-
-interface DhKeyGenParams extends Algorithm {
-    generator: Uint8Array;
-    prime: Uint8Array;
-}
-
-interface DocumentEventMap extends GlobalEventHandlersEventMap {
-    "abort": UIEvent;
-    "activate": Event;
-    "beforeactivate": Event;
-    "beforedeactivate": Event;
-    "blur": FocusEvent;
-    "canplay": Event;
-    "canplaythrough": Event;
-    "change": Event;
-    "click": MouseEvent;
-    "contextmenu": PointerEvent;
-    "dblclick": MouseEvent;
-    "deactivate": Event;
-    "drag": DragEvent;
-    "dragend": DragEvent;
-    "dragenter": DragEvent;
-    "dragleave": DragEvent;
-    "dragover": DragEvent;
-    "dragstart": DragEvent;
-    "drop": DragEvent;
-    "durationchange": Event;
-    "emptied": Event;
-    "ended": Event;
-    "error": ErrorEvent;
-    "focus": FocusEvent;
-    "fullscreenchange": Event;
-    "fullscreenerror": Event;
-    "input": Event;
-    "invalid": Event;
-    "keydown": KeyboardEvent;
-    "keypress": KeyboardEvent;
-    "keyup": KeyboardEvent;
-    "load": Event;
-    "loadeddata": Event;
-    "loadedmetadata": Event;
-    "loadstart": Event;
-    "mousedown": MouseEvent;
-    "mousemove": MouseEvent;
-    "mouseout": MouseEvent;
-    "mouseover": MouseEvent;
-    "mouseup": MouseEvent;
-    "mousewheel": WheelEvent;
-    "MSContentZoom": Event;
-    "MSGestureChange": Event;
-    "MSGestureDoubleTap": Event;
-    "MSGestureEnd": Event;
-    "MSGestureHold": Event;
-    "MSGestureStart": Event;
-    "MSGestureTap": Event;
-    "MSInertiaStart": Event;
-    "MSManipulationStateChanged": Event;
-    "MSPointerCancel": Event;
-    "MSPointerDown": Event;
-    "MSPointerEnter": Event;
-    "MSPointerLeave": Event;
-    "MSPointerMove": Event;
-    "MSPointerOut": Event;
-    "MSPointerOver": Event;
-    "MSPointerUp": Event;
-    "mssitemodejumplistitemremoved": Event;
-    "msthumbnailclick": Event;
-    "pause": Event;
-    "play": Event;
-    "playing": Event;
-    "pointerlockchange": Event;
-    "pointerlockerror": Event;
-    "progress": ProgressEvent;
-    "ratechange": Event;
-    "readystatechange": Event;
-    "reset": Event;
-    "scroll": UIEvent;
-    "seeked": Event;
-    "seeking": Event;
-    "select": UIEvent;
-    "selectionchange": Event;
-    "selectstart": Event;
-    "stalled": Event;
-    "stop": Event;
-    "submit": Event;
-    "suspend": Event;
-    "timeupdate": Event;
-    "touchcancel": TouchEvent;
-    "touchend": TouchEvent;
-    "touchmove": TouchEvent;
-    "touchstart": TouchEvent;
-    "volumechange": Event;
-    "waiting": Event;
-    "webkitfullscreenchange": Event;
-    "webkitfullscreenerror": Event;
-}
-
-interface Document extends Node, GlobalEventHandlers, ParentNode, DocumentEvent {
-    /**
-     * Sets or gets the URL for the current document.
-     */
-    readonly URL: string;
-    /**
-     * Gets the URL for the document, stripped of any character encoding.
-     */
-    readonly URLUnencoded: string;
-    /**
-     * Gets the object that has the focus when the parent document has focus.
-     */
-    readonly activeElement: Element;
-    /**
-     * Sets or gets the color of all active links in the document.
-     */
-    alinkColor: string;
-    /**
-     * Returns a reference to the collection of elements contained by the object.
-     */
-    readonly all: HTMLAllCollection;
-    /**
-     * Retrieves a collection of all a objects that have a name and/or id property. Objects in this collection are in HTML source order.
-     */
-    readonly anchors: HTMLCollectionOf<HTMLAnchorElement>;
-    /**
-     * Retrieves a collection of all applet objects in the document.
-     */
-    readonly applets: HTMLCollectionOf<HTMLAppletElement>;
-    /**
-     * Deprecated. Sets or retrieves a value that indicates the background color behind the object.
-     */
-    bgColor: string;
-    /**
-     * Specifies the beginning and end of the document body.
-     */
-    body: HTMLElement;
-    readonly characterSet: string;
-    /**
-     * Gets or sets the character set used to encode the object.
-     */
-    charset: string;
-    /**
-     * Gets a value that indicates whether standards-compliant mode is switched on for the object.
-     */
-    readonly compatMode: string;
-    cookie: string;
-    readonly currentScript: HTMLScriptElement | SVGScriptElement | null;
-    readonly defaultView: Window;
-    /**
-     * Sets or gets a value that indicates whether the document can be edited.
-     */
-    designMode: string;
-    /**
-     * Sets or retrieves a value that indicates the reading order of the object.
-     */
-    dir: string;
-    /**
-     * Gets an object representing the document type declaration associated with the current document.
-     */
-    readonly doctype: DocumentType;
-    /**
-     * Gets a reference to the root node of the document.
-     */
-    readonly documentElement: HTMLElement;
-    /**
-     * Sets or gets the security domain of the document.
-     */
-    domain: string;
-    /**
-     * Retrieves a collection of all embed objects in the document.
-     */
-    readonly embeds: HTMLCollectionOf<HTMLEmbedElement>;
-    /**
-     * Sets or gets the foreground (text) color of the document.
-     */
-    fgColor: string;
-    /**
-     * Retrieves a collection, in source order, of all form objects in the document.
-     */
-    readonly forms: HTMLCollectionOf<HTMLFormElement>;
-    readonly fullscreenElement: Element | null;
-    readonly fullscreenEnabled: boolean;
-    readonly head: HTMLHeadElement;
-    readonly hidden: boolean;
-    /**
-     * Retrieves a collection, in source order, of img objects in the document.
-     */
-    readonly images: HTMLCollectionOf<HTMLImageElement>;
-    /**
-     * Gets the implementation object of the current document.
-     */
-    readonly implementation: DOMImplementation;
-    /**
-     * Returns the character encoding used to create the webpage that is loaded into the document object.
-     */
-    readonly inputEncoding: string | null;
-    /**
-     * Gets the date that the page was last modified, if the page supplies one.
-     */
-    readonly lastModified: string;
-    /**
-     * Sets or gets the color of the document links.
-     */
-    linkColor: string;
-    /**
-     * Retrieves a collection of all a objects that specify the href property and all area objects in the document.
-     */
-    readonly links: HTMLCollectionOf<HTMLAnchorElement | HTMLAreaElement>;
-    /**
-     * Contains information about the current URL.
-     */
-    location: Location;
-    msCSSOMElementFloatMetrics: boolean;
-    msCapsLockWarningOff: boolean;
-    /**
-     * Fires when the user aborts the download.
-     * @param ev The event.
-     */
-    onabort: ((this: Document, ev: UIEvent) => any) | null;
-    /**
-     * Fires when the object is set as the active element.
-     * @param ev The event.
-     */
-    onactivate: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires immediately before the object is set as the active element.
-     * @param ev The event.
-     */
-    onbeforeactivate: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires immediately before the activeElement is changed from the current object to another object in the parent document.
-     * @param ev The event.
-     */
-    onbeforedeactivate: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the object loses the input focus.
-     * @param ev The focus event.
-     */
-    onblur: ((this: Document, ev: FocusEvent) => any) | null;
-    /**
-     * Occurs when playback is possible, but would require further buffering.
-     * @param ev The event.
-     */
-    oncanplay: ((this: Document, ev: Event) => any) | null;
-    oncanplaythrough: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the contents of the object or selection have changed.
-     * @param ev The event.
-     */
-    onchange: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the user clicks the left mouse button on the object
-     * @param ev The mouse event.
-     */
-    onclick: ((this: Document, ev: MouseEvent) => any) | null;
-    /**
-     * Fires when the user clicks the right mouse button in the client area, opening the context menu.
-     * @param ev The mouse event.
-     */
-    oncontextmenu: ((this: Document, ev: PointerEvent) => any) | null;
-    /**
-     * Fires when the user double-clicks the object.
-     * @param ev The mouse event.
-     */
-    ondblclick: ((this: Document, ev: MouseEvent) => any) | null;
-    /**
-     * Fires when the activeElement is changed from the current object to another object in the parent document.
-     * @param ev The UI Event
-     */
-    ondeactivate: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires on the source object continuously during a drag operation.
-     * @param ev The event.
-     */
-    ondrag: ((this: Document, ev: DragEvent) => any) | null;
-    /**
-     * Fires on the source object when the user releases the mouse at the close of a drag operation.
-     * @param ev The event.
-     */
-    ondragend: ((this: Document, ev: DragEvent) => any) | null;
-    /**
-     * Fires on the target element when the user drags the object to a valid drop target.
-     * @param ev The drag event.
-     */
-    ondragenter: ((this: Document, ev: DragEvent) => any) | null;
-    /**
-     * Fires on the target object when the user moves the mouse out of a valid drop target during a drag operation.
-     * @param ev The drag event.
-     */
-    ondragleave: ((this: Document, ev: DragEvent) => any) | null;
-    /**
-     * Fires on the target element continuously while the user drags the object over a valid drop target.
-     * @param ev The event.
-     */
-    ondragover: ((this: Document, ev: DragEvent) => any) | null;
-    /**
-     * Fires on the source object when the user starts to drag a text selection or selected object.
-     * @param ev The event.
-     */
-    ondragstart: ((this: Document, ev: DragEvent) => any) | null;
-    ondrop: ((this: Document, ev: DragEvent) => any) | null;
-    /**
-     * Occurs when the duration attribute is updated.
-     * @param ev The event.
-     */
-    ondurationchange: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when the media element is reset to its initial state.
-     * @param ev The event.
-     */
-    onemptied: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when the end of playback is reached.
-     * @param ev The event
-     */
-    onended: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when an error occurs during object loading.
-     * @param ev The event.
-     */
-    onerror: ((this: Document, ev: ErrorEvent) => any) | null;
-    /**
-     * Fires when the object receives focus.
-     * @param ev The event.
-     */
-    onfocus: ((this: Document, ev: FocusEvent) => any) | null;
-    onfullscreenchange: ((this: Document, ev: Event) => any) | null;
-    onfullscreenerror: ((this: Document, ev: Event) => any) | null;
-    oninput: ((this: Document, ev: Event) => any) | null;
-    oninvalid: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the user presses a key.
-     * @param ev The keyboard event
-     */
-    onkeydown: ((this: Document, ev: KeyboardEvent) => any) | null;
-    /**
-     * Fires when the user presses an alphanumeric key.
-     * @param ev The event.
-     */
-    onkeypress: ((this: Document, ev: KeyboardEvent) => any) | null;
-    /**
-     * Fires when the user releases a key.
-     * @param ev The keyboard event
-     */
-    onkeyup: ((this: Document, ev: KeyboardEvent) => any) | null;
-    /**
-     * Fires immediately after the browser loads the object.
-     * @param ev The event.
-     */
-    onload: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when media data is loaded at the current playback position.
-     * @param ev The event.
-     */
-    onloadeddata: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when the duration and dimensions of the media have been determined.
-     * @param ev The event.
-     */
-    onloadedmetadata: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when Internet Explorer begins looking for media data.
-     * @param ev The event.
-     */
-    onloadstart: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the user clicks the object with either mouse button.
-     * @param ev The mouse event.
-     */
-    onmousedown: ((this: Document, ev: MouseEvent) => any) | null;
-    /**
-     * Fires when the user moves the mouse over the object.
-     * @param ev The mouse event.
-     */
-    onmousemove: ((this: Document, ev: MouseEvent) => any) | null;
-    /**
-     * Fires when the user moves the mouse pointer outside the boundaries of the object.
-     * @param ev The mouse event.
-     */
-    onmouseout: ((this: Document, ev: MouseEvent) => any) | null;
-    /**
-     * Fires when the user moves the mouse pointer into the object.
-     * @param ev The mouse event.
-     */
-    onmouseover: ((this: Document, ev: MouseEvent) => any) | null;
-    /**
-     * Fires when the user releases a mouse button while the mouse is over the object.
-     * @param ev The mouse event.
-     */
-    onmouseup: ((this: Document, ev: MouseEvent) => any) | null;
-    /**
-     * Fires when the wheel button is rotated.
-     * @param ev The mouse event
-     */
-    onmousewheel: ((this: Document, ev: WheelEvent) => any) | null;
-    onmscontentzoom: ((this: Document, ev: Event) => any) | null;
-    onmsgesturechange: ((this: Document, ev: Event) => any) | null;
-    onmsgesturedoubletap: ((this: Document, ev: Event) => any) | null;
-    onmsgestureend: ((this: Document, ev: Event) => any) | null;
-    onmsgesturehold: ((this: Document, ev: Event) => any) | null;
-    onmsgesturestart: ((this: Document, ev: Event) => any) | null;
-    onmsgesturetap: ((this: Document, ev: Event) => any) | null;
-    onmsinertiastart: ((this: Document, ev: Event) => any) | null;
-    onmsmanipulationstatechanged: ((this: Document, ev: Event) => any) | null;
-    onmspointercancel: ((this: Document, ev: Event) => any) | null;
-    onmspointerdown: ((this: Document, ev: Event) => any) | null;
-    onmspointerenter: ((this: Document, ev: Event) => any) | null;
-    onmspointerleave: ((this: Document, ev: Event) => any) | null;
-    onmspointermove: ((this: Document, ev: Event) => any) | null;
-    onmspointerout: ((this: Document, ev: Event) => any) | null;
-    onmspointerover: ((this: Document, ev: Event) => any) | null;
-    onmspointerup: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when an item is removed from a Jump List of a webpage running in Site Mode.
-     * @param ev The event.
-     */
-    onmssitemodejumplistitemremoved: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when a user clicks a button in a Thumbnail Toolbar of a webpage running in Site Mode.
-     * @param ev The event.
-     */
-    onmsthumbnailclick: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when playback is paused.
-     * @param ev The event.
-     */
-    onpause: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when the play method is requested.
-     * @param ev The event.
-     */
-    onplay: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when the audio or video has started playing.
-     * @param ev The event.
-     */
-    onplaying: ((this: Document, ev: Event) => any) | null;
-    onpointerlockchange: ((this: Document, ev: Event) => any) | null;
-    onpointerlockerror: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs to indicate progress while downloading media data.
-     * @param ev The event.
-     */
-    onprogress: ((this: Document, ev: ProgressEvent) => any) | null;
-    /**
-     * Occurs when the playback rate is increased or decreased.
-     * @param ev The event.
-     */
-    onratechange: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the state of the object has changed.
-     * @param ev The event
-     */
-    onreadystatechange: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the user resets a form.
-     * @param ev The event.
-     */
-    onreset: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the user repositions the scroll box in the scroll bar on the object.
-     * @param ev The event.
-     */
-    onscroll: ((this: Document, ev: UIEvent) => any) | null;
-    /**
-     * Occurs when the seek operation ends.
-     * @param ev The event.
-     */
-    onseeked: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when the current playback position is moved.
-     * @param ev The event.
-     */
-    onseeking: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the current selection changes.
-     * @param ev The event.
-     */
-    onselect: ((this: Document, ev: UIEvent) => any) | null;
-    /**
-     * Fires when the selection state of a document changes.
-     * @param ev The event.
-     */
-    onselectionchange: ((this: Document, ev: Event) => any) | null;
-    onselectstart: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when the download has stopped.
-     * @param ev The event.
-     */
-    onstalled: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the user clicks the Stop button or leaves the Web page.
-     * @param ev The event.
-     */
-    onstop: ((this: Document, ev: Event) => any) | null;
-    onsubmit: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs if the load operation has been intentionally halted.
-     * @param ev The event.
-     */
-    onsuspend: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs to indicate the current playback position.
-     * @param ev The event.
-     */
-    ontimeupdate: ((this: Document, ev: Event) => any) | null;
-    ontouchcancel: ((this: Document, ev: TouchEvent) => any) | null;
-    ontouchend: ((this: Document, ev: TouchEvent) => any) | null;
-    ontouchmove: ((this: Document, ev: TouchEvent) => any) | null;
-    ontouchstart: ((this: Document, ev: TouchEvent) => any) | null;
-    onvisibilitychange: (this: Document, ev: Event) => any;
-    /**
-     * Occurs when the volume is changed, or playback is muted or unmuted.
-     * @param ev The event.
-     */
-    onvolumechange: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when playback stops because the next frame of a video resource is not available.
-     * @param ev The event.
-     */
-    onwaiting: ((this: Document, ev: Event) => any) | null;
-    onwebkitfullscreenchange: ((this: Document, ev: Event) => any) | null;
-    onwebkitfullscreenerror: ((this: Document, ev: Event) => any) | null;
-    readonly plugins: HTMLCollectionOf<HTMLEmbedElement>;
-    readonly pointerLockElement: Element;
-    /**
-     * Retrieves a value that indicates the current state of the object.
-     */
-    readonly readyState: DocumentReadyState;
-    /**
-     * Gets the URL of the location that referred the user to the current page.
-     */
-    readonly referrer: string;
-    /**
-     * Gets the root svg element in the document hierarchy.
-     */
-    readonly rootElement: SVGSVGElement;
-    /**
-     * Retrieves a collection of all script objects in the document.
-     */
-    readonly scripts: HTMLCollectionOf<HTMLScriptElement>;
-    readonly scrollingElement: Element | null;
-    /**
-     * Retrieves a collection of styleSheet objects representing the style sheets that correspond to each instance of a link or style object in the document.
-     */
-    readonly styleSheets: StyleSheetList;
-    /**
-     * Contains the title of the document.
-     */
-    title: string;
-    readonly visibilityState: VisibilityState;
-    /**
-     * Sets or gets the color of the links that the user has visited.
-     */
-    vlinkColor: string;
-    readonly webkitCurrentFullScreenElement: Element | null;
-    readonly webkitFullscreenElement: Element | null;
-    readonly webkitFullscreenEnabled: boolean;
-    readonly webkitIsFullScreen: boolean;
-    readonly xmlEncoding: string | null;
-    xmlStandalone: boolean;
-    /**
-     * Gets or sets the version attribute specified in the declaration of an XML document.
-     */
-    xmlVersion: string | null;
-    adoptNode<T extends Node>(source: T): T;
-    captureEvents(): void;
-    caretRangeFromPoint(x: number, y: number): Range;
-    clear(): void;
-    /**
-     * Closes an output stream and forces the sent data to display.
-     */
-    close(): void;
-    /**
-     * Creates an attribute object with a specified name.
-     * @param name String that sets the attribute object's name.
-     */
-    createAttribute(name: string): Attr;
-    createAttributeNS(namespaceURI: string | null, qualifiedName: string): Attr;
-    createCDATASection(data: string): CDATASection;
-    /**
-     * Creates a comment object with the specified data.
-     * @param data Sets the comment object's data.
-     */
-    createComment(data: string): Comment;
-    /**
-     * Creates a new document.
-     */
-    createDocumentFragment(): DocumentFragment;
-    /**
-     * Creates an instance of the element for the specified tag.
-     * @param tagName The name of an element.
-     */
-    createElement<K extends keyof HTMLElementTagNameMap>(tagName: K, options?: ElementCreationOptions): HTMLElementTagNameMap[K];
-    createElement(tagName: string, options?: ElementCreationOptions): HTMLElement;
-    createElementNS(namespaceURI: "http://www.w3.org/1999/xhtml", qualifiedName: string): HTMLElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "a"): SVGAElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "circle"): SVGCircleElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "clipPath"): SVGClipPathElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "componentTransferFunction"): SVGComponentTransferFunctionElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "defs"): SVGDefsElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "desc"): SVGDescElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "ellipse"): SVGEllipseElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feBlend"): SVGFEBlendElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feColorMatrix"): SVGFEColorMatrixElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feComponentTransfer"): SVGFEComponentTransferElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feComposite"): SVGFECompositeElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feConvolveMatrix"): SVGFEConvolveMatrixElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feDiffuseLighting"): SVGFEDiffuseLightingElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feDisplacementMap"): SVGFEDisplacementMapElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feDistantLight"): SVGFEDistantLightElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feFlood"): SVGFEFloodElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feFuncA"): SVGFEFuncAElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feFuncB"): SVGFEFuncBElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feFuncG"): SVGFEFuncGElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feFuncR"): SVGFEFuncRElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feGaussianBlur"): SVGFEGaussianBlurElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feImage"): SVGFEImageElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feMerge"): SVGFEMergeElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feMergeNode"): SVGFEMergeNodeElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feMorphology"): SVGFEMorphologyElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feOffset"): SVGFEOffsetElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "fePointLight"): SVGFEPointLightElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feSpecularLighting"): SVGFESpecularLightingElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feSpotLight"): SVGFESpotLightElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feTile"): SVGFETileElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feTurbulence"): SVGFETurbulenceElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "filter"): SVGFilterElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "foreignObject"): SVGForeignObjectElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "g"): SVGGElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "image"): SVGImageElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "gradient"): SVGGradientElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "line"): SVGLineElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "linearGradient"): SVGLinearGradientElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "marker"): SVGMarkerElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "mask"): SVGMaskElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "path"): SVGPathElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "metadata"): SVGMetadataElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "pattern"): SVGPatternElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "polygon"): SVGPolygonElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "polyline"): SVGPolylineElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "radialGradient"): SVGRadialGradientElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "rect"): SVGRectElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "svg"): SVGSVGElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "script"): SVGScriptElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "stop"): SVGStopElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "style"): SVGStyleElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "switch"): SVGSwitchElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "symbol"): SVGSymbolElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "tspan"): SVGTSpanElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "textContent"): SVGTextContentElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "text"): SVGTextElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "textPath"): SVGTextPathElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "textPositioning"): SVGTextPositioningElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "title"): SVGTitleElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "use"): SVGUseElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "view"): SVGViewElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: string): SVGElement;
-    createElementNS(namespaceURI: string | null, qualifiedName: string): Element;
-    createExpression(expression: string, resolver: XPathNSResolver): XPathExpression;
-    createNSResolver(nodeResolver: Node): XPathNSResolver;
-    /**
-     * Creates a NodeIterator object that you can use to traverse filtered lists of nodes or elements in a document.
-     * @param root The root element or node to start traversing on.
-     * @param whatToShow The type of nodes or elements to appear in the node list
-     * @param filter A custom NodeFilter function to use. For more information, see filter. Use null for no filter.
-     * @param entityReferenceExpansion A flag that specifies whether entity reference nodes are expanded.
-     */
-    createNodeIterator(root: Node, whatToShow?: number, filter?: NodeFilter, entityReferenceExpansion?: boolean): NodeIterator;
-    createProcessingInstruction(target: string, data: string): ProcessingInstruction;
-    /**
-     *  Returns an empty range object that has both of its boundary points positioned at the beginning of the document.
-     */
-    createRange(): Range;
-    /**
-     * Creates a text string from the specified value.
-     * @param data String that specifies the nodeValue property of the text node.
-     */
-    createTextNode(data: string): Text;
-    createTouch(view: Window, target: EventTarget, identifier: number, pageX: number, pageY: number, screenX: number, screenY: number): Touch;
-    createTouchList(...touches: Touch[]): TouchList;
-    /**
-     * Creates a TreeWalker object that you can use to traverse filtered lists of nodes or elements in a document.
-     * @param root The root element or node to start traversing on.
-     * @param whatToShow The type of nodes or elements to appear in the node list. For more information, see whatToShow.
-     * @param filter A custom NodeFilter function to use.
-     * @param entityReferenceExpansion A flag that specifies whether entity reference nodes are expanded.
-     */
-    createTreeWalker(root: Node, whatToShow?: number, filter?: NodeFilter, entityReferenceExpansion?: boolean): TreeWalker;
-    /**
-     * Returns the element for the specified x coordinate and the specified y coordinate.
-     * @param x The x-offset
-     * @param y The y-offset
-     */
-    elementFromPoint(x: number, y: number): Element;
-    elementsFromPoint(x: number, y: number): Element[];
-    evaluate(expression: string, contextNode: Node, resolver: XPathNSResolver | null, type: number, result: XPathResult | null): XPathResult;
-    /**
-     * Executes a command on the current document, current selection, or the given range.
-     * @param commandId String that specifies the command to execute. This command can be any of the command identifiers that can be executed in script.
-     * @param showUI Display the user interface, defaults to false.
-     * @param value Value to assign.
-     */
-    execCommand(commandId: string, showUI?: boolean, value?: any): boolean;
-    /**
-     * Displays help information for the given command identifier.
-     * @param commandId Displays help information for the given command identifier.
-     */
-    execCommandShowHelp(commandId: string): boolean;
-    exitFullscreen(): void;
-    exitPointerLock(): void;
-    /**
-     * Causes the element to receive the focus and executes the code specified by the onfocus event.
-     */
-    /** @deprecated */
-    focus(): void;
-    /**
-     * Returns a reference to the first object with the specified value of the ID or NAME attribute.
-     * @param elementId String that specifies the ID value. Case-insensitive.
-     */
-    getElementById(elementId: string): HTMLElement | null;
-    getElementsByClassName(classNames: string): HTMLCollectionOf<Element>;
-    /**
-     * Gets a collection of objects based on the value of the NAME or ID attribute.
-     * @param elementName Gets a collection of objects based on the value of the NAME or ID attribute.
-     */
-    getElementsByName(elementName: string): NodeListOf<HTMLElement>;
-    /**
-     * Retrieves a collection of objects based on the specified element name.
-     * @param name Specifies the name of an element.
-     */
-    getElementsByTagName<K extends keyof HTMLElementTagNameMap>(tagname: K): NodeListOf<HTMLElementTagNameMap[K]>;
-    getElementsByTagName<K extends keyof SVGElementTagNameMap>(tagname: K): NodeListOf<SVGElementTagNameMap[K]>;
-    getElementsByTagName(tagname: string): NodeListOf<Element>;
-    getElementsByTagNameNS(namespaceURI: "http://www.w3.org/1999/xhtml", localName: string): HTMLCollectionOf<HTMLElement>;
-    getElementsByTagNameNS(namespaceURI: "http://www.w3.org/2000/svg", localName: string): HTMLCollectionOf<SVGElement>;
-    getElementsByTagNameNS(namespaceURI: string, localName: string): HTMLCollectionOf<Element>;
-    /**
-     * Returns an object representing the current selection of the document that is loaded into the object displaying a webpage.
-     */
-    getSelection(): Selection;
-    /**
-     * Gets a value indicating whether the object currently has focus.
-     */
-    hasFocus(): boolean;
-    importNode<T extends Node>(importedNode: T, deep: boolean): T;
-    msElementsFromPoint(x: number, y: number): NodeListOf<Element>;
-    msElementsFromRect(left: number, top: number, width: number, height: number): NodeListOf<Element>;
-    /**
-     * Opens a new window and loads a document specified by a given URL. Also, opens a new window that uses the url parameter and the name parameter to collect the output of the write method and the writeln method.
-     * @param url Specifies a MIME type for the document.
-     * @param name Specifies the name of the window. This name is used as the value for the TARGET attribute on a form or an anchor element.
-     * @param features Contains a list of items separated by commas. Each item consists of an option and a value, separated by an equals sign (for example, "fullscreen=yes, toolbar=yes"). The following values are supported.
-     * @param replace Specifies whether the existing entry for the document is replaced in the history list.
-     */
-    open(url?: string, name?: string, features?: string, replace?: boolean): Document;
-    /**
-     * Returns a Boolean value that indicates whether a specified command can be successfully executed using execCommand, given the current state of the document.
-     * @param commandId Specifies a command identifier.
-     */
-    queryCommandEnabled(commandId: string): boolean;
-    /**
-     * Returns a Boolean value that indicates whether the specified command is in the indeterminate state.
-     * @param commandId String that specifies a command identifier.
-     */
-    queryCommandIndeterm(commandId: string): boolean;
-    /**
-     * Returns a Boolean value that indicates the current state of the command.
-     * @param commandId String that specifies a command identifier.
-     */
-    queryCommandState(commandId: string): boolean;
-    /**
-     * Returns a Boolean value that indicates whether the current command is supported on the current range.
-     * @param commandId Specifies a command identifier.
-     */
-    queryCommandSupported(commandId: string): boolean;
-    /**
-     * Retrieves the string associated with a command.
-     * @param commandId String that contains the identifier of a command. This can be any command identifier given in the list of Command Identifiers.
-     */
-    queryCommandText(commandId: string): string;
-    /**
-     * Returns the current value of the document, range, or current selection for the given command.
-     * @param commandId String that specifies a command identifier.
-     */
-    queryCommandValue(commandId: string): string;
-    releaseEvents(): void;
-    updateSettings(): void;
-    webkitCancelFullScreen(): void;
-    webkitExitFullscreen(): void;
-    /**
-     * Writes one or more HTML expressions to a document in the specified window.
-     * @param content Specifies the text and HTML tags to write.
-     */
-    write(...content: string[]): void;
-    /**
-     * Writes one or more HTML expressions, followed by a carriage return, to a document in the specified window.
-     * @param content The text and HTML tags to write.
-     */
-    writeln(...content: string[]): void;
-    addEventListener<K extends keyof DocumentEventMap>(type: K, listener: (this: Document, ev: DocumentEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof DocumentEventMap>(type: K, listener: (this: Document, ev: DocumentEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var Document: {
-    prototype: Document;
-    new(): Document;
-};
-
-interface DocumentEvent {
-    createEvent(eventInterface: "AnimationEvent"): AnimationEvent;
-    createEvent(eventInterface: "AnimationPlaybackEvent"): AnimationPlaybackEvent;
-    createEvent(eventInterface: "AudioProcessingEvent"): AudioProcessingEvent;
-    createEvent(eventInterface: "BeforeUnloadEvent"): BeforeUnloadEvent;
-    createEvent(eventInterface: "ClipboardEvent"): ClipboardEvent;
-    createEvent(eventInterface: "CloseEvent"): CloseEvent;
-    createEvent(eventInterface: "CompositionEvent"): CompositionEvent;
-    createEvent(eventInterface: "CustomEvent"): CustomEvent;
-    createEvent(eventInterface: "DeviceLightEvent"): DeviceLightEvent;
-    createEvent(eventInterface: "DeviceMotionEvent"): DeviceMotionEvent;
-    createEvent(eventInterface: "DeviceOrientationEvent"): DeviceOrientationEvent;
-    createEvent(eventInterface: "DragEvent"): DragEvent;
-    createEvent(eventInterface: "ErrorEvent"): ErrorEvent;
-    createEvent(eventInterface: "Event"): Event;
-    createEvent(eventInterface: "Events"): Event;
-    createEvent(eventInterface: "FocusEvent"): FocusEvent;
-    createEvent(eventInterface: "FocusNavigationEvent"): FocusNavigationEvent;
-    createEvent(eventInterface: "GamepadEvent"): GamepadEvent;
-    createEvent(eventInterface: "HashChangeEvent"): HashChangeEvent;
-    createEvent(eventInterface: "IDBVersionChangeEvent"): IDBVersionChangeEvent;
-    createEvent(eventInterface: "KeyboardEvent"): KeyboardEvent;
-    createEvent(eventInterface: "ListeningStateChangedEvent"): ListeningStateChangedEvent;
-    createEvent(eventInterface: "MSDCCEvent"): MSDCCEvent;
-    createEvent(eventInterface: "MSDSHEvent"): MSDSHEvent;
-    createEvent(eventInterface: "MSMediaKeyMessageEvent"): MSMediaKeyMessageEvent;
-    createEvent(eventInterface: "MSMediaKeyNeededEvent"): MSMediaKeyNeededEvent;
-    createEvent(eventInterface: "MediaEncryptedEvent"): MediaEncryptedEvent;
-    createEvent(eventInterface: "MediaKeyMessageEvent"): MediaKeyMessageEvent;
-    createEvent(eventInterface: "MediaStreamErrorEvent"): MediaStreamErrorEvent;
-    createEvent(eventInterface: "MediaStreamEvent"): MediaStreamEvent;
-    createEvent(eventInterface: "MediaStreamTrackEvent"): MediaStreamTrackEvent;
-    createEvent(eventInterface: "MessageEvent"): MessageEvent;
-    createEvent(eventInterface: "MouseEvent"): MouseEvent;
-    createEvent(eventInterface: "MouseEvents"): MouseEvent;
-    createEvent(eventInterface: "MutationEvent"): MutationEvent;
-    createEvent(eventInterface: "MutationEvents"): MutationEvent;
-    createEvent(eventInterface: "OfflineAudioCompletionEvent"): OfflineAudioCompletionEvent;
-    createEvent(eventInterface: "OverflowEvent"): OverflowEvent;
-    createEvent(eventInterface: "PageTransitionEvent"): PageTransitionEvent;
-    createEvent(eventInterface: "PaymentRequestUpdateEvent"): PaymentRequestUpdateEvent;
-    createEvent(eventInterface: "PermissionRequestedEvent"): PermissionRequestedEvent;
-    createEvent(eventInterface: "PointerEvent"): PointerEvent;
-    createEvent(eventInterface: "PopStateEvent"): PopStateEvent;
-    createEvent(eventInterface: "ProgressEvent"): ProgressEvent;
-    createEvent(eventInterface: "PromiseRejectionEvent"): PromiseRejectionEvent;
-    createEvent(eventInterface: "RTCDTMFToneChangeEvent"): RTCDTMFToneChangeEvent;
-    createEvent(eventInterface: "RTCDtlsTransportStateChangedEvent"): RTCDtlsTransportStateChangedEvent;
-    createEvent(eventInterface: "RTCIceCandidatePairChangedEvent"): RTCIceCandidatePairChangedEvent;
-    createEvent(eventInterface: "RTCIceGathererEvent"): RTCIceGathererEvent;
-    createEvent(eventInterface: "RTCIceTransportStateChangedEvent"): RTCIceTransportStateChangedEvent;
-    createEvent(eventInterface: "RTCPeerConnectionIceEvent"): RTCPeerConnectionIceEvent;
-    createEvent(eventInterface: "RTCSsrcConflictEvent"): RTCSsrcConflictEvent;
-    createEvent(eventInterface: "SVGZoomEvent"): SVGZoomEvent;
-    createEvent(eventInterface: "SVGZoomEvents"): SVGZoomEvent;
-    createEvent(eventInterface: "SecurityPolicyViolationEvent"): SecurityPolicyViolationEvent;
-    createEvent(eventInterface: "ServiceWorkerMessageEvent"): ServiceWorkerMessageEvent;
-    createEvent(eventInterface: "SpeechSynthesisEvent"): SpeechSynthesisEvent;
-    createEvent(eventInterface: "StorageEvent"): StorageEvent;
-    createEvent(eventInterface: "TextEvent"): TextEvent;
-    createEvent(eventInterface: "TouchEvent"): TouchEvent;
-    createEvent(eventInterface: "TrackEvent"): TrackEvent;
-    createEvent(eventInterface: "TransitionEvent"): TransitionEvent;
-    createEvent(eventInterface: "UIEvent"): UIEvent;
-    createEvent(eventInterface: "UIEvents"): UIEvent;
-    createEvent(eventInterface: "VRDisplayEvent"): VRDisplayEvent;
-    createEvent(eventInterface: "VRDisplayEvent "): VRDisplayEvent ;
-    createEvent(eventInterface: "WebGLContextEvent"): WebGLContextEvent;
-    createEvent(eventInterface: "WheelEvent"): WheelEvent;
-    createEvent(eventInterface: string): Event;
-}
-
-interface DocumentFragment extends Node, ParentNode {
-    getElementById(elementId: string): HTMLElement | null;
-}
-
-declare var DocumentFragment: {
-    prototype: DocumentFragment;
-    new(): DocumentFragment;
-};
-
-interface DocumentOrShadowRoot {
-    readonly activeElement: Element | null;
-    readonly styleSheets: StyleSheetList;
-    elementFromPoint(x: number, y: number): Element | null;
-    elementsFromPoint(x: number, y: number): Element[];
-    getSelection(): Selection | null;
-}
-
-interface DocumentType extends Node, ChildNode {
-    readonly entities: NamedNodeMap;
-    readonly internalSubset: string | null;
-    readonly name: string;
-    readonly notations: NamedNodeMap;
-    readonly publicId: string;
-    readonly systemId: string;
-}
-
-declare var DocumentType: {
-    prototype: DocumentType;
-    new(): DocumentType;
-};
-
-interface DragEvent extends MouseEvent {
-    readonly dataTransfer: DataTransfer;
-    initDragEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number, screenXArg: number, screenYArg: number, clientXArg: number, clientYArg: number, ctrlKeyArg: boolean, altKeyArg: boolean, shiftKeyArg: boolean, metaKeyArg: boolean, buttonArg: number, relatedTargetArg: EventTarget, dataTransferArg: DataTransfer): void;
-    msConvertURL(file: File, targetType: string, targetURL?: string): void;
-}
-
-declare var DragEvent: {
-    prototype: DragEvent;
-    new(type: "drag" | "dragend" | "dragenter" | "dragexit" | "dragleave" | "dragover" | "dragstart" | "drop", dragEventInit?: { dataTransfer?: DataTransfer }): DragEvent;
-};
-
-interface DynamicsCompressorNode extends AudioNode {
-    readonly attack: AudioParam;
-    readonly knee: AudioParam;
-    readonly ratio: AudioParam;
-    readonly reduction: number;
-    readonly release: AudioParam;
-    readonly threshold: AudioParam;
-}
-
-declare var DynamicsCompressorNode: {
-    prototype: DynamicsCompressorNode;
-    new(): DynamicsCompressorNode;
-};
-
-interface EXT_blend_minmax {
-    readonly MAX_EXT: number;
-    readonly MIN_EXT: number;
-}
-
-interface EXT_frag_depth {
-}
-
-interface EXT_sRGB {
-    readonly FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING_EXT: number;
-    readonly SRGB8_ALPHA8_EXT: number;
-    readonly SRGB_ALPHA_EXT: number;
-    readonly SRGB_EXT: number;
-}
-
-interface EXT_shader_texture_lod {
-}
-
-interface EXT_texture_filter_anisotropic {
-    readonly MAX_TEXTURE_MAX_ANISOTROPY_EXT: number;
-    readonly TEXTURE_MAX_ANISOTROPY_EXT: number;
-}
-
-declare var EXT_texture_filter_anisotropic: {
-    prototype: EXT_texture_filter_anisotropic;
-    new(): EXT_texture_filter_anisotropic;
-    readonly MAX_TEXTURE_MAX_ANISOTROPY_EXT: number;
-    readonly TEXTURE_MAX_ANISOTROPY_EXT: number;
-};
-
-interface ElementEventMap extends GlobalEventHandlersEventMap {
-    "ariarequest": Event;
-    "command": Event;
-    "gotpointercapture": PointerEvent;
-    "lostpointercapture": PointerEvent;
-    "MSGestureChange": Event;
-    "MSGestureDoubleTap": Event;
-    "MSGestureEnd": Event;
-    "MSGestureHold": Event;
-    "MSGestureStart": Event;
-    "MSGestureTap": Event;
-    "MSGotPointerCapture": Event;
-    "MSInertiaStart": Event;
-    "MSLostPointerCapture": Event;
-    "MSPointerCancel": Event;
-    "MSPointerDown": Event;
-    "MSPointerEnter": Event;
-    "MSPointerLeave": Event;
-    "MSPointerMove": Event;
-    "MSPointerOut": Event;
-    "MSPointerOver": Event;
-    "MSPointerUp": Event;
-    "touchcancel": TouchEvent;
-    "touchend": TouchEvent;
-    "touchmove": TouchEvent;
-    "touchstart": TouchEvent;
-    "webkitfullscreenchange": Event;
-    "webkitfullscreenerror": Event;
-}
-
-interface Element extends Node, GlobalEventHandlers, ElementTraversal, ParentNode, ChildNode {
-    readonly assignedSlot: HTMLSlotElement | null;
-    readonly attributes: NamedNodeMap;
-    readonly classList: DOMTokenList;
-    className: string;
-    readonly clientHeight: number;
-    readonly clientLeft: number;
-    readonly clientTop: number;
-    readonly clientWidth: number;
-    id: string;
-    innerHTML: string;
-    msContentZoomFactor: number;
-    readonly msRegionOverflow: string;
-    onariarequest: ((this: Element, ev: Event) => any) | null;
-    oncommand: ((this: Element, ev: Event) => any) | null;
-    ongotpointercapture: ((this: Element, ev: PointerEvent) => any) | null;
-    onlostpointercapture: ((this: Element, ev: PointerEvent) => any) | null;
-    onmsgesturechange: ((this: Element, ev: Event) => any) | null;
-    onmsgesturedoubletap: ((this: Element, ev: Event) => any) | null;
-    onmsgestureend: ((this: Element, ev: Event) => any) | null;
-    onmsgesturehold: ((this: Element, ev: Event) => any) | null;
-    onmsgesturestart: ((this: Element, ev: Event) => any) | null;
-    onmsgesturetap: ((this: Element, ev: Event) => any) | null;
-    onmsgotpointercapture: ((this: Element, ev: Event) => any) | null;
-    onmsinertiastart: ((this: Element, ev: Event) => any) | null;
-    onmslostpointercapture: ((this: Element, ev: Event) => any) | null;
-    onmspointercancel: ((this: Element, ev: Event) => any) | null;
-    onmspointerdown: ((this: Element, ev: Event) => any) | null;
-    onmspointerenter: ((this: Element, ev: Event) => any) | null;
-    onmspointerleave: ((this: Element, ev: Event) => any) | null;
-    onmspointermove: ((this: Element, ev: Event) => any) | null;
-    onmspointerout: ((this: Element, ev: Event) => any) | null;
-    onmspointerover: ((this: Element, ev: Event) => any) | null;
-    onmspointerup: ((this: Element, ev: Event) => any) | null;
-    ontouchcancel: ((this: Element, ev: TouchEvent) => any) | null;
-    ontouchend: ((this: Element, ev: TouchEvent) => any) | null;
-    ontouchmove: ((this: Element, ev: TouchEvent) => any) | null;
-    ontouchstart: ((this: Element, ev: TouchEvent) => any) | null;
-    onwebkitfullscreenchange: ((this: Element, ev: Event) => any) | null;
-    onwebkitfullscreenerror: ((this: Element, ev: Event) => any) | null;
-    outerHTML: string;
-    readonly prefix: string | null;
-    readonly scrollHeight: number;
-    scrollLeft: number;
-    scrollTop: number;
-    readonly scrollWidth: number;
-    readonly shadowRoot: ShadowRoot | null;
-    slot: string;
-    readonly tagName: string;
-    attachShadow(shadowRootInitDict: ShadowRootInit): ShadowRoot;
-    closest<K extends keyof HTMLElementTagNameMap>(selector: K): HTMLElementTagNameMap[K] | null;
-    closest<K extends keyof SVGElementTagNameMap>(selector: K): SVGElementTagNameMap[K] | null;
-    closest(selector: string): Element | null;
-    getAttribute(qualifiedName: string): string | null;
-    getAttributeNS(namespaceURI: string, localName: string): string;
-    getAttributeNode(name: string): Attr | null;
-    getAttributeNodeNS(namespaceURI: string, localName: string): Attr | null;
-    getBoundingClientRect(): ClientRect | DOMRect;
-    getClientRects(): ClientRectList | DOMRectList;
-    getElementsByClassName(classNames: string): NodeListOf<Element>;
-    getElementsByTagName<K extends keyof HTMLElementTagNameMap>(name: K): NodeListOf<HTMLElementTagNameMap[K]>;
-    getElementsByTagName<K extends keyof SVGElementTagNameMap>(name: K): NodeListOf<SVGElementTagNameMap[K]>;
-    getElementsByTagName(name: string): NodeListOf<Element>;
-    getElementsByTagNameNS(namespaceURI: "http://www.w3.org/1999/xhtml", localName: string): HTMLCollectionOf<HTMLElement>;
-    getElementsByTagNameNS(namespaceURI: "http://www.w3.org/2000/svg", localName: string): HTMLCollectionOf<SVGElement>;
-    getElementsByTagNameNS(namespaceURI: string, localName: string): HTMLCollectionOf<Element>;
-    hasAttribute(name: string): boolean;
-    hasAttributeNS(namespaceURI: string, localName: string): boolean;
-    hasAttributes(): boolean;
-    insertAdjacentElement(position: InsertPosition, insertedElement: Element): Element | null;
-    insertAdjacentHTML(where: InsertPosition, html: string): void;
-    insertAdjacentText(where: InsertPosition, text: string): void;
-    matches(selectors: string): boolean;
-    msGetRegionContent(): any;
-    msGetUntransformedBounds(): ClientRect;
-    msMatchesSelector(selectors: string): boolean;
-    msReleasePointerCapture(pointerId: number): void;
-    msSetPointerCapture(pointerId: number): void;
-    msZoomTo(args: MsZoomToOptions): void;
-    releasePointerCapture(pointerId: number): void;
-    removeAttribute(qualifiedName: string): void;
-    removeAttributeNS(namespaceURI: string, localName: string): void;
-    removeAttributeNode(oldAttr: Attr): Attr;
-    requestFullscreen(): void;
-    requestPointerLock(): void;
-    scroll(options?: ScrollToOptions): void;
-    scroll(x: number, y: number): void;
-    scrollBy(options?: ScrollToOptions): void;
-    scrollBy(x: number, y: number): void;
-    scrollIntoView(arg?: boolean | ScrollIntoViewOptions): void;
-    scrollTo(options?: ScrollToOptions): void;
-    scrollTo(x: number, y: number): void;
-    setAttribute(qualifiedName: string, value: string): void;
-    setAttributeNS(namespaceURI: string, qualifiedName: string, value: string): void;
-    setAttributeNode(newAttr: Attr): Attr;
-    setAttributeNodeNS(newAttr: Attr): Attr;
-    setPointerCapture(pointerId: number): void;
-    webkitMatchesSelector(selectors: string): boolean;
-    webkitRequestFullScreen(): void;
-    webkitRequestFullscreen(): void;
-    addEventListener<K extends keyof ElementEventMap>(type: K, listener: (this: Element, ev: ElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof ElementEventMap>(type: K, listener: (this: Element, ev: ElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var Element: {
-    prototype: Element;
-    new(): Element;
-};
-
-interface ElementCSSInlineStyle {
-    readonly style: CSSStyleDeclaration;
-}
-
-interface ElementCreationOptions {
-    is?: string;
-}
-
-interface ElementDefinitionOptions {
-    extends: string;
-}
-
-interface ElementTraversal {
-    readonly childElementCount: number;
-    readonly firstElementChild: Element | null;
-    readonly lastElementChild: Element | null;
-    readonly nextElementSibling: Element | null;
-    readonly previousElementSibling: Element | null;
-}
-
-interface ErrorEvent extends Event {
-    readonly colno: number;
-    readonly error: any;
-    readonly filename: string;
-    readonly lineno: number;
-    readonly message: string;
-    initErrorEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, messageArg: string, filenameArg: string, linenoArg: number): void;
-}
-
-declare var ErrorEvent: {
-    prototype: ErrorEvent;
-    new(typeArg: string, eventInitDict?: ErrorEventInit): ErrorEvent;
-};
-
-interface Event {
-    readonly bubbles: boolean;
-    cancelBubble: boolean;
-    readonly cancelable: boolean;
-    readonly currentTarget: EventTarget | null;
-    readonly defaultPrevented: boolean;
-    readonly eventPhase: number;
-    readonly isTrusted: boolean;
-    returnValue: boolean;
-    readonly scoped: boolean;
-    readonly srcElement: Element | null;
-    readonly target: EventTarget | null;
-    readonly timeStamp: number;
-    readonly type: string;
-    deepPath(): EventTarget[];
-    initEvent(type: string, bubbles?: boolean, cancelable?: boolean): void;
-    preventDefault(): void;
-    stopImmediatePropagation(): void;
-    stopPropagation(): void;
-    readonly AT_TARGET: number;
-    readonly BUBBLING_PHASE: number;
-    readonly CAPTURING_PHASE: number;
-    readonly NONE: number;
-}
-
-declare var Event: {
-    prototype: Event;
-    new(typeArg: string, eventInitDict?: EventInit): Event;
-    readonly AT_TARGET: number;
-    readonly BUBBLING_PHASE: number;
-    readonly CAPTURING_PHASE: number;
-    readonly NONE: number;
-};
-
-interface EventListenerObject {
-    handleEvent(evt: Event): void;
-}
-
-interface EventSource extends EventTarget {
-    readonly CLOSED: number;
-    readonly CONNECTING: number;
-    readonly OPEN: number;
-    onerror: (evt: MessageEvent) => any;
-    onmessage: (evt: MessageEvent) => any;
-    onopen: (evt: MessageEvent) => any;
-    readonly readyState: number;
-    readonly url: string;
-    readonly withCredentials: boolean;
-    close(): void;
-}
-
-declare var EventSource: {
-    prototype: EventSource;
-    new(url: string, eventSourceInitDict?: EventSourceInit): EventSource;
-};
-
-interface EventSourceInit {
-    readonly withCredentials: boolean;
-}
-
-interface EventTarget {
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject | null, options?: boolean | AddEventListenerOptions): void;
-    dispatchEvent(evt: Event): boolean;
-    removeEventListener(type: string, listener?: EventListenerOrEventListenerObject | null, options?: EventListenerOptions | boolean): void;
-}
-
-declare var EventTarget: {
-    prototype: EventTarget;
-    new(): EventTarget;
-};
-
-interface ExtensionScriptApis {
-    extensionIdToShortId(extensionId: string): number;
-    fireExtensionApiTelemetry(functionName: string, isSucceeded: boolean, isSupported: boolean, errorString: string): void;
-    genericFunction(routerAddress: any, parameters?: string, callbackId?: number): void;
-    genericSynchronousFunction(functionId: number, parameters?: string): string;
-    genericWebRuntimeCallout(to: any, from: any, payload: string): void;
-    getExtensionId(): string;
-    registerGenericFunctionCallbackHandler(callbackHandler: Function): void;
-    registerGenericPersistentCallbackHandler(callbackHandler: Function): void;
-    registerWebRuntimeCallbackHandler(handler: Function): any;
-}
-
-declare var ExtensionScriptApis: {
-    prototype: ExtensionScriptApis;
-    new(): ExtensionScriptApis;
-};
-
-interface External {
-}
-
-declare var External: {
-    prototype: External;
-    new(): External;
-};
-
-interface File extends Blob {
-    readonly lastModified: number;
-    /** @deprecated */
-    readonly lastModifiedDate: Date;
-    readonly name: string;
-    readonly webkitRelativePath: string;
-}
-
-declare var File: {
-    prototype: File;
-    new (parts: (ArrayBuffer | ArrayBufferView | Blob | string)[], filename: string, properties?: FilePropertyBag): File;
-};
-
-interface FileList {
-    readonly length: number;
-    item(index: number): File | null;
-    [index: number]: File;
-}
-
-declare var FileList: {
-    prototype: FileList;
-    new(): FileList;
-};
-
-interface FilePropertyBag extends BlobPropertyBag {
-    lastModified?: number;
-}
-
-interface FileReaderEventMap {
-    "abort": ProgressEvent;
-    "error": ProgressEvent;
-    "load": ProgressEvent;
-    "loadend": ProgressEvent;
-    "loadstart": ProgressEvent;
-    "progress": ProgressEvent;
-}
-
-interface FileReader extends EventTarget {
-    readonly error: DOMException | null;
-    onabort: ((this: FileReader, ev: FileReaderProgressEvent) => any) | null;
-    onerror: ((this: FileReader, ev: FileReaderProgressEvent) => any) | null;
-    onload: ((this: FileReader, ev: FileReaderProgressEvent) => any) | null;
-    onloadend: ((this: FileReader, ev: FileReaderProgressEvent) => any) | null;
-    onloadstart: ((this: FileReader, ev: FileReaderProgressEvent) => any) | null;
-    onprogress: ((this: FileReader, ev: FileReaderProgressEvent) => any) | null;
-    readonly readyState: number;
-    readonly result: any;
-    abort(): void;
-    readAsArrayBuffer(blob: Blob): void;
-    readAsBinaryString(blob: Blob): void;
-    readAsDataURL(blob: Blob): void;
-    readAsText(blob: Blob, label?: string): void;
-    readonly DONE: number;
-    readonly EMPTY: number;
-    readonly LOADING: number;
-    addEventListener<K extends keyof FileReaderEventMap>(type: K, listener: (this: FileReader, ev: FileReaderEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof FileReaderEventMap>(type: K, listener: (this: FileReader, ev: FileReaderEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var FileReader: {
-    prototype: FileReader;
-    new(): FileReader;
-    readonly DONE: number;
-    readonly EMPTY: number;
-    readonly LOADING: number;
-};
-
-interface FileReaderProgressEvent extends ProgressEvent {
-    readonly target: FileReader | null;
-}
-
-interface FocusEvent extends UIEvent {
-    readonly relatedTarget: EventTarget;
-    initFocusEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number, relatedTargetArg: EventTarget): void;
-}
-
-declare var FocusEvent: {
-    prototype: FocusEvent;
-    new(typeArg: string, eventInitDict?: FocusEventInit): FocusEvent;
-};
-
-interface FocusNavigationEvent extends Event {
-    readonly navigationReason: NavigationReason;
-    readonly originHeight: number;
-    readonly originLeft: number;
-    readonly originTop: number;
-    readonly originWidth: number;
-    requestFocus(): void;
-}
-
-declare var FocusNavigationEvent: {
-    prototype: FocusNavigationEvent;
-    new(type: string, eventInitDict?: FocusNavigationEventInit): FocusNavigationEvent;
-};
-
-interface FormData {
-    append(name: string, value: string | Blob, fileName?: string): void;
-    delete(name: string): void;
-    get(name: string): FormDataEntryValue | null;
-    getAll(name: string): FormDataEntryValue[];
-    has(name: string): boolean;
-    set(name: string, value: string | Blob, fileName?: string): void;
-}
-
-declare var FormData: {
-    prototype: FormData;
-    new(): FormData;
-    new(form: HTMLFormElement): FormData;
-};
-
-interface GainNode extends AudioNode {
-    readonly gain: AudioParam;
-}
-
-declare var GainNode: {
-    prototype: GainNode;
-    new(): GainNode;
-};
-
-interface Gamepad {
-    readonly axes: number[];
-    readonly buttons: GamepadButton[];
-    readonly connected: boolean;
-    readonly displayId: number;
-    readonly hand: GamepadHand;
-    readonly hapticActuators: GamepadHapticActuator[];
-    readonly id: string;
-    readonly index: number;
-    readonly mapping: GamepadMappingType;
-    readonly pose: GamepadPose | null;
-    readonly timestamp: number;
-}
-
-declare var Gamepad: {
-    prototype: Gamepad;
-    new(): Gamepad;
-};
-
-interface GamepadButton {
-    readonly pressed: boolean;
-    readonly touched: boolean;
-    readonly value: number;
-}
-
-declare var GamepadButton: {
-    prototype: GamepadButton;
-    new(): GamepadButton;
-};
-
-interface GamepadEvent extends Event {
-    readonly gamepad: Gamepad;
-}
-
-declare var GamepadEvent: {
-    prototype: GamepadEvent;
-    new(typeArg: string, eventInitDict?: GamepadEventInit): GamepadEvent;
-};
-
-interface GamepadHapticActuator {
-    readonly type: GamepadHapticActuatorType;
-    pulse(value: number, duration: number): Promise<boolean>;
-}
-
-declare var GamepadHapticActuator: {
-    prototype: GamepadHapticActuator;
-    new(): GamepadHapticActuator;
-};
-
-interface GamepadPose {
-    readonly angularAcceleration: Float32Array | null;
-    readonly angularVelocity: Float32Array | null;
-    readonly hasOrientation: boolean;
-    readonly hasPosition: boolean;
-    readonly linearAcceleration: Float32Array | null;
-    readonly linearVelocity: Float32Array | null;
-    readonly orientation: Float32Array | null;
-    readonly position: Float32Array | null;
-}
-
-declare var GamepadPose: {
-    prototype: GamepadPose;
-    new(): GamepadPose;
-};
-
-interface Geolocation {
-    clearWatch(watchId: number): void;
-    getCurrentPosition(successCallback: PositionCallback, errorCallback?: PositionErrorCallback, options?: PositionOptions): void;
-    watchPosition(successCallback: PositionCallback, errorCallback?: PositionErrorCallback, options?: PositionOptions): number;
-}
-
-declare var Geolocation: {
-    prototype: Geolocation;
-    new(): Geolocation;
-};
-
-interface GetSVGDocument {
-    getSVGDocument(): Document;
-}
-
-interface GlobalEventHandlersEventMap {
-    "pointercancel": PointerEvent;
-    "pointerdown": PointerEvent;
-    "pointerenter": PointerEvent;
-    "pointerleave": PointerEvent;
-    "pointermove": PointerEvent;
-    "pointerout": PointerEvent;
-    "pointerover": PointerEvent;
-    "pointerup": PointerEvent;
-    "wheel": WheelEvent;
-}
-
-interface GlobalEventHandlers {
-    onpointercancel: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
-    onpointerdown: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
-    onpointerenter: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
-    onpointerleave: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
-    onpointermove: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
-    onpointerout: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
-    onpointerover: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
-    onpointerup: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
-    onwheel: ((this: GlobalEventHandlers, ev: WheelEvent) => any) | null;
-    addEventListener<K extends keyof GlobalEventHandlersEventMap>(type: K, listener: (this: GlobalEventHandlers, ev: GlobalEventHandlersEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof GlobalEventHandlersEventMap>(type: K, listener: (this: GlobalEventHandlers, ev: GlobalEventHandlersEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-interface GlobalFetch {
-    fetch(input?: Request | string, init?: RequestInit): Promise<Response>;
-}
-
-interface HTMLAllCollection {
-    readonly length: number;
-    item(nameOrIndex?: string): HTMLCollection | Element | null;
-    namedItem(name: string): HTMLCollection | Element | null;
-    [index: number]: Element;
-}
-
-declare var HTMLAllCollection: {
-    prototype: HTMLAllCollection;
-    new(): HTMLAllCollection;
-};
-
-interface HTMLAnchorElement extends HTMLElement, HTMLHyperlinkElementUtils {
-    Methods: string;
-    /**
-     * Sets or retrieves the character set used to encode the object.
-     */
-    /** @deprecated */
-    charset: string;
-    /**
-     * Sets or retrieves the coordinates of the object.
-     */
-    /** @deprecated */
-    coords: string;
-    download: string;
-    /**
-     * Sets or retrieves the language code of the object.
-     */
-    hreflang: string;
-    readonly mimeType: string;
-    /**
-     * Sets or retrieves the shape of the object.
-     */
-    /** @deprecated */
-    name: string;
-    readonly nameProp: string;
-    readonly protocolLong: string;
-    /**
-     * Sets or retrieves the relationship between the object and the destination of the link.
-     */
-    rel: string;
-    /**
-     * Sets or retrieves the relationship between the object and the destination of the link.
-     */
-    /** @deprecated */
-    rev: string;
-    /**
-     * Sets or retrieves the shape of the object.
-     */
-    /** @deprecated */
-    shape: string;
-    /**
-     * Sets or retrieves the window or frame at which to target content.
-     */
-    target: string;
-    /**
-     * Retrieves or sets the text of the object as a string.
-     */
-    text: string;
-    type: string;
-    urn: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLAnchorElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLAnchorElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLAnchorElement: {
-    prototype: HTMLAnchorElement;
-    new(): HTMLAnchorElement;
-};
-
-interface HTMLAppletElement extends HTMLElement {
-    /** @deprecated */
-    align: string;
-    /**
-     * Sets or retrieves a text alternative to the graphic.
-     */
-    /** @deprecated */
-    alt: string;
-    /**
-     * Sets or retrieves a character string that can be used to implement your own archive functionality for the object.
-     */
-    /** @deprecated */
-    archive: string;
-    /** @deprecated */
-    code: string;
-    /**
-     * Sets or retrieves the URL of the component.
-     */
-    /** @deprecated */
-    codeBase: string;
-    readonly form: HTMLFormElement | null;
-    /**
-     * Sets or retrieves the height of the object.
-     */
-    /** @deprecated */
-    height: string;
-    /** @deprecated */
-    hspace: number;
-    /**
-     * Sets or retrieves the shape of the object.
-     */
-    /** @deprecated */
-    name: string;
-    /** @deprecated */
-    object: string;
-    /** @deprecated */
-    vspace: number;
-    /** @deprecated */
-    width: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLAppletElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLAppletElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLAppletElement: {
-    prototype: HTMLAppletElement;
-    new(): HTMLAppletElement;
-};
-
-interface HTMLAreaElement extends HTMLElement, HTMLHyperlinkElementUtils {
-    /**
-     * Sets or retrieves a text alternative to the graphic.
-     */
-    alt: string;
-    /**
-     * Sets or retrieves the coordinates of the object.
-     */
-    coords: string;
-    download: string;
-    /**
-     * Sets or gets whether clicks in this region cause action.
-     */
-    /** @deprecated */
-    noHref: boolean;
-    rel: string;
-    /**
-     * Sets or retrieves the shape of the object.
-     */
-    shape: string;
-    /**
-     * Sets or retrieves the window or frame at which to target content.
-     */
-    target: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLAreaElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLAreaElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLAreaElement: {
-    prototype: HTMLAreaElement;
-    new(): HTMLAreaElement;
-};
-
-interface HTMLAreasCollection extends HTMLCollectionBase {
-}
-
-declare var HTMLAreasCollection: {
-    prototype: HTMLAreasCollection;
-    new(): HTMLAreasCollection;
-};
-
-interface HTMLAudioElement extends HTMLMediaElement {
-    addEventListener<K extends keyof HTMLMediaElementEventMap>(type: K, listener: (this: HTMLAudioElement, ev: HTMLMediaElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLMediaElementEventMap>(type: K, listener: (this: HTMLAudioElement, ev: HTMLMediaElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLAudioElement: {
-    prototype: HTMLAudioElement;
-    new(): HTMLAudioElement;
-};
-
-interface HTMLBRElement extends HTMLElement {
-    /**
-     * Sets or retrieves the side on which floating objects are not to be positioned when any IHTMLBlockElement is inserted into the document.
-     */
-    /** @deprecated */
-    clear: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLBRElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLBRElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLBRElement: {
-    prototype: HTMLBRElement;
-    new(): HTMLBRElement;
-};
-
-interface HTMLBaseElement extends HTMLElement {
-    /**
-     * Gets or sets the baseline URL on which relative links are based.
-     */
-    href: string;
-    /**
-     * Sets or retrieves the window or frame at which to target content.
-     */
-    target: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLBaseElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLBaseElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLBaseElement: {
-    prototype: HTMLBaseElement;
-    new(): HTMLBaseElement;
-};
-
-interface HTMLBaseFontElement extends HTMLElement, DOML2DeprecatedColorProperty {
-    /**
-     * Sets or retrieves the current typeface family.
-     */
-    /** @deprecated */
-    face: string;
-    /**
-     * Sets or retrieves the font size of the object.
-     */
-    /** @deprecated */
-    size: number;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLBaseFontElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLBaseFontElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLBaseFontElement: {
-    prototype: HTMLBaseFontElement;
-    new(): HTMLBaseFontElement;
-};
-
-interface HTMLBodyElementEventMap extends HTMLElementEventMap, WindowEventHandlersEventMap {
-    "blur": FocusEvent;
-    "error": ErrorEvent;
-    "focus": FocusEvent;
-    "load": Event;
-    "orientationchange": Event;
-    "resize": UIEvent;
-    "scroll": UIEvent;
-}
-
-interface HTMLBodyElement extends HTMLElement, WindowEventHandlers {
-    /** @deprecated */
-    aLink: string;
-    /** @deprecated */
-    background: string;
-    /** @deprecated */
-    bgColor: string;
-    bgProperties: string;
-    /** @deprecated */
-    link: string;
-    /** @deprecated */
-    noWrap: boolean;
-    onorientationchange: ((this: HTMLBodyElement, ev: Event) => any) | null;
-    onresize: ((this: HTMLBodyElement, ev: UIEvent) => any) | null;
-    /** @deprecated */
-    text: string;
-    /** @deprecated */
-    vLink: string;
-    addEventListener<K extends keyof HTMLBodyElementEventMap>(type: K, listener: (this: HTMLBodyElement, ev: HTMLBodyElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLBodyElementEventMap>(type: K, listener: (this: HTMLBodyElement, ev: HTMLBodyElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLBodyElement: {
-    prototype: HTMLBodyElement;
-    new(): HTMLBodyElement;
-};
-
-interface HTMLButtonElement extends HTMLElement {
-    /**
-     * Provides a way to direct a user to a specific field when a document loads. This can provide both direction and convenience for a user, reducing the need to click or tab to a field when a page opens. This attribute is true when present on an element, and false when missing.
-     */
-    autofocus: boolean;
-    disabled: boolean;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Overrides the action attribute (where the data on a form is sent) on the parent form element.
-     */
-    formAction: string;
-    /**
-     * Used to override the encoding (formEnctype attribute) specified on the form element.
-     */
-    formEnctype: string;
-    /**
-     * Overrides the submit method attribute previously specified on a form element.
-     */
-    formMethod: string;
-    /**
-     * Overrides any validation or required attributes on a form or form elements to allow it to be submitted without validation. This can be used to create a "save draft"-type submit option.
-     */
-    formNoValidate: boolean;
-    /**
-     * Overrides the target attribute on a form element.
-     */
-    formTarget: string;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    name: string;
-    status: any;
-    /**
-     * Gets the classification and default behavior of the button.
-     */
-    type: string;
-    /**
-     * Returns the error message that would be displayed if the user submits the form, or an empty string if no error message. It also triggers the standard error message, such as "this is a required field". The result is that the user sees validation messages without actually submitting.
-     */
-    readonly validationMessage: string;
-    /**
-     * Returns a  ValidityState object that represents the validity states of an element.
-     */
-    readonly validity: ValidityState;
-    /**
-     * Sets or retrieves the default or selected value of the control.
-     */
-    value: string;
-    /**
-     * Returns whether an element will successfully validate based on forms validation rules and constraints.
-     */
-    readonly willValidate: boolean;
-    /**
-     * Returns whether a form will validate when it is submitted, without having to submit it.
-     */
-    checkValidity(): boolean;
-    /**
-     * Sets a custom error message that is displayed when a form is submitted.
-     * @param error Sets a custom error message that is displayed when a form is submitted.
-     */
-    setCustomValidity(error: string): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLButtonElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLButtonElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLButtonElement: {
-    prototype: HTMLButtonElement;
-    new(): HTMLButtonElement;
-};
-
-interface HTMLCanvasElement extends HTMLElement {
-    /**
-     * Gets or sets the height of a canvas element on a document.
-     */
-    height: number;
-    /**
-     * Gets or sets the width of a canvas element on a document.
-     */
-    width: number;
-    /**
-     * Returns an object that provides methods and properties for drawing and manipulating images and graphics on a canvas element in a document. A context object includes information about colors, line widths, fonts, and other graphic parameters that can be drawn on a canvas.
-     * @param contextId The identifier (ID) of the type of canvas to create. Internet Explorer 9 and Internet Explorer 10 support only a 2-D context using canvas.getContext("2d"); IE11 Preview also supports 3-D or WebGL context using canvas.getContext("experimental-webgl");
-     */
-    getContext(contextId: "2d", contextAttributes?: Canvas2DContextAttributes): CanvasRenderingContext2D | null;
-    getContext(contextId: "webgl" | "experimental-webgl", contextAttributes?: WebGLContextAttributes): WebGLRenderingContext | null;
-    getContext(contextId: string, contextAttributes?: {}): CanvasRenderingContext2D | WebGLRenderingContext | null;
-    /**
-     * Returns a blob object encoded as a Portable Network Graphics (PNG) format from a canvas image or drawing.
-     */
-    msToBlob(): Blob;
-    toBlob(callback: (result: Blob | null) => void, type?: string, ...arguments: any[]): void;
-    /**
-     * Returns the content of the current canvas as an image that you can use as a source for another canvas or an HTML element.
-     * @param type The standard MIME type for the image format to return. If you do not specify this parameter, the default value is a PNG format image.
-     */
-    toDataURL(type?: string, ...args: any[]): string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLCanvasElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLCanvasElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLCanvasElement: {
-    prototype: HTMLCanvasElement;
-    new(): HTMLCanvasElement;
-};
-
-interface HTMLCollectionBase {
-    /**
-     * Sets or retrieves the number of objects in a collection.
-     */
-    readonly length: number;
-    /**
-     * Retrieves an object from various collections.
-     */
-    item(index: number): Element;
-    [index: number]: Element;
-}
-
-interface HTMLCollection extends HTMLCollectionBase {
-    /**
-     * Retrieves a select object or an object from an options collection.
-     */
-    namedItem(name: string): Element | null;
-}
-
-declare var HTMLCollection: {
-    prototype: HTMLCollection;
-    new(): HTMLCollection;
-};
-
-interface HTMLCollectionOf<T extends Element> extends HTMLCollectionBase {
-    item(index: number): T;
-    namedItem(name: string): T;
-    [index: number]: T;
-}
-
-interface HTMLDListElement extends HTMLElement {
-    /** @deprecated */
-    compact: boolean;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDListElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDListElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLDListElement: {
-    prototype: HTMLDListElement;
-    new(): HTMLDListElement;
-};
-
-interface HTMLDataElement extends HTMLElement {
-    value: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDataElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDataElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLDataElement: {
-    prototype: HTMLDataElement;
-    new(): HTMLDataElement;
-};
-
-interface HTMLDataListElement extends HTMLElement {
-    readonly options: HTMLCollectionOf<HTMLOptionElement>;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDataListElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDataListElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLDataListElement: {
-    prototype: HTMLDataListElement;
-    new(): HTMLDataListElement;
-};
-
-interface HTMLDetailsElement extends HTMLElement {
-    open: boolean;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDetailsElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDetailsElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLDetailsElement: {
-    prototype: HTMLDetailsElement;
-    new(): HTMLDetailsElement;
-};
-
-interface HTMLDialogElement extends HTMLElement {
-    open: boolean;
-    returnValue: string;
-    close(returnValue?: string): void;
-    show(): void;
-    showModal(): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDialogElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDialogElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLDialogElement: {
-    prototype: HTMLDialogElement;
-    new(): HTMLDialogElement;
-};
-
-interface HTMLDirectoryElement extends HTMLElement {
-    compact: boolean;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDirectoryElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDirectoryElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLDirectoryElement: {
-    prototype: HTMLDirectoryElement;
-    new(): HTMLDirectoryElement;
-};
-
-interface HTMLDivElement extends HTMLElement {
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    /** @deprecated */
-    align: string;
-    /**
-     * Sets or retrieves whether the browser automatically performs wordwrap.
-     */
-    noWrap: boolean;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDivElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDivElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLDivElement: {
-    prototype: HTMLDivElement;
-    new(): HTMLDivElement;
-};
-
-interface HTMLDocument extends Document {
-    addEventListener<K extends keyof DocumentEventMap>(type: K, listener: (this: HTMLDocument, ev: DocumentEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof DocumentEventMap>(type: K, listener: (this: HTMLDocument, ev: DocumentEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLDocument: {
-    prototype: HTMLDocument;
-    new(): HTMLDocument;
-};
-
-interface HTMLElementEventMap extends ElementEventMap {
-    "abort": UIEvent;
-    "activate": Event;
-    "beforeactivate": Event;
-    "beforecopy": Event;
-    "beforecut": Event;
-    "beforedeactivate": Event;
-    "beforepaste": Event;
-    "blur": FocusEvent;
-    "canplay": Event;
-    "canplaythrough": Event;
-    "change": Event;
-    "click": MouseEvent;
-    "contextmenu": PointerEvent;
-    "copy": ClipboardEvent;
-    "cuechange": Event;
-    "cut": ClipboardEvent;
-    "dblclick": MouseEvent;
-    "deactivate": Event;
-    "drag": DragEvent;
-    "dragend": DragEvent;
-    "dragenter": DragEvent;
-    "dragleave": DragEvent;
-    "dragover": DragEvent;
-    "dragstart": DragEvent;
-    "drop": DragEvent;
-    "durationchange": Event;
-    "emptied": Event;
-    "ended": Event;
-    "error": ErrorEvent;
-    "focus": FocusEvent;
-    "input": Event;
-    "invalid": Event;
-    "keydown": KeyboardEvent;
-    "keypress": KeyboardEvent;
-    "keyup": KeyboardEvent;
-    "load": Event;
-    "loadeddata": Event;
-    "loadedmetadata": Event;
-    "loadstart": Event;
-    "mousedown": MouseEvent;
-    "mouseenter": MouseEvent;
-    "mouseleave": MouseEvent;
-    "mousemove": MouseEvent;
-    "mouseout": MouseEvent;
-    "mouseover": MouseEvent;
-    "mouseup": MouseEvent;
-    "mousewheel": WheelEvent;
-    "MSContentZoom": Event;
-    "MSManipulationStateChanged": Event;
-    "paste": ClipboardEvent;
-    "pause": Event;
-    "play": Event;
-    "playing": Event;
-    "progress": ProgressEvent;
-    "ratechange": Event;
-    "reset": Event;
-    "scroll": UIEvent;
-    "seeked": Event;
-    "seeking": Event;
-    "select": UIEvent;
-    "selectstart": Event;
-    "stalled": Event;
-    "submit": Event;
-    "suspend": Event;
-    "timeupdate": Event;
-    "volumechange": Event;
-    "waiting": Event;
-}
-
-interface HTMLElement extends Element, ElementCSSInlineStyle {
-    accessKey: string;
-    contentEditable: string;
-    readonly dataset: DOMStringMap;
-    dir: string;
-    draggable: boolean;
-    hidden: boolean;
-    hideFocus: boolean;
-    innerText: string;
-    readonly isContentEditable: boolean;
-    lang: string;
-    readonly offsetHeight: number;
-    readonly offsetLeft: number;
-    readonly offsetParent: Element;
-    readonly offsetTop: number;
-    readonly offsetWidth: number;
-    onabort: ((this: HTMLElement, ev: UIEvent) => any) | null;
-    onactivate: ((this: HTMLElement, ev: Event) => any) | null;
-    onbeforeactivate: ((this: HTMLElement, ev: Event) => any) | null;
-    onbeforecopy: ((this: HTMLElement, ev: Event) => any) | null;
-    onbeforecut: ((this: HTMLElement, ev: Event) => any) | null;
-    onbeforedeactivate: ((this: HTMLElement, ev: Event) => any) | null;
-    onbeforepaste: ((this: HTMLElement, ev: Event) => any) | null;
-    onblur: ((this: HTMLElement, ev: FocusEvent) => any) | null;
-    oncanplay: ((this: HTMLElement, ev: Event) => any) | null;
-    oncanplaythrough: ((this: HTMLElement, ev: Event) => any) | null;
-    onchange: ((this: HTMLElement, ev: Event) => any) | null;
-    onclick: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    oncontextmenu: ((this: HTMLElement, ev: PointerEvent) => any) | null;
-    oncopy: ((this: HTMLElement, ev: ClipboardEvent) => any) | null;
-    oncuechange: ((this: HTMLElement, ev: Event) => any) | null;
-    oncut: ((this: HTMLElement, ev: ClipboardEvent) => any) | null;
-    ondblclick: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    ondeactivate: ((this: HTMLElement, ev: Event) => any) | null;
-    ondrag: ((this: HTMLElement, ev: DragEvent) => any) | null;
-    ondragend: ((this: HTMLElement, ev: DragEvent) => any) | null;
-    ondragenter: ((this: HTMLElement, ev: DragEvent) => any) | null;
-    ondragleave: ((this: HTMLElement, ev: DragEvent) => any) | null;
-    ondragover: ((this: HTMLElement, ev: DragEvent) => any) | null;
-    ondragstart: ((this: HTMLElement, ev: DragEvent) => any) | null;
-    ondrop: ((this: HTMLElement, ev: DragEvent) => any) | null;
-    ondurationchange: ((this: HTMLElement, ev: Event) => any) | null;
-    onemptied: ((this: HTMLElement, ev: Event) => any) | null;
-    onended: ((this: HTMLElement, ev: Event) => any) | null;
-    onerror: ((this: HTMLElement, ev: ErrorEvent) => any) | null;
-    onfocus: ((this: HTMLElement, ev: FocusEvent) => any) | null;
-    oninput: ((this: HTMLElement, ev: Event) => any) | null;
-    oninvalid: ((this: HTMLElement, ev: Event) => any) | null;
-    onkeydown: ((this: HTMLElement, ev: KeyboardEvent) => any) | null;
-    onkeypress: ((this: HTMLElement, ev: KeyboardEvent) => any) | null;
-    onkeyup: ((this: HTMLElement, ev: KeyboardEvent) => any) | null;
-    onload: ((this: HTMLElement, ev: Event) => any) | null;
-    onloadeddata: ((this: HTMLElement, ev: Event) => any) | null;
-    onloadedmetadata: ((this: HTMLElement, ev: Event) => any) | null;
-    onloadstart: ((this: HTMLElement, ev: Event) => any) | null;
-    onmousedown: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    onmouseenter: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    onmouseleave: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    onmousemove: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    onmouseout: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    onmouseover: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    onmouseup: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    onmousewheel: ((this: HTMLElement, ev: WheelEvent) => any) | null;
-    onmscontentzoom: ((this: HTMLElement, ev: Event) => any) | null;
-    onmsmanipulationstatechanged: ((this: HTMLElement, ev: Event) => any) | null;
-    onpaste: ((this: HTMLElement, ev: ClipboardEvent) => any) | null;
-    onpause: ((this: HTMLElement, ev: Event) => any) | null;
-    onplay: ((this: HTMLElement, ev: Event) => any) | null;
-    onplaying: ((this: HTMLElement, ev: Event) => any) | null;
-    onprogress: ((this: HTMLElement, ev: ProgressEvent) => any) | null;
-    onratechange: ((this: HTMLElement, ev: Event) => any) | null;
-    onreset: ((this: HTMLElement, ev: Event) => any) | null;
-    onscroll: ((this: HTMLElement, ev: UIEvent) => any) | null;
-    onseeked: ((this: HTMLElement, ev: Event) => any) | null;
-    onseeking: ((this: HTMLElement, ev: Event) => any) | null;
-    onselect: ((this: HTMLElement, ev: UIEvent) => any) | null;
-    onselectstart: ((this: HTMLElement, ev: Event) => any) | null;
-    onstalled: ((this: HTMLElement, ev: Event) => any) | null;
-    onsubmit: ((this: HTMLElement, ev: Event) => any) | null;
-    onsuspend: ((this: HTMLElement, ev: Event) => any) | null;
-    ontimeupdate: ((this: HTMLElement, ev: Event) => any) | null;
-    onvolumechange: ((this: HTMLElement, ev: Event) => any) | null;
-    onwaiting: ((this: HTMLElement, ev: Event) => any) | null;
-    outerText: string;
-    spellcheck: boolean;
-    tabIndex: number;
-    title: string;
-    animate(keyframes: AnimationKeyFrame | AnimationKeyFrame[], options: number | AnimationOptions): Animation;
-    blur(): void;
-    click(): void;
-    dragDrop(): boolean;
-    focus(): void;
-    msGetInputContext(): MSInputMethodContext;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLElement: {
-    prototype: HTMLElement;
-    new(): HTMLElement;
-};
-
-interface HTMLEmbedElement extends HTMLElement, GetSVGDocument {
-    /**
-     * Sets or retrieves the height of the object.
-     */
-    height: string;
-    hidden: any;
-    /**
-     * Gets or sets whether the DLNA PlayTo device is available.
-     */
-    msPlayToDisabled: boolean;
-    /**
-     * Gets or sets the path to the preferred media source. This enables the Play To target device to stream the media content, which can be DRM protected, from a different location, such as a cloud media server.
-     */
-    msPlayToPreferredSourceUri: string;
-    /**
-     * Gets or sets the primary DLNA PlayTo device.
-     */
-    msPlayToPrimary: boolean;
-    /**
-     * Gets the source associated with the media element for use by the PlayToManager.
-     */
-    readonly msPlayToSource: any;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    /** @deprecated */
-    name: string;
-    /**
-     * Retrieves the palette used for the embedded document.
-     */
-    readonly palette: string;
-    /**
-     * Retrieves the URL of the plug-in used to view an embedded document.
-     */
-    readonly pluginspage: string;
-    readonly readyState: string;
-    /**
-     * Sets or retrieves a URL to be loaded by the object.
-     */
-    src: string;
-    /**
-     * Sets or retrieves the height and width units of the embed object.
-     */
-    units: string;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    width: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLEmbedElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLEmbedElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLEmbedElement: {
-    prototype: HTMLEmbedElement;
-    new(): HTMLEmbedElement;
-};
-
-interface HTMLFieldSetElement extends HTMLElement {
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    align: string;
-    disabled: boolean;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    name: string;
-    /**
-     * Returns the error message that would be displayed if the user submits the form, or an empty string if no error message. It also triggers the standard error message, such as "this is a required field". The result is that the user sees validation messages without actually submitting.
-     */
-    readonly validationMessage: string;
-    /**
-     * Returns a  ValidityState object that represents the validity states of an element.
-     */
-    readonly validity: ValidityState;
-    /**
-     * Returns whether an element will successfully validate based on forms validation rules and constraints.
-     */
-    readonly willValidate: boolean;
-    /**
-     * Returns whether a form will validate when it is submitted, without having to submit it.
-     */
-    checkValidity(): boolean;
-    /**
-     * Sets a custom error message that is displayed when a form is submitted.
-     * @param error Sets a custom error message that is displayed when a form is submitted.
-     */
-    setCustomValidity(error: string): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLFieldSetElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLFieldSetElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLFieldSetElement: {
-    prototype: HTMLFieldSetElement;
-    new(): HTMLFieldSetElement;
-};
-
-interface HTMLFontElement extends HTMLElement, DOML2DeprecatedColorProperty, DOML2DeprecatedSizeProperty {
-    /**
-     * Sets or retrieves the current typeface family.
-     */
-    /** @deprecated */
-    face: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLFontElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLFontElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLFontElement: {
-    prototype: HTMLFontElement;
-    new(): HTMLFontElement;
-};
-
-interface HTMLFormControlsCollection extends HTMLCollectionBase {
-    namedItem(name: string): HTMLCollection | Element | null;
-}
-
-declare var HTMLFormControlsCollection: {
-    prototype: HTMLFormControlsCollection;
-    new(): HTMLFormControlsCollection;
-};
-
-interface HTMLFormElement extends HTMLElement {
-    /**
-     * Sets or retrieves a list of character encodings for input data that must be accepted by the server processing the form.
-     */
-    acceptCharset: string;
-    /**
-     * Sets or retrieves the URL to which the form content is sent for processing.
-     */
-    action: string;
-    /**
-     * Specifies whether autocomplete is applied to an editable text field.
-     */
-    autocomplete: string;
-    /**
-     * Retrieves a collection, in source order, of all controls in a given form.
-     */
-    readonly elements: HTMLFormControlsCollection;
-    /**
-     * Sets or retrieves the MIME encoding for the form.
-     */
-    encoding: string;
-    /**
-     * Sets or retrieves the encoding type for the form.
-     */
-    enctype: string;
-    /**
-     * Sets or retrieves the number of objects in a collection.
-     */
-    readonly length: number;
-    /**
-     * Sets or retrieves how to send the form data to the server.
-     */
-    method: string;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    name: string;
-    /**
-     * Designates a form that is not validated when submitted.
-     */
-    noValidate: boolean;
-    /**
-     * Sets or retrieves the window or frame at which to target content.
-     */
-    target: string;
-    /**
-     * Returns whether a form will validate when it is submitted, without having to submit it.
-     */
-    checkValidity(): boolean;
-    /**
-     * Retrieves a form object or an object from an elements collection.
-     * @param name Variant of type Number or String that specifies the object or collection to retrieve. If this parameter is a Number, it is the zero-based index of the object. If this parameter is a string, all objects with matching name or id properties are retrieved, and a collection is returned if more than one match is made.
-     * @param index Variant of type Number that specifies the zero-based index of the object to retrieve when a collection is returned.
-     */
-    item(name?: any, index?: any): any;
-    /**
-     * Retrieves a form object or an object from an elements collection.
-     */
-    namedItem(name: string): any;
-    reportValidity(): boolean;
-    /**
-     * Fires when the user resets a form.
-     */
-    reset(): void;
-    /**
-     * Fires when a FORM is about to be submitted.
-     */
-    submit(): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLFormElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLFormElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-    [name: string]: any;
-}
-
-declare var HTMLFormElement: {
-    prototype: HTMLFormElement;
-    new(): HTMLFormElement;
-};
-
-interface HTMLFrameElementEventMap extends HTMLElementEventMap {
-    "load": Event;
-}
-
-interface HTMLFrameElement extends HTMLElement, GetSVGDocument {
-    /**
-     * Specifies the properties of a border drawn around an object.
-     */
-    border: string;
-    /**
-     * Sets or retrieves the border color of the object.
-     */
-    borderColor: any;
-    /**
-     * Retrieves the document object of the page or frame.
-     */
-    /** @deprecated */
-    readonly contentDocument: Document | null;
-    /**
-     * Retrieves the object of the specified.
-     */
-    /** @deprecated */
-    readonly contentWindow: Window | null;
-    /**
-     * Sets or retrieves whether to display a border for the frame.
-     */
-    /** @deprecated */
-    frameBorder: string;
-    /**
-     * Sets or retrieves the amount of additional space between the frames.
-     */
-    frameSpacing: any;
-    /**
-     * Sets or retrieves the height of the object.
-     */
-    height: string | number;
-    /**
-     * Sets or retrieves a URI to a long description of the object.
-     */
-    /** @deprecated */
-    longDesc: string;
-    /**
-     * Sets or retrieves the top and bottom margin heights before displaying the text in a frame.
-     */
-    /** @deprecated */
-    marginHeight: string;
-    /**
-     * Sets or retrieves the left and right margin widths before displaying the text in a frame.
-     */
-    /** @deprecated */
-    marginWidth: string;
-    /**
-     * Sets or retrieves the frame name.
-     */
-    /** @deprecated */
-    name: string;
-    /**
-     * Sets or retrieves whether the user can resize the frame.
-     */
-    /** @deprecated */
-    noResize: boolean;
-    /**
-     * Sets or retrieves whether the frame can be scrolled.
-     */
-    /** @deprecated */
-    scrolling: string;
-    /**
-     * Sets or retrieves a URL to be loaded by the object.
-     */
-    /** @deprecated */
-    src: string;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    width: string | number;
-    addEventListener<K extends keyof HTMLFrameElementEventMap>(type: K, listener: (this: HTMLFrameElement, ev: HTMLFrameElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLFrameElementEventMap>(type: K, listener: (this: HTMLFrameElement, ev: HTMLFrameElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLFrameElement: {
-    prototype: HTMLFrameElement;
-    new(): HTMLFrameElement;
-};
-
-interface HTMLFrameSetElementEventMap extends HTMLElementEventMap, WindowEventHandlersEventMap {
-    "blur": FocusEvent;
-    "error": ErrorEvent;
-    "focus": FocusEvent;
-    "load": Event;
-    "orientationchange": Event;
-    "resize": UIEvent;
-    "scroll": UIEvent;
-}
-
-interface HTMLFrameSetElement extends HTMLElement, WindowEventHandlers {
-    /**
-     * Sets or retrieves the frame widths of the object.
-     */
-    /** @deprecated */
-    cols: string;
-    name: string;
-    onorientationchange: ((this: HTMLFrameSetElement, ev: Event) => any) | null;
-    onresize: ((this: HTMLFrameSetElement, ev: UIEvent) => any) | null;
-    /**
-     * Sets or retrieves the frame heights of the object.
-     */
-    /** @deprecated */
-    rows: string;
-    addEventListener<K extends keyof HTMLFrameSetElementEventMap>(type: K, listener: (this: HTMLFrameSetElement, ev: HTMLFrameSetElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLFrameSetElementEventMap>(type: K, listener: (this: HTMLFrameSetElement, ev: HTMLFrameSetElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLFrameSetElement: {
-    prototype: HTMLFrameSetElement;
-    new(): HTMLFrameSetElement;
-};
-
-interface HTMLHRElement extends HTMLElement, DOML2DeprecatedColorProperty, DOML2DeprecatedSizeProperty {
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    /** @deprecated */
-    align: string;
-    /**
-     * Sets or retrieves whether the horizontal rule is drawn with 3-D shading.
-     */
-    /** @deprecated */
-    noShade: boolean;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    /** @deprecated */
-    width: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLHRElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLHRElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLHRElement: {
-    prototype: HTMLHRElement;
-    new(): HTMLHRElement;
-};
-
-interface HTMLHeadElement extends HTMLElement {
-    /** @deprecated */
-    profile: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLHeadElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLHeadElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLHeadElement: {
-    prototype: HTMLHeadElement;
-    new(): HTMLHeadElement;
-};
-
-interface HTMLHeadingElement extends HTMLElement {
-    /**
-     * Sets or retrieves a value that indicates the table alignment.
-     */
-    /** @deprecated */
-    align: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLHeadingElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLHeadingElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLHeadingElement: {
-    prototype: HTMLHeadingElement;
-    new(): HTMLHeadingElement;
-};
-
-interface HTMLHtmlElement extends HTMLElement {
-    /**
-     * Sets or retrieves the DTD version that governs the current document.
-     */
-    /** @deprecated */
-    version: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLHtmlElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLHtmlElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLHtmlElement: {
-    prototype: HTMLHtmlElement;
-    new(): HTMLHtmlElement;
-};
-
-interface HTMLHyperlinkElementUtils {
-    hash: string;
-    host: string;
-    hostname: string;
-    href: string;
-    origin: string;
-    pathname: string;
-    port: string;
-    protocol: string;
-    search: string;
-    toString(): string;
-}
-
-interface HTMLIFrameElementEventMap extends HTMLElementEventMap {
-    "load": Event;
-}
-
-interface HTMLIFrameElement extends HTMLElement, GetSVGDocument {
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    /** @deprecated */
-    align: string;
-    allowFullscreen: boolean;
-    allowPaymentRequest: boolean;
-    /**
-     * Retrieves the document object of the page or frame.
-     */
-    readonly contentDocument: Document | null;
-    /**
-     * Retrieves the object of the specified.
-     */
-    readonly contentWindow: Window | null;
-    /**
-     * Sets or retrieves whether to display a border for the frame.
-     */
-    /** @deprecated */
-    frameBorder: string;
-    /**
-     * Sets or retrieves the height of the object.
-     */
-    height: string;
-    /**
-     * Sets or retrieves a URI to a long description of the object.
-     */
-    /** @deprecated */
-    longDesc: string;
-    /**
-     * Sets or retrieves the top and bottom margin heights before displaying the text in a frame.
-     */
-    /** @deprecated */
-    marginHeight: string;
-    /**
-     * Sets or retrieves the left and right margin widths before displaying the text in a frame.
-     */
-    /** @deprecated */
-    marginWidth: string;
-    /**
-     * Sets or retrieves the frame name.
-     */
-    name: string;
-    readonly sandbox: DOMTokenList;
-    /**
-     * Sets or retrieves whether the frame can be scrolled.
-     */
-    /** @deprecated */
-    scrolling: string;
-    /**
-     * Sets or retrieves a URL to be loaded by the object.
-     */
-    src: string;
-    /**
-     * Sets or retrives the content of the page that is to contain.
-     */
-    srcdoc: string;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    width: string;
-    addEventListener<K extends keyof HTMLIFrameElementEventMap>(type: K, listener: (this: HTMLIFrameElement, ev: HTMLIFrameElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLIFrameElementEventMap>(type: K, listener: (this: HTMLIFrameElement, ev: HTMLIFrameElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLIFrameElement: {
-    prototype: HTMLIFrameElement;
-    new(): HTMLIFrameElement;
-};
-
-interface HTMLImageElement extends HTMLElement {
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    /** @deprecated */
-    align: string;
-    /**
-     * Sets or retrieves a text alternative to the graphic.
-     */
-    alt: string;
-    /**
-     * Specifies the properties of a border drawn around an object.
-     */
-    /** @deprecated */
-    border: string;
-    /**
-     * Retrieves whether the object is fully loaded.
-     */
-    readonly complete: boolean;
-    crossOrigin: string | null;
-    readonly currentSrc: string;
-    decoding: "async" | "sync" | "auto";
-    /**
-     * Sets or retrieves the height of the object.
-     */
-    height: number;
-    /**
-     * Sets or retrieves the width of the border to draw around the object.
-     */
-    /** @deprecated */
-    hspace: number;
-    /**
-     * Sets or retrieves whether the image is a server-side image map.
-     */
-    isMap: boolean;
-    /**
-     * Sets or retrieves a Uniform Resource Identifier (URI) to a long description of the object.
-     */
-    longDesc: string;
-    /** @deprecated */
-    lowsrc: string;
-    /**
-     * Gets or sets whether the DLNA PlayTo device is available.
-     */
-    msPlayToDisabled: boolean;
-    msPlayToPreferredSourceUri: string;
-    /**
-     * Gets or sets the primary DLNA PlayTo device.
-     */
-    msPlayToPrimary: boolean;
-    /**
-     * Gets the source associated with the media element for use by the PlayToManager.
-     */
-    readonly msPlayToSource: any;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    /** @deprecated */
-    name: string;
-    /**
-     * The original height of the image resource before sizing.
-     */
-    readonly naturalHeight: number;
-    /**
-     * The original width of the image resource before sizing.
-     */
-    readonly naturalWidth: number;
-    sizes: string;
-    /**
-     * The address or URL of the a media resource that is to be considered.
-     */
-    src: string;
-    srcset: string;
-    /**
-     * Sets or retrieves the URL, often with a bookmark extension (#name), to use as a client-side image map.
-     */
-    useMap: string;
-    /**
-     * Sets or retrieves the vertical margin for the object.
-     */
-    /** @deprecated */
-    vspace: number;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    width: number;
-    readonly x: number;
-    readonly y: number;
-    msGetAsCastingSource(): any;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLImageElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLImageElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLImageElement: {
-    prototype: HTMLImageElement;
-    new(): HTMLImageElement;
-};
-
-interface HTMLInputElement extends HTMLElement {
-    /**
-     * Sets or retrieves a comma-separated list of content types.
-     */
-    accept: string;
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    /** @deprecated */
-    align: string;
-    /**
-     * Sets or retrieves a text alternative to the graphic.
-     */
-    alt: string;
-    /**
-     * Specifies whether autocomplete is applied to an editable text field.
-     */
-    autocomplete: string;
-    /**
-     * Provides a way to direct a user to a specific field when a document loads. This can provide both direction and convenience for a user, reducing the need to click or tab to a field when a page opens. This attribute is true when present on an element, and false when missing.
-     */
-    autofocus: boolean;
-    /**
-     * Sets or retrieves the state of the check box or radio button.
-     */
-    checked: boolean;
-    /**
-     * Sets or retrieves the state of the check box or radio button.
-     */
-    defaultChecked: boolean;
-    /**
-     * Sets or retrieves the initial contents of the object.
-     */
-    defaultValue: string;
-    disabled: boolean;
-    /**
-     * Returns a FileList object on a file type input object.
-     */
-    files: FileList | null;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Overrides the action attribute (where the data on a form is sent) on the parent form element.
-     */
-    formAction: string;
-    /**
-     * Used to override the encoding (formEnctype attribute) specified on the form element.
-     */
-    formEnctype: string;
-    /**
-     * Overrides the submit method attribute previously specified on a form element.
-     */
-    formMethod: string;
-    /**
-     * Overrides any validation or required attributes on a form or form elements to allow it to be submitted without validation. This can be used to create a "save draft"-type submit option.
-     */
-    formNoValidate: boolean;
-    /**
-     * Overrides the target attribute on a form element.
-     */
-    formTarget: string;
-    /**
-     * Sets or retrieves the height of the object.
-     */
-    height: number;
-    indeterminate: boolean;
-    /**
-     * Specifies the ID of a pre-defined datalist of options for an input element.
-     */
-    readonly list: HTMLElement | null;
-    /**
-     * Defines the maximum acceptable value for an input element with type="number".When used with the min and step attributes, lets you control the range and increment (such as only even numbers) that the user can enter into an input field.
-     */
-    max: string;
-    /**
-     * Sets or retrieves the maximum number of characters that the user can enter in a text control.
-     */
-    maxLength: number;
-    /**
-     * Defines the minimum acceptable value for an input element with type="number". When used with the max and step attributes, lets you control the range and increment (such as even numbers only) that the user can enter into an input field.
-     */
-    min: string;
-    minLength: number;
-    /**
-     * Sets or retrieves the Boolean value indicating whether multiple items can be selected from a list.
-     */
-    multiple: boolean;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    name: string;
-    /**
-     * Gets or sets a string containing a regular expression that the user's input must match.
-     */
-    pattern: string;
-    /**
-     * Gets or sets a text string that is displayed in an input field as a hint or prompt to users as the format or type of information they need to enter.The text appears in an input field until the user puts focus on the field.
-     */
-    placeholder: string;
-    readOnly: boolean;
-    /**
-     * When present, marks an element that can't be submitted without a value.
-     */
-    required: boolean;
-    selectionDirection: string | null;
-    /**
-     * Gets or sets the end position or offset of a text selection.
-     */
-    selectionEnd: number | null;
-    /**
-     * Gets or sets the starting position or offset of a text selection.
-     */
-    selectionStart: number | null;
-    size: number;
-    /**
-     * The address or URL of the a media resource that is to be considered.
-     */
-    src: string;
-    /**
-     * Defines an increment or jump between values that you want to allow the user to enter. When used with the max and min attributes, lets you control the range and increment (for example, allow only even numbers) that the user can enter into an input field.
-     */
-    step: string;
-    /**
-     * Returns the content type of the object.
-     */
-    type: string;
-    /**
-     * Sets or retrieves the URL, often with a bookmark extension (#name), to use as a client-side image map.
-     */
-    /** @deprecated */
-    useMap: string;
-    /**
-     * Returns the error message that would be displayed if the user submits the form, or an empty string if no error message. It also triggers the standard error message, such as "this is a required field". The result is that the user sees validation messages without actually submitting.
-     */
-    readonly validationMessage: string;
-    /**
-     * Returns a  ValidityState object that represents the validity states of an element.
-     */
-    readonly validity: ValidityState;
-    /**
-     * Returns the value of the data at the cursor's current position.
-     */
-    value: string;
-    valueAsDate: any;
-    /**
-     * Returns the input field value as a number.
-     */
-    valueAsNumber: number;
-    webkitdirectory: boolean;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    width: number;
-    /**
-     * Returns whether an element will successfully validate based on forms validation rules and constraints.
-     */
-    readonly willValidate: boolean;
-    /**
-     * Returns whether a form will validate when it is submitted, without having to submit it.
-     */
-    checkValidity(): boolean;
-    /**
-     * Makes the selection equal to the current object.
-     */
-    select(): void;
-    /**
-     * Sets a custom error message that is displayed when a form is submitted.
-     * @param error Sets a custom error message that is displayed when a form is submitted.
-     */
-    setCustomValidity(error: string): void;
-    /**
-     * Sets the start and end positions of a selection in a text field.
-     * @param start The offset into the text field for the start of the selection.
-     * @param end The offset into the text field for the end of the selection.
-     * @param direction The direction in which the selection is performed.
-     */
-    setSelectionRange(start: number, end: number, direction?: "forward" | "backward" | "none"): void;
-    /**
-     * Decrements a range input control's value by the value given by the Step attribute. If the optional parameter is used, it will decrement the input control's step value multiplied by the parameter's value.
-     * @param n Value to decrement the value by.
-     */
-    stepDown(n?: number): void;
-    /**
-     * Increments a range input control's value by the value given by the Step attribute. If the optional parameter is used, will increment the input control's value by that value.
-     * @param n Value to increment the value by.
-     */
-    stepUp(n?: number): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLInputElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLInputElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLInputElement: {
-    prototype: HTMLInputElement;
-    new(): HTMLInputElement;
-};
-
-interface HTMLLIElement extends HTMLElement {
-    /** @deprecated */
-    type: string;
-    /**
-     * Sets or retrieves the value of a list item.
-     */
-    value: number;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLLIElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLLIElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLLIElement: {
-    prototype: HTMLLIElement;
-    new(): HTMLLIElement;
-};
-
-interface HTMLLabelElement extends HTMLElement {
-    readonly control: HTMLInputElement | null;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Sets or retrieves the object to which the given label object is assigned.
-     */
-    htmlFor: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLLabelElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLLabelElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLLabelElement: {
-    prototype: HTMLLabelElement;
-    new(): HTMLLabelElement;
-};
-
-interface HTMLLegendElement extends HTMLElement {
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    /** @deprecated */
-    align: string;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLLegendElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLLegendElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLLegendElement: {
-    prototype: HTMLLegendElement;
-    new(): HTMLLegendElement;
-};
-
-interface HTMLLinkElement extends HTMLElement, LinkStyle {
-    /**
-     * Sets or retrieves the character set used to encode the object.
-     */
-    /** @deprecated */
-    charset: string;
-    crossOrigin: string | null;
-    /** @deprecated */
-    disabled: boolean;
-    /**
-     * Sets or retrieves a destination URL or an anchor point.
-     */
-    href: string;
-    /**
-     * Sets or retrieves the language code of the object.
-     */
-    hreflang: string;
-    import?: Document;
-    integrity: string;
-    /**
-     * Sets or retrieves the media type.
-     */
-    media: string;
-    /**
-     * Sets or retrieves the relationship between the object and the destination of the link.
-     */
-    rel: string;
-    /**
-     * Sets or retrieves the relationship between the object and the destination of the link.
-     */
-    /** @deprecated */
-    rev: string;
-    /**
-     * Sets or retrieves the window or frame at which to target content.
-     */
-    /** @deprecated */
-    target: string;
-    /**
-     * Sets or retrieves the MIME type of the object.
-     */
-    type: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLLinkElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLLinkElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLLinkElement: {
-    prototype: HTMLLinkElement;
-    new(): HTMLLinkElement;
-};
-
-interface HTMLMainElement extends HTMLElement {
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMainElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMainElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLMainElement: {
-    prototype: HTMLMainElement;
-    new(): HTMLMainElement;
-};
-
-interface HTMLMapElement extends HTMLElement {
-    /**
-     * Retrieves a collection of the area objects defined for the given map object.
-     */
-    readonly areas: HTMLAreasCollection;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    name: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMapElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMapElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLMapElement: {
-    prototype: HTMLMapElement;
-    new(): HTMLMapElement;
-};
-
-interface HTMLMarqueeElementEventMap extends HTMLElementEventMap {
-    "bounce": Event;
-    "finish": Event;
-    "start": Event;
-}
-
-interface HTMLMarqueeElement extends HTMLElement {
-    /** @deprecated */
-    behavior: string;
-    /** @deprecated */
-    bgColor: string;
-    /** @deprecated */
-    direction: string;
-    /** @deprecated */
-    height: string;
-    /** @deprecated */
-    hspace: number;
-    /** @deprecated */
-    loop: number;
-    /** @deprecated */
-    onbounce: ((this: HTMLMarqueeElement, ev: Event) => any) | null;
-    /** @deprecated */
-    onfinish: ((this: HTMLMarqueeElement, ev: Event) => any) | null;
-    /** @deprecated */
-    onstart: ((this: HTMLMarqueeElement, ev: Event) => any) | null;
-    /** @deprecated */
-    scrollAmount: number;
-    /** @deprecated */
-    scrollDelay: number;
-    /** @deprecated */
-    trueSpeed: boolean;
-    /** @deprecated */
-    vspace: number;
-    /** @deprecated */
-    width: string;
-    /** @deprecated */
-    start(): void;
-    /** @deprecated */
-    stop(): void;
-    addEventListener<K extends keyof HTMLMarqueeElementEventMap>(type: K, listener: (this: HTMLMarqueeElement, ev: HTMLMarqueeElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLMarqueeElementEventMap>(type: K, listener: (this: HTMLMarqueeElement, ev: HTMLMarqueeElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLMarqueeElement: {
-    prototype: HTMLMarqueeElement;
-    new(): HTMLMarqueeElement;
-};
-
-interface HTMLMediaElementEventMap extends HTMLElementEventMap {
-    "encrypted": MediaEncryptedEvent;
-    "msneedkey": Event;
-}
-
-interface HTMLMediaElement extends HTMLElement {
-    /**
-     * Returns an AudioTrackList object with the audio tracks for a given video element.
-     */
-    readonly audioTracks: AudioTrackList;
-    /**
-     * Gets or sets a value that indicates whether to start playing the media automatically.
-     */
-    autoplay: boolean;
-    /**
-     * Gets a collection of buffered time ranges.
-     */
-    readonly buffered: TimeRanges;
-    /**
-     * Gets or sets a flag that indicates whether the client provides a set of controls for the media (in case the developer does not include controls for the player).
-     */
-    controls: boolean;
-    crossOrigin: string | null;
-    /**
-     * Gets the address or URL of the current media resource that is selected by IHTMLMediaElement.
-     */
-    readonly currentSrc: string;
-    /**
-     * Gets or sets the current playback position, in seconds.
-     */
-    currentTime: number;
-    defaultMuted: boolean;
-    /**
-     * Gets or sets the default playback rate when the user is not using fast forward or reverse for a video or audio resource.
-     */
-    defaultPlaybackRate: number;
-    /**
-     * Returns the duration in seconds of the current media resource. A NaN value is returned if duration is not available, or Infinity if the media resource is streaming.
-     */
-    readonly duration: number;
-    /**
-     * Gets information about whether the playback has ended or not.
-     */
-    readonly ended: boolean;
-    /**
-     * Returns an object representing the current error state of the audio or video element.
-     */
-    readonly error: MediaError | null;
-    /**
-     * Gets or sets a flag to specify whether playback should restart after it completes.
-     */
-    loop: boolean;
-    readonly mediaKeys: MediaKeys | null;
-    /**
-     * Specifies the purpose of the audio or video media, such as background audio or alerts.
-     */
-    msAudioCategory: string;
-    /**
-     * Specifies the output device id that the audio will be sent to.
-     */
-    msAudioDeviceType: string;
-    readonly msGraphicsTrustStatus: MSGraphicsTrust;
-    /**
-     * Gets the MSMediaKeys object, which is used for decrypting media data, that is associated with this media element.
-     */
-    /** @deprecated */
-    readonly msKeys: MSMediaKeys;
-    /**
-     * Gets or sets whether the DLNA PlayTo device is available.
-     */
-    msPlayToDisabled: boolean;
-    /**
-     * Gets or sets the path to the preferred media source. This enables the Play To target device to stream the media content, which can be DRM protected, from a different location, such as a cloud media server.
-     */
-    msPlayToPreferredSourceUri: string;
-    /**
-     * Gets or sets the primary DLNA PlayTo device.
-     */
-    msPlayToPrimary: boolean;
-    /**
-     * Gets the source associated with the media element for use by the PlayToManager.
-     */
-    readonly msPlayToSource: any;
-    /**
-     * Specifies whether or not to enable low-latency playback on the media element.
-     */
-    msRealTime: boolean;
-    /**
-     * Gets or sets a flag that indicates whether the audio (either audio or the audio track on video media) is muted.
-     */
-    muted: boolean;
-    /**
-     * Gets the current network activity for the element.
-     */
-    readonly networkState: number;
-    onencrypted: ((this: HTMLMediaElement, ev: MediaEncryptedEvent) => any) | null;
-    /** @deprecated */
-    onmsneedkey: ((this: HTMLMediaElement, ev: Event) => any) | null;
-    /**
-     * Gets a flag that specifies whether playback is paused.
-     */
-    readonly paused: boolean;
-    /**
-     * Gets or sets the current rate of speed for the media resource to play. This speed is expressed as a multiple of the normal speed of the media resource.
-     */
-    playbackRate: number;
-    /**
-     * Gets TimeRanges for the current media resource that has been played.
-     */
-    readonly played: TimeRanges;
-    /**
-     * Gets or sets the current playback position, in seconds.
-     */
-    preload: string;
-    readonly readyState: number;
-    /**
-     * Returns a TimeRanges object that represents the ranges of the current media resource that can be seeked.
-     */
-    readonly seekable: TimeRanges;
-    /**
-     * Gets a flag that indicates whether the the client is currently moving to a new playback position in the media resource.
-     */
-    readonly seeking: boolean;
-    /**
-     * The address or URL of the a media resource that is to be considered.
-     */
-    src: string;
-    srcObject: MediaStream | MediaSource | Blob | null;
-    readonly textTracks: TextTrackList;
-    readonly videoTracks: VideoTrackList;
-    /**
-     * Gets or sets the volume level for audio portions of the media element.
-     */
-    volume: number;
-    addTextTrack(kind: TextTrackKind, label?: string, language?: string): TextTrack;
-    /**
-     * Returns a string that specifies whether the client can play a given media resource type.
-     */
-    canPlayType(type: string): CanPlayTypeResult;
-    /**
-     * Resets the audio or video object and loads a new media resource.
-     */
-    load(): void;
-    /**
-     * Clears all effects from the media pipeline.
-     */
-    msClearEffects(): void;
-    msGetAsCastingSource(): any;
-    /**
-     * Inserts the specified audio effect into media pipeline.
-     */
-    msInsertAudioEffect(activatableClassId: string, effectRequired: boolean, config?: any): void;
-    /** @deprecated */
-    msSetMediaKeys(mediaKeys: MSMediaKeys): void;
-    /**
-     * Specifies the media protection manager for a given media pipeline.
-     */
-    msSetMediaProtectionManager(mediaProtectionManager?: any): void;
-    /**
-     * Pauses the current playback and sets paused to TRUE. This can be used to test whether the media is playing or paused. You can also use the pause or play events to tell whether the media is playing or not.
-     */
-    pause(): void;
-    /**
-     * Loads and starts playback of a media resource.
-     */
-    play(): Promise<void>;
-    setMediaKeys(mediaKeys: MediaKeys | null): Promise<void>;
-    readonly HAVE_CURRENT_DATA: number;
-    readonly HAVE_ENOUGH_DATA: number;
-    readonly HAVE_FUTURE_DATA: number;
-    readonly HAVE_METADATA: number;
-    readonly HAVE_NOTHING: number;
-    readonly NETWORK_EMPTY: number;
-    readonly NETWORK_IDLE: number;
-    readonly NETWORK_LOADING: number;
-    readonly NETWORK_NO_SOURCE: number;
-    addEventListener<K extends keyof HTMLMediaElementEventMap>(type: K, listener: (this: HTMLMediaElement, ev: HTMLMediaElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLMediaElementEventMap>(type: K, listener: (this: HTMLMediaElement, ev: HTMLMediaElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLMediaElement: {
-    prototype: HTMLMediaElement;
-    new(): HTMLMediaElement;
-    readonly HAVE_CURRENT_DATA: number;
-    readonly HAVE_ENOUGH_DATA: number;
-    readonly HAVE_FUTURE_DATA: number;
-    readonly HAVE_METADATA: number;
-    readonly HAVE_NOTHING: number;
-    readonly NETWORK_EMPTY: number;
-    readonly NETWORK_IDLE: number;
-    readonly NETWORK_LOADING: number;
-    readonly NETWORK_NO_SOURCE: number;
-};
-
-interface HTMLMenuElement extends HTMLElement {
-    /** @deprecated */
-    compact: boolean;
-    type: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMenuElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMenuElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLMenuElement: {
-    prototype: HTMLMenuElement;
-    new(): HTMLMenuElement;
-};
-
-interface HTMLMetaElement extends HTMLElement {
-    /**
-     * Sets or retrieves the character set used to encode the object.
-     */
-    /** @deprecated */
-    charset: string;
-    /**
-     * Gets or sets meta-information to associate with httpEquiv or name.
-     */
-    content: string;
-    /**
-     * Gets or sets information used to bind the value of a content attribute of a meta element to an HTTP response header.
-     */
-    httpEquiv: string;
-    /**
-     * Sets or retrieves the value specified in the content attribute of the meta object.
-     */
-    name: string;
-    /**
-     * Sets or retrieves a scheme to be used in interpreting the value of a property specified for the object.
-     */
-    /** @deprecated */
-    scheme: string;
-    /**
-     * Sets or retrieves the URL property that will be loaded after the specified time has elapsed.
-     */
-    /** @deprecated */
-    url: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMetaElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMetaElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLMetaElement: {
-    prototype: HTMLMetaElement;
-    new(): HTMLMetaElement;
-};
-
-interface HTMLMeterElement extends HTMLElement {
-    high: number;
-    low: number;
-    max: number;
-    min: number;
-    optimum: number;
-    value: number;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMeterElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMeterElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLMeterElement: {
-    prototype: HTMLMeterElement;
-    new(): HTMLMeterElement;
-};
-
-interface HTMLModElement extends HTMLElement {
-    /**
-     * Sets or retrieves reference information about the object.
-     */
-    cite: string;
-    /**
-     * Sets or retrieves the date and time of a modification to the object.
-     */
-    dateTime: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLModElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLModElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLModElement: {
-    prototype: HTMLModElement;
-    new(): HTMLModElement;
-};
-
-interface HTMLOListElement extends HTMLElement {
-    /** @deprecated */
-    compact: boolean;
-    /**
-     * The starting number.
-     */
-    start: number;
-    type: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLOListElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLOListElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLOListElement: {
-    prototype: HTMLOListElement;
-    new(): HTMLOListElement;
-};
-
-interface HTMLObjectElement extends HTMLElement, GetSVGDocument {
-    /**
-     * Retrieves a string of the URL where the object tag can be found. This is often the href of the document that the object is in, or the value set by a base element.
-     */
-    readonly BaseHref: string;
-    /** @deprecated */
-    align: string;
-    /**
-     * Sets or retrieves a character string that can be used to implement your own archive functionality for the object.
-     */
-    /** @deprecated */
-    archive: string;
-    /** @deprecated */
-    border: string;
-    /**
-     * Sets or retrieves the URL of the file containing the compiled Java class.
-     */
-    /** @deprecated */
-    code: string;
-    /**
-     * Sets or retrieves the URL of the component.
-     */
-    /** @deprecated */
-    codeBase: string;
-    /**
-     * Sets or retrieves the Internet media type for the code associated with the object.
-     */
-    /** @deprecated */
-    codeType: string;
-    /**
-     * Retrieves the document object of the page or frame.
-     */
-    readonly contentDocument: Document | null;
-    /**
-     * Sets or retrieves the URL that references the data of the object.
-     */
-    data: string;
-    /** @deprecated */
-    declare: boolean;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Sets or retrieves the height of the object.
-     */
-    height: string;
-    /** @deprecated */
-    hspace: number;
-    /**
-     * Gets or sets whether the DLNA PlayTo device is available.
-     */
-    msPlayToDisabled: boolean;
-    /**
-     * Gets or sets the path to the preferred media source. This enables the Play To target device to stream the media content, which can be DRM protected, from a different location, such as a cloud media server.
-     */
-    msPlayToPreferredSourceUri: string;
-    /**
-     * Gets or sets the primary DLNA PlayTo device.
-     */
-    msPlayToPrimary: boolean;
-    /**
-     * Gets the source associated with the media element for use by the PlayToManager.
-     */
-    readonly msPlayToSource: any;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    name: string;
-    readonly readyState: number;
-    /**
-     * Sets or retrieves a message to be displayed while an object is loading.
-     */
-    /** @deprecated */
-    standby: string;
-    /**
-     * Sets or retrieves the MIME type of the object.
-     */
-    type: string;
-    typemustmatch: boolean;
-    /**
-     * Sets or retrieves the URL, often with a bookmark extension (#name), to use as a client-side image map.
-     */
-    useMap: string;
-    /**
-     * Returns the error message that would be displayed if the user submits the form, or an empty string if no error message. It also triggers the standard error message, such as "this is a required field". The result is that the user sees validation messages without actually submitting.
-     */
-    readonly validationMessage: string;
-    /**
-     * Returns a  ValidityState object that represents the validity states of an element.
-     */
-    readonly validity: ValidityState;
-    /** @deprecated */
-    vspace: number;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    width: string;
-    /**
-     * Returns whether an element will successfully validate based on forms validation rules and constraints.
-     */
-    readonly willValidate: boolean;
-    /**
-     * Returns whether a form will validate when it is submitted, without having to submit it.
-     */
-    checkValidity(): boolean;
-    /**
-     * Sets a custom error message that is displayed when a form is submitted.
-     * @param error Sets a custom error message that is displayed when a form is submitted.
-     */
-    setCustomValidity(error: string): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLObjectElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLObjectElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLObjectElement: {
-    prototype: HTMLObjectElement;
-    new(): HTMLObjectElement;
-};
-
-interface HTMLOptGroupElement extends HTMLElement {
-    disabled: boolean;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Sets or retrieves a value that you can use to implement your own label functionality for the object.
-     */
-    label: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLOptGroupElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLOptGroupElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLOptGroupElement: {
-    prototype: HTMLOptGroupElement;
-    new(): HTMLOptGroupElement;
-};
-
-interface HTMLOptionElement extends HTMLElement {
-    /**
-     * Sets or retrieves the status of an option.
-     */
-    defaultSelected: boolean;
-    disabled: boolean;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Sets or retrieves the ordinal position of an option in a list box.
-     */
-    readonly index: number;
-    /**
-     * Sets or retrieves a value that you can use to implement your own label functionality for the object.
-     */
-    label: string;
-    /**
-     * Sets or retrieves whether the option in the list box is the default item.
-     */
-    selected: boolean;
-    /**
-     * Sets or retrieves the text string specified by the option tag.
-     */
-    text: string;
-    /**
-     * Sets or retrieves the value which is returned to the server when the form control is submitted.
-     */
-    value: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLOptionElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLOptionElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLOptionElement: {
-    prototype: HTMLOptionElement;
-    new(): HTMLOptionElement;
-};
-
-interface HTMLOptionsCollection extends HTMLCollectionOf<HTMLOptionElement> {
-    length: number;
-    selectedIndex: number;
-    add(element: HTMLOptionElement | HTMLOptGroupElement, before?: HTMLElement | number | null): void;
-    remove(index: number): void;
-}
-
-declare var HTMLOptionsCollection: {
-    prototype: HTMLOptionsCollection;
-    new(): HTMLOptionsCollection;
-};
-
-interface HTMLOutputElement extends HTMLElement {
-    defaultValue: string;
-    readonly form: HTMLFormElement | null;
-    readonly htmlFor: DOMTokenList;
-    name: string;
-    readonly type: string;
-    readonly validationMessage: string;
-    readonly validity: ValidityState;
-    value: string;
-    readonly willValidate: boolean;
-    checkValidity(): boolean;
-    reportValidity(): boolean;
-    setCustomValidity(error: string): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLOutputElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLOutputElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLOutputElement: {
-    prototype: HTMLOutputElement;
-    new(): HTMLOutputElement;
-};
-
-interface HTMLParagraphElement extends HTMLElement {
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    /** @deprecated */
-    align: string;
-    clear: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLParagraphElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLParagraphElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLParagraphElement: {
-    prototype: HTMLParagraphElement;
-    new(): HTMLParagraphElement;
-};
-
-interface HTMLParamElement extends HTMLElement {
-    /**
-     * Sets or retrieves the name of an input parameter for an element.
-     */
-    name: string;
-    /**
-     * Sets or retrieves the content type of the resource designated by the value attribute.
-     */
-    /** @deprecated */
-    type: string;
-    /**
-     * Sets or retrieves the value of an input parameter for an element.
-     */
-    value: string;
-    /**
-     * Sets or retrieves the data type of the value attribute.
-     */
-    /** @deprecated */
-    valueType: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLParamElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLParamElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLParamElement: {
-    prototype: HTMLParamElement;
-    new(): HTMLParamElement;
-};
-
-interface HTMLPictureElement extends HTMLElement {
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLPictureElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLPictureElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLPictureElement: {
-    prototype: HTMLPictureElement;
-    new(): HTMLPictureElement;
-};
-
-interface HTMLPreElement extends HTMLElement {
-    /**
-     * Sets or gets a value that you can use to implement your own width functionality for the object.
-     */
-    /** @deprecated */
-    width: number;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLPreElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLPreElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLPreElement: {
-    prototype: HTMLPreElement;
-    new(): HTMLPreElement;
-};
-
-interface HTMLProgressElement extends HTMLElement {
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Defines the maximum, or "done" value for a progress element.
-     */
-    max: number;
-    /**
-     * Returns the quotient of value/max when the value attribute is set (determinate progress bar), or -1 when the value attribute is missing (indeterminate progress bar).
-     */
-    readonly position: number;
-    /**
-     * Sets or gets the current value of a progress element. The value must be a non-negative number between 0 and the max value.
-     */
-    value: number;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLProgressElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLProgressElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLProgressElement: {
-    prototype: HTMLProgressElement;
-    new(): HTMLProgressElement;
-};
-
-interface HTMLQuoteElement extends HTMLElement {
-    /**
-     * Sets or retrieves reference information about the object.
-     */
-    cite: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLQuoteElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLQuoteElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLQuoteElement: {
-    prototype: HTMLQuoteElement;
-    new(): HTMLQuoteElement;
-};
-
-interface HTMLScriptElement extends HTMLElement {
-    async: boolean;
-    /**
-     * Sets or retrieves the character set used to encode the object.
-     */
-    charset: string;
-    crossOrigin: string | null;
-    /**
-     * Sets or retrieves the status of the script.
-     */
-    defer: boolean;
-    /**
-     * Sets or retrieves the event for which the script is written.
-     */
-    /** @deprecated */
-    event: string;
-    /**
-     * Sets or retrieves the object that is bound to the event script.
-     */
-    /** @deprecated */
-    htmlFor: string;
-    integrity: string;
-    noModule: boolean;
-    /**
-     * Retrieves the URL to an external file that contains the source code or data.
-     */
-    src: string;
-    /**
-     * Retrieves or sets the text of the object as a string.
-     */
-    text: string;
-    /**
-     * Sets or retrieves the MIME type for the associated scripting engine.
-     */
-    type: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLScriptElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLScriptElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLScriptElement: {
-    prototype: HTMLScriptElement;
-    new(): HTMLScriptElement;
-};
-
-interface HTMLSelectElement extends HTMLElement {
-    /**
-     * Provides a way to direct a user to a specific field when a document loads. This can provide both direction and convenience for a user, reducing the need to click or tab to a field when a page opens. This attribute is true when present on an element, and false when missing.
-     */
-    autofocus: boolean;
-    disabled: boolean;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Sets or retrieves the number of objects in a collection.
-     */
-    length: number;
-    /**
-     * Sets or retrieves the Boolean value indicating whether multiple items can be selected from a list.
-     */
-    multiple: boolean;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    name: string;
-    readonly options: HTMLOptionsCollection;
-    /**
-     * When present, marks an element that can't be submitted without a value.
-     */
-    required: boolean;
-    /**
-     * Sets or retrieves the index of the selected option in a select object.
-     */
-    selectedIndex: number;
-    readonly selectedOptions: HTMLCollectionOf<HTMLOptionElement>;
-    /**
-     * Sets or retrieves the number of rows in the list box.
-     */
-    size: number;
-    /**
-     * Retrieves the type of select control based on the value of the MULTIPLE attribute.
-     */
-    readonly type: string;
-    /**
-     * Returns the error message that would be displayed if the user submits the form, or an empty string if no error message. It also triggers the standard error message, such as "this is a required field". The result is that the user sees validation messages without actually submitting.
-     */
-    readonly validationMessage: string;
-    /**
-     * Returns a  ValidityState object that represents the validity states of an element.
-     */
-    readonly validity: ValidityState;
-    /**
-     * Sets or retrieves the value which is returned to the server when the form control is submitted.
-     */
-    value: string;
-    /**
-     * Returns whether an element will successfully validate based on forms validation rules and constraints.
-     */
-    readonly willValidate: boolean;
-    /**
-     * Adds an element to the areas, controlRange, or options collection.
-     * @param element Variant of type Number that specifies the index position in the collection where the element is placed. If no value is given, the method places the element at the end of the collection.
-     * @param before Variant of type Object that specifies an element to insert before, or null to append the object to the collection.
-     */
-    add(element: HTMLOptionElement | HTMLOptGroupElement, before?: HTMLElement | number | null): void;
-    /**
-     * Returns whether a form will validate when it is submitted, without having to submit it.
-     */
-    checkValidity(): boolean;
-    /**
-     * Retrieves a select object or an object from an options collection.
-     * @param name Variant of type Number or String that specifies the object or collection to retrieve. If this parameter is an integer, it is the zero-based index of the object. If this parameter is a string, all objects with matching name or id properties are retrieved, and a collection is returned if more than one match is made.
-     * @param index Variant of type Number that specifies the zero-based index of the object to retrieve when a collection is returned.
-     */
-    item(name?: any, index?: any): Element | null;
-    /**
-     * Retrieves a select object or an object from an options collection.
-     * @param namedItem A String that specifies the name or id property of the object to retrieve. A collection is returned if more than one match is made.
-     */
-    namedItem(name: string): any;
-    /**
-     * Removes an element from the collection.
-     * @param index Number that specifies the zero-based index of the element to remove from the collection.
-     */
-    remove(index?: number): void;
-    /**
-     * Sets a custom error message that is displayed when a form is submitted.
-     * @param error Sets a custom error message that is displayed when a form is submitted.
-     */
-    setCustomValidity(error: string): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSelectElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSelectElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-    [name: string]: any;
-}
-
-declare var HTMLSelectElement: {
-    prototype: HTMLSelectElement;
-    new(): HTMLSelectElement;
-};
-
-interface HTMLSlotElement extends HTMLElement {
-    name: string;
-    assignedNodes(options?: AssignedNodesOptions): Node[];
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSlotElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSlotElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-interface HTMLSourceElement extends HTMLElement {
-    /**
-     * Gets or sets the intended media type of the media source.
-     */
-    media: string;
-    /** @deprecated */
-    msKeySystem: string;
-    sizes: string;
-    /**
-     * The address or URL of the a media resource that is to be considered.
-     */
-    src: string;
-    srcset: string;
-    /**
-     * Gets or sets the MIME type of a media resource.
-     */
-    type: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSourceElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSourceElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLSourceElement: {
-    prototype: HTMLSourceElement;
-    new(): HTMLSourceElement;
-};
-
-interface HTMLSpanElement extends HTMLElement {
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSpanElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSpanElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLSpanElement: {
-    prototype: HTMLSpanElement;
-    new(): HTMLSpanElement;
-};
-
-interface HTMLStyleElement extends HTMLElement, LinkStyle {
-    /** @deprecated */
-    disabled: boolean;
-    /**
-     * Sets or retrieves the media type.
-     */
-    media: string;
-    /**
-     * Retrieves the CSS language in which the style sheet is written.
-     */
-    type: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLStyleElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLStyleElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLStyleElement: {
-    prototype: HTMLStyleElement;
-    new(): HTMLStyleElement;
-};
-
-interface HTMLSummaryElement extends HTMLElement {
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSummaryElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSummaryElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLSummaryElement: {
-    prototype: HTMLSummaryElement;
-    new(): HTMLSummaryElement;
-};
-
-interface HTMLTableCaptionElement extends HTMLElement {
-    /**
-     * Sets or retrieves the alignment of the caption or legend.
-     */
-    /** @deprecated */
-    align: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableCaptionElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableCaptionElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTableCaptionElement: {
-    prototype: HTMLTableCaptionElement;
-    new(): HTMLTableCaptionElement;
-};
-
-interface HTMLTableCellElement extends HTMLElement {
-    /**
-     * Sets or retrieves abbreviated text for the object.
-     */
-    abbr: string;
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    /** @deprecated */
-    align: string;
-    /**
-     * Sets or retrieves a comma-delimited list of conceptual categories associated with the object.
-     */
-    /** @deprecated */
-    axis: string;
-    /** @deprecated */
-    bgColor: string;
-    /**
-     * Retrieves the position of the object in the cells collection of a row.
-     */
-    readonly cellIndex: number;
-    /** @deprecated */
-    ch: string;
-    /** @deprecated */
-    chOff: string;
-    /**
-     * Sets or retrieves the number columns in the table that the object should span.
-     */
-    colSpan: number;
-    /**
-     * Sets or retrieves a list of header cells that provide information for the object.
-     */
-    headers: string;
-    /**
-     * Sets or retrieves the height of the object.
-     */
-    /** @deprecated */
-    height: string;
-    /**
-     * Sets or retrieves whether the browser automatically performs wordwrap.
-     */
-    /** @deprecated */
-    noWrap: boolean;
-    /**
-     * Sets or retrieves how many rows in a table the cell should span.
-     */
-    rowSpan: number;
-    /**
-     * Sets or retrieves the group of cells in a table to which the object's information applies.
-     */
-    scope: string;
-    /** @deprecated */
-    vAlign: string;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    /** @deprecated */
-    width: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableCellElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableCellElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTableCellElement: {
-    prototype: HTMLTableCellElement;
-    new(): HTMLTableCellElement;
-};
-
-interface HTMLTableColElement extends HTMLElement {
-    /**
-     * Sets or retrieves the alignment of the object relative to the display or table.
-     */
-    /** @deprecated */
-    align: string;
-    /** @deprecated */
-    ch: string;
-    /** @deprecated */
-    chOff: string;
-    /**
-     * Sets or retrieves the number of columns in the group.
-     */
-    span: number;
-    /** @deprecated */
-    vAlign: string;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    /** @deprecated */
-    width: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableColElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableColElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTableColElement: {
-    prototype: HTMLTableColElement;
-    new(): HTMLTableColElement;
-};
-
-interface HTMLTableDataCellElement extends HTMLTableCellElement {
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableDataCellElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableDataCellElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTableDataCellElement: {
-    prototype: HTMLTableDataCellElement;
-    new(): HTMLTableDataCellElement;
-};
-
-interface HTMLTableElement extends HTMLElement {
-    /**
-     * Sets or retrieves a value that indicates the table alignment.
-     */
-    /** @deprecated */
-    align: string;
-    /** @deprecated */
-    bgColor: string;
-    /**
-     * Sets or retrieves the width of the border to draw around the object.
-     */
-    /** @deprecated */
-    border: string;
-    /**
-     * Retrieves the caption object of a table.
-     */
-    caption: HTMLTableCaptionElement | null;
-    /**
-     * Sets or retrieves the amount of space between the border of the cell and the content of the cell.
-     */
-    /** @deprecated */
-    cellPadding: string;
-    /**
-     * Sets or retrieves the amount of space between cells in a table.
-     */
-    /** @deprecated */
-    cellSpacing: string;
-    /**
-     * Sets or retrieves the way the border frame around the table is displayed.
-     */
-    /** @deprecated */
-    frame: string;
-    /**
-     * Sets or retrieves the number of horizontal rows contained in the object.
-     */
-    readonly rows: HTMLCollectionOf<HTMLTableRowElement>;
-    /**
-     * Sets or retrieves which dividing lines (inner borders) are displayed.
-     */
-    /** @deprecated */
-    rules: string;
-    /**
-     * Sets or retrieves a description and/or structure of the object.
-     */
-    /** @deprecated */
-    summary: string;
-    /**
-     * Retrieves a collection of all tBody objects in the table. Objects in this collection are in source order.
-     */
-    readonly tBodies: HTMLCollectionOf<HTMLTableSectionElement>;
-    /**
-     * Retrieves the tFoot object of the table.
-     */
-    tFoot: HTMLTableSectionElement | null;
-    /**
-     * Retrieves the tHead object of the table.
-     */
-    tHead: HTMLTableSectionElement | null;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    /** @deprecated */
-    width: string;
-    /**
-     * Creates an empty caption element in the table.
-     */
-    createCaption(): HTMLTableCaptionElement;
-    /**
-     * Creates an empty tBody element in the table.
-     */
-    createTBody(): HTMLTableSectionElement;
-    /**
-     * Creates an empty tFoot element in the table.
-     */
-    createTFoot(): HTMLTableSectionElement;
-    /**
-     * Returns the tHead element object if successful, or null otherwise.
-     */
-    createTHead(): HTMLTableSectionElement;
-    /**
-     * Deletes the caption element and its contents from the table.
-     */
-    deleteCaption(): void;
-    /**
-     * Removes the specified row (tr) from the element and from the rows collection.
-     * @param index Number that specifies the zero-based position in the rows collection of the row to remove.
-     */
-    deleteRow(index?: number): void;
-    /**
-     * Deletes the tFoot element and its contents from the table.
-     */
-    deleteTFoot(): void;
-    /**
-     * Deletes the tHead element and its contents from the table.
-     */
-    deleteTHead(): void;
-    /**
-     * Creates a new row (tr) in the table, and adds the row to the rows collection.
-     * @param index Number that specifies where to insert the row in the rows collection. The default value is -1, which appends the new row to the end of the rows collection.
-     */
-    insertRow(index?: number): HTMLTableRowElement;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTableElement: {
-    prototype: HTMLTableElement;
-    new(): HTMLTableElement;
-};
-
-interface HTMLTableHeaderCellElement extends HTMLTableCellElement {
-    scope: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableHeaderCellElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableHeaderCellElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTableHeaderCellElement: {
-    prototype: HTMLTableHeaderCellElement;
-    new(): HTMLTableHeaderCellElement;
-};
-
-interface HTMLTableRowElement extends HTMLElement {
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    /** @deprecated */
-    align: string;
-    /** @deprecated */
-    bgColor: string;
-    /**
-     * Retrieves a collection of all cells in the table row.
-     */
-    readonly cells: HTMLCollectionOf<HTMLTableDataCellElement | HTMLTableHeaderCellElement>;
-    /** @deprecated */
-    ch: string;
-    /** @deprecated */
-    chOff: string;
-    /**
-     * Retrieves the position of the object in the rows collection for the table.
-     */
-    readonly rowIndex: number;
-    /**
-     * Retrieves the position of the object in the collection.
-     */
-    readonly sectionRowIndex: number;
-    /** @deprecated */
-    vAlign: string;
-    /**
-     * Removes the specified cell from the table row, as well as from the cells collection.
-     * @param index Number that specifies the zero-based position of the cell to remove from the table row. If no value is provided, the last cell in the cells collection is deleted.
-     */
-    deleteCell(index?: number): void;
-    /**
-     * Creates a new cell in the table row, and adds the cell to the cells collection.
-     * @param index Number that specifies where to insert the cell in the tr. The default value is -1, which appends the new cell to the end of the cells collection.
-     */
-    insertCell(index?: number): HTMLTableDataCellElement;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableRowElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableRowElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTableRowElement: {
-    prototype: HTMLTableRowElement;
-    new(): HTMLTableRowElement;
-};
-
-interface HTMLTableSectionElement extends HTMLElement {
-    /**
-     * Sets or retrieves a value that indicates the table alignment.
-     */
-    /** @deprecated */
-    align: string;
-    /** @deprecated */
-    ch: string;
-    /** @deprecated */
-    chOff: string;
-    /**
-     * Sets or retrieves the number of horizontal rows contained in the object.
-     */
-    readonly rows: HTMLCollectionOf<HTMLTableRowElement>;
-    /** @deprecated */
-    vAlign: string;
-    /**
-     * Removes the specified row (tr) from the element and from the rows collection.
-     * @param index Number that specifies the zero-based position in the rows collection of the row to remove.
-     */
-    deleteRow(index?: number): void;
-    /**
-     * Creates a new row (tr) in the table, and adds the row to the rows collection.
-     * @param index Number that specifies where to insert the row in the rows collection. The default value is -1, which appends the new row to the end of the rows collection.
-     */
-    insertRow(index?: number): HTMLTableRowElement;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableSectionElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableSectionElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTableSectionElement: {
-    prototype: HTMLTableSectionElement;
-    new(): HTMLTableSectionElement;
-};
-
-interface HTMLTemplateElement extends HTMLElement {
-    readonly content: DocumentFragment;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTemplateElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTemplateElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTemplateElement: {
-    prototype: HTMLTemplateElement;
-    new(): HTMLTemplateElement;
-};
-
-interface HTMLTextAreaElement extends HTMLElement {
-    /**
-     * Provides a way to direct a user to a specific field when a document loads. This can provide both direction and convenience for a user, reducing the need to click or tab to a field when a page opens. This attribute is true when present on an element, and false when missing.
-     */
-    autofocus: boolean;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    cols: number;
-    /**
-     * Sets or retrieves the initial contents of the object.
-     */
-    defaultValue: string;
-    disabled: boolean;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Sets or retrieves the maximum number of characters that the user can enter in a text control.
-     */
-    maxLength: number;
-    minLength: number;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    name: string;
-    /**
-     * Gets or sets a text string that is displayed in an input field as a hint or prompt to users as the format or type of information they need to enter.The text appears in an input field until the user puts focus on the field.
-     */
-    placeholder: string;
-    /**
-     * Sets or retrieves the value indicated whether the content of the object is read-only.
-     */
-    readOnly: boolean;
-    /**
-     * When present, marks an element that can't be submitted without a value.
-     */
-    required: boolean;
-    /**
-     * Sets or retrieves the number of horizontal rows contained in the object.
-     */
-    rows: number;
-    /**
-     * Gets or sets the end position or offset of a text selection.
-     */
-    selectionEnd: number;
-    /**
-     * Gets or sets the starting position or offset of a text selection.
-     */
-    selectionStart: number;
-    /**
-     * Retrieves the type of control.
-     */
-    readonly type: string;
-    /**
-     * Returns the error message that would be displayed if the user submits the form, or an empty string if no error message. It also triggers the standard error message, such as "this is a required field". The result is that the user sees validation messages without actually submitting.
-     */
-    readonly validationMessage: string;
-    /**
-     * Returns a  ValidityState object that represents the validity states of an element.
-     */
-    readonly validity: ValidityState;
-    /**
-     * Retrieves or sets the text in the entry field of the textArea element.
-     */
-    value: string;
-    /**
-     * Returns whether an element will successfully validate based on forms validation rules and constraints.
-     */
-    readonly willValidate: boolean;
-    /**
-     * Sets or retrieves how to handle wordwrapping in the object.
-     */
-    wrap: string;
-    /**
-     * Returns whether a form will validate when it is submitted, without having to submit it.
-     */
-    checkValidity(): boolean;
-    /**
-     * Highlights the input area of a form element.
-     */
-    select(): void;
-    /**
-     * Sets a custom error message that is displayed when a form is submitted.
-     * @param error Sets a custom error message that is displayed when a form is submitted.
-     */
-    setCustomValidity(error: string): void;
-    /**
-     * Sets the start and end positions of a selection in a text field.
-     * @param start The offset into the text field for the start of the selection.
-     * @param end The offset into the text field for the end of the selection.
-     * @param direction The direction in which the selection is performed.
-     */
-    setSelectionRange(start: number, end: number, direction?: "forward" | "backward" | "none"): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTextAreaElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTextAreaElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTextAreaElement: {
-    prototype: HTMLTextAreaElement;
-    new(): HTMLTextAreaElement;
-};
-
-interface HTMLTimeElement extends HTMLElement {
-    dateTime: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTimeElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTimeElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTimeElement: {
-    prototype: HTMLTimeElement;
-    new(): HTMLTimeElement;
-};
-
-interface HTMLTitleElement extends HTMLElement {
-    /**
-     * Retrieves or sets the text of the object as a string.
-     */
-    text: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTitleElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTitleElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTitleElement: {
-    prototype: HTMLTitleElement;
-    new(): HTMLTitleElement;
-};
-
-interface HTMLTrackElement extends HTMLElement {
-    default: boolean;
-    kind: string;
-    label: string;
-    readonly readyState: number;
-    src: string;
-    srclang: string;
-    readonly track: TextTrack;
-    readonly ERROR: number;
-    readonly LOADED: number;
-    readonly LOADING: number;
-    readonly NONE: number;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTrackElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTrackElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTrackElement: {
-    prototype: HTMLTrackElement;
-    new(): HTMLTrackElement;
-    readonly ERROR: number;
-    readonly LOADED: number;
-    readonly LOADING: number;
-    readonly NONE: number;
-};
-
-interface HTMLUListElement extends HTMLElement {
-    /** @deprecated */
-    compact: boolean;
-    /** @deprecated */
-    type: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLUListElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLUListElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLUListElement: {
-    prototype: HTMLUListElement;
-    new(): HTMLUListElement;
-};
-
-interface HTMLUnknownElement extends HTMLElement {
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLUnknownElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLUnknownElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLUnknownElement: {
-    prototype: HTMLUnknownElement;
-    new(): HTMLUnknownElement;
-};
-
-interface HTMLVideoElementEventMap extends HTMLMediaElementEventMap {
-    "MSVideoFormatChanged": Event;
-    "MSVideoFrameStepCompleted": Event;
-    "MSVideoOptimalLayoutChanged": Event;
-}
-
-interface HTMLVideoElement extends HTMLMediaElement {
-    /**
-     * Gets or sets the height of the video element.
-     */
-    height: number;
-    msHorizontalMirror: boolean;
-    readonly msIsLayoutOptimalForPlayback: boolean;
-    readonly msIsStereo3D: boolean;
-    msStereo3DPackingMode: string;
-    msStereo3DRenderMode: string;
-    msZoom: boolean;
-    onMSVideoFormatChanged: ((this: HTMLVideoElement, ev: Event) => any) | null;
-    onMSVideoFrameStepCompleted: ((this: HTMLVideoElement, ev: Event) => any) | null;
-    onMSVideoOptimalLayoutChanged: ((this: HTMLVideoElement, ev: Event) => any) | null;
-    /**
-     * Gets or sets a URL of an image to display, for example, like a movie poster. This can be a still frame from the video, or another image if no video data is available.
-     */
-    poster: string;
-    /**
-     * Gets the intrinsic height of a video in CSS pixels, or zero if the dimensions are not known.
-     */
-    readonly videoHeight: number;
-    /**
-     * Gets the intrinsic width of a video in CSS pixels, or zero if the dimensions are not known.
-     */
-    readonly videoWidth: number;
-    readonly webkitDisplayingFullscreen: boolean;
-    readonly webkitSupportsFullscreen: boolean;
-    /**
-     * Gets or sets the width of the video element.
-     */
-    width: number;
-    getVideoPlaybackQuality(): VideoPlaybackQuality;
-    msFrameStep(forward: boolean): void;
-    msInsertVideoEffect(activatableClassId: string, effectRequired: boolean, config?: any): void;
-    msSetVideoRectangle(left: number, top: number, right: number, bottom: number): void;
-    webkitEnterFullScreen(): void;
-    webkitEnterFullscreen(): void;
-    webkitExitFullScreen(): void;
-    webkitExitFullscreen(): void;
-    addEventListener<K extends keyof HTMLVideoElementEventMap>(type: K, listener: (this: HTMLVideoElement, ev: HTMLVideoElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLVideoElementEventMap>(type: K, listener: (this: HTMLVideoElement, ev: HTMLVideoElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLVideoElement: {
-    prototype: HTMLVideoElement;
-    new(): HTMLVideoElement;
-};
-
-interface HTMLegendElement {
-    readonly form: HTMLFormElement | null;
-}
-
-declare var HTMLegendElement: {
-    prototype: HTMLegendElement;
-    new(): HTMLegendElement;
-};
-
-interface HashChangeEvent extends Event {
-    readonly newURL: string;
-    readonly oldURL: string;
-}
-
-declare var HashChangeEvent: {
-    prototype: HashChangeEvent;
-    new(type: string, eventInitDict?: HashChangeEventInit): HashChangeEvent;
-};
-
-interface Headers {
-    append(name: string, value: string): void;
-    delete(name: string): void;
-    forEach(callback: Function, thisArg?: any): void;
-    get(name: string): string | null;
-    has(name: string): boolean;
-    set(name: string, value: string): void;
-}
-
-declare var Headers: {
-    prototype: Headers;
-    new(init?: HeadersInit): Headers;
-};
-
-interface History {
-    readonly length: number;
-    scrollRestoration: ScrollRestoration;
-    readonly state: any;
-    back(distance?: any): void;
-    forward(distance?: any): void;
-    go(delta?: any): void;
-    pushState(data: any, title?: string, url?: string | null): void;
-    replaceState(data: any, title?: string, url?: string | null): void;
-}
-
-declare var History: {
-    prototype: History;
-    new(): History;
-};
-
-interface HkdfCtrParams extends Algorithm {
-    context: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer;
-    hash: string | Algorithm;
-    label: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer;
-}
-
-interface IDBArrayKey extends Array<number | string | Date | IDBArrayKey> {
-}
-
-interface IDBCursor {
-    readonly direction: IDBCursorDirection;
-    readonly key: IDBKeyRange | number | string | Date | IDBArrayKey;
-    readonly primaryKey: any;
-    readonly source: IDBObjectStore | IDBIndex;
-    advance(count: number): void;
-    continue(key?: IDBKeyRange | number | string | Date | IDBArrayKey): void;
-    delete(): IDBRequest;
-    update(value: any): IDBRequest;
-    readonly NEXT: string;
-    readonly NEXT_NO_DUPLICATE: string;
-    readonly PREV: string;
-    readonly PREV_NO_DUPLICATE: string;
-}
-
-declare var IDBCursor: {
-    prototype: IDBCursor;
-    new(): IDBCursor;
-    readonly NEXT: string;
-    readonly NEXT_NO_DUPLICATE: string;
-    readonly PREV: string;
-    readonly PREV_NO_DUPLICATE: string;
-};
-
-interface IDBCursorWithValue extends IDBCursor {
-    readonly value: any;
-}
-
-declare var IDBCursorWithValue: {
-    prototype: IDBCursorWithValue;
-    new(): IDBCursorWithValue;
-};
-
-interface IDBDatabaseEventMap {
-    "abort": Event;
-    "error": Event;
-}
-
-interface IDBDatabase extends EventTarget {
-    readonly name: string;
-    readonly objectStoreNames: DOMStringList;
-    onabort: ((this: IDBDatabase, ev: Event) => any) | null;
-    onerror: ((this: IDBDatabase, ev: Event) => any) | null;
-    onversionchange: ((this: IDBDatabase, ev: Event) => any) | null;
-    readonly version: number;
-    close(): void;
-    createObjectStore(name: string, optionalParameters?: IDBObjectStoreParameters): IDBObjectStore;
-    deleteObjectStore(name: string): void;
-    transaction(storeNames: string | string[], mode?: IDBTransactionMode): IDBTransaction;
-    addEventListener<K extends keyof IDBDatabaseEventMap>(type: K, listener: (this: IDBDatabase, ev: IDBDatabaseEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof IDBDatabaseEventMap>(type: K, listener: (this: IDBDatabase, ev: IDBDatabaseEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var IDBDatabase: {
-    prototype: IDBDatabase;
-    new(): IDBDatabase;
-};
-
-interface IDBEnvironment {
-    readonly indexedDB: IDBFactory;
-}
-
-interface IDBFactory {
-    cmp(first: any, second: any): number;
-    deleteDatabase(name: string): IDBOpenDBRequest;
-    open(name: string, version?: number): IDBOpenDBRequest;
-}
-
-declare var IDBFactory: {
-    prototype: IDBFactory;
-    new(): IDBFactory;
-};
-
-interface IDBIndex {
-    readonly keyPath: string | string[];
-    multiEntry: boolean;
-    readonly name: string;
-    readonly objectStore: IDBObjectStore;
-    readonly unique: boolean;
-    count(key?: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-    get(key: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-    getKey(key: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-    openCursor(range?: IDBKeyRange | number | string | Date | IDBArrayKey, direction?: IDBCursorDirection): IDBRequest;
-    openKeyCursor(range?: IDBKeyRange | number | string | Date | IDBArrayKey, direction?: IDBCursorDirection): IDBRequest;
-}
-
-declare var IDBIndex: {
-    prototype: IDBIndex;
-    new(): IDBIndex;
-};
-
-interface IDBKeyRange {
-    readonly lower: any;
-    readonly lowerOpen: boolean;
-    readonly upper: any;
-    readonly upperOpen: boolean;
-}
-
-declare var IDBKeyRange: {
-    prototype: IDBKeyRange;
-    new(): IDBKeyRange;
-    bound(lower: any, upper: any, lowerOpen?: boolean, upperOpen?: boolean): IDBKeyRange;
-    lowerBound(lower: any, open?: boolean): IDBKeyRange;
-    only(value: any): IDBKeyRange;
-    upperBound(upper: any, open?: boolean): IDBKeyRange;
-};
-
-interface IDBObjectStore {
-    autoIncrement: boolean;
-    readonly indexNames: DOMStringList;
-    readonly keyPath: string | string[] | null;
-    readonly name: string;
-    readonly transaction: IDBTransaction;
-    add(value: any, key?: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-    clear(): IDBRequest;
-    count(key?: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-    createIndex(name: string, keyPath: string | string[], optionalParameters?: IDBIndexParameters): IDBIndex;
-    delete(key: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-    deleteIndex(indexName: string): void;
-    get(key: any): IDBRequest;
-    index(name: string): IDBIndex;
-    openCursor(range?: IDBKeyRange | number | string | Date | IDBArrayKey, direction?: IDBCursorDirection): IDBRequest;
-    put(value: any, key?: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-}
-
-declare var IDBObjectStore: {
-    prototype: IDBObjectStore;
-    new(): IDBObjectStore;
-};
-
-interface IDBOpenDBRequestEventMap extends IDBRequestEventMap {
-    "blocked": Event;
-    "upgradeneeded": IDBVersionChangeEvent;
-}
-
-interface IDBOpenDBRequest extends IDBRequest {
-    onblocked: ((this: IDBOpenDBRequest, ev: Event) => any) | null;
-    onupgradeneeded: ((this: IDBOpenDBRequest, ev: IDBVersionChangeEvent) => any) | null;
-    addEventListener<K extends keyof IDBOpenDBRequestEventMap>(type: K, listener: (this: IDBOpenDBRequest, ev: IDBOpenDBRequestEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof IDBOpenDBRequestEventMap>(type: K, listener: (this: IDBOpenDBRequest, ev: IDBOpenDBRequestEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var IDBOpenDBRequest: {
-    prototype: IDBOpenDBRequest;
-    new(): IDBOpenDBRequest;
-};
-
-interface IDBRequestEventMap {
-    "error": Event;
-    "success": Event;
-}
-
-interface IDBRequest extends EventTarget {
-    readonly error: DOMException;
-    onerror: ((this: IDBRequest, ev: Event) => any) | null;
-    onsuccess: ((this: IDBRequest, ev: Event) => any) | null;
-    readonly readyState: IDBRequestReadyState;
-    readonly result: any;
-    readonly source: IDBObjectStore | IDBIndex | IDBCursor;
-    readonly transaction: IDBTransaction;
-    addEventListener<K extends keyof IDBRequestEventMap>(type: K, listener: (this: IDBRequest, ev: IDBRequestEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof IDBRequestEventMap>(type: K, listener: (this: IDBRequest, ev: IDBRequestEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var IDBRequest: {
-    prototype: IDBRequest;
-    new(): IDBRequest;
-};
-
-interface IDBTransactionEventMap {
-    "abort": Event;
-    "complete": Event;
-    "error": Event;
-}
-
-interface IDBTransaction extends EventTarget {
-    readonly db: IDBDatabase;
-    readonly error: DOMException;
-    readonly mode: IDBTransactionMode;
-    onabort: ((this: IDBTransaction, ev: Event) => any) | null;
-    oncomplete: ((this: IDBTransaction, ev: Event) => any) | null;
-    onerror: ((this: IDBTransaction, ev: Event) => any) | null;
-    abort(): void;
-    objectStore(name: string): IDBObjectStore;
-    readonly READ_ONLY: string;
-    readonly READ_WRITE: string;
-    readonly VERSION_CHANGE: string;
-    addEventListener<K extends keyof IDBTransactionEventMap>(type: K, listener: (this: IDBTransaction, ev: IDBTransactionEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof IDBTransactionEventMap>(type: K, listener: (this: IDBTransaction, ev: IDBTransactionEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var IDBTransaction: {
-    prototype: IDBTransaction;
-    new(): IDBTransaction;
-    readonly READ_ONLY: string;
-    readonly READ_WRITE: string;
-    readonly VERSION_CHANGE: string;
-};
-
-interface IDBVersionChangeEvent extends Event {
-    readonly newVersion: number | null;
-    readonly oldVersion: number;
-}
-
-declare var IDBVersionChangeEvent: {
-    prototype: IDBVersionChangeEvent;
-    new(): IDBVersionChangeEvent;
-};
-
-interface IIRFilterNode extends AudioNode {
-    getFrequencyResponse(frequencyHz: Float32Array, magResponse: Float32Array, phaseResponse: Float32Array): void;
-}
-
-declare var IIRFilterNode: {
-    prototype: IIRFilterNode;
-    new(): IIRFilterNode;
-};
-
-interface ImageBitmap {
-    readonly height: number;
-    readonly width: number;
-    close(): void;
-}
-
-interface ImageBitmapOptions {
-    colorSpaceConversion?: "none" | "default";
-    imageOrientation?: "none" | "flipY";
-    premultiplyAlpha?: "none" | "premultiply" | "default";
-    resizeHeight?: number;
-    resizeQuality?: "pixelated" | "low" | "medium" | "high";
-    resizeWidth?: number;
-}
-
-interface ImageData {
-    readonly data: Uint8ClampedArray;
-    readonly height: number;
-    readonly width: number;
-}
-
-declare var ImageData: {
-    prototype: ImageData;
-    new(width: number, height: number): ImageData;
-    new(array: Uint8ClampedArray, width: number, height: number): ImageData;
-};
-
-interface IntersectionObserver {
-    readonly root: Element | null;
-    readonly rootMargin: string;
-    readonly thresholds: number[];
-    disconnect(): void;
-    observe(target: Element): void;
-    takeRecords(): IntersectionObserverEntry[];
-    unobserve(target: Element): void;
-}
-
-declare var IntersectionObserver: {
-    prototype: IntersectionObserver;
-    new(callback: IntersectionObserverCallback, options?: IntersectionObserverInit): IntersectionObserver;
-};
-
-interface IntersectionObserverEntry {
-    readonly boundingClientRect: ClientRect | DOMRect;
-    readonly intersectionRatio: number;
-    readonly intersectionRect: ClientRect | DOMRect;
-    readonly isIntersecting: boolean;
-    readonly rootBounds: ClientRect | DOMRect;
-    readonly target: Element;
-    readonly time: number;
-}
-
-declare var IntersectionObserverEntry: {
-    prototype: IntersectionObserverEntry;
-    new(intersectionObserverEntryInit: IntersectionObserverEntryInit): IntersectionObserverEntry;
-};
-
-interface KeyboardEvent extends UIEvent {
-    readonly altKey: boolean;
-    /** @deprecated */
-    char: string;
-    /** @deprecated */
-    readonly charCode: number;
-    readonly code: string;
-    readonly ctrlKey: boolean;
-    readonly key: string;
-    /** @deprecated */
-    readonly keyCode: number;
-    readonly location: number;
-    readonly metaKey: boolean;
-    readonly repeat: boolean;
-    readonly shiftKey: boolean;
-    /** @deprecated */
-    readonly which: number;
-    getModifierState(keyArg: string): boolean;
-    /** @deprecated */
-    initKeyboardEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, keyArg: string, locationArg: number, modifiersListArg: string, repeat: boolean, locale: string): void;
-    readonly DOM_KEY_LOCATION_JOYSTICK: number;
-    readonly DOM_KEY_LOCATION_LEFT: number;
-    readonly DOM_KEY_LOCATION_MOBILE: number;
-    readonly DOM_KEY_LOCATION_NUMPAD: number;
-    readonly DOM_KEY_LOCATION_RIGHT: number;
-    readonly DOM_KEY_LOCATION_STANDARD: number;
-}
-
-declare var KeyboardEvent: {
-    prototype: KeyboardEvent;
-    new(typeArg: string, eventInitDict?: KeyboardEventInit): KeyboardEvent;
-    readonly DOM_KEY_LOCATION_JOYSTICK: number;
-    readonly DOM_KEY_LOCATION_LEFT: number;
-    readonly DOM_KEY_LOCATION_MOBILE: number;
-    readonly DOM_KEY_LOCATION_NUMPAD: number;
-    readonly DOM_KEY_LOCATION_RIGHT: number;
-    readonly DOM_KEY_LOCATION_STANDARD: number;
-};
-
-interface LinkStyle {
-    readonly sheet: StyleSheet | null;
-}
-
-interface ListeningStateChangedEvent extends Event {
-    readonly label: string;
-    readonly state: ListeningState;
-}
-
-declare var ListeningStateChangedEvent: {
-    prototype: ListeningStateChangedEvent;
-    new(): ListeningStateChangedEvent;
-};
-
-interface Location {
-    hash: string;
-    host: string;
-    hostname: string;
-    href: string;
-    readonly origin: string;
-    pathname: string;
-    port: string;
-    protocol: string;
-    search: string;
-    assign(url: string): void;
-    reload(forcedReload?: boolean): void;
-    replace(url: string): void;
-    toString(): string;
-}
-
-declare var Location: {
-    prototype: Location;
-    new(): Location;
-};
-
-interface MSAssertion {
-    readonly id: string;
-    readonly type: MSCredentialType;
-}
-
-declare var MSAssertion: {
-    prototype: MSAssertion;
-    new(): MSAssertion;
-};
-
-interface MSBlobBuilder {
-    append(data: any, endings?: string): void;
-    getBlob(contentType?: string): Blob;
-}
-
-declare var MSBlobBuilder: {
-    prototype: MSBlobBuilder;
-    new(): MSBlobBuilder;
-};
-
-interface MSCredentials {
-    getAssertion(challenge: string, filter?: MSCredentialFilter, params?: MSSignatureParameters): Promise<MSAssertion>;
-    makeCredential(accountInfo: MSAccountInfo, params: MSCredentialParameters[], challenge?: string): Promise<MSAssertion>;
-}
-
-declare var MSCredentials: {
-    prototype: MSCredentials;
-    new(): MSCredentials;
-};
-
-interface MSDCCEvent extends Event {
-    readonly maxFr: number;
-    readonly maxFs: number;
-}
-
-declare var MSDCCEvent: {
-    prototype: MSDCCEvent;
-    new(type: string, eventInitDict: MSDCCEventInit): MSDCCEvent;
-};
-
-interface MSDSHEvent extends Event {
-    readonly sources: number[];
-    readonly timestamp: number;
-}
-
-declare var MSDSHEvent: {
-    prototype: MSDSHEvent;
-    new(type: string, eventInitDict: MSDSHEventInit): MSDSHEvent;
-};
-
-interface MSFIDOCredentialAssertion extends MSAssertion {
-    readonly algorithm: string | Algorithm;
-    readonly attestation: any;
-    readonly publicKey: string;
-    readonly transportHints: MSTransportType[];
-}
-
-declare var MSFIDOCredentialAssertion: {
-    prototype: MSFIDOCredentialAssertion;
-    new(): MSFIDOCredentialAssertion;
-};
-
-interface MSFIDOSignature {
-    readonly authnrData: string;
-    readonly clientData: string;
-    readonly signature: string;
-}
-
-declare var MSFIDOSignature: {
-    prototype: MSFIDOSignature;
-    new(): MSFIDOSignature;
-};
-
-interface MSFIDOSignatureAssertion extends MSAssertion {
-    readonly signature: MSFIDOSignature;
-}
-
-declare var MSFIDOSignatureAssertion: {
-    prototype: MSFIDOSignatureAssertion;
-    new(): MSFIDOSignatureAssertion;
-};
-
-interface MSFileSaver {
-    msSaveBlob(blob: any, defaultName?: string): boolean;
-    msSaveOrOpenBlob(blob: any, defaultName?: string): boolean;
-}
-
-interface MSGesture {
-    target: Element;
-    addPointer(pointerId: number): void;
-    stop(): void;
-}
-
-declare var MSGesture: {
-    prototype: MSGesture;
-    new(): MSGesture;
-};
-
-interface MSGestureEvent extends UIEvent {
-    readonly clientX: number;
-    readonly clientY: number;
-    readonly expansion: number;
-    readonly gestureObject: any;
-    readonly hwTimestamp: number;
-    readonly offsetX: number;
-    readonly offsetY: number;
-    readonly rotation: number;
-    readonly scale: number;
-    readonly screenX: number;
-    readonly screenY: number;
-    readonly translationX: number;
-    readonly translationY: number;
-    readonly velocityAngular: number;
-    readonly velocityExpansion: number;
-    readonly velocityX: number;
-    readonly velocityY: number;
-    initGestureEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number, screenXArg: number, screenYArg: number, clientXArg: number, clientYArg: number, offsetXArg: number, offsetYArg: number, translationXArg: number, translationYArg: number, scaleArg: number, expansionArg: number, rotationArg: number, velocityXArg: number, velocityYArg: number, velocityExpansionArg: number, velocityAngularArg: number, hwTimestampArg: number): void;
-    readonly MSGESTURE_FLAG_BEGIN: number;
-    readonly MSGESTURE_FLAG_CANCEL: number;
-    readonly MSGESTURE_FLAG_END: number;
-    readonly MSGESTURE_FLAG_INERTIA: number;
-    readonly MSGESTURE_FLAG_NONE: number;
-}
-
-declare var MSGestureEvent: {
-    prototype: MSGestureEvent;
-    new(): MSGestureEvent;
-    readonly MSGESTURE_FLAG_BEGIN: number;
-    readonly MSGESTURE_FLAG_CANCEL: number;
-    readonly MSGESTURE_FLAG_END: number;
-    readonly MSGESTURE_FLAG_INERTIA: number;
-    readonly MSGESTURE_FLAG_NONE: number;
-};
-
-interface MSGraphicsTrust {
-    readonly constrictionActive: boolean;
-    readonly status: string;
-}
-
-declare var MSGraphicsTrust: {
-    prototype: MSGraphicsTrust;
-    new(): MSGraphicsTrust;
-};
-
-interface MSInputMethodContextEventMap {
-    "MSCandidateWindowHide": Event;
-    "MSCandidateWindowShow": Event;
-    "MSCandidateWindowUpdate": Event;
-}
-
-interface MSInputMethodContext extends EventTarget {
-    readonly compositionEndOffset: number;
-    readonly compositionStartOffset: number;
-    oncandidatewindowhide: ((this: MSInputMethodContext, ev: Event) => any) | null;
-    oncandidatewindowshow: ((this: MSInputMethodContext, ev: Event) => any) | null;
-    oncandidatewindowupdate: ((this: MSInputMethodContext, ev: Event) => any) | null;
-    readonly target: HTMLElement;
-    getCandidateWindowClientRect(): ClientRect;
-    getCompositionAlternatives(): string[];
-    hasComposition(): boolean;
-    isCandidateWindowVisible(): boolean;
-    addEventListener<K extends keyof MSInputMethodContextEventMap>(type: K, listener: (this: MSInputMethodContext, ev: MSInputMethodContextEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof MSInputMethodContextEventMap>(type: K, listener: (this: MSInputMethodContext, ev: MSInputMethodContextEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var MSInputMethodContext: {
-    prototype: MSInputMethodContext;
-    new(): MSInputMethodContext;
-};
-
-interface MSMediaKeyError {
-    readonly code: number;
-    readonly systemCode: number;
-    readonly MS_MEDIA_KEYERR_CLIENT: number;
-    readonly MS_MEDIA_KEYERR_DOMAIN: number;
-    readonly MS_MEDIA_KEYERR_HARDWARECHANGE: number;
-    readonly MS_MEDIA_KEYERR_OUTPUT: number;
-    readonly MS_MEDIA_KEYERR_SERVICE: number;
-    readonly MS_MEDIA_KEYERR_UNKNOWN: number;
-}
-
-declare var MSMediaKeyError: {
-    prototype: MSMediaKeyError;
-    new(): MSMediaKeyError;
-    readonly MS_MEDIA_KEYERR_CLIENT: number;
-    readonly MS_MEDIA_KEYERR_DOMAIN: number;
-    readonly MS_MEDIA_KEYERR_HARDWARECHANGE: number;
-    readonly MS_MEDIA_KEYERR_OUTPUT: number;
-    readonly MS_MEDIA_KEYERR_SERVICE: number;
-    readonly MS_MEDIA_KEYERR_UNKNOWN: number;
-};
-
-interface MSMediaKeyMessageEvent extends Event {
-    readonly destinationURL: string | null;
-    readonly message: Uint8Array;
-}
-
-declare var MSMediaKeyMessageEvent: {
-    prototype: MSMediaKeyMessageEvent;
-    new(): MSMediaKeyMessageEvent;
-};
-
-interface MSMediaKeyNeededEvent extends Event {
-    readonly initData: Uint8Array | null;
-}
-
-declare var MSMediaKeyNeededEvent: {
-    prototype: MSMediaKeyNeededEvent;
-    new(): MSMediaKeyNeededEvent;
-};
-
-interface MSMediaKeySession extends EventTarget {
-    readonly error: MSMediaKeyError | null;
-    readonly keySystem: string;
-    readonly sessionId: string;
-    close(): void;
-    update(key: Uint8Array): void;
-}
-
-declare var MSMediaKeySession: {
-    prototype: MSMediaKeySession;
-    new(): MSMediaKeySession;
-};
-
-interface MSMediaKeys {
-    readonly keySystem: string;
-    createSession(type: string, initData: Uint8Array, cdmData?: Uint8Array | null): MSMediaKeySession;
-}
-
-declare var MSMediaKeys: {
-    prototype: MSMediaKeys;
-    new(keySystem: string): MSMediaKeys;
-    isTypeSupported(keySystem: string, type?: string | null): boolean;
-    isTypeSupportedWithFeatures(keySystem: string, type?: string | null): string;
-};
-
-interface MSNavigatorDoNotTrack {
-    confirmSiteSpecificTrackingException(args: ConfirmSiteSpecificExceptionsInformation): boolean;
-    confirmWebWideTrackingException(args: ExceptionInformation): boolean;
-    removeSiteSpecificTrackingException(args: ExceptionInformation): void;
-    removeWebWideTrackingException(args: ExceptionInformation): void;
-    storeSiteSpecificTrackingException(args: StoreSiteSpecificExceptionsInformation): void;
-    storeWebWideTrackingException(args: StoreExceptionsInformation): void;
-}
-
-interface MSPointerEvent extends MouseEvent {
-    readonly currentPoint: any;
-    readonly height: number;
-    readonly hwTimestamp: number;
-    readonly intermediatePoints: any;
-    readonly isPrimary: boolean;
-    readonly pointerId: number;
-    readonly pointerType: any;
-    readonly pressure: number;
-    readonly rotation: number;
-    readonly tiltX: number;
-    readonly tiltY: number;
-    readonly width: number;
-    getCurrentPoint(element: Element): void;
-    getIntermediatePoints(element: Element): void;
-    initPointerEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number, screenXArg: number, screenYArg: number, clientXArg: number, clientYArg: number, ctrlKeyArg: boolean, altKeyArg: boolean, shiftKeyArg: boolean, metaKeyArg: boolean, buttonArg: number, relatedTargetArg: EventTarget, offsetXArg: number, offsetYArg: number, widthArg: number, heightArg: number, pressure: number, rotation: number, tiltX: number, tiltY: number, pointerIdArg: number, pointerType: any, hwTimestampArg: number, isPrimary: boolean): void;
-}
-
-declare var MSPointerEvent: {
-    prototype: MSPointerEvent;
-    new(typeArg: string, eventInitDict?: PointerEventInit): MSPointerEvent;
-};
-
-interface MSStream {
-    readonly type: string;
-    msClose(): void;
-    msDetachStream(): any;
-}
-
-declare var MSStream: {
-    prototype: MSStream;
-    new(): MSStream;
-};
-
-interface MSStreamReaderEventMap {
-    "abort": UIEvent;
-    "error": ErrorEvent;
-    "load": Event;
-    "loadend": ProgressEvent;
-    "loadstart": Event;
-    "progress": ProgressEvent;
-}
-
-interface MSStreamReader extends EventTarget {
-    readonly error: DOMError;
-    onabort: ((this: MSStreamReader, ev: UIEvent) => any) | null;
-    onerror: ((this: MSStreamReader, ev: ErrorEvent) => any) | null;
-    onload: ((this: MSStreamReader, ev: Event) => any) | null;
-    onloadend: ((this: MSStreamReader, ev: ProgressEvent) => any) | null;
-    onloadstart: ((this: MSStreamReader, ev: Event) => any) | null;
-    onprogress: ((this: MSStreamReader, ev: ProgressEvent) => any) | null;
-    readonly readyState: number;
-    readonly result: any;
-    abort(): void;
-    readAsArrayBuffer(stream: MSStream, size?: number): void;
-    readAsBinaryString(stream: MSStream, size?: number): void;
-    readAsBlob(stream: MSStream, size?: number): void;
-    readAsDataURL(stream: MSStream, size?: number): void;
-    readAsText(stream: MSStream, encoding?: string, size?: number): void;
-    readonly DONE: number;
-    readonly EMPTY: number;
-    readonly LOADING: number;
-    addEventListener<K extends keyof MSStreamReaderEventMap>(type: K, listener: (this: MSStreamReader, ev: MSStreamReaderEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof MSStreamReaderEventMap>(type: K, listener: (this: MSStreamReader, ev: MSStreamReaderEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var MSStreamReader: {
-    prototype: MSStreamReader;
-    new(): MSStreamReader;
-    readonly DONE: number;
-    readonly EMPTY: number;
-    readonly LOADING: number;
-};
-
-interface MediaDeviceInfo {
-    readonly deviceId: string;
-    readonly groupId: string;
-    readonly kind: MediaDeviceKind;
-    readonly label: string;
-}
-
-declare var MediaDeviceInfo: {
-    prototype: MediaDeviceInfo;
-    new(): MediaDeviceInfo;
-};
-
-interface MediaDevicesEventMap {
-    "devicechange": Event;
-}
-
-interface MediaDevices extends EventTarget {
-    ondevicechange: ((this: MediaDevices, ev: Event) => any) | null;
-    enumerateDevices(): Promise<MediaDeviceInfo[]>;
-    getSupportedConstraints(): MediaTrackSupportedConstraints;
-    getUserMedia(constraints: MediaStreamConstraints): Promise<MediaStream>;
-    addEventListener<K extends keyof MediaDevicesEventMap>(type: K, listener: (this: MediaDevices, ev: MediaDevicesEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof MediaDevicesEventMap>(type: K, listener: (this: MediaDevices, ev: MediaDevicesEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var MediaDevices: {
-    prototype: MediaDevices;
-    new(): MediaDevices;
-};
-
-interface MediaElementAudioSourceNode extends AudioNode {
-}
-
-declare var MediaElementAudioSourceNode: {
-    prototype: MediaElementAudioSourceNode;
-    new(): MediaElementAudioSourceNode;
-};
-
-interface MediaEncryptedEvent extends Event {
-    readonly initData: ArrayBuffer | null;
-    readonly initDataType: string;
-}
-
-declare var MediaEncryptedEvent: {
-    prototype: MediaEncryptedEvent;
-    new(type: string, eventInitDict?: MediaEncryptedEventInit): MediaEncryptedEvent;
-};
-
-interface MediaError {
-    readonly code: number;
-    readonly message: string;
-    readonly msExtendedCode: number;
-    readonly MEDIA_ERR_ABORTED: number;
-    readonly MEDIA_ERR_DECODE: number;
-    readonly MEDIA_ERR_NETWORK: number;
-    readonly MEDIA_ERR_SRC_NOT_SUPPORTED: number;
-    readonly MS_MEDIA_ERR_ENCRYPTED: number;
-}
-
-declare var MediaError: {
-    prototype: MediaError;
-    new(): MediaError;
-    readonly MEDIA_ERR_ABORTED: number;
-    readonly MEDIA_ERR_DECODE: number;
-    readonly MEDIA_ERR_NETWORK: number;
-    readonly MEDIA_ERR_SRC_NOT_SUPPORTED: number;
-    readonly MS_MEDIA_ERR_ENCRYPTED: number;
-};
-
-interface MediaKeyMessageEvent extends Event {
-    readonly message: ArrayBuffer;
-    readonly messageType: MediaKeyMessageType;
-}
-
-declare var MediaKeyMessageEvent: {
-    prototype: MediaKeyMessageEvent;
-    new(type: string, eventInitDict?: MediaKeyMessageEventInit): MediaKeyMessageEvent;
-};
-
-interface MediaKeySession extends EventTarget {
-    readonly closed: Promise<void>;
-    readonly expiration: number;
-    readonly keyStatuses: MediaKeyStatusMap;
-    readonly sessionId: string;
-    close(): Promise<void>;
-    generateRequest(initDataType: string, initData: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null): Promise<void>;
-    load(sessionId: string): Promise<boolean>;
-    remove(): Promise<void>;
-    update(response: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null): Promise<void>;
-}
-
-declare var MediaKeySession: {
-    prototype: MediaKeySession;
-    new(): MediaKeySession;
-};
-
-interface MediaKeyStatusMap {
-    readonly size: number;
-    forEach(callback: Function, thisArg?: any): void;
-    get(keyId: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null): MediaKeyStatus;
-    has(keyId: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null): boolean;
-}
-
-declare var MediaKeyStatusMap: {
-    prototype: MediaKeyStatusMap;
-    new(): MediaKeyStatusMap;
-};
-
-interface MediaKeySystemAccess {
-    readonly keySystem: string;
-    createMediaKeys(): Promise<MediaKeys>;
-    getConfiguration(): MediaKeySystemConfiguration;
-}
-
-declare var MediaKeySystemAccess: {
-    prototype: MediaKeySystemAccess;
-    new(): MediaKeySystemAccess;
-};
-
-interface MediaKeys {
-    createSession(sessionType?: MediaKeySessionType): MediaKeySession;
-    setServerCertificate(serverCertificate: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null): Promise<void>;
-}
-
-declare var MediaKeys: {
-    prototype: MediaKeys;
-    new(): MediaKeys;
-};
-
-interface MediaList {
-    readonly length: number;
-    mediaText: string;
-    appendMedium(medium: string): void;
-    deleteMedium(medium: string): void;
-    item(index: number): string | null;
-    toString(): number;
-    [index: number]: string;
-}
-
-declare var MediaList: {
-    prototype: MediaList;
-    new(): MediaList;
-};
-
-interface MediaQueryList {
-    readonly matches: boolean;
-    readonly media: string;
-    addListener(listener: MediaQueryListListener): void;
-    removeListener(listener: MediaQueryListListener): void;
-}
-
-declare var MediaQueryList: {
-    prototype: MediaQueryList;
-    new(): MediaQueryList;
-};
-
-interface MediaSource extends EventTarget {
-    readonly activeSourceBuffers: SourceBufferList;
-    duration: number;
-    readonly readyState: string;
-    readonly sourceBuffers: SourceBufferList;
-    addSourceBuffer(type: string): SourceBuffer;
-    endOfStream(error?: number): void;
-    removeSourceBuffer(sourceBuffer: SourceBuffer): void;
-}
-
-declare var MediaSource: {
-    prototype: MediaSource;
-    new(): MediaSource;
-    isTypeSupported(type: string): boolean;
-};
-
-interface MediaStreamEventMap {
-    "active": Event;
-    "addtrack": MediaStreamTrackEvent;
-    "inactive": Event;
-    "removetrack": MediaStreamTrackEvent;
-}
-
-interface MediaStream extends EventTarget {
-    readonly active: boolean;
-    readonly id: string;
-    onactive: ((this: MediaStream, ev: Event) => any) | null;
-    onaddtrack: ((this: MediaStream, ev: MediaStreamTrackEvent) => any) | null;
-    oninactive: ((this: MediaStream, ev: Event) => any) | null;
-    onremovetrack: ((this: MediaStream, ev: MediaStreamTrackEvent) => any) | null;
-    addTrack(track: MediaStreamTrack): void;
-    clone(): MediaStream;
-    getAudioTracks(): MediaStreamTrack[];
-    getTrackById(trackId: string): MediaStreamTrack | null;
-    getTracks(): MediaStreamTrack[];
-    getVideoTracks(): MediaStreamTrack[];
-    removeTrack(track: MediaStreamTrack): void;
-    stop(): void;
-    addEventListener<K extends keyof MediaStreamEventMap>(type: K, listener: (this: MediaStream, ev: MediaStreamEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof MediaStreamEventMap>(type: K, listener: (this: MediaStream, ev: MediaStreamEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var MediaStream: {
-    prototype: MediaStream;
-    new(): MediaStream;
-    new(stream: MediaStream): MediaStream;
-    new(tracks: MediaStreamTrack[]): MediaStream;
-};
-
-interface MediaStreamAudioSourceNode extends AudioNode {
-}
-
-declare var MediaStreamAudioSourceNode: {
-    prototype: MediaStreamAudioSourceNode;
-    new(): MediaStreamAudioSourceNode;
-};
-
-interface MediaStreamError {
-    readonly constraintName: string | null;
-    readonly message: string | null;
-    readonly name: string;
-}
-
-declare var MediaStreamError: {
-    prototype: MediaStreamError;
-    new(): MediaStreamError;
-};
-
-interface MediaStreamErrorEvent extends Event {
-    readonly error: MediaStreamError | null;
-}
-
-declare var MediaStreamErrorEvent: {
-    prototype: MediaStreamErrorEvent;
-    new(typeArg: string, eventInitDict?: MediaStreamErrorEventInit): MediaStreamErrorEvent;
-};
-
-interface MediaStreamEvent extends Event {
-    readonly stream: MediaStream | null;
-}
-
-declare var MediaStreamEvent: {
-    prototype: MediaStreamEvent;
-    new(type: string, eventInitDict: MediaStreamEventInit): MediaStreamEvent;
-};
-
-interface MediaStreamTrackEventMap {
-    "ended": MediaStreamErrorEvent;
-    "mute": Event;
-    "overconstrained": MediaStreamErrorEvent;
-    "unmute": Event;
-}
-
-interface MediaStreamTrack extends EventTarget {
-    enabled: boolean;
-    readonly id: string;
-    readonly kind: string;
-    readonly label: string;
-    readonly muted: boolean;
-    onended: ((this: MediaStreamTrack, ev: MediaStreamErrorEvent) => any) | null;
-    onmute: ((this: MediaStreamTrack, ev: Event) => any) | null;
-    onoverconstrained: ((this: MediaStreamTrack, ev: MediaStreamErrorEvent) => any) | null;
-    onunmute: ((this: MediaStreamTrack, ev: Event) => any) | null;
-    readonly readonly: boolean;
-    readonly readyState: MediaStreamTrackState;
-    readonly remote: boolean;
-    applyConstraints(constraints: MediaTrackConstraints): Promise<void>;
-    clone(): MediaStreamTrack;
-    getCapabilities(): MediaTrackCapabilities;
-    getConstraints(): MediaTrackConstraints;
-    getSettings(): MediaTrackSettings;
-    stop(): void;
-    addEventListener<K extends keyof MediaStreamTrackEventMap>(type: K, listener: (this: MediaStreamTrack, ev: MediaStreamTrackEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof MediaStreamTrackEventMap>(type: K, listener: (this: MediaStreamTrack, ev: MediaStreamTrackEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var MediaStreamTrack: {
-    prototype: MediaStreamTrack;
-    new(): MediaStreamTrack;
-};
-
-interface MediaStreamTrackEvent extends Event {
-    readonly track: MediaStreamTrack;
-}
-
-declare var MediaStreamTrackEvent: {
-    prototype: MediaStreamTrackEvent;
-    new(typeArg: string, eventInitDict?: MediaStreamTrackEventInit): MediaStreamTrackEvent;
-};
-
-interface MessageChannel {
-    readonly port1: MessagePort;
-    readonly port2: MessagePort;
-}
-
-declare var MessageChannel: {
-    prototype: MessageChannel;
-    new(): MessageChannel;
-};
-
-interface MessageEvent extends Event {
-    readonly data: any;
-    readonly origin: string;
-    readonly ports: ReadonlyArray<MessagePort>;
-    readonly source: Window | null;
-    initMessageEvent(type: string, bubbles: boolean, cancelable: boolean, data: any, origin: string, lastEventId: string, source: Window): void;
-}
-
-declare var MessageEvent: {
-    prototype: MessageEvent;
-    new(type: string, eventInitDict?: MessageEventInit): MessageEvent;
-};
-
-interface MessagePortEventMap {
-    "message": MessageEvent;
-}
-
-interface MessagePort extends EventTarget {
-    onmessage: ((this: MessagePort, ev: MessageEvent) => any) | null;
-    close(): void;
-    postMessage(message?: any, transfer?: any[]): void;
-    start(): void;
-    addEventListener<K extends keyof MessagePortEventMap>(type: K, listener: (this: MessagePort, ev: MessagePortEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof MessagePortEventMap>(type: K, listener: (this: MessagePort, ev: MessagePortEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var MessagePort: {
-    prototype: MessagePort;
-    new(): MessagePort;
-};
-
-interface MimeType {
-    readonly description: string;
-    readonly enabledPlugin: Plugin;
-    readonly suffixes: string;
-    readonly type: string;
-}
-
-declare var MimeType: {
-    prototype: MimeType;
-    new(): MimeType;
-};
-
-interface MimeTypeArray {
-    readonly length: number;
-    item(index: number): Plugin;
-    namedItem(type: string): Plugin;
-    [index: number]: Plugin;
-}
-
-declare var MimeTypeArray: {
-    prototype: MimeTypeArray;
-    new(): MimeTypeArray;
-};
-
-interface MouseEvent extends UIEvent {
-    readonly altKey: boolean;
-    readonly button: number;
-    readonly buttons: number;
-    readonly clientX: number;
-    readonly clientY: number;
-    readonly ctrlKey: boolean;
-    /** @deprecated */
-    readonly fromElement: Element;
-    readonly layerX: number;
-    readonly layerY: number;
-    readonly metaKey: boolean;
-    readonly movementX: number;
-    readonly movementY: number;
-    readonly offsetX: number;
-    readonly offsetY: number;
-    readonly pageX: number;
-    readonly pageY: number;
-    readonly relatedTarget: EventTarget;
-    readonly screenX: number;
-    readonly screenY: number;
-    readonly shiftKey: boolean;
-    /** @deprecated */
-    readonly toElement: Element;
-    /** @deprecated */
-    readonly which: number;
-    readonly x: number;
-    readonly y: number;
-    getModifierState(keyArg: string): boolean;
-    initMouseEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number, screenXArg: number, screenYArg: number, clientXArg: number, clientYArg: number, ctrlKeyArg: boolean, altKeyArg: boolean, shiftKeyArg: boolean, metaKeyArg: boolean, buttonArg: number, relatedTargetArg: EventTarget | null): void;
-}
-
-declare var MouseEvent: {
-    prototype: MouseEvent;
-    new(typeArg: string, eventInitDict?: MouseEventInit): MouseEvent;
-};
-
-interface MutationEvent extends Event {
-    readonly attrChange: number;
-    readonly attrName: string;
-    readonly newValue: string;
-    readonly prevValue: string;
-    readonly relatedNode: Node;
-    initMutationEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, relatedNodeArg: Node, prevValueArg: string, newValueArg: string, attrNameArg: string, attrChangeArg: number): void;
-    readonly ADDITION: number;
-    readonly MODIFICATION: number;
-    readonly REMOVAL: number;
-}
-
-declare var MutationEvent: {
-    prototype: MutationEvent;
-    new(): MutationEvent;
-    readonly ADDITION: number;
-    readonly MODIFICATION: number;
-    readonly REMOVAL: number;
-};
-
-interface MutationObserver {
-    disconnect(): void;
-    observe(target: Node, options: MutationObserverInit): void;
-    takeRecords(): MutationRecord[];
-}
-
-declare var MutationObserver: {
-    prototype: MutationObserver;
-    new(callback: MutationCallback): MutationObserver;
-};
-
-interface MutationRecord {
-    readonly addedNodes: NodeList;
-    readonly attributeName: string | null;
-    readonly attributeNamespace: string | null;
-    readonly nextSibling: Node | null;
-    readonly oldValue: string | null;
-    readonly previousSibling: Node | null;
-    readonly removedNodes: NodeList;
-    readonly target: Node;
-    readonly type: MutationRecordType;
-}
-
-declare var MutationRecord: {
-    prototype: MutationRecord;
-    new(): MutationRecord;
-};
-
-interface NamedNodeMap {
-    readonly length: number;
-    getNamedItem(qualifiedName: string): Attr | null;
-    getNamedItemNS(namespace: string | null, localName: string): Attr | null;
-    item(index: number): Attr | null;
-    removeNamedItem(qualifiedName: string): Attr;
-    removeNamedItemNS(namespace: string | null, localName: string): Attr;
-    setNamedItem(attr: Attr): Attr | null;
-    setNamedItemNS(attr: Attr): Attr | null;
-    [index: number]: Attr;
-}
-
-declare var NamedNodeMap: {
-    prototype: NamedNodeMap;
-    new(): NamedNodeMap;
-};
-
-interface Navigator extends NavigatorID, NavigatorOnLine, NavigatorContentUtils, NavigatorStorageUtils, MSNavigatorDoNotTrack, MSFileSaver, NavigatorBeacon, NavigatorConcurrentHardware, NavigatorUserMedia, NavigatorLanguage {
-    readonly activeVRDisplays: ReadonlyArray<VRDisplay>;
-    readonly authentication: WebAuthentication;
-    readonly cookieEnabled: boolean;
-    readonly doNotTrack: string | null;
-    gamepadInputEmulation: GamepadInputEmulationType;
-    readonly geolocation: Geolocation;
-    readonly maxTouchPoints: number;
-    readonly mimeTypes: MimeTypeArray;
-    readonly msManipulationViewsEnabled: boolean;
-    readonly msMaxTouchPoints: number;
-    readonly msPointerEnabled: boolean;
-    readonly plugins: PluginArray;
-    readonly pointerEnabled: boolean;
-    readonly serviceWorker: ServiceWorkerContainer;
-    readonly webdriver: boolean;
-    getGamepads(): (Gamepad | null)[];
-    getVRDisplays(): Promise<VRDisplay[]>;
-    javaEnabled(): boolean;
-    msLaunchUri(uri: string, successCallback?: MSLaunchUriCallback, noHandlerCallback?: MSLaunchUriCallback): void;
-    requestMediaKeySystemAccess(keySystem: string, supportedConfigurations: MediaKeySystemConfiguration[]): Promise<MediaKeySystemAccess>;
-    vibrate(pattern: number | number[]): boolean;
-}
-
-declare var Navigator: {
-    prototype: Navigator;
-    new(): Navigator;
-};
-
-interface NavigatorBeacon {
-    sendBeacon(url: string, data?: Blob | Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | FormData | string | null): boolean;
-}
-
-interface NavigatorConcurrentHardware {
-    readonly hardwareConcurrency: number;
-}
-
-interface NavigatorContentUtils {
-}
-
-interface NavigatorID {
-    readonly appCodeName: string;
-    readonly appName: string;
-    readonly appVersion: string;
-    readonly platform: string;
-    readonly product: string;
-    readonly productSub: string;
-    readonly userAgent: string;
-    readonly vendor: string;
-    readonly vendorSub: string;
-}
-
-interface NavigatorLanguage {
-    readonly language: string;
-    readonly languages: ReadonlyArray<string>;
-}
-
-interface NavigatorOnLine {
-    readonly onLine: boolean;
-}
-
-interface NavigatorStorageUtils {
-}
-
-interface NavigatorUserMedia {
-    readonly mediaDevices: MediaDevices;
-    getDisplayMedia(constraints: MediaStreamConstraints): Promise<MediaStream>;
-    getUserMedia(constraints: MediaStreamConstraints, successCallback: NavigatorUserMediaSuccessCallback, errorCallback: NavigatorUserMediaErrorCallback): void;
-}
-
-interface Node extends EventTarget {
-    readonly baseURI: string | null;
-    readonly childNodes: NodeListOf<Node & ChildNode>;
-    readonly firstChild: Node | null;
-    readonly isConnected: boolean;
-    readonly lastChild: Node | null;
-    readonly localName: string | null;
-    readonly namespaceURI: string | null;
-    readonly nextSibling: Node | null;
-    readonly nodeName: string;
-    readonly nodeType: number;
-    nodeValue: string | null;
-    readonly ownerDocument: Document;
-    readonly parentElement: HTMLElement | null;
-    readonly parentNode: Node | null;
-    readonly previousSibling: Node | null;
-    textContent: string | null;
-    appendChild<T extends Node>(newChild: T): T;
-    cloneNode(deep?: boolean): Node;
-    compareDocumentPosition(other: Node): number;
-    contains(child: Node): boolean;
-    hasChildNodes(): boolean;
-    insertBefore<T extends Node>(newChild: T, refChild: Node | null): T;
-    isDefaultNamespace(namespaceURI: string | null): boolean;
-    isEqualNode(arg: Node): boolean;
-    isSameNode(other: Node): boolean;
-    lookupNamespaceURI(prefix: string | null): string | null;
-    lookupPrefix(namespaceURI: string | null): string | null;
-    normalize(): void;
-    removeChild<T extends Node>(oldChild: T): T;
-    replaceChild<T extends Node>(newChild: Node, oldChild: T): T;
-    readonly ATTRIBUTE_NODE: number;
-    readonly CDATA_SECTION_NODE: number;
-    readonly COMMENT_NODE: number;
-    readonly DOCUMENT_FRAGMENT_NODE: number;
-    readonly DOCUMENT_NODE: number;
-    readonly DOCUMENT_POSITION_CONTAINED_BY: number;
-    readonly DOCUMENT_POSITION_CONTAINS: number;
-    readonly DOCUMENT_POSITION_DISCONNECTED: number;
-    readonly DOCUMENT_POSITION_FOLLOWING: number;
-    readonly DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC: number;
-    readonly DOCUMENT_POSITION_PRECEDING: number;
-    readonly DOCUMENT_TYPE_NODE: number;
-    readonly ELEMENT_NODE: number;
-    readonly ENTITY_NODE: number;
-    readonly ENTITY_REFERENCE_NODE: number;
-    readonly NOTATION_NODE: number;
-    readonly PROCESSING_INSTRUCTION_NODE: number;
-    readonly TEXT_NODE: number;
-}
-
-declare var Node: {
-    prototype: Node;
-    new(): Node;
-    readonly ATTRIBUTE_NODE: number;
-    readonly CDATA_SECTION_NODE: number;
-    readonly COMMENT_NODE: number;
-    readonly DOCUMENT_FRAGMENT_NODE: number;
-    readonly DOCUMENT_NODE: number;
-    readonly DOCUMENT_POSITION_CONTAINED_BY: number;
-    readonly DOCUMENT_POSITION_CONTAINS: number;
-    readonly DOCUMENT_POSITION_DISCONNECTED: number;
-    readonly DOCUMENT_POSITION_FOLLOWING: number;
-    readonly DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC: number;
-    readonly DOCUMENT_POSITION_PRECEDING: number;
-    readonly DOCUMENT_TYPE_NODE: number;
-    readonly ELEMENT_NODE: number;
-    readonly ENTITY_NODE: number;
-    readonly ENTITY_REFERENCE_NODE: number;
-    readonly NOTATION_NODE: number;
-    readonly PROCESSING_INSTRUCTION_NODE: number;
-    readonly TEXT_NODE: number;
-};
-
-interface NodeFilter {
-    acceptNode(node: Node): number;
-}
-
-declare var NodeFilter: {
-    readonly FILTER_ACCEPT: number;
-    readonly FILTER_REJECT: number;
-    readonly FILTER_SKIP: number;
-    readonly SHOW_ALL: number;
-    readonly SHOW_ATTRIBUTE: number;
-    readonly SHOW_CDATA_SECTION: number;
-    readonly SHOW_COMMENT: number;
-    readonly SHOW_DOCUMENT: number;
-    readonly SHOW_DOCUMENT_FRAGMENT: number;
-    readonly SHOW_DOCUMENT_TYPE: number;
-    readonly SHOW_ELEMENT: number;
-    readonly SHOW_ENTITY: number;
-    readonly SHOW_ENTITY_REFERENCE: number;
-    readonly SHOW_NOTATION: number;
-    readonly SHOW_PROCESSING_INSTRUCTION: number;
-    readonly SHOW_TEXT: number;
-};
-
-interface NodeIterator {
-    /** @deprecated */
-    readonly expandEntityReferences: boolean;
-    readonly filter: NodeFilter | null;
-    readonly root: Node;
-    readonly whatToShow: number;
-    detach(): void;
-    nextNode(): Node | null;
-    previousNode(): Node | null;
-}
-
-declare var NodeIterator: {
-    prototype: NodeIterator;
-    new(): NodeIterator;
-};
-
-interface NodeList {
-    readonly length: number;
-    item(index: number): Node;
-    [index: number]: Node;
-}
-
-declare var NodeList: {
-    prototype: NodeList;
-    new(): NodeList;
-};
-
-interface NodeListOf<TNode extends Node> extends NodeList {
-    length: number;
-    item(index: number): TNode;
-    [index: number]: TNode;
-}
-
-interface NodeSelector {
-    querySelector<K extends keyof HTMLElementTagNameMap>(selectors: K): HTMLElementTagNameMap[K] | null;
-    querySelector<K extends keyof SVGElementTagNameMap>(selectors: K): SVGElementTagNameMap[K] | null;
-    querySelector<E extends Element = Element>(selectors: string): E | null;
-    querySelectorAll<K extends keyof HTMLElementTagNameMap>(selectors: K): NodeListOf<HTMLElementTagNameMap[K]>;
-    querySelectorAll<K extends keyof SVGElementTagNameMap>(selectors: K): NodeListOf<SVGElementTagNameMap[K]>;
-    querySelectorAll<E extends Element = Element>(selectors: string): NodeListOf<E>;
-}
-
-interface NotificationEventMap {
-    "click": Event;
-    "close": Event;
-    "error": Event;
-    "show": Event;
-}
-
-interface Notification extends EventTarget {
-    readonly body: string | null;
-    readonly data: any;
-    readonly dir: NotificationDirection;
-    readonly icon: string | null;
-    readonly lang: string | null;
-    onclick: ((this: Notification, ev: Event) => any) | null;
-    onclose: ((this: Notification, ev: Event) => any) | null;
-    onerror: ((this: Notification, ev: Event) => any) | null;
-    onshow: ((this: Notification, ev: Event) => any) | null;
-    readonly permission: NotificationPermission;
-    readonly tag: string | null;
-    readonly title: string;
-    close(): void;
-    addEventListener<K extends keyof NotificationEventMap>(type: K, listener: (this: Notification, ev: NotificationEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof NotificationEventMap>(type: K, listener: (this: Notification, ev: NotificationEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var Notification: {
-    prototype: Notification;
-    new(title: string, options?: NotificationOptions): Notification;
-    requestPermission(callback?: NotificationPermissionCallback): Promise<NotificationPermission>;
-};
-
-interface OES_element_index_uint {
-}
-
-declare var OES_element_index_uint: {
-    prototype: OES_element_index_uint;
-    new(): OES_element_index_uint;
-};
-
-interface OES_standard_derivatives {
-    readonly FRAGMENT_SHADER_DERIVATIVE_HINT_OES: number;
-}
-
-declare var OES_standard_derivatives: {
-    prototype: OES_standard_derivatives;
-    new(): OES_standard_derivatives;
-    readonly FRAGMENT_SHADER_DERIVATIVE_HINT_OES: number;
-};
-
-interface OES_texture_float {
-}
-
-declare var OES_texture_float: {
-    prototype: OES_texture_float;
-    new(): OES_texture_float;
-};
-
-interface OES_texture_float_linear {
-}
-
-declare var OES_texture_float_linear: {
-    prototype: OES_texture_float_linear;
-    new(): OES_texture_float_linear;
-};
-
-interface OES_texture_half_float {
-    readonly HALF_FLOAT_OES: number;
-}
-
-declare var OES_texture_half_float: {
-    prototype: OES_texture_half_float;
-    new(): OES_texture_half_float;
-    readonly HALF_FLOAT_OES: number;
-};
-
-interface OES_texture_half_float_linear {
-}
-
-declare var OES_texture_half_float_linear: {
-    prototype: OES_texture_half_float_linear;
-    new(): OES_texture_half_float_linear;
-};
-
-interface OES_vertex_array_object {
-    readonly VERTEX_ARRAY_BINDING_OES: number;
-    bindVertexArrayOES(arrayObject: WebGLVertexArrayObjectOES): void;
-    createVertexArrayOES(): WebGLVertexArrayObjectOES;
-    deleteVertexArrayOES(arrayObject: WebGLVertexArrayObjectOES): void;
-    isVertexArrayOES(value: any): value is WebGLVertexArrayObjectOES;
-}
-
-interface OfflineAudioCompletionEvent extends Event {
-    readonly renderedBuffer: AudioBuffer;
-}
-
-declare var OfflineAudioCompletionEvent: {
-    prototype: OfflineAudioCompletionEvent;
-    new(): OfflineAudioCompletionEvent;
-};
-
-interface OfflineAudioContextEventMap extends AudioContextEventMap {
-    "complete": OfflineAudioCompletionEvent;
-}
-
-interface OfflineAudioContext extends AudioContextBase {
-    readonly length: number;
-    oncomplete: ((this: OfflineAudioContext, ev: OfflineAudioCompletionEvent) => any) | null;
-    startRendering(): Promise<AudioBuffer>;
-    suspend(suspendTime: number): Promise<void>;
-    addEventListener<K extends keyof OfflineAudioContextEventMap>(type: K, listener: (this: OfflineAudioContext, ev: OfflineAudioContextEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof OfflineAudioContextEventMap>(type: K, listener: (this: OfflineAudioContext, ev: OfflineAudioContextEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var OfflineAudioContext: {
-    prototype: OfflineAudioContext;
-    new(numberOfChannels: number, length: number, sampleRate: number): OfflineAudioContext;
-};
-
-interface OscillatorNodeEventMap {
-    "ended": Event;
-}
-
-interface OscillatorNode extends AudioNode {
-    readonly detune: AudioParam;
-    readonly frequency: AudioParam;
-    onended: ((this: OscillatorNode, ev: Event) => any) | null;
-    type: OscillatorType;
-    setPeriodicWave(periodicWave: PeriodicWave): void;
-    start(when?: number): void;
-    stop(when?: number): void;
-    addEventListener<K extends keyof OscillatorNodeEventMap>(type: K, listener: (this: OscillatorNode, ev: OscillatorNodeEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof OscillatorNodeEventMap>(type: K, listener: (this: OscillatorNode, ev: OscillatorNodeEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var OscillatorNode: {
-    prototype: OscillatorNode;
-    new(): OscillatorNode;
-};
-
-interface OverflowEvent extends UIEvent {
-    readonly horizontalOverflow: boolean;
-    readonly orient: number;
-    readonly verticalOverflow: boolean;
-    readonly BOTH: number;
-    readonly HORIZONTAL: number;
-    readonly VERTICAL: number;
-}
-
-declare var OverflowEvent: {
-    prototype: OverflowEvent;
-    new(): OverflowEvent;
-    readonly BOTH: number;
-    readonly HORIZONTAL: number;
-    readonly VERTICAL: number;
-};
-
-interface PageTransitionEvent extends Event {
-    readonly persisted: boolean;
-}
-
-declare var PageTransitionEvent: {
-    prototype: PageTransitionEvent;
-    new(): PageTransitionEvent;
-};
-
-interface PannerNode extends AudioNode {
-    coneInnerAngle: number;
-    coneOuterAngle: number;
-    coneOuterGain: number;
-    distanceModel: DistanceModelType;
-    maxDistance: number;
-    panningModel: PanningModelType;
-    refDistance: number;
-    rolloffFactor: number;
-    /** @deprecated */
-    setOrientation(x: number, y: number, z: number): void;
-    /** @deprecated */
-    setPosition(x: number, y: number, z: number): void;
-    /** @deprecated */
-    setVelocity(x: number, y: number, z: number): void;
-}
-
-declare var PannerNode: {
-    prototype: PannerNode;
-    new(): PannerNode;
-};
-
-interface ParentNode {
-    readonly childElementCount: number;
-    readonly firstElementChild: Element | null;
-    readonly lastElementChild: Element | null;
-}
-
-interface ParentNode {
-    readonly children: HTMLCollection;
-    querySelector<K extends keyof HTMLElementTagNameMap>(selectors: K): HTMLElementTagNameMap[K] | null;
-    querySelector<K extends keyof SVGElementTagNameMap>(selectors: K): SVGElementTagNameMap[K] | null;
-    querySelector<E extends Element = Element>(selectors: string): E | null;
-    querySelectorAll<K extends keyof HTMLElementTagNameMap>(selectors: K): NodeListOf<HTMLElementTagNameMap[K]>;
-    querySelectorAll<K extends keyof SVGElementTagNameMap>(selectors: K): NodeListOf<SVGElementTagNameMap[K]>;
-    querySelectorAll<E extends Element = Element>(selectors: string): NodeListOf<E>;
-}
-
-interface Path2D extends CanvasPathMethods {
-}
-
-declare var Path2D: {
-    prototype: Path2D;
-    new(d?: Path2D | string): Path2D;
-};
-
-interface PaymentAddress {
-    readonly addressLine: string[];
-    readonly city: string;
-    readonly country: string;
-    readonly dependentLocality: string;
-    readonly languageCode: string;
-    readonly organization: string;
-    readonly phone: string;
-    readonly postalCode: string;
-    readonly recipient: string;
-    readonly region: string;
-    readonly sortingCode: string;
-    toJSON(): any;
-}
-
-declare var PaymentAddress: {
-    prototype: PaymentAddress;
-    new(): PaymentAddress;
-};
-
-interface PaymentRequestEventMap {
-    "shippingaddresschange": Event;
-    "shippingoptionchange": Event;
-}
-
-interface PaymentRequest extends EventTarget {
-    readonly id: string;
-    onshippingaddresschange: ((this: PaymentRequest, ev: Event) => any) | null;
-    onshippingoptionchange: ((this: PaymentRequest, ev: Event) => any) | null;
-    readonly shippingAddress: PaymentAddress | null;
-    readonly shippingOption: string | null;
-    readonly shippingType: PaymentShippingType | null;
-    abort(): Promise<void>;
-    canMakePayment(): Promise<boolean>;
-    show(): Promise<PaymentResponse>;
-    addEventListener<K extends keyof PaymentRequestEventMap>(type: K, listener: (this: PaymentRequest, ev: PaymentRequestEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof PaymentRequestEventMap>(type: K, listener: (this: PaymentRequest, ev: PaymentRequestEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var PaymentRequest: {
-    prototype: PaymentRequest;
-    new(methodData: PaymentMethodData[], details: PaymentDetailsInit, options?: PaymentOptions): PaymentRequest;
-};
-
-interface PaymentRequestUpdateEvent extends Event {
-    updateWith(detailsPromise: Promise<PaymentDetailsUpdate>): void;
-}
-
-declare var PaymentRequestUpdateEvent: {
-    prototype: PaymentRequestUpdateEvent;
-    new(type: string, eventInitDict?: PaymentRequestUpdateEventInit): PaymentRequestUpdateEvent;
-};
-
-interface PaymentResponse {
-    readonly details: any;
-    readonly methodName: string;
-    readonly payerEmail: string | null;
-    readonly payerName: string | null;
-    readonly payerPhone: string | null;
-    readonly requestId: string;
-    readonly shippingAddress: PaymentAddress | null;
-    readonly shippingOption: string | null;
-    complete(result?: PaymentComplete): Promise<void>;
-    toJSON(): any;
-}
-
-declare var PaymentResponse: {
-    prototype: PaymentResponse;
-    new(): PaymentResponse;
-};
-
-interface PerfWidgetExternal {
-    readonly activeNetworkRequestCount: number;
-    readonly averageFrameTime: number;
-    readonly averagePaintTime: number;
-    readonly extraInformationEnabled: boolean;
-    readonly independentRenderingEnabled: boolean;
-    readonly irDisablingContentString: string;
-    readonly irStatusAvailable: boolean;
-    readonly maxCpuSpeed: number;
-    readonly paintRequestsPerSecond: number;
-    readonly performanceCounter: number;
-    readonly performanceCounterFrequency: number;
-    addEventListener(eventType: string, callback: Function): void;
-    getMemoryUsage(): number;
-    getProcessCpuUsage(): number;
-    getRecentCpuUsage(last: number | null): any;
-    getRecentFrames(last: number | null): any;
-    getRecentMemoryUsage(last: number | null): any;
-    getRecentPaintRequests(last: number | null): any;
-    removeEventListener(eventType: string, callback: Function): void;
-    repositionWindow(x: number, y: number): void;
-    resizeWindow(width: number, height: number): void;
-}
-
-declare var PerfWidgetExternal: {
-    prototype: PerfWidgetExternal;
-    new(): PerfWidgetExternal;
-};
-
-interface Performance {
-    /** @deprecated */
-    readonly navigation: PerformanceNavigation;
-    readonly timeOrigin: number;
-    /** @deprecated */
-    readonly timing: PerformanceTiming;
-    clearMarks(markName?: string): void;
-    clearMeasures(measureName?: string): void;
-    clearResourceTimings(): void;
-    getEntries(): any;
-    getEntriesByName(name: string, type?: string): any;
-    getEntriesByType(type: string): any;
-    /** @deprecated */
-    getMarks(markName?: string): any;
-    /** @deprecated */
-    getMeasures(measureName?: string): any;
-    mark(markName: string): void;
-    measure(measureName: string, startMarkName?: string, endMarkName?: string): void;
-    now(): number;
-    setResourceTimingBufferSize(maxSize: number): void;
-    toJSON(): any;
-}
-
-declare var Performance: {
-    prototype: Performance;
-    new(): Performance;
-};
-
-interface PerformanceEntry {
-    readonly duration: number;
-    readonly entryType: string;
-    readonly name: string;
-    readonly startTime: number;
-    toJSON(): any;
-}
-
-declare var PerformanceEntry: {
-    prototype: PerformanceEntry;
-    new(): PerformanceEntry;
-};
-
-interface PerformanceMark extends PerformanceEntry {
-}
-
-declare var PerformanceMark: {
-    prototype: PerformanceMark;
-    new(): PerformanceMark;
-};
-
-interface PerformanceMeasure extends PerformanceEntry {
-}
-
-declare var PerformanceMeasure: {
-    prototype: PerformanceMeasure;
-    new(): PerformanceMeasure;
-};
-
-interface PerformanceNavigation {
-    readonly redirectCount: number;
-    readonly type: number;
-    toJSON(): any;
-    readonly TYPE_BACK_FORWARD: number;
-    readonly TYPE_NAVIGATE: number;
-    readonly TYPE_RELOAD: number;
-    readonly TYPE_RESERVED: number;
-}
-
-declare var PerformanceNavigation: {
-    prototype: PerformanceNavigation;
-    new(): PerformanceNavigation;
-    readonly TYPE_BACK_FORWARD: number;
-    readonly TYPE_NAVIGATE: number;
-    readonly TYPE_RELOAD: number;
-    readonly TYPE_RESERVED: number;
-};
-
-interface PerformanceNavigationTiming extends PerformanceEntry {
-    /** @deprecated */
-    readonly connectEnd: number;
-    /** @deprecated */
-    readonly connectStart: number;
-    readonly domComplete: number;
-    readonly domContentLoadedEventEnd: number;
-    readonly domContentLoadedEventStart: number;
-    readonly domInteractive: number;
-    /** @deprecated */
-    readonly domLoading: number;
-    /** @deprecated */
-    readonly domainLookupEnd: number;
-    /** @deprecated */
-    readonly domainLookupStart: number;
-    /** @deprecated */
-    readonly fetchStart: number;
-    readonly loadEventEnd: number;
-    readonly loadEventStart: number;
-    /** @deprecated */
-    readonly navigationStart: number;
-    readonly redirectCount: number;
-    /** @deprecated */
-    readonly redirectEnd: number;
-    /** @deprecated */
-    readonly redirectStart: number;
-    /** @deprecated */
-    readonly requestStart: number;
-    /** @deprecated */
-    readonly responseEnd: number;
-    /** @deprecated */
-    readonly responseStart: number;
-    readonly type: NavigationType;
-    readonly unloadEventEnd: number;
-    readonly unloadEventStart: number;
-    readonly workerStart: number;
-}
-
-declare var PerformanceNavigationTiming: {
-    prototype: PerformanceNavigationTiming;
-    new(): PerformanceNavigationTiming;
-};
-
-interface PerformanceResourceTiming extends PerformanceEntry {
-    readonly connectEnd: number;
-    readonly connectStart: number;
-    readonly domainLookupEnd: number;
-    readonly domainLookupStart: number;
-    readonly fetchStart: number;
-    readonly initiatorType: string;
-    readonly redirectEnd: number;
-    readonly redirectStart: number;
-    readonly requestStart: number;
-    readonly responseEnd: number;
-    readonly responseStart: number;
-    readonly workerStart: number;
-}
-
-declare var PerformanceResourceTiming: {
-    prototype: PerformanceResourceTiming;
-    new(): PerformanceResourceTiming;
-};
-
-interface PerformanceTiming {
-    readonly connectEnd: number;
-    readonly connectStart: number;
-    readonly domComplete: number;
-    readonly domContentLoadedEventEnd: number;
-    readonly domContentLoadedEventStart: number;
-    readonly domInteractive: number;
-    readonly domLoading: number;
-    readonly domainLookupEnd: number;
-    readonly domainLookupStart: number;
-    readonly fetchStart: number;
-    readonly loadEventEnd: number;
-    readonly loadEventStart: number;
-    readonly msFirstPaint: number;
-    readonly navigationStart: number;
-    readonly redirectEnd: number;
-    readonly redirectStart: number;
-    readonly requestStart: number;
-    readonly responseEnd: number;
-    readonly responseStart: number;
-    readonly secureConnectionStart: number;
-    readonly unloadEventEnd: number;
-    readonly unloadEventStart: number;
-    toJSON(): any;
-}
-
-declare var PerformanceTiming: {
-    prototype: PerformanceTiming;
-    new(): PerformanceTiming;
-};
-
-interface PeriodicWave {
-}
-
-declare var PeriodicWave: {
-    prototype: PeriodicWave;
-    new(): PeriodicWave;
-};
-
-interface PermissionRequest extends DeferredPermissionRequest {
-    readonly state: MSWebViewPermissionState;
-    defer(): void;
-}
-
-declare var PermissionRequest: {
-    prototype: PermissionRequest;
-    new(): PermissionRequest;
-};
-
-interface PermissionRequestedEvent extends Event {
-    readonly permissionRequest: PermissionRequest;
-}
-
-declare var PermissionRequestedEvent: {
-    prototype: PermissionRequestedEvent;
-    new(): PermissionRequestedEvent;
-};
-
-interface Plugin {
-    readonly description: string;
-    readonly filename: string;
-    readonly length: number;
-    readonly name: string;
-    readonly version: string;
-    item(index: number): MimeType;
-    namedItem(type: string): MimeType;
-    [index: number]: MimeType;
-}
-
-declare var Plugin: {
-    prototype: Plugin;
-    new(): Plugin;
-};
-
-interface PluginArray {
-    readonly length: number;
-    item(index: number): Plugin;
-    namedItem(name: string): Plugin;
-    refresh(reload?: boolean): void;
-    [index: number]: Plugin;
-}
-
-declare var PluginArray: {
-    prototype: PluginArray;
-    new(): PluginArray;
-};
-
-interface PointerEvent extends MouseEvent {
-    readonly currentPoint: any;
-    readonly height: number;
-    readonly hwTimestamp: number;
-    readonly intermediatePoints: any;
-    readonly isPrimary: boolean;
-    readonly pointerId: number;
-    readonly pointerType: any;
-    readonly pressure: number;
-    readonly rotation: number;
-    readonly tiltX: number;
-    readonly tiltY: number;
-    readonly width: number;
-    getCurrentPoint(element: Element): void;
-    getIntermediatePoints(element: Element): void;
-    initPointerEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number, screenXArg: number, screenYArg: number, clientXArg: number, clientYArg: number, ctrlKeyArg: boolean, altKeyArg: boolean, shiftKeyArg: boolean, metaKeyArg: boolean, buttonArg: number, relatedTargetArg: EventTarget, offsetXArg: number, offsetYArg: number, widthArg: number, heightArg: number, pressure: number, rotation: number, tiltX: number, tiltY: number, pointerIdArg: number, pointerType: any, hwTimestampArg: number, isPrimary: boolean): void;
-}
-
-declare var PointerEvent: {
-    prototype: PointerEvent;
-    new(typeArg: string, eventInitDict?: PointerEventInit): PointerEvent;
-};
-
-interface PopStateEvent extends Event {
-    readonly state: any;
-}
-
-declare var PopStateEvent: {
-    prototype: PopStateEvent;
-    new(type: string, eventInitDict?: PopStateEventInit): PopStateEvent;
-};
-
-interface Position {
-    readonly coords: Coordinates;
-    readonly timestamp: number;
-}
-
-declare var Position: {
-    prototype: Position;
-    new(): Position;
-};
-
-interface PositionError {
-    readonly code: number;
-    readonly message: string;
-    toString(): string;
-    readonly PERMISSION_DENIED: number;
-    readonly POSITION_UNAVAILABLE: number;
-    readonly TIMEOUT: number;
-}
-
-declare var PositionError: {
-    prototype: PositionError;
-    new(): PositionError;
-    readonly PERMISSION_DENIED: number;
-    readonly POSITION_UNAVAILABLE: number;
-    readonly TIMEOUT: number;
-};
-
-interface ProcessingInstruction extends CharacterData {
-    readonly target: string;
-}
-
-declare var ProcessingInstruction: {
-    prototype: ProcessingInstruction;
-    new(): ProcessingInstruction;
-};
-
-interface ProgressEvent extends Event {
-    readonly lengthComputable: boolean;
-    readonly loaded: number;
-    readonly total: number;
-    initProgressEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, lengthComputableArg: boolean, loadedArg: number, totalArg: number): void;
-}
-
-declare var ProgressEvent: {
-    prototype: ProgressEvent;
-    new(typeArg: string, eventInitDict?: ProgressEventInit): ProgressEvent;
-};
-
-interface PromiseRejectionEvent extends Event {
-    readonly promise: PromiseLike<any>;
-    readonly reason: any;
-}
-
-interface PromiseRejectionEventInit extends EventInit {
-    promise: PromiseLike<any>;
-    reason?: any;
-}
-
-interface PushManager {
-    readonly supportedContentEncodings: ReadonlyArray<string>;
-    getSubscription(): Promise<PushSubscription | null>;
-    permissionState(options?: PushSubscriptionOptionsInit): Promise<PushPermissionState>;
-    subscribe(options?: PushSubscriptionOptionsInit): Promise<PushSubscription>;
-}
-
-declare var PushManager: {
-    prototype: PushManager;
-    new(): PushManager;
-};
-
-interface PushSubscription {
-    readonly endpoint: string;
-    readonly expirationTime: number | null;
-    readonly options: PushSubscriptionOptions;
-    getKey(name: PushEncryptionKeyName): ArrayBuffer | null;
-    toJSON(): any;
-    unsubscribe(): Promise<boolean>;
-}
-
-declare var PushSubscription: {
-    prototype: PushSubscription;
-    new(): PushSubscription;
-};
-
-interface PushSubscriptionOptions {
-    readonly applicationServerKey: ArrayBuffer | null;
-    readonly userVisibleOnly: boolean;
-}
-
-declare var PushSubscriptionOptions: {
-    prototype: PushSubscriptionOptions;
-    new(): PushSubscriptionOptions;
-};
-
-interface RTCDTMFToneChangeEvent extends Event {
-    readonly tone: string;
-}
-
-declare var RTCDTMFToneChangeEvent: {
-    prototype: RTCDTMFToneChangeEvent;
-    new(typeArg: string, eventInitDict: RTCDTMFToneChangeEventInit): RTCDTMFToneChangeEvent;
-};
-
-interface RTCDtlsTransportEventMap {
-    "dtlsstatechange": RTCDtlsTransportStateChangedEvent;
-    "error": Event;
-}
-
-interface RTCDtlsTransport extends RTCStatsProvider {
-    ondtlsstatechange: ((this: RTCDtlsTransport, ev: RTCDtlsTransportStateChangedEvent) => any) | null;
-    onerror: ((this: RTCDtlsTransport, ev: Event) => any) | null;
-    readonly state: RTCDtlsTransportState;
-    readonly transport: RTCIceTransport;
-    getLocalParameters(): RTCDtlsParameters;
-    getRemoteCertificates(): ArrayBuffer[];
-    getRemoteParameters(): RTCDtlsParameters | null;
-    start(remoteParameters: RTCDtlsParameters): void;
-    stop(): void;
-    addEventListener<K extends keyof RTCDtlsTransportEventMap>(type: K, listener: (this: RTCDtlsTransport, ev: RTCDtlsTransportEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCDtlsTransportEventMap>(type: K, listener: (this: RTCDtlsTransport, ev: RTCDtlsTransportEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var RTCDtlsTransport: {
-    prototype: RTCDtlsTransport;
-    new(transport: RTCIceTransport): RTCDtlsTransport;
-};
-
-interface RTCDtlsTransportStateChangedEvent extends Event {
-    readonly state: RTCDtlsTransportState;
-}
-
-declare var RTCDtlsTransportStateChangedEvent: {
-    prototype: RTCDtlsTransportStateChangedEvent;
-    new(): RTCDtlsTransportStateChangedEvent;
-};
-
-interface RTCDtmfSenderEventMap {
-    "tonechange": RTCDTMFToneChangeEvent;
-}
-
-interface RTCDtmfSender extends EventTarget {
-    readonly canInsertDTMF: boolean;
-    readonly duration: number;
-    readonly interToneGap: number;
-    ontonechange: ((this: RTCDtmfSender, ev: RTCDTMFToneChangeEvent) => any) | null;
-    readonly sender: RTCRtpSender;
-    readonly toneBuffer: string;
-    insertDTMF(tones: string, duration?: number, interToneGap?: number): void;
-    addEventListener<K extends keyof RTCDtmfSenderEventMap>(type: K, listener: (this: RTCDtmfSender, ev: RTCDtmfSenderEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCDtmfSenderEventMap>(type: K, listener: (this: RTCDtmfSender, ev: RTCDtmfSenderEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var RTCDtmfSender: {
-    prototype: RTCDtmfSender;
-    new(sender: RTCRtpSender): RTCDtmfSender;
-};
-
-interface RTCIceCandidate {
-    candidate: string | null;
-    sdpMLineIndex: number | null;
-    sdpMid: string | null;
-    toJSON(): any;
-}
-
-declare var RTCIceCandidate: {
-    prototype: RTCIceCandidate;
-    new(candidateInitDict?: RTCIceCandidateInit): RTCIceCandidate;
-};
-
-interface RTCIceCandidatePairChangedEvent extends Event {
-    readonly pair: RTCIceCandidatePair;
-}
-
-declare var RTCIceCandidatePairChangedEvent: {
-    prototype: RTCIceCandidatePairChangedEvent;
-    new(): RTCIceCandidatePairChangedEvent;
-};
-
-interface RTCIceGathererEventMap {
-    "error": Event;
-    "localcandidate": RTCIceGathererEvent;
-}
-
-interface RTCIceGatherer extends RTCStatsProvider {
-    readonly component: RTCIceComponent;
-    onerror: ((this: RTCIceGatherer, ev: Event) => any) | null;
-    onlocalcandidate: ((this: RTCIceGatherer, ev: RTCIceGathererEvent) => any) | null;
-    createAssociatedGatherer(): RTCIceGatherer;
-    getLocalCandidates(): RTCIceCandidateDictionary[];
-    getLocalParameters(): RTCIceParameters;
-    addEventListener<K extends keyof RTCIceGathererEventMap>(type: K, listener: (this: RTCIceGatherer, ev: RTCIceGathererEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCIceGathererEventMap>(type: K, listener: (this: RTCIceGatherer, ev: RTCIceGathererEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var RTCIceGatherer: {
-    prototype: RTCIceGatherer;
-    new(options: RTCIceGatherOptions): RTCIceGatherer;
-};
-
-interface RTCIceGathererEvent extends Event {
-    readonly candidate: RTCIceCandidateDictionary | RTCIceCandidateComplete;
-}
-
-declare var RTCIceGathererEvent: {
-    prototype: RTCIceGathererEvent;
-    new(): RTCIceGathererEvent;
-};
-
-interface RTCIceTransportEventMap {
-    "candidatepairchange": RTCIceCandidatePairChangedEvent;
-    "icestatechange": RTCIceTransportStateChangedEvent;
-}
-
-interface RTCIceTransport extends RTCStatsProvider {
-    readonly component: RTCIceComponent;
-    readonly iceGatherer: RTCIceGatherer | null;
-    oncandidatepairchange: ((this: RTCIceTransport, ev: RTCIceCandidatePairChangedEvent) => any) | null;
-    onicestatechange: ((this: RTCIceTransport, ev: RTCIceTransportStateChangedEvent) => any) | null;
-    readonly role: RTCIceRole;
-    readonly state: RTCIceTransportState;
-    addRemoteCandidate(remoteCandidate: RTCIceCandidateDictionary | RTCIceCandidateComplete): void;
-    createAssociatedTransport(): RTCIceTransport;
-    getNominatedCandidatePair(): RTCIceCandidatePair | null;
-    getRemoteCandidates(): RTCIceCandidateDictionary[];
-    getRemoteParameters(): RTCIceParameters | null;
-    setRemoteCandidates(remoteCandidates: RTCIceCandidateDictionary[]): void;
-    start(gatherer: RTCIceGatherer, remoteParameters: RTCIceParameters, role?: RTCIceRole): void;
-    stop(): void;
-    addEventListener<K extends keyof RTCIceTransportEventMap>(type: K, listener: (this: RTCIceTransport, ev: RTCIceTransportEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCIceTransportEventMap>(type: K, listener: (this: RTCIceTransport, ev: RTCIceTransportEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var RTCIceTransport: {
-    prototype: RTCIceTransport;
-    new(): RTCIceTransport;
-};
-
-interface RTCIceTransportStateChangedEvent extends Event {
-    readonly state: RTCIceTransportState;
-}
-
-declare var RTCIceTransportStateChangedEvent: {
-    prototype: RTCIceTransportStateChangedEvent;
-    new(): RTCIceTransportStateChangedEvent;
-};
-
-interface RTCPeerConnectionEventMap {
-    "addstream": MediaStreamEvent;
-    "icecandidate": RTCPeerConnectionIceEvent;
-    "iceconnectionstatechange": Event;
-    "icegatheringstatechange": Event;
-    "negotiationneeded": Event;
-    "removestream": MediaStreamEvent;
-    "signalingstatechange": Event;
-}
-
-interface RTCPeerConnection extends EventTarget {
-    readonly canTrickleIceCandidates: boolean | null;
-    readonly iceConnectionState: RTCIceConnectionState;
-    readonly iceGatheringState: RTCIceGatheringState;
-    readonly localDescription: RTCSessionDescription | null;
-    onaddstream: ((this: RTCPeerConnection, ev: MediaStreamEvent) => any) | null;
-    onicecandidate: ((this: RTCPeerConnection, ev: RTCPeerConnectionIceEvent) => any) | null;
-    oniceconnectionstatechange: ((this: RTCPeerConnection, ev: Event) => any) | null;
-    onicegatheringstatechange: ((this: RTCPeerConnection, ev: Event) => any) | null;
-    onnegotiationneeded: ((this: RTCPeerConnection, ev: Event) => any) | null;
-    onremovestream: ((this: RTCPeerConnection, ev: MediaStreamEvent) => any) | null;
-    onsignalingstatechange: ((this: RTCPeerConnection, ev: Event) => any) | null;
-    readonly remoteDescription: RTCSessionDescription | null;
-    readonly signalingState: RTCSignalingState;
-    addIceCandidate(candidate: RTCIceCandidateInit | RTCIceCandidate): Promise<void>;
-    addStream(stream: MediaStream): void;
-    close(): void;
-    createAnswer(options?: RTCOfferOptions): Promise<RTCSessionDescriptionInit>;
-    createOffer(options?: RTCOfferOptions): Promise<RTCSessionDescriptionInit>;
-    getConfiguration(): RTCConfiguration;
-    getLocalStreams(): MediaStream[];
-    getRemoteStreams(): MediaStream[];
-    getStats(selector: MediaStreamTrack | null, successCallback?: RTCStatsCallback, failureCallback?: RTCPeerConnectionErrorCallback): Promise<RTCStatsReport>;
-    getStreamById(streamId: string): MediaStream | null;
-    removeStream(stream: MediaStream): void;
-    setLocalDescription(description: RTCSessionDescriptionInit): Promise<void>;
-    setRemoteDescription(description: RTCSessionDescriptionInit): Promise<void>;
-    addEventListener<K extends keyof RTCPeerConnectionEventMap>(type: K, listener: (this: RTCPeerConnection, ev: RTCPeerConnectionEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCPeerConnectionEventMap>(type: K, listener: (this: RTCPeerConnection, ev: RTCPeerConnectionEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var RTCPeerConnection: {
-    prototype: RTCPeerConnection;
-    new(configuration: RTCConfiguration): RTCPeerConnection;
-};
-
-interface RTCPeerConnectionIceEvent extends Event {
-    readonly candidate: RTCIceCandidate;
-}
-
-declare var RTCPeerConnectionIceEvent: {
-    prototype: RTCPeerConnectionIceEvent;
-    new(type: string, eventInitDict: RTCPeerConnectionIceEventInit): RTCPeerConnectionIceEvent;
-};
-
-interface RTCRtpReceiverEventMap {
-    "error": Event;
-    "msdecodercapacitychange": Event;
-    "msdsh": Event;
-}
-
-interface RTCRtpReceiver extends RTCStatsProvider {
-    onerror: ((this: RTCRtpReceiver, ev: Event) => any) | null;
-    onmsdecodercapacitychange: ((this: RTCRtpReceiver, ev: Event) => any) | null;
-    onmsdsh: ((this: RTCRtpReceiver, ev: Event) => any) | null;
-    readonly rtcpTransport: RTCDtlsTransport;
-    readonly track: MediaStreamTrack | null;
-    readonly transport: RTCDtlsTransport | RTCSrtpSdesTransport;
-    getContributingSources(): RTCRtpContributingSource[];
-    receive(parameters: RTCRtpParameters): void;
-    requestSendCSRC(csrc: number): void;
-    setTransport(transport: RTCDtlsTransport | RTCSrtpSdesTransport, rtcpTransport?: RTCDtlsTransport): void;
-    stop(): void;
-    addEventListener<K extends keyof RTCRtpReceiverEventMap>(type: K, listener: (this: RTCRtpReceiver, ev: RTCRtpReceiverEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCRtpReceiverEventMap>(type: K, listener: (this: RTCRtpReceiver, ev: RTCRtpReceiverEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var RTCRtpReceiver: {
-    prototype: RTCRtpReceiver;
-    new(transport: RTCDtlsTransport | RTCSrtpSdesTransport, kind: string, rtcpTransport?: RTCDtlsTransport): RTCRtpReceiver;
-    getCapabilities(kind?: string): RTCRtpCapabilities;
-};
-
-interface RTCRtpSenderEventMap {
-    "error": Event;
-    "ssrcconflict": RTCSsrcConflictEvent;
-}
-
-interface RTCRtpSender extends RTCStatsProvider {
-    onerror: ((this: RTCRtpSender, ev: Event) => any) | null;
-    onssrcconflict: ((this: RTCRtpSender, ev: RTCSsrcConflictEvent) => any) | null;
-    readonly rtcpTransport: RTCDtlsTransport;
-    readonly track: MediaStreamTrack;
-    readonly transport: RTCDtlsTransport | RTCSrtpSdesTransport;
-    send(parameters: RTCRtpParameters): void;
-    setTrack(track: MediaStreamTrack): void;
-    setTransport(transport: RTCDtlsTransport | RTCSrtpSdesTransport, rtcpTransport?: RTCDtlsTransport): void;
-    stop(): void;
-    addEventListener<K extends keyof RTCRtpSenderEventMap>(type: K, listener: (this: RTCRtpSender, ev: RTCRtpSenderEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCRtpSenderEventMap>(type: K, listener: (this: RTCRtpSender, ev: RTCRtpSenderEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var RTCRtpSender: {
-    prototype: RTCRtpSender;
-    new(track: MediaStreamTrack, transport: RTCDtlsTransport | RTCSrtpSdesTransport, rtcpTransport?: RTCDtlsTransport): RTCRtpSender;
-    getCapabilities(kind?: string): RTCRtpCapabilities;
-};
-
-interface RTCSessionDescription {
-    sdp: string | null;
-    type: RTCSdpType | null;
-    toJSON(): any;
-}
-
-declare var RTCSessionDescription: {
-    prototype: RTCSessionDescription;
-    new(descriptionInitDict?: RTCSessionDescriptionInit): RTCSessionDescription;
-};
-
-interface RTCSrtpSdesTransportEventMap {
-    "error": Event;
-}
-
-interface RTCSrtpSdesTransport extends EventTarget {
-    onerror: ((this: RTCSrtpSdesTransport, ev: Event) => any) | null;
-    readonly transport: RTCIceTransport;
-    addEventListener<K extends keyof RTCSrtpSdesTransportEventMap>(type: K, listener: (this: RTCSrtpSdesTransport, ev: RTCSrtpSdesTransportEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCSrtpSdesTransportEventMap>(type: K, listener: (this: RTCSrtpSdesTransport, ev: RTCSrtpSdesTransportEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var RTCSrtpSdesTransport: {
-    prototype: RTCSrtpSdesTransport;
-    new(transport: RTCIceTransport, encryptParameters: RTCSrtpSdesParameters, decryptParameters: RTCSrtpSdesParameters): RTCSrtpSdesTransport;
-    getLocalParameters(): RTCSrtpSdesParameters[];
-};
-
-interface RTCSsrcConflictEvent extends Event {
-    readonly ssrc: number;
-}
-
-declare var RTCSsrcConflictEvent: {
-    prototype: RTCSsrcConflictEvent;
-    new(): RTCSsrcConflictEvent;
-};
-
-interface RTCStatsProvider extends EventTarget {
-    getStats(): Promise<RTCStatsReport>;
-    msGetStats(): Promise<RTCStatsReport>;
-}
-
-declare var RTCStatsProvider: {
-    prototype: RTCStatsProvider;
-    new(): RTCStatsProvider;
-};
-
-interface RandomSource {
-    getRandomValues<T extends Int8Array | Uint8ClampedArray | Uint8Array | Int16Array | Uint16Array | Int32Array | Uint32Array>(array: T): T;
-}
-
-declare var RandomSource: {
-    prototype: RandomSource;
-    new(): RandomSource;
-};
-
-interface Range {
-    readonly collapsed: boolean;
-    readonly commonAncestorContainer: Node;
-    readonly endContainer: Node;
-    readonly endOffset: number;
-    readonly startContainer: Node;
-    readonly startOffset: number;
-    cloneContents(): DocumentFragment;
-    cloneRange(): Range;
-    collapse(toStart?: boolean): void;
-    compareBoundaryPoints(how: number, sourceRange: Range): number;
-    createContextualFragment(fragment: string): DocumentFragment;
-    deleteContents(): void;
-    detach(): void;
-    expand(Unit: ExpandGranularity): boolean;
-    extractContents(): DocumentFragment;
-    getBoundingClientRect(): ClientRect | DOMRect;
-    getClientRects(): ClientRectList | DOMRectList;
-    insertNode(node: Node): void;
-    isPointInRange(node: Node, offset: number): boolean;
-    selectNode(node: Node): void;
-    selectNodeContents(node: Node): void;
-    setEnd(node: Node, offset: number): void;
-    setEndAfter(node: Node): void;
-    setEndBefore(node: Node): void;
-    setStart(node: Node, offset: number): void;
-    setStartAfter(node: Node): void;
-    setStartBefore(node: Node): void;
-    surroundContents(newParent: Node): void;
-    toString(): string;
-    readonly END_TO_END: number;
-    readonly END_TO_START: number;
-    readonly START_TO_END: number;
-    readonly START_TO_START: number;
-}
-
-declare var Range: {
-    prototype: Range;
-    new(): Range;
-    readonly END_TO_END: number;
-    readonly END_TO_START: number;
-    readonly START_TO_END: number;
-    readonly START_TO_START: number;
-};
-
-interface ReadableStream {
-    readonly locked: boolean;
-    cancel(): Promise<void>;
-    getReader(): ReadableStreamReader;
-}
-
-declare var ReadableStream: {
-    prototype: ReadableStream;
-    new(): ReadableStream;
-};
-
-interface ReadableStreamReader {
-    cancel(): Promise<void>;
-    read(): Promise<any>;
-    releaseLock(): void;
-}
-
-declare var ReadableStreamReader: {
-    prototype: ReadableStreamReader;
-    new(): ReadableStreamReader;
-};
-
-interface Request extends Body {
-    readonly cache: RequestCache;
-    readonly credentials: RequestCredentials;
-    readonly destination: RequestDestination;
-    readonly headers: Headers;
-    readonly integrity: string;
-    readonly keepalive: boolean;
-    readonly method: string;
-    readonly mode: RequestMode;
-    readonly redirect: RequestRedirect;
-    readonly referrer: string;
-    readonly referrerPolicy: ReferrerPolicy;
-    readonly signal: AbortSignal | null;
-    readonly type: RequestType;
-    readonly url: string;
-    clone(): Request;
-}
-
-declare var Request: {
-    prototype: Request;
-    new(input: Request | string, init?: RequestInit): Request;
-};
-
-interface Response extends Body {
-    readonly body: ReadableStream | null;
-    readonly headers: Headers;
-    readonly ok: boolean;
-    readonly redirected: boolean;
-    readonly status: number;
-    readonly statusText: string;
-    readonly type: ResponseType;
-    readonly url: string;
-    clone(): Response;
-}
-
-declare var Response: {
-    prototype: Response;
-    new(body?: Blob | Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | FormData | string | null, init?: ResponseInit): Response;
-    error(): Response;
-    redirect(url: string, status?: number): Response;
-};
-
-interface SVGAElement extends SVGGraphicsElement, SVGURIReference {
-    readonly target: SVGAnimatedString;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGAElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGAElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGAElement: {
-    prototype: SVGAElement;
-    new(): SVGAElement;
-};
-
-interface SVGAngle {
-    readonly unitType: number;
-    value: number;
-    valueAsString: string;
-    valueInSpecifiedUnits: number;
-    convertToSpecifiedUnits(unitType: number): void;
-    newValueSpecifiedUnits(unitType: number, valueInSpecifiedUnits: number): void;
-    readonly SVG_ANGLETYPE_DEG: number;
-    readonly SVG_ANGLETYPE_GRAD: number;
-    readonly SVG_ANGLETYPE_RAD: number;
-    readonly SVG_ANGLETYPE_UNKNOWN: number;
-    readonly SVG_ANGLETYPE_UNSPECIFIED: number;
-}
-
-declare var SVGAngle: {
-    prototype: SVGAngle;
-    new(): SVGAngle;
-    readonly SVG_ANGLETYPE_DEG: number;
-    readonly SVG_ANGLETYPE_GRAD: number;
-    readonly SVG_ANGLETYPE_RAD: number;
-    readonly SVG_ANGLETYPE_UNKNOWN: number;
-    readonly SVG_ANGLETYPE_UNSPECIFIED: number;
-};
-
-interface SVGAnimatedAngle {
-    readonly animVal: SVGAngle;
-    readonly baseVal: SVGAngle;
-}
-
-declare var SVGAnimatedAngle: {
-    prototype: SVGAnimatedAngle;
-    new(): SVGAnimatedAngle;
-};
-
-interface SVGAnimatedBoolean {
-    readonly animVal: boolean;
-    baseVal: boolean;
-}
-
-declare var SVGAnimatedBoolean: {
-    prototype: SVGAnimatedBoolean;
-    new(): SVGAnimatedBoolean;
-};
-
-interface SVGAnimatedEnumeration {
-    readonly animVal: number;
-    baseVal: number;
-}
-
-declare var SVGAnimatedEnumeration: {
-    prototype: SVGAnimatedEnumeration;
-    new(): SVGAnimatedEnumeration;
-};
-
-interface SVGAnimatedInteger {
-    readonly animVal: number;
-    baseVal: number;
-}
-
-declare var SVGAnimatedInteger: {
-    prototype: SVGAnimatedInteger;
-    new(): SVGAnimatedInteger;
-};
-
-interface SVGAnimatedLength {
-    readonly animVal: SVGLength;
-    readonly baseVal: SVGLength;
-}
-
-declare var SVGAnimatedLength: {
-    prototype: SVGAnimatedLength;
-    new(): SVGAnimatedLength;
-};
-
-interface SVGAnimatedLengthList {
-    readonly animVal: SVGLengthList;
-    readonly baseVal: SVGLengthList;
-}
-
-declare var SVGAnimatedLengthList: {
-    prototype: SVGAnimatedLengthList;
-    new(): SVGAnimatedLengthList;
-};
-
-interface SVGAnimatedNumber {
-    readonly animVal: number;
-    baseVal: number;
-}
-
-declare var SVGAnimatedNumber: {
-    prototype: SVGAnimatedNumber;
-    new(): SVGAnimatedNumber;
-};
-
-interface SVGAnimatedNumberList {
-    readonly animVal: SVGNumberList;
-    readonly baseVal: SVGNumberList;
-}
-
-declare var SVGAnimatedNumberList: {
-    prototype: SVGAnimatedNumberList;
-    new(): SVGAnimatedNumberList;
-};
-
-interface SVGAnimatedPoints {
-    readonly animatedPoints: SVGPointList;
-    readonly points: SVGPointList;
-}
-
-interface SVGAnimatedPreserveAspectRatio {
-    readonly animVal: SVGPreserveAspectRatio;
-    readonly baseVal: SVGPreserveAspectRatio;
-}
-
-declare var SVGAnimatedPreserveAspectRatio: {
-    prototype: SVGAnimatedPreserveAspectRatio;
-    new(): SVGAnimatedPreserveAspectRatio;
-};
-
-interface SVGAnimatedRect {
-    readonly animVal: SVGRect;
-    readonly baseVal: SVGRect;
-}
-
-declare var SVGAnimatedRect: {
-    prototype: SVGAnimatedRect;
-    new(): SVGAnimatedRect;
-};
-
-interface SVGAnimatedString {
-    readonly animVal: string;
-    baseVal: string;
-}
-
-declare var SVGAnimatedString: {
-    prototype: SVGAnimatedString;
-    new(): SVGAnimatedString;
-};
-
-interface SVGAnimatedTransformList {
-    readonly animVal: SVGTransformList;
-    readonly baseVal: SVGTransformList;
-}
-
-declare var SVGAnimatedTransformList: {
-    prototype: SVGAnimatedTransformList;
-    new(): SVGAnimatedTransformList;
-};
-
-interface SVGCircleElement extends SVGGraphicsElement {
-    readonly cx: SVGAnimatedLength;
-    readonly cy: SVGAnimatedLength;
-    readonly r: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGCircleElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGCircleElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGCircleElement: {
-    prototype: SVGCircleElement;
-    new(): SVGCircleElement;
-};
-
-interface SVGClipPathElement extends SVGGraphicsElement, SVGUnitTypes {
-    readonly clipPathUnits: SVGAnimatedEnumeration;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGClipPathElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGClipPathElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGClipPathElement: {
-    prototype: SVGClipPathElement;
-    new(): SVGClipPathElement;
-};
-
-interface SVGComponentTransferFunctionElement extends SVGElement {
-    readonly amplitude: SVGAnimatedNumber;
-    readonly exponent: SVGAnimatedNumber;
-    readonly intercept: SVGAnimatedNumber;
-    readonly offset: SVGAnimatedNumber;
-    readonly slope: SVGAnimatedNumber;
-    readonly tableValues: SVGAnimatedNumberList;
-    readonly type: SVGAnimatedEnumeration;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_DISCRETE: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_GAMMA: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_IDENTITY: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_LINEAR: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_TABLE: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGComponentTransferFunctionElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGComponentTransferFunctionElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGComponentTransferFunctionElement: {
-    prototype: SVGComponentTransferFunctionElement;
-    new(): SVGComponentTransferFunctionElement;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_DISCRETE: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_GAMMA: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_IDENTITY: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_LINEAR: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_TABLE: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_UNKNOWN: number;
-};
-
-interface SVGDefsElement extends SVGGraphicsElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGDefsElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGDefsElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGDefsElement: {
-    prototype: SVGDefsElement;
-    new(): SVGDefsElement;
-};
-
-interface SVGDescElement extends SVGElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGDescElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGDescElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGDescElement: {
-    prototype: SVGDescElement;
-    new(): SVGDescElement;
-};
-
-interface SVGElementEventMap extends ElementEventMap {
-    "click": MouseEvent;
-    "dblclick": MouseEvent;
-    "focusin": FocusEvent;
-    "focusout": FocusEvent;
-    "load": Event;
-    "mousedown": MouseEvent;
-    "mousemove": MouseEvent;
-    "mouseout": MouseEvent;
-    "mouseover": MouseEvent;
-    "mouseup": MouseEvent;
-}
-
-interface SVGElement extends Element, ElementCSSInlineStyle {
-    readonly className: any;
-    onclick: ((this: SVGElement, ev: MouseEvent) => any) | null;
-    ondblclick: ((this: SVGElement, ev: MouseEvent) => any) | null;
-    onfocusin: ((this: SVGElement, ev: FocusEvent) => any) | null;
-    onfocusout: ((this: SVGElement, ev: FocusEvent) => any) | null;
-    onload: ((this: SVGElement, ev: Event) => any) | null;
-    onmousedown: ((this: SVGElement, ev: MouseEvent) => any) | null;
-    onmousemove: ((this: SVGElement, ev: MouseEvent) => any) | null;
-    onmouseout: ((this: SVGElement, ev: MouseEvent) => any) | null;
-    onmouseover: ((this: SVGElement, ev: MouseEvent) => any) | null;
-    onmouseup: ((this: SVGElement, ev: MouseEvent) => any) | null;
-    readonly ownerSVGElement: SVGSVGElement | null;
-    readonly viewportElement: SVGElement | null;
-    /** @deprecated */
-    xmlbase: string;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGElement: {
-    prototype: SVGElement;
-    new(): SVGElement;
-};
-
-interface SVGElementInstance extends EventTarget {
-    readonly childNodes: SVGElementInstanceList;
-    readonly correspondingElement: SVGElement;
-    readonly correspondingUseElement: SVGUseElement;
-    readonly firstChild: SVGElementInstance;
-    readonly lastChild: SVGElementInstance;
-    readonly nextSibling: SVGElementInstance;
-    readonly parentNode: SVGElementInstance;
-    readonly previousSibling: SVGElementInstance;
-}
-
-declare var SVGElementInstance: {
-    prototype: SVGElementInstance;
-    new(): SVGElementInstance;
-};
-
-interface SVGElementInstanceList {
-    /** @deprecated */
-    readonly length: number;
-    /** @deprecated */
-    item(index: number): SVGElementInstance;
-}
-
-declare var SVGElementInstanceList: {
-    prototype: SVGElementInstanceList;
-    new(): SVGElementInstanceList;
-};
-
-interface SVGEllipseElement extends SVGGraphicsElement {
-    readonly cx: SVGAnimatedLength;
-    readonly cy: SVGAnimatedLength;
-    readonly rx: SVGAnimatedLength;
-    readonly ry: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGEllipseElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGEllipseElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGEllipseElement: {
-    prototype: SVGEllipseElement;
-    new(): SVGEllipseElement;
-};
-
-interface SVGFEBlendElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    readonly in2: SVGAnimatedString;
-    readonly mode: SVGAnimatedEnumeration;
-    readonly SVG_FEBLEND_MODE_COLOR: number;
-    readonly SVG_FEBLEND_MODE_COLOR_BURN: number;
-    readonly SVG_FEBLEND_MODE_COLOR_DODGE: number;
-    readonly SVG_FEBLEND_MODE_DARKEN: number;
-    readonly SVG_FEBLEND_MODE_DIFFERENCE: number;
-    readonly SVG_FEBLEND_MODE_EXCLUSION: number;
-    readonly SVG_FEBLEND_MODE_HARD_LIGHT: number;
-    readonly SVG_FEBLEND_MODE_HUE: number;
-    readonly SVG_FEBLEND_MODE_LIGHTEN: number;
-    readonly SVG_FEBLEND_MODE_LUMINOSITY: number;
-    readonly SVG_FEBLEND_MODE_MULTIPLY: number;
-    readonly SVG_FEBLEND_MODE_NORMAL: number;
-    readonly SVG_FEBLEND_MODE_OVERLAY: number;
-    readonly SVG_FEBLEND_MODE_SATURATION: number;
-    readonly SVG_FEBLEND_MODE_SCREEN: number;
-    readonly SVG_FEBLEND_MODE_SOFT_LIGHT: number;
-    readonly SVG_FEBLEND_MODE_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEBlendElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEBlendElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEBlendElement: {
-    prototype: SVGFEBlendElement;
-    new(): SVGFEBlendElement;
-    readonly SVG_FEBLEND_MODE_COLOR: number;
-    readonly SVG_FEBLEND_MODE_COLOR_BURN: number;
-    readonly SVG_FEBLEND_MODE_COLOR_DODGE: number;
-    readonly SVG_FEBLEND_MODE_DARKEN: number;
-    readonly SVG_FEBLEND_MODE_DIFFERENCE: number;
-    readonly SVG_FEBLEND_MODE_EXCLUSION: number;
-    readonly SVG_FEBLEND_MODE_HARD_LIGHT: number;
-    readonly SVG_FEBLEND_MODE_HUE: number;
-    readonly SVG_FEBLEND_MODE_LIGHTEN: number;
-    readonly SVG_FEBLEND_MODE_LUMINOSITY: number;
-    readonly SVG_FEBLEND_MODE_MULTIPLY: number;
-    readonly SVG_FEBLEND_MODE_NORMAL: number;
-    readonly SVG_FEBLEND_MODE_OVERLAY: number;
-    readonly SVG_FEBLEND_MODE_SATURATION: number;
-    readonly SVG_FEBLEND_MODE_SCREEN: number;
-    readonly SVG_FEBLEND_MODE_SOFT_LIGHT: number;
-    readonly SVG_FEBLEND_MODE_UNKNOWN: number;
-};
-
-interface SVGFEColorMatrixElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    readonly type: SVGAnimatedEnumeration;
-    readonly values: SVGAnimatedNumberList;
-    readonly SVG_FECOLORMATRIX_TYPE_HUEROTATE: number;
-    readonly SVG_FECOLORMATRIX_TYPE_LUMINANCETOALPHA: number;
-    readonly SVG_FECOLORMATRIX_TYPE_MATRIX: number;
-    readonly SVG_FECOLORMATRIX_TYPE_SATURATE: number;
-    readonly SVG_FECOLORMATRIX_TYPE_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEColorMatrixElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEColorMatrixElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEColorMatrixElement: {
-    prototype: SVGFEColorMatrixElement;
-    new(): SVGFEColorMatrixElement;
-    readonly SVG_FECOLORMATRIX_TYPE_HUEROTATE: number;
-    readonly SVG_FECOLORMATRIX_TYPE_LUMINANCETOALPHA: number;
-    readonly SVG_FECOLORMATRIX_TYPE_MATRIX: number;
-    readonly SVG_FECOLORMATRIX_TYPE_SATURATE: number;
-    readonly SVG_FECOLORMATRIX_TYPE_UNKNOWN: number;
-};
-
-interface SVGFEComponentTransferElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEComponentTransferElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEComponentTransferElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEComponentTransferElement: {
-    prototype: SVGFEComponentTransferElement;
-    new(): SVGFEComponentTransferElement;
-};
-
-interface SVGFECompositeElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    readonly in2: SVGAnimatedString;
-    readonly k1: SVGAnimatedNumber;
-    readonly k2: SVGAnimatedNumber;
-    readonly k3: SVGAnimatedNumber;
-    readonly k4: SVGAnimatedNumber;
-    readonly operator: SVGAnimatedEnumeration;
-    readonly SVG_FECOMPOSITE_OPERATOR_ARITHMETIC: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_ATOP: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_IN: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_OUT: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_OVER: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_UNKNOWN: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_XOR: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFECompositeElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFECompositeElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFECompositeElement: {
-    prototype: SVGFECompositeElement;
-    new(): SVGFECompositeElement;
-    readonly SVG_FECOMPOSITE_OPERATOR_ARITHMETIC: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_ATOP: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_IN: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_OUT: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_OVER: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_UNKNOWN: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_XOR: number;
-};
-
-interface SVGFEConvolveMatrixElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly bias: SVGAnimatedNumber;
-    readonly divisor: SVGAnimatedNumber;
-    readonly edgeMode: SVGAnimatedEnumeration;
-    readonly in1: SVGAnimatedString;
-    readonly kernelMatrix: SVGAnimatedNumberList;
-    readonly kernelUnitLengthX: SVGAnimatedNumber;
-    readonly kernelUnitLengthY: SVGAnimatedNumber;
-    readonly orderX: SVGAnimatedInteger;
-    readonly orderY: SVGAnimatedInteger;
-    readonly preserveAlpha: SVGAnimatedBoolean;
-    readonly targetX: SVGAnimatedInteger;
-    readonly targetY: SVGAnimatedInteger;
-    readonly SVG_EDGEMODE_DUPLICATE: number;
-    readonly SVG_EDGEMODE_NONE: number;
-    readonly SVG_EDGEMODE_UNKNOWN: number;
-    readonly SVG_EDGEMODE_WRAP: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEConvolveMatrixElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEConvolveMatrixElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEConvolveMatrixElement: {
-    prototype: SVGFEConvolveMatrixElement;
-    new(): SVGFEConvolveMatrixElement;
-    readonly SVG_EDGEMODE_DUPLICATE: number;
-    readonly SVG_EDGEMODE_NONE: number;
-    readonly SVG_EDGEMODE_UNKNOWN: number;
-    readonly SVG_EDGEMODE_WRAP: number;
-};
-
-interface SVGFEDiffuseLightingElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly diffuseConstant: SVGAnimatedNumber;
-    readonly in1: SVGAnimatedString;
-    readonly kernelUnitLengthX: SVGAnimatedNumber;
-    readonly kernelUnitLengthY: SVGAnimatedNumber;
-    readonly surfaceScale: SVGAnimatedNumber;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEDiffuseLightingElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEDiffuseLightingElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEDiffuseLightingElement: {
-    prototype: SVGFEDiffuseLightingElement;
-    new(): SVGFEDiffuseLightingElement;
-};
-
-interface SVGFEDisplacementMapElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    readonly in2: SVGAnimatedString;
-    readonly scale: SVGAnimatedNumber;
-    readonly xChannelSelector: SVGAnimatedEnumeration;
-    readonly yChannelSelector: SVGAnimatedEnumeration;
-    readonly SVG_CHANNEL_A: number;
-    readonly SVG_CHANNEL_B: number;
-    readonly SVG_CHANNEL_G: number;
-    readonly SVG_CHANNEL_R: number;
-    readonly SVG_CHANNEL_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEDisplacementMapElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEDisplacementMapElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEDisplacementMapElement: {
-    prototype: SVGFEDisplacementMapElement;
-    new(): SVGFEDisplacementMapElement;
-    readonly SVG_CHANNEL_A: number;
-    readonly SVG_CHANNEL_B: number;
-    readonly SVG_CHANNEL_G: number;
-    readonly SVG_CHANNEL_R: number;
-    readonly SVG_CHANNEL_UNKNOWN: number;
-};
-
-interface SVGFEDistantLightElement extends SVGElement {
-    readonly azimuth: SVGAnimatedNumber;
-    readonly elevation: SVGAnimatedNumber;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEDistantLightElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEDistantLightElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEDistantLightElement: {
-    prototype: SVGFEDistantLightElement;
-    new(): SVGFEDistantLightElement;
-};
-
-interface SVGFEFloodElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFloodElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFloodElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEFloodElement: {
-    prototype: SVGFEFloodElement;
-    new(): SVGFEFloodElement;
-};
-
-interface SVGFEFuncAElement extends SVGComponentTransferFunctionElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFuncAElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFuncAElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEFuncAElement: {
-    prototype: SVGFEFuncAElement;
-    new(): SVGFEFuncAElement;
-};
-
-interface SVGFEFuncBElement extends SVGComponentTransferFunctionElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFuncBElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFuncBElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEFuncBElement: {
-    prototype: SVGFEFuncBElement;
-    new(): SVGFEFuncBElement;
-};
-
-interface SVGFEFuncGElement extends SVGComponentTransferFunctionElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFuncGElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFuncGElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEFuncGElement: {
-    prototype: SVGFEFuncGElement;
-    new(): SVGFEFuncGElement;
-};
-
-interface SVGFEFuncRElement extends SVGComponentTransferFunctionElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFuncRElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFuncRElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEFuncRElement: {
-    prototype: SVGFEFuncRElement;
-    new(): SVGFEFuncRElement;
-};
-
-interface SVGFEGaussianBlurElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    readonly stdDeviationX: SVGAnimatedNumber;
-    readonly stdDeviationY: SVGAnimatedNumber;
-    setStdDeviation(stdDeviationX: number, stdDeviationY: number): void;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEGaussianBlurElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEGaussianBlurElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEGaussianBlurElement: {
-    prototype: SVGFEGaussianBlurElement;
-    new(): SVGFEGaussianBlurElement;
-};
-
-interface SVGFEImageElement extends SVGElement, SVGFilterPrimitiveStandardAttributes, SVGURIReference {
-    readonly preserveAspectRatio: SVGAnimatedPreserveAspectRatio;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEImageElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEImageElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEImageElement: {
-    prototype: SVGFEImageElement;
-    new(): SVGFEImageElement;
-};
-
-interface SVGFEMergeElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEMergeElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEMergeElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEMergeElement: {
-    prototype: SVGFEMergeElement;
-    new(): SVGFEMergeElement;
-};
-
-interface SVGFEMergeNodeElement extends SVGElement {
-    readonly in1: SVGAnimatedString;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEMergeNodeElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEMergeNodeElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEMergeNodeElement: {
-    prototype: SVGFEMergeNodeElement;
-    new(): SVGFEMergeNodeElement;
-};
-
-interface SVGFEMorphologyElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    readonly operator: SVGAnimatedEnumeration;
-    readonly radiusX: SVGAnimatedNumber;
-    readonly radiusY: SVGAnimatedNumber;
-    readonly SVG_MORPHOLOGY_OPERATOR_DILATE: number;
-    readonly SVG_MORPHOLOGY_OPERATOR_ERODE: number;
-    readonly SVG_MORPHOLOGY_OPERATOR_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEMorphologyElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEMorphologyElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEMorphologyElement: {
-    prototype: SVGFEMorphologyElement;
-    new(): SVGFEMorphologyElement;
-    readonly SVG_MORPHOLOGY_OPERATOR_DILATE: number;
-    readonly SVG_MORPHOLOGY_OPERATOR_ERODE: number;
-    readonly SVG_MORPHOLOGY_OPERATOR_UNKNOWN: number;
-};
-
-interface SVGFEOffsetElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly dx: SVGAnimatedNumber;
-    readonly dy: SVGAnimatedNumber;
-    readonly in1: SVGAnimatedString;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEOffsetElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEOffsetElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEOffsetElement: {
-    prototype: SVGFEOffsetElement;
-    new(): SVGFEOffsetElement;
-};
-
-interface SVGFEPointLightElement extends SVGElement {
-    readonly x: SVGAnimatedNumber;
-    readonly y: SVGAnimatedNumber;
-    readonly z: SVGAnimatedNumber;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEPointLightElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEPointLightElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEPointLightElement: {
-    prototype: SVGFEPointLightElement;
-    new(): SVGFEPointLightElement;
-};
-
-interface SVGFESpecularLightingElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    readonly kernelUnitLengthX: SVGAnimatedNumber;
-    readonly kernelUnitLengthY: SVGAnimatedNumber;
-    readonly specularConstant: SVGAnimatedNumber;
-    readonly specularExponent: SVGAnimatedNumber;
-    readonly surfaceScale: SVGAnimatedNumber;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFESpecularLightingElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFESpecularLightingElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFESpecularLightingElement: {
-    prototype: SVGFESpecularLightingElement;
-    new(): SVGFESpecularLightingElement;
-};
-
-interface SVGFESpotLightElement extends SVGElement {
-    readonly limitingConeAngle: SVGAnimatedNumber;
-    readonly pointsAtX: SVGAnimatedNumber;
-    readonly pointsAtY: SVGAnimatedNumber;
-    readonly pointsAtZ: SVGAnimatedNumber;
-    readonly specularExponent: SVGAnimatedNumber;
-    readonly x: SVGAnimatedNumber;
-    readonly y: SVGAnimatedNumber;
-    readonly z: SVGAnimatedNumber;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFESpotLightElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFESpotLightElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFESpotLightElement: {
-    prototype: SVGFESpotLightElement;
-    new(): SVGFESpotLightElement;
-};
-
-interface SVGFETileElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFETileElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFETileElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFETileElement: {
-    prototype: SVGFETileElement;
-    new(): SVGFETileElement;
-};
-
-interface SVGFETurbulenceElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly baseFrequencyX: SVGAnimatedNumber;
-    readonly baseFrequencyY: SVGAnimatedNumber;
-    readonly numOctaves: SVGAnimatedInteger;
-    readonly seed: SVGAnimatedNumber;
-    readonly stitchTiles: SVGAnimatedEnumeration;
-    readonly type: SVGAnimatedEnumeration;
-    readonly SVG_STITCHTYPE_NOSTITCH: number;
-    readonly SVG_STITCHTYPE_STITCH: number;
-    readonly SVG_STITCHTYPE_UNKNOWN: number;
-    readonly SVG_TURBULENCE_TYPE_FRACTALNOISE: number;
-    readonly SVG_TURBULENCE_TYPE_TURBULENCE: number;
-    readonly SVG_TURBULENCE_TYPE_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFETurbulenceElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFETurbulenceElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFETurbulenceElement: {
-    prototype: SVGFETurbulenceElement;
-    new(): SVGFETurbulenceElement;
-    readonly SVG_STITCHTYPE_NOSTITCH: number;
-    readonly SVG_STITCHTYPE_STITCH: number;
-    readonly SVG_STITCHTYPE_UNKNOWN: number;
-    readonly SVG_TURBULENCE_TYPE_FRACTALNOISE: number;
-    readonly SVG_TURBULENCE_TYPE_TURBULENCE: number;
-    readonly SVG_TURBULENCE_TYPE_UNKNOWN: number;
-};
-
-interface SVGFilterElement extends SVGElement, SVGUnitTypes, SVGURIReference {
-    /** @deprecated */
-    readonly filterResX: SVGAnimatedInteger;
-    /** @deprecated */
-    readonly filterResY: SVGAnimatedInteger;
-    readonly filterUnits: SVGAnimatedEnumeration;
-    readonly height: SVGAnimatedLength;
-    readonly primitiveUnits: SVGAnimatedEnumeration;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-    /** @deprecated */
-    setFilterRes(filterResX: number, filterResY: number): void;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFilterElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFilterElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFilterElement: {
-    prototype: SVGFilterElement;
-    new(): SVGFilterElement;
-};
-
-interface SVGFilterPrimitiveStandardAttributes {
-    readonly height: SVGAnimatedLength;
-    readonly result: SVGAnimatedString;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-}
-
-interface SVGFitToViewBox {
-    readonly preserveAspectRatio: SVGAnimatedPreserveAspectRatio;
-    readonly viewBox: SVGAnimatedRect;
-}
-
-interface SVGForeignObjectElement extends SVGGraphicsElement {
-    readonly height: SVGAnimatedLength;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGForeignObjectElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGForeignObjectElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGForeignObjectElement: {
-    prototype: SVGForeignObjectElement;
-    new(): SVGForeignObjectElement;
-};
-
-interface SVGGElement extends SVGGraphicsElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGGElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGGElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGGElement: {
-    prototype: SVGGElement;
-    new(): SVGGElement;
-};
-
-interface SVGGradientElement extends SVGElement, SVGUnitTypes, SVGURIReference {
-    readonly gradientTransform: SVGAnimatedTransformList;
-    readonly gradientUnits: SVGAnimatedEnumeration;
-    readonly spreadMethod: SVGAnimatedEnumeration;
-    readonly SVG_SPREADMETHOD_PAD: number;
-    readonly SVG_SPREADMETHOD_REFLECT: number;
-    readonly SVG_SPREADMETHOD_REPEAT: number;
-    readonly SVG_SPREADMETHOD_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGGradientElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGGradientElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGGradientElement: {
-    prototype: SVGGradientElement;
-    new(): SVGGradientElement;
-    readonly SVG_SPREADMETHOD_PAD: number;
-    readonly SVG_SPREADMETHOD_REFLECT: number;
-    readonly SVG_SPREADMETHOD_REPEAT: number;
-    readonly SVG_SPREADMETHOD_UNKNOWN: number;
-};
-
-interface SVGGraphicsElement extends SVGElement, SVGTests {
-    /** @deprecated */
-    readonly farthestViewportElement: SVGElement | null;
-    /** @deprecated */
-    readonly nearestViewportElement: SVGElement | null;
-    readonly transform: SVGAnimatedTransformList;
-    getBBox(): SVGRect;
-    getCTM(): SVGMatrix | null;
-    getScreenCTM(): SVGMatrix | null;
-    /** @deprecated */
-    getTransformToElement(element: SVGElement): SVGMatrix;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGGraphicsElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGGraphicsElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGGraphicsElement: {
-    prototype: SVGGraphicsElement;
-    new(): SVGGraphicsElement;
-};
-
-interface SVGImageElement extends SVGGraphicsElement, SVGURIReference {
-    readonly height: SVGAnimatedLength;
-    readonly preserveAspectRatio: SVGAnimatedPreserveAspectRatio;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGImageElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGImageElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGImageElement: {
-    prototype: SVGImageElement;
-    new(): SVGImageElement;
-};
-
-interface SVGLength {
-    readonly unitType: number;
-    value: number;
-    valueAsString: string;
-    valueInSpecifiedUnits: number;
-    convertToSpecifiedUnits(unitType: number): void;
-    newValueSpecifiedUnits(unitType: number, valueInSpecifiedUnits: number): void;
-    readonly SVG_LENGTHTYPE_CM: number;
-    readonly SVG_LENGTHTYPE_EMS: number;
-    readonly SVG_LENGTHTYPE_EXS: number;
-    readonly SVG_LENGTHTYPE_IN: number;
-    readonly SVG_LENGTHTYPE_MM: number;
-    readonly SVG_LENGTHTYPE_NUMBER: number;
-    readonly SVG_LENGTHTYPE_PC: number;
-    readonly SVG_LENGTHTYPE_PERCENTAGE: number;
-    readonly SVG_LENGTHTYPE_PT: number;
-    readonly SVG_LENGTHTYPE_PX: number;
-    readonly SVG_LENGTHTYPE_UNKNOWN: number;
-}
-
-declare var SVGLength: {
-    prototype: SVGLength;
-    new(): SVGLength;
-    readonly SVG_LENGTHTYPE_CM: number;
-    readonly SVG_LENGTHTYPE_EMS: number;
-    readonly SVG_LENGTHTYPE_EXS: number;
-    readonly SVG_LENGTHTYPE_IN: number;
-    readonly SVG_LENGTHTYPE_MM: number;
-    readonly SVG_LENGTHTYPE_NUMBER: number;
-    readonly SVG_LENGTHTYPE_PC: number;
-    readonly SVG_LENGTHTYPE_PERCENTAGE: number;
-    readonly SVG_LENGTHTYPE_PT: number;
-    readonly SVG_LENGTHTYPE_PX: number;
-    readonly SVG_LENGTHTYPE_UNKNOWN: number;
-};
-
-interface SVGLengthList {
-    readonly numberOfItems: number;
-    appendItem(newItem: SVGLength): SVGLength;
-    clear(): void;
-    getItem(index: number): SVGLength;
-    initialize(newItem: SVGLength): SVGLength;
-    insertItemBefore(newItem: SVGLength, index: number): SVGLength;
-    removeItem(index: number): SVGLength;
-    replaceItem(newItem: SVGLength, index: number): SVGLength;
-}
-
-declare var SVGLengthList: {
-    prototype: SVGLengthList;
-    new(): SVGLengthList;
-};
-
-interface SVGLineElement extends SVGGraphicsElement {
-    readonly x1: SVGAnimatedLength;
-    readonly x2: SVGAnimatedLength;
-    readonly y1: SVGAnimatedLength;
-    readonly y2: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGLineElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGLineElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGLineElement: {
-    prototype: SVGLineElement;
-    new(): SVGLineElement;
-};
-
-interface SVGLinearGradientElement extends SVGGradientElement {
-    readonly x1: SVGAnimatedLength;
-    readonly x2: SVGAnimatedLength;
-    readonly y1: SVGAnimatedLength;
-    readonly y2: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGLinearGradientElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGLinearGradientElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGLinearGradientElement: {
-    prototype: SVGLinearGradientElement;
-    new(): SVGLinearGradientElement;
-};
-
-interface SVGMarkerElement extends SVGElement, SVGFitToViewBox {
-    readonly markerHeight: SVGAnimatedLength;
-    readonly markerUnits: SVGAnimatedEnumeration;
-    readonly markerWidth: SVGAnimatedLength;
-    readonly orientAngle: SVGAnimatedAngle;
-    readonly orientType: SVGAnimatedEnumeration;
-    readonly refX: SVGAnimatedLength;
-    readonly refY: SVGAnimatedLength;
-    setOrientToAngle(angle: SVGAngle): void;
-    setOrientToAuto(): void;
-    readonly SVG_MARKERUNITS_STROKEWIDTH: number;
-    readonly SVG_MARKERUNITS_UNKNOWN: number;
-    readonly SVG_MARKERUNITS_USERSPACEONUSE: number;
-    readonly SVG_MARKER_ORIENT_ANGLE: number;
-    readonly SVG_MARKER_ORIENT_AUTO: number;
-    readonly SVG_MARKER_ORIENT_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGMarkerElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGMarkerElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGMarkerElement: {
-    prototype: SVGMarkerElement;
-    new(): SVGMarkerElement;
-    readonly SVG_MARKERUNITS_STROKEWIDTH: number;
-    readonly SVG_MARKERUNITS_UNKNOWN: number;
-    readonly SVG_MARKERUNITS_USERSPACEONUSE: number;
-    readonly SVG_MARKER_ORIENT_ANGLE: number;
-    readonly SVG_MARKER_ORIENT_AUTO: number;
-    readonly SVG_MARKER_ORIENT_UNKNOWN: number;
-};
-
-interface SVGMaskElement extends SVGElement, SVGTests, SVGUnitTypes {
-    readonly height: SVGAnimatedLength;
-    readonly maskContentUnits: SVGAnimatedEnumeration;
-    readonly maskUnits: SVGAnimatedEnumeration;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGMaskElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGMaskElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGMaskElement: {
-    prototype: SVGMaskElement;
-    new(): SVGMaskElement;
-};
-
-interface SVGMatrix {
-    a: number;
-    b: number;
-    c: number;
-    d: number;
-    e: number;
-    f: number;
-    flipX(): SVGMatrix;
-    flipY(): SVGMatrix;
-    inverse(): SVGMatrix;
-    multiply(secondMatrix: SVGMatrix): SVGMatrix;
-    rotate(angle: number): SVGMatrix;
-    rotateFromVector(x: number, y: number): SVGMatrix;
-    scale(scaleFactor: number): SVGMatrix;
-    scaleNonUniform(scaleFactorX: number, scaleFactorY: number): SVGMatrix;
-    skewX(angle: number): SVGMatrix;
-    skewY(angle: number): SVGMatrix;
-    translate(x: number, y: number): SVGMatrix;
-}
-
-declare var SVGMatrix: {
-    prototype: SVGMatrix;
-    new(): SVGMatrix;
-};
-
-interface SVGMetadataElement extends SVGElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGMetadataElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGMetadataElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGMetadataElement: {
-    prototype: SVGMetadataElement;
-    new(): SVGMetadataElement;
-};
-
-interface SVGNumber {
-    value: number;
-}
-
-declare var SVGNumber: {
-    prototype: SVGNumber;
-    new(): SVGNumber;
-};
-
-interface SVGNumberList {
-    readonly numberOfItems: number;
-    appendItem(newItem: SVGNumber): SVGNumber;
-    clear(): void;
-    getItem(index: number): SVGNumber;
-    initialize(newItem: SVGNumber): SVGNumber;
-    insertItemBefore(newItem: SVGNumber, index: number): SVGNumber;
-    removeItem(index: number): SVGNumber;
-    replaceItem(newItem: SVGNumber, index: number): SVGNumber;
-}
-
-declare var SVGNumberList: {
-    prototype: SVGNumberList;
-    new(): SVGNumberList;
-};
-
-interface SVGPathElement extends SVGGraphicsElement {
-    /** @deprecated */
-    readonly pathSegList: SVGPathSegList;
-    /** @deprecated */
-    createSVGPathSegArcAbs(x: number, y: number, r1: number, r2: number, angle: number, largeArcFlag: boolean, sweepFlag: boolean): SVGPathSegArcAbs;
-    /** @deprecated */
-    createSVGPathSegArcRel(x: number, y: number, r1: number, r2: number, angle: number, largeArcFlag: boolean, sweepFlag: boolean): SVGPathSegArcRel;
-    /** @deprecated */
-    createSVGPathSegClosePath(): SVGPathSegClosePath;
-    /** @deprecated */
-    createSVGPathSegCurvetoCubicAbs(x: number, y: number, x1: number, y1: number, x2: number, y2: number): SVGPathSegCurvetoCubicAbs;
-    /** @deprecated */
-    createSVGPathSegCurvetoCubicRel(x: number, y: number, x1: number, y1: number, x2: number, y2: number): SVGPathSegCurvetoCubicRel;
-    /** @deprecated */
-    createSVGPathSegCurvetoCubicSmoothAbs(x: number, y: number, x2: number, y2: number): SVGPathSegCurvetoCubicSmoothAbs;
-    /** @deprecated */
-    createSVGPathSegCurvetoCubicSmoothRel(x: number, y: number, x2: number, y2: number): SVGPathSegCurvetoCubicSmoothRel;
-    /** @deprecated */
-    createSVGPathSegCurvetoQuadraticAbs(x: number, y: number, x1: number, y1: number): SVGPathSegCurvetoQuadraticAbs;
-    /** @deprecated */
-    createSVGPathSegCurvetoQuadraticRel(x: number, y: number, x1: number, y1: number): SVGPathSegCurvetoQuadraticRel;
-    /** @deprecated */
-    createSVGPathSegCurvetoQuadraticSmoothAbs(x: number, y: number): SVGPathSegCurvetoQuadraticSmoothAbs;
-    /** @deprecated */
-    createSVGPathSegCurvetoQuadraticSmoothRel(x: number, y: number): SVGPathSegCurvetoQuadraticSmoothRel;
-    /** @deprecated */
-    createSVGPathSegLinetoAbs(x: number, y: number): SVGPathSegLinetoAbs;
-    /** @deprecated */
-    createSVGPathSegLinetoHorizontalAbs(x: number): SVGPathSegLinetoHorizontalAbs;
-    /** @deprecated */
-    createSVGPathSegLinetoHorizontalRel(x: number): SVGPathSegLinetoHorizontalRel;
-    /** @deprecated */
-    createSVGPathSegLinetoRel(x: number, y: number): SVGPathSegLinetoRel;
-    /** @deprecated */
-    createSVGPathSegLinetoVerticalAbs(y: number): SVGPathSegLinetoVerticalAbs;
-    /** @deprecated */
-    createSVGPathSegLinetoVerticalRel(y: number): SVGPathSegLinetoVerticalRel;
-    /** @deprecated */
-    createSVGPathSegMovetoAbs(x: number, y: number): SVGPathSegMovetoAbs;
-    /** @deprecated */
-    createSVGPathSegMovetoRel(x: number, y: number): SVGPathSegMovetoRel;
-    /** @deprecated */
-    getPathSegAtLength(distance: number): number;
-    getPointAtLength(distance: number): SVGPoint;
-    getTotalLength(): number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGPathElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGPathElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGPathElement: {
-    prototype: SVGPathElement;
-    new(): SVGPathElement;
-};
-
-interface SVGPathSeg {
-    readonly pathSegType: number;
-    readonly pathSegTypeAsLetter: string;
-    readonly PATHSEG_ARC_ABS: number;
-    readonly PATHSEG_ARC_REL: number;
-    readonly PATHSEG_CLOSEPATH: number;
-    readonly PATHSEG_CURVETO_CUBIC_ABS: number;
-    readonly PATHSEG_CURVETO_CUBIC_REL: number;
-    readonly PATHSEG_CURVETO_CUBIC_SMOOTH_ABS: number;
-    readonly PATHSEG_CURVETO_CUBIC_SMOOTH_REL: number;
-    readonly PATHSEG_CURVETO_QUADRATIC_ABS: number;
-    readonly PATHSEG_CURVETO_QUADRATIC_REL: number;
-    readonly PATHSEG_CURVETO_QUADRATIC_SMOOTH_ABS: number;
-    readonly PATHSEG_CURVETO_QUADRATIC_SMOOTH_REL: number;
-    readonly PATHSEG_LINETO_ABS: number;
-    readonly PATHSEG_LINETO_HORIZONTAL_ABS: number;
-    readonly PATHSEG_LINETO_HORIZONTAL_REL: number;
-    readonly PATHSEG_LINETO_REL: number;
-    readonly PATHSEG_LINETO_VERTICAL_ABS: number;
-    readonly PATHSEG_LINETO_VERTICAL_REL: number;
-    readonly PATHSEG_MOVETO_ABS: number;
-    readonly PATHSEG_MOVETO_REL: number;
-    readonly PATHSEG_UNKNOWN: number;
-}
-
-declare var SVGPathSeg: {
-    prototype: SVGPathSeg;
-    new(): SVGPathSeg;
-    readonly PATHSEG_ARC_ABS: number;
-    readonly PATHSEG_ARC_REL: number;
-    readonly PATHSEG_CLOSEPATH: number;
-    readonly PATHSEG_CURVETO_CUBIC_ABS: number;
-    readonly PATHSEG_CURVETO_CUBIC_REL: number;
-    readonly PATHSEG_CURVETO_CUBIC_SMOOTH_ABS: number;
-    readonly PATHSEG_CURVETO_CUBIC_SMOOTH_REL: number;
-    readonly PATHSEG_CURVETO_QUADRATIC_ABS: number;
-    readonly PATHSEG_CURVETO_QUADRATIC_REL: number;
-    readonly PATHSEG_CURVETO_QUADRATIC_SMOOTH_ABS: number;
-    readonly PATHSEG_CURVETO_QUADRATIC_SMOOTH_REL: number;
-    readonly PATHSEG_LINETO_ABS: number;
-    readonly PATHSEG_LINETO_HORIZONTAL_ABS: number;
-    readonly PATHSEG_LINETO_HORIZONTAL_REL: number;
-    readonly PATHSEG_LINETO_REL: number;
-    readonly PATHSEG_LINETO_VERTICAL_ABS: number;
-    readonly PATHSEG_LINETO_VERTICAL_REL: number;
-    readonly PATHSEG_MOVETO_ABS: number;
-    readonly PATHSEG_MOVETO_REL: number;
-    readonly PATHSEG_UNKNOWN: number;
-};
-
-interface SVGPathSegArcAbs extends SVGPathSeg {
-    angle: number;
-    largeArcFlag: boolean;
-    r1: number;
-    r2: number;
-    sweepFlag: boolean;
-    x: number;
-    y: number;
-}
-
-declare var SVGPathSegArcAbs: {
-    prototype: SVGPathSegArcAbs;
-    new(): SVGPathSegArcAbs;
-};
-
-interface SVGPathSegArcRel extends SVGPathSeg {
-    angle: number;
-    largeArcFlag: boolean;
-    r1: number;
-    r2: number;
-    sweepFlag: boolean;
-    x: number;
-    y: number;
-}
-
-declare var SVGPathSegArcRel: {
-    prototype: SVGPathSegArcRel;
-    new(): SVGPathSegArcRel;
-};
-
-interface SVGPathSegClosePath extends SVGPathSeg {
-}
-
-declare var SVGPathSegClosePath: {
-    prototype: SVGPathSegClosePath;
-    new(): SVGPathSegClosePath;
-};
-
-interface SVGPathSegCurvetoCubicAbs extends SVGPathSeg {
-    x: number;
-    x1: number;
-    x2: number;
-    y: number;
-    y1: number;
-    y2: number;
-}
-
-declare var SVGPathSegCurvetoCubicAbs: {
-    prototype: SVGPathSegCurvetoCubicAbs;
-    new(): SVGPathSegCurvetoCubicAbs;
-};
-
-interface SVGPathSegCurvetoCubicRel extends SVGPathSeg {
-    x: number;
-    x1: number;
-    x2: number;
-    y: number;
-    y1: number;
-    y2: number;
-}
-
-declare var SVGPathSegCurvetoCubicRel: {
-    prototype: SVGPathSegCurvetoCubicRel;
-    new(): SVGPathSegCurvetoCubicRel;
-};
-
-interface SVGPathSegCurvetoCubicSmoothAbs extends SVGPathSeg {
-    x: number;
-    x2: number;
-    y: number;
-    y2: number;
-}
-
-declare var SVGPathSegCurvetoCubicSmoothAbs: {
-    prototype: SVGPathSegCurvetoCubicSmoothAbs;
-    new(): SVGPathSegCurvetoCubicSmoothAbs;
-};
-
-interface SVGPathSegCurvetoCubicSmoothRel extends SVGPathSeg {
-    x: number;
-    x2: number;
-    y: number;
-    y2: number;
-}
-
-declare var SVGPathSegCurvetoCubicSmoothRel: {
-    prototype: SVGPathSegCurvetoCubicSmoothRel;
-    new(): SVGPathSegCurvetoCubicSmoothRel;
-};
-
-interface SVGPathSegCurvetoQuadraticAbs extends SVGPathSeg {
-    x: number;
-    x1: number;
-    y: number;
-    y1: number;
-}
-
-declare var SVGPathSegCurvetoQuadraticAbs: {
-    prototype: SVGPathSegCurvetoQuadraticAbs;
-    new(): SVGPathSegCurvetoQuadraticAbs;
-};
-
-interface SVGPathSegCurvetoQuadraticRel extends SVGPathSeg {
-    x: number;
-    x1: number;
-    y: number;
-    y1: number;
-}
-
-declare var SVGPathSegCurvetoQuadraticRel: {
-    prototype: SVGPathSegCurvetoQuadraticRel;
-    new(): SVGPathSegCurvetoQuadraticRel;
-};
-
-interface SVGPathSegCurvetoQuadraticSmoothAbs extends SVGPathSeg {
-    x: number;
-    y: number;
-}
-
-declare var SVGPathSegCurvetoQuadraticSmoothAbs: {
-    prototype: SVGPathSegCurvetoQuadraticSmoothAbs;
-    new(): SVGPathSegCurvetoQuadraticSmoothAbs;
-};
-
-interface SVGPathSegCurvetoQuadraticSmoothRel extends SVGPathSeg {
-    x: number;
-    y: number;
-}
-
-declare var SVGPathSegCurvetoQuadraticSmoothRel: {
-    prototype: SVGPathSegCurvetoQuadraticSmoothRel;
-    new(): SVGPathSegCurvetoQuadraticSmoothRel;
-};
-
-interface SVGPathSegLinetoAbs extends SVGPathSeg {
-    x: number;
-    y: number;
-}
-
-declare var SVGPathSegLinetoAbs: {
-    prototype: SVGPathSegLinetoAbs;
-    new(): SVGPathSegLinetoAbs;
-};
-
-interface SVGPathSegLinetoHorizontalAbs extends SVGPathSeg {
-    x: number;
-}
-
-declare var SVGPathSegLinetoHorizontalAbs: {
-    prototype: SVGPathSegLinetoHorizontalAbs;
-    new(): SVGPathSegLinetoHorizontalAbs;
-};
-
-interface SVGPathSegLinetoHorizontalRel extends SVGPathSeg {
-    x: number;
-}
-
-declare var SVGPathSegLinetoHorizontalRel: {
-    prototype: SVGPathSegLinetoHorizontalRel;
-    new(): SVGPathSegLinetoHorizontalRel;
-};
-
-interface SVGPathSegLinetoRel extends SVGPathSeg {
-    x: number;
-    y: number;
-}
-
-declare var SVGPathSegLinetoRel: {
-    prototype: SVGPathSegLinetoRel;
-    new(): SVGPathSegLinetoRel;
-};
-
-interface SVGPathSegLinetoVerticalAbs extends SVGPathSeg {
-    y: number;
-}
-
-declare var SVGPathSegLinetoVerticalAbs: {
-    prototype: SVGPathSegLinetoVerticalAbs;
-    new(): SVGPathSegLinetoVerticalAbs;
-};
-
-interface SVGPathSegLinetoVerticalRel extends SVGPathSeg {
-    y: number;
-}
-
-declare var SVGPathSegLinetoVerticalRel: {
-    prototype: SVGPathSegLinetoVerticalRel;
-    new(): SVGPathSegLinetoVerticalRel;
-};
-
-interface SVGPathSegList {
-    readonly numberOfItems: number;
-    appendItem(newItem: SVGPathSeg): SVGPathSeg;
-    clear(): void;
-    getItem(index: number): SVGPathSeg;
-    initialize(newItem: SVGPathSeg): SVGPathSeg;
-    insertItemBefore(newItem: SVGPathSeg, index: number): SVGPathSeg;
-    removeItem(index: number): SVGPathSeg;
-    replaceItem(newItem: SVGPathSeg, index: number): SVGPathSeg;
-}
-
-declare var SVGPathSegList: {
-    prototype: SVGPathSegList;
-    new(): SVGPathSegList;
-};
-
-interface SVGPathSegMovetoAbs extends SVGPathSeg {
-    x: number;
-    y: number;
-}
-
-declare var SVGPathSegMovetoAbs: {
-    prototype: SVGPathSegMovetoAbs;
-    new(): SVGPathSegMovetoAbs;
-};
-
-interface SVGPathSegMovetoRel extends SVGPathSeg {
-    x: number;
-    y: number;
-}
-
-declare var SVGPathSegMovetoRel: {
-    prototype: SVGPathSegMovetoRel;
-    new(): SVGPathSegMovetoRel;
-};
-
-interface SVGPatternElement extends SVGElement, SVGTests, SVGUnitTypes, SVGFitToViewBox, SVGURIReference {
-    readonly height: SVGAnimatedLength;
-    readonly patternContentUnits: SVGAnimatedEnumeration;
-    readonly patternTransform: SVGAnimatedTransformList;
-    readonly patternUnits: SVGAnimatedEnumeration;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGPatternElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGPatternElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGPatternElement: {
-    prototype: SVGPatternElement;
-    new(): SVGPatternElement;
-};
-
-interface SVGPoint {
-    x: number;
-    y: number;
-    matrixTransform(matrix: SVGMatrix): SVGPoint;
-}
-
-declare var SVGPoint: {
-    prototype: SVGPoint;
-    new(): SVGPoint;
-};
-
-interface SVGPointList {
-    readonly numberOfItems: number;
-    appendItem(newItem: SVGPoint): SVGPoint;
-    clear(): void;
-    getItem(index: number): SVGPoint;
-    initialize(newItem: SVGPoint): SVGPoint;
-    insertItemBefore(newItem: SVGPoint, index: number): SVGPoint;
-    removeItem(index: number): SVGPoint;
-    replaceItem(newItem: SVGPoint, index: number): SVGPoint;
-}
-
-declare var SVGPointList: {
-    prototype: SVGPointList;
-    new(): SVGPointList;
-};
-
-interface SVGPolygonElement extends SVGGraphicsElement, SVGAnimatedPoints {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGPolygonElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGPolygonElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGPolygonElement: {
-    prototype: SVGPolygonElement;
-    new(): SVGPolygonElement;
-};
-
-interface SVGPolylineElement extends SVGGraphicsElement, SVGAnimatedPoints {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGPolylineElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGPolylineElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGPolylineElement: {
-    prototype: SVGPolylineElement;
-    new(): SVGPolylineElement;
-};
-
-interface SVGPreserveAspectRatio {
-    align: number;
-    meetOrSlice: number;
-    readonly SVG_MEETORSLICE_MEET: number;
-    readonly SVG_MEETORSLICE_SLICE: number;
-    readonly SVG_MEETORSLICE_UNKNOWN: number;
-    readonly SVG_PRESERVEASPECTRATIO_NONE: number;
-    readonly SVG_PRESERVEASPECTRATIO_UNKNOWN: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMAXYMAX: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMAXYMID: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMAXYMIN: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMIDYMAX: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMIDYMID: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMIDYMIN: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMINYMAX: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMINYMID: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMINYMIN: number;
-}
-
-declare var SVGPreserveAspectRatio: {
-    prototype: SVGPreserveAspectRatio;
-    new(): SVGPreserveAspectRatio;
-    readonly SVG_MEETORSLICE_MEET: number;
-    readonly SVG_MEETORSLICE_SLICE: number;
-    readonly SVG_MEETORSLICE_UNKNOWN: number;
-    readonly SVG_PRESERVEASPECTRATIO_NONE: number;
-    readonly SVG_PRESERVEASPECTRATIO_UNKNOWN: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMAXYMAX: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMAXYMID: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMAXYMIN: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMIDYMAX: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMIDYMID: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMIDYMIN: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMINYMAX: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMINYMID: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMINYMIN: number;
-};
-
-interface SVGRadialGradientElement extends SVGGradientElement {
-    readonly cx: SVGAnimatedLength;
-    readonly cy: SVGAnimatedLength;
-    readonly fx: SVGAnimatedLength;
-    readonly fy: SVGAnimatedLength;
-    readonly r: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGRadialGradientElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGRadialGradientElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGRadialGradientElement: {
-    prototype: SVGRadialGradientElement;
-    new(): SVGRadialGradientElement;
-};
-
-interface SVGRect {
-    height: number;
-    width: number;
-    x: number;
-    y: number;
-}
-
-declare var SVGRect: {
-    prototype: SVGRect;
-    new(): SVGRect;
-};
-
-interface SVGRectElement extends SVGGraphicsElement {
-    readonly height: SVGAnimatedLength;
-    readonly rx: SVGAnimatedLength;
-    readonly ry: SVGAnimatedLength;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGRectElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGRectElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGRectElement: {
-    prototype: SVGRectElement;
-    new(): SVGRectElement;
-};
-
-interface SVGSVGElementEventMap extends SVGElementEventMap {
-    "SVGAbort": Event;
-    "SVGError": Event;
-    "resize": UIEvent;
-    "scroll": UIEvent;
-    "SVGUnload": Event;
-    "SVGZoom": SVGZoomEvent;
-}
-
-interface SVGSVGElement extends SVGGraphicsElement, DocumentEvent, SVGFitToViewBox, SVGZoomAndPan {
-    /** @deprecated */
-    contentScriptType: string;
-    /** @deprecated */
-    contentStyleType: string;
-    currentScale: number;
-    readonly currentTranslate: SVGPoint;
-    readonly height: SVGAnimatedLength;
-    onabort: ((this: SVGSVGElement, ev: Event) => any) | null;
-    onerror: ((this: SVGSVGElement, ev: Event) => any) | null;
-    onresize: ((this: SVGSVGElement, ev: UIEvent) => any) | null;
-    onscroll: ((this: SVGSVGElement, ev: UIEvent) => any) | null;
-    onunload: ((this: SVGSVGElement, ev: Event) => any) | null;
-    onzoom: ((this: SVGSVGElement, ev: SVGZoomEvent) => any) | null;
-    /** @deprecated */
-    readonly pixelUnitToMillimeterX: number;
-    /** @deprecated */
-    readonly pixelUnitToMillimeterY: number;
-    /** @deprecated */
-    readonly screenPixelToMillimeterX: number;
-    /** @deprecated */
-    readonly screenPixelToMillimeterY: number;
-    /** @deprecated */
-    readonly viewport: SVGRect;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-    checkEnclosure(element: SVGElement, rect: SVGRect): boolean;
-    checkIntersection(element: SVGElement, rect: SVGRect): boolean;
-    createSVGAngle(): SVGAngle;
-    createSVGLength(): SVGLength;
-    createSVGMatrix(): SVGMatrix;
-    createSVGNumber(): SVGNumber;
-    createSVGPoint(): SVGPoint;
-    createSVGRect(): SVGRect;
-    createSVGTransform(): SVGTransform;
-    createSVGTransformFromMatrix(matrix: SVGMatrix): SVGTransform;
-    deselectAll(): void;
-    /** @deprecated */
-    forceRedraw(): void;
-    getComputedStyle(elt: Element, pseudoElt?: string | null): CSSStyleDeclaration;
-    /** @deprecated */
-    getCurrentTime(): number;
-    getElementById(elementId: string): Element;
-    getEnclosureList(rect: SVGRect, referenceElement: SVGElement): NodeListOf<SVGCircleElement | SVGEllipseElement | SVGImageElement | SVGLineElement | SVGPathElement | SVGPolygonElement | SVGPolylineElement | SVGRectElement | SVGTextElement | SVGUseElement>;
-    getIntersectionList(rect: SVGRect, referenceElement: SVGElement): NodeListOf<SVGCircleElement | SVGEllipseElement | SVGImageElement | SVGLineElement | SVGPathElement | SVGPolygonElement | SVGPolylineElement | SVGRectElement | SVGTextElement | SVGUseElement>;
-    /** @deprecated */
-    pauseAnimations(): void;
-    /** @deprecated */
-    setCurrentTime(seconds: number): void;
-    /** @deprecated */
-    suspendRedraw(maxWaitMilliseconds: number): number;
-    /** @deprecated */
-    unpauseAnimations(): void;
-    /** @deprecated */
-    unsuspendRedraw(suspendHandleID: number): void;
-    /** @deprecated */
-    unsuspendRedrawAll(): void;
-    addEventListener<K extends keyof SVGSVGElementEventMap>(type: K, listener: (this: SVGSVGElement, ev: SVGSVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGSVGElementEventMap>(type: K, listener: (this: SVGSVGElement, ev: SVGSVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGSVGElement: {
-    prototype: SVGSVGElement;
-    new(): SVGSVGElement;
-};
-
-interface SVGScriptElement extends SVGElement, SVGURIReference {
-    type: string;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGScriptElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGScriptElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGScriptElement: {
-    prototype: SVGScriptElement;
-    new(): SVGScriptElement;
-};
-
-interface SVGStopElement extends SVGElement {
-    readonly offset: SVGAnimatedNumber;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGStopElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGStopElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGStopElement: {
-    prototype: SVGStopElement;
-    new(): SVGStopElement;
-};
-
-interface SVGStringList {
-    readonly numberOfItems: number;
-    appendItem(newItem: string): string;
-    clear(): void;
-    getItem(index: number): string;
-    initialize(newItem: string): string;
-    insertItemBefore(newItem: string, index: number): string;
-    removeItem(index: number): string;
-    replaceItem(newItem: string, index: number): string;
-}
-
-declare var SVGStringList: {
-    prototype: SVGStringList;
-    new(): SVGStringList;
-};
-
-interface SVGStylable {
-    className: any;
-}
-
-declare var SVGStylable: {
-    prototype: SVGStylable;
-    new(): SVGStylable;
-};
-
-interface SVGStyleElement extends SVGElement {
-    disabled: boolean;
-    media: string;
-    title: string;
-    type: string;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGStyleElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGStyleElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGStyleElement: {
-    prototype: SVGStyleElement;
-    new(): SVGStyleElement;
-};
-
-interface SVGSwitchElement extends SVGGraphicsElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGSwitchElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGSwitchElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGSwitchElement: {
-    prototype: SVGSwitchElement;
-    new(): SVGSwitchElement;
-};
-
-interface SVGSymbolElement extends SVGElement, SVGFitToViewBox {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGSymbolElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGSymbolElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGSymbolElement: {
-    prototype: SVGSymbolElement;
-    new(): SVGSymbolElement;
-};
-
-interface SVGTSpanElement extends SVGTextPositioningElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTSpanElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTSpanElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGTSpanElement: {
-    prototype: SVGTSpanElement;
-    new(): SVGTSpanElement;
-};
-
-interface SVGTests {
-    readonly requiredExtensions: SVGStringList;
-    /** @deprecated */
-    readonly requiredFeatures: SVGStringList;
-    readonly systemLanguage: SVGStringList;
-    /** @deprecated */
-    hasExtension(extension: string): boolean;
-}
-
-interface SVGTextContentElement extends SVGGraphicsElement {
-    readonly lengthAdjust: SVGAnimatedEnumeration;
-    readonly textLength: SVGAnimatedLength;
-    getCharNumAtPosition(point: SVGPoint): number;
-    getComputedTextLength(): number;
-    getEndPositionOfChar(charnum: number): SVGPoint;
-    getExtentOfChar(charnum: number): SVGRect;
-    getNumberOfChars(): number;
-    getRotationOfChar(charnum: number): number;
-    getStartPositionOfChar(charnum: number): SVGPoint;
-    getSubStringLength(charnum: number, nchars: number): number;
-    selectSubString(charnum: number, nchars: number): void;
-    readonly LENGTHADJUST_SPACING: number;
-    readonly LENGTHADJUST_SPACINGANDGLYPHS: number;
-    readonly LENGTHADJUST_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTextContentElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTextContentElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGTextContentElement: {
-    prototype: SVGTextContentElement;
-    new(): SVGTextContentElement;
-    readonly LENGTHADJUST_SPACING: number;
-    readonly LENGTHADJUST_SPACINGANDGLYPHS: number;
-    readonly LENGTHADJUST_UNKNOWN: number;
-};
-
-interface SVGTextElement extends SVGTextPositioningElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTextElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTextElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGTextElement: {
-    prototype: SVGTextElement;
-    new(): SVGTextElement;
-};
-
-interface SVGTextPathElement extends SVGTextContentElement, SVGURIReference {
-    readonly method: SVGAnimatedEnumeration;
-    readonly spacing: SVGAnimatedEnumeration;
-    readonly startOffset: SVGAnimatedLength;
-    readonly TEXTPATH_METHODTYPE_ALIGN: number;
-    readonly TEXTPATH_METHODTYPE_STRETCH: number;
-    readonly TEXTPATH_METHODTYPE_UNKNOWN: number;
-    readonly TEXTPATH_SPACINGTYPE_AUTO: number;
-    readonly TEXTPATH_SPACINGTYPE_EXACT: number;
-    readonly TEXTPATH_SPACINGTYPE_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTextPathElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTextPathElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGTextPathElement: {
-    prototype: SVGTextPathElement;
-    new(): SVGTextPathElement;
-    readonly TEXTPATH_METHODTYPE_ALIGN: number;
-    readonly TEXTPATH_METHODTYPE_STRETCH: number;
-    readonly TEXTPATH_METHODTYPE_UNKNOWN: number;
-    readonly TEXTPATH_SPACINGTYPE_AUTO: number;
-    readonly TEXTPATH_SPACINGTYPE_EXACT: number;
-    readonly TEXTPATH_SPACINGTYPE_UNKNOWN: number;
-};
-
-interface SVGTextPositioningElement extends SVGTextContentElement {
-    readonly dx: SVGAnimatedLengthList;
-    readonly dy: SVGAnimatedLengthList;
-    readonly rotate: SVGAnimatedNumberList;
-    readonly x: SVGAnimatedLengthList;
-    readonly y: SVGAnimatedLengthList;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTextPositioningElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTextPositioningElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGTextPositioningElement: {
-    prototype: SVGTextPositioningElement;
-    new(): SVGTextPositioningElement;
-};
-
-interface SVGTitleElement extends SVGElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTitleElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTitleElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGTitleElement: {
-    prototype: SVGTitleElement;
-    new(): SVGTitleElement;
-};
-
-interface SVGTransform {
-    readonly angle: number;
-    readonly matrix: SVGMatrix;
-    readonly type: number;
-    setMatrix(matrix: SVGMatrix): void;
-    setRotate(angle: number, cx: number, cy: number): void;
-    setScale(sx: number, sy: number): void;
-    setSkewX(angle: number): void;
-    setSkewY(angle: number): void;
-    setTranslate(tx: number, ty: number): void;
-    readonly SVG_TRANSFORM_MATRIX: number;
-    readonly SVG_TRANSFORM_ROTATE: number;
-    readonly SVG_TRANSFORM_SCALE: number;
-    readonly SVG_TRANSFORM_SKEWX: number;
-    readonly SVG_TRANSFORM_SKEWY: number;
-    readonly SVG_TRANSFORM_TRANSLATE: number;
-    readonly SVG_TRANSFORM_UNKNOWN: number;
-}
-
-declare var SVGTransform: {
-    prototype: SVGTransform;
-    new(): SVGTransform;
-    readonly SVG_TRANSFORM_MATRIX: number;
-    readonly SVG_TRANSFORM_ROTATE: number;
-    readonly SVG_TRANSFORM_SCALE: number;
-    readonly SVG_TRANSFORM_SKEWX: number;
-    readonly SVG_TRANSFORM_SKEWY: number;
-    readonly SVG_TRANSFORM_TRANSLATE: number;
-    readonly SVG_TRANSFORM_UNKNOWN: number;
-};
-
-interface SVGTransformList {
-    readonly numberOfItems: number;
-    appendItem(newItem: SVGTransform): SVGTransform;
-    clear(): void;
-    consolidate(): SVGTransform;
-    createSVGTransformFromMatrix(matrix: SVGMatrix): SVGTransform;
-    getItem(index: number): SVGTransform;
-    initialize(newItem: SVGTransform): SVGTransform;
-    insertItemBefore(newItem: SVGTransform, index: number): SVGTransform;
-    removeItem(index: number): SVGTransform;
-    replaceItem(newItem: SVGTransform, index: number): SVGTransform;
-}
-
-declare var SVGTransformList: {
-    prototype: SVGTransformList;
-    new(): SVGTransformList;
-};
-
-interface SVGURIReference {
-    readonly href: SVGAnimatedString;
-}
-
-interface SVGUnitTypes {
-    readonly SVG_UNIT_TYPE_OBJECTBOUNDINGBOX: number;
-    readonly SVG_UNIT_TYPE_UNKNOWN: number;
-    readonly SVG_UNIT_TYPE_USERSPACEONUSE: number;
-}
-declare var SVGUnitTypes: SVGUnitTypes;
-
-interface SVGUseElement extends SVGGraphicsElement, SVGURIReference {
-    readonly animatedInstanceRoot: SVGElementInstance | null;
-    readonly height: SVGAnimatedLength;
-    readonly instanceRoot: SVGElementInstance | null;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGUseElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGUseElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGUseElement: {
-    prototype: SVGUseElement;
-    new(): SVGUseElement;
-};
-
-interface SVGViewElement extends SVGElement, SVGFitToViewBox, SVGZoomAndPan {
-    /** @deprecated */
-    readonly viewTarget: SVGStringList;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGViewElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGViewElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGViewElement: {
-    prototype: SVGViewElement;
-    new(): SVGViewElement;
-};
-
-interface SVGZoomAndPan {
-    readonly zoomAndPan: number;
-}
-
-declare var SVGZoomAndPan: {
-    readonly SVG_ZOOMANDPAN_DISABLE: number;
-    readonly SVG_ZOOMANDPAN_MAGNIFY: number;
-    readonly SVG_ZOOMANDPAN_UNKNOWN: number;
-};
-
-interface SVGZoomEvent extends UIEvent {
-    readonly newScale: number;
-    readonly newTranslate: SVGPoint;
-    readonly previousScale: number;
-    readonly previousTranslate: SVGPoint;
-    readonly zoomRectScreen: SVGRect;
-}
-
-declare var SVGZoomEvent: {
-    prototype: SVGZoomEvent;
-    new(): SVGZoomEvent;
-};
-
-interface ScopedCredential {
-    readonly id: ArrayBuffer;
-    readonly type: ScopedCredentialType;
-}
-
-declare var ScopedCredential: {
-    prototype: ScopedCredential;
-    new(): ScopedCredential;
-};
-
-interface ScopedCredentialInfo {
-    readonly credential: ScopedCredential;
-    readonly publicKey: CryptoKey;
-}
-
-declare var ScopedCredentialInfo: {
-    prototype: ScopedCredentialInfo;
-    new(): ScopedCredentialInfo;
-};
-
-interface ScreenEventMap {
-    "MSOrientationChange": Event;
-}
-
-interface Screen extends EventTarget {
-    readonly availHeight: number;
-    readonly availWidth: number;
-    /** @deprecated */
-    bufferDepth: number;
-    readonly colorDepth: number;
-    readonly deviceXDPI: number;
-    readonly deviceYDPI: number;
-    readonly fontSmoothingEnabled: boolean;
-    readonly height: number;
-    readonly logicalXDPI: number;
-    readonly logicalYDPI: number;
-    readonly msOrientation: string;
-    onmsorientationchange: ((this: Screen, ev: Event) => any) | null;
-    readonly pixelDepth: number;
-    readonly systemXDPI: number;
-    readonly systemYDPI: number;
-    readonly width: number;
-    lockOrientation(orientations: OrientationLockType | OrientationLockType[]): boolean;
-    msLockOrientation(orientations: string | string[]): boolean;
-    msUnlockOrientation(): void;
-    unlockOrientation(): void;
-    addEventListener<K extends keyof ScreenEventMap>(type: K, listener: (this: Screen, ev: ScreenEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof ScreenEventMap>(type: K, listener: (this: Screen, ev: ScreenEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var Screen: {
-    prototype: Screen;
-    new(): Screen;
-};
-
-interface ScriptProcessorNodeEventMap {
-    "audioprocess": AudioProcessingEvent;
-}
-
-interface ScriptProcessorNode extends AudioNode {
-    /** @deprecated */
-    readonly bufferSize: number;
-    /** @deprecated */
-    onaudioprocess: ((this: ScriptProcessorNode, ev: AudioProcessingEvent) => any) | null;
-    addEventListener<K extends keyof ScriptProcessorNodeEventMap>(type: K, listener: (this: ScriptProcessorNode, ev: ScriptProcessorNodeEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof ScriptProcessorNodeEventMap>(type: K, listener: (this: ScriptProcessorNode, ev: ScriptProcessorNodeEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var ScriptProcessorNode: {
-    prototype: ScriptProcessorNode;
-    new(): ScriptProcessorNode;
-};
-
-interface ScrollIntoViewOptions extends ScrollOptions {
-    block?: ScrollLogicalPosition;
-    inline?: ScrollLogicalPosition;
-}
-
-interface ScrollOptions {
-    behavior?: ScrollBehavior;
-}
-
-interface ScrollToOptions extends ScrollOptions {
-    left?: number;
-    top?: number;
-}
-
-interface SecurityPolicyViolationEvent extends Event {
-    readonly blockedURI: string;
-    readonly columnNumber: number;
-    readonly documentURI: string;
-    readonly effectiveDirective: string;
-    readonly lineNumber: number;
-    readonly originalPolicy: string;
-    readonly referrer: string;
-    readonly sourceFile: string;
-    readonly statusCode: number;
-    readonly violatedDirective: string;
-}
-
-declare var SecurityPolicyViolationEvent: {
-    prototype: SecurityPolicyViolationEvent;
-    new(type: string, eventInitDict?: SecurityPolicyViolationEventInit): SecurityPolicyViolationEvent;
-};
-
-interface Selection {
-    readonly anchorNode: Node;
-    readonly anchorOffset: number;
-    readonly baseNode: Node;
-    readonly baseOffset: number;
-    readonly extentNode: Node;
-    readonly extentOffset: number;
-    readonly focusNode: Node;
-    readonly focusOffset: number;
-    readonly isCollapsed: boolean;
-    readonly rangeCount: number;
-    readonly type: string;
-    addRange(range: Range): void;
-    collapse(parentNode: Node, offset: number): void;
-    collapseToEnd(): void;
-    collapseToStart(): void;
-    containsNode(node: Node, partlyContained: boolean): boolean;
-    deleteFromDocument(): void;
-    empty(): void;
-    extend(newNode: Node, offset: number): void;
-    getRangeAt(index: number): Range;
-    removeAllRanges(): void;
-    removeRange(range: Range): void;
-    selectAllChildren(parentNode: Node): void;
-    setBaseAndExtent(baseNode: Node, baseOffset: number, extentNode: Node, extentOffset: number): void;
-    setPosition(parentNode: Node, offset: number): void;
-    toString(): string;
-}
-
-declare var Selection: {
-    prototype: Selection;
-    new(): Selection;
-};
-
-interface ServiceUIFrameContext {
-    getCachedFrameMessage(key: string): string;
-    postFrameMessage(key: string, data: string): void;
-}
-declare var ServiceUIFrameContext: ServiceUIFrameContext;
-
-interface ServiceWorkerEventMap extends AbstractWorkerEventMap {
-    "statechange": Event;
-}
-
-interface ServiceWorker extends EventTarget, AbstractWorker {
-    onstatechange: ((this: ServiceWorker, ev: Event) => any) | null;
-    readonly scriptURL: string;
-    readonly state: ServiceWorkerState;
-    postMessage(message: any, transfer?: any[]): void;
-    addEventListener<K extends keyof ServiceWorkerEventMap>(type: K, listener: (this: ServiceWorker, ev: ServiceWorkerEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof ServiceWorkerEventMap>(type: K, listener: (this: ServiceWorker, ev: ServiceWorkerEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var ServiceWorker: {
-    prototype: ServiceWorker;
-    new(): ServiceWorker;
-};
-
-interface ServiceWorkerContainerEventMap {
-    "controllerchange": Event;
-    "message": ServiceWorkerMessageEvent;
-    "messageerror": MessageEvent;
-}
-
-interface ServiceWorkerContainer extends EventTarget {
-    readonly controller: ServiceWorker | null;
-    oncontrollerchange: ((this: ServiceWorkerContainer, ev: Event) => any) | null;
-    onmessage: ((this: ServiceWorkerContainer, ev: ServiceWorkerMessageEvent) => any) | null;
-    onmessageerror: ((this: ServiceWorkerContainer, ev: MessageEvent) => any) | null;
-    readonly ready: Promise<ServiceWorkerRegistration>;
-    getRegistration(clientURL?: string): Promise<ServiceWorkerRegistration | undefined>;
-    getRegistrations(): Promise<ServiceWorkerRegistration[]>;
-    register(scriptURL: string, options?: RegistrationOptions): Promise<ServiceWorkerRegistration>;
-    startMessages(): void;
-    addEventListener<K extends keyof ServiceWorkerContainerEventMap>(type: K, listener: (this: ServiceWorkerContainer, ev: ServiceWorkerContainerEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof ServiceWorkerContainerEventMap>(type: K, listener: (this: ServiceWorkerContainer, ev: ServiceWorkerContainerEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var ServiceWorkerContainer: {
-    prototype: ServiceWorkerContainer;
-    new(): ServiceWorkerContainer;
-};
-
-interface ServiceWorkerMessageEvent extends Event {
-    readonly data: any;
-    readonly lastEventId: string;
-    readonly origin: string;
-    readonly ports: ReadonlyArray<MessagePort> | null;
-    readonly source: ServiceWorker | MessagePort | null;
-}
-
-declare var ServiceWorkerMessageEvent: {
-    prototype: ServiceWorkerMessageEvent;
-    new(type: string, eventInitDict?: ServiceWorkerMessageEventInit): ServiceWorkerMessageEvent;
-};
-
-interface ServiceWorkerRegistrationEventMap {
-    "updatefound": Event;
-}
-
-interface ServiceWorkerRegistration extends EventTarget {
-    readonly active: ServiceWorker | null;
-    readonly installing: ServiceWorker | null;
-    onupdatefound: ((this: ServiceWorkerRegistration, ev: Event) => any) | null;
-    readonly pushManager: PushManager;
-    readonly scope: string;
-    readonly sync: SyncManager;
-    readonly waiting: ServiceWorker | null;
-    getNotifications(filter?: GetNotificationOptions): Promise<Notification[]>;
-    showNotification(title: string, options?: NotificationOptions): Promise<void>;
-    unregister(): Promise<boolean>;
-    update(): Promise<void>;
-    addEventListener<K extends keyof ServiceWorkerRegistrationEventMap>(type: K, listener: (this: ServiceWorkerRegistration, ev: ServiceWorkerRegistrationEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof ServiceWorkerRegistrationEventMap>(type: K, listener: (this: ServiceWorkerRegistration, ev: ServiceWorkerRegistrationEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var ServiceWorkerRegistration: {
-    prototype: ServiceWorkerRegistration;
-    new(): ServiceWorkerRegistration;
-};
-
-interface ShadowRoot extends DocumentOrShadowRoot, DocumentFragment {
-    readonly host: Element;
-    innerHTML: string;
-}
-
-interface ShadowRootInit {
-    delegatesFocus?: boolean;
-    mode: "open" | "closed";
-}
-
-interface SourceBuffer extends EventTarget {
-    appendWindowEnd: number;
-    appendWindowStart: number;
-    readonly audioTracks: AudioTrackList;
-    readonly buffered: TimeRanges;
-    mode: AppendMode;
-    readonly textTracks: TextTrackList;
-    timestampOffset: number;
-    readonly updating: boolean;
-    readonly videoTracks: VideoTrackList;
-    abort(): void;
-    appendBuffer(data: ArrayBuffer | Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | null): void;
-    appendStream(stream: MSStream, maxSize?: number): void;
-    remove(start: number, end: number): void;
-}
-
-declare var SourceBuffer: {
-    prototype: SourceBuffer;
-    new(): SourceBuffer;
-};
-
-interface SourceBufferList extends EventTarget {
-    readonly length: number;
-    item(index: number): SourceBuffer;
-    [index: number]: SourceBuffer;
-}
-
-declare var SourceBufferList: {
-    prototype: SourceBufferList;
-    new(): SourceBufferList;
-};
-
-interface SpeechSynthesisEventMap {
-    "voiceschanged": Event;
-}
-
-interface SpeechSynthesis extends EventTarget {
-    onvoiceschanged: ((this: SpeechSynthesis, ev: Event) => any) | null;
-    readonly paused: boolean;
-    readonly pending: boolean;
-    readonly speaking: boolean;
-    cancel(): void;
-    getVoices(): SpeechSynthesisVoice[];
-    pause(): void;
-    resume(): void;
-    speak(utterance: SpeechSynthesisUtterance): void;
-    addEventListener<K extends keyof SpeechSynthesisEventMap>(type: K, listener: (this: SpeechSynthesis, ev: SpeechSynthesisEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SpeechSynthesisEventMap>(type: K, listener: (this: SpeechSynthesis, ev: SpeechSynthesisEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SpeechSynthesis: {
-    prototype: SpeechSynthesis;
-    new(): SpeechSynthesis;
-};
-
-interface SpeechSynthesisEvent extends Event {
-    readonly charIndex: number;
-    readonly charLength: number;
-    readonly elapsedTime: number;
-    readonly name: string;
-    readonly utterance: SpeechSynthesisUtterance;
-}
-
-declare var SpeechSynthesisEvent: {
-    prototype: SpeechSynthesisEvent;
-    new(type: string, eventInitDict?: SpeechSynthesisEventInit): SpeechSynthesisEvent;
-};
-
-interface SpeechSynthesisUtteranceEventMap {
-    "boundary": Event;
-    "end": Event;
-    "error": Event;
-    "mark": Event;
-    "pause": Event;
-    "resume": Event;
-    "start": Event;
-}
-
-interface SpeechSynthesisUtterance extends EventTarget {
-    lang: string;
-    onboundary: ((this: SpeechSynthesisUtterance, ev: Event) => any) | null;
-    onend: ((this: SpeechSynthesisUtterance, ev: Event) => any) | null;
-    onerror: ((this: SpeechSynthesisUtterance, ev: Event) => any) | null;
-    onmark: ((this: SpeechSynthesisUtterance, ev: Event) => any) | null;
-    onpause: ((this: SpeechSynthesisUtterance, ev: Event) => any) | null;
-    onresume: ((this: SpeechSynthesisUtterance, ev: Event) => any) | null;
-    onstart: ((this: SpeechSynthesisUtterance, ev: Event) => any) | null;
-    pitch: number;
-    rate: number;
-    text: string;
-    voice: SpeechSynthesisVoice;
-    volume: number;
-    addEventListener<K extends keyof SpeechSynthesisUtteranceEventMap>(type: K, listener: (this: SpeechSynthesisUtterance, ev: SpeechSynthesisUtteranceEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SpeechSynthesisUtteranceEventMap>(type: K, listener: (this: SpeechSynthesisUtterance, ev: SpeechSynthesisUtteranceEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SpeechSynthesisUtterance: {
-    prototype: SpeechSynthesisUtterance;
-    new(): SpeechSynthesisUtterance;
-    new(text: string): SpeechSynthesisUtterance;
-};
-
-interface SpeechSynthesisVoice {
-    readonly default: boolean;
-    readonly lang: string;
-    readonly localService: boolean;
-    readonly name: string;
-    readonly voiceURI: string;
-}
-
-declare var SpeechSynthesisVoice: {
-    prototype: SpeechSynthesisVoice;
-    new(): SpeechSynthesisVoice;
-};
-
-interface StereoPannerNode extends AudioNode {
-    readonly pan: AudioParam;
-}
-
-declare var StereoPannerNode: {
-    prototype: StereoPannerNode;
-    new(): StereoPannerNode;
-};
-
-interface Storage {
-    readonly length: number;
-    clear(): void;
-    getItem(key: string): string | null;
-    key(index: number): string | null;
-    removeItem(key: string): void;
-    setItem(key: string, value: string): void;
-    [key: string]: any;
-}
-
-declare var Storage: {
-    prototype: Storage;
-    new(): Storage;
-};
-
-interface StorageEvent extends Event {
-    readonly key: string | null;
-    readonly newValue: string | null;
-    readonly oldValue: string | null;
-    readonly storageArea: Storage | null;
-    readonly url: string;
-}
-
-declare var StorageEvent: {
-    prototype: StorageEvent;
-    new (type: string, eventInitDict?: StorageEventInit): StorageEvent;
-};
-
-interface StorageEventInit extends EventInit {
-    key?: string;
-    newValue?: string;
-    oldValue?: string;
-    storageArea?: Storage;
-    url: string;
-}
-
-interface StyleMedia {
-    readonly type: string;
-    matchMedium(mediaquery: string): boolean;
-}
-
-declare var StyleMedia: {
-    prototype: StyleMedia;
-    new(): StyleMedia;
-};
-
-interface StyleSheet {
-    disabled: boolean;
-    readonly href: string | null;
-    readonly media: MediaList;
-    readonly ownerNode: Node;
-    readonly parentStyleSheet: StyleSheet | null;
-    readonly title: string | null;
-    readonly type: string;
-}
-
-declare var StyleSheet: {
-    prototype: StyleSheet;
-    new(): StyleSheet;
-};
-
-interface StyleSheetList {
-    readonly length: number;
-    item(index: number): StyleSheet | null;
-    [index: number]: StyleSheet;
-}
-
-declare var StyleSheetList: {
-    prototype: StyleSheetList;
-    new(): StyleSheetList;
-};
-
-interface SubtleCrypto {
-    decrypt(algorithm: string | RsaOaepParams | AesCtrParams | AesCbcParams | AesCmacParams | AesGcmParams | AesCfbParams, key: CryptoKey, data: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer): PromiseLike<ArrayBuffer>;
-    deriveBits(algorithm: string | EcdhKeyDeriveParams | DhKeyDeriveParams | ConcatParams | HkdfCtrParams | Pbkdf2Params, baseKey: CryptoKey, length: number): PromiseLike<ArrayBuffer>;
-    deriveKey(algorithm: string | EcdhKeyDeriveParams | DhKeyDeriveParams | ConcatParams | HkdfCtrParams | Pbkdf2Params, baseKey: CryptoKey, derivedKeyType: string | AesDerivedKeyParams | HmacImportParams | ConcatParams | HkdfCtrParams | Pbkdf2Params, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKey>;
-    digest(algorithm: string | Algorithm, data: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer): PromiseLike<ArrayBuffer>;
-    encrypt(algorithm: string | RsaOaepParams | AesCtrParams | AesCbcParams | AesCmacParams | AesGcmParams | AesCfbParams, key: CryptoKey, data: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer): PromiseLike<ArrayBuffer>;
-    exportKey(format: "jwk", key: CryptoKey): PromiseLike<JsonWebKey>;
-    exportKey(format: "raw" | "pkcs8" | "spki", key: CryptoKey): PromiseLike<ArrayBuffer>;
-    exportKey(format: string, key: CryptoKey): PromiseLike<JsonWebKey | ArrayBuffer>;
-    generateKey(algorithm: string, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKeyPair | CryptoKey>;
-    generateKey(algorithm: RsaHashedKeyGenParams | EcKeyGenParams | DhKeyGenParams, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKeyPair>;
-    generateKey(algorithm: AesKeyGenParams | HmacKeyGenParams | Pbkdf2Params, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKey>;
-    importKey(format: "jwk", keyData: JsonWebKey, algorithm: string | RsaHashedImportParams | EcKeyImportParams | HmacImportParams | DhImportKeyParams, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKey>;
-    importKey(format: "raw" | "pkcs8" | "spki", keyData: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer, algorithm: string | RsaHashedImportParams | EcKeyImportParams | HmacImportParams | DhImportKeyParams, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKey>;
-    importKey(format: string, keyData: JsonWebKey | Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer, algorithm: string | RsaHashedImportParams | EcKeyImportParams | HmacImportParams | DhImportKeyParams, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKey>;
-    sign(algorithm: string | RsaPssParams | EcdsaParams | AesCmacParams, key: CryptoKey, data: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer): PromiseLike<ArrayBuffer>;
-    unwrapKey(format: string, wrappedKey: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer, unwrappingKey: CryptoKey, unwrapAlgorithm: string | Algorithm, unwrappedKeyAlgorithm: string | Algorithm, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKey>;
-    verify(algorithm: string | RsaPssParams | EcdsaParams | AesCmacParams, key: CryptoKey, signature: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer, data: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer): PromiseLike<boolean>;
-    wrapKey(format: string, key: CryptoKey, wrappingKey: CryptoKey, wrapAlgorithm: string | Algorithm): PromiseLike<ArrayBuffer>;
-}
-
-declare var SubtleCrypto: {
-    prototype: SubtleCrypto;
-    new(): SubtleCrypto;
-};
-
-interface SyncManager {
-    getTags(): Promise<string[]>;
-    register(tag: string): Promise<void>;
-}
-
-declare var SyncManager: {
-    prototype: SyncManager;
-    new(): SyncManager;
-};
-
-interface Text extends CharacterData {
-    readonly assignedSlot: HTMLSlotElement | null;
-    readonly wholeText: string;
-    splitText(offset: number): Text;
-}
-
-declare var Text: {
-    prototype: Text;
-    new(data?: string): Text;
-};
-
-interface TextDecoder {
-    readonly encoding: string;
-    readonly fatal: boolean;
-    readonly ignoreBOM: boolean;
-    decode(input?: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null, options?: TextDecodeOptions): string;
-}
-
-declare var TextDecoder: {
-    prototype: TextDecoder;
-    new(label?: string, options?: TextDecoderOptions): TextDecoder;
-};
-
-interface TextEncoder {
-    readonly encoding: string;
-    encode(input?: string): Uint8Array;
-}
-
-declare var TextEncoder: {
-    prototype: TextEncoder;
-    new(): TextEncoder;
-};
-
-interface TextEvent extends UIEvent {
-    readonly data: string;
-    initTextEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, dataArg: string, inputMethod: number, locale: string): void;
-    readonly DOM_INPUT_METHOD_DROP: number;
-    readonly DOM_INPUT_METHOD_HANDWRITING: number;
-    readonly DOM_INPUT_METHOD_IME: number;
-    readonly DOM_INPUT_METHOD_KEYBOARD: number;
-    readonly DOM_INPUT_METHOD_MULTIMODAL: number;
-    readonly DOM_INPUT_METHOD_OPTION: number;
-    readonly DOM_INPUT_METHOD_PASTE: number;
-    readonly DOM_INPUT_METHOD_SCRIPT: number;
-    readonly DOM_INPUT_METHOD_UNKNOWN: number;
-    readonly DOM_INPUT_METHOD_VOICE: number;
-}
-
-declare var TextEvent: {
-    prototype: TextEvent;
-    new(): TextEvent;
-    readonly DOM_INPUT_METHOD_DROP: number;
-    readonly DOM_INPUT_METHOD_HANDWRITING: number;
-    readonly DOM_INPUT_METHOD_IME: number;
-    readonly DOM_INPUT_METHOD_KEYBOARD: number;
-    readonly DOM_INPUT_METHOD_MULTIMODAL: number;
-    readonly DOM_INPUT_METHOD_OPTION: number;
-    readonly DOM_INPUT_METHOD_PASTE: number;
-    readonly DOM_INPUT_METHOD_SCRIPT: number;
-    readonly DOM_INPUT_METHOD_UNKNOWN: number;
-    readonly DOM_INPUT_METHOD_VOICE: number;
-};
-
-interface TextMetrics {
-    readonly width: number;
-}
-
-declare var TextMetrics: {
-    prototype: TextMetrics;
-    new(): TextMetrics;
-};
-
-interface TextTrackEventMap {
-    "cuechange": Event;
-    "error": Event;
-    "load": Event;
-}
-
-interface TextTrack extends EventTarget {
-    readonly activeCues: TextTrackCueList;
-    readonly cues: TextTrackCueList;
-    readonly inBandMetadataTrackDispatchType: string;
-    readonly kind: string;
-    readonly label: string;
-    readonly language: string;
-    mode: TextTrackMode | number;
-    oncuechange: ((this: TextTrack, ev: Event) => any) | null;
-    onerror: ((this: TextTrack, ev: Event) => any) | null;
-    onload: ((this: TextTrack, ev: Event) => any) | null;
-    readonly readyState: number;
-    addCue(cue: TextTrackCue): void;
-    removeCue(cue: TextTrackCue): void;
-    readonly DISABLED: number;
-    readonly ERROR: number;
-    readonly HIDDEN: number;
-    readonly LOADED: number;
-    readonly LOADING: number;
-    readonly NONE: number;
-    readonly SHOWING: number;
-    addEventListener<K extends keyof TextTrackEventMap>(type: K, listener: (this: TextTrack, ev: TextTrackEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof TextTrackEventMap>(type: K, listener: (this: TextTrack, ev: TextTrackEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var TextTrack: {
-    prototype: TextTrack;
-    new(): TextTrack;
-    readonly DISABLED: number;
-    readonly ERROR: number;
-    readonly HIDDEN: number;
-    readonly LOADED: number;
-    readonly LOADING: number;
-    readonly NONE: number;
-    readonly SHOWING: number;
-};
-
-interface TextTrackCueEventMap {
-    "enter": Event;
-    "exit": Event;
-}
-
-interface TextTrackCue extends EventTarget {
-    endTime: number;
-    id: string;
-    onenter: ((this: TextTrackCue, ev: Event) => any) | null;
-    onexit: ((this: TextTrackCue, ev: Event) => any) | null;
-    pauseOnExit: boolean;
-    startTime: number;
-    text: string;
-    readonly track: TextTrack;
-    getCueAsHTML(): DocumentFragment;
-    addEventListener<K extends keyof TextTrackCueEventMap>(type: K, listener: (this: TextTrackCue, ev: TextTrackCueEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof TextTrackCueEventMap>(type: K, listener: (this: TextTrackCue, ev: TextTrackCueEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var TextTrackCue: {
-    prototype: TextTrackCue;
-    new(startTime: number, endTime: number, text: string): TextTrackCue;
-};
-
-interface TextTrackCueList {
-    readonly length: number;
-    getCueById(id: string): TextTrackCue;
-    item(index: number): TextTrackCue;
-    [index: number]: TextTrackCue;
-}
-
-declare var TextTrackCueList: {
-    prototype: TextTrackCueList;
-    new(): TextTrackCueList;
-};
-
-interface TextTrackListEventMap {
-    "addtrack": TrackEvent;
-}
-
-interface TextTrackList extends EventTarget {
-    readonly length: number;
-    onaddtrack: ((this: TextTrackList, ev: TrackEvent) => any) | null;
-    item(index: number): TextTrack;
-    addEventListener<K extends keyof TextTrackListEventMap>(type: K, listener: (this: TextTrackList, ev: TextTrackListEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof TextTrackListEventMap>(type: K, listener: (this: TextTrackList, ev: TextTrackListEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-    [index: number]: TextTrack;
-}
-
-declare var TextTrackList: {
-    prototype: TextTrackList;
-    new(): TextTrackList;
-};
-
-interface TimeRanges {
-    readonly length: number;
-    end(index: number): number;
-    start(index: number): number;
-}
-
-declare var TimeRanges: {
-    prototype: TimeRanges;
-    new(): TimeRanges;
-};
-
-interface Touch {
-    readonly clientX: number;
-    readonly clientY: number;
-    readonly identifier: number;
-    readonly pageX: number;
-    readonly pageY: number;
-    readonly screenX: number;
-    readonly screenY: number;
-    readonly target: EventTarget;
-}
-
-declare var Touch: {
-    prototype: Touch;
-    new(): Touch;
-};
-
-interface TouchEvent extends UIEvent {
-    readonly altKey: boolean;
-    readonly changedTouches: TouchList;
-    readonly charCode: number;
-    readonly ctrlKey: boolean;
-    readonly keyCode: number;
-    readonly metaKey: boolean;
-    readonly shiftKey: boolean;
-    readonly targetTouches: TouchList;
-    readonly touches: TouchList;
-    /** @deprecated */
-    readonly which: number;
-}
-
-declare var TouchEvent: {
-    prototype: TouchEvent;
-    new(type: string, touchEventInit?: TouchEventInit): TouchEvent;
-};
-
-interface TouchEventInit extends EventModifierInit {
-    changedTouches?: Touch[];
-    targetTouches?: Touch[];
-    touches?: Touch[];
-}
-
-interface TouchList {
-    readonly length: number;
-    item(index: number): Touch | null;
-    [index: number]: Touch;
-}
-
-declare var TouchList: {
-    prototype: TouchList;
-    new(): TouchList;
-};
-
-interface TrackEvent extends Event {
-    readonly track: VideoTrack | AudioTrack | TextTrack | null;
-}
-
-declare var TrackEvent: {
-    prototype: TrackEvent;
-    new(typeArg: string, eventInitDict?: TrackEventInit): TrackEvent;
-};
-
-interface TransitionEvent extends Event {
-    readonly elapsedTime: number;
-    readonly propertyName: string;
-    initTransitionEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, propertyNameArg: string, elapsedTimeArg: number): void;
-}
-
-declare var TransitionEvent: {
-    prototype: TransitionEvent;
-    new(typeArg: string, eventInitDict?: TransitionEventInit): TransitionEvent;
-};
-
-interface TreeWalker {
-    currentNode: Node;
-    /** @deprecated */
-    readonly expandEntityReferences: boolean;
-    readonly filter: NodeFilter | null;
-    readonly root: Node;
-    readonly whatToShow: number;
-    firstChild(): Node | null;
-    lastChild(): Node | null;
-    nextNode(): Node | null;
-    nextSibling(): Node | null;
-    parentNode(): Node | null;
-    previousNode(): Node | null;
-    previousSibling(): Node | null;
-}
-
-declare var TreeWalker: {
-    prototype: TreeWalker;
-    new(): TreeWalker;
-};
-
-interface UIEvent extends Event {
-    readonly detail: number;
-    readonly view: Window;
-    initUIEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number): void;
-}
-
-declare var UIEvent: {
-    prototype: UIEvent;
-    new(typeArg: string, eventInitDict?: UIEventInit): UIEvent;
-};
-
-interface URL {
-    hash: string;
-    host: string;
-    hostname: string;
-    href: string;
-    readonly origin: string;
-    password: string;
-    pathname: string;
-    port: string;
-    protocol: string;
-    search: string;
-    readonly searchParams: URLSearchParams;
-    username: string;
-    toString(): string;
-}
-
-declare var URL: {
-    prototype: URL;
-    new(url: string, base?: string | URL): URL;
-    createObjectURL(object: any, options?: ObjectURLOptions): string;
-    revokeObjectURL(url: string): void;
-};
-
-interface URLSearchParams {
-    /**
-     * Appends a specified key/value pair as a new search parameter.
-     */
-    append(name: string, value: string): void;
-    /**
-     * Deletes the given search parameter, and its associated value, from the list of all search parameters.
-     */
-    delete(name: string): void;
-    /**
-     * Returns the first value associated to the given search parameter.
-     */
-    get(name: string): string | null;
-    /**
-     * Returns all the values association with a given search parameter.
-     */
-    getAll(name: string): string[];
-    /**
-     * Returns a Boolean indicating if such a search parameter exists.
-     */
-    has(name: string): boolean;
-    /**
-     * Sets the value associated to a given search parameter to the given value. If there were several values, delete the others.
-     */
-    set(name: string, value: string): void;
-}
-
-declare var URLSearchParams: {
-    prototype: URLSearchParams;
-    new (init?: string | URLSearchParams): URLSearchParams;
-};
-
-interface VRDisplay extends EventTarget {
-    readonly capabilities: VRDisplayCapabilities;
-    depthFar: number;
-    depthNear: number;
-    readonly displayId: number;
-    readonly displayName: string;
-    readonly isConnected: boolean;
-    readonly isPresenting: boolean;
-    readonly stageParameters: VRStageParameters | null;
-    cancelAnimationFrame(handle: number): void;
-    exitPresent(): Promise<void>;
-    getEyeParameters(whichEye: string): VREyeParameters;
-    getFrameData(frameData: VRFrameData): boolean;
-    getLayers(): VRLayer[];
-    /** @deprecated */
-    getPose(): VRPose;
-    requestAnimationFrame(callback: FrameRequestCallback): number;
-    requestPresent(layers: VRLayer[]): Promise<void>;
-    resetPose(): void;
-    submitFrame(pose?: VRPose): void;
-}
-
-declare var VRDisplay: {
-    prototype: VRDisplay;
-    new(): VRDisplay;
-};
-
-interface VRDisplayCapabilities {
-    readonly canPresent: boolean;
-    readonly hasExternalDisplay: boolean;
-    readonly hasOrientation: boolean;
-    readonly hasPosition: boolean;
-    readonly maxLayers: number;
-}
-
-declare var VRDisplayCapabilities: {
-    prototype: VRDisplayCapabilities;
-    new(): VRDisplayCapabilities;
-};
-
-interface VRDisplayEvent extends Event {
-    readonly display: VRDisplay;
-    readonly reason: VRDisplayEventReason | null;
-}
-
-declare var VRDisplayEvent: {
-    prototype: VRDisplayEvent;
-    new(type: string, eventInitDict: VRDisplayEventInit): VRDisplayEvent;
-};
-
-interface VREyeParameters {
-    /** @deprecated */
-    readonly fieldOfView: VRFieldOfView;
-    readonly offset: Float32Array;
-    readonly renderHeight: number;
-    readonly renderWidth: number;
-}
-
-declare var VREyeParameters: {
-    prototype: VREyeParameters;
-    new(): VREyeParameters;
-};
-
-interface VRFieldOfView {
-    readonly downDegrees: number;
-    readonly leftDegrees: number;
-    readonly rightDegrees: number;
-    readonly upDegrees: number;
-}
-
-declare var VRFieldOfView: {
-    prototype: VRFieldOfView;
-    new(): VRFieldOfView;
-};
-
-interface VRFrameData {
-    readonly leftProjectionMatrix: Float32Array;
-    readonly leftViewMatrix: Float32Array;
-    readonly pose: VRPose;
-    readonly rightProjectionMatrix: Float32Array;
-    readonly rightViewMatrix: Float32Array;
-    readonly timestamp: number;
-}
-
-declare var VRFrameData: {
-    prototype: VRFrameData;
-    new(): VRFrameData;
-};
-
-interface VRPose {
-    readonly angularAcceleration: Float32Array | null;
-    readonly angularVelocity: Float32Array | null;
-    readonly linearAcceleration: Float32Array | null;
-    readonly linearVelocity: Float32Array | null;
-    readonly orientation: Float32Array | null;
-    readonly position: Float32Array | null;
-    readonly timestamp: number;
-}
-
-declare var VRPose: {
-    prototype: VRPose;
-    new(): VRPose;
-};
-
-interface ValidityState {
-    readonly badInput: boolean;
-    readonly customError: boolean;
-    readonly patternMismatch: boolean;
-    readonly rangeOverflow: boolean;
-    readonly rangeUnderflow: boolean;
-    readonly stepMismatch: boolean;
-    readonly tooLong: boolean;
-    readonly tooShort: boolean;
-    readonly typeMismatch: boolean;
-    readonly valid: boolean;
-    readonly valueMissing: boolean;
-}
-
-declare var ValidityState: {
-    prototype: ValidityState;
-    new(): ValidityState;
-};
-
-interface VideoPlaybackQuality {
-    readonly corruptedVideoFrames: number;
-    readonly creationTime: number;
-    readonly droppedVideoFrames: number;
-    readonly totalFrameDelay: number;
-    readonly totalVideoFrames: number;
-}
-
-declare var VideoPlaybackQuality: {
-    prototype: VideoPlaybackQuality;
-    new(): VideoPlaybackQuality;
-};
-
-interface VideoTrack {
-    readonly id: string;
-    kind: string;
-    readonly label: string;
-    language: string;
-    selected: boolean;
-    readonly sourceBuffer: SourceBuffer;
-}
-
-declare var VideoTrack: {
-    prototype: VideoTrack;
-    new(): VideoTrack;
-};
-
-interface VideoTrackListEventMap {
-    "addtrack": TrackEvent;
-    "change": Event;
-    "removetrack": TrackEvent;
-}
-
-interface VideoTrackList extends EventTarget {
-    readonly length: number;
-    onaddtrack: ((this: VideoTrackList, ev: TrackEvent) => any) | null;
-    onchange: ((this: VideoTrackList, ev: Event) => any) | null;
-    onremovetrack: ((this: VideoTrackList, ev: TrackEvent) => any) | null;
-    readonly selectedIndex: number;
-    getTrackById(id: string): VideoTrack | null;
-    item(index: number): VideoTrack;
-    addEventListener<K extends keyof VideoTrackListEventMap>(type: K, listener: (this: VideoTrackList, ev: VideoTrackListEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof VideoTrackListEventMap>(type: K, listener: (this: VideoTrackList, ev: VideoTrackListEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-    [index: number]: VideoTrack;
-}
-
-declare var VideoTrackList: {
-    prototype: VideoTrackList;
-    new(): VideoTrackList;
-};
-
-interface WEBGL_color_buffer_float {
-    readonly FRAMEBUFFER_ATTACHMENT_COMPONENT_TYPE_EXT: number;
-    readonly RGB32F_EXT: number;
-    readonly RGBA32F_EXT: number;
-    readonly UNSIGNED_NORMALIZED_EXT: number;
-}
-
-interface WEBGL_compressed_texture_astc {
-    readonly COMPRESSED_RGBA_ASTC_10x10_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_10x5_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_10x6_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_10x8_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_12x10_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_12x12_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_4x4_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_5x4_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_5x5_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_6x5_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_6x6_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_8x5_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_8x6_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_8x8_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_10x10_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_10x5_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_10x6_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_10x8_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_12x10_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_12x12_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_4x4_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_5x4_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_5x5_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_6x5_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_6x6_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_8x5_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_8x6_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_8x8_KHR: number;
-    getSupportedProfiles(): string[];
-}
-
-interface WEBGL_compressed_texture_s3tc {
-    readonly COMPRESSED_RGBA_S3TC_DXT1_EXT: number;
-    readonly COMPRESSED_RGBA_S3TC_DXT3_EXT: number;
-    readonly COMPRESSED_RGBA_S3TC_DXT5_EXT: number;
-    readonly COMPRESSED_RGB_S3TC_DXT1_EXT: number;
-}
-
-declare var WEBGL_compressed_texture_s3tc: {
-    prototype: WEBGL_compressed_texture_s3tc;
-    new(): WEBGL_compressed_texture_s3tc;
-    readonly COMPRESSED_RGBA_S3TC_DXT1_EXT: number;
-    readonly COMPRESSED_RGBA_S3TC_DXT3_EXT: number;
-    readonly COMPRESSED_RGBA_S3TC_DXT5_EXT: number;
-    readonly COMPRESSED_RGB_S3TC_DXT1_EXT: number;
-};
-
-interface WEBGL_compressed_texture_s3tc_srgb {
-    readonly COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT: number;
-    readonly COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT: number;
-    readonly COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT: number;
-    readonly COMPRESSED_SRGB_S3TC_DXT1_EXT: number;
-}
-
-interface WEBGL_debug_renderer_info {
-    readonly UNMASKED_RENDERER_WEBGL: number;
-    readonly UNMASKED_VENDOR_WEBGL: number;
-}
-
-declare var WEBGL_debug_renderer_info: {
-    prototype: WEBGL_debug_renderer_info;
-    new(): WEBGL_debug_renderer_info;
-    readonly UNMASKED_RENDERER_WEBGL: number;
-    readonly UNMASKED_VENDOR_WEBGL: number;
-};
-
-interface WEBGL_debug_shaders {
-    getTranslatedShaderSource(shader: WebGLShader): string;
-}
-
-interface WEBGL_depth_texture {
-    readonly UNSIGNED_INT_24_8_WEBGL: number;
-}
-
-declare var WEBGL_depth_texture: {
-    prototype: WEBGL_depth_texture;
-    new(): WEBGL_depth_texture;
-    readonly UNSIGNED_INT_24_8_WEBGL: number;
-};
-
-interface WEBGL_draw_buffers {
-    readonly COLOR_ATTACHMENT0_WEBGL: number;
-    readonly COLOR_ATTACHMENT10_WEBGL: number;
-    readonly COLOR_ATTACHMENT11_WEBGL: number;
-    readonly COLOR_ATTACHMENT12_WEBGL: number;
-    readonly COLOR_ATTACHMENT13_WEBGL: number;
-    readonly COLOR_ATTACHMENT14_WEBGL: number;
-    readonly COLOR_ATTACHMENT15_WEBGL: number;
-    readonly COLOR_ATTACHMENT1_WEBGL: number;
-    readonly COLOR_ATTACHMENT2_WEBGL: number;
-    readonly COLOR_ATTACHMENT3_WEBGL: number;
-    readonly COLOR_ATTACHMENT4_WEBGL: number;
-    readonly COLOR_ATTACHMENT5_WEBGL: number;
-    readonly COLOR_ATTACHMENT6_WEBGL: number;
-    readonly COLOR_ATTACHMENT7_WEBGL: number;
-    readonly COLOR_ATTACHMENT8_WEBGL: number;
-    readonly COLOR_ATTACHMENT9_WEBGL: number;
-    readonly DRAW_BUFFER0_WEBGL: number;
-    readonly DRAW_BUFFER10_WEBGL: number;
-    readonly DRAW_BUFFER11_WEBGL: number;
-    readonly DRAW_BUFFER12_WEBGL: number;
-    readonly DRAW_BUFFER13_WEBGL: number;
-    readonly DRAW_BUFFER14_WEBGL: number;
-    readonly DRAW_BUFFER15_WEBGL: number;
-    readonly DRAW_BUFFER1_WEBGL: number;
-    readonly DRAW_BUFFER2_WEBGL: number;
-    readonly DRAW_BUFFER3_WEBGL: number;
-    readonly DRAW_BUFFER4_WEBGL: number;
-    readonly DRAW_BUFFER5_WEBGL: number;
-    readonly DRAW_BUFFER6_WEBGL: number;
-    readonly DRAW_BUFFER7_WEBGL: number;
-    readonly DRAW_BUFFER8_WEBGL: number;
-    readonly DRAW_BUFFER9_WEBGL: number;
-    readonly MAX_COLOR_ATTACHMENTS_WEBGL: number;
-    readonly MAX_DRAW_BUFFERS_WEBGL: number;
-    drawBuffersWEBGL(buffers: number[]): void;
-}
-
-interface WEBGL_lose_context {
-    loseContext(): void;
-    restoreContext(): void;
-}
-
-interface WaveShaperNode extends AudioNode {
-    curve: Float32Array | null;
-    oversample: OverSampleType;
-}
-
-declare var WaveShaperNode: {
-    prototype: WaveShaperNode;
-    new(): WaveShaperNode;
-};
-
-interface WebAuthentication {
-    getAssertion(assertionChallenge: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null, options?: AssertionOptions): Promise<WebAuthnAssertion>;
-    makeCredential(accountInformation: Account, cryptoParameters: ScopedCredentialParameters[], attestationChallenge: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null, options?: ScopedCredentialOptions): Promise<ScopedCredentialInfo>;
-}
-
-declare var WebAuthentication: {
-    prototype: WebAuthentication;
-    new(): WebAuthentication;
-};
-
-interface WebAuthnAssertion {
-    readonly authenticatorData: ArrayBuffer;
-    readonly clientData: ArrayBuffer;
-    readonly credential: ScopedCredential;
-    readonly signature: ArrayBuffer;
-}
-
-declare var WebAuthnAssertion: {
-    prototype: WebAuthnAssertion;
-    new(): WebAuthnAssertion;
-};
-
-interface WebGLActiveInfo {
-    readonly name: string;
-    readonly size: number;
-    readonly type: number;
-}
-
-declare var WebGLActiveInfo: {
-    prototype: WebGLActiveInfo;
-    new(): WebGLActiveInfo;
-};
-
-interface WebGLBuffer extends WebGLObject {
-}
-
-declare var WebGLBuffer: {
-    prototype: WebGLBuffer;
-    new(): WebGLBuffer;
-};
-
-interface WebGLContextEvent extends Event {
-    readonly statusMessage: string;
-}
-
-declare var WebGLContextEvent: {
-    prototype: WebGLContextEvent;
-    new(typeArg: string, eventInitDict?: WebGLContextEventInit): WebGLContextEvent;
-};
-
-interface WebGLFramebuffer extends WebGLObject {
-}
-
-declare var WebGLFramebuffer: {
-    prototype: WebGLFramebuffer;
-    new(): WebGLFramebuffer;
-};
-
-interface WebGLObject {
-}
-
-declare var WebGLObject: {
-    prototype: WebGLObject;
-    new(): WebGLObject;
-};
-
-interface WebGLProgram extends WebGLObject {
-}
-
-declare var WebGLProgram: {
-    prototype: WebGLProgram;
-    new(): WebGLProgram;
-};
-
-interface WebGLRenderbuffer extends WebGLObject {
-}
-
-declare var WebGLRenderbuffer: {
-    prototype: WebGLRenderbuffer;
-    new(): WebGLRenderbuffer;
-};
-
-interface WebGLRenderingContext {
-    readonly canvas: HTMLCanvasElement;
-    readonly drawingBufferHeight: number;
-    readonly drawingBufferWidth: number;
-    activeTexture(texture: number): void;
-    attachShader(program: WebGLProgram | null, shader: WebGLShader | null): void;
-    bindAttribLocation(program: WebGLProgram | null, index: number, name: string): void;
-    bindBuffer(target: number, buffer: WebGLBuffer | null): void;
-    bindFramebuffer(target: number, framebuffer: WebGLFramebuffer | null): void;
-    bindRenderbuffer(target: number, renderbuffer: WebGLRenderbuffer | null): void;
-    bindTexture(target: number, texture: WebGLTexture | null): void;
-    blendColor(red: number, green: number, blue: number, alpha: number): void;
-    blendEquation(mode: number): void;
-    blendEquationSeparate(modeRGB: number, modeAlpha: number): void;
-    blendFunc(sfactor: number, dfactor: number): void;
-    blendFuncSeparate(srcRGB: number, dstRGB: number, srcAlpha: number, dstAlpha: number): void;
-    bufferData(target: number, size: number | Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null, usage: number): void;
-    bufferSubData(target: number, offset: number, data: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null): void;
-    checkFramebufferStatus(target: number): number;
-    clear(mask: number): void;
-    clearColor(red: number, green: number, blue: number, alpha: number): void;
-    clearDepth(depth: number): void;
-    clearStencil(s: number): void;
-    colorMask(red: boolean, green: boolean, blue: boolean, alpha: boolean): void;
-    compileShader(shader: WebGLShader | null): void;
-    compressedTexImage2D(target: number, level: number, internalformat: number, width: number, height: number, border: number, data: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | null): void;
-    compressedTexSubImage2D(target: number, level: number, xoffset: number, yoffset: number, width: number, height: number, format: number, data: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | null): void;
-    copyTexImage2D(target: number, level: number, internalformat: number, x: number, y: number, width: number, height: number, border: number): void;
-    copyTexSubImage2D(target: number, level: number, xoffset: number, yoffset: number, x: number, y: number, width: number, height: number): void;
-    createBuffer(): WebGLBuffer | null;
-    createFramebuffer(): WebGLFramebuffer | null;
-    createProgram(): WebGLProgram | null;
-    createRenderbuffer(): WebGLRenderbuffer | null;
-    createShader(type: number): WebGLShader | null;
-    createTexture(): WebGLTexture | null;
-    cullFace(mode: number): void;
-    deleteBuffer(buffer: WebGLBuffer | null): void;
-    deleteFramebuffer(framebuffer: WebGLFramebuffer | null): void;
-    deleteProgram(program: WebGLProgram | null): void;
-    deleteRenderbuffer(renderbuffer: WebGLRenderbuffer | null): void;
-    deleteShader(shader: WebGLShader | null): void;
-    deleteTexture(texture: WebGLTexture | null): void;
-    depthFunc(func: number): void;
-    depthMask(flag: boolean): void;
-    depthRange(zNear: number, zFar: number): void;
-    detachShader(program: WebGLProgram | null, shader: WebGLShader | null): void;
-    disable(cap: number): void;
-    disableVertexAttribArray(index: number): void;
-    drawArrays(mode: number, first: number, count: number): void;
-    drawElements(mode: number, count: number, type: number, offset: number): void;
-    enable(cap: number): void;
-    enableVertexAttribArray(index: number): void;
-    finish(): void;
-    flush(): void;
-    framebufferRenderbuffer(target: number, attachment: number, renderbuffertarget: number, renderbuffer: WebGLRenderbuffer | null): void;
-    framebufferTexture2D(target: number, attachment: number, textarget: number, texture: WebGLTexture | null, level: number): void;
-    frontFace(mode: number): void;
-    generateMipmap(target: number): void;
-    getActiveAttrib(program: WebGLProgram | null, index: number): WebGLActiveInfo | null;
-    getActiveUniform(program: WebGLProgram | null, index: number): WebGLActiveInfo | null;
-    getAttachedShaders(program: WebGLProgram | null): WebGLShader[] | null;
-    getAttribLocation(program: WebGLProgram | null, name: string): number;
-    getBufferParameter(target: number, pname: number): any;
-    getContextAttributes(): WebGLContextAttributes;
-    getError(): number;
-    getExtension(extensionName: "EXT_blend_minmax"): EXT_blend_minmax | null;
-    getExtension(extensionName: "EXT_texture_filter_anisotropic"): EXT_texture_filter_anisotropic | null;
-    getExtension(extensionName: "EXT_frag_depth"): EXT_frag_depth | null;
-    getExtension(extensionName: "EXT_shader_texture_lod"): EXT_shader_texture_lod | null;
-    getExtension(extensionName: "EXT_sRGB"): EXT_sRGB | null;
-    getExtension(extensionName: "OES_vertex_array_object"): OES_vertex_array_object | null;
-    getExtension(extensionName: "WEBGL_color_buffer_float"): WEBGL_color_buffer_float | null;
-    getExtension(extensionName: "WEBGL_compressed_texture_astc"): WEBGL_compressed_texture_astc | null;
-    getExtension(extensionName: "WEBGL_compressed_texture_s3tc_srgb"): WEBGL_compressed_texture_s3tc_srgb | null;
-    getExtension(extensionName: "WEBGL_debug_shaders"): WEBGL_debug_shaders | null;
-    getExtension(extensionName: "WEBGL_draw_buffers"): WEBGL_draw_buffers | null;
-    getExtension(extensionName: "WEBGL_lose_context"): WEBGL_lose_context | null;
-    getExtension(extensionName: "WEBGL_depth_texture"): WEBGL_depth_texture | null;
-    getExtension(extensionName: "WEBGL_debug_renderer_info"): WEBGL_debug_renderer_info | null;
-    getExtension(extensionName: "WEBGL_compressed_texture_s3tc"): WEBGL_compressed_texture_s3tc | null;
-    getExtension(extensionName: "OES_texture_half_float_linear"): OES_texture_half_float_linear | null;
-    getExtension(extensionName: "OES_texture_half_float"): OES_texture_half_float | null;
-    getExtension(extensionName: "OES_texture_float_linear"): OES_texture_float_linear | null;
-    getExtension(extensionName: "OES_texture_float"): OES_texture_float | null;
-    getExtension(extensionName: "OES_standard_derivatives"): OES_standard_derivatives | null;
-    getExtension(extensionName: "OES_element_index_uint"): OES_element_index_uint | null;
-    getExtension(extensionName: "ANGLE_instanced_arrays"): ANGLE_instanced_arrays | null;
-    getExtension(extensionName: string): any;
-    getFramebufferAttachmentParameter(target: number, attachment: number, pname: number): any;
-    getParameter(pname: number): any;
-    getProgramInfoLog(program: WebGLProgram | null): string | null;
-    getProgramParameter(program: WebGLProgram | null, pname: number): any;
-    getRenderbufferParameter(target: number, pname: number): any;
-    getShaderInfoLog(shader: WebGLShader | null): string | null;
-    getShaderParameter(shader: WebGLShader | null, pname: number): any;
-    getShaderPrecisionFormat(shadertype: number, precisiontype: number): WebGLShaderPrecisionFormat | null;
-    getShaderSource(shader: WebGLShader | null): string | null;
-    getSupportedExtensions(): string[] | null;
-    getTexParameter(target: number, pname: number): any;
-    getUniform(program: WebGLProgram | null, location: WebGLUniformLocation | null): any;
-    getUniformLocation(program: WebGLProgram | null, name: string): WebGLUniformLocation | null;
-    getVertexAttrib(index: number, pname: number): any;
-    getVertexAttribOffset(index: number, pname: number): number;
-    hint(target: number, mode: number): void;
-    isBuffer(buffer: WebGLBuffer | null): boolean;
-    isContextLost(): boolean;
-    isEnabled(cap: number): boolean;
-    isFramebuffer(framebuffer: WebGLFramebuffer | null): boolean;
-    isProgram(program: WebGLProgram | null): boolean;
-    isRenderbuffer(renderbuffer: WebGLRenderbuffer | null): boolean;
-    isShader(shader: WebGLShader | null): boolean;
-    isTexture(texture: WebGLTexture | null): boolean;
-    lineWidth(width: number): void;
-    linkProgram(program: WebGLProgram | null): void;
-    pixelStorei(pname: number, param: number | boolean): void;
-    polygonOffset(factor: number, units: number): void;
-    readPixels(x: number, y: number, width: number, height: number, format: number, type: number, pixels: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | null): void;
-    renderbufferStorage(target: number, internalformat: number, width: number, height: number): void;
-    sampleCoverage(value: number, invert: boolean): void;
-    scissor(x: number, y: number, width: number, height: number): void;
-    shaderSource(shader: WebGLShader | null, source: string): void;
-    stencilFunc(func: number, ref: number, mask: number): void;
-    stencilFuncSeparate(face: number, func: number, ref: number, mask: number): void;
-    stencilMask(mask: number): void;
-    stencilMaskSeparate(face: number, mask: number): void;
-    stencilOp(fail: number, zfail: number, zpass: number): void;
-    stencilOpSeparate(face: number, fail: number, zfail: number, zpass: number): void;
-    texImage2D(target: number, level: number, internalformat: number, width: number, height: number, border: number, format: number, type: number, pixels: ArrayBufferView | null): void;
-    texImage2D(target: number, level: number, internalformat: number, format: number, type: number, pixels: ImageBitmap | ImageData | HTMLVideoElement | HTMLImageElement | HTMLCanvasElement): void;
-    texParameterf(target: number, pname: number, param: number): void;
-    texParameteri(target: number, pname: number, param: number): void;
-    texSubImage2D(target: number, level: number, xoffset: number, yoffset: number, width: number, height: number, format: number, type: number, pixels: ArrayBufferView | null): void;
-    texSubImage2D(target: number, level: number, xoffset: number, yoffset: number, format: number, type: number, pixels: ImageBitmap | ImageData | HTMLVideoElement | HTMLImageElement | HTMLCanvasElement): void;
-    uniform1f(location: WebGLUniformLocation | null, x: number): void;
-    uniform1fv(location: WebGLUniformLocation | null, v: Float32Array | ArrayLike<number>): void;
-    uniform1i(location: WebGLUniformLocation | null, x: number): void;
-    uniform1iv(location: WebGLUniformLocation | null, v: Int32Array | ArrayLike<number>): void;
-    uniform2f(location: WebGLUniformLocation | null, x: number, y: number): void;
-    uniform2fv(location: WebGLUniformLocation | null, v: Float32Array | ArrayLike<number>): void;
-    uniform2i(location: WebGLUniformLocation | null, x: number, y: number): void;
-    uniform2iv(location: WebGLUniformLocation | null, v: Int32Array | ArrayLike<number>): void;
-    uniform3f(location: WebGLUniformLocation | null, x: number, y: number, z: number): void;
-    uniform3fv(location: WebGLUniformLocation | null, v: Float32Array | ArrayLike<number>): void;
-    uniform3i(location: WebGLUniformLocation | null, x: number, y: number, z: number): void;
-    uniform3iv(location: WebGLUniformLocation | null, v: Int32Array | ArrayLike<number>): void;
-    uniform4f(location: WebGLUniformLocation | null, x: number, y: number, z: number, w: number): void;
-    uniform4fv(location: WebGLUniformLocation | null, v: Float32Array | ArrayLike<number>): void;
-    uniform4i(location: WebGLUniformLocation | null, x: number, y: number, z: number, w: number): void;
-    uniform4iv(location: WebGLUniformLocation | null, v: Int32Array | ArrayLike<number>): void;
-    uniformMatrix2fv(location: WebGLUniformLocation | null, transpose: boolean, value: Float32Array | ArrayLike<number>): void;
-    uniformMatrix3fv(location: WebGLUniformLocation | null, transpose: boolean, value: Float32Array | ArrayLike<number>): void;
-    uniformMatrix4fv(location: WebGLUniformLocation | null, transpose: boolean, value: Float32Array | ArrayLike<number>): void;
-    useProgram(program: WebGLProgram | null): void;
-    validateProgram(program: WebGLProgram | null): void;
-    vertexAttrib1f(indx: number, x: number): void;
-    vertexAttrib1fv(indx: number, values: Float32Array | number[]): void;
-    vertexAttrib2f(indx: number, x: number, y: number): void;
-    vertexAttrib2fv(indx: number, values: Float32Array | number[]): void;
-    vertexAttrib3f(indx: number, x: number, y: number, z: number): void;
-    vertexAttrib3fv(indx: number, values: Float32Array | number[]): void;
-    vertexAttrib4f(indx: number, x: number, y: number, z: number, w: number): void;
-    vertexAttrib4fv(indx: number, values: Float32Array | number[]): void;
-    vertexAttribPointer(indx: number, size: number, type: number, normalized: boolean, stride: number, offset: number): void;
-    viewport(x: number, y: number, width: number, height: number): void;
-    readonly ACTIVE_ATTRIBUTES: number;
-    readonly ACTIVE_TEXTURE: number;
-    readonly ACTIVE_UNIFORMS: number;
-    readonly ALIASED_LINE_WIDTH_RANGE: number;
-    readonly ALIASED_POINT_SIZE_RANGE: number;
-    readonly ALPHA: number;
-    readonly ALPHA_BITS: number;
-    readonly ALWAYS: number;
-    readonly ARRAY_BUFFER: number;
-    readonly ARRAY_BUFFER_BINDING: number;
-    readonly ATTACHED_SHADERS: number;
-    readonly BACK: number;
-    readonly BLEND: number;
-    readonly BLEND_COLOR: number;
-    readonly BLEND_DST_ALPHA: number;
-    readonly BLEND_DST_RGB: number;
-    readonly BLEND_EQUATION: number;
-    readonly BLEND_EQUATION_ALPHA: number;
-    readonly BLEND_EQUATION_RGB: number;
-    readonly BLEND_SRC_ALPHA: number;
-    readonly BLEND_SRC_RGB: number;
-    readonly BLUE_BITS: number;
-    readonly BOOL: number;
-    readonly BOOL_VEC2: number;
-    readonly BOOL_VEC3: number;
-    readonly BOOL_VEC4: number;
-    readonly BROWSER_DEFAULT_WEBGL: number;
-    readonly BUFFER_SIZE: number;
-    readonly BUFFER_USAGE: number;
-    readonly BYTE: number;
-    readonly CCW: number;
-    readonly CLAMP_TO_EDGE: number;
-    readonly COLOR_ATTACHMENT0: number;
-    readonly COLOR_BUFFER_BIT: number;
-    readonly COLOR_CLEAR_VALUE: number;
-    readonly COLOR_WRITEMASK: number;
-    readonly COMPILE_STATUS: number;
-    readonly COMPRESSED_TEXTURE_FORMATS: number;
-    readonly CONSTANT_ALPHA: number;
-    readonly CONSTANT_COLOR: number;
-    readonly CONTEXT_LOST_WEBGL: number;
-    readonly CULL_FACE: number;
-    readonly CULL_FACE_MODE: number;
-    readonly CURRENT_PROGRAM: number;
-    readonly CURRENT_VERTEX_ATTRIB: number;
-    readonly CW: number;
-    readonly DECR: number;
-    readonly DECR_WRAP: number;
-    readonly DELETE_STATUS: number;
-    readonly DEPTH_ATTACHMENT: number;
-    readonly DEPTH_BITS: number;
-    readonly DEPTH_BUFFER_BIT: number;
-    readonly DEPTH_CLEAR_VALUE: number;
-    readonly DEPTH_COMPONENT: number;
-    readonly DEPTH_COMPONENT16: number;
-    readonly DEPTH_FUNC: number;
-    readonly DEPTH_RANGE: number;
-    readonly DEPTH_STENCIL: number;
-    readonly DEPTH_STENCIL_ATTACHMENT: number;
-    readonly DEPTH_TEST: number;
-    readonly DEPTH_WRITEMASK: number;
-    readonly DITHER: number;
-    readonly DONT_CARE: number;
-    readonly DST_ALPHA: number;
-    readonly DST_COLOR: number;
-    readonly DYNAMIC_DRAW: number;
-    readonly ELEMENT_ARRAY_BUFFER: number;
-    readonly ELEMENT_ARRAY_BUFFER_BINDING: number;
-    readonly EQUAL: number;
-    readonly FASTEST: number;
-    readonly FLOAT: number;
-    readonly FLOAT_MAT2: number;
-    readonly FLOAT_MAT3: number;
-    readonly FLOAT_MAT4: number;
-    readonly FLOAT_VEC2: number;
-    readonly FLOAT_VEC3: number;
-    readonly FLOAT_VEC4: number;
-    readonly FRAGMENT_SHADER: number;
-    readonly FRAMEBUFFER: number;
-    readonly FRAMEBUFFER_ATTACHMENT_OBJECT_NAME: number;
-    readonly FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE: number;
-    readonly FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACE: number;
-    readonly FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL: number;
-    readonly FRAMEBUFFER_BINDING: number;
-    readonly FRAMEBUFFER_COMPLETE: number;
-    readonly FRAMEBUFFER_INCOMPLETE_ATTACHMENT: number;
-    readonly FRAMEBUFFER_INCOMPLETE_DIMENSIONS: number;
-    readonly FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT: number;
-    readonly FRAMEBUFFER_UNSUPPORTED: number;
-    readonly FRONT: number;
-    readonly FRONT_AND_BACK: number;
-    readonly FRONT_FACE: number;
-    readonly FUNC_ADD: number;
-    readonly FUNC_REVERSE_SUBTRACT: number;
-    readonly FUNC_SUBTRACT: number;
-    readonly GENERATE_MIPMAP_HINT: number;
-    readonly GEQUAL: number;
-    readonly GREATER: number;
-    readonly GREEN_BITS: number;
-    readonly HIGH_FLOAT: number;
-    readonly HIGH_INT: number;
-    readonly IMPLEMENTATION_COLOR_READ_FORMAT: number;
-    readonly IMPLEMENTATION_COLOR_READ_TYPE: number;
-    readonly INCR: number;
-    readonly INCR_WRAP: number;
-    readonly INT: number;
-    readonly INT_VEC2: number;
-    readonly INT_VEC3: number;
-    readonly INT_VEC4: number;
-    readonly INVALID_ENUM: number;
-    readonly INVALID_FRAMEBUFFER_OPERATION: number;
-    readonly INVALID_OPERATION: number;
-    readonly INVALID_VALUE: number;
-    readonly INVERT: number;
-    readonly KEEP: number;
-    readonly LEQUAL: number;
-    readonly LESS: number;
-    readonly LINEAR: number;
-    readonly LINEAR_MIPMAP_LINEAR: number;
-    readonly LINEAR_MIPMAP_NEAREST: number;
-    readonly LINES: number;
-    readonly LINE_LOOP: number;
-    readonly LINE_STRIP: number;
-    readonly LINE_WIDTH: number;
-    readonly LINK_STATUS: number;
-    readonly LOW_FLOAT: number;
-    readonly LOW_INT: number;
-    readonly LUMINANCE: number;
-    readonly LUMINANCE_ALPHA: number;
-    readonly MAX_COMBINED_TEXTURE_IMAGE_UNITS: number;
-    readonly MAX_CUBE_MAP_TEXTURE_SIZE: number;
-    readonly MAX_FRAGMENT_UNIFORM_VECTORS: number;
-    readonly MAX_RENDERBUFFER_SIZE: number;
-    readonly MAX_TEXTURE_IMAGE_UNITS: number;
-    readonly MAX_TEXTURE_SIZE: number;
-    readonly MAX_VARYING_VECTORS: number;
-    readonly MAX_VERTEX_ATTRIBS: number;
-    readonly MAX_VERTEX_TEXTURE_IMAGE_UNITS: number;
-    readonly MAX_VERTEX_UNIFORM_VECTORS: number;
-    readonly MAX_VIEWPORT_DIMS: number;
-    readonly MEDIUM_FLOAT: number;
-    readonly MEDIUM_INT: number;
-    readonly MIRRORED_REPEAT: number;
-    readonly NEAREST: number;
-    readonly NEAREST_MIPMAP_LINEAR: number;
-    readonly NEAREST_MIPMAP_NEAREST: number;
-    readonly NEVER: number;
-    readonly NICEST: number;
-    readonly NONE: number;
-    readonly NOTEQUAL: number;
-    readonly NO_ERROR: number;
-    readonly ONE: number;
-    readonly ONE_MINUS_CONSTANT_ALPHA: number;
-    readonly ONE_MINUS_CONSTANT_COLOR: number;
-    readonly ONE_MINUS_DST_ALPHA: number;
-    readonly ONE_MINUS_DST_COLOR: number;
-    readonly ONE_MINUS_SRC_ALPHA: number;
-    readonly ONE_MINUS_SRC_COLOR: number;
-    readonly OUT_OF_MEMORY: number;
-    readonly PACK_ALIGNMENT: number;
-    readonly POINTS: number;
-    readonly POLYGON_OFFSET_FACTOR: number;
-    readonly POLYGON_OFFSET_FILL: number;
-    readonly POLYGON_OFFSET_UNITS: number;
-    readonly RED_BITS: number;
-    readonly RENDERBUFFER: number;
-    readonly RENDERBUFFER_ALPHA_SIZE: number;
-    readonly RENDERBUFFER_BINDING: number;
-    readonly RENDERBUFFER_BLUE_SIZE: number;
-    readonly RENDERBUFFER_DEPTH_SIZE: number;
-    readonly RENDERBUFFER_GREEN_SIZE: number;
-    readonly RENDERBUFFER_HEIGHT: number;
-    readonly RENDERBUFFER_INTERNAL_FORMAT: number;
-    readonly RENDERBUFFER_RED_SIZE: number;
-    readonly RENDERBUFFER_STENCIL_SIZE: number;
-    readonly RENDERBUFFER_WIDTH: number;
-    readonly RENDERER: number;
-    readonly REPEAT: number;
-    readonly REPLACE: number;
-    readonly RGB: number;
-    readonly RGB565: number;
-    readonly RGB5_A1: number;
-    readonly RGBA: number;
-    readonly RGBA4: number;
-    readonly SAMPLER_2D: number;
-    readonly SAMPLER_CUBE: number;
-    readonly SAMPLES: number;
-    readonly SAMPLE_ALPHA_TO_COVERAGE: number;
-    readonly SAMPLE_BUFFERS: number;
-    readonly SAMPLE_COVERAGE: number;
-    readonly SAMPLE_COVERAGE_INVERT: number;
-    readonly SAMPLE_COVERAGE_VALUE: number;
-    readonly SCISSOR_BOX: number;
-    readonly SCISSOR_TEST: number;
-    readonly SHADER_TYPE: number;
-    readonly SHADING_LANGUAGE_VERSION: number;
-    readonly SHORT: number;
-    readonly SRC_ALPHA: number;
-    readonly SRC_ALPHA_SATURATE: number;
-    readonly SRC_COLOR: number;
-    readonly STATIC_DRAW: number;
-    readonly STENCIL_ATTACHMENT: number;
-    readonly STENCIL_BACK_FAIL: number;
-    readonly STENCIL_BACK_FUNC: number;
-    readonly STENCIL_BACK_PASS_DEPTH_FAIL: number;
-    readonly STENCIL_BACK_PASS_DEPTH_PASS: number;
-    readonly STENCIL_BACK_REF: number;
-    readonly STENCIL_BACK_VALUE_MASK: number;
-    readonly STENCIL_BACK_WRITEMASK: number;
-    readonly STENCIL_BITS: number;
-    readonly STENCIL_BUFFER_BIT: number;
-    readonly STENCIL_CLEAR_VALUE: number;
-    readonly STENCIL_FAIL: number;
-    readonly STENCIL_FUNC: number;
-    readonly STENCIL_INDEX: number;
-    readonly STENCIL_INDEX8: number;
-    readonly STENCIL_PASS_DEPTH_FAIL: number;
-    readonly STENCIL_PASS_DEPTH_PASS: number;
-    readonly STENCIL_REF: number;
-    readonly STENCIL_TEST: number;
-    readonly STENCIL_VALUE_MASK: number;
-    readonly STENCIL_WRITEMASK: number;
-    readonly STREAM_DRAW: number;
-    readonly SUBPIXEL_BITS: number;
-    readonly TEXTURE: number;
-    readonly TEXTURE0: number;
-    readonly TEXTURE1: number;
-    readonly TEXTURE10: number;
-    readonly TEXTURE11: number;
-    readonly TEXTURE12: number;
-    readonly TEXTURE13: number;
-    readonly TEXTURE14: number;
-    readonly TEXTURE15: number;
-    readonly TEXTURE16: number;
-    readonly TEXTURE17: number;
-    readonly TEXTURE18: number;
-    readonly TEXTURE19: number;
-    readonly TEXTURE2: number;
-    readonly TEXTURE20: number;
-    readonly TEXTURE21: number;
-    readonly TEXTURE22: number;
-    readonly TEXTURE23: number;
-    readonly TEXTURE24: number;
-    readonly TEXTURE25: number;
-    readonly TEXTURE26: number;
-    readonly TEXTURE27: number;
-    readonly TEXTURE28: number;
-    readonly TEXTURE29: number;
-    readonly TEXTURE3: number;
-    readonly TEXTURE30: number;
-    readonly TEXTURE31: number;
-    readonly TEXTURE4: number;
-    readonly TEXTURE5: number;
-    readonly TEXTURE6: number;
-    readonly TEXTURE7: number;
-    readonly TEXTURE8: number;
-    readonly TEXTURE9: number;
-    readonly TEXTURE_2D: number;
-    readonly TEXTURE_BINDING_2D: number;
-    readonly TEXTURE_BINDING_CUBE_MAP: number;
-    readonly TEXTURE_CUBE_MAP: number;
-    readonly TEXTURE_CUBE_MAP_NEGATIVE_X: number;
-    readonly TEXTURE_CUBE_MAP_NEGATIVE_Y: number;
-    readonly TEXTURE_CUBE_MAP_NEGATIVE_Z: number;
-    readonly TEXTURE_CUBE_MAP_POSITIVE_X: number;
-    readonly TEXTURE_CUBE_MAP_POSITIVE_Y: number;
-    readonly TEXTURE_CUBE_MAP_POSITIVE_Z: number;
-    readonly TEXTURE_MAG_FILTER: number;
-    readonly TEXTURE_MIN_FILTER: number;
-    readonly TEXTURE_WRAP_S: number;
-    readonly TEXTURE_WRAP_T: number;
-    readonly TRIANGLES: number;
-    readonly TRIANGLE_FAN: number;
-    readonly TRIANGLE_STRIP: number;
-    readonly UNPACK_ALIGNMENT: number;
-    readonly UNPACK_COLORSPACE_CONVERSION_WEBGL: number;
-    readonly UNPACK_FLIP_Y_WEBGL: number;
-    readonly UNPACK_PREMULTIPLY_ALPHA_WEBGL: number;
-    readonly UNSIGNED_BYTE: number;
-    readonly UNSIGNED_INT: number;
-    readonly UNSIGNED_SHORT: number;
-    readonly UNSIGNED_SHORT_4_4_4_4: number;
-    readonly UNSIGNED_SHORT_5_5_5_1: number;
-    readonly UNSIGNED_SHORT_5_6_5: number;
-    readonly VALIDATE_STATUS: number;
-    readonly VENDOR: number;
-    readonly VERSION: number;
-    readonly VERTEX_ATTRIB_ARRAY_BUFFER_BINDING: number;
-    readonly VERTEX_ATTRIB_ARRAY_ENABLED: number;
-    readonly VERTEX_ATTRIB_ARRAY_NORMALIZED: number;
-    readonly VERTEX_ATTRIB_ARRAY_POINTER: number;
-    readonly VERTEX_ATTRIB_ARRAY_SIZE: number;
-    readonly VERTEX_ATTRIB_ARRAY_STRIDE: number;
-    readonly VERTEX_ATTRIB_ARRAY_TYPE: number;
-    readonly VERTEX_SHADER: number;
-    readonly VIEWPORT: number;
-    readonly ZERO: number;
-}
-
-declare var WebGLRenderingContext: {
-    prototype: WebGLRenderingContext;
-    new(): WebGLRenderingContext;
-    readonly ACTIVE_ATTRIBUTES: number;
-    readonly ACTIVE_TEXTURE: number;
-    readonly ACTIVE_UNIFORMS: number;
-    readonly ALIASED_LINE_WIDTH_RANGE: number;
-    readonly ALIASED_POINT_SIZE_RANGE: number;
-    readonly ALPHA: number;
-    readonly ALPHA_BITS: number;
-    readonly ALWAYS: number;
-    readonly ARRAY_BUFFER: number;
-    readonly ARRAY_BUFFER_BINDING: number;
-    readonly ATTACHED_SHADERS: number;
-    readonly BACK: number;
-    readonly BLEND: number;
-    readonly BLEND_COLOR: number;
-    readonly BLEND_DST_ALPHA: number;
-    readonly BLEND_DST_RGB: number;
-    readonly BLEND_EQUATION: number;
-    readonly BLEND_EQUATION_ALPHA: number;
-    readonly BLEND_EQUATION_RGB: number;
-    readonly BLEND_SRC_ALPHA: number;
-    readonly BLEND_SRC_RGB: number;
-    readonly BLUE_BITS: number;
-    readonly BOOL: number;
-    readonly BOOL_VEC2: number;
-    readonly BOOL_VEC3: number;
-    readonly BOOL_VEC4: number;
-    readonly BROWSER_DEFAULT_WEBGL: number;
-    readonly BUFFER_SIZE: number;
-    readonly BUFFER_USAGE: number;
-    readonly BYTE: number;
-    readonly CCW: number;
-    readonly CLAMP_TO_EDGE: number;
-    readonly COLOR_ATTACHMENT0: number;
-    readonly COLOR_BUFFER_BIT: number;
-    readonly COLOR_CLEAR_VALUE: number;
-    readonly COLOR_WRITEMASK: number;
-    readonly COMPILE_STATUS: number;
-    readonly COMPRESSED_TEXTURE_FORMATS: number;
-    readonly CONSTANT_ALPHA: number;
-    readonly CONSTANT_COLOR: number;
-    readonly CONTEXT_LOST_WEBGL: number;
-    readonly CULL_FACE: number;
-    readonly CULL_FACE_MODE: number;
-    readonly CURRENT_PROGRAM: number;
-    readonly CURRENT_VERTEX_ATTRIB: number;
-    readonly CW: number;
-    readonly DECR: number;
-    readonly DECR_WRAP: number;
-    readonly DELETE_STATUS: number;
-    readonly DEPTH_ATTACHMENT: number;
-    readonly DEPTH_BITS: number;
-    readonly DEPTH_BUFFER_BIT: number;
-    readonly DEPTH_CLEAR_VALUE: number;
-    readonly DEPTH_COMPONENT: number;
-    readonly DEPTH_COMPONENT16: number;
-    readonly DEPTH_FUNC: number;
-    readonly DEPTH_RANGE: number;
-    readonly DEPTH_STENCIL: number;
-    readonly DEPTH_STENCIL_ATTACHMENT: number;
-    readonly DEPTH_TEST: number;
-    readonly DEPTH_WRITEMASK: number;
-    readonly DITHER: number;
-    readonly DONT_CARE: number;
-    readonly DST_ALPHA: number;
-    readonly DST_COLOR: number;
-    readonly DYNAMIC_DRAW: number;
-    readonly ELEMENT_ARRAY_BUFFER: number;
-    readonly ELEMENT_ARRAY_BUFFER_BINDING: number;
-    readonly EQUAL: number;
-    readonly FASTEST: number;
-    readonly FLOAT: number;
-    readonly FLOAT_MAT2: number;
-    readonly FLOAT_MAT3: number;
-    readonly FLOAT_MAT4: number;
-    readonly FLOAT_VEC2: number;
-    readonly FLOAT_VEC3: number;
-    readonly FLOAT_VEC4: number;
-    readonly FRAGMENT_SHADER: number;
-    readonly FRAMEBUFFER: number;
-    readonly FRAMEBUFFER_ATTACHMENT_OBJECT_NAME: number;
-    readonly FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE: number;
-    readonly FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACE: number;
-    readonly FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL: number;
-    readonly FRAMEBUFFER_BINDING: number;
-    readonly FRAMEBUFFER_COMPLETE: number;
-    readonly FRAMEBUFFER_INCOMPLETE_ATTACHMENT: number;
-    readonly FRAMEBUFFER_INCOMPLETE_DIMENSIONS: number;
-    readonly FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT: number;
-    readonly FRAMEBUFFER_UNSUPPORTED: number;
-    readonly FRONT: number;
-    readonly FRONT_AND_BACK: number;
-    readonly FRONT_FACE: number;
-    readonly FUNC_ADD: number;
-    readonly FUNC_REVERSE_SUBTRACT: number;
-    readonly FUNC_SUBTRACT: number;
-    readonly GENERATE_MIPMAP_HINT: number;
-    readonly GEQUAL: number;
-    readonly GREATER: number;
-    readonly GREEN_BITS: number;
-    readonly HIGH_FLOAT: number;
-    readonly HIGH_INT: number;
-    readonly IMPLEMENTATION_COLOR_READ_FORMAT: number;
-    readonly IMPLEMENTATION_COLOR_READ_TYPE: number;
-    readonly INCR: number;
-    readonly INCR_WRAP: number;
-    readonly INT: number;
-    readonly INT_VEC2: number;
-    readonly INT_VEC3: number;
-    readonly INT_VEC4: number;
-    readonly INVALID_ENUM: number;
-    readonly INVALID_FRAMEBUFFER_OPERATION: number;
-    readonly INVALID_OPERATION: number;
-    readonly INVALID_VALUE: number;
-    readonly INVERT: number;
-    readonly KEEP: number;
-    readonly LEQUAL: number;
-    readonly LESS: number;
-    readonly LINEAR: number;
-    readonly LINEAR_MIPMAP_LINEAR: number;
-    readonly LINEAR_MIPMAP_NEAREST: number;
-    readonly LINES: number;
-    readonly LINE_LOOP: number;
-    readonly LINE_STRIP: number;
-    readonly LINE_WIDTH: number;
-    readonly LINK_STATUS: number;
-    readonly LOW_FLOAT: number;
-    readonly LOW_INT: number;
-    readonly LUMINANCE: number;
-    readonly LUMINANCE_ALPHA: number;
-    readonly MAX_COMBINED_TEXTURE_IMAGE_UNITS: number;
-    readonly MAX_CUBE_MAP_TEXTURE_SIZE: number;
-    readonly MAX_FRAGMENT_UNIFORM_VECTORS: number;
-    readonly MAX_RENDERBUFFER_SIZE: number;
-    readonly MAX_TEXTURE_IMAGE_UNITS: number;
-    readonly MAX_TEXTURE_SIZE: number;
-    readonly MAX_VARYING_VECTORS: number;
-    readonly MAX_VERTEX_ATTRIBS: number;
-    readonly MAX_VERTEX_TEXTURE_IMAGE_UNITS: number;
-    readonly MAX_VERTEX_UNIFORM_VECTORS: number;
-    readonly MAX_VIEWPORT_DIMS: number;
-    readonly MEDIUM_FLOAT: number;
-    readonly MEDIUM_INT: number;
-    readonly MIRRORED_REPEAT: number;
-    readonly NEAREST: number;
-    readonly NEAREST_MIPMAP_LINEAR: number;
-    readonly NEAREST_MIPMAP_NEAREST: number;
-    readonly NEVER: number;
-    readonly NICEST: number;
-    readonly NONE: number;
-    readonly NOTEQUAL: number;
-    readonly NO_ERROR: number;
-    readonly ONE: number;
-    readonly ONE_MINUS_CONSTANT_ALPHA: number;
-    readonly ONE_MINUS_CONSTANT_COLOR: number;
-    readonly ONE_MINUS_DST_ALPHA: number;
-    readonly ONE_MINUS_DST_COLOR: number;
-    readonly ONE_MINUS_SRC_ALPHA: number;
-    readonly ONE_MINUS_SRC_COLOR: number;
-    readonly OUT_OF_MEMORY: number;
-    readonly PACK_ALIGNMENT: number;
-    readonly POINTS: number;
-    readonly POLYGON_OFFSET_FACTOR: number;
-    readonly POLYGON_OFFSET_FILL: number;
-    readonly POLYGON_OFFSET_UNITS: number;
-    readonly RED_BITS: number;
-    readonly RENDERBUFFER: number;
-    readonly RENDERBUFFER_ALPHA_SIZE: number;
-    readonly RENDERBUFFER_BINDING: number;
-    readonly RENDERBUFFER_BLUE_SIZE: number;
-    readonly RENDERBUFFER_DEPTH_SIZE: number;
-    readonly RENDERBUFFER_GREEN_SIZE: number;
-    readonly RENDERBUFFER_HEIGHT: number;
-    readonly RENDERBUFFER_INTERNAL_FORMAT: number;
-    readonly RENDERBUFFER_RED_SIZE: number;
-    readonly RENDERBUFFER_STENCIL_SIZE: number;
-    readonly RENDERBUFFER_WIDTH: number;
-    readonly RENDERER: number;
-    readonly REPEAT: number;
-    readonly REPLACE: number;
-    readonly RGB: number;
-    readonly RGB565: number;
-    readonly RGB5_A1: number;
-    readonly RGBA: number;
-    readonly RGBA4: number;
-    readonly SAMPLER_2D: number;
-    readonly SAMPLER_CUBE: number;
-    readonly SAMPLES: number;
-    readonly SAMPLE_ALPHA_TO_COVERAGE: number;
-    readonly SAMPLE_BUFFERS: number;
-    readonly SAMPLE_COVERAGE: number;
-    readonly SAMPLE_COVERAGE_INVERT: number;
-    readonly SAMPLE_COVERAGE_VALUE: number;
-    readonly SCISSOR_BOX: number;
-    readonly SCISSOR_TEST: number;
-    readonly SHADER_TYPE: number;
-    readonly SHADING_LANGUAGE_VERSION: number;
-    readonly SHORT: number;
-    readonly SRC_ALPHA: number;
-    readonly SRC_ALPHA_SATURATE: number;
-    readonly SRC_COLOR: number;
-    readonly STATIC_DRAW: number;
-    readonly STENCIL_ATTACHMENT: number;
-    readonly STENCIL_BACK_FAIL: number;
-    readonly STENCIL_BACK_FUNC: number;
-    readonly STENCIL_BACK_PASS_DEPTH_FAIL: number;
-    readonly STENCIL_BACK_PASS_DEPTH_PASS: number;
-    readonly STENCIL_BACK_REF: number;
-    readonly STENCIL_BACK_VALUE_MASK: number;
-    readonly STENCIL_BACK_WRITEMASK: number;
-    readonly STENCIL_BITS: number;
-    readonly STENCIL_BUFFER_BIT: number;
-    readonly STENCIL_CLEAR_VALUE: number;
-    readonly STENCIL_FAIL: number;
-    readonly STENCIL_FUNC: number;
-    readonly STENCIL_INDEX: number;
-    readonly STENCIL_INDEX8: number;
-    readonly STENCIL_PASS_DEPTH_FAIL: number;
-    readonly STENCIL_PASS_DEPTH_PASS: number;
-    readonly STENCIL_REF: number;
-    readonly STENCIL_TEST: number;
-    readonly STENCIL_VALUE_MASK: number;
-    readonly STENCIL_WRITEMASK: number;
-    readonly STREAM_DRAW: number;
-    readonly SUBPIXEL_BITS: number;
-    readonly TEXTURE: number;
-    readonly TEXTURE0: number;
-    readonly TEXTURE1: number;
-    readonly TEXTURE10: number;
-    readonly TEXTURE11: number;
-    readonly TEXTURE12: number;
-    readonly TEXTURE13: number;
-    readonly TEXTURE14: number;
-    readonly TEXTURE15: number;
-    readonly TEXTURE16: number;
-    readonly TEXTURE17: number;
-    readonly TEXTURE18: number;
-    readonly TEXTURE19: number;
-    readonly TEXTURE2: number;
-    readonly TEXTURE20: number;
-    readonly TEXTURE21: number;
-    readonly TEXTURE22: number;
-    readonly TEXTURE23: number;
-    readonly TEXTURE24: number;
-    readonly TEXTURE25: number;
-    readonly TEXTURE26: number;
-    readonly TEXTURE27: number;
-    readonly TEXTURE28: number;
-    readonly TEXTURE29: number;
-    readonly TEXTURE3: number;
-    readonly TEXTURE30: number;
-    readonly TEXTURE31: number;
-    readonly TEXTURE4: number;
-    readonly TEXTURE5: number;
-    readonly TEXTURE6: number;
-    readonly TEXTURE7: number;
-    readonly TEXTURE8: number;
-    readonly TEXTURE9: number;
-    readonly TEXTURE_2D: number;
-    readonly TEXTURE_BINDING_2D: number;
-    readonly TEXTURE_BINDING_CUBE_MAP: number;
-    readonly TEXTURE_CUBE_MAP: number;
-    readonly TEXTURE_CUBE_MAP_NEGATIVE_X: number;
-    readonly TEXTURE_CUBE_MAP_NEGATIVE_Y: number;
-    readonly TEXTURE_CUBE_MAP_NEGATIVE_Z: number;
-    readonly TEXTURE_CUBE_MAP_POSITIVE_X: number;
-    readonly TEXTURE_CUBE_MAP_POSITIVE_Y: number;
-    readonly TEXTURE_CUBE_MAP_POSITIVE_Z: number;
-    readonly TEXTURE_MAG_FILTER: number;
-    readonly TEXTURE_MIN_FILTER: number;
-    readonly TEXTURE_WRAP_S: number;
-    readonly TEXTURE_WRAP_T: number;
-    readonly TRIANGLES: number;
-    readonly TRIANGLE_FAN: number;
-    readonly TRIANGLE_STRIP: number;
-    readonly UNPACK_ALIGNMENT: number;
-    readonly UNPACK_COLORSPACE_CONVERSION_WEBGL: number;
-    readonly UNPACK_FLIP_Y_WEBGL: number;
-    readonly UNPACK_PREMULTIPLY_ALPHA_WEBGL: number;
-    readonly UNSIGNED_BYTE: number;
-    readonly UNSIGNED_INT: number;
-    readonly UNSIGNED_SHORT: number;
-    readonly UNSIGNED_SHORT_4_4_4_4: number;
-    readonly UNSIGNED_SHORT_5_5_5_1: number;
-    readonly UNSIGNED_SHORT_5_6_5: number;
-    readonly VALIDATE_STATUS: number;
-    readonly VENDOR: number;
-    readonly VERSION: number;
-    readonly VERTEX_ATTRIB_ARRAY_BUFFER_BINDING: number;
-    readonly VERTEX_ATTRIB_ARRAY_ENABLED: number;
-    readonly VERTEX_ATTRIB_ARRAY_NORMALIZED: number;
-    readonly VERTEX_ATTRIB_ARRAY_POINTER: number;
-    readonly VERTEX_ATTRIB_ARRAY_SIZE: number;
-    readonly VERTEX_ATTRIB_ARRAY_STRIDE: number;
-    readonly VERTEX_ATTRIB_ARRAY_TYPE: number;
-    readonly VERTEX_SHADER: number;
-    readonly VIEWPORT: number;
-    readonly ZERO: number;
-};
-
-interface WebGLShader extends WebGLObject {
-}
-
-declare var WebGLShader: {
-    prototype: WebGLShader;
-    new(): WebGLShader;
-};
-
-interface WebGLShaderPrecisionFormat {
-    readonly precision: number;
-    readonly rangeMax: number;
-    readonly rangeMin: number;
-}
-
-declare var WebGLShaderPrecisionFormat: {
-    prototype: WebGLShaderPrecisionFormat;
-    new(): WebGLShaderPrecisionFormat;
-};
-
-interface WebGLTexture extends WebGLObject {
-}
-
-declare var WebGLTexture: {
-    prototype: WebGLTexture;
-    new(): WebGLTexture;
-};
-
-interface WebGLUniformLocation {
-}
-
-declare var WebGLUniformLocation: {
-    prototype: WebGLUniformLocation;
-    new(): WebGLUniformLocation;
-};
-
-interface WebGLVertexArrayObjectOES {
-}
-
-interface WebKitCSSMatrix {
-    a: number;
-    b: number;
-    c: number;
-    d: number;
-    e: number;
-    f: number;
-    m11: number;
-    m12: number;
-    m13: number;
-    m14: number;
-    m21: number;
-    m22: number;
-    m23: number;
-    m24: number;
-    m31: number;
-    m32: number;
-    m33: number;
-    m34: number;
-    m41: number;
-    m42: number;
-    m43: number;
-    m44: number;
-    inverse(): WebKitCSSMatrix;
-    multiply(secondMatrix: WebKitCSSMatrix): WebKitCSSMatrix;
-    rotate(angleX: number, angleY?: number, angleZ?: number): WebKitCSSMatrix;
-    rotateAxisAngle(x: number, y: number, z: number, angle: number): WebKitCSSMatrix;
-    scale(scaleX: number, scaleY?: number, scaleZ?: number): WebKitCSSMatrix;
-    setMatrixValue(value: string): void;
-    skewX(angle: number): WebKitCSSMatrix;
-    skewY(angle: number): WebKitCSSMatrix;
-    toString(): string;
-    translate(x: number, y: number, z?: number): WebKitCSSMatrix;
-}
-
-declare var WebKitCSSMatrix: {
-    prototype: WebKitCSSMatrix;
-    new(text?: string): WebKitCSSMatrix;
-};
-
-interface WebKitDirectoryEntry extends WebKitEntry {
-    createReader(): WebKitDirectoryReader;
-}
-
-declare var WebKitDirectoryEntry: {
-    prototype: WebKitDirectoryEntry;
-    new(): WebKitDirectoryEntry;
-};
-
-interface WebKitDirectoryReader {
-    readEntries(successCallback: WebKitEntriesCallback, errorCallback?: WebKitErrorCallback): void;
-}
-
-declare var WebKitDirectoryReader: {
-    prototype: WebKitDirectoryReader;
-    new(): WebKitDirectoryReader;
-};
-
-interface WebKitEntry {
-    readonly filesystem: WebKitFileSystem;
-    readonly fullPath: string;
-    readonly isDirectory: boolean;
-    readonly isFile: boolean;
-    readonly name: string;
-}
-
-declare var WebKitEntry: {
-    prototype: WebKitEntry;
-    new(): WebKitEntry;
-};
-
-interface WebKitFileEntry extends WebKitEntry {
-    file(successCallback: WebKitFileCallback, errorCallback?: WebKitErrorCallback): void;
-}
-
-declare var WebKitFileEntry: {
-    prototype: WebKitFileEntry;
-    new(): WebKitFileEntry;
-};
-
-interface WebKitFileSystem {
-    readonly name: string;
-    readonly root: WebKitDirectoryEntry;
-}
-
-declare var WebKitFileSystem: {
-    prototype: WebKitFileSystem;
-    new(): WebKitFileSystem;
-};
-
-interface WebKitPoint {
-    x: number;
-    y: number;
-}
-
-declare var WebKitPoint: {
-    prototype: WebKitPoint;
-    new(x?: number, y?: number): WebKitPoint;
-};
-
-interface WebSocketEventMap {
-    "close": CloseEvent;
-    "error": Event;
-    "message": MessageEvent;
-    "open": Event;
-}
-
-interface WebSocket extends EventTarget {
-    binaryType: BinaryType;
-    readonly bufferedAmount: number;
-    readonly extensions: string;
-    onclose: ((this: WebSocket, ev: CloseEvent) => any) | null;
-    onerror: ((this: WebSocket, ev: Event) => any) | null;
-    onmessage: ((this: WebSocket, ev: MessageEvent) => any) | null;
-    onopen: ((this: WebSocket, ev: Event) => any) | null;
-    readonly protocol: string;
-    readonly readyState: number;
-    readonly url: string;
-    close(code?: number, reason?: string): void;
-    send(data: string | ArrayBufferLike | Blob | ArrayBufferView): void;
-    readonly CLOSED: number;
-    readonly CLOSING: number;
-    readonly CONNECTING: number;
-    readonly OPEN: number;
-    addEventListener<K extends keyof WebSocketEventMap>(type: K, listener: (this: WebSocket, ev: WebSocketEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof WebSocketEventMap>(type: K, listener: (this: WebSocket, ev: WebSocketEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var WebSocket: {
-    prototype: WebSocket;
-    new(url: string, protocols?: string | string[]): WebSocket;
-    readonly CLOSED: number;
-    readonly CLOSING: number;
-    readonly CONNECTING: number;
-    readonly OPEN: number;
-};
-
-interface WheelEvent extends MouseEvent {
-    readonly deltaMode: number;
-    readonly deltaX: number;
-    readonly deltaY: number;
-    readonly deltaZ: number;
-    readonly wheelDelta: number;
-    readonly wheelDeltaX: number;
-    readonly wheelDeltaY: number;
-    getCurrentPoint(element: Element): void;
-    initWheelEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number, screenXArg: number, screenYArg: number, clientXArg: number, clientYArg: number, buttonArg: number, relatedTargetArg: EventTarget, modifiersListArg: string, deltaXArg: number, deltaYArg: number, deltaZArg: number, deltaMode: number): void;
-    readonly DOM_DELTA_LINE: number;
-    readonly DOM_DELTA_PAGE: number;
-    readonly DOM_DELTA_PIXEL: number;
-}
-
-declare var WheelEvent: {
-    prototype: WheelEvent;
-    new(typeArg: string, eventInitDict?: WheelEventInit): WheelEvent;
-    readonly DOM_DELTA_LINE: number;
-    readonly DOM_DELTA_PAGE: number;
-    readonly DOM_DELTA_PIXEL: number;
-};
-
-interface WindowEventMap extends GlobalEventHandlersEventMap {
-    "abort": UIEvent;
-    "afterprint": Event;
-    "beforeprint": Event;
-    "beforeunload": BeforeUnloadEvent;
-    "blur": FocusEvent;
-    "canplay": Event;
-    "canplaythrough": Event;
-    "change": Event;
-    "click": MouseEvent;
-    "compassneedscalibration": Event;
-    "contextmenu": PointerEvent;
-    "dblclick": MouseEvent;
-    "devicelight": DeviceLightEvent;
-    "devicemotion": DeviceMotionEvent;
-    "deviceorientation": DeviceOrientationEvent;
-    "drag": DragEvent;
-    "dragend": DragEvent;
-    "dragenter": DragEvent;
-    "dragleave": DragEvent;
-    "dragover": DragEvent;
-    "dragstart": DragEvent;
-    "drop": DragEvent;
-    "durationchange": Event;
-    "emptied": Event;
-    "ended": Event;
-    "error": ErrorEvent;
-    "focus": FocusEvent;
-    "hashchange": HashChangeEvent;
-    "input": Event;
-    "invalid": Event;
-    "keydown": KeyboardEvent;
-    "keypress": KeyboardEvent;
-    "keyup": KeyboardEvent;
-    "load": Event;
-    "loadeddata": Event;
-    "loadedmetadata": Event;
-    "loadstart": Event;
-    "message": MessageEvent;
-    "mousedown": MouseEvent;
-    "mouseenter": MouseEvent;
-    "mouseleave": MouseEvent;
-    "mousemove": MouseEvent;
-    "mouseout": MouseEvent;
-    "mouseover": MouseEvent;
-    "mouseup": MouseEvent;
-    "mousewheel": WheelEvent;
-    "MSGestureChange": Event;
-    "MSGestureDoubleTap": Event;
-    "MSGestureEnd": Event;
-    "MSGestureHold": Event;
-    "MSGestureStart": Event;
-    "MSGestureTap": Event;
-    "MSInertiaStart": Event;
-    "MSPointerCancel": Event;
-    "MSPointerDown": Event;
-    "MSPointerEnter": Event;
-    "MSPointerLeave": Event;
-    "MSPointerMove": Event;
-    "MSPointerOut": Event;
-    "MSPointerOver": Event;
-    "MSPointerUp": Event;
-    "offline": Event;
-    "online": Event;
-    "orientationchange": Event;
-    "pagehide": PageTransitionEvent;
-    "pageshow": PageTransitionEvent;
-    "pause": Event;
-    "play": Event;
-    "playing": Event;
-    "popstate": PopStateEvent;
-    "progress": ProgressEvent;
-    "ratechange": Event;
-    "readystatechange": ProgressEvent;
-    "reset": Event;
-    "resize": UIEvent;
-    "scroll": UIEvent;
-    "seeked": Event;
-    "seeking": Event;
-    "select": UIEvent;
-    "stalled": Event;
-    "storage": StorageEvent;
-    "submit": Event;
-    "suspend": Event;
-    "timeupdate": Event;
-    "touchcancel": TouchEvent;
-    "touchend": TouchEvent;
-    "touchmove": TouchEvent;
-    "touchstart": TouchEvent;
-    "unload": Event;
-    "volumechange": Event;
-    "vrdisplayactivate": Event;
-    "vrdisplayblur": Event;
-    "vrdisplayconnect": Event;
-    "vrdisplaydeactivate": Event;
-    "vrdisplaydisconnect": Event;
-    "vrdisplayfocus": Event;
-    "vrdisplaypointerrestricted": Event;
-    "vrdisplaypointerunrestricted": Event;
-    "vrdisplaypresentchange": Event;
-    "waiting": Event;
-}
-
-interface Window extends EventTarget, WindowTimers, WindowSessionStorage, WindowLocalStorage, WindowConsole, GlobalEventHandlers, IDBEnvironment, WindowBase64, GlobalFetch {
-    Blob: typeof Blob;
-    URL: typeof URL;
-    URLSearchParams: typeof URLSearchParams;
-    readonly applicationCache: ApplicationCache;
-    readonly caches: CacheStorage;
-    readonly clientInformation: Navigator;
-    readonly closed: boolean;
-    readonly crypto: Crypto;
-    customElements: CustomElementRegistry;
-    defaultStatus: string;
-    readonly devicePixelRatio: number;
-    readonly doNotTrack: string;
-    readonly document: Document;
-    event: Event | undefined;
-    readonly external: External;
-    readonly frameElement: Element;
-    readonly frames: Window;
-    readonly history: History;
-    readonly innerHeight: number;
-    readonly innerWidth: number;
-    readonly isSecureContext: boolean;
-    readonly length: number;
-    location: Location;
-    readonly locationbar: BarProp;
-    readonly menubar: BarProp;
-    readonly msContentScript: ExtensionScriptApis;
-    readonly msCredentials: MSCredentials;
-    name: string;
-    readonly navigator: Navigator;
-    offscreenBuffering: string | boolean;
-    onabort: ((this: Window, ev: UIEvent) => any) | null;
-    onafterprint: ((this: Window, ev: Event) => any) | null;
-    onbeforeprint: ((this: Window, ev: Event) => any) | null;
-    onbeforeunload: ((this: Window, ev: BeforeUnloadEvent) => any) | null;
-    onblur: ((this: Window, ev: FocusEvent) => any) | null;
-    oncanplay: ((this: Window, ev: Event) => any) | null;
-    oncanplaythrough: ((this: Window, ev: Event) => any) | null;
-    onchange: ((this: Window, ev: Event) => any) | null;
-    onclick: ((this: Window, ev: MouseEvent) => any) | null;
-    oncompassneedscalibration: ((this: Window, ev: Event) => any) | null;
-    oncontextmenu: ((this: Window, ev: PointerEvent) => any) | null;
-    ondblclick: ((this: Window, ev: MouseEvent) => any) | null;
-    ondevicelight: ((this: Window, ev: DeviceLightEvent) => any) | null;
-    ondevicemotion: ((this: Window, ev: DeviceMotionEvent) => any) | null;
-    ondeviceorientation: ((this: Window, ev: DeviceOrientationEvent) => any) | null;
-    ondrag: ((this: Window, ev: DragEvent) => any) | null;
-    ondragend: ((this: Window, ev: DragEvent) => any) | null;
-    ondragenter: ((this: Window, ev: DragEvent) => any) | null;
-    ondragleave: ((this: Window, ev: DragEvent) => any) | null;
-    ondragover: ((this: Window, ev: DragEvent) => any) | null;
-    ondragstart: ((this: Window, ev: DragEvent) => any) | null;
-    ondrop: ((this: Window, ev: DragEvent) => any) | null;
-    ondurationchange: ((this: Window, ev: Event) => any) | null;
-    onemptied: ((this: Window, ev: Event) => any) | null;
-    onended: ((this: Window, ev: Event) => any) | null;
-    onerror: ErrorEventHandler;
-    onfocus: ((this: Window, ev: FocusEvent) => any) | null;
-    onhashchange: ((this: Window, ev: HashChangeEvent) => any) | null;
-    oninput: ((this: Window, ev: Event) => any) | null;
-    oninvalid: ((this: Window, ev: Event) => any) | null;
-    onkeydown: ((this: Window, ev: KeyboardEvent) => any) | null;
-    onkeypress: ((this: Window, ev: KeyboardEvent) => any) | null;
-    onkeyup: ((this: Window, ev: KeyboardEvent) => any) | null;
-    onload: ((this: Window, ev: Event) => any) | null;
-    onloadeddata: ((this: Window, ev: Event) => any) | null;
-    onloadedmetadata: ((this: Window, ev: Event) => any) | null;
-    onloadstart: ((this: Window, ev: Event) => any) | null;
-    onmessage: ((this: Window, ev: MessageEvent) => any) | null;
-    onmousedown: ((this: Window, ev: MouseEvent) => any) | null;
-    onmouseenter: ((this: Window, ev: MouseEvent) => any) | null;
-    onmouseleave: ((this: Window, ev: MouseEvent) => any) | null;
-    onmousemove: ((this: Window, ev: MouseEvent) => any) | null;
-    onmouseout: ((this: Window, ev: MouseEvent) => any) | null;
-    onmouseover: ((this: Window, ev: MouseEvent) => any) | null;
-    onmouseup: ((this: Window, ev: MouseEvent) => any) | null;
-    onmousewheel: ((this: Window, ev: WheelEvent) => any) | null;
-    onmsgesturechange: ((this: Window, ev: Event) => any) | null;
-    onmsgesturedoubletap: ((this: Window, ev: Event) => any) | null;
-    onmsgestureend: ((this: Window, ev: Event) => any) | null;
-    onmsgesturehold: ((this: Window, ev: Event) => any) | null;
-    onmsgesturestart: ((this: Window, ev: Event) => any) | null;
-    onmsgesturetap: ((this: Window, ev: Event) => any) | null;
-    onmsinertiastart: ((this: Window, ev: Event) => any) | null;
-    onmspointercancel: ((this: Window, ev: Event) => any) | null;
-    onmspointerdown: ((this: Window, ev: Event) => any) | null;
-    onmspointerenter: ((this: Window, ev: Event) => any) | null;
-    onmspointerleave: ((this: Window, ev: Event) => any) | null;
-    onmspointermove: ((this: Window, ev: Event) => any) | null;
-    onmspointerout: ((this: Window, ev: Event) => any) | null;
-    onmspointerover: ((this: Window, ev: Event) => any) | null;
-    onmspointerup: ((this: Window, ev: Event) => any) | null;
-    onoffline: ((this: Window, ev: Event) => any) | null;
-    ononline: ((this: Window, ev: Event) => any) | null;
-    onorientationchange: ((this: Window, ev: Event) => any) | null;
-    onpagehide: ((this: Window, ev: PageTransitionEvent) => any) | null;
-    onpageshow: ((this: Window, ev: PageTransitionEvent) => any) | null;
-    onpause: ((this: Window, ev: Event) => any) | null;
-    onplay: ((this: Window, ev: Event) => any) | null;
-    onplaying: ((this: Window, ev: Event) => any) | null;
-    onpopstate: ((this: Window, ev: PopStateEvent) => any) | null;
-    onprogress: ((this: Window, ev: ProgressEvent) => any) | null;
-    onratechange: ((this: Window, ev: Event) => any) | null;
-    onreadystatechange: ((this: Window, ev: ProgressEvent) => any) | null;
-    onreset: ((this: Window, ev: Event) => any) | null;
-    onresize: ((this: Window, ev: UIEvent) => any) | null;
-    onscroll: ((this: Window, ev: UIEvent) => any) | null;
-    onseeked: ((this: Window, ev: Event) => any) | null;
-    onseeking: ((this: Window, ev: Event) => any) | null;
-    onselect: ((this: Window, ev: UIEvent) => any) | null;
-    onstalled: ((this: Window, ev: Event) => any) | null;
-    onstorage: ((this: Window, ev: StorageEvent) => any) | null;
-    onsubmit: ((this: Window, ev: Event) => any) | null;
-    onsuspend: ((this: Window, ev: Event) => any) | null;
-    ontimeupdate: ((this: Window, ev: Event) => any) | null;
-    ontouchcancel: (ev: TouchEvent) => any;
-    ontouchend: (ev: TouchEvent) => any;
-    ontouchmove: (ev: TouchEvent) => any;
-    ontouchstart: (ev: TouchEvent) => any;
-    onunload: ((this: Window, ev: Event) => any) | null;
-    onvolumechange: ((this: Window, ev: Event) => any) | null;
-    onvrdisplayactivate: ((this: Window, ev: Event) => any) | null;
-    onvrdisplayblur: ((this: Window, ev: Event) => any) | null;
-    onvrdisplayconnect: ((this: Window, ev: Event) => any) | null;
-    onvrdisplaydeactivate: ((this: Window, ev: Event) => any) | null;
-    onvrdisplaydisconnect: ((this: Window, ev: Event) => any) | null;
-    onvrdisplayfocus: ((this: Window, ev: Event) => any) | null;
-    onvrdisplaypointerrestricted: ((this: Window, ev: Event) => any) | null;
-    onvrdisplaypointerunrestricted: ((this: Window, ev: Event) => any) | null;
-    onvrdisplaypresentchange: ((this: Window, ev: Event) => any) | null;
-    onwaiting: ((this: Window, ev: Event) => any) | null;
-    opener: any;
-    readonly orientation: string | number;
-    readonly outerHeight: number;
-    readonly outerWidth: number;
-    readonly pageXOffset: number;
-    readonly pageYOffset: number;
-    readonly parent: Window;
-    readonly performance: Performance;
-    readonly personalbar: BarProp;
-    readonly screen: Screen;
-    readonly screenLeft: number;
-    readonly screenTop: number;
-    readonly screenX: number;
-    readonly screenY: number;
-    readonly scrollX: number;
-    readonly scrollY: number;
-    readonly scrollbars: BarProp;
-    readonly self: Window;
-    readonly speechSynthesis: SpeechSynthesis;
-    status: string;
-    readonly statusbar: BarProp;
-    readonly styleMedia: StyleMedia;
-    readonly toolbar: BarProp;
-    readonly top: Window;
-    readonly window: Window;
-    alert(message?: any): void;
-    blur(): void;
-    cancelAnimationFrame(handle: number): void;
-    captureEvents(): void;
-    close(): void;
-    confirm(message?: string): boolean;
-    createImageBitmap(image: HTMLImageElement | SVGImageElement | HTMLVideoElement | HTMLCanvasElement | ImageBitmap | ImageData | Blob, options?: ImageBitmapOptions): Promise<ImageBitmap>;
-    createImageBitmap(image: HTMLImageElement | SVGImageElement | HTMLVideoElement | HTMLCanvasElement | ImageBitmap | ImageData | Blob, sx: number, sy: number, sw: number, sh: number, options?: ImageBitmapOptions): Promise<ImageBitmap>;
-    departFocus(navigationReason: NavigationReason, origin: FocusNavigationOrigin): void;
-    focus(): void;
-    getComputedStyle(elt: Element, pseudoElt?: string | null): CSSStyleDeclaration;
-    getMatchedCSSRules(elt: Element, pseudoElt?: string | null): CSSRuleList;
-    getSelection(): Selection;
-    matchMedia(mediaQuery: string): MediaQueryList;
-    moveBy(x?: number, y?: number): void;
-    moveTo(x?: number, y?: number): void;
-    msWriteProfilerMark(profilerMarkName: string): void;
-    open(url?: string, target?: string, features?: string, replace?: boolean): Window | null;
-    postMessage(message: any, targetOrigin: string, transfer?: any[]): void;
-    print(): void;
-    prompt(message?: string, _default?: string): string | null;
-    releaseEvents(): void;
-    requestAnimationFrame(callback: FrameRequestCallback): number;
-    resizeBy(x?: number, y?: number): void;
-    resizeTo(x?: number, y?: number): void;
-    scroll(options?: ScrollToOptions): void;
-    scroll(x?: number, y?: number): void;
-    scrollBy(options?: ScrollToOptions): void;
-    scrollBy(x?: number, y?: number): void;
-    scrollTo(options?: ScrollToOptions): void;
-    scrollTo(x?: number, y?: number): void;
-    stop(): void;
-    webkitCancelAnimationFrame(handle: number): void;
-    webkitConvertPointFromNodeToPage(node: Node, pt: WebKitPoint): WebKitPoint;
-    webkitConvertPointFromPageToNode(node: Node, pt: WebKitPoint): WebKitPoint;
-    webkitRequestAnimationFrame(callback: FrameRequestCallback): number;
-    addEventListener<K extends keyof WindowEventMap>(type: K, listener: (this: Window, ev: WindowEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof WindowEventMap>(type: K, listener: (this: Window, ev: WindowEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var Window: {
-    prototype: Window;
-    new(): Window;
-};
-
-interface WindowBase64 {
-    atob(encodedString: string): string;
-    btoa(rawString: string): string;
-}
-
-interface WindowConsole {
-    readonly console: Console;
-}
-
-interface WindowEventHandlersEventMap {
-    "afterprint": Event;
-    "beforeprint": Event;
-    "beforeunload": BeforeUnloadEvent;
-    "hashchange": HashChangeEvent;
-    "message": MessageEvent;
-    "offline": Event;
-    "online": Event;
-    "pagehide": PageTransitionEvent;
-    "pageshow": PageTransitionEvent;
-    "popstate": PopStateEvent;
-    "storage": StorageEvent;
-    "unload": Event;
-}
-
-interface WindowEventHandlers {
-    onafterprint: ((this: WindowEventHandlers, ev: Event) => any) | null;
-    onbeforeprint: ((this: WindowEventHandlers, ev: Event) => any) | null;
-    onbeforeunload: ((this: WindowEventHandlers, ev: BeforeUnloadEvent) => any) | null;
-    onhashchange: ((this: WindowEventHandlers, ev: HashChangeEvent) => any) | null;
-    onmessage: ((this: WindowEventHandlers, ev: MessageEvent) => any) | null;
-    onoffline: ((this: WindowEventHandlers, ev: Event) => any) | null;
-    ononline: ((this: WindowEventHandlers, ev: Event) => any) | null;
-    onpagehide: ((this: WindowEventHandlers, ev: PageTransitionEvent) => any) | null;
-    onpageshow: ((this: WindowEventHandlers, ev: PageTransitionEvent) => any) | null;
-    onpopstate: ((this: WindowEventHandlers, ev: PopStateEvent) => any) | null;
-    onstorage: ((this: WindowEventHandlers, ev: StorageEvent) => any) | null;
-    onunload: ((this: WindowEventHandlers, ev: Event) => any) | null;
-    addEventListener<K extends keyof WindowEventHandlersEventMap>(type: K, listener: (this: WindowEventHandlers, ev: WindowEventHandlersEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof WindowEventHandlersEventMap>(type: K, listener: (this: WindowEventHandlers, ev: WindowEventHandlersEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-interface WindowLocalStorage {
-    readonly localStorage: Storage;
-}
-
-interface WindowSessionStorage {
-    readonly sessionStorage: Storage;
-}
-
-interface WindowTimers extends WindowTimersExtension {
-    clearInterval(handle?: number): void;
-    clearTimeout(handle?: number): void;
-    setInterval(handler: (...args: any[]) => void, timeout: number): number;
-    setInterval(handler: any, timeout?: any, ...args: any[]): number;
-    setTimeout(handler: (...args: any[]) => void, timeout: number): number;
-    setTimeout(handler: any, timeout?: any, ...args: any[]): number;
-}
-
-interface WindowTimersExtension {
-    clearImmediate(handle: number): void;
-    setImmediate(handler: (...args: any[]) => void): number;
-    setImmediate(handler: any, ...args: any[]): number;
-}
-
-interface WorkerEventMap extends AbstractWorkerEventMap {
-    "message": MessageEvent;
-}
-
-interface Worker extends EventTarget, AbstractWorker {
-    onmessage: ((this: Worker, ev: MessageEvent) => any) | null;
-    /** @deprecated */
-    postMessage(message: any, transfer?: any[]): void;
-    terminate(): void;
-    addEventListener<K extends keyof WorkerEventMap>(type: K, listener: (this: Worker, ev: WorkerEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof WorkerEventMap>(type: K, listener: (this: Worker, ev: WorkerEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var Worker: {
-    prototype: Worker;
-    new(stringUrl: string): Worker;
-};
-
-interface WritableStream {
-    readonly locked: boolean;
-    abort(reason?: any): Promise<void>;
-    getWriter(): WritableStreamDefaultWriter;
-}
-
-declare var WritableStream: {
-    prototype: WritableStream;
-    new(underlyingSink?: UnderlyingSink, strategy?: QueuingStrategy): WritableStream;
-};
-
-interface WritableStreamDefaultController {
-    error(error?: any): void;
-}
-
-declare var WritableStreamDefaultController: {
-    prototype: WritableStreamDefaultController;
-    new(): WritableStreamDefaultController;
-};
-
-interface WritableStreamDefaultWriter {
-    readonly closed: Promise<void>;
-    readonly desiredSize: number;
-    readonly ready: Promise<void>;
-    abort(reason?: any): Promise<void>;
-    close(): Promise<void>;
-    releaseLock(): void;
-    write(chunk?: any): Promise<any>;
-}
-
-declare var WritableStreamDefaultWriter: {
-    prototype: WritableStreamDefaultWriter;
-    new(): WritableStreamDefaultWriter;
-};
-
-interface XMLDocument extends Document {
-    addEventListener<K extends keyof DocumentEventMap>(type: K, listener: (this: XMLDocument, ev: DocumentEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof DocumentEventMap>(type: K, listener: (this: XMLDocument, ev: DocumentEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var XMLDocument: {
-    prototype: XMLDocument;
-    new(): XMLDocument;
-};
-
-interface XMLHttpRequestEventMap extends XMLHttpRequestEventTargetEventMap {
-    "readystatechange": Event;
-}
-
-interface XMLHttpRequest extends EventTarget, XMLHttpRequestEventTarget {
-    msCaching: string;
-    onreadystatechange: ((this: XMLHttpRequest, ev: Event) => any) | null;
-    readonly readyState: number;
-    readonly response: any;
-    readonly responseText: string;
-    responseType: XMLHttpRequestResponseType;
-    readonly responseURL: string;
-    readonly responseXML: Document | null;
-    readonly status: number;
-    readonly statusText: string;
-    timeout: number;
-    readonly upload: XMLHttpRequestUpload;
-    withCredentials: boolean;
-    abort(): void;
-    getAllResponseHeaders(): string;
-    getResponseHeader(header: string): string | null;
-    msCachingEnabled(): boolean;
-    open(method: string, url: string, async?: boolean, user?: string | null, password?: string | null): void;
-    overrideMimeType(mime: string): void;
-    send(data?: any): void;
-    setRequestHeader(header: string, value: string): void;
-    readonly DONE: number;
-    readonly HEADERS_RECEIVED: number;
-    readonly LOADING: number;
-    readonly OPENED: number;
-    readonly UNSENT: number;
-    addEventListener<K extends keyof XMLHttpRequestEventMap>(type: K, listener: (this: XMLHttpRequest, ev: XMLHttpRequestEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof XMLHttpRequestEventMap>(type: K, listener: (this: XMLHttpRequest, ev: XMLHttpRequestEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var XMLHttpRequest: {
-    prototype: XMLHttpRequest;
-    new(): XMLHttpRequest;
-    readonly DONE: number;
-    readonly HEADERS_RECEIVED: number;
-    readonly LOADING: number;
-    readonly OPENED: number;
-    readonly UNSENT: number;
-};
-
-interface XMLHttpRequestEventTargetEventMap {
-    "abort": Event;
-    "error": ErrorEvent;
-    "load": Event;
-    "loadend": ProgressEvent;
-    "loadstart": Event;
-    "progress": ProgressEvent;
-    "timeout": ProgressEvent;
-}
-
-interface XMLHttpRequestEventTarget {
-    onabort: ((this: XMLHttpRequest, ev: Event) => any) | null;
-    onerror: ((this: XMLHttpRequest, ev: ErrorEvent) => any) | null;
-    onload: ((this: XMLHttpRequest, ev: Event) => any) | null;
-    onloadend: ((this: XMLHttpRequest, ev: ProgressEvent) => any) | null;
-    onloadstart: ((this: XMLHttpRequest, ev: Event) => any) | null;
-    onprogress: ((this: XMLHttpRequest, ev: ProgressEvent) => any) | null;
-    ontimeout: ((this: XMLHttpRequest, ev: ProgressEvent) => any) | null;
-    addEventListener<K extends keyof XMLHttpRequestEventTargetEventMap>(type: K, listener: (this: XMLHttpRequestEventTarget, ev: XMLHttpRequestEventTargetEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof XMLHttpRequestEventTargetEventMap>(type: K, listener: (this: XMLHttpRequestEventTarget, ev: XMLHttpRequestEventTargetEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-interface XMLHttpRequestUpload extends EventTarget, XMLHttpRequestEventTarget {
-    addEventListener<K extends keyof XMLHttpRequestEventTargetEventMap>(type: K, listener: (this: XMLHttpRequestUpload, ev: XMLHttpRequestEventTargetEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof XMLHttpRequestEventTargetEventMap>(type: K, listener: (this: XMLHttpRequestUpload, ev: XMLHttpRequestEventTargetEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var XMLHttpRequestUpload: {
-    prototype: XMLHttpRequestUpload;
-    new(): XMLHttpRequestUpload;
-};
-
-interface XMLSerializer {
-    serializeToString(target: Node): string;
-}
-
-declare var XMLSerializer: {
-    prototype: XMLSerializer;
-    new(): XMLSerializer;
-};
-
-interface XPathEvaluator {
-    createExpression(expression: string, resolver: XPathNSResolver): XPathExpression;
-    createNSResolver(nodeResolver?: Node): XPathNSResolver;
-    evaluate(expression: string, contextNode: Node, resolver: XPathNSResolver | null, type: number, result: XPathResult | null): XPathResult;
-}
-
-declare var XPathEvaluator: {
-    prototype: XPathEvaluator;
-    new(): XPathEvaluator;
-};
-
-interface XPathExpression {
-    evaluate(contextNode: Node, type: number, result: XPathResult | null): XPathResult;
-}
-
-declare var XPathExpression: {
-    prototype: XPathExpression;
-    new(): XPathExpression;
-};
-
-interface XPathNSResolver {
-    lookupNamespaceURI(prefix: string): string;
-}
-
-declare var XPathNSResolver: {
-    prototype: XPathNSResolver;
-    new(): XPathNSResolver;
-};
-
-interface XPathResult {
-    readonly booleanValue: boolean;
-    readonly invalidIteratorState: boolean;
-    readonly numberValue: number;
-    readonly resultType: number;
-    readonly singleNodeValue: Node;
-    readonly snapshotLength: number;
-    readonly stringValue: string;
-    iterateNext(): Node;
-    snapshotItem(index: number): Node;
-    readonly ANY_TYPE: number;
-    readonly ANY_UNORDERED_NODE_TYPE: number;
-    readonly BOOLEAN_TYPE: number;
-    readonly FIRST_ORDERED_NODE_TYPE: number;
-    readonly NUMBER_TYPE: number;
-    readonly ORDERED_NODE_ITERATOR_TYPE: number;
-    readonly ORDERED_NODE_SNAPSHOT_TYPE: number;
-    readonly STRING_TYPE: number;
-    readonly UNORDERED_NODE_ITERATOR_TYPE: number;
-    readonly UNORDERED_NODE_SNAPSHOT_TYPE: number;
-}
-
-declare var XPathResult: {
-    prototype: XPathResult;
-    new(): XPathResult;
-    readonly ANY_TYPE: number;
-    readonly ANY_UNORDERED_NODE_TYPE: number;
-    readonly BOOLEAN_TYPE: number;
-    readonly FIRST_ORDERED_NODE_TYPE: number;
-    readonly NUMBER_TYPE: number;
-    readonly ORDERED_NODE_ITERATOR_TYPE: number;
-    readonly ORDERED_NODE_SNAPSHOT_TYPE: number;
-    readonly STRING_TYPE: number;
-    readonly UNORDERED_NODE_ITERATOR_TYPE: number;
-    readonly UNORDERED_NODE_SNAPSHOT_TYPE: number;
-};
-
-interface XSLTProcessor {
-    clearParameters(): void;
-    getParameter(namespaceURI: string, localName: string): any;
-    importStylesheet(style: Node): void;
-    removeParameter(namespaceURI: string, localName: string): void;
-    reset(): void;
-    setParameter(namespaceURI: string, localName: string, value: any): void;
-    transformToDocument(source: Node): Document;
-    transformToFragment(source: Node, document: Document): DocumentFragment;
-}
-
-declare var XSLTProcessor: {
-    prototype: XSLTProcessor;
-    new(): XSLTProcessor;
-};
-
-interface webkitRTCPeerConnection extends RTCPeerConnection {
-    addEventListener<K extends keyof RTCPeerConnectionEventMap>(type: K, listener: (this: webkitRTCPeerConnection, ev: RTCPeerConnectionEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCPeerConnectionEventMap>(type: K, listener: (this: webkitRTCPeerConnection, ev: RTCPeerConnectionEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var webkitRTCPeerConnection: {
-    prototype: webkitRTCPeerConnection;
-    new(configuration: RTCConfiguration): webkitRTCPeerConnection;
-};
-
-declare type EventListenerOrEventListenerObject = EventListener | EventListenerObject;
-
-interface DecodeErrorCallback {
-    (error: DOMException): void;
-}
-
-interface DecodeSuccessCallback {
-    (decodedData: AudioBuffer): void;
-}
-
-interface ErrorEventHandler {
-    (event: Event | string, source?: string, fileno?: number, columnNumber?: number, error?: Error): void;
-}
-
-interface EventHandlerNonNull {
-    (event: Event): any;
-}
-
-interface ForEachCallback {
-    (keyId: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null, status: MediaKeyStatus): void;
-}
-
-interface FrameRequestCallback {
-    (time: number): void;
-}
-
-interface FunctionStringCallback {
-    (data: string): void;
-}
-
-interface IntersectionObserverCallback {
-    (entries: IntersectionObserverEntry[], observer: IntersectionObserver): void;
-}
-
-interface MSLaunchUriCallback {
-    (): void;
-}
-
-interface MediaQueryListListener {
-    (mql: MediaQueryList): void;
-}
-
-interface MutationCallback {
-    (mutations: MutationRecord[], observer: MutationObserver): void;
-}
-
-interface NavigatorUserMediaErrorCallback {
-    (error: MediaStreamError): void;
-}
-
-interface NavigatorUserMediaSuccessCallback {
-    (stream: MediaStream): void;
-}
-
-interface NotificationPermissionCallback {
-    (permission: NotificationPermission): void;
-}
-
-interface PositionCallback {
-    (position: Position): void;
-}
-
-interface PositionErrorCallback {
-    (error: PositionError): void;
-}
-
-interface RTCPeerConnectionErrorCallback {
-    (error: DOMError): void;
-}
-
-interface RTCSessionDescriptionCallback {
-    (sdp: RTCSessionDescription): void;
-}
-
-interface RTCStatsCallback {
-    (report: RTCStatsReport): void;
-}
-
-interface VoidFunction {
-    (): void;
-}
-
-interface WritableStreamChunkCallback {
-    (chunk: any, controller: WritableStreamDefaultController): void;
-}
-
-interface WritableStreamDefaultControllerCallback {
-    (controller: WritableStreamDefaultController): void;
-}
-
-interface WritableStreamErrorCallback {
-    (reason: string): void;
-}
-
-interface HTMLElementTagNameMap {
-    "a": HTMLAnchorElement;
-    "abbr": HTMLElement;
-    "acronym": HTMLElement;
-    "address": HTMLElement;
-    "applet": HTMLAppletElement;
-    "area": HTMLAreaElement;
-    "article": HTMLElement;
-    "aside": HTMLElement;
-    "audio": HTMLAudioElement;
-    "b": HTMLElement;
-    "base": HTMLBaseElement;
-    "basefont": HTMLBaseFontElement;
-    "bdo": HTMLElement;
-    "big": HTMLElement;
-    "blockquote": HTMLQuoteElement;
-    "body": HTMLBodyElement;
-    "br": HTMLBRElement;
-    "button": HTMLButtonElement;
-    "canvas": HTMLCanvasElement;
-    "caption": HTMLTableCaptionElement;
-    "center": HTMLElement;
-    "cite": HTMLElement;
-    "code": HTMLElement;
-    "col": HTMLTableColElement;
-    "colgroup": HTMLTableColElement;
-    "data": HTMLDataElement;
-    "datalist": HTMLDataListElement;
-    "dd": HTMLElement;
-    "del": HTMLModElement;
-    "dfn": HTMLElement;
-    "dir": HTMLDirectoryElement;
-    "div": HTMLDivElement;
-    "dl": HTMLDListElement;
-    "dt": HTMLElement;
-    "em": HTMLElement;
-    "embed": HTMLEmbedElement;
-    "fieldset": HTMLFieldSetElement;
-    "figcaption": HTMLElement;
-    "figure": HTMLElement;
-    "font": HTMLFontElement;
-    "footer": HTMLElement;
-    "form": HTMLFormElement;
-    "frame": HTMLFrameElement;
-    "frameset": HTMLFrameSetElement;
-    "h1": HTMLHeadingElement;
-    "h2": HTMLHeadingElement;
-    "h3": HTMLHeadingElement;
-    "h4": HTMLHeadingElement;
-    "h5": HTMLHeadingElement;
-    "h6": HTMLHeadingElement;
-    "head": HTMLHeadElement;
-    "header": HTMLElement;
-    "hgroup": HTMLElement;
-    "hr": HTMLHRElement;
-    "html": HTMLHtmlElement;
-    "i": HTMLElement;
-    "iframe": HTMLIFrameElement;
-    "img": HTMLImageElement;
-    "input": HTMLInputElement;
-    "ins": HTMLModElement;
-    "isindex": HTMLUnknownElement;
-    "kbd": HTMLElement;
-    "keygen": HTMLElement;
-    "label": HTMLLabelElement;
-    "legend": HTMLLegendElement;
-    "li": HTMLLIElement;
-    "link": HTMLLinkElement;
-    "listing": HTMLPreElement;
-    "map": HTMLMapElement;
-    "mark": HTMLElement;
-    "marquee": HTMLMarqueeElement;
-    "menu": HTMLMenuElement;
-    "meta": HTMLMetaElement;
-    "meter": HTMLMeterElement;
-    "nav": HTMLElement;
-    "nextid": HTMLUnknownElement;
-    "nobr": HTMLElement;
-    "noframes": HTMLElement;
-    "noscript": HTMLElement;
-    "object": HTMLObjectElement;
-    "ol": HTMLOListElement;
-    "optgroup": HTMLOptGroupElement;
-    "option": HTMLOptionElement;
-    "output": HTMLOutputElement;
-    "p": HTMLParagraphElement;
-    "param": HTMLParamElement;
-    "picture": HTMLPictureElement;
-    "plaintext": HTMLElement;
-    "pre": HTMLPreElement;
-    "progress": HTMLProgressElement;
-    "q": HTMLQuoteElement;
-    "rt": HTMLElement;
-    "ruby": HTMLElement;
-    "s": HTMLElement;
-    "samp": HTMLElement;
-    "script": HTMLScriptElement;
-    "section": HTMLElement;
-    "select": HTMLSelectElement;
-    "slot": HTMLSlotElement;
-    "small": HTMLElement;
-    "source": HTMLSourceElement;
-    "span": HTMLSpanElement;
-    "strike": HTMLElement;
-    "strong": HTMLElement;
-    "style": HTMLStyleElement;
-    "sub": HTMLElement;
-    "sup": HTMLElement;
-    "table": HTMLTableElement;
-    "tbody": HTMLTableSectionElement;
-    "td": HTMLTableDataCellElement;
-    "template": HTMLTemplateElement;
-    "textarea": HTMLTextAreaElement;
-    "tfoot": HTMLTableSectionElement;
-    "th": HTMLTableHeaderCellElement;
-    "thead": HTMLTableSectionElement;
-    "time": HTMLTimeElement;
-    "title": HTMLTitleElement;
-    "tr": HTMLTableRowElement;
-    "track": HTMLTrackElement;
-    "tt": HTMLElement;
-    "u": HTMLElement;
-    "ul": HTMLUListElement;
-    "var": HTMLElement;
-    "video": HTMLVideoElement;
-    "wbr": HTMLElement;
-    "xmp": HTMLPreElement;
-}
-
-interface SVGElementTagNameMap {
-    "circle": SVGCircleElement;
-    "clippath": SVGClipPathElement;
-    "defs": SVGDefsElement;
-    "desc": SVGDescElement;
-    "ellipse": SVGEllipseElement;
-    "feblend": SVGFEBlendElement;
-    "fecolormatrix": SVGFEColorMatrixElement;
-    "fecomponenttransfer": SVGFEComponentTransferElement;
-    "fecomposite": SVGFECompositeElement;
-    "feconvolvematrix": SVGFEConvolveMatrixElement;
-    "fediffuselighting": SVGFEDiffuseLightingElement;
-    "fedisplacementmap": SVGFEDisplacementMapElement;
-    "fedistantlight": SVGFEDistantLightElement;
-    "feflood": SVGFEFloodElement;
-    "fefunca": SVGFEFuncAElement;
-    "fefuncb": SVGFEFuncBElement;
-    "fefuncg": SVGFEFuncGElement;
-    "fefuncr": SVGFEFuncRElement;
-    "fegaussianblur": SVGFEGaussianBlurElement;
-    "feimage": SVGFEImageElement;
-    "femerge": SVGFEMergeElement;
-    "femergenode": SVGFEMergeNodeElement;
-    "femorphology": SVGFEMorphologyElement;
-    "feoffset": SVGFEOffsetElement;
-    "fepointlight": SVGFEPointLightElement;
-    "fespecularlighting": SVGFESpecularLightingElement;
-    "fespotlight": SVGFESpotLightElement;
-    "fetile": SVGFETileElement;
-    "feturbulence": SVGFETurbulenceElement;
-    "filter": SVGFilterElement;
-    "foreignobject": SVGForeignObjectElement;
-    "g": SVGGElement;
-    "image": SVGImageElement;
-    "line": SVGLineElement;
-    "lineargradient": SVGLinearGradientElement;
-    "marker": SVGMarkerElement;
-    "mask": SVGMaskElement;
-    "metadata": SVGMetadataElement;
-    "path": SVGPathElement;
-    "pattern": SVGPatternElement;
-    "polygon": SVGPolygonElement;
-    "polyline": SVGPolylineElement;
-    "radialgradient": SVGRadialGradientElement;
-    "rect": SVGRectElement;
-    "stop": SVGStopElement;
-    "svg": SVGSVGElement;
-    "switch": SVGSwitchElement;
-    "symbol": SVGSymbolElement;
-    "text": SVGTextElement;
-    "textpath": SVGTextPathElement;
-    "tspan": SVGTSpanElement;
-    "use": SVGUseElement;
-    "view": SVGViewElement;
-}
-
-/** @deprecated Directly use HTMLElementTagNameMap or SVGElementTagNameMap as appropriate, instead. */
-interface ElementTagNameMap extends HTMLElementTagNameMap, SVGElementTagNameMap { }
-
-declare var Audio: {
-    new(src?: string): HTMLAudioElement;
-};
-declare var Image: {
-    new(width?: number, height?: number): HTMLImageElement;
-};
-declare var Option: {
-    new(text?: string, value?: string, defaultSelected?: boolean, selected?: boolean): HTMLOptionElement;
-};
-declare var Blob: typeof Blob;
-declare var URL: typeof URL;
-declare var URLSearchParams: typeof URLSearchParams;
-declare var applicationCache: ApplicationCache;
-declare var caches: CacheStorage;
-declare var clientInformation: Navigator;
-declare var closed: boolean;
-declare var crypto: Crypto;
-declare var customElements: CustomElementRegistry;
-declare var defaultStatus: string;
-declare var devicePixelRatio: number;
-declare var doNotTrack: string;
-declare var document: Document;
-declare var event: Event | undefined;
-declare var external: External;
-declare var frameElement: Element;
-declare var frames: Window;
-declare var history: History;
-declare var innerHeight: number;
-declare var innerWidth: number;
-declare var isSecureContext: boolean;
-declare var length: number;
-declare var location: Location;
-declare var locationbar: BarProp;
-declare var menubar: BarProp;
-declare var msContentScript: ExtensionScriptApis;
-declare var msCredentials: MSCredentials;
-declare const name: never;
-declare var navigator: Navigator;
-declare var offscreenBuffering: string | boolean;
-declare var onabort: ((this: Window, ev: UIEvent) => any) | null;
-declare var onafterprint: ((this: Window, ev: Event) => any) | null;
-declare var onbeforeprint: ((this: Window, ev: Event) => any) | null;
-declare var onbeforeunload: ((this: Window, ev: BeforeUnloadEvent) => any) | null;
-declare var onblur: ((this: Window, ev: FocusEvent) => any) | null;
-declare var oncanplay: ((this: Window, ev: Event) => any) | null;
-declare var oncanplaythrough: ((this: Window, ev: Event) => any) | null;
-declare var onchange: ((this: Window, ev: Event) => any) | null;
-declare var onclick: ((this: Window, ev: MouseEvent) => any) | null;
-declare var oncompassneedscalibration: ((this: Window, ev: Event) => any) | null;
-declare var oncontextmenu: ((this: Window, ev: PointerEvent) => any) | null;
-declare var ondblclick: ((this: Window, ev: MouseEvent) => any) | null;
-declare var ondevicelight: ((this: Window, ev: DeviceLightEvent) => any) | null;
-declare var ondevicemotion: ((this: Window, ev: DeviceMotionEvent) => any) | null;
-declare var ondeviceorientation: ((this: Window, ev: DeviceOrientationEvent) => any) | null;
-declare var ondrag: ((this: Window, ev: DragEvent) => any) | null;
-declare var ondragend: ((this: Window, ev: DragEvent) => any) | null;
-declare var ondragenter: ((this: Window, ev: DragEvent) => any) | null;
-declare var ondragleave: ((this: Window, ev: DragEvent) => any) | null;
-declare var ondragover: ((this: Window, ev: DragEvent) => any) | null;
-declare var ondragstart: ((this: Window, ev: DragEvent) => any) | null;
-declare var ondrop: ((this: Window, ev: DragEvent) => any) | null;
-declare var ondurationchange: ((this: Window, ev: Event) => any) | null;
-declare var onemptied: ((this: Window, ev: Event) => any) | null;
-declare var onended: ((this: Window, ev: Event) => any) | null;
-declare var onerror: ErrorEventHandler;
-declare var onfocus: ((this: Window, ev: FocusEvent) => any) | null;
-declare var onhashchange: ((this: Window, ev: HashChangeEvent) => any) | null;
-declare var oninput: ((this: Window, ev: Event) => any) | null;
-declare var oninvalid: ((this: Window, ev: Event) => any) | null;
-declare var onkeydown: ((this: Window, ev: KeyboardEvent) => any) | null;
-declare var onkeypress: ((this: Window, ev: KeyboardEvent) => any) | null;
-declare var onkeyup: ((this: Window, ev: KeyboardEvent) => any) | null;
-declare var onload: ((this: Window, ev: Event) => any) | null;
-declare var onloadeddata: ((this: Window, ev: Event) => any) | null;
-declare var onloadedmetadata: ((this: Window, ev: Event) => any) | null;
-declare var onloadstart: ((this: Window, ev: Event) => any) | null;
-declare var onmessage: ((this: Window, ev: MessageEvent) => any) | null;
-declare var onmousedown: ((this: Window, ev: MouseEvent) => any) | null;
-declare var onmouseenter: ((this: Window, ev: MouseEvent) => any) | null;
-declare var onmouseleave: ((this: Window, ev: MouseEvent) => any) | null;
-declare var onmousemove: ((this: Window, ev: MouseEvent) => any) | null;
-declare var onmouseout: ((this: Window, ev: MouseEvent) => any) | null;
-declare var onmouseover: ((this: Window, ev: MouseEvent) => any) | null;
-declare var onmouseup: ((this: Window, ev: MouseEvent) => any) | null;
-declare var onmousewheel: ((this: Window, ev: WheelEvent) => any) | null;
-declare var onmsgesturechange: ((this: Window, ev: Event) => any) | null;
-declare var onmsgesturedoubletap: ((this: Window, ev: Event) => any) | null;
-declare var onmsgestureend: ((this: Window, ev: Event) => any) | null;
-declare var onmsgesturehold: ((this: Window, ev: Event) => any) | null;
-declare var onmsgesturestart: ((this: Window, ev: Event) => any) | null;
-declare var onmsgesturetap: ((this: Window, ev: Event) => any) | null;
-declare var onmsinertiastart: ((this: Window, ev: Event) => any) | null;
-declare var onmspointercancel: ((this: Window, ev: Event) => any) | null;
-declare var onmspointerdown: ((this: Window, ev: Event) => any) | null;
-declare var onmspointerenter: ((this: Window, ev: Event) => any) | null;
-declare var onmspointerleave: ((this: Window, ev: Event) => any) | null;
-declare var onmspointermove: ((this: Window, ev: Event) => any) | null;
-declare var onmspointerout: ((this: Window, ev: Event) => any) | null;
-declare var onmspointerover: ((this: Window, ev: Event) => any) | null;
-declare var onmspointerup: ((this: Window, ev: Event) => any) | null;
-declare var onoffline: ((this: Window, ev: Event) => any) | null;
-declare var ononline: ((this: Window, ev: Event) => any) | null;
-declare var onorientationchange: ((this: Window, ev: Event) => any) | null;
-declare var onpagehide: ((this: Window, ev: PageTransitionEvent) => any) | null;
-declare var onpageshow: ((this: Window, ev: PageTransitionEvent) => any) | null;
-declare var onpause: ((this: Window, ev: Event) => any) | null;
-declare var onplay: ((this: Window, ev: Event) => any) | null;
-declare var onplaying: ((this: Window, ev: Event) => any) | null;
-declare var onpopstate: ((this: Window, ev: PopStateEvent) => any) | null;
-declare var onprogress: ((this: Window, ev: ProgressEvent) => any) | null;
-declare var onratechange: ((this: Window, ev: Event) => any) | null;
-declare var onreadystatechange: ((this: Window, ev: ProgressEvent) => any) | null;
-declare var onreset: ((this: Window, ev: Event) => any) | null;
-declare var onresize: ((this: Window, ev: UIEvent) => any) | null;
-declare var onscroll: ((this: Window, ev: UIEvent) => any) | null;
-declare var onseeked: ((this: Window, ev: Event) => any) | null;
-declare var onseeking: ((this: Window, ev: Event) => any) | null;
-declare var onselect: ((this: Window, ev: UIEvent) => any) | null;
-declare var onstalled: ((this: Window, ev: Event) => any) | null;
-declare var onstorage: ((this: Window, ev: StorageEvent) => any) | null;
-declare var onsubmit: ((this: Window, ev: Event) => any) | null;
-declare var onsuspend: ((this: Window, ev: Event) => any) | null;
-declare var ontimeupdate: ((this: Window, ev: Event) => any) | null;
-declare var ontouchcancel: (ev: TouchEvent) => any;
-declare var ontouchend: (ev: TouchEvent) => any;
-declare var ontouchmove: (ev: TouchEvent) => any;
-declare var ontouchstart: (ev: TouchEvent) => any;
-declare var onunload: ((this: Window, ev: Event) => any) | null;
-declare var onvolumechange: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplayactivate: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplayblur: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplayconnect: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplaydeactivate: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplaydisconnect: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplayfocus: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplaypointerrestricted: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplaypointerunrestricted: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplaypresentchange: ((this: Window, ev: Event) => any) | null;
-declare var onwaiting: ((this: Window, ev: Event) => any) | null;
-declare var opener: any;
-declare var orientation: string | number;
-declare var outerHeight: number;
-declare var outerWidth: number;
-declare var pageXOffset: number;
-declare var pageYOffset: number;
-declare var parent: Window;
-declare var performance: Performance;
-declare var personalbar: BarProp;
-declare var screen: Screen;
-declare var screenLeft: number;
-declare var screenTop: number;
-declare var screenX: number;
-declare var screenY: number;
-declare var scrollX: number;
-declare var scrollY: number;
-declare var scrollbars: BarProp;
-declare var self: Window;
-declare var speechSynthesis: SpeechSynthesis;
-declare var status: string;
-declare var statusbar: BarProp;
-declare var styleMedia: StyleMedia;
-declare var toolbar: BarProp;
-declare var top: Window;
-declare var window: Window;
-declare function alert(message?: any): void;
-declare function blur(): void;
-declare function cancelAnimationFrame(handle: number): void;
-declare function captureEvents(): void;
-declare function close(): void;
-declare function confirm(message?: string): boolean;
-declare function createImageBitmap(image: HTMLImageElement | SVGImageElement | HTMLVideoElement | HTMLCanvasElement | ImageBitmap | ImageData | Blob, options?: ImageBitmapOptions): Promise<ImageBitmap>;
-declare function createImageBitmap(image: HTMLImageElement | SVGImageElement | HTMLVideoElement | HTMLCanvasElement | ImageBitmap | ImageData | Blob, sx: number, sy: number, sw: number, sh: number, options?: ImageBitmapOptions): Promise<ImageBitmap>;
-declare function departFocus(navigationReason: NavigationReason, origin: FocusNavigationOrigin): void;
-declare function focus(): void;
-declare function getComputedStyle(elt: Element, pseudoElt?: string | null): CSSStyleDeclaration;
-declare function getMatchedCSSRules(elt: Element, pseudoElt?: string | null): CSSRuleList;
-declare function getSelection(): Selection;
-declare function matchMedia(mediaQuery: string): MediaQueryList;
-declare function moveBy(x?: number, y?: number): void;
-declare function moveTo(x?: number, y?: number): void;
-declare function msWriteProfilerMark(profilerMarkName: string): void;
-declare function open(url?: string, target?: string, features?: string, replace?: boolean): Window | null;
-declare function postMessage(message: any, targetOrigin: string, transfer?: any[]): void;
-declare function print(): void;
-declare function prompt(message?: string, _default?: string): string | null;
-declare function releaseEvents(): void;
-declare function requestAnimationFrame(callback: FrameRequestCallback): number;
-declare function resizeBy(x?: number, y?: number): void;
-declare function resizeTo(x?: number, y?: number): void;
-declare function scroll(options?: ScrollToOptions): void;
-declare function scroll(x?: number, y?: number): void;
-declare function scrollBy(options?: ScrollToOptions): void;
-declare function scrollBy(x?: number, y?: number): void;
-declare function scrollTo(options?: ScrollToOptions): void;
-declare function scrollTo(x?: number, y?: number): void;
-declare function stop(): void;
-declare function webkitCancelAnimationFrame(handle: number): void;
-declare function webkitConvertPointFromNodeToPage(node: Node, pt: WebKitPoint): WebKitPoint;
-declare function webkitConvertPointFromPageToNode(node: Node, pt: WebKitPoint): WebKitPoint;
-declare function webkitRequestAnimationFrame(callback: FrameRequestCallback): number;
-declare function toString(): string;
-declare function dispatchEvent(evt: Event): boolean;
-declare function clearInterval(handle?: number): void;
-declare function clearTimeout(handle?: number): void;
-declare function setInterval(handler: (...args: any[]) => void, timeout: number): number;
-declare function setInterval(handler: any, timeout?: any, ...args: any[]): number;
-declare function setTimeout(handler: (...args: any[]) => void, timeout: number): number;
-declare function setTimeout(handler: any, timeout?: any, ...args: any[]): number;
-declare function clearImmediate(handle: number): void;
-declare function setImmediate(handler: (...args: any[]) => void): number;
-declare function setImmediate(handler: any, ...args: any[]): number;
-declare var sessionStorage: Storage;
-declare var localStorage: Storage;
-declare var console: Console;
-declare var onpointercancel: ((this: Window, ev: PointerEvent) => any) | null;
-declare var onpointerdown: ((this: Window, ev: PointerEvent) => any) | null;
-declare var onpointerenter: ((this: Window, ev: PointerEvent) => any) | null;
-declare var onpointerleave: ((this: Window, ev: PointerEvent) => any) | null;
-declare var onpointermove: ((this: Window, ev: PointerEvent) => any) | null;
-declare var onpointerout: ((this: Window, ev: PointerEvent) => any) | null;
-declare var onpointerover: ((this: Window, ev: PointerEvent) => any) | null;
-declare var onpointerup: ((this: Window, ev: PointerEvent) => any) | null;
-declare var onwheel: ((this: Window, ev: WheelEvent) => any) | null;
-declare var indexedDB: IDBFactory;
-declare function atob(encodedString: string): string;
-declare function btoa(rawString: string): string;
-declare function fetch(input?: Request | string, init?: RequestInit): Promise<Response>;
-declare function addEventListener<K extends keyof WindowEventMap>(type: K, listener: (this: Window, ev: WindowEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-declare function addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-declare function removeEventListener<K extends keyof WindowEventMap>(type: K, listener: (this: Window, ev: WindowEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-declare function removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-type ScrollBehavior = "auto" | "instant" | "smooth";
-type ScrollLogicalPosition = "start" | "center" | "end" | "nearest";
-type MouseWheelEvent = WheelEvent;
-type ScrollRestoration = "auto" | "manual";
-type FormDataEntryValue = string | File;
-type InsertPosition = "beforebegin" | "afterbegin" | "beforeend" | "afterend";
-type HeadersInit = Headers | string[][] | { [key: string]: string };
-type OrientationLockType = "any" | "natural" | "portrait" | "landscape" | "portrait-primary" | "portrait-secondary" | "landscape-primary"| "landscape-secondary";
-type IDBValidKey = number | string | Date | IDBArrayKey;
-type AlgorithmIdentifier = string | Algorithm;
-type MutationRecordType = "attributes" | "characterData" | "childList";
-type AAGUID = string;
-type BodyInit = any;
-type ByteString = string;
-type ConstrainBoolean = boolean | ConstrainBooleanParameters;
-type ConstrainDOMString = string | string[] | ConstrainDOMStringParameters;
-type ConstrainDouble = number | ConstrainDoubleRange;
-type ConstrainLong = number | ConstrainLongRange;
-type CryptoOperationData = ArrayBufferView;
-type GLbitfield = number;
-type GLboolean = boolean;
-type GLbyte = number;
-type GLclampf = number;
-type GLenum = number;
-type GLfloat = number;
-type GLint = number;
-type GLintptr = number;
-type GLshort = number;
-type GLsizei = number;
-type GLsizeiptr = number;
-type GLubyte = number;
-type GLuint = number;
-type GLushort = number;
-type IDBKeyPath = string;
-type MSInboundPayload = MSVideoRecvPayload | MSAudioRecvPayload;
-type MSLocalClientEvent = MSLocalClientEventBase | MSAudioLocalClientEvent;
-type MSOutboundPayload = MSVideoSendPayload | MSAudioSendPayload;
-type RTCIceGatherCandidate = RTCIceCandidateDictionary | RTCIceCandidateComplete;
-type RTCTransport = RTCDtlsTransport | RTCSrtpSdesTransport;
-type RequestInfo = Request | string;
-type USVString = string;
-type payloadtype = number;
-type BufferSource = ArrayBuffer | ArrayBufferView;
-type ClientTypes = "window" | "worker" | "sharedworker" | "all";
-type AppendMode = "segments" | "sequence";
-type AudioContextLatencyCategory = "balanced" | "interactive" | "playback";
-type AudioContextState = "suspended" | "running" | "closed";
-type BinaryType = "blob" | "arraybuffer";
-type BiquadFilterType = "lowpass" | "highpass" | "bandpass" | "lowshelf" | "highshelf" | "peaking" | "notch" | "allpass";
-type CanPlayTypeResult = "" | "maybe" | "probably";
-type CanvasFillRule = "nonzero" | "evenodd";
-type ChannelCountMode = "max" | "clamped-max" | "explicit";
-type ChannelInterpretation = "speakers" | "discrete";
-type DisplayCaptureSurfaceType = "monitor" | "window" | "application" | "browser";
-type DistanceModelType = "linear" | "inverse" | "exponential";
-type DocumentReadyState = "loading" | "interactive" | "complete";
-type EndOfStreamError = "network" | "decode";
-type ExpandGranularity = "character" | "word" | "sentence" | "textedit";
-type GamepadHand = "" | "left" | "right";
-type GamepadHapticActuatorType = "vibration";
-type GamepadInputEmulationType = "mouse" | "keyboard" | "gamepad";
-type GamepadMappingType = "" | "standard";
-type IDBCursorDirection = "next" | "nextunique" | "prev" | "prevunique";
-type IDBRequestReadyState = "pending" | "done";
-type IDBTransactionMode = "readonly" | "readwrite" | "versionchange";
-type KeyFormat = "raw" | "spki" | "pkcs8" | "jwk";
-type KeyType = "public" | "private" | "secret";
-type KeyUsage = "encrypt" | "decrypt" | "sign" | "verify" | "deriveKey" | "deriveBits" | "wrapKey" | "unwrapKey";
-type ListeningState = "inactive" | "active" | "disambiguation";
-type MSCredentialType = "FIDO_2_0";
-type MSIceAddrType = "os" | "stun" | "turn" | "peer-derived";
-type MSIceType = "failed" | "direct" | "relay";
-type MSStatsType = "description" | "localclientevent" | "inbound-network" | "outbound-network" | "inbound-payload" | "outbound-payload" | "transportdiagnostics";
-type MSTransportType = "Embedded" | "USB" | "NFC" | "BT";
-type MSWebViewPermissionState = "unknown" | "defer" | "allow" | "deny";
-type MSWebViewPermissionType = "geolocation" | "unlimitedIndexedDBQuota" | "media" | "pointerlock" | "webnotifications";
-type MediaDeviceKind = "audioinput" | "audiooutput" | "videoinput";
-type MediaKeyMessageType = "license-request" | "license-renewal" | "license-release" | "individualization-request";
-type MediaKeySessionType = "temporary" | "persistent-license" | "persistent-release-message";
-type MediaKeyStatus = "usable" | "expired" | "output-downscaled" | "output-not-allowed" | "status-pending" | "internal-error";
-type MediaKeysRequirement = "required" | "optional" | "not-allowed";
-type MediaStreamTrackState = "live" | "ended";
-type NavigationReason = "up" | "down" | "left" | "right";
-type NavigationType = "navigate" | "reload" | "back_forward" | "prerender";
-type NotificationDirection = "auto" | "ltr" | "rtl";
-type NotificationPermission = "default" | "denied" | "granted";
-type OscillatorType = "sine" | "square" | "sawtooth" | "triangle" | "custom";
-type OverSampleType = "none" | "2x" | "4x";
-type PanningModelType = "equalpower" | "HRTF";
-type PaymentComplete = "success" | "fail" | "unknown";
-type PaymentShippingType = "shipping" | "delivery" | "pickup";
-type PushEncryptionKeyName = "p256dh" | "auth";
-type PushPermissionState = "granted" | "denied" | "prompt";
-type RTCBundlePolicy = "balanced" | "max-compat" | "max-bundle";
-type RTCDegradationPreference = "maintain-framerate" | "maintain-resolution" | "balanced";
-type RTCDtlsRole = "auto" | "client" | "server";
-type RTCDtlsTransportState = "new" | "connecting" | "connected" | "closed";
-type RTCIceCandidateType = "host" | "srflx" | "prflx" | "relay";
-type RTCIceComponent = "RTP" | "RTCP";
-type RTCIceConnectionState = "new" | "checking" | "connected" | "completed" | "failed" | "disconnected" | "closed";
-type RTCIceGatherPolicy = "all" | "nohost" | "relay";
-type RTCIceGathererState = "new" | "gathering" | "complete";
-type RTCIceGatheringState = "new" | "gathering" | "complete";
-type RTCIceProtocol = "udp" | "tcp";
-type RTCIceRole = "controlling" | "controlled";
-type RTCIceTcpCandidateType = "active" | "passive" | "so";
-type RTCIceTransportPolicy = "none" | "relay" | "all";
-type RTCIceTransportState = "new" | "checking" | "connected" | "completed" | "disconnected" | "closed";
-type RTCSdpType = "offer" | "pranswer" | "answer";
-type RTCSignalingState = "stable" | "have-local-offer" | "have-remote-offer" | "have-local-pranswer" | "have-remote-pranswer" | "closed";
-type RTCStatsIceCandidatePairState = "frozen" | "waiting" | "inprogress" | "failed" | "succeeded" | "cancelled";
-type RTCStatsIceCandidateType = "host" | "serverreflexive" | "peerreflexive" | "relayed";
-type RTCStatsType = "inboundrtp" | "outboundrtp" | "session" | "datachannel" | "track" | "transport" | "candidatepair" | "localcandidate" | "remotecandidate";
-type ReadyState = "closed" | "open" | "ended";
-type ReferrerPolicy = "" | "no-referrer" | "no-referrer-when-downgrade" | "origin-only" | "origin-when-cross-origin" | "unsafe-url";
-type RequestCache = "default" | "no-store" | "reload" | "no-cache" | "force-cache";
-type RequestCredentials = "omit" | "same-origin" | "include";
-type RequestDestination = "" | "document" | "sharedworker" | "subresource" | "unknown" | "worker";
-type RequestMode = "navigate" | "same-origin" | "no-cors" | "cors";
-type RequestRedirect = "follow" | "error" | "manual";
-type RequestType = "" | "audio" | "font" | "image" | "script" | "style" | "track" | "video";
-type ResponseType = "basic" | "cors" | "default" | "error" | "opaque" | "opaqueredirect";
-type ScopedCredentialType = "ScopedCred";
-type ServiceWorkerState = "installing" | "installed" | "activating" | "activated" | "redundant";
-type TextTrackKind = "subtitles" | "captions" | "descriptions" | "chapters" | "metadata";
-type TextTrackMode = "disabled" | "hidden" | "showing";
-type Transport = "usb" | "nfc" | "ble";
-type VRDisplayEventReason = "mounted" | "navigation" | "requested" | "unmounted";
-type VREye = "left" | "right";
-type VideoFacingModeEnum = "user" | "environment" | "left" | "right";
-type VisibilityState = "hidden" | "visible" | "prerender" | "unloaded";
-type XMLHttpRequestResponseType = "" | "arraybuffer" | "blob" | "document" | "json" | "text";
-
-
-/////////////////////////////
-/// WorkerGlobalScope APIs
-/////////////////////////////
-// These are only available in a Web Worker
-declare function importScripts(...urls: string[]): void;
-
-
-
-
-/////////////////////////////
-/// Windows Script Host APIS
-/////////////////////////////
-
-
-interface ActiveXObject {
-    new (s: string): any;
-}
-declare var ActiveXObject: ActiveXObject;
-
-interface ITextWriter {
-    Write(s: string): void;
-    WriteLine(s: string): void;
-    Close(): void;
-}
-
-interface TextStreamBase {
-    /**
-     * The column number of the current character position in an input stream.
-     */
-    Column: number;
-
-    /**
-     * The current line number in an input stream.
-     */
-    Line: number;
-
-    /**
-     * Closes a text stream.
-     * It is not necessary to close standard streams; they close automatically when the process ends. If
-     * you close a standard stream, be aware that any other pointers to that standard stream become invalid.
-     */
-    Close(): void;
-}
-
-interface TextStreamWriter extends TextStreamBase {
-    /**
-     * Sends a string to an output stream.
-     */
-    Write(s: string): void;
-
-    /**
-     * Sends a specified number of blank lines (newline characters) to an output stream.
-     */
-    WriteBlankLines(intLines: number): void;
-
-    /**
-     * Sends a string followed by a newline character to an output stream.
-     */
-    WriteLine(s: string): void;
-}
-
-interface TextStreamReader extends TextStreamBase {
-    /**
-     * Returns a specified number of characters from an input stream, starting at the current pointer position.
-     * Does not return until the ENTER key is pressed.
-     * Can only be used on a stream in reading mode; causes an error in writing or appending mode.
-     */
-    Read(characters: number): string;
-
-    /**
-     * Returns all characters from an input stream.
-     * Can only be used on a stream in reading mode; causes an error in writing or appending mode.
-     */
-    ReadAll(): string;
-
-    /**
-     * Returns an entire line from an input stream.
-     * Although this method extracts the newline character, it does not add it to the returned string.
-     * Can only be used on a stream in reading mode; causes an error in writing or appending mode.
-     */
-    ReadLine(): string;
-
-    /**
-     * Skips a specified number of characters when reading from an input text stream.
-     * Can only be used on a stream in reading mode; causes an error in writing or appending mode.
-     * @param characters Positive number of characters to skip forward. (Backward skipping is not supported.)
-     */
-    Skip(characters: number): void;
-
-    /**
-     * Skips the next line when reading from an input text stream.
-     * Can only be used on a stream in reading mode, not writing or appending mode.
-     */
-    SkipLine(): void;
-
-    /**
-     * Indicates whether the stream pointer position is at the end of a line.
-     */
-    AtEndOfLine: boolean;
-
-    /**
-     * Indicates whether the stream pointer position is at the end of a stream.
-     */
-    AtEndOfStream: boolean;
-}
-
-declare var WScript: {
-    /**
-     * Outputs text to either a message box (under WScript.exe) or the command console window followed by
-     * a newline (under CScript.exe).
-     */
-    Echo(s: any): void;
-
-    /**
-     * Exposes the write-only error output stream for the current script.
-     * Can be accessed only while using CScript.exe.
-     */
-    StdErr: TextStreamWriter;
-
-    /**
-     * Exposes the write-only output stream for the current script.
-     * Can be accessed only while using CScript.exe.
-     */
-    StdOut: TextStreamWriter;
-    Arguments: { length: number; Item(n: number): string; };
-
-    /**
-     *  The full path of the currently running script.
-     */
-    ScriptFullName: string;
-
-    /**
-     * Forces the script to stop immediately, with an optional exit code.
-     */
-    Quit(exitCode?: number): number;
-
-    /**
-     * The Windows Script Host build version number.
-     */
-    BuildVersion: number;
-
-    /**
-     * Fully qualified path of the host executable.
-     */
-    FullName: string;
-
-    /**
-     * Gets/sets the script mode - interactive(true) or batch(false).
-     */
-    Interactive: boolean;
-
-    /**
-     * The name of the host executable (WScript.exe or CScript.exe).
-     */
-    Name: string;
-
-    /**
-     * Path of the directory containing the host executable.
-     */
-    Path: string;
-
-    /**
-     * The filename of the currently running script.
-     */
-    ScriptName: string;
-
-    /**
-     * Exposes the read-only input stream for the current script.
-     * Can be accessed only while using CScript.exe.
-     */
-    StdIn: TextStreamReader;
-
-    /**
-     * Windows Script Host version
-     */
-    Version: string;
-
-    /**
-     * Connects a COM object's event sources to functions named with a given prefix, in the form prefix_event.
-     */
-    ConnectObject(objEventSource: any, strPrefix: string): void;
-
-    /**
-     * Creates a COM object.
-     * @param strProgiID
-     * @param strPrefix Function names in the form prefix_event will be bound to this object's COM events.
-     */
-    CreateObject(strProgID: string, strPrefix?: string): any;
-
-    /**
-     * Disconnects a COM object from its event sources.
-     */
-    DisconnectObject(obj: any): void;
-
-    /**
-     * Retrieves an existing object with the specified ProgID from memory, or creates a new one from a file.
-     * @param strPathname Fully qualified path to the file containing the object persisted to disk.
-     *                       For objects in memory, pass a zero-length string.
-     * @param strProgID
-     * @param strPrefix Function names in the form prefix_event will be bound to this object's COM events.
-     */
-    GetObject(strPathname: string, strProgID?: string, strPrefix?: string): any;
-
-    /**
-     * Suspends script execution for a specified length of time, then continues execution.
-     * @param intTime Interval (in milliseconds) to suspend script execution.
-     */
-    Sleep(intTime: number): void;
-};
-
-/**
- * WSH is an alias for WScript under Windows Script Host
- */
-declare var WSH: typeof WScript;
-
-/**
- * Represents an Automation SAFEARRAY
- */
-declare class SafeArray<T = any> {
-    private constructor();
-    private SafeArray_typekey: SafeArray<T>;
-}
-
-/**
- * Allows enumerating over a COM collection, which may not have indexed item access.
- */
-interface Enumerator<T = any> {
-    /**
-     * Returns true if the current item is the last one in the collection, or the collection is empty,
-     * or the current item is undefined.
-     */
-    atEnd(): boolean;
-
-    /**
-     * Returns the current item in the collection
-     */
-    item(): T;
-
-    /**
-     * Resets the current item in the collection to the first item. If there are no items in the collection,
-     * the current item is set to undefined.
-     */
-    moveFirst(): void;
-
-    /**
-     * Moves the current item to the next item in the collection. If the enumerator is at the end of
-     * the collection or the collection is empty, the current item is set to undefined.
-     */
-    moveNext(): void;
-}
-
-interface EnumeratorConstructor {
-    new <T = any>(safearray: SafeArray<T>): Enumerator<T>;
-    new <T = any>(collection: { Item(index: any): T }): Enumerator<T>;
-    new <T = any>(collection: any): Enumerator<T>;
-}
-
-declare var Enumerator: EnumeratorConstructor;
-
-/**
- * Enables reading from a COM safe array, which might have an alternate lower bound, or multiple dimensions.
- */
-interface VBArray<T = any> {
-    /**
-     * Returns the number of dimensions (1-based).
-     */
-    dimensions(): number;
-
-    /**
-     * Takes an index for each dimension in the array, and returns the item at the corresponding location.
-     */
-    getItem(dimension1Index: number, ...dimensionNIndexes: number[]): T;
-
-    /**
-     * Returns the smallest available index for a given dimension.
-     * @param dimension 1-based dimension (defaults to 1)
-     */
-    lbound(dimension?: number): number;
-
-    /**
-     * Returns the largest available index for a given dimension.
-     * @param dimension 1-based dimension (defaults to 1)
-     */
-    ubound(dimension?: number): number;
-
-    /**
-     * Returns a Javascript array with all the elements in the VBArray. If there are multiple dimensions,
-     * each successive dimension is appended to the end of the array.
-     * Example: [[1,2,3],[4,5,6]] becomes [1,2,3,4,5,6]
-     */
-    toArray(): T[];
-}
-
-interface VBArrayConstructor {
-    new <T = any>(safeArray: SafeArray<T>): VBArray<T>;
-}
-
-declare var VBArray: VBArrayConstructor;
-
-/**
- * Automation date (VT_DATE)
- */
-declare class VarDate {
-    private constructor();
-    private VarDate_typekey: VarDate;
-}
-
-interface DateConstructor {
-    new (vd: VarDate): Date;
-}
-
-interface Date {
-    getVarDate: () => VarDate;
-}
-
-
-/// <reference path="lib.dom.d.ts" />
-
-interface DOMTokenList {
-    [Symbol.iterator](): IterableIterator<string>;
-}
-
-interface Headers {
-    [Symbol.iterator](): IterableIterator<[string, string]>;
-    /**
-     * Returns an iterator allowing to go through all key/value pairs contained in this object.
-     */
-    entries(): IterableIterator<[string, string]>;
-    /**
-     * Returns an iterator allowing to go through all keys f the key/value pairs contained in this object.
-     */
-    keys(): IterableIterator<string>;
-    /**
-     * Returns an iterator allowing to go through all values of the key/value pairs contained in this object.
-     */
-    values(): IterableIterator<string>;
-}
-
-interface NodeList {
-    /**
-     * Returns an array of key, value pairs for every entry in the list
-     */
-    entries(): IterableIterator<[number, Node]>;
-    /**
-     * Performs the specified action for each node in an list.
-     * @param callbackfn  A function that accepts up to three arguments. forEach calls the callbackfn function one time for each element in the list.
-     * @param thisArg  An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
-     */
-    forEach(callbackfn: (value: Node, index: number, listObj: NodeList) => void, thisArg?: any): void;
-    /**
-     * Returns an list of keys in the list
-     */
-    keys(): IterableIterator<number>;
-
-    /**
-     * Returns an list of values in the list
-     */
-    values(): IterableIterator<Node>;
-
-
-    [Symbol.iterator](): IterableIterator<Node>;
-}
-
-interface NodeListOf<TNode extends Node> {
-
-    /**
-     * Returns an array of key, value pairs for every entry in the list
-     */
-    entries(): IterableIterator<[number, TNode]>;
-
-    /**
-     * Performs the specified action for each node in an list.
-     * @param callbackfn  A function that accepts up to three arguments. forEach calls the callbackfn function one time for each element in the list.
-     * @param thisArg  An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
-     */
-    forEach(callbackfn: (value: TNode, index: number, listObj: NodeListOf<TNode>) => void, thisArg?: any): void;
-    /**
-     * Returns an list of keys in the list
-     */
-    keys(): IterableIterator<number>;
-    /**
-     * Returns an list of values in the list
-     */
-    values(): IterableIterator<TNode>;
-
-    [Symbol.iterator](): IterableIterator<TNode>;
-}
-
-interface HTMLCollectionBase {
-    [Symbol.iterator](): IterableIterator<Element>;
-}
-
-interface HTMLCollectionOf<T extends Element> {
-    [Symbol.iterator](): IterableIterator<T>;
-}
-
-interface FormData {
-    /**
-     * Returns an array of key, value pairs for every entry in the list
-     */
-    entries(): IterableIterator<[string, string | File]>;
-    /**
-     * Returns a list of keys in the list
-     */
-    keys(): IterableIterator<string>;
-    /**
-     * Returns a list of values in the list
-     */
-    values(): IterableIterator<string | File>;
-
-    [Symbol.iterator](): IterableIterator<string | File>;
-}
-
-interface URLSearchParams {
-    /**
-     * Returns an array of key, value pairs for every entry in the search params
-     */
-    entries(): IterableIterator<[string, string]>;
-    /**
-     * Returns a list of keys in the search params
-     */
-    keys(): IterableIterator<string>;
-    /**
-     * Returns a list of values in the search params
-     */
-    values(): IterableIterator<string>;
-    /**
-     * iterate over key/value pairs
-     */
-    [Symbol.iterator](): IterableIterator<[string, string]>;
-}
+/// <reference lib="es2015" />
+/// <reference lib="dom" />
+/// <reference lib="dom.iterable" />
+/// <reference lib="webworker.importscripts" />
+/// <reference lib="scripthost" />
diff --git a/lib/lib.esnext.asynciterable.d.ts b/lib/lib.esnext.asynciterable.d.ts
index d9e17e6d94e..38e12a7caf6 100644
--- a/lib/lib.esnext.asynciterable.d.ts
+++ b/lib/lib.esnext.asynciterable.d.ts
@@ -18,8 +18,8 @@ and limitations under the License.
 /// <reference no-default-lib="true"/>
 
 
-/// <reference path="lib.es2015.symbol.d.ts" />
-/// <reference path="lib.es2015.iterable.d.ts" />
+/// <reference lib="es2015.symbol" />
+/// <reference lib="es2015.iterable" />
 
 interface SymbolConstructor {
     /**
diff --git a/lib/lib.esnext.d.ts b/lib/lib.esnext.d.ts
index c81534fc03b..f06f588f540 100644
--- a/lib/lib.esnext.d.ts
+++ b/lib/lib.esnext.d.ts
@@ -18,7 +18,7 @@ and limitations under the License.
 /// <reference no-default-lib="true"/>
 
 
-/// <reference path="lib.es2018.d.ts" />
-/// <reference path="lib.esnext.asynciterable.d.ts" />
-/// <reference path="lib.esnext.array.d.ts" />
-/// <reference path="lib.esnext.symbol.d.ts" />
+/// <reference lib="es2018" />
+/// <reference lib="esnext.asynciterable" />
+/// <reference lib="esnext.array" />
+/// <reference lib="esnext.symbol" />
diff --git a/lib/lib.esnext.full.d.ts b/lib/lib.esnext.full.d.ts
index bc9e7060f9e..e3c4fa5e03d 100644
--- a/lib/lib.esnext.full.d.ts
+++ b/lib/lib.esnext.full.d.ts
@@ -18,16511 +18,8 @@ and limitations under the License.
 /// <reference no-default-lib="true"/>
 
 
-/// <reference path="lib.es2018.d.ts" />
-/// <reference path="lib.esnext.asynciterable.d.ts" />
-/// <reference path="lib.esnext.array.d.ts" />
-/// <reference path="lib.esnext.symbol.d.ts" />
-
-
-/////////////////////////////
-/// DOM APIs
-/////////////////////////////
-
-interface Account {
-    displayName: string;
-    id: string;
-    imageURL?: string;
-    name?: string;
-    rpDisplayName: string;
-}
-
-interface AddEventListenerOptions extends EventListenerOptions {
-    once?: boolean;
-    passive?: boolean;
-}
-
-interface AesCbcParams extends Algorithm {
-    iv: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-}
-
-interface AesCtrParams extends Algorithm {
-    counter: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-    length: number;
-}
-
-interface AesDerivedKeyParams extends Algorithm {
-    length: number;
-}
-
-interface AesGcmParams extends Algorithm {
-    additionalData?: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-    iv: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-    tagLength?: number;
-}
-
-interface AesKeyAlgorithm extends KeyAlgorithm {
-    length: number;
-}
-
-interface AesKeyGenParams extends Algorithm {
-    length: number;
-}
-
-interface Algorithm {
-    name: string;
-}
-
-interface AnalyserOptions extends AudioNodeOptions {
-    fftSize?: number;
-    maxDecibels?: number;
-    minDecibels?: number;
-    smoothingTimeConstant?: number;
-}
-
-interface AnimationEventInit extends EventInit {
-    animationName?: string;
-    elapsedTime?: number;
-}
-
-interface AssertionOptions {
-    allowList?: ScopedCredentialDescriptor[];
-    extensions?: WebAuthnExtensions;
-    rpId?: string;
-    timeoutSeconds?: number;
-}
-
-interface AudioBufferOptions {
-    length: number;
-    numberOfChannels?: number;
-    sampleRate: number;
-}
-
-interface AudioBufferSourceOptions {
-    buffer?: AudioBuffer | null;
-    detune?: number;
-    loop?: boolean;
-    loopEnd?: number;
-    loopStart?: number;
-    playbackRate?: number;
-}
-
-interface AudioContextInfo {
-    currentTime?: number;
-    sampleRate?: number;
-}
-
-interface AudioContextOptions {
-    latencyHint?: AudioContextLatencyCategory | number;
-    sampleRate?: number;
-}
-
-interface AudioNodeOptions {
-    channelCount?: number;
-    channelCountMode?: ChannelCountMode;
-    channelInterpretation?: ChannelInterpretation;
-}
-
-interface AudioParamDescriptor {
-    defaultValue?: number;
-    maxValue?: number;
-    minValue?: number;
-    name?: string;
-}
-
-interface AudioProcessingEventInit extends EventInit {
-    inputBuffer: AudioBuffer;
-    outputBuffer: AudioBuffer;
-    playbackTime: number;
-}
-
-interface AudioTimestamp {
-    contextTime?: number;
-    performanceTime?: number;
-}
-
-interface BiquadFilterOptions extends AudioNodeOptions {
-    Q?: number;
-    detune?: number;
-    frequency?: number;
-    gain?: number;
-    type?: BiquadFilterType;
-}
-
-interface ByteLengthChunk {
-    byteLength?: number;
-}
-
-interface CacheQueryOptions {
-    cacheName?: string;
-    ignoreMethod?: boolean;
-    ignoreSearch?: boolean;
-    ignoreVary?: boolean;
-}
-
-interface ChannelMergerOptions extends AudioNodeOptions {
-    numberOfInputs?: number;
-}
-
-interface ChannelSplitterOptions extends AudioNodeOptions {
-    numberOfOutputs?: number;
-}
-
-interface ClientData {
-    challenge: string;
-    extensions?: WebAuthnExtensions;
-    hashAlg: string | Algorithm;
-    origin: string;
-    rpId: string;
-    tokenBinding?: string;
-}
-
-interface ClientQueryOptions {
-    includeReserved?: boolean;
-    includeUncontrolled?: boolean;
-    type?: ClientTypes;
-}
-
-interface CloseEventInit extends EventInit {
-    code?: number;
-    reason?: string;
-    wasClean?: boolean;
-}
-
-interface CompositionEventInit extends UIEventInit {
-    data?: string;
-}
-
-interface ConfirmSiteSpecificExceptionsInformation extends ExceptionInformation {
-    arrayOfDomainStrings?: string[];
-}
-
-interface ConstantSourceOptions {
-    offset?: number;
-}
-
-interface ConstrainBooleanParameters {
-    exact?: boolean;
-    ideal?: boolean;
-}
-
-interface ConstrainDOMStringParameters {
-    exact?: string | string[];
-    ideal?: string | string[];
-}
-
-interface ConstrainDoubleRange extends DoubleRange {
-    exact?: number;
-    ideal?: number;
-}
-
-interface ConstrainLongRange extends LongRange {
-    exact?: number;
-    ideal?: number;
-}
-
-interface ConstrainVideoFacingModeParameters {
-    exact?: VideoFacingModeEnum | VideoFacingModeEnum[];
-    ideal?: VideoFacingModeEnum | VideoFacingModeEnum[];
-}
-
-interface ConvolverOptions extends AudioNodeOptions {
-    buffer?: AudioBuffer | null;
-    disableNormalization?: boolean;
-}
-
-interface CustomEventInit<T = any> extends EventInit {
-    detail?: T;
-}
-
-interface DOMRectInit {
-    height?: number;
-    width?: number;
-    x?: number;
-    y?: number;
-}
-
-interface DelayOptions extends AudioNodeOptions {
-    delayTime?: number;
-    maxDelayTime?: number;
-}
-
-interface DeviceAccelerationDict {
-    x?: number | null;
-    y?: number | null;
-    z?: number | null;
-}
-
-interface DeviceLightEventInit extends EventInit {
-    value?: number;
-}
-
-interface DeviceMotionEventInit extends EventInit {
-    acceleration?: DeviceAccelerationDict | null;
-    accelerationIncludingGravity?: DeviceAccelerationDict | null;
-    interval?: number | null;
-    rotationRate?: DeviceRotationRateDict | null;
-}
-
-interface DeviceOrientationEventInit extends EventInit {
-    absolute?: boolean;
-    alpha?: number | null;
-    beta?: number | null;
-    gamma?: number | null;
-}
-
-interface DeviceRotationRateDict {
-    alpha?: number | null;
-    beta?: number | null;
-    gamma?: number | null;
-}
-
-interface DoubleRange {
-    max?: number;
-    min?: number;
-}
-
-interface DynamicsCompressorOptions extends AudioNodeOptions {
-    attack?: number;
-    knee?: number;
-    ratio?: number;
-    release?: number;
-    threshold?: number;
-}
-
-interface EcKeyAlgorithm extends KeyAlgorithm {
-    namedCurve: string;
-}
-
-interface EcKeyGenParams extends Algorithm {
-    namedCurve: string;
-}
-
-interface EcKeyImportParams extends Algorithm {
-    namedCurve: string;
-}
-
-interface EcdhKeyDeriveParams extends Algorithm {
-    public: CryptoKey;
-}
-
-interface EcdsaParams extends Algorithm {
-    hash: string | Algorithm;
-}
-
-interface ErrorEventInit extends EventInit {
-    colno?: number;
-    error?: any;
-    filename?: string;
-    lineno?: number;
-    message?: string;
-}
-
-interface EventInit {
-    bubbles?: boolean;
-    cancelable?: boolean;
-    scoped?: boolean;
-}
-
-interface EventListenerOptions {
-    capture?: boolean;
-}
-
-interface EventModifierInit extends UIEventInit {
-    altKey?: boolean;
-    ctrlKey?: boolean;
-    metaKey?: boolean;
-    modifierAltGraph?: boolean;
-    modifierCapsLock?: boolean;
-    modifierFn?: boolean;
-    modifierFnLock?: boolean;
-    modifierHyper?: boolean;
-    modifierNumLock?: boolean;
-    modifierOS?: boolean;
-    modifierScrollLock?: boolean;
-    modifierSuper?: boolean;
-    modifierSymbol?: boolean;
-    modifierSymbolLock?: boolean;
-    shiftKey?: boolean;
-}
-
-interface ExceptionInformation {
-    domain?: string | null;
-}
-
-interface ExtendableEventInit extends EventInit {
-}
-
-interface ExtendableMessageEventInit extends ExtendableEventInit {
-    data?: any;
-    lastEventId?: string;
-    origin?: string;
-    ports?: MessagePort[] | null;
-    source?: object | ServiceWorker | MessagePort | null;
-}
-
-interface FetchEventInit extends ExtendableEventInit {
-    clientId?: string;
-    request: Request;
-    reservedClientId?: string;
-    targetClientId?: string;
-}
-
-interface FocusEventInit extends UIEventInit {
-    relatedTarget?: EventTarget | null;
-}
-
-interface FocusNavigationEventInit extends EventInit {
-    navigationReason?: string | null;
-    originHeight?: number;
-    originLeft?: number;
-    originTop?: number;
-    originWidth?: number;
-}
-
-interface FocusNavigationOrigin {
-    originHeight?: number;
-    originLeft?: number;
-    originTop?: number;
-    originWidth?: number;
-}
-
-interface GainOptions extends AudioNodeOptions {
-    gain?: number;
-}
-
-interface GamepadEventInit extends EventInit {
-    gamepad?: Gamepad;
-}
-
-interface GetNotificationOptions {
-    tag?: string;
-}
-
-interface HashChangeEventInit extends EventInit {
-    newURL?: string;
-    oldURL?: string;
-}
-
-interface HkdfParams extends Algorithm {
-    hash: string | Algorithm;
-    info: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-    salt: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-}
-
-interface HmacImportParams extends Algorithm {
-    hash: string | Algorithm;
-    length?: number;
-}
-
-interface HmacKeyAlgorithm extends KeyAlgorithm {
-    hash: KeyAlgorithm;
-    length: number;
-}
-
-interface HmacKeyGenParams extends Algorithm {
-    hash: string | Algorithm;
-    length?: number;
-}
-
-interface IDBIndexParameters {
-    multiEntry?: boolean;
-    unique?: boolean;
-}
-
-interface IDBObjectStoreParameters {
-    autoIncrement?: boolean;
-    keyPath?: string | string[];
-}
-
-interface IIRFilterOptions extends AudioNodeOptions {
-    feedback: number[];
-    feedforward: number[];
-}
-
-interface IntersectionObserverEntryInit {
-    boundingClientRect: DOMRectInit;
-    intersectionRect: DOMRectInit;
-    isIntersecting: boolean;
-    rootBounds: DOMRectInit;
-    target: Element;
-    time: number;
-}
-
-interface IntersectionObserverInit {
-    root?: Element | null;
-    rootMargin?: string;
-    threshold?: number | number[];
-}
-
-interface JsonWebKey {
-    alg?: string;
-    crv?: string;
-    d?: string;
-    dp?: string;
-    dq?: string;
-    e?: string;
-    ext?: boolean;
-    k?: string;
-    key_ops?: string[];
-    kty?: string;
-    n?: string;
-    oth?: RsaOtherPrimesInfo[];
-    p?: string;
-    q?: string;
-    qi?: string;
-    use?: string;
-    x?: string;
-    y?: string;
-}
-
-interface KeyAlgorithm {
-    name: string;
-}
-
-interface KeyboardEventInit extends EventModifierInit {
-    code?: string;
-    key?: string;
-    location?: number;
-    repeat?: boolean;
-}
-
-interface LongRange {
-    max?: number;
-    min?: number;
-}
-
-interface MSAccountInfo {
-    accountImageUri?: string;
-    accountName?: string;
-    rpDisplayName: string;
-    userDisplayName: string;
-    userId?: string;
-}
-
-interface MSAudioLocalClientEvent extends MSLocalClientEventBase {
-    cpuInsufficientEventRatio?: number;
-    deviceCaptureNotFunctioningEventRatio?: number;
-    deviceClippingEventRatio?: number;
-    deviceEchoEventRatio?: number;
-    deviceGlitchesEventRatio?: number;
-    deviceHalfDuplexAECEventRatio?: number;
-    deviceHowlingEventCount?: number;
-    deviceLowSNREventRatio?: number;
-    deviceLowSpeechLevelEventRatio?: number;
-    deviceMultipleEndpointsEventCount?: number;
-    deviceNearEndToEchoRatioEventRatio?: number;
-    deviceRenderMuteEventRatio?: number;
-    deviceRenderNotFunctioningEventRatio?: number;
-    deviceRenderZeroVolumeEventRatio?: number;
-    networkDelayEventRatio?: number;
-    networkSendQualityEventRatio?: number;
-}
-
-interface MSAudioRecvPayload extends MSPayloadBase {
-    burstLossLength1?: number;
-    burstLossLength2?: number;
-    burstLossLength3?: number;
-    burstLossLength4?: number;
-    burstLossLength5?: number;
-    burstLossLength6?: number;
-    burstLossLength7?: number;
-    burstLossLength8OrHigher?: number;
-    fecRecvDistance1?: number;
-    fecRecvDistance2?: number;
-    fecRecvDistance3?: number;
-    packetReorderDepthAvg?: number;
-    packetReorderDepthMax?: number;
-    packetReorderRatio?: number;
-    ratioCompressedSamplesAvg?: number;
-    ratioConcealedSamplesAvg?: number;
-    ratioStretchedSamplesAvg?: number;
-    samplingRate?: number;
-    signal?: MSAudioRecvSignal;
-}
-
-interface MSAudioRecvSignal {
-    initialSignalLevelRMS?: number;
-    recvNoiseLevelCh1?: number;
-    recvSignalLevelCh1?: number;
-    renderLoopbackSignalLevel?: number;
-    renderNoiseLevel?: number;
-    renderSignalLevel?: number;
-}
-
-interface MSAudioSendPayload extends MSPayloadBase {
-    audioFECUsed?: boolean;
-    samplingRate?: number;
-    sendMutePercent?: number;
-    signal?: MSAudioSendSignal;
-}
-
-interface MSAudioSendSignal {
-    noiseLevel?: number;
-    sendNoiseLevelCh1?: number;
-    sendSignalLevelCh1?: number;
-}
-
-interface MSConnectivity {
-    iceType?: MSIceType;
-    iceWarningFlags?: MSIceWarningFlags;
-    relayAddress?: MSRelayAddress;
-}
-
-interface MSCredentialFilter {
-    accept?: MSCredentialSpec[];
-}
-
-interface MSCredentialParameters {
-    type?: MSCredentialType;
-}
-
-interface MSCredentialSpec {
-    id?: string;
-    type: MSCredentialType;
-}
-
-interface MSDCCEventInit extends EventInit {
-    maxFr?: number;
-    maxFs?: number;
-}
-
-interface MSDSHEventInit extends EventInit {
-    sources?: number[];
-    timestamp?: number;
-}
-
-interface MSDelay {
-    roundTrip?: number;
-    roundTripMax?: number;
-}
-
-interface MSDescription extends RTCStats {
-    connectivity?: MSConnectivity;
-    deviceDevName?: string;
-    localAddr?: MSIPAddressInfo;
-    networkconnectivity?: MSNetworkConnectivityInfo;
-    reflexiveLocalIPAddr?: MSIPAddressInfo;
-    remoteAddr?: MSIPAddressInfo;
-    transport?: RTCIceProtocol;
-}
-
-interface MSFIDOCredentialParameters extends MSCredentialParameters {
-    algorithm?: string | Algorithm;
-    authenticators?: string[];
-}
-
-interface MSIPAddressInfo {
-    ipAddr?: string;
-    manufacturerMacAddrMask?: string;
-    port?: number;
-}
-
-interface MSIceWarningFlags {
-    allocationMessageIntegrityFailed?: boolean;
-    alternateServerReceived?: boolean;
-    connCheckMessageIntegrityFailed?: boolean;
-    connCheckOtherError?: boolean;
-    fipsAllocationFailure?: boolean;
-    multipleRelayServersAttempted?: boolean;
-    noRelayServersConfigured?: boolean;
-    portRangeExhausted?: boolean;
-    pseudoTLSFailure?: boolean;
-    tcpNatConnectivityFailed?: boolean;
-    tcpRelayConnectivityFailed?: boolean;
-    turnAuthUnknownUsernameError?: boolean;
-    turnTcpAllocateFailed?: boolean;
-    turnTcpSendFailed?: boolean;
-    turnTcpTimedOut?: boolean;
-    turnTurnTcpConnectivityFailed?: boolean;
-    turnUdpAllocateFailed?: boolean;
-    turnUdpSendFailed?: boolean;
-    udpLocalConnectivityFailed?: boolean;
-    udpNatConnectivityFailed?: boolean;
-    udpRelayConnectivityFailed?: boolean;
-    useCandidateChecksFailed?: boolean;
-}
-
-interface MSJitter {
-    interArrival?: number;
-    interArrivalMax?: number;
-    interArrivalSD?: number;
-}
-
-interface MSLocalClientEventBase extends RTCStats {
-    networkBandwidthLowEventRatio?: number;
-    networkReceiveQualityEventRatio?: number;
-}
-
-interface MSNetwork extends RTCStats {
-    delay?: MSDelay;
-    jitter?: MSJitter;
-    packetLoss?: MSPacketLoss;
-    utilization?: MSUtilization;
-}
-
-interface MSNetworkConnectivityInfo {
-    linkspeed?: number;
-    networkConnectionDetails?: string;
-    vpn?: boolean;
-}
-
-interface MSNetworkInterfaceType {
-    interfaceTypeEthernet?: boolean;
-    interfaceTypePPP?: boolean;
-    interfaceTypeTunnel?: boolean;
-    interfaceTypeWWAN?: boolean;
-    interfaceTypeWireless?: boolean;
-}
-
-interface MSOutboundNetwork extends MSNetwork {
-    appliedBandwidthLimit?: number;
-}
-
-interface MSPacketLoss {
-    lossRate?: number;
-    lossRateMax?: number;
-}
-
-interface MSPayloadBase extends RTCStats {
-    payloadDescription?: string;
-}
-
-interface MSPortRange {
-    max?: number;
-    min?: number;
-}
-
-interface MSRelayAddress {
-    port?: number;
-    relayAddress?: string;
-}
-
-interface MSSignatureParameters {
-    userPrompt?: string;
-}
-
-interface MSTransportDiagnosticsStats extends RTCStats {
-    allocationTimeInMs?: number;
-    baseAddress?: string;
-    baseInterface?: MSNetworkInterfaceType;
-    iceRole?: RTCIceRole;
-    iceWarningFlags?: MSIceWarningFlags;
-    interfaces?: MSNetworkInterfaceType;
-    localAddrType?: MSIceAddrType;
-    localAddress?: string;
-    localInterface?: MSNetworkInterfaceType;
-    localMR?: string;
-    localMRTCPPort?: number;
-    localSite?: string;
-    msRtcEngineVersion?: string;
-    networkName?: string;
-    numConsentReqReceived?: number;
-    numConsentReqSent?: number;
-    numConsentRespReceived?: number;
-    numConsentRespSent?: number;
-    portRangeMax?: number;
-    portRangeMin?: number;
-    protocol?: RTCIceProtocol;
-    remoteAddrType?: MSIceAddrType;
-    remoteAddress?: string;
-    remoteMR?: string;
-    remoteMRTCPPort?: number;
-    remoteSite?: string;
-    rtpRtcpMux?: boolean;
-    stunVer?: number;
-}
-
-interface MSUtilization {
-    bandwidthEstimation?: number;
-    bandwidthEstimationAvg?: number;
-    bandwidthEstimationMax?: number;
-    bandwidthEstimationMin?: number;
-    bandwidthEstimationStdDev?: number;
-    packets?: number;
-}
-
-interface MSVideoPayload extends MSPayloadBase {
-    durationSeconds?: number;
-    resolution?: string;
-    videoBitRateAvg?: number;
-    videoBitRateMax?: number;
-    videoFrameRateAvg?: number;
-    videoPacketLossRate?: number;
-}
-
-interface MSVideoRecvPayload extends MSVideoPayload {
-    lowBitRateCallPercent?: number;
-    lowFrameRateCallPercent?: number;
-    recvBitRateAverage?: number;
-    recvBitRateMaximum?: number;
-    recvCodecType?: string;
-    recvFpsHarmonicAverage?: number;
-    recvFrameRateAverage?: number;
-    recvNumResSwitches?: number;
-    recvReorderBufferMaxSuccessfullyOrderedExtent?: number;
-    recvReorderBufferMaxSuccessfullyOrderedLateTime?: number;
-    recvReorderBufferPacketsDroppedDueToBufferExhaustion?: number;
-    recvReorderBufferPacketsDroppedDueToTimeout?: number;
-    recvReorderBufferReorderedPackets?: number;
-    recvResolutionHeight?: number;
-    recvResolutionWidth?: number;
-    recvVideoStreamsMax?: number;
-    recvVideoStreamsMin?: number;
-    recvVideoStreamsMode?: number;
-    reorderBufferTotalPackets?: number;
-    videoFrameLossRate?: number;
-    videoPostFECPLR?: number;
-    videoResolutions?: MSVideoResolutionDistribution;
-}
-
-interface MSVideoResolutionDistribution {
-    cifQuality?: number;
-    h1080Quality?: number;
-    h1440Quality?: number;
-    h2160Quality?: number;
-    h720Quality?: number;
-    vgaQuality?: number;
-}
-
-interface MSVideoSendPayload extends MSVideoPayload {
-    sendBitRateAverage?: number;
-    sendBitRateMaximum?: number;
-    sendFrameRateAverage?: number;
-    sendResolutionHeight?: number;
-    sendResolutionWidth?: number;
-    sendVideoStreamsMax?: number;
-}
-
-interface MediaElementAudioSourceOptions {
-    mediaElement: HTMLMediaElement;
-}
-
-interface MediaEncryptedEventInit extends EventInit {
-    initData?: ArrayBuffer | null;
-    initDataType?: string;
-}
-
-interface MediaKeyMessageEventInit extends EventInit {
-    message?: ArrayBuffer | null;
-    messageType?: MediaKeyMessageType;
-}
-
-interface MediaKeySystemConfiguration {
-    audioCapabilities?: MediaKeySystemMediaCapability[];
-    distinctiveIdentifier?: MediaKeysRequirement;
-    initDataTypes?: string[];
-    persistentState?: MediaKeysRequirement;
-    videoCapabilities?: MediaKeySystemMediaCapability[];
-}
-
-interface MediaKeySystemMediaCapability {
-    contentType?: string;
-    robustness?: string;
-}
-
-interface MediaStreamConstraints {
-    audio?: boolean | MediaTrackConstraints;
-    video?: boolean | MediaTrackConstraints;
-}
-
-interface MediaStreamErrorEventInit extends EventInit {
-    error?: MediaStreamError | null;
-}
-
-interface MediaStreamEventInit extends EventInit {
-    stream?: MediaStream;
-}
-
-interface MediaStreamTrackEventInit extends EventInit {
-    track?: MediaStreamTrack | null;
-}
-
-interface MediaTrackCapabilities {
-    aspectRatio?: number | DoubleRange;
-    deviceId?: string;
-    echoCancellation?: boolean[];
-    facingMode?: string;
-    frameRate?: number | DoubleRange;
-    groupId?: string;
-    height?: number | LongRange;
-    sampleRate?: number | LongRange;
-    sampleSize?: number | LongRange;
-    volume?: number | DoubleRange;
-    width?: number | LongRange;
-}
-
-interface MediaTrackConstraintSet {
-    aspectRatio?: number | ConstrainDoubleRange;
-    channelCount?: number | ConstrainLongRange;
-    deviceId?: string | string[] | ConstrainDOMStringParameters;
-    displaySurface?: string | string[] | ConstrainDOMStringParameters;
-    echoCancellation?: boolean | ConstrainBooleanParameters;
-    facingMode?: string | string[] | ConstrainDOMStringParameters;
-    frameRate?: number | ConstrainDoubleRange;
-    groupId?: string | string[] | ConstrainDOMStringParameters;
-    height?: number | ConstrainLongRange;
-    latency?: number | ConstrainDoubleRange;
-    logicalSurface?: boolean | ConstrainBooleanParameters;
-    sampleRate?: number | ConstrainLongRange;
-    sampleSize?: number | ConstrainLongRange;
-    volume?: number | ConstrainDoubleRange;
-    width?: number | ConstrainLongRange;
-}
-
-interface MediaTrackConstraints extends MediaTrackConstraintSet {
-    advanced?: MediaTrackConstraintSet[];
-}
-
-interface MediaTrackSettings {
-    aspectRatio?: number;
-    deviceId?: string;
-    echoCancellation?: boolean;
-    facingMode?: string;
-    frameRate?: number;
-    groupId?: string;
-    height?: number;
-    sampleRate?: number;
-    sampleSize?: number;
-    volume?: number;
-    width?: number;
-}
-
-interface MediaTrackSupportedConstraints {
-    aspectRatio?: boolean;
-    deviceId?: boolean;
-    echoCancellation?: boolean;
-    facingMode?: boolean;
-    frameRate?: boolean;
-    groupId?: boolean;
-    height?: boolean;
-    sampleRate?: boolean;
-    sampleSize?: boolean;
-    volume?: boolean;
-    width?: boolean;
-}
-
-interface MessageEventInit extends EventInit {
-    channel?: string;
-    data?: any;
-    lastEventId?: string;
-    origin?: string;
-    ports?: MessagePort[];
-    source?: Window | null;
-}
-
-interface MouseEventInit extends EventModifierInit {
-    button?: number;
-    buttons?: number;
-    clientX?: number;
-    clientY?: number;
-    relatedTarget?: EventTarget | null;
-    screenX?: number;
-    screenY?: number;
-}
-
-interface MsZoomToOptions {
-    animate?: string;
-    contentX?: number;
-    contentY?: number;
-    scaleFactor?: number;
-    viewportX?: string | null;
-    viewportY?: string | null;
-}
-
-interface MutationObserverInit {
-    attributeFilter?: string[];
-    attributeOldValue?: boolean;
-    attributes?: boolean;
-    characterData?: boolean;
-    characterDataOldValue?: boolean;
-    childList?: boolean;
-    subtree?: boolean;
-}
-
-interface NotificationEventInit extends ExtendableEventInit {
-    action?: string;
-    notification: Notification;
-}
-
-interface NotificationOptions {
-    body?: string;
-    data?: any;
-    dir?: NotificationDirection;
-    icon?: string;
-    lang?: string;
-    tag?: string;
-}
-
-interface ObjectURLOptions {
-    oneTimeOnly?: boolean;
-}
-
-interface OfflineAudioCompletionEventInit extends EventInit {
-    renderedBuffer: AudioBuffer;
-}
-
-interface OscillatorOptions extends AudioNodeOptions {
-    detune?: number;
-    frequency?: number;
-    periodicWave?: PeriodicWave;
-    type?: OscillatorType;
-}
-
-interface PannerOptions extends AudioNodeOptions {
-    coneInnerAngle?: number;
-    coneOuterAngle?: number;
-    coneOuterGain?: number;
-    distanceModel?: DistanceModelType;
-    maxDistance?: number;
-    orientationX?: number;
-    orientationY?: number;
-    orientationZ?: number;
-    panningModel?: PanningModelType;
-    positionX?: number;
-    positionY?: number;
-    positionZ?: number;
-    refDistance?: number;
-    rolloffFactor?: number;
-}
-
-interface PaymentCurrencyAmount {
-    currency: string;
-    currencySystem?: string;
-    value: string;
-}
-
-interface PaymentDetailsBase {
-    displayItems?: PaymentItem[];
-    modifiers?: PaymentDetailsModifier[];
-    shippingOptions?: PaymentShippingOption[];
-}
-
-interface PaymentDetailsInit extends PaymentDetailsBase {
-    id?: string;
-    total: PaymentItem;
-}
-
-interface PaymentDetailsModifier {
-    additionalDisplayItems?: PaymentItem[];
-    data?: any;
-    supportedMethods: string | string[];
-    total?: PaymentItem;
-}
-
-interface PaymentDetailsUpdate extends PaymentDetailsBase {
-    error?: string;
-    total?: PaymentItem;
-}
-
-interface PaymentItem {
-    amount: PaymentCurrencyAmount;
-    label: string;
-    pending?: boolean;
-}
-
-interface PaymentMethodData {
-    data?: any;
-    supportedMethods: string | string[];
-}
-
-interface PaymentOptions {
-    requestPayerEmail?: boolean;
-    requestPayerName?: boolean;
-    requestPayerPhone?: boolean;
-    requestShipping?: boolean;
-    shippingType?: string;
-}
-
-interface PaymentRequestUpdateEventInit extends EventInit {
-}
-
-interface PaymentShippingOption {
-    amount: PaymentCurrencyAmount;
-    id: string;
-    label: string;
-    selected?: boolean;
-}
-
-interface Pbkdf2Params extends Algorithm {
-    hash: string | Algorithm;
-    iterations: number;
-    salt: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-}
-
-interface PeriodicWaveConstraints {
-    disableNormalization?: boolean;
-}
-
-interface PeriodicWaveOptions extends PeriodicWaveConstraints {
-    imag?: number[];
-    real?: number[];
-}
-
-interface PointerEventInit extends MouseEventInit {
-    height?: number;
-    isPrimary?: boolean;
-    pointerId?: number;
-    pointerType?: string;
-    pressure?: number;
-    tiltX?: number;
-    tiltY?: number;
-    width?: number;
-}
-
-interface PopStateEventInit extends EventInit {
-    state?: any;
-}
-
-interface PositionOptions {
-    enableHighAccuracy?: boolean;
-    maximumAge?: number;
-    timeout?: number;
-}
-
-interface ProgressEventInit extends EventInit {
-    lengthComputable?: boolean;
-    loaded?: number;
-    total?: number;
-}
-
-interface PushEventInit extends ExtendableEventInit {
-    data?: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | string | null;
-}
-
-interface PushSubscriptionChangeInit extends ExtendableEventInit {
-    newSubscription?: PushSubscription;
-    oldSubscription?: PushSubscription;
-}
-
-interface PushSubscriptionOptionsInit {
-    applicationServerKey?: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | string | null;
-    userVisibleOnly?: boolean;
-}
-
-interface QueuingStrategy {
-    highWaterMark?: number;
-    size?: WritableStreamChunkCallback;
-}
-
-interface RTCConfiguration {
-    bundlePolicy?: RTCBundlePolicy;
-    iceServers?: RTCIceServer[];
-    iceTransportPolicy?: RTCIceTransportPolicy;
-    peerIdentity?: string;
-}
-
-interface RTCDTMFToneChangeEventInit extends EventInit {
-    tone?: string;
-}
-
-interface RTCDtlsFingerprint {
-    algorithm?: string;
-    value?: string;
-}
-
-interface RTCDtlsParameters {
-    fingerprints?: RTCDtlsFingerprint[];
-    role?: RTCDtlsRole;
-}
-
-interface RTCIceCandidateAttributes extends RTCStats {
-    addressSourceUrl?: string;
-    candidateType?: RTCStatsIceCandidateType;
-    ipAddress?: string;
-    portNumber?: number;
-    priority?: number;
-    transport?: string;
-}
-
-interface RTCIceCandidateComplete {
-}
-
-interface RTCIceCandidateDictionary {
-    foundation?: string;
-    ip?: string;
-    msMTurnSessionId?: string;
-    port?: number;
-    priority?: number;
-    protocol?: RTCIceProtocol;
-    relatedAddress?: string;
-    relatedPort?: number;
-    tcpType?: RTCIceTcpCandidateType;
-    type?: RTCIceCandidateType;
-}
-
-interface RTCIceCandidateInit {
-    candidate?: string;
-    sdpMLineIndex?: number;
-    sdpMid?: string;
-}
-
-interface RTCIceCandidatePair {
-    local?: RTCIceCandidateDictionary;
-    remote?: RTCIceCandidateDictionary;
-}
-
-interface RTCIceCandidatePairStats extends RTCStats {
-    availableIncomingBitrate?: number;
-    availableOutgoingBitrate?: number;
-    bytesReceived?: number;
-    bytesSent?: number;
-    localCandidateId?: string;
-    nominated?: boolean;
-    priority?: number;
-    readable?: boolean;
-    remoteCandidateId?: string;
-    roundTripTime?: number;
-    state?: RTCStatsIceCandidatePairState;
-    transportId?: string;
-    writable?: boolean;
-}
-
-interface RTCIceGatherOptions {
-    gatherPolicy?: RTCIceGatherPolicy;
-    iceservers?: RTCIceServer[];
-    portRange?: MSPortRange;
-}
-
-interface RTCIceParameters {
-    iceLite?: boolean | null;
-    password?: string;
-    usernameFragment?: string;
-}
-
-interface RTCIceServer {
-    credential?: string | null;
-    urls?: any;
-    username?: string | null;
-}
-
-interface RTCInboundRTPStreamStats extends RTCRTPStreamStats {
-    bytesReceived?: number;
-    fractionLost?: number;
-    jitter?: number;
-    packetsLost?: number;
-    packetsReceived?: number;
-}
-
-interface RTCMediaStreamTrackStats extends RTCStats {
-    audioLevel?: number;
-    echoReturnLoss?: number;
-    echoReturnLossEnhancement?: number;
-    frameHeight?: number;
-    frameWidth?: number;
-    framesCorrupted?: number;
-    framesDecoded?: number;
-    framesDropped?: number;
-    framesPerSecond?: number;
-    framesReceived?: number;
-    framesSent?: number;
-    remoteSource?: boolean;
-    ssrcIds?: string[];
-    trackIdentifier?: string;
-}
-
-interface RTCOfferOptions {
-    iceRestart?: boolean;
-    offerToReceiveAudio?: number;
-    offerToReceiveVideo?: number;
-    voiceActivityDetection?: boolean;
-}
-
-interface RTCOutboundRTPStreamStats extends RTCRTPStreamStats {
-    bytesSent?: number;
-    packetsSent?: number;
-    roundTripTime?: number;
-    targetBitrate?: number;
-}
-
-interface RTCPeerConnectionIceEventInit extends EventInit {
-    candidate?: RTCIceCandidate;
-}
-
-interface RTCRTPStreamStats extends RTCStats {
-    associateStatsId?: string;
-    codecId?: string;
-    firCount?: number;
-    isRemote?: boolean;
-    mediaTrackId?: string;
-    mediaType?: string;
-    nackCount?: number;
-    pliCount?: number;
-    sliCount?: number;
-    ssrc?: string;
-    transportId?: string;
-}
-
-interface RTCRtcpFeedback {
-    parameter?: string;
-    type?: string;
-}
-
-interface RTCRtcpParameters {
-    cname?: string;
-    mux?: boolean;
-    reducedSize?: boolean;
-    ssrc?: number;
-}
-
-interface RTCRtpCapabilities {
-    codecs?: RTCRtpCodecCapability[];
-    fecMechanisms?: string[];
-    headerExtensions?: RTCRtpHeaderExtension[];
-}
-
-interface RTCRtpCodecCapability {
-    clockRate?: number;
-    kind?: string;
-    maxSpatialLayers?: number;
-    maxTemporalLayers?: number;
-    maxptime?: number;
-    name?: string;
-    numChannels?: number;
-    options?: any;
-    parameters?: any;
-    preferredPayloadType?: number;
-    ptime?: number;
-    rtcpFeedback?: RTCRtcpFeedback[];
-    svcMultiStreamSupport?: boolean;
-}
-
-interface RTCRtpCodecParameters {
-    clockRate?: number;
-    maxptime?: number;
-    name?: string;
-    numChannels?: number;
-    parameters?: any;
-    payloadType?: number;
-    ptime?: number;
-    rtcpFeedback?: RTCRtcpFeedback[];
-}
-
-interface RTCRtpContributingSource {
-    audioLevel?: number;
-    csrc?: number;
-    timestamp?: number;
-}
-
-interface RTCRtpEncodingParameters {
-    active?: boolean;
-    codecPayloadType?: number;
-    dependencyEncodingIds?: string[];
-    encodingId?: string;
-    fec?: RTCRtpFecParameters;
-    framerateScale?: number;
-    maxBitrate?: number;
-    maxFramerate?: number;
-    minQuality?: number;
-    priority?: number;
-    resolutionScale?: number;
-    rtx?: RTCRtpRtxParameters;
-    ssrc?: number;
-    ssrcRange?: RTCSsrcRange;
-}
-
-interface RTCRtpFecParameters {
-    mechanism?: string;
-    ssrc?: number;
-}
-
-interface RTCRtpHeaderExtension {
-    kind?: string;
-    preferredEncrypt?: boolean;
-    preferredId?: number;
-    uri?: string;
-}
-
-interface RTCRtpHeaderExtensionParameters {
-    encrypt?: boolean;
-    id?: number;
-    uri?: string;
-}
-
-interface RTCRtpParameters {
-    codecs?: RTCRtpCodecParameters[];
-    degradationPreference?: RTCDegradationPreference;
-    encodings?: RTCRtpEncodingParameters[];
-    headerExtensions?: RTCRtpHeaderExtensionParameters[];
-    muxId?: string;
-    rtcp?: RTCRtcpParameters;
-}
-
-interface RTCRtpRtxParameters {
-    ssrc?: number;
-}
-
-interface RTCRtpUnhandled {
-    muxId?: string;
-    payloadType?: number;
-    ssrc?: number;
-}
-
-interface RTCSessionDescriptionInit {
-    sdp?: string;
-    type?: RTCSdpType;
-}
-
-interface RTCSrtpKeyParam {
-    keyMethod?: string;
-    keySalt?: string;
-    lifetime?: string;
-    mkiLength?: number;
-    mkiValue?: number;
-}
-
-interface RTCSrtpSdesParameters {
-    cryptoSuite?: string;
-    keyParams?: RTCSrtpKeyParam[];
-    sessionParams?: string[];
-    tag?: number;
-}
-
-interface RTCSsrcRange {
-    max?: number;
-    min?: number;
-}
-
-interface RTCStats {
-    id?: string;
-    msType?: MSStatsType;
-    timestamp?: number;
-    type?: RTCStatsType;
-}
-
-interface RTCStatsReport {
-}
-
-interface RTCTransportStats extends RTCStats {
-    activeConnection?: boolean;
-    bytesReceived?: number;
-    bytesSent?: number;
-    localCertificateId?: string;
-    remoteCertificateId?: string;
-    rtcpTransportStatsId?: string;
-    selectedCandidatePairId?: string;
-}
-
-interface RegistrationOptions {
-    scope?: string;
-}
-
-interface RequestInit {
-    body?: Blob | Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | FormData | string | null;
-    cache?: RequestCache;
-    credentials?: RequestCredentials;
-    headers?: HeadersInit;
-    integrity?: string;
-    keepalive?: boolean;
-    method?: string;
-    mode?: RequestMode;
-    redirect?: RequestRedirect;
-    referrer?: string;
-    referrerPolicy?: ReferrerPolicy;
-    signal?: AbortSignal;
-    window?: any;
-}
-
-interface ResponseInit {
-    headers?: HeadersInit;
-    status?: number;
-    statusText?: string;
-}
-
-interface RsaHashedImportParams extends Algorithm {
-    hash: string | Algorithm;
-}
-
-interface RsaHashedKeyAlgorithm extends RsaKeyAlgorithm {
-    hash: KeyAlgorithm;
-}
-
-interface RsaHashedKeyGenParams extends RsaKeyGenParams {
-    hash: string | Algorithm;
-}
-
-interface RsaKeyAlgorithm extends KeyAlgorithm {
-    modulusLength: number;
-    publicExponent: Uint8Array;
-}
-
-interface RsaKeyGenParams extends Algorithm {
-    modulusLength: number;
-    publicExponent: Uint8Array;
-}
-
-interface RsaOaepParams extends Algorithm {
-    label?: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-}
-
-interface RsaOtherPrimesInfo {
-    d?: string;
-    r?: string;
-    t?: string;
-}
-
-interface RsaPssParams extends Algorithm {
-    saltLength: number;
-}
-
-interface ScopedCredentialDescriptor {
-    id: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null;
-    transports?: Transport[];
-    type: ScopedCredentialType;
-}
-
-interface ScopedCredentialOptions {
-    excludeList?: ScopedCredentialDescriptor[];
-    extensions?: WebAuthnExtensions;
-    rpId?: string;
-    timeoutSeconds?: number;
-}
-
-interface ScopedCredentialParameters {
-    algorithm: string | Algorithm;
-    type: ScopedCredentialType;
-}
-
-interface SecurityPolicyViolationEventInit extends EventInit {
-    blockedURI?: string;
-    columnNumber?: number;
-    documentURI?: string;
-    effectiveDirective?: string;
-    lineNumber?: number;
-    originalPolicy?: string;
-    referrer?: string;
-    sourceFile?: string;
-    statusCode?: number;
-    violatedDirective?: string;
-}
-
-interface ServiceWorkerMessageEventInit extends EventInit {
-    data?: any;
-    lastEventId?: string;
-    origin?: string;
-    ports?: MessagePort[] | null;
-    source?: ServiceWorker | MessagePort | null;
-}
-
-interface SpeechSynthesisEventInit extends EventInit {
-    charIndex?: number;
-    charLength?: number;
-    elapsedTime?: number;
-    name?: string;
-    utterance?: SpeechSynthesisUtterance | null;
-}
-
-interface StereoPannerOptions extends AudioNodeOptions {
-    pan?: number;
-}
-
-interface StoreExceptionsInformation extends ExceptionInformation {
-    detailURI?: string | null;
-    explanationString?: string | null;
-    siteName?: string | null;
-}
-
-interface StoreSiteSpecificExceptionsInformation extends StoreExceptionsInformation {
-    arrayOfDomainStrings?: string[];
-}
-
-interface SyncEventInit extends ExtendableEventInit {
-    lastChance?: boolean;
-    tag: string;
-}
-
-interface TextDecodeOptions {
-    stream?: boolean;
-}
-
-interface TextDecoderOptions {
-    fatal?: boolean;
-    ignoreBOM?: boolean;
-}
-
-interface TrackEventInit extends EventInit {
-    track?: VideoTrack | AudioTrack | TextTrack | null;
-}
-
-interface TransitionEventInit extends EventInit {
-    elapsedTime?: number;
-    propertyName?: string;
-}
-
-interface UIEventInit extends EventInit {
-    detail?: number;
-    view?: Window | null;
-}
-
-interface UnderlyingSink {
-    abort?: WritableStreamErrorCallback;
-    close?: WritableStreamDefaultControllerCallback;
-    start: WritableStreamDefaultControllerCallback;
-    write?: WritableStreamChunkCallback;
-}
-
-interface VRDisplayEventInit extends EventInit {
-    display: VRDisplay;
-    reason?: VRDisplayEventReason;
-}
-
-interface VRLayer {
-    leftBounds?: number[] | null;
-    rightBounds?: number[] | null;
-    source?: HTMLCanvasElement | null;
-}
-
-interface VRStageParameters {
-    sittingToStandingTransform?: Float32Array;
-    sizeX?: number;
-    sizeY?: number;
-}
-
-interface WaveShaperOptions extends AudioNodeOptions {
-    curve?: number[];
-    oversample?: OverSampleType;
-}
-
-interface WebAuthnExtensions {
-}
-
-interface WebGLContextAttributes {
-    alpha?: boolean;
-    antialias?: boolean;
-    depth?: boolean;
-    failIfMajorPerformanceCaveat?: boolean;
-    premultipliedAlpha?: boolean;
-    preserveDrawingBuffer?: boolean;
-    stencil?: boolean;
-}
-
-interface WebGLContextEventInit extends EventInit {
-    statusMessage?: string;
-}
-
-interface WheelEventInit extends MouseEventInit {
-    deltaMode?: number;
-    deltaX?: number;
-    deltaY?: number;
-    deltaZ?: number;
-}
-
-interface EventListener {
-    (evt: Event): void;
-}
-
-type WebKitEntriesCallback = ((entries: WebKitEntry[]) => void) | { handleEvent(entries: WebKitEntry[]): void; };
-
-type WebKitErrorCallback = ((err: DOMError) => void) | { handleEvent(err: DOMError): void; };
-
-type WebKitFileCallback = ((file: File) => void) | { handleEvent(file: File): void; };
-
-interface ANGLE_instanced_arrays {
-    drawArraysInstancedANGLE(mode: number, first: number, count: number, primcount: number): void;
-    drawElementsInstancedANGLE(mode: number, count: number, type: number, offset: number, primcount: number): void;
-    vertexAttribDivisorANGLE(index: number, divisor: number): void;
-    readonly VERTEX_ATTRIB_ARRAY_DIVISOR_ANGLE: number;
-}
-
-declare var ANGLE_instanced_arrays: {
-    prototype: ANGLE_instanced_arrays;
-    new(): ANGLE_instanced_arrays;
-    readonly VERTEX_ATTRIB_ARRAY_DIVISOR_ANGLE: number;
-};
-
-interface AbortController {
-    readonly signal: AbortSignal;
-    abort(): void;
-}
-
-declare var AbortController: {
-    prototype: AbortController;
-    new(): AbortController;
-};
-
-interface AbortSignalEventMap {
-    "abort": ProgressEvent;
-}
-
-interface AbortSignal extends EventTarget {
-    readonly aborted: boolean;
-    onabort: ((this: AbortSignal, ev: ProgressEvent) => any) | null;
-    addEventListener<K extends keyof AbortSignalEventMap>(type: K, listener: (this: AbortSignal, ev: AbortSignalEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof AbortSignalEventMap>(type: K, listener: (this: AbortSignal, ev: AbortSignalEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var AbortSignal: {
-    prototype: AbortSignal;
-    new(): AbortSignal;
-};
-
-interface AbstractWorkerEventMap {
-    "error": ErrorEvent;
-}
-
-interface AbstractWorker {
-    onerror: ((this: AbstractWorker, ev: ErrorEvent) => any) | null;
-    addEventListener<K extends keyof AbstractWorkerEventMap>(type: K, listener: (this: AbstractWorker, ev: AbstractWorkerEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof AbstractWorkerEventMap>(type: K, listener: (this: AbstractWorker, ev: AbstractWorkerEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-interface AesCfbParams extends Algorithm {
-    iv: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer;
-}
-
-interface AesCmacParams extends Algorithm {
-    length: number;
-}
-
-interface AnalyserNode extends AudioNode {
-    fftSize: number;
-    readonly frequencyBinCount: number;
-    maxDecibels: number;
-    minDecibels: number;
-    smoothingTimeConstant: number;
-    getByteFrequencyData(array: Uint8Array): void;
-    getByteTimeDomainData(array: Uint8Array): void;
-    getFloatFrequencyData(array: Float32Array): void;
-    getFloatTimeDomainData(array: Float32Array): void;
-}
-
-declare var AnalyserNode: {
-    prototype: AnalyserNode;
-    new(): AnalyserNode;
-};
-
-interface Animation {
-    currentTime: number | null;
-    effect: AnimationEffectReadOnly;
-    readonly finished: Promise<Animation>;
-    id: string;
-    readonly pending: boolean;
-    readonly playState: "idle" | "running" | "paused" | "finished";
-    playbackRate: number;
-    readonly ready: Promise<Animation>;
-    startTime: number;
-    timeline: AnimationTimeline;
-    cancel(): void;
-    finish(): void;
-    oncancel: (this: Animation, ev: AnimationPlaybackEvent) => any;
-    onfinish: (this: Animation, ev: AnimationPlaybackEvent) => any;
-    pause(): void;
-    play(): void;
-    reverse(): void;
-}
-
-declare var Animation: {
-    prototype: Animation;
-    new(effect?: AnimationEffectReadOnly, timeline?: AnimationTimeline): Animation;
-};
-
-interface AnimationEffectReadOnly {
-    readonly timing: number;
-    getComputedTiming(): ComputedTimingProperties;
-}
-
-interface AnimationEvent extends Event {
-    readonly animationName: string;
-    readonly elapsedTime: number;
-}
-
-declare var AnimationEvent: {
-    prototype: AnimationEvent;
-    new(typeArg: string, eventInitDict?: AnimationEventInit): AnimationEvent;
-};
-
-interface AnimationKeyFrame {
-    easing?: string | string[];
-    offset?: number | null | (number | null)[];
-    [index: string]: string | number | number[] | string[] | null | (number | null)[] | undefined;
-}
-
-interface AnimationOptions {
-    delay?: number;
-    direction?: "normal" | "reverse" | "alternate" | "alternate-reverse";
-    duration?: number;
-    easing?: string;
-    endDelay?: number;
-    fill?: "none" | "forwards" | "backwards" | "both"| "auto";
-    id?: string;
-    iterationStart?: number;
-    iterations?: number;
-}
-
-interface AnimationPlaybackEvent extends Event {
-    readonly currentTime: number | null;
-    readonly timelineTime: number | null;
-}
-
-declare var AnimationPlaybackEvent: {
-    prototype: AnimationPlaybackEvent;
-    new(type: string, eventInitDict?: AnimationPlaybackEventInit): AnimationPlaybackEvent;
-};
-
-interface AnimationPlaybackEventInit extends EventInit {
-    currentTime?: number | null;
-    timelineTime?: number | null;
-}
-
-interface AnimationTimeline {
-    readonly currentTime: number | null;
-}
-
-interface ApplicationCacheEventMap {
-    "cached": Event;
-    "checking": Event;
-    "downloading": Event;
-    "error": Event;
-    "noupdate": Event;
-    "obsolete": Event;
-    "progress": ProgressEvent;
-    "updateready": Event;
-}
-
-interface ApplicationCache extends EventTarget {
-    oncached: ((this: ApplicationCache, ev: Event) => any) | null;
-    onchecking: ((this: ApplicationCache, ev: Event) => any) | null;
-    ondownloading: ((this: ApplicationCache, ev: Event) => any) | null;
-    onerror: ((this: ApplicationCache, ev: Event) => any) | null;
-    onnoupdate: ((this: ApplicationCache, ev: Event) => any) | null;
-    onobsolete: ((this: ApplicationCache, ev: Event) => any) | null;
-    onprogress: ((this: ApplicationCache, ev: ProgressEvent) => any) | null;
-    onupdateready: ((this: ApplicationCache, ev: Event) => any) | null;
-    readonly status: number;
-    abort(): void;
-    swapCache(): void;
-    update(): void;
-    readonly CHECKING: number;
-    readonly DOWNLOADING: number;
-    readonly IDLE: number;
-    readonly OBSOLETE: number;
-    readonly UNCACHED: number;
-    readonly UPDATEREADY: number;
-    addEventListener<K extends keyof ApplicationCacheEventMap>(type: K, listener: (this: ApplicationCache, ev: ApplicationCacheEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof ApplicationCacheEventMap>(type: K, listener: (this: ApplicationCache, ev: ApplicationCacheEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var ApplicationCache: {
-    prototype: ApplicationCache;
-    new(): ApplicationCache;
-    readonly CHECKING: number;
-    readonly DOWNLOADING: number;
-    readonly IDLE: number;
-    readonly OBSOLETE: number;
-    readonly UNCACHED: number;
-    readonly UPDATEREADY: number;
-};
-
-interface AssignedNodesOptions {
-    flatten?: boolean;
-}
-
-interface Attr extends Node {
-    readonly name: string;
-    readonly ownerElement: Element | null;
-    readonly prefix: string | null;
-    readonly specified: boolean;
-    value: string;
-}
-
-declare var Attr: {
-    prototype: Attr;
-    new(): Attr;
-};
-
-interface AudioBuffer {
-    readonly duration: number;
-    readonly length: number;
-    readonly numberOfChannels: number;
-    readonly sampleRate: number;
-    copyFromChannel(destination: Float32Array, channelNumber: number, startInChannel?: number): void;
-    copyToChannel(source: Float32Array, channelNumber: number, startInChannel?: number): void;
-    getChannelData(channel: number): Float32Array;
-}
-
-declare var AudioBuffer: {
-    prototype: AudioBuffer;
-    new(): AudioBuffer;
-};
-
-interface AudioBufferSourceNodeEventMap {
-    "ended": Event;
-}
-
-interface AudioBufferSourceNode extends AudioNode {
-    buffer: AudioBuffer | null;
-    readonly detune: AudioParam;
-    loop: boolean;
-    loopEnd: number;
-    loopStart: number;
-    onended: ((this: AudioBufferSourceNode, ev: Event) => any) | null;
-    readonly playbackRate: AudioParam;
-    start(when?: number, offset?: number, duration?: number): void;
-    stop(when?: number): void;
-    addEventListener<K extends keyof AudioBufferSourceNodeEventMap>(type: K, listener: (this: AudioBufferSourceNode, ev: AudioBufferSourceNodeEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof AudioBufferSourceNodeEventMap>(type: K, listener: (this: AudioBufferSourceNode, ev: AudioBufferSourceNodeEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var AudioBufferSourceNode: {
-    prototype: AudioBufferSourceNode;
-    new(): AudioBufferSourceNode;
-};
-
-interface AudioContextEventMap {
-    "statechange": Event;
-}
-
-interface AudioContextBase extends EventTarget {
-    readonly currentTime: number;
-    readonly destination: AudioDestinationNode;
-    readonly listener: AudioListener;
-    onstatechange: ((this: AudioContext, ev: Event) => any) | null;
-    readonly sampleRate: number;
-    readonly state: AudioContextState;
-    close(): Promise<void>;
-    createAnalyser(): AnalyserNode;
-    createBiquadFilter(): BiquadFilterNode;
-    createBuffer(numberOfChannels: number, length: number, sampleRate: number): AudioBuffer;
-    createBufferSource(): AudioBufferSourceNode;
-    createChannelMerger(numberOfInputs?: number): ChannelMergerNode;
-    createChannelSplitter(numberOfOutputs?: number): ChannelSplitterNode;
-    createConvolver(): ConvolverNode;
-    createDelay(maxDelayTime?: number): DelayNode;
-    createDynamicsCompressor(): DynamicsCompressorNode;
-    createGain(): GainNode;
-    createIIRFilter(feedforward: number[], feedback: number[]): IIRFilterNode;
-    createMediaElementSource(mediaElement: HTMLMediaElement): MediaElementAudioSourceNode;
-    createMediaStreamSource(mediaStream: MediaStream): MediaStreamAudioSourceNode;
-    createOscillator(): OscillatorNode;
-    createPanner(): PannerNode;
-    createPeriodicWave(real: Float32Array, imag: Float32Array, constraints?: PeriodicWaveConstraints): PeriodicWave;
-    createScriptProcessor(bufferSize?: number, numberOfInputChannels?: number, numberOfOutputChannels?: number): ScriptProcessorNode;
-    createStereoPanner(): StereoPannerNode;
-    createWaveShaper(): WaveShaperNode;
-    decodeAudioData(audioData: ArrayBuffer, successCallback?: DecodeSuccessCallback, errorCallback?: DecodeErrorCallback): Promise<AudioBuffer>;
-    resume(): Promise<void>;
-    addEventListener<K extends keyof AudioContextEventMap>(type: K, listener: (this: AudioContext, ev: AudioContextEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof AudioContextEventMap>(type: K, listener: (this: AudioContext, ev: AudioContextEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-interface AudioContext extends AudioContextBase {
-    suspend(): Promise<void>;
-}
-
-declare var AudioContext: {
-    prototype: AudioContext;
-    new(): AudioContext;
-};
-
-interface AudioDestinationNode extends AudioNode {
-    readonly maxChannelCount: number;
-}
-
-declare var AudioDestinationNode: {
-    prototype: AudioDestinationNode;
-    new(): AudioDestinationNode;
-};
-
-interface AudioListener {
-    /** @deprecated */
-    dopplerFactor: number;
-    /** @deprecated */
-    speedOfSound: number;
-    /** @deprecated */
-    setOrientation(x: number, y: number, z: number, xUp: number, yUp: number, zUp: number): void;
-    /** @deprecated */
-    setPosition(x: number, y: number, z: number): void;
-    /** @deprecated */
-    setVelocity(x: number, y: number, z: number): void;
-}
-
-declare var AudioListener: {
-    prototype: AudioListener;
-    new(): AudioListener;
-};
-
-interface AudioNode extends EventTarget {
-    channelCount: number;
-    channelCountMode: ChannelCountMode;
-    channelInterpretation: ChannelInterpretation;
-    readonly context: AudioContext;
-    readonly numberOfInputs: number;
-    readonly numberOfOutputs: number;
-    connect(destination: AudioNode, output?: number, input?: number): AudioNode;
-    connect(destination: AudioParam, output?: number): void;
-    disconnect(): void;
-    disconnect(output: number): void;
-    disconnect(destination: AudioNode): void;
-    disconnect(destination: AudioNode, output: number): void;
-    disconnect(destination: AudioNode, output: number, input: number): void;
-    disconnect(destination: AudioParam): void;
-    disconnect(destination: AudioParam, output: number): void;
-}
-
-declare var AudioNode: {
-    prototype: AudioNode;
-    new(): AudioNode;
-};
-
-interface AudioParam {
-    readonly defaultValue: number;
-    value: number;
-    cancelScheduledValues(cancelTime: number): AudioParam;
-    exponentialRampToValueAtTime(value: number, endTime: number): AudioParam;
-    linearRampToValueAtTime(value: number, endTime: number): AudioParam;
-    setTargetAtTime(target: number, startTime: number, timeConstant: number): AudioParam;
-    setValueAtTime(value: number, startTime: number): AudioParam;
-    setValueCurveAtTime(values: number[], startTime: number, duration: number): AudioParam;
-}
-
-declare var AudioParam: {
-    prototype: AudioParam;
-    new(): AudioParam;
-};
-
-interface AudioProcessingEvent extends Event {
-    readonly inputBuffer: AudioBuffer;
-    readonly outputBuffer: AudioBuffer;
-    readonly playbackTime: number;
-}
-
-declare var AudioProcessingEvent: {
-    prototype: AudioProcessingEvent;
-    new(): AudioProcessingEvent;
-};
-
-interface AudioTrack {
-    enabled: boolean;
-    readonly id: string;
-    kind: string;
-    readonly label: string;
-    language: string;
-    readonly sourceBuffer: SourceBuffer;
-}
-
-declare var AudioTrack: {
-    prototype: AudioTrack;
-    new(): AudioTrack;
-};
-
-interface AudioTrackListEventMap {
-    "addtrack": TrackEvent;
-    "change": Event;
-    "removetrack": TrackEvent;
-}
-
-interface AudioTrackList extends EventTarget {
-    readonly length: number;
-    onaddtrack: ((this: AudioTrackList, ev: TrackEvent) => any) | null;
-    onchange: ((this: AudioTrackList, ev: Event) => any) | null;
-    onremovetrack: ((this: AudioTrackList, ev: TrackEvent) => any) | null;
-    getTrackById(id: string): AudioTrack | null;
-    item(index: number): AudioTrack;
-    addEventListener<K extends keyof AudioTrackListEventMap>(type: K, listener: (this: AudioTrackList, ev: AudioTrackListEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof AudioTrackListEventMap>(type: K, listener: (this: AudioTrackList, ev: AudioTrackListEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-    [index: number]: AudioTrack;
-}
-
-declare var AudioTrackList: {
-    prototype: AudioTrackList;
-    new(): AudioTrackList;
-};
-
-interface BarProp {
-    readonly visible: boolean;
-}
-
-declare var BarProp: {
-    prototype: BarProp;
-    new(): BarProp;
-};
-
-interface BeforeUnloadEvent extends Event {
-    returnValue: any;
-}
-
-declare var BeforeUnloadEvent: {
-    prototype: BeforeUnloadEvent;
-    new(): BeforeUnloadEvent;
-};
-
-interface BhxBrowser {
-    readonly lastError: DOMException;
-    checkMatchesGlobExpression(pattern: string, value: string): boolean;
-    checkMatchesUriExpression(pattern: string, value: string): boolean;
-    clearLastError(): void;
-    currentWindowId(): number;
-    fireExtensionApiTelemetry(functionName: string, isSucceeded: boolean, isSupported: boolean, errorString: string): void;
-    genericFunction(functionId: number, destination: any, parameters?: string, callbackId?: number): void;
-    genericSynchronousFunction(functionId: number, parameters?: string): string;
-    getExtensionId(): string;
-    getThisAddress(): any;
-    registerGenericFunctionCallbackHandler(callbackHandler: Function): void;
-    registerGenericListenerHandler(eventHandler: Function): void;
-    setLastError(parameters: string): void;
-    webPlatformGenericFunction(destination: any, parameters?: string, callbackId?: number): void;
-}
-
-declare var BhxBrowser: {
-    prototype: BhxBrowser;
-    new(): BhxBrowser;
-};
-
-interface BiquadFilterNode extends AudioNode {
-    readonly Q: AudioParam;
-    readonly detune: AudioParam;
-    readonly frequency: AudioParam;
-    readonly gain: AudioParam;
-    type: BiquadFilterType;
-    getFrequencyResponse(frequencyHz: Float32Array, magResponse: Float32Array, phaseResponse: Float32Array): void;
-}
-
-declare var BiquadFilterNode: {
-    prototype: BiquadFilterNode;
-    new(): BiquadFilterNode;
-};
-
-interface Blob {
-    readonly size: number;
-    readonly type: string;
-    msClose(): void;
-    msDetachStream(): any;
-    slice(start?: number, end?: number, contentType?: string): Blob;
-}
-
-declare var Blob: {
-    prototype: Blob;
-    new (blobParts?: any[], options?: BlobPropertyBag): Blob;
-};
-
-interface BlobPropertyBag {
-    endings?: string;
-    type?: string;
-}
-
-interface Body {
-    readonly bodyUsed: boolean;
-    arrayBuffer(): Promise<ArrayBuffer>;
-    blob(): Promise<Blob>;
-    formData(): Promise<FormData>;
-    json(): Promise<any>;
-    text(): Promise<string>;
-}
-
-interface BroadcastChannel extends EventTarget {
-    readonly name: string;
-    onmessage: (ev: MessageEvent) => any;
-    onmessageerror: (ev: MessageEvent) => any;
-    addEventListener<K extends keyof BroadcastChannelEventMap>(type: K, listener: (this: BroadcastChannel, ev: BroadcastChannelEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    close(): void;
-    postMessage(message: any): void;
-    removeEventListener<K extends keyof BroadcastChannelEventMap>(type: K, listener: (this: BroadcastChannel, ev: BroadcastChannelEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var BroadcastChannel: {
-    prototype: BroadcastChannel;
-    new(name: string): BroadcastChannel;
-};
-
-interface BroadcastChannelEventMap {
-    message: MessageEvent;
-    messageerror: MessageEvent;
-}
-
-interface ByteLengthQueuingStrategy {
-    highWaterMark: number;
-    size(chunk?: any): number;
-}
-
-declare var ByteLengthQueuingStrategy: {
-    prototype: ByteLengthQueuingStrategy;
-    new(strategy: QueuingStrategy): ByteLengthQueuingStrategy;
-};
-
-interface CDATASection extends Text {
-}
-
-declare var CDATASection: {
-    prototype: CDATASection;
-    new(): CDATASection;
-};
-
-interface CSS {
-    escape(value: string): string;
-    supports(property: string, value?: string): boolean;
-}
-declare var CSS: CSS;
-
-interface CSSConditionRule extends CSSGroupingRule {
-    conditionText: string;
-}
-
-declare var CSSConditionRule: {
-    prototype: CSSConditionRule;
-    new(): CSSConditionRule;
-};
-
-interface CSSFontFaceRule extends CSSRule {
-    readonly style: CSSStyleDeclaration;
-}
-
-declare var CSSFontFaceRule: {
-    prototype: CSSFontFaceRule;
-    new(): CSSFontFaceRule;
-};
-
-interface CSSGroupingRule extends CSSRule {
-    readonly cssRules: CSSRuleList;
-    deleteRule(index: number): void;
-    insertRule(rule: string, index: number): number;
-}
-
-declare var CSSGroupingRule: {
-    prototype: CSSGroupingRule;
-    new(): CSSGroupingRule;
-};
-
-interface CSSImportRule extends CSSRule {
-    readonly href: string;
-    readonly media: MediaList;
-    readonly styleSheet: CSSStyleSheet;
-}
-
-declare var CSSImportRule: {
-    prototype: CSSImportRule;
-    new(): CSSImportRule;
-};
-
-interface CSSKeyframeRule extends CSSRule {
-    keyText: string;
-    readonly style: CSSStyleDeclaration;
-}
-
-declare var CSSKeyframeRule: {
-    prototype: CSSKeyframeRule;
-    new(): CSSKeyframeRule;
-};
-
-interface CSSKeyframesRule extends CSSRule {
-    readonly cssRules: CSSRuleList;
-    name: string;
-    appendRule(rule: string): void;
-    deleteRule(rule: string): void;
-    findRule(rule: string): CSSKeyframeRule | null;
-}
-
-declare var CSSKeyframesRule: {
-    prototype: CSSKeyframesRule;
-    new(): CSSKeyframesRule;
-};
-
-interface CSSMediaRule extends CSSConditionRule {
-    readonly media: MediaList;
-}
-
-declare var CSSMediaRule: {
-    prototype: CSSMediaRule;
-    new(): CSSMediaRule;
-};
-
-interface CSSNamespaceRule extends CSSRule {
-    readonly namespaceURI: string;
-    readonly prefix: string;
-}
-
-declare var CSSNamespaceRule: {
-    prototype: CSSNamespaceRule;
-    new(): CSSNamespaceRule;
-};
-
-interface CSSPageRule extends CSSRule {
-    readonly pseudoClass: string;
-    readonly selector: string;
-    selectorText: string;
-    readonly style: CSSStyleDeclaration;
-}
-
-declare var CSSPageRule: {
-    prototype: CSSPageRule;
-    new(): CSSPageRule;
-};
-
-interface CSSRule {
-    cssText: string;
-    readonly parentRule: CSSRule | null;
-    readonly parentStyleSheet: CSSStyleSheet | null;
-    readonly type: number;
-    readonly CHARSET_RULE: number;
-    readonly FONT_FACE_RULE: number;
-    readonly IMPORT_RULE: number;
-    readonly KEYFRAMES_RULE: number;
-    readonly KEYFRAME_RULE: number;
-    readonly MEDIA_RULE: number;
-    readonly NAMESPACE_RULE: number;
-    readonly PAGE_RULE: number;
-    readonly STYLE_RULE: number;
-    readonly SUPPORTS_RULE: number;
-    readonly UNKNOWN_RULE: number;
-    readonly VIEWPORT_RULE: number;
-}
-
-declare var CSSRule: {
-    prototype: CSSRule;
-    new(): CSSRule;
-    readonly CHARSET_RULE: number;
-    readonly FONT_FACE_RULE: number;
-    readonly IMPORT_RULE: number;
-    readonly KEYFRAMES_RULE: number;
-    readonly KEYFRAME_RULE: number;
-    readonly MEDIA_RULE: number;
-    readonly NAMESPACE_RULE: number;
-    readonly PAGE_RULE: number;
-    readonly STYLE_RULE: number;
-    readonly SUPPORTS_RULE: number;
-    readonly UNKNOWN_RULE: number;
-    readonly VIEWPORT_RULE: number;
-};
-
-interface CSSRuleList {
-    readonly length: number;
-    item(index: number): CSSRule | null;
-    [index: number]: CSSRule;
-}
-
-declare var CSSRuleList: {
-    prototype: CSSRuleList;
-    new(): CSSRuleList;
-};
-
-interface CSSStyleDeclaration {
-    alignContent: string | null;
-    alignItems: string | null;
-    alignSelf: string | null;
-    alignmentBaseline: string | null;
-    animation: string | null;
-    animationDelay: string | null;
-    animationDirection: string | null;
-    animationDuration: string | null;
-    animationFillMode: string | null;
-    animationIterationCount: string | null;
-    animationName: string | null;
-    animationPlayState: string | null;
-    animationTimingFunction: string | null;
-    backfaceVisibility: string | null;
-    background: string | null;
-    backgroundAttachment: string | null;
-    backgroundClip: string | null;
-    backgroundColor: string | null;
-    backgroundImage: string | null;
-    backgroundOrigin: string | null;
-    backgroundPosition: string | null;
-    backgroundPositionX: string | null;
-    backgroundPositionY: string | null;
-    backgroundRepeat: string | null;
-    backgroundSize: string | null;
-    baselineShift: string | null;
-    border: string | null;
-    borderBottom: string | null;
-    borderBottomColor: string | null;
-    borderBottomLeftRadius: string | null;
-    borderBottomRightRadius: string | null;
-    borderBottomStyle: string | null;
-    borderBottomWidth: string | null;
-    borderCollapse: string | null;
-    borderColor: string | null;
-    borderImage: string | null;
-    borderImageOutset: string | null;
-    borderImageRepeat: string | null;
-    borderImageSlice: string | null;
-    borderImageSource: string | null;
-    borderImageWidth: string | null;
-    borderLeft: string | null;
-    borderLeftColor: string | null;
-    borderLeftStyle: string | null;
-    borderLeftWidth: string | null;
-    borderRadius: string | null;
-    borderRight: string | null;
-    borderRightColor: string | null;
-    borderRightStyle: string | null;
-    borderRightWidth: string | null;
-    borderSpacing: string | null;
-    borderStyle: string | null;
-    borderTop: string | null;
-    borderTopColor: string | null;
-    borderTopLeftRadius: string | null;
-    borderTopRightRadius: string | null;
-    borderTopStyle: string | null;
-    borderTopWidth: string | null;
-    borderWidth: string | null;
-    bottom: string | null;
-    boxShadow: string | null;
-    boxSizing: string | null;
-    breakAfter: string | null;
-    breakBefore: string | null;
-    breakInside: string | null;
-    captionSide: string | null;
-    clear: string | null;
-    clip: string | null;
-    clipPath: string | null;
-    clipRule: string | null;
-    color: string | null;
-    colorInterpolationFilters: string | null;
-    columnCount: any;
-    columnFill: string | null;
-    columnGap: any;
-    columnRule: string | null;
-    columnRuleColor: any;
-    columnRuleStyle: string | null;
-    columnRuleWidth: any;
-    columnSpan: string | null;
-    columnWidth: any;
-    columns: string | null;
-    content: string | null;
-    counterIncrement: string | null;
-    counterReset: string | null;
-    cssFloat: string | null;
-    cssText: string;
-    cursor: string | null;
-    direction: string | null;
-    display: string | null;
-    dominantBaseline: string | null;
-    emptyCells: string | null;
-    enableBackground: string | null;
-    fill: string | null;
-    fillOpacity: string | null;
-    fillRule: string | null;
-    filter: string | null;
-    flex: string | null;
-    flexBasis: string | null;
-    flexDirection: string | null;
-    flexFlow: string | null;
-    flexGrow: string | null;
-    flexShrink: string | null;
-    flexWrap: string | null;
-    floodColor: string | null;
-    floodOpacity: string | null;
-    font: string | null;
-    fontFamily: string | null;
-    fontFeatureSettings: string | null;
-    fontSize: string | null;
-    fontSizeAdjust: string | null;
-    fontStretch: string | null;
-    fontStyle: string | null;
-    fontVariant: string | null;
-    fontWeight: string | null;
-    gap: string | null;
-    glyphOrientationHorizontal: string | null;
-    glyphOrientationVertical: string | null;
-    grid: string | null;
-    gridArea: string | null;
-    gridAutoColumns: string | null;
-    gridAutoFlow: string | null;
-    gridAutoRows: string | null;
-    gridColumn: string | null;
-    gridColumnEnd: string | null;
-    gridColumnGap: string | null;
-    gridColumnStart: string | null;
-    gridGap: string | null;
-    gridRow: string | null;
-    gridRowEnd: string | null;
-    gridRowGap: string | null;
-    gridRowStart: string | null;
-    gridTemplate: string | null;
-    gridTemplateAreas: string | null;
-    gridTemplateColumns: string | null;
-    gridTemplateRows: string | null;
-    height: string | null;
-    imeMode: string | null;
-    justifyContent: string | null;
-    justifyItems: string | null;
-    justifySelf: string | null;
-    kerning: string | null;
-    layoutGrid: string | null;
-    layoutGridChar: string | null;
-    layoutGridLine: string | null;
-    layoutGridMode: string | null;
-    layoutGridType: string | null;
-    left: string | null;
-    readonly length: number;
-    letterSpacing: string | null;
-    lightingColor: string | null;
-    lineBreak: string | null;
-    lineHeight: string | null;
-    listStyle: string | null;
-    listStyleImage: string | null;
-    listStylePosition: string | null;
-    listStyleType: string | null;
-    margin: string | null;
-    marginBottom: string | null;
-    marginLeft: string | null;
-    marginRight: string | null;
-    marginTop: string | null;
-    marker: string | null;
-    markerEnd: string | null;
-    markerMid: string | null;
-    markerStart: string | null;
-    mask: string | null;
-    maskImage: string | null;
-    maxHeight: string | null;
-    maxWidth: string | null;
-    minHeight: string | null;
-    minWidth: string | null;
-    msContentZoomChaining: string | null;
-    msContentZoomLimit: string | null;
-    msContentZoomLimitMax: any;
-    msContentZoomLimitMin: any;
-    msContentZoomSnap: string | null;
-    msContentZoomSnapPoints: string | null;
-    msContentZoomSnapType: string | null;
-    msContentZooming: string | null;
-    msFlowFrom: string | null;
-    msFlowInto: string | null;
-    msFontFeatureSettings: string | null;
-    msGridColumn: any;
-    msGridColumnAlign: string | null;
-    msGridColumnSpan: any;
-    msGridColumns: string | null;
-    msGridRow: any;
-    msGridRowAlign: string | null;
-    msGridRowSpan: any;
-    msGridRows: string | null;
-    msHighContrastAdjust: string | null;
-    msHyphenateLimitChars: string | null;
-    msHyphenateLimitLines: any;
-    msHyphenateLimitZone: any;
-    msHyphens: string | null;
-    msImeAlign: string | null;
-    msOverflowStyle: string | null;
-    msScrollChaining: string | null;
-    msScrollLimit: string | null;
-    msScrollLimitXMax: any;
-    msScrollLimitXMin: any;
-    msScrollLimitYMax: any;
-    msScrollLimitYMin: any;
-    msScrollRails: string | null;
-    msScrollSnapPointsX: string | null;
-    msScrollSnapPointsY: string | null;
-    msScrollSnapType: string | null;
-    msScrollSnapX: string | null;
-    msScrollSnapY: string | null;
-    msScrollTranslation: string | null;
-    msTextCombineHorizontal: string | null;
-    msTextSizeAdjust: any;
-    msTouchAction: string | null;
-    msTouchSelect: string | null;
-    msUserSelect: string | null;
-    msWrapFlow: string;
-    msWrapMargin: any;
-    msWrapThrough: string;
-    objectFit: string | null;
-    objectPosition: string | null;
-    opacity: string | null;
-    order: string | null;
-    orphans: string | null;
-    outline: string | null;
-    outlineColor: string | null;
-    outlineOffset: string | null;
-    outlineStyle: string | null;
-    outlineWidth: string | null;
-    overflow: string | null;
-    overflowX: string | null;
-    overflowY: string | null;
-    padding: string | null;
-    paddingBottom: string | null;
-    paddingLeft: string | null;
-    paddingRight: string | null;
-    paddingTop: string | null;
-    pageBreakAfter: string | null;
-    pageBreakBefore: string | null;
-    pageBreakInside: string | null;
-    readonly parentRule: CSSRule;
-    penAction: string | null;
-    perspective: string | null;
-    perspectiveOrigin: string | null;
-    pointerEvents: string | null;
-    position: string | null;
-    quotes: string | null;
-    resize: string | null;
-    right: string | null;
-    rotate: string | null;
-    rowGap: string | null;
-    rubyAlign: string | null;
-    rubyOverhang: string | null;
-    rubyPosition: string | null;
-    scale: string | null;
-    stopColor: string | null;
-    stopOpacity: string | null;
-    stroke: string | null;
-    strokeDasharray: string | null;
-    strokeDashoffset: string | null;
-    strokeLinecap: string | null;
-    strokeLinejoin: string | null;
-    strokeMiterlimit: string | null;
-    strokeOpacity: string | null;
-    strokeWidth: string | null;
-    tableLayout: string | null;
-    textAlign: string | null;
-    textAlignLast: string | null;
-    textAnchor: string | null;
-    textCombineUpright: string | null;
-    textDecoration: string | null;
-    textIndent: string | null;
-    textJustify: string | null;
-    textKashida: string | null;
-    textKashidaSpace: string | null;
-    textOverflow: string | null;
-    textShadow: string | null;
-    textTransform: string | null;
-    textUnderlinePosition: string | null;
-    top: string | null;
-    touchAction: string | null;
-    transform: string | null;
-    transformOrigin: string | null;
-    transformStyle: string | null;
-    transition: string | null;
-    transitionDelay: string | null;
-    transitionDuration: string | null;
-    transitionProperty: string | null;
-    transitionTimingFunction: string | null;
-    translate: string | null;
-    unicodeBidi: string | null;
-    userSelect: string | null;
-    verticalAlign: string | null;
-    visibility: string | null;
-    webkitAlignContent: string | null;
-    webkitAlignItems: string | null;
-    webkitAlignSelf: string | null;
-    webkitAnimation: string | null;
-    webkitAnimationDelay: string | null;
-    webkitAnimationDirection: string | null;
-    webkitAnimationDuration: string | null;
-    webkitAnimationFillMode: string | null;
-    webkitAnimationIterationCount: string | null;
-    webkitAnimationName: string | null;
-    webkitAnimationPlayState: string | null;
-    webkitAnimationTimingFunction: string | null;
-    webkitAppearance: string | null;
-    webkitBackfaceVisibility: string | null;
-    webkitBackgroundClip: string | null;
-    webkitBackgroundOrigin: string | null;
-    webkitBackgroundSize: string | null;
-    webkitBorderBottomLeftRadius: string | null;
-    webkitBorderBottomRightRadius: string | null;
-    webkitBorderImage: string | null;
-    webkitBorderRadius: string | null;
-    webkitBorderTopLeftRadius: string | null;
-    webkitBorderTopRightRadius: string | null;
-    webkitBoxAlign: string | null;
-    webkitBoxDirection: string | null;
-    webkitBoxFlex: string | null;
-    webkitBoxOrdinalGroup: string | null;
-    webkitBoxOrient: string | null;
-    webkitBoxPack: string | null;
-    webkitBoxSizing: string | null;
-    webkitColumnBreakAfter: string | null;
-    webkitColumnBreakBefore: string | null;
-    webkitColumnBreakInside: string | null;
-    webkitColumnCount: any;
-    webkitColumnGap: any;
-    webkitColumnRule: string | null;
-    webkitColumnRuleColor: any;
-    webkitColumnRuleStyle: string | null;
-    webkitColumnRuleWidth: any;
-    webkitColumnSpan: string | null;
-    webkitColumnWidth: any;
-    webkitColumns: string | null;
-    webkitFilter: string | null;
-    webkitFlex: string | null;
-    webkitFlexBasis: string | null;
-    webkitFlexDirection: string | null;
-    webkitFlexFlow: string | null;
-    webkitFlexGrow: string | null;
-    webkitFlexShrink: string | null;
-    webkitFlexWrap: string | null;
-    webkitJustifyContent: string | null;
-    webkitOrder: string | null;
-    webkitPerspective: string | null;
-    webkitPerspectiveOrigin: string | null;
-    webkitTapHighlightColor: string | null;
-    webkitTextFillColor: string | null;
-    webkitTextSizeAdjust: any;
-    webkitTextStroke: string | null;
-    webkitTextStrokeColor: string | null;
-    webkitTextStrokeWidth: string | null;
-    webkitTransform: string | null;
-    webkitTransformOrigin: string | null;
-    webkitTransformStyle: string | null;
-    webkitTransition: string | null;
-    webkitTransitionDelay: string | null;
-    webkitTransitionDuration: string | null;
-    webkitTransitionProperty: string | null;
-    webkitTransitionTimingFunction: string | null;
-    webkitUserModify: string | null;
-    webkitUserSelect: string | null;
-    webkitWritingMode: string | null;
-    whiteSpace: string | null;
-    widows: string | null;
-    width: string | null;
-    wordBreak: string | null;
-    wordSpacing: string | null;
-    wordWrap: string | null;
-    writingMode: string | null;
-    zIndex: string | null;
-    zoom: string | null;
-    getPropertyPriority(propertyName: string): string;
-    getPropertyValue(propertyName: string): string;
-    item(index: number): string;
-    removeProperty(propertyName: string): string;
-    setProperty(propertyName: string, value: string | null, priority?: string | null): void;
-    [index: number]: string;
-}
-
-declare var CSSStyleDeclaration: {
-    prototype: CSSStyleDeclaration;
-    new(): CSSStyleDeclaration;
-};
-
-interface CSSStyleRule extends CSSRule {
-    selectorText: string;
-    readonly style: CSSStyleDeclaration;
-}
-
-declare var CSSStyleRule: {
-    prototype: CSSStyleRule;
-    new(): CSSStyleRule;
-};
-
-interface CSSStyleSheet extends StyleSheet {
-    readonly cssRules: CSSRuleList;
-    /** @deprecated */
-    cssText: string;
-    /** @deprecated */
-    readonly id: string;
-    /** @deprecated */
-    readonly imports: StyleSheetList;
-    /** @deprecated */
-    readonly isAlternate: boolean;
-    /** @deprecated */
-    readonly isPrefAlternate: boolean;
-    readonly ownerRule: CSSRule | null;
-    /** @deprecated */
-    readonly owningElement: Element;
-    /** @deprecated */
-    readonly pages: any;
-    /** @deprecated */
-    readonly readOnly: boolean;
-    readonly rules: CSSRuleList;
-    /** @deprecated */
-    addImport(bstrURL: string, lIndex?: number): number;
-    /** @deprecated */
-    addPageRule(bstrSelector: string, bstrStyle: string, lIndex?: number): number;
-    addRule(bstrSelector: string, bstrStyle?: string, lIndex?: number): number;
-    deleteRule(index?: number): void;
-    insertRule(rule: string, index?: number): number;
-    /** @deprecated */
-    removeImport(lIndex: number): void;
-    removeRule(lIndex: number): void;
-}
-
-declare var CSSStyleSheet: {
-    prototype: CSSStyleSheet;
-    new(): CSSStyleSheet;
-};
-
-interface CSSSupportsRule extends CSSConditionRule {
-}
-
-declare var CSSSupportsRule: {
-    prototype: CSSSupportsRule;
-    new(): CSSSupportsRule;
-};
-
-interface Cache {
-    add(request: Request | string): Promise<void>;
-    addAll(requests: (Request | string)[]): Promise<void>;
-    delete(request: Request | string, options?: CacheQueryOptions): Promise<boolean>;
-    keys(request?: Request | string, options?: CacheQueryOptions): Promise<Request[]>;
-    match(request: Request | string, options?: CacheQueryOptions): Promise<Response>;
-    matchAll(request?: Request | string, options?: CacheQueryOptions): Promise<Response[]>;
-    put(request: Request | string, response: Response): Promise<void>;
-}
-
-declare var Cache: {
-    prototype: Cache;
-    new(): Cache;
-};
-
-interface CacheStorage {
-    delete(cacheName: string): Promise<boolean>;
-    has(cacheName: string): Promise<boolean>;
-    keys(): Promise<string[]>;
-    match(request: Request | string, options?: CacheQueryOptions): Promise<any>;
-    open(cacheName: string): Promise<Cache>;
-}
-
-declare var CacheStorage: {
-    prototype: CacheStorage;
-    new(): CacheStorage;
-};
-
-interface Canvas2DContextAttributes {
-    alpha?: boolean;
-    storage?: boolean;
-    willReadFrequently?: boolean;
-    [attribute: string]: boolean | string | undefined;
-}
-
-interface CanvasGradient {
-    addColorStop(offset: number, color: string): void;
-}
-
-declare var CanvasGradient: {
-    prototype: CanvasGradient;
-    new(): CanvasGradient;
-};
-
-interface CanvasPathMethods {
-    arc(x: number, y: number, radius: number, startAngle: number, endAngle: number, anticlockwise?: boolean): void;
-    arcTo(x1: number, y1: number, x2: number, y2: number, radius: number): void;
-    arcTo(x1: number, y1: number, x2: number, y2: number, radiusX: number, radiusY: number, rotation: number): void;
-    bezierCurveTo(cp1x: number, cp1y: number, cp2x: number, cp2y: number, x: number, y: number): void;
-    closePath(): void;
-    ellipse(x: number, y: number, radiusX: number, radiusY: number, rotation: number, startAngle: number, endAngle: number, anticlockwise?: boolean): void;
-    lineTo(x: number, y: number): void;
-    moveTo(x: number, y: number): void;
-    quadraticCurveTo(cpx: number, cpy: number, x: number, y: number): void;
-    rect(x: number, y: number, w: number, h: number): void;
-}
-
-interface CanvasPattern {
-    setTransform(matrix: SVGMatrix): void;
-}
-
-declare var CanvasPattern: {
-    prototype: CanvasPattern;
-    new(): CanvasPattern;
-};
-
-interface CanvasRenderingContext2D extends CanvasPathMethods {
-    readonly canvas: HTMLCanvasElement;
-    fillStyle: string | CanvasGradient | CanvasPattern;
-    font: string;
-    globalAlpha: number;
-    globalCompositeOperation: string;
-    imageSmoothingEnabled: boolean;
-    lineCap: string;
-    lineDashOffset: number;
-    lineJoin: string;
-    lineWidth: number;
-    miterLimit: number;
-    mozImageSmoothingEnabled: boolean;
-    msFillRule: CanvasFillRule;
-    oImageSmoothingEnabled: boolean;
-    shadowBlur: number;
-    shadowColor: string;
-    shadowOffsetX: number;
-    shadowOffsetY: number;
-    strokeStyle: string | CanvasGradient | CanvasPattern;
-    textAlign: string;
-    textBaseline: string;
-    webkitImageSmoothingEnabled: boolean;
-    beginPath(): void;
-    clearRect(x: number, y: number, w: number, h: number): void;
-    clip(fillRule?: CanvasFillRule): void;
-    clip(path: Path2D, fillRule?: CanvasFillRule): void;
-    createImageData(imageDataOrSw: number | ImageData, sh?: number): ImageData;
-    createLinearGradient(x0: number, y0: number, x1: number, y1: number): CanvasGradient;
-    createPattern(image: HTMLImageElement | HTMLCanvasElement | HTMLVideoElement, repetition: string): CanvasPattern;
-    createRadialGradient(x0: number, y0: number, r0: number, x1: number, y1: number, r1: number): CanvasGradient;
-    drawFocusIfNeeded(element: Element): void;
-    drawFocusIfNeeded(path: Path2D, element: Element): void;
-    drawImage(image: HTMLImageElement | HTMLCanvasElement | HTMLVideoElement | ImageBitmap, dstX: number, dstY: number): void;
-    drawImage(image: HTMLImageElement | HTMLCanvasElement | HTMLVideoElement | ImageBitmap, dstX: number, dstY: number, dstW: number, dstH: number): void;
-    drawImage(image: HTMLImageElement | HTMLCanvasElement | HTMLVideoElement | ImageBitmap, srcX: number, srcY: number, srcW: number, srcH: number, dstX: number, dstY: number, dstW: number, dstH: number): void;
-    fill(fillRule?: CanvasFillRule): void;
-    fill(path: Path2D, fillRule?: CanvasFillRule): void;
-    fillRect(x: number, y: number, w: number, h: number): void;
-    fillText(text: string, x: number, y: number, maxWidth?: number): void;
-    getImageData(sx: number, sy: number, sw: number, sh: number): ImageData;
-    getLineDash(): number[];
-    isPointInPath(x: number, y: number, fillRule?: CanvasFillRule): boolean;
-    isPointInPath(path: Path2D, x: number, y: number, fillRule?: CanvasFillRule): boolean;
-    isPointInStroke(x: number, y: number, fillRule?: CanvasFillRule): boolean;
-    isPointInStroke(path: Path2D, x: number, y: number, fillRule?: CanvasFillRule): boolean;
-    measureText(text: string): TextMetrics;
-    putImageData(imagedata: ImageData, dx: number, dy: number, dirtyX?: number, dirtyY?: number, dirtyWidth?: number, dirtyHeight?: number): void;
-    restore(): void;
-    rotate(angle: number): void;
-    save(): void;
-    scale(x: number, y: number): void;
-    setLineDash(segments: number[]): void;
-    setTransform(m11: number, m12: number, m21: number, m22: number, dx: number, dy: number): void;
-    stroke(path?: Path2D): void;
-    strokeRect(x: number, y: number, w: number, h: number): void;
-    strokeText(text: string, x: number, y: number, maxWidth?: number): void;
-    transform(m11: number, m12: number, m21: number, m22: number, dx: number, dy: number): void;
-    translate(x: number, y: number): void;
-}
-
-declare var CanvasRenderingContext2D: {
-    prototype: CanvasRenderingContext2D;
-    new(): CanvasRenderingContext2D;
-};
-
-interface ChannelMergerNode extends AudioNode {
-}
-
-declare var ChannelMergerNode: {
-    prototype: ChannelMergerNode;
-    new(): ChannelMergerNode;
-};
-
-interface ChannelSplitterNode extends AudioNode {
-}
-
-declare var ChannelSplitterNode: {
-    prototype: ChannelSplitterNode;
-    new(): ChannelSplitterNode;
-};
-
-interface CharacterData extends Node, ChildNode {
-    data: string;
-    readonly length: number;
-    appendData(arg: string): void;
-    deleteData(offset: number, count: number): void;
-    insertData(offset: number, arg: string): void;
-    replaceData(offset: number, count: number, arg: string): void;
-    substringData(offset: number, count: number): string;
-}
-
-declare var CharacterData: {
-    prototype: CharacterData;
-    new(): CharacterData;
-};
-
-interface ChildNode {
-    remove(): void;
-}
-
-interface ClientRect {
-    bottom: number;
-    readonly height: number;
-    left: number;
-    right: number;
-    top: number;
-    readonly width: number;
-}
-
-declare var ClientRect: {
-    prototype: ClientRect;
-    new(): ClientRect;
-};
-
-interface ClientRectList {
-    readonly length: number;
-    item(index: number): ClientRect;
-    [index: number]: ClientRect;
-}
-
-declare var ClientRectList: {
-    prototype: ClientRectList;
-    new(): ClientRectList;
-};
-
-interface ClipboardEvent extends Event {
-    readonly clipboardData: DataTransfer;
-}
-
-declare var ClipboardEvent: {
-    prototype: ClipboardEvent;
-    new(type: string, eventInitDict?: ClipboardEventInit): ClipboardEvent;
-};
-
-interface ClipboardEventInit extends EventInit {
-    data?: string;
-    dataType?: string;
-}
-
-interface CloseEvent extends Event {
-    readonly code: number;
-    readonly reason: string;
-    readonly wasClean: boolean;
-    /** @deprecated */
-    initCloseEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, wasCleanArg: boolean, codeArg: number, reasonArg: string): void;
-}
-
-declare var CloseEvent: {
-    prototype: CloseEvent;
-    new(type: string, eventInitDict?: CloseEventInit): CloseEvent;
-};
-
-interface Comment extends CharacterData {
-    text: string;
-}
-
-declare var Comment: {
-    prototype: Comment;
-    new(data?: string): Comment;
-};
-
-interface CompositionEvent extends UIEvent {
-    readonly data: string;
-    readonly locale: string;
-    initCompositionEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, dataArg: string, locale: string): void;
-}
-
-declare var CompositionEvent: {
-    prototype: CompositionEvent;
-    new(typeArg: string, eventInitDict?: CompositionEventInit): CompositionEvent;
-};
-
-interface ComputedTimingProperties {
-    activeDuration: number;
-    currentIteration: number | null;
-    endTime: number;
-    localTime: number | null;
-    progress: number | null;
-}
-
-interface ConcatParams extends Algorithm {
-    algorithmId: Uint8Array;
-    hash?: string | Algorithm;
-    partyUInfo: Uint8Array;
-    partyVInfo: Uint8Array;
-    privateInfo?: Uint8Array;
-    publicInfo?: Uint8Array;
-}
-
-interface Console {
-    memory: any;
-    assert(condition?: boolean, message?: string, ...data: any[]): void;
-    clear(): void;
-    count(label?: string): void;
-    debug(message?: any, ...optionalParams: any[]): void;
-    dir(value?: any, ...optionalParams: any[]): void;
-    dirxml(value: any): void;
-    error(message?: any, ...optionalParams: any[]): void;
-    exception(message?: string, ...optionalParams: any[]): void;
-    group(groupTitle?: string, ...optionalParams: any[]): void;
-    groupCollapsed(groupTitle?: string, ...optionalParams: any[]): void;
-    groupEnd(): void;
-    info(message?: any, ...optionalParams: any[]): void;
-    log(message?: any, ...optionalParams: any[]): void;
-    markTimeline(label?: string): void;
-    msIsIndependentlyComposed(element: Element): boolean;
-    profile(reportName?: string): void;
-    profileEnd(): void;
-    select(element: Element): void;
-    table(...tabularData: any[]): void;
-    time(label?: string): void;
-    timeEnd(label?: string): void;
-    timeStamp(label?: string): void;
-    timeline(label?: string): void;
-    timelineEnd(label?: string): void;
-    trace(message?: any, ...optionalParams: any[]): void;
-    warn(message?: any, ...optionalParams: any[]): void;
-}
-
-declare var Console: {
-    prototype: Console;
-    new(): Console;
-};
-
-interface ContentScriptGlobalScope extends EventTarget {
-    readonly msContentScript: ExtensionScriptApis;
-    readonly window: Window;
-}
-
-declare var ContentScriptGlobalScope: {
-    prototype: ContentScriptGlobalScope;
-    new(): ContentScriptGlobalScope;
-};
-
-interface ConvolverNode extends AudioNode {
-    buffer: AudioBuffer | null;
-    normalize: boolean;
-}
-
-declare var ConvolverNode: {
-    prototype: ConvolverNode;
-    new(): ConvolverNode;
-};
-
-interface Coordinates {
-    readonly accuracy: number;
-    readonly altitude: number | null;
-    readonly altitudeAccuracy: number | null;
-    readonly heading: number | null;
-    readonly latitude: number;
-    readonly longitude: number;
-    readonly speed: number | null;
-}
-
-declare var Coordinates: {
-    prototype: Coordinates;
-    new(): Coordinates;
-};
-
-interface CountQueuingStrategy {
-    highWaterMark: number;
-    size(): number;
-}
-
-declare var CountQueuingStrategy: {
-    prototype: CountQueuingStrategy;
-    new(strategy: QueuingStrategy): CountQueuingStrategy;
-};
-
-interface Crypto {
-    readonly subtle: SubtleCrypto;
-    getRandomValues(array: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | null): Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | null;
-}
-
-declare var Crypto: {
-    prototype: Crypto;
-    new(): Crypto;
-};
-
-interface CryptoKey {
-    readonly algorithm: KeyAlgorithm;
-    readonly extractable: boolean;
-    readonly type: string;
-    readonly usages: string[];
-}
-
-declare var CryptoKey: {
-    prototype: CryptoKey;
-    new(): CryptoKey;
-};
-
-interface CryptoKeyPair {
-    privateKey: CryptoKey;
-    publicKey: CryptoKey;
-}
-
-declare var CryptoKeyPair: {
-    prototype: CryptoKeyPair;
-    new(): CryptoKeyPair;
-};
-
-interface CustomElementRegistry {
-    define(name: string, constructor: Function, options?: ElementDefinitionOptions): void;
-    get(name: string): any;
-    whenDefined(name: string): PromiseLike<void>;
-}
-
-interface CustomEvent<T = any> extends Event {
-    readonly detail: T;
-    initCustomEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, detailArg: T): void;
-}
-
-declare var CustomEvent: {
-    prototype: CustomEvent;
-    new<T>(typeArg: string, eventInitDict?: CustomEventInit<T>): CustomEvent<T>;
-};
-
-interface DOMError {
-    readonly name: string;
-    toString(): string;
-}
-
-declare var DOMError: {
-    prototype: DOMError;
-    new(): DOMError;
-};
-
-interface DOMException {
-    readonly code: number;
-    readonly message: string;
-    readonly name: string;
-    toString(): string;
-    readonly ABORT_ERR: number;
-    readonly DATA_CLONE_ERR: number;
-    readonly DOMSTRING_SIZE_ERR: number;
-    readonly HIERARCHY_REQUEST_ERR: number;
-    readonly INDEX_SIZE_ERR: number;
-    readonly INUSE_ATTRIBUTE_ERR: number;
-    readonly INVALID_ACCESS_ERR: number;
-    readonly INVALID_CHARACTER_ERR: number;
-    readonly INVALID_MODIFICATION_ERR: number;
-    readonly INVALID_NODE_TYPE_ERR: number;
-    readonly INVALID_STATE_ERR: number;
-    readonly NAMESPACE_ERR: number;
-    readonly NETWORK_ERR: number;
-    readonly NOT_FOUND_ERR: number;
-    readonly NOT_SUPPORTED_ERR: number;
-    readonly NO_DATA_ALLOWED_ERR: number;
-    readonly NO_MODIFICATION_ALLOWED_ERR: number;
-    readonly PARSE_ERR: number;
-    readonly QUOTA_EXCEEDED_ERR: number;
-    readonly SECURITY_ERR: number;
-    readonly SERIALIZE_ERR: number;
-    readonly SYNTAX_ERR: number;
-    readonly TIMEOUT_ERR: number;
-    readonly TYPE_MISMATCH_ERR: number;
-    readonly URL_MISMATCH_ERR: number;
-    readonly VALIDATION_ERR: number;
-    readonly WRONG_DOCUMENT_ERR: number;
-}
-
-declare var DOMException: {
-    prototype: DOMException;
-    new(message?: string, name?: string): DOMException;
-    readonly ABORT_ERR: number;
-    readonly DATA_CLONE_ERR: number;
-    readonly DOMSTRING_SIZE_ERR: number;
-    readonly HIERARCHY_REQUEST_ERR: number;
-    readonly INDEX_SIZE_ERR: number;
-    readonly INUSE_ATTRIBUTE_ERR: number;
-    readonly INVALID_ACCESS_ERR: number;
-    readonly INVALID_CHARACTER_ERR: number;
-    readonly INVALID_MODIFICATION_ERR: number;
-    readonly INVALID_NODE_TYPE_ERR: number;
-    readonly INVALID_STATE_ERR: number;
-    readonly NAMESPACE_ERR: number;
-    readonly NETWORK_ERR: number;
-    readonly NOT_FOUND_ERR: number;
-    readonly NOT_SUPPORTED_ERR: number;
-    readonly NO_DATA_ALLOWED_ERR: number;
-    readonly NO_MODIFICATION_ALLOWED_ERR: number;
-    readonly PARSE_ERR: number;
-    readonly QUOTA_EXCEEDED_ERR: number;
-    readonly SECURITY_ERR: number;
-    readonly SERIALIZE_ERR: number;
-    readonly SYNTAX_ERR: number;
-    readonly TIMEOUT_ERR: number;
-    readonly TYPE_MISMATCH_ERR: number;
-    readonly URL_MISMATCH_ERR: number;
-    readonly VALIDATION_ERR: number;
-    readonly WRONG_DOCUMENT_ERR: number;
-};
-
-interface DOMImplementation {
-    createDocument(namespaceURI: string | null, qualifiedName: string | null, doctype: DocumentType | null): Document;
-    createDocumentType(qualifiedName: string, publicId: string, systemId: string): DocumentType;
-    createHTMLDocument(title?: string): Document;
-    hasFeature(feature: string | null, version: string | null): boolean;
-}
-
-declare var DOMImplementation: {
-    prototype: DOMImplementation;
-    new(): DOMImplementation;
-};
-
-interface DOML2DeprecatedColorProperty {
-    color: string;
-}
-
-interface DOML2DeprecatedSizeProperty {
-    size: number;
-}
-
-interface DOMParser {
-    parseFromString(source: string, mimeType: string): Document;
-}
-
-declare var DOMParser: {
-    prototype: DOMParser;
-    new(): DOMParser;
-};
-
-interface DOMRect extends DOMRectReadOnly {
-    height: number;
-    width: number;
-    x: number;
-    y: number;
-}
-
-declare var DOMRect: {
-    prototype: DOMRect;
-    new (x?: number, y?: number, width?: number, height?: number): DOMRect;
-    fromRect(rectangle?: DOMRectInit): DOMRect;
-};
-
-interface DOMRectList {
-    readonly length: number;
-    item(index: number): DOMRect | null;
-    [index: number]: DOMRect;
-}
-
-interface DOMRectReadOnly {
-    readonly bottom: number;
-    readonly height: number;
-    readonly left: number;
-    readonly right: number;
-    readonly top: number;
-    readonly width: number;
-    readonly x: number;
-    readonly y: number;
-}
-
-declare var DOMRectReadOnly: {
-    prototype: DOMRectReadOnly;
-    new (x?: number, y?: number, width?: number, height?: number): DOMRectReadOnly;
-    fromRect(rectangle?: DOMRectInit): DOMRectReadOnly;
-};
-
-interface DOMSettableTokenList extends DOMTokenList {
-    value: string;
-}
-
-declare var DOMSettableTokenList: {
-    prototype: DOMSettableTokenList;
-    new(): DOMSettableTokenList;
-};
-
-interface DOMStringList {
-    readonly length: number;
-    contains(str: string): boolean;
-    item(index: number): string | null;
-    [index: number]: string;
-}
-
-declare var DOMStringList: {
-    prototype: DOMStringList;
-    new(): DOMStringList;
-};
-
-interface DOMStringMap {
-    [name: string]: string | undefined;
-}
-
-declare var DOMStringMap: {
-    prototype: DOMStringMap;
-    new(): DOMStringMap;
-};
-
-interface DOMTokenList {
-    readonly length: number;
-    add(...tokens: string[]): void;
-    contains(token: string): boolean;
-    item(index: number): string | null;
-    remove(...tokens: string[]): void;
-    replace(oldToken: string, newToken: string): void;
-    toString(): string;
-    toggle(token: string, force?: boolean): boolean;
-    [index: number]: string;
-}
-
-declare var DOMTokenList: {
-    prototype: DOMTokenList;
-    new(): DOMTokenList;
-};
-
-interface DataCue extends TextTrackCue {
-    data: ArrayBuffer;
-    addEventListener<K extends keyof TextTrackCueEventMap>(type: K, listener: (this: DataCue, ev: TextTrackCueEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof TextTrackCueEventMap>(type: K, listener: (this: DataCue, ev: TextTrackCueEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var DataCue: {
-    prototype: DataCue;
-    new(): DataCue;
-};
-
-interface DataTransfer {
-    dropEffect: string;
-    effectAllowed: string;
-    readonly files: FileList;
-    readonly items: DataTransferItemList;
-    readonly types: string[];
-    clearData(format?: string): boolean;
-    getData(format: string): string;
-    setData(format: string, data: string): boolean;
-    setDragImage(image: Element, x: number, y: number): void;
-}
-
-declare var DataTransfer: {
-    prototype: DataTransfer;
-    new(): DataTransfer;
-};
-
-interface DataTransferItem {
-    readonly kind: string;
-    readonly type: string;
-    getAsFile(): File | null;
-    getAsString(_callback: FunctionStringCallback | null): void;
-    webkitGetAsEntry(): any;
-}
-
-declare var DataTransferItem: {
-    prototype: DataTransferItem;
-    new(): DataTransferItem;
-};
-
-interface DataTransferItemList {
-    readonly length: number;
-    add(data: File): DataTransferItem | null;
-    add(data: string, type: string): DataTransferItem | null;
-    clear(): void;
-    item(index: number): DataTransferItem;
-    remove(index: number): void;
-    [name: number]: DataTransferItem;
-}
-
-declare var DataTransferItemList: {
-    prototype: DataTransferItemList;
-    new(): DataTransferItemList;
-};
-
-interface DeferredPermissionRequest {
-    readonly id: number;
-    readonly type: MSWebViewPermissionType;
-    readonly uri: string;
-    allow(): void;
-    deny(): void;
-}
-
-declare var DeferredPermissionRequest: {
-    prototype: DeferredPermissionRequest;
-    new(): DeferredPermissionRequest;
-};
-
-interface DelayNode extends AudioNode {
-    readonly delayTime: AudioParam;
-}
-
-declare var DelayNode: {
-    prototype: DelayNode;
-    new(): DelayNode;
-};
-
-interface DeviceAcceleration {
-    readonly x: number | null;
-    readonly y: number | null;
-    readonly z: number | null;
-}
-
-declare var DeviceAcceleration: {
-    prototype: DeviceAcceleration;
-    new(): DeviceAcceleration;
-};
-
-interface DeviceLightEvent extends Event {
-    readonly value: number;
-}
-
-declare var DeviceLightEvent: {
-    prototype: DeviceLightEvent;
-    new(typeArg: string, eventInitDict?: DeviceLightEventInit): DeviceLightEvent;
-};
-
-interface DeviceMotionEvent extends Event {
-    readonly acceleration: DeviceAcceleration | null;
-    readonly accelerationIncludingGravity: DeviceAcceleration | null;
-    readonly interval: number | null;
-    readonly rotationRate: DeviceRotationRate | null;
-    initDeviceMotionEvent(type: string, bubbles: boolean, cancelable: boolean, acceleration: DeviceAccelerationDict | null, accelerationIncludingGravity: DeviceAccelerationDict | null, rotationRate: DeviceRotationRateDict | null, interval: number | null): void;
-}
-
-declare var DeviceMotionEvent: {
-    prototype: DeviceMotionEvent;
-    new(typeArg: string, eventInitDict?: DeviceMotionEventInit): DeviceMotionEvent;
-};
-
-interface DeviceOrientationEvent extends Event {
-    readonly absolute: boolean;
-    readonly alpha: number | null;
-    readonly beta: number | null;
-    readonly gamma: number | null;
-    initDeviceOrientationEvent(type: string, bubbles: boolean, cancelable: boolean, alpha: number | null, beta: number | null, gamma: number | null, absolute: boolean): void;
-}
-
-declare var DeviceOrientationEvent: {
-    prototype: DeviceOrientationEvent;
-    new(typeArg: string, eventInitDict?: DeviceOrientationEventInit): DeviceOrientationEvent;
-};
-
-interface DeviceRotationRate {
-    readonly alpha: number | null;
-    readonly beta: number | null;
-    readonly gamma: number | null;
-}
-
-declare var DeviceRotationRate: {
-    prototype: DeviceRotationRate;
-    new(): DeviceRotationRate;
-};
-
-interface DhImportKeyParams extends Algorithm {
-    generator: Uint8Array;
-    prime: Uint8Array;
-}
-
-interface DhKeyAlgorithm extends KeyAlgorithm {
-    generator: Uint8Array;
-    prime: Uint8Array;
-}
-
-interface DhKeyDeriveParams extends Algorithm {
-    public: CryptoKey;
-}
-
-interface DhKeyGenParams extends Algorithm {
-    generator: Uint8Array;
-    prime: Uint8Array;
-}
-
-interface DocumentEventMap extends GlobalEventHandlersEventMap {
-    "abort": UIEvent;
-    "activate": Event;
-    "beforeactivate": Event;
-    "beforedeactivate": Event;
-    "blur": FocusEvent;
-    "canplay": Event;
-    "canplaythrough": Event;
-    "change": Event;
-    "click": MouseEvent;
-    "contextmenu": PointerEvent;
-    "dblclick": MouseEvent;
-    "deactivate": Event;
-    "drag": DragEvent;
-    "dragend": DragEvent;
-    "dragenter": DragEvent;
-    "dragleave": DragEvent;
-    "dragover": DragEvent;
-    "dragstart": DragEvent;
-    "drop": DragEvent;
-    "durationchange": Event;
-    "emptied": Event;
-    "ended": Event;
-    "error": ErrorEvent;
-    "focus": FocusEvent;
-    "fullscreenchange": Event;
-    "fullscreenerror": Event;
-    "input": Event;
-    "invalid": Event;
-    "keydown": KeyboardEvent;
-    "keypress": KeyboardEvent;
-    "keyup": KeyboardEvent;
-    "load": Event;
-    "loadeddata": Event;
-    "loadedmetadata": Event;
-    "loadstart": Event;
-    "mousedown": MouseEvent;
-    "mousemove": MouseEvent;
-    "mouseout": MouseEvent;
-    "mouseover": MouseEvent;
-    "mouseup": MouseEvent;
-    "mousewheel": WheelEvent;
-    "MSContentZoom": Event;
-    "MSGestureChange": Event;
-    "MSGestureDoubleTap": Event;
-    "MSGestureEnd": Event;
-    "MSGestureHold": Event;
-    "MSGestureStart": Event;
-    "MSGestureTap": Event;
-    "MSInertiaStart": Event;
-    "MSManipulationStateChanged": Event;
-    "MSPointerCancel": Event;
-    "MSPointerDown": Event;
-    "MSPointerEnter": Event;
-    "MSPointerLeave": Event;
-    "MSPointerMove": Event;
-    "MSPointerOut": Event;
-    "MSPointerOver": Event;
-    "MSPointerUp": Event;
-    "mssitemodejumplistitemremoved": Event;
-    "msthumbnailclick": Event;
-    "pause": Event;
-    "play": Event;
-    "playing": Event;
-    "pointerlockchange": Event;
-    "pointerlockerror": Event;
-    "progress": ProgressEvent;
-    "ratechange": Event;
-    "readystatechange": Event;
-    "reset": Event;
-    "scroll": UIEvent;
-    "seeked": Event;
-    "seeking": Event;
-    "select": UIEvent;
-    "selectionchange": Event;
-    "selectstart": Event;
-    "stalled": Event;
-    "stop": Event;
-    "submit": Event;
-    "suspend": Event;
-    "timeupdate": Event;
-    "touchcancel": TouchEvent;
-    "touchend": TouchEvent;
-    "touchmove": TouchEvent;
-    "touchstart": TouchEvent;
-    "volumechange": Event;
-    "waiting": Event;
-    "webkitfullscreenchange": Event;
-    "webkitfullscreenerror": Event;
-}
-
-interface Document extends Node, GlobalEventHandlers, ParentNode, DocumentEvent {
-    /**
-     * Sets or gets the URL for the current document.
-     */
-    readonly URL: string;
-    /**
-     * Gets the URL for the document, stripped of any character encoding.
-     */
-    readonly URLUnencoded: string;
-    /**
-     * Gets the object that has the focus when the parent document has focus.
-     */
-    readonly activeElement: Element;
-    /**
-     * Sets or gets the color of all active links in the document.
-     */
-    alinkColor: string;
-    /**
-     * Returns a reference to the collection of elements contained by the object.
-     */
-    readonly all: HTMLAllCollection;
-    /**
-     * Retrieves a collection of all a objects that have a name and/or id property. Objects in this collection are in HTML source order.
-     */
-    readonly anchors: HTMLCollectionOf<HTMLAnchorElement>;
-    /**
-     * Retrieves a collection of all applet objects in the document.
-     */
-    readonly applets: HTMLCollectionOf<HTMLAppletElement>;
-    /**
-     * Deprecated. Sets or retrieves a value that indicates the background color behind the object.
-     */
-    bgColor: string;
-    /**
-     * Specifies the beginning and end of the document body.
-     */
-    body: HTMLElement;
-    readonly characterSet: string;
-    /**
-     * Gets or sets the character set used to encode the object.
-     */
-    charset: string;
-    /**
-     * Gets a value that indicates whether standards-compliant mode is switched on for the object.
-     */
-    readonly compatMode: string;
-    cookie: string;
-    readonly currentScript: HTMLScriptElement | SVGScriptElement | null;
-    readonly defaultView: Window;
-    /**
-     * Sets or gets a value that indicates whether the document can be edited.
-     */
-    designMode: string;
-    /**
-     * Sets or retrieves a value that indicates the reading order of the object.
-     */
-    dir: string;
-    /**
-     * Gets an object representing the document type declaration associated with the current document.
-     */
-    readonly doctype: DocumentType;
-    /**
-     * Gets a reference to the root node of the document.
-     */
-    readonly documentElement: HTMLElement;
-    /**
-     * Sets or gets the security domain of the document.
-     */
-    domain: string;
-    /**
-     * Retrieves a collection of all embed objects in the document.
-     */
-    readonly embeds: HTMLCollectionOf<HTMLEmbedElement>;
-    /**
-     * Sets or gets the foreground (text) color of the document.
-     */
-    fgColor: string;
-    /**
-     * Retrieves a collection, in source order, of all form objects in the document.
-     */
-    readonly forms: HTMLCollectionOf<HTMLFormElement>;
-    readonly fullscreenElement: Element | null;
-    readonly fullscreenEnabled: boolean;
-    readonly head: HTMLHeadElement;
-    readonly hidden: boolean;
-    /**
-     * Retrieves a collection, in source order, of img objects in the document.
-     */
-    readonly images: HTMLCollectionOf<HTMLImageElement>;
-    /**
-     * Gets the implementation object of the current document.
-     */
-    readonly implementation: DOMImplementation;
-    /**
-     * Returns the character encoding used to create the webpage that is loaded into the document object.
-     */
-    readonly inputEncoding: string | null;
-    /**
-     * Gets the date that the page was last modified, if the page supplies one.
-     */
-    readonly lastModified: string;
-    /**
-     * Sets or gets the color of the document links.
-     */
-    linkColor: string;
-    /**
-     * Retrieves a collection of all a objects that specify the href property and all area objects in the document.
-     */
-    readonly links: HTMLCollectionOf<HTMLAnchorElement | HTMLAreaElement>;
-    /**
-     * Contains information about the current URL.
-     */
-    location: Location;
-    msCSSOMElementFloatMetrics: boolean;
-    msCapsLockWarningOff: boolean;
-    /**
-     * Fires when the user aborts the download.
-     * @param ev The event.
-     */
-    onabort: ((this: Document, ev: UIEvent) => any) | null;
-    /**
-     * Fires when the object is set as the active element.
-     * @param ev The event.
-     */
-    onactivate: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires immediately before the object is set as the active element.
-     * @param ev The event.
-     */
-    onbeforeactivate: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires immediately before the activeElement is changed from the current object to another object in the parent document.
-     * @param ev The event.
-     */
-    onbeforedeactivate: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the object loses the input focus.
-     * @param ev The focus event.
-     */
-    onblur: ((this: Document, ev: FocusEvent) => any) | null;
-    /**
-     * Occurs when playback is possible, but would require further buffering.
-     * @param ev The event.
-     */
-    oncanplay: ((this: Document, ev: Event) => any) | null;
-    oncanplaythrough: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the contents of the object or selection have changed.
-     * @param ev The event.
-     */
-    onchange: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the user clicks the left mouse button on the object
-     * @param ev The mouse event.
-     */
-    onclick: ((this: Document, ev: MouseEvent) => any) | null;
-    /**
-     * Fires when the user clicks the right mouse button in the client area, opening the context menu.
-     * @param ev The mouse event.
-     */
-    oncontextmenu: ((this: Document, ev: PointerEvent) => any) | null;
-    /**
-     * Fires when the user double-clicks the object.
-     * @param ev The mouse event.
-     */
-    ondblclick: ((this: Document, ev: MouseEvent) => any) | null;
-    /**
-     * Fires when the activeElement is changed from the current object to another object in the parent document.
-     * @param ev The UI Event
-     */
-    ondeactivate: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires on the source object continuously during a drag operation.
-     * @param ev The event.
-     */
-    ondrag: ((this: Document, ev: DragEvent) => any) | null;
-    /**
-     * Fires on the source object when the user releases the mouse at the close of a drag operation.
-     * @param ev The event.
-     */
-    ondragend: ((this: Document, ev: DragEvent) => any) | null;
-    /**
-     * Fires on the target element when the user drags the object to a valid drop target.
-     * @param ev The drag event.
-     */
-    ondragenter: ((this: Document, ev: DragEvent) => any) | null;
-    /**
-     * Fires on the target object when the user moves the mouse out of a valid drop target during a drag operation.
-     * @param ev The drag event.
-     */
-    ondragleave: ((this: Document, ev: DragEvent) => any) | null;
-    /**
-     * Fires on the target element continuously while the user drags the object over a valid drop target.
-     * @param ev The event.
-     */
-    ondragover: ((this: Document, ev: DragEvent) => any) | null;
-    /**
-     * Fires on the source object when the user starts to drag a text selection or selected object.
-     * @param ev The event.
-     */
-    ondragstart: ((this: Document, ev: DragEvent) => any) | null;
-    ondrop: ((this: Document, ev: DragEvent) => any) | null;
-    /**
-     * Occurs when the duration attribute is updated.
-     * @param ev The event.
-     */
-    ondurationchange: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when the media element is reset to its initial state.
-     * @param ev The event.
-     */
-    onemptied: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when the end of playback is reached.
-     * @param ev The event
-     */
-    onended: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when an error occurs during object loading.
-     * @param ev The event.
-     */
-    onerror: ((this: Document, ev: ErrorEvent) => any) | null;
-    /**
-     * Fires when the object receives focus.
-     * @param ev The event.
-     */
-    onfocus: ((this: Document, ev: FocusEvent) => any) | null;
-    onfullscreenchange: ((this: Document, ev: Event) => any) | null;
-    onfullscreenerror: ((this: Document, ev: Event) => any) | null;
-    oninput: ((this: Document, ev: Event) => any) | null;
-    oninvalid: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the user presses a key.
-     * @param ev The keyboard event
-     */
-    onkeydown: ((this: Document, ev: KeyboardEvent) => any) | null;
-    /**
-     * Fires when the user presses an alphanumeric key.
-     * @param ev The event.
-     */
-    onkeypress: ((this: Document, ev: KeyboardEvent) => any) | null;
-    /**
-     * Fires when the user releases a key.
-     * @param ev The keyboard event
-     */
-    onkeyup: ((this: Document, ev: KeyboardEvent) => any) | null;
-    /**
-     * Fires immediately after the browser loads the object.
-     * @param ev The event.
-     */
-    onload: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when media data is loaded at the current playback position.
-     * @param ev The event.
-     */
-    onloadeddata: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when the duration and dimensions of the media have been determined.
-     * @param ev The event.
-     */
-    onloadedmetadata: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when Internet Explorer begins looking for media data.
-     * @param ev The event.
-     */
-    onloadstart: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the user clicks the object with either mouse button.
-     * @param ev The mouse event.
-     */
-    onmousedown: ((this: Document, ev: MouseEvent) => any) | null;
-    /**
-     * Fires when the user moves the mouse over the object.
-     * @param ev The mouse event.
-     */
-    onmousemove: ((this: Document, ev: MouseEvent) => any) | null;
-    /**
-     * Fires when the user moves the mouse pointer outside the boundaries of the object.
-     * @param ev The mouse event.
-     */
-    onmouseout: ((this: Document, ev: MouseEvent) => any) | null;
-    /**
-     * Fires when the user moves the mouse pointer into the object.
-     * @param ev The mouse event.
-     */
-    onmouseover: ((this: Document, ev: MouseEvent) => any) | null;
-    /**
-     * Fires when the user releases a mouse button while the mouse is over the object.
-     * @param ev The mouse event.
-     */
-    onmouseup: ((this: Document, ev: MouseEvent) => any) | null;
-    /**
-     * Fires when the wheel button is rotated.
-     * @param ev The mouse event
-     */
-    onmousewheel: ((this: Document, ev: WheelEvent) => any) | null;
-    onmscontentzoom: ((this: Document, ev: Event) => any) | null;
-    onmsgesturechange: ((this: Document, ev: Event) => any) | null;
-    onmsgesturedoubletap: ((this: Document, ev: Event) => any) | null;
-    onmsgestureend: ((this: Document, ev: Event) => any) | null;
-    onmsgesturehold: ((this: Document, ev: Event) => any) | null;
-    onmsgesturestart: ((this: Document, ev: Event) => any) | null;
-    onmsgesturetap: ((this: Document, ev: Event) => any) | null;
-    onmsinertiastart: ((this: Document, ev: Event) => any) | null;
-    onmsmanipulationstatechanged: ((this: Document, ev: Event) => any) | null;
-    onmspointercancel: ((this: Document, ev: Event) => any) | null;
-    onmspointerdown: ((this: Document, ev: Event) => any) | null;
-    onmspointerenter: ((this: Document, ev: Event) => any) | null;
-    onmspointerleave: ((this: Document, ev: Event) => any) | null;
-    onmspointermove: ((this: Document, ev: Event) => any) | null;
-    onmspointerout: ((this: Document, ev: Event) => any) | null;
-    onmspointerover: ((this: Document, ev: Event) => any) | null;
-    onmspointerup: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when an item is removed from a Jump List of a webpage running in Site Mode.
-     * @param ev The event.
-     */
-    onmssitemodejumplistitemremoved: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when a user clicks a button in a Thumbnail Toolbar of a webpage running in Site Mode.
-     * @param ev The event.
-     */
-    onmsthumbnailclick: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when playback is paused.
-     * @param ev The event.
-     */
-    onpause: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when the play method is requested.
-     * @param ev The event.
-     */
-    onplay: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when the audio or video has started playing.
-     * @param ev The event.
-     */
-    onplaying: ((this: Document, ev: Event) => any) | null;
-    onpointerlockchange: ((this: Document, ev: Event) => any) | null;
-    onpointerlockerror: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs to indicate progress while downloading media data.
-     * @param ev The event.
-     */
-    onprogress: ((this: Document, ev: ProgressEvent) => any) | null;
-    /**
-     * Occurs when the playback rate is increased or decreased.
-     * @param ev The event.
-     */
-    onratechange: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the state of the object has changed.
-     * @param ev The event
-     */
-    onreadystatechange: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the user resets a form.
-     * @param ev The event.
-     */
-    onreset: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the user repositions the scroll box in the scroll bar on the object.
-     * @param ev The event.
-     */
-    onscroll: ((this: Document, ev: UIEvent) => any) | null;
-    /**
-     * Occurs when the seek operation ends.
-     * @param ev The event.
-     */
-    onseeked: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when the current playback position is moved.
-     * @param ev The event.
-     */
-    onseeking: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the current selection changes.
-     * @param ev The event.
-     */
-    onselect: ((this: Document, ev: UIEvent) => any) | null;
-    /**
-     * Fires when the selection state of a document changes.
-     * @param ev The event.
-     */
-    onselectionchange: ((this: Document, ev: Event) => any) | null;
-    onselectstart: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when the download has stopped.
-     * @param ev The event.
-     */
-    onstalled: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Fires when the user clicks the Stop button or leaves the Web page.
-     * @param ev The event.
-     */
-    onstop: ((this: Document, ev: Event) => any) | null;
-    onsubmit: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs if the load operation has been intentionally halted.
-     * @param ev The event.
-     */
-    onsuspend: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs to indicate the current playback position.
-     * @param ev The event.
-     */
-    ontimeupdate: ((this: Document, ev: Event) => any) | null;
-    ontouchcancel: ((this: Document, ev: TouchEvent) => any) | null;
-    ontouchend: ((this: Document, ev: TouchEvent) => any) | null;
-    ontouchmove: ((this: Document, ev: TouchEvent) => any) | null;
-    ontouchstart: ((this: Document, ev: TouchEvent) => any) | null;
-    onvisibilitychange: (this: Document, ev: Event) => any;
-    /**
-     * Occurs when the volume is changed, or playback is muted or unmuted.
-     * @param ev The event.
-     */
-    onvolumechange: ((this: Document, ev: Event) => any) | null;
-    /**
-     * Occurs when playback stops because the next frame of a video resource is not available.
-     * @param ev The event.
-     */
-    onwaiting: ((this: Document, ev: Event) => any) | null;
-    onwebkitfullscreenchange: ((this: Document, ev: Event) => any) | null;
-    onwebkitfullscreenerror: ((this: Document, ev: Event) => any) | null;
-    readonly plugins: HTMLCollectionOf<HTMLEmbedElement>;
-    readonly pointerLockElement: Element;
-    /**
-     * Retrieves a value that indicates the current state of the object.
-     */
-    readonly readyState: DocumentReadyState;
-    /**
-     * Gets the URL of the location that referred the user to the current page.
-     */
-    readonly referrer: string;
-    /**
-     * Gets the root svg element in the document hierarchy.
-     */
-    readonly rootElement: SVGSVGElement;
-    /**
-     * Retrieves a collection of all script objects in the document.
-     */
-    readonly scripts: HTMLCollectionOf<HTMLScriptElement>;
-    readonly scrollingElement: Element | null;
-    /**
-     * Retrieves a collection of styleSheet objects representing the style sheets that correspond to each instance of a link or style object in the document.
-     */
-    readonly styleSheets: StyleSheetList;
-    /**
-     * Contains the title of the document.
-     */
-    title: string;
-    readonly visibilityState: VisibilityState;
-    /**
-     * Sets or gets the color of the links that the user has visited.
-     */
-    vlinkColor: string;
-    readonly webkitCurrentFullScreenElement: Element | null;
-    readonly webkitFullscreenElement: Element | null;
-    readonly webkitFullscreenEnabled: boolean;
-    readonly webkitIsFullScreen: boolean;
-    readonly xmlEncoding: string | null;
-    xmlStandalone: boolean;
-    /**
-     * Gets or sets the version attribute specified in the declaration of an XML document.
-     */
-    xmlVersion: string | null;
-    adoptNode<T extends Node>(source: T): T;
-    captureEvents(): void;
-    caretRangeFromPoint(x: number, y: number): Range;
-    clear(): void;
-    /**
-     * Closes an output stream and forces the sent data to display.
-     */
-    close(): void;
-    /**
-     * Creates an attribute object with a specified name.
-     * @param name String that sets the attribute object's name.
-     */
-    createAttribute(name: string): Attr;
-    createAttributeNS(namespaceURI: string | null, qualifiedName: string): Attr;
-    createCDATASection(data: string): CDATASection;
-    /**
-     * Creates a comment object with the specified data.
-     * @param data Sets the comment object's data.
-     */
-    createComment(data: string): Comment;
-    /**
-     * Creates a new document.
-     */
-    createDocumentFragment(): DocumentFragment;
-    /**
-     * Creates an instance of the element for the specified tag.
-     * @param tagName The name of an element.
-     */
-    createElement<K extends keyof HTMLElementTagNameMap>(tagName: K, options?: ElementCreationOptions): HTMLElementTagNameMap[K];
-    createElement(tagName: string, options?: ElementCreationOptions): HTMLElement;
-    createElementNS(namespaceURI: "http://www.w3.org/1999/xhtml", qualifiedName: string): HTMLElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "a"): SVGAElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "circle"): SVGCircleElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "clipPath"): SVGClipPathElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "componentTransferFunction"): SVGComponentTransferFunctionElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "defs"): SVGDefsElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "desc"): SVGDescElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "ellipse"): SVGEllipseElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feBlend"): SVGFEBlendElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feColorMatrix"): SVGFEColorMatrixElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feComponentTransfer"): SVGFEComponentTransferElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feComposite"): SVGFECompositeElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feConvolveMatrix"): SVGFEConvolveMatrixElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feDiffuseLighting"): SVGFEDiffuseLightingElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feDisplacementMap"): SVGFEDisplacementMapElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feDistantLight"): SVGFEDistantLightElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feFlood"): SVGFEFloodElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feFuncA"): SVGFEFuncAElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feFuncB"): SVGFEFuncBElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feFuncG"): SVGFEFuncGElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feFuncR"): SVGFEFuncRElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feGaussianBlur"): SVGFEGaussianBlurElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feImage"): SVGFEImageElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feMerge"): SVGFEMergeElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feMergeNode"): SVGFEMergeNodeElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feMorphology"): SVGFEMorphologyElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feOffset"): SVGFEOffsetElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "fePointLight"): SVGFEPointLightElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feSpecularLighting"): SVGFESpecularLightingElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feSpotLight"): SVGFESpotLightElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feTile"): SVGFETileElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "feTurbulence"): SVGFETurbulenceElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "filter"): SVGFilterElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "foreignObject"): SVGForeignObjectElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "g"): SVGGElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "image"): SVGImageElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "gradient"): SVGGradientElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "line"): SVGLineElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "linearGradient"): SVGLinearGradientElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "marker"): SVGMarkerElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "mask"): SVGMaskElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "path"): SVGPathElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "metadata"): SVGMetadataElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "pattern"): SVGPatternElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "polygon"): SVGPolygonElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "polyline"): SVGPolylineElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "radialGradient"): SVGRadialGradientElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "rect"): SVGRectElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "svg"): SVGSVGElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "script"): SVGScriptElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "stop"): SVGStopElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "style"): SVGStyleElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "switch"): SVGSwitchElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "symbol"): SVGSymbolElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "tspan"): SVGTSpanElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "textContent"): SVGTextContentElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "text"): SVGTextElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "textPath"): SVGTextPathElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "textPositioning"): SVGTextPositioningElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "title"): SVGTitleElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "use"): SVGUseElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: "view"): SVGViewElement;
-    createElementNS(namespaceURI: "http://www.w3.org/2000/svg", qualifiedName: string): SVGElement;
-    createElementNS(namespaceURI: string | null, qualifiedName: string): Element;
-    createExpression(expression: string, resolver: XPathNSResolver): XPathExpression;
-    createNSResolver(nodeResolver: Node): XPathNSResolver;
-    /**
-     * Creates a NodeIterator object that you can use to traverse filtered lists of nodes or elements in a document.
-     * @param root The root element or node to start traversing on.
-     * @param whatToShow The type of nodes or elements to appear in the node list
-     * @param filter A custom NodeFilter function to use. For more information, see filter. Use null for no filter.
-     * @param entityReferenceExpansion A flag that specifies whether entity reference nodes are expanded.
-     */
-    createNodeIterator(root: Node, whatToShow?: number, filter?: NodeFilter, entityReferenceExpansion?: boolean): NodeIterator;
-    createProcessingInstruction(target: string, data: string): ProcessingInstruction;
-    /**
-     *  Returns an empty range object that has both of its boundary points positioned at the beginning of the document.
-     */
-    createRange(): Range;
-    /**
-     * Creates a text string from the specified value.
-     * @param data String that specifies the nodeValue property of the text node.
-     */
-    createTextNode(data: string): Text;
-    createTouch(view: Window, target: EventTarget, identifier: number, pageX: number, pageY: number, screenX: number, screenY: number): Touch;
-    createTouchList(...touches: Touch[]): TouchList;
-    /**
-     * Creates a TreeWalker object that you can use to traverse filtered lists of nodes or elements in a document.
-     * @param root The root element or node to start traversing on.
-     * @param whatToShow The type of nodes or elements to appear in the node list. For more information, see whatToShow.
-     * @param filter A custom NodeFilter function to use.
-     * @param entityReferenceExpansion A flag that specifies whether entity reference nodes are expanded.
-     */
-    createTreeWalker(root: Node, whatToShow?: number, filter?: NodeFilter, entityReferenceExpansion?: boolean): TreeWalker;
-    /**
-     * Returns the element for the specified x coordinate and the specified y coordinate.
-     * @param x The x-offset
-     * @param y The y-offset
-     */
-    elementFromPoint(x: number, y: number): Element;
-    elementsFromPoint(x: number, y: number): Element[];
-    evaluate(expression: string, contextNode: Node, resolver: XPathNSResolver | null, type: number, result: XPathResult | null): XPathResult;
-    /**
-     * Executes a command on the current document, current selection, or the given range.
-     * @param commandId String that specifies the command to execute. This command can be any of the command identifiers that can be executed in script.
-     * @param showUI Display the user interface, defaults to false.
-     * @param value Value to assign.
-     */
-    execCommand(commandId: string, showUI?: boolean, value?: any): boolean;
-    /**
-     * Displays help information for the given command identifier.
-     * @param commandId Displays help information for the given command identifier.
-     */
-    execCommandShowHelp(commandId: string): boolean;
-    exitFullscreen(): void;
-    exitPointerLock(): void;
-    /**
-     * Causes the element to receive the focus and executes the code specified by the onfocus event.
-     */
-    /** @deprecated */
-    focus(): void;
-    /**
-     * Returns a reference to the first object with the specified value of the ID or NAME attribute.
-     * @param elementId String that specifies the ID value. Case-insensitive.
-     */
-    getElementById(elementId: string): HTMLElement | null;
-    getElementsByClassName(classNames: string): HTMLCollectionOf<Element>;
-    /**
-     * Gets a collection of objects based on the value of the NAME or ID attribute.
-     * @param elementName Gets a collection of objects based on the value of the NAME or ID attribute.
-     */
-    getElementsByName(elementName: string): NodeListOf<HTMLElement>;
-    /**
-     * Retrieves a collection of objects based on the specified element name.
-     * @param name Specifies the name of an element.
-     */
-    getElementsByTagName<K extends keyof HTMLElementTagNameMap>(tagname: K): NodeListOf<HTMLElementTagNameMap[K]>;
-    getElementsByTagName<K extends keyof SVGElementTagNameMap>(tagname: K): NodeListOf<SVGElementTagNameMap[K]>;
-    getElementsByTagName(tagname: string): NodeListOf<Element>;
-    getElementsByTagNameNS(namespaceURI: "http://www.w3.org/1999/xhtml", localName: string): HTMLCollectionOf<HTMLElement>;
-    getElementsByTagNameNS(namespaceURI: "http://www.w3.org/2000/svg", localName: string): HTMLCollectionOf<SVGElement>;
-    getElementsByTagNameNS(namespaceURI: string, localName: string): HTMLCollectionOf<Element>;
-    /**
-     * Returns an object representing the current selection of the document that is loaded into the object displaying a webpage.
-     */
-    getSelection(): Selection;
-    /**
-     * Gets a value indicating whether the object currently has focus.
-     */
-    hasFocus(): boolean;
-    importNode<T extends Node>(importedNode: T, deep: boolean): T;
-    msElementsFromPoint(x: number, y: number): NodeListOf<Element>;
-    msElementsFromRect(left: number, top: number, width: number, height: number): NodeListOf<Element>;
-    /**
-     * Opens a new window and loads a document specified by a given URL. Also, opens a new window that uses the url parameter and the name parameter to collect the output of the write method and the writeln method.
-     * @param url Specifies a MIME type for the document.
-     * @param name Specifies the name of the window. This name is used as the value for the TARGET attribute on a form or an anchor element.
-     * @param features Contains a list of items separated by commas. Each item consists of an option and a value, separated by an equals sign (for example, "fullscreen=yes, toolbar=yes"). The following values are supported.
-     * @param replace Specifies whether the existing entry for the document is replaced in the history list.
-     */
-    open(url?: string, name?: string, features?: string, replace?: boolean): Document;
-    /**
-     * Returns a Boolean value that indicates whether a specified command can be successfully executed using execCommand, given the current state of the document.
-     * @param commandId Specifies a command identifier.
-     */
-    queryCommandEnabled(commandId: string): boolean;
-    /**
-     * Returns a Boolean value that indicates whether the specified command is in the indeterminate state.
-     * @param commandId String that specifies a command identifier.
-     */
-    queryCommandIndeterm(commandId: string): boolean;
-    /**
-     * Returns a Boolean value that indicates the current state of the command.
-     * @param commandId String that specifies a command identifier.
-     */
-    queryCommandState(commandId: string): boolean;
-    /**
-     * Returns a Boolean value that indicates whether the current command is supported on the current range.
-     * @param commandId Specifies a command identifier.
-     */
-    queryCommandSupported(commandId: string): boolean;
-    /**
-     * Retrieves the string associated with a command.
-     * @param commandId String that contains the identifier of a command. This can be any command identifier given in the list of Command Identifiers.
-     */
-    queryCommandText(commandId: string): string;
-    /**
-     * Returns the current value of the document, range, or current selection for the given command.
-     * @param commandId String that specifies a command identifier.
-     */
-    queryCommandValue(commandId: string): string;
-    releaseEvents(): void;
-    updateSettings(): void;
-    webkitCancelFullScreen(): void;
-    webkitExitFullscreen(): void;
-    /**
-     * Writes one or more HTML expressions to a document in the specified window.
-     * @param content Specifies the text and HTML tags to write.
-     */
-    write(...content: string[]): void;
-    /**
-     * Writes one or more HTML expressions, followed by a carriage return, to a document in the specified window.
-     * @param content The text and HTML tags to write.
-     */
-    writeln(...content: string[]): void;
-    addEventListener<K extends keyof DocumentEventMap>(type: K, listener: (this: Document, ev: DocumentEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof DocumentEventMap>(type: K, listener: (this: Document, ev: DocumentEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var Document: {
-    prototype: Document;
-    new(): Document;
-};
-
-interface DocumentEvent {
-    createEvent(eventInterface: "AnimationEvent"): AnimationEvent;
-    createEvent(eventInterface: "AnimationPlaybackEvent"): AnimationPlaybackEvent;
-    createEvent(eventInterface: "AudioProcessingEvent"): AudioProcessingEvent;
-    createEvent(eventInterface: "BeforeUnloadEvent"): BeforeUnloadEvent;
-    createEvent(eventInterface: "ClipboardEvent"): ClipboardEvent;
-    createEvent(eventInterface: "CloseEvent"): CloseEvent;
-    createEvent(eventInterface: "CompositionEvent"): CompositionEvent;
-    createEvent(eventInterface: "CustomEvent"): CustomEvent;
-    createEvent(eventInterface: "DeviceLightEvent"): DeviceLightEvent;
-    createEvent(eventInterface: "DeviceMotionEvent"): DeviceMotionEvent;
-    createEvent(eventInterface: "DeviceOrientationEvent"): DeviceOrientationEvent;
-    createEvent(eventInterface: "DragEvent"): DragEvent;
-    createEvent(eventInterface: "ErrorEvent"): ErrorEvent;
-    createEvent(eventInterface: "Event"): Event;
-    createEvent(eventInterface: "Events"): Event;
-    createEvent(eventInterface: "FocusEvent"): FocusEvent;
-    createEvent(eventInterface: "FocusNavigationEvent"): FocusNavigationEvent;
-    createEvent(eventInterface: "GamepadEvent"): GamepadEvent;
-    createEvent(eventInterface: "HashChangeEvent"): HashChangeEvent;
-    createEvent(eventInterface: "IDBVersionChangeEvent"): IDBVersionChangeEvent;
-    createEvent(eventInterface: "KeyboardEvent"): KeyboardEvent;
-    createEvent(eventInterface: "ListeningStateChangedEvent"): ListeningStateChangedEvent;
-    createEvent(eventInterface: "MSDCCEvent"): MSDCCEvent;
-    createEvent(eventInterface: "MSDSHEvent"): MSDSHEvent;
-    createEvent(eventInterface: "MSMediaKeyMessageEvent"): MSMediaKeyMessageEvent;
-    createEvent(eventInterface: "MSMediaKeyNeededEvent"): MSMediaKeyNeededEvent;
-    createEvent(eventInterface: "MediaEncryptedEvent"): MediaEncryptedEvent;
-    createEvent(eventInterface: "MediaKeyMessageEvent"): MediaKeyMessageEvent;
-    createEvent(eventInterface: "MediaStreamErrorEvent"): MediaStreamErrorEvent;
-    createEvent(eventInterface: "MediaStreamEvent"): MediaStreamEvent;
-    createEvent(eventInterface: "MediaStreamTrackEvent"): MediaStreamTrackEvent;
-    createEvent(eventInterface: "MessageEvent"): MessageEvent;
-    createEvent(eventInterface: "MouseEvent"): MouseEvent;
-    createEvent(eventInterface: "MouseEvents"): MouseEvent;
-    createEvent(eventInterface: "MutationEvent"): MutationEvent;
-    createEvent(eventInterface: "MutationEvents"): MutationEvent;
-    createEvent(eventInterface: "OfflineAudioCompletionEvent"): OfflineAudioCompletionEvent;
-    createEvent(eventInterface: "OverflowEvent"): OverflowEvent;
-    createEvent(eventInterface: "PageTransitionEvent"): PageTransitionEvent;
-    createEvent(eventInterface: "PaymentRequestUpdateEvent"): PaymentRequestUpdateEvent;
-    createEvent(eventInterface: "PermissionRequestedEvent"): PermissionRequestedEvent;
-    createEvent(eventInterface: "PointerEvent"): PointerEvent;
-    createEvent(eventInterface: "PopStateEvent"): PopStateEvent;
-    createEvent(eventInterface: "ProgressEvent"): ProgressEvent;
-    createEvent(eventInterface: "PromiseRejectionEvent"): PromiseRejectionEvent;
-    createEvent(eventInterface: "RTCDTMFToneChangeEvent"): RTCDTMFToneChangeEvent;
-    createEvent(eventInterface: "RTCDtlsTransportStateChangedEvent"): RTCDtlsTransportStateChangedEvent;
-    createEvent(eventInterface: "RTCIceCandidatePairChangedEvent"): RTCIceCandidatePairChangedEvent;
-    createEvent(eventInterface: "RTCIceGathererEvent"): RTCIceGathererEvent;
-    createEvent(eventInterface: "RTCIceTransportStateChangedEvent"): RTCIceTransportStateChangedEvent;
-    createEvent(eventInterface: "RTCPeerConnectionIceEvent"): RTCPeerConnectionIceEvent;
-    createEvent(eventInterface: "RTCSsrcConflictEvent"): RTCSsrcConflictEvent;
-    createEvent(eventInterface: "SVGZoomEvent"): SVGZoomEvent;
-    createEvent(eventInterface: "SVGZoomEvents"): SVGZoomEvent;
-    createEvent(eventInterface: "SecurityPolicyViolationEvent"): SecurityPolicyViolationEvent;
-    createEvent(eventInterface: "ServiceWorkerMessageEvent"): ServiceWorkerMessageEvent;
-    createEvent(eventInterface: "SpeechSynthesisEvent"): SpeechSynthesisEvent;
-    createEvent(eventInterface: "StorageEvent"): StorageEvent;
-    createEvent(eventInterface: "TextEvent"): TextEvent;
-    createEvent(eventInterface: "TouchEvent"): TouchEvent;
-    createEvent(eventInterface: "TrackEvent"): TrackEvent;
-    createEvent(eventInterface: "TransitionEvent"): TransitionEvent;
-    createEvent(eventInterface: "UIEvent"): UIEvent;
-    createEvent(eventInterface: "UIEvents"): UIEvent;
-    createEvent(eventInterface: "VRDisplayEvent"): VRDisplayEvent;
-    createEvent(eventInterface: "VRDisplayEvent "): VRDisplayEvent ;
-    createEvent(eventInterface: "WebGLContextEvent"): WebGLContextEvent;
-    createEvent(eventInterface: "WheelEvent"): WheelEvent;
-    createEvent(eventInterface: string): Event;
-}
-
-interface DocumentFragment extends Node, ParentNode {
-    getElementById(elementId: string): HTMLElement | null;
-}
-
-declare var DocumentFragment: {
-    prototype: DocumentFragment;
-    new(): DocumentFragment;
-};
-
-interface DocumentOrShadowRoot {
-    readonly activeElement: Element | null;
-    readonly styleSheets: StyleSheetList;
-    elementFromPoint(x: number, y: number): Element | null;
-    elementsFromPoint(x: number, y: number): Element[];
-    getSelection(): Selection | null;
-}
-
-interface DocumentType extends Node, ChildNode {
-    readonly entities: NamedNodeMap;
-    readonly internalSubset: string | null;
-    readonly name: string;
-    readonly notations: NamedNodeMap;
-    readonly publicId: string;
-    readonly systemId: string;
-}
-
-declare var DocumentType: {
-    prototype: DocumentType;
-    new(): DocumentType;
-};
-
-interface DragEvent extends MouseEvent {
-    readonly dataTransfer: DataTransfer;
-    initDragEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number, screenXArg: number, screenYArg: number, clientXArg: number, clientYArg: number, ctrlKeyArg: boolean, altKeyArg: boolean, shiftKeyArg: boolean, metaKeyArg: boolean, buttonArg: number, relatedTargetArg: EventTarget, dataTransferArg: DataTransfer): void;
-    msConvertURL(file: File, targetType: string, targetURL?: string): void;
-}
-
-declare var DragEvent: {
-    prototype: DragEvent;
-    new(type: "drag" | "dragend" | "dragenter" | "dragexit" | "dragleave" | "dragover" | "dragstart" | "drop", dragEventInit?: { dataTransfer?: DataTransfer }): DragEvent;
-};
-
-interface DynamicsCompressorNode extends AudioNode {
-    readonly attack: AudioParam;
-    readonly knee: AudioParam;
-    readonly ratio: AudioParam;
-    readonly reduction: number;
-    readonly release: AudioParam;
-    readonly threshold: AudioParam;
-}
-
-declare var DynamicsCompressorNode: {
-    prototype: DynamicsCompressorNode;
-    new(): DynamicsCompressorNode;
-};
-
-interface EXT_blend_minmax {
-    readonly MAX_EXT: number;
-    readonly MIN_EXT: number;
-}
-
-interface EXT_frag_depth {
-}
-
-interface EXT_sRGB {
-    readonly FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING_EXT: number;
-    readonly SRGB8_ALPHA8_EXT: number;
-    readonly SRGB_ALPHA_EXT: number;
-    readonly SRGB_EXT: number;
-}
-
-interface EXT_shader_texture_lod {
-}
-
-interface EXT_texture_filter_anisotropic {
-    readonly MAX_TEXTURE_MAX_ANISOTROPY_EXT: number;
-    readonly TEXTURE_MAX_ANISOTROPY_EXT: number;
-}
-
-declare var EXT_texture_filter_anisotropic: {
-    prototype: EXT_texture_filter_anisotropic;
-    new(): EXT_texture_filter_anisotropic;
-    readonly MAX_TEXTURE_MAX_ANISOTROPY_EXT: number;
-    readonly TEXTURE_MAX_ANISOTROPY_EXT: number;
-};
-
-interface ElementEventMap extends GlobalEventHandlersEventMap {
-    "ariarequest": Event;
-    "command": Event;
-    "gotpointercapture": PointerEvent;
-    "lostpointercapture": PointerEvent;
-    "MSGestureChange": Event;
-    "MSGestureDoubleTap": Event;
-    "MSGestureEnd": Event;
-    "MSGestureHold": Event;
-    "MSGestureStart": Event;
-    "MSGestureTap": Event;
-    "MSGotPointerCapture": Event;
-    "MSInertiaStart": Event;
-    "MSLostPointerCapture": Event;
-    "MSPointerCancel": Event;
-    "MSPointerDown": Event;
-    "MSPointerEnter": Event;
-    "MSPointerLeave": Event;
-    "MSPointerMove": Event;
-    "MSPointerOut": Event;
-    "MSPointerOver": Event;
-    "MSPointerUp": Event;
-    "touchcancel": TouchEvent;
-    "touchend": TouchEvent;
-    "touchmove": TouchEvent;
-    "touchstart": TouchEvent;
-    "webkitfullscreenchange": Event;
-    "webkitfullscreenerror": Event;
-}
-
-interface Element extends Node, GlobalEventHandlers, ElementTraversal, ParentNode, ChildNode {
-    readonly assignedSlot: HTMLSlotElement | null;
-    readonly attributes: NamedNodeMap;
-    readonly classList: DOMTokenList;
-    className: string;
-    readonly clientHeight: number;
-    readonly clientLeft: number;
-    readonly clientTop: number;
-    readonly clientWidth: number;
-    id: string;
-    innerHTML: string;
-    msContentZoomFactor: number;
-    readonly msRegionOverflow: string;
-    onariarequest: ((this: Element, ev: Event) => any) | null;
-    oncommand: ((this: Element, ev: Event) => any) | null;
-    ongotpointercapture: ((this: Element, ev: PointerEvent) => any) | null;
-    onlostpointercapture: ((this: Element, ev: PointerEvent) => any) | null;
-    onmsgesturechange: ((this: Element, ev: Event) => any) | null;
-    onmsgesturedoubletap: ((this: Element, ev: Event) => any) | null;
-    onmsgestureend: ((this: Element, ev: Event) => any) | null;
-    onmsgesturehold: ((this: Element, ev: Event) => any) | null;
-    onmsgesturestart: ((this: Element, ev: Event) => any) | null;
-    onmsgesturetap: ((this: Element, ev: Event) => any) | null;
-    onmsgotpointercapture: ((this: Element, ev: Event) => any) | null;
-    onmsinertiastart: ((this: Element, ev: Event) => any) | null;
-    onmslostpointercapture: ((this: Element, ev: Event) => any) | null;
-    onmspointercancel: ((this: Element, ev: Event) => any) | null;
-    onmspointerdown: ((this: Element, ev: Event) => any) | null;
-    onmspointerenter: ((this: Element, ev: Event) => any) | null;
-    onmspointerleave: ((this: Element, ev: Event) => any) | null;
-    onmspointermove: ((this: Element, ev: Event) => any) | null;
-    onmspointerout: ((this: Element, ev: Event) => any) | null;
-    onmspointerover: ((this: Element, ev: Event) => any) | null;
-    onmspointerup: ((this: Element, ev: Event) => any) | null;
-    ontouchcancel: ((this: Element, ev: TouchEvent) => any) | null;
-    ontouchend: ((this: Element, ev: TouchEvent) => any) | null;
-    ontouchmove: ((this: Element, ev: TouchEvent) => any) | null;
-    ontouchstart: ((this: Element, ev: TouchEvent) => any) | null;
-    onwebkitfullscreenchange: ((this: Element, ev: Event) => any) | null;
-    onwebkitfullscreenerror: ((this: Element, ev: Event) => any) | null;
-    outerHTML: string;
-    readonly prefix: string | null;
-    readonly scrollHeight: number;
-    scrollLeft: number;
-    scrollTop: number;
-    readonly scrollWidth: number;
-    readonly shadowRoot: ShadowRoot | null;
-    slot: string;
-    readonly tagName: string;
-    attachShadow(shadowRootInitDict: ShadowRootInit): ShadowRoot;
-    closest<K extends keyof HTMLElementTagNameMap>(selector: K): HTMLElementTagNameMap[K] | null;
-    closest<K extends keyof SVGElementTagNameMap>(selector: K): SVGElementTagNameMap[K] | null;
-    closest(selector: string): Element | null;
-    getAttribute(qualifiedName: string): string | null;
-    getAttributeNS(namespaceURI: string, localName: string): string;
-    getAttributeNode(name: string): Attr | null;
-    getAttributeNodeNS(namespaceURI: string, localName: string): Attr | null;
-    getBoundingClientRect(): ClientRect | DOMRect;
-    getClientRects(): ClientRectList | DOMRectList;
-    getElementsByClassName(classNames: string): NodeListOf<Element>;
-    getElementsByTagName<K extends keyof HTMLElementTagNameMap>(name: K): NodeListOf<HTMLElementTagNameMap[K]>;
-    getElementsByTagName<K extends keyof SVGElementTagNameMap>(name: K): NodeListOf<SVGElementTagNameMap[K]>;
-    getElementsByTagName(name: string): NodeListOf<Element>;
-    getElementsByTagNameNS(namespaceURI: "http://www.w3.org/1999/xhtml", localName: string): HTMLCollectionOf<HTMLElement>;
-    getElementsByTagNameNS(namespaceURI: "http://www.w3.org/2000/svg", localName: string): HTMLCollectionOf<SVGElement>;
-    getElementsByTagNameNS(namespaceURI: string, localName: string): HTMLCollectionOf<Element>;
-    hasAttribute(name: string): boolean;
-    hasAttributeNS(namespaceURI: string, localName: string): boolean;
-    hasAttributes(): boolean;
-    insertAdjacentElement(position: InsertPosition, insertedElement: Element): Element | null;
-    insertAdjacentHTML(where: InsertPosition, html: string): void;
-    insertAdjacentText(where: InsertPosition, text: string): void;
-    matches(selectors: string): boolean;
-    msGetRegionContent(): any;
-    msGetUntransformedBounds(): ClientRect;
-    msMatchesSelector(selectors: string): boolean;
-    msReleasePointerCapture(pointerId: number): void;
-    msSetPointerCapture(pointerId: number): void;
-    msZoomTo(args: MsZoomToOptions): void;
-    releasePointerCapture(pointerId: number): void;
-    removeAttribute(qualifiedName: string): void;
-    removeAttributeNS(namespaceURI: string, localName: string): void;
-    removeAttributeNode(oldAttr: Attr): Attr;
-    requestFullscreen(): void;
-    requestPointerLock(): void;
-    scroll(options?: ScrollToOptions): void;
-    scroll(x: number, y: number): void;
-    scrollBy(options?: ScrollToOptions): void;
-    scrollBy(x: number, y: number): void;
-    scrollIntoView(arg?: boolean | ScrollIntoViewOptions): void;
-    scrollTo(options?: ScrollToOptions): void;
-    scrollTo(x: number, y: number): void;
-    setAttribute(qualifiedName: string, value: string): void;
-    setAttributeNS(namespaceURI: string, qualifiedName: string, value: string): void;
-    setAttributeNode(newAttr: Attr): Attr;
-    setAttributeNodeNS(newAttr: Attr): Attr;
-    setPointerCapture(pointerId: number): void;
-    webkitMatchesSelector(selectors: string): boolean;
-    webkitRequestFullScreen(): void;
-    webkitRequestFullscreen(): void;
-    addEventListener<K extends keyof ElementEventMap>(type: K, listener: (this: Element, ev: ElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof ElementEventMap>(type: K, listener: (this: Element, ev: ElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var Element: {
-    prototype: Element;
-    new(): Element;
-};
-
-interface ElementCSSInlineStyle {
-    readonly style: CSSStyleDeclaration;
-}
-
-interface ElementCreationOptions {
-    is?: string;
-}
-
-interface ElementDefinitionOptions {
-    extends: string;
-}
-
-interface ElementTraversal {
-    readonly childElementCount: number;
-    readonly firstElementChild: Element | null;
-    readonly lastElementChild: Element | null;
-    readonly nextElementSibling: Element | null;
-    readonly previousElementSibling: Element | null;
-}
-
-interface ErrorEvent extends Event {
-    readonly colno: number;
-    readonly error: any;
-    readonly filename: string;
-    readonly lineno: number;
-    readonly message: string;
-    initErrorEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, messageArg: string, filenameArg: string, linenoArg: number): void;
-}
-
-declare var ErrorEvent: {
-    prototype: ErrorEvent;
-    new(typeArg: string, eventInitDict?: ErrorEventInit): ErrorEvent;
-};
-
-interface Event {
-    readonly bubbles: boolean;
-    cancelBubble: boolean;
-    readonly cancelable: boolean;
-    readonly currentTarget: EventTarget | null;
-    readonly defaultPrevented: boolean;
-    readonly eventPhase: number;
-    readonly isTrusted: boolean;
-    returnValue: boolean;
-    readonly scoped: boolean;
-    readonly srcElement: Element | null;
-    readonly target: EventTarget | null;
-    readonly timeStamp: number;
-    readonly type: string;
-    deepPath(): EventTarget[];
-    initEvent(type: string, bubbles?: boolean, cancelable?: boolean): void;
-    preventDefault(): void;
-    stopImmediatePropagation(): void;
-    stopPropagation(): void;
-    readonly AT_TARGET: number;
-    readonly BUBBLING_PHASE: number;
-    readonly CAPTURING_PHASE: number;
-    readonly NONE: number;
-}
-
-declare var Event: {
-    prototype: Event;
-    new(typeArg: string, eventInitDict?: EventInit): Event;
-    readonly AT_TARGET: number;
-    readonly BUBBLING_PHASE: number;
-    readonly CAPTURING_PHASE: number;
-    readonly NONE: number;
-};
-
-interface EventListenerObject {
-    handleEvent(evt: Event): void;
-}
-
-interface EventSource extends EventTarget {
-    readonly CLOSED: number;
-    readonly CONNECTING: number;
-    readonly OPEN: number;
-    onerror: (evt: MessageEvent) => any;
-    onmessage: (evt: MessageEvent) => any;
-    onopen: (evt: MessageEvent) => any;
-    readonly readyState: number;
-    readonly url: string;
-    readonly withCredentials: boolean;
-    close(): void;
-}
-
-declare var EventSource: {
-    prototype: EventSource;
-    new(url: string, eventSourceInitDict?: EventSourceInit): EventSource;
-};
-
-interface EventSourceInit {
-    readonly withCredentials: boolean;
-}
-
-interface EventTarget {
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject | null, options?: boolean | AddEventListenerOptions): void;
-    dispatchEvent(evt: Event): boolean;
-    removeEventListener(type: string, listener?: EventListenerOrEventListenerObject | null, options?: EventListenerOptions | boolean): void;
-}
-
-declare var EventTarget: {
-    prototype: EventTarget;
-    new(): EventTarget;
-};
-
-interface ExtensionScriptApis {
-    extensionIdToShortId(extensionId: string): number;
-    fireExtensionApiTelemetry(functionName: string, isSucceeded: boolean, isSupported: boolean, errorString: string): void;
-    genericFunction(routerAddress: any, parameters?: string, callbackId?: number): void;
-    genericSynchronousFunction(functionId: number, parameters?: string): string;
-    genericWebRuntimeCallout(to: any, from: any, payload: string): void;
-    getExtensionId(): string;
-    registerGenericFunctionCallbackHandler(callbackHandler: Function): void;
-    registerGenericPersistentCallbackHandler(callbackHandler: Function): void;
-    registerWebRuntimeCallbackHandler(handler: Function): any;
-}
-
-declare var ExtensionScriptApis: {
-    prototype: ExtensionScriptApis;
-    new(): ExtensionScriptApis;
-};
-
-interface External {
-}
-
-declare var External: {
-    prototype: External;
-    new(): External;
-};
-
-interface File extends Blob {
-    readonly lastModified: number;
-    /** @deprecated */
-    readonly lastModifiedDate: Date;
-    readonly name: string;
-    readonly webkitRelativePath: string;
-}
-
-declare var File: {
-    prototype: File;
-    new (parts: (ArrayBuffer | ArrayBufferView | Blob | string)[], filename: string, properties?: FilePropertyBag): File;
-};
-
-interface FileList {
-    readonly length: number;
-    item(index: number): File | null;
-    [index: number]: File;
-}
-
-declare var FileList: {
-    prototype: FileList;
-    new(): FileList;
-};
-
-interface FilePropertyBag extends BlobPropertyBag {
-    lastModified?: number;
-}
-
-interface FileReaderEventMap {
-    "abort": ProgressEvent;
-    "error": ProgressEvent;
-    "load": ProgressEvent;
-    "loadend": ProgressEvent;
-    "loadstart": ProgressEvent;
-    "progress": ProgressEvent;
-}
-
-interface FileReader extends EventTarget {
-    readonly error: DOMException | null;
-    onabort: ((this: FileReader, ev: FileReaderProgressEvent) => any) | null;
-    onerror: ((this: FileReader, ev: FileReaderProgressEvent) => any) | null;
-    onload: ((this: FileReader, ev: FileReaderProgressEvent) => any) | null;
-    onloadend: ((this: FileReader, ev: FileReaderProgressEvent) => any) | null;
-    onloadstart: ((this: FileReader, ev: FileReaderProgressEvent) => any) | null;
-    onprogress: ((this: FileReader, ev: FileReaderProgressEvent) => any) | null;
-    readonly readyState: number;
-    readonly result: any;
-    abort(): void;
-    readAsArrayBuffer(blob: Blob): void;
-    readAsBinaryString(blob: Blob): void;
-    readAsDataURL(blob: Blob): void;
-    readAsText(blob: Blob, label?: string): void;
-    readonly DONE: number;
-    readonly EMPTY: number;
-    readonly LOADING: number;
-    addEventListener<K extends keyof FileReaderEventMap>(type: K, listener: (this: FileReader, ev: FileReaderEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof FileReaderEventMap>(type: K, listener: (this: FileReader, ev: FileReaderEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var FileReader: {
-    prototype: FileReader;
-    new(): FileReader;
-    readonly DONE: number;
-    readonly EMPTY: number;
-    readonly LOADING: number;
-};
-
-interface FileReaderProgressEvent extends ProgressEvent {
-    readonly target: FileReader | null;
-}
-
-interface FocusEvent extends UIEvent {
-    readonly relatedTarget: EventTarget;
-    initFocusEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number, relatedTargetArg: EventTarget): void;
-}
-
-declare var FocusEvent: {
-    prototype: FocusEvent;
-    new(typeArg: string, eventInitDict?: FocusEventInit): FocusEvent;
-};
-
-interface FocusNavigationEvent extends Event {
-    readonly navigationReason: NavigationReason;
-    readonly originHeight: number;
-    readonly originLeft: number;
-    readonly originTop: number;
-    readonly originWidth: number;
-    requestFocus(): void;
-}
-
-declare var FocusNavigationEvent: {
-    prototype: FocusNavigationEvent;
-    new(type: string, eventInitDict?: FocusNavigationEventInit): FocusNavigationEvent;
-};
-
-interface FormData {
-    append(name: string, value: string | Blob, fileName?: string): void;
-    delete(name: string): void;
-    get(name: string): FormDataEntryValue | null;
-    getAll(name: string): FormDataEntryValue[];
-    has(name: string): boolean;
-    set(name: string, value: string | Blob, fileName?: string): void;
-}
-
-declare var FormData: {
-    prototype: FormData;
-    new(): FormData;
-    new(form: HTMLFormElement): FormData;
-};
-
-interface GainNode extends AudioNode {
-    readonly gain: AudioParam;
-}
-
-declare var GainNode: {
-    prototype: GainNode;
-    new(): GainNode;
-};
-
-interface Gamepad {
-    readonly axes: number[];
-    readonly buttons: GamepadButton[];
-    readonly connected: boolean;
-    readonly displayId: number;
-    readonly hand: GamepadHand;
-    readonly hapticActuators: GamepadHapticActuator[];
-    readonly id: string;
-    readonly index: number;
-    readonly mapping: GamepadMappingType;
-    readonly pose: GamepadPose | null;
-    readonly timestamp: number;
-}
-
-declare var Gamepad: {
-    prototype: Gamepad;
-    new(): Gamepad;
-};
-
-interface GamepadButton {
-    readonly pressed: boolean;
-    readonly touched: boolean;
-    readonly value: number;
-}
-
-declare var GamepadButton: {
-    prototype: GamepadButton;
-    new(): GamepadButton;
-};
-
-interface GamepadEvent extends Event {
-    readonly gamepad: Gamepad;
-}
-
-declare var GamepadEvent: {
-    prototype: GamepadEvent;
-    new(typeArg: string, eventInitDict?: GamepadEventInit): GamepadEvent;
-};
-
-interface GamepadHapticActuator {
-    readonly type: GamepadHapticActuatorType;
-    pulse(value: number, duration: number): Promise<boolean>;
-}
-
-declare var GamepadHapticActuator: {
-    prototype: GamepadHapticActuator;
-    new(): GamepadHapticActuator;
-};
-
-interface GamepadPose {
-    readonly angularAcceleration: Float32Array | null;
-    readonly angularVelocity: Float32Array | null;
-    readonly hasOrientation: boolean;
-    readonly hasPosition: boolean;
-    readonly linearAcceleration: Float32Array | null;
-    readonly linearVelocity: Float32Array | null;
-    readonly orientation: Float32Array | null;
-    readonly position: Float32Array | null;
-}
-
-declare var GamepadPose: {
-    prototype: GamepadPose;
-    new(): GamepadPose;
-};
-
-interface Geolocation {
-    clearWatch(watchId: number): void;
-    getCurrentPosition(successCallback: PositionCallback, errorCallback?: PositionErrorCallback, options?: PositionOptions): void;
-    watchPosition(successCallback: PositionCallback, errorCallback?: PositionErrorCallback, options?: PositionOptions): number;
-}
-
-declare var Geolocation: {
-    prototype: Geolocation;
-    new(): Geolocation;
-};
-
-interface GetSVGDocument {
-    getSVGDocument(): Document;
-}
-
-interface GlobalEventHandlersEventMap {
-    "pointercancel": PointerEvent;
-    "pointerdown": PointerEvent;
-    "pointerenter": PointerEvent;
-    "pointerleave": PointerEvent;
-    "pointermove": PointerEvent;
-    "pointerout": PointerEvent;
-    "pointerover": PointerEvent;
-    "pointerup": PointerEvent;
-    "wheel": WheelEvent;
-}
-
-interface GlobalEventHandlers {
-    onpointercancel: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
-    onpointerdown: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
-    onpointerenter: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
-    onpointerleave: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
-    onpointermove: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
-    onpointerout: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
-    onpointerover: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
-    onpointerup: ((this: GlobalEventHandlers, ev: PointerEvent) => any) | null;
-    onwheel: ((this: GlobalEventHandlers, ev: WheelEvent) => any) | null;
-    addEventListener<K extends keyof GlobalEventHandlersEventMap>(type: K, listener: (this: GlobalEventHandlers, ev: GlobalEventHandlersEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof GlobalEventHandlersEventMap>(type: K, listener: (this: GlobalEventHandlers, ev: GlobalEventHandlersEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-interface GlobalFetch {
-    fetch(input?: Request | string, init?: RequestInit): Promise<Response>;
-}
-
-interface HTMLAllCollection {
-    readonly length: number;
-    item(nameOrIndex?: string): HTMLCollection | Element | null;
-    namedItem(name: string): HTMLCollection | Element | null;
-    [index: number]: Element;
-}
-
-declare var HTMLAllCollection: {
-    prototype: HTMLAllCollection;
-    new(): HTMLAllCollection;
-};
-
-interface HTMLAnchorElement extends HTMLElement, HTMLHyperlinkElementUtils {
-    Methods: string;
-    /**
-     * Sets or retrieves the character set used to encode the object.
-     */
-    /** @deprecated */
-    charset: string;
-    /**
-     * Sets or retrieves the coordinates of the object.
-     */
-    /** @deprecated */
-    coords: string;
-    download: string;
-    /**
-     * Sets or retrieves the language code of the object.
-     */
-    hreflang: string;
-    readonly mimeType: string;
-    /**
-     * Sets or retrieves the shape of the object.
-     */
-    /** @deprecated */
-    name: string;
-    readonly nameProp: string;
-    readonly protocolLong: string;
-    /**
-     * Sets or retrieves the relationship between the object and the destination of the link.
-     */
-    rel: string;
-    /**
-     * Sets or retrieves the relationship between the object and the destination of the link.
-     */
-    /** @deprecated */
-    rev: string;
-    /**
-     * Sets or retrieves the shape of the object.
-     */
-    /** @deprecated */
-    shape: string;
-    /**
-     * Sets or retrieves the window or frame at which to target content.
-     */
-    target: string;
-    /**
-     * Retrieves or sets the text of the object as a string.
-     */
-    text: string;
-    type: string;
-    urn: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLAnchorElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLAnchorElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLAnchorElement: {
-    prototype: HTMLAnchorElement;
-    new(): HTMLAnchorElement;
-};
-
-interface HTMLAppletElement extends HTMLElement {
-    /** @deprecated */
-    align: string;
-    /**
-     * Sets or retrieves a text alternative to the graphic.
-     */
-    /** @deprecated */
-    alt: string;
-    /**
-     * Sets or retrieves a character string that can be used to implement your own archive functionality for the object.
-     */
-    /** @deprecated */
-    archive: string;
-    /** @deprecated */
-    code: string;
-    /**
-     * Sets or retrieves the URL of the component.
-     */
-    /** @deprecated */
-    codeBase: string;
-    readonly form: HTMLFormElement | null;
-    /**
-     * Sets or retrieves the height of the object.
-     */
-    /** @deprecated */
-    height: string;
-    /** @deprecated */
-    hspace: number;
-    /**
-     * Sets or retrieves the shape of the object.
-     */
-    /** @deprecated */
-    name: string;
-    /** @deprecated */
-    object: string;
-    /** @deprecated */
-    vspace: number;
-    /** @deprecated */
-    width: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLAppletElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLAppletElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLAppletElement: {
-    prototype: HTMLAppletElement;
-    new(): HTMLAppletElement;
-};
-
-interface HTMLAreaElement extends HTMLElement, HTMLHyperlinkElementUtils {
-    /**
-     * Sets or retrieves a text alternative to the graphic.
-     */
-    alt: string;
-    /**
-     * Sets or retrieves the coordinates of the object.
-     */
-    coords: string;
-    download: string;
-    /**
-     * Sets or gets whether clicks in this region cause action.
-     */
-    /** @deprecated */
-    noHref: boolean;
-    rel: string;
-    /**
-     * Sets or retrieves the shape of the object.
-     */
-    shape: string;
-    /**
-     * Sets or retrieves the window or frame at which to target content.
-     */
-    target: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLAreaElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLAreaElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLAreaElement: {
-    prototype: HTMLAreaElement;
-    new(): HTMLAreaElement;
-};
-
-interface HTMLAreasCollection extends HTMLCollectionBase {
-}
-
-declare var HTMLAreasCollection: {
-    prototype: HTMLAreasCollection;
-    new(): HTMLAreasCollection;
-};
-
-interface HTMLAudioElement extends HTMLMediaElement {
-    addEventListener<K extends keyof HTMLMediaElementEventMap>(type: K, listener: (this: HTMLAudioElement, ev: HTMLMediaElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLMediaElementEventMap>(type: K, listener: (this: HTMLAudioElement, ev: HTMLMediaElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLAudioElement: {
-    prototype: HTMLAudioElement;
-    new(): HTMLAudioElement;
-};
-
-interface HTMLBRElement extends HTMLElement {
-    /**
-     * Sets or retrieves the side on which floating objects are not to be positioned when any IHTMLBlockElement is inserted into the document.
-     */
-    /** @deprecated */
-    clear: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLBRElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLBRElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLBRElement: {
-    prototype: HTMLBRElement;
-    new(): HTMLBRElement;
-};
-
-interface HTMLBaseElement extends HTMLElement {
-    /**
-     * Gets or sets the baseline URL on which relative links are based.
-     */
-    href: string;
-    /**
-     * Sets or retrieves the window or frame at which to target content.
-     */
-    target: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLBaseElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLBaseElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLBaseElement: {
-    prototype: HTMLBaseElement;
-    new(): HTMLBaseElement;
-};
-
-interface HTMLBaseFontElement extends HTMLElement, DOML2DeprecatedColorProperty {
-    /**
-     * Sets or retrieves the current typeface family.
-     */
-    /** @deprecated */
-    face: string;
-    /**
-     * Sets or retrieves the font size of the object.
-     */
-    /** @deprecated */
-    size: number;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLBaseFontElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLBaseFontElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLBaseFontElement: {
-    prototype: HTMLBaseFontElement;
-    new(): HTMLBaseFontElement;
-};
-
-interface HTMLBodyElementEventMap extends HTMLElementEventMap, WindowEventHandlersEventMap {
-    "blur": FocusEvent;
-    "error": ErrorEvent;
-    "focus": FocusEvent;
-    "load": Event;
-    "orientationchange": Event;
-    "resize": UIEvent;
-    "scroll": UIEvent;
-}
-
-interface HTMLBodyElement extends HTMLElement, WindowEventHandlers {
-    /** @deprecated */
-    aLink: string;
-    /** @deprecated */
-    background: string;
-    /** @deprecated */
-    bgColor: string;
-    bgProperties: string;
-    /** @deprecated */
-    link: string;
-    /** @deprecated */
-    noWrap: boolean;
-    onorientationchange: ((this: HTMLBodyElement, ev: Event) => any) | null;
-    onresize: ((this: HTMLBodyElement, ev: UIEvent) => any) | null;
-    /** @deprecated */
-    text: string;
-    /** @deprecated */
-    vLink: string;
-    addEventListener<K extends keyof HTMLBodyElementEventMap>(type: K, listener: (this: HTMLBodyElement, ev: HTMLBodyElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLBodyElementEventMap>(type: K, listener: (this: HTMLBodyElement, ev: HTMLBodyElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLBodyElement: {
-    prototype: HTMLBodyElement;
-    new(): HTMLBodyElement;
-};
-
-interface HTMLButtonElement extends HTMLElement {
-    /**
-     * Provides a way to direct a user to a specific field when a document loads. This can provide both direction and convenience for a user, reducing the need to click or tab to a field when a page opens. This attribute is true when present on an element, and false when missing.
-     */
-    autofocus: boolean;
-    disabled: boolean;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Overrides the action attribute (where the data on a form is sent) on the parent form element.
-     */
-    formAction: string;
-    /**
-     * Used to override the encoding (formEnctype attribute) specified on the form element.
-     */
-    formEnctype: string;
-    /**
-     * Overrides the submit method attribute previously specified on a form element.
-     */
-    formMethod: string;
-    /**
-     * Overrides any validation or required attributes on a form or form elements to allow it to be submitted without validation. This can be used to create a "save draft"-type submit option.
-     */
-    formNoValidate: boolean;
-    /**
-     * Overrides the target attribute on a form element.
-     */
-    formTarget: string;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    name: string;
-    status: any;
-    /**
-     * Gets the classification and default behavior of the button.
-     */
-    type: string;
-    /**
-     * Returns the error message that would be displayed if the user submits the form, or an empty string if no error message. It also triggers the standard error message, such as "this is a required field". The result is that the user sees validation messages without actually submitting.
-     */
-    readonly validationMessage: string;
-    /**
-     * Returns a  ValidityState object that represents the validity states of an element.
-     */
-    readonly validity: ValidityState;
-    /**
-     * Sets or retrieves the default or selected value of the control.
-     */
-    value: string;
-    /**
-     * Returns whether an element will successfully validate based on forms validation rules and constraints.
-     */
-    readonly willValidate: boolean;
-    /**
-     * Returns whether a form will validate when it is submitted, without having to submit it.
-     */
-    checkValidity(): boolean;
-    /**
-     * Sets a custom error message that is displayed when a form is submitted.
-     * @param error Sets a custom error message that is displayed when a form is submitted.
-     */
-    setCustomValidity(error: string): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLButtonElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLButtonElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLButtonElement: {
-    prototype: HTMLButtonElement;
-    new(): HTMLButtonElement;
-};
-
-interface HTMLCanvasElement extends HTMLElement {
-    /**
-     * Gets or sets the height of a canvas element on a document.
-     */
-    height: number;
-    /**
-     * Gets or sets the width of a canvas element on a document.
-     */
-    width: number;
-    /**
-     * Returns an object that provides methods and properties for drawing and manipulating images and graphics on a canvas element in a document. A context object includes information about colors, line widths, fonts, and other graphic parameters that can be drawn on a canvas.
-     * @param contextId The identifier (ID) of the type of canvas to create. Internet Explorer 9 and Internet Explorer 10 support only a 2-D context using canvas.getContext("2d"); IE11 Preview also supports 3-D or WebGL context using canvas.getContext("experimental-webgl");
-     */
-    getContext(contextId: "2d", contextAttributes?: Canvas2DContextAttributes): CanvasRenderingContext2D | null;
-    getContext(contextId: "webgl" | "experimental-webgl", contextAttributes?: WebGLContextAttributes): WebGLRenderingContext | null;
-    getContext(contextId: string, contextAttributes?: {}): CanvasRenderingContext2D | WebGLRenderingContext | null;
-    /**
-     * Returns a blob object encoded as a Portable Network Graphics (PNG) format from a canvas image or drawing.
-     */
-    msToBlob(): Blob;
-    toBlob(callback: (result: Blob | null) => void, type?: string, ...arguments: any[]): void;
-    /**
-     * Returns the content of the current canvas as an image that you can use as a source for another canvas or an HTML element.
-     * @param type The standard MIME type for the image format to return. If you do not specify this parameter, the default value is a PNG format image.
-     */
-    toDataURL(type?: string, ...args: any[]): string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLCanvasElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLCanvasElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLCanvasElement: {
-    prototype: HTMLCanvasElement;
-    new(): HTMLCanvasElement;
-};
-
-interface HTMLCollectionBase {
-    /**
-     * Sets or retrieves the number of objects in a collection.
-     */
-    readonly length: number;
-    /**
-     * Retrieves an object from various collections.
-     */
-    item(index: number): Element;
-    [index: number]: Element;
-}
-
-interface HTMLCollection extends HTMLCollectionBase {
-    /**
-     * Retrieves a select object or an object from an options collection.
-     */
-    namedItem(name: string): Element | null;
-}
-
-declare var HTMLCollection: {
-    prototype: HTMLCollection;
-    new(): HTMLCollection;
-};
-
-interface HTMLCollectionOf<T extends Element> extends HTMLCollectionBase {
-    item(index: number): T;
-    namedItem(name: string): T;
-    [index: number]: T;
-}
-
-interface HTMLDListElement extends HTMLElement {
-    /** @deprecated */
-    compact: boolean;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDListElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDListElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLDListElement: {
-    prototype: HTMLDListElement;
-    new(): HTMLDListElement;
-};
-
-interface HTMLDataElement extends HTMLElement {
-    value: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDataElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDataElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLDataElement: {
-    prototype: HTMLDataElement;
-    new(): HTMLDataElement;
-};
-
-interface HTMLDataListElement extends HTMLElement {
-    readonly options: HTMLCollectionOf<HTMLOptionElement>;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDataListElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDataListElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLDataListElement: {
-    prototype: HTMLDataListElement;
-    new(): HTMLDataListElement;
-};
-
-interface HTMLDetailsElement extends HTMLElement {
-    open: boolean;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDetailsElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDetailsElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLDetailsElement: {
-    prototype: HTMLDetailsElement;
-    new(): HTMLDetailsElement;
-};
-
-interface HTMLDialogElement extends HTMLElement {
-    open: boolean;
-    returnValue: string;
-    close(returnValue?: string): void;
-    show(): void;
-    showModal(): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDialogElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDialogElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLDialogElement: {
-    prototype: HTMLDialogElement;
-    new(): HTMLDialogElement;
-};
-
-interface HTMLDirectoryElement extends HTMLElement {
-    compact: boolean;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDirectoryElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDirectoryElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLDirectoryElement: {
-    prototype: HTMLDirectoryElement;
-    new(): HTMLDirectoryElement;
-};
-
-interface HTMLDivElement extends HTMLElement {
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    /** @deprecated */
-    align: string;
-    /**
-     * Sets or retrieves whether the browser automatically performs wordwrap.
-     */
-    noWrap: boolean;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDivElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLDivElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLDivElement: {
-    prototype: HTMLDivElement;
-    new(): HTMLDivElement;
-};
-
-interface HTMLDocument extends Document {
-    addEventListener<K extends keyof DocumentEventMap>(type: K, listener: (this: HTMLDocument, ev: DocumentEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof DocumentEventMap>(type: K, listener: (this: HTMLDocument, ev: DocumentEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLDocument: {
-    prototype: HTMLDocument;
-    new(): HTMLDocument;
-};
-
-interface HTMLElementEventMap extends ElementEventMap {
-    "abort": UIEvent;
-    "activate": Event;
-    "beforeactivate": Event;
-    "beforecopy": Event;
-    "beforecut": Event;
-    "beforedeactivate": Event;
-    "beforepaste": Event;
-    "blur": FocusEvent;
-    "canplay": Event;
-    "canplaythrough": Event;
-    "change": Event;
-    "click": MouseEvent;
-    "contextmenu": PointerEvent;
-    "copy": ClipboardEvent;
-    "cuechange": Event;
-    "cut": ClipboardEvent;
-    "dblclick": MouseEvent;
-    "deactivate": Event;
-    "drag": DragEvent;
-    "dragend": DragEvent;
-    "dragenter": DragEvent;
-    "dragleave": DragEvent;
-    "dragover": DragEvent;
-    "dragstart": DragEvent;
-    "drop": DragEvent;
-    "durationchange": Event;
-    "emptied": Event;
-    "ended": Event;
-    "error": ErrorEvent;
-    "focus": FocusEvent;
-    "input": Event;
-    "invalid": Event;
-    "keydown": KeyboardEvent;
-    "keypress": KeyboardEvent;
-    "keyup": KeyboardEvent;
-    "load": Event;
-    "loadeddata": Event;
-    "loadedmetadata": Event;
-    "loadstart": Event;
-    "mousedown": MouseEvent;
-    "mouseenter": MouseEvent;
-    "mouseleave": MouseEvent;
-    "mousemove": MouseEvent;
-    "mouseout": MouseEvent;
-    "mouseover": MouseEvent;
-    "mouseup": MouseEvent;
-    "mousewheel": WheelEvent;
-    "MSContentZoom": Event;
-    "MSManipulationStateChanged": Event;
-    "paste": ClipboardEvent;
-    "pause": Event;
-    "play": Event;
-    "playing": Event;
-    "progress": ProgressEvent;
-    "ratechange": Event;
-    "reset": Event;
-    "scroll": UIEvent;
-    "seeked": Event;
-    "seeking": Event;
-    "select": UIEvent;
-    "selectstart": Event;
-    "stalled": Event;
-    "submit": Event;
-    "suspend": Event;
-    "timeupdate": Event;
-    "volumechange": Event;
-    "waiting": Event;
-}
-
-interface HTMLElement extends Element, ElementCSSInlineStyle {
-    accessKey: string;
-    contentEditable: string;
-    readonly dataset: DOMStringMap;
-    dir: string;
-    draggable: boolean;
-    hidden: boolean;
-    hideFocus: boolean;
-    innerText: string;
-    readonly isContentEditable: boolean;
-    lang: string;
-    readonly offsetHeight: number;
-    readonly offsetLeft: number;
-    readonly offsetParent: Element;
-    readonly offsetTop: number;
-    readonly offsetWidth: number;
-    onabort: ((this: HTMLElement, ev: UIEvent) => any) | null;
-    onactivate: ((this: HTMLElement, ev: Event) => any) | null;
-    onbeforeactivate: ((this: HTMLElement, ev: Event) => any) | null;
-    onbeforecopy: ((this: HTMLElement, ev: Event) => any) | null;
-    onbeforecut: ((this: HTMLElement, ev: Event) => any) | null;
-    onbeforedeactivate: ((this: HTMLElement, ev: Event) => any) | null;
-    onbeforepaste: ((this: HTMLElement, ev: Event) => any) | null;
-    onblur: ((this: HTMLElement, ev: FocusEvent) => any) | null;
-    oncanplay: ((this: HTMLElement, ev: Event) => any) | null;
-    oncanplaythrough: ((this: HTMLElement, ev: Event) => any) | null;
-    onchange: ((this: HTMLElement, ev: Event) => any) | null;
-    onclick: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    oncontextmenu: ((this: HTMLElement, ev: PointerEvent) => any) | null;
-    oncopy: ((this: HTMLElement, ev: ClipboardEvent) => any) | null;
-    oncuechange: ((this: HTMLElement, ev: Event) => any) | null;
-    oncut: ((this: HTMLElement, ev: ClipboardEvent) => any) | null;
-    ondblclick: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    ondeactivate: ((this: HTMLElement, ev: Event) => any) | null;
-    ondrag: ((this: HTMLElement, ev: DragEvent) => any) | null;
-    ondragend: ((this: HTMLElement, ev: DragEvent) => any) | null;
-    ondragenter: ((this: HTMLElement, ev: DragEvent) => any) | null;
-    ondragleave: ((this: HTMLElement, ev: DragEvent) => any) | null;
-    ondragover: ((this: HTMLElement, ev: DragEvent) => any) | null;
-    ondragstart: ((this: HTMLElement, ev: DragEvent) => any) | null;
-    ondrop: ((this: HTMLElement, ev: DragEvent) => any) | null;
-    ondurationchange: ((this: HTMLElement, ev: Event) => any) | null;
-    onemptied: ((this: HTMLElement, ev: Event) => any) | null;
-    onended: ((this: HTMLElement, ev: Event) => any) | null;
-    onerror: ((this: HTMLElement, ev: ErrorEvent) => any) | null;
-    onfocus: ((this: HTMLElement, ev: FocusEvent) => any) | null;
-    oninput: ((this: HTMLElement, ev: Event) => any) | null;
-    oninvalid: ((this: HTMLElement, ev: Event) => any) | null;
-    onkeydown: ((this: HTMLElement, ev: KeyboardEvent) => any) | null;
-    onkeypress: ((this: HTMLElement, ev: KeyboardEvent) => any) | null;
-    onkeyup: ((this: HTMLElement, ev: KeyboardEvent) => any) | null;
-    onload: ((this: HTMLElement, ev: Event) => any) | null;
-    onloadeddata: ((this: HTMLElement, ev: Event) => any) | null;
-    onloadedmetadata: ((this: HTMLElement, ev: Event) => any) | null;
-    onloadstart: ((this: HTMLElement, ev: Event) => any) | null;
-    onmousedown: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    onmouseenter: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    onmouseleave: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    onmousemove: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    onmouseout: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    onmouseover: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    onmouseup: ((this: HTMLElement, ev: MouseEvent) => any) | null;
-    onmousewheel: ((this: HTMLElement, ev: WheelEvent) => any) | null;
-    onmscontentzoom: ((this: HTMLElement, ev: Event) => any) | null;
-    onmsmanipulationstatechanged: ((this: HTMLElement, ev: Event) => any) | null;
-    onpaste: ((this: HTMLElement, ev: ClipboardEvent) => any) | null;
-    onpause: ((this: HTMLElement, ev: Event) => any) | null;
-    onplay: ((this: HTMLElement, ev: Event) => any) | null;
-    onplaying: ((this: HTMLElement, ev: Event) => any) | null;
-    onprogress: ((this: HTMLElement, ev: ProgressEvent) => any) | null;
-    onratechange: ((this: HTMLElement, ev: Event) => any) | null;
-    onreset: ((this: HTMLElement, ev: Event) => any) | null;
-    onscroll: ((this: HTMLElement, ev: UIEvent) => any) | null;
-    onseeked: ((this: HTMLElement, ev: Event) => any) | null;
-    onseeking: ((this: HTMLElement, ev: Event) => any) | null;
-    onselect: ((this: HTMLElement, ev: UIEvent) => any) | null;
-    onselectstart: ((this: HTMLElement, ev: Event) => any) | null;
-    onstalled: ((this: HTMLElement, ev: Event) => any) | null;
-    onsubmit: ((this: HTMLElement, ev: Event) => any) | null;
-    onsuspend: ((this: HTMLElement, ev: Event) => any) | null;
-    ontimeupdate: ((this: HTMLElement, ev: Event) => any) | null;
-    onvolumechange: ((this: HTMLElement, ev: Event) => any) | null;
-    onwaiting: ((this: HTMLElement, ev: Event) => any) | null;
-    outerText: string;
-    spellcheck: boolean;
-    tabIndex: number;
-    title: string;
-    animate(keyframes: AnimationKeyFrame | AnimationKeyFrame[], options: number | AnimationOptions): Animation;
-    blur(): void;
-    click(): void;
-    dragDrop(): boolean;
-    focus(): void;
-    msGetInputContext(): MSInputMethodContext;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLElement: {
-    prototype: HTMLElement;
-    new(): HTMLElement;
-};
-
-interface HTMLEmbedElement extends HTMLElement, GetSVGDocument {
-    /**
-     * Sets or retrieves the height of the object.
-     */
-    height: string;
-    hidden: any;
-    /**
-     * Gets or sets whether the DLNA PlayTo device is available.
-     */
-    msPlayToDisabled: boolean;
-    /**
-     * Gets or sets the path to the preferred media source. This enables the Play To target device to stream the media content, which can be DRM protected, from a different location, such as a cloud media server.
-     */
-    msPlayToPreferredSourceUri: string;
-    /**
-     * Gets or sets the primary DLNA PlayTo device.
-     */
-    msPlayToPrimary: boolean;
-    /**
-     * Gets the source associated with the media element for use by the PlayToManager.
-     */
-    readonly msPlayToSource: any;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    /** @deprecated */
-    name: string;
-    /**
-     * Retrieves the palette used for the embedded document.
-     */
-    readonly palette: string;
-    /**
-     * Retrieves the URL of the plug-in used to view an embedded document.
-     */
-    readonly pluginspage: string;
-    readonly readyState: string;
-    /**
-     * Sets or retrieves a URL to be loaded by the object.
-     */
-    src: string;
-    /**
-     * Sets or retrieves the height and width units of the embed object.
-     */
-    units: string;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    width: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLEmbedElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLEmbedElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLEmbedElement: {
-    prototype: HTMLEmbedElement;
-    new(): HTMLEmbedElement;
-};
-
-interface HTMLFieldSetElement extends HTMLElement {
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    align: string;
-    disabled: boolean;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    name: string;
-    /**
-     * Returns the error message that would be displayed if the user submits the form, or an empty string if no error message. It also triggers the standard error message, such as "this is a required field". The result is that the user sees validation messages without actually submitting.
-     */
-    readonly validationMessage: string;
-    /**
-     * Returns a  ValidityState object that represents the validity states of an element.
-     */
-    readonly validity: ValidityState;
-    /**
-     * Returns whether an element will successfully validate based on forms validation rules and constraints.
-     */
-    readonly willValidate: boolean;
-    /**
-     * Returns whether a form will validate when it is submitted, without having to submit it.
-     */
-    checkValidity(): boolean;
-    /**
-     * Sets a custom error message that is displayed when a form is submitted.
-     * @param error Sets a custom error message that is displayed when a form is submitted.
-     */
-    setCustomValidity(error: string): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLFieldSetElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLFieldSetElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLFieldSetElement: {
-    prototype: HTMLFieldSetElement;
-    new(): HTMLFieldSetElement;
-};
-
-interface HTMLFontElement extends HTMLElement, DOML2DeprecatedColorProperty, DOML2DeprecatedSizeProperty {
-    /**
-     * Sets or retrieves the current typeface family.
-     */
-    /** @deprecated */
-    face: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLFontElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLFontElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLFontElement: {
-    prototype: HTMLFontElement;
-    new(): HTMLFontElement;
-};
-
-interface HTMLFormControlsCollection extends HTMLCollectionBase {
-    namedItem(name: string): HTMLCollection | Element | null;
-}
-
-declare var HTMLFormControlsCollection: {
-    prototype: HTMLFormControlsCollection;
-    new(): HTMLFormControlsCollection;
-};
-
-interface HTMLFormElement extends HTMLElement {
-    /**
-     * Sets or retrieves a list of character encodings for input data that must be accepted by the server processing the form.
-     */
-    acceptCharset: string;
-    /**
-     * Sets or retrieves the URL to which the form content is sent for processing.
-     */
-    action: string;
-    /**
-     * Specifies whether autocomplete is applied to an editable text field.
-     */
-    autocomplete: string;
-    /**
-     * Retrieves a collection, in source order, of all controls in a given form.
-     */
-    readonly elements: HTMLFormControlsCollection;
-    /**
-     * Sets or retrieves the MIME encoding for the form.
-     */
-    encoding: string;
-    /**
-     * Sets or retrieves the encoding type for the form.
-     */
-    enctype: string;
-    /**
-     * Sets or retrieves the number of objects in a collection.
-     */
-    readonly length: number;
-    /**
-     * Sets or retrieves how to send the form data to the server.
-     */
-    method: string;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    name: string;
-    /**
-     * Designates a form that is not validated when submitted.
-     */
-    noValidate: boolean;
-    /**
-     * Sets or retrieves the window or frame at which to target content.
-     */
-    target: string;
-    /**
-     * Returns whether a form will validate when it is submitted, without having to submit it.
-     */
-    checkValidity(): boolean;
-    /**
-     * Retrieves a form object or an object from an elements collection.
-     * @param name Variant of type Number or String that specifies the object or collection to retrieve. If this parameter is a Number, it is the zero-based index of the object. If this parameter is a string, all objects with matching name or id properties are retrieved, and a collection is returned if more than one match is made.
-     * @param index Variant of type Number that specifies the zero-based index of the object to retrieve when a collection is returned.
-     */
-    item(name?: any, index?: any): any;
-    /**
-     * Retrieves a form object or an object from an elements collection.
-     */
-    namedItem(name: string): any;
-    reportValidity(): boolean;
-    /**
-     * Fires when the user resets a form.
-     */
-    reset(): void;
-    /**
-     * Fires when a FORM is about to be submitted.
-     */
-    submit(): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLFormElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLFormElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-    [name: string]: any;
-}
-
-declare var HTMLFormElement: {
-    prototype: HTMLFormElement;
-    new(): HTMLFormElement;
-};
-
-interface HTMLFrameElementEventMap extends HTMLElementEventMap {
-    "load": Event;
-}
-
-interface HTMLFrameElement extends HTMLElement, GetSVGDocument {
-    /**
-     * Specifies the properties of a border drawn around an object.
-     */
-    border: string;
-    /**
-     * Sets or retrieves the border color of the object.
-     */
-    borderColor: any;
-    /**
-     * Retrieves the document object of the page or frame.
-     */
-    /** @deprecated */
-    readonly contentDocument: Document | null;
-    /**
-     * Retrieves the object of the specified.
-     */
-    /** @deprecated */
-    readonly contentWindow: Window | null;
-    /**
-     * Sets or retrieves whether to display a border for the frame.
-     */
-    /** @deprecated */
-    frameBorder: string;
-    /**
-     * Sets or retrieves the amount of additional space between the frames.
-     */
-    frameSpacing: any;
-    /**
-     * Sets or retrieves the height of the object.
-     */
-    height: string | number;
-    /**
-     * Sets or retrieves a URI to a long description of the object.
-     */
-    /** @deprecated */
-    longDesc: string;
-    /**
-     * Sets or retrieves the top and bottom margin heights before displaying the text in a frame.
-     */
-    /** @deprecated */
-    marginHeight: string;
-    /**
-     * Sets or retrieves the left and right margin widths before displaying the text in a frame.
-     */
-    /** @deprecated */
-    marginWidth: string;
-    /**
-     * Sets or retrieves the frame name.
-     */
-    /** @deprecated */
-    name: string;
-    /**
-     * Sets or retrieves whether the user can resize the frame.
-     */
-    /** @deprecated */
-    noResize: boolean;
-    /**
-     * Sets or retrieves whether the frame can be scrolled.
-     */
-    /** @deprecated */
-    scrolling: string;
-    /**
-     * Sets or retrieves a URL to be loaded by the object.
-     */
-    /** @deprecated */
-    src: string;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    width: string | number;
-    addEventListener<K extends keyof HTMLFrameElementEventMap>(type: K, listener: (this: HTMLFrameElement, ev: HTMLFrameElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLFrameElementEventMap>(type: K, listener: (this: HTMLFrameElement, ev: HTMLFrameElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLFrameElement: {
-    prototype: HTMLFrameElement;
-    new(): HTMLFrameElement;
-};
-
-interface HTMLFrameSetElementEventMap extends HTMLElementEventMap, WindowEventHandlersEventMap {
-    "blur": FocusEvent;
-    "error": ErrorEvent;
-    "focus": FocusEvent;
-    "load": Event;
-    "orientationchange": Event;
-    "resize": UIEvent;
-    "scroll": UIEvent;
-}
-
-interface HTMLFrameSetElement extends HTMLElement, WindowEventHandlers {
-    /**
-     * Sets or retrieves the frame widths of the object.
-     */
-    /** @deprecated */
-    cols: string;
-    name: string;
-    onorientationchange: ((this: HTMLFrameSetElement, ev: Event) => any) | null;
-    onresize: ((this: HTMLFrameSetElement, ev: UIEvent) => any) | null;
-    /**
-     * Sets or retrieves the frame heights of the object.
-     */
-    /** @deprecated */
-    rows: string;
-    addEventListener<K extends keyof HTMLFrameSetElementEventMap>(type: K, listener: (this: HTMLFrameSetElement, ev: HTMLFrameSetElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLFrameSetElementEventMap>(type: K, listener: (this: HTMLFrameSetElement, ev: HTMLFrameSetElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLFrameSetElement: {
-    prototype: HTMLFrameSetElement;
-    new(): HTMLFrameSetElement;
-};
-
-interface HTMLHRElement extends HTMLElement, DOML2DeprecatedColorProperty, DOML2DeprecatedSizeProperty {
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    /** @deprecated */
-    align: string;
-    /**
-     * Sets or retrieves whether the horizontal rule is drawn with 3-D shading.
-     */
-    /** @deprecated */
-    noShade: boolean;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    /** @deprecated */
-    width: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLHRElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLHRElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLHRElement: {
-    prototype: HTMLHRElement;
-    new(): HTMLHRElement;
-};
-
-interface HTMLHeadElement extends HTMLElement {
-    /** @deprecated */
-    profile: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLHeadElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLHeadElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLHeadElement: {
-    prototype: HTMLHeadElement;
-    new(): HTMLHeadElement;
-};
-
-interface HTMLHeadingElement extends HTMLElement {
-    /**
-     * Sets or retrieves a value that indicates the table alignment.
-     */
-    /** @deprecated */
-    align: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLHeadingElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLHeadingElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLHeadingElement: {
-    prototype: HTMLHeadingElement;
-    new(): HTMLHeadingElement;
-};
-
-interface HTMLHtmlElement extends HTMLElement {
-    /**
-     * Sets or retrieves the DTD version that governs the current document.
-     */
-    /** @deprecated */
-    version: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLHtmlElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLHtmlElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLHtmlElement: {
-    prototype: HTMLHtmlElement;
-    new(): HTMLHtmlElement;
-};
-
-interface HTMLHyperlinkElementUtils {
-    hash: string;
-    host: string;
-    hostname: string;
-    href: string;
-    origin: string;
-    pathname: string;
-    port: string;
-    protocol: string;
-    search: string;
-    toString(): string;
-}
-
-interface HTMLIFrameElementEventMap extends HTMLElementEventMap {
-    "load": Event;
-}
-
-interface HTMLIFrameElement extends HTMLElement, GetSVGDocument {
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    /** @deprecated */
-    align: string;
-    allowFullscreen: boolean;
-    allowPaymentRequest: boolean;
-    /**
-     * Retrieves the document object of the page or frame.
-     */
-    readonly contentDocument: Document | null;
-    /**
-     * Retrieves the object of the specified.
-     */
-    readonly contentWindow: Window | null;
-    /**
-     * Sets or retrieves whether to display a border for the frame.
-     */
-    /** @deprecated */
-    frameBorder: string;
-    /**
-     * Sets or retrieves the height of the object.
-     */
-    height: string;
-    /**
-     * Sets or retrieves a URI to a long description of the object.
-     */
-    /** @deprecated */
-    longDesc: string;
-    /**
-     * Sets or retrieves the top and bottom margin heights before displaying the text in a frame.
-     */
-    /** @deprecated */
-    marginHeight: string;
-    /**
-     * Sets or retrieves the left and right margin widths before displaying the text in a frame.
-     */
-    /** @deprecated */
-    marginWidth: string;
-    /**
-     * Sets or retrieves the frame name.
-     */
-    name: string;
-    readonly sandbox: DOMTokenList;
-    /**
-     * Sets or retrieves whether the frame can be scrolled.
-     */
-    /** @deprecated */
-    scrolling: string;
-    /**
-     * Sets or retrieves a URL to be loaded by the object.
-     */
-    src: string;
-    /**
-     * Sets or retrives the content of the page that is to contain.
-     */
-    srcdoc: string;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    width: string;
-    addEventListener<K extends keyof HTMLIFrameElementEventMap>(type: K, listener: (this: HTMLIFrameElement, ev: HTMLIFrameElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLIFrameElementEventMap>(type: K, listener: (this: HTMLIFrameElement, ev: HTMLIFrameElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLIFrameElement: {
-    prototype: HTMLIFrameElement;
-    new(): HTMLIFrameElement;
-};
-
-interface HTMLImageElement extends HTMLElement {
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    /** @deprecated */
-    align: string;
-    /**
-     * Sets or retrieves a text alternative to the graphic.
-     */
-    alt: string;
-    /**
-     * Specifies the properties of a border drawn around an object.
-     */
-    /** @deprecated */
-    border: string;
-    /**
-     * Retrieves whether the object is fully loaded.
-     */
-    readonly complete: boolean;
-    crossOrigin: string | null;
-    readonly currentSrc: string;
-    decoding: "async" | "sync" | "auto";
-    /**
-     * Sets or retrieves the height of the object.
-     */
-    height: number;
-    /**
-     * Sets or retrieves the width of the border to draw around the object.
-     */
-    /** @deprecated */
-    hspace: number;
-    /**
-     * Sets or retrieves whether the image is a server-side image map.
-     */
-    isMap: boolean;
-    /**
-     * Sets or retrieves a Uniform Resource Identifier (URI) to a long description of the object.
-     */
-    longDesc: string;
-    /** @deprecated */
-    lowsrc: string;
-    /**
-     * Gets or sets whether the DLNA PlayTo device is available.
-     */
-    msPlayToDisabled: boolean;
-    msPlayToPreferredSourceUri: string;
-    /**
-     * Gets or sets the primary DLNA PlayTo device.
-     */
-    msPlayToPrimary: boolean;
-    /**
-     * Gets the source associated with the media element for use by the PlayToManager.
-     */
-    readonly msPlayToSource: any;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    /** @deprecated */
-    name: string;
-    /**
-     * The original height of the image resource before sizing.
-     */
-    readonly naturalHeight: number;
-    /**
-     * The original width of the image resource before sizing.
-     */
-    readonly naturalWidth: number;
-    sizes: string;
-    /**
-     * The address or URL of the a media resource that is to be considered.
-     */
-    src: string;
-    srcset: string;
-    /**
-     * Sets or retrieves the URL, often with a bookmark extension (#name), to use as a client-side image map.
-     */
-    useMap: string;
-    /**
-     * Sets or retrieves the vertical margin for the object.
-     */
-    /** @deprecated */
-    vspace: number;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    width: number;
-    readonly x: number;
-    readonly y: number;
-    msGetAsCastingSource(): any;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLImageElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLImageElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLImageElement: {
-    prototype: HTMLImageElement;
-    new(): HTMLImageElement;
-};
-
-interface HTMLInputElement extends HTMLElement {
-    /**
-     * Sets or retrieves a comma-separated list of content types.
-     */
-    accept: string;
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    /** @deprecated */
-    align: string;
-    /**
-     * Sets or retrieves a text alternative to the graphic.
-     */
-    alt: string;
-    /**
-     * Specifies whether autocomplete is applied to an editable text field.
-     */
-    autocomplete: string;
-    /**
-     * Provides a way to direct a user to a specific field when a document loads. This can provide both direction and convenience for a user, reducing the need to click or tab to a field when a page opens. This attribute is true when present on an element, and false when missing.
-     */
-    autofocus: boolean;
-    /**
-     * Sets or retrieves the state of the check box or radio button.
-     */
-    checked: boolean;
-    /**
-     * Sets or retrieves the state of the check box or radio button.
-     */
-    defaultChecked: boolean;
-    /**
-     * Sets or retrieves the initial contents of the object.
-     */
-    defaultValue: string;
-    disabled: boolean;
-    /**
-     * Returns a FileList object on a file type input object.
-     */
-    files: FileList | null;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Overrides the action attribute (where the data on a form is sent) on the parent form element.
-     */
-    formAction: string;
-    /**
-     * Used to override the encoding (formEnctype attribute) specified on the form element.
-     */
-    formEnctype: string;
-    /**
-     * Overrides the submit method attribute previously specified on a form element.
-     */
-    formMethod: string;
-    /**
-     * Overrides any validation or required attributes on a form or form elements to allow it to be submitted without validation. This can be used to create a "save draft"-type submit option.
-     */
-    formNoValidate: boolean;
-    /**
-     * Overrides the target attribute on a form element.
-     */
-    formTarget: string;
-    /**
-     * Sets or retrieves the height of the object.
-     */
-    height: number;
-    indeterminate: boolean;
-    /**
-     * Specifies the ID of a pre-defined datalist of options for an input element.
-     */
-    readonly list: HTMLElement | null;
-    /**
-     * Defines the maximum acceptable value for an input element with type="number".When used with the min and step attributes, lets you control the range and increment (such as only even numbers) that the user can enter into an input field.
-     */
-    max: string;
-    /**
-     * Sets or retrieves the maximum number of characters that the user can enter in a text control.
-     */
-    maxLength: number;
-    /**
-     * Defines the minimum acceptable value for an input element with type="number". When used with the max and step attributes, lets you control the range and increment (such as even numbers only) that the user can enter into an input field.
-     */
-    min: string;
-    minLength: number;
-    /**
-     * Sets or retrieves the Boolean value indicating whether multiple items can be selected from a list.
-     */
-    multiple: boolean;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    name: string;
-    /**
-     * Gets or sets a string containing a regular expression that the user's input must match.
-     */
-    pattern: string;
-    /**
-     * Gets or sets a text string that is displayed in an input field as a hint or prompt to users as the format or type of information they need to enter.The text appears in an input field until the user puts focus on the field.
-     */
-    placeholder: string;
-    readOnly: boolean;
-    /**
-     * When present, marks an element that can't be submitted without a value.
-     */
-    required: boolean;
-    selectionDirection: string | null;
-    /**
-     * Gets or sets the end position or offset of a text selection.
-     */
-    selectionEnd: number | null;
-    /**
-     * Gets or sets the starting position or offset of a text selection.
-     */
-    selectionStart: number | null;
-    size: number;
-    /**
-     * The address or URL of the a media resource that is to be considered.
-     */
-    src: string;
-    /**
-     * Defines an increment or jump between values that you want to allow the user to enter. When used with the max and min attributes, lets you control the range and increment (for example, allow only even numbers) that the user can enter into an input field.
-     */
-    step: string;
-    /**
-     * Returns the content type of the object.
-     */
-    type: string;
-    /**
-     * Sets or retrieves the URL, often with a bookmark extension (#name), to use as a client-side image map.
-     */
-    /** @deprecated */
-    useMap: string;
-    /**
-     * Returns the error message that would be displayed if the user submits the form, or an empty string if no error message. It also triggers the standard error message, such as "this is a required field". The result is that the user sees validation messages without actually submitting.
-     */
-    readonly validationMessage: string;
-    /**
-     * Returns a  ValidityState object that represents the validity states of an element.
-     */
-    readonly validity: ValidityState;
-    /**
-     * Returns the value of the data at the cursor's current position.
-     */
-    value: string;
-    valueAsDate: any;
-    /**
-     * Returns the input field value as a number.
-     */
-    valueAsNumber: number;
-    webkitdirectory: boolean;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    width: number;
-    /**
-     * Returns whether an element will successfully validate based on forms validation rules and constraints.
-     */
-    readonly willValidate: boolean;
-    /**
-     * Returns whether a form will validate when it is submitted, without having to submit it.
-     */
-    checkValidity(): boolean;
-    /**
-     * Makes the selection equal to the current object.
-     */
-    select(): void;
-    /**
-     * Sets a custom error message that is displayed when a form is submitted.
-     * @param error Sets a custom error message that is displayed when a form is submitted.
-     */
-    setCustomValidity(error: string): void;
-    /**
-     * Sets the start and end positions of a selection in a text field.
-     * @param start The offset into the text field for the start of the selection.
-     * @param end The offset into the text field for the end of the selection.
-     * @param direction The direction in which the selection is performed.
-     */
-    setSelectionRange(start: number, end: number, direction?: "forward" | "backward" | "none"): void;
-    /**
-     * Decrements a range input control's value by the value given by the Step attribute. If the optional parameter is used, it will decrement the input control's step value multiplied by the parameter's value.
-     * @param n Value to decrement the value by.
-     */
-    stepDown(n?: number): void;
-    /**
-     * Increments a range input control's value by the value given by the Step attribute. If the optional parameter is used, will increment the input control's value by that value.
-     * @param n Value to increment the value by.
-     */
-    stepUp(n?: number): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLInputElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLInputElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLInputElement: {
-    prototype: HTMLInputElement;
-    new(): HTMLInputElement;
-};
-
-interface HTMLLIElement extends HTMLElement {
-    /** @deprecated */
-    type: string;
-    /**
-     * Sets or retrieves the value of a list item.
-     */
-    value: number;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLLIElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLLIElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLLIElement: {
-    prototype: HTMLLIElement;
-    new(): HTMLLIElement;
-};
-
-interface HTMLLabelElement extends HTMLElement {
-    readonly control: HTMLInputElement | null;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Sets or retrieves the object to which the given label object is assigned.
-     */
-    htmlFor: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLLabelElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLLabelElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLLabelElement: {
-    prototype: HTMLLabelElement;
-    new(): HTMLLabelElement;
-};
-
-interface HTMLLegendElement extends HTMLElement {
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    /** @deprecated */
-    align: string;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLLegendElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLLegendElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLLegendElement: {
-    prototype: HTMLLegendElement;
-    new(): HTMLLegendElement;
-};
-
-interface HTMLLinkElement extends HTMLElement, LinkStyle {
-    /**
-     * Sets or retrieves the character set used to encode the object.
-     */
-    /** @deprecated */
-    charset: string;
-    crossOrigin: string | null;
-    /** @deprecated */
-    disabled: boolean;
-    /**
-     * Sets or retrieves a destination URL or an anchor point.
-     */
-    href: string;
-    /**
-     * Sets or retrieves the language code of the object.
-     */
-    hreflang: string;
-    import?: Document;
-    integrity: string;
-    /**
-     * Sets or retrieves the media type.
-     */
-    media: string;
-    /**
-     * Sets or retrieves the relationship between the object and the destination of the link.
-     */
-    rel: string;
-    /**
-     * Sets or retrieves the relationship between the object and the destination of the link.
-     */
-    /** @deprecated */
-    rev: string;
-    /**
-     * Sets or retrieves the window or frame at which to target content.
-     */
-    /** @deprecated */
-    target: string;
-    /**
-     * Sets or retrieves the MIME type of the object.
-     */
-    type: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLLinkElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLLinkElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLLinkElement: {
-    prototype: HTMLLinkElement;
-    new(): HTMLLinkElement;
-};
-
-interface HTMLMainElement extends HTMLElement {
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMainElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMainElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLMainElement: {
-    prototype: HTMLMainElement;
-    new(): HTMLMainElement;
-};
-
-interface HTMLMapElement extends HTMLElement {
-    /**
-     * Retrieves a collection of the area objects defined for the given map object.
-     */
-    readonly areas: HTMLAreasCollection;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    name: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMapElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMapElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLMapElement: {
-    prototype: HTMLMapElement;
-    new(): HTMLMapElement;
-};
-
-interface HTMLMarqueeElementEventMap extends HTMLElementEventMap {
-    "bounce": Event;
-    "finish": Event;
-    "start": Event;
-}
-
-interface HTMLMarqueeElement extends HTMLElement {
-    /** @deprecated */
-    behavior: string;
-    /** @deprecated */
-    bgColor: string;
-    /** @deprecated */
-    direction: string;
-    /** @deprecated */
-    height: string;
-    /** @deprecated */
-    hspace: number;
-    /** @deprecated */
-    loop: number;
-    /** @deprecated */
-    onbounce: ((this: HTMLMarqueeElement, ev: Event) => any) | null;
-    /** @deprecated */
-    onfinish: ((this: HTMLMarqueeElement, ev: Event) => any) | null;
-    /** @deprecated */
-    onstart: ((this: HTMLMarqueeElement, ev: Event) => any) | null;
-    /** @deprecated */
-    scrollAmount: number;
-    /** @deprecated */
-    scrollDelay: number;
-    /** @deprecated */
-    trueSpeed: boolean;
-    /** @deprecated */
-    vspace: number;
-    /** @deprecated */
-    width: string;
-    /** @deprecated */
-    start(): void;
-    /** @deprecated */
-    stop(): void;
-    addEventListener<K extends keyof HTMLMarqueeElementEventMap>(type: K, listener: (this: HTMLMarqueeElement, ev: HTMLMarqueeElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLMarqueeElementEventMap>(type: K, listener: (this: HTMLMarqueeElement, ev: HTMLMarqueeElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLMarqueeElement: {
-    prototype: HTMLMarqueeElement;
-    new(): HTMLMarqueeElement;
-};
-
-interface HTMLMediaElementEventMap extends HTMLElementEventMap {
-    "encrypted": MediaEncryptedEvent;
-    "msneedkey": Event;
-}
-
-interface HTMLMediaElement extends HTMLElement {
-    /**
-     * Returns an AudioTrackList object with the audio tracks for a given video element.
-     */
-    readonly audioTracks: AudioTrackList;
-    /**
-     * Gets or sets a value that indicates whether to start playing the media automatically.
-     */
-    autoplay: boolean;
-    /**
-     * Gets a collection of buffered time ranges.
-     */
-    readonly buffered: TimeRanges;
-    /**
-     * Gets or sets a flag that indicates whether the client provides a set of controls for the media (in case the developer does not include controls for the player).
-     */
-    controls: boolean;
-    crossOrigin: string | null;
-    /**
-     * Gets the address or URL of the current media resource that is selected by IHTMLMediaElement.
-     */
-    readonly currentSrc: string;
-    /**
-     * Gets or sets the current playback position, in seconds.
-     */
-    currentTime: number;
-    defaultMuted: boolean;
-    /**
-     * Gets or sets the default playback rate when the user is not using fast forward or reverse for a video or audio resource.
-     */
-    defaultPlaybackRate: number;
-    /**
-     * Returns the duration in seconds of the current media resource. A NaN value is returned if duration is not available, or Infinity if the media resource is streaming.
-     */
-    readonly duration: number;
-    /**
-     * Gets information about whether the playback has ended or not.
-     */
-    readonly ended: boolean;
-    /**
-     * Returns an object representing the current error state of the audio or video element.
-     */
-    readonly error: MediaError | null;
-    /**
-     * Gets or sets a flag to specify whether playback should restart after it completes.
-     */
-    loop: boolean;
-    readonly mediaKeys: MediaKeys | null;
-    /**
-     * Specifies the purpose of the audio or video media, such as background audio or alerts.
-     */
-    msAudioCategory: string;
-    /**
-     * Specifies the output device id that the audio will be sent to.
-     */
-    msAudioDeviceType: string;
-    readonly msGraphicsTrustStatus: MSGraphicsTrust;
-    /**
-     * Gets the MSMediaKeys object, which is used for decrypting media data, that is associated with this media element.
-     */
-    /** @deprecated */
-    readonly msKeys: MSMediaKeys;
-    /**
-     * Gets or sets whether the DLNA PlayTo device is available.
-     */
-    msPlayToDisabled: boolean;
-    /**
-     * Gets or sets the path to the preferred media source. This enables the Play To target device to stream the media content, which can be DRM protected, from a different location, such as a cloud media server.
-     */
-    msPlayToPreferredSourceUri: string;
-    /**
-     * Gets or sets the primary DLNA PlayTo device.
-     */
-    msPlayToPrimary: boolean;
-    /**
-     * Gets the source associated with the media element for use by the PlayToManager.
-     */
-    readonly msPlayToSource: any;
-    /**
-     * Specifies whether or not to enable low-latency playback on the media element.
-     */
-    msRealTime: boolean;
-    /**
-     * Gets or sets a flag that indicates whether the audio (either audio or the audio track on video media) is muted.
-     */
-    muted: boolean;
-    /**
-     * Gets the current network activity for the element.
-     */
-    readonly networkState: number;
-    onencrypted: ((this: HTMLMediaElement, ev: MediaEncryptedEvent) => any) | null;
-    /** @deprecated */
-    onmsneedkey: ((this: HTMLMediaElement, ev: Event) => any) | null;
-    /**
-     * Gets a flag that specifies whether playback is paused.
-     */
-    readonly paused: boolean;
-    /**
-     * Gets or sets the current rate of speed for the media resource to play. This speed is expressed as a multiple of the normal speed of the media resource.
-     */
-    playbackRate: number;
-    /**
-     * Gets TimeRanges for the current media resource that has been played.
-     */
-    readonly played: TimeRanges;
-    /**
-     * Gets or sets the current playback position, in seconds.
-     */
-    preload: string;
-    readonly readyState: number;
-    /**
-     * Returns a TimeRanges object that represents the ranges of the current media resource that can be seeked.
-     */
-    readonly seekable: TimeRanges;
-    /**
-     * Gets a flag that indicates whether the the client is currently moving to a new playback position in the media resource.
-     */
-    readonly seeking: boolean;
-    /**
-     * The address or URL of the a media resource that is to be considered.
-     */
-    src: string;
-    srcObject: MediaStream | MediaSource | Blob | null;
-    readonly textTracks: TextTrackList;
-    readonly videoTracks: VideoTrackList;
-    /**
-     * Gets or sets the volume level for audio portions of the media element.
-     */
-    volume: number;
-    addTextTrack(kind: TextTrackKind, label?: string, language?: string): TextTrack;
-    /**
-     * Returns a string that specifies whether the client can play a given media resource type.
-     */
-    canPlayType(type: string): CanPlayTypeResult;
-    /**
-     * Resets the audio or video object and loads a new media resource.
-     */
-    load(): void;
-    /**
-     * Clears all effects from the media pipeline.
-     */
-    msClearEffects(): void;
-    msGetAsCastingSource(): any;
-    /**
-     * Inserts the specified audio effect into media pipeline.
-     */
-    msInsertAudioEffect(activatableClassId: string, effectRequired: boolean, config?: any): void;
-    /** @deprecated */
-    msSetMediaKeys(mediaKeys: MSMediaKeys): void;
-    /**
-     * Specifies the media protection manager for a given media pipeline.
-     */
-    msSetMediaProtectionManager(mediaProtectionManager?: any): void;
-    /**
-     * Pauses the current playback and sets paused to TRUE. This can be used to test whether the media is playing or paused. You can also use the pause or play events to tell whether the media is playing or not.
-     */
-    pause(): void;
-    /**
-     * Loads and starts playback of a media resource.
-     */
-    play(): Promise<void>;
-    setMediaKeys(mediaKeys: MediaKeys | null): Promise<void>;
-    readonly HAVE_CURRENT_DATA: number;
-    readonly HAVE_ENOUGH_DATA: number;
-    readonly HAVE_FUTURE_DATA: number;
-    readonly HAVE_METADATA: number;
-    readonly HAVE_NOTHING: number;
-    readonly NETWORK_EMPTY: number;
-    readonly NETWORK_IDLE: number;
-    readonly NETWORK_LOADING: number;
-    readonly NETWORK_NO_SOURCE: number;
-    addEventListener<K extends keyof HTMLMediaElementEventMap>(type: K, listener: (this: HTMLMediaElement, ev: HTMLMediaElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLMediaElementEventMap>(type: K, listener: (this: HTMLMediaElement, ev: HTMLMediaElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLMediaElement: {
-    prototype: HTMLMediaElement;
-    new(): HTMLMediaElement;
-    readonly HAVE_CURRENT_DATA: number;
-    readonly HAVE_ENOUGH_DATA: number;
-    readonly HAVE_FUTURE_DATA: number;
-    readonly HAVE_METADATA: number;
-    readonly HAVE_NOTHING: number;
-    readonly NETWORK_EMPTY: number;
-    readonly NETWORK_IDLE: number;
-    readonly NETWORK_LOADING: number;
-    readonly NETWORK_NO_SOURCE: number;
-};
-
-interface HTMLMenuElement extends HTMLElement {
-    /** @deprecated */
-    compact: boolean;
-    type: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMenuElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMenuElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLMenuElement: {
-    prototype: HTMLMenuElement;
-    new(): HTMLMenuElement;
-};
-
-interface HTMLMetaElement extends HTMLElement {
-    /**
-     * Sets or retrieves the character set used to encode the object.
-     */
-    /** @deprecated */
-    charset: string;
-    /**
-     * Gets or sets meta-information to associate with httpEquiv or name.
-     */
-    content: string;
-    /**
-     * Gets or sets information used to bind the value of a content attribute of a meta element to an HTTP response header.
-     */
-    httpEquiv: string;
-    /**
-     * Sets or retrieves the value specified in the content attribute of the meta object.
-     */
-    name: string;
-    /**
-     * Sets or retrieves a scheme to be used in interpreting the value of a property specified for the object.
-     */
-    /** @deprecated */
-    scheme: string;
-    /**
-     * Sets or retrieves the URL property that will be loaded after the specified time has elapsed.
-     */
-    /** @deprecated */
-    url: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMetaElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMetaElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLMetaElement: {
-    prototype: HTMLMetaElement;
-    new(): HTMLMetaElement;
-};
-
-interface HTMLMeterElement extends HTMLElement {
-    high: number;
-    low: number;
-    max: number;
-    min: number;
-    optimum: number;
-    value: number;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMeterElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLMeterElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLMeterElement: {
-    prototype: HTMLMeterElement;
-    new(): HTMLMeterElement;
-};
-
-interface HTMLModElement extends HTMLElement {
-    /**
-     * Sets or retrieves reference information about the object.
-     */
-    cite: string;
-    /**
-     * Sets or retrieves the date and time of a modification to the object.
-     */
-    dateTime: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLModElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLModElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLModElement: {
-    prototype: HTMLModElement;
-    new(): HTMLModElement;
-};
-
-interface HTMLOListElement extends HTMLElement {
-    /** @deprecated */
-    compact: boolean;
-    /**
-     * The starting number.
-     */
-    start: number;
-    type: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLOListElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLOListElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLOListElement: {
-    prototype: HTMLOListElement;
-    new(): HTMLOListElement;
-};
-
-interface HTMLObjectElement extends HTMLElement, GetSVGDocument {
-    /**
-     * Retrieves a string of the URL where the object tag can be found. This is often the href of the document that the object is in, or the value set by a base element.
-     */
-    readonly BaseHref: string;
-    /** @deprecated */
-    align: string;
-    /**
-     * Sets or retrieves a character string that can be used to implement your own archive functionality for the object.
-     */
-    /** @deprecated */
-    archive: string;
-    /** @deprecated */
-    border: string;
-    /**
-     * Sets or retrieves the URL of the file containing the compiled Java class.
-     */
-    /** @deprecated */
-    code: string;
-    /**
-     * Sets or retrieves the URL of the component.
-     */
-    /** @deprecated */
-    codeBase: string;
-    /**
-     * Sets or retrieves the Internet media type for the code associated with the object.
-     */
-    /** @deprecated */
-    codeType: string;
-    /**
-     * Retrieves the document object of the page or frame.
-     */
-    readonly contentDocument: Document | null;
-    /**
-     * Sets or retrieves the URL that references the data of the object.
-     */
-    data: string;
-    /** @deprecated */
-    declare: boolean;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Sets or retrieves the height of the object.
-     */
-    height: string;
-    /** @deprecated */
-    hspace: number;
-    /**
-     * Gets or sets whether the DLNA PlayTo device is available.
-     */
-    msPlayToDisabled: boolean;
-    /**
-     * Gets or sets the path to the preferred media source. This enables the Play To target device to stream the media content, which can be DRM protected, from a different location, such as a cloud media server.
-     */
-    msPlayToPreferredSourceUri: string;
-    /**
-     * Gets or sets the primary DLNA PlayTo device.
-     */
-    msPlayToPrimary: boolean;
-    /**
-     * Gets the source associated with the media element for use by the PlayToManager.
-     */
-    readonly msPlayToSource: any;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    name: string;
-    readonly readyState: number;
-    /**
-     * Sets or retrieves a message to be displayed while an object is loading.
-     */
-    /** @deprecated */
-    standby: string;
-    /**
-     * Sets or retrieves the MIME type of the object.
-     */
-    type: string;
-    typemustmatch: boolean;
-    /**
-     * Sets or retrieves the URL, often with a bookmark extension (#name), to use as a client-side image map.
-     */
-    useMap: string;
-    /**
-     * Returns the error message that would be displayed if the user submits the form, or an empty string if no error message. It also triggers the standard error message, such as "this is a required field". The result is that the user sees validation messages without actually submitting.
-     */
-    readonly validationMessage: string;
-    /**
-     * Returns a  ValidityState object that represents the validity states of an element.
-     */
-    readonly validity: ValidityState;
-    /** @deprecated */
-    vspace: number;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    width: string;
-    /**
-     * Returns whether an element will successfully validate based on forms validation rules and constraints.
-     */
-    readonly willValidate: boolean;
-    /**
-     * Returns whether a form will validate when it is submitted, without having to submit it.
-     */
-    checkValidity(): boolean;
-    /**
-     * Sets a custom error message that is displayed when a form is submitted.
-     * @param error Sets a custom error message that is displayed when a form is submitted.
-     */
-    setCustomValidity(error: string): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLObjectElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLObjectElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLObjectElement: {
-    prototype: HTMLObjectElement;
-    new(): HTMLObjectElement;
-};
-
-interface HTMLOptGroupElement extends HTMLElement {
-    disabled: boolean;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Sets or retrieves a value that you can use to implement your own label functionality for the object.
-     */
-    label: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLOptGroupElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLOptGroupElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLOptGroupElement: {
-    prototype: HTMLOptGroupElement;
-    new(): HTMLOptGroupElement;
-};
-
-interface HTMLOptionElement extends HTMLElement {
-    /**
-     * Sets or retrieves the status of an option.
-     */
-    defaultSelected: boolean;
-    disabled: boolean;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Sets or retrieves the ordinal position of an option in a list box.
-     */
-    readonly index: number;
-    /**
-     * Sets or retrieves a value that you can use to implement your own label functionality for the object.
-     */
-    label: string;
-    /**
-     * Sets or retrieves whether the option in the list box is the default item.
-     */
-    selected: boolean;
-    /**
-     * Sets or retrieves the text string specified by the option tag.
-     */
-    text: string;
-    /**
-     * Sets or retrieves the value which is returned to the server when the form control is submitted.
-     */
-    value: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLOptionElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLOptionElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLOptionElement: {
-    prototype: HTMLOptionElement;
-    new(): HTMLOptionElement;
-};
-
-interface HTMLOptionsCollection extends HTMLCollectionOf<HTMLOptionElement> {
-    length: number;
-    selectedIndex: number;
-    add(element: HTMLOptionElement | HTMLOptGroupElement, before?: HTMLElement | number | null): void;
-    remove(index: number): void;
-}
-
-declare var HTMLOptionsCollection: {
-    prototype: HTMLOptionsCollection;
-    new(): HTMLOptionsCollection;
-};
-
-interface HTMLOutputElement extends HTMLElement {
-    defaultValue: string;
-    readonly form: HTMLFormElement | null;
-    readonly htmlFor: DOMTokenList;
-    name: string;
-    readonly type: string;
-    readonly validationMessage: string;
-    readonly validity: ValidityState;
-    value: string;
-    readonly willValidate: boolean;
-    checkValidity(): boolean;
-    reportValidity(): boolean;
-    setCustomValidity(error: string): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLOutputElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLOutputElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLOutputElement: {
-    prototype: HTMLOutputElement;
-    new(): HTMLOutputElement;
-};
-
-interface HTMLParagraphElement extends HTMLElement {
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    /** @deprecated */
-    align: string;
-    clear: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLParagraphElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLParagraphElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLParagraphElement: {
-    prototype: HTMLParagraphElement;
-    new(): HTMLParagraphElement;
-};
-
-interface HTMLParamElement extends HTMLElement {
-    /**
-     * Sets or retrieves the name of an input parameter for an element.
-     */
-    name: string;
-    /**
-     * Sets or retrieves the content type of the resource designated by the value attribute.
-     */
-    /** @deprecated */
-    type: string;
-    /**
-     * Sets or retrieves the value of an input parameter for an element.
-     */
-    value: string;
-    /**
-     * Sets or retrieves the data type of the value attribute.
-     */
-    /** @deprecated */
-    valueType: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLParamElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLParamElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLParamElement: {
-    prototype: HTMLParamElement;
-    new(): HTMLParamElement;
-};
-
-interface HTMLPictureElement extends HTMLElement {
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLPictureElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLPictureElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLPictureElement: {
-    prototype: HTMLPictureElement;
-    new(): HTMLPictureElement;
-};
-
-interface HTMLPreElement extends HTMLElement {
-    /**
-     * Sets or gets a value that you can use to implement your own width functionality for the object.
-     */
-    /** @deprecated */
-    width: number;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLPreElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLPreElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLPreElement: {
-    prototype: HTMLPreElement;
-    new(): HTMLPreElement;
-};
-
-interface HTMLProgressElement extends HTMLElement {
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Defines the maximum, or "done" value for a progress element.
-     */
-    max: number;
-    /**
-     * Returns the quotient of value/max when the value attribute is set (determinate progress bar), or -1 when the value attribute is missing (indeterminate progress bar).
-     */
-    readonly position: number;
-    /**
-     * Sets or gets the current value of a progress element. The value must be a non-negative number between 0 and the max value.
-     */
-    value: number;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLProgressElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLProgressElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLProgressElement: {
-    prototype: HTMLProgressElement;
-    new(): HTMLProgressElement;
-};
-
-interface HTMLQuoteElement extends HTMLElement {
-    /**
-     * Sets or retrieves reference information about the object.
-     */
-    cite: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLQuoteElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLQuoteElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLQuoteElement: {
-    prototype: HTMLQuoteElement;
-    new(): HTMLQuoteElement;
-};
-
-interface HTMLScriptElement extends HTMLElement {
-    async: boolean;
-    /**
-     * Sets or retrieves the character set used to encode the object.
-     */
-    charset: string;
-    crossOrigin: string | null;
-    /**
-     * Sets or retrieves the status of the script.
-     */
-    defer: boolean;
-    /**
-     * Sets or retrieves the event for which the script is written.
-     */
-    /** @deprecated */
-    event: string;
-    /**
-     * Sets or retrieves the object that is bound to the event script.
-     */
-    /** @deprecated */
-    htmlFor: string;
-    integrity: string;
-    noModule: boolean;
-    /**
-     * Retrieves the URL to an external file that contains the source code or data.
-     */
-    src: string;
-    /**
-     * Retrieves or sets the text of the object as a string.
-     */
-    text: string;
-    /**
-     * Sets or retrieves the MIME type for the associated scripting engine.
-     */
-    type: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLScriptElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLScriptElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLScriptElement: {
-    prototype: HTMLScriptElement;
-    new(): HTMLScriptElement;
-};
-
-interface HTMLSelectElement extends HTMLElement {
-    /**
-     * Provides a way to direct a user to a specific field when a document loads. This can provide both direction and convenience for a user, reducing the need to click or tab to a field when a page opens. This attribute is true when present on an element, and false when missing.
-     */
-    autofocus: boolean;
-    disabled: boolean;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Sets or retrieves the number of objects in a collection.
-     */
-    length: number;
-    /**
-     * Sets or retrieves the Boolean value indicating whether multiple items can be selected from a list.
-     */
-    multiple: boolean;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    name: string;
-    readonly options: HTMLOptionsCollection;
-    /**
-     * When present, marks an element that can't be submitted without a value.
-     */
-    required: boolean;
-    /**
-     * Sets or retrieves the index of the selected option in a select object.
-     */
-    selectedIndex: number;
-    readonly selectedOptions: HTMLCollectionOf<HTMLOptionElement>;
-    /**
-     * Sets or retrieves the number of rows in the list box.
-     */
-    size: number;
-    /**
-     * Retrieves the type of select control based on the value of the MULTIPLE attribute.
-     */
-    readonly type: string;
-    /**
-     * Returns the error message that would be displayed if the user submits the form, or an empty string if no error message. It also triggers the standard error message, such as "this is a required field". The result is that the user sees validation messages without actually submitting.
-     */
-    readonly validationMessage: string;
-    /**
-     * Returns a  ValidityState object that represents the validity states of an element.
-     */
-    readonly validity: ValidityState;
-    /**
-     * Sets or retrieves the value which is returned to the server when the form control is submitted.
-     */
-    value: string;
-    /**
-     * Returns whether an element will successfully validate based on forms validation rules and constraints.
-     */
-    readonly willValidate: boolean;
-    /**
-     * Adds an element to the areas, controlRange, or options collection.
-     * @param element Variant of type Number that specifies the index position in the collection where the element is placed. If no value is given, the method places the element at the end of the collection.
-     * @param before Variant of type Object that specifies an element to insert before, or null to append the object to the collection.
-     */
-    add(element: HTMLOptionElement | HTMLOptGroupElement, before?: HTMLElement | number | null): void;
-    /**
-     * Returns whether a form will validate when it is submitted, without having to submit it.
-     */
-    checkValidity(): boolean;
-    /**
-     * Retrieves a select object or an object from an options collection.
-     * @param name Variant of type Number or String that specifies the object or collection to retrieve. If this parameter is an integer, it is the zero-based index of the object. If this parameter is a string, all objects with matching name or id properties are retrieved, and a collection is returned if more than one match is made.
-     * @param index Variant of type Number that specifies the zero-based index of the object to retrieve when a collection is returned.
-     */
-    item(name?: any, index?: any): Element | null;
-    /**
-     * Retrieves a select object or an object from an options collection.
-     * @param namedItem A String that specifies the name or id property of the object to retrieve. A collection is returned if more than one match is made.
-     */
-    namedItem(name: string): any;
-    /**
-     * Removes an element from the collection.
-     * @param index Number that specifies the zero-based index of the element to remove from the collection.
-     */
-    remove(index?: number): void;
-    /**
-     * Sets a custom error message that is displayed when a form is submitted.
-     * @param error Sets a custom error message that is displayed when a form is submitted.
-     */
-    setCustomValidity(error: string): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSelectElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSelectElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-    [name: string]: any;
-}
-
-declare var HTMLSelectElement: {
-    prototype: HTMLSelectElement;
-    new(): HTMLSelectElement;
-};
-
-interface HTMLSlotElement extends HTMLElement {
-    name: string;
-    assignedNodes(options?: AssignedNodesOptions): Node[];
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSlotElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSlotElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-interface HTMLSourceElement extends HTMLElement {
-    /**
-     * Gets or sets the intended media type of the media source.
-     */
-    media: string;
-    /** @deprecated */
-    msKeySystem: string;
-    sizes: string;
-    /**
-     * The address or URL of the a media resource that is to be considered.
-     */
-    src: string;
-    srcset: string;
-    /**
-     * Gets or sets the MIME type of a media resource.
-     */
-    type: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSourceElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSourceElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLSourceElement: {
-    prototype: HTMLSourceElement;
-    new(): HTMLSourceElement;
-};
-
-interface HTMLSpanElement extends HTMLElement {
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSpanElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSpanElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLSpanElement: {
-    prototype: HTMLSpanElement;
-    new(): HTMLSpanElement;
-};
-
-interface HTMLStyleElement extends HTMLElement, LinkStyle {
-    /** @deprecated */
-    disabled: boolean;
-    /**
-     * Sets or retrieves the media type.
-     */
-    media: string;
-    /**
-     * Retrieves the CSS language in which the style sheet is written.
-     */
-    type: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLStyleElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLStyleElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLStyleElement: {
-    prototype: HTMLStyleElement;
-    new(): HTMLStyleElement;
-};
-
-interface HTMLSummaryElement extends HTMLElement {
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSummaryElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLSummaryElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLSummaryElement: {
-    prototype: HTMLSummaryElement;
-    new(): HTMLSummaryElement;
-};
-
-interface HTMLTableCaptionElement extends HTMLElement {
-    /**
-     * Sets or retrieves the alignment of the caption or legend.
-     */
-    /** @deprecated */
-    align: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableCaptionElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableCaptionElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTableCaptionElement: {
-    prototype: HTMLTableCaptionElement;
-    new(): HTMLTableCaptionElement;
-};
-
-interface HTMLTableCellElement extends HTMLElement {
-    /**
-     * Sets or retrieves abbreviated text for the object.
-     */
-    abbr: string;
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    /** @deprecated */
-    align: string;
-    /**
-     * Sets or retrieves a comma-delimited list of conceptual categories associated with the object.
-     */
-    /** @deprecated */
-    axis: string;
-    /** @deprecated */
-    bgColor: string;
-    /**
-     * Retrieves the position of the object in the cells collection of a row.
-     */
-    readonly cellIndex: number;
-    /** @deprecated */
-    ch: string;
-    /** @deprecated */
-    chOff: string;
-    /**
-     * Sets or retrieves the number columns in the table that the object should span.
-     */
-    colSpan: number;
-    /**
-     * Sets or retrieves a list of header cells that provide information for the object.
-     */
-    headers: string;
-    /**
-     * Sets or retrieves the height of the object.
-     */
-    /** @deprecated */
-    height: string;
-    /**
-     * Sets or retrieves whether the browser automatically performs wordwrap.
-     */
-    /** @deprecated */
-    noWrap: boolean;
-    /**
-     * Sets or retrieves how many rows in a table the cell should span.
-     */
-    rowSpan: number;
-    /**
-     * Sets or retrieves the group of cells in a table to which the object's information applies.
-     */
-    scope: string;
-    /** @deprecated */
-    vAlign: string;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    /** @deprecated */
-    width: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableCellElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableCellElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTableCellElement: {
-    prototype: HTMLTableCellElement;
-    new(): HTMLTableCellElement;
-};
-
-interface HTMLTableColElement extends HTMLElement {
-    /**
-     * Sets or retrieves the alignment of the object relative to the display or table.
-     */
-    /** @deprecated */
-    align: string;
-    /** @deprecated */
-    ch: string;
-    /** @deprecated */
-    chOff: string;
-    /**
-     * Sets or retrieves the number of columns in the group.
-     */
-    span: number;
-    /** @deprecated */
-    vAlign: string;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    /** @deprecated */
-    width: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableColElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableColElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTableColElement: {
-    prototype: HTMLTableColElement;
-    new(): HTMLTableColElement;
-};
-
-interface HTMLTableDataCellElement extends HTMLTableCellElement {
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableDataCellElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableDataCellElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTableDataCellElement: {
-    prototype: HTMLTableDataCellElement;
-    new(): HTMLTableDataCellElement;
-};
-
-interface HTMLTableElement extends HTMLElement {
-    /**
-     * Sets or retrieves a value that indicates the table alignment.
-     */
-    /** @deprecated */
-    align: string;
-    /** @deprecated */
-    bgColor: string;
-    /**
-     * Sets or retrieves the width of the border to draw around the object.
-     */
-    /** @deprecated */
-    border: string;
-    /**
-     * Retrieves the caption object of a table.
-     */
-    caption: HTMLTableCaptionElement | null;
-    /**
-     * Sets or retrieves the amount of space between the border of the cell and the content of the cell.
-     */
-    /** @deprecated */
-    cellPadding: string;
-    /**
-     * Sets or retrieves the amount of space between cells in a table.
-     */
-    /** @deprecated */
-    cellSpacing: string;
-    /**
-     * Sets or retrieves the way the border frame around the table is displayed.
-     */
-    /** @deprecated */
-    frame: string;
-    /**
-     * Sets or retrieves the number of horizontal rows contained in the object.
-     */
-    readonly rows: HTMLCollectionOf<HTMLTableRowElement>;
-    /**
-     * Sets or retrieves which dividing lines (inner borders) are displayed.
-     */
-    /** @deprecated */
-    rules: string;
-    /**
-     * Sets or retrieves a description and/or structure of the object.
-     */
-    /** @deprecated */
-    summary: string;
-    /**
-     * Retrieves a collection of all tBody objects in the table. Objects in this collection are in source order.
-     */
-    readonly tBodies: HTMLCollectionOf<HTMLTableSectionElement>;
-    /**
-     * Retrieves the tFoot object of the table.
-     */
-    tFoot: HTMLTableSectionElement | null;
-    /**
-     * Retrieves the tHead object of the table.
-     */
-    tHead: HTMLTableSectionElement | null;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    /** @deprecated */
-    width: string;
-    /**
-     * Creates an empty caption element in the table.
-     */
-    createCaption(): HTMLTableCaptionElement;
-    /**
-     * Creates an empty tBody element in the table.
-     */
-    createTBody(): HTMLTableSectionElement;
-    /**
-     * Creates an empty tFoot element in the table.
-     */
-    createTFoot(): HTMLTableSectionElement;
-    /**
-     * Returns the tHead element object if successful, or null otherwise.
-     */
-    createTHead(): HTMLTableSectionElement;
-    /**
-     * Deletes the caption element and its contents from the table.
-     */
-    deleteCaption(): void;
-    /**
-     * Removes the specified row (tr) from the element and from the rows collection.
-     * @param index Number that specifies the zero-based position in the rows collection of the row to remove.
-     */
-    deleteRow(index?: number): void;
-    /**
-     * Deletes the tFoot element and its contents from the table.
-     */
-    deleteTFoot(): void;
-    /**
-     * Deletes the tHead element and its contents from the table.
-     */
-    deleteTHead(): void;
-    /**
-     * Creates a new row (tr) in the table, and adds the row to the rows collection.
-     * @param index Number that specifies where to insert the row in the rows collection. The default value is -1, which appends the new row to the end of the rows collection.
-     */
-    insertRow(index?: number): HTMLTableRowElement;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTableElement: {
-    prototype: HTMLTableElement;
-    new(): HTMLTableElement;
-};
-
-interface HTMLTableHeaderCellElement extends HTMLTableCellElement {
-    scope: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableHeaderCellElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableHeaderCellElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTableHeaderCellElement: {
-    prototype: HTMLTableHeaderCellElement;
-    new(): HTMLTableHeaderCellElement;
-};
-
-interface HTMLTableRowElement extends HTMLElement {
-    /**
-     * Sets or retrieves how the object is aligned with adjacent text.
-     */
-    /** @deprecated */
-    align: string;
-    /** @deprecated */
-    bgColor: string;
-    /**
-     * Retrieves a collection of all cells in the table row.
-     */
-    readonly cells: HTMLCollectionOf<HTMLTableDataCellElement | HTMLTableHeaderCellElement>;
-    /** @deprecated */
-    ch: string;
-    /** @deprecated */
-    chOff: string;
-    /**
-     * Retrieves the position of the object in the rows collection for the table.
-     */
-    readonly rowIndex: number;
-    /**
-     * Retrieves the position of the object in the collection.
-     */
-    readonly sectionRowIndex: number;
-    /** @deprecated */
-    vAlign: string;
-    /**
-     * Removes the specified cell from the table row, as well as from the cells collection.
-     * @param index Number that specifies the zero-based position of the cell to remove from the table row. If no value is provided, the last cell in the cells collection is deleted.
-     */
-    deleteCell(index?: number): void;
-    /**
-     * Creates a new cell in the table row, and adds the cell to the cells collection.
-     * @param index Number that specifies where to insert the cell in the tr. The default value is -1, which appends the new cell to the end of the cells collection.
-     */
-    insertCell(index?: number): HTMLTableDataCellElement;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableRowElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableRowElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTableRowElement: {
-    prototype: HTMLTableRowElement;
-    new(): HTMLTableRowElement;
-};
-
-interface HTMLTableSectionElement extends HTMLElement {
-    /**
-     * Sets or retrieves a value that indicates the table alignment.
-     */
-    /** @deprecated */
-    align: string;
-    /** @deprecated */
-    ch: string;
-    /** @deprecated */
-    chOff: string;
-    /**
-     * Sets or retrieves the number of horizontal rows contained in the object.
-     */
-    readonly rows: HTMLCollectionOf<HTMLTableRowElement>;
-    /** @deprecated */
-    vAlign: string;
-    /**
-     * Removes the specified row (tr) from the element and from the rows collection.
-     * @param index Number that specifies the zero-based position in the rows collection of the row to remove.
-     */
-    deleteRow(index?: number): void;
-    /**
-     * Creates a new row (tr) in the table, and adds the row to the rows collection.
-     * @param index Number that specifies where to insert the row in the rows collection. The default value is -1, which appends the new row to the end of the rows collection.
-     */
-    insertRow(index?: number): HTMLTableRowElement;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableSectionElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTableSectionElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTableSectionElement: {
-    prototype: HTMLTableSectionElement;
-    new(): HTMLTableSectionElement;
-};
-
-interface HTMLTemplateElement extends HTMLElement {
-    readonly content: DocumentFragment;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTemplateElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTemplateElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTemplateElement: {
-    prototype: HTMLTemplateElement;
-    new(): HTMLTemplateElement;
-};
-
-interface HTMLTextAreaElement extends HTMLElement {
-    /**
-     * Provides a way to direct a user to a specific field when a document loads. This can provide both direction and convenience for a user, reducing the need to click or tab to a field when a page opens. This attribute is true when present on an element, and false when missing.
-     */
-    autofocus: boolean;
-    /**
-     * Sets or retrieves the width of the object.
-     */
-    cols: number;
-    /**
-     * Sets or retrieves the initial contents of the object.
-     */
-    defaultValue: string;
-    disabled: boolean;
-    /**
-     * Retrieves a reference to the form that the object is embedded in.
-     */
-    readonly form: HTMLFormElement | null;
-    /**
-     * Sets or retrieves the maximum number of characters that the user can enter in a text control.
-     */
-    maxLength: number;
-    minLength: number;
-    /**
-     * Sets or retrieves the name of the object.
-     */
-    name: string;
-    /**
-     * Gets or sets a text string that is displayed in an input field as a hint or prompt to users as the format or type of information they need to enter.The text appears in an input field until the user puts focus on the field.
-     */
-    placeholder: string;
-    /**
-     * Sets or retrieves the value indicated whether the content of the object is read-only.
-     */
-    readOnly: boolean;
-    /**
-     * When present, marks an element that can't be submitted without a value.
-     */
-    required: boolean;
-    /**
-     * Sets or retrieves the number of horizontal rows contained in the object.
-     */
-    rows: number;
-    /**
-     * Gets or sets the end position or offset of a text selection.
-     */
-    selectionEnd: number;
-    /**
-     * Gets or sets the starting position or offset of a text selection.
-     */
-    selectionStart: number;
-    /**
-     * Retrieves the type of control.
-     */
-    readonly type: string;
-    /**
-     * Returns the error message that would be displayed if the user submits the form, or an empty string if no error message. It also triggers the standard error message, such as "this is a required field". The result is that the user sees validation messages without actually submitting.
-     */
-    readonly validationMessage: string;
-    /**
-     * Returns a  ValidityState object that represents the validity states of an element.
-     */
-    readonly validity: ValidityState;
-    /**
-     * Retrieves or sets the text in the entry field of the textArea element.
-     */
-    value: string;
-    /**
-     * Returns whether an element will successfully validate based on forms validation rules and constraints.
-     */
-    readonly willValidate: boolean;
-    /**
-     * Sets or retrieves how to handle wordwrapping in the object.
-     */
-    wrap: string;
-    /**
-     * Returns whether a form will validate when it is submitted, without having to submit it.
-     */
-    checkValidity(): boolean;
-    /**
-     * Highlights the input area of a form element.
-     */
-    select(): void;
-    /**
-     * Sets a custom error message that is displayed when a form is submitted.
-     * @param error Sets a custom error message that is displayed when a form is submitted.
-     */
-    setCustomValidity(error: string): void;
-    /**
-     * Sets the start and end positions of a selection in a text field.
-     * @param start The offset into the text field for the start of the selection.
-     * @param end The offset into the text field for the end of the selection.
-     * @param direction The direction in which the selection is performed.
-     */
-    setSelectionRange(start: number, end: number, direction?: "forward" | "backward" | "none"): void;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTextAreaElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTextAreaElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTextAreaElement: {
-    prototype: HTMLTextAreaElement;
-    new(): HTMLTextAreaElement;
-};
-
-interface HTMLTimeElement extends HTMLElement {
-    dateTime: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTimeElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTimeElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTimeElement: {
-    prototype: HTMLTimeElement;
-    new(): HTMLTimeElement;
-};
-
-interface HTMLTitleElement extends HTMLElement {
-    /**
-     * Retrieves or sets the text of the object as a string.
-     */
-    text: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTitleElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTitleElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTitleElement: {
-    prototype: HTMLTitleElement;
-    new(): HTMLTitleElement;
-};
-
-interface HTMLTrackElement extends HTMLElement {
-    default: boolean;
-    kind: string;
-    label: string;
-    readonly readyState: number;
-    src: string;
-    srclang: string;
-    readonly track: TextTrack;
-    readonly ERROR: number;
-    readonly LOADED: number;
-    readonly LOADING: number;
-    readonly NONE: number;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTrackElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLTrackElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLTrackElement: {
-    prototype: HTMLTrackElement;
-    new(): HTMLTrackElement;
-    readonly ERROR: number;
-    readonly LOADED: number;
-    readonly LOADING: number;
-    readonly NONE: number;
-};
-
-interface HTMLUListElement extends HTMLElement {
-    /** @deprecated */
-    compact: boolean;
-    /** @deprecated */
-    type: string;
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLUListElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLUListElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLUListElement: {
-    prototype: HTMLUListElement;
-    new(): HTMLUListElement;
-};
-
-interface HTMLUnknownElement extends HTMLElement {
-    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLUnknownElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLUnknownElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLUnknownElement: {
-    prototype: HTMLUnknownElement;
-    new(): HTMLUnknownElement;
-};
-
-interface HTMLVideoElementEventMap extends HTMLMediaElementEventMap {
-    "MSVideoFormatChanged": Event;
-    "MSVideoFrameStepCompleted": Event;
-    "MSVideoOptimalLayoutChanged": Event;
-}
-
-interface HTMLVideoElement extends HTMLMediaElement {
-    /**
-     * Gets or sets the height of the video element.
-     */
-    height: number;
-    msHorizontalMirror: boolean;
-    readonly msIsLayoutOptimalForPlayback: boolean;
-    readonly msIsStereo3D: boolean;
-    msStereo3DPackingMode: string;
-    msStereo3DRenderMode: string;
-    msZoom: boolean;
-    onMSVideoFormatChanged: ((this: HTMLVideoElement, ev: Event) => any) | null;
-    onMSVideoFrameStepCompleted: ((this: HTMLVideoElement, ev: Event) => any) | null;
-    onMSVideoOptimalLayoutChanged: ((this: HTMLVideoElement, ev: Event) => any) | null;
-    /**
-     * Gets or sets a URL of an image to display, for example, like a movie poster. This can be a still frame from the video, or another image if no video data is available.
-     */
-    poster: string;
-    /**
-     * Gets the intrinsic height of a video in CSS pixels, or zero if the dimensions are not known.
-     */
-    readonly videoHeight: number;
-    /**
-     * Gets the intrinsic width of a video in CSS pixels, or zero if the dimensions are not known.
-     */
-    readonly videoWidth: number;
-    readonly webkitDisplayingFullscreen: boolean;
-    readonly webkitSupportsFullscreen: boolean;
-    /**
-     * Gets or sets the width of the video element.
-     */
-    width: number;
-    getVideoPlaybackQuality(): VideoPlaybackQuality;
-    msFrameStep(forward: boolean): void;
-    msInsertVideoEffect(activatableClassId: string, effectRequired: boolean, config?: any): void;
-    msSetVideoRectangle(left: number, top: number, right: number, bottom: number): void;
-    webkitEnterFullScreen(): void;
-    webkitEnterFullscreen(): void;
-    webkitExitFullScreen(): void;
-    webkitExitFullscreen(): void;
-    addEventListener<K extends keyof HTMLVideoElementEventMap>(type: K, listener: (this: HTMLVideoElement, ev: HTMLVideoElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof HTMLVideoElementEventMap>(type: K, listener: (this: HTMLVideoElement, ev: HTMLVideoElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var HTMLVideoElement: {
-    prototype: HTMLVideoElement;
-    new(): HTMLVideoElement;
-};
-
-interface HTMLegendElement {
-    readonly form: HTMLFormElement | null;
-}
-
-declare var HTMLegendElement: {
-    prototype: HTMLegendElement;
-    new(): HTMLegendElement;
-};
-
-interface HashChangeEvent extends Event {
-    readonly newURL: string;
-    readonly oldURL: string;
-}
-
-declare var HashChangeEvent: {
-    prototype: HashChangeEvent;
-    new(type: string, eventInitDict?: HashChangeEventInit): HashChangeEvent;
-};
-
-interface Headers {
-    append(name: string, value: string): void;
-    delete(name: string): void;
-    forEach(callback: Function, thisArg?: any): void;
-    get(name: string): string | null;
-    has(name: string): boolean;
-    set(name: string, value: string): void;
-}
-
-declare var Headers: {
-    prototype: Headers;
-    new(init?: HeadersInit): Headers;
-};
-
-interface History {
-    readonly length: number;
-    scrollRestoration: ScrollRestoration;
-    readonly state: any;
-    back(distance?: any): void;
-    forward(distance?: any): void;
-    go(delta?: any): void;
-    pushState(data: any, title?: string, url?: string | null): void;
-    replaceState(data: any, title?: string, url?: string | null): void;
-}
-
-declare var History: {
-    prototype: History;
-    new(): History;
-};
-
-interface HkdfCtrParams extends Algorithm {
-    context: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer;
-    hash: string | Algorithm;
-    label: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer;
-}
-
-interface IDBArrayKey extends Array<number | string | Date | IDBArrayKey> {
-}
-
-interface IDBCursor {
-    readonly direction: IDBCursorDirection;
-    readonly key: IDBKeyRange | number | string | Date | IDBArrayKey;
-    readonly primaryKey: any;
-    readonly source: IDBObjectStore | IDBIndex;
-    advance(count: number): void;
-    continue(key?: IDBKeyRange | number | string | Date | IDBArrayKey): void;
-    delete(): IDBRequest;
-    update(value: any): IDBRequest;
-    readonly NEXT: string;
-    readonly NEXT_NO_DUPLICATE: string;
-    readonly PREV: string;
-    readonly PREV_NO_DUPLICATE: string;
-}
-
-declare var IDBCursor: {
-    prototype: IDBCursor;
-    new(): IDBCursor;
-    readonly NEXT: string;
-    readonly NEXT_NO_DUPLICATE: string;
-    readonly PREV: string;
-    readonly PREV_NO_DUPLICATE: string;
-};
-
-interface IDBCursorWithValue extends IDBCursor {
-    readonly value: any;
-}
-
-declare var IDBCursorWithValue: {
-    prototype: IDBCursorWithValue;
-    new(): IDBCursorWithValue;
-};
-
-interface IDBDatabaseEventMap {
-    "abort": Event;
-    "error": Event;
-}
-
-interface IDBDatabase extends EventTarget {
-    readonly name: string;
-    readonly objectStoreNames: DOMStringList;
-    onabort: ((this: IDBDatabase, ev: Event) => any) | null;
-    onerror: ((this: IDBDatabase, ev: Event) => any) | null;
-    onversionchange: ((this: IDBDatabase, ev: Event) => any) | null;
-    readonly version: number;
-    close(): void;
-    createObjectStore(name: string, optionalParameters?: IDBObjectStoreParameters): IDBObjectStore;
-    deleteObjectStore(name: string): void;
-    transaction(storeNames: string | string[], mode?: IDBTransactionMode): IDBTransaction;
-    addEventListener<K extends keyof IDBDatabaseEventMap>(type: K, listener: (this: IDBDatabase, ev: IDBDatabaseEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof IDBDatabaseEventMap>(type: K, listener: (this: IDBDatabase, ev: IDBDatabaseEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var IDBDatabase: {
-    prototype: IDBDatabase;
-    new(): IDBDatabase;
-};
-
-interface IDBEnvironment {
-    readonly indexedDB: IDBFactory;
-}
-
-interface IDBFactory {
-    cmp(first: any, second: any): number;
-    deleteDatabase(name: string): IDBOpenDBRequest;
-    open(name: string, version?: number): IDBOpenDBRequest;
-}
-
-declare var IDBFactory: {
-    prototype: IDBFactory;
-    new(): IDBFactory;
-};
-
-interface IDBIndex {
-    readonly keyPath: string | string[];
-    multiEntry: boolean;
-    readonly name: string;
-    readonly objectStore: IDBObjectStore;
-    readonly unique: boolean;
-    count(key?: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-    get(key: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-    getKey(key: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-    openCursor(range?: IDBKeyRange | number | string | Date | IDBArrayKey, direction?: IDBCursorDirection): IDBRequest;
-    openKeyCursor(range?: IDBKeyRange | number | string | Date | IDBArrayKey, direction?: IDBCursorDirection): IDBRequest;
-}
-
-declare var IDBIndex: {
-    prototype: IDBIndex;
-    new(): IDBIndex;
-};
-
-interface IDBKeyRange {
-    readonly lower: any;
-    readonly lowerOpen: boolean;
-    readonly upper: any;
-    readonly upperOpen: boolean;
-}
-
-declare var IDBKeyRange: {
-    prototype: IDBKeyRange;
-    new(): IDBKeyRange;
-    bound(lower: any, upper: any, lowerOpen?: boolean, upperOpen?: boolean): IDBKeyRange;
-    lowerBound(lower: any, open?: boolean): IDBKeyRange;
-    only(value: any): IDBKeyRange;
-    upperBound(upper: any, open?: boolean): IDBKeyRange;
-};
-
-interface IDBObjectStore {
-    autoIncrement: boolean;
-    readonly indexNames: DOMStringList;
-    readonly keyPath: string | string[] | null;
-    readonly name: string;
-    readonly transaction: IDBTransaction;
-    add(value: any, key?: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-    clear(): IDBRequest;
-    count(key?: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-    createIndex(name: string, keyPath: string | string[], optionalParameters?: IDBIndexParameters): IDBIndex;
-    delete(key: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-    deleteIndex(indexName: string): void;
-    get(key: any): IDBRequest;
-    index(name: string): IDBIndex;
-    openCursor(range?: IDBKeyRange | number | string | Date | IDBArrayKey, direction?: IDBCursorDirection): IDBRequest;
-    put(value: any, key?: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-}
-
-declare var IDBObjectStore: {
-    prototype: IDBObjectStore;
-    new(): IDBObjectStore;
-};
-
-interface IDBOpenDBRequestEventMap extends IDBRequestEventMap {
-    "blocked": Event;
-    "upgradeneeded": IDBVersionChangeEvent;
-}
-
-interface IDBOpenDBRequest extends IDBRequest {
-    onblocked: ((this: IDBOpenDBRequest, ev: Event) => any) | null;
-    onupgradeneeded: ((this: IDBOpenDBRequest, ev: IDBVersionChangeEvent) => any) | null;
-    addEventListener<K extends keyof IDBOpenDBRequestEventMap>(type: K, listener: (this: IDBOpenDBRequest, ev: IDBOpenDBRequestEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof IDBOpenDBRequestEventMap>(type: K, listener: (this: IDBOpenDBRequest, ev: IDBOpenDBRequestEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var IDBOpenDBRequest: {
-    prototype: IDBOpenDBRequest;
-    new(): IDBOpenDBRequest;
-};
-
-interface IDBRequestEventMap {
-    "error": Event;
-    "success": Event;
-}
-
-interface IDBRequest extends EventTarget {
-    readonly error: DOMException;
-    onerror: ((this: IDBRequest, ev: Event) => any) | null;
-    onsuccess: ((this: IDBRequest, ev: Event) => any) | null;
-    readonly readyState: IDBRequestReadyState;
-    readonly result: any;
-    readonly source: IDBObjectStore | IDBIndex | IDBCursor;
-    readonly transaction: IDBTransaction;
-    addEventListener<K extends keyof IDBRequestEventMap>(type: K, listener: (this: IDBRequest, ev: IDBRequestEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof IDBRequestEventMap>(type: K, listener: (this: IDBRequest, ev: IDBRequestEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var IDBRequest: {
-    prototype: IDBRequest;
-    new(): IDBRequest;
-};
-
-interface IDBTransactionEventMap {
-    "abort": Event;
-    "complete": Event;
-    "error": Event;
-}
-
-interface IDBTransaction extends EventTarget {
-    readonly db: IDBDatabase;
-    readonly error: DOMException;
-    readonly mode: IDBTransactionMode;
-    onabort: ((this: IDBTransaction, ev: Event) => any) | null;
-    oncomplete: ((this: IDBTransaction, ev: Event) => any) | null;
-    onerror: ((this: IDBTransaction, ev: Event) => any) | null;
-    abort(): void;
-    objectStore(name: string): IDBObjectStore;
-    readonly READ_ONLY: string;
-    readonly READ_WRITE: string;
-    readonly VERSION_CHANGE: string;
-    addEventListener<K extends keyof IDBTransactionEventMap>(type: K, listener: (this: IDBTransaction, ev: IDBTransactionEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof IDBTransactionEventMap>(type: K, listener: (this: IDBTransaction, ev: IDBTransactionEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var IDBTransaction: {
-    prototype: IDBTransaction;
-    new(): IDBTransaction;
-    readonly READ_ONLY: string;
-    readonly READ_WRITE: string;
-    readonly VERSION_CHANGE: string;
-};
-
-interface IDBVersionChangeEvent extends Event {
-    readonly newVersion: number | null;
-    readonly oldVersion: number;
-}
-
-declare var IDBVersionChangeEvent: {
-    prototype: IDBVersionChangeEvent;
-    new(): IDBVersionChangeEvent;
-};
-
-interface IIRFilterNode extends AudioNode {
-    getFrequencyResponse(frequencyHz: Float32Array, magResponse: Float32Array, phaseResponse: Float32Array): void;
-}
-
-declare var IIRFilterNode: {
-    prototype: IIRFilterNode;
-    new(): IIRFilterNode;
-};
-
-interface ImageBitmap {
-    readonly height: number;
-    readonly width: number;
-    close(): void;
-}
-
-interface ImageBitmapOptions {
-    colorSpaceConversion?: "none" | "default";
-    imageOrientation?: "none" | "flipY";
-    premultiplyAlpha?: "none" | "premultiply" | "default";
-    resizeHeight?: number;
-    resizeQuality?: "pixelated" | "low" | "medium" | "high";
-    resizeWidth?: number;
-}
-
-interface ImageData {
-    readonly data: Uint8ClampedArray;
-    readonly height: number;
-    readonly width: number;
-}
-
-declare var ImageData: {
-    prototype: ImageData;
-    new(width: number, height: number): ImageData;
-    new(array: Uint8ClampedArray, width: number, height: number): ImageData;
-};
-
-interface IntersectionObserver {
-    readonly root: Element | null;
-    readonly rootMargin: string;
-    readonly thresholds: number[];
-    disconnect(): void;
-    observe(target: Element): void;
-    takeRecords(): IntersectionObserverEntry[];
-    unobserve(target: Element): void;
-}
-
-declare var IntersectionObserver: {
-    prototype: IntersectionObserver;
-    new(callback: IntersectionObserverCallback, options?: IntersectionObserverInit): IntersectionObserver;
-};
-
-interface IntersectionObserverEntry {
-    readonly boundingClientRect: ClientRect | DOMRect;
-    readonly intersectionRatio: number;
-    readonly intersectionRect: ClientRect | DOMRect;
-    readonly isIntersecting: boolean;
-    readonly rootBounds: ClientRect | DOMRect;
-    readonly target: Element;
-    readonly time: number;
-}
-
-declare var IntersectionObserverEntry: {
-    prototype: IntersectionObserverEntry;
-    new(intersectionObserverEntryInit: IntersectionObserverEntryInit): IntersectionObserverEntry;
-};
-
-interface KeyboardEvent extends UIEvent {
-    readonly altKey: boolean;
-    /** @deprecated */
-    char: string;
-    /** @deprecated */
-    readonly charCode: number;
-    readonly code: string;
-    readonly ctrlKey: boolean;
-    readonly key: string;
-    /** @deprecated */
-    readonly keyCode: number;
-    readonly location: number;
-    readonly metaKey: boolean;
-    readonly repeat: boolean;
-    readonly shiftKey: boolean;
-    /** @deprecated */
-    readonly which: number;
-    getModifierState(keyArg: string): boolean;
-    /** @deprecated */
-    initKeyboardEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, keyArg: string, locationArg: number, modifiersListArg: string, repeat: boolean, locale: string): void;
-    readonly DOM_KEY_LOCATION_JOYSTICK: number;
-    readonly DOM_KEY_LOCATION_LEFT: number;
-    readonly DOM_KEY_LOCATION_MOBILE: number;
-    readonly DOM_KEY_LOCATION_NUMPAD: number;
-    readonly DOM_KEY_LOCATION_RIGHT: number;
-    readonly DOM_KEY_LOCATION_STANDARD: number;
-}
-
-declare var KeyboardEvent: {
-    prototype: KeyboardEvent;
-    new(typeArg: string, eventInitDict?: KeyboardEventInit): KeyboardEvent;
-    readonly DOM_KEY_LOCATION_JOYSTICK: number;
-    readonly DOM_KEY_LOCATION_LEFT: number;
-    readonly DOM_KEY_LOCATION_MOBILE: number;
-    readonly DOM_KEY_LOCATION_NUMPAD: number;
-    readonly DOM_KEY_LOCATION_RIGHT: number;
-    readonly DOM_KEY_LOCATION_STANDARD: number;
-};
-
-interface LinkStyle {
-    readonly sheet: StyleSheet | null;
-}
-
-interface ListeningStateChangedEvent extends Event {
-    readonly label: string;
-    readonly state: ListeningState;
-}
-
-declare var ListeningStateChangedEvent: {
-    prototype: ListeningStateChangedEvent;
-    new(): ListeningStateChangedEvent;
-};
-
-interface Location {
-    hash: string;
-    host: string;
-    hostname: string;
-    href: string;
-    readonly origin: string;
-    pathname: string;
-    port: string;
-    protocol: string;
-    search: string;
-    assign(url: string): void;
-    reload(forcedReload?: boolean): void;
-    replace(url: string): void;
-    toString(): string;
-}
-
-declare var Location: {
-    prototype: Location;
-    new(): Location;
-};
-
-interface MSAssertion {
-    readonly id: string;
-    readonly type: MSCredentialType;
-}
-
-declare var MSAssertion: {
-    prototype: MSAssertion;
-    new(): MSAssertion;
-};
-
-interface MSBlobBuilder {
-    append(data: any, endings?: string): void;
-    getBlob(contentType?: string): Blob;
-}
-
-declare var MSBlobBuilder: {
-    prototype: MSBlobBuilder;
-    new(): MSBlobBuilder;
-};
-
-interface MSCredentials {
-    getAssertion(challenge: string, filter?: MSCredentialFilter, params?: MSSignatureParameters): Promise<MSAssertion>;
-    makeCredential(accountInfo: MSAccountInfo, params: MSCredentialParameters[], challenge?: string): Promise<MSAssertion>;
-}
-
-declare var MSCredentials: {
-    prototype: MSCredentials;
-    new(): MSCredentials;
-};
-
-interface MSDCCEvent extends Event {
-    readonly maxFr: number;
-    readonly maxFs: number;
-}
-
-declare var MSDCCEvent: {
-    prototype: MSDCCEvent;
-    new(type: string, eventInitDict: MSDCCEventInit): MSDCCEvent;
-};
-
-interface MSDSHEvent extends Event {
-    readonly sources: number[];
-    readonly timestamp: number;
-}
-
-declare var MSDSHEvent: {
-    prototype: MSDSHEvent;
-    new(type: string, eventInitDict: MSDSHEventInit): MSDSHEvent;
-};
-
-interface MSFIDOCredentialAssertion extends MSAssertion {
-    readonly algorithm: string | Algorithm;
-    readonly attestation: any;
-    readonly publicKey: string;
-    readonly transportHints: MSTransportType[];
-}
-
-declare var MSFIDOCredentialAssertion: {
-    prototype: MSFIDOCredentialAssertion;
-    new(): MSFIDOCredentialAssertion;
-};
-
-interface MSFIDOSignature {
-    readonly authnrData: string;
-    readonly clientData: string;
-    readonly signature: string;
-}
-
-declare var MSFIDOSignature: {
-    prototype: MSFIDOSignature;
-    new(): MSFIDOSignature;
-};
-
-interface MSFIDOSignatureAssertion extends MSAssertion {
-    readonly signature: MSFIDOSignature;
-}
-
-declare var MSFIDOSignatureAssertion: {
-    prototype: MSFIDOSignatureAssertion;
-    new(): MSFIDOSignatureAssertion;
-};
-
-interface MSFileSaver {
-    msSaveBlob(blob: any, defaultName?: string): boolean;
-    msSaveOrOpenBlob(blob: any, defaultName?: string): boolean;
-}
-
-interface MSGesture {
-    target: Element;
-    addPointer(pointerId: number): void;
-    stop(): void;
-}
-
-declare var MSGesture: {
-    prototype: MSGesture;
-    new(): MSGesture;
-};
-
-interface MSGestureEvent extends UIEvent {
-    readonly clientX: number;
-    readonly clientY: number;
-    readonly expansion: number;
-    readonly gestureObject: any;
-    readonly hwTimestamp: number;
-    readonly offsetX: number;
-    readonly offsetY: number;
-    readonly rotation: number;
-    readonly scale: number;
-    readonly screenX: number;
-    readonly screenY: number;
-    readonly translationX: number;
-    readonly translationY: number;
-    readonly velocityAngular: number;
-    readonly velocityExpansion: number;
-    readonly velocityX: number;
-    readonly velocityY: number;
-    initGestureEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number, screenXArg: number, screenYArg: number, clientXArg: number, clientYArg: number, offsetXArg: number, offsetYArg: number, translationXArg: number, translationYArg: number, scaleArg: number, expansionArg: number, rotationArg: number, velocityXArg: number, velocityYArg: number, velocityExpansionArg: number, velocityAngularArg: number, hwTimestampArg: number): void;
-    readonly MSGESTURE_FLAG_BEGIN: number;
-    readonly MSGESTURE_FLAG_CANCEL: number;
-    readonly MSGESTURE_FLAG_END: number;
-    readonly MSGESTURE_FLAG_INERTIA: number;
-    readonly MSGESTURE_FLAG_NONE: number;
-}
-
-declare var MSGestureEvent: {
-    prototype: MSGestureEvent;
-    new(): MSGestureEvent;
-    readonly MSGESTURE_FLAG_BEGIN: number;
-    readonly MSGESTURE_FLAG_CANCEL: number;
-    readonly MSGESTURE_FLAG_END: number;
-    readonly MSGESTURE_FLAG_INERTIA: number;
-    readonly MSGESTURE_FLAG_NONE: number;
-};
-
-interface MSGraphicsTrust {
-    readonly constrictionActive: boolean;
-    readonly status: string;
-}
-
-declare var MSGraphicsTrust: {
-    prototype: MSGraphicsTrust;
-    new(): MSGraphicsTrust;
-};
-
-interface MSInputMethodContextEventMap {
-    "MSCandidateWindowHide": Event;
-    "MSCandidateWindowShow": Event;
-    "MSCandidateWindowUpdate": Event;
-}
-
-interface MSInputMethodContext extends EventTarget {
-    readonly compositionEndOffset: number;
-    readonly compositionStartOffset: number;
-    oncandidatewindowhide: ((this: MSInputMethodContext, ev: Event) => any) | null;
-    oncandidatewindowshow: ((this: MSInputMethodContext, ev: Event) => any) | null;
-    oncandidatewindowupdate: ((this: MSInputMethodContext, ev: Event) => any) | null;
-    readonly target: HTMLElement;
-    getCandidateWindowClientRect(): ClientRect;
-    getCompositionAlternatives(): string[];
-    hasComposition(): boolean;
-    isCandidateWindowVisible(): boolean;
-    addEventListener<K extends keyof MSInputMethodContextEventMap>(type: K, listener: (this: MSInputMethodContext, ev: MSInputMethodContextEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof MSInputMethodContextEventMap>(type: K, listener: (this: MSInputMethodContext, ev: MSInputMethodContextEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var MSInputMethodContext: {
-    prototype: MSInputMethodContext;
-    new(): MSInputMethodContext;
-};
-
-interface MSMediaKeyError {
-    readonly code: number;
-    readonly systemCode: number;
-    readonly MS_MEDIA_KEYERR_CLIENT: number;
-    readonly MS_MEDIA_KEYERR_DOMAIN: number;
-    readonly MS_MEDIA_KEYERR_HARDWARECHANGE: number;
-    readonly MS_MEDIA_KEYERR_OUTPUT: number;
-    readonly MS_MEDIA_KEYERR_SERVICE: number;
-    readonly MS_MEDIA_KEYERR_UNKNOWN: number;
-}
-
-declare var MSMediaKeyError: {
-    prototype: MSMediaKeyError;
-    new(): MSMediaKeyError;
-    readonly MS_MEDIA_KEYERR_CLIENT: number;
-    readonly MS_MEDIA_KEYERR_DOMAIN: number;
-    readonly MS_MEDIA_KEYERR_HARDWARECHANGE: number;
-    readonly MS_MEDIA_KEYERR_OUTPUT: number;
-    readonly MS_MEDIA_KEYERR_SERVICE: number;
-    readonly MS_MEDIA_KEYERR_UNKNOWN: number;
-};
-
-interface MSMediaKeyMessageEvent extends Event {
-    readonly destinationURL: string | null;
-    readonly message: Uint8Array;
-}
-
-declare var MSMediaKeyMessageEvent: {
-    prototype: MSMediaKeyMessageEvent;
-    new(): MSMediaKeyMessageEvent;
-};
-
-interface MSMediaKeyNeededEvent extends Event {
-    readonly initData: Uint8Array | null;
-}
-
-declare var MSMediaKeyNeededEvent: {
-    prototype: MSMediaKeyNeededEvent;
-    new(): MSMediaKeyNeededEvent;
-};
-
-interface MSMediaKeySession extends EventTarget {
-    readonly error: MSMediaKeyError | null;
-    readonly keySystem: string;
-    readonly sessionId: string;
-    close(): void;
-    update(key: Uint8Array): void;
-}
-
-declare var MSMediaKeySession: {
-    prototype: MSMediaKeySession;
-    new(): MSMediaKeySession;
-};
-
-interface MSMediaKeys {
-    readonly keySystem: string;
-    createSession(type: string, initData: Uint8Array, cdmData?: Uint8Array | null): MSMediaKeySession;
-}
-
-declare var MSMediaKeys: {
-    prototype: MSMediaKeys;
-    new(keySystem: string): MSMediaKeys;
-    isTypeSupported(keySystem: string, type?: string | null): boolean;
-    isTypeSupportedWithFeatures(keySystem: string, type?: string | null): string;
-};
-
-interface MSNavigatorDoNotTrack {
-    confirmSiteSpecificTrackingException(args: ConfirmSiteSpecificExceptionsInformation): boolean;
-    confirmWebWideTrackingException(args: ExceptionInformation): boolean;
-    removeSiteSpecificTrackingException(args: ExceptionInformation): void;
-    removeWebWideTrackingException(args: ExceptionInformation): void;
-    storeSiteSpecificTrackingException(args: StoreSiteSpecificExceptionsInformation): void;
-    storeWebWideTrackingException(args: StoreExceptionsInformation): void;
-}
-
-interface MSPointerEvent extends MouseEvent {
-    readonly currentPoint: any;
-    readonly height: number;
-    readonly hwTimestamp: number;
-    readonly intermediatePoints: any;
-    readonly isPrimary: boolean;
-    readonly pointerId: number;
-    readonly pointerType: any;
-    readonly pressure: number;
-    readonly rotation: number;
-    readonly tiltX: number;
-    readonly tiltY: number;
-    readonly width: number;
-    getCurrentPoint(element: Element): void;
-    getIntermediatePoints(element: Element): void;
-    initPointerEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number, screenXArg: number, screenYArg: number, clientXArg: number, clientYArg: number, ctrlKeyArg: boolean, altKeyArg: boolean, shiftKeyArg: boolean, metaKeyArg: boolean, buttonArg: number, relatedTargetArg: EventTarget, offsetXArg: number, offsetYArg: number, widthArg: number, heightArg: number, pressure: number, rotation: number, tiltX: number, tiltY: number, pointerIdArg: number, pointerType: any, hwTimestampArg: number, isPrimary: boolean): void;
-}
-
-declare var MSPointerEvent: {
-    prototype: MSPointerEvent;
-    new(typeArg: string, eventInitDict?: PointerEventInit): MSPointerEvent;
-};
-
-interface MSStream {
-    readonly type: string;
-    msClose(): void;
-    msDetachStream(): any;
-}
-
-declare var MSStream: {
-    prototype: MSStream;
-    new(): MSStream;
-};
-
-interface MSStreamReaderEventMap {
-    "abort": UIEvent;
-    "error": ErrorEvent;
-    "load": Event;
-    "loadend": ProgressEvent;
-    "loadstart": Event;
-    "progress": ProgressEvent;
-}
-
-interface MSStreamReader extends EventTarget {
-    readonly error: DOMError;
-    onabort: ((this: MSStreamReader, ev: UIEvent) => any) | null;
-    onerror: ((this: MSStreamReader, ev: ErrorEvent) => any) | null;
-    onload: ((this: MSStreamReader, ev: Event) => any) | null;
-    onloadend: ((this: MSStreamReader, ev: ProgressEvent) => any) | null;
-    onloadstart: ((this: MSStreamReader, ev: Event) => any) | null;
-    onprogress: ((this: MSStreamReader, ev: ProgressEvent) => any) | null;
-    readonly readyState: number;
-    readonly result: any;
-    abort(): void;
-    readAsArrayBuffer(stream: MSStream, size?: number): void;
-    readAsBinaryString(stream: MSStream, size?: number): void;
-    readAsBlob(stream: MSStream, size?: number): void;
-    readAsDataURL(stream: MSStream, size?: number): void;
-    readAsText(stream: MSStream, encoding?: string, size?: number): void;
-    readonly DONE: number;
-    readonly EMPTY: number;
-    readonly LOADING: number;
-    addEventListener<K extends keyof MSStreamReaderEventMap>(type: K, listener: (this: MSStreamReader, ev: MSStreamReaderEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof MSStreamReaderEventMap>(type: K, listener: (this: MSStreamReader, ev: MSStreamReaderEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var MSStreamReader: {
-    prototype: MSStreamReader;
-    new(): MSStreamReader;
-    readonly DONE: number;
-    readonly EMPTY: number;
-    readonly LOADING: number;
-};
-
-interface MediaDeviceInfo {
-    readonly deviceId: string;
-    readonly groupId: string;
-    readonly kind: MediaDeviceKind;
-    readonly label: string;
-}
-
-declare var MediaDeviceInfo: {
-    prototype: MediaDeviceInfo;
-    new(): MediaDeviceInfo;
-};
-
-interface MediaDevicesEventMap {
-    "devicechange": Event;
-}
-
-interface MediaDevices extends EventTarget {
-    ondevicechange: ((this: MediaDevices, ev: Event) => any) | null;
-    enumerateDevices(): Promise<MediaDeviceInfo[]>;
-    getSupportedConstraints(): MediaTrackSupportedConstraints;
-    getUserMedia(constraints: MediaStreamConstraints): Promise<MediaStream>;
-    addEventListener<K extends keyof MediaDevicesEventMap>(type: K, listener: (this: MediaDevices, ev: MediaDevicesEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof MediaDevicesEventMap>(type: K, listener: (this: MediaDevices, ev: MediaDevicesEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var MediaDevices: {
-    prototype: MediaDevices;
-    new(): MediaDevices;
-};
-
-interface MediaElementAudioSourceNode extends AudioNode {
-}
-
-declare var MediaElementAudioSourceNode: {
-    prototype: MediaElementAudioSourceNode;
-    new(): MediaElementAudioSourceNode;
-};
-
-interface MediaEncryptedEvent extends Event {
-    readonly initData: ArrayBuffer | null;
-    readonly initDataType: string;
-}
-
-declare var MediaEncryptedEvent: {
-    prototype: MediaEncryptedEvent;
-    new(type: string, eventInitDict?: MediaEncryptedEventInit): MediaEncryptedEvent;
-};
-
-interface MediaError {
-    readonly code: number;
-    readonly message: string;
-    readonly msExtendedCode: number;
-    readonly MEDIA_ERR_ABORTED: number;
-    readonly MEDIA_ERR_DECODE: number;
-    readonly MEDIA_ERR_NETWORK: number;
-    readonly MEDIA_ERR_SRC_NOT_SUPPORTED: number;
-    readonly MS_MEDIA_ERR_ENCRYPTED: number;
-}
-
-declare var MediaError: {
-    prototype: MediaError;
-    new(): MediaError;
-    readonly MEDIA_ERR_ABORTED: number;
-    readonly MEDIA_ERR_DECODE: number;
-    readonly MEDIA_ERR_NETWORK: number;
-    readonly MEDIA_ERR_SRC_NOT_SUPPORTED: number;
-    readonly MS_MEDIA_ERR_ENCRYPTED: number;
-};
-
-interface MediaKeyMessageEvent extends Event {
-    readonly message: ArrayBuffer;
-    readonly messageType: MediaKeyMessageType;
-}
-
-declare var MediaKeyMessageEvent: {
-    prototype: MediaKeyMessageEvent;
-    new(type: string, eventInitDict?: MediaKeyMessageEventInit): MediaKeyMessageEvent;
-};
-
-interface MediaKeySession extends EventTarget {
-    readonly closed: Promise<void>;
-    readonly expiration: number;
-    readonly keyStatuses: MediaKeyStatusMap;
-    readonly sessionId: string;
-    close(): Promise<void>;
-    generateRequest(initDataType: string, initData: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null): Promise<void>;
-    load(sessionId: string): Promise<boolean>;
-    remove(): Promise<void>;
-    update(response: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null): Promise<void>;
-}
-
-declare var MediaKeySession: {
-    prototype: MediaKeySession;
-    new(): MediaKeySession;
-};
-
-interface MediaKeyStatusMap {
-    readonly size: number;
-    forEach(callback: Function, thisArg?: any): void;
-    get(keyId: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null): MediaKeyStatus;
-    has(keyId: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null): boolean;
-}
-
-declare var MediaKeyStatusMap: {
-    prototype: MediaKeyStatusMap;
-    new(): MediaKeyStatusMap;
-};
-
-interface MediaKeySystemAccess {
-    readonly keySystem: string;
-    createMediaKeys(): Promise<MediaKeys>;
-    getConfiguration(): MediaKeySystemConfiguration;
-}
-
-declare var MediaKeySystemAccess: {
-    prototype: MediaKeySystemAccess;
-    new(): MediaKeySystemAccess;
-};
-
-interface MediaKeys {
-    createSession(sessionType?: MediaKeySessionType): MediaKeySession;
-    setServerCertificate(serverCertificate: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null): Promise<void>;
-}
-
-declare var MediaKeys: {
-    prototype: MediaKeys;
-    new(): MediaKeys;
-};
-
-interface MediaList {
-    readonly length: number;
-    mediaText: string;
-    appendMedium(medium: string): void;
-    deleteMedium(medium: string): void;
-    item(index: number): string | null;
-    toString(): number;
-    [index: number]: string;
-}
-
-declare var MediaList: {
-    prototype: MediaList;
-    new(): MediaList;
-};
-
-interface MediaQueryList {
-    readonly matches: boolean;
-    readonly media: string;
-    addListener(listener: MediaQueryListListener): void;
-    removeListener(listener: MediaQueryListListener): void;
-}
-
-declare var MediaQueryList: {
-    prototype: MediaQueryList;
-    new(): MediaQueryList;
-};
-
-interface MediaSource extends EventTarget {
-    readonly activeSourceBuffers: SourceBufferList;
-    duration: number;
-    readonly readyState: string;
-    readonly sourceBuffers: SourceBufferList;
-    addSourceBuffer(type: string): SourceBuffer;
-    endOfStream(error?: number): void;
-    removeSourceBuffer(sourceBuffer: SourceBuffer): void;
-}
-
-declare var MediaSource: {
-    prototype: MediaSource;
-    new(): MediaSource;
-    isTypeSupported(type: string): boolean;
-};
-
-interface MediaStreamEventMap {
-    "active": Event;
-    "addtrack": MediaStreamTrackEvent;
-    "inactive": Event;
-    "removetrack": MediaStreamTrackEvent;
-}
-
-interface MediaStream extends EventTarget {
-    readonly active: boolean;
-    readonly id: string;
-    onactive: ((this: MediaStream, ev: Event) => any) | null;
-    onaddtrack: ((this: MediaStream, ev: MediaStreamTrackEvent) => any) | null;
-    oninactive: ((this: MediaStream, ev: Event) => any) | null;
-    onremovetrack: ((this: MediaStream, ev: MediaStreamTrackEvent) => any) | null;
-    addTrack(track: MediaStreamTrack): void;
-    clone(): MediaStream;
-    getAudioTracks(): MediaStreamTrack[];
-    getTrackById(trackId: string): MediaStreamTrack | null;
-    getTracks(): MediaStreamTrack[];
-    getVideoTracks(): MediaStreamTrack[];
-    removeTrack(track: MediaStreamTrack): void;
-    stop(): void;
-    addEventListener<K extends keyof MediaStreamEventMap>(type: K, listener: (this: MediaStream, ev: MediaStreamEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof MediaStreamEventMap>(type: K, listener: (this: MediaStream, ev: MediaStreamEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var MediaStream: {
-    prototype: MediaStream;
-    new(): MediaStream;
-    new(stream: MediaStream): MediaStream;
-    new(tracks: MediaStreamTrack[]): MediaStream;
-};
-
-interface MediaStreamAudioSourceNode extends AudioNode {
-}
-
-declare var MediaStreamAudioSourceNode: {
-    prototype: MediaStreamAudioSourceNode;
-    new(): MediaStreamAudioSourceNode;
-};
-
-interface MediaStreamError {
-    readonly constraintName: string | null;
-    readonly message: string | null;
-    readonly name: string;
-}
-
-declare var MediaStreamError: {
-    prototype: MediaStreamError;
-    new(): MediaStreamError;
-};
-
-interface MediaStreamErrorEvent extends Event {
-    readonly error: MediaStreamError | null;
-}
-
-declare var MediaStreamErrorEvent: {
-    prototype: MediaStreamErrorEvent;
-    new(typeArg: string, eventInitDict?: MediaStreamErrorEventInit): MediaStreamErrorEvent;
-};
-
-interface MediaStreamEvent extends Event {
-    readonly stream: MediaStream | null;
-}
-
-declare var MediaStreamEvent: {
-    prototype: MediaStreamEvent;
-    new(type: string, eventInitDict: MediaStreamEventInit): MediaStreamEvent;
-};
-
-interface MediaStreamTrackEventMap {
-    "ended": MediaStreamErrorEvent;
-    "mute": Event;
-    "overconstrained": MediaStreamErrorEvent;
-    "unmute": Event;
-}
-
-interface MediaStreamTrack extends EventTarget {
-    enabled: boolean;
-    readonly id: string;
-    readonly kind: string;
-    readonly label: string;
-    readonly muted: boolean;
-    onended: ((this: MediaStreamTrack, ev: MediaStreamErrorEvent) => any) | null;
-    onmute: ((this: MediaStreamTrack, ev: Event) => any) | null;
-    onoverconstrained: ((this: MediaStreamTrack, ev: MediaStreamErrorEvent) => any) | null;
-    onunmute: ((this: MediaStreamTrack, ev: Event) => any) | null;
-    readonly readonly: boolean;
-    readonly readyState: MediaStreamTrackState;
-    readonly remote: boolean;
-    applyConstraints(constraints: MediaTrackConstraints): Promise<void>;
-    clone(): MediaStreamTrack;
-    getCapabilities(): MediaTrackCapabilities;
-    getConstraints(): MediaTrackConstraints;
-    getSettings(): MediaTrackSettings;
-    stop(): void;
-    addEventListener<K extends keyof MediaStreamTrackEventMap>(type: K, listener: (this: MediaStreamTrack, ev: MediaStreamTrackEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof MediaStreamTrackEventMap>(type: K, listener: (this: MediaStreamTrack, ev: MediaStreamTrackEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var MediaStreamTrack: {
-    prototype: MediaStreamTrack;
-    new(): MediaStreamTrack;
-};
-
-interface MediaStreamTrackEvent extends Event {
-    readonly track: MediaStreamTrack;
-}
-
-declare var MediaStreamTrackEvent: {
-    prototype: MediaStreamTrackEvent;
-    new(typeArg: string, eventInitDict?: MediaStreamTrackEventInit): MediaStreamTrackEvent;
-};
-
-interface MessageChannel {
-    readonly port1: MessagePort;
-    readonly port2: MessagePort;
-}
-
-declare var MessageChannel: {
-    prototype: MessageChannel;
-    new(): MessageChannel;
-};
-
-interface MessageEvent extends Event {
-    readonly data: any;
-    readonly origin: string;
-    readonly ports: ReadonlyArray<MessagePort>;
-    readonly source: Window | null;
-    initMessageEvent(type: string, bubbles: boolean, cancelable: boolean, data: any, origin: string, lastEventId: string, source: Window): void;
-}
-
-declare var MessageEvent: {
-    prototype: MessageEvent;
-    new(type: string, eventInitDict?: MessageEventInit): MessageEvent;
-};
-
-interface MessagePortEventMap {
-    "message": MessageEvent;
-}
-
-interface MessagePort extends EventTarget {
-    onmessage: ((this: MessagePort, ev: MessageEvent) => any) | null;
-    close(): void;
-    postMessage(message?: any, transfer?: any[]): void;
-    start(): void;
-    addEventListener<K extends keyof MessagePortEventMap>(type: K, listener: (this: MessagePort, ev: MessagePortEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof MessagePortEventMap>(type: K, listener: (this: MessagePort, ev: MessagePortEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var MessagePort: {
-    prototype: MessagePort;
-    new(): MessagePort;
-};
-
-interface MimeType {
-    readonly description: string;
-    readonly enabledPlugin: Plugin;
-    readonly suffixes: string;
-    readonly type: string;
-}
-
-declare var MimeType: {
-    prototype: MimeType;
-    new(): MimeType;
-};
-
-interface MimeTypeArray {
-    readonly length: number;
-    item(index: number): Plugin;
-    namedItem(type: string): Plugin;
-    [index: number]: Plugin;
-}
-
-declare var MimeTypeArray: {
-    prototype: MimeTypeArray;
-    new(): MimeTypeArray;
-};
-
-interface MouseEvent extends UIEvent {
-    readonly altKey: boolean;
-    readonly button: number;
-    readonly buttons: number;
-    readonly clientX: number;
-    readonly clientY: number;
-    readonly ctrlKey: boolean;
-    /** @deprecated */
-    readonly fromElement: Element;
-    readonly layerX: number;
-    readonly layerY: number;
-    readonly metaKey: boolean;
-    readonly movementX: number;
-    readonly movementY: number;
-    readonly offsetX: number;
-    readonly offsetY: number;
-    readonly pageX: number;
-    readonly pageY: number;
-    readonly relatedTarget: EventTarget;
-    readonly screenX: number;
-    readonly screenY: number;
-    readonly shiftKey: boolean;
-    /** @deprecated */
-    readonly toElement: Element;
-    /** @deprecated */
-    readonly which: number;
-    readonly x: number;
-    readonly y: number;
-    getModifierState(keyArg: string): boolean;
-    initMouseEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number, screenXArg: number, screenYArg: number, clientXArg: number, clientYArg: number, ctrlKeyArg: boolean, altKeyArg: boolean, shiftKeyArg: boolean, metaKeyArg: boolean, buttonArg: number, relatedTargetArg: EventTarget | null): void;
-}
-
-declare var MouseEvent: {
-    prototype: MouseEvent;
-    new(typeArg: string, eventInitDict?: MouseEventInit): MouseEvent;
-};
-
-interface MutationEvent extends Event {
-    readonly attrChange: number;
-    readonly attrName: string;
-    readonly newValue: string;
-    readonly prevValue: string;
-    readonly relatedNode: Node;
-    initMutationEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, relatedNodeArg: Node, prevValueArg: string, newValueArg: string, attrNameArg: string, attrChangeArg: number): void;
-    readonly ADDITION: number;
-    readonly MODIFICATION: number;
-    readonly REMOVAL: number;
-}
-
-declare var MutationEvent: {
-    prototype: MutationEvent;
-    new(): MutationEvent;
-    readonly ADDITION: number;
-    readonly MODIFICATION: number;
-    readonly REMOVAL: number;
-};
-
-interface MutationObserver {
-    disconnect(): void;
-    observe(target: Node, options: MutationObserverInit): void;
-    takeRecords(): MutationRecord[];
-}
-
-declare var MutationObserver: {
-    prototype: MutationObserver;
-    new(callback: MutationCallback): MutationObserver;
-};
-
-interface MutationRecord {
-    readonly addedNodes: NodeList;
-    readonly attributeName: string | null;
-    readonly attributeNamespace: string | null;
-    readonly nextSibling: Node | null;
-    readonly oldValue: string | null;
-    readonly previousSibling: Node | null;
-    readonly removedNodes: NodeList;
-    readonly target: Node;
-    readonly type: MutationRecordType;
-}
-
-declare var MutationRecord: {
-    prototype: MutationRecord;
-    new(): MutationRecord;
-};
-
-interface NamedNodeMap {
-    readonly length: number;
-    getNamedItem(qualifiedName: string): Attr | null;
-    getNamedItemNS(namespace: string | null, localName: string): Attr | null;
-    item(index: number): Attr | null;
-    removeNamedItem(qualifiedName: string): Attr;
-    removeNamedItemNS(namespace: string | null, localName: string): Attr;
-    setNamedItem(attr: Attr): Attr | null;
-    setNamedItemNS(attr: Attr): Attr | null;
-    [index: number]: Attr;
-}
-
-declare var NamedNodeMap: {
-    prototype: NamedNodeMap;
-    new(): NamedNodeMap;
-};
-
-interface Navigator extends NavigatorID, NavigatorOnLine, NavigatorContentUtils, NavigatorStorageUtils, MSNavigatorDoNotTrack, MSFileSaver, NavigatorBeacon, NavigatorConcurrentHardware, NavigatorUserMedia, NavigatorLanguage {
-    readonly activeVRDisplays: ReadonlyArray<VRDisplay>;
-    readonly authentication: WebAuthentication;
-    readonly cookieEnabled: boolean;
-    readonly doNotTrack: string | null;
-    gamepadInputEmulation: GamepadInputEmulationType;
-    readonly geolocation: Geolocation;
-    readonly maxTouchPoints: number;
-    readonly mimeTypes: MimeTypeArray;
-    readonly msManipulationViewsEnabled: boolean;
-    readonly msMaxTouchPoints: number;
-    readonly msPointerEnabled: boolean;
-    readonly plugins: PluginArray;
-    readonly pointerEnabled: boolean;
-    readonly serviceWorker: ServiceWorkerContainer;
-    readonly webdriver: boolean;
-    getGamepads(): (Gamepad | null)[];
-    getVRDisplays(): Promise<VRDisplay[]>;
-    javaEnabled(): boolean;
-    msLaunchUri(uri: string, successCallback?: MSLaunchUriCallback, noHandlerCallback?: MSLaunchUriCallback): void;
-    requestMediaKeySystemAccess(keySystem: string, supportedConfigurations: MediaKeySystemConfiguration[]): Promise<MediaKeySystemAccess>;
-    vibrate(pattern: number | number[]): boolean;
-}
-
-declare var Navigator: {
-    prototype: Navigator;
-    new(): Navigator;
-};
-
-interface NavigatorBeacon {
-    sendBeacon(url: string, data?: Blob | Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | FormData | string | null): boolean;
-}
-
-interface NavigatorConcurrentHardware {
-    readonly hardwareConcurrency: number;
-}
-
-interface NavigatorContentUtils {
-}
-
-interface NavigatorID {
-    readonly appCodeName: string;
-    readonly appName: string;
-    readonly appVersion: string;
-    readonly platform: string;
-    readonly product: string;
-    readonly productSub: string;
-    readonly userAgent: string;
-    readonly vendor: string;
-    readonly vendorSub: string;
-}
-
-interface NavigatorLanguage {
-    readonly language: string;
-    readonly languages: ReadonlyArray<string>;
-}
-
-interface NavigatorOnLine {
-    readonly onLine: boolean;
-}
-
-interface NavigatorStorageUtils {
-}
-
-interface NavigatorUserMedia {
-    readonly mediaDevices: MediaDevices;
-    getDisplayMedia(constraints: MediaStreamConstraints): Promise<MediaStream>;
-    getUserMedia(constraints: MediaStreamConstraints, successCallback: NavigatorUserMediaSuccessCallback, errorCallback: NavigatorUserMediaErrorCallback): void;
-}
-
-interface Node extends EventTarget {
-    readonly baseURI: string | null;
-    readonly childNodes: NodeListOf<Node & ChildNode>;
-    readonly firstChild: Node | null;
-    readonly isConnected: boolean;
-    readonly lastChild: Node | null;
-    readonly localName: string | null;
-    readonly namespaceURI: string | null;
-    readonly nextSibling: Node | null;
-    readonly nodeName: string;
-    readonly nodeType: number;
-    nodeValue: string | null;
-    readonly ownerDocument: Document;
-    readonly parentElement: HTMLElement | null;
-    readonly parentNode: Node | null;
-    readonly previousSibling: Node | null;
-    textContent: string | null;
-    appendChild<T extends Node>(newChild: T): T;
-    cloneNode(deep?: boolean): Node;
-    compareDocumentPosition(other: Node): number;
-    contains(child: Node): boolean;
-    hasChildNodes(): boolean;
-    insertBefore<T extends Node>(newChild: T, refChild: Node | null): T;
-    isDefaultNamespace(namespaceURI: string | null): boolean;
-    isEqualNode(arg: Node): boolean;
-    isSameNode(other: Node): boolean;
-    lookupNamespaceURI(prefix: string | null): string | null;
-    lookupPrefix(namespaceURI: string | null): string | null;
-    normalize(): void;
-    removeChild<T extends Node>(oldChild: T): T;
-    replaceChild<T extends Node>(newChild: Node, oldChild: T): T;
-    readonly ATTRIBUTE_NODE: number;
-    readonly CDATA_SECTION_NODE: number;
-    readonly COMMENT_NODE: number;
-    readonly DOCUMENT_FRAGMENT_NODE: number;
-    readonly DOCUMENT_NODE: number;
-    readonly DOCUMENT_POSITION_CONTAINED_BY: number;
-    readonly DOCUMENT_POSITION_CONTAINS: number;
-    readonly DOCUMENT_POSITION_DISCONNECTED: number;
-    readonly DOCUMENT_POSITION_FOLLOWING: number;
-    readonly DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC: number;
-    readonly DOCUMENT_POSITION_PRECEDING: number;
-    readonly DOCUMENT_TYPE_NODE: number;
-    readonly ELEMENT_NODE: number;
-    readonly ENTITY_NODE: number;
-    readonly ENTITY_REFERENCE_NODE: number;
-    readonly NOTATION_NODE: number;
-    readonly PROCESSING_INSTRUCTION_NODE: number;
-    readonly TEXT_NODE: number;
-}
-
-declare var Node: {
-    prototype: Node;
-    new(): Node;
-    readonly ATTRIBUTE_NODE: number;
-    readonly CDATA_SECTION_NODE: number;
-    readonly COMMENT_NODE: number;
-    readonly DOCUMENT_FRAGMENT_NODE: number;
-    readonly DOCUMENT_NODE: number;
-    readonly DOCUMENT_POSITION_CONTAINED_BY: number;
-    readonly DOCUMENT_POSITION_CONTAINS: number;
-    readonly DOCUMENT_POSITION_DISCONNECTED: number;
-    readonly DOCUMENT_POSITION_FOLLOWING: number;
-    readonly DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC: number;
-    readonly DOCUMENT_POSITION_PRECEDING: number;
-    readonly DOCUMENT_TYPE_NODE: number;
-    readonly ELEMENT_NODE: number;
-    readonly ENTITY_NODE: number;
-    readonly ENTITY_REFERENCE_NODE: number;
-    readonly NOTATION_NODE: number;
-    readonly PROCESSING_INSTRUCTION_NODE: number;
-    readonly TEXT_NODE: number;
-};
-
-interface NodeFilter {
-    acceptNode(node: Node): number;
-}
-
-declare var NodeFilter: {
-    readonly FILTER_ACCEPT: number;
-    readonly FILTER_REJECT: number;
-    readonly FILTER_SKIP: number;
-    readonly SHOW_ALL: number;
-    readonly SHOW_ATTRIBUTE: number;
-    readonly SHOW_CDATA_SECTION: number;
-    readonly SHOW_COMMENT: number;
-    readonly SHOW_DOCUMENT: number;
-    readonly SHOW_DOCUMENT_FRAGMENT: number;
-    readonly SHOW_DOCUMENT_TYPE: number;
-    readonly SHOW_ELEMENT: number;
-    readonly SHOW_ENTITY: number;
-    readonly SHOW_ENTITY_REFERENCE: number;
-    readonly SHOW_NOTATION: number;
-    readonly SHOW_PROCESSING_INSTRUCTION: number;
-    readonly SHOW_TEXT: number;
-};
-
-interface NodeIterator {
-    /** @deprecated */
-    readonly expandEntityReferences: boolean;
-    readonly filter: NodeFilter | null;
-    readonly root: Node;
-    readonly whatToShow: number;
-    detach(): void;
-    nextNode(): Node | null;
-    previousNode(): Node | null;
-}
-
-declare var NodeIterator: {
-    prototype: NodeIterator;
-    new(): NodeIterator;
-};
-
-interface NodeList {
-    readonly length: number;
-    item(index: number): Node;
-    [index: number]: Node;
-}
-
-declare var NodeList: {
-    prototype: NodeList;
-    new(): NodeList;
-};
-
-interface NodeListOf<TNode extends Node> extends NodeList {
-    length: number;
-    item(index: number): TNode;
-    [index: number]: TNode;
-}
-
-interface NodeSelector {
-    querySelector<K extends keyof HTMLElementTagNameMap>(selectors: K): HTMLElementTagNameMap[K] | null;
-    querySelector<K extends keyof SVGElementTagNameMap>(selectors: K): SVGElementTagNameMap[K] | null;
-    querySelector<E extends Element = Element>(selectors: string): E | null;
-    querySelectorAll<K extends keyof HTMLElementTagNameMap>(selectors: K): NodeListOf<HTMLElementTagNameMap[K]>;
-    querySelectorAll<K extends keyof SVGElementTagNameMap>(selectors: K): NodeListOf<SVGElementTagNameMap[K]>;
-    querySelectorAll<E extends Element = Element>(selectors: string): NodeListOf<E>;
-}
-
-interface NotificationEventMap {
-    "click": Event;
-    "close": Event;
-    "error": Event;
-    "show": Event;
-}
-
-interface Notification extends EventTarget {
-    readonly body: string | null;
-    readonly data: any;
-    readonly dir: NotificationDirection;
-    readonly icon: string | null;
-    readonly lang: string | null;
-    onclick: ((this: Notification, ev: Event) => any) | null;
-    onclose: ((this: Notification, ev: Event) => any) | null;
-    onerror: ((this: Notification, ev: Event) => any) | null;
-    onshow: ((this: Notification, ev: Event) => any) | null;
-    readonly permission: NotificationPermission;
-    readonly tag: string | null;
-    readonly title: string;
-    close(): void;
-    addEventListener<K extends keyof NotificationEventMap>(type: K, listener: (this: Notification, ev: NotificationEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof NotificationEventMap>(type: K, listener: (this: Notification, ev: NotificationEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var Notification: {
-    prototype: Notification;
-    new(title: string, options?: NotificationOptions): Notification;
-    requestPermission(callback?: NotificationPermissionCallback): Promise<NotificationPermission>;
-};
-
-interface OES_element_index_uint {
-}
-
-declare var OES_element_index_uint: {
-    prototype: OES_element_index_uint;
-    new(): OES_element_index_uint;
-};
-
-interface OES_standard_derivatives {
-    readonly FRAGMENT_SHADER_DERIVATIVE_HINT_OES: number;
-}
-
-declare var OES_standard_derivatives: {
-    prototype: OES_standard_derivatives;
-    new(): OES_standard_derivatives;
-    readonly FRAGMENT_SHADER_DERIVATIVE_HINT_OES: number;
-};
-
-interface OES_texture_float {
-}
-
-declare var OES_texture_float: {
-    prototype: OES_texture_float;
-    new(): OES_texture_float;
-};
-
-interface OES_texture_float_linear {
-}
-
-declare var OES_texture_float_linear: {
-    prototype: OES_texture_float_linear;
-    new(): OES_texture_float_linear;
-};
-
-interface OES_texture_half_float {
-    readonly HALF_FLOAT_OES: number;
-}
-
-declare var OES_texture_half_float: {
-    prototype: OES_texture_half_float;
-    new(): OES_texture_half_float;
-    readonly HALF_FLOAT_OES: number;
-};
-
-interface OES_texture_half_float_linear {
-}
-
-declare var OES_texture_half_float_linear: {
-    prototype: OES_texture_half_float_linear;
-    new(): OES_texture_half_float_linear;
-};
-
-interface OES_vertex_array_object {
-    readonly VERTEX_ARRAY_BINDING_OES: number;
-    bindVertexArrayOES(arrayObject: WebGLVertexArrayObjectOES): void;
-    createVertexArrayOES(): WebGLVertexArrayObjectOES;
-    deleteVertexArrayOES(arrayObject: WebGLVertexArrayObjectOES): void;
-    isVertexArrayOES(value: any): value is WebGLVertexArrayObjectOES;
-}
-
-interface OfflineAudioCompletionEvent extends Event {
-    readonly renderedBuffer: AudioBuffer;
-}
-
-declare var OfflineAudioCompletionEvent: {
-    prototype: OfflineAudioCompletionEvent;
-    new(): OfflineAudioCompletionEvent;
-};
-
-interface OfflineAudioContextEventMap extends AudioContextEventMap {
-    "complete": OfflineAudioCompletionEvent;
-}
-
-interface OfflineAudioContext extends AudioContextBase {
-    readonly length: number;
-    oncomplete: ((this: OfflineAudioContext, ev: OfflineAudioCompletionEvent) => any) | null;
-    startRendering(): Promise<AudioBuffer>;
-    suspend(suspendTime: number): Promise<void>;
-    addEventListener<K extends keyof OfflineAudioContextEventMap>(type: K, listener: (this: OfflineAudioContext, ev: OfflineAudioContextEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof OfflineAudioContextEventMap>(type: K, listener: (this: OfflineAudioContext, ev: OfflineAudioContextEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var OfflineAudioContext: {
-    prototype: OfflineAudioContext;
-    new(numberOfChannels: number, length: number, sampleRate: number): OfflineAudioContext;
-};
-
-interface OscillatorNodeEventMap {
-    "ended": Event;
-}
-
-interface OscillatorNode extends AudioNode {
-    readonly detune: AudioParam;
-    readonly frequency: AudioParam;
-    onended: ((this: OscillatorNode, ev: Event) => any) | null;
-    type: OscillatorType;
-    setPeriodicWave(periodicWave: PeriodicWave): void;
-    start(when?: number): void;
-    stop(when?: number): void;
-    addEventListener<K extends keyof OscillatorNodeEventMap>(type: K, listener: (this: OscillatorNode, ev: OscillatorNodeEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof OscillatorNodeEventMap>(type: K, listener: (this: OscillatorNode, ev: OscillatorNodeEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var OscillatorNode: {
-    prototype: OscillatorNode;
-    new(): OscillatorNode;
-};
-
-interface OverflowEvent extends UIEvent {
-    readonly horizontalOverflow: boolean;
-    readonly orient: number;
-    readonly verticalOverflow: boolean;
-    readonly BOTH: number;
-    readonly HORIZONTAL: number;
-    readonly VERTICAL: number;
-}
-
-declare var OverflowEvent: {
-    prototype: OverflowEvent;
-    new(): OverflowEvent;
-    readonly BOTH: number;
-    readonly HORIZONTAL: number;
-    readonly VERTICAL: number;
-};
-
-interface PageTransitionEvent extends Event {
-    readonly persisted: boolean;
-}
-
-declare var PageTransitionEvent: {
-    prototype: PageTransitionEvent;
-    new(): PageTransitionEvent;
-};
-
-interface PannerNode extends AudioNode {
-    coneInnerAngle: number;
-    coneOuterAngle: number;
-    coneOuterGain: number;
-    distanceModel: DistanceModelType;
-    maxDistance: number;
-    panningModel: PanningModelType;
-    refDistance: number;
-    rolloffFactor: number;
-    /** @deprecated */
-    setOrientation(x: number, y: number, z: number): void;
-    /** @deprecated */
-    setPosition(x: number, y: number, z: number): void;
-    /** @deprecated */
-    setVelocity(x: number, y: number, z: number): void;
-}
-
-declare var PannerNode: {
-    prototype: PannerNode;
-    new(): PannerNode;
-};
-
-interface ParentNode {
-    readonly childElementCount: number;
-    readonly firstElementChild: Element | null;
-    readonly lastElementChild: Element | null;
-}
-
-interface ParentNode {
-    readonly children: HTMLCollection;
-    querySelector<K extends keyof HTMLElementTagNameMap>(selectors: K): HTMLElementTagNameMap[K] | null;
-    querySelector<K extends keyof SVGElementTagNameMap>(selectors: K): SVGElementTagNameMap[K] | null;
-    querySelector<E extends Element = Element>(selectors: string): E | null;
-    querySelectorAll<K extends keyof HTMLElementTagNameMap>(selectors: K): NodeListOf<HTMLElementTagNameMap[K]>;
-    querySelectorAll<K extends keyof SVGElementTagNameMap>(selectors: K): NodeListOf<SVGElementTagNameMap[K]>;
-    querySelectorAll<E extends Element = Element>(selectors: string): NodeListOf<E>;
-}
-
-interface Path2D extends CanvasPathMethods {
-}
-
-declare var Path2D: {
-    prototype: Path2D;
-    new(d?: Path2D | string): Path2D;
-};
-
-interface PaymentAddress {
-    readonly addressLine: string[];
-    readonly city: string;
-    readonly country: string;
-    readonly dependentLocality: string;
-    readonly languageCode: string;
-    readonly organization: string;
-    readonly phone: string;
-    readonly postalCode: string;
-    readonly recipient: string;
-    readonly region: string;
-    readonly sortingCode: string;
-    toJSON(): any;
-}
-
-declare var PaymentAddress: {
-    prototype: PaymentAddress;
-    new(): PaymentAddress;
-};
-
-interface PaymentRequestEventMap {
-    "shippingaddresschange": Event;
-    "shippingoptionchange": Event;
-}
-
-interface PaymentRequest extends EventTarget {
-    readonly id: string;
-    onshippingaddresschange: ((this: PaymentRequest, ev: Event) => any) | null;
-    onshippingoptionchange: ((this: PaymentRequest, ev: Event) => any) | null;
-    readonly shippingAddress: PaymentAddress | null;
-    readonly shippingOption: string | null;
-    readonly shippingType: PaymentShippingType | null;
-    abort(): Promise<void>;
-    canMakePayment(): Promise<boolean>;
-    show(): Promise<PaymentResponse>;
-    addEventListener<K extends keyof PaymentRequestEventMap>(type: K, listener: (this: PaymentRequest, ev: PaymentRequestEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof PaymentRequestEventMap>(type: K, listener: (this: PaymentRequest, ev: PaymentRequestEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var PaymentRequest: {
-    prototype: PaymentRequest;
-    new(methodData: PaymentMethodData[], details: PaymentDetailsInit, options?: PaymentOptions): PaymentRequest;
-};
-
-interface PaymentRequestUpdateEvent extends Event {
-    updateWith(detailsPromise: Promise<PaymentDetailsUpdate>): void;
-}
-
-declare var PaymentRequestUpdateEvent: {
-    prototype: PaymentRequestUpdateEvent;
-    new(type: string, eventInitDict?: PaymentRequestUpdateEventInit): PaymentRequestUpdateEvent;
-};
-
-interface PaymentResponse {
-    readonly details: any;
-    readonly methodName: string;
-    readonly payerEmail: string | null;
-    readonly payerName: string | null;
-    readonly payerPhone: string | null;
-    readonly requestId: string;
-    readonly shippingAddress: PaymentAddress | null;
-    readonly shippingOption: string | null;
-    complete(result?: PaymentComplete): Promise<void>;
-    toJSON(): any;
-}
-
-declare var PaymentResponse: {
-    prototype: PaymentResponse;
-    new(): PaymentResponse;
-};
-
-interface PerfWidgetExternal {
-    readonly activeNetworkRequestCount: number;
-    readonly averageFrameTime: number;
-    readonly averagePaintTime: number;
-    readonly extraInformationEnabled: boolean;
-    readonly independentRenderingEnabled: boolean;
-    readonly irDisablingContentString: string;
-    readonly irStatusAvailable: boolean;
-    readonly maxCpuSpeed: number;
-    readonly paintRequestsPerSecond: number;
-    readonly performanceCounter: number;
-    readonly performanceCounterFrequency: number;
-    addEventListener(eventType: string, callback: Function): void;
-    getMemoryUsage(): number;
-    getProcessCpuUsage(): number;
-    getRecentCpuUsage(last: number | null): any;
-    getRecentFrames(last: number | null): any;
-    getRecentMemoryUsage(last: number | null): any;
-    getRecentPaintRequests(last: number | null): any;
-    removeEventListener(eventType: string, callback: Function): void;
-    repositionWindow(x: number, y: number): void;
-    resizeWindow(width: number, height: number): void;
-}
-
-declare var PerfWidgetExternal: {
-    prototype: PerfWidgetExternal;
-    new(): PerfWidgetExternal;
-};
-
-interface Performance {
-    /** @deprecated */
-    readonly navigation: PerformanceNavigation;
-    readonly timeOrigin: number;
-    /** @deprecated */
-    readonly timing: PerformanceTiming;
-    clearMarks(markName?: string): void;
-    clearMeasures(measureName?: string): void;
-    clearResourceTimings(): void;
-    getEntries(): any;
-    getEntriesByName(name: string, type?: string): any;
-    getEntriesByType(type: string): any;
-    /** @deprecated */
-    getMarks(markName?: string): any;
-    /** @deprecated */
-    getMeasures(measureName?: string): any;
-    mark(markName: string): void;
-    measure(measureName: string, startMarkName?: string, endMarkName?: string): void;
-    now(): number;
-    setResourceTimingBufferSize(maxSize: number): void;
-    toJSON(): any;
-}
-
-declare var Performance: {
-    prototype: Performance;
-    new(): Performance;
-};
-
-interface PerformanceEntry {
-    readonly duration: number;
-    readonly entryType: string;
-    readonly name: string;
-    readonly startTime: number;
-    toJSON(): any;
-}
-
-declare var PerformanceEntry: {
-    prototype: PerformanceEntry;
-    new(): PerformanceEntry;
-};
-
-interface PerformanceMark extends PerformanceEntry {
-}
-
-declare var PerformanceMark: {
-    prototype: PerformanceMark;
-    new(): PerformanceMark;
-};
-
-interface PerformanceMeasure extends PerformanceEntry {
-}
-
-declare var PerformanceMeasure: {
-    prototype: PerformanceMeasure;
-    new(): PerformanceMeasure;
-};
-
-interface PerformanceNavigation {
-    readonly redirectCount: number;
-    readonly type: number;
-    toJSON(): any;
-    readonly TYPE_BACK_FORWARD: number;
-    readonly TYPE_NAVIGATE: number;
-    readonly TYPE_RELOAD: number;
-    readonly TYPE_RESERVED: number;
-}
-
-declare var PerformanceNavigation: {
-    prototype: PerformanceNavigation;
-    new(): PerformanceNavigation;
-    readonly TYPE_BACK_FORWARD: number;
-    readonly TYPE_NAVIGATE: number;
-    readonly TYPE_RELOAD: number;
-    readonly TYPE_RESERVED: number;
-};
-
-interface PerformanceNavigationTiming extends PerformanceEntry {
-    /** @deprecated */
-    readonly connectEnd: number;
-    /** @deprecated */
-    readonly connectStart: number;
-    readonly domComplete: number;
-    readonly domContentLoadedEventEnd: number;
-    readonly domContentLoadedEventStart: number;
-    readonly domInteractive: number;
-    /** @deprecated */
-    readonly domLoading: number;
-    /** @deprecated */
-    readonly domainLookupEnd: number;
-    /** @deprecated */
-    readonly domainLookupStart: number;
-    /** @deprecated */
-    readonly fetchStart: number;
-    readonly loadEventEnd: number;
-    readonly loadEventStart: number;
-    /** @deprecated */
-    readonly navigationStart: number;
-    readonly redirectCount: number;
-    /** @deprecated */
-    readonly redirectEnd: number;
-    /** @deprecated */
-    readonly redirectStart: number;
-    /** @deprecated */
-    readonly requestStart: number;
-    /** @deprecated */
-    readonly responseEnd: number;
-    /** @deprecated */
-    readonly responseStart: number;
-    readonly type: NavigationType;
-    readonly unloadEventEnd: number;
-    readonly unloadEventStart: number;
-    readonly workerStart: number;
-}
-
-declare var PerformanceNavigationTiming: {
-    prototype: PerformanceNavigationTiming;
-    new(): PerformanceNavigationTiming;
-};
-
-interface PerformanceResourceTiming extends PerformanceEntry {
-    readonly connectEnd: number;
-    readonly connectStart: number;
-    readonly domainLookupEnd: number;
-    readonly domainLookupStart: number;
-    readonly fetchStart: number;
-    readonly initiatorType: string;
-    readonly redirectEnd: number;
-    readonly redirectStart: number;
-    readonly requestStart: number;
-    readonly responseEnd: number;
-    readonly responseStart: number;
-    readonly workerStart: number;
-}
-
-declare var PerformanceResourceTiming: {
-    prototype: PerformanceResourceTiming;
-    new(): PerformanceResourceTiming;
-};
-
-interface PerformanceTiming {
-    readonly connectEnd: number;
-    readonly connectStart: number;
-    readonly domComplete: number;
-    readonly domContentLoadedEventEnd: number;
-    readonly domContentLoadedEventStart: number;
-    readonly domInteractive: number;
-    readonly domLoading: number;
-    readonly domainLookupEnd: number;
-    readonly domainLookupStart: number;
-    readonly fetchStart: number;
-    readonly loadEventEnd: number;
-    readonly loadEventStart: number;
-    readonly msFirstPaint: number;
-    readonly navigationStart: number;
-    readonly redirectEnd: number;
-    readonly redirectStart: number;
-    readonly requestStart: number;
-    readonly responseEnd: number;
-    readonly responseStart: number;
-    readonly secureConnectionStart: number;
-    readonly unloadEventEnd: number;
-    readonly unloadEventStart: number;
-    toJSON(): any;
-}
-
-declare var PerformanceTiming: {
-    prototype: PerformanceTiming;
-    new(): PerformanceTiming;
-};
-
-interface PeriodicWave {
-}
-
-declare var PeriodicWave: {
-    prototype: PeriodicWave;
-    new(): PeriodicWave;
-};
-
-interface PermissionRequest extends DeferredPermissionRequest {
-    readonly state: MSWebViewPermissionState;
-    defer(): void;
-}
-
-declare var PermissionRequest: {
-    prototype: PermissionRequest;
-    new(): PermissionRequest;
-};
-
-interface PermissionRequestedEvent extends Event {
-    readonly permissionRequest: PermissionRequest;
-}
-
-declare var PermissionRequestedEvent: {
-    prototype: PermissionRequestedEvent;
-    new(): PermissionRequestedEvent;
-};
-
-interface Plugin {
-    readonly description: string;
-    readonly filename: string;
-    readonly length: number;
-    readonly name: string;
-    readonly version: string;
-    item(index: number): MimeType;
-    namedItem(type: string): MimeType;
-    [index: number]: MimeType;
-}
-
-declare var Plugin: {
-    prototype: Plugin;
-    new(): Plugin;
-};
-
-interface PluginArray {
-    readonly length: number;
-    item(index: number): Plugin;
-    namedItem(name: string): Plugin;
-    refresh(reload?: boolean): void;
-    [index: number]: Plugin;
-}
-
-declare var PluginArray: {
-    prototype: PluginArray;
-    new(): PluginArray;
-};
-
-interface PointerEvent extends MouseEvent {
-    readonly currentPoint: any;
-    readonly height: number;
-    readonly hwTimestamp: number;
-    readonly intermediatePoints: any;
-    readonly isPrimary: boolean;
-    readonly pointerId: number;
-    readonly pointerType: any;
-    readonly pressure: number;
-    readonly rotation: number;
-    readonly tiltX: number;
-    readonly tiltY: number;
-    readonly width: number;
-    getCurrentPoint(element: Element): void;
-    getIntermediatePoints(element: Element): void;
-    initPointerEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number, screenXArg: number, screenYArg: number, clientXArg: number, clientYArg: number, ctrlKeyArg: boolean, altKeyArg: boolean, shiftKeyArg: boolean, metaKeyArg: boolean, buttonArg: number, relatedTargetArg: EventTarget, offsetXArg: number, offsetYArg: number, widthArg: number, heightArg: number, pressure: number, rotation: number, tiltX: number, tiltY: number, pointerIdArg: number, pointerType: any, hwTimestampArg: number, isPrimary: boolean): void;
-}
-
-declare var PointerEvent: {
-    prototype: PointerEvent;
-    new(typeArg: string, eventInitDict?: PointerEventInit): PointerEvent;
-};
-
-interface PopStateEvent extends Event {
-    readonly state: any;
-}
-
-declare var PopStateEvent: {
-    prototype: PopStateEvent;
-    new(type: string, eventInitDict?: PopStateEventInit): PopStateEvent;
-};
-
-interface Position {
-    readonly coords: Coordinates;
-    readonly timestamp: number;
-}
-
-declare var Position: {
-    prototype: Position;
-    new(): Position;
-};
-
-interface PositionError {
-    readonly code: number;
-    readonly message: string;
-    toString(): string;
-    readonly PERMISSION_DENIED: number;
-    readonly POSITION_UNAVAILABLE: number;
-    readonly TIMEOUT: number;
-}
-
-declare var PositionError: {
-    prototype: PositionError;
-    new(): PositionError;
-    readonly PERMISSION_DENIED: number;
-    readonly POSITION_UNAVAILABLE: number;
-    readonly TIMEOUT: number;
-};
-
-interface ProcessingInstruction extends CharacterData {
-    readonly target: string;
-}
-
-declare var ProcessingInstruction: {
-    prototype: ProcessingInstruction;
-    new(): ProcessingInstruction;
-};
-
-interface ProgressEvent extends Event {
-    readonly lengthComputable: boolean;
-    readonly loaded: number;
-    readonly total: number;
-    initProgressEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, lengthComputableArg: boolean, loadedArg: number, totalArg: number): void;
-}
-
-declare var ProgressEvent: {
-    prototype: ProgressEvent;
-    new(typeArg: string, eventInitDict?: ProgressEventInit): ProgressEvent;
-};
-
-interface PromiseRejectionEvent extends Event {
-    readonly promise: PromiseLike<any>;
-    readonly reason: any;
-}
-
-interface PromiseRejectionEventInit extends EventInit {
-    promise: PromiseLike<any>;
-    reason?: any;
-}
-
-interface PushManager {
-    readonly supportedContentEncodings: ReadonlyArray<string>;
-    getSubscription(): Promise<PushSubscription | null>;
-    permissionState(options?: PushSubscriptionOptionsInit): Promise<PushPermissionState>;
-    subscribe(options?: PushSubscriptionOptionsInit): Promise<PushSubscription>;
-}
-
-declare var PushManager: {
-    prototype: PushManager;
-    new(): PushManager;
-};
-
-interface PushSubscription {
-    readonly endpoint: string;
-    readonly expirationTime: number | null;
-    readonly options: PushSubscriptionOptions;
-    getKey(name: PushEncryptionKeyName): ArrayBuffer | null;
-    toJSON(): any;
-    unsubscribe(): Promise<boolean>;
-}
-
-declare var PushSubscription: {
-    prototype: PushSubscription;
-    new(): PushSubscription;
-};
-
-interface PushSubscriptionOptions {
-    readonly applicationServerKey: ArrayBuffer | null;
-    readonly userVisibleOnly: boolean;
-}
-
-declare var PushSubscriptionOptions: {
-    prototype: PushSubscriptionOptions;
-    new(): PushSubscriptionOptions;
-};
-
-interface RTCDTMFToneChangeEvent extends Event {
-    readonly tone: string;
-}
-
-declare var RTCDTMFToneChangeEvent: {
-    prototype: RTCDTMFToneChangeEvent;
-    new(typeArg: string, eventInitDict: RTCDTMFToneChangeEventInit): RTCDTMFToneChangeEvent;
-};
-
-interface RTCDtlsTransportEventMap {
-    "dtlsstatechange": RTCDtlsTransportStateChangedEvent;
-    "error": Event;
-}
-
-interface RTCDtlsTransport extends RTCStatsProvider {
-    ondtlsstatechange: ((this: RTCDtlsTransport, ev: RTCDtlsTransportStateChangedEvent) => any) | null;
-    onerror: ((this: RTCDtlsTransport, ev: Event) => any) | null;
-    readonly state: RTCDtlsTransportState;
-    readonly transport: RTCIceTransport;
-    getLocalParameters(): RTCDtlsParameters;
-    getRemoteCertificates(): ArrayBuffer[];
-    getRemoteParameters(): RTCDtlsParameters | null;
-    start(remoteParameters: RTCDtlsParameters): void;
-    stop(): void;
-    addEventListener<K extends keyof RTCDtlsTransportEventMap>(type: K, listener: (this: RTCDtlsTransport, ev: RTCDtlsTransportEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCDtlsTransportEventMap>(type: K, listener: (this: RTCDtlsTransport, ev: RTCDtlsTransportEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var RTCDtlsTransport: {
-    prototype: RTCDtlsTransport;
-    new(transport: RTCIceTransport): RTCDtlsTransport;
-};
-
-interface RTCDtlsTransportStateChangedEvent extends Event {
-    readonly state: RTCDtlsTransportState;
-}
-
-declare var RTCDtlsTransportStateChangedEvent: {
-    prototype: RTCDtlsTransportStateChangedEvent;
-    new(): RTCDtlsTransportStateChangedEvent;
-};
-
-interface RTCDtmfSenderEventMap {
-    "tonechange": RTCDTMFToneChangeEvent;
-}
-
-interface RTCDtmfSender extends EventTarget {
-    readonly canInsertDTMF: boolean;
-    readonly duration: number;
-    readonly interToneGap: number;
-    ontonechange: ((this: RTCDtmfSender, ev: RTCDTMFToneChangeEvent) => any) | null;
-    readonly sender: RTCRtpSender;
-    readonly toneBuffer: string;
-    insertDTMF(tones: string, duration?: number, interToneGap?: number): void;
-    addEventListener<K extends keyof RTCDtmfSenderEventMap>(type: K, listener: (this: RTCDtmfSender, ev: RTCDtmfSenderEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCDtmfSenderEventMap>(type: K, listener: (this: RTCDtmfSender, ev: RTCDtmfSenderEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var RTCDtmfSender: {
-    prototype: RTCDtmfSender;
-    new(sender: RTCRtpSender): RTCDtmfSender;
-};
-
-interface RTCIceCandidate {
-    candidate: string | null;
-    sdpMLineIndex: number | null;
-    sdpMid: string | null;
-    toJSON(): any;
-}
-
-declare var RTCIceCandidate: {
-    prototype: RTCIceCandidate;
-    new(candidateInitDict?: RTCIceCandidateInit): RTCIceCandidate;
-};
-
-interface RTCIceCandidatePairChangedEvent extends Event {
-    readonly pair: RTCIceCandidatePair;
-}
-
-declare var RTCIceCandidatePairChangedEvent: {
-    prototype: RTCIceCandidatePairChangedEvent;
-    new(): RTCIceCandidatePairChangedEvent;
-};
-
-interface RTCIceGathererEventMap {
-    "error": Event;
-    "localcandidate": RTCIceGathererEvent;
-}
-
-interface RTCIceGatherer extends RTCStatsProvider {
-    readonly component: RTCIceComponent;
-    onerror: ((this: RTCIceGatherer, ev: Event) => any) | null;
-    onlocalcandidate: ((this: RTCIceGatherer, ev: RTCIceGathererEvent) => any) | null;
-    createAssociatedGatherer(): RTCIceGatherer;
-    getLocalCandidates(): RTCIceCandidateDictionary[];
-    getLocalParameters(): RTCIceParameters;
-    addEventListener<K extends keyof RTCIceGathererEventMap>(type: K, listener: (this: RTCIceGatherer, ev: RTCIceGathererEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCIceGathererEventMap>(type: K, listener: (this: RTCIceGatherer, ev: RTCIceGathererEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var RTCIceGatherer: {
-    prototype: RTCIceGatherer;
-    new(options: RTCIceGatherOptions): RTCIceGatherer;
-};
-
-interface RTCIceGathererEvent extends Event {
-    readonly candidate: RTCIceCandidateDictionary | RTCIceCandidateComplete;
-}
-
-declare var RTCIceGathererEvent: {
-    prototype: RTCIceGathererEvent;
-    new(): RTCIceGathererEvent;
-};
-
-interface RTCIceTransportEventMap {
-    "candidatepairchange": RTCIceCandidatePairChangedEvent;
-    "icestatechange": RTCIceTransportStateChangedEvent;
-}
-
-interface RTCIceTransport extends RTCStatsProvider {
-    readonly component: RTCIceComponent;
-    readonly iceGatherer: RTCIceGatherer | null;
-    oncandidatepairchange: ((this: RTCIceTransport, ev: RTCIceCandidatePairChangedEvent) => any) | null;
-    onicestatechange: ((this: RTCIceTransport, ev: RTCIceTransportStateChangedEvent) => any) | null;
-    readonly role: RTCIceRole;
-    readonly state: RTCIceTransportState;
-    addRemoteCandidate(remoteCandidate: RTCIceCandidateDictionary | RTCIceCandidateComplete): void;
-    createAssociatedTransport(): RTCIceTransport;
-    getNominatedCandidatePair(): RTCIceCandidatePair | null;
-    getRemoteCandidates(): RTCIceCandidateDictionary[];
-    getRemoteParameters(): RTCIceParameters | null;
-    setRemoteCandidates(remoteCandidates: RTCIceCandidateDictionary[]): void;
-    start(gatherer: RTCIceGatherer, remoteParameters: RTCIceParameters, role?: RTCIceRole): void;
-    stop(): void;
-    addEventListener<K extends keyof RTCIceTransportEventMap>(type: K, listener: (this: RTCIceTransport, ev: RTCIceTransportEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCIceTransportEventMap>(type: K, listener: (this: RTCIceTransport, ev: RTCIceTransportEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var RTCIceTransport: {
-    prototype: RTCIceTransport;
-    new(): RTCIceTransport;
-};
-
-interface RTCIceTransportStateChangedEvent extends Event {
-    readonly state: RTCIceTransportState;
-}
-
-declare var RTCIceTransportStateChangedEvent: {
-    prototype: RTCIceTransportStateChangedEvent;
-    new(): RTCIceTransportStateChangedEvent;
-};
-
-interface RTCPeerConnectionEventMap {
-    "addstream": MediaStreamEvent;
-    "icecandidate": RTCPeerConnectionIceEvent;
-    "iceconnectionstatechange": Event;
-    "icegatheringstatechange": Event;
-    "negotiationneeded": Event;
-    "removestream": MediaStreamEvent;
-    "signalingstatechange": Event;
-}
-
-interface RTCPeerConnection extends EventTarget {
-    readonly canTrickleIceCandidates: boolean | null;
-    readonly iceConnectionState: RTCIceConnectionState;
-    readonly iceGatheringState: RTCIceGatheringState;
-    readonly localDescription: RTCSessionDescription | null;
-    onaddstream: ((this: RTCPeerConnection, ev: MediaStreamEvent) => any) | null;
-    onicecandidate: ((this: RTCPeerConnection, ev: RTCPeerConnectionIceEvent) => any) | null;
-    oniceconnectionstatechange: ((this: RTCPeerConnection, ev: Event) => any) | null;
-    onicegatheringstatechange: ((this: RTCPeerConnection, ev: Event) => any) | null;
-    onnegotiationneeded: ((this: RTCPeerConnection, ev: Event) => any) | null;
-    onremovestream: ((this: RTCPeerConnection, ev: MediaStreamEvent) => any) | null;
-    onsignalingstatechange: ((this: RTCPeerConnection, ev: Event) => any) | null;
-    readonly remoteDescription: RTCSessionDescription | null;
-    readonly signalingState: RTCSignalingState;
-    addIceCandidate(candidate: RTCIceCandidateInit | RTCIceCandidate): Promise<void>;
-    addStream(stream: MediaStream): void;
-    close(): void;
-    createAnswer(options?: RTCOfferOptions): Promise<RTCSessionDescriptionInit>;
-    createOffer(options?: RTCOfferOptions): Promise<RTCSessionDescriptionInit>;
-    getConfiguration(): RTCConfiguration;
-    getLocalStreams(): MediaStream[];
-    getRemoteStreams(): MediaStream[];
-    getStats(selector: MediaStreamTrack | null, successCallback?: RTCStatsCallback, failureCallback?: RTCPeerConnectionErrorCallback): Promise<RTCStatsReport>;
-    getStreamById(streamId: string): MediaStream | null;
-    removeStream(stream: MediaStream): void;
-    setLocalDescription(description: RTCSessionDescriptionInit): Promise<void>;
-    setRemoteDescription(description: RTCSessionDescriptionInit): Promise<void>;
-    addEventListener<K extends keyof RTCPeerConnectionEventMap>(type: K, listener: (this: RTCPeerConnection, ev: RTCPeerConnectionEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCPeerConnectionEventMap>(type: K, listener: (this: RTCPeerConnection, ev: RTCPeerConnectionEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var RTCPeerConnection: {
-    prototype: RTCPeerConnection;
-    new(configuration: RTCConfiguration): RTCPeerConnection;
-};
-
-interface RTCPeerConnectionIceEvent extends Event {
-    readonly candidate: RTCIceCandidate;
-}
-
-declare var RTCPeerConnectionIceEvent: {
-    prototype: RTCPeerConnectionIceEvent;
-    new(type: string, eventInitDict: RTCPeerConnectionIceEventInit): RTCPeerConnectionIceEvent;
-};
-
-interface RTCRtpReceiverEventMap {
-    "error": Event;
-    "msdecodercapacitychange": Event;
-    "msdsh": Event;
-}
-
-interface RTCRtpReceiver extends RTCStatsProvider {
-    onerror: ((this: RTCRtpReceiver, ev: Event) => any) | null;
-    onmsdecodercapacitychange: ((this: RTCRtpReceiver, ev: Event) => any) | null;
-    onmsdsh: ((this: RTCRtpReceiver, ev: Event) => any) | null;
-    readonly rtcpTransport: RTCDtlsTransport;
-    readonly track: MediaStreamTrack | null;
-    readonly transport: RTCDtlsTransport | RTCSrtpSdesTransport;
-    getContributingSources(): RTCRtpContributingSource[];
-    receive(parameters: RTCRtpParameters): void;
-    requestSendCSRC(csrc: number): void;
-    setTransport(transport: RTCDtlsTransport | RTCSrtpSdesTransport, rtcpTransport?: RTCDtlsTransport): void;
-    stop(): void;
-    addEventListener<K extends keyof RTCRtpReceiverEventMap>(type: K, listener: (this: RTCRtpReceiver, ev: RTCRtpReceiverEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCRtpReceiverEventMap>(type: K, listener: (this: RTCRtpReceiver, ev: RTCRtpReceiverEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var RTCRtpReceiver: {
-    prototype: RTCRtpReceiver;
-    new(transport: RTCDtlsTransport | RTCSrtpSdesTransport, kind: string, rtcpTransport?: RTCDtlsTransport): RTCRtpReceiver;
-    getCapabilities(kind?: string): RTCRtpCapabilities;
-};
-
-interface RTCRtpSenderEventMap {
-    "error": Event;
-    "ssrcconflict": RTCSsrcConflictEvent;
-}
-
-interface RTCRtpSender extends RTCStatsProvider {
-    onerror: ((this: RTCRtpSender, ev: Event) => any) | null;
-    onssrcconflict: ((this: RTCRtpSender, ev: RTCSsrcConflictEvent) => any) | null;
-    readonly rtcpTransport: RTCDtlsTransport;
-    readonly track: MediaStreamTrack;
-    readonly transport: RTCDtlsTransport | RTCSrtpSdesTransport;
-    send(parameters: RTCRtpParameters): void;
-    setTrack(track: MediaStreamTrack): void;
-    setTransport(transport: RTCDtlsTransport | RTCSrtpSdesTransport, rtcpTransport?: RTCDtlsTransport): void;
-    stop(): void;
-    addEventListener<K extends keyof RTCRtpSenderEventMap>(type: K, listener: (this: RTCRtpSender, ev: RTCRtpSenderEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCRtpSenderEventMap>(type: K, listener: (this: RTCRtpSender, ev: RTCRtpSenderEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var RTCRtpSender: {
-    prototype: RTCRtpSender;
-    new(track: MediaStreamTrack, transport: RTCDtlsTransport | RTCSrtpSdesTransport, rtcpTransport?: RTCDtlsTransport): RTCRtpSender;
-    getCapabilities(kind?: string): RTCRtpCapabilities;
-};
-
-interface RTCSessionDescription {
-    sdp: string | null;
-    type: RTCSdpType | null;
-    toJSON(): any;
-}
-
-declare var RTCSessionDescription: {
-    prototype: RTCSessionDescription;
-    new(descriptionInitDict?: RTCSessionDescriptionInit): RTCSessionDescription;
-};
-
-interface RTCSrtpSdesTransportEventMap {
-    "error": Event;
-}
-
-interface RTCSrtpSdesTransport extends EventTarget {
-    onerror: ((this: RTCSrtpSdesTransport, ev: Event) => any) | null;
-    readonly transport: RTCIceTransport;
-    addEventListener<K extends keyof RTCSrtpSdesTransportEventMap>(type: K, listener: (this: RTCSrtpSdesTransport, ev: RTCSrtpSdesTransportEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCSrtpSdesTransportEventMap>(type: K, listener: (this: RTCSrtpSdesTransport, ev: RTCSrtpSdesTransportEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var RTCSrtpSdesTransport: {
-    prototype: RTCSrtpSdesTransport;
-    new(transport: RTCIceTransport, encryptParameters: RTCSrtpSdesParameters, decryptParameters: RTCSrtpSdesParameters): RTCSrtpSdesTransport;
-    getLocalParameters(): RTCSrtpSdesParameters[];
-};
-
-interface RTCSsrcConflictEvent extends Event {
-    readonly ssrc: number;
-}
-
-declare var RTCSsrcConflictEvent: {
-    prototype: RTCSsrcConflictEvent;
-    new(): RTCSsrcConflictEvent;
-};
-
-interface RTCStatsProvider extends EventTarget {
-    getStats(): Promise<RTCStatsReport>;
-    msGetStats(): Promise<RTCStatsReport>;
-}
-
-declare var RTCStatsProvider: {
-    prototype: RTCStatsProvider;
-    new(): RTCStatsProvider;
-};
-
-interface RandomSource {
-    getRandomValues<T extends Int8Array | Uint8ClampedArray | Uint8Array | Int16Array | Uint16Array | Int32Array | Uint32Array>(array: T): T;
-}
-
-declare var RandomSource: {
-    prototype: RandomSource;
-    new(): RandomSource;
-};
-
-interface Range {
-    readonly collapsed: boolean;
-    readonly commonAncestorContainer: Node;
-    readonly endContainer: Node;
-    readonly endOffset: number;
-    readonly startContainer: Node;
-    readonly startOffset: number;
-    cloneContents(): DocumentFragment;
-    cloneRange(): Range;
-    collapse(toStart?: boolean): void;
-    compareBoundaryPoints(how: number, sourceRange: Range): number;
-    createContextualFragment(fragment: string): DocumentFragment;
-    deleteContents(): void;
-    detach(): void;
-    expand(Unit: ExpandGranularity): boolean;
-    extractContents(): DocumentFragment;
-    getBoundingClientRect(): ClientRect | DOMRect;
-    getClientRects(): ClientRectList | DOMRectList;
-    insertNode(node: Node): void;
-    isPointInRange(node: Node, offset: number): boolean;
-    selectNode(node: Node): void;
-    selectNodeContents(node: Node): void;
-    setEnd(node: Node, offset: number): void;
-    setEndAfter(node: Node): void;
-    setEndBefore(node: Node): void;
-    setStart(node: Node, offset: number): void;
-    setStartAfter(node: Node): void;
-    setStartBefore(node: Node): void;
-    surroundContents(newParent: Node): void;
-    toString(): string;
-    readonly END_TO_END: number;
-    readonly END_TO_START: number;
-    readonly START_TO_END: number;
-    readonly START_TO_START: number;
-}
-
-declare var Range: {
-    prototype: Range;
-    new(): Range;
-    readonly END_TO_END: number;
-    readonly END_TO_START: number;
-    readonly START_TO_END: number;
-    readonly START_TO_START: number;
-};
-
-interface ReadableStream {
-    readonly locked: boolean;
-    cancel(): Promise<void>;
-    getReader(): ReadableStreamReader;
-}
-
-declare var ReadableStream: {
-    prototype: ReadableStream;
-    new(): ReadableStream;
-};
-
-interface ReadableStreamReader {
-    cancel(): Promise<void>;
-    read(): Promise<any>;
-    releaseLock(): void;
-}
-
-declare var ReadableStreamReader: {
-    prototype: ReadableStreamReader;
-    new(): ReadableStreamReader;
-};
-
-interface Request extends Body {
-    readonly cache: RequestCache;
-    readonly credentials: RequestCredentials;
-    readonly destination: RequestDestination;
-    readonly headers: Headers;
-    readonly integrity: string;
-    readonly keepalive: boolean;
-    readonly method: string;
-    readonly mode: RequestMode;
-    readonly redirect: RequestRedirect;
-    readonly referrer: string;
-    readonly referrerPolicy: ReferrerPolicy;
-    readonly signal: AbortSignal | null;
-    readonly type: RequestType;
-    readonly url: string;
-    clone(): Request;
-}
-
-declare var Request: {
-    prototype: Request;
-    new(input: Request | string, init?: RequestInit): Request;
-};
-
-interface Response extends Body {
-    readonly body: ReadableStream | null;
-    readonly headers: Headers;
-    readonly ok: boolean;
-    readonly redirected: boolean;
-    readonly status: number;
-    readonly statusText: string;
-    readonly type: ResponseType;
-    readonly url: string;
-    clone(): Response;
-}
-
-declare var Response: {
-    prototype: Response;
-    new(body?: Blob | Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | FormData | string | null, init?: ResponseInit): Response;
-    error(): Response;
-    redirect(url: string, status?: number): Response;
-};
-
-interface SVGAElement extends SVGGraphicsElement, SVGURIReference {
-    readonly target: SVGAnimatedString;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGAElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGAElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGAElement: {
-    prototype: SVGAElement;
-    new(): SVGAElement;
-};
-
-interface SVGAngle {
-    readonly unitType: number;
-    value: number;
-    valueAsString: string;
-    valueInSpecifiedUnits: number;
-    convertToSpecifiedUnits(unitType: number): void;
-    newValueSpecifiedUnits(unitType: number, valueInSpecifiedUnits: number): void;
-    readonly SVG_ANGLETYPE_DEG: number;
-    readonly SVG_ANGLETYPE_GRAD: number;
-    readonly SVG_ANGLETYPE_RAD: number;
-    readonly SVG_ANGLETYPE_UNKNOWN: number;
-    readonly SVG_ANGLETYPE_UNSPECIFIED: number;
-}
-
-declare var SVGAngle: {
-    prototype: SVGAngle;
-    new(): SVGAngle;
-    readonly SVG_ANGLETYPE_DEG: number;
-    readonly SVG_ANGLETYPE_GRAD: number;
-    readonly SVG_ANGLETYPE_RAD: number;
-    readonly SVG_ANGLETYPE_UNKNOWN: number;
-    readonly SVG_ANGLETYPE_UNSPECIFIED: number;
-};
-
-interface SVGAnimatedAngle {
-    readonly animVal: SVGAngle;
-    readonly baseVal: SVGAngle;
-}
-
-declare var SVGAnimatedAngle: {
-    prototype: SVGAnimatedAngle;
-    new(): SVGAnimatedAngle;
-};
-
-interface SVGAnimatedBoolean {
-    readonly animVal: boolean;
-    baseVal: boolean;
-}
-
-declare var SVGAnimatedBoolean: {
-    prototype: SVGAnimatedBoolean;
-    new(): SVGAnimatedBoolean;
-};
-
-interface SVGAnimatedEnumeration {
-    readonly animVal: number;
-    baseVal: number;
-}
-
-declare var SVGAnimatedEnumeration: {
-    prototype: SVGAnimatedEnumeration;
-    new(): SVGAnimatedEnumeration;
-};
-
-interface SVGAnimatedInteger {
-    readonly animVal: number;
-    baseVal: number;
-}
-
-declare var SVGAnimatedInteger: {
-    prototype: SVGAnimatedInteger;
-    new(): SVGAnimatedInteger;
-};
-
-interface SVGAnimatedLength {
-    readonly animVal: SVGLength;
-    readonly baseVal: SVGLength;
-}
-
-declare var SVGAnimatedLength: {
-    prototype: SVGAnimatedLength;
-    new(): SVGAnimatedLength;
-};
-
-interface SVGAnimatedLengthList {
-    readonly animVal: SVGLengthList;
-    readonly baseVal: SVGLengthList;
-}
-
-declare var SVGAnimatedLengthList: {
-    prototype: SVGAnimatedLengthList;
-    new(): SVGAnimatedLengthList;
-};
-
-interface SVGAnimatedNumber {
-    readonly animVal: number;
-    baseVal: number;
-}
-
-declare var SVGAnimatedNumber: {
-    prototype: SVGAnimatedNumber;
-    new(): SVGAnimatedNumber;
-};
-
-interface SVGAnimatedNumberList {
-    readonly animVal: SVGNumberList;
-    readonly baseVal: SVGNumberList;
-}
-
-declare var SVGAnimatedNumberList: {
-    prototype: SVGAnimatedNumberList;
-    new(): SVGAnimatedNumberList;
-};
-
-interface SVGAnimatedPoints {
-    readonly animatedPoints: SVGPointList;
-    readonly points: SVGPointList;
-}
-
-interface SVGAnimatedPreserveAspectRatio {
-    readonly animVal: SVGPreserveAspectRatio;
-    readonly baseVal: SVGPreserveAspectRatio;
-}
-
-declare var SVGAnimatedPreserveAspectRatio: {
-    prototype: SVGAnimatedPreserveAspectRatio;
-    new(): SVGAnimatedPreserveAspectRatio;
-};
-
-interface SVGAnimatedRect {
-    readonly animVal: SVGRect;
-    readonly baseVal: SVGRect;
-}
-
-declare var SVGAnimatedRect: {
-    prototype: SVGAnimatedRect;
-    new(): SVGAnimatedRect;
-};
-
-interface SVGAnimatedString {
-    readonly animVal: string;
-    baseVal: string;
-}
-
-declare var SVGAnimatedString: {
-    prototype: SVGAnimatedString;
-    new(): SVGAnimatedString;
-};
-
-interface SVGAnimatedTransformList {
-    readonly animVal: SVGTransformList;
-    readonly baseVal: SVGTransformList;
-}
-
-declare var SVGAnimatedTransformList: {
-    prototype: SVGAnimatedTransformList;
-    new(): SVGAnimatedTransformList;
-};
-
-interface SVGCircleElement extends SVGGraphicsElement {
-    readonly cx: SVGAnimatedLength;
-    readonly cy: SVGAnimatedLength;
-    readonly r: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGCircleElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGCircleElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGCircleElement: {
-    prototype: SVGCircleElement;
-    new(): SVGCircleElement;
-};
-
-interface SVGClipPathElement extends SVGGraphicsElement, SVGUnitTypes {
-    readonly clipPathUnits: SVGAnimatedEnumeration;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGClipPathElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGClipPathElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGClipPathElement: {
-    prototype: SVGClipPathElement;
-    new(): SVGClipPathElement;
-};
-
-interface SVGComponentTransferFunctionElement extends SVGElement {
-    readonly amplitude: SVGAnimatedNumber;
-    readonly exponent: SVGAnimatedNumber;
-    readonly intercept: SVGAnimatedNumber;
-    readonly offset: SVGAnimatedNumber;
-    readonly slope: SVGAnimatedNumber;
-    readonly tableValues: SVGAnimatedNumberList;
-    readonly type: SVGAnimatedEnumeration;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_DISCRETE: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_GAMMA: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_IDENTITY: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_LINEAR: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_TABLE: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGComponentTransferFunctionElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGComponentTransferFunctionElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGComponentTransferFunctionElement: {
-    prototype: SVGComponentTransferFunctionElement;
-    new(): SVGComponentTransferFunctionElement;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_DISCRETE: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_GAMMA: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_IDENTITY: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_LINEAR: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_TABLE: number;
-    readonly SVG_FECOMPONENTTRANSFER_TYPE_UNKNOWN: number;
-};
-
-interface SVGDefsElement extends SVGGraphicsElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGDefsElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGDefsElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGDefsElement: {
-    prototype: SVGDefsElement;
-    new(): SVGDefsElement;
-};
-
-interface SVGDescElement extends SVGElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGDescElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGDescElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGDescElement: {
-    prototype: SVGDescElement;
-    new(): SVGDescElement;
-};
-
-interface SVGElementEventMap extends ElementEventMap {
-    "click": MouseEvent;
-    "dblclick": MouseEvent;
-    "focusin": FocusEvent;
-    "focusout": FocusEvent;
-    "load": Event;
-    "mousedown": MouseEvent;
-    "mousemove": MouseEvent;
-    "mouseout": MouseEvent;
-    "mouseover": MouseEvent;
-    "mouseup": MouseEvent;
-}
-
-interface SVGElement extends Element, ElementCSSInlineStyle {
-    readonly className: any;
-    onclick: ((this: SVGElement, ev: MouseEvent) => any) | null;
-    ondblclick: ((this: SVGElement, ev: MouseEvent) => any) | null;
-    onfocusin: ((this: SVGElement, ev: FocusEvent) => any) | null;
-    onfocusout: ((this: SVGElement, ev: FocusEvent) => any) | null;
-    onload: ((this: SVGElement, ev: Event) => any) | null;
-    onmousedown: ((this: SVGElement, ev: MouseEvent) => any) | null;
-    onmousemove: ((this: SVGElement, ev: MouseEvent) => any) | null;
-    onmouseout: ((this: SVGElement, ev: MouseEvent) => any) | null;
-    onmouseover: ((this: SVGElement, ev: MouseEvent) => any) | null;
-    onmouseup: ((this: SVGElement, ev: MouseEvent) => any) | null;
-    readonly ownerSVGElement: SVGSVGElement | null;
-    readonly viewportElement: SVGElement | null;
-    /** @deprecated */
-    xmlbase: string;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGElement: {
-    prototype: SVGElement;
-    new(): SVGElement;
-};
-
-interface SVGElementInstance extends EventTarget {
-    readonly childNodes: SVGElementInstanceList;
-    readonly correspondingElement: SVGElement;
-    readonly correspondingUseElement: SVGUseElement;
-    readonly firstChild: SVGElementInstance;
-    readonly lastChild: SVGElementInstance;
-    readonly nextSibling: SVGElementInstance;
-    readonly parentNode: SVGElementInstance;
-    readonly previousSibling: SVGElementInstance;
-}
-
-declare var SVGElementInstance: {
-    prototype: SVGElementInstance;
-    new(): SVGElementInstance;
-};
-
-interface SVGElementInstanceList {
-    /** @deprecated */
-    readonly length: number;
-    /** @deprecated */
-    item(index: number): SVGElementInstance;
-}
-
-declare var SVGElementInstanceList: {
-    prototype: SVGElementInstanceList;
-    new(): SVGElementInstanceList;
-};
-
-interface SVGEllipseElement extends SVGGraphicsElement {
-    readonly cx: SVGAnimatedLength;
-    readonly cy: SVGAnimatedLength;
-    readonly rx: SVGAnimatedLength;
-    readonly ry: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGEllipseElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGEllipseElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGEllipseElement: {
-    prototype: SVGEllipseElement;
-    new(): SVGEllipseElement;
-};
-
-interface SVGFEBlendElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    readonly in2: SVGAnimatedString;
-    readonly mode: SVGAnimatedEnumeration;
-    readonly SVG_FEBLEND_MODE_COLOR: number;
-    readonly SVG_FEBLEND_MODE_COLOR_BURN: number;
-    readonly SVG_FEBLEND_MODE_COLOR_DODGE: number;
-    readonly SVG_FEBLEND_MODE_DARKEN: number;
-    readonly SVG_FEBLEND_MODE_DIFFERENCE: number;
-    readonly SVG_FEBLEND_MODE_EXCLUSION: number;
-    readonly SVG_FEBLEND_MODE_HARD_LIGHT: number;
-    readonly SVG_FEBLEND_MODE_HUE: number;
-    readonly SVG_FEBLEND_MODE_LIGHTEN: number;
-    readonly SVG_FEBLEND_MODE_LUMINOSITY: number;
-    readonly SVG_FEBLEND_MODE_MULTIPLY: number;
-    readonly SVG_FEBLEND_MODE_NORMAL: number;
-    readonly SVG_FEBLEND_MODE_OVERLAY: number;
-    readonly SVG_FEBLEND_MODE_SATURATION: number;
-    readonly SVG_FEBLEND_MODE_SCREEN: number;
-    readonly SVG_FEBLEND_MODE_SOFT_LIGHT: number;
-    readonly SVG_FEBLEND_MODE_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEBlendElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEBlendElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEBlendElement: {
-    prototype: SVGFEBlendElement;
-    new(): SVGFEBlendElement;
-    readonly SVG_FEBLEND_MODE_COLOR: number;
-    readonly SVG_FEBLEND_MODE_COLOR_BURN: number;
-    readonly SVG_FEBLEND_MODE_COLOR_DODGE: number;
-    readonly SVG_FEBLEND_MODE_DARKEN: number;
-    readonly SVG_FEBLEND_MODE_DIFFERENCE: number;
-    readonly SVG_FEBLEND_MODE_EXCLUSION: number;
-    readonly SVG_FEBLEND_MODE_HARD_LIGHT: number;
-    readonly SVG_FEBLEND_MODE_HUE: number;
-    readonly SVG_FEBLEND_MODE_LIGHTEN: number;
-    readonly SVG_FEBLEND_MODE_LUMINOSITY: number;
-    readonly SVG_FEBLEND_MODE_MULTIPLY: number;
-    readonly SVG_FEBLEND_MODE_NORMAL: number;
-    readonly SVG_FEBLEND_MODE_OVERLAY: number;
-    readonly SVG_FEBLEND_MODE_SATURATION: number;
-    readonly SVG_FEBLEND_MODE_SCREEN: number;
-    readonly SVG_FEBLEND_MODE_SOFT_LIGHT: number;
-    readonly SVG_FEBLEND_MODE_UNKNOWN: number;
-};
-
-interface SVGFEColorMatrixElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    readonly type: SVGAnimatedEnumeration;
-    readonly values: SVGAnimatedNumberList;
-    readonly SVG_FECOLORMATRIX_TYPE_HUEROTATE: number;
-    readonly SVG_FECOLORMATRIX_TYPE_LUMINANCETOALPHA: number;
-    readonly SVG_FECOLORMATRIX_TYPE_MATRIX: number;
-    readonly SVG_FECOLORMATRIX_TYPE_SATURATE: number;
-    readonly SVG_FECOLORMATRIX_TYPE_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEColorMatrixElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEColorMatrixElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEColorMatrixElement: {
-    prototype: SVGFEColorMatrixElement;
-    new(): SVGFEColorMatrixElement;
-    readonly SVG_FECOLORMATRIX_TYPE_HUEROTATE: number;
-    readonly SVG_FECOLORMATRIX_TYPE_LUMINANCETOALPHA: number;
-    readonly SVG_FECOLORMATRIX_TYPE_MATRIX: number;
-    readonly SVG_FECOLORMATRIX_TYPE_SATURATE: number;
-    readonly SVG_FECOLORMATRIX_TYPE_UNKNOWN: number;
-};
-
-interface SVGFEComponentTransferElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEComponentTransferElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEComponentTransferElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEComponentTransferElement: {
-    prototype: SVGFEComponentTransferElement;
-    new(): SVGFEComponentTransferElement;
-};
-
-interface SVGFECompositeElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    readonly in2: SVGAnimatedString;
-    readonly k1: SVGAnimatedNumber;
-    readonly k2: SVGAnimatedNumber;
-    readonly k3: SVGAnimatedNumber;
-    readonly k4: SVGAnimatedNumber;
-    readonly operator: SVGAnimatedEnumeration;
-    readonly SVG_FECOMPOSITE_OPERATOR_ARITHMETIC: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_ATOP: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_IN: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_OUT: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_OVER: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_UNKNOWN: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_XOR: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFECompositeElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFECompositeElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFECompositeElement: {
-    prototype: SVGFECompositeElement;
-    new(): SVGFECompositeElement;
-    readonly SVG_FECOMPOSITE_OPERATOR_ARITHMETIC: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_ATOP: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_IN: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_OUT: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_OVER: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_UNKNOWN: number;
-    readonly SVG_FECOMPOSITE_OPERATOR_XOR: number;
-};
-
-interface SVGFEConvolveMatrixElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly bias: SVGAnimatedNumber;
-    readonly divisor: SVGAnimatedNumber;
-    readonly edgeMode: SVGAnimatedEnumeration;
-    readonly in1: SVGAnimatedString;
-    readonly kernelMatrix: SVGAnimatedNumberList;
-    readonly kernelUnitLengthX: SVGAnimatedNumber;
-    readonly kernelUnitLengthY: SVGAnimatedNumber;
-    readonly orderX: SVGAnimatedInteger;
-    readonly orderY: SVGAnimatedInteger;
-    readonly preserveAlpha: SVGAnimatedBoolean;
-    readonly targetX: SVGAnimatedInteger;
-    readonly targetY: SVGAnimatedInteger;
-    readonly SVG_EDGEMODE_DUPLICATE: number;
-    readonly SVG_EDGEMODE_NONE: number;
-    readonly SVG_EDGEMODE_UNKNOWN: number;
-    readonly SVG_EDGEMODE_WRAP: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEConvolveMatrixElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEConvolveMatrixElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEConvolveMatrixElement: {
-    prototype: SVGFEConvolveMatrixElement;
-    new(): SVGFEConvolveMatrixElement;
-    readonly SVG_EDGEMODE_DUPLICATE: number;
-    readonly SVG_EDGEMODE_NONE: number;
-    readonly SVG_EDGEMODE_UNKNOWN: number;
-    readonly SVG_EDGEMODE_WRAP: number;
-};
-
-interface SVGFEDiffuseLightingElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly diffuseConstant: SVGAnimatedNumber;
-    readonly in1: SVGAnimatedString;
-    readonly kernelUnitLengthX: SVGAnimatedNumber;
-    readonly kernelUnitLengthY: SVGAnimatedNumber;
-    readonly surfaceScale: SVGAnimatedNumber;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEDiffuseLightingElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEDiffuseLightingElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEDiffuseLightingElement: {
-    prototype: SVGFEDiffuseLightingElement;
-    new(): SVGFEDiffuseLightingElement;
-};
-
-interface SVGFEDisplacementMapElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    readonly in2: SVGAnimatedString;
-    readonly scale: SVGAnimatedNumber;
-    readonly xChannelSelector: SVGAnimatedEnumeration;
-    readonly yChannelSelector: SVGAnimatedEnumeration;
-    readonly SVG_CHANNEL_A: number;
-    readonly SVG_CHANNEL_B: number;
-    readonly SVG_CHANNEL_G: number;
-    readonly SVG_CHANNEL_R: number;
-    readonly SVG_CHANNEL_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEDisplacementMapElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEDisplacementMapElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEDisplacementMapElement: {
-    prototype: SVGFEDisplacementMapElement;
-    new(): SVGFEDisplacementMapElement;
-    readonly SVG_CHANNEL_A: number;
-    readonly SVG_CHANNEL_B: number;
-    readonly SVG_CHANNEL_G: number;
-    readonly SVG_CHANNEL_R: number;
-    readonly SVG_CHANNEL_UNKNOWN: number;
-};
-
-interface SVGFEDistantLightElement extends SVGElement {
-    readonly azimuth: SVGAnimatedNumber;
-    readonly elevation: SVGAnimatedNumber;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEDistantLightElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEDistantLightElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEDistantLightElement: {
-    prototype: SVGFEDistantLightElement;
-    new(): SVGFEDistantLightElement;
-};
-
-interface SVGFEFloodElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFloodElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFloodElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEFloodElement: {
-    prototype: SVGFEFloodElement;
-    new(): SVGFEFloodElement;
-};
-
-interface SVGFEFuncAElement extends SVGComponentTransferFunctionElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFuncAElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFuncAElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEFuncAElement: {
-    prototype: SVGFEFuncAElement;
-    new(): SVGFEFuncAElement;
-};
-
-interface SVGFEFuncBElement extends SVGComponentTransferFunctionElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFuncBElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFuncBElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEFuncBElement: {
-    prototype: SVGFEFuncBElement;
-    new(): SVGFEFuncBElement;
-};
-
-interface SVGFEFuncGElement extends SVGComponentTransferFunctionElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFuncGElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFuncGElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEFuncGElement: {
-    prototype: SVGFEFuncGElement;
-    new(): SVGFEFuncGElement;
-};
-
-interface SVGFEFuncRElement extends SVGComponentTransferFunctionElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFuncRElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEFuncRElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEFuncRElement: {
-    prototype: SVGFEFuncRElement;
-    new(): SVGFEFuncRElement;
-};
-
-interface SVGFEGaussianBlurElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    readonly stdDeviationX: SVGAnimatedNumber;
-    readonly stdDeviationY: SVGAnimatedNumber;
-    setStdDeviation(stdDeviationX: number, stdDeviationY: number): void;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEGaussianBlurElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEGaussianBlurElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEGaussianBlurElement: {
-    prototype: SVGFEGaussianBlurElement;
-    new(): SVGFEGaussianBlurElement;
-};
-
-interface SVGFEImageElement extends SVGElement, SVGFilterPrimitiveStandardAttributes, SVGURIReference {
-    readonly preserveAspectRatio: SVGAnimatedPreserveAspectRatio;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEImageElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEImageElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEImageElement: {
-    prototype: SVGFEImageElement;
-    new(): SVGFEImageElement;
-};
-
-interface SVGFEMergeElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEMergeElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEMergeElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEMergeElement: {
-    prototype: SVGFEMergeElement;
-    new(): SVGFEMergeElement;
-};
-
-interface SVGFEMergeNodeElement extends SVGElement {
-    readonly in1: SVGAnimatedString;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEMergeNodeElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEMergeNodeElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEMergeNodeElement: {
-    prototype: SVGFEMergeNodeElement;
-    new(): SVGFEMergeNodeElement;
-};
-
-interface SVGFEMorphologyElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    readonly operator: SVGAnimatedEnumeration;
-    readonly radiusX: SVGAnimatedNumber;
-    readonly radiusY: SVGAnimatedNumber;
-    readonly SVG_MORPHOLOGY_OPERATOR_DILATE: number;
-    readonly SVG_MORPHOLOGY_OPERATOR_ERODE: number;
-    readonly SVG_MORPHOLOGY_OPERATOR_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEMorphologyElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEMorphologyElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEMorphologyElement: {
-    prototype: SVGFEMorphologyElement;
-    new(): SVGFEMorphologyElement;
-    readonly SVG_MORPHOLOGY_OPERATOR_DILATE: number;
-    readonly SVG_MORPHOLOGY_OPERATOR_ERODE: number;
-    readonly SVG_MORPHOLOGY_OPERATOR_UNKNOWN: number;
-};
-
-interface SVGFEOffsetElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly dx: SVGAnimatedNumber;
-    readonly dy: SVGAnimatedNumber;
-    readonly in1: SVGAnimatedString;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEOffsetElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEOffsetElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEOffsetElement: {
-    prototype: SVGFEOffsetElement;
-    new(): SVGFEOffsetElement;
-};
-
-interface SVGFEPointLightElement extends SVGElement {
-    readonly x: SVGAnimatedNumber;
-    readonly y: SVGAnimatedNumber;
-    readonly z: SVGAnimatedNumber;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEPointLightElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFEPointLightElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFEPointLightElement: {
-    prototype: SVGFEPointLightElement;
-    new(): SVGFEPointLightElement;
-};
-
-interface SVGFESpecularLightingElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    readonly kernelUnitLengthX: SVGAnimatedNumber;
-    readonly kernelUnitLengthY: SVGAnimatedNumber;
-    readonly specularConstant: SVGAnimatedNumber;
-    readonly specularExponent: SVGAnimatedNumber;
-    readonly surfaceScale: SVGAnimatedNumber;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFESpecularLightingElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFESpecularLightingElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFESpecularLightingElement: {
-    prototype: SVGFESpecularLightingElement;
-    new(): SVGFESpecularLightingElement;
-};
-
-interface SVGFESpotLightElement extends SVGElement {
-    readonly limitingConeAngle: SVGAnimatedNumber;
-    readonly pointsAtX: SVGAnimatedNumber;
-    readonly pointsAtY: SVGAnimatedNumber;
-    readonly pointsAtZ: SVGAnimatedNumber;
-    readonly specularExponent: SVGAnimatedNumber;
-    readonly x: SVGAnimatedNumber;
-    readonly y: SVGAnimatedNumber;
-    readonly z: SVGAnimatedNumber;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFESpotLightElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFESpotLightElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFESpotLightElement: {
-    prototype: SVGFESpotLightElement;
-    new(): SVGFESpotLightElement;
-};
-
-interface SVGFETileElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly in1: SVGAnimatedString;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFETileElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFETileElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFETileElement: {
-    prototype: SVGFETileElement;
-    new(): SVGFETileElement;
-};
-
-interface SVGFETurbulenceElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-    readonly baseFrequencyX: SVGAnimatedNumber;
-    readonly baseFrequencyY: SVGAnimatedNumber;
-    readonly numOctaves: SVGAnimatedInteger;
-    readonly seed: SVGAnimatedNumber;
-    readonly stitchTiles: SVGAnimatedEnumeration;
-    readonly type: SVGAnimatedEnumeration;
-    readonly SVG_STITCHTYPE_NOSTITCH: number;
-    readonly SVG_STITCHTYPE_STITCH: number;
-    readonly SVG_STITCHTYPE_UNKNOWN: number;
-    readonly SVG_TURBULENCE_TYPE_FRACTALNOISE: number;
-    readonly SVG_TURBULENCE_TYPE_TURBULENCE: number;
-    readonly SVG_TURBULENCE_TYPE_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFETurbulenceElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFETurbulenceElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFETurbulenceElement: {
-    prototype: SVGFETurbulenceElement;
-    new(): SVGFETurbulenceElement;
-    readonly SVG_STITCHTYPE_NOSTITCH: number;
-    readonly SVG_STITCHTYPE_STITCH: number;
-    readonly SVG_STITCHTYPE_UNKNOWN: number;
-    readonly SVG_TURBULENCE_TYPE_FRACTALNOISE: number;
-    readonly SVG_TURBULENCE_TYPE_TURBULENCE: number;
-    readonly SVG_TURBULENCE_TYPE_UNKNOWN: number;
-};
-
-interface SVGFilterElement extends SVGElement, SVGUnitTypes, SVGURIReference {
-    /** @deprecated */
-    readonly filterResX: SVGAnimatedInteger;
-    /** @deprecated */
-    readonly filterResY: SVGAnimatedInteger;
-    readonly filterUnits: SVGAnimatedEnumeration;
-    readonly height: SVGAnimatedLength;
-    readonly primitiveUnits: SVGAnimatedEnumeration;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-    /** @deprecated */
-    setFilterRes(filterResX: number, filterResY: number): void;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFilterElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGFilterElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGFilterElement: {
-    prototype: SVGFilterElement;
-    new(): SVGFilterElement;
-};
-
-interface SVGFilterPrimitiveStandardAttributes {
-    readonly height: SVGAnimatedLength;
-    readonly result: SVGAnimatedString;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-}
-
-interface SVGFitToViewBox {
-    readonly preserveAspectRatio: SVGAnimatedPreserveAspectRatio;
-    readonly viewBox: SVGAnimatedRect;
-}
-
-interface SVGForeignObjectElement extends SVGGraphicsElement {
-    readonly height: SVGAnimatedLength;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGForeignObjectElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGForeignObjectElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGForeignObjectElement: {
-    prototype: SVGForeignObjectElement;
-    new(): SVGForeignObjectElement;
-};
-
-interface SVGGElement extends SVGGraphicsElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGGElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGGElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGGElement: {
-    prototype: SVGGElement;
-    new(): SVGGElement;
-};
-
-interface SVGGradientElement extends SVGElement, SVGUnitTypes, SVGURIReference {
-    readonly gradientTransform: SVGAnimatedTransformList;
-    readonly gradientUnits: SVGAnimatedEnumeration;
-    readonly spreadMethod: SVGAnimatedEnumeration;
-    readonly SVG_SPREADMETHOD_PAD: number;
-    readonly SVG_SPREADMETHOD_REFLECT: number;
-    readonly SVG_SPREADMETHOD_REPEAT: number;
-    readonly SVG_SPREADMETHOD_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGGradientElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGGradientElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGGradientElement: {
-    prototype: SVGGradientElement;
-    new(): SVGGradientElement;
-    readonly SVG_SPREADMETHOD_PAD: number;
-    readonly SVG_SPREADMETHOD_REFLECT: number;
-    readonly SVG_SPREADMETHOD_REPEAT: number;
-    readonly SVG_SPREADMETHOD_UNKNOWN: number;
-};
-
-interface SVGGraphicsElement extends SVGElement, SVGTests {
-    /** @deprecated */
-    readonly farthestViewportElement: SVGElement | null;
-    /** @deprecated */
-    readonly nearestViewportElement: SVGElement | null;
-    readonly transform: SVGAnimatedTransformList;
-    getBBox(): SVGRect;
-    getCTM(): SVGMatrix | null;
-    getScreenCTM(): SVGMatrix | null;
-    /** @deprecated */
-    getTransformToElement(element: SVGElement): SVGMatrix;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGGraphicsElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGGraphicsElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGGraphicsElement: {
-    prototype: SVGGraphicsElement;
-    new(): SVGGraphicsElement;
-};
-
-interface SVGImageElement extends SVGGraphicsElement, SVGURIReference {
-    readonly height: SVGAnimatedLength;
-    readonly preserveAspectRatio: SVGAnimatedPreserveAspectRatio;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGImageElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGImageElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGImageElement: {
-    prototype: SVGImageElement;
-    new(): SVGImageElement;
-};
-
-interface SVGLength {
-    readonly unitType: number;
-    value: number;
-    valueAsString: string;
-    valueInSpecifiedUnits: number;
-    convertToSpecifiedUnits(unitType: number): void;
-    newValueSpecifiedUnits(unitType: number, valueInSpecifiedUnits: number): void;
-    readonly SVG_LENGTHTYPE_CM: number;
-    readonly SVG_LENGTHTYPE_EMS: number;
-    readonly SVG_LENGTHTYPE_EXS: number;
-    readonly SVG_LENGTHTYPE_IN: number;
-    readonly SVG_LENGTHTYPE_MM: number;
-    readonly SVG_LENGTHTYPE_NUMBER: number;
-    readonly SVG_LENGTHTYPE_PC: number;
-    readonly SVG_LENGTHTYPE_PERCENTAGE: number;
-    readonly SVG_LENGTHTYPE_PT: number;
-    readonly SVG_LENGTHTYPE_PX: number;
-    readonly SVG_LENGTHTYPE_UNKNOWN: number;
-}
-
-declare var SVGLength: {
-    prototype: SVGLength;
-    new(): SVGLength;
-    readonly SVG_LENGTHTYPE_CM: number;
-    readonly SVG_LENGTHTYPE_EMS: number;
-    readonly SVG_LENGTHTYPE_EXS: number;
-    readonly SVG_LENGTHTYPE_IN: number;
-    readonly SVG_LENGTHTYPE_MM: number;
-    readonly SVG_LENGTHTYPE_NUMBER: number;
-    readonly SVG_LENGTHTYPE_PC: number;
-    readonly SVG_LENGTHTYPE_PERCENTAGE: number;
-    readonly SVG_LENGTHTYPE_PT: number;
-    readonly SVG_LENGTHTYPE_PX: number;
-    readonly SVG_LENGTHTYPE_UNKNOWN: number;
-};
-
-interface SVGLengthList {
-    readonly numberOfItems: number;
-    appendItem(newItem: SVGLength): SVGLength;
-    clear(): void;
-    getItem(index: number): SVGLength;
-    initialize(newItem: SVGLength): SVGLength;
-    insertItemBefore(newItem: SVGLength, index: number): SVGLength;
-    removeItem(index: number): SVGLength;
-    replaceItem(newItem: SVGLength, index: number): SVGLength;
-}
-
-declare var SVGLengthList: {
-    prototype: SVGLengthList;
-    new(): SVGLengthList;
-};
-
-interface SVGLineElement extends SVGGraphicsElement {
-    readonly x1: SVGAnimatedLength;
-    readonly x2: SVGAnimatedLength;
-    readonly y1: SVGAnimatedLength;
-    readonly y2: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGLineElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGLineElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGLineElement: {
-    prototype: SVGLineElement;
-    new(): SVGLineElement;
-};
-
-interface SVGLinearGradientElement extends SVGGradientElement {
-    readonly x1: SVGAnimatedLength;
-    readonly x2: SVGAnimatedLength;
-    readonly y1: SVGAnimatedLength;
-    readonly y2: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGLinearGradientElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGLinearGradientElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGLinearGradientElement: {
-    prototype: SVGLinearGradientElement;
-    new(): SVGLinearGradientElement;
-};
-
-interface SVGMarkerElement extends SVGElement, SVGFitToViewBox {
-    readonly markerHeight: SVGAnimatedLength;
-    readonly markerUnits: SVGAnimatedEnumeration;
-    readonly markerWidth: SVGAnimatedLength;
-    readonly orientAngle: SVGAnimatedAngle;
-    readonly orientType: SVGAnimatedEnumeration;
-    readonly refX: SVGAnimatedLength;
-    readonly refY: SVGAnimatedLength;
-    setOrientToAngle(angle: SVGAngle): void;
-    setOrientToAuto(): void;
-    readonly SVG_MARKERUNITS_STROKEWIDTH: number;
-    readonly SVG_MARKERUNITS_UNKNOWN: number;
-    readonly SVG_MARKERUNITS_USERSPACEONUSE: number;
-    readonly SVG_MARKER_ORIENT_ANGLE: number;
-    readonly SVG_MARKER_ORIENT_AUTO: number;
-    readonly SVG_MARKER_ORIENT_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGMarkerElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGMarkerElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGMarkerElement: {
-    prototype: SVGMarkerElement;
-    new(): SVGMarkerElement;
-    readonly SVG_MARKERUNITS_STROKEWIDTH: number;
-    readonly SVG_MARKERUNITS_UNKNOWN: number;
-    readonly SVG_MARKERUNITS_USERSPACEONUSE: number;
-    readonly SVG_MARKER_ORIENT_ANGLE: number;
-    readonly SVG_MARKER_ORIENT_AUTO: number;
-    readonly SVG_MARKER_ORIENT_UNKNOWN: number;
-};
-
-interface SVGMaskElement extends SVGElement, SVGTests, SVGUnitTypes {
-    readonly height: SVGAnimatedLength;
-    readonly maskContentUnits: SVGAnimatedEnumeration;
-    readonly maskUnits: SVGAnimatedEnumeration;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGMaskElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGMaskElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGMaskElement: {
-    prototype: SVGMaskElement;
-    new(): SVGMaskElement;
-};
-
-interface SVGMatrix {
-    a: number;
-    b: number;
-    c: number;
-    d: number;
-    e: number;
-    f: number;
-    flipX(): SVGMatrix;
-    flipY(): SVGMatrix;
-    inverse(): SVGMatrix;
-    multiply(secondMatrix: SVGMatrix): SVGMatrix;
-    rotate(angle: number): SVGMatrix;
-    rotateFromVector(x: number, y: number): SVGMatrix;
-    scale(scaleFactor: number): SVGMatrix;
-    scaleNonUniform(scaleFactorX: number, scaleFactorY: number): SVGMatrix;
-    skewX(angle: number): SVGMatrix;
-    skewY(angle: number): SVGMatrix;
-    translate(x: number, y: number): SVGMatrix;
-}
-
-declare var SVGMatrix: {
-    prototype: SVGMatrix;
-    new(): SVGMatrix;
-};
-
-interface SVGMetadataElement extends SVGElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGMetadataElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGMetadataElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGMetadataElement: {
-    prototype: SVGMetadataElement;
-    new(): SVGMetadataElement;
-};
-
-interface SVGNumber {
-    value: number;
-}
-
-declare var SVGNumber: {
-    prototype: SVGNumber;
-    new(): SVGNumber;
-};
-
-interface SVGNumberList {
-    readonly numberOfItems: number;
-    appendItem(newItem: SVGNumber): SVGNumber;
-    clear(): void;
-    getItem(index: number): SVGNumber;
-    initialize(newItem: SVGNumber): SVGNumber;
-    insertItemBefore(newItem: SVGNumber, index: number): SVGNumber;
-    removeItem(index: number): SVGNumber;
-    replaceItem(newItem: SVGNumber, index: number): SVGNumber;
-}
-
-declare var SVGNumberList: {
-    prototype: SVGNumberList;
-    new(): SVGNumberList;
-};
-
-interface SVGPathElement extends SVGGraphicsElement {
-    /** @deprecated */
-    readonly pathSegList: SVGPathSegList;
-    /** @deprecated */
-    createSVGPathSegArcAbs(x: number, y: number, r1: number, r2: number, angle: number, largeArcFlag: boolean, sweepFlag: boolean): SVGPathSegArcAbs;
-    /** @deprecated */
-    createSVGPathSegArcRel(x: number, y: number, r1: number, r2: number, angle: number, largeArcFlag: boolean, sweepFlag: boolean): SVGPathSegArcRel;
-    /** @deprecated */
-    createSVGPathSegClosePath(): SVGPathSegClosePath;
-    /** @deprecated */
-    createSVGPathSegCurvetoCubicAbs(x: number, y: number, x1: number, y1: number, x2: number, y2: number): SVGPathSegCurvetoCubicAbs;
-    /** @deprecated */
-    createSVGPathSegCurvetoCubicRel(x: number, y: number, x1: number, y1: number, x2: number, y2: number): SVGPathSegCurvetoCubicRel;
-    /** @deprecated */
-    createSVGPathSegCurvetoCubicSmoothAbs(x: number, y: number, x2: number, y2: number): SVGPathSegCurvetoCubicSmoothAbs;
-    /** @deprecated */
-    createSVGPathSegCurvetoCubicSmoothRel(x: number, y: number, x2: number, y2: number): SVGPathSegCurvetoCubicSmoothRel;
-    /** @deprecated */
-    createSVGPathSegCurvetoQuadraticAbs(x: number, y: number, x1: number, y1: number): SVGPathSegCurvetoQuadraticAbs;
-    /** @deprecated */
-    createSVGPathSegCurvetoQuadraticRel(x: number, y: number, x1: number, y1: number): SVGPathSegCurvetoQuadraticRel;
-    /** @deprecated */
-    createSVGPathSegCurvetoQuadraticSmoothAbs(x: number, y: number): SVGPathSegCurvetoQuadraticSmoothAbs;
-    /** @deprecated */
-    createSVGPathSegCurvetoQuadraticSmoothRel(x: number, y: number): SVGPathSegCurvetoQuadraticSmoothRel;
-    /** @deprecated */
-    createSVGPathSegLinetoAbs(x: number, y: number): SVGPathSegLinetoAbs;
-    /** @deprecated */
-    createSVGPathSegLinetoHorizontalAbs(x: number): SVGPathSegLinetoHorizontalAbs;
-    /** @deprecated */
-    createSVGPathSegLinetoHorizontalRel(x: number): SVGPathSegLinetoHorizontalRel;
-    /** @deprecated */
-    createSVGPathSegLinetoRel(x: number, y: number): SVGPathSegLinetoRel;
-    /** @deprecated */
-    createSVGPathSegLinetoVerticalAbs(y: number): SVGPathSegLinetoVerticalAbs;
-    /** @deprecated */
-    createSVGPathSegLinetoVerticalRel(y: number): SVGPathSegLinetoVerticalRel;
-    /** @deprecated */
-    createSVGPathSegMovetoAbs(x: number, y: number): SVGPathSegMovetoAbs;
-    /** @deprecated */
-    createSVGPathSegMovetoRel(x: number, y: number): SVGPathSegMovetoRel;
-    /** @deprecated */
-    getPathSegAtLength(distance: number): number;
-    getPointAtLength(distance: number): SVGPoint;
-    getTotalLength(): number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGPathElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGPathElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGPathElement: {
-    prototype: SVGPathElement;
-    new(): SVGPathElement;
-};
-
-interface SVGPathSeg {
-    readonly pathSegType: number;
-    readonly pathSegTypeAsLetter: string;
-    readonly PATHSEG_ARC_ABS: number;
-    readonly PATHSEG_ARC_REL: number;
-    readonly PATHSEG_CLOSEPATH: number;
-    readonly PATHSEG_CURVETO_CUBIC_ABS: number;
-    readonly PATHSEG_CURVETO_CUBIC_REL: number;
-    readonly PATHSEG_CURVETO_CUBIC_SMOOTH_ABS: number;
-    readonly PATHSEG_CURVETO_CUBIC_SMOOTH_REL: number;
-    readonly PATHSEG_CURVETO_QUADRATIC_ABS: number;
-    readonly PATHSEG_CURVETO_QUADRATIC_REL: number;
-    readonly PATHSEG_CURVETO_QUADRATIC_SMOOTH_ABS: number;
-    readonly PATHSEG_CURVETO_QUADRATIC_SMOOTH_REL: number;
-    readonly PATHSEG_LINETO_ABS: number;
-    readonly PATHSEG_LINETO_HORIZONTAL_ABS: number;
-    readonly PATHSEG_LINETO_HORIZONTAL_REL: number;
-    readonly PATHSEG_LINETO_REL: number;
-    readonly PATHSEG_LINETO_VERTICAL_ABS: number;
-    readonly PATHSEG_LINETO_VERTICAL_REL: number;
-    readonly PATHSEG_MOVETO_ABS: number;
-    readonly PATHSEG_MOVETO_REL: number;
-    readonly PATHSEG_UNKNOWN: number;
-}
-
-declare var SVGPathSeg: {
-    prototype: SVGPathSeg;
-    new(): SVGPathSeg;
-    readonly PATHSEG_ARC_ABS: number;
-    readonly PATHSEG_ARC_REL: number;
-    readonly PATHSEG_CLOSEPATH: number;
-    readonly PATHSEG_CURVETO_CUBIC_ABS: number;
-    readonly PATHSEG_CURVETO_CUBIC_REL: number;
-    readonly PATHSEG_CURVETO_CUBIC_SMOOTH_ABS: number;
-    readonly PATHSEG_CURVETO_CUBIC_SMOOTH_REL: number;
-    readonly PATHSEG_CURVETO_QUADRATIC_ABS: number;
-    readonly PATHSEG_CURVETO_QUADRATIC_REL: number;
-    readonly PATHSEG_CURVETO_QUADRATIC_SMOOTH_ABS: number;
-    readonly PATHSEG_CURVETO_QUADRATIC_SMOOTH_REL: number;
-    readonly PATHSEG_LINETO_ABS: number;
-    readonly PATHSEG_LINETO_HORIZONTAL_ABS: number;
-    readonly PATHSEG_LINETO_HORIZONTAL_REL: number;
-    readonly PATHSEG_LINETO_REL: number;
-    readonly PATHSEG_LINETO_VERTICAL_ABS: number;
-    readonly PATHSEG_LINETO_VERTICAL_REL: number;
-    readonly PATHSEG_MOVETO_ABS: number;
-    readonly PATHSEG_MOVETO_REL: number;
-    readonly PATHSEG_UNKNOWN: number;
-};
-
-interface SVGPathSegArcAbs extends SVGPathSeg {
-    angle: number;
-    largeArcFlag: boolean;
-    r1: number;
-    r2: number;
-    sweepFlag: boolean;
-    x: number;
-    y: number;
-}
-
-declare var SVGPathSegArcAbs: {
-    prototype: SVGPathSegArcAbs;
-    new(): SVGPathSegArcAbs;
-};
-
-interface SVGPathSegArcRel extends SVGPathSeg {
-    angle: number;
-    largeArcFlag: boolean;
-    r1: number;
-    r2: number;
-    sweepFlag: boolean;
-    x: number;
-    y: number;
-}
-
-declare var SVGPathSegArcRel: {
-    prototype: SVGPathSegArcRel;
-    new(): SVGPathSegArcRel;
-};
-
-interface SVGPathSegClosePath extends SVGPathSeg {
-}
-
-declare var SVGPathSegClosePath: {
-    prototype: SVGPathSegClosePath;
-    new(): SVGPathSegClosePath;
-};
-
-interface SVGPathSegCurvetoCubicAbs extends SVGPathSeg {
-    x: number;
-    x1: number;
-    x2: number;
-    y: number;
-    y1: number;
-    y2: number;
-}
-
-declare var SVGPathSegCurvetoCubicAbs: {
-    prototype: SVGPathSegCurvetoCubicAbs;
-    new(): SVGPathSegCurvetoCubicAbs;
-};
-
-interface SVGPathSegCurvetoCubicRel extends SVGPathSeg {
-    x: number;
-    x1: number;
-    x2: number;
-    y: number;
-    y1: number;
-    y2: number;
-}
-
-declare var SVGPathSegCurvetoCubicRel: {
-    prototype: SVGPathSegCurvetoCubicRel;
-    new(): SVGPathSegCurvetoCubicRel;
-};
-
-interface SVGPathSegCurvetoCubicSmoothAbs extends SVGPathSeg {
-    x: number;
-    x2: number;
-    y: number;
-    y2: number;
-}
-
-declare var SVGPathSegCurvetoCubicSmoothAbs: {
-    prototype: SVGPathSegCurvetoCubicSmoothAbs;
-    new(): SVGPathSegCurvetoCubicSmoothAbs;
-};
-
-interface SVGPathSegCurvetoCubicSmoothRel extends SVGPathSeg {
-    x: number;
-    x2: number;
-    y: number;
-    y2: number;
-}
-
-declare var SVGPathSegCurvetoCubicSmoothRel: {
-    prototype: SVGPathSegCurvetoCubicSmoothRel;
-    new(): SVGPathSegCurvetoCubicSmoothRel;
-};
-
-interface SVGPathSegCurvetoQuadraticAbs extends SVGPathSeg {
-    x: number;
-    x1: number;
-    y: number;
-    y1: number;
-}
-
-declare var SVGPathSegCurvetoQuadraticAbs: {
-    prototype: SVGPathSegCurvetoQuadraticAbs;
-    new(): SVGPathSegCurvetoQuadraticAbs;
-};
-
-interface SVGPathSegCurvetoQuadraticRel extends SVGPathSeg {
-    x: number;
-    x1: number;
-    y: number;
-    y1: number;
-}
-
-declare var SVGPathSegCurvetoQuadraticRel: {
-    prototype: SVGPathSegCurvetoQuadraticRel;
-    new(): SVGPathSegCurvetoQuadraticRel;
-};
-
-interface SVGPathSegCurvetoQuadraticSmoothAbs extends SVGPathSeg {
-    x: number;
-    y: number;
-}
-
-declare var SVGPathSegCurvetoQuadraticSmoothAbs: {
-    prototype: SVGPathSegCurvetoQuadraticSmoothAbs;
-    new(): SVGPathSegCurvetoQuadraticSmoothAbs;
-};
-
-interface SVGPathSegCurvetoQuadraticSmoothRel extends SVGPathSeg {
-    x: number;
-    y: number;
-}
-
-declare var SVGPathSegCurvetoQuadraticSmoothRel: {
-    prototype: SVGPathSegCurvetoQuadraticSmoothRel;
-    new(): SVGPathSegCurvetoQuadraticSmoothRel;
-};
-
-interface SVGPathSegLinetoAbs extends SVGPathSeg {
-    x: number;
-    y: number;
-}
-
-declare var SVGPathSegLinetoAbs: {
-    prototype: SVGPathSegLinetoAbs;
-    new(): SVGPathSegLinetoAbs;
-};
-
-interface SVGPathSegLinetoHorizontalAbs extends SVGPathSeg {
-    x: number;
-}
-
-declare var SVGPathSegLinetoHorizontalAbs: {
-    prototype: SVGPathSegLinetoHorizontalAbs;
-    new(): SVGPathSegLinetoHorizontalAbs;
-};
-
-interface SVGPathSegLinetoHorizontalRel extends SVGPathSeg {
-    x: number;
-}
-
-declare var SVGPathSegLinetoHorizontalRel: {
-    prototype: SVGPathSegLinetoHorizontalRel;
-    new(): SVGPathSegLinetoHorizontalRel;
-};
-
-interface SVGPathSegLinetoRel extends SVGPathSeg {
-    x: number;
-    y: number;
-}
-
-declare var SVGPathSegLinetoRel: {
-    prototype: SVGPathSegLinetoRel;
-    new(): SVGPathSegLinetoRel;
-};
-
-interface SVGPathSegLinetoVerticalAbs extends SVGPathSeg {
-    y: number;
-}
-
-declare var SVGPathSegLinetoVerticalAbs: {
-    prototype: SVGPathSegLinetoVerticalAbs;
-    new(): SVGPathSegLinetoVerticalAbs;
-};
-
-interface SVGPathSegLinetoVerticalRel extends SVGPathSeg {
-    y: number;
-}
-
-declare var SVGPathSegLinetoVerticalRel: {
-    prototype: SVGPathSegLinetoVerticalRel;
-    new(): SVGPathSegLinetoVerticalRel;
-};
-
-interface SVGPathSegList {
-    readonly numberOfItems: number;
-    appendItem(newItem: SVGPathSeg): SVGPathSeg;
-    clear(): void;
-    getItem(index: number): SVGPathSeg;
-    initialize(newItem: SVGPathSeg): SVGPathSeg;
-    insertItemBefore(newItem: SVGPathSeg, index: number): SVGPathSeg;
-    removeItem(index: number): SVGPathSeg;
-    replaceItem(newItem: SVGPathSeg, index: number): SVGPathSeg;
-}
-
-declare var SVGPathSegList: {
-    prototype: SVGPathSegList;
-    new(): SVGPathSegList;
-};
-
-interface SVGPathSegMovetoAbs extends SVGPathSeg {
-    x: number;
-    y: number;
-}
-
-declare var SVGPathSegMovetoAbs: {
-    prototype: SVGPathSegMovetoAbs;
-    new(): SVGPathSegMovetoAbs;
-};
-
-interface SVGPathSegMovetoRel extends SVGPathSeg {
-    x: number;
-    y: number;
-}
-
-declare var SVGPathSegMovetoRel: {
-    prototype: SVGPathSegMovetoRel;
-    new(): SVGPathSegMovetoRel;
-};
-
-interface SVGPatternElement extends SVGElement, SVGTests, SVGUnitTypes, SVGFitToViewBox, SVGURIReference {
-    readonly height: SVGAnimatedLength;
-    readonly patternContentUnits: SVGAnimatedEnumeration;
-    readonly patternTransform: SVGAnimatedTransformList;
-    readonly patternUnits: SVGAnimatedEnumeration;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGPatternElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGPatternElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGPatternElement: {
-    prototype: SVGPatternElement;
-    new(): SVGPatternElement;
-};
-
-interface SVGPoint {
-    x: number;
-    y: number;
-    matrixTransform(matrix: SVGMatrix): SVGPoint;
-}
-
-declare var SVGPoint: {
-    prototype: SVGPoint;
-    new(): SVGPoint;
-};
-
-interface SVGPointList {
-    readonly numberOfItems: number;
-    appendItem(newItem: SVGPoint): SVGPoint;
-    clear(): void;
-    getItem(index: number): SVGPoint;
-    initialize(newItem: SVGPoint): SVGPoint;
-    insertItemBefore(newItem: SVGPoint, index: number): SVGPoint;
-    removeItem(index: number): SVGPoint;
-    replaceItem(newItem: SVGPoint, index: number): SVGPoint;
-}
-
-declare var SVGPointList: {
-    prototype: SVGPointList;
-    new(): SVGPointList;
-};
-
-interface SVGPolygonElement extends SVGGraphicsElement, SVGAnimatedPoints {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGPolygonElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGPolygonElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGPolygonElement: {
-    prototype: SVGPolygonElement;
-    new(): SVGPolygonElement;
-};
-
-interface SVGPolylineElement extends SVGGraphicsElement, SVGAnimatedPoints {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGPolylineElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGPolylineElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGPolylineElement: {
-    prototype: SVGPolylineElement;
-    new(): SVGPolylineElement;
-};
-
-interface SVGPreserveAspectRatio {
-    align: number;
-    meetOrSlice: number;
-    readonly SVG_MEETORSLICE_MEET: number;
-    readonly SVG_MEETORSLICE_SLICE: number;
-    readonly SVG_MEETORSLICE_UNKNOWN: number;
-    readonly SVG_PRESERVEASPECTRATIO_NONE: number;
-    readonly SVG_PRESERVEASPECTRATIO_UNKNOWN: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMAXYMAX: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMAXYMID: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMAXYMIN: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMIDYMAX: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMIDYMID: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMIDYMIN: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMINYMAX: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMINYMID: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMINYMIN: number;
-}
-
-declare var SVGPreserveAspectRatio: {
-    prototype: SVGPreserveAspectRatio;
-    new(): SVGPreserveAspectRatio;
-    readonly SVG_MEETORSLICE_MEET: number;
-    readonly SVG_MEETORSLICE_SLICE: number;
-    readonly SVG_MEETORSLICE_UNKNOWN: number;
-    readonly SVG_PRESERVEASPECTRATIO_NONE: number;
-    readonly SVG_PRESERVEASPECTRATIO_UNKNOWN: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMAXYMAX: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMAXYMID: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMAXYMIN: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMIDYMAX: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMIDYMID: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMIDYMIN: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMINYMAX: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMINYMID: number;
-    readonly SVG_PRESERVEASPECTRATIO_XMINYMIN: number;
-};
-
-interface SVGRadialGradientElement extends SVGGradientElement {
-    readonly cx: SVGAnimatedLength;
-    readonly cy: SVGAnimatedLength;
-    readonly fx: SVGAnimatedLength;
-    readonly fy: SVGAnimatedLength;
-    readonly r: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGRadialGradientElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGRadialGradientElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGRadialGradientElement: {
-    prototype: SVGRadialGradientElement;
-    new(): SVGRadialGradientElement;
-};
-
-interface SVGRect {
-    height: number;
-    width: number;
-    x: number;
-    y: number;
-}
-
-declare var SVGRect: {
-    prototype: SVGRect;
-    new(): SVGRect;
-};
-
-interface SVGRectElement extends SVGGraphicsElement {
-    readonly height: SVGAnimatedLength;
-    readonly rx: SVGAnimatedLength;
-    readonly ry: SVGAnimatedLength;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGRectElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGRectElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGRectElement: {
-    prototype: SVGRectElement;
-    new(): SVGRectElement;
-};
-
-interface SVGSVGElementEventMap extends SVGElementEventMap {
-    "SVGAbort": Event;
-    "SVGError": Event;
-    "resize": UIEvent;
-    "scroll": UIEvent;
-    "SVGUnload": Event;
-    "SVGZoom": SVGZoomEvent;
-}
-
-interface SVGSVGElement extends SVGGraphicsElement, DocumentEvent, SVGFitToViewBox, SVGZoomAndPan {
-    /** @deprecated */
-    contentScriptType: string;
-    /** @deprecated */
-    contentStyleType: string;
-    currentScale: number;
-    readonly currentTranslate: SVGPoint;
-    readonly height: SVGAnimatedLength;
-    onabort: ((this: SVGSVGElement, ev: Event) => any) | null;
-    onerror: ((this: SVGSVGElement, ev: Event) => any) | null;
-    onresize: ((this: SVGSVGElement, ev: UIEvent) => any) | null;
-    onscroll: ((this: SVGSVGElement, ev: UIEvent) => any) | null;
-    onunload: ((this: SVGSVGElement, ev: Event) => any) | null;
-    onzoom: ((this: SVGSVGElement, ev: SVGZoomEvent) => any) | null;
-    /** @deprecated */
-    readonly pixelUnitToMillimeterX: number;
-    /** @deprecated */
-    readonly pixelUnitToMillimeterY: number;
-    /** @deprecated */
-    readonly screenPixelToMillimeterX: number;
-    /** @deprecated */
-    readonly screenPixelToMillimeterY: number;
-    /** @deprecated */
-    readonly viewport: SVGRect;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-    checkEnclosure(element: SVGElement, rect: SVGRect): boolean;
-    checkIntersection(element: SVGElement, rect: SVGRect): boolean;
-    createSVGAngle(): SVGAngle;
-    createSVGLength(): SVGLength;
-    createSVGMatrix(): SVGMatrix;
-    createSVGNumber(): SVGNumber;
-    createSVGPoint(): SVGPoint;
-    createSVGRect(): SVGRect;
-    createSVGTransform(): SVGTransform;
-    createSVGTransformFromMatrix(matrix: SVGMatrix): SVGTransform;
-    deselectAll(): void;
-    /** @deprecated */
-    forceRedraw(): void;
-    getComputedStyle(elt: Element, pseudoElt?: string | null): CSSStyleDeclaration;
-    /** @deprecated */
-    getCurrentTime(): number;
-    getElementById(elementId: string): Element;
-    getEnclosureList(rect: SVGRect, referenceElement: SVGElement): NodeListOf<SVGCircleElement | SVGEllipseElement | SVGImageElement | SVGLineElement | SVGPathElement | SVGPolygonElement | SVGPolylineElement | SVGRectElement | SVGTextElement | SVGUseElement>;
-    getIntersectionList(rect: SVGRect, referenceElement: SVGElement): NodeListOf<SVGCircleElement | SVGEllipseElement | SVGImageElement | SVGLineElement | SVGPathElement | SVGPolygonElement | SVGPolylineElement | SVGRectElement | SVGTextElement | SVGUseElement>;
-    /** @deprecated */
-    pauseAnimations(): void;
-    /** @deprecated */
-    setCurrentTime(seconds: number): void;
-    /** @deprecated */
-    suspendRedraw(maxWaitMilliseconds: number): number;
-    /** @deprecated */
-    unpauseAnimations(): void;
-    /** @deprecated */
-    unsuspendRedraw(suspendHandleID: number): void;
-    /** @deprecated */
-    unsuspendRedrawAll(): void;
-    addEventListener<K extends keyof SVGSVGElementEventMap>(type: K, listener: (this: SVGSVGElement, ev: SVGSVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGSVGElementEventMap>(type: K, listener: (this: SVGSVGElement, ev: SVGSVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGSVGElement: {
-    prototype: SVGSVGElement;
-    new(): SVGSVGElement;
-};
-
-interface SVGScriptElement extends SVGElement, SVGURIReference {
-    type: string;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGScriptElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGScriptElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGScriptElement: {
-    prototype: SVGScriptElement;
-    new(): SVGScriptElement;
-};
-
-interface SVGStopElement extends SVGElement {
-    readonly offset: SVGAnimatedNumber;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGStopElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGStopElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGStopElement: {
-    prototype: SVGStopElement;
-    new(): SVGStopElement;
-};
-
-interface SVGStringList {
-    readonly numberOfItems: number;
-    appendItem(newItem: string): string;
-    clear(): void;
-    getItem(index: number): string;
-    initialize(newItem: string): string;
-    insertItemBefore(newItem: string, index: number): string;
-    removeItem(index: number): string;
-    replaceItem(newItem: string, index: number): string;
-}
-
-declare var SVGStringList: {
-    prototype: SVGStringList;
-    new(): SVGStringList;
-};
-
-interface SVGStylable {
-    className: any;
-}
-
-declare var SVGStylable: {
-    prototype: SVGStylable;
-    new(): SVGStylable;
-};
-
-interface SVGStyleElement extends SVGElement {
-    disabled: boolean;
-    media: string;
-    title: string;
-    type: string;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGStyleElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGStyleElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGStyleElement: {
-    prototype: SVGStyleElement;
-    new(): SVGStyleElement;
-};
-
-interface SVGSwitchElement extends SVGGraphicsElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGSwitchElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGSwitchElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGSwitchElement: {
-    prototype: SVGSwitchElement;
-    new(): SVGSwitchElement;
-};
-
-interface SVGSymbolElement extends SVGElement, SVGFitToViewBox {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGSymbolElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGSymbolElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGSymbolElement: {
-    prototype: SVGSymbolElement;
-    new(): SVGSymbolElement;
-};
-
-interface SVGTSpanElement extends SVGTextPositioningElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTSpanElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTSpanElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGTSpanElement: {
-    prototype: SVGTSpanElement;
-    new(): SVGTSpanElement;
-};
-
-interface SVGTests {
-    readonly requiredExtensions: SVGStringList;
-    /** @deprecated */
-    readonly requiredFeatures: SVGStringList;
-    readonly systemLanguage: SVGStringList;
-    /** @deprecated */
-    hasExtension(extension: string): boolean;
-}
-
-interface SVGTextContentElement extends SVGGraphicsElement {
-    readonly lengthAdjust: SVGAnimatedEnumeration;
-    readonly textLength: SVGAnimatedLength;
-    getCharNumAtPosition(point: SVGPoint): number;
-    getComputedTextLength(): number;
-    getEndPositionOfChar(charnum: number): SVGPoint;
-    getExtentOfChar(charnum: number): SVGRect;
-    getNumberOfChars(): number;
-    getRotationOfChar(charnum: number): number;
-    getStartPositionOfChar(charnum: number): SVGPoint;
-    getSubStringLength(charnum: number, nchars: number): number;
-    selectSubString(charnum: number, nchars: number): void;
-    readonly LENGTHADJUST_SPACING: number;
-    readonly LENGTHADJUST_SPACINGANDGLYPHS: number;
-    readonly LENGTHADJUST_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTextContentElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTextContentElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGTextContentElement: {
-    prototype: SVGTextContentElement;
-    new(): SVGTextContentElement;
-    readonly LENGTHADJUST_SPACING: number;
-    readonly LENGTHADJUST_SPACINGANDGLYPHS: number;
-    readonly LENGTHADJUST_UNKNOWN: number;
-};
-
-interface SVGTextElement extends SVGTextPositioningElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTextElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTextElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGTextElement: {
-    prototype: SVGTextElement;
-    new(): SVGTextElement;
-};
-
-interface SVGTextPathElement extends SVGTextContentElement, SVGURIReference {
-    readonly method: SVGAnimatedEnumeration;
-    readonly spacing: SVGAnimatedEnumeration;
-    readonly startOffset: SVGAnimatedLength;
-    readonly TEXTPATH_METHODTYPE_ALIGN: number;
-    readonly TEXTPATH_METHODTYPE_STRETCH: number;
-    readonly TEXTPATH_METHODTYPE_UNKNOWN: number;
-    readonly TEXTPATH_SPACINGTYPE_AUTO: number;
-    readonly TEXTPATH_SPACINGTYPE_EXACT: number;
-    readonly TEXTPATH_SPACINGTYPE_UNKNOWN: number;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTextPathElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTextPathElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGTextPathElement: {
-    prototype: SVGTextPathElement;
-    new(): SVGTextPathElement;
-    readonly TEXTPATH_METHODTYPE_ALIGN: number;
-    readonly TEXTPATH_METHODTYPE_STRETCH: number;
-    readonly TEXTPATH_METHODTYPE_UNKNOWN: number;
-    readonly TEXTPATH_SPACINGTYPE_AUTO: number;
-    readonly TEXTPATH_SPACINGTYPE_EXACT: number;
-    readonly TEXTPATH_SPACINGTYPE_UNKNOWN: number;
-};
-
-interface SVGTextPositioningElement extends SVGTextContentElement {
-    readonly dx: SVGAnimatedLengthList;
-    readonly dy: SVGAnimatedLengthList;
-    readonly rotate: SVGAnimatedNumberList;
-    readonly x: SVGAnimatedLengthList;
-    readonly y: SVGAnimatedLengthList;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTextPositioningElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTextPositioningElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGTextPositioningElement: {
-    prototype: SVGTextPositioningElement;
-    new(): SVGTextPositioningElement;
-};
-
-interface SVGTitleElement extends SVGElement {
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTitleElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGTitleElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGTitleElement: {
-    prototype: SVGTitleElement;
-    new(): SVGTitleElement;
-};
-
-interface SVGTransform {
-    readonly angle: number;
-    readonly matrix: SVGMatrix;
-    readonly type: number;
-    setMatrix(matrix: SVGMatrix): void;
-    setRotate(angle: number, cx: number, cy: number): void;
-    setScale(sx: number, sy: number): void;
-    setSkewX(angle: number): void;
-    setSkewY(angle: number): void;
-    setTranslate(tx: number, ty: number): void;
-    readonly SVG_TRANSFORM_MATRIX: number;
-    readonly SVG_TRANSFORM_ROTATE: number;
-    readonly SVG_TRANSFORM_SCALE: number;
-    readonly SVG_TRANSFORM_SKEWX: number;
-    readonly SVG_TRANSFORM_SKEWY: number;
-    readonly SVG_TRANSFORM_TRANSLATE: number;
-    readonly SVG_TRANSFORM_UNKNOWN: number;
-}
-
-declare var SVGTransform: {
-    prototype: SVGTransform;
-    new(): SVGTransform;
-    readonly SVG_TRANSFORM_MATRIX: number;
-    readonly SVG_TRANSFORM_ROTATE: number;
-    readonly SVG_TRANSFORM_SCALE: number;
-    readonly SVG_TRANSFORM_SKEWX: number;
-    readonly SVG_TRANSFORM_SKEWY: number;
-    readonly SVG_TRANSFORM_TRANSLATE: number;
-    readonly SVG_TRANSFORM_UNKNOWN: number;
-};
-
-interface SVGTransformList {
-    readonly numberOfItems: number;
-    appendItem(newItem: SVGTransform): SVGTransform;
-    clear(): void;
-    consolidate(): SVGTransform;
-    createSVGTransformFromMatrix(matrix: SVGMatrix): SVGTransform;
-    getItem(index: number): SVGTransform;
-    initialize(newItem: SVGTransform): SVGTransform;
-    insertItemBefore(newItem: SVGTransform, index: number): SVGTransform;
-    removeItem(index: number): SVGTransform;
-    replaceItem(newItem: SVGTransform, index: number): SVGTransform;
-}
-
-declare var SVGTransformList: {
-    prototype: SVGTransformList;
-    new(): SVGTransformList;
-};
-
-interface SVGURIReference {
-    readonly href: SVGAnimatedString;
-}
-
-interface SVGUnitTypes {
-    readonly SVG_UNIT_TYPE_OBJECTBOUNDINGBOX: number;
-    readonly SVG_UNIT_TYPE_UNKNOWN: number;
-    readonly SVG_UNIT_TYPE_USERSPACEONUSE: number;
-}
-declare var SVGUnitTypes: SVGUnitTypes;
-
-interface SVGUseElement extends SVGGraphicsElement, SVGURIReference {
-    readonly animatedInstanceRoot: SVGElementInstance | null;
-    readonly height: SVGAnimatedLength;
-    readonly instanceRoot: SVGElementInstance | null;
-    readonly width: SVGAnimatedLength;
-    readonly x: SVGAnimatedLength;
-    readonly y: SVGAnimatedLength;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGUseElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGUseElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGUseElement: {
-    prototype: SVGUseElement;
-    new(): SVGUseElement;
-};
-
-interface SVGViewElement extends SVGElement, SVGFitToViewBox, SVGZoomAndPan {
-    /** @deprecated */
-    readonly viewTarget: SVGStringList;
-    addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGViewElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGViewElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SVGViewElement: {
-    prototype: SVGViewElement;
-    new(): SVGViewElement;
-};
-
-interface SVGZoomAndPan {
-    readonly zoomAndPan: number;
-}
-
-declare var SVGZoomAndPan: {
-    readonly SVG_ZOOMANDPAN_DISABLE: number;
-    readonly SVG_ZOOMANDPAN_MAGNIFY: number;
-    readonly SVG_ZOOMANDPAN_UNKNOWN: number;
-};
-
-interface SVGZoomEvent extends UIEvent {
-    readonly newScale: number;
-    readonly newTranslate: SVGPoint;
-    readonly previousScale: number;
-    readonly previousTranslate: SVGPoint;
-    readonly zoomRectScreen: SVGRect;
-}
-
-declare var SVGZoomEvent: {
-    prototype: SVGZoomEvent;
-    new(): SVGZoomEvent;
-};
-
-interface ScopedCredential {
-    readonly id: ArrayBuffer;
-    readonly type: ScopedCredentialType;
-}
-
-declare var ScopedCredential: {
-    prototype: ScopedCredential;
-    new(): ScopedCredential;
-};
-
-interface ScopedCredentialInfo {
-    readonly credential: ScopedCredential;
-    readonly publicKey: CryptoKey;
-}
-
-declare var ScopedCredentialInfo: {
-    prototype: ScopedCredentialInfo;
-    new(): ScopedCredentialInfo;
-};
-
-interface ScreenEventMap {
-    "MSOrientationChange": Event;
-}
-
-interface Screen extends EventTarget {
-    readonly availHeight: number;
-    readonly availWidth: number;
-    /** @deprecated */
-    bufferDepth: number;
-    readonly colorDepth: number;
-    readonly deviceXDPI: number;
-    readonly deviceYDPI: number;
-    readonly fontSmoothingEnabled: boolean;
-    readonly height: number;
-    readonly logicalXDPI: number;
-    readonly logicalYDPI: number;
-    readonly msOrientation: string;
-    onmsorientationchange: ((this: Screen, ev: Event) => any) | null;
-    readonly pixelDepth: number;
-    readonly systemXDPI: number;
-    readonly systemYDPI: number;
-    readonly width: number;
-    lockOrientation(orientations: OrientationLockType | OrientationLockType[]): boolean;
-    msLockOrientation(orientations: string | string[]): boolean;
-    msUnlockOrientation(): void;
-    unlockOrientation(): void;
-    addEventListener<K extends keyof ScreenEventMap>(type: K, listener: (this: Screen, ev: ScreenEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof ScreenEventMap>(type: K, listener: (this: Screen, ev: ScreenEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var Screen: {
-    prototype: Screen;
-    new(): Screen;
-};
-
-interface ScriptProcessorNodeEventMap {
-    "audioprocess": AudioProcessingEvent;
-}
-
-interface ScriptProcessorNode extends AudioNode {
-    /** @deprecated */
-    readonly bufferSize: number;
-    /** @deprecated */
-    onaudioprocess: ((this: ScriptProcessorNode, ev: AudioProcessingEvent) => any) | null;
-    addEventListener<K extends keyof ScriptProcessorNodeEventMap>(type: K, listener: (this: ScriptProcessorNode, ev: ScriptProcessorNodeEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof ScriptProcessorNodeEventMap>(type: K, listener: (this: ScriptProcessorNode, ev: ScriptProcessorNodeEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var ScriptProcessorNode: {
-    prototype: ScriptProcessorNode;
-    new(): ScriptProcessorNode;
-};
-
-interface ScrollIntoViewOptions extends ScrollOptions {
-    block?: ScrollLogicalPosition;
-    inline?: ScrollLogicalPosition;
-}
-
-interface ScrollOptions {
-    behavior?: ScrollBehavior;
-}
-
-interface ScrollToOptions extends ScrollOptions {
-    left?: number;
-    top?: number;
-}
-
-interface SecurityPolicyViolationEvent extends Event {
-    readonly blockedURI: string;
-    readonly columnNumber: number;
-    readonly documentURI: string;
-    readonly effectiveDirective: string;
-    readonly lineNumber: number;
-    readonly originalPolicy: string;
-    readonly referrer: string;
-    readonly sourceFile: string;
-    readonly statusCode: number;
-    readonly violatedDirective: string;
-}
-
-declare var SecurityPolicyViolationEvent: {
-    prototype: SecurityPolicyViolationEvent;
-    new(type: string, eventInitDict?: SecurityPolicyViolationEventInit): SecurityPolicyViolationEvent;
-};
-
-interface Selection {
-    readonly anchorNode: Node;
-    readonly anchorOffset: number;
-    readonly baseNode: Node;
-    readonly baseOffset: number;
-    readonly extentNode: Node;
-    readonly extentOffset: number;
-    readonly focusNode: Node;
-    readonly focusOffset: number;
-    readonly isCollapsed: boolean;
-    readonly rangeCount: number;
-    readonly type: string;
-    addRange(range: Range): void;
-    collapse(parentNode: Node, offset: number): void;
-    collapseToEnd(): void;
-    collapseToStart(): void;
-    containsNode(node: Node, partlyContained: boolean): boolean;
-    deleteFromDocument(): void;
-    empty(): void;
-    extend(newNode: Node, offset: number): void;
-    getRangeAt(index: number): Range;
-    removeAllRanges(): void;
-    removeRange(range: Range): void;
-    selectAllChildren(parentNode: Node): void;
-    setBaseAndExtent(baseNode: Node, baseOffset: number, extentNode: Node, extentOffset: number): void;
-    setPosition(parentNode: Node, offset: number): void;
-    toString(): string;
-}
-
-declare var Selection: {
-    prototype: Selection;
-    new(): Selection;
-};
-
-interface ServiceUIFrameContext {
-    getCachedFrameMessage(key: string): string;
-    postFrameMessage(key: string, data: string): void;
-}
-declare var ServiceUIFrameContext: ServiceUIFrameContext;
-
-interface ServiceWorkerEventMap extends AbstractWorkerEventMap {
-    "statechange": Event;
-}
-
-interface ServiceWorker extends EventTarget, AbstractWorker {
-    onstatechange: ((this: ServiceWorker, ev: Event) => any) | null;
-    readonly scriptURL: string;
-    readonly state: ServiceWorkerState;
-    postMessage(message: any, transfer?: any[]): void;
-    addEventListener<K extends keyof ServiceWorkerEventMap>(type: K, listener: (this: ServiceWorker, ev: ServiceWorkerEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof ServiceWorkerEventMap>(type: K, listener: (this: ServiceWorker, ev: ServiceWorkerEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var ServiceWorker: {
-    prototype: ServiceWorker;
-    new(): ServiceWorker;
-};
-
-interface ServiceWorkerContainerEventMap {
-    "controllerchange": Event;
-    "message": ServiceWorkerMessageEvent;
-    "messageerror": MessageEvent;
-}
-
-interface ServiceWorkerContainer extends EventTarget {
-    readonly controller: ServiceWorker | null;
-    oncontrollerchange: ((this: ServiceWorkerContainer, ev: Event) => any) | null;
-    onmessage: ((this: ServiceWorkerContainer, ev: ServiceWorkerMessageEvent) => any) | null;
-    onmessageerror: ((this: ServiceWorkerContainer, ev: MessageEvent) => any) | null;
-    readonly ready: Promise<ServiceWorkerRegistration>;
-    getRegistration(clientURL?: string): Promise<ServiceWorkerRegistration | undefined>;
-    getRegistrations(): Promise<ServiceWorkerRegistration[]>;
-    register(scriptURL: string, options?: RegistrationOptions): Promise<ServiceWorkerRegistration>;
-    startMessages(): void;
-    addEventListener<K extends keyof ServiceWorkerContainerEventMap>(type: K, listener: (this: ServiceWorkerContainer, ev: ServiceWorkerContainerEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof ServiceWorkerContainerEventMap>(type: K, listener: (this: ServiceWorkerContainer, ev: ServiceWorkerContainerEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var ServiceWorkerContainer: {
-    prototype: ServiceWorkerContainer;
-    new(): ServiceWorkerContainer;
-};
-
-interface ServiceWorkerMessageEvent extends Event {
-    readonly data: any;
-    readonly lastEventId: string;
-    readonly origin: string;
-    readonly ports: ReadonlyArray<MessagePort> | null;
-    readonly source: ServiceWorker | MessagePort | null;
-}
-
-declare var ServiceWorkerMessageEvent: {
-    prototype: ServiceWorkerMessageEvent;
-    new(type: string, eventInitDict?: ServiceWorkerMessageEventInit): ServiceWorkerMessageEvent;
-};
-
-interface ServiceWorkerRegistrationEventMap {
-    "updatefound": Event;
-}
-
-interface ServiceWorkerRegistration extends EventTarget {
-    readonly active: ServiceWorker | null;
-    readonly installing: ServiceWorker | null;
-    onupdatefound: ((this: ServiceWorkerRegistration, ev: Event) => any) | null;
-    readonly pushManager: PushManager;
-    readonly scope: string;
-    readonly sync: SyncManager;
-    readonly waiting: ServiceWorker | null;
-    getNotifications(filter?: GetNotificationOptions): Promise<Notification[]>;
-    showNotification(title: string, options?: NotificationOptions): Promise<void>;
-    unregister(): Promise<boolean>;
-    update(): Promise<void>;
-    addEventListener<K extends keyof ServiceWorkerRegistrationEventMap>(type: K, listener: (this: ServiceWorkerRegistration, ev: ServiceWorkerRegistrationEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof ServiceWorkerRegistrationEventMap>(type: K, listener: (this: ServiceWorkerRegistration, ev: ServiceWorkerRegistrationEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var ServiceWorkerRegistration: {
-    prototype: ServiceWorkerRegistration;
-    new(): ServiceWorkerRegistration;
-};
-
-interface ShadowRoot extends DocumentOrShadowRoot, DocumentFragment {
-    readonly host: Element;
-    innerHTML: string;
-}
-
-interface ShadowRootInit {
-    delegatesFocus?: boolean;
-    mode: "open" | "closed";
-}
-
-interface SourceBuffer extends EventTarget {
-    appendWindowEnd: number;
-    appendWindowStart: number;
-    readonly audioTracks: AudioTrackList;
-    readonly buffered: TimeRanges;
-    mode: AppendMode;
-    readonly textTracks: TextTrackList;
-    timestampOffset: number;
-    readonly updating: boolean;
-    readonly videoTracks: VideoTrackList;
-    abort(): void;
-    appendBuffer(data: ArrayBuffer | Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | null): void;
-    appendStream(stream: MSStream, maxSize?: number): void;
-    remove(start: number, end: number): void;
-}
-
-declare var SourceBuffer: {
-    prototype: SourceBuffer;
-    new(): SourceBuffer;
-};
-
-interface SourceBufferList extends EventTarget {
-    readonly length: number;
-    item(index: number): SourceBuffer;
-    [index: number]: SourceBuffer;
-}
-
-declare var SourceBufferList: {
-    prototype: SourceBufferList;
-    new(): SourceBufferList;
-};
-
-interface SpeechSynthesisEventMap {
-    "voiceschanged": Event;
-}
-
-interface SpeechSynthesis extends EventTarget {
-    onvoiceschanged: ((this: SpeechSynthesis, ev: Event) => any) | null;
-    readonly paused: boolean;
-    readonly pending: boolean;
-    readonly speaking: boolean;
-    cancel(): void;
-    getVoices(): SpeechSynthesisVoice[];
-    pause(): void;
-    resume(): void;
-    speak(utterance: SpeechSynthesisUtterance): void;
-    addEventListener<K extends keyof SpeechSynthesisEventMap>(type: K, listener: (this: SpeechSynthesis, ev: SpeechSynthesisEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SpeechSynthesisEventMap>(type: K, listener: (this: SpeechSynthesis, ev: SpeechSynthesisEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SpeechSynthesis: {
-    prototype: SpeechSynthesis;
-    new(): SpeechSynthesis;
-};
-
-interface SpeechSynthesisEvent extends Event {
-    readonly charIndex: number;
-    readonly charLength: number;
-    readonly elapsedTime: number;
-    readonly name: string;
-    readonly utterance: SpeechSynthesisUtterance;
-}
-
-declare var SpeechSynthesisEvent: {
-    prototype: SpeechSynthesisEvent;
-    new(type: string, eventInitDict?: SpeechSynthesisEventInit): SpeechSynthesisEvent;
-};
-
-interface SpeechSynthesisUtteranceEventMap {
-    "boundary": Event;
-    "end": Event;
-    "error": Event;
-    "mark": Event;
-    "pause": Event;
-    "resume": Event;
-    "start": Event;
-}
-
-interface SpeechSynthesisUtterance extends EventTarget {
-    lang: string;
-    onboundary: ((this: SpeechSynthesisUtterance, ev: Event) => any) | null;
-    onend: ((this: SpeechSynthesisUtterance, ev: Event) => any) | null;
-    onerror: ((this: SpeechSynthesisUtterance, ev: Event) => any) | null;
-    onmark: ((this: SpeechSynthesisUtterance, ev: Event) => any) | null;
-    onpause: ((this: SpeechSynthesisUtterance, ev: Event) => any) | null;
-    onresume: ((this: SpeechSynthesisUtterance, ev: Event) => any) | null;
-    onstart: ((this: SpeechSynthesisUtterance, ev: Event) => any) | null;
-    pitch: number;
-    rate: number;
-    text: string;
-    voice: SpeechSynthesisVoice;
-    volume: number;
-    addEventListener<K extends keyof SpeechSynthesisUtteranceEventMap>(type: K, listener: (this: SpeechSynthesisUtterance, ev: SpeechSynthesisUtteranceEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof SpeechSynthesisUtteranceEventMap>(type: K, listener: (this: SpeechSynthesisUtterance, ev: SpeechSynthesisUtteranceEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var SpeechSynthesisUtterance: {
-    prototype: SpeechSynthesisUtterance;
-    new(): SpeechSynthesisUtterance;
-    new(text: string): SpeechSynthesisUtterance;
-};
-
-interface SpeechSynthesisVoice {
-    readonly default: boolean;
-    readonly lang: string;
-    readonly localService: boolean;
-    readonly name: string;
-    readonly voiceURI: string;
-}
-
-declare var SpeechSynthesisVoice: {
-    prototype: SpeechSynthesisVoice;
-    new(): SpeechSynthesisVoice;
-};
-
-interface StereoPannerNode extends AudioNode {
-    readonly pan: AudioParam;
-}
-
-declare var StereoPannerNode: {
-    prototype: StereoPannerNode;
-    new(): StereoPannerNode;
-};
-
-interface Storage {
-    readonly length: number;
-    clear(): void;
-    getItem(key: string): string | null;
-    key(index: number): string | null;
-    removeItem(key: string): void;
-    setItem(key: string, value: string): void;
-    [key: string]: any;
-}
-
-declare var Storage: {
-    prototype: Storage;
-    new(): Storage;
-};
-
-interface StorageEvent extends Event {
-    readonly key: string | null;
-    readonly newValue: string | null;
-    readonly oldValue: string | null;
-    readonly storageArea: Storage | null;
-    readonly url: string;
-}
-
-declare var StorageEvent: {
-    prototype: StorageEvent;
-    new (type: string, eventInitDict?: StorageEventInit): StorageEvent;
-};
-
-interface StorageEventInit extends EventInit {
-    key?: string;
-    newValue?: string;
-    oldValue?: string;
-    storageArea?: Storage;
-    url: string;
-}
-
-interface StyleMedia {
-    readonly type: string;
-    matchMedium(mediaquery: string): boolean;
-}
-
-declare var StyleMedia: {
-    prototype: StyleMedia;
-    new(): StyleMedia;
-};
-
-interface StyleSheet {
-    disabled: boolean;
-    readonly href: string | null;
-    readonly media: MediaList;
-    readonly ownerNode: Node;
-    readonly parentStyleSheet: StyleSheet | null;
-    readonly title: string | null;
-    readonly type: string;
-}
-
-declare var StyleSheet: {
-    prototype: StyleSheet;
-    new(): StyleSheet;
-};
-
-interface StyleSheetList {
-    readonly length: number;
-    item(index: number): StyleSheet | null;
-    [index: number]: StyleSheet;
-}
-
-declare var StyleSheetList: {
-    prototype: StyleSheetList;
-    new(): StyleSheetList;
-};
-
-interface SubtleCrypto {
-    decrypt(algorithm: string | RsaOaepParams | AesCtrParams | AesCbcParams | AesCmacParams | AesGcmParams | AesCfbParams, key: CryptoKey, data: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer): PromiseLike<ArrayBuffer>;
-    deriveBits(algorithm: string | EcdhKeyDeriveParams | DhKeyDeriveParams | ConcatParams | HkdfCtrParams | Pbkdf2Params, baseKey: CryptoKey, length: number): PromiseLike<ArrayBuffer>;
-    deriveKey(algorithm: string | EcdhKeyDeriveParams | DhKeyDeriveParams | ConcatParams | HkdfCtrParams | Pbkdf2Params, baseKey: CryptoKey, derivedKeyType: string | AesDerivedKeyParams | HmacImportParams | ConcatParams | HkdfCtrParams | Pbkdf2Params, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKey>;
-    digest(algorithm: string | Algorithm, data: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer): PromiseLike<ArrayBuffer>;
-    encrypt(algorithm: string | RsaOaepParams | AesCtrParams | AesCbcParams | AesCmacParams | AesGcmParams | AesCfbParams, key: CryptoKey, data: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer): PromiseLike<ArrayBuffer>;
-    exportKey(format: "jwk", key: CryptoKey): PromiseLike<JsonWebKey>;
-    exportKey(format: "raw" | "pkcs8" | "spki", key: CryptoKey): PromiseLike<ArrayBuffer>;
-    exportKey(format: string, key: CryptoKey): PromiseLike<JsonWebKey | ArrayBuffer>;
-    generateKey(algorithm: string, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKeyPair | CryptoKey>;
-    generateKey(algorithm: RsaHashedKeyGenParams | EcKeyGenParams | DhKeyGenParams, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKeyPair>;
-    generateKey(algorithm: AesKeyGenParams | HmacKeyGenParams | Pbkdf2Params, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKey>;
-    importKey(format: "jwk", keyData: JsonWebKey, algorithm: string | RsaHashedImportParams | EcKeyImportParams | HmacImportParams | DhImportKeyParams, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKey>;
-    importKey(format: "raw" | "pkcs8" | "spki", keyData: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer, algorithm: string | RsaHashedImportParams | EcKeyImportParams | HmacImportParams | DhImportKeyParams, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKey>;
-    importKey(format: string, keyData: JsonWebKey | Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer, algorithm: string | RsaHashedImportParams | EcKeyImportParams | HmacImportParams | DhImportKeyParams, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKey>;
-    sign(algorithm: string | RsaPssParams | EcdsaParams | AesCmacParams, key: CryptoKey, data: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer): PromiseLike<ArrayBuffer>;
-    unwrapKey(format: string, wrappedKey: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer, unwrappingKey: CryptoKey, unwrapAlgorithm: string | Algorithm, unwrappedKeyAlgorithm: string | Algorithm, extractable: boolean, keyUsages: string[]): PromiseLike<CryptoKey>;
-    verify(algorithm: string | RsaPssParams | EcdsaParams | AesCmacParams, key: CryptoKey, signature: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer, data: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer): PromiseLike<boolean>;
-    wrapKey(format: string, key: CryptoKey, wrappingKey: CryptoKey, wrapAlgorithm: string | Algorithm): PromiseLike<ArrayBuffer>;
-}
-
-declare var SubtleCrypto: {
-    prototype: SubtleCrypto;
-    new(): SubtleCrypto;
-};
-
-interface SyncManager {
-    getTags(): Promise<string[]>;
-    register(tag: string): Promise<void>;
-}
-
-declare var SyncManager: {
-    prototype: SyncManager;
-    new(): SyncManager;
-};
-
-interface Text extends CharacterData {
-    readonly assignedSlot: HTMLSlotElement | null;
-    readonly wholeText: string;
-    splitText(offset: number): Text;
-}
-
-declare var Text: {
-    prototype: Text;
-    new(data?: string): Text;
-};
-
-interface TextDecoder {
-    readonly encoding: string;
-    readonly fatal: boolean;
-    readonly ignoreBOM: boolean;
-    decode(input?: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null, options?: TextDecodeOptions): string;
-}
-
-declare var TextDecoder: {
-    prototype: TextDecoder;
-    new(label?: string, options?: TextDecoderOptions): TextDecoder;
-};
-
-interface TextEncoder {
-    readonly encoding: string;
-    encode(input?: string): Uint8Array;
-}
-
-declare var TextEncoder: {
-    prototype: TextEncoder;
-    new(): TextEncoder;
-};
-
-interface TextEvent extends UIEvent {
-    readonly data: string;
-    initTextEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, dataArg: string, inputMethod: number, locale: string): void;
-    readonly DOM_INPUT_METHOD_DROP: number;
-    readonly DOM_INPUT_METHOD_HANDWRITING: number;
-    readonly DOM_INPUT_METHOD_IME: number;
-    readonly DOM_INPUT_METHOD_KEYBOARD: number;
-    readonly DOM_INPUT_METHOD_MULTIMODAL: number;
-    readonly DOM_INPUT_METHOD_OPTION: number;
-    readonly DOM_INPUT_METHOD_PASTE: number;
-    readonly DOM_INPUT_METHOD_SCRIPT: number;
-    readonly DOM_INPUT_METHOD_UNKNOWN: number;
-    readonly DOM_INPUT_METHOD_VOICE: number;
-}
-
-declare var TextEvent: {
-    prototype: TextEvent;
-    new(): TextEvent;
-    readonly DOM_INPUT_METHOD_DROP: number;
-    readonly DOM_INPUT_METHOD_HANDWRITING: number;
-    readonly DOM_INPUT_METHOD_IME: number;
-    readonly DOM_INPUT_METHOD_KEYBOARD: number;
-    readonly DOM_INPUT_METHOD_MULTIMODAL: number;
-    readonly DOM_INPUT_METHOD_OPTION: number;
-    readonly DOM_INPUT_METHOD_PASTE: number;
-    readonly DOM_INPUT_METHOD_SCRIPT: number;
-    readonly DOM_INPUT_METHOD_UNKNOWN: number;
-    readonly DOM_INPUT_METHOD_VOICE: number;
-};
-
-interface TextMetrics {
-    readonly width: number;
-}
-
-declare var TextMetrics: {
-    prototype: TextMetrics;
-    new(): TextMetrics;
-};
-
-interface TextTrackEventMap {
-    "cuechange": Event;
-    "error": Event;
-    "load": Event;
-}
-
-interface TextTrack extends EventTarget {
-    readonly activeCues: TextTrackCueList;
-    readonly cues: TextTrackCueList;
-    readonly inBandMetadataTrackDispatchType: string;
-    readonly kind: string;
-    readonly label: string;
-    readonly language: string;
-    mode: TextTrackMode | number;
-    oncuechange: ((this: TextTrack, ev: Event) => any) | null;
-    onerror: ((this: TextTrack, ev: Event) => any) | null;
-    onload: ((this: TextTrack, ev: Event) => any) | null;
-    readonly readyState: number;
-    addCue(cue: TextTrackCue): void;
-    removeCue(cue: TextTrackCue): void;
-    readonly DISABLED: number;
-    readonly ERROR: number;
-    readonly HIDDEN: number;
-    readonly LOADED: number;
-    readonly LOADING: number;
-    readonly NONE: number;
-    readonly SHOWING: number;
-    addEventListener<K extends keyof TextTrackEventMap>(type: K, listener: (this: TextTrack, ev: TextTrackEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof TextTrackEventMap>(type: K, listener: (this: TextTrack, ev: TextTrackEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var TextTrack: {
-    prototype: TextTrack;
-    new(): TextTrack;
-    readonly DISABLED: number;
-    readonly ERROR: number;
-    readonly HIDDEN: number;
-    readonly LOADED: number;
-    readonly LOADING: number;
-    readonly NONE: number;
-    readonly SHOWING: number;
-};
-
-interface TextTrackCueEventMap {
-    "enter": Event;
-    "exit": Event;
-}
-
-interface TextTrackCue extends EventTarget {
-    endTime: number;
-    id: string;
-    onenter: ((this: TextTrackCue, ev: Event) => any) | null;
-    onexit: ((this: TextTrackCue, ev: Event) => any) | null;
-    pauseOnExit: boolean;
-    startTime: number;
-    text: string;
-    readonly track: TextTrack;
-    getCueAsHTML(): DocumentFragment;
-    addEventListener<K extends keyof TextTrackCueEventMap>(type: K, listener: (this: TextTrackCue, ev: TextTrackCueEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof TextTrackCueEventMap>(type: K, listener: (this: TextTrackCue, ev: TextTrackCueEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var TextTrackCue: {
-    prototype: TextTrackCue;
-    new(startTime: number, endTime: number, text: string): TextTrackCue;
-};
-
-interface TextTrackCueList {
-    readonly length: number;
-    getCueById(id: string): TextTrackCue;
-    item(index: number): TextTrackCue;
-    [index: number]: TextTrackCue;
-}
-
-declare var TextTrackCueList: {
-    prototype: TextTrackCueList;
-    new(): TextTrackCueList;
-};
-
-interface TextTrackListEventMap {
-    "addtrack": TrackEvent;
-}
-
-interface TextTrackList extends EventTarget {
-    readonly length: number;
-    onaddtrack: ((this: TextTrackList, ev: TrackEvent) => any) | null;
-    item(index: number): TextTrack;
-    addEventListener<K extends keyof TextTrackListEventMap>(type: K, listener: (this: TextTrackList, ev: TextTrackListEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof TextTrackListEventMap>(type: K, listener: (this: TextTrackList, ev: TextTrackListEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-    [index: number]: TextTrack;
-}
-
-declare var TextTrackList: {
-    prototype: TextTrackList;
-    new(): TextTrackList;
-};
-
-interface TimeRanges {
-    readonly length: number;
-    end(index: number): number;
-    start(index: number): number;
-}
-
-declare var TimeRanges: {
-    prototype: TimeRanges;
-    new(): TimeRanges;
-};
-
-interface Touch {
-    readonly clientX: number;
-    readonly clientY: number;
-    readonly identifier: number;
-    readonly pageX: number;
-    readonly pageY: number;
-    readonly screenX: number;
-    readonly screenY: number;
-    readonly target: EventTarget;
-}
-
-declare var Touch: {
-    prototype: Touch;
-    new(): Touch;
-};
-
-interface TouchEvent extends UIEvent {
-    readonly altKey: boolean;
-    readonly changedTouches: TouchList;
-    readonly charCode: number;
-    readonly ctrlKey: boolean;
-    readonly keyCode: number;
-    readonly metaKey: boolean;
-    readonly shiftKey: boolean;
-    readonly targetTouches: TouchList;
-    readonly touches: TouchList;
-    /** @deprecated */
-    readonly which: number;
-}
-
-declare var TouchEvent: {
-    prototype: TouchEvent;
-    new(type: string, touchEventInit?: TouchEventInit): TouchEvent;
-};
-
-interface TouchEventInit extends EventModifierInit {
-    changedTouches?: Touch[];
-    targetTouches?: Touch[];
-    touches?: Touch[];
-}
-
-interface TouchList {
-    readonly length: number;
-    item(index: number): Touch | null;
-    [index: number]: Touch;
-}
-
-declare var TouchList: {
-    prototype: TouchList;
-    new(): TouchList;
-};
-
-interface TrackEvent extends Event {
-    readonly track: VideoTrack | AudioTrack | TextTrack | null;
-}
-
-declare var TrackEvent: {
-    prototype: TrackEvent;
-    new(typeArg: string, eventInitDict?: TrackEventInit): TrackEvent;
-};
-
-interface TransitionEvent extends Event {
-    readonly elapsedTime: number;
-    readonly propertyName: string;
-    initTransitionEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, propertyNameArg: string, elapsedTimeArg: number): void;
-}
-
-declare var TransitionEvent: {
-    prototype: TransitionEvent;
-    new(typeArg: string, eventInitDict?: TransitionEventInit): TransitionEvent;
-};
-
-interface TreeWalker {
-    currentNode: Node;
-    /** @deprecated */
-    readonly expandEntityReferences: boolean;
-    readonly filter: NodeFilter | null;
-    readonly root: Node;
-    readonly whatToShow: number;
-    firstChild(): Node | null;
-    lastChild(): Node | null;
-    nextNode(): Node | null;
-    nextSibling(): Node | null;
-    parentNode(): Node | null;
-    previousNode(): Node | null;
-    previousSibling(): Node | null;
-}
-
-declare var TreeWalker: {
-    prototype: TreeWalker;
-    new(): TreeWalker;
-};
-
-interface UIEvent extends Event {
-    readonly detail: number;
-    readonly view: Window;
-    initUIEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number): void;
-}
-
-declare var UIEvent: {
-    prototype: UIEvent;
-    new(typeArg: string, eventInitDict?: UIEventInit): UIEvent;
-};
-
-interface URL {
-    hash: string;
-    host: string;
-    hostname: string;
-    href: string;
-    readonly origin: string;
-    password: string;
-    pathname: string;
-    port: string;
-    protocol: string;
-    search: string;
-    readonly searchParams: URLSearchParams;
-    username: string;
-    toString(): string;
-}
-
-declare var URL: {
-    prototype: URL;
-    new(url: string, base?: string | URL): URL;
-    createObjectURL(object: any, options?: ObjectURLOptions): string;
-    revokeObjectURL(url: string): void;
-};
-
-interface URLSearchParams {
-    /**
-     * Appends a specified key/value pair as a new search parameter.
-     */
-    append(name: string, value: string): void;
-    /**
-     * Deletes the given search parameter, and its associated value, from the list of all search parameters.
-     */
-    delete(name: string): void;
-    /**
-     * Returns the first value associated to the given search parameter.
-     */
-    get(name: string): string | null;
-    /**
-     * Returns all the values association with a given search parameter.
-     */
-    getAll(name: string): string[];
-    /**
-     * Returns a Boolean indicating if such a search parameter exists.
-     */
-    has(name: string): boolean;
-    /**
-     * Sets the value associated to a given search parameter to the given value. If there were several values, delete the others.
-     */
-    set(name: string, value: string): void;
-}
-
-declare var URLSearchParams: {
-    prototype: URLSearchParams;
-    new (init?: string | URLSearchParams): URLSearchParams;
-};
-
-interface VRDisplay extends EventTarget {
-    readonly capabilities: VRDisplayCapabilities;
-    depthFar: number;
-    depthNear: number;
-    readonly displayId: number;
-    readonly displayName: string;
-    readonly isConnected: boolean;
-    readonly isPresenting: boolean;
-    readonly stageParameters: VRStageParameters | null;
-    cancelAnimationFrame(handle: number): void;
-    exitPresent(): Promise<void>;
-    getEyeParameters(whichEye: string): VREyeParameters;
-    getFrameData(frameData: VRFrameData): boolean;
-    getLayers(): VRLayer[];
-    /** @deprecated */
-    getPose(): VRPose;
-    requestAnimationFrame(callback: FrameRequestCallback): number;
-    requestPresent(layers: VRLayer[]): Promise<void>;
-    resetPose(): void;
-    submitFrame(pose?: VRPose): void;
-}
-
-declare var VRDisplay: {
-    prototype: VRDisplay;
-    new(): VRDisplay;
-};
-
-interface VRDisplayCapabilities {
-    readonly canPresent: boolean;
-    readonly hasExternalDisplay: boolean;
-    readonly hasOrientation: boolean;
-    readonly hasPosition: boolean;
-    readonly maxLayers: number;
-}
-
-declare var VRDisplayCapabilities: {
-    prototype: VRDisplayCapabilities;
-    new(): VRDisplayCapabilities;
-};
-
-interface VRDisplayEvent extends Event {
-    readonly display: VRDisplay;
-    readonly reason: VRDisplayEventReason | null;
-}
-
-declare var VRDisplayEvent: {
-    prototype: VRDisplayEvent;
-    new(type: string, eventInitDict: VRDisplayEventInit): VRDisplayEvent;
-};
-
-interface VREyeParameters {
-    /** @deprecated */
-    readonly fieldOfView: VRFieldOfView;
-    readonly offset: Float32Array;
-    readonly renderHeight: number;
-    readonly renderWidth: number;
-}
-
-declare var VREyeParameters: {
-    prototype: VREyeParameters;
-    new(): VREyeParameters;
-};
-
-interface VRFieldOfView {
-    readonly downDegrees: number;
-    readonly leftDegrees: number;
-    readonly rightDegrees: number;
-    readonly upDegrees: number;
-}
-
-declare var VRFieldOfView: {
-    prototype: VRFieldOfView;
-    new(): VRFieldOfView;
-};
-
-interface VRFrameData {
-    readonly leftProjectionMatrix: Float32Array;
-    readonly leftViewMatrix: Float32Array;
-    readonly pose: VRPose;
-    readonly rightProjectionMatrix: Float32Array;
-    readonly rightViewMatrix: Float32Array;
-    readonly timestamp: number;
-}
-
-declare var VRFrameData: {
-    prototype: VRFrameData;
-    new(): VRFrameData;
-};
-
-interface VRPose {
-    readonly angularAcceleration: Float32Array | null;
-    readonly angularVelocity: Float32Array | null;
-    readonly linearAcceleration: Float32Array | null;
-    readonly linearVelocity: Float32Array | null;
-    readonly orientation: Float32Array | null;
-    readonly position: Float32Array | null;
-    readonly timestamp: number;
-}
-
-declare var VRPose: {
-    prototype: VRPose;
-    new(): VRPose;
-};
-
-interface ValidityState {
-    readonly badInput: boolean;
-    readonly customError: boolean;
-    readonly patternMismatch: boolean;
-    readonly rangeOverflow: boolean;
-    readonly rangeUnderflow: boolean;
-    readonly stepMismatch: boolean;
-    readonly tooLong: boolean;
-    readonly tooShort: boolean;
-    readonly typeMismatch: boolean;
-    readonly valid: boolean;
-    readonly valueMissing: boolean;
-}
-
-declare var ValidityState: {
-    prototype: ValidityState;
-    new(): ValidityState;
-};
-
-interface VideoPlaybackQuality {
-    readonly corruptedVideoFrames: number;
-    readonly creationTime: number;
-    readonly droppedVideoFrames: number;
-    readonly totalFrameDelay: number;
-    readonly totalVideoFrames: number;
-}
-
-declare var VideoPlaybackQuality: {
-    prototype: VideoPlaybackQuality;
-    new(): VideoPlaybackQuality;
-};
-
-interface VideoTrack {
-    readonly id: string;
-    kind: string;
-    readonly label: string;
-    language: string;
-    selected: boolean;
-    readonly sourceBuffer: SourceBuffer;
-}
-
-declare var VideoTrack: {
-    prototype: VideoTrack;
-    new(): VideoTrack;
-};
-
-interface VideoTrackListEventMap {
-    "addtrack": TrackEvent;
-    "change": Event;
-    "removetrack": TrackEvent;
-}
-
-interface VideoTrackList extends EventTarget {
-    readonly length: number;
-    onaddtrack: ((this: VideoTrackList, ev: TrackEvent) => any) | null;
-    onchange: ((this: VideoTrackList, ev: Event) => any) | null;
-    onremovetrack: ((this: VideoTrackList, ev: TrackEvent) => any) | null;
-    readonly selectedIndex: number;
-    getTrackById(id: string): VideoTrack | null;
-    item(index: number): VideoTrack;
-    addEventListener<K extends keyof VideoTrackListEventMap>(type: K, listener: (this: VideoTrackList, ev: VideoTrackListEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof VideoTrackListEventMap>(type: K, listener: (this: VideoTrackList, ev: VideoTrackListEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-    [index: number]: VideoTrack;
-}
-
-declare var VideoTrackList: {
-    prototype: VideoTrackList;
-    new(): VideoTrackList;
-};
-
-interface WEBGL_color_buffer_float {
-    readonly FRAMEBUFFER_ATTACHMENT_COMPONENT_TYPE_EXT: number;
-    readonly RGB32F_EXT: number;
-    readonly RGBA32F_EXT: number;
-    readonly UNSIGNED_NORMALIZED_EXT: number;
-}
-
-interface WEBGL_compressed_texture_astc {
-    readonly COMPRESSED_RGBA_ASTC_10x10_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_10x5_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_10x6_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_10x8_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_12x10_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_12x12_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_4x4_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_5x4_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_5x5_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_6x5_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_6x6_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_8x5_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_8x6_KHR: number;
-    readonly COMPRESSED_RGBA_ASTC_8x8_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_10x10_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_10x5_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_10x6_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_10x8_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_12x10_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_12x12_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_4x4_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_5x4_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_5x5_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_6x5_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_6x6_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_8x5_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_8x6_KHR: number;
-    readonly COMPRESSED_SRGB8_ALPHA8_ASTC_8x8_KHR: number;
-    getSupportedProfiles(): string[];
-}
-
-interface WEBGL_compressed_texture_s3tc {
-    readonly COMPRESSED_RGBA_S3TC_DXT1_EXT: number;
-    readonly COMPRESSED_RGBA_S3TC_DXT3_EXT: number;
-    readonly COMPRESSED_RGBA_S3TC_DXT5_EXT: number;
-    readonly COMPRESSED_RGB_S3TC_DXT1_EXT: number;
-}
-
-declare var WEBGL_compressed_texture_s3tc: {
-    prototype: WEBGL_compressed_texture_s3tc;
-    new(): WEBGL_compressed_texture_s3tc;
-    readonly COMPRESSED_RGBA_S3TC_DXT1_EXT: number;
-    readonly COMPRESSED_RGBA_S3TC_DXT3_EXT: number;
-    readonly COMPRESSED_RGBA_S3TC_DXT5_EXT: number;
-    readonly COMPRESSED_RGB_S3TC_DXT1_EXT: number;
-};
-
-interface WEBGL_compressed_texture_s3tc_srgb {
-    readonly COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT: number;
-    readonly COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT: number;
-    readonly COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT: number;
-    readonly COMPRESSED_SRGB_S3TC_DXT1_EXT: number;
-}
-
-interface WEBGL_debug_renderer_info {
-    readonly UNMASKED_RENDERER_WEBGL: number;
-    readonly UNMASKED_VENDOR_WEBGL: number;
-}
-
-declare var WEBGL_debug_renderer_info: {
-    prototype: WEBGL_debug_renderer_info;
-    new(): WEBGL_debug_renderer_info;
-    readonly UNMASKED_RENDERER_WEBGL: number;
-    readonly UNMASKED_VENDOR_WEBGL: number;
-};
-
-interface WEBGL_debug_shaders {
-    getTranslatedShaderSource(shader: WebGLShader): string;
-}
-
-interface WEBGL_depth_texture {
-    readonly UNSIGNED_INT_24_8_WEBGL: number;
-}
-
-declare var WEBGL_depth_texture: {
-    prototype: WEBGL_depth_texture;
-    new(): WEBGL_depth_texture;
-    readonly UNSIGNED_INT_24_8_WEBGL: number;
-};
-
-interface WEBGL_draw_buffers {
-    readonly COLOR_ATTACHMENT0_WEBGL: number;
-    readonly COLOR_ATTACHMENT10_WEBGL: number;
-    readonly COLOR_ATTACHMENT11_WEBGL: number;
-    readonly COLOR_ATTACHMENT12_WEBGL: number;
-    readonly COLOR_ATTACHMENT13_WEBGL: number;
-    readonly COLOR_ATTACHMENT14_WEBGL: number;
-    readonly COLOR_ATTACHMENT15_WEBGL: number;
-    readonly COLOR_ATTACHMENT1_WEBGL: number;
-    readonly COLOR_ATTACHMENT2_WEBGL: number;
-    readonly COLOR_ATTACHMENT3_WEBGL: number;
-    readonly COLOR_ATTACHMENT4_WEBGL: number;
-    readonly COLOR_ATTACHMENT5_WEBGL: number;
-    readonly COLOR_ATTACHMENT6_WEBGL: number;
-    readonly COLOR_ATTACHMENT7_WEBGL: number;
-    readonly COLOR_ATTACHMENT8_WEBGL: number;
-    readonly COLOR_ATTACHMENT9_WEBGL: number;
-    readonly DRAW_BUFFER0_WEBGL: number;
-    readonly DRAW_BUFFER10_WEBGL: number;
-    readonly DRAW_BUFFER11_WEBGL: number;
-    readonly DRAW_BUFFER12_WEBGL: number;
-    readonly DRAW_BUFFER13_WEBGL: number;
-    readonly DRAW_BUFFER14_WEBGL: number;
-    readonly DRAW_BUFFER15_WEBGL: number;
-    readonly DRAW_BUFFER1_WEBGL: number;
-    readonly DRAW_BUFFER2_WEBGL: number;
-    readonly DRAW_BUFFER3_WEBGL: number;
-    readonly DRAW_BUFFER4_WEBGL: number;
-    readonly DRAW_BUFFER5_WEBGL: number;
-    readonly DRAW_BUFFER6_WEBGL: number;
-    readonly DRAW_BUFFER7_WEBGL: number;
-    readonly DRAW_BUFFER8_WEBGL: number;
-    readonly DRAW_BUFFER9_WEBGL: number;
-    readonly MAX_COLOR_ATTACHMENTS_WEBGL: number;
-    readonly MAX_DRAW_BUFFERS_WEBGL: number;
-    drawBuffersWEBGL(buffers: number[]): void;
-}
-
-interface WEBGL_lose_context {
-    loseContext(): void;
-    restoreContext(): void;
-}
-
-interface WaveShaperNode extends AudioNode {
-    curve: Float32Array | null;
-    oversample: OverSampleType;
-}
-
-declare var WaveShaperNode: {
-    prototype: WaveShaperNode;
-    new(): WaveShaperNode;
-};
-
-interface WebAuthentication {
-    getAssertion(assertionChallenge: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null, options?: AssertionOptions): Promise<WebAuthnAssertion>;
-    makeCredential(accountInformation: Account, cryptoParameters: ScopedCredentialParameters[], attestationChallenge: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null, options?: ScopedCredentialOptions): Promise<ScopedCredentialInfo>;
-}
-
-declare var WebAuthentication: {
-    prototype: WebAuthentication;
-    new(): WebAuthentication;
-};
-
-interface WebAuthnAssertion {
-    readonly authenticatorData: ArrayBuffer;
-    readonly clientData: ArrayBuffer;
-    readonly credential: ScopedCredential;
-    readonly signature: ArrayBuffer;
-}
-
-declare var WebAuthnAssertion: {
-    prototype: WebAuthnAssertion;
-    new(): WebAuthnAssertion;
-};
-
-interface WebGLActiveInfo {
-    readonly name: string;
-    readonly size: number;
-    readonly type: number;
-}
-
-declare var WebGLActiveInfo: {
-    prototype: WebGLActiveInfo;
-    new(): WebGLActiveInfo;
-};
-
-interface WebGLBuffer extends WebGLObject {
-}
-
-declare var WebGLBuffer: {
-    prototype: WebGLBuffer;
-    new(): WebGLBuffer;
-};
-
-interface WebGLContextEvent extends Event {
-    readonly statusMessage: string;
-}
-
-declare var WebGLContextEvent: {
-    prototype: WebGLContextEvent;
-    new(typeArg: string, eventInitDict?: WebGLContextEventInit): WebGLContextEvent;
-};
-
-interface WebGLFramebuffer extends WebGLObject {
-}
-
-declare var WebGLFramebuffer: {
-    prototype: WebGLFramebuffer;
-    new(): WebGLFramebuffer;
-};
-
-interface WebGLObject {
-}
-
-declare var WebGLObject: {
-    prototype: WebGLObject;
-    new(): WebGLObject;
-};
-
-interface WebGLProgram extends WebGLObject {
-}
-
-declare var WebGLProgram: {
-    prototype: WebGLProgram;
-    new(): WebGLProgram;
-};
-
-interface WebGLRenderbuffer extends WebGLObject {
-}
-
-declare var WebGLRenderbuffer: {
-    prototype: WebGLRenderbuffer;
-    new(): WebGLRenderbuffer;
-};
-
-interface WebGLRenderingContext {
-    readonly canvas: HTMLCanvasElement;
-    readonly drawingBufferHeight: number;
-    readonly drawingBufferWidth: number;
-    activeTexture(texture: number): void;
-    attachShader(program: WebGLProgram | null, shader: WebGLShader | null): void;
-    bindAttribLocation(program: WebGLProgram | null, index: number, name: string): void;
-    bindBuffer(target: number, buffer: WebGLBuffer | null): void;
-    bindFramebuffer(target: number, framebuffer: WebGLFramebuffer | null): void;
-    bindRenderbuffer(target: number, renderbuffer: WebGLRenderbuffer | null): void;
-    bindTexture(target: number, texture: WebGLTexture | null): void;
-    blendColor(red: number, green: number, blue: number, alpha: number): void;
-    blendEquation(mode: number): void;
-    blendEquationSeparate(modeRGB: number, modeAlpha: number): void;
-    blendFunc(sfactor: number, dfactor: number): void;
-    blendFuncSeparate(srcRGB: number, dstRGB: number, srcAlpha: number, dstAlpha: number): void;
-    bufferData(target: number, size: number | Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null, usage: number): void;
-    bufferSubData(target: number, offset: number, data: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null): void;
-    checkFramebufferStatus(target: number): number;
-    clear(mask: number): void;
-    clearColor(red: number, green: number, blue: number, alpha: number): void;
-    clearDepth(depth: number): void;
-    clearStencil(s: number): void;
-    colorMask(red: boolean, green: boolean, blue: boolean, alpha: boolean): void;
-    compileShader(shader: WebGLShader | null): void;
-    compressedTexImage2D(target: number, level: number, internalformat: number, width: number, height: number, border: number, data: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | null): void;
-    compressedTexSubImage2D(target: number, level: number, xoffset: number, yoffset: number, width: number, height: number, format: number, data: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | null): void;
-    copyTexImage2D(target: number, level: number, internalformat: number, x: number, y: number, width: number, height: number, border: number): void;
-    copyTexSubImage2D(target: number, level: number, xoffset: number, yoffset: number, x: number, y: number, width: number, height: number): void;
-    createBuffer(): WebGLBuffer | null;
-    createFramebuffer(): WebGLFramebuffer | null;
-    createProgram(): WebGLProgram | null;
-    createRenderbuffer(): WebGLRenderbuffer | null;
-    createShader(type: number): WebGLShader | null;
-    createTexture(): WebGLTexture | null;
-    cullFace(mode: number): void;
-    deleteBuffer(buffer: WebGLBuffer | null): void;
-    deleteFramebuffer(framebuffer: WebGLFramebuffer | null): void;
-    deleteProgram(program: WebGLProgram | null): void;
-    deleteRenderbuffer(renderbuffer: WebGLRenderbuffer | null): void;
-    deleteShader(shader: WebGLShader | null): void;
-    deleteTexture(texture: WebGLTexture | null): void;
-    depthFunc(func: number): void;
-    depthMask(flag: boolean): void;
-    depthRange(zNear: number, zFar: number): void;
-    detachShader(program: WebGLProgram | null, shader: WebGLShader | null): void;
-    disable(cap: number): void;
-    disableVertexAttribArray(index: number): void;
-    drawArrays(mode: number, first: number, count: number): void;
-    drawElements(mode: number, count: number, type: number, offset: number): void;
-    enable(cap: number): void;
-    enableVertexAttribArray(index: number): void;
-    finish(): void;
-    flush(): void;
-    framebufferRenderbuffer(target: number, attachment: number, renderbuffertarget: number, renderbuffer: WebGLRenderbuffer | null): void;
-    framebufferTexture2D(target: number, attachment: number, textarget: number, texture: WebGLTexture | null, level: number): void;
-    frontFace(mode: number): void;
-    generateMipmap(target: number): void;
-    getActiveAttrib(program: WebGLProgram | null, index: number): WebGLActiveInfo | null;
-    getActiveUniform(program: WebGLProgram | null, index: number): WebGLActiveInfo | null;
-    getAttachedShaders(program: WebGLProgram | null): WebGLShader[] | null;
-    getAttribLocation(program: WebGLProgram | null, name: string): number;
-    getBufferParameter(target: number, pname: number): any;
-    getContextAttributes(): WebGLContextAttributes;
-    getError(): number;
-    getExtension(extensionName: "EXT_blend_minmax"): EXT_blend_minmax | null;
-    getExtension(extensionName: "EXT_texture_filter_anisotropic"): EXT_texture_filter_anisotropic | null;
-    getExtension(extensionName: "EXT_frag_depth"): EXT_frag_depth | null;
-    getExtension(extensionName: "EXT_shader_texture_lod"): EXT_shader_texture_lod | null;
-    getExtension(extensionName: "EXT_sRGB"): EXT_sRGB | null;
-    getExtension(extensionName: "OES_vertex_array_object"): OES_vertex_array_object | null;
-    getExtension(extensionName: "WEBGL_color_buffer_float"): WEBGL_color_buffer_float | null;
-    getExtension(extensionName: "WEBGL_compressed_texture_astc"): WEBGL_compressed_texture_astc | null;
-    getExtension(extensionName: "WEBGL_compressed_texture_s3tc_srgb"): WEBGL_compressed_texture_s3tc_srgb | null;
-    getExtension(extensionName: "WEBGL_debug_shaders"): WEBGL_debug_shaders | null;
-    getExtension(extensionName: "WEBGL_draw_buffers"): WEBGL_draw_buffers | null;
-    getExtension(extensionName: "WEBGL_lose_context"): WEBGL_lose_context | null;
-    getExtension(extensionName: "WEBGL_depth_texture"): WEBGL_depth_texture | null;
-    getExtension(extensionName: "WEBGL_debug_renderer_info"): WEBGL_debug_renderer_info | null;
-    getExtension(extensionName: "WEBGL_compressed_texture_s3tc"): WEBGL_compressed_texture_s3tc | null;
-    getExtension(extensionName: "OES_texture_half_float_linear"): OES_texture_half_float_linear | null;
-    getExtension(extensionName: "OES_texture_half_float"): OES_texture_half_float | null;
-    getExtension(extensionName: "OES_texture_float_linear"): OES_texture_float_linear | null;
-    getExtension(extensionName: "OES_texture_float"): OES_texture_float | null;
-    getExtension(extensionName: "OES_standard_derivatives"): OES_standard_derivatives | null;
-    getExtension(extensionName: "OES_element_index_uint"): OES_element_index_uint | null;
-    getExtension(extensionName: "ANGLE_instanced_arrays"): ANGLE_instanced_arrays | null;
-    getExtension(extensionName: string): any;
-    getFramebufferAttachmentParameter(target: number, attachment: number, pname: number): any;
-    getParameter(pname: number): any;
-    getProgramInfoLog(program: WebGLProgram | null): string | null;
-    getProgramParameter(program: WebGLProgram | null, pname: number): any;
-    getRenderbufferParameter(target: number, pname: number): any;
-    getShaderInfoLog(shader: WebGLShader | null): string | null;
-    getShaderParameter(shader: WebGLShader | null, pname: number): any;
-    getShaderPrecisionFormat(shadertype: number, precisiontype: number): WebGLShaderPrecisionFormat | null;
-    getShaderSource(shader: WebGLShader | null): string | null;
-    getSupportedExtensions(): string[] | null;
-    getTexParameter(target: number, pname: number): any;
-    getUniform(program: WebGLProgram | null, location: WebGLUniformLocation | null): any;
-    getUniformLocation(program: WebGLProgram | null, name: string): WebGLUniformLocation | null;
-    getVertexAttrib(index: number, pname: number): any;
-    getVertexAttribOffset(index: number, pname: number): number;
-    hint(target: number, mode: number): void;
-    isBuffer(buffer: WebGLBuffer | null): boolean;
-    isContextLost(): boolean;
-    isEnabled(cap: number): boolean;
-    isFramebuffer(framebuffer: WebGLFramebuffer | null): boolean;
-    isProgram(program: WebGLProgram | null): boolean;
-    isRenderbuffer(renderbuffer: WebGLRenderbuffer | null): boolean;
-    isShader(shader: WebGLShader | null): boolean;
-    isTexture(texture: WebGLTexture | null): boolean;
-    lineWidth(width: number): void;
-    linkProgram(program: WebGLProgram | null): void;
-    pixelStorei(pname: number, param: number | boolean): void;
-    polygonOffset(factor: number, units: number): void;
-    readPixels(x: number, y: number, width: number, height: number, format: number, type: number, pixels: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | null): void;
-    renderbufferStorage(target: number, internalformat: number, width: number, height: number): void;
-    sampleCoverage(value: number, invert: boolean): void;
-    scissor(x: number, y: number, width: number, height: number): void;
-    shaderSource(shader: WebGLShader | null, source: string): void;
-    stencilFunc(func: number, ref: number, mask: number): void;
-    stencilFuncSeparate(face: number, func: number, ref: number, mask: number): void;
-    stencilMask(mask: number): void;
-    stencilMaskSeparate(face: number, mask: number): void;
-    stencilOp(fail: number, zfail: number, zpass: number): void;
-    stencilOpSeparate(face: number, fail: number, zfail: number, zpass: number): void;
-    texImage2D(target: number, level: number, internalformat: number, width: number, height: number, border: number, format: number, type: number, pixels: ArrayBufferView | null): void;
-    texImage2D(target: number, level: number, internalformat: number, format: number, type: number, pixels: ImageBitmap | ImageData | HTMLVideoElement | HTMLImageElement | HTMLCanvasElement): void;
-    texParameterf(target: number, pname: number, param: number): void;
-    texParameteri(target: number, pname: number, param: number): void;
-    texSubImage2D(target: number, level: number, xoffset: number, yoffset: number, width: number, height: number, format: number, type: number, pixels: ArrayBufferView | null): void;
-    texSubImage2D(target: number, level: number, xoffset: number, yoffset: number, format: number, type: number, pixels: ImageBitmap | ImageData | HTMLVideoElement | HTMLImageElement | HTMLCanvasElement): void;
-    uniform1f(location: WebGLUniformLocation | null, x: number): void;
-    uniform1fv(location: WebGLUniformLocation | null, v: Float32Array | ArrayLike<number>): void;
-    uniform1i(location: WebGLUniformLocation | null, x: number): void;
-    uniform1iv(location: WebGLUniformLocation | null, v: Int32Array | ArrayLike<number>): void;
-    uniform2f(location: WebGLUniformLocation | null, x: number, y: number): void;
-    uniform2fv(location: WebGLUniformLocation | null, v: Float32Array | ArrayLike<number>): void;
-    uniform2i(location: WebGLUniformLocation | null, x: number, y: number): void;
-    uniform2iv(location: WebGLUniformLocation | null, v: Int32Array | ArrayLike<number>): void;
-    uniform3f(location: WebGLUniformLocation | null, x: number, y: number, z: number): void;
-    uniform3fv(location: WebGLUniformLocation | null, v: Float32Array | ArrayLike<number>): void;
-    uniform3i(location: WebGLUniformLocation | null, x: number, y: number, z: number): void;
-    uniform3iv(location: WebGLUniformLocation | null, v: Int32Array | ArrayLike<number>): void;
-    uniform4f(location: WebGLUniformLocation | null, x: number, y: number, z: number, w: number): void;
-    uniform4fv(location: WebGLUniformLocation | null, v: Float32Array | ArrayLike<number>): void;
-    uniform4i(location: WebGLUniformLocation | null, x: number, y: number, z: number, w: number): void;
-    uniform4iv(location: WebGLUniformLocation | null, v: Int32Array | ArrayLike<number>): void;
-    uniformMatrix2fv(location: WebGLUniformLocation | null, transpose: boolean, value: Float32Array | ArrayLike<number>): void;
-    uniformMatrix3fv(location: WebGLUniformLocation | null, transpose: boolean, value: Float32Array | ArrayLike<number>): void;
-    uniformMatrix4fv(location: WebGLUniformLocation | null, transpose: boolean, value: Float32Array | ArrayLike<number>): void;
-    useProgram(program: WebGLProgram | null): void;
-    validateProgram(program: WebGLProgram | null): void;
-    vertexAttrib1f(indx: number, x: number): void;
-    vertexAttrib1fv(indx: number, values: Float32Array | number[]): void;
-    vertexAttrib2f(indx: number, x: number, y: number): void;
-    vertexAttrib2fv(indx: number, values: Float32Array | number[]): void;
-    vertexAttrib3f(indx: number, x: number, y: number, z: number): void;
-    vertexAttrib3fv(indx: number, values: Float32Array | number[]): void;
-    vertexAttrib4f(indx: number, x: number, y: number, z: number, w: number): void;
-    vertexAttrib4fv(indx: number, values: Float32Array | number[]): void;
-    vertexAttribPointer(indx: number, size: number, type: number, normalized: boolean, stride: number, offset: number): void;
-    viewport(x: number, y: number, width: number, height: number): void;
-    readonly ACTIVE_ATTRIBUTES: number;
-    readonly ACTIVE_TEXTURE: number;
-    readonly ACTIVE_UNIFORMS: number;
-    readonly ALIASED_LINE_WIDTH_RANGE: number;
-    readonly ALIASED_POINT_SIZE_RANGE: number;
-    readonly ALPHA: number;
-    readonly ALPHA_BITS: number;
-    readonly ALWAYS: number;
-    readonly ARRAY_BUFFER: number;
-    readonly ARRAY_BUFFER_BINDING: number;
-    readonly ATTACHED_SHADERS: number;
-    readonly BACK: number;
-    readonly BLEND: number;
-    readonly BLEND_COLOR: number;
-    readonly BLEND_DST_ALPHA: number;
-    readonly BLEND_DST_RGB: number;
-    readonly BLEND_EQUATION: number;
-    readonly BLEND_EQUATION_ALPHA: number;
-    readonly BLEND_EQUATION_RGB: number;
-    readonly BLEND_SRC_ALPHA: number;
-    readonly BLEND_SRC_RGB: number;
-    readonly BLUE_BITS: number;
-    readonly BOOL: number;
-    readonly BOOL_VEC2: number;
-    readonly BOOL_VEC3: number;
-    readonly BOOL_VEC4: number;
-    readonly BROWSER_DEFAULT_WEBGL: number;
-    readonly BUFFER_SIZE: number;
-    readonly BUFFER_USAGE: number;
-    readonly BYTE: number;
-    readonly CCW: number;
-    readonly CLAMP_TO_EDGE: number;
-    readonly COLOR_ATTACHMENT0: number;
-    readonly COLOR_BUFFER_BIT: number;
-    readonly COLOR_CLEAR_VALUE: number;
-    readonly COLOR_WRITEMASK: number;
-    readonly COMPILE_STATUS: number;
-    readonly COMPRESSED_TEXTURE_FORMATS: number;
-    readonly CONSTANT_ALPHA: number;
-    readonly CONSTANT_COLOR: number;
-    readonly CONTEXT_LOST_WEBGL: number;
-    readonly CULL_FACE: number;
-    readonly CULL_FACE_MODE: number;
-    readonly CURRENT_PROGRAM: number;
-    readonly CURRENT_VERTEX_ATTRIB: number;
-    readonly CW: number;
-    readonly DECR: number;
-    readonly DECR_WRAP: number;
-    readonly DELETE_STATUS: number;
-    readonly DEPTH_ATTACHMENT: number;
-    readonly DEPTH_BITS: number;
-    readonly DEPTH_BUFFER_BIT: number;
-    readonly DEPTH_CLEAR_VALUE: number;
-    readonly DEPTH_COMPONENT: number;
-    readonly DEPTH_COMPONENT16: number;
-    readonly DEPTH_FUNC: number;
-    readonly DEPTH_RANGE: number;
-    readonly DEPTH_STENCIL: number;
-    readonly DEPTH_STENCIL_ATTACHMENT: number;
-    readonly DEPTH_TEST: number;
-    readonly DEPTH_WRITEMASK: number;
-    readonly DITHER: number;
-    readonly DONT_CARE: number;
-    readonly DST_ALPHA: number;
-    readonly DST_COLOR: number;
-    readonly DYNAMIC_DRAW: number;
-    readonly ELEMENT_ARRAY_BUFFER: number;
-    readonly ELEMENT_ARRAY_BUFFER_BINDING: number;
-    readonly EQUAL: number;
-    readonly FASTEST: number;
-    readonly FLOAT: number;
-    readonly FLOAT_MAT2: number;
-    readonly FLOAT_MAT3: number;
-    readonly FLOAT_MAT4: number;
-    readonly FLOAT_VEC2: number;
-    readonly FLOAT_VEC3: number;
-    readonly FLOAT_VEC4: number;
-    readonly FRAGMENT_SHADER: number;
-    readonly FRAMEBUFFER: number;
-    readonly FRAMEBUFFER_ATTACHMENT_OBJECT_NAME: number;
-    readonly FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE: number;
-    readonly FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACE: number;
-    readonly FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL: number;
-    readonly FRAMEBUFFER_BINDING: number;
-    readonly FRAMEBUFFER_COMPLETE: number;
-    readonly FRAMEBUFFER_INCOMPLETE_ATTACHMENT: number;
-    readonly FRAMEBUFFER_INCOMPLETE_DIMENSIONS: number;
-    readonly FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT: number;
-    readonly FRAMEBUFFER_UNSUPPORTED: number;
-    readonly FRONT: number;
-    readonly FRONT_AND_BACK: number;
-    readonly FRONT_FACE: number;
-    readonly FUNC_ADD: number;
-    readonly FUNC_REVERSE_SUBTRACT: number;
-    readonly FUNC_SUBTRACT: number;
-    readonly GENERATE_MIPMAP_HINT: number;
-    readonly GEQUAL: number;
-    readonly GREATER: number;
-    readonly GREEN_BITS: number;
-    readonly HIGH_FLOAT: number;
-    readonly HIGH_INT: number;
-    readonly IMPLEMENTATION_COLOR_READ_FORMAT: number;
-    readonly IMPLEMENTATION_COLOR_READ_TYPE: number;
-    readonly INCR: number;
-    readonly INCR_WRAP: number;
-    readonly INT: number;
-    readonly INT_VEC2: number;
-    readonly INT_VEC3: number;
-    readonly INT_VEC4: number;
-    readonly INVALID_ENUM: number;
-    readonly INVALID_FRAMEBUFFER_OPERATION: number;
-    readonly INVALID_OPERATION: number;
-    readonly INVALID_VALUE: number;
-    readonly INVERT: number;
-    readonly KEEP: number;
-    readonly LEQUAL: number;
-    readonly LESS: number;
-    readonly LINEAR: number;
-    readonly LINEAR_MIPMAP_LINEAR: number;
-    readonly LINEAR_MIPMAP_NEAREST: number;
-    readonly LINES: number;
-    readonly LINE_LOOP: number;
-    readonly LINE_STRIP: number;
-    readonly LINE_WIDTH: number;
-    readonly LINK_STATUS: number;
-    readonly LOW_FLOAT: number;
-    readonly LOW_INT: number;
-    readonly LUMINANCE: number;
-    readonly LUMINANCE_ALPHA: number;
-    readonly MAX_COMBINED_TEXTURE_IMAGE_UNITS: number;
-    readonly MAX_CUBE_MAP_TEXTURE_SIZE: number;
-    readonly MAX_FRAGMENT_UNIFORM_VECTORS: number;
-    readonly MAX_RENDERBUFFER_SIZE: number;
-    readonly MAX_TEXTURE_IMAGE_UNITS: number;
-    readonly MAX_TEXTURE_SIZE: number;
-    readonly MAX_VARYING_VECTORS: number;
-    readonly MAX_VERTEX_ATTRIBS: number;
-    readonly MAX_VERTEX_TEXTURE_IMAGE_UNITS: number;
-    readonly MAX_VERTEX_UNIFORM_VECTORS: number;
-    readonly MAX_VIEWPORT_DIMS: number;
-    readonly MEDIUM_FLOAT: number;
-    readonly MEDIUM_INT: number;
-    readonly MIRRORED_REPEAT: number;
-    readonly NEAREST: number;
-    readonly NEAREST_MIPMAP_LINEAR: number;
-    readonly NEAREST_MIPMAP_NEAREST: number;
-    readonly NEVER: number;
-    readonly NICEST: number;
-    readonly NONE: number;
-    readonly NOTEQUAL: number;
-    readonly NO_ERROR: number;
-    readonly ONE: number;
-    readonly ONE_MINUS_CONSTANT_ALPHA: number;
-    readonly ONE_MINUS_CONSTANT_COLOR: number;
-    readonly ONE_MINUS_DST_ALPHA: number;
-    readonly ONE_MINUS_DST_COLOR: number;
-    readonly ONE_MINUS_SRC_ALPHA: number;
-    readonly ONE_MINUS_SRC_COLOR: number;
-    readonly OUT_OF_MEMORY: number;
-    readonly PACK_ALIGNMENT: number;
-    readonly POINTS: number;
-    readonly POLYGON_OFFSET_FACTOR: number;
-    readonly POLYGON_OFFSET_FILL: number;
-    readonly POLYGON_OFFSET_UNITS: number;
-    readonly RED_BITS: number;
-    readonly RENDERBUFFER: number;
-    readonly RENDERBUFFER_ALPHA_SIZE: number;
-    readonly RENDERBUFFER_BINDING: number;
-    readonly RENDERBUFFER_BLUE_SIZE: number;
-    readonly RENDERBUFFER_DEPTH_SIZE: number;
-    readonly RENDERBUFFER_GREEN_SIZE: number;
-    readonly RENDERBUFFER_HEIGHT: number;
-    readonly RENDERBUFFER_INTERNAL_FORMAT: number;
-    readonly RENDERBUFFER_RED_SIZE: number;
-    readonly RENDERBUFFER_STENCIL_SIZE: number;
-    readonly RENDERBUFFER_WIDTH: number;
-    readonly RENDERER: number;
-    readonly REPEAT: number;
-    readonly REPLACE: number;
-    readonly RGB: number;
-    readonly RGB565: number;
-    readonly RGB5_A1: number;
-    readonly RGBA: number;
-    readonly RGBA4: number;
-    readonly SAMPLER_2D: number;
-    readonly SAMPLER_CUBE: number;
-    readonly SAMPLES: number;
-    readonly SAMPLE_ALPHA_TO_COVERAGE: number;
-    readonly SAMPLE_BUFFERS: number;
-    readonly SAMPLE_COVERAGE: number;
-    readonly SAMPLE_COVERAGE_INVERT: number;
-    readonly SAMPLE_COVERAGE_VALUE: number;
-    readonly SCISSOR_BOX: number;
-    readonly SCISSOR_TEST: number;
-    readonly SHADER_TYPE: number;
-    readonly SHADING_LANGUAGE_VERSION: number;
-    readonly SHORT: number;
-    readonly SRC_ALPHA: number;
-    readonly SRC_ALPHA_SATURATE: number;
-    readonly SRC_COLOR: number;
-    readonly STATIC_DRAW: number;
-    readonly STENCIL_ATTACHMENT: number;
-    readonly STENCIL_BACK_FAIL: number;
-    readonly STENCIL_BACK_FUNC: number;
-    readonly STENCIL_BACK_PASS_DEPTH_FAIL: number;
-    readonly STENCIL_BACK_PASS_DEPTH_PASS: number;
-    readonly STENCIL_BACK_REF: number;
-    readonly STENCIL_BACK_VALUE_MASK: number;
-    readonly STENCIL_BACK_WRITEMASK: number;
-    readonly STENCIL_BITS: number;
-    readonly STENCIL_BUFFER_BIT: number;
-    readonly STENCIL_CLEAR_VALUE: number;
-    readonly STENCIL_FAIL: number;
-    readonly STENCIL_FUNC: number;
-    readonly STENCIL_INDEX: number;
-    readonly STENCIL_INDEX8: number;
-    readonly STENCIL_PASS_DEPTH_FAIL: number;
-    readonly STENCIL_PASS_DEPTH_PASS: number;
-    readonly STENCIL_REF: number;
-    readonly STENCIL_TEST: number;
-    readonly STENCIL_VALUE_MASK: number;
-    readonly STENCIL_WRITEMASK: number;
-    readonly STREAM_DRAW: number;
-    readonly SUBPIXEL_BITS: number;
-    readonly TEXTURE: number;
-    readonly TEXTURE0: number;
-    readonly TEXTURE1: number;
-    readonly TEXTURE10: number;
-    readonly TEXTURE11: number;
-    readonly TEXTURE12: number;
-    readonly TEXTURE13: number;
-    readonly TEXTURE14: number;
-    readonly TEXTURE15: number;
-    readonly TEXTURE16: number;
-    readonly TEXTURE17: number;
-    readonly TEXTURE18: number;
-    readonly TEXTURE19: number;
-    readonly TEXTURE2: number;
-    readonly TEXTURE20: number;
-    readonly TEXTURE21: number;
-    readonly TEXTURE22: number;
-    readonly TEXTURE23: number;
-    readonly TEXTURE24: number;
-    readonly TEXTURE25: number;
-    readonly TEXTURE26: number;
-    readonly TEXTURE27: number;
-    readonly TEXTURE28: number;
-    readonly TEXTURE29: number;
-    readonly TEXTURE3: number;
-    readonly TEXTURE30: number;
-    readonly TEXTURE31: number;
-    readonly TEXTURE4: number;
-    readonly TEXTURE5: number;
-    readonly TEXTURE6: number;
-    readonly TEXTURE7: number;
-    readonly TEXTURE8: number;
-    readonly TEXTURE9: number;
-    readonly TEXTURE_2D: number;
-    readonly TEXTURE_BINDING_2D: number;
-    readonly TEXTURE_BINDING_CUBE_MAP: number;
-    readonly TEXTURE_CUBE_MAP: number;
-    readonly TEXTURE_CUBE_MAP_NEGATIVE_X: number;
-    readonly TEXTURE_CUBE_MAP_NEGATIVE_Y: number;
-    readonly TEXTURE_CUBE_MAP_NEGATIVE_Z: number;
-    readonly TEXTURE_CUBE_MAP_POSITIVE_X: number;
-    readonly TEXTURE_CUBE_MAP_POSITIVE_Y: number;
-    readonly TEXTURE_CUBE_MAP_POSITIVE_Z: number;
-    readonly TEXTURE_MAG_FILTER: number;
-    readonly TEXTURE_MIN_FILTER: number;
-    readonly TEXTURE_WRAP_S: number;
-    readonly TEXTURE_WRAP_T: number;
-    readonly TRIANGLES: number;
-    readonly TRIANGLE_FAN: number;
-    readonly TRIANGLE_STRIP: number;
-    readonly UNPACK_ALIGNMENT: number;
-    readonly UNPACK_COLORSPACE_CONVERSION_WEBGL: number;
-    readonly UNPACK_FLIP_Y_WEBGL: number;
-    readonly UNPACK_PREMULTIPLY_ALPHA_WEBGL: number;
-    readonly UNSIGNED_BYTE: number;
-    readonly UNSIGNED_INT: number;
-    readonly UNSIGNED_SHORT: number;
-    readonly UNSIGNED_SHORT_4_4_4_4: number;
-    readonly UNSIGNED_SHORT_5_5_5_1: number;
-    readonly UNSIGNED_SHORT_5_6_5: number;
-    readonly VALIDATE_STATUS: number;
-    readonly VENDOR: number;
-    readonly VERSION: number;
-    readonly VERTEX_ATTRIB_ARRAY_BUFFER_BINDING: number;
-    readonly VERTEX_ATTRIB_ARRAY_ENABLED: number;
-    readonly VERTEX_ATTRIB_ARRAY_NORMALIZED: number;
-    readonly VERTEX_ATTRIB_ARRAY_POINTER: number;
-    readonly VERTEX_ATTRIB_ARRAY_SIZE: number;
-    readonly VERTEX_ATTRIB_ARRAY_STRIDE: number;
-    readonly VERTEX_ATTRIB_ARRAY_TYPE: number;
-    readonly VERTEX_SHADER: number;
-    readonly VIEWPORT: number;
-    readonly ZERO: number;
-}
-
-declare var WebGLRenderingContext: {
-    prototype: WebGLRenderingContext;
-    new(): WebGLRenderingContext;
-    readonly ACTIVE_ATTRIBUTES: number;
-    readonly ACTIVE_TEXTURE: number;
-    readonly ACTIVE_UNIFORMS: number;
-    readonly ALIASED_LINE_WIDTH_RANGE: number;
-    readonly ALIASED_POINT_SIZE_RANGE: number;
-    readonly ALPHA: number;
-    readonly ALPHA_BITS: number;
-    readonly ALWAYS: number;
-    readonly ARRAY_BUFFER: number;
-    readonly ARRAY_BUFFER_BINDING: number;
-    readonly ATTACHED_SHADERS: number;
-    readonly BACK: number;
-    readonly BLEND: number;
-    readonly BLEND_COLOR: number;
-    readonly BLEND_DST_ALPHA: number;
-    readonly BLEND_DST_RGB: number;
-    readonly BLEND_EQUATION: number;
-    readonly BLEND_EQUATION_ALPHA: number;
-    readonly BLEND_EQUATION_RGB: number;
-    readonly BLEND_SRC_ALPHA: number;
-    readonly BLEND_SRC_RGB: number;
-    readonly BLUE_BITS: number;
-    readonly BOOL: number;
-    readonly BOOL_VEC2: number;
-    readonly BOOL_VEC3: number;
-    readonly BOOL_VEC4: number;
-    readonly BROWSER_DEFAULT_WEBGL: number;
-    readonly BUFFER_SIZE: number;
-    readonly BUFFER_USAGE: number;
-    readonly BYTE: number;
-    readonly CCW: number;
-    readonly CLAMP_TO_EDGE: number;
-    readonly COLOR_ATTACHMENT0: number;
-    readonly COLOR_BUFFER_BIT: number;
-    readonly COLOR_CLEAR_VALUE: number;
-    readonly COLOR_WRITEMASK: number;
-    readonly COMPILE_STATUS: number;
-    readonly COMPRESSED_TEXTURE_FORMATS: number;
-    readonly CONSTANT_ALPHA: number;
-    readonly CONSTANT_COLOR: number;
-    readonly CONTEXT_LOST_WEBGL: number;
-    readonly CULL_FACE: number;
-    readonly CULL_FACE_MODE: number;
-    readonly CURRENT_PROGRAM: number;
-    readonly CURRENT_VERTEX_ATTRIB: number;
-    readonly CW: number;
-    readonly DECR: number;
-    readonly DECR_WRAP: number;
-    readonly DELETE_STATUS: number;
-    readonly DEPTH_ATTACHMENT: number;
-    readonly DEPTH_BITS: number;
-    readonly DEPTH_BUFFER_BIT: number;
-    readonly DEPTH_CLEAR_VALUE: number;
-    readonly DEPTH_COMPONENT: number;
-    readonly DEPTH_COMPONENT16: number;
-    readonly DEPTH_FUNC: number;
-    readonly DEPTH_RANGE: number;
-    readonly DEPTH_STENCIL: number;
-    readonly DEPTH_STENCIL_ATTACHMENT: number;
-    readonly DEPTH_TEST: number;
-    readonly DEPTH_WRITEMASK: number;
-    readonly DITHER: number;
-    readonly DONT_CARE: number;
-    readonly DST_ALPHA: number;
-    readonly DST_COLOR: number;
-    readonly DYNAMIC_DRAW: number;
-    readonly ELEMENT_ARRAY_BUFFER: number;
-    readonly ELEMENT_ARRAY_BUFFER_BINDING: number;
-    readonly EQUAL: number;
-    readonly FASTEST: number;
-    readonly FLOAT: number;
-    readonly FLOAT_MAT2: number;
-    readonly FLOAT_MAT3: number;
-    readonly FLOAT_MAT4: number;
-    readonly FLOAT_VEC2: number;
-    readonly FLOAT_VEC3: number;
-    readonly FLOAT_VEC4: number;
-    readonly FRAGMENT_SHADER: number;
-    readonly FRAMEBUFFER: number;
-    readonly FRAMEBUFFER_ATTACHMENT_OBJECT_NAME: number;
-    readonly FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE: number;
-    readonly FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACE: number;
-    readonly FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL: number;
-    readonly FRAMEBUFFER_BINDING: number;
-    readonly FRAMEBUFFER_COMPLETE: number;
-    readonly FRAMEBUFFER_INCOMPLETE_ATTACHMENT: number;
-    readonly FRAMEBUFFER_INCOMPLETE_DIMENSIONS: number;
-    readonly FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT: number;
-    readonly FRAMEBUFFER_UNSUPPORTED: number;
-    readonly FRONT: number;
-    readonly FRONT_AND_BACK: number;
-    readonly FRONT_FACE: number;
-    readonly FUNC_ADD: number;
-    readonly FUNC_REVERSE_SUBTRACT: number;
-    readonly FUNC_SUBTRACT: number;
-    readonly GENERATE_MIPMAP_HINT: number;
-    readonly GEQUAL: number;
-    readonly GREATER: number;
-    readonly GREEN_BITS: number;
-    readonly HIGH_FLOAT: number;
-    readonly HIGH_INT: number;
-    readonly IMPLEMENTATION_COLOR_READ_FORMAT: number;
-    readonly IMPLEMENTATION_COLOR_READ_TYPE: number;
-    readonly INCR: number;
-    readonly INCR_WRAP: number;
-    readonly INT: number;
-    readonly INT_VEC2: number;
-    readonly INT_VEC3: number;
-    readonly INT_VEC4: number;
-    readonly INVALID_ENUM: number;
-    readonly INVALID_FRAMEBUFFER_OPERATION: number;
-    readonly INVALID_OPERATION: number;
-    readonly INVALID_VALUE: number;
-    readonly INVERT: number;
-    readonly KEEP: number;
-    readonly LEQUAL: number;
-    readonly LESS: number;
-    readonly LINEAR: number;
-    readonly LINEAR_MIPMAP_LINEAR: number;
-    readonly LINEAR_MIPMAP_NEAREST: number;
-    readonly LINES: number;
-    readonly LINE_LOOP: number;
-    readonly LINE_STRIP: number;
-    readonly LINE_WIDTH: number;
-    readonly LINK_STATUS: number;
-    readonly LOW_FLOAT: number;
-    readonly LOW_INT: number;
-    readonly LUMINANCE: number;
-    readonly LUMINANCE_ALPHA: number;
-    readonly MAX_COMBINED_TEXTURE_IMAGE_UNITS: number;
-    readonly MAX_CUBE_MAP_TEXTURE_SIZE: number;
-    readonly MAX_FRAGMENT_UNIFORM_VECTORS: number;
-    readonly MAX_RENDERBUFFER_SIZE: number;
-    readonly MAX_TEXTURE_IMAGE_UNITS: number;
-    readonly MAX_TEXTURE_SIZE: number;
-    readonly MAX_VARYING_VECTORS: number;
-    readonly MAX_VERTEX_ATTRIBS: number;
-    readonly MAX_VERTEX_TEXTURE_IMAGE_UNITS: number;
-    readonly MAX_VERTEX_UNIFORM_VECTORS: number;
-    readonly MAX_VIEWPORT_DIMS: number;
-    readonly MEDIUM_FLOAT: number;
-    readonly MEDIUM_INT: number;
-    readonly MIRRORED_REPEAT: number;
-    readonly NEAREST: number;
-    readonly NEAREST_MIPMAP_LINEAR: number;
-    readonly NEAREST_MIPMAP_NEAREST: number;
-    readonly NEVER: number;
-    readonly NICEST: number;
-    readonly NONE: number;
-    readonly NOTEQUAL: number;
-    readonly NO_ERROR: number;
-    readonly ONE: number;
-    readonly ONE_MINUS_CONSTANT_ALPHA: number;
-    readonly ONE_MINUS_CONSTANT_COLOR: number;
-    readonly ONE_MINUS_DST_ALPHA: number;
-    readonly ONE_MINUS_DST_COLOR: number;
-    readonly ONE_MINUS_SRC_ALPHA: number;
-    readonly ONE_MINUS_SRC_COLOR: number;
-    readonly OUT_OF_MEMORY: number;
-    readonly PACK_ALIGNMENT: number;
-    readonly POINTS: number;
-    readonly POLYGON_OFFSET_FACTOR: number;
-    readonly POLYGON_OFFSET_FILL: number;
-    readonly POLYGON_OFFSET_UNITS: number;
-    readonly RED_BITS: number;
-    readonly RENDERBUFFER: number;
-    readonly RENDERBUFFER_ALPHA_SIZE: number;
-    readonly RENDERBUFFER_BINDING: number;
-    readonly RENDERBUFFER_BLUE_SIZE: number;
-    readonly RENDERBUFFER_DEPTH_SIZE: number;
-    readonly RENDERBUFFER_GREEN_SIZE: number;
-    readonly RENDERBUFFER_HEIGHT: number;
-    readonly RENDERBUFFER_INTERNAL_FORMAT: number;
-    readonly RENDERBUFFER_RED_SIZE: number;
-    readonly RENDERBUFFER_STENCIL_SIZE: number;
-    readonly RENDERBUFFER_WIDTH: number;
-    readonly RENDERER: number;
-    readonly REPEAT: number;
-    readonly REPLACE: number;
-    readonly RGB: number;
-    readonly RGB565: number;
-    readonly RGB5_A1: number;
-    readonly RGBA: number;
-    readonly RGBA4: number;
-    readonly SAMPLER_2D: number;
-    readonly SAMPLER_CUBE: number;
-    readonly SAMPLES: number;
-    readonly SAMPLE_ALPHA_TO_COVERAGE: number;
-    readonly SAMPLE_BUFFERS: number;
-    readonly SAMPLE_COVERAGE: number;
-    readonly SAMPLE_COVERAGE_INVERT: number;
-    readonly SAMPLE_COVERAGE_VALUE: number;
-    readonly SCISSOR_BOX: number;
-    readonly SCISSOR_TEST: number;
-    readonly SHADER_TYPE: number;
-    readonly SHADING_LANGUAGE_VERSION: number;
-    readonly SHORT: number;
-    readonly SRC_ALPHA: number;
-    readonly SRC_ALPHA_SATURATE: number;
-    readonly SRC_COLOR: number;
-    readonly STATIC_DRAW: number;
-    readonly STENCIL_ATTACHMENT: number;
-    readonly STENCIL_BACK_FAIL: number;
-    readonly STENCIL_BACK_FUNC: number;
-    readonly STENCIL_BACK_PASS_DEPTH_FAIL: number;
-    readonly STENCIL_BACK_PASS_DEPTH_PASS: number;
-    readonly STENCIL_BACK_REF: number;
-    readonly STENCIL_BACK_VALUE_MASK: number;
-    readonly STENCIL_BACK_WRITEMASK: number;
-    readonly STENCIL_BITS: number;
-    readonly STENCIL_BUFFER_BIT: number;
-    readonly STENCIL_CLEAR_VALUE: number;
-    readonly STENCIL_FAIL: number;
-    readonly STENCIL_FUNC: number;
-    readonly STENCIL_INDEX: number;
-    readonly STENCIL_INDEX8: number;
-    readonly STENCIL_PASS_DEPTH_FAIL: number;
-    readonly STENCIL_PASS_DEPTH_PASS: number;
-    readonly STENCIL_REF: number;
-    readonly STENCIL_TEST: number;
-    readonly STENCIL_VALUE_MASK: number;
-    readonly STENCIL_WRITEMASK: number;
-    readonly STREAM_DRAW: number;
-    readonly SUBPIXEL_BITS: number;
-    readonly TEXTURE: number;
-    readonly TEXTURE0: number;
-    readonly TEXTURE1: number;
-    readonly TEXTURE10: number;
-    readonly TEXTURE11: number;
-    readonly TEXTURE12: number;
-    readonly TEXTURE13: number;
-    readonly TEXTURE14: number;
-    readonly TEXTURE15: number;
-    readonly TEXTURE16: number;
-    readonly TEXTURE17: number;
-    readonly TEXTURE18: number;
-    readonly TEXTURE19: number;
-    readonly TEXTURE2: number;
-    readonly TEXTURE20: number;
-    readonly TEXTURE21: number;
-    readonly TEXTURE22: number;
-    readonly TEXTURE23: number;
-    readonly TEXTURE24: number;
-    readonly TEXTURE25: number;
-    readonly TEXTURE26: number;
-    readonly TEXTURE27: number;
-    readonly TEXTURE28: number;
-    readonly TEXTURE29: number;
-    readonly TEXTURE3: number;
-    readonly TEXTURE30: number;
-    readonly TEXTURE31: number;
-    readonly TEXTURE4: number;
-    readonly TEXTURE5: number;
-    readonly TEXTURE6: number;
-    readonly TEXTURE7: number;
-    readonly TEXTURE8: number;
-    readonly TEXTURE9: number;
-    readonly TEXTURE_2D: number;
-    readonly TEXTURE_BINDING_2D: number;
-    readonly TEXTURE_BINDING_CUBE_MAP: number;
-    readonly TEXTURE_CUBE_MAP: number;
-    readonly TEXTURE_CUBE_MAP_NEGATIVE_X: number;
-    readonly TEXTURE_CUBE_MAP_NEGATIVE_Y: number;
-    readonly TEXTURE_CUBE_MAP_NEGATIVE_Z: number;
-    readonly TEXTURE_CUBE_MAP_POSITIVE_X: number;
-    readonly TEXTURE_CUBE_MAP_POSITIVE_Y: number;
-    readonly TEXTURE_CUBE_MAP_POSITIVE_Z: number;
-    readonly TEXTURE_MAG_FILTER: number;
-    readonly TEXTURE_MIN_FILTER: number;
-    readonly TEXTURE_WRAP_S: number;
-    readonly TEXTURE_WRAP_T: number;
-    readonly TRIANGLES: number;
-    readonly TRIANGLE_FAN: number;
-    readonly TRIANGLE_STRIP: number;
-    readonly UNPACK_ALIGNMENT: number;
-    readonly UNPACK_COLORSPACE_CONVERSION_WEBGL: number;
-    readonly UNPACK_FLIP_Y_WEBGL: number;
-    readonly UNPACK_PREMULTIPLY_ALPHA_WEBGL: number;
-    readonly UNSIGNED_BYTE: number;
-    readonly UNSIGNED_INT: number;
-    readonly UNSIGNED_SHORT: number;
-    readonly UNSIGNED_SHORT_4_4_4_4: number;
-    readonly UNSIGNED_SHORT_5_5_5_1: number;
-    readonly UNSIGNED_SHORT_5_6_5: number;
-    readonly VALIDATE_STATUS: number;
-    readonly VENDOR: number;
-    readonly VERSION: number;
-    readonly VERTEX_ATTRIB_ARRAY_BUFFER_BINDING: number;
-    readonly VERTEX_ATTRIB_ARRAY_ENABLED: number;
-    readonly VERTEX_ATTRIB_ARRAY_NORMALIZED: number;
-    readonly VERTEX_ATTRIB_ARRAY_POINTER: number;
-    readonly VERTEX_ATTRIB_ARRAY_SIZE: number;
-    readonly VERTEX_ATTRIB_ARRAY_STRIDE: number;
-    readonly VERTEX_ATTRIB_ARRAY_TYPE: number;
-    readonly VERTEX_SHADER: number;
-    readonly VIEWPORT: number;
-    readonly ZERO: number;
-};
-
-interface WebGLShader extends WebGLObject {
-}
-
-declare var WebGLShader: {
-    prototype: WebGLShader;
-    new(): WebGLShader;
-};
-
-interface WebGLShaderPrecisionFormat {
-    readonly precision: number;
-    readonly rangeMax: number;
-    readonly rangeMin: number;
-}
-
-declare var WebGLShaderPrecisionFormat: {
-    prototype: WebGLShaderPrecisionFormat;
-    new(): WebGLShaderPrecisionFormat;
-};
-
-interface WebGLTexture extends WebGLObject {
-}
-
-declare var WebGLTexture: {
-    prototype: WebGLTexture;
-    new(): WebGLTexture;
-};
-
-interface WebGLUniformLocation {
-}
-
-declare var WebGLUniformLocation: {
-    prototype: WebGLUniformLocation;
-    new(): WebGLUniformLocation;
-};
-
-interface WebGLVertexArrayObjectOES {
-}
-
-interface WebKitCSSMatrix {
-    a: number;
-    b: number;
-    c: number;
-    d: number;
-    e: number;
-    f: number;
-    m11: number;
-    m12: number;
-    m13: number;
-    m14: number;
-    m21: number;
-    m22: number;
-    m23: number;
-    m24: number;
-    m31: number;
-    m32: number;
-    m33: number;
-    m34: number;
-    m41: number;
-    m42: number;
-    m43: number;
-    m44: number;
-    inverse(): WebKitCSSMatrix;
-    multiply(secondMatrix: WebKitCSSMatrix): WebKitCSSMatrix;
-    rotate(angleX: number, angleY?: number, angleZ?: number): WebKitCSSMatrix;
-    rotateAxisAngle(x: number, y: number, z: number, angle: number): WebKitCSSMatrix;
-    scale(scaleX: number, scaleY?: number, scaleZ?: number): WebKitCSSMatrix;
-    setMatrixValue(value: string): void;
-    skewX(angle: number): WebKitCSSMatrix;
-    skewY(angle: number): WebKitCSSMatrix;
-    toString(): string;
-    translate(x: number, y: number, z?: number): WebKitCSSMatrix;
-}
-
-declare var WebKitCSSMatrix: {
-    prototype: WebKitCSSMatrix;
-    new(text?: string): WebKitCSSMatrix;
-};
-
-interface WebKitDirectoryEntry extends WebKitEntry {
-    createReader(): WebKitDirectoryReader;
-}
-
-declare var WebKitDirectoryEntry: {
-    prototype: WebKitDirectoryEntry;
-    new(): WebKitDirectoryEntry;
-};
-
-interface WebKitDirectoryReader {
-    readEntries(successCallback: WebKitEntriesCallback, errorCallback?: WebKitErrorCallback): void;
-}
-
-declare var WebKitDirectoryReader: {
-    prototype: WebKitDirectoryReader;
-    new(): WebKitDirectoryReader;
-};
-
-interface WebKitEntry {
-    readonly filesystem: WebKitFileSystem;
-    readonly fullPath: string;
-    readonly isDirectory: boolean;
-    readonly isFile: boolean;
-    readonly name: string;
-}
-
-declare var WebKitEntry: {
-    prototype: WebKitEntry;
-    new(): WebKitEntry;
-};
-
-interface WebKitFileEntry extends WebKitEntry {
-    file(successCallback: WebKitFileCallback, errorCallback?: WebKitErrorCallback): void;
-}
-
-declare var WebKitFileEntry: {
-    prototype: WebKitFileEntry;
-    new(): WebKitFileEntry;
-};
-
-interface WebKitFileSystem {
-    readonly name: string;
-    readonly root: WebKitDirectoryEntry;
-}
-
-declare var WebKitFileSystem: {
-    prototype: WebKitFileSystem;
-    new(): WebKitFileSystem;
-};
-
-interface WebKitPoint {
-    x: number;
-    y: number;
-}
-
-declare var WebKitPoint: {
-    prototype: WebKitPoint;
-    new(x?: number, y?: number): WebKitPoint;
-};
-
-interface WebSocketEventMap {
-    "close": CloseEvent;
-    "error": Event;
-    "message": MessageEvent;
-    "open": Event;
-}
-
-interface WebSocket extends EventTarget {
-    binaryType: BinaryType;
-    readonly bufferedAmount: number;
-    readonly extensions: string;
-    onclose: ((this: WebSocket, ev: CloseEvent) => any) | null;
-    onerror: ((this: WebSocket, ev: Event) => any) | null;
-    onmessage: ((this: WebSocket, ev: MessageEvent) => any) | null;
-    onopen: ((this: WebSocket, ev: Event) => any) | null;
-    readonly protocol: string;
-    readonly readyState: number;
-    readonly url: string;
-    close(code?: number, reason?: string): void;
-    send(data: string | ArrayBufferLike | Blob | ArrayBufferView): void;
-    readonly CLOSED: number;
-    readonly CLOSING: number;
-    readonly CONNECTING: number;
-    readonly OPEN: number;
-    addEventListener<K extends keyof WebSocketEventMap>(type: K, listener: (this: WebSocket, ev: WebSocketEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof WebSocketEventMap>(type: K, listener: (this: WebSocket, ev: WebSocketEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var WebSocket: {
-    prototype: WebSocket;
-    new(url: string, protocols?: string | string[]): WebSocket;
-    readonly CLOSED: number;
-    readonly CLOSING: number;
-    readonly CONNECTING: number;
-    readonly OPEN: number;
-};
-
-interface WheelEvent extends MouseEvent {
-    readonly deltaMode: number;
-    readonly deltaX: number;
-    readonly deltaY: number;
-    readonly deltaZ: number;
-    readonly wheelDelta: number;
-    readonly wheelDeltaX: number;
-    readonly wheelDeltaY: number;
-    getCurrentPoint(element: Element): void;
-    initWheelEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, viewArg: Window, detailArg: number, screenXArg: number, screenYArg: number, clientXArg: number, clientYArg: number, buttonArg: number, relatedTargetArg: EventTarget, modifiersListArg: string, deltaXArg: number, deltaYArg: number, deltaZArg: number, deltaMode: number): void;
-    readonly DOM_DELTA_LINE: number;
-    readonly DOM_DELTA_PAGE: number;
-    readonly DOM_DELTA_PIXEL: number;
-}
-
-declare var WheelEvent: {
-    prototype: WheelEvent;
-    new(typeArg: string, eventInitDict?: WheelEventInit): WheelEvent;
-    readonly DOM_DELTA_LINE: number;
-    readonly DOM_DELTA_PAGE: number;
-    readonly DOM_DELTA_PIXEL: number;
-};
-
-interface WindowEventMap extends GlobalEventHandlersEventMap {
-    "abort": UIEvent;
-    "afterprint": Event;
-    "beforeprint": Event;
-    "beforeunload": BeforeUnloadEvent;
-    "blur": FocusEvent;
-    "canplay": Event;
-    "canplaythrough": Event;
-    "change": Event;
-    "click": MouseEvent;
-    "compassneedscalibration": Event;
-    "contextmenu": PointerEvent;
-    "dblclick": MouseEvent;
-    "devicelight": DeviceLightEvent;
-    "devicemotion": DeviceMotionEvent;
-    "deviceorientation": DeviceOrientationEvent;
-    "drag": DragEvent;
-    "dragend": DragEvent;
-    "dragenter": DragEvent;
-    "dragleave": DragEvent;
-    "dragover": DragEvent;
-    "dragstart": DragEvent;
-    "drop": DragEvent;
-    "durationchange": Event;
-    "emptied": Event;
-    "ended": Event;
-    "error": ErrorEvent;
-    "focus": FocusEvent;
-    "hashchange": HashChangeEvent;
-    "input": Event;
-    "invalid": Event;
-    "keydown": KeyboardEvent;
-    "keypress": KeyboardEvent;
-    "keyup": KeyboardEvent;
-    "load": Event;
-    "loadeddata": Event;
-    "loadedmetadata": Event;
-    "loadstart": Event;
-    "message": MessageEvent;
-    "mousedown": MouseEvent;
-    "mouseenter": MouseEvent;
-    "mouseleave": MouseEvent;
-    "mousemove": MouseEvent;
-    "mouseout": MouseEvent;
-    "mouseover": MouseEvent;
-    "mouseup": MouseEvent;
-    "mousewheel": WheelEvent;
-    "MSGestureChange": Event;
-    "MSGestureDoubleTap": Event;
-    "MSGestureEnd": Event;
-    "MSGestureHold": Event;
-    "MSGestureStart": Event;
-    "MSGestureTap": Event;
-    "MSInertiaStart": Event;
-    "MSPointerCancel": Event;
-    "MSPointerDown": Event;
-    "MSPointerEnter": Event;
-    "MSPointerLeave": Event;
-    "MSPointerMove": Event;
-    "MSPointerOut": Event;
-    "MSPointerOver": Event;
-    "MSPointerUp": Event;
-    "offline": Event;
-    "online": Event;
-    "orientationchange": Event;
-    "pagehide": PageTransitionEvent;
-    "pageshow": PageTransitionEvent;
-    "pause": Event;
-    "play": Event;
-    "playing": Event;
-    "popstate": PopStateEvent;
-    "progress": ProgressEvent;
-    "ratechange": Event;
-    "readystatechange": ProgressEvent;
-    "reset": Event;
-    "resize": UIEvent;
-    "scroll": UIEvent;
-    "seeked": Event;
-    "seeking": Event;
-    "select": UIEvent;
-    "stalled": Event;
-    "storage": StorageEvent;
-    "submit": Event;
-    "suspend": Event;
-    "timeupdate": Event;
-    "touchcancel": TouchEvent;
-    "touchend": TouchEvent;
-    "touchmove": TouchEvent;
-    "touchstart": TouchEvent;
-    "unload": Event;
-    "volumechange": Event;
-    "vrdisplayactivate": Event;
-    "vrdisplayblur": Event;
-    "vrdisplayconnect": Event;
-    "vrdisplaydeactivate": Event;
-    "vrdisplaydisconnect": Event;
-    "vrdisplayfocus": Event;
-    "vrdisplaypointerrestricted": Event;
-    "vrdisplaypointerunrestricted": Event;
-    "vrdisplaypresentchange": Event;
-    "waiting": Event;
-}
-
-interface Window extends EventTarget, WindowTimers, WindowSessionStorage, WindowLocalStorage, WindowConsole, GlobalEventHandlers, IDBEnvironment, WindowBase64, GlobalFetch {
-    Blob: typeof Blob;
-    URL: typeof URL;
-    URLSearchParams: typeof URLSearchParams;
-    readonly applicationCache: ApplicationCache;
-    readonly caches: CacheStorage;
-    readonly clientInformation: Navigator;
-    readonly closed: boolean;
-    readonly crypto: Crypto;
-    customElements: CustomElementRegistry;
-    defaultStatus: string;
-    readonly devicePixelRatio: number;
-    readonly doNotTrack: string;
-    readonly document: Document;
-    event: Event | undefined;
-    readonly external: External;
-    readonly frameElement: Element;
-    readonly frames: Window;
-    readonly history: History;
-    readonly innerHeight: number;
-    readonly innerWidth: number;
-    readonly isSecureContext: boolean;
-    readonly length: number;
-    location: Location;
-    readonly locationbar: BarProp;
-    readonly menubar: BarProp;
-    readonly msContentScript: ExtensionScriptApis;
-    readonly msCredentials: MSCredentials;
-    name: string;
-    readonly navigator: Navigator;
-    offscreenBuffering: string | boolean;
-    onabort: ((this: Window, ev: UIEvent) => any) | null;
-    onafterprint: ((this: Window, ev: Event) => any) | null;
-    onbeforeprint: ((this: Window, ev: Event) => any) | null;
-    onbeforeunload: ((this: Window, ev: BeforeUnloadEvent) => any) | null;
-    onblur: ((this: Window, ev: FocusEvent) => any) | null;
-    oncanplay: ((this: Window, ev: Event) => any) | null;
-    oncanplaythrough: ((this: Window, ev: Event) => any) | null;
-    onchange: ((this: Window, ev: Event) => any) | null;
-    onclick: ((this: Window, ev: MouseEvent) => any) | null;
-    oncompassneedscalibration: ((this: Window, ev: Event) => any) | null;
-    oncontextmenu: ((this: Window, ev: PointerEvent) => any) | null;
-    ondblclick: ((this: Window, ev: MouseEvent) => any) | null;
-    ondevicelight: ((this: Window, ev: DeviceLightEvent) => any) | null;
-    ondevicemotion: ((this: Window, ev: DeviceMotionEvent) => any) | null;
-    ondeviceorientation: ((this: Window, ev: DeviceOrientationEvent) => any) | null;
-    ondrag: ((this: Window, ev: DragEvent) => any) | null;
-    ondragend: ((this: Window, ev: DragEvent) => any) | null;
-    ondragenter: ((this: Window, ev: DragEvent) => any) | null;
-    ondragleave: ((this: Window, ev: DragEvent) => any) | null;
-    ondragover: ((this: Window, ev: DragEvent) => any) | null;
-    ondragstart: ((this: Window, ev: DragEvent) => any) | null;
-    ondrop: ((this: Window, ev: DragEvent) => any) | null;
-    ondurationchange: ((this: Window, ev: Event) => any) | null;
-    onemptied: ((this: Window, ev: Event) => any) | null;
-    onended: ((this: Window, ev: Event) => any) | null;
-    onerror: ErrorEventHandler;
-    onfocus: ((this: Window, ev: FocusEvent) => any) | null;
-    onhashchange: ((this: Window, ev: HashChangeEvent) => any) | null;
-    oninput: ((this: Window, ev: Event) => any) | null;
-    oninvalid: ((this: Window, ev: Event) => any) | null;
-    onkeydown: ((this: Window, ev: KeyboardEvent) => any) | null;
-    onkeypress: ((this: Window, ev: KeyboardEvent) => any) | null;
-    onkeyup: ((this: Window, ev: KeyboardEvent) => any) | null;
-    onload: ((this: Window, ev: Event) => any) | null;
-    onloadeddata: ((this: Window, ev: Event) => any) | null;
-    onloadedmetadata: ((this: Window, ev: Event) => any) | null;
-    onloadstart: ((this: Window, ev: Event) => any) | null;
-    onmessage: ((this: Window, ev: MessageEvent) => any) | null;
-    onmousedown: ((this: Window, ev: MouseEvent) => any) | null;
-    onmouseenter: ((this: Window, ev: MouseEvent) => any) | null;
-    onmouseleave: ((this: Window, ev: MouseEvent) => any) | null;
-    onmousemove: ((this: Window, ev: MouseEvent) => any) | null;
-    onmouseout: ((this: Window, ev: MouseEvent) => any) | null;
-    onmouseover: ((this: Window, ev: MouseEvent) => any) | null;
-    onmouseup: ((this: Window, ev: MouseEvent) => any) | null;
-    onmousewheel: ((this: Window, ev: WheelEvent) => any) | null;
-    onmsgesturechange: ((this: Window, ev: Event) => any) | null;
-    onmsgesturedoubletap: ((this: Window, ev: Event) => any) | null;
-    onmsgestureend: ((this: Window, ev: Event) => any) | null;
-    onmsgesturehold: ((this: Window, ev: Event) => any) | null;
-    onmsgesturestart: ((this: Window, ev: Event) => any) | null;
-    onmsgesturetap: ((this: Window, ev: Event) => any) | null;
-    onmsinertiastart: ((this: Window, ev: Event) => any) | null;
-    onmspointercancel: ((this: Window, ev: Event) => any) | null;
-    onmspointerdown: ((this: Window, ev: Event) => any) | null;
-    onmspointerenter: ((this: Window, ev: Event) => any) | null;
-    onmspointerleave: ((this: Window, ev: Event) => any) | null;
-    onmspointermove: ((this: Window, ev: Event) => any) | null;
-    onmspointerout: ((this: Window, ev: Event) => any) | null;
-    onmspointerover: ((this: Window, ev: Event) => any) | null;
-    onmspointerup: ((this: Window, ev: Event) => any) | null;
-    onoffline: ((this: Window, ev: Event) => any) | null;
-    ononline: ((this: Window, ev: Event) => any) | null;
-    onorientationchange: ((this: Window, ev: Event) => any) | null;
-    onpagehide: ((this: Window, ev: PageTransitionEvent) => any) | null;
-    onpageshow: ((this: Window, ev: PageTransitionEvent) => any) | null;
-    onpause: ((this: Window, ev: Event) => any) | null;
-    onplay: ((this: Window, ev: Event) => any) | null;
-    onplaying: ((this: Window, ev: Event) => any) | null;
-    onpopstate: ((this: Window, ev: PopStateEvent) => any) | null;
-    onprogress: ((this: Window, ev: ProgressEvent) => any) | null;
-    onratechange: ((this: Window, ev: Event) => any) | null;
-    onreadystatechange: ((this: Window, ev: ProgressEvent) => any) | null;
-    onreset: ((this: Window, ev: Event) => any) | null;
-    onresize: ((this: Window, ev: UIEvent) => any) | null;
-    onscroll: ((this: Window, ev: UIEvent) => any) | null;
-    onseeked: ((this: Window, ev: Event) => any) | null;
-    onseeking: ((this: Window, ev: Event) => any) | null;
-    onselect: ((this: Window, ev: UIEvent) => any) | null;
-    onstalled: ((this: Window, ev: Event) => any) | null;
-    onstorage: ((this: Window, ev: StorageEvent) => any) | null;
-    onsubmit: ((this: Window, ev: Event) => any) | null;
-    onsuspend: ((this: Window, ev: Event) => any) | null;
-    ontimeupdate: ((this: Window, ev: Event) => any) | null;
-    ontouchcancel: (ev: TouchEvent) => any;
-    ontouchend: (ev: TouchEvent) => any;
-    ontouchmove: (ev: TouchEvent) => any;
-    ontouchstart: (ev: TouchEvent) => any;
-    onunload: ((this: Window, ev: Event) => any) | null;
-    onvolumechange: ((this: Window, ev: Event) => any) | null;
-    onvrdisplayactivate: ((this: Window, ev: Event) => any) | null;
-    onvrdisplayblur: ((this: Window, ev: Event) => any) | null;
-    onvrdisplayconnect: ((this: Window, ev: Event) => any) | null;
-    onvrdisplaydeactivate: ((this: Window, ev: Event) => any) | null;
-    onvrdisplaydisconnect: ((this: Window, ev: Event) => any) | null;
-    onvrdisplayfocus: ((this: Window, ev: Event) => any) | null;
-    onvrdisplaypointerrestricted: ((this: Window, ev: Event) => any) | null;
-    onvrdisplaypointerunrestricted: ((this: Window, ev: Event) => any) | null;
-    onvrdisplaypresentchange: ((this: Window, ev: Event) => any) | null;
-    onwaiting: ((this: Window, ev: Event) => any) | null;
-    opener: any;
-    readonly orientation: string | number;
-    readonly outerHeight: number;
-    readonly outerWidth: number;
-    readonly pageXOffset: number;
-    readonly pageYOffset: number;
-    readonly parent: Window;
-    readonly performance: Performance;
-    readonly personalbar: BarProp;
-    readonly screen: Screen;
-    readonly screenLeft: number;
-    readonly screenTop: number;
-    readonly screenX: number;
-    readonly screenY: number;
-    readonly scrollX: number;
-    readonly scrollY: number;
-    readonly scrollbars: BarProp;
-    readonly self: Window;
-    readonly speechSynthesis: SpeechSynthesis;
-    status: string;
-    readonly statusbar: BarProp;
-    readonly styleMedia: StyleMedia;
-    readonly toolbar: BarProp;
-    readonly top: Window;
-    readonly window: Window;
-    alert(message?: any): void;
-    blur(): void;
-    cancelAnimationFrame(handle: number): void;
-    captureEvents(): void;
-    close(): void;
-    confirm(message?: string): boolean;
-    createImageBitmap(image: HTMLImageElement | SVGImageElement | HTMLVideoElement | HTMLCanvasElement | ImageBitmap | ImageData | Blob, options?: ImageBitmapOptions): Promise<ImageBitmap>;
-    createImageBitmap(image: HTMLImageElement | SVGImageElement | HTMLVideoElement | HTMLCanvasElement | ImageBitmap | ImageData | Blob, sx: number, sy: number, sw: number, sh: number, options?: ImageBitmapOptions): Promise<ImageBitmap>;
-    departFocus(navigationReason: NavigationReason, origin: FocusNavigationOrigin): void;
-    focus(): void;
-    getComputedStyle(elt: Element, pseudoElt?: string | null): CSSStyleDeclaration;
-    getMatchedCSSRules(elt: Element, pseudoElt?: string | null): CSSRuleList;
-    getSelection(): Selection;
-    matchMedia(mediaQuery: string): MediaQueryList;
-    moveBy(x?: number, y?: number): void;
-    moveTo(x?: number, y?: number): void;
-    msWriteProfilerMark(profilerMarkName: string): void;
-    open(url?: string, target?: string, features?: string, replace?: boolean): Window | null;
-    postMessage(message: any, targetOrigin: string, transfer?: any[]): void;
-    print(): void;
-    prompt(message?: string, _default?: string): string | null;
-    releaseEvents(): void;
-    requestAnimationFrame(callback: FrameRequestCallback): number;
-    resizeBy(x?: number, y?: number): void;
-    resizeTo(x?: number, y?: number): void;
-    scroll(options?: ScrollToOptions): void;
-    scroll(x?: number, y?: number): void;
-    scrollBy(options?: ScrollToOptions): void;
-    scrollBy(x?: number, y?: number): void;
-    scrollTo(options?: ScrollToOptions): void;
-    scrollTo(x?: number, y?: number): void;
-    stop(): void;
-    webkitCancelAnimationFrame(handle: number): void;
-    webkitConvertPointFromNodeToPage(node: Node, pt: WebKitPoint): WebKitPoint;
-    webkitConvertPointFromPageToNode(node: Node, pt: WebKitPoint): WebKitPoint;
-    webkitRequestAnimationFrame(callback: FrameRequestCallback): number;
-    addEventListener<K extends keyof WindowEventMap>(type: K, listener: (this: Window, ev: WindowEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof WindowEventMap>(type: K, listener: (this: Window, ev: WindowEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var Window: {
-    prototype: Window;
-    new(): Window;
-};
-
-interface WindowBase64 {
-    atob(encodedString: string): string;
-    btoa(rawString: string): string;
-}
-
-interface WindowConsole {
-    readonly console: Console;
-}
-
-interface WindowEventHandlersEventMap {
-    "afterprint": Event;
-    "beforeprint": Event;
-    "beforeunload": BeforeUnloadEvent;
-    "hashchange": HashChangeEvent;
-    "message": MessageEvent;
-    "offline": Event;
-    "online": Event;
-    "pagehide": PageTransitionEvent;
-    "pageshow": PageTransitionEvent;
-    "popstate": PopStateEvent;
-    "storage": StorageEvent;
-    "unload": Event;
-}
-
-interface WindowEventHandlers {
-    onafterprint: ((this: WindowEventHandlers, ev: Event) => any) | null;
-    onbeforeprint: ((this: WindowEventHandlers, ev: Event) => any) | null;
-    onbeforeunload: ((this: WindowEventHandlers, ev: BeforeUnloadEvent) => any) | null;
-    onhashchange: ((this: WindowEventHandlers, ev: HashChangeEvent) => any) | null;
-    onmessage: ((this: WindowEventHandlers, ev: MessageEvent) => any) | null;
-    onoffline: ((this: WindowEventHandlers, ev: Event) => any) | null;
-    ononline: ((this: WindowEventHandlers, ev: Event) => any) | null;
-    onpagehide: ((this: WindowEventHandlers, ev: PageTransitionEvent) => any) | null;
-    onpageshow: ((this: WindowEventHandlers, ev: PageTransitionEvent) => any) | null;
-    onpopstate: ((this: WindowEventHandlers, ev: PopStateEvent) => any) | null;
-    onstorage: ((this: WindowEventHandlers, ev: StorageEvent) => any) | null;
-    onunload: ((this: WindowEventHandlers, ev: Event) => any) | null;
-    addEventListener<K extends keyof WindowEventHandlersEventMap>(type: K, listener: (this: WindowEventHandlers, ev: WindowEventHandlersEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof WindowEventHandlersEventMap>(type: K, listener: (this: WindowEventHandlers, ev: WindowEventHandlersEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-interface WindowLocalStorage {
-    readonly localStorage: Storage;
-}
-
-interface WindowSessionStorage {
-    readonly sessionStorage: Storage;
-}
-
-interface WindowTimers extends WindowTimersExtension {
-    clearInterval(handle?: number): void;
-    clearTimeout(handle?: number): void;
-    setInterval(handler: (...args: any[]) => void, timeout: number): number;
-    setInterval(handler: any, timeout?: any, ...args: any[]): number;
-    setTimeout(handler: (...args: any[]) => void, timeout: number): number;
-    setTimeout(handler: any, timeout?: any, ...args: any[]): number;
-}
-
-interface WindowTimersExtension {
-    clearImmediate(handle: number): void;
-    setImmediate(handler: (...args: any[]) => void): number;
-    setImmediate(handler: any, ...args: any[]): number;
-}
-
-interface WorkerEventMap extends AbstractWorkerEventMap {
-    "message": MessageEvent;
-}
-
-interface Worker extends EventTarget, AbstractWorker {
-    onmessage: ((this: Worker, ev: MessageEvent) => any) | null;
-    /** @deprecated */
-    postMessage(message: any, transfer?: any[]): void;
-    terminate(): void;
-    addEventListener<K extends keyof WorkerEventMap>(type: K, listener: (this: Worker, ev: WorkerEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof WorkerEventMap>(type: K, listener: (this: Worker, ev: WorkerEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var Worker: {
-    prototype: Worker;
-    new(stringUrl: string): Worker;
-};
-
-interface WritableStream {
-    readonly locked: boolean;
-    abort(reason?: any): Promise<void>;
-    getWriter(): WritableStreamDefaultWriter;
-}
-
-declare var WritableStream: {
-    prototype: WritableStream;
-    new(underlyingSink?: UnderlyingSink, strategy?: QueuingStrategy): WritableStream;
-};
-
-interface WritableStreamDefaultController {
-    error(error?: any): void;
-}
-
-declare var WritableStreamDefaultController: {
-    prototype: WritableStreamDefaultController;
-    new(): WritableStreamDefaultController;
-};
-
-interface WritableStreamDefaultWriter {
-    readonly closed: Promise<void>;
-    readonly desiredSize: number;
-    readonly ready: Promise<void>;
-    abort(reason?: any): Promise<void>;
-    close(): Promise<void>;
-    releaseLock(): void;
-    write(chunk?: any): Promise<any>;
-}
-
-declare var WritableStreamDefaultWriter: {
-    prototype: WritableStreamDefaultWriter;
-    new(): WritableStreamDefaultWriter;
-};
-
-interface XMLDocument extends Document {
-    addEventListener<K extends keyof DocumentEventMap>(type: K, listener: (this: XMLDocument, ev: DocumentEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof DocumentEventMap>(type: K, listener: (this: XMLDocument, ev: DocumentEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var XMLDocument: {
-    prototype: XMLDocument;
-    new(): XMLDocument;
-};
-
-interface XMLHttpRequestEventMap extends XMLHttpRequestEventTargetEventMap {
-    "readystatechange": Event;
-}
-
-interface XMLHttpRequest extends EventTarget, XMLHttpRequestEventTarget {
-    msCaching: string;
-    onreadystatechange: ((this: XMLHttpRequest, ev: Event) => any) | null;
-    readonly readyState: number;
-    readonly response: any;
-    readonly responseText: string;
-    responseType: XMLHttpRequestResponseType;
-    readonly responseURL: string;
-    readonly responseXML: Document | null;
-    readonly status: number;
-    readonly statusText: string;
-    timeout: number;
-    readonly upload: XMLHttpRequestUpload;
-    withCredentials: boolean;
-    abort(): void;
-    getAllResponseHeaders(): string;
-    getResponseHeader(header: string): string | null;
-    msCachingEnabled(): boolean;
-    open(method: string, url: string, async?: boolean, user?: string | null, password?: string | null): void;
-    overrideMimeType(mime: string): void;
-    send(data?: any): void;
-    setRequestHeader(header: string, value: string): void;
-    readonly DONE: number;
-    readonly HEADERS_RECEIVED: number;
-    readonly LOADING: number;
-    readonly OPENED: number;
-    readonly UNSENT: number;
-    addEventListener<K extends keyof XMLHttpRequestEventMap>(type: K, listener: (this: XMLHttpRequest, ev: XMLHttpRequestEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof XMLHttpRequestEventMap>(type: K, listener: (this: XMLHttpRequest, ev: XMLHttpRequestEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var XMLHttpRequest: {
-    prototype: XMLHttpRequest;
-    new(): XMLHttpRequest;
-    readonly DONE: number;
-    readonly HEADERS_RECEIVED: number;
-    readonly LOADING: number;
-    readonly OPENED: number;
-    readonly UNSENT: number;
-};
-
-interface XMLHttpRequestEventTargetEventMap {
-    "abort": Event;
-    "error": ErrorEvent;
-    "load": Event;
-    "loadend": ProgressEvent;
-    "loadstart": Event;
-    "progress": ProgressEvent;
-    "timeout": ProgressEvent;
-}
-
-interface XMLHttpRequestEventTarget {
-    onabort: ((this: XMLHttpRequest, ev: Event) => any) | null;
-    onerror: ((this: XMLHttpRequest, ev: ErrorEvent) => any) | null;
-    onload: ((this: XMLHttpRequest, ev: Event) => any) | null;
-    onloadend: ((this: XMLHttpRequest, ev: ProgressEvent) => any) | null;
-    onloadstart: ((this: XMLHttpRequest, ev: Event) => any) | null;
-    onprogress: ((this: XMLHttpRequest, ev: ProgressEvent) => any) | null;
-    ontimeout: ((this: XMLHttpRequest, ev: ProgressEvent) => any) | null;
-    addEventListener<K extends keyof XMLHttpRequestEventTargetEventMap>(type: K, listener: (this: XMLHttpRequestEventTarget, ev: XMLHttpRequestEventTargetEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof XMLHttpRequestEventTargetEventMap>(type: K, listener: (this: XMLHttpRequestEventTarget, ev: XMLHttpRequestEventTargetEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-interface XMLHttpRequestUpload extends EventTarget, XMLHttpRequestEventTarget {
-    addEventListener<K extends keyof XMLHttpRequestEventTargetEventMap>(type: K, listener: (this: XMLHttpRequestUpload, ev: XMLHttpRequestEventTargetEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof XMLHttpRequestEventTargetEventMap>(type: K, listener: (this: XMLHttpRequestUpload, ev: XMLHttpRequestEventTargetEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var XMLHttpRequestUpload: {
-    prototype: XMLHttpRequestUpload;
-    new(): XMLHttpRequestUpload;
-};
-
-interface XMLSerializer {
-    serializeToString(target: Node): string;
-}
-
-declare var XMLSerializer: {
-    prototype: XMLSerializer;
-    new(): XMLSerializer;
-};
-
-interface XPathEvaluator {
-    createExpression(expression: string, resolver: XPathNSResolver): XPathExpression;
-    createNSResolver(nodeResolver?: Node): XPathNSResolver;
-    evaluate(expression: string, contextNode: Node, resolver: XPathNSResolver | null, type: number, result: XPathResult | null): XPathResult;
-}
-
-declare var XPathEvaluator: {
-    prototype: XPathEvaluator;
-    new(): XPathEvaluator;
-};
-
-interface XPathExpression {
-    evaluate(contextNode: Node, type: number, result: XPathResult | null): XPathResult;
-}
-
-declare var XPathExpression: {
-    prototype: XPathExpression;
-    new(): XPathExpression;
-};
-
-interface XPathNSResolver {
-    lookupNamespaceURI(prefix: string): string;
-}
-
-declare var XPathNSResolver: {
-    prototype: XPathNSResolver;
-    new(): XPathNSResolver;
-};
-
-interface XPathResult {
-    readonly booleanValue: boolean;
-    readonly invalidIteratorState: boolean;
-    readonly numberValue: number;
-    readonly resultType: number;
-    readonly singleNodeValue: Node;
-    readonly snapshotLength: number;
-    readonly stringValue: string;
-    iterateNext(): Node;
-    snapshotItem(index: number): Node;
-    readonly ANY_TYPE: number;
-    readonly ANY_UNORDERED_NODE_TYPE: number;
-    readonly BOOLEAN_TYPE: number;
-    readonly FIRST_ORDERED_NODE_TYPE: number;
-    readonly NUMBER_TYPE: number;
-    readonly ORDERED_NODE_ITERATOR_TYPE: number;
-    readonly ORDERED_NODE_SNAPSHOT_TYPE: number;
-    readonly STRING_TYPE: number;
-    readonly UNORDERED_NODE_ITERATOR_TYPE: number;
-    readonly UNORDERED_NODE_SNAPSHOT_TYPE: number;
-}
-
-declare var XPathResult: {
-    prototype: XPathResult;
-    new(): XPathResult;
-    readonly ANY_TYPE: number;
-    readonly ANY_UNORDERED_NODE_TYPE: number;
-    readonly BOOLEAN_TYPE: number;
-    readonly FIRST_ORDERED_NODE_TYPE: number;
-    readonly NUMBER_TYPE: number;
-    readonly ORDERED_NODE_ITERATOR_TYPE: number;
-    readonly ORDERED_NODE_SNAPSHOT_TYPE: number;
-    readonly STRING_TYPE: number;
-    readonly UNORDERED_NODE_ITERATOR_TYPE: number;
-    readonly UNORDERED_NODE_SNAPSHOT_TYPE: number;
-};
-
-interface XSLTProcessor {
-    clearParameters(): void;
-    getParameter(namespaceURI: string, localName: string): any;
-    importStylesheet(style: Node): void;
-    removeParameter(namespaceURI: string, localName: string): void;
-    reset(): void;
-    setParameter(namespaceURI: string, localName: string, value: any): void;
-    transformToDocument(source: Node): Document;
-    transformToFragment(source: Node, document: Document): DocumentFragment;
-}
-
-declare var XSLTProcessor: {
-    prototype: XSLTProcessor;
-    new(): XSLTProcessor;
-};
-
-interface webkitRTCPeerConnection extends RTCPeerConnection {
-    addEventListener<K extends keyof RTCPeerConnectionEventMap>(type: K, listener: (this: webkitRTCPeerConnection, ev: RTCPeerConnectionEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-    removeEventListener<K extends keyof RTCPeerConnectionEventMap>(type: K, listener: (this: webkitRTCPeerConnection, ev: RTCPeerConnectionEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-}
-
-declare var webkitRTCPeerConnection: {
-    prototype: webkitRTCPeerConnection;
-    new(configuration: RTCConfiguration): webkitRTCPeerConnection;
-};
-
-declare type EventListenerOrEventListenerObject = EventListener | EventListenerObject;
-
-interface DecodeErrorCallback {
-    (error: DOMException): void;
-}
-
-interface DecodeSuccessCallback {
-    (decodedData: AudioBuffer): void;
-}
-
-interface ErrorEventHandler {
-    (event: Event | string, source?: string, fileno?: number, columnNumber?: number, error?: Error): void;
-}
-
-interface EventHandlerNonNull {
-    (event: Event): any;
-}
-
-interface ForEachCallback {
-    (keyId: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null, status: MediaKeyStatus): void;
-}
-
-interface FrameRequestCallback {
-    (time: number): void;
-}
-
-interface FunctionStringCallback {
-    (data: string): void;
-}
-
-interface IntersectionObserverCallback {
-    (entries: IntersectionObserverEntry[], observer: IntersectionObserver): void;
-}
-
-interface MSLaunchUriCallback {
-    (): void;
-}
-
-interface MediaQueryListListener {
-    (mql: MediaQueryList): void;
-}
-
-interface MutationCallback {
-    (mutations: MutationRecord[], observer: MutationObserver): void;
-}
-
-interface NavigatorUserMediaErrorCallback {
-    (error: MediaStreamError): void;
-}
-
-interface NavigatorUserMediaSuccessCallback {
-    (stream: MediaStream): void;
-}
-
-interface NotificationPermissionCallback {
-    (permission: NotificationPermission): void;
-}
-
-interface PositionCallback {
-    (position: Position): void;
-}
-
-interface PositionErrorCallback {
-    (error: PositionError): void;
-}
-
-interface RTCPeerConnectionErrorCallback {
-    (error: DOMError): void;
-}
-
-interface RTCSessionDescriptionCallback {
-    (sdp: RTCSessionDescription): void;
-}
-
-interface RTCStatsCallback {
-    (report: RTCStatsReport): void;
-}
-
-interface VoidFunction {
-    (): void;
-}
-
-interface WritableStreamChunkCallback {
-    (chunk: any, controller: WritableStreamDefaultController): void;
-}
-
-interface WritableStreamDefaultControllerCallback {
-    (controller: WritableStreamDefaultController): void;
-}
-
-interface WritableStreamErrorCallback {
-    (reason: string): void;
-}
-
-interface HTMLElementTagNameMap {
-    "a": HTMLAnchorElement;
-    "abbr": HTMLElement;
-    "acronym": HTMLElement;
-    "address": HTMLElement;
-    "applet": HTMLAppletElement;
-    "area": HTMLAreaElement;
-    "article": HTMLElement;
-    "aside": HTMLElement;
-    "audio": HTMLAudioElement;
-    "b": HTMLElement;
-    "base": HTMLBaseElement;
-    "basefont": HTMLBaseFontElement;
-    "bdo": HTMLElement;
-    "big": HTMLElement;
-    "blockquote": HTMLQuoteElement;
-    "body": HTMLBodyElement;
-    "br": HTMLBRElement;
-    "button": HTMLButtonElement;
-    "canvas": HTMLCanvasElement;
-    "caption": HTMLTableCaptionElement;
-    "center": HTMLElement;
-    "cite": HTMLElement;
-    "code": HTMLElement;
-    "col": HTMLTableColElement;
-    "colgroup": HTMLTableColElement;
-    "data": HTMLDataElement;
-    "datalist": HTMLDataListElement;
-    "dd": HTMLElement;
-    "del": HTMLModElement;
-    "dfn": HTMLElement;
-    "dir": HTMLDirectoryElement;
-    "div": HTMLDivElement;
-    "dl": HTMLDListElement;
-    "dt": HTMLElement;
-    "em": HTMLElement;
-    "embed": HTMLEmbedElement;
-    "fieldset": HTMLFieldSetElement;
-    "figcaption": HTMLElement;
-    "figure": HTMLElement;
-    "font": HTMLFontElement;
-    "footer": HTMLElement;
-    "form": HTMLFormElement;
-    "frame": HTMLFrameElement;
-    "frameset": HTMLFrameSetElement;
-    "h1": HTMLHeadingElement;
-    "h2": HTMLHeadingElement;
-    "h3": HTMLHeadingElement;
-    "h4": HTMLHeadingElement;
-    "h5": HTMLHeadingElement;
-    "h6": HTMLHeadingElement;
-    "head": HTMLHeadElement;
-    "header": HTMLElement;
-    "hgroup": HTMLElement;
-    "hr": HTMLHRElement;
-    "html": HTMLHtmlElement;
-    "i": HTMLElement;
-    "iframe": HTMLIFrameElement;
-    "img": HTMLImageElement;
-    "input": HTMLInputElement;
-    "ins": HTMLModElement;
-    "isindex": HTMLUnknownElement;
-    "kbd": HTMLElement;
-    "keygen": HTMLElement;
-    "label": HTMLLabelElement;
-    "legend": HTMLLegendElement;
-    "li": HTMLLIElement;
-    "link": HTMLLinkElement;
-    "listing": HTMLPreElement;
-    "map": HTMLMapElement;
-    "mark": HTMLElement;
-    "marquee": HTMLMarqueeElement;
-    "menu": HTMLMenuElement;
-    "meta": HTMLMetaElement;
-    "meter": HTMLMeterElement;
-    "nav": HTMLElement;
-    "nextid": HTMLUnknownElement;
-    "nobr": HTMLElement;
-    "noframes": HTMLElement;
-    "noscript": HTMLElement;
-    "object": HTMLObjectElement;
-    "ol": HTMLOListElement;
-    "optgroup": HTMLOptGroupElement;
-    "option": HTMLOptionElement;
-    "output": HTMLOutputElement;
-    "p": HTMLParagraphElement;
-    "param": HTMLParamElement;
-    "picture": HTMLPictureElement;
-    "plaintext": HTMLElement;
-    "pre": HTMLPreElement;
-    "progress": HTMLProgressElement;
-    "q": HTMLQuoteElement;
-    "rt": HTMLElement;
-    "ruby": HTMLElement;
-    "s": HTMLElement;
-    "samp": HTMLElement;
-    "script": HTMLScriptElement;
-    "section": HTMLElement;
-    "select": HTMLSelectElement;
-    "slot": HTMLSlotElement;
-    "small": HTMLElement;
-    "source": HTMLSourceElement;
-    "span": HTMLSpanElement;
-    "strike": HTMLElement;
-    "strong": HTMLElement;
-    "style": HTMLStyleElement;
-    "sub": HTMLElement;
-    "sup": HTMLElement;
-    "table": HTMLTableElement;
-    "tbody": HTMLTableSectionElement;
-    "td": HTMLTableDataCellElement;
-    "template": HTMLTemplateElement;
-    "textarea": HTMLTextAreaElement;
-    "tfoot": HTMLTableSectionElement;
-    "th": HTMLTableHeaderCellElement;
-    "thead": HTMLTableSectionElement;
-    "time": HTMLTimeElement;
-    "title": HTMLTitleElement;
-    "tr": HTMLTableRowElement;
-    "track": HTMLTrackElement;
-    "tt": HTMLElement;
-    "u": HTMLElement;
-    "ul": HTMLUListElement;
-    "var": HTMLElement;
-    "video": HTMLVideoElement;
-    "wbr": HTMLElement;
-    "xmp": HTMLPreElement;
-}
-
-interface SVGElementTagNameMap {
-    "circle": SVGCircleElement;
-    "clippath": SVGClipPathElement;
-    "defs": SVGDefsElement;
-    "desc": SVGDescElement;
-    "ellipse": SVGEllipseElement;
-    "feblend": SVGFEBlendElement;
-    "fecolormatrix": SVGFEColorMatrixElement;
-    "fecomponenttransfer": SVGFEComponentTransferElement;
-    "fecomposite": SVGFECompositeElement;
-    "feconvolvematrix": SVGFEConvolveMatrixElement;
-    "fediffuselighting": SVGFEDiffuseLightingElement;
-    "fedisplacementmap": SVGFEDisplacementMapElement;
-    "fedistantlight": SVGFEDistantLightElement;
-    "feflood": SVGFEFloodElement;
-    "fefunca": SVGFEFuncAElement;
-    "fefuncb": SVGFEFuncBElement;
-    "fefuncg": SVGFEFuncGElement;
-    "fefuncr": SVGFEFuncRElement;
-    "fegaussianblur": SVGFEGaussianBlurElement;
-    "feimage": SVGFEImageElement;
-    "femerge": SVGFEMergeElement;
-    "femergenode": SVGFEMergeNodeElement;
-    "femorphology": SVGFEMorphologyElement;
-    "feoffset": SVGFEOffsetElement;
-    "fepointlight": SVGFEPointLightElement;
-    "fespecularlighting": SVGFESpecularLightingElement;
-    "fespotlight": SVGFESpotLightElement;
-    "fetile": SVGFETileElement;
-    "feturbulence": SVGFETurbulenceElement;
-    "filter": SVGFilterElement;
-    "foreignobject": SVGForeignObjectElement;
-    "g": SVGGElement;
-    "image": SVGImageElement;
-    "line": SVGLineElement;
-    "lineargradient": SVGLinearGradientElement;
-    "marker": SVGMarkerElement;
-    "mask": SVGMaskElement;
-    "metadata": SVGMetadataElement;
-    "path": SVGPathElement;
-    "pattern": SVGPatternElement;
-    "polygon": SVGPolygonElement;
-    "polyline": SVGPolylineElement;
-    "radialgradient": SVGRadialGradientElement;
-    "rect": SVGRectElement;
-    "stop": SVGStopElement;
-    "svg": SVGSVGElement;
-    "switch": SVGSwitchElement;
-    "symbol": SVGSymbolElement;
-    "text": SVGTextElement;
-    "textpath": SVGTextPathElement;
-    "tspan": SVGTSpanElement;
-    "use": SVGUseElement;
-    "view": SVGViewElement;
-}
-
-/** @deprecated Directly use HTMLElementTagNameMap or SVGElementTagNameMap as appropriate, instead. */
-interface ElementTagNameMap extends HTMLElementTagNameMap, SVGElementTagNameMap { }
-
-declare var Audio: {
-    new(src?: string): HTMLAudioElement;
-};
-declare var Image: {
-    new(width?: number, height?: number): HTMLImageElement;
-};
-declare var Option: {
-    new(text?: string, value?: string, defaultSelected?: boolean, selected?: boolean): HTMLOptionElement;
-};
-declare var Blob: typeof Blob;
-declare var URL: typeof URL;
-declare var URLSearchParams: typeof URLSearchParams;
-declare var applicationCache: ApplicationCache;
-declare var caches: CacheStorage;
-declare var clientInformation: Navigator;
-declare var closed: boolean;
-declare var crypto: Crypto;
-declare var customElements: CustomElementRegistry;
-declare var defaultStatus: string;
-declare var devicePixelRatio: number;
-declare var doNotTrack: string;
-declare var document: Document;
-declare var event: Event | undefined;
-declare var external: External;
-declare var frameElement: Element;
-declare var frames: Window;
-declare var history: History;
-declare var innerHeight: number;
-declare var innerWidth: number;
-declare var isSecureContext: boolean;
-declare var length: number;
-declare var location: Location;
-declare var locationbar: BarProp;
-declare var menubar: BarProp;
-declare var msContentScript: ExtensionScriptApis;
-declare var msCredentials: MSCredentials;
-declare const name: never;
-declare var navigator: Navigator;
-declare var offscreenBuffering: string | boolean;
-declare var onabort: ((this: Window, ev: UIEvent) => any) | null;
-declare var onafterprint: ((this: Window, ev: Event) => any) | null;
-declare var onbeforeprint: ((this: Window, ev: Event) => any) | null;
-declare var onbeforeunload: ((this: Window, ev: BeforeUnloadEvent) => any) | null;
-declare var onblur: ((this: Window, ev: FocusEvent) => any) | null;
-declare var oncanplay: ((this: Window, ev: Event) => any) | null;
-declare var oncanplaythrough: ((this: Window, ev: Event) => any) | null;
-declare var onchange: ((this: Window, ev: Event) => any) | null;
-declare var onclick: ((this: Window, ev: MouseEvent) => any) | null;
-declare var oncompassneedscalibration: ((this: Window, ev: Event) => any) | null;
-declare var oncontextmenu: ((this: Window, ev: PointerEvent) => any) | null;
-declare var ondblclick: ((this: Window, ev: MouseEvent) => any) | null;
-declare var ondevicelight: ((this: Window, ev: DeviceLightEvent) => any) | null;
-declare var ondevicemotion: ((this: Window, ev: DeviceMotionEvent) => any) | null;
-declare var ondeviceorientation: ((this: Window, ev: DeviceOrientationEvent) => any) | null;
-declare var ondrag: ((this: Window, ev: DragEvent) => any) | null;
-declare var ondragend: ((this: Window, ev: DragEvent) => any) | null;
-declare var ondragenter: ((this: Window, ev: DragEvent) => any) | null;
-declare var ondragleave: ((this: Window, ev: DragEvent) => any) | null;
-declare var ondragover: ((this: Window, ev: DragEvent) => any) | null;
-declare var ondragstart: ((this: Window, ev: DragEvent) => any) | null;
-declare var ondrop: ((this: Window, ev: DragEvent) => any) | null;
-declare var ondurationchange: ((this: Window, ev: Event) => any) | null;
-declare var onemptied: ((this: Window, ev: Event) => any) | null;
-declare var onended: ((this: Window, ev: Event) => any) | null;
-declare var onerror: ErrorEventHandler;
-declare var onfocus: ((this: Window, ev: FocusEvent) => any) | null;
-declare var onhashchange: ((this: Window, ev: HashChangeEvent) => any) | null;
-declare var oninput: ((this: Window, ev: Event) => any) | null;
-declare var oninvalid: ((this: Window, ev: Event) => any) | null;
-declare var onkeydown: ((this: Window, ev: KeyboardEvent) => any) | null;
-declare var onkeypress: ((this: Window, ev: KeyboardEvent) => any) | null;
-declare var onkeyup: ((this: Window, ev: KeyboardEvent) => any) | null;
-declare var onload: ((this: Window, ev: Event) => any) | null;
-declare var onloadeddata: ((this: Window, ev: Event) => any) | null;
-declare var onloadedmetadata: ((this: Window, ev: Event) => any) | null;
-declare var onloadstart: ((this: Window, ev: Event) => any) | null;
-declare var onmessage: ((this: Window, ev: MessageEvent) => any) | null;
-declare var onmousedown: ((this: Window, ev: MouseEvent) => any) | null;
-declare var onmouseenter: ((this: Window, ev: MouseEvent) => any) | null;
-declare var onmouseleave: ((this: Window, ev: MouseEvent) => any) | null;
-declare var onmousemove: ((this: Window, ev: MouseEvent) => any) | null;
-declare var onmouseout: ((this: Window, ev: MouseEvent) => any) | null;
-declare var onmouseover: ((this: Window, ev: MouseEvent) => any) | null;
-declare var onmouseup: ((this: Window, ev: MouseEvent) => any) | null;
-declare var onmousewheel: ((this: Window, ev: WheelEvent) => any) | null;
-declare var onmsgesturechange: ((this: Window, ev: Event) => any) | null;
-declare var onmsgesturedoubletap: ((this: Window, ev: Event) => any) | null;
-declare var onmsgestureend: ((this: Window, ev: Event) => any) | null;
-declare var onmsgesturehold: ((this: Window, ev: Event) => any) | null;
-declare var onmsgesturestart: ((this: Window, ev: Event) => any) | null;
-declare var onmsgesturetap: ((this: Window, ev: Event) => any) | null;
-declare var onmsinertiastart: ((this: Window, ev: Event) => any) | null;
-declare var onmspointercancel: ((this: Window, ev: Event) => any) | null;
-declare var onmspointerdown: ((this: Window, ev: Event) => any) | null;
-declare var onmspointerenter: ((this: Window, ev: Event) => any) | null;
-declare var onmspointerleave: ((this: Window, ev: Event) => any) | null;
-declare var onmspointermove: ((this: Window, ev: Event) => any) | null;
-declare var onmspointerout: ((this: Window, ev: Event) => any) | null;
-declare var onmspointerover: ((this: Window, ev: Event) => any) | null;
-declare var onmspointerup: ((this: Window, ev: Event) => any) | null;
-declare var onoffline: ((this: Window, ev: Event) => any) | null;
-declare var ononline: ((this: Window, ev: Event) => any) | null;
-declare var onorientationchange: ((this: Window, ev: Event) => any) | null;
-declare var onpagehide: ((this: Window, ev: PageTransitionEvent) => any) | null;
-declare var onpageshow: ((this: Window, ev: PageTransitionEvent) => any) | null;
-declare var onpause: ((this: Window, ev: Event) => any) | null;
-declare var onplay: ((this: Window, ev: Event) => any) | null;
-declare var onplaying: ((this: Window, ev: Event) => any) | null;
-declare var onpopstate: ((this: Window, ev: PopStateEvent) => any) | null;
-declare var onprogress: ((this: Window, ev: ProgressEvent) => any) | null;
-declare var onratechange: ((this: Window, ev: Event) => any) | null;
-declare var onreadystatechange: ((this: Window, ev: ProgressEvent) => any) | null;
-declare var onreset: ((this: Window, ev: Event) => any) | null;
-declare var onresize: ((this: Window, ev: UIEvent) => any) | null;
-declare var onscroll: ((this: Window, ev: UIEvent) => any) | null;
-declare var onseeked: ((this: Window, ev: Event) => any) | null;
-declare var onseeking: ((this: Window, ev: Event) => any) | null;
-declare var onselect: ((this: Window, ev: UIEvent) => any) | null;
-declare var onstalled: ((this: Window, ev: Event) => any) | null;
-declare var onstorage: ((this: Window, ev: StorageEvent) => any) | null;
-declare var onsubmit: ((this: Window, ev: Event) => any) | null;
-declare var onsuspend: ((this: Window, ev: Event) => any) | null;
-declare var ontimeupdate: ((this: Window, ev: Event) => any) | null;
-declare var ontouchcancel: (ev: TouchEvent) => any;
-declare var ontouchend: (ev: TouchEvent) => any;
-declare var ontouchmove: (ev: TouchEvent) => any;
-declare var ontouchstart: (ev: TouchEvent) => any;
-declare var onunload: ((this: Window, ev: Event) => any) | null;
-declare var onvolumechange: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplayactivate: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplayblur: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplayconnect: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplaydeactivate: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplaydisconnect: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplayfocus: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplaypointerrestricted: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplaypointerunrestricted: ((this: Window, ev: Event) => any) | null;
-declare var onvrdisplaypresentchange: ((this: Window, ev: Event) => any) | null;
-declare var onwaiting: ((this: Window, ev: Event) => any) | null;
-declare var opener: any;
-declare var orientation: string | number;
-declare var outerHeight: number;
-declare var outerWidth: number;
-declare var pageXOffset: number;
-declare var pageYOffset: number;
-declare var parent: Window;
-declare var performance: Performance;
-declare var personalbar: BarProp;
-declare var screen: Screen;
-declare var screenLeft: number;
-declare var screenTop: number;
-declare var screenX: number;
-declare var screenY: number;
-declare var scrollX: number;
-declare var scrollY: number;
-declare var scrollbars: BarProp;
-declare var self: Window;
-declare var speechSynthesis: SpeechSynthesis;
-declare var status: string;
-declare var statusbar: BarProp;
-declare var styleMedia: StyleMedia;
-declare var toolbar: BarProp;
-declare var top: Window;
-declare var window: Window;
-declare function alert(message?: any): void;
-declare function blur(): void;
-declare function cancelAnimationFrame(handle: number): void;
-declare function captureEvents(): void;
-declare function close(): void;
-declare function confirm(message?: string): boolean;
-declare function createImageBitmap(image: HTMLImageElement | SVGImageElement | HTMLVideoElement | HTMLCanvasElement | ImageBitmap | ImageData | Blob, options?: ImageBitmapOptions): Promise<ImageBitmap>;
-declare function createImageBitmap(image: HTMLImageElement | SVGImageElement | HTMLVideoElement | HTMLCanvasElement | ImageBitmap | ImageData | Blob, sx: number, sy: number, sw: number, sh: number, options?: ImageBitmapOptions): Promise<ImageBitmap>;
-declare function departFocus(navigationReason: NavigationReason, origin: FocusNavigationOrigin): void;
-declare function focus(): void;
-declare function getComputedStyle(elt: Element, pseudoElt?: string | null): CSSStyleDeclaration;
-declare function getMatchedCSSRules(elt: Element, pseudoElt?: string | null): CSSRuleList;
-declare function getSelection(): Selection;
-declare function matchMedia(mediaQuery: string): MediaQueryList;
-declare function moveBy(x?: number, y?: number): void;
-declare function moveTo(x?: number, y?: number): void;
-declare function msWriteProfilerMark(profilerMarkName: string): void;
-declare function open(url?: string, target?: string, features?: string, replace?: boolean): Window | null;
-declare function postMessage(message: any, targetOrigin: string, transfer?: any[]): void;
-declare function print(): void;
-declare function prompt(message?: string, _default?: string): string | null;
-declare function releaseEvents(): void;
-declare function requestAnimationFrame(callback: FrameRequestCallback): number;
-declare function resizeBy(x?: number, y?: number): void;
-declare function resizeTo(x?: number, y?: number): void;
-declare function scroll(options?: ScrollToOptions): void;
-declare function scroll(x?: number, y?: number): void;
-declare function scrollBy(options?: ScrollToOptions): void;
-declare function scrollBy(x?: number, y?: number): void;
-declare function scrollTo(options?: ScrollToOptions): void;
-declare function scrollTo(x?: number, y?: number): void;
-declare function stop(): void;
-declare function webkitCancelAnimationFrame(handle: number): void;
-declare function webkitConvertPointFromNodeToPage(node: Node, pt: WebKitPoint): WebKitPoint;
-declare function webkitConvertPointFromPageToNode(node: Node, pt: WebKitPoint): WebKitPoint;
-declare function webkitRequestAnimationFrame(callback: FrameRequestCallback): number;
-declare function toString(): string;
-declare function dispatchEvent(evt: Event): boolean;
-declare function clearInterval(handle?: number): void;
-declare function clearTimeout(handle?: number): void;
-declare function setInterval(handler: (...args: any[]) => void, timeout: number): number;
-declare function setInterval(handler: any, timeout?: any, ...args: any[]): number;
-declare function setTimeout(handler: (...args: any[]) => void, timeout: number): number;
-declare function setTimeout(handler: any, timeout?: any, ...args: any[]): number;
-declare function clearImmediate(handle: number): void;
-declare function setImmediate(handler: (...args: any[]) => void): number;
-declare function setImmediate(handler: any, ...args: any[]): number;
-declare var sessionStorage: Storage;
-declare var localStorage: Storage;
-declare var console: Console;
-declare var onpointercancel: ((this: Window, ev: PointerEvent) => any) | null;
-declare var onpointerdown: ((this: Window, ev: PointerEvent) => any) | null;
-declare var onpointerenter: ((this: Window, ev: PointerEvent) => any) | null;
-declare var onpointerleave: ((this: Window, ev: PointerEvent) => any) | null;
-declare var onpointermove: ((this: Window, ev: PointerEvent) => any) | null;
-declare var onpointerout: ((this: Window, ev: PointerEvent) => any) | null;
-declare var onpointerover: ((this: Window, ev: PointerEvent) => any) | null;
-declare var onpointerup: ((this: Window, ev: PointerEvent) => any) | null;
-declare var onwheel: ((this: Window, ev: WheelEvent) => any) | null;
-declare var indexedDB: IDBFactory;
-declare function atob(encodedString: string): string;
-declare function btoa(rawString: string): string;
-declare function fetch(input?: Request | string, init?: RequestInit): Promise<Response>;
-declare function addEventListener<K extends keyof WindowEventMap>(type: K, listener: (this: Window, ev: WindowEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
-declare function addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
-declare function removeEventListener<K extends keyof WindowEventMap>(type: K, listener: (this: Window, ev: WindowEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
-declare function removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-type ScrollBehavior = "auto" | "instant" | "smooth";
-type ScrollLogicalPosition = "start" | "center" | "end" | "nearest";
-type MouseWheelEvent = WheelEvent;
-type ScrollRestoration = "auto" | "manual";
-type FormDataEntryValue = string | File;
-type InsertPosition = "beforebegin" | "afterbegin" | "beforeend" | "afterend";
-type HeadersInit = Headers | string[][] | { [key: string]: string };
-type OrientationLockType = "any" | "natural" | "portrait" | "landscape" | "portrait-primary" | "portrait-secondary" | "landscape-primary"| "landscape-secondary";
-type IDBValidKey = number | string | Date | IDBArrayKey;
-type AlgorithmIdentifier = string | Algorithm;
-type MutationRecordType = "attributes" | "characterData" | "childList";
-type AAGUID = string;
-type BodyInit = any;
-type ByteString = string;
-type ConstrainBoolean = boolean | ConstrainBooleanParameters;
-type ConstrainDOMString = string | string[] | ConstrainDOMStringParameters;
-type ConstrainDouble = number | ConstrainDoubleRange;
-type ConstrainLong = number | ConstrainLongRange;
-type CryptoOperationData = ArrayBufferView;
-type GLbitfield = number;
-type GLboolean = boolean;
-type GLbyte = number;
-type GLclampf = number;
-type GLenum = number;
-type GLfloat = number;
-type GLint = number;
-type GLintptr = number;
-type GLshort = number;
-type GLsizei = number;
-type GLsizeiptr = number;
-type GLubyte = number;
-type GLuint = number;
-type GLushort = number;
-type IDBKeyPath = string;
-type MSInboundPayload = MSVideoRecvPayload | MSAudioRecvPayload;
-type MSLocalClientEvent = MSLocalClientEventBase | MSAudioLocalClientEvent;
-type MSOutboundPayload = MSVideoSendPayload | MSAudioSendPayload;
-type RTCIceGatherCandidate = RTCIceCandidateDictionary | RTCIceCandidateComplete;
-type RTCTransport = RTCDtlsTransport | RTCSrtpSdesTransport;
-type RequestInfo = Request | string;
-type USVString = string;
-type payloadtype = number;
-type BufferSource = ArrayBuffer | ArrayBufferView;
-type ClientTypes = "window" | "worker" | "sharedworker" | "all";
-type AppendMode = "segments" | "sequence";
-type AudioContextLatencyCategory = "balanced" | "interactive" | "playback";
-type AudioContextState = "suspended" | "running" | "closed";
-type BinaryType = "blob" | "arraybuffer";
-type BiquadFilterType = "lowpass" | "highpass" | "bandpass" | "lowshelf" | "highshelf" | "peaking" | "notch" | "allpass";
-type CanPlayTypeResult = "" | "maybe" | "probably";
-type CanvasFillRule = "nonzero" | "evenodd";
-type ChannelCountMode = "max" | "clamped-max" | "explicit";
-type ChannelInterpretation = "speakers" | "discrete";
-type DisplayCaptureSurfaceType = "monitor" | "window" | "application" | "browser";
-type DistanceModelType = "linear" | "inverse" | "exponential";
-type DocumentReadyState = "loading" | "interactive" | "complete";
-type EndOfStreamError = "network" | "decode";
-type ExpandGranularity = "character" | "word" | "sentence" | "textedit";
-type GamepadHand = "" | "left" | "right";
-type GamepadHapticActuatorType = "vibration";
-type GamepadInputEmulationType = "mouse" | "keyboard" | "gamepad";
-type GamepadMappingType = "" | "standard";
-type IDBCursorDirection = "next" | "nextunique" | "prev" | "prevunique";
-type IDBRequestReadyState = "pending" | "done";
-type IDBTransactionMode = "readonly" | "readwrite" | "versionchange";
-type KeyFormat = "raw" | "spki" | "pkcs8" | "jwk";
-type KeyType = "public" | "private" | "secret";
-type KeyUsage = "encrypt" | "decrypt" | "sign" | "verify" | "deriveKey" | "deriveBits" | "wrapKey" | "unwrapKey";
-type ListeningState = "inactive" | "active" | "disambiguation";
-type MSCredentialType = "FIDO_2_0";
-type MSIceAddrType = "os" | "stun" | "turn" | "peer-derived";
-type MSIceType = "failed" | "direct" | "relay";
-type MSStatsType = "description" | "localclientevent" | "inbound-network" | "outbound-network" | "inbound-payload" | "outbound-payload" | "transportdiagnostics";
-type MSTransportType = "Embedded" | "USB" | "NFC" | "BT";
-type MSWebViewPermissionState = "unknown" | "defer" | "allow" | "deny";
-type MSWebViewPermissionType = "geolocation" | "unlimitedIndexedDBQuota" | "media" | "pointerlock" | "webnotifications";
-type MediaDeviceKind = "audioinput" | "audiooutput" | "videoinput";
-type MediaKeyMessageType = "license-request" | "license-renewal" | "license-release" | "individualization-request";
-type MediaKeySessionType = "temporary" | "persistent-license" | "persistent-release-message";
-type MediaKeyStatus = "usable" | "expired" | "output-downscaled" | "output-not-allowed" | "status-pending" | "internal-error";
-type MediaKeysRequirement = "required" | "optional" | "not-allowed";
-type MediaStreamTrackState = "live" | "ended";
-type NavigationReason = "up" | "down" | "left" | "right";
-type NavigationType = "navigate" | "reload" | "back_forward" | "prerender";
-type NotificationDirection = "auto" | "ltr" | "rtl";
-type NotificationPermission = "default" | "denied" | "granted";
-type OscillatorType = "sine" | "square" | "sawtooth" | "triangle" | "custom";
-type OverSampleType = "none" | "2x" | "4x";
-type PanningModelType = "equalpower" | "HRTF";
-type PaymentComplete = "success" | "fail" | "unknown";
-type PaymentShippingType = "shipping" | "delivery" | "pickup";
-type PushEncryptionKeyName = "p256dh" | "auth";
-type PushPermissionState = "granted" | "denied" | "prompt";
-type RTCBundlePolicy = "balanced" | "max-compat" | "max-bundle";
-type RTCDegradationPreference = "maintain-framerate" | "maintain-resolution" | "balanced";
-type RTCDtlsRole = "auto" | "client" | "server";
-type RTCDtlsTransportState = "new" | "connecting" | "connected" | "closed";
-type RTCIceCandidateType = "host" | "srflx" | "prflx" | "relay";
-type RTCIceComponent = "RTP" | "RTCP";
-type RTCIceConnectionState = "new" | "checking" | "connected" | "completed" | "failed" | "disconnected" | "closed";
-type RTCIceGatherPolicy = "all" | "nohost" | "relay";
-type RTCIceGathererState = "new" | "gathering" | "complete";
-type RTCIceGatheringState = "new" | "gathering" | "complete";
-type RTCIceProtocol = "udp" | "tcp";
-type RTCIceRole = "controlling" | "controlled";
-type RTCIceTcpCandidateType = "active" | "passive" | "so";
-type RTCIceTransportPolicy = "none" | "relay" | "all";
-type RTCIceTransportState = "new" | "checking" | "connected" | "completed" | "disconnected" | "closed";
-type RTCSdpType = "offer" | "pranswer" | "answer";
-type RTCSignalingState = "stable" | "have-local-offer" | "have-remote-offer" | "have-local-pranswer" | "have-remote-pranswer" | "closed";
-type RTCStatsIceCandidatePairState = "frozen" | "waiting" | "inprogress" | "failed" | "succeeded" | "cancelled";
-type RTCStatsIceCandidateType = "host" | "serverreflexive" | "peerreflexive" | "relayed";
-type RTCStatsType = "inboundrtp" | "outboundrtp" | "session" | "datachannel" | "track" | "transport" | "candidatepair" | "localcandidate" | "remotecandidate";
-type ReadyState = "closed" | "open" | "ended";
-type ReferrerPolicy = "" | "no-referrer" | "no-referrer-when-downgrade" | "origin-only" | "origin-when-cross-origin" | "unsafe-url";
-type RequestCache = "default" | "no-store" | "reload" | "no-cache" | "force-cache";
-type RequestCredentials = "omit" | "same-origin" | "include";
-type RequestDestination = "" | "document" | "sharedworker" | "subresource" | "unknown" | "worker";
-type RequestMode = "navigate" | "same-origin" | "no-cors" | "cors";
-type RequestRedirect = "follow" | "error" | "manual";
-type RequestType = "" | "audio" | "font" | "image" | "script" | "style" | "track" | "video";
-type ResponseType = "basic" | "cors" | "default" | "error" | "opaque" | "opaqueredirect";
-type ScopedCredentialType = "ScopedCred";
-type ServiceWorkerState = "installing" | "installed" | "activating" | "activated" | "redundant";
-type TextTrackKind = "subtitles" | "captions" | "descriptions" | "chapters" | "metadata";
-type TextTrackMode = "disabled" | "hidden" | "showing";
-type Transport = "usb" | "nfc" | "ble";
-type VRDisplayEventReason = "mounted" | "navigation" | "requested" | "unmounted";
-type VREye = "left" | "right";
-type VideoFacingModeEnum = "user" | "environment" | "left" | "right";
-type VisibilityState = "hidden" | "visible" | "prerender" | "unloaded";
-type XMLHttpRequestResponseType = "" | "arraybuffer" | "blob" | "document" | "json" | "text";
-
-
-/////////////////////////////
-/// WorkerGlobalScope APIs
-/////////////////////////////
-// These are only available in a Web Worker
-declare function importScripts(...urls: string[]): void;
-
-
-
-
-/////////////////////////////
-/// Windows Script Host APIS
-/////////////////////////////
-
-
-interface ActiveXObject {
-    new (s: string): any;
-}
-declare var ActiveXObject: ActiveXObject;
-
-interface ITextWriter {
-    Write(s: string): void;
-    WriteLine(s: string): void;
-    Close(): void;
-}
-
-interface TextStreamBase {
-    /**
-     * The column number of the current character position in an input stream.
-     */
-    Column: number;
-
-    /**
-     * The current line number in an input stream.
-     */
-    Line: number;
-
-    /**
-     * Closes a text stream.
-     * It is not necessary to close standard streams; they close automatically when the process ends. If
-     * you close a standard stream, be aware that any other pointers to that standard stream become invalid.
-     */
-    Close(): void;
-}
-
-interface TextStreamWriter extends TextStreamBase {
-    /**
-     * Sends a string to an output stream.
-     */
-    Write(s: string): void;
-
-    /**
-     * Sends a specified number of blank lines (newline characters) to an output stream.
-     */
-    WriteBlankLines(intLines: number): void;
-
-    /**
-     * Sends a string followed by a newline character to an output stream.
-     */
-    WriteLine(s: string): void;
-}
-
-interface TextStreamReader extends TextStreamBase {
-    /**
-     * Returns a specified number of characters from an input stream, starting at the current pointer position.
-     * Does not return until the ENTER key is pressed.
-     * Can only be used on a stream in reading mode; causes an error in writing or appending mode.
-     */
-    Read(characters: number): string;
-
-    /**
-     * Returns all characters from an input stream.
-     * Can only be used on a stream in reading mode; causes an error in writing or appending mode.
-     */
-    ReadAll(): string;
-
-    /**
-     * Returns an entire line from an input stream.
-     * Although this method extracts the newline character, it does not add it to the returned string.
-     * Can only be used on a stream in reading mode; causes an error in writing or appending mode.
-     */
-    ReadLine(): string;
-
-    /**
-     * Skips a specified number of characters when reading from an input text stream.
-     * Can only be used on a stream in reading mode; causes an error in writing or appending mode.
-     * @param characters Positive number of characters to skip forward. (Backward skipping is not supported.)
-     */
-    Skip(characters: number): void;
-
-    /**
-     * Skips the next line when reading from an input text stream.
-     * Can only be used on a stream in reading mode, not writing or appending mode.
-     */
-    SkipLine(): void;
-
-    /**
-     * Indicates whether the stream pointer position is at the end of a line.
-     */
-    AtEndOfLine: boolean;
-
-    /**
-     * Indicates whether the stream pointer position is at the end of a stream.
-     */
-    AtEndOfStream: boolean;
-}
-
-declare var WScript: {
-    /**
-     * Outputs text to either a message box (under WScript.exe) or the command console window followed by
-     * a newline (under CScript.exe).
-     */
-    Echo(s: any): void;
-
-    /**
-     * Exposes the write-only error output stream for the current script.
-     * Can be accessed only while using CScript.exe.
-     */
-    StdErr: TextStreamWriter;
-
-    /**
-     * Exposes the write-only output stream for the current script.
-     * Can be accessed only while using CScript.exe.
-     */
-    StdOut: TextStreamWriter;
-    Arguments: { length: number; Item(n: number): string; };
-
-    /**
-     *  The full path of the currently running script.
-     */
-    ScriptFullName: string;
-
-    /**
-     * Forces the script to stop immediately, with an optional exit code.
-     */
-    Quit(exitCode?: number): number;
-
-    /**
-     * The Windows Script Host build version number.
-     */
-    BuildVersion: number;
-
-    /**
-     * Fully qualified path of the host executable.
-     */
-    FullName: string;
-
-    /**
-     * Gets/sets the script mode - interactive(true) or batch(false).
-     */
-    Interactive: boolean;
-
-    /**
-     * The name of the host executable (WScript.exe or CScript.exe).
-     */
-    Name: string;
-
-    /**
-     * Path of the directory containing the host executable.
-     */
-    Path: string;
-
-    /**
-     * The filename of the currently running script.
-     */
-    ScriptName: string;
-
-    /**
-     * Exposes the read-only input stream for the current script.
-     * Can be accessed only while using CScript.exe.
-     */
-    StdIn: TextStreamReader;
-
-    /**
-     * Windows Script Host version
-     */
-    Version: string;
-
-    /**
-     * Connects a COM object's event sources to functions named with a given prefix, in the form prefix_event.
-     */
-    ConnectObject(objEventSource: any, strPrefix: string): void;
-
-    /**
-     * Creates a COM object.
-     * @param strProgiID
-     * @param strPrefix Function names in the form prefix_event will be bound to this object's COM events.
-     */
-    CreateObject(strProgID: string, strPrefix?: string): any;
-
-    /**
-     * Disconnects a COM object from its event sources.
-     */
-    DisconnectObject(obj: any): void;
-
-    /**
-     * Retrieves an existing object with the specified ProgID from memory, or creates a new one from a file.
-     * @param strPathname Fully qualified path to the file containing the object persisted to disk.
-     *                       For objects in memory, pass a zero-length string.
-     * @param strProgID
-     * @param strPrefix Function names in the form prefix_event will be bound to this object's COM events.
-     */
-    GetObject(strPathname: string, strProgID?: string, strPrefix?: string): any;
-
-    /**
-     * Suspends script execution for a specified length of time, then continues execution.
-     * @param intTime Interval (in milliseconds) to suspend script execution.
-     */
-    Sleep(intTime: number): void;
-};
-
-/**
- * WSH is an alias for WScript under Windows Script Host
- */
-declare var WSH: typeof WScript;
-
-/**
- * Represents an Automation SAFEARRAY
- */
-declare class SafeArray<T = any> {
-    private constructor();
-    private SafeArray_typekey: SafeArray<T>;
-}
-
-/**
- * Allows enumerating over a COM collection, which may not have indexed item access.
- */
-interface Enumerator<T = any> {
-    /**
-     * Returns true if the current item is the last one in the collection, or the collection is empty,
-     * or the current item is undefined.
-     */
-    atEnd(): boolean;
-
-    /**
-     * Returns the current item in the collection
-     */
-    item(): T;
-
-    /**
-     * Resets the current item in the collection to the first item. If there are no items in the collection,
-     * the current item is set to undefined.
-     */
-    moveFirst(): void;
-
-    /**
-     * Moves the current item to the next item in the collection. If the enumerator is at the end of
-     * the collection or the collection is empty, the current item is set to undefined.
-     */
-    moveNext(): void;
-}
-
-interface EnumeratorConstructor {
-    new <T = any>(safearray: SafeArray<T>): Enumerator<T>;
-    new <T = any>(collection: { Item(index: any): T }): Enumerator<T>;
-    new <T = any>(collection: any): Enumerator<T>;
-}
-
-declare var Enumerator: EnumeratorConstructor;
-
-/**
- * Enables reading from a COM safe array, which might have an alternate lower bound, or multiple dimensions.
- */
-interface VBArray<T = any> {
-    /**
-     * Returns the number of dimensions (1-based).
-     */
-    dimensions(): number;
-
-    /**
-     * Takes an index for each dimension in the array, and returns the item at the corresponding location.
-     */
-    getItem(dimension1Index: number, ...dimensionNIndexes: number[]): T;
-
-    /**
-     * Returns the smallest available index for a given dimension.
-     * @param dimension 1-based dimension (defaults to 1)
-     */
-    lbound(dimension?: number): number;
-
-    /**
-     * Returns the largest available index for a given dimension.
-     * @param dimension 1-based dimension (defaults to 1)
-     */
-    ubound(dimension?: number): number;
-
-    /**
-     * Returns a Javascript array with all the elements in the VBArray. If there are multiple dimensions,
-     * each successive dimension is appended to the end of the array.
-     * Example: [[1,2,3],[4,5,6]] becomes [1,2,3,4,5,6]
-     */
-    toArray(): T[];
-}
-
-interface VBArrayConstructor {
-    new <T = any>(safeArray: SafeArray<T>): VBArray<T>;
-}
-
-declare var VBArray: VBArrayConstructor;
-
-/**
- * Automation date (VT_DATE)
- */
-declare class VarDate {
-    private constructor();
-    private VarDate_typekey: VarDate;
-}
-
-interface DateConstructor {
-    new (vd: VarDate): Date;
-}
-
-interface Date {
-    getVarDate: () => VarDate;
-}
-
-
-/// <reference path="lib.dom.d.ts" />
-
-interface DOMTokenList {
-    [Symbol.iterator](): IterableIterator<string>;
-}
-
-interface Headers {
-    [Symbol.iterator](): IterableIterator<[string, string]>;
-    /**
-     * Returns an iterator allowing to go through all key/value pairs contained in this object.
-     */
-    entries(): IterableIterator<[string, string]>;
-    /**
-     * Returns an iterator allowing to go through all keys f the key/value pairs contained in this object.
-     */
-    keys(): IterableIterator<string>;
-    /**
-     * Returns an iterator allowing to go through all values of the key/value pairs contained in this object.
-     */
-    values(): IterableIterator<string>;
-}
-
-interface NodeList {
-    /**
-     * Returns an array of key, value pairs for every entry in the list
-     */
-    entries(): IterableIterator<[number, Node]>;
-    /**
-     * Performs the specified action for each node in an list.
-     * @param callbackfn  A function that accepts up to three arguments. forEach calls the callbackfn function one time for each element in the list.
-     * @param thisArg  An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
-     */
-    forEach(callbackfn: (value: Node, index: number, listObj: NodeList) => void, thisArg?: any): void;
-    /**
-     * Returns an list of keys in the list
-     */
-    keys(): IterableIterator<number>;
-
-    /**
-     * Returns an list of values in the list
-     */
-    values(): IterableIterator<Node>;
-
-
-    [Symbol.iterator](): IterableIterator<Node>;
-}
-
-interface NodeListOf<TNode extends Node> {
-
-    /**
-     * Returns an array of key, value pairs for every entry in the list
-     */
-    entries(): IterableIterator<[number, TNode]>;
-
-    /**
-     * Performs the specified action for each node in an list.
-     * @param callbackfn  A function that accepts up to three arguments. forEach calls the callbackfn function one time for each element in the list.
-     * @param thisArg  An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
-     */
-    forEach(callbackfn: (value: TNode, index: number, listObj: NodeListOf<TNode>) => void, thisArg?: any): void;
-    /**
-     * Returns an list of keys in the list
-     */
-    keys(): IterableIterator<number>;
-    /**
-     * Returns an list of values in the list
-     */
-    values(): IterableIterator<TNode>;
-
-    [Symbol.iterator](): IterableIterator<TNode>;
-}
-
-interface HTMLCollectionBase {
-    [Symbol.iterator](): IterableIterator<Element>;
-}
-
-interface HTMLCollectionOf<T extends Element> {
-    [Symbol.iterator](): IterableIterator<T>;
-}
-
-interface FormData {
-    /**
-     * Returns an array of key, value pairs for every entry in the list
-     */
-    entries(): IterableIterator<[string, string | File]>;
-    /**
-     * Returns a list of keys in the list
-     */
-    keys(): IterableIterator<string>;
-    /**
-     * Returns a list of values in the list
-     */
-    values(): IterableIterator<string | File>;
-
-    [Symbol.iterator](): IterableIterator<string | File>;
-}
-
-interface URLSearchParams {
-    /**
-     * Returns an array of key, value pairs for every entry in the search params
-     */
-    entries(): IterableIterator<[string, string]>;
-    /**
-     * Returns a list of keys in the search params
-     */
-    keys(): IterableIterator<string>;
-    /**
-     * Returns a list of values in the search params
-     */
-    values(): IterableIterator<string>;
-    /**
-     * iterate over key/value pairs
-     */
-    [Symbol.iterator](): IterableIterator<[string, string]>;
-}
+/// <reference lib="esnext" />
+/// <reference lib="dom" />
+/// <reference lib="webworker.importscripts" />
+/// <reference lib="scripthost" />
+/// <reference lib="dom.iterable" />
\ No newline at end of file
diff --git a/lib/lib.webworker.d.ts b/lib/lib.webworker.d.ts
index 68a80021d50..0c13cc8a555 100644
--- a/lib/lib.webworker.d.ts
+++ b/lib/lib.webworker.d.ts
@@ -31,6 +31,10 @@ interface Algorithm {
     name: string;
 }
 
+interface BlobPropertyBag {
+    type?: string;
+}
+
 interface CacheQueryOptions {
     cacheName?: string;
     ignoreMethod?: boolean;
@@ -39,7 +43,6 @@ interface CacheQueryOptions {
 }
 
 interface ClientQueryOptions {
-    includeReserved?: boolean;
     includeUncontrolled?: boolean;
     type?: ClientTypes;
 }
@@ -50,6 +53,56 @@ interface CloseEventInit extends EventInit {
     wasClean?: boolean;
 }
 
+interface DOMMatrix2DInit {
+    a?: number;
+    b?: number;
+    c?: number;
+    d?: number;
+    e?: number;
+    f?: number;
+    m11?: number;
+    m12?: number;
+    m21?: number;
+    m22?: number;
+    m41?: number;
+    m42?: number;
+}
+
+interface DOMMatrixInit extends DOMMatrix2DInit {
+    is2D?: boolean;
+    m13?: number;
+    m14?: number;
+    m23?: number;
+    m24?: number;
+    m31?: number;
+    m32?: number;
+    m33?: number;
+    m34?: number;
+    m43?: number;
+    m44?: number;
+}
+
+interface DOMPointInit {
+    w?: number;
+    x?: number;
+    y?: number;
+    z?: number;
+}
+
+interface DOMQuadInit {
+    p1?: DOMPointInit;
+    p2?: DOMPointInit;
+    p3?: DOMPointInit;
+    p4?: DOMPointInit;
+}
+
+interface DOMRectInit {
+    height?: number;
+    width?: number;
+    x?: number;
+    y?: number;
+}
+
 interface ErrorEventInit extends EventInit {
     colno?: number;
     error?: any;
@@ -61,7 +114,7 @@ interface ErrorEventInit extends EventInit {
 interface EventInit {
     bubbles?: boolean;
     cancelable?: boolean;
-    scoped?: boolean;
+    composed?: boolean;
 }
 
 interface EventListenerOptions {
@@ -75,17 +128,22 @@ interface ExtendableMessageEventInit extends ExtendableEventInit {
     data?: any;
     lastEventId?: string;
     origin?: string;
-    ports?: MessagePort[] | null;
-    source?: Client | ServiceWorker | MessagePort | null;
+    ports?: MessagePort[];
+    source?: Client | ServiceWorker | MessagePort;
 }
 
 interface FetchEventInit extends ExtendableEventInit {
     clientId?: string;
+    preloadResponse: Promise<any>;
     request: Request;
-    reservedClientId?: string;
+    resultingClientId?: string;
     targetClientId?: string;
 }
 
+interface FilePropertyBag extends BlobPropertyBag {
+    lastModified?: number;
+}
+
 interface GetNotificationOptions {
     tag?: string;
 }
@@ -100,6 +158,11 @@ interface IDBObjectStoreParameters {
     keyPath?: string | string[];
 }
 
+interface IDBVersionChangeEventInit extends EventInit {
+    newVersion?: number | null;
+    oldVersion?: number;
+}
+
 interface KeyAlgorithm {
     name: string;
 }
@@ -113,22 +176,42 @@ interface MessageEventInit extends EventInit {
     source?: object | null;
 }
 
+interface NavigationPreloadState {
+    enabled?: boolean;
+    headerValue?: string;
+}
+
+interface NotificationAction {
+    action: string;
+    icon?: string;
+    title: string;
+}
+
 interface NotificationEventInit extends ExtendableEventInit {
     action?: string;
     notification: Notification;
 }
 
 interface NotificationOptions {
+    actions?: NotificationAction[];
+    badge?: string;
     body?: string;
     data?: any;
     dir?: NotificationDirection;
     icon?: string;
+    image?: string;
     lang?: string;
+    renotify?: boolean;
+    requireInteraction?: boolean;
+    silent?: boolean;
     tag?: string;
+    timestamp?: number;
+    vibrate?: VibratePattern;
 }
 
-interface ObjectURLOptions {
-    oneTimeOnly?: boolean;
+interface PerformanceObserverInit {
+    buffered?: boolean;
+    entryTypes: string[];
 }
 
 interface ProgressEventInit extends EventInit {
@@ -137,8 +220,13 @@ interface ProgressEventInit extends EventInit {
     total?: number;
 }
 
+interface PromiseRejectionEventInit extends EventInit {
+    promise: Promise<any>;
+    reason?: any;
+}
+
 interface PushEventInit extends ExtendableEventInit {
-    data?: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | string | null;
+    data?: PushMessageDataInit;
 }
 
 interface PushSubscriptionChangeInit extends ExtendableEventInit {
@@ -146,13 +234,25 @@ interface PushSubscriptionChangeInit extends ExtendableEventInit {
     oldSubscription?: PushSubscription;
 }
 
+interface PushSubscriptionJSON {
+    endpoint?: string;
+    expirationTime?: number | null;
+    keys?: Record<string, string>;
+}
+
 interface PushSubscriptionOptionsInit {
-    applicationServerKey?: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | string | null;
+    applicationServerKey?: BufferSource | string;
     userVisibleOnly?: boolean;
 }
 
+interface RegistrationOptions {
+    scope?: string;
+    type?: WorkerType;
+    updateViaCache?: ServiceWorkerUpdateViaCache;
+}
+
 interface RequestInit {
-    body?: Blob | Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | FormData | string | null;
+    body?: BodyInit | null;
     cache?: RequestCache;
     credentials?: RequestCredentials;
     headers?: HeadersInit;
@@ -163,7 +263,7 @@ interface RequestInit {
     redirect?: RequestRedirect;
     referrer?: string;
     referrerPolicy?: ReferrerPolicy;
-    signal?: object;
+    signal?: object | null;
     window?: any;
 }
 
@@ -173,11 +273,25 @@ interface ResponseInit {
     statusText?: string;
 }
 
+interface StorageEstimate {
+    quota?: number;
+    usage?: number;
+}
+
 interface SyncEventInit extends ExtendableEventInit {
     lastChance?: boolean;
     tag: string;
 }
 
+interface TextDecodeOptions {
+    stream?: boolean;
+}
+
+interface TextDecoderOptions {
+    fatal?: boolean;
+    ignoreBOM?: boolean;
+}
+
 interface EventListener {
     (evt: Event): void;
 }
@@ -194,40 +308,27 @@ interface AbstractWorker {
     removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
 }
 
-interface AudioBuffer {
-    readonly duration: number;
-    readonly length: number;
-    readonly numberOfChannels: number;
-    readonly sampleRate: number;
-    copyFromChannel(destination: Float32Array, channelNumber: number, startInChannel?: number): void;
-    copyToChannel(source: Float32Array, channelNumber: number, startInChannel?: number): void;
-    getChannelData(channel: number): Float32Array;
+interface AesCfbParams extends Algorithm {
+    iv: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer;
 }
 
-declare var AudioBuffer: {
-    prototype: AudioBuffer;
-    new(): AudioBuffer;
-};
+interface AesCmacParams extends Algorithm {
+    length: number;
+}
 
 interface Blob {
     readonly size: number;
     readonly type: string;
-    msClose(): void;
-    msDetachStream(): any;
     slice(start?: number, end?: number, contentType?: string): Blob;
 }
 
 declare var Blob: {
     prototype: Blob;
-    new (blobParts?: any[], options?: BlobPropertyBag): Blob;
+    new(blobParts?: BlobPart[], options?: BlobPropertyBag): Blob;
 };
 
-interface BlobPropertyBag {
-    endings?: string;
-    type?: string;
-}
-
 interface Body {
+    readonly body: ReadableStream | null;
     readonly bodyUsed: boolean;
     arrayBuffer(): Promise<ArrayBuffer>;
     blob(): Promise<Blob>;
@@ -236,14 +337,50 @@ interface Body {
     text(): Promise<string>;
 }
 
+interface BroadcastChannelEventMap {
+    "message": MessageEvent;
+    "messageerror": MessageEvent;
+}
+
+interface BroadcastChannel extends EventTarget {
+    /**
+     * Returns the channel name (as passed to the constructor).
+     */
+    readonly name: string;
+    onmessage: ((this: BroadcastChannel, ev: MessageEvent) => any) | null;
+    onmessageerror: ((this: BroadcastChannel, ev: MessageEvent) => any) | null;
+    /**
+     * Closes the BroadcastChannel object, opening it up to garbage collection.
+     */
+    close(): void;
+    /**
+     * Sends the given message to other BroadcastChannel objects set up for this channel. Messages can be structured objects, e.g. nested objects and arrays.
+     */
+    postMessage(message: any): void;
+    addEventListener<K extends keyof BroadcastChannelEventMap>(type: K, listener: (this: BroadcastChannel, ev: BroadcastChannelEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
+    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
+    removeEventListener<K extends keyof BroadcastChannelEventMap>(type: K, listener: (this: BroadcastChannel, ev: BroadcastChannelEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
+    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
+}
+
+declare var BroadcastChannel: {
+    prototype: BroadcastChannel;
+    new(name: string): BroadcastChannel;
+};
+
+interface BroadcastChannelEventMap {
+    message: MessageEvent;
+    messageerror: MessageEvent;
+}
+
 interface Cache {
-    add(request: Request | string): Promise<void>;
-    addAll(requests: (Request | string)[]): Promise<void>;
-    delete(request: Request | string, options?: CacheQueryOptions): Promise<boolean>;
-    keys(request?: Request | string, options?: CacheQueryOptions): Promise<Request[]>;
-    match(request: Request | string, options?: CacheQueryOptions): Promise<Response>;
-    matchAll(request?: Request | string, options?: CacheQueryOptions): Promise<Response[]>;
-    put(request: Request | string, response: Response): Promise<void>;
+    add(request: RequestInfo): Promise<void>;
+    addAll(requests: RequestInfo[]): Promise<void>;
+    delete(request: RequestInfo, options?: CacheQueryOptions): Promise<boolean>;
+    keys(request?: RequestInfo, options?: CacheQueryOptions): Promise<ReadonlyArray<Request>>;
+    match(request: RequestInfo, options?: CacheQueryOptions): Promise<Response | undefined>;
+    matchAll(request?: RequestInfo, options?: CacheQueryOptions): Promise<ReadonlyArray<Response>>;
+    put(request: RequestInfo, response: Response): Promise<void>;
 }
 
 declare var Cache: {
@@ -255,7 +392,7 @@ interface CacheStorage {
     delete(cacheName: string): Promise<boolean>;
     has(cacheName: string): Promise<boolean>;
     keys(): Promise<string[]>;
-    match(request: Request | string, options?: CacheQueryOptions): Promise<any>;
+    match(request: RequestInfo, options?: CacheQueryOptions): Promise<Response | undefined>;
     open(cacheName: string): Promise<Cache>;
 }
 
@@ -266,7 +403,6 @@ declare var CacheStorage: {
 
 interface Client {
     readonly id: string;
-    readonly reserved: boolean;
     readonly type: ClientTypes;
     readonly url: string;
     postMessage(message: any, transfer?: any[]): void;
@@ -280,7 +416,7 @@ declare var Client: {
 interface Clients {
     claim(): Promise<void>;
     get(id: string): Promise<any>;
-    matchAll(options?: ClientQueryOptions): Promise<Client[]>;
+    matchAll(options?: ClientQueryOptions): Promise<ReadonlyArray<Client>>;
     openWindow(url: string): Promise<WindowClient | null>;
 }
 
@@ -302,6 +438,15 @@ declare var CloseEvent: {
     new(type: string, eventInitDict?: CloseEventInit): CloseEvent;
 };
 
+interface ConcatParams extends Algorithm {
+    algorithmId: Uint8Array;
+    hash?: string | Algorithm;
+    partyUInfo: Uint8Array;
+    partyVInfo: Uint8Array;
+    privateInfo?: Uint8Array;
+    publicInfo?: Uint8Array;
+}
+
 interface Console {
     memory: any;
     assert(condition?: boolean, message?: string, ...data: any[]): void;
@@ -337,21 +482,6 @@ declare var Console: {
     new(): Console;
 };
 
-interface Coordinates {
-    readonly accuracy: number;
-    readonly altitude: number | null;
-    readonly altitudeAccuracy: number | null;
-    readonly heading: number | null;
-    readonly latitude: number;
-    readonly longitude: number;
-    readonly speed: number | null;
-}
-
-declare var Coordinates: {
-    prototype: Coordinates;
-    new(): Coordinates;
-};
-
 interface CryptoKey {
     readonly algorithm: KeyAlgorithm;
     readonly extractable: boolean;
@@ -364,21 +494,10 @@ declare var CryptoKey: {
     new(): CryptoKey;
 };
 
-interface DOMError {
-    readonly name: string;
-    toString(): string;
-}
-
-declare var DOMError: {
-    prototype: DOMError;
-    new(): DOMError;
-};
-
 interface DOMException {
     readonly code: number;
     readonly message: string;
     readonly name: string;
-    toString(): string;
     readonly ABORT_ERR: number;
     readonly DATA_CLONE_ERR: number;
     readonly DOMSTRING_SIZE_ERR: number;
@@ -396,10 +515,8 @@ interface DOMException {
     readonly NOT_SUPPORTED_ERR: number;
     readonly NO_DATA_ALLOWED_ERR: number;
     readonly NO_MODIFICATION_ALLOWED_ERR: number;
-    readonly PARSE_ERR: number;
     readonly QUOTA_EXCEEDED_ERR: number;
     readonly SECURITY_ERR: number;
-    readonly SERIALIZE_ERR: number;
     readonly SYNTAX_ERR: number;
     readonly TIMEOUT_ERR: number;
     readonly TYPE_MISMATCH_ERR: number;
@@ -428,10 +545,8 @@ declare var DOMException: {
     readonly NOT_SUPPORTED_ERR: number;
     readonly NO_DATA_ALLOWED_ERR: number;
     readonly NO_MODIFICATION_ALLOWED_ERR: number;
-    readonly PARSE_ERR: number;
     readonly QUOTA_EXCEEDED_ERR: number;
     readonly SECURITY_ERR: number;
-    readonly SERIALIZE_ERR: number;
     readonly SYNTAX_ERR: number;
     readonly TIMEOUT_ERR: number;
     readonly TYPE_MISMATCH_ERR: number;
@@ -440,9 +555,189 @@ declare var DOMException: {
     readonly WRONG_DOCUMENT_ERR: number;
 };
 
+interface DOMMatrix extends DOMMatrixReadOnly {
+    a: number;
+    b: number;
+    c: number;
+    d: number;
+    e: number;
+    f: number;
+    m11: number;
+    m12: number;
+    m13: number;
+    m14: number;
+    m21: number;
+    m22: number;
+    m23: number;
+    m24: number;
+    m31: number;
+    m32: number;
+    m33: number;
+    m34: number;
+    m41: number;
+    m42: number;
+    m43: number;
+    m44: number;
+    invertSelf(): DOMMatrix;
+    multiplySelf(other?: DOMMatrixInit): DOMMatrix;
+    preMultiplySelf(other?: DOMMatrixInit): DOMMatrix;
+    rotateAxisAngleSelf(x?: number, y?: number, z?: number, angle?: number): DOMMatrix;
+    rotateFromVectorSelf(x?: number, y?: number): DOMMatrix;
+    rotateSelf(rotX?: number, rotY?: number, rotZ?: number): DOMMatrix;
+    scale3dSelf(scale?: number, originX?: number, originY?: number, originZ?: number): DOMMatrix;
+    scaleSelf(scaleX?: number, scaleY?: number, scaleZ?: number, originX?: number, originY?: number, originZ?: number): DOMMatrix;
+    skewXSelf(sx?: number): DOMMatrix;
+    skewYSelf(sy?: number): DOMMatrix;
+    translateSelf(tx?: number, ty?: number, tz?: number): DOMMatrix;
+}
+
+declare var DOMMatrix: {
+    prototype: DOMMatrix;
+    new(init?: string | number[]): DOMMatrix;
+    fromFloat32Array(array32: Float32Array): DOMMatrix;
+    fromFloat64Array(array64: Float64Array): DOMMatrix;
+    fromMatrix(other?: DOMMatrixInit): DOMMatrix;
+};
+
+interface DOMMatrixReadOnly {
+    readonly a: number;
+    readonly b: number;
+    readonly c: number;
+    readonly d: number;
+    readonly e: number;
+    readonly f: number;
+    readonly is2D: boolean;
+    readonly isIdentity: boolean;
+    readonly m11: number;
+    readonly m12: number;
+    readonly m13: number;
+    readonly m14: number;
+    readonly m21: number;
+    readonly m22: number;
+    readonly m23: number;
+    readonly m24: number;
+    readonly m31: number;
+    readonly m32: number;
+    readonly m33: number;
+    readonly m34: number;
+    readonly m41: number;
+    readonly m42: number;
+    readonly m43: number;
+    readonly m44: number;
+    flipX(): DOMMatrix;
+    flipY(): DOMMatrix;
+    inverse(): DOMMatrix;
+    multiply(other?: DOMMatrixInit): DOMMatrix;
+    rotate(rotX?: number, rotY?: number, rotZ?: number): DOMMatrix;
+    rotateAxisAngle(x?: number, y?: number, z?: number, angle?: number): DOMMatrix;
+    rotateFromVector(x?: number, y?: number): DOMMatrix;
+    scale(scaleX?: number, scaleY?: number, scaleZ?: number, originX?: number, originY?: number, originZ?: number): DOMMatrix;
+    scale3d(scale?: number, originX?: number, originY?: number, originZ?: number): DOMMatrix;
+    skewX(sx?: number): DOMMatrix;
+    skewY(sy?: number): DOMMatrix;
+    toFloat32Array(): Float32Array;
+    toFloat64Array(): Float64Array;
+    toJSON(): any;
+    transformPoint(point?: DOMPointInit): DOMPoint;
+    translate(tx?: number, ty?: number, tz?: number): DOMMatrix;
+}
+
+declare var DOMMatrixReadOnly: {
+    prototype: DOMMatrixReadOnly;
+    new(init?: string | number[]): DOMMatrixReadOnly;
+    fromFloat32Array(array32: Float32Array): DOMMatrixReadOnly;
+    fromFloat64Array(array64: Float64Array): DOMMatrixReadOnly;
+    fromMatrix(other?: DOMMatrixInit): DOMMatrixReadOnly;
+};
+
+interface DOMPoint extends DOMPointReadOnly {
+    w: number;
+    x: number;
+    y: number;
+    z: number;
+}
+
+declare var DOMPoint: {
+    prototype: DOMPoint;
+    new(x?: number, y?: number, z?: number, w?: number): DOMPoint;
+    fromPoint(other?: DOMPointInit): DOMPoint;
+};
+
+interface DOMPointReadOnly {
+    readonly w: number;
+    readonly x: number;
+    readonly y: number;
+    readonly z: number;
+    matrixTransform(matrix?: DOMMatrixInit): DOMPoint;
+    toJSON(): any;
+}
+
+declare var DOMPointReadOnly: {
+    prototype: DOMPointReadOnly;
+    new(x?: number, y?: number, z?: number, w?: number): DOMPointReadOnly;
+    fromPoint(other?: DOMPointInit): DOMPointReadOnly;
+};
+
+interface DOMQuad {
+    readonly p1: DOMPoint;
+    readonly p2: DOMPoint;
+    readonly p3: DOMPoint;
+    readonly p4: DOMPoint;
+    getBounds(): DOMRect;
+    toJSON(): any;
+}
+
+declare var DOMQuad: {
+    prototype: DOMQuad;
+    new(p1?: DOMPointInit, p2?: DOMPointInit, p3?: DOMPointInit, p4?: DOMPointInit): DOMQuad;
+    fromQuad(other?: DOMQuadInit): DOMQuad;
+    fromRect(other?: DOMRectInit): DOMQuad;
+};
+
+interface DOMRect extends DOMRectReadOnly {
+    height: number;
+    width: number;
+    x: number;
+    y: number;
+}
+
+declare var DOMRect: {
+    prototype: DOMRect;
+    new(x?: number, y?: number, width?: number, height?: number): DOMRect;
+    fromRect(other?: DOMRectInit): DOMRect;
+};
+
+interface DOMRectReadOnly {
+    readonly bottom: number;
+    readonly height: number;
+    readonly left: number;
+    readonly right: number;
+    readonly top: number;
+    readonly width: number;
+    readonly x: number;
+    readonly y: number;
+    toJSON(): any;
+}
+
+declare var DOMRectReadOnly: {
+    prototype: DOMRectReadOnly;
+    new(x?: number, y?: number, width?: number, height?: number): DOMRectReadOnly;
+    fromRect(other?: DOMRectInit): DOMRectReadOnly;
+};
+
 interface DOMStringList {
+    /**
+     * Returns the number of strings in strings.
+     */
     readonly length: number;
-    contains(str: string): boolean;
+    /**
+     * Returns true if strings contains string, and false
+     * otherwise.
+     */
+    contains(string: string): boolean;
+    /**
+     * Returns the string with index index from strings.
+     */
     item(index: number): string | null;
     [index: number]: string;
 }
@@ -471,6 +766,25 @@ declare var DedicatedWorkerGlobalScope: {
     new(): DedicatedWorkerGlobalScope;
 };
 
+interface DhImportKeyParams extends Algorithm {
+    generator: Uint8Array;
+    prime: Uint8Array;
+}
+
+interface DhKeyAlgorithm extends KeyAlgorithm {
+    generator: Uint8Array;
+    prime: Uint8Array;
+}
+
+interface DhKeyDeriveParams extends Algorithm {
+    public: CryptoKey;
+}
+
+interface DhKeyGenParams extends Algorithm {
+    generator: Uint8Array;
+    prime: Uint8Array;
+}
+
 interface ErrorEvent extends Event {
     readonly colno: number;
     readonly error: any;
@@ -489,12 +803,12 @@ interface Event {
     readonly bubbles: boolean;
     cancelBubble: boolean;
     readonly cancelable: boolean;
+    readonly composed: boolean;
     readonly currentTarget: EventTarget | null;
     readonly defaultPrevented: boolean;
     readonly eventPhase: number;
     readonly isTrusted: boolean;
     returnValue: boolean;
-    readonly scoped: boolean;
     readonly srcElement: object | null;
     readonly target: EventTarget | null;
     readonly timeStamp: number;
@@ -523,6 +837,28 @@ interface EventListenerObject {
     handleEvent(evt: Event): void;
 }
 
+interface EventSource extends EventTarget {
+    readonly CLOSED: number;
+    readonly CONNECTING: number;
+    readonly OPEN: number;
+    onerror: (evt: MessageEvent) => any;
+    onmessage: (evt: MessageEvent) => any;
+    onopen: (evt: MessageEvent) => any;
+    readonly readyState: number;
+    readonly url: string;
+    readonly withCredentials: boolean;
+    close(): void;
+}
+
+declare var EventSource: {
+    prototype: EventSource;
+    new(url: string, eventSourceInitDict?: EventSourceInit): EventSource;
+};
+
+interface EventSourceInit {
+    readonly withCredentials: boolean;
+}
+
 interface EventTarget {
     addEventListener(type: string, listener: EventListenerOrEventListenerObject | null, options?: boolean | AddEventListenerOptions): void;
     dispatchEvent(evt: Event): boolean;
@@ -547,7 +883,7 @@ interface ExtendableMessageEvent extends ExtendableEvent {
     readonly data: any;
     readonly lastEventId: string;
     readonly origin: string;
-    readonly ports: ReadonlyArray<MessagePort> | null;
+    readonly ports: ReadonlyArray<MessagePort>;
     readonly source: Client | ServiceWorker | MessagePort | null;
 }
 
@@ -558,8 +894,9 @@ declare var ExtendableMessageEvent: {
 
 interface FetchEvent extends ExtendableEvent {
     readonly clientId: string;
+    readonly preloadResponse: Promise<any>;
     readonly request: Request;
-    readonly reservedClientId: string;
+    readonly resultingClientId: string;
     readonly targetClientId: string;
     respondWith(r: Promise<Response>): void;
 }
@@ -571,15 +908,12 @@ declare var FetchEvent: {
 
 interface File extends Blob {
     readonly lastModified: number;
-    /** @deprecated */
-    readonly lastModifiedDate: Date;
     readonly name: string;
-    readonly webkitRelativePath: string;
 }
 
 declare var File: {
     prototype: File;
-    new (parts: (ArrayBuffer | ArrayBufferView | Blob | string)[], filename: string, properties?: FilePropertyBag): File;
+    new(fileBits: BlobPart[], fileName: string, options?: FilePropertyBag): File;
 };
 
 interface FileList {
@@ -593,10 +927,6 @@ declare var FileList: {
     new(): FileList;
 };
 
-interface FilePropertyBag extends BlobPropertyBag {
-    lastModified?: number;
-}
-
 interface FileReaderEventMap {
     "abort": ProgressEvent;
     "error": ProgressEvent;
@@ -608,14 +938,14 @@ interface FileReaderEventMap {
 
 interface FileReader extends EventTarget {
     readonly error: DOMException | null;
-    onabort: ((this: FileReader, ev: FileReaderProgressEvent) => any) | null;
-    onerror: ((this: FileReader, ev: FileReaderProgressEvent) => any) | null;
-    onload: ((this: FileReader, ev: FileReaderProgressEvent) => any) | null;
-    onloadend: ((this: FileReader, ev: FileReaderProgressEvent) => any) | null;
-    onloadstart: ((this: FileReader, ev: FileReaderProgressEvent) => any) | null;
-    onprogress: ((this: FileReader, ev: FileReaderProgressEvent) => any) | null;
+    onabort: ((this: FileReader, ev: ProgressEvent) => any) | null;
+    onerror: ((this: FileReader, ev: ProgressEvent) => any) | null;
+    onload: ((this: FileReader, ev: ProgressEvent) => any) | null;
+    onloadend: ((this: FileReader, ev: ProgressEvent) => any) | null;
+    onloadstart: ((this: FileReader, ev: ProgressEvent) => any) | null;
+    onprogress: ((this: FileReader, ev: ProgressEvent) => any) | null;
     readonly readyState: number;
-    readonly result: any;
+    readonly result: string | ArrayBuffer | null;
     abort(): void;
     readAsArrayBuffer(blob: Blob): void;
     readAsBinaryString(blob: Blob): void;
@@ -638,15 +968,11 @@ declare var FileReader: {
     readonly LOADING: number;
 };
 
-interface FileReaderProgressEvent extends ProgressEvent {
-    readonly target: FileReader | null;
-}
-
 interface FileReaderSync {
-    readAsArrayBuffer(blob: Blob): any;
-    readAsBinaryString(blob: Blob): void;
+    readAsArrayBuffer(blob: Blob): ArrayBuffer;
+    readAsBinaryString(blob: Blob): string;
     readAsDataURL(blob: Blob): string;
-    readAsText(blob: Blob, encoding?: string): string;
+    readAsText(blob: Blob, label?: string): string;
 }
 
 declare var FileReaderSync: {
@@ -661,12 +987,12 @@ interface FormData {
     getAll(name: string): FormDataEntryValue[];
     has(name: string): boolean;
     set(name: string, value: string | Blob, fileName?: string): void;
+    forEach(callbackfn: (value: FormDataEntryValue, key: string, parent: FormData) => void, thisArg?: any): void;
 }
 
 declare var FormData: {
     prototype: FormData;
-    new(): FormData;
-    new(form: object): FormData;
+    new(form?: object): FormData;
 };
 
 interface GlobalFetch {
@@ -676,10 +1002,10 @@ interface GlobalFetch {
 interface Headers {
     append(name: string, value: string): void;
     delete(name: string): void;
-    forEach(callback: Function, thisArg?: any): void;
     get(name: string): string | null;
     has(name: string): boolean;
     set(name: string, value: string): void;
+    forEach(callbackfn: (value: string, key: string, parent: Headers) => void, thisArg?: any): void;
 }
 
 declare var Headers: {
@@ -687,34 +1013,72 @@ declare var Headers: {
     new(init?: HeadersInit): Headers;
 };
 
-interface IDBArrayKey extends Array<number | string | Date | IDBArrayKey> {
+interface HkdfCtrParams extends Algorithm {
+    context: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer;
+    hash: string | Algorithm;
+    label: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer;
+}
+
+interface IDBArrayKey extends Array<IDBValidKey> {
 }
 
 interface IDBCursor {
+    /**
+     * Returns the direction ("next", "nextunique", "prev" or "prevunique")
+     * of the cursor.
+     */
     readonly direction: IDBCursorDirection;
-    readonly key: IDBKeyRange | number | string | Date | IDBArrayKey;
-    readonly primaryKey: any;
+    /**
+     * Returns the key of the cursor.
+     * Throws a "InvalidStateError" DOMException if the cursor is advancing or is finished.
+     */
+    readonly key: IDBValidKey | IDBKeyRange;
+    /**
+     * Returns the effective key of the cursor.
+     * Throws a "InvalidStateError" DOMException if the cursor is advancing or is finished.
+     */
+    readonly primaryKey: IDBValidKey | IDBKeyRange;
+    /**
+     * Returns the IDBObjectStore or IDBIndex the cursor was opened from.
+     */
     readonly source: IDBObjectStore | IDBIndex;
+    /**
+     * Advances the cursor through the next count records in
+     * range.
+     */
     advance(count: number): void;
-    continue(key?: IDBKeyRange | number | string | Date | IDBArrayKey): void;
+    /**
+     * Advances the cursor to the next record in range matching or
+     * after key.
+     */
+    continue(key?: IDBValidKey | IDBKeyRange): void;
+    /**
+     * Advances the cursor to the next record in range matching
+     * or after key and primaryKey. Throws an "InvalidAccessError" DOMException if the source is not an index.
+     */
+    continuePrimaryKey(key: IDBValidKey | IDBKeyRange, primaryKey: IDBValidKey | IDBKeyRange): void;
+    /**
+     * Delete the record pointed at by the cursor with a new value.
+     * If successful, request's result will be undefined.
+     */
     delete(): IDBRequest;
+    /**
+     * Updated the record pointed at by the cursor with a new value.
+     * Throws a "DataError" DOMException if the effective object store uses in-line keys and the key would have changed.
+     * If successful, request's result will be the record's key.
+     */
     update(value: any): IDBRequest;
-    readonly NEXT: string;
-    readonly NEXT_NO_DUPLICATE: string;
-    readonly PREV: string;
-    readonly PREV_NO_DUPLICATE: string;
 }
 
 declare var IDBCursor: {
     prototype: IDBCursor;
     new(): IDBCursor;
-    readonly NEXT: string;
-    readonly NEXT_NO_DUPLICATE: string;
-    readonly PREV: string;
-    readonly PREV_NO_DUPLICATE: string;
 };
 
 interface IDBCursorWithValue extends IDBCursor {
+    /**
+     * Returns the cursor's current value.
+     */
     readonly value: any;
 }
 
@@ -725,19 +1089,46 @@ declare var IDBCursorWithValue: {
 
 interface IDBDatabaseEventMap {
     "abort": Event;
+    "close": Event;
     "error": Event;
+    "versionchange": IDBVersionChangeEvent;
 }
 
 interface IDBDatabase extends EventTarget {
+    /**
+     * Returns the name of the database.
+     */
     readonly name: string;
+    /**
+     * Returns a list of the names of object stores in the database.
+     */
     readonly objectStoreNames: DOMStringList;
     onabort: ((this: IDBDatabase, ev: Event) => any) | null;
+    onclose: ((this: IDBDatabase, ev: Event) => any) | null;
     onerror: ((this: IDBDatabase, ev: Event) => any) | null;
-    onversionchange: ((this: IDBDatabase, ev: Event) => any) | null;
+    onversionchange: ((this: IDBDatabase, ev: IDBVersionChangeEvent) => any) | null;
+    /**
+     * Returns the version of the database.
+     */
     readonly version: number;
+    /**
+     * Closes the connection once all running transactions have finished.
+     */
     close(): void;
+    /**
+     * Creates a new object store with the given name and options and returns a new IDBObjectStore.
+     * Throws a "InvalidStateError" DOMException if not called within an upgrade transaction.
+     */
     createObjectStore(name: string, optionalParameters?: IDBObjectStoreParameters): IDBObjectStore;
+    /**
+     * Deletes the object store with the given name.
+     * Throws a "InvalidStateError" DOMException if not called within an upgrade transaction.
+     */
     deleteObjectStore(name: string): void;
+    /**
+     * Returns a new transaction with the given mode ("readonly" or "readwrite")
+     * and scope which can be a single object store name or an array of names.
+     */
     transaction(storeNames: string | string[], mode?: IDBTransactionMode): IDBTransaction;
     addEventListener<K extends keyof IDBDatabaseEventMap>(type: K, listener: (this: IDBDatabase, ev: IDBDatabaseEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
     addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
@@ -751,8 +1142,26 @@ declare var IDBDatabase: {
 };
 
 interface IDBFactory {
+    /**
+     * Compares two values as keys. Returns -1 if key1 precedes key2, 1 if key2 precedes key1, and 0 if
+     * the keys are equal.
+     * Throws a "DataError" DOMException if either input is not a valid key.
+     */
     cmp(first: any, second: any): number;
+    /**
+     * Attempts to delete the named database. If the
+     * database already exists and there are open connections that don't close in response to a versionchange event, the request will be blocked until all they close. If the request
+     * is successful request's result will be null.
+     */
     deleteDatabase(name: string): IDBOpenDBRequest;
+    /**
+     * Attempts to open a connection to the named database with the specified version. If the database already exists
+     * with a lower version and there are open connections that don't close in response to a versionchange event, the request will be blocked until all they close, then an upgrade
+     * will occur. If the database already exists with a higher
+     * version the request will fail. If the request is
+     * successful request's result will
+     * be the connection.
+     */
     open(name: string, version?: number): IDBOpenDBRequest;
 }
 
@@ -763,15 +1172,57 @@ declare var IDBFactory: {
 
 interface IDBIndex {
     readonly keyPath: string | string[];
-    multiEntry: boolean;
-    readonly name: string;
+    readonly multiEntry: boolean;
+    /**
+     * Updates the name of the store to newName.
+     * Throws an "InvalidStateError" DOMException if not called within an upgrade
+     * transaction.
+     */
+    name: string;
+    /**
+     * Returns the IDBObjectStore the index belongs to.
+     */
     readonly objectStore: IDBObjectStore;
     readonly unique: boolean;
-    count(key?: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-    get(key: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-    getKey(key: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-    openCursor(range?: IDBKeyRange | number | string | Date | IDBArrayKey, direction?: IDBCursorDirection): IDBRequest;
-    openKeyCursor(range?: IDBKeyRange | number | string | Date | IDBArrayKey, direction?: IDBCursorDirection): IDBRequest;
+    /**
+     * Retrieves the number of records matching the given key or key range in query.
+     * If successful, request's result will be the
+     * count.
+     */
+    count(key?: IDBValidKey | IDBKeyRange): IDBRequest;
+    /**
+     * Retrieves the value of the first record matching the
+     * given key or key range in query.
+     * If successful, request's result will be the value, or undefined if there was no matching record.
+     */
+    get(key: IDBValidKey | IDBKeyRange): IDBRequest;
+    /**
+     * Retrieves the values of the records matching the given key or key range in query (up to count if given).
+     * If successful, request's result will be an Array of the values.
+     */
+    getAll(query?: IDBValidKey | IDBKeyRange, count?: number): IDBRequest;
+    /**
+     * Retrieves the keys of records matching the given key or key range in query (up to count if given).
+     * If successful, request's result will be an Array of the keys.
+     */
+    getAllKeys(query?: IDBValidKey | IDBKeyRange, count?: number): IDBRequest;
+    /**
+     * Retrieves the key of the first record matching the
+     * given key or key range in query.
+     * If successful, request's result will be the key, or undefined if there was no matching record.
+     */
+    getKey(key: IDBValidKey | IDBKeyRange): IDBRequest;
+    /**
+     * Opens a cursor over the records matching query,
+     * ordered by direction. If query is null, all records in index are matched.
+     * If successful, request's result will be an IDBCursorWithValue, or null if there were no matching records.
+     */
+    openCursor(range?: IDBValidKey | IDBKeyRange, direction?: IDBCursorDirection): IDBRequest;
+    /**
+     * Opens a cursor with key only flag set over the records matching query, ordered by direction. If query is null, all records in index are matched.
+     * If successful, request's result will be an IDBCursor, or null if there were no matching records.
+     */
+    openKeyCursor(range?: IDBValidKey | IDBKeyRange, direction?: IDBCursorDirection): IDBRequest;
 }
 
 declare var IDBIndex: {
@@ -780,37 +1231,150 @@ declare var IDBIndex: {
 };
 
 interface IDBKeyRange {
+    /**
+     * Returns lower bound, or undefined if none.
+     */
     readonly lower: any;
+    /**
+     * Returns true if the lower open flag is set, and false otherwise.
+     */
     readonly lowerOpen: boolean;
+    /**
+     * Returns upper bound, or undefined if none.
+     */
     readonly upper: any;
+    /**
+     * Returns true if the upper open flag is set, and false otherwise.
+     */
     readonly upperOpen: boolean;
+    /**
+     * Returns true if key is included in the range, and false otherwise.
+     */
+    includes(key: any): boolean;
 }
 
 declare var IDBKeyRange: {
     prototype: IDBKeyRange;
     new(): IDBKeyRange;
+    /**
+     * Returns a new IDBKeyRange spanning from lower to upper.
+     * If lowerOpen is true, lower is not included in the range.
+     * If upperOpen is true, upper is not included in the range.
+     */
     bound(lower: any, upper: any, lowerOpen?: boolean, upperOpen?: boolean): IDBKeyRange;
+    /**
+     * Returns a new IDBKeyRange starting at key with no
+     * upper bound. If open is true, key is not included in the
+     * range.
+     */
     lowerBound(lower: any, open?: boolean): IDBKeyRange;
+    /**
+     * Returns a new IDBKeyRange spanning only key.
+     */
     only(value: any): IDBKeyRange;
+    /**
+     * Returns a new IDBKeyRange with no lower bound and ending at key. If open is true, key is not included in the range.
+     */
     upperBound(upper: any, open?: boolean): IDBKeyRange;
 };
 
 interface IDBObjectStore {
-    autoIncrement: boolean;
+    /**
+     * Returns true if the store has a key generator, and false otherwise.
+     */
+    readonly autoIncrement: boolean;
+    /**
+     * Returns a list of the names of indexes in the store.
+     */
     readonly indexNames: DOMStringList;
-    readonly keyPath: string | string[] | null;
-    readonly name: string;
+    /**
+     * Returns the key path of the store, or null if none.
+     */
+    readonly keyPath: string | string[];
+    /**
+     * Updates the name of the store to newName.
+     * Throws "InvalidStateError" DOMException if not called within an upgrade
+     * transaction.
+     */
+    name: string;
+    /**
+     * Returns the associated transaction.
+     */
     readonly transaction: IDBTransaction;
-    add(value: any, key?: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
+    add(value: any, key?: IDBValidKey | IDBKeyRange): IDBRequest;
+    /**
+     * Deletes all records in store.
+     * If successful, request's result will
+     * be undefined.
+     */
     clear(): IDBRequest;
-    count(key?: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-    createIndex(name: string, keyPath: string | string[], optionalParameters?: IDBIndexParameters): IDBIndex;
-    delete(key: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
-    deleteIndex(indexName: string): void;
-    get(key: any): IDBRequest;
+    /**
+     * Retrieves the number of records matching the
+     * given key or key range in query.
+     * If successful, request's result will be the count.
+     */
+    count(key?: IDBValidKey | IDBKeyRange): IDBRequest;
+    /**
+     * Creates a new index in store with the given name, keyPath and options and returns a new IDBIndex. If the keyPath and options define constraints that cannot be
+     * satisfied with the data already in store the upgrade
+     * transaction will abort with
+     * a "ConstraintError" DOMException.
+     * Throws an "InvalidStateError" DOMException if not called within an upgrade
+     * transaction.
+     */
+    createIndex(name: string, keyPath: string | string[], options?: IDBIndexParameters): IDBIndex;
+    /**
+     * Deletes records in store with the given key or in the given key range in query.
+     * If successful, request's result will
+     * be undefined.
+     */
+    delete(key: IDBValidKey | IDBKeyRange): IDBRequest;
+    /**
+     * Deletes the index in store with the given name.
+     * Throws an "InvalidStateError" DOMException if not called within an upgrade
+     * transaction.
+     */
+    deleteIndex(name: string): void;
+    /**
+     * Retrieves the value of the first record matching the
+     * given key or key range in query.
+     * If successful, request's result will be the value, or undefined if there was no matching record.
+     */
+    get(query: IDBValidKey | IDBKeyRange): IDBRequest;
+    /**
+     * Retrieves the values of the records matching the
+     * given key or key range in query (up to count if given).
+     * If successful, request's result will
+     * be an Array of the values.
+     */
+    getAll(query?: IDBValidKey | IDBKeyRange, count?: number): IDBRequest;
+    /**
+     * Retrieves the keys of records matching the
+     * given key or key range in query (up to count if given).
+     * If successful, request's result will
+     * be an Array of the keys.
+     */
+    getAllKeys(query?: IDBValidKey | IDBKeyRange, count?: number): IDBRequest;
+    /**
+     * Retrieves the key of the first record matching the
+     * given key or key range in query.
+     * If successful, request's result will be the key, or undefined if there was no matching record.
+     */
+    getKey(query: IDBValidKey | IDBKeyRange): IDBRequest;
     index(name: string): IDBIndex;
-    openCursor(range?: IDBKeyRange | number | string | Date | IDBArrayKey, direction?: IDBCursorDirection): IDBRequest;
-    put(value: any, key?: IDBKeyRange | number | string | Date | IDBArrayKey): IDBRequest;
+    /**
+     * Opens a cursor over the records matching query,
+     * ordered by direction. If query is null, all records in store are matched.
+     * If successful, request's result will be an IDBCursorWithValue pointing at the first matching record, or null if there were no matching records.
+     */
+    openCursor(range?: IDBValidKey | IDBKeyRange, direction?: IDBCursorDirection): IDBRequest;
+    /**
+     * Opens a cursor with key only flag set over the records matching query, ordered by direction. If query is null, all records in store are matched.
+     * If successful, request's result will be an IDBCursor pointing at the first matching record, or
+     * null if there were no matching records.
+     */
+    openKeyCursor(query?: IDBValidKey | IDBKeyRange, direction?: IDBCursorDirection): IDBRequest;
+    put(value: any, key?: IDBValidKey | IDBKeyRange): IDBRequest;
 }
 
 declare var IDBObjectStore: {
@@ -843,13 +1407,34 @@ interface IDBRequestEventMap {
 }
 
 interface IDBRequest extends EventTarget {
-    readonly error: DOMException;
+    /**
+     * When a request is completed, returns the error (a DOMException), or null if the request succeeded. Throws
+     * a "InvalidStateError" DOMException if the request is still pending.
+     */
+    readonly error: DOMException | null;
     onerror: ((this: IDBRequest, ev: Event) => any) | null;
     onsuccess: ((this: IDBRequest, ev: Event) => any) | null;
+    /**
+     * Returns "pending" until a request is complete,
+     * then returns "done".
+     */
     readonly readyState: IDBRequestReadyState;
+    /**
+     * When a request is completed, returns the result,
+     * or undefined if the request failed. Throws a
+     * "InvalidStateError" DOMException if the request is still pending.
+     */
     readonly result: any;
+    /**
+     * Returns the IDBObjectStore, IDBIndex, or IDBCursor the request was made against, or null if is was an open
+     * request.
+     */
     readonly source: IDBObjectStore | IDBIndex | IDBCursor;
-    readonly transaction: IDBTransaction;
+    /**
+     * Returns the IDBTransaction the request was made within.
+     * If this as an open request, then it returns an upgrade transaction while it is running, or null otherwise.
+     */
+    readonly transaction: IDBTransaction | null;
     addEventListener<K extends keyof IDBRequestEventMap>(type: K, listener: (this: IDBRequest, ev: IDBRequestEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
     addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
     removeEventListener<K extends keyof IDBRequestEventMap>(type: K, listener: (this: IDBRequest, ev: IDBRequestEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
@@ -868,17 +1453,39 @@ interface IDBTransactionEventMap {
 }
 
 interface IDBTransaction extends EventTarget {
+    /**
+     * Returns the transaction's connection.
+     */
     readonly db: IDBDatabase;
+    /**
+     * If the transaction was aborted, returns the
+     * error (a DOMException) providing the reason.
+     */
     readonly error: DOMException;
+    /**
+     * Returns the mode the transaction was created with
+     * ("readonly" or "readwrite"), or "versionchange" for
+     * an upgrade transaction.
+     */
     readonly mode: IDBTransactionMode;
+    /**
+     * Returns a list of the names of object stores in the
+     * transaction's scope. For an upgrade transaction this is all object stores in the database.
+     */
+    readonly objectStoreNames: DOMStringList;
     onabort: ((this: IDBTransaction, ev: Event) => any) | null;
     oncomplete: ((this: IDBTransaction, ev: Event) => any) | null;
     onerror: ((this: IDBTransaction, ev: Event) => any) | null;
+    /**
+     * Aborts the transaction. All pending requests will fail with
+     * a "AbortError" DOMException and all changes made to the database will be
+     * reverted.
+     */
     abort(): void;
+    /**
+     * Returns an IDBObjectStore in the transaction's scope.
+     */
     objectStore(name: string): IDBObjectStore;
-    readonly READ_ONLY: string;
-    readonly READ_WRITE: string;
-    readonly VERSION_CHANGE: string;
     addEventListener<K extends keyof IDBTransactionEventMap>(type: K, listener: (this: IDBTransaction, ev: IDBTransactionEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
     addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
     removeEventListener<K extends keyof IDBTransactionEventMap>(type: K, listener: (this: IDBTransaction, ev: IDBTransactionEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
@@ -888,9 +1495,6 @@ interface IDBTransaction extends EventTarget {
 declare var IDBTransaction: {
     prototype: IDBTransaction;
     new(): IDBTransaction;
-    readonly READ_ONLY: string;
-    readonly READ_WRITE: string;
-    readonly VERSION_CHANGE: string;
 };
 
 interface IDBVersionChangeEvent extends Event {
@@ -900,7 +1504,7 @@ interface IDBVersionChangeEvent extends Event {
 
 declare var IDBVersionChangeEvent: {
     prototype: IDBVersionChangeEvent;
-    new(): IDBVersionChangeEvent;
+    new(type: string, eventInitDict?: IDBVersionChangeEventInit): IDBVersionChangeEvent;
 };
 
 interface ImageBitmap {
@@ -919,9 +1523,6 @@ interface ImageBitmapOptions {
 }
 
 interface ImageData {
-    readonly data: Uint8ClampedArray;
-    readonly height: number;
-    readonly width: number;
 }
 
 declare var ImageData: {
@@ -944,7 +1545,7 @@ interface MessageEvent extends Event {
     readonly data: any;
     readonly origin: string;
     readonly ports: ReadonlyArray<MessagePort>;
-    readonly source: object | null;
+    readonly source: MessageEventSource;
     initMessageEvent(type: string, bubbles: boolean, cancelable: boolean, data: any, origin: string, lastEventId: string, source: object): void;
 }
 
@@ -955,12 +1556,27 @@ declare var MessageEvent: {
 
 interface MessagePortEventMap {
     "message": MessageEvent;
+    "messageerror": MessageEvent;
 }
 
 interface MessagePort extends EventTarget {
     onmessage: ((this: MessagePort, ev: MessageEvent) => any) | null;
+    onmessageerror: ((this: MessagePort, ev: MessageEvent) => any) | null;
+    /**
+     * Disconnects the port, so that it is no longer active.
+     */
     close(): void;
-    postMessage(message?: any, transfer?: any[]): void;
+    /**
+     * Posts a message through the channel. Objects listed in transfer are
+     * transferred, not just cloned, meaning that they are no longer usable on the sending side.
+     * Throws a "DataCloneError" DOMException if
+     * transfer contains duplicate objects or port, or if message
+     * could not be cloned.
+     */
+    postMessage(message: any, transfer?: any[]): void;
+    /**
+     * Begins dispatching messages received on the port.
+     */
     start(): void;
     addEventListener<K extends keyof MessagePortEventMap>(type: K, listener: (this: MessagePort, ev: MessagePortEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
     addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
@@ -973,6 +1589,18 @@ declare var MessagePort: {
     new(): MessagePort;
 };
 
+interface NavigationPreloadManager {
+    disable(): Promise<void>;
+    enable(): Promise<void>;
+    getState(): Promise<NavigationPreloadState>;
+    setHeaderValue(value: string): Promise<void>;
+}
+
+declare var NavigationPreloadManager: {
+    prototype: NavigationPreloadManager;
+    new(): NavigationPreloadManager;
+};
+
 interface NavigatorBeacon {
     sendBeacon(url: string, data?: Blob | Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | FormData | string | null): boolean;
 }
@@ -997,6 +1625,10 @@ interface NavigatorOnLine {
     readonly onLine: boolean;
 }
 
+interface NavigatorStorage {
+    readonly storage: StorageManager;
+}
+
 interface NotificationEventMap {
     "click": Event;
     "close": Event;
@@ -1005,18 +1637,25 @@ interface NotificationEventMap {
 }
 
 interface Notification extends EventTarget {
-    readonly body: string | null;
+    readonly actions: ReadonlyArray<NotificationAction>;
+    readonly badge: string;
+    readonly body: string;
     readonly data: any;
     readonly dir: NotificationDirection;
-    readonly icon: string | null;
-    readonly lang: string | null;
+    readonly icon: string;
+    readonly image: string;
+    readonly lang: string;
     onclick: ((this: Notification, ev: Event) => any) | null;
     onclose: ((this: Notification, ev: Event) => any) | null;
     onerror: ((this: Notification, ev: Event) => any) | null;
     onshow: ((this: Notification, ev: Event) => any) | null;
-    readonly permission: NotificationPermission;
-    readonly tag: string | null;
+    readonly renotify: boolean;
+    readonly requireInteraction: boolean;
+    readonly silent: boolean;
+    readonly tag: string;
+    readonly timestamp: number;
     readonly title: string;
+    readonly vibrate: ReadonlyArray<number>;
     close(): void;
     addEventListener<K extends keyof NotificationEventMap>(type: K, listener: (this: Notification, ev: NotificationEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
     addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
@@ -1027,7 +1666,8 @@ interface Notification extends EventTarget {
 declare var Notification: {
     prototype: Notification;
     new(title: string, options?: NotificationOptions): Notification;
-    requestPermission(callback?: NotificationPermissionCallback): Promise<NotificationPermission>;
+    readonly maxActions: number;
+    readonly permission: NotificationPermission;
 };
 
 interface NotificationEvent extends ExtendableEvent {
@@ -1040,27 +1680,28 @@ declare var NotificationEvent: {
     new(type: string, eventInitDict: NotificationEventInit): NotificationEvent;
 };
 
-interface Performance {
-    /** @deprecated */
-    readonly navigation: PerformanceNavigation;
+interface PerformanceEventMap {
+    "resourcetimingbufferfull": Event;
+}
+
+interface Performance extends EventTarget {
+    onresourcetimingbufferfull: ((this: Performance, ev: Event) => any) | null;
     readonly timeOrigin: number;
-    /** @deprecated */
-    readonly timing: PerformanceTiming;
     clearMarks(markName?: string): void;
     clearMeasures(measureName?: string): void;
     clearResourceTimings(): void;
-    getEntries(): any;
-    getEntriesByName(name: string, type?: string): any;
-    getEntriesByType(type: string): any;
-    /** @deprecated */
-    getMarks(markName?: string): any;
-    /** @deprecated */
-    getMeasures(measureName?: string): any;
+    getEntries(): PerformanceEntryList;
+    getEntriesByName(name: string, type?: string): PerformanceEntryList;
+    getEntriesByType(type: string): PerformanceEntryList;
     mark(markName: string): void;
-    measure(measureName: string, startMarkName?: string, endMarkName?: string): void;
+    measure(measureName: string, startMark?: string, endMark?: string): void;
     now(): number;
     setResourceTimingBufferSize(maxSize: number): void;
     toJSON(): any;
+    addEventListener<K extends keyof PerformanceEventMap>(type: K, listener: (this: Performance, ev: PerformanceEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
+    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
+    removeEventListener<K extends keyof PerformanceEventMap>(type: K, listener: (this: Performance, ev: PerformanceEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
+    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
 }
 
 declare var Performance: {
@@ -1068,93 +1709,102 @@ declare var Performance: {
     new(): Performance;
 };
 
-interface PerformanceNavigation {
-    readonly redirectCount: number;
-    readonly type: number;
+interface PerformanceEntry {
+    readonly duration: number;
+    readonly entryType: string;
+    readonly name: string;
+    readonly startTime: number;
     toJSON(): any;
-    readonly TYPE_BACK_FORWARD: number;
-    readonly TYPE_NAVIGATE: number;
-    readonly TYPE_RELOAD: number;
-    readonly TYPE_RESERVED: number;
 }
 
-declare var PerformanceNavigation: {
-    prototype: PerformanceNavigation;
-    new(): PerformanceNavigation;
-    readonly TYPE_BACK_FORWARD: number;
-    readonly TYPE_NAVIGATE: number;
-    readonly TYPE_RELOAD: number;
-    readonly TYPE_RESERVED: number;
+declare var PerformanceEntry: {
+    prototype: PerformanceEntry;
+    new(): PerformanceEntry;
 };
 
-interface PerformanceTiming {
+interface PerformanceMark extends PerformanceEntry {
+}
+
+declare var PerformanceMark: {
+    prototype: PerformanceMark;
+    new(): PerformanceMark;
+};
+
+interface PerformanceMeasure extends PerformanceEntry {
+}
+
+declare var PerformanceMeasure: {
+    prototype: PerformanceMeasure;
+    new(): PerformanceMeasure;
+};
+
+interface PerformanceObserver {
+    disconnect(): void;
+    observe(options: PerformanceObserverInit): void;
+    takeRecords(): PerformanceEntryList;
+}
+
+declare var PerformanceObserver: {
+    prototype: PerformanceObserver;
+    new(callback: PerformanceObserverCallback): PerformanceObserver;
+};
+
+interface PerformanceObserverEntryList {
+    getEntries(): PerformanceEntryList;
+    getEntriesByName(name: string, type?: string): PerformanceEntryList;
+    getEntriesByType(type: string): PerformanceEntryList;
+}
+
+declare var PerformanceObserverEntryList: {
+    prototype: PerformanceObserverEntryList;
+    new(): PerformanceObserverEntryList;
+};
+
+interface PerformanceResourceTiming extends PerformanceEntry {
     readonly connectEnd: number;
     readonly connectStart: number;
-    readonly domComplete: number;
-    readonly domContentLoadedEventEnd: number;
-    readonly domContentLoadedEventStart: number;
-    readonly domInteractive: number;
-    readonly domLoading: number;
+    readonly decodedBodySize: number;
     readonly domainLookupEnd: number;
     readonly domainLookupStart: number;
+    readonly encodedBodySize: number;
     readonly fetchStart: number;
-    readonly loadEventEnd: number;
-    readonly loadEventStart: number;
-    readonly msFirstPaint: number;
-    readonly navigationStart: number;
+    readonly initiatorType: string;
+    readonly nextHopProtocol: string;
     readonly redirectEnd: number;
     readonly redirectStart: number;
     readonly requestStart: number;
     readonly responseEnd: number;
     readonly responseStart: number;
     readonly secureConnectionStart: number;
-    readonly unloadEventEnd: number;
-    readonly unloadEventStart: number;
+    readonly transferSize: number;
+    readonly workerStart: number;
     toJSON(): any;
 }
 
-declare var PerformanceTiming: {
-    prototype: PerformanceTiming;
-    new(): PerformanceTiming;
-};
-
-interface Position {
-    readonly coords: Coordinates;
-    readonly timestamp: number;
-}
-
-declare var Position: {
-    prototype: Position;
-    new(): Position;
-};
-
-interface PositionError {
-    readonly code: number;
-    readonly message: string;
-    toString(): string;
-    readonly PERMISSION_DENIED: number;
-    readonly POSITION_UNAVAILABLE: number;
-    readonly TIMEOUT: number;
-}
-
-declare var PositionError: {
-    prototype: PositionError;
-    new(): PositionError;
-    readonly PERMISSION_DENIED: number;
-    readonly POSITION_UNAVAILABLE: number;
-    readonly TIMEOUT: number;
+declare var PerformanceResourceTiming: {
+    prototype: PerformanceResourceTiming;
+    new(): PerformanceResourceTiming;
 };
 
 interface ProgressEvent extends Event {
     readonly lengthComputable: boolean;
     readonly loaded: number;
     readonly total: number;
-    initProgressEvent(typeArg: string, canBubbleArg: boolean, cancelableArg: boolean, lengthComputableArg: boolean, loadedArg: number, totalArg: number): void;
 }
 
 declare var ProgressEvent: {
     prototype: ProgressEvent;
-    new(typeArg: string, eventInitDict?: ProgressEventInit): ProgressEvent;
+    new(type: string, eventInitDict?: ProgressEventInit): ProgressEvent;
+};
+
+interface PromiseRejectionEvent extends Event {
+    readonly promise: PromiseLike<any>;
+    readonly reason: any;
+}
+
+declare var PromiseRejectionEvent: {
+    prototype: PromiseRejectionEvent;
+    new(type: string, eventInitDict: PromiseRejectionEventInit): PromiseRejectionEvent;
 };
 
 interface PushEvent extends ExtendableEvent {
@@ -1167,7 +1817,6 @@ declare var PushEvent: {
 };
 
 interface PushManager {
-    readonly supportedContentEncodings: ReadonlyArray<string>;
     getSubscription(): Promise<PushSubscription | null>;
     permissionState(options?: PushSubscriptionOptionsInit): Promise<PushPermissionState>;
     subscribe(options?: PushSubscriptionOptionsInit): Promise<PushSubscription>;
@@ -1176,6 +1825,7 @@ interface PushManager {
 declare var PushManager: {
     prototype: PushManager;
     new(): PushManager;
+    readonly supportedContentEncodings: ReadonlyArray<string>;
 };
 
 interface PushMessageData {
@@ -1195,7 +1845,7 @@ interface PushSubscription {
     readonly expirationTime: number | null;
     readonly options: PushSubscriptionOptions;
     getKey(name: PushEncryptionKeyName): ArrayBuffer | null;
-    toJSON(): any;
+    toJSON(): PushSubscriptionJSON;
     unsubscribe(): Promise<boolean>;
 }
 
@@ -1247,35 +1897,97 @@ declare var ReadableStreamReader: {
 };
 
 interface Request extends Body {
+    /**
+     * Returns the cache mode associated with request, which is a string indicating
+     * how the the request will interact with the browser's cache when fetching.
+     */
     readonly cache: RequestCache;
+    /**
+     * Returns the credentials mode associated with request, which is a string
+     * indicating whether credentials will be sent with the request always, never, or only when sent to a
+     * same-origin URL.
+     */
     readonly credentials: RequestCredentials;
+    /**
+     * Returns the kind of resource requested by request, e.g., "document" or
+     * "script".
+     */
     readonly destination: RequestDestination;
+    /**
+     * Returns a Headers object consisting of the headers associated with request.
+     * Note that headers added in the network layer by the user agent will not be accounted for in this
+     * object, e.g., the "Host" header.
+     */
     readonly headers: Headers;
+    /**
+     * Returns request's subresource integrity metadata, which is a cryptographic hash of
+     * the resource being fetched. Its value consists of multiple hashes separated by whitespace. [SRI]
+     */
     readonly integrity: string;
+    /**
+     * Returns a boolean indicating whether or not request is for a history
+     * navigation (a.k.a. back-foward navigation).
+     */
+    readonly isHistoryNavigation: boolean;
+    /**
+     * Returns a boolean indicating whether or not request is for a reload navigation.
+     */
+    readonly isReloadNavigation: boolean;
+    /**
+     * Returns a boolean indicating whether or not request can outlive the global in which
+     * it was created.
+     */
     readonly keepalive: boolean;
+    /**
+     * Returns request's HTTP method, which is "GET" by default.
+     */
     readonly method: string;
+    /**
+     * Returns the mode associated with request, which is a string indicating
+     * whether the request will use CORS, or will be restricted to same-origin URLs.
+     */
     readonly mode: RequestMode;
+    /**
+     * Returns the redirect mode associated with request, which is a string
+     * indicating how redirects for the request will be handled during fetching. A request will follow redirects by default.
+     */
     readonly redirect: RequestRedirect;
+    /**
+     * Returns the referrer of request. Its value can be a same-origin URL if
+     * explicitly set in init, the empty string to indicate no referrer, and
+     * "about:client" when defaulting to the global's default. This is used during
+     * fetching to determine the value of the `Referer` header of the request being made.
+     */
     readonly referrer: string;
+    /**
+     * Returns the referrer policy associated with request. This is used during
+     * fetching to compute the value of the request's referrer.
+     */
     readonly referrerPolicy: ReferrerPolicy;
-    readonly signal: object | null;
-    readonly type: RequestType;
+    /**
+     * Returns the signal associated with request, which is an AbortSignal object indicating whether or not request has been aborted, and its abort
+     * event handler.
+     */
+    readonly signal: object;
+    /**
+     * Returns the URL of request as a string.
+     */
     readonly url: string;
     clone(): Request;
 }
 
 declare var Request: {
     prototype: Request;
-    new(input: Request | string, init?: RequestInit): Request;
+    new(input: RequestInfo, init?: RequestInit): Request;
 };
 
 interface Response extends Body {
-    readonly body: ReadableStream | null;
     readonly headers: Headers;
     readonly ok: boolean;
     readonly redirected: boolean;
     readonly status: number;
     readonly statusText: string;
+    readonly trailer: Promise<Headers>;
     readonly type: ResponseType;
     readonly url: string;
     clone(): Response;
@@ -1283,7 +1995,7 @@ interface Response extends Body {
 
 declare var Response: {
     prototype: Response;
-    new(body?: Blob | Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | FormData | string | null, init?: ResponseInit): Response;
+    new(body?: BodyInit | null, init?: ResponseInit): Response;
     error(): Response;
     redirect(url: string, status?: number): Response;
 };
@@ -1308,6 +2020,33 @@ declare var ServiceWorker: {
     new(): ServiceWorker;
 };
 
+interface ServiceWorkerContainerEventMap {
+    "controllerchange": Event;
+    "message": MessageEvent;
+    "messageerror": MessageEvent;
+}
+
+interface ServiceWorkerContainer extends EventTarget {
+    readonly controller: ServiceWorker | null;
+    oncontrollerchange: ((this: ServiceWorkerContainer, ev: Event) => any) | null;
+    onmessage: ((this: ServiceWorkerContainer, ev: MessageEvent) => any) | null;
+    onmessageerror: ((this: ServiceWorkerContainer, ev: MessageEvent) => any) | null;
+    readonly ready: Promise<ServiceWorkerRegistration>;
+    getRegistration(clientURL?: string): Promise<ServiceWorkerRegistration | undefined>;
+    getRegistrations(): Promise<ReadonlyArray<ServiceWorkerRegistration>>;
+    register(scriptURL: string, options?: RegistrationOptions): Promise<ServiceWorkerRegistration>;
+    startMessages(): void;
+    addEventListener<K extends keyof ServiceWorkerContainerEventMap>(type: K, listener: (this: ServiceWorkerContainer, ev: ServiceWorkerContainerEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
+    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
+    removeEventListener<K extends keyof ServiceWorkerContainerEventMap>(type: K, listener: (this: ServiceWorkerContainer, ev: ServiceWorkerContainerEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
+    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
+}
+
+declare var ServiceWorkerContainer: {
+    prototype: ServiceWorkerContainer;
+    new(): ServiceWorkerContainer;
+};
+
 interface ServiceWorkerGlobalScopeEventMap extends WorkerGlobalScopeEventMap {
     "activate": ExtendableEvent;
     "fetch": FetchEvent;
@@ -1353,10 +2092,12 @@ interface ServiceWorkerRegistrationEventMap {
 interface ServiceWorkerRegistration extends EventTarget {
     readonly active: ServiceWorker | null;
     readonly installing: ServiceWorker | null;
+    readonly navigationPreload: NavigationPreloadManager;
     onupdatefound: ((this: ServiceWorkerRegistration, ev: Event) => any) | null;
     readonly pushManager: PushManager;
     readonly scope: string;
     readonly sync: SyncManager;
+    readonly updateViaCache: ServiceWorkerUpdateViaCache;
     readonly waiting: ServiceWorker | null;
     getNotifications(filter?: GetNotificationOptions): Promise<Notification[]>;
     showNotification(title: string, options?: NotificationOptions): Promise<void>;
@@ -1373,6 +2114,16 @@ declare var ServiceWorkerRegistration: {
     new(): ServiceWorkerRegistration;
 };
 
+interface StorageManager {
+    estimate(): Promise<StorageEstimate>;
+    persisted(): Promise<boolean>;
+}
+
+declare var StorageManager: {
+    prototype: StorageManager;
+    new(): StorageManager;
+};
+
 interface SyncEvent extends ExtendableEvent {
     readonly lastChance: boolean;
     readonly tag: string;
@@ -1393,6 +2144,57 @@ declare var SyncManager: {
     new(): SyncManager;
 };
 
+interface TextDecoder {
+    /**
+     * Returns encoding's name, lowercased.
+     */
+    readonly encoding: string;
+    /**
+     * Returns true if error mode is "fatal", and false
+     * otherwise.
+     */
+    readonly fatal: boolean;
+    /**
+     * Returns true if ignore BOM flag is set, and false otherwise.
+     */
+    readonly ignoreBOM: boolean;
+    /**
+     * Returns the result of running encoding's decoder. The
+     * method can be invoked zero or more times with options's stream set to
+     * true, and then once without options's stream (or set to false), to process
+     * a fragmented stream. If the invocation without options's stream (or set to
+     * false) has no input, it's clearest to omit both arguments.
+     * var string = "", decoder = new TextDecoder(encoding), buffer;
+     * while(buffer = next_chunk()) {
+     * string += decoder.decode(buffer, {stream:true});
+     * }
+     * string += decoder.decode(); // end-of-stream
+     * If the error mode is "fatal" and encoding's decoder returns error, throws a TypeError.
+     */
+    decode(input?: BufferSource, options?: TextDecodeOptions): string;
+}
+
+declare var TextDecoder: {
+    prototype: TextDecoder;
+    new(label?: string, options?: TextDecoderOptions): TextDecoder;
+};
+
+interface TextEncoder {
+    /**
+     * Returns "utf-8".
+     */
+    readonly encoding: string;
+    /**
+     * Returns the result of running UTF-8's encoder.
+     */
+    encode(input?: string): Uint8Array;
+}
+
+declare var TextEncoder: {
+    prototype: TextEncoder;
+    new(): TextEncoder;
+};
+
 interface URL {
     hash: string;
     host: string;
@@ -1406,13 +2208,13 @@ interface URL {
     search: string;
     readonly searchParams: URLSearchParams;
     username: string;
-    toString(): string;
+    toJSON(): string;
 }
 
 declare var URL: {
     prototype: URL;
     new(url: string, base?: string | URL): URL;
-    createObjectURL(object: any, options?: ObjectURLOptions): string;
+    createObjectURL(object: any): string;
     revokeObjectURL(url: string): void;
 };
 
@@ -1441,11 +2243,13 @@ interface URLSearchParams {
      * Sets the value associated to a given search parameter to the given value. If there were several values, delete the others.
      */
     set(name: string, value: string): void;
+    sort(): void;
+    forEach(callbackfn: (value: string, key: string, parent: URLSearchParams) => void, thisArg?: any): void;
 }
 
 declare var URLSearchParams: {
     prototype: URLSearchParams;
-    new (init?: string | URLSearchParams): URLSearchParams;
+    new(init?: string[][] | Record<string, string> | string | URLSearchParams): URLSearchParams;
 };
 
 interface WebSocketEventMap {
@@ -1497,7 +2301,7 @@ interface WindowClient extends Client {
     readonly focused: boolean;
     readonly visibilityState: VisibilityState;
     focus(): Promise<WindowClient>;
-    navigate(url: string): Promise<WindowClient>;
+    navigate(url: string): Promise<WindowClient | null>;
 }
 
 declare var WindowClient: {
@@ -1515,7 +2319,6 @@ interface WorkerEventMap extends AbstractWorkerEventMap {
 
 interface Worker extends EventTarget, AbstractWorker {
     onmessage: ((this: Worker, ev: MessageEvent) => any) | null;
-    /** @deprecated */
     postMessage(message: any, transfer?: any[]): void;
     terminate(): void;
     addEventListener<K extends keyof WorkerEventMap>(type: K, listener: (this: Worker, ev: WorkerEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
@@ -1572,7 +2375,8 @@ declare var WorkerLocation: {
     new(): WorkerLocation;
 };
 
-interface WorkerNavigator extends NavigatorID, NavigatorOnLine, NavigatorBeacon, NavigatorConcurrentHardware {
+interface WorkerNavigator extends NavigatorID, NavigatorOnLine, NavigatorBeacon, NavigatorConcurrentHardware, NavigatorStorage {
+    readonly serviceWorker: ServiceWorkerContainer;
 }
 
 declare var WorkerNavigator: {
@@ -1597,28 +2401,91 @@ interface XMLHttpRequestEventMap extends XMLHttpRequestEventTargetEventMap {
     "readystatechange": Event;
 }
 
-interface XMLHttpRequest extends EventTarget, XMLHttpRequestEventTarget {
-    msCaching: string;
+interface XMLHttpRequest extends XMLHttpRequestEventTarget {
     onreadystatechange: ((this: XMLHttpRequest, ev: Event) => any) | null;
+    /**
+     * Returns client's state.
+     */
     readonly readyState: number;
+    /**
+     * Returns the response's body.
+     */
     readonly response: any;
+    /**
+     * Returns the text response.
+     * Throws an "InvalidStateError" DOMException if responseType is not the empty string or "text".
+     */
     readonly responseText: string;
+    /**
+     * Returns the response type.
+     * Can be set to change the response type. Values are:
+     * the empty string (default),
+     * "arraybuffer",
+     * "blob",
+     * "document",
+     * "json", and
+     * "text".
+     * When set: setting to "document" is ignored if current global object is not a Window object.
+     * When set: throws an "InvalidStateError" DOMException if state is loading or done.
+     * When set: throws an "InvalidAccessError" DOMException if the synchronous flag is set and current global object is a Window object.
+     */
     responseType: XMLHttpRequestResponseType;
     readonly responseURL: string;
-    readonly responseXML: object | null;
     readonly status: number;
     readonly statusText: string;
+    /**
+     * Can be set to a time in milliseconds. When set to a non-zero value will cause fetching to terminate after the given time has passed. When the time has passed, the
+     * request has not yet completed, and the synchronous flag is unset, a timeout event will then be dispatched, or a
+     * "TimeoutError" DOMException will be thrown otherwise (for the send() method).
+     * When set: throws an "InvalidAccessError" DOMException if the synchronous flag is set and current global object is a Window object.
+     */
     timeout: number;
+    /**
+     * Returns the associated XMLHttpRequestUpload object. It can be used to gather transmission information when data is
+     * transferred to a server.
+     */
     readonly upload: XMLHttpRequestUpload;
+    /**
+     * True when credentials are to be included in a cross-origin request. False when they are
+     * to be excluded in a cross-origin request and when cookies are to be ignored in its response.
+     * Initially false.
+     * When set: throws an "InvalidStateError" DOMException if state is not unsent or opened, or if the send() flag is set.
+     */
     withCredentials: boolean;
+    /**
+     * Cancels any network activity.
+     */
     abort(): void;
     getAllResponseHeaders(): string;
-    getResponseHeader(header: string): string | null;
-    msCachingEnabled(): boolean;
-    open(method: string, url: string, async?: boolean, user?: string | null, password?: string | null): void;
+    getResponseHeader(name: string): string | null;
+    /**
+     * Sets the request method, request URL, and synchronous flag.
+     * Throws a "SyntaxError" DOMException if either method is not a
+     * valid HTTP method or url cannot be parsed.
+     * Throws a "SecurityError" DOMException if method is a
+     * case-insensitive match for `CONNECT`, `TRACE`, or `TRACK`.
+     * Throws an "InvalidAccessError" DOMException if async is false, current global object is a Window object, and the timeout attribute is not zero or the responseType attribute is not the empty string.
+     */
+    open(method: string, url: string): void;
+    open(method: string, url: string, async: boolean, username?: string | null, password?: string | null): void;
+    /**
+     * Acts as if the `Content-Type` header value for response is mime.
+     * (It does not actually change the header though.)
+     * Throws an "InvalidStateError" DOMException if state is loading or done.
+     */
     overrideMimeType(mime: string): void;
-    send(data?: any): void;
-    setRequestHeader(header: string, value: string): void;
+    /**
+     * Initiates the request. The optional argument provides the request body. The argument is ignored if request method is GET or HEAD.
+     * Throws an "InvalidStateError" DOMException if either state is not opened or the send() flag is set.
+     */
+    send(body?: object | BodyInit): void;
+    /**
+     * Combines a header in author request headers.
+     * Throws an "InvalidStateError" DOMException if either state is not opened or the send() flag is set.
+     * Throws a "SyntaxError" DOMException if name is not a header name
+     * or if value is not a header value.
+     */
+    setRequestHeader(name: string, value: string): void;
     readonly DONE: number;
     readonly HEADERS_RECEIVED: number;
     readonly LOADING: number;
@@ -1641,21 +2508,21 @@ declare var XMLHttpRequest: {
 };
 
 interface XMLHttpRequestEventTargetEventMap {
-    "abort": Event;
-    "error": ErrorEvent;
-    "load": Event;
+    "abort": ProgressEvent;
+    "error": ProgressEvent;
+    "load": ProgressEvent;
     "loadend": ProgressEvent;
-    "loadstart": Event;
+    "loadstart": ProgressEvent;
     "progress": ProgressEvent;
     "timeout": ProgressEvent;
 }
 
-interface XMLHttpRequestEventTarget {
-    onabort: ((this: XMLHttpRequest, ev: Event) => any) | null;
-    onerror: ((this: XMLHttpRequest, ev: ErrorEvent) => any) | null;
-    onload: ((this: XMLHttpRequest, ev: Event) => any) | null;
+interface XMLHttpRequestEventTarget extends EventTarget {
+    onabort: ((this: XMLHttpRequest, ev: ProgressEvent) => any) | null;
+    onerror: ((this: XMLHttpRequest, ev: ProgressEvent) => any) | null;
+    onload: ((this: XMLHttpRequest, ev: ProgressEvent) => any) | null;
     onloadend: ((this: XMLHttpRequest, ev: ProgressEvent) => any) | null;
-    onloadstart: ((this: XMLHttpRequest, ev: Event) => any) | null;
+    onloadstart: ((this: XMLHttpRequest, ev: ProgressEvent) => any) | null;
     onprogress: ((this: XMLHttpRequest, ev: ProgressEvent) => any) | null;
     ontimeout: ((this: XMLHttpRequest, ev: ProgressEvent) => any) | null;
     addEventListener<K extends keyof XMLHttpRequestEventTargetEventMap>(type: K, listener: (this: XMLHttpRequestEventTarget, ev: XMLHttpRequestEventTargetEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
@@ -1664,7 +2531,12 @@ interface XMLHttpRequestEventTarget {
     removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
 }
 
-interface XMLHttpRequestUpload extends EventTarget, XMLHttpRequestEventTarget {
+declare var XMLHttpRequestEventTarget: {
+    prototype: XMLHttpRequestEventTarget;
+    new(): XMLHttpRequestEventTarget;
+};
+
+interface XMLHttpRequestUpload extends XMLHttpRequestEventTarget {
     addEventListener<K extends keyof XMLHttpRequestEventTargetEventMap>(type: K, listener: (this: XMLHttpRequestUpload, ev: XMLHttpRequestEventTargetEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
     addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
     removeEventListener<K extends keyof XMLHttpRequestEventTargetEventMap>(type: K, listener: (this: XMLHttpRequestUpload, ev: XMLHttpRequestEventTargetEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
@@ -1678,36 +2550,12 @@ declare var XMLHttpRequestUpload: {
 
 declare type EventListenerOrEventListenerObject = EventListener | EventListenerObject;
 
-interface DecodeErrorCallback {
-    (error: DOMException): void;
+interface EventHandlerNonNull {
+    (event: Event): any;
 }
 
-interface DecodeSuccessCallback {
-    (decodedData: AudioBuffer): void;
-}
-
-interface ErrorEventHandler {
-    (event: Event | string, source?: string, fileno?: number, columnNumber?: number, error?: Error): void;
-}
-
-interface ForEachCallback {
-    (keyId: Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | null, status: MediaKeyStatus): void;
-}
-
-interface FunctionStringCallback {
-    (data: string): void;
-}
-
-interface NotificationPermissionCallback {
-    (permission: NotificationPermission): void;
-}
-
-interface PositionCallback {
-    (position: Position): void;
-}
-
-interface PositionErrorCallback {
-    (error: PositionError): void;
+interface PerformanceObserverCallback {
+    (entries: PerformanceObserverEntryList, observer: PerformanceObserver): void;
 }
 
 declare var onmessage: ((this: DedicatedWorkerGlobalScope, ev: MessageEvent) => any) | null;
@@ -1730,7 +2578,6 @@ declare var navigator: WorkerNavigator;
 declare function clearImmediate(handle: number): void;
 declare function clearInterval(handle: number): void;
 declare function clearTimeout(handle: number): void;
-declare function importScripts(...urls: string[]): void;
 declare function setImmediate(handler: any, ...args: any[]): number;
 declare function setInterval(handler: any, timeout?: any, ...args: any[]): number;
 declare function setTimeout(handler: any, timeout?: any, ...args: any[]): number;
@@ -1742,52 +2589,37 @@ declare function addEventListener<K extends keyof DedicatedWorkerGlobalScopeEven
 declare function addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
 declare function removeEventListener<K extends keyof DedicatedWorkerGlobalScopeEventMap>(type: K, listener: (this: DedicatedWorkerGlobalScope, ev: DedicatedWorkerGlobalScopeEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
 declare function removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
-type FormDataEntryValue = string | File;
-type HeadersInit = Headers | string[][] | { [key: string]: string };
-type AlgorithmIdentifier = string | Algorithm;
-type AAGUID = string;
-type BodyInit = any;
-type ByteString = string;
-type CryptoOperationData = ArrayBufferView;
-type GLbitfield = number;
-type GLboolean = boolean;
-type GLbyte = number;
-type GLclampf = number;
-type GLenum = number;
-type GLfloat = number;
-type GLint = number;
-type GLintptr = number;
-type GLshort = number;
-type GLsizei = number;
-type GLsizeiptr = number;
-type GLubyte = number;
-type GLuint = number;
-type GLushort = number;
-type IDBKeyPath = string;
+type BlobPart = BufferSource | Blob | string;
+type HeadersInit = Headers | string[][] | Record<string, string>;
+type BodyInit = Blob | BufferSource | FormData | URLSearchParams | ReadableStream | string;
 type RequestInfo = Request | string;
-type USVString = string;
-type payloadtype = number;
-type ClientTypes = "window" | "worker" | "sharedworker" | "all";
+type DOMHighResTimeStamp = number;
+type PerformanceEntryList = PerformanceEntry[];
+type PushMessageDataInit = BufferSource | string;
+type VibratePattern = number | number[];
+type BufferSource = ArrayBufferView | ArrayBuffer;
+type DOMTimeStamp = number;
+type FormDataEntryValue = File | string;
+type IDBValidKey = number | string | Date | BufferSource | IDBArrayKey;
+type MessageEventSource = object | MessagePort | ServiceWorker;
 type BinaryType = "blob" | "arraybuffer";
+type ClientTypes = "window" | "worker" | "sharedworker" | "all";
 type IDBCursorDirection = "next" | "nextunique" | "prev" | "prevunique";
 type IDBRequestReadyState = "pending" | "done";
 type IDBTransactionMode = "readonly" | "readwrite" | "versionchange";
-type KeyFormat = "raw" | "spki" | "pkcs8" | "jwk";
-type KeyType = "public" | "private" | "secret";
-type KeyUsage = "encrypt" | "decrypt" | "sign" | "verify" | "deriveKey" | "deriveBits" | "wrapKey" | "unwrapKey";
-type MediaKeyStatus = "usable" | "expired" | "output-downscaled" | "output-not-allowed" | "status-pending" | "internal-error";
 type NotificationDirection = "auto" | "ltr" | "rtl";
 type NotificationPermission = "default" | "denied" | "granted";
 type PushEncryptionKeyName = "p256dh" | "auth";
-type PushPermissionState = "granted" | "denied" | "prompt";
+type PushPermissionState = "denied" | "granted" | "prompt";
 type ReferrerPolicy = "" | "no-referrer" | "no-referrer-when-downgrade" | "origin-only" | "origin-when-cross-origin" | "unsafe-url";
-type RequestCache = "default" | "no-store" | "reload" | "no-cache" | "force-cache";
+type RequestCache = "default" | "no-store" | "reload" | "no-cache" | "force-cache" | "only-if-cached";
 type RequestCredentials = "omit" | "same-origin" | "include";
-type RequestDestination = "" | "document" | "sharedworker" | "subresource" | "unknown" | "worker";
+type RequestDestination = "" | "audio" | "audioworklet" | "document" | "embed" | "font" | "image" | "manifest" | "object" | "paintworklet" | "report" | "script" | "sharedworker" | "style" | "track" | "video" | "worker" | "xslt";
 type RequestMode = "navigate" | "same-origin" | "no-cors" | "cors";
 type RequestRedirect = "follow" | "error" | "manual";
-type RequestType = "" | "audio" | "font" | "image" | "script" | "style" | "track" | "video";
 type ResponseType = "basic" | "cors" | "default" | "error" | "opaque" | "opaqueredirect";
 type ServiceWorkerState = "installing" | "installed" | "activating" | "activated" | "redundant";
+type ServiceWorkerUpdateViaCache = "imports" | "all" | "none";
 type VisibilityState = "hidden" | "visible" | "prerender" | "unloaded";
+type WorkerType = "classic" | "module";
 type XMLHttpRequestResponseType = "" | "arraybuffer" | "blob" | "document" | "json" | "text";
\ No newline at end of file
diff --git a/lib/lib.webworker.importscripts.d.ts b/lib/lib.webworker.importscripts.d.ts
new file mode 100644
index 00000000000..c373ba82a2f
--- /dev/null
+++ b/lib/lib.webworker.importscripts.d.ts
@@ -0,0 +1,26 @@
+/*! *****************************************************************************
+Copyright (c) Microsoft Corporation. All rights reserved. 
+Licensed under the Apache License, Version 2.0 (the "License"); you may not use
+this file except in compliance with the License. You may obtain a copy of the
+License at http://www.apache.org/licenses/LICENSE-2.0  
+ 
+THIS CODE IS PROVIDED ON AN *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
+WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE, 
+MERCHANTABLITY OR NON-INFRINGEMENT. 
+ 
+See the Apache Version 2.0 License for specific language governing permissions
+and limitations under the License.
+***************************************************************************** */
+
+
+
+/// <reference no-default-lib="true"/>
+
+
+
+/////////////////////////////
+/// WorkerGlobalScope APIs
+/////////////////////////////
+// These are only available in a Web Worker
+declare function importScripts(...urls: string[]): void;
diff --git a/lib/pl/diagnosticMessages.generated.json b/lib/pl/diagnosticMessages.generated.json
index f2891354fe4..45d329959eb 100644
--- a/lib/pl/diagnosticMessages.generated.json
+++ b/lib/pl/diagnosticMessages.generated.json
@@ -208,6 +208,8 @@
   "Cannot_find_a_tsconfig_json_file_at_the_specified_directory_Colon_0_5057": "Nie można znaleźć pliku tsconfig.json w określonym katalogu: „{0}”.",
   "Cannot_find_global_type_0_2318": "Nie można odnaleźć typu globalnego „{0}”.",
   "Cannot_find_global_value_0_2468": "Nie można odnaleźć wartości globalnej „{0}”.",
+  "Cannot_find_lib_definition_for_0_2726": "Cannot find lib definition for '{0}'.",
+  "Cannot_find_lib_definition_for_0_Did_you_mean_1_2727": "Cannot find lib definition for '{0}'. Did you mean '{1}'?",
   "Cannot_find_module_0_2307": "Nie można odnaleźć modułu „{0}”.",
   "Cannot_find_name_0_2304": "Nie można odnaleźć nazwy „{0}”.",
   "Cannot_find_name_0_Did_you_mean_1_2552": "Nie można znaleźć nazwy „{0}”. Czy chodziło Ci o „{1}”?",
@@ -941,6 +943,7 @@
   "Unexpected_end_of_text_1126": "Nieoczekiwany koniec tekstu.",
   "Unexpected_token_1012": "Nieoczekiwany token.",
   "Unexpected_token_A_constructor_method_accessor_or_property_was_expected_1068": "Nieoczekiwany token. Oczekiwano konstruktora, metody, metody dostępu lub właściwości.",
+  "Unexpected_token_A_type_parameter_name_was_expected_without_curly_braces_1069": "Nieoczekiwany token. Oczekiwano nazwy parametru typu bez nawiasów klamrowych.",
   "Unexpected_token_expected_1179": "Nieoczekiwany token. Oczekiwano znaku „{”.",
   "Unknown_compiler_option_0_5023": "Nieznana opcja kompilatora „{0}”.",
   "Unknown_option_excludes_Did_you_mean_exclude_6114": "Nieznana opcja „excludes”. Czy chodziło o „exclude”?",
diff --git a/lib/protocol.d.ts b/lib/protocol.d.ts
index b75a2c10e52..05f108613a9 100644
--- a/lib/protocol.d.ts
+++ b/lib/protocol.d.ts
@@ -2005,6 +2005,7 @@ declare namespace ts.server.protocol {
         kind: ScriptElementKind;
         kindModifiers: string;
         spans: TextSpan[];
+        nameSpan: TextSpan | undefined;
         childItems?: NavigationTree[];
     }
     type TelemetryEventName = "telemetry";
diff --git a/lib/pt-br/diagnosticMessages.generated.json b/lib/pt-br/diagnosticMessages.generated.json
index e4a7dfc1ee6..adf2f83faf5 100644
--- a/lib/pt-br/diagnosticMessages.generated.json
+++ b/lib/pt-br/diagnosticMessages.generated.json
@@ -208,6 +208,8 @@
   "Cannot_find_a_tsconfig_json_file_at_the_specified_directory_Colon_0_5057": "Não é possível encontrar um arquivo tsconfig.json no diretório especificado: '{0}'.",
   "Cannot_find_global_type_0_2318": "Não é possível encontrar o tipo global '{0}'.",
   "Cannot_find_global_value_0_2468": "Não é possível encontrar o valor global '{0}'.",
+  "Cannot_find_lib_definition_for_0_2726": "Cannot find lib definition for '{0}'.",
+  "Cannot_find_lib_definition_for_0_Did_you_mean_1_2727": "Cannot find lib definition for '{0}'. Did you mean '{1}'?",
   "Cannot_find_module_0_2307": "Não é possível encontrar o módulo '{0}'.",
   "Cannot_find_name_0_2304": "Não é possível encontrar o nome '{0}'.",
   "Cannot_find_name_0_Did_you_mean_1_2552": "Não é possível localizar o nome '{0}'. Você quis dizer '{1}'?",
@@ -941,6 +943,7 @@
   "Unexpected_end_of_text_1126": "Fim inesperado do texto.",
   "Unexpected_token_1012": "Token inesperado.",
   "Unexpected_token_A_constructor_method_accessor_or_property_was_expected_1068": "Token inesperado. Um construtor, método, acessador ou propriedade era esperado.",
+  "Unexpected_token_A_type_parameter_name_was_expected_without_curly_braces_1069": "Token inesperado. Um nome de parâmetro de tipo era esperado sem chaves.",
   "Unexpected_token_expected_1179": "Token inesperado. '{' esperado.",
   "Unknown_compiler_option_0_5023": "Opção do compilador '{0}' desconhecida.",
   "Unknown_option_excludes_Did_you_mean_exclude_6114": "Opção desconhecida 'excludes'. Você quis dizer 'exclude'?",
diff --git a/lib/ru/diagnosticMessages.generated.json b/lib/ru/diagnosticMessages.generated.json
index fbae0dbc63a..4e055070394 100644
--- a/lib/ru/diagnosticMessages.generated.json
+++ b/lib/ru/diagnosticMessages.generated.json
@@ -208,6 +208,8 @@
   "Cannot_find_a_tsconfig_json_file_at_the_specified_directory_Colon_0_5057": "Не удается найти файл tsconfig.json в указанном каталоге: \"{0}\".",
   "Cannot_find_global_type_0_2318": "Не удается найти глобальный тип \"{0}\".",
   "Cannot_find_global_value_0_2468": "Не удается найти глобальное значение \"{0}\".",
+  "Cannot_find_lib_definition_for_0_2726": "Cannot find lib definition for '{0}'.",
+  "Cannot_find_lib_definition_for_0_Did_you_mean_1_2727": "Cannot find lib definition for '{0}'. Did you mean '{1}'?",
   "Cannot_find_module_0_2307": "Не удается найти модуль \"{0}\".",
   "Cannot_find_name_0_2304": "Не удается найти имя \"{0}\".",
   "Cannot_find_name_0_Did_you_mean_1_2552": "Не удается найти имя \"{0}\". Вы имели в виду \"{1}\"?",
@@ -941,6 +943,7 @@
   "Unexpected_end_of_text_1126": "Неожиданный конец текста.",
   "Unexpected_token_1012": "Неожиданный токен.",
   "Unexpected_token_A_constructor_method_accessor_or_property_was_expected_1068": "Неожиданный токен. Ожидался конструктор, метод, метод доступа или свойство.",
+  "Unexpected_token_A_type_parameter_name_was_expected_without_curly_braces_1069": "Непредвиденная лексема. Ожидалось имя параметра типа без фигурных скобок.",
   "Unexpected_token_expected_1179": "Неожиданный токен. Ожидался символ \"{\".",
   "Unknown_compiler_option_0_5023": "Неизвестный параметр компилятора \"{0}\".",
   "Unknown_option_excludes_Did_you_mean_exclude_6114": "Неизвестный параметр excludes. Возможно, вы имели в виду exclude?",
diff --git a/lib/tr/diagnosticMessages.generated.json b/lib/tr/diagnosticMessages.generated.json
index 7ebbf4a0622..6be3f3b5a59 100644
--- a/lib/tr/diagnosticMessages.generated.json
+++ b/lib/tr/diagnosticMessages.generated.json
@@ -208,6 +208,8 @@
   "Cannot_find_a_tsconfig_json_file_at_the_specified_directory_Colon_0_5057": "Belirtilen dizinde tsconfig.json dosyası bulunamıyor: '{0}'.",
   "Cannot_find_global_type_0_2318": "'{0}' genel türü bulunamıyor.",
   "Cannot_find_global_value_0_2468": "'{0}' genel değeri bulunamıyor.",
+  "Cannot_find_lib_definition_for_0_2726": "Cannot find lib definition for '{0}'.",
+  "Cannot_find_lib_definition_for_0_Did_you_mean_1_2727": "Cannot find lib definition for '{0}'. Did you mean '{1}'?",
   "Cannot_find_module_0_2307": "'{0}' modülü bulunamıyor.",
   "Cannot_find_name_0_2304": "'{0}' adı bulunamıyor.",
   "Cannot_find_name_0_Did_you_mean_1_2552": "'{0}' adı bulunamıyor. Bunu mu demek istediniz: '{1}'?",
@@ -282,6 +284,8 @@
   "Convert_all_to_default_imports_95035": "Tümünü varsayılan içeri aktarmalara dönüştür",
   "Convert_function_0_to_class_95002": "'{0}' işlevini sınıfa dönüştür",
   "Convert_function_to_an_ES2015_class_95001": "İşlevi bir ES2015 sınıfına dönüştür",
+  "Convert_named_imports_to_namespace_import_95057": "Adlandırılmış içeri aktarmaları ad alanı içeri aktarmasına dönüştür",
+  "Convert_namespace_import_to_named_imports_95056": "Ad alanı içeri aktarmasını adlandırılmış içeri aktarmalara dönüştür",
   "Convert_require_to_import_95047": "'require' öğesini 'import' olarak dönüştür",
   "Convert_to_ES6_module_95017": "ES6 modülüne dönüştür",
   "Convert_to_default_import_95013": "Varsayılan içeri aktarmaya dönüştür",
@@ -584,6 +588,7 @@
   "Not_all_code_paths_return_a_value_7030": "Tüm kod yolları bir değer döndürmez.",
   "Numeric_index_type_0_is_not_assignable_to_string_index_type_1_2413": "'{0}' sayısal dizin türü, '{1}' dize dizini türüne atanamaz.",
   "Numeric_separators_are_not_allowed_here_6188": "Burada sayısal ayırıcılara izin verilmez.",
+  "Object_is_of_type_unknown_2571": "Nesne 'unknown' türünde.",
   "Object_is_possibly_null_2531": "Nesne büyük olasılıkla 'null'.",
   "Object_is_possibly_null_or_undefined_2533": "Nesne büyük olasılıkla 'null' veya 'undefined'.",
   "Object_is_possibly_undefined_2532": "Nesne büyük olasılıkla 'undefined'.",
@@ -938,6 +943,7 @@
   "Unexpected_end_of_text_1126": "Beklenmeyen metin sonu.",
   "Unexpected_token_1012": "Beklenmeyen belirteç.",
   "Unexpected_token_A_constructor_method_accessor_or_property_was_expected_1068": "Beklenmeyen belirteç. Bir oluşturucu, metot, erişimci veya özellik bekleniyordu.",
+  "Unexpected_token_A_type_parameter_name_was_expected_without_curly_braces_1069": "Beklenmeyen belirteç. Küme ayracı olmadan bir tür parametresi adı bekleniyordu.",
   "Unexpected_token_expected_1179": "Beklenmeyen belirteç. '{' bekleniyordu.",
   "Unknown_compiler_option_0_5023": "Bilinmeyen '{0}' derleyici seçeneği.",
   "Unknown_option_excludes_Did_you_mean_exclude_6114": "'Excludes' seçeneği bilinmiyor. 'Exclude' seçeneğini mi belirtmek istediniz?",
diff --git a/lib/tsc.js b/lib/tsc.js
index bed2ef28383..1d46247b150 100644
--- a/lib/tsc.js
+++ b/lib/tsc.js
@@ -13,120 +13,30 @@ See the Apache Version 2.0 License for specific language governing permissions
 and limitations under the License.
 ***************************************************************************** */
 
-"use strict";
-var __assign = (this && this.__assign) || Object.assign || function(t) {
-    for (var s, i = 1, n = arguments.length; i < n; i++) {
-        s = arguments[i];
-        for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
-            t[p] = s[p];
-    }
-    return t;
-};
-var __makeTemplateObject = (this && this.__makeTemplateObject) || function (cooked, raw) {
-    if (Object.defineProperty) { Object.defineProperty(cooked, "raw", { value: raw }); } else { cooked.raw = raw; }
-    return cooked;
-};
-var ts;
-(function (ts) {
-    var OperationCanceledException = (function () {
-        function OperationCanceledException() {
-        }
-        return OperationCanceledException;
-    }());
-    ts.OperationCanceledException = OperationCanceledException;
-    var ExitStatus;
-    (function (ExitStatus) {
-        ExitStatus[ExitStatus["Success"] = 0] = "Success";
-        ExitStatus[ExitStatus["DiagnosticsPresent_OutputsSkipped"] = 1] = "DiagnosticsPresent_OutputsSkipped";
-        ExitStatus[ExitStatus["DiagnosticsPresent_OutputsGenerated"] = 2] = "DiagnosticsPresent_OutputsGenerated";
-    })(ExitStatus = ts.ExitStatus || (ts.ExitStatus = {}));
-    var TypeReferenceSerializationKind;
-    (function (TypeReferenceSerializationKind) {
-        TypeReferenceSerializationKind[TypeReferenceSerializationKind["Unknown"] = 0] = "Unknown";
-        TypeReferenceSerializationKind[TypeReferenceSerializationKind["TypeWithConstructSignatureAndValue"] = 1] = "TypeWithConstructSignatureAndValue";
-        TypeReferenceSerializationKind[TypeReferenceSerializationKind["VoidNullableOrNeverType"] = 2] = "VoidNullableOrNeverType";
-        TypeReferenceSerializationKind[TypeReferenceSerializationKind["NumberLikeType"] = 3] = "NumberLikeType";
-        TypeReferenceSerializationKind[TypeReferenceSerializationKind["StringLikeType"] = 4] = "StringLikeType";
-        TypeReferenceSerializationKind[TypeReferenceSerializationKind["BooleanType"] = 5] = "BooleanType";
-        TypeReferenceSerializationKind[TypeReferenceSerializationKind["ArrayLikeType"] = 6] = "ArrayLikeType";
-        TypeReferenceSerializationKind[TypeReferenceSerializationKind["ESSymbolType"] = 7] = "ESSymbolType";
-        TypeReferenceSerializationKind[TypeReferenceSerializationKind["Promise"] = 8] = "Promise";
-        TypeReferenceSerializationKind[TypeReferenceSerializationKind["TypeWithCallSignature"] = 9] = "TypeWithCallSignature";
-        TypeReferenceSerializationKind[TypeReferenceSerializationKind["ObjectType"] = 10] = "ObjectType";
-    })(TypeReferenceSerializationKind = ts.TypeReferenceSerializationKind || (ts.TypeReferenceSerializationKind = {}));
-    var DiagnosticCategory;
-    (function (DiagnosticCategory) {
-        DiagnosticCategory[DiagnosticCategory["Warning"] = 0] = "Warning";
-        DiagnosticCategory[DiagnosticCategory["Error"] = 1] = "Error";
-        DiagnosticCategory[DiagnosticCategory["Suggestion"] = 2] = "Suggestion";
-        DiagnosticCategory[DiagnosticCategory["Message"] = 3] = "Message";
-    })(DiagnosticCategory = ts.DiagnosticCategory || (ts.DiagnosticCategory = {}));
-    function diagnosticCategoryName(d, lowerCase) {
-        if (lowerCase === void 0) { lowerCase = true; }
-        var name = DiagnosticCategory[d.category];
-        return lowerCase ? name.toLowerCase() : name;
-    }
-    ts.diagnosticCategoryName = diagnosticCategoryName;
-    var ModuleResolutionKind;
-    (function (ModuleResolutionKind) {
-        ModuleResolutionKind[ModuleResolutionKind["Classic"] = 1] = "Classic";
-        ModuleResolutionKind[ModuleResolutionKind["NodeJs"] = 2] = "NodeJs";
-    })(ModuleResolutionKind = ts.ModuleResolutionKind || (ts.ModuleResolutionKind = {}));
-    var ModuleKind;
-    (function (ModuleKind) {
-        ModuleKind[ModuleKind["None"] = 0] = "None";
-        ModuleKind[ModuleKind["CommonJS"] = 1] = "CommonJS";
-        ModuleKind[ModuleKind["AMD"] = 2] = "AMD";
-        ModuleKind[ModuleKind["UMD"] = 3] = "UMD";
-        ModuleKind[ModuleKind["System"] = 4] = "System";
-        ModuleKind[ModuleKind["ES2015"] = 5] = "ES2015";
-        ModuleKind[ModuleKind["ESNext"] = 6] = "ESNext";
-    })(ModuleKind = ts.ModuleKind || (ts.ModuleKind = {}));
-    function _contextuallyTypePragmas(args) {
-        return args;
-    }
-    ts.commentPragmas = _contextuallyTypePragmas({
-        "reference": {
-            args: [
-                { name: "types", optional: true, captureSpan: true },
-                { name: "path", optional: true, captureSpan: true },
-                { name: "no-default-lib", optional: true }
-            ],
-            kind: 1
-        },
-        "amd-dependency": {
-            args: [{ name: "path" }, { name: "name", optional: true }],
-            kind: 1
-        },
-        "amd-module": {
-            args: [{ name: "name" }],
-            kind: 1
-        },
-        "ts-check": {
-            kind: 2
-        },
-        "ts-nocheck": {
-            kind: 2
-        },
-        "jsx": {
-            args: [{ name: "factory" }],
-            kind: 4
-        },
-    });
-})(ts || (ts = {}));
+"use strict";"use strict";
+/*@internal*/
 var ts;
 (function (ts) {
+    /** Gets a timestamp with (at least) ms resolution */
     ts.timestamp = typeof performance !== "undefined" && performance.now ? function () { return performance.now(); } : Date.now ? Date.now : function () { return +(new Date()); };
 })(ts || (ts = {}));
+/*@internal*/
+/** Performance measurements for the compiler. */
 (function (ts) {
     var performance;
     (function (performance) {
+        // NOTE: cannot use ts.noop as core.ts loads after this
         var profilerEvent = typeof onProfilerEvent === "function" && onProfilerEvent.profiler === true ? onProfilerEvent : function () { };
         var enabled = false;
         var profilerStart = 0;
         var counts;
         var marks;
         var measures;
+        /**
+         * Marks a performance event.
+         *
+         * @param markName The name of the mark.
+         */
         function mark(markName) {
             if (enabled) {
                 marks.set(markName, ts.timestamp());
@@ -135,6 +45,15 @@ var ts;
             }
         }
         performance.mark = mark;
+        /**
+         * Adds a performance measurement with the specified name.
+         *
+         * @param measureName The name of the performance measurement.
+         * @param startMarkName The name of the starting mark. If not supplied, the point at which the
+         *      profiler was enabled is used.
+         * @param endMarkName The name of the ending mark. If not supplied, the current timestamp is
+         *      used.
+         */
         function measure(measureName, startMarkName, endMarkName) {
             if (enabled) {
                 var end = endMarkName && marks.get(endMarkName) || ts.timestamp();
@@ -143,20 +62,36 @@ var ts;
             }
         }
         performance.measure = measure;
+        /**
+         * Gets the number of times a marker was encountered.
+         *
+         * @param markName The name of the mark.
+         */
         function getCount(markName) {
             return counts && counts.get(markName) || 0;
         }
         performance.getCount = getCount;
+        /**
+         * Gets the total duration of all measurements with the supplied name.
+         *
+         * @param measureName The name of the measure whose durations should be accumulated.
+         */
         function getDuration(measureName) {
             return measures && measures.get(measureName) || 0;
         }
         performance.getDuration = getDuration;
+        /**
+         * Iterate over each measure, performing some action
+         *
+         * @param cb The action to perform for each measure
+         */
         function forEachMeasure(cb) {
             measures.forEach(function (measure, key) {
                 cb(key, measure);
             });
         }
         performance.forEachMeasure = forEachMeasure;
+        /** Enables (and resets) performance measurements for the compiler. */
         function enable() {
             counts = ts.createMap();
             marks = ts.createMap();
@@ -165,6 +100,7 @@ var ts;
             profilerStart = ts.timestamp();
         }
         performance.enable = enable;
+        /** Disables performance measurements for the compiler. */
         function disable() {
             enabled = false;
         }
@@ -173,52 +109,48 @@ var ts;
 })(ts || (ts = {}));
 var ts;
 (function (ts) {
+    // WARNING: The script `configureNightly.ts` uses a regexp to parse out these values.
+    // If changing the text in this section, be sure to test `configureNightly` too.
     ts.versionMajorMinor = "3.0";
+    /** The version of the TypeScript compiler release */
     ts.version = ts.versionMajorMinor + ".0-dev";
 })(ts || (ts = {}));
+/* @internal */
 (function (ts) {
-    function isExternalModuleNameRelative(moduleName) {
-        return ts.pathIsRelative(moduleName) || ts.isRootedDiskPath(moduleName);
-    }
-    ts.isExternalModuleNameRelative = isExternalModuleNameRelative;
-    function sortAndDeduplicateDiagnostics(diagnostics) {
-        return ts.sortAndDeduplicate(diagnostics, ts.compareDiagnostics);
-    }
-    ts.sortAndDeduplicateDiagnostics = sortAndDeduplicateDiagnostics;
-})(ts || (ts = {}));
-(function (ts) {
-    ts.emptyArray = [];
-    function closeFileWatcher(watcher) {
-        watcher.close();
-    }
-    ts.closeFileWatcher = closeFileWatcher;
+    var Comparison;
+    (function (Comparison) {
+        Comparison[Comparison["LessThan"] = -1] = "LessThan";
+        Comparison[Comparison["EqualTo"] = 0] = "EqualTo";
+        Comparison[Comparison["GreaterThan"] = 1] = "GreaterThan";
+    })(Comparison = ts.Comparison || (ts.Comparison = {}));
+    /** Create a MapLike with good performance. */
     function createDictionaryObject() {
-        var map = Object.create(null);
+        var map = Object.create(/*prototype*/ null); // tslint:disable-line:no-null-keyword
+        // Using 'delete' on an object causes V8 to put the object in dictionary mode.
+        // This disables creation of hidden classes, which are expensive when an object is
+        // constantly changing shape.
         map.__ = undefined;
         delete map.__;
         return map;
     }
+    /** Create a new map. If a template object is provided, the map will copy entries from it. */
     function createMap() {
-        return new MapCtr();
+        return new ts.MapCtr();
     }
     ts.createMap = createMap;
-    function createUnderscoreEscapedMap() {
-        return new MapCtr();
-    }
-    ts.createUnderscoreEscapedMap = createUnderscoreEscapedMap;
-    function createSymbolTable(symbols) {
-        var result = createMap();
-        if (symbols) {
-            for (var _i = 0, symbols_1 = symbols; _i < symbols_1.length; _i++) {
-                var symbol = symbols_1[_i];
-                result.set(symbol.escapedName, symbol);
-            }
+    function createMapFromEntries(entries) {
+        var map = createMap();
+        for (var _i = 0, entries_1 = entries; _i < entries_1.length; _i++) {
+            var _a = entries_1[_i], key = _a[0], value = _a[1];
+            map.set(key, value);
         }
-        return result;
+        return map;
     }
-    ts.createSymbolTable = createSymbolTable;
+    ts.createMapFromEntries = createMapFromEntries;
     function createMapFromTemplate(template) {
-        var map = new MapCtr();
+        var map = new ts.MapCtr();
+        // Copies keys/values from template. Note that for..in will not throw if
+        // template is undefined, and instead will just exit the loop.
         for (var key in template) {
             if (hasOwnProperty.call(template, key)) {
                 map.set(key, template[key]);
@@ -227,9 +159,12 @@ var ts;
         return map;
     }
     ts.createMapFromTemplate = createMapFromTemplate;
-    var MapCtr = typeof Map !== "undefined" && "entries" in Map.prototype ? Map : shimMap();
+    // Internet Explorer's Map doesn't support iteration, so don't use it.
+    // tslint:disable-next-line no-in-operator variable-name
+    ts.MapCtr = typeof Map !== "undefined" && "entries" in Map.prototype ? Map : shimMap();
+    // Keep the class inside a function so it doesn't get compiled if it's not used.
     function shimMap() {
-        var MapIterator = (function () {
+        var MapIterator = /** @class */ (function () {
             function MapIterator(data, selector) {
                 this.index = 0;
                 this.data = data;
@@ -246,7 +181,7 @@ var ts;
             };
             return MapIterator;
         }());
-        return (function () {
+        return /** @class */ (function () {
             function class_1() {
                 this.data = createDictionaryObject();
                 this.size = 0;
@@ -262,6 +197,7 @@ var ts;
                 return this;
             };
             class_1.prototype.has = function (key) {
+                // tslint:disable-next-line:no-in-operator
                 return key in this.data;
             };
             class_1.prototype.delete = function (key) {
@@ -293,21 +229,15 @@ var ts;
             return class_1;
         }());
     }
-    function toPath(fileName, basePath, getCanonicalFileName) {
-        var nonCanonicalizedPath = isRootedDiskPath(fileName)
-            ? normalizePath(fileName)
-            : getNormalizedAbsolutePath(fileName, basePath);
-        return getCanonicalFileName(nonCanonicalizedPath);
-    }
-    ts.toPath = toPath;
     function length(array) {
         return array ? array.length : 0;
     }
     ts.length = length;
-    function hasEntries(map) {
-        return !!map && !!map.size;
-    }
-    ts.hasEntries = hasEntries;
+    /**
+     * Iterates through 'array' by index and performs the callback on each element of array until the callback
+     * returns a truthy value, then returns that value.
+     * If no such value is found, the callback is applied to each element of array and undefined is returned.
+     */
     function forEach(array, callback) {
         if (array) {
             for (var i = 0; i < array.length; i++) {
@@ -320,6 +250,7 @@ var ts;
         return undefined;
     }
     ts.forEach = forEach;
+    /** Like `forEach`, but suitable for use with numbers and strings (which may be falsy). */
     function firstDefined(array, callback) {
         if (array === undefined) {
             return undefined;
@@ -346,20 +277,6 @@ var ts;
         }
     }
     ts.firstDefinedIterator = firstDefinedIterator;
-    function findAncestor(node, callback) {
-        while (node) {
-            var result = callback(node);
-            if (result === "quit") {
-                return undefined;
-            }
-            else if (result) {
-                return node;
-            }
-            node = node.parent;
-        }
-        return undefined;
-    }
-    ts.findAncestor = findAncestor;
     function zipWith(arrayA, arrayB, callback) {
         var result = [];
         Debug.assertEqual(arrayA.length, arrayB.length);
@@ -392,6 +309,11 @@ var ts;
         return map;
     }
     ts.zipToMap = zipToMap;
+    /**
+     * Iterates through `array` by index and performs the callback on each element of array until the callback
+     * returns a falsey value, then returns false.
+     * If no such value is found, the callback is applied to each element of array and `true` is returned.
+     */
     function every(array, callback) {
         if (array) {
             for (var i = 0; i < array.length; i++) {
@@ -423,6 +345,7 @@ var ts;
         return undefined;
     }
     ts.findLast = findLast;
+    /** Works like Array.prototype.findIndex, returning `-1` if no element satisfying the predicate is found. */
     function findIndex(array, predicate, startIndex) {
         for (var i = startIndex || 0; i < array.length; i++) {
             if (predicate(array[i], i)) {
@@ -441,6 +364,10 @@ var ts;
         return -1;
     }
     ts.findLastIndex = findLastIndex;
+    /**
+     * Returns the first truthy result of `callback`, or else fails.
+     * This is like `forEach`, but never returns undefined.
+     */
     function findMap(array, callback) {
         for (var i = 0; i < array.length; i++) {
             var result = callback(array[i], i);
@@ -771,6 +698,7 @@ var ts;
         return false;
     }
     ts.some = some;
+    /** Calls the callback with (start, afterEnd) index pairs for each range where 'pred' is true. */
     function getRangesWhere(arr, pred, cb) {
         var start;
         for (var i = 0; i < arr.length; i++) {
@@ -797,6 +725,8 @@ var ts;
     }
     ts.concatenate = concatenate;
     function deduplicateRelational(array, equalityComparer, comparer) {
+        // Perform a stable sort of the array. This ensures the first entry in a list of
+        // duplicates remains the first entry in the result.
         var indices = array.map(function (_, i) { return i; });
         stableSortIndices(array, indices, comparer);
         var last = array[indices[0]];
@@ -809,6 +739,7 @@ var ts;
                 last = item;
             }
         }
+        // restore original order
         deduplicated.sort();
         return deduplicated.map(function (i) { return array[i]; });
     }
@@ -838,10 +769,13 @@ var ts;
         for (var i = 1; i < array.length; i++) {
             var next = array[i];
             switch (comparer(next, last)) {
+                // equality comparison
                 case true:
-                case 0:
+                // relational comparison
+                case 0 /* EqualTo */:
                     continue;
-                case -1:
+                case -1 /* LessThan */:
+                    // If `array` is sorted, `next` should **never** be less than `last`.
                     return Debug.fail("Array is unsorted.");
             }
             deduplicated.push(last = next);
@@ -879,25 +813,6 @@ var ts;
         return true;
     }
     ts.arrayIsEqualTo = arrayIsEqualTo;
-    function changesAffectModuleResolution(oldOptions, newOptions) {
-        return !oldOptions ||
-            (oldOptions.module !== newOptions.module) ||
-            (oldOptions.moduleResolution !== newOptions.moduleResolution) ||
-            (oldOptions.noResolve !== newOptions.noResolve) ||
-            (oldOptions.target !== newOptions.target) ||
-            (oldOptions.noLib !== newOptions.noLib) ||
-            (oldOptions.jsx !== newOptions.jsx) ||
-            (oldOptions.allowJs !== newOptions.allowJs) ||
-            (oldOptions.rootDir !== newOptions.rootDir) ||
-            (oldOptions.configFilePath !== newOptions.configFilePath) ||
-            (oldOptions.baseUrl !== newOptions.baseUrl) ||
-            (oldOptions.maxNodeModuleJsDepth !== newOptions.maxNodeModuleJsDepth) ||
-            !arrayIsEqualTo(oldOptions.lib, newOptions.lib) ||
-            !arrayIsEqualTo(oldOptions.typeRoots, newOptions.typeRoots) ||
-            !arrayIsEqualTo(oldOptions.rootDirs, newOptions.rootDirs) ||
-            !equalOwnProperties(oldOptions.paths, newOptions.paths);
-    }
-    ts.changesAffectModuleResolution = changesAffectModuleResolution;
     function compact(array) {
         var result;
         if (array) {
@@ -916,25 +831,41 @@ var ts;
         return result || array;
     }
     ts.compact = compact;
+    /**
+     * Gets the relative complement of `arrayA` with respect to `arrayB`, returning the elements that
+     * are not present in `arrayA` but are present in `arrayB`. Assumes both arrays are sorted
+     * based on the provided comparer.
+     */
     function relativeComplement(arrayA, arrayB, comparer) {
         if (!arrayB || !arrayA || arrayB.length === 0 || arrayA.length === 0)
             return arrayB;
         var result = [];
         loopB: for (var offsetA = 0, offsetB = 0; offsetB < arrayB.length; offsetB++) {
             if (offsetB > 0) {
-                Debug.assertGreaterThanOrEqual(comparer(arrayB[offsetB], arrayB[offsetB - 1]), 0);
+                // Ensure `arrayB` is properly sorted.
+                Debug.assertGreaterThanOrEqual(comparer(arrayB[offsetB], arrayB[offsetB - 1]), 0 /* EqualTo */);
             }
             loopA: for (var startA = offsetA; offsetA < arrayA.length; offsetA++) {
                 if (offsetA > startA) {
-                    Debug.assertGreaterThanOrEqual(comparer(arrayA[offsetA], arrayA[offsetA - 1]), 0);
+                    // Ensure `arrayA` is properly sorted. We only need to perform this check if
+                    // `offsetA` has changed since we entered the loop.
+                    Debug.assertGreaterThanOrEqual(comparer(arrayA[offsetA], arrayA[offsetA - 1]), 0 /* EqualTo */);
                 }
                 switch (comparer(arrayB[offsetB], arrayA[offsetA])) {
-                    case -1:
+                    case -1 /* LessThan */:
+                        // If B is less than A, B does not exist in arrayA. Add B to the result and
+                        // move to the next element in arrayB without changing the current position
+                        // in arrayA.
                         result.push(arrayB[offsetB]);
                         continue loopB;
-                    case 0:
+                    case 0 /* EqualTo */:
+                        // If B is equal to A, B exists in arrayA. Move to the next element in
+                        // arrayB without adding B to the result or changing the current position
+                        // in arrayA.
                         continue loopB;
-                    case 1:
+                    case 1 /* GreaterThan */:
+                        // If B is greater than A, we need to keep looking for B in arrayA. Move to
+                        // the next element in arrayA and recheck.
                         continue loopA;
                 }
             }
@@ -960,6 +891,10 @@ var ts;
         return to;
     }
     ts.append = append;
+    /**
+     * Gets the actual offset into an array for a relative offset. Negative offsets indicate a
+     * position offset from the end of the array.
+     */
     function toOffset(array, offset) {
         return offset < 0 ? array.length + offset : offset;
     }
@@ -978,6 +913,9 @@ var ts;
         return to;
     }
     ts.addRange = addRange;
+    /**
+     * @return Whether the value was added.
+     */
     function pushIfUnique(array, toAdd, equalityComparer) {
         if (contains(array, toAdd, equalityComparer)) {
             return false;
@@ -988,6 +926,9 @@ var ts;
         }
     }
     ts.pushIfUnique = pushIfUnique;
+    /**
+     * Unlike `pushIfUnique`, this can take `undefined` as an input, and returns a new array.
+     */
     function appendIfUnique(array, toAdd, equalityComparer) {
         if (array) {
             pushIfUnique(array, toAdd, equalityComparer);
@@ -999,8 +940,12 @@ var ts;
     }
     ts.appendIfUnique = appendIfUnique;
     function stableSortIndices(array, indices, comparer) {
+        // sort indices by value then position
         indices.sort(function (x, y) { return comparer(array[x], array[y]) || compareValues(x, y); });
     }
+    /**
+     * Returns a new sorted array.
+     */
     function sort(array, comparer) {
         return array.slice().sort(comparer);
     }
@@ -1035,6 +980,9 @@ var ts;
             } };
     }
     ts.arrayIterator = arrayIterator;
+    /**
+     * Stable sort of an array. Elements equal to each other maintain their relative position in the array.
+     */
     function stableSort(array, comparer) {
         var indices = array.map(function (_, i) { return i; });
         stableSortIndices(array, indices, comparer);
@@ -1051,6 +999,10 @@ var ts;
         return true;
     }
     ts.rangeEquals = rangeEquals;
+    /**
+     * Returns the element at a specific offset in an array if non-empty, `undefined` otherwise.
+     * A negative offset indicates the element should be retrieved from the end of the array.
+     */
     function elementAt(array, offset) {
         if (array) {
             offset = toOffset(array, offset);
@@ -1061,6 +1013,9 @@ var ts;
         return undefined;
     }
     ts.elementAt = elementAt;
+    /**
+     * Returns the first element of an array if non-empty, `undefined` otherwise.
+     */
     function firstOrUndefined(array) {
         return array.length === 0 ? undefined : array[0];
     }
@@ -1070,6 +1025,9 @@ var ts;
         return array[0];
     }
     ts.first = first;
+    /**
+     * Returns the last element of an array if non-empty, `undefined` otherwise.
+     */
     function lastOrUndefined(array) {
         return array.length === 0 ? undefined : array[array.length - 1];
     }
@@ -1079,6 +1037,9 @@ var ts;
         return array[array.length - 1];
     }
     ts.last = last;
+    /**
+     * Returns the only element of an array if it contains only one element, `undefined` otherwise.
+     */
     function singleOrUndefined(array) {
         return array && array.length === 1
             ? array[0]
@@ -1097,6 +1058,17 @@ var ts;
         return result;
     }
     ts.replaceElement = replaceElement;
+    /**
+     * Performs a binary search, finding the index at which `value` occurs in `array`.
+     * If no such index is found, returns the 2's-complement of first index at which
+     * `array[index]` exceeds `value`.
+     * @param array A sorted array whose first element must be no larger than number
+     * @param value The value to be searched for in the array.
+     * @param keySelector A callback used to select the search key from `value` and each element of
+     * `array`.
+     * @param keyComparer A callback used to compare two keys in a sorted array.
+     * @param offset An offset into `array` at which to start the search.
+     */
     function binarySearch(array, value, keySelector, keyComparer, offset) {
         if (!array || array.length === 0) {
             return -1;
@@ -1108,12 +1080,12 @@ var ts;
             var middle = low + ((high - low) >> 1);
             var midKey = keySelector(array[middle]);
             switch (keyComparer(midKey, key)) {
-                case -1:
+                case -1 /* LessThan */:
                     low = middle + 1;
                     break;
-                case 0:
+                case 0 /* EqualTo */:
                     return middle;
-                case 1:
+                case 1 /* GreaterThan */:
                     high = middle - 1;
                     break;
             }
@@ -1146,14 +1118,29 @@ var ts;
     }
     ts.reduceLeft = reduceLeft;
     var hasOwnProperty = Object.prototype.hasOwnProperty;
+    /**
+     * Indicates whether a map-like contains an own property with the specified key.
+     *
+     * @param map A map-like.
+     * @param key A property key.
+     */
     function hasProperty(map, key) {
         return hasOwnProperty.call(map, key);
     }
     ts.hasProperty = hasProperty;
+    /**
+     * Gets the value of an owned property in a map-like.
+     *
+     * @param map A map-like.
+     * @param key A property key.
+     */
     function getProperty(map, key) {
         return hasOwnProperty.call(map, key) ? map[key] : undefined;
     }
     ts.getProperty = getProperty;
+    /**
+     * Gets the owned, enumerable property keys of a map-like.
+     */
     function getOwnKeys(map) {
         var keys = [];
         for (var key in map) {
@@ -1183,37 +1170,6 @@ var ts;
         return result;
     }
     ts.arrayFrom = arrayFrom;
-    function forEachEntry(map, callback) {
-        var _a;
-        var iterator = map.entries();
-        for (var _b = iterator.next(), pair = _b.value, done = _b.done; !done; _a = iterator.next(), pair = _a.value, done = _a.done, _a) {
-            var key = pair[0], value = pair[1];
-            var result = callback(value, key);
-            if (result) {
-                return result;
-            }
-        }
-        return undefined;
-    }
-    ts.forEachEntry = forEachEntry;
-    function forEachKey(map, callback) {
-        var _a;
-        var iterator = map.keys();
-        for (var _b = iterator.next(), key = _b.value, done = _b.done; !done; _a = iterator.next(), key = _a.value, done = _a.done, _a) {
-            var result = callback(key);
-            if (result) {
-                return result;
-            }
-        }
-        return undefined;
-    }
-    ts.forEachKey = forEachKey;
-    function copyEntries(source, target) {
-        source.forEach(function (value, key) {
-            target.set(key, value);
-        });
-    }
-    ts.copyEntries = copyEntries;
     function assign(t) {
         var args = [];
         for (var _i = 1; _i < arguments.length; _i++) {
@@ -1223,13 +1179,19 @@ var ts;
             var arg = args_1[_a];
             for (var p in arg) {
                 if (hasProperty(arg, p)) {
-                    t[p] = arg[p];
+                    t[p] = arg[p]; // TODO: GH#23368
                 }
             }
         }
         return t;
     }
     ts.assign = assign;
+    /**
+     * Performs a shallow equality comparison of the contents of two map-likes.
+     *
+     * @param left A map-like whose properties should be compared.
+     * @param right A map-like whose properties should be compared.
+     */
     function equalOwnProperties(left, right, equalityComparer) {
         if (equalityComparer === void 0) { equalityComparer = equateValues; }
         if (left === right)
@@ -1275,10 +1237,6 @@ var ts;
         return result;
     }
     ts.arrayToNumericMap = arrayToNumericMap;
-    function arrayToSet(array, makeKey) {
-        return arrayToMap(array, makeKey || (function (s) { return s; }), function () { return true; });
-    }
-    ts.arrayToSet = arrayToSet;
     function arrayToMultiMap(values, makeKey, makeValue) {
         if (makeValue === void 0) { makeValue = identity; }
         var result = createMultiMap();
@@ -1293,12 +1251,6 @@ var ts;
         return arrayFrom(arrayToMultiMap(values, getGroupId).values());
     }
     ts.group = group;
-    function cloneMap(map) {
-        var clone = createMap();
-        copyEntries(map, clone);
-        return clone;
-    }
-    ts.cloneMap = cloneMap;
     function clone(object) {
         var result = {};
         for (var id in object) {
@@ -1350,6 +1302,9 @@ var ts;
             }
         }
     }
+    /**
+     * Tests whether a value is an array.
+     */
     function isArray(value) {
         return Array.isArray ? Array.isArray(value) : value instanceof Array;
     }
@@ -1358,6 +1313,9 @@ var ts;
         return isArray(value) ? value : [value];
     }
     ts.toArray = toArray;
+    /**
+     * Tests whether a value is string
+     */
     function isString(text) {
         return typeof text === "string";
     }
@@ -1369,24 +1327,25 @@ var ts;
     function cast(value, test) {
         if (value !== undefined && test(value))
             return value;
-        if (value && typeof value.kind === "number") {
-            return Debug.fail("Invalid cast. The supplied " + Debug.showSyntaxKind(value) + " did not pass the test '" + Debug.getFunctionName(test) + "'.");
-        }
-        else {
-            return Debug.fail("Invalid cast. The supplied value did not pass the test '" + Debug.getFunctionName(test) + "'.");
-        }
+        return Debug.fail("Invalid cast. The supplied value " + value + " did not pass the test '" + Debug.getFunctionName(test) + "'.");
     }
     ts.cast = cast;
-    function noop(_) { }
+    /** Does nothing. */
+    function noop(_) { } // tslint:disable-line no-empty
     ts.noop = noop;
+    /** Do nothing and return false */
     function returnFalse() { return false; }
     ts.returnFalse = returnFalse;
+    /** Do nothing and return true */
     function returnTrue() { return true; }
     ts.returnTrue = returnTrue;
+    /** Returns its argument. */
     function identity(x) { return x; }
     ts.identity = identity;
+    /** Returns lower case string */
     function toLowerCase(x) { return x.toLowerCase(); }
     ts.toLowerCase = toLowerCase;
+    /** Throws an error because a function is not implemented. */
     function notImplemented() {
         throw new Error("Not implemented");
     }
@@ -1452,1110 +1411,16 @@ var ts;
         }
     }
     ts.compose = compose;
-    function formatStringFromArgs(text, args, baseIndex) {
-        if (baseIndex === void 0) { baseIndex = 0; }
-        return text.replace(/{(\d+)}/g, function (_match, index) { return Debug.assertDefined(args[+index + baseIndex]); });
-    }
-    ts.formatStringFromArgs = formatStringFromArgs;
-    function getLocaleSpecificMessage(message) {
-        return ts.localizedDiagnosticMessages && ts.localizedDiagnosticMessages[message.key] || message.message;
-    }
-    ts.getLocaleSpecificMessage = getLocaleSpecificMessage;
-    function createFileDiagnostic(file, start, length, message) {
-        Debug.assertGreaterThanOrEqual(start, 0);
-        Debug.assertGreaterThanOrEqual(length, 0);
-        if (file) {
-            Debug.assertLessThanOrEqual(start, file.text.length);
-            Debug.assertLessThanOrEqual(start + length, file.text.length);
-        }
-        var text = getLocaleSpecificMessage(message);
-        if (arguments.length > 4) {
-            text = formatStringFromArgs(text, arguments, 4);
-        }
-        return {
-            file: file,
-            start: start,
-            length: length,
-            messageText: text,
-            category: message.category,
-            code: message.code,
-            reportsUnnecessary: message.reportsUnnecessary,
-        };
-    }
-    ts.createFileDiagnostic = createFileDiagnostic;
-    function formatMessage(_dummy, message) {
-        var text = getLocaleSpecificMessage(message);
-        if (arguments.length > 2) {
-            text = formatStringFromArgs(text, arguments, 2);
-        }
-        return text;
-    }
-    ts.formatMessage = formatMessage;
-    function createCompilerDiagnostic(message) {
-        var text = getLocaleSpecificMessage(message);
-        if (arguments.length > 1) {
-            text = formatStringFromArgs(text, arguments, 1);
-        }
-        return {
-            file: undefined,
-            start: undefined,
-            length: undefined,
-            messageText: text,
-            category: message.category,
-            code: message.code,
-            reportsUnnecessary: message.reportsUnnecessary,
-        };
-    }
-    ts.createCompilerDiagnostic = createCompilerDiagnostic;
-    function createCompilerDiagnosticFromMessageChain(chain) {
-        return {
-            file: undefined,
-            start: undefined,
-            length: undefined,
-            code: chain.code,
-            category: chain.category,
-            messageText: chain.next ? chain : chain.messageText,
-        };
-    }
-    ts.createCompilerDiagnosticFromMessageChain = createCompilerDiagnosticFromMessageChain;
-    function chainDiagnosticMessages(details, message) {
-        var text = getLocaleSpecificMessage(message);
-        if (arguments.length > 2) {
-            text = formatStringFromArgs(text, arguments, 2);
-        }
-        return {
-            messageText: text,
-            category: message.category,
-            code: message.code,
-            next: details
-        };
-    }
-    ts.chainDiagnosticMessages = chainDiagnosticMessages;
-    function concatenateDiagnosticMessageChains(headChain, tailChain) {
-        var lastChain = headChain;
-        while (lastChain.next) {
-            lastChain = lastChain.next;
-        }
-        lastChain.next = tailChain;
-        return headChain;
-    }
-    ts.concatenateDiagnosticMessageChains = concatenateDiagnosticMessageChains;
-    function equateValues(a, b) {
-        return a === b;
-    }
-    ts.equateValues = equateValues;
-    function equateStringsCaseInsensitive(a, b) {
-        return a === b
-            || a !== undefined
-                && b !== undefined
-                && a.toUpperCase() === b.toUpperCase();
-    }
-    ts.equateStringsCaseInsensitive = equateStringsCaseInsensitive;
-    function equateStringsCaseSensitive(a, b) {
-        return equateValues(a, b);
-    }
-    ts.equateStringsCaseSensitive = equateStringsCaseSensitive;
-    function compareComparableValues(a, b) {
-        return a === b ? 0 :
-            a === undefined ? -1 :
-                b === undefined ? 1 :
-                    a < b ? -1 :
-                        1;
-    }
-    function compareValues(a, b) {
-        return compareComparableValues(a, b);
-    }
-    ts.compareValues = compareValues;
-    function min(a, b, compare) {
-        return compare(a, b) === -1 ? a : b;
-    }
-    ts.min = min;
-    function compareStringsCaseInsensitive(a, b) {
-        if (a === b)
-            return 0;
-        if (a === undefined)
-            return -1;
-        if (b === undefined)
-            return 1;
-        a = a.toUpperCase();
-        b = b.toUpperCase();
-        return a < b ? -1 : a > b ? 1 : 0;
-    }
-    ts.compareStringsCaseInsensitive = compareStringsCaseInsensitive;
-    function compareStringsCaseSensitive(a, b) {
-        return compareComparableValues(a, b);
-    }
-    ts.compareStringsCaseSensitive = compareStringsCaseSensitive;
-    function getStringComparer(ignoreCase) {
-        return ignoreCase ? compareStringsCaseInsensitive : compareStringsCaseSensitive;
-    }
-    ts.getStringComparer = getStringComparer;
-    var createUIStringComparer = (function () {
-        var defaultComparer;
-        var enUSComparer;
-        var stringComparerFactory = getStringComparerFactory();
-        return createStringComparer;
-        function compareWithCallback(a, b, comparer) {
-            if (a === b)
-                return 0;
-            if (a === undefined)
-                return -1;
-            if (b === undefined)
-                return 1;
-            var value = comparer(a, b);
-            return value < 0 ? -1 : value > 0 ? 1 : 0;
-        }
-        function createIntlCollatorStringComparer(locale) {
-            var comparer = new Intl.Collator(locale, { usage: "sort", sensitivity: "variant" }).compare;
-            return function (a, b) { return compareWithCallback(a, b, comparer); };
-        }
-        function createLocaleCompareStringComparer(locale) {
-            if (locale !== undefined)
-                return createFallbackStringComparer();
-            return function (a, b) { return compareWithCallback(a, b, compareStrings); };
-            function compareStrings(a, b) {
-                return a.localeCompare(b);
-            }
-        }
-        function createFallbackStringComparer() {
-            return function (a, b) { return compareWithCallback(a, b, compareDictionaryOrder); };
-            function compareDictionaryOrder(a, b) {
-                return compareStrings(a.toUpperCase(), b.toUpperCase()) || compareStrings(a, b);
-            }
-            function compareStrings(a, b) {
-                return a < b ? -1 : a > b ? 1 : 0;
-            }
-        }
-        function getStringComparerFactory() {
-            if (typeof Intl === "object" && typeof Intl.Collator === "function") {
-                return createIntlCollatorStringComparer;
-            }
-            if (typeof String.prototype.localeCompare === "function" &&
-                typeof String.prototype.toLocaleUpperCase === "function" &&
-                "a".localeCompare("B") < 0) {
-                return createLocaleCompareStringComparer;
-            }
-            return createFallbackStringComparer;
-        }
-        function createStringComparer(locale) {
-            if (locale === undefined) {
-                return defaultComparer || (defaultComparer = stringComparerFactory(locale));
-            }
-            else if (locale === "en-US") {
-                return enUSComparer || (enUSComparer = stringComparerFactory(locale));
-            }
-            else {
-                return stringComparerFactory(locale);
-            }
-        }
-    })();
-    var uiComparerCaseSensitive;
-    var uiLocale;
-    function getUILocale() {
-        return uiLocale;
-    }
-    ts.getUILocale = getUILocale;
-    function setUILocale(value) {
-        if (uiLocale !== value) {
-            uiLocale = value;
-            uiComparerCaseSensitive = undefined;
-        }
-    }
-    ts.setUILocale = setUILocale;
-    function compareStringsCaseSensitiveUI(a, b) {
-        var comparer = uiComparerCaseSensitive || (uiComparerCaseSensitive = createUIStringComparer(uiLocale));
-        return comparer(a, b);
-    }
-    ts.compareStringsCaseSensitiveUI = compareStringsCaseSensitiveUI;
-    function compareProperties(a, b, key, comparer) {
-        return a === b ? 0 :
-            a === undefined ? -1 :
-                b === undefined ? 1 :
-                    comparer(a[key], b[key]);
-    }
-    ts.compareProperties = compareProperties;
-    function getDiagnosticFilePath(diagnostic) {
-        return diagnostic.file ? diagnostic.file.path : undefined;
-    }
-    function compareDiagnostics(d1, d2) {
-        return compareStringsCaseSensitive(getDiagnosticFilePath(d1), getDiagnosticFilePath(d2)) ||
-            compareValues(d1.start, d2.start) ||
-            compareValues(d1.length, d2.length) ||
-            compareValues(d1.code, d2.code) ||
-            compareMessageText(d1.messageText, d2.messageText) ||
-            0;
-    }
-    ts.compareDiagnostics = compareDiagnostics;
-    function compareBooleans(a, b) {
-        return compareValues(a ? 1 : 0, b ? 1 : 0);
-    }
-    ts.compareBooleans = compareBooleans;
-    function compareMessageText(t1, t2) {
-        var text1 = t1;
-        var text2 = t2;
-        while (text1 && text2) {
-            var string1 = isString(text1) ? text1 : text1.messageText;
-            var string2 = isString(text2) ? text2 : text2.messageText;
-            var res = compareStringsCaseSensitive(string1, string2);
-            if (res) {
-                return res;
-            }
-            text1 = isString(text1) ? undefined : text1.next;
-            text2 = isString(text2) ? undefined : text2.next;
-        }
-        if (!text1 && !text2) {
-            return 0;
-        }
-        return text1 ? 1 : -1;
-    }
-    function getEmitScriptTarget(compilerOptions) {
-        return compilerOptions.target || 0;
-    }
-    ts.getEmitScriptTarget = getEmitScriptTarget;
-    function getEmitModuleKind(compilerOptions) {
-        return typeof compilerOptions.module === "number" ?
-            compilerOptions.module :
-            getEmitScriptTarget(compilerOptions) >= 2 ? ts.ModuleKind.ES2015 : ts.ModuleKind.CommonJS;
-    }
-    ts.getEmitModuleKind = getEmitModuleKind;
-    function getEmitModuleResolutionKind(compilerOptions) {
-        var moduleResolution = compilerOptions.moduleResolution;
-        if (moduleResolution === undefined) {
-            moduleResolution = getEmitModuleKind(compilerOptions) === ts.ModuleKind.CommonJS ? ts.ModuleResolutionKind.NodeJs : ts.ModuleResolutionKind.Classic;
-        }
-        return moduleResolution;
-    }
-    ts.getEmitModuleResolutionKind = getEmitModuleResolutionKind;
-    function unreachableCodeIsError(options) {
-        return options.allowUnreachableCode === false;
-    }
-    ts.unreachableCodeIsError = unreachableCodeIsError;
-    function unusedLabelIsError(options) {
-        return options.allowUnusedLabels === false;
-    }
-    ts.unusedLabelIsError = unusedLabelIsError;
-    function getAreDeclarationMapsEnabled(options) {
-        return !!(options.declaration && options.declarationMap);
-    }
-    ts.getAreDeclarationMapsEnabled = getAreDeclarationMapsEnabled;
-    function getAllowSyntheticDefaultImports(compilerOptions) {
-        var moduleKind = getEmitModuleKind(compilerOptions);
-        return compilerOptions.allowSyntheticDefaultImports !== undefined
-            ? compilerOptions.allowSyntheticDefaultImports
-            : compilerOptions.esModuleInterop
-                ? moduleKind !== ts.ModuleKind.None && moduleKind < ts.ModuleKind.ES2015
-                : moduleKind === ts.ModuleKind.System;
-    }
-    ts.getAllowSyntheticDefaultImports = getAllowSyntheticDefaultImports;
-    function getEmitDeclarations(compilerOptions) {
-        return !!(compilerOptions.declaration || compilerOptions.composite);
-    }
-    ts.getEmitDeclarations = getEmitDeclarations;
-    function getStrictOptionValue(compilerOptions, flag) {
-        return compilerOptions[flag] === undefined ? !!compilerOptions.strict : !!compilerOptions[flag];
-    }
-    ts.getStrictOptionValue = getStrictOptionValue;
-    function hasZeroOrOneAsteriskCharacter(str) {
-        var seenAsterisk = false;
-        for (var i = 0; i < str.length; i++) {
-            if (str.charCodeAt(i) === 42) {
-                if (!seenAsterisk) {
-                    seenAsterisk = true;
-                }
-                else {
-                    return false;
-                }
-            }
-        }
-        return true;
-    }
-    ts.hasZeroOrOneAsteriskCharacter = hasZeroOrOneAsteriskCharacter;
-    ts.directorySeparator = "/";
-    var altDirectorySeparator = "\\";
-    var urlSchemeSeparator = "://";
-    var backslashRegExp = /\\/g;
-    function normalizeSlashes(path) {
-        return path.replace(backslashRegExp, ts.directorySeparator);
-    }
-    ts.normalizeSlashes = normalizeSlashes;
-    function isVolumeCharacter(charCode) {
-        return (charCode >= 97 && charCode <= 122) ||
-            (charCode >= 65 && charCode <= 90);
-    }
-    function getFileUrlVolumeSeparatorEnd(url, start) {
-        var ch0 = url.charCodeAt(start);
-        if (ch0 === 58)
-            return start + 1;
-        if (ch0 === 37 && url.charCodeAt(start + 1) === 51) {
-            var ch2 = url.charCodeAt(start + 2);
-            if (ch2 === 97 || ch2 === 65)
-                return start + 3;
-        }
-        return -1;
-    }
-    function getEncodedRootLength(path) {
-        if (!path)
-            return 0;
-        var ch0 = path.charCodeAt(0);
-        if (ch0 === 47 || ch0 === 92) {
-            if (path.charCodeAt(1) !== ch0)
-                return 1;
-            var p1 = path.indexOf(ch0 === 47 ? ts.directorySeparator : altDirectorySeparator, 2);
-            if (p1 < 0)
-                return path.length;
-            return p1 + 1;
-        }
-        if (isVolumeCharacter(ch0) && path.charCodeAt(1) === 58) {
-            var ch2 = path.charCodeAt(2);
-            if (ch2 === 47 || ch2 === 92)
-                return 3;
-            if (path.length === 2)
-                return 2;
-        }
-        var schemeEnd = path.indexOf(urlSchemeSeparator);
-        if (schemeEnd !== -1) {
-            var authorityStart = schemeEnd + urlSchemeSeparator.length;
-            var authorityEnd = path.indexOf(ts.directorySeparator, authorityStart);
-            if (authorityEnd !== -1) {
-                var scheme = path.slice(0, schemeEnd);
-                var authority = path.slice(authorityStart, authorityEnd);
-                if (scheme === "file" && (authority === "" || authority === "localhost") &&
-                    isVolumeCharacter(path.charCodeAt(authorityEnd + 1))) {
-                    var volumeSeparatorEnd = getFileUrlVolumeSeparatorEnd(path, authorityEnd + 2);
-                    if (volumeSeparatorEnd !== -1) {
-                        if (path.charCodeAt(volumeSeparatorEnd) === 47) {
-                            return ~(volumeSeparatorEnd + 1);
-                        }
-                        if (volumeSeparatorEnd === path.length) {
-                            return ~volumeSeparatorEnd;
-                        }
-                    }
-                }
-                return ~(authorityEnd + 1);
-            }
-            return ~path.length;
-        }
-        return 0;
-    }
-    function getRootLength(path) {
-        var rootLength = getEncodedRootLength(path);
-        return rootLength < 0 ? ~rootLength : rootLength;
-    }
-    ts.getRootLength = getRootLength;
-    function normalizePath(path) {
-        return resolvePath(path);
-    }
-    ts.normalizePath = normalizePath;
-    function normalizePathAndParts(path) {
-        path = normalizeSlashes(path);
-        var _a = reducePathComponents(getPathComponents(path)), root = _a[0], parts = _a.slice(1);
-        if (parts.length) {
-            var joinedParts = root + parts.join(ts.directorySeparator);
-            return { path: hasTrailingDirectorySeparator(path) ? ensureTrailingDirectorySeparator(joinedParts) : joinedParts, parts: parts };
-        }
-        else {
-            return { path: root, parts: parts };
-        }
-    }
-    ts.normalizePathAndParts = normalizePathAndParts;
-    function getDirectoryPath(path) {
-        path = normalizeSlashes(path);
-        var rootLength = getRootLength(path);
-        if (rootLength === path.length)
-            return path;
-        path = removeTrailingDirectorySeparator(path);
-        return path.slice(0, Math.max(rootLength, path.lastIndexOf(ts.directorySeparator)));
-    }
-    ts.getDirectoryPath = getDirectoryPath;
-    function isUrl(path) {
-        return getEncodedRootLength(path) < 0;
-    }
-    ts.isUrl = isUrl;
-    function pathIsRelative(path) {
-        return /^\.\.?($|[\\/])/.test(path);
-    }
-    ts.pathIsRelative = pathIsRelative;
-    function isRootedDiskPath(path) {
-        return getEncodedRootLength(path) > 0;
-    }
-    ts.isRootedDiskPath = isRootedDiskPath;
-    function isDiskPathRoot(path) {
-        var rootLength = getEncodedRootLength(path);
-        return rootLength > 0 && rootLength === path.length;
-    }
-    ts.isDiskPathRoot = isDiskPathRoot;
-    function convertToRelativePath(absoluteOrRelativePath, basePath, getCanonicalFileName) {
-        return !isRootedDiskPath(absoluteOrRelativePath)
-            ? absoluteOrRelativePath
-            : getRelativePathToDirectoryOrUrl(basePath, absoluteOrRelativePath, basePath, getCanonicalFileName, false);
-    }
-    ts.convertToRelativePath = convertToRelativePath;
-    function pathComponents(path, rootLength) {
-        var root = path.substring(0, rootLength);
-        var rest = path.substring(rootLength).split(ts.directorySeparator);
-        if (rest.length && !lastOrUndefined(rest))
-            rest.pop();
-        return [root].concat(rest);
-    }
-    function getPathComponents(path, currentDirectory) {
-        if (currentDirectory === void 0) { currentDirectory = ""; }
-        path = combinePaths(currentDirectory, path);
-        var rootLength = getRootLength(path);
-        return pathComponents(path, rootLength);
-    }
-    ts.getPathComponents = getPathComponents;
-    function reducePathComponents(components) {
-        if (!some(components))
-            return [];
-        var reduced = [components[0]];
-        for (var i = 1; i < components.length; i++) {
-            var component = components[i];
-            if (!component)
-                continue;
-            if (component === ".")
-                continue;
-            if (component === "..") {
-                if (reduced.length > 1) {
-                    if (reduced[reduced.length - 1] !== "..") {
-                        reduced.pop();
-                        continue;
-                    }
-                }
-                else if (reduced[0])
-                    continue;
-            }
-            reduced.push(component);
-        }
-        return reduced;
-    }
-    ts.reducePathComponents = reducePathComponents;
-    function getNormalizedPathComponents(path, currentDirectory) {
-        return reducePathComponents(getPathComponents(path, currentDirectory));
-    }
-    ts.getNormalizedPathComponents = getNormalizedPathComponents;
-    function getNormalizedAbsolutePath(fileName, currentDirectory) {
-        return getPathFromPathComponents(getNormalizedPathComponents(fileName, currentDirectory));
-    }
-    ts.getNormalizedAbsolutePath = getNormalizedAbsolutePath;
-    function getPathFromPathComponents(pathComponents) {
-        if (pathComponents.length === 0)
-            return "";
-        var root = pathComponents[0] && ensureTrailingDirectorySeparator(pathComponents[0]);
-        if (pathComponents.length === 1)
-            return root;
-        return root + pathComponents.slice(1).join(ts.directorySeparator);
-    }
-    ts.getPathFromPathComponents = getPathFromPathComponents;
-    function getPathComponentsRelativeTo(from, to, stringEqualityComparer, getCanonicalFileName) {
-        var fromComponents = reducePathComponents(getPathComponents(from));
-        var toComponents = reducePathComponents(getPathComponents(to));
-        var start;
-        for (start = 0; start < fromComponents.length && start < toComponents.length; start++) {
-            var fromComponent = getCanonicalFileName(fromComponents[start]);
-            var toComponent = getCanonicalFileName(toComponents[start]);
-            var comparer = start === 0 ? equateStringsCaseInsensitive : stringEqualityComparer;
-            if (!comparer(fromComponent, toComponent))
-                break;
-        }
-        if (start === 0) {
-            return toComponents;
-        }
-        var components = toComponents.slice(start);
-        var relative = [];
-        for (; start < fromComponents.length; start++) {
-            relative.push("..");
-        }
-        return [""].concat(relative, components);
-    }
-    function getRelativePathFromFile(from, to, getCanonicalFileName) {
-        return ensurePathIsNonModuleName(getRelativePathFromDirectory(getDirectoryPath(from), to, getCanonicalFileName));
-    }
-    ts.getRelativePathFromFile = getRelativePathFromFile;
-    function getRelativePathFromDirectory(fromDirectory, to, getCanonicalFileNameOrIgnoreCase) {
-        Debug.assert((getRootLength(fromDirectory) > 0) === (getRootLength(to) > 0), "Paths must either both be absolute or both be relative");
-        var getCanonicalFileName = typeof getCanonicalFileNameOrIgnoreCase === "function" ? getCanonicalFileNameOrIgnoreCase : identity;
-        var ignoreCase = typeof getCanonicalFileNameOrIgnoreCase === "boolean" ? getCanonicalFileNameOrIgnoreCase : false;
-        var pathComponents = getPathComponentsRelativeTo(fromDirectory, to, ignoreCase ? equateStringsCaseInsensitive : equateStringsCaseSensitive, getCanonicalFileName);
-        return getPathFromPathComponents(pathComponents);
-    }
-    ts.getRelativePathFromDirectory = getRelativePathFromDirectory;
-    function getRelativePathToDirectoryOrUrl(directoryPathOrUrl, relativeOrAbsolutePath, currentDirectory, getCanonicalFileName, isAbsolutePathAnUrl) {
-        var pathComponents = getPathComponentsRelativeTo(resolvePath(currentDirectory, directoryPathOrUrl), resolvePath(currentDirectory, relativeOrAbsolutePath), equateStringsCaseSensitive, getCanonicalFileName);
-        var firstComponent = pathComponents[0];
-        if (isAbsolutePathAnUrl && isRootedDiskPath(firstComponent)) {
-            var prefix = firstComponent.charAt(0) === ts.directorySeparator ? "file://" : "file:///";
-            pathComponents[0] = prefix + firstComponent;
-        }
-        return getPathFromPathComponents(pathComponents);
-    }
-    ts.getRelativePathToDirectoryOrUrl = getRelativePathToDirectoryOrUrl;
-    function ensurePathIsNonModuleName(path) {
-        return getRootLength(path) === 0 && !pathIsRelative(path) ? "./" + path : path;
-    }
-    ts.ensurePathIsNonModuleName = ensurePathIsNonModuleName;
-    function getBaseFileName(path, extensions, ignoreCase) {
-        path = normalizeSlashes(path);
-        var rootLength = getRootLength(path);
-        if (rootLength === path.length)
-            return "";
-        path = removeTrailingDirectorySeparator(path);
-        var name = path.slice(Math.max(getRootLength(path), path.lastIndexOf(ts.directorySeparator) + 1));
-        var extension = extensions !== undefined && ignoreCase !== undefined ? getAnyExtensionFromPath(name, extensions, ignoreCase) : undefined;
-        return extension ? name.slice(0, name.length - extension.length) : name;
-    }
-    ts.getBaseFileName = getBaseFileName;
-    function combinePaths(path) {
-        var paths = [];
-        for (var _i = 1; _i < arguments.length; _i++) {
-            paths[_i - 1] = arguments[_i];
-        }
-        if (path)
-            path = normalizeSlashes(path);
-        for (var _a = 0, paths_1 = paths; _a < paths_1.length; _a++) {
-            var relativePath = paths_1[_a];
-            if (!relativePath)
-                continue;
-            relativePath = normalizeSlashes(relativePath);
-            if (!path || getRootLength(relativePath) !== 0) {
-                path = relativePath;
-            }
-            else {
-                path = ensureTrailingDirectorySeparator(path) + relativePath;
-            }
-        }
-        return path;
-    }
-    ts.combinePaths = combinePaths;
-    function resolvePath(path) {
-        var paths = [];
-        for (var _i = 1; _i < arguments.length; _i++) {
-            paths[_i - 1] = arguments[_i];
-        }
-        var combined = some(paths) ? combinePaths.apply(void 0, [path].concat(paths)) : normalizeSlashes(path);
-        var normalized = getPathFromPathComponents(reducePathComponents(getPathComponents(combined)));
-        return normalized && hasTrailingDirectorySeparator(combined) ? ensureTrailingDirectorySeparator(normalized) : normalized;
-    }
-    ts.resolvePath = resolvePath;
-    function hasTrailingDirectorySeparator(path) {
-        if (path.length === 0)
-            return false;
-        var ch = path.charCodeAt(path.length - 1);
-        return ch === 47 || ch === 92;
-    }
-    ts.hasTrailingDirectorySeparator = hasTrailingDirectorySeparator;
-    function removeTrailingDirectorySeparator(path) {
-        if (hasTrailingDirectorySeparator(path)) {
-            return path.substr(0, path.length - 1);
-        }
-        return path;
-    }
-    ts.removeTrailingDirectorySeparator = removeTrailingDirectorySeparator;
-    function ensureTrailingDirectorySeparator(path) {
-        if (!hasTrailingDirectorySeparator(path)) {
-            return path + ts.directorySeparator;
-        }
-        return path;
-    }
-    ts.ensureTrailingDirectorySeparator = ensureTrailingDirectorySeparator;
-    function comparePathsWorker(a, b, componentComparer) {
-        if (a === b)
-            return 0;
-        if (a === undefined)
-            return -1;
-        if (b === undefined)
-            return 1;
-        var aComponents = reducePathComponents(getPathComponents(a));
-        var bComponents = reducePathComponents(getPathComponents(b));
-        var sharedLength = Math.min(aComponents.length, bComponents.length);
-        for (var i = 0; i < sharedLength; i++) {
-            var stringComparer = i === 0 ? compareStringsCaseInsensitive : componentComparer;
-            var result = stringComparer(aComponents[i], bComponents[i]);
-            if (result !== 0) {
-                return result;
-            }
-        }
-        return compareValues(aComponents.length, bComponents.length);
-    }
-    function comparePathsCaseSensitive(a, b) {
-        return comparePathsWorker(a, b, compareStringsCaseSensitive);
-    }
-    ts.comparePathsCaseSensitive = comparePathsCaseSensitive;
-    function comparePathsCaseInsensitive(a, b) {
-        return comparePathsWorker(a, b, compareStringsCaseInsensitive);
-    }
-    ts.comparePathsCaseInsensitive = comparePathsCaseInsensitive;
-    function comparePaths(a, b, currentDirectory, ignoreCase) {
-        if (typeof currentDirectory === "string") {
-            a = combinePaths(currentDirectory, a);
-            b = combinePaths(currentDirectory, b);
-        }
-        else if (typeof currentDirectory === "boolean") {
-            ignoreCase = currentDirectory;
-        }
-        return comparePathsWorker(a, b, getStringComparer(ignoreCase));
-    }
-    ts.comparePaths = comparePaths;
-    function containsPath(parent, child, currentDirectory, ignoreCase) {
-        if (typeof currentDirectory === "string") {
-            parent = combinePaths(currentDirectory, parent);
-            child = combinePaths(currentDirectory, child);
-        }
-        else if (typeof currentDirectory === "boolean") {
-            ignoreCase = currentDirectory;
-        }
-        if (parent === undefined || child === undefined)
-            return false;
-        if (parent === child)
-            return true;
-        var parentComponents = reducePathComponents(getPathComponents(parent));
-        var childComponents = reducePathComponents(getPathComponents(child));
-        if (childComponents.length < parentComponents.length) {
-            return false;
-        }
-        var componentEqualityComparer = ignoreCase ? equateStringsCaseInsensitive : equateStringsCaseSensitive;
-        for (var i = 0; i < parentComponents.length; i++) {
-            var equalityComparer = i === 0 ? equateStringsCaseInsensitive : componentEqualityComparer;
-            if (!equalityComparer(parentComponents[i], childComponents[i])) {
-                return false;
-            }
-        }
-        return true;
-    }
-    ts.containsPath = containsPath;
-    function startsWith(str, prefix) {
-        return str.lastIndexOf(prefix, 0) === 0;
-    }
-    ts.startsWith = startsWith;
-    function removePrefix(str, prefix) {
-        return startsWith(str, prefix) ? str.substr(prefix.length) : str;
-    }
-    ts.removePrefix = removePrefix;
-    function tryRemovePrefix(str, prefix) {
-        return startsWith(str, prefix) ? str.substring(prefix.length) : undefined;
-    }
-    ts.tryRemovePrefix = tryRemovePrefix;
-    function tryRemoveDirectoryPrefix(path, dirPath) {
-        var a = tryRemovePrefix(path, dirPath);
-        if (a === undefined)
-            return undefined;
-        switch (a.charCodeAt(0)) {
-            case 47:
-            case 92:
-                return a.slice(1);
-            default:
-                return undefined;
-        }
-    }
-    ts.tryRemoveDirectoryPrefix = tryRemoveDirectoryPrefix;
-    function endsWith(str, suffix) {
-        var expectedPos = str.length - suffix.length;
-        return expectedPos >= 0 && str.indexOf(suffix, expectedPos) === expectedPos;
-    }
-    ts.endsWith = endsWith;
-    function removeSuffix(str, suffix) {
-        return endsWith(str, suffix) ? str.slice(0, str.length - suffix.length) : str;
-    }
-    ts.removeSuffix = removeSuffix;
-    function tryRemoveSuffix(str, suffix) {
-        return endsWith(str, suffix) ? str.slice(0, str.length - suffix.length) : undefined;
-    }
-    ts.tryRemoveSuffix = tryRemoveSuffix;
-    function stringContains(str, substring) {
-        return str.indexOf(substring) !== -1;
-    }
-    ts.stringContains = stringContains;
-    function hasExtension(fileName) {
-        return stringContains(getBaseFileName(fileName), ".");
-    }
-    ts.hasExtension = hasExtension;
-    function fileExtensionIs(path, extension) {
-        return path.length > extension.length && endsWith(path, extension);
-    }
-    ts.fileExtensionIs = fileExtensionIs;
-    function fileExtensionIsOneOf(path, extensions) {
-        for (var _i = 0, extensions_1 = extensions; _i < extensions_1.length; _i++) {
-            var extension = extensions_1[_i];
-            if (fileExtensionIs(path, extension)) {
-                return true;
-            }
-        }
-        return false;
-    }
-    ts.fileExtensionIsOneOf = fileExtensionIsOneOf;
-    var reservedCharacterPattern = /[^\w\s\/]/g;
-    var wildcardCharCodes = [42, 63];
-    ts.commonPackageFolders = ["node_modules", "bower_components", "jspm_packages"];
-    var implicitExcludePathRegexPattern = "(?!(" + ts.commonPackageFolders.join("|") + ")(/|$))";
-    var filesMatcher = {
-        singleAsteriskRegexFragment: "([^./]|(\\.(?!min\\.js$))?)*",
-        doubleAsteriskRegexFragment: "(/" + implicitExcludePathRegexPattern + "[^/.][^/]*)*?",
-        replaceWildcardCharacter: function (match) { return replaceWildcardCharacter(match, filesMatcher.singleAsteriskRegexFragment); }
-    };
-    var directoriesMatcher = {
-        singleAsteriskRegexFragment: "[^/]*",
-        doubleAsteriskRegexFragment: "(/" + implicitExcludePathRegexPattern + "[^/.][^/]*)*?",
-        replaceWildcardCharacter: function (match) { return replaceWildcardCharacter(match, directoriesMatcher.singleAsteriskRegexFragment); }
-    };
-    var excludeMatcher = {
-        singleAsteriskRegexFragment: "[^/]*",
-        doubleAsteriskRegexFragment: "(/.+?)?",
-        replaceWildcardCharacter: function (match) { return replaceWildcardCharacter(match, excludeMatcher.singleAsteriskRegexFragment); }
-    };
-    var wildcardMatchers = {
-        files: filesMatcher,
-        directories: directoriesMatcher,
-        exclude: excludeMatcher
-    };
-    function getRegularExpressionForWildcard(specs, basePath, usage) {
-        var patterns = getRegularExpressionsForWildcards(specs, basePath, usage);
-        if (!patterns || !patterns.length) {
-            return undefined;
-        }
-        var pattern = patterns.map(function (pattern) { return "(" + pattern + ")"; }).join("|");
-        var terminator = usage === "exclude" ? "($|/)" : "$";
-        return "^(" + pattern + ")" + terminator;
-    }
-    ts.getRegularExpressionForWildcard = getRegularExpressionForWildcard;
-    function getRegularExpressionsForWildcards(specs, basePath, usage) {
-        if (specs === undefined || specs.length === 0) {
-            return undefined;
-        }
-        return flatMap(specs, function (spec) {
-            return spec && getSubPatternFromSpec(spec, basePath, usage, wildcardMatchers[usage]);
-        });
-    }
-    function isImplicitGlob(lastPathComponent) {
-        return !/[.*?]/.test(lastPathComponent);
-    }
-    ts.isImplicitGlob = isImplicitGlob;
-    function getSubPatternFromSpec(spec, basePath, usage, _a) {
-        var singleAsteriskRegexFragment = _a.singleAsteriskRegexFragment, doubleAsteriskRegexFragment = _a.doubleAsteriskRegexFragment, replaceWildcardCharacter = _a.replaceWildcardCharacter;
-        var subpattern = "";
-        var hasWrittenComponent = false;
-        var components = getNormalizedPathComponents(spec, basePath);
-        var lastComponent = last(components);
-        if (usage !== "exclude" && lastComponent === "**") {
-            return undefined;
-        }
-        components[0] = removeTrailingDirectorySeparator(components[0]);
-        if (isImplicitGlob(lastComponent)) {
-            components.push("**", "*");
-        }
-        var optionalCount = 0;
-        for (var _i = 0, components_1 = components; _i < components_1.length; _i++) {
-            var component = components_1[_i];
-            if (component === "**") {
-                subpattern += doubleAsteriskRegexFragment;
-            }
-            else {
-                if (usage === "directories") {
-                    subpattern += "(";
-                    optionalCount++;
-                }
-                if (hasWrittenComponent) {
-                    subpattern += ts.directorySeparator;
-                }
-                if (usage !== "exclude") {
-                    var componentPattern = "";
-                    if (component.charCodeAt(0) === 42) {
-                        componentPattern += "([^./]" + singleAsteriskRegexFragment + ")?";
-                        component = component.substr(1);
-                    }
-                    else if (component.charCodeAt(0) === 63) {
-                        componentPattern += "[^./]";
-                        component = component.substr(1);
-                    }
-                    componentPattern += component.replace(reservedCharacterPattern, replaceWildcardCharacter);
-                    if (componentPattern !== component) {
-                        subpattern += implicitExcludePathRegexPattern;
-                    }
-                    subpattern += componentPattern;
-                }
-                else {
-                    subpattern += component.replace(reservedCharacterPattern, replaceWildcardCharacter);
-                }
-            }
-            hasWrittenComponent = true;
-        }
-        while (optionalCount > 0) {
-            subpattern += ")?";
-            optionalCount--;
-        }
-        return subpattern;
-    }
-    function replaceWildcardCharacter(match, singleAsteriskRegexFragment) {
-        return match === "*" ? singleAsteriskRegexFragment : match === "?" ? "[^/]" : "\\" + match;
-    }
-    function getFileMatcherPatterns(path, excludes, includes, useCaseSensitiveFileNames, currentDirectory) {
-        path = normalizePath(path);
-        currentDirectory = normalizePath(currentDirectory);
-        var absolutePath = combinePaths(currentDirectory, path);
-        return {
-            includeFilePatterns: map(getRegularExpressionsForWildcards(includes, absolutePath, "files"), function (pattern) { return "^" + pattern + "$"; }),
-            includeFilePattern: getRegularExpressionForWildcard(includes, absolutePath, "files"),
-            includeDirectoryPattern: getRegularExpressionForWildcard(includes, absolutePath, "directories"),
-            excludePattern: getRegularExpressionForWildcard(excludes, absolutePath, "exclude"),
-            basePaths: getBasePaths(path, includes, useCaseSensitiveFileNames)
-        };
-    }
-    ts.getFileMatcherPatterns = getFileMatcherPatterns;
-    function getRegexFromPattern(pattern, useCaseSensitiveFileNames) {
-        return new RegExp(pattern, useCaseSensitiveFileNames ? "" : "i");
-    }
-    ts.getRegexFromPattern = getRegexFromPattern;
-    function matchFiles(path, extensions, excludes, includes, useCaseSensitiveFileNames, currentDirectory, depth, getFileSystemEntries) {
-        path = normalizePath(path);
-        currentDirectory = normalizePath(currentDirectory);
-        var patterns = getFileMatcherPatterns(path, excludes, includes, useCaseSensitiveFileNames, currentDirectory);
-        var includeFileRegexes = patterns.includeFilePatterns && patterns.includeFilePatterns.map(function (pattern) { return getRegexFromPattern(pattern, useCaseSensitiveFileNames); });
-        var includeDirectoryRegex = patterns.includeDirectoryPattern && getRegexFromPattern(patterns.includeDirectoryPattern, useCaseSensitiveFileNames);
-        var excludeRegex = patterns.excludePattern && getRegexFromPattern(patterns.excludePattern, useCaseSensitiveFileNames);
-        var results = includeFileRegexes ? includeFileRegexes.map(function () { return []; }) : [[]];
-        for (var _i = 0, _a = patterns.basePaths; _i < _a.length; _i++) {
-            var basePath = _a[_i];
-            visitDirectory(basePath, combinePaths(currentDirectory, basePath), depth);
-        }
-        return flatten(results);
-        function visitDirectory(path, absolutePath, depth) {
-            var _a = getFileSystemEntries(path), files = _a.files, directories = _a.directories;
-            var _loop_1 = function (current) {
-                var name = combinePaths(path, current);
-                var absoluteName = combinePaths(absolutePath, current);
-                if (extensions && !fileExtensionIsOneOf(name, extensions))
-                    return "continue";
-                if (excludeRegex && excludeRegex.test(absoluteName))
-                    return "continue";
-                if (!includeFileRegexes) {
-                    results[0].push(name);
-                }
-                else {
-                    var includeIndex = findIndex(includeFileRegexes, function (re) { return re.test(absoluteName); });
-                    if (includeIndex !== -1) {
-                        results[includeIndex].push(name);
-                    }
-                }
-            };
-            for (var _i = 0, _b = sort(files, compareStringsCaseSensitive); _i < _b.length; _i++) {
-                var current = _b[_i];
-                _loop_1(current);
-            }
-            if (depth !== undefined) {
-                depth--;
-                if (depth === 0) {
-                    return;
-                }
-            }
-            for (var _c = 0, _d = sort(directories, compareStringsCaseSensitive); _c < _d.length; _c++) {
-                var current = _d[_c];
-                var name = combinePaths(path, current);
-                var absoluteName = combinePaths(absolutePath, current);
-                if ((!includeDirectoryRegex || includeDirectoryRegex.test(absoluteName)) &&
-                    (!excludeRegex || !excludeRegex.test(absoluteName))) {
-                    visitDirectory(name, absoluteName, depth);
-                }
-            }
-        }
-    }
-    ts.matchFiles = matchFiles;
-    function getBasePaths(path, includes, useCaseSensitiveFileNames) {
-        var basePaths = [path];
-        if (includes) {
-            var includeBasePaths = [];
-            for (var _i = 0, includes_1 = includes; _i < includes_1.length; _i++) {
-                var include = includes_1[_i];
-                var absolute = isRootedDiskPath(include) ? include : normalizePath(combinePaths(path, include));
-                includeBasePaths.push(getIncludeBasePath(absolute));
-            }
-            includeBasePaths.sort(getStringComparer(!useCaseSensitiveFileNames));
-            var _loop_2 = function (includeBasePath) {
-                if (every(basePaths, function (basePath) { return !containsPath(basePath, includeBasePath, path, !useCaseSensitiveFileNames); })) {
-                    basePaths.push(includeBasePath);
-                }
-            };
-            for (var _a = 0, includeBasePaths_1 = includeBasePaths; _a < includeBasePaths_1.length; _a++) {
-                var includeBasePath = includeBasePaths_1[_a];
-                _loop_2(includeBasePath);
-            }
-        }
-        return basePaths;
-    }
-    function getIncludeBasePath(absolute) {
-        var wildcardOffset = indexOfAnyCharCode(absolute, wildcardCharCodes);
-        if (wildcardOffset < 0) {
-            return !hasExtension(absolute)
-                ? absolute
-                : removeTrailingDirectorySeparator(getDirectoryPath(absolute));
-        }
-        return absolute.substring(0, absolute.lastIndexOf(ts.directorySeparator, wildcardOffset));
-    }
-    function ensureScriptKind(fileName, scriptKind) {
-        return scriptKind || getScriptKindFromFileName(fileName) || 3;
-    }
-    ts.ensureScriptKind = ensureScriptKind;
-    function getScriptKindFromFileName(fileName) {
-        var ext = fileName.substr(fileName.lastIndexOf("."));
-        switch (ext.toLowerCase()) {
-            case ".js":
-                return 1;
-            case ".jsx":
-                return 2;
-            case ".ts":
-                return 3;
-            case ".tsx":
-                return 4;
-            case ".json":
-                return 6;
-            default:
-                return 0;
-        }
-    }
-    ts.getScriptKindFromFileName = getScriptKindFromFileName;
-    ts.supportedTypeScriptExtensions = [".ts", ".tsx", ".d.ts"];
-    ts.supportedTypescriptExtensionsForExtractExtension = [".d.ts", ".ts", ".tsx"];
-    ts.supportedJavascriptExtensions = [".js", ".jsx"];
-    var allSupportedExtensions = ts.supportedTypeScriptExtensions.concat(ts.supportedJavascriptExtensions);
-    function getSupportedExtensions(options, extraFileExtensions) {
-        var needJsExtensions = options && options.allowJs;
-        if (!extraFileExtensions || extraFileExtensions.length === 0) {
-            return needJsExtensions ? allSupportedExtensions : ts.supportedTypeScriptExtensions;
-        }
-        var extensions = (needJsExtensions ? allSupportedExtensions : ts.supportedTypeScriptExtensions).concat(mapDefined(extraFileExtensions, function (x) { return x.scriptKind === 7 || needJsExtensions && isJavaScriptLike(x.scriptKind) ? x.extension : undefined; }));
-        return deduplicate(extensions, equateStringsCaseSensitive, compareStringsCaseSensitive);
-    }
-    ts.getSupportedExtensions = getSupportedExtensions;
-    function isJavaScriptLike(scriptKind) {
-        return scriptKind === 1 || scriptKind === 2;
-    }
-    function hasJavaScriptFileExtension(fileName) {
-        return some(ts.supportedJavascriptExtensions, function (extension) { return fileExtensionIs(fileName, extension); });
-    }
-    ts.hasJavaScriptFileExtension = hasJavaScriptFileExtension;
-    function hasTypeScriptFileExtension(fileName) {
-        return some(ts.supportedTypeScriptExtensions, function (extension) { return fileExtensionIs(fileName, extension); });
-    }
-    ts.hasTypeScriptFileExtension = hasTypeScriptFileExtension;
-    function isSupportedSourceFileName(fileName, compilerOptions, extraFileExtensions) {
-        if (!fileName) {
-            return false;
-        }
-        for (var _i = 0, _a = getSupportedExtensions(compilerOptions, extraFileExtensions); _i < _a.length; _i++) {
-            var extension = _a[_i];
-            if (fileExtensionIs(fileName, extension)) {
-                return true;
-            }
-        }
-        return false;
-    }
-    ts.isSupportedSourceFileName = isSupportedSourceFileName;
-    function getExtensionPriority(path, supportedExtensions) {
-        for (var i = supportedExtensions.length - 1; i >= 0; i--) {
-            if (fileExtensionIs(path, supportedExtensions[i])) {
-                return adjustExtensionPriority(i, supportedExtensions);
-            }
-        }
-        return 0;
-    }
-    ts.getExtensionPriority = getExtensionPriority;
-    function adjustExtensionPriority(extensionPriority, supportedExtensions) {
-        if (extensionPriority < 2) {
-            return 0;
-        }
-        else if (extensionPriority < supportedExtensions.length) {
-            return 2;
-        }
-        else {
-            return supportedExtensions.length;
-        }
-    }
-    ts.adjustExtensionPriority = adjustExtensionPriority;
-    function getNextLowestExtensionPriority(extensionPriority, supportedExtensions) {
-        if (extensionPriority < 2) {
-            return 2;
-        }
-        else {
-            return supportedExtensions.length;
-        }
-    }
-    ts.getNextLowestExtensionPriority = getNextLowestExtensionPriority;
-    var extensionsToRemove = [".d.ts", ".ts", ".js", ".tsx", ".jsx", ".json"];
-    function removeFileExtension(path) {
-        for (var _i = 0, extensionsToRemove_1 = extensionsToRemove; _i < extensionsToRemove_1.length; _i++) {
-            var ext = extensionsToRemove_1[_i];
-            var extensionless = tryRemoveExtension(path, ext);
-            if (extensionless !== undefined) {
-                return extensionless;
-            }
-        }
-        return path;
-    }
-    ts.removeFileExtension = removeFileExtension;
-    function tryRemoveExtension(path, extension) {
-        return fileExtensionIs(path, extension) ? removeExtension(path, extension) : undefined;
-    }
-    ts.tryRemoveExtension = tryRemoveExtension;
-    function removeExtension(path, extension) {
-        return path.substring(0, path.length - extension.length);
-    }
-    ts.removeExtension = removeExtension;
-    function changeExtension(path, newExtension) {
-        return changeAnyExtension(path, newExtension, extensionsToRemove, false);
-    }
-    ts.changeExtension = changeExtension;
-    function changeAnyExtension(path, ext, extensions, ignoreCase) {
-        var pathext = extensions !== undefined && ignoreCase !== undefined ? getAnyExtensionFromPath(path, extensions, ignoreCase) : getAnyExtensionFromPath(path);
-        return pathext ? path.slice(0, path.length - pathext.length) + (startsWith(ext, ".") ? ext : "." + ext) : path;
-    }
-    ts.changeAnyExtension = changeAnyExtension;
-    function removeMinAndVersionNumbers(fileName) {
-        var trailingMinOrVersion = /[.-]((min)|(\d+(\.\d+)*))$/;
-        return fileName.replace(trailingMinOrVersion, "").replace(trailingMinOrVersion, "");
-    }
-    ts.removeMinAndVersionNumbers = removeMinAndVersionNumbers;
-    function Symbol(flags, name) {
-        this.flags = flags;
-        this.escapedName = name;
-        this.declarations = undefined;
-        this.valueDeclaration = undefined;
-        this.id = undefined;
-        this.mergeId = undefined;
-        this.parent = undefined;
-    }
-    function Type(checker, flags) {
-        this.flags = flags;
-        if (Debug.isDebugging) {
-            this.checker = checker;
-        }
-    }
-    function Signature() { }
-    function Node(kind, pos, end) {
-        this.pos = pos;
-        this.end = end;
-        this.kind = kind;
-        this.id = 0;
-        this.flags = 0;
-        this.modifierFlagsCache = 0;
-        this.transformFlags = 0;
-        this.parent = undefined;
-        this.original = undefined;
-    }
-    function SourceMapSource(fileName, text, skipTrivia) {
-        this.fileName = fileName;
-        this.text = text;
-        this.skipTrivia = skipTrivia || (function (pos) { return pos; });
-    }
-    ts.objectAllocator = {
-        getNodeConstructor: function () { return Node; },
-        getTokenConstructor: function () { return Node; },
-        getIdentifierConstructor: function () { return Node; },
-        getSourceFileConstructor: function () { return Node; },
-        getSymbolConstructor: function () { return Symbol; },
-        getTypeConstructor: function () { return Type; },
-        getSignatureConstructor: function () { return Signature; },
-        getSourceMapSourceConstructor: function () { return SourceMapSource; },
-    };
+    var AssertionLevel;
+    (function (AssertionLevel) {
+        AssertionLevel[AssertionLevel["None"] = 0] = "None";
+        AssertionLevel[AssertionLevel["Normal"] = 1] = "Normal";
+        AssertionLevel[AssertionLevel["Aggressive"] = 2] = "Aggressive";
+        AssertionLevel[AssertionLevel["VeryAggressive"] = 3] = "VeryAggressive";
+    })(AssertionLevel = ts.AssertionLevel || (ts.AssertionLevel = {}));
     var Debug;
     (function (Debug) {
-        Debug.currentAssertionLevel = 0;
+        Debug.currentAssertionLevel = 0 /* None */;
         Debug.isDebugging = false;
         function shouldAssert(level) {
             return Debug.currentAssertionLevel >= level;
@@ -2636,27 +1501,350 @@ var ts;
             }
         }
         Debug.getFunctionName = getFunctionName;
-        function showSymbol(symbol) {
-            var symbolFlags = ts.SymbolFlags;
-            return "{ flags: " + (symbolFlags ? showFlags(symbol.flags, symbolFlags) : symbol.flags) + "; declarations: " + map(symbol.declarations, showSyntaxKind) + " }";
+    })(Debug = ts.Debug || (ts.Debug = {}));
+    function equateValues(a, b) {
+        return a === b;
+    }
+    ts.equateValues = equateValues;
+    /**
+     * Compare the equality of two strings using a case-sensitive ordinal comparison.
+     *
+     * Case-sensitive comparisons compare both strings one code-point at a time using the integer
+     * value of each code-point after applying `toUpperCase` to each string. We always map both
+     * strings to their upper-case form as some unicode characters do not properly round-trip to
+     * lowercase (such as `ẞ` (German sharp capital s)).
+     */
+    function equateStringsCaseInsensitive(a, b) {
+        return a === b
+            || a !== undefined
+                && b !== undefined
+                && a.toUpperCase() === b.toUpperCase();
+    }
+    ts.equateStringsCaseInsensitive = equateStringsCaseInsensitive;
+    /**
+     * Compare the equality of two strings using a case-sensitive ordinal comparison.
+     *
+     * Case-sensitive comparisons compare both strings one code-point at a time using the
+     * integer value of each code-point.
+     */
+    function equateStringsCaseSensitive(a, b) {
+        return equateValues(a, b);
+    }
+    ts.equateStringsCaseSensitive = equateStringsCaseSensitive;
+    function compareComparableValues(a, b) {
+        return a === b ? 0 /* EqualTo */ :
+            a === undefined ? -1 /* LessThan */ :
+                b === undefined ? 1 /* GreaterThan */ :
+                    a < b ? -1 /* LessThan */ :
+                        1 /* GreaterThan */;
+    }
+    /**
+     * Compare two numeric values for their order relative to each other.
+     * To compare strings, use any of the `compareStrings` functions.
+     */
+    function compareValues(a, b) {
+        return compareComparableValues(a, b);
+    }
+    ts.compareValues = compareValues;
+    function min(a, b, compare) {
+        return compare(a, b) === -1 /* LessThan */ ? a : b;
+    }
+    ts.min = min;
+    /**
+     * Compare two strings using a case-insensitive ordinal comparison.
+     *
+     * Ordinal comparisons are based on the difference between the unicode code points of both
+     * strings. Characters with multiple unicode representations are considered unequal. Ordinal
+     * comparisons provide predictable ordering, but place "a" after "B".
+     *
+     * Case-insensitive comparisons compare both strings one code-point at a time using the integer
+     * value of each code-point after applying `toUpperCase` to each string. We always map both
+     * strings to their upper-case form as some unicode characters do not properly round-trip to
+     * lowercase (such as `ẞ` (German sharp capital s)).
+     */
+    function compareStringsCaseInsensitive(a, b) {
+        if (a === b)
+            return 0 /* EqualTo */;
+        if (a === undefined)
+            return -1 /* LessThan */;
+        if (b === undefined)
+            return 1 /* GreaterThan */;
+        a = a.toUpperCase();
+        b = b.toUpperCase();
+        return a < b ? -1 /* LessThan */ : a > b ? 1 /* GreaterThan */ : 0 /* EqualTo */;
+    }
+    ts.compareStringsCaseInsensitive = compareStringsCaseInsensitive;
+    /**
+     * Compare two strings using a case-sensitive ordinal comparison.
+     *
+     * Ordinal comparisons are based on the difference between the unicode code points of both
+     * strings. Characters with multiple unicode representations are considered unequal. Ordinal
+     * comparisons provide predictable ordering, but place "a" after "B".
+     *
+     * Case-sensitive comparisons compare both strings one code-point at a time using the integer
+     * value of each code-point.
+     */
+    function compareStringsCaseSensitive(a, b) {
+        return compareComparableValues(a, b);
+    }
+    ts.compareStringsCaseSensitive = compareStringsCaseSensitive;
+    function getStringComparer(ignoreCase) {
+        return ignoreCase ? compareStringsCaseInsensitive : compareStringsCaseSensitive;
+    }
+    ts.getStringComparer = getStringComparer;
+    /**
+     * Creates a string comparer for use with string collation in the UI.
+     */
+    var createUIStringComparer = (function () {
+        var defaultComparer;
+        var enUSComparer;
+        var stringComparerFactory = getStringComparerFactory();
+        return createStringComparer;
+        function compareWithCallback(a, b, comparer) {
+            if (a === b)
+                return 0 /* EqualTo */;
+            if (a === undefined)
+                return -1 /* LessThan */;
+            if (b === undefined)
+                return 1 /* GreaterThan */;
+            var value = comparer(a, b);
+            return value < 0 ? -1 /* LessThan */ : value > 0 ? 1 /* GreaterThan */ : 0 /* EqualTo */;
         }
-        Debug.showSymbol = showSymbol;
-        function showFlags(flags, flagsEnum) {
-            var out = [];
-            for (var pow = 0; pow <= 30; pow++) {
-                var n = 1 << pow;
-                if (flags & n) {
-                    out.push(flagsEnum[n]);
+        function createIntlCollatorStringComparer(locale) {
+            // Intl.Collator.prototype.compare is bound to the collator. See NOTE in
+            // http://www.ecma-international.org/ecma-402/2.0/#sec-Intl.Collator.prototype.compare
+            var comparer = new Intl.Collator(locale, { usage: "sort", sensitivity: "variant" }).compare;
+            return function (a, b) { return compareWithCallback(a, b, comparer); };
+        }
+        function createLocaleCompareStringComparer(locale) {
+            // if the locale is not the default locale (`undefined`), use the fallback comparer.
+            if (locale !== undefined)
+                return createFallbackStringComparer();
+            return function (a, b) { return compareWithCallback(a, b, compareStrings); };
+            function compareStrings(a, b) {
+                return a.localeCompare(b);
+            }
+        }
+        function createFallbackStringComparer() {
+            // An ordinal comparison puts "A" after "b", but for the UI we want "A" before "b".
+            // We first sort case insensitively.  So "Aaa" will come before "baa".
+            // Then we sort case sensitively, so "aaa" will come before "Aaa".
+            //
+            // For case insensitive comparisons we always map both strings to their
+            // upper-case form as some unicode characters do not properly round-trip to
+            // lowercase (such as `ẞ` (German sharp capital s)).
+            return function (a, b) { return compareWithCallback(a, b, compareDictionaryOrder); };
+            function compareDictionaryOrder(a, b) {
+                return compareStrings(a.toUpperCase(), b.toUpperCase()) || compareStrings(a, b);
+            }
+            function compareStrings(a, b) {
+                return a < b ? -1 /* LessThan */ : a > b ? 1 /* GreaterThan */ : 0 /* EqualTo */;
+            }
+        }
+        function getStringComparerFactory() {
+            // If the host supports Intl, we use it for comparisons using the default locale.
+            if (typeof Intl === "object" && typeof Intl.Collator === "function") {
+                return createIntlCollatorStringComparer;
+            }
+            // If the host does not support Intl, we fall back to localeCompare.
+            // localeCompare in Node v0.10 is just an ordinal comparison, so don't use it.
+            if (typeof String.prototype.localeCompare === "function" &&
+                typeof String.prototype.toLocaleUpperCase === "function" &&
+                "a".localeCompare("B") < 0) {
+                return createLocaleCompareStringComparer;
+            }
+            // Otherwise, fall back to ordinal comparison:
+            return createFallbackStringComparer;
+        }
+        function createStringComparer(locale) {
+            // Hold onto common string comparers. This avoids constantly reallocating comparers during
+            // tests.
+            if (locale === undefined) {
+                return defaultComparer || (defaultComparer = stringComparerFactory(locale));
+            }
+            else if (locale === "en-US") {
+                return enUSComparer || (enUSComparer = stringComparerFactory(locale));
+            }
+            else {
+                return stringComparerFactory(locale);
+            }
+        }
+    })();
+    var uiComparerCaseSensitive;
+    var uiLocale;
+    function getUILocale() {
+        return uiLocale;
+    }
+    ts.getUILocale = getUILocale;
+    function setUILocale(value) {
+        if (uiLocale !== value) {
+            uiLocale = value;
+            uiComparerCaseSensitive = undefined;
+        }
+    }
+    ts.setUILocale = setUILocale;
+    /**
+     * Compare two strings in a using the case-sensitive sort behavior of the UI locale.
+     *
+     * Ordering is not predictable between different host locales, but is best for displaying
+     * ordered data for UI presentation. Characters with multiple unicode representations may
+     * be considered equal.
+     *
+     * Case-sensitive comparisons compare strings that differ in base characters, or
+     * accents/diacritic marks, or case as unequal.
+     */
+    function compareStringsCaseSensitiveUI(a, b) {
+        var comparer = uiComparerCaseSensitive || (uiComparerCaseSensitive = createUIStringComparer(uiLocale));
+        return comparer(a, b);
+    }
+    ts.compareStringsCaseSensitiveUI = compareStringsCaseSensitiveUI;
+    function compareProperties(a, b, key, comparer) {
+        return a === b ? 0 /* EqualTo */ :
+            a === undefined ? -1 /* LessThan */ :
+                b === undefined ? 1 /* GreaterThan */ :
+                    comparer(a[key], b[key]);
+    }
+    ts.compareProperties = compareProperties;
+    /** True is greater than false. */
+    function compareBooleans(a, b) {
+        return compareValues(a ? 1 : 0, b ? 1 : 0);
+    }
+    ts.compareBooleans = compareBooleans;
+    /**
+     * Given a name and a list of names that are *not* equal to the name, return a spelling suggestion if there is one that is close enough.
+     * Names less than length 3 only check for case-insensitive equality, not Levenshtein distance.
+     *
+     * If there is a candidate that's the same except for case, return that.
+     * If there is a candidate that's within one edit of the name, return that.
+     * Otherwise, return the candidate with the smallest Levenshtein distance,
+     *    except for candidates:
+     *      * With no name
+     *      * Whose length differs from the target name by more than 0.34 of the length of the name.
+     *      * Whose levenshtein distance is more than 0.4 of the length of the name
+     *        (0.4 allows 1 substitution/transposition for every 5 characters,
+     *         and 1 insertion/deletion at 3 characters)
+     */
+    function getSpellingSuggestion(name, candidates, getName) {
+        var maximumLengthDifference = Math.min(2, Math.floor(name.length * 0.34));
+        var bestDistance = Math.floor(name.length * 0.4) + 1; // If the best result isn't better than this, don't bother.
+        var bestCandidate;
+        var justCheckExactMatches = false;
+        var nameLowerCase = name.toLowerCase();
+        for (var _i = 0, candidates_1 = candidates; _i < candidates_1.length; _i++) {
+            var candidate = candidates_1[_i];
+            var candidateName = getName(candidate);
+            if (candidateName !== undefined && Math.abs(candidateName.length - nameLowerCase.length) <= maximumLengthDifference) {
+                var candidateNameLowerCase = candidateName.toLowerCase();
+                if (candidateNameLowerCase === nameLowerCase) {
+                    return candidate;
+                }
+                if (justCheckExactMatches) {
+                    continue;
+                }
+                if (candidateName.length < 3) {
+                    // Don't bother, user would have noticed a 2-character name having an extra character
+                    continue;
+                }
+                // Only care about a result better than the best so far.
+                var distance = levenshteinWithMax(nameLowerCase, candidateNameLowerCase, bestDistance - 1);
+                if (distance === undefined) {
+                    continue;
+                }
+                if (distance < 3) {
+                    justCheckExactMatches = true;
+                    bestCandidate = candidate;
+                }
+                else {
+                    Debug.assert(distance < bestDistance); // Else `levenshteinWithMax` should return undefined
+                    bestDistance = distance;
+                    bestCandidate = candidate;
                 }
             }
-            return out.join("|");
         }
-        function showSyntaxKind(node) {
-            var syntaxKind = ts.SyntaxKind;
-            return syntaxKind ? syntaxKind[node.kind] : node.kind.toString();
+        return bestCandidate;
+    }
+    ts.getSpellingSuggestion = getSpellingSuggestion;
+    function levenshteinWithMax(s1, s2, max) {
+        var previous = new Array(s2.length + 1);
+        var current = new Array(s2.length + 1);
+        /** Represents any value > max. We don't care about the particular value. */
+        var big = max + 1;
+        for (var i = 0; i <= s2.length; i++) {
+            previous[i] = i;
         }
-        Debug.showSyntaxKind = showSyntaxKind;
-    })(Debug = ts.Debug || (ts.Debug = {}));
+        for (var i = 1; i <= s1.length; i++) {
+            var c1 = s1.charCodeAt(i - 1);
+            var minJ = i > max ? i - max : 1;
+            var maxJ = s2.length > max + i ? max + i : s2.length;
+            current[0] = i;
+            /** Smallest value of the matrix in the ith column. */
+            var colMin = i;
+            for (var j = 1; j < minJ; j++) {
+                current[j] = big;
+            }
+            for (var j = minJ; j <= maxJ; j++) {
+                var dist = c1 === s2.charCodeAt(j - 1)
+                    ? previous[j - 1]
+                    : Math.min(/*delete*/ previous[j] + 1, /*insert*/ current[j - 1] + 1, /*substitute*/ previous[j - 1] + 2);
+                current[j] = dist;
+                colMin = Math.min(colMin, dist);
+            }
+            for (var j = maxJ + 1; j <= s2.length; j++) {
+                current[j] = big;
+            }
+            if (colMin > max) {
+                // Give up -- everything in this column is > max and it can't get better in future columns.
+                return undefined;
+            }
+            var temp = previous;
+            previous = current;
+            current = temp;
+        }
+        var res = previous[s2.length];
+        return res > max ? undefined : res;
+    }
+    function endsWith(str, suffix) {
+        var expectedPos = str.length - suffix.length;
+        return expectedPos >= 0 && str.indexOf(suffix, expectedPos) === expectedPos;
+    }
+    ts.endsWith = endsWith;
+    function removeSuffix(str, suffix) {
+        return endsWith(str, suffix) ? str.slice(0, str.length - suffix.length) : str;
+    }
+    ts.removeSuffix = removeSuffix;
+    function tryRemoveSuffix(str, suffix) {
+        return endsWith(str, suffix) ? str.slice(0, str.length - suffix.length) : undefined;
+    }
+    ts.tryRemoveSuffix = tryRemoveSuffix;
+    function stringContains(str, substring) {
+        return str.indexOf(substring) !== -1;
+    }
+    ts.stringContains = stringContains;
+    function fileExtensionIs(path, extension) {
+        return path.length > extension.length && endsWith(path, extension);
+    }
+    ts.fileExtensionIs = fileExtensionIs;
+    function fileExtensionIsOneOf(path, extensions) {
+        for (var _i = 0, extensions_1 = extensions; _i < extensions_1.length; _i++) {
+            var extension = extensions_1[_i];
+            if (fileExtensionIs(path, extension)) {
+                return true;
+            }
+        }
+        return false;
+    }
+    ts.fileExtensionIsOneOf = fileExtensionIsOneOf;
+    /**
+     * Takes a string like "jquery-min.4.2.3" and returns "jquery"
+     */
+    function removeMinAndVersionNumbers(fileName) {
+        // Match a "." or "-" followed by a version number or 'min' at the end of the name
+        var trailingMinOrVersion = /[.-]((min)|(\d+(\.\d+)*))$/;
+        // The "min" or version may both be present, in either order, so try applying the above twice.
+        return fileName.replace(trailingMinOrVersion, "").replace(trailingMinOrVersion, "");
+    }
+    ts.removeMinAndVersionNumbers = removeMinAndVersionNumbers;
+    /** Remove an item from an array, moving everything to its right one space left. */
     function orderedRemoveItem(array, item) {
         for (var i = 0; i < array.length; i++) {
             if (array[i] === item) {
@@ -2667,7 +1855,9 @@ var ts;
         return false;
     }
     ts.orderedRemoveItem = orderedRemoveItem;
+    /** Remove an item by index from an array, moving everything to its right one space left. */
     function orderedRemoveItemAt(array, index) {
+        // This seems to be faster than either `array.splice(i, 1)` or `array.copyWithin(i, i+ 1)`.
         for (var i = index; i < array.length - 1; i++) {
             array[i] = array[i + 1];
         }
@@ -2675,14 +1865,17 @@ var ts;
     }
     ts.orderedRemoveItemAt = orderedRemoveItemAt;
     function unorderedRemoveItemAt(array, index) {
+        // Fill in the "hole" left at `index`.
         array[index] = array[array.length - 1];
         array.pop();
     }
     ts.unorderedRemoveItemAt = unorderedRemoveItemAt;
+    /** Remove the *first* occurrence of `item` from the array. */
     function unorderedRemoveItem(array, item) {
         return unorderedRemoveFirstItemWhere(array, function (element) { return element === item; });
     }
     ts.unorderedRemoveItem = unorderedRemoveItem;
+    /** Remove the *first* element satisfying `predicate`. */
     function unorderedRemoveFirstItemWhere(array, predicate) {
         for (var i = 0; i < array.length; i++) {
             if (predicate(array[i])) {
@@ -2696,33 +1889,24 @@ var ts;
         return useCaseSensitiveFileNames ? identity : toLowerCase;
     }
     ts.createGetCanonicalFileName = createGetCanonicalFileName;
-    function matchPatternOrExact(patternStrings, candidate) {
-        var patterns = [];
-        for (var _i = 0, patternStrings_1 = patternStrings; _i < patternStrings_1.length; _i++) {
-            var patternString = patternStrings_1[_i];
-            var pattern = tryParsePattern(patternString);
-            if (pattern) {
-                patterns.push(pattern);
-            }
-            else if (patternString === candidate) {
-                return patternString;
-            }
-        }
-        return findBestPatternMatch(patterns, function (_) { return _; }, candidate);
-    }
-    ts.matchPatternOrExact = matchPatternOrExact;
     function patternText(_a) {
         var prefix = _a.prefix, suffix = _a.suffix;
         return prefix + "*" + suffix;
     }
     ts.patternText = patternText;
+    /**
+     * Given that candidate matches pattern, returns the text matching the '*'.
+     * E.g.: matchedText(tryParsePattern("foo*baz"), "foobarbaz") === "bar"
+     */
     function matchedText(pattern, candidate) {
         Debug.assert(isPatternMatch(pattern, candidate));
         return candidate.substring(pattern.prefix.length, candidate.length - pattern.suffix.length);
     }
     ts.matchedText = matchedText;
+    /** Return the object corresponding to the best pattern to match `candidate`. */
     function findBestPatternMatch(values, getPattern, candidate) {
         var matchedValue;
+        // use length of prefix as betterness criteria
         var longestMatchPrefixLength = -1;
         for (var _i = 0, values_2 = values; _i < values_2.length; _i++) {
             var v = values_2[_i];
@@ -2735,78 +1919,24 @@ var ts;
         return matchedValue;
     }
     ts.findBestPatternMatch = findBestPatternMatch;
+    function startsWith(str, prefix) {
+        return str.lastIndexOf(prefix, 0) === 0;
+    }
+    ts.startsWith = startsWith;
+    function removePrefix(str, prefix) {
+        return startsWith(str, prefix) ? str.substr(prefix.length) : str;
+    }
+    ts.removePrefix = removePrefix;
+    function tryRemovePrefix(str, prefix) {
+        return startsWith(str, prefix) ? str.substring(prefix.length) : undefined;
+    }
+    ts.tryRemovePrefix = tryRemovePrefix;
     function isPatternMatch(_a, candidate) {
         var prefix = _a.prefix, suffix = _a.suffix;
         return candidate.length >= prefix.length + suffix.length &&
             startsWith(candidate, prefix) &&
             endsWith(candidate, suffix);
     }
-    function tryParsePattern(pattern) {
-        Debug.assert(hasZeroOrOneAsteriskCharacter(pattern));
-        var indexOfStar = pattern.indexOf("*");
-        return indexOfStar === -1 ? undefined : {
-            prefix: pattern.substr(0, indexOfStar),
-            suffix: pattern.substr(indexOfStar + 1)
-        };
-    }
-    ts.tryParsePattern = tryParsePattern;
-    function positionIsSynthesized(pos) {
-        return !(pos >= 0);
-    }
-    ts.positionIsSynthesized = positionIsSynthesized;
-    function extensionIsTypeScript(ext) {
-        return ext === ".ts" || ext === ".tsx" || ext === ".d.ts";
-    }
-    ts.extensionIsTypeScript = extensionIsTypeScript;
-    function resolutionExtensionIsTypeScriptOrJson(ext) {
-        return extensionIsTypeScript(ext) || ext === ".json";
-    }
-    ts.resolutionExtensionIsTypeScriptOrJson = resolutionExtensionIsTypeScriptOrJson;
-    function extensionFromPath(path) {
-        var ext = tryGetExtensionFromPath(path);
-        return ext !== undefined ? ext : Debug.fail("File " + path + " has unknown extension.");
-    }
-    ts.extensionFromPath = extensionFromPath;
-    function isAnySupportedFileExtension(path) {
-        return tryGetExtensionFromPath(path) !== undefined;
-    }
-    ts.isAnySupportedFileExtension = isAnySupportedFileExtension;
-    function tryGetExtensionFromPath(path) {
-        return find(ts.supportedTypescriptExtensionsForExtractExtension, function (e) { return fileExtensionIs(path, e); }) || find(ts.supportedJavascriptExtensions, function (e) { return fileExtensionIs(path, e); });
-    }
-    ts.tryGetExtensionFromPath = tryGetExtensionFromPath;
-    function getAnyExtensionFromPathWorker(path, extensions, stringEqualityComparer) {
-        if (typeof extensions === "string")
-            extensions = [extensions];
-        for (var _i = 0, extensions_2 = extensions; _i < extensions_2.length; _i++) {
-            var extension = extensions_2[_i];
-            if (!startsWith(extension, "."))
-                extension = "." + extension;
-            if (path.length >= extension.length && path.charAt(path.length - extension.length) === ".") {
-                var pathExtension = path.slice(path.length - extension.length);
-                if (stringEqualityComparer(pathExtension, extension)) {
-                    return pathExtension;
-                }
-            }
-        }
-        return "";
-    }
-    function getAnyExtensionFromPath(path, extensions, ignoreCase) {
-        if (extensions) {
-            return getAnyExtensionFromPathWorker(path, extensions, ignoreCase ? equateStringsCaseInsensitive : equateStringsCaseSensitive);
-        }
-        var baseFileName = getBaseFileName(path);
-        var extensionIndex = baseFileName.lastIndexOf(".");
-        if (extensionIndex >= 0) {
-            return baseFileName.substring(extensionIndex);
-        }
-        return "";
-    }
-    ts.getAnyExtensionFromPath = getAnyExtensionFromPath;
-    function isCheckJsEnabledForFile(sourceFile, compilerOptions) {
-        return sourceFile.checkJsDirective ? sourceFile.checkJsDirective.enabled : compilerOptions.checkJs;
-    }
-    ts.isCheckJsEnabledForFile = isCheckJsEnabledForFile;
     function and(f, g) {
         return function (arg) { return f(arg) && g(arg); };
     }
@@ -2815,12 +1945,8 @@ var ts;
         return function (arg) { return f(arg) || g(arg); };
     }
     ts.or = or;
-    function assertTypeIsNever(_) { }
+    function assertTypeIsNever(_) { } // tslint:disable-line no-empty
     ts.assertTypeIsNever = assertTypeIsNever;
-    ts.emptyFileSystemEntries = {
-        files: ts.emptyArray,
-        directories: ts.emptyArray
-    };
     function singleElementArray(t) {
         return t === undefined ? undefined : [t];
     }
@@ -2835,11 +1961,11 @@ var ts;
             var newItem = newItems[newIndex];
             var oldItem = oldItems[oldIndex];
             var compareResult = comparer(newItem, oldItem);
-            if (compareResult === -1) {
+            if (compareResult === -1 /* LessThan */) {
                 inserted(newItem);
                 newIndex++;
             }
-            else if (compareResult === 1) {
+            else if (compareResult === 1 /* GreaterThan */) {
                 deleted(oldItem);
                 oldIndex++;
             }
@@ -2858,10 +1984,1526 @@ var ts;
     }
     ts.enumerateInsertsAndDeletes = enumerateInsertsAndDeletes;
 })(ts || (ts = {}));
+//# sourceMappingURL=core.js.map
+"use strict";
+var __assign = (this && this.__assign) || Object.assign || function(t) {
+    for (var s, i = 1, n = arguments.length; i < n; i++) {
+        s = arguments[i];
+        for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
+            t[p] = s[p];
+    }
+    return t;
+};
 var ts;
 (function (ts) {
+    // token > SyntaxKind.Identifier => token is a keyword
+    // Also, If you add a new SyntaxKind be sure to keep the `Markers` section at the bottom in sync
+    var SyntaxKind;
+    (function (SyntaxKind) {
+        SyntaxKind[SyntaxKind["Unknown"] = 0] = "Unknown";
+        SyntaxKind[SyntaxKind["EndOfFileToken"] = 1] = "EndOfFileToken";
+        SyntaxKind[SyntaxKind["SingleLineCommentTrivia"] = 2] = "SingleLineCommentTrivia";
+        SyntaxKind[SyntaxKind["MultiLineCommentTrivia"] = 3] = "MultiLineCommentTrivia";
+        SyntaxKind[SyntaxKind["NewLineTrivia"] = 4] = "NewLineTrivia";
+        SyntaxKind[SyntaxKind["WhitespaceTrivia"] = 5] = "WhitespaceTrivia";
+        // We detect and preserve #! on the first line
+        SyntaxKind[SyntaxKind["ShebangTrivia"] = 6] = "ShebangTrivia";
+        // We detect and provide better error recovery when we encounter a git merge marker.  This
+        // allows us to edit files with git-conflict markers in them in a much more pleasant manner.
+        SyntaxKind[SyntaxKind["ConflictMarkerTrivia"] = 7] = "ConflictMarkerTrivia";
+        // Literals
+        SyntaxKind[SyntaxKind["NumericLiteral"] = 8] = "NumericLiteral";
+        SyntaxKind[SyntaxKind["StringLiteral"] = 9] = "StringLiteral";
+        SyntaxKind[SyntaxKind["JsxText"] = 10] = "JsxText";
+        SyntaxKind[SyntaxKind["JsxTextAllWhiteSpaces"] = 11] = "JsxTextAllWhiteSpaces";
+        SyntaxKind[SyntaxKind["RegularExpressionLiteral"] = 12] = "RegularExpressionLiteral";
+        SyntaxKind[SyntaxKind["NoSubstitutionTemplateLiteral"] = 13] = "NoSubstitutionTemplateLiteral";
+        // Pseudo-literals
+        SyntaxKind[SyntaxKind["TemplateHead"] = 14] = "TemplateHead";
+        SyntaxKind[SyntaxKind["TemplateMiddle"] = 15] = "TemplateMiddle";
+        SyntaxKind[SyntaxKind["TemplateTail"] = 16] = "TemplateTail";
+        // Punctuation
+        SyntaxKind[SyntaxKind["OpenBraceToken"] = 17] = "OpenBraceToken";
+        SyntaxKind[SyntaxKind["CloseBraceToken"] = 18] = "CloseBraceToken";
+        SyntaxKind[SyntaxKind["OpenParenToken"] = 19] = "OpenParenToken";
+        SyntaxKind[SyntaxKind["CloseParenToken"] = 20] = "CloseParenToken";
+        SyntaxKind[SyntaxKind["OpenBracketToken"] = 21] = "OpenBracketToken";
+        SyntaxKind[SyntaxKind["CloseBracketToken"] = 22] = "CloseBracketToken";
+        SyntaxKind[SyntaxKind["DotToken"] = 23] = "DotToken";
+        SyntaxKind[SyntaxKind["DotDotDotToken"] = 24] = "DotDotDotToken";
+        SyntaxKind[SyntaxKind["SemicolonToken"] = 25] = "SemicolonToken";
+        SyntaxKind[SyntaxKind["CommaToken"] = 26] = "CommaToken";
+        SyntaxKind[SyntaxKind["LessThanToken"] = 27] = "LessThanToken";
+        SyntaxKind[SyntaxKind["LessThanSlashToken"] = 28] = "LessThanSlashToken";
+        SyntaxKind[SyntaxKind["GreaterThanToken"] = 29] = "GreaterThanToken";
+        SyntaxKind[SyntaxKind["LessThanEqualsToken"] = 30] = "LessThanEqualsToken";
+        SyntaxKind[SyntaxKind["GreaterThanEqualsToken"] = 31] = "GreaterThanEqualsToken";
+        SyntaxKind[SyntaxKind["EqualsEqualsToken"] = 32] = "EqualsEqualsToken";
+        SyntaxKind[SyntaxKind["ExclamationEqualsToken"] = 33] = "ExclamationEqualsToken";
+        SyntaxKind[SyntaxKind["EqualsEqualsEqualsToken"] = 34] = "EqualsEqualsEqualsToken";
+        SyntaxKind[SyntaxKind["ExclamationEqualsEqualsToken"] = 35] = "ExclamationEqualsEqualsToken";
+        SyntaxKind[SyntaxKind["EqualsGreaterThanToken"] = 36] = "EqualsGreaterThanToken";
+        SyntaxKind[SyntaxKind["PlusToken"] = 37] = "PlusToken";
+        SyntaxKind[SyntaxKind["MinusToken"] = 38] = "MinusToken";
+        SyntaxKind[SyntaxKind["AsteriskToken"] = 39] = "AsteriskToken";
+        SyntaxKind[SyntaxKind["AsteriskAsteriskToken"] = 40] = "AsteriskAsteriskToken";
+        SyntaxKind[SyntaxKind["SlashToken"] = 41] = "SlashToken";
+        SyntaxKind[SyntaxKind["PercentToken"] = 42] = "PercentToken";
+        SyntaxKind[SyntaxKind["PlusPlusToken"] = 43] = "PlusPlusToken";
+        SyntaxKind[SyntaxKind["MinusMinusToken"] = 44] = "MinusMinusToken";
+        SyntaxKind[SyntaxKind["LessThanLessThanToken"] = 45] = "LessThanLessThanToken";
+        SyntaxKind[SyntaxKind["GreaterThanGreaterThanToken"] = 46] = "GreaterThanGreaterThanToken";
+        SyntaxKind[SyntaxKind["GreaterThanGreaterThanGreaterThanToken"] = 47] = "GreaterThanGreaterThanGreaterThanToken";
+        SyntaxKind[SyntaxKind["AmpersandToken"] = 48] = "AmpersandToken";
+        SyntaxKind[SyntaxKind["BarToken"] = 49] = "BarToken";
+        SyntaxKind[SyntaxKind["CaretToken"] = 50] = "CaretToken";
+        SyntaxKind[SyntaxKind["ExclamationToken"] = 51] = "ExclamationToken";
+        SyntaxKind[SyntaxKind["TildeToken"] = 52] = "TildeToken";
+        SyntaxKind[SyntaxKind["AmpersandAmpersandToken"] = 53] = "AmpersandAmpersandToken";
+        SyntaxKind[SyntaxKind["BarBarToken"] = 54] = "BarBarToken";
+        SyntaxKind[SyntaxKind["QuestionToken"] = 55] = "QuestionToken";
+        SyntaxKind[SyntaxKind["ColonToken"] = 56] = "ColonToken";
+        SyntaxKind[SyntaxKind["AtToken"] = 57] = "AtToken";
+        // Assignments
+        SyntaxKind[SyntaxKind["EqualsToken"] = 58] = "EqualsToken";
+        SyntaxKind[SyntaxKind["PlusEqualsToken"] = 59] = "PlusEqualsToken";
+        SyntaxKind[SyntaxKind["MinusEqualsToken"] = 60] = "MinusEqualsToken";
+        SyntaxKind[SyntaxKind["AsteriskEqualsToken"] = 61] = "AsteriskEqualsToken";
+        SyntaxKind[SyntaxKind["AsteriskAsteriskEqualsToken"] = 62] = "AsteriskAsteriskEqualsToken";
+        SyntaxKind[SyntaxKind["SlashEqualsToken"] = 63] = "SlashEqualsToken";
+        SyntaxKind[SyntaxKind["PercentEqualsToken"] = 64] = "PercentEqualsToken";
+        SyntaxKind[SyntaxKind["LessThanLessThanEqualsToken"] = 65] = "LessThanLessThanEqualsToken";
+        SyntaxKind[SyntaxKind["GreaterThanGreaterThanEqualsToken"] = 66] = "GreaterThanGreaterThanEqualsToken";
+        SyntaxKind[SyntaxKind["GreaterThanGreaterThanGreaterThanEqualsToken"] = 67] = "GreaterThanGreaterThanGreaterThanEqualsToken";
+        SyntaxKind[SyntaxKind["AmpersandEqualsToken"] = 68] = "AmpersandEqualsToken";
+        SyntaxKind[SyntaxKind["BarEqualsToken"] = 69] = "BarEqualsToken";
+        SyntaxKind[SyntaxKind["CaretEqualsToken"] = 70] = "CaretEqualsToken";
+        // Identifiers
+        SyntaxKind[SyntaxKind["Identifier"] = 71] = "Identifier";
+        // Reserved words
+        SyntaxKind[SyntaxKind["BreakKeyword"] = 72] = "BreakKeyword";
+        SyntaxKind[SyntaxKind["CaseKeyword"] = 73] = "CaseKeyword";
+        SyntaxKind[SyntaxKind["CatchKeyword"] = 74] = "CatchKeyword";
+        SyntaxKind[SyntaxKind["ClassKeyword"] = 75] = "ClassKeyword";
+        SyntaxKind[SyntaxKind["ConstKeyword"] = 76] = "ConstKeyword";
+        SyntaxKind[SyntaxKind["ContinueKeyword"] = 77] = "ContinueKeyword";
+        SyntaxKind[SyntaxKind["DebuggerKeyword"] = 78] = "DebuggerKeyword";
+        SyntaxKind[SyntaxKind["DefaultKeyword"] = 79] = "DefaultKeyword";
+        SyntaxKind[SyntaxKind["DeleteKeyword"] = 80] = "DeleteKeyword";
+        SyntaxKind[SyntaxKind["DoKeyword"] = 81] = "DoKeyword";
+        SyntaxKind[SyntaxKind["ElseKeyword"] = 82] = "ElseKeyword";
+        SyntaxKind[SyntaxKind["EnumKeyword"] = 83] = "EnumKeyword";
+        SyntaxKind[SyntaxKind["ExportKeyword"] = 84] = "ExportKeyword";
+        SyntaxKind[SyntaxKind["ExtendsKeyword"] = 85] = "ExtendsKeyword";
+        SyntaxKind[SyntaxKind["FalseKeyword"] = 86] = "FalseKeyword";
+        SyntaxKind[SyntaxKind["FinallyKeyword"] = 87] = "FinallyKeyword";
+        SyntaxKind[SyntaxKind["ForKeyword"] = 88] = "ForKeyword";
+        SyntaxKind[SyntaxKind["FunctionKeyword"] = 89] = "FunctionKeyword";
+        SyntaxKind[SyntaxKind["IfKeyword"] = 90] = "IfKeyword";
+        SyntaxKind[SyntaxKind["ImportKeyword"] = 91] = "ImportKeyword";
+        SyntaxKind[SyntaxKind["InKeyword"] = 92] = "InKeyword";
+        SyntaxKind[SyntaxKind["InstanceOfKeyword"] = 93] = "InstanceOfKeyword";
+        SyntaxKind[SyntaxKind["NewKeyword"] = 94] = "NewKeyword";
+        SyntaxKind[SyntaxKind["NullKeyword"] = 95] = "NullKeyword";
+        SyntaxKind[SyntaxKind["ReturnKeyword"] = 96] = "ReturnKeyword";
+        SyntaxKind[SyntaxKind["SuperKeyword"] = 97] = "SuperKeyword";
+        SyntaxKind[SyntaxKind["SwitchKeyword"] = 98] = "SwitchKeyword";
+        SyntaxKind[SyntaxKind["ThisKeyword"] = 99] = "ThisKeyword";
+        SyntaxKind[SyntaxKind["ThrowKeyword"] = 100] = "ThrowKeyword";
+        SyntaxKind[SyntaxKind["TrueKeyword"] = 101] = "TrueKeyword";
+        SyntaxKind[SyntaxKind["TryKeyword"] = 102] = "TryKeyword";
+        SyntaxKind[SyntaxKind["TypeOfKeyword"] = 103] = "TypeOfKeyword";
+        SyntaxKind[SyntaxKind["VarKeyword"] = 104] = "VarKeyword";
+        SyntaxKind[SyntaxKind["VoidKeyword"] = 105] = "VoidKeyword";
+        SyntaxKind[SyntaxKind["WhileKeyword"] = 106] = "WhileKeyword";
+        SyntaxKind[SyntaxKind["WithKeyword"] = 107] = "WithKeyword";
+        // Strict mode reserved words
+        SyntaxKind[SyntaxKind["ImplementsKeyword"] = 108] = "ImplementsKeyword";
+        SyntaxKind[SyntaxKind["InterfaceKeyword"] = 109] = "InterfaceKeyword";
+        SyntaxKind[SyntaxKind["LetKeyword"] = 110] = "LetKeyword";
+        SyntaxKind[SyntaxKind["PackageKeyword"] = 111] = "PackageKeyword";
+        SyntaxKind[SyntaxKind["PrivateKeyword"] = 112] = "PrivateKeyword";
+        SyntaxKind[SyntaxKind["ProtectedKeyword"] = 113] = "ProtectedKeyword";
+        SyntaxKind[SyntaxKind["PublicKeyword"] = 114] = "PublicKeyword";
+        SyntaxKind[SyntaxKind["StaticKeyword"] = 115] = "StaticKeyword";
+        SyntaxKind[SyntaxKind["YieldKeyword"] = 116] = "YieldKeyword";
+        // Contextual keywords
+        SyntaxKind[SyntaxKind["AbstractKeyword"] = 117] = "AbstractKeyword";
+        SyntaxKind[SyntaxKind["AsKeyword"] = 118] = "AsKeyword";
+        SyntaxKind[SyntaxKind["AnyKeyword"] = 119] = "AnyKeyword";
+        SyntaxKind[SyntaxKind["AsyncKeyword"] = 120] = "AsyncKeyword";
+        SyntaxKind[SyntaxKind["AwaitKeyword"] = 121] = "AwaitKeyword";
+        SyntaxKind[SyntaxKind["BooleanKeyword"] = 122] = "BooleanKeyword";
+        SyntaxKind[SyntaxKind["ConstructorKeyword"] = 123] = "ConstructorKeyword";
+        SyntaxKind[SyntaxKind["DeclareKeyword"] = 124] = "DeclareKeyword";
+        SyntaxKind[SyntaxKind["GetKeyword"] = 125] = "GetKeyword";
+        SyntaxKind[SyntaxKind["InferKeyword"] = 126] = "InferKeyword";
+        SyntaxKind[SyntaxKind["IsKeyword"] = 127] = "IsKeyword";
+        SyntaxKind[SyntaxKind["KeyOfKeyword"] = 128] = "KeyOfKeyword";
+        SyntaxKind[SyntaxKind["ModuleKeyword"] = 129] = "ModuleKeyword";
+        SyntaxKind[SyntaxKind["NamespaceKeyword"] = 130] = "NamespaceKeyword";
+        SyntaxKind[SyntaxKind["NeverKeyword"] = 131] = "NeverKeyword";
+        SyntaxKind[SyntaxKind["ReadonlyKeyword"] = 132] = "ReadonlyKeyword";
+        SyntaxKind[SyntaxKind["RequireKeyword"] = 133] = "RequireKeyword";
+        SyntaxKind[SyntaxKind["NumberKeyword"] = 134] = "NumberKeyword";
+        SyntaxKind[SyntaxKind["ObjectKeyword"] = 135] = "ObjectKeyword";
+        SyntaxKind[SyntaxKind["SetKeyword"] = 136] = "SetKeyword";
+        SyntaxKind[SyntaxKind["StringKeyword"] = 137] = "StringKeyword";
+        SyntaxKind[SyntaxKind["SymbolKeyword"] = 138] = "SymbolKeyword";
+        SyntaxKind[SyntaxKind["TypeKeyword"] = 139] = "TypeKeyword";
+        SyntaxKind[SyntaxKind["UndefinedKeyword"] = 140] = "UndefinedKeyword";
+        SyntaxKind[SyntaxKind["UniqueKeyword"] = 141] = "UniqueKeyword";
+        SyntaxKind[SyntaxKind["UnknownKeyword"] = 142] = "UnknownKeyword";
+        SyntaxKind[SyntaxKind["FromKeyword"] = 143] = "FromKeyword";
+        SyntaxKind[SyntaxKind["GlobalKeyword"] = 144] = "GlobalKeyword";
+        SyntaxKind[SyntaxKind["OfKeyword"] = 145] = "OfKeyword";
+        // Parse tree nodes
+        // Names
+        SyntaxKind[SyntaxKind["QualifiedName"] = 146] = "QualifiedName";
+        SyntaxKind[SyntaxKind["ComputedPropertyName"] = 147] = "ComputedPropertyName";
+        // Signature elements
+        SyntaxKind[SyntaxKind["TypeParameter"] = 148] = "TypeParameter";
+        SyntaxKind[SyntaxKind["Parameter"] = 149] = "Parameter";
+        SyntaxKind[SyntaxKind["Decorator"] = 150] = "Decorator";
+        // TypeMember
+        SyntaxKind[SyntaxKind["PropertySignature"] = 151] = "PropertySignature";
+        SyntaxKind[SyntaxKind["PropertyDeclaration"] = 152] = "PropertyDeclaration";
+        SyntaxKind[SyntaxKind["MethodSignature"] = 153] = "MethodSignature";
+        SyntaxKind[SyntaxKind["MethodDeclaration"] = 154] = "MethodDeclaration";
+        SyntaxKind[SyntaxKind["Constructor"] = 155] = "Constructor";
+        SyntaxKind[SyntaxKind["GetAccessor"] = 156] = "GetAccessor";
+        SyntaxKind[SyntaxKind["SetAccessor"] = 157] = "SetAccessor";
+        SyntaxKind[SyntaxKind["CallSignature"] = 158] = "CallSignature";
+        SyntaxKind[SyntaxKind["ConstructSignature"] = 159] = "ConstructSignature";
+        SyntaxKind[SyntaxKind["IndexSignature"] = 160] = "IndexSignature";
+        // Type
+        SyntaxKind[SyntaxKind["TypePredicate"] = 161] = "TypePredicate";
+        SyntaxKind[SyntaxKind["TypeReference"] = 162] = "TypeReference";
+        SyntaxKind[SyntaxKind["FunctionType"] = 163] = "FunctionType";
+        SyntaxKind[SyntaxKind["ConstructorType"] = 164] = "ConstructorType";
+        SyntaxKind[SyntaxKind["TypeQuery"] = 165] = "TypeQuery";
+        SyntaxKind[SyntaxKind["TypeLiteral"] = 166] = "TypeLiteral";
+        SyntaxKind[SyntaxKind["ArrayType"] = 167] = "ArrayType";
+        SyntaxKind[SyntaxKind["TupleType"] = 168] = "TupleType";
+        SyntaxKind[SyntaxKind["UnionType"] = 169] = "UnionType";
+        SyntaxKind[SyntaxKind["IntersectionType"] = 170] = "IntersectionType";
+        SyntaxKind[SyntaxKind["ConditionalType"] = 171] = "ConditionalType";
+        SyntaxKind[SyntaxKind["InferType"] = 172] = "InferType";
+        SyntaxKind[SyntaxKind["ParenthesizedType"] = 173] = "ParenthesizedType";
+        SyntaxKind[SyntaxKind["ThisType"] = 174] = "ThisType";
+        SyntaxKind[SyntaxKind["TypeOperator"] = 175] = "TypeOperator";
+        SyntaxKind[SyntaxKind["IndexedAccessType"] = 176] = "IndexedAccessType";
+        SyntaxKind[SyntaxKind["MappedType"] = 177] = "MappedType";
+        SyntaxKind[SyntaxKind["LiteralType"] = 178] = "LiteralType";
+        SyntaxKind[SyntaxKind["ImportType"] = 179] = "ImportType";
+        // Binding patterns
+        SyntaxKind[SyntaxKind["ObjectBindingPattern"] = 180] = "ObjectBindingPattern";
+        SyntaxKind[SyntaxKind["ArrayBindingPattern"] = 181] = "ArrayBindingPattern";
+        SyntaxKind[SyntaxKind["BindingElement"] = 182] = "BindingElement";
+        // Expression
+        SyntaxKind[SyntaxKind["ArrayLiteralExpression"] = 183] = "ArrayLiteralExpression";
+        SyntaxKind[SyntaxKind["ObjectLiteralExpression"] = 184] = "ObjectLiteralExpression";
+        SyntaxKind[SyntaxKind["PropertyAccessExpression"] = 185] = "PropertyAccessExpression";
+        SyntaxKind[SyntaxKind["ElementAccessExpression"] = 186] = "ElementAccessExpression";
+        SyntaxKind[SyntaxKind["CallExpression"] = 187] = "CallExpression";
+        SyntaxKind[SyntaxKind["NewExpression"] = 188] = "NewExpression";
+        SyntaxKind[SyntaxKind["TaggedTemplateExpression"] = 189] = "TaggedTemplateExpression";
+        SyntaxKind[SyntaxKind["TypeAssertionExpression"] = 190] = "TypeAssertionExpression";
+        SyntaxKind[SyntaxKind["ParenthesizedExpression"] = 191] = "ParenthesizedExpression";
+        SyntaxKind[SyntaxKind["FunctionExpression"] = 192] = "FunctionExpression";
+        SyntaxKind[SyntaxKind["ArrowFunction"] = 193] = "ArrowFunction";
+        SyntaxKind[SyntaxKind["DeleteExpression"] = 194] = "DeleteExpression";
+        SyntaxKind[SyntaxKind["TypeOfExpression"] = 195] = "TypeOfExpression";
+        SyntaxKind[SyntaxKind["VoidExpression"] = 196] = "VoidExpression";
+        SyntaxKind[SyntaxKind["AwaitExpression"] = 197] = "AwaitExpression";
+        SyntaxKind[SyntaxKind["PrefixUnaryExpression"] = 198] = "PrefixUnaryExpression";
+        SyntaxKind[SyntaxKind["PostfixUnaryExpression"] = 199] = "PostfixUnaryExpression";
+        SyntaxKind[SyntaxKind["BinaryExpression"] = 200] = "BinaryExpression";
+        SyntaxKind[SyntaxKind["ConditionalExpression"] = 201] = "ConditionalExpression";
+        SyntaxKind[SyntaxKind["TemplateExpression"] = 202] = "TemplateExpression";
+        SyntaxKind[SyntaxKind["YieldExpression"] = 203] = "YieldExpression";
+        SyntaxKind[SyntaxKind["SpreadElement"] = 204] = "SpreadElement";
+        SyntaxKind[SyntaxKind["ClassExpression"] = 205] = "ClassExpression";
+        SyntaxKind[SyntaxKind["OmittedExpression"] = 206] = "OmittedExpression";
+        SyntaxKind[SyntaxKind["ExpressionWithTypeArguments"] = 207] = "ExpressionWithTypeArguments";
+        SyntaxKind[SyntaxKind["AsExpression"] = 208] = "AsExpression";
+        SyntaxKind[SyntaxKind["NonNullExpression"] = 209] = "NonNullExpression";
+        SyntaxKind[SyntaxKind["MetaProperty"] = 210] = "MetaProperty";
+        // Misc
+        SyntaxKind[SyntaxKind["TemplateSpan"] = 211] = "TemplateSpan";
+        SyntaxKind[SyntaxKind["SemicolonClassElement"] = 212] = "SemicolonClassElement";
+        // Element
+        SyntaxKind[SyntaxKind["Block"] = 213] = "Block";
+        SyntaxKind[SyntaxKind["VariableStatement"] = 214] = "VariableStatement";
+        SyntaxKind[SyntaxKind["EmptyStatement"] = 215] = "EmptyStatement";
+        SyntaxKind[SyntaxKind["ExpressionStatement"] = 216] = "ExpressionStatement";
+        SyntaxKind[SyntaxKind["IfStatement"] = 217] = "IfStatement";
+        SyntaxKind[SyntaxKind["DoStatement"] = 218] = "DoStatement";
+        SyntaxKind[SyntaxKind["WhileStatement"] = 219] = "WhileStatement";
+        SyntaxKind[SyntaxKind["ForStatement"] = 220] = "ForStatement";
+        SyntaxKind[SyntaxKind["ForInStatement"] = 221] = "ForInStatement";
+        SyntaxKind[SyntaxKind["ForOfStatement"] = 222] = "ForOfStatement";
+        SyntaxKind[SyntaxKind["ContinueStatement"] = 223] = "ContinueStatement";
+        SyntaxKind[SyntaxKind["BreakStatement"] = 224] = "BreakStatement";
+        SyntaxKind[SyntaxKind["ReturnStatement"] = 225] = "ReturnStatement";
+        SyntaxKind[SyntaxKind["WithStatement"] = 226] = "WithStatement";
+        SyntaxKind[SyntaxKind["SwitchStatement"] = 227] = "SwitchStatement";
+        SyntaxKind[SyntaxKind["LabeledStatement"] = 228] = "LabeledStatement";
+        SyntaxKind[SyntaxKind["ThrowStatement"] = 229] = "ThrowStatement";
+        SyntaxKind[SyntaxKind["TryStatement"] = 230] = "TryStatement";
+        SyntaxKind[SyntaxKind["DebuggerStatement"] = 231] = "DebuggerStatement";
+        SyntaxKind[SyntaxKind["VariableDeclaration"] = 232] = "VariableDeclaration";
+        SyntaxKind[SyntaxKind["VariableDeclarationList"] = 233] = "VariableDeclarationList";
+        SyntaxKind[SyntaxKind["FunctionDeclaration"] = 234] = "FunctionDeclaration";
+        SyntaxKind[SyntaxKind["ClassDeclaration"] = 235] = "ClassDeclaration";
+        SyntaxKind[SyntaxKind["InterfaceDeclaration"] = 236] = "InterfaceDeclaration";
+        SyntaxKind[SyntaxKind["TypeAliasDeclaration"] = 237] = "TypeAliasDeclaration";
+        SyntaxKind[SyntaxKind["EnumDeclaration"] = 238] = "EnumDeclaration";
+        SyntaxKind[SyntaxKind["ModuleDeclaration"] = 239] = "ModuleDeclaration";
+        SyntaxKind[SyntaxKind["ModuleBlock"] = 240] = "ModuleBlock";
+        SyntaxKind[SyntaxKind["CaseBlock"] = 241] = "CaseBlock";
+        SyntaxKind[SyntaxKind["NamespaceExportDeclaration"] = 242] = "NamespaceExportDeclaration";
+        SyntaxKind[SyntaxKind["ImportEqualsDeclaration"] = 243] = "ImportEqualsDeclaration";
+        SyntaxKind[SyntaxKind["ImportDeclaration"] = 244] = "ImportDeclaration";
+        SyntaxKind[SyntaxKind["ImportClause"] = 245] = "ImportClause";
+        SyntaxKind[SyntaxKind["NamespaceImport"] = 246] = "NamespaceImport";
+        SyntaxKind[SyntaxKind["NamedImports"] = 247] = "NamedImports";
+        SyntaxKind[SyntaxKind["ImportSpecifier"] = 248] = "ImportSpecifier";
+        SyntaxKind[SyntaxKind["ExportAssignment"] = 249] = "ExportAssignment";
+        SyntaxKind[SyntaxKind["ExportDeclaration"] = 250] = "ExportDeclaration";
+        SyntaxKind[SyntaxKind["NamedExports"] = 251] = "NamedExports";
+        SyntaxKind[SyntaxKind["ExportSpecifier"] = 252] = "ExportSpecifier";
+        SyntaxKind[SyntaxKind["MissingDeclaration"] = 253] = "MissingDeclaration";
+        // Module references
+        SyntaxKind[SyntaxKind["ExternalModuleReference"] = 254] = "ExternalModuleReference";
+        // JSX
+        SyntaxKind[SyntaxKind["JsxElement"] = 255] = "JsxElement";
+        SyntaxKind[SyntaxKind["JsxSelfClosingElement"] = 256] = "JsxSelfClosingElement";
+        SyntaxKind[SyntaxKind["JsxOpeningElement"] = 257] = "JsxOpeningElement";
+        SyntaxKind[SyntaxKind["JsxClosingElement"] = 258] = "JsxClosingElement";
+        SyntaxKind[SyntaxKind["JsxFragment"] = 259] = "JsxFragment";
+        SyntaxKind[SyntaxKind["JsxOpeningFragment"] = 260] = "JsxOpeningFragment";
+        SyntaxKind[SyntaxKind["JsxClosingFragment"] = 261] = "JsxClosingFragment";
+        SyntaxKind[SyntaxKind["JsxAttribute"] = 262] = "JsxAttribute";
+        SyntaxKind[SyntaxKind["JsxAttributes"] = 263] = "JsxAttributes";
+        SyntaxKind[SyntaxKind["JsxSpreadAttribute"] = 264] = "JsxSpreadAttribute";
+        SyntaxKind[SyntaxKind["JsxExpression"] = 265] = "JsxExpression";
+        // Clauses
+        SyntaxKind[SyntaxKind["CaseClause"] = 266] = "CaseClause";
+        SyntaxKind[SyntaxKind["DefaultClause"] = 267] = "DefaultClause";
+        SyntaxKind[SyntaxKind["HeritageClause"] = 268] = "HeritageClause";
+        SyntaxKind[SyntaxKind["CatchClause"] = 269] = "CatchClause";
+        // Property assignments
+        SyntaxKind[SyntaxKind["PropertyAssignment"] = 270] = "PropertyAssignment";
+        SyntaxKind[SyntaxKind["ShorthandPropertyAssignment"] = 271] = "ShorthandPropertyAssignment";
+        SyntaxKind[SyntaxKind["SpreadAssignment"] = 272] = "SpreadAssignment";
+        // Enum
+        SyntaxKind[SyntaxKind["EnumMember"] = 273] = "EnumMember";
+        // Top-level nodes
+        SyntaxKind[SyntaxKind["SourceFile"] = 274] = "SourceFile";
+        SyntaxKind[SyntaxKind["Bundle"] = 275] = "Bundle";
+        SyntaxKind[SyntaxKind["UnparsedSource"] = 276] = "UnparsedSource";
+        SyntaxKind[SyntaxKind["InputFiles"] = 277] = "InputFiles";
+        // JSDoc nodes
+        SyntaxKind[SyntaxKind["JSDocTypeExpression"] = 278] = "JSDocTypeExpression";
+        // The * type
+        SyntaxKind[SyntaxKind["JSDocAllType"] = 279] = "JSDocAllType";
+        // The ? type
+        SyntaxKind[SyntaxKind["JSDocUnknownType"] = 280] = "JSDocUnknownType";
+        SyntaxKind[SyntaxKind["JSDocNullableType"] = 281] = "JSDocNullableType";
+        SyntaxKind[SyntaxKind["JSDocNonNullableType"] = 282] = "JSDocNonNullableType";
+        SyntaxKind[SyntaxKind["JSDocOptionalType"] = 283] = "JSDocOptionalType";
+        SyntaxKind[SyntaxKind["JSDocFunctionType"] = 284] = "JSDocFunctionType";
+        SyntaxKind[SyntaxKind["JSDocVariadicType"] = 285] = "JSDocVariadicType";
+        SyntaxKind[SyntaxKind["JSDocComment"] = 286] = "JSDocComment";
+        SyntaxKind[SyntaxKind["JSDocTypeLiteral"] = 287] = "JSDocTypeLiteral";
+        SyntaxKind[SyntaxKind["JSDocSignature"] = 288] = "JSDocSignature";
+        SyntaxKind[SyntaxKind["JSDocTag"] = 289] = "JSDocTag";
+        SyntaxKind[SyntaxKind["JSDocAugmentsTag"] = 290] = "JSDocAugmentsTag";
+        SyntaxKind[SyntaxKind["JSDocClassTag"] = 291] = "JSDocClassTag";
+        SyntaxKind[SyntaxKind["JSDocCallbackTag"] = 292] = "JSDocCallbackTag";
+        SyntaxKind[SyntaxKind["JSDocParameterTag"] = 293] = "JSDocParameterTag";
+        SyntaxKind[SyntaxKind["JSDocReturnTag"] = 294] = "JSDocReturnTag";
+        SyntaxKind[SyntaxKind["JSDocTypeTag"] = 295] = "JSDocTypeTag";
+        SyntaxKind[SyntaxKind["JSDocTemplateTag"] = 296] = "JSDocTemplateTag";
+        SyntaxKind[SyntaxKind["JSDocTypedefTag"] = 297] = "JSDocTypedefTag";
+        SyntaxKind[SyntaxKind["JSDocPropertyTag"] = 298] = "JSDocPropertyTag";
+        // Synthesized list
+        SyntaxKind[SyntaxKind["SyntaxList"] = 299] = "SyntaxList";
+        // Transformation nodes
+        SyntaxKind[SyntaxKind["NotEmittedStatement"] = 300] = "NotEmittedStatement";
+        SyntaxKind[SyntaxKind["PartiallyEmittedExpression"] = 301] = "PartiallyEmittedExpression";
+        SyntaxKind[SyntaxKind["CommaListExpression"] = 302] = "CommaListExpression";
+        SyntaxKind[SyntaxKind["MergeDeclarationMarker"] = 303] = "MergeDeclarationMarker";
+        SyntaxKind[SyntaxKind["EndOfDeclarationMarker"] = 304] = "EndOfDeclarationMarker";
+        // Enum value count
+        SyntaxKind[SyntaxKind["Count"] = 305] = "Count";
+        // Markers
+        SyntaxKind[SyntaxKind["FirstAssignment"] = 58] = "FirstAssignment";
+        SyntaxKind[SyntaxKind["LastAssignment"] = 70] = "LastAssignment";
+        SyntaxKind[SyntaxKind["FirstCompoundAssignment"] = 59] = "FirstCompoundAssignment";
+        SyntaxKind[SyntaxKind["LastCompoundAssignment"] = 70] = "LastCompoundAssignment";
+        SyntaxKind[SyntaxKind["FirstReservedWord"] = 72] = "FirstReservedWord";
+        SyntaxKind[SyntaxKind["LastReservedWord"] = 107] = "LastReservedWord";
+        SyntaxKind[SyntaxKind["FirstKeyword"] = 72] = "FirstKeyword";
+        SyntaxKind[SyntaxKind["LastKeyword"] = 145] = "LastKeyword";
+        SyntaxKind[SyntaxKind["FirstFutureReservedWord"] = 108] = "FirstFutureReservedWord";
+        SyntaxKind[SyntaxKind["LastFutureReservedWord"] = 116] = "LastFutureReservedWord";
+        SyntaxKind[SyntaxKind["FirstTypeNode"] = 161] = "FirstTypeNode";
+        SyntaxKind[SyntaxKind["LastTypeNode"] = 179] = "LastTypeNode";
+        SyntaxKind[SyntaxKind["FirstPunctuation"] = 17] = "FirstPunctuation";
+        SyntaxKind[SyntaxKind["LastPunctuation"] = 70] = "LastPunctuation";
+        SyntaxKind[SyntaxKind["FirstToken"] = 0] = "FirstToken";
+        SyntaxKind[SyntaxKind["LastToken"] = 145] = "LastToken";
+        SyntaxKind[SyntaxKind["FirstTriviaToken"] = 2] = "FirstTriviaToken";
+        SyntaxKind[SyntaxKind["LastTriviaToken"] = 7] = "LastTriviaToken";
+        SyntaxKind[SyntaxKind["FirstLiteralToken"] = 8] = "FirstLiteralToken";
+        SyntaxKind[SyntaxKind["LastLiteralToken"] = 13] = "LastLiteralToken";
+        SyntaxKind[SyntaxKind["FirstTemplateToken"] = 13] = "FirstTemplateToken";
+        SyntaxKind[SyntaxKind["LastTemplateToken"] = 16] = "LastTemplateToken";
+        SyntaxKind[SyntaxKind["FirstBinaryOperator"] = 27] = "FirstBinaryOperator";
+        SyntaxKind[SyntaxKind["LastBinaryOperator"] = 70] = "LastBinaryOperator";
+        SyntaxKind[SyntaxKind["FirstNode"] = 146] = "FirstNode";
+        SyntaxKind[SyntaxKind["FirstJSDocNode"] = 278] = "FirstJSDocNode";
+        SyntaxKind[SyntaxKind["LastJSDocNode"] = 298] = "LastJSDocNode";
+        SyntaxKind[SyntaxKind["FirstJSDocTagNode"] = 289] = "FirstJSDocTagNode";
+        SyntaxKind[SyntaxKind["LastJSDocTagNode"] = 298] = "LastJSDocTagNode";
+        /* @internal */ SyntaxKind[SyntaxKind["FirstContextualKeyword"] = 117] = "FirstContextualKeyword";
+        /* @internal */ SyntaxKind[SyntaxKind["LastContextualKeyword"] = 145] = "LastContextualKeyword";
+    })(SyntaxKind = ts.SyntaxKind || (ts.SyntaxKind = {}));
+    var NodeFlags;
+    (function (NodeFlags) {
+        NodeFlags[NodeFlags["None"] = 0] = "None";
+        NodeFlags[NodeFlags["Let"] = 1] = "Let";
+        NodeFlags[NodeFlags["Const"] = 2] = "Const";
+        NodeFlags[NodeFlags["NestedNamespace"] = 4] = "NestedNamespace";
+        NodeFlags[NodeFlags["Synthesized"] = 8] = "Synthesized";
+        NodeFlags[NodeFlags["Namespace"] = 16] = "Namespace";
+        NodeFlags[NodeFlags["ExportContext"] = 32] = "ExportContext";
+        NodeFlags[NodeFlags["ContainsThis"] = 64] = "ContainsThis";
+        NodeFlags[NodeFlags["HasImplicitReturn"] = 128] = "HasImplicitReturn";
+        NodeFlags[NodeFlags["HasExplicitReturn"] = 256] = "HasExplicitReturn";
+        NodeFlags[NodeFlags["GlobalAugmentation"] = 512] = "GlobalAugmentation";
+        NodeFlags[NodeFlags["HasAsyncFunctions"] = 1024] = "HasAsyncFunctions";
+        NodeFlags[NodeFlags["DisallowInContext"] = 2048] = "DisallowInContext";
+        NodeFlags[NodeFlags["YieldContext"] = 4096] = "YieldContext";
+        NodeFlags[NodeFlags["DecoratorContext"] = 8192] = "DecoratorContext";
+        NodeFlags[NodeFlags["AwaitContext"] = 16384] = "AwaitContext";
+        NodeFlags[NodeFlags["ThisNodeHasError"] = 32768] = "ThisNodeHasError";
+        NodeFlags[NodeFlags["JavaScriptFile"] = 65536] = "JavaScriptFile";
+        NodeFlags[NodeFlags["ThisNodeOrAnySubNodesHasError"] = 131072] = "ThisNodeOrAnySubNodesHasError";
+        NodeFlags[NodeFlags["HasAggregatedChildData"] = 262144] = "HasAggregatedChildData";
+        // These flags will be set when the parser encounters a dynamic import expression or 'import.meta' to avoid
+        // walking the tree if the flags are not set. However, these flags are just a approximation
+        // (hence why it's named "PossiblyContainsDynamicImport") because once set, the flags never get cleared.
+        // During editing, if a dynamic import is removed, incremental parsing will *NOT* clear this flag.
+        // This means that the tree will always be traversed during module resolution, or when looking for external module indicators.
+        // However, the removal operation should not occur often and in the case of the
+        // removal, it is likely that users will add the import anyway.
+        // The advantage of this approach is its simplicity. For the case of batch compilation,
+        // we guarantee that users won't have to pay the price of walking the tree if a dynamic import isn't used.
+        /* @internal */ NodeFlags[NodeFlags["PossiblyContainsDynamicImport"] = 524288] = "PossiblyContainsDynamicImport";
+        /* @internal */ NodeFlags[NodeFlags["PossiblyContainsImportMeta"] = 1048576] = "PossiblyContainsImportMeta";
+        NodeFlags[NodeFlags["JSDoc"] = 2097152] = "JSDoc";
+        /* @internal */ NodeFlags[NodeFlags["Ambient"] = 4194304] = "Ambient";
+        /* @internal */ NodeFlags[NodeFlags["InWithStatement"] = 8388608] = "InWithStatement";
+        NodeFlags[NodeFlags["JsonFile"] = 16777216] = "JsonFile";
+        NodeFlags[NodeFlags["BlockScoped"] = 3] = "BlockScoped";
+        NodeFlags[NodeFlags["ReachabilityCheckFlags"] = 384] = "ReachabilityCheckFlags";
+        NodeFlags[NodeFlags["ReachabilityAndEmitFlags"] = 1408] = "ReachabilityAndEmitFlags";
+        // Parsing context flags
+        NodeFlags[NodeFlags["ContextFlags"] = 12679168] = "ContextFlags";
+        // Exclude these flags when parsing a Type
+        NodeFlags[NodeFlags["TypeExcludesFlags"] = 20480] = "TypeExcludesFlags";
+        // Represents all flags that are potentially set once and
+        // never cleared on SourceFiles which get re-used in between incremental parses.
+        // See the comment above on `PossiblyContainsDynamicImport` and `PossiblyContainsImportMeta`.
+        /* @internal */ NodeFlags[NodeFlags["PermanentlySetIncrementalFlags"] = 1572864] = "PermanentlySetIncrementalFlags";
+    })(NodeFlags = ts.NodeFlags || (ts.NodeFlags = {}));
+    var ModifierFlags;
+    (function (ModifierFlags) {
+        ModifierFlags[ModifierFlags["None"] = 0] = "None";
+        ModifierFlags[ModifierFlags["Export"] = 1] = "Export";
+        ModifierFlags[ModifierFlags["Ambient"] = 2] = "Ambient";
+        ModifierFlags[ModifierFlags["Public"] = 4] = "Public";
+        ModifierFlags[ModifierFlags["Private"] = 8] = "Private";
+        ModifierFlags[ModifierFlags["Protected"] = 16] = "Protected";
+        ModifierFlags[ModifierFlags["Static"] = 32] = "Static";
+        ModifierFlags[ModifierFlags["Readonly"] = 64] = "Readonly";
+        ModifierFlags[ModifierFlags["Abstract"] = 128] = "Abstract";
+        ModifierFlags[ModifierFlags["Async"] = 256] = "Async";
+        ModifierFlags[ModifierFlags["Default"] = 512] = "Default";
+        ModifierFlags[ModifierFlags["Const"] = 2048] = "Const";
+        ModifierFlags[ModifierFlags["HasComputedFlags"] = 536870912] = "HasComputedFlags";
+        ModifierFlags[ModifierFlags["AccessibilityModifier"] = 28] = "AccessibilityModifier";
+        // Accessibility modifiers and 'readonly' can be attached to a parameter in a constructor to make it a property.
+        ModifierFlags[ModifierFlags["ParameterPropertyModifier"] = 92] = "ParameterPropertyModifier";
+        ModifierFlags[ModifierFlags["NonPublicAccessibilityModifier"] = 24] = "NonPublicAccessibilityModifier";
+        ModifierFlags[ModifierFlags["TypeScriptModifier"] = 2270] = "TypeScriptModifier";
+        ModifierFlags[ModifierFlags["ExportDefault"] = 513] = "ExportDefault";
+        ModifierFlags[ModifierFlags["All"] = 3071] = "All";
+    })(ModifierFlags = ts.ModifierFlags || (ts.ModifierFlags = {}));
+    var JsxFlags;
+    (function (JsxFlags) {
+        JsxFlags[JsxFlags["None"] = 0] = "None";
+        /** An element from a named property of the JSX.IntrinsicElements interface */
+        JsxFlags[JsxFlags["IntrinsicNamedElement"] = 1] = "IntrinsicNamedElement";
+        /** An element inferred from the string index signature of the JSX.IntrinsicElements interface */
+        JsxFlags[JsxFlags["IntrinsicIndexedElement"] = 2] = "IntrinsicIndexedElement";
+        JsxFlags[JsxFlags["IntrinsicElement"] = 3] = "IntrinsicElement";
+    })(JsxFlags = ts.JsxFlags || (ts.JsxFlags = {}));
+    /* @internal */
+    var RelationComparisonResult;
+    (function (RelationComparisonResult) {
+        RelationComparisonResult[RelationComparisonResult["Succeeded"] = 1] = "Succeeded";
+        RelationComparisonResult[RelationComparisonResult["Failed"] = 2] = "Failed";
+        RelationComparisonResult[RelationComparisonResult["FailedAndReported"] = 3] = "FailedAndReported";
+    })(RelationComparisonResult = ts.RelationComparisonResult || (ts.RelationComparisonResult = {}));
+    /*@internal*/
+    var GeneratedIdentifierFlags;
+    (function (GeneratedIdentifierFlags) {
+        // Kinds
+        GeneratedIdentifierFlags[GeneratedIdentifierFlags["None"] = 0] = "None";
+        GeneratedIdentifierFlags[GeneratedIdentifierFlags["Auto"] = 1] = "Auto";
+        GeneratedIdentifierFlags[GeneratedIdentifierFlags["Loop"] = 2] = "Loop";
+        GeneratedIdentifierFlags[GeneratedIdentifierFlags["Unique"] = 3] = "Unique";
+        GeneratedIdentifierFlags[GeneratedIdentifierFlags["Node"] = 4] = "Node";
+        GeneratedIdentifierFlags[GeneratedIdentifierFlags["KindMask"] = 7] = "KindMask";
+        // Flags
+        GeneratedIdentifierFlags[GeneratedIdentifierFlags["ReservedInNestedScopes"] = 8] = "ReservedInNestedScopes";
+        GeneratedIdentifierFlags[GeneratedIdentifierFlags["Optimistic"] = 16] = "Optimistic";
+        GeneratedIdentifierFlags[GeneratedIdentifierFlags["FileLevel"] = 32] = "FileLevel";
+    })(GeneratedIdentifierFlags = ts.GeneratedIdentifierFlags || (ts.GeneratedIdentifierFlags = {}));
+    /* @internal */
+    var TokenFlags;
+    (function (TokenFlags) {
+        TokenFlags[TokenFlags["None"] = 0] = "None";
+        TokenFlags[TokenFlags["PrecedingLineBreak"] = 1] = "PrecedingLineBreak";
+        TokenFlags[TokenFlags["PrecedingJSDocComment"] = 2] = "PrecedingJSDocComment";
+        TokenFlags[TokenFlags["Unterminated"] = 4] = "Unterminated";
+        TokenFlags[TokenFlags["ExtendedUnicodeEscape"] = 8] = "ExtendedUnicodeEscape";
+        TokenFlags[TokenFlags["Scientific"] = 16] = "Scientific";
+        TokenFlags[TokenFlags["Octal"] = 32] = "Octal";
+        TokenFlags[TokenFlags["HexSpecifier"] = 64] = "HexSpecifier";
+        TokenFlags[TokenFlags["BinarySpecifier"] = 128] = "BinarySpecifier";
+        TokenFlags[TokenFlags["OctalSpecifier"] = 256] = "OctalSpecifier";
+        TokenFlags[TokenFlags["ContainsSeparator"] = 512] = "ContainsSeparator";
+        TokenFlags[TokenFlags["BinaryOrOctalSpecifier"] = 384] = "BinaryOrOctalSpecifier";
+        TokenFlags[TokenFlags["NumericLiteralFlags"] = 1008] = "NumericLiteralFlags";
+    })(TokenFlags = ts.TokenFlags || (ts.TokenFlags = {}));
+    var FlowFlags;
+    (function (FlowFlags) {
+        FlowFlags[FlowFlags["Unreachable"] = 1] = "Unreachable";
+        FlowFlags[FlowFlags["Start"] = 2] = "Start";
+        FlowFlags[FlowFlags["BranchLabel"] = 4] = "BranchLabel";
+        FlowFlags[FlowFlags["LoopLabel"] = 8] = "LoopLabel";
+        FlowFlags[FlowFlags["Assignment"] = 16] = "Assignment";
+        FlowFlags[FlowFlags["TrueCondition"] = 32] = "TrueCondition";
+        FlowFlags[FlowFlags["FalseCondition"] = 64] = "FalseCondition";
+        FlowFlags[FlowFlags["SwitchClause"] = 128] = "SwitchClause";
+        FlowFlags[FlowFlags["ArrayMutation"] = 256] = "ArrayMutation";
+        FlowFlags[FlowFlags["Referenced"] = 512] = "Referenced";
+        FlowFlags[FlowFlags["Shared"] = 1024] = "Shared";
+        FlowFlags[FlowFlags["PreFinally"] = 2048] = "PreFinally";
+        FlowFlags[FlowFlags["AfterFinally"] = 4096] = "AfterFinally";
+        FlowFlags[FlowFlags["Label"] = 12] = "Label";
+        FlowFlags[FlowFlags["Condition"] = 96] = "Condition";
+    })(FlowFlags = ts.FlowFlags || (ts.FlowFlags = {}));
+    var OperationCanceledException = /** @class */ (function () {
+        function OperationCanceledException() {
+        }
+        return OperationCanceledException;
+    }());
+    ts.OperationCanceledException = OperationCanceledException;
+    /* @internal */
+    var StructureIsReused;
+    (function (StructureIsReused) {
+        StructureIsReused[StructureIsReused["Not"] = 0] = "Not";
+        StructureIsReused[StructureIsReused["SafeModules"] = 1] = "SafeModules";
+        StructureIsReused[StructureIsReused["Completely"] = 2] = "Completely";
+    })(StructureIsReused = ts.StructureIsReused || (ts.StructureIsReused = {}));
+    /** Return code used by getEmitOutput function to indicate status of the function */
+    var ExitStatus;
+    (function (ExitStatus) {
+        // Compiler ran successfully.  Either this was a simple do-nothing compilation (for example,
+        // when -version or -help was provided, or this was a normal compilation, no diagnostics
+        // were produced, and all outputs were generated successfully.
+        ExitStatus[ExitStatus["Success"] = 0] = "Success";
+        // Diagnostics were produced and because of them no code was generated.
+        ExitStatus[ExitStatus["DiagnosticsPresent_OutputsSkipped"] = 1] = "DiagnosticsPresent_OutputsSkipped";
+        // Diagnostics were produced and outputs were generated in spite of them.
+        ExitStatus[ExitStatus["DiagnosticsPresent_OutputsGenerated"] = 2] = "DiagnosticsPresent_OutputsGenerated";
+    })(ExitStatus = ts.ExitStatus || (ts.ExitStatus = {}));
+    /* @internal */
+    var UnionReduction;
+    (function (UnionReduction) {
+        UnionReduction[UnionReduction["None"] = 0] = "None";
+        UnionReduction[UnionReduction["Literal"] = 1] = "Literal";
+        UnionReduction[UnionReduction["Subtype"] = 2] = "Subtype";
+    })(UnionReduction = ts.UnionReduction || (ts.UnionReduction = {}));
+    var NodeBuilderFlags;
+    (function (NodeBuilderFlags) {
+        NodeBuilderFlags[NodeBuilderFlags["None"] = 0] = "None";
+        // Options
+        NodeBuilderFlags[NodeBuilderFlags["NoTruncation"] = 1] = "NoTruncation";
+        NodeBuilderFlags[NodeBuilderFlags["WriteArrayAsGenericType"] = 2] = "WriteArrayAsGenericType";
+        NodeBuilderFlags[NodeBuilderFlags["GenerateNamesForShadowedTypeParams"] = 4] = "GenerateNamesForShadowedTypeParams";
+        NodeBuilderFlags[NodeBuilderFlags["UseStructuralFallback"] = 8] = "UseStructuralFallback";
+        NodeBuilderFlags[NodeBuilderFlags["ForbidIndexedAccessSymbolReferences"] = 16] = "ForbidIndexedAccessSymbolReferences";
+        NodeBuilderFlags[NodeBuilderFlags["WriteTypeArgumentsOfSignature"] = 32] = "WriteTypeArgumentsOfSignature";
+        NodeBuilderFlags[NodeBuilderFlags["UseFullyQualifiedType"] = 64] = "UseFullyQualifiedType";
+        NodeBuilderFlags[NodeBuilderFlags["UseOnlyExternalAliasing"] = 128] = "UseOnlyExternalAliasing";
+        NodeBuilderFlags[NodeBuilderFlags["SuppressAnyReturnType"] = 256] = "SuppressAnyReturnType";
+        NodeBuilderFlags[NodeBuilderFlags["WriteTypeParametersInQualifiedName"] = 512] = "WriteTypeParametersInQualifiedName";
+        NodeBuilderFlags[NodeBuilderFlags["MultilineObjectLiterals"] = 1024] = "MultilineObjectLiterals";
+        NodeBuilderFlags[NodeBuilderFlags["WriteClassExpressionAsTypeLiteral"] = 2048] = "WriteClassExpressionAsTypeLiteral";
+        NodeBuilderFlags[NodeBuilderFlags["UseTypeOfFunction"] = 4096] = "UseTypeOfFunction";
+        NodeBuilderFlags[NodeBuilderFlags["OmitParameterModifiers"] = 8192] = "OmitParameterModifiers";
+        NodeBuilderFlags[NodeBuilderFlags["UseAliasDefinedOutsideCurrentScope"] = 16384] = "UseAliasDefinedOutsideCurrentScope";
+        // Error handling
+        NodeBuilderFlags[NodeBuilderFlags["AllowThisInObjectLiteral"] = 32768] = "AllowThisInObjectLiteral";
+        NodeBuilderFlags[NodeBuilderFlags["AllowQualifedNameInPlaceOfIdentifier"] = 65536] = "AllowQualifedNameInPlaceOfIdentifier";
+        NodeBuilderFlags[NodeBuilderFlags["AllowAnonymousIdentifier"] = 131072] = "AllowAnonymousIdentifier";
+        NodeBuilderFlags[NodeBuilderFlags["AllowEmptyUnionOrIntersection"] = 262144] = "AllowEmptyUnionOrIntersection";
+        NodeBuilderFlags[NodeBuilderFlags["AllowEmptyTuple"] = 524288] = "AllowEmptyTuple";
+        NodeBuilderFlags[NodeBuilderFlags["AllowUniqueESSymbolType"] = 1048576] = "AllowUniqueESSymbolType";
+        NodeBuilderFlags[NodeBuilderFlags["AllowEmptyIndexInfoType"] = 2097152] = "AllowEmptyIndexInfoType";
+        NodeBuilderFlags[NodeBuilderFlags["IgnoreErrors"] = 3112960] = "IgnoreErrors";
+        // State
+        NodeBuilderFlags[NodeBuilderFlags["InObjectTypeLiteral"] = 4194304] = "InObjectTypeLiteral";
+        NodeBuilderFlags[NodeBuilderFlags["InTypeAlias"] = 8388608] = "InTypeAlias";
+        NodeBuilderFlags[NodeBuilderFlags["InInitialEntityName"] = 16777216] = "InInitialEntityName";
+        NodeBuilderFlags[NodeBuilderFlags["InReverseMappedType"] = 33554432] = "InReverseMappedType";
+    })(NodeBuilderFlags = ts.NodeBuilderFlags || (ts.NodeBuilderFlags = {}));
+    // Ensure the shared flags between this and `NodeBuilderFlags` stay in alignment
+    var TypeFormatFlags;
+    (function (TypeFormatFlags) {
+        TypeFormatFlags[TypeFormatFlags["None"] = 0] = "None";
+        TypeFormatFlags[TypeFormatFlags["NoTruncation"] = 1] = "NoTruncation";
+        TypeFormatFlags[TypeFormatFlags["WriteArrayAsGenericType"] = 2] = "WriteArrayAsGenericType";
+        // hole because there's a hole in node builder flags
+        TypeFormatFlags[TypeFormatFlags["UseStructuralFallback"] = 8] = "UseStructuralFallback";
+        // hole because there's a hole in node builder flags
+        TypeFormatFlags[TypeFormatFlags["WriteTypeArgumentsOfSignature"] = 32] = "WriteTypeArgumentsOfSignature";
+        TypeFormatFlags[TypeFormatFlags["UseFullyQualifiedType"] = 64] = "UseFullyQualifiedType";
+        // hole because `UseOnlyExternalAliasing` is here in node builder flags, but functions which take old flags use `SymbolFormatFlags` instead
+        TypeFormatFlags[TypeFormatFlags["SuppressAnyReturnType"] = 256] = "SuppressAnyReturnType";
+        // hole because `WriteTypeParametersInQualifiedName` is here in node builder flags, but functions which take old flags use `SymbolFormatFlags` for this instead
+        TypeFormatFlags[TypeFormatFlags["MultilineObjectLiterals"] = 1024] = "MultilineObjectLiterals";
+        TypeFormatFlags[TypeFormatFlags["WriteClassExpressionAsTypeLiteral"] = 2048] = "WriteClassExpressionAsTypeLiteral";
+        TypeFormatFlags[TypeFormatFlags["UseTypeOfFunction"] = 4096] = "UseTypeOfFunction";
+        TypeFormatFlags[TypeFormatFlags["OmitParameterModifiers"] = 8192] = "OmitParameterModifiers";
+        TypeFormatFlags[TypeFormatFlags["UseAliasDefinedOutsideCurrentScope"] = 16384] = "UseAliasDefinedOutsideCurrentScope";
+        // even though `T` can't be accessed in the current scope.
+        // Error Handling
+        TypeFormatFlags[TypeFormatFlags["AllowUniqueESSymbolType"] = 1048576] = "AllowUniqueESSymbolType";
+        // TypeFormatFlags exclusive
+        TypeFormatFlags[TypeFormatFlags["AddUndefined"] = 131072] = "AddUndefined";
+        TypeFormatFlags[TypeFormatFlags["WriteArrowStyleSignature"] = 262144] = "WriteArrowStyleSignature";
+        // State
+        TypeFormatFlags[TypeFormatFlags["InArrayType"] = 524288] = "InArrayType";
+        TypeFormatFlags[TypeFormatFlags["InElementType"] = 2097152] = "InElementType";
+        TypeFormatFlags[TypeFormatFlags["InFirstTypeArgument"] = 4194304] = "InFirstTypeArgument";
+        TypeFormatFlags[TypeFormatFlags["InTypeAlias"] = 8388608] = "InTypeAlias";
+        /** @deprecated */ TypeFormatFlags[TypeFormatFlags["WriteOwnNameForAnyLike"] = 0] = "WriteOwnNameForAnyLike";
+        TypeFormatFlags[TypeFormatFlags["NodeBuilderFlagsMask"] = 9469291] = "NodeBuilderFlagsMask";
+    })(TypeFormatFlags = ts.TypeFormatFlags || (ts.TypeFormatFlags = {}));
+    var SymbolFormatFlags;
+    (function (SymbolFormatFlags) {
+        SymbolFormatFlags[SymbolFormatFlags["None"] = 0] = "None";
+        // Write symbols's type argument if it is instantiated symbol
+        // eg. class C<T> { p: T }   <-- Show p as C<T>.p here
+        //     var a: C<number>;
+        //     var p = a.p; <--- Here p is property of C<number> so show it as C<number>.p instead of just C.p
+        SymbolFormatFlags[SymbolFormatFlags["WriteTypeParametersOrArguments"] = 1] = "WriteTypeParametersOrArguments";
+        // Use only external alias information to get the symbol name in the given context
+        // eg.  module m { export class c { } } import x = m.c;
+        // When this flag is specified m.c will be used to refer to the class instead of alias symbol x
+        SymbolFormatFlags[SymbolFormatFlags["UseOnlyExternalAliasing"] = 2] = "UseOnlyExternalAliasing";
+        // Build symbol name using any nodes needed, instead of just components of an entity name
+        SymbolFormatFlags[SymbolFormatFlags["AllowAnyNodeKind"] = 4] = "AllowAnyNodeKind";
+        // Prefer aliases which are not directly visible
+        SymbolFormatFlags[SymbolFormatFlags["UseAliasDefinedOutsideCurrentScope"] = 8] = "UseAliasDefinedOutsideCurrentScope";
+    })(SymbolFormatFlags = ts.SymbolFormatFlags || (ts.SymbolFormatFlags = {}));
+    /* @internal */
+    var SymbolAccessibility;
+    (function (SymbolAccessibility) {
+        SymbolAccessibility[SymbolAccessibility["Accessible"] = 0] = "Accessible";
+        SymbolAccessibility[SymbolAccessibility["NotAccessible"] = 1] = "NotAccessible";
+        SymbolAccessibility[SymbolAccessibility["CannotBeNamed"] = 2] = "CannotBeNamed";
+    })(SymbolAccessibility = ts.SymbolAccessibility || (ts.SymbolAccessibility = {}));
+    /* @internal */
+    var SyntheticSymbolKind;
+    (function (SyntheticSymbolKind) {
+        SyntheticSymbolKind[SyntheticSymbolKind["UnionOrIntersection"] = 0] = "UnionOrIntersection";
+        SyntheticSymbolKind[SyntheticSymbolKind["Spread"] = 1] = "Spread";
+    })(SyntheticSymbolKind = ts.SyntheticSymbolKind || (ts.SyntheticSymbolKind = {}));
+    var TypePredicateKind;
+    (function (TypePredicateKind) {
+        TypePredicateKind[TypePredicateKind["This"] = 0] = "This";
+        TypePredicateKind[TypePredicateKind["Identifier"] = 1] = "Identifier";
+    })(TypePredicateKind = ts.TypePredicateKind || (ts.TypePredicateKind = {}));
+    /** Indicates how to serialize the name for a TypeReferenceNode when emitting decorator metadata */
+    /* @internal */
+    var TypeReferenceSerializationKind;
+    (function (TypeReferenceSerializationKind) {
+        TypeReferenceSerializationKind[TypeReferenceSerializationKind["Unknown"] = 0] = "Unknown";
+        // should be emitted using a safe fallback.
+        TypeReferenceSerializationKind[TypeReferenceSerializationKind["TypeWithConstructSignatureAndValue"] = 1] = "TypeWithConstructSignatureAndValue";
+        // function that can be reached at runtime (e.g. a `class`
+        // declaration or a `var` declaration for the static side
+        // of a type, such as the global `Promise` type in lib.d.ts).
+        TypeReferenceSerializationKind[TypeReferenceSerializationKind["VoidNullableOrNeverType"] = 2] = "VoidNullableOrNeverType";
+        TypeReferenceSerializationKind[TypeReferenceSerializationKind["NumberLikeType"] = 3] = "NumberLikeType";
+        TypeReferenceSerializationKind[TypeReferenceSerializationKind["StringLikeType"] = 4] = "StringLikeType";
+        TypeReferenceSerializationKind[TypeReferenceSerializationKind["BooleanType"] = 5] = "BooleanType";
+        TypeReferenceSerializationKind[TypeReferenceSerializationKind["ArrayLikeType"] = 6] = "ArrayLikeType";
+        TypeReferenceSerializationKind[TypeReferenceSerializationKind["ESSymbolType"] = 7] = "ESSymbolType";
+        TypeReferenceSerializationKind[TypeReferenceSerializationKind["Promise"] = 8] = "Promise";
+        TypeReferenceSerializationKind[TypeReferenceSerializationKind["TypeWithCallSignature"] = 9] = "TypeWithCallSignature";
+        // with call signatures.
+        TypeReferenceSerializationKind[TypeReferenceSerializationKind["ObjectType"] = 10] = "ObjectType";
+    })(TypeReferenceSerializationKind = ts.TypeReferenceSerializationKind || (ts.TypeReferenceSerializationKind = {}));
+    var SymbolFlags;
+    (function (SymbolFlags) {
+        SymbolFlags[SymbolFlags["None"] = 0] = "None";
+        SymbolFlags[SymbolFlags["FunctionScopedVariable"] = 1] = "FunctionScopedVariable";
+        SymbolFlags[SymbolFlags["BlockScopedVariable"] = 2] = "BlockScopedVariable";
+        SymbolFlags[SymbolFlags["Property"] = 4] = "Property";
+        SymbolFlags[SymbolFlags["EnumMember"] = 8] = "EnumMember";
+        SymbolFlags[SymbolFlags["Function"] = 16] = "Function";
+        SymbolFlags[SymbolFlags["Class"] = 32] = "Class";
+        SymbolFlags[SymbolFlags["Interface"] = 64] = "Interface";
+        SymbolFlags[SymbolFlags["ConstEnum"] = 128] = "ConstEnum";
+        SymbolFlags[SymbolFlags["RegularEnum"] = 256] = "RegularEnum";
+        SymbolFlags[SymbolFlags["ValueModule"] = 512] = "ValueModule";
+        SymbolFlags[SymbolFlags["NamespaceModule"] = 1024] = "NamespaceModule";
+        SymbolFlags[SymbolFlags["TypeLiteral"] = 2048] = "TypeLiteral";
+        SymbolFlags[SymbolFlags["ObjectLiteral"] = 4096] = "ObjectLiteral";
+        SymbolFlags[SymbolFlags["Method"] = 8192] = "Method";
+        SymbolFlags[SymbolFlags["Constructor"] = 16384] = "Constructor";
+        SymbolFlags[SymbolFlags["GetAccessor"] = 32768] = "GetAccessor";
+        SymbolFlags[SymbolFlags["SetAccessor"] = 65536] = "SetAccessor";
+        SymbolFlags[SymbolFlags["Signature"] = 131072] = "Signature";
+        SymbolFlags[SymbolFlags["TypeParameter"] = 262144] = "TypeParameter";
+        SymbolFlags[SymbolFlags["TypeAlias"] = 524288] = "TypeAlias";
+        SymbolFlags[SymbolFlags["ExportValue"] = 1048576] = "ExportValue";
+        SymbolFlags[SymbolFlags["Alias"] = 2097152] = "Alias";
+        SymbolFlags[SymbolFlags["Prototype"] = 4194304] = "Prototype";
+        SymbolFlags[SymbolFlags["ExportStar"] = 8388608] = "ExportStar";
+        SymbolFlags[SymbolFlags["Optional"] = 16777216] = "Optional";
+        SymbolFlags[SymbolFlags["Transient"] = 33554432] = "Transient";
+        SymbolFlags[SymbolFlags["JSContainer"] = 67108864] = "JSContainer";
+        /* @internal */
+        SymbolFlags[SymbolFlags["All"] = 67108863] = "All";
+        SymbolFlags[SymbolFlags["Enum"] = 384] = "Enum";
+        SymbolFlags[SymbolFlags["Variable"] = 3] = "Variable";
+        SymbolFlags[SymbolFlags["Value"] = 67216319] = "Value";
+        SymbolFlags[SymbolFlags["Type"] = 67901928] = "Type";
+        SymbolFlags[SymbolFlags["Namespace"] = 1920] = "Namespace";
+        SymbolFlags[SymbolFlags["Module"] = 1536] = "Module";
+        SymbolFlags[SymbolFlags["Accessor"] = 98304] = "Accessor";
+        // Variables can be redeclared, but can not redeclare a block-scoped declaration with the
+        // same name, or any other value that is not a variable, e.g. ValueModule or Class
+        SymbolFlags[SymbolFlags["FunctionScopedVariableExcludes"] = 67216318] = "FunctionScopedVariableExcludes";
+        // Block-scoped declarations are not allowed to be re-declared
+        // they can not merge with anything in the value space
+        SymbolFlags[SymbolFlags["BlockScopedVariableExcludes"] = 67216319] = "BlockScopedVariableExcludes";
+        SymbolFlags[SymbolFlags["ParameterExcludes"] = 67216319] = "ParameterExcludes";
+        SymbolFlags[SymbolFlags["PropertyExcludes"] = 0] = "PropertyExcludes";
+        SymbolFlags[SymbolFlags["EnumMemberExcludes"] = 68008959] = "EnumMemberExcludes";
+        SymbolFlags[SymbolFlags["FunctionExcludes"] = 67215791] = "FunctionExcludes";
+        SymbolFlags[SymbolFlags["ClassExcludes"] = 68008383] = "ClassExcludes";
+        SymbolFlags[SymbolFlags["InterfaceExcludes"] = 67901832] = "InterfaceExcludes";
+        SymbolFlags[SymbolFlags["RegularEnumExcludes"] = 68008191] = "RegularEnumExcludes";
+        SymbolFlags[SymbolFlags["ConstEnumExcludes"] = 68008831] = "ConstEnumExcludes";
+        SymbolFlags[SymbolFlags["ValueModuleExcludes"] = 67215503] = "ValueModuleExcludes";
+        SymbolFlags[SymbolFlags["NamespaceModuleExcludes"] = 0] = "NamespaceModuleExcludes";
+        SymbolFlags[SymbolFlags["MethodExcludes"] = 67208127] = "MethodExcludes";
+        SymbolFlags[SymbolFlags["GetAccessorExcludes"] = 67150783] = "GetAccessorExcludes";
+        SymbolFlags[SymbolFlags["SetAccessorExcludes"] = 67183551] = "SetAccessorExcludes";
+        SymbolFlags[SymbolFlags["TypeParameterExcludes"] = 67639784] = "TypeParameterExcludes";
+        SymbolFlags[SymbolFlags["TypeAliasExcludes"] = 67901928] = "TypeAliasExcludes";
+        SymbolFlags[SymbolFlags["AliasExcludes"] = 2097152] = "AliasExcludes";
+        SymbolFlags[SymbolFlags["ModuleMember"] = 2623475] = "ModuleMember";
+        SymbolFlags[SymbolFlags["ExportHasLocal"] = 944] = "ExportHasLocal";
+        SymbolFlags[SymbolFlags["HasExports"] = 1952] = "HasExports";
+        SymbolFlags[SymbolFlags["HasMembers"] = 6240] = "HasMembers";
+        SymbolFlags[SymbolFlags["BlockScoped"] = 418] = "BlockScoped";
+        SymbolFlags[SymbolFlags["PropertyOrAccessor"] = 98308] = "PropertyOrAccessor";
+        SymbolFlags[SymbolFlags["ClassMember"] = 106500] = "ClassMember";
+        /* @internal */
+        // The set of things we consider semantically classifiable.  Used to speed up the LS during
+        // classification.
+        SymbolFlags[SymbolFlags["Classifiable"] = 2885600] = "Classifiable";
+        /* @internal */
+        SymbolFlags[SymbolFlags["LateBindingContainer"] = 6240] = "LateBindingContainer";
+    })(SymbolFlags = ts.SymbolFlags || (ts.SymbolFlags = {}));
+    /* @internal */
+    var EnumKind;
+    (function (EnumKind) {
+        EnumKind[EnumKind["Numeric"] = 0] = "Numeric";
+        EnumKind[EnumKind["Literal"] = 1] = "Literal"; // Literal enum (each member has a TypeFlags.EnumLiteral type)
+    })(EnumKind = ts.EnumKind || (ts.EnumKind = {}));
+    /* @internal */
+    var CheckFlags;
+    (function (CheckFlags) {
+        CheckFlags[CheckFlags["Instantiated"] = 1] = "Instantiated";
+        CheckFlags[CheckFlags["SyntheticProperty"] = 2] = "SyntheticProperty";
+        CheckFlags[CheckFlags["SyntheticMethod"] = 4] = "SyntheticMethod";
+        CheckFlags[CheckFlags["Readonly"] = 8] = "Readonly";
+        CheckFlags[CheckFlags["Partial"] = 16] = "Partial";
+        CheckFlags[CheckFlags["HasNonUniformType"] = 32] = "HasNonUniformType";
+        CheckFlags[CheckFlags["ContainsPublic"] = 64] = "ContainsPublic";
+        CheckFlags[CheckFlags["ContainsProtected"] = 128] = "ContainsProtected";
+        CheckFlags[CheckFlags["ContainsPrivate"] = 256] = "ContainsPrivate";
+        CheckFlags[CheckFlags["ContainsStatic"] = 512] = "ContainsStatic";
+        CheckFlags[CheckFlags["Late"] = 1024] = "Late";
+        CheckFlags[CheckFlags["ReverseMapped"] = 2048] = "ReverseMapped";
+        CheckFlags[CheckFlags["Synthetic"] = 6] = "Synthetic";
+    })(CheckFlags = ts.CheckFlags || (ts.CheckFlags = {}));
+    var InternalSymbolName;
+    (function (InternalSymbolName) {
+        InternalSymbolName["Call"] = "__call";
+        InternalSymbolName["Constructor"] = "__constructor";
+        InternalSymbolName["New"] = "__new";
+        InternalSymbolName["Index"] = "__index";
+        InternalSymbolName["ExportStar"] = "__export";
+        InternalSymbolName["Global"] = "__global";
+        InternalSymbolName["Missing"] = "__missing";
+        InternalSymbolName["Type"] = "__type";
+        InternalSymbolName["Object"] = "__object";
+        InternalSymbolName["JSXAttributes"] = "__jsxAttributes";
+        InternalSymbolName["Class"] = "__class";
+        InternalSymbolName["Function"] = "__function";
+        InternalSymbolName["Computed"] = "__computed";
+        InternalSymbolName["Resolving"] = "__resolving__";
+        InternalSymbolName["ExportEquals"] = "export=";
+        InternalSymbolName["Default"] = "default";
+    })(InternalSymbolName = ts.InternalSymbolName || (ts.InternalSymbolName = {}));
+    /* @internal */
+    var NodeCheckFlags;
+    (function (NodeCheckFlags) {
+        NodeCheckFlags[NodeCheckFlags["TypeChecked"] = 1] = "TypeChecked";
+        NodeCheckFlags[NodeCheckFlags["LexicalThis"] = 2] = "LexicalThis";
+        NodeCheckFlags[NodeCheckFlags["CaptureThis"] = 4] = "CaptureThis";
+        NodeCheckFlags[NodeCheckFlags["CaptureNewTarget"] = 8] = "CaptureNewTarget";
+        NodeCheckFlags[NodeCheckFlags["SuperInstance"] = 256] = "SuperInstance";
+        NodeCheckFlags[NodeCheckFlags["SuperStatic"] = 512] = "SuperStatic";
+        NodeCheckFlags[NodeCheckFlags["ContextChecked"] = 1024] = "ContextChecked";
+        NodeCheckFlags[NodeCheckFlags["AsyncMethodWithSuper"] = 2048] = "AsyncMethodWithSuper";
+        NodeCheckFlags[NodeCheckFlags["AsyncMethodWithSuperBinding"] = 4096] = "AsyncMethodWithSuperBinding";
+        NodeCheckFlags[NodeCheckFlags["CaptureArguments"] = 8192] = "CaptureArguments";
+        NodeCheckFlags[NodeCheckFlags["EnumValuesComputed"] = 16384] = "EnumValuesComputed";
+        NodeCheckFlags[NodeCheckFlags["LexicalModuleMergesWithClass"] = 32768] = "LexicalModuleMergesWithClass";
+        NodeCheckFlags[NodeCheckFlags["LoopWithCapturedBlockScopedBinding"] = 65536] = "LoopWithCapturedBlockScopedBinding";
+        NodeCheckFlags[NodeCheckFlags["CapturedBlockScopedBinding"] = 131072] = "CapturedBlockScopedBinding";
+        NodeCheckFlags[NodeCheckFlags["BlockScopedBindingInLoop"] = 262144] = "BlockScopedBindingInLoop";
+        NodeCheckFlags[NodeCheckFlags["ClassWithBodyScopedClassBinding"] = 524288] = "ClassWithBodyScopedClassBinding";
+        NodeCheckFlags[NodeCheckFlags["BodyScopedClassBinding"] = 1048576] = "BodyScopedClassBinding";
+        NodeCheckFlags[NodeCheckFlags["NeedsLoopOutParameter"] = 2097152] = "NeedsLoopOutParameter";
+        NodeCheckFlags[NodeCheckFlags["AssignmentsMarked"] = 4194304] = "AssignmentsMarked";
+        NodeCheckFlags[NodeCheckFlags["ClassWithConstructorReference"] = 8388608] = "ClassWithConstructorReference";
+        NodeCheckFlags[NodeCheckFlags["ConstructorReferenceInClass"] = 16777216] = "ConstructorReferenceInClass";
+    })(NodeCheckFlags = ts.NodeCheckFlags || (ts.NodeCheckFlags = {}));
+    var TypeFlags;
+    (function (TypeFlags) {
+        TypeFlags[TypeFlags["Any"] = 1] = "Any";
+        TypeFlags[TypeFlags["Unknown"] = 2] = "Unknown";
+        TypeFlags[TypeFlags["String"] = 4] = "String";
+        TypeFlags[TypeFlags["Number"] = 8] = "Number";
+        TypeFlags[TypeFlags["Boolean"] = 16] = "Boolean";
+        TypeFlags[TypeFlags["Enum"] = 32] = "Enum";
+        TypeFlags[TypeFlags["StringLiteral"] = 64] = "StringLiteral";
+        TypeFlags[TypeFlags["NumberLiteral"] = 128] = "NumberLiteral";
+        TypeFlags[TypeFlags["BooleanLiteral"] = 256] = "BooleanLiteral";
+        TypeFlags[TypeFlags["EnumLiteral"] = 512] = "EnumLiteral";
+        TypeFlags[TypeFlags["ESSymbol"] = 1024] = "ESSymbol";
+        TypeFlags[TypeFlags["UniqueESSymbol"] = 2048] = "UniqueESSymbol";
+        TypeFlags[TypeFlags["Void"] = 4096] = "Void";
+        TypeFlags[TypeFlags["Undefined"] = 8192] = "Undefined";
+        TypeFlags[TypeFlags["Null"] = 16384] = "Null";
+        TypeFlags[TypeFlags["Never"] = 32768] = "Never";
+        TypeFlags[TypeFlags["TypeParameter"] = 65536] = "TypeParameter";
+        TypeFlags[TypeFlags["Object"] = 131072] = "Object";
+        TypeFlags[TypeFlags["Union"] = 262144] = "Union";
+        TypeFlags[TypeFlags["Intersection"] = 524288] = "Intersection";
+        TypeFlags[TypeFlags["Index"] = 1048576] = "Index";
+        TypeFlags[TypeFlags["IndexedAccess"] = 2097152] = "IndexedAccess";
+        TypeFlags[TypeFlags["Conditional"] = 4194304] = "Conditional";
+        TypeFlags[TypeFlags["Substitution"] = 8388608] = "Substitution";
+        TypeFlags[TypeFlags["NonPrimitive"] = 16777216] = "NonPrimitive";
+        /* @internal */
+        TypeFlags[TypeFlags["FreshLiteral"] = 33554432] = "FreshLiteral";
+        /* @internal */
+        TypeFlags[TypeFlags["UnionOfUnitTypes"] = 67108864] = "UnionOfUnitTypes";
+        /* @internal */
+        TypeFlags[TypeFlags["ContainsWideningType"] = 134217728] = "ContainsWideningType";
+        /* @internal */
+        TypeFlags[TypeFlags["ContainsObjectLiteral"] = 268435456] = "ContainsObjectLiteral";
+        /* @internal */
+        TypeFlags[TypeFlags["ContainsAnyFunctionType"] = 536870912] = "ContainsAnyFunctionType";
+        /* @internal */
+        TypeFlags[TypeFlags["AnyOrUnknown"] = 3] = "AnyOrUnknown";
+        /* @internal */
+        TypeFlags[TypeFlags["Nullable"] = 24576] = "Nullable";
+        TypeFlags[TypeFlags["Literal"] = 448] = "Literal";
+        TypeFlags[TypeFlags["Unit"] = 27072] = "Unit";
+        TypeFlags[TypeFlags["StringOrNumberLiteral"] = 192] = "StringOrNumberLiteral";
+        /* @internal */
+        TypeFlags[TypeFlags["StringOrNumberLiteralOrUnique"] = 2240] = "StringOrNumberLiteralOrUnique";
+        /* @internal */
+        TypeFlags[TypeFlags["DefinitelyFalsy"] = 29120] = "DefinitelyFalsy";
+        TypeFlags[TypeFlags["PossiblyFalsy"] = 29148] = "PossiblyFalsy";
+        /* @internal */
+        TypeFlags[TypeFlags["Intrinsic"] = 16839967] = "Intrinsic";
+        /* @internal */
+        TypeFlags[TypeFlags["Primitive"] = 32764] = "Primitive";
+        TypeFlags[TypeFlags["StringLike"] = 68] = "StringLike";
+        TypeFlags[TypeFlags["NumberLike"] = 168] = "NumberLike";
+        TypeFlags[TypeFlags["BooleanLike"] = 272] = "BooleanLike";
+        TypeFlags[TypeFlags["EnumLike"] = 544] = "EnumLike";
+        TypeFlags[TypeFlags["ESSymbolLike"] = 3072] = "ESSymbolLike";
+        TypeFlags[TypeFlags["VoidLike"] = 12288] = "VoidLike";
+        /* @internal */
+        TypeFlags[TypeFlags["DisjointDomains"] = 16809468] = "DisjointDomains";
+        TypeFlags[TypeFlags["UnionOrIntersection"] = 786432] = "UnionOrIntersection";
+        TypeFlags[TypeFlags["StructuredType"] = 917504] = "StructuredType";
+        TypeFlags[TypeFlags["TypeVariable"] = 2162688] = "TypeVariable";
+        TypeFlags[TypeFlags["InstantiableNonPrimitive"] = 14745600] = "InstantiableNonPrimitive";
+        TypeFlags[TypeFlags["InstantiablePrimitive"] = 1048576] = "InstantiablePrimitive";
+        TypeFlags[TypeFlags["Instantiable"] = 15794176] = "Instantiable";
+        TypeFlags[TypeFlags["StructuredOrInstantiable"] = 16711680] = "StructuredOrInstantiable";
+        // 'Narrowable' types are types where narrowing actually narrows.
+        // This *should* be every type other than null, undefined, void, and never
+        TypeFlags[TypeFlags["Narrowable"] = 33492479] = "Narrowable";
+        TypeFlags[TypeFlags["NotUnionOrUnit"] = 16909315] = "NotUnionOrUnit";
+        /* @internal */
+        TypeFlags[TypeFlags["NotUnit"] = 16749629] = "NotUnit";
+        /* @internal */
+        TypeFlags[TypeFlags["RequiresWidening"] = 402653184] = "RequiresWidening";
+        /* @internal */
+        TypeFlags[TypeFlags["PropagatingFlags"] = 939524096] = "PropagatingFlags";
+        // The following flags are used for different purposes during union and intersection type construction
+        /* @internal */
+        TypeFlags[TypeFlags["NonWideningType"] = 134217728] = "NonWideningType";
+        /* @internal */
+        TypeFlags[TypeFlags["Wildcard"] = 268435456] = "Wildcard";
+        /* @internal */
+        TypeFlags[TypeFlags["EmptyObject"] = 536870912] = "EmptyObject";
+        /* @internal */
+        TypeFlags[TypeFlags["ConstructionFlags"] = 939524096] = "ConstructionFlags";
+        // The following flag is used for different purposes by maybeTypeOfKind
+        /* @internal */
+        TypeFlags[TypeFlags["GenericMappedType"] = 134217728] = "GenericMappedType";
+    })(TypeFlags = ts.TypeFlags || (ts.TypeFlags = {}));
+    var ObjectFlags;
+    (function (ObjectFlags) {
+        ObjectFlags[ObjectFlags["Class"] = 1] = "Class";
+        ObjectFlags[ObjectFlags["Interface"] = 2] = "Interface";
+        ObjectFlags[ObjectFlags["Reference"] = 4] = "Reference";
+        ObjectFlags[ObjectFlags["Tuple"] = 8] = "Tuple";
+        ObjectFlags[ObjectFlags["Anonymous"] = 16] = "Anonymous";
+        ObjectFlags[ObjectFlags["Mapped"] = 32] = "Mapped";
+        ObjectFlags[ObjectFlags["Instantiated"] = 64] = "Instantiated";
+        ObjectFlags[ObjectFlags["ObjectLiteral"] = 128] = "ObjectLiteral";
+        ObjectFlags[ObjectFlags["EvolvingArray"] = 256] = "EvolvingArray";
+        ObjectFlags[ObjectFlags["ObjectLiteralPatternWithComputedProperties"] = 512] = "ObjectLiteralPatternWithComputedProperties";
+        ObjectFlags[ObjectFlags["ContainsSpread"] = 1024] = "ContainsSpread";
+        ObjectFlags[ObjectFlags["ReverseMapped"] = 2048] = "ReverseMapped";
+        ObjectFlags[ObjectFlags["JsxAttributes"] = 4096] = "JsxAttributes";
+        ObjectFlags[ObjectFlags["MarkerType"] = 8192] = "MarkerType";
+        ObjectFlags[ObjectFlags["ClassOrInterface"] = 3] = "ClassOrInterface";
+    })(ObjectFlags = ts.ObjectFlags || (ts.ObjectFlags = {}));
+    /* @internal */
+    var Variance;
+    (function (Variance) {
+        Variance[Variance["Invariant"] = 0] = "Invariant";
+        Variance[Variance["Covariant"] = 1] = "Covariant";
+        Variance[Variance["Contravariant"] = 2] = "Contravariant";
+        Variance[Variance["Bivariant"] = 3] = "Bivariant";
+        Variance[Variance["Independent"] = 4] = "Independent";
+    })(Variance = ts.Variance || (ts.Variance = {}));
+    var SignatureKind;
+    (function (SignatureKind) {
+        SignatureKind[SignatureKind["Call"] = 0] = "Call";
+        SignatureKind[SignatureKind["Construct"] = 1] = "Construct";
+    })(SignatureKind = ts.SignatureKind || (ts.SignatureKind = {}));
+    var IndexKind;
+    (function (IndexKind) {
+        IndexKind[IndexKind["String"] = 0] = "String";
+        IndexKind[IndexKind["Number"] = 1] = "Number";
+    })(IndexKind = ts.IndexKind || (ts.IndexKind = {}));
+    var InferencePriority;
+    (function (InferencePriority) {
+        InferencePriority[InferencePriority["NakedTypeVariable"] = 1] = "NakedTypeVariable";
+        InferencePriority[InferencePriority["HomomorphicMappedType"] = 2] = "HomomorphicMappedType";
+        InferencePriority[InferencePriority["MappedTypeConstraint"] = 4] = "MappedTypeConstraint";
+        InferencePriority[InferencePriority["ReturnType"] = 8] = "ReturnType";
+        InferencePriority[InferencePriority["LiteralKeyof"] = 16] = "LiteralKeyof";
+        InferencePriority[InferencePriority["NoConstraints"] = 32] = "NoConstraints";
+        InferencePriority[InferencePriority["AlwaysStrict"] = 64] = "AlwaysStrict";
+        InferencePriority[InferencePriority["PriorityImpliesCombination"] = 28] = "PriorityImpliesCombination";
+    })(InferencePriority = ts.InferencePriority || (ts.InferencePriority = {}));
+    /* @internal */
+    var InferenceFlags;
+    (function (InferenceFlags) {
+        InferenceFlags[InferenceFlags["None"] = 0] = "None";
+        InferenceFlags[InferenceFlags["InferUnionTypes"] = 1] = "InferUnionTypes";
+        InferenceFlags[InferenceFlags["NoDefault"] = 2] = "NoDefault";
+        InferenceFlags[InferenceFlags["AnyDefault"] = 4] = "AnyDefault";
+    })(InferenceFlags = ts.InferenceFlags || (ts.InferenceFlags = {}));
+    /**
+     * Ternary values are defined such that
+     * x & y is False if either x or y is False.
+     * x & y is Maybe if either x or y is Maybe, but neither x or y is False.
+     * x & y is True if both x and y are True.
+     * x | y is False if both x and y are False.
+     * x | y is Maybe if either x or y is Maybe, but neither x or y is True.
+     * x | y is True if either x or y is True.
+     */
+    /* @internal */
+    var Ternary;
+    (function (Ternary) {
+        Ternary[Ternary["False"] = 0] = "False";
+        Ternary[Ternary["Maybe"] = 1] = "Maybe";
+        Ternary[Ternary["True"] = -1] = "True";
+    })(Ternary = ts.Ternary || (ts.Ternary = {}));
+    /* @internal */
+    var SpecialPropertyAssignmentKind;
+    (function (SpecialPropertyAssignmentKind) {
+        SpecialPropertyAssignmentKind[SpecialPropertyAssignmentKind["None"] = 0] = "None";
+        /// exports.name = expr
+        SpecialPropertyAssignmentKind[SpecialPropertyAssignmentKind["ExportsProperty"] = 1] = "ExportsProperty";
+        /// module.exports = expr
+        SpecialPropertyAssignmentKind[SpecialPropertyAssignmentKind["ModuleExports"] = 2] = "ModuleExports";
+        /// className.prototype.name = expr
+        SpecialPropertyAssignmentKind[SpecialPropertyAssignmentKind["PrototypeProperty"] = 3] = "PrototypeProperty";
+        /// this.name = expr
+        SpecialPropertyAssignmentKind[SpecialPropertyAssignmentKind["ThisProperty"] = 4] = "ThisProperty";
+        // F.name = expr
+        SpecialPropertyAssignmentKind[SpecialPropertyAssignmentKind["Property"] = 5] = "Property";
+        // F.prototype = { ... }
+        SpecialPropertyAssignmentKind[SpecialPropertyAssignmentKind["Prototype"] = 6] = "Prototype";
+    })(SpecialPropertyAssignmentKind = ts.SpecialPropertyAssignmentKind || (ts.SpecialPropertyAssignmentKind = {}));
+    var DiagnosticCategory;
+    (function (DiagnosticCategory) {
+        DiagnosticCategory[DiagnosticCategory["Warning"] = 0] = "Warning";
+        DiagnosticCategory[DiagnosticCategory["Error"] = 1] = "Error";
+        DiagnosticCategory[DiagnosticCategory["Suggestion"] = 2] = "Suggestion";
+        DiagnosticCategory[DiagnosticCategory["Message"] = 3] = "Message";
+    })(DiagnosticCategory = ts.DiagnosticCategory || (ts.DiagnosticCategory = {}));
+    /* @internal */
+    function diagnosticCategoryName(d, lowerCase) {
+        if (lowerCase === void 0) { lowerCase = true; }
+        var name = DiagnosticCategory[d.category];
+        return lowerCase ? name.toLowerCase() : name;
+    }
+    ts.diagnosticCategoryName = diagnosticCategoryName;
+    var ModuleResolutionKind;
+    (function (ModuleResolutionKind) {
+        ModuleResolutionKind[ModuleResolutionKind["Classic"] = 1] = "Classic";
+        ModuleResolutionKind[ModuleResolutionKind["NodeJs"] = 2] = "NodeJs";
+    })(ModuleResolutionKind = ts.ModuleResolutionKind || (ts.ModuleResolutionKind = {}));
+    var ModuleKind;
+    (function (ModuleKind) {
+        ModuleKind[ModuleKind["None"] = 0] = "None";
+        ModuleKind[ModuleKind["CommonJS"] = 1] = "CommonJS";
+        ModuleKind[ModuleKind["AMD"] = 2] = "AMD";
+        ModuleKind[ModuleKind["UMD"] = 3] = "UMD";
+        ModuleKind[ModuleKind["System"] = 4] = "System";
+        ModuleKind[ModuleKind["ES2015"] = 5] = "ES2015";
+        ModuleKind[ModuleKind["ESNext"] = 6] = "ESNext";
+    })(ModuleKind = ts.ModuleKind || (ts.ModuleKind = {}));
+    var JsxEmit;
+    (function (JsxEmit) {
+        JsxEmit[JsxEmit["None"] = 0] = "None";
+        JsxEmit[JsxEmit["Preserve"] = 1] = "Preserve";
+        JsxEmit[JsxEmit["React"] = 2] = "React";
+        JsxEmit[JsxEmit["ReactNative"] = 3] = "ReactNative";
+    })(JsxEmit = ts.JsxEmit || (ts.JsxEmit = {}));
+    var NewLineKind;
+    (function (NewLineKind) {
+        NewLineKind[NewLineKind["CarriageReturnLineFeed"] = 0] = "CarriageReturnLineFeed";
+        NewLineKind[NewLineKind["LineFeed"] = 1] = "LineFeed";
+    })(NewLineKind = ts.NewLineKind || (ts.NewLineKind = {}));
+    var ScriptKind;
+    (function (ScriptKind) {
+        ScriptKind[ScriptKind["Unknown"] = 0] = "Unknown";
+        ScriptKind[ScriptKind["JS"] = 1] = "JS";
+        ScriptKind[ScriptKind["JSX"] = 2] = "JSX";
+        ScriptKind[ScriptKind["TS"] = 3] = "TS";
+        ScriptKind[ScriptKind["TSX"] = 4] = "TSX";
+        ScriptKind[ScriptKind["External"] = 5] = "External";
+        ScriptKind[ScriptKind["JSON"] = 6] = "JSON";
+        /**
+         * Used on extensions that doesn't define the ScriptKind but the content defines it.
+         * Deferred extensions are going to be included in all project contexts.
+         */
+        ScriptKind[ScriptKind["Deferred"] = 7] = "Deferred";
+    })(ScriptKind = ts.ScriptKind || (ts.ScriptKind = {}));
+    var ScriptTarget;
+    (function (ScriptTarget) {
+        ScriptTarget[ScriptTarget["ES3"] = 0] = "ES3";
+        ScriptTarget[ScriptTarget["ES5"] = 1] = "ES5";
+        ScriptTarget[ScriptTarget["ES2015"] = 2] = "ES2015";
+        ScriptTarget[ScriptTarget["ES2016"] = 3] = "ES2016";
+        ScriptTarget[ScriptTarget["ES2017"] = 4] = "ES2017";
+        ScriptTarget[ScriptTarget["ES2018"] = 5] = "ES2018";
+        ScriptTarget[ScriptTarget["ESNext"] = 6] = "ESNext";
+        ScriptTarget[ScriptTarget["JSON"] = 100] = "JSON";
+        ScriptTarget[ScriptTarget["Latest"] = 6] = "Latest";
+    })(ScriptTarget = ts.ScriptTarget || (ts.ScriptTarget = {}));
+    var LanguageVariant;
+    (function (LanguageVariant) {
+        LanguageVariant[LanguageVariant["Standard"] = 0] = "Standard";
+        LanguageVariant[LanguageVariant["JSX"] = 1] = "JSX";
+    })(LanguageVariant = ts.LanguageVariant || (ts.LanguageVariant = {}));
+    var WatchDirectoryFlags;
+    (function (WatchDirectoryFlags) {
+        WatchDirectoryFlags[WatchDirectoryFlags["None"] = 0] = "None";
+        WatchDirectoryFlags[WatchDirectoryFlags["Recursive"] = 1] = "Recursive";
+    })(WatchDirectoryFlags = ts.WatchDirectoryFlags || (ts.WatchDirectoryFlags = {}));
+    /* @internal */
+    var CharacterCodes;
+    (function (CharacterCodes) {
+        CharacterCodes[CharacterCodes["nullCharacter"] = 0] = "nullCharacter";
+        CharacterCodes[CharacterCodes["maxAsciiCharacter"] = 127] = "maxAsciiCharacter";
+        CharacterCodes[CharacterCodes["lineFeed"] = 10] = "lineFeed";
+        CharacterCodes[CharacterCodes["carriageReturn"] = 13] = "carriageReturn";
+        CharacterCodes[CharacterCodes["lineSeparator"] = 8232] = "lineSeparator";
+        CharacterCodes[CharacterCodes["paragraphSeparator"] = 8233] = "paragraphSeparator";
+        CharacterCodes[CharacterCodes["nextLine"] = 133] = "nextLine";
+        // Unicode 3.0 space characters
+        CharacterCodes[CharacterCodes["space"] = 32] = "space";
+        CharacterCodes[CharacterCodes["nonBreakingSpace"] = 160] = "nonBreakingSpace";
+        CharacterCodes[CharacterCodes["enQuad"] = 8192] = "enQuad";
+        CharacterCodes[CharacterCodes["emQuad"] = 8193] = "emQuad";
+        CharacterCodes[CharacterCodes["enSpace"] = 8194] = "enSpace";
+        CharacterCodes[CharacterCodes["emSpace"] = 8195] = "emSpace";
+        CharacterCodes[CharacterCodes["threePerEmSpace"] = 8196] = "threePerEmSpace";
+        CharacterCodes[CharacterCodes["fourPerEmSpace"] = 8197] = "fourPerEmSpace";
+        CharacterCodes[CharacterCodes["sixPerEmSpace"] = 8198] = "sixPerEmSpace";
+        CharacterCodes[CharacterCodes["figureSpace"] = 8199] = "figureSpace";
+        CharacterCodes[CharacterCodes["punctuationSpace"] = 8200] = "punctuationSpace";
+        CharacterCodes[CharacterCodes["thinSpace"] = 8201] = "thinSpace";
+        CharacterCodes[CharacterCodes["hairSpace"] = 8202] = "hairSpace";
+        CharacterCodes[CharacterCodes["zeroWidthSpace"] = 8203] = "zeroWidthSpace";
+        CharacterCodes[CharacterCodes["narrowNoBreakSpace"] = 8239] = "narrowNoBreakSpace";
+        CharacterCodes[CharacterCodes["ideographicSpace"] = 12288] = "ideographicSpace";
+        CharacterCodes[CharacterCodes["mathematicalSpace"] = 8287] = "mathematicalSpace";
+        CharacterCodes[CharacterCodes["ogham"] = 5760] = "ogham";
+        CharacterCodes[CharacterCodes["_"] = 95] = "_";
+        CharacterCodes[CharacterCodes["$"] = 36] = "$";
+        CharacterCodes[CharacterCodes["_0"] = 48] = "_0";
+        CharacterCodes[CharacterCodes["_1"] = 49] = "_1";
+        CharacterCodes[CharacterCodes["_2"] = 50] = "_2";
+        CharacterCodes[CharacterCodes["_3"] = 51] = "_3";
+        CharacterCodes[CharacterCodes["_4"] = 52] = "_4";
+        CharacterCodes[CharacterCodes["_5"] = 53] = "_5";
+        CharacterCodes[CharacterCodes["_6"] = 54] = "_6";
+        CharacterCodes[CharacterCodes["_7"] = 55] = "_7";
+        CharacterCodes[CharacterCodes["_8"] = 56] = "_8";
+        CharacterCodes[CharacterCodes["_9"] = 57] = "_9";
+        CharacterCodes[CharacterCodes["a"] = 97] = "a";
+        CharacterCodes[CharacterCodes["b"] = 98] = "b";
+        CharacterCodes[CharacterCodes["c"] = 99] = "c";
+        CharacterCodes[CharacterCodes["d"] = 100] = "d";
+        CharacterCodes[CharacterCodes["e"] = 101] = "e";
+        CharacterCodes[CharacterCodes["f"] = 102] = "f";
+        CharacterCodes[CharacterCodes["g"] = 103] = "g";
+        CharacterCodes[CharacterCodes["h"] = 104] = "h";
+        CharacterCodes[CharacterCodes["i"] = 105] = "i";
+        CharacterCodes[CharacterCodes["j"] = 106] = "j";
+        CharacterCodes[CharacterCodes["k"] = 107] = "k";
+        CharacterCodes[CharacterCodes["l"] = 108] = "l";
+        CharacterCodes[CharacterCodes["m"] = 109] = "m";
+        CharacterCodes[CharacterCodes["n"] = 110] = "n";
+        CharacterCodes[CharacterCodes["o"] = 111] = "o";
+        CharacterCodes[CharacterCodes["p"] = 112] = "p";
+        CharacterCodes[CharacterCodes["q"] = 113] = "q";
+        CharacterCodes[CharacterCodes["r"] = 114] = "r";
+        CharacterCodes[CharacterCodes["s"] = 115] = "s";
+        CharacterCodes[CharacterCodes["t"] = 116] = "t";
+        CharacterCodes[CharacterCodes["u"] = 117] = "u";
+        CharacterCodes[CharacterCodes["v"] = 118] = "v";
+        CharacterCodes[CharacterCodes["w"] = 119] = "w";
+        CharacterCodes[CharacterCodes["x"] = 120] = "x";
+        CharacterCodes[CharacterCodes["y"] = 121] = "y";
+        CharacterCodes[CharacterCodes["z"] = 122] = "z";
+        CharacterCodes[CharacterCodes["A"] = 65] = "A";
+        CharacterCodes[CharacterCodes["B"] = 66] = "B";
+        CharacterCodes[CharacterCodes["C"] = 67] = "C";
+        CharacterCodes[CharacterCodes["D"] = 68] = "D";
+        CharacterCodes[CharacterCodes["E"] = 69] = "E";
+        CharacterCodes[CharacterCodes["F"] = 70] = "F";
+        CharacterCodes[CharacterCodes["G"] = 71] = "G";
+        CharacterCodes[CharacterCodes["H"] = 72] = "H";
+        CharacterCodes[CharacterCodes["I"] = 73] = "I";
+        CharacterCodes[CharacterCodes["J"] = 74] = "J";
+        CharacterCodes[CharacterCodes["K"] = 75] = "K";
+        CharacterCodes[CharacterCodes["L"] = 76] = "L";
+        CharacterCodes[CharacterCodes["M"] = 77] = "M";
+        CharacterCodes[CharacterCodes["N"] = 78] = "N";
+        CharacterCodes[CharacterCodes["O"] = 79] = "O";
+        CharacterCodes[CharacterCodes["P"] = 80] = "P";
+        CharacterCodes[CharacterCodes["Q"] = 81] = "Q";
+        CharacterCodes[CharacterCodes["R"] = 82] = "R";
+        CharacterCodes[CharacterCodes["S"] = 83] = "S";
+        CharacterCodes[CharacterCodes["T"] = 84] = "T";
+        CharacterCodes[CharacterCodes["U"] = 85] = "U";
+        CharacterCodes[CharacterCodes["V"] = 86] = "V";
+        CharacterCodes[CharacterCodes["W"] = 87] = "W";
+        CharacterCodes[CharacterCodes["X"] = 88] = "X";
+        CharacterCodes[CharacterCodes["Y"] = 89] = "Y";
+        CharacterCodes[CharacterCodes["Z"] = 90] = "Z";
+        CharacterCodes[CharacterCodes["ampersand"] = 38] = "ampersand";
+        CharacterCodes[CharacterCodes["asterisk"] = 42] = "asterisk";
+        CharacterCodes[CharacterCodes["at"] = 64] = "at";
+        CharacterCodes[CharacterCodes["backslash"] = 92] = "backslash";
+        CharacterCodes[CharacterCodes["backtick"] = 96] = "backtick";
+        CharacterCodes[CharacterCodes["bar"] = 124] = "bar";
+        CharacterCodes[CharacterCodes["caret"] = 94] = "caret";
+        CharacterCodes[CharacterCodes["closeBrace"] = 125] = "closeBrace";
+        CharacterCodes[CharacterCodes["closeBracket"] = 93] = "closeBracket";
+        CharacterCodes[CharacterCodes["closeParen"] = 41] = "closeParen";
+        CharacterCodes[CharacterCodes["colon"] = 58] = "colon";
+        CharacterCodes[CharacterCodes["comma"] = 44] = "comma";
+        CharacterCodes[CharacterCodes["dot"] = 46] = "dot";
+        CharacterCodes[CharacterCodes["doubleQuote"] = 34] = "doubleQuote";
+        CharacterCodes[CharacterCodes["equals"] = 61] = "equals";
+        CharacterCodes[CharacterCodes["exclamation"] = 33] = "exclamation";
+        CharacterCodes[CharacterCodes["greaterThan"] = 62] = "greaterThan";
+        CharacterCodes[CharacterCodes["hash"] = 35] = "hash";
+        CharacterCodes[CharacterCodes["lessThan"] = 60] = "lessThan";
+        CharacterCodes[CharacterCodes["minus"] = 45] = "minus";
+        CharacterCodes[CharacterCodes["openBrace"] = 123] = "openBrace";
+        CharacterCodes[CharacterCodes["openBracket"] = 91] = "openBracket";
+        CharacterCodes[CharacterCodes["openParen"] = 40] = "openParen";
+        CharacterCodes[CharacterCodes["percent"] = 37] = "percent";
+        CharacterCodes[CharacterCodes["plus"] = 43] = "plus";
+        CharacterCodes[CharacterCodes["question"] = 63] = "question";
+        CharacterCodes[CharacterCodes["semicolon"] = 59] = "semicolon";
+        CharacterCodes[CharacterCodes["singleQuote"] = 39] = "singleQuote";
+        CharacterCodes[CharacterCodes["slash"] = 47] = "slash";
+        CharacterCodes[CharacterCodes["tilde"] = 126] = "tilde";
+        CharacterCodes[CharacterCodes["backspace"] = 8] = "backspace";
+        CharacterCodes[CharacterCodes["formFeed"] = 12] = "formFeed";
+        CharacterCodes[CharacterCodes["byteOrderMark"] = 65279] = "byteOrderMark";
+        CharacterCodes[CharacterCodes["tab"] = 9] = "tab";
+        CharacterCodes[CharacterCodes["verticalTab"] = 11] = "verticalTab";
+    })(CharacterCodes = ts.CharacterCodes || (ts.CharacterCodes = {}));
+    var Extension;
+    (function (Extension) {
+        Extension["Ts"] = ".ts";
+        Extension["Tsx"] = ".tsx";
+        Extension["Dts"] = ".d.ts";
+        Extension["Js"] = ".js";
+        Extension["Jsx"] = ".jsx";
+        Extension["Json"] = ".json";
+    })(Extension = ts.Extension || (ts.Extension = {}));
+    /* @internal */
+    var TransformFlags;
+    (function (TransformFlags) {
+        TransformFlags[TransformFlags["None"] = 0] = "None";
+        // Facts
+        // - Flags used to indicate that a node or subtree contains syntax that requires transformation.
+        TransformFlags[TransformFlags["TypeScript"] = 1] = "TypeScript";
+        TransformFlags[TransformFlags["ContainsTypeScript"] = 2] = "ContainsTypeScript";
+        TransformFlags[TransformFlags["ContainsJsx"] = 4] = "ContainsJsx";
+        TransformFlags[TransformFlags["ContainsESNext"] = 8] = "ContainsESNext";
+        TransformFlags[TransformFlags["ContainsES2017"] = 16] = "ContainsES2017";
+        TransformFlags[TransformFlags["ContainsES2016"] = 32] = "ContainsES2016";
+        TransformFlags[TransformFlags["ES2015"] = 64] = "ES2015";
+        TransformFlags[TransformFlags["ContainsES2015"] = 128] = "ContainsES2015";
+        TransformFlags[TransformFlags["Generator"] = 256] = "Generator";
+        TransformFlags[TransformFlags["ContainsGenerator"] = 512] = "ContainsGenerator";
+        TransformFlags[TransformFlags["DestructuringAssignment"] = 1024] = "DestructuringAssignment";
+        TransformFlags[TransformFlags["ContainsDestructuringAssignment"] = 2048] = "ContainsDestructuringAssignment";
+        // Markers
+        // - Flags used to indicate that a subtree contains a specific transformation.
+        TransformFlags[TransformFlags["ContainsDecorators"] = 4096] = "ContainsDecorators";
+        TransformFlags[TransformFlags["ContainsPropertyInitializer"] = 8192] = "ContainsPropertyInitializer";
+        TransformFlags[TransformFlags["ContainsLexicalThis"] = 16384] = "ContainsLexicalThis";
+        TransformFlags[TransformFlags["ContainsCapturedLexicalThis"] = 32768] = "ContainsCapturedLexicalThis";
+        TransformFlags[TransformFlags["ContainsLexicalThisInComputedPropertyName"] = 65536] = "ContainsLexicalThisInComputedPropertyName";
+        TransformFlags[TransformFlags["ContainsDefaultValueAssignments"] = 131072] = "ContainsDefaultValueAssignments";
+        TransformFlags[TransformFlags["ContainsParameterPropertyAssignments"] = 262144] = "ContainsParameterPropertyAssignments";
+        TransformFlags[TransformFlags["ContainsSpread"] = 524288] = "ContainsSpread";
+        TransformFlags[TransformFlags["ContainsObjectSpread"] = 1048576] = "ContainsObjectSpread";
+        TransformFlags[TransformFlags["ContainsRest"] = 524288] = "ContainsRest";
+        TransformFlags[TransformFlags["ContainsObjectRest"] = 1048576] = "ContainsObjectRest";
+        TransformFlags[TransformFlags["ContainsComputedPropertyName"] = 2097152] = "ContainsComputedPropertyName";
+        TransformFlags[TransformFlags["ContainsBlockScopedBinding"] = 4194304] = "ContainsBlockScopedBinding";
+        TransformFlags[TransformFlags["ContainsBindingPattern"] = 8388608] = "ContainsBindingPattern";
+        TransformFlags[TransformFlags["ContainsYield"] = 16777216] = "ContainsYield";
+        TransformFlags[TransformFlags["ContainsHoistedDeclarationOrCompletion"] = 33554432] = "ContainsHoistedDeclarationOrCompletion";
+        TransformFlags[TransformFlags["ContainsDynamicImport"] = 67108864] = "ContainsDynamicImport";
+        TransformFlags[TransformFlags["Super"] = 134217728] = "Super";
+        TransformFlags[TransformFlags["ContainsSuper"] = 268435456] = "ContainsSuper";
+        // Please leave this as 1 << 29.
+        // It is the maximum bit we can set before we outgrow the size of a v8 small integer (SMI) on an x86 system.
+        // It is a good reminder of how much room we have left
+        TransformFlags[TransformFlags["HasComputedFlags"] = 536870912] = "HasComputedFlags";
+        // Assertions
+        // - Bitmasks that are used to assert facts about the syntax of a node and its subtree.
+        TransformFlags[TransformFlags["AssertTypeScript"] = 3] = "AssertTypeScript";
+        TransformFlags[TransformFlags["AssertJsx"] = 4] = "AssertJsx";
+        TransformFlags[TransformFlags["AssertESNext"] = 8] = "AssertESNext";
+        TransformFlags[TransformFlags["AssertES2017"] = 16] = "AssertES2017";
+        TransformFlags[TransformFlags["AssertES2016"] = 32] = "AssertES2016";
+        TransformFlags[TransformFlags["AssertES2015"] = 192] = "AssertES2015";
+        TransformFlags[TransformFlags["AssertGenerator"] = 768] = "AssertGenerator";
+        TransformFlags[TransformFlags["AssertDestructuringAssignment"] = 3072] = "AssertDestructuringAssignment";
+        // Scope Exclusions
+        // - Bitmasks that exclude flags from propagating out of a specific context
+        //   into the subtree flags of their container.
+        TransformFlags[TransformFlags["OuterExpressionExcludes"] = 536872257] = "OuterExpressionExcludes";
+        TransformFlags[TransformFlags["PropertyAccessExcludes"] = 671089985] = "PropertyAccessExcludes";
+        TransformFlags[TransformFlags["NodeExcludes"] = 939525441] = "NodeExcludes";
+        TransformFlags[TransformFlags["ArrowFunctionExcludes"] = 1003902273] = "ArrowFunctionExcludes";
+        TransformFlags[TransformFlags["FunctionExcludes"] = 1003935041] = "FunctionExcludes";
+        TransformFlags[TransformFlags["ConstructorExcludes"] = 1003668801] = "ConstructorExcludes";
+        TransformFlags[TransformFlags["MethodOrAccessorExcludes"] = 1003668801] = "MethodOrAccessorExcludes";
+        TransformFlags[TransformFlags["ClassExcludes"] = 942011713] = "ClassExcludes";
+        TransformFlags[TransformFlags["ModuleExcludes"] = 977327425] = "ModuleExcludes";
+        TransformFlags[TransformFlags["TypeExcludes"] = -3] = "TypeExcludes";
+        TransformFlags[TransformFlags["ObjectLiteralExcludes"] = 942740801] = "ObjectLiteralExcludes";
+        TransformFlags[TransformFlags["ArrayLiteralOrCallOrNewExcludes"] = 940049729] = "ArrayLiteralOrCallOrNewExcludes";
+        TransformFlags[TransformFlags["VariableDeclarationListExcludes"] = 948962625] = "VariableDeclarationListExcludes";
+        TransformFlags[TransformFlags["ParameterExcludes"] = 939525441] = "ParameterExcludes";
+        TransformFlags[TransformFlags["CatchClauseExcludes"] = 940574017] = "CatchClauseExcludes";
+        TransformFlags[TransformFlags["BindingPatternExcludes"] = 940049729] = "BindingPatternExcludes";
+        // Masks
+        // - Additional bitmasks
+        TransformFlags[TransformFlags["TypeScriptClassSyntaxMask"] = 274432] = "TypeScriptClassSyntaxMask";
+        TransformFlags[TransformFlags["ES2015FunctionSyntaxMask"] = 163840] = "ES2015FunctionSyntaxMask";
+    })(TransformFlags = ts.TransformFlags || (ts.TransformFlags = {}));
+    var EmitFlags;
+    (function (EmitFlags) {
+        EmitFlags[EmitFlags["None"] = 0] = "None";
+        EmitFlags[EmitFlags["SingleLine"] = 1] = "SingleLine";
+        EmitFlags[EmitFlags["AdviseOnEmitNode"] = 2] = "AdviseOnEmitNode";
+        EmitFlags[EmitFlags["NoSubstitution"] = 4] = "NoSubstitution";
+        EmitFlags[EmitFlags["CapturesThis"] = 8] = "CapturesThis";
+        EmitFlags[EmitFlags["NoLeadingSourceMap"] = 16] = "NoLeadingSourceMap";
+        EmitFlags[EmitFlags["NoTrailingSourceMap"] = 32] = "NoTrailingSourceMap";
+        EmitFlags[EmitFlags["NoSourceMap"] = 48] = "NoSourceMap";
+        EmitFlags[EmitFlags["NoNestedSourceMaps"] = 64] = "NoNestedSourceMaps";
+        EmitFlags[EmitFlags["NoTokenLeadingSourceMaps"] = 128] = "NoTokenLeadingSourceMaps";
+        EmitFlags[EmitFlags["NoTokenTrailingSourceMaps"] = 256] = "NoTokenTrailingSourceMaps";
+        EmitFlags[EmitFlags["NoTokenSourceMaps"] = 384] = "NoTokenSourceMaps";
+        EmitFlags[EmitFlags["NoLeadingComments"] = 512] = "NoLeadingComments";
+        EmitFlags[EmitFlags["NoTrailingComments"] = 1024] = "NoTrailingComments";
+        EmitFlags[EmitFlags["NoComments"] = 1536] = "NoComments";
+        EmitFlags[EmitFlags["NoNestedComments"] = 2048] = "NoNestedComments";
+        EmitFlags[EmitFlags["HelperName"] = 4096] = "HelperName";
+        EmitFlags[EmitFlags["ExportName"] = 8192] = "ExportName";
+        EmitFlags[EmitFlags["LocalName"] = 16384] = "LocalName";
+        EmitFlags[EmitFlags["InternalName"] = 32768] = "InternalName";
+        EmitFlags[EmitFlags["Indented"] = 65536] = "Indented";
+        EmitFlags[EmitFlags["NoIndentation"] = 131072] = "NoIndentation";
+        EmitFlags[EmitFlags["AsyncFunctionBody"] = 262144] = "AsyncFunctionBody";
+        EmitFlags[EmitFlags["ReuseTempVariableScope"] = 524288] = "ReuseTempVariableScope";
+        EmitFlags[EmitFlags["CustomPrologue"] = 1048576] = "CustomPrologue";
+        EmitFlags[EmitFlags["NoHoisting"] = 2097152] = "NoHoisting";
+        EmitFlags[EmitFlags["HasEndOfDeclarationMarker"] = 4194304] = "HasEndOfDeclarationMarker";
+        EmitFlags[EmitFlags["Iterator"] = 8388608] = "Iterator";
+        EmitFlags[EmitFlags["NoAsciiEscaping"] = 16777216] = "NoAsciiEscaping";
+        /*@internal*/ EmitFlags[EmitFlags["TypeScriptClassWrapper"] = 33554432] = "TypeScriptClassWrapper";
+        /*@internal*/ EmitFlags[EmitFlags["NeverApplyImportHelper"] = 67108864] = "NeverApplyImportHelper";
+    })(EmitFlags = ts.EmitFlags || (ts.EmitFlags = {}));
+    /**
+     * Used by the checker, this enum keeps track of external emit helpers that should be type
+     * checked.
+     */
+    /* @internal */
+    var ExternalEmitHelpers;
+    (function (ExternalEmitHelpers) {
+        ExternalEmitHelpers[ExternalEmitHelpers["Extends"] = 1] = "Extends";
+        ExternalEmitHelpers[ExternalEmitHelpers["Assign"] = 2] = "Assign";
+        ExternalEmitHelpers[ExternalEmitHelpers["Rest"] = 4] = "Rest";
+        ExternalEmitHelpers[ExternalEmitHelpers["Decorate"] = 8] = "Decorate";
+        ExternalEmitHelpers[ExternalEmitHelpers["Metadata"] = 16] = "Metadata";
+        ExternalEmitHelpers[ExternalEmitHelpers["Param"] = 32] = "Param";
+        ExternalEmitHelpers[ExternalEmitHelpers["Awaiter"] = 64] = "Awaiter";
+        ExternalEmitHelpers[ExternalEmitHelpers["Generator"] = 128] = "Generator";
+        ExternalEmitHelpers[ExternalEmitHelpers["Values"] = 256] = "Values";
+        ExternalEmitHelpers[ExternalEmitHelpers["Read"] = 512] = "Read";
+        ExternalEmitHelpers[ExternalEmitHelpers["Spread"] = 1024] = "Spread";
+        ExternalEmitHelpers[ExternalEmitHelpers["Await"] = 2048] = "Await";
+        ExternalEmitHelpers[ExternalEmitHelpers["AsyncGenerator"] = 4096] = "AsyncGenerator";
+        ExternalEmitHelpers[ExternalEmitHelpers["AsyncDelegator"] = 8192] = "AsyncDelegator";
+        ExternalEmitHelpers[ExternalEmitHelpers["AsyncValues"] = 16384] = "AsyncValues";
+        ExternalEmitHelpers[ExternalEmitHelpers["ExportStar"] = 32768] = "ExportStar";
+        ExternalEmitHelpers[ExternalEmitHelpers["MakeTemplateObject"] = 65536] = "MakeTemplateObject";
+        ExternalEmitHelpers[ExternalEmitHelpers["FirstEmitHelper"] = 1] = "FirstEmitHelper";
+        ExternalEmitHelpers[ExternalEmitHelpers["LastEmitHelper"] = 65536] = "LastEmitHelper";
+        // Helpers included by ES2015 for..of
+        ExternalEmitHelpers[ExternalEmitHelpers["ForOfIncludes"] = 256] = "ForOfIncludes";
+        // Helpers included by ES2017 for..await..of
+        ExternalEmitHelpers[ExternalEmitHelpers["ForAwaitOfIncludes"] = 16384] = "ForAwaitOfIncludes";
+        // Helpers included by ES2017 async generators
+        ExternalEmitHelpers[ExternalEmitHelpers["AsyncGeneratorIncludes"] = 6144] = "AsyncGeneratorIncludes";
+        // Helpers included by yield* in ES2017 async generators
+        ExternalEmitHelpers[ExternalEmitHelpers["AsyncDelegatorIncludes"] = 26624] = "AsyncDelegatorIncludes";
+        // Helpers included by ES2015 spread
+        ExternalEmitHelpers[ExternalEmitHelpers["SpreadIncludes"] = 1536] = "SpreadIncludes";
+    })(ExternalEmitHelpers = ts.ExternalEmitHelpers || (ts.ExternalEmitHelpers = {}));
+    var EmitHint;
+    (function (EmitHint) {
+        EmitHint[EmitHint["SourceFile"] = 0] = "SourceFile";
+        EmitHint[EmitHint["Expression"] = 1] = "Expression";
+        EmitHint[EmitHint["IdentifierName"] = 2] = "IdentifierName";
+        EmitHint[EmitHint["MappedTypeParameter"] = 3] = "MappedTypeParameter";
+        EmitHint[EmitHint["Unspecified"] = 4] = "Unspecified";
+    })(EmitHint = ts.EmitHint || (ts.EmitHint = {}));
+    var ListFormat;
+    (function (ListFormat) {
+        ListFormat[ListFormat["None"] = 0] = "None";
+        // Line separators
+        ListFormat[ListFormat["SingleLine"] = 0] = "SingleLine";
+        ListFormat[ListFormat["MultiLine"] = 1] = "MultiLine";
+        ListFormat[ListFormat["PreserveLines"] = 2] = "PreserveLines";
+        ListFormat[ListFormat["LinesMask"] = 3] = "LinesMask";
+        // Delimiters
+        ListFormat[ListFormat["NotDelimited"] = 0] = "NotDelimited";
+        ListFormat[ListFormat["BarDelimited"] = 4] = "BarDelimited";
+        ListFormat[ListFormat["AmpersandDelimited"] = 8] = "AmpersandDelimited";
+        ListFormat[ListFormat["CommaDelimited"] = 16] = "CommaDelimited";
+        ListFormat[ListFormat["DelimitersMask"] = 28] = "DelimitersMask";
+        ListFormat[ListFormat["AllowTrailingComma"] = 32] = "AllowTrailingComma";
+        // Whitespace
+        ListFormat[ListFormat["Indented"] = 64] = "Indented";
+        ListFormat[ListFormat["SpaceBetweenBraces"] = 128] = "SpaceBetweenBraces";
+        ListFormat[ListFormat["SpaceBetweenSiblings"] = 256] = "SpaceBetweenSiblings";
+        // Brackets/Braces
+        ListFormat[ListFormat["Braces"] = 512] = "Braces";
+        ListFormat[ListFormat["Parenthesis"] = 1024] = "Parenthesis";
+        ListFormat[ListFormat["AngleBrackets"] = 2048] = "AngleBrackets";
+        ListFormat[ListFormat["SquareBrackets"] = 4096] = "SquareBrackets";
+        ListFormat[ListFormat["BracketsMask"] = 7680] = "BracketsMask";
+        ListFormat[ListFormat["OptionalIfUndefined"] = 8192] = "OptionalIfUndefined";
+        ListFormat[ListFormat["OptionalIfEmpty"] = 16384] = "OptionalIfEmpty";
+        ListFormat[ListFormat["Optional"] = 24576] = "Optional";
+        // Other
+        ListFormat[ListFormat["PreferNewLine"] = 32768] = "PreferNewLine";
+        ListFormat[ListFormat["NoTrailingNewLine"] = 65536] = "NoTrailingNewLine";
+        ListFormat[ListFormat["NoInterveningComments"] = 131072] = "NoInterveningComments";
+        ListFormat[ListFormat["NoSpaceIfEmpty"] = 262144] = "NoSpaceIfEmpty";
+        ListFormat[ListFormat["SingleElement"] = 524288] = "SingleElement";
+        // Precomputed Formats
+        ListFormat[ListFormat["Modifiers"] = 131328] = "Modifiers";
+        ListFormat[ListFormat["HeritageClauses"] = 256] = "HeritageClauses";
+        ListFormat[ListFormat["SingleLineTypeLiteralMembers"] = 384] = "SingleLineTypeLiteralMembers";
+        ListFormat[ListFormat["MultiLineTypeLiteralMembers"] = 16449] = "MultiLineTypeLiteralMembers";
+        ListFormat[ListFormat["TupleTypeElements"] = 272] = "TupleTypeElements";
+        ListFormat[ListFormat["UnionTypeConstituents"] = 260] = "UnionTypeConstituents";
+        ListFormat[ListFormat["IntersectionTypeConstituents"] = 264] = "IntersectionTypeConstituents";
+        ListFormat[ListFormat["ObjectBindingPatternElements"] = 262576] = "ObjectBindingPatternElements";
+        ListFormat[ListFormat["ArrayBindingPatternElements"] = 262448] = "ArrayBindingPatternElements";
+        ListFormat[ListFormat["ObjectLiteralExpressionProperties"] = 263122] = "ObjectLiteralExpressionProperties";
+        ListFormat[ListFormat["ArrayLiteralExpressionElements"] = 4466] = "ArrayLiteralExpressionElements";
+        ListFormat[ListFormat["CommaListElements"] = 272] = "CommaListElements";
+        ListFormat[ListFormat["CallExpressionArguments"] = 1296] = "CallExpressionArguments";
+        ListFormat[ListFormat["NewExpressionArguments"] = 9488] = "NewExpressionArguments";
+        ListFormat[ListFormat["TemplateExpressionSpans"] = 131072] = "TemplateExpressionSpans";
+        ListFormat[ListFormat["SingleLineBlockStatements"] = 384] = "SingleLineBlockStatements";
+        ListFormat[ListFormat["MultiLineBlockStatements"] = 65] = "MultiLineBlockStatements";
+        ListFormat[ListFormat["VariableDeclarationList"] = 272] = "VariableDeclarationList";
+        ListFormat[ListFormat["SingleLineFunctionBodyStatements"] = 384] = "SingleLineFunctionBodyStatements";
+        ListFormat[ListFormat["MultiLineFunctionBodyStatements"] = 1] = "MultiLineFunctionBodyStatements";
+        ListFormat[ListFormat["ClassHeritageClauses"] = 0] = "ClassHeritageClauses";
+        ListFormat[ListFormat["ClassMembers"] = 65] = "ClassMembers";
+        ListFormat[ListFormat["InterfaceMembers"] = 65] = "InterfaceMembers";
+        ListFormat[ListFormat["EnumMembers"] = 81] = "EnumMembers";
+        ListFormat[ListFormat["CaseBlockClauses"] = 65] = "CaseBlockClauses";
+        ListFormat[ListFormat["NamedImportsOrExportsElements"] = 262576] = "NamedImportsOrExportsElements";
+        ListFormat[ListFormat["JsxElementOrFragmentChildren"] = 131072] = "JsxElementOrFragmentChildren";
+        ListFormat[ListFormat["JsxElementAttributes"] = 131328] = "JsxElementAttributes";
+        ListFormat[ListFormat["CaseOrDefaultClauseStatements"] = 81985] = "CaseOrDefaultClauseStatements";
+        ListFormat[ListFormat["HeritageClauseTypes"] = 272] = "HeritageClauseTypes";
+        ListFormat[ListFormat["SourceFileStatements"] = 65537] = "SourceFileStatements";
+        ListFormat[ListFormat["Decorators"] = 24577] = "Decorators";
+        ListFormat[ListFormat["TypeArguments"] = 26896] = "TypeArguments";
+        ListFormat[ListFormat["TypeParameters"] = 26896] = "TypeParameters";
+        ListFormat[ListFormat["Parameters"] = 1296] = "Parameters";
+        ListFormat[ListFormat["IndexSignatureParameters"] = 4432] = "IndexSignatureParameters";
+    })(ListFormat = ts.ListFormat || (ts.ListFormat = {}));
+    /* @internal */
+    var PragmaKindFlags;
+    (function (PragmaKindFlags) {
+        PragmaKindFlags[PragmaKindFlags["None"] = 0] = "None";
+        /**
+         * Triple slash comment of the form
+         * /// <pragma-name argname="value" />
+         */
+        PragmaKindFlags[PragmaKindFlags["TripleSlashXML"] = 1] = "TripleSlashXML";
+        /**
+         * Single line comment of the form
+         * // @pragma-name argval1 argval2
+         * or
+         * /// @pragma-name argval1 argval2
+         */
+        PragmaKindFlags[PragmaKindFlags["SingleLine"] = 2] = "SingleLine";
+        /**
+         * Multiline non-jsdoc pragma of the form
+         * /* @pragma-name argval1 argval2 * /
+         */
+        PragmaKindFlags[PragmaKindFlags["MultiLine"] = 4] = "MultiLine";
+        PragmaKindFlags[PragmaKindFlags["All"] = 7] = "All";
+        PragmaKindFlags[PragmaKindFlags["Default"] = 7] = "Default";
+    })(PragmaKindFlags = ts.PragmaKindFlags || (ts.PragmaKindFlags = {}));
+    /**
+     * This function only exists to cause exact types to be inferred for all the literals within `commentPragmas`
+     */
+    /* @internal */
+    function _contextuallyTypePragmas(args) {
+        return args;
+    }
+    // While not strictly a type, this is here because `PragmaMap` needs to be here to be used with `SourceFile`, and we don't
+    //  fancy effectively defining it twice, once in value-space and once in type-space
+    /* @internal */
+    ts.commentPragmas = _contextuallyTypePragmas({
+        "reference": {
+            args: [
+                { name: "types", optional: true, captureSpan: true },
+                { name: "lib", optional: true, captureSpan: true },
+                { name: "path", optional: true, captureSpan: true },
+                { name: "no-default-lib", optional: true }
+            ],
+            kind: 1 /* TripleSlashXML */
+        },
+        "amd-dependency": {
+            args: [{ name: "path" }, { name: "name", optional: true }],
+            kind: 1 /* TripleSlashXML */
+        },
+        "amd-module": {
+            args: [{ name: "name" }],
+            kind: 1 /* TripleSlashXML */
+        },
+        "ts-check": {
+            kind: 2 /* SingleLine */
+        },
+        "ts-nocheck": {
+            kind: 2 /* SingleLine */
+        },
+        "jsx": {
+            args: [{ name: "factory" }],
+            kind: 4 /* MultiLine */
+        },
+    });
+})(ts || (ts = {}));
+var ts;
+(function (ts) {
+    /**
+     * Set a high stack trace limit to provide more information in case of an error.
+     * Called for command-line and server use cases.
+     * Not called if TypeScript is used as a library.
+     */
+    /* @internal */
     function setStackTraceLimit() {
-        if (Error.stackTraceLimit < 100) {
+        if (Error.stackTraceLimit < 100) { // Also tests that we won't set the property if it doesn't exist.
             Error.stackTraceLimit = 100;
         }
     }
@@ -2872,6 +3514,7 @@ var ts;
         FileWatcherEventKind[FileWatcherEventKind["Changed"] = 1] = "Changed";
         FileWatcherEventKind[FileWatcherEventKind["Deleted"] = 2] = "Deleted";
     })(FileWatcherEventKind = ts.FileWatcherEventKind || (ts.FileWatcherEventKind = {}));
+    /* @internal */
     var PollingInterval;
     (function (PollingInterval) {
         PollingInterval[PollingInterval["High"] = 2000] = "High";
@@ -2887,11 +3530,13 @@ var ts;
         return pollingIntervalsForPriority[watchPriority];
     }
     var pollingIntervalsForPriority = getPriorityValues(250);
+    /* @internal */
     function watchFileUsingPriorityPollingInterval(host, fileName, callback, watchPriority) {
         return host.watchFile(fileName, callback, pollingInterval(watchPriority));
     }
     ts.watchFileUsingPriorityPollingInterval = watchFileUsingPriorityPollingInterval;
-    ts.missingFileModifiedTime = new Date(0);
+    /* @internal */
+    ts.missingFileModifiedTime = new Date(0); // Any subsequent modification will occur after this time
     function createPollingIntervalBasedLevels(levels) {
         var _a;
         return _a = {},
@@ -2902,7 +3547,9 @@ var ts;
     }
     var defaultChunkLevels = { Low: 32, Medium: 64, High: 256 };
     var pollingChunkSize = createPollingIntervalBasedLevels(defaultChunkLevels);
+    /* @internal */
     ts.unchangedPollThresholds = createPollingIntervalBasedLevels(defaultChunkLevels);
+    /* @internal */
     function setCustomPollingValues(system) {
         if (!system.getEnvironmentVariable) {
             return;
@@ -2946,6 +3593,7 @@ var ts;
         }
     }
     ts.setCustomPollingValues = setCustomPollingValues;
+    /* @internal */
     function createDynamicPriorityPollingWatchFile(host) {
         var watchedFiles = [];
         var changedFilesInLastPoll = [];
@@ -2965,7 +3613,9 @@ var ts;
             return {
                 close: function () {
                     file.isClosed = true;
+                    // Remove from watchedFiles
                     ts.unorderedRemoveItem(watchedFiles, file);
+                    // Do not update polling interval queue since that will happen as part of polling
                 }
             };
         }
@@ -2978,6 +3628,7 @@ var ts;
         }
         function pollPollingIntervalQueue(queue) {
             queue.pollIndex = pollQueue(queue, queue.pollingInterval, queue.pollIndex, pollingChunkSize[queue.pollingInterval]);
+            // Set the next polling index and timeout
             if (queue.length) {
                 scheduleNextPoll(queue.pollingInterval);
             }
@@ -2987,13 +3638,18 @@ var ts;
             }
         }
         function pollLowPollingIntervalQueue(queue) {
-            pollQueue(changedFilesInLastPoll, PollingInterval.Low, 0, changedFilesInLastPoll.length);
+            // Always poll complete list of changedFilesInLastPoll
+            pollQueue(changedFilesInLastPoll, PollingInterval.Low, /*pollIndex*/ 0, changedFilesInLastPoll.length);
+            // Finally do the actual polling of the queue
             pollPollingIntervalQueue(queue);
+            // Schedule poll if there are files in changedFilesInLastPoll but no files in the actual queue
+            // as pollPollingIntervalQueue wont schedule for next poll
             if (!queue.pollScheduled && changedFilesInLastPoll.length) {
                 scheduleNextPoll(PollingInterval.Low);
             }
         }
         function pollQueue(queue, pollingInterval, pollIndex, chunkSize) {
+            // Max visit would be all elements of the queue
             var needsVisit = queue.length;
             var definedValueCopyToIndex = pollIndex;
             for (var polled = 0; polled < chunkSize && needsVisit > 0; nextPollIndex(), needsVisit--) {
@@ -3008,10 +3664,12 @@ var ts;
                 polled++;
                 var fileChanged = onWatchedFileStat(watchedFile, getModifiedTime(watchedFile.fileName));
                 if (watchedFile.isClosed) {
+                    // Closed watcher as part of callback
                     queue[pollIndex] = undefined;
                 }
                 else if (fileChanged) {
                     watchedFile.unchangedPolls = 0;
+                    // Changed files go to changedFilesInLastPoll queue
                     if (queue !== changedFilesInLastPoll) {
                         queue[pollIndex] = undefined;
                         addChangedFileToLowPollingIntervalQueue(watchedFile);
@@ -3021,6 +3679,7 @@ var ts;
                     watchedFile.unchangedPolls++;
                 }
                 else if (queue === changedFilesInLastPoll) {
+                    // Restart unchangedPollCount for unchanged file and move to low polling interval queue
                     watchedFile.unchangedPolls = 1;
                     queue[pollIndex] = undefined;
                     addToPollingIntervalQueue(watchedFile, PollingInterval.Low);
@@ -3031,6 +3690,7 @@ var ts;
                     addToPollingIntervalQueue(watchedFile, pollingInterval === PollingInterval.Low ? PollingInterval.Medium : PollingInterval.High);
                 }
                 if (queue[pollIndex]) {
+                    // Copy this file to the non hole location
                     if (definedValueCopyToIndex < pollIndex) {
                         queue[definedValueCopyToIndex] = watchedFile;
                         queue[pollIndex] = undefined;
@@ -3038,11 +3698,13 @@ var ts;
                     definedValueCopyToIndex++;
                 }
             }
+            // Return next poll index
             return pollIndex;
             function nextPollIndex() {
                 pollIndex++;
                 if (pollIndex === queue.length) {
                     if (definedValueCopyToIndex < pollIndex) {
+                        // There are holes from nextDefinedValueIndex to end of queue, change queue size
                         queue.length = definedValueCopyToIndex;
                     }
                     pollIndex = 0;
@@ -3081,6 +3743,10 @@ var ts;
         }
     }
     ts.createDynamicPriorityPollingWatchFile = createDynamicPriorityPollingWatchFile;
+    /**
+     * Returns true if file status changed
+     */
+    /*@internal*/
     function onWatchedFileStat(watchedFile, modifiedTime) {
         var oldTime = watchedFile.mtime.getTime();
         var newTime = modifiedTime.getTime();
@@ -3097,11 +3763,22 @@ var ts;
         return false;
     }
     ts.onWatchedFileStat = onWatchedFileStat;
+    /**
+     * Watch the directory recursively using host provided method to watch child directories
+     * that means if this is recursive watcher, watch the children directories as well
+     * (eg on OS that dont support recursive watch using fs.watch use fs.watchFile)
+     */
+    /*@internal*/
     function createRecursiveDirectoryWatcher(host) {
         return createDirectoryWatcher;
+        /**
+         * Create the directory watcher for the dirPath.
+         */
         function createDirectoryWatcher(dirName, callback) {
             var watcher = host.watchDirectory(dirName, function (fileName) {
+                // Call the actual callback
                 callback(fileName);
+                // Iterate through existing children and update the watches if needed
                 updateChildWatches(result, callback);
             });
             var result = {
@@ -3117,21 +3794,33 @@ var ts;
             return result;
         }
         function updateChildWatches(watcher, callback) {
+            // Iterate through existing children and update the watches if needed
             if (watcher) {
                 watcher.childWatches = watchChildDirectories(watcher.dirName, watcher.childWatches, callback);
             }
         }
+        /**
+         * Watch the directories in the parentDir
+         */
         function watchChildDirectories(parentDir, existingChildWatches, callback) {
             var newChildWatches;
             ts.enumerateInsertsAndDeletes(host.directoryExists(parentDir) ? ts.mapDefined(host.getAccessibleSortedChildDirectories(parentDir), function (child) {
                 var childFullName = ts.getNormalizedAbsolutePath(child, parentDir);
-                return host.filePathComparer(childFullName, host.realpath(childFullName)) === 0 ? childFullName : undefined;
+                // Filter our the symbolic link directories since those arent included in recursive watch
+                // which is same behaviour when recursive: true is passed to fs.watch
+                return host.filePathComparer(childFullName, host.realpath(childFullName)) === 0 /* EqualTo */ ? childFullName : undefined;
             }) : ts.emptyArray, existingChildWatches, function (child, childWatcher) { return host.filePathComparer(child, childWatcher.dirName); }, createAndAddChildDirectoryWatcher, ts.closeFileWatcher, addChildDirectoryWatcher);
             return newChildWatches || ts.emptyArray;
+            /**
+             * Create new childDirectoryWatcher and add it to the new ChildDirectoryWatcher list
+             */
             function createAndAddChildDirectoryWatcher(childName) {
                 var result = createDirectoryWatcher(childName, callback);
                 addChildDirectoryWatcher(result);
             }
+            /**
+             * Add child directory watcher to the new ChildDirectoryWatcher list
+             */
             function addChildDirectoryWatcher(childWatcher) {
                 (newChildWatches || (newChildWatches = [])).push(childWatcher);
             }
@@ -3153,12 +3842,17 @@ var ts;
         return parseInt(version.substring(1, dot));
     }
     ts.getNodeMajorVersion = getNodeMajorVersion;
+    // TODO: this is used as if it's certainly defined in many places.
     ts.sys = (function () {
+        // NodeJS detects "\uFEFF" at the start of the string and *replaces* it with the actual
+        // byte order mark from the specified encoding. Using any other byte order mark does
+        // not actually work.
         var byteOrderMarkIndicator = "\uFEFF";
         function getNodeSystem() {
             var _fs = require("fs");
             var _path = require("path");
             var _os = require("os");
+            // crypto can be absent on reduced node installations
             var _crypto;
             try {
                 _crypto = require("crypto");
@@ -3171,6 +3865,11 @@ var ts;
             var isNode4OrLater = nodeVersion >= 4;
             var platform = _os.platform();
             var useCaseSensitiveFileNames = isFileSystemCaseSensitive();
+            var FileSystemEntryKind;
+            (function (FileSystemEntryKind) {
+                FileSystemEntryKind[FileSystemEntryKind["File"] = 0] = "File";
+                FileSystemEntryKind[FileSystemEntryKind["Directory"] = 1] = "Directory";
+            })(FileSystemEntryKind || (FileSystemEntryKind = {}));
             var useNonPollingWatchers = process.env.TSC_NONPOLLING_WATCHER;
             var tscWatchFile = process.env.TSC_WATCHFILE;
             var tscWatchDirectory = process.env.TSC_WATCHDIRECTORY;
@@ -3209,6 +3908,8 @@ var ts;
                 },
                 readDirectory: readDirectory,
                 getModifiedTime: getModifiedTime,
+                setModifiedTime: setModifiedTime,
+                deleteFile: deleteFile,
                 createHash: _crypto ? createMD5HashUsingNativeCrypto : generateDjb2Hash,
                 createSHA256Hash: _crypto ? createSHA256Hash : undefined,
                 getMemoryUsage: function () {
@@ -3224,7 +3925,7 @@ var ts;
                             return stat.size;
                         }
                     }
-                    catch (_a) { }
+                    catch ( /*ignore*/_a) { /*ignore*/ }
                     return 0;
                 },
                 exit: function (exitCode) {
@@ -3237,6 +3938,7 @@ var ts;
                         require("source-map-support").install();
                     }
                     catch (_a) {
+                        // Could not enable source maps.
                     }
                 },
                 setTimeout: setTimeout,
@@ -3262,11 +3964,14 @@ var ts;
             };
             return nodeSystem;
             function isFileSystemCaseSensitive() {
+                // win32\win64 are case insensitive platforms
                 if (platform === "win32" || platform === "win64") {
                     return false;
                 }
+                // If this file exists under a different case, we must be case-insensitve.
                 return !fileExists(swapCase(__filename));
             }
+            /** Convert all lowercase chars to uppercase, and vice-versa */
             function swapCase(s) {
                 return s.replace(/\w/g, function (ch) {
                     var up = ch.toUpperCase();
@@ -3276,22 +3981,30 @@ var ts;
             function getWatchFile() {
                 switch (tscWatchFile) {
                     case "PriorityPollingInterval":
+                        // Use polling interval based on priority when create watch using host.watchFile
                         return fsWatchFile;
                     case "DynamicPriorityPolling":
+                        // Use polling interval but change the interval depending on file changes and their default polling interval
                         return createDynamicPriorityPollingWatchFile({ getModifiedTime: getModifiedTime, setTimeout: setTimeout });
                     case "UseFsEvents":
+                        // Use notifications from FS to watch with falling back to fs.watchFile
                         return watchFileUsingFsWatch;
                     case "UseFsEventsWithFallbackDynamicPolling":
+                        // Use notifications from FS to watch with falling back to dynamic watch file
                         dynamicPollingWatchFile = createDynamicPriorityPollingWatchFile({ getModifiedTime: getModifiedTime, setTimeout: setTimeout });
                         return createWatchFileUsingDynamicWatchFile(dynamicPollingWatchFile);
                     case "UseFsEventsOnParentDirectory":
+                        // Use notifications from FS to watch with falling back to fs.watchFile
                         return createNonPollingWatchFile();
                 }
                 return useNonPollingWatchers ?
                     createNonPollingWatchFile() :
+                    // Default to do not use polling interval as it is before this experiment branch
                     function (fileName, callback) { return fsWatchFile(fileName, callback); };
             }
             function getWatchDirectory() {
+                // Node 4.0 `fs.watch` function supports the "recursive" option on both OSX and Windows
+                // (ref: https://github.com/nodejs/node/pull/2649 and https://github.com/Microsoft/TypeScript/issues/4643)
                 var fsSupportsRecursive = isNode4OrLater && (process.platform === "win32" || process.platform === "darwin");
                 if (fsSupportsRecursive) {
                     return watchDirectoryUsingFsWatch;
@@ -3313,10 +4026,11 @@ var ts;
                         return watchDirectoryRecursively(directoryName, callback);
                     }
                     watchDirectory(directoryName, callback);
-                    return undefined;
+                    return undefined; // TODO: GH#18217
                 };
             }
             function createNonPollingWatchFile() {
+                // One file can have multiple watchers
                 var fileWatcherCallbacks = ts.createMultiMap();
                 var dirWatchers = ts.createMap();
                 var toCanonicalName = ts.createGetCanonicalFileName(useCaseSensitiveFileNames);
@@ -3342,9 +4056,11 @@ var ts;
                 }
                 function createDirectoryWatcher(dirName, dirPath) {
                     var watcher = fsWatchDirectory(dirName, function (_eventName, relativeFileName) {
+                        // When files are deleted from disk, the triggered "rename" event would have a relativefileName of "undefined"
                         var fileName = !ts.isString(relativeFileName)
-                            ? undefined
+                            ? undefined // TODO: GH#18217
                             : ts.getNormalizedAbsolutePath(relativeFileName, dirName);
+                        // Some applications save a working file via rename operations
                         var callbacks = fileWatcherCallbacks.get(toCanonicalName(fileName));
                         if (callbacks) {
                             for (var _i = 0, callbacks_1 = callbacks; _i < callbacks_1.length; _i++) {
@@ -3365,9 +4081,12 @@ var ts;
                     close: function () { return _fs.unwatchFile(fileName, fileChanged); }
                 };
                 function fileChanged(curr, prev) {
+                    // previous event kind check is to ensure we recongnize the file as previously also missing when it is restored or renamed twice (that is it disappears and reappears)
+                    // In such case, prevTime returned is same as prev time of event when file was deleted as per node documentation
                     var isPreviouslyDeleted = +prev.mtime === 0 || eventKind === FileWatcherEventKind.Deleted;
                     if (+curr.mtime === 0) {
                         if (isPreviouslyDeleted) {
+                            // Already deleted file, no need to callback again
                             return;
                         }
                         eventKind = FileWatcherEventKind.Deleted;
@@ -3375,10 +4094,12 @@ var ts;
                     else if (isPreviouslyDeleted) {
                         eventKind = FileWatcherEventKind.Created;
                     }
+                    // If there is no change in modified time, ignore the event
                     else if (+curr.mtime === +prev.mtime) {
                         return;
                     }
                     else {
+                        // File changed
                         eventKind = FileWatcherEventKind.Changed;
                     }
                     callback(fileName, eventKind);
@@ -3393,36 +4114,55 @@ var ts;
                         callback(fileName, fileExists(fileName) ? FileWatcherEventKind.Created : FileWatcherEventKind.Deleted);
                     }
                     else {
+                        // Change
                         callback(fileName, FileWatcherEventKind.Changed);
                     }
                 };
             }
             function createFsWatchCallbackForDirectoryWatcherCallback(directoryName, callback) {
                 return function (eventName, relativeFileName) {
+                    // In watchDirectory we only care about adding and removing files (when event name is
+                    // "rename"); changes made within files are handled by corresponding fileWatchers (when
+                    // event name is "change")
                     if (eventName === "rename") {
+                        // When deleting a file, the passed baseFileName is null
                         callback(!relativeFileName ? directoryName : ts.normalizePath(ts.combinePaths(directoryName, relativeFileName)));
                     }
                 };
             }
             function fsWatch(fileOrDirectory, entryKind, callback, recursive, fallbackPollingWatchFile, pollingInterval) {
                 var options;
+                /** Watcher for the file system entry depending on whether it is missing or present */
                 var watcher = !fileSystemEntryExists(fileOrDirectory, entryKind) ?
                     watchMissingFileSystemEntry() :
                     watchPresentFileSystemEntry();
                 return {
                     close: function () {
+                        // Close the watcher (either existing file system entry watcher or missing file system entry watcher)
                         watcher.close();
                         watcher = undefined;
                     }
                 };
+                /**
+                 * Invoke the callback with rename and update the watcher if not closed
+                 * @param createWatcher
+                 */
                 function invokeCallbackAndUpdateWatcher(createWatcher) {
+                    // Call the callback for current directory
                     callback("rename", "");
+                    // If watcher is not closed, update it
                     if (watcher) {
                         watcher.close();
                         watcher = createWatcher();
                     }
                 }
+                /**
+                 * Watch the file or directory that is currently present
+                 * and when the watched file or directory is deleted, switch to missing file system entry watcher
+                 */
                 function watchPresentFileSystemEntry() {
+                    // Node 4.0 `fs.watch` function supports the "recursive" option on both OSX and Windows
+                    // (ref: https://github.com/nodejs/node/pull/2649 and https://github.com/Microsoft/TypeScript/issues/4643)
                     if (options === undefined) {
                         if (isNode4OrLater && (process.platform === "win32" || process.platform === "darwin")) {
                             options = { persistent: true, recursive: !!recursive };
@@ -3433,32 +4173,47 @@ var ts;
                     }
                     try {
                         var presentWatcher = _fs.watch(fileOrDirectory, options, callback);
+                        // Watch the missing file or directory or error
                         presentWatcher.on("error", function () { return invokeCallbackAndUpdateWatcher(watchMissingFileSystemEntry); });
                         return presentWatcher;
                     }
                     catch (e) {
+                        // Catch the exception and use polling instead
+                        // Eg. on linux the number of watches are limited and one could easily exhaust watches and the exception ENOSPC is thrown when creating watcher at that point
+                        // so instead of throwing error, use fs.watchFile
                         return watchPresentFileSystemEntryWithFsWatchFile();
                     }
                 }
+                /**
+                 * Watch the file or directory using fs.watchFile since fs.watch threw exception
+                 * Eg. on linux the number of watches are limited and one could easily exhaust watches and the exception ENOSPC is thrown when creating watcher at that point
+                 */
                 function watchPresentFileSystemEntryWithFsWatchFile() {
                     return fallbackPollingWatchFile(fileOrDirectory, createFileWatcherCallback(callback), pollingInterval);
                 }
+                /**
+                 * Watch the file or directory that is missing
+                 * and switch to existing file or directory when the missing filesystem entry is created
+                 */
                 function watchMissingFileSystemEntry() {
                     return fallbackPollingWatchFile(fileOrDirectory, function (_fileName, eventKind) {
                         if (eventKind === FileWatcherEventKind.Created && fileSystemEntryExists(fileOrDirectory, entryKind)) {
+                            // Call the callback for current file or directory
+                            // For now it could be callback for the inner directory creation,
+                            // but just return current directory, better than current no-op
                             invokeCallbackAndUpdateWatcher(watchPresentFileSystemEntry);
                         }
                     }, pollingInterval);
                 }
             }
             function watchFileUsingFsWatch(fileName, callback, pollingInterval) {
-                return fsWatch(fileName, 0, createFsWatchCallbackForFileWatcherCallback(fileName, callback), false, fsWatchFile, pollingInterval);
+                return fsWatch(fileName, 0 /* File */, createFsWatchCallbackForFileWatcherCallback(fileName, callback), /*recursive*/ false, fsWatchFile, pollingInterval);
             }
             function createWatchFileUsingDynamicWatchFile(watchFile) {
-                return function (fileName, callback, pollingInterval) { return fsWatch(fileName, 0, createFsWatchCallbackForFileWatcherCallback(fileName, callback), false, watchFile, pollingInterval); };
+                return function (fileName, callback, pollingInterval) { return fsWatch(fileName, 0 /* File */, createFsWatchCallbackForFileWatcherCallback(fileName, callback), /*recursive*/ false, watchFile, pollingInterval); };
             }
             function fsWatchDirectory(directoryName, callback, recursive) {
-                return fsWatch(directoryName, 1, callback, !!recursive, fsWatchFile);
+                return fsWatch(directoryName, 1 /* Directory */, callback, !!recursive, fsWatchFile);
             }
             function watchDirectoryUsingFsWatch(directoryName, callback, recursive) {
                 return fsWatchDirectory(directoryName, createFsWatchCallbackForDirectoryWatcherCallback(directoryName, callback), recursive);
@@ -3473,7 +4228,9 @@ var ts;
                 var buffer = _fs.readFileSync(fileName);
                 var len = buffer.length;
                 if (len >= 2 && buffer[0] === 0xFE && buffer[1] === 0xFF) {
-                    len &= ~1;
+                    // Big endian UTF-16 byte order mark detected. Since big endian is not supported by node.js,
+                    // flip all byte pairs and treat as little endian.
+                    len &= ~1; // Round down to a multiple of 2
                     for (var i = 0; i < len; i += 2) {
                         var temp = buffer[i];
                         buffer[i] = buffer[i + 1];
@@ -3482,21 +4239,25 @@ var ts;
                     return buffer.toString("utf16le", 2);
                 }
                 if (len >= 2 && buffer[0] === 0xFF && buffer[1] === 0xFE) {
+                    // Little endian UTF-16 byte order mark detected
                     return buffer.toString("utf16le", 2);
                 }
                 if (len >= 3 && buffer[0] === 0xEF && buffer[1] === 0xBB && buffer[2] === 0xBF) {
+                    // UTF-8 byte order mark detected
                     return buffer.toString("utf8", 3);
                 }
+                // Default is UTF-8 with no byte order mark
                 return buffer.toString("utf8");
             }
             function writeFile(fileName, data, writeByteOrderMark) {
+                // If a BOM is required, emit one
                 if (writeByteOrderMark) {
                     data = byteOrderMarkIndicator + data;
                 }
                 var fd;
                 try {
                     fd = _fs.openSync(fileName, "w");
-                    _fs.writeSync(fd, data, undefined, "utf8");
+                    _fs.writeSync(fd, data, /*position*/ undefined, "utf8");
                 }
                 finally {
                     if (fd !== undefined) {
@@ -3511,6 +4272,8 @@ var ts;
                     var directories = [];
                     for (var _i = 0, entries_1 = entries; _i < entries_1.length; _i++) {
                         var entry = entries_1[_i];
+                        // This is necessary because on some file system node fails to exclude
+                        // "." and "..". See https://github.com/nodejs/node/issues/4002
                         if (entry === "." || entry === "..") {
                             continue;
                         }
@@ -3542,8 +4305,8 @@ var ts;
                 try {
                     var stat = _fs.statSync(path);
                     switch (entryKind) {
-                        case 0: return stat.isFile();
-                        case 1: return stat.isDirectory();
+                        case 0 /* File */: return stat.isFile();
+                        case 1 /* Directory */: return stat.isDirectory();
                         default: return false;
                     }
                 }
@@ -3552,13 +4315,13 @@ var ts;
                 }
             }
             function fileExists(path) {
-                return fileSystemEntryExists(path, 0);
+                return fileSystemEntryExists(path, 0 /* File */);
             }
             function directoryExists(path) {
-                return fileSystemEntryExists(path, 1);
+                return fileSystemEntryExists(path, 1 /* Directory */);
             }
             function getDirectories(path) {
-                return ts.filter(_fs.readdirSync(path), function (dir) { return fileSystemEntryExists(ts.combinePaths(path, dir), 1); });
+                return ts.filter(_fs.readdirSync(path), function (dir) { return fileSystemEntryExists(ts.combinePaths(path, dir), 1 /* Directory */); });
             }
             function realpath(path) {
                 try {
@@ -3576,6 +4339,26 @@ var ts;
                     return undefined;
                 }
             }
+            function setModifiedTime(path, time) {
+                try {
+                    _fs.utimesSync(path, time, time);
+                }
+                catch (e) {
+                    return;
+                }
+            }
+            function deleteFile(path) {
+                try {
+                    return _fs.unlinkSync(path);
+                }
+                catch (e) {
+                    return;
+                }
+            }
+            /**
+             * djb2 hashing algorithm
+             * http://www.cse.yorku.ca/~oz/hash.html
+             */
             function generateDjb2Hash(data) {
                 var chars = data.split("").map(function (str) { return str.charCodeAt(0); });
                 return "" + chars.reduce(function (prev, curr) { return ((prev << 5) + prev) + curr; }, 5381);
@@ -3599,9 +4382,11 @@ var ts;
                 useCaseSensitiveFileNames: !!ChakraHost.useCaseSensitiveFileNames,
                 write: ChakraHost.echo,
                 readFile: function (path, _encoding) {
+                    // encoding is automatically handled by the implementation in ChakraHost
                     return ChakraHost.readFile(path);
                 },
                 writeFile: function (path, data, writeByteOrderMark) {
+                    // If a BOM is required, emit one
                     if (writeByteOrderMark) {
                         data = byteOrderMarkIndicator + data;
                     }
@@ -3638,9 +4423,12 @@ var ts;
             sys = getChakraSystem();
         }
         else if (typeof process !== "undefined" && process.nextTick && !process.browser && typeof require !== "undefined") {
+            // process and process.nextTick checks if current environment is node-like
+            // process.browser check excludes webpack and browserify
             sys = getNodeSystem();
         }
         if (sys) {
+            // patch writefile to create folder before writing the file
             var originalWriteFile_1 = sys.writeFile;
             sys.writeFile = function (path, data, writeBom) {
                 var directoryPath = ts.getDirectoryPath(ts.normalizeSlashes(path));
@@ -3655,18 +4443,22 @@ var ts;
     if (ts.sys && ts.sys.getEnvironmentVariable) {
         setCustomPollingValues(ts.sys);
         ts.Debug.currentAssertionLevel = /^development$/i.test(ts.sys.getEnvironmentVariable("NODE_ENV"))
-            ? 1
-            : 0;
+            ? 1 /* Normal */
+            : 0 /* None */;
     }
     if (ts.sys && ts.sys.debugMode) {
         ts.Debug.isDebugging = true;
     }
 })(ts || (ts = {}));
+// <auto-generated />
+// generated from './diagnosticInformationMap.generated.ts' by 'src\parser'
+/* @internal */
 var ts;
 (function (ts) {
     function diag(code, category, key, message, reportsUnnecessary) {
         return { code: code, category: category, key: key, message: message, reportsUnnecessary: reportsUnnecessary };
     }
+    // tslint:disable-next-line variable-name
     ts.Diagnostics = {
         Unterminated_string_literal: diag(1002, ts.DiagnosticCategory.Error, "Unterminated_string_literal_1002", "Unterminated string literal."),
         Identifier_expected: diag(1003, ts.DiagnosticCategory.Error, "Identifier_expected_1003", "Identifier expected."),
@@ -4229,7 +5021,7 @@ var ts;
         _0_is_a_primitive_but_1_is_a_wrapper_object_Prefer_using_0_when_possible: diag(2692, ts.DiagnosticCategory.Error, "_0_is_a_primitive_but_1_is_a_wrapper_object_Prefer_using_0_when_possible_2692", "'{0}' is a primitive, but '{1}' is a wrapper object. Prefer using '{0}' when possible."),
         _0_only_refers_to_a_type_but_is_being_used_as_a_value_here: diag(2693, ts.DiagnosticCategory.Error, "_0_only_refers_to_a_type_but_is_being_used_as_a_value_here_2693", "'{0}' only refers to a type, but is being used as a value here."),
         Namespace_0_has_no_exported_member_1: diag(2694, ts.DiagnosticCategory.Error, "Namespace_0_has_no_exported_member_1_2694", "Namespace '{0}' has no exported member '{1}'."),
-        Left_side_of_comma_operator_is_unused_and_has_no_side_effects: diag(2695, ts.DiagnosticCategory.Error, "Left_side_of_comma_operator_is_unused_and_has_no_side_effects_2695", "Left side of comma operator is unused and has no side effects.", true),
+        Left_side_of_comma_operator_is_unused_and_has_no_side_effects: diag(2695, ts.DiagnosticCategory.Error, "Left_side_of_comma_operator_is_unused_and_has_no_side_effects_2695", "Left side of comma operator is unused and has no side effects.", /*reportsUnnecessary*/ true),
         The_Object_type_is_assignable_to_very_few_other_types_Did_you_mean_to_use_the_any_type_instead: diag(2696, ts.DiagnosticCategory.Error, "The_Object_type_is_assignable_to_very_few_other_types_Did_you_mean_to_use_the_any_type_instead_2696", "The 'Object' type is assignable to very few other types. Did you mean to use the 'any' type instead?"),
         An_async_function_or_method_must_return_a_Promise_Make_sure_you_have_a_declaration_for_Promise_or_include_ES2015_in_your_lib_option: diag(2697, ts.DiagnosticCategory.Error, "An_async_function_or_method_must_return_a_Promise_Make_sure_you_have_a_declaration_for_Promise_or_in_2697", "An async function or method must return a 'Promise'. Make sure you have a declaration for 'Promise' or include 'ES2015' in your `--lib` option."),
         Spread_types_may_only_be_created_from_object_types: diag(2698, ts.DiagnosticCategory.Error, "Spread_types_may_only_be_created_from_object_types_2698", "Spread types may only be created from object types."),
@@ -4260,6 +5052,8 @@ var ts;
         Cannot_invoke_an_object_which_is_possibly_null_or_undefined: diag(2723, ts.DiagnosticCategory.Error, "Cannot_invoke_an_object_which_is_possibly_null_or_undefined_2723", "Cannot invoke an object which is possibly 'null' or 'undefined'."),
         Module_0_has_no_exported_member_1_Did_you_mean_2: diag(2724, ts.DiagnosticCategory.Error, "Module_0_has_no_exported_member_1_Did_you_mean_2_2724", "Module '{0}' has no exported member '{1}'. Did you mean '{2}'?"),
         Class_name_cannot_be_Object_when_targeting_ES5_with_module_0: diag(2725, ts.DiagnosticCategory.Error, "Class_name_cannot_be_Object_when_targeting_ES5_with_module_0_2725", "Class name cannot be 'Object' when targeting ES5 with module {0}."),
+        Cannot_find_lib_definition_for_0: diag(2726, ts.DiagnosticCategory.Error, "Cannot_find_lib_definition_for_0_2726", "Cannot find lib definition for '{0}'."),
+        Cannot_find_lib_definition_for_0_Did_you_mean_1: diag(2727, ts.DiagnosticCategory.Error, "Cannot_find_lib_definition_for_0_Did_you_mean_1_2727", "Cannot find lib definition for '{0}'. Did you mean '{1}'?"),
         Import_declaration_0_is_using_private_name_1: diag(4000, ts.DiagnosticCategory.Error, "Import_declaration_0_is_using_private_name_1_4000", "Import declaration '{0}' is using private name '{1}'."),
         Type_parameter_0_of_exported_class_has_or_is_using_private_name_1: diag(4002, ts.DiagnosticCategory.Error, "Type_parameter_0_of_exported_class_has_or_is_using_private_name_1_4002", "Type parameter '{0}' of exported class has or is using private name '{1}'."),
         Type_parameter_0_of_exported_interface_has_or_is_using_private_name_1: diag(4004, ts.DiagnosticCategory.Error, "Type_parameter_0_of_exported_interface_has_or_is_using_private_name_1_4004", "Type parameter '{0}' of exported interface has or is using private name '{1}'."),
@@ -4493,12 +5287,12 @@ var ts;
         Resolving_real_path_for_0_result_1: diag(6130, ts.DiagnosticCategory.Message, "Resolving_real_path_for_0_result_1_6130", "Resolving real path for '{0}', result '{1}'."),
         Cannot_compile_modules_using_option_0_unless_the_module_flag_is_amd_or_system: diag(6131, ts.DiagnosticCategory.Error, "Cannot_compile_modules_using_option_0_unless_the_module_flag_is_amd_or_system_6131", "Cannot compile modules using option '{0}' unless the '--module' flag is 'amd' or 'system'."),
         File_name_0_has_a_1_extension_stripping_it: diag(6132, ts.DiagnosticCategory.Message, "File_name_0_has_a_1_extension_stripping_it_6132", "File name '{0}' has a '{1}' extension - stripping it."),
-        _0_is_declared_but_its_value_is_never_read: diag(6133, ts.DiagnosticCategory.Error, "_0_is_declared_but_its_value_is_never_read_6133", "'{0}' is declared but its value is never read.", true),
+        _0_is_declared_but_its_value_is_never_read: diag(6133, ts.DiagnosticCategory.Error, "_0_is_declared_but_its_value_is_never_read_6133", "'{0}' is declared but its value is never read.", /*reportsUnnecessary*/ true),
         Report_errors_on_unused_locals: diag(6134, ts.DiagnosticCategory.Message, "Report_errors_on_unused_locals_6134", "Report errors on unused locals."),
         Report_errors_on_unused_parameters: diag(6135, ts.DiagnosticCategory.Message, "Report_errors_on_unused_parameters_6135", "Report errors on unused parameters."),
         The_maximum_dependency_depth_to_search_under_node_modules_and_load_JavaScript_files: diag(6136, ts.DiagnosticCategory.Message, "The_maximum_dependency_depth_to_search_under_node_modules_and_load_JavaScript_files_6136", "The maximum dependency depth to search under node_modules and load JavaScript files."),
         Cannot_import_type_declaration_files_Consider_importing_0_instead_of_1: diag(6137, ts.DiagnosticCategory.Error, "Cannot_import_type_declaration_files_Consider_importing_0_instead_of_1_6137", "Cannot import type declaration files. Consider importing '{0}' instead of '{1}'."),
-        Property_0_is_declared_but_its_value_is_never_read: diag(6138, ts.DiagnosticCategory.Error, "Property_0_is_declared_but_its_value_is_never_read_6138", "Property '{0}' is declared but its value is never read.", true),
+        Property_0_is_declared_but_its_value_is_never_read: diag(6138, ts.DiagnosticCategory.Error, "Property_0_is_declared_but_its_value_is_never_read_6138", "Property '{0}' is declared but its value is never read.", /*reportsUnnecessary*/ true),
         Import_emit_helpers_from_tslib: diag(6139, ts.DiagnosticCategory.Message, "Import_emit_helpers_from_tslib_6139", "Import emit helpers from 'tslib'."),
         Auto_discovery_for_typings_is_enabled_in_project_0_Running_extra_resolution_pass_for_module_1_using_cache_location_2: diag(6140, ts.DiagnosticCategory.Error, "Auto_discovery_for_typings_is_enabled_in_project_0_Running_extra_resolution_pass_for_module_1_using__6140", "Auto discovery for typings is enabled in project '{0}'. Running extra resolution pass for module '{1}' using cache location '{2}'."),
         Parse_in_strict_mode_and_emit_use_strict_for_each_source_file: diag(6141, ts.DiagnosticCategory.Message, "Parse_in_strict_mode_and_emit_use_strict_for_each_source_file_6141", "Parse in strict mode and emit \"use strict\" for each source file."),
@@ -4551,14 +5345,14 @@ var ts;
         Multiple_consecutive_numeric_separators_are_not_permitted: diag(6189, ts.DiagnosticCategory.Error, "Multiple_consecutive_numeric_separators_are_not_permitted_6189", "Multiple consecutive numeric separators are not permitted."),
         Found_package_json_at_0_Package_ID_is_1: diag(6190, ts.DiagnosticCategory.Message, "Found_package_json_at_0_Package_ID_is_1_6190", "Found 'package.json' at '{0}'. Package ID is '{1}'."),
         Whether_to_keep_outdated_console_output_in_watch_mode_instead_of_clearing_the_screen: diag(6191, ts.DiagnosticCategory.Message, "Whether_to_keep_outdated_console_output_in_watch_mode_instead_of_clearing_the_screen_6191", "Whether to keep outdated console output in watch mode instead of clearing the screen."),
-        All_imports_in_import_declaration_are_unused: diag(6192, ts.DiagnosticCategory.Error, "All_imports_in_import_declaration_are_unused_6192", "All imports in import declaration are unused.", true),
+        All_imports_in_import_declaration_are_unused: diag(6192, ts.DiagnosticCategory.Error, "All_imports_in_import_declaration_are_unused_6192", "All imports in import declaration are unused.", /*reportsUnnecessary*/ true),
         Found_1_error_Watching_for_file_changes: diag(6193, ts.DiagnosticCategory.Message, "Found_1_error_Watching_for_file_changes_6193", "Found 1 error. Watching for file changes."),
         Found_0_errors_Watching_for_file_changes: diag(6194, ts.DiagnosticCategory.Message, "Found_0_errors_Watching_for_file_changes_6194", "Found {0} errors. Watching for file changes."),
         Resolve_keyof_to_string_valued_property_names_only_no_numbers_or_symbols: diag(6195, ts.DiagnosticCategory.Message, "Resolve_keyof_to_string_valued_property_names_only_no_numbers_or_symbols_6195", "Resolve 'keyof' to string valued property names only (no numbers or symbols)."),
-        _0_is_declared_but_never_used: diag(6196, ts.DiagnosticCategory.Error, "_0_is_declared_but_never_used_6196", "'{0}' is declared but never used.", true),
+        _0_is_declared_but_never_used: diag(6196, ts.DiagnosticCategory.Error, "_0_is_declared_but_never_used_6196", "'{0}' is declared but never used.", /*reportsUnnecessary*/ true),
         Include_modules_imported_with_json_extension: diag(6197, ts.DiagnosticCategory.Message, "Include_modules_imported_with_json_extension_6197", "Include modules imported with '.json' extension"),
-        All_destructured_elements_are_unused: diag(6198, ts.DiagnosticCategory.Error, "All_destructured_elements_are_unused_6198", "All destructured elements are unused.", true),
-        All_variables_are_unused: diag(6199, ts.DiagnosticCategory.Error, "All_variables_are_unused_6199", "All variables are unused.", true),
+        All_destructured_elements_are_unused: diag(6198, ts.DiagnosticCategory.Error, "All_destructured_elements_are_unused_6198", "All destructured elements are unused.", /*reportsUnnecessary*/ true),
+        All_variables_are_unused: diag(6199, ts.DiagnosticCategory.Error, "All_variables_are_unused_6199", "All variables are unused.", /*reportsUnnecessary*/ true),
         Projects_to_reference: diag(6300, ts.DiagnosticCategory.Message, "Projects_to_reference_6300", "Projects to reference"),
         Enable_project_compilation: diag(6302, ts.DiagnosticCategory.Message, "Enable_project_compilation_6302", "Enable project compilation"),
         Project_references_may_not_form_a_circular_graph_Cycle_detected_Colon_0: diag(6202, ts.DiagnosticCategory.Error, "Project_references_may_not_form_a_circular_graph_Cycle_detected_Colon_0_6202", "Project references may not form a circular graph. Cycle detected: {0}"),
@@ -4568,6 +5362,28 @@ var ts;
         File_0_is_not_in_project_file_list_Projects_must_list_all_files_or_use_an_include_pattern: diag(6307, ts.DiagnosticCategory.Error, "File_0_is_not_in_project_file_list_Projects_must_list_all_files_or_use_an_include_pattern_6307", "File '{0}' is not in project file list. Projects must list all files or use an 'include' pattern."),
         Cannot_prepend_project_0_because_it_does_not_have_outFile_set: diag(6308, ts.DiagnosticCategory.Error, "Cannot_prepend_project_0_because_it_does_not_have_outFile_set_6308", "Cannot prepend project '{0}' because it does not have 'outFile' set"),
         Output_file_0_from_project_1_does_not_exist: diag(6309, ts.DiagnosticCategory.Error, "Output_file_0_from_project_1_does_not_exist_6309", "Output file '{0}' from project '{1}' does not exist"),
+        Project_0_is_out_of_date_because_oldest_output_1_is_older_than_newest_input_2: diag(6350, ts.DiagnosticCategory.Message, "Project_0_is_out_of_date_because_oldest_output_1_is_older_than_newest_input_2_6350", "Project '{0}' is out of date because oldest output '{1}' is older than newest input '{2}'"),
+        Project_0_is_up_to_date_because_newest_input_1_is_older_than_oldest_output_2: diag(6351, ts.DiagnosticCategory.Message, "Project_0_is_up_to_date_because_newest_input_1_is_older_than_oldest_output_2_6351", "Project '{0}' is up to date because newest input '{1}' is older than oldest output '{2}'"),
+        Project_0_is_out_of_date_because_output_file_1_does_not_exist: diag(6352, ts.DiagnosticCategory.Message, "Project_0_is_out_of_date_because_output_file_1_does_not_exist_6352", "Project '{0}' is out of date because output file '{1}' does not exist"),
+        Project_0_is_out_of_date_because_its_dependency_1_is_out_of_date: diag(6353, ts.DiagnosticCategory.Message, "Project_0_is_out_of_date_because_its_dependency_1_is_out_of_date_6353", "Project '{0}' is out of date because its dependency '{1}' is out of date"),
+        Project_0_is_up_to_date_with_d_ts_files_from_its_dependencies: diag(6354, ts.DiagnosticCategory.Message, "Project_0_is_up_to_date_with_d_ts_files_from_its_dependencies_6354", "Project '{0}' is up to date with .d.ts files from its dependencies"),
+        Projects_in_this_build_Colon_0: diag(6355, ts.DiagnosticCategory.Message, "Projects_in_this_build_Colon_0_6355", "Projects in this build: {0}"),
+        A_non_dry_build_would_delete_the_following_files_Colon_0: diag(6356, ts.DiagnosticCategory.Message, "A_non_dry_build_would_delete_the_following_files_Colon_0_6356", "A non-dry build would delete the following files: {0}"),
+        A_non_dry_build_would_build_project_0: diag(6357, ts.DiagnosticCategory.Message, "A_non_dry_build_would_build_project_0_6357", "A non-dry build would build project '{0}'"),
+        Building_project_0: diag(6358, ts.DiagnosticCategory.Message, "Building_project_0_6358", "Building project '{0}'..."),
+        Updating_output_timestamps_of_project_0: diag(6359, ts.DiagnosticCategory.Message, "Updating_output_timestamps_of_project_0_6359", "Updating output timestamps of project '{0}'..."),
+        delete_this_Project_0_is_up_to_date_because_it_was_previously_built: diag(6360, ts.DiagnosticCategory.Message, "delete_this_Project_0_is_up_to_date_because_it_was_previously_built_6360", "delete this - Project '{0}' is up to date because it was previously built"),
+        Project_0_is_up_to_date: diag(6361, ts.DiagnosticCategory.Message, "Project_0_is_up_to_date_6361", "Project '{0}' is up to date"),
+        Skipping_build_of_project_0_because_its_dependency_1_has_errors: diag(6362, ts.DiagnosticCategory.Message, "Skipping_build_of_project_0_because_its_dependency_1_has_errors_6362", "Skipping build of project '{0}' because its dependency '{1}' has errors"),
+        Project_0_can_t_be_built_because_its_dependency_1_has_errors: diag(6363, ts.DiagnosticCategory.Message, "Project_0_can_t_be_built_because_its_dependency_1_has_errors_6363", "Project '{0}' can't be built because its dependency '{1}' has errors"),
+        Build_one_or_more_projects_and_their_dependencies_if_out_of_date: diag(6364, ts.DiagnosticCategory.Message, "Build_one_or_more_projects_and_their_dependencies_if_out_of_date_6364", "Build one or more projects and their dependencies, if out of date"),
+        Delete_the_outputs_of_all_projects: diag(6365, ts.DiagnosticCategory.Message, "Delete_the_outputs_of_all_projects_6365", "Delete the outputs of all projects"),
+        Enable_verbose_logging: diag(6366, ts.DiagnosticCategory.Message, "Enable_verbose_logging_6366", "Enable verbose logging"),
+        Show_what_would_be_built_or_deleted_if_specified_with_clean: diag(6367, ts.DiagnosticCategory.Message, "Show_what_would_be_built_or_deleted_if_specified_with_clean_6367", "Show what would be built (or deleted, if specified with '--clean')"),
+        Build_all_projects_including_those_that_appear_to_be_up_to_date: diag(6368, ts.DiagnosticCategory.Message, "Build_all_projects_including_those_that_appear_to_be_up_to_date_6368", "Build all projects, including those that appear to be up to date"),
+        Option_build_must_be_the_first_command_line_argument: diag(6369, ts.DiagnosticCategory.Error, "Option_build_must_be_the_first_command_line_argument_6369", "Option '--build' must be the first command line argument."),
+        Options_0_and_1_cannot_be_combined: diag(6370, ts.DiagnosticCategory.Error, "Options_0_and_1_cannot_be_combined_6370", "Options '{0}' and '{1}' cannot be combined."),
+        Skipping_clean_because_not_all_projects_could_be_located: diag(6371, ts.DiagnosticCategory.Error, "Skipping_clean_because_not_all_projects_could_be_located_6371", "Skipping clean because not all projects could be located"),
         Variable_0_implicitly_has_an_1_type: diag(7005, ts.DiagnosticCategory.Error, "Variable_0_implicitly_has_an_1_type_7005", "Variable '{0}' implicitly has an '{1}' type."),
         Parameter_0_implicitly_has_an_1_type: diag(7006, ts.DiagnosticCategory.Error, "Parameter_0_implicitly_has_an_1_type_7006", "Parameter '{0}' implicitly has an '{1}' type."),
         Member_0_implicitly_has_an_1_type: diag(7008, ts.DiagnosticCategory.Error, "Member_0_implicitly_has_an_1_type_7008", "Member '{0}' implicitly has an '{1}' type."),
@@ -4586,8 +5402,8 @@ var ts;
         Function_implicitly_has_return_type_any_because_it_does_not_have_a_return_type_annotation_and_is_referenced_directly_or_indirectly_in_one_of_its_return_expressions: diag(7024, ts.DiagnosticCategory.Error, "Function_implicitly_has_return_type_any_because_it_does_not_have_a_return_type_annotation_and_is_ref_7024", "Function implicitly has return type 'any' because it does not have a return type annotation and is referenced directly or indirectly in one of its return expressions."),
         Generator_implicitly_has_type_0_because_it_does_not_yield_any_values_Consider_supplying_a_return_type: diag(7025, ts.DiagnosticCategory.Error, "Generator_implicitly_has_type_0_because_it_does_not_yield_any_values_Consider_supplying_a_return_typ_7025", "Generator implicitly has type '{0}' because it does not yield any values. Consider supplying a return type."),
         JSX_element_implicitly_has_type_any_because_no_interface_JSX_0_exists: diag(7026, ts.DiagnosticCategory.Error, "JSX_element_implicitly_has_type_any_because_no_interface_JSX_0_exists_7026", "JSX element implicitly has type 'any' because no interface 'JSX.{0}' exists."),
-        Unreachable_code_detected: diag(7027, ts.DiagnosticCategory.Error, "Unreachable_code_detected_7027", "Unreachable code detected.", true),
-        Unused_label: diag(7028, ts.DiagnosticCategory.Error, "Unused_label_7028", "Unused label.", true),
+        Unreachable_code_detected: diag(7027, ts.DiagnosticCategory.Error, "Unreachable_code_detected_7027", "Unreachable code detected.", /*reportsUnnecessary*/ true),
+        Unused_label: diag(7028, ts.DiagnosticCategory.Error, "Unused_label_7028", "Unused label.", /*reportsUnnecessary*/ true),
         Fallthrough_case_in_switch: diag(7029, ts.DiagnosticCategory.Error, "Fallthrough_case_in_switch_7029", "Fallthrough case in switch."),
         Not_all_code_paths_return_a_value: diag(7030, ts.DiagnosticCategory.Error, "Not_all_code_paths_return_a_value_7030", "Not all code paths return a value."),
         Binding_element_0_implicitly_has_an_1_type: diag(7031, ts.DiagnosticCategory.Error, "Binding_element_0_implicitly_has_an_1_type_7031", "Binding element '{0}' implicitly has an '{1}' type."),
@@ -4744,157 +5560,204 @@ var ts;
 })(ts || (ts = {}));
 var ts;
 (function (ts) {
+    /* @internal */
     function tokenIsIdentifierOrKeyword(token) {
-        return token >= 71;
+        return token >= 71 /* Identifier */;
     }
     ts.tokenIsIdentifierOrKeyword = tokenIsIdentifierOrKeyword;
+    /* @internal */
     function tokenIsIdentifierOrKeywordOrGreaterThan(token) {
-        return token === 29 || tokenIsIdentifierOrKeyword(token);
+        return token === 29 /* GreaterThanToken */ || tokenIsIdentifierOrKeyword(token);
     }
     ts.tokenIsIdentifierOrKeywordOrGreaterThan = tokenIsIdentifierOrKeywordOrGreaterThan;
     var textToToken = ts.createMapFromTemplate({
-        "abstract": 117,
-        "any": 119,
-        "as": 118,
-        "boolean": 122,
-        "break": 72,
-        "case": 73,
-        "catch": 74,
-        "class": 75,
-        "continue": 77,
-        "const": 76,
-        "constructor": 123,
-        "debugger": 78,
-        "declare": 124,
-        "default": 79,
-        "delete": 80,
-        "do": 81,
-        "else": 82,
-        "enum": 83,
-        "export": 84,
-        "extends": 85,
-        "false": 86,
-        "finally": 87,
-        "for": 88,
-        "from": 143,
-        "function": 89,
-        "get": 125,
-        "if": 90,
-        "implements": 108,
-        "import": 91,
-        "in": 92,
-        "infer": 126,
-        "instanceof": 93,
-        "interface": 109,
-        "is": 127,
-        "keyof": 128,
-        "let": 110,
-        "module": 129,
-        "namespace": 130,
-        "never": 131,
-        "new": 94,
-        "null": 95,
-        "number": 134,
-        "object": 135,
-        "package": 111,
-        "private": 112,
-        "protected": 113,
-        "public": 114,
-        "readonly": 132,
-        "require": 133,
-        "global": 144,
-        "return": 96,
-        "set": 136,
-        "static": 115,
-        "string": 137,
-        "super": 97,
-        "switch": 98,
-        "symbol": 138,
-        "this": 99,
-        "throw": 100,
-        "true": 101,
-        "try": 102,
-        "type": 139,
-        "typeof": 103,
-        "undefined": 140,
-        "unique": 141,
-        "unknown": 142,
-        "var": 104,
-        "void": 105,
-        "while": 106,
-        "with": 107,
-        "yield": 116,
-        "async": 120,
-        "await": 121,
-        "of": 145,
-        "{": 17,
-        "}": 18,
-        "(": 19,
-        ")": 20,
-        "[": 21,
-        "]": 22,
-        ".": 23,
-        "...": 24,
-        ";": 25,
-        ",": 26,
-        "<": 27,
-        ">": 29,
-        "<=": 30,
-        ">=": 31,
-        "==": 32,
-        "!=": 33,
-        "===": 34,
-        "!==": 35,
-        "=>": 36,
-        "+": 37,
-        "-": 38,
-        "**": 40,
-        "*": 39,
-        "/": 41,
-        "%": 42,
-        "++": 43,
-        "--": 44,
-        "<<": 45,
-        "</": 28,
-        ">>": 46,
-        ">>>": 47,
-        "&": 48,
-        "|": 49,
-        "^": 50,
-        "!": 51,
-        "~": 52,
-        "&&": 53,
-        "||": 54,
-        "?": 55,
-        ":": 56,
-        "=": 58,
-        "+=": 59,
-        "-=": 60,
-        "*=": 61,
-        "**=": 62,
-        "/=": 63,
-        "%=": 64,
-        "<<=": 65,
-        ">>=": 66,
-        ">>>=": 67,
-        "&=": 68,
-        "|=": 69,
-        "^=": 70,
-        "@": 57,
+        "abstract": 117 /* AbstractKeyword */,
+        "any": 119 /* AnyKeyword */,
+        "as": 118 /* AsKeyword */,
+        "boolean": 122 /* BooleanKeyword */,
+        "break": 72 /* BreakKeyword */,
+        "case": 73 /* CaseKeyword */,
+        "catch": 74 /* CatchKeyword */,
+        "class": 75 /* ClassKeyword */,
+        "continue": 77 /* ContinueKeyword */,
+        "const": 76 /* ConstKeyword */,
+        "constructor": 123 /* ConstructorKeyword */,
+        "debugger": 78 /* DebuggerKeyword */,
+        "declare": 124 /* DeclareKeyword */,
+        "default": 79 /* DefaultKeyword */,
+        "delete": 80 /* DeleteKeyword */,
+        "do": 81 /* DoKeyword */,
+        "else": 82 /* ElseKeyword */,
+        "enum": 83 /* EnumKeyword */,
+        "export": 84 /* ExportKeyword */,
+        "extends": 85 /* ExtendsKeyword */,
+        "false": 86 /* FalseKeyword */,
+        "finally": 87 /* FinallyKeyword */,
+        "for": 88 /* ForKeyword */,
+        "from": 143 /* FromKeyword */,
+        "function": 89 /* FunctionKeyword */,
+        "get": 125 /* GetKeyword */,
+        "if": 90 /* IfKeyword */,
+        "implements": 108 /* ImplementsKeyword */,
+        "import": 91 /* ImportKeyword */,
+        "in": 92 /* InKeyword */,
+        "infer": 126 /* InferKeyword */,
+        "instanceof": 93 /* InstanceOfKeyword */,
+        "interface": 109 /* InterfaceKeyword */,
+        "is": 127 /* IsKeyword */,
+        "keyof": 128 /* KeyOfKeyword */,
+        "let": 110 /* LetKeyword */,
+        "module": 129 /* ModuleKeyword */,
+        "namespace": 130 /* NamespaceKeyword */,
+        "never": 131 /* NeverKeyword */,
+        "new": 94 /* NewKeyword */,
+        "null": 95 /* NullKeyword */,
+        "number": 134 /* NumberKeyword */,
+        "object": 135 /* ObjectKeyword */,
+        "package": 111 /* PackageKeyword */,
+        "private": 112 /* PrivateKeyword */,
+        "protected": 113 /* ProtectedKeyword */,
+        "public": 114 /* PublicKeyword */,
+        "readonly": 132 /* ReadonlyKeyword */,
+        "require": 133 /* RequireKeyword */,
+        "global": 144 /* GlobalKeyword */,
+        "return": 96 /* ReturnKeyword */,
+        "set": 136 /* SetKeyword */,
+        "static": 115 /* StaticKeyword */,
+        "string": 137 /* StringKeyword */,
+        "super": 97 /* SuperKeyword */,
+        "switch": 98 /* SwitchKeyword */,
+        "symbol": 138 /* SymbolKeyword */,
+        "this": 99 /* ThisKeyword */,
+        "throw": 100 /* ThrowKeyword */,
+        "true": 101 /* TrueKeyword */,
+        "try": 102 /* TryKeyword */,
+        "type": 139 /* TypeKeyword */,
+        "typeof": 103 /* TypeOfKeyword */,
+        "undefined": 140 /* UndefinedKeyword */,
+        "unique": 141 /* UniqueKeyword */,
+        "unknown": 142 /* UnknownKeyword */,
+        "var": 104 /* VarKeyword */,
+        "void": 105 /* VoidKeyword */,
+        "while": 106 /* WhileKeyword */,
+        "with": 107 /* WithKeyword */,
+        "yield": 116 /* YieldKeyword */,
+        "async": 120 /* AsyncKeyword */,
+        "await": 121 /* AwaitKeyword */,
+        "of": 145 /* OfKeyword */,
+        "{": 17 /* OpenBraceToken */,
+        "}": 18 /* CloseBraceToken */,
+        "(": 19 /* OpenParenToken */,
+        ")": 20 /* CloseParenToken */,
+        "[": 21 /* OpenBracketToken */,
+        "]": 22 /* CloseBracketToken */,
+        ".": 23 /* DotToken */,
+        "...": 24 /* DotDotDotToken */,
+        ";": 25 /* SemicolonToken */,
+        ",": 26 /* CommaToken */,
+        "<": 27 /* LessThanToken */,
+        ">": 29 /* GreaterThanToken */,
+        "<=": 30 /* LessThanEqualsToken */,
+        ">=": 31 /* GreaterThanEqualsToken */,
+        "==": 32 /* EqualsEqualsToken */,
+        "!=": 33 /* ExclamationEqualsToken */,
+        "===": 34 /* EqualsEqualsEqualsToken */,
+        "!==": 35 /* ExclamationEqualsEqualsToken */,
+        "=>": 36 /* EqualsGreaterThanToken */,
+        "+": 37 /* PlusToken */,
+        "-": 38 /* MinusToken */,
+        "**": 40 /* AsteriskAsteriskToken */,
+        "*": 39 /* AsteriskToken */,
+        "/": 41 /* SlashToken */,
+        "%": 42 /* PercentToken */,
+        "++": 43 /* PlusPlusToken */,
+        "--": 44 /* MinusMinusToken */,
+        "<<": 45 /* LessThanLessThanToken */,
+        "</": 28 /* LessThanSlashToken */,
+        ">>": 46 /* GreaterThanGreaterThanToken */,
+        ">>>": 47 /* GreaterThanGreaterThanGreaterThanToken */,
+        "&": 48 /* AmpersandToken */,
+        "|": 49 /* BarToken */,
+        "^": 50 /* CaretToken */,
+        "!": 51 /* ExclamationToken */,
+        "~": 52 /* TildeToken */,
+        "&&": 53 /* AmpersandAmpersandToken */,
+        "||": 54 /* BarBarToken */,
+        "?": 55 /* QuestionToken */,
+        ":": 56 /* ColonToken */,
+        "=": 58 /* EqualsToken */,
+        "+=": 59 /* PlusEqualsToken */,
+        "-=": 60 /* MinusEqualsToken */,
+        "*=": 61 /* AsteriskEqualsToken */,
+        "**=": 62 /* AsteriskAsteriskEqualsToken */,
+        "/=": 63 /* SlashEqualsToken */,
+        "%=": 64 /* PercentEqualsToken */,
+        "<<=": 65 /* LessThanLessThanEqualsToken */,
+        ">>=": 66 /* GreaterThanGreaterThanEqualsToken */,
+        ">>>=": 67 /* GreaterThanGreaterThanGreaterThanEqualsToken */,
+        "&=": 68 /* AmpersandEqualsToken */,
+        "|=": 69 /* BarEqualsToken */,
+        "^=": 70 /* CaretEqualsToken */,
+        "@": 57 /* AtToken */,
     });
+    /*
+        As per ECMAScript Language Specification 3th Edition, Section 7.6: Identifiers
+        IdentifierStart ::
+            Can contain Unicode 3.0.0 categories:
+            Uppercase letter (Lu),
+            Lowercase letter (Ll),
+            Titlecase letter (Lt),
+            Modifier letter (Lm),
+            Other letter (Lo), or
+            Letter number (Nl).
+        IdentifierPart :: =
+            Can contain IdentifierStart + Unicode 3.0.0 categories:
+            Non-spacing mark (Mn),
+            Combining spacing mark (Mc),
+            Decimal number (Nd), or
+            Connector punctuation (Pc).
+
+        Codepoint ranges for ES3 Identifiers are extracted from the Unicode 3.0.0 specification at:
+        http://www.unicode.org/Public/3.0-Update/UnicodeData-3.0.0.txt
+    */
     var unicodeES3IdentifierStart = [170, 170, 181, 181, 186, 186, 192, 214, 216, 246, 248, 543, 546, 563, 592, 685, 688, 696, 699, 705, 720, 721, 736, 740, 750, 750, 890, 890, 902, 902, 904, 906, 908, 908, 910, 929, 931, 974, 976, 983, 986, 1011, 1024, 1153, 1164, 1220, 1223, 1224, 1227, 1228, 1232, 1269, 1272, 1273, 1329, 1366, 1369, 1369, 1377, 1415, 1488, 1514, 1520, 1522, 1569, 1594, 1600, 1610, 1649, 1747, 1749, 1749, 1765, 1766, 1786, 1788, 1808, 1808, 1810, 1836, 1920, 1957, 2309, 2361, 2365, 2365, 2384, 2384, 2392, 2401, 2437, 2444, 2447, 2448, 2451, 2472, 2474, 2480, 2482, 2482, 2486, 2489, 2524, 2525, 2527, 2529, 2544, 2545, 2565, 2570, 2575, 2576, 2579, 2600, 2602, 2608, 2610, 2611, 2613, 2614, 2616, 2617, 2649, 2652, 2654, 2654, 2674, 2676, 2693, 2699, 2701, 2701, 2703, 2705, 2707, 2728, 2730, 2736, 2738, 2739, 2741, 2745, 2749, 2749, 2768, 2768, 2784, 2784, 2821, 2828, 2831, 2832, 2835, 2856, 2858, 2864, 2866, 2867, 2870, 2873, 2877, 2877, 2908, 2909, 2911, 2913, 2949, 2954, 2958, 2960, 2962, 2965, 2969, 2970, 2972, 2972, 2974, 2975, 2979, 2980, 2984, 2986, 2990, 2997, 2999, 3001, 3077, 3084, 3086, 3088, 3090, 3112, 3114, 3123, 3125, 3129, 3168, 3169, 3205, 3212, 3214, 3216, 3218, 3240, 3242, 3251, 3253, 3257, 3294, 3294, 3296, 3297, 3333, 3340, 3342, 3344, 3346, 3368, 3370, 3385, 3424, 3425, 3461, 3478, 3482, 3505, 3507, 3515, 3517, 3517, 3520, 3526, 3585, 3632, 3634, 3635, 3648, 3654, 3713, 3714, 3716, 3716, 3719, 3720, 3722, 3722, 3725, 3725, 3732, 3735, 3737, 3743, 3745, 3747, 3749, 3749, 3751, 3751, 3754, 3755, 3757, 3760, 3762, 3763, 3773, 3773, 3776, 3780, 3782, 3782, 3804, 3805, 3840, 3840, 3904, 3911, 3913, 3946, 3976, 3979, 4096, 4129, 4131, 4135, 4137, 4138, 4176, 4181, 4256, 4293, 4304, 4342, 4352, 4441, 4447, 4514, 4520, 4601, 4608, 4614, 4616, 4678, 4680, 4680, 4682, 4685, 4688, 4694, 4696, 4696, 4698, 4701, 4704, 4742, 4744, 4744, 4746, 4749, 4752, 4782, 4784, 4784, 4786, 4789, 4792, 4798, 4800, 4800, 4802, 4805, 4808, 4814, 4816, 4822, 4824, 4846, 4848, 4878, 4880, 4880, 4882, 4885, 4888, 4894, 4896, 4934, 4936, 4954, 5024, 5108, 5121, 5740, 5743, 5750, 5761, 5786, 5792, 5866, 6016, 6067, 6176, 6263, 6272, 6312, 7680, 7835, 7840, 7929, 7936, 7957, 7960, 7965, 7968, 8005, 8008, 8013, 8016, 8023, 8025, 8025, 8027, 8027, 8029, 8029, 8031, 8061, 8064, 8116, 8118, 8124, 8126, 8126, 8130, 8132, 8134, 8140, 8144, 8147, 8150, 8155, 8160, 8172, 8178, 8180, 8182, 8188, 8319, 8319, 8450, 8450, 8455, 8455, 8458, 8467, 8469, 8469, 8473, 8477, 8484, 8484, 8486, 8486, 8488, 8488, 8490, 8493, 8495, 8497, 8499, 8505, 8544, 8579, 12293, 12295, 12321, 12329, 12337, 12341, 12344, 12346, 12353, 12436, 12445, 12446, 12449, 12538, 12540, 12542, 12549, 12588, 12593, 12686, 12704, 12727, 13312, 19893, 19968, 40869, 40960, 42124, 44032, 55203, 63744, 64045, 64256, 64262, 64275, 64279, 64285, 64285, 64287, 64296, 64298, 64310, 64312, 64316, 64318, 64318, 64320, 64321, 64323, 64324, 64326, 64433, 64467, 64829, 64848, 64911, 64914, 64967, 65008, 65019, 65136, 65138, 65140, 65140, 65142, 65276, 65313, 65338, 65345, 65370, 65382, 65470, 65474, 65479, 65482, 65487, 65490, 65495, 65498, 65500,];
     var unicodeES3IdentifierPart = [170, 170, 181, 181, 186, 186, 192, 214, 216, 246, 248, 543, 546, 563, 592, 685, 688, 696, 699, 705, 720, 721, 736, 740, 750, 750, 768, 846, 864, 866, 890, 890, 902, 902, 904, 906, 908, 908, 910, 929, 931, 974, 976, 983, 986, 1011, 1024, 1153, 1155, 1158, 1164, 1220, 1223, 1224, 1227, 1228, 1232, 1269, 1272, 1273, 1329, 1366, 1369, 1369, 1377, 1415, 1425, 1441, 1443, 1465, 1467, 1469, 1471, 1471, 1473, 1474, 1476, 1476, 1488, 1514, 1520, 1522, 1569, 1594, 1600, 1621, 1632, 1641, 1648, 1747, 1749, 1756, 1759, 1768, 1770, 1773, 1776, 1788, 1808, 1836, 1840, 1866, 1920, 1968, 2305, 2307, 2309, 2361, 2364, 2381, 2384, 2388, 2392, 2403, 2406, 2415, 2433, 2435, 2437, 2444, 2447, 2448, 2451, 2472, 2474, 2480, 2482, 2482, 2486, 2489, 2492, 2492, 2494, 2500, 2503, 2504, 2507, 2509, 2519, 2519, 2524, 2525, 2527, 2531, 2534, 2545, 2562, 2562, 2565, 2570, 2575, 2576, 2579, 2600, 2602, 2608, 2610, 2611, 2613, 2614, 2616, 2617, 2620, 2620, 2622, 2626, 2631, 2632, 2635, 2637, 2649, 2652, 2654, 2654, 2662, 2676, 2689, 2691, 2693, 2699, 2701, 2701, 2703, 2705, 2707, 2728, 2730, 2736, 2738, 2739, 2741, 2745, 2748, 2757, 2759, 2761, 2763, 2765, 2768, 2768, 2784, 2784, 2790, 2799, 2817, 2819, 2821, 2828, 2831, 2832, 2835, 2856, 2858, 2864, 2866, 2867, 2870, 2873, 2876, 2883, 2887, 2888, 2891, 2893, 2902, 2903, 2908, 2909, 2911, 2913, 2918, 2927, 2946, 2947, 2949, 2954, 2958, 2960, 2962, 2965, 2969, 2970, 2972, 2972, 2974, 2975, 2979, 2980, 2984, 2986, 2990, 2997, 2999, 3001, 3006, 3010, 3014, 3016, 3018, 3021, 3031, 3031, 3047, 3055, 3073, 3075, 3077, 3084, 3086, 3088, 3090, 3112, 3114, 3123, 3125, 3129, 3134, 3140, 3142, 3144, 3146, 3149, 3157, 3158, 3168, 3169, 3174, 3183, 3202, 3203, 3205, 3212, 3214, 3216, 3218, 3240, 3242, 3251, 3253, 3257, 3262, 3268, 3270, 3272, 3274, 3277, 3285, 3286, 3294, 3294, 3296, 3297, 3302, 3311, 3330, 3331, 3333, 3340, 3342, 3344, 3346, 3368, 3370, 3385, 3390, 3395, 3398, 3400, 3402, 3405, 3415, 3415, 3424, 3425, 3430, 3439, 3458, 3459, 3461, 3478, 3482, 3505, 3507, 3515, 3517, 3517, 3520, 3526, 3530, 3530, 3535, 3540, 3542, 3542, 3544, 3551, 3570, 3571, 3585, 3642, 3648, 3662, 3664, 3673, 3713, 3714, 3716, 3716, 3719, 3720, 3722, 3722, 3725, 3725, 3732, 3735, 3737, 3743, 3745, 3747, 3749, 3749, 3751, 3751, 3754, 3755, 3757, 3769, 3771, 3773, 3776, 3780, 3782, 3782, 3784, 3789, 3792, 3801, 3804, 3805, 3840, 3840, 3864, 3865, 3872, 3881, 3893, 3893, 3895, 3895, 3897, 3897, 3902, 3911, 3913, 3946, 3953, 3972, 3974, 3979, 3984, 3991, 3993, 4028, 4038, 4038, 4096, 4129, 4131, 4135, 4137, 4138, 4140, 4146, 4150, 4153, 4160, 4169, 4176, 4185, 4256, 4293, 4304, 4342, 4352, 4441, 4447, 4514, 4520, 4601, 4608, 4614, 4616, 4678, 4680, 4680, 4682, 4685, 4688, 4694, 4696, 4696, 4698, 4701, 4704, 4742, 4744, 4744, 4746, 4749, 4752, 4782, 4784, 4784, 4786, 4789, 4792, 4798, 4800, 4800, 4802, 4805, 4808, 4814, 4816, 4822, 4824, 4846, 4848, 4878, 4880, 4880, 4882, 4885, 4888, 4894, 4896, 4934, 4936, 4954, 4969, 4977, 5024, 5108, 5121, 5740, 5743, 5750, 5761, 5786, 5792, 5866, 6016, 6099, 6112, 6121, 6160, 6169, 6176, 6263, 6272, 6313, 7680, 7835, 7840, 7929, 7936, 7957, 7960, 7965, 7968, 8005, 8008, 8013, 8016, 8023, 8025, 8025, 8027, 8027, 8029, 8029, 8031, 8061, 8064, 8116, 8118, 8124, 8126, 8126, 8130, 8132, 8134, 8140, 8144, 8147, 8150, 8155, 8160, 8172, 8178, 8180, 8182, 8188, 8255, 8256, 8319, 8319, 8400, 8412, 8417, 8417, 8450, 8450, 8455, 8455, 8458, 8467, 8469, 8469, 8473, 8477, 8484, 8484, 8486, 8486, 8488, 8488, 8490, 8493, 8495, 8497, 8499, 8505, 8544, 8579, 12293, 12295, 12321, 12335, 12337, 12341, 12344, 12346, 12353, 12436, 12441, 12442, 12445, 12446, 12449, 12542, 12549, 12588, 12593, 12686, 12704, 12727, 13312, 19893, 19968, 40869, 40960, 42124, 44032, 55203, 63744, 64045, 64256, 64262, 64275, 64279, 64285, 64296, 64298, 64310, 64312, 64316, 64318, 64318, 64320, 64321, 64323, 64324, 64326, 64433, 64467, 64829, 64848, 64911, 64914, 64967, 65008, 65019, 65056, 65059, 65075, 65076, 65101, 65103, 65136, 65138, 65140, 65140, 65142, 65276, 65296, 65305, 65313, 65338, 65343, 65343, 65345, 65370, 65381, 65470, 65474, 65479, 65482, 65487, 65490, 65495, 65498, 65500,];
+    /*
+        As per ECMAScript Language Specification 5th Edition, Section 7.6: ISyntaxToken Names and Identifiers
+        IdentifierStart ::
+            Can contain Unicode 6.2 categories:
+            Uppercase letter (Lu),
+            Lowercase letter (Ll),
+            Titlecase letter (Lt),
+            Modifier letter (Lm),
+            Other letter (Lo), or
+            Letter number (Nl).
+        IdentifierPart ::
+            Can contain IdentifierStart + Unicode 6.2 categories:
+            Non-spacing mark (Mn),
+            Combining spacing mark (Mc),
+            Decimal number (Nd),
+            Connector punctuation (Pc),
+            <ZWNJ>, or
+            <ZWJ>.
+
+        Codepoint ranges for ES5 Identifiers are extracted from the Unicode 6.2 specification at:
+        http://www.unicode.org/Public/6.2.0/ucd/UnicodeData.txt
+    */
     var unicodeES5IdentifierStart = [170, 170, 181, 181, 186, 186, 192, 214, 216, 246, 248, 705, 710, 721, 736, 740, 748, 748, 750, 750, 880, 884, 886, 887, 890, 893, 902, 902, 904, 906, 908, 908, 910, 929, 931, 1013, 1015, 1153, 1162, 1319, 1329, 1366, 1369, 1369, 1377, 1415, 1488, 1514, 1520, 1522, 1568, 1610, 1646, 1647, 1649, 1747, 1749, 1749, 1765, 1766, 1774, 1775, 1786, 1788, 1791, 1791, 1808, 1808, 1810, 1839, 1869, 1957, 1969, 1969, 1994, 2026, 2036, 2037, 2042, 2042, 2048, 2069, 2074, 2074, 2084, 2084, 2088, 2088, 2112, 2136, 2208, 2208, 2210, 2220, 2308, 2361, 2365, 2365, 2384, 2384, 2392, 2401, 2417, 2423, 2425, 2431, 2437, 2444, 2447, 2448, 2451, 2472, 2474, 2480, 2482, 2482, 2486, 2489, 2493, 2493, 2510, 2510, 2524, 2525, 2527, 2529, 2544, 2545, 2565, 2570, 2575, 2576, 2579, 2600, 2602, 2608, 2610, 2611, 2613, 2614, 2616, 2617, 2649, 2652, 2654, 2654, 2674, 2676, 2693, 2701, 2703, 2705, 2707, 2728, 2730, 2736, 2738, 2739, 2741, 2745, 2749, 2749, 2768, 2768, 2784, 2785, 2821, 2828, 2831, 2832, 2835, 2856, 2858, 2864, 2866, 2867, 2869, 2873, 2877, 2877, 2908, 2909, 2911, 2913, 2929, 2929, 2947, 2947, 2949, 2954, 2958, 2960, 2962, 2965, 2969, 2970, 2972, 2972, 2974, 2975, 2979, 2980, 2984, 2986, 2990, 3001, 3024, 3024, 3077, 3084, 3086, 3088, 3090, 3112, 3114, 3123, 3125, 3129, 3133, 3133, 3160, 3161, 3168, 3169, 3205, 3212, 3214, 3216, 3218, 3240, 3242, 3251, 3253, 3257, 3261, 3261, 3294, 3294, 3296, 3297, 3313, 3314, 3333, 3340, 3342, 3344, 3346, 3386, 3389, 3389, 3406, 3406, 3424, 3425, 3450, 3455, 3461, 3478, 3482, 3505, 3507, 3515, 3517, 3517, 3520, 3526, 3585, 3632, 3634, 3635, 3648, 3654, 3713, 3714, 3716, 3716, 3719, 3720, 3722, 3722, 3725, 3725, 3732, 3735, 3737, 3743, 3745, 3747, 3749, 3749, 3751, 3751, 3754, 3755, 3757, 3760, 3762, 3763, 3773, 3773, 3776, 3780, 3782, 3782, 3804, 3807, 3840, 3840, 3904, 3911, 3913, 3948, 3976, 3980, 4096, 4138, 4159, 4159, 4176, 4181, 4186, 4189, 4193, 4193, 4197, 4198, 4206, 4208, 4213, 4225, 4238, 4238, 4256, 4293, 4295, 4295, 4301, 4301, 4304, 4346, 4348, 4680, 4682, 4685, 4688, 4694, 4696, 4696, 4698, 4701, 4704, 4744, 4746, 4749, 4752, 4784, 4786, 4789, 4792, 4798, 4800, 4800, 4802, 4805, 4808, 4822, 4824, 4880, 4882, 4885, 4888, 4954, 4992, 5007, 5024, 5108, 5121, 5740, 5743, 5759, 5761, 5786, 5792, 5866, 5870, 5872, 5888, 5900, 5902, 5905, 5920, 5937, 5952, 5969, 5984, 5996, 5998, 6000, 6016, 6067, 6103, 6103, 6108, 6108, 6176, 6263, 6272, 6312, 6314, 6314, 6320, 6389, 6400, 6428, 6480, 6509, 6512, 6516, 6528, 6571, 6593, 6599, 6656, 6678, 6688, 6740, 6823, 6823, 6917, 6963, 6981, 6987, 7043, 7072, 7086, 7087, 7098, 7141, 7168, 7203, 7245, 7247, 7258, 7293, 7401, 7404, 7406, 7409, 7413, 7414, 7424, 7615, 7680, 7957, 7960, 7965, 7968, 8005, 8008, 8013, 8016, 8023, 8025, 8025, 8027, 8027, 8029, 8029, 8031, 8061, 8064, 8116, 8118, 8124, 8126, 8126, 8130, 8132, 8134, 8140, 8144, 8147, 8150, 8155, 8160, 8172, 8178, 8180, 8182, 8188, 8305, 8305, 8319, 8319, 8336, 8348, 8450, 8450, 8455, 8455, 8458, 8467, 8469, 8469, 8473, 8477, 8484, 8484, 8486, 8486, 8488, 8488, 8490, 8493, 8495, 8505, 8508, 8511, 8517, 8521, 8526, 8526, 8544, 8584, 11264, 11310, 11312, 11358, 11360, 11492, 11499, 11502, 11506, 11507, 11520, 11557, 11559, 11559, 11565, 11565, 11568, 11623, 11631, 11631, 11648, 11670, 11680, 11686, 11688, 11694, 11696, 11702, 11704, 11710, 11712, 11718, 11720, 11726, 11728, 11734, 11736, 11742, 11823, 11823, 12293, 12295, 12321, 12329, 12337, 12341, 12344, 12348, 12353, 12438, 12445, 12447, 12449, 12538, 12540, 12543, 12549, 12589, 12593, 12686, 12704, 12730, 12784, 12799, 13312, 19893, 19968, 40908, 40960, 42124, 42192, 42237, 42240, 42508, 42512, 42527, 42538, 42539, 42560, 42606, 42623, 42647, 42656, 42735, 42775, 42783, 42786, 42888, 42891, 42894, 42896, 42899, 42912, 42922, 43000, 43009, 43011, 43013, 43015, 43018, 43020, 43042, 43072, 43123, 43138, 43187, 43250, 43255, 43259, 43259, 43274, 43301, 43312, 43334, 43360, 43388, 43396, 43442, 43471, 43471, 43520, 43560, 43584, 43586, 43588, 43595, 43616, 43638, 43642, 43642, 43648, 43695, 43697, 43697, 43701, 43702, 43705, 43709, 43712, 43712, 43714, 43714, 43739, 43741, 43744, 43754, 43762, 43764, 43777, 43782, 43785, 43790, 43793, 43798, 43808, 43814, 43816, 43822, 43968, 44002, 44032, 55203, 55216, 55238, 55243, 55291, 63744, 64109, 64112, 64217, 64256, 64262, 64275, 64279, 64285, 64285, 64287, 64296, 64298, 64310, 64312, 64316, 64318, 64318, 64320, 64321, 64323, 64324, 64326, 64433, 64467, 64829, 64848, 64911, 64914, 64967, 65008, 65019, 65136, 65140, 65142, 65276, 65313, 65338, 65345, 65370, 65382, 65470, 65474, 65479, 65482, 65487, 65490, 65495, 65498, 65500,];
     var unicodeES5IdentifierPart = [170, 170, 181, 181, 186, 186, 192, 214, 216, 246, 248, 705, 710, 721, 736, 740, 748, 748, 750, 750, 768, 884, 886, 887, 890, 893, 902, 902, 904, 906, 908, 908, 910, 929, 931, 1013, 1015, 1153, 1155, 1159, 1162, 1319, 1329, 1366, 1369, 1369, 1377, 1415, 1425, 1469, 1471, 1471, 1473, 1474, 1476, 1477, 1479, 1479, 1488, 1514, 1520, 1522, 1552, 1562, 1568, 1641, 1646, 1747, 1749, 1756, 1759, 1768, 1770, 1788, 1791, 1791, 1808, 1866, 1869, 1969, 1984, 2037, 2042, 2042, 2048, 2093, 2112, 2139, 2208, 2208, 2210, 2220, 2276, 2302, 2304, 2403, 2406, 2415, 2417, 2423, 2425, 2431, 2433, 2435, 2437, 2444, 2447, 2448, 2451, 2472, 2474, 2480, 2482, 2482, 2486, 2489, 2492, 2500, 2503, 2504, 2507, 2510, 2519, 2519, 2524, 2525, 2527, 2531, 2534, 2545, 2561, 2563, 2565, 2570, 2575, 2576, 2579, 2600, 2602, 2608, 2610, 2611, 2613, 2614, 2616, 2617, 2620, 2620, 2622, 2626, 2631, 2632, 2635, 2637, 2641, 2641, 2649, 2652, 2654, 2654, 2662, 2677, 2689, 2691, 2693, 2701, 2703, 2705, 2707, 2728, 2730, 2736, 2738, 2739, 2741, 2745, 2748, 2757, 2759, 2761, 2763, 2765, 2768, 2768, 2784, 2787, 2790, 2799, 2817, 2819, 2821, 2828, 2831, 2832, 2835, 2856, 2858, 2864, 2866, 2867, 2869, 2873, 2876, 2884, 2887, 2888, 2891, 2893, 2902, 2903, 2908, 2909, 2911, 2915, 2918, 2927, 2929, 2929, 2946, 2947, 2949, 2954, 2958, 2960, 2962, 2965, 2969, 2970, 2972, 2972, 2974, 2975, 2979, 2980, 2984, 2986, 2990, 3001, 3006, 3010, 3014, 3016, 3018, 3021, 3024, 3024, 3031, 3031, 3046, 3055, 3073, 3075, 3077, 3084, 3086, 3088, 3090, 3112, 3114, 3123, 3125, 3129, 3133, 3140, 3142, 3144, 3146, 3149, 3157, 3158, 3160, 3161, 3168, 3171, 3174, 3183, 3202, 3203, 3205, 3212, 3214, 3216, 3218, 3240, 3242, 3251, 3253, 3257, 3260, 3268, 3270, 3272, 3274, 3277, 3285, 3286, 3294, 3294, 3296, 3299, 3302, 3311, 3313, 3314, 3330, 3331, 3333, 3340, 3342, 3344, 3346, 3386, 3389, 3396, 3398, 3400, 3402, 3406, 3415, 3415, 3424, 3427, 3430, 3439, 3450, 3455, 3458, 3459, 3461, 3478, 3482, 3505, 3507, 3515, 3517, 3517, 3520, 3526, 3530, 3530, 3535, 3540, 3542, 3542, 3544, 3551, 3570, 3571, 3585, 3642, 3648, 3662, 3664, 3673, 3713, 3714, 3716, 3716, 3719, 3720, 3722, 3722, 3725, 3725, 3732, 3735, 3737, 3743, 3745, 3747, 3749, 3749, 3751, 3751, 3754, 3755, 3757, 3769, 3771, 3773, 3776, 3780, 3782, 3782, 3784, 3789, 3792, 3801, 3804, 3807, 3840, 3840, 3864, 3865, 3872, 3881, 3893, 3893, 3895, 3895, 3897, 3897, 3902, 3911, 3913, 3948, 3953, 3972, 3974, 3991, 3993, 4028, 4038, 4038, 4096, 4169, 4176, 4253, 4256, 4293, 4295, 4295, 4301, 4301, 4304, 4346, 4348, 4680, 4682, 4685, 4688, 4694, 4696, 4696, 4698, 4701, 4704, 4744, 4746, 4749, 4752, 4784, 4786, 4789, 4792, 4798, 4800, 4800, 4802, 4805, 4808, 4822, 4824, 4880, 4882, 4885, 4888, 4954, 4957, 4959, 4992, 5007, 5024, 5108, 5121, 5740, 5743, 5759, 5761, 5786, 5792, 5866, 5870, 5872, 5888, 5900, 5902, 5908, 5920, 5940, 5952, 5971, 5984, 5996, 5998, 6000, 6002, 6003, 6016, 6099, 6103, 6103, 6108, 6109, 6112, 6121, 6155, 6157, 6160, 6169, 6176, 6263, 6272, 6314, 6320, 6389, 6400, 6428, 6432, 6443, 6448, 6459, 6470, 6509, 6512, 6516, 6528, 6571, 6576, 6601, 6608, 6617, 6656, 6683, 6688, 6750, 6752, 6780, 6783, 6793, 6800, 6809, 6823, 6823, 6912, 6987, 6992, 7001, 7019, 7027, 7040, 7155, 7168, 7223, 7232, 7241, 7245, 7293, 7376, 7378, 7380, 7414, 7424, 7654, 7676, 7957, 7960, 7965, 7968, 8005, 8008, 8013, 8016, 8023, 8025, 8025, 8027, 8027, 8029, 8029, 8031, 8061, 8064, 8116, 8118, 8124, 8126, 8126, 8130, 8132, 8134, 8140, 8144, 8147, 8150, 8155, 8160, 8172, 8178, 8180, 8182, 8188, 8204, 8205, 8255, 8256, 8276, 8276, 8305, 8305, 8319, 8319, 8336, 8348, 8400, 8412, 8417, 8417, 8421, 8432, 8450, 8450, 8455, 8455, 8458, 8467, 8469, 8469, 8473, 8477, 8484, 8484, 8486, 8486, 8488, 8488, 8490, 8493, 8495, 8505, 8508, 8511, 8517, 8521, 8526, 8526, 8544, 8584, 11264, 11310, 11312, 11358, 11360, 11492, 11499, 11507, 11520, 11557, 11559, 11559, 11565, 11565, 11568, 11623, 11631, 11631, 11647, 11670, 11680, 11686, 11688, 11694, 11696, 11702, 11704, 11710, 11712, 11718, 11720, 11726, 11728, 11734, 11736, 11742, 11744, 11775, 11823, 11823, 12293, 12295, 12321, 12335, 12337, 12341, 12344, 12348, 12353, 12438, 12441, 12442, 12445, 12447, 12449, 12538, 12540, 12543, 12549, 12589, 12593, 12686, 12704, 12730, 12784, 12799, 13312, 19893, 19968, 40908, 40960, 42124, 42192, 42237, 42240, 42508, 42512, 42539, 42560, 42607, 42612, 42621, 42623, 42647, 42655, 42737, 42775, 42783, 42786, 42888, 42891, 42894, 42896, 42899, 42912, 42922, 43000, 43047, 43072, 43123, 43136, 43204, 43216, 43225, 43232, 43255, 43259, 43259, 43264, 43309, 43312, 43347, 43360, 43388, 43392, 43456, 43471, 43481, 43520, 43574, 43584, 43597, 43600, 43609, 43616, 43638, 43642, 43643, 43648, 43714, 43739, 43741, 43744, 43759, 43762, 43766, 43777, 43782, 43785, 43790, 43793, 43798, 43808, 43814, 43816, 43822, 43968, 44010, 44012, 44013, 44016, 44025, 44032, 55203, 55216, 55238, 55243, 55291, 63744, 64109, 64112, 64217, 64256, 64262, 64275, 64279, 64285, 64296, 64298, 64310, 64312, 64316, 64318, 64318, 64320, 64321, 64323, 64324, 64326, 64433, 64467, 64829, 64848, 64911, 64914, 64967, 65008, 65019, 65024, 65039, 65056, 65062, 65075, 65076, 65101, 65103, 65136, 65140, 65142, 65276, 65296, 65305, 65313, 65338, 65343, 65343, 65345, 65370, 65382, 65470, 65474, 65479, 65482, 65487, 65490, 65495, 65498, 65500,];
     function lookupInUnicodeMap(code, map) {
+        // Bail out quickly if it couldn't possibly be in the map.
         if (code < map[0]) {
             return false;
         }
+        // Perform binary search in one of the Unicode range maps
         var lo = 0;
         var hi = map.length;
         var mid;
         while (lo + 1 < hi) {
             mid = lo + (hi - lo) / 2;
+            // mid has to be even to catch a range's beginning
             mid -= mid % 2;
             if (map[mid] <= code && code <= map[mid + 1]) {
                 return true;
@@ -4908,14 +5771,14 @@ var ts;
         }
         return false;
     }
-    function isUnicodeIdentifierStart(code, languageVersion) {
-        return languageVersion >= 1 ?
+    /* @internal */ function isUnicodeIdentifierStart(code, languageVersion) {
+        return languageVersion >= 1 /* ES5 */ ?
             lookupInUnicodeMap(code, unicodeES5IdentifierStart) :
             lookupInUnicodeMap(code, unicodeES3IdentifierStart);
     }
     ts.isUnicodeIdentifierStart = isUnicodeIdentifierStart;
     function isUnicodeIdentifierPart(code, languageVersion) {
-        return languageVersion >= 1 ?
+        return languageVersion >= 1 /* ES5 */ ?
             lookupInUnicodeMap(code, unicodeES5IdentifierPart) :
             lookupInUnicodeMap(code, unicodeES3IdentifierPart);
     }
@@ -4931,10 +5794,12 @@ var ts;
         return tokenStrings[t];
     }
     ts.tokenToString = tokenToString;
+    /* @internal */
     function stringToToken(s) {
         return textToToken.get(s);
     }
     ts.stringToToken = stringToToken;
+    /* @internal */
     function computeLineStarts(text) {
         var result = new Array();
         var pos = 0;
@@ -4943,16 +5808,17 @@ var ts;
             var ch = text.charCodeAt(pos);
             pos++;
             switch (ch) {
-                case 13:
-                    if (text.charCodeAt(pos) === 10) {
+                case 13 /* carriageReturn */:
+                    if (text.charCodeAt(pos) === 10 /* lineFeed */) {
                         pos++;
                     }
-                case 10:
+                // falls through
+                case 10 /* lineFeed */:
                     result.push(lineStart);
                     lineStart = pos;
                     break;
                 default:
-                    if (ch > 127 && isLineBreak(ch)) {
+                    if (ch > 127 /* maxAsciiCharacter */ && isLineBreak(ch)) {
                         result.push(lineStart);
                         lineStart = pos;
                     }
@@ -4967,6 +5833,7 @@ var ts;
         return computePositionOfLineAndCharacter(getLineStarts(sourceFile), line, character, sourceFile.text);
     }
     ts.getPositionOfLineAndCharacter = getPositionOfLineAndCharacter;
+    /* @internal */
     function computePositionOfLineAndCharacter(lineStarts, line, character, debugText) {
         if (line < 0 || line >= lineStarts.length) {
             ts.Debug.fail("Bad line number. Line: " + line + ", lineStarts.length: " + lineStarts.length + " , line map is correct? " + (debugText !== undefined ? ts.arraysEqual(lineStarts, computeLineStarts(debugText)) : "unknown"));
@@ -4976,18 +5843,30 @@ var ts;
             ts.Debug.assert(res < lineStarts[line + 1]);
         }
         else if (debugText !== undefined) {
-            ts.Debug.assert(res <= debugText.length);
+            ts.Debug.assert(res <= debugText.length); // Allow single character overflow for trailing newline
         }
         return res;
     }
     ts.computePositionOfLineAndCharacter = computePositionOfLineAndCharacter;
+    /* @internal */
     function getLineStarts(sourceFile) {
         return sourceFile.lineMap || (sourceFile.lineMap = computeLineStarts(sourceFile.text));
     }
     ts.getLineStarts = getLineStarts;
+    /* @internal */
+    /**
+     * We assume the first line starts at position 0 and 'position' is non-negative.
+     */
     function computeLineAndCharacterOfPosition(lineStarts, position) {
         var lineNumber = ts.binarySearch(lineStarts, position, ts.identity, ts.compareValues);
         if (lineNumber < 0) {
+            // If the actual position was not found,
+            // the binary search returns the 2's-complement of the next line start
+            // e.g. if the line starts at [5, 10, 23, 80] and the position requested was 20
+            // then the search will return -2.
+            //
+            // We want the index of the previous line start, so we subtract 1.
+            // Review 2's-complement if this is confusing.
             lineNumber = ~lineNumber - 1;
             ts.Debug.assert(lineNumber !== -1, "position cannot precede the beginning of the file");
         }
@@ -5005,86 +5884,107 @@ var ts;
         return isWhiteSpaceSingleLine(ch) || isLineBreak(ch);
     }
     ts.isWhiteSpaceLike = isWhiteSpaceLike;
+    /** Does not include line breaks. For that, see isWhiteSpaceLike. */
     function isWhiteSpaceSingleLine(ch) {
-        return ch === 32 ||
-            ch === 9 ||
-            ch === 11 ||
-            ch === 12 ||
-            ch === 160 ||
-            ch === 133 ||
-            ch === 5760 ||
-            ch >= 8192 && ch <= 8203 ||
-            ch === 8239 ||
-            ch === 8287 ||
-            ch === 12288 ||
-            ch === 65279;
+        // Note: nextLine is in the Zs space, and should be considered to be a whitespace.
+        // It is explicitly not a line-break as it isn't in the exact set specified by EcmaScript.
+        return ch === 32 /* space */ ||
+            ch === 9 /* tab */ ||
+            ch === 11 /* verticalTab */ ||
+            ch === 12 /* formFeed */ ||
+            ch === 160 /* nonBreakingSpace */ ||
+            ch === 133 /* nextLine */ ||
+            ch === 5760 /* ogham */ ||
+            ch >= 8192 /* enQuad */ && ch <= 8203 /* zeroWidthSpace */ ||
+            ch === 8239 /* narrowNoBreakSpace */ ||
+            ch === 8287 /* mathematicalSpace */ ||
+            ch === 12288 /* ideographicSpace */ ||
+            ch === 65279 /* byteOrderMark */;
     }
     ts.isWhiteSpaceSingleLine = isWhiteSpaceSingleLine;
     function isLineBreak(ch) {
-        return ch === 10 ||
-            ch === 13 ||
-            ch === 8232 ||
-            ch === 8233;
+        // ES5 7.3:
+        // The ECMAScript line terminator characters are listed in Table 3.
+        //     Table 3: Line Terminator Characters
+        //     Code Unit Value     Name                    Formal Name
+        //     \u000A              Line Feed               <LF>
+        //     \u000D              Carriage Return         <CR>
+        //     \u2028              Line separator          <LS>
+        //     \u2029              Paragraph separator     <PS>
+        // Only the characters in Table 3 are treated as line terminators. Other new line or line
+        // breaking characters are treated as white space but not as line terminators.
+        return ch === 10 /* lineFeed */ ||
+            ch === 13 /* carriageReturn */ ||
+            ch === 8232 /* lineSeparator */ ||
+            ch === 8233 /* paragraphSeparator */;
     }
     ts.isLineBreak = isLineBreak;
     function isDigit(ch) {
-        return ch >= 48 && ch <= 57;
+        return ch >= 48 /* _0 */ && ch <= 57 /* _9 */;
     }
+    /* @internal */
     function isOctalDigit(ch) {
-        return ch >= 48 && ch <= 55;
+        return ch >= 48 /* _0 */ && ch <= 55 /* _7 */;
     }
     ts.isOctalDigit = isOctalDigit;
     function couldStartTrivia(text, pos) {
+        // Keep in sync with skipTrivia
         var ch = text.charCodeAt(pos);
         switch (ch) {
-            case 13:
-            case 10:
-            case 9:
-            case 11:
-            case 12:
-            case 32:
-            case 47:
-            case 60:
-            case 124:
-            case 61:
-            case 62:
+            case 13 /* carriageReturn */:
+            case 10 /* lineFeed */:
+            case 9 /* tab */:
+            case 11 /* verticalTab */:
+            case 12 /* formFeed */:
+            case 32 /* space */:
+            case 47 /* slash */:
+            // starts of normal trivia
+            case 60 /* lessThan */:
+            case 124 /* bar */:
+            case 61 /* equals */:
+            case 62 /* greaterThan */:
+                // Starts of conflict marker trivia
                 return true;
-            case 35:
+            case 35 /* hash */:
+                // Only if its the beginning can we have #! trivia
                 return pos === 0;
             default:
-                return ch > 127;
+                return ch > 127 /* maxAsciiCharacter */;
         }
     }
     ts.couldStartTrivia = couldStartTrivia;
+    /* @internal */
     function skipTrivia(text, pos, stopAfterLineBreak, stopAtComments) {
         if (stopAtComments === void 0) { stopAtComments = false; }
         if (ts.positionIsSynthesized(pos)) {
             return pos;
         }
+        // Keep in sync with couldStartTrivia
         while (true) {
             var ch = text.charCodeAt(pos);
             switch (ch) {
-                case 13:
-                    if (text.charCodeAt(pos + 1) === 10) {
+                case 13 /* carriageReturn */:
+                    if (text.charCodeAt(pos + 1) === 10 /* lineFeed */) {
                         pos++;
                     }
-                case 10:
+                // falls through
+                case 10 /* lineFeed */:
                     pos++;
                     if (stopAfterLineBreak) {
                         return pos;
                     }
                     continue;
-                case 9:
-                case 11:
-                case 12:
-                case 32:
+                case 9 /* tab */:
+                case 11 /* verticalTab */:
+                case 12 /* formFeed */:
+                case 32 /* space */:
                     pos++;
                     continue;
-                case 47:
+                case 47 /* slash */:
                     if (stopAtComments) {
                         break;
                     }
-                    if (text.charCodeAt(pos + 1) === 47) {
+                    if (text.charCodeAt(pos + 1) === 47 /* slash */) {
                         pos += 2;
                         while (pos < text.length) {
                             if (isLineBreak(text.charCodeAt(pos))) {
@@ -5094,10 +5994,10 @@ var ts;
                         }
                         continue;
                     }
-                    if (text.charCodeAt(pos + 1) === 42) {
+                    if (text.charCodeAt(pos + 1) === 42 /* asterisk */) {
                         pos += 2;
                         while (pos < text.length) {
-                            if (text.charCodeAt(pos) === 42 && text.charCodeAt(pos + 1) === 47) {
+                            if (text.charCodeAt(pos) === 42 /* asterisk */ && text.charCodeAt(pos + 1) === 47 /* slash */) {
                                 pos += 2;
                                 break;
                             }
@@ -5106,23 +6006,23 @@ var ts;
                         continue;
                     }
                     break;
-                case 60:
-                case 124:
-                case 61:
-                case 62:
+                case 60 /* lessThan */:
+                case 124 /* bar */:
+                case 61 /* equals */:
+                case 62 /* greaterThan */:
                     if (isConflictMarkerTrivia(text, pos)) {
                         pos = scanConflictMarkerTrivia(text, pos);
                         continue;
                     }
                     break;
-                case 35:
+                case 35 /* hash */:
                     if (pos === 0 && isShebangTrivia(text, pos)) {
                         pos = scanShebangTrivia(text, pos);
                         continue;
                     }
                     break;
                 default:
-                    if (ch > 127 && (isWhiteSpaceLike(ch))) {
+                    if (ch > 127 /* maxAsciiCharacter */ && (isWhiteSpaceLike(ch))) {
                         pos++;
                         continue;
                     }
@@ -5132,9 +6032,12 @@ var ts;
         }
     }
     ts.skipTrivia = skipTrivia;
+    // All conflict markers consist of the same character repeated seven times.  If it is
+    // a <<<<<<< or >>>>>>> marker then it is also followed by a space.
     var mergeConflictMarkerLength = "<<<<<<<".length;
     function isConflictMarkerTrivia(text, pos) {
         ts.Debug.assert(pos >= 0);
+        // Conflict markers must be at the start of a line.
         if (pos === 0 || isLineBreak(text.charCodeAt(pos - 1))) {
             var ch = text.charCodeAt(pos);
             if ((pos + mergeConflictMarkerLength) < text.length) {
@@ -5143,8 +6046,8 @@ var ts;
                         return false;
                     }
                 }
-                return ch === 61 ||
-                    text.charCodeAt(pos + mergeConflictMarkerLength) === 32;
+                return ch === 61 /* equals */ ||
+                    text.charCodeAt(pos + mergeConflictMarkerLength) === 32 /* space */;
             }
         }
         return false;
@@ -5155,16 +6058,18 @@ var ts;
         }
         var ch = text.charCodeAt(pos);
         var len = text.length;
-        if (ch === 60 || ch === 62) {
+        if (ch === 60 /* lessThan */ || ch === 62 /* greaterThan */) {
             while (pos < len && !isLineBreak(text.charCodeAt(pos))) {
                 pos++;
             }
         }
         else {
-            ts.Debug.assert(ch === 124 || ch === 61);
+            ts.Debug.assert(ch === 124 /* bar */ || ch === 61 /* equals */);
+            // Consume everything from the start of a ||||||| or ======= marker to the start
+            // of the next ======= or >>>>>>> marker.
             while (pos < len) {
                 var currentChar = text.charCodeAt(pos);
-                if ((currentChar === 61 || currentChar === 62) && currentChar !== ch && isConflictMarkerTrivia(text, pos)) {
+                if ((currentChar === 61 /* equals */ || currentChar === 62 /* greaterThan */) && currentChar !== ch && isConflictMarkerTrivia(text, pos)) {
                     break;
                 }
                 pos++;
@@ -5174,6 +6079,7 @@ var ts;
     }
     var shebangTriviaRegex = /^#!.*/;
     function isShebangTrivia(text, pos) {
+        // Shebangs check must only be done at the start of the file
         ts.Debug.assert(pos === 0);
         return shebangTriviaRegex.test(text);
     }
@@ -5182,6 +6088,26 @@ var ts;
         pos = pos + shebang.length;
         return pos;
     }
+    /**
+     * Invokes a callback for each comment range following the provided position.
+     *
+     * Single-line comment ranges include the leading double-slash characters but not the ending
+     * line break. Multi-line comment ranges include the leading slash-asterisk and trailing
+     * asterisk-slash characters.
+     *
+     * @param reduce If true, accumulates the result of calling the callback in a fashion similar
+     *      to reduceLeft. If false, iteration stops when the callback returns a truthy value.
+     * @param text The source text to scan.
+     * @param pos The position at which to start scanning.
+     * @param trailing If false, whitespace is skipped until the first line break and comments
+     *      between that location and the next token are returned. If true, comments occurring
+     *      between the given position and the next line break are returned.
+     * @param cb The callback to execute as each comment range is encountered.
+     * @param state A state value to pass to each iteration of the callback.
+     * @param initial An initial value to pass when accumulating results (when "reduce" is true).
+     * @returns If "reduce" is true, the accumulated value. If "reduce" is false, the first truthy
+     *      return value of the callback.
+     */
     function iterateCommentRanges(reduce, text, pos, trailing, cb, state, initial) {
         var pendingPos;
         var pendingEnd;
@@ -5193,11 +6119,12 @@ var ts;
         scan: while (pos >= 0 && pos < text.length) {
             var ch = text.charCodeAt(pos);
             switch (ch) {
-                case 13:
-                    if (text.charCodeAt(pos + 1) === 10) {
+                case 13 /* carriageReturn */:
+                    if (text.charCodeAt(pos + 1) === 10 /* lineFeed */) {
                         pos++;
                     }
-                case 10:
+                // falls through
+                case 10 /* lineFeed */:
                     pos++;
                     if (trailing) {
                         break scan;
@@ -5207,20 +6134,20 @@ var ts;
                         pendingHasTrailingNewLine = true;
                     }
                     continue;
-                case 9:
-                case 11:
-                case 12:
-                case 32:
+                case 9 /* tab */:
+                case 11 /* verticalTab */:
+                case 12 /* formFeed */:
+                case 32 /* space */:
                     pos++;
                     continue;
-                case 47:
+                case 47 /* slash */:
                     var nextChar = text.charCodeAt(pos + 1);
                     var hasTrailingNewLine = false;
-                    if (nextChar === 47 || nextChar === 42) {
-                        var kind = nextChar === 47 ? 2 : 3;
+                    if (nextChar === 47 /* slash */ || nextChar === 42 /* asterisk */) {
+                        var kind = nextChar === 47 /* slash */ ? 2 /* SingleLineCommentTrivia */ : 3 /* MultiLineCommentTrivia */;
                         var startPos = pos;
                         pos += 2;
-                        if (nextChar === 47) {
+                        if (nextChar === 47 /* slash */) {
                             while (pos < text.length) {
                                 if (isLineBreak(text.charCodeAt(pos))) {
                                     hasTrailingNewLine = true;
@@ -5231,7 +6158,7 @@ var ts;
                         }
                         else {
                             while (pos < text.length) {
-                                if (text.charCodeAt(pos) === 42 && text.charCodeAt(pos + 1) === 47) {
+                                if (text.charCodeAt(pos) === 42 /* asterisk */ && text.charCodeAt(pos + 1) === 47 /* slash */) {
                                     pos += 2;
                                     break;
                                 }
@@ -5242,6 +6169,7 @@ var ts;
                             if (hasPendingCommentRange) {
                                 accumulator = cb(pendingPos, pendingEnd, pendingKind, pendingHasTrailingNewLine, state, accumulator);
                                 if (!reduce && accumulator) {
+                                    // If we are not reducing and we have a truthy result, return it.
                                     return accumulator;
                                 }
                             }
@@ -5255,7 +6183,7 @@ var ts;
                     }
                     break scan;
                 default:
-                    if (ch > 127 && (isWhiteSpaceLike(ch))) {
+                    if (ch > 127 /* maxAsciiCharacter */ && (isWhiteSpaceLike(ch))) {
                         if (hasPendingCommentRange && isLineBreak(ch)) {
                             pendingHasTrailingNewLine = true;
                         }
@@ -5271,19 +6199,19 @@ var ts;
         return accumulator;
     }
     function forEachLeadingCommentRange(text, pos, cb, state) {
-        return iterateCommentRanges(false, text, pos, false, cb, state);
+        return iterateCommentRanges(/*reduce*/ false, text, pos, /*trailing*/ false, cb, state);
     }
     ts.forEachLeadingCommentRange = forEachLeadingCommentRange;
     function forEachTrailingCommentRange(text, pos, cb, state) {
-        return iterateCommentRanges(false, text, pos, true, cb, state);
+        return iterateCommentRanges(/*reduce*/ false, text, pos, /*trailing*/ true, cb, state);
     }
     ts.forEachTrailingCommentRange = forEachTrailingCommentRange;
     function reduceEachLeadingCommentRange(text, pos, cb, state, initial) {
-        return iterateCommentRanges(true, text, pos, false, cb, state, initial);
+        return iterateCommentRanges(/*reduce*/ true, text, pos, /*trailing*/ false, cb, state, initial);
     }
     ts.reduceEachLeadingCommentRange = reduceEachLeadingCommentRange;
     function reduceEachTrailingCommentRange(text, pos, cb, state, initial) {
-        return iterateCommentRanges(true, text, pos, true, cb, state, initial);
+        return iterateCommentRanges(/*reduce*/ true, text, pos, /*trailing*/ true, cb, state, initial);
     }
     ts.reduceEachTrailingCommentRange = reduceEachTrailingCommentRange;
     function appendCommentRange(pos, end, kind, hasTrailingNewLine, _state, comments) {
@@ -5294,13 +6222,14 @@ var ts;
         return comments;
     }
     function getLeadingCommentRanges(text, pos) {
-        return reduceEachLeadingCommentRange(text, pos, appendCommentRange, undefined, undefined);
+        return reduceEachLeadingCommentRange(text, pos, appendCommentRange, /*state*/ undefined, /*initial*/ undefined);
     }
     ts.getLeadingCommentRanges = getLeadingCommentRanges;
     function getTrailingCommentRanges(text, pos) {
-        return reduceEachTrailingCommentRange(text, pos, appendCommentRange, undefined, undefined);
+        return reduceEachTrailingCommentRange(text, pos, appendCommentRange, /*state*/ undefined, /*initial*/ undefined);
     }
     ts.getTrailingCommentRanges = getTrailingCommentRanges;
+    /** Optionally, get the shebang */
     function getShebang(text) {
         var match = shebangTriviaRegex.exec(text);
         if (match) {
@@ -5309,17 +6238,18 @@ var ts;
     }
     ts.getShebang = getShebang;
     function isIdentifierStart(ch, languageVersion) {
-        return ch >= 65 && ch <= 90 || ch >= 97 && ch <= 122 ||
-            ch === 36 || ch === 95 ||
-            ch > 127 && isUnicodeIdentifierStart(ch, languageVersion);
+        return ch >= 65 /* A */ && ch <= 90 /* Z */ || ch >= 97 /* a */ && ch <= 122 /* z */ ||
+            ch === 36 /* $ */ || ch === 95 /* _ */ ||
+            ch > 127 /* maxAsciiCharacter */ && isUnicodeIdentifierStart(ch, languageVersion);
     }
     ts.isIdentifierStart = isIdentifierStart;
     function isIdentifierPart(ch, languageVersion) {
-        return ch >= 65 && ch <= 90 || ch >= 97 && ch <= 122 ||
-            ch >= 48 && ch <= 57 || ch === 36 || ch === 95 ||
-            ch > 127 && isUnicodeIdentifierPart(ch, languageVersion);
+        return ch >= 65 /* A */ && ch <= 90 /* Z */ || ch >= 97 /* a */ && ch <= 122 /* z */ ||
+            ch >= 48 /* _0 */ && ch <= 57 /* _9 */ || ch === 36 /* $ */ || ch === 95 /* _ */ ||
+            ch > 127 /* maxAsciiCharacter */ && isUnicodeIdentifierPart(ch, languageVersion);
     }
     ts.isIdentifierPart = isIdentifierPart;
+    /* @internal */
     function isIdentifierText(name, languageVersion) {
         if (!isIdentifierStart(name.charCodeAt(0), languageVersion)) {
             return false;
@@ -5332,12 +6262,17 @@ var ts;
         return true;
     }
     ts.isIdentifierText = isIdentifierText;
+    // Creates a scanner over a (possibly unspecified) range of a piece of text.
     function createScanner(languageVersion, skipTrivia, languageVariant, textInitial, onError, start, length) {
-        if (languageVariant === void 0) { languageVariant = 0; }
+        if (languageVariant === void 0) { languageVariant = 0 /* Standard */; }
         var text = textInitial;
+        // Current position (end position of text of current token)
         var pos;
+        // end of text
         var end;
+        // Start position of whitespace before current token
         var startPos;
+        // Start position of text of current token
         var tokenPos;
         var token;
         var tokenValue;
@@ -5350,11 +6285,11 @@ var ts;
             getTokenPos: function () { return tokenPos; },
             getTokenText: function () { return text.substring(tokenPos, pos); },
             getTokenValue: function () { return tokenValue; },
-            hasExtendedUnicodeEscape: function () { return (tokenFlags & 8) !== 0; },
-            hasPrecedingLineBreak: function () { return (tokenFlags & 1) !== 0; },
-            isIdentifier: function () { return token === 71 || token > 107; },
-            isReservedWord: function () { return token >= 72 && token <= 107; },
-            isUnterminated: function () { return (tokenFlags & 4) !== 0; },
+            hasExtendedUnicodeEscape: function () { return (tokenFlags & 8 /* ExtendedUnicodeEscape */) !== 0; },
+            hasPrecedingLineBreak: function () { return (tokenFlags & 1 /* PrecedingLineBreak */) !== 0; },
+            isIdentifier: function () { return token === 71 /* Identifier */ || token > 107 /* LastReservedWord */; },
+            isReservedWord: function () { return token >= 72 /* FirstReservedWord */ && token <= 107 /* LastReservedWord */; },
+            isUnterminated: function () { return (tokenFlags & 4 /* Unterminated */) !== 0; },
             getTokenFlags: function () { return tokenFlags; },
             reScanGreaterToken: reScanGreaterToken,
             reScanSlashToken: reScanSlashToken,
@@ -5391,8 +6326,8 @@ var ts;
             var result = "";
             while (true) {
                 var ch = text.charCodeAt(pos);
-                if (ch === 95) {
-                    tokenFlags |= 512;
+                if (ch === 95 /* _ */) {
+                    tokenFlags |= 512 /* ContainsSeparator */;
                     if (allowSeparator) {
                         allowSeparator = false;
                         isPreviousTokenSeparator = true;
@@ -5416,7 +6351,7 @@ var ts;
                 }
                 break;
             }
-            if (text.charCodeAt(pos - 1) === 95) {
+            if (text.charCodeAt(pos - 1) === 95 /* _ */) {
                 error(ts.Diagnostics.Numeric_separators_are_not_allowed_here, pos - 1, 1);
             }
             return result + text.substring(start, pos);
@@ -5426,15 +6361,15 @@ var ts;
             var mainFragment = scanNumberFragment();
             var decimalFragment;
             var scientificFragment;
-            if (text.charCodeAt(pos) === 46) {
+            if (text.charCodeAt(pos) === 46 /* dot */) {
                 pos++;
                 decimalFragment = scanNumberFragment();
             }
             var end = pos;
-            if (text.charCodeAt(pos) === 69 || text.charCodeAt(pos) === 101) {
+            if (text.charCodeAt(pos) === 69 /* E */ || text.charCodeAt(pos) === 101 /* e */) {
                 pos++;
-                tokenFlags |= 16;
-                if (text.charCodeAt(pos) === 43 || text.charCodeAt(pos) === 45)
+                tokenFlags |= 16 /* Scientific */;
+                if (text.charCodeAt(pos) === 43 /* plus */ || text.charCodeAt(pos) === 45 /* minus */)
                     pos++;
                 var preNumericPart = pos;
                 var finalFragment = scanNumberFragment();
@@ -5446,7 +6381,7 @@ var ts;
                     end = pos;
                 }
             }
-            if (tokenFlags & 512) {
+            if (tokenFlags & 512 /* ContainsSeparator */) {
                 var result = mainFragment;
                 if (decimalFragment) {
                     result += "." + decimalFragment;
@@ -5457,7 +6392,7 @@ var ts;
                 return "" + +result;
             }
             else {
-                return "" + +(text.substring(start, end));
+                return "" + +(text.substring(start, end)); // No need to use all the fragments; no _ removal needed
             }
         }
         function scanOctalDigits() {
@@ -5467,11 +6402,19 @@ var ts;
             }
             return +(text.substring(start, pos));
         }
+        /**
+         * Scans the given number of hexadecimal digits in the text,
+         * returning -1 if the given number is unavailable.
+         */
         function scanExactNumberOfHexDigits(count, canHaveSeparators) {
-            return scanHexDigits(count, false, canHaveSeparators);
+            return scanHexDigits(/*minCount*/ count, /*scanAsManyAsPossible*/ false, canHaveSeparators);
         }
+        /**
+         * Scans as many hexadecimal digits as are available in the text,
+         * returning -1 if the given number of digits was unavailable.
+         */
         function scanMinimumNumberOfHexDigits(count, canHaveSeparators) {
-            return scanHexDigits(count, true, canHaveSeparators);
+            return scanHexDigits(/*minCount*/ count, /*scanAsManyAsPossible*/ true, canHaveSeparators);
         }
         function scanHexDigits(minCount, scanAsManyAsPossible, canHaveSeparators) {
             var digits = 0;
@@ -5480,8 +6423,8 @@ var ts;
             var isPreviousTokenSeparator = false;
             while (digits < minCount || scanAsManyAsPossible) {
                 var ch = text.charCodeAt(pos);
-                if (canHaveSeparators && ch === 95) {
-                    tokenFlags |= 512;
+                if (canHaveSeparators && ch === 95 /* _ */) {
+                    tokenFlags |= 512 /* ContainsSeparator */;
                     if (allowSeparator) {
                         allowSeparator = false;
                         isPreviousTokenSeparator = true;
@@ -5496,14 +6439,14 @@ var ts;
                     continue;
                 }
                 allowSeparator = canHaveSeparators;
-                if (ch >= 48 && ch <= 57) {
-                    value = value * 16 + ch - 48;
+                if (ch >= 48 /* _0 */ && ch <= 57 /* _9 */) {
+                    value = value * 16 + ch - 48 /* _0 */;
                 }
-                else if (ch >= 65 && ch <= 70) {
-                    value = value * 16 + ch - 65 + 10;
+                else if (ch >= 65 /* A */ && ch <= 70 /* F */) {
+                    value = value * 16 + ch - 65 /* A */ + 10;
                 }
-                else if (ch >= 97 && ch <= 102) {
-                    value = value * 16 + ch - 97 + 10;
+                else if (ch >= 97 /* a */ && ch <= 102 /* f */) {
+                    value = value * 16 + ch - 97 /* a */ + 10;
                 }
                 else {
                     break;
@@ -5515,7 +6458,7 @@ var ts;
             if (digits < minCount) {
                 value = -1;
             }
-            if (text.charCodeAt(pos - 1) === 95) {
+            if (text.charCodeAt(pos - 1) === 95 /* _ */) {
                 error(ts.Diagnostics.Numeric_separators_are_not_allowed_here, pos - 1, 1);
             }
             return value;
@@ -5529,7 +6472,7 @@ var ts;
             while (true) {
                 if (pos >= end) {
                     result += text.substring(start, pos);
-                    tokenFlags |= 4;
+                    tokenFlags |= 4 /* Unterminated */;
                     error(ts.Diagnostics.Unterminated_string_literal);
                     break;
                 }
@@ -5539,7 +6482,7 @@ var ts;
                     pos++;
                     break;
                 }
-                if (ch === 92 && !jsxAttributeString) {
+                if (ch === 92 /* backslash */ && !jsxAttributeString) {
                     result += text.substring(start, pos);
                     result += scanEscapeSequence();
                     start = pos;
@@ -5547,7 +6490,7 @@ var ts;
                 }
                 if (isLineBreak(ch) && !jsxAttributeString) {
                     result += text.substring(start, pos);
-                    tokenFlags |= 4;
+                    tokenFlags |= 4 /* Unterminated */;
                     error(ts.Diagnostics.Unterminated_string_literal);
                     break;
                 }
@@ -5555,8 +6498,12 @@ var ts;
             }
             return result;
         }
+        /**
+         * Sets the current 'tokenValue' and returns a NoSubstitutionTemplateLiteral or
+         * a literal component of a TemplateExpression.
+         */
         function scanTemplateAndSetTokenValue() {
-            var startedWithBacktick = text.charCodeAt(pos) === 96;
+            var startedWithBacktick = text.charCodeAt(pos) === 96 /* backtick */;
             pos++;
             var start = pos;
             var contents = "";
@@ -5564,34 +6511,39 @@ var ts;
             while (true) {
                 if (pos >= end) {
                     contents += text.substring(start, pos);
-                    tokenFlags |= 4;
+                    tokenFlags |= 4 /* Unterminated */;
                     error(ts.Diagnostics.Unterminated_template_literal);
-                    resultingToken = startedWithBacktick ? 13 : 16;
+                    resultingToken = startedWithBacktick ? 13 /* NoSubstitutionTemplateLiteral */ : 16 /* TemplateTail */;
                     break;
                 }
                 var currChar = text.charCodeAt(pos);
-                if (currChar === 96) {
+                // '`'
+                if (currChar === 96 /* backtick */) {
                     contents += text.substring(start, pos);
                     pos++;
-                    resultingToken = startedWithBacktick ? 13 : 16;
+                    resultingToken = startedWithBacktick ? 13 /* NoSubstitutionTemplateLiteral */ : 16 /* TemplateTail */;
                     break;
                 }
-                if (currChar === 36 && pos + 1 < end && text.charCodeAt(pos + 1) === 123) {
+                // '${'
+                if (currChar === 36 /* $ */ && pos + 1 < end && text.charCodeAt(pos + 1) === 123 /* openBrace */) {
                     contents += text.substring(start, pos);
                     pos += 2;
-                    resultingToken = startedWithBacktick ? 14 : 15;
+                    resultingToken = startedWithBacktick ? 14 /* TemplateHead */ : 15 /* TemplateMiddle */;
                     break;
                 }
-                if (currChar === 92) {
+                // Escape character
+                if (currChar === 92 /* backslash */) {
                     contents += text.substring(start, pos);
                     contents += scanEscapeSequence();
                     start = pos;
                     continue;
                 }
-                if (currChar === 13) {
+                // Speculated ECMAScript 6 Spec 11.8.6.1:
+                // <CR><LF> and <CR> LineTerminatorSequences are normalized to <LF> for Template Values
+                if (currChar === 13 /* carriageReturn */) {
                     contents += text.substring(start, pos);
                     pos++;
-                    if (pos < end && text.charCodeAt(pos) === 10) {
+                    if (pos < end && text.charCodeAt(pos) === 10 /* lineFeed */) {
                         pos++;
                     }
                     contents += "\n";
@@ -5613,47 +6565,53 @@ var ts;
             var ch = text.charCodeAt(pos);
             pos++;
             switch (ch) {
-                case 48:
+                case 48 /* _0 */:
                     return "\0";
-                case 98:
+                case 98 /* b */:
                     return "\b";
-                case 116:
+                case 116 /* t */:
                     return "\t";
-                case 110:
+                case 110 /* n */:
                     return "\n";
-                case 118:
+                case 118 /* v */:
                     return "\v";
-                case 102:
+                case 102 /* f */:
                     return "\f";
-                case 114:
+                case 114 /* r */:
                     return "\r";
-                case 39:
+                case 39 /* singleQuote */:
                     return "\'";
-                case 34:
+                case 34 /* doubleQuote */:
                     return "\"";
-                case 117:
-                    if (pos < end && text.charCodeAt(pos) === 123) {
-                        tokenFlags |= 8;
+                case 117 /* u */:
+                    // '\u{DDDDDDDD}'
+                    if (pos < end && text.charCodeAt(pos) === 123 /* openBrace */) {
+                        tokenFlags |= 8 /* ExtendedUnicodeEscape */;
                         pos++;
                         return scanExtendedUnicodeEscape();
                     }
-                    return scanHexadecimalEscape(4);
-                case 120:
-                    return scanHexadecimalEscape(2);
-                case 13:
-                    if (pos < end && text.charCodeAt(pos) === 10) {
+                    // '\uDDDD'
+                    return scanHexadecimalEscape(/*numDigits*/ 4);
+                case 120 /* x */:
+                    // '\xDD'
+                    return scanHexadecimalEscape(/*numDigits*/ 2);
+                // when encountering a LineContinuation (i.e. a backslash and a line terminator sequence),
+                // the line terminator is interpreted to be "the empty code unit sequence".
+                case 13 /* carriageReturn */:
+                    if (pos < end && text.charCodeAt(pos) === 10 /* lineFeed */) {
                         pos++;
                     }
-                case 10:
-                case 8232:
-                case 8233:
+                // falls through
+                case 10 /* lineFeed */:
+                case 8232 /* lineSeparator */:
+                case 8233 /* paragraphSeparator */:
                     return "";
                 default:
                     return String.fromCharCode(ch);
             }
         }
         function scanHexadecimalEscape(numDigits) {
-            var escapedValue = scanExactNumberOfHexDigits(numDigits, false);
+            var escapedValue = scanExactNumberOfHexDigits(numDigits, /*canHaveSeparators*/ false);
             if (escapedValue >= 0) {
                 return String.fromCharCode(escapedValue);
             }
@@ -5663,8 +6621,9 @@ var ts;
             }
         }
         function scanExtendedUnicodeEscape() {
-            var escapedValue = scanMinimumNumberOfHexDigits(1, false);
+            var escapedValue = scanMinimumNumberOfHexDigits(1, /*canHaveSeparators*/ false);
             var isInvalidExtendedEscape = false;
+            // Validate the value of the digit
             if (escapedValue < 0) {
                 error(ts.Diagnostics.Hexadecimal_digit_expected);
                 isInvalidExtendedEscape = true;
@@ -5677,7 +6636,8 @@ var ts;
                 error(ts.Diagnostics.Unexpected_end_of_text);
                 isInvalidExtendedEscape = true;
             }
-            else if (text.charCodeAt(pos) === 125) {
+            else if (text.charCodeAt(pos) === 125 /* closeBrace */) {
+                // Only swallow the following character up if it's a '}'.
                 pos++;
             }
             else {
@@ -5689,6 +6649,7 @@ var ts;
             }
             return utf16EncodeAsString(escapedValue);
         }
+        // Derived from the 10.1.1 UTF16Encoding of the ES6 Spec.
         function utf16EncodeAsString(codePoint) {
             ts.Debug.assert(0x0 <= codePoint && codePoint <= 0x10FFFF);
             if (codePoint <= 65535) {
@@ -5698,11 +6659,13 @@ var ts;
             var codeUnit2 = ((codePoint - 65536) % 1024) + 0xDC00;
             return String.fromCharCode(codeUnit1, codeUnit2);
         }
+        // Current character is known to be a backslash. Check for Unicode escape of the form '\uXXXX'
+        // and return code point value if valid Unicode escape is found. Otherwise return -1.
         function peekUnicodeEscape() {
-            if (pos + 5 < end && text.charCodeAt(pos + 1) === 117) {
+            if (pos + 5 < end && text.charCodeAt(pos + 1) === 117 /* u */) {
                 var start_1 = pos;
                 pos += 2;
-                var value = scanExactNumberOfHexDigits(4, false);
+                var value = scanExactNumberOfHexDigits(4, /*canHaveSeparators*/ false);
                 pos = start_1;
                 return value;
             }
@@ -5716,13 +6679,14 @@ var ts;
                 if (isIdentifierPart(ch, languageVersion)) {
                     pos++;
                 }
-                else if (ch === 92) {
+                else if (ch === 92 /* backslash */) {
                     ch = peekUnicodeEscape();
                     if (!(ch >= 0 && isIdentifierPart(ch, languageVersion))) {
                         break;
                     }
                     result += text.substring(start, pos);
                     result += String.fromCharCode(ch);
+                    // Valid Unicode escape is always six characters
                     pos += 6;
                     start = pos;
                 }
@@ -5734,28 +6698,32 @@ var ts;
             return result;
         }
         function getIdentifierToken() {
+            // Reserved words are between 2 and 11 characters long and start with a lowercase letter
             var len = tokenValue.length;
             if (len >= 2 && len <= 11) {
                 var ch = tokenValue.charCodeAt(0);
-                if (ch >= 97 && ch <= 122) {
+                if (ch >= 97 /* a */ && ch <= 122 /* z */) {
                     token = textToToken.get(tokenValue);
                     if (token !== undefined) {
                         return token;
                     }
                 }
             }
-            return token = 71;
+            return token = 71 /* Identifier */;
         }
         function scanBinaryOrOctalDigits(base) {
             ts.Debug.assert(base === 2 || base === 8, "Expected either base 2 or base 8");
             var value = 0;
+            // For counting number of digits; Valid binaryIntegerLiteral must have at least one binary digit following B or b.
+            // Similarly valid octalIntegerLiteral must have at least one octal digit following o or O.
             var numberOfDigits = 0;
             var separatorAllowed = false;
             var isPreviousTokenSeparator = false;
             while (true) {
                 var ch = text.charCodeAt(pos);
-                if (ch === 95) {
-                    tokenFlags |= 512;
+                // Numeric separators are allowed anywhere within a numeric literal, except not at the beginning, or following another separator
+                if (ch === 95 /* _ */) {
+                    tokenFlags |= 512 /* ContainsSeparator */;
                     if (separatorAllowed) {
                         separatorAllowed = false;
                         isPreviousTokenSeparator = true;
@@ -5770,7 +6738,7 @@ var ts;
                     continue;
                 }
                 separatorAllowed = true;
-                var valueOfCh = ch - 48;
+                var valueOfCh = ch - 48 /* _0 */;
                 if (!isDigit(ch) || valueOfCh >= base) {
                     break;
                 }
@@ -5779,10 +6747,12 @@ var ts;
                 numberOfDigits++;
                 isPreviousTokenSeparator = false;
             }
+            // Invalid binaryIntegerLiteral or octalIntegerLiteral
             if (numberOfDigits === 0) {
                 return -1;
             }
-            if (text.charCodeAt(pos - 1) === 95) {
+            if (text.charCodeAt(pos - 1) === 95 /* _ */) {
+                // Literal ends with underscore - not allowed
                 error(ts.Diagnostics.Numeric_separators_are_not_allowed_here, pos - 1, 1);
                 return value;
             }
@@ -5794,39 +6764,41 @@ var ts;
             while (true) {
                 tokenPos = pos;
                 if (pos >= end) {
-                    return token = 1;
+                    return token = 1 /* EndOfFileToken */;
                 }
                 var ch = text.charCodeAt(pos);
-                if (ch === 35 && pos === 0 && isShebangTrivia(text, pos)) {
+                // Special handling for shebang
+                if (ch === 35 /* hash */ && pos === 0 && isShebangTrivia(text, pos)) {
                     pos = scanShebangTrivia(text, pos);
                     if (skipTrivia) {
                         continue;
                     }
                     else {
-                        return token = 6;
+                        return token = 6 /* ShebangTrivia */;
                     }
                 }
                 switch (ch) {
-                    case 10:
-                    case 13:
-                        tokenFlags |= 1;
+                    case 10 /* lineFeed */:
+                    case 13 /* carriageReturn */:
+                        tokenFlags |= 1 /* PrecedingLineBreak */;
                         if (skipTrivia) {
                             pos++;
                             continue;
                         }
                         else {
-                            if (ch === 13 && pos + 1 < end && text.charCodeAt(pos + 1) === 10) {
+                            if (ch === 13 /* carriageReturn */ && pos + 1 < end && text.charCodeAt(pos + 1) === 10 /* lineFeed */) {
+                                // consume both CR and LF
                                 pos += 2;
                             }
                             else {
                                 pos++;
                             }
-                            return token = 4;
+                            return token = 4 /* NewLineTrivia */;
                         }
-                    case 9:
-                    case 11:
-                    case 12:
-                    case 32:
+                    case 9 /* tab */:
+                    case 11 /* verticalTab */:
+                    case 12 /* formFeed */:
+                    case 32 /* space */:
                         if (skipTrivia) {
                             pos++;
                             continue;
@@ -5835,89 +6807,90 @@ var ts;
                             while (pos < end && isWhiteSpaceSingleLine(text.charCodeAt(pos))) {
                                 pos++;
                             }
-                            return token = 5;
+                            return token = 5 /* WhitespaceTrivia */;
                         }
-                    case 33:
-                        if (text.charCodeAt(pos + 1) === 61) {
-                            if (text.charCodeAt(pos + 2) === 61) {
-                                return pos += 3, token = 35;
+                    case 33 /* exclamation */:
+                        if (text.charCodeAt(pos + 1) === 61 /* equals */) {
+                            if (text.charCodeAt(pos + 2) === 61 /* equals */) {
+                                return pos += 3, token = 35 /* ExclamationEqualsEqualsToken */;
                             }
-                            return pos += 2, token = 33;
+                            return pos += 2, token = 33 /* ExclamationEqualsToken */;
                         }
                         pos++;
-                        return token = 51;
-                    case 34:
-                    case 39:
+                        return token = 51 /* ExclamationToken */;
+                    case 34 /* doubleQuote */:
+                    case 39 /* singleQuote */:
                         tokenValue = scanString();
-                        return token = 9;
-                    case 96:
+                        return token = 9 /* StringLiteral */;
+                    case 96 /* backtick */:
                         return token = scanTemplateAndSetTokenValue();
-                    case 37:
-                        if (text.charCodeAt(pos + 1) === 61) {
-                            return pos += 2, token = 64;
+                    case 37 /* percent */:
+                        if (text.charCodeAt(pos + 1) === 61 /* equals */) {
+                            return pos += 2, token = 64 /* PercentEqualsToken */;
                         }
                         pos++;
-                        return token = 42;
-                    case 38:
-                        if (text.charCodeAt(pos + 1) === 38) {
-                            return pos += 2, token = 53;
+                        return token = 42 /* PercentToken */;
+                    case 38 /* ampersand */:
+                        if (text.charCodeAt(pos + 1) === 38 /* ampersand */) {
+                            return pos += 2, token = 53 /* AmpersandAmpersandToken */;
                         }
-                        if (text.charCodeAt(pos + 1) === 61) {
-                            return pos += 2, token = 68;
+                        if (text.charCodeAt(pos + 1) === 61 /* equals */) {
+                            return pos += 2, token = 68 /* AmpersandEqualsToken */;
                         }
                         pos++;
-                        return token = 48;
-                    case 40:
+                        return token = 48 /* AmpersandToken */;
+                    case 40 /* openParen */:
                         pos++;
-                        return token = 19;
-                    case 41:
+                        return token = 19 /* OpenParenToken */;
+                    case 41 /* closeParen */:
                         pos++;
-                        return token = 20;
-                    case 42:
-                        if (text.charCodeAt(pos + 1) === 61) {
-                            return pos += 2, token = 61;
+                        return token = 20 /* CloseParenToken */;
+                    case 42 /* asterisk */:
+                        if (text.charCodeAt(pos + 1) === 61 /* equals */) {
+                            return pos += 2, token = 61 /* AsteriskEqualsToken */;
                         }
-                        if (text.charCodeAt(pos + 1) === 42) {
-                            if (text.charCodeAt(pos + 2) === 61) {
-                                return pos += 3, token = 62;
+                        if (text.charCodeAt(pos + 1) === 42 /* asterisk */) {
+                            if (text.charCodeAt(pos + 2) === 61 /* equals */) {
+                                return pos += 3, token = 62 /* AsteriskAsteriskEqualsToken */;
                             }
-                            return pos += 2, token = 40;
+                            return pos += 2, token = 40 /* AsteriskAsteriskToken */;
                         }
                         pos++;
-                        return token = 39;
-                    case 43:
-                        if (text.charCodeAt(pos + 1) === 43) {
-                            return pos += 2, token = 43;
+                        return token = 39 /* AsteriskToken */;
+                    case 43 /* plus */:
+                        if (text.charCodeAt(pos + 1) === 43 /* plus */) {
+                            return pos += 2, token = 43 /* PlusPlusToken */;
                         }
-                        if (text.charCodeAt(pos + 1) === 61) {
-                            return pos += 2, token = 59;
+                        if (text.charCodeAt(pos + 1) === 61 /* equals */) {
+                            return pos += 2, token = 59 /* PlusEqualsToken */;
                         }
                         pos++;
-                        return token = 37;
-                    case 44:
+                        return token = 37 /* PlusToken */;
+                    case 44 /* comma */:
                         pos++;
-                        return token = 26;
-                    case 45:
-                        if (text.charCodeAt(pos + 1) === 45) {
-                            return pos += 2, token = 44;
+                        return token = 26 /* CommaToken */;
+                    case 45 /* minus */:
+                        if (text.charCodeAt(pos + 1) === 45 /* minus */) {
+                            return pos += 2, token = 44 /* MinusMinusToken */;
                         }
-                        if (text.charCodeAt(pos + 1) === 61) {
-                            return pos += 2, token = 60;
+                        if (text.charCodeAt(pos + 1) === 61 /* equals */) {
+                            return pos += 2, token = 60 /* MinusEqualsToken */;
                         }
                         pos++;
-                        return token = 38;
-                    case 46:
+                        return token = 38 /* MinusToken */;
+                    case 46 /* dot */:
                         if (isDigit(text.charCodeAt(pos + 1))) {
                             tokenValue = scanNumber();
-                            return token = 8;
+                            return token = 8 /* NumericLiteral */;
                         }
-                        if (text.charCodeAt(pos + 1) === 46 && text.charCodeAt(pos + 2) === 46) {
-                            return pos += 3, token = 24;
+                        if (text.charCodeAt(pos + 1) === 46 /* dot */ && text.charCodeAt(pos + 2) === 46 /* dot */) {
+                            return pos += 3, token = 24 /* DotDotDotToken */;
                         }
                         pos++;
-                        return token = 23;
-                    case 47:
-                        if (text.charCodeAt(pos + 1) === 47) {
+                        return token = 23 /* DotToken */;
+                    case 47 /* slash */:
+                        // Single-line comment
+                        if (text.charCodeAt(pos + 1) === 47 /* slash */) {
                             pos += 2;
                             while (pos < end) {
                                 if (isLineBreak(text.charCodeAt(pos))) {
@@ -5929,24 +6902,25 @@ var ts;
                                 continue;
                             }
                             else {
-                                return token = 2;
+                                return token = 2 /* SingleLineCommentTrivia */;
                             }
                         }
-                        if (text.charCodeAt(pos + 1) === 42) {
+                        // Multi-line comment
+                        if (text.charCodeAt(pos + 1) === 42 /* asterisk */) {
                             pos += 2;
-                            if (text.charCodeAt(pos) === 42 && text.charCodeAt(pos + 1) !== 47) {
-                                tokenFlags |= 2;
+                            if (text.charCodeAt(pos) === 42 /* asterisk */ && text.charCodeAt(pos + 1) !== 47 /* slash */) {
+                                tokenFlags |= 2 /* PrecedingJSDocComment */;
                             }
                             var commentClosed = false;
                             while (pos < end) {
                                 var ch_1 = text.charCodeAt(pos);
-                                if (ch_1 === 42 && text.charCodeAt(pos + 1) === 47) {
+                                if (ch_1 === 42 /* asterisk */ && text.charCodeAt(pos + 1) === 47 /* slash */) {
                                     pos += 2;
                                     commentClosed = true;
                                     break;
                                 }
                                 if (isLineBreak(ch_1)) {
-                                    tokenFlags |= 1;
+                                    tokenFlags |= 1 /* PrecedingLineBreak */;
                                 }
                                 pos++;
                             }
@@ -5958,177 +6932,182 @@ var ts;
                             }
                             else {
                                 if (!commentClosed) {
-                                    tokenFlags |= 4;
+                                    tokenFlags |= 4 /* Unterminated */;
                                 }
-                                return token = 3;
+                                return token = 3 /* MultiLineCommentTrivia */;
                             }
                         }
-                        if (text.charCodeAt(pos + 1) === 61) {
-                            return pos += 2, token = 63;
+                        if (text.charCodeAt(pos + 1) === 61 /* equals */) {
+                            return pos += 2, token = 63 /* SlashEqualsToken */;
                         }
                         pos++;
-                        return token = 41;
-                    case 48:
-                        if (pos + 2 < end && (text.charCodeAt(pos + 1) === 88 || text.charCodeAt(pos + 1) === 120)) {
+                        return token = 41 /* SlashToken */;
+                    case 48 /* _0 */:
+                        if (pos + 2 < end && (text.charCodeAt(pos + 1) === 88 /* X */ || text.charCodeAt(pos + 1) === 120 /* x */)) {
                             pos += 2;
-                            var value = scanMinimumNumberOfHexDigits(1, true);
+                            var value = scanMinimumNumberOfHexDigits(1, /*canHaveSeparators*/ true);
                             if (value < 0) {
                                 error(ts.Diagnostics.Hexadecimal_digit_expected);
                                 value = 0;
                             }
                             tokenValue = "" + value;
-                            tokenFlags |= 64;
-                            return token = 8;
+                            tokenFlags |= 64 /* HexSpecifier */;
+                            return token = 8 /* NumericLiteral */;
                         }
-                        else if (pos + 2 < end && (text.charCodeAt(pos + 1) === 66 || text.charCodeAt(pos + 1) === 98)) {
+                        else if (pos + 2 < end && (text.charCodeAt(pos + 1) === 66 /* B */ || text.charCodeAt(pos + 1) === 98 /* b */)) {
                             pos += 2;
-                            var value = scanBinaryOrOctalDigits(2);
+                            var value = scanBinaryOrOctalDigits(/* base */ 2);
                             if (value < 0) {
                                 error(ts.Diagnostics.Binary_digit_expected);
                                 value = 0;
                             }
                             tokenValue = "" + value;
-                            tokenFlags |= 128;
-                            return token = 8;
+                            tokenFlags |= 128 /* BinarySpecifier */;
+                            return token = 8 /* NumericLiteral */;
                         }
-                        else if (pos + 2 < end && (text.charCodeAt(pos + 1) === 79 || text.charCodeAt(pos + 1) === 111)) {
+                        else if (pos + 2 < end && (text.charCodeAt(pos + 1) === 79 /* O */ || text.charCodeAt(pos + 1) === 111 /* o */)) {
                             pos += 2;
-                            var value = scanBinaryOrOctalDigits(8);
+                            var value = scanBinaryOrOctalDigits(/* base */ 8);
                             if (value < 0) {
                                 error(ts.Diagnostics.Octal_digit_expected);
                                 value = 0;
                             }
                             tokenValue = "" + value;
-                            tokenFlags |= 256;
-                            return token = 8;
+                            tokenFlags |= 256 /* OctalSpecifier */;
+                            return token = 8 /* NumericLiteral */;
                         }
+                        // Try to parse as an octal
                         if (pos + 1 < end && isOctalDigit(text.charCodeAt(pos + 1))) {
                             tokenValue = "" + scanOctalDigits();
-                            tokenFlags |= 32;
-                            return token = 8;
+                            tokenFlags |= 32 /* Octal */;
+                            return token = 8 /* NumericLiteral */;
                         }
-                    case 49:
-                    case 50:
-                    case 51:
-                    case 52:
-                    case 53:
-                    case 54:
-                    case 55:
-                    case 56:
-                    case 57:
+                    // This fall-through is a deviation from the EcmaScript grammar. The grammar says that a leading zero
+                    // can only be followed by an octal digit, a dot, or the end of the number literal. However, we are being
+                    // permissive and allowing decimal digits of the form 08* and 09* (which many browsers also do).
+                    // falls through
+                    case 49 /* _1 */:
+                    case 50 /* _2 */:
+                    case 51 /* _3 */:
+                    case 52 /* _4 */:
+                    case 53 /* _5 */:
+                    case 54 /* _6 */:
+                    case 55 /* _7 */:
+                    case 56 /* _8 */:
+                    case 57 /* _9 */:
                         tokenValue = scanNumber();
-                        return token = 8;
-                    case 58:
+                        return token = 8 /* NumericLiteral */;
+                    case 58 /* colon */:
                         pos++;
-                        return token = 56;
-                    case 59:
+                        return token = 56 /* ColonToken */;
+                    case 59 /* semicolon */:
                         pos++;
-                        return token = 25;
-                    case 60:
+                        return token = 25 /* SemicolonToken */;
+                    case 60 /* lessThan */:
                         if (isConflictMarkerTrivia(text, pos)) {
                             pos = scanConflictMarkerTrivia(text, pos, error);
                             if (skipTrivia) {
                                 continue;
                             }
                             else {
-                                return token = 7;
+                                return token = 7 /* ConflictMarkerTrivia */;
                             }
                         }
-                        if (text.charCodeAt(pos + 1) === 60) {
-                            if (text.charCodeAt(pos + 2) === 61) {
-                                return pos += 3, token = 65;
+                        if (text.charCodeAt(pos + 1) === 60 /* lessThan */) {
+                            if (text.charCodeAt(pos + 2) === 61 /* equals */) {
+                                return pos += 3, token = 65 /* LessThanLessThanEqualsToken */;
                             }
-                            return pos += 2, token = 45;
+                            return pos += 2, token = 45 /* LessThanLessThanToken */;
                         }
-                        if (text.charCodeAt(pos + 1) === 61) {
-                            return pos += 2, token = 30;
+                        if (text.charCodeAt(pos + 1) === 61 /* equals */) {
+                            return pos += 2, token = 30 /* LessThanEqualsToken */;
                         }
-                        if (languageVariant === 1 &&
-                            text.charCodeAt(pos + 1) === 47 &&
-                            text.charCodeAt(pos + 2) !== 42) {
-                            return pos += 2, token = 28;
+                        if (languageVariant === 1 /* JSX */ &&
+                            text.charCodeAt(pos + 1) === 47 /* slash */ &&
+                            text.charCodeAt(pos + 2) !== 42 /* asterisk */) {
+                            return pos += 2, token = 28 /* LessThanSlashToken */;
                         }
                         pos++;
-                        return token = 27;
-                    case 61:
+                        return token = 27 /* LessThanToken */;
+                    case 61 /* equals */:
                         if (isConflictMarkerTrivia(text, pos)) {
                             pos = scanConflictMarkerTrivia(text, pos, error);
                             if (skipTrivia) {
                                 continue;
                             }
                             else {
-                                return token = 7;
+                                return token = 7 /* ConflictMarkerTrivia */;
                             }
                         }
-                        if (text.charCodeAt(pos + 1) === 61) {
-                            if (text.charCodeAt(pos + 2) === 61) {
-                                return pos += 3, token = 34;
+                        if (text.charCodeAt(pos + 1) === 61 /* equals */) {
+                            if (text.charCodeAt(pos + 2) === 61 /* equals */) {
+                                return pos += 3, token = 34 /* EqualsEqualsEqualsToken */;
                             }
-                            return pos += 2, token = 32;
+                            return pos += 2, token = 32 /* EqualsEqualsToken */;
                         }
-                        if (text.charCodeAt(pos + 1) === 62) {
-                            return pos += 2, token = 36;
+                        if (text.charCodeAt(pos + 1) === 62 /* greaterThan */) {
+                            return pos += 2, token = 36 /* EqualsGreaterThanToken */;
                         }
                         pos++;
-                        return token = 58;
-                    case 62:
+                        return token = 58 /* EqualsToken */;
+                    case 62 /* greaterThan */:
                         if (isConflictMarkerTrivia(text, pos)) {
                             pos = scanConflictMarkerTrivia(text, pos, error);
                             if (skipTrivia) {
                                 continue;
                             }
                             else {
-                                return token = 7;
+                                return token = 7 /* ConflictMarkerTrivia */;
                             }
                         }
                         pos++;
-                        return token = 29;
-                    case 63:
+                        return token = 29 /* GreaterThanToken */;
+                    case 63 /* question */:
                         pos++;
-                        return token = 55;
-                    case 91:
+                        return token = 55 /* QuestionToken */;
+                    case 91 /* openBracket */:
                         pos++;
-                        return token = 21;
-                    case 93:
+                        return token = 21 /* OpenBracketToken */;
+                    case 93 /* closeBracket */:
                         pos++;
-                        return token = 22;
-                    case 94:
-                        if (text.charCodeAt(pos + 1) === 61) {
-                            return pos += 2, token = 70;
+                        return token = 22 /* CloseBracketToken */;
+                    case 94 /* caret */:
+                        if (text.charCodeAt(pos + 1) === 61 /* equals */) {
+                            return pos += 2, token = 70 /* CaretEqualsToken */;
                         }
                         pos++;
-                        return token = 50;
-                    case 123:
+                        return token = 50 /* CaretToken */;
+                    case 123 /* openBrace */:
                         pos++;
-                        return token = 17;
-                    case 124:
+                        return token = 17 /* OpenBraceToken */;
+                    case 124 /* bar */:
                         if (isConflictMarkerTrivia(text, pos)) {
                             pos = scanConflictMarkerTrivia(text, pos, error);
                             if (skipTrivia) {
                                 continue;
                             }
                             else {
-                                return token = 7;
+                                return token = 7 /* ConflictMarkerTrivia */;
                             }
                         }
-                        if (text.charCodeAt(pos + 1) === 124) {
-                            return pos += 2, token = 54;
+                        if (text.charCodeAt(pos + 1) === 124 /* bar */) {
+                            return pos += 2, token = 54 /* BarBarToken */;
                         }
-                        if (text.charCodeAt(pos + 1) === 61) {
-                            return pos += 2, token = 69;
+                        if (text.charCodeAt(pos + 1) === 61 /* equals */) {
+                            return pos += 2, token = 69 /* BarEqualsToken */;
                         }
                         pos++;
-                        return token = 49;
-                    case 125:
+                        return token = 49 /* BarToken */;
+                    case 125 /* closeBrace */:
                         pos++;
-                        return token = 18;
-                    case 126:
+                        return token = 18 /* CloseBraceToken */;
+                    case 126 /* tilde */:
                         pos++;
-                        return token = 52;
-                    case 64:
+                        return token = 52 /* TildeToken */;
+                    case 64 /* at */:
                         pos++;
-                        return token = 57;
-                    case 92:
+                        return token = 57 /* AtToken */;
+                    case 92 /* backslash */:
                         var cookedChar = peekUnicodeEscape();
                         if (cookedChar >= 0 && isIdentifierStart(cookedChar, languageVersion)) {
                             pos += 6;
@@ -6137,14 +7116,14 @@ var ts;
                         }
                         error(ts.Diagnostics.Invalid_character);
                         pos++;
-                        return token = 0;
+                        return token = 0 /* Unknown */;
                     default:
                         if (isIdentifierStart(ch, languageVersion)) {
                             pos++;
                             while (pos < end && isIdentifierPart(ch = text.charCodeAt(pos), languageVersion))
                                 pos++;
                             tokenValue = text.substring(tokenPos, pos);
-                            if (ch === 92) {
+                            if (ch === 92 /* backslash */) {
                                 tokenValue += scanIdentifierParts();
                             }
                             return token = getIdentifierToken();
@@ -6154,69 +7133,75 @@ var ts;
                             continue;
                         }
                         else if (isLineBreak(ch)) {
-                            tokenFlags |= 1;
+                            tokenFlags |= 1 /* PrecedingLineBreak */;
                             pos++;
                             continue;
                         }
                         error(ts.Diagnostics.Invalid_character);
                         pos++;
-                        return token = 0;
+                        return token = 0 /* Unknown */;
                 }
             }
         }
         function reScanGreaterToken() {
-            if (token === 29) {
-                if (text.charCodeAt(pos) === 62) {
-                    if (text.charCodeAt(pos + 1) === 62) {
-                        if (text.charCodeAt(pos + 2) === 61) {
-                            return pos += 3, token = 67;
+            if (token === 29 /* GreaterThanToken */) {
+                if (text.charCodeAt(pos) === 62 /* greaterThan */) {
+                    if (text.charCodeAt(pos + 1) === 62 /* greaterThan */) {
+                        if (text.charCodeAt(pos + 2) === 61 /* equals */) {
+                            return pos += 3, token = 67 /* GreaterThanGreaterThanGreaterThanEqualsToken */;
                         }
-                        return pos += 2, token = 47;
+                        return pos += 2, token = 47 /* GreaterThanGreaterThanGreaterThanToken */;
                     }
-                    if (text.charCodeAt(pos + 1) === 61) {
-                        return pos += 2, token = 66;
+                    if (text.charCodeAt(pos + 1) === 61 /* equals */) {
+                        return pos += 2, token = 66 /* GreaterThanGreaterThanEqualsToken */;
                     }
                     pos++;
-                    return token = 46;
+                    return token = 46 /* GreaterThanGreaterThanToken */;
                 }
-                if (text.charCodeAt(pos) === 61) {
+                if (text.charCodeAt(pos) === 61 /* equals */) {
                     pos++;
-                    return token = 31;
+                    return token = 31 /* GreaterThanEqualsToken */;
                 }
             }
             return token;
         }
         function reScanSlashToken() {
-            if (token === 41 || token === 63) {
+            if (token === 41 /* SlashToken */ || token === 63 /* SlashEqualsToken */) {
                 var p = tokenPos + 1;
                 var inEscape = false;
                 var inCharacterClass = false;
                 while (true) {
+                    // If we reach the end of a file, or hit a newline, then this is an unterminated
+                    // regex.  Report error and return what we have so far.
                     if (p >= end) {
-                        tokenFlags |= 4;
+                        tokenFlags |= 4 /* Unterminated */;
                         error(ts.Diagnostics.Unterminated_regular_expression_literal);
                         break;
                     }
                     var ch = text.charCodeAt(p);
                     if (isLineBreak(ch)) {
-                        tokenFlags |= 4;
+                        tokenFlags |= 4 /* Unterminated */;
                         error(ts.Diagnostics.Unterminated_regular_expression_literal);
                         break;
                     }
                     if (inEscape) {
+                        // Parsing an escape character;
+                        // reset the flag and just advance to the next char.
                         inEscape = false;
                     }
-                    else if (ch === 47 && !inCharacterClass) {
+                    else if (ch === 47 /* slash */ && !inCharacterClass) {
+                        // A slash within a character class is permissible,
+                        // but in general it signals the end of the regexp literal.
                         p++;
                         break;
                     }
-                    else if (ch === 91) {
+                    else if (ch === 91 /* openBracket */) {
                         inCharacterClass = true;
                     }
-                    else if (ch === 92) {
+                    else if (ch === 92 /* backslash */) {
                         inEscape = true;
                     }
-                    else if (ch === 93) {
+                    else if (ch === 93 /* closeBracket */) {
                         inCharacterClass = false;
                     }
                     p++;
@@ -6226,12 +7211,15 @@ var ts;
                 }
                 pos = p;
                 tokenValue = text.substring(tokenPos, pos);
-                token = 12;
+                token = 12 /* RegularExpressionLiteral */;
             }
             return token;
         }
+        /**
+         * Unconditionally back up and scan a template expression portion.
+         */
         function reScanTemplateToken() {
-            ts.Debug.assert(token === 18, "'reScanTemplateToken' should only be called on a '}'");
+            ts.Debug.assert(token === 18 /* CloseBraceToken */, "'reScanTemplateToken' should only be called on a '}'");
             pos = tokenPos;
             return token = scanTemplateAndSetTokenValue();
         }
@@ -6242,34 +7230,43 @@ var ts;
         function scanJsxToken() {
             startPos = tokenPos = pos;
             if (pos >= end) {
-                return token = 1;
+                return token = 1 /* EndOfFileToken */;
             }
             var char = text.charCodeAt(pos);
-            if (char === 60) {
-                if (text.charCodeAt(pos + 1) === 47) {
+            if (char === 60 /* lessThan */) {
+                if (text.charCodeAt(pos + 1) === 47 /* slash */) {
                     pos += 2;
-                    return token = 28;
+                    return token = 28 /* LessThanSlashToken */;
                 }
                 pos++;
-                return token = 27;
+                return token = 27 /* LessThanToken */;
             }
-            if (char === 123) {
+            if (char === 123 /* openBrace */) {
                 pos++;
-                return token = 17;
+                return token = 17 /* OpenBraceToken */;
             }
+            // First non-whitespace character on this line.
             var firstNonWhitespace = 0;
+            // These initial values are special because the first line is:
+            // firstNonWhitespace = 0 to indicate that we want leading whitspace,
             while (pos < end) {
                 char = text.charCodeAt(pos);
-                if (char === 123) {
+                if (char === 123 /* openBrace */) {
                     break;
                 }
-                if (char === 60) {
+                if (char === 60 /* lessThan */) {
                     if (isConflictMarkerTrivia(text, pos)) {
                         pos = scanConflictMarkerTrivia(text, pos, error);
-                        return token = 7;
+                        return token = 7 /* ConflictMarkerTrivia */;
                     }
                     break;
                 }
+                // FirstNonWhitespace is 0, then we only see whitespaces so far. If we see a linebreak, we want to ignore that whitespaces.
+                // i.e (- : whitespace)
+                //      <div>----
+                //      </div> becomes <div></div>
+                //
+                //      <div>----</div> becomes <div>----</div>
                 if (isLineBreak(char) && firstNonWhitespace === 0) {
                     firstNonWhitespace = -1;
                 }
@@ -6278,14 +7275,16 @@ var ts;
                 }
                 pos++;
             }
-            return firstNonWhitespace === -1 ? 11 : 10;
+            return firstNonWhitespace === -1 ? 11 /* JsxTextAllWhiteSpaces */ : 10 /* JsxText */;
         }
+        // Scans a JSX identifier; these differ from normal identifiers in that
+        // they allow dashes
         function scanJsxIdentifier() {
             if (tokenIsIdentifierOrKeyword(token)) {
                 var firstCharPosition = pos;
                 while (pos < end) {
                     var ch = text.charCodeAt(pos);
-                    if (ch === 45 || ((firstCharPosition === pos) ? isIdentifierStart(ch, languageVersion) : isIdentifierPart(ch, languageVersion))) {
+                    if (ch === 45 /* minus */ || ((firstCharPosition === pos) ? isIdentifierStart(ch, languageVersion) : isIdentifierPart(ch, languageVersion))) {
                         pos++;
                     }
                     else {
@@ -6299,70 +7298,71 @@ var ts;
         function scanJsxAttributeValue() {
             startPos = pos;
             switch (text.charCodeAt(pos)) {
-                case 34:
-                case 39:
-                    tokenValue = scanString(true);
-                    return token = 9;
+                case 34 /* doubleQuote */:
+                case 39 /* singleQuote */:
+                    tokenValue = scanString(/*jsxAttributeString*/ true);
+                    return token = 9 /* StringLiteral */;
                 default:
+                    // If this scans anything other than `{`, it's a parse error.
                     return scan();
             }
         }
         function scanJSDocToken() {
             startPos = tokenPos = pos;
             if (pos >= end) {
-                return token = 1;
+                return token = 1 /* EndOfFileToken */;
             }
             var ch = text.charCodeAt(pos);
             pos++;
             switch (ch) {
-                case 9:
-                case 11:
-                case 12:
-                case 32:
+                case 9 /* tab */:
+                case 11 /* verticalTab */:
+                case 12 /* formFeed */:
+                case 32 /* space */:
                     while (pos < end && isWhiteSpaceSingleLine(text.charCodeAt(pos))) {
                         pos++;
                     }
-                    return token = 5;
-                case 64:
-                    return token = 57;
-                case 10:
-                case 13:
-                    return token = 4;
-                case 42:
-                    return token = 39;
-                case 123:
-                    return token = 17;
-                case 125:
-                    return token = 18;
-                case 91:
-                    return token = 21;
-                case 93:
-                    return token = 22;
-                case 60:
-                    return token = 27;
-                case 61:
-                    return token = 58;
-                case 44:
-                    return token = 26;
-                case 46:
-                    return token = 23;
-                case 96:
-                    while (pos < end && text.charCodeAt(pos) !== 96) {
+                    return token = 5 /* WhitespaceTrivia */;
+                case 64 /* at */:
+                    return token = 57 /* AtToken */;
+                case 10 /* lineFeed */:
+                case 13 /* carriageReturn */:
+                    return token = 4 /* NewLineTrivia */;
+                case 42 /* asterisk */:
+                    return token = 39 /* AsteriskToken */;
+                case 123 /* openBrace */:
+                    return token = 17 /* OpenBraceToken */;
+                case 125 /* closeBrace */:
+                    return token = 18 /* CloseBraceToken */;
+                case 91 /* openBracket */:
+                    return token = 21 /* OpenBracketToken */;
+                case 93 /* closeBracket */:
+                    return token = 22 /* CloseBracketToken */;
+                case 60 /* lessThan */:
+                    return token = 27 /* LessThanToken */;
+                case 61 /* equals */:
+                    return token = 58 /* EqualsToken */;
+                case 44 /* comma */:
+                    return token = 26 /* CommaToken */;
+                case 46 /* dot */:
+                    return token = 23 /* DotToken */;
+                case 96 /* backtick */:
+                    while (pos < end && text.charCodeAt(pos) !== 96 /* backtick */) {
                         pos++;
                     }
                     tokenValue = text.substring(tokenPos + 1, pos);
                     pos++;
-                    return token = 13;
+                    return token = 13 /* NoSubstitutionTemplateLiteral */;
             }
-            if (isIdentifierStart(ch, 6)) {
-                while (isIdentifierPart(text.charCodeAt(pos), 6) && pos < end) {
+            if (isIdentifierStart(ch, 6 /* Latest */)) {
+                while (isIdentifierPart(text.charCodeAt(pos), 6 /* Latest */) && pos < end) {
                     pos++;
                 }
                 tokenValue = text.substring(tokenPos, pos);
-                return token = 71;
+                return token = 71 /* Identifier */;
             }
             else {
-                return token = 0;
+                return token = 0 /* Unknown */;
             }
         }
         function speculationHelper(callback, isLookahead) {
@@ -6373,6 +7373,8 @@ var ts;
             var saveTokenValue = tokenValue;
             var saveTokenFlags = tokenFlags;
             var result = callback();
+            // If our callback returned something 'falsy' or we're just looking ahead,
+            // then unconditionally restore us to where we were.
             if (!result || isLookahead) {
                 pos = savePos;
                 startPos = saveStartPos;
@@ -6403,10 +7405,10 @@ var ts;
             return result;
         }
         function lookAhead(callback) {
-            return speculationHelper(callback, true);
+            return speculationHelper(callback, /*isLookahead*/ true);
         }
         function tryScan(callback) {
-            return speculationHelper(callback, false);
+            return speculationHelper(callback, /*isLookahead*/ false);
         }
         function getText() {
             return text;
@@ -6430,14 +7432,45 @@ var ts;
             pos = textPos;
             startPos = textPos;
             tokenPos = textPos;
-            token = 0;
+            token = 0 /* Unknown */;
             tokenValue = undefined;
             tokenFlags = 0;
         }
     }
     ts.createScanner = createScanner;
 })(ts || (ts = {}));
+/** Non-internal stuff goes here */
 var ts;
+(function (ts) {
+    ts.emptyArray = [];
+    function closeFileWatcher(watcher) {
+        watcher.close();
+    }
+    ts.closeFileWatcher = closeFileWatcher;
+    function isExternalModuleNameRelative(moduleName) {
+        // TypeScript 1.0 spec (April 2014): 11.2.1
+        // An external module name is "relative" if the first term is "." or "..".
+        // Update: We also consider a path like `C:\foo.ts` "relative" because we do not search for it in `node_modules` or treat it as an ambient module.
+        return ts.pathIsRelative(moduleName) || ts.isRootedDiskPath(moduleName);
+    }
+    ts.isExternalModuleNameRelative = isExternalModuleNameRelative;
+    function sortAndDeduplicateDiagnostics(diagnostics) {
+        return ts.sortAndDeduplicate(diagnostics, ts.compareDiagnostics);
+    }
+    ts.sortAndDeduplicateDiagnostics = sortAndDeduplicateDiagnostics;
+    function toPath(fileName, basePath, getCanonicalFileName) {
+        var nonCanonicalizedPath = ts.isRootedDiskPath(fileName)
+            ? ts.normalizePath(fileName)
+            : ts.getNormalizedAbsolutePath(fileName, basePath);
+        return getCanonicalFileName(nonCanonicalizedPath);
+    }
+    ts.toPath = toPath;
+    function hasEntries(map) {
+        return !!map && !!map.size;
+    }
+    ts.hasEntries = hasEntries;
+})(ts || (ts = {}));
+/* @internal */
 (function (ts) {
     ts.resolvingEmptyArray = [];
     ts.emptyMap = ts.createMap();
@@ -6456,6 +7489,22 @@ var ts;
         return undefined;
     }
     ts.getDeclarationOfKind = getDeclarationOfKind;
+    /** Create a new escaped identifier map. */
+    function createUnderscoreEscapedMap() {
+        return new ts.MapCtr();
+    }
+    ts.createUnderscoreEscapedMap = createUnderscoreEscapedMap;
+    function createSymbolTable(symbols) {
+        var result = ts.createMap();
+        if (symbols) {
+            for (var _i = 0, symbols_1 = symbols; _i < symbols_1.length; _i++) {
+                var symbol = symbols_1[_i];
+                result.set(symbol.escapedName, symbol);
+            }
+        }
+        return result;
+    }
+    ts.createSymbolTable = createSymbolTable;
     var stringWriter = createSingleLineStringWriter();
     function createSingleLineStringWriter() {
         var str = "";
@@ -6479,6 +7528,8 @@ var ts;
             getColumn: function () { return 0; },
             getIndent: function () { return 0; },
             isAtStartOfLine: function () { return false; },
+            // Completely ignore indentation for string writers.  And map newlines to
+            // a single space.
             writeLine: function () { return str += " "; },
             increaseIndent: ts.noop,
             decreaseIndent: ts.noop,
@@ -6489,6 +7540,80 @@ var ts;
             reportPrivateInBaseOfClassExpression: ts.noop,
         };
     }
+    function changesAffectModuleResolution(oldOptions, newOptions) {
+        return !oldOptions ||
+            (oldOptions.module !== newOptions.module) ||
+            (oldOptions.moduleResolution !== newOptions.moduleResolution) ||
+            (oldOptions.noResolve !== newOptions.noResolve) ||
+            (oldOptions.target !== newOptions.target) ||
+            (oldOptions.noLib !== newOptions.noLib) ||
+            (oldOptions.jsx !== newOptions.jsx) ||
+            (oldOptions.allowJs !== newOptions.allowJs) ||
+            (oldOptions.rootDir !== newOptions.rootDir) ||
+            (oldOptions.configFilePath !== newOptions.configFilePath) ||
+            (oldOptions.baseUrl !== newOptions.baseUrl) ||
+            (oldOptions.maxNodeModuleJsDepth !== newOptions.maxNodeModuleJsDepth) ||
+            !ts.arrayIsEqualTo(oldOptions.lib, newOptions.lib) ||
+            !ts.arrayIsEqualTo(oldOptions.typeRoots, newOptions.typeRoots) ||
+            !ts.arrayIsEqualTo(oldOptions.rootDirs, newOptions.rootDirs) ||
+            !ts.equalOwnProperties(oldOptions.paths, newOptions.paths);
+    }
+    ts.changesAffectModuleResolution = changesAffectModuleResolution;
+    function findAncestor(node, callback) {
+        while (node) {
+            var result = callback(node);
+            if (result === "quit") {
+                return undefined;
+            }
+            else if (result) {
+                return node;
+            }
+            node = node.parent;
+        }
+        return undefined;
+    }
+    ts.findAncestor = findAncestor;
+    function forEachEntry(map, callback) {
+        var _a;
+        var iterator = map.entries();
+        for (var _b = iterator.next(), pair = _b.value, done = _b.done; !done; _a = iterator.next(), pair = _a.value, done = _a.done, _a) {
+            var key = pair[0], value = pair[1];
+            var result = callback(value, key);
+            if (result) {
+                return result;
+            }
+        }
+        return undefined;
+    }
+    ts.forEachEntry = forEachEntry;
+    function forEachKey(map, callback) {
+        var _a;
+        var iterator = map.keys();
+        for (var _b = iterator.next(), key = _b.value, done = _b.done; !done; _a = iterator.next(), key = _a.value, done = _a.done, _a) {
+            var result = callback(key);
+            if (result) {
+                return result;
+            }
+        }
+        return undefined;
+    }
+    ts.forEachKey = forEachKey;
+    function copyEntries(source, target) {
+        source.forEach(function (value, key) {
+            target.set(key, value);
+        });
+    }
+    ts.copyEntries = copyEntries;
+    function arrayToSet(array, makeKey) {
+        return ts.arrayToMap(array, makeKey || (function (s) { return s; }), function () { return true; });
+    }
+    ts.arrayToSet = arrayToSet;
+    function cloneMap(map) {
+        var clone = ts.createMap();
+        copyEntries(map, clone);
+        return clone;
+    }
+    ts.cloneMap = cloneMap;
     function usingSingleLineStringWriter(action) {
         var oldString = stringWriter.getText();
         try {
@@ -6559,23 +7684,31 @@ var ts;
         return false;
     }
     ts.hasChangesInResolutions = hasChangesInResolutions;
+    // Returns true if this node contains a parse error anywhere underneath it.
     function containsParseError(node) {
         aggregateChildData(node);
-        return (node.flags & 131072) !== 0;
+        return (node.flags & 131072 /* ThisNodeOrAnySubNodesHasError */) !== 0;
     }
     ts.containsParseError = containsParseError;
     function aggregateChildData(node) {
-        if (!(node.flags & 262144)) {
-            var thisNodeOrAnySubNodesHasError = ((node.flags & 32768) !== 0) ||
+        if (!(node.flags & 262144 /* HasAggregatedChildData */)) {
+            // A node is considered to contain a parse error if:
+            //  a) the parser explicitly marked that it had an error
+            //  b) any of it's children reported that it had an error.
+            var thisNodeOrAnySubNodesHasError = ((node.flags & 32768 /* ThisNodeHasError */) !== 0) ||
                 ts.forEachChild(node, containsParseError);
+            // If so, mark ourselves accordingly.
             if (thisNodeOrAnySubNodesHasError) {
-                node.flags |= 131072;
+                node.flags |= 131072 /* ThisNodeOrAnySubNodesHasError */;
             }
-            node.flags |= 262144;
+            // Also mark that we've propagated the child information to this node.  This way we can
+            // always consult the bit directly on this node without needing to check its children
+            // again.
+            node.flags |= 262144 /* HasAggregatedChildData */;
         }
     }
     function getSourceFileOfNode(node) {
-        while (node && node.kind !== 274) {
+        while (node && node.kind !== 274 /* SourceFile */) {
             node = node.parent;
         }
         return node;
@@ -6583,11 +7716,11 @@ var ts;
     ts.getSourceFileOfNode = getSourceFileOfNode;
     function isStatementWithLocals(node) {
         switch (node.kind) {
-            case 213:
-            case 241:
-            case 220:
-            case 221:
-            case 222:
+            case 213 /* Block */:
+            case 241 /* CaseBlock */:
+            case 220 /* ForStatement */:
+            case 221 /* ForInStatement */:
+            case 222 /* ForOfStatement */:
                 return true;
         }
         return false;
@@ -6598,6 +7731,7 @@ var ts;
         return ts.getLineStarts(sourceFile)[line];
     }
     ts.getStartPositionOfLine = getStartPositionOfLine;
+    // This is a useful function for debugging purposes.
     function nodePosToString(node) {
         var file = getSourceFileOfNode(node);
         var loc = ts.getLineAndCharacterOfPosition(file, node.pos);
@@ -6610,12 +7744,19 @@ var ts;
         var lineIndex = line;
         var sourceText = sourceFile.text;
         if (lineIndex + 1 === lineStarts.length) {
+            // last line - return EOF
             return sourceText.length - 1;
         }
         else {
+            // current line start
             var start = lineStarts[lineIndex];
+            // take the start position of the next line - 1 = it should be some line break
             var pos = lineStarts[lineIndex + 1] - 1;
             ts.Debug.assert(ts.isLineBreak(sourceText.charCodeAt(pos)));
+            // walk backwards skipping line breaks, stop the the beginning of current line.
+            // i.e:
+            // <some text>
+            // $ <- end of line for this position should match the start position
             while (start <= pos && ts.isLineBreak(sourceText.charCodeAt(pos))) {
                 pos--;
             }
@@ -6623,21 +7764,45 @@ var ts;
         }
     }
     ts.getEndLinePosition = getEndLinePosition;
+    /**
+     * Returns a value indicating whether a name is unique globally or within the current file.
+     * Note: This does not consider whether a name appears as a free identifier or not, so at the expression `x.y` this includes both `x` and `y`.
+     */
     function isFileLevelUniqueName(sourceFile, name, hasGlobalName) {
         return !(hasGlobalName && hasGlobalName(name)) && !sourceFile.identifiers.has(name);
     }
     ts.isFileLevelUniqueName = isFileLevelUniqueName;
+    // Returns true if this node is missing from the actual source code. A 'missing' node is different
+    // from 'undefined/defined'. When a node is undefined (which can happen for optional nodes
+    // in the tree), it is definitely missing. However, a node may be defined, but still be
+    // missing.  This happens whenever the parser knows it needs to parse something, but can't
+    // get anything in the source code that it expects at that location. For example:
+    //
+    //          let a: ;
+    //
+    // Here, the Type in the Type-Annotation is not-optional (as there is a colon in the source
+    // code). So the parser will attempt to parse out a type, and will create an actual node.
+    // However, this node will be 'missing' in the sense that no actual source-code/tokens are
+    // contained within it.
     function nodeIsMissing(node) {
         if (node === undefined) {
             return true;
         }
-        return node.pos === node.end && node.pos >= 0 && node.kind !== 1;
+        return node.pos === node.end && node.pos >= 0 && node.kind !== 1 /* EndOfFileToken */;
     }
     ts.nodeIsMissing = nodeIsMissing;
     function nodeIsPresent(node) {
         return !nodeIsMissing(node);
     }
     ts.nodeIsPresent = nodeIsPresent;
+    /**
+     * Appends a range of value to begin of an array, returning the array.
+     *
+     * @param to The array to which `value` is to be appended. If `to` is `undefined`, a new array
+     * is created if `value` was appended.
+     * @param from The values to append to the array. If `from` is `undefined`, nothing is
+     * appended. If an element of `from` is `undefined`, that element is not appended.
+     */
     function prependStatements(to, from) {
         if (from === undefined || from.length === 0)
             return to;
@@ -6651,10 +7816,17 @@ var ts;
         return to;
     }
     ts.prependStatements = prependStatements;
+    /**
+     * Determine if the given comment is a triple-slash
+     *
+     * @return true if the comment is a triple-slash comment else false
+     */
     function isRecognizedTripleSlashComment(text, commentPos, commentEnd) {
-        if (text.charCodeAt(commentPos + 1) === 47 &&
+        // Verify this is /// comment, but do the regexp match only when we first can find /// in the comment text
+        // so that we don't end up computing comment string and doing match for all // comments
+        if (text.charCodeAt(commentPos + 1) === 47 /* slash */ &&
             commentPos + 2 < commentEnd &&
-            text.charCodeAt(commentPos + 2) === 47) {
+            text.charCodeAt(commentPos + 2) === 47 /* slash */) {
             var textSubStr = text.substring(commentPos, commentEnd);
             return textSubStr.match(ts.fullTripleSlashReferencePathRegEx) ||
                 textSubStr.match(ts.fullTripleSlashAMDReferencePathRegEx) ||
@@ -6666,21 +7838,27 @@ var ts;
     }
     ts.isRecognizedTripleSlashComment = isRecognizedTripleSlashComment;
     function isPinnedComment(text, start) {
-        return text.charCodeAt(start + 1) === 42 &&
-            text.charCodeAt(start + 2) === 33;
+        return text.charCodeAt(start + 1) === 42 /* asterisk */ &&
+            text.charCodeAt(start + 2) === 33 /* exclamation */;
     }
     ts.isPinnedComment = isPinnedComment;
     function getTokenPosOfNode(node, sourceFile, includeJsDoc) {
+        // With nodes that have no width (i.e. 'Missing' nodes), we actually *don't*
+        // want to skip trivia because this will launch us forward to the next token.
         if (nodeIsMissing(node)) {
             return node.pos;
         }
         if (ts.isJSDocNode(node)) {
-            return ts.skipTrivia((sourceFile || getSourceFileOfNode(node)).text, node.pos, false, true);
+            return ts.skipTrivia((sourceFile || getSourceFileOfNode(node)).text, node.pos, /*stopAfterLineBreak*/ false, /*stopAtComments*/ true);
         }
         if (includeJsDoc && ts.hasJSDocNodes(node)) {
             return getTokenPosOfNode(node.jsDoc[0]);
         }
-        if (node.kind === 299 && node._children.length > 0) {
+        // For a syntax list, it is possible that one of its children has JSDocComment nodes, while
+        // the syntax list itself considers them as normal trivia. Therefore if we simply skip
+        // trivia for the list, we may have skipped the JSDocComment as well. So we should process its
+        // first child to determine the actual position of its first token.
+        if (node.kind === 299 /* SyntaxList */ && node._children.length > 0) {
             return getTokenPosOfNode(node._children[0], sourceFile, includeJsDoc);
         }
         return ts.skipTrivia((sourceFile || getSourceFileOfNode(node)).text, node.pos);
@@ -6714,38 +7892,51 @@ var ts;
     function getPos(range) {
         return range.pos;
     }
+    /**
+     * Note: it is expected that the `nodeArray` and the `node` are within the same file.
+     * For example, searching for a `SourceFile` in a `SourceFile[]` wouldn't work.
+     */
     function indexOfNode(nodeArray, node) {
         return ts.binarySearch(nodeArray, node, getPos, ts.compareValues);
     }
     ts.indexOfNode = indexOfNode;
+    /**
+     * Gets flags that control emit behavior of a node.
+     */
     function getEmitFlags(node) {
         var emitNode = node.emitNode;
         return emitNode && emitNode.flags || 0;
     }
     ts.getEmitFlags = getEmitFlags;
     function getLiteralText(node, sourceFile) {
-        if (!nodeIsSynthesized(node) && node.parent && !(ts.isNumericLiteral(node) && node.numericLiteralFlags & 512)) {
+        // If we don't need to downlevel and we can reach the original source text using
+        // the node's parent reference, then simply get the text as it was originally written.
+        if (!nodeIsSynthesized(node) && node.parent && !(ts.isNumericLiteral(node) && node.numericLiteralFlags & 512 /* ContainsSeparator */)) {
             return getSourceTextOfNodeFromSourceFile(sourceFile, node);
         }
-        var escapeText = getEmitFlags(node) & 16777216 ? escapeString : escapeNonAsciiString;
+        var escapeText = getEmitFlags(node) & 16777216 /* NoAsciiEscaping */ ? escapeString : escapeNonAsciiString;
+        // If we can't reach the original source text, use the canonical form if it's a number,
+        // or a (possibly escaped) quoted form of the original text if it's string-like.
         switch (node.kind) {
-            case 9:
+            case 9 /* StringLiteral */:
                 if (node.singleQuote) {
-                    return "'" + escapeText(node.text, 39) + "'";
+                    return "'" + escapeText(node.text, 39 /* singleQuote */) + "'";
                 }
                 else {
-                    return '"' + escapeText(node.text, 34) + '"';
+                    return '"' + escapeText(node.text, 34 /* doubleQuote */) + '"';
                 }
-            case 13:
-                return "`" + escapeText(node.text, 96) + "`";
-            case 14:
-                return "`" + escapeText(node.text, 96) + "${";
-            case 15:
-                return "}" + escapeText(node.text, 96) + "${";
-            case 16:
-                return "}" + escapeText(node.text, 96) + "`";
-            case 8:
-            case 12:
+            case 13 /* NoSubstitutionTemplateLiteral */:
+                return "`" + escapeText(node.text, 96 /* backtick */) + "`";
+            case 14 /* TemplateHead */:
+                // tslint:disable-next-line no-invalid-template-strings
+                return "`" + escapeText(node.text, 96 /* backtick */) + "${";
+            case 15 /* TemplateMiddle */:
+                // tslint:disable-next-line no-invalid-template-strings
+                return "}" + escapeText(node.text, 96 /* backtick */) + "${";
+            case 16 /* TemplateTail */:
+                return "}" + escapeText(node.text, 96 /* backtick */) + "`";
+            case 8 /* NumericLiteral */:
+            case 12 /* RegularExpressionLiteral */:
                 return node.text;
         }
         return ts.Debug.fail("Literal kind '" + node.kind + "' not accounted for.");
@@ -6755,55 +7946,74 @@ var ts;
         return ts.isString(value) ? '"' + escapeNonAsciiString(value) + '"' : "" + value;
     }
     ts.getTextOfConstantValue = getTextOfConstantValue;
+    // Add an extra underscore to identifiers that start with two underscores to avoid issues with magic names like '__proto__'
     function escapeLeadingUnderscores(identifier) {
-        return (identifier.length >= 2 && identifier.charCodeAt(0) === 95 && identifier.charCodeAt(1) === 95 ? "_" + identifier : identifier);
+        return (identifier.length >= 2 && identifier.charCodeAt(0) === 95 /* _ */ && identifier.charCodeAt(1) === 95 /* _ */ ? "_" + identifier : identifier);
     }
     ts.escapeLeadingUnderscores = escapeLeadingUnderscores;
+    /**
+     * @deprecated Use `id.escapedText` to get the escaped text of an Identifier.
+     * @param identifier The identifier to escape
+     */
     function escapeIdentifier(identifier) {
         return identifier;
     }
     ts.escapeIdentifier = escapeIdentifier;
+    // Make an identifier from an external module name by extracting the string after the last "/" and replacing
+    // all non-alphanumeric characters with underscores
     function makeIdentifierFromModuleName(moduleName) {
         return ts.getBaseFileName(moduleName).replace(/^(\d)/, "_$1").replace(/\W/g, "_");
     }
     ts.makeIdentifierFromModuleName = makeIdentifierFromModuleName;
     function isBlockOrCatchScoped(declaration) {
-        return (ts.getCombinedNodeFlags(declaration) & 3) !== 0 ||
+        return (ts.getCombinedNodeFlags(declaration) & 3 /* BlockScoped */) !== 0 ||
             isCatchClauseVariableDeclarationOrBindingElement(declaration);
     }
     ts.isBlockOrCatchScoped = isBlockOrCatchScoped;
     function isCatchClauseVariableDeclarationOrBindingElement(declaration) {
         var node = getRootDeclaration(declaration);
-        return node.kind === 232 && node.parent.kind === 269;
+        return node.kind === 232 /* VariableDeclaration */ && node.parent.kind === 269 /* CatchClause */;
     }
     ts.isCatchClauseVariableDeclarationOrBindingElement = isCatchClauseVariableDeclarationOrBindingElement;
     function isAmbientModule(node) {
-        return ts.isModuleDeclaration(node) && (node.name.kind === 9 || isGlobalScopeAugmentation(node));
+        return ts.isModuleDeclaration(node) && (node.name.kind === 9 /* StringLiteral */ || isGlobalScopeAugmentation(node));
     }
     ts.isAmbientModule = isAmbientModule;
     function isModuleWithStringLiteralName(node) {
-        return ts.isModuleDeclaration(node) && node.name.kind === 9;
+        return ts.isModuleDeclaration(node) && node.name.kind === 9 /* StringLiteral */;
     }
     ts.isModuleWithStringLiteralName = isModuleWithStringLiteralName;
     function isNonGlobalAmbientModule(node) {
         return ts.isModuleDeclaration(node) && ts.isStringLiteral(node.name);
     }
     ts.isNonGlobalAmbientModule = isNonGlobalAmbientModule;
+    /**
+     * An effective module (namespace) declaration is either
+     * 1. An actual declaration: namespace X { ... }
+     * 2. A Javascript declaration, which is:
+     *    An identifier in a nested property access expression: Y in `X.Y.Z = { ... }`
+     */
+    function isEffectiveModuleDeclaration(node) {
+        return ts.isModuleDeclaration(node) || ts.isIdentifier(node);
+    }
+    ts.isEffectiveModuleDeclaration = isEffectiveModuleDeclaration;
+    /** Given a symbol for a module, checks that it is a shorthand ambient module. */
     function isShorthandAmbientModuleSymbol(moduleSymbol) {
         return isShorthandAmbientModule(moduleSymbol.valueDeclaration);
     }
     ts.isShorthandAmbientModuleSymbol = isShorthandAmbientModuleSymbol;
     function isShorthandAmbientModule(node) {
-        return node && node.kind === 239 && (!node.body);
+        // The only kind of module that can be missing a body is a shorthand ambient module.
+        return node && node.kind === 239 /* ModuleDeclaration */ && (!node.body);
     }
     function isBlockScopedContainerTopLevel(node) {
-        return node.kind === 274 ||
-            node.kind === 239 ||
+        return node.kind === 274 /* SourceFile */ ||
+            node.kind === 239 /* ModuleDeclaration */ ||
             ts.isFunctionLike(node);
     }
     ts.isBlockScopedContainerTopLevel = isBlockScopedContainerTopLevel;
     function isGlobalScopeAugmentation(module) {
-        return !!(module.flags & 512);
+        return !!(module.flags & 512 /* GlobalAugmentation */);
     }
     ts.isGlobalScopeAugmentation = isGlobalScopeAugmentation;
     function isExternalModuleAugmentation(node) {
@@ -6811,10 +8021,13 @@ var ts;
     }
     ts.isExternalModuleAugmentation = isExternalModuleAugmentation;
     function isModuleAugmentationExternal(node) {
+        // external module augmentation is a ambient module declaration that is either:
+        // - defined in the top level scope and source file is an external module
+        // - defined inside ambient module declaration located in the top level scope and source file not an external module
         switch (node.parent.kind) {
-            case 274:
+            case 274 /* SourceFile */:
                 return ts.isExternalModule(node.parent);
-            case 240:
+            case 240 /* ModuleBlock */:
                 return isAmbientModule(node.parent.parent) && ts.isSourceFile(node.parent.parent.parent) && !ts.isExternalModule(node.parent.parent.parent);
         }
         return false;
@@ -6826,22 +8039,24 @@ var ts;
     ts.isEffectiveExternalModule = isEffectiveExternalModule;
     function isBlockScope(node, parentNode) {
         switch (node.kind) {
-            case 274:
-            case 241:
-            case 269:
-            case 239:
-            case 220:
-            case 221:
-            case 222:
-            case 155:
-            case 154:
-            case 156:
-            case 157:
-            case 234:
-            case 192:
-            case 193:
+            case 274 /* SourceFile */:
+            case 241 /* CaseBlock */:
+            case 269 /* CatchClause */:
+            case 239 /* ModuleDeclaration */:
+            case 220 /* ForStatement */:
+            case 221 /* ForInStatement */:
+            case 222 /* ForOfStatement */:
+            case 155 /* Constructor */:
+            case 154 /* MethodDeclaration */:
+            case 156 /* GetAccessor */:
+            case 157 /* SetAccessor */:
+            case 234 /* FunctionDeclaration */:
+            case 192 /* FunctionExpression */:
+            case 193 /* ArrowFunction */:
                 return true;
-            case 213:
+            case 213 /* Block */:
+                // function block is not considered block-scope container
+                // see comment in binder.ts: bind(...), case for SyntaxKind.Block
                 return !ts.isFunctionLike(parentNode);
         }
         return false;
@@ -6849,28 +8064,28 @@ var ts;
     ts.isBlockScope = isBlockScope;
     function isDeclarationWithTypeParameters(node) {
         switch (node.kind) {
-            case 158:
-            case 159:
-            case 153:
-            case 160:
-            case 163:
-            case 164:
-            case 284:
-            case 235:
-            case 205:
-            case 236:
-            case 237:
-            case 296:
-            case 234:
-            case 154:
-            case 155:
-            case 156:
-            case 157:
-            case 192:
-            case 193:
-            case 292:
-            case 297:
-            case 288:
+            case 158 /* CallSignature */:
+            case 159 /* ConstructSignature */:
+            case 153 /* MethodSignature */:
+            case 160 /* IndexSignature */:
+            case 163 /* FunctionType */:
+            case 164 /* ConstructorType */:
+            case 284 /* JSDocFunctionType */:
+            case 235 /* ClassDeclaration */:
+            case 205 /* ClassExpression */:
+            case 236 /* InterfaceDeclaration */:
+            case 237 /* TypeAliasDeclaration */:
+            case 296 /* JSDocTemplateTag */:
+            case 234 /* FunctionDeclaration */:
+            case 154 /* MethodDeclaration */:
+            case 155 /* Constructor */:
+            case 156 /* GetAccessor */:
+            case 157 /* SetAccessor */:
+            case 192 /* FunctionExpression */:
+            case 193 /* ArrowFunction */:
+            case 292 /* JSDocCallbackTag */:
+            case 297 /* JSDocTypedefTag */:
+            case 288 /* JSDocSignature */:
                 return true;
             default:
                 ts.assertTypeIsNever(node);
@@ -6880,8 +8095,8 @@ var ts;
     ts.isDeclarationWithTypeParameters = isDeclarationWithTypeParameters;
     function isAnyImportSyntax(node) {
         switch (node.kind) {
-            case 244:
-            case 243:
+            case 244 /* ImportDeclaration */:
+            case 243 /* ImportEqualsDeclaration */:
                 return true;
             default:
                 return false;
@@ -6890,15 +8105,15 @@ var ts;
     ts.isAnyImportSyntax = isAnyImportSyntax;
     function isLateVisibilityPaintedStatement(node) {
         switch (node.kind) {
-            case 244:
-            case 243:
-            case 214:
-            case 235:
-            case 234:
-            case 239:
-            case 237:
-            case 236:
-            case 238:
+            case 244 /* ImportDeclaration */:
+            case 243 /* ImportEqualsDeclaration */:
+            case 214 /* VariableStatement */:
+            case 235 /* ClassDeclaration */:
+            case 234 /* FunctionDeclaration */:
+            case 239 /* ModuleDeclaration */:
+            case 237 /* TypeAliasDeclaration */:
+            case 236 /* InterfaceDeclaration */:
+            case 238 /* EnumDeclaration */:
                 return true;
             default:
                 return false;
@@ -6909,10 +8124,15 @@ var ts;
         return isAnyImportSyntax(node) || ts.isExportDeclaration(node);
     }
     ts.isAnyImportOrReExport = isAnyImportOrReExport;
+    // Gets the nearest enclosing block scope container that has the provided node
+    // as a descendant, that is not the provided node.
     function getEnclosingBlockScopeContainer(node) {
-        return ts.findAncestor(node.parent, function (current) { return isBlockScope(current, current.parent); });
+        return findAncestor(node.parent, function (current) { return isBlockScope(current, current.parent); });
     }
     ts.getEnclosingBlockScopeContainer = getEnclosingBlockScopeContainer;
+    // Return display name of an identifier
+    // Computed property names will just be emitted as "[<expr>]", where <expr> is the source
+    // text of the expression in the computed property.
     function declarationNameToString(name) {
         return getFullWidth(name) === 0 ? "(Missing)" : getTextOfNode(name);
     }
@@ -6923,13 +8143,13 @@ var ts;
     ts.getNameFromIndexInfo = getNameFromIndexInfo;
     function getTextOfPropertyName(name) {
         switch (name.kind) {
-            case 71:
+            case 71 /* Identifier */:
                 return name.escapedText;
-            case 9:
-            case 8:
+            case 9 /* StringLiteral */:
+            case 8 /* NumericLiteral */:
                 return escapeLeadingUnderscores(name.text);
-            case 147:
-                return isStringOrNumericLiteral(name.expression) ? escapeLeadingUnderscores(name.expression.text) : undefined;
+            case 147 /* ComputedPropertyName */:
+                return isStringOrNumericLiteral(name.expression) ? escapeLeadingUnderscores(name.expression.text) : undefined; // TODO: GH#18217 Almost all uses of this assume the result to be defined!
             default:
                 ts.Debug.assertNever(name);
         }
@@ -6937,11 +8157,11 @@ var ts;
     ts.getTextOfPropertyName = getTextOfPropertyName;
     function entityNameToString(name) {
         switch (name.kind) {
-            case 71:
+            case 71 /* Identifier */:
                 return getFullWidth(name) === 0 ? ts.idText(name) : getTextOfNode(name);
-            case 146:
+            case 146 /* QualifiedName */:
                 return entityNameToString(name.left) + "." + entityNameToString(name.right);
-            case 185:
+            case 185 /* PropertyAccessExpression */:
                 return entityNameToString(name.expression) + "." + entityNameToString(name.name);
             default:
                 throw ts.Debug.assertNever(name);
@@ -6977,7 +8197,7 @@ var ts;
     }
     ts.createDiagnosticForNodeFromMessageChain = createDiagnosticForNodeFromMessageChain;
     function getSpanOfTokenAtPosition(sourceFile, pos) {
-        var scanner = ts.createScanner(sourceFile.languageVersion, true, sourceFile.languageVariant, sourceFile.text, undefined, pos);
+        var scanner = ts.createScanner(sourceFile.languageVersion, /*skipTrivia*/ true, sourceFile.languageVariant, sourceFile.text, /*onError:*/ undefined, pos);
         scanner.scan();
         var start = scanner.getTokenPos();
         return ts.createTextSpanFromBounds(start, scanner.getTextPos());
@@ -6985,10 +8205,12 @@ var ts;
     ts.getSpanOfTokenAtPosition = getSpanOfTokenAtPosition;
     function getErrorSpanForArrowFunction(sourceFile, node) {
         var pos = ts.skipTrivia(sourceFile.text, node.pos);
-        if (node.body && node.body.kind === 213) {
+        if (node.body && node.body.kind === 213 /* Block */) {
             var startLine = ts.getLineAndCharacterOfPosition(sourceFile, node.body.pos).line;
             var endLine = ts.getLineAndCharacterOfPosition(sourceFile, node.body.end).line;
             if (startLine < endLine) {
+                // The arrow function spans multiple lines,
+                // make the error span be the first line, inclusive.
                 return ts.createTextSpan(pos, getEndLinePosition(startLine, sourceFile) - pos + 1);
             }
         }
@@ -6997,40 +8219,46 @@ var ts;
     function getErrorSpanForNode(sourceFile, node) {
         var errorNode = node;
         switch (node.kind) {
-            case 274:
-                var pos_1 = ts.skipTrivia(sourceFile.text, 0, false);
+            case 274 /* SourceFile */:
+                var pos_1 = ts.skipTrivia(sourceFile.text, 0, /*stopAfterLineBreak*/ false);
                 if (pos_1 === sourceFile.text.length) {
+                    // file is empty - return span for the beginning of the file
                     return ts.createTextSpan(0, 0);
                 }
                 return getSpanOfTokenAtPosition(sourceFile, pos_1);
-            case 232:
-            case 182:
-            case 235:
-            case 205:
-            case 236:
-            case 239:
-            case 238:
-            case 273:
-            case 234:
-            case 192:
-            case 154:
-            case 156:
-            case 157:
-            case 237:
-            case 152:
-            case 151:
+            // This list is a work in progress. Add missing node kinds to improve their error
+            // spans.
+            case 232 /* VariableDeclaration */:
+            case 182 /* BindingElement */:
+            case 235 /* ClassDeclaration */:
+            case 205 /* ClassExpression */:
+            case 236 /* InterfaceDeclaration */:
+            case 239 /* ModuleDeclaration */:
+            case 238 /* EnumDeclaration */:
+            case 273 /* EnumMember */:
+            case 234 /* FunctionDeclaration */:
+            case 192 /* FunctionExpression */:
+            case 154 /* MethodDeclaration */:
+            case 156 /* GetAccessor */:
+            case 157 /* SetAccessor */:
+            case 237 /* TypeAliasDeclaration */:
+            case 152 /* PropertyDeclaration */:
+            case 151 /* PropertySignature */:
                 errorNode = node.name;
                 break;
-            case 193:
+            case 193 /* ArrowFunction */:
                 return getErrorSpanForArrowFunction(sourceFile, node);
         }
         if (errorNode === undefined) {
+            // If we don't have a better node, then just set the error on the first token of
+            // construct.
             return getSpanOfTokenAtPosition(sourceFile, node.pos);
         }
         var isMissing = nodeIsMissing(errorNode);
         var pos = isMissing
             ? errorNode.pos
             : ts.skipTrivia(sourceFile.text, errorNode.pos);
+        // These asserts should all be satisfied for a properly constructed `errorNode`.
         if (isMissing) {
             ts.Debug.assert(pos === errorNode.pos, "This failure could trigger https://github.com/Microsoft/TypeScript/issues/20809");
             ts.Debug.assert(pos === errorNode.end, "This failure could trigger https://github.com/Microsoft/TypeScript/issues/20809");
@@ -7047,57 +8275,58 @@ var ts;
     }
     ts.isExternalOrCommonJsModule = isExternalOrCommonJsModule;
     function isJsonSourceFile(file) {
-        return file.scriptKind === 6;
+        return file.scriptKind === 6 /* JSON */;
     }
     ts.isJsonSourceFile = isJsonSourceFile;
     function isConstEnumDeclaration(node) {
-        return node.kind === 238 && isConst(node);
+        return node.kind === 238 /* EnumDeclaration */ && isConst(node);
     }
     ts.isConstEnumDeclaration = isConstEnumDeclaration;
     function isConst(node) {
-        return !!(ts.getCombinedNodeFlags(node) & 2)
-            || !!(ts.getCombinedModifierFlags(node) & 2048);
+        return !!(ts.getCombinedNodeFlags(node) & 2 /* Const */)
+            || !!(ts.getCombinedModifierFlags(node) & 2048 /* Const */);
     }
     ts.isConst = isConst;
     function isLet(node) {
-        return !!(ts.getCombinedNodeFlags(node) & 1);
+        return !!(ts.getCombinedNodeFlags(node) & 1 /* Let */);
     }
     ts.isLet = isLet;
     function isSuperCall(n) {
-        return n.kind === 187 && n.expression.kind === 97;
+        return n.kind === 187 /* CallExpression */ && n.expression.kind === 97 /* SuperKeyword */;
     }
     ts.isSuperCall = isSuperCall;
     function isImportCall(n) {
-        return n.kind === 187 && n.expression.kind === 91;
+        return n.kind === 187 /* CallExpression */ && n.expression.kind === 91 /* ImportKeyword */;
     }
     ts.isImportCall = isImportCall;
     function isLiteralImportTypeNode(n) {
-        return n.kind === 179 &&
-            n.argument.kind === 178 &&
+        return n.kind === 179 /* ImportType */ &&
+            n.argument.kind === 178 /* LiteralType */ &&
             ts.isStringLiteral(n.argument.literal);
     }
     ts.isLiteralImportTypeNode = isLiteralImportTypeNode;
     function isPrologueDirective(node) {
-        return node.kind === 216
-            && node.expression.kind === 9;
+        return node.kind === 216 /* ExpressionStatement */
+            && node.expression.kind === 9 /* StringLiteral */;
     }
     ts.isPrologueDirective = isPrologueDirective;
     function getLeadingCommentRangesOfNode(node, sourceFileOfNode) {
-        return node.kind !== 10 ? ts.getLeadingCommentRanges(sourceFileOfNode.text, node.pos) : undefined;
+        return node.kind !== 10 /* JsxText */ ? ts.getLeadingCommentRanges(sourceFileOfNode.text, node.pos) : undefined;
     }
     ts.getLeadingCommentRangesOfNode = getLeadingCommentRangesOfNode;
     function getJSDocCommentRanges(node, text) {
-        var commentRanges = (node.kind === 149 ||
-            node.kind === 148 ||
-            node.kind === 192 ||
-            node.kind === 193 ||
-            node.kind === 191) ?
+        var commentRanges = (node.kind === 149 /* Parameter */ ||
+            node.kind === 148 /* TypeParameter */ ||
+            node.kind === 192 /* FunctionExpression */ ||
+            node.kind === 193 /* ArrowFunction */ ||
+            node.kind === 191 /* ParenthesizedExpression */) ?
             ts.concatenate(ts.getTrailingCommentRanges(text, node.pos), ts.getLeadingCommentRanges(text, node.pos)) :
             ts.getLeadingCommentRanges(text, node.pos);
+        // True if the comment starts with '/**' but not if it is '/**/'
         return ts.filter(commentRanges, function (comment) {
-            return text.charCodeAt(comment.pos + 1) === 42 &&
-                text.charCodeAt(comment.pos + 2) === 42 &&
-                text.charCodeAt(comment.pos + 3) !== 47;
+            return text.charCodeAt(comment.pos + 1) === 42 /* asterisk */ &&
+                text.charCodeAt(comment.pos + 2) === 42 /* asterisk */ &&
+                text.charCodeAt(comment.pos + 3) !== 47 /* slash */;
         });
     }
     ts.getJSDocCommentRanges = getJSDocCommentRanges;
@@ -7106,75 +8335,87 @@ var ts;
     ts.fullTripleSlashAMDReferencePathRegEx = /^(\/\/\/\s*<amd-dependency\s+path\s*=\s*)('|")(.+?)\2.*?\/>/;
     var defaultLibReferenceRegEx = /^(\/\/\/\s*<reference\s+no-default-lib\s*=\s*)('|")(.+?)\2\s*\/>/;
     function isPartOfTypeNode(node) {
-        if (161 <= node.kind && node.kind <= 179) {
+        if (161 /* FirstTypeNode */ <= node.kind && node.kind <= 179 /* LastTypeNode */) {
             return true;
         }
         switch (node.kind) {
-            case 119:
-            case 142:
-            case 134:
-            case 137:
-            case 122:
-            case 138:
-            case 140:
-            case 131:
+            case 119 /* AnyKeyword */:
+            case 142 /* UnknownKeyword */:
+            case 134 /* NumberKeyword */:
+            case 137 /* StringKeyword */:
+            case 122 /* BooleanKeyword */:
+            case 138 /* SymbolKeyword */:
+            case 140 /* UndefinedKeyword */:
+            case 131 /* NeverKeyword */:
                 return true;
-            case 105:
-                return node.parent.kind !== 196;
-            case 207:
+            case 105 /* VoidKeyword */:
+                return node.parent.kind !== 196 /* VoidExpression */;
+            case 207 /* ExpressionWithTypeArguments */:
                 return !isExpressionWithTypeArgumentsInClassExtendsClause(node);
-            case 148:
-                return node.parent.kind === 177 || node.parent.kind === 172;
-            case 71:
-                if (node.parent.kind === 146 && node.parent.right === node) {
+            case 148 /* TypeParameter */:
+                return node.parent.kind === 177 /* MappedType */ || node.parent.kind === 172 /* InferType */;
+            // Identifiers and qualified names may be type nodes, depending on their context. Climb
+            // above them to find the lowest container
+            case 71 /* Identifier */:
+                // If the identifier is the RHS of a qualified name, then it's a type iff its parent is.
+                if (node.parent.kind === 146 /* QualifiedName */ && node.parent.right === node) {
                     node = node.parent;
                 }
-                else if (node.parent.kind === 185 && node.parent.name === node) {
+                else if (node.parent.kind === 185 /* PropertyAccessExpression */ && node.parent.name === node) {
                     node = node.parent;
                 }
-                ts.Debug.assert(node.kind === 71 || node.kind === 146 || node.kind === 185, "'node' was expected to be a qualified name, identifier or property access in 'isPartOfTypeNode'.");
-            case 146:
-            case 185:
-            case 99: {
+                // At this point, node is either a qualified name or an identifier
+                ts.Debug.assert(node.kind === 71 /* Identifier */ || node.kind === 146 /* QualifiedName */ || node.kind === 185 /* PropertyAccessExpression */, "'node' was expected to be a qualified name, identifier or property access in 'isPartOfTypeNode'.");
+            // falls through
+            case 146 /* QualifiedName */:
+            case 185 /* PropertyAccessExpression */:
+            case 99 /* ThisKeyword */: {
                 var parent = node.parent;
-                if (parent.kind === 165) {
+                if (parent.kind === 165 /* TypeQuery */) {
                     return false;
                 }
-                if (parent.kind === 179) {
+                if (parent.kind === 179 /* ImportType */) {
                     return !parent.isTypeOf;
                 }
-                if (161 <= parent.kind && parent.kind <= 179) {
+                // Do not recursively call isPartOfTypeNode on the parent. In the example:
+                //
+                //     let a: A.B.C;
+                //
+                // Calling isPartOfTypeNode would consider the qualified name A.B a type node.
+                // Only C and A.B.C are type nodes.
+                if (161 /* FirstTypeNode */ <= parent.kind && parent.kind <= 179 /* LastTypeNode */) {
                     return true;
                 }
                 switch (parent.kind) {
-                    case 207:
+                    case 207 /* ExpressionWithTypeArguments */:
                         return !isExpressionWithTypeArgumentsInClassExtendsClause(parent);
-                    case 148:
+                    case 148 /* TypeParameter */:
                         return node === parent.constraint;
-                    case 152:
-                    case 151:
-                    case 149:
-                    case 232:
+                    case 152 /* PropertyDeclaration */:
+                    case 151 /* PropertySignature */:
+                    case 149 /* Parameter */:
+                    case 232 /* VariableDeclaration */:
                         return node === parent.type;
-                    case 234:
-                    case 192:
-                    case 193:
-                    case 155:
-                    case 154:
-                    case 153:
-                    case 156:
-                    case 157:
+                    case 234 /* FunctionDeclaration */:
+                    case 192 /* FunctionExpression */:
+                    case 193 /* ArrowFunction */:
+                    case 155 /* Constructor */:
+                    case 154 /* MethodDeclaration */:
+                    case 153 /* MethodSignature */:
+                    case 156 /* GetAccessor */:
+                    case 157 /* SetAccessor */:
                         return node === parent.type;
-                    case 158:
-                    case 159:
-                    case 160:
+                    case 158 /* CallSignature */:
+                    case 159 /* ConstructSignature */:
+                    case 160 /* IndexSignature */:
                         return node === parent.type;
-                    case 190:
+                    case 190 /* TypeAssertionExpression */:
                         return node === parent.type;
-                    case 187:
-                    case 188:
+                    case 187 /* CallExpression */:
+                    case 188 /* NewExpression */:
                         return ts.contains(parent.typeArguments, node);
-                    case 189:
+                    case 189 /* TaggedTemplateExpression */:
+                        // TODO (drosen): TaggedTemplateExpressions may eventually support type arguments.
                         return false;
                 }
             }
@@ -7192,27 +8433,29 @@ var ts;
         return false;
     }
     ts.isChildOfNodeWithKind = isChildOfNodeWithKind;
+    // Warning: This has the same semantics as the forEach family of functions,
+    //          in that traversal terminates in the event that 'visitor' supplies a truthy value.
     function forEachReturnStatement(body, visitor) {
         return traverse(body);
         function traverse(node) {
             switch (node.kind) {
-                case 225:
+                case 225 /* ReturnStatement */:
                     return visitor(node);
-                case 241:
-                case 213:
-                case 217:
-                case 218:
-                case 219:
-                case 220:
-                case 221:
-                case 222:
-                case 226:
-                case 227:
-                case 266:
-                case 267:
-                case 228:
-                case 230:
-                case 269:
+                case 241 /* CaseBlock */:
+                case 213 /* Block */:
+                case 217 /* IfStatement */:
+                case 218 /* DoStatement */:
+                case 219 /* WhileStatement */:
+                case 220 /* ForStatement */:
+                case 221 /* ForInStatement */:
+                case 222 /* ForOfStatement */:
+                case 226 /* WithStatement */:
+                case 227 /* SwitchStatement */:
+                case 266 /* CaseClause */:
+                case 267 /* DefaultClause */:
+                case 228 /* LabeledStatement */:
+                case 230 /* TryStatement */:
+                case 269 /* CatchClause */:
                     return ts.forEachChild(node, traverse);
             }
         }
@@ -7222,39 +8465,52 @@ var ts;
         return traverse(body);
         function traverse(node) {
             switch (node.kind) {
-                case 203:
+                case 203 /* YieldExpression */:
                     visitor(node);
                     var operand = node.expression;
                     if (operand) {
                         traverse(operand);
                     }
                     return;
-                case 238:
-                case 236:
-                case 239:
-                case 237:
-                case 235:
-                case 205:
+                case 238 /* EnumDeclaration */:
+                case 236 /* InterfaceDeclaration */:
+                case 239 /* ModuleDeclaration */:
+                case 237 /* TypeAliasDeclaration */:
+                case 235 /* ClassDeclaration */:
+                case 205 /* ClassExpression */:
+                    // These are not allowed inside a generator now, but eventually they may be allowed
+                    // as local types. Regardless, any yield statements contained within them should be
+                    // skipped in this traversal.
                     return;
                 default:
                     if (ts.isFunctionLike(node)) {
-                        if (node.name && node.name.kind === 147) {
+                        if (node.name && node.name.kind === 147 /* ComputedPropertyName */) {
+                            // Note that we will not include methods/accessors of a class because they would require
+                            // first descending into the class. This is by design.
                             traverse(node.name.expression);
                             return;
                         }
                     }
                     else if (!isPartOfTypeNode(node)) {
+                        // This is the general case, which should include mostly expressions and statements.
+                        // Also includes NodeArrays.
                         ts.forEachChild(node, traverse);
                     }
             }
         }
     }
     ts.forEachYieldExpression = forEachYieldExpression;
+    /**
+     * Gets the most likely element type for a TypeNode. This is not an exhaustive test
+     * as it assumes a rest argument can only be an array type (either T[], or Array<T>).
+     *
+     * @param node The type node.
+     */
     function getRestParameterElementType(node) {
-        if (node && node.kind === 167) {
+        if (node && node.kind === 167 /* ArrayType */) {
             return node.elementType;
         }
-        else if (node && node.kind === 162) {
+        else if (node && node.kind === 162 /* TypeReference */) {
             return ts.singleOrUndefined(node.typeArguments);
         }
         else {
@@ -7264,12 +8520,12 @@ var ts;
     ts.getRestParameterElementType = getRestParameterElementType;
     function getMembersOfDeclaration(node) {
         switch (node.kind) {
-            case 236:
-            case 235:
-            case 205:
-            case 166:
+            case 236 /* InterfaceDeclaration */:
+            case 235 /* ClassDeclaration */:
+            case 205 /* ClassExpression */:
+            case 166 /* TypeLiteral */:
                 return node.members;
-            case 184:
+            case 184 /* ObjectLiteralExpression */:
                 return node.properties;
         }
     }
@@ -7277,14 +8533,14 @@ var ts;
     function isVariableLike(node) {
         if (node) {
             switch (node.kind) {
-                case 182:
-                case 273:
-                case 149:
-                case 270:
-                case 152:
-                case 151:
-                case 271:
-                case 232:
+                case 182 /* BindingElement */:
+                case 273 /* EnumMember */:
+                case 149 /* Parameter */:
+                case 270 /* PropertyAssignment */:
+                case 152 /* PropertyDeclaration */:
+                case 151 /* PropertySignature */:
+                case 271 /* ShorthandPropertyAssignment */:
+                case 232 /* VariableDeclaration */:
                     return true;
             }
         }
@@ -7296,8 +8552,8 @@ var ts;
     }
     ts.isVariableLikeOrAccessor = isVariableLikeOrAccessor;
     function isVariableDeclarationInVariableStatement(node) {
-        return node.parent.kind === 233
-            && node.parent.parent.kind === 214;
+        return node.parent.kind === 233 /* VariableDeclarationList */
+            && node.parent.parent.kind === 214 /* VariableStatement */;
     }
     ts.isVariableDeclarationInVariableStatement = isVariableDeclarationInVariableStatement;
     function isValidESSymbolDeclaration(node) {
@@ -7308,13 +8564,13 @@ var ts;
     ts.isValidESSymbolDeclaration = isValidESSymbolDeclaration;
     function introducesArgumentsExoticObject(node) {
         switch (node.kind) {
-            case 154:
-            case 153:
-            case 155:
-            case 156:
-            case 157:
-            case 234:
-            case 192:
+            case 154 /* MethodDeclaration */:
+            case 153 /* MethodSignature */:
+            case 155 /* Constructor */:
+            case 156 /* GetAccessor */:
+            case 157 /* SetAccessor */:
+            case 234 /* FunctionDeclaration */:
+            case 192 /* FunctionExpression */:
                 return true;
         }
         return false;
@@ -7325,7 +8581,7 @@ var ts;
             if (beforeUnwrapLabelCallback) {
                 beforeUnwrapLabelCallback(node);
             }
-            if (node.statement.kind !== 228) {
+            if (node.statement.kind !== 228 /* LabeledStatement */) {
                 return node.statement;
             }
             node = node.statement;
@@ -7333,30 +8589,30 @@ var ts;
     }
     ts.unwrapInnermostStatementOfLabel = unwrapInnermostStatementOfLabel;
     function isFunctionBlock(node) {
-        return node && node.kind === 213 && ts.isFunctionLike(node.parent);
+        return node && node.kind === 213 /* Block */ && ts.isFunctionLike(node.parent);
     }
     ts.isFunctionBlock = isFunctionBlock;
     function isObjectLiteralMethod(node) {
-        return node && node.kind === 154 && node.parent.kind === 184;
+        return node && node.kind === 154 /* MethodDeclaration */ && node.parent.kind === 184 /* ObjectLiteralExpression */;
     }
     ts.isObjectLiteralMethod = isObjectLiteralMethod;
     function isObjectLiteralOrClassExpressionMethod(node) {
-        return node.kind === 154 &&
-            (node.parent.kind === 184 ||
-                node.parent.kind === 205);
+        return node.kind === 154 /* MethodDeclaration */ &&
+            (node.parent.kind === 184 /* ObjectLiteralExpression */ ||
+                node.parent.kind === 205 /* ClassExpression */);
     }
     ts.isObjectLiteralOrClassExpressionMethod = isObjectLiteralOrClassExpressionMethod;
     function isIdentifierTypePredicate(predicate) {
-        return predicate && predicate.kind === 1;
+        return predicate && predicate.kind === 1 /* Identifier */;
     }
     ts.isIdentifierTypePredicate = isIdentifierTypePredicate;
     function isThisTypePredicate(predicate) {
-        return predicate && predicate.kind === 0;
+        return predicate && predicate.kind === 0 /* This */;
     }
     ts.isThisTypePredicate = isThisTypePredicate;
     function getPropertyAssignment(objectLiteral, key, key2) {
         return objectLiteral.properties.filter(function (property) {
-            if (property.kind === 270) {
+            if (property.kind === 270 /* PropertyAssignment */) {
                 var propName = getTextOfPropertyName(property.name);
                 return key === propName || (!!key2 && key2 === propName);
             }
@@ -7385,72 +8641,95 @@ var ts;
     }
     ts.getTsConfigPropArray = getTsConfigPropArray;
     function getContainingFunction(node) {
-        return ts.findAncestor(node.parent, ts.isFunctionLike);
+        return findAncestor(node.parent, ts.isFunctionLike);
     }
     ts.getContainingFunction = getContainingFunction;
     function getContainingClass(node) {
-        return ts.findAncestor(node.parent, ts.isClassLike);
+        return findAncestor(node.parent, ts.isClassLike);
     }
     ts.getContainingClass = getContainingClass;
     function getThisContainer(node, includeArrowFunctions) {
-        ts.Debug.assert(node.kind !== 274);
+        ts.Debug.assert(node.kind !== 274 /* SourceFile */);
         while (true) {
             node = node.parent;
             if (!node) {
-                return ts.Debug.fail();
+                return ts.Debug.fail(); // If we never pass in a SourceFile, this should be unreachable, since we'll stop when we reach that.
             }
             switch (node.kind) {
-                case 147:
+                case 147 /* ComputedPropertyName */:
+                    // If the grandparent node is an object literal (as opposed to a class),
+                    // then the computed property is not a 'this' container.
+                    // A computed property name in a class needs to be a this container
+                    // so that we can error on it.
                     if (ts.isClassLike(node.parent.parent)) {
                         return node;
                     }
+                    // If this is a computed property, then the parent should not
+                    // make it a this container. The parent might be a property
+                    // in an object literal, like a method or accessor. But in order for
+                    // such a parent to be a this container, the reference must be in
+                    // the *body* of the container.
                     node = node.parent;
                     break;
-                case 150:
-                    if (node.parent.kind === 149 && ts.isClassElement(node.parent.parent)) {
+                case 150 /* Decorator */:
+                    // Decorators are always applied outside of the body of a class or method.
+                    if (node.parent.kind === 149 /* Parameter */ && ts.isClassElement(node.parent.parent)) {
+                        // If the decorator's parent is a Parameter, we resolve the this container from
+                        // the grandparent class declaration.
                         node = node.parent.parent;
                     }
                     else if (ts.isClassElement(node.parent)) {
+                        // If the decorator's parent is a class element, we resolve the 'this' container
+                        // from the parent class declaration.
                         node = node.parent;
                     }
                     break;
-                case 193:
+                case 193 /* ArrowFunction */:
                     if (!includeArrowFunctions) {
                         continue;
                     }
-                case 234:
-                case 192:
-                case 239:
-                case 152:
-                case 151:
-                case 154:
-                case 153:
-                case 155:
-                case 156:
-                case 157:
-                case 158:
-                case 159:
-                case 160:
-                case 238:
-                case 274:
+                // falls through
+                case 234 /* FunctionDeclaration */:
+                case 192 /* FunctionExpression */:
+                case 239 /* ModuleDeclaration */:
+                case 152 /* PropertyDeclaration */:
+                case 151 /* PropertySignature */:
+                case 154 /* MethodDeclaration */:
+                case 153 /* MethodSignature */:
+                case 155 /* Constructor */:
+                case 156 /* GetAccessor */:
+                case 157 /* SetAccessor */:
+                case 158 /* CallSignature */:
+                case 159 /* ConstructSignature */:
+                case 160 /* IndexSignature */:
+                case 238 /* EnumDeclaration */:
+                case 274 /* SourceFile */:
                     return node;
             }
         }
     }
     ts.getThisContainer = getThisContainer;
     function getNewTargetContainer(node) {
-        var container = getThisContainer(node, false);
+        var container = getThisContainer(node, /*includeArrowFunctions*/ false);
         if (container) {
             switch (container.kind) {
-                case 155:
-                case 234:
-                case 192:
+                case 155 /* Constructor */:
+                case 234 /* FunctionDeclaration */:
+                case 192 /* FunctionExpression */:
                     return container;
             }
         }
         return undefined;
     }
     ts.getNewTargetContainer = getNewTargetContainer;
+    /**
+     * Given an super call/property node, returns the closest node where
+     * - a super call/property access is legal in the node and not legal in the parent node the node.
+     *   i.e. super call is legal in constructor but not legal in the class body.
+     * - the container is an arrow function (so caller might need to call getSuperContainer again in case it needs to climb higher)
+     * - a super call/property is definitely illegal in the container (but might be legal in some subnode)
+     *   i.e. super property access is illegal in function declaration but can be legal in the statement list
+     */
     function getSuperContainer(node, stopOnFunctions) {
         while (true) {
             node = node.parent;
@@ -7458,28 +8737,34 @@ var ts;
                 return node;
             }
             switch (node.kind) {
-                case 147:
+                case 147 /* ComputedPropertyName */:
                     node = node.parent;
                     break;
-                case 234:
-                case 192:
-                case 193:
+                case 234 /* FunctionDeclaration */:
+                case 192 /* FunctionExpression */:
+                case 193 /* ArrowFunction */:
                     if (!stopOnFunctions) {
                         continue;
                     }
-                case 152:
-                case 151:
-                case 154:
-                case 153:
-                case 155:
-                case 156:
-                case 157:
+                // falls through
+                case 152 /* PropertyDeclaration */:
+                case 151 /* PropertySignature */:
+                case 154 /* MethodDeclaration */:
+                case 153 /* MethodSignature */:
+                case 155 /* Constructor */:
+                case 156 /* GetAccessor */:
+                case 157 /* SetAccessor */:
                     return node;
-                case 150:
-                    if (node.parent.kind === 149 && ts.isClassElement(node.parent.parent)) {
+                case 150 /* Decorator */:
+                    // Decorators are always applied outside of the body of a class or method.
+                    if (node.parent.kind === 149 /* Parameter */ && ts.isClassElement(node.parent.parent)) {
+                        // If the decorator's parent is a Parameter, we resolve the this container from
+                        // the grandparent class declaration.
                         node = node.parent.parent;
                     }
                     else if (ts.isClassElement(node.parent)) {
+                        // If the decorator's parent is a class element, we resolve the 'this' container
+                        // from the parent class declaration.
                         node = node.parent;
                     }
                     break;
@@ -7488,41 +8773,47 @@ var ts;
     }
     ts.getSuperContainer = getSuperContainer;
     function getImmediatelyInvokedFunctionExpression(func) {
-        if (func.kind === 192 || func.kind === 193) {
+        if (func.kind === 192 /* FunctionExpression */ || func.kind === 193 /* ArrowFunction */) {
             var prev = func;
             var parent = func.parent;
-            while (parent.kind === 191) {
+            while (parent.kind === 191 /* ParenthesizedExpression */) {
                 prev = parent;
                 parent = parent.parent;
             }
-            if (parent.kind === 187 && parent.expression === prev) {
+            if (parent.kind === 187 /* CallExpression */ && parent.expression === prev) {
                 return parent;
             }
         }
     }
     ts.getImmediatelyInvokedFunctionExpression = getImmediatelyInvokedFunctionExpression;
+    /**
+     * Determines whether a node is a property or element access expression for `super`.
+     */
     function isSuperProperty(node) {
         var kind = node.kind;
-        return (kind === 185 || kind === 186)
-            && node.expression.kind === 97;
+        return (kind === 185 /* PropertyAccessExpression */ || kind === 186 /* ElementAccessExpression */)
+            && node.expression.kind === 97 /* SuperKeyword */;
     }
     ts.isSuperProperty = isSuperProperty;
+    /**
+     * Determines whether a node is a property or element access expression for `this`.
+     */
     function isThisProperty(node) {
         var kind = node.kind;
-        return (kind === 185 || kind === 186)
-            && node.expression.kind === 99;
+        return (kind === 185 /* PropertyAccessExpression */ || kind === 186 /* ElementAccessExpression */)
+            && node.expression.kind === 99 /* ThisKeyword */;
     }
     ts.isThisProperty = isThisProperty;
     function getEntityNameFromTypeNode(node) {
         switch (node.kind) {
-            case 162:
+            case 162 /* TypeReference */:
                 return node.typeName;
-            case 207:
+            case 207 /* ExpressionWithTypeArguments */:
                 return isEntityNameExpression(node.expression)
                     ? node.expression
                     : undefined;
-            case 71:
-            case 146:
+            case 71 /* Identifier */:
+            case 146 /* QualifiedName */:
                 return node;
         }
         return undefined;
@@ -7530,10 +8821,10 @@ var ts;
     ts.getEntityNameFromTypeNode = getEntityNameFromTypeNode;
     function getInvokedExpression(node) {
         switch (node.kind) {
-            case 189:
+            case 189 /* TaggedTemplateExpression */:
                 return node.tag;
-            case 257:
-            case 256:
+            case 257 /* JsxOpeningElement */:
+            case 256 /* JsxSelfClosingElement */:
                 return node.tagName;
             default:
                 return node.expression;
@@ -7542,41 +8833,45 @@ var ts;
     ts.getInvokedExpression = getInvokedExpression;
     function nodeCanBeDecorated(node, parent, grandparent) {
         switch (node.kind) {
-            case 235:
+            case 235 /* ClassDeclaration */:
+                // classes are valid targets
                 return true;
-            case 152:
-                return parent.kind === 235;
-            case 156:
-            case 157:
-            case 154:
+            case 152 /* PropertyDeclaration */:
+                // property declarations are valid if their parent is a class declaration.
+                return parent.kind === 235 /* ClassDeclaration */;
+            case 156 /* GetAccessor */:
+            case 157 /* SetAccessor */:
+            case 154 /* MethodDeclaration */:
+                // if this method has a body and its parent is a class declaration, this is a valid target.
                 return node.body !== undefined
-                    && parent.kind === 235;
-            case 149:
+                    && parent.kind === 235 /* ClassDeclaration */;
+            case 149 /* Parameter */:
+                // if the parameter's parent has a body and its grandparent is a class declaration, this is a valid target;
                 return parent.body !== undefined
-                    && (parent.kind === 155
-                        || parent.kind === 154
-                        || parent.kind === 157)
-                    && grandparent.kind === 235;
+                    && (parent.kind === 155 /* Constructor */
+                        || parent.kind === 154 /* MethodDeclaration */
+                        || parent.kind === 157 /* SetAccessor */)
+                    && grandparent.kind === 235 /* ClassDeclaration */;
         }
         return false;
     }
     ts.nodeCanBeDecorated = nodeCanBeDecorated;
     function nodeIsDecorated(node, parent, grandparent) {
         return node.decorators !== undefined
-            && nodeCanBeDecorated(node, parent, grandparent);
+            && nodeCanBeDecorated(node, parent, grandparent); // TODO: GH#18217
     }
     ts.nodeIsDecorated = nodeIsDecorated;
     function nodeOrChildIsDecorated(node, parent, grandparent) {
-        return nodeIsDecorated(node, parent, grandparent) || childIsDecorated(node, parent);
+        return nodeIsDecorated(node, parent, grandparent) || childIsDecorated(node, parent); // TODO: GH#18217
     }
     ts.nodeOrChildIsDecorated = nodeOrChildIsDecorated;
     function childIsDecorated(node, parent) {
         switch (node.kind) {
-            case 235:
-                return ts.some(node.members, function (m) { return nodeOrChildIsDecorated(m, node, parent); });
-            case 154:
-            case 157:
-                return ts.some(node.parameters, function (p) { return nodeIsDecorated(p, node, parent); });
+            case 235 /* ClassDeclaration */:
+                return ts.some(node.members, function (m) { return nodeOrChildIsDecorated(m, node, parent); }); // TODO: GH#18217
+            case 154 /* MethodDeclaration */:
+            case 157 /* SetAccessor */:
+                return ts.some(node.parameters, function (p) { return nodeIsDecorated(p, node, parent); }); // TODO: GH#18217
             default:
                 return false;
         }
@@ -7584,9 +8879,9 @@ var ts;
     ts.childIsDecorated = childIsDecorated;
     function isJSXTagName(node) {
         var parent = node.parent;
-        if (parent.kind === 257 ||
-            parent.kind === 256 ||
-            parent.kind === 258) {
+        if (parent.kind === 257 /* JsxOpeningElement */ ||
+            parent.kind === 256 /* JsxSelfClosingElement */ ||
+            parent.kind === 258 /* JsxClosingElement */) {
             return parent.tagName === node;
         }
         return false;
@@ -7594,55 +8889,56 @@ var ts;
     ts.isJSXTagName = isJSXTagName;
     function isExpressionNode(node) {
         switch (node.kind) {
-            case 97:
-            case 95:
-            case 101:
-            case 86:
-            case 12:
-            case 183:
-            case 184:
-            case 185:
-            case 186:
-            case 187:
-            case 188:
-            case 189:
-            case 208:
-            case 190:
-            case 209:
-            case 191:
-            case 192:
-            case 205:
-            case 193:
-            case 196:
-            case 194:
-            case 195:
-            case 198:
-            case 199:
-            case 200:
-            case 201:
-            case 204:
-            case 202:
-            case 13:
-            case 206:
-            case 255:
-            case 256:
-            case 259:
-            case 203:
-            case 197:
-            case 210:
+            case 97 /* SuperKeyword */:
+            case 95 /* NullKeyword */:
+            case 101 /* TrueKeyword */:
+            case 86 /* FalseKeyword */:
+            case 12 /* RegularExpressionLiteral */:
+            case 183 /* ArrayLiteralExpression */:
+            case 184 /* ObjectLiteralExpression */:
+            case 185 /* PropertyAccessExpression */:
+            case 186 /* ElementAccessExpression */:
+            case 187 /* CallExpression */:
+            case 188 /* NewExpression */:
+            case 189 /* TaggedTemplateExpression */:
+            case 208 /* AsExpression */:
+            case 190 /* TypeAssertionExpression */:
+            case 209 /* NonNullExpression */:
+            case 191 /* ParenthesizedExpression */:
+            case 192 /* FunctionExpression */:
+            case 205 /* ClassExpression */:
+            case 193 /* ArrowFunction */:
+            case 196 /* VoidExpression */:
+            case 194 /* DeleteExpression */:
+            case 195 /* TypeOfExpression */:
+            case 198 /* PrefixUnaryExpression */:
+            case 199 /* PostfixUnaryExpression */:
+            case 200 /* BinaryExpression */:
+            case 201 /* ConditionalExpression */:
+            case 204 /* SpreadElement */:
+            case 202 /* TemplateExpression */:
+            case 13 /* NoSubstitutionTemplateLiteral */:
+            case 206 /* OmittedExpression */:
+            case 255 /* JsxElement */:
+            case 256 /* JsxSelfClosingElement */:
+            case 259 /* JsxFragment */:
+            case 203 /* YieldExpression */:
+            case 197 /* AwaitExpression */:
+            case 210 /* MetaProperty */:
                 return true;
-            case 146:
-                while (node.parent.kind === 146) {
+            case 146 /* QualifiedName */:
+                while (node.parent.kind === 146 /* QualifiedName */) {
                     node = node.parent;
                 }
-                return node.parent.kind === 165 || isJSXTagName(node);
-            case 71:
-                if (node.parent.kind === 165 || isJSXTagName(node)) {
+                return node.parent.kind === 165 /* TypeQuery */ || isJSXTagName(node);
+            case 71 /* Identifier */:
+                if (node.parent.kind === 165 /* TypeQuery */ || isJSXTagName(node)) {
                     return true;
                 }
-            case 8:
-            case 9:
-            case 99:
+            // falls through
+            case 8 /* NumericLiteral */:
+            case 9 /* StringLiteral */:
+            case 99 /* ThisKeyword */:
                 return isInExpressionContext(node);
             default:
                 return false;
@@ -7652,47 +8948,47 @@ var ts;
     function isInExpressionContext(node) {
         var parent = node.parent;
         switch (parent.kind) {
-            case 232:
-            case 149:
-            case 152:
-            case 151:
-            case 273:
-            case 270:
-            case 182:
+            case 232 /* VariableDeclaration */:
+            case 149 /* Parameter */:
+            case 152 /* PropertyDeclaration */:
+            case 151 /* PropertySignature */:
+            case 273 /* EnumMember */:
+            case 270 /* PropertyAssignment */:
+            case 182 /* BindingElement */:
                 return parent.initializer === node;
-            case 216:
-            case 217:
-            case 218:
-            case 219:
-            case 225:
-            case 226:
-            case 227:
-            case 266:
-            case 229:
+            case 216 /* ExpressionStatement */:
+            case 217 /* IfStatement */:
+            case 218 /* DoStatement */:
+            case 219 /* WhileStatement */:
+            case 225 /* ReturnStatement */:
+            case 226 /* WithStatement */:
+            case 227 /* SwitchStatement */:
+            case 266 /* CaseClause */:
+            case 229 /* ThrowStatement */:
                 return parent.expression === node;
-            case 220:
+            case 220 /* ForStatement */:
                 var forStatement = parent;
-                return (forStatement.initializer === node && forStatement.initializer.kind !== 233) ||
+                return (forStatement.initializer === node && forStatement.initializer.kind !== 233 /* VariableDeclarationList */) ||
                     forStatement.condition === node ||
                     forStatement.incrementor === node;
-            case 221:
-            case 222:
+            case 221 /* ForInStatement */:
+            case 222 /* ForOfStatement */:
                 var forInStatement = parent;
-                return (forInStatement.initializer === node && forInStatement.initializer.kind !== 233) ||
+                return (forInStatement.initializer === node && forInStatement.initializer.kind !== 233 /* VariableDeclarationList */) ||
                     forInStatement.expression === node;
-            case 190:
-            case 208:
+            case 190 /* TypeAssertionExpression */:
+            case 208 /* AsExpression */:
                 return node === parent.expression;
-            case 211:
+            case 211 /* TemplateSpan */:
                 return node === parent.expression;
-            case 147:
+            case 147 /* ComputedPropertyName */:
                 return node === parent.expression;
-            case 150:
-            case 265:
-            case 264:
-            case 272:
+            case 150 /* Decorator */:
+            case 265 /* JsxExpression */:
+            case 264 /* JsxSpreadAttribute */:
+            case 272 /* SpreadAssignment */:
                 return true;
-            case 207:
+            case 207 /* ExpressionWithTypeArguments */:
                 return parent.expression === node && isExpressionWithTypeArgumentsInClassExtendsClause(parent);
             default:
                 return isExpressionNode(parent);
@@ -7700,7 +8996,7 @@ var ts;
     }
     ts.isInExpressionContext = isInExpressionContext;
     function isExternalModuleImportEqualsDeclaration(node) {
-        return node.kind === 243 && node.moduleReference.kind === 254;
+        return node.kind === 243 /* ImportEqualsDeclaration */ && node.moduleReference.kind === 254 /* ExternalModuleReference */;
     }
     ts.isExternalModuleImportEqualsDeclaration = isExternalModuleImportEqualsDeclaration;
     function getExternalModuleImportEqualsDeclarationExpression(node) {
@@ -7709,7 +9005,7 @@ var ts;
     }
     ts.getExternalModuleImportEqualsDeclarationExpression = getExternalModuleImportEqualsDeclarationExpression;
     function isInternalModuleImportEqualsDeclaration(node) {
-        return node.kind === 243 && node.moduleReference.kind !== 254;
+        return node.kind === 243 /* ImportEqualsDeclaration */ && node.moduleReference.kind !== 254 /* ExternalModuleReference */;
     }
     ts.isInternalModuleImportEqualsDeclaration = isInternalModuleImportEqualsDeclaration;
     function isSourceFileJavaScript(file) {
@@ -7721,15 +9017,15 @@ var ts;
     }
     ts.isSourceFileNotJavaScript = isSourceFileNotJavaScript;
     function isInJavaScriptFile(node) {
-        return !!node && !!(node.flags & 65536);
+        return !!node && !!(node.flags & 65536 /* JavaScriptFile */);
     }
     ts.isInJavaScriptFile = isInJavaScriptFile;
     function isInJsonFile(node) {
-        return !!node && !!(node.flags & 16777216);
+        return !!node && !!(node.flags & 16777216 /* JsonFile */);
     }
     ts.isInJsonFile = isInJsonFile;
     function isInJSDoc(node) {
-        return !!node && !!(node.flags & 2097152);
+        return !!node && !!(node.flags & 2097152 /* JSDoc */);
     }
     ts.isInJSDoc = isInJSDoc;
     function isJSDocIndexSignature(node) {
@@ -7737,15 +9033,15 @@ var ts;
             ts.isIdentifier(node.typeName) &&
             node.typeName.escapedText === "Object" &&
             node.typeArguments && node.typeArguments.length === 2 &&
-            (node.typeArguments[0].kind === 137 || node.typeArguments[0].kind === 134);
+            (node.typeArguments[0].kind === 137 /* StringKeyword */ || node.typeArguments[0].kind === 134 /* NumberKeyword */);
     }
     ts.isJSDocIndexSignature = isJSDocIndexSignature;
     function isRequireCall(callExpression, checkArgumentIsStringLiteralLike) {
-        if (callExpression.kind !== 187) {
+        if (callExpression.kind !== 187 /* CallExpression */) {
             return false;
         }
         var _a = callExpression, expression = _a.expression, args = _a.arguments;
-        if (expression.kind !== 71 || expression.escapedText !== "require") {
+        if (expression.kind !== 71 /* Identifier */ || expression.escapedText !== "require") {
             return false;
         }
         if (args.length !== 1) {
@@ -7756,11 +9052,11 @@ var ts;
     }
     ts.isRequireCall = isRequireCall;
     function isSingleOrDoubleQuote(charCode) {
-        return charCode === 39 || charCode === 34;
+        return charCode === 39 /* singleQuote */ || charCode === 34 /* doubleQuote */;
     }
     ts.isSingleOrDoubleQuote = isSingleOrDoubleQuote;
     function isStringDoubleQuoted(str, sourceFile) {
-        return getSourceTextOfNodeFromSourceFile(sourceFile, str).charCodeAt(0) === 34;
+        return getSourceTextOfNodeFromSourceFile(sourceFile, str).charCodeAt(0) === 34 /* doubleQuote */;
     }
     ts.isStringDoubleQuoted = isStringDoubleQuoted;
     function getDeclarationOfJSInitializer(node) {
@@ -7773,16 +9069,16 @@ var ts;
             name = node.parent.name;
             decl = node.parent;
         }
-        else if (ts.isBinaryExpression(node.parent) && node.parent.operatorToken.kind === 58 && node.parent.right === node) {
+        else if (ts.isBinaryExpression(node.parent) && node.parent.operatorToken.kind === 58 /* EqualsToken */ && node.parent.right === node) {
             name = node.parent.left;
             decl = name;
         }
-        else if (ts.isBinaryExpression(node.parent) && node.parent.operatorToken.kind === 54) {
+        else if (ts.isBinaryExpression(node.parent) && node.parent.operatorToken.kind === 54 /* BarBarToken */) {
             if (ts.isVariableDeclaration(node.parent.parent) && node.parent.parent.initializer === node.parent) {
                 name = node.parent.parent.name;
                 decl = node.parent.parent;
             }
-            else if (ts.isBinaryExpression(node.parent.parent) && node.parent.parent.operatorToken.kind === 58 && node.parent.parent.right === node.parent) {
+            else if (ts.isBinaryExpression(node.parent.parent) && node.parent.parent.operatorToken.kind === 58 /* EqualsToken */ && node.parent.parent.right === node.parent) {
                 name = node.parent.parent.left;
                 decl = name;
             }
@@ -7796,31 +9092,46 @@ var ts;
         return decl;
     }
     ts.getDeclarationOfJSInitializer = getDeclarationOfJSInitializer;
+    /** Get the initializer, taking into account defaulted Javascript initializers */
     function getEffectiveInitializer(node) {
         if (isInJavaScriptFile(node) && node.initializer &&
-            ts.isBinaryExpression(node.initializer) && node.initializer.operatorToken.kind === 54 &&
+            ts.isBinaryExpression(node.initializer) && node.initializer.operatorToken.kind === 54 /* BarBarToken */ &&
             node.name && isEntityNameExpression(node.name) && isSameEntityName(node.name, node.initializer.left)) {
             return node.initializer.right;
         }
         return node.initializer;
     }
     ts.getEffectiveInitializer = getEffectiveInitializer;
+    /**
+     * Get the assignment 'initializer' -- the righthand side-- when the initializer is container-like (See getJavascriptInitializer).
+     * We treat the right hand side of assignments with container-like initalizers as declarations.
+     */
     function getAssignedJavascriptInitializer(node) {
-        if (node && node.parent && ts.isBinaryExpression(node.parent) && node.parent.operatorToken.kind === 58) {
+        if (node && node.parent && ts.isBinaryExpression(node.parent) && node.parent.operatorToken.kind === 58 /* EqualsToken */) {
             var isPrototypeAssignment = isPrototypeAccess(node.parent.left);
             return getJavascriptInitializer(node.parent.right, isPrototypeAssignment) ||
                 getDefaultedJavascriptInitializer(node.parent.left, node.parent.right, isPrototypeAssignment);
         }
     }
     ts.getAssignedJavascriptInitializer = getAssignedJavascriptInitializer;
+    /**
+     * Recognized Javascript container-like initializers are:
+     * 1. (function() {})() -- IIFEs
+     * 2. function() { } -- Function expressions
+     * 3. class { } -- Class expressions
+     * 4. {} -- Empty object literals
+     * 5. { ... } -- Non-empty object literals, when used to initialize a prototype, like `C.prototype = { m() { } }`
+     *
+     * This function returns the provided initializer, or undefined if it is not valid.
+     */
     function getJavascriptInitializer(initializer, isPrototypeAssignment) {
         if (ts.isCallExpression(initializer)) {
             var e = skipParentheses(initializer.expression);
-            return e.kind === 192 || e.kind === 193 ? initializer : undefined;
+            return e.kind === 192 /* FunctionExpression */ || e.kind === 193 /* ArrowFunction */ ? initializer : undefined;
         }
-        if (initializer.kind === 192 ||
-            initializer.kind === 205 ||
-            initializer.kind === 193) {
+        if (initializer.kind === 192 /* FunctionExpression */ ||
+            initializer.kind === 205 /* ClassExpression */ ||
+            initializer.kind === 193 /* ArrowFunction */) {
             return initializer;
         }
         if (ts.isObjectLiteralExpression(initializer) && (initializer.properties.length === 0 || isPrototypeAssignment)) {
@@ -7828,23 +9139,32 @@ var ts;
         }
     }
     ts.getJavascriptInitializer = getJavascriptInitializer;
+    /**
+     * A defaulted Javascript initializer matches the pattern
+     * `Lhs = Lhs || JavascriptInitializer`
+     * or `var Lhs = Lhs || JavascriptInitializer`
+     *
+     * The second Lhs is required to be the same as the first except that it may be prefixed with
+     * 'window.', 'global.' or 'self.' The second Lhs is otherwise ignored by the binder and checker.
+     */
     function getDefaultedJavascriptInitializer(name, initializer, isPrototypeAssignment) {
-        var e = ts.isBinaryExpression(initializer) && initializer.operatorToken.kind === 54 && getJavascriptInitializer(initializer.right, isPrototypeAssignment);
+        var e = ts.isBinaryExpression(initializer) && initializer.operatorToken.kind === 54 /* BarBarToken */ && getJavascriptInitializer(initializer.right, isPrototypeAssignment);
         if (e && isSameEntityName(name, initializer.left)) {
             return e;
         }
     }
     function isDefaultedJavascriptInitializer(node) {
         var name = ts.isVariableDeclaration(node.parent) ? node.parent.name :
-            ts.isBinaryExpression(node.parent) && node.parent.operatorToken.kind === 58 ? node.parent.left :
+            ts.isBinaryExpression(node.parent) && node.parent.operatorToken.kind === 58 /* EqualsToken */ ? node.parent.left :
                 undefined;
         return name && getJavascriptInitializer(node.right, isPrototypeAccess(name)) && isEntityNameExpression(name) && isSameEntityName(name, node.left);
     }
     ts.isDefaultedJavascriptInitializer = isDefaultedJavascriptInitializer;
+    /** Given a Javascript initializer, return the outer name. That is, the lhs of the assignment or the declaration name. */
     function getOuterNameOfJsInitializer(node) {
         if (ts.isBinaryExpression(node.parent)) {
-            var parent = (node.parent.operatorToken.kind === 54 && ts.isBinaryExpression(node.parent.parent)) ? node.parent.parent : node.parent;
-            if (parent.operatorToken.kind === 58 && ts.isIdentifier(parent.left)) {
+            var parent = (node.parent.operatorToken.kind === 54 /* BarBarToken */ && ts.isBinaryExpression(node.parent.parent)) ? node.parent.parent : node.parent;
+            if (parent.operatorToken.kind === 58 /* EqualsToken */ && ts.isIdentifier(parent.left)) {
                 return parent.left;
             }
         }
@@ -7853,12 +9173,21 @@ var ts;
         }
     }
     ts.getOuterNameOfJsInitializer = getOuterNameOfJsInitializer;
+    /**
+     * Is the 'declared' name the same as the one in the initializer?
+     * @return true for identical entity names, as well as ones where the initializer is prefixed with
+     * 'window', 'self' or 'global'. For example:
+     *
+     * var my = my || {}
+     * var min = window.min || {}
+     * my.app = self.my.app || class { }
+     */
     function isSameEntityName(name, initializer) {
         if (ts.isIdentifier(name) && ts.isIdentifier(initializer)) {
             return name.escapedText === initializer.escapedText;
         }
         if (ts.isIdentifier(name) && ts.isPropertyAccessExpression(initializer)) {
-            return (initializer.expression.kind === 99 ||
+            return (initializer.expression.kind === 99 /* ThisKeyword */ ||
                 ts.isIdentifier(initializer.expression) &&
                     (initializer.expression.escapedText === "window" ||
                         initializer.expression.escapedText === "self" ||
@@ -7871,7 +9200,7 @@ var ts;
         return false;
     }
     function getRightMostAssignedExpression(node) {
-        while (isAssignmentExpression(node, true)) {
+        while (isAssignmentExpression(node, /*excludeCompoundAssignements*/ true)) {
             node = node.right;
         }
         return node;
@@ -7885,25 +9214,30 @@ var ts;
         return ts.isPropertyAccessExpression(node) && ts.isIdentifier(node.expression) && node.expression.escapedText === "module" && node.name.escapedText === "exports";
     }
     ts.isModuleExportsPropertyAccessExpression = isModuleExportsPropertyAccessExpression;
+    /// Given a BinaryExpression, returns SpecialPropertyAssignmentKind for the various kinds of property
+    /// assignments we treat as special in the binder
     function getSpecialPropertyAssignmentKind(expr) {
         if (!isInJavaScriptFile(expr) ||
-            expr.operatorToken.kind !== 58 ||
+            expr.operatorToken.kind !== 58 /* EqualsToken */ ||
             !ts.isPropertyAccessExpression(expr.left)) {
-            return 0;
+            return 0 /* None */;
         }
         var lhs = expr.left;
-        if (lhs.expression.kind === 99) {
-            return 4;
+        if (lhs.expression.kind === 99 /* ThisKeyword */) {
+            return 4 /* ThisProperty */;
         }
         else if (ts.isIdentifier(lhs.expression) && lhs.expression.escapedText === "module" && lhs.name.escapedText === "exports") {
-            return 2;
+            // module.exports = expr
+            return 2 /* ModuleExports */;
         }
         else if (isEntityNameExpression(lhs.expression)) {
             if (lhs.name.escapedText === "prototype" && ts.isObjectLiteralExpression(getInitializerOfBinaryExpression(expr))) {
-                return 6;
+                // F.prototype = { ... }
+                return 6 /* Prototype */;
             }
             else if (isPrototypeAccess(lhs.expression)) {
-                return 3;
+                // F.G....prototype.x = expr
+                return 3 /* PrototypeProperty */;
             }
             var nextToLast = lhs;
             while (ts.isPropertyAccessExpression(nextToLast.expression)) {
@@ -7913,11 +9247,13 @@ var ts;
             var id = nextToLast.expression;
             if (id.escapedText === "exports" ||
                 id.escapedText === "module" && nextToLast.name.escapedText === "exports") {
-                return 1;
+                // exports.name = expr OR module.exports.name = expr
+                return 1 /* ExportsProperty */;
             }
-            return 5;
+            // F.G...x = expr
+            return 5 /* Property */;
         }
-        return 0;
+        return 0 /* None */;
     }
     ts.getSpecialPropertyAssignmentKind = getSpecialPropertyAssignmentKind;
     function getInitializerOfBinaryExpression(expr) {
@@ -7928,12 +9264,12 @@ var ts;
     }
     ts.getInitializerOfBinaryExpression = getInitializerOfBinaryExpression;
     function isPrototypePropertyAssignment(node) {
-        return ts.isBinaryExpression(node) && getSpecialPropertyAssignmentKind(node) === 3;
+        return ts.isBinaryExpression(node) && getSpecialPropertyAssignmentKind(node) === 3 /* PrototypeProperty */;
     }
     ts.isPrototypePropertyAssignment = isPrototypePropertyAssignment;
     function isSpecialPropertyDeclaration(expr) {
         return isInJavaScriptFile(expr) &&
-            expr.parent && expr.parent.kind === 216 &&
+            expr.parent && expr.parent.kind === 216 /* ExpressionStatement */ &&
             !!ts.getJSDocTypeTag(expr.parent);
     }
     ts.isSpecialPropertyDeclaration = isSpecialPropertyDeclaration;
@@ -7943,14 +9279,14 @@ var ts;
     ts.importFromModuleSpecifier = importFromModuleSpecifier;
     function tryGetImportFromModuleSpecifier(node) {
         switch (node.parent.kind) {
-            case 244:
-            case 250:
+            case 244 /* ImportDeclaration */:
+            case 250 /* ExportDeclaration */:
                 return node.parent;
-            case 254:
+            case 254 /* ExternalModuleReference */:
                 return node.parent.parent;
-            case 187:
+            case 187 /* CallExpression */:
                 return node.parent;
-            case 178:
+            case 178 /* LiteralType */:
                 ts.Debug.assert(ts.isStringLiteral(node));
                 return ts.tryCast(node.parent.parent, ts.isImportTypeNode);
             default:
@@ -7960,12 +9296,12 @@ var ts;
     ts.tryGetImportFromModuleSpecifier = tryGetImportFromModuleSpecifier;
     function getExternalModuleName(node) {
         switch (node.kind) {
-            case 244:
-            case 250:
+            case 244 /* ImportDeclaration */:
+            case 250 /* ExportDeclaration */:
                 return node.moduleSpecifier;
-            case 243:
-                return node.moduleReference.kind === 254 ? node.moduleReference.expression : undefined;
-            case 179:
+            case 243 /* ImportEqualsDeclaration */:
+                return node.moduleReference.kind === 254 /* ExternalModuleReference */ ? node.moduleReference.expression : undefined;
+            case 179 /* ImportType */:
                 return isLiteralImportTypeNode(node) ? node.argument.literal : undefined;
             default:
                 return ts.Debug.assertNever(node);
@@ -7974,11 +9310,11 @@ var ts;
     ts.getExternalModuleName = getExternalModuleName;
     function getNamespaceDeclarationNode(node) {
         switch (node.kind) {
-            case 244:
+            case 244 /* ImportDeclaration */:
                 return node.importClause && ts.tryCast(node.importClause.namedBindings, ts.isNamespaceImport);
-            case 243:
+            case 243 /* ImportEqualsDeclaration */:
                 return node;
-            case 250:
+            case 250 /* ExportDeclaration */:
                 return undefined;
             default:
                 return ts.Debug.assertNever(node);
@@ -7986,19 +9322,19 @@ var ts;
     }
     ts.getNamespaceDeclarationNode = getNamespaceDeclarationNode;
     function isDefaultImport(node) {
-        return node.kind === 244 && !!node.importClause && !!node.importClause.name;
+        return node.kind === 244 /* ImportDeclaration */ && !!node.importClause && !!node.importClause.name;
     }
     ts.isDefaultImport = isDefaultImport;
     function hasQuestionToken(node) {
         if (node) {
             switch (node.kind) {
-                case 149:
-                case 154:
-                case 153:
-                case 271:
-                case 270:
-                case 152:
-                case 151:
+                case 149 /* Parameter */:
+                case 154 /* MethodDeclaration */:
+                case 153 /* MethodSignature */:
+                case 271 /* ShorthandPropertyAssignment */:
+                case 270 /* PropertyAssignment */:
+                case 152 /* PropertyDeclaration */:
+                case 151 /* PropertySignature */:
                     return node.questionToken !== undefined;
             }
         }
@@ -8006,14 +9342,14 @@ var ts;
     }
     ts.hasQuestionToken = hasQuestionToken;
     function isJSDocConstructSignature(node) {
-        return node.kind === 284 &&
+        return node.kind === 284 /* JSDocFunctionType */ &&
             node.parameters.length > 0 &&
             node.parameters[0].name &&
             node.parameters[0].name.escapedText === "new";
     }
     ts.isJSDocConstructSignature = isJSDocConstructSignature;
     function isJSDocTypeAlias(node) {
-        return node.kind === 297 || node.kind === 292;
+        return node.kind === 297 /* JSDocTypedefTag */ || node.kind === 292 /* JSDocCallbackTag */;
     }
     ts.isJSDocTypeAlias = isJSDocTypeAlias;
     function isTypeAlias(node) {
@@ -8023,27 +9359,27 @@ var ts;
     function getSourceOfAssignment(node) {
         return ts.isExpressionStatement(node) &&
             node.expression && ts.isBinaryExpression(node.expression) &&
-            node.expression.operatorToken.kind === 58
+            node.expression.operatorToken.kind === 58 /* EqualsToken */
             ? node.expression.right
             : undefined;
     }
     function getSourceOfDefaultedAssignment(node) {
         return ts.isExpressionStatement(node) &&
             ts.isBinaryExpression(node.expression) &&
-            getSpecialPropertyAssignmentKind(node.expression) !== 0 &&
+            getSpecialPropertyAssignmentKind(node.expression) !== 0 /* None */ &&
             ts.isBinaryExpression(node.expression.right) &&
-            node.expression.right.operatorToken.kind === 54
+            node.expression.right.operatorToken.kind === 54 /* BarBarToken */
             ? node.expression.right.right
             : undefined;
     }
     function getSingleInitializerOfVariableStatementOrPropertyDeclaration(node) {
         switch (node.kind) {
-            case 214:
+            case 214 /* VariableStatement */:
                 var v = getSingleVariableOfVariableStatement(node);
                 return v && v.initializer;
-            case 152:
+            case 152 /* PropertyDeclaration */:
                 return node.initializer;
-            case 270:
+            case 270 /* PropertyAssignment */:
                 return node.initializer;
         }
     }
@@ -8053,7 +9389,7 @@ var ts;
     function getNestedModuleDeclaration(node) {
         return ts.isModuleDeclaration(node) &&
             node.body &&
-            node.body.kind === 239
+            node.body.kind === 239 /* ModuleDeclaration */
             ? node.body
             : undefined;
     }
@@ -8065,9 +9401,15 @@ var ts;
             var parent = node.parent;
             if (!parent)
                 return;
-            if (parent.kind === 270 || parent.kind === 152 || getNestedModuleDeclaration(parent)) {
+            if (parent.kind === 270 /* PropertyAssignment */ || parent.kind === 152 /* PropertyDeclaration */ || getNestedModuleDeclaration(parent)) {
                 getJSDocCommentsAndTagsWorker(parent);
             }
+            // Try to recognize this pattern when node is initializer of variable declaration and JSDoc comments are on containing variable statement.
+            // /**
+            //   * @param {number} name
+            //   * @returns {number}
+            //   */
+            // var x = function(name) { return name.length; }
             if (parent.parent && (getSingleVariableOfVariableStatement(parent.parent) === node)) {
                 getJSDocCommentsAndTagsWorker(parent.parent);
             }
@@ -8077,12 +9419,13 @@ var ts;
                     getSourceOfDefaultedAssignment(parent.parent.parent))) {
                 getJSDocCommentsAndTagsWorker(parent.parent.parent);
             }
-            if (ts.isBinaryExpression(node) && node.operatorToken.kind === 58 ||
-                ts.isBinaryExpression(parent) && parent.operatorToken.kind === 58 ||
-                node.kind === 185 && node.parent && node.parent.kind === 216) {
+            if (ts.isBinaryExpression(node) && node.operatorToken.kind === 58 /* EqualsToken */ ||
+                ts.isBinaryExpression(parent) && parent.operatorToken.kind === 58 /* EqualsToken */ ||
+                node.kind === 185 /* PropertyAccessExpression */ && node.parent && node.parent.kind === 216 /* ExpressionStatement */) {
                 getJSDocCommentsAndTagsWorker(parent);
             }
-            if (node.kind === 149) {
+            // Pull parameter comments from declaring function as well
+            if (node.kind === 149 /* Parameter */) {
                 result = ts.addRange(result, ts.getJSDocParameterTags(node));
             }
             if (isVariableLike(node) && ts.hasInitializer(node) && node.initializer !== hostNode && ts.hasJSDocNodes(node.initializer)) {
@@ -8094,6 +9437,7 @@ var ts;
         }
     }
     ts.getJSDocCommentsAndTags = getJSDocCommentsAndTags;
+    /** Does the opposite of `getJSDocParameterTags`: given a JSDoc parameter, finds the parameter corresponding to it. */
     function getParameterSymbolFromJSDoc(node) {
         if (node.symbol) {
             return node.symbol;
@@ -8106,7 +9450,7 @@ var ts;
         if (!decl) {
             return undefined;
         }
-        var parameter = ts.find(decl.parameters, function (p) { return p.name.kind === 71 && p.name.escapedText === name; });
+        var parameter = ts.find(decl.parameters, function (p) { return p.name.kind === 71 /* Identifier */ && p.name.escapedText === name; });
         return parameter && parameter.symbol;
     }
     ts.getParameterSymbolFromJSDoc = getParameterSymbolFromJSDoc;
@@ -8125,7 +9469,7 @@ var ts;
     }
     ts.getHostSignatureFromJSDocHost = getHostSignatureFromJSDocHost;
     function getJSDocHost(node) {
-        return ts.Debug.assertDefined(ts.findAncestor(node.parent, ts.isJSDoc)).parent;
+        return ts.Debug.assertDefined(findAncestor(node.parent, ts.isJSDoc)).parent;
     }
     ts.getJSDocHost = getJSDocHost;
     function getTypeParameterFromJsDoc(node) {
@@ -8141,72 +9485,86 @@ var ts;
     ts.hasRestParameter = hasRestParameter;
     function isRestParameter(node) {
         var type = ts.isJSDocParameterTag(node) ? (node.typeExpression && node.typeExpression.type) : node.type;
-        return node.dotDotDotToken !== undefined || !!type && type.kind === 285;
+        return node.dotDotDotToken !== undefined || !!type && type.kind === 285 /* JSDocVariadicType */;
     }
     ts.isRestParameter = isRestParameter;
+    var AssignmentKind;
+    (function (AssignmentKind) {
+        AssignmentKind[AssignmentKind["None"] = 0] = "None";
+        AssignmentKind[AssignmentKind["Definite"] = 1] = "Definite";
+        AssignmentKind[AssignmentKind["Compound"] = 2] = "Compound";
+    })(AssignmentKind = ts.AssignmentKind || (ts.AssignmentKind = {}));
     function getAssignmentTargetKind(node) {
         var parent = node.parent;
         while (true) {
             switch (parent.kind) {
-                case 200:
+                case 200 /* BinaryExpression */:
                     var binaryOperator = parent.operatorToken.kind;
                     return isAssignmentOperator(binaryOperator) && parent.left === node ?
-                        binaryOperator === 58 ? 1 : 2 :
-                        0;
-                case 198:
-                case 199:
+                        binaryOperator === 58 /* EqualsToken */ ? 1 /* Definite */ : 2 /* Compound */ :
+                        0 /* None */;
+                case 198 /* PrefixUnaryExpression */:
+                case 199 /* PostfixUnaryExpression */:
                     var unaryOperator = parent.operator;
-                    return unaryOperator === 43 || unaryOperator === 44 ? 2 : 0;
-                case 221:
-                case 222:
-                    return parent.initializer === node ? 1 : 0;
-                case 191:
-                case 183:
-                case 204:
-                case 209:
+                    return unaryOperator === 43 /* PlusPlusToken */ || unaryOperator === 44 /* MinusMinusToken */ ? 2 /* Compound */ : 0 /* None */;
+                case 221 /* ForInStatement */:
+                case 222 /* ForOfStatement */:
+                    return parent.initializer === node ? 1 /* Definite */ : 0 /* None */;
+                case 191 /* ParenthesizedExpression */:
+                case 183 /* ArrayLiteralExpression */:
+                case 204 /* SpreadElement */:
+                case 209 /* NonNullExpression */:
                     node = parent;
                     break;
-                case 271:
+                case 271 /* ShorthandPropertyAssignment */:
                     if (parent.name !== node) {
-                        return 0;
+                        return 0 /* None */;
                     }
                     node = parent.parent;
                     break;
-                case 270:
+                case 270 /* PropertyAssignment */:
                     if (parent.name === node) {
-                        return 0;
+                        return 0 /* None */;
                     }
                     node = parent.parent;
                     break;
                 default:
-                    return 0;
+                    return 0 /* None */;
             }
             parent = node.parent;
         }
     }
     ts.getAssignmentTargetKind = getAssignmentTargetKind;
+    // A node is an assignment target if it is on the left hand side of an '=' token, if it is parented by a property
+    // assignment in an object literal that is an assignment target, or if it is parented by an array literal that is
+    // an assignment target. Examples include 'a = xxx', '{ p: a } = xxx', '[{ a }] = xxx'.
+    // (Note that `p` is not a target in the above examples, only `a`.)
     function isAssignmentTarget(node) {
-        return getAssignmentTargetKind(node) !== 0;
+        return getAssignmentTargetKind(node) !== 0 /* None */;
     }
     ts.isAssignmentTarget = isAssignmentTarget;
+    /**
+     * Indicates whether a node could contain a `var` VariableDeclarationList that contributes to
+     * the same `var` declaration scope as the node's parent.
+     */
     function isNodeWithPossibleHoistedDeclaration(node) {
         switch (node.kind) {
-            case 213:
-            case 214:
-            case 226:
-            case 217:
-            case 227:
-            case 241:
-            case 266:
-            case 267:
-            case 228:
-            case 220:
-            case 221:
-            case 222:
-            case 218:
-            case 219:
-            case 230:
-            case 269:
+            case 213 /* Block */:
+            case 214 /* VariableStatement */:
+            case 226 /* WithStatement */:
+            case 217 /* IfStatement */:
+            case 227 /* SwitchStatement */:
+            case 241 /* CaseBlock */:
+            case 266 /* CaseClause */:
+            case 267 /* DefaultClause */:
+            case 228 /* LabeledStatement */:
+            case 220 /* ForStatement */:
+            case 221 /* ForInStatement */:
+            case 222 /* ForOfStatement */:
+            case 218 /* DoStatement */:
+            case 219 /* WhileStatement */:
+            case 230 /* TryStatement */:
+            case 269 /* CatchClause */:
                 return true;
         }
         return false;
@@ -8223,26 +9581,27 @@ var ts;
         return node;
     }
     function walkUpParenthesizedTypes(node) {
-        return walkUp(node, 173);
+        return walkUp(node, 173 /* ParenthesizedType */);
     }
     ts.walkUpParenthesizedTypes = walkUpParenthesizedTypes;
     function walkUpParenthesizedExpressions(node) {
-        return walkUp(node, 191);
+        return walkUp(node, 191 /* ParenthesizedExpression */);
     }
     ts.walkUpParenthesizedExpressions = walkUpParenthesizedExpressions;
     function skipParentheses(node) {
-        while (node.kind === 191) {
+        while (node.kind === 191 /* ParenthesizedExpression */) {
             node = node.expression;
         }
         return node;
     }
     ts.skipParentheses = skipParentheses;
+    // a node is delete target iff. it is PropertyAccessExpression/ElementAccessExpression with parentheses skipped
     function isDeleteTarget(node) {
-        if (node.kind !== 185 && node.kind !== 186) {
+        if (node.kind !== 185 /* PropertyAccessExpression */ && node.kind !== 186 /* ElementAccessExpression */) {
             return false;
         }
         node = walkUpParenthesizedExpressions(node.parent);
-        return node && node.kind === 194;
+        return node && node.kind === 194 /* DeleteExpression */;
     }
     ts.isDeleteTarget = isDeleteTarget;
     function isNodeDescendantOf(node, ancestor) {
@@ -8254,15 +9613,17 @@ var ts;
         return false;
     }
     ts.isNodeDescendantOf = isNodeDescendantOf;
+    // True if `name` is the name of a declaration node
     function isDeclarationName(name) {
         return !ts.isSourceFile(name) && !ts.isBindingPattern(name) && ts.isDeclaration(name.parent) && name.parent.name === name;
     }
     ts.isDeclarationName = isDeclarationName;
+    // See GH#16030
     function isAnyDeclarationName(name) {
         switch (name.kind) {
-            case 71:
-            case 9:
-            case 8: {
+            case 71 /* Identifier */:
+            case 9 /* StringLiteral */:
+            case 8 /* NumericLiteral */: {
                 var parent = name.parent;
                 if (ts.isDeclaration(parent)) {
                     return parent.name === name;
@@ -8273,7 +9634,7 @@ var ts;
                 }
                 else {
                     var binExp = name.parent.parent;
-                    return ts.isBinaryExpression(binExp) && getSpecialPropertyAssignmentKind(binExp) !== 0 && ts.getNameOfDeclaration(binExp) === name;
+                    return ts.isBinaryExpression(binExp) && getSpecialPropertyAssignmentKind(binExp) !== 0 /* None */ && ts.getNameOfDeclaration(binExp) === name;
                 }
             }
             default:
@@ -8282,51 +9643,64 @@ var ts;
     }
     ts.isAnyDeclarationName = isAnyDeclarationName;
     function isLiteralComputedPropertyDeclarationName(node) {
-        return (node.kind === 9 || node.kind === 8) &&
-            node.parent.kind === 147 &&
+        return (node.kind === 9 /* StringLiteral */ || node.kind === 8 /* NumericLiteral */) &&
+            node.parent.kind === 147 /* ComputedPropertyName */ &&
             ts.isDeclaration(node.parent.parent);
     }
     ts.isLiteralComputedPropertyDeclarationName = isLiteralComputedPropertyDeclarationName;
+    // Return true if the given identifier is classified as an IdentifierName
     function isIdentifierName(node) {
         var parent = node.parent;
         switch (parent.kind) {
-            case 152:
-            case 151:
-            case 154:
-            case 153:
-            case 156:
-            case 157:
-            case 273:
-            case 270:
-            case 185:
+            case 152 /* PropertyDeclaration */:
+            case 151 /* PropertySignature */:
+            case 154 /* MethodDeclaration */:
+            case 153 /* MethodSignature */:
+            case 156 /* GetAccessor */:
+            case 157 /* SetAccessor */:
+            case 273 /* EnumMember */:
+            case 270 /* PropertyAssignment */:
+            case 185 /* PropertyAccessExpression */:
+                // Name in member declaration or property name in property access
                 return parent.name === node;
-            case 146:
+            case 146 /* QualifiedName */:
+                // Name on right hand side of dot in a type query or type reference
                 if (parent.right === node) {
-                    while (parent.kind === 146) {
+                    while (parent.kind === 146 /* QualifiedName */) {
                         parent = parent.parent;
                     }
-                    return parent.kind === 165 || parent.kind === 162;
+                    return parent.kind === 165 /* TypeQuery */ || parent.kind === 162 /* TypeReference */;
                 }
                 return false;
-            case 182:
-            case 248:
+            case 182 /* BindingElement */:
+            case 248 /* ImportSpecifier */:
+                // Property name in binding element or import specifier
                 return parent.propertyName === node;
-            case 252:
-            case 262:
+            case 252 /* ExportSpecifier */:
+            case 262 /* JsxAttribute */:
+                // Any name in an export specifier or JSX Attribute
                 return true;
         }
         return false;
     }
     ts.isIdentifierName = isIdentifierName;
+    // An alias symbol is created by one of the following declarations:
+    // import <symbol> = ...
+    // import <symbol> from ...
+    // import * as <symbol> from ...
+    // import { x as <symbol> } from ...
+    // export { x as <symbol> } from ...
+    // export = <EntityNameExpression>
+    // export default <EntityNameExpression>
     function isAliasSymbolDeclaration(node) {
-        return node.kind === 243 ||
-            node.kind === 242 ||
-            node.kind === 245 && !!node.name ||
-            node.kind === 246 ||
-            node.kind === 248 ||
-            node.kind === 252 ||
-            node.kind === 249 && exportAssignmentIsAlias(node) ||
-            ts.isBinaryExpression(node) && getSpecialPropertyAssignmentKind(node) === 2;
+        return node.kind === 243 /* ImportEqualsDeclaration */ ||
+            node.kind === 242 /* NamespaceExportDeclaration */ ||
+            node.kind === 245 /* ImportClause */ && !!node.name ||
+            node.kind === 246 /* NamespaceImport */ ||
+            node.kind === 248 /* ImportSpecifier */ ||
+            node.kind === 252 /* ExportSpecifier */ ||
+            node.kind === 249 /* ExportAssignment */ && exportAssignmentIsAlias(node) ||
+            ts.isBinaryExpression(node) && getSpecialPropertyAssignmentKind(node) === 2 /* ModuleExports */;
     }
     ts.isAliasSymbolDeclaration = isAliasSymbolDeclaration;
     function exportAssignmentIsAlias(node) {
@@ -8335,15 +9709,16 @@ var ts;
     }
     ts.exportAssignmentIsAlias = exportAssignmentIsAlias;
     function getClassExtendsHeritageClauseElement(node) {
-        var heritageClause = getHeritageClause(node.heritageClauses, 85);
+        var heritageClause = getHeritageClause(node.heritageClauses, 85 /* ExtendsKeyword */);
         return heritageClause && heritageClause.types.length > 0 ? heritageClause.types[0] : undefined;
     }
     ts.getClassExtendsHeritageClauseElement = getClassExtendsHeritageClauseElement;
     function getClassImplementsHeritageClauseElements(node) {
-        var heritageClause = getHeritageClause(node.heritageClauses, 108);
+        var heritageClause = getHeritageClause(node.heritageClauses, 108 /* ImplementsKeyword */);
         return heritageClause ? heritageClause.types : undefined;
     }
     ts.getClassImplementsHeritageClauseElements = getClassImplementsHeritageClauseElements;
+    /** Returns the node in an `extends` or `implements` clause of a class or interface. */
     function getAllSuperTypeNodes(node) {
         return ts.isInterfaceDeclaration(node) ? getInterfaceBaseTypeNodes(node) || ts.emptyArray
             : ts.isClassLike(node) ? ts.concatenate(ts.singleElementArray(getClassExtendsHeritageClauseElement(node)), getClassImplementsHeritageClauseElements(node)) || ts.emptyArray
@@ -8351,7 +9726,7 @@ var ts;
     }
     ts.getAllSuperTypeNodes = getAllSuperTypeNodes;
     function getInterfaceBaseTypeNodes(node) {
-        var heritageClause = getHeritageClause(node.heritageClauses, 85);
+        var heritageClause = getHeritageClause(node.heritageClauses, 85 /* ExtendsKeyword */);
         return heritageClause ? heritageClause.types : undefined;
     }
     ts.getInterfaceBaseTypeNodes = getInterfaceBaseTypeNodes;
@@ -8385,11 +9760,11 @@ var ts;
     }
     ts.getAncestor = getAncestor;
     function isKeyword(token) {
-        return 72 <= token && token <= 145;
+        return 72 /* FirstKeyword */ <= token && token <= 145 /* LastKeyword */;
     }
     ts.isKeyword = isKeyword;
     function isContextualKeyword(token) {
-        return 117 <= token && token <= 145;
+        return 117 /* FirstContextualKeyword */ <= token && token <= 145 /* LastContextualKeyword */;
     }
     ts.isContextualKeyword = isContextualKeyword;
     function isNonContextualKeyword(token) {
@@ -8402,80 +9777,101 @@ var ts;
     }
     ts.isStringANonContextualKeyword = isStringANonContextualKeyword;
     function isTrivia(token) {
-        return 2 <= token && token <= 7;
+        return 2 /* FirstTriviaToken */ <= token && token <= 7 /* LastTriviaToken */;
     }
     ts.isTrivia = isTrivia;
+    var FunctionFlags;
+    (function (FunctionFlags) {
+        FunctionFlags[FunctionFlags["Normal"] = 0] = "Normal";
+        FunctionFlags[FunctionFlags["Generator"] = 1] = "Generator";
+        FunctionFlags[FunctionFlags["Async"] = 2] = "Async";
+        FunctionFlags[FunctionFlags["Invalid"] = 4] = "Invalid";
+        FunctionFlags[FunctionFlags["AsyncGenerator"] = 3] = "AsyncGenerator";
+    })(FunctionFlags = ts.FunctionFlags || (ts.FunctionFlags = {}));
     function getFunctionFlags(node) {
         if (!node) {
-            return 4;
+            return 4 /* Invalid */;
         }
-        var flags = 0;
+        var flags = 0 /* Normal */;
         switch (node.kind) {
-            case 234:
-            case 192:
-            case 154:
+            case 234 /* FunctionDeclaration */:
+            case 192 /* FunctionExpression */:
+            case 154 /* MethodDeclaration */:
                 if (node.asteriskToken) {
-                    flags |= 1;
+                    flags |= 1 /* Generator */;
                 }
-            case 193:
-                if (hasModifier(node, 256)) {
-                    flags |= 2;
+            // falls through
+            case 193 /* ArrowFunction */:
+                if (hasModifier(node, 256 /* Async */)) {
+                    flags |= 2 /* Async */;
                 }
                 break;
         }
         if (!node.body) {
-            flags |= 4;
+            flags |= 4 /* Invalid */;
         }
         return flags;
     }
     ts.getFunctionFlags = getFunctionFlags;
     function isAsyncFunction(node) {
         switch (node.kind) {
-            case 234:
-            case 192:
-            case 193:
-            case 154:
+            case 234 /* FunctionDeclaration */:
+            case 192 /* FunctionExpression */:
+            case 193 /* ArrowFunction */:
+            case 154 /* MethodDeclaration */:
                 return node.body !== undefined
                     && node.asteriskToken === undefined
-                    && hasModifier(node, 256);
+                    && hasModifier(node, 256 /* Async */);
         }
         return false;
     }
     ts.isAsyncFunction = isAsyncFunction;
     function isStringOrNumericLiteral(node) {
         var kind = node.kind;
-        return kind === 9
-            || kind === 8;
+        return kind === 9 /* StringLiteral */
+            || kind === 8 /* NumericLiteral */;
     }
     ts.isStringOrNumericLiteral = isStringOrNumericLiteral;
+    /**
+     * A declaration has a dynamic name if both of the following are true:
+     *   1. The declaration has a computed property name
+     *   2. The computed name is *not* expressed as Symbol.<name>, where name
+     *      is a property of the Symbol constructor that denotes a built in
+     *      Symbol.
+     */
     function hasDynamicName(declaration) {
         var name = ts.getNameOfDeclaration(declaration);
         return !!name && isDynamicName(name);
     }
     ts.hasDynamicName = hasDynamicName;
     function isDynamicName(name) {
-        return name.kind === 147 &&
+        return name.kind === 147 /* ComputedPropertyName */ &&
             !isStringOrNumericLiteral(name.expression) &&
             !isWellKnownSymbolSyntactically(name.expression);
     }
     ts.isDynamicName = isDynamicName;
+    /**
+     * Checks if the expression is of the form:
+     *    Symbol.name
+     * where Symbol is literally the word "Symbol", and name is any identifierName
+     */
     function isWellKnownSymbolSyntactically(node) {
         return ts.isPropertyAccessExpression(node) && isESSymbolIdentifier(node.expression);
     }
     ts.isWellKnownSymbolSyntactically = isWellKnownSymbolSyntactically;
     function getPropertyNameForPropertyNameNode(name) {
-        if (name.kind === 71) {
+        if (name.kind === 71 /* Identifier */) {
             return name.escapedText;
         }
-        if (name.kind === 9 || name.kind === 8) {
+        if (name.kind === 9 /* StringLiteral */ || name.kind === 8 /* NumericLiteral */) {
             return escapeLeadingUnderscores(name.text);
         }
-        if (name.kind === 147) {
+        if (name.kind === 147 /* ComputedPropertyName */) {
             var nameExpression = name.expression;
             if (isWellKnownSymbolSyntactically(nameExpression)) {
                 return getPropertyNameForKnownSymbolName(ts.idText(nameExpression.name));
             }
-            else if (nameExpression.kind === 9 || nameExpression.kind === 8) {
+            else if (nameExpression.kind === 9 /* StringLiteral */ || nameExpression.kind === 8 /* NumericLiteral */) {
                 return escapeLeadingUnderscores(nameExpression.text);
             }
         }
@@ -8484,10 +9880,10 @@ var ts;
     ts.getPropertyNameForPropertyNameNode = getPropertyNameForPropertyNameNode;
     function isPropertyNameLiteral(node) {
         switch (node.kind) {
-            case 71:
-            case 9:
-            case 13:
-            case 8:
+            case 71 /* Identifier */:
+            case 9 /* StringLiteral */:
+            case 13 /* NoSubstitutionTemplateLiteral */:
+            case 8 /* NumericLiteral */:
                 return true;
             default:
                 return false;
@@ -8495,11 +9891,11 @@ var ts;
     }
     ts.isPropertyNameLiteral = isPropertyNameLiteral;
     function getTextOfIdentifierOrLiteral(node) {
-        return node.kind === 71 ? ts.idText(node) : node.text;
+        return node.kind === 71 /* Identifier */ ? ts.idText(node) : node.text;
     }
     ts.getTextOfIdentifierOrLiteral = getTextOfIdentifierOrLiteral;
     function getEscapedTextOfIdentifierOrLiteral(node) {
-        return node.kind === 71 ? node.escapedText : escapeLeadingUnderscores(node.text);
+        return node.kind === 71 /* Identifier */ ? node.escapedText : escapeLeadingUnderscores(node.text);
     }
     ts.getEscapedTextOfIdentifierOrLiteral = getEscapedTextOfIdentifierOrLiteral;
     function getPropertyNameForKnownSymbolName(symbolName) {
@@ -8510,8 +9906,11 @@ var ts;
         return ts.startsWith(symbol.escapedName, "__@");
     }
     ts.isKnownSymbol = isKnownSymbol;
+    /**
+     * Includes the word "Symbol" with unicode escapes
+     */
     function isESSymbolIdentifier(node) {
-        return node.kind === 71 && node.escapedText === "Symbol";
+        return node.kind === 71 /* Identifier */ && node.escapedText === "Symbol";
     }
     ts.isESSymbolIdentifier = isESSymbolIdentifier;
     function isPushOrUnshiftIdentifier(node) {
@@ -8520,11 +9919,11 @@ var ts;
     ts.isPushOrUnshiftIdentifier = isPushOrUnshiftIdentifier;
     function isParameterDeclaration(node) {
         var root = getRootDeclaration(node);
-        return root.kind === 149;
+        return root.kind === 149 /* Parameter */;
     }
     ts.isParameterDeclaration = isParameterDeclaration;
     function getRootDeclaration(node) {
-        while (node.kind === 182) {
+        while (node.kind === 182 /* BindingElement */) {
             node = node.parent.parent;
         }
         return node;
@@ -8532,15 +9931,15 @@ var ts;
     ts.getRootDeclaration = getRootDeclaration;
     function nodeStartsNewLexicalEnvironment(node) {
         var kind = node.kind;
-        return kind === 155
-            || kind === 192
-            || kind === 234
-            || kind === 193
-            || kind === 154
-            || kind === 156
-            || kind === 157
-            || kind === 239
-            || kind === 274;
+        return kind === 155 /* Constructor */
+            || kind === 192 /* FunctionExpression */
+            || kind === 234 /* FunctionDeclaration */
+            || kind === 193 /* ArrowFunction */
+            || kind === 154 /* MethodDeclaration */
+            || kind === 156 /* GetAccessor */
+            || kind === 157 /* SetAccessor */
+            || kind === 239 /* ModuleDeclaration */
+            || kind === 274 /* SourceFile */;
     }
     ts.nodeStartsNewLexicalEnvironment = nodeStartsNewLexicalEnvironment;
     function nodeIsSynthesized(range) {
@@ -8552,57 +9951,62 @@ var ts;
         return ts.getParseTreeNode(sourceFile, ts.isSourceFile) || sourceFile;
     }
     ts.getOriginalSourceFile = getOriginalSourceFile;
+    var Associativity;
+    (function (Associativity) {
+        Associativity[Associativity["Left"] = 0] = "Left";
+        Associativity[Associativity["Right"] = 1] = "Right";
+    })(Associativity = ts.Associativity || (ts.Associativity = {}));
     function getExpressionAssociativity(expression) {
         var operator = getOperator(expression);
-        var hasArguments = expression.kind === 188 && expression.arguments !== undefined;
+        var hasArguments = expression.kind === 188 /* NewExpression */ && expression.arguments !== undefined;
         return getOperatorAssociativity(expression.kind, operator, hasArguments);
     }
     ts.getExpressionAssociativity = getExpressionAssociativity;
     function getOperatorAssociativity(kind, operator, hasArguments) {
         switch (kind) {
-            case 188:
-                return hasArguments ? 0 : 1;
-            case 198:
-            case 195:
-            case 196:
-            case 194:
-            case 197:
-            case 201:
-            case 203:
-                return 1;
-            case 200:
+            case 188 /* NewExpression */:
+                return hasArguments ? 0 /* Left */ : 1 /* Right */;
+            case 198 /* PrefixUnaryExpression */:
+            case 195 /* TypeOfExpression */:
+            case 196 /* VoidExpression */:
+            case 194 /* DeleteExpression */:
+            case 197 /* AwaitExpression */:
+            case 201 /* ConditionalExpression */:
+            case 203 /* YieldExpression */:
+                return 1 /* Right */;
+            case 200 /* BinaryExpression */:
                 switch (operator) {
-                    case 40:
-                    case 58:
-                    case 59:
-                    case 60:
-                    case 62:
-                    case 61:
-                    case 63:
-                    case 64:
-                    case 65:
-                    case 66:
-                    case 67:
-                    case 68:
-                    case 70:
-                    case 69:
-                        return 1;
+                    case 40 /* AsteriskAsteriskToken */:
+                    case 58 /* EqualsToken */:
+                    case 59 /* PlusEqualsToken */:
+                    case 60 /* MinusEqualsToken */:
+                    case 62 /* AsteriskAsteriskEqualsToken */:
+                    case 61 /* AsteriskEqualsToken */:
+                    case 63 /* SlashEqualsToken */:
+                    case 64 /* PercentEqualsToken */:
+                    case 65 /* LessThanLessThanEqualsToken */:
+                    case 66 /* GreaterThanGreaterThanEqualsToken */:
+                    case 67 /* GreaterThanGreaterThanGreaterThanEqualsToken */:
+                    case 68 /* AmpersandEqualsToken */:
+                    case 70 /* CaretEqualsToken */:
+                    case 69 /* BarEqualsToken */:
+                        return 1 /* Right */;
                 }
         }
-        return 0;
+        return 0 /* Left */;
     }
     ts.getOperatorAssociativity = getOperatorAssociativity;
     function getExpressionPrecedence(expression) {
         var operator = getOperator(expression);
-        var hasArguments = expression.kind === 188 && expression.arguments !== undefined;
+        var hasArguments = expression.kind === 188 /* NewExpression */ && expression.arguments !== undefined;
         return getOperatorPrecedence(expression.kind, operator, hasArguments);
     }
     ts.getExpressionPrecedence = getExpressionPrecedence;
     function getOperator(expression) {
-        if (expression.kind === 200) {
+        if (expression.kind === 200 /* BinaryExpression */) {
             return expression.operatorToken.kind;
         }
-        else if (expression.kind === 198 || expression.kind === 199) {
+        else if (expression.kind === 198 /* PrefixUnaryExpression */ || expression.kind === 199 /* PostfixUnaryExpression */) {
             return expression.operator;
         }
         else {
@@ -8612,122 +10016,125 @@ var ts;
     ts.getOperator = getOperator;
     function getOperatorPrecedence(nodeKind, operatorKind, hasArguments) {
         switch (nodeKind) {
-            case 302:
+            case 302 /* CommaListExpression */:
                 return 0;
-            case 204:
+            case 204 /* SpreadElement */:
                 return 1;
-            case 203:
+            case 203 /* YieldExpression */:
                 return 2;
-            case 201:
+            case 201 /* ConditionalExpression */:
                 return 4;
-            case 200:
+            case 200 /* BinaryExpression */:
                 switch (operatorKind) {
-                    case 26:
+                    case 26 /* CommaToken */:
                         return 0;
-                    case 58:
-                    case 59:
-                    case 60:
-                    case 62:
-                    case 61:
-                    case 63:
-                    case 64:
-                    case 65:
-                    case 66:
-                    case 67:
-                    case 68:
-                    case 70:
-                    case 69:
+                    case 58 /* EqualsToken */:
+                    case 59 /* PlusEqualsToken */:
+                    case 60 /* MinusEqualsToken */:
+                    case 62 /* AsteriskAsteriskEqualsToken */:
+                    case 61 /* AsteriskEqualsToken */:
+                    case 63 /* SlashEqualsToken */:
+                    case 64 /* PercentEqualsToken */:
+                    case 65 /* LessThanLessThanEqualsToken */:
+                    case 66 /* GreaterThanGreaterThanEqualsToken */:
+                    case 67 /* GreaterThanGreaterThanGreaterThanEqualsToken */:
+                    case 68 /* AmpersandEqualsToken */:
+                    case 70 /* CaretEqualsToken */:
+                    case 69 /* BarEqualsToken */:
                         return 3;
                     default:
                         return getBinaryOperatorPrecedence(operatorKind);
                 }
-            case 198:
-            case 195:
-            case 196:
-            case 194:
-            case 197:
+            case 198 /* PrefixUnaryExpression */:
+            case 195 /* TypeOfExpression */:
+            case 196 /* VoidExpression */:
+            case 194 /* DeleteExpression */:
+            case 197 /* AwaitExpression */:
                 return 16;
-            case 199:
+            case 199 /* PostfixUnaryExpression */:
                 return 17;
-            case 187:
+            case 187 /* CallExpression */:
                 return 18;
-            case 188:
+            case 188 /* NewExpression */:
                 return hasArguments ? 19 : 18;
-            case 189:
-            case 185:
-            case 186:
+            case 189 /* TaggedTemplateExpression */:
+            case 185 /* PropertyAccessExpression */:
+            case 186 /* ElementAccessExpression */:
                 return 19;
-            case 99:
-            case 97:
-            case 71:
-            case 95:
-            case 101:
-            case 86:
-            case 8:
-            case 9:
-            case 183:
-            case 184:
-            case 192:
-            case 193:
-            case 205:
-            case 255:
-            case 256:
-            case 259:
-            case 12:
-            case 13:
-            case 202:
-            case 191:
-            case 206:
+            case 99 /* ThisKeyword */:
+            case 97 /* SuperKeyword */:
+            case 71 /* Identifier */:
+            case 95 /* NullKeyword */:
+            case 101 /* TrueKeyword */:
+            case 86 /* FalseKeyword */:
+            case 8 /* NumericLiteral */:
+            case 9 /* StringLiteral */:
+            case 183 /* ArrayLiteralExpression */:
+            case 184 /* ObjectLiteralExpression */:
+            case 192 /* FunctionExpression */:
+            case 193 /* ArrowFunction */:
+            case 205 /* ClassExpression */:
+            case 255 /* JsxElement */:
+            case 256 /* JsxSelfClosingElement */:
+            case 259 /* JsxFragment */:
+            case 12 /* RegularExpressionLiteral */:
+            case 13 /* NoSubstitutionTemplateLiteral */:
+            case 202 /* TemplateExpression */:
+            case 191 /* ParenthesizedExpression */:
+            case 206 /* OmittedExpression */:
                 return 20;
             default:
                 return -1;
         }
     }
     ts.getOperatorPrecedence = getOperatorPrecedence;
+    /* @internal */
     function getBinaryOperatorPrecedence(kind) {
         switch (kind) {
-            case 54:
+            case 54 /* BarBarToken */:
                 return 5;
-            case 53:
+            case 53 /* AmpersandAmpersandToken */:
                 return 6;
-            case 49:
+            case 49 /* BarToken */:
                 return 7;
-            case 50:
+            case 50 /* CaretToken */:
                 return 8;
-            case 48:
+            case 48 /* AmpersandToken */:
                 return 9;
-            case 32:
-            case 33:
-            case 34:
-            case 35:
+            case 32 /* EqualsEqualsToken */:
+            case 33 /* ExclamationEqualsToken */:
+            case 34 /* EqualsEqualsEqualsToken */:
+            case 35 /* ExclamationEqualsEqualsToken */:
                 return 10;
-            case 27:
-            case 29:
-            case 30:
-            case 31:
-            case 93:
-            case 92:
-            case 118:
+            case 27 /* LessThanToken */:
+            case 29 /* GreaterThanToken */:
+            case 30 /* LessThanEqualsToken */:
+            case 31 /* GreaterThanEqualsToken */:
+            case 93 /* InstanceOfKeyword */:
+            case 92 /* InKeyword */:
+            case 118 /* AsKeyword */:
                 return 11;
-            case 45:
-            case 46:
-            case 47:
+            case 45 /* LessThanLessThanToken */:
+            case 46 /* GreaterThanGreaterThanToken */:
+            case 47 /* GreaterThanGreaterThanGreaterThanToken */:
                 return 12;
-            case 37:
-            case 38:
+            case 37 /* PlusToken */:
+            case 38 /* MinusToken */:
                 return 13;
-            case 39:
-            case 41:
-            case 42:
+            case 39 /* AsteriskToken */:
+            case 41 /* SlashToken */:
+            case 42 /* PercentToken */:
                 return 14;
-            case 40:
+            case 40 /* AsteriskAsteriskToken */:
                 return 15;
         }
+        // -1 is lower than all other precedences.  Returning it will cause binary expression
+        // parsing to stop.
         return -1;
     }
     ts.getBinaryOperatorPrecedence = getBinaryOperatorPrecedence;
     function createDiagnosticCollection() {
-        var nonFileDiagnostics = [];
+        var nonFileDiagnostics = []; // See GH#19873
         var filesWithDiagnostics = [];
         var fileDiagnostics = ts.createMap();
         var hasReadNonFileDiagnostics = false;
@@ -8745,12 +10152,13 @@ var ts;
             if (diagnostic.file) {
                 diagnostics = fileDiagnostics.get(diagnostic.file.fileName);
                 if (!diagnostics) {
-                    diagnostics = [];
+                    diagnostics = []; // See GH#19873
                     fileDiagnostics.set(diagnostic.file.fileName, diagnostics);
                     ts.insertSorted(filesWithDiagnostics, diagnostic.file.fileName, ts.compareStringsCaseSensitive);
                 }
             }
             else {
+                // If we've already read the non-file diagnostics, do not modify the existing array.
                 if (hasReadNonFileDiagnostics) {
                     hasReadNonFileDiagnostics = false;
                     nonFileDiagnostics = nonFileDiagnostics.slice();
@@ -8776,6 +10184,11 @@ var ts;
         }
     }
     ts.createDiagnosticCollection = createDiagnosticCollection;
+    // This consists of the first 19 unprintable ASCII characters, canonical escapes, lineSeparator,
+    // paragraphSeparator, and nextLine. The latter three are just desirable to suppress new lines in
+    // the language service. These characters should be escaped when printing, and if any characters are added,
+    // the map below must be updated. Note that this regexp *does not* include the 'delete' character.
+    // There is no reason for this other than that JSON.stringify does not handle it either.
     var doubleQuoteEscapedCharsRegExp = /[\\\"\u0000-\u001f\t\v\f\b\r\n\u2028\u2029\u0085]/g;
     var singleQuoteEscapedCharsRegExp = /[\\\'\u0000-\u001f\t\v\f\b\r\n\u2028\u2029\u0085]/g;
     var backtickQuoteEscapedCharsRegExp = /[\\\`\u0000-\u001f\t\v\f\b\r\n\u2028\u2029\u0085]/g;
@@ -8792,28 +10205,35 @@ var ts;
         "\`": "\\\`",
         "\u2028": "\\u2028",
         "\u2029": "\\u2029",
-        "\u0085": "\\u0085"
+        "\u0085": "\\u0085" // nextLine
     });
+    /**
+     * Based heavily on the abstract 'Quote'/'QuoteJSONString' operation from ECMA-262 (24.3.2.2),
+     * but augmented for a few select characters (e.g. lineSeparator, paragraphSeparator, nextLine)
+     * Note that this doesn't actually wrap the input in double quotes.
+     */
     function escapeString(s, quoteChar) {
-        var escapedCharsRegExp = quoteChar === 96 ? backtickQuoteEscapedCharsRegExp :
-            quoteChar === 39 ? singleQuoteEscapedCharsRegExp :
+        var escapedCharsRegExp = quoteChar === 96 /* backtick */ ? backtickQuoteEscapedCharsRegExp :
+            quoteChar === 39 /* singleQuote */ ? singleQuoteEscapedCharsRegExp :
                 doubleQuoteEscapedCharsRegExp;
         return s.replace(escapedCharsRegExp, getReplacement);
     }
     ts.escapeString = escapeString;
     function getReplacement(c, offset, input) {
-        if (c.charCodeAt(0) === 0) {
+        if (c.charCodeAt(0) === 0 /* nullCharacter */) {
             var lookAhead = input.charCodeAt(offset + c.length);
-            if (lookAhead >= 48 && lookAhead <= 57) {
+            if (lookAhead >= 48 /* _0 */ && lookAhead <= 57 /* _9 */) {
+                // If the null character is followed by digits, print as a hex escape to prevent the result from parsing as an octal (which is forbidden in strict mode)
                 return "\\x00";
             }
+            // Otherwise, keep printing a literal \0 for the null character
             return "\\0";
         }
         return escapedCharsMap.get(c) || get16BitUnicodeEscapeSequence(c.charCodeAt(0));
     }
     function isIntrinsicJsxName(name) {
         var ch = name.charCodeAt(0);
-        return (ch >= 97 && ch <= 122) || name.indexOf("-") > -1;
+        return (ch >= 97 /* a */ && ch <= 122 /* z */) || name.indexOf("-") > -1;
     }
     ts.isIntrinsicJsxName = isIntrinsicJsxName;
     function get16BitUnicodeEscapeSequence(charCode) {
@@ -8824,6 +10244,8 @@ var ts;
     var nonAsciiCharacters = /[^\u0000-\u007F]/g;
     function escapeNonAsciiString(s, quoteChar) {
         s = escapeString(s, quoteChar);
+        // Replace non-ASCII characters with '\uNNNN' escapes if any exist.
+        // Otherwise just return the original string.
         return nonAsciiCharacters.test(s) ?
             s.replace(nonAsciiCharacters, function (c) { return get16BitUnicodeEscapeSequence(c.charCodeAt(0)); }) :
             s;
@@ -8847,13 +10269,25 @@ var ts;
         var lineStart;
         var lineCount;
         var linePos;
+        function updateLineCountAndPosFor(s) {
+            var lineStartsOfS = ts.computeLineStarts(s);
+            if (lineStartsOfS.length > 1) {
+                lineCount = lineCount + lineStartsOfS.length - 1;
+                linePos = output.length - s.length + ts.last(lineStartsOfS);
+                lineStart = (linePos - output.length) === 0;
+            }
+            else {
+                lineStart = false;
+            }
+        }
         function write(s) {
             if (s && s.length) {
                 if (lineStart) {
-                    output += getIndentString(indent);
+                    s = getIndentString(indent) + s;
                     lineStart = false;
                 }
                 output += s;
+                updateLineCountAndPosFor(s);
             }
         }
         function reset() {
@@ -8865,20 +10299,13 @@ var ts;
         }
         function rawWrite(s) {
             if (s !== undefined) {
-                if (lineStart) {
-                    lineStart = false;
-                }
                 output += s;
+                updateLineCountAndPosFor(s);
             }
         }
         function writeLiteral(s) {
             if (s && s.length) {
                 write(s);
-                var lineStartsOfS = ts.computeLineStarts(s);
-                if (lineStartsOfS.length > 1) {
-                    lineCount = lineCount + lineStartsOfS.length - 1;
-                    linePos = output.length - s.length + ts.last(lineStartsOfS);
-                }
             }
         }
         function writeLine() {
@@ -8890,7 +10317,9 @@ var ts;
             }
         }
         function writeTextOfNode(text, node) {
-            write(getTextOfNodeFromSourceText(text, node));
+            var s = getTextOfNodeFromSourceText(text, node);
+            write(s);
+            updateLineCountAndPosFor(s);
         }
         reset();
         return {
@@ -8935,11 +10364,14 @@ var ts;
         return getResolvedExternalModuleName(host, file);
     }
     ts.getExternalModuleNameFromDeclaration = getExternalModuleNameFromDeclaration;
+    /**
+     * Resolves a local path to a path which is absolute to the base of the emit
+     */
     function getExternalModuleNameFromPath(host, fileName, referencePath) {
         var getCanonicalFileName = function (f) { return host.getCanonicalFileName(f); };
         var dir = ts.toPath(referencePath ? ts.getDirectoryPath(referencePath) : host.getCommonSourceDirectory(), host.getCurrentDirectory(), getCanonicalFileName);
         var filePath = ts.getNormalizedAbsolutePath(fileName, host.getCurrentDirectory());
-        var relativePath = ts.getRelativePathToDirectoryOrUrl(dir, filePath, dir, getCanonicalFileName, false);
+        var relativePath = ts.getRelativePathToDirectoryOrUrl(dir, filePath, dir, getCanonicalFileName, /*isAbsolutePathAnUrl*/ false);
         var extensionless = ts.removeFileExtension(relativePath);
         return referencePath ? ts.ensurePathIsNonModuleName(extensionless) : extensionless;
     }
@@ -8958,19 +10390,29 @@ var ts;
     ts.getOwnEmitOutputFilePath = getOwnEmitOutputFilePath;
     function getDeclarationEmitOutputFilePath(sourceFile, host) {
         var options = host.getCompilerOptions();
-        var outputDir = options.declarationDir || options.outDir;
+        var outputDir = options.declarationDir || options.outDir; // Prefer declaration folder if specified
         var path = outputDir
             ? getSourceFilePathInNewDir(sourceFile, host, outputDir)
             : sourceFile.fileName;
-        return ts.removeFileExtension(path) + ".d.ts";
+        return ts.removeFileExtension(path) + ".d.ts" /* Dts */;
     }
     ts.getDeclarationEmitOutputFilePath = getDeclarationEmitOutputFilePath;
+    /**
+     * Gets the source files that are expected to have an emit output.
+     *
+     * Originally part of `forEachExpectedEmitFile`, this functionality was extracted to support
+     * transformations.
+     *
+     * @param host An EmitHost.
+     * @param targetSourceFile An optional target source file to emit.
+     */
     function getSourceFilesToEmit(host, targetSourceFile) {
         var options = host.getCompilerOptions();
         var isSourceFileFromExternalLibrary = function (file) { return host.isSourceFileFromExternalLibrary(file); };
         if (options.outFile || options.out) {
             var moduleKind = ts.getEmitModuleKind(options);
             var moduleEmitEnabled_1 = moduleKind === ts.ModuleKind.AMD || moduleKind === ts.ModuleKind.System;
+            // Can emit only sources that are not declaration file and are either non module code or module with --module or --target es6 specified
             return ts.filter(host.getSourceFiles(), function (sourceFile) {
                 return (moduleEmitEnabled_1 || !ts.isExternalModule(sourceFile)) && sourceFileMayBeEmitted(sourceFile, options, isSourceFileFromExternalLibrary);
             });
@@ -8981,6 +10423,7 @@ var ts;
         }
     }
     ts.getSourceFilesToEmit = getSourceFilesToEmit;
+    /** Don't call this for `--outFile`, just for `--outDir` or plain emit. `--outFile` needs additional checks. */
     function sourceFileMayBeEmitted(sourceFile, options, isSourceFileFromExternalLibrary) {
         return !(options.noEmitForJsFiles && isSourceFileJavaScript(sourceFile)) && !sourceFile.isDeclarationFile && !isSourceFileFromExternalLibrary(sourceFile);
     }
@@ -9017,12 +10460,14 @@ var ts;
             return accessor.parameters[hasThis ? 1 : 0];
         }
     }
+    /** Get the type annotation for the value parameter. */
     function getSetAccessorTypeAnnotationNode(accessor) {
         var parameter = getSetAccessorValueParameter(accessor);
         return parameter && parameter.type;
     }
     ts.getSetAccessorTypeAnnotationNode = getSetAccessorTypeAnnotationNode;
     function getThisParameter(signature) {
+        // callback tags do not currently support this parameters
         if (signature.parameters.length && !ts.isJSDocSignature(signature)) {
             var thisParameter = signature.parameters[0];
             if (parameterIsThisKeyword(thisParameter)) {
@@ -9036,24 +10481,25 @@ var ts;
     }
     ts.parameterIsThisKeyword = parameterIsThisKeyword;
     function isThisIdentifier(node) {
-        return !!node && node.kind === 71 && identifierIsThisKeyword(node);
+        return !!node && node.kind === 71 /* Identifier */ && identifierIsThisKeyword(node);
     }
     ts.isThisIdentifier = isThisIdentifier;
     function identifierIsThisKeyword(id) {
-        return id.originalKeywordKind === 99;
+        return id.originalKeywordKind === 99 /* ThisKeyword */;
     }
     ts.identifierIsThisKeyword = identifierIsThisKeyword;
     function getAllAccessorDeclarations(declarations, accessor) {
+        // TODO: GH#18217
         var firstAccessor;
         var secondAccessor;
         var getAccessor;
         var setAccessor;
         if (hasDynamicName(accessor)) {
             firstAccessor = accessor;
-            if (accessor.kind === 156) {
+            if (accessor.kind === 156 /* GetAccessor */) {
                 getAccessor = accessor;
             }
-            else if (accessor.kind === 157) {
+            else if (accessor.kind === 157 /* SetAccessor */) {
                 setAccessor = accessor;
             }
             else {
@@ -9062,8 +10508,8 @@ var ts;
         }
         else {
             ts.forEach(declarations, function (member) {
-                if ((member.kind === 156 || member.kind === 157)
-                    && hasModifier(member, 32) === hasModifier(accessor, 32)) {
+                if ((member.kind === 156 /* GetAccessor */ || member.kind === 157 /* SetAccessor */)
+                    && hasModifier(member, 32 /* Static */) === hasModifier(accessor, 32 /* Static */)) {
                     var memberName = getPropertyNameForPropertyNameNode(member.name);
                     var accessorName = getPropertyNameForPropertyNameNode(accessor.name);
                     if (memberName === accessorName) {
@@ -9073,10 +10519,10 @@ var ts;
                         else if (!secondAccessor) {
                             secondAccessor = member;
                         }
-                        if (member.kind === 156 && !getAccessor) {
+                        if (member.kind === 156 /* GetAccessor */ && !getAccessor) {
                             getAccessor = member;
                         }
-                        if (member.kind === 157 && !setAccessor) {
+                        if (member.kind === 157 /* SetAccessor */ && !setAccessor) {
                             setAccessor = member;
                         }
                     }
@@ -9091,6 +10537,10 @@ var ts;
         };
     }
     ts.getAllAccessorDeclarations = getAllAccessorDeclarations;
+    /**
+     * Gets the effective type annotation of a variable, parameter, or property. If the node was
+     * parsed in a JavaScript file, gets the type annotation from JSDoc.
+     */
     function getEffectiveTypeAnnotationNode(node) {
         return node.type || (isInJavaScriptFile(node) ? ts.getJSDocType(node) : undefined);
     }
@@ -9099,6 +10549,10 @@ var ts;
         return node.type;
     }
     ts.getTypeAnnotationNode = getTypeAnnotationNode;
+    /**
+     * Gets the effective return type annotation of a signature. If the node was parsed in a
+     * JavaScript file, gets the return type annotation from JSDoc.
+     */
     function getEffectiveReturnTypeNode(node) {
         if (ts.isJSDocSignature(node)) {
             return node.type && node.type.typeExpression && node.type.typeExpression.type;
@@ -9106,12 +10560,16 @@ var ts;
         return node.type || (isInJavaScriptFile(node) ? ts.getJSDocReturnType(node) : undefined);
     }
     ts.getEffectiveReturnTypeNode = getEffectiveReturnTypeNode;
+    /**
+     * Gets the effective type parameters. If the node was parsed in a
+     * JavaScript file, gets the type parameters from the `@template` tag from JSDoc.
+     */
     function getEffectiveTypeParameterDeclarations(node) {
         if (ts.isJSDocSignature(node)) {
             return ts.emptyArray;
         }
         if (isJSDocTypeAlias(node)) {
-            ts.Debug.assert(node.parent.kind === 286);
+            ts.Debug.assert(node.parent.kind === 286 /* JSDocComment */);
             return ts.flatMap(node.parent.tags, function (tag) { return ts.isJSDocTemplateTag(tag) ? tag.typeParameters : undefined; });
         }
         return node.typeParameters || (isInJavaScriptFile(node) ? getJSDocTypeParameterDeclarations(node) : ts.emptyArray);
@@ -9121,9 +10579,14 @@ var ts;
         return ts.flatMap(ts.getJSDocTags(node), function (tag) { return isNonTypeAliasTemplate(tag) ? tag.typeParameters : undefined; });
     }
     ts.getJSDocTypeParameterDeclarations = getJSDocTypeParameterDeclarations;
+    /** template tags are only available when a typedef isn't already using them */
     function isNonTypeAliasTemplate(tag) {
-        return ts.isJSDocTemplateTag(tag) && !(tag.parent.kind === 286 && tag.parent.tags.some(isJSDocTypeAlias));
+        return ts.isJSDocTemplateTag(tag) && !(tag.parent.kind === 286 /* JSDocComment */ && tag.parent.tags.some(isJSDocTypeAlias));
     }
+    /**
+     * Gets the effective type annotation of the value parameter of a set accessor. If the node
+     * was parsed in a JavaScript file, gets the type annotation from JSDoc.
+     */
     function getEffectiveSetAccessorTypeAnnotationNode(node) {
         var parameter = getSetAccessorValueParameter(node);
         return parameter && getEffectiveTypeAnnotationNode(parameter);
@@ -9134,6 +10597,7 @@ var ts;
     }
     ts.emitNewLineBeforeLeadingComments = emitNewLineBeforeLeadingComments;
     function emitNewLineBeforeLeadingCommentsOfPosition(lineMap, writer, pos, leadingComments) {
+        // If the leading comments start on different line than the start of node, write new line
         if (leadingComments && leadingComments.length && pos !== leadingComments[0].pos &&
             getLineOfLocalPositionFromLineMap(lineMap, pos) !== getLineOfLocalPositionFromLineMap(lineMap, leadingComments[0].pos)) {
             writer.writeLine();
@@ -9141,6 +10605,7 @@ var ts;
     }
     ts.emitNewLineBeforeLeadingCommentsOfPosition = emitNewLineBeforeLeadingCommentsOfPosition;
     function emitNewLineBeforeLeadingCommentOfPosition(lineMap, writer, pos, commentPos) {
+        // If the leading comments start on different line than the start of node, write new line
         if (pos !== commentPos &&
             getLineOfLocalPositionFromLineMap(lineMap, pos) !== getLineOfLocalPositionFromLineMap(lineMap, commentPos)) {
             writer.writeLine();
@@ -9173,15 +10638,25 @@ var ts;
         }
     }
     ts.emitComments = emitComments;
+    /**
+     * Detached comment is a comment at the top of file or function body that is separated from
+     * the next statement by space.
+     */
     function emitDetachedComments(text, lineMap, writer, writeComment, node, newLine, removeComments) {
         var leadingComments;
         var currentDetachedCommentInfo;
         if (removeComments) {
+            // removeComments is true, only reserve pinned comment at the top of file
+            // For example:
+            //      /*! Pinned Comment */
+            //
+            //      var x = 10;
             if (node.pos === 0) {
                 leadingComments = ts.filter(ts.getLeadingCommentRanges(text, node.pos), isPinnedCommentLocal);
             }
         }
         else {
+            // removeComments is false, just get detached as normal and bypass the process to filter comment
             leadingComments = ts.getLeadingCommentRanges(text, node.pos);
         }
         if (leadingComments) {
@@ -9193,6 +10668,9 @@ var ts;
                     var lastCommentLine = getLineOfLocalPositionFromLineMap(lineMap, lastComment.end);
                     var commentLine = getLineOfLocalPositionFromLineMap(lineMap, comment.pos);
                     if (commentLine >= lastCommentLine + 2) {
+                        // There was a blank line between the last comment and this comment.  This
+                        // comment is not part of the copyright comments.  Return what we have so
+                        // far.
                         break;
                     }
                 }
@@ -9200,11 +10678,15 @@ var ts;
                 lastComment = comment;
             }
             if (detachedComments.length) {
+                // All comments look like they could have been part of the copyright header.  Make
+                // sure there is at least one blank line between it and the node.  If not, it's not
+                // a copyright header.
                 var lastCommentLine = getLineOfLocalPositionFromLineMap(lineMap, ts.last(detachedComments).end);
                 var nodeLine = getLineOfLocalPositionFromLineMap(lineMap, ts.skipTrivia(text, node.pos));
                 if (nodeLine >= lastCommentLine + 2) {
+                    // Valid detachedComments
                     emitNewLineBeforeLeadingComments(lineMap, writer, node, leadingComments);
-                    emitComments(text, lineMap, writer, detachedComments, false, true, newLine, writeComment);
+                    emitComments(text, lineMap, writer, detachedComments, /*leadingSeparator*/ false, /*trailingSeparator*/ true, newLine, writeComment);
                     currentDetachedCommentInfo = { nodePos: node.pos, detachedCommentEndPos: ts.last(detachedComments).end };
                 }
             }
@@ -9216,7 +10698,7 @@ var ts;
     }
     ts.emitDetachedComments = emitDetachedComments;
     function writeCommentRange(text, lineMap, writer, commentPos, commentEnd, newLine) {
-        if (text.charCodeAt(commentPos + 1) === 42) {
+        if (text.charCodeAt(commentPos + 1) === 42 /* asterisk */) {
             var firstCommentLineAndCharacter = ts.computeLineAndCharacterOfPosition(lineMap, commentPos);
             var lineCount = lineMap.length;
             var firstCommentLineIndent = void 0;
@@ -9225,29 +10707,50 @@ var ts;
                     ? text.length + 1
                     : lineMap[currentLine + 1];
                 if (pos !== commentPos) {
+                    // If we are not emitting first line, we need to write the spaces to adjust the alignment
                     if (firstCommentLineIndent === undefined) {
                         firstCommentLineIndent = calculateIndent(text, lineMap[firstCommentLineAndCharacter.line], commentPos);
                     }
+                    // These are number of spaces writer is going to write at current indent
                     var currentWriterIndentSpacing = writer.getIndent() * getIndentSize();
+                    // Number of spaces we want to be writing
+                    // eg: Assume writer indent
+                    // module m {
+                    //         /* starts at character 9 this is line 1
+                    //    * starts at character pos 4 line                        --1  = 8 - 8 + 3
+                    //   More left indented comment */                            --2  = 8 - 8 + 2
+                    //     class c { }
+                    // }
+                    // module m {
+                    //     /* this is line 1 -- Assume current writer indent 8
+                    //      * line                                                --3 = 8 - 4 + 5
+                    //            More right indented comment */                  --4 = 8 - 4 + 11
+                    //     class c { }
+                    // }
                     var spacesToEmit = currentWriterIndentSpacing - firstCommentLineIndent + calculateIndent(text, pos, nextLineStart);
                     if (spacesToEmit > 0) {
                         var numberOfSingleSpacesToEmit = spacesToEmit % getIndentSize();
                         var indentSizeSpaceString = getIndentString((spacesToEmit - numberOfSingleSpacesToEmit) / getIndentSize());
+                        // Write indent size string ( in eg 1: = "", 2: "" , 3: string with 8 spaces 4: string with 12 spaces
                         writer.rawWrite(indentSizeSpaceString);
+                        // Emit the single spaces (in eg: 1: 3 spaces, 2: 2 spaces, 3: 1 space, 4: 3 spaces)
                         while (numberOfSingleSpacesToEmit) {
                             writer.rawWrite(" ");
                             numberOfSingleSpacesToEmit--;
                         }
                     }
                     else {
+                        // No spaces to emit write empty string
                         writer.rawWrite("");
                     }
                 }
+                // Write the comment line text
                 writeTrimmedCurrentLine(text, commentEnd, writer, newLine, pos, nextLineStart);
                 pos = nextLineStart;
             }
         }
         else {
+            // Single line comment of style //....
             writer.write(text.substring(commentPos, commentEnd));
         }
     }
@@ -9256,29 +10759,33 @@ var ts;
         var end = Math.min(commentEnd, nextLineStart - 1);
         var currentLineText = text.substring(pos, end).replace(/^\s+|\s+$/g, "");
         if (currentLineText) {
+            // trimmed forward and ending spaces text
             writer.write(currentLineText);
             if (end !== commentEnd) {
                 writer.writeLine();
             }
         }
         else {
+            // Empty string - make sure we write empty line
             writer.writeLiteral(newLine);
         }
     }
     function calculateIndent(text, pos, end) {
         var currentLineIndent = 0;
         for (; pos < end && ts.isWhiteSpaceSingleLine(text.charCodeAt(pos)); pos++) {
-            if (text.charCodeAt(pos) === 9) {
+            if (text.charCodeAt(pos) === 9 /* tab */) {
+                // Tabs = TabSize = indent size and go to next tabStop
                 currentLineIndent += getIndentSize() - (currentLineIndent % getIndentSize());
             }
             else {
+                // Single space
                 currentLineIndent++;
             }
         }
         return currentLineIndent;
     }
     function hasModifiers(node) {
-        return getModifierFlags(node) !== 0;
+        return getModifierFlags(node) !== 0 /* None */;
     }
     ts.hasModifiers = hasModifiers;
     function hasModifier(node, flags) {
@@ -9286,11 +10793,11 @@ var ts;
     }
     ts.hasModifier = hasModifier;
     function hasStaticModifier(node) {
-        return hasModifier(node, 32);
+        return hasModifier(node, 32 /* Static */);
     }
     ts.hasStaticModifier = hasStaticModifier;
     function hasReadonlyModifier(node) {
-        return hasModifier(node, 64);
+        return hasModifier(node, 64 /* Readonly */);
     }
     ts.hasReadonlyModifier = hasReadonlyModifier;
     function getSelectedModifierFlags(node, flags) {
@@ -9298,58 +10805,59 @@ var ts;
     }
     ts.getSelectedModifierFlags = getSelectedModifierFlags;
     function getModifierFlags(node) {
-        if (node.modifierFlagsCache & 536870912) {
-            return node.modifierFlagsCache & ~536870912;
+        if (node.modifierFlagsCache & 536870912 /* HasComputedFlags */) {
+            return node.modifierFlagsCache & ~536870912 /* HasComputedFlags */;
         }
         var flags = getModifierFlagsNoCache(node);
-        node.modifierFlagsCache = flags | 536870912;
+        node.modifierFlagsCache = flags | 536870912 /* HasComputedFlags */;
         return flags;
     }
     ts.getModifierFlags = getModifierFlags;
     function getModifierFlagsNoCache(node) {
-        var flags = 0;
+        var flags = 0 /* None */;
         if (node.modifiers) {
             for (var _i = 0, _a = node.modifiers; _i < _a.length; _i++) {
                 var modifier = _a[_i];
                 flags |= modifierToFlag(modifier.kind);
             }
         }
-        if (node.flags & 4 || (node.kind === 71 && node.isInJSDocNamespace)) {
-            flags |= 1;
+        if (node.flags & 4 /* NestedNamespace */ || (node.kind === 71 /* Identifier */ && node.isInJSDocNamespace)) {
+            flags |= 1 /* Export */;
         }
         return flags;
     }
     ts.getModifierFlagsNoCache = getModifierFlagsNoCache;
     function modifierToFlag(token) {
         switch (token) {
-            case 115: return 32;
-            case 114: return 4;
-            case 113: return 16;
-            case 112: return 8;
-            case 117: return 128;
-            case 84: return 1;
-            case 124: return 2;
-            case 76: return 2048;
-            case 79: return 512;
-            case 120: return 256;
-            case 132: return 64;
+            case 115 /* StaticKeyword */: return 32 /* Static */;
+            case 114 /* PublicKeyword */: return 4 /* Public */;
+            case 113 /* ProtectedKeyword */: return 16 /* Protected */;
+            case 112 /* PrivateKeyword */: return 8 /* Private */;
+            case 117 /* AbstractKeyword */: return 128 /* Abstract */;
+            case 84 /* ExportKeyword */: return 1 /* Export */;
+            case 124 /* DeclareKeyword */: return 2 /* Ambient */;
+            case 76 /* ConstKeyword */: return 2048 /* Const */;
+            case 79 /* DefaultKeyword */: return 512 /* Default */;
+            case 120 /* AsyncKeyword */: return 256 /* Async */;
+            case 132 /* ReadonlyKeyword */: return 64 /* Readonly */;
         }
-        return 0;
+        return 0 /* None */;
     }
     ts.modifierToFlag = modifierToFlag;
     function isLogicalOperator(token) {
-        return token === 54
-            || token === 53
-            || token === 51;
+        return token === 54 /* BarBarToken */
+            || token === 53 /* AmpersandAmpersandToken */
+            || token === 51 /* ExclamationToken */;
     }
     ts.isLogicalOperator = isLogicalOperator;
     function isAssignmentOperator(token) {
-        return token >= 58 && token <= 70;
+        return token >= 58 /* FirstAssignment */ && token <= 70 /* LastAssignment */;
     }
     ts.isAssignmentOperator = isAssignmentOperator;
+    /** Get `C` given `N` if `N` is in the position `class C extends N` where `N` is an ExpressionWithTypeArguments. */
     function tryGetClassExtendingExpressionWithTypeArguments(node) {
         if (ts.isExpressionWithTypeArguments(node) &&
-            node.parent.token === 85 &&
+            node.parent.token === 85 /* ExtendsKeyword */ &&
             ts.isClassLike(node.parent.parent)) {
             return node.parent.parent;
         }
@@ -9358,16 +10866,16 @@ var ts;
     function isAssignmentExpression(node, excludeCompoundAssignment) {
         return ts.isBinaryExpression(node)
             && (excludeCompoundAssignment
-                ? node.operatorToken.kind === 58
+                ? node.operatorToken.kind === 58 /* EqualsToken */
                 : isAssignmentOperator(node.operatorToken.kind))
             && ts.isLeftHandSideExpression(node.left);
     }
     ts.isAssignmentExpression = isAssignmentExpression;
     function isDestructuringAssignment(node) {
-        if (isAssignmentExpression(node, true)) {
+        if (isAssignmentExpression(node, /*excludeCompoundAssignment*/ true)) {
             var kind = node.left.kind;
-            return kind === 184
-                || kind === 183;
+            return kind === 184 /* ObjectLiteralExpression */
+                || kind === 183 /* ArrayLiteralExpression */;
         }
         return false;
     }
@@ -9377,16 +10885,16 @@ var ts;
     }
     ts.isExpressionWithTypeArgumentsInClassExtendsClause = isExpressionWithTypeArgumentsInClassExtendsClause;
     function isExpressionWithTypeArgumentsInClassImplementsClause(node) {
-        return node.kind === 207
+        return node.kind === 207 /* ExpressionWithTypeArguments */
             && isEntityNameExpression(node.expression)
             && node.parent
-            && node.parent.token === 108
+            && node.parent.token === 108 /* ImplementsKeyword */
             && node.parent.parent
             && ts.isClassLike(node.parent.parent);
     }
     ts.isExpressionWithTypeArgumentsInClassImplementsClause = isExpressionWithTypeArgumentsInClassImplementsClause;
     function isEntityNameExpression(node) {
-        return node.kind === 71 || isPropertyAccessEntityNameExpression(node);
+        return node.kind === 71 /* Identifier */ || isPropertyAccessEntityNameExpression(node);
     }
     ts.isEntityNameExpression = isEntityNameExpression;
     function isPropertyAccessEntityNameExpression(node) {
@@ -9398,17 +10906,17 @@ var ts;
     }
     ts.isPrototypeAccess = isPrototypeAccess;
     function isRightSideOfQualifiedNameOrPropertyAccess(node) {
-        return (node.parent.kind === 146 && node.parent.right === node) ||
-            (node.parent.kind === 185 && node.parent.name === node);
+        return (node.parent.kind === 146 /* QualifiedName */ && node.parent.right === node) ||
+            (node.parent.kind === 185 /* PropertyAccessExpression */ && node.parent.name === node);
     }
     ts.isRightSideOfQualifiedNameOrPropertyAccess = isRightSideOfQualifiedNameOrPropertyAccess;
     function isEmptyObjectLiteral(expression) {
-        return expression.kind === 184 &&
+        return expression.kind === 184 /* ObjectLiteralExpression */ &&
             expression.properties.length === 0;
     }
     ts.isEmptyObjectLiteral = isEmptyObjectLiteral;
     function isEmptyArrayLiteral(expression) {
-        return expression.kind === 183 &&
+        return expression.kind === 183 /* ArrayLiteralExpression */ &&
             expression.elements.length === 0;
     }
     ts.isEmptyArrayLiteral = isEmptyArrayLiteral;
@@ -9417,17 +10925,23 @@ var ts;
     }
     ts.getLocalSymbolForExportDefault = getLocalSymbolForExportDefault;
     function isExportDefaultSymbol(symbol) {
-        return symbol && ts.length(symbol.declarations) > 0 && hasModifier(symbol.declarations[0], 512);
+        return symbol && ts.length(symbol.declarations) > 0 && hasModifier(symbol.declarations[0], 512 /* Default */);
     }
+    /** Return ".ts", ".d.ts", or ".tsx", if that is the extension. */
     function tryExtractTypeScriptExtension(fileName) {
         return ts.find(ts.supportedTypescriptExtensionsForExtractExtension, function (extension) { return ts.fileExtensionIs(fileName, extension); });
     }
     ts.tryExtractTypeScriptExtension = tryExtractTypeScriptExtension;
+    /**
+     * Replace each instance of non-ascii characters by one, two, three, or four escape sequences
+     * representing the UTF-8 encoding of the character, and return the expanded char code list.
+     */
     function getExpandedCharCodes(input) {
         var output = [];
         var length = input.length;
         for (var i = 0; i < length; i++) {
             var charCode = input.charCodeAt(i);
+            // handle utf8
             if (charCode < 0x80) {
                 output.push(charCode);
             }
@@ -9453,6 +10967,9 @@ var ts;
         return output;
     }
     var base64Digits = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
+    /**
+     * Converts a string to a base-64 encoded ASCII string.
+     */
     function convertToBase64(input) {
         var result = "";
         var charCodes = getExpandedCharCodes(input);
@@ -9460,16 +10977,21 @@ var ts;
         var length = charCodes.length;
         var byte1, byte2, byte3, byte4;
         while (i < length) {
+            // Convert every 6-bits in the input 3 character points
+            // into a base64 digit
             byte1 = charCodes[i] >> 2;
             byte2 = (charCodes[i] & 3) << 4 | charCodes[i + 1] >> 4;
             byte3 = (charCodes[i + 1] & 15) << 2 | charCodes[i + 2] >> 6;
             byte4 = charCodes[i + 2] & 63;
+            // We are out of characters in the input, set the extra
+            // digits to 64 (padding character).
             if (i + 1 >= length) {
                 byte3 = byte4 = 64;
             }
             else if (i + 2 >= length) {
                 byte4 = 64;
             }
+            // Write to the output
             result += base64Digits.charAt(byte1) + base64Digits.charAt(byte2) + base64Digits.charAt(byte3) + base64Digits.charAt(byte4);
             i += 3;
         }
@@ -9495,9 +11017,12 @@ var ts;
                     i++;
                     nextCode = codes[i];
                 }
+                // `value` may be greater than 10FFFF (the maximum unicode codepoint) - JS will just make this into an invalid character for us
                 output += String.fromCharCode(value);
             }
             else {
+                // We don't want to kill the process when decoding fails (due to a following char byte not
+                // following a leading char), so we just print the (bad) value
                 output += String.fromCharCode(charCode);
                 i++;
             }
@@ -9519,9 +11044,11 @@ var ts;
         var expandedCharCodes = [];
         var i = 0;
         while (i < length) {
+            // Stop decoding once padding characters are present
             if (input.charCodeAt(i) === base64Digits.charCodeAt(64)) {
                 break;
             }
+            // convert 4 input digits into three characters, ignoring padding characters at the end
             var ch1 = base64Digits.indexOf(input[i]);
             var ch2 = base64Digits.indexOf(input[i + 1]);
             var ch3 = base64Digits.indexOf(input[i + 2]);
@@ -9529,10 +11056,10 @@ var ts;
             var code1 = ((ch1 & 63) << 2) | ((ch2 >> 4) & 3);
             var code2 = ((ch2 & 15) << 4) | ((ch3 >> 2) & 15);
             var code3 = ((ch3 & 3) << 6) | (ch4 & 63);
-            if (code2 === 0 && ch3 !== 0) {
+            if (code2 === 0 && ch3 !== 0) { // code2 decoded to zero, but ch3 was padding - elide code2 and code3
                 expandedCharCodes.push(code1);
             }
-            else if (code3 === 0 && ch4 !== 0) {
+            else if (code3 === 0 && ch4 !== 0) { // code3 decoded to zero, but ch4 was padding, elide code3
                 expandedCharCodes.push(code1, code2);
             }
             else {
@@ -9547,14 +11074,17 @@ var ts;
     var lineFeed = "\n";
     function getNewLineCharacter(options, getNewLine) {
         switch (options.newLine) {
-            case 0:
+            case 0 /* CarriageReturnLineFeed */:
                 return carriageReturnLineFeed;
-            case 1:
+            case 1 /* LineFeed */:
                 return lineFeed;
         }
         return getNewLine ? getNewLine() : ts.sys ? ts.sys.newLine : carriageReturnLineFeed;
     }
     ts.getNewLineCharacter = getNewLineCharacter;
+    /**
+     * Formats an enum value as a string for debugging and debug assertions.
+     */
     function formatEnum(value, enumObject, isFlags) {
         if (value === void 0) { value = 0; }
         var members = getEnumMembers(enumObject);
@@ -9596,61 +11126,96 @@ var ts;
         return ts.stableSort(result, function (x, y) { return ts.compareValues(x[0], y[0]); });
     }
     function formatSyntaxKind(kind) {
-        return formatEnum(kind, ts.SyntaxKind, false);
+        return formatEnum(kind, ts.SyntaxKind, /*isFlags*/ false);
     }
     ts.formatSyntaxKind = formatSyntaxKind;
     function formatModifierFlags(flags) {
-        return formatEnum(flags, ts.ModifierFlags, true);
+        return formatEnum(flags, ts.ModifierFlags, /*isFlags*/ true);
     }
     ts.formatModifierFlags = formatModifierFlags;
     function formatTransformFlags(flags) {
-        return formatEnum(flags, ts.TransformFlags, true);
+        return formatEnum(flags, ts.TransformFlags, /*isFlags*/ true);
     }
     ts.formatTransformFlags = formatTransformFlags;
     function formatEmitFlags(flags) {
-        return formatEnum(flags, ts.EmitFlags, true);
+        return formatEnum(flags, ts.EmitFlags, /*isFlags*/ true);
     }
     ts.formatEmitFlags = formatEmitFlags;
     function formatSymbolFlags(flags) {
-        return formatEnum(flags, ts.SymbolFlags, true);
+        return formatEnum(flags, ts.SymbolFlags, /*isFlags*/ true);
     }
     ts.formatSymbolFlags = formatSymbolFlags;
     function formatTypeFlags(flags) {
-        return formatEnum(flags, ts.TypeFlags, true);
+        return formatEnum(flags, ts.TypeFlags, /*isFlags*/ true);
     }
     ts.formatTypeFlags = formatTypeFlags;
     function formatObjectFlags(flags) {
-        return formatEnum(flags, ts.ObjectFlags, true);
+        return formatEnum(flags, ts.ObjectFlags, /*isFlags*/ true);
     }
     ts.formatObjectFlags = formatObjectFlags;
+    /**
+     * Creates a new TextRange from the provided pos and end.
+     *
+     * @param pos The start position.
+     * @param end The end position.
+     */
     function createRange(pos, end) {
         return { pos: pos, end: end };
     }
     ts.createRange = createRange;
+    /**
+     * Creates a new TextRange from a provided range with a new end position.
+     *
+     * @param range A TextRange.
+     * @param end The new end position.
+     */
     function moveRangeEnd(range, end) {
         return createRange(range.pos, end);
     }
     ts.moveRangeEnd = moveRangeEnd;
+    /**
+     * Creates a new TextRange from a provided range with a new start position.
+     *
+     * @param range A TextRange.
+     * @param pos The new Start position.
+     */
     function moveRangePos(range, pos) {
         return createRange(pos, range.end);
     }
     ts.moveRangePos = moveRangePos;
+    /**
+     * Moves the start position of a range past any decorators.
+     */
     function moveRangePastDecorators(node) {
         return node.decorators && node.decorators.length > 0
             ? moveRangePos(node, node.decorators.end)
             : node;
     }
     ts.moveRangePastDecorators = moveRangePastDecorators;
+    /**
+     * Moves the start position of a range past any decorators or modifiers.
+     */
     function moveRangePastModifiers(node) {
         return node.modifiers && node.modifiers.length > 0
             ? moveRangePos(node, node.modifiers.end)
             : moveRangePastDecorators(node);
     }
     ts.moveRangePastModifiers = moveRangePastModifiers;
+    /**
+     * Determines whether a TextRange has the same start and end positions.
+     *
+     * @param range A TextRange.
+     */
     function isCollapsedRange(range) {
         return range.pos === range.end;
     }
     ts.isCollapsedRange = isCollapsedRange;
+    /**
+     * Creates a new TextRange for a token at the provides start position.
+     *
+     * @param pos The start position.
+     * @param token The token.
+     */
     function createTokenRange(pos, token) {
         return createRange(pos, pos + ts.tokenToString(token).length);
     }
@@ -9684,12 +11249,16 @@ var ts;
         return ts.positionIsSynthesized(range.pos) ? -1 : ts.skipTrivia(sourceFile.text, range.pos);
     }
     ts.getStartPositionOfRange = getStartPositionOfRange;
+    /**
+     * Determines whether a name was originally the declaration name of an enum or namespace
+     * declaration.
+     */
     function isDeclarationNameOfEnumOrNamespace(node) {
         var parseNode = ts.getParseTreeNode(node);
         if (parseNode) {
             switch (parseNode.parent.kind) {
-                case 238:
-                case 239:
+                case 238 /* EnumDeclaration */:
+                case 239 /* ModuleDeclaration */:
                     return parseNode === parseNode.parent.name;
             }
         }
@@ -9704,67 +11273,79 @@ var ts;
         return node.initializer !== undefined;
     }
     function isWatchSet(options) {
+        // Firefox has Object.prototype.watch
         return options.watch && options.hasOwnProperty("watch");
     }
     ts.isWatchSet = isWatchSet;
     function getCheckFlags(symbol) {
-        return symbol.flags & 33554432 ? symbol.checkFlags : 0;
+        return symbol.flags & 33554432 /* Transient */ ? symbol.checkFlags : 0;
     }
     ts.getCheckFlags = getCheckFlags;
     function getDeclarationModifierFlagsFromSymbol(s) {
         if (s.valueDeclaration) {
             var flags = ts.getCombinedModifierFlags(s.valueDeclaration);
-            return s.parent && s.parent.flags & 32 ? flags : flags & ~28;
+            return s.parent && s.parent.flags & 32 /* Class */ ? flags : flags & ~28 /* AccessibilityModifier */;
         }
-        if (getCheckFlags(s) & 6) {
+        if (getCheckFlags(s) & 6 /* Synthetic */) {
             var checkFlags = s.checkFlags;
-            var accessModifier = checkFlags & 256 ? 8 :
-                checkFlags & 64 ? 4 :
-                    16;
-            var staticModifier = checkFlags & 512 ? 32 : 0;
+            var accessModifier = checkFlags & 256 /* ContainsPrivate */ ? 8 /* Private */ :
+                checkFlags & 64 /* ContainsPublic */ ? 4 /* Public */ :
+                    16 /* Protected */;
+            var staticModifier = checkFlags & 512 /* ContainsStatic */ ? 32 /* Static */ : 0;
             return accessModifier | staticModifier;
         }
-        if (s.flags & 4194304) {
-            return 4 | 32;
+        if (s.flags & 4194304 /* Prototype */) {
+            return 4 /* Public */ | 32 /* Static */;
         }
         return 0;
     }
     ts.getDeclarationModifierFlagsFromSymbol = getDeclarationModifierFlagsFromSymbol;
     function skipAlias(symbol, checker) {
-        return symbol.flags & 2097152 ? checker.getAliasedSymbol(symbol) : symbol;
+        return symbol.flags & 2097152 /* Alias */ ? checker.getAliasedSymbol(symbol) : symbol;
     }
     ts.skipAlias = skipAlias;
+    /** See comment on `declareModuleMember` in `binder.ts`. */
     function getCombinedLocalAndExportSymbolFlags(symbol) {
         return symbol.exportSymbol ? symbol.exportSymbol.flags | symbol.flags : symbol.flags;
     }
     ts.getCombinedLocalAndExportSymbolFlags = getCombinedLocalAndExportSymbolFlags;
     function isWriteOnlyAccess(node) {
-        return accessKind(node) === 1;
+        return accessKind(node) === 1 /* Write */;
     }
     ts.isWriteOnlyAccess = isWriteOnlyAccess;
     function isWriteAccess(node) {
-        return accessKind(node) !== 0;
+        return accessKind(node) !== 0 /* Read */;
     }
     ts.isWriteAccess = isWriteAccess;
+    var AccessKind;
+    (function (AccessKind) {
+        /** Only reads from a variable. */
+        AccessKind[AccessKind["Read"] = 0] = "Read";
+        /** Only writes to a variable without using the result. E.g.: `x++;`. */
+        AccessKind[AccessKind["Write"] = 1] = "Write";
+        /** Writes to a variable and uses the result as an expression. E.g.: `f(x++);`. */
+        AccessKind[AccessKind["ReadWrite"] = 2] = "ReadWrite";
+    })(AccessKind || (AccessKind = {}));
     function accessKind(node) {
         var parent = node.parent;
         if (!parent)
-            return 0;
+            return 0 /* Read */;
         switch (parent.kind) {
-            case 199:
-            case 198:
+            case 199 /* PostfixUnaryExpression */:
+            case 198 /* PrefixUnaryExpression */:
                 var operator = parent.operator;
-                return operator === 43 || operator === 44 ? writeOrReadWrite() : 0;
-            case 200:
+                return operator === 43 /* PlusPlusToken */ || operator === 44 /* MinusMinusToken */ ? writeOrReadWrite() : 0 /* Read */;
+            case 200 /* BinaryExpression */:
                 var _a = parent, left = _a.left, operatorToken = _a.operatorToken;
-                return left === node && isAssignmentOperator(operatorToken.kind) ? writeOrReadWrite() : 0;
-            case 185:
-                return parent.name !== node ? 0 : accessKind(parent);
+                return left === node && isAssignmentOperator(operatorToken.kind) ? writeOrReadWrite() : 0 /* Read */;
+            case 185 /* PropertyAccessExpression */:
+                return parent.name !== node ? 0 /* Read */ : accessKind(parent);
             default:
-                return 0;
+                return 0 /* Read */;
         }
         function writeOrReadWrite() {
-            return parent.parent && parent.parent.kind === 216 ? 1 : 2;
+            // If grandparent is not an ExpressionStatement, this is used as an expression in addition to having a side effect.
+            return parent.parent && parent.parent.kind === 216 /* ExpressionStatement */ ? 1 /* Write */ : 2 /* ReadWrite */;
         }
     }
     function compareDataObjects(dst, src) {
@@ -9786,30 +11367,43 @@ var ts;
         return true;
     }
     ts.compareDataObjects = compareDataObjects;
+    /**
+     * clears already present map by calling onDeleteExistingValue callback before deleting that key/value
+     */
     function clearMap(map, onDeleteValue) {
+        // Remove all
         map.forEach(onDeleteValue);
         map.clear();
     }
     ts.clearMap = clearMap;
+    /**
+     * Mutates the map with newMap such that keys in map will be same as newMap.
+     */
     function mutateMap(map, newMap, options) {
         var createNewValue = options.createNewValue, onDeleteValue = options.onDeleteValue, onExistingValue = options.onExistingValue;
+        // Needs update
         map.forEach(function (existingValue, key) {
             var valueInNewMap = newMap.get(key);
+            // Not present any more in new map, remove it
             if (valueInNewMap === undefined) {
                 map.delete(key);
                 onDeleteValue(existingValue, key);
             }
+            // If present notify about existing values
             else if (onExistingValue) {
                 onExistingValue(existingValue, valueInNewMap, key);
             }
         });
+        // Add new values that are not already present
         newMap.forEach(function (valueInNewMap, key) {
             if (!map.has(key)) {
+                // New values
                 map.set(key, createNewValue(key, valueInNewMap));
             }
         });
     }
     ts.mutateMap = mutateMap;
+    /** Calls `callback` on `directory` and every ancestor directory it has, returning the first defined result. */
     function forEachAncestorDirectory(directory, callback) {
         while (true) {
             var result = callback(directory);
@@ -9824,14 +11418,15 @@ var ts;
         }
     }
     ts.forEachAncestorDirectory = forEachAncestorDirectory;
+    // Return true if the given type is the constructor type for an abstract class
     function isAbstractConstructorType(type) {
-        return !!(getObjectFlags(type) & 16) && !!type.symbol && isAbstractConstructorSymbol(type.symbol);
+        return !!(getObjectFlags(type) & 16 /* Anonymous */) && !!type.symbol && isAbstractConstructorSymbol(type.symbol);
     }
     ts.isAbstractConstructorType = isAbstractConstructorType;
     function isAbstractConstructorSymbol(symbol) {
-        if (symbol.flags & 32) {
+        if (symbol.flags & 32 /* Class */) {
             var declaration = getClassLikeDeclarationOfSymbol(symbol);
-            return !!declaration && hasModifier(declaration, 128);
+            return !!declaration && hasModifier(declaration, 128 /* Abstract */);
         }
         return false;
     }
@@ -9841,11 +11436,11 @@ var ts;
     }
     ts.getClassLikeDeclarationOfSymbol = getClassLikeDeclarationOfSymbol;
     function getObjectFlags(type) {
-        return type.flags & 131072 ? type.objectFlags : 0;
+        return type.flags & 131072 /* Object */ ? type.objectFlags : 0;
     }
     ts.getObjectFlags = getObjectFlags;
     function typeHasCallOrConstructSignatures(type, checker) {
-        return checker.getSignaturesOfType(type, 0).length !== 0 || checker.getSignaturesOfType(type, 1).length !== 0;
+        return checker.getSignaturesOfType(type, 0 /* Call */).length !== 0 || checker.getSignaturesOfType(type, 1 /* Construct */).length !== 0;
     }
     ts.typeHasCallOrConstructSignatures = typeHasCallOrConstructSignatures;
     function forSomeAncestorDirectory(directory, callback) {
@@ -9867,6 +11462,7 @@ var ts;
             if (nodeIsPresent(child))
                 lastChild = child;
         }, function (children) {
+            // As an optimization, jump straight to the end of the list.
             for (var i = children.length - 1; i >= 0; i--) {
                 if (nodeIsPresent(children[i])) {
                     lastChild = children[i];
@@ -9895,14 +11491,14 @@ var ts;
 (function (ts) {
     function getDefaultLibFileName(options) {
         switch (options.target) {
-            case 6:
+            case 6 /* ESNext */:
                 return "lib.esnext.full.d.ts";
-            case 4:
+            case 4 /* ES2017 */:
                 return "lib.es2017.full.d.ts";
-            case 3:
+            case 3 /* ES2016 */:
                 return "lib.es2016.full.d.ts";
-            case 2:
-                return "lib.es6.d.ts";
+            case 2 /* ES2015 */:
+                return "lib.es6.d.ts"; // We don't use lib.es2015.full.d.ts due to breaking change.
             default:
                 return "lib.d.ts";
         }
@@ -9920,6 +11516,7 @@ var ts;
         return position >= span.start && position < textSpanEnd(span);
     }
     ts.textSpanContainsPosition = textSpanContainsPosition;
+    // Returns true if 'span' contains 'other'.
     function textSpanContainsTextSpan(span, other) {
         return other.start >= span.start && textSpanEnd(other) <= textSpanEnd(span);
     }
@@ -9967,6 +11564,7 @@ var ts;
         return { start: start, length: length };
     }
     ts.createTextSpan = createTextSpan;
+    /* @internal */
     function createTextRange(pos, end) {
         if (end === void 0) { end = pos; }
         ts.Debug.assert(end >= pos);
@@ -9993,6 +11591,14 @@ var ts;
     }
     ts.createTextChangeRange = createTextChangeRange;
     ts.unchangedTextChangeRange = createTextChangeRange(createTextSpan(0, 0), 0);
+    /**
+     * Called to merge all the changes that occurred across several versions of a script snapshot
+     * into a single change.  i.e. if a user keeps making successive edits to a script we will
+     * have a text change from V1 to V2, V2 to V3, ..., Vn.
+     *
+     * This function will then merge those changes into a single change range valid between V1 and
+     * Vn.
+     */
     function collapseTextChangeRangesAcrossMultipleVersions(changes) {
         if (changes.length === 0) {
             return ts.unchangedTextChangeRange;
@@ -10000,12 +11606,93 @@ var ts;
         if (changes.length === 1) {
             return changes[0];
         }
+        // We change from talking about { { oldStart, oldLength }, newLength } to { oldStart, oldEnd, newEnd }
+        // as it makes things much easier to reason about.
         var change0 = changes[0];
         var oldStartN = change0.span.start;
         var oldEndN = textSpanEnd(change0.span);
         var newEndN = oldStartN + change0.newLength;
         for (var i = 1; i < changes.length; i++) {
             var nextChange = changes[i];
+            // Consider the following case:
+            // i.e. two edits.  The first represents the text change range { { 10, 50 }, 30 }.  i.e. The span starting
+            // at 10, with length 50 is reduced to length 30.  The second represents the text change range { { 30, 30 }, 40 }.
+            // i.e. the span starting at 30 with length 30 is increased to length 40.
+            //
+            //      0         10        20        30        40        50        60        70        80        90        100
+            //      -------------------------------------------------------------------------------------------------------
+            //                |                                                 /
+            //                |                                            /----
+            //  T1            |                                       /----
+            //                |                                  /----
+            //                |                             /----
+            //      -------------------------------------------------------------------------------------------------------
+            //                                     |                            \
+            //                                     |                               \
+            //   T2                                |                                 \
+            //                                     |                                   \
+            //                                     |                                      \
+            //      -------------------------------------------------------------------------------------------------------
+            //
+            // Merging these turns out to not be too difficult.  First, determining the new start of the change is trivial
+            // it's just the min of the old and new starts.  i.e.:
+            //
+            //      0         10        20        30        40        50        60        70        80        90        100
+            //      ------------------------------------------------------------*------------------------------------------
+            //                |                                                 /
+            //                |                                            /----
+            //  T1            |                                       /----
+            //                |                                  /----
+            //                |                             /----
+            //      ----------------------------------------$-------------------$------------------------------------------
+            //                .                    |                            \
+            //                .                    |                               \
+            //   T2           .                    |                                 \
+            //                .                    |                                   \
+            //                .                    |                                      \
+            //      ----------------------------------------------------------------------*--------------------------------
+            //
+            // (Note the dots represent the newly inferred start.
+            // Determining the new and old end is also pretty simple.  Basically it boils down to paying attention to the
+            // absolute positions at the asterisks, and the relative change between the dollar signs. Basically, we see
+            // which if the two $'s precedes the other, and we move that one forward until they line up.  in this case that
+            // means:
+            //
+            //      0         10        20        30        40        50        60        70        80        90        100
+            //      --------------------------------------------------------------------------------*----------------------
+            //                |                                                                     /
+            //                |                                                                /----
+            //  T1            |                                                           /----
+            //                |                                                      /----
+            //                |                                                 /----
+            //      ------------------------------------------------------------$------------------------------------------
+            //                .                    |                            \
+            //                .                    |                               \
+            //   T2           .                    |                                 \
+            //                .                    |                                   \
+            //                .                    |                                      \
+            //      ----------------------------------------------------------------------*--------------------------------
+            //
+            // In other words (in this case), we're recognizing that the second edit happened after where the first edit
+            // ended with a delta of 20 characters (60 - 40).  Thus, if we go back in time to where the first edit started
+            // that's the same as if we started at char 80 instead of 60.
+            //
+            // As it so happens, the same logic applies if the second edit precedes the first edit.  In that case rather
+            // than pushing the first edit forward to match the second, we'll push the second edit forward to match the
+            // first.
+            //
+            // In this case that means we have { oldStart: 10, oldEnd: 80, newEnd: 70 } or, in TextChangeRange
+            // semantics: { { start: 10, length: 70 }, newLength: 60 }
+            //
+            // The math then works out as follows.
+            // If we have { oldStart1, oldEnd1, newEnd1 } and { oldStart2, oldEnd2, newEnd2 } then we can compute the
+            // final result like so:
+            //
+            // {
+            //      oldStart3: Min(oldStart1, oldStart2),
+            //      oldEnd3: Max(oldEnd1, oldEnd1 + (oldEnd2 - newEnd1)),
+            //      newEnd3: Max(newEnd2, newEnd2 + (newEnd1 - oldEnd2))
+            // }
             var oldStart1 = oldStartN;
             var oldEnd1 = oldEndN;
             var newEnd1 = newEndN;
@@ -10016,13 +11703,13 @@ var ts;
             oldEndN = Math.max(oldEnd1, oldEnd1 + (oldEnd2 - newEnd1));
             newEndN = Math.max(newEnd2, newEnd2 + (newEnd1 - oldEnd2));
         }
-        return createTextChangeRange(createTextSpanFromBounds(oldStartN, oldEndN), newEndN - oldStartN);
+        return createTextChangeRange(createTextSpanFromBounds(oldStartN, oldEndN), /*newLength*/ newEndN - oldStartN);
     }
     ts.collapseTextChangeRangesAcrossMultipleVersions = collapseTextChangeRangesAcrossMultipleVersions;
     function getTypeParameterOwner(d) {
-        if (d && d.kind === 148) {
+        if (d && d.kind === 148 /* TypeParameter */) {
             for (var current = d; current; current = current.parent) {
-                if (ts.isFunctionLike(current) || ts.isClassLike(current) || current.kind === 236) {
+                if (ts.isFunctionLike(current) || ts.isClassLike(current) || current.kind === 236 /* InterfaceDeclaration */) {
                     return current;
                 }
             }
@@ -10030,7 +11717,7 @@ var ts;
     }
     ts.getTypeParameterOwner = getTypeParameterOwner;
     function isParameterPropertyDeclaration(node) {
-        return ts.hasModifier(node, 92) && node.parent.kind === 155;
+        return ts.hasModifier(node, 92 /* ParameterPropertyModifier */) && node.parent.kind === 155 /* Constructor */;
     }
     ts.isParameterPropertyDeclaration = isParameterPropertyDeclaration;
     function isEmptyBindingPattern(node) {
@@ -10048,7 +11735,7 @@ var ts;
     }
     ts.isEmptyBindingElement = isEmptyBindingElement;
     function walkUpBindingElementsAndPatterns(node) {
-        while (node && (node.kind === 182 || ts.isBindingPattern(node))) {
+        while (node && (node.kind === 182 /* BindingElement */ || ts.isBindingPattern(node))) {
             node = node.parent;
         }
         return node;
@@ -10056,35 +11743,46 @@ var ts;
     function getCombinedModifierFlags(node) {
         node = walkUpBindingElementsAndPatterns(node);
         var flags = ts.getModifierFlags(node);
-        if (node.kind === 232) {
+        if (node.kind === 232 /* VariableDeclaration */) {
             node = node.parent;
         }
-        if (node && node.kind === 233) {
+        if (node && node.kind === 233 /* VariableDeclarationList */) {
             flags |= ts.getModifierFlags(node);
             node = node.parent;
         }
-        if (node && node.kind === 214) {
+        if (node && node.kind === 214 /* VariableStatement */) {
             flags |= ts.getModifierFlags(node);
         }
         return flags;
     }
     ts.getCombinedModifierFlags = getCombinedModifierFlags;
+    // Returns the node flags for this node and all relevant parent nodes.  This is done so that
+    // nodes like variable declarations and binding elements can returned a view of their flags
+    // that includes the modifiers from their container.  i.e. flags like export/declare aren't
+    // stored on the variable declaration directly, but on the containing variable statement
+    // (if it has one).  Similarly, flags for let/const are store on the variable declaration
+    // list.  By calling this function, all those flags are combined so that the client can treat
+    // the node as if it actually had those flags.
     function getCombinedNodeFlags(node) {
         node = walkUpBindingElementsAndPatterns(node);
         var flags = node.flags;
-        if (node.kind === 232) {
+        if (node.kind === 232 /* VariableDeclaration */) {
             node = node.parent;
         }
-        if (node && node.kind === 233) {
+        if (node && node.kind === 233 /* VariableDeclarationList */) {
             flags |= node.flags;
             node = node.parent;
         }
-        if (node && node.kind === 214) {
+        if (node && node.kind === 214 /* VariableStatement */) {
             flags |= node.flags;
         }
         return flags;
     }
     ts.getCombinedNodeFlags = getCombinedNodeFlags;
+    /**
+     * Checks to see if the locale is in the appropriate format,
+     * and if it is, attempts to set the appropriate language.
+     */
     function validateLocaleAndSetLanguage(locale, sys, errors) {
         var matchResult = /^([a-z]+)([_\-]([a-z]+))?$/.exec(locale.toLowerCase());
         if (!matchResult) {
@@ -10095,9 +11793,12 @@ var ts;
         }
         var language = matchResult[1];
         var territory = matchResult[3];
+        // First try the entire locale, then fall back to just language if that's all we have.
+        // Either ways do not fail, and fallback to the English diagnostic strings.
         if (!trySetLanguageAndTerritory(language, territory, errors)) {
-            trySetLanguageAndTerritory(language, undefined, errors);
+            trySetLanguageAndTerritory(language, /*territory*/ undefined, errors);
         }
+        // Set the UI locale for string collation
         ts.setUILocale(locale);
         function trySetLanguageAndTerritory(language, territory, errors) {
             var compilerFilePath = ts.normalizePath(sys.getExecutingFilePath());
@@ -10110,6 +11811,7 @@ var ts;
             if (!sys.fileExists(filePath)) {
                 return false;
             }
+            // TODO: Add codePage support for readFile?
             var fileContents = "";
             try {
                 fileContents = sys.readFile(filePath);
@@ -10121,6 +11823,7 @@ var ts;
                 return false;
             }
             try {
+                // tslint:disable-next-line no-unnecessary-qualifier (making clear this is a global mutation!)
                 ts.localizedDiagnosticMessages = JSON.parse(fileContents);
             }
             catch (_a) {
@@ -10142,8 +11845,13 @@ var ts;
         return !nodeTest || nodeTest(node) ? node : undefined;
     }
     ts.getOriginalNode = getOriginalNode;
+    /**
+     * Gets a value indicating whether a node originated in the parse tree.
+     *
+     * @param node The node to test.
+     */
     function isParseTreeNode(node) {
-        return (node.flags & 8) === 0;
+        return (node.flags & 8 /* Synthesized */) === 0;
     }
     ts.isParseTreeNode = isParseTreeNode;
     function getParseTreeNode(node, nodeTest) {
@@ -10157,9 +11865,15 @@ var ts;
         return undefined;
     }
     ts.getParseTreeNode = getParseTreeNode;
+    /**
+     * Remove extra underscore from escaped identifier text content.
+     *
+     * @param identifier The escaped identifier text.
+     * @returns The unescaped identifier text.
+     */
     function unescapeLeadingUnderscores(identifier) {
         var id = identifier;
-        return id.length >= 3 && id.charCodeAt(0) === 95 && id.charCodeAt(1) === 95 && id.charCodeAt(2) === 95 ? id.substr(1) : id;
+        return id.length >= 3 && id.charCodeAt(0) === 95 /* _ */ && id.charCodeAt(1) === 95 /* _ */ && id.charCodeAt(2) === 95 /* _ */ ? id.substr(1) : id;
     }
     ts.unescapeLeadingUnderscores = unescapeLeadingUnderscores;
     function idText(identifier) {
@@ -10170,42 +11884,55 @@ var ts;
         return unescapeLeadingUnderscores(symbol.escapedName);
     }
     ts.symbolName = symbolName;
+    /**
+     * Remove extra underscore from escaped identifier text content.
+     * @deprecated Use `id.text` for the unescaped text.
+     * @param identifier The escaped identifier text.
+     * @returns The unescaped identifier text.
+     */
     function unescapeIdentifier(id) {
         return id;
     }
     ts.unescapeIdentifier = unescapeIdentifier;
+    /**
+     * A JSDocTypedef tag has an _optional_ name field - if a name is not directly present, we should
+     * attempt to draw the name from the node the declaration is on (as that declaration is what its' symbol
+     * will be merged with)
+     */
     function nameForNamelessJSDocTypedef(declaration) {
         var hostNode = declaration.parent.parent;
         if (!hostNode) {
             return undefined;
         }
+        // Covers classes, functions - any named declaration host node
         if (ts.isDeclaration(hostNode)) {
             return getDeclarationIdentifier(hostNode);
         }
+        // Covers remaining cases
         switch (hostNode.kind) {
-            case 214:
+            case 214 /* VariableStatement */:
                 if (hostNode.declarationList && hostNode.declarationList.declarations[0]) {
                     return getDeclarationIdentifier(hostNode.declarationList.declarations[0]);
                 }
                 return undefined;
-            case 216:
+            case 216 /* ExpressionStatement */:
                 var expr = hostNode.expression;
                 switch (expr.kind) {
-                    case 185:
+                    case 185 /* PropertyAccessExpression */:
                         return expr.name;
-                    case 186:
+                    case 186 /* ElementAccessExpression */:
                         var arg = expr.argumentExpression;
                         if (ts.isIdentifier(arg)) {
                             return arg;
                         }
                 }
                 return undefined;
-            case 1:
+            case 1 /* EndOfFileToken */:
                 return undefined;
-            case 191: {
+            case 191 /* ParenthesizedExpression */: {
                 return getDeclarationIdentifier(hostNode.expression);
             }
-            case 228: {
+            case 228 /* LabeledStatement */: {
                 if (ts.isDeclaration(hostNode.statement) || ts.isExpression(hostNode.statement)) {
                     return getDeclarationIdentifier(hostNode.statement);
                 }
@@ -10223,48 +11950,50 @@ var ts;
         return declaration.name || nameForNamelessJSDocTypedef(declaration);
     }
     ts.getNameOfJSDocTypedef = getNameOfJSDocTypedef;
+    /** @internal */
     function isNamedDeclaration(node) {
-        return !!node.name;
+        return !!node.name; // A 'name' property should always be a DeclarationName.
     }
     ts.isNamedDeclaration = isNamedDeclaration;
+    // TODO: GH#18217 This is often used as if it returns a defined result
     function getNameOfDeclaration(declaration) {
         if (!declaration) {
             return undefined;
         }
         switch (declaration.kind) {
-            case 205:
-            case 192:
+            case 205 /* ClassExpression */:
+            case 192 /* FunctionExpression */:
                 if (!declaration.name) {
                     return getAssignedName(declaration);
                 }
                 break;
-            case 71:
+            case 71 /* Identifier */:
                 return declaration;
-            case 298:
-            case 293: {
+            case 298 /* JSDocPropertyTag */:
+            case 293 /* JSDocParameterTag */: {
                 var name = declaration.name;
-                if (name.kind === 146) {
+                if (name.kind === 146 /* QualifiedName */) {
                     return name.right;
                 }
                 break;
             }
-            case 200: {
+            case 200 /* BinaryExpression */: {
                 var expr = declaration;
                 switch (ts.getSpecialPropertyAssignmentKind(expr)) {
-                    case 1:
-                    case 4:
-                    case 5:
-                    case 3:
+                    case 1 /* ExportsProperty */:
+                    case 4 /* ThisProperty */:
+                    case 5 /* Property */:
+                    case 3 /* PrototypeProperty */:
                         return expr.left.name;
                     default:
                         return undefined;
                 }
             }
-            case 292:
+            case 292 /* JSDocCallbackTag */:
                 return declaration.name;
-            case 297:
+            case 297 /* JSDocTypedefTag */:
                 return getNameOfJSDocTypedef(declaration);
-            case 249: {
+            case 249 /* ExportAssignment */: {
                 var expression = declaration.expression;
                 return ts.isIdentifier(expression) ? expression : undefined;
             }
@@ -10288,6 +12017,19 @@ var ts;
             }
         }
     }
+    /**
+     * Gets the JSDoc parameter tags for the node if present.
+     *
+     * @remarks Returns any JSDoc param tag that matches the provided
+     * parameter, whether a param tag on a containing function
+     * expression, or a param tag on a variable declaration whose
+     * initializer is the containing function. The tags closest to the
+     * node are returned first, so in the previous example, the param
+     * tag on the containing function expression would be first.
+     *
+     * Does not return tags for binding patterns, because JSDoc matches
+     * parameters by name and binding patterns do not have a name.
+     */
     function getJSDocParameterTags(param) {
         if (param.name) {
             if (ts.isIdentifier(param.name)) {
@@ -10303,30 +12045,43 @@ var ts;
                 }
             }
         }
+        // return empty array for: out-of-order binding patterns and JSDoc function syntax, which has un-named parameters
         return ts.emptyArray;
     }
     ts.getJSDocParameterTags = getJSDocParameterTags;
+    /**
+     * Return true if the node has JSDoc parameter tags.
+     *
+     * @remarks Includes parameter tags that are not directly on the node,
+     * for example on a variable declaration whose initializer is a function expression.
+     */
     function hasJSDocParameterTags(node) {
         return !!getFirstJSDocTag(node, ts.isJSDocParameterTag);
     }
     ts.hasJSDocParameterTags = hasJSDocParameterTags;
+    /** Gets the JSDoc augments tag for the node if present */
     function getJSDocAugmentsTag(node) {
         return getFirstJSDocTag(node, ts.isJSDocAugmentsTag);
     }
     ts.getJSDocAugmentsTag = getJSDocAugmentsTag;
+    /** Gets the JSDoc class tag for the node if present */
     function getJSDocClassTag(node) {
         return getFirstJSDocTag(node, ts.isJSDocClassTag);
     }
     ts.getJSDocClassTag = getJSDocClassTag;
+    /** Gets the JSDoc return tag for the node if present */
     function getJSDocReturnTag(node) {
         return getFirstJSDocTag(node, ts.isJSDocReturnTag);
     }
     ts.getJSDocReturnTag = getJSDocReturnTag;
+    /** Gets the JSDoc template tag for the node if present */
     function getJSDocTemplateTag(node) {
         return getFirstJSDocTag(node, ts.isJSDocTemplateTag);
     }
     ts.getJSDocTemplateTag = getJSDocTemplateTag;
+    /** Gets the JSDoc type tag for the node if present and valid */
     function getJSDocTypeTag(node) {
+        // We should have already issued an error if there were multiple type jsdocs, so just use the first one.
         var tag = getFirstJSDocTag(node, ts.isJSDocTypeTag);
         if (tag && tag.typeExpression && tag.typeExpression.type) {
             return tag;
@@ -10334,6 +12089,17 @@ var ts;
         return undefined;
     }
     ts.getJSDocTypeTag = getJSDocTypeTag;
+    /**
+     * Gets the type node for the node if provided via JSDoc.
+     *
+     * @remarks The search includes any JSDoc param tag that relates
+     * to the provided parameter, for example a type tag on the
+     * parameter itself, or a param tag on a containing function
+     * expression, or a param tag on a variable declaration whose
+     * initializer is the containing function. The tags closest to the
+     * node are examined first, so in the previous example, the type
+     * tag directly on the node would be returned.
+     */
     function getJSDocType(node) {
         var tag = getFirstJSDocTag(node, ts.isJSDocTypeTag);
         if (!tag && ts.isParameter(node)) {
@@ -10342,13 +12108,21 @@ var ts;
         return tag && tag.typeExpression && tag.typeExpression.type;
     }
     ts.getJSDocType = getJSDocType;
+    /**
+     * Gets the return type node for the node if provided via JSDoc's return tag.
+     *
+     * @remarks `getJSDocReturnTag` just gets the whole JSDoc tag. This function
+     * gets the type from inside the braces.
+     */
     function getJSDocReturnType(node) {
         var returnTag = getJSDocReturnTag(node);
         return returnTag && returnTag.typeExpression && returnTag.typeExpression.type;
     }
     ts.getJSDocReturnType = getJSDocReturnType;
+    /** Get all JSDoc tags related to a node, including those on parent nodes. */
     function getJSDocTags(node) {
         var tags = node.jsDocCache;
+        // If cache is 'null', that means we did the work of searching for JSDoc tags and came up with nothing.
         if (tags === undefined) {
             var comments = ts.getJSDocCommentsAndTags(node);
             ts.Debug.assert(comments.length < 2 || comments[0] !== comments[1]);
@@ -10357,702 +12131,745 @@ var ts;
         return tags;
     }
     ts.getJSDocTags = getJSDocTags;
+    /** Get the first JSDoc tag of a specified kind, or undefined if not present. */
     function getFirstJSDocTag(node, predicate) {
         return ts.find(getJSDocTags(node), predicate);
     }
+    /** Gets all JSDoc tags of a specified kind, or undefined if not present. */
     function getAllJSDocTagsOfKind(node, kind) {
         return getJSDocTags(node).filter(function (doc) { return doc.kind === kind; });
     }
     ts.getAllJSDocTagsOfKind = getAllJSDocTagsOfKind;
 })(ts || (ts = {}));
+// Simple node tests of the form `node.kind === SyntaxKind.Foo`.
 (function (ts) {
+    // Literals
     function isNumericLiteral(node) {
-        return node.kind === 8;
+        return node.kind === 8 /* NumericLiteral */;
     }
     ts.isNumericLiteral = isNumericLiteral;
     function isStringLiteral(node) {
-        return node.kind === 9;
+        return node.kind === 9 /* StringLiteral */;
     }
     ts.isStringLiteral = isStringLiteral;
     function isJsxText(node) {
-        return node.kind === 10;
+        return node.kind === 10 /* JsxText */;
     }
     ts.isJsxText = isJsxText;
     function isRegularExpressionLiteral(node) {
-        return node.kind === 12;
+        return node.kind === 12 /* RegularExpressionLiteral */;
     }
     ts.isRegularExpressionLiteral = isRegularExpressionLiteral;
     function isNoSubstitutionTemplateLiteral(node) {
-        return node.kind === 13;
+        return node.kind === 13 /* NoSubstitutionTemplateLiteral */;
     }
     ts.isNoSubstitutionTemplateLiteral = isNoSubstitutionTemplateLiteral;
+    // Pseudo-literals
     function isTemplateHead(node) {
-        return node.kind === 14;
+        return node.kind === 14 /* TemplateHead */;
     }
     ts.isTemplateHead = isTemplateHead;
     function isTemplateMiddle(node) {
-        return node.kind === 15;
+        return node.kind === 15 /* TemplateMiddle */;
     }
     ts.isTemplateMiddle = isTemplateMiddle;
     function isTemplateTail(node) {
-        return node.kind === 16;
+        return node.kind === 16 /* TemplateTail */;
     }
     ts.isTemplateTail = isTemplateTail;
     function isIdentifier(node) {
-        return node.kind === 71;
+        return node.kind === 71 /* Identifier */;
     }
     ts.isIdentifier = isIdentifier;
+    // Names
     function isQualifiedName(node) {
-        return node.kind === 146;
+        return node.kind === 146 /* QualifiedName */;
     }
     ts.isQualifiedName = isQualifiedName;
     function isComputedPropertyName(node) {
-        return node.kind === 147;
+        return node.kind === 147 /* ComputedPropertyName */;
     }
     ts.isComputedPropertyName = isComputedPropertyName;
+    // Signature elements
     function isTypeParameterDeclaration(node) {
-        return node.kind === 148;
+        return node.kind === 148 /* TypeParameter */;
     }
     ts.isTypeParameterDeclaration = isTypeParameterDeclaration;
     function isParameter(node) {
-        return node.kind === 149;
+        return node.kind === 149 /* Parameter */;
     }
     ts.isParameter = isParameter;
     function isDecorator(node) {
-        return node.kind === 150;
+        return node.kind === 150 /* Decorator */;
     }
     ts.isDecorator = isDecorator;
+    // TypeMember
     function isPropertySignature(node) {
-        return node.kind === 151;
+        return node.kind === 151 /* PropertySignature */;
     }
     ts.isPropertySignature = isPropertySignature;
     function isPropertyDeclaration(node) {
-        return node.kind === 152;
+        return node.kind === 152 /* PropertyDeclaration */;
     }
     ts.isPropertyDeclaration = isPropertyDeclaration;
     function isMethodSignature(node) {
-        return node.kind === 153;
+        return node.kind === 153 /* MethodSignature */;
     }
     ts.isMethodSignature = isMethodSignature;
     function isMethodDeclaration(node) {
-        return node.kind === 154;
+        return node.kind === 154 /* MethodDeclaration */;
     }
     ts.isMethodDeclaration = isMethodDeclaration;
     function isConstructorDeclaration(node) {
-        return node.kind === 155;
+        return node.kind === 155 /* Constructor */;
     }
     ts.isConstructorDeclaration = isConstructorDeclaration;
     function isGetAccessorDeclaration(node) {
-        return node.kind === 156;
+        return node.kind === 156 /* GetAccessor */;
     }
     ts.isGetAccessorDeclaration = isGetAccessorDeclaration;
     function isSetAccessorDeclaration(node) {
-        return node.kind === 157;
+        return node.kind === 157 /* SetAccessor */;
     }
     ts.isSetAccessorDeclaration = isSetAccessorDeclaration;
     function isCallSignatureDeclaration(node) {
-        return node.kind === 158;
+        return node.kind === 158 /* CallSignature */;
     }
     ts.isCallSignatureDeclaration = isCallSignatureDeclaration;
     function isConstructSignatureDeclaration(node) {
-        return node.kind === 159;
+        return node.kind === 159 /* ConstructSignature */;
     }
     ts.isConstructSignatureDeclaration = isConstructSignatureDeclaration;
     function isIndexSignatureDeclaration(node) {
-        return node.kind === 160;
+        return node.kind === 160 /* IndexSignature */;
     }
     ts.isIndexSignatureDeclaration = isIndexSignatureDeclaration;
+    /* @internal */
     function isGetOrSetAccessorDeclaration(node) {
-        return node.kind === 157 || node.kind === 156;
+        return node.kind === 157 /* SetAccessor */ || node.kind === 156 /* GetAccessor */;
     }
     ts.isGetOrSetAccessorDeclaration = isGetOrSetAccessorDeclaration;
+    // Type
     function isTypePredicateNode(node) {
-        return node.kind === 161;
+        return node.kind === 161 /* TypePredicate */;
     }
     ts.isTypePredicateNode = isTypePredicateNode;
     function isTypeReferenceNode(node) {
-        return node.kind === 162;
+        return node.kind === 162 /* TypeReference */;
     }
     ts.isTypeReferenceNode = isTypeReferenceNode;
     function isFunctionTypeNode(node) {
-        return node.kind === 163;
+        return node.kind === 163 /* FunctionType */;
     }
     ts.isFunctionTypeNode = isFunctionTypeNode;
     function isConstructorTypeNode(node) {
-        return node.kind === 164;
+        return node.kind === 164 /* ConstructorType */;
     }
     ts.isConstructorTypeNode = isConstructorTypeNode;
     function isTypeQueryNode(node) {
-        return node.kind === 165;
+        return node.kind === 165 /* TypeQuery */;
     }
     ts.isTypeQueryNode = isTypeQueryNode;
     function isTypeLiteralNode(node) {
-        return node.kind === 166;
+        return node.kind === 166 /* TypeLiteral */;
     }
     ts.isTypeLiteralNode = isTypeLiteralNode;
     function isArrayTypeNode(node) {
-        return node.kind === 167;
+        return node.kind === 167 /* ArrayType */;
     }
     ts.isArrayTypeNode = isArrayTypeNode;
     function isTupleTypeNode(node) {
-        return node.kind === 168;
+        return node.kind === 168 /* TupleType */;
     }
     ts.isTupleTypeNode = isTupleTypeNode;
     function isUnionTypeNode(node) {
-        return node.kind === 169;
+        return node.kind === 169 /* UnionType */;
     }
     ts.isUnionTypeNode = isUnionTypeNode;
     function isIntersectionTypeNode(node) {
-        return node.kind === 170;
+        return node.kind === 170 /* IntersectionType */;
     }
     ts.isIntersectionTypeNode = isIntersectionTypeNode;
     function isConditionalTypeNode(node) {
-        return node.kind === 171;
+        return node.kind === 171 /* ConditionalType */;
     }
     ts.isConditionalTypeNode = isConditionalTypeNode;
     function isInferTypeNode(node) {
-        return node.kind === 172;
+        return node.kind === 172 /* InferType */;
     }
     ts.isInferTypeNode = isInferTypeNode;
     function isParenthesizedTypeNode(node) {
-        return node.kind === 173;
+        return node.kind === 173 /* ParenthesizedType */;
     }
     ts.isParenthesizedTypeNode = isParenthesizedTypeNode;
     function isThisTypeNode(node) {
-        return node.kind === 174;
+        return node.kind === 174 /* ThisType */;
     }
     ts.isThisTypeNode = isThisTypeNode;
     function isTypeOperatorNode(node) {
-        return node.kind === 175;
+        return node.kind === 175 /* TypeOperator */;
     }
     ts.isTypeOperatorNode = isTypeOperatorNode;
     function isIndexedAccessTypeNode(node) {
-        return node.kind === 176;
+        return node.kind === 176 /* IndexedAccessType */;
     }
     ts.isIndexedAccessTypeNode = isIndexedAccessTypeNode;
     function isMappedTypeNode(node) {
-        return node.kind === 177;
+        return node.kind === 177 /* MappedType */;
     }
     ts.isMappedTypeNode = isMappedTypeNode;
     function isLiteralTypeNode(node) {
-        return node.kind === 178;
+        return node.kind === 178 /* LiteralType */;
     }
     ts.isLiteralTypeNode = isLiteralTypeNode;
     function isImportTypeNode(node) {
-        return node.kind === 179;
+        return node.kind === 179 /* ImportType */;
     }
     ts.isImportTypeNode = isImportTypeNode;
+    // Binding patterns
     function isObjectBindingPattern(node) {
-        return node.kind === 180;
+        return node.kind === 180 /* ObjectBindingPattern */;
     }
     ts.isObjectBindingPattern = isObjectBindingPattern;
     function isArrayBindingPattern(node) {
-        return node.kind === 181;
+        return node.kind === 181 /* ArrayBindingPattern */;
     }
     ts.isArrayBindingPattern = isArrayBindingPattern;
     function isBindingElement(node) {
-        return node.kind === 182;
+        return node.kind === 182 /* BindingElement */;
     }
     ts.isBindingElement = isBindingElement;
+    // Expression
     function isArrayLiteralExpression(node) {
-        return node.kind === 183;
+        return node.kind === 183 /* ArrayLiteralExpression */;
     }
     ts.isArrayLiteralExpression = isArrayLiteralExpression;
     function isObjectLiteralExpression(node) {
-        return node.kind === 184;
+        return node.kind === 184 /* ObjectLiteralExpression */;
     }
     ts.isObjectLiteralExpression = isObjectLiteralExpression;
     function isPropertyAccessExpression(node) {
-        return node.kind === 185;
+        return node.kind === 185 /* PropertyAccessExpression */;
     }
     ts.isPropertyAccessExpression = isPropertyAccessExpression;
     function isElementAccessExpression(node) {
-        return node.kind === 186;
+        return node.kind === 186 /* ElementAccessExpression */;
     }
     ts.isElementAccessExpression = isElementAccessExpression;
     function isCallExpression(node) {
-        return node.kind === 187;
+        return node.kind === 187 /* CallExpression */;
     }
     ts.isCallExpression = isCallExpression;
     function isNewExpression(node) {
-        return node.kind === 188;
+        return node.kind === 188 /* NewExpression */;
     }
     ts.isNewExpression = isNewExpression;
     function isTaggedTemplateExpression(node) {
-        return node.kind === 189;
+        return node.kind === 189 /* TaggedTemplateExpression */;
     }
     ts.isTaggedTemplateExpression = isTaggedTemplateExpression;
     function isTypeAssertion(node) {
-        return node.kind === 190;
+        return node.kind === 190 /* TypeAssertionExpression */;
     }
     ts.isTypeAssertion = isTypeAssertion;
     function isParenthesizedExpression(node) {
-        return node.kind === 191;
+        return node.kind === 191 /* ParenthesizedExpression */;
     }
     ts.isParenthesizedExpression = isParenthesizedExpression;
     function skipPartiallyEmittedExpressions(node) {
-        while (node.kind === 301) {
+        while (node.kind === 301 /* PartiallyEmittedExpression */) {
             node = node.expression;
         }
         return node;
     }
     ts.skipPartiallyEmittedExpressions = skipPartiallyEmittedExpressions;
     function isFunctionExpression(node) {
-        return node.kind === 192;
+        return node.kind === 192 /* FunctionExpression */;
     }
     ts.isFunctionExpression = isFunctionExpression;
     function isArrowFunction(node) {
-        return node.kind === 193;
+        return node.kind === 193 /* ArrowFunction */;
     }
     ts.isArrowFunction = isArrowFunction;
     function isDeleteExpression(node) {
-        return node.kind === 194;
+        return node.kind === 194 /* DeleteExpression */;
     }
     ts.isDeleteExpression = isDeleteExpression;
     function isTypeOfExpression(node) {
-        return node.kind === 195;
+        return node.kind === 195 /* TypeOfExpression */;
     }
     ts.isTypeOfExpression = isTypeOfExpression;
     function isVoidExpression(node) {
-        return node.kind === 196;
+        return node.kind === 196 /* VoidExpression */;
     }
     ts.isVoidExpression = isVoidExpression;
     function isAwaitExpression(node) {
-        return node.kind === 197;
+        return node.kind === 197 /* AwaitExpression */;
     }
     ts.isAwaitExpression = isAwaitExpression;
     function isPrefixUnaryExpression(node) {
-        return node.kind === 198;
+        return node.kind === 198 /* PrefixUnaryExpression */;
     }
     ts.isPrefixUnaryExpression = isPrefixUnaryExpression;
     function isPostfixUnaryExpression(node) {
-        return node.kind === 199;
+        return node.kind === 199 /* PostfixUnaryExpression */;
     }
     ts.isPostfixUnaryExpression = isPostfixUnaryExpression;
     function isBinaryExpression(node) {
-        return node.kind === 200;
+        return node.kind === 200 /* BinaryExpression */;
     }
     ts.isBinaryExpression = isBinaryExpression;
     function isConditionalExpression(node) {
-        return node.kind === 201;
+        return node.kind === 201 /* ConditionalExpression */;
     }
     ts.isConditionalExpression = isConditionalExpression;
     function isTemplateExpression(node) {
-        return node.kind === 202;
+        return node.kind === 202 /* TemplateExpression */;
     }
     ts.isTemplateExpression = isTemplateExpression;
     function isYieldExpression(node) {
-        return node.kind === 203;
+        return node.kind === 203 /* YieldExpression */;
     }
     ts.isYieldExpression = isYieldExpression;
     function isSpreadElement(node) {
-        return node.kind === 204;
+        return node.kind === 204 /* SpreadElement */;
     }
     ts.isSpreadElement = isSpreadElement;
     function isClassExpression(node) {
-        return node.kind === 205;
+        return node.kind === 205 /* ClassExpression */;
     }
     ts.isClassExpression = isClassExpression;
     function isOmittedExpression(node) {
-        return node.kind === 206;
+        return node.kind === 206 /* OmittedExpression */;
     }
     ts.isOmittedExpression = isOmittedExpression;
     function isExpressionWithTypeArguments(node) {
-        return node.kind === 207;
+        return node.kind === 207 /* ExpressionWithTypeArguments */;
     }
     ts.isExpressionWithTypeArguments = isExpressionWithTypeArguments;
     function isAsExpression(node) {
-        return node.kind === 208;
+        return node.kind === 208 /* AsExpression */;
     }
     ts.isAsExpression = isAsExpression;
     function isNonNullExpression(node) {
-        return node.kind === 209;
+        return node.kind === 209 /* NonNullExpression */;
     }
     ts.isNonNullExpression = isNonNullExpression;
     function isMetaProperty(node) {
-        return node.kind === 210;
+        return node.kind === 210 /* MetaProperty */;
     }
     ts.isMetaProperty = isMetaProperty;
+    // Misc
     function isTemplateSpan(node) {
-        return node.kind === 211;
+        return node.kind === 211 /* TemplateSpan */;
     }
     ts.isTemplateSpan = isTemplateSpan;
     function isSemicolonClassElement(node) {
-        return node.kind === 212;
+        return node.kind === 212 /* SemicolonClassElement */;
     }
     ts.isSemicolonClassElement = isSemicolonClassElement;
+    // Block
     function isBlock(node) {
-        return node.kind === 213;
+        return node.kind === 213 /* Block */;
     }
     ts.isBlock = isBlock;
     function isVariableStatement(node) {
-        return node.kind === 214;
+        return node.kind === 214 /* VariableStatement */;
     }
     ts.isVariableStatement = isVariableStatement;
     function isEmptyStatement(node) {
-        return node.kind === 215;
+        return node.kind === 215 /* EmptyStatement */;
     }
     ts.isEmptyStatement = isEmptyStatement;
     function isExpressionStatement(node) {
-        return node.kind === 216;
+        return node.kind === 216 /* ExpressionStatement */;
     }
     ts.isExpressionStatement = isExpressionStatement;
     function isIfStatement(node) {
-        return node.kind === 217;
+        return node.kind === 217 /* IfStatement */;
     }
     ts.isIfStatement = isIfStatement;
     function isDoStatement(node) {
-        return node.kind === 218;
+        return node.kind === 218 /* DoStatement */;
     }
     ts.isDoStatement = isDoStatement;
     function isWhileStatement(node) {
-        return node.kind === 219;
+        return node.kind === 219 /* WhileStatement */;
     }
     ts.isWhileStatement = isWhileStatement;
     function isForStatement(node) {
-        return node.kind === 220;
+        return node.kind === 220 /* ForStatement */;
     }
     ts.isForStatement = isForStatement;
     function isForInStatement(node) {
-        return node.kind === 221;
+        return node.kind === 221 /* ForInStatement */;
     }
     ts.isForInStatement = isForInStatement;
     function isForOfStatement(node) {
-        return node.kind === 222;
+        return node.kind === 222 /* ForOfStatement */;
     }
     ts.isForOfStatement = isForOfStatement;
     function isContinueStatement(node) {
-        return node.kind === 223;
+        return node.kind === 223 /* ContinueStatement */;
     }
     ts.isContinueStatement = isContinueStatement;
     function isBreakStatement(node) {
-        return node.kind === 224;
+        return node.kind === 224 /* BreakStatement */;
     }
     ts.isBreakStatement = isBreakStatement;
     function isBreakOrContinueStatement(node) {
-        return node.kind === 224 || node.kind === 223;
+        return node.kind === 224 /* BreakStatement */ || node.kind === 223 /* ContinueStatement */;
     }
     ts.isBreakOrContinueStatement = isBreakOrContinueStatement;
     function isReturnStatement(node) {
-        return node.kind === 225;
+        return node.kind === 225 /* ReturnStatement */;
     }
     ts.isReturnStatement = isReturnStatement;
     function isWithStatement(node) {
-        return node.kind === 226;
+        return node.kind === 226 /* WithStatement */;
     }
     ts.isWithStatement = isWithStatement;
     function isSwitchStatement(node) {
-        return node.kind === 227;
+        return node.kind === 227 /* SwitchStatement */;
     }
     ts.isSwitchStatement = isSwitchStatement;
     function isLabeledStatement(node) {
-        return node.kind === 228;
+        return node.kind === 228 /* LabeledStatement */;
     }
     ts.isLabeledStatement = isLabeledStatement;
     function isThrowStatement(node) {
-        return node.kind === 229;
+        return node.kind === 229 /* ThrowStatement */;
     }
     ts.isThrowStatement = isThrowStatement;
     function isTryStatement(node) {
-        return node.kind === 230;
+        return node.kind === 230 /* TryStatement */;
     }
     ts.isTryStatement = isTryStatement;
     function isDebuggerStatement(node) {
-        return node.kind === 231;
+        return node.kind === 231 /* DebuggerStatement */;
     }
     ts.isDebuggerStatement = isDebuggerStatement;
     function isVariableDeclaration(node) {
-        return node.kind === 232;
+        return node.kind === 232 /* VariableDeclaration */;
     }
     ts.isVariableDeclaration = isVariableDeclaration;
     function isVariableDeclarationList(node) {
-        return node.kind === 233;
+        return node.kind === 233 /* VariableDeclarationList */;
     }
     ts.isVariableDeclarationList = isVariableDeclarationList;
     function isFunctionDeclaration(node) {
-        return node.kind === 234;
+        return node.kind === 234 /* FunctionDeclaration */;
     }
     ts.isFunctionDeclaration = isFunctionDeclaration;
     function isClassDeclaration(node) {
-        return node.kind === 235;
+        return node.kind === 235 /* ClassDeclaration */;
     }
     ts.isClassDeclaration = isClassDeclaration;
     function isInterfaceDeclaration(node) {
-        return node.kind === 236;
+        return node.kind === 236 /* InterfaceDeclaration */;
     }
     ts.isInterfaceDeclaration = isInterfaceDeclaration;
     function isTypeAliasDeclaration(node) {
-        return node.kind === 237;
+        return node.kind === 237 /* TypeAliasDeclaration */;
     }
     ts.isTypeAliasDeclaration = isTypeAliasDeclaration;
     function isEnumDeclaration(node) {
-        return node.kind === 238;
+        return node.kind === 238 /* EnumDeclaration */;
     }
     ts.isEnumDeclaration = isEnumDeclaration;
     function isModuleDeclaration(node) {
-        return node.kind === 239;
+        return node.kind === 239 /* ModuleDeclaration */;
     }
     ts.isModuleDeclaration = isModuleDeclaration;
     function isModuleBlock(node) {
-        return node.kind === 240;
+        return node.kind === 240 /* ModuleBlock */;
     }
     ts.isModuleBlock = isModuleBlock;
     function isCaseBlock(node) {
-        return node.kind === 241;
+        return node.kind === 241 /* CaseBlock */;
     }
     ts.isCaseBlock = isCaseBlock;
     function isNamespaceExportDeclaration(node) {
-        return node.kind === 242;
+        return node.kind === 242 /* NamespaceExportDeclaration */;
     }
     ts.isNamespaceExportDeclaration = isNamespaceExportDeclaration;
     function isImportEqualsDeclaration(node) {
-        return node.kind === 243;
+        return node.kind === 243 /* ImportEqualsDeclaration */;
     }
     ts.isImportEqualsDeclaration = isImportEqualsDeclaration;
     function isImportDeclaration(node) {
-        return node.kind === 244;
+        return node.kind === 244 /* ImportDeclaration */;
     }
     ts.isImportDeclaration = isImportDeclaration;
     function isImportClause(node) {
-        return node.kind === 245;
+        return node.kind === 245 /* ImportClause */;
     }
     ts.isImportClause = isImportClause;
     function isNamespaceImport(node) {
-        return node.kind === 246;
+        return node.kind === 246 /* NamespaceImport */;
     }
     ts.isNamespaceImport = isNamespaceImport;
     function isNamedImports(node) {
-        return node.kind === 247;
+        return node.kind === 247 /* NamedImports */;
     }
     ts.isNamedImports = isNamedImports;
     function isImportSpecifier(node) {
-        return node.kind === 248;
+        return node.kind === 248 /* ImportSpecifier */;
     }
     ts.isImportSpecifier = isImportSpecifier;
     function isExportAssignment(node) {
-        return node.kind === 249;
+        return node.kind === 249 /* ExportAssignment */;
     }
     ts.isExportAssignment = isExportAssignment;
     function isExportDeclaration(node) {
-        return node.kind === 250;
+        return node.kind === 250 /* ExportDeclaration */;
     }
     ts.isExportDeclaration = isExportDeclaration;
     function isNamedExports(node) {
-        return node.kind === 251;
+        return node.kind === 251 /* NamedExports */;
     }
     ts.isNamedExports = isNamedExports;
     function isExportSpecifier(node) {
-        return node.kind === 252;
+        return node.kind === 252 /* ExportSpecifier */;
     }
     ts.isExportSpecifier = isExportSpecifier;
     function isMissingDeclaration(node) {
-        return node.kind === 253;
+        return node.kind === 253 /* MissingDeclaration */;
     }
     ts.isMissingDeclaration = isMissingDeclaration;
+    // Module References
     function isExternalModuleReference(node) {
-        return node.kind === 254;
+        return node.kind === 254 /* ExternalModuleReference */;
     }
     ts.isExternalModuleReference = isExternalModuleReference;
+    // JSX
     function isJsxElement(node) {
-        return node.kind === 255;
+        return node.kind === 255 /* JsxElement */;
     }
     ts.isJsxElement = isJsxElement;
     function isJsxSelfClosingElement(node) {
-        return node.kind === 256;
+        return node.kind === 256 /* JsxSelfClosingElement */;
     }
     ts.isJsxSelfClosingElement = isJsxSelfClosingElement;
     function isJsxOpeningElement(node) {
-        return node.kind === 257;
+        return node.kind === 257 /* JsxOpeningElement */;
     }
     ts.isJsxOpeningElement = isJsxOpeningElement;
     function isJsxClosingElement(node) {
-        return node.kind === 258;
+        return node.kind === 258 /* JsxClosingElement */;
     }
     ts.isJsxClosingElement = isJsxClosingElement;
     function isJsxFragment(node) {
-        return node.kind === 259;
+        return node.kind === 259 /* JsxFragment */;
     }
     ts.isJsxFragment = isJsxFragment;
     function isJsxOpeningFragment(node) {
-        return node.kind === 260;
+        return node.kind === 260 /* JsxOpeningFragment */;
     }
     ts.isJsxOpeningFragment = isJsxOpeningFragment;
     function isJsxClosingFragment(node) {
-        return node.kind === 261;
+        return node.kind === 261 /* JsxClosingFragment */;
     }
     ts.isJsxClosingFragment = isJsxClosingFragment;
     function isJsxAttribute(node) {
-        return node.kind === 262;
+        return node.kind === 262 /* JsxAttribute */;
     }
     ts.isJsxAttribute = isJsxAttribute;
     function isJsxAttributes(node) {
-        return node.kind === 263;
+        return node.kind === 263 /* JsxAttributes */;
     }
     ts.isJsxAttributes = isJsxAttributes;
     function isJsxSpreadAttribute(node) {
-        return node.kind === 264;
+        return node.kind === 264 /* JsxSpreadAttribute */;
     }
     ts.isJsxSpreadAttribute = isJsxSpreadAttribute;
     function isJsxExpression(node) {
-        return node.kind === 265;
+        return node.kind === 265 /* JsxExpression */;
     }
     ts.isJsxExpression = isJsxExpression;
+    // Clauses
     function isCaseClause(node) {
-        return node.kind === 266;
+        return node.kind === 266 /* CaseClause */;
     }
     ts.isCaseClause = isCaseClause;
     function isDefaultClause(node) {
-        return node.kind === 267;
+        return node.kind === 267 /* DefaultClause */;
     }
     ts.isDefaultClause = isDefaultClause;
     function isHeritageClause(node) {
-        return node.kind === 268;
+        return node.kind === 268 /* HeritageClause */;
     }
     ts.isHeritageClause = isHeritageClause;
     function isCatchClause(node) {
-        return node.kind === 269;
+        return node.kind === 269 /* CatchClause */;
     }
     ts.isCatchClause = isCatchClause;
+    // Property assignments
     function isPropertyAssignment(node) {
-        return node.kind === 270;
+        return node.kind === 270 /* PropertyAssignment */;
     }
     ts.isPropertyAssignment = isPropertyAssignment;
     function isShorthandPropertyAssignment(node) {
-        return node.kind === 271;
+        return node.kind === 271 /* ShorthandPropertyAssignment */;
     }
     ts.isShorthandPropertyAssignment = isShorthandPropertyAssignment;
     function isSpreadAssignment(node) {
-        return node.kind === 272;
+        return node.kind === 272 /* SpreadAssignment */;
     }
     ts.isSpreadAssignment = isSpreadAssignment;
+    // Enum
     function isEnumMember(node) {
-        return node.kind === 273;
+        return node.kind === 273 /* EnumMember */;
     }
     ts.isEnumMember = isEnumMember;
+    // Top-level nodes
     function isSourceFile(node) {
-        return node.kind === 274;
+        return node.kind === 274 /* SourceFile */;
     }
     ts.isSourceFile = isSourceFile;
     function isBundle(node) {
-        return node.kind === 275;
+        return node.kind === 275 /* Bundle */;
     }
     ts.isBundle = isBundle;
+    function isUnparsedSource(node) {
+        return node.kind === 276 /* UnparsedSource */;
+    }
+    ts.isUnparsedSource = isUnparsedSource;
+    // JSDoc
     function isJSDocTypeExpression(node) {
-        return node.kind === 278;
+        return node.kind === 278 /* JSDocTypeExpression */;
     }
     ts.isJSDocTypeExpression = isJSDocTypeExpression;
     function isJSDocAllType(node) {
-        return node.kind === 279;
+        return node.kind === 279 /* JSDocAllType */;
     }
     ts.isJSDocAllType = isJSDocAllType;
     function isJSDocUnknownType(node) {
-        return node.kind === 280;
+        return node.kind === 280 /* JSDocUnknownType */;
     }
     ts.isJSDocUnknownType = isJSDocUnknownType;
     function isJSDocNullableType(node) {
-        return node.kind === 281;
+        return node.kind === 281 /* JSDocNullableType */;
     }
     ts.isJSDocNullableType = isJSDocNullableType;
     function isJSDocNonNullableType(node) {
-        return node.kind === 282;
+        return node.kind === 282 /* JSDocNonNullableType */;
     }
     ts.isJSDocNonNullableType = isJSDocNonNullableType;
     function isJSDocOptionalType(node) {
-        return node.kind === 283;
+        return node.kind === 283 /* JSDocOptionalType */;
     }
     ts.isJSDocOptionalType = isJSDocOptionalType;
     function isJSDocFunctionType(node) {
-        return node.kind === 284;
+        return node.kind === 284 /* JSDocFunctionType */;
     }
     ts.isJSDocFunctionType = isJSDocFunctionType;
     function isJSDocVariadicType(node) {
-        return node.kind === 285;
+        return node.kind === 285 /* JSDocVariadicType */;
     }
     ts.isJSDocVariadicType = isJSDocVariadicType;
     function isJSDoc(node) {
-        return node.kind === 286;
+        return node.kind === 286 /* JSDocComment */;
     }
     ts.isJSDoc = isJSDoc;
     function isJSDocAugmentsTag(node) {
-        return node.kind === 290;
+        return node.kind === 290 /* JSDocAugmentsTag */;
     }
     ts.isJSDocAugmentsTag = isJSDocAugmentsTag;
     function isJSDocClassTag(node) {
-        return node.kind === 291;
+        return node.kind === 291 /* JSDocClassTag */;
     }
     ts.isJSDocClassTag = isJSDocClassTag;
     function isJSDocParameterTag(node) {
-        return node.kind === 293;
+        return node.kind === 293 /* JSDocParameterTag */;
     }
     ts.isJSDocParameterTag = isJSDocParameterTag;
     function isJSDocReturnTag(node) {
-        return node.kind === 294;
+        return node.kind === 294 /* JSDocReturnTag */;
     }
     ts.isJSDocReturnTag = isJSDocReturnTag;
     function isJSDocTypeTag(node) {
-        return node.kind === 295;
+        return node.kind === 295 /* JSDocTypeTag */;
     }
     ts.isJSDocTypeTag = isJSDocTypeTag;
     function isJSDocTemplateTag(node) {
-        return node.kind === 296;
+        return node.kind === 296 /* JSDocTemplateTag */;
     }
     ts.isJSDocTemplateTag = isJSDocTemplateTag;
     function isJSDocTypedefTag(node) {
-        return node.kind === 297;
+        return node.kind === 297 /* JSDocTypedefTag */;
     }
     ts.isJSDocTypedefTag = isJSDocTypedefTag;
     function isJSDocPropertyTag(node) {
-        return node.kind === 298;
+        return node.kind === 298 /* JSDocPropertyTag */;
     }
     ts.isJSDocPropertyTag = isJSDocPropertyTag;
     function isJSDocPropertyLikeTag(node) {
-        return node.kind === 298 || node.kind === 293;
+        return node.kind === 298 /* JSDocPropertyTag */ || node.kind === 293 /* JSDocParameterTag */;
     }
     ts.isJSDocPropertyLikeTag = isJSDocPropertyLikeTag;
     function isJSDocTypeLiteral(node) {
-        return node.kind === 287;
+        return node.kind === 287 /* JSDocTypeLiteral */;
     }
     ts.isJSDocTypeLiteral = isJSDocTypeLiteral;
     function isJSDocCallbackTag(node) {
-        return node.kind === 292;
+        return node.kind === 292 /* JSDocCallbackTag */;
     }
     ts.isJSDocCallbackTag = isJSDocCallbackTag;
     function isJSDocSignature(node) {
-        return node.kind === 288;
+        return node.kind === 288 /* JSDocSignature */;
     }
     ts.isJSDocSignature = isJSDocSignature;
 })(ts || (ts = {}));
+// Node tests
+//
+// All node tests in the following list should *not* reference parent pointers so that
+// they may be used with transformations.
 (function (ts) {
+    /* @internal */
     function isSyntaxList(n) {
-        return n.kind === 299;
+        return n.kind === 299 /* SyntaxList */;
     }
     ts.isSyntaxList = isSyntaxList;
+    /* @internal */
     function isNode(node) {
         return isNodeKind(node.kind);
     }
     ts.isNode = isNode;
+    /* @internal */
     function isNodeKind(kind) {
-        return kind >= 146;
+        return kind >= 146 /* FirstNode */;
     }
     ts.isNodeKind = isNodeKind;
+    /**
+     * True if node is of some token syntax kind.
+     * For example, this is true for an IfKeyword but not for an IfStatement.
+     * Literals are considered tokens, except TemplateLiteral, but does include TemplateHead/Middle/Tail.
+     */
     function isToken(n) {
-        return n.kind >= 0 && n.kind <= 145;
+        return n.kind >= 0 /* FirstToken */ && n.kind <= 145 /* LastToken */;
     }
     ts.isToken = isToken;
+    // Node Arrays
+    /* @internal */
     function isNodeArray(array) {
         return array.hasOwnProperty("pos") && array.hasOwnProperty("end");
     }
     ts.isNodeArray = isNodeArray;
+    // Literals
+    /* @internal */
     function isLiteralKind(kind) {
-        return 8 <= kind && kind <= 13;
+        return 8 /* FirstLiteralToken */ <= kind && kind <= 13 /* LastLiteralToken */;
     }
     ts.isLiteralKind = isLiteralKind;
     function isLiteralExpression(node) {
         return isLiteralKind(node.kind);
     }
     ts.isLiteralExpression = isLiteralExpression;
+    // Pseudo-literals
+    /* @internal */
     function isTemplateLiteralKind(kind) {
-        return 13 <= kind && kind <= 16;
+        return 13 /* FirstTemplateToken */ <= kind && kind <= 16 /* LastTemplateToken */;
     }
     ts.isTemplateLiteralKind = isTemplateLiteralKind;
     function isTemplateLiteralToken(node) {
@@ -11061,42 +12878,48 @@ var ts;
     ts.isTemplateLiteralToken = isTemplateLiteralToken;
     function isTemplateMiddleOrTemplateTail(node) {
         var kind = node.kind;
-        return kind === 15
-            || kind === 16;
+        return kind === 15 /* TemplateMiddle */
+            || kind === 16 /* TemplateTail */;
     }
     ts.isTemplateMiddleOrTemplateTail = isTemplateMiddleOrTemplateTail;
     function isStringTextContainingNode(node) {
-        return node.kind === 9 || isTemplateLiteralKind(node.kind);
+        return node.kind === 9 /* StringLiteral */ || isTemplateLiteralKind(node.kind);
     }
     ts.isStringTextContainingNode = isStringTextContainingNode;
+    // Identifiers
+    /* @internal */
     function isGeneratedIdentifier(node) {
-        return ts.isIdentifier(node) && (node.autoGenerateFlags & 7) > 0;
+        return ts.isIdentifier(node) && (node.autoGenerateFlags & 7 /* KindMask */) > 0 /* None */;
     }
     ts.isGeneratedIdentifier = isGeneratedIdentifier;
+    // Keywords
+    /* @internal */
     function isModifierKind(token) {
         switch (token) {
-            case 117:
-            case 120:
-            case 76:
-            case 124:
-            case 79:
-            case 84:
-            case 114:
-            case 112:
-            case 113:
-            case 132:
-            case 115:
+            case 117 /* AbstractKeyword */:
+            case 120 /* AsyncKeyword */:
+            case 76 /* ConstKeyword */:
+            case 124 /* DeclareKeyword */:
+            case 79 /* DefaultKeyword */:
+            case 84 /* ExportKeyword */:
+            case 114 /* PublicKeyword */:
+            case 112 /* PrivateKeyword */:
+            case 113 /* ProtectedKeyword */:
+            case 132 /* ReadonlyKeyword */:
+            case 115 /* StaticKeyword */:
                 return true;
         }
         return false;
     }
     ts.isModifierKind = isModifierKind;
+    /* @internal */
     function isParameterPropertyModifier(kind) {
-        return !!(ts.modifierToFlag(kind) & 92);
+        return !!(ts.modifierToFlag(kind) & 92 /* ParameterPropertyModifier */);
     }
     ts.isParameterPropertyModifier = isParameterPropertyModifier;
+    /* @internal */
     function isClassMemberModifier(idToken) {
-        return isParameterPropertyModifier(idToken) || idToken === 115;
+        return isParameterPropertyModifier(idToken) || idToken === 115 /* StaticKeyword */;
     }
     ts.isClassMemberModifier = isClassMemberModifier;
     function isModifier(node) {
@@ -11105,104 +12928,111 @@ var ts;
     ts.isModifier = isModifier;
     function isEntityName(node) {
         var kind = node.kind;
-        return kind === 146
-            || kind === 71;
+        return kind === 146 /* QualifiedName */
+            || kind === 71 /* Identifier */;
     }
     ts.isEntityName = isEntityName;
     function isPropertyName(node) {
         var kind = node.kind;
-        return kind === 71
-            || kind === 9
-            || kind === 8
-            || kind === 147;
+        return kind === 71 /* Identifier */
+            || kind === 9 /* StringLiteral */
+            || kind === 8 /* NumericLiteral */
+            || kind === 147 /* ComputedPropertyName */;
     }
     ts.isPropertyName = isPropertyName;
     function isBindingName(node) {
         var kind = node.kind;
-        return kind === 71
-            || kind === 180
-            || kind === 181;
+        return kind === 71 /* Identifier */
+            || kind === 180 /* ObjectBindingPattern */
+            || kind === 181 /* ArrayBindingPattern */;
     }
     ts.isBindingName = isBindingName;
+    // Functions
     function isFunctionLike(node) {
         return node && isFunctionLikeKind(node.kind);
     }
     ts.isFunctionLike = isFunctionLike;
+    /* @internal */
     function isFunctionLikeDeclaration(node) {
         return node && isFunctionLikeDeclarationKind(node.kind);
     }
     ts.isFunctionLikeDeclaration = isFunctionLikeDeclaration;
     function isFunctionLikeDeclarationKind(kind) {
         switch (kind) {
-            case 234:
-            case 154:
-            case 155:
-            case 156:
-            case 157:
-            case 192:
-            case 193:
+            case 234 /* FunctionDeclaration */:
+            case 154 /* MethodDeclaration */:
+            case 155 /* Constructor */:
+            case 156 /* GetAccessor */:
+            case 157 /* SetAccessor */:
+            case 192 /* FunctionExpression */:
+            case 193 /* ArrowFunction */:
                 return true;
             default:
                 return false;
         }
     }
+    /* @internal */
     function isFunctionLikeKind(kind) {
         switch (kind) {
-            case 153:
-            case 158:
-            case 288:
-            case 159:
-            case 160:
-            case 163:
-            case 284:
-            case 164:
+            case 153 /* MethodSignature */:
+            case 158 /* CallSignature */:
+            case 288 /* JSDocSignature */:
+            case 159 /* ConstructSignature */:
+            case 160 /* IndexSignature */:
+            case 163 /* FunctionType */:
+            case 284 /* JSDocFunctionType */:
+            case 164 /* ConstructorType */:
                 return true;
             default:
                 return isFunctionLikeDeclarationKind(kind);
         }
     }
     ts.isFunctionLikeKind = isFunctionLikeKind;
+    /* @internal */
     function isFunctionOrModuleBlock(node) {
         return ts.isSourceFile(node) || ts.isModuleBlock(node) || ts.isBlock(node) && isFunctionLike(node.parent);
     }
     ts.isFunctionOrModuleBlock = isFunctionOrModuleBlock;
+    // Classes
     function isClassElement(node) {
         var kind = node.kind;
-        return kind === 155
-            || kind === 152
-            || kind === 154
-            || kind === 156
-            || kind === 157
-            || kind === 160
-            || kind === 212;
+        return kind === 155 /* Constructor */
+            || kind === 152 /* PropertyDeclaration */
+            || kind === 154 /* MethodDeclaration */
+            || kind === 156 /* GetAccessor */
+            || kind === 157 /* SetAccessor */
+            || kind === 160 /* IndexSignature */
+            || kind === 212 /* SemicolonClassElement */;
     }
     ts.isClassElement = isClassElement;
     function isClassLike(node) {
-        return node && (node.kind === 235 || node.kind === 205);
+        return node && (node.kind === 235 /* ClassDeclaration */ || node.kind === 205 /* ClassExpression */);
     }
     ts.isClassLike = isClassLike;
     function isAccessor(node) {
-        return node && (node.kind === 156 || node.kind === 157);
+        return node && (node.kind === 156 /* GetAccessor */ || node.kind === 157 /* SetAccessor */);
     }
     ts.isAccessor = isAccessor;
+    /* @internal */
     function isMethodOrAccessor(node) {
         switch (node.kind) {
-            case 154:
-            case 156:
-            case 157:
+            case 154 /* MethodDeclaration */:
+            case 156 /* GetAccessor */:
+            case 157 /* SetAccessor */:
                 return true;
             default:
                 return false;
         }
     }
     ts.isMethodOrAccessor = isMethodOrAccessor;
+    // Type members
     function isTypeElement(node) {
         var kind = node.kind;
-        return kind === 159
-            || kind === 158
-            || kind === 151
-            || kind === 153
-            || kind === 160;
+        return kind === 159 /* ConstructSignature */
+            || kind === 158 /* CallSignature */
+            || kind === 151 /* PropertySignature */
+            || kind === 153 /* MethodSignature */
+            || kind === 160 /* IndexSignature */;
     }
     ts.isTypeElement = isTypeElement;
     function isClassOrTypeElement(node) {
@@ -11211,125 +13041,153 @@ var ts;
     ts.isClassOrTypeElement = isClassOrTypeElement;
     function isObjectLiteralElementLike(node) {
         var kind = node.kind;
-        return kind === 270
-            || kind === 271
-            || kind === 272
-            || kind === 154
-            || kind === 156
-            || kind === 157;
+        return kind === 270 /* PropertyAssignment */
+            || kind === 271 /* ShorthandPropertyAssignment */
+            || kind === 272 /* SpreadAssignment */
+            || kind === 154 /* MethodDeclaration */
+            || kind === 156 /* GetAccessor */
+            || kind === 157 /* SetAccessor */;
     }
     ts.isObjectLiteralElementLike = isObjectLiteralElementLike;
+    // Type
     function isTypeNodeKind(kind) {
-        return (kind >= 161 && kind <= 179)
-            || kind === 119
-            || kind === 142
-            || kind === 134
-            || kind === 135
-            || kind === 122
-            || kind === 137
-            || kind === 138
-            || kind === 99
-            || kind === 105
-            || kind === 140
-            || kind === 95
-            || kind === 131
-            || kind === 207
-            || kind === 279
-            || kind === 280
-            || kind === 281
-            || kind === 282
-            || kind === 283
-            || kind === 284
-            || kind === 285;
+        return (kind >= 161 /* FirstTypeNode */ && kind <= 179 /* LastTypeNode */)
+            || kind === 119 /* AnyKeyword */
+            || kind === 142 /* UnknownKeyword */
+            || kind === 134 /* NumberKeyword */
+            || kind === 135 /* ObjectKeyword */
+            || kind === 122 /* BooleanKeyword */
+            || kind === 137 /* StringKeyword */
+            || kind === 138 /* SymbolKeyword */
+            || kind === 99 /* ThisKeyword */
+            || kind === 105 /* VoidKeyword */
+            || kind === 140 /* UndefinedKeyword */
+            || kind === 95 /* NullKeyword */
+            || kind === 131 /* NeverKeyword */
+            || kind === 207 /* ExpressionWithTypeArguments */
+            || kind === 279 /* JSDocAllType */
+            || kind === 280 /* JSDocUnknownType */
+            || kind === 281 /* JSDocNullableType */
+            || kind === 282 /* JSDocNonNullableType */
+            || kind === 283 /* JSDocOptionalType */
+            || kind === 284 /* JSDocFunctionType */
+            || kind === 285 /* JSDocVariadicType */;
     }
+    /**
+     * Node test that determines whether a node is a valid type node.
+     * This differs from the `isPartOfTypeNode` function which determines whether a node is *part*
+     * of a TypeNode.
+     */
     function isTypeNode(node) {
         return isTypeNodeKind(node.kind);
     }
     ts.isTypeNode = isTypeNode;
     function isFunctionOrConstructorTypeNode(node) {
         switch (node.kind) {
-            case 163:
-            case 164:
+            case 163 /* FunctionType */:
+            case 164 /* ConstructorType */:
                 return true;
         }
         return false;
     }
     ts.isFunctionOrConstructorTypeNode = isFunctionOrConstructorTypeNode;
+    // Binding patterns
+    /* @internal */
     function isBindingPattern(node) {
         if (node) {
             var kind = node.kind;
-            return kind === 181
-                || kind === 180;
+            return kind === 181 /* ArrayBindingPattern */
+                || kind === 180 /* ObjectBindingPattern */;
         }
         return false;
     }
     ts.isBindingPattern = isBindingPattern;
+    /* @internal */
     function isAssignmentPattern(node) {
         var kind = node.kind;
-        return kind === 183
-            || kind === 184;
+        return kind === 183 /* ArrayLiteralExpression */
+            || kind === 184 /* ObjectLiteralExpression */;
     }
     ts.isAssignmentPattern = isAssignmentPattern;
+    /* @internal */
     function isArrayBindingElement(node) {
         var kind = node.kind;
-        return kind === 182
-            || kind === 206;
+        return kind === 182 /* BindingElement */
+            || kind === 206 /* OmittedExpression */;
     }
     ts.isArrayBindingElement = isArrayBindingElement;
+    /**
+     * Determines whether the BindingOrAssignmentElement is a BindingElement-like declaration
+     */
+    /* @internal */
     function isDeclarationBindingElement(bindingElement) {
         switch (bindingElement.kind) {
-            case 232:
-            case 149:
-            case 182:
+            case 232 /* VariableDeclaration */:
+            case 149 /* Parameter */:
+            case 182 /* BindingElement */:
                 return true;
         }
         return false;
     }
     ts.isDeclarationBindingElement = isDeclarationBindingElement;
+    /**
+     * Determines whether a node is a BindingOrAssignmentPattern
+     */
+    /* @internal */
     function isBindingOrAssignmentPattern(node) {
         return isObjectBindingOrAssignmentPattern(node)
             || isArrayBindingOrAssignmentPattern(node);
     }
     ts.isBindingOrAssignmentPattern = isBindingOrAssignmentPattern;
+    /**
+     * Determines whether a node is an ObjectBindingOrAssignmentPattern
+     */
+    /* @internal */
     function isObjectBindingOrAssignmentPattern(node) {
         switch (node.kind) {
-            case 180:
-            case 184:
+            case 180 /* ObjectBindingPattern */:
+            case 184 /* ObjectLiteralExpression */:
                 return true;
         }
         return false;
     }
     ts.isObjectBindingOrAssignmentPattern = isObjectBindingOrAssignmentPattern;
+    /**
+     * Determines whether a node is an ArrayBindingOrAssignmentPattern
+     */
+    /* @internal */
     function isArrayBindingOrAssignmentPattern(node) {
         switch (node.kind) {
-            case 181:
-            case 183:
+            case 181 /* ArrayBindingPattern */:
+            case 183 /* ArrayLiteralExpression */:
                 return true;
         }
         return false;
     }
     ts.isArrayBindingOrAssignmentPattern = isArrayBindingOrAssignmentPattern;
+    /* @internal */
     function isPropertyAccessOrQualifiedNameOrImportTypeNode(node) {
         var kind = node.kind;
-        return kind === 185
-            || kind === 146
-            || kind === 179;
+        return kind === 185 /* PropertyAccessExpression */
+            || kind === 146 /* QualifiedName */
+            || kind === 179 /* ImportType */;
     }
     ts.isPropertyAccessOrQualifiedNameOrImportTypeNode = isPropertyAccessOrQualifiedNameOrImportTypeNode;
+    // Expression
     function isPropertyAccessOrQualifiedName(node) {
         var kind = node.kind;
-        return kind === 185
-            || kind === 146;
+        return kind === 185 /* PropertyAccessExpression */
+            || kind === 146 /* QualifiedName */;
     }
     ts.isPropertyAccessOrQualifiedName = isPropertyAccessOrQualifiedName;
     function isCallLikeExpression(node) {
         switch (node.kind) {
-            case 257:
-            case 256:
-            case 187:
-            case 188:
-            case 189:
-            case 150:
+            case 257 /* JsxOpeningElement */:
+            case 256 /* JsxSelfClosingElement */:
+            case 187 /* CallExpression */:
+            case 188 /* NewExpression */:
+            case 189 /* TaggedTemplateExpression */:
+            case 150 /* Decorator */:
                 return true;
             default:
                 return false;
@@ -11337,98 +13195,106 @@ var ts;
     }
     ts.isCallLikeExpression = isCallLikeExpression;
     function isCallOrNewExpression(node) {
-        return node.kind === 187 || node.kind === 188;
+        return node.kind === 187 /* CallExpression */ || node.kind === 188 /* NewExpression */;
     }
     ts.isCallOrNewExpression = isCallOrNewExpression;
     function isTemplateLiteral(node) {
         var kind = node.kind;
-        return kind === 202
-            || kind === 13;
+        return kind === 202 /* TemplateExpression */
+            || kind === 13 /* NoSubstitutionTemplateLiteral */;
     }
     ts.isTemplateLiteral = isTemplateLiteral;
+    /* @internal */
     function isLeftHandSideExpression(node) {
         return isLeftHandSideExpressionKind(ts.skipPartiallyEmittedExpressions(node).kind);
     }
     ts.isLeftHandSideExpression = isLeftHandSideExpression;
     function isLeftHandSideExpressionKind(kind) {
         switch (kind) {
-            case 185:
-            case 186:
-            case 188:
-            case 187:
-            case 255:
-            case 256:
-            case 259:
-            case 189:
-            case 183:
-            case 191:
-            case 184:
-            case 205:
-            case 192:
-            case 71:
-            case 12:
-            case 8:
-            case 9:
-            case 13:
-            case 202:
-            case 86:
-            case 95:
-            case 99:
-            case 101:
-            case 97:
-            case 209:
-            case 210:
-            case 91:
+            case 185 /* PropertyAccessExpression */:
+            case 186 /* ElementAccessExpression */:
+            case 188 /* NewExpression */:
+            case 187 /* CallExpression */:
+            case 255 /* JsxElement */:
+            case 256 /* JsxSelfClosingElement */:
+            case 259 /* JsxFragment */:
+            case 189 /* TaggedTemplateExpression */:
+            case 183 /* ArrayLiteralExpression */:
+            case 191 /* ParenthesizedExpression */:
+            case 184 /* ObjectLiteralExpression */:
+            case 205 /* ClassExpression */:
+            case 192 /* FunctionExpression */:
+            case 71 /* Identifier */:
+            case 12 /* RegularExpressionLiteral */:
+            case 8 /* NumericLiteral */:
+            case 9 /* StringLiteral */:
+            case 13 /* NoSubstitutionTemplateLiteral */:
+            case 202 /* TemplateExpression */:
+            case 86 /* FalseKeyword */:
+            case 95 /* NullKeyword */:
+            case 99 /* ThisKeyword */:
+            case 101 /* TrueKeyword */:
+            case 97 /* SuperKeyword */:
+            case 209 /* NonNullExpression */:
+            case 210 /* MetaProperty */:
+            case 91 /* ImportKeyword */: // technically this is only an Expression if it's in a CallExpression
                 return true;
             default:
                 return false;
         }
     }
+    /* @internal */
     function isUnaryExpression(node) {
         return isUnaryExpressionKind(ts.skipPartiallyEmittedExpressions(node).kind);
     }
     ts.isUnaryExpression = isUnaryExpression;
     function isUnaryExpressionKind(kind) {
         switch (kind) {
-            case 198:
-            case 199:
-            case 194:
-            case 195:
-            case 196:
-            case 197:
-            case 190:
+            case 198 /* PrefixUnaryExpression */:
+            case 199 /* PostfixUnaryExpression */:
+            case 194 /* DeleteExpression */:
+            case 195 /* TypeOfExpression */:
+            case 196 /* VoidExpression */:
+            case 197 /* AwaitExpression */:
+            case 190 /* TypeAssertionExpression */:
                 return true;
             default:
                 return isLeftHandSideExpressionKind(kind);
         }
     }
+    /* @internal */
     function isUnaryExpressionWithWrite(expr) {
         switch (expr.kind) {
-            case 199:
+            case 199 /* PostfixUnaryExpression */:
                 return true;
-            case 198:
-                return expr.operator === 43 ||
-                    expr.operator === 44;
+            case 198 /* PrefixUnaryExpression */:
+                return expr.operator === 43 /* PlusPlusToken */ ||
+                    expr.operator === 44 /* MinusMinusToken */;
             default:
                 return false;
         }
     }
     ts.isUnaryExpressionWithWrite = isUnaryExpressionWithWrite;
+    /* @internal */
+    /**
+     * Determines whether a node is an expression based only on its kind.
+     * Use `isExpressionNode` if not in transforms.
+     */
     function isExpression(node) {
         return isExpressionKind(ts.skipPartiallyEmittedExpressions(node).kind);
     }
     ts.isExpression = isExpression;
     function isExpressionKind(kind) {
         switch (kind) {
-            case 201:
-            case 203:
-            case 193:
-            case 200:
-            case 204:
-            case 208:
-            case 206:
-            case 302:
-            case 301:
+            case 201 /* ConditionalExpression */:
+            case 203 /* YieldExpression */:
+            case 193 /* ArrowFunction */:
+            case 200 /* BinaryExpression */:
+            case 204 /* SpreadElement */:
+            case 208 /* AsExpression */:
+            case 206 /* OmittedExpression */:
+            case 302 /* CommaListExpression */:
+            case 301 /* PartiallyEmittedExpression */:
                 return true;
             default:
                 return isUnaryExpressionKind(kind);
@@ -11436,18 +13302,21 @@ var ts;
     }
     function isAssertionExpression(node) {
         var kind = node.kind;
-        return kind === 190
-            || kind === 208;
+        return kind === 190 /* TypeAssertionExpression */
+            || kind === 208 /* AsExpression */;
     }
     ts.isAssertionExpression = isAssertionExpression;
+    /* @internal */
     function isPartiallyEmittedExpression(node) {
-        return node.kind === 301;
+        return node.kind === 301 /* PartiallyEmittedExpression */;
     }
     ts.isPartiallyEmittedExpression = isPartiallyEmittedExpression;
+    /* @internal */
     function isNotEmittedStatement(node) {
-        return node.kind === 300;
+        return node.kind === 300 /* NotEmittedStatement */;
     }
     ts.isNotEmittedStatement = isNotEmittedStatement;
+    /* @internal */
     function isNotEmittedOrPartiallyEmittedNode(node) {
         return isNotEmittedStatement(node)
             || isPartiallyEmittedExpression(node);
@@ -11455,152 +13324,169 @@ var ts;
     ts.isNotEmittedOrPartiallyEmittedNode = isNotEmittedOrPartiallyEmittedNode;
     function isIterationStatement(node, lookInLabeledStatements) {
         switch (node.kind) {
-            case 220:
-            case 221:
-            case 222:
-            case 218:
-            case 219:
+            case 220 /* ForStatement */:
+            case 221 /* ForInStatement */:
+            case 222 /* ForOfStatement */:
+            case 218 /* DoStatement */:
+            case 219 /* WhileStatement */:
                 return true;
-            case 228:
+            case 228 /* LabeledStatement */:
                 return lookInLabeledStatements && isIterationStatement(node.statement, lookInLabeledStatements);
         }
         return false;
     }
     ts.isIterationStatement = isIterationStatement;
+    /* @internal */
     function isForInOrOfStatement(node) {
-        return node.kind === 221 || node.kind === 222;
+        return node.kind === 221 /* ForInStatement */ || node.kind === 222 /* ForOfStatement */;
     }
     ts.isForInOrOfStatement = isForInOrOfStatement;
+    // Element
+    /* @internal */
     function isConciseBody(node) {
         return ts.isBlock(node)
             || isExpression(node);
     }
     ts.isConciseBody = isConciseBody;
+    /* @internal */
     function isFunctionBody(node) {
         return ts.isBlock(node);
     }
     ts.isFunctionBody = isFunctionBody;
+    /* @internal */
     function isForInitializer(node) {
         return ts.isVariableDeclarationList(node)
             || isExpression(node);
     }
     ts.isForInitializer = isForInitializer;
+    /* @internal */
     function isModuleBody(node) {
         var kind = node.kind;
-        return kind === 240
-            || kind === 239
-            || kind === 71;
+        return kind === 240 /* ModuleBlock */
+            || kind === 239 /* ModuleDeclaration */
+            || kind === 71 /* Identifier */;
     }
     ts.isModuleBody = isModuleBody;
+    /* @internal */
     function isNamespaceBody(node) {
         var kind = node.kind;
-        return kind === 240
-            || kind === 239;
+        return kind === 240 /* ModuleBlock */
+            || kind === 239 /* ModuleDeclaration */;
     }
     ts.isNamespaceBody = isNamespaceBody;
+    /* @internal */
     function isJSDocNamespaceBody(node) {
         var kind = node.kind;
-        return kind === 71
-            || kind === 239;
+        return kind === 71 /* Identifier */
+            || kind === 239 /* ModuleDeclaration */;
     }
     ts.isJSDocNamespaceBody = isJSDocNamespaceBody;
+    /* @internal */
     function isNamedImportBindings(node) {
         var kind = node.kind;
-        return kind === 247
-            || kind === 246;
+        return kind === 247 /* NamedImports */
+            || kind === 246 /* NamespaceImport */;
     }
     ts.isNamedImportBindings = isNamedImportBindings;
+    /* @internal */
     function isModuleOrEnumDeclaration(node) {
-        return node.kind === 239 || node.kind === 238;
+        return node.kind === 239 /* ModuleDeclaration */ || node.kind === 238 /* EnumDeclaration */;
     }
     ts.isModuleOrEnumDeclaration = isModuleOrEnumDeclaration;
     function isDeclarationKind(kind) {
-        return kind === 193
-            || kind === 182
-            || kind === 235
-            || kind === 205
-            || kind === 155
-            || kind === 238
-            || kind === 273
-            || kind === 252
-            || kind === 234
-            || kind === 192
-            || kind === 156
-            || kind === 245
-            || kind === 243
-            || kind === 248
-            || kind === 236
-            || kind === 262
-            || kind === 154
-            || kind === 153
-            || kind === 239
-            || kind === 242
-            || kind === 246
-            || kind === 149
-            || kind === 270
-            || kind === 152
-            || kind === 151
-            || kind === 157
-            || kind === 271
-            || kind === 237
-            || kind === 148
-            || kind === 232
-            || kind === 297
-            || kind === 292
-            || kind === 298;
+        return kind === 193 /* ArrowFunction */
+            || kind === 182 /* BindingElement */
+            || kind === 235 /* ClassDeclaration */
+            || kind === 205 /* ClassExpression */
+            || kind === 155 /* Constructor */
+            || kind === 238 /* EnumDeclaration */
+            || kind === 273 /* EnumMember */
+            || kind === 252 /* ExportSpecifier */
+            || kind === 234 /* FunctionDeclaration */
+            || kind === 192 /* FunctionExpression */
+            || kind === 156 /* GetAccessor */
+            || kind === 245 /* ImportClause */
+            || kind === 243 /* ImportEqualsDeclaration */
+            || kind === 248 /* ImportSpecifier */
+            || kind === 236 /* InterfaceDeclaration */
+            || kind === 262 /* JsxAttribute */
+            || kind === 154 /* MethodDeclaration */
+            || kind === 153 /* MethodSignature */
+            || kind === 239 /* ModuleDeclaration */
+            || kind === 242 /* NamespaceExportDeclaration */
+            || kind === 246 /* NamespaceImport */
+            || kind === 149 /* Parameter */
+            || kind === 270 /* PropertyAssignment */
+            || kind === 152 /* PropertyDeclaration */
+            || kind === 151 /* PropertySignature */
+            || kind === 157 /* SetAccessor */
+            || kind === 271 /* ShorthandPropertyAssignment */
+            || kind === 237 /* TypeAliasDeclaration */
+            || kind === 148 /* TypeParameter */
+            || kind === 232 /* VariableDeclaration */
+            || kind === 297 /* JSDocTypedefTag */
+            || kind === 292 /* JSDocCallbackTag */
+            || kind === 298 /* JSDocPropertyTag */;
     }
     function isDeclarationStatementKind(kind) {
-        return kind === 234
-            || kind === 253
-            || kind === 235
-            || kind === 236
-            || kind === 237
-            || kind === 238
-            || kind === 239
-            || kind === 244
-            || kind === 243
-            || kind === 250
-            || kind === 249
-            || kind === 242;
+        return kind === 234 /* FunctionDeclaration */
+            || kind === 253 /* MissingDeclaration */
+            || kind === 235 /* ClassDeclaration */
+            || kind === 236 /* InterfaceDeclaration */
+            || kind === 237 /* TypeAliasDeclaration */
+            || kind === 238 /* EnumDeclaration */
+            || kind === 239 /* ModuleDeclaration */
+            || kind === 244 /* ImportDeclaration */
+            || kind === 243 /* ImportEqualsDeclaration */
+            || kind === 250 /* ExportDeclaration */
+            || kind === 249 /* ExportAssignment */
+            || kind === 242 /* NamespaceExportDeclaration */;
     }
     function isStatementKindButNotDeclarationKind(kind) {
-        return kind === 224
-            || kind === 223
-            || kind === 231
-            || kind === 218
-            || kind === 216
-            || kind === 215
-            || kind === 221
-            || kind === 222
-            || kind === 220
-            || kind === 217
-            || kind === 228
-            || kind === 225
-            || kind === 227
-            || kind === 229
-            || kind === 230
-            || kind === 214
-            || kind === 219
-            || kind === 226
-            || kind === 300
-            || kind === 304
-            || kind === 303;
+        return kind === 224 /* BreakStatement */
+            || kind === 223 /* ContinueStatement */
+            || kind === 231 /* DebuggerStatement */
+            || kind === 218 /* DoStatement */
+            || kind === 216 /* ExpressionStatement */
+            || kind === 215 /* EmptyStatement */
+            || kind === 221 /* ForInStatement */
+            || kind === 222 /* ForOfStatement */
+            || kind === 220 /* ForStatement */
+            || kind === 217 /* IfStatement */
+            || kind === 228 /* LabeledStatement */
+            || kind === 225 /* ReturnStatement */
+            || kind === 227 /* SwitchStatement */
+            || kind === 229 /* ThrowStatement */
+            || kind === 230 /* TryStatement */
+            || kind === 214 /* VariableStatement */
+            || kind === 219 /* WhileStatement */
+            || kind === 226 /* WithStatement */
+            || kind === 300 /* NotEmittedStatement */
+            || kind === 304 /* EndOfDeclarationMarker */
+            || kind === 303 /* MergeDeclarationMarker */;
     }
+    /* @internal */
     function isDeclaration(node) {
-        if (node.kind === 148) {
-            return node.parent.kind !== 296 || ts.isInJavaScriptFile(node);
+        if (node.kind === 148 /* TypeParameter */) {
+            return node.parent.kind !== 296 /* JSDocTemplateTag */ || ts.isInJavaScriptFile(node);
         }
         return isDeclarationKind(node.kind);
     }
     ts.isDeclaration = isDeclaration;
+    /* @internal */
     function isDeclarationStatement(node) {
         return isDeclarationStatementKind(node.kind);
     }
     ts.isDeclarationStatement = isDeclarationStatement;
+    /**
+     * Determines whether the node is a statement that is not also a declaration
+     */
+    /* @internal */
     function isStatementButNotDeclaration(node) {
         return isStatementKindButNotDeclarationKind(node.kind);
     }
     ts.isStatementButNotDeclaration = isStatementButNotDeclaration;
+    /* @internal */
     function isStatement(node) {
         var kind = node.kind;
         return isStatementKindButNotDeclarationKind(kind)
@@ -11609,156 +13495,183 @@ var ts;
     }
     ts.isStatement = isStatement;
     function isBlockStatement(node) {
-        if (node.kind !== 213)
+        if (node.kind !== 213 /* Block */)
             return false;
         if (node.parent !== undefined) {
-            if (node.parent.kind === 230 || node.parent.kind === 269) {
+            if (node.parent.kind === 230 /* TryStatement */ || node.parent.kind === 269 /* CatchClause */) {
                 return false;
             }
         }
         return !ts.isFunctionBlock(node);
     }
+    // Module references
+    /* @internal */
     function isModuleReference(node) {
         var kind = node.kind;
-        return kind === 254
-            || kind === 146
-            || kind === 71;
+        return kind === 254 /* ExternalModuleReference */
+            || kind === 146 /* QualifiedName */
+            || kind === 71 /* Identifier */;
     }
     ts.isModuleReference = isModuleReference;
+    // JSX
+    /* @internal */
     function isJsxTagNameExpression(node) {
         var kind = node.kind;
-        return kind === 99
-            || kind === 71
-            || kind === 185;
+        return kind === 99 /* ThisKeyword */
+            || kind === 71 /* Identifier */
+            || kind === 185 /* PropertyAccessExpression */;
     }
     ts.isJsxTagNameExpression = isJsxTagNameExpression;
+    /* @internal */
     function isJsxChild(node) {
         var kind = node.kind;
-        return kind === 255
-            || kind === 265
-            || kind === 256
-            || kind === 10
-            || kind === 259;
+        return kind === 255 /* JsxElement */
+            || kind === 265 /* JsxExpression */
+            || kind === 256 /* JsxSelfClosingElement */
+            || kind === 10 /* JsxText */
+            || kind === 259 /* JsxFragment */;
     }
     ts.isJsxChild = isJsxChild;
+    /* @internal */
     function isJsxAttributeLike(node) {
         var kind = node.kind;
-        return kind === 262
-            || kind === 264;
+        return kind === 262 /* JsxAttribute */
+            || kind === 264 /* JsxSpreadAttribute */;
     }
     ts.isJsxAttributeLike = isJsxAttributeLike;
+    /* @internal */
     function isStringLiteralOrJsxExpression(node) {
         var kind = node.kind;
-        return kind === 9
-            || kind === 265;
+        return kind === 9 /* StringLiteral */
+            || kind === 265 /* JsxExpression */;
     }
     ts.isStringLiteralOrJsxExpression = isStringLiteralOrJsxExpression;
     function isJsxOpeningLikeElement(node) {
         var kind = node.kind;
-        return kind === 257
-            || kind === 256;
+        return kind === 257 /* JsxOpeningElement */
+            || kind === 256 /* JsxSelfClosingElement */;
     }
     ts.isJsxOpeningLikeElement = isJsxOpeningLikeElement;
+    // Clauses
     function isCaseOrDefaultClause(node) {
         var kind = node.kind;
-        return kind === 266
-            || kind === 267;
+        return kind === 266 /* CaseClause */
+            || kind === 267 /* DefaultClause */;
     }
     ts.isCaseOrDefaultClause = isCaseOrDefaultClause;
+    // JSDoc
+    /** True if node is of some JSDoc syntax kind. */
+    /* @internal */
     function isJSDocNode(node) {
-        return node.kind >= 278 && node.kind <= 298;
+        return node.kind >= 278 /* FirstJSDocNode */ && node.kind <= 298 /* LastJSDocNode */;
     }
     ts.isJSDocNode = isJSDocNode;
+    /** True if node is of a kind that may contain comment text. */
     function isJSDocCommentContainingNode(node) {
-        return node.kind === 286 || isJSDocTag(node) || ts.isJSDocTypeLiteral(node) || ts.isJSDocSignature(node);
+        return node.kind === 286 /* JSDocComment */ || isJSDocTag(node) || ts.isJSDocTypeLiteral(node) || ts.isJSDocSignature(node);
     }
     ts.isJSDocCommentContainingNode = isJSDocCommentContainingNode;
+    // TODO: determine what this does before making it public.
+    /* @internal */
     function isJSDocTag(node) {
-        return node.kind >= 289 && node.kind <= 298;
+        return node.kind >= 289 /* FirstJSDocTagNode */ && node.kind <= 298 /* LastJSDocTagNode */;
     }
     ts.isJSDocTag = isJSDocTag;
     function isSetAccessor(node) {
-        return node.kind === 157;
+        return node.kind === 157 /* SetAccessor */;
     }
     ts.isSetAccessor = isSetAccessor;
     function isGetAccessor(node) {
-        return node.kind === 156;
+        return node.kind === 156 /* GetAccessor */;
     }
     ts.isGetAccessor = isGetAccessor;
+    /** True if has jsdoc nodes attached to it. */
+    /* @internal */
+    // TODO: GH#19856 Would like to return `node is Node & { jsDoc: JSDoc[] }` but it causes long compile times
     function hasJSDocNodes(node) {
         var jsDoc = node.jsDoc;
         return !!jsDoc && jsDoc.length > 0;
     }
     ts.hasJSDocNodes = hasJSDocNodes;
+    /** True if has type node attached to it. */
+    /* @internal */
     function hasType(node) {
         return !!node.type;
     }
     ts.hasType = hasType;
+    /* True if the node could have a type node a `.type` */
+    /* @internal */
     function couldHaveType(node) {
         switch (node.kind) {
-            case 149:
-            case 151:
-            case 152:
-            case 153:
-            case 154:
-            case 155:
-            case 156:
-            case 157:
-            case 158:
-            case 159:
-            case 160:
-            case 161:
-            case 163:
-            case 164:
-            case 173:
-            case 175:
-            case 177:
-            case 190:
-            case 192:
-            case 193:
-            case 208:
-            case 232:
-            case 234:
-            case 237:
-            case 278:
-            case 281:
-            case 282:
-            case 283:
-            case 284:
-            case 285:
+            case 149 /* Parameter */:
+            case 151 /* PropertySignature */:
+            case 152 /* PropertyDeclaration */:
+            case 153 /* MethodSignature */:
+            case 154 /* MethodDeclaration */:
+            case 155 /* Constructor */:
+            case 156 /* GetAccessor */:
+            case 157 /* SetAccessor */:
+            case 158 /* CallSignature */:
+            case 159 /* ConstructSignature */:
+            case 160 /* IndexSignature */:
+            case 161 /* TypePredicate */:
+            case 163 /* FunctionType */:
+            case 164 /* ConstructorType */:
+            case 173 /* ParenthesizedType */:
+            case 175 /* TypeOperator */:
+            case 177 /* MappedType */:
+            case 190 /* TypeAssertionExpression */:
+            case 192 /* FunctionExpression */:
+            case 193 /* ArrowFunction */:
+            case 208 /* AsExpression */:
+            case 232 /* VariableDeclaration */:
+            case 234 /* FunctionDeclaration */:
+            case 237 /* TypeAliasDeclaration */:
+            case 278 /* JSDocTypeExpression */:
+            case 281 /* JSDocNullableType */:
+            case 282 /* JSDocNonNullableType */:
+            case 283 /* JSDocOptionalType */:
+            case 284 /* JSDocFunctionType */:
+            case 285 /* JSDocVariadicType */:
                 return true;
         }
         return false;
     }
     ts.couldHaveType = couldHaveType;
+    /** True if has initializer node attached to it. */
+    /* @internal */
     function hasInitializer(node) {
         return !!node.initializer;
     }
     ts.hasInitializer = hasInitializer;
+    /** True if has initializer node attached to it. */
+    /* @internal */
     function hasOnlyExpressionInitializer(node) {
         return hasInitializer(node) && !ts.isForStatement(node) && !ts.isForInStatement(node) && !ts.isForOfStatement(node) && !ts.isJsxAttribute(node);
     }
     ts.hasOnlyExpressionInitializer = hasOnlyExpressionInitializer;
     function isObjectLiteralElement(node) {
         switch (node.kind) {
-            case 262:
-            case 264:
-            case 270:
-            case 271:
-            case 154:
-            case 156:
-            case 157:
+            case 262 /* JsxAttribute */:
+            case 264 /* JsxSpreadAttribute */:
+            case 270 /* PropertyAssignment */:
+            case 271 /* ShorthandPropertyAssignment */:
+            case 154 /* MethodDeclaration */:
+            case 156 /* GetAccessor */:
+            case 157 /* SetAccessor */:
                 return true;
             default:
                 return false;
         }
     }
     ts.isObjectLiteralElement = isObjectLiteralElement;
+    /* @internal */
     function isTypeReferenceType(node) {
-        return node.kind === 162 || node.kind === 207;
+        return node.kind === 162 /* TypeReference */ || node.kind === 207 /* ExpressionWithTypeArguments */;
     }
     ts.isTypeReferenceType = isTypeReferenceType;
     var MAX_SMI_X86 = 1073741823;
+    /* @internal */
     function guessIndentation(lines) {
         var indentation = MAX_SMI_X86;
         for (var _i = 0, lines_1 = lines; _i < lines_1.length; _i++) {
@@ -11783,25 +13696,1261 @@ var ts;
     }
     ts.guessIndentation = guessIndentation;
     function isStringLiteralLike(node) {
-        return node.kind === 9 || node.kind === 13;
+        return node.kind === 9 /* StringLiteral */ || node.kind === 13 /* NoSubstitutionTemplateLiteral */;
     }
     ts.isStringLiteralLike = isStringLiteralLike;
+    /** @internal */
     function isNamedImportsOrExports(node) {
-        return node.kind === 247 || node.kind === 251;
+        return node.kind === 247 /* NamedImports */ || node.kind === 251 /* NamedExports */;
     }
     ts.isNamedImportsOrExports = isNamedImportsOrExports;
+    function Symbol(flags, name) {
+        this.flags = flags;
+        this.escapedName = name;
+        this.declarations = undefined;
+        this.valueDeclaration = undefined;
+        this.id = undefined;
+        this.mergeId = undefined;
+        this.parent = undefined;
+    }
+    function Type(checker, flags) {
+        this.flags = flags;
+        if (Debug.isDebugging) {
+            this.checker = checker;
+        }
+    }
+    function Signature() { } // tslint:disable-line no-empty
+    function Node(kind, pos, end) {
+        this.pos = pos;
+        this.end = end;
+        this.kind = kind;
+        this.id = 0;
+        this.flags = 0 /* None */;
+        this.modifierFlagsCache = 0 /* None */;
+        this.transformFlags = 0 /* None */;
+        this.parent = undefined;
+        this.original = undefined;
+    }
+    function SourceMapSource(fileName, text, skipTrivia) {
+        this.fileName = fileName;
+        this.text = text;
+        this.skipTrivia = skipTrivia || (function (pos) { return pos; });
+    }
+    ts.objectAllocator = {
+        getNodeConstructor: function () { return Node; },
+        getTokenConstructor: function () { return Node; },
+        getIdentifierConstructor: function () { return Node; },
+        getSourceFileConstructor: function () { return Node; },
+        getSymbolConstructor: function () { return Symbol; },
+        getTypeConstructor: function () { return Type; },
+        getSignatureConstructor: function () { return Signature; },
+        getSourceMapSourceConstructor: function () { return SourceMapSource; },
+    };
+    function formatStringFromArgs(text, args, baseIndex) {
+        if (baseIndex === void 0) { baseIndex = 0; }
+        return text.replace(/{(\d+)}/g, function (_match, index) { return Debug.assertDefined(args[+index + baseIndex]); });
+    }
+    ts.formatStringFromArgs = formatStringFromArgs;
+    function getLocaleSpecificMessage(message) {
+        return ts.localizedDiagnosticMessages && ts.localizedDiagnosticMessages[message.key] || message.message;
+    }
+    ts.getLocaleSpecificMessage = getLocaleSpecificMessage;
+    function createFileDiagnostic(file, start, length, message) {
+        Debug.assertGreaterThanOrEqual(start, 0);
+        Debug.assertGreaterThanOrEqual(length, 0);
+        if (file) {
+            Debug.assertLessThanOrEqual(start, file.text.length);
+            Debug.assertLessThanOrEqual(start + length, file.text.length);
+        }
+        var text = getLocaleSpecificMessage(message);
+        if (arguments.length > 4) {
+            text = formatStringFromArgs(text, arguments, 4);
+        }
+        return {
+            file: file,
+            start: start,
+            length: length,
+            messageText: text,
+            category: message.category,
+            code: message.code,
+            reportsUnnecessary: message.reportsUnnecessary,
+        };
+    }
+    ts.createFileDiagnostic = createFileDiagnostic;
+    /* @internal */
+    function formatMessage(_dummy, message) {
+        var text = getLocaleSpecificMessage(message);
+        if (arguments.length > 2) {
+            text = formatStringFromArgs(text, arguments, 2);
+        }
+        return text;
+    }
+    ts.formatMessage = formatMessage;
+    function createCompilerDiagnostic(message) {
+        var text = getLocaleSpecificMessage(message);
+        if (arguments.length > 1) {
+            text = formatStringFromArgs(text, arguments, 1);
+        }
+        return {
+            file: undefined,
+            start: undefined,
+            length: undefined,
+            messageText: text,
+            category: message.category,
+            code: message.code,
+            reportsUnnecessary: message.reportsUnnecessary,
+        };
+    }
+    ts.createCompilerDiagnostic = createCompilerDiagnostic;
+    function createCompilerDiagnosticFromMessageChain(chain) {
+        return {
+            file: undefined,
+            start: undefined,
+            length: undefined,
+            code: chain.code,
+            category: chain.category,
+            messageText: chain.next ? chain : chain.messageText,
+        };
+    }
+    ts.createCompilerDiagnosticFromMessageChain = createCompilerDiagnosticFromMessageChain;
+    function chainDiagnosticMessages(details, message) {
+        var text = getLocaleSpecificMessage(message);
+        if (arguments.length > 2) {
+            text = formatStringFromArgs(text, arguments, 2);
+        }
+        return {
+            messageText: text,
+            category: message.category,
+            code: message.code,
+            next: details
+        };
+    }
+    ts.chainDiagnosticMessages = chainDiagnosticMessages;
+    function concatenateDiagnosticMessageChains(headChain, tailChain) {
+        var lastChain = headChain;
+        while (lastChain.next) {
+            lastChain = lastChain.next;
+        }
+        lastChain.next = tailChain;
+        return headChain;
+    }
+    ts.concatenateDiagnosticMessageChains = concatenateDiagnosticMessageChains;
+    function getDiagnosticFilePath(diagnostic) {
+        return diagnostic.file ? diagnostic.file.path : undefined;
+    }
+    function compareDiagnostics(d1, d2) {
+        return ts.compareStringsCaseSensitive(getDiagnosticFilePath(d1), getDiagnosticFilePath(d2)) ||
+            ts.compareValues(d1.start, d2.start) ||
+            ts.compareValues(d1.length, d2.length) ||
+            ts.compareValues(d1.code, d2.code) ||
+            compareMessageText(d1.messageText, d2.messageText) ||
+            0 /* EqualTo */;
+    }
+    ts.compareDiagnostics = compareDiagnostics;
+    function compareMessageText(t1, t2) {
+        var text1 = t1;
+        var text2 = t2;
+        while (text1 && text2) {
+            // We still have both chains.
+            var string1 = ts.isString(text1) ? text1 : text1.messageText;
+            var string2 = ts.isString(text2) ? text2 : text2.messageText;
+            var res = ts.compareStringsCaseSensitive(string1, string2);
+            if (res) {
+                return res;
+            }
+            text1 = ts.isString(text1) ? undefined : text1.next;
+            text2 = ts.isString(text2) ? undefined : text2.next;
+        }
+        if (!text1 && !text2) {
+            // if the chains are done, then these messages are the same.
+            return 0 /* EqualTo */;
+        }
+        // We still have one chain remaining.  The shorter chain should come first.
+        return text1 ? 1 /* GreaterThan */ : -1 /* LessThan */;
+    }
+    function getEmitScriptTarget(compilerOptions) {
+        return compilerOptions.target || 0 /* ES3 */;
+    }
+    ts.getEmitScriptTarget = getEmitScriptTarget;
+    function getEmitModuleKind(compilerOptions) {
+        return typeof compilerOptions.module === "number" ?
+            compilerOptions.module :
+            getEmitScriptTarget(compilerOptions) >= 2 /* ES2015 */ ? ts.ModuleKind.ES2015 : ts.ModuleKind.CommonJS;
+    }
+    ts.getEmitModuleKind = getEmitModuleKind;
+    function getEmitModuleResolutionKind(compilerOptions) {
+        var moduleResolution = compilerOptions.moduleResolution;
+        if (moduleResolution === undefined) {
+            moduleResolution = getEmitModuleKind(compilerOptions) === ts.ModuleKind.CommonJS ? ts.ModuleResolutionKind.NodeJs : ts.ModuleResolutionKind.Classic;
+        }
+        return moduleResolution;
+    }
+    ts.getEmitModuleResolutionKind = getEmitModuleResolutionKind;
+    function unreachableCodeIsError(options) {
+        return options.allowUnreachableCode === false;
+    }
+    ts.unreachableCodeIsError = unreachableCodeIsError;
+    function unusedLabelIsError(options) {
+        return options.allowUnusedLabels === false;
+    }
+    ts.unusedLabelIsError = unusedLabelIsError;
+    function getAreDeclarationMapsEnabled(options) {
+        return !!(options.declaration && options.declarationMap);
+    }
+    ts.getAreDeclarationMapsEnabled = getAreDeclarationMapsEnabled;
+    function getAllowSyntheticDefaultImports(compilerOptions) {
+        var moduleKind = getEmitModuleKind(compilerOptions);
+        return compilerOptions.allowSyntheticDefaultImports !== undefined
+            ? compilerOptions.allowSyntheticDefaultImports
+            : compilerOptions.esModuleInterop
+                ? moduleKind !== ts.ModuleKind.None && moduleKind < ts.ModuleKind.ES2015
+                : moduleKind === ts.ModuleKind.System;
+    }
+    ts.getAllowSyntheticDefaultImports = getAllowSyntheticDefaultImports;
+    function getEmitDeclarations(compilerOptions) {
+        return !!(compilerOptions.declaration || compilerOptions.composite);
+    }
+    ts.getEmitDeclarations = getEmitDeclarations;
+    function getStrictOptionValue(compilerOptions, flag) {
+        return compilerOptions[flag] === undefined ? !!compilerOptions.strict : !!compilerOptions[flag];
+    }
+    ts.getStrictOptionValue = getStrictOptionValue;
+    function hasZeroOrOneAsteriskCharacter(str) {
+        var seenAsterisk = false;
+        for (var i = 0; i < str.length; i++) {
+            if (str.charCodeAt(i) === 42 /* asterisk */) {
+                if (!seenAsterisk) {
+                    seenAsterisk = true;
+                }
+                else {
+                    // have already seen asterisk
+                    return false;
+                }
+            }
+        }
+        return true;
+    }
+    ts.hasZeroOrOneAsteriskCharacter = hasZeroOrOneAsteriskCharacter;
+    /**
+     * Internally, we represent paths as strings with '/' as the directory separator.
+     * When we make system calls (eg: LanguageServiceHost.getDirectory()),
+     * we expect the host to correctly handle paths in our specified format.
+     */
+    ts.directorySeparator = "/";
+    var altDirectorySeparator = "\\";
+    var urlSchemeSeparator = "://";
+    var backslashRegExp = /\\/g;
+    /**
+     * Normalize path separators.
+     */
+    function normalizeSlashes(path) {
+        return path.replace(backslashRegExp, ts.directorySeparator);
+    }
+    ts.normalizeSlashes = normalizeSlashes;
+    function isVolumeCharacter(charCode) {
+        return (charCode >= 97 /* a */ && charCode <= 122 /* z */) ||
+            (charCode >= 65 /* A */ && charCode <= 90 /* Z */);
+    }
+    function getFileUrlVolumeSeparatorEnd(url, start) {
+        var ch0 = url.charCodeAt(start);
+        if (ch0 === 58 /* colon */)
+            return start + 1;
+        if (ch0 === 37 /* percent */ && url.charCodeAt(start + 1) === 51 /* _3 */) {
+            var ch2 = url.charCodeAt(start + 2);
+            if (ch2 === 97 /* a */ || ch2 === 65 /* A */)
+                return start + 3;
+        }
+        return -1;
+    }
+    /**
+     * Returns length of the root part of a path or URL (i.e. length of "/", "x:/", "//server/share/, file:///user/files").
+     * If the root is part of a URL, the twos-complement of the root length is returned.
+     */
+    function getEncodedRootLength(path) {
+        if (!path)
+            return 0;
+        var ch0 = path.charCodeAt(0);
+        // POSIX or UNC
+        if (ch0 === 47 /* slash */ || ch0 === 92 /* backslash */) {
+            if (path.charCodeAt(1) !== ch0)
+                return 1; // POSIX: "/" (or non-normalized "\")
+            var p1 = path.indexOf(ch0 === 47 /* slash */ ? ts.directorySeparator : altDirectorySeparator, 2);
+            if (p1 < 0)
+                return path.length; // UNC: "//server" or "\\server"
+            return p1 + 1; // UNC: "//server/" or "\\server\"
+        }
+        // DOS
+        if (isVolumeCharacter(ch0) && path.charCodeAt(1) === 58 /* colon */) {
+            var ch2 = path.charCodeAt(2);
+            if (ch2 === 47 /* slash */ || ch2 === 92 /* backslash */)
+                return 3; // DOS: "c:/" or "c:\"
+            if (path.length === 2)
+                return 2; // DOS: "c:" (but not "c:d")
+        }
+        // URL
+        var schemeEnd = path.indexOf(urlSchemeSeparator);
+        if (schemeEnd !== -1) {
+            var authorityStart = schemeEnd + urlSchemeSeparator.length;
+            var authorityEnd = path.indexOf(ts.directorySeparator, authorityStart);
+            if (authorityEnd !== -1) { // URL: "file:///", "file://server/", "file://server/path"
+                // For local "file" URLs, include the leading DOS volume (if present).
+                // Per https://www.ietf.org/rfc/rfc1738.txt, a host of "" or "localhost" is a
+                // special case interpreted as "the machine from which the URL is being interpreted".
+                var scheme = path.slice(0, schemeEnd);
+                var authority = path.slice(authorityStart, authorityEnd);
+                if (scheme === "file" && (authority === "" || authority === "localhost") &&
+                    isVolumeCharacter(path.charCodeAt(authorityEnd + 1))) {
+                    var volumeSeparatorEnd = getFileUrlVolumeSeparatorEnd(path, authorityEnd + 2);
+                    if (volumeSeparatorEnd !== -1) {
+                        if (path.charCodeAt(volumeSeparatorEnd) === 47 /* slash */) {
+                            // URL: "file:///c:/", "file://localhost/c:/", "file:///c%3a/", "file://localhost/c%3a/"
+                            return ~(volumeSeparatorEnd + 1);
+                        }
+                        if (volumeSeparatorEnd === path.length) {
+                            // URL: "file:///c:", "file://localhost/c:", "file:///c$3a", "file://localhost/c%3a"
+                            // but not "file:///c:d" or "file:///c%3ad"
+                            return ~volumeSeparatorEnd;
+                        }
+                    }
+                }
+                return ~(authorityEnd + 1); // URL: "file://server/", "http://server/"
+            }
+            return ~path.length; // URL: "file://server", "http://server"
+        }
+        // relative
+        return 0;
+    }
+    /**
+     * Returns length of the root part of a path or URL (i.e. length of "/", "x:/", "//server/share/, file:///user/files").
+     *
+     * For example:
+     * ```ts
+     * getRootLength("a") === 0                   // ""
+     * getRootLength("/") === 1                   // "/"
+     * getRootLength("c:") === 2                  // "c:"
+     * getRootLength("c:d") === 0                 // ""
+     * getRootLength("c:/") === 3                 // "c:/"
+     * getRootLength("c:\\") === 3                // "c:\\"
+     * getRootLength("//server") === 7            // "//server"
+     * getRootLength("//server/share") === 8      // "//server/"
+     * getRootLength("\\\\server") === 7          // "\\\\server"
+     * getRootLength("\\\\server\\share") === 8   // "\\\\server\\"
+     * getRootLength("file:///path") === 8        // "file:///"
+     * getRootLength("file:///c:") === 10         // "file:///c:"
+     * getRootLength("file:///c:d") === 8         // "file:///"
+     * getRootLength("file:///c:/path") === 11    // "file:///c:/"
+     * getRootLength("file://server") === 13      // "file://server"
+     * getRootLength("file://server/path") === 14 // "file://server/"
+     * getRootLength("http://server") === 13      // "http://server"
+     * getRootLength("http://server/path") === 14 // "http://server/"
+     * ```
+     */
+    function getRootLength(path) {
+        var rootLength = getEncodedRootLength(path);
+        return rootLength < 0 ? ~rootLength : rootLength;
+    }
+    ts.getRootLength = getRootLength;
+    // TODO(rbuckton): replace references with `resolvePath`
+    function normalizePath(path) {
+        return resolvePath(path);
+    }
+    ts.normalizePath = normalizePath;
+    function normalizePathAndParts(path) {
+        path = normalizeSlashes(path);
+        var _a = reducePathComponents(getPathComponents(path)), root = _a[0], parts = _a.slice(1);
+        if (parts.length) {
+            var joinedParts = root + parts.join(ts.directorySeparator);
+            return { path: hasTrailingDirectorySeparator(path) ? ensureTrailingDirectorySeparator(joinedParts) : joinedParts, parts: parts };
+        }
+        else {
+            return { path: root, parts: parts };
+        }
+    }
+    ts.normalizePathAndParts = normalizePathAndParts;
+    function getDirectoryPath(path) {
+        path = normalizeSlashes(path);
+        // If the path provided is itself the root, then return it.
+        var rootLength = getRootLength(path);
+        if (rootLength === path.length)
+            return path;
+        // return the leading portion of the path up to the last (non-terminal) directory separator
+        // but not including any trailing directory separator.
+        path = removeTrailingDirectorySeparator(path);
+        return path.slice(0, Math.max(rootLength, path.lastIndexOf(ts.directorySeparator)));
+    }
+    ts.getDirectoryPath = getDirectoryPath;
+    function isUrl(path) {
+        return getEncodedRootLength(path) < 0;
+    }
+    ts.isUrl = isUrl;
+    function pathIsRelative(path) {
+        return /^\.\.?($|[\\/])/.test(path);
+    }
+    ts.pathIsRelative = pathIsRelative;
+    /**
+     * Determines whether a path is an absolute path (e.g. starts with `/`, or a dos path
+     * like `c:`, `c:\` or `c:/`).
+     */
+    function isRootedDiskPath(path) {
+        return getEncodedRootLength(path) > 0;
+    }
+    ts.isRootedDiskPath = isRootedDiskPath;
+    /**
+     * Determines whether a path consists only of a path root.
+     */
+    function isDiskPathRoot(path) {
+        var rootLength = getEncodedRootLength(path);
+        return rootLength > 0 && rootLength === path.length;
+    }
+    ts.isDiskPathRoot = isDiskPathRoot;
+    function convertToRelativePath(absoluteOrRelativePath, basePath, getCanonicalFileName) {
+        return !isRootedDiskPath(absoluteOrRelativePath)
+            ? absoluteOrRelativePath
+            : getRelativePathToDirectoryOrUrl(basePath, absoluteOrRelativePath, basePath, getCanonicalFileName, /*isAbsolutePathAnUrl*/ false);
+    }
+    ts.convertToRelativePath = convertToRelativePath;
+    function pathComponents(path, rootLength) {
+        var root = path.substring(0, rootLength);
+        var rest = path.substring(rootLength).split(ts.directorySeparator);
+        if (rest.length && !ts.lastOrUndefined(rest))
+            rest.pop();
+        return [root].concat(rest);
+    }
+    /**
+     * Parse a path into an array containing a root component (at index 0) and zero or more path
+     * components (at indices > 0). The result is not normalized.
+     * If the path is relative, the root component is `""`.
+     * If the path is absolute, the root component includes the first path separator (`/`).
+     */
+    function getPathComponents(path, currentDirectory) {
+        if (currentDirectory === void 0) { currentDirectory = ""; }
+        path = combinePaths(currentDirectory, path);
+        var rootLength = getRootLength(path);
+        return pathComponents(path, rootLength);
+    }
+    ts.getPathComponents = getPathComponents;
+    /**
+     * Reduce an array of path components to a more simplified path by navigating any
+     * `"."` or `".."` entries in the path.
+     */
+    function reducePathComponents(components) {
+        if (!ts.some(components))
+            return [];
+        var reduced = [components[0]];
+        for (var i = 1; i < components.length; i++) {
+            var component = components[i];
+            if (!component)
+                continue;
+            if (component === ".")
+                continue;
+            if (component === "..") {
+                if (reduced.length > 1) {
+                    if (reduced[reduced.length - 1] !== "..") {
+                        reduced.pop();
+                        continue;
+                    }
+                }
+                else if (reduced[0])
+                    continue;
+            }
+            reduced.push(component);
+        }
+        return reduced;
+    }
+    ts.reducePathComponents = reducePathComponents;
+    /**
+     * Parse a path into an array containing a root component (at index 0) and zero or more path
+     * components (at indices > 0). The result is normalized.
+     * If the path is relative, the root component is `""`.
+     * If the path is absolute, the root component includes the first path separator (`/`).
+     */
+    function getNormalizedPathComponents(path, currentDirectory) {
+        return reducePathComponents(getPathComponents(path, currentDirectory));
+    }
+    ts.getNormalizedPathComponents = getNormalizedPathComponents;
+    function getNormalizedAbsolutePath(fileName, currentDirectory) {
+        return getPathFromPathComponents(getNormalizedPathComponents(fileName, currentDirectory));
+    }
+    ts.getNormalizedAbsolutePath = getNormalizedAbsolutePath;
+    /**
+     * Formats a parsed path consisting of a root component (at index 0) and zero or more path
+     * segments (at indices > 0).
+     */
+    function getPathFromPathComponents(pathComponents) {
+        if (pathComponents.length === 0)
+            return "";
+        var root = pathComponents[0] && ensureTrailingDirectorySeparator(pathComponents[0]);
+        if (pathComponents.length === 1)
+            return root;
+        return root + pathComponents.slice(1).join(ts.directorySeparator);
+    }
+    ts.getPathFromPathComponents = getPathFromPathComponents;
+    function getPathComponentsRelativeTo(from, to, stringEqualityComparer, getCanonicalFileName) {
+        var fromComponents = reducePathComponents(getPathComponents(from));
+        var toComponents = reducePathComponents(getPathComponents(to));
+        var start;
+        for (start = 0; start < fromComponents.length && start < toComponents.length; start++) {
+            var fromComponent = getCanonicalFileName(fromComponents[start]);
+            var toComponent = getCanonicalFileName(toComponents[start]);
+            var comparer = start === 0 ? ts.equateStringsCaseInsensitive : stringEqualityComparer;
+            if (!comparer(fromComponent, toComponent))
+                break;
+        }
+        if (start === 0) {
+            return toComponents;
+        }
+        var components = toComponents.slice(start);
+        var relative = [];
+        for (; start < fromComponents.length; start++) {
+            relative.push("..");
+        }
+        return [""].concat(relative, components);
+    }
+    function getRelativePathFromFile(from, to, getCanonicalFileName) {
+        return ensurePathIsNonModuleName(getRelativePathFromDirectory(getDirectoryPath(from), to, getCanonicalFileName));
+    }
+    ts.getRelativePathFromFile = getRelativePathFromFile;
+    function getRelativePathFromDirectory(fromDirectory, to, getCanonicalFileNameOrIgnoreCase) {
+        Debug.assert((getRootLength(fromDirectory) > 0) === (getRootLength(to) > 0), "Paths must either both be absolute or both be relative");
+        var getCanonicalFileName = typeof getCanonicalFileNameOrIgnoreCase === "function" ? getCanonicalFileNameOrIgnoreCase : ts.identity;
+        var ignoreCase = typeof getCanonicalFileNameOrIgnoreCase === "boolean" ? getCanonicalFileNameOrIgnoreCase : false;
+        var pathComponents = getPathComponentsRelativeTo(fromDirectory, to, ignoreCase ? ts.equateStringsCaseInsensitive : ts.equateStringsCaseSensitive, getCanonicalFileName);
+        return getPathFromPathComponents(pathComponents);
+    }
+    ts.getRelativePathFromDirectory = getRelativePathFromDirectory;
+    function getRelativePathToDirectoryOrUrl(directoryPathOrUrl, relativeOrAbsolutePath, currentDirectory, getCanonicalFileName, isAbsolutePathAnUrl) {
+        var pathComponents = getPathComponentsRelativeTo(resolvePath(currentDirectory, directoryPathOrUrl), resolvePath(currentDirectory, relativeOrAbsolutePath), ts.equateStringsCaseSensitive, getCanonicalFileName);
+        var firstComponent = pathComponents[0];
+        if (isAbsolutePathAnUrl && isRootedDiskPath(firstComponent)) {
+            var prefix = firstComponent.charAt(0) === ts.directorySeparator ? "file://" : "file:///";
+            pathComponents[0] = prefix + firstComponent;
+        }
+        return getPathFromPathComponents(pathComponents);
+    }
+    ts.getRelativePathToDirectoryOrUrl = getRelativePathToDirectoryOrUrl;
+    /**
+     * Ensures a path is either absolute (prefixed with `/` or `c:`) or dot-relative (prefixed
+     * with `./` or `../`) so as not to be confused with an unprefixed module name.
+     */
+    function ensurePathIsNonModuleName(path) {
+        return getRootLength(path) === 0 && !pathIsRelative(path) ? "./" + path : path;
+    }
+    ts.ensurePathIsNonModuleName = ensurePathIsNonModuleName;
+    function getBaseFileName(path, extensions, ignoreCase) {
+        path = normalizeSlashes(path);
+        // if the path provided is itself the root, then it has not file name.
+        var rootLength = getRootLength(path);
+        if (rootLength === path.length)
+            return "";
+        // return the trailing portion of the path starting after the last (non-terminal) directory
+        // separator but not including any trailing directory separator.
+        path = removeTrailingDirectorySeparator(path);
+        var name = path.slice(Math.max(getRootLength(path), path.lastIndexOf(ts.directorySeparator) + 1));
+        var extension = extensions !== undefined && ignoreCase !== undefined ? getAnyExtensionFromPath(name, extensions, ignoreCase) : undefined;
+        return extension ? name.slice(0, name.length - extension.length) : name;
+    }
+    ts.getBaseFileName = getBaseFileName;
+    /**
+     * Combines paths. If a path is absolute, it replaces any previous path.
+     */
+    function combinePaths(path) {
+        var paths = [];
+        for (var _i = 1; _i < arguments.length; _i++) {
+            paths[_i - 1] = arguments[_i];
+        }
+        if (path)
+            path = normalizeSlashes(path);
+        for (var _a = 0, paths_1 = paths; _a < paths_1.length; _a++) {
+            var relativePath = paths_1[_a];
+            if (!relativePath)
+                continue;
+            relativePath = normalizeSlashes(relativePath);
+            if (!path || getRootLength(relativePath) !== 0) {
+                path = relativePath;
+            }
+            else {
+                path = ensureTrailingDirectorySeparator(path) + relativePath;
+            }
+        }
+        return path;
+    }
+    ts.combinePaths = combinePaths;
+    /**
+     * Combines and resolves paths. If a path is absolute, it replaces any previous path. Any
+     * `.` and `..` path components are resolved.
+     */
+    function resolvePath(path) {
+        var paths = [];
+        for (var _i = 1; _i < arguments.length; _i++) {
+            paths[_i - 1] = arguments[_i];
+        }
+        var combined = ts.some(paths) ? combinePaths.apply(void 0, [path].concat(paths)) : normalizeSlashes(path);
+        var normalized = getPathFromPathComponents(reducePathComponents(getPathComponents(combined)));
+        return normalized && hasTrailingDirectorySeparator(combined) ? ensureTrailingDirectorySeparator(normalized) : normalized;
+    }
+    ts.resolvePath = resolvePath;
+    /**
+     * Determines whether a path has a trailing separator (`/` or `\\`).
+     */
+    function hasTrailingDirectorySeparator(path) {
+        if (path.length === 0)
+            return false;
+        var ch = path.charCodeAt(path.length - 1);
+        return ch === 47 /* slash */ || ch === 92 /* backslash */;
+    }
+    ts.hasTrailingDirectorySeparator = hasTrailingDirectorySeparator;
+    function removeTrailingDirectorySeparator(path) {
+        if (hasTrailingDirectorySeparator(path)) {
+            return path.substr(0, path.length - 1);
+        }
+        return path;
+    }
+    ts.removeTrailingDirectorySeparator = removeTrailingDirectorySeparator;
+    function ensureTrailingDirectorySeparator(path) {
+        if (!hasTrailingDirectorySeparator(path)) {
+            return path + ts.directorySeparator;
+        }
+        return path;
+    }
+    ts.ensureTrailingDirectorySeparator = ensureTrailingDirectorySeparator;
+    function comparePathsWorker(a, b, componentComparer) {
+        if (a === b)
+            return 0 /* EqualTo */;
+        if (a === undefined)
+            return -1 /* LessThan */;
+        if (b === undefined)
+            return 1 /* GreaterThan */;
+        var aComponents = reducePathComponents(getPathComponents(a));
+        var bComponents = reducePathComponents(getPathComponents(b));
+        var sharedLength = Math.min(aComponents.length, bComponents.length);
+        for (var i = 0; i < sharedLength; i++) {
+            var stringComparer = i === 0 ? ts.compareStringsCaseInsensitive : componentComparer;
+            var result = stringComparer(aComponents[i], bComponents[i]);
+            if (result !== 0 /* EqualTo */) {
+                return result;
+            }
+        }
+        return ts.compareValues(aComponents.length, bComponents.length);
+    }
+    /**
+     * Performs a case-sensitive comparison of two paths.
+     */
+    function comparePathsCaseSensitive(a, b) {
+        return comparePathsWorker(a, b, ts.compareStringsCaseSensitive);
+    }
+    ts.comparePathsCaseSensitive = comparePathsCaseSensitive;
+    /**
+     * Performs a case-insensitive comparison of two paths.
+     */
+    function comparePathsCaseInsensitive(a, b) {
+        return comparePathsWorker(a, b, ts.compareStringsCaseInsensitive);
+    }
+    ts.comparePathsCaseInsensitive = comparePathsCaseInsensitive;
+    function comparePaths(a, b, currentDirectory, ignoreCase) {
+        if (typeof currentDirectory === "string") {
+            a = combinePaths(currentDirectory, a);
+            b = combinePaths(currentDirectory, b);
+        }
+        else if (typeof currentDirectory === "boolean") {
+            ignoreCase = currentDirectory;
+        }
+        return comparePathsWorker(a, b, ts.getStringComparer(ignoreCase));
+    }
+    ts.comparePaths = comparePaths;
+    function containsPath(parent, child, currentDirectory, ignoreCase) {
+        if (typeof currentDirectory === "string") {
+            parent = combinePaths(currentDirectory, parent);
+            child = combinePaths(currentDirectory, child);
+        }
+        else if (typeof currentDirectory === "boolean") {
+            ignoreCase = currentDirectory;
+        }
+        if (parent === undefined || child === undefined)
+            return false;
+        if (parent === child)
+            return true;
+        var parentComponents = reducePathComponents(getPathComponents(parent));
+        var childComponents = reducePathComponents(getPathComponents(child));
+        if (childComponents.length < parentComponents.length) {
+            return false;
+        }
+        var componentEqualityComparer = ignoreCase ? ts.equateStringsCaseInsensitive : ts.equateStringsCaseSensitive;
+        for (var i = 0; i < parentComponents.length; i++) {
+            var equalityComparer = i === 0 ? ts.equateStringsCaseInsensitive : componentEqualityComparer;
+            if (!equalityComparer(parentComponents[i], childComponents[i])) {
+                return false;
+            }
+        }
+        return true;
+    }
+    ts.containsPath = containsPath;
+    function tryRemoveDirectoryPrefix(path, dirPath) {
+        var a = ts.tryRemovePrefix(path, dirPath);
+        if (a === undefined)
+            return undefined;
+        switch (a.charCodeAt(0)) {
+            case 47 /* slash */:
+            case 92 /* backslash */:
+                return a.slice(1);
+            default:
+                return undefined;
+        }
+    }
+    ts.tryRemoveDirectoryPrefix = tryRemoveDirectoryPrefix;
+    // Reserved characters, forces escaping of any non-word (or digit), non-whitespace character.
+    // It may be inefficient (we could just match (/[-[\]{}()*+?.,\\^$|#\s]/g), but this is future
+    // proof.
+    var reservedCharacterPattern = /[^\w\s\/]/g;
+    var wildcardCharCodes = [42 /* asterisk */, 63 /* question */];
+    function hasExtension(fileName) {
+        return ts.stringContains(getBaseFileName(fileName), ".");
+    }
+    ts.hasExtension = hasExtension;
+    ts.commonPackageFolders = ["node_modules", "bower_components", "jspm_packages"];
+    var implicitExcludePathRegexPattern = "(?!(" + ts.commonPackageFolders.join("|") + ")(/|$))";
+    var filesMatcher = {
+        /**
+         * Matches any single directory segment unless it is the last segment and a .min.js file
+         * Breakdown:
+         *  [^./]                   # matches everything up to the first . character (excluding directory separators)
+         *  (\\.(?!min\\.js$))?     # matches . characters but not if they are part of the .min.js file extension
+         */
+        singleAsteriskRegexFragment: "([^./]|(\\.(?!min\\.js$))?)*",
+        /**
+         * Regex for the ** wildcard. Matches any number of subdirectories. When used for including
+         * files or directories, does not match subdirectories that start with a . character
+         */
+        doubleAsteriskRegexFragment: "(/" + implicitExcludePathRegexPattern + "[^/.][^/]*)*?",
+        replaceWildcardCharacter: function (match) { return replaceWildcardCharacter(match, filesMatcher.singleAsteriskRegexFragment); }
+    };
+    var directoriesMatcher = {
+        singleAsteriskRegexFragment: "[^/]*",
+        /**
+         * Regex for the ** wildcard. Matches any number of subdirectories. When used for including
+         * files or directories, does not match subdirectories that start with a . character
+         */
+        doubleAsteriskRegexFragment: "(/" + implicitExcludePathRegexPattern + "[^/.][^/]*)*?",
+        replaceWildcardCharacter: function (match) { return replaceWildcardCharacter(match, directoriesMatcher.singleAsteriskRegexFragment); }
+    };
+    var excludeMatcher = {
+        singleAsteriskRegexFragment: "[^/]*",
+        doubleAsteriskRegexFragment: "(/.+?)?",
+        replaceWildcardCharacter: function (match) { return replaceWildcardCharacter(match, excludeMatcher.singleAsteriskRegexFragment); }
+    };
+    var wildcardMatchers = {
+        files: filesMatcher,
+        directories: directoriesMatcher,
+        exclude: excludeMatcher
+    };
+    function getRegularExpressionForWildcard(specs, basePath, usage) {
+        var patterns = getRegularExpressionsForWildcards(specs, basePath, usage);
+        if (!patterns || !patterns.length) {
+            return undefined;
+        }
+        var pattern = patterns.map(function (pattern) { return "(" + pattern + ")"; }).join("|");
+        // If excluding, match "foo/bar/baz...", but if including, only allow "foo".
+        var terminator = usage === "exclude" ? "($|/)" : "$";
+        return "^(" + pattern + ")" + terminator;
+    }
+    ts.getRegularExpressionForWildcard = getRegularExpressionForWildcard;
+    function getRegularExpressionsForWildcards(specs, basePath, usage) {
+        if (specs === undefined || specs.length === 0) {
+            return undefined;
+        }
+        return ts.flatMap(specs, function (spec) {
+            return spec && getSubPatternFromSpec(spec, basePath, usage, wildcardMatchers[usage]);
+        });
+    }
+    /**
+     * An "includes" path "foo" is implicitly a glob "foo/** /*" (without the space) if its last component has no extension,
+     * and does not contain any glob characters itself.
+     */
+    function isImplicitGlob(lastPathComponent) {
+        return !/[.*?]/.test(lastPathComponent);
+    }
+    ts.isImplicitGlob = isImplicitGlob;
+    function getSubPatternFromSpec(spec, basePath, usage, _a) {
+        var singleAsteriskRegexFragment = _a.singleAsteriskRegexFragment, doubleAsteriskRegexFragment = _a.doubleAsteriskRegexFragment, replaceWildcardCharacter = _a.replaceWildcardCharacter;
+        var subpattern = "";
+        var hasWrittenComponent = false;
+        var components = getNormalizedPathComponents(spec, basePath);
+        var lastComponent = ts.last(components);
+        if (usage !== "exclude" && lastComponent === "**") {
+            return undefined;
+        }
+        // getNormalizedPathComponents includes the separator for the root component.
+        // We need to remove to create our regex correctly.
+        components[0] = removeTrailingDirectorySeparator(components[0]);
+        if (isImplicitGlob(lastComponent)) {
+            components.push("**", "*");
+        }
+        var optionalCount = 0;
+        for (var _i = 0, components_1 = components; _i < components_1.length; _i++) {
+            var component = components_1[_i];
+            if (component === "**") {
+                subpattern += doubleAsteriskRegexFragment;
+            }
+            else {
+                if (usage === "directories") {
+                    subpattern += "(";
+                    optionalCount++;
+                }
+                if (hasWrittenComponent) {
+                    subpattern += ts.directorySeparator;
+                }
+                if (usage !== "exclude") {
+                    var componentPattern = "";
+                    // The * and ? wildcards should not match directories or files that start with . if they
+                    // appear first in a component. Dotted directories and files can be included explicitly
+                    // like so: **/.*/.*
+                    if (component.charCodeAt(0) === 42 /* asterisk */) {
+                        componentPattern += "([^./]" + singleAsteriskRegexFragment + ")?";
+                        component = component.substr(1);
+                    }
+                    else if (component.charCodeAt(0) === 63 /* question */) {
+                        componentPattern += "[^./]";
+                        component = component.substr(1);
+                    }
+                    componentPattern += component.replace(reservedCharacterPattern, replaceWildcardCharacter);
+                    // Patterns should not include subfolders like node_modules unless they are
+                    // explicitly included as part of the path.
+                    //
+                    // As an optimization, if the component pattern is the same as the component,
+                    // then there definitely were no wildcard characters and we do not need to
+                    // add the exclusion pattern.
+                    if (componentPattern !== component) {
+                        subpattern += implicitExcludePathRegexPattern;
+                    }
+                    subpattern += componentPattern;
+                }
+                else {
+                    subpattern += component.replace(reservedCharacterPattern, replaceWildcardCharacter);
+                }
+            }
+            hasWrittenComponent = true;
+        }
+        while (optionalCount > 0) {
+            subpattern += ")?";
+            optionalCount--;
+        }
+        return subpattern;
+    }
+    function replaceWildcardCharacter(match, singleAsteriskRegexFragment) {
+        return match === "*" ? singleAsteriskRegexFragment : match === "?" ? "[^/]" : "\\" + match;
+    }
+    /** @param path directory of the tsconfig.json */
+    function getFileMatcherPatterns(path, excludes, includes, useCaseSensitiveFileNames, currentDirectory) {
+        path = normalizePath(path);
+        currentDirectory = normalizePath(currentDirectory);
+        var absolutePath = combinePaths(currentDirectory, path);
+        return {
+            includeFilePatterns: ts.map(getRegularExpressionsForWildcards(includes, absolutePath, "files"), function (pattern) { return "^" + pattern + "$"; }),
+            includeFilePattern: getRegularExpressionForWildcard(includes, absolutePath, "files"),
+            includeDirectoryPattern: getRegularExpressionForWildcard(includes, absolutePath, "directories"),
+            excludePattern: getRegularExpressionForWildcard(excludes, absolutePath, "exclude"),
+            basePaths: getBasePaths(path, includes, useCaseSensitiveFileNames)
+        };
+    }
+    ts.getFileMatcherPatterns = getFileMatcherPatterns;
+    function getRegexFromPattern(pattern, useCaseSensitiveFileNames) {
+        return new RegExp(pattern, useCaseSensitiveFileNames ? "" : "i");
+    }
+    ts.getRegexFromPattern = getRegexFromPattern;
+    /** @param path directory of the tsconfig.json */
+    function matchFiles(path, extensions, excludes, includes, useCaseSensitiveFileNames, currentDirectory, depth, getFileSystemEntries) {
+        path = normalizePath(path);
+        currentDirectory = normalizePath(currentDirectory);
+        var patterns = getFileMatcherPatterns(path, excludes, includes, useCaseSensitiveFileNames, currentDirectory);
+        var includeFileRegexes = patterns.includeFilePatterns && patterns.includeFilePatterns.map(function (pattern) { return getRegexFromPattern(pattern, useCaseSensitiveFileNames); });
+        var includeDirectoryRegex = patterns.includeDirectoryPattern && getRegexFromPattern(patterns.includeDirectoryPattern, useCaseSensitiveFileNames);
+        var excludeRegex = patterns.excludePattern && getRegexFromPattern(patterns.excludePattern, useCaseSensitiveFileNames);
+        // Associate an array of results with each include regex. This keeps results in order of the "include" order.
+        // If there are no "includes", then just put everything in results[0].
+        var results = includeFileRegexes ? includeFileRegexes.map(function () { return []; }) : [[]];
+        for (var _i = 0, _a = patterns.basePaths; _i < _a.length; _i++) {
+            var basePath = _a[_i];
+            visitDirectory(basePath, combinePaths(currentDirectory, basePath), depth);
+        }
+        return ts.flatten(results);
+        function visitDirectory(path, absolutePath, depth) {
+            var _a = getFileSystemEntries(path), files = _a.files, directories = _a.directories;
+            var _loop_1 = function (current) {
+                var name = combinePaths(path, current);
+                var absoluteName = combinePaths(absolutePath, current);
+                if (extensions && !ts.fileExtensionIsOneOf(name, extensions))
+                    return "continue";
+                if (excludeRegex && excludeRegex.test(absoluteName))
+                    return "continue";
+                if (!includeFileRegexes) {
+                    results[0].push(name);
+                }
+                else {
+                    var includeIndex = ts.findIndex(includeFileRegexes, function (re) { return re.test(absoluteName); });
+                    if (includeIndex !== -1) {
+                        results[includeIndex].push(name);
+                    }
+                }
+            };
+            for (var _i = 0, _b = ts.sort(files, ts.compareStringsCaseSensitive); _i < _b.length; _i++) {
+                var current = _b[_i];
+                _loop_1(current);
+            }
+            if (depth !== undefined) {
+                depth--;
+                if (depth === 0) {
+                    return;
+                }
+            }
+            for (var _c = 0, _d = ts.sort(directories, ts.compareStringsCaseSensitive); _c < _d.length; _c++) {
+                var current = _d[_c];
+                var name = combinePaths(path, current);
+                var absoluteName = combinePaths(absolutePath, current);
+                if ((!includeDirectoryRegex || includeDirectoryRegex.test(absoluteName)) &&
+                    (!excludeRegex || !excludeRegex.test(absoluteName))) {
+                    visitDirectory(name, absoluteName, depth);
+                }
+            }
+        }
+    }
+    ts.matchFiles = matchFiles;
+    /**
+     * Computes the unique non-wildcard base paths amongst the provided include patterns.
+     */
+    function getBasePaths(path, includes, useCaseSensitiveFileNames) {
+        // Storage for our results in the form of literal paths (e.g. the paths as written by the user).
+        var basePaths = [path];
+        if (includes) {
+            // Storage for literal base paths amongst the include patterns.
+            var includeBasePaths = [];
+            for (var _i = 0, includes_1 = includes; _i < includes_1.length; _i++) {
+                var include = includes_1[_i];
+                // We also need to check the relative paths by converting them to absolute and normalizing
+                // in case they escape the base path (e.g "..\somedirectory")
+                var absolute = isRootedDiskPath(include) ? include : normalizePath(combinePaths(path, include));
+                // Append the literal and canonical candidate base paths.
+                includeBasePaths.push(getIncludeBasePath(absolute));
+            }
+            // Sort the offsets array using either the literal or canonical path representations.
+            includeBasePaths.sort(ts.getStringComparer(!useCaseSensitiveFileNames));
+            var _loop_2 = function (includeBasePath) {
+                if (ts.every(basePaths, function (basePath) { return !containsPath(basePath, includeBasePath, path, !useCaseSensitiveFileNames); })) {
+                    basePaths.push(includeBasePath);
+                }
+            };
+            // Iterate over each include base path and include unique base paths that are not a
+            // subpath of an existing base path
+            for (var _a = 0, includeBasePaths_1 = includeBasePaths; _a < includeBasePaths_1.length; _a++) {
+                var includeBasePath = includeBasePaths_1[_a];
+                _loop_2(includeBasePath);
+            }
+        }
+        return basePaths;
+    }
+    function getIncludeBasePath(absolute) {
+        var wildcardOffset = ts.indexOfAnyCharCode(absolute, wildcardCharCodes);
+        if (wildcardOffset < 0) {
+            // No "*" or "?" in the path
+            return !hasExtension(absolute)
+                ? absolute
+                : removeTrailingDirectorySeparator(getDirectoryPath(absolute));
+        }
+        return absolute.substring(0, absolute.lastIndexOf(ts.directorySeparator, wildcardOffset));
+    }
+    function ensureScriptKind(fileName, scriptKind) {
+        // Using scriptKind as a condition handles both:
+        // - 'scriptKind' is unspecified and thus it is `undefined`
+        // - 'scriptKind' is set and it is `Unknown` (0)
+        // If the 'scriptKind' is 'undefined' or 'Unknown' then we attempt
+        // to get the ScriptKind from the file name. If it cannot be resolved
+        // from the file name then the default 'TS' script kind is returned.
+        return scriptKind || getScriptKindFromFileName(fileName) || 3 /* TS */;
+    }
+    ts.ensureScriptKind = ensureScriptKind;
+    function getScriptKindFromFileName(fileName) {
+        var ext = fileName.substr(fileName.lastIndexOf("."));
+        switch (ext.toLowerCase()) {
+            case ".js" /* Js */:
+                return 1 /* JS */;
+            case ".jsx" /* Jsx */:
+                return 2 /* JSX */;
+            case ".ts" /* Ts */:
+                return 3 /* TS */;
+            case ".tsx" /* Tsx */:
+                return 4 /* TSX */;
+            case ".json" /* Json */:
+                return 6 /* JSON */;
+            default:
+                return 0 /* Unknown */;
+        }
+    }
+    ts.getScriptKindFromFileName = getScriptKindFromFileName;
+    /**
+     *  List of supported extensions in order of file resolution precedence.
+     */
+    ts.supportedTypeScriptExtensions = [".ts" /* Ts */, ".tsx" /* Tsx */, ".d.ts" /* Dts */];
+    /** Must have ".d.ts" first because if ".ts" goes first, that will be detected as the extension instead of ".d.ts". */
+    ts.supportedTypescriptExtensionsForExtractExtension = [".d.ts" /* Dts */, ".ts" /* Ts */, ".tsx" /* Tsx */];
+    ts.supportedJavascriptExtensions = [".js" /* Js */, ".jsx" /* Jsx */];
+    var allSupportedExtensions = ts.supportedTypeScriptExtensions.concat(ts.supportedJavascriptExtensions);
+    function getSupportedExtensions(options, extraFileExtensions) {
+        var needJsExtensions = options && options.allowJs;
+        if (!extraFileExtensions || extraFileExtensions.length === 0) {
+            return needJsExtensions ? allSupportedExtensions : ts.supportedTypeScriptExtensions;
+        }
+        var extensions = (needJsExtensions ? allSupportedExtensions : ts.supportedTypeScriptExtensions).concat(ts.mapDefined(extraFileExtensions, function (x) { return x.scriptKind === 7 /* Deferred */ || needJsExtensions && isJavaScriptLike(x.scriptKind) ? x.extension : undefined; }));
+        return ts.deduplicate(extensions, ts.equateStringsCaseSensitive, ts.compareStringsCaseSensitive);
+    }
+    ts.getSupportedExtensions = getSupportedExtensions;
+    function isJavaScriptLike(scriptKind) {
+        return scriptKind === 1 /* JS */ || scriptKind === 2 /* JSX */;
+    }
+    function hasJavaScriptFileExtension(fileName) {
+        return ts.some(ts.supportedJavascriptExtensions, function (extension) { return ts.fileExtensionIs(fileName, extension); });
+    }
+    ts.hasJavaScriptFileExtension = hasJavaScriptFileExtension;
+    function hasTypeScriptFileExtension(fileName) {
+        return ts.some(ts.supportedTypeScriptExtensions, function (extension) { return ts.fileExtensionIs(fileName, extension); });
+    }
+    ts.hasTypeScriptFileExtension = hasTypeScriptFileExtension;
+    function isSupportedSourceFileName(fileName, compilerOptions, extraFileExtensions) {
+        if (!fileName) {
+            return false;
+        }
+        for (var _i = 0, _a = getSupportedExtensions(compilerOptions, extraFileExtensions); _i < _a.length; _i++) {
+            var extension = _a[_i];
+            if (ts.fileExtensionIs(fileName, extension)) {
+                return true;
+            }
+        }
+        return false;
+    }
+    ts.isSupportedSourceFileName = isSupportedSourceFileName;
+    /**
+     * Extension boundaries by priority. Lower numbers indicate higher priorities, and are
+     * aligned to the offset of the highest priority extension in the
+     * allSupportedExtensions array.
+     */
+    var ExtensionPriority;
+    (function (ExtensionPriority) {
+        ExtensionPriority[ExtensionPriority["TypeScriptFiles"] = 0] = "TypeScriptFiles";
+        ExtensionPriority[ExtensionPriority["DeclarationAndJavaScriptFiles"] = 2] = "DeclarationAndJavaScriptFiles";
+        ExtensionPriority[ExtensionPriority["Highest"] = 0] = "Highest";
+        ExtensionPriority[ExtensionPriority["Lowest"] = 2] = "Lowest";
+    })(ExtensionPriority = ts.ExtensionPriority || (ts.ExtensionPriority = {}));
+    function getExtensionPriority(path, supportedExtensions) {
+        for (var i = supportedExtensions.length - 1; i >= 0; i--) {
+            if (ts.fileExtensionIs(path, supportedExtensions[i])) {
+                return adjustExtensionPriority(i, supportedExtensions);
+            }
+        }
+        // If its not in the list of supported extensions, this is likely a
+        // TypeScript file with a non-ts extension
+        return 0 /* Highest */;
+    }
+    ts.getExtensionPriority = getExtensionPriority;
+    /**
+     * Adjusts an extension priority to be the highest priority within the same range.
+     */
+    function adjustExtensionPriority(extensionPriority, supportedExtensions) {
+        if (extensionPriority < 2 /* DeclarationAndJavaScriptFiles */) {
+            return 0 /* TypeScriptFiles */;
+        }
+        else if (extensionPriority < supportedExtensions.length) {
+            return 2 /* DeclarationAndJavaScriptFiles */;
+        }
+        else {
+            return supportedExtensions.length;
+        }
+    }
+    ts.adjustExtensionPriority = adjustExtensionPriority;
+    /**
+     * Gets the next lowest extension priority for a given priority.
+     */
+    function getNextLowestExtensionPriority(extensionPriority, supportedExtensions) {
+        if (extensionPriority < 2 /* DeclarationAndJavaScriptFiles */) {
+            return 2 /* DeclarationAndJavaScriptFiles */;
+        }
+        else {
+            return supportedExtensions.length;
+        }
+    }
+    ts.getNextLowestExtensionPriority = getNextLowestExtensionPriority;
+    var extensionsToRemove = [".d.ts" /* Dts */, ".ts" /* Ts */, ".js" /* Js */, ".tsx" /* Tsx */, ".jsx" /* Jsx */, ".json" /* Json */];
+    function removeFileExtension(path) {
+        for (var _i = 0, extensionsToRemove_1 = extensionsToRemove; _i < extensionsToRemove_1.length; _i++) {
+            var ext = extensionsToRemove_1[_i];
+            var extensionless = tryRemoveExtension(path, ext);
+            if (extensionless !== undefined) {
+                return extensionless;
+            }
+        }
+        return path;
+    }
+    ts.removeFileExtension = removeFileExtension;
+    function tryRemoveExtension(path, extension) {
+        return ts.fileExtensionIs(path, extension) ? removeExtension(path, extension) : undefined;
+    }
+    ts.tryRemoveExtension = tryRemoveExtension;
+    function removeExtension(path, extension) {
+        return path.substring(0, path.length - extension.length);
+    }
+    ts.removeExtension = removeExtension;
+    function changeExtension(path, newExtension) {
+        return changeAnyExtension(path, newExtension, extensionsToRemove, /*ignoreCase*/ false);
+    }
+    ts.changeExtension = changeExtension;
+    function changeAnyExtension(path, ext, extensions, ignoreCase) {
+        var pathext = extensions !== undefined && ignoreCase !== undefined ? getAnyExtensionFromPath(path, extensions, ignoreCase) : getAnyExtensionFromPath(path);
+        return pathext ? path.slice(0, path.length - pathext.length) + (ts.startsWith(ext, ".") ? ext : "." + ext) : path;
+    }
+    ts.changeAnyExtension = changeAnyExtension;
+    var Debug;
+    (function (Debug) {
+        function showSymbol(symbol) {
+            var symbolFlags = ts.SymbolFlags;
+            return "{ flags: " + (symbolFlags ? showFlags(symbol.flags, symbolFlags) : symbol.flags) + "; declarations: " + ts.map(symbol.declarations, showSyntaxKind) + " }";
+        }
+        Debug.showSymbol = showSymbol;
+        function showFlags(flags, flagsEnum) {
+            var out = [];
+            for (var pow = 0; pow <= 30; pow++) {
+                var n = 1 << pow;
+                if (flags & n) {
+                    out.push(flagsEnum[n]);
+                }
+            }
+            return out.join("|");
+        }
+        function showSyntaxKind(node) {
+            var syntaxKind = ts.SyntaxKind;
+            return syntaxKind ? syntaxKind[node.kind] : node.kind.toString();
+        }
+        Debug.showSyntaxKind = showSyntaxKind;
+    })(Debug = ts.Debug || (ts.Debug = {}));
+    function tryParsePattern(pattern) {
+        // This should be verified outside of here and a proper error thrown.
+        Debug.assert(hasZeroOrOneAsteriskCharacter(pattern));
+        var indexOfStar = pattern.indexOf("*");
+        return indexOfStar === -1 ? undefined : {
+            prefix: pattern.substr(0, indexOfStar),
+            suffix: pattern.substr(indexOfStar + 1)
+        };
+    }
+    ts.tryParsePattern = tryParsePattern;
+    function positionIsSynthesized(pos) {
+        // This is a fast way of testing the following conditions:
+        //  pos === undefined || pos === null || isNaN(pos) || pos < 0;
+        return !(pos >= 0);
+    }
+    ts.positionIsSynthesized = positionIsSynthesized;
+    /** True if an extension is one of the supported TypeScript extensions. */
+    function extensionIsTypeScript(ext) {
+        return ext === ".ts" /* Ts */ || ext === ".tsx" /* Tsx */ || ext === ".d.ts" /* Dts */;
+    }
+    ts.extensionIsTypeScript = extensionIsTypeScript;
+    function resolutionExtensionIsTypeScriptOrJson(ext) {
+        return extensionIsTypeScript(ext) || ext === ".json" /* Json */;
+    }
+    ts.resolutionExtensionIsTypeScriptOrJson = resolutionExtensionIsTypeScriptOrJson;
+    /**
+     * Gets the extension from a path.
+     * Path must have a valid extension.
+     */
+    function extensionFromPath(path) {
+        var ext = tryGetExtensionFromPath(path);
+        return ext !== undefined ? ext : Debug.fail("File " + path + " has unknown extension.");
+    }
+    ts.extensionFromPath = extensionFromPath;
+    function isAnySupportedFileExtension(path) {
+        return tryGetExtensionFromPath(path) !== undefined;
+    }
+    ts.isAnySupportedFileExtension = isAnySupportedFileExtension;
+    function tryGetExtensionFromPath(path) {
+        return ts.find(ts.supportedTypescriptExtensionsForExtractExtension, function (e) { return ts.fileExtensionIs(path, e); }) || ts.find(ts.supportedJavascriptExtensions, function (e) { return ts.fileExtensionIs(path, e); });
+    }
+    ts.tryGetExtensionFromPath = tryGetExtensionFromPath;
+    function getAnyExtensionFromPathWorker(path, extensions, stringEqualityComparer) {
+        if (typeof extensions === "string")
+            extensions = [extensions];
+        for (var _i = 0, extensions_1 = extensions; _i < extensions_1.length; _i++) {
+            var extension = extensions_1[_i];
+            if (!ts.startsWith(extension, "."))
+                extension = "." + extension;
+            if (path.length >= extension.length && path.charAt(path.length - extension.length) === ".") {
+                var pathExtension = path.slice(path.length - extension.length);
+                if (stringEqualityComparer(pathExtension, extension)) {
+                    return pathExtension;
+                }
+            }
+        }
+        return "";
+    }
+    function getAnyExtensionFromPath(path, extensions, ignoreCase) {
+        // Retrieves any string from the final "." onwards from a base file name.
+        // Unlike extensionFromPath, which throws an exception on unrecognized extensions.
+        if (extensions) {
+            return getAnyExtensionFromPathWorker(path, extensions, ignoreCase ? ts.equateStringsCaseInsensitive : ts.equateStringsCaseSensitive);
+        }
+        var baseFileName = getBaseFileName(path);
+        var extensionIndex = baseFileName.lastIndexOf(".");
+        if (extensionIndex >= 0) {
+            return baseFileName.substring(extensionIndex);
+        }
+        return "";
+    }
+    ts.getAnyExtensionFromPath = getAnyExtensionFromPath;
+    function isCheckJsEnabledForFile(sourceFile, compilerOptions) {
+        return sourceFile.checkJsDirective ? sourceFile.checkJsDirective.enabled : compilerOptions.checkJs;
+    }
+    ts.isCheckJsEnabledForFile = isCheckJsEnabledForFile;
+    ts.emptyFileSystemEntries = {
+        files: ts.emptyArray,
+        directories: ts.emptyArray
+    };
+    /**
+     * patternStrings contains both pattern strings (containing "*") and regular strings.
+     * Return an exact match if possible, or a pattern match, or undefined.
+     * (These are verified by verifyCompilerOptions to have 0 or 1 "*" characters.)
+     */
+    function matchPatternOrExact(patternStrings, candidate) {
+        var patterns = [];
+        for (var _i = 0, patternStrings_1 = patternStrings; _i < patternStrings_1.length; _i++) {
+            var patternString = patternStrings_1[_i];
+            var pattern = tryParsePattern(patternString);
+            if (pattern) {
+                patterns.push(pattern);
+            }
+            else if (patternString === candidate) {
+                // pattern was matched as is - no need to search further
+                return patternString;
+            }
+        }
+        return ts.findBestPatternMatch(patterns, function (_) { return _; }, candidate);
+    }
+    ts.matchPatternOrExact = matchPatternOrExact;
 })(ts || (ts = {}));
 var ts;
 (function (ts) {
+    var SignatureFlags;
+    (function (SignatureFlags) {
+        SignatureFlags[SignatureFlags["None"] = 0] = "None";
+        SignatureFlags[SignatureFlags["Yield"] = 1] = "Yield";
+        SignatureFlags[SignatureFlags["Await"] = 2] = "Await";
+        SignatureFlags[SignatureFlags["Type"] = 4] = "Type";
+        SignatureFlags[SignatureFlags["IgnoreMissingOpenBrace"] = 16] = "IgnoreMissingOpenBrace";
+        SignatureFlags[SignatureFlags["JSDoc"] = 32] = "JSDoc";
+    })(SignatureFlags || (SignatureFlags = {}));
+    // tslint:disable variable-name
     var NodeConstructor;
     var TokenConstructor;
     var IdentifierConstructor;
     var SourceFileConstructor;
+    // tslint:enable variable-name
     function createNode(kind, pos, end) {
-        if (kind === 274) {
+        if (kind === 274 /* SourceFile */) {
             return new (SourceFileConstructor || (SourceFileConstructor = ts.objectAllocator.getSourceFileConstructor()))(kind, pos, end);
         }
-        else if (kind === 71) {
+        else if (kind === 71 /* Identifier */) {
             return new (IdentifierConstructor || (IdentifierConstructor = ts.objectAllocator.getIdentifierConstructor()))(kind, pos, end);
         }
         else if (!ts.isNodeKind(kind)) {
@@ -11829,35 +14978,49 @@ var ts;
             }
         }
     }
+    /*@internal*/
     function isJSDocLikeText(text, start) {
-        return text.charCodeAt(start + 1) === 42 &&
-            text.charCodeAt(start + 2) === 42 &&
-            text.charCodeAt(start + 3) !== 47;
+        return text.charCodeAt(start + 1) === 42 /* asterisk */ &&
+            text.charCodeAt(start + 2) === 42 /* asterisk */ &&
+            text.charCodeAt(start + 3) !== 47 /* slash */;
     }
     ts.isJSDocLikeText = isJSDocLikeText;
+    /**
+     * Invokes a callback for each child of the given node. The 'cbNode' callback is invoked for all child nodes
+     * stored in properties. If a 'cbNodes' callback is specified, it is invoked for embedded arrays; otherwise,
+     * embedded arrays are flattened and the 'cbNode' callback is invoked for each element. If a callback returns
+     * a truthy value, iteration stops and that value is returned. Otherwise, undefined is returned.
+     *
+     * @param node a given node to visit its children
+     * @param cbNode a callback to be invoked for all child nodes
+     * @param cbNodes a callback to be invoked for embedded array
+     *
+     * @remarks `forEachChild` must visit the children of a node in the order
+     * that they appear in the source code. The language service depends on this property to locate nodes by position.
+     */
     function forEachChild(node, cbNode, cbNodes) {
-        if (!node || node.kind <= 145) {
+        if (!node || node.kind <= 145 /* LastToken */) {
             return;
         }
         switch (node.kind) {
-            case 146:
+            case 146 /* QualifiedName */:
                 return visitNode(cbNode, node.left) ||
                     visitNode(cbNode, node.right);
-            case 148:
+            case 148 /* TypeParameter */:
                 return visitNode(cbNode, node.name) ||
                     visitNode(cbNode, node.constraint) ||
                     visitNode(cbNode, node.default) ||
                     visitNode(cbNode, node.expression);
-            case 271:
+            case 271 /* ShorthandPropertyAssignment */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.name) ||
                     visitNode(cbNode, node.questionToken) ||
                     visitNode(cbNode, node.equalsToken) ||
                     visitNode(cbNode, node.objectAssignmentInitializer);
-            case 272:
+            case 272 /* SpreadAssignment */:
                 return visitNode(cbNode, node.expression);
-            case 149:
+            case 149 /* Parameter */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.dotDotDotToken) ||
@@ -11865,7 +15028,7 @@ var ts;
                     visitNode(cbNode, node.questionToken) ||
                     visitNode(cbNode, node.type) ||
                     visitNode(cbNode, node.initializer);
-            case 152:
+            case 152 /* PropertyDeclaration */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.name) ||
@@ -11873,51 +15036,51 @@ var ts;
                     visitNode(cbNode, node.exclamationToken) ||
                     visitNode(cbNode, node.type) ||
                     visitNode(cbNode, node.initializer);
-            case 151:
+            case 151 /* PropertySignature */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.name) ||
                     visitNode(cbNode, node.questionToken) ||
                     visitNode(cbNode, node.type) ||
                     visitNode(cbNode, node.initializer);
-            case 270:
+            case 270 /* PropertyAssignment */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.name) ||
                     visitNode(cbNode, node.questionToken) ||
                     visitNode(cbNode, node.initializer);
-            case 232:
+            case 232 /* VariableDeclaration */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.name) ||
                     visitNode(cbNode, node.exclamationToken) ||
                     visitNode(cbNode, node.type) ||
                     visitNode(cbNode, node.initializer);
-            case 182:
+            case 182 /* BindingElement */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.dotDotDotToken) ||
                     visitNode(cbNode, node.propertyName) ||
                     visitNode(cbNode, node.name) ||
                     visitNode(cbNode, node.initializer);
-            case 163:
-            case 164:
-            case 158:
-            case 159:
-            case 160:
+            case 163 /* FunctionType */:
+            case 164 /* ConstructorType */:
+            case 158 /* CallSignature */:
+            case 159 /* ConstructSignature */:
+            case 160 /* IndexSignature */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNodes(cbNode, cbNodes, node.typeParameters) ||
                     visitNodes(cbNode, cbNodes, node.parameters) ||
                     visitNode(cbNode, node.type);
-            case 154:
-            case 153:
-            case 155:
-            case 156:
-            case 157:
-            case 192:
-            case 234:
-            case 193:
+            case 154 /* MethodDeclaration */:
+            case 153 /* MethodSignature */:
+            case 155 /* Constructor */:
+            case 156 /* GetAccessor */:
+            case 157 /* SetAccessor */:
+            case 192 /* FunctionExpression */:
+            case 234 /* FunctionDeclaration */:
+            case 193 /* ArrowFunction */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.asteriskToken) ||
@@ -11928,304 +15091,304 @@ var ts;
                     visitNode(cbNode, node.type) ||
                     visitNode(cbNode, node.equalsGreaterThanToken) ||
                     visitNode(cbNode, node.body);
-            case 162:
+            case 162 /* TypeReference */:
                 return visitNode(cbNode, node.typeName) ||
                     visitNodes(cbNode, cbNodes, node.typeArguments);
-            case 161:
+            case 161 /* TypePredicate */:
                 return visitNode(cbNode, node.parameterName) ||
                     visitNode(cbNode, node.type);
-            case 165:
+            case 165 /* TypeQuery */:
                 return visitNode(cbNode, node.exprName);
-            case 166:
+            case 166 /* TypeLiteral */:
                 return visitNodes(cbNode, cbNodes, node.members);
-            case 167:
+            case 167 /* ArrayType */:
                 return visitNode(cbNode, node.elementType);
-            case 168:
+            case 168 /* TupleType */:
                 return visitNodes(cbNode, cbNodes, node.elementTypes);
-            case 169:
-            case 170:
+            case 169 /* UnionType */:
+            case 170 /* IntersectionType */:
                 return visitNodes(cbNode, cbNodes, node.types);
-            case 171:
+            case 171 /* ConditionalType */:
                 return visitNode(cbNode, node.checkType) ||
                     visitNode(cbNode, node.extendsType) ||
                     visitNode(cbNode, node.trueType) ||
                     visitNode(cbNode, node.falseType);
-            case 172:
+            case 172 /* InferType */:
                 return visitNode(cbNode, node.typeParameter);
-            case 179:
+            case 179 /* ImportType */:
                 return visitNode(cbNode, node.argument) ||
                     visitNode(cbNode, node.qualifier) ||
                     visitNodes(cbNode, cbNodes, node.typeArguments);
-            case 173:
-            case 175:
+            case 173 /* ParenthesizedType */:
+            case 175 /* TypeOperator */:
                 return visitNode(cbNode, node.type);
-            case 176:
+            case 176 /* IndexedAccessType */:
                 return visitNode(cbNode, node.objectType) ||
                     visitNode(cbNode, node.indexType);
-            case 177:
+            case 177 /* MappedType */:
                 return visitNode(cbNode, node.readonlyToken) ||
                     visitNode(cbNode, node.typeParameter) ||
                     visitNode(cbNode, node.questionToken) ||
                     visitNode(cbNode, node.type);
-            case 178:
+            case 178 /* LiteralType */:
                 return visitNode(cbNode, node.literal);
-            case 180:
-            case 181:
+            case 180 /* ObjectBindingPattern */:
+            case 181 /* ArrayBindingPattern */:
                 return visitNodes(cbNode, cbNodes, node.elements);
-            case 183:
+            case 183 /* ArrayLiteralExpression */:
                 return visitNodes(cbNode, cbNodes, node.elements);
-            case 184:
+            case 184 /* ObjectLiteralExpression */:
                 return visitNodes(cbNode, cbNodes, node.properties);
-            case 185:
+            case 185 /* PropertyAccessExpression */:
                 return visitNode(cbNode, node.expression) ||
                     visitNode(cbNode, node.name);
-            case 186:
+            case 186 /* ElementAccessExpression */:
                 return visitNode(cbNode, node.expression) ||
                     visitNode(cbNode, node.argumentExpression);
-            case 187:
-            case 188:
+            case 187 /* CallExpression */:
+            case 188 /* NewExpression */:
                 return visitNode(cbNode, node.expression) ||
                     visitNodes(cbNode, cbNodes, node.typeArguments) ||
                     visitNodes(cbNode, cbNodes, node.arguments);
-            case 189:
+            case 189 /* TaggedTemplateExpression */:
                 return visitNode(cbNode, node.tag) ||
                     visitNodes(cbNode, cbNodes, node.typeArguments) ||
                     visitNode(cbNode, node.template);
-            case 190:
+            case 190 /* TypeAssertionExpression */:
                 return visitNode(cbNode, node.type) ||
                     visitNode(cbNode, node.expression);
-            case 191:
+            case 191 /* ParenthesizedExpression */:
                 return visitNode(cbNode, node.expression);
-            case 194:
+            case 194 /* DeleteExpression */:
                 return visitNode(cbNode, node.expression);
-            case 195:
+            case 195 /* TypeOfExpression */:
                 return visitNode(cbNode, node.expression);
-            case 196:
+            case 196 /* VoidExpression */:
                 return visitNode(cbNode, node.expression);
-            case 198:
+            case 198 /* PrefixUnaryExpression */:
                 return visitNode(cbNode, node.operand);
-            case 203:
+            case 203 /* YieldExpression */:
                 return visitNode(cbNode, node.asteriskToken) ||
                     visitNode(cbNode, node.expression);
-            case 197:
+            case 197 /* AwaitExpression */:
                 return visitNode(cbNode, node.expression);
-            case 199:
+            case 199 /* PostfixUnaryExpression */:
                 return visitNode(cbNode, node.operand);
-            case 200:
+            case 200 /* BinaryExpression */:
                 return visitNode(cbNode, node.left) ||
                     visitNode(cbNode, node.operatorToken) ||
                     visitNode(cbNode, node.right);
-            case 208:
+            case 208 /* AsExpression */:
                 return visitNode(cbNode, node.expression) ||
                     visitNode(cbNode, node.type);
-            case 209:
+            case 209 /* NonNullExpression */:
                 return visitNode(cbNode, node.expression);
-            case 210:
+            case 210 /* MetaProperty */:
                 return visitNode(cbNode, node.name);
-            case 201:
+            case 201 /* ConditionalExpression */:
                 return visitNode(cbNode, node.condition) ||
                     visitNode(cbNode, node.questionToken) ||
                     visitNode(cbNode, node.whenTrue) ||
                     visitNode(cbNode, node.colonToken) ||
                     visitNode(cbNode, node.whenFalse);
-            case 204:
+            case 204 /* SpreadElement */:
                 return visitNode(cbNode, node.expression);
-            case 213:
-            case 240:
+            case 213 /* Block */:
+            case 240 /* ModuleBlock */:
                 return visitNodes(cbNode, cbNodes, node.statements);
-            case 274:
+            case 274 /* SourceFile */:
                 return visitNodes(cbNode, cbNodes, node.statements) ||
                     visitNode(cbNode, node.endOfFileToken);
-            case 214:
+            case 214 /* VariableStatement */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.declarationList);
-            case 233:
+            case 233 /* VariableDeclarationList */:
                 return visitNodes(cbNode, cbNodes, node.declarations);
-            case 216:
+            case 216 /* ExpressionStatement */:
                 return visitNode(cbNode, node.expression);
-            case 217:
+            case 217 /* IfStatement */:
                 return visitNode(cbNode, node.expression) ||
                     visitNode(cbNode, node.thenStatement) ||
                     visitNode(cbNode, node.elseStatement);
-            case 218:
+            case 218 /* DoStatement */:
                 return visitNode(cbNode, node.statement) ||
                     visitNode(cbNode, node.expression);
-            case 219:
+            case 219 /* WhileStatement */:
                 return visitNode(cbNode, node.expression) ||
                     visitNode(cbNode, node.statement);
-            case 220:
+            case 220 /* ForStatement */:
                 return visitNode(cbNode, node.initializer) ||
                     visitNode(cbNode, node.condition) ||
                     visitNode(cbNode, node.incrementor) ||
                     visitNode(cbNode, node.statement);
-            case 221:
+            case 221 /* ForInStatement */:
                 return visitNode(cbNode, node.initializer) ||
                     visitNode(cbNode, node.expression) ||
                     visitNode(cbNode, node.statement);
-            case 222:
+            case 222 /* ForOfStatement */:
                 return visitNode(cbNode, node.awaitModifier) ||
                     visitNode(cbNode, node.initializer) ||
                     visitNode(cbNode, node.expression) ||
                     visitNode(cbNode, node.statement);
-            case 223:
-            case 224:
+            case 223 /* ContinueStatement */:
+            case 224 /* BreakStatement */:
                 return visitNode(cbNode, node.label);
-            case 225:
+            case 225 /* ReturnStatement */:
                 return visitNode(cbNode, node.expression);
-            case 226:
+            case 226 /* WithStatement */:
                 return visitNode(cbNode, node.expression) ||
                     visitNode(cbNode, node.statement);
-            case 227:
+            case 227 /* SwitchStatement */:
                 return visitNode(cbNode, node.expression) ||
                     visitNode(cbNode, node.caseBlock);
-            case 241:
+            case 241 /* CaseBlock */:
                 return visitNodes(cbNode, cbNodes, node.clauses);
-            case 266:
+            case 266 /* CaseClause */:
                 return visitNode(cbNode, node.expression) ||
                     visitNodes(cbNode, cbNodes, node.statements);
-            case 267:
+            case 267 /* DefaultClause */:
                 return visitNodes(cbNode, cbNodes, node.statements);
-            case 228:
+            case 228 /* LabeledStatement */:
                 return visitNode(cbNode, node.label) ||
                     visitNode(cbNode, node.statement);
-            case 229:
+            case 229 /* ThrowStatement */:
                 return visitNode(cbNode, node.expression);
-            case 230:
+            case 230 /* TryStatement */:
                 return visitNode(cbNode, node.tryBlock) ||
                     visitNode(cbNode, node.catchClause) ||
                     visitNode(cbNode, node.finallyBlock);
-            case 269:
+            case 269 /* CatchClause */:
                 return visitNode(cbNode, node.variableDeclaration) ||
                     visitNode(cbNode, node.block);
-            case 150:
+            case 150 /* Decorator */:
                 return visitNode(cbNode, node.expression);
-            case 235:
-            case 205:
+            case 235 /* ClassDeclaration */:
+            case 205 /* ClassExpression */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.name) ||
                     visitNodes(cbNode, cbNodes, node.typeParameters) ||
                     visitNodes(cbNode, cbNodes, node.heritageClauses) ||
                     visitNodes(cbNode, cbNodes, node.members);
-            case 236:
+            case 236 /* InterfaceDeclaration */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.name) ||
                     visitNodes(cbNode, cbNodes, node.typeParameters) ||
                     visitNodes(cbNode, cbNodes, node.heritageClauses) ||
                     visitNodes(cbNode, cbNodes, node.members);
-            case 237:
+            case 237 /* TypeAliasDeclaration */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.name) ||
                     visitNodes(cbNode, cbNodes, node.typeParameters) ||
                     visitNode(cbNode, node.type);
-            case 238:
+            case 238 /* EnumDeclaration */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.name) ||
                     visitNodes(cbNode, cbNodes, node.members);
-            case 273:
+            case 273 /* EnumMember */:
                 return visitNode(cbNode, node.name) ||
                     visitNode(cbNode, node.initializer);
-            case 239:
+            case 239 /* ModuleDeclaration */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.name) ||
                     visitNode(cbNode, node.body);
-            case 243:
+            case 243 /* ImportEqualsDeclaration */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.name) ||
                     visitNode(cbNode, node.moduleReference);
-            case 244:
+            case 244 /* ImportDeclaration */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.importClause) ||
                     visitNode(cbNode, node.moduleSpecifier);
-            case 245:
+            case 245 /* ImportClause */:
                 return visitNode(cbNode, node.name) ||
                     visitNode(cbNode, node.namedBindings);
-            case 242:
+            case 242 /* NamespaceExportDeclaration */:
                 return visitNode(cbNode, node.name);
-            case 246:
+            case 246 /* NamespaceImport */:
                 return visitNode(cbNode, node.name);
-            case 247:
-            case 251:
+            case 247 /* NamedImports */:
+            case 251 /* NamedExports */:
                 return visitNodes(cbNode, cbNodes, node.elements);
-            case 250:
+            case 250 /* ExportDeclaration */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.exportClause) ||
                     visitNode(cbNode, node.moduleSpecifier);
-            case 248:
-            case 252:
+            case 248 /* ImportSpecifier */:
+            case 252 /* ExportSpecifier */:
                 return visitNode(cbNode, node.propertyName) ||
                     visitNode(cbNode, node.name);
-            case 249:
+            case 249 /* ExportAssignment */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.expression);
-            case 202:
+            case 202 /* TemplateExpression */:
                 return visitNode(cbNode, node.head) || visitNodes(cbNode, cbNodes, node.templateSpans);
-            case 211:
+            case 211 /* TemplateSpan */:
                 return visitNode(cbNode, node.expression) || visitNode(cbNode, node.literal);
-            case 147:
+            case 147 /* ComputedPropertyName */:
                 return visitNode(cbNode, node.expression);
-            case 268:
+            case 268 /* HeritageClause */:
                 return visitNodes(cbNode, cbNodes, node.types);
-            case 207:
+            case 207 /* ExpressionWithTypeArguments */:
                 return visitNode(cbNode, node.expression) ||
                     visitNodes(cbNode, cbNodes, node.typeArguments);
-            case 254:
+            case 254 /* ExternalModuleReference */:
                 return visitNode(cbNode, node.expression);
-            case 253:
+            case 253 /* MissingDeclaration */:
                 return visitNodes(cbNode, cbNodes, node.decorators);
-            case 302:
+            case 302 /* CommaListExpression */:
                 return visitNodes(cbNode, cbNodes, node.elements);
-            case 255:
+            case 255 /* JsxElement */:
                 return visitNode(cbNode, node.openingElement) ||
                     visitNodes(cbNode, cbNodes, node.children) ||
                     visitNode(cbNode, node.closingElement);
-            case 259:
+            case 259 /* JsxFragment */:
                 return visitNode(cbNode, node.openingFragment) ||
                     visitNodes(cbNode, cbNodes, node.children) ||
                     visitNode(cbNode, node.closingFragment);
-            case 256:
-            case 257:
+            case 256 /* JsxSelfClosingElement */:
+            case 257 /* JsxOpeningElement */:
                 return visitNode(cbNode, node.tagName) ||
                     visitNodes(cbNode, cbNodes, node.typeArguments) ||
                     visitNode(cbNode, node.attributes);
-            case 263:
+            case 263 /* JsxAttributes */:
                 return visitNodes(cbNode, cbNodes, node.properties);
-            case 262:
+            case 262 /* JsxAttribute */:
                 return visitNode(cbNode, node.name) ||
                     visitNode(cbNode, node.initializer);
-            case 264:
+            case 264 /* JsxSpreadAttribute */:
                 return visitNode(cbNode, node.expression);
-            case 265:
+            case 265 /* JsxExpression */:
                 return visitNode(cbNode, node.dotDotDotToken) ||
                     visitNode(cbNode, node.expression);
-            case 258:
+            case 258 /* JsxClosingElement */:
                 return visitNode(cbNode, node.tagName);
-            case 278:
+            case 278 /* JSDocTypeExpression */:
                 return visitNode(cbNode, node.type);
-            case 282:
+            case 282 /* JSDocNonNullableType */:
                 return visitNode(cbNode, node.type);
-            case 281:
+            case 281 /* JSDocNullableType */:
                 return visitNode(cbNode, node.type);
-            case 283:
+            case 283 /* JSDocOptionalType */:
                 return visitNode(cbNode, node.type);
-            case 284:
+            case 284 /* JSDocFunctionType */:
                 return visitNodes(cbNode, cbNodes, node.parameters) ||
                     visitNode(cbNode, node.type);
-            case 285:
+            case 285 /* JSDocVariadicType */:
                 return visitNode(cbNode, node.type);
-            case 286:
+            case 286 /* JSDocComment */:
                 return visitNodes(cbNode, cbNodes, node.tags);
-            case 293:
-            case 298:
+            case 293 /* JSDocParameterTag */:
+            case 298 /* JSDocPropertyTag */:
                 if (node.isNameFirst) {
                     return visitNode(cbNode, node.name) ||
                         visitNode(cbNode, node.typeExpression);
@@ -12234,17 +15397,17 @@ var ts;
                     return visitNode(cbNode, node.typeExpression) ||
                         visitNode(cbNode, node.name);
                 }
-            case 294:
+            case 294 /* JSDocReturnTag */:
                 return visitNode(cbNode, node.typeExpression);
-            case 295:
+            case 295 /* JSDocTypeTag */:
                 return visitNode(cbNode, node.typeExpression);
-            case 290:
+            case 290 /* JSDocAugmentsTag */:
                 return visitNode(cbNode, node.class);
-            case 296:
+            case 296 /* JSDocTemplateTag */:
                 return visitNodes(cbNode, cbNodes, node.typeParameters);
-            case 297:
+            case 297 /* JSDocTypedefTag */:
                 if (node.typeExpression &&
-                    node.typeExpression.kind === 278) {
+                    node.typeExpression.kind === 278 /* JSDocTypeExpression */) {
                     return visitNode(cbNode, node.typeExpression) ||
                         visitNode(cbNode, node.fullName);
                 }
@@ -12252,16 +15415,16 @@ var ts;
                     return visitNode(cbNode, node.fullName) ||
                         visitNode(cbNode, node.typeExpression);
                 }
-            case 292:
+            case 292 /* JSDocCallbackTag */:
                 return visitNode(cbNode, node.fullName) ||
                     visitNode(cbNode, node.typeExpression);
-            case 288:
+            case 288 /* JSDocSignature */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNodes(cbNode, cbNodes, node.typeParameters) ||
                     visitNodes(cbNode, cbNodes, node.parameters) ||
                     visitNode(cbNode, node.type);
-            case 287:
+            case 287 /* JSDocTypeLiteral */:
                 if (node.jsDocPropertyTags) {
                     for (var _i = 0, _a = node.jsDocPropertyTags; _i < _a.length; _i++) {
                         var tag = _a[_i];
@@ -12269,7 +15432,7 @@ var ts;
                     }
                 }
                 return;
-            case 301:
+            case 301 /* PartiallyEmittedExpression */:
                 return visitNode(cbNode, node.expression);
         }
     }
@@ -12278,11 +15441,11 @@ var ts;
         if (setParentNodes === void 0) { setParentNodes = false; }
         ts.performance.mark("beforeParse");
         var result;
-        if (languageVersion === 100) {
-            result = Parser.parseJsonText(fileName, sourceText, languageVersion, undefined, setParentNodes);
+        if (languageVersion === 100 /* JSON */) {
+            result = Parser.parseJsonText(fileName, sourceText, languageVersion, /*syntaxCursor*/ undefined, setParentNodes);
         }
         else {
-            result = Parser.parseSourceFile(fileName, sourceText, languageVersion, undefined, setParentNodes, scriptKind);
+            result = Parser.parseSourceFile(fileName, sourceText, languageVersion, /*syntaxCursor*/ undefined, setParentNodes, scriptKind);
         }
         ts.performance.mark("afterParse");
         ts.performance.measure("Parse", "beforeParse", "afterParse");
@@ -12293,41 +15456,71 @@ var ts;
         return Parser.parseIsolatedEntityName(text, languageVersion);
     }
     ts.parseIsolatedEntityName = parseIsolatedEntityName;
+    /**
+     * Parse json text into SyntaxTree and return node and parse errors if any
+     * @param fileName
+     * @param sourceText
+     */
     function parseJsonText(fileName, sourceText) {
         return Parser.parseJsonText(fileName, sourceText);
     }
     ts.parseJsonText = parseJsonText;
+    // See also `isExternalOrCommonJsModule` in utilities.ts
     function isExternalModule(file) {
         return file.externalModuleIndicator !== undefined;
     }
     ts.isExternalModule = isExternalModule;
+    // Produces a new SourceFile for the 'newText' provided. The 'textChangeRange' parameter
+    // indicates what changed between the 'text' that this SourceFile has and the 'newText'.
+    // The SourceFile will be created with the compiler attempting to reuse as many nodes from
+    // this file as possible.
+    //
+    // Note: this function mutates nodes from this SourceFile. That means any existing nodes
+    // from this SourceFile that are being held onto may change as a result (including
+    // becoming detached from any SourceFile).  It is recommended that this SourceFile not
+    // be used once 'update' is called on it.
     function updateSourceFile(sourceFile, newText, textChangeRange, aggressiveChecks) {
         if (aggressiveChecks === void 0) { aggressiveChecks = false; }
         var newSourceFile = IncrementalParser.updateSourceFile(sourceFile, newText, textChangeRange, aggressiveChecks);
-        newSourceFile.flags |= (sourceFile.flags & 1572864);
+        // Because new source file node is created, it may not have the flag PossiblyContainDynamicImport. This is the case if there is no new edit to add dynamic import.
+        // We will manually port the flag to the new source file.
+        newSourceFile.flags |= (sourceFile.flags & 1572864 /* PermanentlySetIncrementalFlags */);
         return newSourceFile;
     }
     ts.updateSourceFile = updateSourceFile;
+    /* @internal */
     function parseIsolatedJSDocComment(content, start, length) {
         var result = Parser.JSDocParser.parseIsolatedJSDocComment(content, start, length);
         if (result && result.jsDoc) {
+            // because the jsDocComment was parsed out of the source file, it might
+            // not be covered by the fixupParentReferences.
             Parser.fixupParentReferences(result.jsDoc);
         }
         return result;
     }
     ts.parseIsolatedJSDocComment = parseIsolatedJSDocComment;
+    /* @internal */
+    // Exposed only for testing.
     function parseJSDocTypeExpressionForTests(content, start, length) {
         return Parser.JSDocParser.parseJSDocTypeExpressionForTests(content, start, length);
     }
     ts.parseJSDocTypeExpressionForTests = parseJSDocTypeExpressionForTests;
+    // Implement the parser as a singleton module.  We do this for perf reasons because creating
+    // parser instances can actually be expensive enough to impact us on projects with many source
+    // files.
     var Parser;
     (function (Parser) {
-        var scanner = ts.createScanner(6, true);
-        var disallowInAndDecoratorContext = 2048 | 8192;
+        // Share a single scanner across all calls to parse a source file.  This helps speed things
+        // up by avoiding the cost of creating/compiling scanners over and over again.
+        var scanner = ts.createScanner(6 /* Latest */, /*skipTrivia*/ true);
+        var disallowInAndDecoratorContext = 2048 /* DisallowInContext */ | 8192 /* DecoratorContext */;
+        // capture constructors in 'initializeState' to avoid null checks
+        // tslint:disable variable-name
         var NodeConstructor;
         var TokenConstructor;
         var IdentifierConstructor;
         var SourceFileConstructor;
+        // tslint:enable variable-name
         var sourceFile;
         var parseDiagnostics;
         var syntaxCursor;
@@ -12337,14 +15530,87 @@ var ts;
         var identifiers;
         var identifierCount;
         var parsingContext;
+        // Flags that dictate what parsing context we're in.  For example:
+        // Whether or not we are in strict parsing mode.  All that changes in strict parsing mode is
+        // that some tokens that would be considered identifiers may be considered keywords.
+        //
+        // When adding more parser context flags, consider which is the more common case that the
+        // flag will be in.  This should be the 'false' state for that flag.  The reason for this is
+        // that we don't store data in our nodes unless the value is in the *non-default* state.  So,
+        // for example, more often than code 'allows-in' (or doesn't 'disallow-in').  We opt for
+        // 'disallow-in' set to 'false'.  Otherwise, if we had 'allowsIn' set to 'true', then almost
+        // all nodes would need extra state on them to store this info.
+        //
+        // Note: 'allowIn' and 'allowYield' track 1:1 with the [in] and [yield] concepts in the ES6
+        // grammar specification.
+        //
+        // An important thing about these context concepts.  By default they are effectively inherited
+        // while parsing through every grammar production.  i.e. if you don't change them, then when
+        // you parse a sub-production, it will have the same context values as the parent production.
+        // This is great most of the time.  After all, consider all the 'expression' grammar productions
+        // and how nearly all of them pass along the 'in' and 'yield' context values:
+        //
+        // EqualityExpression[In, Yield] :
+        //      RelationalExpression[?In, ?Yield]
+        //      EqualityExpression[?In, ?Yield] == RelationalExpression[?In, ?Yield]
+        //      EqualityExpression[?In, ?Yield] != RelationalExpression[?In, ?Yield]
+        //      EqualityExpression[?In, ?Yield] === RelationalExpression[?In, ?Yield]
+        //      EqualityExpression[?In, ?Yield] !== RelationalExpression[?In, ?Yield]
+        //
+        // Where you have to be careful is then understanding what the points are in the grammar
+        // where the values are *not* passed along.  For example:
+        //
+        // SingleNameBinding[Yield,GeneratorParameter]
+        //      [+GeneratorParameter]BindingIdentifier[Yield] Initializer[In]opt
+        //      [~GeneratorParameter]BindingIdentifier[?Yield]Initializer[In, ?Yield]opt
+        //
+        // Here this is saying that if the GeneratorParameter context flag is set, that we should
+        // explicitly set the 'yield' context flag to false before calling into the BindingIdentifier
+        // and we should explicitly unset the 'yield' context flag before calling into the Initializer.
+        // production.  Conversely, if the GeneratorParameter context flag is not set, then we
+        // should leave the 'yield' context flag alone.
+        //
+        // Getting this all correct is tricky and requires careful reading of the grammar to
+        // understand when these values should be changed versus when they should be inherited.
+        //
+        // Note: it should not be necessary to save/restore these flags during speculative/lookahead
+        // parsing.  These context flags are naturally stored and restored through normal recursive
+        // descent parsing and unwinding.
         var contextFlags;
+        // Whether or not we've had a parse error since creating the last AST node.  If we have
+        // encountered an error, it will be stored on the next AST node we create.  Parse errors
+        // can be broken down into three categories:
+        //
+        // 1) An error that occurred during scanning.  For example, an unterminated literal, or a
+        //    character that was completely not understood.
+        //
+        // 2) A token was expected, but was not present.  This type of error is commonly produced
+        //    by the 'parseExpected' function.
+        //
+        // 3) A token was present that no parsing function was able to consume.  This type of error
+        //    only occurs in the 'abortParsingListOrMoveToNextToken' function when the parser
+        //    decides to skip the token.
+        //
+        // In all of these cases, we want to mark the next node as having had an error before it.
+        // With this mark, we can know in incremental settings if this node can be reused, or if
+        // we have to reparse it.  If we don't keep this information around, we may just reuse the
+        // node.  in that event we would then not produce the same errors as we did before, causing
+        // significant confusion problems.
+        //
+        // Note: it is necessary that this value be saved/restored during speculative/lookahead
+        // parsing.  During lookahead parsing, we will often create a node.  That node will have
+        // this value attached, and then this value will be set back to 'false'.  If we decide to
+        // rewind, we must get back to the same value we had prior to the lookahead.
+        //
+        // Note: any errors at the end of the file that do not precede a regular node, should get
+        // attached to the EOF token.
         var parseErrorBeforeNextFinishedNode = false;
         function parseSourceFile(fileName, sourceText, languageVersion, syntaxCursor, setParentNodes, scriptKind) {
             if (setParentNodes === void 0) { setParentNodes = false; }
             scriptKind = ts.ensureScriptKind(fileName, scriptKind);
-            if (scriptKind === 6) {
+            if (scriptKind === 6 /* JSON */) {
                 var result_1 = parseJsonText(fileName, sourceText, languageVersion, syntaxCursor, setParentNodes);
-                ts.convertToObjectWorker(result_1, result_1.parseDiagnostics, false, undefined, undefined);
+                ts.convertToObjectWorker(result_1, result_1.parseDiagnostics, /*returnValue*/ false, /*knownRootOptions*/ undefined, /*jsonConversionNotifier*/ undefined);
                 result_1.typeReferenceDirectives = ts.emptyArray;
                 result_1.amdDependencies = ts.emptyArray;
                 return result_1;
@@ -12356,57 +15622,62 @@ var ts;
         }
         Parser.parseSourceFile = parseSourceFile;
         function parseIsolatedEntityName(content, languageVersion) {
-            initializeState(content, languageVersion, undefined, 1);
+            // Choice of `isDeclarationFile` should be arbitrary
+            initializeState(content, languageVersion, /*syntaxCursor*/ undefined, 1 /* JS */);
+            // Prime the scanner.
             nextToken();
-            var entityName = parseEntityName(true);
-            var isInvalid = token() === 1 && !parseDiagnostics.length;
+            var entityName = parseEntityName(/*allowReservedWords*/ true);
+            var isInvalid = token() === 1 /* EndOfFileToken */ && !parseDiagnostics.length;
             clearState();
             return isInvalid ? entityName : undefined;
         }
         Parser.parseIsolatedEntityName = parseIsolatedEntityName;
         function parseJsonText(fileName, sourceText, languageVersion, syntaxCursor, setParentNodes) {
-            if (languageVersion === void 0) { languageVersion = 2; }
-            initializeState(sourceText, languageVersion, syntaxCursor, 6);
-            sourceFile = createSourceFile(fileName, 2, 6, false);
+            if (languageVersion === void 0) { languageVersion = 2 /* ES2015 */; }
+            initializeState(sourceText, languageVersion, syntaxCursor, 6 /* JSON */);
+            // Set source file so that errors will be reported with this file name
+            sourceFile = createSourceFile(fileName, 2 /* ES2015 */, 6 /* JSON */, /*isDeclaration*/ false);
             sourceFile.flags = contextFlags;
+            // Prime the scanner.
             nextToken();
             var pos = getNodePos();
-            if (token() === 1) {
+            if (token() === 1 /* EndOfFileToken */) {
                 sourceFile.statements = createNodeArray([], pos, pos);
                 sourceFile.endOfFileToken = parseTokenNode();
             }
             else {
-                var statement = createNode(216);
+                var statement = createNode(216 /* ExpressionStatement */);
                 switch (token()) {
-                    case 21:
+                    case 21 /* OpenBracketToken */:
                         statement.expression = parseArrayLiteralExpression();
                         break;
-                    case 101:
-                    case 86:
-                    case 95:
+                    case 101 /* TrueKeyword */:
+                    case 86 /* FalseKeyword */:
+                    case 95 /* NullKeyword */:
                         statement.expression = parseTokenNode();
                         break;
-                    case 38:
-                        if (lookAhead(function () { return nextToken() === 8 && nextToken() !== 56; })) {
+                    case 38 /* MinusToken */:
+                        if (lookAhead(function () { return nextToken() === 8 /* NumericLiteral */ && nextToken() !== 56 /* ColonToken */; })) {
                             statement.expression = parsePrefixUnaryExpression();
                         }
                         else {
                             statement.expression = parseObjectLiteralExpression();
                         }
                         break;
-                    case 8:
-                    case 9:
-                        if (lookAhead(function () { return nextToken() !== 56; })) {
+                    case 8 /* NumericLiteral */:
+                    case 9 /* StringLiteral */:
+                        if (lookAhead(function () { return nextToken() !== 56 /* ColonToken */; })) {
                             statement.expression = parseLiteralNode();
                             break;
                         }
+                    // falls through
                     default:
                         statement.expression = parseObjectLiteralExpression();
                         break;
                 }
                 finishNode(statement);
                 sourceFile.statements = createNodeArray([statement], pos);
-                sourceFile.endOfFileToken = parseExpectedToken(1, ts.Diagnostics.Unexpected_token);
+                sourceFile.endOfFileToken = parseExpectedToken(1 /* EndOfFileToken */, ts.Diagnostics.Unexpected_token);
             }
             if (setParentNodes) {
                 fixupParentReferences(sourceFile);
@@ -12418,7 +15689,8 @@ var ts;
         }
         Parser.parseJsonText = parseJsonText;
         function getLanguageVariant(scriptKind) {
-            return scriptKind === 4 || scriptKind === 2 || scriptKind === 1 || scriptKind === 6 ? 1 : 0;
+            // .tsx and .jsx files are treated as jsx language variant.
+            return scriptKind === 4 /* TSX */ || scriptKind === 2 /* JSX */ || scriptKind === 1 /* JS */ || scriptKind === 6 /* JSON */ ? 1 /* JSX */ : 0 /* Standard */;
         }
         function initializeState(_sourceText, languageVersion, _syntaxCursor, scriptKind) {
             NodeConstructor = ts.objectAllocator.getNodeConstructor();
@@ -12433,26 +15705,29 @@ var ts;
             identifierCount = 0;
             nodeCount = 0;
             switch (scriptKind) {
-                case 1:
-                case 2:
-                    contextFlags = 65536;
+                case 1 /* JS */:
+                case 2 /* JSX */:
+                    contextFlags = 65536 /* JavaScriptFile */;
                     break;
-                case 6:
-                    contextFlags = 65536 | 16777216;
+                case 6 /* JSON */:
+                    contextFlags = 65536 /* JavaScriptFile */ | 16777216 /* JsonFile */;
                     break;
                 default:
-                    contextFlags = 0;
+                    contextFlags = 0 /* None */;
                     break;
             }
             parseErrorBeforeNextFinishedNode = false;
+            // Initialize and prime the scanner before parsing the source elements.
             scanner.setText(sourceText);
             scanner.setOnError(scanError);
             scanner.setScriptTarget(languageVersion);
             scanner.setLanguageVariant(getLanguageVariant(scriptKind));
         }
         function clearState() {
+            // Clear out the text the scanner is pointing at, so it doesn't keep anything alive unnecessarily.
             scanner.setText("");
             scanner.setOnError(undefined);
+            // Clear any data.  We don't want to accidentally hold onto it for too long.
             parseDiagnostics = undefined;
             sourceFile = undefined;
             identifiers = undefined;
@@ -12462,15 +15737,17 @@ var ts;
         function parseSourceFileWorker(fileName, languageVersion, setParentNodes, scriptKind) {
             var isDeclarationFile = isDeclarationFileName(fileName);
             if (isDeclarationFile) {
-                contextFlags |= 4194304;
+                contextFlags |= 4194304 /* Ambient */;
             }
             sourceFile = createSourceFile(fileName, languageVersion, scriptKind, isDeclarationFile);
             sourceFile.flags = contextFlags;
+            // Prime the scanner.
             nextToken();
+            // A member of ReadonlyArray<T> isn't assignable to a member of T[] (and prevents a direct cast) - but this is where we set up those members so they can be readonly in the future
             processCommentPragmas(sourceFile, sourceText);
             processPragmasIntoFields(sourceFile, reportPragmaDiagnostic);
-            sourceFile.statements = parseList(0, parseStatement);
-            ts.Debug.assert(token() === 1);
+            sourceFile.statements = parseList(0 /* SourceElements */, parseStatement);
+            ts.Debug.assert(token() === 1 /* EndOfFileToken */);
             sourceFile.endOfFileToken = addJSDocComment(parseTokenNode());
             setExternalModuleIndicator(sourceFile);
             sourceFile.nodeCount = nodeCount;
@@ -12496,10 +15773,17 @@ var ts;
             return node;
         }
         function fixupParentReferences(rootNode) {
+            // normally parent references are set during binding. However, for clients that only need
+            // a syntax tree, and no semantic features, then the binding process is an unnecessary
+            // overhead.  This functions allows us to set all the parents, without all the expense of
+            // binding.
             var parent = rootNode;
             forEachChild(rootNode, visitNode);
             return;
             function visitNode(n) {
+                // walk down setting parents that differ from the parent we think it should be.  This
+                // allows us to quickly bail out of setting parents for subtrees during incremental
+                // parsing
                 if (n.parent !== parent) {
                     n.parent = parent;
                     var saveParent = parent;
@@ -12519,7 +15803,9 @@ var ts;
         }
         Parser.fixupParentReferences = fixupParentReferences;
         function createSourceFile(fileName, languageVersion, scriptKind, isDeclarationFile) {
-            var sourceFile = new SourceFileConstructor(274, 0, sourceText.length);
+            // code from createNode is inlined here so createNode won't have to deal with special case of creating source files
+            // this is quite rare comparing to other nodes and createNode should be as fast as possible
+            var sourceFile = new SourceFileConstructor(274 /* SourceFile */, /*pos*/ 0, /* end */ sourceText.length);
             nodeCount++;
             sourceFile.text = sourceText;
             sourceFile.bindDiagnostics = [];
@@ -12540,81 +15826,102 @@ var ts;
             }
         }
         function setDisallowInContext(val) {
-            setContextFlag(val, 2048);
+            setContextFlag(val, 2048 /* DisallowInContext */);
         }
         function setYieldContext(val) {
-            setContextFlag(val, 4096);
+            setContextFlag(val, 4096 /* YieldContext */);
         }
         function setDecoratorContext(val) {
-            setContextFlag(val, 8192);
+            setContextFlag(val, 8192 /* DecoratorContext */);
         }
         function setAwaitContext(val) {
-            setContextFlag(val, 16384);
+            setContextFlag(val, 16384 /* AwaitContext */);
         }
         function doOutsideOfContext(context, func) {
+            // contextFlagsToClear will contain only the context flags that are
+            // currently set that we need to temporarily clear
+            // We don't just blindly reset to the previous flags to ensure
+            // that we do not mutate cached flags for the incremental
+            // parser (ThisNodeHasError, ThisNodeOrAnySubNodesHasError, and
+            // HasAggregatedChildData).
             var contextFlagsToClear = context & contextFlags;
             if (contextFlagsToClear) {
-                setContextFlag(false, contextFlagsToClear);
+                // clear the requested context flags
+                setContextFlag(/*val*/ false, contextFlagsToClear);
                 var result = func();
-                setContextFlag(true, contextFlagsToClear);
+                // restore the context flags we just cleared
+                setContextFlag(/*val*/ true, contextFlagsToClear);
                 return result;
             }
+            // no need to do anything special as we are not in any of the requested contexts
             return func();
         }
         function doInsideOfContext(context, func) {
+            // contextFlagsToSet will contain only the context flags that
+            // are not currently set that we need to temporarily enable.
+            // We don't just blindly reset to the previous flags to ensure
+            // that we do not mutate cached flags for the incremental
+            // parser (ThisNodeHasError, ThisNodeOrAnySubNodesHasError, and
+            // HasAggregatedChildData).
             var contextFlagsToSet = context & ~contextFlags;
             if (contextFlagsToSet) {
-                setContextFlag(true, contextFlagsToSet);
+                // set the requested context flags
+                setContextFlag(/*val*/ true, contextFlagsToSet);
                 var result = func();
-                setContextFlag(false, contextFlagsToSet);
+                // reset the context flags we just set
+                setContextFlag(/*val*/ false, contextFlagsToSet);
                 return result;
             }
+            // no need to do anything special as we are already in all of the requested contexts
             return func();
         }
         function allowInAnd(func) {
-            return doOutsideOfContext(2048, func);
+            return doOutsideOfContext(2048 /* DisallowInContext */, func);
         }
         function disallowInAnd(func) {
-            return doInsideOfContext(2048, func);
+            return doInsideOfContext(2048 /* DisallowInContext */, func);
         }
         function doInYieldContext(func) {
-            return doInsideOfContext(4096, func);
+            return doInsideOfContext(4096 /* YieldContext */, func);
         }
         function doInDecoratorContext(func) {
-            return doInsideOfContext(8192, func);
+            return doInsideOfContext(8192 /* DecoratorContext */, func);
         }
         function doInAwaitContext(func) {
-            return doInsideOfContext(16384, func);
+            return doInsideOfContext(16384 /* AwaitContext */, func);
         }
         function doOutsideOfAwaitContext(func) {
-            return doOutsideOfContext(16384, func);
+            return doOutsideOfContext(16384 /* AwaitContext */, func);
         }
         function doInYieldAndAwaitContext(func) {
-            return doInsideOfContext(4096 | 16384, func);
+            return doInsideOfContext(4096 /* YieldContext */ | 16384 /* AwaitContext */, func);
         }
         function inContext(flags) {
             return (contextFlags & flags) !== 0;
         }
         function inYieldContext() {
-            return inContext(4096);
+            return inContext(4096 /* YieldContext */);
         }
         function inDisallowInContext() {
-            return inContext(2048);
+            return inContext(2048 /* DisallowInContext */);
         }
         function inDecoratorContext() {
-            return inContext(8192);
+            return inContext(8192 /* DecoratorContext */);
         }
         function inAwaitContext() {
-            return inContext(16384);
+            return inContext(16384 /* AwaitContext */);
         }
         function parseErrorAtCurrentToken(message, arg0) {
             parseErrorAt(scanner.getTokenPos(), scanner.getTextPos(), message, arg0);
         }
         function parseErrorAtPosition(start, length, message, arg0) {
+            // Don't report another error if it would just be at the same position as the last error.
             var lastError = ts.lastOrUndefined(parseDiagnostics);
             if (!lastError || start !== lastError.start) {
                 parseDiagnostics.push(ts.createFileDiagnostic(sourceFile, start, length, message, arg0));
             }
+            // Mark that we've encountered an error.  We'll set an appropriate bit on the next
+            // node we finish so that it can't be reused incrementally.
             parseErrorBeforeNextFinishedNode = true;
         }
         function parseErrorAt(start, end, message, arg0) {
@@ -12629,6 +15936,12 @@ var ts;
         function getNodePos() {
             return scanner.getStartPos();
         }
+        // Use this function to access the current token instead of reading the currentToken
+        // variable. Since function results aren't narrowed in control flow analysis, this ensures
+        // that the type checker doesn't make wrong assumptions about the type of the current
+        // token (e.g. a call to nextToken() changes the current token but the checker doesn't
+        // reason about this side effect).  Mainstream VMs inline simple functions like this, so
+        // there is no performance penalty.
         function token() {
             return currentToken;
         }
@@ -12654,14 +15967,25 @@ var ts;
             return currentToken = scanner.scanJsxAttributeValue();
         }
         function speculationHelper(callback, isLookAhead) {
+            // Keep track of the state we'll need to rollback to if lookahead fails (or if the
+            // caller asked us to always reset our state).
             var saveToken = currentToken;
             var saveParseDiagnosticsLength = parseDiagnostics.length;
             var saveParseErrorBeforeNextFinishedNode = parseErrorBeforeNextFinishedNode;
+            // Note: it is not actually necessary to save/restore the context flags here.  That's
+            // because the saving/restoring of these flags happens naturally through the recursive
+            // descent nature of our parser.  However, we still store this here just so we can
+            // assert that invariant holds.
             var saveContextFlags = contextFlags;
+            // If we're only looking ahead, then tell the scanner to only lookahead as well.
+            // Otherwise, if we're actually speculatively parsing, then tell the scanner to do the
+            // same.
             var result = isLookAhead
                 ? scanner.lookAhead(callback)
                 : scanner.tryScan(callback);
             ts.Debug.assert(saveContextFlags === contextFlags);
+            // If our callback returned something 'falsy' or we're just looking ahead,
+            // then unconditionally restore us to where we were.
             if (!result || isLookAhead) {
                 currentToken = saveToken;
                 parseDiagnostics.length = saveParseDiagnosticsLength;
@@ -12669,23 +15993,37 @@ var ts;
             }
             return result;
         }
+        /** Invokes the provided callback then unconditionally restores the parser to the state it
+         * was in immediately prior to invoking the callback.  The result of invoking the callback
+         * is returned from this function.
+         */
         function lookAhead(callback) {
-            return speculationHelper(callback, true);
+            return speculationHelper(callback, /*isLookAhead*/ true);
         }
+        /** Invokes the provided callback.  If the callback returns something falsy, then it restores
+         * the parser to the state it was in immediately prior to invoking the callback.  If the
+         * callback returns something truthy, then the parser state is not rolled back.  The result
+         * of invoking the callback is returned from this function.
+         */
         function tryParse(callback) {
-            return speculationHelper(callback, false);
+            return speculationHelper(callback, /*isLookAhead*/ false);
         }
+        // Ignore strict mode flag because we will report an error in type checker instead.
         function isIdentifier() {
-            if (token() === 71) {
+            if (token() === 71 /* Identifier */) {
                 return true;
             }
-            if (token() === 116 && inYieldContext()) {
+            // If we have a 'yield' keyword, and we're in the [yield] context, then 'yield' is
+            // considered a keyword and is not an identifier.
+            if (token() === 116 /* YieldKeyword */ && inYieldContext()) {
                 return false;
             }
-            if (token() === 121 && inAwaitContext()) {
+            // If we have a 'await' keyword, and we're in the [Await] context, then 'await' is
+            // considered a keyword and is not an identifier.
+            if (token() === 121 /* AwaitKeyword */ && inAwaitContext()) {
                 return false;
             }
-            return token() > 107;
+            return token() > 107 /* LastReservedWord */;
         }
         function parseExpected(kind, diagnosticMessage, shouldAdvance) {
             if (shouldAdvance === void 0) { shouldAdvance = true; }
@@ -12695,6 +16033,7 @@ var ts;
                 }
                 return true;
             }
+            // Report specific message if provided with one.  Otherwise, report generic fallback message.
             if (diagnosticMessage) {
                 parseErrorAtCurrentToken(diagnosticMessage);
             }
@@ -12718,7 +16057,7 @@ var ts;
         }
         function parseExpectedToken(t, diagnosticMessage, arg0) {
             return parseOptionalToken(t) ||
-                createMissingNode(t, false, diagnosticMessage || ts.Diagnostics._0_expected, arg0 || ts.tokenToString(t));
+                createMissingNode(t, /*reportAtCurrentPosition*/ false, diagnosticMessage || ts.Diagnostics._0_expected, arg0 || ts.tokenToString(t));
         }
         function parseTokenNode() {
             var node = createNode(token());
@@ -12726,37 +16065,43 @@ var ts;
             return finishNode(node);
         }
         function canParseSemicolon() {
-            if (token() === 25) {
+            // If there's a real semicolon, then we can always parse it out.
+            if (token() === 25 /* SemicolonToken */) {
                 return true;
             }
-            return token() === 18 || token() === 1 || scanner.hasPrecedingLineBreak();
+            // We can parse out an optional semicolon in ASI cases in the following cases.
+            return token() === 18 /* CloseBraceToken */ || token() === 1 /* EndOfFileToken */ || scanner.hasPrecedingLineBreak();
         }
         function parseSemicolon() {
             if (canParseSemicolon()) {
-                if (token() === 25) {
+                if (token() === 25 /* SemicolonToken */) {
+                    // consume the semicolon if it was explicitly provided.
                     nextToken();
                 }
                 return true;
             }
             else {
-                return parseExpected(25);
+                return parseExpected(25 /* SemicolonToken */);
             }
         }
         function createNode(kind, pos) {
             nodeCount++;
             var p = pos >= 0 ? pos : scanner.getStartPos();
-            return ts.isNodeKind(kind) || kind === 0 ? new NodeConstructor(kind, p, p) :
-                kind === 71 ? new IdentifierConstructor(kind, p, p) :
+            return ts.isNodeKind(kind) || kind === 0 /* Unknown */ ? new NodeConstructor(kind, p, p) :
+                kind === 71 /* Identifier */ ? new IdentifierConstructor(kind, p, p) :
                     new TokenConstructor(kind, p, p);
         }
-        function createNodeWithJSDoc(kind) {
-            var node = createNode(kind);
-            if (scanner.getTokenFlags() & 2) {
+        function createNodeWithJSDoc(kind, pos) {
+            var node = createNode(kind, pos);
+            if (scanner.getTokenFlags() & 2 /* PrecedingJSDocComment */) {
                 addJSDocComment(node);
             }
             return node;
         }
         function createNodeArray(elements, pos, end) {
+            // Since the element list of a node array is typically created by starting with an empty array and
+            // repeatedly calling push(), the list may not have the optimal memory layout. We invoke slice() for
+            // small arrays (1 to 4 elements) to give the VM a chance to allocate an optimal representation.
             var length = elements.length;
             var array = (length >= 1 && length <= 4 ? elements.slice() : elements);
             array.pos = pos;
@@ -12768,9 +16113,12 @@ var ts;
             if (contextFlags) {
                 node.flags |= contextFlags;
             }
+            // Keep track on the node if we encountered an error while parsing it.  If we did, then
+            // we cannot reuse the node incrementally.  Once we've marked this node, clear out the
+            // flag so that we don't mark any subsequent nodes.
             if (parseErrorBeforeNextFinishedNode) {
                 parseErrorBeforeNextFinishedNode = false;
-                node.flags |= 32768;
+                node.flags |= 32768 /* ThisNodeHasError */;
             }
             return node;
         }
@@ -12782,7 +16130,7 @@ var ts;
                 parseErrorAtCurrentToken(diagnosticMessage, arg0);
             }
             var result = createNode(kind);
-            if (kind === 71) {
+            if (kind === 71 /* Identifier */) {
                 result.escapedText = "";
             }
             else if (ts.isLiteralKind(kind) || ts.isTemplateLiteralKind(kind)) {
@@ -12797,19 +16145,24 @@ var ts;
             }
             return identifier;
         }
+        // An identifier that starts with two underscores has an extra underscore character prepended to it to avoid issues
+        // with magic property names like '__proto__'. The 'identifiers' object is used to share a single string instance for
+        // each identifier in order to reduce memory consumption.
         function createIdentifier(isIdentifier, diagnosticMessage) {
             identifierCount++;
             if (isIdentifier) {
-                var node = createNode(71);
-                if (token() !== 71) {
+                var node = createNode(71 /* Identifier */);
+                // Store original token kind if it is not just an Identifier so we can report appropriate error later in type checker
+                if (token() !== 71 /* Identifier */) {
                     node.originalKeywordKind = token();
                 }
                 node.escapedText = ts.escapeLeadingUnderscores(internIdentifier(scanner.getTokenValue()));
                 nextToken();
                 return finishNode(node);
             }
-            var reportAtCurrentPosition = token() === 1;
-            return createMissingNode(71, reportAtCurrentPosition, diagnosticMessage || ts.Diagnostics.Identifier_expected);
+            // Only for end of file because the error gets reported incorrectly on embedded script tags.
+            var reportAtCurrentPosition = token() === 1 /* EndOfFileToken */;
+            return createMissingNode(71 /* Identifier */, reportAtCurrentPosition, diagnosticMessage || ts.Diagnostics.Identifier_expected);
         }
         function parseIdentifier(diagnosticMessage) {
             return createIdentifier(isIdentifier(), diagnosticMessage);
@@ -12819,28 +16172,34 @@ var ts;
         }
         function isLiteralPropertyName() {
             return ts.tokenIsIdentifierOrKeyword(token()) ||
-                token() === 9 ||
-                token() === 8;
+                token() === 9 /* StringLiteral */ ||
+                token() === 8 /* NumericLiteral */;
         }
         function parsePropertyNameWorker(allowComputedPropertyNames) {
-            if (token() === 9 || token() === 8) {
+            if (token() === 9 /* StringLiteral */ || token() === 8 /* NumericLiteral */) {
                 var node = parseLiteralNode();
                 node.text = internIdentifier(node.text);
                 return node;
             }
-            if (allowComputedPropertyNames && token() === 21) {
+            if (allowComputedPropertyNames && token() === 21 /* OpenBracketToken */) {
                 return parseComputedPropertyName();
             }
             return parseIdentifierName();
         }
         function parsePropertyName() {
-            return parsePropertyNameWorker(true);
+            return parsePropertyNameWorker(/*allowComputedPropertyNames*/ true);
         }
         function parseComputedPropertyName() {
-            var node = createNode(147);
-            parseExpected(21);
+            // PropertyName [Yield]:
+            //      LiteralPropertyName
+            //      ComputedPropertyName[?Yield]
+            var node = createNode(147 /* ComputedPropertyName */);
+            parseExpected(21 /* OpenBracketToken */);
+            // We parse any expression (including a comma expression). But the grammar
+            // says that only an assignment expression is allowed, so the grammar checker
+            // will error if it sees a comma expression.
             node.expression = allowInAnd(parseExpression);
-            parseExpected(22);
+            parseExpected(22 /* CloseBracketToken */);
             return finishNode(node);
         }
         function parseContextualModifier(t) {
@@ -12855,19 +16214,20 @@ var ts;
         }
         function nextTokenCanFollowModifier() {
             switch (token()) {
-                case 76:
-                    return nextToken() === 83;
-                case 84:
+                case 76 /* ConstKeyword */:
+                    // 'const' is only a modifier if followed by 'enum'.
+                    return nextToken() === 83 /* EnumKeyword */;
+                case 84 /* ExportKeyword */:
                     nextToken();
-                    if (token() === 79) {
+                    if (token() === 79 /* DefaultKeyword */) {
                         return lookAhead(nextTokenCanFollowDefaultKeyword);
                     }
-                    return token() !== 39 && token() !== 118 && token() !== 17 && canFollowModifier();
-                case 79:
+                    return token() !== 39 /* AsteriskToken */ && token() !== 118 /* AsKeyword */ && token() !== 17 /* OpenBraceToken */ && canFollowModifier();
+                case 79 /* DefaultKeyword */:
                     return nextTokenCanFollowDefaultKeyword();
-                case 115:
-                case 125:
-                case 136:
+                case 115 /* StaticKeyword */:
+                case 125 /* GetKeyword */:
+                case 136 /* SetKeyword */:
                     nextToken();
                     return canFollowModifier();
                 default:
@@ -12878,86 +16238,112 @@ var ts;
             return ts.isModifierKind(token()) && tryParse(nextTokenCanFollowModifier);
         }
         function canFollowModifier() {
-            return token() === 21
-                || token() === 17
-                || token() === 39
-                || token() === 24
+            return token() === 21 /* OpenBracketToken */
+                || token() === 17 /* OpenBraceToken */
+                || token() === 39 /* AsteriskToken */
+                || token() === 24 /* DotDotDotToken */
                 || isLiteralPropertyName();
         }
         function nextTokenCanFollowDefaultKeyword() {
             nextToken();
-            return token() === 75 || token() === 89 ||
-                token() === 109 ||
-                (token() === 117 && lookAhead(nextTokenIsClassKeywordOnSameLine)) ||
-                (token() === 120 && lookAhead(nextTokenIsFunctionKeywordOnSameLine));
+            return token() === 75 /* ClassKeyword */ || token() === 89 /* FunctionKeyword */ ||
+                token() === 109 /* InterfaceKeyword */ ||
+                (token() === 117 /* AbstractKeyword */ && lookAhead(nextTokenIsClassKeywordOnSameLine)) ||
+                (token() === 120 /* AsyncKeyword */ && lookAhead(nextTokenIsFunctionKeywordOnSameLine));
         }
+        // True if positioned at the start of a list element
         function isListElement(parsingContext, inErrorRecovery) {
             var node = currentNode(parsingContext);
             if (node) {
                 return true;
             }
             switch (parsingContext) {
-                case 0:
-                case 1:
-                case 3:
-                    return !(token() === 25 && inErrorRecovery) && isStartOfStatement();
-                case 2:
-                    return token() === 73 || token() === 79;
-                case 4:
+                case 0 /* SourceElements */:
+                case 1 /* BlockStatements */:
+                case 3 /* SwitchClauseStatements */:
+                    // If we're in error recovery, then we don't want to treat ';' as an empty statement.
+                    // The problem is that ';' can show up in far too many contexts, and if we see one
+                    // and assume it's a statement, then we may bail out inappropriately from whatever
+                    // we're parsing.  For example, if we have a semicolon in the middle of a class, then
+                    // we really don't want to assume the class is over and we're on a statement in the
+                    // outer module.  We just want to consume and move on.
+                    return !(token() === 25 /* SemicolonToken */ && inErrorRecovery) && isStartOfStatement();
+                case 2 /* SwitchClauses */:
+                    return token() === 73 /* CaseKeyword */ || token() === 79 /* DefaultKeyword */;
+                case 4 /* TypeMembers */:
                     return lookAhead(isTypeMemberStart);
-                case 5:
-                    return lookAhead(isClassMemberStart) || (token() === 25 && !inErrorRecovery);
-                case 6:
-                    return token() === 21 || isLiteralPropertyName();
-                case 12:
-                    return token() === 21 || token() === 39 || token() === 24 || isLiteralPropertyName();
-                case 17:
+                case 5 /* ClassMembers */:
+                    // We allow semicolons as class elements (as specified by ES6) as long as we're
+                    // not in error recovery.  If we're in error recovery, we don't want an errant
+                    // semicolon to be treated as a class member (since they're almost always used
+                    // for statements.
+                    return lookAhead(isClassMemberStart) || (token() === 25 /* SemicolonToken */ && !inErrorRecovery);
+                case 6 /* EnumMembers */:
+                    // Include open bracket computed properties. This technically also lets in indexers,
+                    // which would be a candidate for improved error reporting.
+                    return token() === 21 /* OpenBracketToken */ || isLiteralPropertyName();
+                case 12 /* ObjectLiteralMembers */:
+                    return token() === 21 /* OpenBracketToken */ || token() === 39 /* AsteriskToken */ || token() === 24 /* DotDotDotToken */ || isLiteralPropertyName();
+                case 17 /* RestProperties */:
                     return isLiteralPropertyName();
-                case 9:
-                    return token() === 21 || token() === 24 || isLiteralPropertyName();
-                case 7:
-                    if (token() === 17) {
+                case 9 /* ObjectBindingElements */:
+                    return token() === 21 /* OpenBracketToken */ || token() === 24 /* DotDotDotToken */ || isLiteralPropertyName();
+                case 7 /* HeritageClauseElement */:
+                    // If we see `{ ... }` then only consume it as an expression if it is followed by `,` or `{`
+                    // That way we won't consume the body of a class in its heritage clause.
+                    if (token() === 17 /* OpenBraceToken */) {
                         return lookAhead(isValidHeritageClauseObjectLiteral);
                     }
                     if (!inErrorRecovery) {
                         return isStartOfLeftHandSideExpression() && !isHeritageClauseExtendsOrImplementsKeyword();
                     }
                     else {
+                        // If we're in error recovery we tighten up what we're willing to match.
+                        // That way we don't treat something like "this" as a valid heritage clause
+                        // element during recovery.
                         return isIdentifier() && !isHeritageClauseExtendsOrImplementsKeyword();
                     }
-                case 8:
+                case 8 /* VariableDeclarations */:
                     return isIdentifierOrPattern();
-                case 10:
-                    return token() === 26 || token() === 24 || isIdentifierOrPattern();
-                case 18:
+                case 10 /* ArrayBindingElements */:
+                    return token() === 26 /* CommaToken */ || token() === 24 /* DotDotDotToken */ || isIdentifierOrPattern();
+                case 18 /* TypeParameters */:
                     return isIdentifier();
-                case 15:
-                    if (token() === 26) {
+                case 15 /* ArrayLiteralMembers */:
+                    if (token() === 26 /* CommaToken */) {
                         return true;
                     }
-                case 11:
-                    return token() === 24 || isStartOfExpression();
-                case 16:
+                // falls through
+                case 11 /* ArgumentExpressions */:
+                    return token() === 24 /* DotDotDotToken */ || isStartOfExpression();
+                case 16 /* Parameters */:
                     return isStartOfParameter();
-                case 19:
-                case 20:
-                    return token() === 26 || isStartOfType();
-                case 21:
+                case 19 /* TypeArguments */:
+                case 20 /* TupleElementTypes */:
+                    return token() === 26 /* CommaToken */ || isStartOfType();
+                case 21 /* HeritageClauses */:
                     return isHeritageClause();
-                case 22:
+                case 22 /* ImportOrExportSpecifiers */:
                     return ts.tokenIsIdentifierOrKeyword(token());
-                case 13:
-                    return ts.tokenIsIdentifierOrKeyword(token()) || token() === 17;
-                case 14:
+                case 13 /* JsxAttributes */:
+                    return ts.tokenIsIdentifierOrKeyword(token()) || token() === 17 /* OpenBraceToken */;
+                case 14 /* JsxChildren */:
                     return true;
             }
             return ts.Debug.fail("Non-exhaustive case in 'isListElement'.");
         }
         function isValidHeritageClauseObjectLiteral() {
-            ts.Debug.assert(token() === 17);
-            if (nextToken() === 18) {
+            ts.Debug.assert(token() === 17 /* OpenBraceToken */);
+            if (nextToken() === 18 /* CloseBraceToken */) {
+                // if we see "extends {}" then only treat the {} as what we're extending (and not
+                // the class body) if we have:
+                //
+                //      extends {} {
+                //      extends {},
+                //      extends {} extends
+                //      extends {} implements
                 var next = nextToken();
-                return next === 26 || next === 17 || next === 85 || next === 108;
+                return next === 26 /* CommaToken */ || next === 17 /* OpenBraceToken */ || next === 85 /* ExtendsKeyword */ || next === 108 /* ImplementsKeyword */;
             }
             return true;
         }
@@ -12974,8 +16360,8 @@ var ts;
             return ts.tokenIsIdentifierOrKeywordOrGreaterThan(token());
         }
         function isHeritageClauseExtendsOrImplementsKeyword() {
-            if (token() === 108 ||
-                token() === 85) {
+            if (token() === 108 /* ImplementsKeyword */ ||
+                token() === 85 /* ExtendsKeyword */) {
                 return lookAhead(nextTokenIsStartOfExpression);
             }
             return false;
@@ -12988,78 +16374,95 @@ var ts;
             nextToken();
             return isStartOfType();
         }
+        // True if positioned at a list terminator
         function isListTerminator(kind) {
-            if (token() === 1) {
+            if (token() === 1 /* EndOfFileToken */) {
+                // Being at the end of the file ends all lists.
                 return true;
             }
             switch (kind) {
-                case 1:
-                case 2:
-                case 4:
-                case 5:
-                case 6:
-                case 12:
-                case 9:
-                case 22:
-                    return token() === 18;
-                case 3:
-                    return token() === 18 || token() === 73 || token() === 79;
-                case 7:
-                    return token() === 17 || token() === 85 || token() === 108;
-                case 8:
+                case 1 /* BlockStatements */:
+                case 2 /* SwitchClauses */:
+                case 4 /* TypeMembers */:
+                case 5 /* ClassMembers */:
+                case 6 /* EnumMembers */:
+                case 12 /* ObjectLiteralMembers */:
+                case 9 /* ObjectBindingElements */:
+                case 22 /* ImportOrExportSpecifiers */:
+                    return token() === 18 /* CloseBraceToken */;
+                case 3 /* SwitchClauseStatements */:
+                    return token() === 18 /* CloseBraceToken */ || token() === 73 /* CaseKeyword */ || token() === 79 /* DefaultKeyword */;
+                case 7 /* HeritageClauseElement */:
+                    return token() === 17 /* OpenBraceToken */ || token() === 85 /* ExtendsKeyword */ || token() === 108 /* ImplementsKeyword */;
+                case 8 /* VariableDeclarations */:
                     return isVariableDeclaratorListTerminator();
-                case 18:
-                    return token() === 29 || token() === 19 || token() === 17 || token() === 85 || token() === 108;
-                case 11:
-                    return token() === 20 || token() === 25;
-                case 15:
-                case 20:
-                case 10:
-                    return token() === 22;
-                case 16:
-                case 17:
-                    return token() === 20 || token() === 22;
-                case 19:
-                    return token() !== 26;
-                case 21:
-                    return token() === 17 || token() === 18;
-                case 13:
-                    return token() === 29 || token() === 41;
-                case 14:
-                    return token() === 27 && lookAhead(nextTokenIsSlash);
+                case 18 /* TypeParameters */:
+                    // Tokens other than '>' are here for better error recovery
+                    return token() === 29 /* GreaterThanToken */ || token() === 19 /* OpenParenToken */ || token() === 17 /* OpenBraceToken */ || token() === 85 /* ExtendsKeyword */ || token() === 108 /* ImplementsKeyword */;
+                case 11 /* ArgumentExpressions */:
+                    // Tokens other than ')' are here for better error recovery
+                    return token() === 20 /* CloseParenToken */ || token() === 25 /* SemicolonToken */;
+                case 15 /* ArrayLiteralMembers */:
+                case 20 /* TupleElementTypes */:
+                case 10 /* ArrayBindingElements */:
+                    return token() === 22 /* CloseBracketToken */;
+                case 16 /* Parameters */:
+                case 17 /* RestProperties */:
+                    // Tokens other than ')' and ']' (the latter for index signatures) are here for better error recovery
+                    return token() === 20 /* CloseParenToken */ || token() === 22 /* CloseBracketToken */ /*|| token === SyntaxKind.OpenBraceToken*/;
+                case 19 /* TypeArguments */:
+                    // All other tokens should cause the type-argument to terminate except comma token
+                    return token() !== 26 /* CommaToken */;
+                case 21 /* HeritageClauses */:
+                    return token() === 17 /* OpenBraceToken */ || token() === 18 /* CloseBraceToken */;
+                case 13 /* JsxAttributes */:
+                    return token() === 29 /* GreaterThanToken */ || token() === 41 /* SlashToken */;
+                case 14 /* JsxChildren */:
+                    return token() === 27 /* LessThanToken */ && lookAhead(nextTokenIsSlash);
                 default:
                     return false;
             }
         }
         function isVariableDeclaratorListTerminator() {
+            // If we can consume a semicolon (either explicitly, or with ASI), then consider us done
+            // with parsing the list of variable declarators.
             if (canParseSemicolon()) {
                 return true;
             }
+            // in the case where we're parsing the variable declarator of a 'for-in' statement, we
+            // are done if we see an 'in' keyword in front of us. Same with for-of
             if (isInOrOfKeyword(token())) {
                 return true;
             }
-            if (token() === 36) {
+            // ERROR RECOVERY TWEAK:
+            // For better error recovery, if we see an '=>' then we just stop immediately.  We've got an
+            // arrow function here and it's going to be very unlikely that we'll resynchronize and get
+            // another variable declaration.
+            if (token() === 36 /* EqualsGreaterThanToken */) {
                 return true;
             }
+            // Keep trying to parse out variable declarators.
             return false;
         }
+        // True if positioned at element or terminator of the current list or any enclosing list
         function isInSomeParsingContext() {
-            for (var kind = 0; kind < 23; kind++) {
+            for (var kind = 0; kind < 23 /* Count */; kind++) {
                 if (parsingContext & (1 << kind)) {
-                    if (isListElement(kind, true) || isListTerminator(kind)) {
+                    if (isListElement(kind, /*inErrorRecovery*/ true) || isListTerminator(kind)) {
                         return true;
                     }
                 }
             }
             return false;
         }
+        // Parses a list of elements
         function parseList(kind, parseElement) {
             var saveParsingContext = parsingContext;
             parsingContext |= 1 << kind;
             var list = [];
             var listPos = getNodePos();
             while (!isListTerminator(kind)) {
-                if (isListElement(kind, false)) {
+                if (isListElement(kind, /*inErrorRecovery*/ false)) {
                     var element = parseListElement(kind, parseElement);
                     list.push(element);
                     continue;
@@ -13079,85 +16482,145 @@ var ts;
             return parseElement();
         }
         function currentNode(parsingContext) {
+            // If there is an outstanding parse error that we've encountered, but not attached to
+            // some node, then we cannot get a node from the old source tree.  This is because we
+            // want to mark the next node we encounter as being unusable.
+            //
+            // Note: This may be too conservative.  Perhaps we could reuse the node and set the bit
+            // on it (or its leftmost child) as having the error.  For now though, being conservative
+            // is nice and likely won't ever affect perf.
             if (parseErrorBeforeNextFinishedNode) {
                 return undefined;
             }
             if (!syntaxCursor) {
+                // if we don't have a cursor, we could never return a node from the old tree.
                 return undefined;
             }
             var node = syntaxCursor.currentNode(scanner.getStartPos());
+            // Can't reuse a missing node.
             if (ts.nodeIsMissing(node)) {
                 return undefined;
             }
+            // Can't reuse a node that intersected the change range.
             if (node.intersectsChange) {
                 return undefined;
             }
+            // Can't reuse a node that contains a parse error.  This is necessary so that we
+            // produce the same set of errors again.
             if (ts.containsParseError(node)) {
                 return undefined;
             }
-            var nodeContextFlags = node.flags & 12679168;
+            // We can only reuse a node if it was parsed under the same strict mode that we're
+            // currently in.  i.e. if we originally parsed a node in non-strict mode, but then
+            // the user added 'using strict' at the top of the file, then we can't use that node
+            // again as the presence of strict mode may cause us to parse the tokens in the file
+            // differently.
+            //
+            // Note: we *can* reuse tokens when the strict mode changes.  That's because tokens
+            // are unaffected by strict mode.  It's just the parser will decide what to do with it
+            // differently depending on what mode it is in.
+            //
+            // This also applies to all our other context flags as well.
+            var nodeContextFlags = node.flags & 12679168 /* ContextFlags */;
             if (nodeContextFlags !== contextFlags) {
                 return undefined;
             }
+            // Ok, we have a node that looks like it could be reused.  Now verify that it is valid
+            // in the current list parsing context that we're currently at.
             if (!canReuseNode(node, parsingContext)) {
                 return undefined;
             }
             if (node.jsDocCache) {
+                // jsDocCache may include tags from parent nodes, which might have been modified.
                 node.jsDocCache = undefined;
             }
             return node;
         }
         function consumeNode(node) {
+            // Move the scanner so it is after the node we just consumed.
             scanner.setTextPos(node.end);
             nextToken();
             return node;
         }
         function canReuseNode(node, parsingContext) {
             switch (parsingContext) {
-                case 5:
+                case 5 /* ClassMembers */:
                     return isReusableClassMember(node);
-                case 2:
+                case 2 /* SwitchClauses */:
                     return isReusableSwitchClause(node);
-                case 0:
-                case 1:
-                case 3:
+                case 0 /* SourceElements */:
+                case 1 /* BlockStatements */:
+                case 3 /* SwitchClauseStatements */:
                     return isReusableStatement(node);
-                case 6:
+                case 6 /* EnumMembers */:
                     return isReusableEnumMember(node);
-                case 4:
+                case 4 /* TypeMembers */:
                     return isReusableTypeMember(node);
-                case 8:
+                case 8 /* VariableDeclarations */:
                     return isReusableVariableDeclaration(node);
-                case 16:
+                case 16 /* Parameters */:
                     return isReusableParameter(node);
-                case 17:
+                case 17 /* RestProperties */:
                     return false;
-                case 21:
-                case 18:
-                case 20:
-                case 19:
-                case 11:
-                case 12:
-                case 7:
-                case 13:
-                case 14:
+                // Any other lists we do not care about reusing nodes in.  But feel free to add if
+                // you can do so safely.  Danger areas involve nodes that may involve speculative
+                // parsing.  If speculative parsing is involved with the node, then the range the
+                // parser reached while looking ahead might be in the edited range (see the example
+                // in canReuseVariableDeclaratorNode for a good case of this).
+                case 21 /* HeritageClauses */:
+                // This would probably be safe to reuse.  There is no speculative parsing with
+                // heritage clauses.
+                case 18 /* TypeParameters */:
+                // This would probably be safe to reuse.  There is no speculative parsing with
+                // type parameters.  Note that that's because type *parameters* only occur in
+                // unambiguous *type* contexts.  While type *arguments* occur in very ambiguous
+                // *expression* contexts.
+                case 20 /* TupleElementTypes */:
+                // This would probably be safe to reuse.  There is no speculative parsing with
+                // tuple types.
+                // Technically, type argument list types are probably safe to reuse.  While
+                // speculative parsing is involved with them (since type argument lists are only
+                // produced from speculative parsing a < as a type argument list), we only have
+                // the types because speculative parsing succeeded.  Thus, the lookahead never
+                // went past the end of the list and rewound.
+                case 19 /* TypeArguments */:
+                // Note: these are almost certainly not safe to ever reuse.  Expressions commonly
+                // need a large amount of lookahead, and we should not reuse them as they may
+                // have actually intersected the edit.
+                case 11 /* ArgumentExpressions */:
+                // This is not safe to reuse for the same reason as the 'AssignmentExpression'
+                // cases.  i.e. a property assignment may end with an expression, and thus might
+                // have lookahead far beyond it's old node.
+                case 12 /* ObjectLiteralMembers */:
+                // This is probably not safe to reuse.  There can be speculative parsing with
+                // type names in a heritage clause.  There can be generic names in the type
+                // name list, and there can be left hand side expressions (which can have type
+                // arguments.)
+                case 7 /* HeritageClauseElement */:
+                // Perhaps safe to reuse, but it's unlikely we'd see more than a dozen attributes
+                // on any given element. Same for children.
+                case 13 /* JsxAttributes */:
+                case 14 /* JsxChildren */:
             }
             return false;
         }
         function isReusableClassMember(node) {
             if (node) {
                 switch (node.kind) {
-                    case 155:
-                    case 160:
-                    case 156:
-                    case 157:
-                    case 152:
-                    case 212:
+                    case 155 /* Constructor */:
+                    case 160 /* IndexSignature */:
+                    case 156 /* GetAccessor */:
+                    case 157 /* SetAccessor */:
+                    case 152 /* PropertyDeclaration */:
+                    case 212 /* SemicolonClassElement */:
                         return true;
-                    case 154:
+                    case 154 /* MethodDeclaration */:
+                        // Method declarations are not necessarily reusable.  An object-literal
+                        // may have a method calls "constructor(...)" and we must reparse that
+                        // into an actual .ConstructorDeclaration.
                         var methodDeclaration = node;
-                        var nameIsConstructor = methodDeclaration.name.kind === 71 &&
-                            methodDeclaration.name.originalKeywordKind === 123;
+                        var nameIsConstructor = methodDeclaration.name.kind === 71 /* Identifier */ &&
+                            methodDeclaration.name.originalKeywordKind === 123 /* ConstructorKeyword */;
                         return !nameIsConstructor;
                 }
             }
@@ -13166,8 +16629,8 @@ var ts;
         function isReusableSwitchClause(node) {
             if (node) {
                 switch (node.kind) {
-                    case 266:
-                    case 267:
+                    case 266 /* CaseClause */:
+                    case 267 /* DefaultClause */:
                         return true;
                 }
             }
@@ -13176,70 +16639,86 @@ var ts;
         function isReusableStatement(node) {
             if (node) {
                 switch (node.kind) {
-                    case 234:
-                    case 214:
-                    case 213:
-                    case 217:
-                    case 216:
-                    case 229:
-                    case 225:
-                    case 227:
-                    case 224:
-                    case 223:
-                    case 221:
-                    case 222:
-                    case 220:
-                    case 219:
-                    case 226:
-                    case 215:
-                    case 230:
-                    case 228:
-                    case 218:
-                    case 231:
-                    case 244:
-                    case 243:
-                    case 250:
-                    case 249:
-                    case 239:
-                    case 235:
-                    case 236:
-                    case 238:
-                    case 237:
+                    case 234 /* FunctionDeclaration */:
+                    case 214 /* VariableStatement */:
+                    case 213 /* Block */:
+                    case 217 /* IfStatement */:
+                    case 216 /* ExpressionStatement */:
+                    case 229 /* ThrowStatement */:
+                    case 225 /* ReturnStatement */:
+                    case 227 /* SwitchStatement */:
+                    case 224 /* BreakStatement */:
+                    case 223 /* ContinueStatement */:
+                    case 221 /* ForInStatement */:
+                    case 222 /* ForOfStatement */:
+                    case 220 /* ForStatement */:
+                    case 219 /* WhileStatement */:
+                    case 226 /* WithStatement */:
+                    case 215 /* EmptyStatement */:
+                    case 230 /* TryStatement */:
+                    case 228 /* LabeledStatement */:
+                    case 218 /* DoStatement */:
+                    case 231 /* DebuggerStatement */:
+                    case 244 /* ImportDeclaration */:
+                    case 243 /* ImportEqualsDeclaration */:
+                    case 250 /* ExportDeclaration */:
+                    case 249 /* ExportAssignment */:
+                    case 239 /* ModuleDeclaration */:
+                    case 235 /* ClassDeclaration */:
+                    case 236 /* InterfaceDeclaration */:
+                    case 238 /* EnumDeclaration */:
+                    case 237 /* TypeAliasDeclaration */:
                         return true;
                 }
             }
             return false;
         }
         function isReusableEnumMember(node) {
-            return node.kind === 273;
+            return node.kind === 273 /* EnumMember */;
         }
         function isReusableTypeMember(node) {
             if (node) {
                 switch (node.kind) {
-                    case 159:
-                    case 153:
-                    case 160:
-                    case 151:
-                    case 158:
+                    case 159 /* ConstructSignature */:
+                    case 153 /* MethodSignature */:
+                    case 160 /* IndexSignature */:
+                    case 151 /* PropertySignature */:
+                    case 158 /* CallSignature */:
                         return true;
                 }
             }
             return false;
         }
         function isReusableVariableDeclaration(node) {
-            if (node.kind !== 232) {
+            if (node.kind !== 232 /* VariableDeclaration */) {
                 return false;
             }
+            // Very subtle incremental parsing bug.  Consider the following code:
+            //
+            //      let v = new List < A, B
+            //
+            // This is actually legal code.  It's a list of variable declarators "v = new List<A"
+            // on one side and "B" on the other. If you then change that to:
+            //
+            //      let v = new List < A, B >()
+            //
+            // then we have a problem.  "v = new List<A" doesn't intersect the change range, so we
+            // start reparsing at "B" and we completely fail to handle this properly.
+            //
+            // In order to prevent this, we do not allow a variable declarator to be reused if it
+            // has an initializer.
             var variableDeclarator = node;
             return variableDeclarator.initializer === undefined;
         }
         function isReusableParameter(node) {
-            if (node.kind !== 149) {
+            if (node.kind !== 149 /* Parameter */) {
                 return false;
             }
+            // See the comment in isReusableVariableDeclaration for why we do this.
             var parameter = node;
             return parameter.initializer === undefined;
         }
+        // Returns true if we should abort parsing.
         function abortParsingListOrMoveToNextToken(kind) {
             parseErrorAtCurrentToken(parsingContextErrors(kind));
             if (isInSomeParsingContext()) {
@@ -13250,55 +16729,68 @@ var ts;
         }
         function parsingContextErrors(context) {
             switch (context) {
-                case 0: return ts.Diagnostics.Declaration_or_statement_expected;
-                case 1: return ts.Diagnostics.Declaration_or_statement_expected;
-                case 2: return ts.Diagnostics.case_or_default_expected;
-                case 3: return ts.Diagnostics.Statement_expected;
-                case 17:
-                case 4: return ts.Diagnostics.Property_or_signature_expected;
-                case 5: return ts.Diagnostics.Unexpected_token_A_constructor_method_accessor_or_property_was_expected;
-                case 6: return ts.Diagnostics.Enum_member_expected;
-                case 7: return ts.Diagnostics.Expression_expected;
-                case 8: return ts.Diagnostics.Variable_declaration_expected;
-                case 9: return ts.Diagnostics.Property_destructuring_pattern_expected;
-                case 10: return ts.Diagnostics.Array_element_destructuring_pattern_expected;
-                case 11: return ts.Diagnostics.Argument_expression_expected;
-                case 12: return ts.Diagnostics.Property_assignment_expected;
-                case 15: return ts.Diagnostics.Expression_or_comma_expected;
-                case 16: return ts.Diagnostics.Parameter_declaration_expected;
-                case 18: return ts.Diagnostics.Type_parameter_declaration_expected;
-                case 19: return ts.Diagnostics.Type_argument_expected;
-                case 20: return ts.Diagnostics.Type_expected;
-                case 21: return ts.Diagnostics.Unexpected_token_expected;
-                case 22: return ts.Diagnostics.Identifier_expected;
-                case 13: return ts.Diagnostics.Identifier_expected;
-                case 14: return ts.Diagnostics.Identifier_expected;
-                default: return undefined;
+                case 0 /* SourceElements */: return ts.Diagnostics.Declaration_or_statement_expected;
+                case 1 /* BlockStatements */: return ts.Diagnostics.Declaration_or_statement_expected;
+                case 2 /* SwitchClauses */: return ts.Diagnostics.case_or_default_expected;
+                case 3 /* SwitchClauseStatements */: return ts.Diagnostics.Statement_expected;
+                case 17 /* RestProperties */: // fallthrough
+                case 4 /* TypeMembers */: return ts.Diagnostics.Property_or_signature_expected;
+                case 5 /* ClassMembers */: return ts.Diagnostics.Unexpected_token_A_constructor_method_accessor_or_property_was_expected;
+                case 6 /* EnumMembers */: return ts.Diagnostics.Enum_member_expected;
+                case 7 /* HeritageClauseElement */: return ts.Diagnostics.Expression_expected;
+                case 8 /* VariableDeclarations */: return ts.Diagnostics.Variable_declaration_expected;
+                case 9 /* ObjectBindingElements */: return ts.Diagnostics.Property_destructuring_pattern_expected;
+                case 10 /* ArrayBindingElements */: return ts.Diagnostics.Array_element_destructuring_pattern_expected;
+                case 11 /* ArgumentExpressions */: return ts.Diagnostics.Argument_expression_expected;
+                case 12 /* ObjectLiteralMembers */: return ts.Diagnostics.Property_assignment_expected;
+                case 15 /* ArrayLiteralMembers */: return ts.Diagnostics.Expression_or_comma_expected;
+                case 16 /* Parameters */: return ts.Diagnostics.Parameter_declaration_expected;
+                case 18 /* TypeParameters */: return ts.Diagnostics.Type_parameter_declaration_expected;
+                case 19 /* TypeArguments */: return ts.Diagnostics.Type_argument_expected;
+                case 20 /* TupleElementTypes */: return ts.Diagnostics.Type_expected;
+                case 21 /* HeritageClauses */: return ts.Diagnostics.Unexpected_token_expected;
+                case 22 /* ImportOrExportSpecifiers */: return ts.Diagnostics.Identifier_expected;
+                case 13 /* JsxAttributes */: return ts.Diagnostics.Identifier_expected;
+                case 14 /* JsxChildren */: return ts.Diagnostics.Identifier_expected;
+                default: return undefined; // TODO: GH#18217 `default: Debug.assertNever(context);`
             }
         }
+        // Parses a comma-delimited list of elements
         function parseDelimitedList(kind, parseElement, considerSemicolonAsDelimiter) {
             var saveParsingContext = parsingContext;
             parsingContext |= 1 << kind;
             var list = [];
             var listPos = getNodePos();
-            var commaStart = -1;
+            var commaStart = -1; // Meaning the previous token was not a comma
             while (true) {
-                if (isListElement(kind, false)) {
+                if (isListElement(kind, /*inErrorRecovery*/ false)) {
                     var startPos = scanner.getStartPos();
                     list.push(parseListElement(kind, parseElement));
                     commaStart = scanner.getTokenPos();
-                    if (parseOptional(26)) {
+                    if (parseOptional(26 /* CommaToken */)) {
+                        // No need to check for a zero length node since we know we parsed a comma
                         continue;
                     }
-                    commaStart = -1;
+                    commaStart = -1; // Back to the state where the last token was not a comma
                     if (isListTerminator(kind)) {
                         break;
                     }
-                    parseExpected(26);
-                    if (considerSemicolonAsDelimiter && token() === 25 && !scanner.hasPrecedingLineBreak()) {
+                    // We didn't get a comma, and the list wasn't terminated, explicitly parse
+                    // out a comma so we give a good error message.
+                    parseExpected(26 /* CommaToken */);
+                    // If the token was a semicolon, and the caller allows that, then skip it and
+                    // continue.  This ensures we get back on track and don't result in tons of
+                    // parse errors.  For example, this can happen when people do things like use
+                    // a semicolon to delimit object literal members.   Note: we'll have already
+                    // reported an error when we called parseExpected above.
+                    if (considerSemicolonAsDelimiter && token() === 25 /* SemicolonToken */ && !scanner.hasPrecedingLineBreak()) {
                         nextToken();
                     }
                     if (startPos === scanner.getStartPos()) {
+                        // What we're parsing isn't actually remotely recognizable as a element and we've consumed no tokens whatsoever
+                        // Consume a token to advance the parser in some way and avoid an infinite loop
+                        // This can happen when we're speculatively parsing parenthesized expressions which we think may be arrow functions,
+                        // or when a modifier keyword which is disallowed as a parameter name (ie, `static` in strict mode) is supplied
                         nextToken();
                     }
                     continue;
@@ -13312,7 +16804,13 @@ var ts;
             }
             parsingContext = saveParsingContext;
             var result = createNodeArray(list, listPos);
+            // Recording the trailing comma is deliberately done after the previous
+            // loop, and not just if we see a list terminator. This is because the list
+            // may have ended incorrectly, but it is still important to know if there
+            // was a trailing comma.
+            // Check if the last token was a comma.
             if (commaStart >= 0) {
+                // Always preserve a trailing comma by marking it on the NodeArray
                 result.hasTrailingComma = true;
             }
             return result;
@@ -13331,8 +16829,9 @@ var ts;
         function parseEntityName(allowReservedWords, diagnosticMessage) {
             var entity = allowReservedWords ? parseIdentifierName(diagnosticMessage) : parseIdentifier(diagnosticMessage);
             var dotPos = scanner.getStartPos();
-            while (parseOptional(23)) {
-                if (token() === 27) {
+            while (parseOptional(23 /* DotToken */)) {
+                if (token() === 27 /* LessThanToken */) {
+                    // the entity is part of a JSDoc-style generic, so record the trailing dot for later error reporting
                     entity.jsdocDotPos = dotPos;
                     break;
                 }
@@ -13342,42 +16841,64 @@ var ts;
             return entity;
         }
         function createQualifiedName(entity, name) {
-            var node = createNode(146, entity.pos);
+            var node = createNode(146 /* QualifiedName */, entity.pos);
             node.left = entity;
             node.right = name;
             return finishNode(node);
         }
         function parseRightSideOfDot(allowIdentifierNames) {
+            // Technically a keyword is valid here as all identifiers and keywords are identifier names.
+            // However, often we'll encounter this in error situations when the identifier or keyword
+            // is actually starting another valid construct.
+            //
+            // So, we check for the following specific case:
+            //
+            //      name.
+            //      identifierOrKeyword identifierNameOrKeyword
+            //
+            // Note: the newlines are important here.  For example, if that above code
+            // were rewritten into:
+            //
+            //      name.identifierOrKeyword
+            //      identifierNameOrKeyword
+            //
+            // Then we would consider it valid.  That's because ASI would take effect and
+            // the code would be implicitly: "name.identifierOrKeyword; identifierNameOrKeyword".
+            // In the first case though, ASI will not take effect because there is not a
+            // line terminator after the identifier or keyword.
             if (scanner.hasPrecedingLineBreak() && ts.tokenIsIdentifierOrKeyword(token())) {
                 var matchesPattern = lookAhead(nextTokenIsIdentifierOrKeywordOnSameLine);
                 if (matchesPattern) {
-                    return createMissingNode(71, true, ts.Diagnostics.Identifier_expected);
+                    // Report that we need an identifier.  However, report it right after the dot,
+                    // and not on the next token.  This is because the next token might actually
+                    // be an identifier and the error would be quite confusing.
+                    return createMissingNode(71 /* Identifier */, /*reportAtCurrentPosition*/ true, ts.Diagnostics.Identifier_expected);
                 }
             }
             return allowIdentifierNames ? parseIdentifierName() : parseIdentifier();
         }
         function parseTemplateExpression() {
-            var template = createNode(202);
+            var template = createNode(202 /* TemplateExpression */);
             template.head = parseTemplateHead();
-            ts.Debug.assert(template.head.kind === 14, "Template head has wrong token kind");
+            ts.Debug.assert(template.head.kind === 14 /* TemplateHead */, "Template head has wrong token kind");
             var list = [];
             var listPos = getNodePos();
             do {
                 list.push(parseTemplateSpan());
-            } while (ts.last(list).literal.kind === 15);
+            } while (ts.last(list).literal.kind === 15 /* TemplateMiddle */);
             template.templateSpans = createNodeArray(list, listPos);
             return finishNode(template);
         }
         function parseTemplateSpan() {
-            var span = createNode(211);
+            var span = createNode(211 /* TemplateSpan */);
             span.expression = allowInAnd(parseExpression);
             var literal;
-            if (token() === 18) {
+            if (token() === 18 /* CloseBraceToken */) {
                 reScanTemplateToken();
                 literal = parseTemplateMiddleOrTemplateTail();
             }
             else {
-                literal = parseExpectedToken(16, ts.Diagnostics._0_expected, ts.tokenToString(18));
+                literal = parseExpectedToken(16 /* TemplateTail */, ts.Diagnostics._0_expected, ts.tokenToString(18 /* CloseBraceToken */));
             }
             span.literal = literal;
             return finishNode(span);
@@ -13387,12 +16908,12 @@ var ts;
         }
         function parseTemplateHead() {
             var fragment = parseLiteralLikeNode(token());
-            ts.Debug.assert(fragment.kind === 14, "Template head has wrong token kind");
+            ts.Debug.assert(fragment.kind === 14 /* TemplateHead */, "Template head has wrong token kind");
             return fragment;
         }
         function parseTemplateMiddleOrTemplateTail() {
             var fragment = parseLiteralLikeNode(token());
-            ts.Debug.assert(fragment.kind === 15 || fragment.kind === 16, "Template fragment has wrong token kind");
+            ts.Debug.assert(fragment.kind === 15 /* TemplateMiddle */ || fragment.kind === 16 /* TemplateTail */, "Template fragment has wrong token kind");
             return fragment;
         }
         function parseLiteralLikeNode(kind) {
@@ -13405,37 +16926,61 @@ var ts;
             if (scanner.isUnterminated()) {
                 node.isUnterminated = true;
             }
-            if (node.kind === 8) {
-                node.numericLiteralFlags = scanner.getTokenFlags() & 1008;
+            // Octal literals are not allowed in strict mode or ES5
+            // Note that theoretically the following condition would hold true literals like 009,
+            // which is not octal.But because of how the scanner separates the tokens, we would
+            // never get a token like this. Instead, we would get 00 and 9 as two separate tokens.
+            // We also do not need to check for negatives because any prefix operator would be part of a
+            // parent unary expression.
+            if (node.kind === 8 /* NumericLiteral */) {
+                node.numericLiteralFlags = scanner.getTokenFlags() & 1008 /* NumericLiteralFlags */;
             }
             nextToken();
             finishNode(node);
             return node;
         }
+        // TYPES
         function parseTypeReference() {
-            var node = createNode(162);
-            node.typeName = parseEntityName(true, ts.Diagnostics.Type_expected);
-            if (!scanner.hasPrecedingLineBreak() && token() === 27) {
-                node.typeArguments = parseBracketedList(19, parseType, 27, 29);
+            var node = createNode(162 /* TypeReference */);
+            node.typeName = parseEntityName(/*allowReservedWords*/ true, ts.Diagnostics.Type_expected);
+            if (!scanner.hasPrecedingLineBreak() && token() === 27 /* LessThanToken */) {
+                node.typeArguments = parseBracketedList(19 /* TypeArguments */, parseType, 27 /* LessThanToken */, 29 /* GreaterThanToken */);
             }
             return finishNode(node);
         }
+        // If true, we should abort parsing an error function.
+        function typeHasArrowFunctionBlockingParseError(node) {
+            switch (node.kind) {
+                case 162 /* TypeReference */:
+                    return ts.nodeIsMissing(node.typeName);
+                case 163 /* FunctionType */:
+                case 164 /* ConstructorType */: {
+                    var _a = node, parameters = _a.parameters, type = _a.type;
+                    // parameters.pos === parameters.end only if we used parseMissingList, else should contain at least `()`
+                    return parameters.pos === parameters.end || typeHasArrowFunctionBlockingParseError(type);
+                }
+                case 173 /* ParenthesizedType */:
+                    return typeHasArrowFunctionBlockingParseError(node.type);
+                default:
+                    return false;
+            }
+        }
         function parseThisTypePredicate(lhs) {
             nextToken();
-            var node = createNode(161, lhs.pos);
+            var node = createNode(161 /* TypePredicate */, lhs.pos);
             node.parameterName = lhs;
             node.type = parseType();
             return finishNode(node);
         }
         function parseThisTypeNode() {
-            var node = createNode(174);
+            var node = createNode(174 /* ThisType */);
             nextToken();
             return finishNode(node);
         }
         function parseJSDocAllType(postFixEquals) {
-            var result = createNode(279);
+            var result = createNode(279 /* JSDocAllType */);
             if (postFixEquals) {
-                return createJSDocPostfixType(283, result);
+                return createJSDocPostfixType(283 /* JSDocOptionalType */, result);
             }
             else {
                 nextToken();
@@ -13443,184 +16988,252 @@ var ts;
             return finishNode(result);
         }
         function parseJSDocNonNullableType() {
-            var result = createNode(282);
+            var result = createNode(282 /* JSDocNonNullableType */);
             nextToken();
             result.type = parseNonArrayType();
             return finishNode(result);
         }
         function parseJSDocUnknownOrNullableType() {
             var pos = scanner.getStartPos();
+            // skip the ?
             nextToken();
-            if (token() === 26 ||
-                token() === 18 ||
-                token() === 20 ||
-                token() === 29 ||
-                token() === 58 ||
-                token() === 49) {
-                var result = createNode(280, pos);
+            // Need to lookahead to decide if this is a nullable or unknown type.
+            // Here are cases where we'll pick the unknown type:
+            //
+            //      Foo(?,
+            //      { a: ? }
+            //      Foo(?)
+            //      Foo<?>
+            //      Foo(?=
+            //      (?|
+            if (token() === 26 /* CommaToken */ ||
+                token() === 18 /* CloseBraceToken */ ||
+                token() === 20 /* CloseParenToken */ ||
+                token() === 29 /* GreaterThanToken */ ||
+                token() === 58 /* EqualsToken */ ||
+                token() === 49 /* BarToken */) {
+                var result = createNode(280 /* JSDocUnknownType */, pos);
                 return finishNode(result);
             }
             else {
-                var result = createNode(281, pos);
+                var result = createNode(281 /* JSDocNullableType */, pos);
                 result.type = parseType();
                 return finishNode(result);
             }
         }
         function parseJSDocFunctionType() {
             if (lookAhead(nextTokenIsOpenParen)) {
-                var result = createNodeWithJSDoc(284);
+                var result = createNodeWithJSDoc(284 /* JSDocFunctionType */);
                 nextToken();
-                fillSignature(56, 4 | 32, result);
+                fillSignature(56 /* ColonToken */, 4 /* Type */ | 32 /* JSDoc */, result);
                 return finishNode(result);
             }
-            var node = createNode(162);
+            var node = createNode(162 /* TypeReference */);
             node.typeName = parseIdentifierName();
             return finishNode(node);
         }
         function parseJSDocParameter() {
-            var parameter = createNode(149);
-            if (token() === 99 || token() === 94) {
+            var parameter = createNode(149 /* Parameter */);
+            if (token() === 99 /* ThisKeyword */ || token() === 94 /* NewKeyword */) {
                 parameter.name = parseIdentifierName();
-                parseExpected(56);
+                parseExpected(56 /* ColonToken */);
             }
             parameter.type = parseJSDocType();
             return finishNode(parameter);
         }
         function parseJSDocType() {
-            var dotdotdot = parseOptionalToken(24);
+            var dotdotdot = parseOptionalToken(24 /* DotDotDotToken */);
             var type = parseType();
             if (dotdotdot) {
-                var variadic = createNode(285, dotdotdot.pos);
+                var variadic = createNode(285 /* JSDocVariadicType */, dotdotdot.pos);
                 variadic.type = type;
                 type = finishNode(variadic);
             }
-            if (token() === 58) {
-                return createJSDocPostfixType(283, type);
+            if (token() === 58 /* EqualsToken */) {
+                return createJSDocPostfixType(283 /* JSDocOptionalType */, type);
             }
             return type;
         }
         function parseTypeQuery() {
-            var node = createNode(165);
-            parseExpected(103);
-            node.exprName = parseEntityName(true);
+            var node = createNode(165 /* TypeQuery */);
+            parseExpected(103 /* TypeOfKeyword */);
+            node.exprName = parseEntityName(/*allowReservedWords*/ true);
             return finishNode(node);
         }
         function parseTypeParameter() {
-            var node = createNode(148);
+            var node = createNode(148 /* TypeParameter */);
             node.name = parseIdentifier();
-            if (parseOptional(85)) {
+            if (parseOptional(85 /* ExtendsKeyword */)) {
+                // It's not uncommon for people to write improper constraints to a generic.  If the
+                // user writes a constraint that is an expression and not an actual type, then parse
+                // it out as an expression (so we can recover well), but report that a type is needed
+                // instead.
                 if (isStartOfType() || !isStartOfExpression()) {
                     node.constraint = parseType();
                 }
                 else {
+                    // It was not a type, and it looked like an expression.  Parse out an expression
+                    // here so we recover well.  Note: it is important that we call parseUnaryExpression
+                    // and not parseExpression here.  If the user has:
+                    //
+                    //      <T extends "">
+                    //
+                    // We do *not* want to consume the `>` as we're consuming the expression for "".
                     node.expression = parseUnaryExpressionOrHigher();
                 }
             }
-            if (parseOptional(58)) {
+            if (parseOptional(58 /* EqualsToken */)) {
                 node.default = parseType();
             }
             return finishNode(node);
         }
         function parseTypeParameters() {
-            if (token() === 27) {
-                return parseBracketedList(18, parseTypeParameter, 27, 29);
+            if (token() === 27 /* LessThanToken */) {
+                return parseBracketedList(18 /* TypeParameters */, parseTypeParameter, 27 /* LessThanToken */, 29 /* GreaterThanToken */);
             }
         }
         function parseParameterType() {
-            if (parseOptional(56)) {
+            if (parseOptional(56 /* ColonToken */)) {
                 return parseType();
             }
             return undefined;
         }
         function isStartOfParameter() {
-            return token() === 24 ||
+            return token() === 24 /* DotDotDotToken */ ||
                 isIdentifierOrPattern() ||
                 ts.isModifierKind(token()) ||
-                token() === 57 ||
-                isStartOfType(true);
+                token() === 57 /* AtToken */ ||
+                isStartOfType(/*inStartOfParameter*/ true);
         }
         function parseParameter() {
-            var node = createNodeWithJSDoc(149);
-            if (token() === 99) {
-                node.name = createIdentifier(true);
+            var node = createNodeWithJSDoc(149 /* Parameter */);
+            if (token() === 99 /* ThisKeyword */) {
+                node.name = createIdentifier(/*isIdentifier*/ true);
                 node.type = parseParameterType();
                 return finishNode(node);
             }
             node.decorators = parseDecorators();
             node.modifiers = parseModifiers();
-            node.dotDotDotToken = parseOptionalToken(24);
+            node.dotDotDotToken = parseOptionalToken(24 /* DotDotDotToken */);
+            // FormalParameter [Yield,Await]:
+            //      BindingElement[?Yield,?Await]
             node.name = parseIdentifierOrPattern();
             if (ts.getFullWidth(node.name) === 0 && !ts.hasModifiers(node) && ts.isModifierKind(token())) {
+                // in cases like
+                // 'use strict'
+                // function foo(static)
+                // isParameter('static') === true, because of isModifier('static')
+                // however 'static' is not a legal identifier in a strict mode.
+                // so result of this function will be ParameterDeclaration (flags = 0, name = missing, type = undefined, initializer = undefined)
+                // and current token will not change => parsing of the enclosing parameter list will last till the end of time (or OOM)
+                // to avoid this we'll advance cursor to the next token.
                 nextToken();
             }
-            node.questionToken = parseOptionalToken(55);
+            node.questionToken = parseOptionalToken(55 /* QuestionToken */);
             node.type = parseParameterType();
             node.initializer = parseInitializer();
             return finishNode(node);
         }
+        /**
+         * Note: If returnToken is EqualsGreaterThanToken, `signature.type` will always be defined.
+         * @returns If return type parsing succeeds
+         */
         function fillSignature(returnToken, flags, signature) {
-            if (!(flags & 32)) {
+            if (!(flags & 32 /* JSDoc */)) {
                 signature.typeParameters = parseTypeParameters();
             }
-            signature.parameters = parseParameterList(flags);
-            if (shouldParseReturnType(returnToken, !!(flags & 4))) {
+            var parametersParsedSuccessfully = parseParameterList(signature, flags);
+            if (shouldParseReturnType(returnToken, !!(flags & 4 /* Type */))) {
                 signature.type = parseTypeOrTypePredicate();
-                return signature.type !== undefined;
+                if (typeHasArrowFunctionBlockingParseError(signature.type))
+                    return false;
             }
-            return true;
+            return parametersParsedSuccessfully;
         }
         function shouldParseReturnType(returnToken, isType) {
-            if (returnToken === 36) {
+            if (returnToken === 36 /* EqualsGreaterThanToken */) {
                 parseExpected(returnToken);
                 return true;
             }
-            else if (parseOptional(56)) {
+            else if (parseOptional(56 /* ColonToken */)) {
                 return true;
             }
-            else if (isType && token() === 36) {
-                parseErrorAtCurrentToken(ts.Diagnostics._0_expected, ts.tokenToString(56));
+            else if (isType && token() === 36 /* EqualsGreaterThanToken */) {
+                // This is easy to get backward, especially in type contexts, so parse the type anyway
+                parseErrorAtCurrentToken(ts.Diagnostics._0_expected, ts.tokenToString(56 /* ColonToken */));
                 nextToken();
                 return true;
             }
             return false;
         }
-        function parseParameterList(flags) {
-            if (parseExpected(19)) {
-                var savedYieldContext = inYieldContext();
-                var savedAwaitContext = inAwaitContext();
-                setYieldContext(!!(flags & 1));
-                setAwaitContext(!!(flags & 2));
-                var result = parseDelimitedList(16, flags & 32 ? parseJSDocParameter : parseParameter);
-                setYieldContext(savedYieldContext);
-                setAwaitContext(savedAwaitContext);
-                if (!parseExpected(20) && (flags & 8)) {
-                    return undefined;
-                }
-                return result;
+        // Returns true on success.
+        function parseParameterList(signature, flags) {
+            // FormalParameters [Yield,Await]: (modified)
+            //      [empty]
+            //      FormalParameterList[?Yield,Await]
+            //
+            // FormalParameter[Yield,Await]: (modified)
+            //      BindingElement[?Yield,Await]
+            //
+            // BindingElement [Yield,Await]: (modified)
+            //      SingleNameBinding[?Yield,?Await]
+            //      BindingPattern[?Yield,?Await]Initializer [In, ?Yield,?Await] opt
+            //
+            // SingleNameBinding [Yield,Await]:
+            //      BindingIdentifier[?Yield,?Await]Initializer [In, ?Yield,?Await] opt
+            if (!parseExpected(19 /* OpenParenToken */)) {
+                signature.parameters = createMissingList();
+                return false;
             }
-            return (flags & 8) ? undefined : createMissingList();
+            var savedYieldContext = inYieldContext();
+            var savedAwaitContext = inAwaitContext();
+            setYieldContext(!!(flags & 1 /* Yield */));
+            setAwaitContext(!!(flags & 2 /* Await */));
+            signature.parameters = parseDelimitedList(16 /* Parameters */, flags & 32 /* JSDoc */ ? parseJSDocParameter : parseParameter);
+            setYieldContext(savedYieldContext);
+            setAwaitContext(savedAwaitContext);
+            return parseExpected(20 /* CloseParenToken */);
         }
         function parseTypeMemberSemicolon() {
-            if (parseOptional(26)) {
+            // We allow type members to be separated by commas or (possibly ASI) semicolons.
+            // First check if it was a comma.  If so, we're done with the member.
+            if (parseOptional(26 /* CommaToken */)) {
                 return;
             }
+            // Didn't have a comma.  We must have a (possible ASI) semicolon.
             parseSemicolon();
         }
         function parseSignatureMember(kind) {
             var node = createNodeWithJSDoc(kind);
-            if (kind === 159) {
-                parseExpected(94);
+            if (kind === 159 /* ConstructSignature */) {
+                parseExpected(94 /* NewKeyword */);
             }
-            fillSignature(56, 4, node);
+            fillSignature(56 /* ColonToken */, 4 /* Type */, node);
             parseTypeMemberSemicolon();
             return finishNode(node);
         }
         function isIndexSignature() {
-            return token() === 21 && lookAhead(isUnambiguouslyIndexSignature);
+            return token() === 21 /* OpenBracketToken */ && lookAhead(isUnambiguouslyIndexSignature);
         }
         function isUnambiguouslyIndexSignature() {
+            // The only allowed sequence is:
+            //
+            //   [id:
+            //
+            // However, for error recovery, we also check the following cases:
+            //
+            //   [...
+            //   [id,
+            //   [id?,
+            //   [id?:
+            //   [id?]
+            //   [public id
+            //   [private id
+            //   [protected id
+            //   []
+            //
             nextToken();
-            if (token() === 24 || token() === 22) {
+            if (token() === 24 /* DotDotDotToken */ || token() === 22 /* CloseBracketToken */) {
                 return true;
             }
             if (ts.isModifierKind(token())) {
@@ -13633,35 +17246,48 @@ var ts;
                 return false;
             }
             else {
+                // Skip the identifier
                 nextToken();
             }
-            if (token() === 56 || token() === 26) {
+            // A colon signifies a well formed indexer
+            // A comma should be a badly formed indexer because comma expressions are not allowed
+            // in computed properties.
+            if (token() === 56 /* ColonToken */ || token() === 26 /* CommaToken */) {
                 return true;
             }
-            if (token() !== 55) {
+            // Question mark could be an indexer with an optional property,
+            // or it could be a conditional expression in a computed property.
+            if (token() !== 55 /* QuestionToken */) {
                 return false;
             }
+            // If any of the following tokens are after the question mark, it cannot
+            // be a conditional expression, so treat it as an indexer.
             nextToken();
-            return token() === 56 || token() === 26 || token() === 22;
+            return token() === 56 /* ColonToken */ || token() === 26 /* CommaToken */ || token() === 22 /* CloseBracketToken */;
         }
         function parseIndexSignatureDeclaration(node) {
-            node.kind = 160;
-            node.parameters = parseBracketedList(16, parseParameter, 21, 22);
+            node.kind = 160 /* IndexSignature */;
+            node.parameters = parseBracketedList(16 /* Parameters */, parseParameter, 21 /* OpenBracketToken */, 22 /* CloseBracketToken */);
             node.type = parseTypeAnnotation();
             parseTypeMemberSemicolon();
             return finishNode(node);
         }
         function parsePropertyOrMethodSignature(node) {
             node.name = parsePropertyName();
-            node.questionToken = parseOptionalToken(55);
-            if (token() === 19 || token() === 27) {
-                node.kind = 153;
-                fillSignature(56, 4, node);
+            node.questionToken = parseOptionalToken(55 /* QuestionToken */);
+            if (token() === 19 /* OpenParenToken */ || token() === 27 /* LessThanToken */) {
+                node.kind = 153 /* MethodSignature */;
+                // Method signatures don't exist in expression contexts.  So they have neither
+                // [Yield] nor [Await]
+                fillSignature(56 /* ColonToken */, 4 /* Type */, node);
             }
             else {
-                node.kind = 151;
+                node.kind = 151 /* PropertySignature */;
                 node.type = parseTypeAnnotation();
-                if (token() === 58) {
+                if (token() === 58 /* EqualsToken */) {
+                    // Although type literal properties cannot not have initializers, we attempt
+                    // to parse an initializer so we can report in the checker that an interface
+                    // property or type literal property cannot have an initializer.
                     node.initializer = parseInitializer();
                 }
             }
@@ -13669,39 +17295,45 @@ var ts;
             return finishNode(node);
         }
         function isTypeMemberStart() {
-            if (token() === 19 || token() === 27) {
+            // Return true if we have the start of a signature member
+            if (token() === 19 /* OpenParenToken */ || token() === 27 /* LessThanToken */) {
                 return true;
             }
             var idToken = false;
+            // Eat up all modifiers, but hold on to the last one in case it is actually an identifier
             while (ts.isModifierKind(token())) {
                 idToken = true;
                 nextToken();
             }
-            if (token() === 21) {
+            // Index signatures and computed property names are type members
+            if (token() === 21 /* OpenBracketToken */) {
                 return true;
             }
+            // Try to get the first property-like token following all modifiers
             if (isLiteralPropertyName()) {
                 idToken = true;
                 nextToken();
             }
+            // If we were able to get any potential identifier, check that it is
+            // the start of a member declaration
             if (idToken) {
-                return token() === 19 ||
-                    token() === 27 ||
-                    token() === 55 ||
-                    token() === 56 ||
-                    token() === 26 ||
+                return token() === 19 /* OpenParenToken */ ||
+                    token() === 27 /* LessThanToken */ ||
+                    token() === 55 /* QuestionToken */ ||
+                    token() === 56 /* ColonToken */ ||
+                    token() === 26 /* CommaToken */ ||
                     canParseSemicolon();
             }
             return false;
         }
         function parseTypeMember() {
-            if (token() === 19 || token() === 27) {
-                return parseSignatureMember(158);
+            if (token() === 19 /* OpenParenToken */ || token() === 27 /* LessThanToken */) {
+                return parseSignatureMember(158 /* CallSignature */);
             }
-            if (token() === 94 && lookAhead(nextTokenIsOpenParenOrLessThan)) {
-                return parseSignatureMember(159);
+            if (token() === 94 /* NewKeyword */ && lookAhead(nextTokenIsOpenParenOrLessThan)) {
+                return parseSignatureMember(159 /* ConstructSignature */);
             }
-            var node = createNodeWithJSDoc(0);
+            var node = createNodeWithJSDoc(0 /* Unknown */);
             node.modifiers = parseModifiers();
             if (isIndexSignature()) {
                 return parseIndexSignatureDeclaration(node);
@@ -13710,30 +17342,30 @@ var ts;
         }
         function nextTokenIsOpenParenOrLessThan() {
             nextToken();
-            return token() === 19 || token() === 27;
+            return token() === 19 /* OpenParenToken */ || token() === 27 /* LessThanToken */;
         }
         function nextTokenIsDot() {
-            return nextToken() === 23;
+            return nextToken() === 23 /* DotToken */;
         }
         function nextTokenIsOpenParenOrLessThanOrDot() {
             switch (nextToken()) {
-                case 19:
-                case 27:
-                case 23:
+                case 19 /* OpenParenToken */:
+                case 27 /* LessThanToken */:
+                case 23 /* DotToken */:
                     return true;
             }
             return false;
         }
         function parseTypeLiteral() {
-            var node = createNode(166);
+            var node = createNode(166 /* TypeLiteral */);
             node.members = parseObjectTypeMembers();
             return finishNode(node);
         }
         function parseObjectTypeMembers() {
             var members;
-            if (parseExpected(17)) {
-                members = parseList(4, parseTypeMember);
-                parseExpected(18);
+            if (parseExpected(17 /* OpenBraceToken */)) {
+                members = parseList(4 /* TypeMembers */, parseTypeMember);
+                parseExpected(18 /* CloseBraceToken */);
             }
             else {
                 members = createMissingList();
@@ -13742,85 +17374,76 @@ var ts;
         }
         function isStartOfMappedType() {
             nextToken();
-            if (token() === 37 || token() === 38) {
-                return nextToken() === 132;
+            if (token() === 37 /* PlusToken */ || token() === 38 /* MinusToken */) {
+                return nextToken() === 132 /* ReadonlyKeyword */;
             }
-            if (token() === 132) {
+            if (token() === 132 /* ReadonlyKeyword */) {
                 nextToken();
             }
-            return token() === 21 && nextTokenIsIdentifier() && nextToken() === 92;
+            return token() === 21 /* OpenBracketToken */ && nextTokenIsIdentifier() && nextToken() === 92 /* InKeyword */;
         }
         function parseMappedTypeParameter() {
-            var node = createNode(148);
+            var node = createNode(148 /* TypeParameter */);
             node.name = parseIdentifier();
-            parseExpected(92);
+            parseExpected(92 /* InKeyword */);
             node.constraint = parseType();
             return finishNode(node);
         }
         function parseMappedType() {
-            var node = createNode(177);
-            parseExpected(17);
-            if (token() === 132 || token() === 37 || token() === 38) {
+            var node = createNode(177 /* MappedType */);
+            parseExpected(17 /* OpenBraceToken */);
+            if (token() === 132 /* ReadonlyKeyword */ || token() === 37 /* PlusToken */ || token() === 38 /* MinusToken */) {
                 node.readonlyToken = parseTokenNode();
-                if (node.readonlyToken.kind !== 132) {
-                    parseExpectedToken(132);
+                if (node.readonlyToken.kind !== 132 /* ReadonlyKeyword */) {
+                    parseExpectedToken(132 /* ReadonlyKeyword */);
                 }
             }
-            parseExpected(21);
+            parseExpected(21 /* OpenBracketToken */);
             node.typeParameter = parseMappedTypeParameter();
-            parseExpected(22);
-            if (token() === 55 || token() === 37 || token() === 38) {
+            parseExpected(22 /* CloseBracketToken */);
+            if (token() === 55 /* QuestionToken */ || token() === 37 /* PlusToken */ || token() === 38 /* MinusToken */) {
                 node.questionToken = parseTokenNode();
-                if (node.questionToken.kind !== 55) {
-                    parseExpectedToken(55);
+                if (node.questionToken.kind !== 55 /* QuestionToken */) {
+                    parseExpectedToken(55 /* QuestionToken */);
                 }
             }
             node.type = parseTypeAnnotation();
             parseSemicolon();
-            parseExpected(18);
+            parseExpected(18 /* CloseBraceToken */);
             return finishNode(node);
         }
         function parseTupleType() {
-            var node = createNode(168);
-            node.elementTypes = parseBracketedList(20, parseType, 21, 22);
+            var node = createNode(168 /* TupleType */);
+            node.elementTypes = parseBracketedList(20 /* TupleElementTypes */, parseType, 21 /* OpenBracketToken */, 22 /* CloseBracketToken */);
             return finishNode(node);
         }
         function parseParenthesizedType() {
-            var node = createNode(173);
-            parseExpected(19);
+            var node = createNode(173 /* ParenthesizedType */);
+            parseExpected(19 /* OpenParenToken */);
             node.type = parseType();
-            if (!node.type) {
-                return undefined;
-            }
-            parseExpected(20);
+            parseExpected(20 /* CloseParenToken */);
             return finishNode(node);
         }
-        function parseFunctionOrConstructorType(kind) {
-            var node = createNodeWithJSDoc(kind);
-            if (kind === 164) {
-                parseExpected(94);
-            }
-            if (!fillSignature(36, 4 | (sourceFile.languageVariant === 1 ? 8 : 0), node)) {
-                return undefined;
-            }
-            if (!node.parameters) {
-                return undefined;
-            }
+        function parseFunctionOrConstructorType() {
+            var pos = getNodePos();
+            var kind = parseOptional(94 /* NewKeyword */) ? 164 /* ConstructorType */ : 163 /* FunctionType */;
+            var node = createNodeWithJSDoc(kind, pos);
+            fillSignature(36 /* EqualsGreaterThanToken */, 4 /* Type */, node);
             return finishNode(node);
         }
         function parseKeywordAndNoDot() {
             var node = parseTokenNode();
-            return token() === 23 ? undefined : node;
+            return token() === 23 /* DotToken */ ? undefined : node;
         }
         function parseLiteralTypeNode(negative) {
-            var node = createNode(178);
+            var node = createNode(178 /* LiteralType */);
             var unaryMinusExpression;
             if (negative) {
-                unaryMinusExpression = createNode(198);
-                unaryMinusExpression.operator = 38;
+                unaryMinusExpression = createNode(198 /* PrefixUnaryExpression */);
+                unaryMinusExpression.operator = 38 /* MinusToken */;
                 nextToken();
             }
-            var expression = token() === 101 || token() === 86
+            var expression = token() === 101 /* TrueKeyword */ || token() === 86 /* FalseKeyword */
                 ? parseTokenNode()
                 : parseLiteralLikeNode(token());
             if (negative) {
@@ -13833,78 +17456,79 @@ var ts;
         }
         function isStartOfTypeOfImportType() {
             nextToken();
-            return token() === 91;
+            return token() === 91 /* ImportKeyword */;
         }
         function parseImportType() {
-            sourceFile.flags |= 524288;
-            var node = createNode(179);
-            if (parseOptional(103)) {
+            sourceFile.flags |= 524288 /* PossiblyContainsDynamicImport */;
+            var node = createNode(179 /* ImportType */);
+            if (parseOptional(103 /* TypeOfKeyword */)) {
                 node.isTypeOf = true;
             }
-            parseExpected(91);
-            parseExpected(19);
+            parseExpected(91 /* ImportKeyword */);
+            parseExpected(19 /* OpenParenToken */);
             node.argument = parseType();
-            parseExpected(20);
-            if (parseOptional(23)) {
-                node.qualifier = parseEntityName(true, ts.Diagnostics.Type_expected);
+            parseExpected(20 /* CloseParenToken */);
+            if (parseOptional(23 /* DotToken */)) {
+                node.qualifier = parseEntityName(/*allowReservedWords*/ true, ts.Diagnostics.Type_expected);
             }
             node.typeArguments = tryParseTypeArguments();
             return finishNode(node);
         }
         function nextTokenIsNumericLiteral() {
-            return nextToken() === 8;
+            return nextToken() === 8 /* NumericLiteral */;
         }
         function parseNonArrayType() {
             switch (token()) {
-                case 119:
-                case 142:
-                case 137:
-                case 134:
-                case 138:
-                case 122:
-                case 140:
-                case 131:
-                case 135:
+                case 119 /* AnyKeyword */:
+                case 142 /* UnknownKeyword */:
+                case 137 /* StringKeyword */:
+                case 134 /* NumberKeyword */:
+                case 138 /* SymbolKeyword */:
+                case 122 /* BooleanKeyword */:
+                case 140 /* UndefinedKeyword */:
+                case 131 /* NeverKeyword */:
+                case 135 /* ObjectKeyword */:
+                    // If these are followed by a dot, then parse these out as a dotted type reference instead.
                     return tryParse(parseKeywordAndNoDot) || parseTypeReference();
-                case 39:
-                    return parseJSDocAllType(false);
-                case 61:
-                    return parseJSDocAllType(true);
-                case 55:
+                case 39 /* AsteriskToken */:
+                    return parseJSDocAllType(/*postfixEquals*/ false);
+                case 61 /* AsteriskEqualsToken */:
+                    return parseJSDocAllType(/*postfixEquals*/ true);
+                case 55 /* QuestionToken */:
                     return parseJSDocUnknownOrNullableType();
-                case 89:
+                case 89 /* FunctionKeyword */:
                     return parseJSDocFunctionType();
-                case 51:
+                case 51 /* ExclamationToken */:
                     return parseJSDocNonNullableType();
-                case 13:
-                case 9:
-                case 8:
-                case 101:
-                case 86:
+                case 13 /* NoSubstitutionTemplateLiteral */:
+                case 9 /* StringLiteral */:
+                case 8 /* NumericLiteral */:
+                case 101 /* TrueKeyword */:
+                case 86 /* FalseKeyword */:
                     return parseLiteralTypeNode();
-                case 38:
-                    return lookAhead(nextTokenIsNumericLiteral) ? parseLiteralTypeNode(true) : parseTypeReference();
-                case 105:
-                case 95:
+                case 38 /* MinusToken */:
+                    return lookAhead(nextTokenIsNumericLiteral) ? parseLiteralTypeNode(/*negative*/ true) : parseTypeReference();
+                case 105 /* VoidKeyword */:
+                case 95 /* NullKeyword */:
                     return parseTokenNode();
-                case 99: {
+                case 99 /* ThisKeyword */: {
                     var thisKeyword = parseThisTypeNode();
-                    if (token() === 127 && !scanner.hasPrecedingLineBreak()) {
+                    if (token() === 127 /* IsKeyword */ && !scanner.hasPrecedingLineBreak()) {
                         return parseThisTypePredicate(thisKeyword);
                     }
                     else {
                         return thisKeyword;
                     }
                 }
-                case 103:
+                case 103 /* TypeOfKeyword */:
                     return lookAhead(isStartOfTypeOfImportType) ? parseImportType() : parseTypeQuery();
-                case 17:
+                case 17 /* OpenBraceToken */:
                     return lookAhead(isStartOfMappedType) ? parseMappedType() : parseTypeLiteral();
-                case 21:
+                case 21 /* OpenBracketToken */:
                     return parseTupleType();
-                case 19:
+                case 19 /* OpenParenToken */:
                     return parseParenthesizedType();
-                case 91:
+                case 91 /* ImportKeyword */:
                     return parseImportType();
                 default:
                     return parseTypeReference();
@@ -13912,40 +17536,42 @@ var ts;
         }
         function isStartOfType(inStartOfParameter) {
             switch (token()) {
-                case 119:
-                case 142:
-                case 137:
-                case 134:
-                case 122:
-                case 138:
-                case 141:
-                case 105:
-                case 140:
-                case 95:
-                case 99:
-                case 103:
-                case 131:
-                case 17:
-                case 21:
-                case 27:
-                case 49:
-                case 48:
-                case 94:
-                case 9:
-                case 8:
-                case 101:
-                case 86:
-                case 135:
-                case 39:
-                case 55:
-                case 51:
-                case 24:
-                case 126:
-                case 91:
+                case 119 /* AnyKeyword */:
+                case 142 /* UnknownKeyword */:
+                case 137 /* StringKeyword */:
+                case 134 /* NumberKeyword */:
+                case 122 /* BooleanKeyword */:
+                case 138 /* SymbolKeyword */:
+                case 141 /* UniqueKeyword */:
+                case 105 /* VoidKeyword */:
+                case 140 /* UndefinedKeyword */:
+                case 95 /* NullKeyword */:
+                case 99 /* ThisKeyword */:
+                case 103 /* TypeOfKeyword */:
+                case 131 /* NeverKeyword */:
+                case 17 /* OpenBraceToken */:
+                case 21 /* OpenBracketToken */:
+                case 27 /* LessThanToken */:
+                case 49 /* BarToken */:
+                case 48 /* AmpersandToken */:
+                case 94 /* NewKeyword */:
+                case 9 /* StringLiteral */:
+                case 8 /* NumericLiteral */:
+                case 101 /* TrueKeyword */:
+                case 86 /* FalseKeyword */:
+                case 135 /* ObjectKeyword */:
+                case 39 /* AsteriskToken */:
+                case 55 /* QuestionToken */:
+                case 51 /* ExclamationToken */:
+                case 24 /* DotDotDotToken */:
+                case 126 /* InferKeyword */:
+                case 91 /* ImportKeyword */:
                     return true;
-                case 38:
+                case 38 /* MinusToken */:
                     return !inStartOfParameter && lookAhead(nextTokenIsNumericLiteral);
-                case 19:
+                case 19 /* OpenParenToken */:
+                    // Only consider '(' the start of a type if followed by ')', '...', an identifier, a modifier,
+                    // or something that starts a type. We don't want to consider things like '(1)' a type.
                     return !inStartOfParameter && lookAhead(isStartOfParenthesizedOrFunctionType);
                 default:
                     return isIdentifier();
@@ -13953,34 +17579,35 @@ var ts;
         }
         function isStartOfParenthesizedOrFunctionType() {
             nextToken();
-            return token() === 20 || isStartOfParameter() || isStartOfType();
+            return token() === 20 /* CloseParenToken */ || isStartOfParameter() || isStartOfType();
         }
         function parsePostfixTypeOrHigher() {
             var type = parseNonArrayType();
             while (!scanner.hasPrecedingLineBreak()) {
                 switch (token()) {
-                    case 51:
-                        type = createJSDocPostfixType(282, type);
+                    case 51 /* ExclamationToken */:
+                        type = createJSDocPostfixType(282 /* JSDocNonNullableType */, type);
                         break;
-                    case 55:
-                        if (!(contextFlags & 2097152) && lookAhead(nextTokenIsStartOfType)) {
+                    case 55 /* QuestionToken */:
+                        // If not in JSDoc and next token is start of a type we have a conditional type
+                        if (!(contextFlags & 2097152 /* JSDoc */) && lookAhead(nextTokenIsStartOfType)) {
                             return type;
                         }
-                        type = createJSDocPostfixType(281, type);
+                        type = createJSDocPostfixType(281 /* JSDocNullableType */, type);
                         break;
-                    case 21:
-                        parseExpected(21);
+                    case 21 /* OpenBracketToken */:
+                        parseExpected(21 /* OpenBracketToken */);
                         if (isStartOfType()) {
-                            var node = createNode(176, type.pos);
+                            var node = createNode(176 /* IndexedAccessType */, type.pos);
                             node.objectType = type;
                             node.indexType = parseType();
-                            parseExpected(22);
+                            parseExpected(22 /* CloseBracketToken */);
                             type = finishNode(node);
                         }
                         else {
-                            var node = createNode(167, type.pos);
+                            var node = createNode(167 /* ArrayType */, type.pos);
                             node.elementType = type;
-                            parseExpected(22);
+                            parseExpected(22 /* CloseBracketToken */);
                             type = finishNode(node);
                         }
                         break;
@@ -13997,16 +17624,16 @@ var ts;
             return finishNode(postfix);
         }
         function parseTypeOperator(operator) {
-            var node = createNode(175);
+            var node = createNode(175 /* TypeOperator */);
             parseExpected(operator);
             node.operator = operator;
             node.type = parseTypeOperatorOrHigher();
             return finishNode(node);
         }
         function parseInferType() {
-            var node = createNode(172);
-            parseExpected(126);
-            var typeParameter = createNode(148);
+            var node = createNode(172 /* InferType */);
+            parseExpected(126 /* InferKeyword */);
+            var typeParameter = createNode(148 /* TypeParameter */);
             typeParameter.name = parseIdentifier();
             node.typeParameter = finishNode(typeParameter);
             return finishNode(node);
@@ -14014,10 +17641,10 @@ var ts;
         function parseTypeOperatorOrHigher() {
             var operator = token();
             switch (operator) {
-                case 128:
-                case 141:
+                case 128 /* KeyOfKeyword */:
+                case 141 /* UniqueKeyword */:
                     return parseTypeOperator(operator);
-                case 126:
+                case 126 /* InferKeyword */:
                     return parseInferType();
             }
             return parsePostfixTypeOrHigher();
@@ -14037,26 +17664,28 @@ var ts;
             return type;
         }
         function parseIntersectionTypeOrHigher() {
-            return parseUnionOrIntersectionType(170, parseTypeOperatorOrHigher, 48);
+            return parseUnionOrIntersectionType(170 /* IntersectionType */, parseTypeOperatorOrHigher, 48 /* AmpersandToken */);
         }
         function parseUnionTypeOrHigher() {
-            return parseUnionOrIntersectionType(169, parseIntersectionTypeOrHigher, 49);
+            return parseUnionOrIntersectionType(169 /* UnionType */, parseIntersectionTypeOrHigher, 49 /* BarToken */);
         }
         function isStartOfFunctionType() {
-            if (token() === 27) {
+            if (token() === 27 /* LessThanToken */) {
                 return true;
             }
-            return token() === 19 && lookAhead(isUnambiguouslyStartOfFunctionType);
+            return token() === 19 /* OpenParenToken */ && lookAhead(isUnambiguouslyStartOfFunctionType);
         }
         function skipParameterStart() {
             if (ts.isModifierKind(token())) {
+                // Skip modifiers
                 parseModifiers();
             }
-            if (isIdentifier() || token() === 99) {
+            if (isIdentifier() || token() === 99 /* ThisKeyword */) {
                 nextToken();
                 return true;
             }
-            if (token() === 21 || token() === 17) {
+            if (token() === 21 /* OpenBracketToken */ || token() === 17 /* OpenBraceToken */) {
+                // Return true if we can parse an array or object binding pattern with no errors
                 var previousErrorCount = parseDiagnostics.length;
                 parseIdentifierOrPattern();
                 return previousErrorCount === parseDiagnostics.length;
@@ -14065,17 +17694,26 @@ var ts;
         }
         function isUnambiguouslyStartOfFunctionType() {
             nextToken();
-            if (token() === 20 || token() === 24) {
+            if (token() === 20 /* CloseParenToken */ || token() === 24 /* DotDotDotToken */) {
+                // ( )
+                // ( ...
                 return true;
             }
             if (skipParameterStart()) {
-                if (token() === 56 || token() === 26 ||
-                    token() === 55 || token() === 58) {
+                // We successfully skipped modifiers (if any) and an identifier or binding pattern,
+                // now see if we have something that indicates a parameter declaration
+                if (token() === 56 /* ColonToken */ || token() === 26 /* CommaToken */ ||
+                    token() === 55 /* QuestionToken */ || token() === 58 /* EqualsToken */) {
+                    // ( xxx :
+                    // ( xxx ,
+                    // ( xxx ?
+                    // ( xxx =
                     return true;
                 }
-                if (token() === 20) {
+                if (token() === 20 /* CloseParenToken */) {
                     nextToken();
-                    if (token() === 36) {
+                    if (token() === 36 /* EqualsGreaterThanToken */) {
+                        // ( xxx ) =>
                         return true;
                     }
                 }
@@ -14086,7 +17724,7 @@ var ts;
             var typePredicateVariable = isIdentifier() && tryParse(parseTypePredicatePrefix);
             var type = parseType();
             if (typePredicateVariable) {
-                var node = createNode(161, typePredicateVariable.pos);
+                var node = createNode(161 /* TypePredicate */, typePredicateVariable.pos);
                 node.parameterName = typePredicateVariable;
                 node.type = type;
                 return finishNode(node);
@@ -14097,59 +17735,60 @@ var ts;
         }
         function parseTypePredicatePrefix() {
             var id = parseIdentifier();
-            if (token() === 127 && !scanner.hasPrecedingLineBreak()) {
+            if (token() === 127 /* IsKeyword */ && !scanner.hasPrecedingLineBreak()) {
                 nextToken();
                 return id;
             }
         }
         function parseType() {
-            return doOutsideOfContext(20480, parseTypeWorker);
+            // The rules about 'yield' only apply to actual code/expression contexts.  They don't
+            // apply to 'type' contexts.  So we disable these parameters here before moving on.
+            return doOutsideOfContext(20480 /* TypeExcludesFlags */, parseTypeWorker);
         }
         function parseTypeWorker(noConditionalTypes) {
-            if (isStartOfFunctionType()) {
-                return parseFunctionOrConstructorType(163);
-            }
-            if (token() === 94) {
-                return parseFunctionOrConstructorType(164);
+            if (isStartOfFunctionType() || token() === 94 /* NewKeyword */) {
+                return parseFunctionOrConstructorType();
             }
             var type = parseUnionTypeOrHigher();
-            if (!noConditionalTypes && !scanner.hasPrecedingLineBreak() && parseOptional(85)) {
-                var node = createNode(171, type.pos);
+            if (!noConditionalTypes && !scanner.hasPrecedingLineBreak() && parseOptional(85 /* ExtendsKeyword */)) {
+                var node = createNode(171 /* ConditionalType */, type.pos);
                 node.checkType = type;
-                node.extendsType = parseTypeWorker(true);
-                parseExpected(55);
+                // The type following 'extends' is not permitted to be another conditional type
+                node.extendsType = parseTypeWorker(/*noConditionalTypes*/ true);
+                parseExpected(55 /* QuestionToken */);
                 node.trueType = parseTypeWorker();
-                parseExpected(56);
+                parseExpected(56 /* ColonToken */);
                 node.falseType = parseTypeWorker();
                 return finishNode(node);
             }
             return type;
         }
         function parseTypeAnnotation() {
-            return parseOptional(56) ? parseType() : undefined;
+            return parseOptional(56 /* ColonToken */) ? parseType() : undefined;
         }
+        // EXPRESSIONS
         function isStartOfLeftHandSideExpression() {
             switch (token()) {
-                case 99:
-                case 97:
-                case 95:
-                case 101:
-                case 86:
-                case 8:
-                case 9:
-                case 13:
-                case 14:
-                case 19:
-                case 21:
-                case 17:
-                case 89:
-                case 75:
-                case 94:
-                case 41:
-                case 63:
-                case 71:
+                case 99 /* ThisKeyword */:
+                case 97 /* SuperKeyword */:
+                case 95 /* NullKeyword */:
+                case 101 /* TrueKeyword */:
+                case 86 /* FalseKeyword */:
+                case 8 /* NumericLiteral */:
+                case 9 /* StringLiteral */:
+                case 13 /* NoSubstitutionTemplateLiteral */:
+                case 14 /* TemplateHead */:
+                case 19 /* OpenParenToken */:
+                case 21 /* OpenBracketToken */:
+                case 17 /* OpenBraceToken */:
+                case 89 /* FunctionKeyword */:
+                case 75 /* ClassKeyword */:
+                case 94 /* NewKeyword */:
+                case 41 /* SlashToken */:
+                case 63 /* SlashEqualsToken */:
+                case 71 /* Identifier */:
                     return true;
-                case 91:
+                case 91 /* ImportKeyword */:
                     return lookAhead(nextTokenIsOpenParenOrLessThanOrDot);
                 default:
                     return isIdentifier();
@@ -14160,20 +17799,27 @@ var ts;
                 return true;
             }
             switch (token()) {
-                case 37:
-                case 38:
-                case 52:
-                case 51:
-                case 80:
-                case 103:
-                case 105:
-                case 43:
-                case 44:
-                case 27:
-                case 121:
-                case 116:
+                case 37 /* PlusToken */:
+                case 38 /* MinusToken */:
+                case 52 /* TildeToken */:
+                case 51 /* ExclamationToken */:
+                case 80 /* DeleteKeyword */:
+                case 103 /* TypeOfKeyword */:
+                case 105 /* VoidKeyword */:
+                case 43 /* PlusPlusToken */:
+                case 44 /* MinusMinusToken */:
+                case 27 /* LessThanToken */:
+                case 121 /* AwaitKeyword */:
+                case 116 /* YieldKeyword */:
+                    // Yield/await always starts an expression.  Either it is an identifier (in which case
+                    // it is definitely an expression).  Or it's a keyword (either because we're in
+                    // a generator or async function, or in strict mode (or both)) and it started a yield or await expression.
                     return true;
                 default:
+                    // Error tolerance.  If we see the start of some binary operator, we consider
+                    // that the start of an expression.  That way we'll parse out a missing identifier,
+                    // give a good message about an identifier being missing, and then consume the
+                    // rest of the binary expression.
                     if (isBinaryOperator()) {
                         return true;
                     }
@@ -14181,52 +17827,114 @@ var ts;
             }
         }
         function isStartOfExpressionStatement() {
-            return token() !== 17 &&
-                token() !== 89 &&
-                token() !== 75 &&
-                token() !== 57 &&
+            // As per the grammar, none of '{' or 'function' or 'class' can start an expression statement.
+            return token() !== 17 /* OpenBraceToken */ &&
+                token() !== 89 /* FunctionKeyword */ &&
+                token() !== 75 /* ClassKeyword */ &&
+                token() !== 57 /* AtToken */ &&
                 isStartOfExpression();
         }
         function parseExpression() {
+            // Expression[in]:
+            //      AssignmentExpression[in]
+            //      Expression[in] , AssignmentExpression[in]
+            // clear the decorator context when parsing Expression, as it should be unambiguous when parsing a decorator
             var saveDecoratorContext = inDecoratorContext();
             if (saveDecoratorContext) {
-                setDecoratorContext(false);
+                setDecoratorContext(/*val*/ false);
             }
             var expr = parseAssignmentExpressionOrHigher();
             var operatorToken;
-            while ((operatorToken = parseOptionalToken(26))) {
+            while ((operatorToken = parseOptionalToken(26 /* CommaToken */))) {
                 expr = makeBinaryExpression(expr, operatorToken, parseAssignmentExpressionOrHigher());
             }
             if (saveDecoratorContext) {
-                setDecoratorContext(true);
+                setDecoratorContext(/*val*/ true);
             }
             return expr;
         }
         function parseInitializer() {
-            return parseOptional(58) ? parseAssignmentExpressionOrHigher() : undefined;
+            return parseOptional(58 /* EqualsToken */) ? parseAssignmentExpressionOrHigher() : undefined;
         }
         function parseAssignmentExpressionOrHigher() {
+            //  AssignmentExpression[in,yield]:
+            //      1) ConditionalExpression[?in,?yield]
+            //      2) LeftHandSideExpression = AssignmentExpression[?in,?yield]
+            //      3) LeftHandSideExpression AssignmentOperator AssignmentExpression[?in,?yield]
+            //      4) ArrowFunctionExpression[?in,?yield]
+            //      5) AsyncArrowFunctionExpression[in,yield,await]
+            //      6) [+Yield] YieldExpression[?In]
+            //
+            // Note: for ease of implementation we treat productions '2' and '3' as the same thing.
+            // (i.e. they're both BinaryExpressions with an assignment operator in it).
+            // First, do the simple check if we have a YieldExpression (production '6').
             if (isYieldExpression()) {
                 return parseYieldExpression();
             }
+            // Then, check if we have an arrow function (production '4' and '5') that starts with a parenthesized
+            // parameter list or is an async arrow function.
+            // AsyncArrowFunctionExpression:
+            //      1) async[no LineTerminator here]AsyncArrowBindingIdentifier[?Yield][no LineTerminator here]=>AsyncConciseBody[?In]
+            //      2) CoverCallExpressionAndAsyncArrowHead[?Yield, ?Await][no LineTerminator here]=>AsyncConciseBody[?In]
+            // Production (1) of AsyncArrowFunctionExpression is parsed in "tryParseAsyncSimpleArrowFunctionExpression".
+            // And production (2) is parsed in "tryParseParenthesizedArrowFunctionExpression".
+            //
+            // If we do successfully parse arrow-function, we must *not* recurse for productions 1, 2 or 3. An ArrowFunction is
+            // not a LeftHandSideExpression, nor does it start a ConditionalExpression.  So we are done
+            // with AssignmentExpression if we see one.
             var arrowExpression = tryParseParenthesizedArrowFunctionExpression() || tryParseAsyncSimpleArrowFunctionExpression();
             if (arrowExpression) {
                 return arrowExpression;
             }
-            var expr = parseBinaryExpressionOrHigher(0);
-            if (expr.kind === 71 && token() === 36) {
+            // Now try to see if we're in production '1', '2' or '3'.  A conditional expression can
+            // start with a LogicalOrExpression, while the assignment productions can only start with
+            // LeftHandSideExpressions.
+            //
+            // So, first, we try to just parse out a BinaryExpression.  If we get something that is a
+            // LeftHandSide or higher, then we can try to parse out the assignment expression part.
+            // Otherwise, we try to parse out the conditional expression bit.  We want to allow any
+            // binary expression here, so we pass in the 'lowest' precedence here so that it matches
+            // and consumes anything.
+            var expr = parseBinaryExpressionOrHigher(/*precedence*/ 0);
+            // To avoid a look-ahead, we did not handle the case of an arrow function with a single un-parenthesized
+            // parameter ('x => ...') above. We handle it here by checking if the parsed expression was a single
+            // identifier and the current token is an arrow.
+            if (expr.kind === 71 /* Identifier */ && token() === 36 /* EqualsGreaterThanToken */) {
                 return parseSimpleArrowFunctionExpression(expr);
             }
+            // Now see if we might be in cases '2' or '3'.
+            // If the expression was a LHS expression, and we have an assignment operator, then
+            // we're in '2' or '3'. Consume the assignment and return.
+            //
+            // Note: we call reScanGreaterToken so that we get an appropriately merged token
+            // for cases like `> > =` becoming `>>=`
             if (ts.isLeftHandSideExpression(expr) && ts.isAssignmentOperator(reScanGreaterToken())) {
                 return makeBinaryExpression(expr, parseTokenNode(), parseAssignmentExpressionOrHigher());
             }
+            // It wasn't an assignment or a lambda.  This is a conditional expression:
             return parseConditionalExpressionRest(expr);
         }
         function isYieldExpression() {
-            if (token() === 116) {
+            if (token() === 116 /* YieldKeyword */) {
+                // If we have a 'yield' keyword, and this is a context where yield expressions are
+                // allowed, then definitely parse out a yield expression.
                 if (inYieldContext()) {
                     return true;
                 }
+                // We're in a context where 'yield expr' is not allowed.  However, if we can
+                // definitely tell that the user was trying to parse a 'yield expr' and not
+                // just a normal expr that start with a 'yield' identifier, then parse out
+                // a 'yield expr'.  We can then report an error later that they are only
+                // allowed in generator expressions.
+                //
+                // for example, if we see 'yield(foo)', then we'll have to treat that as an
+                // invocation expression of something called 'yield'.  However, if we have
+                // 'yield foo' then that is not legal as a normal expression, so we can
+                // definitely recognize this as a yield expression.
+                //
+                // for now we just check if the next token is an identifier.  More heuristics
+                // can be added here later as necessary.  We just need to make sure that we
+                // don't accidentally consume something legal.
                 return lookAhead(nextTokenIsIdentifierOrKeywordOrLiteralOnSameLine);
             }
             return false;
@@ -14236,216 +17944,302 @@ var ts;
             return !scanner.hasPrecedingLineBreak() && isIdentifier();
         }
         function parseYieldExpression() {
-            var node = createNode(203);
+            var node = createNode(203 /* YieldExpression */);
+            // YieldExpression[In] :
+            //      yield
+            //      yield [no LineTerminator here] [Lexical goal InputElementRegExp]AssignmentExpression[?In, Yield]
+            //      yield [no LineTerminator here] * [Lexical goal InputElementRegExp]AssignmentExpression[?In, Yield]
             nextToken();
             if (!scanner.hasPrecedingLineBreak() &&
-                (token() === 39 || isStartOfExpression())) {
-                node.asteriskToken = parseOptionalToken(39);
+                (token() === 39 /* AsteriskToken */ || isStartOfExpression())) {
+                node.asteriskToken = parseOptionalToken(39 /* AsteriskToken */);
                 node.expression = parseAssignmentExpressionOrHigher();
                 return finishNode(node);
             }
             else {
+                // if the next token is not on the same line as yield.  or we don't have an '*' or
+                // the start of an expression, then this is just a simple "yield" expression.
                 return finishNode(node);
             }
         }
         function parseSimpleArrowFunctionExpression(identifier, asyncModifier) {
-            ts.Debug.assert(token() === 36, "parseSimpleArrowFunctionExpression should only have been called if we had a =>");
+            ts.Debug.assert(token() === 36 /* EqualsGreaterThanToken */, "parseSimpleArrowFunctionExpression should only have been called if we had a =>");
             var node;
             if (asyncModifier) {
-                node = createNode(193, asyncModifier.pos);
+                node = createNode(193 /* ArrowFunction */, asyncModifier.pos);
                 node.modifiers = asyncModifier;
             }
             else {
-                node = createNode(193, identifier.pos);
+                node = createNode(193 /* ArrowFunction */, identifier.pos);
             }
-            var parameter = createNode(149, identifier.pos);
+            var parameter = createNode(149 /* Parameter */, identifier.pos);
             parameter.name = identifier;
             finishNode(parameter);
             node.parameters = createNodeArray([parameter], parameter.pos, parameter.end);
-            node.equalsGreaterThanToken = parseExpectedToken(36);
-            node.body = parseArrowFunctionExpressionBody(!!asyncModifier);
+            node.equalsGreaterThanToken = parseExpectedToken(36 /* EqualsGreaterThanToken */);
+            node.body = parseArrowFunctionExpressionBody(/*isAsync*/ !!asyncModifier);
             return addJSDocComment(finishNode(node));
         }
         function tryParseParenthesizedArrowFunctionExpression() {
             var triState = isParenthesizedArrowFunctionExpression();
-            if (triState === 0) {
+            if (triState === 0 /* False */) {
+                // It's definitely not a parenthesized arrow function expression.
                 return undefined;
             }
-            var arrowFunction = triState === 1
-                ? parseParenthesizedArrowFunctionExpressionHead(true)
+            // If we definitely have an arrow function, then we can just parse one, not requiring a
+            // following => or { token. Otherwise, we *might* have an arrow function.  Try to parse
+            // it out, but don't allow any ambiguity, and return 'undefined' if this could be an
+            // expression instead.
+            var arrowFunction = triState === 1 /* True */
+                ? parseParenthesizedArrowFunctionExpressionHead(/*allowAmbiguity*/ true)
                 : tryParse(parsePossibleParenthesizedArrowFunctionExpressionHead);
             if (!arrowFunction) {
+                // Didn't appear to actually be a parenthesized arrow function.  Just bail out.
                 return undefined;
             }
-            var isAsync = ts.hasModifier(arrowFunction, 256);
+            var isAsync = ts.hasModifier(arrowFunction, 256 /* Async */);
+            // If we have an arrow, then try to parse the body. Even if not, try to parse if we
+            // have an opening brace, just in case we're in an error state.
             var lastToken = token();
-            arrowFunction.equalsGreaterThanToken = parseExpectedToken(36);
-            arrowFunction.body = (lastToken === 36 || lastToken === 17)
+            arrowFunction.equalsGreaterThanToken = parseExpectedToken(36 /* EqualsGreaterThanToken */);
+            arrowFunction.body = (lastToken === 36 /* EqualsGreaterThanToken */ || lastToken === 17 /* OpenBraceToken */)
                 ? parseArrowFunctionExpressionBody(isAsync)
                 : parseIdentifier();
             return finishNode(arrowFunction);
         }
+        //  True        -> We definitely expect a parenthesized arrow function here.
+        //  False       -> There *cannot* be a parenthesized arrow function here.
+        //  Unknown     -> There *might* be a parenthesized arrow function here.
+        //                 Speculatively look ahead to be sure, and rollback if not.
         function isParenthesizedArrowFunctionExpression() {
-            if (token() === 19 || token() === 27 || token() === 120) {
+            if (token() === 19 /* OpenParenToken */ || token() === 27 /* LessThanToken */ || token() === 120 /* AsyncKeyword */) {
                 return lookAhead(isParenthesizedArrowFunctionExpressionWorker);
             }
-            if (token() === 36) {
-                return 1;
+            if (token() === 36 /* EqualsGreaterThanToken */) {
+                // ERROR RECOVERY TWEAK:
+                // If we see a standalone => try to parse it as an arrow function expression as that's
+                // likely what the user intended to write.
+                return 1 /* True */;
             }
-            return 0;
+            // Definitely not a parenthesized arrow function.
+            return 0 /* False */;
         }
         function isParenthesizedArrowFunctionExpressionWorker() {
-            if (token() === 120) {
+            if (token() === 120 /* AsyncKeyword */) {
                 nextToken();
                 if (scanner.hasPrecedingLineBreak()) {
-                    return 0;
+                    return 0 /* False */;
                 }
-                if (token() !== 19 && token() !== 27) {
-                    return 0;
+                if (token() !== 19 /* OpenParenToken */ && token() !== 27 /* LessThanToken */) {
+                    return 0 /* False */;
                 }
             }
             var first = token();
             var second = nextToken();
-            if (first === 19) {
-                if (second === 20) {
+            if (first === 19 /* OpenParenToken */) {
+                if (second === 20 /* CloseParenToken */) {
+                    // Simple cases: "() =>", "(): ", and "() {".
+                    // This is an arrow function with no parameters.
+                    // The last one is not actually an arrow function,
+                    // but this is probably what the user intended.
                     var third = nextToken();
                     switch (third) {
-                        case 36:
-                        case 56:
-                        case 17:
-                            return 1;
+                        case 36 /* EqualsGreaterThanToken */:
+                        case 56 /* ColonToken */:
+                        case 17 /* OpenBraceToken */:
+                            return 1 /* True */;
                         default:
-                            return 0;
+                            return 0 /* False */;
                     }
                 }
-                if (second === 21 || second === 17) {
-                    return 2;
+                // If encounter "([" or "({", this could be the start of a binding pattern.
+                // Examples:
+                //      ([ x ]) => { }
+                //      ({ x }) => { }
+                //      ([ x ])
+                //      ({ x })
+                if (second === 21 /* OpenBracketToken */ || second === 17 /* OpenBraceToken */) {
+                    return 2 /* Unknown */;
                 }
-                if (second === 24) {
-                    return 1;
+                // Simple case: "(..."
+                // This is an arrow function with a rest parameter.
+                if (second === 24 /* DotDotDotToken */) {
+                    return 1 /* True */;
                 }
-                if (ts.isModifierKind(second) && second !== 120 && lookAhead(nextTokenIsIdentifier)) {
-                    return 1;
+                // Check for "(xxx yyy", where xxx is a modifier and yyy is an identifier. This
+                // isn't actually allowed, but we want to treat it as a lambda so we can provide
+                // a good error message.
+                if (ts.isModifierKind(second) && second !== 120 /* AsyncKeyword */ && lookAhead(nextTokenIsIdentifier)) {
+                    return 1 /* True */;
                 }
+                // If we had "(" followed by something that's not an identifier,
+                // then this definitely doesn't look like a lambda.
                 if (!isIdentifier()) {
-                    return 0;
+                    return 0 /* False */;
                 }
                 switch (nextToken()) {
-                    case 56:
-                        return 1;
-                    case 55:
+                    case 56 /* ColonToken */:
+                        // If we have something like "(a:", then we must have a
+                        // type-annotated parameter in an arrow function expression.
+                        return 1 /* True */;
+                    case 55 /* QuestionToken */:
                         nextToken();
-                        if (token() === 56 || token() === 26 || token() === 58 || token() === 20) {
-                            return 1;
+                        // If we have "(a?:" or "(a?," or "(a?=" or "(a?)" then it is definitely a lambda.
+                        if (token() === 56 /* ColonToken */ || token() === 26 /* CommaToken */ || token() === 58 /* EqualsToken */ || token() === 20 /* CloseParenToken */) {
+                            return 1 /* True */;
                         }
-                        return 0;
-                    case 26:
-                    case 58:
-                    case 20:
-                        return 2;
+                        // Otherwise it is definitely not a lambda.
+                        return 0 /* False */;
+                    case 26 /* CommaToken */:
+                    case 58 /* EqualsToken */:
+                    case 20 /* CloseParenToken */:
+                        // If we have "(a," or "(a=" or "(a)" this *could* be an arrow function
+                        return 2 /* Unknown */;
                 }
-                return 0;
+                // It is definitely not an arrow function
+                return 0 /* False */;
             }
             else {
-                ts.Debug.assert(first === 27);
+                ts.Debug.assert(first === 27 /* LessThanToken */);
+                // If we have "<" not followed by an identifier,
+                // then this definitely is not an arrow function.
                 if (!isIdentifier()) {
-                    return 0;
+                    return 0 /* False */;
                 }
-                if (sourceFile.languageVariant === 1) {
+                // JSX overrides
+                if (sourceFile.languageVariant === 1 /* JSX */) {
                     var isArrowFunctionInJsx = lookAhead(function () {
                         var third = nextToken();
-                        if (third === 85) {
+                        if (third === 85 /* ExtendsKeyword */) {
                             var fourth = nextToken();
                             switch (fourth) {
-                                case 58:
-                                case 29:
+                                case 58 /* EqualsToken */:
+                                case 29 /* GreaterThanToken */:
                                     return false;
                                 default:
                                     return true;
                             }
                         }
-                        else if (third === 26) {
+                        else if (third === 26 /* CommaToken */) {
                             return true;
                         }
                         return false;
                     });
                     if (isArrowFunctionInJsx) {
-                        return 1;
+                        return 1 /* True */;
                     }
-                    return 0;
+                    return 0 /* False */;
                 }
-                return 2;
+                // This *could* be a parenthesized arrow function.
+                return 2 /* Unknown */;
             }
         }
         function parsePossibleParenthesizedArrowFunctionExpressionHead() {
-            return parseParenthesizedArrowFunctionExpressionHead(false);
+            return parseParenthesizedArrowFunctionExpressionHead(/*allowAmbiguity*/ false);
         }
         function tryParseAsyncSimpleArrowFunctionExpression() {
-            if (token() === 120) {
-                if (lookAhead(isUnParenthesizedAsyncArrowFunctionWorker) === 1) {
+            // We do a check here so that we won't be doing unnecessarily call to "lookAhead"
+            if (token() === 120 /* AsyncKeyword */) {
+                if (lookAhead(isUnParenthesizedAsyncArrowFunctionWorker) === 1 /* True */) {
                     var asyncModifier = parseModifiersForArrowFunction();
-                    var expr = parseBinaryExpressionOrHigher(0);
+                    var expr = parseBinaryExpressionOrHigher(/*precedence*/ 0);
                     return parseSimpleArrowFunctionExpression(expr, asyncModifier);
                 }
             }
             return undefined;
         }
         function isUnParenthesizedAsyncArrowFunctionWorker() {
-            if (token() === 120) {
+            // AsyncArrowFunctionExpression:
+            //      1) async[no LineTerminator here]AsyncArrowBindingIdentifier[?Yield][no LineTerminator here]=>AsyncConciseBody[?In]
+            //      2) CoverCallExpressionAndAsyncArrowHead[?Yield, ?Await][no LineTerminator here]=>AsyncConciseBody[?In]
+            if (token() === 120 /* AsyncKeyword */) {
                 nextToken();
-                if (scanner.hasPrecedingLineBreak() || token() === 36) {
-                    return 0;
+                // If the "async" is followed by "=>" token then it is not a beginning of an async arrow-function
+                // but instead a simple arrow-function which will be parsed inside "parseAssignmentExpressionOrHigher"
+                if (scanner.hasPrecedingLineBreak() || token() === 36 /* EqualsGreaterThanToken */) {
+                    return 0 /* False */;
                 }
-                var expr = parseBinaryExpressionOrHigher(0);
-                if (!scanner.hasPrecedingLineBreak() && expr.kind === 71 && token() === 36) {
-                    return 1;
+                // Check for un-parenthesized AsyncArrowFunction
+                var expr = parseBinaryExpressionOrHigher(/*precedence*/ 0);
+                if (!scanner.hasPrecedingLineBreak() && expr.kind === 71 /* Identifier */ && token() === 36 /* EqualsGreaterThanToken */) {
+                    return 1 /* True */;
                 }
             }
-            return 0;
+            return 0 /* False */;
         }
         function parseParenthesizedArrowFunctionExpressionHead(allowAmbiguity) {
-            var node = createNodeWithJSDoc(193);
+            var node = createNodeWithJSDoc(193 /* ArrowFunction */);
             node.modifiers = parseModifiersForArrowFunction();
-            var isAsync = ts.hasModifier(node, 256) ? 2 : 0;
-            if (!fillSignature(56, isAsync | (allowAmbiguity ? 0 : 8), node)) {
+            var isAsync = ts.hasModifier(node, 256 /* Async */) ? 2 /* Await */ : 0 /* None */;
+            // Arrow functions are never generators.
+            //
+            // If we're speculatively parsing a signature for a parenthesized arrow function, then
+            // we have to have a complete parameter list.  Otherwise we might see something like
+            // a => (b => c)
+            // And think that "(b =>" was actually a parenthesized arrow function with a missing
+            // close paren.
+            if (!fillSignature(56 /* ColonToken */, isAsync, node) && !allowAmbiguity) {
                 return undefined;
             }
-            if (!node.parameters) {
-                return undefined;
-            }
-            if (!allowAmbiguity && token() !== 36 && token() !== 17) {
+            // Parsing a signature isn't enough.
+            // Parenthesized arrow signatures often look like other valid expressions.
+            // For instance:
+            //  - "(x = 10)" is an assignment expression parsed as a signature with a default parameter value.
+            //  - "(x,y)" is a comma expression parsed as a signature with two parameters.
+            //  - "a ? (b): c" will have "(b):" parsed as a signature with a return type annotation.
+            //
+            // So we need just a bit of lookahead to ensure that it can only be a signature.
+            if (!allowAmbiguity && token() !== 36 /* EqualsGreaterThanToken */ && token() !== 17 /* OpenBraceToken */) {
+                // Returning undefined here will cause our caller to rewind to where we started from.
                 return undefined;
             }
             return node;
         }
         function parseArrowFunctionExpressionBody(isAsync) {
-            if (token() === 17) {
-                return parseFunctionBlock(isAsync ? 2 : 0);
+            if (token() === 17 /* OpenBraceToken */) {
+                return parseFunctionBlock(isAsync ? 2 /* Await */ : 0 /* None */);
             }
-            if (token() !== 25 &&
-                token() !== 89 &&
-                token() !== 75 &&
+            if (token() !== 25 /* SemicolonToken */ &&
+                token() !== 89 /* FunctionKeyword */ &&
+                token() !== 75 /* ClassKeyword */ &&
                 isStartOfStatement() &&
                 !isStartOfExpressionStatement()) {
-                return parseFunctionBlock(16 | (isAsync ? 2 : 0));
+                // Check if we got a plain statement (i.e. no expression-statements, no function/class expressions/declarations)
+                //
+                // Here we try to recover from a potential error situation in the case where the
+                // user meant to supply a block. For example, if the user wrote:
+                //
+                //  a =>
+                //      let v = 0;
+                //  }
+                //
+                // they may be missing an open brace.  Check to see if that's the case so we can
+                // try to recover better.  If we don't do this, then the next close curly we see may end
+                // up preemptively closing the containing construct.
+                //
+                // Note: even when 'IgnoreMissingOpenBrace' is passed, parseBody will still error.
+                return parseFunctionBlock(16 /* IgnoreMissingOpenBrace */ | (isAsync ? 2 /* Await */ : 0 /* None */));
             }
             return isAsync
                 ? doInAwaitContext(parseAssignmentExpressionOrHigher)
                 : doOutsideOfAwaitContext(parseAssignmentExpressionOrHigher);
         }
         function parseConditionalExpressionRest(leftOperand) {
-            var questionToken = parseOptionalToken(55);
+            // Note: we are passed in an expression which was produced from parseBinaryExpressionOrHigher.
+            var questionToken = parseOptionalToken(55 /* QuestionToken */);
             if (!questionToken) {
                 return leftOperand;
             }
-            var node = createNode(201, leftOperand.pos);
+            // Note: we explicitly 'allowIn' in the whenTrue part of the condition expression, and
+            // we do not that for the 'whenFalse' part.
+            var node = createNode(201 /* ConditionalExpression */, leftOperand.pos);
             node.condition = leftOperand;
             node.questionToken = questionToken;
             node.whenTrue = doOutsideOfContext(disallowInAndDecoratorContext, parseAssignmentExpressionOrHigher);
-            node.colonToken = parseExpectedToken(56);
+            node.colonToken = parseExpectedToken(56 /* ColonToken */);
             node.whenFalse = ts.nodeIsPresent(node.colonToken)
                 ? parseAssignmentExpressionOrHigher()
-                : createMissingNode(71, false, ts.Diagnostics._0_expected, ts.tokenToString(56));
+                : createMissingNode(71 /* Identifier */, /*reportAtCurrentPosition*/ false, ts.Diagnostics._0_expected, ts.tokenToString(56 /* ColonToken */));
             return finishNode(node);
         }
         function parseBinaryExpressionOrHigher(precedence) {
@@ -14453,22 +18247,50 @@ var ts;
             return parseBinaryExpressionRest(precedence, leftOperand);
         }
         function isInOrOfKeyword(t) {
-            return t === 92 || t === 145;
+            return t === 92 /* InKeyword */ || t === 145 /* OfKeyword */;
         }
         function parseBinaryExpressionRest(precedence, leftOperand) {
             while (true) {
+                // We either have a binary operator here, or we're finished.  We call
+                // reScanGreaterToken so that we merge token sequences like > and = into >=
                 reScanGreaterToken();
                 var newPrecedence = ts.getBinaryOperatorPrecedence(token());
-                var consumeCurrentOperator = token() === 40 ?
+                // Check the precedence to see if we should "take" this operator
+                // - For left associative operator (all operator but **), consume the operator,
+                //   recursively call the function below, and parse binaryExpression as a rightOperand
+                //   of the caller if the new precedence of the operator is greater then or equal to the current precedence.
+                //   For example:
+                //      a - b - c;
+                //            ^token; leftOperand = b. Return b to the caller as a rightOperand
+                //      a * b - c
+                //            ^token; leftOperand = b. Return b to the caller as a rightOperand
+                //      a - b * c;
+                //            ^token; leftOperand = b. Return b * c to the caller as a rightOperand
+                // - For right associative operator (**), consume the operator, recursively call the function
+                //   and parse binaryExpression as a rightOperand of the caller if the new precedence of
+                //   the operator is strictly grater than the current precedence
+                //   For example:
+                //      a ** b ** c;
+                //             ^^token; leftOperand = b. Return b ** c to the caller as a rightOperand
+                //      a - b ** c;
+                //            ^^token; leftOperand = b. Return b ** c to the caller as a rightOperand
+                //      a ** b - c
+                //             ^token; leftOperand = b. Return b to the caller as a rightOperand
+                var consumeCurrentOperator = token() === 40 /* AsteriskAsteriskToken */ ?
                     newPrecedence >= precedence :
                     newPrecedence > precedence;
                 if (!consumeCurrentOperator) {
                     break;
                 }
-                if (token() === 92 && inDisallowInContext()) {
+                if (token() === 92 /* InKeyword */ && inDisallowInContext()) {
                     break;
                 }
-                if (token() === 118) {
+                if (token() === 118 /* AsKeyword */) {
+                    // Make sure we *do* perform ASI for constructs like this:
+                    //    var x = foo
+                    //    as (Bar)
+                    // This should be parsed as an initialized variable, followed
+                    // by a function call to 'as' with the argument 'Bar'
                     if (scanner.hasPrecedingLineBreak()) {
                         break;
                     }
@@ -14484,77 +18306,105 @@ var ts;
             return leftOperand;
         }
         function isBinaryOperator() {
-            if (inDisallowInContext() && token() === 92) {
+            if (inDisallowInContext() && token() === 92 /* InKeyword */) {
                 return false;
             }
             return ts.getBinaryOperatorPrecedence(token()) > 0;
         }
         function makeBinaryExpression(left, operatorToken, right) {
-            var node = createNode(200, left.pos);
+            var node = createNode(200 /* BinaryExpression */, left.pos);
             node.left = left;
             node.operatorToken = operatorToken;
             node.right = right;
             return finishNode(node);
         }
         function makeAsExpression(left, right) {
-            var node = createNode(208, left.pos);
+            var node = createNode(208 /* AsExpression */, left.pos);
             node.expression = left;
             node.type = right;
             return finishNode(node);
         }
         function parsePrefixUnaryExpression() {
-            var node = createNode(198);
+            var node = createNode(198 /* PrefixUnaryExpression */);
             node.operator = token();
             nextToken();
             node.operand = parseSimpleUnaryExpression();
             return finishNode(node);
         }
         function parseDeleteExpression() {
-            var node = createNode(194);
+            var node = createNode(194 /* DeleteExpression */);
             nextToken();
             node.expression = parseSimpleUnaryExpression();
             return finishNode(node);
         }
         function parseTypeOfExpression() {
-            var node = createNode(195);
+            var node = createNode(195 /* TypeOfExpression */);
             nextToken();
             node.expression = parseSimpleUnaryExpression();
             return finishNode(node);
         }
         function parseVoidExpression() {
-            var node = createNode(196);
+            var node = createNode(196 /* VoidExpression */);
             nextToken();
             node.expression = parseSimpleUnaryExpression();
             return finishNode(node);
         }
         function isAwaitExpression() {
-            if (token() === 121) {
+            if (token() === 121 /* AwaitKeyword */) {
                 if (inAwaitContext()) {
                     return true;
                 }
+                // here we are using similar heuristics as 'isYieldExpression'
                 return lookAhead(nextTokenIsIdentifierOrKeywordOrLiteralOnSameLine);
             }
             return false;
         }
         function parseAwaitExpression() {
-            var node = createNode(197);
+            var node = createNode(197 /* AwaitExpression */);
             nextToken();
             node.expression = parseSimpleUnaryExpression();
             return finishNode(node);
         }
+        /**
+         * Parse ES7 exponential expression and await expression
+         *
+         * ES7 ExponentiationExpression:
+         *      1) UnaryExpression[?Yield]
+         *      2) UpdateExpression[?Yield] ** ExponentiationExpression[?Yield]
+         *
+         */
         function parseUnaryExpressionOrHigher() {
+            /**
+             * ES7 UpdateExpression:
+             *      1) LeftHandSideExpression[?Yield]
+             *      2) LeftHandSideExpression[?Yield][no LineTerminator here]++
+             *      3) LeftHandSideExpression[?Yield][no LineTerminator here]--
+             *      4) ++UnaryExpression[?Yield]
+             *      5) --UnaryExpression[?Yield]
+             */
             if (isUpdateExpression()) {
                 var updateExpression = parseUpdateExpression();
-                return token() === 40 ?
+                return token() === 40 /* AsteriskAsteriskToken */ ?
                     parseBinaryExpressionRest(ts.getBinaryOperatorPrecedence(token()), updateExpression) :
                     updateExpression;
             }
+            /**
+             * ES7 UnaryExpression:
+             *      1) UpdateExpression[?yield]
+             *      2) delete UpdateExpression[?yield]
+             *      3) void UpdateExpression[?yield]
+             *      4) typeof UpdateExpression[?yield]
+             *      5) + UpdateExpression[?yield]
+             *      6) - UpdateExpression[?yield]
+             *      7) ~ UpdateExpression[?yield]
+             *      8) ! UpdateExpression[?yield]
+             */
             var unaryOperator = token();
             var simpleUnaryExpression = parseSimpleUnaryExpression();
-            if (token() === 40) {
+            if (token() === 40 /* AsteriskAsteriskToken */) {
                 var pos = ts.skipTrivia(sourceText, simpleUnaryExpression.pos);
                 var end = simpleUnaryExpression.end;
-                if (simpleUnaryExpression.kind === 190) {
+                if (simpleUnaryExpression.kind === 190 /* TypeAssertionExpression */) {
                     parseErrorAt(pos, end, ts.Diagnostics.A_type_assertion_expression_is_not_allowed_in_the_left_hand_side_of_an_exponentiation_expression_Consider_enclosing_the_expression_in_parentheses);
                 }
                 else {
@@ -14563,63 +18413,108 @@ var ts;
             }
             return simpleUnaryExpression;
         }
+        /**
+         * Parse ES7 simple-unary expression or higher:
+         *
+         * ES7 UnaryExpression:
+         *      1) UpdateExpression[?yield]
+         *      2) delete UnaryExpression[?yield]
+         *      3) void UnaryExpression[?yield]
+         *      4) typeof UnaryExpression[?yield]
+         *      5) + UnaryExpression[?yield]
+         *      6) - UnaryExpression[?yield]
+         *      7) ~ UnaryExpression[?yield]
+         *      8) ! UnaryExpression[?yield]
+         *      9) [+Await] await UnaryExpression[?yield]
+         */
         function parseSimpleUnaryExpression() {
             switch (token()) {
-                case 37:
-                case 38:
-                case 52:
-                case 51:
+                case 37 /* PlusToken */:
+                case 38 /* MinusToken */:
+                case 52 /* TildeToken */:
+                case 51 /* ExclamationToken */:
                     return parsePrefixUnaryExpression();
-                case 80:
+                case 80 /* DeleteKeyword */:
                     return parseDeleteExpression();
-                case 103:
+                case 103 /* TypeOfKeyword */:
                     return parseTypeOfExpression();
-                case 105:
+                case 105 /* VoidKeyword */:
                     return parseVoidExpression();
-                case 27:
+                case 27 /* LessThanToken */:
+                    // This is modified UnaryExpression grammar in TypeScript
+                    //  UnaryExpression (modified):
+                    //      < type > UnaryExpression
                     return parseTypeAssertion();
-                case 121:
+                case 121 /* AwaitKeyword */:
                     if (isAwaitExpression()) {
                         return parseAwaitExpression();
                     }
+                // falls through
                 default:
                     return parseUpdateExpression();
             }
         }
+        /**
+         * Check if the current token can possibly be an ES7 increment expression.
+         *
+         * ES7 UpdateExpression:
+         *      LeftHandSideExpression[?Yield]
+         *      LeftHandSideExpression[?Yield][no LineTerminator here]++
+         *      LeftHandSideExpression[?Yield][no LineTerminator here]--
+         *      ++LeftHandSideExpression[?Yield]
+         *      --LeftHandSideExpression[?Yield]
+         */
         function isUpdateExpression() {
+            // This function is called inside parseUnaryExpression to decide
+            // whether to call parseSimpleUnaryExpression or call parseUpdateExpression directly
             switch (token()) {
-                case 37:
-                case 38:
-                case 52:
-                case 51:
-                case 80:
-                case 103:
-                case 105:
-                case 121:
+                case 37 /* PlusToken */:
+                case 38 /* MinusToken */:
+                case 52 /* TildeToken */:
+                case 51 /* ExclamationToken */:
+                case 80 /* DeleteKeyword */:
+                case 103 /* TypeOfKeyword */:
+                case 105 /* VoidKeyword */:
+                case 121 /* AwaitKeyword */:
                     return false;
-                case 27:
-                    if (sourceFile.languageVariant !== 1) {
+                case 27 /* LessThanToken */:
+                    // If we are not in JSX context, we are parsing TypeAssertion which is an UnaryExpression
+                    if (sourceFile.languageVariant !== 1 /* JSX */) {
                         return false;
                     }
+                // We are in JSX context and the token is part of JSXElement.
+                // falls through
                 default:
                     return true;
             }
         }
+        /**
+         * Parse ES7 UpdateExpression. UpdateExpression is used instead of ES6's PostFixExpression.
+         *
+         * ES7 UpdateExpression[yield]:
+         *      1) LeftHandSideExpression[?yield]
+         *      2) LeftHandSideExpression[?yield] [[no LineTerminator here]]++
+         *      3) LeftHandSideExpression[?yield] [[no LineTerminator here]]--
+         *      4) ++LeftHandSideExpression[?yield]
+         *      5) --LeftHandSideExpression[?yield]
+         * In TypeScript (2), (3) are parsed as PostfixUnaryExpression. (4), (5) are parsed as PrefixUnaryExpression
+         */
         function parseUpdateExpression() {
-            if (token() === 43 || token() === 44) {
-                var node = createNode(198);
+            if (token() === 43 /* PlusPlusToken */ || token() === 44 /* MinusMinusToken */) {
+                var node = createNode(198 /* PrefixUnaryExpression */);
                 node.operator = token();
                 nextToken();
                 node.operand = parseLeftHandSideExpressionOrHigher();
                 return finishNode(node);
             }
-            else if (sourceFile.languageVariant === 1 && token() === 27 && lookAhead(nextTokenIsIdentifierOrKeywordOrGreaterThan)) {
-                return parseJsxElementOrSelfClosingElementOrFragment(true);
+            else if (sourceFile.languageVariant === 1 /* JSX */ && token() === 27 /* LessThanToken */ && lookAhead(nextTokenIsIdentifierOrKeywordOrGreaterThan)) {
+                // JSXElement is part of primaryExpression
+                return parseJsxElementOrSelfClosingElementOrFragment(/*inExpressionContext*/ true);
             }
             var expression = parseLeftHandSideExpressionOrHigher();
             ts.Debug.assert(ts.isLeftHandSideExpression(expression));
-            if ((token() === 43 || token() === 44) && !scanner.hasPrecedingLineBreak()) {
-                var node = createNode(199, expression.pos);
+            if ((token() === 43 /* PlusPlusToken */ || token() === 44 /* MinusMinusToken */) && !scanner.hasPrecedingLineBreak()) {
+                var node = createNode(199 /* PostfixUnaryExpression */, expression.pos);
                 node.operand = expression;
                 node.operator = token();
                 nextToken();
@@ -14628,51 +18523,139 @@ var ts;
             return expression;
         }
         function parseLeftHandSideExpressionOrHigher() {
+            // Original Ecma:
+            // LeftHandSideExpression: See 11.2
+            //      NewExpression
+            //      CallExpression
+            //
+            // Our simplification:
+            //
+            // LeftHandSideExpression: See 11.2
+            //      MemberExpression
+            //      CallExpression
+            //
+            // See comment in parseMemberExpressionOrHigher on how we replaced NewExpression with
+            // MemberExpression to make our lives easier.
+            //
+            // to best understand the below code, it's important to see how CallExpression expands
+            // out into its own productions:
+            //
+            // CallExpression:
+            //      MemberExpression Arguments
+            //      CallExpression Arguments
+            //      CallExpression[Expression]
+            //      CallExpression.IdentifierName
+            //      import (AssignmentExpression)
+            //      super Arguments
+            //      super.IdentifierName
+            //
+            // Because of the recursion in these calls, we need to bottom out first. There are three
+            // bottom out states we can run into: 1) We see 'super' which must start either of
+            // the last two CallExpression productions. 2) We see 'import' which must start import call.
+            // 3)we have a MemberExpression which either completes the LeftHandSideExpression,
+            // or starts the beginning of the first four CallExpression productions.
             var expression;
-            if (token() === 91) {
+            if (token() === 91 /* ImportKeyword */) {
                 if (lookAhead(nextTokenIsOpenParenOrLessThan)) {
-                    sourceFile.flags |= 524288;
+                    // We don't want to eagerly consume all import keyword as import call expression so we look ahead to find "("
+                    // For example:
+                    //      var foo3 = require("subfolder
+                    //      import * as foo1 from "module-from-node
+                    // We want this import to be a statement rather than import call expression
+                    sourceFile.flags |= 524288 /* PossiblyContainsDynamicImport */;
                     expression = parseTokenNode();
                 }
                 else if (lookAhead(nextTokenIsDot)) {
+                    // This is an 'import.*' metaproperty (i.e. 'import.meta')
                     var fullStart = scanner.getStartPos();
-                    nextToken();
-                    nextToken();
-                    var node = createNode(210, fullStart);
-                    node.keywordToken = 91;
+                    nextToken(); // advance past the 'import'
+                    nextToken(); // advance past the dot
+                    var node = createNode(210 /* MetaProperty */, fullStart);
+                    node.keywordToken = 91 /* ImportKeyword */;
                     node.name = parseIdentifierName();
                     expression = finishNode(node);
-                    sourceFile.flags |= 1048576;
+                    sourceFile.flags |= 1048576 /* PossiblyContainsImportMeta */;
                 }
                 else {
                     expression = parseMemberExpressionOrHigher();
                 }
             }
             else {
-                expression = token() === 97 ? parseSuperExpression() : parseMemberExpressionOrHigher();
+                expression = token() === 97 /* SuperKeyword */ ? parseSuperExpression() : parseMemberExpressionOrHigher();
             }
+            // Now, we *may* be complete.  However, we might have consumed the start of a
+            // CallExpression.  As such, we need to consume the rest of it here to be complete.
             return parseCallExpressionRest(expression);
         }
         function parseMemberExpressionOrHigher() {
+            // Note: to make our lives simpler, we decompose the NewExpression productions and
+            // place ObjectCreationExpression and FunctionExpression into PrimaryExpression.
+            // like so:
+            //
+            //   PrimaryExpression : See 11.1
+            //      this
+            //      Identifier
+            //      Literal
+            //      ArrayLiteral
+            //      ObjectLiteral
+            //      (Expression)
+            //      FunctionExpression
+            //      new MemberExpression Arguments?
+            //
+            //   MemberExpression : See 11.2
+            //      PrimaryExpression
+            //      MemberExpression[Expression]
+            //      MemberExpression.IdentifierName
+            //
+            //   CallExpression : See 11.2
+            //      MemberExpression
+            //      CallExpression Arguments
+            //      CallExpression[Expression]
+            //      CallExpression.IdentifierName
+            //
+            // Technically this is ambiguous.  i.e. CallExpression defines:
+            //
+            //   CallExpression:
+            //      CallExpression Arguments
+            //
+            // If you see: "new Foo()"
+            //
+            // Then that could be treated as a single ObjectCreationExpression, or it could be
+            // treated as the invocation of "new Foo".  We disambiguate that in code (to match
+            // the original grammar) by making sure that if we see an ObjectCreationExpression
+            // we always consume arguments if they are there. So we treat "new Foo()" as an
+            // object creation only, and not at all as an invocation.  Another way to think
+            // about this is that for every "new" that we see, we will consume an argument list if
+            // it is there as part of the *associated* object creation node.  Any additional
+            // argument lists we see, will become invocation expressions.
+            //
+            // Because there are no other places in the grammar now that refer to FunctionExpression
+            // or ObjectCreationExpression, it is safe to push down into the PrimaryExpression
+            // production.
+            //
+            // Because CallExpression and MemberExpression are left recursive, we need to bottom out
+            // of the recursion immediately.  So we parse out a primary expression to start with.
             var expression = parsePrimaryExpression();
             return parseMemberExpressionRest(expression);
         }
         function parseSuperExpression() {
             var expression = parseTokenNode();
-            if (token() === 19 || token() === 23 || token() === 21) {
+            if (token() === 19 /* OpenParenToken */ || token() === 23 /* DotToken */ || token() === 21 /* OpenBracketToken */) {
                 return expression;
             }
-            var node = createNode(185, expression.pos);
+            // If we have seen "super" it must be followed by '(' or '.'.
+            // If it wasn't then just try to parse out a '.' and report an error.
+            var node = createNode(185 /* PropertyAccessExpression */, expression.pos);
             node.expression = expression;
-            parseExpectedToken(23, ts.Diagnostics.super_must_be_followed_by_an_argument_list_or_member_access);
-            node.name = parseRightSideOfDot(true);
+            parseExpectedToken(23 /* DotToken */, ts.Diagnostics.super_must_be_followed_by_an_argument_list_or_member_access);
+            node.name = parseRightSideOfDot(/*allowIdentifierNames*/ true);
             return finishNode(node);
         }
         function parseJsxElementOrSelfClosingElementOrFragment(inExpressionContext) {
             var opening = parseJsxOpeningOrSelfClosingElementOrOpeningFragment(inExpressionContext);
             var result;
-            if (opening.kind === 257) {
-                var node = createNode(255, opening.pos);
+            if (opening.kind === 257 /* JsxOpeningElement */) {
+                var node = createNode(255 /* JsxElement */, opening.pos);
                 node.openingElement = opening;
                 node.children = parseJsxChildren(node.openingElement);
                 node.closingElement = parseJsxClosingElement(inExpressionContext);
@@ -14681,26 +18664,34 @@ var ts;
                 }
                 result = finishNode(node);
             }
-            else if (opening.kind === 260) {
-                var node = createNode(259, opening.pos);
+            else if (opening.kind === 260 /* JsxOpeningFragment */) {
+                var node = createNode(259 /* JsxFragment */, opening.pos);
                 node.openingFragment = opening;
                 node.children = parseJsxChildren(node.openingFragment);
                 node.closingFragment = parseJsxClosingFragment(inExpressionContext);
                 result = finishNode(node);
             }
             else {
-                ts.Debug.assert(opening.kind === 256);
+                ts.Debug.assert(opening.kind === 256 /* JsxSelfClosingElement */);
+                // Nothing else to do for self-closing elements
                 result = opening;
             }
-            if (inExpressionContext && token() === 27) {
-                var invalidElement = tryParse(function () { return parseJsxElementOrSelfClosingElementOrFragment(true); });
+            // If the user writes the invalid code '<div></div><div></div>' in an expression context (i.e. not wrapped in
+            // an enclosing tag), we'll naively try to parse   ^ this as a 'less than' operator and the remainder of the tag
+            // as garbage, which will cause the formatter to badly mangle the JSX. Perform a speculative parse of a JSX
+            // element if we see a < token so that we can wrap it in a synthetic binary expression so the formatter
+            // does less damage and we can report a better error.
+            // Since JSX elements are invalid < operands anyway, this lookahead parse will only occur in error scenarios
+            // of one sort or another.
+            if (inExpressionContext && token() === 27 /* LessThanToken */) {
+                var invalidElement = tryParse(function () { return parseJsxElementOrSelfClosingElementOrFragment(/*inExpressionContext*/ true); });
                 if (invalidElement) {
                     parseErrorAtCurrentToken(ts.Diagnostics.JSX_expressions_must_have_one_parent_element);
-                    var badNode = createNode(200, result.pos);
+                    var badNode = createNode(200 /* BinaryExpression */, result.pos);
                     badNode.end = invalidElement.end;
                     badNode.left = result;
                     badNode.right = invalidElement;
-                    badNode.operatorToken = createMissingNode(26, false, undefined);
+                    badNode.operatorToken = createMissingNode(26 /* CommaToken */, /*reportAtCurrentPosition*/ false, /*diagnosticMessage*/ undefined); // TODO: GH#18217
                     badNode.operatorToken.pos = badNode.operatorToken.end = badNode.right.pos;
                     return badNode;
                 }
@@ -14708,14 +18699,16 @@ var ts;
             return result;
         }
         function parseJsxText() {
-            var node = createNode(10);
-            node.containsOnlyWhiteSpaces = currentToken === 11;
+            var node = createNode(10 /* JsxText */);
+            node.containsOnlyWhiteSpaces = currentToken === 11 /* JsxTextAllWhiteSpaces */;
             currentToken = scanner.scanJsxToken();
             return finishNode(node);
         }
         function parseJsxChild(openingTag, token) {
             switch (token) {
-                case 1:
+                case 1 /* EndOfFileToken */:
+                    // If we hit EOF, issue the error at the tag that lacks the closing element
+                    // rather than at the end of the file (which is useless)
                     if (ts.isJsxOpeningFragment(openingTag)) {
                         parseErrorAtRange(openingTag, ts.Diagnostics.JSX_fragment_has_no_corresponding_closing_tag);
                     }
@@ -14723,16 +18716,16 @@ var ts;
                         parseErrorAtRange(openingTag.tagName, ts.Diagnostics.JSX_element_0_has_no_corresponding_closing_tag, ts.getTextOfNodeFromSourceText(sourceText, openingTag.tagName));
                     }
                     return undefined;
-                case 28:
-                case 7:
+                case 28 /* LessThanSlashToken */:
+                case 7 /* ConflictMarkerTrivia */:
                     return undefined;
-                case 10:
-                case 11:
+                case 10 /* JsxText */:
+                case 11 /* JsxTextAllWhiteSpaces */:
                     return parseJsxText();
-                case 17:
-                    return parseJsxExpression(false);
-                case 27:
-                    return parseJsxElementOrSelfClosingElementOrFragment(false);
+                case 17 /* OpenBraceToken */:
+                    return parseJsxExpression(/*inExpressionContext*/ false);
+                case 27 /* LessThanToken */:
+                    return parseJsxElementOrSelfClosingElementOrFragment(/*inExpressionContext*/ false);
                 default:
                     return ts.Debug.assertNever(token);
             }
@@ -14741,7 +18734,7 @@ var ts;
             var list = [];
             var listPos = getNodePos();
             var saveParsingContext = parsingContext;
-            parsingContext |= 1 << 14;
+            parsingContext |= 1 << 14 /* JsxChildren */;
             while (true) {
                 var child = parseJsxChild(openingTag, currentToken = scanner.reScanJsxToken());
                 if (!child)
@@ -14752,15 +18745,16 @@ var ts;
             return createNodeArray(list, listPos);
         }
         function parseJsxAttributes() {
-            var jsxAttributes = createNode(263);
-            jsxAttributes.properties = parseList(13, parseJsxAttribute);
+            var jsxAttributes = createNode(263 /* JsxAttributes */);
+            jsxAttributes.properties = parseList(13 /* JsxAttributes */, parseJsxAttribute);
             return finishNode(jsxAttributes);
         }
         function parseJsxOpeningOrSelfClosingElementOrOpeningFragment(inExpressionContext) {
             var fullStart = scanner.getStartPos();
-            parseExpected(27);
-            if (token() === 29) {
-                var node_1 = createNode(260, fullStart);
+            parseExpected(27 /* LessThanToken */);
+            if (token() === 29 /* GreaterThanToken */) {
+                // See below for explanation of scanJsxText
+                var node_1 = createNode(260 /* JsxOpeningFragment */, fullStart);
                 scanJsxText();
                 return finishNode(node_1);
             }
@@ -14768,20 +18762,23 @@ var ts;
             var typeArguments = tryParseTypeArguments();
             var attributes = parseJsxAttributes();
             var node;
-            if (token() === 29) {
-                node = createNode(257, fullStart);
+            if (token() === 29 /* GreaterThanToken */) {
+                // Closing tag, so scan the immediately-following text with the JSX scanning instead
+                // of regular scanning to avoid treating illegal characters (e.g. '#') as immediate
+                // scanning errors
+                node = createNode(257 /* JsxOpeningElement */, fullStart);
                 scanJsxText();
             }
             else {
-                parseExpected(41);
+                parseExpected(41 /* SlashToken */);
                 if (inExpressionContext) {
-                    parseExpected(29);
+                    parseExpected(29 /* GreaterThanToken */);
                 }
                 else {
-                    parseExpected(29, undefined, false);
+                    parseExpected(29 /* GreaterThanToken */, /*diagnostic*/ undefined, /*shouldAdvance*/ false);
                     scanJsxText();
                 }
-                node = createNode(256, fullStart);
+                node = createNode(256 /* JsxSelfClosingElement */, fullStart);
             }
             node.tagName = tagName;
             node.typeArguments = typeArguments;
@@ -14790,119 +18787,125 @@ var ts;
         }
         function parseJsxElementName() {
             scanJsxIdentifier();
-            var expression = token() === 99 ?
+            // JsxElement can have name in the form of
+            //      propertyAccessExpression
+            //      primaryExpression in the form of an identifier and "this" keyword
+            // We can't just simply use parseLeftHandSideExpressionOrHigher because then we will start consider class,function etc as a keyword
+            // We only want to consider "this" as a primaryExpression
+            var expression = token() === 99 /* ThisKeyword */ ?
                 parseTokenNode() : parseIdentifierName();
-            while (parseOptional(23)) {
-                var propertyAccess = createNode(185, expression.pos);
+            while (parseOptional(23 /* DotToken */)) {
+                var propertyAccess = createNode(185 /* PropertyAccessExpression */, expression.pos);
                 propertyAccess.expression = expression;
-                propertyAccess.name = parseRightSideOfDot(true);
+                propertyAccess.name = parseRightSideOfDot(/*allowIdentifierNames*/ true);
                 expression = finishNode(propertyAccess);
             }
             return expression;
         }
         function parseJsxExpression(inExpressionContext) {
-            var node = createNode(265);
-            if (!parseExpected(17)) {
+            var node = createNode(265 /* JsxExpression */);
+            if (!parseExpected(17 /* OpenBraceToken */)) {
                 return undefined;
             }
-            if (token() !== 18) {
-                node.dotDotDotToken = parseOptionalToken(24);
+            if (token() !== 18 /* CloseBraceToken */) {
+                node.dotDotDotToken = parseOptionalToken(24 /* DotDotDotToken */);
                 node.expression = parseAssignmentExpressionOrHigher();
             }
             if (inExpressionContext) {
-                parseExpected(18);
+                parseExpected(18 /* CloseBraceToken */);
             }
             else {
-                parseExpected(18, undefined, false);
+                parseExpected(18 /* CloseBraceToken */, /*message*/ undefined, /*shouldAdvance*/ false);
                 scanJsxText();
             }
             return finishNode(node);
         }
         function parseJsxAttribute() {
-            if (token() === 17) {
+            if (token() === 17 /* OpenBraceToken */) {
                 return parseJsxSpreadAttribute();
             }
             scanJsxIdentifier();
-            var node = createNode(262);
+            var node = createNode(262 /* JsxAttribute */);
             node.name = parseIdentifierName();
-            if (token() === 58) {
+            if (token() === 58 /* EqualsToken */) {
                 switch (scanJsxAttributeValue()) {
-                    case 9:
+                    case 9 /* StringLiteral */:
                         node.initializer = parseLiteralNode();
                         break;
                     default:
-                        node.initializer = parseJsxExpression(true);
+                        node.initializer = parseJsxExpression(/*inExpressionContext*/ true);
                         break;
                 }
             }
             return finishNode(node);
         }
         function parseJsxSpreadAttribute() {
-            var node = createNode(264);
-            parseExpected(17);
-            parseExpected(24);
+            var node = createNode(264 /* JsxSpreadAttribute */);
+            parseExpected(17 /* OpenBraceToken */);
+            parseExpected(24 /* DotDotDotToken */);
             node.expression = parseExpression();
-            parseExpected(18);
+            parseExpected(18 /* CloseBraceToken */);
             return finishNode(node);
         }
         function parseJsxClosingElement(inExpressionContext) {
-            var node = createNode(258);
-            parseExpected(28);
+            var node = createNode(258 /* JsxClosingElement */);
+            parseExpected(28 /* LessThanSlashToken */);
             node.tagName = parseJsxElementName();
             if (inExpressionContext) {
-                parseExpected(29);
+                parseExpected(29 /* GreaterThanToken */);
             }
             else {
-                parseExpected(29, undefined, false);
+                parseExpected(29 /* GreaterThanToken */, /*diagnostic*/ undefined, /*shouldAdvance*/ false);
                 scanJsxText();
             }
             return finishNode(node);
         }
         function parseJsxClosingFragment(inExpressionContext) {
-            var node = createNode(261);
-            parseExpected(28);
+            var node = createNode(261 /* JsxClosingFragment */);
+            parseExpected(28 /* LessThanSlashToken */);
             if (ts.tokenIsIdentifierOrKeyword(token())) {
                 parseErrorAtRange(parseJsxElementName(), ts.Diagnostics.Expected_corresponding_closing_tag_for_JSX_fragment);
             }
             if (inExpressionContext) {
-                parseExpected(29);
+                parseExpected(29 /* GreaterThanToken */);
             }
             else {
-                parseExpected(29, undefined, false);
+                parseExpected(29 /* GreaterThanToken */, /*diagnostic*/ undefined, /*shouldAdvance*/ false);
                 scanJsxText();
             }
             return finishNode(node);
         }
         function parseTypeAssertion() {
-            var node = createNode(190);
-            parseExpected(27);
+            var node = createNode(190 /* TypeAssertionExpression */);
+            parseExpected(27 /* LessThanToken */);
             node.type = parseType();
-            parseExpected(29);
+            parseExpected(29 /* GreaterThanToken */);
             node.expression = parseSimpleUnaryExpression();
             return finishNode(node);
         }
         function parseMemberExpressionRest(expression) {
             while (true) {
-                var dotToken = parseOptionalToken(23);
+                var dotToken = parseOptionalToken(23 /* DotToken */);
                 if (dotToken) {
-                    var propertyAccess = createNode(185, expression.pos);
+                    var propertyAccess = createNode(185 /* PropertyAccessExpression */, expression.pos);
                     propertyAccess.expression = expression;
-                    propertyAccess.name = parseRightSideOfDot(true);
+                    propertyAccess.name = parseRightSideOfDot(/*allowIdentifierNames*/ true);
                     expression = finishNode(propertyAccess);
                     continue;
                 }
-                if (token() === 51 && !scanner.hasPrecedingLineBreak()) {
+                if (token() === 51 /* ExclamationToken */ && !scanner.hasPrecedingLineBreak()) {
                     nextToken();
-                    var nonNullExpression = createNode(209, expression.pos);
+                    var nonNullExpression = createNode(209 /* NonNullExpression */, expression.pos);
                     nonNullExpression.expression = expression;
                     expression = finishNode(nonNullExpression);
                     continue;
                 }
-                if (!inDecoratorContext() && parseOptional(21)) {
-                    var indexedAccess = createNode(186, expression.pos);
+                // when in the [Decorator] context, we do not parse ElementAccess as it could be part of a ComputedPropertyName
+                if (!inDecoratorContext() && parseOptional(21 /* OpenBracketToken */)) {
+                    var indexedAccess = createNode(186 /* ElementAccessExpression */, expression.pos);
                     indexedAccess.expression = expression;
-                    if (token() === 22) {
-                        indexedAccess.argumentExpression = createMissingNode(71, true, ts.Diagnostics.An_element_access_expression_should_take_an_argument);
+                    if (token() === 22 /* CloseBracketToken */) {
+                        indexedAccess.argumentExpression = createMissingNode(71 /* Identifier */, /*reportAtCurrentPosition*/ true, ts.Diagnostics.An_element_access_expression_should_take_an_argument);
                     }
                     else {
                         var argument = allowInAnd(parseExpression);
@@ -14911,25 +18914,25 @@ var ts;
                         }
                         indexedAccess.argumentExpression = argument;
                     }
-                    parseExpected(22);
+                    parseExpected(22 /* CloseBracketToken */);
                     expression = finishNode(indexedAccess);
                     continue;
                 }
                 if (isTemplateStartOfTaggedTemplate()) {
-                    expression = parseTaggedTemplateRest(expression, undefined);
+                    expression = parseTaggedTemplateRest(expression, /*typeArguments*/ undefined);
                     continue;
                 }
                 return expression;
             }
         }
         function isTemplateStartOfTaggedTemplate() {
-            return token() === 13 || token() === 14;
+            return token() === 13 /* NoSubstitutionTemplateLiteral */ || token() === 14 /* TemplateHead */;
         }
         function parseTaggedTemplateRest(tag, typeArguments) {
-            var tagExpression = createNode(189, tag.pos);
+            var tagExpression = createNode(189 /* TaggedTemplateExpression */, tag.pos);
             tagExpression.tag = tag;
             tagExpression.typeArguments = typeArguments;
-            tagExpression.template = token() === 13
+            tagExpression.template = token() === 13 /* NoSubstitutionTemplateLiteral */
                 ? parseLiteralNode()
                 : parseTemplateExpression();
             return finishNode(tagExpression);
@@ -14937,7 +18940,11 @@ var ts;
         function parseCallExpressionRest(expression) {
             while (true) {
                 expression = parseMemberExpressionRest(expression);
-                if (token() === 27) {
+                if (token() === 27 /* LessThanToken */) {
+                    // See if this is the start of a generic invocation.  If so, consume it and
+                    // keep checking for postfix expressions.  Otherwise, it's just a '<' that's
+                    // part of an arithmetic expression.  Break out so we consume it higher in the
+                    // stack.
                     var typeArguments = tryParse(parseTypeArgumentsInExpression);
                     if (!typeArguments) {
                         return expression;
@@ -14946,15 +18953,15 @@ var ts;
                         expression = parseTaggedTemplateRest(expression, typeArguments);
                         continue;
                     }
-                    var callExpr = createNode(187, expression.pos);
+                    var callExpr = createNode(187 /* CallExpression */, expression.pos);
                     callExpr.expression = expression;
                     callExpr.typeArguments = typeArguments;
                     callExpr.arguments = parseArgumentList();
                     expression = finishNode(callExpr);
                     continue;
                 }
-                else if (token() === 19) {
-                    var callExpr = createNode(187, expression.pos);
+                else if (token() === 19 /* OpenParenToken */) {
+                    var callExpr = createNode(187 /* CallExpression */, expression.pos);
                     callExpr.expression = expression;
                     callExpr.arguments = parseArgumentList();
                     expression = finishNode(callExpr);
@@ -14964,191 +18971,217 @@ var ts;
             }
         }
         function parseArgumentList() {
-            parseExpected(19);
-            var result = parseDelimitedList(11, parseArgumentExpression);
-            parseExpected(20);
+            parseExpected(19 /* OpenParenToken */);
+            var result = parseDelimitedList(11 /* ArgumentExpressions */, parseArgumentExpression);
+            parseExpected(20 /* CloseParenToken */);
             return result;
         }
         function parseTypeArgumentsInExpression() {
-            if (!parseOptional(27)) {
+            if (!parseOptional(27 /* LessThanToken */)) {
                 return undefined;
             }
-            var typeArguments = parseDelimitedList(19, parseType);
-            if (!parseExpected(29)) {
+            var typeArguments = parseDelimitedList(19 /* TypeArguments */, parseType);
+            if (!parseExpected(29 /* GreaterThanToken */)) {
+                // If it doesn't have the closing `>` then it's definitely not an type argument list.
                 return undefined;
             }
+            // If we have a '<', then only parse this as a argument list if the type arguments
+            // are complete and we have an open paren.  if we don't, rewind and return nothing.
             return typeArguments && canFollowTypeArgumentsInExpression()
                 ? typeArguments
                 : undefined;
         }
         function canFollowTypeArgumentsInExpression() {
             switch (token()) {
-                case 19:
-                case 13:
-                case 14:
-                case 23:
-                case 20:
-                case 22:
-                case 56:
-                case 25:
-                case 55:
-                case 32:
-                case 34:
-                case 33:
-                case 35:
-                case 53:
-                case 54:
-                case 50:
-                case 48:
-                case 49:
-                case 18:
-                case 1:
+                case 19 /* OpenParenToken */: // foo<x>(
+                case 13 /* NoSubstitutionTemplateLiteral */: // foo<T> `...`
+                case 14 /* TemplateHead */: // foo<T> `...${100}...`
+                // these are the only tokens can legally follow a type argument
+                // list. So we definitely want to treat them as type arg lists.
+                case 23 /* DotToken */: // foo<x>.
+                case 20 /* CloseParenToken */: // foo<x>)
+                case 22 /* CloseBracketToken */: // foo<x>]
+                case 56 /* ColonToken */: // foo<x>:
+                case 25 /* SemicolonToken */: // foo<x>;
+                case 55 /* QuestionToken */: // foo<x>?
+                case 32 /* EqualsEqualsToken */: // foo<x> ==
+                case 34 /* EqualsEqualsEqualsToken */: // foo<x> ===
+                case 33 /* ExclamationEqualsToken */: // foo<x> !=
+                case 35 /* ExclamationEqualsEqualsToken */: // foo<x> !==
+                case 53 /* AmpersandAmpersandToken */: // foo<x> &&
+                case 54 /* BarBarToken */: // foo<x> ||
+                case 50 /* CaretToken */: // foo<x> ^
+                case 48 /* AmpersandToken */: // foo<x> &
+                case 49 /* BarToken */: // foo<x> |
+                case 18 /* CloseBraceToken */: // foo<x> }
+                case 1 /* EndOfFileToken */: // foo<x>
+                    // these cases can't legally follow a type arg list.  However, they're not legal
+                    // expressions either.  The user is probably in the middle of a generic type. So
+                    // treat it as such.
                     return true;
-                case 26:
-                case 17:
+                case 26 /* CommaToken */: // foo<x>,
+                case 17 /* OpenBraceToken */: // foo<x> {
+                // We don't want to treat these as type arguments.  Otherwise we'll parse this
+                // as an invocation expression.  Instead, we want to parse out the expression
+                // in isolation from the type arguments.
                 default:
+                    // Anything else treat as an expression.
                     return false;
             }
         }
         function parsePrimaryExpression() {
             switch (token()) {
-                case 8:
-                case 9:
-                case 13:
+                case 8 /* NumericLiteral */:
+                case 9 /* StringLiteral */:
+                case 13 /* NoSubstitutionTemplateLiteral */:
                     return parseLiteralNode();
-                case 99:
-                case 97:
-                case 95:
-                case 101:
-                case 86:
+                case 99 /* ThisKeyword */:
+                case 97 /* SuperKeyword */:
+                case 95 /* NullKeyword */:
+                case 101 /* TrueKeyword */:
+                case 86 /* FalseKeyword */:
                     return parseTokenNode();
-                case 19:
+                case 19 /* OpenParenToken */:
                     return parseParenthesizedExpression();
-                case 21:
+                case 21 /* OpenBracketToken */:
                     return parseArrayLiteralExpression();
-                case 17:
+                case 17 /* OpenBraceToken */:
                     return parseObjectLiteralExpression();
-                case 120:
+                case 120 /* AsyncKeyword */:
+                    // Async arrow functions are parsed earlier in parseAssignmentExpressionOrHigher.
+                    // If we encounter `async [no LineTerminator here] function` then this is an async
+                    // function; otherwise, its an identifier.
                     if (!lookAhead(nextTokenIsFunctionKeywordOnSameLine)) {
                         break;
                     }
                     return parseFunctionExpression();
-                case 75:
+                case 75 /* ClassKeyword */:
                     return parseClassExpression();
-                case 89:
+                case 89 /* FunctionKeyword */:
                     return parseFunctionExpression();
-                case 94:
+                case 94 /* NewKeyword */:
                     return parseNewExpressionOrNewDotTarget();
-                case 41:
-                case 63:
-                    if (reScanSlashToken() === 12) {
+                case 41 /* SlashToken */:
+                case 63 /* SlashEqualsToken */:
+                    if (reScanSlashToken() === 12 /* RegularExpressionLiteral */) {
                         return parseLiteralNode();
                     }
                     break;
-                case 14:
+                case 14 /* TemplateHead */:
                     return parseTemplateExpression();
             }
             return parseIdentifier(ts.Diagnostics.Expression_expected);
         }
         function parseParenthesizedExpression() {
-            var node = createNodeWithJSDoc(191);
-            parseExpected(19);
+            var node = createNodeWithJSDoc(191 /* ParenthesizedExpression */);
+            parseExpected(19 /* OpenParenToken */);
             node.expression = allowInAnd(parseExpression);
-            parseExpected(20);
+            parseExpected(20 /* CloseParenToken */);
             return finishNode(node);
         }
         function parseSpreadElement() {
-            var node = createNode(204);
-            parseExpected(24);
+            var node = createNode(204 /* SpreadElement */);
+            parseExpected(24 /* DotDotDotToken */);
             node.expression = parseAssignmentExpressionOrHigher();
             return finishNode(node);
         }
         function parseArgumentOrArrayLiteralElement() {
-            return token() === 24 ? parseSpreadElement() :
-                token() === 26 ? createNode(206) :
+            return token() === 24 /* DotDotDotToken */ ? parseSpreadElement() :
+                token() === 26 /* CommaToken */ ? createNode(206 /* OmittedExpression */) :
                     parseAssignmentExpressionOrHigher();
         }
         function parseArgumentExpression() {
             return doOutsideOfContext(disallowInAndDecoratorContext, parseArgumentOrArrayLiteralElement);
         }
         function parseArrayLiteralExpression() {
-            var node = createNode(183);
-            parseExpected(21);
+            var node = createNode(183 /* ArrayLiteralExpression */);
+            parseExpected(21 /* OpenBracketToken */);
             if (scanner.hasPrecedingLineBreak()) {
                 node.multiLine = true;
             }
-            node.elements = parseDelimitedList(15, parseArgumentOrArrayLiteralElement);
-            parseExpected(22);
+            node.elements = parseDelimitedList(15 /* ArrayLiteralMembers */, parseArgumentOrArrayLiteralElement);
+            parseExpected(22 /* CloseBracketToken */);
             return finishNode(node);
         }
         function parseObjectLiteralElement() {
-            var node = createNodeWithJSDoc(0);
-            if (parseOptionalToken(24)) {
-                node.kind = 272;
+            var node = createNodeWithJSDoc(0 /* Unknown */);
+            if (parseOptionalToken(24 /* DotDotDotToken */)) {
+                node.kind = 272 /* SpreadAssignment */;
                 node.expression = parseAssignmentExpressionOrHigher();
                 return finishNode(node);
             }
             node.decorators = parseDecorators();
             node.modifiers = parseModifiers();
-            if (parseContextualModifier(125)) {
-                return parseAccessorDeclaration(node, 156);
+            if (parseContextualModifier(125 /* GetKeyword */)) {
+                return parseAccessorDeclaration(node, 156 /* GetAccessor */);
             }
-            if (parseContextualModifier(136)) {
-                return parseAccessorDeclaration(node, 157);
+            if (parseContextualModifier(136 /* SetKeyword */)) {
+                return parseAccessorDeclaration(node, 157 /* SetAccessor */);
             }
-            var asteriskToken = parseOptionalToken(39);
+            var asteriskToken = parseOptionalToken(39 /* AsteriskToken */);
             var tokenIsIdentifier = isIdentifier();
             node.name = parsePropertyName();
-            node.questionToken = parseOptionalToken(55);
-            if (asteriskToken || token() === 19 || token() === 27) {
+            // Disallowing of optional property assignments happens in the grammar checker.
+            node.questionToken = parseOptionalToken(55 /* QuestionToken */);
+            if (asteriskToken || token() === 19 /* OpenParenToken */ || token() === 27 /* LessThanToken */) {
                 return parseMethodDeclaration(node, asteriskToken);
             }
-            var isShorthandPropertyAssignment = tokenIsIdentifier && (token() === 26 || token() === 18 || token() === 58);
+            // check if it is short-hand property assignment or normal property assignment
+            // NOTE: if token is EqualsToken it is interpreted as CoverInitializedName production
+            // CoverInitializedName[Yield] :
+            //     IdentifierReference[?Yield] Initializer[In, ?Yield]
+            // this is necessary because ObjectLiteral productions are also used to cover grammar for ObjectAssignmentPattern
+            var isShorthandPropertyAssignment = tokenIsIdentifier && (token() === 26 /* CommaToken */ || token() === 18 /* CloseBraceToken */ || token() === 58 /* EqualsToken */);
             if (isShorthandPropertyAssignment) {
-                node.kind = 271;
-                var equalsToken = parseOptionalToken(58);
+                node.kind = 271 /* ShorthandPropertyAssignment */;
+                var equalsToken = parseOptionalToken(58 /* EqualsToken */);
                 if (equalsToken) {
                     node.equalsToken = equalsToken;
                     node.objectAssignmentInitializer = allowInAnd(parseAssignmentExpressionOrHigher);
                 }
             }
             else {
-                node.kind = 270;
-                parseExpected(56);
+                node.kind = 270 /* PropertyAssignment */;
+                parseExpected(56 /* ColonToken */);
                 node.initializer = allowInAnd(parseAssignmentExpressionOrHigher);
             }
             return finishNode(node);
         }
         function parseObjectLiteralExpression() {
-            var node = createNode(184);
-            parseExpected(17);
+            var node = createNode(184 /* ObjectLiteralExpression */);
+            parseExpected(17 /* OpenBraceToken */);
             if (scanner.hasPrecedingLineBreak()) {
                 node.multiLine = true;
             }
-            node.properties = parseDelimitedList(12, parseObjectLiteralElement, true);
-            parseExpected(18);
+            node.properties = parseDelimitedList(12 /* ObjectLiteralMembers */, parseObjectLiteralElement, /*considerSemicolonAsDelimiter*/ true);
+            parseExpected(18 /* CloseBraceToken */);
             return finishNode(node);
         }
         function parseFunctionExpression() {
+            // GeneratorExpression:
+            //      function* BindingIdentifier [Yield][opt](FormalParameters[Yield]){ GeneratorBody }
+            //
+            // FunctionExpression:
+            //      function BindingIdentifier[opt](FormalParameters){ FunctionBody }
             var saveDecoratorContext = inDecoratorContext();
             if (saveDecoratorContext) {
-                setDecoratorContext(false);
+                setDecoratorContext(/*val*/ false);
             }
-            var node = createNodeWithJSDoc(192);
+            var node = createNodeWithJSDoc(192 /* FunctionExpression */);
             node.modifiers = parseModifiers();
-            parseExpected(89);
-            node.asteriskToken = parseOptionalToken(39);
-            var isGenerator = node.asteriskToken ? 1 : 0;
-            var isAsync = ts.hasModifier(node, 256) ? 2 : 0;
+            parseExpected(89 /* FunctionKeyword */);
+            node.asteriskToken = parseOptionalToken(39 /* AsteriskToken */);
+            var isGenerator = node.asteriskToken ? 1 /* Yield */ : 0 /* None */;
+            var isAsync = ts.hasModifier(node, 256 /* Async */) ? 2 /* Await */ : 0 /* None */;
             node.name =
                 isGenerator && isAsync ? doInYieldAndAwaitContext(parseOptionalIdentifier) :
                     isGenerator ? doInYieldContext(parseOptionalIdentifier) :
                         isAsync ? doInAwaitContext(parseOptionalIdentifier) :
                             parseOptionalIdentifier();
-            fillSignature(56, isGenerator | isAsync, node);
+            fillSignature(56 /* ColonToken */, isGenerator | isAsync, node);
             node.body = parseFunctionBlock(isGenerator | isAsync);
             if (saveDecoratorContext) {
-                setDecoratorContext(true);
+                setDecoratorContext(/*val*/ true);
             }
             return finishNode(node);
         }
@@ -15157,10 +19190,10 @@ var ts;
         }
         function parseNewExpressionOrNewDotTarget() {
             var fullStart = scanner.getStartPos();
-            parseExpected(94);
-            if (parseOptional(23)) {
-                var node_2 = createNode(210, fullStart);
-                node_2.keywordToken = 94;
+            parseExpected(94 /* NewKeyword */);
+            if (parseOptional(23 /* DotToken */)) {
+                var node_2 = createNode(210 /* MetaProperty */, fullStart);
+                node_2.keywordToken = 94 /* NewKeyword */;
                 node_2.name = parseIdentifierName();
                 return finishNode(node_2);
             }
@@ -15176,22 +19209,23 @@ var ts;
                 }
                 break;
             }
-            var node = createNode(188, fullStart);
+            var node = createNode(188 /* NewExpression */, fullStart);
             node.expression = expression;
             node.typeArguments = typeArguments;
-            if (node.typeArguments || token() === 19) {
+            if (node.typeArguments || token() === 19 /* OpenParenToken */) {
                 node.arguments = parseArgumentList();
             }
             return finishNode(node);
         }
+        // STATEMENTS
         function parseBlock(ignoreMissingOpenBrace, diagnosticMessage) {
-            var node = createNode(213);
-            if (parseExpected(17, diagnosticMessage) || ignoreMissingOpenBrace) {
+            var node = createNode(213 /* Block */);
+            if (parseExpected(17 /* OpenBraceToken */, diagnosticMessage) || ignoreMissingOpenBrace) {
                 if (scanner.hasPrecedingLineBreak()) {
                     node.multiLine = true;
                 }
-                node.statements = parseList(1, parseStatement);
-                parseExpected(18);
+                node.statements = parseList(1 /* BlockStatements */, parseStatement);
+                parseExpected(18 /* CloseBraceToken */);
             }
             else {
                 node.statements = createMissingList();
@@ -15200,98 +19234,104 @@ var ts;
         }
         function parseFunctionBlock(flags, diagnosticMessage) {
             var savedYieldContext = inYieldContext();
-            setYieldContext(!!(flags & 1));
+            setYieldContext(!!(flags & 1 /* Yield */));
             var savedAwaitContext = inAwaitContext();
-            setAwaitContext(!!(flags & 2));
+            setAwaitContext(!!(flags & 2 /* Await */));
+            // We may be in a [Decorator] context when parsing a function expression or
+            // arrow function. The body of the function is not in [Decorator] context.
             var saveDecoratorContext = inDecoratorContext();
             if (saveDecoratorContext) {
-                setDecoratorContext(false);
+                setDecoratorContext(/*val*/ false);
             }
-            var block = parseBlock(!!(flags & 16), diagnosticMessage);
+            var block = parseBlock(!!(flags & 16 /* IgnoreMissingOpenBrace */), diagnosticMessage);
             if (saveDecoratorContext) {
-                setDecoratorContext(true);
+                setDecoratorContext(/*val*/ true);
             }
             setYieldContext(savedYieldContext);
             setAwaitContext(savedAwaitContext);
             return block;
         }
         function parseEmptyStatement() {
-            var node = createNode(215);
-            parseExpected(25);
+            var node = createNode(215 /* EmptyStatement */);
+            parseExpected(25 /* SemicolonToken */);
             return finishNode(node);
         }
         function parseIfStatement() {
-            var node = createNode(217);
-            parseExpected(90);
-            parseExpected(19);
+            var node = createNode(217 /* IfStatement */);
+            parseExpected(90 /* IfKeyword */);
+            parseExpected(19 /* OpenParenToken */);
             node.expression = allowInAnd(parseExpression);
-            parseExpected(20);
+            parseExpected(20 /* CloseParenToken */);
             node.thenStatement = parseStatement();
-            node.elseStatement = parseOptional(82) ? parseStatement() : undefined;
+            node.elseStatement = parseOptional(82 /* ElseKeyword */) ? parseStatement() : undefined;
             return finishNode(node);
         }
         function parseDoStatement() {
-            var node = createNode(218);
-            parseExpected(81);
+            var node = createNode(218 /* DoStatement */);
+            parseExpected(81 /* DoKeyword */);
             node.statement = parseStatement();
-            parseExpected(106);
-            parseExpected(19);
+            parseExpected(106 /* WhileKeyword */);
+            parseExpected(19 /* OpenParenToken */);
             node.expression = allowInAnd(parseExpression);
-            parseExpected(20);
-            parseOptional(25);
+            parseExpected(20 /* CloseParenToken */);
+            // From: https://mail.mozilla.org/pipermail/es-discuss/2011-August/016188.html
+            // 157 min --- All allen at wirfs-brock.com CONF --- "do{;}while(false)false" prohibited in
+            // spec but allowed in consensus reality. Approved -- this is the de-facto standard whereby
+            //  do;while(0)x will have a semicolon inserted before x.
+            parseOptional(25 /* SemicolonToken */);
             return finishNode(node);
         }
         function parseWhileStatement() {
-            var node = createNode(219);
-            parseExpected(106);
-            parseExpected(19);
+            var node = createNode(219 /* WhileStatement */);
+            parseExpected(106 /* WhileKeyword */);
+            parseExpected(19 /* OpenParenToken */);
             node.expression = allowInAnd(parseExpression);
-            parseExpected(20);
+            parseExpected(20 /* CloseParenToken */);
             node.statement = parseStatement();
             return finishNode(node);
         }
         function parseForOrForInOrForOfStatement() {
             var pos = getNodePos();
-            parseExpected(88);
-            var awaitToken = parseOptionalToken(121);
-            parseExpected(19);
+            parseExpected(88 /* ForKeyword */);
+            var awaitToken = parseOptionalToken(121 /* AwaitKeyword */);
+            parseExpected(19 /* OpenParenToken */);
             var initializer;
-            if (token() !== 25) {
-                if (token() === 104 || token() === 110 || token() === 76) {
-                    initializer = parseVariableDeclarationList(true);
+            if (token() !== 25 /* SemicolonToken */) {
+                if (token() === 104 /* VarKeyword */ || token() === 110 /* LetKeyword */ || token() === 76 /* ConstKeyword */) {
+                    initializer = parseVariableDeclarationList(/*inForStatementInitializer*/ true);
                 }
                 else {
                     initializer = disallowInAnd(parseExpression);
                 }
             }
             var forOrForInOrForOfStatement;
-            if (awaitToken ? parseExpected(145) : parseOptional(145)) {
-                var forOfStatement = createNode(222, pos);
+            if (awaitToken ? parseExpected(145 /* OfKeyword */) : parseOptional(145 /* OfKeyword */)) {
+                var forOfStatement = createNode(222 /* ForOfStatement */, pos);
                 forOfStatement.awaitModifier = awaitToken;
                 forOfStatement.initializer = initializer;
                 forOfStatement.expression = allowInAnd(parseAssignmentExpressionOrHigher);
-                parseExpected(20);
+                parseExpected(20 /* CloseParenToken */);
                 forOrForInOrForOfStatement = forOfStatement;
             }
-            else if (parseOptional(92)) {
-                var forInStatement = createNode(221, pos);
+            else if (parseOptional(92 /* InKeyword */)) {
+                var forInStatement = createNode(221 /* ForInStatement */, pos);
                 forInStatement.initializer = initializer;
                 forInStatement.expression = allowInAnd(parseExpression);
-                parseExpected(20);
+                parseExpected(20 /* CloseParenToken */);
                 forOrForInOrForOfStatement = forInStatement;
             }
             else {
-                var forStatement = createNode(220, pos);
+                var forStatement = createNode(220 /* ForStatement */, pos);
                 forStatement.initializer = initializer;
-                parseExpected(25);
-                if (token() !== 25 && token() !== 20) {
+                parseExpected(25 /* SemicolonToken */);
+                if (token() !== 25 /* SemicolonToken */ && token() !== 20 /* CloseParenToken */) {
                     forStatement.condition = allowInAnd(parseExpression);
                 }
-                parseExpected(25);
-                if (token() !== 20) {
+                parseExpected(25 /* SemicolonToken */);
+                if (token() !== 20 /* CloseParenToken */) {
                     forStatement.incrementor = allowInAnd(parseExpression);
                 }
-                parseExpected(20);
+                parseExpected(20 /* CloseParenToken */);
                 forOrForInOrForOfStatement = forStatement;
             }
             forOrForInOrForOfStatement.statement = parseStatement();
@@ -15299,7 +19339,7 @@ var ts;
         }
         function parseBreakOrContinueStatement(kind) {
             var node = createNode(kind);
-            parseExpected(kind === 224 ? 72 : 77);
+            parseExpected(kind === 224 /* BreakStatement */ ? 72 /* BreakKeyword */ : 77 /* ContinueKeyword */);
             if (!canParseSemicolon()) {
                 node.label = parseIdentifier();
             }
@@ -15307,8 +19347,8 @@ var ts;
             return finishNode(node);
         }
         function parseReturnStatement() {
-            var node = createNode(225);
-            parseExpected(96);
+            var node = createNode(225 /* ReturnStatement */);
+            parseExpected(96 /* ReturnKeyword */);
             if (!canParseSemicolon()) {
                 node.expression = allowInAnd(parseExpression);
             }
@@ -15316,92 +19356,106 @@ var ts;
             return finishNode(node);
         }
         function parseWithStatement() {
-            var node = createNode(226);
-            parseExpected(107);
-            parseExpected(19);
+            var node = createNode(226 /* WithStatement */);
+            parseExpected(107 /* WithKeyword */);
+            parseExpected(19 /* OpenParenToken */);
             node.expression = allowInAnd(parseExpression);
-            parseExpected(20);
-            node.statement = doInsideOfContext(8388608, parseStatement);
+            parseExpected(20 /* CloseParenToken */);
+            node.statement = doInsideOfContext(8388608 /* InWithStatement */, parseStatement);
             return finishNode(node);
         }
         function parseCaseClause() {
-            var node = createNode(266);
-            parseExpected(73);
+            var node = createNode(266 /* CaseClause */);
+            parseExpected(73 /* CaseKeyword */);
             node.expression = allowInAnd(parseExpression);
-            parseExpected(56);
-            node.statements = parseList(3, parseStatement);
+            parseExpected(56 /* ColonToken */);
+            node.statements = parseList(3 /* SwitchClauseStatements */, parseStatement);
             return finishNode(node);
         }
         function parseDefaultClause() {
-            var node = createNode(267);
-            parseExpected(79);
-            parseExpected(56);
-            node.statements = parseList(3, parseStatement);
+            var node = createNode(267 /* DefaultClause */);
+            parseExpected(79 /* DefaultKeyword */);
+            parseExpected(56 /* ColonToken */);
+            node.statements = parseList(3 /* SwitchClauseStatements */, parseStatement);
             return finishNode(node);
         }
         function parseCaseOrDefaultClause() {
-            return token() === 73 ? parseCaseClause() : parseDefaultClause();
+            return token() === 73 /* CaseKeyword */ ? parseCaseClause() : parseDefaultClause();
         }
         function parseSwitchStatement() {
-            var node = createNode(227);
-            parseExpected(98);
-            parseExpected(19);
+            var node = createNode(227 /* SwitchStatement */);
+            parseExpected(98 /* SwitchKeyword */);
+            parseExpected(19 /* OpenParenToken */);
             node.expression = allowInAnd(parseExpression);
-            parseExpected(20);
-            var caseBlock = createNode(241);
-            parseExpected(17);
-            caseBlock.clauses = parseList(2, parseCaseOrDefaultClause);
-            parseExpected(18);
+            parseExpected(20 /* CloseParenToken */);
+            var caseBlock = createNode(241 /* CaseBlock */);
+            parseExpected(17 /* OpenBraceToken */);
+            caseBlock.clauses = parseList(2 /* SwitchClauses */, parseCaseOrDefaultClause);
+            parseExpected(18 /* CloseBraceToken */);
             node.caseBlock = finishNode(caseBlock);
             return finishNode(node);
         }
         function parseThrowStatement() {
-            var node = createNode(229);
-            parseExpected(100);
+            // ThrowStatement[Yield] :
+            //      throw [no LineTerminator here]Expression[In, ?Yield];
+            // Because of automatic semicolon insertion, we need to report error if this
+            // throw could be terminated with a semicolon.  Note: we can't call 'parseExpression'
+            // directly as that might consume an expression on the following line.
+            // We just return 'undefined' in that case.  The actual error will be reported in the
+            // grammar walker.
+            var node = createNode(229 /* ThrowStatement */);
+            parseExpected(100 /* ThrowKeyword */);
             node.expression = scanner.hasPrecedingLineBreak() ? undefined : allowInAnd(parseExpression);
             parseSemicolon();
             return finishNode(node);
         }
+        // TODO: Review for error recovery
         function parseTryStatement() {
-            var node = createNode(230);
-            parseExpected(102);
-            node.tryBlock = parseBlock(false);
-            node.catchClause = token() === 74 ? parseCatchClause() : undefined;
-            if (!node.catchClause || token() === 87) {
-                parseExpected(87);
-                node.finallyBlock = parseBlock(false);
+            var node = createNode(230 /* TryStatement */);
+            parseExpected(102 /* TryKeyword */);
+            node.tryBlock = parseBlock(/*ignoreMissingOpenBrace*/ false);
+            node.catchClause = token() === 74 /* CatchKeyword */ ? parseCatchClause() : undefined;
+            // If we don't have a catch clause, then we must have a finally clause.  Try to parse
+            // one out no matter what.
+            if (!node.catchClause || token() === 87 /* FinallyKeyword */) {
+                parseExpected(87 /* FinallyKeyword */);
+                node.finallyBlock = parseBlock(/*ignoreMissingOpenBrace*/ false);
             }
             return finishNode(node);
         }
         function parseCatchClause() {
-            var result = createNode(269);
-            parseExpected(74);
-            if (parseOptional(19)) {
+            var result = createNode(269 /* CatchClause */);
+            parseExpected(74 /* CatchKeyword */);
+            if (parseOptional(19 /* OpenParenToken */)) {
                 result.variableDeclaration = parseVariableDeclaration();
-                parseExpected(20);
+                parseExpected(20 /* CloseParenToken */);
             }
             else {
+                // Keep shape of node to avoid degrading performance.
                 result.variableDeclaration = undefined;
             }
-            result.block = parseBlock(false);
+            result.block = parseBlock(/*ignoreMissingOpenBrace*/ false);
             return finishNode(result);
         }
         function parseDebuggerStatement() {
-            var node = createNode(231);
-            parseExpected(78);
+            var node = createNode(231 /* DebuggerStatement */);
+            parseExpected(78 /* DebuggerKeyword */);
             parseSemicolon();
             return finishNode(node);
         }
         function parseExpressionOrLabeledStatement() {
-            var node = createNodeWithJSDoc(0);
+            // Avoiding having to do the lookahead for a labeled statement by just trying to parse
+            // out an expression, seeing if it is identifier and then seeing if it is followed by
+            // a colon.
+            var node = createNodeWithJSDoc(0 /* Unknown */);
             var expression = allowInAnd(parseExpression);
-            if (expression.kind === 71 && parseOptional(56)) {
-                node.kind = 228;
+            if (expression.kind === 71 /* Identifier */ && parseOptional(56 /* ColonToken */)) {
+                node.kind = 228 /* LabeledStatement */;
                 node.label = expression;
                 node.statement = parseStatement();
             }
             else {
-                node.kind = 216;
+                node.kind = 216 /* ExpressionStatement */;
                 node.expression = expression;
                 parseSemicolon();
             }
@@ -15413,60 +19467,82 @@ var ts;
         }
         function nextTokenIsClassKeywordOnSameLine() {
             nextToken();
-            return token() === 75 && !scanner.hasPrecedingLineBreak();
+            return token() === 75 /* ClassKeyword */ && !scanner.hasPrecedingLineBreak();
         }
         function nextTokenIsFunctionKeywordOnSameLine() {
             nextToken();
-            return token() === 89 && !scanner.hasPrecedingLineBreak();
+            return token() === 89 /* FunctionKeyword */ && !scanner.hasPrecedingLineBreak();
         }
         function nextTokenIsIdentifierOrKeywordOrLiteralOnSameLine() {
             nextToken();
-            return (ts.tokenIsIdentifierOrKeyword(token()) || token() === 8 || token() === 9) && !scanner.hasPrecedingLineBreak();
+            return (ts.tokenIsIdentifierOrKeyword(token()) || token() === 8 /* NumericLiteral */ || token() === 9 /* StringLiteral */) && !scanner.hasPrecedingLineBreak();
         }
         function isDeclaration() {
             while (true) {
                 switch (token()) {
-                    case 104:
-                    case 110:
-                    case 76:
-                    case 89:
-                    case 75:
-                    case 83:
+                    case 104 /* VarKeyword */:
+                    case 110 /* LetKeyword */:
+                    case 76 /* ConstKeyword */:
+                    case 89 /* FunctionKeyword */:
+                    case 75 /* ClassKeyword */:
+                    case 83 /* EnumKeyword */:
                         return true;
-                    case 109:
-                    case 139:
+                    // 'declare', 'module', 'namespace', 'interface'* and 'type' are all legal JavaScript identifiers;
+                    // however, an identifier cannot be followed by another identifier on the same line. This is what we
+                    // count on to parse out the respective declarations. For instance, we exploit this to say that
+                    //
+                    //    namespace n
+                    //
+                    // can be none other than the beginning of a namespace declaration, but need to respect that JavaScript sees
+                    //
+                    //    namespace
+                    //    n
+                    //
+                    // as the identifier 'namespace' on one line followed by the identifier 'n' on another.
+                    // We need to look one token ahead to see if it permissible to try parsing a declaration.
+                    //
+                    // *Note*: 'interface' is actually a strict mode reserved word. So while
+                    //
+                    //   "use strict"
+                    //   interface
+                    //   I {}
+                    //
+                    // could be legal, it would add complexity for very little gain.
+                    case 109 /* InterfaceKeyword */:
+                    case 139 /* TypeKeyword */:
                         return nextTokenIsIdentifierOnSameLine();
-                    case 129:
-                    case 130:
+                    case 129 /* ModuleKeyword */:
+                    case 130 /* NamespaceKeyword */:
                         return nextTokenIsIdentifierOrStringLiteralOnSameLine();
-                    case 117:
-                    case 120:
-                    case 124:
-                    case 112:
-                    case 113:
-                    case 114:
-                    case 132:
+                    case 117 /* AbstractKeyword */:
+                    case 120 /* AsyncKeyword */:
+                    case 124 /* DeclareKeyword */:
+                    case 112 /* PrivateKeyword */:
+                    case 113 /* ProtectedKeyword */:
+                    case 114 /* PublicKeyword */:
+                    case 132 /* ReadonlyKeyword */:
                         nextToken();
+                        // ASI takes effect for this modifier.
                         if (scanner.hasPrecedingLineBreak()) {
                             return false;
                         }
                         continue;
-                    case 144:
+                    case 144 /* GlobalKeyword */:
                         nextToken();
-                        return token() === 17 || token() === 71 || token() === 84;
-                    case 91:
+                        return token() === 17 /* OpenBraceToken */ || token() === 71 /* Identifier */ || token() === 84 /* ExportKeyword */;
+                    case 91 /* ImportKeyword */:
                         nextToken();
-                        return token() === 9 || token() === 39 ||
-                            token() === 17 || ts.tokenIsIdentifierOrKeyword(token());
-                    case 84:
+                        return token() === 9 /* StringLiteral */ || token() === 39 /* AsteriskToken */ ||
+                            token() === 17 /* OpenBraceToken */ || ts.tokenIsIdentifierOrKeyword(token());
+                    case 84 /* ExportKeyword */:
                         nextToken();
-                        if (token() === 58 || token() === 39 ||
-                            token() === 17 || token() === 79 ||
-                            token() === 118) {
+                        if (token() === 58 /* EqualsToken */ || token() === 39 /* AsteriskToken */ ||
+                            token() === 17 /* OpenBraceToken */ || token() === 79 /* DefaultKeyword */ ||
+                            token() === 118 /* AsKeyword */) {
                             return true;
                         }
                         continue;
-                    case 115:
+                    case 115 /* StaticKeyword */:
                         nextToken();
                         continue;
                     default:
@@ -15479,47 +19555,52 @@ var ts;
         }
         function isStartOfStatement() {
             switch (token()) {
-                case 57:
-                case 25:
-                case 17:
-                case 104:
-                case 110:
-                case 89:
-                case 75:
-                case 83:
-                case 90:
-                case 81:
-                case 106:
-                case 88:
-                case 77:
-                case 72:
-                case 96:
-                case 107:
-                case 98:
-                case 100:
-                case 102:
-                case 78:
-                case 74:
-                case 87:
+                case 57 /* AtToken */:
+                case 25 /* SemicolonToken */:
+                case 17 /* OpenBraceToken */:
+                case 104 /* VarKeyword */:
+                case 110 /* LetKeyword */:
+                case 89 /* FunctionKeyword */:
+                case 75 /* ClassKeyword */:
+                case 83 /* EnumKeyword */:
+                case 90 /* IfKeyword */:
+                case 81 /* DoKeyword */:
+                case 106 /* WhileKeyword */:
+                case 88 /* ForKeyword */:
+                case 77 /* ContinueKeyword */:
+                case 72 /* BreakKeyword */:
+                case 96 /* ReturnKeyword */:
+                case 107 /* WithKeyword */:
+                case 98 /* SwitchKeyword */:
+                case 100 /* ThrowKeyword */:
+                case 102 /* TryKeyword */:
+                case 78 /* DebuggerKeyword */:
+                // 'catch' and 'finally' do not actually indicate that the code is part of a statement,
+                // however, we say they are here so that we may gracefully parse them and error later.
+                case 74 /* CatchKeyword */:
+                case 87 /* FinallyKeyword */:
                     return true;
-                case 91:
+                case 91 /* ImportKeyword */:
                     return isStartOfDeclaration() || lookAhead(nextTokenIsOpenParenOrLessThanOrDot);
-                case 76:
-                case 84:
+                case 76 /* ConstKeyword */:
+                case 84 /* ExportKeyword */:
                     return isStartOfDeclaration();
-                case 120:
-                case 124:
-                case 109:
-                case 129:
-                case 130:
-                case 139:
-                case 144:
+                case 120 /* AsyncKeyword */:
+                case 124 /* DeclareKeyword */:
+                case 109 /* InterfaceKeyword */:
+                case 129 /* ModuleKeyword */:
+                case 130 /* NamespaceKeyword */:
+                case 139 /* TypeKeyword */:
+                case 144 /* GlobalKeyword */:
+                    // When these don't start a declaration, they're an identifier in an expression statement
                     return true;
-                case 114:
-                case 112:
-                case 113:
-                case 115:
-                case 132:
+                case 114 /* PublicKeyword */:
+                case 112 /* PrivateKeyword */:
+                case 113 /* ProtectedKeyword */:
+                case 115 /* StaticKeyword */:
+                case 132 /* ReadonlyKeyword */:
+                    // When these don't start a declaration, they may be the start of a class member if an identifier
+                    // immediately follows. Otherwise they're an identifier in an expression statement.
                     return isStartOfDeclaration() || !lookAhead(nextTokenIsIdentifierOrKeywordOnSameLine);
                 default:
                     return isStartOfExpression();
@@ -15527,73 +19608,76 @@ var ts;
         }
         function nextTokenIsIdentifierOrStartOfDestructuring() {
             nextToken();
-            return isIdentifier() || token() === 17 || token() === 21;
+            return isIdentifier() || token() === 17 /* OpenBraceToken */ || token() === 21 /* OpenBracketToken */;
         }
         function isLetDeclaration() {
+            // In ES6 'let' always starts a lexical declaration if followed by an identifier or {
+            // or [.
             return lookAhead(nextTokenIsIdentifierOrStartOfDestructuring);
         }
         function parseStatement() {
             switch (token()) {
-                case 25:
+                case 25 /* SemicolonToken */:
                     return parseEmptyStatement();
-                case 17:
-                    return parseBlock(false);
-                case 104:
-                    return parseVariableStatement(createNodeWithJSDoc(232));
-                case 110:
+                case 17 /* OpenBraceToken */:
+                    return parseBlock(/*ignoreMissingOpenBrace*/ false);
+                case 104 /* VarKeyword */:
+                    return parseVariableStatement(createNodeWithJSDoc(232 /* VariableDeclaration */));
+                case 110 /* LetKeyword */:
                     if (isLetDeclaration()) {
-                        return parseVariableStatement(createNodeWithJSDoc(232));
+                        return parseVariableStatement(createNodeWithJSDoc(232 /* VariableDeclaration */));
                     }
                     break;
-                case 89:
-                    return parseFunctionDeclaration(createNodeWithJSDoc(234));
-                case 75:
-                    return parseClassDeclaration(createNodeWithJSDoc(235));
-                case 90:
+                case 89 /* FunctionKeyword */:
+                    return parseFunctionDeclaration(createNodeWithJSDoc(234 /* FunctionDeclaration */));
+                case 75 /* ClassKeyword */:
+                    return parseClassDeclaration(createNodeWithJSDoc(235 /* ClassDeclaration */));
+                case 90 /* IfKeyword */:
                     return parseIfStatement();
-                case 81:
+                case 81 /* DoKeyword */:
                     return parseDoStatement();
-                case 106:
+                case 106 /* WhileKeyword */:
                     return parseWhileStatement();
-                case 88:
+                case 88 /* ForKeyword */:
                     return parseForOrForInOrForOfStatement();
-                case 77:
-                    return parseBreakOrContinueStatement(223);
-                case 72:
-                    return parseBreakOrContinueStatement(224);
-                case 96:
+                case 77 /* ContinueKeyword */:
+                    return parseBreakOrContinueStatement(223 /* ContinueStatement */);
+                case 72 /* BreakKeyword */:
+                    return parseBreakOrContinueStatement(224 /* BreakStatement */);
+                case 96 /* ReturnKeyword */:
                     return parseReturnStatement();
-                case 107:
+                case 107 /* WithKeyword */:
                     return parseWithStatement();
-                case 98:
+                case 98 /* SwitchKeyword */:
                     return parseSwitchStatement();
-                case 100:
+                case 100 /* ThrowKeyword */:
                     return parseThrowStatement();
-                case 102:
-                case 74:
-                case 87:
+                case 102 /* TryKeyword */:
+                // Include 'catch' and 'finally' for error recovery.
+                case 74 /* CatchKeyword */:
+                case 87 /* FinallyKeyword */:
                     return parseTryStatement();
-                case 78:
+                case 78 /* DebuggerKeyword */:
                     return parseDebuggerStatement();
-                case 57:
+                case 57 /* AtToken */:
                     return parseDeclaration();
-                case 120:
-                case 109:
-                case 139:
-                case 129:
-                case 130:
-                case 124:
-                case 76:
-                case 83:
-                case 84:
-                case 91:
-                case 112:
-                case 113:
-                case 114:
-                case 117:
-                case 115:
-                case 132:
-                case 144:
+                case 120 /* AsyncKeyword */:
+                case 109 /* InterfaceKeyword */:
+                case 139 /* TypeKeyword */:
+                case 129 /* ModuleKeyword */:
+                case 130 /* NamespaceKeyword */:
+                case 124 /* DeclareKeyword */:
+                case 76 /* ConstKeyword */:
+                case 83 /* EnumKeyword */:
+                case 84 /* ExportKeyword */:
+                case 91 /* ImportKeyword */:
+                case 112 /* PrivateKeyword */:
+                case 113 /* ProtectedKeyword */:
+                case 114 /* PublicKeyword */:
+                case 117 /* AbstractKeyword */:
+                case 115 /* StaticKeyword */:
+                case 132 /* ReadonlyKeyword */:
+                case 144 /* GlobalKeyword */:
                     if (isStartOfDeclaration()) {
                         return parseDeclaration();
                     }
@@ -15602,18 +19686,18 @@ var ts;
             return parseExpressionOrLabeledStatement();
         }
         function isDeclareModifier(modifier) {
-            return modifier.kind === 124;
+            return modifier.kind === 124 /* DeclareKeyword */;
         }
         function parseDeclaration() {
-            var node = createNodeWithJSDoc(0);
+            var node = createNodeWithJSDoc(0 /* Unknown */);
             node.decorators = parseDecorators();
             node.modifiers = parseModifiers();
             if (ts.some(node.modifiers, isDeclareModifier)) {
                 for (var _i = 0, _a = node.modifiers; _i < _a.length; _i++) {
                     var m = _a[_i];
-                    m.flags |= 4194304;
+                    m.flags |= 4194304 /* Ambient */;
                 }
-                return doInsideOfContext(4194304, function () { return parseDeclarationWorker(node); });
+                return doInsideOfContext(4194304 /* Ambient */, function () { return parseDeclarationWorker(node); });
             }
             else {
                 return parseDeclarationWorker(node);
@@ -15621,79 +19705,82 @@ var ts;
         }
         function parseDeclarationWorker(node) {
             switch (token()) {
-                case 104:
-                case 110:
-                case 76:
+                case 104 /* VarKeyword */:
+                case 110 /* LetKeyword */:
+                case 76 /* ConstKeyword */:
                     return parseVariableStatement(node);
-                case 89:
+                case 89 /* FunctionKeyword */:
                     return parseFunctionDeclaration(node);
-                case 75:
+                case 75 /* ClassKeyword */:
                     return parseClassDeclaration(node);
-                case 109:
+                case 109 /* InterfaceKeyword */:
                     return parseInterfaceDeclaration(node);
-                case 139:
+                case 139 /* TypeKeyword */:
                     return parseTypeAliasDeclaration(node);
-                case 83:
+                case 83 /* EnumKeyword */:
                     return parseEnumDeclaration(node);
-                case 144:
-                case 129:
-                case 130:
+                case 144 /* GlobalKeyword */:
+                case 129 /* ModuleKeyword */:
+                case 130 /* NamespaceKeyword */:
                     return parseModuleDeclaration(node);
-                case 91:
+                case 91 /* ImportKeyword */:
                     return parseImportDeclarationOrImportEqualsDeclaration(node);
-                case 84:
+                case 84 /* ExportKeyword */:
                     nextToken();
                     switch (token()) {
-                        case 79:
-                        case 58:
+                        case 79 /* DefaultKeyword */:
+                        case 58 /* EqualsToken */:
                             return parseExportAssignment(node);
-                        case 118:
+                        case 118 /* AsKeyword */:
                             return parseNamespaceExportDeclaration(node);
                         default:
                             return parseExportDeclaration(node);
                     }
                 default:
                     if (node.decorators || node.modifiers) {
-                        var missing = createMissingNode(253, true, ts.Diagnostics.Declaration_expected);
+                        // We reached this point because we encountered decorators and/or modifiers and assumed a declaration
+                        // would follow. For recovery and error reporting purposes, return an incomplete declaration.
+                        var missing = createMissingNode(253 /* MissingDeclaration */, /*reportAtCurrentPosition*/ true, ts.Diagnostics.Declaration_expected);
                         missing.pos = node.pos;
                         missing.decorators = node.decorators;
                         missing.modifiers = node.modifiers;
                         return finishNode(missing);
                     }
-                    return undefined;
+                    return undefined; // TODO: GH#18217
             }
         }
         function nextTokenIsIdentifierOrStringLiteralOnSameLine() {
             nextToken();
-            return !scanner.hasPrecedingLineBreak() && (isIdentifier() || token() === 9);
+            return !scanner.hasPrecedingLineBreak() && (isIdentifier() || token() === 9 /* StringLiteral */);
         }
         function parseFunctionBlockOrSemicolon(flags, diagnosticMessage) {
-            if (token() !== 17 && canParseSemicolon()) {
+            if (token() !== 17 /* OpenBraceToken */ && canParseSemicolon()) {
                 parseSemicolon();
                 return;
             }
             return parseFunctionBlock(flags, diagnosticMessage);
         }
+        // DECLARATIONS
         function parseArrayBindingElement() {
-            if (token() === 26) {
-                return createNode(206);
+            if (token() === 26 /* CommaToken */) {
+                return createNode(206 /* OmittedExpression */);
             }
-            var node = createNode(182);
-            node.dotDotDotToken = parseOptionalToken(24);
+            var node = createNode(182 /* BindingElement */);
+            node.dotDotDotToken = parseOptionalToken(24 /* DotDotDotToken */);
             node.name = parseIdentifierOrPattern();
             node.initializer = parseInitializer();
             return finishNode(node);
         }
         function parseObjectBindingElement() {
-            var node = createNode(182);
-            node.dotDotDotToken = parseOptionalToken(24);
+            var node = createNode(182 /* BindingElement */);
+            node.dotDotDotToken = parseOptionalToken(24 /* DotDotDotToken */);
             var tokenIsIdentifier = isIdentifier();
             var propertyName = parsePropertyName();
-            if (tokenIsIdentifier && token() !== 56) {
+            if (tokenIsIdentifier && token() !== 56 /* ColonToken */) {
                 node.name = propertyName;
             }
             else {
-                parseExpected(56);
+                parseExpected(56 /* ColonToken */);
                 node.propertyName = propertyName;
                 node.name = parseIdentifierOrPattern();
             }
@@ -15701,39 +19788,39 @@ var ts;
             return finishNode(node);
         }
         function parseObjectBindingPattern() {
-            var node = createNode(180);
-            parseExpected(17);
-            node.elements = parseDelimitedList(9, parseObjectBindingElement);
-            parseExpected(18);
+            var node = createNode(180 /* ObjectBindingPattern */);
+            parseExpected(17 /* OpenBraceToken */);
+            node.elements = parseDelimitedList(9 /* ObjectBindingElements */, parseObjectBindingElement);
+            parseExpected(18 /* CloseBraceToken */);
             return finishNode(node);
         }
         function parseArrayBindingPattern() {
-            var node = createNode(181);
-            parseExpected(21);
-            node.elements = parseDelimitedList(10, parseArrayBindingElement);
-            parseExpected(22);
+            var node = createNode(181 /* ArrayBindingPattern */);
+            parseExpected(21 /* OpenBracketToken */);
+            node.elements = parseDelimitedList(10 /* ArrayBindingElements */, parseArrayBindingElement);
+            parseExpected(22 /* CloseBracketToken */);
             return finishNode(node);
         }
         function isIdentifierOrPattern() {
-            return token() === 17 || token() === 21 || isIdentifier();
+            return token() === 17 /* OpenBraceToken */ || token() === 21 /* OpenBracketToken */ || isIdentifier();
         }
         function parseIdentifierOrPattern() {
-            if (token() === 21) {
+            if (token() === 21 /* OpenBracketToken */) {
                 return parseArrayBindingPattern();
             }
-            if (token() === 17) {
+            if (token() === 17 /* OpenBraceToken */) {
                 return parseObjectBindingPattern();
             }
             return parseIdentifier();
         }
         function parseVariableDeclarationAllowExclamation() {
-            return parseVariableDeclaration(true);
+            return parseVariableDeclaration(/*allowExclamation*/ true);
         }
         function parseVariableDeclaration(allowExclamation) {
-            var node = createNode(232);
+            var node = createNode(232 /* VariableDeclaration */);
             node.name = parseIdentifierOrPattern();
-            if (allowExclamation && node.name.kind === 71 &&
-                token() === 51 && !scanner.hasPrecedingLineBreak()) {
+            if (allowExclamation && node.name.kind === 71 /* Identifier */ &&
+                token() === 51 /* ExclamationToken */ && !scanner.hasPrecedingLineBreak()) {
                 node.exclamationToken = parseTokenNode();
             }
             node.type = parseTypeAnnotation();
@@ -15743,84 +19830,104 @@ var ts;
             return finishNode(node);
         }
         function parseVariableDeclarationList(inForStatementInitializer) {
-            var node = createNode(233);
+            var node = createNode(233 /* VariableDeclarationList */);
             switch (token()) {
-                case 104:
+                case 104 /* VarKeyword */:
                     break;
-                case 110:
-                    node.flags |= 1;
+                case 110 /* LetKeyword */:
+                    node.flags |= 1 /* Let */;
                     break;
-                case 76:
-                    node.flags |= 2;
+                case 76 /* ConstKeyword */:
+                    node.flags |= 2 /* Const */;
                     break;
                 default:
                     ts.Debug.fail();
             }
             nextToken();
-            if (token() === 145 && lookAhead(canFollowContextualOfKeyword)) {
+            // The user may have written the following:
+            //
+            //    for (let of X) { }
+            //
+            // In this case, we want to parse an empty declaration list, and then parse 'of'
+            // as a keyword. The reason this is not automatic is that 'of' is a valid identifier.
+            // So we need to look ahead to determine if 'of' should be treated as a keyword in
+            // this context.
+            // The checker will then give an error that there is an empty declaration list.
+            if (token() === 145 /* OfKeyword */ && lookAhead(canFollowContextualOfKeyword)) {
                 node.declarations = createMissingList();
             }
             else {
                 var savedDisallowIn = inDisallowInContext();
                 setDisallowInContext(inForStatementInitializer);
-                node.declarations = parseDelimitedList(8, inForStatementInitializer ? parseVariableDeclaration : parseVariableDeclarationAllowExclamation);
+                node.declarations = parseDelimitedList(8 /* VariableDeclarations */, inForStatementInitializer ? parseVariableDeclaration : parseVariableDeclarationAllowExclamation);
                 setDisallowInContext(savedDisallowIn);
             }
             return finishNode(node);
         }
         function canFollowContextualOfKeyword() {
-            return nextTokenIsIdentifier() && nextToken() === 20;
+            return nextTokenIsIdentifier() && nextToken() === 20 /* CloseParenToken */;
         }
         function parseVariableStatement(node) {
-            node.kind = 214;
-            node.declarationList = parseVariableDeclarationList(false);
+            node.kind = 214 /* VariableStatement */;
+            node.declarationList = parseVariableDeclarationList(/*inForStatementInitializer*/ false);
             parseSemicolon();
             return finishNode(node);
         }
         function parseFunctionDeclaration(node) {
-            node.kind = 234;
-            parseExpected(89);
-            node.asteriskToken = parseOptionalToken(39);
-            node.name = ts.hasModifier(node, 512) ? parseOptionalIdentifier() : parseIdentifier();
-            var isGenerator = node.asteriskToken ? 1 : 0;
-            var isAsync = ts.hasModifier(node, 256) ? 2 : 0;
-            fillSignature(56, isGenerator | isAsync, node);
+            node.kind = 234 /* FunctionDeclaration */;
+            parseExpected(89 /* FunctionKeyword */);
+            node.asteriskToken = parseOptionalToken(39 /* AsteriskToken */);
+            node.name = ts.hasModifier(node, 512 /* Default */) ? parseOptionalIdentifier() : parseIdentifier();
+            var isGenerator = node.asteriskToken ? 1 /* Yield */ : 0 /* None */;
+            var isAsync = ts.hasModifier(node, 256 /* Async */) ? 2 /* Await */ : 0 /* None */;
+            fillSignature(56 /* ColonToken */, isGenerator | isAsync, node);
             node.body = parseFunctionBlockOrSemicolon(isGenerator | isAsync, ts.Diagnostics.or_expected);
             return finishNode(node);
         }
         function parseConstructorDeclaration(node) {
-            node.kind = 155;
-            parseExpected(123);
-            fillSignature(56, 0, node);
-            node.body = parseFunctionBlockOrSemicolon(0, ts.Diagnostics.or_expected);
+            node.kind = 155 /* Constructor */;
+            parseExpected(123 /* ConstructorKeyword */);
+            fillSignature(56 /* ColonToken */, 0 /* None */, node);
+            node.body = parseFunctionBlockOrSemicolon(0 /* None */, ts.Diagnostics.or_expected);
             return finishNode(node);
         }
         function parseMethodDeclaration(node, asteriskToken, diagnosticMessage) {
-            node.kind = 154;
+            node.kind = 154 /* MethodDeclaration */;
             node.asteriskToken = asteriskToken;
-            var isGenerator = asteriskToken ? 1 : 0;
-            var isAsync = ts.hasModifier(node, 256) ? 2 : 0;
-            fillSignature(56, isGenerator | isAsync, node);
+            var isGenerator = asteriskToken ? 1 /* Yield */ : 0 /* None */;
+            var isAsync = ts.hasModifier(node, 256 /* Async */) ? 2 /* Await */ : 0 /* None */;
+            fillSignature(56 /* ColonToken */, isGenerator | isAsync, node);
             node.body = parseFunctionBlockOrSemicolon(isGenerator | isAsync, diagnosticMessage);
             return finishNode(node);
         }
         function parsePropertyDeclaration(node) {
-            node.kind = 152;
-            if (!node.questionToken && token() === 51 && !scanner.hasPrecedingLineBreak()) {
+            node.kind = 152 /* PropertyDeclaration */;
+            if (!node.questionToken && token() === 51 /* ExclamationToken */ && !scanner.hasPrecedingLineBreak()) {
                 node.exclamationToken = parseTokenNode();
             }
             node.type = parseTypeAnnotation();
-            node.initializer = ts.hasModifier(node, 32)
+            // For instance properties specifically, since they are evaluated inside the constructor,
+            // we do *not * want to parse yield expressions, so we specifically turn the yield context
+            // off. The grammar would look something like this:
+            //
+            //    MemberVariableDeclaration[Yield]:
+            //        AccessibilityModifier_opt PropertyName TypeAnnotation_opt Initializer_opt[In];
+            //        AccessibilityModifier_opt static_opt PropertyName TypeAnnotation_opt Initializer_opt[In, ?Yield];
+            //
+            // The checker may still error in the static case to explicitly disallow the yield expression.
+            node.initializer = ts.hasModifier(node, 32 /* Static */)
                 ? allowInAnd(parseInitializer)
-                : doOutsideOfContext(4096 | 2048, parseInitializer);
+                : doOutsideOfContext(4096 /* YieldContext */ | 2048 /* DisallowInContext */, parseInitializer);
             parseSemicolon();
             return finishNode(node);
         }
         function parsePropertyOrMethodDeclaration(node) {
-            var asteriskToken = parseOptionalToken(39);
+            var asteriskToken = parseOptionalToken(39 /* AsteriskToken */);
             node.name = parsePropertyName();
-            node.questionToken = parseOptionalToken(55);
-            if (asteriskToken || token() === 19 || token() === 27) {
+            // Note: this is not legal as per the grammar.  But we allow it in the parser and
+            // report an error in the grammar checker.
+            node.questionToken = parseOptionalToken(55 /* QuestionToken */);
+            if (asteriskToken || token() === 19 /* OpenParenToken */ || token() === 27 /* LessThanToken */) {
                 return parseMethodDeclaration(node, asteriskToken, ts.Diagnostics.or_expected);
             }
             return parsePropertyDeclaration(node);
@@ -15828,45 +19935,64 @@ var ts;
         function parseAccessorDeclaration(node, kind) {
             node.kind = kind;
             node.name = parsePropertyName();
-            fillSignature(56, 0, node);
-            node.body = parseFunctionBlockOrSemicolon(0);
+            fillSignature(56 /* ColonToken */, 0 /* None */, node);
+            node.body = parseFunctionBlockOrSemicolon(0 /* None */);
             return finishNode(node);
         }
         function isClassMemberStart() {
             var idToken;
-            if (token() === 57) {
+            if (token() === 57 /* AtToken */) {
                 return true;
             }
+            // Eat up all modifiers, but hold on to the last one in case it is actually an identifier.
             while (ts.isModifierKind(token())) {
                 idToken = token();
+                // If the idToken is a class modifier (protected, private, public, and static), it is
+                // certain that we are starting to parse class member. This allows better error recovery
+                // Example:
+                //      public foo() ...     // true
+                //      public @dec blah ... // true; we will then report an error later
+                //      export public ...    // true; we will then report an error later
                 if (ts.isClassMemberModifier(idToken)) {
                     return true;
                 }
                 nextToken();
             }
-            if (token() === 39) {
+            if (token() === 39 /* AsteriskToken */) {
                 return true;
             }
+            // Try to get the first property-like token following all modifiers.
+            // This can either be an identifier or the 'get' or 'set' keywords.
             if (isLiteralPropertyName()) {
                 idToken = token();
                 nextToken();
             }
-            if (token() === 21) {
+            // Index signatures and computed properties are class members; we can parse.
+            if (token() === 21 /* OpenBracketToken */) {
                 return true;
             }
+            // If we were able to get any potential identifier...
             if (idToken !== undefined) {
-                if (!ts.isKeyword(idToken) || idToken === 136 || idToken === 125) {
+                // If we have a non-keyword identifier, or if we have an accessor, then it's safe to parse.
+                if (!ts.isKeyword(idToken) || idToken === 136 /* SetKeyword */ || idToken === 125 /* GetKeyword */) {
                     return true;
                 }
+                // If it *is* a keyword, but not an accessor, check a little farther along
+                // to see if it should actually be parsed as a class member.
                 switch (token()) {
-                    case 19:
-                    case 27:
-                    case 51:
-                    case 56:
-                    case 58:
-                    case 55:
+                    case 19 /* OpenParenToken */: // Method declaration
+                    case 27 /* LessThanToken */: // Generic Method declaration
+                    case 51 /* ExclamationToken */: // Non-null assertion on property name
+                    case 56 /* ColonToken */: // Type Annotation for declaration
+                    case 58 /* EqualsToken */: // Initializer for declaration
+                    case 55 /* QuestionToken */: // Not valid, but permitted so that it gets caught later on.
                         return true;
                     default:
+                        // Covers
+                        //  - Semicolons     (declaration termination)
+                        //  - Closing braces (end-of-class, must be declaration)
+                        //  - End-of-files   (not valid, but permitted so that it gets caught later on)
+                        //  - Line-breaks    (enabling *automatic semicolon insertion*)
                         return canParseSemicolon();
                 }
             }
@@ -15877,23 +20003,32 @@ var ts;
             var listPos = getNodePos();
             while (true) {
                 var decoratorStart = getNodePos();
-                if (!parseOptional(57)) {
+                if (!parseOptional(57 /* AtToken */)) {
                     break;
                 }
-                var decorator = createNode(150, decoratorStart);
+                var decorator = createNode(150 /* Decorator */, decoratorStart);
                 decorator.expression = doInDecoratorContext(parseLeftHandSideExpressionOrHigher);
                 finishNode(decorator);
                 (list || (list = [])).push(decorator);
             }
             return list && createNodeArray(list, listPos);
         }
+        /*
+         * There are situations in which a modifier like 'const' will appear unexpectedly, such as on a class member.
+         * In those situations, if we are entirely sure that 'const' is not valid on its own (such as when ASI takes effect
+         * and turns it into a standalone declaration), then it is better to parse it and report an error later.
+         *
+         * In such situations, 'permitInvalidConstAsModifier' should be set to true.
+         */
         function parseModifiers(permitInvalidConstAsModifier) {
             var list;
             var listPos = getNodePos();
             while (true) {
                 var modifierStart = scanner.getStartPos();
                 var modifierKind = token();
-                if (token() === 76 && permitInvalidConstAsModifier) {
+                if (token() === 76 /* ConstKeyword */ && permitInvalidConstAsModifier) {
+                    // We need to ensure that any subsequent modifiers appear on the same line
+                    // so that when 'const' is a standalone declaration, we don't issue an error.
                     if (!tryParse(nextTokenIsOnSameLineAndCanFollowModifier)) {
                         break;
                     }
@@ -15910,7 +20045,7 @@ var ts;
         }
         function parseModifiersForArrowFunction() {
             var modifiers;
-            if (token() === 120) {
+            if (token() === 120 /* AsyncKeyword */) {
                 var modifierStart = scanner.getStartPos();
                 var modifierKind = token();
                 nextToken();
@@ -15920,54 +20055,60 @@ var ts;
             return modifiers;
         }
         function parseClassElement() {
-            if (token() === 25) {
-                var result = createNode(212);
+            if (token() === 25 /* SemicolonToken */) {
+                var result = createNode(212 /* SemicolonClassElement */);
                 nextToken();
                 return finishNode(result);
             }
-            var node = createNodeWithJSDoc(0);
+            var node = createNodeWithJSDoc(0 /* Unknown */);
             node.decorators = parseDecorators();
-            node.modifiers = parseModifiers(true);
-            if (parseContextualModifier(125)) {
-                return parseAccessorDeclaration(node, 156);
+            node.modifiers = parseModifiers(/*permitInvalidConstAsModifier*/ true);
+            if (parseContextualModifier(125 /* GetKeyword */)) {
+                return parseAccessorDeclaration(node, 156 /* GetAccessor */);
             }
-            if (parseContextualModifier(136)) {
-                return parseAccessorDeclaration(node, 157);
+            if (parseContextualModifier(136 /* SetKeyword */)) {
+                return parseAccessorDeclaration(node, 157 /* SetAccessor */);
             }
-            if (token() === 123) {
+            if (token() === 123 /* ConstructorKeyword */) {
                 return parseConstructorDeclaration(node);
             }
             if (isIndexSignature()) {
                 return parseIndexSignatureDeclaration(node);
             }
+            // It is very important that we check this *after* checking indexers because
+            // the [ token can start an index signature or a computed property name
             if (ts.tokenIsIdentifierOrKeyword(token()) ||
-                token() === 9 ||
-                token() === 8 ||
-                token() === 39 ||
-                token() === 21) {
+                token() === 9 /* StringLiteral */ ||
+                token() === 8 /* NumericLiteral */ ||
+                token() === 39 /* AsteriskToken */ ||
+                token() === 21 /* OpenBracketToken */) {
                 return parsePropertyOrMethodDeclaration(node);
             }
             if (node.decorators || node.modifiers) {
-                node.name = createMissingNode(71, true, ts.Diagnostics.Declaration_expected);
+                // treat this as a property declaration with a missing name.
+                node.name = createMissingNode(71 /* Identifier */, /*reportAtCurrentPosition*/ true, ts.Diagnostics.Declaration_expected);
                 return parsePropertyDeclaration(node);
             }
+            // 'isClassMemberStart' should have hinted not to attempt parsing.
             return ts.Debug.fail("Should not have attempted to parse class member declaration.");
         }
         function parseClassExpression() {
-            return parseClassDeclarationOrExpression(createNodeWithJSDoc(0), 205);
+            return parseClassDeclarationOrExpression(createNodeWithJSDoc(0 /* Unknown */), 205 /* ClassExpression */);
         }
         function parseClassDeclaration(node) {
-            return parseClassDeclarationOrExpression(node, 235);
+            return parseClassDeclarationOrExpression(node, 235 /* ClassDeclaration */);
         }
         function parseClassDeclarationOrExpression(node, kind) {
             node.kind = kind;
-            parseExpected(75);
+            parseExpected(75 /* ClassKeyword */);
             node.name = parseNameOfClassDeclarationOrExpression();
             node.typeParameters = parseTypeParameters();
             node.heritageClauses = parseHeritageClauses();
-            if (parseExpected(17)) {
+            if (parseExpected(17 /* OpenBraceToken */)) {
+                // ClassTail[Yield,Await] : (Modified) See 14.5
+                //      ClassHeritage[?Yield,?Await]opt { ClassBody[?Yield,?Await]opt }
                 node.members = parseClassMembers();
-                parseExpected(18);
+                parseExpected(18 /* CloseBraceToken */);
             }
             else {
                 node.members = createMissingList();
@@ -15975,48 +20116,55 @@ var ts;
             return finishNode(node);
         }
         function parseNameOfClassDeclarationOrExpression() {
+            // implements is a future reserved word so
+            // 'class implements' might mean either
+            // - class expression with omitted name, 'implements' starts heritage clause
+            // - class with name 'implements'
+            // 'isImplementsClause' helps to disambiguate between these two cases
             return isIdentifier() && !isImplementsClause()
                 ? parseIdentifier()
                 : undefined;
         }
         function isImplementsClause() {
-            return token() === 108 && lookAhead(nextTokenIsIdentifierOrKeyword);
+            return token() === 108 /* ImplementsKeyword */ && lookAhead(nextTokenIsIdentifierOrKeyword);
         }
         function parseHeritageClauses() {
+            // ClassTail[Yield,Await] : (Modified) See 14.5
+            //      ClassHeritage[?Yield,?Await]opt { ClassBody[?Yield,?Await]opt }
             if (isHeritageClause()) {
-                return parseList(21, parseHeritageClause);
+                return parseList(21 /* HeritageClauses */, parseHeritageClause);
             }
             return undefined;
         }
         function parseHeritageClause() {
             var tok = token();
-            ts.Debug.assert(tok === 85 || tok === 108);
-            var node = createNode(268);
+            ts.Debug.assert(tok === 85 /* ExtendsKeyword */ || tok === 108 /* ImplementsKeyword */); // isListElement() should ensure this.
+            var node = createNode(268 /* HeritageClause */);
             node.token = tok;
             nextToken();
-            node.types = parseDelimitedList(7, parseExpressionWithTypeArguments);
+            node.types = parseDelimitedList(7 /* HeritageClauseElement */, parseExpressionWithTypeArguments);
             return finishNode(node);
         }
         function parseExpressionWithTypeArguments() {
-            var node = createNode(207);
+            var node = createNode(207 /* ExpressionWithTypeArguments */);
             node.expression = parseLeftHandSideExpressionOrHigher();
             node.typeArguments = tryParseTypeArguments();
             return finishNode(node);
         }
         function tryParseTypeArguments() {
-            return token() === 27
-                ? parseBracketedList(19, parseType, 27, 29)
+            return token() === 27 /* LessThanToken */
+                ? parseBracketedList(19 /* TypeArguments */, parseType, 27 /* LessThanToken */, 29 /* GreaterThanToken */)
                 : undefined;
         }
         function isHeritageClause() {
-            return token() === 85 || token() === 108;
+            return token() === 85 /* ExtendsKeyword */ || token() === 108 /* ImplementsKeyword */;
         }
         function parseClassMembers() {
-            return parseList(5, parseClassElement);
+            return parseList(5 /* ClassMembers */, parseClassElement);
         }
         function parseInterfaceDeclaration(node) {
-            node.kind = 236;
-            parseExpected(109);
+            node.kind = 236 /* InterfaceDeclaration */;
+            parseExpected(109 /* InterfaceKeyword */);
             node.name = parseIdentifier();
             node.typeParameters = parseTypeParameters();
             node.heritageClauses = parseHeritageClauses();
@@ -16024,28 +20172,32 @@ var ts;
             return finishNode(node);
         }
         function parseTypeAliasDeclaration(node) {
-            node.kind = 237;
-            parseExpected(139);
+            node.kind = 237 /* TypeAliasDeclaration */;
+            parseExpected(139 /* TypeKeyword */);
             node.name = parseIdentifier();
             node.typeParameters = parseTypeParameters();
-            parseExpected(58);
+            parseExpected(58 /* EqualsToken */);
             node.type = parseType();
             parseSemicolon();
             return finishNode(node);
         }
+        // In an ambient declaration, the grammar only allows integer literals as initializers.
+        // In a non-ambient declaration, the grammar allows uninitialized members only in a
+        // ConstantEnumMemberSection, which starts at the beginning of an enum declaration
+        // or any time an integer literal initializer is encountered.
         function parseEnumMember() {
-            var node = createNodeWithJSDoc(273);
+            var node = createNodeWithJSDoc(273 /* EnumMember */);
             node.name = parsePropertyName();
             node.initializer = allowInAnd(parseInitializer);
             return finishNode(node);
         }
         function parseEnumDeclaration(node) {
-            node.kind = 238;
-            parseExpected(83);
+            node.kind = 238 /* EnumDeclaration */;
+            parseExpected(83 /* EnumKeyword */);
             node.name = parseIdentifier();
-            if (parseExpected(17)) {
-                node.members = parseDelimitedList(6, parseEnumMember);
-                parseExpected(18);
+            if (parseExpected(17 /* OpenBraceToken */)) {
+                node.members = parseDelimitedList(6 /* EnumMembers */, parseEnumMember);
+                parseExpected(18 /* CloseBraceToken */);
             }
             else {
                 node.members = createMissingList();
@@ -16053,10 +20205,10 @@ var ts;
             return finishNode(node);
         }
         function parseModuleBlock() {
-            var node = createNode(240);
-            if (parseExpected(17)) {
-                node.statements = parseList(1, parseStatement);
-                parseExpected(18);
+            var node = createNode(240 /* ModuleBlock */);
+            if (parseExpected(17 /* OpenBraceToken */)) {
+                node.statements = parseList(1 /* BlockStatements */, parseStatement);
+                parseExpected(18 /* CloseBraceToken */);
             }
             else {
                 node.statements = createMissingList();
@@ -16064,26 +20216,29 @@ var ts;
             return finishNode(node);
         }
         function parseModuleOrNamespaceDeclaration(node, flags) {
-            node.kind = 239;
-            var namespaceFlag = flags & 16;
+            node.kind = 239 /* ModuleDeclaration */;
+            // If we are parsing a dotted namespace name, we want to
+            // propagate the 'Namespace' flag across the names if set.
+            var namespaceFlag = flags & 16 /* Namespace */;
             node.flags |= flags;
             node.name = parseIdentifier();
-            node.body = parseOptional(23)
-                ? parseModuleOrNamespaceDeclaration(createNode(0), 4 | namespaceFlag)
+            node.body = parseOptional(23 /* DotToken */)
+                ? parseModuleOrNamespaceDeclaration(createNode(0 /* Unknown */), 4 /* NestedNamespace */ | namespaceFlag)
                 : parseModuleBlock();
             return finishNode(node);
         }
         function parseAmbientExternalModuleDeclaration(node) {
-            node.kind = 239;
-            if (token() === 144) {
+            node.kind = 239 /* ModuleDeclaration */;
+            if (token() === 144 /* GlobalKeyword */) {
+                // parse 'global' as name of global scope augmentation
                 node.name = parseIdentifier();
-                node.flags |= 512;
+                node.flags |= 512 /* GlobalAugmentation */;
             }
             else {
                 node.name = parseLiteralNode();
                 node.name.text = internIdentifier(node.name.text);
             }
-            if (token() === 17) {
+            if (token() === 17 /* OpenBraceToken */) {
                 node.body = parseModuleBlock();
             }
             else {
@@ -16093,128 +20248,161 @@ var ts;
         }
         function parseModuleDeclaration(node) {
             var flags = 0;
-            if (token() === 144) {
+            if (token() === 144 /* GlobalKeyword */) {
+                // global augmentation
                 return parseAmbientExternalModuleDeclaration(node);
             }
-            else if (parseOptional(130)) {
-                flags |= 16;
+            else if (parseOptional(130 /* NamespaceKeyword */)) {
+                flags |= 16 /* Namespace */;
             }
             else {
-                parseExpected(129);
-                if (token() === 9) {
+                parseExpected(129 /* ModuleKeyword */);
+                if (token() === 9 /* StringLiteral */) {
                     return parseAmbientExternalModuleDeclaration(node);
                 }
             }
             return parseModuleOrNamespaceDeclaration(node, flags);
         }
         function isExternalModuleReference() {
-            return token() === 133 &&
+            return token() === 133 /* RequireKeyword */ &&
                 lookAhead(nextTokenIsOpenParen);
         }
         function nextTokenIsOpenParen() {
-            return nextToken() === 19;
+            return nextToken() === 19 /* OpenParenToken */;
         }
         function nextTokenIsSlash() {
-            return nextToken() === 41;
+            return nextToken() === 41 /* SlashToken */;
         }
         function parseNamespaceExportDeclaration(node) {
-            node.kind = 242;
-            parseExpected(118);
-            parseExpected(130);
+            node.kind = 242 /* NamespaceExportDeclaration */;
+            parseExpected(118 /* AsKeyword */);
+            parseExpected(130 /* NamespaceKeyword */);
             node.name = parseIdentifier();
             parseSemicolon();
             return finishNode(node);
         }
         function parseImportDeclarationOrImportEqualsDeclaration(node) {
-            parseExpected(91);
+            parseExpected(91 /* ImportKeyword */);
             var afterImportPos = scanner.getStartPos();
             var identifier;
             if (isIdentifier()) {
                 identifier = parseIdentifier();
-                if (token() !== 26 && token() !== 143) {
+                if (token() !== 26 /* CommaToken */ && token() !== 143 /* FromKeyword */) {
                     return parseImportEqualsDeclaration(node, identifier);
                 }
             }
-            node.kind = 244;
-            if (identifier ||
-                token() === 39 ||
-                token() === 17) {
+            // Import statement
+            node.kind = 244 /* ImportDeclaration */;
+            // ImportDeclaration:
+            //  import ImportClause from ModuleSpecifier ;
+            //  import ModuleSpecifier;
+            if (identifier || // import id
+                token() === 39 /* AsteriskToken */ || // import *
+                token() === 17 /* OpenBraceToken */) { // import {
                 node.importClause = parseImportClause(identifier, afterImportPos);
-                parseExpected(143);
+                parseExpected(143 /* FromKeyword */);
             }
             node.moduleSpecifier = parseModuleSpecifier();
             parseSemicolon();
             return finishNode(node);
         }
         function parseImportEqualsDeclaration(node, identifier) {
-            node.kind = 243;
+            node.kind = 243 /* ImportEqualsDeclaration */;
             node.name = identifier;
-            parseExpected(58);
+            parseExpected(58 /* EqualsToken */);
             node.moduleReference = parseModuleReference();
             parseSemicolon();
             return finishNode(node);
         }
         function parseImportClause(identifier, fullStart) {
-            var importClause = createNode(245, fullStart);
+            // ImportClause:
+            //  ImportedDefaultBinding
+            //  NameSpaceImport
+            //  NamedImports
+            //  ImportedDefaultBinding, NameSpaceImport
+            //  ImportedDefaultBinding, NamedImports
+            var importClause = createNode(245 /* ImportClause */, fullStart);
             if (identifier) {
+                // ImportedDefaultBinding:
+                //  ImportedBinding
                 importClause.name = identifier;
             }
+            // If there was no default import or if there is comma token after default import
+            // parse namespace or named imports
             if (!importClause.name ||
-                parseOptional(26)) {
-                importClause.namedBindings = token() === 39 ? parseNamespaceImport() : parseNamedImportsOrExports(247);
+                parseOptional(26 /* CommaToken */)) {
+                importClause.namedBindings = token() === 39 /* AsteriskToken */ ? parseNamespaceImport() : parseNamedImportsOrExports(247 /* NamedImports */);
             }
             return finishNode(importClause);
         }
         function parseModuleReference() {
             return isExternalModuleReference()
                 ? parseExternalModuleReference()
-                : parseEntityName(false);
+                : parseEntityName(/*allowReservedWords*/ false);
         }
         function parseExternalModuleReference() {
-            var node = createNode(254);
-            parseExpected(133);
-            parseExpected(19);
+            var node = createNode(254 /* ExternalModuleReference */);
+            parseExpected(133 /* RequireKeyword */);
+            parseExpected(19 /* OpenParenToken */);
             node.expression = parseModuleSpecifier();
-            parseExpected(20);
+            parseExpected(20 /* CloseParenToken */);
             return finishNode(node);
         }
         function parseModuleSpecifier() {
-            if (token() === 9) {
+            if (token() === 9 /* StringLiteral */) {
                 var result = parseLiteralNode();
                 result.text = internIdentifier(result.text);
                 return result;
             }
             else {
+                // We allow arbitrary expressions here, even though the grammar only allows string
+                // literals.  We check to ensure that it is only a string literal later in the grammar
+                // check pass.
                 return parseExpression();
             }
         }
         function parseNamespaceImport() {
-            var namespaceImport = createNode(246);
-            parseExpected(39);
-            parseExpected(118);
+            // NameSpaceImport:
+            //  * as ImportedBinding
+            var namespaceImport = createNode(246 /* NamespaceImport */);
+            parseExpected(39 /* AsteriskToken */);
+            parseExpected(118 /* AsKeyword */);
             namespaceImport.name = parseIdentifier();
             return finishNode(namespaceImport);
         }
         function parseNamedImportsOrExports(kind) {
             var node = createNode(kind);
-            node.elements = parseBracketedList(22, kind === 247 ? parseImportSpecifier : parseExportSpecifier, 17, 18);
+            // NamedImports:
+            //  { }
+            //  { ImportsList }
+            //  { ImportsList, }
+            // ImportsList:
+            //  ImportSpecifier
+            //  ImportsList, ImportSpecifier
+            node.elements = parseBracketedList(22 /* ImportOrExportSpecifiers */, kind === 247 /* NamedImports */ ? parseImportSpecifier : parseExportSpecifier, 17 /* OpenBraceToken */, 18 /* CloseBraceToken */);
             return finishNode(node);
         }
         function parseExportSpecifier() {
-            return parseImportOrExportSpecifier(252);
+            return parseImportOrExportSpecifier(252 /* ExportSpecifier */);
         }
         function parseImportSpecifier() {
-            return parseImportOrExportSpecifier(248);
+            return parseImportOrExportSpecifier(248 /* ImportSpecifier */);
         }
         function parseImportOrExportSpecifier(kind) {
             var node = createNode(kind);
+            // ImportSpecifier:
+            //   BindingIdentifier
+            //   IdentifierName as BindingIdentifier
+            // ExportSpecifier:
+            //   IdentifierName
+            //   IdentifierName as IdentifierName
             var checkIdentifierIsKeyword = ts.isKeyword(token()) && !isIdentifier();
             var checkIdentifierStart = scanner.getTokenPos();
             var checkIdentifierEnd = scanner.getTextPos();
             var identifierName = parseIdentifierName();
-            if (token() === 118) {
+            if (token() === 118 /* AsKeyword */) {
                 node.propertyName = identifierName;
-                parseExpected(118);
+                parseExpected(118 /* AsKeyword */);
                 checkIdentifierIsKeyword = ts.isKeyword(token()) && !isIdentifier();
                 checkIdentifierStart = scanner.getTokenPos();
                 checkIdentifierEnd = scanner.getTextPos();
@@ -16223,21 +20411,24 @@ var ts;
             else {
                 node.name = identifierName;
             }
-            if (kind === 248 && checkIdentifierIsKeyword) {
+            if (kind === 248 /* ImportSpecifier */ && checkIdentifierIsKeyword) {
                 parseErrorAt(checkIdentifierStart, checkIdentifierEnd, ts.Diagnostics.Identifier_expected);
             }
             return finishNode(node);
         }
         function parseExportDeclaration(node) {
-            node.kind = 250;
-            if (parseOptional(39)) {
-                parseExpected(143);
+            node.kind = 250 /* ExportDeclaration */;
+            if (parseOptional(39 /* AsteriskToken */)) {
+                parseExpected(143 /* FromKeyword */);
                 node.moduleSpecifier = parseModuleSpecifier();
             }
             else {
-                node.exportClause = parseNamedImportsOrExports(251);
-                if (token() === 143 || (token() === 9 && !scanner.hasPrecedingLineBreak())) {
-                    parseExpected(143);
+                node.exportClause = parseNamedImportsOrExports(251 /* NamedExports */);
+                // It is not uncommon to accidentally omit the 'from' keyword. Additionally, in editing scenarios,
+                // the 'from' keyword can be parsed as a named export when the export clause is unterminated (i.e. `export { from "moduleName";`)
+                // If we don't have a 'from' keyword, see if we have a string literal such that ASI won't take effect.
+                if (token() === 143 /* FromKeyword */ || (token() === 9 /* StringLiteral */ && !scanner.hasPrecedingLineBreak())) {
+                    parseExpected(143 /* FromKeyword */);
                     node.moduleSpecifier = parseModuleSpecifier();
                 }
             }
@@ -16245,33 +20436,35 @@ var ts;
             return finishNode(node);
         }
         function parseExportAssignment(node) {
-            node.kind = 249;
-            if (parseOptional(58)) {
+            node.kind = 249 /* ExportAssignment */;
+            if (parseOptional(58 /* EqualsToken */)) {
                 node.isExportEquals = true;
             }
             else {
-                parseExpected(79);
+                parseExpected(79 /* DefaultKeyword */);
             }
             node.expression = parseAssignmentExpressionOrHigher();
             parseSemicolon();
             return finishNode(node);
         }
         function setExternalModuleIndicator(sourceFile) {
+            // Try to use the first top-level import/export when available, then
+            // fall back to looking for an 'import.meta' somewhere in the tree if necessary.
             sourceFile.externalModuleIndicator =
                 ts.forEach(sourceFile.statements, isAnExternalModuleIndicatorNode) ||
                     getImportMetaIfNecessary(sourceFile);
         }
         function isAnExternalModuleIndicatorNode(node) {
-            return ts.hasModifier(node, 1)
-                || node.kind === 243 && node.moduleReference.kind === 254
-                || node.kind === 244
-                || node.kind === 249
-                || node.kind === 250
+            return ts.hasModifier(node, 1 /* Export */)
+                || node.kind === 243 /* ImportEqualsDeclaration */ && node.moduleReference.kind === 254 /* ExternalModuleReference */
+                || node.kind === 244 /* ImportDeclaration */
+                || node.kind === 249 /* ExportAssignment */
+                || node.kind === 250 /* ExportDeclaration */
                 ? node
                 : undefined;
         }
         function getImportMetaIfNecessary(sourceFile) {
-            return sourceFile.flags & 1048576 ?
+            return sourceFile.flags & 1048576 /* PossiblyContainsImportMeta */ ?
                 walkTreeForExternalModuleIndicators(sourceFile) :
                 undefined;
         }
@@ -16279,13 +20472,46 @@ var ts;
             return isImportMeta(node) ? node : forEachChild(node, walkTreeForExternalModuleIndicators);
         }
         function isImportMeta(node) {
-            return ts.isMetaProperty(node) && node.keywordToken === 91 && node.name.escapedText === "meta";
+            return ts.isMetaProperty(node) && node.keywordToken === 91 /* ImportKeyword */ && node.name.escapedText === "meta";
         }
+        var ParsingContext;
+        (function (ParsingContext) {
+            ParsingContext[ParsingContext["SourceElements"] = 0] = "SourceElements";
+            ParsingContext[ParsingContext["BlockStatements"] = 1] = "BlockStatements";
+            ParsingContext[ParsingContext["SwitchClauses"] = 2] = "SwitchClauses";
+            ParsingContext[ParsingContext["SwitchClauseStatements"] = 3] = "SwitchClauseStatements";
+            ParsingContext[ParsingContext["TypeMembers"] = 4] = "TypeMembers";
+            ParsingContext[ParsingContext["ClassMembers"] = 5] = "ClassMembers";
+            ParsingContext[ParsingContext["EnumMembers"] = 6] = "EnumMembers";
+            ParsingContext[ParsingContext["HeritageClauseElement"] = 7] = "HeritageClauseElement";
+            ParsingContext[ParsingContext["VariableDeclarations"] = 8] = "VariableDeclarations";
+            ParsingContext[ParsingContext["ObjectBindingElements"] = 9] = "ObjectBindingElements";
+            ParsingContext[ParsingContext["ArrayBindingElements"] = 10] = "ArrayBindingElements";
+            ParsingContext[ParsingContext["ArgumentExpressions"] = 11] = "ArgumentExpressions";
+            ParsingContext[ParsingContext["ObjectLiteralMembers"] = 12] = "ObjectLiteralMembers";
+            ParsingContext[ParsingContext["JsxAttributes"] = 13] = "JsxAttributes";
+            ParsingContext[ParsingContext["JsxChildren"] = 14] = "JsxChildren";
+            ParsingContext[ParsingContext["ArrayLiteralMembers"] = 15] = "ArrayLiteralMembers";
+            ParsingContext[ParsingContext["Parameters"] = 16] = "Parameters";
+            ParsingContext[ParsingContext["RestProperties"] = 17] = "RestProperties";
+            ParsingContext[ParsingContext["TypeParameters"] = 18] = "TypeParameters";
+            ParsingContext[ParsingContext["TypeArguments"] = 19] = "TypeArguments";
+            ParsingContext[ParsingContext["TupleElementTypes"] = 20] = "TupleElementTypes";
+            ParsingContext[ParsingContext["HeritageClauses"] = 21] = "HeritageClauses";
+            ParsingContext[ParsingContext["ImportOrExportSpecifiers"] = 22] = "ImportOrExportSpecifiers";
+            ParsingContext[ParsingContext["Count"] = 23] = "Count"; // Number of parsing contexts
+        })(ParsingContext || (ParsingContext = {}));
+        var Tristate;
+        (function (Tristate) {
+            Tristate[Tristate["False"] = 0] = "False";
+            Tristate[Tristate["True"] = 1] = "True";
+            Tristate[Tristate["Unknown"] = 2] = "Unknown";
+        })(Tristate || (Tristate = {}));
         var JSDocParser;
         (function (JSDocParser) {
             function parseJSDocTypeExpressionForTests(content, start, length) {
-                initializeState(content, 6, undefined, 1);
-                sourceFile = createSourceFile("file.js", 6, 1, false);
+                initializeState(content, 6 /* Latest */, /*_syntaxCursor:*/ undefined, 1 /* JS */);
+                sourceFile = createSourceFile("file.js", 6 /* Latest */, 1 /* JS */, /*isDeclarationFile*/ false);
                 scanner.setText(content, start, length);
                 currentToken = scanner.scan();
                 var jsDocTypeExpression = parseJSDocTypeExpression();
@@ -16294,20 +20520,21 @@ var ts;
                 return jsDocTypeExpression ? { jsDocTypeExpression: jsDocTypeExpression, diagnostics: diagnostics } : undefined;
             }
             JSDocParser.parseJSDocTypeExpressionForTests = parseJSDocTypeExpressionForTests;
+            // Parses out a JSDoc type expression.
             function parseJSDocTypeExpression(mayOmitBraces) {
-                var result = createNode(278, scanner.getTokenPos());
-                var hasBrace = (mayOmitBraces ? parseOptional : parseExpected)(17);
-                result.type = doInsideOfContext(2097152, parseJSDocType);
+                var result = createNode(278 /* JSDocTypeExpression */, scanner.getTokenPos());
+                var hasBrace = (mayOmitBraces ? parseOptional : parseExpected)(17 /* OpenBraceToken */);
+                result.type = doInsideOfContext(2097152 /* JSDoc */, parseJSDocType);
                 if (!mayOmitBraces || hasBrace) {
-                    parseExpected(18);
+                    parseExpected(18 /* CloseBraceToken */);
                 }
                 fixupParentReferences(result);
                 return finishNode(result);
             }
             JSDocParser.parseJSDocTypeExpression = parseJSDocTypeExpression;
             function parseIsolatedJSDocComment(content, start, length) {
-                initializeState(content, 6, undefined, 1);
-                sourceFile = { languageVariant: 0, text: content };
+                initializeState(content, 6 /* Latest */, /*_syntaxCursor:*/ undefined, 1 /* JS */);
+                sourceFile = { languageVariant: 0 /* Standard */, text: content }; // tslint:disable-line no-object-literal-type-assertion
                 var jsDoc = parseJSDocCommentWorker(start, length);
                 var diagnostics = parseDiagnostics;
                 clearState();
@@ -16323,7 +20550,7 @@ var ts;
                 if (comment) {
                     comment.parent = parent;
                 }
-                if (contextFlags & 65536) {
+                if (contextFlags & 65536 /* JavaScriptFile */) {
                     if (!sourceFile.jsDocDiagnostics) {
                         sourceFile.jsDocDiagnostics = [];
                     }
@@ -16335,6 +20562,18 @@ var ts;
                 return comment;
             }
             JSDocParser.parseJSDocComment = parseJSDocComment;
+            var JSDocState;
+            (function (JSDocState) {
+                JSDocState[JSDocState["BeginningOfLine"] = 0] = "BeginningOfLine";
+                JSDocState[JSDocState["SawAsterisk"] = 1] = "SawAsterisk";
+                JSDocState[JSDocState["SavingComments"] = 2] = "SavingComments";
+            })(JSDocState || (JSDocState = {}));
+            var PropertyLikeParse;
+            (function (PropertyLikeParse) {
+                PropertyLikeParse[PropertyLikeParse["Property"] = 1] = "Property";
+                PropertyLikeParse[PropertyLikeParse["Parameter"] = 2] = "Parameter";
+                PropertyLikeParse[PropertyLikeParse["CallbackParameter"] = 4] = "CallbackParameter";
+            })(PropertyLikeParse || (PropertyLikeParse = {}));
             function parseJSDocCommentWorker(start, length) {
                 if (start === void 0) { start = 0; }
                 var content = sourceText;
@@ -16348,12 +20587,17 @@ var ts;
                 var tagsEnd;
                 var comments = [];
                 var result;
+                // Check for /** (JSDoc opening part)
                 if (!isJSDocLikeText(content, start)) {
                     return result;
                 }
+                // + 3 for leading /**, - 5 in total for /** */
                 scanner.scanRange(start + 3, length - 5, function () {
-                    var state = 1;
+                    // Initially we can parse out a tag.  We also have seen a starting asterisk.
+                    // This is so that /** * @type */ doesn't parse.
+                    var state = 1 /* SawAsterisk */;
                     var margin;
+                    // + 4 for leading '/** '
                     var indent = start - Math.max(content.lastIndexOf("\n", start), 0) + 4;
                     function pushComment(text) {
                         if (!margin) {
@@ -16363,19 +20607,22 @@ var ts;
                         indent += text.length;
                     }
                     nextJSDocToken();
-                    while (parseOptionalJsdoc(5))
+                    while (parseOptionalJsdoc(5 /* WhitespaceTrivia */))
                         ;
-                    if (parseOptionalJsdoc(4)) {
-                        state = 0;
+                    if (parseOptionalJsdoc(4 /* NewLineTrivia */)) {
+                        state = 0 /* BeginningOfLine */;
                         indent = 0;
                     }
                     loop: while (true) {
                         switch (token()) {
-                            case 57:
-                                if (state === 0 || state === 1) {
+                            case 57 /* AtToken */:
+                                if (state === 0 /* BeginningOfLine */ || state === 1 /* SawAsterisk */) {
                                     removeTrailingNewlines(comments);
                                     addTag(parseTag(indent));
-                                    state = 0;
+                                    // NOTE: According to usejsdoc.org, a tag goes to end of line, except the last tag.
+                                    // Real-world comments may break this rule, so "BeginningOfLine" will not be a real line beginning
+                                    // for malformed examples like `/** @param {string} x @returns {number} the length */`
+                                    state = 0 /* BeginningOfLine */;
                                     margin = undefined;
                                     indent++;
                                 }
@@ -16383,29 +20630,35 @@ var ts;
                                     pushComment(scanner.getTokenText());
                                 }
                                 break;
-                            case 4:
+                            case 4 /* NewLineTrivia */:
                                 comments.push(scanner.getTokenText());
-                                state = 0;
+                                state = 0 /* BeginningOfLine */;
                                 indent = 0;
                                 break;
-                            case 39:
+                            case 39 /* AsteriskToken */:
                                 var asterisk = scanner.getTokenText();
-                                if (state === 1 || state === 2) {
-                                    state = 2;
+                                if (state === 1 /* SawAsterisk */ || state === 2 /* SavingComments */) {
+                                    // If we've already seen an asterisk, then we can no longer parse a tag on this line
+                                    state = 2 /* SavingComments */;
                                     pushComment(asterisk);
                                 }
                                 else {
-                                    state = 1;
+                                    // Ignore the first asterisk on a line
+                                    state = 1 /* SawAsterisk */;
                                     indent += asterisk.length;
                                 }
                                 break;
-                            case 71:
+                            case 71 /* Identifier */:
+                                // Anything else is doc comment text. We just save it. Because it
+                                // wasn't a tag, we can no longer parse a tag on this line until we hit the next
+                                // line break.
                                 pushComment(scanner.getTokenText());
-                                state = 2;
+                                state = 2 /* SavingComments */;
                                 break;
-                            case 5:
+                            case 5 /* WhitespaceTrivia */:
+                                // only collect whitespace if we're already saving comments or have just crossed the comment indent margin
                                 var whitespace = scanner.getTokenText();
-                                if (state === 2) {
+                                if (state === 2 /* SavingComments */) {
                                     comments.push(whitespace);
                                 }
                                 else if (margin !== undefined && indent + whitespace.length > margin) {
@@ -16413,10 +20666,11 @@ var ts;
                                 }
                                 indent += whitespace.length;
                                 break;
-                            case 1:
+                            case 1 /* EndOfFileToken */:
                                 break loop;
                             default:
-                                state = 2;
+                                // anything other than whitespace or asterisk at the beginning of the line starts the comment text
+                                state = 2 /* SavingComments */;
                                 pushComment(scanner.getTokenText());
                                 break;
                         }
@@ -16438,92 +20692,83 @@ var ts;
                     }
                 }
                 function createJSDocComment() {
-                    var result = createNode(286, start);
+                    var result = createNode(286 /* JSDocComment */, start);
                     result.tags = tags && createNodeArray(tags, tagsPos, tagsEnd);
                     result.comment = comments.length ? comments.join("") : undefined;
                     return finishNode(result, end);
                 }
                 function isNextNonwhitespaceTokenEndOfFile() {
+                    // We must use infinite lookahead, as there could be any number of newlines :(
                     while (true) {
                         nextJSDocToken();
-                        if (token() === 1) {
+                        if (token() === 1 /* EndOfFileToken */) {
                             return true;
                         }
-                        if (!(token() === 5 || token() === 4)) {
+                        if (!(token() === 5 /* WhitespaceTrivia */ || token() === 4 /* NewLineTrivia */)) {
                             return false;
                         }
                     }
                 }
                 function skipWhitespace() {
-                    if (token() === 5 || token() === 4) {
+                    if (token() === 5 /* WhitespaceTrivia */ || token() === 4 /* NewLineTrivia */) {
                         if (lookAhead(isNextNonwhitespaceTokenEndOfFile)) {
-                            return;
+                            return; // Don't skip whitespace prior to EoF (or end of comment) - that shouldn't be included in any node's range
                         }
                     }
-                    while (token() === 5 || token() === 4) {
+                    while (token() === 5 /* WhitespaceTrivia */ || token() === 4 /* NewLineTrivia */) {
                         nextJSDocToken();
                     }
                 }
                 function parseTag(indent) {
-                    ts.Debug.assert(token() === 57);
-                    var atToken = createNode(57, scanner.getTokenPos());
+                    ts.Debug.assert(token() === 57 /* AtToken */);
+                    var atToken = createNode(57 /* AtToken */, scanner.getTokenPos());
                     atToken.end = scanner.getTextPos();
                     nextJSDocToken();
                     var tagName = parseJSDocIdentifierName();
                     skipWhitespace();
-                    if (!tagName) {
-                        return;
-                    }
                     var tag;
-                    if (tagName) {
-                        switch (tagName.escapedText) {
-                            case "augments":
-                            case "extends":
-                                tag = parseAugmentsTag(atToken, tagName);
-                                break;
-                            case "class":
-                            case "constructor":
-                                tag = parseClassTag(atToken, tagName);
-                                break;
-                            case "arg":
-                            case "argument":
-                            case "param":
-                                return parseParameterOrPropertyTag(atToken, tagName, 2, indent);
-                            case "return":
-                            case "returns":
-                                tag = parseReturnTag(atToken, tagName);
-                                break;
-                            case "template":
-                                tag = parseTemplateTag(atToken, tagName);
-                                break;
-                            case "type":
-                                tag = parseTypeTag(atToken, tagName);
-                                break;
-                            case "typedef":
-                                tag = parseTypedefTag(atToken, tagName, indent);
-                                break;
-                            case "callback":
-                                tag = parseCallbackTag(atToken, tagName, indent);
-                                break;
-                            default:
-                                tag = parseUnknownTag(atToken, tagName);
-                                break;
-                        }
-                    }
-                    else {
-                        tag = parseUnknownTag(atToken, tagName);
-                    }
-                    if (!tag) {
-                        return;
+                    switch (tagName.escapedText) {
+                        case "augments":
+                        case "extends":
+                            tag = parseAugmentsTag(atToken, tagName);
+                            break;
+                        case "class":
+                        case "constructor":
+                            tag = parseClassTag(atToken, tagName);
+                            break;
+                        case "arg":
+                        case "argument":
+                        case "param":
+                            return parseParameterOrPropertyTag(atToken, tagName, 2 /* Parameter */, indent);
+                        case "return":
+                        case "returns":
+                            tag = parseReturnTag(atToken, tagName);
+                            break;
+                        case "template":
+                            tag = parseTemplateTag(atToken, tagName);
+                            break;
+                        case "type":
+                            tag = parseTypeTag(atToken, tagName);
+                            break;
+                        case "typedef":
+                            tag = parseTypedefTag(atToken, tagName, indent);
+                            break;
+                        case "callback":
+                            tag = parseCallbackTag(atToken, tagName, indent);
+                            break;
+                        default:
+                            tag = parseUnknownTag(atToken, tagName);
+                            break;
                     }
                     if (!tag.comment) {
+                        // some tags, like typedef and callback, have already parsed their comments earlier
                         tag.comment = parseTagComments(indent + tag.end - tag.pos);
                     }
                     return tag;
                 }
                 function parseTagComments(indent) {
                     var comments = [];
-                    var state = 0;
+                    var state = 0 /* BeginningOfLine */;
                     var margin;
                     function pushComment(text) {
                         if (!margin) {
@@ -16535,37 +20780,43 @@ var ts;
                     var tok = token();
                     loop: while (true) {
                         switch (tok) {
-                            case 4:
-                                if (state >= 1) {
-                                    state = 0;
+                            case 4 /* NewLineTrivia */:
+                                if (state >= 1 /* SawAsterisk */) {
+                                    state = 0 /* BeginningOfLine */;
                                     comments.push(scanner.getTokenText());
                                 }
                                 indent = 0;
                                 break;
-                            case 57:
+                            case 57 /* AtToken */:
                                 scanner.setTextPos(scanner.getTextPos() - 1);
-                            case 1:
+                            // falls through
+                            case 1 /* EndOfFileToken */:
+                                // Done
                                 break loop;
-                            case 5:
-                                if (state === 2) {
+                            case 5 /* WhitespaceTrivia */:
+                                if (state === 2 /* SavingComments */) {
                                     pushComment(scanner.getTokenText());
                                 }
                                 else {
                                     var whitespace = scanner.getTokenText();
+                                    // if the whitespace crosses the margin, take only the whitespace that passes the margin
                                     if (margin !== undefined && indent + whitespace.length > margin) {
                                         comments.push(whitespace.slice(margin - indent - 1));
                                     }
                                     indent += whitespace.length;
                                 }
                                 break;
-                            case 39:
-                                if (state === 0) {
-                                    state = 1;
+                            case 39 /* AsteriskToken */:
+                                if (state === 0 /* BeginningOfLine */) {
+                                    // leading asterisks start recording on the *next* (non-whitespace) token
+                                    state = 1 /* SawAsterisk */;
                                     indent += 1;
                                     break;
                                 }
+                            // record the * as a comment
+                            // falls through
                             default:
-                                state = 2;
+                                state = 2 /* SavingComments */; // leading identifiers start recording as well
                                 pushComment(scanner.getTokenText());
                                 break;
                         }
@@ -16576,7 +20827,7 @@ var ts;
                     return comments.length === 0 ? undefined : comments.join("");
                 }
                 function parseUnknownTag(atToken, tagName) {
-                    var result = createNode(289, atToken.pos);
+                    var result = createNode(289 /* JSDocTag */, atToken.pos);
                     result.atToken = atToken;
                     result.tagName = tagName;
                     return finishNode(result);
@@ -16596,28 +20847,31 @@ var ts;
                 }
                 function tryParseTypeExpression() {
                     skipWhitespace();
-                    return token() === 17 ? parseJSDocTypeExpression() : undefined;
+                    return token() === 17 /* OpenBraceToken */ ? parseJSDocTypeExpression() : undefined;
                 }
                 function parseBracketNameInPropertyAndParamTag() {
-                    if (token() === 13) {
-                        return { name: createIdentifier(true), isBracketed: false };
+                    if (token() === 13 /* NoSubstitutionTemplateLiteral */) {
+                        // a markdown-quoted name: `arg` is not legal jsdoc, but occurs in the wild
+                        return { name: createIdentifier(/*isIdentifier*/ true), isBracketed: false };
                     }
-                    var isBracketed = parseOptional(21);
+                    // Looking for something like '[foo]', 'foo', '[foo.bar]' or 'foo.bar'
+                    var isBracketed = parseOptional(21 /* OpenBracketToken */);
                     var name = parseJSDocEntityName();
                     if (isBracketed) {
                         skipWhitespace();
-                        if (parseOptionalToken(58)) {
+                        // May have an optional default, e.g. '[foo = 42]'
+                        if (parseOptionalToken(58 /* EqualsToken */)) {
                             parseExpression();
                         }
-                        parseExpected(22);
+                        parseExpected(22 /* CloseBracketToken */);
                     }
                     return { name: name, isBracketed: isBracketed };
                 }
                 function isObjectOrObjectArrayTypeReference(node) {
                     switch (node.kind) {
-                        case 135:
+                        case 135 /* ObjectKeyword */:
                             return true;
-                        case 167:
+                        case 167 /* ArrayType */:
                             return isObjectOrObjectArrayTypeReference(node.elementType);
                         default:
                             return ts.isTypeReferenceNode(node) && ts.isIdentifier(node.typeName) && node.typeName.escapedText === "Object";
@@ -16632,13 +20886,13 @@ var ts;
                     if (isNameFirst) {
                         typeExpression = tryParseTypeExpression();
                     }
-                    var result = target === 1 ?
-                        createNode(298, atToken.pos) :
-                        createNode(293, atToken.pos);
+                    var result = target === 1 /* Property */ ?
+                        createNode(298 /* JSDocPropertyTag */, atToken.pos) :
+                        createNode(293 /* JSDocParameterTag */, atToken.pos);
                     var comment;
                     if (indent !== undefined)
                         comment = parseTagComments(indent + scanner.getStartPos() - atToken.pos);
-                    var nestedTypeLiteral = target !== 4 && parseNestedTypeLiteral(typeExpression, name, target);
+                    var nestedTypeLiteral = target !== 4 /* CallbackParameter */ && parseNestedTypeLiteral(typeExpression, name, target);
                     if (nestedTypeLiteral) {
                         typeExpression = nestedTypeLiteral;
                         isNameFirst = true;
@@ -16654,20 +20908,20 @@ var ts;
                 }
                 function parseNestedTypeLiteral(typeExpression, name, target) {
                     if (typeExpression && isObjectOrObjectArrayTypeReference(typeExpression.type)) {
-                        var typeLiteralExpression = createNode(278, scanner.getTokenPos());
+                        var typeLiteralExpression = createNode(278 /* JSDocTypeExpression */, scanner.getTokenPos());
                         var child = void 0;
                         var jsdocTypeLiteral = void 0;
                         var start_2 = scanner.getStartPos();
                         var children = void 0;
                         while (child = tryParse(function () { return parseChildParameterOrPropertyTag(target, name); })) {
-                            if (child.kind === 293 || child.kind === 298) {
+                            if (child.kind === 293 /* JSDocParameterTag */ || child.kind === 298 /* JSDocPropertyTag */) {
                                 children = ts.append(children, child);
                             }
                         }
                         if (children) {
-                            jsdocTypeLiteral = createNode(287, start_2);
+                            jsdocTypeLiteral = createNode(287 /* JSDocTypeLiteral */, start_2);
                             jsdocTypeLiteral.jsDocPropertyTags = children;
-                            if (typeExpression.type.kind === 167) {
+                            if (typeExpression.type.kind === 167 /* ArrayType */) {
                                 jsdocTypeLiteral.isArrayType = true;
                             }
                             typeLiteralExpression.type = finishNode(jsdocTypeLiteral);
@@ -16676,47 +20930,47 @@ var ts;
                     }
                 }
                 function parseReturnTag(atToken, tagName) {
-                    if (ts.forEach(tags, function (t) { return t.kind === 294; })) {
+                    if (ts.forEach(tags, function (t) { return t.kind === 294 /* JSDocReturnTag */; })) {
                         parseErrorAt(tagName.pos, scanner.getTokenPos(), ts.Diagnostics._0_tag_already_specified, tagName.escapedText);
                     }
-                    var result = createNode(294, atToken.pos);
+                    var result = createNode(294 /* JSDocReturnTag */, atToken.pos);
                     result.atToken = atToken;
                     result.tagName = tagName;
                     result.typeExpression = tryParseTypeExpression();
                     return finishNode(result);
                 }
                 function parseTypeTag(atToken, tagName) {
-                    if (ts.forEach(tags, function (t) { return t.kind === 295; })) {
+                    if (ts.forEach(tags, function (t) { return t.kind === 295 /* JSDocTypeTag */; })) {
                         parseErrorAt(tagName.pos, scanner.getTokenPos(), ts.Diagnostics._0_tag_already_specified, tagName.escapedText);
                     }
-                    var result = createNode(295, atToken.pos);
+                    var result = createNode(295 /* JSDocTypeTag */, atToken.pos);
                     result.atToken = atToken;
                     result.tagName = tagName;
-                    result.typeExpression = parseJSDocTypeExpression(true);
+                    result.typeExpression = parseJSDocTypeExpression(/*mayOmitBraces*/ true);
                     return finishNode(result);
                 }
                 function parseAugmentsTag(atToken, tagName) {
-                    var result = createNode(290, atToken.pos);
+                    var result = createNode(290 /* JSDocAugmentsTag */, atToken.pos);
                     result.atToken = atToken;
                     result.tagName = tagName;
                     result.class = parseExpressionWithTypeArgumentsForAugments();
                     return finishNode(result);
                 }
                 function parseExpressionWithTypeArgumentsForAugments() {
-                    var usedBrace = parseOptional(17);
-                    var node = createNode(207);
+                    var usedBrace = parseOptional(17 /* OpenBraceToken */);
+                    var node = createNode(207 /* ExpressionWithTypeArguments */);
                     node.expression = parsePropertyAccessEntityNameExpression();
                     node.typeArguments = tryParseTypeArguments();
                     var res = finishNode(node);
                     if (usedBrace) {
-                        parseExpected(18);
+                        parseExpected(18 /* CloseBraceToken */);
                     }
                     return res;
                 }
                 function parsePropertyAccessEntityNameExpression() {
-                    var node = parseJSDocIdentifierName(true);
-                    while (parseOptional(23)) {
-                        var prop = createNode(185, node.pos);
+                    var node = parseJSDocIdentifierName();
+                    while (parseOptional(23 /* DotToken */)) {
+                        var prop = createNode(185 /* PropertyAccessExpression */, node.pos);
                         prop.expression = node;
                         prop.name = parseJSDocIdentifierName();
                         node = finishNode(prop);
@@ -16724,7 +20978,7 @@ var ts;
                     return node;
                 }
                 function parseClassTag(atToken, tagName) {
-                    var tag = createNode(291, atToken.pos);
+                    var tag = createNode(291 /* JSDocClassTag */, atToken.pos);
                     tag.atToken = atToken;
                     tag.tagName = tagName;
                     return finishNode(tag);
@@ -16732,7 +20986,7 @@ var ts;
                 function parseTypedefTag(atToken, tagName, indent) {
                     var typeExpression = tryParseTypeExpression();
                     skipWhitespace();
-                    var typedefTag = createNode(297, atToken.pos);
+                    var typedefTag = createNode(297 /* JSDocTypedefTag */, atToken.pos);
                     typedefTag.atToken = atToken;
                     typedefTag.tagName = tagName;
                     typedefTag.fullName = parseJSDocTypeNameWithNamespace();
@@ -16748,9 +21002,9 @@ var ts;
                         var start_3 = scanner.getStartPos();
                         while (child = tryParse(function () { return parseChildPropertyTag(); })) {
                             if (!jsdocTypeLiteral) {
-                                jsdocTypeLiteral = createNode(287, start_3);
+                                jsdocTypeLiteral = createNode(287 /* JSDocTypeLiteral */, start_3);
                             }
-                            if (child.kind === 295) {
+                            if (child.kind === 295 /* JSDocTypeTag */) {
                                 if (childTypeTag) {
                                     break;
                                 }
@@ -16763,7 +21017,7 @@ var ts;
                             }
                         }
                         if (jsdocTypeLiteral) {
-                            if (typeExpression && typeExpression.type.kind === 167) {
+                            if (typeExpression && typeExpression.type.kind === 167 /* ArrayType */) {
                                 jsdocTypeLiteral.isArrayType = true;
                             }
                             typedefTag.typeExpression = childTypeTag && childTypeTag.typeExpression && !isObjectOrObjectArrayTypeReference(childTypeTag.typeExpression.type) ?
@@ -16772,27 +21026,31 @@ var ts;
                             end = typedefTag.typeExpression.end;
                         }
                     }
+                    // Only include the characters between the name end and the next token if a comment was actually parsed out - otherwise it's just whitespace
                     return finishNode(typedefTag, end || typedefTag.comment !== undefined ? scanner.getStartPos() : (typedefTag.fullName || typedefTag.typeExpression || typedefTag.tagName).end);
                 }
                 function parseJSDocTypeNameWithNamespace(nested) {
                     var pos = scanner.getTokenPos();
+                    if (!ts.tokenIsIdentifierOrKeyword(token())) {
+                        return undefined;
+                    }
                     var typeNameOrNamespaceName = parseJSDocIdentifierName();
-                    if (typeNameOrNamespaceName && parseOptional(23)) {
-                        var jsDocNamespaceNode = createNode(239, pos);
+                    if (parseOptional(23 /* DotToken */)) {
+                        var jsDocNamespaceNode = createNode(239 /* ModuleDeclaration */, pos);
                         if (nested) {
-                            jsDocNamespaceNode.flags |= 4;
+                            jsDocNamespaceNode.flags |= 4 /* NestedNamespace */;
                         }
                         jsDocNamespaceNode.name = typeNameOrNamespaceName;
-                        jsDocNamespaceNode.body = parseJSDocTypeNameWithNamespace(true);
+                        jsDocNamespaceNode.body = parseJSDocTypeNameWithNamespace(/*nested*/ true);
                         return finishNode(jsDocNamespaceNode);
                     }
-                    if (typeNameOrNamespaceName && nested) {
+                    if (nested) {
                         typeNameOrNamespaceName.isInJSDocNamespace = true;
                     }
                     return typeNameOrNamespaceName;
                 }
                 function parseCallbackTag(atToken, tagName, indent) {
-                    var callbackTag = createNode(292, atToken.pos);
+                    var callbackTag = createNode(292 /* JSDocCallbackTag */, atToken.pos);
                     callbackTag.atToken = atToken;
                     callbackTag.tagName = tagName;
                     callbackTag.fullName = parseJSDocTypeNameWithNamespace();
@@ -16801,15 +21059,15 @@ var ts;
                     callbackTag.comment = parseTagComments(indent);
                     var child;
                     var start = scanner.getStartPos();
-                    var jsdocSignature = createNode(288, start);
+                    var jsdocSignature = createNode(288 /* JSDocSignature */, start);
                     jsdocSignature.parameters = [];
-                    while (child = tryParse(function () { return parseChildParameterOrPropertyTag(4); })) {
+                    while (child = tryParse(function () { return parseChildParameterOrPropertyTag(4 /* CallbackParameter */); })) {
                         jsdocSignature.parameters = ts.append(jsdocSignature.parameters, child);
                     }
                     var returnTag = tryParse(function () {
-                        if (parseOptionalJsdoc(57)) {
+                        if (parseOptionalJsdoc(57 /* AtToken */)) {
                             var tag = parseTag(indent);
-                            if (tag && tag.kind === 294) {
+                            if (tag && tag.kind === 294 /* JSDocReturnTag */) {
                                 return tag;
                             }
                         }
@@ -16844,65 +21102,62 @@ var ts;
                     return a.escapedText === b.escapedText;
                 }
                 function parseChildPropertyTag() {
-                    return parseChildParameterOrPropertyTag(1);
+                    return parseChildParameterOrPropertyTag(1 /* Property */);
                 }
                 function parseChildParameterOrPropertyTag(target, name) {
                     var canParseTag = true;
                     var seenAsterisk = false;
                     while (true) {
                         switch (nextJSDocToken()) {
-                            case 57:
+                            case 57 /* AtToken */:
                                 if (canParseTag) {
                                     var child = tryParseChildTag(target);
-                                    if (child && child.kind === 293 &&
-                                        target !== 4 &&
-                                        (ts.isIdentifier(child.name) || !escapedTextsEqual(name, child.name.left))) {
+                                    if (child && child.kind === 293 /* JSDocParameterTag */ &&
+                                        target !== 4 /* CallbackParameter */ &&
+                                        (ts.isIdentifier(child.name) || !escapedTextsEqual(name, child.name.left))) { // TODO: GH#18217
                                         return false;
                                     }
                                     return child;
                                 }
                                 seenAsterisk = false;
                                 break;
-                            case 4:
+                            case 4 /* NewLineTrivia */:
                                 canParseTag = true;
                                 seenAsterisk = false;
                                 break;
-                            case 39:
+                            case 39 /* AsteriskToken */:
                                 if (seenAsterisk) {
                                     canParseTag = false;
                                 }
                                 seenAsterisk = true;
                                 break;
-                            case 71:
+                            case 71 /* Identifier */:
                                 canParseTag = false;
                                 break;
-                            case 1:
+                            case 1 /* EndOfFileToken */:
                                 return false;
                         }
                     }
                 }
                 function tryParseChildTag(target) {
-                    ts.Debug.assert(token() === 57);
-                    var atToken = createNode(57);
+                    ts.Debug.assert(token() === 57 /* AtToken */);
+                    var atToken = createNode(57 /* AtToken */);
                     atToken.end = scanner.getTextPos();
                     nextJSDocToken();
                     var tagName = parseJSDocIdentifierName();
                     skipWhitespace();
-                    if (!tagName) {
-                        return false;
-                    }
                     var t;
                     switch (tagName.escapedText) {
                         case "type":
-                            return target === 1 && parseTypeTag(atToken, tagName);
+                            return target === 1 /* Property */ && parseTypeTag(atToken, tagName);
                         case "prop":
                         case "property":
-                            t = 1;
+                            t = 1 /* Property */;
                             break;
                         case "arg":
                         case "argument":
                         case "param":
-                            t = 2 | 4;
+                            t = 2 /* Parameter */ | 4 /* CallbackParameter */;
                             break;
                         default:
                             return false;
@@ -16910,33 +21165,30 @@ var ts;
                     if (!(target & t)) {
                         return false;
                     }
-                    var tag = parseParameterOrPropertyTag(atToken, tagName, target, undefined);
+                    var tag = parseParameterOrPropertyTag(atToken, tagName, target, /*indent*/ undefined);
                     tag.comment = parseTagComments(tag.end - tag.pos);
                     return tag;
                 }
                 function parseTemplateTag(atToken, tagName) {
+                    // the template tag looks like '@template {Constraint} T,U,V'
                     var constraint;
-                    if (token() === 17) {
+                    if (token() === 17 /* OpenBraceToken */) {
                         constraint = parseJSDocTypeExpression();
                     }
                     var typeParameters = [];
                     var typeParametersPos = getNodePos();
                     do {
                         skipWhitespace();
-                        var typeParameter = createNode(148);
-                        if (!ts.tokenIsIdentifierOrKeyword(token())) {
-                            parseErrorAtCurrentToken(ts.Diagnostics.Unexpected_token_A_type_parameter_name_was_expected_without_curly_braces);
-                            return undefined;
-                        }
-                        typeParameter.name = parseJSDocIdentifierName();
+                        var typeParameter = createNode(148 /* TypeParameter */);
+                        typeParameter.name = parseJSDocIdentifierName(ts.Diagnostics.Unexpected_token_A_type_parameter_name_was_expected_without_curly_braces);
                         skipWhitespace();
                         finishNode(typeParameter);
                         typeParameters.push(typeParameter);
-                    } while (parseOptionalJsdoc(26));
+                    } while (parseOptionalJsdoc(26 /* CommaToken */));
                     if (constraint) {
                         ts.first(typeParameters).constraint = constraint.type;
                     }
-                    var result = createNode(296, atToken.pos);
+                    var result = createNode(296 /* JSDocTemplateTag */, atToken.pos);
                     result.atToken = atToken;
                     result.tagName = tagName;
                     result.typeParameters = createNodeArray(typeParameters, typeParametersPos);
@@ -16954,33 +21206,29 @@ var ts;
                     return false;
                 }
                 function parseJSDocEntityName() {
-                    var entity = parseJSDocIdentifierName(true);
-                    if (parseOptional(21)) {
-                        parseExpected(22);
+                    var entity = parseJSDocIdentifierName();
+                    if (parseOptional(21 /* OpenBracketToken */)) {
+                        parseExpected(22 /* CloseBracketToken */);
+                        // Note that y[] is accepted as an entity name, but the postfix brackets are not saved for checking.
+                        // Technically usejsdoc.org requires them for specifying a property of a type equivalent to Array<{ x: ...}>
+                        // but it's not worth it to enforce that restriction.
                     }
-                    while (parseOptional(23)) {
-                        var name = parseJSDocIdentifierName(true);
-                        if (parseOptional(21)) {
-                            parseExpected(22);
+                    while (parseOptional(23 /* DotToken */)) {
+                        var name = parseJSDocIdentifierName();
+                        if (parseOptional(21 /* OpenBracketToken */)) {
+                            parseExpected(22 /* CloseBracketToken */);
                         }
                         entity = createQualifiedName(entity, name);
                     }
                     return entity;
                 }
-                function parseJSDocIdentifierName(createIfMissing) {
-                    if (createIfMissing === void 0) { createIfMissing = false; }
+                function parseJSDocIdentifierName(message) {
                     if (!ts.tokenIsIdentifierOrKeyword(token())) {
-                        if (createIfMissing) {
-                            return createMissingNode(71, true, ts.Diagnostics.Identifier_expected);
-                        }
-                        else {
-                            parseErrorAtCurrentToken(ts.Diagnostics.Identifier_expected);
-                            return undefined;
-                        }
+                        return createMissingNode(71 /* Identifier */, /*reportAtCurrentPosition*/ !message, message || ts.Diagnostics.Identifier_expected);
                     }
                     var pos = scanner.getTokenPos();
                     var end = scanner.getTextPos();
-                    var result = createNode(71, pos);
+                    var result = createNode(71 /* Identifier */, pos);
                     result.escapedText = ts.escapeLeadingUnderscores(scanner.getTokenText());
                     finishNode(result, end);
                     nextJSDocToken();
@@ -16993,27 +21241,72 @@ var ts;
     var IncrementalParser;
     (function (IncrementalParser) {
         function updateSourceFile(sourceFile, newText, textChangeRange, aggressiveChecks) {
-            aggressiveChecks = aggressiveChecks || ts.Debug.shouldAssert(2);
+            aggressiveChecks = aggressiveChecks || ts.Debug.shouldAssert(2 /* Aggressive */);
             checkChangeRange(sourceFile, newText, textChangeRange, aggressiveChecks);
             if (ts.textChangeRangeIsUnchanged(textChangeRange)) {
+                // if the text didn't change, then we can just return our current source file as-is.
                 return sourceFile;
             }
             if (sourceFile.statements.length === 0) {
-                return Parser.parseSourceFile(sourceFile.fileName, newText, sourceFile.languageVersion, undefined, true, sourceFile.scriptKind);
+                // If we don't have any statements in the current source file, then there's no real
+                // way to incrementally parse.  So just do a full parse instead.
+                return Parser.parseSourceFile(sourceFile.fileName, newText, sourceFile.languageVersion, /*syntaxCursor*/ undefined, /*setParentNodes*/ true, sourceFile.scriptKind);
             }
+            // Make sure we're not trying to incrementally update a source file more than once.  Once
+            // we do an update the original source file is considered unusable from that point onwards.
+            //
+            // This is because we do incremental parsing in-place.  i.e. we take nodes from the old
+            // tree and give them new positions and parents.  From that point on, trusting the old
+            // tree at all is not possible as far too much of it may violate invariants.
             var incrementalSourceFile = sourceFile;
             ts.Debug.assert(!incrementalSourceFile.hasBeenIncrementallyParsed);
             incrementalSourceFile.hasBeenIncrementallyParsed = true;
             var oldText = sourceFile.text;
             var syntaxCursor = createSyntaxCursor(sourceFile);
+            // Make the actual change larger so that we know to reparse anything whose lookahead
+            // might have intersected the change.
             var changeRange = extendToAffectedRange(sourceFile, textChangeRange);
             checkChangeRange(sourceFile, newText, changeRange, aggressiveChecks);
+            // Ensure that extending the affected range only moved the start of the change range
+            // earlier in the file.
             ts.Debug.assert(changeRange.span.start <= textChangeRange.span.start);
             ts.Debug.assert(ts.textSpanEnd(changeRange.span) === ts.textSpanEnd(textChangeRange.span));
             ts.Debug.assert(ts.textSpanEnd(ts.textChangeRangeNewSpan(changeRange)) === ts.textSpanEnd(ts.textChangeRangeNewSpan(textChangeRange)));
+            // The is the amount the nodes after the edit range need to be adjusted.  It can be
+            // positive (if the edit added characters), negative (if the edit deleted characters)
+            // or zero (if this was a pure overwrite with nothing added/removed).
             var delta = ts.textChangeRangeNewSpan(changeRange).length - changeRange.span.length;
+            // If we added or removed characters during the edit, then we need to go and adjust all
+            // the nodes after the edit.  Those nodes may move forward (if we inserted chars) or they
+            // may move backward (if we deleted chars).
+            //
+            // Doing this helps us out in two ways.  First, it means that any nodes/tokens we want
+            // to reuse are already at the appropriate position in the new text.  That way when we
+            // reuse them, we don't have to figure out if they need to be adjusted.  Second, it makes
+            // it very easy to determine if we can reuse a node.  If the node's position is at where
+            // we are in the text, then we can reuse it.  Otherwise we can't.  If the node's position
+            // is ahead of us, then we'll need to rescan tokens.  If the node's position is behind
+            // us, then we'll need to skip it or crumble it as appropriate
+            //
+            // We will also adjust the positions of nodes that intersect the change range as well.
+            // By doing this, we ensure that all the positions in the old tree are consistent, not
+            // just the positions of nodes entirely before/after the change range.  By being
+            // consistent, we can then easily map from positions to nodes in the old tree easily.
+            //
+            // Also, mark any syntax elements that intersect the changed span.  We know, up front,
+            // that we cannot reuse these elements.
             updateTokenPositionsAndMarkElements(incrementalSourceFile, changeRange.span.start, ts.textSpanEnd(changeRange.span), ts.textSpanEnd(ts.textChangeRangeNewSpan(changeRange)), delta, oldText, newText, aggressiveChecks);
-            var result = Parser.parseSourceFile(sourceFile.fileName, newText, sourceFile.languageVersion, syntaxCursor, true, sourceFile.scriptKind);
+            // Now that we've set up our internal incremental state just proceed and parse the
+            // source file in the normal fashion.  When possible the parser will retrieve and
+            // reuse nodes from the old tree.
+            //
+            // Note: passing in 'true' for setNodeParents is very important.  When incrementally
+            // parsing, we will be reusing nodes from the old tree, and placing it into new
+            // parents.  If we don't set the parents now, we'll end up with an observably
+            // inconsistent tree.  Setting the parents on the new tree should be very fast.  We
+            // will immediately bail out of walking any subtrees when we can see that their parents
+            // are already correct.
+            var result = Parser.parseSourceFile(sourceFile.fileName, newText, sourceFile.languageVersion, syntaxCursor, /*setParentNodes*/ true, sourceFile.scriptKind);
             return result;
         }
         IncrementalParser.updateSourceFile = updateSourceFile;
@@ -17030,6 +21323,8 @@ var ts;
                 if (aggressiveChecks && shouldCheckNode(node)) {
                     text = oldText.substring(node.pos, node.end);
                 }
+                // Ditch any existing LS children we may have created.  This way we can avoid
+                // moving them forward.
                 if (node._children) {
                     node._children = undefined;
                 }
@@ -17051,17 +21346,17 @@ var ts;
                 array._children = undefined;
                 array.pos += delta;
                 array.end += delta;
-                for (var _i = 0, array_8 = array; _i < array_8.length; _i++) {
-                    var node = array_8[_i];
+                for (var _i = 0, array_1 = array; _i < array_1.length; _i++) {
+                    var node = array_1[_i];
                     visitNode(node);
                 }
             }
         }
         function shouldCheckNode(node) {
             switch (node.kind) {
-                case 9:
-                case 8:
-                case 71:
+                case 9 /* StringLiteral */:
+                case 8 /* NumericLiteral */:
+                case 71 /* Identifier */:
                     return true;
             }
             return false;
@@ -17070,11 +21365,63 @@ var ts;
             ts.Debug.assert(element.end >= changeStart, "Adjusting an element that was entirely before the change range");
             ts.Debug.assert(element.pos <= changeRangeOldEnd, "Adjusting an element that was entirely after the change range");
             ts.Debug.assert(element.pos <= element.end);
+            // We have an element that intersects the change range in some way.  It may have its
+            // start, or its end (or both) in the changed range.  We want to adjust any part
+            // that intersects such that the final tree is in a consistent state.  i.e. all
+            // children have spans within the span of their parent, and all siblings are ordered
+            // properly.
+            // We may need to update both the 'pos' and the 'end' of the element.
+            // If the 'pos' is before the start of the change, then we don't need to touch it.
+            // If it isn't, then the 'pos' must be inside the change.  How we update it will
+            // depend if delta is positive or negative. If delta is positive then we have
+            // something like:
+            //
+            //  -------------------AAA-----------------
+            //  -------------------BBBCCCCCCC-----------------
+            //
+            // In this case, we consider any node that started in the change range to still be
+            // starting at the same position.
+            //
+            // however, if the delta is negative, then we instead have something like this:
+            //
+            //  -------------------XXXYYYYYYY-----------------
+            //  -------------------ZZZ-----------------
+            //
+            // In this case, any element that started in the 'X' range will keep its position.
+            // However any element that started after that will have their pos adjusted to be
+            // at the end of the new range.  i.e. any node that started in the 'Y' range will
+            // be adjusted to have their start at the end of the 'Z' range.
+            //
+            // The element will keep its position if possible.  Or Move backward to the new-end
+            // if it's in the 'Y' range.
             element.pos = Math.min(element.pos, changeRangeNewEnd);
+            // If the 'end' is after the change range, then we always adjust it by the delta
+            // amount.  However, if the end is in the change range, then how we adjust it
+            // will depend on if delta is positive or negative.  If delta is positive then we
+            // have something like:
+            //
+            //  -------------------AAA-----------------
+            //  -------------------BBBCCCCCCC-----------------
+            //
+            // In this case, we consider any node that ended inside the change range to keep its
+            // end position.
+            //
+            // however, if the delta is negative, then we instead have something like this:
+            //
+            //  -------------------XXXYYYYYYY-----------------
+            //  -------------------ZZZ-----------------
+            //
+            // In this case, any element that ended in the 'X' range will keep its position.
+            // However any element that ended after that will have their pos adjusted to be
+            // at the end of the new range.  i.e. any node that ended in the 'Y' range will
+            // be adjusted to have their end at the end of the 'Z' range.
             if (element.end >= changeRangeOldEnd) {
+                // Element ends after the change range.  Always adjust the end pos.
                 element.end += delta;
             }
             else {
+                // Element ends in the change range.  The element will keep its position if
+                // possible. Or Move backward to the new-end if it's in the 'Y' range.
                 element.end = Math.min(element.end, changeRangeNewEnd);
             }
             ts.Debug.assert(element.pos <= element.end);
@@ -17106,13 +21453,19 @@ var ts;
             function visitNode(child) {
                 ts.Debug.assert(child.pos <= child.end);
                 if (child.pos > changeRangeOldEnd) {
-                    moveElementEntirelyPastChangeRange(child, false, delta, oldText, newText, aggressiveChecks);
+                    // Node is entirely past the change range.  We need to move both its pos and
+                    // end, forward or backward appropriately.
+                    moveElementEntirelyPastChangeRange(child, /*isArray*/ false, delta, oldText, newText, aggressiveChecks);
                     return;
                 }
+                // Check if the element intersects the change range.  If it does, then it is not
+                // reusable.  Also, we'll need to recurse to see what constituent portions we may
+                // be able to use.
                 var fullEnd = child.end;
                 if (fullEnd >= changeStart) {
                     child.intersectsChange = true;
                     child._children = undefined;
+                    // Adjust the pos or end (or both) of the intersecting element accordingly.
                     adjustIntersectingElement(child, changeStart, changeRangeOldEnd, changeRangeNewEnd, delta);
                     forEachChild(child, visitNode, visitArray);
                     if (ts.hasJSDocNodes(child)) {
@@ -17124,31 +21477,52 @@ var ts;
                     checkNodePositions(child, aggressiveChecks);
                     return;
                 }
+                // Otherwise, the node is entirely before the change range.  No need to do anything with it.
                 ts.Debug.assert(fullEnd < changeStart);
             }
             function visitArray(array) {
                 ts.Debug.assert(array.pos <= array.end);
                 if (array.pos > changeRangeOldEnd) {
-                    moveElementEntirelyPastChangeRange(array, true, delta, oldText, newText, aggressiveChecks);
+                    // Array is entirely after the change range.  We need to move it, and move any of
+                    // its children.
+                    moveElementEntirelyPastChangeRange(array, /*isArray*/ true, delta, oldText, newText, aggressiveChecks);
                     return;
                 }
+                // Check if the element intersects the change range.  If it does, then it is not
+                // reusable.  Also, we'll need to recurse to see what constituent portions we may
+                // be able to use.
                 var fullEnd = array.end;
                 if (fullEnd >= changeStart) {
                     array.intersectsChange = true;
                     array._children = undefined;
+                    // Adjust the pos or end (or both) of the intersecting array accordingly.
                     adjustIntersectingElement(array, changeStart, changeRangeOldEnd, changeRangeNewEnd, delta);
-                    for (var _i = 0, array_9 = array; _i < array_9.length; _i++) {
-                        var node = array_9[_i];
+                    for (var _i = 0, array_2 = array; _i < array_2.length; _i++) {
+                        var node = array_2[_i];
                         visitNode(node);
                     }
                     return;
                 }
+                // Otherwise, the array is entirely before the change range.  No need to do anything with it.
                 ts.Debug.assert(fullEnd < changeStart);
             }
         }
         function extendToAffectedRange(sourceFile, changeRange) {
+            // Consider the following code:
+            //      void foo() { /; }
+            //
+            // If the text changes with an insertion of / just before the semicolon then we end up with:
+            //      void foo() { //; }
+            //
+            // If we were to just use the changeRange a is, then we would not rescan the { token
+            // (as it does not intersect the actual original change range).  Because an edit may
+            // change the token touching it, we actually need to look back *at least* one token so
+            // that the prior token sees that change.
             var maxLookahead = 1;
             var start = changeRange.span.start;
+            // the first iteration aligns us with the change start. subsequent iteration move us to
+            // the left by maxLookahead tokens.  We only need to do this as long as we're not at the
+            // start of the tree.
             for (var i = 0; start > 0 && i <= maxLookahead; i++) {
                 var nearestNode = findNearestNodeStartingBeforeOrAtPosition(sourceFile, start);
                 ts.Debug.assert(nearestNode.pos <= start);
@@ -17183,23 +21557,54 @@ var ts;
             }
             function visit(child) {
                 if (ts.nodeIsMissing(child)) {
+                    // Missing nodes are effectively invisible to us.  We never even consider them
+                    // When trying to find the nearest node before us.
                     return;
                 }
+                // If the child intersects this position, then this node is currently the nearest
+                // node that starts before the position.
                 if (child.pos <= position) {
                     if (child.pos >= bestResult.pos) {
+                        // This node starts before the position, and is closer to the position than
+                        // the previous best node we found.  It is now the new best node.
                         bestResult = child;
                     }
+                    // Now, the node may overlap the position, or it may end entirely before the
+                    // position.  If it overlaps with the position, then either it, or one of its
+                    // children must be the nearest node before the position.  So we can just
+                    // recurse into this child to see if we can find something better.
                     if (position < child.end) {
+                        // The nearest node is either this child, or one of the children inside
+                        // of it.  We've already marked this child as the best so far.  Recurse
+                        // in case one of the children is better.
                         forEachChild(child, visit);
+                        // Once we look at the children of this node, then there's no need to
+                        // continue any further.
                         return true;
                     }
                     else {
                         ts.Debug.assert(child.end <= position);
+                        // The child ends entirely before this position.  Say you have the following
+                        // (where $ is the position)
+                        //
+                        //      <complex expr 1> ? <complex expr 2> $ : <...> <...>
+                        //
+                        // We would want to find the nearest preceding node in "complex expr 2".
+                        // To support that, we keep track of this node, and once we're done searching
+                        // for a best node, we recurse down this node to see if we can find a good
+                        // result in it.
+                        //
+                        // This approach allows us to quickly skip over nodes that are entirely
+                        // before the position, while still allowing us to find any nodes in the
+                        // last one that might be what we want.
                         lastNodeEntirelyBeforePosition = child;
                     }
                 }
                 else {
                     ts.Debug.assert(child.pos > position);
+                    // We're now at a node that is entirely past the position we're searching for.
+                    // This node (and all following nodes) could never contribute to the result,
+                    // so just skip them by returning 'true' here.
                     return true;
                 }
             }
@@ -17208,7 +21613,7 @@ var ts;
             var oldText = sourceFile.text;
             if (textChangeRange) {
                 ts.Debug.assert((oldText.length - textChangeRange.span.length + textChangeRange.newLength) === newText.length);
-                if (aggressiveChecks || ts.Debug.shouldAssert(3)) {
+                if (aggressiveChecks || ts.Debug.shouldAssert(3 /* VeryAggressive */)) {
                     var oldTextPrefix = oldText.substr(0, textChangeRange.span.start);
                     var newTextPrefix = newText.substr(0, textChangeRange.span.start);
                     ts.Debug.assert(oldTextPrefix === newTextPrefix);
@@ -17223,42 +21628,68 @@ var ts;
             var currentArrayIndex = 0;
             ts.Debug.assert(currentArrayIndex < currentArray.length);
             var current = currentArray[currentArrayIndex];
-            var lastQueriedPosition = -1;
+            var lastQueriedPosition = -1 /* Value */;
             return {
                 currentNode: function (position) {
+                    // Only compute the current node if the position is different than the last time
+                    // we were asked.  The parser commonly asks for the node at the same position
+                    // twice.  Once to know if can read an appropriate list element at a certain point,
+                    // and then to actually read and consume the node.
                     if (position !== lastQueriedPosition) {
+                        // Much of the time the parser will need the very next node in the array that
+                        // we just returned a node from.So just simply check for that case and move
+                        // forward in the array instead of searching for the node again.
                         if (current && current.end === position && currentArrayIndex < (currentArray.length - 1)) {
                             currentArrayIndex++;
                             current = currentArray[currentArrayIndex];
                         }
+                        // If we don't have a node, or the node we have isn't in the right position,
+                        // then try to find a viable node at the position requested.
                         if (!current || current.pos !== position) {
                             findHighestListElementThatStartsAtPosition(position);
                         }
                     }
+                    // Cache this query so that we don't do any extra work if the parser calls back
+                    // into us.  Note: this is very common as the parser will make pairs of calls like
+                    // 'isListElement -> parseListElement'.  If we were unable to find a node when
+                    // called with 'isListElement', we don't want to redo the work when parseListElement
+                    // is called immediately after.
                     lastQueriedPosition = position;
+                    // Either we don'd have a node, or we have a node at the position being asked for.
                     ts.Debug.assert(!current || current.pos === position);
                     return current;
                 }
             };
+            // Finds the highest element in the tree we can find that starts at the provided position.
+            // The element must be a direct child of some node list in the tree.  This way after we
+            // return it, we can easily return its next sibling in the list.
             function findHighestListElementThatStartsAtPosition(position) {
+                // Clear out any cached state about the last node we found.
                 currentArray = undefined;
-                currentArrayIndex = -1;
+                currentArrayIndex = -1 /* Value */;
                 current = undefined;
+                // Recurse into the source file to find the highest node at this position.
                 forEachChild(sourceFile, visitNode, visitArray);
                 return;
                 function visitNode(node) {
                     if (position >= node.pos && position < node.end) {
+                        // Position was within this node.  Keep searching deeper to find the node.
                         forEachChild(node, visitNode, visitArray);
+                        // don't proceed any further in the search.
                         return true;
                     }
+                    // position wasn't in this node, have to keep searching.
                     return false;
                 }
                 function visitArray(array) {
                     if (position >= array.pos && position < array.end) {
+                        // position was in this array.  Search through this array to see if we find a
+                        // viable element.
                         for (var i = 0; i < array.length; i++) {
                             var child = array[i];
                             if (child) {
                                 if (child.pos === position) {
+                                    // Found the right node.  We're done.
                                     currentArray = array;
                                     currentArrayIndex = i;
                                     current = child;
@@ -17266,6 +21697,8 @@ var ts;
                                 }
                                 else {
                                     if (child.pos < position && position < child.end) {
+                                        // Position in somewhere within this child.  Search in it and
+                                        // stop searching in this array.
                                         forEachChild(child, visitNode, visitArray);
                                         return true;
                                     }
@@ -17273,17 +21706,26 @@ var ts;
                             }
                         }
                     }
+                    // position wasn't in this array, have to keep searching.
                     return false;
                 }
             }
         }
+        var InvalidPosition;
+        (function (InvalidPosition) {
+            InvalidPosition[InvalidPosition["Value"] = -1] = "Value";
+        })(InvalidPosition || (InvalidPosition = {}));
     })(IncrementalParser || (IncrementalParser = {}));
     function isDeclarationFileName(fileName) {
-        return ts.fileExtensionIs(fileName, ".d.ts");
+        return ts.fileExtensionIs(fileName, ".d.ts" /* Dts */);
     }
+    /*@internal*/
     function processCommentPragmas(context, sourceText) {
-        var triviaScanner = ts.createScanner(context.languageVersion, false, 0, sourceText);
+        var triviaScanner = ts.createScanner(context.languageVersion, /*skipTrivia*/ false, 0 /* Standard */, sourceText);
         var pragmas = [];
+        // Keep scanning all the leading trivia in the file until we get to something that
+        // isn't trivia.  Any single line comment will be analyzed to see if it is a
+        // reference comment.
         while (true) {
             var kind = triviaScanner.scan();
             if (!ts.isTrivia(kind)) {
@@ -17300,7 +21742,7 @@ var ts;
         context.pragmas = ts.createMap();
         for (var _i = 0, pragmas_1 = pragmas; _i < pragmas_1.length; _i++) {
             var pragma = pragmas_1[_i];
-            if (context.pragmas.has(pragma.name)) {
+            if (context.pragmas.has(pragma.name)) { // TODO: GH#18217
                 var currentValue = context.pragmas.get(pragma.name);
                 if (currentValue instanceof Array) {
                     currentValue.push(pragma.args);
@@ -17314,24 +21756,33 @@ var ts;
         }
     }
     ts.processCommentPragmas = processCommentPragmas;
+    /*@internal*/
     function processPragmasIntoFields(context, reportDiagnostic) {
         context.checkJsDirective = undefined;
         context.referencedFiles = [];
         context.typeReferenceDirectives = [];
+        context.libReferenceDirectives = [];
         context.amdDependencies = [];
         context.hasNoDefaultLib = false;
         context.pragmas.forEach(function (entryOrList, key) {
+            // TODO: The below should be strongly type-guarded and not need casts/explicit annotations, since entryOrList is related to
+            // key and key is constrained to a union; but it's not (see GH#21483 for at least partial fix) :(
             switch (key) {
                 case "reference": {
                     var referencedFiles_1 = context.referencedFiles;
                     var typeReferenceDirectives_1 = context.typeReferenceDirectives;
+                    var libReferenceDirectives_1 = context.libReferenceDirectives;
                     ts.forEach(ts.toArray(entryOrList), function (arg) {
+                        // TODO: GH#18217
                         if (arg.arguments["no-default-lib"]) {
                             context.hasNoDefaultLib = true;
                         }
                         else if (arg.arguments.types) {
                             typeReferenceDirectives_1.push({ pos: arg.arguments.types.pos, end: arg.arguments.types.end, fileName: arg.arguments.types.value });
                         }
+                        else if (arg.arguments.lib) {
+                            libReferenceDirectives_1.push({ pos: arg.arguments.lib.pos, end: arg.arguments.lib.end, fileName: arg.arguments.lib.value });
+                        }
                         else if (arg.arguments.path) {
                             referencedFiles_1.push({ pos: arg.arguments.path.pos, end: arg.arguments.path.end, fileName: arg.arguments.path.value });
                         }
@@ -17342,7 +21793,7 @@ var ts;
                     break;
                 }
                 case "amd-dependency": {
-                    context.amdDependencies = ts.map(ts.toArray(entryOrList), function (x) { return ({ name: x.arguments.name, path: x.arguments.path }); });
+                    context.amdDependencies = ts.map(ts.toArray(entryOrList), function (x) { return ({ name: x.arguments.name, path: x.arguments.path }); }); // TODO: GH#18217
                     break;
                 }
                 case "amd-module": {
@@ -17350,6 +21801,7 @@ var ts;
                         for (var _i = 0, entryOrList_1 = entryOrList; _i < entryOrList_1.length; _i++) {
                             var entry = entryOrList_1[_i];
                             if (context.moduleName) {
+                                // TODO: It's probably fine to issue this diagnostic on all instances of the pragma
                                 reportDiagnostic(entry.range.pos, entry.range.end - entry.range.pos, ts.Diagnostics.An_AMD_module_cannot_have_multiple_name_assignments);
                             }
                             context.moduleName = entry.arguments.name;
@@ -17362,8 +21814,9 @@ var ts;
                 }
                 case "ts-nocheck":
                 case "ts-check": {
+                    // _last_ of either nocheck or check in a file is the "winner"
                     ts.forEach(ts.toArray(entryOrList), function (entry) {
-                        if (!context.checkJsDirective || entry.range.pos > context.checkJsDirective.pos) {
+                        if (!context.checkJsDirective || entry.range.pos > context.checkJsDirective.pos) { // TODO: GH#18217
                             context.checkJsDirective = {
                                 enabled: key === "ts-check",
                                 end: entry.range.end,
@@ -17373,8 +21826,8 @@ var ts;
                     });
                     break;
                 }
-                case "jsx": return;
-                default: ts.Debug.fail("Unhandled pragma kind");
+                case "jsx": return; // Accessed directly
+                default: ts.Debug.fail("Unhandled pragma kind"); // Can this be made into an assertNever in the future?
             }
         });
     }
@@ -17391,11 +21844,11 @@ var ts;
     var tripleSlashXMLCommentStartRegEx = /^\/\/\/\s*<(\S+)\s.*?\/>/im;
     var singleLinePragmaRegEx = /^\/\/\/?\s*@(\S+)\s*(.*)\s*$/im;
     function extractPragmas(pragmas, range, text) {
-        var tripleSlash = range.kind === 2 && tripleSlashXMLCommentStartRegEx.exec(text);
+        var tripleSlash = range.kind === 2 /* SingleLineCommentTrivia */ && tripleSlashXMLCommentStartRegEx.exec(text);
         if (tripleSlash) {
-            var name = tripleSlash[1].toLowerCase();
+            var name = tripleSlash[1].toLowerCase(); // Technically unsafe cast, but we do it so the below check to make it safe typechecks
             var pragma = ts.commentPragmas[name];
-            if (!pragma || !(pragma.kind & 1)) {
+            if (!pragma || !(pragma.kind & 1 /* TripleSlashXML */)) {
                 return;
             }
             if (pragma.args) {
@@ -17405,7 +21858,7 @@ var ts;
                     var matcher = getNamedArgRegEx(arg.name);
                     var matchResult = matcher.exec(text);
                     if (!matchResult && !arg.optional) {
-                        return;
+                        return; // Missing required argument, don't parse
                     }
                     else if (matchResult) {
                         if (arg.captureSpan) {
@@ -17428,30 +21881,30 @@ var ts;
             }
             return;
         }
-        var singleLine = range.kind === 2 && singleLinePragmaRegEx.exec(text);
+        var singleLine = range.kind === 2 /* SingleLineCommentTrivia */ && singleLinePragmaRegEx.exec(text);
         if (singleLine) {
-            return addPragmaForMatch(pragmas, range, 2, singleLine);
+            return addPragmaForMatch(pragmas, range, 2 /* SingleLine */, singleLine);
         }
-        if (range.kind === 3) {
-            var multiLinePragmaRegEx = /\s*@(\S+)\s*(.*)\s*$/gim;
+        if (range.kind === 3 /* MultiLineCommentTrivia */) {
+            var multiLinePragmaRegEx = /\s*@(\S+)\s*(.*)\s*$/gim; // Defined inline since it uses the "g" flag, which keeps a persistent index (for iterating)
             var multiLineMatch = void 0;
             while (multiLineMatch = multiLinePragmaRegEx.exec(text)) {
-                addPragmaForMatch(pragmas, range, 4, multiLineMatch);
+                addPragmaForMatch(pragmas, range, 4 /* MultiLine */, multiLineMatch);
             }
         }
     }
     function addPragmaForMatch(pragmas, range, kind, match) {
         if (!match)
             return;
-        var name = match[1].toLowerCase();
+        var name = match[1].toLowerCase(); // Technically unsafe cast, but we do it so they below check to make it safe typechecks
         var pragma = ts.commentPragmas[name];
         if (!pragma || !(pragma.kind & kind)) {
             return;
         }
-        var args = match[2];
+        var args = match[2]; // Split on spaces and match up positionally with definition
         var argument = getNamedPragmaArguments(pragma, args);
         if (argument === "fail")
-            return;
+            return; // Missing required argument, fail to parse it
         pragmas.push({ name: name, args: { arguments: argument, range: range } });
         return;
     }
@@ -17474,16 +21927,20 @@ var ts;
         }
         return argMap;
     }
+    /** @internal */
     function tagNamesAreEquivalent(lhs, rhs) {
         if (lhs.kind !== rhs.kind) {
             return false;
         }
-        if (lhs.kind === 71) {
+        if (lhs.kind === 71 /* Identifier */) {
             return lhs.escapedText === rhs.escapedText;
         }
-        if (lhs.kind === 99) {
+        if (lhs.kind === 99 /* ThisKeyword */) {
             return true;
         }
+        // If we are at this statement then we must have PropertyAccessExpression and because tag name in Jsx element can only
+        // take forms of JsxTagNameExpression which includes an identifier, "this" expression, or another propertyAccessExpression
+        // it is safe to case the expression property as such. See parseJsxElementName for how we parse tag name in Jsx element
         return lhs.name.escapedText === rhs.name.escapedText &&
             tagNamesAreEquivalent(lhs.expression, rhs.expression);
     }
@@ -17491,3017 +21948,2271 @@ var ts;
 })(ts || (ts = {}));
 var ts;
 (function (ts) {
-    function getModuleInstanceState(node) {
-        return node.body ? getModuleInstanceStateWorker(node.body) : 1;
-    }
-    ts.getModuleInstanceState = getModuleInstanceState;
-    function getModuleInstanceStateWorker(node) {
-        switch (node.kind) {
-            case 236:
-            case 237:
-                return 0;
-            case 238:
-                if (ts.isConst(node)) {
-                    return 2;
-                }
-                break;
-            case 244:
-            case 243:
-                if (!(ts.hasModifier(node, 1))) {
-                    return 0;
-                }
-                break;
-            case 240: {
-                var state_1 = 0;
-                ts.forEachChild(node, function (n) {
-                    var childState = getModuleInstanceStateWorker(n);
-                    switch (childState) {
-                        case 0:
-                            return;
-                        case 2:
-                            state_1 = 2;
-                            return;
-                        case 1:
-                            state_1 = 1;
-                            return true;
-                        default:
-                            ts.Debug.assertNever(childState);
-                    }
-                });
-                return state_1;
-            }
-            case 239:
-                return getModuleInstanceState(node);
-            case 71:
-                if (node.isInJSDocNamespace) {
-                    return 0;
-                }
+    /* @internal */
+    ts.compileOnSaveCommandLineOption = { name: "compileOnSave", type: "boolean" };
+    // NOTE: The order here is important to default lib ordering as entries will have the same
+    //       order in the generated program (see `getDefaultLibPriority` in program.ts). This
+    //       order also affects overload resolution when a type declared in one lib is
+    //       augmented in another lib.
+    var libEntries = [
+        // JavaScript only
+        ["es5", "lib.es5.d.ts"],
+        ["es6", "lib.es2015.d.ts"],
+        ["es2015", "lib.es2015.d.ts"],
+        ["es7", "lib.es2016.d.ts"],
+        ["es2016", "lib.es2016.d.ts"],
+        ["es2017", "lib.es2017.d.ts"],
+        ["es2018", "lib.es2018.d.ts"],
+        ["esnext", "lib.esnext.d.ts"],
+        // Host only
+        ["dom", "lib.dom.d.ts"],
+        ["dom.iterable", "lib.dom.iterable.d.ts"],
+        ["webworker", "lib.webworker.d.ts"],
+        ["webworker.importscripts", "lib.webworker.importscripts.d.ts"],
+        ["scripthost", "lib.scripthost.d.ts"],
+        // ES2015 Or ESNext By-feature options
+        ["es2015.core", "lib.es2015.core.d.ts"],
+        ["es2015.collection", "lib.es2015.collection.d.ts"],
+        ["es2015.generator", "lib.es2015.generator.d.ts"],
+        ["es2015.iterable", "lib.es2015.iterable.d.ts"],
+        ["es2015.promise", "lib.es2015.promise.d.ts"],
+        ["es2015.proxy", "lib.es2015.proxy.d.ts"],
+        ["es2015.reflect", "lib.es2015.reflect.d.ts"],
+        ["es2015.symbol", "lib.es2015.symbol.d.ts"],
+        ["es2015.symbol.wellknown", "lib.es2015.symbol.wellknown.d.ts"],
+        ["es2016.array.include", "lib.es2016.array.include.d.ts"],
+        ["es2017.object", "lib.es2017.object.d.ts"],
+        ["es2017.sharedmemory", "lib.es2017.sharedmemory.d.ts"],
+        ["es2017.string", "lib.es2017.string.d.ts"],
+        ["es2017.intl", "lib.es2017.intl.d.ts"],
+        ["es2017.typedarrays", "lib.es2017.typedarrays.d.ts"],
+        ["es2018.intl", "lib.es2018.intl.d.ts"],
+        ["es2018.promise", "lib.es2018.promise.d.ts"],
+        ["es2018.regexp", "lib.es2018.regexp.d.ts"],
+        ["esnext.array", "lib.esnext.array.d.ts"],
+        ["esnext.symbol", "lib.esnext.symbol.d.ts"],
+        ["esnext.asynciterable", "lib.esnext.asynciterable.d.ts"],
+    ];
+    /**
+     * An array of supported "lib" reference file names used to determine the order for inclusion
+     * when referenced, as well as for spelling suggestions. This ensures the correct ordering for
+     * overload resolution when a type declared in one lib is extended by another.
+     */
+    /* @internal */
+    ts.libs = libEntries.map(function (entry) { return entry[0]; });
+    /**
+     * A map of lib names to lib files. This map is used both for parsing the "lib" command line
+     * option as well as for resolving lib reference directives.
+     */
+    /* @internal */
+    ts.libMap = ts.createMapFromEntries(libEntries);
+    /* @internal */
+    ts.optionDeclarations = [
+        // CommandLine only options
+        {
+            name: "help",
+            shortName: "h",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Command_line_Options,
+            description: ts.Diagnostics.Print_this_message,
+        },
+        {
+            name: "help",
+            shortName: "?",
+            type: "boolean"
+        },
+        {
+            name: "all",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Command_line_Options,
+            description: ts.Diagnostics.Show_all_compiler_options,
+        },
+        {
+            name: "version",
+            shortName: "v",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Command_line_Options,
+            description: ts.Diagnostics.Print_the_compiler_s_version,
+        },
+        {
+            name: "init",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Command_line_Options,
+            description: ts.Diagnostics.Initializes_a_TypeScript_project_and_creates_a_tsconfig_json_file,
+        },
+        {
+            name: "project",
+            shortName: "p",
+            type: "string",
+            isFilePath: true,
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Command_line_Options,
+            paramType: ts.Diagnostics.FILE_OR_DIRECTORY,
+            description: ts.Diagnostics.Compile_the_project_given_the_path_to_its_configuration_file_or_to_a_folder_with_a_tsconfig_json,
+        },
+        {
+            name: "build",
+            type: "boolean",
+            shortName: "b",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Command_line_Options,
+            description: ts.Diagnostics.Build_one_or_more_projects_and_their_dependencies_if_out_of_date
+        },
+        {
+            name: "pretty",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Command_line_Options,
+            description: ts.Diagnostics.Stylize_errors_and_messages_using_color_and_context_experimental
+        },
+        {
+            name: "preserveWatchOutput",
+            type: "boolean",
+            showInSimplifiedHelpView: false,
+            category: ts.Diagnostics.Command_line_Options,
+            description: ts.Diagnostics.Whether_to_keep_outdated_console_output_in_watch_mode_instead_of_clearing_the_screen,
+        },
+        {
+            name: "watch",
+            shortName: "w",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Command_line_Options,
+            description: ts.Diagnostics.Watch_input_files,
+        },
+        // Basic
+        {
+            name: "target",
+            shortName: "t",
+            type: ts.createMapFromTemplate({
+                es3: 0 /* ES3 */,
+                es5: 1 /* ES5 */,
+                es6: 2 /* ES2015 */,
+                es2015: 2 /* ES2015 */,
+                es2016: 3 /* ES2016 */,
+                es2017: 4 /* ES2017 */,
+                es2018: 5 /* ES2018 */,
+                esnext: 6 /* ESNext */,
+            }),
+            paramType: ts.Diagnostics.VERSION,
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Specify_ECMAScript_target_version_Colon_ES3_default_ES5_ES2015_ES2016_ES2017_ES2018_or_ESNEXT,
+        },
+        {
+            name: "module",
+            shortName: "m",
+            type: ts.createMapFromTemplate({
+                none: ts.ModuleKind.None,
+                commonjs: ts.ModuleKind.CommonJS,
+                amd: ts.ModuleKind.AMD,
+                system: ts.ModuleKind.System,
+                umd: ts.ModuleKind.UMD,
+                es6: ts.ModuleKind.ES2015,
+                es2015: ts.ModuleKind.ES2015,
+                esnext: ts.ModuleKind.ESNext
+            }),
+            paramType: ts.Diagnostics.KIND,
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Specify_module_code_generation_Colon_none_commonjs_amd_system_umd_es2015_or_ESNext,
+        },
+        {
+            name: "lib",
+            type: "list",
+            element: {
+                name: "lib",
+                type: ts.libMap
+            },
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Specify_library_files_to_be_included_in_the_compilation
+        },
+        {
+            name: "allowJs",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Allow_javascript_files_to_be_compiled
+        },
+        {
+            name: "checkJs",
+            type: "boolean",
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Report_errors_in_js_files
+        },
+        {
+            name: "jsx",
+            type: ts.createMapFromTemplate({
+                "preserve": 1 /* Preserve */,
+                "react-native": 3 /* ReactNative */,
+                "react": 2 /* React */
+            }),
+            paramType: ts.Diagnostics.KIND,
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Specify_JSX_code_generation_Colon_preserve_react_native_or_react,
+        },
+        {
+            name: "declaration",
+            shortName: "d",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Generates_corresponding_d_ts_file,
+        },
+        {
+            name: "declarationMap",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Generates_a_sourcemap_for_each_corresponding_d_ts_file,
+        },
+        {
+            name: "emitDeclarationOnly",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Only_emit_d_ts_declaration_files,
+        },
+        {
+            name: "sourceMap",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Generates_corresponding_map_file,
+        },
+        {
+            name: "outFile",
+            type: "string",
+            isFilePath: true,
+            paramType: ts.Diagnostics.FILE,
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Concatenate_and_emit_output_to_single_file,
+        },
+        {
+            name: "outDir",
+            type: "string",
+            isFilePath: true,
+            paramType: ts.Diagnostics.DIRECTORY,
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Redirect_output_structure_to_the_directory,
+        },
+        {
+            name: "rootDir",
+            type: "string",
+            isFilePath: true,
+            paramType: ts.Diagnostics.LOCATION,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Specify_the_root_directory_of_input_files_Use_to_control_the_output_directory_structure_with_outDir,
+        },
+        {
+            name: "composite",
+            type: "boolean",
+            isTSConfigOnly: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Enable_project_compilation,
+        },
+        {
+            name: "removeComments",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Do_not_emit_comments_to_output,
+        },
+        {
+            name: "noEmit",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Do_not_emit_outputs,
+        },
+        {
+            name: "importHelpers",
+            type: "boolean",
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Import_emit_helpers_from_tslib
+        },
+        {
+            name: "downlevelIteration",
+            type: "boolean",
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Provide_full_support_for_iterables_in_for_of_spread_and_destructuring_when_targeting_ES5_or_ES3
+        },
+        {
+            name: "isolatedModules",
+            type: "boolean",
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Transpile_each_file_as_a_separate_module_similar_to_ts_transpileModule
+        },
+        // Strict Type Checks
+        {
+            name: "strict",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Strict_Type_Checking_Options,
+            description: ts.Diagnostics.Enable_all_strict_type_checking_options
+        },
+        {
+            name: "noImplicitAny",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Strict_Type_Checking_Options,
+            description: ts.Diagnostics.Raise_error_on_expressions_and_declarations_with_an_implied_any_type,
+        },
+        {
+            name: "strictNullChecks",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Strict_Type_Checking_Options,
+            description: ts.Diagnostics.Enable_strict_null_checks
+        },
+        {
+            name: "strictFunctionTypes",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Strict_Type_Checking_Options,
+            description: ts.Diagnostics.Enable_strict_checking_of_function_types
+        },
+        {
+            name: "strictPropertyInitialization",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Strict_Type_Checking_Options,
+            description: ts.Diagnostics.Enable_strict_checking_of_property_initialization_in_classes
+        },
+        {
+            name: "noImplicitThis",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Strict_Type_Checking_Options,
+            description: ts.Diagnostics.Raise_error_on_this_expressions_with_an_implied_any_type,
+        },
+        {
+            name: "alwaysStrict",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Strict_Type_Checking_Options,
+            description: ts.Diagnostics.Parse_in_strict_mode_and_emit_use_strict_for_each_source_file
+        },
+        // Additional Checks
+        {
+            name: "noUnusedLocals",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Additional_Checks,
+            description: ts.Diagnostics.Report_errors_on_unused_locals,
+        },
+        {
+            name: "noUnusedParameters",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Additional_Checks,
+            description: ts.Diagnostics.Report_errors_on_unused_parameters,
+        },
+        {
+            name: "noImplicitReturns",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Additional_Checks,
+            description: ts.Diagnostics.Report_error_when_not_all_code_paths_in_function_return_a_value
+        },
+        {
+            name: "noFallthroughCasesInSwitch",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Additional_Checks,
+            description: ts.Diagnostics.Report_errors_for_fallthrough_cases_in_switch_statement
+        },
+        // Module Resolution
+        {
+            name: "moduleResolution",
+            type: ts.createMapFromTemplate({
+                node: ts.ModuleResolutionKind.NodeJs,
+                classic: ts.ModuleResolutionKind.Classic,
+            }),
+            paramType: ts.Diagnostics.STRATEGY,
+            category: ts.Diagnostics.Module_Resolution_Options,
+            description: ts.Diagnostics.Specify_module_resolution_strategy_Colon_node_Node_js_or_classic_TypeScript_pre_1_6,
+        },
+        {
+            name: "baseUrl",
+            type: "string",
+            isFilePath: true,
+            category: ts.Diagnostics.Module_Resolution_Options,
+            description: ts.Diagnostics.Base_directory_to_resolve_non_absolute_module_names
+        },
+        {
+            // this option can only be specified in tsconfig.json
+            // use type = object to copy the value as-is
+            name: "paths",
+            type: "object",
+            isTSConfigOnly: true,
+            category: ts.Diagnostics.Module_Resolution_Options,
+            description: ts.Diagnostics.A_series_of_entries_which_re_map_imports_to_lookup_locations_relative_to_the_baseUrl
+        },
+        {
+            // this option can only be specified in tsconfig.json
+            // use type = object to copy the value as-is
+            name: "rootDirs",
+            type: "list",
+            isTSConfigOnly: true,
+            element: {
+                name: "rootDirs",
+                type: "string",
+                isFilePath: true
+            },
+            category: ts.Diagnostics.Module_Resolution_Options,
+            description: ts.Diagnostics.List_of_root_folders_whose_combined_content_represents_the_structure_of_the_project_at_runtime
+        },
+        {
+            name: "typeRoots",
+            type: "list",
+            element: {
+                name: "typeRoots",
+                type: "string",
+                isFilePath: true
+            },
+            category: ts.Diagnostics.Module_Resolution_Options,
+            description: ts.Diagnostics.List_of_folders_to_include_type_definitions_from
+        },
+        {
+            name: "types",
+            type: "list",
+            element: {
+                name: "types",
+                type: "string"
+            },
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Module_Resolution_Options,
+            description: ts.Diagnostics.Type_declaration_files_to_be_included_in_compilation
+        },
+        {
+            name: "allowSyntheticDefaultImports",
+            type: "boolean",
+            category: ts.Diagnostics.Module_Resolution_Options,
+            description: ts.Diagnostics.Allow_default_imports_from_modules_with_no_default_export_This_does_not_affect_code_emit_just_typechecking
+        },
+        {
+            name: "esModuleInterop",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Module_Resolution_Options,
+            description: ts.Diagnostics.Enables_emit_interoperability_between_CommonJS_and_ES_Modules_via_creation_of_namespace_objects_for_all_imports_Implies_allowSyntheticDefaultImports
+        },
+        {
+            name: "preserveSymlinks",
+            type: "boolean",
+            category: ts.Diagnostics.Module_Resolution_Options,
+            description: ts.Diagnostics.Do_not_resolve_the_real_path_of_symlinks,
+        },
+        // Source Maps
+        {
+            name: "sourceRoot",
+            type: "string",
+            isFilePath: true,
+            paramType: ts.Diagnostics.LOCATION,
+            category: ts.Diagnostics.Source_Map_Options,
+            description: ts.Diagnostics.Specify_the_location_where_debugger_should_locate_TypeScript_files_instead_of_source_locations,
+        },
+        {
+            name: "mapRoot",
+            type: "string",
+            isFilePath: true,
+            paramType: ts.Diagnostics.LOCATION,
+            category: ts.Diagnostics.Source_Map_Options,
+            description: ts.Diagnostics.Specify_the_location_where_debugger_should_locate_map_files_instead_of_generated_locations,
+        },
+        {
+            name: "inlineSourceMap",
+            type: "boolean",
+            category: ts.Diagnostics.Source_Map_Options,
+            description: ts.Diagnostics.Emit_a_single_file_with_source_maps_instead_of_having_a_separate_file
+        },
+        {
+            name: "inlineSources",
+            type: "boolean",
+            category: ts.Diagnostics.Source_Map_Options,
+            description: ts.Diagnostics.Emit_the_source_alongside_the_sourcemaps_within_a_single_file_requires_inlineSourceMap_or_sourceMap_to_be_set
+        },
+        // Experimental
+        {
+            name: "experimentalDecorators",
+            type: "boolean",
+            category: ts.Diagnostics.Experimental_Options,
+            description: ts.Diagnostics.Enables_experimental_support_for_ES7_decorators
+        },
+        {
+            name: "emitDecoratorMetadata",
+            type: "boolean",
+            category: ts.Diagnostics.Experimental_Options,
+            description: ts.Diagnostics.Enables_experimental_support_for_emitting_type_metadata_for_decorators
+        },
+        // Advanced
+        {
+            name: "jsxFactory",
+            type: "string",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Specify_the_JSX_factory_function_to_use_when_targeting_react_JSX_emit_e_g_React_createElement_or_h
+        },
+        {
+            name: "diagnostics",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Show_diagnostic_information
+        },
+        {
+            name: "extendedDiagnostics",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Show_verbose_diagnostic_information
+        },
+        {
+            name: "traceResolution",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Enable_tracing_of_the_name_resolution_process
+        },
+        {
+            name: "resolveJsonModule",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Include_modules_imported_with_json_extension
+        },
+        {
+            name: "listFiles",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Print_names_of_files_part_of_the_compilation
+        },
+        {
+            name: "listEmittedFiles",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Print_names_of_generated_files_part_of_the_compilation
+        },
+        {
+            name: "out",
+            type: "string",
+            isFilePath: false,
+            // for correct behaviour, please use outFile
+            category: ts.Diagnostics.Advanced_Options,
+            paramType: ts.Diagnostics.FILE,
+            description: ts.Diagnostics.Deprecated_Use_outFile_instead_Concatenate_and_emit_output_to_single_file,
+        },
+        {
+            name: "reactNamespace",
+            type: "string",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Deprecated_Use_jsxFactory_instead_Specify_the_object_invoked_for_createElement_when_targeting_react_JSX_emit
+        },
+        {
+            name: "skipDefaultLibCheck",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Deprecated_Use_skipLibCheck_instead_Skip_type_checking_of_default_library_declaration_files
+        },
+        {
+            name: "charset",
+            type: "string",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.The_character_set_of_the_input_files
+        },
+        {
+            name: "emitBOM",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Emit_a_UTF_8_Byte_Order_Mark_BOM_in_the_beginning_of_output_files
+        },
+        {
+            name: "locale",
+            type: "string",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.The_locale_used_when_displaying_messages_to_the_user_e_g_en_us
+        },
+        {
+            name: "newLine",
+            type: ts.createMapFromTemplate({
+                crlf: 0 /* CarriageReturnLineFeed */,
+                lf: 1 /* LineFeed */
+            }),
+            paramType: ts.Diagnostics.NEWLINE,
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Specify_the_end_of_line_sequence_to_be_used_when_emitting_files_Colon_CRLF_dos_or_LF_unix,
+        },
+        {
+            name: "noErrorTruncation",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Do_not_truncate_error_messages
+        },
+        {
+            name: "noLib",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Do_not_include_the_default_library_file_lib_d_ts
+        },
+        {
+            name: "noResolve",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Do_not_add_triple_slash_references_or_imported_modules_to_the_list_of_compiled_files
+        },
+        {
+            name: "stripInternal",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Do_not_emit_declarations_for_code_that_has_an_internal_annotation,
+        },
+        {
+            name: "disableSizeLimit",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Disable_size_limitations_on_JavaScript_projects
+        },
+        {
+            name: "noImplicitUseStrict",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Do_not_emit_use_strict_directives_in_module_output
+        },
+        {
+            name: "noEmitHelpers",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Do_not_generate_custom_helper_functions_like_extends_in_compiled_output
+        },
+        {
+            name: "noEmitOnError",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Do_not_emit_outputs_if_any_errors_were_reported,
+        },
+        {
+            name: "preserveConstEnums",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Do_not_erase_const_enum_declarations_in_generated_code
+        },
+        {
+            name: "declarationDir",
+            type: "string",
+            isFilePath: true,
+            paramType: ts.Diagnostics.DIRECTORY,
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Output_directory_for_generated_declaration_files
+        },
+        {
+            name: "skipLibCheck",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Skip_type_checking_of_declaration_files,
+        },
+        {
+            name: "allowUnusedLabels",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Do_not_report_errors_on_unused_labels
+        },
+        {
+            name: "allowUnreachableCode",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Do_not_report_errors_on_unreachable_code
+        },
+        {
+            name: "suppressExcessPropertyErrors",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Suppress_excess_property_checks_for_object_literals,
+        },
+        {
+            name: "suppressImplicitAnyIndexErrors",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Suppress_noImplicitAny_errors_for_indexing_objects_lacking_index_signatures,
+        },
+        {
+            name: "forceConsistentCasingInFileNames",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Disallow_inconsistently_cased_references_to_the_same_file
+        },
+        {
+            name: "maxNodeModuleJsDepth",
+            type: "number",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.The_maximum_dependency_depth_to_search_under_node_modules_and_load_JavaScript_files
+        },
+        {
+            name: "noStrictGenericChecks",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Disable_strict_checking_of_generic_signatures_in_function_types,
+        },
+        {
+            name: "keyofStringsOnly",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Resolve_keyof_to_string_valued_property_names_only_no_numbers_or_symbols,
+        },
+        {
+            // A list of plugins to load in the language service
+            name: "plugins",
+            type: "list",
+            isTSConfigOnly: true,
+            element: {
+                name: "plugin",
+                type: "object"
+            },
+            description: ts.Diagnostics.List_of_language_service_plugins
         }
-        return 1;
-    }
-    var binder = createBinder();
-    function bindSourceFile(file, options) {
-        ts.performance.mark("beforeBind");
-        binder(file, options);
-        ts.performance.mark("afterBind");
-        ts.performance.measure("Bind", "beforeBind", "afterBind");
-    }
-    ts.bindSourceFile = bindSourceFile;
-    function createBinder() {
-        var file;
-        var options;
-        var languageVersion;
-        var parent;
-        var container;
-        var thisParentContainer;
-        var blockScopeContainer;
-        var lastContainer;
-        var delayedTypeAliases;
-        var seenThisKeyword;
-        var currentFlow;
-        var currentBreakTarget;
-        var currentContinueTarget;
-        var currentReturnTarget;
-        var currentTrueTarget;
-        var currentFalseTarget;
-        var preSwitchCaseFlow;
-        var activeLabels;
-        var hasExplicitReturn;
-        var emitFlags;
-        var inStrictMode;
-        var symbolCount = 0;
-        var Symbol;
-        var classifiableNames;
-        var unreachableFlow = { flags: 1 };
-        var reportedUnreachableFlow = { flags: 1 };
-        var subtreeTransformFlags = 0;
-        var skipTransformFlagAggregation;
-        function createDiagnosticForNode(node, message, arg0, arg1, arg2) {
-            return ts.createDiagnosticForNodeInSourceFile(ts.getSourceFileOfNode(node) || file, node, message, arg0, arg1, arg2);
-        }
-        function bindSourceFile(f, opts) {
-            file = f;
-            options = opts;
-            languageVersion = ts.getEmitScriptTarget(options);
-            inStrictMode = bindInStrictMode(file, opts);
-            classifiableNames = ts.createUnderscoreEscapedMap();
-            symbolCount = 0;
-            skipTransformFlagAggregation = file.isDeclarationFile;
-            Symbol = ts.objectAllocator.getSymbolConstructor();
-            if (!file.locals) {
-                bind(file);
-                file.symbolCount = symbolCount;
-                file.classifiableNames = classifiableNames;
-                delayedBindJSDocTypedefTag();
+    ];
+    /* @internal */
+    ts.typeAcquisitionDeclarations = [
+        {
+            /* @deprecated typingOptions.enableAutoDiscovery
+             * Use typeAcquisition.enable instead.
+             */
+            name: "enableAutoDiscovery",
+            type: "boolean",
+        },
+        {
+            name: "enable",
+            type: "boolean",
+        },
+        {
+            name: "include",
+            type: "list",
+            element: {
+                name: "include",
+                type: "string"
             }
-            file = undefined;
-            options = undefined;
-            languageVersion = undefined;
-            parent = undefined;
-            container = undefined;
-            thisParentContainer = undefined;
-            blockScopeContainer = undefined;
-            lastContainer = undefined;
-            delayedTypeAliases = undefined;
-            seenThisKeyword = false;
-            currentFlow = undefined;
-            currentBreakTarget = undefined;
-            currentContinueTarget = undefined;
-            currentReturnTarget = undefined;
-            currentTrueTarget = undefined;
-            currentFalseTarget = undefined;
-            activeLabels = undefined;
-            hasExplicitReturn = false;
-            emitFlags = 0;
-            subtreeTransformFlags = 0;
-        }
-        return bindSourceFile;
-        function bindInStrictMode(file, opts) {
-            if (ts.getStrictOptionValue(opts, "alwaysStrict") && !file.isDeclarationFile) {
-                return true;
-            }
-            else {
-                return !!file.externalModuleIndicator;
+        },
+        {
+            name: "exclude",
+            type: "list",
+            element: {
+                name: "exclude",
+                type: "string"
             }
         }
-        function createSymbol(flags, name) {
-            symbolCount++;
-            return new Symbol(flags, name);
-        }
-        function addDeclarationToSymbol(symbol, node, symbolFlags) {
-            symbol.flags |= symbolFlags;
-            node.symbol = symbol;
-            symbol.declarations = ts.append(symbol.declarations, node);
-            if (symbolFlags & 1952 && !symbol.exports) {
-                symbol.exports = ts.createSymbolTable();
-            }
-            if (symbolFlags & 6240 && !symbol.members) {
-                symbol.members = ts.createSymbolTable();
-            }
-            if (symbolFlags & 67216319) {
-                var valueDeclaration = symbol.valueDeclaration;
-                if (!valueDeclaration ||
-                    (valueDeclaration.kind !== node.kind && valueDeclaration.kind === 239)) {
-                    symbol.valueDeclaration = node;
-                }
-            }
-        }
-        function getDeclarationName(node) {
-            if (node.kind === 249) {
-                return node.isExportEquals ? "export=" : "default";
-            }
-            var name = ts.getNameOfDeclaration(node);
-            if (name) {
-                if (ts.isAmbientModule(node)) {
-                    var moduleName = ts.getTextOfIdentifierOrLiteral(name);
-                    return (ts.isGlobalScopeAugmentation(node) ? "__global" : "\"" + moduleName + "\"");
-                }
-                if (name.kind === 147) {
-                    var nameExpression = name.expression;
-                    if (ts.isStringOrNumericLiteral(nameExpression)) {
-                        return ts.escapeLeadingUnderscores(nameExpression.text);
-                    }
-                    ts.Debug.assert(ts.isWellKnownSymbolSyntactically(nameExpression));
-                    return ts.getPropertyNameForKnownSymbolName(ts.idText(nameExpression.name));
-                }
-                return ts.isPropertyNameLiteral(name) ? ts.getEscapedTextOfIdentifierOrLiteral(name) : undefined;
-            }
-            switch (node.kind) {
-                case 155:
-                    return "__constructor";
-                case 163:
-                case 158:
-                case 288:
-                    return "__call";
-                case 164:
-                case 159:
-                    return "__new";
-                case 160:
-                    return "__index";
-                case 250:
-                    return "__export";
-                case 274:
-                    return "export=";
-                case 200:
-                    if (ts.getSpecialPropertyAssignmentKind(node) === 2) {
-                        return "export=";
-                    }
-                    ts.Debug.fail("Unknown binary declaration kind");
-                    break;
-                case 284:
-                    return (ts.isJSDocConstructSignature(node) ? "__new" : "__call");
-                case 149:
-                    ts.Debug.assert(node.parent.kind === 284, "Impossible parameter parent kind", function () { return "parent is: " + (ts.SyntaxKind ? ts.SyntaxKind[node.parent.kind] : node.parent.kind) + ", expected JSDocFunctionType"; });
-                    var functionType = node.parent;
-                    var index = functionType.parameters.indexOf(node);
-                    return "arg" + index;
-            }
-        }
-        function getDisplayName(node) {
-            return ts.isNamedDeclaration(node) ? ts.declarationNameToString(node.name) : ts.unescapeLeadingUnderscores(getDeclarationName(node));
-        }
-        function declareSymbol(symbolTable, parent, node, includes, excludes, isReplaceableByMethod) {
-            ts.Debug.assert(!ts.hasDynamicName(node));
-            var isDefaultExport = ts.hasModifier(node, 512);
-            var name = isDefaultExport && parent ? "default" : getDeclarationName(node);
-            var symbol;
-            if (name === undefined) {
-                symbol = createSymbol(0, "__missing");
-            }
-            else {
-                symbol = symbolTable.get(name);
-                if (includes & 2885600) {
-                    classifiableNames.set(name, true);
-                }
-                if (!symbol) {
-                    symbolTable.set(name, symbol = createSymbol(0, name));
-                    if (isReplaceableByMethod)
-                        symbol.isReplaceableByMethod = true;
-                }
-                else if (isReplaceableByMethod && !symbol.isReplaceableByMethod) {
-                    return symbol;
-                }
-                else if (symbol.flags & excludes) {
-                    if (symbol.isReplaceableByMethod) {
-                        symbolTable.set(name, symbol = createSymbol(0, name));
-                    }
-                    else {
-                        if (ts.isNamedDeclaration(node)) {
-                            node.name.parent = node;
-                        }
-                        var message_1 = symbol.flags & 2
-                            ? ts.Diagnostics.Cannot_redeclare_block_scoped_variable_0
-                            : ts.Diagnostics.Duplicate_identifier_0;
-                        if (symbol.flags & 384 || includes & 384) {
-                            message_1 = ts.Diagnostics.Enum_declarations_can_only_merge_with_namespace_or_other_enum_declarations;
-                        }
-                        if (symbol.declarations && symbol.declarations.length) {
-                            if (isDefaultExport) {
-                                message_1 = ts.Diagnostics.A_module_cannot_have_multiple_default_exports;
-                            }
-                            else {
-                                if (symbol.declarations && symbol.declarations.length &&
-                                    (node.kind === 249 && !node.isExportEquals)) {
-                                    message_1 = ts.Diagnostics.A_module_cannot_have_multiple_default_exports;
-                                }
-                            }
-                        }
-                        ts.forEach(symbol.declarations, function (declaration) {
-                            file.bindDiagnostics.push(createDiagnosticForNode(ts.getNameOfDeclaration(declaration) || declaration, message_1, getDisplayName(declaration)));
-                        });
-                        file.bindDiagnostics.push(createDiagnosticForNode(ts.getNameOfDeclaration(node) || node, message_1, getDisplayName(node)));
-                        symbol = createSymbol(0, name);
-                    }
-                }
-            }
-            addDeclarationToSymbol(symbol, node, includes);
-            if (symbol.parent) {
-                ts.Debug.assert(symbol.parent === parent, "Existing symbol parent should match new one");
-            }
-            else {
-                symbol.parent = parent;
-            }
-            return symbol;
-        }
-        function declareModuleMember(node, symbolFlags, symbolExcludes) {
-            var hasExportModifier = ts.getCombinedModifierFlags(node) & 1;
-            if (symbolFlags & 2097152) {
-                if (node.kind === 252 || (node.kind === 243 && hasExportModifier)) {
-                    return declareSymbol(container.symbol.exports, container.symbol, node, symbolFlags, symbolExcludes);
-                }
-                else {
-                    return declareSymbol(container.locals, undefined, node, symbolFlags, symbolExcludes);
-                }
-            }
-            else {
-                if (ts.isJSDocTypeAlias(node))
-                    ts.Debug.assert(ts.isInJavaScriptFile(node));
-                if ((!ts.isAmbientModule(node) && (hasExportModifier || container.flags & 32)) || ts.isJSDocTypeAlias(node)) {
-                    if (ts.hasModifier(node, 512) && !getDeclarationName(node)) {
-                        return declareSymbol(container.symbol.exports, container.symbol, node, symbolFlags, symbolExcludes);
-                    }
-                    var exportKind = symbolFlags & 67216319 ? 1048576 : 0;
-                    var local = declareSymbol(container.locals, undefined, node, exportKind, symbolExcludes);
-                    local.exportSymbol = declareSymbol(container.symbol.exports, container.symbol, node, symbolFlags, symbolExcludes);
-                    node.localSymbol = local;
-                    return local;
-                }
-                else {
-                    return declareSymbol(container.locals, undefined, node, symbolFlags, symbolExcludes);
-                }
-            }
-        }
-        function bindContainer(node, containerFlags) {
-            var saveContainer = container;
-            var saveThisParentContainer = thisParentContainer;
-            var savedBlockScopeContainer = blockScopeContainer;
-            if (containerFlags & 1) {
-                if (node.kind !== 193) {
-                    thisParentContainer = container;
-                }
-                container = blockScopeContainer = node;
-                if (containerFlags & 32) {
-                    container.locals = ts.createSymbolTable();
-                }
-                addToContainerChain(container);
-            }
-            else if (containerFlags & 2) {
-                blockScopeContainer = node;
-                blockScopeContainer.locals = undefined;
-            }
-            if (containerFlags & 4) {
-                var saveCurrentFlow = currentFlow;
-                var saveBreakTarget = currentBreakTarget;
-                var saveContinueTarget = currentContinueTarget;
-                var saveReturnTarget = currentReturnTarget;
-                var saveActiveLabels = activeLabels;
-                var saveHasExplicitReturn = hasExplicitReturn;
-                var isIIFE = containerFlags & 16 && !ts.hasModifier(node, 256) &&
-                    !node.asteriskToken && !!ts.getImmediatelyInvokedFunctionExpression(node);
-                if (!isIIFE) {
-                    currentFlow = { flags: 2 };
-                    if (containerFlags & (16 | 128)) {
-                        currentFlow.container = node;
-                    }
-                }
-                currentReturnTarget = isIIFE || node.kind === 155 ? createBranchLabel() : undefined;
-                currentBreakTarget = undefined;
-                currentContinueTarget = undefined;
-                activeLabels = undefined;
-                hasExplicitReturn = false;
-                bindChildren(node);
-                node.flags &= ~1408;
-                if (!(currentFlow.flags & 1) && containerFlags & 8 && ts.nodeIsPresent(node.body)) {
-                    node.flags |= 128;
-                    if (hasExplicitReturn)
-                        node.flags |= 256;
-                }
-                if (node.kind === 274) {
-                    node.flags |= emitFlags;
-                }
-                if (currentReturnTarget) {
-                    addAntecedent(currentReturnTarget, currentFlow);
-                    currentFlow = finishFlowLabel(currentReturnTarget);
-                    if (node.kind === 155) {
-                        node.returnFlowNode = currentFlow;
-                    }
-                }
-                if (!isIIFE) {
-                    currentFlow = saveCurrentFlow;
-                }
-                currentBreakTarget = saveBreakTarget;
-                currentContinueTarget = saveContinueTarget;
-                currentReturnTarget = saveReturnTarget;
-                activeLabels = saveActiveLabels;
-                hasExplicitReturn = saveHasExplicitReturn;
-            }
-            else if (containerFlags & 64) {
-                seenThisKeyword = false;
-                bindChildren(node);
-                node.flags = seenThisKeyword ? node.flags | 64 : node.flags & ~64;
-            }
-            else {
-                bindChildren(node);
-            }
-            container = saveContainer;
-            thisParentContainer = saveThisParentContainer;
-            blockScopeContainer = savedBlockScopeContainer;
-        }
-        function bindChildren(node) {
-            if (skipTransformFlagAggregation) {
-                bindChildrenWorker(node);
-            }
-            else if (node.transformFlags & 536870912) {
-                skipTransformFlagAggregation = true;
-                bindChildrenWorker(node);
-                skipTransformFlagAggregation = false;
-                subtreeTransformFlags |= node.transformFlags & ~getTransformFlagsSubtreeExclusions(node.kind);
-            }
-            else {
-                var savedSubtreeTransformFlags = subtreeTransformFlags;
-                subtreeTransformFlags = 0;
-                bindChildrenWorker(node);
-                subtreeTransformFlags = savedSubtreeTransformFlags | computeTransformFlagsForNode(node, subtreeTransformFlags);
-            }
-        }
-        function bindEachFunctionsFirst(nodes) {
-            bindEach(nodes, function (n) { return n.kind === 234 ? bind(n) : undefined; });
-            bindEach(nodes, function (n) { return n.kind !== 234 ? bind(n) : undefined; });
-        }
-        function bindEach(nodes, bindFunction) {
-            if (bindFunction === void 0) { bindFunction = bind; }
-            if (nodes === undefined) {
-                return;
-            }
-            if (skipTransformFlagAggregation) {
-                ts.forEach(nodes, bindFunction);
-            }
-            else {
-                var savedSubtreeTransformFlags = subtreeTransformFlags;
-                subtreeTransformFlags = 0;
-                var nodeArrayFlags = 0;
-                for (var _i = 0, nodes_2 = nodes; _i < nodes_2.length; _i++) {
-                    var node = nodes_2[_i];
-                    bindFunction(node);
-                    nodeArrayFlags |= node.transformFlags & ~536870912;
-                }
-                nodes.transformFlags = nodeArrayFlags | 536870912;
-                subtreeTransformFlags |= savedSubtreeTransformFlags;
-            }
-        }
-        function bindEachChild(node) {
-            ts.forEachChild(node, bind, bindEach);
-        }
-        function bindChildrenWorker(node) {
-            if (checkUnreachable(node)) {
-                bindEachChild(node);
-                return;
-            }
-            switch (node.kind) {
-                case 219:
-                    bindWhileStatement(node);
-                    break;
-                case 218:
-                    bindDoStatement(node);
-                    break;
-                case 220:
-                    bindForStatement(node);
-                    break;
-                case 221:
-                case 222:
-                    bindForInOrForOfStatement(node);
-                    break;
-                case 217:
-                    bindIfStatement(node);
-                    break;
-                case 225:
-                case 229:
-                    bindReturnOrThrow(node);
-                    break;
-                case 224:
-                case 223:
-                    bindBreakOrContinueStatement(node);
-                    break;
-                case 230:
-                    bindTryStatement(node);
-                    break;
-                case 227:
-                    bindSwitchStatement(node);
-                    break;
-                case 241:
-                    bindCaseBlock(node);
-                    break;
-                case 266:
-                    bindCaseClause(node);
-                    break;
-                case 228:
-                    bindLabeledStatement(node);
-                    break;
-                case 198:
-                    bindPrefixUnaryExpressionFlow(node);
-                    break;
-                case 199:
-                    bindPostfixUnaryExpressionFlow(node);
-                    break;
-                case 200:
-                    bindBinaryExpressionFlow(node);
-                    break;
-                case 194:
-                    bindDeleteExpressionFlow(node);
-                    break;
-                case 201:
-                    bindConditionalExpressionFlow(node);
-                    break;
-                case 232:
-                    bindVariableDeclarationFlow(node);
-                    break;
-                case 187:
-                    bindCallExpressionFlow(node);
-                    break;
-                case 297:
-                case 292:
-                    bindJSDocTypeAlias(node);
-                    break;
-                case 274:
-                    bindEachFunctionsFirst(node.statements);
-                    bind(node.endOfFileToken);
-                    break;
-                case 213:
-                case 240:
-                    bindEachFunctionsFirst(node.statements);
-                    break;
-                default:
-                    bindEachChild(node);
-                    break;
-            }
-            bindJSDoc(node);
-        }
-        function isNarrowingExpression(expr) {
-            switch (expr.kind) {
-                case 71:
-                case 99:
-                case 185:
-                    return isNarrowableReference(expr);
-                case 187:
-                    return hasNarrowableArgument(expr);
-                case 191:
-                    return isNarrowingExpression(expr.expression);
-                case 200:
-                    return isNarrowingBinaryExpression(expr);
-                case 198:
-                    return expr.operator === 51 && isNarrowingExpression(expr.operand);
-            }
-            return false;
-        }
-        function isNarrowableReference(expr) {
-            return expr.kind === 71 ||
-                expr.kind === 99 ||
-                expr.kind === 97 ||
-                expr.kind === 185 && isNarrowableReference(expr.expression);
-        }
-        function hasNarrowableArgument(expr) {
-            if (expr.arguments) {
-                for (var _i = 0, _a = expr.arguments; _i < _a.length; _i++) {
-                    var argument = _a[_i];
-                    if (isNarrowableReference(argument)) {
-                        return true;
-                    }
-                }
-            }
-            if (expr.expression.kind === 185 &&
-                isNarrowableReference(expr.expression.expression)) {
-                return true;
-            }
-            return false;
-        }
-        function isNarrowingTypeofOperands(expr1, expr2) {
-            return ts.isTypeOfExpression(expr1) && isNarrowableOperand(expr1.expression) && ts.isStringLiteralLike(expr2);
-        }
-        function isNarrowableInOperands(left, right) {
-            return ts.isStringLiteralLike(left) && isNarrowingExpression(right);
-        }
-        function isNarrowingBinaryExpression(expr) {
-            switch (expr.operatorToken.kind) {
-                case 58:
-                    return isNarrowableReference(expr.left);
-                case 32:
-                case 33:
-                case 34:
-                case 35:
-                    return isNarrowableOperand(expr.left) || isNarrowableOperand(expr.right) ||
-                        isNarrowingTypeofOperands(expr.right, expr.left) || isNarrowingTypeofOperands(expr.left, expr.right);
-                case 93:
-                    return isNarrowableOperand(expr.left);
-                case 92:
-                    return isNarrowableInOperands(expr.left, expr.right);
-                case 26:
-                    return isNarrowingExpression(expr.right);
-            }
-            return false;
-        }
-        function isNarrowableOperand(expr) {
-            switch (expr.kind) {
-                case 191:
-                    return isNarrowableOperand(expr.expression);
-                case 200:
-                    switch (expr.operatorToken.kind) {
-                        case 58:
-                            return isNarrowableOperand(expr.left);
-                        case 26:
-                            return isNarrowableOperand(expr.right);
-                    }
-            }
-            return isNarrowableReference(expr);
-        }
-        function createBranchLabel() {
+    ];
+    /* @internal */
+    ts.defaultInitCompilerOptions = {
+        module: ts.ModuleKind.CommonJS,
+        target: 1 /* ES5 */,
+        strict: true,
+        esModuleInterop: true
+    };
+    var optionNameMapCache;
+    /* @internal */
+    function convertEnableAutoDiscoveryToEnable(typeAcquisition) {
+        // Convert deprecated typingOptions.enableAutoDiscovery to typeAcquisition.enable
+        if (typeAcquisition && typeAcquisition.enableAutoDiscovery !== undefined && typeAcquisition.enable === undefined) {
             return {
-                flags: 4,
-                antecedents: undefined
+                enable: typeAcquisition.enableAutoDiscovery,
+                include: typeAcquisition.include || [],
+                exclude: typeAcquisition.exclude || []
             };
         }
-        function createLoopLabel() {
-            return {
-                flags: 8,
-                antecedents: undefined
-            };
+        return typeAcquisition;
+    }
+    ts.convertEnableAutoDiscoveryToEnable = convertEnableAutoDiscoveryToEnable;
+    function getOptionNameMap() {
+        if (optionNameMapCache) {
+            return optionNameMapCache;
         }
-        function setFlowNodeReferenced(flow) {
-            flow.flags |= flow.flags & 512 ? 1024 : 512;
-        }
-        function addAntecedent(label, antecedent) {
-            if (!(antecedent.flags & 1) && !ts.contains(label.antecedents, antecedent)) {
-                (label.antecedents || (label.antecedents = [])).push(antecedent);
-                setFlowNodeReferenced(antecedent);
-            }
-        }
-        function createFlowCondition(flags, antecedent, expression) {
-            if (antecedent.flags & 1) {
-                return antecedent;
-            }
-            if (!expression) {
-                return flags & 32 ? antecedent : unreachableFlow;
-            }
-            if (expression.kind === 101 && flags & 64 ||
-                expression.kind === 86 && flags & 32) {
-                return unreachableFlow;
-            }
-            if (!isNarrowingExpression(expression)) {
-                return antecedent;
-            }
-            setFlowNodeReferenced(antecedent);
-            return { flags: flags, expression: expression, antecedent: antecedent };
-        }
-        function createFlowSwitchClause(antecedent, switchStatement, clauseStart, clauseEnd) {
-            if (!isNarrowingExpression(switchStatement.expression)) {
-                return antecedent;
-            }
-            setFlowNodeReferenced(antecedent);
-            return { flags: 128, switchStatement: switchStatement, clauseStart: clauseStart, clauseEnd: clauseEnd, antecedent: antecedent };
-        }
-        function createFlowAssignment(antecedent, node) {
-            setFlowNodeReferenced(antecedent);
-            return { flags: 16, antecedent: antecedent, node: node };
-        }
-        function createFlowArrayMutation(antecedent, node) {
-            setFlowNodeReferenced(antecedent);
-            var res = { flags: 256, antecedent: antecedent, node: node };
-            return res;
-        }
-        function finishFlowLabel(flow) {
-            var antecedents = flow.antecedents;
-            if (!antecedents) {
-                return unreachableFlow;
-            }
-            if (antecedents.length === 1) {
-                return antecedents[0];
-            }
-            return flow;
-        }
-        function isStatementCondition(node) {
-            var parent = node.parent;
-            switch (parent.kind) {
-                case 217:
-                case 219:
-                case 218:
-                    return parent.expression === node;
-                case 220:
-                case 201:
-                    return parent.condition === node;
-            }
-            return false;
-        }
-        function isLogicalExpression(node) {
-            while (true) {
-                if (node.kind === 191) {
-                    node = node.expression;
-                }
-                else if (node.kind === 198 && node.operator === 51) {
-                    node = node.operand;
-                }
-                else {
-                    return node.kind === 200 && (node.operatorToken.kind === 53 ||
-                        node.operatorToken.kind === 54);
-                }
-            }
-        }
-        function isTopLevelLogicalExpression(node) {
-            while (node.parent.kind === 191 ||
-                node.parent.kind === 198 &&
-                    node.parent.operator === 51) {
-                node = node.parent;
-            }
-            return !isStatementCondition(node) && !isLogicalExpression(node.parent);
-        }
-        function bindCondition(node, trueTarget, falseTarget) {
-            var saveTrueTarget = currentTrueTarget;
-            var saveFalseTarget = currentFalseTarget;
-            currentTrueTarget = trueTarget;
-            currentFalseTarget = falseTarget;
-            bind(node);
-            currentTrueTarget = saveTrueTarget;
-            currentFalseTarget = saveFalseTarget;
-            if (!node || !isLogicalExpression(node)) {
-                addAntecedent(trueTarget, createFlowCondition(32, currentFlow, node));
-                addAntecedent(falseTarget, createFlowCondition(64, currentFlow, node));
-            }
-        }
-        function bindIterativeStatement(node, breakTarget, continueTarget) {
-            var saveBreakTarget = currentBreakTarget;
-            var saveContinueTarget = currentContinueTarget;
-            currentBreakTarget = breakTarget;
-            currentContinueTarget = continueTarget;
-            bind(node);
-            currentBreakTarget = saveBreakTarget;
-            currentContinueTarget = saveContinueTarget;
-        }
-        function bindWhileStatement(node) {
-            var preWhileLabel = createLoopLabel();
-            var preBodyLabel = createBranchLabel();
-            var postWhileLabel = createBranchLabel();
-            addAntecedent(preWhileLabel, currentFlow);
-            currentFlow = preWhileLabel;
-            bindCondition(node.expression, preBodyLabel, postWhileLabel);
-            currentFlow = finishFlowLabel(preBodyLabel);
-            bindIterativeStatement(node.statement, postWhileLabel, preWhileLabel);
-            addAntecedent(preWhileLabel, currentFlow);
-            currentFlow = finishFlowLabel(postWhileLabel);
-        }
-        function bindDoStatement(node) {
-            var preDoLabel = createLoopLabel();
-            var enclosingLabeledStatement = node.parent.kind === 228
-                ? ts.lastOrUndefined(activeLabels)
-                : undefined;
-            var preConditionLabel = enclosingLabeledStatement ? enclosingLabeledStatement.continueTarget : createBranchLabel();
-            var postDoLabel = enclosingLabeledStatement ? enclosingLabeledStatement.breakTarget : createBranchLabel();
-            addAntecedent(preDoLabel, currentFlow);
-            currentFlow = preDoLabel;
-            bindIterativeStatement(node.statement, postDoLabel, preConditionLabel);
-            addAntecedent(preConditionLabel, currentFlow);
-            currentFlow = finishFlowLabel(preConditionLabel);
-            bindCondition(node.expression, preDoLabel, postDoLabel);
-            currentFlow = finishFlowLabel(postDoLabel);
-        }
-        function bindForStatement(node) {
-            var preLoopLabel = createLoopLabel();
-            var preBodyLabel = createBranchLabel();
-            var postLoopLabel = createBranchLabel();
-            bind(node.initializer);
-            addAntecedent(preLoopLabel, currentFlow);
-            currentFlow = preLoopLabel;
-            bindCondition(node.condition, preBodyLabel, postLoopLabel);
-            currentFlow = finishFlowLabel(preBodyLabel);
-            bindIterativeStatement(node.statement, postLoopLabel, preLoopLabel);
-            bind(node.incrementor);
-            addAntecedent(preLoopLabel, currentFlow);
-            currentFlow = finishFlowLabel(postLoopLabel);
-        }
-        function bindForInOrForOfStatement(node) {
-            var preLoopLabel = createLoopLabel();
-            var postLoopLabel = createBranchLabel();
-            addAntecedent(preLoopLabel, currentFlow);
-            currentFlow = preLoopLabel;
-            if (node.kind === 222) {
-                bind(node.awaitModifier);
-            }
-            bind(node.expression);
-            addAntecedent(postLoopLabel, currentFlow);
-            bind(node.initializer);
-            if (node.initializer.kind !== 233) {
-                bindAssignmentTargetFlow(node.initializer);
-            }
-            bindIterativeStatement(node.statement, postLoopLabel, preLoopLabel);
-            addAntecedent(preLoopLabel, currentFlow);
-            currentFlow = finishFlowLabel(postLoopLabel);
-        }
-        function bindIfStatement(node) {
-            var thenLabel = createBranchLabel();
-            var elseLabel = createBranchLabel();
-            var postIfLabel = createBranchLabel();
-            bindCondition(node.expression, thenLabel, elseLabel);
-            currentFlow = finishFlowLabel(thenLabel);
-            bind(node.thenStatement);
-            addAntecedent(postIfLabel, currentFlow);
-            currentFlow = finishFlowLabel(elseLabel);
-            bind(node.elseStatement);
-            addAntecedent(postIfLabel, currentFlow);
-            currentFlow = finishFlowLabel(postIfLabel);
-        }
-        function bindReturnOrThrow(node) {
-            bind(node.expression);
-            if (node.kind === 225) {
-                hasExplicitReturn = true;
-                if (currentReturnTarget) {
-                    addAntecedent(currentReturnTarget, currentFlow);
-                }
-            }
-            currentFlow = unreachableFlow;
-        }
-        function findActiveLabel(name) {
-            if (activeLabels) {
-                for (var _i = 0, activeLabels_1 = activeLabels; _i < activeLabels_1.length; _i++) {
-                    var label = activeLabels_1[_i];
-                    if (label.name === name) {
-                        return label;
-                    }
-                }
+        var optionNameMap = ts.createMap();
+        var shortOptionNames = ts.createMap();
+        ts.forEach(ts.optionDeclarations, function (option) {
+            optionNameMap.set(option.name.toLowerCase(), option);
+            if (option.shortName) {
+                shortOptionNames.set(option.shortName, option.name);
             }
+        });
+        optionNameMapCache = { optionNameMap: optionNameMap, shortOptionNames: shortOptionNames };
+        return optionNameMapCache;
+    }
+    /* @internal */
+    function createCompilerDiagnosticForInvalidCustomType(opt) {
+        return createDiagnosticForInvalidCustomType(opt, ts.createCompilerDiagnostic);
+    }
+    ts.createCompilerDiagnosticForInvalidCustomType = createCompilerDiagnosticForInvalidCustomType;
+    function createDiagnosticForInvalidCustomType(opt, createDiagnostic) {
+        var namesOfType = ts.arrayFrom(opt.type.keys()).map(function (key) { return "'" + key + "'"; }).join(", ");
+        return createDiagnostic(ts.Diagnostics.Argument_for_0_option_must_be_Colon_1, "--" + opt.name, namesOfType);
+    }
+    /* @internal */
+    function parseCustomTypeOption(opt, value, errors) {
+        return convertJsonOptionOfCustomType(opt, trimString(value || ""), errors);
+    }
+    ts.parseCustomTypeOption = parseCustomTypeOption;
+    /* @internal */
+    function parseListTypeOption(opt, value, errors) {
+        if (value === void 0) { value = ""; }
+        value = trimString(value);
+        if (ts.startsWith(value, "-")) {
             return undefined;
         }
-        function bindBreakOrContinueFlow(node, breakTarget, continueTarget) {
-            var flowLabel = node.kind === 224 ? breakTarget : continueTarget;
-            if (flowLabel) {
-                addAntecedent(flowLabel, currentFlow);
-                currentFlow = unreachableFlow;
-            }
+        if (value === "") {
+            return [];
         }
-        function bindBreakOrContinueStatement(node) {
-            bind(node.label);
-            if (node.label) {
-                var activeLabel = findActiveLabel(node.label.escapedText);
-                if (activeLabel) {
-                    activeLabel.referenced = true;
-                    bindBreakOrContinueFlow(node, activeLabel.breakTarget, activeLabel.continueTarget);
+        var values = value.split(",");
+        switch (opt.element.type) {
+            case "number":
+                return ts.map(values, parseInt);
+            case "string":
+                return ts.map(values, function (v) { return v || ""; });
+            default:
+                return ts.mapDefined(values, function (v) { return parseCustomTypeOption(opt.element, v, errors); });
+        }
+    }
+    ts.parseListTypeOption = parseListTypeOption;
+    function parseCommandLine(commandLine, readFile) {
+        var options = {};
+        var fileNames = [];
+        var projectReferences = undefined;
+        var errors = [];
+        parseStrings(commandLine);
+        return {
+            options: options,
+            fileNames: fileNames,
+            projectReferences: projectReferences,
+            errors: errors
+        };
+        function parseStrings(args) {
+            var i = 0;
+            while (i < args.length) {
+                var s = args[i];
+                i++;
+                if (s.charCodeAt(0) === 64 /* at */) {
+                    parseResponseFile(s.slice(1));
                 }
-            }
-            else {
-                bindBreakOrContinueFlow(node, currentBreakTarget, currentContinueTarget);
-            }
-        }
-        function bindTryStatement(node) {
-            var preFinallyLabel = createBranchLabel();
-            var preTryFlow = currentFlow;
-            bind(node.tryBlock);
-            addAntecedent(preFinallyLabel, currentFlow);
-            var flowAfterTry = currentFlow;
-            var flowAfterCatch = unreachableFlow;
-            if (node.catchClause) {
-                currentFlow = preTryFlow;
-                bind(node.catchClause);
-                addAntecedent(preFinallyLabel, currentFlow);
-                flowAfterCatch = currentFlow;
-            }
-            if (node.finallyBlock) {
-                var preFinallyFlow = { flags: 2048, antecedent: preTryFlow, lock: {} };
-                addAntecedent(preFinallyLabel, preFinallyFlow);
-                currentFlow = finishFlowLabel(preFinallyLabel);
-                bind(node.finallyBlock);
-                if (!(currentFlow.flags & 1)) {
-                    if ((flowAfterTry.flags & 1) && (flowAfterCatch.flags & 1)) {
-                        currentFlow = flowAfterTry === reportedUnreachableFlow || flowAfterCatch === reportedUnreachableFlow
-                            ? reportedUnreachableFlow
-                            : unreachableFlow;
-                    }
-                }
-                if (!(currentFlow.flags & 1)) {
-                    var afterFinallyFlow = { flags: 4096, antecedent: currentFlow };
-                    preFinallyFlow.lock = afterFinallyFlow;
-                    currentFlow = afterFinallyFlow;
-                }
-            }
-            else {
-                currentFlow = finishFlowLabel(preFinallyLabel);
-            }
-        }
-        function bindSwitchStatement(node) {
-            var postSwitchLabel = createBranchLabel();
-            bind(node.expression);
-            var saveBreakTarget = currentBreakTarget;
-            var savePreSwitchCaseFlow = preSwitchCaseFlow;
-            currentBreakTarget = postSwitchLabel;
-            preSwitchCaseFlow = currentFlow;
-            bind(node.caseBlock);
-            addAntecedent(postSwitchLabel, currentFlow);
-            var hasDefault = ts.forEach(node.caseBlock.clauses, function (c) { return c.kind === 267; });
-            node.possiblyExhaustive = !hasDefault && !postSwitchLabel.antecedents;
-            if (!hasDefault) {
-                addAntecedent(postSwitchLabel, createFlowSwitchClause(preSwitchCaseFlow, node, 0, 0));
-            }
-            currentBreakTarget = saveBreakTarget;
-            preSwitchCaseFlow = savePreSwitchCaseFlow;
-            currentFlow = finishFlowLabel(postSwitchLabel);
-        }
-        function bindCaseBlock(node) {
-            var savedSubtreeTransformFlags = subtreeTransformFlags;
-            subtreeTransformFlags = 0;
-            var clauses = node.clauses;
-            var fallthroughFlow = unreachableFlow;
-            for (var i = 0; i < clauses.length; i++) {
-                var clauseStart = i;
-                while (!clauses[i].statements.length && i + 1 < clauses.length) {
-                    bind(clauses[i]);
-                    i++;
-                }
-                var preCaseLabel = createBranchLabel();
-                addAntecedent(preCaseLabel, createFlowSwitchClause(preSwitchCaseFlow, node.parent, clauseStart, i + 1));
-                addAntecedent(preCaseLabel, createFlowSwitchClause(preSwitchCaseFlow, node.parent, clauseStart, i + 1));
-                addAntecedent(preCaseLabel, fallthroughFlow);
-                currentFlow = finishFlowLabel(preCaseLabel);
-                var clause = clauses[i];
-                bind(clause);
-                fallthroughFlow = currentFlow;
-                if (!(currentFlow.flags & 1) && i !== clauses.length - 1 && options.noFallthroughCasesInSwitch) {
-                    errorOnFirstToken(clause, ts.Diagnostics.Fallthrough_case_in_switch);
-                }
-            }
-            clauses.transformFlags = subtreeTransformFlags | 536870912;
-            subtreeTransformFlags |= savedSubtreeTransformFlags;
-        }
-        function bindCaseClause(node) {
-            var saveCurrentFlow = currentFlow;
-            currentFlow = preSwitchCaseFlow;
-            bind(node.expression);
-            currentFlow = saveCurrentFlow;
-            bindEach(node.statements);
-        }
-        function pushActiveLabel(name, breakTarget, continueTarget) {
-            var activeLabel = {
-                name: name,
-                breakTarget: breakTarget,
-                continueTarget: continueTarget,
-                referenced: false
-            };
-            (activeLabels || (activeLabels = [])).push(activeLabel);
-            return activeLabel;
-        }
-        function popActiveLabel() {
-            activeLabels.pop();
-        }
-        function bindLabeledStatement(node) {
-            var preStatementLabel = createLoopLabel();
-            var postStatementLabel = createBranchLabel();
-            bind(node.label);
-            addAntecedent(preStatementLabel, currentFlow);
-            var activeLabel = pushActiveLabel(node.label.escapedText, postStatementLabel, preStatementLabel);
-            bind(node.statement);
-            popActiveLabel();
-            if (!activeLabel.referenced && !options.allowUnusedLabels) {
-                errorOrSuggestionOnFirstToken(ts.unusedLabelIsError(options), node, ts.Diagnostics.Unused_label);
-            }
-            if (!node.statement || node.statement.kind !== 218) {
-                addAntecedent(postStatementLabel, currentFlow);
-                currentFlow = finishFlowLabel(postStatementLabel);
-            }
-        }
-        function bindDestructuringTargetFlow(node) {
-            if (node.kind === 200 && node.operatorToken.kind === 58) {
-                bindAssignmentTargetFlow(node.left);
-            }
-            else {
-                bindAssignmentTargetFlow(node);
-            }
-        }
-        function bindAssignmentTargetFlow(node) {
-            if (isNarrowableReference(node)) {
-                currentFlow = createFlowAssignment(currentFlow, node);
-            }
-            else if (node.kind === 183) {
-                for (var _i = 0, _a = node.elements; _i < _a.length; _i++) {
-                    var e = _a[_i];
-                    if (e.kind === 204) {
-                        bindAssignmentTargetFlow(e.expression);
-                    }
-                    else {
-                        bindDestructuringTargetFlow(e);
-                    }
-                }
-            }
-            else if (node.kind === 184) {
-                for (var _b = 0, _c = node.properties; _b < _c.length; _b++) {
-                    var p = _c[_b];
-                    if (p.kind === 270) {
-                        bindDestructuringTargetFlow(p.initializer);
-                    }
-                    else if (p.kind === 271) {
-                        bindAssignmentTargetFlow(p.name);
-                    }
-                    else if (p.kind === 272) {
-                        bindAssignmentTargetFlow(p.expression);
-                    }
-                }
-            }
-        }
-        function bindLogicalExpression(node, trueTarget, falseTarget) {
-            var preRightLabel = createBranchLabel();
-            if (node.operatorToken.kind === 53) {
-                bindCondition(node.left, preRightLabel, falseTarget);
-            }
-            else {
-                bindCondition(node.left, trueTarget, preRightLabel);
-            }
-            currentFlow = finishFlowLabel(preRightLabel);
-            bind(node.operatorToken);
-            bindCondition(node.right, trueTarget, falseTarget);
-        }
-        function bindPrefixUnaryExpressionFlow(node) {
-            if (node.operator === 51) {
-                var saveTrueTarget = currentTrueTarget;
-                currentTrueTarget = currentFalseTarget;
-                currentFalseTarget = saveTrueTarget;
-                bindEachChild(node);
-                currentFalseTarget = currentTrueTarget;
-                currentTrueTarget = saveTrueTarget;
-            }
-            else {
-                bindEachChild(node);
-                if (node.operator === 43 || node.operator === 44) {
-                    bindAssignmentTargetFlow(node.operand);
-                }
-            }
-        }
-        function bindPostfixUnaryExpressionFlow(node) {
-            bindEachChild(node);
-            if (node.operator === 43 || node.operator === 44) {
-                bindAssignmentTargetFlow(node.operand);
-            }
-        }
-        function bindBinaryExpressionFlow(node) {
-            var operator = node.operatorToken.kind;
-            if (operator === 53 || operator === 54) {
-                if (isTopLevelLogicalExpression(node)) {
-                    var postExpressionLabel = createBranchLabel();
-                    bindLogicalExpression(node, postExpressionLabel, postExpressionLabel);
-                    currentFlow = finishFlowLabel(postExpressionLabel);
-                }
-                else {
-                    bindLogicalExpression(node, currentTrueTarget, currentFalseTarget);
-                }
-            }
-            else {
-                bindEachChild(node);
-                if (ts.isAssignmentOperator(operator) && !ts.isAssignmentTarget(node)) {
-                    bindAssignmentTargetFlow(node.left);
-                    if (operator === 58 && node.left.kind === 186) {
-                        var elementAccess = node.left;
-                        if (isNarrowableOperand(elementAccess.expression)) {
-                            currentFlow = createFlowArrayMutation(currentFlow, node);
-                        }
-                    }
-                }
-            }
-        }
-        function bindDeleteExpressionFlow(node) {
-            bindEachChild(node);
-            if (node.expression.kind === 185) {
-                bindAssignmentTargetFlow(node.expression);
-            }
-        }
-        function bindConditionalExpressionFlow(node) {
-            var trueLabel = createBranchLabel();
-            var falseLabel = createBranchLabel();
-            var postExpressionLabel = createBranchLabel();
-            bindCondition(node.condition, trueLabel, falseLabel);
-            currentFlow = finishFlowLabel(trueLabel);
-            bind(node.questionToken);
-            bind(node.whenTrue);
-            addAntecedent(postExpressionLabel, currentFlow);
-            currentFlow = finishFlowLabel(falseLabel);
-            bind(node.colonToken);
-            bind(node.whenFalse);
-            addAntecedent(postExpressionLabel, currentFlow);
-            currentFlow = finishFlowLabel(postExpressionLabel);
-        }
-        function bindInitializedVariableFlow(node) {
-            var name = !ts.isOmittedExpression(node) ? node.name : undefined;
-            if (ts.isBindingPattern(name)) {
-                for (var _i = 0, _a = name.elements; _i < _a.length; _i++) {
-                    var child = _a[_i];
-                    bindInitializedVariableFlow(child);
-                }
-            }
-            else {
-                currentFlow = createFlowAssignment(currentFlow, node);
-            }
-        }
-        function bindVariableDeclarationFlow(node) {
-            bindEachChild(node);
-            if (node.initializer || ts.isForInOrOfStatement(node.parent.parent)) {
-                bindInitializedVariableFlow(node);
-            }
-        }
-        function bindJSDocTypeAlias(node) {
-            if (node.fullName) {
-                setParentPointers(node, node.fullName);
-            }
-        }
-        function bindCallExpressionFlow(node) {
-            var expr = node.expression;
-            while (expr.kind === 191) {
-                expr = expr.expression;
-            }
-            if (expr.kind === 192 || expr.kind === 193) {
-                bindEach(node.typeArguments);
-                bindEach(node.arguments);
-                bind(node.expression);
-            }
-            else {
-                bindEachChild(node);
-            }
-            if (node.expression.kind === 185) {
-                var propertyAccess = node.expression;
-                if (isNarrowableOperand(propertyAccess.expression) && ts.isPushOrUnshiftIdentifier(propertyAccess.name)) {
-                    currentFlow = createFlowArrayMutation(currentFlow, node);
-                }
-            }
-        }
-        function getContainerFlags(node) {
-            switch (node.kind) {
-                case 205:
-                case 235:
-                case 238:
-                case 184:
-                case 166:
-                case 287:
-                case 263:
-                    return 1;
-                case 236:
-                    return 1 | 64;
-                case 239:
-                case 237:
-                case 177:
-                    return 1 | 32;
-                case 274:
-                    return 1 | 4 | 32;
-                case 154:
-                    if (ts.isObjectLiteralOrClassExpressionMethod(node)) {
-                        return 1 | 4 | 32 | 8 | 128;
-                    }
-                case 155:
-                case 234:
-                case 153:
-                case 156:
-                case 157:
-                case 158:
-                case 288:
-                case 284:
-                case 163:
-                case 159:
-                case 160:
-                case 164:
-                    return 1 | 4 | 32 | 8;
-                case 192:
-                case 193:
-                    return 1 | 4 | 32 | 8 | 16;
-                case 240:
-                    return 4;
-                case 152:
-                    return node.initializer ? 4 : 0;
-                case 269:
-                case 220:
-                case 221:
-                case 222:
-                case 241:
-                    return 2;
-                case 213:
-                    return ts.isFunctionLike(node.parent) ? 0 : 2;
-            }
-            return 0;
-        }
-        function addToContainerChain(next) {
-            if (lastContainer) {
-                lastContainer.nextContainer = next;
-            }
-            lastContainer = next;
-        }
-        function declareSymbolAndAddToSymbolTable(node, symbolFlags, symbolExcludes) {
-            switch (container.kind) {
-                case 239:
-                    return declareModuleMember(node, symbolFlags, symbolExcludes);
-                case 274:
-                    return declareSourceFileMember(node, symbolFlags, symbolExcludes);
-                case 205:
-                case 235:
-                    return declareClassMember(node, symbolFlags, symbolExcludes);
-                case 238:
-                    return declareSymbol(container.symbol.exports, container.symbol, node, symbolFlags, symbolExcludes);
-                case 166:
-                case 287:
-                case 184:
-                case 236:
-                case 263:
-                    return declareSymbol(container.symbol.members, container.symbol, node, symbolFlags, symbolExcludes);
-                case 163:
-                case 164:
-                case 158:
-                case 159:
-                case 288:
-                case 160:
-                case 154:
-                case 153:
-                case 155:
-                case 156:
-                case 157:
-                case 234:
-                case 192:
-                case 193:
-                case 284:
-                case 297:
-                case 292:
-                case 237:
-                case 177:
-                    return declareSymbol(container.locals, undefined, node, symbolFlags, symbolExcludes);
-            }
-        }
-        function declareClassMember(node, symbolFlags, symbolExcludes) {
-            return ts.hasModifier(node, 32)
-                ? declareSymbol(container.symbol.exports, container.symbol, node, symbolFlags, symbolExcludes)
-                : declareSymbol(container.symbol.members, container.symbol, node, symbolFlags, symbolExcludes);
-        }
-        function declareSourceFileMember(node, symbolFlags, symbolExcludes) {
-            return ts.isExternalModule(file)
-                ? declareModuleMember(node, symbolFlags, symbolExcludes)
-                : declareSymbol(file.locals, undefined, node, symbolFlags, symbolExcludes);
-        }
-        function hasExportDeclarations(node) {
-            var body = node.kind === 274 ? node : node.body;
-            if (body && (body.kind === 274 || body.kind === 240)) {
-                for (var _i = 0, _a = body.statements; _i < _a.length; _i++) {
-                    var stat = _a[_i];
-                    if (stat.kind === 250 || stat.kind === 249) {
-                        return true;
-                    }
-                }
-            }
-            return false;
-        }
-        function setExportContextFlag(node) {
-            if (node.flags & 4194304 && !hasExportDeclarations(node)) {
-                node.flags |= 32;
-            }
-            else {
-                node.flags &= ~32;
-            }
-        }
-        function bindModuleDeclaration(node) {
-            setExportContextFlag(node);
-            if (ts.isAmbientModule(node)) {
-                if (ts.hasModifier(node, 1)) {
-                    errorOnFirstToken(node, ts.Diagnostics.export_modifier_cannot_be_applied_to_ambient_modules_and_module_augmentations_since_they_are_always_visible);
-                }
-                if (ts.isModuleAugmentationExternal(node)) {
-                    declareModuleSymbol(node);
-                }
-                else {
-                    var pattern = void 0;
-                    if (node.name.kind === 9) {
-                        var text = node.name.text;
-                        if (ts.hasZeroOrOneAsteriskCharacter(text)) {
-                            pattern = ts.tryParsePattern(text);
+                else if (s.charCodeAt(0) === 45 /* minus */) {
+                    var opt = getOptionFromName(s.slice(s.charCodeAt(1) === 45 /* minus */ ? 2 : 1), /*allowShort*/ true);
+                    if (opt) {
+                        if (opt.isTSConfigOnly) {
+                            errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Option_0_can_only_be_specified_in_tsconfig_json_file, opt.name));
                         }
                         else {
-                            errorOnFirstToken(node.name, ts.Diagnostics.Pattern_0_can_have_at_most_one_Asterisk_character, text);
+                            // Check to see if no argument was provided (e.g. "--locale" is the last command-line argument).
+                            if (!args[i] && opt.type !== "boolean") {
+                                errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Compiler_option_0_expects_an_argument, opt.name));
+                            }
+                            switch (opt.type) {
+                                case "number":
+                                    options[opt.name] = parseInt(args[i]);
+                                    i++;
+                                    break;
+                                case "boolean":
+                                    // boolean flag has optional value true, false, others
+                                    var optValue = args[i];
+                                    options[opt.name] = optValue !== "false";
+                                    // consume next argument as boolean flag value
+                                    if (optValue === "false" || optValue === "true") {
+                                        i++;
+                                    }
+                                    break;
+                                case "string":
+                                    options[opt.name] = args[i] || "";
+                                    i++;
+                                    break;
+                                case "list":
+                                    var result = parseListTypeOption(opt, args[i], errors);
+                                    options[opt.name] = result || [];
+                                    if (result) {
+                                        i++;
+                                    }
+                                    break;
+                                // If not a primitive, the possible types are specified in what is effectively a map of options.
+                                default:
+                                    options[opt.name] = parseCustomTypeOption(opt, args[i], errors);
+                                    i++;
+                                    break;
+                            }
                         }
                     }
-                    var symbol = declareSymbolAndAddToSymbolTable(node, 512, 67215503);
-                    file.patternAmbientModules = ts.append(file.patternAmbientModules, pattern && { pattern: pattern, symbol: symbol });
-                }
-            }
-            else {
-                var state = declareModuleSymbol(node);
-                if (state !== 0) {
-                    var symbol = node.symbol;
-                    symbol.constEnumOnlyModule = (!(symbol.flags & (16 | 32 | 256)))
-                        && state === 2
-                        && symbol.constEnumOnlyModule !== false;
-                }
-            }
-        }
-        function declareModuleSymbol(node) {
-            var state = getModuleInstanceState(node);
-            var instantiated = state !== 0;
-            declareSymbolAndAddToSymbolTable(node, instantiated ? 512 : 1024, instantiated ? 67215503 : 0);
-            return state;
-        }
-        function bindFunctionOrConstructorType(node) {
-            var symbol = createSymbol(131072, getDeclarationName(node));
-            addDeclarationToSymbol(symbol, node, 131072);
-            var typeLiteralSymbol = createSymbol(2048, "__type");
-            addDeclarationToSymbol(typeLiteralSymbol, node, 2048);
-            typeLiteralSymbol.members = ts.createSymbolTable();
-            typeLiteralSymbol.members.set(symbol.escapedName, symbol);
-        }
-        function bindObjectLiteralExpression(node) {
-            if (inStrictMode) {
-                var seen = ts.createUnderscoreEscapedMap();
-                for (var _i = 0, _a = node.properties; _i < _a.length; _i++) {
-                    var prop = _a[_i];
-                    if (prop.kind === 272 || prop.name.kind !== 71) {
-                        continue;
-                    }
-                    var identifier = prop.name;
-                    var currentKind = prop.kind === 270 || prop.kind === 271 || prop.kind === 154
-                        ? 1
-                        : 2;
-                    var existingKind = seen.get(identifier.escapedText);
-                    if (!existingKind) {
-                        seen.set(identifier.escapedText, currentKind);
-                        continue;
-                    }
-                    if (currentKind === 1 && existingKind === 1) {
-                        var span = ts.getErrorSpanForNode(file, identifier);
-                        file.bindDiagnostics.push(ts.createFileDiagnostic(file, span.start, span.length, ts.Diagnostics.An_object_literal_cannot_have_multiple_properties_with_the_same_name_in_strict_mode));
-                    }
-                }
-            }
-            return bindAnonymousDeclaration(node, 4096, "__object");
-        }
-        function bindJsxAttributes(node) {
-            return bindAnonymousDeclaration(node, 4096, "__jsxAttributes");
-        }
-        function bindJsxAttribute(node, symbolFlags, symbolExcludes) {
-            return declareSymbolAndAddToSymbolTable(node, symbolFlags, symbolExcludes);
-        }
-        function bindAnonymousDeclaration(node, symbolFlags, name) {
-            var symbol = createSymbol(symbolFlags, name);
-            if (symbolFlags & (8 | 106500)) {
-                symbol.parent = container.symbol;
-            }
-            addDeclarationToSymbol(symbol, node, symbolFlags);
-            return symbol;
-        }
-        function bindBlockScopedDeclaration(node, symbolFlags, symbolExcludes) {
-            switch (blockScopeContainer.kind) {
-                case 239:
-                    declareModuleMember(node, symbolFlags, symbolExcludes);
-                    break;
-                case 274:
-                    if (ts.isExternalOrCommonJsModule(container)) {
-                        declareModuleMember(node, symbolFlags, symbolExcludes);
-                        break;
-                    }
-                default:
-                    if (!blockScopeContainer.locals) {
-                        blockScopeContainer.locals = ts.createSymbolTable();
-                        addToContainerChain(blockScopeContainer);
-                    }
-                    declareSymbol(blockScopeContainer.locals, undefined, node, symbolFlags, symbolExcludes);
-            }
-        }
-        function bindBlockScopedVariableDeclaration(node) {
-            bindBlockScopedDeclaration(node, 2, 67216319);
-        }
-        function delayedBindJSDocTypedefTag() {
-            if (!delayedTypeAliases) {
-                return;
-            }
-            var saveContainer = container;
-            var saveLastContainer = lastContainer;
-            var saveBlockScopeContainer = blockScopeContainer;
-            var saveParent = parent;
-            var saveCurrentFlow = currentFlow;
-            for (var _i = 0, delayedTypeAliases_1 = delayedTypeAliases; _i < delayedTypeAliases_1.length; _i++) {
-                var typeAlias = delayedTypeAliases_1[_i];
-                var host = ts.getJSDocHost(typeAlias);
-                container = ts.findAncestor(host.parent, function (n) { return !!(getContainerFlags(n) & 1); }) || file;
-                blockScopeContainer = ts.getEnclosingBlockScopeContainer(host) || file;
-                currentFlow = { flags: 2 };
-                parent = typeAlias;
-                bind(typeAlias.typeExpression);
-                if (!typeAlias.fullName || typeAlias.fullName.kind === 71) {
-                    parent = typeAlias.parent;
-                    bindBlockScopedDeclaration(typeAlias, 524288, 67901928);
-                }
-                else {
-                    bind(typeAlias.fullName);
-                }
-            }
-            container = saveContainer;
-            lastContainer = saveLastContainer;
-            blockScopeContainer = saveBlockScopeContainer;
-            parent = saveParent;
-            currentFlow = saveCurrentFlow;
-        }
-        function checkStrictModeIdentifier(node) {
-            if (inStrictMode &&
-                node.originalKeywordKind >= 108 &&
-                node.originalKeywordKind <= 116 &&
-                !ts.isIdentifierName(node) &&
-                !(node.flags & 4194304)) {
-                if (!file.parseDiagnostics.length) {
-                    file.bindDiagnostics.push(createDiagnosticForNode(node, getStrictModeIdentifierMessage(node), ts.declarationNameToString(node)));
-                }
-            }
-        }
-        function getStrictModeIdentifierMessage(node) {
-            if (ts.getContainingClass(node)) {
-                return ts.Diagnostics.Identifier_expected_0_is_a_reserved_word_in_strict_mode_Class_definitions_are_automatically_in_strict_mode;
-            }
-            if (file.externalModuleIndicator) {
-                return ts.Diagnostics.Identifier_expected_0_is_a_reserved_word_in_strict_mode_Modules_are_automatically_in_strict_mode;
-            }
-            return ts.Diagnostics.Identifier_expected_0_is_a_reserved_word_in_strict_mode;
-        }
-        function checkStrictModeBinaryExpression(node) {
-            if (inStrictMode && ts.isLeftHandSideExpression(node.left) && ts.isAssignmentOperator(node.operatorToken.kind)) {
-                checkStrictModeEvalOrArguments(node, node.left);
-            }
-        }
-        function checkStrictModeCatchClause(node) {
-            if (inStrictMode && node.variableDeclaration) {
-                checkStrictModeEvalOrArguments(node, node.variableDeclaration.name);
-            }
-        }
-        function checkStrictModeDeleteExpression(node) {
-            if (inStrictMode && node.expression.kind === 71) {
-                var span = ts.getErrorSpanForNode(file, node.expression);
-                file.bindDiagnostics.push(ts.createFileDiagnostic(file, span.start, span.length, ts.Diagnostics.delete_cannot_be_called_on_an_identifier_in_strict_mode));
-            }
-        }
-        function isEvalOrArgumentsIdentifier(node) {
-            return ts.isIdentifier(node) && (node.escapedText === "eval" || node.escapedText === "arguments");
-        }
-        function checkStrictModeEvalOrArguments(contextNode, name) {
-            if (name && name.kind === 71) {
-                var identifier = name;
-                if (isEvalOrArgumentsIdentifier(identifier)) {
-                    var span = ts.getErrorSpanForNode(file, name);
-                    file.bindDiagnostics.push(ts.createFileDiagnostic(file, span.start, span.length, getStrictModeEvalOrArgumentsMessage(contextNode), ts.idText(identifier)));
-                }
-            }
-        }
-        function getStrictModeEvalOrArgumentsMessage(node) {
-            if (ts.getContainingClass(node)) {
-                return ts.Diagnostics.Invalid_use_of_0_Class_definitions_are_automatically_in_strict_mode;
-            }
-            if (file.externalModuleIndicator) {
-                return ts.Diagnostics.Invalid_use_of_0_Modules_are_automatically_in_strict_mode;
-            }
-            return ts.Diagnostics.Invalid_use_of_0_in_strict_mode;
-        }
-        function checkStrictModeFunctionName(node) {
-            if (inStrictMode) {
-                checkStrictModeEvalOrArguments(node, node.name);
-            }
-        }
-        function getStrictModeBlockScopeFunctionDeclarationMessage(node) {
-            if (ts.getContainingClass(node)) {
-                return ts.Diagnostics.Function_declarations_are_not_allowed_inside_blocks_in_strict_mode_when_targeting_ES3_or_ES5_Class_definitions_are_automatically_in_strict_mode;
-            }
-            if (file.externalModuleIndicator) {
-                return ts.Diagnostics.Function_declarations_are_not_allowed_inside_blocks_in_strict_mode_when_targeting_ES3_or_ES5_Modules_are_automatically_in_strict_mode;
-            }
-            return ts.Diagnostics.Function_declarations_are_not_allowed_inside_blocks_in_strict_mode_when_targeting_ES3_or_ES5;
-        }
-        function checkStrictModeFunctionDeclaration(node) {
-            if (languageVersion < 2) {
-                if (blockScopeContainer.kind !== 274 &&
-                    blockScopeContainer.kind !== 239 &&
-                    !ts.isFunctionLike(blockScopeContainer)) {
-                    var errorSpan = ts.getErrorSpanForNode(file, node);
-                    file.bindDiagnostics.push(ts.createFileDiagnostic(file, errorSpan.start, errorSpan.length, getStrictModeBlockScopeFunctionDeclarationMessage(node)));
-                }
-            }
-        }
-        function checkStrictModeNumericLiteral(node) {
-            if (inStrictMode && node.numericLiteralFlags & 32) {
-                file.bindDiagnostics.push(createDiagnosticForNode(node, ts.Diagnostics.Octal_literals_are_not_allowed_in_strict_mode));
-            }
-        }
-        function checkStrictModePostfixUnaryExpression(node) {
-            if (inStrictMode) {
-                checkStrictModeEvalOrArguments(node, node.operand);
-            }
-        }
-        function checkStrictModePrefixUnaryExpression(node) {
-            if (inStrictMode) {
-                if (node.operator === 43 || node.operator === 44) {
-                    checkStrictModeEvalOrArguments(node, node.operand);
-                }
-            }
-        }
-        function checkStrictModeWithStatement(node) {
-            if (inStrictMode) {
-                errorOnFirstToken(node, ts.Diagnostics.with_statements_are_not_allowed_in_strict_mode);
-            }
-        }
-        function errorOnFirstToken(node, message, arg0, arg1, arg2) {
-            var span = ts.getSpanOfTokenAtPosition(file, node.pos);
-            file.bindDiagnostics.push(ts.createFileDiagnostic(file, span.start, span.length, message, arg0, arg1, arg2));
-        }
-        function errorOrSuggestionOnFirstToken(isError, node, message, arg0, arg1, arg2) {
-            var span = ts.getSpanOfTokenAtPosition(file, node.pos);
-            var diag = ts.createFileDiagnostic(file, span.start, span.length, message, arg0, arg1, arg2);
-            if (isError) {
-                file.bindDiagnostics.push(diag);
-            }
-            else {
-                file.bindSuggestionDiagnostics = ts.append(file.bindSuggestionDiagnostics, __assign({}, diag, { category: ts.DiagnosticCategory.Suggestion }));
-            }
-        }
-        function bind(node) {
-            if (!node) {
-                return;
-            }
-            node.parent = parent;
-            var saveInStrictMode = inStrictMode;
-            bindWorker(node);
-            if (node.kind > 145) {
-                var saveParent = parent;
-                parent = node;
-                var containerFlags = getContainerFlags(node);
-                if (containerFlags === 0) {
-                    bindChildren(node);
-                }
-                else {
-                    bindContainer(node, containerFlags);
-                }
-                parent = saveParent;
-            }
-            else if (!skipTransformFlagAggregation && (node.transformFlags & 536870912) === 0) {
-                subtreeTransformFlags |= computeTransformFlagsForNode(node, 0);
-                bindJSDoc(node);
-            }
-            inStrictMode = saveInStrictMode;
-        }
-        function bindJSDoc(node) {
-            if (ts.hasJSDocNodes(node)) {
-                if (ts.isInJavaScriptFile(node)) {
-                    for (var _i = 0, _a = node.jsDoc; _i < _a.length; _i++) {
-                        var j = _a[_i];
-                        bind(j);
-                    }
-                }
-                else {
-                    for (var _b = 0, _c = node.jsDoc; _b < _c.length; _b++) {
-                        var j = _c[_b];
-                        setParentPointers(node, j);
-                    }
-                }
-            }
-        }
-        function updateStrictModeStatementList(statements) {
-            if (!inStrictMode) {
-                for (var _i = 0, statements_1 = statements; _i < statements_1.length; _i++) {
-                    var statement = statements_1[_i];
-                    if (!ts.isPrologueDirective(statement)) {
-                        return;
-                    }
-                    if (isUseStrictPrologueDirective(statement)) {
-                        inStrictMode = true;
-                        return;
-                    }
-                }
-            }
-        }
-        function isUseStrictPrologueDirective(node) {
-            var nodeText = ts.getSourceTextOfNodeFromSourceFile(file, node.expression);
-            return nodeText === '"use strict"' || nodeText === "'use strict'";
-        }
-        function bindWorker(node) {
-            switch (node.kind) {
-                case 71:
-                    if (node.isInJSDocNamespace) {
-                        var parentNode = node.parent;
-                        while (parentNode && !ts.isJSDocTypeAlias(parentNode)) {
-                            parentNode = parentNode.parent;
-                        }
-                        bindBlockScopedDeclaration(parentNode, 524288, 67901928);
-                        break;
-                    }
-                case 99:
-                    if (currentFlow && (ts.isExpression(node) || parent.kind === 271)) {
-                        node.flowNode = currentFlow;
-                    }
-                    return checkStrictModeIdentifier(node);
-                case 185:
-                    if (currentFlow && isNarrowableReference(node)) {
-                        node.flowNode = currentFlow;
-                    }
-                    if (ts.isSpecialPropertyDeclaration(node)) {
-                        bindSpecialPropertyDeclaration(node);
-                    }
-                    break;
-                case 200:
-                    var specialKind = ts.getSpecialPropertyAssignmentKind(node);
-                    switch (specialKind) {
-                        case 1:
-                            bindExportsPropertyAssignment(node);
-                            break;
-                        case 2:
-                            bindModuleExportsAssignment(node);
-                            break;
-                        case 3:
-                            bindPrototypePropertyAssignment(node.left, node);
-                            break;
-                        case 6:
-                            bindPrototypeAssignment(node);
-                            break;
-                        case 4:
-                            bindThisPropertyAssignment(node);
-                            break;
-                        case 5:
-                            bindSpecialPropertyAssignment(node);
-                            break;
-                        case 0:
-                            break;
-                        default:
-                            ts.Debug.fail("Unknown special property assignment kind");
-                    }
-                    return checkStrictModeBinaryExpression(node);
-                case 269:
-                    return checkStrictModeCatchClause(node);
-                case 194:
-                    return checkStrictModeDeleteExpression(node);
-                case 8:
-                    return checkStrictModeNumericLiteral(node);
-                case 199:
-                    return checkStrictModePostfixUnaryExpression(node);
-                case 198:
-                    return checkStrictModePrefixUnaryExpression(node);
-                case 226:
-                    return checkStrictModeWithStatement(node);
-                case 174:
-                    seenThisKeyword = true;
-                    return;
-                case 161:
-                    break;
-                case 148:
-                    return bindTypeParameter(node);
-                case 149:
-                    return bindParameter(node);
-                case 232:
-                    return bindVariableDeclarationOrBindingElement(node);
-                case 182:
-                    node.flowNode = currentFlow;
-                    return bindVariableDeclarationOrBindingElement(node);
-                case 152:
-                case 151:
-                    return bindPropertyWorker(node);
-                case 270:
-                case 271:
-                    return bindPropertyOrMethodOrAccessor(node, 4, 0);
-                case 273:
-                    return bindPropertyOrMethodOrAccessor(node, 8, 68008959);
-                case 158:
-                case 159:
-                case 160:
-                    return declareSymbolAndAddToSymbolTable(node, 131072, 0);
-                case 154:
-                case 153:
-                    return bindPropertyOrMethodOrAccessor(node, 8192 | (node.questionToken ? 16777216 : 0), ts.isObjectLiteralMethod(node) ? 0 : 67208127);
-                case 234:
-                    return bindFunctionDeclaration(node);
-                case 155:
-                    return declareSymbolAndAddToSymbolTable(node, 16384, 0);
-                case 156:
-                    return bindPropertyOrMethodOrAccessor(node, 32768, 67150783);
-                case 157:
-                    return bindPropertyOrMethodOrAccessor(node, 65536, 67183551);
-                case 163:
-                case 284:
-                case 288:
-                case 164:
-                    return bindFunctionOrConstructorType(node);
-                case 166:
-                case 287:
-                case 177:
-                    return bindAnonymousTypeWorker(node);
-                case 184:
-                    return bindObjectLiteralExpression(node);
-                case 192:
-                case 193:
-                    return bindFunctionExpression(node);
-                case 187:
-                    if (ts.isInJavaScriptFile(node)) {
-                        bindCallExpression(node);
-                    }
-                    break;
-                case 205:
-                case 235:
-                    inStrictMode = true;
-                    return bindClassLikeDeclaration(node);
-                case 236:
-                    return bindBlockScopedDeclaration(node, 64, 67901832);
-                case 237:
-                    return bindBlockScopedDeclaration(node, 524288, 67901928);
-                case 238:
-                    return bindEnumDeclaration(node);
-                case 239:
-                    return bindModuleDeclaration(node);
-                case 263:
-                    return bindJsxAttributes(node);
-                case 262:
-                    return bindJsxAttribute(node, 4, 0);
-                case 243:
-                case 246:
-                case 248:
-                case 252:
-                    return declareSymbolAndAddToSymbolTable(node, 2097152, 2097152);
-                case 242:
-                    return bindNamespaceExportDeclaration(node);
-                case 245:
-                    return bindImportClause(node);
-                case 250:
-                    return bindExportDeclaration(node);
-                case 249:
-                    return bindExportAssignment(node);
-                case 274:
-                    updateStrictModeStatementList(node.statements);
-                    return bindSourceFileIfExternalModule();
-                case 213:
-                    if (!ts.isFunctionLike(node.parent)) {
-                        return;
-                    }
-                case 240:
-                    return updateStrictModeStatementList(node.statements);
-                case 293:
-                    if (node.parent.kind === 288) {
-                        return bindParameter(node);
-                    }
-                    if (node.parent.kind !== 287) {
-                        break;
-                    }
-                case 298:
-                    var propTag = node;
-                    var flags = propTag.isBracketed || propTag.typeExpression && propTag.typeExpression.type.kind === 283 ?
-                        4 | 16777216 :
-                        4;
-                    return declareSymbolAndAddToSymbolTable(propTag, flags, 0);
-                case 297:
-                case 292:
-                    return (delayedTypeAliases || (delayedTypeAliases = [])).push(node);
-            }
-        }
-        function bindPropertyWorker(node) {
-            return bindPropertyOrMethodOrAccessor(node, 4 | (node.questionToken ? 16777216 : 0), 0);
-        }
-        function bindAnonymousTypeWorker(node) {
-            return bindAnonymousDeclaration(node, 2048, "__type");
-        }
-        function bindSourceFileIfExternalModule() {
-            setExportContextFlag(file);
-            if (ts.isExternalModule(file)) {
-                bindSourceFileAsExternalModule();
-            }
-            else if (ts.isJsonSourceFile(file)) {
-                bindSourceFileAsExternalModule();
-                var originalSymbol = file.symbol;
-                declareSymbol(file.symbol.exports, file.symbol, file, 4, 67108863);
-                file.symbol = originalSymbol;
-            }
-        }
-        function bindSourceFileAsExternalModule() {
-            bindAnonymousDeclaration(file, 512, "\"" + ts.removeFileExtension(file.fileName) + "\"");
-        }
-        function bindExportAssignment(node) {
-            if (!container.symbol || !container.symbol.exports) {
-                bindAnonymousDeclaration(node, 2097152, getDeclarationName(node));
-            }
-            else {
-                var flags = node.kind === 249 && ts.exportAssignmentIsAlias(node)
-                    ? 2097152
-                    : 4;
-                declareSymbol(container.symbol.exports, container.symbol, node, flags, 67108863);
-            }
-        }
-        function bindNamespaceExportDeclaration(node) {
-            if (node.modifiers && node.modifiers.length) {
-                file.bindDiagnostics.push(createDiagnosticForNode(node, ts.Diagnostics.Modifiers_cannot_appear_here));
-            }
-            if (node.parent.kind !== 274) {
-                file.bindDiagnostics.push(createDiagnosticForNode(node, ts.Diagnostics.Global_module_exports_may_only_appear_at_top_level));
-                return;
-            }
-            else {
-                var parent_1 = node.parent;
-                if (!ts.isExternalModule(parent_1)) {
-                    file.bindDiagnostics.push(createDiagnosticForNode(node, ts.Diagnostics.Global_module_exports_may_only_appear_in_module_files));
-                    return;
-                }
-                if (!parent_1.isDeclarationFile) {
-                    file.bindDiagnostics.push(createDiagnosticForNode(node, ts.Diagnostics.Global_module_exports_may_only_appear_in_declaration_files));
-                    return;
-                }
-            }
-            file.symbol.globalExports = file.symbol.globalExports || ts.createSymbolTable();
-            declareSymbol(file.symbol.globalExports, file.symbol, node, 2097152, 2097152);
-        }
-        function bindExportDeclaration(node) {
-            if (!container.symbol || !container.symbol.exports) {
-                bindAnonymousDeclaration(node, 8388608, getDeclarationName(node));
-            }
-            else if (!node.exportClause) {
-                declareSymbol(container.symbol.exports, container.symbol, node, 8388608, 0);
-            }
-        }
-        function bindImportClause(node) {
-            if (node.name) {
-                declareSymbolAndAddToSymbolTable(node, 2097152, 2097152);
-            }
-        }
-        function setCommonJsModuleIndicator(node) {
-            if (!file.commonJsModuleIndicator) {
-                file.commonJsModuleIndicator = node;
-                if (!file.externalModuleIndicator) {
-                    bindSourceFileAsExternalModule();
-                }
-            }
-        }
-        function bindExportsPropertyAssignment(node) {
-            setCommonJsModuleIndicator(node);
-            var lhs = node.left;
-            var symbol = forEachIdentifierInEntityName(lhs.expression, undefined, function (id, symbol) {
-                if (symbol) {
-                    addDeclarationToSymbol(symbol, id, 1536 | 67108864);
-                }
-                return symbol;
-            });
-            if (symbol) {
-                var flags = ts.isClassExpression(node.right) ?
-                    4 | 1048576 | 32 :
-                    4 | 1048576;
-                declareSymbol(symbol.exports, symbol, lhs, flags, 0);
-            }
-        }
-        function bindModuleExportsAssignment(node) {
-            var assignedExpression = ts.getRightMostAssignedExpression(node.right);
-            if (ts.isEmptyObjectLiteral(assignedExpression) || container === file && isExportsOrModuleExportsOrAlias(file, assignedExpression)) {
-                setCommonJsModuleIndicator(node);
-                return;
-            }
-            setCommonJsModuleIndicator(node);
-            var flags = ts.exportAssignmentIsAlias(node)
-                ? 2097152
-                : 4 | 1048576 | 512;
-            declareSymbol(file.symbol.exports, file.symbol, node, flags, 0);
-        }
-        function bindThisPropertyAssignment(node) {
-            ts.Debug.assert(ts.isInJavaScriptFile(node));
-            var thisContainer = ts.getThisContainer(node, false);
-            switch (thisContainer.kind) {
-                case 234:
-                case 192:
-                    var constructorSymbol = thisContainer.symbol;
-                    if (ts.isBinaryExpression(thisContainer.parent) && thisContainer.parent.operatorToken.kind === 58) {
-                        var l = thisContainer.parent.left;
-                        if (ts.isPropertyAccessEntityNameExpression(l) && ts.isPrototypeAccess(l.expression)) {
-                            constructorSymbol = lookupSymbolForPropertyAccess(l.expression.expression, thisParentContainer);
-                        }
-                    }
-                    if (constructorSymbol) {
-                        constructorSymbol.members = constructorSymbol.members || ts.createSymbolTable();
-                        declareSymbol(constructorSymbol.members, constructorSymbol, node, 4, 0 & ~4);
-                    }
-                    break;
-                case 155:
-                case 152:
-                case 154:
-                case 156:
-                case 157:
-                    var containingClass = thisContainer.parent;
-                    var symbolTable = ts.hasModifier(thisContainer, 32) ? containingClass.symbol.exports : containingClass.symbol.members;
-                    declareSymbol(symbolTable, containingClass.symbol, node, 4, 0, true);
-                    break;
-                case 274:
-                    break;
-                default:
-                    ts.Debug.fail(ts.Debug.showSyntaxKind(thisContainer));
-            }
-        }
-        function bindSpecialPropertyDeclaration(node) {
-            if (node.expression.kind === 99) {
-                bindThisPropertyAssignment(node);
-            }
-            else if (ts.isPropertyAccessEntityNameExpression(node) && node.parent.parent.kind === 274) {
-                if (ts.isPrototypeAccess(node.expression)) {
-                    bindPrototypePropertyAssignment(node, node.parent);
-                }
-                else {
-                    bindStaticPropertyAssignment(node);
-                }
-            }
-        }
-        function bindPrototypeAssignment(node) {
-            node.left.parent = node;
-            node.right.parent = node;
-            var lhs = node.left;
-            bindPropertyAssignment(lhs, lhs, false);
-        }
-        function bindPrototypePropertyAssignment(lhs, parent) {
-            var classPrototype = lhs.expression;
-            var constructorFunction = classPrototype.expression;
-            lhs.parent = parent;
-            constructorFunction.parent = classPrototype;
-            classPrototype.parent = lhs;
-            bindPropertyAssignment(constructorFunction, lhs, true);
-        }
-        function bindSpecialPropertyAssignment(node) {
-            var lhs = node.left;
-            node.left.parent = node;
-            node.right.parent = node;
-            if (ts.isIdentifier(lhs.expression) && container === file && isNameOfExportsOrModuleExportsAliasDeclaration(file, lhs.expression)) {
-                bindExportsPropertyAssignment(node);
-            }
-            else {
-                bindStaticPropertyAssignment(lhs);
-            }
-        }
-        function bindStaticPropertyAssignment(node) {
-            node.expression.parent = node;
-            bindPropertyAssignment(node.expression, node, false);
-        }
-        function bindPropertyAssignment(name, propertyAccess, isPrototypeProperty) {
-            var namespaceSymbol = lookupSymbolForPropertyAccess(name);
-            var isToplevelNamespaceableInitializer = ts.isBinaryExpression(propertyAccess.parent)
-                ? getParentOfBinaryExpression(propertyAccess.parent).parent.kind === 274 &&
-                    !!ts.getJavascriptInitializer(ts.getInitializerOfBinaryExpression(propertyAccess.parent), ts.isPrototypeAccess(propertyAccess.parent.left))
-                : propertyAccess.parent.parent.kind === 274;
-            if (!isPrototypeProperty && (!namespaceSymbol || !(namespaceSymbol.flags & 1920)) && isToplevelNamespaceableInitializer) {
-                var flags_1 = 1536 | 67108864;
-                var excludeFlags_1 = 67215503 & ~67108864;
-                namespaceSymbol = forEachIdentifierInEntityName(propertyAccess.expression, namespaceSymbol, function (id, symbol, parent) {
-                    if (symbol) {
-                        addDeclarationToSymbol(symbol, id, flags_1);
-                        return symbol;
-                    }
                     else {
-                        return declareSymbol(parent ? parent.exports : container.locals, parent, id, flags_1, excludeFlags_1);
+                        errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Unknown_compiler_option_0, s));
                     }
-                });
+                }
+                else {
+                    fileNames.push(s);
+                }
             }
-            if (!namespaceSymbol || !isJavascriptContainer(namespaceSymbol)) {
+        }
+        function parseResponseFile(fileName) {
+            var text = readFile ? readFile(fileName) : ts.sys.readFile(fileName);
+            if (!text) {
+                errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.File_0_not_found, fileName));
                 return;
             }
-            var symbolTable = isPrototypeProperty ?
-                (namespaceSymbol.members || (namespaceSymbol.members = ts.createSymbolTable())) :
-                (namespaceSymbol.exports || (namespaceSymbol.exports = ts.createSymbolTable()));
-            var jsContainerFlag = isToplevelNamespaceableInitializer ? 67108864 : 0;
-            var isMethod = ts.isFunctionLikeDeclaration(ts.getAssignedJavascriptInitializer(propertyAccess));
-            var symbolFlags = (isMethod ? 8192 : 4) | jsContainerFlag;
-            var symbolExcludes = (isMethod ? 67208127 : 0) & ~jsContainerFlag;
-            declareSymbol(symbolTable, namespaceSymbol, propertyAccess, symbolFlags, symbolExcludes);
+            var args = [];
+            var pos = 0;
+            while (true) {
+                while (pos < text.length && text.charCodeAt(pos) <= 32 /* space */)
+                    pos++;
+                if (pos >= text.length)
+                    break;
+                var start = pos;
+                if (text.charCodeAt(start) === 34 /* doubleQuote */) {
+                    pos++;
+                    while (pos < text.length && text.charCodeAt(pos) !== 34 /* doubleQuote */)
+                        pos++;
+                    if (pos < text.length) {
+                        args.push(text.substring(start + 1, pos));
+                        pos++;
+                    }
+                    else {
+                        errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Unterminated_quoted_string_in_response_file_0, fileName));
+                    }
+                }
+                else {
+                    while (text.charCodeAt(pos) > 32 /* space */)
+                        pos++;
+                    args.push(text.substring(start, pos));
+                }
+            }
+            parseStrings(args);
         }
-        function isJavascriptContainer(symbol) {
-            if (symbol.flags & (16 | 32 | 1024)) {
-                return true;
+    }
+    ts.parseCommandLine = parseCommandLine;
+    /** @internal */
+    function getOptionFromName(optionName, allowShort) {
+        if (allowShort === void 0) { allowShort = false; }
+        optionName = optionName.toLowerCase();
+        var _a = getOptionNameMap(), optionNameMap = _a.optionNameMap, shortOptionNames = _a.shortOptionNames;
+        // Try to translate short option names to their full equivalents.
+        if (allowShort) {
+            var short = shortOptionNames.get(optionName);
+            if (short !== undefined) {
+                optionName = short;
             }
-            var node = symbol.valueDeclaration;
-            var init = !node ? undefined :
-                ts.isVariableDeclaration(node) ? node.initializer :
-                    ts.isBinaryExpression(node) ? node.right :
-                        ts.isPropertyAccessExpression(node) && ts.isBinaryExpression(node.parent) ? node.parent.right :
-                            undefined;
-            if (init) {
-                var isPrototypeAssignment = ts.isPrototypeAccess(ts.isVariableDeclaration(node) ? node.name : ts.isBinaryExpression(node) ? node.left : node);
-                return !!ts.getJavascriptInitializer(ts.isBinaryExpression(init) && init.operatorToken.kind === 54 ? init.right : init, isPrototypeAssignment);
+        }
+        return optionNameMap.get(optionName);
+    }
+    ts.getOptionFromName = getOptionFromName;
+    function getDiagnosticText(_message) {
+        var _args = [];
+        for (var _i = 1; _i < arguments.length; _i++) {
+            _args[_i - 1] = arguments[_i];
+        }
+        var diagnostic = ts.createCompilerDiagnostic.apply(undefined, arguments);
+        return diagnostic.messageText;
+    }
+    /* @internal */
+    function printVersion() {
+        ts.sys.write(getDiagnosticText(ts.Diagnostics.Version_0, ts.version) + ts.sys.newLine);
+    }
+    ts.printVersion = printVersion;
+    /* @internal */
+    function printHelp(optionsList, syntaxPrefix) {
+        if (syntaxPrefix === void 0) { syntaxPrefix = ""; }
+        var output = [];
+        // We want to align our "syntax" and "examples" commands to a certain margin.
+        var syntaxLength = getDiagnosticText(ts.Diagnostics.Syntax_Colon_0, "").length;
+        var examplesLength = getDiagnosticText(ts.Diagnostics.Examples_Colon_0, "").length;
+        var marginLength = Math.max(syntaxLength, examplesLength);
+        // Build up the syntactic skeleton.
+        var syntax = makePadding(marginLength - syntaxLength);
+        syntax += "tsc " + syntaxPrefix + "[" + getDiagnosticText(ts.Diagnostics.options) + "] [" + getDiagnosticText(ts.Diagnostics.file) + "...]";
+        output.push(getDiagnosticText(ts.Diagnostics.Syntax_Colon_0, syntax));
+        output.push(ts.sys.newLine + ts.sys.newLine);
+        // Build up the list of examples.
+        var padding = makePadding(marginLength);
+        output.push(getDiagnosticText(ts.Diagnostics.Examples_Colon_0, makePadding(marginLength - examplesLength) + "tsc hello.ts") + ts.sys.newLine);
+        output.push(padding + "tsc --outFile file.js file.ts" + ts.sys.newLine);
+        output.push(padding + "tsc @args.txt" + ts.sys.newLine);
+        output.push(padding + "tsc --build tsconfig.json" + ts.sys.newLine);
+        output.push(ts.sys.newLine);
+        output.push(getDiagnosticText(ts.Diagnostics.Options_Colon) + ts.sys.newLine);
+        // We want our descriptions to align at the same column in our output,
+        // so we keep track of the longest option usage string.
+        marginLength = 0;
+        var usageColumn = []; // Things like "-d, --declaration" go in here.
+        var descriptionColumn = [];
+        var optionsDescriptionMap = ts.createMap(); // Map between option.description and list of option.type if it is a kind
+        for (var _i = 0, optionsList_1 = optionsList; _i < optionsList_1.length; _i++) {
+            var option = optionsList_1[_i];
+            // If an option lacks a description,
+            // it is not officially supported.
+            if (!option.description) {
+                continue;
             }
+            var usageText_1 = " ";
+            if (option.shortName) {
+                usageText_1 += "-" + option.shortName;
+                usageText_1 += getParamType(option);
+                usageText_1 += ", ";
+            }
+            usageText_1 += "--" + option.name;
+            usageText_1 += getParamType(option);
+            usageColumn.push(usageText_1);
+            var description = void 0;
+            if (option.name === "lib") {
+                description = getDiagnosticText(option.description);
+                var element = option.element;
+                var typeMap = element.type;
+                optionsDescriptionMap.set(description, ts.arrayFrom(typeMap.keys()).map(function (key) { return "'" + key + "'"; }));
+            }
+            else {
+                description = getDiagnosticText(option.description);
+            }
+            descriptionColumn.push(description);
+            // Set the new margin for the description column if necessary.
+            marginLength = Math.max(usageText_1.length, marginLength);
+        }
+        // Special case that can't fit in the loop.
+        var usageText = " @<" + getDiagnosticText(ts.Diagnostics.file) + ">";
+        usageColumn.push(usageText);
+        descriptionColumn.push(getDiagnosticText(ts.Diagnostics.Insert_command_line_options_and_files_from_a_file));
+        marginLength = Math.max(usageText.length, marginLength);
+        // Print out each row, aligning all the descriptions on the same column.
+        for (var i = 0; i < usageColumn.length; i++) {
+            var usage = usageColumn[i];
+            var description = descriptionColumn[i];
+            var kindsList = optionsDescriptionMap.get(description);
+            output.push(usage + makePadding(marginLength - usage.length + 2) + description + ts.sys.newLine);
+            if (kindsList) {
+                output.push(makePadding(marginLength + 4));
+                for (var _a = 0, kindsList_1 = kindsList; _a < kindsList_1.length; _a++) {
+                    var kind = kindsList_1[_a];
+                    output.push(kind + " ");
+                }
+                output.push(ts.sys.newLine);
+            }
+        }
+        for (var _b = 0, output_1 = output; _b < output_1.length; _b++) {
+            var line = output_1[_b];
+            ts.sys.write(line);
+        }
+        return;
+        function getParamType(option) {
+            if (option.paramType !== undefined) {
+                return " " + getDiagnosticText(option.paramType);
+            }
+            return "";
+        }
+        function makePadding(paddingLength) {
+            return Array(paddingLength + 1).join(" ");
+        }
+    }
+    ts.printHelp = printHelp;
+    /**
+     * Reads the config file, reports errors if any and exits if the config file cannot be found
+     */
+    function getParsedCommandLineOfConfigFile(configFileName, optionsToExtend, host) {
+        var configFileText;
+        try {
+            configFileText = host.readFile(configFileName);
+        }
+        catch (e) {
+            var error = ts.createCompilerDiagnostic(ts.Diagnostics.Cannot_read_file_0_Colon_1, configFileName, e.message);
+            host.onUnRecoverableConfigFileDiagnostic(error);
+            return undefined;
+        }
+        if (!configFileText) {
+            var error = ts.createCompilerDiagnostic(ts.Diagnostics.File_0_not_found, configFileName);
+            host.onUnRecoverableConfigFileDiagnostic(error);
+            return undefined;
+        }
+        var result = ts.parseJsonText(configFileName, configFileText);
+        var cwd = host.getCurrentDirectory();
+        return parseJsonSourceFileConfigFileContent(result, host, ts.getNormalizedAbsolutePath(ts.getDirectoryPath(configFileName), cwd), optionsToExtend, ts.getNormalizedAbsolutePath(configFileName, cwd));
+    }
+    ts.getParsedCommandLineOfConfigFile = getParsedCommandLineOfConfigFile;
+    /**
+     * Read tsconfig.json file
+     * @param fileName The path to the config file
+     */
+    function readConfigFile(fileName, readFile) {
+        var textOrDiagnostic = tryReadFile(fileName, readFile);
+        return ts.isString(textOrDiagnostic) ? parseConfigFileTextToJson(fileName, textOrDiagnostic) : { config: {}, error: textOrDiagnostic };
+    }
+    ts.readConfigFile = readConfigFile;
+    /**
+     * Parse the text of the tsconfig.json file
+     * @param fileName The path to the config file
+     * @param jsonText The text of the config file
+     */
+    function parseConfigFileTextToJson(fileName, jsonText) {
+        var jsonSourceFile = ts.parseJsonText(fileName, jsonText);
+        return {
+            config: convertToObject(jsonSourceFile, jsonSourceFile.parseDiagnostics),
+            error: jsonSourceFile.parseDiagnostics.length ? jsonSourceFile.parseDiagnostics[0] : undefined
+        };
+    }
+    ts.parseConfigFileTextToJson = parseConfigFileTextToJson;
+    /**
+     * Read tsconfig.json file
+     * @param fileName The path to the config file
+     */
+    function readJsonConfigFile(fileName, readFile) {
+        var textOrDiagnostic = tryReadFile(fileName, readFile);
+        return ts.isString(textOrDiagnostic) ? ts.parseJsonText(fileName, textOrDiagnostic) : { parseDiagnostics: [textOrDiagnostic] };
+    }
+    ts.readJsonConfigFile = readJsonConfigFile;
+    function tryReadFile(fileName, readFile) {
+        var text;
+        try {
+            text = readFile(fileName);
+        }
+        catch (e) {
+            return ts.createCompilerDiagnostic(ts.Diagnostics.Cannot_read_file_0_Colon_1, fileName, e.message);
+        }
+        return text === undefined ? ts.createCompilerDiagnostic(ts.Diagnostics.The_specified_path_does_not_exist_Colon_0, fileName) : text;
+    }
+    function commandLineOptionsToMap(options) {
+        return ts.arrayToMap(options, function (option) { return option.name; });
+    }
+    var _tsconfigRootOptions;
+    function getTsconfigRootOptionsMap() {
+        if (_tsconfigRootOptions === undefined) {
+            _tsconfigRootOptions = {
+                name: undefined,
+                type: "object",
+                elementOptions: commandLineOptionsToMap([
+                    {
+                        name: "compilerOptions",
+                        type: "object",
+                        elementOptions: commandLineOptionsToMap(ts.optionDeclarations),
+                        extraKeyDiagnosticMessage: ts.Diagnostics.Unknown_compiler_option_0
+                    },
+                    {
+                        name: "typingOptions",
+                        type: "object",
+                        elementOptions: commandLineOptionsToMap(ts.typeAcquisitionDeclarations),
+                        extraKeyDiagnosticMessage: ts.Diagnostics.Unknown_type_acquisition_option_0
+                    },
+                    {
+                        name: "typeAcquisition",
+                        type: "object",
+                        elementOptions: commandLineOptionsToMap(ts.typeAcquisitionDeclarations),
+                        extraKeyDiagnosticMessage: ts.Diagnostics.Unknown_type_acquisition_option_0
+                    },
+                    {
+                        name: "extends",
+                        type: "string"
+                    },
+                    {
+                        name: "references",
+                        type: "list",
+                        element: {
+                            name: "references",
+                            type: "object"
+                        }
+                    },
+                    {
+                        name: "files",
+                        type: "list",
+                        element: {
+                            name: "files",
+                            type: "string"
+                        }
+                    },
+                    {
+                        name: "include",
+                        type: "list",
+                        element: {
+                            name: "include",
+                            type: "string"
+                        }
+                    },
+                    {
+                        name: "exclude",
+                        type: "list",
+                        element: {
+                            name: "exclude",
+                            type: "string"
+                        }
+                    },
+                    ts.compileOnSaveCommandLineOption
+                ])
+            };
+        }
+        return _tsconfigRootOptions;
+    }
+    /**
+     * Convert the json syntax tree into the json value
+     */
+    function convertToObject(sourceFile, errors) {
+        return convertToObjectWorker(sourceFile, errors, /*returnValue*/ true, /*knownRootOptions*/ undefined, /*jsonConversionNotifier*/ undefined);
+    }
+    ts.convertToObject = convertToObject;
+    /**
+     * Convert the json syntax tree into the json value and report errors
+     * This returns the json value (apart from checking errors) only if returnValue provided is true.
+     * Otherwise it just checks the errors and returns undefined
+     */
+    /*@internal*/
+    function convertToObjectWorker(sourceFile, errors, returnValue, knownRootOptions, jsonConversionNotifier) {
+        if (!sourceFile.statements.length) {
+            return returnValue ? {} : undefined;
+        }
+        return convertPropertyValueToJson(sourceFile.statements[0].expression, knownRootOptions);
+        function isRootOptionMap(knownOptions) {
+            return knownRootOptions && knownRootOptions.elementOptions === knownOptions;
+        }
+        function convertObjectLiteralExpressionToJson(node, knownOptions, extraKeyDiagnosticMessage, parentOption) {
+            var result = returnValue ? {} : undefined;
+            for (var _i = 0, _a = node.properties; _i < _a.length; _i++) {
+                var element = _a[_i];
+                if (element.kind !== 270 /* PropertyAssignment */) {
+                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, element, ts.Diagnostics.Property_assignment_expected));
+                    continue;
+                }
+                if (element.questionToken) {
+                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, element.questionToken, ts.Diagnostics._0_can_only_be_used_in_a_ts_file, "?"));
+                }
+                if (!isDoubleQuotedString(element.name)) {
+                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, element.name, ts.Diagnostics.String_literal_with_double_quotes_expected));
+                }
+                var keyText = ts.unescapeLeadingUnderscores(ts.getTextOfPropertyName(element.name));
+                var option = knownOptions ? knownOptions.get(keyText) : undefined;
+                if (extraKeyDiagnosticMessage && !option) {
+                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, element.name, extraKeyDiagnosticMessage, keyText));
+                }
+                var value = convertPropertyValueToJson(element.initializer, option);
+                if (typeof keyText !== "undefined") {
+                    if (returnValue) {
+                        result[keyText] = value;
+                    }
+                    // Notify key value set, if user asked for it
+                    if (jsonConversionNotifier &&
+                        // Current callbacks are only on known parent option or if we are setting values in the root
+                        (parentOption || isRootOptionMap(knownOptions))) {
+                        var isValidOptionValue = isCompilerOptionsValue(option, value);
+                        if (parentOption) {
+                            if (isValidOptionValue) {
+                                // Notify option set in the parent if its a valid option value
+                                jsonConversionNotifier.onSetValidOptionKeyValueInParent(parentOption, option, value);
+                            }
+                        }
+                        else if (isRootOptionMap(knownOptions)) {
+                            if (isValidOptionValue) {
+                                // Notify about the valid root key value being set
+                                jsonConversionNotifier.onSetValidOptionKeyValueInRoot(keyText, element.name, value, element.initializer);
+                            }
+                            else if (!option) {
+                                // Notify about the unknown root key value being set
+                                jsonConversionNotifier.onSetUnknownOptionKeyValueInRoot(keyText, element.name, value, element.initializer);
+                            }
+                        }
+                    }
+                }
+            }
+            return result;
+        }
+        function convertArrayLiteralExpressionToJson(elements, elementOption) {
+            return (returnValue ? elements.map : elements.forEach).call(elements, function (element) { return convertPropertyValueToJson(element, elementOption); });
+        }
+        function convertPropertyValueToJson(valueExpression, option) {
+            switch (valueExpression.kind) {
+                case 101 /* TrueKeyword */:
+                    reportInvalidOptionValue(option && option.type !== "boolean");
+                    return true;
+                case 86 /* FalseKeyword */:
+                    reportInvalidOptionValue(option && option.type !== "boolean");
+                    return false;
+                case 95 /* NullKeyword */:
+                    reportInvalidOptionValue(option && option.name === "extends"); // "extends" is the only option we don't allow null/undefined for
+                    return null; // tslint:disable-line:no-null-keyword
+                case 9 /* StringLiteral */:
+                    if (!isDoubleQuotedString(valueExpression)) {
+                        errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, valueExpression, ts.Diagnostics.String_literal_with_double_quotes_expected));
+                    }
+                    reportInvalidOptionValue(option && (ts.isString(option.type) && option.type !== "string"));
+                    var text = valueExpression.text;
+                    if (option && !ts.isString(option.type)) {
+                        var customOption = option;
+                        // Validate custom option type
+                        if (!customOption.type.has(text.toLowerCase())) {
+                            errors.push(createDiagnosticForInvalidCustomType(customOption, function (message, arg0, arg1) { return ts.createDiagnosticForNodeInSourceFile(sourceFile, valueExpression, message, arg0, arg1); }));
+                        }
+                    }
+                    return text;
+                case 8 /* NumericLiteral */:
+                    reportInvalidOptionValue(option && option.type !== "number");
+                    return Number(valueExpression.text);
+                case 198 /* PrefixUnaryExpression */:
+                    if (valueExpression.operator !== 38 /* MinusToken */ || valueExpression.operand.kind !== 8 /* NumericLiteral */) {
+                        break; // not valid JSON syntax
+                    }
+                    reportInvalidOptionValue(option && option.type !== "number");
+                    return -Number(valueExpression.operand.text);
+                case 184 /* ObjectLiteralExpression */:
+                    reportInvalidOptionValue(option && option.type !== "object");
+                    var objectLiteralExpression = valueExpression;
+                    // Currently having element option declaration in the tsconfig with type "object"
+                    // determines if it needs onSetValidOptionKeyValueInParent callback or not
+                    // At moment there are only "compilerOptions", "typeAcquisition" and "typingOptions"
+                    // that satifies it and need it to modify options set in them (for normalizing file paths)
+                    // vs what we set in the json
+                    // If need arises, we can modify this interface and callbacks as needed
+                    if (option) {
+                        var _a = option, elementOptions = _a.elementOptions, extraKeyDiagnosticMessage = _a.extraKeyDiagnosticMessage, optionName = _a.name;
+                        return convertObjectLiteralExpressionToJson(objectLiteralExpression, elementOptions, extraKeyDiagnosticMessage, optionName);
+                    }
+                    else {
+                        return convertObjectLiteralExpressionToJson(objectLiteralExpression, /* knownOptions*/ undefined, 
+                        /*extraKeyDiagnosticMessage */ undefined, /*parentOption*/ undefined);
+                    }
+                case 183 /* ArrayLiteralExpression */:
+                    reportInvalidOptionValue(option && option.type !== "list");
+                    return convertArrayLiteralExpressionToJson(valueExpression.elements, option && option.element);
+            }
+            // Not in expected format
+            if (option) {
+                reportInvalidOptionValue(/*isError*/ true);
+            }
+            else {
+                errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, valueExpression, ts.Diagnostics.Property_value_can_only_be_string_literal_numeric_literal_true_false_null_object_literal_or_array_literal));
+            }
+            return undefined;
+            function reportInvalidOptionValue(isError) {
+                if (isError) {
+                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, valueExpression, ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, option.name, getCompilerOptionValueTypeString(option)));
+                }
+            }
+        }
+        function isDoubleQuotedString(node) {
+            return ts.isStringLiteral(node) && ts.isStringDoubleQuoted(node, sourceFile);
+        }
+    }
+    ts.convertToObjectWorker = convertToObjectWorker;
+    function getCompilerOptionValueTypeString(option) {
+        return option.type === "list" ?
+            "Array" :
+            ts.isString(option.type) ? option.type : "string";
+    }
+    function isCompilerOptionsValue(option, value) {
+        if (option) {
+            if (isNullOrUndefined(value))
+                return true; // All options are undefinable/nullable
+            if (option.type === "list") {
+                return ts.isArray(value);
+            }
+            var expectedType = ts.isString(option.type) ? option.type : "string";
+            return typeof value === expectedType;
+        }
+        return false;
+    }
+    /**
+     * Generate tsconfig configuration when running command line "--init"
+     * @param options commandlineOptions to be generated into tsconfig.json
+     * @param fileNames array of filenames to be generated into tsconfig.json
+     */
+    /* @internal */
+    function generateTSConfig(options, fileNames, newLine) {
+        var compilerOptions = ts.extend(options, ts.defaultInitCompilerOptions);
+        var compilerOptionsMap = serializeCompilerOptions(compilerOptions);
+        return writeConfigurations();
+        function getCustomTypeMapOfCommandLineOption(optionDefinition) {
+            if (optionDefinition.type === "string" || optionDefinition.type === "number" || optionDefinition.type === "boolean") {
+                // this is of a type CommandLineOptionOfPrimitiveType
+                return undefined;
+            }
+            else if (optionDefinition.type === "list") {
+                return getCustomTypeMapOfCommandLineOption(optionDefinition.element);
+            }
+            else {
+                return optionDefinition.type;
+            }
+        }
+        function getNameOfCompilerOptionValue(value, customTypeMap) {
+            // There is a typeMap associated with this command-line option so use it to map value back to its name
+            return ts.forEachEntry(customTypeMap, function (mapValue, key) {
+                if (mapValue === value) {
+                    return key;
+                }
+            });
+        }
+        function serializeCompilerOptions(options) {
+            var result = ts.createMap();
+            var optionsNameMap = getOptionNameMap().optionNameMap;
+            var _loop_3 = function (name) {
+                if (ts.hasProperty(options, name)) {
+                    // tsconfig only options cannot be specified via command line,
+                    // so we can assume that only types that can appear here string | number | boolean
+                    if (optionsNameMap.has(name) && optionsNameMap.get(name).category === ts.Diagnostics.Command_line_Options) {
+                        return "continue";
+                    }
+                    var value = options[name];
+                    var optionDefinition = optionsNameMap.get(name.toLowerCase());
+                    if (optionDefinition) {
+                        var customTypeMap_1 = getCustomTypeMapOfCommandLineOption(optionDefinition);
+                        if (!customTypeMap_1) {
+                            // There is no map associated with this compiler option then use the value as-is
+                            // This is the case if the value is expect to be string, number, boolean or list of string
+                            result.set(name, value);
+                        }
+                        else {
+                            if (optionDefinition.type === "list") {
+                                result.set(name, value.map(function (element) { return getNameOfCompilerOptionValue(element, customTypeMap_1); })); // TODO: GH#18217
+                            }
+                            else {
+                                // There is a typeMap associated with this command-line option so use it to map value back to its name
+                                result.set(name, getNameOfCompilerOptionValue(value, customTypeMap_1));
+                            }
+                        }
+                    }
+                }
+            };
+            for (var name in options) {
+                _loop_3(name);
+            }
+            return result;
+        }
+        function getDefaultValueForOption(option) {
+            switch (option.type) {
+                case "number":
+                    return 1;
+                case "boolean":
+                    return true;
+                case "string":
+                    return option.isFilePath ? "./" : "";
+                case "list":
+                    return [];
+                case "object":
+                    return {};
+                default:
+                    return option.type.keys().next().value;
+            }
+        }
+        function makePadding(paddingLength) {
+            return Array(paddingLength + 1).join(" ");
+        }
+        function isAllowedOption(_a) {
+            var category = _a.category, name = _a.name;
+            // Skip options which do not have a category or have category `Command_line_Options`
+            // Exclude all possible `Advanced_Options` in tsconfig.json which were NOT defined in command line
+            return category !== undefined
+                && category !== ts.Diagnostics.Command_line_Options
+                && (category !== ts.Diagnostics.Advanced_Options || compilerOptionsMap.has(name));
+        }
+        function writeConfigurations() {
+            // Filter applicable options to place in the file
+            var categorizedOptions = ts.createMultiMap();
+            for (var _i = 0, optionDeclarations_1 = ts.optionDeclarations; _i < optionDeclarations_1.length; _i++) {
+                var option = optionDeclarations_1[_i];
+                var category = option.category;
+                if (isAllowedOption(option)) {
+                    categorizedOptions.add(ts.getLocaleSpecificMessage(category), option);
+                }
+            }
+            // Serialize all options and their descriptions
+            var marginLength = 0;
+            var seenKnownKeys = 0;
+            var nameColumn = [];
+            var descriptionColumn = [];
+            categorizedOptions.forEach(function (options, category) {
+                if (nameColumn.length !== 0) {
+                    nameColumn.push("");
+                    descriptionColumn.push("");
+                }
+                nameColumn.push("/* " + category + " */");
+                descriptionColumn.push("");
+                for (var _i = 0, options_1 = options; _i < options_1.length; _i++) {
+                    var option = options_1[_i];
+                    var optionName = void 0;
+                    if (compilerOptionsMap.has(option.name)) {
+                        optionName = "\"" + option.name + "\": " + JSON.stringify(compilerOptionsMap.get(option.name)) + ((seenKnownKeys += 1) === compilerOptionsMap.size ? "" : ",");
+                    }
+                    else {
+                        optionName = "// \"" + option.name + "\": " + JSON.stringify(getDefaultValueForOption(option)) + ",";
+                    }
+                    nameColumn.push(optionName);
+                    descriptionColumn.push("/* " + (option.description && ts.getLocaleSpecificMessage(option.description) || option.name) + " */");
+                    marginLength = Math.max(optionName.length, marginLength);
+                }
+            });
+            // Write the output
+            var tab = makePadding(2);
+            var result = [];
+            result.push("{");
+            result.push(tab + "\"compilerOptions\": {");
+            // Print out each row, aligning all the descriptions on the same column.
+            for (var i = 0; i < nameColumn.length; i++) {
+                var optionName = nameColumn[i];
+                var description = descriptionColumn[i];
+                result.push(optionName && "" + tab + tab + optionName + (description && (makePadding(marginLength - optionName.length + 2) + description)));
+            }
+            if (fileNames.length) {
+                result.push(tab + "},");
+                result.push(tab + "\"files\": [");
+                for (var i = 0; i < fileNames.length; i++) {
+                    result.push("" + tab + tab + JSON.stringify(fileNames[i]) + (i === fileNames.length - 1 ? "" : ","));
+                }
+                result.push(tab + "]");
+            }
+            else {
+                result.push(tab + "}");
+            }
+            result.push("}");
+            return result.join(newLine);
+        }
+    }
+    ts.generateTSConfig = generateTSConfig;
+    /**
+     * Parse the contents of a config file (tsconfig.json).
+     * @param json The contents of the config file to parse
+     * @param host Instance of ParseConfigHost used to enumerate files in folder.
+     * @param basePath A root directory to resolve relative path entries in the config
+     *    file to. e.g. outDir
+     */
+    function parseJsonConfigFileContent(json, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions) {
+        return parseJsonConfigFileContentWorker(json, /*sourceFile*/ undefined, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions);
+    }
+    ts.parseJsonConfigFileContent = parseJsonConfigFileContent;
+    /**
+     * Parse the contents of a config file (tsconfig.json).
+     * @param jsonNode The contents of the config file to parse
+     * @param host Instance of ParseConfigHost used to enumerate files in folder.
+     * @param basePath A root directory to resolve relative path entries in the config
+     *    file to. e.g. outDir
+     */
+    function parseJsonSourceFileConfigFileContent(sourceFile, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions) {
+        return parseJsonConfigFileContentWorker(/*json*/ undefined, sourceFile, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions);
+    }
+    ts.parseJsonSourceFileConfigFileContent = parseJsonSourceFileConfigFileContent;
+    /*@internal*/
+    function setConfigFileInOptions(options, configFile) {
+        if (configFile) {
+            Object.defineProperty(options, "configFile", { enumerable: false, writable: false, value: configFile });
+        }
+    }
+    ts.setConfigFileInOptions = setConfigFileInOptions;
+    function isNullOrUndefined(x) {
+        // tslint:disable-next-line:no-null-keyword
+        return x === undefined || x === null;
+    }
+    function directoryOfCombinedPath(fileName, basePath) {
+        // Use the `getNormalizedAbsolutePath` function to avoid canonicalizing the path, as it must remain noncanonical
+        // until consistient casing errors are reported
+        return ts.getDirectoryPath(ts.getNormalizedAbsolutePath(fileName, basePath));
+    }
+    /**
+     * Parse the contents of a config file from json or json source file (tsconfig.json).
+     * @param json The contents of the config file to parse
+     * @param sourceFile sourceFile corresponding to the Json
+     * @param host Instance of ParseConfigHost used to enumerate files in folder.
+     * @param basePath A root directory to resolve relative path entries in the config
+     *    file to. e.g. outDir
+     * @param resolutionStack Only present for backwards-compatibility. Should be empty.
+     */
+    function parseJsonConfigFileContentWorker(json, sourceFile, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions) {
+        if (existingOptions === void 0) { existingOptions = {}; }
+        if (resolutionStack === void 0) { resolutionStack = []; }
+        if (extraFileExtensions === void 0) { extraFileExtensions = []; }
+        ts.Debug.assert((json === undefined && sourceFile !== undefined) || (json !== undefined && sourceFile === undefined));
+        var errors = [];
+        var parsedConfig = parseConfig(json, sourceFile, host, basePath, configFileName, resolutionStack, errors);
+        var raw = parsedConfig.raw;
+        var options = ts.extend(existingOptions, parsedConfig.options || {});
+        options.configFilePath = configFileName && ts.normalizeSlashes(configFileName);
+        setConfigFileInOptions(options, sourceFile);
+        var _a = getFileNames(), fileNames = _a.fileNames, wildcardDirectories = _a.wildcardDirectories, spec = _a.spec, projectReferences = _a.projectReferences;
+        return {
+            options: options,
+            fileNames: fileNames,
+            projectReferences: projectReferences,
+            typeAcquisition: parsedConfig.typeAcquisition || getDefaultTypeAcquisition(),
+            raw: raw,
+            errors: errors,
+            wildcardDirectories: wildcardDirectories,
+            compileOnSave: !!raw.compileOnSave,
+            configFileSpecs: spec
+        };
+        function getFileNames() {
+            var filesSpecs;
+            if (ts.hasProperty(raw, "files") && !isNullOrUndefined(raw.files)) {
+                if (ts.isArray(raw.files)) {
+                    filesSpecs = raw.files;
+                    if (filesSpecs.length === 0) {
+                        createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.The_files_list_in_config_file_0_is_empty, configFileName || "tsconfig.json");
+                    }
+                }
+                else {
+                    createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "files", "Array");
+                }
+            }
+            var includeSpecs;
+            if (ts.hasProperty(raw, "include") && !isNullOrUndefined(raw.include)) {
+                if (ts.isArray(raw.include)) {
+                    includeSpecs = raw.include;
+                }
+                else {
+                    createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "include", "Array");
+                }
+            }
+            var excludeSpecs;
+            if (ts.hasProperty(raw, "exclude") && !isNullOrUndefined(raw.exclude)) {
+                if (ts.isArray(raw.exclude)) {
+                    excludeSpecs = raw.exclude;
+                }
+                else {
+                    createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "exclude", "Array");
+                }
+            }
+            else if (raw.compilerOptions) {
+                var outDir = raw.compilerOptions.outDir;
+                var declarationDir = raw.compilerOptions.declarationDir;
+                if (outDir || declarationDir) {
+                    excludeSpecs = [outDir, declarationDir].filter(function (d) { return !!d; });
+                }
+            }
+            if (filesSpecs === undefined && includeSpecs === undefined) {
+                includeSpecs = ["**/*"];
+            }
+            var result = matchFileNames(filesSpecs, includeSpecs, excludeSpecs, configFileName ? directoryOfCombinedPath(configFileName, basePath) : basePath, options, host, errors, extraFileExtensions, sourceFile);
+            if (result.fileNames.length === 0 && !ts.hasProperty(raw, "files") && resolutionStack.length === 0 && !ts.hasProperty(raw, "references")) {
+                errors.push(getErrorForNoInputFiles(result.spec, configFileName));
+            }
+            if (ts.hasProperty(raw, "references") && !isNullOrUndefined(raw.references)) {
+                if (ts.isArray(raw.references)) {
+                    var references = [];
+                    for (var _i = 0, _a = raw.references; _i < _a.length; _i++) {
+                        var ref = _a[_i];
+                        if (typeof ref.path !== "string") {
+                            createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "reference.path", "string");
+                        }
+                        else {
+                            references.push({
+                                path: ts.getNormalizedAbsolutePath(ref.path, basePath),
+                                originalPath: ref.path,
+                                prepend: ref.prepend,
+                                circular: ref.circular
+                            });
+                        }
+                    }
+                    result.projectReferences = references;
+                }
+                else {
+                    createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "references", "Array");
+                }
+            }
+            return result;
+        }
+        function createCompilerDiagnosticOnlyIfJson(message, arg0, arg1) {
+            if (!sourceFile) {
+                errors.push(ts.createCompilerDiagnostic(message, arg0, arg1));
+            }
+        }
+    }
+    /*@internal*/
+    function isErrorNoInputFiles(error) {
+        return error.code === ts.Diagnostics.No_inputs_were_found_in_config_file_0_Specified_include_paths_were_1_and_exclude_paths_were_2.code;
+    }
+    ts.isErrorNoInputFiles = isErrorNoInputFiles;
+    /*@internal*/
+    function getErrorForNoInputFiles(_a, configFileName) {
+        var includeSpecs = _a.includeSpecs, excludeSpecs = _a.excludeSpecs;
+        return ts.createCompilerDiagnostic(ts.Diagnostics.No_inputs_were_found_in_config_file_0_Specified_include_paths_were_1_and_exclude_paths_were_2, configFileName || "tsconfig.json", JSON.stringify(includeSpecs || []), JSON.stringify(excludeSpecs || []));
+    }
+    ts.getErrorForNoInputFiles = getErrorForNoInputFiles;
+    function isSuccessfulParsedTsconfig(value) {
+        return !!value.options;
+    }
+    /**
+     * This *just* extracts options/include/exclude/files out of a config file.
+     * It does *not* resolve the included files.
+     */
+    function parseConfig(json, sourceFile, host, basePath, configFileName, resolutionStack, errors) {
+        basePath = ts.normalizeSlashes(basePath);
+        var resolvedPath = ts.getNormalizedAbsolutePath(configFileName || "", basePath);
+        if (resolutionStack.indexOf(resolvedPath) >= 0) {
+            errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Circularity_detected_while_resolving_configuration_Colon_0, resolutionStack.concat([resolvedPath]).join(" -> ")));
+            return { raw: json || convertToObject(sourceFile, errors) };
+        }
+        var ownConfig = json ?
+            parseOwnConfigOfJson(json, host, basePath, configFileName, errors) :
+            parseOwnConfigOfJsonSourceFile(sourceFile, host, basePath, configFileName, errors);
+        if (ownConfig.extendedConfigPath) {
+            // copy the resolution stack so it is never reused between branches in potential diamond-problem scenarios.
+            resolutionStack = resolutionStack.concat([resolvedPath]);
+            var extendedConfig = getExtendedConfig(sourceFile, ownConfig.extendedConfigPath, host, basePath, resolutionStack, errors);
+            if (extendedConfig && isSuccessfulParsedTsconfig(extendedConfig)) {
+                var baseRaw_1 = extendedConfig.raw;
+                var raw_1 = ownConfig.raw;
+                var setPropertyInRawIfNotUndefined = function (propertyName) {
+                    var value = raw_1[propertyName] || baseRaw_1[propertyName];
+                    if (value) {
+                        raw_1[propertyName] = value;
+                    }
+                };
+                setPropertyInRawIfNotUndefined("include");
+                setPropertyInRawIfNotUndefined("exclude");
+                setPropertyInRawIfNotUndefined("files");
+                if (raw_1.compileOnSave === undefined) {
+                    raw_1.compileOnSave = baseRaw_1.compileOnSave;
+                }
+                ownConfig.options = ts.assign({}, extendedConfig.options, ownConfig.options);
+                // TODO extend type typeAcquisition
+            }
+        }
+        return ownConfig;
+    }
+    function parseOwnConfigOfJson(json, host, basePath, configFileName, errors) {
+        if (ts.hasProperty(json, "excludes")) {
+            errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Unknown_option_excludes_Did_you_mean_exclude));
+        }
+        var options = convertCompilerOptionsFromJsonWorker(json.compilerOptions, basePath, errors, configFileName);
+        // typingOptions has been deprecated and is only supported for backward compatibility purposes.
+        // It should be removed in future releases - use typeAcquisition instead.
+        var typeAcquisition = convertTypeAcquisitionFromJsonWorker(json.typeAcquisition || json.typingOptions, basePath, errors, configFileName);
+        json.compileOnSave = convertCompileOnSaveOptionFromJson(json, basePath, errors);
+        var extendedConfigPath;
+        if (json.extends) {
+            if (!ts.isString(json.extends)) {
+                errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "extends", "string"));
+            }
+            else {
+                var newBase = configFileName ? directoryOfCombinedPath(configFileName, basePath) : basePath;
+                extendedConfigPath = getExtendsConfigPath(json.extends, host, newBase, errors, ts.createCompilerDiagnostic);
+            }
+        }
+        return { raw: json, options: options, typeAcquisition: typeAcquisition, extendedConfigPath: extendedConfigPath };
+    }
+    function parseOwnConfigOfJsonSourceFile(sourceFile, host, basePath, configFileName, errors) {
+        var options = getDefaultCompilerOptions(configFileName);
+        var typeAcquisition, typingOptionstypeAcquisition;
+        var extendedConfigPath;
+        var optionsIterator = {
+            onSetValidOptionKeyValueInParent: function (parentOption, option, value) {
+                ts.Debug.assert(parentOption === "compilerOptions" || parentOption === "typeAcquisition" || parentOption === "typingOptions");
+                var currentOption = parentOption === "compilerOptions" ?
+                    options :
+                    parentOption === "typeAcquisition" ?
+                        (typeAcquisition || (typeAcquisition = getDefaultTypeAcquisition(configFileName))) :
+                        (typingOptionstypeAcquisition || (typingOptionstypeAcquisition = getDefaultTypeAcquisition(configFileName)));
+                currentOption[option.name] = normalizeOptionValue(option, basePath, value);
+            },
+            onSetValidOptionKeyValueInRoot: function (key, _keyNode, value, valueNode) {
+                switch (key) {
+                    case "extends":
+                        var newBase = configFileName ? directoryOfCombinedPath(configFileName, basePath) : basePath;
+                        extendedConfigPath = getExtendsConfigPath(value, host, newBase, errors, function (message, arg0) {
+                            return ts.createDiagnosticForNodeInSourceFile(sourceFile, valueNode, message, arg0);
+                        });
+                        return;
+                    case "files":
+                        if (value.length === 0) {
+                            errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, valueNode, ts.Diagnostics.The_files_list_in_config_file_0_is_empty, configFileName || "tsconfig.json"));
+                        }
+                        return;
+                }
+            },
+            onSetUnknownOptionKeyValueInRoot: function (key, keyNode, _value, _valueNode) {
+                if (key === "excludes") {
+                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, keyNode, ts.Diagnostics.Unknown_option_excludes_Did_you_mean_exclude));
+                }
+            }
+        };
+        var json = convertToObjectWorker(sourceFile, errors, /*returnValue*/ true, getTsconfigRootOptionsMap(), optionsIterator);
+        if (!typeAcquisition) {
+            if (typingOptionstypeAcquisition) {
+                typeAcquisition = (typingOptionstypeAcquisition.enableAutoDiscovery !== undefined) ?
+                    {
+                        enable: typingOptionstypeAcquisition.enableAutoDiscovery,
+                        include: typingOptionstypeAcquisition.include,
+                        exclude: typingOptionstypeAcquisition.exclude
+                    } :
+                    typingOptionstypeAcquisition;
+            }
+            else {
+                typeAcquisition = getDefaultTypeAcquisition(configFileName);
+            }
+        }
+        return { raw: json, options: options, typeAcquisition: typeAcquisition, extendedConfigPath: extendedConfigPath };
+    }
+    function getExtendsConfigPath(extendedConfig, host, basePath, errors, createDiagnostic) {
+        extendedConfig = ts.normalizeSlashes(extendedConfig);
+        // If the path isn't a rooted or relative path, don't try to resolve it (we reserve the right to special case module-id like paths in the future)
+        if (!(ts.isRootedDiskPath(extendedConfig) || ts.startsWith(extendedConfig, "./") || ts.startsWith(extendedConfig, "../"))) {
+            errors.push(createDiagnostic(ts.Diagnostics.A_path_in_an_extends_option_must_be_relative_or_rooted_but_0_is_not, extendedConfig));
+            return undefined;
+        }
+        var extendedConfigPath = ts.getNormalizedAbsolutePath(extendedConfig, basePath);
+        if (!host.fileExists(extendedConfigPath) && !ts.endsWith(extendedConfigPath, ".json" /* Json */)) {
+            extendedConfigPath = extendedConfigPath + ".json";
+            if (!host.fileExists(extendedConfigPath)) {
+                errors.push(createDiagnostic(ts.Diagnostics.File_0_does_not_exist, extendedConfig));
+                return undefined;
+            }
+        }
+        return extendedConfigPath;
+    }
+    function getExtendedConfig(sourceFile, extendedConfigPath, host, basePath, resolutionStack, errors) {
+        var _a;
+        var extendedResult = readJsonConfigFile(extendedConfigPath, function (path) { return host.readFile(path); });
+        if (sourceFile) {
+            (sourceFile.extendedSourceFiles || (sourceFile.extendedSourceFiles = [])).push(extendedResult.fileName);
+        }
+        if (extendedResult.parseDiagnostics.length) {
+            errors.push.apply(errors, extendedResult.parseDiagnostics);
+            return undefined;
+        }
+        var extendedDirname = ts.getDirectoryPath(extendedConfigPath);
+        var extendedConfig = parseConfig(/*json*/ undefined, extendedResult, host, extendedDirname, ts.getBaseFileName(extendedConfigPath), resolutionStack, errors);
+        if (sourceFile) {
+            (_a = sourceFile.extendedSourceFiles).push.apply(_a, extendedResult.extendedSourceFiles);
+        }
+        if (isSuccessfulParsedTsconfig(extendedConfig)) {
+            // Update the paths to reflect base path
+            var relativeDifference_1 = ts.convertToRelativePath(extendedDirname, basePath, ts.identity);
+            var updatePath_1 = function (path) { return ts.isRootedDiskPath(path) ? path : ts.combinePaths(relativeDifference_1, path); };
+            var mapPropertiesInRawIfNotUndefined = function (propertyName) {
+                if (raw_2[propertyName]) {
+                    raw_2[propertyName] = ts.map(raw_2[propertyName], updatePath_1);
+                }
+            };
+            var raw_2 = extendedConfig.raw;
+            mapPropertiesInRawIfNotUndefined("include");
+            mapPropertiesInRawIfNotUndefined("exclude");
+            mapPropertiesInRawIfNotUndefined("files");
+        }
+        return extendedConfig;
+    }
+    function convertCompileOnSaveOptionFromJson(jsonOption, basePath, errors) {
+        if (!ts.hasProperty(jsonOption, ts.compileOnSaveCommandLineOption.name)) {
             return false;
         }
-        function getParentOfBinaryExpression(expr) {
-            while (ts.isBinaryExpression(expr.parent)) {
-                expr = expr.parent;
-            }
-            return expr.parent;
+        var result = convertJsonOption(ts.compileOnSaveCommandLineOption, jsonOption.compileOnSave, basePath, errors);
+        return typeof result === "boolean" && result;
+    }
+    function convertCompilerOptionsFromJson(jsonOptions, basePath, configFileName) {
+        var errors = [];
+        var options = convertCompilerOptionsFromJsonWorker(jsonOptions, basePath, errors, configFileName);
+        return { options: options, errors: errors };
+    }
+    ts.convertCompilerOptionsFromJson = convertCompilerOptionsFromJson;
+    function convertTypeAcquisitionFromJson(jsonOptions, basePath, configFileName) {
+        var errors = [];
+        var options = convertTypeAcquisitionFromJsonWorker(jsonOptions, basePath, errors, configFileName);
+        return { options: options, errors: errors };
+    }
+    ts.convertTypeAcquisitionFromJson = convertTypeAcquisitionFromJson;
+    function getDefaultCompilerOptions(configFileName) {
+        var options = configFileName && ts.getBaseFileName(configFileName) === "jsconfig.json"
+            ? { allowJs: true, maxNodeModuleJsDepth: 2, allowSyntheticDefaultImports: true, skipLibCheck: true, noEmit: true }
+            : {};
+        return options;
+    }
+    function convertCompilerOptionsFromJsonWorker(jsonOptions, basePath, errors, configFileName) {
+        var options = getDefaultCompilerOptions(configFileName);
+        convertOptionsFromJson(ts.optionDeclarations, jsonOptions, basePath, options, ts.Diagnostics.Unknown_compiler_option_0, errors);
+        if (configFileName) {
+            options.configFilePath = ts.normalizeSlashes(configFileName);
         }
-        function lookupSymbolForPropertyAccess(node, lookupContainer) {
-            if (lookupContainer === void 0) { lookupContainer = container; }
-            if (ts.isIdentifier(node)) {
-                return lookupSymbolForNameWorker(lookupContainer, node.escapedText);
+        return options;
+    }
+    function getDefaultTypeAcquisition(configFileName) {
+        return { enable: !!configFileName && ts.getBaseFileName(configFileName) === "jsconfig.json", include: [], exclude: [] };
+    }
+    function convertTypeAcquisitionFromJsonWorker(jsonOptions, basePath, errors, configFileName) {
+        var options = getDefaultTypeAcquisition(configFileName);
+        var typeAcquisition = convertEnableAutoDiscoveryToEnable(jsonOptions);
+        convertOptionsFromJson(ts.typeAcquisitionDeclarations, typeAcquisition, basePath, options, ts.Diagnostics.Unknown_type_acquisition_option_0, errors);
+        return options;
+    }
+    function convertOptionsFromJson(optionDeclarations, jsonOptions, basePath, defaultOptions, diagnosticMessage, errors) {
+        if (!jsonOptions) {
+            return;
+        }
+        var optionNameMap = commandLineOptionsToMap(optionDeclarations);
+        for (var id in jsonOptions) {
+            var opt = optionNameMap.get(id);
+            if (opt) {
+                defaultOptions[opt.name] = convertJsonOption(opt, jsonOptions[id], basePath, errors);
             }
             else {
-                var symbol = lookupSymbolForPropertyAccess(node.expression);
-                return symbol && symbol.exports && symbol.exports.get(node.name.escapedText);
+                errors.push(ts.createCompilerDiagnostic(diagnosticMessage, id));
             }
         }
-        function forEachIdentifierInEntityName(e, parent, action) {
-            if (isExportsOrModuleExportsOrAlias(file, e)) {
-                return file.symbol;
+    }
+    function convertJsonOption(opt, value, basePath, errors) {
+        if (isCompilerOptionsValue(opt, value)) {
+            var optType = opt.type;
+            if (optType === "list" && ts.isArray(value)) {
+                return convertJsonOptionOfListType(opt, value, basePath, errors);
             }
-            else if (ts.isIdentifier(e)) {
-                return action(e, lookupSymbolForPropertyAccess(e), parent);
+            else if (!ts.isString(optType)) {
+                return convertJsonOptionOfCustomType(opt, value, errors);
             }
-            else {
-                var s = forEachIdentifierInEntityName(e.expression, parent, action);
-                if (!s || !s.exports)
-                    return ts.Debug.fail();
-                return action(e.name, s.exports.get(e.name.escapedText), s);
+            return normalizeNonListOptionValue(opt, basePath, value);
+        }
+        else {
+            errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, opt.name, getCompilerOptionValueTypeString(opt)));
+        }
+    }
+    function normalizeOptionValue(option, basePath, value) {
+        if (isNullOrUndefined(value))
+            return undefined;
+        if (option.type === "list") {
+            var listOption_1 = option;
+            if (listOption_1.element.isFilePath || !ts.isString(listOption_1.element.type)) {
+                return ts.filter(ts.map(value, function (v) { return normalizeOptionValue(listOption_1.element, basePath, v); }), function (v) { return !!v; });
+            }
+            return value;
+        }
+        else if (!ts.isString(option.type)) {
+            return option.type.get(ts.isString(value) ? value.toLowerCase() : value);
+        }
+        return normalizeNonListOptionValue(option, basePath, value);
+    }
+    function normalizeNonListOptionValue(option, basePath, value) {
+        if (option.isFilePath) {
+            value = ts.normalizePath(ts.combinePaths(basePath, value));
+            if (value === "") {
+                value = ".";
             }
         }
-        function bindCallExpression(node) {
-            if (!file.commonJsModuleIndicator && ts.isRequireCall(node, false)) {
-                setCommonJsModuleIndicator(node);
+        return value;
+    }
+    function convertJsonOptionOfCustomType(opt, value, errors) {
+        if (isNullOrUndefined(value))
+            return undefined;
+        var key = value.toLowerCase();
+        var val = opt.type.get(key);
+        if (val !== undefined) {
+            return val;
+        }
+        else {
+            errors.push(createCompilerDiagnosticForInvalidCustomType(opt));
+        }
+    }
+    function convertJsonOptionOfListType(option, values, basePath, errors) {
+        return ts.filter(ts.map(values, function (v) { return convertJsonOption(option.element, v, basePath, errors); }), function (v) { return !!v; });
+    }
+    function trimString(s) {
+        return typeof s.trim === "function" ? s.trim() : s.replace(/^[\s]+|[\s]+$/g, "");
+    }
+    /**
+     * Tests for a path that ends in a recursive directory wildcard.
+     * Matches **, \**, **\, and \**\, but not a**b.
+     *
+     * NOTE: used \ in place of / above to avoid issues with multiline comments.
+     *
+     * Breakdown:
+     *  (^|\/)      # matches either the beginning of the string or a directory separator.
+     *  \*\*        # matches the recursive directory wildcard "**".
+     *  \/?$        # matches an optional trailing directory separator at the end of the string.
+     */
+    var invalidTrailingRecursionPattern = /(^|\/)\*\*\/?$/;
+    /**
+     * Tests for a path where .. appears after a recursive directory wildcard.
+     * Matches **\..\*, **\a\..\*, and **\.., but not ..\**\*
+     *
+     * NOTE: used \ in place of / above to avoid issues with multiline comments.
+     *
+     * Breakdown:
+     *  (^|\/)      # matches either the beginning of the string or a directory separator.
+     *  \*\*\/      # matches a recursive directory wildcard "**" followed by a directory separator.
+     *  (.*\/)?     # optionally matches any number of characters followed by a directory separator.
+     *  \.\.        # matches a parent directory path component ".."
+     *  ($|\/)      # matches either the end of the string or a directory separator.
+     */
+    var invalidDotDotAfterRecursiveWildcardPattern = /(^|\/)\*\*\/(.*\/)?\.\.($|\/)/;
+    /**
+     * Tests for a path containing a wildcard character in a directory component of the path.
+     * Matches \*\, \?\, and \a*b\, but not \a\ or \a\*.
+     *
+     * NOTE: used \ in place of / above to avoid issues with multiline comments.
+     *
+     * Breakdown:
+     *  \/          # matches a directory separator.
+     *  [^/]*?      # matches any number of characters excluding directory separators (non-greedy).
+     *  [*?]        # matches either a wildcard character (* or ?)
+     *  [^/]*       # matches any number of characters excluding directory separators (greedy).
+     *  \/          # matches a directory separator.
+     */
+    var watchRecursivePattern = /\/[^/]*?[*?][^/]*\//;
+    /**
+     * Matches the portion of a wildcard path that does not contain wildcards.
+     * Matches \a of \a\*, or \a\b\c of \a\b\c\?\d.
+     *
+     * NOTE: used \ in place of / above to avoid issues with multiline comments.
+     *
+     * Breakdown:
+     *  ^                   # matches the beginning of the string
+     *  [^*?]*              # matches any number of non-wildcard characters
+     *  (?=\/[^/]*[*?])     # lookahead that matches a directory separator followed by
+     *                      # a path component that contains at least one wildcard character (* or ?).
+     */
+    var wildcardDirectoryPattern = /^[^*?]*(?=\/[^/]*[*?])/;
+    /**
+     * Expands an array of file specifications.
+     *
+     * @param filesSpecs The literal file names to include.
+     * @param includeSpecs The wildcard file specifications to include.
+     * @param excludeSpecs The wildcard file specifications to exclude.
+     * @param basePath The base path for any relative file specifications.
+     * @param options Compiler options.
+     * @param host The host used to resolve files and directories.
+     * @param errors An array for diagnostic reporting.
+     */
+    function matchFileNames(filesSpecs, includeSpecs, excludeSpecs, basePath, options, host, errors, extraFileExtensions, jsonSourceFile) {
+        basePath = ts.normalizePath(basePath);
+        var validatedIncludeSpecs, validatedExcludeSpecs;
+        // The exclude spec list is converted into a regular expression, which allows us to quickly
+        // test whether a file or directory should be excluded before recursively traversing the
+        // file system.
+        if (includeSpecs) {
+            validatedIncludeSpecs = validateSpecs(includeSpecs, errors, /*allowTrailingRecursion*/ false, jsonSourceFile, "include");
+        }
+        if (excludeSpecs) {
+            validatedExcludeSpecs = validateSpecs(excludeSpecs, errors, /*allowTrailingRecursion*/ true, jsonSourceFile, "exclude");
+        }
+        // Wildcard directories (provided as part of a wildcard path) are stored in a
+        // file map that marks whether it was a regular wildcard match (with a `*` or `?` token),
+        // or a recursive directory. This information is used by filesystem watchers to monitor for
+        // new entries in these paths.
+        var wildcardDirectories = getWildcardDirectories(validatedIncludeSpecs, validatedExcludeSpecs, basePath, host.useCaseSensitiveFileNames);
+        var spec = { filesSpecs: filesSpecs, referencesSpecs: undefined, includeSpecs: includeSpecs, excludeSpecs: excludeSpecs, validatedIncludeSpecs: validatedIncludeSpecs, validatedExcludeSpecs: validatedExcludeSpecs, wildcardDirectories: wildcardDirectories };
+        return getFileNamesFromConfigSpecs(spec, basePath, options, host, extraFileExtensions);
+    }
+    /**
+     * Gets the file names from the provided config file specs that contain, files, include, exclude and
+     * other properties needed to resolve the file names
+     * @param spec The config file specs extracted with file names to include, wildcards to include/exclude and other details
+     * @param basePath The base path for any relative file specifications.
+     * @param options Compiler options.
+     * @param host The host used to resolve files and directories.
+     * @param extraFileExtensions optionaly file extra file extension information from host
+     */
+    /* @internal */
+    function getFileNamesFromConfigSpecs(spec, basePath, options, host, extraFileExtensions) {
+        if (extraFileExtensions === void 0) { extraFileExtensions = []; }
+        basePath = ts.normalizePath(basePath);
+        var keyMapper = host.useCaseSensitiveFileNames ? ts.identity : ts.toLowerCase;
+        // Literal file names (provided via the "files" array in tsconfig.json) are stored in a
+        // file map with a possibly case insensitive key. We use this map later when when including
+        // wildcard paths.
+        var literalFileMap = ts.createMap();
+        // Wildcard paths (provided via the "includes" array in tsconfig.json) are stored in a
+        // file map with a possibly case insensitive key. We use this map to store paths matched
+        // via wildcard, and to handle extension priority.
+        var wildcardFileMap = ts.createMap();
+        var filesSpecs = spec.filesSpecs, validatedIncludeSpecs = spec.validatedIncludeSpecs, validatedExcludeSpecs = spec.validatedExcludeSpecs, wildcardDirectories = spec.wildcardDirectories;
+        // Rather than requery this for each file and filespec, we query the supported extensions
+        // once and store it on the expansion context.
+        var supportedExtensions = ts.getSupportedExtensions(options, extraFileExtensions);
+        // Literal files are always included verbatim. An "include" or "exclude" specification cannot
+        // remove a literal file.
+        if (filesSpecs) {
+            for (var _i = 0, filesSpecs_1 = filesSpecs; _i < filesSpecs_1.length; _i++) {
+                var fileName = filesSpecs_1[_i];
+                var file = ts.getNormalizedAbsolutePath(fileName, basePath);
+                literalFileMap.set(keyMapper(file), file);
             }
         }
-        function bindClassLikeDeclaration(node) {
-            if (node.kind === 235) {
-                bindBlockScopedDeclaration(node, 32, 68008383);
-            }
-            else {
-                var bindingName = node.name ? node.name.escapedText : "__class";
-                bindAnonymousDeclaration(node, 32, bindingName);
-                if (node.name) {
-                    classifiableNames.set(node.name.escapedText, true);
+        if (validatedIncludeSpecs && validatedIncludeSpecs.length > 0) {
+            for (var _a = 0, _b = host.readDirectory(basePath, supportedExtensions, validatedExcludeSpecs, validatedIncludeSpecs, /*depth*/ undefined); _a < _b.length; _a++) {
+                var file = _b[_a];
+                // If we have already included a literal or wildcard path with a
+                // higher priority extension, we should skip this file.
+                //
+                // This handles cases where we may encounter both <file>.ts and
+                // <file>.d.ts (or <file>.js if "allowJs" is enabled) in the same
+                // directory when they are compilation outputs.
+                if (hasFileWithHigherPriorityExtension(file, literalFileMap, wildcardFileMap, supportedExtensions, keyMapper)) {
+                    continue;
                 }
-            }
-            var symbol = node.symbol;
-            var prototypeSymbol = createSymbol(4 | 4194304, "prototype");
-            var symbolExport = symbol.exports.get(prototypeSymbol.escapedName);
-            if (symbolExport) {
-                if (node.name) {
-                    node.name.parent = node;
-                }
-                file.bindDiagnostics.push(createDiagnosticForNode(symbolExport.declarations[0], ts.Diagnostics.Duplicate_identifier_0, ts.symbolName(prototypeSymbol)));
-            }
-            symbol.exports.set(prototypeSymbol.escapedName, prototypeSymbol);
-            prototypeSymbol.parent = symbol;
-        }
-        function bindEnumDeclaration(node) {
-            return ts.isConst(node)
-                ? bindBlockScopedDeclaration(node, 128, 68008831)
-                : bindBlockScopedDeclaration(node, 256, 68008191);
-        }
-        function bindVariableDeclarationOrBindingElement(node) {
-            if (inStrictMode) {
-                checkStrictModeEvalOrArguments(node, node.name);
-            }
-            if (!ts.isBindingPattern(node.name)) {
-                if (ts.isBlockOrCatchScoped(node)) {
-                    bindBlockScopedVariableDeclaration(node);
-                }
-                else if (ts.isParameterDeclaration(node)) {
-                    declareSymbolAndAddToSymbolTable(node, 1, 67216319);
-                }
-                else {
-                    declareSymbolAndAddToSymbolTable(node, 1, 67216318);
+                // We may have included a wildcard path with a lower priority
+                // extension due to the user-defined order of entries in the
+                // "include" array. If there is a lower priority extension in the
+                // same directory, we should remove it.
+                removeWildcardFilesWithLowerPriorityExtension(file, wildcardFileMap, supportedExtensions, keyMapper);
+                var key = keyMapper(file);
+                if (!literalFileMap.has(key) && !wildcardFileMap.has(key)) {
+                    wildcardFileMap.set(key, file);
                 }
             }
         }
-        function bindParameter(node) {
-            if (node.kind === 293 && container.kind !== 288) {
-                return;
-            }
-            if (inStrictMode && !(node.flags & 4194304)) {
-                checkStrictModeEvalOrArguments(node, node.name);
-            }
-            if (ts.isBindingPattern(node.name)) {
-                bindAnonymousDeclaration(node, 1, "__" + node.parent.parameters.indexOf(node));
-            }
-            else {
-                declareSymbolAndAddToSymbolTable(node, 1, 67216319);
-            }
-            if (ts.isParameterPropertyDeclaration(node)) {
-                var classDeclaration = node.parent.parent;
-                declareSymbol(classDeclaration.symbol.members, classDeclaration.symbol, node, 4 | (node.questionToken ? 16777216 : 0), 0);
+        var literalFiles = ts.arrayFrom(literalFileMap.values());
+        var wildcardFiles = ts.arrayFrom(wildcardFileMap.values());
+        var projectReferences = spec.referencesSpecs && spec.referencesSpecs.map(function (r) {
+            return __assign({}, r, { path: ts.getNormalizedAbsolutePath(r.path, basePath) });
+        });
+        return {
+            fileNames: literalFiles.concat(wildcardFiles),
+            projectReferences: projectReferences,
+            wildcardDirectories: wildcardDirectories,
+            spec: spec
+        };
+    }
+    ts.getFileNamesFromConfigSpecs = getFileNamesFromConfigSpecs;
+    function validateSpecs(specs, errors, allowTrailingRecursion, jsonSourceFile, specKey) {
+        return specs.filter(function (spec) {
+            var diag = specToDiagnostic(spec, allowTrailingRecursion);
+            if (diag !== undefined) {
+                errors.push(createDiagnostic(diag, spec));
             }
+            return diag === undefined;
+        });
+        function createDiagnostic(message, spec) {
+            var element = ts.getTsConfigPropArrayElementValue(jsonSourceFile, specKey, spec);
+            return element ?
+                ts.createDiagnosticForNodeInSourceFile(jsonSourceFile, element, message, spec) :
+                ts.createCompilerDiagnostic(message, spec);
         }
-        function bindFunctionDeclaration(node) {
-            if (!file.isDeclarationFile && !(node.flags & 4194304)) {
-                if (ts.isAsyncFunction(node)) {
-                    emitFlags |= 1024;
+    }
+    function specToDiagnostic(spec, allowTrailingRecursion) {
+        if (!allowTrailingRecursion && invalidTrailingRecursionPattern.test(spec)) {
+            return ts.Diagnostics.File_specification_cannot_end_in_a_recursive_directory_wildcard_Asterisk_Asterisk_Colon_0;
+        }
+        else if (invalidDotDotAfterRecursiveWildcardPattern.test(spec)) {
+            return ts.Diagnostics.File_specification_cannot_contain_a_parent_directory_that_appears_after_a_recursive_directory_wildcard_Asterisk_Asterisk_Colon_0;
+        }
+    }
+    /**
+     * Gets directories in a set of include patterns that should be watched for changes.
+     */
+    function getWildcardDirectories(include, exclude, path, useCaseSensitiveFileNames) {
+        // We watch a directory recursively if it contains a wildcard anywhere in a directory segment
+        // of the pattern:
+        //
+        //  /a/b/**/d   - Watch /a/b recursively to catch changes to any d in any subfolder recursively
+        //  /a/b/*/d    - Watch /a/b recursively to catch any d in any immediate subfolder, even if a new subfolder is added
+        //  /a/b        - Watch /a/b recursively to catch changes to anything in any recursive subfoler
+        //
+        // We watch a directory without recursion if it contains a wildcard in the file segment of
+        // the pattern:
+        //
+        //  /a/b/*      - Watch /a/b directly to catch any new file
+        //  /a/b/a?z    - Watch /a/b directly to catch any new file matching a?z
+        var rawExcludeRegex = ts.getRegularExpressionForWildcard(exclude, path, "exclude");
+        var excludeRegex = rawExcludeRegex && new RegExp(rawExcludeRegex, useCaseSensitiveFileNames ? "" : "i");
+        var wildcardDirectories = {};
+        if (include !== undefined) {
+            var recursiveKeys = [];
+            for (var _i = 0, include_1 = include; _i < include_1.length; _i++) {
+                var file = include_1[_i];
+                var spec = ts.normalizePath(ts.combinePaths(path, file));
+                if (excludeRegex && excludeRegex.test(spec)) {
+                    continue;
                 }
-            }
-            checkStrictModeFunctionName(node);
-            if (inStrictMode) {
-                checkStrictModeFunctionDeclaration(node);
-                bindBlockScopedDeclaration(node, 16, 67215791);
-            }
-            else {
-                declareSymbolAndAddToSymbolTable(node, 16, 67215791);
-            }
-        }
-        function bindFunctionExpression(node) {
-            if (!file.isDeclarationFile && !(node.flags & 4194304)) {
-                if (ts.isAsyncFunction(node)) {
-                    emitFlags |= 1024;
-                }
-            }
-            if (currentFlow) {
-                node.flowNode = currentFlow;
-            }
-            checkStrictModeFunctionName(node);
-            var bindingName = node.name ? node.name.escapedText : "__function";
-            return bindAnonymousDeclaration(node, 16, bindingName);
-        }
-        function bindPropertyOrMethodOrAccessor(node, symbolFlags, symbolExcludes) {
-            if (!file.isDeclarationFile && !(node.flags & 4194304) && ts.isAsyncFunction(node)) {
-                emitFlags |= 1024;
-            }
-            if (currentFlow && ts.isObjectLiteralOrClassExpressionMethod(node)) {
-                node.flowNode = currentFlow;
-            }
-            return ts.hasDynamicName(node)
-                ? bindAnonymousDeclaration(node, symbolFlags, "__computed")
-                : declareSymbolAndAddToSymbolTable(node, symbolFlags, symbolExcludes);
-        }
-        function getInferTypeContainer(node) {
-            var extendsType = ts.findAncestor(node, function (n) { return n.parent && ts.isConditionalTypeNode(n.parent) && n.parent.extendsType === n; });
-            return extendsType && extendsType.parent;
-        }
-        function bindTypeParameter(node) {
-            if (ts.isJSDocTemplateTag(node.parent)) {
-                var container_1 = ts.find(node.parent.parent.tags, ts.isJSDocTypeAlias) || ts.getHostSignatureFromJSDoc(node.parent);
-                if (container_1) {
-                    if (!container_1.locals) {
-                        container_1.locals = ts.createSymbolTable();
-                    }
-                    declareSymbol(container_1.locals, undefined, node, 262144, 67639784);
-                }
-                else {
-                    declareSymbolAndAddToSymbolTable(node, 262144, 67639784);
-                }
-            }
-            else if (node.parent.kind === 172) {
-                var container_2 = getInferTypeContainer(node.parent);
-                if (container_2) {
-                    if (!container_2.locals) {
-                        container_2.locals = ts.createSymbolTable();
-                    }
-                    declareSymbol(container_2.locals, undefined, node, 262144, 67639784);
-                }
-                else {
-                    bindAnonymousDeclaration(node, 262144, getDeclarationName(node));
-                }
-            }
-            else {
-                declareSymbolAndAddToSymbolTable(node, 262144, 67639784);
-            }
-        }
-        function shouldReportErrorOnModuleDeclaration(node) {
-            var instanceState = getModuleInstanceState(node);
-            return instanceState === 1 || (instanceState === 2 && !!options.preserveConstEnums);
-        }
-        function checkUnreachable(node) {
-            if (!(currentFlow.flags & 1)) {
-                return false;
-            }
-            if (currentFlow === unreachableFlow) {
-                var reportError = (ts.isStatementButNotDeclaration(node) && node.kind !== 215) ||
-                    node.kind === 235 ||
-                    (node.kind === 239 && shouldReportErrorOnModuleDeclaration(node)) ||
-                    (node.kind === 238 && (!ts.isConstEnumDeclaration(node) || options.preserveConstEnums));
-                if (reportError) {
-                    currentFlow = reportedUnreachableFlow;
-                    if (!options.allowUnreachableCode) {
-                        var isError = ts.unreachableCodeIsError(options) &&
-                            !(node.flags & 4194304) &&
-                            (!ts.isVariableStatement(node) ||
-                                !!(ts.getCombinedNodeFlags(node.declarationList) & 3) ||
-                                node.declarationList.declarations.some(function (d) { return !!d.initializer; }));
-                        errorOrSuggestionOnFirstToken(isError, node, ts.Diagnostics.Unreachable_code_detected);
+                var match = getWildcardDirectoryFromSpec(spec, useCaseSensitiveFileNames);
+                if (match) {
+                    var key = match.key, flags = match.flags;
+                    var existingFlags = wildcardDirectories[key];
+                    if (existingFlags === undefined || existingFlags < flags) {
+                        wildcardDirectories[key] = flags;
+                        if (flags === 1 /* Recursive */) {
+                            recursiveKeys.push(key);
+                        }
                     }
                 }
             }
-            return true;
-        }
-    }
-    function isExportsOrModuleExportsOrAlias(sourceFile, node) {
-        return ts.isExportsIdentifier(node) ||
-            ts.isModuleExportsPropertyAccessExpression(node) ||
-            ts.isIdentifier(node) && isNameOfExportsOrModuleExportsAliasDeclaration(sourceFile, node);
-    }
-    ts.isExportsOrModuleExportsOrAlias = isExportsOrModuleExportsOrAlias;
-    function isNameOfExportsOrModuleExportsAliasDeclaration(sourceFile, node) {
-        var symbol = lookupSymbolForNameWorker(sourceFile, node.escapedText);
-        return !!symbol && !!symbol.valueDeclaration && ts.isVariableDeclaration(symbol.valueDeclaration) &&
-            !!symbol.valueDeclaration.initializer && isExportsOrModuleExportsOrAliasOrAssignment(sourceFile, symbol.valueDeclaration.initializer);
-    }
-    function isExportsOrModuleExportsOrAliasOrAssignment(sourceFile, node) {
-        return isExportsOrModuleExportsOrAlias(sourceFile, node) ||
-            (ts.isAssignmentExpression(node, true) && (isExportsOrModuleExportsOrAliasOrAssignment(sourceFile, node.left) || isExportsOrModuleExportsOrAliasOrAssignment(sourceFile, node.right)));
-    }
-    function lookupSymbolForNameWorker(container, name) {
-        var local = container.locals && container.locals.get(name);
-        if (local) {
-            return local.exportSymbol || local;
-        }
-        return container.symbol && container.symbol.exports && container.symbol.exports.get(name);
-    }
-    function computeTransformFlagsForNode(node, subtreeFlags) {
-        var kind = node.kind;
-        switch (kind) {
-            case 187:
-                return computeCallExpression(node, subtreeFlags);
-            case 188:
-                return computeNewExpression(node, subtreeFlags);
-            case 239:
-                return computeModuleDeclaration(node, subtreeFlags);
-            case 191:
-                return computeParenthesizedExpression(node, subtreeFlags);
-            case 200:
-                return computeBinaryExpression(node, subtreeFlags);
-            case 216:
-                return computeExpressionStatement(node, subtreeFlags);
-            case 149:
-                return computeParameter(node, subtreeFlags);
-            case 193:
-                return computeArrowFunction(node, subtreeFlags);
-            case 192:
-                return computeFunctionExpression(node, subtreeFlags);
-            case 234:
-                return computeFunctionDeclaration(node, subtreeFlags);
-            case 232:
-                return computeVariableDeclaration(node, subtreeFlags);
-            case 233:
-                return computeVariableDeclarationList(node, subtreeFlags);
-            case 214:
-                return computeVariableStatement(node, subtreeFlags);
-            case 228:
-                return computeLabeledStatement(node, subtreeFlags);
-            case 235:
-                return computeClassDeclaration(node, subtreeFlags);
-            case 205:
-                return computeClassExpression(node, subtreeFlags);
-            case 268:
-                return computeHeritageClause(node, subtreeFlags);
-            case 269:
-                return computeCatchClause(node, subtreeFlags);
-            case 207:
-                return computeExpressionWithTypeArguments(node, subtreeFlags);
-            case 155:
-                return computeConstructor(node, subtreeFlags);
-            case 152:
-                return computePropertyDeclaration(node, subtreeFlags);
-            case 154:
-                return computeMethod(node, subtreeFlags);
-            case 156:
-            case 157:
-                return computeAccessor(node, subtreeFlags);
-            case 243:
-                return computeImportEquals(node, subtreeFlags);
-            case 185:
-                return computePropertyAccess(node, subtreeFlags);
-            case 186:
-                return computeElementAccess(node, subtreeFlags);
-            default:
-                return computeOther(node, kind, subtreeFlags);
-        }
-    }
-    ts.computeTransformFlagsForNode = computeTransformFlagsForNode;
-    function computeCallExpression(node, subtreeFlags) {
-        var transformFlags = subtreeFlags;
-        var expression = node.expression;
-        if (node.typeArguments) {
-            transformFlags |= 3;
-        }
-        if (subtreeFlags & 524288
-            || (expression.transformFlags & (134217728 | 268435456))) {
-            transformFlags |= 192;
-            if (expression.transformFlags & 268435456) {
-                transformFlags |= 16384;
+            // Remove any subpaths under an existing recursively watched directory.
+            for (var key in wildcardDirectories) {
+                if (ts.hasProperty(wildcardDirectories, key)) {
+                    for (var _a = 0, recursiveKeys_1 = recursiveKeys; _a < recursiveKeys_1.length; _a++) {
+                        var recursiveKey = recursiveKeys_1[_a];
+                        if (key !== recursiveKey && ts.containsPath(recursiveKey, key, path, !useCaseSensitiveFileNames)) {
+                            delete wildcardDirectories[key];
+                        }
+                    }
+                }
             }
         }
-        if (expression.kind === 91) {
-            transformFlags |= 67108864;
-            if (subtreeFlags & 16384) {
-                transformFlags |= 32768;
-            }
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~940049729;
+        return wildcardDirectories;
     }
-    function computeNewExpression(node, subtreeFlags) {
-        var transformFlags = subtreeFlags;
-        if (node.typeArguments) {
-            transformFlags |= 3;
-        }
-        if (subtreeFlags & 524288) {
-            transformFlags |= 192;
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~940049729;
-    }
-    function computeBinaryExpression(node, subtreeFlags) {
-        var transformFlags = subtreeFlags;
-        var operatorTokenKind = node.operatorToken.kind;
-        var leftKind = node.left.kind;
-        if (operatorTokenKind === 58 && leftKind === 184) {
-            transformFlags |= 8 | 192 | 3072;
-        }
-        else if (operatorTokenKind === 58 && leftKind === 183) {
-            transformFlags |= 192 | 3072;
-        }
-        else if (operatorTokenKind === 40
-            || operatorTokenKind === 62) {
-            transformFlags |= 32;
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~939525441;
-    }
-    function computeParameter(node, subtreeFlags) {
-        var transformFlags = subtreeFlags;
-        var name = node.name;
-        var initializer = node.initializer;
-        var dotDotDotToken = node.dotDotDotToken;
-        if (node.questionToken
-            || node.type
-            || subtreeFlags & 4096
-            || ts.isThisIdentifier(name)) {
-            transformFlags |= 3;
-        }
-        if (ts.hasModifier(node, 92)) {
-            transformFlags |= 3 | 262144;
-        }
-        if (subtreeFlags & 1048576) {
-            transformFlags |= 8;
-        }
-        if (subtreeFlags & 8388608 || initializer || dotDotDotToken) {
-            transformFlags |= 192 | 131072;
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~939525441;
-    }
-    function computeParenthesizedExpression(node, subtreeFlags) {
-        var transformFlags = subtreeFlags;
-        var expression = node.expression;
-        var expressionKind = expression.kind;
-        var expressionTransformFlags = expression.transformFlags;
-        if (expressionKind === 208
-            || expressionKind === 190) {
-            transformFlags |= 3;
-        }
-        if (expressionTransformFlags & 1024) {
-            transformFlags |= 1024;
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~536872257;
-    }
-    function computeClassDeclaration(node, subtreeFlags) {
-        var transformFlags;
-        if (ts.hasModifier(node, 2)) {
-            transformFlags = 3;
-        }
-        else {
-            transformFlags = subtreeFlags | 192;
-            if ((subtreeFlags & 274432)
-                || node.typeParameters) {
-                transformFlags |= 3;
-            }
-            if (subtreeFlags & 65536) {
-                transformFlags |= 16384;
-            }
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~942011713;
-    }
-    function computeClassExpression(node, subtreeFlags) {
-        var transformFlags = subtreeFlags | 192;
-        if (subtreeFlags & 274432
-            || node.typeParameters) {
-            transformFlags |= 3;
-        }
-        if (subtreeFlags & 65536) {
-            transformFlags |= 16384;
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~942011713;
-    }
-    function computeHeritageClause(node, subtreeFlags) {
-        var transformFlags = subtreeFlags;
-        switch (node.token) {
-            case 85:
-                transformFlags |= 192;
-                break;
-            case 108:
-                transformFlags |= 3;
-                break;
-            default:
-                ts.Debug.fail("Unexpected token for heritage clause");
-                break;
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~939525441;
-    }
-    function computeCatchClause(node, subtreeFlags) {
-        var transformFlags = subtreeFlags;
-        if (!node.variableDeclaration) {
-            transformFlags |= 8;
-        }
-        else if (ts.isBindingPattern(node.variableDeclaration.name)) {
-            transformFlags |= 192;
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~940574017;
-    }
-    function computeExpressionWithTypeArguments(node, subtreeFlags) {
-        var transformFlags = subtreeFlags | 192;
-        if (node.typeArguments) {
-            transformFlags |= 3;
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~939525441;
-    }
-    function computeConstructor(node, subtreeFlags) {
-        var transformFlags = subtreeFlags;
-        if (ts.hasModifier(node, 2270)
-            || !node.body) {
-            transformFlags |= 3;
-        }
-        if (subtreeFlags & 1048576) {
-            transformFlags |= 8;
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~1003668801;
-    }
-    function computeMethod(node, subtreeFlags) {
-        var transformFlags = subtreeFlags | 192;
-        if (node.decorators
-            || ts.hasModifier(node, 2270)
-            || node.typeParameters
-            || node.type
-            || (node.name && ts.isComputedPropertyName(node.name))
-            || !node.body) {
-            transformFlags |= 3;
-        }
-        if (subtreeFlags & 1048576) {
-            transformFlags |= 8;
-        }
-        if (ts.hasModifier(node, 256)) {
-            transformFlags |= node.asteriskToken ? 8 : 16;
-        }
-        if (node.asteriskToken) {
-            transformFlags |= 768;
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~1003668801;
-    }
-    function computeAccessor(node, subtreeFlags) {
-        var transformFlags = subtreeFlags;
-        if (node.decorators
-            || ts.hasModifier(node, 2270)
-            || node.type
-            || (node.name && ts.isComputedPropertyName(node.name))
-            || !node.body) {
-            transformFlags |= 3;
-        }
-        if (subtreeFlags & 1048576) {
-            transformFlags |= 8;
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~1003668801;
-    }
-    function computePropertyDeclaration(node, subtreeFlags) {
-        var transformFlags = subtreeFlags | 3;
-        if (node.initializer || ts.isComputedPropertyName(node.name)) {
-            transformFlags |= 8192;
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~939525441;
-    }
-    function computeFunctionDeclaration(node, subtreeFlags) {
-        var transformFlags;
-        var modifierFlags = ts.getModifierFlags(node);
-        var body = node.body;
-        if (!body || (modifierFlags & 2)) {
-            transformFlags = 3;
-        }
-        else {
-            transformFlags = subtreeFlags | 33554432;
-            if (modifierFlags & 2270
-                || node.typeParameters
-                || node.type) {
-                transformFlags |= 3;
-            }
-            if (modifierFlags & 256) {
-                transformFlags |= node.asteriskToken ? 8 : 16;
-            }
-            if (subtreeFlags & 1048576) {
-                transformFlags |= 8;
-            }
-            if (subtreeFlags & 163840) {
-                transformFlags |= 192;
-            }
-            if (node.asteriskToken) {
-                transformFlags |= 768;
-            }
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~1003935041;
-    }
-    function computeFunctionExpression(node, subtreeFlags) {
-        var transformFlags = subtreeFlags;
-        if (ts.hasModifier(node, 2270)
-            || node.typeParameters
-            || node.type) {
-            transformFlags |= 3;
-        }
-        if (ts.hasModifier(node, 256)) {
-            transformFlags |= node.asteriskToken ? 8 : 16;
-        }
-        if (subtreeFlags & 1048576) {
-            transformFlags |= 8;
-        }
-        if (subtreeFlags & 163840) {
-            transformFlags |= 192;
-        }
-        if (node.asteriskToken) {
-            transformFlags |= 768;
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~1003935041;
-    }
-    function computeArrowFunction(node, subtreeFlags) {
-        var transformFlags = subtreeFlags | 192;
-        if (ts.hasModifier(node, 2270)
-            || node.typeParameters
-            || node.type) {
-            transformFlags |= 3;
-        }
-        if (ts.hasModifier(node, 256)) {
-            transformFlags |= 16;
-        }
-        if (subtreeFlags & 1048576) {
-            transformFlags |= 8;
-        }
-        if (subtreeFlags & 16384) {
-            transformFlags |= 32768;
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~1003902273;
-    }
-    function computePropertyAccess(node, subtreeFlags) {
-        var transformFlags = subtreeFlags;
-        if (transformFlags & 134217728) {
-            transformFlags ^= 134217728;
-            transformFlags |= 268435456;
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~671089985;
-    }
-    function computeElementAccess(node, subtreeFlags) {
-        var transformFlags = subtreeFlags;
-        var expression = node.expression;
-        var expressionFlags = expression.transformFlags;
-        if (expressionFlags & 134217728) {
-            transformFlags &= ~134217728;
-            transformFlags |= 268435456;
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~671089985;
-    }
-    function computeVariableDeclaration(node, subtreeFlags) {
-        var transformFlags = subtreeFlags;
-        transformFlags |= 192 | 8388608;
-        if (subtreeFlags & 1048576) {
-            transformFlags |= 8;
-        }
-        if (node.type) {
-            transformFlags |= 3;
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~939525441;
-    }
-    function computeVariableStatement(node, subtreeFlags) {
-        var transformFlags;
-        var declarationListTransformFlags = node.declarationList.transformFlags;
-        if (ts.hasModifier(node, 2)) {
-            transformFlags = 3;
-        }
-        else {
-            transformFlags = subtreeFlags;
-            if (declarationListTransformFlags & 8388608) {
-                transformFlags |= 192;
-            }
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~939525441;
-    }
-    function computeLabeledStatement(node, subtreeFlags) {
-        var transformFlags = subtreeFlags;
-        if (subtreeFlags & 4194304
-            && ts.isIterationStatement(node, true)) {
-            transformFlags |= 192;
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~939525441;
-    }
-    function computeImportEquals(node, subtreeFlags) {
-        var transformFlags = subtreeFlags;
-        if (!ts.isExternalModuleImportEqualsDeclaration(node)) {
-            transformFlags |= 3;
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~939525441;
-    }
-    function computeExpressionStatement(node, subtreeFlags) {
-        var transformFlags = subtreeFlags;
-        if (node.expression.transformFlags & 1024) {
-            transformFlags |= 192;
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~939525441;
-    }
-    function computeModuleDeclaration(node, subtreeFlags) {
-        var transformFlags = 3;
-        var modifierFlags = ts.getModifierFlags(node);
-        if ((modifierFlags & 2) === 0) {
-            transformFlags |= subtreeFlags;
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~977327425;
-    }
-    function computeVariableDeclarationList(node, subtreeFlags) {
-        var transformFlags = subtreeFlags | 33554432;
-        if (subtreeFlags & 8388608) {
-            transformFlags |= 192;
-        }
-        if (node.flags & 3) {
-            transformFlags |= 192 | 4194304;
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~948962625;
-    }
-    function computeOther(node, kind, subtreeFlags) {
-        var transformFlags = subtreeFlags;
-        var excludeFlags = 939525441;
-        switch (kind) {
-            case 120:
-            case 197:
-                transformFlags |= 8 | 16;
-                break;
-            case 190:
-            case 208:
-            case 301:
-                transformFlags |= 3;
-                excludeFlags = 536872257;
-                break;
-            case 114:
-            case 112:
-            case 113:
-            case 117:
-            case 124:
-            case 76:
-            case 238:
-            case 273:
-            case 209:
-            case 132:
-                transformFlags |= 3;
-                break;
-            case 255:
-            case 256:
-            case 257:
-            case 10:
-            case 258:
-            case 259:
-            case 260:
-            case 261:
-            case 262:
-            case 263:
-            case 264:
-            case 265:
-                transformFlags |= 4;
-                break;
-            case 13:
-            case 14:
-            case 15:
-            case 16:
-            case 202:
-            case 189:
-            case 271:
-            case 115:
-            case 210:
-                transformFlags |= 192;
-                break;
-            case 9:
-                if (node.hasExtendedUnicodeEscape) {
-                    transformFlags |= 192;
-                }
-                break;
-            case 8:
-                if (node.numericLiteralFlags & 384) {
-                    transformFlags |= 192;
-                }
-                break;
-            case 222:
-                if (node.awaitModifier) {
-                    transformFlags |= 8;
-                }
-                transformFlags |= 192;
-                break;
-            case 203:
-                transformFlags |= 8 | 192 | 16777216;
-                break;
-            case 119:
-            case 134:
-            case 131:
-            case 135:
-            case 137:
-            case 122:
-            case 138:
-            case 105:
-            case 148:
-            case 151:
-            case 153:
-            case 158:
-            case 159:
-            case 160:
-            case 161:
-            case 162:
-            case 163:
-            case 164:
-            case 165:
-            case 166:
-            case 167:
-            case 168:
-            case 169:
-            case 170:
-            case 171:
-            case 172:
-            case 173:
-            case 236:
-            case 237:
-            case 174:
-            case 175:
-            case 176:
-            case 177:
-            case 178:
-            case 242:
-                transformFlags = 3;
-                excludeFlags = -3;
-                break;
-            case 147:
-                transformFlags |= 2097152;
-                if (subtreeFlags & 16384) {
-                    transformFlags |= 65536;
-                }
-                break;
-            case 204:
-                transformFlags |= 192 | 524288;
-                break;
-            case 272:
-                transformFlags |= 8 | 1048576;
-                break;
-            case 97:
-                transformFlags |= 192 | 134217728;
-                excludeFlags = 536872257;
-                break;
-            case 99:
-                transformFlags |= 16384;
-                break;
-            case 180:
-                transformFlags |= 192 | 8388608;
-                if (subtreeFlags & 524288) {
-                    transformFlags |= 8 | 1048576;
-                }
-                excludeFlags = 940049729;
-                break;
-            case 181:
-                transformFlags |= 192 | 8388608;
-                excludeFlags = 940049729;
-                break;
-            case 182:
-                transformFlags |= 192;
-                if (node.dotDotDotToken) {
-                    transformFlags |= 524288;
-                }
-                break;
-            case 150:
-                transformFlags |= 3 | 4096;
-                break;
-            case 184:
-                excludeFlags = 942740801;
-                if (subtreeFlags & 2097152) {
-                    transformFlags |= 192;
-                }
-                if (subtreeFlags & 65536) {
-                    transformFlags |= 16384;
-                }
-                if (subtreeFlags & 1048576) {
-                    transformFlags |= 8;
-                }
-                break;
-            case 183:
-            case 188:
-                excludeFlags = 940049729;
-                if (subtreeFlags & 524288) {
-                    transformFlags |= 192;
-                }
-                break;
-            case 218:
-            case 219:
-            case 220:
-            case 221:
-                if (subtreeFlags & 4194304) {
-                    transformFlags |= 192;
-                }
-                break;
-            case 274:
-                if (subtreeFlags & 32768) {
-                    transformFlags |= 192;
-                }
-                break;
-            case 225:
-                transformFlags |= 33554432 | 8;
-                break;
-            case 223:
-            case 224:
-                transformFlags |= 33554432;
-                break;
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~excludeFlags;
-    }
-    function getTransformFlagsSubtreeExclusions(kind) {
-        if (kind >= 161 && kind <= 179) {
-            return -3;
-        }
-        switch (kind) {
-            case 187:
-            case 188:
-            case 183:
-                return 940049729;
-            case 239:
-                return 977327425;
-            case 149:
-                return 939525441;
-            case 193:
-                return 1003902273;
-            case 192:
-            case 234:
-                return 1003935041;
-            case 233:
-                return 948962625;
-            case 235:
-            case 205:
-                return 942011713;
-            case 155:
-                return 1003668801;
-            case 154:
-            case 156:
-            case 157:
-                return 1003668801;
-            case 119:
-            case 134:
-            case 131:
-            case 137:
-            case 135:
-            case 122:
-            case 138:
-            case 105:
-            case 148:
-            case 151:
-            case 153:
-            case 158:
-            case 159:
-            case 160:
-            case 236:
-            case 237:
-                return -3;
-            case 184:
-                return 942740801;
-            case 269:
-                return 940574017;
-            case 180:
-            case 181:
-                return 940049729;
-            case 190:
-            case 208:
-            case 301:
-            case 191:
-            case 97:
-                return 536872257;
-            case 185:
-            case 186:
-                return 671089985;
-            default:
-                return 939525441;
-        }
-    }
-    ts.getTransformFlagsSubtreeExclusions = getTransformFlagsSubtreeExclusions;
-    function setParentPointers(parent, child) {
-        child.parent = parent;
-        ts.forEachChild(child, function (grandchild) { return setParentPointers(child, grandchild); });
-    }
-})(ts || (ts = {}));
-var ts;
-(function (ts) {
-    function createGetSymbolWalker(getRestTypeOfSignature, getTypePredicateOfSignature, getReturnTypeOfSignature, getBaseTypes, resolveStructuredTypeMembers, getTypeOfSymbol, getResolvedSymbol, getIndexTypeOfStructuredType, getConstraintFromTypeParameter, getFirstIdentifier) {
-        return getSymbolWalker;
-        function getSymbolWalker(accept) {
-            if (accept === void 0) { accept = function () { return true; }; }
-            var visitedTypes = [];
-            var visitedSymbols = [];
+    function getWildcardDirectoryFromSpec(spec, useCaseSensitiveFileNames) {
+        var match = wildcardDirectoryPattern.exec(spec);
+        if (match) {
             return {
-                walkType: function (type) {
-                    try {
-                        visitType(type);
-                        return { visitedTypes: ts.getOwnValues(visitedTypes), visitedSymbols: ts.getOwnValues(visitedSymbols) };
-                    }
-                    finally {
-                        ts.clear(visitedTypes);
-                        ts.clear(visitedSymbols);
-                    }
-                },
-                walkSymbol: function (symbol) {
-                    try {
-                        visitSymbol(symbol);
-                        return { visitedTypes: ts.getOwnValues(visitedTypes), visitedSymbols: ts.getOwnValues(visitedSymbols) };
-                    }
-                    finally {
-                        ts.clear(visitedTypes);
-                        ts.clear(visitedSymbols);
-                    }
-                },
+                key: useCaseSensitiveFileNames ? match[0] : match[0].toLowerCase(),
+                flags: watchRecursivePattern.test(spec) ? 1 /* Recursive */ : 0 /* None */
             };
-            function visitType(type) {
-                if (!type) {
-                    return;
-                }
-                if (visitedTypes[type.id]) {
-                    return;
-                }
-                visitedTypes[type.id] = type;
-                var shouldBail = visitSymbol(type.symbol);
-                if (shouldBail)
-                    return;
-                if (type.flags & 131072) {
-                    var objectType = type;
-                    var objectFlags = objectType.objectFlags;
-                    if (objectFlags & 4) {
-                        visitTypeReference(type);
-                    }
-                    if (objectFlags & 32) {
-                        visitMappedType(type);
-                    }
-                    if (objectFlags & (1 | 2)) {
-                        visitInterfaceType(type);
-                    }
-                    if (objectFlags & (8 | 16)) {
-                        visitObjectType(objectType);
-                    }
-                }
-                if (type.flags & 65536) {
-                    visitTypeParameter(type);
-                }
-                if (type.flags & 786432) {
-                    visitUnionOrIntersectionType(type);
-                }
-                if (type.flags & 1048576) {
-                    visitIndexType(type);
-                }
-                if (type.flags & 2097152) {
-                    visitIndexedAccessType(type);
-                }
-            }
-            function visitTypeReference(type) {
-                visitType(type.target);
-                ts.forEach(type.typeArguments, visitType);
-            }
-            function visitTypeParameter(type) {
-                visitType(getConstraintFromTypeParameter(type));
-            }
-            function visitUnionOrIntersectionType(type) {
-                ts.forEach(type.types, visitType);
-            }
-            function visitIndexType(type) {
-                visitType(type.type);
-            }
-            function visitIndexedAccessType(type) {
-                visitType(type.objectType);
-                visitType(type.indexType);
-                visitType(type.constraint);
-            }
-            function visitMappedType(type) {
-                visitType(type.typeParameter);
-                visitType(type.constraintType);
-                visitType(type.templateType);
-                visitType(type.modifiersType);
-            }
-            function visitSignature(signature) {
-                var typePredicate = getTypePredicateOfSignature(signature);
-                if (typePredicate) {
-                    visitType(typePredicate.type);
-                }
-                ts.forEach(signature.typeParameters, visitType);
-                for (var _i = 0, _a = signature.parameters; _i < _a.length; _i++) {
-                    var parameter = _a[_i];
-                    visitSymbol(parameter);
-                }
-                visitType(getRestTypeOfSignature(signature));
-                visitType(getReturnTypeOfSignature(signature));
-            }
-            function visitInterfaceType(interfaceT) {
-                visitObjectType(interfaceT);
-                ts.forEach(interfaceT.typeParameters, visitType);
-                ts.forEach(getBaseTypes(interfaceT), visitType);
-                visitType(interfaceT.thisType);
-            }
-            function visitObjectType(type) {
-                var stringIndexType = getIndexTypeOfStructuredType(type, 0);
-                visitType(stringIndexType);
-                var numberIndexType = getIndexTypeOfStructuredType(type, 1);
-                visitType(numberIndexType);
-                var resolved = resolveStructuredTypeMembers(type);
-                for (var _i = 0, _a = resolved.callSignatures; _i < _a.length; _i++) {
-                    var signature = _a[_i];
-                    visitSignature(signature);
-                }
-                for (var _b = 0, _c = resolved.constructSignatures; _b < _c.length; _b++) {
-                    var signature = _c[_b];
-                    visitSignature(signature);
-                }
-                for (var _d = 0, _e = resolved.properties; _d < _e.length; _d++) {
-                    var p = _e[_d];
-                    visitSymbol(p);
-                }
-            }
-            function visitSymbol(symbol) {
-                if (!symbol) {
-                    return false;
-                }
-                var symbolId = ts.getSymbolId(symbol);
-                if (visitedSymbols[symbolId]) {
-                    return false;
-                }
-                visitedSymbols[symbolId] = symbol;
-                if (!accept(symbol)) {
-                    return true;
-                }
-                var t = getTypeOfSymbol(symbol);
-                visitType(t);
-                if (symbol.flags & 1952) {
-                    symbol.exports.forEach(visitSymbol);
-                }
-                ts.forEach(symbol.declarations, function (d) {
-                    if (d.type && d.type.kind === 165) {
-                        var query = d.type;
-                        var entity = getResolvedSymbol(getFirstIdentifier(query.exprName));
-                        visitSymbol(entity);
-                    }
-                });
-                return false;
+        }
+        if (ts.isImplicitGlob(spec)) {
+            return { key: spec, flags: 1 /* Recursive */ };
+        }
+        return undefined;
+    }
+    /**
+     * Determines whether a literal or wildcard file has already been included that has a higher
+     * extension priority.
+     *
+     * @param file The path to the file.
+     * @param extensionPriority The priority of the extension.
+     * @param context The expansion context.
+     */
+    function hasFileWithHigherPriorityExtension(file, literalFiles, wildcardFiles, extensions, keyMapper) {
+        var extensionPriority = ts.getExtensionPriority(file, extensions);
+        var adjustedExtensionPriority = ts.adjustExtensionPriority(extensionPriority, extensions);
+        for (var i = 0 /* Highest */; i < adjustedExtensionPriority; i++) {
+            var higherPriorityExtension = extensions[i];
+            var higherPriorityPath = keyMapper(ts.changeExtension(file, higherPriorityExtension));
+            if (literalFiles.has(higherPriorityPath) || wildcardFiles.has(higherPriorityPath)) {
+                return true;
             }
         }
+        return false;
+    }
+    /**
+     * Removes files included via wildcard expansion with a lower extension priority that have
+     * already been included.
+     *
+     * @param file The path to the file.
+     * @param extensionPriority The priority of the extension.
+     * @param context The expansion context.
+     */
+    function removeWildcardFilesWithLowerPriorityExtension(file, wildcardFiles, extensions, keyMapper) {
+        var extensionPriority = ts.getExtensionPriority(file, extensions);
+        var nextExtensionPriority = ts.getNextLowestExtensionPriority(extensionPriority, extensions);
+        for (var i = nextExtensionPriority; i < extensions.length; i++) {
+            var lowerPriorityExtension = extensions[i];
+            var lowerPriorityPath = keyMapper(ts.changeExtension(file, lowerPriorityExtension));
+            wildcardFiles.delete(lowerPriorityPath);
+        }
+    }
+    /**
+     * Produces a cleaned version of compiler options with personally identifiying info (aka, paths) removed.
+     * Also converts enum values back to strings.
+     */
+    /* @internal */
+    function convertCompilerOptionsForTelemetry(opts) {
+        var out = {};
+        for (var key in opts) {
+            if (opts.hasOwnProperty(key)) {
+                var type = getOptionFromName(key);
+                if (type !== undefined) { // Ignore unknown options
+                    out[key] = getOptionValueWithEmptyStrings(opts[key], type);
+                }
+            }
+        }
+        return out;
+    }
+    ts.convertCompilerOptionsForTelemetry = convertCompilerOptionsForTelemetry;
+    function getOptionValueWithEmptyStrings(value, option) {
+        switch (option.type) {
+            case "object": // "paths". Can't get any useful information from the value since we blank out strings, so just return "".
+                return "";
+            case "string": // Could be any arbitrary string -- use empty string instead.
+                return "";
+            case "number": // Allow numbers, but be sure to check it's actually a number.
+                return typeof value === "number" ? value : "";
+            case "boolean":
+                return typeof value === "boolean" ? value : "";
+            case "list":
+                var elementType_1 = option.element;
+                return ts.isArray(value) ? value.map(function (v) { return getOptionValueWithEmptyStrings(v, elementType_1); }) : "";
+            default:
+                return ts.forEachEntry(option.type, function (optionEnumValue, optionStringValue) {
+                    if (optionEnumValue === value) {
+                        return optionStringValue;
+                    }
+                }); // TODO: GH#18217
+        }
     }
-    ts.createGetSymbolWalker = createGetSymbolWalker;
 })(ts || (ts = {}));
 var ts;
 (function (ts) {
@@ -20509,6 +24220,7 @@ var ts;
         host.trace(ts.formatMessage.apply(undefined, arguments));
     }
     ts.trace = trace;
+    /* @internal */
     function isTraceEnabled(compilerOptions, host) {
         return !!compilerOptions.traceResolution && host.trace !== undefined;
     }
@@ -20517,15 +24229,20 @@ var ts;
         return r && { path: r.path, extension: r.ext, packageId: packageId };
     }
     function noPackageId(r) {
-        return withPackageId(undefined, r);
+        return withPackageId(/*packageId*/ undefined, r);
     }
+    /**
+     * Kinds of file that we are currently looking for.
+     * Typically there is one pass with Extensions.TypeScript, then a second pass with Extensions.JavaScript.
+     */
     var Extensions;
     (function (Extensions) {
         Extensions[Extensions["TypeScript"] = 0] = "TypeScript";
         Extensions[Extensions["JavaScript"] = 1] = "JavaScript";
         Extensions[Extensions["Json"] = 2] = "Json";
-        Extensions[Extensions["DtsOnly"] = 3] = "DtsOnly";
+        Extensions[Extensions["DtsOnly"] = 3] = "DtsOnly"; /** Only '.d.ts' */
     })(Extensions || (Extensions = {}));
+    /** Used with `Extensions.DtsOnly` to extract the path from TypeScript results. */
     function resolvedTypeScriptOnly(resolved) {
         if (!resolved) {
             return undefined;
@@ -20539,6 +24256,7 @@ var ts;
             failedLookupLocations: failedLookupLocations
         };
     }
+    /** Reads from "main" or "types"/"typings" depending on `extensions`. */
     function tryReadPackageJsonFields(readTypes, jsonContent, baseDirectory, state) {
         return readTypes ? tryReadFromField("typings") || tryReadFromField("types") : tryReadFromField("main");
         function tryReadFromField(fieldName) {
@@ -20562,6 +24280,7 @@ var ts;
             return path;
         }
     }
+    /* @internal */
     function readJson(path, host) {
         try {
             var jsonText = host.readFile(path);
@@ -20574,6 +24293,7 @@ var ts;
             return result.config;
         }
         catch (e) {
+            // gracefully handle if readFile fails or returns not JSON
             return {};
         }
     }
@@ -20594,9 +24314,14 @@ var ts;
         }
     }
     ts.getEffectiveTypeRoots = getEffectiveTypeRoots;
+    /**
+     * Returns the path to every node_modules/@types directory from some ancestor directory.
+     * Returns undefined if there are none.
+     */
     function getDefaultTypeRoots(currentDirectory, host) {
         if (!host.directoryExists) {
             return [ts.combinePaths(currentDirectory, nodeModulesAtTypes)];
+            // And if it doesn't exist, tough.
         }
         var typeRoots;
         ts.forEachAncestorDirectory(ts.normalizePath(currentDirectory), function (directory) {
@@ -20609,6 +24334,11 @@ var ts;
         return typeRoots;
     }
     var nodeModulesAtTypes = ts.combinePaths("node_modules", "@types");
+    /**
+     * @param {string | undefined} containingFile - file that contains type reference directive, can be undefined if containing file is unknown.
+     * This is possible in case if resolution is performed for directives specified via 'types' parameter. In this case initial path for secondary lookups
+     * is assumed to be the same as root directory of the project.
+     */
     function resolveTypeReferenceDirective(typeReferenceDirectiveName, containingFile, options, host) {
         var traceEnabled = isTraceEnabled(options, host);
         var moduleResolutionState = { compilerOptions: options, host: host, traceEnabled: traceEnabled };
@@ -20650,6 +24380,7 @@ var ts;
         }
         return { resolvedTypeReferenceDirective: resolvedTypeReferenceDirective, failedLookupLocations: failedLookupLocations };
         function primaryLookup() {
+            // Check primary library paths
             if (typeRoots && typeRoots.length) {
                 if (traceEnabled) {
                     trace(host, ts.Diagnostics.Resolving_with_primary_search_path_0, typeRoots.join(", "));
@@ -20673,10 +24404,11 @@ var ts;
         function secondaryLookup() {
             var initialLocationForSecondaryLookup = containingFile && ts.getDirectoryPath(containingFile);
             if (initialLocationForSecondaryLookup !== undefined) {
+                // check secondary locations
                 if (traceEnabled) {
                     trace(host, ts.Diagnostics.Looking_up_in_node_modules_folder_initial_location_0, initialLocationForSecondaryLookup);
                 }
-                var result = loadModuleFromNodeModules(Extensions.DtsOnly, typeReferenceDirectiveName, initialLocationForSecondaryLookup, failedLookupLocations, moduleResolutionState, undefined);
+                var result = loadModuleFromNodeModules(Extensions.DtsOnly, typeReferenceDirectiveName, initialLocationForSecondaryLookup, failedLookupLocations, moduleResolutionState, /*cache*/ undefined);
                 var resolvedFile = resolvedTypeScriptOnly(result && result.value);
                 if (!resolvedFile && traceEnabled) {
                     trace(host, ts.Diagnostics.Type_reference_directive_0_was_not_resolved, typeReferenceDirectiveName);
@@ -20691,10 +24423,20 @@ var ts;
         }
     }
     ts.resolveTypeReferenceDirective = resolveTypeReferenceDirective;
+    /**
+     * Given a set of options, returns the set of type directive names
+     *   that should be included for this program automatically.
+     * This list could either come from the config file,
+     *   or from enumerating the types root + initial secondary types lookup location.
+     * More type directives might appear in the program later as a result of loading actual source files;
+     *   this list is only the set of defaults that are implicitly included.
+     */
     function getAutomaticTypeDirectiveNames(options, host) {
+        // Use explicit type list from tsconfig.json
         if (options.types) {
             return options.types;
         }
+        // Walk the primary type lookup locations
         var result = [];
         if (host.directoryExists && host.getDirectories) {
             var typeRoots = getEffectiveTypeRoots(options, host);
@@ -20706,8 +24448,12 @@ var ts;
                             var typeDirectivePath = _b[_a];
                             var normalized = ts.normalizePath(typeDirectivePath);
                             var packageJsonPath = pathToPackageJson(ts.combinePaths(root, normalized));
+                            // `types-publisher` sometimes creates packages with `"typings": null` for packages that don't provide their own types.
+                            // See `createNotNeededPackageJSON` in the types-publisher` repo.
+                            // tslint:disable-next-line:no-null-keyword
                             var isNotNeededPackage = host.fileExists(packageJsonPath) && readJson(packageJsonPath, host).typings === null;
                             if (!isNotNeededPackage) {
+                                // Return just the type directive names
                                 result.push(ts.getBaseFileName(normalized));
                             }
                         }
@@ -20722,6 +24468,7 @@ var ts;
         return createModuleResolutionCacheWithMaps(ts.createMap(), ts.createMap(), currentDirectory, getCanonicalFileName);
     }
     ts.createModuleResolutionCache = createModuleResolutionCache;
+    /*@internal*/
     function createModuleResolutionCacheWithMaps(directoryToModuleNameMap, moduleNameToDirectoryMap, currentDirectory, getCanonicalFileName) {
         return { getOrCreateCacheForDirectory: getOrCreateCacheForDirectory, getOrCreateCacheForModuleName: getOrCreateCacheForModuleName };
         function getOrCreateCacheForDirectory(directoryName) {
@@ -20735,7 +24482,7 @@ var ts;
         }
         function getOrCreateCacheForModuleName(nonRelativeModuleName) {
             if (ts.isExternalModuleNameRelative(nonRelativeModuleName)) {
-                return undefined;
+                return undefined; // TODO: GH#18217
             }
             var perModuleNameCache = moduleNameToDirectoryMap.get(nonRelativeModuleName);
             if (!perModuleNameCache) {
@@ -20750,13 +24497,29 @@ var ts;
             function get(directory) {
                 return directoryPathMap.get(ts.toPath(directory, currentDirectory, getCanonicalFileName));
             }
+            /**
+             * At first this function add entry directory -> module resolution result to the table.
+             * Then it computes the set of parent folders for 'directory' that should have the same module resolution result
+             * and for every parent folder in set it adds entry: parent -> module resolution. .
+             * Lets say we first directory name: /a/b/c/d/e and resolution result is: /a/b/bar.ts.
+             * Set of parent folders that should have the same result will be:
+             * [
+             *     /a/b/c/d, /a/b/c, /a/b
+             * ]
+             * this means that request for module resolution from file in any of these folder will be immediately found in cache.
+             */
             function set(directory, result) {
                 var path = ts.toPath(directory, currentDirectory, getCanonicalFileName);
+                // if entry is already in cache do nothing
                 if (directoryPathMap.has(path)) {
                     return;
                 }
                 directoryPathMap.set(path, result);
                 var resolvedFileName = result.resolvedModule && result.resolvedModule.resolvedFileName;
+                // find common prefix between directory and resolved file name
+                // this common prefix should be the shorted path that has the same resolution
+                // directory: /a/b/c/d/e
+                // resolvedFileName: /a/b/foo.d.ts
                 var commonPrefix = getCommonPrefix(path, resolvedFileName);
                 var current = path;
                 while (true) {
@@ -20776,10 +24539,12 @@ var ts;
                     return undefined;
                 }
                 var resolutionDirectory = ts.toPath(ts.getDirectoryPath(resolution), currentDirectory, getCanonicalFileName);
+                // find first position where directory and resolution differs
                 var i = 0;
                 while (i < Math.min(directory.length, resolutionDirectory.length) && directory.charCodeAt(i) === resolutionDirectory.charCodeAt(i)) {
                     i++;
                 }
+                // find last directory separator before position i
                 var sep = directory.lastIndexOf(ts.directorySeparator, i);
                 if (sep < 0) {
                     return undefined;
@@ -20833,6 +24598,7 @@ var ts;
             }
             if (perFolderCache) {
                 perFolderCache.set(moduleName, result);
+                // put result in per-module name cache
                 var perModuleNameCache = cache.getOrCreateCacheForModuleName(moduleName);
                 if (perModuleNameCache) {
                     perModuleNameCache.set(containingDirectory, result);
@@ -20850,6 +24616,66 @@ var ts;
         return result;
     }
     ts.resolveModuleName = resolveModuleName;
+    /**
+     * Any module resolution kind can be augmented with optional settings: 'baseUrl', 'paths' and 'rootDirs' - they are used to
+     * mitigate differences between design time structure of the project and its runtime counterpart so the same import name
+     * can be resolved successfully by TypeScript compiler and runtime module loader.
+     * If these settings are set then loading procedure will try to use them to resolve module name and it can of failure it will
+     * fallback to standard resolution routine.
+     *
+     * - baseUrl - this setting controls how non-relative module names are resolved. If this setting is specified then non-relative
+     * names will be resolved relative to baseUrl: i.e. if baseUrl is '/a/b' then candidate location to resolve module name 'c/d' will
+     * be '/a/b/c/d'
+     * - paths - this setting can only be used when baseUrl is specified. allows to tune how non-relative module names
+     * will be resolved based on the content of the module name.
+     * Structure of 'paths' compiler options
+     * 'paths': {
+     *    pattern-1: [...substitutions],
+     *    pattern-2: [...substitutions],
+     *    ...
+     *    pattern-n: [...substitutions]
+     * }
+     * Pattern here is a string that can contain zero or one '*' character. During module resolution module name will be matched against
+     * all patterns in the list. Matching for patterns that don't contain '*' means that module name must be equal to pattern respecting the case.
+     * If pattern contains '*' then to match pattern "<prefix>*<suffix>" module name must start with the <prefix> and end with <suffix>.
+     * <MatchedStar> denotes part of the module name between <prefix> and <suffix>.
+     * If module name can be matches with multiple patterns then pattern with the longest prefix will be picked.
+     * After selecting pattern we'll use list of substitutions to get candidate locations of the module and the try to load module
+     * from the candidate location.
+     * Substitution is a string that can contain zero or one '*'. To get candidate location from substitution we'll pick every
+     * substitution in the list and replace '*' with <MatchedStar> string. If candidate location is not rooted it
+     * will be converted to absolute using baseUrl.
+     * For example:
+     * baseUrl: /a/b/c
+     * "paths": {
+     *     // match all module names
+     *     "*": [
+     *         "*",        // use matched name as is,
+     *                     // <matched name> will be looked as /a/b/c/<matched name>
+     *
+     *         "folder1/*" // substitution will convert matched name to 'folder1/<matched name>',
+     *                     // since it is not rooted then final candidate location will be /a/b/c/folder1/<matched name>
+     *     ],
+     *     // match module names that start with 'components/'
+     *     "components/*": [ "/root/components/*" ] // substitution will convert /components/folder1/<matched name> to '/root/components/folder1/<matched name>',
+     *                                              // it is rooted so it will be final candidate location
+     * }
+     *
+     * 'rootDirs' allows the project to be spreaded across multiple locations and resolve modules with relative names as if
+     * they were in the same location. For example lets say there are two files
+     * '/local/src/content/file1.ts'
+     * '/shared/components/contracts/src/content/protocols/file2.ts'
+     * After bundling content of '/shared/components/contracts/src' will be merged with '/local/src' so
+     * if file1 has the following import 'import {x} from "./protocols/file2"' it will be resolved successfully in runtime.
+     * 'rootDirs' provides the way to tell compiler that in order to get the whole project it should behave as if content of all
+     * root dirs were merged together.
+     * I.e. for the example above 'rootDirs' will have two entries: [ '/local/src', '/shared/components/contracts/src' ].
+     * Compiler will first convert './protocols/file2' into absolute path relative to the location of containing file:
+     * '/local/src/content/protocols/file2' and try to load it - failure.
+     * Then it will search 'rootDirs' looking for a longest matching prefix of this absolute path and if such prefix is found - absolute path will
+     * be converted to a path relative to found rootDir entry './content/protocols/file2' (*). As a last step compiler will check all remaining
+     * entries in 'rootDirs', use them to build absolute path out of (*) and try to resolve module from this location.
+     */
     function tryLoadModuleUsingOptionalResolutionSettings(extensions, moduleName, containingDirectory, loader, failedLookupLocations, state) {
         if (!ts.isExternalModuleNameRelative(moduleName)) {
             return tryLoadModuleUsingBaseUrl(extensions, moduleName, loader, failedLookupLocations, state);
@@ -20870,6 +24696,9 @@ var ts;
         var matchedNormalizedPrefix;
         for (var _i = 0, _a = state.compilerOptions.rootDirs; _i < _a.length; _i++) {
             var rootDir = _a[_i];
+            // rootDirs are expected to be absolute
+            // in case of tsconfig.json this will happen automatically - compiler will expand relative names
+            // using location of tsconfig.json as base location
             var normalizedRoot = ts.normalizePath(rootDir);
             if (!ts.endsWith(normalizedRoot, ts.directorySeparator)) {
                 normalizedRoot += ts.directorySeparator;
@@ -20889,6 +24718,7 @@ var ts;
                 trace(state.host, ts.Diagnostics.Longest_matching_prefix_for_0_is_1, candidate, matchedNormalizedPrefix);
             }
             var suffix = candidate.substr(matchedNormalizedPrefix.length);
+            // first - try to load from a initial location
             if (state.traceEnabled) {
                 trace(state.host, ts.Diagnostics.Loading_0_from_the_root_dir_1_candidate_location_2, suffix, matchedNormalizedPrefix, candidate);
             }
@@ -20899,9 +24729,11 @@ var ts;
             if (state.traceEnabled) {
                 trace(state.host, ts.Diagnostics.Trying_other_entries_in_rootDirs);
             }
+            // then try to resolve using remaining entries in rootDirs
             for (var _b = 0, _c = state.compilerOptions.rootDirs; _b < _c.length; _b++) {
                 var rootDir = _c[_b];
                 if (rootDir === matchedRootDir) {
+                    // skip the initially matched entry
                     continue;
                 }
                 var candidate_1 = ts.combinePaths(ts.normalizePath(rootDir), suffix);
@@ -20927,6 +24759,7 @@ var ts;
         if (state.traceEnabled) {
             trace(state.host, ts.Diagnostics.baseUrl_option_is_set_to_0_using_this_value_to_resolve_non_relative_module_name_1, state.compilerOptions.baseUrl, moduleName);
         }
+        // string is for exact match
         var matchedPattern;
         if (state.compilerOptions.paths) {
             if (state.traceEnabled) {
@@ -20946,9 +24779,10 @@ var ts;
                 if (state.traceEnabled) {
                     trace(state.host, ts.Diagnostics.Trying_substitution_0_candidate_module_location_Colon_1, subst, path);
                 }
+                // A path mapping may have an extension, in contrast to an import, which should omit it.
                 var extension = ts.tryGetExtensionFromPath(candidate);
                 if (extension !== undefined) {
-                    var path_1 = tryFile(candidate, failedLookupLocations, false, state);
+                    var path_1 = tryFile(candidate, failedLookupLocations, /*onlyRecordFailures*/ false, state);
                     if (path_1 !== undefined) {
                         return noPackageId({ path: path_1, ext: extension });
                     }
@@ -20965,11 +24799,17 @@ var ts;
         }
     }
     function nodeModuleNameResolver(moduleName, containingFile, compilerOptions, host, cache) {
-        return nodeModuleNameResolverWorker(moduleName, ts.getDirectoryPath(containingFile), compilerOptions, host, cache, false);
+        return nodeModuleNameResolverWorker(moduleName, ts.getDirectoryPath(containingFile), compilerOptions, host, cache, /*jsOnly*/ false);
     }
     ts.nodeModuleNameResolver = nodeModuleNameResolver;
+    /**
+     * Expose resolution logic to allow us to use Node module resolution logic from arbitrary locations.
+     * No way to do this with `require()`: https://github.com/nodejs/node/issues/5963
+     * Throws an error if the module can't be resolved.
+     */
+    /* @internal */
     function resolveJavaScriptModule(moduleName, initialDir, host) {
-        var _a = nodeModuleNameResolverWorker(moduleName, initialDir, { moduleResolution: ts.ModuleResolutionKind.NodeJs, allowJs: true }, host, undefined, true), resolvedModule = _a.resolvedModule, failedLookupLocations = _a.failedLookupLocations;
+        var _a = nodeModuleNameResolverWorker(moduleName, initialDir, { moduleResolution: ts.ModuleResolutionKind.NodeJs, allowJs: true }, host, /*cache*/ undefined, /*jsOnly*/ true), resolvedModule = _a.resolvedModule, failedLookupLocations = _a.failedLookupLocations;
         if (!resolvedModule) {
             throw new Error("Could not resolve JS module '" + moduleName + "' starting at '" + initialDir + "'. Looked in: " + failedLookupLocations.join(", "));
         }
@@ -20991,7 +24831,7 @@ var ts;
         }
         return { resolvedModule: undefined, failedLookupLocations: failedLookupLocations };
         function tryResolve(extensions) {
-            var loader = function (extensions, candidate, failedLookupLocations, onlyRecordFailures, state) { return nodeLoadModuleByRelativeName(extensions, candidate, failedLookupLocations, onlyRecordFailures, state, true); };
+            var loader = function (extensions, candidate, failedLookupLocations, onlyRecordFailures, state) { return nodeLoadModuleByRelativeName(extensions, candidate, failedLookupLocations, onlyRecordFailures, state, /*considerPackageJson*/ true); };
             var resolved = tryLoadModuleUsingOptionalResolutionSettings(extensions, moduleName, containingDirectory, loader, failedLookupLocations, state);
             if (resolved) {
                 return toSearchResult({ resolved: resolved, isExternalLibraryImport: false });
@@ -21013,11 +24853,13 @@ var ts;
                     }
                     resolvedValue = __assign({}, resolvedValue, { path: path });
                 }
+                // For node_modules lookups, get the real path so that multiple accesses to an `npm link`-ed module do not create duplicate files.
                 return { value: resolvedValue && { resolved: resolvedValue, originalPath: originalPath, isExternalLibraryImport: true } };
             }
             else {
                 var _a = ts.normalizePathAndParts(ts.combinePaths(containingDirectory, moduleName)), candidate = _a.path, parts = _a.parts;
-                var resolved_2 = nodeLoadModuleByRelativeName(extensions, candidate, failedLookupLocations, false, state, true);
+                var resolved_2 = nodeLoadModuleByRelativeName(extensions, candidate, failedLookupLocations, /*onlyRecordFailures*/ false, state, /*considerPackageJson*/ true);
+                // Treat explicit "node_modules" import as an external library import.
                 return resolved_2 && toSearchResult({ resolved: resolved_2, isExternalLibraryImport: ts.contains(parts, "node_modules") });
             }
         }
@@ -21030,7 +24872,7 @@ var ts;
         if (traceEnabled) {
             trace(host, ts.Diagnostics.Resolving_real_path_for_0_result_1, path, real);
         }
-        ts.Debug.assert(host.fileExists(real), path + " linked to nonexistent file " + real);
+        ts.Debug.assert(host.fileExists(real), path + " linked to nonexistent file " + real); // tslint:disable-line
         return real;
     }
     function nodeLoadModuleByRelativeName(extensions, candidate, failedLookupLocations, onlyRecordFailures, state, considerPackageJson) {
@@ -21050,7 +24892,7 @@ var ts;
             var resolvedFromFile = loadModuleFromFile(extensions, candidate, failedLookupLocations, onlyRecordFailures, state);
             if (resolvedFromFile) {
                 var nm = considerPackageJson ? parseNodeModuleFromPath(resolvedFromFile) : undefined;
-                var packageId = nm && getPackageJsonInfo(nm.packageDirectory, nm.subModuleName, failedLookupLocations, false, state).packageId;
+                var packageId = nm && getPackageJsonInfo(nm.packageDirectory, nm.subModuleName, failedLookupLocations, /*onlyRecordFailures*/ false, state).packageId;
                 return withPackageId(packageId, resolvedFromFile);
             }
         }
@@ -21066,6 +24908,17 @@ var ts;
         return loadNodeModuleFromDirectory(extensions, candidate, failedLookupLocations, onlyRecordFailures, state, considerPackageJson);
     }
     var nodeModulesPathPart = "/node_modules/";
+    /**
+     * This will be called on the successfully resolved path from `loadModuleFromFile`.
+     * (Not neeeded for `loadModuleFromNodeModules` as that looks up the `package.json` as part of resolution.)
+     *
+     * packageDirectory is the directory of the package itself.
+     * subModuleName is the path within the package.
+     *   For `blah/node_modules/foo/index.d.ts` this is { packageDirectory: "foo", subModuleName: "index.d.ts" }. (Part before "/node_modules/" is ignored.)
+     *   For `/node_modules/foo/bar.d.ts` this is { packageDirectory: "foo", subModuleName": "bar/index.d.ts" }.
+     *   For `/node_modules/@types/foo/bar/index.d.ts` this is { packageDirectory: "@types/foo", subModuleName: "bar/index.d.ts" }.
+     *   For `/node_modules/foo/bar/index.d.ts` this is { packageDirectory: "foo", subModuleName": "bar/index.d.ts" }.
+     */
     function parseNodeModuleFromPath(resolved) {
         var path = ts.normalizePath(resolved.path);
         var idx = path.lastIndexOf(nodeModulesPathPart);
@@ -21074,11 +24927,11 @@ var ts;
         }
         var indexAfterNodeModules = idx + nodeModulesPathPart.length;
         var indexAfterPackageName = moveToNextDirectorySeparatorIfAvailable(path, indexAfterNodeModules);
-        if (path.charCodeAt(indexAfterNodeModules) === 64) {
+        if (path.charCodeAt(indexAfterNodeModules) === 64 /* at */) {
             indexAfterPackageName = moveToNextDirectorySeparatorIfAvailable(path, indexAfterPackageName);
         }
         var packageDirectory = path.slice(0, indexAfterPackageName);
-        var subModuleName = ts.removeExtension(path.slice(indexAfterPackageName + 1), resolved.ext) + ".d.ts";
+        var subModuleName = ts.removeExtension(path.slice(indexAfterPackageName + 1), resolved.ext) + ".d.ts" /* Dts */;
         return { packageDirectory: packageDirectory, subModuleName: subModuleName };
     }
     function moveToNextDirectorySeparatorIfAvailable(path, prevSeparatorIndex) {
@@ -21097,22 +24950,31 @@ var ts;
         }
         return path + "/index.d.ts";
     }
+    /* @internal */
     function directoryProbablyExists(directoryName, host) {
+        // if host does not support 'directoryExists' assume that directory will exist
         return !host.directoryExists || host.directoryExists(directoryName);
     }
     ts.directoryProbablyExists = directoryProbablyExists;
     function loadModuleFromFileNoPackageId(extensions, candidate, failedLookupLocations, onlyRecordFailures, state) {
         return noPackageId(loadModuleFromFile(extensions, candidate, failedLookupLocations, onlyRecordFailures, state));
     }
+    /**
+     * @param {boolean} onlyRecordFailures - if true then function won't try to actually load files but instead record all attempts as failures. This flag is necessary
+     * in cases when we know upfront that all load attempts will fail (because containing folder does not exists) however we still need to record all failed lookup locations.
+     */
     function loadModuleFromFile(extensions, candidate, failedLookupLocations, onlyRecordFailures, state) {
         if (extensions === Extensions.Json) {
-            var extensionLess = ts.tryRemoveExtension(candidate, ".json");
+            var extensionLess = ts.tryRemoveExtension(candidate, ".json" /* Json */);
             return extensionLess === undefined ? undefined : tryAddingExtensions(extensionLess, extensions, failedLookupLocations, onlyRecordFailures, state);
         }
+        // First, try adding an extension. An import of "foo" could be matched by a file "foo.ts", or "foo.js" by "foo.js.ts"
         var resolvedByAddingExtension = tryAddingExtensions(candidate, extensions, failedLookupLocations, onlyRecordFailures, state);
         if (resolvedByAddingExtension) {
             return resolvedByAddingExtension;
         }
+        // If that didn't work, try stripping a ".js" or ".jsx" extension and replacing it with a TypeScript one;
+        // e.g. "./foo.js" can be matched by "./foo.ts" or "./foo.d.ts"
         if (ts.hasJavaScriptFileExtension(candidate)) {
             var extensionless = ts.removeFileExtension(candidate);
             if (state.traceEnabled) {
@@ -21122,28 +24984,31 @@ var ts;
             return tryAddingExtensions(extensionless, extensions, failedLookupLocations, onlyRecordFailures, state);
         }
     }
+    /** Try to return an existing file that adds one of the `extensions` to `candidate`. */
     function tryAddingExtensions(candidate, extensions, failedLookupLocations, onlyRecordFailures, state) {
         if (!onlyRecordFailures) {
-            var directory_1 = ts.getDirectoryPath(candidate);
-            if (directory_1) {
-                onlyRecordFailures = !directoryProbablyExists(directory_1, state.host);
+            // check if containing folder exists - if it doesn't then just record failures for all supported extensions without disk probing
+            var directory = ts.getDirectoryPath(candidate);
+            if (directory) {
+                onlyRecordFailures = !directoryProbablyExists(directory, state.host);
             }
         }
         switch (extensions) {
             case Extensions.DtsOnly:
-                return tryExtension(".d.ts");
+                return tryExtension(".d.ts" /* Dts */);
             case Extensions.TypeScript:
-                return tryExtension(".ts") || tryExtension(".tsx") || tryExtension(".d.ts");
+                return tryExtension(".ts" /* Ts */) || tryExtension(".tsx" /* Tsx */) || tryExtension(".d.ts" /* Dts */);
             case Extensions.JavaScript:
-                return tryExtension(".js") || tryExtension(".jsx");
+                return tryExtension(".js" /* Js */) || tryExtension(".jsx" /* Jsx */);
             case Extensions.Json:
-                return tryExtension(".json");
+                return tryExtension(".json" /* Json */);
         }
         function tryExtension(ext) {
             var path = tryFile(candidate + ext, failedLookupLocations, onlyRecordFailures, state);
             return path === undefined ? undefined : { path: path, ext: ext };
         }
     }
+    /** Return the file if it exists. */
     function tryFile(fileName, failedLookupLocations, onlyRecordFailures, state) {
         if (!onlyRecordFailures) {
             if (state.host.fileExists(fileName)) {
@@ -21182,25 +25047,25 @@ var ts;
         var packageJsonPath = pathToPackageJson(nodeModuleDirectory);
         if (directoryExists && host.fileExists(packageJsonPath)) {
             var packageJsonContent = readJson(packageJsonPath, host);
-            if (subModuleName === "") {
-                var path = tryReadPackageJsonFields(true, packageJsonContent, nodeModuleDirectory, state);
+            if (subModuleName === "") { // looking up the root - need to handle types/typings/main redirects for subModuleName
+                var path = tryReadPackageJsonFields(/*readTypes*/ true, packageJsonContent, nodeModuleDirectory, state);
                 if (typeof path === "string") {
                     subModuleName = addExtensionAndIndex(path.substring(nodeModuleDirectory.length + 1));
                 }
                 else {
-                    var jsPath = tryReadPackageJsonFields(false, packageJsonContent, nodeModuleDirectory, state);
+                    var jsPath = tryReadPackageJsonFields(/*readTypes*/ false, packageJsonContent, nodeModuleDirectory, state);
                     if (typeof jsPath === "string" && jsPath.length > nodeModuleDirectory.length) {
                         var potentialSubModule_1 = jsPath.substring(nodeModuleDirectory.length + 1);
                         subModuleName = (ts.forEach(ts.supportedJavascriptExtensions, function (extension) {
                             return ts.tryRemoveExtension(potentialSubModule_1, extension);
-                        }) || potentialSubModule_1) + ".d.ts";
+                        }) || potentialSubModule_1) + ".d.ts" /* Dts */;
                     }
                     else {
                         subModuleName = "index.d.ts";
                     }
                 }
             }
-            if (!ts.endsWith(subModuleName, ".d.ts")) {
+            if (!ts.endsWith(subModuleName, ".d.ts" /* Dts */)) {
                 subModuleName = addExtensionAndIndex(subModuleName);
             }
             var packageId = typeof packageJsonContent.name === "string" && typeof packageJsonContent.version === "string"
@@ -21220,6 +25085,7 @@ var ts;
             if (directoryExists && traceEnabled) {
                 trace(host, ts.Diagnostics.File_0_does_not_exist, packageJsonPath);
             }
+            // record package json as one of failed lookup locations - in the future if this file will appear it will invalidate resolution results
             failedLookupLocations.push(packageJsonPath);
             return { found: false, packageJsonContent: undefined, packageId: undefined };
         }
@@ -21228,7 +25094,8 @@ var ts;
         var file = tryReadPackageJsonFields(extensions !== Extensions.JavaScript && extensions !== Extensions.Json, jsonContent, candidate, state);
         if (!file) {
             if (extensions === Extensions.TypeScript) {
-                file = tryReadPackageJsonFields(false, jsonContent, candidate, state);
+                // When resolving typescript modules, try resolving using main field as well
+                file = tryReadPackageJsonFields(/*readTypes*/ false, jsonContent, candidate, state);
                 if (!file) {
                     return undefined;
                 }
@@ -21248,27 +25115,32 @@ var ts;
                 trace(state.host, ts.Diagnostics.File_0_has_an_unsupported_extension_so_skipping_it, fromFile);
             }
         }
+        // Even if extensions is DtsOnly, we can still look up a .ts file as a result of package.json "types"
         var nextExtensions = extensions === Extensions.DtsOnly ? Extensions.TypeScript : extensions;
-        var result = nodeLoadModuleByRelativeName(nextExtensions, file, failedLookupLocations, onlyRecordFailures, state, false);
+        // Don't do package.json lookup recursively, because Node.js' package lookup doesn't.
+        var result = nodeLoadModuleByRelativeName(nextExtensions, file, failedLookupLocations, onlyRecordFailures, state, /*considerPackageJson*/ false);
         if (result) {
+            // It won't have a `packageId` set, because we disabled `considerPackageJson`.
             ts.Debug.assert(result.packageId === undefined);
             return { path: result.path, ext: result.extension };
         }
     }
+    /** Resolve from an arbitrarily specified file. Return `undefined` if it has an unsupported extension. */
     function resolvedIfExtensionMatches(extensions, path) {
         var ext = ts.tryGetExtensionFromPath(path);
         return ext !== undefined && extensionIsOk(extensions, ext) ? { path: path, ext: ext } : undefined;
     }
+    /** True if `extension` is one of the supported `extensions`. */
     function extensionIsOk(extensions, extension) {
         switch (extensions) {
             case Extensions.JavaScript:
-                return extension === ".js" || extension === ".jsx";
+                return extension === ".js" /* Js */ || extension === ".jsx" /* Jsx */;
             case Extensions.Json:
-                return extension === ".json";
+                return extension === ".json" /* Json */;
             case Extensions.TypeScript:
-                return extension === ".ts" || extension === ".tsx" || extension === ".d.ts";
+                return extension === ".ts" /* Ts */ || extension === ".tsx" /* Tsx */ || extension === ".d.ts" /* Dts */;
             case Extensions.DtsOnly:
-                return extension === ".d.ts";
+                return extension === ".d.ts" /* Dts */;
         }
     }
     function pathToPackageJson(directory) {
@@ -21276,16 +25148,18 @@ var ts;
     }
     function loadModuleFromNodeModulesFolder(extensions, moduleName, nodeModulesFolder, nodeModulesFolderExists, failedLookupLocations, state) {
         var candidate = ts.normalizePath(ts.combinePaths(nodeModulesFolder, moduleName));
+        // First look for a nested package.json, as in `node_modules/foo/bar/package.json`.
         var packageJsonContent;
         var packageId;
-        var packageInfo = getPackageJsonInfo(candidate, "", failedLookupLocations, !nodeModulesFolderExists, state);
+        var packageInfo = getPackageJsonInfo(candidate, "", failedLookupLocations, /*onlyRecordFailures*/ !nodeModulesFolderExists, state);
         if (packageInfo.found) {
             (packageJsonContent = packageInfo.packageJsonContent, packageId = packageInfo.packageId);
         }
         else {
             var _a = getPackageName(moduleName), packageName = _a.packageName, rest = _a.rest;
-            if (rest !== "") {
+            if (rest !== "") { // If "rest" is empty, we just did this search above.
                 var packageRootPath = ts.combinePaths(nodeModulesFolder, packageName);
+                // Don't use a "types" or "main" from here because we're not loading the root, but a subdirectory -- just here for the packageId.
                 packageId = getPackageJsonInfo(packageRootPath, rest, failedLookupLocations, !nodeModulesFolderExists, state).packageId;
             }
         }
@@ -21293,6 +25167,7 @@ var ts;
             loadNodeModuleFromDirectoryWorker(extensions, candidate, failedLookupLocations, !nodeModulesFolderExists, state, packageJsonContent);
         return withPackageId(packageId, pathAndExtension);
     }
+    /* @internal */
     function getPackageName(moduleName) {
         var idx = moduleName.indexOf(ts.directorySeparator);
         if (moduleName[0] === "@") {
@@ -21302,10 +25177,11 @@ var ts;
     }
     ts.getPackageName = getPackageName;
     function loadModuleFromNodeModules(extensions, moduleName, directory, failedLookupLocations, state, cache) {
-        return loadModuleFromNodeModulesWorker(extensions, moduleName, directory, failedLookupLocations, state, false, cache);
+        return loadModuleFromNodeModulesWorker(extensions, moduleName, directory, failedLookupLocations, state, /*typesOnly*/ false, cache);
     }
     function loadModuleFromNodeModulesAtTypes(moduleName, directory, failedLookupLocations, state) {
-        return loadModuleFromNodeModulesWorker(Extensions.DtsOnly, moduleName, directory, failedLookupLocations, state, true, undefined);
+        // Extensions parameter here doesn't actually matter, because typesOnly ensures we're just doing @types lookup, which is always DtsOnly.
+        return loadModuleFromNodeModulesWorker(Extensions.DtsOnly, moduleName, directory, failedLookupLocations, state, /*typesOnly*/ true, /*cache*/ undefined);
     }
     function loadModuleFromNodeModulesWorker(extensions, moduleName, directory, failedLookupLocations, state, typesOnly, cache) {
         var perModuleNameCache = cache && cache.getOrCreateCacheForModuleName(moduleName);
@@ -21319,6 +25195,7 @@ var ts;
             }
         });
     }
+    /** Load a module from a single node_modules directory, but not from any ancestors' node_modules directories. */
     function loadModuleFromNodeModulesOneLevel(extensions, moduleName, directory, failedLookupLocations, state, typesOnly) {
         if (typesOnly === void 0) { typesOnly = false; }
         var nodeModulesFolder = ts.combinePaths(directory, "node_modules");
@@ -21342,7 +25219,9 @@ var ts;
             return loadModuleFromNodeModulesFolder(Extensions.DtsOnly, mangleScopedPackage(moduleName, state), nodeModulesAtTypes_1, nodeModulesAtTypesExists, failedLookupLocations, state);
         }
     }
+    /** Double underscores are used in DefinitelyTyped to delimit scoped packages. */
     var mangledScopedPackageSeparator = "__";
+    /** For a scoped package, we must look in `@types/foo__bar` instead of `@types/@foo/bar`. */
     function mangleScopedPackage(packageName, state) {
         var mangled = getMangledNameForScopedPackage(packageName);
         if (state.traceEnabled && mangled !== packageName) {
@@ -21350,20 +25229,23 @@ var ts;
         }
         return mangled;
     }
+    /* @internal */
     function getTypesPackageName(packageName) {
         return "@types/" + getMangledNameForScopedPackage(packageName);
     }
     ts.getTypesPackageName = getTypesPackageName;
+    /* @internal */
     function getMangledNameForScopedPackage(packageName) {
         if (ts.startsWith(packageName, "@")) {
             var replaceSlash = packageName.replace(ts.directorySeparator, mangledScopedPackageSeparator);
             if (replaceSlash !== packageName) {
-                return replaceSlash.slice(1);
+                return replaceSlash.slice(1); // Take off the "@"
             }
         }
         return packageName;
     }
     ts.getMangledNameForScopedPackage = getMangledNameForScopedPackage;
+    /* @internal */
     function getPackageNameFromAtTypesDirectory(mangledName) {
         var withoutAtTypePrefix = ts.removePrefix(mangledName, "@types/");
         if (withoutAtTypePrefix !== mangledName) {
@@ -21372,6 +25254,7 @@ var ts;
         return mangledName;
     }
     ts.getPackageNameFromAtTypesDirectory = getPackageNameFromAtTypesDirectory;
+    /* @internal */
     function getUnmangledNameForScopedPackage(typesPackageName) {
         return ts.stringContains(typesPackageName, mangledScopedPackageSeparator) ?
             "@" + typesPackageName.replace(mangledScopedPackageSeparator, ts.directorySeparator) :
@@ -21394,7 +25277,8 @@ var ts;
         var failedLookupLocations = [];
         var containingDirectory = ts.getDirectoryPath(containingFile);
         var resolved = tryResolve(Extensions.TypeScript) || tryResolve(Extensions.JavaScript);
-        return createResolvedModuleWithFailedLookupLocations(resolved && resolved.value, undefined, false, failedLookupLocations);
+        // No originalPath because classic resolution doesn't resolve realPath
+        return createResolvedModuleWithFailedLookupLocations(resolved && resolved.value, /*originalPath*/ undefined, /*isExternalLibraryImport*/ false, failedLookupLocations);
         function tryResolve(extensions) {
             var resolvedUsingSettings = tryLoadModuleUsingOptionalResolutionSettings(extensions, moduleName, containingDirectory, loadModuleFromFileNoPackageId, failedLookupLocations, state);
             if (resolvedUsingSettings) {
@@ -21402,28 +25286,35 @@ var ts;
             }
             var perModuleNameCache = cache && cache.getOrCreateCacheForModuleName(moduleName);
             if (!ts.isExternalModuleNameRelative(moduleName)) {
+                // Climb up parent directories looking for a module.
                 var resolved_3 = ts.forEachAncestorDirectory(containingDirectory, function (directory) {
                     var resolutionFromCache = tryFindNonRelativeModuleNameInCache(perModuleNameCache, moduleName, directory, traceEnabled, host, failedLookupLocations);
                     if (resolutionFromCache) {
                         return resolutionFromCache;
                     }
                     var searchName = ts.normalizePath(ts.combinePaths(directory, moduleName));
-                    return toSearchResult(loadModuleFromFileNoPackageId(extensions, searchName, failedLookupLocations, false, state));
+                    return toSearchResult(loadModuleFromFileNoPackageId(extensions, searchName, failedLookupLocations, /*onlyRecordFailures*/ false, state));
                 });
                 if (resolved_3) {
                     return resolved_3;
                 }
                 if (extensions === Extensions.TypeScript) {
+                    // If we didn't find the file normally, look it up in @types.
                     return loadModuleFromNodeModulesAtTypes(moduleName, containingDirectory, failedLookupLocations, state);
                 }
             }
             else {
                 var candidate = ts.normalizePath(ts.combinePaths(containingDirectory, moduleName));
-                return toSearchResult(loadModuleFromFileNoPackageId(extensions, candidate, failedLookupLocations, false, state));
+                return toSearchResult(loadModuleFromFileNoPackageId(extensions, candidate, failedLookupLocations, /*onlyRecordFailures*/ false, state));
             }
         }
     }
     ts.classicNameResolver = classicNameResolver;
+    /**
+     * LSHost may load a module from a global cache of typings.
+     * This is the minumum code needed to expose that functionality; the rest is in LSHost.
+     */
+    /* @internal */
     function loadModuleFromGlobalCache(moduleName, projectName, compilerOptions, host, globalCache) {
         var traceEnabled = isTraceEnabled(compilerOptions, host);
         if (traceEnabled) {
@@ -21432,13 +25323,3618 @@ var ts;
         var state = { compilerOptions: compilerOptions, host: host, traceEnabled: traceEnabled };
         var failedLookupLocations = [];
         var resolved = loadModuleFromNodeModulesOneLevel(Extensions.DtsOnly, moduleName, globalCache, failedLookupLocations, state);
-        return createResolvedModuleWithFailedLookupLocations(resolved, undefined, true, failedLookupLocations);
+        return createResolvedModuleWithFailedLookupLocations(resolved, /*originalPath*/ undefined, /*isExternalLibraryImport*/ true, failedLookupLocations);
     }
     ts.loadModuleFromGlobalCache = loadModuleFromGlobalCache;
+    /**
+     * Wraps value to SearchResult.
+     * @returns undefined if value is undefined or { value } otherwise
+     */
     function toSearchResult(value) {
         return value !== undefined ? { value: value } : undefined;
     }
 })(ts || (ts = {}));
+//# sourceMappingURL=parser.js.map
+"use strict";
+var __assign = (this && this.__assign) || Object.assign || function(t) {
+    for (var s, i = 1, n = arguments.length; i < n; i++) {
+        s = arguments[i];
+        for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
+            t[p] = s[p];
+    }
+    return t;
+};
+var __makeTemplateObject = (this && this.__makeTemplateObject) || function (cooked, raw) {
+    if (Object.defineProperty) { Object.defineProperty(cooked, "raw", { value: raw }); } else { cooked.raw = raw; }
+    return cooked;
+};
+/* @internal */
+var ts;
+(function (ts) {
+    var ModuleInstanceState;
+    (function (ModuleInstanceState) {
+        ModuleInstanceState[ModuleInstanceState["NonInstantiated"] = 0] = "NonInstantiated";
+        ModuleInstanceState[ModuleInstanceState["Instantiated"] = 1] = "Instantiated";
+        ModuleInstanceState[ModuleInstanceState["ConstEnumOnly"] = 2] = "ConstEnumOnly";
+    })(ModuleInstanceState = ts.ModuleInstanceState || (ts.ModuleInstanceState = {}));
+    function getModuleInstanceState(node) {
+        return node.body ? getModuleInstanceStateWorker(node.body) : 1 /* Instantiated */;
+    }
+    ts.getModuleInstanceState = getModuleInstanceState;
+    function getModuleInstanceStateWorker(node) {
+        // A module is uninstantiated if it contains only
+        switch (node.kind) {
+            // 1. interface declarations, type alias declarations
+            case 236 /* InterfaceDeclaration */:
+            case 237 /* TypeAliasDeclaration */:
+                return 0 /* NonInstantiated */;
+            // 2. const enum declarations
+            case 238 /* EnumDeclaration */:
+                if (ts.isConst(node)) {
+                    return 2 /* ConstEnumOnly */;
+                }
+                break;
+            // 3. non-exported import declarations
+            case 244 /* ImportDeclaration */:
+            case 243 /* ImportEqualsDeclaration */:
+                if (!(ts.hasModifier(node, 1 /* Export */))) {
+                    return 0 /* NonInstantiated */;
+                }
+                break;
+            // 4. other uninstantiated module declarations.
+            case 240 /* ModuleBlock */: {
+                var state_1 = 0 /* NonInstantiated */;
+                ts.forEachChild(node, function (n) {
+                    var childState = getModuleInstanceStateWorker(n);
+                    switch (childState) {
+                        case 0 /* NonInstantiated */:
+                            // child is non-instantiated - continue searching
+                            return;
+                        case 2 /* ConstEnumOnly */:
+                            // child is const enum only - record state and continue searching
+                            state_1 = 2 /* ConstEnumOnly */;
+                            return;
+                        case 1 /* Instantiated */:
+                            // child is instantiated - record state and stop
+                            state_1 = 1 /* Instantiated */;
+                            return true;
+                        default:
+                            ts.Debug.assertNever(childState);
+                    }
+                });
+                return state_1;
+            }
+            case 239 /* ModuleDeclaration */:
+                return getModuleInstanceState(node);
+            case 71 /* Identifier */:
+                // Only jsdoc typedef definition can exist in jsdoc namespace, and it should
+                // be considered the same as type alias
+                if (node.isInJSDocNamespace) {
+                    return 0 /* NonInstantiated */;
+                }
+        }
+        return 1 /* Instantiated */;
+    }
+    var ContainerFlags;
+    (function (ContainerFlags) {
+        // The current node is not a container, and no container manipulation should happen before
+        // recursing into it.
+        ContainerFlags[ContainerFlags["None"] = 0] = "None";
+        // The current node is a container.  It should be set as the current container (and block-
+        // container) before recursing into it.  The current node does not have locals.  Examples:
+        //
+        //      Classes, ObjectLiterals, TypeLiterals, Interfaces...
+        ContainerFlags[ContainerFlags["IsContainer"] = 1] = "IsContainer";
+        // The current node is a block-scoped-container.  It should be set as the current block-
+        // container before recursing into it.  Examples:
+        //
+        //      Blocks (when not parented by functions), Catch clauses, For/For-in/For-of statements...
+        ContainerFlags[ContainerFlags["IsBlockScopedContainer"] = 2] = "IsBlockScopedContainer";
+        // The current node is the container of a control flow path. The current control flow should
+        // be saved and restored, and a new control flow initialized within the container.
+        ContainerFlags[ContainerFlags["IsControlFlowContainer"] = 4] = "IsControlFlowContainer";
+        ContainerFlags[ContainerFlags["IsFunctionLike"] = 8] = "IsFunctionLike";
+        ContainerFlags[ContainerFlags["IsFunctionExpression"] = 16] = "IsFunctionExpression";
+        ContainerFlags[ContainerFlags["HasLocals"] = 32] = "HasLocals";
+        ContainerFlags[ContainerFlags["IsInterface"] = 64] = "IsInterface";
+        ContainerFlags[ContainerFlags["IsObjectLiteralOrClassExpressionMethod"] = 128] = "IsObjectLiteralOrClassExpressionMethod";
+    })(ContainerFlags || (ContainerFlags = {}));
+    var binder = createBinder();
+    function bindSourceFile(file, options) {
+        ts.performance.mark("beforeBind");
+        binder(file, options);
+        ts.performance.mark("afterBind");
+        ts.performance.measure("Bind", "beforeBind", "afterBind");
+    }
+    ts.bindSourceFile = bindSourceFile;
+    function createBinder() {
+        var file;
+        var options;
+        var languageVersion;
+        var parent;
+        var container;
+        var thisParentContainer; // Container one level up
+        var blockScopeContainer;
+        var lastContainer;
+        var delayedTypeAliases;
+        var seenThisKeyword;
+        // state used by control flow analysis
+        var currentFlow;
+        var currentBreakTarget;
+        var currentContinueTarget;
+        var currentReturnTarget;
+        var currentTrueTarget;
+        var currentFalseTarget;
+        var preSwitchCaseFlow;
+        var activeLabels;
+        var hasExplicitReturn;
+        // state used for emit helpers
+        var emitFlags;
+        // If this file is an external module, then it is automatically in strict-mode according to
+        // ES6.  If it is not an external module, then we'll determine if it is in strict mode or
+        // not depending on if we see "use strict" in certain places or if we hit a class/namespace
+        // or if compiler options contain alwaysStrict.
+        var inStrictMode;
+        var symbolCount = 0;
+        var Symbol; // tslint:disable-line variable-name
+        var classifiableNames;
+        var unreachableFlow = { flags: 1 /* Unreachable */ };
+        var reportedUnreachableFlow = { flags: 1 /* Unreachable */ };
+        // state used to aggregate transform flags during bind.
+        var subtreeTransformFlags = 0 /* None */;
+        var skipTransformFlagAggregation;
+        /**
+         * Inside the binder, we may create a diagnostic for an as-yet unbound node (with potentially no parent pointers, implying no accessible source file)
+         * If so, the node _must_ be in the current file (as that's the only way anything could have traversed to it to yield it as the error node)
+         * This version of `createDiagnosticForNode` uses the binder's context to account for this, and always yields correct diagnostics even in these situations.
+         */
+        function createDiagnosticForNode(node, message, arg0, arg1, arg2) {
+            return ts.createDiagnosticForNodeInSourceFile(ts.getSourceFileOfNode(node) || file, node, message, arg0, arg1, arg2);
+        }
+        function bindSourceFile(f, opts) {
+            file = f;
+            options = opts;
+            languageVersion = ts.getEmitScriptTarget(options);
+            inStrictMode = bindInStrictMode(file, opts);
+            classifiableNames = ts.createUnderscoreEscapedMap();
+            symbolCount = 0;
+            skipTransformFlagAggregation = file.isDeclarationFile;
+            Symbol = ts.objectAllocator.getSymbolConstructor();
+            if (!file.locals) {
+                bind(file);
+                file.symbolCount = symbolCount;
+                file.classifiableNames = classifiableNames;
+                delayedBindJSDocTypedefTag();
+            }
+            file = undefined;
+            options = undefined;
+            languageVersion = undefined;
+            parent = undefined;
+            container = undefined;
+            thisParentContainer = undefined;
+            blockScopeContainer = undefined;
+            lastContainer = undefined;
+            delayedTypeAliases = undefined;
+            seenThisKeyword = false;
+            currentFlow = undefined;
+            currentBreakTarget = undefined;
+            currentContinueTarget = undefined;
+            currentReturnTarget = undefined;
+            currentTrueTarget = undefined;
+            currentFalseTarget = undefined;
+            activeLabels = undefined;
+            hasExplicitReturn = false;
+            emitFlags = 0 /* None */;
+            subtreeTransformFlags = 0 /* None */;
+        }
+        return bindSourceFile;
+        function bindInStrictMode(file, opts) {
+            if (ts.getStrictOptionValue(opts, "alwaysStrict") && !file.isDeclarationFile) {
+                // bind in strict mode source files with alwaysStrict option
+                return true;
+            }
+            else {
+                return !!file.externalModuleIndicator;
+            }
+        }
+        function createSymbol(flags, name) {
+            symbolCount++;
+            return new Symbol(flags, name);
+        }
+        function addDeclarationToSymbol(symbol, node, symbolFlags) {
+            symbol.flags |= symbolFlags;
+            node.symbol = symbol;
+            symbol.declarations = ts.append(symbol.declarations, node);
+            if (symbolFlags & 1952 /* HasExports */ && !symbol.exports) {
+                symbol.exports = ts.createSymbolTable();
+            }
+            if (symbolFlags & 6240 /* HasMembers */ && !symbol.members) {
+                symbol.members = ts.createSymbolTable();
+            }
+            if (symbolFlags & 67216319 /* Value */) {
+                var valueDeclaration = symbol.valueDeclaration;
+                if (!valueDeclaration ||
+                    (valueDeclaration.kind !== node.kind && ts.isEffectiveModuleDeclaration(valueDeclaration))) {
+                    // other kinds of value declarations take precedence over modules
+                    symbol.valueDeclaration = node;
+                }
+            }
+        }
+        // Should not be called on a declaration with a computed property name,
+        // unless it is a well known Symbol.
+        function getDeclarationName(node) {
+            if (node.kind === 249 /* ExportAssignment */) {
+                return node.isExportEquals ? "export=" /* ExportEquals */ : "default" /* Default */;
+            }
+            var name = ts.getNameOfDeclaration(node);
+            if (name) {
+                if (ts.isAmbientModule(node)) {
+                    var moduleName = ts.getTextOfIdentifierOrLiteral(name);
+                    return (ts.isGlobalScopeAugmentation(node) ? "__global" : "\"" + moduleName + "\"");
+                }
+                if (name.kind === 147 /* ComputedPropertyName */) {
+                    var nameExpression = name.expression;
+                    // treat computed property names where expression is string/numeric literal as just string/numeric literal
+                    if (ts.isStringOrNumericLiteral(nameExpression)) {
+                        return ts.escapeLeadingUnderscores(nameExpression.text);
+                    }
+                    ts.Debug.assert(ts.isWellKnownSymbolSyntactically(nameExpression));
+                    return ts.getPropertyNameForKnownSymbolName(ts.idText(nameExpression.name));
+                }
+                return ts.isPropertyNameLiteral(name) ? ts.getEscapedTextOfIdentifierOrLiteral(name) : undefined;
+            }
+            switch (node.kind) {
+                case 155 /* Constructor */:
+                    return "__constructor" /* Constructor */;
+                case 163 /* FunctionType */:
+                case 158 /* CallSignature */:
+                case 288 /* JSDocSignature */:
+                    return "__call" /* Call */;
+                case 164 /* ConstructorType */:
+                case 159 /* ConstructSignature */:
+                    return "__new" /* New */;
+                case 160 /* IndexSignature */:
+                    return "__index" /* Index */;
+                case 250 /* ExportDeclaration */:
+                    return "__export" /* ExportStar */;
+                case 274 /* SourceFile */:
+                    // json file should behave as
+                    // module.exports = ...
+                    return "export=" /* ExportEquals */;
+                case 200 /* BinaryExpression */:
+                    if (ts.getSpecialPropertyAssignmentKind(node) === 2 /* ModuleExports */) {
+                        // module.exports = ...
+                        return "export=" /* ExportEquals */;
+                    }
+                    ts.Debug.fail("Unknown binary declaration kind");
+                    break;
+                case 284 /* JSDocFunctionType */:
+                    return (ts.isJSDocConstructSignature(node) ? "__new" /* New */ : "__call" /* Call */);
+                case 149 /* Parameter */:
+                    // Parameters with names are handled at the top of this function.  Parameters
+                    // without names can only come from JSDocFunctionTypes.
+                    ts.Debug.assert(node.parent.kind === 284 /* JSDocFunctionType */, "Impossible parameter parent kind", function () { return "parent is: " + (ts.SyntaxKind ? ts.SyntaxKind[node.parent.kind] : node.parent.kind) + ", expected JSDocFunctionType"; });
+                    var functionType = node.parent;
+                    var index = functionType.parameters.indexOf(node);
+                    return "arg" + index;
+            }
+        }
+        function getDisplayName(node) {
+            return ts.isNamedDeclaration(node) ? ts.declarationNameToString(node.name) : ts.unescapeLeadingUnderscores(getDeclarationName(node)); // TODO: GH#18217
+        }
+        /**
+         * Declares a Symbol for the node and adds it to symbols. Reports errors for conflicting identifier names.
+         * @param symbolTable - The symbol table which node will be added to.
+         * @param parent - node's parent declaration.
+         * @param node - The declaration to be added to the symbol table
+         * @param includes - The SymbolFlags that node has in addition to its declaration type (eg: export, ambient, etc.)
+         * @param excludes - The flags which node cannot be declared alongside in a symbol table. Used to report forbidden declarations.
+         */
+        function declareSymbol(symbolTable, parent, node, includes, excludes, isReplaceableByMethod) {
+            ts.Debug.assert(!ts.hasDynamicName(node));
+            var isDefaultExport = ts.hasModifier(node, 512 /* Default */);
+            // The exported symbol for an export default function/class node is always named "default"
+            var name = isDefaultExport && parent ? "default" /* Default */ : getDeclarationName(node);
+            var symbol;
+            if (name === undefined) {
+                symbol = createSymbol(0 /* None */, "__missing" /* Missing */);
+            }
+            else {
+                // Check and see if the symbol table already has a symbol with this name.  If not,
+                // create a new symbol with this name and add it to the table.  Note that we don't
+                // give the new symbol any flags *yet*.  This ensures that it will not conflict
+                // with the 'excludes' flags we pass in.
+                //
+                // If we do get an existing symbol, see if it conflicts with the new symbol we're
+                // creating.  For example, a 'var' symbol and a 'class' symbol will conflict within
+                // the same symbol table.  If we have a conflict, report the issue on each
+                // declaration we have for this symbol, and then create a new symbol for this
+                // declaration.
+                //
+                // Note that when properties declared in Javascript constructors
+                // (marked by isReplaceableByMethod) conflict with another symbol, the property loses.
+                // Always. This allows the common Javascript pattern of overwriting a prototype method
+                // with an bound instance method of the same type: `this.method = this.method.bind(this)`
+                //
+                // If we created a new symbol, either because we didn't have a symbol with this name
+                // in the symbol table, or we conflicted with an existing symbol, then just add this
+                // node as the sole declaration of the new symbol.
+                //
+                // Otherwise, we'll be merging into a compatible existing symbol (for example when
+                // you have multiple 'vars' with the same name in the same container).  In this case
+                // just add this node into the declarations list of the symbol.
+                symbol = symbolTable.get(name);
+                if (includes & 2885600 /* Classifiable */) {
+                    classifiableNames.set(name, true);
+                }
+                if (!symbol) {
+                    symbolTable.set(name, symbol = createSymbol(0 /* None */, name));
+                    if (isReplaceableByMethod)
+                        symbol.isReplaceableByMethod = true;
+                }
+                else if (isReplaceableByMethod && !symbol.isReplaceableByMethod) {
+                    // A symbol already exists, so don't add this as a declaration.
+                    return symbol;
+                }
+                else if (symbol.flags & excludes) {
+                    if (symbol.isReplaceableByMethod) {
+                        // Javascript constructor-declared symbols can be discarded in favor of
+                        // prototype symbols like methods.
+                        symbolTable.set(name, symbol = createSymbol(0 /* None */, name));
+                    }
+                    else {
+                        if (ts.isNamedDeclaration(node)) {
+                            node.name.parent = node;
+                        }
+                        // Report errors every position with duplicate declaration
+                        // Report errors on previous encountered declarations
+                        var message_1 = symbol.flags & 2 /* BlockScopedVariable */
+                            ? ts.Diagnostics.Cannot_redeclare_block_scoped_variable_0
+                            : ts.Diagnostics.Duplicate_identifier_0;
+                        if (symbol.flags & 384 /* Enum */ || includes & 384 /* Enum */) {
+                            message_1 = ts.Diagnostics.Enum_declarations_can_only_merge_with_namespace_or_other_enum_declarations;
+                        }
+                        if (symbol.declarations && symbol.declarations.length) {
+                            // If the current node is a default export of some sort, then check if
+                            // there are any other default exports that we need to error on.
+                            // We'll know whether we have other default exports depending on if `symbol` already has a declaration list set.
+                            if (isDefaultExport) {
+                                message_1 = ts.Diagnostics.A_module_cannot_have_multiple_default_exports;
+                            }
+                            else {
+                                // This is to properly report an error in the case "export default { }" is after export default of class declaration or function declaration.
+                                // Error on multiple export default in the following case:
+                                // 1. multiple export default of class declaration or function declaration by checking NodeFlags.Default
+                                // 2. multiple export default of export assignment. This one doesn't have NodeFlags.Default on (as export default doesn't considered as modifiers)
+                                if (symbol.declarations && symbol.declarations.length &&
+                                    (node.kind === 249 /* ExportAssignment */ && !node.isExportEquals)) {
+                                    message_1 = ts.Diagnostics.A_module_cannot_have_multiple_default_exports;
+                                }
+                            }
+                        }
+                        ts.forEach(symbol.declarations, function (declaration) {
+                            file.bindDiagnostics.push(createDiagnosticForNode(ts.getNameOfDeclaration(declaration) || declaration, message_1, getDisplayName(declaration)));
+                        });
+                        file.bindDiagnostics.push(createDiagnosticForNode(ts.getNameOfDeclaration(node) || node, message_1, getDisplayName(node)));
+                        symbol = createSymbol(0 /* None */, name);
+                    }
+                }
+            }
+            addDeclarationToSymbol(symbol, node, includes);
+            if (symbol.parent) {
+                ts.Debug.assert(symbol.parent === parent, "Existing symbol parent should match new one");
+            }
+            else {
+                symbol.parent = parent;
+            }
+            return symbol;
+        }
+        function declareModuleMember(node, symbolFlags, symbolExcludes) {
+            var hasExportModifier = ts.getCombinedModifierFlags(node) & 1 /* Export */;
+            if (symbolFlags & 2097152 /* Alias */) {
+                if (node.kind === 252 /* ExportSpecifier */ || (node.kind === 243 /* ImportEqualsDeclaration */ && hasExportModifier)) {
+                    return declareSymbol(container.symbol.exports, container.symbol, node, symbolFlags, symbolExcludes);
+                }
+                else {
+                    return declareSymbol(container.locals, /*parent*/ undefined, node, symbolFlags, symbolExcludes);
+                }
+            }
+            else {
+                // Exported module members are given 2 symbols: A local symbol that is classified with an ExportValue flag,
+                // and an associated export symbol with all the correct flags set on it. There are 2 main reasons:
+                //
+                //   1. We treat locals and exports of the same name as mutually exclusive within a container.
+                //      That means the binder will issue a Duplicate Identifier error if you mix locals and exports
+                //      with the same name in the same container.
+                //      TODO: Make this a more specific error and decouple it from the exclusion logic.
+                //   2. When we checkIdentifier in the checker, we set its resolved symbol to the local symbol,
+                //      but return the export symbol (by calling getExportSymbolOfValueSymbolIfExported). That way
+                //      when the emitter comes back to it, it knows not to qualify the name if it was found in a containing scope.
+                // NOTE: Nested ambient modules always should go to to 'locals' table to prevent their automatic merge
+                //       during global merging in the checker. Why? The only case when ambient module is permitted inside another module is module augmentation
+                //       and this case is specially handled. Module augmentations should only be merged with original module definition
+                //       and should never be merged directly with other augmentation, and the latter case would be possible if automatic merge is allowed.
+                if (ts.isJSDocTypeAlias(node))
+                    ts.Debug.assert(ts.isInJavaScriptFile(node)); // We shouldn't add symbols for JSDoc nodes if not in a JS file.
+                if ((!ts.isAmbientModule(node) && (hasExportModifier || container.flags & 32 /* ExportContext */)) || ts.isJSDocTypeAlias(node)) {
+                    if (ts.hasModifier(node, 512 /* Default */) && !getDeclarationName(node)) {
+                        return declareSymbol(container.symbol.exports, container.symbol, node, symbolFlags, symbolExcludes); // No local symbol for an unnamed default!
+                    }
+                    var exportKind = symbolFlags & 67216319 /* Value */ ? 1048576 /* ExportValue */ : 0;
+                    var local = declareSymbol(container.locals, /*parent*/ undefined, node, exportKind, symbolExcludes);
+                    local.exportSymbol = declareSymbol(container.symbol.exports, container.symbol, node, symbolFlags, symbolExcludes);
+                    node.localSymbol = local;
+                    return local;
+                }
+                else {
+                    return declareSymbol(container.locals, /*parent*/ undefined, node, symbolFlags, symbolExcludes);
+                }
+            }
+        }
+        // All container nodes are kept on a linked list in declaration order. This list is used by
+        // the getLocalNameOfContainer function in the type checker to validate that the local name
+        // used for a container is unique.
+        function bindContainer(node, containerFlags) {
+            // Before we recurse into a node's children, we first save the existing parent, container
+            // and block-container.  Then after we pop out of processing the children, we restore
+            // these saved values.
+            var saveContainer = container;
+            var saveThisParentContainer = thisParentContainer;
+            var savedBlockScopeContainer = blockScopeContainer;
+            // Depending on what kind of node this is, we may have to adjust the current container
+            // and block-container.   If the current node is a container, then it is automatically
+            // considered the current block-container as well.  Also, for containers that we know
+            // may contain locals, we eagerly initialize the .locals field. We do this because
+            // it's highly likely that the .locals will be needed to place some child in (for example,
+            // a parameter, or variable declaration).
+            //
+            // However, we do not proactively create the .locals for block-containers because it's
+            // totally normal and common for block-containers to never actually have a block-scoped
+            // variable in them.  We don't want to end up allocating an object for every 'block' we
+            // run into when most of them won't be necessary.
+            //
+            // Finally, if this is a block-container, then we clear out any existing .locals object
+            // it may contain within it.  This happens in incremental scenarios.  Because we can be
+            // reusing a node from a previous compilation, that node may have had 'locals' created
+            // for it.  We must clear this so we don't accidentally move any stale data forward from
+            // a previous compilation.
+            if (containerFlags & 1 /* IsContainer */) {
+                if (node.kind !== 193 /* ArrowFunction */) {
+                    thisParentContainer = container;
+                }
+                container = blockScopeContainer = node;
+                if (containerFlags & 32 /* HasLocals */) {
+                    container.locals = ts.createSymbolTable();
+                }
+                addToContainerChain(container);
+            }
+            else if (containerFlags & 2 /* IsBlockScopedContainer */) {
+                blockScopeContainer = node;
+                blockScopeContainer.locals = undefined;
+            }
+            if (containerFlags & 4 /* IsControlFlowContainer */) {
+                var saveCurrentFlow = currentFlow;
+                var saveBreakTarget = currentBreakTarget;
+                var saveContinueTarget = currentContinueTarget;
+                var saveReturnTarget = currentReturnTarget;
+                var saveActiveLabels = activeLabels;
+                var saveHasExplicitReturn = hasExplicitReturn;
+                var isIIFE = containerFlags & 16 /* IsFunctionExpression */ && !ts.hasModifier(node, 256 /* Async */) &&
+                    !node.asteriskToken && !!ts.getImmediatelyInvokedFunctionExpression(node);
+                // A non-async, non-generator IIFE is considered part of the containing control flow. Return statements behave
+                // similarly to break statements that exit to a label just past the statement body.
+                if (!isIIFE) {
+                    currentFlow = { flags: 2 /* Start */ };
+                    if (containerFlags & (16 /* IsFunctionExpression */ | 128 /* IsObjectLiteralOrClassExpressionMethod */)) {
+                        currentFlow.container = node;
+                    }
+                }
+                // We create a return control flow graph for IIFEs and constructors. For constructors
+                // we use the return control flow graph in strict property intialization checks.
+                currentReturnTarget = isIIFE || node.kind === 155 /* Constructor */ ? createBranchLabel() : undefined;
+                currentBreakTarget = undefined;
+                currentContinueTarget = undefined;
+                activeLabels = undefined;
+                hasExplicitReturn = false;
+                bindChildren(node);
+                // Reset all reachability check related flags on node (for incremental scenarios)
+                node.flags &= ~1408 /* ReachabilityAndEmitFlags */;
+                if (!(currentFlow.flags & 1 /* Unreachable */) && containerFlags & 8 /* IsFunctionLike */ && ts.nodeIsPresent(node.body)) {
+                    node.flags |= 128 /* HasImplicitReturn */;
+                    if (hasExplicitReturn)
+                        node.flags |= 256 /* HasExplicitReturn */;
+                }
+                if (node.kind === 274 /* SourceFile */) {
+                    node.flags |= emitFlags;
+                }
+                if (currentReturnTarget) {
+                    addAntecedent(currentReturnTarget, currentFlow);
+                    currentFlow = finishFlowLabel(currentReturnTarget);
+                    if (node.kind === 155 /* Constructor */) {
+                        node.returnFlowNode = currentFlow;
+                    }
+                }
+                if (!isIIFE) {
+                    currentFlow = saveCurrentFlow;
+                }
+                currentBreakTarget = saveBreakTarget;
+                currentContinueTarget = saveContinueTarget;
+                currentReturnTarget = saveReturnTarget;
+                activeLabels = saveActiveLabels;
+                hasExplicitReturn = saveHasExplicitReturn;
+            }
+            else if (containerFlags & 64 /* IsInterface */) {
+                seenThisKeyword = false;
+                bindChildren(node);
+                node.flags = seenThisKeyword ? node.flags | 64 /* ContainsThis */ : node.flags & ~64 /* ContainsThis */;
+            }
+            else {
+                bindChildren(node);
+            }
+            container = saveContainer;
+            thisParentContainer = saveThisParentContainer;
+            blockScopeContainer = savedBlockScopeContainer;
+        }
+        function bindChildren(node) {
+            if (skipTransformFlagAggregation) {
+                bindChildrenWorker(node);
+            }
+            else if (node.transformFlags & 536870912 /* HasComputedFlags */) {
+                skipTransformFlagAggregation = true;
+                bindChildrenWorker(node);
+                skipTransformFlagAggregation = false;
+                subtreeTransformFlags |= node.transformFlags & ~getTransformFlagsSubtreeExclusions(node.kind);
+            }
+            else {
+                var savedSubtreeTransformFlags = subtreeTransformFlags;
+                subtreeTransformFlags = 0;
+                bindChildrenWorker(node);
+                subtreeTransformFlags = savedSubtreeTransformFlags | computeTransformFlagsForNode(node, subtreeTransformFlags);
+            }
+        }
+        function bindEachFunctionsFirst(nodes) {
+            bindEach(nodes, function (n) { return n.kind === 234 /* FunctionDeclaration */ ? bind(n) : undefined; });
+            bindEach(nodes, function (n) { return n.kind !== 234 /* FunctionDeclaration */ ? bind(n) : undefined; });
+        }
+        function bindEach(nodes, bindFunction) {
+            if (bindFunction === void 0) { bindFunction = bind; }
+            if (nodes === undefined) {
+                return;
+            }
+            if (skipTransformFlagAggregation) {
+                ts.forEach(nodes, bindFunction);
+            }
+            else {
+                var savedSubtreeTransformFlags = subtreeTransformFlags;
+                subtreeTransformFlags = 0 /* None */;
+                var nodeArrayFlags = 0 /* None */;
+                for (var _i = 0, nodes_1 = nodes; _i < nodes_1.length; _i++) {
+                    var node = nodes_1[_i];
+                    bindFunction(node);
+                    nodeArrayFlags |= node.transformFlags & ~536870912 /* HasComputedFlags */;
+                }
+                nodes.transformFlags = nodeArrayFlags | 536870912 /* HasComputedFlags */;
+                subtreeTransformFlags |= savedSubtreeTransformFlags;
+            }
+        }
+        function bindEachChild(node) {
+            ts.forEachChild(node, bind, bindEach);
+        }
+        function bindChildrenWorker(node) {
+            if (checkUnreachable(node)) {
+                bindEachChild(node);
+                return;
+            }
+            switch (node.kind) {
+                case 219 /* WhileStatement */:
+                    bindWhileStatement(node);
+                    break;
+                case 218 /* DoStatement */:
+                    bindDoStatement(node);
+                    break;
+                case 220 /* ForStatement */:
+                    bindForStatement(node);
+                    break;
+                case 221 /* ForInStatement */:
+                case 222 /* ForOfStatement */:
+                    bindForInOrForOfStatement(node);
+                    break;
+                case 217 /* IfStatement */:
+                    bindIfStatement(node);
+                    break;
+                case 225 /* ReturnStatement */:
+                case 229 /* ThrowStatement */:
+                    bindReturnOrThrow(node);
+                    break;
+                case 224 /* BreakStatement */:
+                case 223 /* ContinueStatement */:
+                    bindBreakOrContinueStatement(node);
+                    break;
+                case 230 /* TryStatement */:
+                    bindTryStatement(node);
+                    break;
+                case 227 /* SwitchStatement */:
+                    bindSwitchStatement(node);
+                    break;
+                case 241 /* CaseBlock */:
+                    bindCaseBlock(node);
+                    break;
+                case 266 /* CaseClause */:
+                    bindCaseClause(node);
+                    break;
+                case 228 /* LabeledStatement */:
+                    bindLabeledStatement(node);
+                    break;
+                case 198 /* PrefixUnaryExpression */:
+                    bindPrefixUnaryExpressionFlow(node);
+                    break;
+                case 199 /* PostfixUnaryExpression */:
+                    bindPostfixUnaryExpressionFlow(node);
+                    break;
+                case 200 /* BinaryExpression */:
+                    bindBinaryExpressionFlow(node);
+                    break;
+                case 194 /* DeleteExpression */:
+                    bindDeleteExpressionFlow(node);
+                    break;
+                case 201 /* ConditionalExpression */:
+                    bindConditionalExpressionFlow(node);
+                    break;
+                case 232 /* VariableDeclaration */:
+                    bindVariableDeclarationFlow(node);
+                    break;
+                case 187 /* CallExpression */:
+                    bindCallExpressionFlow(node);
+                    break;
+                case 297 /* JSDocTypedefTag */:
+                case 292 /* JSDocCallbackTag */:
+                    bindJSDocTypeAlias(node);
+                    break;
+                // In source files and blocks, bind functions first to match hoisting that occurs at runtime
+                case 274 /* SourceFile */:
+                    bindEachFunctionsFirst(node.statements);
+                    bind(node.endOfFileToken);
+                    break;
+                case 213 /* Block */:
+                case 240 /* ModuleBlock */:
+                    bindEachFunctionsFirst(node.statements);
+                    break;
+                default:
+                    bindEachChild(node);
+                    break;
+            }
+            bindJSDoc(node);
+        }
+        function isNarrowingExpression(expr) {
+            switch (expr.kind) {
+                case 71 /* Identifier */:
+                case 99 /* ThisKeyword */:
+                case 185 /* PropertyAccessExpression */:
+                    return isNarrowableReference(expr);
+                case 187 /* CallExpression */:
+                    return hasNarrowableArgument(expr);
+                case 191 /* ParenthesizedExpression */:
+                    return isNarrowingExpression(expr.expression);
+                case 200 /* BinaryExpression */:
+                    return isNarrowingBinaryExpression(expr);
+                case 198 /* PrefixUnaryExpression */:
+                    return expr.operator === 51 /* ExclamationToken */ && isNarrowingExpression(expr.operand);
+            }
+            return false;
+        }
+        function isNarrowableReference(expr) {
+            return expr.kind === 71 /* Identifier */ ||
+                expr.kind === 99 /* ThisKeyword */ ||
+                expr.kind === 97 /* SuperKeyword */ ||
+                expr.kind === 185 /* PropertyAccessExpression */ && isNarrowableReference(expr.expression);
+        }
+        function hasNarrowableArgument(expr) {
+            if (expr.arguments) {
+                for (var _i = 0, _a = expr.arguments; _i < _a.length; _i++) {
+                    var argument = _a[_i];
+                    if (isNarrowableReference(argument)) {
+                        return true;
+                    }
+                }
+            }
+            if (expr.expression.kind === 185 /* PropertyAccessExpression */ &&
+                isNarrowableReference(expr.expression.expression)) {
+                return true;
+            }
+            return false;
+        }
+        function isNarrowingTypeofOperands(expr1, expr2) {
+            return ts.isTypeOfExpression(expr1) && isNarrowableOperand(expr1.expression) && ts.isStringLiteralLike(expr2);
+        }
+        function isNarrowableInOperands(left, right) {
+            return ts.isStringLiteralLike(left) && isNarrowingExpression(right);
+        }
+        function isNarrowingBinaryExpression(expr) {
+            switch (expr.operatorToken.kind) {
+                case 58 /* EqualsToken */:
+                    return isNarrowableReference(expr.left);
+                case 32 /* EqualsEqualsToken */:
+                case 33 /* ExclamationEqualsToken */:
+                case 34 /* EqualsEqualsEqualsToken */:
+                case 35 /* ExclamationEqualsEqualsToken */:
+                    return isNarrowableOperand(expr.left) || isNarrowableOperand(expr.right) ||
+                        isNarrowingTypeofOperands(expr.right, expr.left) || isNarrowingTypeofOperands(expr.left, expr.right);
+                case 93 /* InstanceOfKeyword */:
+                    return isNarrowableOperand(expr.left);
+                case 92 /* InKeyword */:
+                    return isNarrowableInOperands(expr.left, expr.right);
+                case 26 /* CommaToken */:
+                    return isNarrowingExpression(expr.right);
+            }
+            return false;
+        }
+        function isNarrowableOperand(expr) {
+            switch (expr.kind) {
+                case 191 /* ParenthesizedExpression */:
+                    return isNarrowableOperand(expr.expression);
+                case 200 /* BinaryExpression */:
+                    switch (expr.operatorToken.kind) {
+                        case 58 /* EqualsToken */:
+                            return isNarrowableOperand(expr.left);
+                        case 26 /* CommaToken */:
+                            return isNarrowableOperand(expr.right);
+                    }
+            }
+            return isNarrowableReference(expr);
+        }
+        function createBranchLabel() {
+            return {
+                flags: 4 /* BranchLabel */,
+                antecedents: undefined
+            };
+        }
+        function createLoopLabel() {
+            return {
+                flags: 8 /* LoopLabel */,
+                antecedents: undefined
+            };
+        }
+        function setFlowNodeReferenced(flow) {
+            // On first reference we set the Referenced flag, thereafter we set the Shared flag
+            flow.flags |= flow.flags & 512 /* Referenced */ ? 1024 /* Shared */ : 512 /* Referenced */;
+        }
+        function addAntecedent(label, antecedent) {
+            if (!(antecedent.flags & 1 /* Unreachable */) && !ts.contains(label.antecedents, antecedent)) {
+                (label.antecedents || (label.antecedents = [])).push(antecedent);
+                setFlowNodeReferenced(antecedent);
+            }
+        }
+        function createFlowCondition(flags, antecedent, expression) {
+            if (antecedent.flags & 1 /* Unreachable */) {
+                return antecedent;
+            }
+            if (!expression) {
+                return flags & 32 /* TrueCondition */ ? antecedent : unreachableFlow;
+            }
+            if (expression.kind === 101 /* TrueKeyword */ && flags & 64 /* FalseCondition */ ||
+                expression.kind === 86 /* FalseKeyword */ && flags & 32 /* TrueCondition */) {
+                return unreachableFlow;
+            }
+            if (!isNarrowingExpression(expression)) {
+                return antecedent;
+            }
+            setFlowNodeReferenced(antecedent);
+            return { flags: flags, expression: expression, antecedent: antecedent };
+        }
+        function createFlowSwitchClause(antecedent, switchStatement, clauseStart, clauseEnd) {
+            if (!isNarrowingExpression(switchStatement.expression)) {
+                return antecedent;
+            }
+            setFlowNodeReferenced(antecedent);
+            return { flags: 128 /* SwitchClause */, switchStatement: switchStatement, clauseStart: clauseStart, clauseEnd: clauseEnd, antecedent: antecedent };
+        }
+        function createFlowAssignment(antecedent, node) {
+            setFlowNodeReferenced(antecedent);
+            return { flags: 16 /* Assignment */, antecedent: antecedent, node: node };
+        }
+        function createFlowArrayMutation(antecedent, node) {
+            setFlowNodeReferenced(antecedent);
+            var res = { flags: 256 /* ArrayMutation */, antecedent: antecedent, node: node };
+            return res;
+        }
+        function finishFlowLabel(flow) {
+            var antecedents = flow.antecedents;
+            if (!antecedents) {
+                return unreachableFlow;
+            }
+            if (antecedents.length === 1) {
+                return antecedents[0];
+            }
+            return flow;
+        }
+        function isStatementCondition(node) {
+            var parent = node.parent;
+            switch (parent.kind) {
+                case 217 /* IfStatement */:
+                case 219 /* WhileStatement */:
+                case 218 /* DoStatement */:
+                    return parent.expression === node;
+                case 220 /* ForStatement */:
+                case 201 /* ConditionalExpression */:
+                    return parent.condition === node;
+            }
+            return false;
+        }
+        function isLogicalExpression(node) {
+            while (true) {
+                if (node.kind === 191 /* ParenthesizedExpression */) {
+                    node = node.expression;
+                }
+                else if (node.kind === 198 /* PrefixUnaryExpression */ && node.operator === 51 /* ExclamationToken */) {
+                    node = node.operand;
+                }
+                else {
+                    return node.kind === 200 /* BinaryExpression */ && (node.operatorToken.kind === 53 /* AmpersandAmpersandToken */ ||
+                        node.operatorToken.kind === 54 /* BarBarToken */);
+                }
+            }
+        }
+        function isTopLevelLogicalExpression(node) {
+            while (node.parent.kind === 191 /* ParenthesizedExpression */ ||
+                node.parent.kind === 198 /* PrefixUnaryExpression */ &&
+                    node.parent.operator === 51 /* ExclamationToken */) {
+                node = node.parent;
+            }
+            return !isStatementCondition(node) && !isLogicalExpression(node.parent);
+        }
+        function bindCondition(node, trueTarget, falseTarget) {
+            var saveTrueTarget = currentTrueTarget;
+            var saveFalseTarget = currentFalseTarget;
+            currentTrueTarget = trueTarget;
+            currentFalseTarget = falseTarget;
+            bind(node);
+            currentTrueTarget = saveTrueTarget;
+            currentFalseTarget = saveFalseTarget;
+            if (!node || !isLogicalExpression(node)) {
+                addAntecedent(trueTarget, createFlowCondition(32 /* TrueCondition */, currentFlow, node));
+                addAntecedent(falseTarget, createFlowCondition(64 /* FalseCondition */, currentFlow, node));
+            }
+        }
+        function bindIterativeStatement(node, breakTarget, continueTarget) {
+            var saveBreakTarget = currentBreakTarget;
+            var saveContinueTarget = currentContinueTarget;
+            currentBreakTarget = breakTarget;
+            currentContinueTarget = continueTarget;
+            bind(node);
+            currentBreakTarget = saveBreakTarget;
+            currentContinueTarget = saveContinueTarget;
+        }
+        function bindWhileStatement(node) {
+            var preWhileLabel = createLoopLabel();
+            var preBodyLabel = createBranchLabel();
+            var postWhileLabel = createBranchLabel();
+            addAntecedent(preWhileLabel, currentFlow);
+            currentFlow = preWhileLabel;
+            bindCondition(node.expression, preBodyLabel, postWhileLabel);
+            currentFlow = finishFlowLabel(preBodyLabel);
+            bindIterativeStatement(node.statement, postWhileLabel, preWhileLabel);
+            addAntecedent(preWhileLabel, currentFlow);
+            currentFlow = finishFlowLabel(postWhileLabel);
+        }
+        function bindDoStatement(node) {
+            var preDoLabel = createLoopLabel();
+            var enclosingLabeledStatement = node.parent.kind === 228 /* LabeledStatement */
+                ? ts.lastOrUndefined(activeLabels)
+                : undefined;
+            // if do statement is wrapped in labeled statement then target labels for break/continue with or without
+            // label should be the same
+            var preConditionLabel = enclosingLabeledStatement ? enclosingLabeledStatement.continueTarget : createBranchLabel();
+            var postDoLabel = enclosingLabeledStatement ? enclosingLabeledStatement.breakTarget : createBranchLabel();
+            addAntecedent(preDoLabel, currentFlow);
+            currentFlow = preDoLabel;
+            bindIterativeStatement(node.statement, postDoLabel, preConditionLabel);
+            addAntecedent(preConditionLabel, currentFlow);
+            currentFlow = finishFlowLabel(preConditionLabel);
+            bindCondition(node.expression, preDoLabel, postDoLabel);
+            currentFlow = finishFlowLabel(postDoLabel);
+        }
+        function bindForStatement(node) {
+            var preLoopLabel = createLoopLabel();
+            var preBodyLabel = createBranchLabel();
+            var postLoopLabel = createBranchLabel();
+            bind(node.initializer);
+            addAntecedent(preLoopLabel, currentFlow);
+            currentFlow = preLoopLabel;
+            bindCondition(node.condition, preBodyLabel, postLoopLabel);
+            currentFlow = finishFlowLabel(preBodyLabel);
+            bindIterativeStatement(node.statement, postLoopLabel, preLoopLabel);
+            bind(node.incrementor);
+            addAntecedent(preLoopLabel, currentFlow);
+            currentFlow = finishFlowLabel(postLoopLabel);
+        }
+        function bindForInOrForOfStatement(node) {
+            var preLoopLabel = createLoopLabel();
+            var postLoopLabel = createBranchLabel();
+            addAntecedent(preLoopLabel, currentFlow);
+            currentFlow = preLoopLabel;
+            if (node.kind === 222 /* ForOfStatement */) {
+                bind(node.awaitModifier);
+            }
+            bind(node.expression);
+            addAntecedent(postLoopLabel, currentFlow);
+            bind(node.initializer);
+            if (node.initializer.kind !== 233 /* VariableDeclarationList */) {
+                bindAssignmentTargetFlow(node.initializer);
+            }
+            bindIterativeStatement(node.statement, postLoopLabel, preLoopLabel);
+            addAntecedent(preLoopLabel, currentFlow);
+            currentFlow = finishFlowLabel(postLoopLabel);
+        }
+        function bindIfStatement(node) {
+            var thenLabel = createBranchLabel();
+            var elseLabel = createBranchLabel();
+            var postIfLabel = createBranchLabel();
+            bindCondition(node.expression, thenLabel, elseLabel);
+            currentFlow = finishFlowLabel(thenLabel);
+            bind(node.thenStatement);
+            addAntecedent(postIfLabel, currentFlow);
+            currentFlow = finishFlowLabel(elseLabel);
+            bind(node.elseStatement);
+            addAntecedent(postIfLabel, currentFlow);
+            currentFlow = finishFlowLabel(postIfLabel);
+        }
+        function bindReturnOrThrow(node) {
+            bind(node.expression);
+            if (node.kind === 225 /* ReturnStatement */) {
+                hasExplicitReturn = true;
+                if (currentReturnTarget) {
+                    addAntecedent(currentReturnTarget, currentFlow);
+                }
+            }
+            currentFlow = unreachableFlow;
+        }
+        function findActiveLabel(name) {
+            if (activeLabels) {
+                for (var _i = 0, activeLabels_1 = activeLabels; _i < activeLabels_1.length; _i++) {
+                    var label = activeLabels_1[_i];
+                    if (label.name === name) {
+                        return label;
+                    }
+                }
+            }
+            return undefined;
+        }
+        function bindBreakOrContinueFlow(node, breakTarget, continueTarget) {
+            var flowLabel = node.kind === 224 /* BreakStatement */ ? breakTarget : continueTarget;
+            if (flowLabel) {
+                addAntecedent(flowLabel, currentFlow);
+                currentFlow = unreachableFlow;
+            }
+        }
+        function bindBreakOrContinueStatement(node) {
+            bind(node.label);
+            if (node.label) {
+                var activeLabel = findActiveLabel(node.label.escapedText);
+                if (activeLabel) {
+                    activeLabel.referenced = true;
+                    bindBreakOrContinueFlow(node, activeLabel.breakTarget, activeLabel.continueTarget);
+                }
+            }
+            else {
+                bindBreakOrContinueFlow(node, currentBreakTarget, currentContinueTarget);
+            }
+        }
+        function bindTryStatement(node) {
+            var preFinallyLabel = createBranchLabel();
+            var preTryFlow = currentFlow;
+            // TODO: Every statement in try block is potentially an exit point!
+            bind(node.tryBlock);
+            addAntecedent(preFinallyLabel, currentFlow);
+            var flowAfterTry = currentFlow;
+            var flowAfterCatch = unreachableFlow;
+            if (node.catchClause) {
+                currentFlow = preTryFlow;
+                bind(node.catchClause);
+                addAntecedent(preFinallyLabel, currentFlow);
+                flowAfterCatch = currentFlow;
+            }
+            if (node.finallyBlock) {
+                // in finally flow is combined from pre-try/flow from try/flow from catch
+                // pre-flow is necessary to make sure that finally is reachable even if finally flows in both try and finally blocks are unreachable
+                // also for finally blocks we inject two extra edges into the flow graph.
+                // first -> edge that connects pre-try flow with the label at the beginning of the finally block, it has lock associated with it
+                // second -> edge that represents post-finally flow.
+                // these edges are used in following scenario:
+                // let a; (1)
+                // try { a = someOperation(); (2)}
+                // finally { (3) console.log(a) } (4)
+                // (5) a
+                // flow graph for this case looks roughly like this (arrows show ):
+                // (1-pre-try-flow) <--.. <-- (2-post-try-flow)
+                //  ^                                ^
+                //  |*****(3-pre-finally-label) -----|
+                //                ^
+                //                |-- ... <-- (4-post-finally-label) <--- (5)
+                // In case when we walk the flow starting from inside the finally block we want to take edge '*****' into account
+                // since it ensures that finally is always reachable. However when we start outside the finally block and go through label (5)
+                // then edge '*****' should be discarded because label 4 is only reachable if post-finally label-4 is reachable
+                // Simply speaking code inside finally block is treated as reachable as pre-try-flow
+                // since we conservatively assume that any line in try block can throw or return in which case we'll enter finally.
+                // However code after finally is reachable only if control flow was not abrupted in try/catch or finally blocks - it should be composed from
+                // final flows of these blocks without taking pre-try flow into account.
+                //
+                // extra edges that we inject allows to control this behavior
+                // if when walking the flow we step on post-finally edge - we can mark matching pre-finally edge as locked so it will be skipped.
+                var preFinallyFlow = { flags: 2048 /* PreFinally */, antecedent: preTryFlow, lock: {} };
+                addAntecedent(preFinallyLabel, preFinallyFlow);
+                currentFlow = finishFlowLabel(preFinallyLabel);
+                bind(node.finallyBlock);
+                // if flow after finally is unreachable - keep it
+                // otherwise check if flows after try and after catch are unreachable
+                // if yes - convert current flow to unreachable
+                // i.e.
+                // try { return "1" } finally { console.log(1); }
+                // console.log(2); // this line should be unreachable even if flow falls out of finally block
+                if (!(currentFlow.flags & 1 /* Unreachable */)) {
+                    if ((flowAfterTry.flags & 1 /* Unreachable */) && (flowAfterCatch.flags & 1 /* Unreachable */)) {
+                        currentFlow = flowAfterTry === reportedUnreachableFlow || flowAfterCatch === reportedUnreachableFlow
+                            ? reportedUnreachableFlow
+                            : unreachableFlow;
+                    }
+                }
+                if (!(currentFlow.flags & 1 /* Unreachable */)) {
+                    var afterFinallyFlow = { flags: 4096 /* AfterFinally */, antecedent: currentFlow };
+                    preFinallyFlow.lock = afterFinallyFlow;
+                    currentFlow = afterFinallyFlow;
+                }
+            }
+            else {
+                currentFlow = finishFlowLabel(preFinallyLabel);
+            }
+        }
+        function bindSwitchStatement(node) {
+            var postSwitchLabel = createBranchLabel();
+            bind(node.expression);
+            var saveBreakTarget = currentBreakTarget;
+            var savePreSwitchCaseFlow = preSwitchCaseFlow;
+            currentBreakTarget = postSwitchLabel;
+            preSwitchCaseFlow = currentFlow;
+            bind(node.caseBlock);
+            addAntecedent(postSwitchLabel, currentFlow);
+            var hasDefault = ts.forEach(node.caseBlock.clauses, function (c) { return c.kind === 267 /* DefaultClause */; });
+            // We mark a switch statement as possibly exhaustive if it has no default clause and if all
+            // case clauses have unreachable end points (e.g. they all return).
+            node.possiblyExhaustive = !hasDefault && !postSwitchLabel.antecedents;
+            if (!hasDefault) {
+                addAntecedent(postSwitchLabel, createFlowSwitchClause(preSwitchCaseFlow, node, 0, 0));
+            }
+            currentBreakTarget = saveBreakTarget;
+            preSwitchCaseFlow = savePreSwitchCaseFlow;
+            currentFlow = finishFlowLabel(postSwitchLabel);
+        }
+        function bindCaseBlock(node) {
+            var savedSubtreeTransformFlags = subtreeTransformFlags;
+            subtreeTransformFlags = 0;
+            var clauses = node.clauses;
+            var fallthroughFlow = unreachableFlow;
+            for (var i = 0; i < clauses.length; i++) {
+                var clauseStart = i;
+                while (!clauses[i].statements.length && i + 1 < clauses.length) {
+                    bind(clauses[i]);
+                    i++;
+                }
+                var preCaseLabel = createBranchLabel();
+                addAntecedent(preCaseLabel, createFlowSwitchClause(preSwitchCaseFlow, node.parent, clauseStart, i + 1));
+                addAntecedent(preCaseLabel, createFlowSwitchClause(preSwitchCaseFlow, node.parent, clauseStart, i + 1));
+                addAntecedent(preCaseLabel, fallthroughFlow);
+                currentFlow = finishFlowLabel(preCaseLabel);
+                var clause = clauses[i];
+                bind(clause);
+                fallthroughFlow = currentFlow;
+                if (!(currentFlow.flags & 1 /* Unreachable */) && i !== clauses.length - 1 && options.noFallthroughCasesInSwitch) {
+                    errorOnFirstToken(clause, ts.Diagnostics.Fallthrough_case_in_switch);
+                }
+            }
+            clauses.transformFlags = subtreeTransformFlags | 536870912 /* HasComputedFlags */;
+            subtreeTransformFlags |= savedSubtreeTransformFlags;
+        }
+        function bindCaseClause(node) {
+            var saveCurrentFlow = currentFlow;
+            currentFlow = preSwitchCaseFlow;
+            bind(node.expression);
+            currentFlow = saveCurrentFlow;
+            bindEach(node.statements);
+        }
+        function pushActiveLabel(name, breakTarget, continueTarget) {
+            var activeLabel = {
+                name: name,
+                breakTarget: breakTarget,
+                continueTarget: continueTarget,
+                referenced: false
+            };
+            (activeLabels || (activeLabels = [])).push(activeLabel);
+            return activeLabel;
+        }
+        function popActiveLabel() {
+            activeLabels.pop();
+        }
+        function bindLabeledStatement(node) {
+            var preStatementLabel = createLoopLabel();
+            var postStatementLabel = createBranchLabel();
+            bind(node.label);
+            addAntecedent(preStatementLabel, currentFlow);
+            var activeLabel = pushActiveLabel(node.label.escapedText, postStatementLabel, preStatementLabel);
+            bind(node.statement);
+            popActiveLabel();
+            if (!activeLabel.referenced && !options.allowUnusedLabels) {
+                errorOrSuggestionOnFirstToken(ts.unusedLabelIsError(options), node, ts.Diagnostics.Unused_label);
+            }
+            if (!node.statement || node.statement.kind !== 218 /* DoStatement */) {
+                // do statement sets current flow inside bindDoStatement
+                addAntecedent(postStatementLabel, currentFlow);
+                currentFlow = finishFlowLabel(postStatementLabel);
+            }
+        }
+        function bindDestructuringTargetFlow(node) {
+            if (node.kind === 200 /* BinaryExpression */ && node.operatorToken.kind === 58 /* EqualsToken */) {
+                bindAssignmentTargetFlow(node.left);
+            }
+            else {
+                bindAssignmentTargetFlow(node);
+            }
+        }
+        function bindAssignmentTargetFlow(node) {
+            if (isNarrowableReference(node)) {
+                currentFlow = createFlowAssignment(currentFlow, node);
+            }
+            else if (node.kind === 183 /* ArrayLiteralExpression */) {
+                for (var _i = 0, _a = node.elements; _i < _a.length; _i++) {
+                    var e = _a[_i];
+                    if (e.kind === 204 /* SpreadElement */) {
+                        bindAssignmentTargetFlow(e.expression);
+                    }
+                    else {
+                        bindDestructuringTargetFlow(e);
+                    }
+                }
+            }
+            else if (node.kind === 184 /* ObjectLiteralExpression */) {
+                for (var _b = 0, _c = node.properties; _b < _c.length; _b++) {
+                    var p = _c[_b];
+                    if (p.kind === 270 /* PropertyAssignment */) {
+                        bindDestructuringTargetFlow(p.initializer);
+                    }
+                    else if (p.kind === 271 /* ShorthandPropertyAssignment */) {
+                        bindAssignmentTargetFlow(p.name);
+                    }
+                    else if (p.kind === 272 /* SpreadAssignment */) {
+                        bindAssignmentTargetFlow(p.expression);
+                    }
+                }
+            }
+        }
+        function bindLogicalExpression(node, trueTarget, falseTarget) {
+            var preRightLabel = createBranchLabel();
+            if (node.operatorToken.kind === 53 /* AmpersandAmpersandToken */) {
+                bindCondition(node.left, preRightLabel, falseTarget);
+            }
+            else {
+                bindCondition(node.left, trueTarget, preRightLabel);
+            }
+            currentFlow = finishFlowLabel(preRightLabel);
+            bind(node.operatorToken);
+            bindCondition(node.right, trueTarget, falseTarget);
+        }
+        function bindPrefixUnaryExpressionFlow(node) {
+            if (node.operator === 51 /* ExclamationToken */) {
+                var saveTrueTarget = currentTrueTarget;
+                currentTrueTarget = currentFalseTarget;
+                currentFalseTarget = saveTrueTarget;
+                bindEachChild(node);
+                currentFalseTarget = currentTrueTarget;
+                currentTrueTarget = saveTrueTarget;
+            }
+            else {
+                bindEachChild(node);
+                if (node.operator === 43 /* PlusPlusToken */ || node.operator === 44 /* MinusMinusToken */) {
+                    bindAssignmentTargetFlow(node.operand);
+                }
+            }
+        }
+        function bindPostfixUnaryExpressionFlow(node) {
+            bindEachChild(node);
+            if (node.operator === 43 /* PlusPlusToken */ || node.operator === 44 /* MinusMinusToken */) {
+                bindAssignmentTargetFlow(node.operand);
+            }
+        }
+        function bindBinaryExpressionFlow(node) {
+            var operator = node.operatorToken.kind;
+            if (operator === 53 /* AmpersandAmpersandToken */ || operator === 54 /* BarBarToken */) {
+                if (isTopLevelLogicalExpression(node)) {
+                    var postExpressionLabel = createBranchLabel();
+                    bindLogicalExpression(node, postExpressionLabel, postExpressionLabel);
+                    currentFlow = finishFlowLabel(postExpressionLabel);
+                }
+                else {
+                    bindLogicalExpression(node, currentTrueTarget, currentFalseTarget);
+                }
+            }
+            else {
+                bindEachChild(node);
+                if (ts.isAssignmentOperator(operator) && !ts.isAssignmentTarget(node)) {
+                    bindAssignmentTargetFlow(node.left);
+                    if (operator === 58 /* EqualsToken */ && node.left.kind === 186 /* ElementAccessExpression */) {
+                        var elementAccess = node.left;
+                        if (isNarrowableOperand(elementAccess.expression)) {
+                            currentFlow = createFlowArrayMutation(currentFlow, node);
+                        }
+                    }
+                }
+            }
+        }
+        function bindDeleteExpressionFlow(node) {
+            bindEachChild(node);
+            if (node.expression.kind === 185 /* PropertyAccessExpression */) {
+                bindAssignmentTargetFlow(node.expression);
+            }
+        }
+        function bindConditionalExpressionFlow(node) {
+            var trueLabel = createBranchLabel();
+            var falseLabel = createBranchLabel();
+            var postExpressionLabel = createBranchLabel();
+            bindCondition(node.condition, trueLabel, falseLabel);
+            currentFlow = finishFlowLabel(trueLabel);
+            bind(node.questionToken);
+            bind(node.whenTrue);
+            addAntecedent(postExpressionLabel, currentFlow);
+            currentFlow = finishFlowLabel(falseLabel);
+            bind(node.colonToken);
+            bind(node.whenFalse);
+            addAntecedent(postExpressionLabel, currentFlow);
+            currentFlow = finishFlowLabel(postExpressionLabel);
+        }
+        function bindInitializedVariableFlow(node) {
+            var name = !ts.isOmittedExpression(node) ? node.name : undefined;
+            if (ts.isBindingPattern(name)) {
+                for (var _i = 0, _a = name.elements; _i < _a.length; _i++) {
+                    var child = _a[_i];
+                    bindInitializedVariableFlow(child);
+                }
+            }
+            else {
+                currentFlow = createFlowAssignment(currentFlow, node);
+            }
+        }
+        function bindVariableDeclarationFlow(node) {
+            bindEachChild(node);
+            if (node.initializer || ts.isForInOrOfStatement(node.parent.parent)) {
+                bindInitializedVariableFlow(node);
+            }
+        }
+        function bindJSDocTypeAlias(node) {
+            if (node.fullName) {
+                setParentPointers(node, node.fullName);
+            }
+        }
+        function bindCallExpressionFlow(node) {
+            // If the target of the call expression is a function expression or arrow function we have
+            // an immediately invoked function expression (IIFE). Initialize the flowNode property to
+            // the current control flow (which includes evaluation of the IIFE arguments).
+            var expr = node.expression;
+            while (expr.kind === 191 /* ParenthesizedExpression */) {
+                expr = expr.expression;
+            }
+            if (expr.kind === 192 /* FunctionExpression */ || expr.kind === 193 /* ArrowFunction */) {
+                bindEach(node.typeArguments);
+                bindEach(node.arguments);
+                bind(node.expression);
+            }
+            else {
+                bindEachChild(node);
+            }
+            if (node.expression.kind === 185 /* PropertyAccessExpression */) {
+                var propertyAccess = node.expression;
+                if (isNarrowableOperand(propertyAccess.expression) && ts.isPushOrUnshiftIdentifier(propertyAccess.name)) {
+                    currentFlow = createFlowArrayMutation(currentFlow, node);
+                }
+            }
+        }
+        function getContainerFlags(node) {
+            switch (node.kind) {
+                case 205 /* ClassExpression */:
+                case 235 /* ClassDeclaration */:
+                case 238 /* EnumDeclaration */:
+                case 184 /* ObjectLiteralExpression */:
+                case 166 /* TypeLiteral */:
+                case 287 /* JSDocTypeLiteral */:
+                case 263 /* JsxAttributes */:
+                    return 1 /* IsContainer */;
+                case 236 /* InterfaceDeclaration */:
+                    return 1 /* IsContainer */ | 64 /* IsInterface */;
+                case 239 /* ModuleDeclaration */:
+                case 237 /* TypeAliasDeclaration */:
+                case 177 /* MappedType */:
+                    return 1 /* IsContainer */ | 32 /* HasLocals */;
+                case 274 /* SourceFile */:
+                    return 1 /* IsContainer */ | 4 /* IsControlFlowContainer */ | 32 /* HasLocals */;
+                case 154 /* MethodDeclaration */:
+                    if (ts.isObjectLiteralOrClassExpressionMethod(node)) {
+                        return 1 /* IsContainer */ | 4 /* IsControlFlowContainer */ | 32 /* HasLocals */ | 8 /* IsFunctionLike */ | 128 /* IsObjectLiteralOrClassExpressionMethod */;
+                    }
+                // falls through
+                case 155 /* Constructor */:
+                case 234 /* FunctionDeclaration */:
+                case 153 /* MethodSignature */:
+                case 156 /* GetAccessor */:
+                case 157 /* SetAccessor */:
+                case 158 /* CallSignature */:
+                case 288 /* JSDocSignature */:
+                case 284 /* JSDocFunctionType */:
+                case 163 /* FunctionType */:
+                case 159 /* ConstructSignature */:
+                case 160 /* IndexSignature */:
+                case 164 /* ConstructorType */:
+                    return 1 /* IsContainer */ | 4 /* IsControlFlowContainer */ | 32 /* HasLocals */ | 8 /* IsFunctionLike */;
+                case 192 /* FunctionExpression */:
+                case 193 /* ArrowFunction */:
+                    return 1 /* IsContainer */ | 4 /* IsControlFlowContainer */ | 32 /* HasLocals */ | 8 /* IsFunctionLike */ | 16 /* IsFunctionExpression */;
+                case 240 /* ModuleBlock */:
+                    return 4 /* IsControlFlowContainer */;
+                case 152 /* PropertyDeclaration */:
+                    return node.initializer ? 4 /* IsControlFlowContainer */ : 0;
+                case 269 /* CatchClause */:
+                case 220 /* ForStatement */:
+                case 221 /* ForInStatement */:
+                case 222 /* ForOfStatement */:
+                case 241 /* CaseBlock */:
+                    return 2 /* IsBlockScopedContainer */;
+                case 213 /* Block */:
+                    // do not treat blocks directly inside a function as a block-scoped-container.
+                    // Locals that reside in this block should go to the function locals. Otherwise 'x'
+                    // would not appear to be a redeclaration of a block scoped local in the following
+                    // example:
+                    //
+                    //      function foo() {
+                    //          var x;
+                    //          let x;
+                    //      }
+                    //
+                    // If we placed 'var x' into the function locals and 'let x' into the locals of
+                    // the block, then there would be no collision.
+                    //
+                    // By not creating a new block-scoped-container here, we ensure that both 'var x'
+                    // and 'let x' go into the Function-container's locals, and we do get a collision
+                    // conflict.
+                    return ts.isFunctionLike(node.parent) ? 0 /* None */ : 2 /* IsBlockScopedContainer */;
+            }
+            return 0 /* None */;
+        }
+        function addToContainerChain(next) {
+            if (lastContainer) {
+                lastContainer.nextContainer = next;
+            }
+            lastContainer = next;
+        }
+        function declareSymbolAndAddToSymbolTable(node, symbolFlags, symbolExcludes) {
+            switch (container.kind) {
+                // Modules, source files, and classes need specialized handling for how their
+                // members are declared (for example, a member of a class will go into a specific
+                // symbol table depending on if it is static or not). We defer to specialized
+                // handlers to take care of declaring these child members.
+                case 239 /* ModuleDeclaration */:
+                    return declareModuleMember(node, symbolFlags, symbolExcludes);
+                case 274 /* SourceFile */:
+                    return declareSourceFileMember(node, symbolFlags, symbolExcludes);
+                case 205 /* ClassExpression */:
+                case 235 /* ClassDeclaration */:
+                    return declareClassMember(node, symbolFlags, symbolExcludes);
+                case 238 /* EnumDeclaration */:
+                    return declareSymbol(container.symbol.exports, container.symbol, node, symbolFlags, symbolExcludes);
+                case 166 /* TypeLiteral */:
+                case 287 /* JSDocTypeLiteral */:
+                case 184 /* ObjectLiteralExpression */:
+                case 236 /* InterfaceDeclaration */:
+                case 263 /* JsxAttributes */:
+                    // Interface/Object-types always have their children added to the 'members' of
+                    // their container. They are only accessible through an instance of their
+                    // container, and are never in scope otherwise (even inside the body of the
+                    // object / type / interface declaring them). An exception is type parameters,
+                    // which are in scope without qualification (similar to 'locals').
+                    return declareSymbol(container.symbol.members, container.symbol, node, symbolFlags, symbolExcludes);
+                case 163 /* FunctionType */:
+                case 164 /* ConstructorType */:
+                case 158 /* CallSignature */:
+                case 159 /* ConstructSignature */:
+                case 288 /* JSDocSignature */:
+                case 160 /* IndexSignature */:
+                case 154 /* MethodDeclaration */:
+                case 153 /* MethodSignature */:
+                case 155 /* Constructor */:
+                case 156 /* GetAccessor */:
+                case 157 /* SetAccessor */:
+                case 234 /* FunctionDeclaration */:
+                case 192 /* FunctionExpression */:
+                case 193 /* ArrowFunction */:
+                case 284 /* JSDocFunctionType */:
+                case 297 /* JSDocTypedefTag */:
+                case 292 /* JSDocCallbackTag */:
+                case 237 /* TypeAliasDeclaration */:
+                case 177 /* MappedType */:
+                    // All the children of these container types are never visible through another
+                    // symbol (i.e. through another symbol's 'exports' or 'members').  Instead,
+                    // they're only accessed 'lexically' (i.e. from code that exists underneath
+                    // their container in the tree). To accomplish this, we simply add their declared
+                    // symbol to the 'locals' of the container.  These symbols can then be found as
+                    // the type checker walks up the containers, checking them for matching names.
+                    return declareSymbol(container.locals, /*parent*/ undefined, node, symbolFlags, symbolExcludes);
+            }
+        }
+        function declareClassMember(node, symbolFlags, symbolExcludes) {
+            return ts.hasModifier(node, 32 /* Static */)
+                ? declareSymbol(container.symbol.exports, container.symbol, node, symbolFlags, symbolExcludes)
+                : declareSymbol(container.symbol.members, container.symbol, node, symbolFlags, symbolExcludes);
+        }
+        function declareSourceFileMember(node, symbolFlags, symbolExcludes) {
+            return ts.isExternalModule(file)
+                ? declareModuleMember(node, symbolFlags, symbolExcludes)
+                : declareSymbol(file.locals, /*parent*/ undefined, node, symbolFlags, symbolExcludes);
+        }
+        function hasExportDeclarations(node) {
+            var body = node.kind === 274 /* SourceFile */ ? node : node.body;
+            if (body && (body.kind === 274 /* SourceFile */ || body.kind === 240 /* ModuleBlock */)) {
+                for (var _i = 0, _a = body.statements; _i < _a.length; _i++) {
+                    var stat = _a[_i];
+                    if (stat.kind === 250 /* ExportDeclaration */ || stat.kind === 249 /* ExportAssignment */) {
+                        return true;
+                    }
+                }
+            }
+            return false;
+        }
+        function setExportContextFlag(node) {
+            // A declaration source file or ambient module declaration that contains no export declarations (but possibly regular
+            // declarations with export modifiers) is an export context in which declarations are implicitly exported.
+            if (node.flags & 4194304 /* Ambient */ && !hasExportDeclarations(node)) {
+                node.flags |= 32 /* ExportContext */;
+            }
+            else {
+                node.flags &= ~32 /* ExportContext */;
+            }
+        }
+        function bindModuleDeclaration(node) {
+            setExportContextFlag(node);
+            if (ts.isAmbientModule(node)) {
+                if (ts.hasModifier(node, 1 /* Export */)) {
+                    errorOnFirstToken(node, ts.Diagnostics.export_modifier_cannot_be_applied_to_ambient_modules_and_module_augmentations_since_they_are_always_visible);
+                }
+                if (ts.isModuleAugmentationExternal(node)) {
+                    declareModuleSymbol(node);
+                }
+                else {
+                    var pattern = void 0;
+                    if (node.name.kind === 9 /* StringLiteral */) {
+                        var text = node.name.text;
+                        if (ts.hasZeroOrOneAsteriskCharacter(text)) {
+                            pattern = ts.tryParsePattern(text);
+                        }
+                        else {
+                            errorOnFirstToken(node.name, ts.Diagnostics.Pattern_0_can_have_at_most_one_Asterisk_character, text);
+                        }
+                    }
+                    var symbol = declareSymbolAndAddToSymbolTable(node, 512 /* ValueModule */, 67215503 /* ValueModuleExcludes */);
+                    file.patternAmbientModules = ts.append(file.patternAmbientModules, pattern && { pattern: pattern, symbol: symbol });
+                }
+            }
+            else {
+                var state = declareModuleSymbol(node);
+                if (state !== 0 /* NonInstantiated */) {
+                    var symbol = node.symbol;
+                    // if module was already merged with some function, class or non-const enum, treat it as non-const-enum-only
+                    symbol.constEnumOnlyModule = (!(symbol.flags & (16 /* Function */ | 32 /* Class */ | 256 /* RegularEnum */)))
+                        // Current must be `const enum` only
+                        && state === 2 /* ConstEnumOnly */
+                        // Can't have been set to 'false' in a previous merged symbol. ('undefined' OK)
+                        && symbol.constEnumOnlyModule !== false;
+                }
+            }
+        }
+        function declareModuleSymbol(node) {
+            var state = getModuleInstanceState(node);
+            var instantiated = state !== 0 /* NonInstantiated */;
+            declareSymbolAndAddToSymbolTable(node, instantiated ? 512 /* ValueModule */ : 1024 /* NamespaceModule */, instantiated ? 67215503 /* ValueModuleExcludes */ : 0 /* NamespaceModuleExcludes */);
+            return state;
+        }
+        function bindFunctionOrConstructorType(node) {
+            // For a given function symbol "<...>(...) => T" we want to generate a symbol identical
+            // to the one we would get for: { <...>(...): T }
+            //
+            // We do that by making an anonymous type literal symbol, and then setting the function
+            // symbol as its sole member. To the rest of the system, this symbol will be indistinguishable
+            // from an actual type literal symbol you would have gotten had you used the long form.
+            var symbol = createSymbol(131072 /* Signature */, getDeclarationName(node)); // TODO: GH#18217
+            addDeclarationToSymbol(symbol, node, 131072 /* Signature */);
+            var typeLiteralSymbol = createSymbol(2048 /* TypeLiteral */, "__type" /* Type */);
+            addDeclarationToSymbol(typeLiteralSymbol, node, 2048 /* TypeLiteral */);
+            typeLiteralSymbol.members = ts.createSymbolTable();
+            typeLiteralSymbol.members.set(symbol.escapedName, symbol);
+        }
+        function bindObjectLiteralExpression(node) {
+            var ElementKind;
+            (function (ElementKind) {
+                ElementKind[ElementKind["Property"] = 1] = "Property";
+                ElementKind[ElementKind["Accessor"] = 2] = "Accessor";
+            })(ElementKind || (ElementKind = {}));
+            if (inStrictMode) {
+                var seen = ts.createUnderscoreEscapedMap();
+                for (var _i = 0, _a = node.properties; _i < _a.length; _i++) {
+                    var prop = _a[_i];
+                    if (prop.kind === 272 /* SpreadAssignment */ || prop.name.kind !== 71 /* Identifier */) {
+                        continue;
+                    }
+                    var identifier = prop.name;
+                    // ECMA-262 11.1.5 Object Initializer
+                    // If previous is not undefined then throw a SyntaxError exception if any of the following conditions are true
+                    // a.This production is contained in strict code and IsDataDescriptor(previous) is true and
+                    // IsDataDescriptor(propId.descriptor) is true.
+                    //    b.IsDataDescriptor(previous) is true and IsAccessorDescriptor(propId.descriptor) is true.
+                    //    c.IsAccessorDescriptor(previous) is true and IsDataDescriptor(propId.descriptor) is true.
+                    //    d.IsAccessorDescriptor(previous) is true and IsAccessorDescriptor(propId.descriptor) is true
+                    // and either both previous and propId.descriptor have[[Get]] fields or both previous and propId.descriptor have[[Set]] fields
+                    var currentKind = prop.kind === 270 /* PropertyAssignment */ || prop.kind === 271 /* ShorthandPropertyAssignment */ || prop.kind === 154 /* MethodDeclaration */
+                        ? 1 /* Property */
+                        : 2 /* Accessor */;
+                    var existingKind = seen.get(identifier.escapedText);
+                    if (!existingKind) {
+                        seen.set(identifier.escapedText, currentKind);
+                        continue;
+                    }
+                    if (currentKind === 1 /* Property */ && existingKind === 1 /* Property */) {
+                        var span = ts.getErrorSpanForNode(file, identifier);
+                        file.bindDiagnostics.push(ts.createFileDiagnostic(file, span.start, span.length, ts.Diagnostics.An_object_literal_cannot_have_multiple_properties_with_the_same_name_in_strict_mode));
+                    }
+                }
+            }
+            return bindAnonymousDeclaration(node, 4096 /* ObjectLiteral */, "__object" /* Object */);
+        }
+        function bindJsxAttributes(node) {
+            return bindAnonymousDeclaration(node, 4096 /* ObjectLiteral */, "__jsxAttributes" /* JSXAttributes */);
+        }
+        function bindJsxAttribute(node, symbolFlags, symbolExcludes) {
+            return declareSymbolAndAddToSymbolTable(node, symbolFlags, symbolExcludes);
+        }
+        function bindAnonymousDeclaration(node, symbolFlags, name) {
+            var symbol = createSymbol(symbolFlags, name);
+            if (symbolFlags & (8 /* EnumMember */ | 106500 /* ClassMember */)) {
+                symbol.parent = container.symbol;
+            }
+            addDeclarationToSymbol(symbol, node, symbolFlags);
+            return symbol;
+        }
+        function bindBlockScopedDeclaration(node, symbolFlags, symbolExcludes) {
+            switch (blockScopeContainer.kind) {
+                case 239 /* ModuleDeclaration */:
+                    declareModuleMember(node, symbolFlags, symbolExcludes);
+                    break;
+                case 274 /* SourceFile */:
+                    if (ts.isExternalOrCommonJsModule(container)) {
+                        declareModuleMember(node, symbolFlags, symbolExcludes);
+                        break;
+                    }
+                // falls through
+                default:
+                    if (!blockScopeContainer.locals) {
+                        blockScopeContainer.locals = ts.createSymbolTable();
+                        addToContainerChain(blockScopeContainer);
+                    }
+                    declareSymbol(blockScopeContainer.locals, /*parent*/ undefined, node, symbolFlags, symbolExcludes);
+            }
+        }
+        function bindBlockScopedVariableDeclaration(node) {
+            bindBlockScopedDeclaration(node, 2 /* BlockScopedVariable */, 67216319 /* BlockScopedVariableExcludes */);
+        }
+        function delayedBindJSDocTypedefTag() {
+            if (!delayedTypeAliases) {
+                return;
+            }
+            var saveContainer = container;
+            var saveLastContainer = lastContainer;
+            var saveBlockScopeContainer = blockScopeContainer;
+            var saveParent = parent;
+            var saveCurrentFlow = currentFlow;
+            for (var _i = 0, delayedTypeAliases_1 = delayedTypeAliases; _i < delayedTypeAliases_1.length; _i++) {
+                var typeAlias = delayedTypeAliases_1[_i];
+                var host = ts.getJSDocHost(typeAlias);
+                container = ts.findAncestor(host.parent, function (n) { return !!(getContainerFlags(n) & 1 /* IsContainer */); }) || file;
+                blockScopeContainer = ts.getEnclosingBlockScopeContainer(host) || file;
+                currentFlow = { flags: 2 /* Start */ };
+                parent = typeAlias;
+                bind(typeAlias.typeExpression);
+                if (!typeAlias.fullName || typeAlias.fullName.kind === 71 /* Identifier */) {
+                    parent = typeAlias.parent;
+                    bindBlockScopedDeclaration(typeAlias, 524288 /* TypeAlias */, 67901928 /* TypeAliasExcludes */);
+                }
+                else {
+                    bind(typeAlias.fullName);
+                }
+            }
+            container = saveContainer;
+            lastContainer = saveLastContainer;
+            blockScopeContainer = saveBlockScopeContainer;
+            parent = saveParent;
+            currentFlow = saveCurrentFlow;
+        }
+        // The binder visits every node in the syntax tree so it is a convenient place to perform a single localized
+        // check for reserved words used as identifiers in strict mode code.
+        function checkStrictModeIdentifier(node) {
+            if (inStrictMode &&
+                node.originalKeywordKind >= 108 /* FirstFutureReservedWord */ &&
+                node.originalKeywordKind <= 116 /* LastFutureReservedWord */ &&
+                !ts.isIdentifierName(node) &&
+                !(node.flags & 4194304 /* Ambient */)) {
+                // Report error only if there are no parse errors in file
+                if (!file.parseDiagnostics.length) {
+                    file.bindDiagnostics.push(createDiagnosticForNode(node, getStrictModeIdentifierMessage(node), ts.declarationNameToString(node)));
+                }
+            }
+        }
+        function getStrictModeIdentifierMessage(node) {
+            // Provide specialized messages to help the user understand why we think they're in
+            // strict mode.
+            if (ts.getContainingClass(node)) {
+                return ts.Diagnostics.Identifier_expected_0_is_a_reserved_word_in_strict_mode_Class_definitions_are_automatically_in_strict_mode;
+            }
+            if (file.externalModuleIndicator) {
+                return ts.Diagnostics.Identifier_expected_0_is_a_reserved_word_in_strict_mode_Modules_are_automatically_in_strict_mode;
+            }
+            return ts.Diagnostics.Identifier_expected_0_is_a_reserved_word_in_strict_mode;
+        }
+        function checkStrictModeBinaryExpression(node) {
+            if (inStrictMode && ts.isLeftHandSideExpression(node.left) && ts.isAssignmentOperator(node.operatorToken.kind)) {
+                // ECMA 262 (Annex C) The identifier eval or arguments may not appear as the LeftHandSideExpression of an
+                // Assignment operator(11.13) or of a PostfixExpression(11.3)
+                checkStrictModeEvalOrArguments(node, node.left);
+            }
+        }
+        function checkStrictModeCatchClause(node) {
+            // It is a SyntaxError if a TryStatement with a Catch occurs within strict code and the Identifier of the
+            // Catch production is eval or arguments
+            if (inStrictMode && node.variableDeclaration) {
+                checkStrictModeEvalOrArguments(node, node.variableDeclaration.name);
+            }
+        }
+        function checkStrictModeDeleteExpression(node) {
+            // Grammar checking
+            if (inStrictMode && node.expression.kind === 71 /* Identifier */) {
+                // When a delete operator occurs within strict mode code, a SyntaxError is thrown if its
+                // UnaryExpression is a direct reference to a variable, function argument, or function name
+                var span = ts.getErrorSpanForNode(file, node.expression);
+                file.bindDiagnostics.push(ts.createFileDiagnostic(file, span.start, span.length, ts.Diagnostics.delete_cannot_be_called_on_an_identifier_in_strict_mode));
+            }
+        }
+        function isEvalOrArgumentsIdentifier(node) {
+            return ts.isIdentifier(node) && (node.escapedText === "eval" || node.escapedText === "arguments");
+        }
+        function checkStrictModeEvalOrArguments(contextNode, name) {
+            if (name && name.kind === 71 /* Identifier */) {
+                var identifier = name;
+                if (isEvalOrArgumentsIdentifier(identifier)) {
+                    // We check first if the name is inside class declaration or class expression; if so give explicit message
+                    // otherwise report generic error message.
+                    var span = ts.getErrorSpanForNode(file, name);
+                    file.bindDiagnostics.push(ts.createFileDiagnostic(file, span.start, span.length, getStrictModeEvalOrArgumentsMessage(contextNode), ts.idText(identifier)));
+                }
+            }
+        }
+        function getStrictModeEvalOrArgumentsMessage(node) {
+            // Provide specialized messages to help the user understand why we think they're in
+            // strict mode.
+            if (ts.getContainingClass(node)) {
+                return ts.Diagnostics.Invalid_use_of_0_Class_definitions_are_automatically_in_strict_mode;
+            }
+            if (file.externalModuleIndicator) {
+                return ts.Diagnostics.Invalid_use_of_0_Modules_are_automatically_in_strict_mode;
+            }
+            return ts.Diagnostics.Invalid_use_of_0_in_strict_mode;
+        }
+        function checkStrictModeFunctionName(node) {
+            if (inStrictMode) {
+                // It is a SyntaxError if the identifier eval or arguments appears within a FormalParameterList of a strict mode FunctionDeclaration or FunctionExpression (13.1))
+                checkStrictModeEvalOrArguments(node, node.name);
+            }
+        }
+        function getStrictModeBlockScopeFunctionDeclarationMessage(node) {
+            // Provide specialized messages to help the user understand why we think they're in
+            // strict mode.
+            if (ts.getContainingClass(node)) {
+                return ts.Diagnostics.Function_declarations_are_not_allowed_inside_blocks_in_strict_mode_when_targeting_ES3_or_ES5_Class_definitions_are_automatically_in_strict_mode;
+            }
+            if (file.externalModuleIndicator) {
+                return ts.Diagnostics.Function_declarations_are_not_allowed_inside_blocks_in_strict_mode_when_targeting_ES3_or_ES5_Modules_are_automatically_in_strict_mode;
+            }
+            return ts.Diagnostics.Function_declarations_are_not_allowed_inside_blocks_in_strict_mode_when_targeting_ES3_or_ES5;
+        }
+        function checkStrictModeFunctionDeclaration(node) {
+            if (languageVersion < 2 /* ES2015 */) {
+                // Report error if function is not top level function declaration
+                if (blockScopeContainer.kind !== 274 /* SourceFile */ &&
+                    blockScopeContainer.kind !== 239 /* ModuleDeclaration */ &&
+                    !ts.isFunctionLike(blockScopeContainer)) {
+                    // We check first if the name is inside class declaration or class expression; if so give explicit message
+                    // otherwise report generic error message.
+                    var errorSpan = ts.getErrorSpanForNode(file, node);
+                    file.bindDiagnostics.push(ts.createFileDiagnostic(file, errorSpan.start, errorSpan.length, getStrictModeBlockScopeFunctionDeclarationMessage(node)));
+                }
+            }
+        }
+        function checkStrictModeNumericLiteral(node) {
+            if (inStrictMode && node.numericLiteralFlags & 32 /* Octal */) {
+                file.bindDiagnostics.push(createDiagnosticForNode(node, ts.Diagnostics.Octal_literals_are_not_allowed_in_strict_mode));
+            }
+        }
+        function checkStrictModePostfixUnaryExpression(node) {
+            // Grammar checking
+            // The identifier eval or arguments may not appear as the LeftHandSideExpression of an
+            // Assignment operator(11.13) or of a PostfixExpression(11.3) or as the UnaryExpression
+            // operated upon by a Prefix Increment(11.4.4) or a Prefix Decrement(11.4.5) operator.
+            if (inStrictMode) {
+                checkStrictModeEvalOrArguments(node, node.operand);
+            }
+        }
+        function checkStrictModePrefixUnaryExpression(node) {
+            // Grammar checking
+            if (inStrictMode) {
+                if (node.operator === 43 /* PlusPlusToken */ || node.operator === 44 /* MinusMinusToken */) {
+                    checkStrictModeEvalOrArguments(node, node.operand);
+                }
+            }
+        }
+        function checkStrictModeWithStatement(node) {
+            // Grammar checking for withStatement
+            if (inStrictMode) {
+                errorOnFirstToken(node, ts.Diagnostics.with_statements_are_not_allowed_in_strict_mode);
+            }
+        }
+        function errorOnFirstToken(node, message, arg0, arg1, arg2) {
+            var span = ts.getSpanOfTokenAtPosition(file, node.pos);
+            file.bindDiagnostics.push(ts.createFileDiagnostic(file, span.start, span.length, message, arg0, arg1, arg2));
+        }
+        function errorOrSuggestionOnFirstToken(isError, node, message, arg0, arg1, arg2) {
+            var span = ts.getSpanOfTokenAtPosition(file, node.pos);
+            var diag = ts.createFileDiagnostic(file, span.start, span.length, message, arg0, arg1, arg2);
+            if (isError) {
+                file.bindDiagnostics.push(diag);
+            }
+            else {
+                file.bindSuggestionDiagnostics = ts.append(file.bindSuggestionDiagnostics, __assign({}, diag, { category: ts.DiagnosticCategory.Suggestion }));
+            }
+        }
+        function bind(node) {
+            if (!node) {
+                return;
+            }
+            node.parent = parent;
+            var saveInStrictMode = inStrictMode;
+            // Even though in the AST the jsdoc @typedef node belongs to the current node,
+            // its symbol might be in the same scope with the current node's symbol. Consider:
+            //
+            //     /** @typedef {string | number} MyType */
+            //     function foo();
+            //
+            // Here the current node is "foo", which is a container, but the scope of "MyType" should
+            // not be inside "foo". Therefore we always bind @typedef before bind the parent node,
+            // and skip binding this tag later when binding all the other jsdoc tags.
+            // First we bind declaration nodes to a symbol if possible. We'll both create a symbol
+            // and then potentially add the symbol to an appropriate symbol table. Possible
+            // destination symbol tables are:
+            //
+            //  1) The 'exports' table of the current container's symbol.
+            //  2) The 'members' table of the current container's symbol.
+            //  3) The 'locals' table of the current container.
+            //
+            // However, not all symbols will end up in any of these tables. 'Anonymous' symbols
+            // (like TypeLiterals for example) will not be put in any table.
+            bindWorker(node);
+            // Then we recurse into the children of the node to bind them as well. For certain
+            // symbols we do specialized work when we recurse. For example, we'll keep track of
+            // the current 'container' node when it changes. This helps us know which symbol table
+            // a local should go into for example. Since terminal nodes are known not to have
+            // children, as an optimization we don't process those.
+            if (node.kind > 145 /* LastToken */) {
+                var saveParent = parent;
+                parent = node;
+                var containerFlags = getContainerFlags(node);
+                if (containerFlags === 0 /* None */) {
+                    bindChildren(node);
+                }
+                else {
+                    bindContainer(node, containerFlags);
+                }
+                parent = saveParent;
+            }
+            else if (!skipTransformFlagAggregation && (node.transformFlags & 536870912 /* HasComputedFlags */) === 0) {
+                subtreeTransformFlags |= computeTransformFlagsForNode(node, 0);
+                bindJSDoc(node);
+            }
+            inStrictMode = saveInStrictMode;
+        }
+        function bindJSDoc(node) {
+            if (ts.hasJSDocNodes(node)) {
+                if (ts.isInJavaScriptFile(node)) {
+                    for (var _i = 0, _a = node.jsDoc; _i < _a.length; _i++) {
+                        var j = _a[_i];
+                        bind(j);
+                    }
+                }
+                else {
+                    for (var _b = 0, _c = node.jsDoc; _b < _c.length; _b++) {
+                        var j = _c[_b];
+                        setParentPointers(node, j);
+                    }
+                }
+            }
+        }
+        function updateStrictModeStatementList(statements) {
+            if (!inStrictMode) {
+                for (var _i = 0, statements_1 = statements; _i < statements_1.length; _i++) {
+                    var statement = statements_1[_i];
+                    if (!ts.isPrologueDirective(statement)) {
+                        return;
+                    }
+                    if (isUseStrictPrologueDirective(statement)) {
+                        inStrictMode = true;
+                        return;
+                    }
+                }
+            }
+        }
+        /// Should be called only on prologue directives (isPrologueDirective(node) should be true)
+        function isUseStrictPrologueDirective(node) {
+            var nodeText = ts.getSourceTextOfNodeFromSourceFile(file, node.expression);
+            // Note: the node text must be exactly "use strict" or 'use strict'.  It is not ok for the
+            // string to contain unicode escapes (as per ES5).
+            return nodeText === '"use strict"' || nodeText === "'use strict'";
+        }
+        function bindWorker(node) {
+            switch (node.kind) {
+                /* Strict mode checks */
+                case 71 /* Identifier */:
+                    // for typedef type names with namespaces, bind the new jsdoc type symbol here
+                    // because it requires all containing namespaces to be in effect, namely the
+                    // current "blockScopeContainer" needs to be set to its immediate namespace parent.
+                    if (node.isInJSDocNamespace) {
+                        var parentNode = node.parent;
+                        while (parentNode && !ts.isJSDocTypeAlias(parentNode)) {
+                            parentNode = parentNode.parent;
+                        }
+                        bindBlockScopedDeclaration(parentNode, 524288 /* TypeAlias */, 67901928 /* TypeAliasExcludes */);
+                        break;
+                    }
+                // falls through
+                case 99 /* ThisKeyword */:
+                    if (currentFlow && (ts.isExpression(node) || parent.kind === 271 /* ShorthandPropertyAssignment */)) {
+                        node.flowNode = currentFlow;
+                    }
+                    return checkStrictModeIdentifier(node);
+                case 185 /* PropertyAccessExpression */:
+                    if (currentFlow && isNarrowableReference(node)) {
+                        node.flowNode = currentFlow;
+                    }
+                    if (ts.isSpecialPropertyDeclaration(node)) {
+                        bindSpecialPropertyDeclaration(node);
+                    }
+                    break;
+                case 200 /* BinaryExpression */:
+                    var specialKind = ts.getSpecialPropertyAssignmentKind(node);
+                    switch (specialKind) {
+                        case 1 /* ExportsProperty */:
+                            bindExportsPropertyAssignment(node);
+                            break;
+                        case 2 /* ModuleExports */:
+                            bindModuleExportsAssignment(node);
+                            break;
+                        case 3 /* PrototypeProperty */:
+                            bindPrototypePropertyAssignment(node.left, node);
+                            break;
+                        case 6 /* Prototype */:
+                            bindPrototypeAssignment(node);
+                            break;
+                        case 4 /* ThisProperty */:
+                            bindThisPropertyAssignment(node);
+                            break;
+                        case 5 /* Property */:
+                            bindSpecialPropertyAssignment(node);
+                            break;
+                        case 0 /* None */:
+                            // Nothing to do
+                            break;
+                        default:
+                            ts.Debug.fail("Unknown special property assignment kind");
+                    }
+                    return checkStrictModeBinaryExpression(node);
+                case 269 /* CatchClause */:
+                    return checkStrictModeCatchClause(node);
+                case 194 /* DeleteExpression */:
+                    return checkStrictModeDeleteExpression(node);
+                case 8 /* NumericLiteral */:
+                    return checkStrictModeNumericLiteral(node);
+                case 199 /* PostfixUnaryExpression */:
+                    return checkStrictModePostfixUnaryExpression(node);
+                case 198 /* PrefixUnaryExpression */:
+                    return checkStrictModePrefixUnaryExpression(node);
+                case 226 /* WithStatement */:
+                    return checkStrictModeWithStatement(node);
+                case 174 /* ThisType */:
+                    seenThisKeyword = true;
+                    return;
+                case 161 /* TypePredicate */:
+                    break; // Binding the children will handle everything
+                case 148 /* TypeParameter */:
+                    return bindTypeParameter(node);
+                case 149 /* Parameter */:
+                    return bindParameter(node);
+                case 232 /* VariableDeclaration */:
+                    return bindVariableDeclarationOrBindingElement(node);
+                case 182 /* BindingElement */:
+                    node.flowNode = currentFlow;
+                    return bindVariableDeclarationOrBindingElement(node);
+                case 152 /* PropertyDeclaration */:
+                case 151 /* PropertySignature */:
+                    return bindPropertyWorker(node);
+                case 270 /* PropertyAssignment */:
+                case 271 /* ShorthandPropertyAssignment */:
+                    return bindPropertyOrMethodOrAccessor(node, 4 /* Property */, 0 /* PropertyExcludes */);
+                case 273 /* EnumMember */:
+                    return bindPropertyOrMethodOrAccessor(node, 8 /* EnumMember */, 68008959 /* EnumMemberExcludes */);
+                case 158 /* CallSignature */:
+                case 159 /* ConstructSignature */:
+                case 160 /* IndexSignature */:
+                    return declareSymbolAndAddToSymbolTable(node, 131072 /* Signature */, 0 /* None */);
+                case 154 /* MethodDeclaration */:
+                case 153 /* MethodSignature */:
+                    // If this is an ObjectLiteralExpression method, then it sits in the same space
+                    // as other properties in the object literal.  So we use SymbolFlags.PropertyExcludes
+                    // so that it will conflict with any other object literal members with the same
+                    // name.
+                    return bindPropertyOrMethodOrAccessor(node, 8192 /* Method */ | (node.questionToken ? 16777216 /* Optional */ : 0 /* None */), ts.isObjectLiteralMethod(node) ? 0 /* PropertyExcludes */ : 67208127 /* MethodExcludes */);
+                case 234 /* FunctionDeclaration */:
+                    return bindFunctionDeclaration(node);
+                case 155 /* Constructor */:
+                    return declareSymbolAndAddToSymbolTable(node, 16384 /* Constructor */, /*symbolExcludes:*/ 0 /* None */);
+                case 156 /* GetAccessor */:
+                    return bindPropertyOrMethodOrAccessor(node, 32768 /* GetAccessor */, 67150783 /* GetAccessorExcludes */);
+                case 157 /* SetAccessor */:
+                    return bindPropertyOrMethodOrAccessor(node, 65536 /* SetAccessor */, 67183551 /* SetAccessorExcludes */);
+                case 163 /* FunctionType */:
+                case 284 /* JSDocFunctionType */:
+                case 288 /* JSDocSignature */:
+                case 164 /* ConstructorType */:
+                    return bindFunctionOrConstructorType(node);
+                case 166 /* TypeLiteral */:
+                case 287 /* JSDocTypeLiteral */:
+                case 177 /* MappedType */:
+                    return bindAnonymousTypeWorker(node);
+                case 184 /* ObjectLiteralExpression */:
+                    return bindObjectLiteralExpression(node);
+                case 192 /* FunctionExpression */:
+                case 193 /* ArrowFunction */:
+                    return bindFunctionExpression(node);
+                case 187 /* CallExpression */:
+                    if (ts.isInJavaScriptFile(node)) {
+                        bindCallExpression(node);
+                    }
+                    break;
+                // Members of classes, interfaces, and modules
+                case 205 /* ClassExpression */:
+                case 235 /* ClassDeclaration */:
+                    // All classes are automatically in strict mode in ES6.
+                    inStrictMode = true;
+                    return bindClassLikeDeclaration(node);
+                case 236 /* InterfaceDeclaration */:
+                    return bindBlockScopedDeclaration(node, 64 /* Interface */, 67901832 /* InterfaceExcludes */);
+                case 237 /* TypeAliasDeclaration */:
+                    return bindBlockScopedDeclaration(node, 524288 /* TypeAlias */, 67901928 /* TypeAliasExcludes */);
+                case 238 /* EnumDeclaration */:
+                    return bindEnumDeclaration(node);
+                case 239 /* ModuleDeclaration */:
+                    return bindModuleDeclaration(node);
+                // Jsx-attributes
+                case 263 /* JsxAttributes */:
+                    return bindJsxAttributes(node);
+                case 262 /* JsxAttribute */:
+                    return bindJsxAttribute(node, 4 /* Property */, 0 /* PropertyExcludes */);
+                // Imports and exports
+                case 243 /* ImportEqualsDeclaration */:
+                case 246 /* NamespaceImport */:
+                case 248 /* ImportSpecifier */:
+                case 252 /* ExportSpecifier */:
+                    return declareSymbolAndAddToSymbolTable(node, 2097152 /* Alias */, 2097152 /* AliasExcludes */);
+                case 242 /* NamespaceExportDeclaration */:
+                    return bindNamespaceExportDeclaration(node);
+                case 245 /* ImportClause */:
+                    return bindImportClause(node);
+                case 250 /* ExportDeclaration */:
+                    return bindExportDeclaration(node);
+                case 249 /* ExportAssignment */:
+                    return bindExportAssignment(node);
+                case 274 /* SourceFile */:
+                    updateStrictModeStatementList(node.statements);
+                    return bindSourceFileIfExternalModule();
+                case 213 /* Block */:
+                    if (!ts.isFunctionLike(node.parent)) {
+                        return;
+                    }
+                // falls through
+                case 240 /* ModuleBlock */:
+                    return updateStrictModeStatementList(node.statements);
+                case 293 /* JSDocParameterTag */:
+                    if (node.parent.kind === 288 /* JSDocSignature */) {
+                        return bindParameter(node);
+                    }
+                    if (node.parent.kind !== 287 /* JSDocTypeLiteral */) {
+                        break;
+                    }
+                // falls through
+                case 298 /* JSDocPropertyTag */:
+                    var propTag = node;
+                    var flags = propTag.isBracketed || propTag.typeExpression && propTag.typeExpression.type.kind === 283 /* JSDocOptionalType */ ?
+                        4 /* Property */ | 16777216 /* Optional */ :
+                        4 /* Property */;
+                    return declareSymbolAndAddToSymbolTable(propTag, flags, 0 /* PropertyExcludes */);
+                case 297 /* JSDocTypedefTag */:
+                case 292 /* JSDocCallbackTag */:
+                    return (delayedTypeAliases || (delayedTypeAliases = [])).push(node);
+            }
+        }
+        function bindPropertyWorker(node) {
+            return bindPropertyOrMethodOrAccessor(node, 4 /* Property */ | (node.questionToken ? 16777216 /* Optional */ : 0 /* None */), 0 /* PropertyExcludes */);
+        }
+        function bindAnonymousTypeWorker(node) {
+            return bindAnonymousDeclaration(node, 2048 /* TypeLiteral */, "__type" /* Type */);
+        }
+        function bindSourceFileIfExternalModule() {
+            setExportContextFlag(file);
+            if (ts.isExternalModule(file)) {
+                bindSourceFileAsExternalModule();
+            }
+            else if (ts.isJsonSourceFile(file)) {
+                bindSourceFileAsExternalModule();
+                // Create symbol equivalent for the module.exports = {}
+                var originalSymbol = file.symbol;
+                declareSymbol(file.symbol.exports, file.symbol, file, 4 /* Property */, 67108863 /* All */);
+                file.symbol = originalSymbol;
+            }
+        }
+        function bindSourceFileAsExternalModule() {
+            bindAnonymousDeclaration(file, 512 /* ValueModule */, "\"" + ts.removeFileExtension(file.fileName) + "\"");
+        }
+        function bindExportAssignment(node) {
+            if (!container.symbol || !container.symbol.exports) {
+                // Export assignment in some sort of block construct
+                bindAnonymousDeclaration(node, 2097152 /* Alias */, getDeclarationName(node));
+            }
+            else {
+                var flags = node.kind === 249 /* ExportAssignment */ && ts.exportAssignmentIsAlias(node)
+                    // An export default clause with an EntityNameExpression or a class expression exports all meanings of that identifier or expression;
+                    ? 2097152 /* Alias */
+                    // An export default clause with any other expression exports a value
+                    : 4 /* Property */;
+                // If there is an `export default x;` alias declaration, can't `export default` anything else.
+                // (In contrast, you can still have `export default function f() {}` and `export default interface I {}`.)
+                declareSymbol(container.symbol.exports, container.symbol, node, flags, 67108863 /* All */);
+            }
+        }
+        function bindNamespaceExportDeclaration(node) {
+            if (node.modifiers && node.modifiers.length) {
+                file.bindDiagnostics.push(createDiagnosticForNode(node, ts.Diagnostics.Modifiers_cannot_appear_here));
+            }
+            if (node.parent.kind !== 274 /* SourceFile */) {
+                file.bindDiagnostics.push(createDiagnosticForNode(node, ts.Diagnostics.Global_module_exports_may_only_appear_at_top_level));
+                return;
+            }
+            else {
+                var parent_1 = node.parent;
+                if (!ts.isExternalModule(parent_1)) {
+                    file.bindDiagnostics.push(createDiagnosticForNode(node, ts.Diagnostics.Global_module_exports_may_only_appear_in_module_files));
+                    return;
+                }
+                if (!parent_1.isDeclarationFile) {
+                    file.bindDiagnostics.push(createDiagnosticForNode(node, ts.Diagnostics.Global_module_exports_may_only_appear_in_declaration_files));
+                    return;
+                }
+            }
+            file.symbol.globalExports = file.symbol.globalExports || ts.createSymbolTable();
+            declareSymbol(file.symbol.globalExports, file.symbol, node, 2097152 /* Alias */, 2097152 /* AliasExcludes */);
+        }
+        function bindExportDeclaration(node) {
+            if (!container.symbol || !container.symbol.exports) {
+                // Export * in some sort of block construct
+                bindAnonymousDeclaration(node, 8388608 /* ExportStar */, getDeclarationName(node));
+            }
+            else if (!node.exportClause) {
+                // All export * declarations are collected in an __export symbol
+                declareSymbol(container.symbol.exports, container.symbol, node, 8388608 /* ExportStar */, 0 /* None */);
+            }
+        }
+        function bindImportClause(node) {
+            if (node.name) {
+                declareSymbolAndAddToSymbolTable(node, 2097152 /* Alias */, 2097152 /* AliasExcludes */);
+            }
+        }
+        function setCommonJsModuleIndicator(node) {
+            if (!file.commonJsModuleIndicator) {
+                file.commonJsModuleIndicator = node;
+                if (!file.externalModuleIndicator) {
+                    bindSourceFileAsExternalModule();
+                }
+            }
+        }
+        function bindExportsPropertyAssignment(node) {
+            // When we create a property via 'exports.foo = bar', the 'exports.foo' property access
+            // expression is the declaration
+            setCommonJsModuleIndicator(node);
+            var lhs = node.left;
+            var symbol = forEachIdentifierInEntityName(lhs.expression, /*parent*/ undefined, function (id, symbol) {
+                if (symbol) {
+                    addDeclarationToSymbol(symbol, id, 1536 /* Module */ | 67108864 /* JSContainer */);
+                }
+                return symbol;
+            });
+            if (symbol) {
+                var flags = ts.isClassExpression(node.right) ?
+                    4 /* Property */ | 1048576 /* ExportValue */ | 32 /* Class */ :
+                    4 /* Property */ | 1048576 /* ExportValue */;
+                declareSymbol(symbol.exports, symbol, lhs, flags, 0 /* None */);
+            }
+        }
+        function bindModuleExportsAssignment(node) {
+            // A common practice in node modules is to set 'export = module.exports = {}', this ensures that 'exports'
+            // is still pointing to 'module.exports'.
+            // We do not want to consider this as 'export=' since a module can have only one of these.
+            // Similarly we do not want to treat 'module.exports = exports' as an 'export='.
+            var assignedExpression = ts.getRightMostAssignedExpression(node.right);
+            if (ts.isEmptyObjectLiteral(assignedExpression) || container === file && isExportsOrModuleExportsOrAlias(file, assignedExpression)) {
+                // Mark it as a module in case there are no other exports in the file
+                setCommonJsModuleIndicator(node);
+                return;
+            }
+            // 'module.exports = expr' assignment
+            setCommonJsModuleIndicator(node);
+            var flags = ts.exportAssignmentIsAlias(node)
+                ? 2097152 /* Alias */
+                : 4 /* Property */ | 1048576 /* ExportValue */ | 512 /* ValueModule */;
+            declareSymbol(file.symbol.exports, file.symbol, node, flags, 0 /* None */);
+        }
+        function bindThisPropertyAssignment(node) {
+            ts.Debug.assert(ts.isInJavaScriptFile(node));
+            var thisContainer = ts.getThisContainer(node, /*includeArrowFunctions*/ false);
+            switch (thisContainer.kind) {
+                case 234 /* FunctionDeclaration */:
+                case 192 /* FunctionExpression */:
+                    var constructorSymbol = thisContainer.symbol;
+                    // For `f.prototype.m = function() { this.x = 0; }`, `this.x = 0` should modify `f`'s members, not the function expression.
+                    if (ts.isBinaryExpression(thisContainer.parent) && thisContainer.parent.operatorToken.kind === 58 /* EqualsToken */) {
+                        var l = thisContainer.parent.left;
+                        if (ts.isPropertyAccessEntityNameExpression(l) && ts.isPrototypeAccess(l.expression)) {
+                            constructorSymbol = lookupSymbolForPropertyAccess(l.expression.expression, thisParentContainer);
+                        }
+                    }
+                    if (constructorSymbol) {
+                        // Declare a 'member' if the container is an ES5 class or ES6 constructor
+                        constructorSymbol.members = constructorSymbol.members || ts.createSymbolTable();
+                        // It's acceptable for multiple 'this' assignments of the same identifier to occur
+                        declareSymbol(constructorSymbol.members, constructorSymbol, node, 4 /* Property */, 0 /* PropertyExcludes */ & ~4 /* Property */);
+                    }
+                    break;
+                case 155 /* Constructor */:
+                case 152 /* PropertyDeclaration */:
+                case 154 /* MethodDeclaration */:
+                case 156 /* GetAccessor */:
+                case 157 /* SetAccessor */:
+                    // this.foo assignment in a JavaScript class
+                    // Bind this property to the containing class
+                    var containingClass = thisContainer.parent;
+                    var symbolTable = ts.hasModifier(thisContainer, 32 /* Static */) ? containingClass.symbol.exports : containingClass.symbol.members;
+                    declareSymbol(symbolTable, containingClass.symbol, node, 4 /* Property */, 0 /* None */, /*isReplaceableByMethod*/ true);
+                    break;
+                case 274 /* SourceFile */:
+                    // this.foo assignment in a source file
+                    // Do not bind. It would be nice to support this someday though.
+                    break;
+                default:
+                    ts.Debug.fail(ts.Debug.showSyntaxKind(thisContainer));
+            }
+        }
+        function bindSpecialPropertyDeclaration(node) {
+            if (node.expression.kind === 99 /* ThisKeyword */) {
+                bindThisPropertyAssignment(node);
+            }
+            else if (ts.isPropertyAccessEntityNameExpression(node) && node.parent.parent.kind === 274 /* SourceFile */) {
+                if (ts.isPrototypeAccess(node.expression)) {
+                    bindPrototypePropertyAssignment(node, node.parent);
+                }
+                else {
+                    bindStaticPropertyAssignment(node);
+                }
+            }
+        }
+        /** For `x.prototype = { p, ... }`, declare members p,... if `x` is function/class/{}, or not declared. */
+        function bindPrototypeAssignment(node) {
+            node.left.parent = node;
+            node.right.parent = node;
+            var lhs = node.left;
+            bindPropertyAssignment(lhs, lhs, /*isPrototypeProperty*/ false);
+        }
+        /**
+         * For `x.prototype.y = z`, declare a member `y` on `x` if `x` is a function or class, or not declared.
+         * Note that jsdoc preceding an ExpressionStatement like `x.prototype.y;` is also treated as a declaration.
+         */
+        function bindPrototypePropertyAssignment(lhs, parent) {
+            // Look up the function in the local scope, since prototype assignments should
+            // follow the function declaration
+            var classPrototype = lhs.expression;
+            var constructorFunction = classPrototype.expression;
+            // Fix up parent pointers since we're going to use these nodes before we bind into them
+            lhs.parent = parent;
+            constructorFunction.parent = classPrototype;
+            classPrototype.parent = lhs;
+            bindPropertyAssignment(constructorFunction, lhs, /*isPrototypeProperty*/ true);
+        }
+        function bindSpecialPropertyAssignment(node) {
+            var lhs = node.left;
+            // Fix up parent pointers since we're going to use these nodes before we bind into them
+            node.left.parent = node;
+            node.right.parent = node;
+            if (ts.isIdentifier(lhs.expression) && container === file && isNameOfExportsOrModuleExportsAliasDeclaration(file, lhs.expression)) {
+                // This can be an alias for the 'exports' or 'module.exports' names, e.g.
+                //    var util = module.exports;
+                //    util.property = function ...
+                bindExportsPropertyAssignment(node);
+            }
+            else {
+                bindStaticPropertyAssignment(lhs);
+            }
+        }
+        /**
+         * For nodes like `x.y = z`, declare a member 'y' on 'x' if x is a function (or IIFE) or class or {}, or not declared.
+         * Also works for expression statements preceded by JSDoc, like / ** @type number * / x.y;
+         */
+        function bindStaticPropertyAssignment(node) {
+            node.expression.parent = node;
+            bindPropertyAssignment(node.expression, node, /*isPrototypeProperty*/ false);
+        }
+        function bindPropertyAssignment(name, propertyAccess, isPrototypeProperty) {
+            var namespaceSymbol = lookupSymbolForPropertyAccess(name);
+            var isToplevelNamespaceableInitializer = ts.isBinaryExpression(propertyAccess.parent)
+                ? getParentOfBinaryExpression(propertyAccess.parent).parent.kind === 274 /* SourceFile */ &&
+                    !!ts.getJavascriptInitializer(ts.getInitializerOfBinaryExpression(propertyAccess.parent), ts.isPrototypeAccess(propertyAccess.parent.left))
+                : propertyAccess.parent.parent.kind === 274 /* SourceFile */;
+            if (!isPrototypeProperty && (!namespaceSymbol || !(namespaceSymbol.flags & 1920 /* Namespace */)) && isToplevelNamespaceableInitializer) {
+                // make symbols or add declarations for intermediate containers
+                var flags_1 = 1536 /* Module */ | 67108864 /* JSContainer */;
+                var excludeFlags_1 = 67215503 /* ValueModuleExcludes */ & ~67108864 /* JSContainer */;
+                namespaceSymbol = forEachIdentifierInEntityName(propertyAccess.expression, namespaceSymbol, function (id, symbol, parent) {
+                    if (symbol) {
+                        addDeclarationToSymbol(symbol, id, flags_1);
+                        return symbol;
+                    }
+                    else {
+                        return declareSymbol(parent ? parent.exports : container.locals, parent, id, flags_1, excludeFlags_1);
+                    }
+                });
+            }
+            if (!namespaceSymbol || !isJavascriptContainer(namespaceSymbol)) {
+                return;
+            }
+            // Set up the members collection if it doesn't exist already
+            var symbolTable = isPrototypeProperty ?
+                (namespaceSymbol.members || (namespaceSymbol.members = ts.createSymbolTable())) :
+                (namespaceSymbol.exports || (namespaceSymbol.exports = ts.createSymbolTable()));
+            // Declare the method/property
+            var jsContainerFlag = isToplevelNamespaceableInitializer ? 67108864 /* JSContainer */ : 0;
+            var isMethod = ts.isFunctionLikeDeclaration(ts.getAssignedJavascriptInitializer(propertyAccess));
+            var symbolFlags = (isMethod ? 8192 /* Method */ : 4 /* Property */) | jsContainerFlag;
+            var symbolExcludes = (isMethod ? 67208127 /* MethodExcludes */ : 0 /* PropertyExcludes */) & ~jsContainerFlag;
+            declareSymbol(symbolTable, namespaceSymbol, propertyAccess, symbolFlags, symbolExcludes);
+        }
+        /**
+         * Javascript containers are:
+         * - Functions
+         * - classes
+         * - namespaces
+         * - variables initialized with function expressions
+         * -                       with class expressions
+         * -                       with empty object literals
+         * -                       with non-empty object literals if assigned to the prototype property
+         */
+        function isJavascriptContainer(symbol) {
+            if (symbol.flags & (16 /* Function */ | 32 /* Class */ | 1024 /* NamespaceModule */)) {
+                return true;
+            }
+            var node = symbol.valueDeclaration;
+            var init = !node ? undefined :
+                ts.isVariableDeclaration(node) ? node.initializer :
+                    ts.isBinaryExpression(node) ? node.right :
+                        ts.isPropertyAccessExpression(node) && ts.isBinaryExpression(node.parent) ? node.parent.right :
+                            undefined;
+            if (init) {
+                var isPrototypeAssignment = ts.isPrototypeAccess(ts.isVariableDeclaration(node) ? node.name : ts.isBinaryExpression(node) ? node.left : node);
+                return !!ts.getJavascriptInitializer(ts.isBinaryExpression(init) && init.operatorToken.kind === 54 /* BarBarToken */ ? init.right : init, isPrototypeAssignment);
+            }
+            return false;
+        }
+        function getParentOfBinaryExpression(expr) {
+            while (ts.isBinaryExpression(expr.parent)) {
+                expr = expr.parent;
+            }
+            return expr.parent;
+        }
+        function lookupSymbolForPropertyAccess(node, lookupContainer) {
+            if (lookupContainer === void 0) { lookupContainer = container; }
+            if (ts.isIdentifier(node)) {
+                return lookupSymbolForNameWorker(lookupContainer, node.escapedText);
+            }
+            else {
+                var symbol = lookupSymbolForPropertyAccess(node.expression);
+                return symbol && symbol.exports && symbol.exports.get(node.name.escapedText);
+            }
+        }
+        function forEachIdentifierInEntityName(e, parent, action) {
+            if (isExportsOrModuleExportsOrAlias(file, e)) {
+                return file.symbol;
+            }
+            else if (ts.isIdentifier(e)) {
+                return action(e, lookupSymbolForPropertyAccess(e), parent);
+            }
+            else {
+                var s = forEachIdentifierInEntityName(e.expression, parent, action);
+                if (!s || !s.exports)
+                    return ts.Debug.fail();
+                return action(e.name, s.exports.get(e.name.escapedText), s);
+            }
+        }
+        function bindCallExpression(node) {
+            // We're only inspecting call expressions to detect CommonJS modules, so we can skip
+            // this check if we've already seen the module indicator
+            if (!file.commonJsModuleIndicator && ts.isRequireCall(node, /*checkArgumentIsStringLiteralLike*/ false)) {
+                setCommonJsModuleIndicator(node);
+            }
+        }
+        function bindClassLikeDeclaration(node) {
+            if (node.kind === 235 /* ClassDeclaration */) {
+                bindBlockScopedDeclaration(node, 32 /* Class */, 68008383 /* ClassExcludes */);
+            }
+            else {
+                var bindingName = node.name ? node.name.escapedText : "__class" /* Class */;
+                bindAnonymousDeclaration(node, 32 /* Class */, bindingName);
+                // Add name of class expression into the map for semantic classifier
+                if (node.name) {
+                    classifiableNames.set(node.name.escapedText, true);
+                }
+            }
+            var symbol = node.symbol;
+            // TypeScript 1.0 spec (April 2014): 8.4
+            // Every class automatically contains a static property member named 'prototype', the
+            // type of which is an instantiation of the class type with type Any supplied as a type
+            // argument for each type parameter. It is an error to explicitly declare a static
+            // property member with the name 'prototype'.
+            //
+            // Note: we check for this here because this class may be merging into a module.  The
+            // module might have an exported variable called 'prototype'.  We can't allow that as
+            // that would clash with the built-in 'prototype' for the class.
+            var prototypeSymbol = createSymbol(4 /* Property */ | 4194304 /* Prototype */, "prototype");
+            var symbolExport = symbol.exports.get(prototypeSymbol.escapedName);
+            if (symbolExport) {
+                if (node.name) {
+                    node.name.parent = node;
+                }
+                file.bindDiagnostics.push(createDiagnosticForNode(symbolExport.declarations[0], ts.Diagnostics.Duplicate_identifier_0, ts.symbolName(prototypeSymbol)));
+            }
+            symbol.exports.set(prototypeSymbol.escapedName, prototypeSymbol);
+            prototypeSymbol.parent = symbol;
+        }
+        function bindEnumDeclaration(node) {
+            return ts.isConst(node)
+                ? bindBlockScopedDeclaration(node, 128 /* ConstEnum */, 68008831 /* ConstEnumExcludes */)
+                : bindBlockScopedDeclaration(node, 256 /* RegularEnum */, 68008191 /* RegularEnumExcludes */);
+        }
+        function bindVariableDeclarationOrBindingElement(node) {
+            if (inStrictMode) {
+                checkStrictModeEvalOrArguments(node, node.name);
+            }
+            if (!ts.isBindingPattern(node.name)) {
+                if (ts.isBlockOrCatchScoped(node)) {
+                    bindBlockScopedVariableDeclaration(node);
+                }
+                else if (ts.isParameterDeclaration(node)) {
+                    // It is safe to walk up parent chain to find whether the node is a destructuring parameter declaration
+                    // because its parent chain has already been set up, since parents are set before descending into children.
+                    //
+                    // If node is a binding element in parameter declaration, we need to use ParameterExcludes.
+                    // Using ParameterExcludes flag allows the compiler to report an error on duplicate identifiers in Parameter Declaration
+                    // For example:
+                    //      function foo([a,a]) {} // Duplicate Identifier error
+                    //      function bar(a,a) {}   // Duplicate Identifier error, parameter declaration in this case is handled in bindParameter
+                    //                             // which correctly set excluded symbols
+                    declareSymbolAndAddToSymbolTable(node, 1 /* FunctionScopedVariable */, 67216319 /* ParameterExcludes */);
+                }
+                else {
+                    declareSymbolAndAddToSymbolTable(node, 1 /* FunctionScopedVariable */, 67216318 /* FunctionScopedVariableExcludes */);
+                }
+            }
+        }
+        function bindParameter(node) {
+            if (node.kind === 293 /* JSDocParameterTag */ && container.kind !== 288 /* JSDocSignature */) {
+                return;
+            }
+            if (inStrictMode && !(node.flags & 4194304 /* Ambient */)) {
+                // It is a SyntaxError if the identifier eval or arguments appears within a FormalParameterList of a
+                // strict mode FunctionLikeDeclaration or FunctionExpression(13.1)
+                checkStrictModeEvalOrArguments(node, node.name);
+            }
+            if (ts.isBindingPattern(node.name)) {
+                bindAnonymousDeclaration(node, 1 /* FunctionScopedVariable */, "__" + node.parent.parameters.indexOf(node));
+            }
+            else {
+                declareSymbolAndAddToSymbolTable(node, 1 /* FunctionScopedVariable */, 67216319 /* ParameterExcludes */);
+            }
+            // If this is a property-parameter, then also declare the property symbol into the
+            // containing class.
+            if (ts.isParameterPropertyDeclaration(node)) {
+                var classDeclaration = node.parent.parent;
+                declareSymbol(classDeclaration.symbol.members, classDeclaration.symbol, node, 4 /* Property */ | (node.questionToken ? 16777216 /* Optional */ : 0 /* None */), 0 /* PropertyExcludes */);
+            }
+        }
+        function bindFunctionDeclaration(node) {
+            if (!file.isDeclarationFile && !(node.flags & 4194304 /* Ambient */)) {
+                if (ts.isAsyncFunction(node)) {
+                    emitFlags |= 1024 /* HasAsyncFunctions */;
+                }
+            }
+            checkStrictModeFunctionName(node);
+            if (inStrictMode) {
+                checkStrictModeFunctionDeclaration(node);
+                bindBlockScopedDeclaration(node, 16 /* Function */, 67215791 /* FunctionExcludes */);
+            }
+            else {
+                declareSymbolAndAddToSymbolTable(node, 16 /* Function */, 67215791 /* FunctionExcludes */);
+            }
+        }
+        function bindFunctionExpression(node) {
+            if (!file.isDeclarationFile && !(node.flags & 4194304 /* Ambient */)) {
+                if (ts.isAsyncFunction(node)) {
+                    emitFlags |= 1024 /* HasAsyncFunctions */;
+                }
+            }
+            if (currentFlow) {
+                node.flowNode = currentFlow;
+            }
+            checkStrictModeFunctionName(node);
+            var bindingName = node.name ? node.name.escapedText : "__function" /* Function */;
+            return bindAnonymousDeclaration(node, 16 /* Function */, bindingName);
+        }
+        function bindPropertyOrMethodOrAccessor(node, symbolFlags, symbolExcludes) {
+            if (!file.isDeclarationFile && !(node.flags & 4194304 /* Ambient */) && ts.isAsyncFunction(node)) {
+                emitFlags |= 1024 /* HasAsyncFunctions */;
+            }
+            if (currentFlow && ts.isObjectLiteralOrClassExpressionMethod(node)) {
+                node.flowNode = currentFlow;
+            }
+            return ts.hasDynamicName(node)
+                ? bindAnonymousDeclaration(node, symbolFlags, "__computed" /* Computed */)
+                : declareSymbolAndAddToSymbolTable(node, symbolFlags, symbolExcludes);
+        }
+        function getInferTypeContainer(node) {
+            var extendsType = ts.findAncestor(node, function (n) { return n.parent && ts.isConditionalTypeNode(n.parent) && n.parent.extendsType === n; });
+            return extendsType && extendsType.parent;
+        }
+        function bindTypeParameter(node) {
+            if (ts.isJSDocTemplateTag(node.parent)) {
+                var container_1 = ts.find(node.parent.parent.tags, ts.isJSDocTypeAlias) || ts.getHostSignatureFromJSDoc(node.parent); // TODO: GH#18217
+                if (container_1) {
+                    if (!container_1.locals) {
+                        container_1.locals = ts.createSymbolTable();
+                    }
+                    declareSymbol(container_1.locals, /*parent*/ undefined, node, 262144 /* TypeParameter */, 67639784 /* TypeParameterExcludes */);
+                }
+                else {
+                    declareSymbolAndAddToSymbolTable(node, 262144 /* TypeParameter */, 67639784 /* TypeParameterExcludes */);
+                }
+            }
+            else if (node.parent.kind === 172 /* InferType */) {
+                var container_2 = getInferTypeContainer(node.parent);
+                if (container_2) {
+                    if (!container_2.locals) {
+                        container_2.locals = ts.createSymbolTable();
+                    }
+                    declareSymbol(container_2.locals, /*parent*/ undefined, node, 262144 /* TypeParameter */, 67639784 /* TypeParameterExcludes */);
+                }
+                else {
+                    bindAnonymousDeclaration(node, 262144 /* TypeParameter */, getDeclarationName(node)); // TODO: GH#18217
+                }
+            }
+            else {
+                declareSymbolAndAddToSymbolTable(node, 262144 /* TypeParameter */, 67639784 /* TypeParameterExcludes */);
+            }
+        }
+        // reachability checks
+        function shouldReportErrorOnModuleDeclaration(node) {
+            var instanceState = getModuleInstanceState(node);
+            return instanceState === 1 /* Instantiated */ || (instanceState === 2 /* ConstEnumOnly */ && !!options.preserveConstEnums);
+        }
+        function checkUnreachable(node) {
+            if (!(currentFlow.flags & 1 /* Unreachable */)) {
+                return false;
+            }
+            if (currentFlow === unreachableFlow) {
+                var reportError = 
+                // report error on all statements except empty ones
+                (ts.isStatementButNotDeclaration(node) && node.kind !== 215 /* EmptyStatement */) ||
+                    // report error on class declarations
+                    node.kind === 235 /* ClassDeclaration */ ||
+                    // report error on instantiated modules or const-enums only modules if preserveConstEnums is set
+                    (node.kind === 239 /* ModuleDeclaration */ && shouldReportErrorOnModuleDeclaration(node)) ||
+                    // report error on regular enums and const enums if preserveConstEnums is set
+                    (node.kind === 238 /* EnumDeclaration */ && (!ts.isConstEnumDeclaration(node) || options.preserveConstEnums));
+                if (reportError) {
+                    currentFlow = reportedUnreachableFlow;
+                    if (!options.allowUnreachableCode) {
+                        // unreachable code is reported if
+                        // - user has explicitly asked about it AND
+                        // - statement is in not ambient context (statements in ambient context is already an error
+                        //   so we should not report extras) AND
+                        //   - node is not variable statement OR
+                        //   - node is block scoped variable statement OR
+                        //   - node is not block scoped variable statement and at least one variable declaration has initializer
+                        //   Rationale: we don't want to report errors on non-initialized var's since they are hoisted
+                        //   On the other side we do want to report errors on non-initialized 'lets' because of TDZ
+                        var isError = ts.unreachableCodeIsError(options) &&
+                            !(node.flags & 4194304 /* Ambient */) &&
+                            (!ts.isVariableStatement(node) ||
+                                !!(ts.getCombinedNodeFlags(node.declarationList) & 3 /* BlockScoped */) ||
+                                node.declarationList.declarations.some(function (d) { return !!d.initializer; }));
+                        errorOrSuggestionOnFirstToken(isError, node, ts.Diagnostics.Unreachable_code_detected);
+                    }
+                }
+            }
+            return true;
+        }
+    }
+    /* @internal */
+    function isExportsOrModuleExportsOrAlias(sourceFile, node) {
+        return ts.isExportsIdentifier(node) ||
+            ts.isModuleExportsPropertyAccessExpression(node) ||
+            ts.isIdentifier(node) && isNameOfExportsOrModuleExportsAliasDeclaration(sourceFile, node);
+    }
+    ts.isExportsOrModuleExportsOrAlias = isExportsOrModuleExportsOrAlias;
+    function isNameOfExportsOrModuleExportsAliasDeclaration(sourceFile, node) {
+        var symbol = lookupSymbolForNameWorker(sourceFile, node.escapedText);
+        return !!symbol && !!symbol.valueDeclaration && ts.isVariableDeclaration(symbol.valueDeclaration) &&
+            !!symbol.valueDeclaration.initializer && isExportsOrModuleExportsOrAliasOrAssignment(sourceFile, symbol.valueDeclaration.initializer);
+    }
+    function isExportsOrModuleExportsOrAliasOrAssignment(sourceFile, node) {
+        return isExportsOrModuleExportsOrAlias(sourceFile, node) ||
+            (ts.isAssignmentExpression(node, /*excludeCompoundAssignment*/ true) && (isExportsOrModuleExportsOrAliasOrAssignment(sourceFile, node.left) || isExportsOrModuleExportsOrAliasOrAssignment(sourceFile, node.right)));
+    }
+    function lookupSymbolForNameWorker(container, name) {
+        var local = container.locals && container.locals.get(name);
+        if (local) {
+            return local.exportSymbol || local;
+        }
+        return container.symbol && container.symbol.exports && container.symbol.exports.get(name);
+    }
+    /**
+     * Computes the transform flags for a node, given the transform flags of its subtree
+     *
+     * @param node The node to analyze
+     * @param subtreeFlags Transform flags computed for this node's subtree
+     */
+    function computeTransformFlagsForNode(node, subtreeFlags) {
+        var kind = node.kind;
+        switch (kind) {
+            case 187 /* CallExpression */:
+                return computeCallExpression(node, subtreeFlags);
+            case 188 /* NewExpression */:
+                return computeNewExpression(node, subtreeFlags);
+            case 239 /* ModuleDeclaration */:
+                return computeModuleDeclaration(node, subtreeFlags);
+            case 191 /* ParenthesizedExpression */:
+                return computeParenthesizedExpression(node, subtreeFlags);
+            case 200 /* BinaryExpression */:
+                return computeBinaryExpression(node, subtreeFlags);
+            case 216 /* ExpressionStatement */:
+                return computeExpressionStatement(node, subtreeFlags);
+            case 149 /* Parameter */:
+                return computeParameter(node, subtreeFlags);
+            case 193 /* ArrowFunction */:
+                return computeArrowFunction(node, subtreeFlags);
+            case 192 /* FunctionExpression */:
+                return computeFunctionExpression(node, subtreeFlags);
+            case 234 /* FunctionDeclaration */:
+                return computeFunctionDeclaration(node, subtreeFlags);
+            case 232 /* VariableDeclaration */:
+                return computeVariableDeclaration(node, subtreeFlags);
+            case 233 /* VariableDeclarationList */:
+                return computeVariableDeclarationList(node, subtreeFlags);
+            case 214 /* VariableStatement */:
+                return computeVariableStatement(node, subtreeFlags);
+            case 228 /* LabeledStatement */:
+                return computeLabeledStatement(node, subtreeFlags);
+            case 235 /* ClassDeclaration */:
+                return computeClassDeclaration(node, subtreeFlags);
+            case 205 /* ClassExpression */:
+                return computeClassExpression(node, subtreeFlags);
+            case 268 /* HeritageClause */:
+                return computeHeritageClause(node, subtreeFlags);
+            case 269 /* CatchClause */:
+                return computeCatchClause(node, subtreeFlags);
+            case 207 /* ExpressionWithTypeArguments */:
+                return computeExpressionWithTypeArguments(node, subtreeFlags);
+            case 155 /* Constructor */:
+                return computeConstructor(node, subtreeFlags);
+            case 152 /* PropertyDeclaration */:
+                return computePropertyDeclaration(node, subtreeFlags);
+            case 154 /* MethodDeclaration */:
+                return computeMethod(node, subtreeFlags);
+            case 156 /* GetAccessor */:
+            case 157 /* SetAccessor */:
+                return computeAccessor(node, subtreeFlags);
+            case 243 /* ImportEqualsDeclaration */:
+                return computeImportEquals(node, subtreeFlags);
+            case 185 /* PropertyAccessExpression */:
+                return computePropertyAccess(node, subtreeFlags);
+            case 186 /* ElementAccessExpression */:
+                return computeElementAccess(node, subtreeFlags);
+            default:
+                return computeOther(node, kind, subtreeFlags);
+        }
+    }
+    ts.computeTransformFlagsForNode = computeTransformFlagsForNode;
+    function computeCallExpression(node, subtreeFlags) {
+        var transformFlags = subtreeFlags;
+        var expression = node.expression;
+        if (node.typeArguments) {
+            transformFlags |= 3 /* AssertTypeScript */;
+        }
+        if (subtreeFlags & 524288 /* ContainsSpread */
+            || (expression.transformFlags & (134217728 /* Super */ | 268435456 /* ContainsSuper */))) {
+            // If the this node contains a SpreadExpression, or is a super call, then it is an ES6
+            // node.
+            transformFlags |= 192 /* AssertES2015 */;
+            // super property or element accesses could be inside lambdas, etc, and need a captured `this`,
+            // while super keyword for super calls (indicated by TransformFlags.Super) does not (since it can only be top-level in a constructor)
+            if (expression.transformFlags & 268435456 /* ContainsSuper */) {
+                transformFlags |= 16384 /* ContainsLexicalThis */;
+            }
+        }
+        if (expression.kind === 91 /* ImportKeyword */) {
+            transformFlags |= 67108864 /* ContainsDynamicImport */;
+            // A dynamic 'import()' call that contains a lexical 'this' will
+            // require a captured 'this' when emitting down-level.
+            if (subtreeFlags & 16384 /* ContainsLexicalThis */) {
+                transformFlags |= 32768 /* ContainsCapturedLexicalThis */;
+            }
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~940049729 /* ArrayLiteralOrCallOrNewExcludes */;
+    }
+    function computeNewExpression(node, subtreeFlags) {
+        var transformFlags = subtreeFlags;
+        if (node.typeArguments) {
+            transformFlags |= 3 /* AssertTypeScript */;
+        }
+        if (subtreeFlags & 524288 /* ContainsSpread */) {
+            // If the this node contains a SpreadElementExpression then it is an ES6
+            // node.
+            transformFlags |= 192 /* AssertES2015 */;
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~940049729 /* ArrayLiteralOrCallOrNewExcludes */;
+    }
+    function computeBinaryExpression(node, subtreeFlags) {
+        var transformFlags = subtreeFlags;
+        var operatorTokenKind = node.operatorToken.kind;
+        var leftKind = node.left.kind;
+        if (operatorTokenKind === 58 /* EqualsToken */ && leftKind === 184 /* ObjectLiteralExpression */) {
+            // Destructuring object assignments with are ES2015 syntax
+            // and possibly ESNext if they contain rest
+            transformFlags |= 8 /* AssertESNext */ | 192 /* AssertES2015 */ | 3072 /* AssertDestructuringAssignment */;
+        }
+        else if (operatorTokenKind === 58 /* EqualsToken */ && leftKind === 183 /* ArrayLiteralExpression */) {
+            // Destructuring assignments are ES2015 syntax.
+            transformFlags |= 192 /* AssertES2015 */ | 3072 /* AssertDestructuringAssignment */;
+        }
+        else if (operatorTokenKind === 40 /* AsteriskAsteriskToken */
+            || operatorTokenKind === 62 /* AsteriskAsteriskEqualsToken */) {
+            // Exponentiation is ES2016 syntax.
+            transformFlags |= 32 /* AssertES2016 */;
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~939525441 /* NodeExcludes */;
+    }
+    function computeParameter(node, subtreeFlags) {
+        var transformFlags = subtreeFlags;
+        var name = node.name;
+        var initializer = node.initializer;
+        var dotDotDotToken = node.dotDotDotToken;
+        // The '?' token, type annotations, decorators, and 'this' parameters are TypeSCript
+        // syntax.
+        if (node.questionToken
+            || node.type
+            || subtreeFlags & 4096 /* ContainsDecorators */
+            || ts.isThisIdentifier(name)) {
+            transformFlags |= 3 /* AssertTypeScript */;
+        }
+        // If a parameter has an accessibility modifier, then it is TypeScript syntax.
+        if (ts.hasModifier(node, 92 /* ParameterPropertyModifier */)) {
+            transformFlags |= 3 /* AssertTypeScript */ | 262144 /* ContainsParameterPropertyAssignments */;
+        }
+        // parameters with object rest destructuring are ES Next syntax
+        if (subtreeFlags & 1048576 /* ContainsObjectRest */) {
+            transformFlags |= 8 /* AssertESNext */;
+        }
+        // If a parameter has an initializer, a binding pattern or a dotDotDot token, then
+        // it is ES6 syntax and its container must emit default value assignments or parameter destructuring downlevel.
+        if (subtreeFlags & 8388608 /* ContainsBindingPattern */ || initializer || dotDotDotToken) {
+            transformFlags |= 192 /* AssertES2015 */ | 131072 /* ContainsDefaultValueAssignments */;
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~939525441 /* ParameterExcludes */;
+    }
+    function computeParenthesizedExpression(node, subtreeFlags) {
+        var transformFlags = subtreeFlags;
+        var expression = node.expression;
+        var expressionKind = expression.kind;
+        var expressionTransformFlags = expression.transformFlags;
+        // If the node is synthesized, it means the emitter put the parentheses there,
+        // not the user. If we didn't want them, the emitter would not have put them
+        // there.
+        if (expressionKind === 208 /* AsExpression */
+            || expressionKind === 190 /* TypeAssertionExpression */) {
+            transformFlags |= 3 /* AssertTypeScript */;
+        }
+        // If the expression of a ParenthesizedExpression is a destructuring assignment,
+        // then the ParenthesizedExpression is a destructuring assignment.
+        if (expressionTransformFlags & 1024 /* DestructuringAssignment */) {
+            transformFlags |= 1024 /* DestructuringAssignment */;
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~536872257 /* OuterExpressionExcludes */;
+    }
+    function computeClassDeclaration(node, subtreeFlags) {
+        var transformFlags;
+        if (ts.hasModifier(node, 2 /* Ambient */)) {
+            // An ambient declaration is TypeScript syntax.
+            transformFlags = 3 /* AssertTypeScript */;
+        }
+        else {
+            // A ClassDeclaration is ES6 syntax.
+            transformFlags = subtreeFlags | 192 /* AssertES2015 */;
+            // A class with a parameter property assignment, property initializer, computed property name, or decorator is
+            // TypeScript syntax.
+            // An exported declaration may be TypeScript syntax, but is handled by the visitor
+            // for a namespace declaration.
+            if ((subtreeFlags & 274432 /* TypeScriptClassSyntaxMask */)
+                || node.typeParameters) {
+                transformFlags |= 3 /* AssertTypeScript */;
+            }
+            if (subtreeFlags & 65536 /* ContainsLexicalThisInComputedPropertyName */) {
+                // A computed property name containing `this` might need to be rewritten,
+                // so propagate the ContainsLexicalThis flag upward.
+                transformFlags |= 16384 /* ContainsLexicalThis */;
+            }
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~942011713 /* ClassExcludes */;
+    }
+    function computeClassExpression(node, subtreeFlags) {
+        // A ClassExpression is ES6 syntax.
+        var transformFlags = subtreeFlags | 192 /* AssertES2015 */;
+        // A class with a parameter property assignment, property initializer, or decorator is
+        // TypeScript syntax.
+        if (subtreeFlags & 274432 /* TypeScriptClassSyntaxMask */
+            || node.typeParameters) {
+            transformFlags |= 3 /* AssertTypeScript */;
+        }
+        if (subtreeFlags & 65536 /* ContainsLexicalThisInComputedPropertyName */) {
+            // A computed property name containing `this` might need to be rewritten,
+            // so propagate the ContainsLexicalThis flag upward.
+            transformFlags |= 16384 /* ContainsLexicalThis */;
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~942011713 /* ClassExcludes */;
+    }
+    function computeHeritageClause(node, subtreeFlags) {
+        var transformFlags = subtreeFlags;
+        switch (node.token) {
+            case 85 /* ExtendsKeyword */:
+                // An `extends` HeritageClause is ES6 syntax.
+                transformFlags |= 192 /* AssertES2015 */;
+                break;
+            case 108 /* ImplementsKeyword */:
+                // An `implements` HeritageClause is TypeScript syntax.
+                transformFlags |= 3 /* AssertTypeScript */;
+                break;
+            default:
+                ts.Debug.fail("Unexpected token for heritage clause");
+                break;
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~939525441 /* NodeExcludes */;
+    }
+    function computeCatchClause(node, subtreeFlags) {
+        var transformFlags = subtreeFlags;
+        if (!node.variableDeclaration) {
+            transformFlags |= 8 /* AssertESNext */;
+        }
+        else if (ts.isBindingPattern(node.variableDeclaration.name)) {
+            transformFlags |= 192 /* AssertES2015 */;
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~940574017 /* CatchClauseExcludes */;
+    }
+    function computeExpressionWithTypeArguments(node, subtreeFlags) {
+        // An ExpressionWithTypeArguments is ES6 syntax, as it is used in the
+        // extends clause of a class.
+        var transformFlags = subtreeFlags | 192 /* AssertES2015 */;
+        // If an ExpressionWithTypeArguments contains type arguments, then it
+        // is TypeScript syntax.
+        if (node.typeArguments) {
+            transformFlags |= 3 /* AssertTypeScript */;
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~939525441 /* NodeExcludes */;
+    }
+    function computeConstructor(node, subtreeFlags) {
+        var transformFlags = subtreeFlags;
+        // TypeScript-specific modifiers and overloads are TypeScript syntax
+        if (ts.hasModifier(node, 2270 /* TypeScriptModifier */)
+            || !node.body) {
+            transformFlags |= 3 /* AssertTypeScript */;
+        }
+        // function declarations with object rest destructuring are ES Next syntax
+        if (subtreeFlags & 1048576 /* ContainsObjectRest */) {
+            transformFlags |= 8 /* AssertESNext */;
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~1003668801 /* ConstructorExcludes */;
+    }
+    function computeMethod(node, subtreeFlags) {
+        // A MethodDeclaration is ES6 syntax.
+        var transformFlags = subtreeFlags | 192 /* AssertES2015 */;
+        // Decorators, TypeScript-specific modifiers, type parameters, type annotations, and
+        // overloads are TypeScript syntax.
+        if (node.decorators
+            || ts.hasModifier(node, 2270 /* TypeScriptModifier */)
+            || node.typeParameters
+            || node.type
+            || (node.name && ts.isComputedPropertyName(node.name)) // While computed method names aren't typescript, the TS transform must visit them to emit property declarations correctly
+            || !node.body) {
+            transformFlags |= 3 /* AssertTypeScript */;
+        }
+        // function declarations with object rest destructuring are ES Next syntax
+        if (subtreeFlags & 1048576 /* ContainsObjectRest */) {
+            transformFlags |= 8 /* AssertESNext */;
+        }
+        // An async method declaration is ES2017 syntax.
+        if (ts.hasModifier(node, 256 /* Async */)) {
+            transformFlags |= node.asteriskToken ? 8 /* AssertESNext */ : 16 /* AssertES2017 */;
+        }
+        if (node.asteriskToken) {
+            transformFlags |= 768 /* AssertGenerator */;
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~1003668801 /* MethodOrAccessorExcludes */;
+    }
+    function computeAccessor(node, subtreeFlags) {
+        var transformFlags = subtreeFlags;
+        // Decorators, TypeScript-specific modifiers, type annotations, and overloads are
+        // TypeScript syntax.
+        if (node.decorators
+            || ts.hasModifier(node, 2270 /* TypeScriptModifier */)
+            || node.type
+            || (node.name && ts.isComputedPropertyName(node.name)) // While computed accessor names aren't typescript, the TS transform must visit them to emit property declarations correctly
+            || !node.body) {
+            transformFlags |= 3 /* AssertTypeScript */;
+        }
+        // function declarations with object rest destructuring are ES Next syntax
+        if (subtreeFlags & 1048576 /* ContainsObjectRest */) {
+            transformFlags |= 8 /* AssertESNext */;
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~1003668801 /* MethodOrAccessorExcludes */;
+    }
+    function computePropertyDeclaration(node, subtreeFlags) {
+        // A PropertyDeclaration is TypeScript syntax.
+        var transformFlags = subtreeFlags | 3 /* AssertTypeScript */;
+        // If the PropertyDeclaration has an initializer or a computed name, we need to inform its ancestor
+        // so that it handle the transformation.
+        if (node.initializer || ts.isComputedPropertyName(node.name)) {
+            transformFlags |= 8192 /* ContainsPropertyInitializer */;
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~939525441 /* NodeExcludes */;
+    }
+    function computeFunctionDeclaration(node, subtreeFlags) {
+        var transformFlags;
+        var modifierFlags = ts.getModifierFlags(node);
+        var body = node.body;
+        if (!body || (modifierFlags & 2 /* Ambient */)) {
+            // An ambient declaration is TypeScript syntax.
+            // A FunctionDeclaration without a body is an overload and is TypeScript syntax.
+            transformFlags = 3 /* AssertTypeScript */;
+        }
+        else {
+            transformFlags = subtreeFlags | 33554432 /* ContainsHoistedDeclarationOrCompletion */;
+            // TypeScript-specific modifiers, type parameters, and type annotations are TypeScript
+            // syntax.
+            if (modifierFlags & 2270 /* TypeScriptModifier */
+                || node.typeParameters
+                || node.type) {
+                transformFlags |= 3 /* AssertTypeScript */;
+            }
+            // An async function declaration is ES2017 syntax.
+            if (modifierFlags & 256 /* Async */) {
+                transformFlags |= node.asteriskToken ? 8 /* AssertESNext */ : 16 /* AssertES2017 */;
+            }
+            // function declarations with object rest destructuring are ES Next syntax
+            if (subtreeFlags & 1048576 /* ContainsObjectRest */) {
+                transformFlags |= 8 /* AssertESNext */;
+            }
+            // If a FunctionDeclaration's subtree has marked the container as needing to capture the
+            // lexical this, or the function contains parameters with initializers, then this node is
+            // ES6 syntax.
+            if (subtreeFlags & 163840 /* ES2015FunctionSyntaxMask */) {
+                transformFlags |= 192 /* AssertES2015 */;
+            }
+            // If a FunctionDeclaration is generator function and is the body of a
+            // transformed async function, then this node can be transformed to a
+            // down-level generator.
+            // Currently we do not support transforming any other generator fucntions
+            // down level.
+            if (node.asteriskToken) {
+                transformFlags |= 768 /* AssertGenerator */;
+            }
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~1003935041 /* FunctionExcludes */;
+    }
+    function computeFunctionExpression(node, subtreeFlags) {
+        var transformFlags = subtreeFlags;
+        // TypeScript-specific modifiers, type parameters, and type annotations are TypeScript
+        // syntax.
+        if (ts.hasModifier(node, 2270 /* TypeScriptModifier */)
+            || node.typeParameters
+            || node.type) {
+            transformFlags |= 3 /* AssertTypeScript */;
+        }
+        // An async function expression is ES2017 syntax.
+        if (ts.hasModifier(node, 256 /* Async */)) {
+            transformFlags |= node.asteriskToken ? 8 /* AssertESNext */ : 16 /* AssertES2017 */;
+        }
+        // function expressions with object rest destructuring are ES Next syntax
+        if (subtreeFlags & 1048576 /* ContainsObjectRest */) {
+            transformFlags |= 8 /* AssertESNext */;
+        }
+        // If a FunctionExpression's subtree has marked the container as needing to capture the
+        // lexical this, or the function contains parameters with initializers, then this node is
+        // ES6 syntax.
+        if (subtreeFlags & 163840 /* ES2015FunctionSyntaxMask */) {
+            transformFlags |= 192 /* AssertES2015 */;
+        }
+        // If a FunctionExpression is generator function and is the body of a
+        // transformed async function, then this node can be transformed to a
+        // down-level generator.
+        if (node.asteriskToken) {
+            transformFlags |= 768 /* AssertGenerator */;
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~1003935041 /* FunctionExcludes */;
+    }
+    function computeArrowFunction(node, subtreeFlags) {
+        // An ArrowFunction is ES6 syntax, and excludes markers that should not escape the scope of an ArrowFunction.
+        var transformFlags = subtreeFlags | 192 /* AssertES2015 */;
+        // TypeScript-specific modifiers, type parameters, and type annotations are TypeScript
+        // syntax.
+        if (ts.hasModifier(node, 2270 /* TypeScriptModifier */)
+            || node.typeParameters
+            || node.type) {
+            transformFlags |= 3 /* AssertTypeScript */;
+        }
+        // An async arrow function is ES2017 syntax.
+        if (ts.hasModifier(node, 256 /* Async */)) {
+            transformFlags |= 16 /* AssertES2017 */;
+        }
+        // arrow functions with object rest destructuring are ES Next syntax
+        if (subtreeFlags & 1048576 /* ContainsObjectRest */) {
+            transformFlags |= 8 /* AssertESNext */;
+        }
+        // If an ArrowFunction contains a lexical this, its container must capture the lexical this.
+        if (subtreeFlags & 16384 /* ContainsLexicalThis */) {
+            transformFlags |= 32768 /* ContainsCapturedLexicalThis */;
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~1003902273 /* ArrowFunctionExcludes */;
+    }
+    function computePropertyAccess(node, subtreeFlags) {
+        var transformFlags = subtreeFlags;
+        // If a PropertyAccessExpression starts with a super keyword, then it is
+        // ES6 syntax, and requires a lexical `this` binding.
+        if (transformFlags & 134217728 /* Super */) {
+            transformFlags ^= 134217728 /* Super */;
+            transformFlags |= 268435456 /* ContainsSuper */;
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~671089985 /* PropertyAccessExcludes */;
+    }
+    function computeElementAccess(node, subtreeFlags) {
+        var transformFlags = subtreeFlags;
+        var expression = node.expression;
+        var expressionFlags = expression.transformFlags; // We do not want to aggregate flags from the argument expression for super/this capturing
+        // If an ElementAccessExpression starts with a super keyword, then it is
+        // ES6 syntax, and requires a lexical `this` binding.
+        if (expressionFlags & 134217728 /* Super */) {
+            transformFlags &= ~134217728 /* Super */;
+            transformFlags |= 268435456 /* ContainsSuper */;
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~671089985 /* PropertyAccessExcludes */;
+    }
+    function computeVariableDeclaration(node, subtreeFlags) {
+        var transformFlags = subtreeFlags;
+        transformFlags |= 192 /* AssertES2015 */ | 8388608 /* ContainsBindingPattern */;
+        // A VariableDeclaration containing ObjectRest is ESNext syntax
+        if (subtreeFlags & 1048576 /* ContainsObjectRest */) {
+            transformFlags |= 8 /* AssertESNext */;
+        }
+        // Type annotations are TypeScript syntax.
+        if (node.type) {
+            transformFlags |= 3 /* AssertTypeScript */;
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~939525441 /* NodeExcludes */;
+    }
+    function computeVariableStatement(node, subtreeFlags) {
+        var transformFlags;
+        var declarationListTransformFlags = node.declarationList.transformFlags;
+        // An ambient declaration is TypeScript syntax.
+        if (ts.hasModifier(node, 2 /* Ambient */)) {
+            transformFlags = 3 /* AssertTypeScript */;
+        }
+        else {
+            transformFlags = subtreeFlags;
+            if (declarationListTransformFlags & 8388608 /* ContainsBindingPattern */) {
+                transformFlags |= 192 /* AssertES2015 */;
+            }
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~939525441 /* NodeExcludes */;
+    }
+    function computeLabeledStatement(node, subtreeFlags) {
+        var transformFlags = subtreeFlags;
+        // A labeled statement containing a block scoped binding *may* need to be transformed from ES6.
+        if (subtreeFlags & 4194304 /* ContainsBlockScopedBinding */
+            && ts.isIterationStatement(node, /*lookInLabeledStatements*/ true)) {
+            transformFlags |= 192 /* AssertES2015 */;
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~939525441 /* NodeExcludes */;
+    }
+    function computeImportEquals(node, subtreeFlags) {
+        var transformFlags = subtreeFlags;
+        // An ImportEqualsDeclaration with a namespace reference is TypeScript.
+        if (!ts.isExternalModuleImportEqualsDeclaration(node)) {
+            transformFlags |= 3 /* AssertTypeScript */;
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~939525441 /* NodeExcludes */;
+    }
+    function computeExpressionStatement(node, subtreeFlags) {
+        var transformFlags = subtreeFlags;
+        // If the expression of an expression statement is a destructuring assignment,
+        // then we treat the statement as ES6 so that we can indicate that we do not
+        // need to hold on to the right-hand side.
+        if (node.expression.transformFlags & 1024 /* DestructuringAssignment */) {
+            transformFlags |= 192 /* AssertES2015 */;
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~939525441 /* NodeExcludes */;
+    }
+    function computeModuleDeclaration(node, subtreeFlags) {
+        var transformFlags = 3 /* AssertTypeScript */;
+        var modifierFlags = ts.getModifierFlags(node);
+        if ((modifierFlags & 2 /* Ambient */) === 0) {
+            transformFlags |= subtreeFlags;
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~977327425 /* ModuleExcludes */;
+    }
+    function computeVariableDeclarationList(node, subtreeFlags) {
+        var transformFlags = subtreeFlags | 33554432 /* ContainsHoistedDeclarationOrCompletion */;
+        if (subtreeFlags & 8388608 /* ContainsBindingPattern */) {
+            transformFlags |= 192 /* AssertES2015 */;
+        }
+        // If a VariableDeclarationList is `let` or `const`, then it is ES6 syntax.
+        if (node.flags & 3 /* BlockScoped */) {
+            transformFlags |= 192 /* AssertES2015 */ | 4194304 /* ContainsBlockScopedBinding */;
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~948962625 /* VariableDeclarationListExcludes */;
+    }
+    function computeOther(node, kind, subtreeFlags) {
+        // Mark transformations needed for each node
+        var transformFlags = subtreeFlags;
+        var excludeFlags = 939525441 /* NodeExcludes */;
+        switch (kind) {
+            case 120 /* AsyncKeyword */:
+            case 197 /* AwaitExpression */:
+                // async/await is ES2017 syntax, but may be ESNext syntax (for async generators)
+                transformFlags |= 8 /* AssertESNext */ | 16 /* AssertES2017 */;
+                break;
+            case 190 /* TypeAssertionExpression */:
+            case 208 /* AsExpression */:
+            case 301 /* PartiallyEmittedExpression */:
+                // These nodes are TypeScript syntax.
+                transformFlags |= 3 /* AssertTypeScript */;
+                excludeFlags = 536872257 /* OuterExpressionExcludes */;
+                break;
+            case 114 /* PublicKeyword */:
+            case 112 /* PrivateKeyword */:
+            case 113 /* ProtectedKeyword */:
+            case 117 /* AbstractKeyword */:
+            case 124 /* DeclareKeyword */:
+            case 76 /* ConstKeyword */:
+            case 238 /* EnumDeclaration */:
+            case 273 /* EnumMember */:
+            case 209 /* NonNullExpression */:
+            case 132 /* ReadonlyKeyword */:
+                // These nodes are TypeScript syntax.
+                transformFlags |= 3 /* AssertTypeScript */;
+                break;
+            case 255 /* JsxElement */:
+            case 256 /* JsxSelfClosingElement */:
+            case 257 /* JsxOpeningElement */:
+            case 10 /* JsxText */:
+            case 258 /* JsxClosingElement */:
+            case 259 /* JsxFragment */:
+            case 260 /* JsxOpeningFragment */:
+            case 261 /* JsxClosingFragment */:
+            case 262 /* JsxAttribute */:
+            case 263 /* JsxAttributes */:
+            case 264 /* JsxSpreadAttribute */:
+            case 265 /* JsxExpression */:
+                // These nodes are Jsx syntax.
+                transformFlags |= 4 /* AssertJsx */;
+                break;
+            case 13 /* NoSubstitutionTemplateLiteral */:
+            case 14 /* TemplateHead */:
+            case 15 /* TemplateMiddle */:
+            case 16 /* TemplateTail */:
+            case 202 /* TemplateExpression */:
+            case 189 /* TaggedTemplateExpression */:
+            case 271 /* ShorthandPropertyAssignment */:
+            case 115 /* StaticKeyword */:
+            case 210 /* MetaProperty */:
+                // These nodes are ES6 syntax.
+                transformFlags |= 192 /* AssertES2015 */;
+                break;
+            case 9 /* StringLiteral */:
+                if (node.hasExtendedUnicodeEscape) {
+                    transformFlags |= 192 /* AssertES2015 */;
+                }
+                break;
+            case 8 /* NumericLiteral */:
+                if (node.numericLiteralFlags & 384 /* BinaryOrOctalSpecifier */) {
+                    transformFlags |= 192 /* AssertES2015 */;
+                }
+                break;
+            case 222 /* ForOfStatement */:
+                // This node is either ES2015 syntax or ES2017 syntax (if it is a for-await-of).
+                if (node.awaitModifier) {
+                    transformFlags |= 8 /* AssertESNext */;
+                }
+                transformFlags |= 192 /* AssertES2015 */;
+                break;
+            case 203 /* YieldExpression */:
+                // This node is either ES2015 syntax (in a generator) or ES2017 syntax (in an async
+                // generator).
+                transformFlags |= 8 /* AssertESNext */ | 192 /* AssertES2015 */ | 16777216 /* ContainsYield */;
+                break;
+            case 119 /* AnyKeyword */:
+            case 134 /* NumberKeyword */:
+            case 131 /* NeverKeyword */:
+            case 135 /* ObjectKeyword */:
+            case 137 /* StringKeyword */:
+            case 122 /* BooleanKeyword */:
+            case 138 /* SymbolKeyword */:
+            case 105 /* VoidKeyword */:
+            case 148 /* TypeParameter */:
+            case 151 /* PropertySignature */:
+            case 153 /* MethodSignature */:
+            case 158 /* CallSignature */:
+            case 159 /* ConstructSignature */:
+            case 160 /* IndexSignature */:
+            case 161 /* TypePredicate */:
+            case 162 /* TypeReference */:
+            case 163 /* FunctionType */:
+            case 164 /* ConstructorType */:
+            case 165 /* TypeQuery */:
+            case 166 /* TypeLiteral */:
+            case 167 /* ArrayType */:
+            case 168 /* TupleType */:
+            case 169 /* UnionType */:
+            case 170 /* IntersectionType */:
+            case 171 /* ConditionalType */:
+            case 172 /* InferType */:
+            case 173 /* ParenthesizedType */:
+            case 236 /* InterfaceDeclaration */:
+            case 237 /* TypeAliasDeclaration */:
+            case 174 /* ThisType */:
+            case 175 /* TypeOperator */:
+            case 176 /* IndexedAccessType */:
+            case 177 /* MappedType */:
+            case 178 /* LiteralType */:
+            case 242 /* NamespaceExportDeclaration */:
+                // Types and signatures are TypeScript syntax, and exclude all other facts.
+                transformFlags = 3 /* AssertTypeScript */;
+                excludeFlags = -3 /* TypeExcludes */;
+                break;
+            case 147 /* ComputedPropertyName */:
+                // Even though computed property names are ES6, we don't treat them as such.
+                // This is so that they can flow through PropertyName transforms unaffected.
+                // Instead, we mark the container as ES6, so that it can properly handle the transform.
+                transformFlags |= 2097152 /* ContainsComputedPropertyName */;
+                if (subtreeFlags & 16384 /* ContainsLexicalThis */) {
+                    // A computed method name like `[this.getName()](x: string) { ... }` needs to
+                    // distinguish itself from the normal case of a method body containing `this`:
+                    // `this` inside a method doesn't need to be rewritten (the method provides `this`),
+                    // whereas `this` inside a computed name *might* need to be rewritten if the class/object
+                    // is inside an arrow function:
+                    // `_this = this; () => class K { [_this.getName()]() { ... } }`
+                    // To make this distinction, use ContainsLexicalThisInComputedPropertyName
+                    // instead of ContainsLexicalThis for computed property names
+                    transformFlags |= 65536 /* ContainsLexicalThisInComputedPropertyName */;
+                }
+                break;
+            case 204 /* SpreadElement */:
+                transformFlags |= 192 /* AssertES2015 */ | 524288 /* ContainsSpread */;
+                break;
+            case 272 /* SpreadAssignment */:
+                transformFlags |= 8 /* AssertESNext */ | 1048576 /* ContainsObjectSpread */;
+                break;
+            case 97 /* SuperKeyword */:
+                // This node is ES6 syntax.
+                transformFlags |= 192 /* AssertES2015 */ | 134217728 /* Super */;
+                excludeFlags = 536872257 /* OuterExpressionExcludes */; // must be set to persist `Super`
+                break;
+            case 99 /* ThisKeyword */:
+                // Mark this node and its ancestors as containing a lexical `this` keyword.
+                transformFlags |= 16384 /* ContainsLexicalThis */;
+                break;
+            case 180 /* ObjectBindingPattern */:
+                transformFlags |= 192 /* AssertES2015 */ | 8388608 /* ContainsBindingPattern */;
+                if (subtreeFlags & 524288 /* ContainsRest */) {
+                    transformFlags |= 8 /* AssertESNext */ | 1048576 /* ContainsObjectRest */;
+                }
+                excludeFlags = 940049729 /* BindingPatternExcludes */;
+                break;
+            case 181 /* ArrayBindingPattern */:
+                transformFlags |= 192 /* AssertES2015 */ | 8388608 /* ContainsBindingPattern */;
+                excludeFlags = 940049729 /* BindingPatternExcludes */;
+                break;
+            case 182 /* BindingElement */:
+                transformFlags |= 192 /* AssertES2015 */;
+                if (node.dotDotDotToken) {
+                    transformFlags |= 524288 /* ContainsRest */;
+                }
+                break;
+            case 150 /* Decorator */:
+                // This node is TypeScript syntax, and marks its container as also being TypeScript syntax.
+                transformFlags |= 3 /* AssertTypeScript */ | 4096 /* ContainsDecorators */;
+                break;
+            case 184 /* ObjectLiteralExpression */:
+                excludeFlags = 942740801 /* ObjectLiteralExcludes */;
+                if (subtreeFlags & 2097152 /* ContainsComputedPropertyName */) {
+                    // If an ObjectLiteralExpression contains a ComputedPropertyName, then it
+                    // is an ES6 node.
+                    transformFlags |= 192 /* AssertES2015 */;
+                }
+                if (subtreeFlags & 65536 /* ContainsLexicalThisInComputedPropertyName */) {
+                    // A computed property name containing `this` might need to be rewritten,
+                    // so propagate the ContainsLexicalThis flag upward.
+                    transformFlags |= 16384 /* ContainsLexicalThis */;
+                }
+                if (subtreeFlags & 1048576 /* ContainsObjectSpread */) {
+                    // If an ObjectLiteralExpression contains a spread element, then it
+                    // is an ES next node.
+                    transformFlags |= 8 /* AssertESNext */;
+                }
+                break;
+            case 183 /* ArrayLiteralExpression */:
+            case 188 /* NewExpression */:
+                excludeFlags = 940049729 /* ArrayLiteralOrCallOrNewExcludes */;
+                if (subtreeFlags & 524288 /* ContainsSpread */) {
+                    // If the this node contains a SpreadExpression, then it is an ES6
+                    // node.
+                    transformFlags |= 192 /* AssertES2015 */;
+                }
+                break;
+            case 218 /* DoStatement */:
+            case 219 /* WhileStatement */:
+            case 220 /* ForStatement */:
+            case 221 /* ForInStatement */:
+                // A loop containing a block scoped binding *may* need to be transformed from ES6.
+                if (subtreeFlags & 4194304 /* ContainsBlockScopedBinding */) {
+                    transformFlags |= 192 /* AssertES2015 */;
+                }
+                break;
+            case 274 /* SourceFile */:
+                if (subtreeFlags & 32768 /* ContainsCapturedLexicalThis */) {
+                    transformFlags |= 192 /* AssertES2015 */;
+                }
+                break;
+            case 225 /* ReturnStatement */:
+                // Return statements may require an `await` in ESNext.
+                transformFlags |= 33554432 /* ContainsHoistedDeclarationOrCompletion */ | 8 /* AssertESNext */;
+                break;
+            case 223 /* ContinueStatement */:
+            case 224 /* BreakStatement */:
+                transformFlags |= 33554432 /* ContainsHoistedDeclarationOrCompletion */;
+                break;
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~excludeFlags;
+    }
+    /**
+     * Gets the transform flags to exclude when unioning the transform flags of a subtree.
+     *
+     * NOTE: This needs to be kept up-to-date with the exclusions used in `computeTransformFlagsForNode`.
+     *       For performance reasons, `computeTransformFlagsForNode` uses local constant values rather
+     *       than calling this function.
+     */
+    /* @internal */
+    function getTransformFlagsSubtreeExclusions(kind) {
+        if (kind >= 161 /* FirstTypeNode */ && kind <= 179 /* LastTypeNode */) {
+            return -3 /* TypeExcludes */;
+        }
+        switch (kind) {
+            case 187 /* CallExpression */:
+            case 188 /* NewExpression */:
+            case 183 /* ArrayLiteralExpression */:
+                return 940049729 /* ArrayLiteralOrCallOrNewExcludes */;
+            case 239 /* ModuleDeclaration */:
+                return 977327425 /* ModuleExcludes */;
+            case 149 /* Parameter */:
+                return 939525441 /* ParameterExcludes */;
+            case 193 /* ArrowFunction */:
+                return 1003902273 /* ArrowFunctionExcludes */;
+            case 192 /* FunctionExpression */:
+            case 234 /* FunctionDeclaration */:
+                return 1003935041 /* FunctionExcludes */;
+            case 233 /* VariableDeclarationList */:
+                return 948962625 /* VariableDeclarationListExcludes */;
+            case 235 /* ClassDeclaration */:
+            case 205 /* ClassExpression */:
+                return 942011713 /* ClassExcludes */;
+            case 155 /* Constructor */:
+                return 1003668801 /* ConstructorExcludes */;
+            case 154 /* MethodDeclaration */:
+            case 156 /* GetAccessor */:
+            case 157 /* SetAccessor */:
+                return 1003668801 /* MethodOrAccessorExcludes */;
+            case 119 /* AnyKeyword */:
+            case 134 /* NumberKeyword */:
+            case 131 /* NeverKeyword */:
+            case 137 /* StringKeyword */:
+            case 135 /* ObjectKeyword */:
+            case 122 /* BooleanKeyword */:
+            case 138 /* SymbolKeyword */:
+            case 105 /* VoidKeyword */:
+            case 148 /* TypeParameter */:
+            case 151 /* PropertySignature */:
+            case 153 /* MethodSignature */:
+            case 158 /* CallSignature */:
+            case 159 /* ConstructSignature */:
+            case 160 /* IndexSignature */:
+            case 236 /* InterfaceDeclaration */:
+            case 237 /* TypeAliasDeclaration */:
+                return -3 /* TypeExcludes */;
+            case 184 /* ObjectLiteralExpression */:
+                return 942740801 /* ObjectLiteralExcludes */;
+            case 269 /* CatchClause */:
+                return 940574017 /* CatchClauseExcludes */;
+            case 180 /* ObjectBindingPattern */:
+            case 181 /* ArrayBindingPattern */:
+                return 940049729 /* BindingPatternExcludes */;
+            case 190 /* TypeAssertionExpression */:
+            case 208 /* AsExpression */:
+            case 301 /* PartiallyEmittedExpression */:
+            case 191 /* ParenthesizedExpression */:
+            case 97 /* SuperKeyword */:
+                return 536872257 /* OuterExpressionExcludes */;
+            case 185 /* PropertyAccessExpression */:
+            case 186 /* ElementAccessExpression */:
+                return 671089985 /* PropertyAccessExcludes */;
+            default:
+                return 939525441 /* NodeExcludes */;
+        }
+    }
+    ts.getTransformFlagsSubtreeExclusions = getTransformFlagsSubtreeExclusions;
+    /**
+     * "Binds" JSDoc nodes in TypeScript code.
+     * Since we will never create symbols for JSDoc, we just set parent pointers instead.
+     */
+    function setParentPointers(parent, child) {
+        child.parent = parent;
+        ts.forEachChild(child, function (grandchild) { return setParentPointers(child, grandchild); });
+    }
+})(ts || (ts = {}));
+/** @internal */
+var ts;
+(function (ts) {
+    function createGetSymbolWalker(getRestTypeOfSignature, getTypePredicateOfSignature, getReturnTypeOfSignature, getBaseTypes, resolveStructuredTypeMembers, getTypeOfSymbol, getResolvedSymbol, getIndexTypeOfStructuredType, getConstraintFromTypeParameter, getFirstIdentifier) {
+        return getSymbolWalker;
+        function getSymbolWalker(accept) {
+            if (accept === void 0) { accept = function () { return true; }; }
+            var visitedTypes = []; // Sparse array from id to type
+            var visitedSymbols = []; // Sparse array from id to symbol
+            return {
+                walkType: function (type) {
+                    try {
+                        visitType(type);
+                        return { visitedTypes: ts.getOwnValues(visitedTypes), visitedSymbols: ts.getOwnValues(visitedSymbols) };
+                    }
+                    finally {
+                        ts.clear(visitedTypes);
+                        ts.clear(visitedSymbols);
+                    }
+                },
+                walkSymbol: function (symbol) {
+                    try {
+                        visitSymbol(symbol);
+                        return { visitedTypes: ts.getOwnValues(visitedTypes), visitedSymbols: ts.getOwnValues(visitedSymbols) };
+                    }
+                    finally {
+                        ts.clear(visitedTypes);
+                        ts.clear(visitedSymbols);
+                    }
+                },
+            };
+            function visitType(type) {
+                if (!type) {
+                    return;
+                }
+                if (visitedTypes[type.id]) {
+                    return;
+                }
+                visitedTypes[type.id] = type;
+                // Reuse visitSymbol to visit the type's symbol,
+                //  but be sure to bail on recuring into the type if accept declines the symbol.
+                var shouldBail = visitSymbol(type.symbol);
+                if (shouldBail)
+                    return;
+                // Visit the type's related types, if any
+                if (type.flags & 131072 /* Object */) {
+                    var objectType = type;
+                    var objectFlags = objectType.objectFlags;
+                    if (objectFlags & 4 /* Reference */) {
+                        visitTypeReference(type);
+                    }
+                    if (objectFlags & 32 /* Mapped */) {
+                        visitMappedType(type);
+                    }
+                    if (objectFlags & (1 /* Class */ | 2 /* Interface */)) {
+                        visitInterfaceType(type);
+                    }
+                    if (objectFlags & (8 /* Tuple */ | 16 /* Anonymous */)) {
+                        visitObjectType(objectType);
+                    }
+                }
+                if (type.flags & 65536 /* TypeParameter */) {
+                    visitTypeParameter(type);
+                }
+                if (type.flags & 786432 /* UnionOrIntersection */) {
+                    visitUnionOrIntersectionType(type);
+                }
+                if (type.flags & 1048576 /* Index */) {
+                    visitIndexType(type);
+                }
+                if (type.flags & 2097152 /* IndexedAccess */) {
+                    visitIndexedAccessType(type);
+                }
+            }
+            function visitTypeReference(type) {
+                visitType(type.target);
+                ts.forEach(type.typeArguments, visitType);
+            }
+            function visitTypeParameter(type) {
+                visitType(getConstraintFromTypeParameter(type));
+            }
+            function visitUnionOrIntersectionType(type) {
+                ts.forEach(type.types, visitType);
+            }
+            function visitIndexType(type) {
+                visitType(type.type);
+            }
+            function visitIndexedAccessType(type) {
+                visitType(type.objectType);
+                visitType(type.indexType);
+                visitType(type.constraint);
+            }
+            function visitMappedType(type) {
+                visitType(type.typeParameter);
+                visitType(type.constraintType);
+                visitType(type.templateType);
+                visitType(type.modifiersType);
+            }
+            function visitSignature(signature) {
+                var typePredicate = getTypePredicateOfSignature(signature);
+                if (typePredicate) {
+                    visitType(typePredicate.type);
+                }
+                ts.forEach(signature.typeParameters, visitType);
+                for (var _i = 0, _a = signature.parameters; _i < _a.length; _i++) {
+                    var parameter = _a[_i];
+                    visitSymbol(parameter);
+                }
+                visitType(getRestTypeOfSignature(signature));
+                visitType(getReturnTypeOfSignature(signature));
+            }
+            function visitInterfaceType(interfaceT) {
+                visitObjectType(interfaceT);
+                ts.forEach(interfaceT.typeParameters, visitType);
+                ts.forEach(getBaseTypes(interfaceT), visitType);
+                visitType(interfaceT.thisType);
+            }
+            function visitObjectType(type) {
+                var stringIndexType = getIndexTypeOfStructuredType(type, 0 /* String */);
+                visitType(stringIndexType);
+                var numberIndexType = getIndexTypeOfStructuredType(type, 1 /* Number */);
+                visitType(numberIndexType);
+                // The two checks above *should* have already resolved the type (if needed), so this should be cached
+                var resolved = resolveStructuredTypeMembers(type);
+                for (var _i = 0, _a = resolved.callSignatures; _i < _a.length; _i++) {
+                    var signature = _a[_i];
+                    visitSignature(signature);
+                }
+                for (var _b = 0, _c = resolved.constructSignatures; _b < _c.length; _b++) {
+                    var signature = _c[_b];
+                    visitSignature(signature);
+                }
+                for (var _d = 0, _e = resolved.properties; _d < _e.length; _d++) {
+                    var p = _e[_d];
+                    visitSymbol(p);
+                }
+            }
+            function visitSymbol(symbol) {
+                if (!symbol) {
+                    return false;
+                }
+                var symbolId = ts.getSymbolId(symbol);
+                if (visitedSymbols[symbolId]) {
+                    return false;
+                }
+                visitedSymbols[symbolId] = symbol;
+                if (!accept(symbol)) {
+                    return true;
+                }
+                var t = getTypeOfSymbol(symbol);
+                visitType(t); // Should handle members on classes and such
+                if (symbol.flags & 1952 /* HasExports */) {
+                    symbol.exports.forEach(visitSymbol);
+                }
+                ts.forEach(symbol.declarations, function (d) {
+                    // Type queries are too far resolved when we just visit the symbol's type
+                    //  (their type resolved directly to the member deeply referenced)
+                    // So to get the intervening symbols, we need to check if there's a type
+                    // query node on any of the symbol's declarations and get symbols there
+                    if (d.type && d.type.kind === 165 /* TypeQuery */) {
+                        var query = d.type;
+                        var entity = getResolvedSymbol(getFirstIdentifier(query.exprName));
+                        visitSymbol(entity);
+                    }
+                });
+                return false;
+            }
+        }
+    }
+    ts.createGetSymbolWalker = createGetSymbolWalker;
+})(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var ambientModuleSymbolRegex = /^".+"$/;
@@ -21464,17 +28960,28 @@ var ts;
     ts.getSymbolId = getSymbolId;
     function isInstantiatedModule(node, preserveConstEnums) {
         var moduleState = ts.getModuleInstanceState(node);
-        return moduleState === 1 ||
-            (preserveConstEnums && moduleState === 2);
+        return moduleState === 1 /* Instantiated */ ||
+            (preserveConstEnums && moduleState === 2 /* ConstEnumOnly */);
     }
     ts.isInstantiatedModule = isInstantiatedModule;
     function createTypeChecker(host, produceDiagnostics) {
+        // Cancellation that controls whether or not we can cancel in the middle of type checking.
+        // In general cancelling is *not* safe for the type checker.  We might be in the middle of
+        // computing something, and we will leave our internals in an inconsistent state.  Callers
+        // who set the cancellation token should catch if a cancellation exception occurs, and
+        // should throw away and create a new TypeChecker.
+        //
+        // Currently we only support setting the cancellation token when getting diagnostics.  This
+        // is because diagnostics can be quite expensive, and we want to allow hosts to bail out if
+        // they no longer need the information (for example, if the user started editing again).
         var cancellationToken;
         var requestedExternalEmitHelpers;
         var externalHelpersModule;
+        // tslint:disable variable-name
         var Symbol = ts.objectAllocator.getSymbolConstructor();
         var Type = ts.objectAllocator.getTypeConstructor();
         var Signature = ts.objectAllocator.getSignatureConstructor();
+        // tslint:enable variable-name
         var typeCount = 0;
         var symbolCount = 0;
         var enumCount = 0;
@@ -21493,12 +29000,18 @@ var ts;
         var keyofStringsOnly = !!compilerOptions.keyofStringsOnly;
         var emitResolver = createResolver();
         var nodeBuilder = createNodeBuilder();
-        var undefinedSymbol = createSymbol(4, "undefined");
+        var undefinedSymbol = createSymbol(4 /* Property */, "undefined");
         undefinedSymbol.declarations = [];
-        var argumentsSymbol = createSymbol(4, "arguments");
-        var requireSymbol = createSymbol(4, "require");
-        var moduleSymbol = createSymbol(4, "module");
+        var argumentsSymbol = createSymbol(4 /* Property */, "arguments");
+        var requireSymbol = createSymbol(4 /* Property */, "require");
+        var moduleSymbol = createSymbol(4 /* Property */, "module");
+        /** This will be set during calls to `getResolvedSignature` where services determines an apparent number of arguments greater than what is actually provided. */
         var apparentArgumentCount;
+        // for public members that accept a Node or one of its subtypes, we must guard against
+        // synthetic nodes created during transformations by calling `getParseTreeNode`.
+        // for most of these, we perform the guard only on `checker` to avoid any possible
+        // extra cost of calling `getParseTreeNode` when calling these functions from inside the
+        // checker.
         var checker = {
             getNodeCount: function () { return ts.sum(host.getSourceFiles(), "nodeCount"); },
             getIdentifierCount: function () { return ts.sum(host.getSourceFiles(), "identifierCount"); },
@@ -21641,13 +29154,13 @@ var ts;
                 return parsed ? isImplementationOfOverload(parsed) : undefined;
             },
             getImmediateAliasedSymbol: function (symbol) {
-                ts.Debug.assert((symbol.flags & 2097152) !== 0, "Should only get Alias here.");
+                ts.Debug.assert((symbol.flags & 2097152 /* Alias */) !== 0, "Should only get Alias here.");
                 var links = getSymbolLinks(symbol);
                 if (!links.immediateTarget) {
                     var node = getDeclarationOfAliasSymbol(symbol);
                     if (!node)
                         return ts.Debug.fail();
-                    links.immediateTarget = getTargetOfAliasDeclaration(node, true);
+                    links.immediateTarget = getTargetOfAliasDeclaration(node, /*dontRecursivelyResolve*/ true);
                 }
                 return links.immediateTarget;
             },
@@ -21669,7 +29182,9 @@ var ts;
             tryGetMemberInModuleExports: function (name, symbol) { return tryGetMemberInModuleExports(ts.escapeLeadingUnderscores(name), symbol); },
             tryGetMemberInModuleExportsAndProperties: function (name, symbol) { return tryGetMemberInModuleExportsAndProperties(ts.escapeLeadingUnderscores(name), symbol); },
             tryFindAmbientModuleWithoutAugmentations: function (moduleName) {
-                return tryFindAmbientModule(moduleName, false);
+                // we deliberately exclude augmentations
+                // since we are only interested in declarations of the module itself
+                return tryFindAmbientModule(moduleName, /*withAugmentations*/ false);
             },
             getApparentType: getApparentType,
             getUnionType: getUnionType,
@@ -21683,6 +29198,8 @@ var ts;
             createPromiseType: createPromiseType,
             createArrayType: createArrayType,
             getBooleanType: function () { return booleanType; },
+            getFalseType: function () { return falseType; },
+            getTrueType: function () { return trueType; },
             getVoidType: function () { return voidType; },
             getUndefinedType: function () { return undefinedType; },
             getNullType: function () { return nullType; },
@@ -21695,9 +29212,9 @@ var ts;
             getSuggestionForNonexistentSymbol: function (location, name, meaning) { return getSuggestionForNonexistentSymbol(location, ts.escapeLeadingUnderscores(name), meaning); },
             getSuggestionForNonexistentModule: function (node, target) { return getSuggestionForNonexistentModule(node, target); },
             getBaseConstraintOfType: getBaseConstraintOfType,
-            getDefaultFromTypeParameter: function (type) { return type && type.flags & 65536 ? getDefaultFromTypeParameter(type) : undefined; },
+            getDefaultFromTypeParameter: function (type) { return type && type.flags & 65536 /* TypeParameter */ ? getDefaultFromTypeParameter(type) : undefined; },
             resolveName: function (name, location, meaning, excludeGlobals) {
-                return resolveName(location, ts.escapeLeadingUnderscores(name), meaning, undefined, undefined, false, excludeGlobals);
+                return resolveName(location, ts.escapeLeadingUnderscores(name), meaning, /*nameNotFoundMessage*/ undefined, /*nameArg*/ undefined, /*isUse*/ false, excludeGlobals);
             },
             getJsxNamespace: function (n) { return ts.unescapeLeadingUnderscores(getJsxNamespace(n)); },
             getAccessibleSymbolChain: getAccessibleSymbolChain,
@@ -21714,11 +29231,15 @@ var ts;
             getSuggestionDiagnostics: function (file, ct) {
                 var diagnostics;
                 try {
+                    // Record the cancellation token so it can be checked later on during checkSourceElement.
+                    // Do this in a finally block so we can ensure that it gets reset back to nothing after
+                    // this call is done.
                     cancellationToken = ct;
+                    // Ensure file is type checked
                     checkSourceFile(file);
-                    ts.Debug.assert(!!(getNodeLinks(file).flags & 1));
+                    ts.Debug.assert(!!(getNodeLinks(file).flags & 1 /* TypeChecked */));
                     diagnostics = ts.addRange(diagnostics, suggestionDiagnostics.get(file.fileName));
-                    if (!file.isDeclarationFile && (!unusedIsError(0) || !unusedIsError(1))) {
+                    if (!file.isDeclarationFile && (!unusedIsError(0 /* Local */) || !unusedIsError(1 /* Parameter */))) {
                         addUnusedDiagnostics();
                     }
                     return diagnostics || ts.emptyArray;
@@ -21751,56 +29272,63 @@ var ts;
         var indexedAccessTypes = ts.createMap();
         var evolvingArrayTypes = [];
         var undefinedProperties = ts.createMap();
-        var unknownSymbol = createSymbol(4, "unknown");
-        var resolvingSymbol = createSymbol(0, "__resolving__");
-        var anyType = createIntrinsicType(1, "any");
-        var autoType = createIntrinsicType(1, "any");
-        var wildcardType = createIntrinsicType(1, "any");
-        var errorType = createIntrinsicType(1, "error");
-        var unknownType = createIntrinsicType(2, "unknown");
-        var undefinedType = createIntrinsicType(8192, "undefined");
-        var undefinedWideningType = strictNullChecks ? undefinedType : createIntrinsicType(8192 | 134217728, "undefined");
-        var nullType = createIntrinsicType(16384, "null");
-        var nullWideningType = strictNullChecks ? nullType : createIntrinsicType(16384 | 134217728, "null");
-        var stringType = createIntrinsicType(4, "string");
-        var numberType = createIntrinsicType(8, "number");
-        var trueType = createIntrinsicType(256, "true");
-        var falseType = createIntrinsicType(256, "false");
-        var booleanType = createBooleanType([trueType, falseType]);
-        var esSymbolType = createIntrinsicType(1024, "symbol");
-        var voidType = createIntrinsicType(4096, "void");
-        var neverType = createIntrinsicType(32768, "never");
-        var silentNeverType = createIntrinsicType(32768, "never");
-        var implicitNeverType = createIntrinsicType(32768, "never");
-        var nonPrimitiveType = createIntrinsicType(16777216, "object");
+        var unknownSymbol = createSymbol(4 /* Property */, "unknown");
+        var resolvingSymbol = createSymbol(0, "__resolving__" /* Resolving */);
+        var anyType = createIntrinsicType(1 /* Any */, "any");
+        var autoType = createIntrinsicType(1 /* Any */, "any");
+        var wildcardType = createIntrinsicType(1 /* Any */, "any");
+        var errorType = createIntrinsicType(1 /* Any */, "error");
+        var unknownType = createIntrinsicType(2 /* Unknown */, "unknown");
+        var undefinedType = createIntrinsicType(8192 /* Undefined */, "undefined");
+        var undefinedWideningType = strictNullChecks ? undefinedType : createIntrinsicType(8192 /* Undefined */ | 134217728 /* ContainsWideningType */, "undefined");
+        var nullType = createIntrinsicType(16384 /* Null */, "null");
+        var nullWideningType = strictNullChecks ? nullType : createIntrinsicType(16384 /* Null */ | 134217728 /* ContainsWideningType */, "null");
+        var stringType = createIntrinsicType(4 /* String */, "string");
+        var numberType = createIntrinsicType(8 /* Number */, "number");
+        var falseType = createIntrinsicType(256 /* BooleanLiteral */, "false");
+        var trueType = createIntrinsicType(256 /* BooleanLiteral */, "true");
+        var booleanType = createBooleanType([falseType, trueType]);
+        var esSymbolType = createIntrinsicType(1024 /* ESSymbol */, "symbol");
+        var voidType = createIntrinsicType(4096 /* Void */, "void");
+        var neverType = createIntrinsicType(32768 /* Never */, "never");
+        var silentNeverType = createIntrinsicType(32768 /* Never */, "never");
+        var implicitNeverType = createIntrinsicType(32768 /* Never */, "never");
+        var nonPrimitiveType = createIntrinsicType(16777216 /* NonPrimitive */, "object");
         var stringNumberSymbolType = getUnionType([stringType, numberType, esSymbolType]);
         var keyofConstraintType = keyofStringsOnly ? stringType : stringNumberSymbolType;
         var emptyObjectType = createAnonymousType(undefined, emptySymbols, ts.emptyArray, ts.emptyArray, undefined, undefined);
-        var emptyTypeLiteralSymbol = createSymbol(2048, "__type");
+        var emptyTypeLiteralSymbol = createSymbol(2048 /* TypeLiteral */, "__type" /* Type */);
         emptyTypeLiteralSymbol.members = ts.createSymbolTable();
         var emptyTypeLiteralType = createAnonymousType(emptyTypeLiteralSymbol, emptySymbols, ts.emptyArray, ts.emptyArray, undefined, undefined);
         var emptyGenericType = createAnonymousType(undefined, emptySymbols, ts.emptyArray, ts.emptyArray, undefined, undefined);
         emptyGenericType.instantiations = ts.createMap();
         var anyFunctionType = createAnonymousType(undefined, emptySymbols, ts.emptyArray, ts.emptyArray, undefined, undefined);
-        anyFunctionType.flags |= 536870912;
+        // The anyFunctionType contains the anyFunctionType by definition. The flag is further propagated
+        // in getPropagatingFlagsOfTypes, and it is checked in inferFromTypes.
+        anyFunctionType.flags |= 536870912 /* ContainsAnyFunctionType */;
         var noConstraintType = createAnonymousType(undefined, emptySymbols, ts.emptyArray, ts.emptyArray, undefined, undefined);
         var circularConstraintType = createAnonymousType(undefined, emptySymbols, ts.emptyArray, ts.emptyArray, undefined, undefined);
         var resolvingDefaultType = createAnonymousType(undefined, emptySymbols, ts.emptyArray, ts.emptyArray, undefined, undefined);
-        var markerSuperType = createType(65536);
-        var markerSubType = createType(65536);
+        var markerSuperType = createType(65536 /* TypeParameter */);
+        var markerSubType = createType(65536 /* TypeParameter */);
         markerSubType.constraint = markerSuperType;
-        var markerOtherType = createType(65536);
+        var markerOtherType = createType(65536 /* TypeParameter */);
         var noTypePredicate = createIdentifierTypePredicate("<<unresolved>>", 0, anyType);
-        var anySignature = createSignature(undefined, undefined, undefined, ts.emptyArray, anyType, undefined, 0, false, false);
-        var unknownSignature = createSignature(undefined, undefined, undefined, ts.emptyArray, errorType, undefined, 0, false, false);
-        var resolvingSignature = createSignature(undefined, undefined, undefined, ts.emptyArray, anyType, undefined, 0, false, false);
-        var silentNeverSignature = createSignature(undefined, undefined, undefined, ts.emptyArray, silentNeverType, undefined, 0, false, false);
+        var anySignature = createSignature(undefined, undefined, undefined, ts.emptyArray, anyType, /*resolvedTypePredicate*/ undefined, 0, /*hasRestParameter*/ false, /*hasLiteralTypes*/ false);
+        var unknownSignature = createSignature(undefined, undefined, undefined, ts.emptyArray, errorType, /*resolvedTypePredicate*/ undefined, 0, /*hasRestParameter*/ false, /*hasLiteralTypes*/ false);
+        var resolvingSignature = createSignature(undefined, undefined, undefined, ts.emptyArray, anyType, /*resolvedTypePredicate*/ undefined, 0, /*hasRestParameter*/ false, /*hasLiteralTypes*/ false);
+        var silentNeverSignature = createSignature(undefined, undefined, undefined, ts.emptyArray, silentNeverType, /*resolvedTypePredicate*/ undefined, 0, /*hasRestParameter*/ false, /*hasLiteralTypes*/ false);
         var resolvingSignaturesArray = [resolvingSignature];
-        var enumNumberIndexInfo = createIndexInfo(stringType, true);
-        var jsObjectLiteralIndexInfo = createIndexInfo(anyType, false);
+        var enumNumberIndexInfo = createIndexInfo(stringType, /*isReadonly*/ true);
+        var jsObjectLiteralIndexInfo = createIndexInfo(anyType, /*isReadonly*/ false);
         var globals = ts.createSymbolTable();
         var reverseMappedCache = ts.createMap();
         var ambientModulesCache;
+        /**
+         * List of every ambient module with a "*" wildcard.
+         * Unlike other ambient modules, these can't be stored in `globals` because symbol tables only deal with exact matches.
+         * This is only used if there is no exact match.
+         */
         var patternAmbientModules;
         var globalObjectType;
         var globalFunctionType;
@@ -21815,6 +29343,9 @@ var ts;
         var autoArrayType;
         var anyReadonlyArrayType;
         var deferredGlobalNonNullableTypeAlias;
+        // The library files are only loaded when the feature is used.
+        // This allows users to just specify library files they want to used through --lib
+        // and they will not get an error from not having unrelated library files
         var deferredGlobalESSymbolConstructorSymbol;
         var deferredGlobalESSymbolType;
         var deferredGlobalTypedPropertyDescriptorType;
@@ -21831,7 +29362,7 @@ var ts;
         var deferredGlobalImportMetaType;
         var deferredGlobalExtractSymbol;
         var deferredNodes;
-        var allPotentiallyUnusedIdentifiers = ts.createMap();
+        var allPotentiallyUnusedIdentifiers = ts.createMap(); // key is file name
         var flowLoopStart = 0;
         var flowLoopCount = 0;
         var sharedFlowCount = 0;
@@ -21856,24 +29387,87 @@ var ts;
         var potentialNewTargetCollisions = [];
         var awaitedTypeStack = [];
         var diagnostics = ts.createDiagnosticCollection();
+        // Suggestion diagnostics must have a file. Keyed by source file name.
         var suggestionDiagnostics = ts.createMultiMap();
+        var TypeFacts;
+        (function (TypeFacts) {
+            TypeFacts[TypeFacts["None"] = 0] = "None";
+            TypeFacts[TypeFacts["TypeofEQString"] = 1] = "TypeofEQString";
+            TypeFacts[TypeFacts["TypeofEQNumber"] = 2] = "TypeofEQNumber";
+            TypeFacts[TypeFacts["TypeofEQBoolean"] = 4] = "TypeofEQBoolean";
+            TypeFacts[TypeFacts["TypeofEQSymbol"] = 8] = "TypeofEQSymbol";
+            TypeFacts[TypeFacts["TypeofEQObject"] = 16] = "TypeofEQObject";
+            TypeFacts[TypeFacts["TypeofEQFunction"] = 32] = "TypeofEQFunction";
+            TypeFacts[TypeFacts["TypeofEQHostObject"] = 64] = "TypeofEQHostObject";
+            TypeFacts[TypeFacts["TypeofNEString"] = 128] = "TypeofNEString";
+            TypeFacts[TypeFacts["TypeofNENumber"] = 256] = "TypeofNENumber";
+            TypeFacts[TypeFacts["TypeofNEBoolean"] = 512] = "TypeofNEBoolean";
+            TypeFacts[TypeFacts["TypeofNESymbol"] = 1024] = "TypeofNESymbol";
+            TypeFacts[TypeFacts["TypeofNEObject"] = 2048] = "TypeofNEObject";
+            TypeFacts[TypeFacts["TypeofNEFunction"] = 4096] = "TypeofNEFunction";
+            TypeFacts[TypeFacts["TypeofNEHostObject"] = 8192] = "TypeofNEHostObject";
+            TypeFacts[TypeFacts["EQUndefined"] = 16384] = "EQUndefined";
+            TypeFacts[TypeFacts["EQNull"] = 32768] = "EQNull";
+            TypeFacts[TypeFacts["EQUndefinedOrNull"] = 65536] = "EQUndefinedOrNull";
+            TypeFacts[TypeFacts["NEUndefined"] = 131072] = "NEUndefined";
+            TypeFacts[TypeFacts["NENull"] = 262144] = "NENull";
+            TypeFacts[TypeFacts["NEUndefinedOrNull"] = 524288] = "NEUndefinedOrNull";
+            TypeFacts[TypeFacts["Truthy"] = 1048576] = "Truthy";
+            TypeFacts[TypeFacts["Falsy"] = 2097152] = "Falsy";
+            TypeFacts[TypeFacts["All"] = 4194303] = "All";
+            // The following members encode facts about particular kinds of types for use in the getTypeFacts function.
+            // The presence of a particular fact means that the given test is true for some (and possibly all) values
+            // of that kind of type.
+            TypeFacts[TypeFacts["BaseStringStrictFacts"] = 933633] = "BaseStringStrictFacts";
+            TypeFacts[TypeFacts["BaseStringFacts"] = 3145473] = "BaseStringFacts";
+            TypeFacts[TypeFacts["StringStrictFacts"] = 4079361] = "StringStrictFacts";
+            TypeFacts[TypeFacts["StringFacts"] = 4194049] = "StringFacts";
+            TypeFacts[TypeFacts["EmptyStringStrictFacts"] = 3030785] = "EmptyStringStrictFacts";
+            TypeFacts[TypeFacts["EmptyStringFacts"] = 3145473] = "EmptyStringFacts";
+            TypeFacts[TypeFacts["NonEmptyStringStrictFacts"] = 1982209] = "NonEmptyStringStrictFacts";
+            TypeFacts[TypeFacts["NonEmptyStringFacts"] = 4194049] = "NonEmptyStringFacts";
+            TypeFacts[TypeFacts["BaseNumberStrictFacts"] = 933506] = "BaseNumberStrictFacts";
+            TypeFacts[TypeFacts["BaseNumberFacts"] = 3145346] = "BaseNumberFacts";
+            TypeFacts[TypeFacts["NumberStrictFacts"] = 4079234] = "NumberStrictFacts";
+            TypeFacts[TypeFacts["NumberFacts"] = 4193922] = "NumberFacts";
+            TypeFacts[TypeFacts["ZeroStrictFacts"] = 3030658] = "ZeroStrictFacts";
+            TypeFacts[TypeFacts["ZeroFacts"] = 3145346] = "ZeroFacts";
+            TypeFacts[TypeFacts["NonZeroStrictFacts"] = 1982082] = "NonZeroStrictFacts";
+            TypeFacts[TypeFacts["NonZeroFacts"] = 4193922] = "NonZeroFacts";
+            TypeFacts[TypeFacts["BaseBooleanStrictFacts"] = 933252] = "BaseBooleanStrictFacts";
+            TypeFacts[TypeFacts["BaseBooleanFacts"] = 3145092] = "BaseBooleanFacts";
+            TypeFacts[TypeFacts["BooleanStrictFacts"] = 4078980] = "BooleanStrictFacts";
+            TypeFacts[TypeFacts["BooleanFacts"] = 4193668] = "BooleanFacts";
+            TypeFacts[TypeFacts["FalseStrictFacts"] = 3030404] = "FalseStrictFacts";
+            TypeFacts[TypeFacts["FalseFacts"] = 3145092] = "FalseFacts";
+            TypeFacts[TypeFacts["TrueStrictFacts"] = 1981828] = "TrueStrictFacts";
+            TypeFacts[TypeFacts["TrueFacts"] = 4193668] = "TrueFacts";
+            TypeFacts[TypeFacts["SymbolStrictFacts"] = 1981320] = "SymbolStrictFacts";
+            TypeFacts[TypeFacts["SymbolFacts"] = 4193160] = "SymbolFacts";
+            TypeFacts[TypeFacts["ObjectStrictFacts"] = 1972176] = "ObjectStrictFacts";
+            TypeFacts[TypeFacts["ObjectFacts"] = 4184016] = "ObjectFacts";
+            TypeFacts[TypeFacts["FunctionStrictFacts"] = 1970144] = "FunctionStrictFacts";
+            TypeFacts[TypeFacts["FunctionFacts"] = 4181984] = "FunctionFacts";
+            TypeFacts[TypeFacts["UndefinedFacts"] = 2457472] = "UndefinedFacts";
+            TypeFacts[TypeFacts["NullFacts"] = 2340752] = "NullFacts";
+        })(TypeFacts || (TypeFacts = {}));
         var typeofEQFacts = ts.createMapFromTemplate({
-            string: 1,
-            number: 2,
-            boolean: 4,
-            symbol: 8,
-            undefined: 16384,
-            object: 16,
-            function: 32
+            string: 1 /* TypeofEQString */,
+            number: 2 /* TypeofEQNumber */,
+            boolean: 4 /* TypeofEQBoolean */,
+            symbol: 8 /* TypeofEQSymbol */,
+            undefined: 16384 /* EQUndefined */,
+            object: 16 /* TypeofEQObject */,
+            function: 32 /* TypeofEQFunction */
         });
         var typeofNEFacts = ts.createMapFromTemplate({
-            string: 128,
-            number: 256,
-            boolean: 512,
-            symbol: 1024,
-            undefined: 131072,
-            object: 2048,
-            function: 4096
+            string: 128 /* TypeofNEString */,
+            number: 256 /* TypeofNENumber */,
+            boolean: 512 /* TypeofNEBoolean */,
+            symbol: 1024 /* TypeofNESymbol */,
+            undefined: 131072 /* NEUndefined */,
+            object: 2048 /* TypeofNEObject */,
+            function: 4096 /* TypeofNEFunction */
         });
         var typeofTypesByName = ts.createMapFromTemplate({
             string: stringType,
@@ -21891,57 +29485,105 @@ var ts;
         var comparableRelation = ts.createMap();
         var identityRelation = ts.createMap();
         var enumRelation = ts.createMap();
+        var TypeSystemPropertyName;
+        (function (TypeSystemPropertyName) {
+            TypeSystemPropertyName[TypeSystemPropertyName["Type"] = 0] = "Type";
+            TypeSystemPropertyName[TypeSystemPropertyName["ResolvedBaseConstructorType"] = 1] = "ResolvedBaseConstructorType";
+            TypeSystemPropertyName[TypeSystemPropertyName["DeclaredType"] = 2] = "DeclaredType";
+            TypeSystemPropertyName[TypeSystemPropertyName["ResolvedReturnType"] = 3] = "ResolvedReturnType";
+            TypeSystemPropertyName[TypeSystemPropertyName["ResolvedBaseConstraint"] = 4] = "ResolvedBaseConstraint";
+        })(TypeSystemPropertyName || (TypeSystemPropertyName = {}));
+        var CheckMode;
+        (function (CheckMode) {
+            CheckMode[CheckMode["Normal"] = 0] = "Normal";
+            CheckMode[CheckMode["SkipContextSensitive"] = 1] = "SkipContextSensitive";
+            CheckMode[CheckMode["Inferential"] = 2] = "Inferential";
+            CheckMode[CheckMode["Contextual"] = 3] = "Contextual";
+        })(CheckMode || (CheckMode = {}));
+        var CallbackCheck;
+        (function (CallbackCheck) {
+            CallbackCheck[CallbackCheck["None"] = 0] = "None";
+            CallbackCheck[CallbackCheck["Bivariant"] = 1] = "Bivariant";
+            CallbackCheck[CallbackCheck["Strict"] = 2] = "Strict";
+        })(CallbackCheck || (CallbackCheck = {}));
+        var MappedTypeModifiers;
+        (function (MappedTypeModifiers) {
+            MappedTypeModifiers[MappedTypeModifiers["IncludeReadonly"] = 1] = "IncludeReadonly";
+            MappedTypeModifiers[MappedTypeModifiers["ExcludeReadonly"] = 2] = "ExcludeReadonly";
+            MappedTypeModifiers[MappedTypeModifiers["IncludeOptional"] = 4] = "IncludeOptional";
+            MappedTypeModifiers[MappedTypeModifiers["ExcludeOptional"] = 8] = "ExcludeOptional";
+        })(MappedTypeModifiers || (MappedTypeModifiers = {}));
+        var ExpandingFlags;
+        (function (ExpandingFlags) {
+            ExpandingFlags[ExpandingFlags["None"] = 0] = "None";
+            ExpandingFlags[ExpandingFlags["Source"] = 1] = "Source";
+            ExpandingFlags[ExpandingFlags["Target"] = 2] = "Target";
+            ExpandingFlags[ExpandingFlags["Both"] = 3] = "Both";
+        })(ExpandingFlags || (ExpandingFlags = {}));
+        var MembersOrExportsResolutionKind;
+        (function (MembersOrExportsResolutionKind) {
+            MembersOrExportsResolutionKind["resolvedExports"] = "resolvedExports";
+            MembersOrExportsResolutionKind["resolvedMembers"] = "resolvedMembers";
+        })(MembersOrExportsResolutionKind || (MembersOrExportsResolutionKind = {}));
+        var UnusedKind;
+        (function (UnusedKind) {
+            UnusedKind[UnusedKind["Local"] = 0] = "Local";
+            UnusedKind[UnusedKind["Parameter"] = 1] = "Parameter";
+        })(UnusedKind || (UnusedKind = {}));
         var builtinGlobals = ts.createSymbolTable();
         builtinGlobals.set(undefinedSymbol.escapedName, undefinedSymbol);
         var isNotOverloadAndNotAccessor = ts.and(isNotOverload, isNotAccessor);
         initializeTypeChecker();
         return checker;
+        /**
+         * @deprecated
+         */
         function getSymbolDisplayBuilder() {
             return {
                 buildTypeDisplay: function (type, writer, enclosingDeclaration, flags) {
                     typeToString(type, enclosingDeclaration, flags, emitTextWriterWrapper(writer));
                 },
                 buildSymbolDisplay: function (symbol, writer, enclosingDeclaration, meaning, flags) {
-                    if (flags === void 0) { flags = 0; }
-                    symbolToString(symbol, enclosingDeclaration, meaning, flags | 4, emitTextWriterWrapper(writer));
+                    if (flags === void 0) { flags = 0 /* None */; }
+                    symbolToString(symbol, enclosingDeclaration, meaning, flags | 4 /* AllowAnyNodeKind */, emitTextWriterWrapper(writer));
                 },
                 buildSignatureDisplay: function (signature, writer, enclosing, flags, kind) {
                     signatureToString(signature, enclosing, flags, kind, emitTextWriterWrapper(writer));
                 },
                 buildIndexSignatureDisplay: function (info, writer, kind, enclosing, flags) {
-                    var sig = nodeBuilder.indexInfoToIndexSignatureDeclaration(info, kind, enclosing, toNodeBuilderFlags(flags) | 3112960, writer);
+                    var sig = nodeBuilder.indexInfoToIndexSignatureDeclaration(info, kind, enclosing, toNodeBuilderFlags(flags) | 3112960 /* IgnoreErrors */, writer);
                     var printer = ts.createPrinter({ removeComments: true });
-                    printer.writeNode(4, sig, ts.getSourceFileOfNode(ts.getParseTreeNode(enclosing)), emitTextWriterWrapper(writer));
+                    printer.writeNode(4 /* Unspecified */, sig, ts.getSourceFileOfNode(ts.getParseTreeNode(enclosing)), emitTextWriterWrapper(writer));
                 },
                 buildParameterDisplay: function (symbol, writer, enclosing, flags) {
-                    var node = nodeBuilder.symbolToParameterDeclaration(symbol, enclosing, toNodeBuilderFlags(flags) | 3112960, writer);
+                    var node = nodeBuilder.symbolToParameterDeclaration(symbol, enclosing, toNodeBuilderFlags(flags) | 3112960 /* IgnoreErrors */, writer);
                     var printer = ts.createPrinter({ removeComments: true });
-                    printer.writeNode(4, node, ts.getSourceFileOfNode(ts.getParseTreeNode(enclosing)), emitTextWriterWrapper(writer));
+                    printer.writeNode(4 /* Unspecified */, node, ts.getSourceFileOfNode(ts.getParseTreeNode(enclosing)), emitTextWriterWrapper(writer)); // TODO: GH#18217
                 },
                 buildTypeParameterDisplay: function (tp, writer, enclosing, flags) {
-                    var node = nodeBuilder.typeParameterToDeclaration(tp, enclosing, toNodeBuilderFlags(flags) | 3112960 | 8192, writer);
+                    var node = nodeBuilder.typeParameterToDeclaration(tp, enclosing, toNodeBuilderFlags(flags) | 3112960 /* IgnoreErrors */ | 8192 /* OmitParameterModifiers */, writer);
                     var printer = ts.createPrinter({ removeComments: true });
-                    printer.writeNode(4, node, ts.getSourceFileOfNode(ts.getParseTreeNode(enclosing)), emitTextWriterWrapper(writer));
+                    printer.writeNode(4 /* Unspecified */, node, ts.getSourceFileOfNode(ts.getParseTreeNode(enclosing)), emitTextWriterWrapper(writer)); // TODO: GH#18217
                 },
                 buildTypePredicateDisplay: function (predicate, writer, enclosing, flags) {
                     typePredicateToString(predicate, enclosing, flags, emitTextWriterWrapper(writer));
                 },
                 buildTypeParameterDisplayFromSymbol: function (symbol, writer, enclosing, flags) {
-                    var nodes = nodeBuilder.symbolToTypeParameterDeclarations(symbol, enclosing, toNodeBuilderFlags(flags) | 3112960, writer);
+                    var nodes = nodeBuilder.symbolToTypeParameterDeclarations(symbol, enclosing, toNodeBuilderFlags(flags) | 3112960 /* IgnoreErrors */, writer);
                     var printer = ts.createPrinter({ removeComments: true });
-                    printer.writeList(26896, nodes, ts.getSourceFileOfNode(ts.getParseTreeNode(enclosing)), emitTextWriterWrapper(writer));
+                    printer.writeList(26896 /* TypeParameters */, nodes, ts.getSourceFileOfNode(ts.getParseTreeNode(enclosing)), emitTextWriterWrapper(writer));
                 },
                 buildDisplayForParametersAndDelimiters: function (thisParameter, parameters, writer, enclosing, originalFlags) {
                     var printer = ts.createPrinter({ removeComments: true });
-                    var flags = 8192 | 3112960 | toNodeBuilderFlags(originalFlags);
-                    var thisParameterArray = thisParameter ? [nodeBuilder.symbolToParameterDeclaration(thisParameter, enclosing, flags)] : [];
-                    var params = ts.createNodeArray(thisParameterArray.concat(ts.map(parameters, function (param) { return nodeBuilder.symbolToParameterDeclaration(param, enclosing, flags); })));
-                    printer.writeList(1296, params, ts.getSourceFileOfNode(ts.getParseTreeNode(enclosing)), emitTextWriterWrapper(writer));
+                    var flags = 8192 /* OmitParameterModifiers */ | 3112960 /* IgnoreErrors */ | toNodeBuilderFlags(originalFlags);
+                    var thisParameterArray = thisParameter ? [nodeBuilder.symbolToParameterDeclaration(thisParameter, enclosing, flags)] : []; // TODO: GH#18217
+                    var params = ts.createNodeArray(thisParameterArray.concat(ts.map(parameters, function (param) { return nodeBuilder.symbolToParameterDeclaration(param, enclosing, flags); }))); // TODO: GH#18217
+                    printer.writeList(1296 /* CallExpressionArguments */, params, ts.getSourceFileOfNode(ts.getParseTreeNode(enclosing)), emitTextWriterWrapper(writer));
                 },
                 buildDisplayForTypeParametersAndDelimiters: function (typeParameters, writer, enclosing, flags) {
                     var printer = ts.createPrinter({ removeComments: true });
-                    var args = ts.createNodeArray(ts.map(typeParameters, function (p) { return nodeBuilder.typeParameterToDeclaration(p, enclosing, toNodeBuilderFlags(flags)); }));
-                    printer.writeList(26896, args, ts.getSourceFileOfNode(ts.getParseTreeNode(enclosing)), emitTextWriterWrapper(writer));
+                    var args = ts.createNodeArray(ts.map(typeParameters, function (p) { return nodeBuilder.typeParameterToDeclaration(p, enclosing, toNodeBuilderFlags(flags)); })); // TODO: GH#18217
+                    printer.writeList(26896 /* TypeParameters */, args, ts.getSourceFileOfNode(ts.getParseTreeNode(enclosing)), emitTextWriterWrapper(writer));
                 },
                 buildReturnTypeDisplay: function (signature, writer, enclosing, flags) {
                     writer.writePunctuation(":");
@@ -21950,9 +29592,9 @@ var ts;
                     if (predicate) {
                         return typePredicateToString(predicate, enclosing, flags, emitTextWriterWrapper(writer));
                     }
-                    var node = nodeBuilder.typeToTypeNode(getReturnTypeOfSignature(signature), enclosing, toNodeBuilderFlags(flags) | 3112960, writer);
+                    var node = nodeBuilder.typeToTypeNode(getReturnTypeOfSignature(signature), enclosing, toNodeBuilderFlags(flags) | 3112960 /* IgnoreErrors */, writer);
                     var printer = ts.createPrinter({ removeComments: true });
-                    printer.writeNode(4, node, ts.getSourceFileOfNode(ts.getParseTreeNode(enclosing)), emitTextWriterWrapper(writer));
+                    printer.writeNode(4 /* Unspecified */, node, ts.getSourceFileOfNode(ts.getParseTreeNode(enclosing)), emitTextWriterWrapper(writer)); // TODO: GH#18217
                 }
             };
             function emitTextWriterWrapper(underlying) {
@@ -22032,17 +29674,17 @@ var ts;
         }
         function getJsxNamespace(location) {
             if (location) {
-                var file_1 = ts.getSourceFileOfNode(location);
-                if (file_1) {
-                    if (file_1.localJsxNamespace) {
-                        return file_1.localJsxNamespace;
+                var file = ts.getSourceFileOfNode(location);
+                if (file) {
+                    if (file.localJsxNamespace) {
+                        return file.localJsxNamespace;
                     }
-                    var jsxPragma = file_1.pragmas.get("jsx");
+                    var jsxPragma = file.pragmas.get("jsx");
                     if (jsxPragma) {
-                        var chosenpragma = ts.isArray(jsxPragma) ? jsxPragma[0] : jsxPragma;
-                        file_1.localJsxFactory = ts.parseIsolatedEntityName(chosenpragma.arguments.factory, languageVersion);
-                        if (file_1.localJsxFactory) {
-                            return file_1.localJsxNamespace = getFirstIdentifier(file_1.localJsxFactory).escapedText;
+                        var chosenpragma = ts.isArray(jsxPragma) ? jsxPragma[0] : jsxPragma; // TODO: GH#18217
+                        file.localJsxFactory = ts.parseIsolatedEntityName(chosenpragma.arguments.factory, languageVersion);
+                        if (file.localJsxFactory) {
+                            return file.localJsxNamespace = getFirstIdentifier(file.localJsxFactory).escapedText;
                         }
                     }
                 }
@@ -22062,6 +29704,8 @@ var ts;
             return _jsxNamespace;
         }
         function getEmitResolver(sourceFile, cancellationToken) {
+            // Ensure we have all the type information in place for this file so that all the
+            // emitter questions of this resolver will return the right information.
             getDiagnostics(sourceFile, cancellationToken);
             return emitResolver;
         }
@@ -22084,47 +29728,47 @@ var ts;
         }
         function createSymbol(flags, name, checkFlags) {
             symbolCount++;
-            var symbol = (new Symbol(flags | 33554432, name));
+            var symbol = (new Symbol(flags | 33554432 /* Transient */, name));
             symbol.checkFlags = checkFlags || 0;
             return symbol;
         }
         function isTransientSymbol(symbol) {
-            return (symbol.flags & 33554432) !== 0;
+            return (symbol.flags & 33554432 /* Transient */) !== 0;
         }
         function getExcludedSymbolFlags(flags) {
             var result = 0;
-            if (flags & 2)
-                result |= 67216319;
-            if (flags & 1)
-                result |= 67216318;
-            if (flags & 4)
-                result |= 0;
-            if (flags & 8)
-                result |= 68008959;
-            if (flags & 16)
-                result |= 67215791;
-            if (flags & 32)
-                result |= 68008383;
-            if (flags & 64)
-                result |= 67901832;
-            if (flags & 256)
-                result |= 68008191;
-            if (flags & 128)
-                result |= 68008831;
-            if (flags & 512)
-                result |= 67215503;
-            if (flags & 8192)
-                result |= 67208127;
-            if (flags & 32768)
-                result |= 67150783;
-            if (flags & 65536)
-                result |= 67183551;
-            if (flags & 262144)
-                result |= 67639784;
-            if (flags & 524288)
-                result |= 67901928;
-            if (flags & 2097152)
-                result |= 2097152;
+            if (flags & 2 /* BlockScopedVariable */)
+                result |= 67216319 /* BlockScopedVariableExcludes */;
+            if (flags & 1 /* FunctionScopedVariable */)
+                result |= 67216318 /* FunctionScopedVariableExcludes */;
+            if (flags & 4 /* Property */)
+                result |= 0 /* PropertyExcludes */;
+            if (flags & 8 /* EnumMember */)
+                result |= 68008959 /* EnumMemberExcludes */;
+            if (flags & 16 /* Function */)
+                result |= 67215791 /* FunctionExcludes */;
+            if (flags & 32 /* Class */)
+                result |= 68008383 /* ClassExcludes */;
+            if (flags & 64 /* Interface */)
+                result |= 67901832 /* InterfaceExcludes */;
+            if (flags & 256 /* RegularEnum */)
+                result |= 68008191 /* RegularEnumExcludes */;
+            if (flags & 128 /* ConstEnum */)
+                result |= 68008831 /* ConstEnumExcludes */;
+            if (flags & 512 /* ValueModule */)
+                result |= 67215503 /* ValueModuleExcludes */;
+            if (flags & 8192 /* Method */)
+                result |= 67208127 /* MethodExcludes */;
+            if (flags & 32768 /* GetAccessor */)
+                result |= 67150783 /* GetAccessorExcludes */;
+            if (flags & 65536 /* SetAccessor */)
+                result |= 67183551 /* SetAccessorExcludes */;
+            if (flags & 262144 /* TypeParameter */)
+                result |= 67639784 /* TypeParameterExcludes */;
+            if (flags & 524288 /* TypeAlias */)
+                result |= 67901928 /* TypeAliasExcludes */;
+            if (flags & 2097152 /* Alias */)
+                result |= 2097152 /* AliasExcludes */;
             return result;
         }
         function recordMergedSymbol(target, source) {
@@ -22149,20 +29793,27 @@ var ts;
             recordMergedSymbol(result, symbol);
             return result;
         }
+        /**
+         * Note: if target is transient, then it is mutable, and mergeSymbol with both mutate and return it.
+         * If target is not transient, mergeSymbol will produce a transient clone, mutate that and return it.
+         */
         function mergeSymbol(target, source) {
             if (!(target.flags & getExcludedSymbolFlags(source.flags)) ||
-                (source.flags | target.flags) & 67108864) {
+                (source.flags | target.flags) & 67108864 /* JSContainer */) {
                 ts.Debug.assert(source !== target);
-                if (!(target.flags & 33554432)) {
+                if (!(target.flags & 33554432 /* Transient */)) {
                     target = cloneSymbol(target);
                 }
-                if (source.flags & 512 && target.flags & 512 && target.constEnumOnlyModule && !source.constEnumOnlyModule) {
+                // Javascript static-property-assignment declarations always merge, even though they are also values
+                if (source.flags & 512 /* ValueModule */ && target.flags & 512 /* ValueModule */ && target.constEnumOnlyModule && !source.constEnumOnlyModule) {
+                    // reset flag when merging instantiated module into value module that has only const enums
                     target.constEnumOnlyModule = false;
                 }
                 target.flags |= source.flags;
                 if (source.valueDeclaration &&
                     (!target.valueDeclaration ||
-                        (target.valueDeclaration.kind === 239 && source.valueDeclaration.kind !== 239))) {
+                        ts.isEffectiveModuleDeclaration(target.valueDeclaration) && !ts.isEffectiveModuleDeclaration(source.valueDeclaration))) {
+                    // other kinds of value declarations take precedence over modules
                     target.valueDeclaration = source.valueDeclaration;
                 }
                 ts.addRange(target.declarations, source.declarations);
@@ -22178,21 +29829,21 @@ var ts;
                 }
                 recordMergedSymbol(target, source);
             }
-            else if (target.flags & 1024) {
+            else if (target.flags & 1024 /* NamespaceModule */) {
                 error(ts.getNameOfDeclaration(source.declarations[0]), ts.Diagnostics.Cannot_augment_module_0_with_value_exports_because_it_resolves_to_a_non_module_entity, symbolToString(target));
             }
             else {
-                var message_2 = target.flags & 384 || source.flags & 384
+                var message_2 = target.flags & 384 /* Enum */ || source.flags & 384 /* Enum */
                     ? ts.Diagnostics.Enum_declarations_can_only_merge_with_namespace_or_other_enum_declarations
-                    : target.flags & 2 || source.flags & 2
+                    : target.flags & 2 /* BlockScopedVariable */ || source.flags & 2 /* BlockScopedVariable */
                         ? ts.Diagnostics.Cannot_redeclare_block_scoped_variable_0
                         : ts.Diagnostics.Duplicate_identifier_0;
                 ts.forEach(source.declarations, function (node) {
-                    var errorNode = (ts.getJavascriptInitializer(node, false) ? ts.getOuterNameOfJsInitializer(node) : ts.getNameOfDeclaration(node)) || node;
+                    var errorNode = (ts.getJavascriptInitializer(node, /*isPrototypeAssignment*/ false) ? ts.getOuterNameOfJsInitializer(node) : ts.getNameOfDeclaration(node)) || node;
                     error(errorNode, message_2, symbolToString(source));
                 });
                 ts.forEach(target.declarations, function (node) {
-                    var errorNode = (ts.getJavascriptInitializer(node, false) ? ts.getOuterNameOfJsInitializer(node) : ts.getNameOfDeclaration(node)) || node;
+                    var errorNode = (ts.getJavascriptInitializer(node, /*isPrototypeAssignment*/ false) ? ts.getOuterNameOfJsInitializer(node) : ts.getNameOfDeclaration(node)) || node;
                     error(errorNode, message_2, symbolToString(source));
                 });
             }
@@ -22216,6 +29867,9 @@ var ts;
         function mergeModuleAugmentation(moduleName) {
             var moduleAugmentation = moduleName.parent;
             if (moduleAugmentation.symbol.declarations[0] !== moduleAugmentation) {
+                // this is a combined symbol for multiple augmentations within the same file.
+                // its symbol already has accumulated information for all declarations
+                // so we need to add it just once - do the work only for first declaration
                 ts.Debug.assert(moduleAugmentation.symbol.declarations.length > 1);
                 return;
             }
@@ -22223,18 +29877,22 @@ var ts;
                 mergeSymbolTable(globals, moduleAugmentation.symbol.exports);
             }
             else {
-                var moduleNotFoundError = !(moduleName.parent.parent.flags & 4194304)
+                // find a module that about to be augmented
+                // do not validate names of augmentations that are defined in ambient context
+                var moduleNotFoundError = !(moduleName.parent.parent.flags & 4194304 /* Ambient */)
                     ? ts.Diagnostics.Invalid_module_name_in_augmentation_module_0_cannot_be_found
                     : undefined;
-                var mainModule = resolveExternalModuleNameWorker(moduleName, moduleName, moduleNotFoundError, true);
+                var mainModule = resolveExternalModuleNameWorker(moduleName, moduleName, moduleNotFoundError, /*isForAugmentation*/ true);
                 if (!mainModule) {
                     return;
                 }
+                // obtain item referenced by 'export='
                 mainModule = resolveExternalModuleSymbol(mainModule);
-                if (mainModule.flags & 1920) {
+                if (mainModule.flags & 1920 /* Namespace */) {
                     mainModule = mergeSymbol(mainModule, moduleAugmentation.symbol);
                 }
                 else {
+                    // moduleName will be a StringLiteral since this is not `declare global`.
                     error(moduleName, ts.Diagnostics.Cannot_augment_module_0_because_it_resolves_to_a_non_module_entity, moduleName.text);
                 }
             }
@@ -22243,6 +29901,7 @@ var ts;
             source.forEach(function (sourceSymbol, id) {
                 var targetSymbol = target.get(id);
                 if (targetSymbol) {
+                    // Error on redeclarations
                     ts.forEach(targetSymbol.declarations, addDeclarationDiagnostic(ts.unescapeLeadingUnderscores(id), message));
                 }
                 else {
@@ -22254,7 +29913,7 @@ var ts;
             }
         }
         function getSymbolLinks(symbol) {
-            if (symbol.flags & 33554432)
+            if (symbol.flags & 33554432 /* Transient */)
                 return symbol;
             var id = getSymbolId(symbol);
             return symbolLinks[id] || (symbolLinks[id] = {});
@@ -22264,30 +29923,38 @@ var ts;
             return nodeLinks[nodeId] || (nodeLinks[nodeId] = { flags: 0 });
         }
         function isGlobalSourceFile(node) {
-            return node.kind === 274 && !ts.isExternalOrCommonJsModule(node);
+            return node.kind === 274 /* SourceFile */ && !ts.isExternalOrCommonJsModule(node);
         }
         function getSymbol(symbols, name, meaning) {
             if (meaning) {
                 var symbol = symbols.get(name);
                 if (symbol) {
-                    ts.Debug.assert((ts.getCheckFlags(symbol) & 1) === 0, "Should never get an instantiated symbol here.");
+                    ts.Debug.assert((ts.getCheckFlags(symbol) & 1 /* Instantiated */) === 0, "Should never get an instantiated symbol here.");
                     if (symbol.flags & meaning) {
                         return symbol;
                     }
-                    if (symbol.flags & 2097152) {
+                    if (symbol.flags & 2097152 /* Alias */) {
                         var target = resolveAlias(symbol);
+                        // Unknown symbol means an error occurred in alias resolution, treat it as positive answer to avoid cascading errors
                         if (target === unknownSymbol || target.flags & meaning) {
                             return symbol;
                         }
                     }
                 }
             }
+            // return undefined if we can't find a symbol.
         }
+        /**
+         * Get symbols that represent parameter-property-declaration as parameter and as property declaration
+         * @param parameter a parameterDeclaration node
+         * @param parameterName a name of the parameter to get the symbols for.
+         * @return a tuple of two symbols
+         */
         function getSymbolsOfParameterPropertyDeclaration(parameter, parameterName) {
             var constructorDeclaration = parameter.parent;
             var classDeclaration = parameter.parent.parent;
-            var parameterSymbol = getSymbol(constructorDeclaration.locals, parameterName, 67216319);
-            var propertySymbol = getSymbol(getMembersOfSymbol(classDeclaration.symbol), parameterName, 67216319);
+            var parameterSymbol = getSymbol(constructorDeclaration.locals, parameterName, 67216319 /* Value */);
+            var propertySymbol = getSymbol(getMembersOfSymbol(classDeclaration.symbol), parameterName, 67216319 /* Value */);
             if (parameterSymbol && propertySymbol) {
                 return [parameterSymbol, propertySymbol];
             }
@@ -22300,9 +29967,12 @@ var ts;
                 if ((moduleKind && (declarationFile.externalModuleIndicator || useFile.externalModuleIndicator)) ||
                     (!compilerOptions.outFile && !compilerOptions.out) ||
                     isInTypeQuery(usage) ||
-                    declaration.flags & 4194304) {
+                    declaration.flags & 4194304 /* Ambient */) {
+                    // nodes are in different files and order cannot be determined
                     return true;
                 }
+                // declaration is after usage
+                // can be legal if usage is deferred (i.e. inside function or in initializer of instance property)
                 if (isUsedInFunctionOrInstanceProperty(usage, declaration)) {
                     return true;
                 }
@@ -22310,26 +29980,41 @@ var ts;
                 return sourceFiles.indexOf(declarationFile) <= sourceFiles.indexOf(useFile);
             }
             if (declaration.pos <= usage.pos) {
-                if (declaration.kind === 182) {
-                    var errorBindingElement = ts.getAncestor(usage, 182);
+                // declaration is before usage
+                if (declaration.kind === 182 /* BindingElement */) {
+                    // still might be illegal if declaration and usage are both binding elements (eg var [a = b, b = b] = [1, 2])
+                    var errorBindingElement = ts.getAncestor(usage, 182 /* BindingElement */);
                     if (errorBindingElement) {
                         return ts.findAncestor(errorBindingElement, ts.isBindingElement) !== ts.findAncestor(declaration, ts.isBindingElement) ||
                             declaration.pos < errorBindingElement.pos;
                     }
-                    return isBlockScopedNameDeclaredBeforeUse(ts.getAncestor(declaration, 232), usage);
+                    // or it might be illegal if usage happens before parent variable is declared (eg var [a] = a)
+                    return isBlockScopedNameDeclaredBeforeUse(ts.getAncestor(declaration, 232 /* VariableDeclaration */), usage);
                 }
-                else if (declaration.kind === 232) {
+                else if (declaration.kind === 232 /* VariableDeclaration */) {
+                    // still might be illegal if usage is in the initializer of the variable declaration (eg var a = a)
                     return !isImmediatelyUsedInInitializerOfBlockScopedVariable(declaration, usage);
                 }
                 else if (ts.isClassDeclaration(declaration)) {
+                    // still might be illegal if the usage is within a computed property name in the class (eg class A { static p = "a"; [A.p]() {} })
                     return !ts.findAncestor(usage, function (n) { return ts.isComputedPropertyName(n) && n.parent.parent === declaration; });
                 }
                 return true;
             }
-            if (usage.parent.kind === 252 || (usage.parent.kind === 249 && usage.parent.isExportEquals)) {
+            // declaration is after usage, but it can still be legal if usage is deferred:
+            // 1. inside an export specifier
+            // 2. inside a function
+            // 3. inside an instance property initializer, a reference to a non-instance property
+            // 4. inside a static property initializer, a reference to a static method in the same class
+            // 5. inside a TS export= declaration (since we will move the export statement during emit to avoid TDZ)
+            // or if usage is in a type context:
+            // 1. inside a type query (typeof in type position)
+            if (usage.parent.kind === 252 /* ExportSpecifier */ || (usage.parent.kind === 249 /* ExportAssignment */ && usage.parent.isExportEquals)) {
+                // export specifiers do not use the variable, they only make it available for use
                 return true;
             }
-            if (usage.kind === 249 && usage.isExportEquals) {
+            // When resolving symbols for exports, the `usage` location passed in can be the export site directly
+            if (usage.kind === 249 /* ExportAssignment */ && usage.isExportEquals) {
                 return true;
             }
             var container = ts.getEnclosingBlockScopeContainer(declaration);
@@ -22337,14 +30022,17 @@ var ts;
             function isImmediatelyUsedInInitializerOfBlockScopedVariable(declaration, usage) {
                 var container = ts.getEnclosingBlockScopeContainer(declaration);
                 switch (declaration.parent.parent.kind) {
-                    case 214:
-                    case 220:
-                    case 222:
+                    case 214 /* VariableStatement */:
+                    case 220 /* ForStatement */:
+                    case 222 /* ForOfStatement */:
+                        // variable statement/for/for-of statement case,
+                        // use site should not be inside variable declaration (initializer of declaration or binding element)
                         if (isSameScopeDescendentOf(usage, declaration, container)) {
                             return true;
                         }
                         break;
                 }
+                // ForIn/ForOf case - use site should not be used in expression part
                 var grandparent = declaration.parent.parent;
                 return ts.isForInOrOfStatement(grandparent) && isSameScopeDescendentOf(usage, grandparent.expression, container);
             }
@@ -22357,16 +30045,16 @@ var ts;
                         return true;
                     }
                     var initializerOfProperty = current.parent &&
-                        current.parent.kind === 152 &&
+                        current.parent.kind === 152 /* PropertyDeclaration */ &&
                         current.parent.initializer === current;
                     if (initializerOfProperty) {
-                        if (ts.hasModifier(current.parent, 32)) {
-                            if (declaration.kind === 154) {
+                        if (ts.hasModifier(current.parent, 32 /* Static */)) {
+                            if (declaration.kind === 154 /* MethodDeclaration */) {
                                 return true;
                             }
                         }
                         else {
-                            var isDeclarationInstanceProperty = declaration.kind === 152 && !ts.hasModifier(declaration, 32);
+                            var isDeclarationInstanceProperty = declaration.kind === 152 /* PropertyDeclaration */ && !ts.hasModifier(declaration, 32 /* Static */);
                             if (!isDeclarationInstanceProperty || ts.getContainingClass(usage) !== ts.getContainingClass(declaration)) {
                                 return true;
                             }
@@ -22376,12 +30064,19 @@ var ts;
                 });
             }
         }
+        /**
+         * Resolve a given name for a given meaning at a given location. An error is reported if the name was not found and
+         * the nameNotFoundMessage argument is not undefined. Returns the resolved symbol, or undefined if no symbol with
+         * the given name can be found.
+         *
+         * @param isUse If true, this will count towards --noUnusedLocals / --noUnusedParameters.
+         */
         function resolveName(location, name, meaning, nameNotFoundMessage, nameArg, isUse, excludeGlobals, suggestedNameNotFoundMessage) {
             if (excludeGlobals === void 0) { excludeGlobals = false; }
             return resolveNameHelper(location, name, meaning, nameNotFoundMessage, nameArg, isUse, excludeGlobals, getSymbol, suggestedNameNotFoundMessage);
         }
         function resolveNameHelper(location, name, meaning, nameNotFoundMessage, nameArg, isUse, excludeGlobals, lookup, suggestedNameNotFoundMessage) {
-            var originalLocation = location;
+            var originalLocation = location; // needed for did-you-mean error reporting, which gathers candidates starting from the original location
             var result;
             var lastLocation;
             var lastSelfReferenceLocation;
@@ -22390,25 +30085,40 @@ var ts;
             var grandparent;
             var isInExternalModule = false;
             loop: while (location) {
+                // Locals of a source file are not in scope (because they get merged into the global symbol table)
                 if (location.locals && !isGlobalSourceFile(location)) {
                     if (result = lookup(location.locals, name, meaning)) {
                         var useResult = true;
                         if (ts.isFunctionLike(location) && lastLocation && lastLocation !== location.body) {
-                            if (meaning & result.flags & 67901928 && lastLocation.kind !== 286) {
-                                useResult = result.flags & 262144
+                            // symbol lookup restrictions for function-like declarations
+                            // - Type parameters of a function are in scope in the entire function declaration, including the parameter
+                            //   list and return type. However, local types are only in scope in the function body.
+                            // - parameters are only in the scope of function body
+                            // This restriction does not apply to JSDoc comment types because they are parented
+                            // at a higher level than type parameters would normally be
+                            if (meaning & result.flags & 67901928 /* Type */ && lastLocation.kind !== 286 /* JSDocComment */) {
+                                useResult = result.flags & 262144 /* TypeParameter */
+                                    // type parameters are visible in parameter list, return type and type parameter list
                                     ? lastLocation === location.type ||
-                                        lastLocation.kind === 149 ||
-                                        lastLocation.kind === 148
+                                        lastLocation.kind === 149 /* Parameter */ ||
+                                        lastLocation.kind === 148 /* TypeParameter */
+                                    // local types not visible outside the function body
                                     : false;
                             }
-                            if (meaning & 67216319 && result.flags & 1) {
+                            if (meaning & 67216319 /* Value */ && result.flags & 1 /* FunctionScopedVariable */) {
+                                // parameters are visible only inside function body, parameter list and return type
+                                // technically for parameter list case here we might mix parameters and variables declared in function,
+                                // however it is detected separately when checking initializers of parameters
+                                // to make sure that they reference no variables declared after them.
                                 useResult =
-                                    lastLocation.kind === 149 ||
+                                    lastLocation.kind === 149 /* Parameter */ ||
                                         (lastLocation === location.type &&
                                             !!ts.findAncestor(result.valueDeclaration, ts.isParameter));
                             }
                         }
-                        else if (location.kind === 171) {
+                        else if (location.kind === 171 /* ConditionalType */) {
+                            // A type parameter declared using 'infer T' in a conditional type is visible only in
+                            // the true branch of the conditional type.
                             useResult = lastLocation === location.trueType;
                         }
                         if (useResult) {
@@ -22420,28 +30130,43 @@ var ts;
                     }
                 }
                 switch (location.kind) {
-                    case 274:
+                    case 274 /* SourceFile */:
                         if (!ts.isExternalOrCommonJsModule(location))
                             break;
                         isInExternalModule = true;
-                    case 239:
+                    // falls through
+                    case 239 /* ModuleDeclaration */:
                         var moduleExports = getSymbolOfNode(location).exports;
-                        if (location.kind === 274 || ts.isAmbientModule(location)) {
-                            if (result = moduleExports.get("default")) {
+                        if (location.kind === 274 /* SourceFile */ || ts.isAmbientModule(location)) {
+                            // It's an external module. First see if the module has an export default and if the local
+                            // name of that export default matches.
+                            if (result = moduleExports.get("default" /* Default */)) {
                                 var localSymbol = ts.getLocalSymbolForExportDefault(result);
                                 if (localSymbol && (result.flags & meaning) && localSymbol.escapedName === name) {
                                     break loop;
                                 }
                                 result = undefined;
                             }
+                            // Because of module/namespace merging, a module's exports are in scope,
+                            // yet we never want to treat an export specifier as putting a member in scope.
+                            // Therefore, if the name we find is purely an export specifier, it is not actually considered in scope.
+                            // Two things to note about this:
+                            //     1. We have to check this without calling getSymbol. The problem with calling getSymbol
+                            //        on an export specifier is that it might find the export specifier itself, and try to
+                            //        resolve it as an alias. This will cause the checker to consider the export specifier
+                            //        a circular alias reference when it might not be.
+                            //     2. We check === SymbolFlags.Alias in order to check that the symbol is *purely*
+                            //        an alias. If we used &, we'd be throwing out symbols that have non alias aspects,
+                            //        which is not the desired behavior.
                             var moduleExport = moduleExports.get(name);
                             if (moduleExport &&
-                                moduleExport.flags === 2097152 &&
-                                ts.getDeclarationOfKind(moduleExport, 252)) {
+                                moduleExport.flags === 2097152 /* Alias */ &&
+                                ts.getDeclarationOfKind(moduleExport, 252 /* ExportSpecifier */)) {
                                 break;
                             }
                         }
-                        if (name !== "default" && (result = lookup(moduleExports, name, meaning & 2623475))) {
+                        // ES6 exports are also visible locally (except for 'default'), but commonjs exports are not (except typedefs)
+                        if (name !== "default" /* Default */ && (result = lookup(moduleExports, name, meaning & 2623475 /* ModuleMember */))) {
                             if (ts.isSourceFile(location) && location.commonJsModuleIndicator && !result.declarations.some(ts.isJSDocTypeAlias)) {
                                 result = undefined;
                             }
@@ -22450,37 +30175,48 @@ var ts;
                             }
                         }
                         break;
-                    case 238:
-                        if (result = lookup(getSymbolOfNode(location).exports, name, meaning & 8)) {
+                    case 238 /* EnumDeclaration */:
+                        if (result = lookup(getSymbolOfNode(location).exports, name, meaning & 8 /* EnumMember */)) {
                             break loop;
                         }
                         break;
-                    case 152:
-                    case 151:
-                        if (ts.isClassLike(location.parent) && !ts.hasModifier(location, 32)) {
+                    case 152 /* PropertyDeclaration */:
+                    case 151 /* PropertySignature */:
+                        // TypeScript 1.0 spec (April 2014): 8.4.1
+                        // Initializer expressions for instance member variables are evaluated in the scope
+                        // of the class constructor body but are not permitted to reference parameters or
+                        // local variables of the constructor. This effectively means that entities from outer scopes
+                        // by the same name as a constructor parameter or local variable are inaccessible
+                        // in initializer expressions for instance member variables.
+                        if (ts.isClassLike(location.parent) && !ts.hasModifier(location, 32 /* Static */)) {
                             var ctor = findConstructorDeclaration(location.parent);
                             if (ctor && ctor.locals) {
-                                if (lookup(ctor.locals, name, meaning & 67216319)) {
+                                if (lookup(ctor.locals, name, meaning & 67216319 /* Value */)) {
+                                    // Remember the property node, it will be used later to report appropriate error
                                     propertyWithInvalidInitializer = location;
                                 }
                             }
                         }
                         break;
-                    case 235:
-                    case 205:
-                    case 236:
-                        if (result = lookup(getMembersOfSymbol(getSymbolOfNode(location)), name, meaning & 67901928)) {
+                    case 235 /* ClassDeclaration */:
+                    case 205 /* ClassExpression */:
+                    case 236 /* InterfaceDeclaration */:
+                        if (result = lookup(getMembersOfSymbol(getSymbolOfNode(location)), name, meaning & 67901928 /* Type */)) {
                             if (!isTypeParameterSymbolDeclaredInContainer(result, location)) {
+                                // ignore type parameters not declared in this container
                                 result = undefined;
                                 break;
                             }
-                            if (lastLocation && ts.hasModifier(lastLocation, 32)) {
+                            if (lastLocation && ts.hasModifier(lastLocation, 32 /* Static */)) {
+                                // TypeScript 1.0 spec (April 2014): 3.4.1
+                                // The scope of a type parameter extends over the entire declaration with which the type
+                                // parameter list is associated, with the exception of static member declarations in classes.
                                 error(errorLocation, ts.Diagnostics.Static_members_cannot_reference_class_type_parameters);
                                 return undefined;
                             }
                             break loop;
                         }
-                        if (location.kind === 205 && meaning & 32) {
+                        if (location.kind === 205 /* ClassExpression */ && meaning & 32 /* Class */) {
                             var className = location.name;
                             if (className && name === className.escapedText) {
                                 result = location.symbol;
@@ -22488,10 +30224,11 @@ var ts;
                             }
                         }
                         break;
-                    case 207:
-                        if (lastLocation === location.expression && location.parent.token === 85) {
+                    case 207 /* ExpressionWithTypeArguments */:
+                        // The type parameters of a class are not in scope in the base class expression.
+                        if (lastLocation === location.expression && location.parent.token === 85 /* ExtendsKeyword */) {
                             var container = location.parent.parent;
-                            if (ts.isClassLike(container) && (result = lookup(getSymbolOfNode(container).members, name, meaning & 67901928))) {
+                            if (ts.isClassLike(container) && (result = lookup(getSymbolOfNode(container).members, name, meaning & 67901928 /* Type */))) {
                                 if (nameNotFoundMessage) {
                                     error(errorLocation, ts.Diagnostics.Base_class_expressions_cannot_reference_class_type_parameters);
                                 }
@@ -22499,33 +30236,42 @@ var ts;
                             }
                         }
                         break;
-                    case 147:
+                    // It is not legal to reference a class's own type parameters from a computed property name that
+                    // belongs to the class. For example:
+                    //
+                    //   function foo<T>() { return '' }
+                    //   class C<T> { // <-- Class's own type parameter T
+                    //       [foo<T>()]() { } // <-- Reference to T from class's own computed property
+                    //   }
+                    //
+                    case 147 /* ComputedPropertyName */:
                         grandparent = location.parent.parent;
-                        if (ts.isClassLike(grandparent) || grandparent.kind === 236) {
-                            if (result = lookup(getSymbolOfNode(grandparent).members, name, meaning & 67901928)) {
+                        if (ts.isClassLike(grandparent) || grandparent.kind === 236 /* InterfaceDeclaration */) {
+                            // A reference to this grandparent's type parameters would be an error
+                            if (result = lookup(getSymbolOfNode(grandparent).members, name, meaning & 67901928 /* Type */)) {
                                 error(errorLocation, ts.Diagnostics.A_computed_property_name_cannot_reference_a_type_parameter_from_its_containing_type);
                                 return undefined;
                             }
                         }
                         break;
-                    case 154:
-                    case 153:
-                    case 155:
-                    case 156:
-                    case 157:
-                    case 234:
-                    case 193:
-                        if (meaning & 3 && name === "arguments") {
+                    case 154 /* MethodDeclaration */:
+                    case 153 /* MethodSignature */:
+                    case 155 /* Constructor */:
+                    case 156 /* GetAccessor */:
+                    case 157 /* SetAccessor */:
+                    case 234 /* FunctionDeclaration */:
+                    case 193 /* ArrowFunction */:
+                        if (meaning & 3 /* Variable */ && name === "arguments") {
                             result = argumentsSymbol;
                             break loop;
                         }
                         break;
-                    case 192:
-                        if (meaning & 3 && name === "arguments") {
+                    case 192 /* FunctionExpression */:
+                        if (meaning & 3 /* Variable */ && name === "arguments") {
                             result = argumentsSymbol;
                             break loop;
                         }
-                        if (meaning & 16) {
+                        if (meaning & 16 /* Function */) {
                             var functionName = location.name;
                             if (functionName && name === functionName.escapedText) {
                                 result = location.symbol;
@@ -22533,16 +30279,31 @@ var ts;
                             }
                         }
                         break;
-                    case 150:
-                        if (location.parent && location.parent.kind === 149) {
+                    case 150 /* Decorator */:
+                        // Decorators are resolved at the class declaration. Resolving at the parameter
+                        // or member would result in looking up locals in the method.
+                        //
+                        //   function y() {}
+                        //   class C {
+                        //       method(@y x, y) {} // <-- decorator y should be resolved at the class declaration, not the parameter.
+                        //   }
+                        //
+                        if (location.parent && location.parent.kind === 149 /* Parameter */) {
                             location = location.parent;
                         }
+                        //
+                        //   function y() {}
+                        //   class C {
+                        //       @y method(x, y) {} // <-- decorator y should be resolved at the class declaration, not the method.
+                        //   }
+                        //
                         if (location.parent && ts.isClassElement(location.parent)) {
                             location = location.parent;
                         }
                         break;
-                    case 297:
-                    case 292:
+                    case 297 /* JSDocTypedefTag */:
+                    case 292 /* JSDocCallbackTag */:
+                        // js type aliases do not resolve names from their host, so skip past it
                         location = ts.getJSDocHost(location);
                         break;
                 }
@@ -22552,12 +30313,15 @@ var ts;
                 lastLocation = location;
                 location = location.parent;
             }
+            // We just climbed up parents looking for the name, meaning that we started in a descendant node of `lastLocation`.
+            // If `result === lastSelfReferenceLocation.symbol`, that means that we are somewhere inside `lastSelfReferenceLocation` looking up a name, and resolving to `lastLocation` itself.
+            // That means that this is a self-reference of `lastLocation`, and shouldn't count this when considering whether `lastLocation` is used.
             if (isUse && result && (!lastSelfReferenceLocation || result !== lastSelfReferenceLocation.symbol)) {
                 result.isReferenced |= meaning;
             }
             if (!result) {
                 if (lastLocation) {
-                    ts.Debug.assert(lastLocation.kind === 274);
+                    ts.Debug.assert(lastLocation.kind === 274 /* SourceFile */);
                     if (lastLocation.commonJsModuleIndicator && name === "exports") {
                         return lastLocation.symbol;
                     }
@@ -22568,7 +30332,7 @@ var ts;
             }
             if (!result) {
                 if (originalLocation && ts.isInJavaScriptFile(originalLocation) && originalLocation.parent) {
-                    if (ts.isRequireCall(originalLocation.parent, false)) {
+                    if (ts.isRequireCall(originalLocation.parent, /*checkArgumentIsStringLiteralLike*/ false)) {
                         return requireSymbol;
                     }
                     if (ts.isIdentifier(originalLocation) && ts.isPropertyAccessExpression(originalLocation.parent) &&
@@ -22580,7 +30344,7 @@ var ts;
             if (!result) {
                 if (nameNotFoundMessage) {
                     if (!errorLocation ||
-                        !checkAndReportErrorForMissingPrefix(errorLocation, name, nameArg) &&
+                        !checkAndReportErrorForMissingPrefix(errorLocation, name, nameArg) && // TODO: GH#18217
                             !checkAndReportErrorForExtendingInterface(errorLocation) &&
                             !checkAndReportErrorForUsingTypeAsNamespace(errorLocation, name, meaning) &&
                             !checkAndReportErrorForUsingTypeAsValue(errorLocation, name, meaning) &&
@@ -22600,24 +30364,39 @@ var ts;
                 }
                 return undefined;
             }
+            // Perform extra checks only if error reporting was requested
             if (nameNotFoundMessage) {
                 if (propertyWithInvalidInitializer) {
+                    // We have a match, but the reference occurred within a property initializer and the identifier also binds
+                    // to a local variable in the constructor where the code will be emitted.
                     var propertyName = propertyWithInvalidInitializer.name;
                     error(errorLocation, ts.Diagnostics.Initializer_of_instance_member_variable_0_cannot_reference_identifier_1_declared_in_the_constructor, ts.declarationNameToString(propertyName), diagnosticName(nameArg));
                     return undefined;
                 }
+                // Only check for block-scoped variable if we have an error location and are looking for the
+                // name with variable meaning
+                //      For example,
+                //          declare module foo {
+                //              interface bar {}
+                //          }
+                //      const foo/*1*/: foo/*2*/.bar;
+                // The foo at /*1*/ and /*2*/ will share same symbol with two meanings:
+                // block-scoped variable and namespace module. However, only when we
+                // try to resolve name in /*1*/ which is used in variable position,
+                // we want to check for block-scoped
                 if (errorLocation &&
-                    (meaning & 2 ||
-                        ((meaning & 32 || meaning & 384) && (meaning & 67216319) === 67216319))) {
+                    (meaning & 2 /* BlockScopedVariable */ ||
+                        ((meaning & 32 /* Class */ || meaning & 384 /* Enum */) && (meaning & 67216319 /* Value */) === 67216319 /* Value */))) {
                     var exportOrLocalSymbol = getExportSymbolOfValueSymbolIfExported(result);
-                    if (exportOrLocalSymbol.flags & 2 || exportOrLocalSymbol.flags & 32 || exportOrLocalSymbol.flags & 384) {
+                    if (exportOrLocalSymbol.flags & 2 /* BlockScopedVariable */ || exportOrLocalSymbol.flags & 32 /* Class */ || exportOrLocalSymbol.flags & 384 /* Enum */) {
                         checkResolvedBlockScopedVariable(exportOrLocalSymbol, errorLocation);
                     }
                 }
-                if (result && isInExternalModule && (meaning & 67216319) === 67216319 && !(originalLocation.flags & 2097152)) {
+                // If we're in an external module, we can't reference value symbols created from UMD export declarations
+                if (result && isInExternalModule && (meaning & 67216319 /* Value */) === 67216319 /* Value */ && !(originalLocation.flags & 2097152 /* JSDoc */)) {
                     var decls = result.declarations;
-                    if (decls && decls.length === 1 && decls[0].kind === 242) {
-                        error(errorLocation, ts.Diagnostics._0_refers_to_a_UMD_global_but_the_current_file_is_a_module_Consider_adding_an_import_instead, ts.unescapeLeadingUnderscores(name));
+                    if (decls && decls.length === 1 && decls[0].kind === 242 /* NamespaceExportDeclaration */) {
+                        error(errorLocation, ts.Diagnostics._0_refers_to_a_UMD_global_but_the_current_file_is_a_module_Consider_adding_an_import_instead, ts.unescapeLeadingUnderscores(name)); // TODO: GH#18217
                     }
                 }
             }
@@ -22625,12 +30404,12 @@ var ts;
         }
         function isSelfReferenceLocation(node) {
             switch (node.kind) {
-                case 234:
-                case 235:
-                case 236:
-                case 238:
-                case 237:
-                case 239:
+                case 234 /* FunctionDeclaration */:
+                case 235 /* ClassDeclaration */:
+                case 236 /* InterfaceDeclaration */:
+                case 238 /* EnumDeclaration */:
+                case 237 /* TypeAliasDeclaration */:
+                case 239 /* ModuleDeclaration */: // For `namespace N { N; }`
                     return true;
                 default:
                     return false;
@@ -22642,10 +30421,10 @@ var ts;
         function isTypeParameterSymbolDeclaredInContainer(symbol, container) {
             for (var _i = 0, _a = symbol.declarations; _i < _a.length; _i++) {
                 var decl = _a[_i];
-                if (decl.kind === 148) {
+                if (decl.kind === 148 /* TypeParameter */) {
                     var parent = ts.isJSDocTemplateTag(decl.parent) ? ts.getJSDocHost(decl.parent) : decl.parent;
                     if (parent === container) {
-                        return !(ts.isJSDocTemplateTag(decl.parent) && ts.find(decl.parent.parent.tags, ts.isJSDocTypeAlias));
+                        return !(ts.isJSDocTemplateTag(decl.parent) && ts.find(decl.parent.parent.tags, ts.isJSDocTypeAlias)); // TODO: GH#18217
                     }
                 }
             }
@@ -22655,7 +30434,7 @@ var ts;
             if (!ts.isIdentifier(errorLocation) || errorLocation.escapedText !== name || isTypeReferenceIdentifier(errorLocation) || isInTypeQuery(errorLocation)) {
                 return false;
             }
-            var container = ts.getThisContainer(errorLocation, false);
+            var container = ts.getThisContainer(errorLocation, /*includeArrowFunctions*/ false);
             var location = container;
             while (location) {
                 if (ts.isClassLike(location.parent)) {
@@ -22663,13 +30442,16 @@ var ts;
                     if (!classSymbol) {
                         break;
                     }
+                    // Check to see if a static member exists.
                     var constructorType = getTypeOfSymbol(classSymbol);
                     if (getPropertyOfType(constructorType, name)) {
                         error(errorLocation, ts.Diagnostics.Cannot_find_name_0_Did_you_mean_the_static_member_1_0, diagnosticName(nameArg), symbolToString(classSymbol));
                         return true;
                     }
-                    if (location === container && !ts.hasModifier(location, 32)) {
-                        var instanceType = getDeclaredTypeOfSymbol(classSymbol).thisType;
+                    // No static member is present.
+                    // Check if we're in an instance method and look for a relevant instance member.
+                    if (location === container && !ts.hasModifier(location, 32 /* Static */)) {
+                        var instanceType = getDeclaredTypeOfSymbol(classSymbol).thisType; // TODO: GH#18217
                         if (getPropertyOfType(instanceType, name)) {
                             error(errorLocation, ts.Diagnostics.Cannot_find_name_0_Did_you_mean_the_instance_member_this_0, diagnosticName(nameArg));
                             return true;
@@ -22682,29 +30464,34 @@ var ts;
         }
         function checkAndReportErrorForExtendingInterface(errorLocation) {
             var expression = getEntityNameForExtendingInterface(errorLocation);
-            if (expression && resolveEntityName(expression, 64, true)) {
+            if (expression && resolveEntityName(expression, 64 /* Interface */, /*ignoreErrors*/ true)) {
                 error(errorLocation, ts.Diagnostics.Cannot_extend_an_interface_0_Did_you_mean_implements, ts.getTextOfNode(expression));
                 return true;
             }
             return false;
         }
+        /**
+         * Climbs up parents to an ExpressionWithTypeArguments, and returns its expression,
+         * but returns undefined if that expression is not an EntityNameExpression.
+         */
         function getEntityNameForExtendingInterface(node) {
             switch (node.kind) {
-                case 71:
-                case 185:
+                case 71 /* Identifier */:
+                case 185 /* PropertyAccessExpression */:
                     return node.parent ? getEntityNameForExtendingInterface(node.parent) : undefined;
-                case 207:
+                case 207 /* ExpressionWithTypeArguments */:
                     if (ts.isEntityNameExpression(node.expression)) {
                         return node.expression;
                     }
+                // falls through
                 default:
                     return undefined;
             }
         }
         function checkAndReportErrorForUsingTypeAsNamespace(errorLocation, name, meaning) {
-            var namespaceMeaning = 1920 | (ts.isInJavaScriptFile(errorLocation) ? 67216319 : 0);
+            var namespaceMeaning = 1920 /* Namespace */ | (ts.isInJavaScriptFile(errorLocation) ? 67216319 /* Value */ : 0);
             if (meaning === namespaceMeaning) {
-                var symbol = resolveSymbol(resolveName(errorLocation, name, 67901928 & ~namespaceMeaning, undefined, undefined, false));
+                var symbol = resolveSymbol(resolveName(errorLocation, name, 67901928 /* Type */ & ~namespaceMeaning, /*nameNotFoundMessage*/ undefined, /*nameArg*/ undefined, /*isUse*/ false));
                 var parent = errorLocation.parent;
                 if (symbol) {
                     if (ts.isQualifiedName(parent)) {
@@ -22723,13 +30510,13 @@ var ts;
             return false;
         }
         function checkAndReportErrorForUsingTypeAsValue(errorLocation, name, meaning) {
-            if (meaning & (67216319 & ~1024)) {
+            if (meaning & (67216319 /* Value */ & ~1024 /* NamespaceModule */)) {
                 if (name === "any" || name === "string" || name === "number" || name === "boolean" || name === "never") {
                     error(errorLocation, ts.Diagnostics._0_only_refers_to_a_type_but_is_being_used_as_a_value_here, ts.unescapeLeadingUnderscores(name));
                     return true;
                 }
-                var symbol = resolveSymbol(resolveName(errorLocation, name, 67901928 & ~67216319, undefined, undefined, false));
-                if (symbol && !(symbol.flags & 1024)) {
+                var symbol = resolveSymbol(resolveName(errorLocation, name, 67901928 /* Type */ & ~67216319 /* Value */, /*nameNotFoundMessage*/ undefined, /*nameArg*/ undefined, /*isUse*/ false));
+                if (symbol && !(symbol.flags & 1024 /* NamespaceModule */)) {
                     error(errorLocation, ts.Diagnostics._0_only_refers_to_a_type_but_is_being_used_as_a_value_here, ts.unescapeLeadingUnderscores(name));
                     return true;
                 }
@@ -22737,15 +30524,15 @@ var ts;
             return false;
         }
         function checkAndReportErrorForUsingNamespaceModuleAsValue(errorLocation, name, meaning) {
-            if (meaning & (67216319 & ~1024 & ~67901928)) {
-                var symbol = resolveSymbol(resolveName(errorLocation, name, 1024 & ~67216319, undefined, undefined, false));
+            if (meaning & (67216319 /* Value */ & ~1024 /* NamespaceModule */ & ~67901928 /* Type */)) {
+                var symbol = resolveSymbol(resolveName(errorLocation, name, 1024 /* NamespaceModule */ & ~67216319 /* Value */, /*nameNotFoundMessage*/ undefined, /*nameArg*/ undefined, /*isUse*/ false));
                 if (symbol) {
                     error(errorLocation, ts.Diagnostics.Cannot_use_namespace_0_as_a_value, ts.unescapeLeadingUnderscores(name));
                     return true;
                 }
             }
-            else if (meaning & (67901928 & ~1024 & ~67216319)) {
-                var symbol = resolveSymbol(resolveName(errorLocation, name, (512 | 1024) & ~67901928, undefined, undefined, false));
+            else if (meaning & (67901928 /* Type */ & ~1024 /* NamespaceModule */ & ~67216319 /* Value */)) {
+                var symbol = resolveSymbol(resolveName(errorLocation, name, (512 /* ValueModule */ | 1024 /* NamespaceModule */) & ~67901928 /* Type */, /*nameNotFoundMessage*/ undefined, /*nameArg*/ undefined, /*isUse*/ false));
                 if (symbol) {
                     error(errorLocation, ts.Diagnostics.Cannot_use_namespace_0_as_a_type, ts.unescapeLeadingUnderscores(name));
                     return true;
@@ -22754,34 +30541,39 @@ var ts;
             return false;
         }
         function checkResolvedBlockScopedVariable(result, errorLocation) {
-            ts.Debug.assert(!!(result.flags & 2 || result.flags & 32 || result.flags & 384));
-            var declaration = ts.forEach(result.declarations, function (d) { return ts.isBlockOrCatchScoped(d) || ts.isClassLike(d) || (d.kind === 238) ? d : undefined; });
+            ts.Debug.assert(!!(result.flags & 2 /* BlockScopedVariable */ || result.flags & 32 /* Class */ || result.flags & 384 /* Enum */));
+            // Block-scoped variables cannot be used before their definition
+            var declaration = ts.forEach(result.declarations, function (d) { return ts.isBlockOrCatchScoped(d) || ts.isClassLike(d) || (d.kind === 238 /* EnumDeclaration */) ? d : undefined; });
             if (declaration === undefined)
                 return ts.Debug.fail("Declaration to checkResolvedBlockScopedVariable is undefined");
-            if (!(declaration.flags & 4194304) && !isBlockScopedNameDeclaredBeforeUse(declaration, errorLocation)) {
-                if (result.flags & 2) {
+            if (!(declaration.flags & 4194304 /* Ambient */) && !isBlockScopedNameDeclaredBeforeUse(declaration, errorLocation)) {
+                if (result.flags & 2 /* BlockScopedVariable */) {
                     error(errorLocation, ts.Diagnostics.Block_scoped_variable_0_used_before_its_declaration, ts.declarationNameToString(ts.getNameOfDeclaration(declaration)));
                 }
-                else if (result.flags & 32) {
+                else if (result.flags & 32 /* Class */) {
                     error(errorLocation, ts.Diagnostics.Class_0_used_before_its_declaration, ts.declarationNameToString(ts.getNameOfDeclaration(declaration)));
                 }
-                else if (result.flags & 256) {
+                else if (result.flags & 256 /* RegularEnum */) {
                     error(errorLocation, ts.Diagnostics.Enum_0_used_before_its_declaration, ts.declarationNameToString(ts.getNameOfDeclaration(declaration)));
                 }
             }
         }
+        /* Starting from 'initial' node walk up the parent chain until 'stopAt' node is reached.
+         * If at any point current node is equal to 'parent' node - return true.
+         * Return false if 'stopAt' node is reached or isFunctionLike(current) === true.
+         */
         function isSameScopeDescendentOf(initial, parent, stopAt) {
             return !!parent && !!ts.findAncestor(initial, function (n) { return n === stopAt || ts.isFunctionLike(n) ? "quit" : n === parent; });
         }
         function getAnyImportSyntax(node) {
             switch (node.kind) {
-                case 243:
+                case 243 /* ImportEqualsDeclaration */:
                     return node;
-                case 245:
+                case 245 /* ImportClause */:
                     return node.parent;
-                case 246:
+                case 246 /* NamespaceImport */:
                     return node.parent.parent;
-                case 248:
+                case 248 /* ImportSpecifier */:
                     return node.parent.parent.parent;
                 default:
                     return undefined;
@@ -22791,37 +30583,48 @@ var ts;
             return ts.find(symbol.declarations, ts.isAliasSymbolDeclaration);
         }
         function getTargetOfImportEqualsDeclaration(node, dontResolveAlias) {
-            if (node.moduleReference.kind === 254) {
+            if (node.moduleReference.kind === 254 /* ExternalModuleReference */) {
                 return resolveExternalModuleSymbol(resolveExternalModuleName(node, ts.getExternalModuleImportEqualsDeclarationExpression(node)));
             }
             return getSymbolOfPartOfRightHandSideOfImportEquals(node.moduleReference, dontResolveAlias);
         }
         function resolveExportByName(moduleSymbol, name, dontResolveAlias) {
-            var exportValue = moduleSymbol.exports.get("export=");
+            var exportValue = moduleSymbol.exports.get("export=" /* ExportEquals */);
             return exportValue
                 ? getPropertyOfType(getTypeOfSymbol(exportValue), name)
                 : resolveSymbol(moduleSymbol.exports.get(name), dontResolveAlias);
         }
         function isSyntacticDefault(node) {
-            return ((ts.isExportAssignment(node) && !node.isExportEquals) || ts.hasModifier(node, 512) || ts.isExportSpecifier(node));
+            return ((ts.isExportAssignment(node) && !node.isExportEquals) || ts.hasModifier(node, 512 /* Default */) || ts.isExportSpecifier(node));
         }
         function canHaveSyntheticDefault(file, moduleSymbol, dontResolveAlias) {
             if (!allowSyntheticDefaultImports) {
                 return false;
             }
+            // Declaration files (and ambient modules)
             if (!file || file.isDeclarationFile) {
-                var defaultExportSymbol = resolveExportByName(moduleSymbol, "default", true);
+                // Definitely cannot have a synthetic default if they have a syntactic default member specified
+                var defaultExportSymbol = resolveExportByName(moduleSymbol, "default" /* Default */, /*dontResolveAlias*/ true); // Dont resolve alias because we want the immediately exported symbol's declaration
                 if (defaultExportSymbol && ts.some(defaultExportSymbol.declarations, isSyntacticDefault)) {
                     return false;
                 }
+                // It _might_ still be incorrect to assume there is no __esModule marker on the import at runtime, even if there is no `default` member
+                // So we check a bit more,
                 if (resolveExportByName(moduleSymbol, ts.escapeLeadingUnderscores("__esModule"), dontResolveAlias)) {
+                    // If there is an `__esModule` specified in the declaration (meaning someone explicitly added it or wrote it in their code),
+                    // it definitely is a module and does not have a synthetic default
                     return false;
                 }
+                // There are _many_ declaration files not written with esmodules in mind that still get compiled into a format with __esModule set
+                // Meaning there may be no default at runtime - however to be on the permissive side, we allow access to a synthetic default member
+                // as there is no marker to indicate if the accompanying JS has `__esModule` or not, or is even native esm
                 return true;
             }
+            // TypeScript files never have a synthetic default (as they are always emitted with an __esModule marker) _unless_ they contain an export= statement
             if (!ts.isSourceFileJavaScript(file)) {
                 return hasExportAssignmentSymbol(moduleSymbol);
             }
+            // JS files have a synthetic default if they do not contain ES2015+ module syntax (export = is not valid in js) _and_ do not have an __esModule marker
             return !file.externalModuleIndicator && !resolveExportByName(moduleSymbol, ts.escapeLeadingUnderscores("__esModule"), dontResolveAlias);
         }
         function getTargetOfImportClause(node, dontResolveAlias) {
@@ -22832,14 +30635,15 @@ var ts;
                     exportDefaultSymbol = moduleSymbol;
                 }
                 else {
-                    exportDefaultSymbol = resolveExportByName(moduleSymbol, "default", dontResolveAlias);
+                    exportDefaultSymbol = resolveExportByName(moduleSymbol, "default" /* Default */, dontResolveAlias);
                 }
-                var file_2 = ts.find(moduleSymbol.declarations, ts.isSourceFile);
-                var hasSyntheticDefault = canHaveSyntheticDefault(file_2, moduleSymbol, dontResolveAlias);
+                var file = ts.find(moduleSymbol.declarations, ts.isSourceFile);
+                var hasSyntheticDefault = canHaveSyntheticDefault(file, moduleSymbol, dontResolveAlias);
                 if (!exportDefaultSymbol && !hasSyntheticDefault) {
                     error(node.name, ts.Diagnostics.Module_0_has_no_default_export, symbolToString(moduleSymbol));
                 }
                 else if (hasSyntheticDefault) {
+                    // per emit behavior, a synthetic default overrides a "real" .default member if `__esModule` is not present
                     return resolveExternalModuleSymbol(moduleSymbol, dontResolveAlias) || resolveSymbol(moduleSymbol, dontResolveAlias);
                 }
                 return exportDefaultSymbol;
@@ -22849,11 +30653,29 @@ var ts;
             var moduleSpecifier = node.parent.parent.moduleSpecifier;
             return resolveESModuleSymbol(resolveExternalModuleName(node, moduleSpecifier), moduleSpecifier, dontResolveAlias);
         }
+        // This function creates a synthetic symbol that combines the value side of one symbol with the
+        // type/namespace side of another symbol. Consider this example:
+        //
+        //   declare module graphics {
+        //       interface Point {
+        //           x: number;
+        //           y: number;
+        //       }
+        //   }
+        //   declare var graphics: {
+        //       Point: new (x: number, y: number) => graphics.Point;
+        //   }
+        //   declare module "graphics" {
+        //       export = graphics;
+        //   }
+        //
+        // An 'import { Point } from "graphics"' needs to create a symbol that combines the value side 'Point'
+        // property with the type/namespace side interface 'Point'.
         function combineValueAndTypeSymbols(valueSymbol, typeSymbol) {
             if (valueSymbol === unknownSymbol && typeSymbol === unknownSymbol) {
                 return unknownSymbol;
             }
-            if (valueSymbol.flags & (67901928 | 1920)) {
+            if (valueSymbol.flags & (67901928 /* Type */ | 1920 /* Namespace */)) {
                 return valueSymbol;
             }
             var result = createSymbol(valueSymbol.flags | typeSymbol.flags, valueSymbol.escapedName);
@@ -22868,21 +30690,21 @@ var ts;
             return result;
         }
         function getExportOfModule(symbol, name, dontResolveAlias) {
-            if (symbol.flags & 1536) {
+            if (symbol.flags & 1536 /* Module */) {
                 return resolveSymbol(getExportsOfSymbol(symbol).get(name), dontResolveAlias);
             }
         }
         function getPropertyOfVariable(symbol, name) {
-            if (symbol.flags & 3) {
+            if (symbol.flags & 3 /* Variable */) {
                 var typeAnnotation = symbol.valueDeclaration.type;
                 if (typeAnnotation) {
-                    return resolveSymbol(getPropertyOfType(getTypeFromTypeNode(typeAnnotation), name));
+                    return resolveSymbol(getPropertyOfType(getTypeFromTypeNode(typeAnnotation), name)); // TODO: GH#18217
                 }
             }
         }
         function getExternalModuleMember(node, specifier, dontResolveAlias) {
             if (dontResolveAlias === void 0) { dontResolveAlias = false; }
-            var moduleSymbol = resolveExternalModuleName(node, node.moduleSpecifier);
+            var moduleSymbol = resolveExternalModuleName(node, node.moduleSpecifier); // TODO: GH#18217
             var targetSymbol = resolveESModuleSymbol(moduleSymbol, node.moduleSpecifier, dontResolveAlias);
             if (targetSymbol) {
                 var name = specifier.propertyName || specifier.name;
@@ -22891,15 +30713,18 @@ var ts;
                         return moduleSymbol;
                     }
                     var symbolFromVariable = void 0;
-                    if (moduleSymbol && moduleSymbol.exports && moduleSymbol.exports.get("export=")) {
+                    // First check if module was specified with "export=". If so, get the member from the resolved type
+                    if (moduleSymbol && moduleSymbol.exports && moduleSymbol.exports.get("export=" /* ExportEquals */)) {
                         symbolFromVariable = getPropertyOfType(getTypeOfSymbol(targetSymbol), name.escapedText);
                     }
                     else {
                         symbolFromVariable = getPropertyOfVariable(targetSymbol, name.escapedText);
                     }
+                    // if symbolFromVariable is export - get its final target
                     symbolFromVariable = resolveSymbol(symbolFromVariable, dontResolveAlias);
                     var symbolFromModule = getExportOfModule(targetSymbol, name.escapedText, dontResolveAlias);
-                    if (!symbolFromModule && allowSyntheticDefaultImports && name.escapedText === "default") {
+                    // If the export member we're looking for is default, and there is no real default but allowSyntheticDefaultImports is on, return the entire module as the default
+                    if (!symbolFromModule && allowSyntheticDefaultImports && name.escapedText === "default" /* Default */) {
                         symbolFromModule = resolveExternalModuleSymbol(moduleSymbol, dontResolveAlias) || resolveSymbol(moduleSymbol, dontResolveAlias);
                     }
                     var symbol = symbolFromModule && symbolFromVariable && symbolFromModule !== symbolFromVariable ?
@@ -22929,14 +30754,14 @@ var ts;
         function getTargetOfExportSpecifier(node, meaning, dontResolveAlias) {
             return node.parent.parent.moduleSpecifier ?
                 getExternalModuleMember(node.parent.parent, node, dontResolveAlias) :
-                resolveEntityName(node.propertyName || node.name, meaning, false, dontResolveAlias);
+                resolveEntityName(node.propertyName || node.name, meaning, /*ignoreErrors*/ false, dontResolveAlias);
         }
         function getTargetOfExportAssignment(node, dontResolveAlias) {
             var expression = (ts.isExportAssignment(node) ? node.expression : node.right);
             if (ts.isClassExpression(expression)) {
                 return checkExpression(expression).symbol;
             }
-            var aliasLike = resolveEntityName(expression, 67216319 | 67901928 | 1920, true, dontResolveAlias);
+            var aliasLike = resolveEntityName(expression, 67216319 /* Value */ | 67901928 /* Type */ | 1920 /* Namespace */, /*ignoreErrors*/ true, dontResolveAlias);
             if (aliasLike) {
                 return aliasLike;
             }
@@ -22946,36 +30771,40 @@ var ts;
         function getTargetOfAliasDeclaration(node, dontRecursivelyResolve) {
             if (dontRecursivelyResolve === void 0) { dontRecursivelyResolve = false; }
             switch (node.kind) {
-                case 243:
+                case 243 /* ImportEqualsDeclaration */:
                     return getTargetOfImportEqualsDeclaration(node, dontRecursivelyResolve);
-                case 245:
+                case 245 /* ImportClause */:
                     return getTargetOfImportClause(node, dontRecursivelyResolve);
-                case 246:
+                case 246 /* NamespaceImport */:
                     return getTargetOfNamespaceImport(node, dontRecursivelyResolve);
-                case 248:
+                case 248 /* ImportSpecifier */:
                     return getTargetOfImportSpecifier(node, dontRecursivelyResolve);
-                case 252:
-                    return getTargetOfExportSpecifier(node, 67216319 | 67901928 | 1920, dontRecursivelyResolve);
-                case 249:
-                case 200:
+                case 252 /* ExportSpecifier */:
+                    return getTargetOfExportSpecifier(node, 67216319 /* Value */ | 67901928 /* Type */ | 1920 /* Namespace */, dontRecursivelyResolve);
+                case 249 /* ExportAssignment */:
+                case 200 /* BinaryExpression */:
                     return getTargetOfExportAssignment(node, dontRecursivelyResolve);
-                case 242:
+                case 242 /* NamespaceExportDeclaration */:
                     return getTargetOfNamespaceExportDeclaration(node, dontRecursivelyResolve);
                 default:
                     return ts.Debug.fail();
             }
         }
+        /**
+         * Indicates that a symbol is an alias that does not merge with a local declaration.
+         * OR Is a JSContainer which may merge an alias with a local declaration
+         */
         function isNonLocalAlias(symbol, excludes) {
-            if (excludes === void 0) { excludes = 67216319 | 67901928 | 1920; }
+            if (excludes === void 0) { excludes = 67216319 /* Value */ | 67901928 /* Type */ | 1920 /* Namespace */; }
             if (!symbol)
                 return false;
-            return (symbol.flags & (2097152 | excludes)) === 2097152 || !!(symbol.flags & 2097152 && symbol.flags & 67108864);
+            return (symbol.flags & (2097152 /* Alias */ | excludes)) === 2097152 /* Alias */ || !!(symbol.flags & 2097152 /* Alias */ && symbol.flags & 67108864 /* JSContainer */);
         }
         function resolveSymbol(symbol, dontResolveAlias) {
             return !dontResolveAlias && isNonLocalAlias(symbol) ? resolveAlias(symbol) : symbol;
         }
         function resolveAlias(symbol) {
-            ts.Debug.assert((symbol.flags & 2097152) !== 0, "Should only get Alias here.");
+            ts.Debug.assert((symbol.flags & 2097152 /* Alias */) !== 0, "Should only get Alias here.");
             var links = getSymbolLinks(symbol);
             if (!links.target) {
                 links.target = resolvingSymbol;
@@ -23000,12 +30829,15 @@ var ts;
             var target = resolveAlias(symbol);
             if (target) {
                 var markAlias = target === unknownSymbol ||
-                    ((target.flags & 67216319) && !isConstEnumOrConstEnumOnlyModule(target));
+                    ((target.flags & 67216319 /* Value */) && !isConstEnumOrConstEnumOnlyModule(target));
                 if (markAlias) {
                     markAliasSymbolAsReferenced(symbol);
                 }
             }
         }
+        // When an alias symbol is referenced, we need to mark the entity it references as referenced and in turn repeat that until
+        // we reach a non-alias or an exported entity (which is always considered referenced). We do this by checking the target of
+        // the alias as an expression (which recursively takes us back here if the target references another alias).
         function markAliasSymbolAsReferenced(symbol) {
             var links = getSymbolLinks(symbol);
             if (!links.referenced) {
@@ -23013,75 +30845,91 @@ var ts;
                 var node = getDeclarationOfAliasSymbol(symbol);
                 if (!node)
                     return ts.Debug.fail();
-                if (node.kind === 249) {
+                if (node.kind === 249 /* ExportAssignment */) {
+                    // export default <symbol>
                     checkExpressionCached(node.expression);
                 }
-                else if (node.kind === 252) {
+                else if (node.kind === 252 /* ExportSpecifier */) {
+                    // export { <symbol> } or export { <symbol> as foo }
                     checkExpressionCached(node.propertyName || node.name);
                 }
                 else if (ts.isInternalModuleImportEqualsDeclaration(node)) {
+                    // import foo = <symbol>
                     checkExpressionCached(node.moduleReference);
                 }
             }
         }
+        // This function is only for imports with entity names
         function getSymbolOfPartOfRightHandSideOfImportEquals(entityName, dontResolveAlias) {
-            if (entityName.kind === 71 && ts.isRightSideOfQualifiedNameOrPropertyAccess(entityName)) {
+            // There are three things we might try to look for. In the following examples,
+            // the search term is enclosed in |...|:
+            //
+            //     import a = |b|; // Namespace
+            //     import a = |b.c|; // Value, type, namespace
+            //     import a = |b.c|.d; // Namespace
+            if (entityName.kind === 71 /* Identifier */ && ts.isRightSideOfQualifiedNameOrPropertyAccess(entityName)) {
                 entityName = entityName.parent;
             }
-            if (entityName.kind === 71 || entityName.parent.kind === 146) {
-                return resolveEntityName(entityName, 1920, false, dontResolveAlias);
+            // Check for case 1 and 3 in the above example
+            if (entityName.kind === 71 /* Identifier */ || entityName.parent.kind === 146 /* QualifiedName */) {
+                return resolveEntityName(entityName, 1920 /* Namespace */, /*ignoreErrors*/ false, dontResolveAlias);
             }
             else {
-                ts.Debug.assert(entityName.parent.kind === 243);
-                return resolveEntityName(entityName, 67216319 | 67901928 | 1920, false, dontResolveAlias);
+                // Case 2 in above example
+                // entityName.kind could be a QualifiedName or a Missing identifier
+                ts.Debug.assert(entityName.parent.kind === 243 /* ImportEqualsDeclaration */);
+                return resolveEntityName(entityName, 67216319 /* Value */ | 67901928 /* Type */ | 1920 /* Namespace */, /*ignoreErrors*/ false, dontResolveAlias);
             }
         }
         function getFullyQualifiedName(symbol) {
             return symbol.parent ? getFullyQualifiedName(symbol.parent) + "." + symbolToString(symbol) : symbolToString(symbol);
         }
+        /**
+         * Resolves a qualified name and any involved aliases.
+         */
         function resolveEntityName(name, meaning, ignoreErrors, dontResolveAlias, location) {
             if (ts.nodeIsMissing(name)) {
                 return undefined;
             }
-            var namespaceMeaning = 1920 | (ts.isInJavaScriptFile(name) ? meaning & 67216319 : 0);
+            var namespaceMeaning = 1920 /* Namespace */ | (ts.isInJavaScriptFile(name) ? meaning & 67216319 /* Value */ : 0);
             var symbol;
-            if (name.kind === 71) {
+            if (name.kind === 71 /* Identifier */) {
                 var message = meaning === namespaceMeaning ? ts.Diagnostics.Cannot_find_namespace_0 : ts.Diagnostics.Cannot_find_name_0;
                 var symbolFromJSPrototype = ts.isInJavaScriptFile(name) ? resolveEntityNameFromJSSpecialAssignment(name, meaning) : undefined;
-                symbol = resolveName(location || name, name.escapedText, meaning, ignoreErrors || symbolFromJSPrototype ? undefined : message, name, true);
+                symbol = resolveName(location || name, name.escapedText, meaning, ignoreErrors || symbolFromJSPrototype ? undefined : message, name, /*isUse*/ true);
                 if (!symbol) {
                     return symbolFromJSPrototype;
                 }
             }
-            else if (name.kind === 146 || name.kind === 185) {
-                var left = name.kind === 146 ? name.left : name.expression;
-                var right = name.kind === 146 ? name.right : name.name;
-                var namespace_1 = resolveEntityName(left, namespaceMeaning, ignoreErrors, false, location);
-                if (!namespace_1 || ts.nodeIsMissing(right)) {
+            else if (name.kind === 146 /* QualifiedName */ || name.kind === 185 /* PropertyAccessExpression */) {
+                var left = name.kind === 146 /* QualifiedName */ ? name.left : name.expression;
+                var right = name.kind === 146 /* QualifiedName */ ? name.right : name.name;
+                var namespace = resolveEntityName(left, namespaceMeaning, ignoreErrors, /*dontResolveAlias*/ false, location);
+                if (!namespace || ts.nodeIsMissing(right)) {
                     return undefined;
                 }
-                else if (namespace_1 === unknownSymbol) {
-                    return namespace_1;
+                else if (namespace === unknownSymbol) {
+                    return namespace;
                 }
                 if (ts.isInJavaScriptFile(name)) {
-                    if (namespace_1.valueDeclaration &&
-                        ts.isVariableDeclaration(namespace_1.valueDeclaration) &&
-                        namespace_1.valueDeclaration.initializer &&
-                        isCommonJsRequire(namespace_1.valueDeclaration.initializer)) {
-                        var moduleName = namespace_1.valueDeclaration.initializer.arguments[0];
+                    if (namespace.valueDeclaration &&
+                        ts.isVariableDeclaration(namespace.valueDeclaration) &&
+                        namespace.valueDeclaration.initializer &&
+                        isCommonJsRequire(namespace.valueDeclaration.initializer)) {
+                        var moduleName = namespace.valueDeclaration.initializer.arguments[0];
                         var moduleSym = resolveExternalModuleName(moduleName, moduleName);
                         if (moduleSym) {
                             var resolvedModuleSymbol = resolveExternalModuleSymbol(moduleSym);
                             if (resolvedModuleSymbol) {
-                                namespace_1 = resolvedModuleSymbol;
+                                namespace = resolvedModuleSymbol;
                             }
                         }
                     }
                 }
-                symbol = getSymbol(getExportsOfSymbol(namespace_1), right.escapedText, meaning);
+                symbol = getSymbol(getExportsOfSymbol(namespace), right.escapedText, meaning);
                 if (!symbol) {
                     if (!ignoreErrors) {
-                        error(right, ts.Diagnostics.Namespace_0_has_no_exported_member_1, getFullyQualifiedName(namespace_1), ts.declarationNameToString(right));
+                        error(right, ts.Diagnostics.Namespace_0_has_no_exported_member_1, getFullyQualifiedName(namespace), ts.declarationNameToString(right));
                     }
                     return undefined;
                 }
@@ -23089,26 +30937,32 @@ var ts;
             else {
                 throw ts.Debug.assertNever(name, "Unknown entity name kind.");
             }
-            ts.Debug.assert((ts.getCheckFlags(symbol) & 1) === 0, "Should never get an instantiated symbol here.");
+            ts.Debug.assert((ts.getCheckFlags(symbol) & 1 /* Instantiated */) === 0, "Should never get an instantiated symbol here.");
             return (symbol.flags & meaning) || dontResolveAlias ? symbol : resolveAlias(symbol);
         }
+        /**
+         * 1. For prototype-property methods like `A.prototype.m = function () ...`, try to resolve names in the scope of `A` too.
+         * Note that prototype-property assignment to locations outside the current file (eg globals) doesn't work, so
+         * name resolution won't work either.
+         * 2. For property assignments like `{ x: function f () { } }`, try to resolve names in the scope of `f` too.
+         */
         function resolveEntityNameFromJSSpecialAssignment(name, meaning) {
             if (isJSDocTypeReference(name.parent)) {
                 var secondaryLocation = getJSSpecialAssignmentLocation(name.parent);
                 if (secondaryLocation) {
-                    return resolveName(secondaryLocation, name.escapedText, meaning, undefined, name, true);
+                    return resolveName(secondaryLocation, name.escapedText, meaning, /*nameNotFoundMessage*/ undefined, name, /*isUse*/ true);
                 }
             }
         }
         function getJSSpecialAssignmentLocation(node) {
-            var typeAlias = ts.findAncestor(node, function (node) { return !(ts.isJSDocNode(node) || node.flags & 2097152) ? "quit" : ts.isJSDocTypeAlias(node); });
+            var typeAlias = ts.findAncestor(node, function (node) { return !(ts.isJSDocNode(node) || node.flags & 2097152 /* JSDoc */) ? "quit" : ts.isJSDocTypeAlias(node); });
             if (typeAlias) {
                 return;
             }
             var host = ts.getJSDocHost(node);
             if (ts.isExpressionStatement(host) &&
                 ts.isBinaryExpression(host.expression) &&
-                ts.getSpecialPropertyAssignmentKind(host.expression) === 3) {
+                ts.getSpecialPropertyAssignmentKind(host.expression) === 3 /* PrototypeProperty */) {
                 var symbol = getSymbolOfNode(host.expression.left);
                 return symbol && symbol.parent.valueDeclaration;
             }
@@ -23137,22 +30991,24 @@ var ts;
                 var withoutAtTypePrefix = ts.removePrefix(moduleReference, "@types/");
                 error(errorNode, diag, withoutAtTypePrefix, moduleReference);
             }
-            var ambientModule = tryFindAmbientModule(moduleReference, true);
+            var ambientModule = tryFindAmbientModule(moduleReference, /*withAugmentations*/ true);
             if (ambientModule) {
                 return ambientModule;
             }
             var currentSourceFile = ts.getSourceFileOfNode(location);
-            var resolvedModule = ts.getResolvedModule(currentSourceFile, moduleReference);
+            var resolvedModule = ts.getResolvedModule(currentSourceFile, moduleReference); // TODO: GH#18217
             var resolutionDiagnostic = resolvedModule && ts.getResolutionDiagnostic(compilerOptions, resolvedModule);
             var sourceFile = resolvedModule && !resolutionDiagnostic && host.getSourceFile(resolvedModule.resolvedFileName);
             if (sourceFile) {
                 if (sourceFile.symbol) {
                     if (resolvedModule.isExternalLibraryImport && !ts.extensionIsTypeScript(resolvedModule.extension)) {
-                        errorOnImplicitAnyModule(false, errorNode, resolvedModule, moduleReference);
+                        errorOnImplicitAnyModule(/*isError*/ false, errorNode, resolvedModule, moduleReference);
                     }
+                    // merged symbol is module declaration symbol combined with all augmentations
                     return getMergedSymbol(sourceFile.symbol);
                 }
                 if (moduleNotFoundError) {
+                    // report errors only if it was requested
                     error(errorNode, ts.Diagnostics.File_0_is_not_a_module, sourceFile.fileName);
                 }
                 return undefined;
@@ -23163,23 +31019,26 @@ var ts;
                     return getMergedSymbol(pattern.symbol);
                 }
             }
+            // May be an untyped module. If so, ignore resolutionDiagnostic.
             if (resolvedModule && !ts.resolutionExtensionIsTypeScriptOrJson(resolvedModule.extension) && resolutionDiagnostic === undefined || resolutionDiagnostic === ts.Diagnostics.Could_not_find_a_declaration_file_for_module_0_1_implicitly_has_an_any_type) {
                 if (isForAugmentation) {
                     var diag = ts.Diagnostics.Invalid_module_name_in_augmentation_Module_0_resolves_to_an_untyped_module_at_1_which_cannot_be_augmented;
                     error(errorNode, diag, moduleReference, resolvedModule.resolvedFileName);
                 }
                 else {
-                    errorOnImplicitAnyModule(noImplicitAny && !!moduleNotFoundError, errorNode, resolvedModule, moduleReference);
+                    errorOnImplicitAnyModule(/*isError*/ noImplicitAny && !!moduleNotFoundError, errorNode, resolvedModule, moduleReference);
                 }
+                // Failed imports and untyped modules are both treated in an untyped manner; only difference is whether we give a diagnostic first.
                 return undefined;
             }
             if (moduleNotFoundError) {
+                // For relative paths, see if this was possibly a projectReference redirect
                 if (ts.pathIsRelative(moduleReference)) {
                     var sourceFile_1 = ts.getSourceFileOfNode(location);
                     var redirects = sourceFile_1.redirectedReferences;
                     if (redirects) {
                         var normalizedTargetPath = ts.getNormalizedAbsolutePath(moduleReference, ts.getDirectoryPath(sourceFile_1.fileName));
-                        for (var _i = 0, _a = [".ts", ".tsx"]; _i < _a.length; _i++) {
+                        for (var _i = 0, _a = [".ts" /* Ts */, ".tsx" /* Tsx */]; _i < _a.length; _i++) {
                             var ext = _a[_i];
                             var probePath = normalizedTargetPath + ext;
                             if (redirects.indexOf(probePath) >= 0) {
@@ -23207,11 +31066,12 @@ var ts;
         }
         function errorOnImplicitAnyModule(isError, errorNode, _a, moduleReference) {
             var packageId = _a.packageId, resolvedFileName = _a.resolvedFileName;
-            var errorInfo = packageId && ts.chainDiagnosticMessages(undefined, ts.Diagnostics.Try_npm_install_types_Slash_0_if_it_exists_or_add_a_new_declaration_d_ts_file_containing_declare_module_0, ts.getMangledNameForScopedPackage(packageId.name));
+            var errorInfo = packageId && ts.chainDiagnosticMessages(
+            /*details*/ undefined, ts.Diagnostics.Try_npm_install_types_Slash_0_if_it_exists_or_add_a_new_declaration_d_ts_file_containing_declare_module_0, ts.getMangledNameForScopedPackage(packageId.name));
             errorOrSuggestion(isError, errorNode, ts.chainDiagnosticMessages(errorInfo, ts.Diagnostics.Could_not_find_a_declaration_file_for_module_0_1_implicitly_has_an_any_type, moduleReference, resolvedFileName));
         }
         function resolveExternalModuleSymbol(moduleSymbol, dontResolveAlias) {
-            return moduleSymbol && getMergedSymbol(getCommonJsExportEquals(resolveSymbol(moduleSymbol.exports.get("export="), dontResolveAlias), moduleSymbol)) || moduleSymbol;
+            return moduleSymbol && getMergedSymbol(getCommonJsExportEquals(resolveSymbol(moduleSymbol.exports.get("export=" /* ExportEquals */), dontResolveAlias), moduleSymbol)) || moduleSymbol;
         }
         function getCommonJsExportEquals(exported, moduleSymbol) {
             if (!exported || moduleSymbol.exports.size === 1) {
@@ -23219,20 +31079,23 @@ var ts;
             }
             var merged = cloneSymbol(exported);
             if (merged.exports === undefined) {
-                merged.flags = merged.flags | 512;
+                merged.flags = merged.flags | 512 /* ValueModule */;
                 merged.exports = ts.createSymbolTable();
             }
             moduleSymbol.exports.forEach(function (s, name) {
-                if (name === "export=")
+                if (name === "export=" /* ExportEquals */)
                     return;
                 merged.exports.set(name, merged.exports.has(name) ? mergeSymbol(merged.exports.get(name), s) : s);
             });
             return merged;
         }
+        // An external module with an 'export =' declaration may be referenced as an ES6 module provided the 'export ='
+        // references a symbol that is at least declared as a module or a variable. The target of the 'export =' may
+        // combine other declarations with the module or variable (e.g. a class/module, function/module, interface/variable).
         function resolveESModuleSymbol(moduleSymbol, referencingLocation, dontResolveAlias) {
             var symbol = resolveExternalModuleSymbol(moduleSymbol, dontResolveAlias);
             if (!dontResolveAlias && symbol) {
-                if (!(symbol.flags & (1536 | 3))) {
+                if (!(symbol.flags & (1536 /* Module */ | 3 /* Variable */))) {
                     error(referencingLocation, ts.Diagnostics.Module_0_resolves_to_a_non_module_entity_and_cannot_be_imported_using_this_construct, symbolToString(moduleSymbol));
                     return symbol;
                 }
@@ -23241,12 +31104,13 @@ var ts;
                     if ((ts.isImportDeclaration(referenceParent) && ts.getNamespaceDeclarationNode(referenceParent)) ||
                         ts.isImportCall(referenceParent)) {
                         var type = getTypeOfSymbol(symbol);
-                        var sigs = getSignaturesOfStructuredType(type, 0);
+                        var sigs = getSignaturesOfStructuredType(type, 0 /* Call */);
                         if (!sigs || !sigs.length) {
-                            sigs = getSignaturesOfStructuredType(type, 1);
+                            sigs = getSignaturesOfStructuredType(type, 1 /* Construct */);
                         }
                         if (sigs && sigs.length) {
                             var moduleType = getTypeWithSyntheticDefaultImportType(type, symbol, moduleSymbol);
+                            // Create a new symbol which has the module's type less the call and construct signatures
                             var result = createSymbol(symbol.flags, symbol.escapedName);
                             result.declarations = symbol.declarations ? symbol.declarations.slice() : [];
                             result.parent = symbol.parent;
@@ -23260,7 +31124,7 @@ var ts;
                                 result.members = ts.cloneMap(symbol.members);
                             if (symbol.exports)
                                 result.exports = ts.cloneMap(symbol.exports);
-                            var resolvedModuleType = resolveStructuredTypeMembers(moduleType);
+                            var resolvedModuleType = resolveStructuredTypeMembers(moduleType); // Should already be resolved from the signature checks above
                             result.type = createAnonymousType(result, resolvedModuleType.members, ts.emptyArray, ts.emptyArray, resolvedModuleType.stringIndexInfo, resolvedModuleType.numberIndexInfo);
                             return result;
                         }
@@ -23270,7 +31134,7 @@ var ts;
             return symbol;
         }
         function hasExportAssignmentSymbol(moduleSymbol) {
-            return moduleSymbol.exports.get("export=") !== undefined;
+            return moduleSymbol.exports.get("export=" /* ExportEquals */) !== undefined;
         }
         function getExportsOfModuleAsArray(moduleSymbol) {
             return symbolsToArray(getExportsOfModule(moduleSymbol));
@@ -23299,22 +31163,26 @@ var ts;
                 return undefined;
             }
             var type = getTypeOfSymbol(exportEquals);
-            return type.flags & 32764 ? undefined : getPropertyOfType(type, memberName);
+            return type.flags & 32764 /* Primitive */ ? undefined : getPropertyOfType(type, memberName);
         }
         function getExportsOfSymbol(symbol) {
-            return symbol.flags & 32 ? getResolvedMembersOrExportsOfSymbol(symbol, "resolvedExports") :
-                symbol.flags & 1536 ? getExportsOfModule(symbol) :
+            return symbol.flags & 32 /* Class */ ? getResolvedMembersOrExportsOfSymbol(symbol, "resolvedExports" /* resolvedExports */) :
+                symbol.flags & 1536 /* Module */ ? getExportsOfModule(symbol) :
                     symbol.exports || emptySymbols;
         }
         function getExportsOfModule(moduleSymbol) {
             var links = getSymbolLinks(moduleSymbol);
             return links.resolvedExports || (links.resolvedExports = getExportsOfModuleWorker(moduleSymbol));
         }
+        /**
+         * Extends one symbol table with another while collecting information on name collisions for error message generation into the `lookupTable` argument
+         * Not passing `lookupTable` and `exportNode` disables this collection, and just extends the tables
+         */
         function extendExportSymbols(target, source, lookupTable, exportNode) {
             if (!source)
                 return;
             source.forEach(function (sourceSymbol, id) {
-                if (id === "default")
+                if (id === "default" /* Default */)
                     return;
                 var targetSymbol = target.get(id);
                 if (!targetSymbol) {
@@ -23338,14 +31206,18 @@ var ts;
         }
         function getExportsOfModuleWorker(moduleSymbol) {
             var visitedSymbols = [];
+            // A module defined by an 'export=' consists on one export that needs to be resolved
             moduleSymbol = resolveExternalModuleSymbol(moduleSymbol);
             return visit(moduleSymbol) || emptySymbols;
+            // The ES6 spec permits export * declarations in a module to circularly reference the module itself. For example,
+            // module 'a' can 'export * from "b"' and 'b' can 'export * from "a"' without error.
             function visit(symbol) {
-                if (!(symbol && symbol.flags & 1952 && ts.pushIfUnique(visitedSymbols, symbol))) {
+                if (!(symbol && symbol.flags & 1952 /* HasExports */ && ts.pushIfUnique(visitedSymbols, symbol))) {
                     return;
                 }
                 var symbols = ts.cloneMap(symbol.exports);
-                var exportStars = symbol.exports.get("__export");
+                // All export * declarations are collected in an __export symbol by the binder
+                var exportStars = symbol.exports.get("__export" /* ExportStar */);
                 if (exportStars) {
                     var nestedSymbols = ts.createSymbolTable();
                     var lookupTable_1 = ts.createMap();
@@ -23357,6 +31229,7 @@ var ts;
                     }
                     lookupTable_1.forEach(function (_a, id) {
                         var exportsWithDuplicate = _a.exportsWithDuplicate;
+                        // It's not an error if the file with multiple `export *`s with duplicate names exports a member with that name itself
                         if (id === "export=" || !(exportsWithDuplicate && exportsWithDuplicate.length) || symbols.has(id)) {
                             return;
                         }
@@ -23380,6 +31253,10 @@ var ts;
         function getParentOfSymbol(symbol) {
             return getMergedSymbol(symbol.parent && getLateBoundSymbol(symbol.parent));
         }
+        /**
+         * Attempts to find the symbol corresponding to the container a symbol is in - usually this
+         * is just its' `.parent`, but for locals, this value is `undefined`
+         */
         function getContainerOfSymbol(symbol) {
             var container = getParentOfSymbol(symbol);
             if (container) {
@@ -23394,6 +31271,7 @@ var ts;
         }
         function getAliasForSymbolInContainer(container, symbol) {
             if (container === getParentOfSymbol(symbol)) {
+                // fast path, `symbol` is either already the alias or isn't aliased
                 return symbol;
             }
             var exports = getExportsOfSymbol(container);
@@ -23413,18 +31291,18 @@ var ts;
             }
         }
         function getExportSymbolOfValueSymbolIfExported(symbol) {
-            return symbol && (symbol.flags & 1048576) !== 0
+            return symbol && (symbol.flags & 1048576 /* ExportValue */) !== 0
                 ? getMergedSymbol(symbol.exportSymbol)
                 : symbol;
         }
         function symbolIsValue(symbol) {
-            return !!(symbol.flags & 67216319 || symbol.flags & 2097152 && resolveAlias(symbol).flags & 67216319);
+            return !!(symbol.flags & 67216319 /* Value */ || symbol.flags & 2097152 /* Alias */ && resolveAlias(symbol).flags & 67216319 /* Value */);
         }
         function findConstructorDeclaration(node) {
             var members = node.members;
-            for (var _i = 0, members_2 = members; _i < members_2.length; _i++) {
-                var member = members_2[_i];
-                if (member.kind === 155 && ts.nodeIsPresent(member.body)) {
+            for (var _i = 0, members_1 = members; _i < members_1.length; _i++) {
+                var member = members_1[_i];
+                if (member.kind === 155 /* Constructor */ && ts.nodeIsPresent(member.body)) {
                     return member;
                 }
             }
@@ -23442,12 +31320,12 @@ var ts;
         }
         function createBooleanType(trueFalseTypes) {
             var type = getUnionType(trueFalseTypes);
-            type.flags |= 16;
+            type.flags |= 16 /* Boolean */;
             type.intrinsicName = "boolean";
             return type;
         }
         function createObjectType(objectFlags, symbol) {
-            var type = createType(131072);
+            var type = createType(131072 /* Object */);
             type.objectFlags = objectFlags;
             type.symbol = symbol;
             return type;
@@ -23455,11 +31333,15 @@ var ts;
         function createTypeofType() {
             return getUnionType(ts.arrayFrom(typeofEQFacts.keys(), getLiteralType));
         }
+        // A reserved member name starts with two underscores, but the third character cannot be an underscore
+        // or the @ symbol. A third underscore indicates an escaped form of an identifer that started
+        // with at least two underscores. The @ character indicates that the name is denoted by a well known ES
+        // Symbol instance.
         function isReservedMemberName(name) {
-            return name.charCodeAt(0) === 95 &&
-                name.charCodeAt(1) === 95 &&
-                name.charCodeAt(2) !== 95 &&
-                name.charCodeAt(2) !== 64;
+            return name.charCodeAt(0) === 95 /* _ */ &&
+                name.charCodeAt(1) === 95 /* _ */ &&
+                name.charCodeAt(2) !== 95 /* _ */ &&
+                name.charCodeAt(2) !== 64 /* at */;
         }
         function getNamedMembers(members) {
             var result;
@@ -23486,22 +31368,24 @@ var ts;
             return type;
         }
         function createAnonymousType(symbol, members, callSignatures, constructSignatures, stringIndexInfo, numberIndexInfo) {
-            return setStructuredTypeMembers(createObjectType(16, symbol), members, callSignatures, constructSignatures, stringIndexInfo, numberIndexInfo);
+            return setStructuredTypeMembers(createObjectType(16 /* Anonymous */, symbol), members, callSignatures, constructSignatures, stringIndexInfo, numberIndexInfo);
         }
         function forEachSymbolTableInScope(enclosingDeclaration, callback) {
             var result;
             for (var location = enclosingDeclaration; location; location = location.parent) {
+                // Locals of a source file are not in scope (because they get merged into the global symbol table)
                 if (location.locals && !isGlobalSourceFile(location)) {
                     if (result = callback(location.locals)) {
                         return result;
                     }
                 }
                 switch (location.kind) {
-                    case 274:
+                    case 274 /* SourceFile */:
                         if (!ts.isExternalOrCommonJsModule(location)) {
                             break;
                         }
-                    case 239:
+                    // falls through
+                    case 239 /* ModuleDeclaration */:
                         if (result = callback(getSymbolOfNode(location).exports)) {
                             return result;
                         }
@@ -23511,7 +31395,8 @@ var ts;
             return callback(globals);
         }
         function getQualifiedLeftMeaning(rightMeaning) {
-            return rightMeaning === 67216319 ? 67216319 : 1920;
+            // If we are looking in value space, the parent meaning is value, other wise it is namespace
+            return rightMeaning === 67216319 /* Value */ ? 67216319 /* Value */ : 1920 /* Namespace */;
         }
         function getAccessibleSymbolChain(symbol, enclosingDeclaration, meaning, useOnlyExternalAliasing, visitedSymbolTablesMap) {
             if (visitedSymbolTablesMap === void 0) { visitedSymbolTablesMap = ts.createMap(); }
@@ -23524,6 +31409,9 @@ var ts;
                 visitedSymbolTablesMap.set(id, visitedSymbolTables = []);
             }
             return forEachSymbolTableInScope(enclosingDeclaration, getAccessibleSymbolChainFromSymbolTable);
+            /**
+             * @param {ignoreQualification} boolean Set when a symbol is being looked for through the exports of another symbol (meaning we have a route to qualify it already)
+             */
             function getAccessibleSymbolChainFromSymbolTable(symbols, ignoreQualification) {
                 if (!ts.pushIfUnique(visitedSymbolTables, symbols)) {
                     return undefined;
@@ -23533,36 +31421,46 @@ var ts;
                 return result;
             }
             function canQualifySymbol(symbolFromSymbolTable, meaning) {
+                // If the symbol is equivalent and doesn't need further qualification, this symbol is accessible
                 return !needsQualification(symbolFromSymbolTable, enclosingDeclaration, meaning) ||
+                    // If symbol needs qualification, make sure that parent is accessible, if it is then this symbol is accessible too
                     !!getAccessibleSymbolChain(symbolFromSymbolTable.parent, enclosingDeclaration, getQualifiedLeftMeaning(meaning), useOnlyExternalAliasing, visitedSymbolTablesMap);
             }
             function isAccessible(symbolFromSymbolTable, resolvedAliasSymbol, ignoreQualification) {
                 return symbol === (resolvedAliasSymbol || symbolFromSymbolTable) &&
+                    // if the symbolFromSymbolTable is not external module (it could be if it was determined as ambient external module and would be in globals table)
+                    // and if symbolFromSymbolTable or alias resolution matches the symbol,
+                    // check the symbol can be qualified, it is only then this symbol is accessible
                     !ts.some(symbolFromSymbolTable.declarations, hasNonGlobalAugmentationExternalModuleSymbol) &&
                     (ignoreQualification || canQualifySymbol(symbolFromSymbolTable, meaning));
             }
             function trySymbolTable(symbols, ignoreQualification) {
-                if (isAccessible(symbols.get(symbol.escapedName), undefined, ignoreQualification)) {
+                // If symbol is directly available by its name in the symbol table
+                if (isAccessible(symbols.get(symbol.escapedName), /*resolvedAliasSymbol*/ undefined, ignoreQualification)) {
                     return [symbol];
                 }
+                // Check if symbol is any of the alias
                 return ts.forEachEntry(symbols, function (symbolFromSymbolTable) {
-                    if (symbolFromSymbolTable.flags & 2097152
-                        && symbolFromSymbolTable.escapedName !== "export="
-                        && symbolFromSymbolTable.escapedName !== "default"
+                    if (symbolFromSymbolTable.flags & 2097152 /* Alias */
+                        && symbolFromSymbolTable.escapedName !== "export=" /* ExportEquals */
+                        && symbolFromSymbolTable.escapedName !== "default" /* Default */
                         && !(ts.isUMDExportSymbol(symbolFromSymbolTable) && enclosingDeclaration && ts.isExternalModule(ts.getSourceFileOfNode(enclosingDeclaration)))
+                        // If `!useOnlyExternalAliasing`, we can use any type of alias to get the name
                         && (!useOnlyExternalAliasing || ts.some(symbolFromSymbolTable.declarations, ts.isExternalModuleImportEqualsDeclaration))) {
                         var resolvedImportedSymbol = resolveAlias(symbolFromSymbolTable);
                         if (isAccessible(symbolFromSymbolTable, resolvedImportedSymbol, ignoreQualification)) {
                             return [symbolFromSymbolTable];
                         }
+                        // Look in the exported members, if we can find accessibleSymbolChain, symbol is accessible using this chain
+                        // but only if the symbolFromSymbolTable can be qualified
                         var candidateTable = getExportsOfSymbol(resolvedImportedSymbol);
-                        var accessibleSymbolsFromExports = candidateTable && getAccessibleSymbolChainFromSymbolTable(candidateTable, true);
+                        var accessibleSymbolsFromExports = candidateTable && getAccessibleSymbolChainFromSymbolTable(candidateTable, /*ignoreQualification*/ true);
                         if (accessibleSymbolsFromExports && canQualifySymbol(symbolFromSymbolTable, getQualifiedLeftMeaning(meaning))) {
                             return [symbolFromSymbolTable].concat(accessibleSymbolsFromExports);
                         }
                     }
                     if (symbolFromSymbolTable.escapedName === symbol.escapedName && symbolFromSymbolTable.exportSymbol) {
-                        if (isAccessible(getMergedSymbol(symbolFromSymbolTable.exportSymbol), undefined, ignoreQualification)) {
+                        if (isAccessible(getMergedSymbol(symbolFromSymbolTable.exportSymbol), /*aliasSymbol*/ undefined, ignoreQualification)) {
                             return [symbol];
                         }
                     }
@@ -23572,18 +31470,24 @@ var ts;
         function needsQualification(symbol, enclosingDeclaration, meaning) {
             var qualify = false;
             forEachSymbolTableInScope(enclosingDeclaration, function (symbolTable) {
+                // If symbol of this name is not available in the symbol table we are ok
                 var symbolFromSymbolTable = getMergedSymbol(symbolTable.get(symbol.escapedName));
                 if (!symbolFromSymbolTable) {
+                    // Continue to the next symbol table
                     return false;
                 }
+                // If the symbol with this name is present it should refer to the symbol
                 if (symbolFromSymbolTable === symbol) {
+                    // No need to qualify
                     return true;
                 }
-                symbolFromSymbolTable = (symbolFromSymbolTable.flags & 2097152 && !ts.getDeclarationOfKind(symbolFromSymbolTable, 252)) ? resolveAlias(symbolFromSymbolTable) : symbolFromSymbolTable;
+                // Qualify if the symbol from symbol table has same meaning as expected
+                symbolFromSymbolTable = (symbolFromSymbolTable.flags & 2097152 /* Alias */ && !ts.getDeclarationOfKind(symbolFromSymbolTable, 252 /* ExportSpecifier */)) ? resolveAlias(symbolFromSymbolTable) : symbolFromSymbolTable;
                 if (symbolFromSymbolTable.flags & meaning) {
                     qualify = true;
                     return true;
                 }
+                // Continue to the next symbol table
                 return false;
             });
             return qualify;
@@ -23593,10 +31497,10 @@ var ts;
                 for (var _i = 0, _a = symbol.declarations; _i < _a.length; _i++) {
                     var declaration = _a[_i];
                     switch (declaration.kind) {
-                        case 152:
-                        case 154:
-                        case 156:
-                        case 157:
+                        case 152 /* PropertyDeclaration */:
+                        case 154 /* MethodDeclaration */:
+                        case 156 /* GetAccessor */:
+                        case 157 /* SetAccessor */:
                             continue;
                         default:
                             return false;
@@ -23607,97 +31511,129 @@ var ts;
             return false;
         }
         function isTypeSymbolAccessible(typeSymbol, enclosingDeclaration) {
-            var access = isSymbolAccessible(typeSymbol, enclosingDeclaration, 67901928, false);
-            return access.accessibility === 0;
+            var access = isSymbolAccessible(typeSymbol, enclosingDeclaration, 67901928 /* Type */, /*shouldComputeAliasesToMakeVisible*/ false);
+            return access.accessibility === 0 /* Accessible */;
         }
         function isValueSymbolAccessible(typeSymbol, enclosingDeclaration) {
-            var access = isSymbolAccessible(typeSymbol, enclosingDeclaration, 67216319, false);
-            return access.accessibility === 0;
+            var access = isSymbolAccessible(typeSymbol, enclosingDeclaration, 67216319 /* Value */, /*shouldComputeAliasesToMakeVisible*/ false);
+            return access.accessibility === 0 /* Accessible */;
         }
+        /**
+         * Check if the given symbol in given enclosing declaration is accessible and mark all associated alias to be visible if requested
+         *
+         * @param symbol a Symbol to check if accessible
+         * @param enclosingDeclaration a Node containing reference to the symbol
+         * @param meaning a SymbolFlags to check if such meaning of the symbol is accessible
+         * @param shouldComputeAliasToMakeVisible a boolean value to indicate whether to return aliases to be mark visible in case the symbol is accessible
+         */
         function isSymbolAccessible(symbol, enclosingDeclaration, meaning, shouldComputeAliasesToMakeVisible) {
             if (symbol && enclosingDeclaration) {
                 var initialSymbol = symbol;
                 var meaningToLook = meaning;
                 while (symbol) {
-                    var accessibleSymbolChain = getAccessibleSymbolChain(symbol, enclosingDeclaration, meaningToLook, false);
+                    // Symbol is accessible if it by itself is accessible
+                    var accessibleSymbolChain = getAccessibleSymbolChain(symbol, enclosingDeclaration, meaningToLook, /*useOnlyExternalAliasing*/ false);
                     if (accessibleSymbolChain) {
                         var hasAccessibleDeclarations = hasVisibleDeclarations(accessibleSymbolChain[0], shouldComputeAliasesToMakeVisible);
                         if (!hasAccessibleDeclarations) {
                             return {
-                                accessibility: 1,
+                                accessibility: 1 /* NotAccessible */,
                                 errorSymbolName: symbolToString(initialSymbol, enclosingDeclaration, meaning),
-                                errorModuleName: symbol !== initialSymbol ? symbolToString(symbol, enclosingDeclaration, 1920) : undefined,
+                                errorModuleName: symbol !== initialSymbol ? symbolToString(symbol, enclosingDeclaration, 1920 /* Namespace */) : undefined,
                             };
                         }
                         return hasAccessibleDeclarations;
                     }
                     else {
                         if (ts.some(symbol.declarations, hasNonGlobalAugmentationExternalModuleSymbol)) {
+                            // Any meaning of a module symbol is always accessible via an `import` type
                             return {
-                                accessibility: 0
+                                accessibility: 0 /* Accessible */
                             };
                         }
                     }
+                    // If we haven't got the accessible symbol, it doesn't mean the symbol is actually inaccessible.
+                    // It could be a qualified symbol and hence verify the path
+                    // e.g.:
+                    // module m {
+                    //     export class c {
+                    //     }
+                    // }
+                    // const x: typeof m.c
+                    // In the above example when we start with checking if typeof m.c symbol is accessible,
+                    // we are going to see if c can be accessed in scope directly.
+                    // But it can't, hence the accessible is going to be undefined, but that doesn't mean m.c is inaccessible
+                    // It is accessible if the parent m is accessible because then m.c can be accessed through qualification
                     meaningToLook = getQualifiedLeftMeaning(meaning);
                     symbol = getContainerOfSymbol(symbol);
                 }
+                // This could be a symbol that is not exported in the external module
+                // or it could be a symbol from different external module that is not aliased and hence cannot be named
                 var symbolExternalModule = ts.forEach(initialSymbol.declarations, getExternalModuleContainer);
                 if (symbolExternalModule) {
                     var enclosingExternalModule = getExternalModuleContainer(enclosingDeclaration);
                     if (symbolExternalModule !== enclosingExternalModule) {
+                        // name from different external module that is not visible
                         return {
-                            accessibility: 2,
+                            accessibility: 2 /* CannotBeNamed */,
                             errorSymbolName: symbolToString(initialSymbol, enclosingDeclaration, meaning),
                             errorModuleName: symbolToString(symbolExternalModule)
                         };
                     }
                 }
+                // Just a local name that is not accessible
                 return {
-                    accessibility: 1,
+                    accessibility: 1 /* NotAccessible */,
                     errorSymbolName: symbolToString(initialSymbol, enclosingDeclaration, meaning),
                 };
             }
-            return { accessibility: 0 };
+            return { accessibility: 0 /* Accessible */ };
             function getExternalModuleContainer(declaration) {
                 var node = ts.findAncestor(declaration, hasExternalModuleSymbol);
                 return node && getSymbolOfNode(node);
             }
         }
         function hasExternalModuleSymbol(declaration) {
-            return ts.isAmbientModule(declaration) || (declaration.kind === 274 && ts.isExternalOrCommonJsModule(declaration));
+            return ts.isAmbientModule(declaration) || (declaration.kind === 274 /* SourceFile */ && ts.isExternalOrCommonJsModule(declaration));
         }
         function hasNonGlobalAugmentationExternalModuleSymbol(declaration) {
-            return ts.isModuleWithStringLiteralName(declaration) || (declaration.kind === 274 && ts.isExternalOrCommonJsModule(declaration));
+            return ts.isModuleWithStringLiteralName(declaration) || (declaration.kind === 274 /* SourceFile */ && ts.isExternalOrCommonJsModule(declaration));
         }
         function hasVisibleDeclarations(symbol, shouldComputeAliasToMakeVisible) {
             var aliasesToMakeVisible;
-            if (ts.forEach(symbol.declarations, function (declaration) { return !getIsDeclarationVisible(declaration); })) {
+            if (!ts.every(symbol.declarations, getIsDeclarationVisible)) {
                 return undefined;
             }
-            return { accessibility: 0, aliasesToMakeVisible: aliasesToMakeVisible };
+            return { accessibility: 0 /* Accessible */, aliasesToMakeVisible: aliasesToMakeVisible };
             function getIsDeclarationVisible(declaration) {
                 if (!isDeclarationVisible(declaration)) {
+                    // Mark the unexported alias as visible if its parent is visible
+                    // because these kind of aliases can be used to name types in declaration file
                     var anyImportSyntax = getAnyImportSyntax(declaration);
                     if (anyImportSyntax &&
-                        !ts.hasModifier(anyImportSyntax, 1) &&
+                        !ts.hasModifier(anyImportSyntax, 1 /* Export */) && // import clause without export
                         isDeclarationVisible(anyImportSyntax.parent)) {
                         return addVisibleAlias(declaration, anyImportSyntax);
                     }
                     else if (ts.isVariableDeclaration(declaration) && ts.isVariableStatement(declaration.parent.parent) &&
-                        !ts.hasModifier(declaration.parent.parent, 1) &&
+                        !ts.hasModifier(declaration.parent.parent, 1 /* Export */) && // unexported variable statement
                         isDeclarationVisible(declaration.parent.parent.parent)) {
                         return addVisibleAlias(declaration, declaration.parent.parent);
                     }
-                    else if (ts.isLateVisibilityPaintedStatement(declaration)
-                        && !ts.hasModifier(declaration, 1)
+                    else if (ts.isLateVisibilityPaintedStatement(declaration) // unexported top-level statement
+                        && !ts.hasModifier(declaration, 1 /* Export */)
                         && isDeclarationVisible(declaration.parent)) {
                         return addVisibleAlias(declaration, declaration);
                     }
+                    // Declaration is not visible
                     return false;
                 }
                 return true;
             }
             function addVisibleAlias(declaration, aliasingStatement) {
+                // In function "buildTypeDisplay" where we decide whether to write type-alias or serialize types,
+                // we want to just check if type- alias is accessible or not but we don't care about emitting those alias at that time
+                // since we will do the emitting later in trackSymbol.
                 if (shouldComputeAliasToMakeVisible) {
                     getNodeLinks(declaration).isVisible = true;
                     aliasesToMakeVisible = ts.appendIfUnique(aliasesToMakeVisible, aliasingStatement);
@@ -23706,141 +31642,147 @@ var ts;
             }
         }
         function isEntityNameVisible(entityName, enclosingDeclaration) {
+            // get symbol of the first identifier of the entityName
             var meaning;
-            if (entityName.parent.kind === 165 ||
+            if (entityName.parent.kind === 165 /* TypeQuery */ ||
                 ts.isExpressionWithTypeArgumentsInClassExtendsClause(entityName.parent) ||
-                entityName.parent.kind === 147) {
-                meaning = 67216319 | 1048576;
+                entityName.parent.kind === 147 /* ComputedPropertyName */) {
+                // Typeof value
+                meaning = 67216319 /* Value */ | 1048576 /* ExportValue */;
             }
-            else if (entityName.kind === 146 || entityName.kind === 185 ||
-                entityName.parent.kind === 243) {
-                meaning = 1920;
+            else if (entityName.kind === 146 /* QualifiedName */ || entityName.kind === 185 /* PropertyAccessExpression */ ||
+                entityName.parent.kind === 243 /* ImportEqualsDeclaration */) {
+                // Left identifier from type reference or TypeAlias
+                // Entity name of the import declaration
+                meaning = 1920 /* Namespace */;
             }
             else {
-                meaning = 67901928;
+                // Type Reference or TypeAlias entity = Identifier
+                meaning = 67901928 /* Type */;
             }
             var firstIdentifier = getFirstIdentifier(entityName);
-            var symbol = resolveName(enclosingDeclaration, firstIdentifier.escapedText, meaning, undefined, undefined, false);
-            return (symbol && hasVisibleDeclarations(symbol, true)) || {
-                accessibility: 1,
+            var symbol = resolveName(enclosingDeclaration, firstIdentifier.escapedText, meaning, /*nodeNotFoundErrorMessage*/ undefined, /*nameArg*/ undefined, /*isUse*/ false);
+            // Verify if the symbol is accessible
+            return (symbol && hasVisibleDeclarations(symbol, /*shouldComputeAliasToMakeVisible*/ true)) || {
+                accessibility: 1 /* NotAccessible */,
                 errorSymbolName: ts.getTextOfNode(firstIdentifier),
                 errorNode: firstIdentifier
             };
         }
         function symbolToString(symbol, enclosingDeclaration, meaning, flags, writer) {
-            if (flags === void 0) { flags = 4; }
-            var nodeFlags = 3112960;
-            if (flags & 2) {
-                nodeFlags |= 128;
+            if (flags === void 0) { flags = 4 /* AllowAnyNodeKind */; }
+            var nodeFlags = 3112960 /* IgnoreErrors */;
+            if (flags & 2 /* UseOnlyExternalAliasing */) {
+                nodeFlags |= 128 /* UseOnlyExternalAliasing */;
             }
-            if (flags & 1) {
-                nodeFlags |= 512;
+            if (flags & 1 /* WriteTypeParametersOrArguments */) {
+                nodeFlags |= 512 /* WriteTypeParametersInQualifiedName */;
             }
-            if (flags & 8) {
-                nodeFlags |= 16384;
+            if (flags & 8 /* UseAliasDefinedOutsideCurrentScope */) {
+                nodeFlags |= 16384 /* UseAliasDefinedOutsideCurrentScope */;
             }
-            var builder = flags & 4 ? nodeBuilder.symbolToExpression : nodeBuilder.symbolToEntityName;
+            var builder = flags & 4 /* AllowAnyNodeKind */ ? nodeBuilder.symbolToExpression : nodeBuilder.symbolToEntityName;
             return writer ? symbolToStringWorker(writer).getText() : ts.usingSingleLineStringWriter(symbolToStringWorker);
             function symbolToStringWorker(writer) {
-                var entity = builder(symbol, meaning, enclosingDeclaration, nodeFlags);
+                var entity = builder(symbol, meaning, enclosingDeclaration, nodeFlags); // TODO: GH#18217
                 var printer = ts.createPrinter({ removeComments: true });
                 var sourceFile = enclosingDeclaration && ts.getSourceFileOfNode(enclosingDeclaration);
-                printer.writeNode(4, entity, sourceFile, writer);
+                printer.writeNode(4 /* Unspecified */, entity, /*sourceFile*/ sourceFile, writer);
                 return writer;
             }
         }
         function signatureToString(signature, enclosingDeclaration, flags, kind, writer) {
-            if (flags === void 0) { flags = 0; }
+            if (flags === void 0) { flags = 0 /* None */; }
             return writer ? signatureToStringWorker(writer).getText() : ts.usingSingleLineStringWriter(signatureToStringWorker);
             function signatureToStringWorker(writer) {
                 var sigOutput;
-                if (flags & 262144) {
-                    sigOutput = kind === 1 ? 164 : 163;
+                if (flags & 262144 /* WriteArrowStyleSignature */) {
+                    sigOutput = kind === 1 /* Construct */ ? 164 /* ConstructorType */ : 163 /* FunctionType */;
                 }
                 else {
-                    sigOutput = kind === 1 ? 159 : 158;
+                    sigOutput = kind === 1 /* Construct */ ? 159 /* ConstructSignature */ : 158 /* CallSignature */;
                 }
-                var sig = nodeBuilder.signatureToSignatureDeclaration(signature, sigOutput, enclosingDeclaration, toNodeBuilderFlags(flags) | 3112960 | 512);
+                var sig = nodeBuilder.signatureToSignatureDeclaration(signature, sigOutput, enclosingDeclaration, toNodeBuilderFlags(flags) | 3112960 /* IgnoreErrors */ | 512 /* WriteTypeParametersInQualifiedName */);
                 var printer = ts.createPrinter({ removeComments: true, omitTrailingSemicolon: true });
                 var sourceFile = enclosingDeclaration && ts.getSourceFileOfNode(enclosingDeclaration);
-                printer.writeNode(4, sig, sourceFile, writer);
+                printer.writeNode(4 /* Unspecified */, sig, /*sourceFile*/ sourceFile, writer); // TODO: GH#18217
                 return writer;
             }
         }
         function typeToString(type, enclosingDeclaration, flags, writer) {
-            if (flags === void 0) { flags = 1048576 | 16384; }
+            if (flags === void 0) { flags = 1048576 /* AllowUniqueESSymbolType */ | 16384 /* UseAliasDefinedOutsideCurrentScope */; }
             if (writer === void 0) { writer = ts.createTextWriter(""); }
-            var typeNode = nodeBuilder.typeToTypeNode(type, enclosingDeclaration, toNodeBuilderFlags(flags) | 3112960, writer);
+            var typeNode = nodeBuilder.typeToTypeNode(type, enclosingDeclaration, toNodeBuilderFlags(flags) | 3112960 /* IgnoreErrors */, writer);
             if (typeNode === undefined)
                 return ts.Debug.fail("should always get typenode");
             var options = { removeComments: true };
             var printer = ts.createPrinter(options);
             var sourceFile = enclosingDeclaration && ts.getSourceFileOfNode(enclosingDeclaration);
-            printer.writeNode(4, typeNode, sourceFile, writer);
+            printer.writeNode(4 /* Unspecified */, typeNode, /*sourceFile*/ sourceFile, writer);
             var result = writer.getText();
-            var maxLength = compilerOptions.noErrorTruncation || flags & 1 ? undefined : 100;
+            var maxLength = compilerOptions.noErrorTruncation || flags & 1 /* NoTruncation */ ? undefined : 100;
             if (maxLength && result && result.length >= maxLength) {
                 return result.substr(0, maxLength - "...".length) + "...";
             }
             return result;
         }
         function toNodeBuilderFlags(flags) {
-            if (flags === void 0) { flags = 0; }
-            return flags & 9469291;
+            if (flags === void 0) { flags = 0 /* None */; }
+            return flags & 9469291 /* NodeBuilderFlagsMask */;
         }
         function createNodeBuilder() {
             return {
                 typeToTypeNode: function (type, enclosingDeclaration, flags, tracker) {
-                    ts.Debug.assert(enclosingDeclaration === undefined || (enclosingDeclaration.flags & 8) === 0);
+                    ts.Debug.assert(enclosingDeclaration === undefined || (enclosingDeclaration.flags & 8 /* Synthesized */) === 0);
                     var context = createNodeBuilderContext(enclosingDeclaration, flags, tracker);
                     var resultingNode = typeToTypeNodeHelper(type, context);
                     var result = context.encounteredError ? undefined : resultingNode;
                     return result;
                 },
                 indexInfoToIndexSignatureDeclaration: function (indexInfo, kind, enclosingDeclaration, flags, tracker) {
-                    ts.Debug.assert(enclosingDeclaration === undefined || (enclosingDeclaration.flags & 8) === 0);
+                    ts.Debug.assert(enclosingDeclaration === undefined || (enclosingDeclaration.flags & 8 /* Synthesized */) === 0);
                     var context = createNodeBuilderContext(enclosingDeclaration, flags, tracker);
                     var resultingNode = indexInfoToIndexSignatureDeclarationHelper(indexInfo, kind, context);
                     var result = context.encounteredError ? undefined : resultingNode;
-                    return result;
+                    return result; // TODO: GH#18217
                 },
                 signatureToSignatureDeclaration: function (signature, kind, enclosingDeclaration, flags, tracker) {
-                    ts.Debug.assert(enclosingDeclaration === undefined || (enclosingDeclaration.flags & 8) === 0);
+                    ts.Debug.assert(enclosingDeclaration === undefined || (enclosingDeclaration.flags & 8 /* Synthesized */) === 0);
                     var context = createNodeBuilderContext(enclosingDeclaration, flags, tracker);
                     var resultingNode = signatureToSignatureDeclarationHelper(signature, kind, context);
                     var result = context.encounteredError ? undefined : resultingNode;
                     return result;
                 },
                 symbolToEntityName: function (symbol, meaning, enclosingDeclaration, flags, tracker) {
-                    ts.Debug.assert(enclosingDeclaration === undefined || (enclosingDeclaration.flags & 8) === 0);
+                    ts.Debug.assert(enclosingDeclaration === undefined || (enclosingDeclaration.flags & 8 /* Synthesized */) === 0);
                     var context = createNodeBuilderContext(enclosingDeclaration, flags, tracker);
-                    var resultingNode = symbolToName(symbol, context, meaning, false);
+                    var resultingNode = symbolToName(symbol, context, meaning, /*expectsIdentifier*/ false);
                     var result = context.encounteredError ? undefined : resultingNode;
                     return result;
                 },
                 symbolToExpression: function (symbol, meaning, enclosingDeclaration, flags, tracker) {
-                    ts.Debug.assert(enclosingDeclaration === undefined || (enclosingDeclaration.flags & 8) === 0);
+                    ts.Debug.assert(enclosingDeclaration === undefined || (enclosingDeclaration.flags & 8 /* Synthesized */) === 0);
                     var context = createNodeBuilderContext(enclosingDeclaration, flags, tracker);
                     var resultingNode = symbolToExpression(symbol, context, meaning);
                     var result = context.encounteredError ? undefined : resultingNode;
                     return result;
                 },
                 symbolToTypeParameterDeclarations: function (symbol, enclosingDeclaration, flags, tracker) {
-                    ts.Debug.assert(enclosingDeclaration === undefined || (enclosingDeclaration.flags & 8) === 0);
+                    ts.Debug.assert(enclosingDeclaration === undefined || (enclosingDeclaration.flags & 8 /* Synthesized */) === 0);
                     var context = createNodeBuilderContext(enclosingDeclaration, flags, tracker);
                     var resultingNode = typeParametersToTypeParameterDeclarations(symbol, context);
                     var result = context.encounteredError ? undefined : resultingNode;
                     return result;
                 },
                 symbolToParameterDeclaration: function (symbol, enclosingDeclaration, flags, tracker) {
-                    ts.Debug.assert(enclosingDeclaration === undefined || (enclosingDeclaration.flags & 8) === 0);
+                    ts.Debug.assert(enclosingDeclaration === undefined || (enclosingDeclaration.flags & 8 /* Synthesized */) === 0);
                     var context = createNodeBuilderContext(enclosingDeclaration, flags, tracker);
                     var resultingNode = symbolToParameterDeclaration(symbol, context);
                     var result = context.encounteredError ? undefined : resultingNode;
                     return result;
                 },
                 typeParameterToDeclaration: function (parameter, enclosingDeclaration, flags, tracker) {
-                    ts.Debug.assert(enclosingDeclaration === undefined || (enclosingDeclaration.flags & 8) === 0);
+                    ts.Debug.assert(enclosingDeclaration === undefined || (enclosingDeclaration.flags & 8 /* Synthesized */) === 0);
                     var context = createNodeBuilderContext(enclosingDeclaration, flags, tracker);
                     var resultingNode = typeParameterToDeclaration(parameter, context);
                     var result = context.encounteredError ? undefined : resultingNode;
@@ -23850,7 +31792,7 @@ var ts;
             function createNodeBuilderContext(enclosingDeclaration, flags, tracker) {
                 return {
                     enclosingDeclaration: enclosingDeclaration,
-                    flags: flags || 0,
+                    flags: flags || 0 /* None */,
                     tracker: tracker && tracker.trackSymbol ? tracker : { trackSymbol: ts.noop },
                     encounteredError: false,
                     visitedSymbols: undefined,
@@ -23861,78 +31803,78 @@ var ts;
                 if (cancellationToken && cancellationToken.throwIfCancellationRequested) {
                     cancellationToken.throwIfCancellationRequested();
                 }
-                var inTypeAlias = context.flags & 8388608;
-                context.flags &= ~8388608;
+                var inTypeAlias = context.flags & 8388608 /* InTypeAlias */;
+                context.flags &= ~8388608 /* InTypeAlias */;
                 if (!type) {
                     context.encounteredError = true;
-                    return undefined;
+                    return undefined; // TODO: GH#18217
                 }
-                if (type.flags & 1) {
-                    return ts.createKeywordTypeNode(119);
+                if (type.flags & 1 /* Any */) {
+                    return ts.createKeywordTypeNode(119 /* AnyKeyword */);
                 }
-                if (type.flags & 2) {
-                    return ts.createKeywordTypeNode(142);
+                if (type.flags & 2 /* Unknown */) {
+                    return ts.createKeywordTypeNode(142 /* UnknownKeyword */);
                 }
-                if (type.flags & 4) {
-                    return ts.createKeywordTypeNode(137);
+                if (type.flags & 4 /* String */) {
+                    return ts.createKeywordTypeNode(137 /* StringKeyword */);
                 }
-                if (type.flags & 8) {
-                    return ts.createKeywordTypeNode(134);
+                if (type.flags & 8 /* Number */) {
+                    return ts.createKeywordTypeNode(134 /* NumberKeyword */);
                 }
-                if (type.flags & 16) {
-                    return ts.createKeywordTypeNode(122);
+                if (type.flags & 16 /* Boolean */) {
+                    return ts.createKeywordTypeNode(122 /* BooleanKeyword */);
                 }
-                if (type.flags & 512 && !(type.flags & 262144)) {
+                if (type.flags & 512 /* EnumLiteral */ && !(type.flags & 262144 /* Union */)) {
                     var parentSymbol = getParentOfSymbol(type.symbol);
-                    var parentName = symbolToName(parentSymbol, context, 67901928, false);
+                    var parentName = symbolToName(parentSymbol, context, 67901928 /* Type */, /*expectsIdentifier*/ false);
                     var enumLiteralName = getDeclaredTypeOfSymbol(parentSymbol) === type ? parentName : ts.createQualifiedName(parentName, ts.symbolName(type.symbol));
-                    return ts.createTypeReferenceNode(enumLiteralName, undefined);
+                    return ts.createTypeReferenceNode(enumLiteralName, /*typeArguments*/ undefined);
                 }
-                if (type.flags & 544) {
-                    var name = symbolToName(type.symbol, context, 67901928, false);
-                    return ts.createTypeReferenceNode(name, undefined);
+                if (type.flags & 544 /* EnumLike */) {
+                    var name = symbolToName(type.symbol, context, 67901928 /* Type */, /*expectsIdentifier*/ false);
+                    return ts.createTypeReferenceNode(name, /*typeArguments*/ undefined);
                 }
-                if (type.flags & (64)) {
-                    return ts.createLiteralTypeNode(ts.setEmitFlags(ts.createLiteral(type.value), 16777216));
+                if (type.flags & (64 /* StringLiteral */)) {
+                    return ts.createLiteralTypeNode(ts.setEmitFlags(ts.createLiteral(type.value), 16777216 /* NoAsciiEscaping */));
                 }
-                if (type.flags & (128)) {
+                if (type.flags & (128 /* NumberLiteral */)) {
                     return ts.createLiteralTypeNode((ts.createLiteral(type.value)));
                 }
-                if (type.flags & 256) {
+                if (type.flags & 256 /* BooleanLiteral */) {
                     return type.intrinsicName === "true" ? ts.createTrue() : ts.createFalse();
                 }
-                if (type.flags & 2048) {
-                    if (!(context.flags & 1048576)) {
+                if (type.flags & 2048 /* UniqueESSymbol */) {
+                    if (!(context.flags & 1048576 /* AllowUniqueESSymbolType */)) {
                         if (isValueSymbolAccessible(type.symbol, context.enclosingDeclaration)) {
-                            return symbolToTypeNode(type.symbol, context, 67216319);
+                            return symbolToTypeNode(type.symbol, context, 67216319 /* Value */);
                         }
                         if (context.tracker.reportInaccessibleUniqueSymbolError) {
                             context.tracker.reportInaccessibleUniqueSymbolError();
                         }
                     }
-                    return ts.createTypeOperatorNode(141, ts.createKeywordTypeNode(138));
+                    return ts.createTypeOperatorNode(141 /* UniqueKeyword */, ts.createKeywordTypeNode(138 /* SymbolKeyword */));
                 }
-                if (type.flags & 4096) {
-                    return ts.createKeywordTypeNode(105);
+                if (type.flags & 4096 /* Void */) {
+                    return ts.createKeywordTypeNode(105 /* VoidKeyword */);
                 }
-                if (type.flags & 8192) {
-                    return ts.createKeywordTypeNode(140);
+                if (type.flags & 8192 /* Undefined */) {
+                    return ts.createKeywordTypeNode(140 /* UndefinedKeyword */);
                 }
-                if (type.flags & 16384) {
-                    return ts.createKeywordTypeNode(95);
+                if (type.flags & 16384 /* Null */) {
+                    return ts.createKeywordTypeNode(95 /* NullKeyword */);
                 }
-                if (type.flags & 32768) {
-                    return ts.createKeywordTypeNode(131);
+                if (type.flags & 32768 /* Never */) {
+                    return ts.createKeywordTypeNode(131 /* NeverKeyword */);
                 }
-                if (type.flags & 1024) {
-                    return ts.createKeywordTypeNode(138);
+                if (type.flags & 1024 /* ESSymbol */) {
+                    return ts.createKeywordTypeNode(138 /* SymbolKeyword */);
                 }
-                if (type.flags & 16777216) {
-                    return ts.createKeywordTypeNode(135);
+                if (type.flags & 16777216 /* NonPrimitive */) {
+                    return ts.createKeywordTypeNode(135 /* ObjectKeyword */);
                 }
-                if (type.flags & 65536 && type.isThisType) {
-                    if (context.flags & 4194304) {
-                        if (!context.encounteredError && !(context.flags & 32768)) {
+                if (type.flags & 65536 /* TypeParameter */ && type.isThisType) {
+                    if (context.flags & 4194304 /* InObjectTypeLiteral */) {
+                        if (!context.encounteredError && !(context.flags & 32768 /* AllowThisInObjectLiteral */)) {
                             context.encounteredError = true;
                         }
                         if (context.tracker.reportInaccessibleThisError) {
@@ -23942,61 +31884,63 @@ var ts;
                     return ts.createThis();
                 }
                 var objectFlags = ts.getObjectFlags(type);
-                if (objectFlags & 4) {
-                    ts.Debug.assert(!!(type.flags & 131072));
+                if (objectFlags & 4 /* Reference */) {
+                    ts.Debug.assert(!!(type.flags & 131072 /* Object */));
                     return typeReferenceToTypeNode(type);
                 }
-                if (type.flags & 65536 || objectFlags & 3) {
-                    if (type.flags & 65536 && ts.contains(context.inferTypeParameters, type)) {
-                        return ts.createInferTypeNode(typeParameterToDeclarationWithConstraint(type, context, undefined));
+                if (type.flags & 65536 /* TypeParameter */ || objectFlags & 3 /* ClassOrInterface */) {
+                    if (type.flags & 65536 /* TypeParameter */ && ts.contains(context.inferTypeParameters, type)) {
+                        return ts.createInferTypeNode(typeParameterToDeclarationWithConstraint(type, context, /*constraintNode*/ undefined));
                     }
-                    if (context.flags & 4 &&
-                        type.flags & 65536 &&
+                    if (context.flags & 4 /* GenerateNamesForShadowedTypeParams */ &&
+                        type.flags & 65536 /* TypeParameter */ &&
                         ts.length(type.symbol.declarations) &&
                         ts.isTypeParameterDeclaration(type.symbol.declarations[0]) &&
                         typeParameterShadowsNameInScope(type, context) &&
                         !isTypeSymbolAccessible(type.symbol, context.enclosingDeclaration)) {
-                        return ts.createTypeReferenceNode(ts.getGeneratedNameForNode(type.symbol.declarations[0].name, 16 | 8), undefined);
+                        return ts.createTypeReferenceNode(ts.getGeneratedNameForNode(type.symbol.declarations[0].name, 16 /* Optimistic */ | 8 /* ReservedInNestedScopes */), /*typeArguments*/ undefined);
                     }
+                    // Ignore constraint/default when creating a usage (as opposed to declaration) of a type parameter.
                     return type.symbol
-                        ? symbolToTypeNode(type.symbol, context, 67901928)
-                        : ts.createTypeReferenceNode(ts.createIdentifier("?"), undefined);
+                        ? symbolToTypeNode(type.symbol, context, 67901928 /* Type */)
+                        : ts.createTypeReferenceNode(ts.createIdentifier("?"), /*typeArguments*/ undefined);
                 }
-                if (!inTypeAlias && type.aliasSymbol && (context.flags & 16384 || isTypeSymbolAccessible(type.aliasSymbol, context.enclosingDeclaration))) {
+                if (!inTypeAlias && type.aliasSymbol && (context.flags & 16384 /* UseAliasDefinedOutsideCurrentScope */ || isTypeSymbolAccessible(type.aliasSymbol, context.enclosingDeclaration))) {
                     var typeArgumentNodes = mapToTypeNodes(type.aliasTypeArguments, context);
-                    if (isReservedMemberName(type.aliasSymbol.escapedName) && !(type.aliasSymbol.flags & 32))
+                    if (isReservedMemberName(type.aliasSymbol.escapedName) && !(type.aliasSymbol.flags & 32 /* Class */))
                         return ts.createTypeReferenceNode(ts.createIdentifier(""), typeArgumentNodes);
-                    return symbolToTypeNode(type.aliasSymbol, context, 67901928, typeArgumentNodes);
+                    return symbolToTypeNode(type.aliasSymbol, context, 67901928 /* Type */, typeArgumentNodes);
                 }
-                if (type.flags & (262144 | 524288)) {
-                    var types = type.flags & 262144 ? formatUnionTypes(type.types) : type.types;
+                if (type.flags & (262144 /* Union */ | 524288 /* Intersection */)) {
+                    var types = type.flags & 262144 /* Union */ ? formatUnionTypes(type.types) : type.types;
                     var typeNodes = mapToTypeNodes(types, context);
                     if (typeNodes && typeNodes.length > 0) {
-                        var unionOrIntersectionTypeNode = ts.createUnionOrIntersectionTypeNode(type.flags & 262144 ? 169 : 170, typeNodes);
+                        var unionOrIntersectionTypeNode = ts.createUnionOrIntersectionTypeNode(type.flags & 262144 /* Union */ ? 169 /* UnionType */ : 170 /* IntersectionType */, typeNodes);
                         return unionOrIntersectionTypeNode;
                     }
                     else {
-                        if (!context.encounteredError && !(context.flags & 262144)) {
+                        if (!context.encounteredError && !(context.flags & 262144 /* AllowEmptyUnionOrIntersection */)) {
                             context.encounteredError = true;
                         }
-                        return undefined;
+                        return undefined; // TODO: GH#18217
                     }
                 }
-                if (objectFlags & (16 | 32)) {
-                    ts.Debug.assert(!!(type.flags & 131072));
+                if (objectFlags & (16 /* Anonymous */ | 32 /* Mapped */)) {
+                    ts.Debug.assert(!!(type.flags & 131072 /* Object */));
+                    // The type is an object literal type.
                     return createAnonymousTypeNode(type);
                 }
-                if (type.flags & 1048576) {
+                if (type.flags & 1048576 /* Index */) {
                     var indexedType = type.type;
                     var indexTypeNode = typeToTypeNodeHelper(indexedType, context);
                     return ts.createTypeOperatorNode(indexTypeNode);
                 }
-                if (type.flags & 2097152) {
+                if (type.flags & 2097152 /* IndexedAccess */) {
                     var objectTypeNode = typeToTypeNodeHelper(type.objectType, context);
                     var indexTypeNode = typeToTypeNodeHelper(type.indexType, context);
                     return ts.createIndexedAccessTypeNode(objectTypeNode, indexTypeNode);
                 }
-                if (type.flags & 4194304) {
+                if (type.flags & 4194304 /* Conditional */) {
                     var checkTypeNode = typeToTypeNodeHelper(type.checkType, context);
                     var saveInferTypeParameters = context.inferTypeParameters;
                     context.inferTypeParameters = type.root.inferTypeParameters;
@@ -24006,16 +31950,18 @@ var ts;
                     var falseTypeNode = typeToTypeNodeHelper(getFalseTypeFromConditionalType(type), context);
                     return ts.createConditionalTypeNode(checkTypeNode, extendsTypeNode, trueTypeNode, falseTypeNode);
                 }
-                if (type.flags & 8388608) {
+                if (type.flags & 8388608 /* Substitution */) {
                     return typeToTypeNodeHelper(type.typeVariable, context);
                 }
                 return ts.Debug.fail("Should be unreachable.");
                 function createMappedTypeNodeFromType(type) {
-                    ts.Debug.assert(!!(type.flags & 131072));
+                    ts.Debug.assert(!!(type.flags & 131072 /* Object */));
                     var readonlyToken = type.declaration.readonlyToken ? ts.createToken(type.declaration.readonlyToken.kind) : undefined;
                     var questionToken = type.declaration.questionToken ? ts.createToken(type.declaration.questionToken.kind) : undefined;
                     var appropriateConstraintTypeNode;
                     if (isMappedTypeWithKeyofConstraintDeclaration(type)) {
+                        // We have a { [P in keyof T]: X }
+                        // We do this to ensure we retain the toplevel keyof-ness of the type which may be lost due to keyof distribution during `getConstraintTypeFromMappedType`
                         appropriateConstraintTypeNode = ts.createTypeOperatorNode(typeToTypeNodeHelper(getModifiersTypeFromMappedType(type), context));
                     }
                     else {
@@ -24024,33 +31970,39 @@ var ts;
                     var typeParameterNode = typeParameterToDeclarationWithConstraint(getTypeParameterFromMappedType(type), context, appropriateConstraintTypeNode);
                     var templateTypeNode = typeToTypeNodeHelper(getTemplateTypeFromMappedType(type), context);
                     var mappedTypeNode = ts.createMappedTypeNode(readonlyToken, typeParameterNode, questionToken, templateTypeNode);
-                    return ts.setEmitFlags(mappedTypeNode, 1);
+                    return ts.setEmitFlags(mappedTypeNode, 1 /* SingleLine */);
                 }
                 function createAnonymousTypeNode(type) {
                     var symbol = type.symbol;
                     var id;
                     if (symbol) {
-                        var isConstructorObject = ts.getObjectFlags(type) & 16 && type.symbol && type.symbol.flags & 32;
+                        var isConstructorObject = ts.getObjectFlags(type) & 16 /* Anonymous */ && type.symbol && type.symbol.flags & 32 /* Class */;
                         id = (isConstructorObject ? "+" : "") + getSymbolId(symbol);
                         if (isJavaScriptConstructor(symbol.valueDeclaration)) {
-                            var isInstanceType = type === getInferredClassType(symbol) ? 67901928 : 67216319;
+                            // Instance and static types share the same symbol; only add 'typeof' for the static side.
+                            var isInstanceType = type === getInferredClassType(symbol) ? 67901928 /* Type */ : 67216319 /* Value */;
                             return symbolToTypeNode(symbol, context, isInstanceType);
                         }
-                        else if (symbol.flags & 32 && !getBaseTypeVariableOfClass(symbol) && !(symbol.valueDeclaration.kind === 205 && context.flags & 2048) ||
-                            symbol.flags & (384 | 512) ||
+                        // Always use 'typeof T' for type of class, enum, and module objects
+                        else if (symbol.flags & 32 /* Class */ && !getBaseTypeVariableOfClass(symbol) && !(symbol.valueDeclaration.kind === 205 /* ClassExpression */ && context.flags & 2048 /* WriteClassExpressionAsTypeLiteral */) ||
+                            symbol.flags & (384 /* Enum */ | 512 /* ValueModule */) ||
                             shouldWriteTypeOfFunctionSymbol()) {
-                            return symbolToTypeNode(symbol, context, 67216319);
+                            return symbolToTypeNode(symbol, context, 67216319 /* Value */);
                         }
                         else if (context.visitedSymbols && context.visitedSymbols.has(id)) {
+                            // If type is an anonymous type literal in a type alias declaration, use type alias name
                             var typeAlias = getTypeAliasForTypeLiteral(type);
                             if (typeAlias) {
-                                return symbolToTypeNode(typeAlias, context, 67901928);
+                                // The specified symbol flags need to be reinterpreted as type flags
+                                return symbolToTypeNode(typeAlias, context, 67901928 /* Type */);
                             }
                             else {
-                                return ts.createKeywordTypeNode(119);
+                                return ts.createKeywordTypeNode(119 /* AnyKeyword */);
                             }
                         }
                         else {
+                            // Since instantiations of the same anonymous type have the same symbol, tracking symbols instead
+                            // of types allows us to catch circular references to instantiations of the same anonymous type
                             if (!context.visitedSymbols) {
                                 context.visitedSymbols = ts.createMap();
                             }
@@ -24061,19 +32013,21 @@ var ts;
                         }
                     }
                     else {
+                        // Anonymous types without a symbol are never circular.
                         return createTypeNodeFromObjectType(type);
                     }
                     function shouldWriteTypeOfFunctionSymbol() {
-                        var isStaticMethodSymbol = !!(symbol.flags & 8192) &&
-                            ts.some(symbol.declarations, function (declaration) { return ts.hasModifier(declaration, 32); });
-                        var isNonLocalFunctionSymbol = !!(symbol.flags & 16) &&
-                            (symbol.parent ||
+                        var isStaticMethodSymbol = !!(symbol.flags & 8192 /* Method */) && // typeof static method
+                            ts.some(symbol.declarations, function (declaration) { return ts.hasModifier(declaration, 32 /* Static */); });
+                        var isNonLocalFunctionSymbol = !!(symbol.flags & 16 /* Function */) &&
+                            (symbol.parent || // is exported function symbol
                                 ts.forEach(symbol.declarations, function (declaration) {
-                                    return declaration.parent.kind === 274 || declaration.parent.kind === 240;
+                                    return declaration.parent.kind === 274 /* SourceFile */ || declaration.parent.kind === 240 /* ModuleBlock */;
                                 }));
                         if (isStaticMethodSymbol || isNonLocalFunctionSymbol) {
-                            return (!!(context.flags & 4096) || (context.visitedSymbols && context.visitedSymbols.has(id))) &&
-                                (!(context.flags & 8) || isValueSymbolAccessible(symbol, context.enclosingDeclaration));
+                            // typeof is allowed only for static/non local functions
+                            return (!!(context.flags & 4096 /* UseTypeOfFunction */) || (context.visitedSymbols && context.visitedSymbols.has(id))) && // it is type of the symbol uses itself recursively
+                                (!(context.flags & 8 /* UseStructuralFallback */) || isValueSymbolAccessible(symbol, context.enclosingDeclaration)); // TODO: GH#18217 // And the build is going to succeed without visibility error or there is no structural fallback allowed
                         }
                     }
                 }
@@ -24084,50 +32038,50 @@ var ts;
                     var resolved = resolveStructuredTypeMembers(type);
                     if (!resolved.properties.length && !resolved.stringIndexInfo && !resolved.numberIndexInfo) {
                         if (!resolved.callSignatures.length && !resolved.constructSignatures.length) {
-                            return ts.setEmitFlags(ts.createTypeLiteralNode(undefined), 1);
+                            return ts.setEmitFlags(ts.createTypeLiteralNode(/*members*/ undefined), 1 /* SingleLine */);
                         }
                         if (resolved.callSignatures.length === 1 && !resolved.constructSignatures.length) {
                             var signature = resolved.callSignatures[0];
-                            var signatureNode = signatureToSignatureDeclarationHelper(signature, 163, context);
+                            var signatureNode = signatureToSignatureDeclarationHelper(signature, 163 /* FunctionType */, context);
                             return signatureNode;
                         }
                         if (resolved.constructSignatures.length === 1 && !resolved.callSignatures.length) {
                             var signature = resolved.constructSignatures[0];
-                            var signatureNode = signatureToSignatureDeclarationHelper(signature, 164, context);
+                            var signatureNode = signatureToSignatureDeclarationHelper(signature, 164 /* ConstructorType */, context);
                             return signatureNode;
                         }
                     }
                     var savedFlags = context.flags;
-                    context.flags |= 4194304;
+                    context.flags |= 4194304 /* InObjectTypeLiteral */;
                     var members = createTypeNodesFromResolvedType(resolved);
                     context.flags = savedFlags;
                     var typeLiteralNode = ts.createTypeLiteralNode(members);
-                    return ts.setEmitFlags(typeLiteralNode, (context.flags & 1024) ? 0 : 1);
+                    return ts.setEmitFlags(typeLiteralNode, (context.flags & 1024 /* MultilineObjectLiterals */) ? 0 : 1 /* SingleLine */);
                 }
                 function typeReferenceToTypeNode(type) {
                     var typeArguments = type.typeArguments || ts.emptyArray;
                     if (type.target === globalArrayType) {
-                        if (context.flags & 2) {
+                        if (context.flags & 2 /* WriteArrayAsGenericType */) {
                             var typeArgumentNode = typeToTypeNodeHelper(typeArguments[0], context);
                             return ts.createTypeReferenceNode("Array", [typeArgumentNode]);
                         }
                         var elementType = typeToTypeNodeHelper(typeArguments[0], context);
                         return ts.createArrayTypeNode(elementType);
                     }
-                    else if (type.target.objectFlags & 8) {
+                    else if (type.target.objectFlags & 8 /* Tuple */) {
                         if (typeArguments.length > 0) {
                             var tupleConstituentNodes = mapToTypeNodes(typeArguments.slice(0, getTypeReferenceArity(type)), context);
                             if (tupleConstituentNodes && tupleConstituentNodes.length > 0) {
                                 return ts.createTupleTypeNode(tupleConstituentNodes);
                             }
                         }
-                        if (context.encounteredError || (context.flags & 524288)) {
+                        if (context.encounteredError || (context.flags & 524288 /* AllowEmptyTuple */)) {
                             return ts.createTupleTypeNode([]);
                         }
                         context.encounteredError = true;
-                        return undefined;
+                        return undefined; // TODO: GH#18217
                     }
-                    else if (context.flags & 2048 &&
+                    else if (context.flags & 2048 /* WriteClassExpressionAsTypeLiteral */ &&
                         type.symbol.valueDeclaration &&
                         ts.isClassLike(type.symbol.valueDeclaration) &&
                         !isValueSymbolAccessible(type.symbol, context.enclosingDeclaration)) {
@@ -24140,16 +32094,19 @@ var ts;
                         if (outerTypeParameters) {
                             var length_1 = outerTypeParameters.length;
                             while (i < length_1) {
+                                // Find group of type arguments for type parameters with the same declaring container.
                                 var start = i;
                                 var parent = getParentSymbolOfTypeParameter(outerTypeParameters[i]);
                                 do {
                                     i++;
                                 } while (i < length_1 && getParentSymbolOfTypeParameter(outerTypeParameters[i]) === parent);
+                                // When type parameters are their own type arguments for the whole group (i.e. we have
+                                // the default outer type arguments), we don't show the group.
                                 if (!ts.rangeEquals(outerTypeParameters, typeArguments, start, i)) {
                                     var typeArgumentSlice = mapToTypeNodes(typeArguments.slice(start, i), context);
                                     var flags_2 = context.flags;
-                                    context.flags |= 16;
-                                    var ref = symbolToTypeNode(parent, context, 67901928, typeArgumentSlice);
+                                    context.flags |= 16 /* ForbidIndexedAccessSymbolReferences */;
+                                    var ref = symbolToTypeNode(parent, context, 67901928 /* Type */, typeArgumentSlice);
                                     context.flags = flags_2;
                                     resultType = !resultType ? ref : appendReferenceToType(resultType, ref);
                                 }
@@ -24161,19 +32118,21 @@ var ts;
                             typeArgumentNodes = mapToTypeNodes(typeArguments.slice(i, typeParameterCount), context);
                         }
                         var flags = context.flags;
-                        context.flags |= 16;
-                        var finalRef = symbolToTypeNode(type.symbol, context, 67901928, typeArgumentNodes);
+                        context.flags |= 16 /* ForbidIndexedAccessSymbolReferences */;
+                        var finalRef = symbolToTypeNode(type.symbol, context, 67901928 /* Type */, typeArgumentNodes);
                         context.flags = flags;
                         return !resultType ? finalRef : appendReferenceToType(resultType, finalRef);
                     }
                 }
                 function appendReferenceToType(root, ref) {
                     if (ts.isImportTypeNode(root)) {
+                        // first shift type arguments
                         var innerParams = root.typeArguments;
                         if (root.qualifier) {
                             (ts.isIdentifier(root.qualifier) ? root.qualifier : root.qualifier.right).typeArguments = innerParams;
                         }
                         root.typeArguments = ref.typeArguments;
+                        // then move qualifiers
                         var ids = getAccessStack(ref);
                         for (var _i = 0, ids_1 = ids; _i < ids_1.length; _i++) {
                             var id = ids_1[_i];
@@ -24182,9 +32141,11 @@ var ts;
                         return root;
                     }
                     else {
+                        // first shift type arguments
                         var innerParams = root.typeArguments;
                         (ts.isIdentifier(root.typeName) ? root.typeName : root.typeName.right).typeArguments = innerParams;
                         root.typeArguments = ref.typeArguments;
+                        // then move qualifiers
                         var ids = getAccessStack(ref);
                         for (var _a = 0, ids_2 = ids; _a < ids_2.length; _a++) {
                             var id = ids_2[_a];
@@ -24207,20 +32168,20 @@ var ts;
                     var typeElements = [];
                     for (var _i = 0, _a = resolvedType.callSignatures; _i < _a.length; _i++) {
                         var signature = _a[_i];
-                        typeElements.push(signatureToSignatureDeclarationHelper(signature, 158, context));
+                        typeElements.push(signatureToSignatureDeclarationHelper(signature, 158 /* CallSignature */, context));
                     }
                     for (var _b = 0, _c = resolvedType.constructSignatures; _b < _c.length; _b++) {
                         var signature = _c[_b];
-                        typeElements.push(signatureToSignatureDeclarationHelper(signature, 159, context));
+                        typeElements.push(signatureToSignatureDeclarationHelper(signature, 159 /* ConstructSignature */, context));
                     }
                     if (resolvedType.stringIndexInfo) {
-                        var indexInfo = resolvedType.objectFlags & 2048 ?
+                        var indexInfo = resolvedType.objectFlags & 2048 /* ReverseMapped */ ?
                             createIndexInfo(anyType, resolvedType.stringIndexInfo.isReadonly, resolvedType.stringIndexInfo.declaration) :
                             resolvedType.stringIndexInfo;
-                        typeElements.push(indexInfoToIndexSignatureDeclarationHelper(indexInfo, 0, context));
+                        typeElements.push(indexInfoToIndexSignatureDeclarationHelper(indexInfo, 0 /* String */, context));
                     }
                     if (resolvedType.numberIndexInfo) {
-                        typeElements.push(indexInfoToIndexSignatureDeclarationHelper(resolvedType.numberIndexInfo, 1, context));
+                        typeElements.push(indexInfoToIndexSignatureDeclarationHelper(resolvedType.numberIndexInfo, 1 /* Number */, context));
                     }
                     var properties = resolvedType.properties;
                     if (!properties) {
@@ -24228,36 +32189,41 @@ var ts;
                     }
                     for (var _d = 0, properties_1 = properties; _d < properties_1.length; _d++) {
                         var propertySymbol = properties_1[_d];
-                        if (context.flags & 2048) {
-                            if (propertySymbol.flags & 4194304) {
+                        if (context.flags & 2048 /* WriteClassExpressionAsTypeLiteral */) {
+                            if (propertySymbol.flags & 4194304 /* Prototype */) {
                                 continue;
                             }
-                            if (ts.getDeclarationModifierFlagsFromSymbol(propertySymbol) & (8 | 16) && context.tracker.reportPrivateInBaseOfClassExpression) {
+                            if (ts.getDeclarationModifierFlagsFromSymbol(propertySymbol) & (8 /* Private */ | 16 /* Protected */) && context.tracker.reportPrivateInBaseOfClassExpression) {
                                 context.tracker.reportPrivateInBaseOfClassExpression(ts.unescapeLeadingUnderscores(propertySymbol.escapedName));
                             }
                         }
-                        var propertyType = ts.getCheckFlags(propertySymbol) & 2048 && context.flags & 33554432 ?
+                        var propertyType = ts.getCheckFlags(propertySymbol) & 2048 /* ReverseMapped */ && context.flags & 33554432 /* InReverseMappedType */ ?
                             anyType : getTypeOfSymbol(propertySymbol);
                         var saveEnclosingDeclaration = context.enclosingDeclaration;
                         context.enclosingDeclaration = undefined;
-                        if (ts.getCheckFlags(propertySymbol) & 1024) {
+                        if (ts.getCheckFlags(propertySymbol) & 1024 /* Late */) {
                             var decl = ts.first(propertySymbol.declarations);
-                            var name = hasLateBindableName(decl) && resolveEntityName(decl.name.expression, 67216319);
-                            if (name && context.tracker.trackSymbol) {
-                                context.tracker.trackSymbol(name, saveEnclosingDeclaration, 67216319);
+                            if (context.tracker.trackSymbol && hasLateBindableName(decl)) {
+                                // get symbol of the first identifier of the entityName
+                                var firstIdentifier = getFirstIdentifier(decl.name.expression);
+                                var name = resolveName(firstIdentifier, firstIdentifier.escapedText, 67216319 /* Value */ | 1048576 /* ExportValue */, /*nodeNotFoundErrorMessage*/ undefined, /*nameArg*/ undefined, /*isUse*/ true);
+                                if (name) {
+                                    context.tracker.trackSymbol(name, saveEnclosingDeclaration, 67216319 /* Value */);
+                                }
                             }
                         }
-                        var propertyName = symbolToName(propertySymbol, context, 67216319, true);
+                        var propertyName = symbolToName(propertySymbol, context, 67216319 /* Value */, /*expectsIdentifier*/ true);
                         context.enclosingDeclaration = saveEnclosingDeclaration;
-                        var optionalToken = propertySymbol.flags & 16777216 ? ts.createToken(55) : undefined;
-                        if (propertySymbol.flags & (16 | 8192) && !getPropertiesOfObjectType(propertyType).length) {
-                            var signatures = getSignaturesOfType(propertyType, 0);
+                        var optionalToken = propertySymbol.flags & 16777216 /* Optional */ ? ts.createToken(55 /* QuestionToken */) : undefined;
+                        if (propertySymbol.flags & (16 /* Function */ | 8192 /* Method */) && !getPropertiesOfObjectType(propertyType).length) {
+                            var signatures = getSignaturesOfType(propertyType, 0 /* Call */);
                             for (var _e = 0, signatures_1 = signatures; _e < signatures_1.length; _e++) {
                                 var signature = signatures_1[_e];
-                                var methodDeclaration = signatureToSignatureDeclarationHelper(signature, 153, context);
+                                var methodDeclaration = signatureToSignatureDeclarationHelper(signature, 153 /* MethodSignature */, context);
                                 methodDeclaration.name = propertyName;
                                 methodDeclaration.questionToken = optionalToken;
                                 if (propertySymbol.valueDeclaration) {
+                                    // Copy comments to node for declaration emit
                                     ts.setCommentRange(methodDeclaration, propertySymbol.valueDeclaration);
                                 }
                                 typeElements.push(methodDeclaration);
@@ -24265,12 +32231,14 @@ var ts;
                         }
                         else {
                             var savedFlags = context.flags;
-                            context.flags |= !!(ts.getCheckFlags(propertySymbol) & 2048) ? 33554432 : 0;
-                            var propertyTypeNode = propertyType ? typeToTypeNodeHelper(propertyType, context) : ts.createKeywordTypeNode(119);
+                            context.flags |= !!(ts.getCheckFlags(propertySymbol) & 2048 /* ReverseMapped */) ? 33554432 /* InReverseMappedType */ : 0;
+                            var propertyTypeNode = propertyType ? typeToTypeNodeHelper(propertyType, context) : ts.createKeywordTypeNode(119 /* AnyKeyword */);
                             context.flags = savedFlags;
-                            var modifiers = isReadonlySymbol(propertySymbol) ? [ts.createToken(132)] : undefined;
-                            var propertySignature = ts.createPropertySignature(modifiers, propertyName, optionalToken, propertyTypeNode, undefined);
+                            var modifiers = isReadonlySymbol(propertySymbol) ? [ts.createToken(132 /* ReadonlyKeyword */)] : undefined;
+                            var propertySignature = ts.createPropertySignature(modifiers, propertyName, optionalToken, propertyTypeNode, 
+                            /*initializer*/ undefined);
                             if (propertySymbol.valueDeclaration) {
+                                // Copy comments to node for declaration emit
                                 ts.setCommentRange(propertySignature, propertySymbol.valueDeclaration);
                             }
                             typeElements.push(propertySignature);
@@ -24294,24 +32262,30 @@ var ts;
             }
             function indexInfoToIndexSignatureDeclarationHelper(indexInfo, kind, context) {
                 var name = ts.getNameFromIndexInfo(indexInfo) || "x";
-                var indexerTypeNode = ts.createKeywordTypeNode(kind === 0 ? 137 : 134);
-                var indexingParameter = ts.createParameter(undefined, undefined, undefined, name, undefined, indexerTypeNode, undefined);
+                var indexerTypeNode = ts.createKeywordTypeNode(kind === 0 /* String */ ? 137 /* StringKeyword */ : 134 /* NumberKeyword */);
+                var indexingParameter = ts.createParameter(
+                /*decorators*/ undefined, 
+                /*modifiers*/ undefined, 
+                /*dotDotDotToken*/ undefined, name, 
+                /*questionToken*/ undefined, indexerTypeNode, 
+                /*initializer*/ undefined);
                 var typeNode = typeToTypeNodeHelper(indexInfo.type || anyType, context);
-                if (!indexInfo.type && !(context.flags & 2097152)) {
+                if (!indexInfo.type && !(context.flags & 2097152 /* AllowEmptyIndexInfoType */)) {
                     context.encounteredError = true;
                 }
-                return ts.createIndexSignature(undefined, indexInfo.isReadonly ? [ts.createToken(132)] : undefined, [indexingParameter], typeNode);
+                return ts.createIndexSignature(
+                /*decorators*/ undefined, indexInfo.isReadonly ? [ts.createToken(132 /* ReadonlyKeyword */)] : undefined, [indexingParameter], typeNode);
             }
             function signatureToSignatureDeclarationHelper(signature, kind, context) {
                 var typeParameters;
                 var typeArguments;
-                if (context.flags & 32 && signature.target && signature.mapper && signature.target.typeParameters) {
+                if (context.flags & 32 /* WriteTypeArgumentsOfSignature */ && signature.target && signature.mapper && signature.target.typeParameters) {
                     typeArguments = signature.target.typeParameters.map(function (parameter) { return typeToTypeNodeHelper(instantiateType(parameter, signature.mapper), context); });
                 }
                 else {
                     typeParameters = signature.typeParameters && signature.typeParameters.map(function (parameter) { return typeParameterToDeclaration(parameter, context); });
                 }
-                var parameters = signature.parameters.map(function (parameter) { return symbolToParameterDeclaration(parameter, context, kind === 155); });
+                var parameters = signature.parameters.map(function (parameter) { return symbolToParameterDeclaration(parameter, context, kind === 155 /* Constructor */); });
                 if (signature.thisParameter) {
                     var thisParameter = symbolToParameterDeclaration(signature.thisParameter, context);
                     parameters.unshift(thisParameter);
@@ -24319,8 +32293,8 @@ var ts;
                 var returnTypeNode;
                 var typePredicate = getTypePredicateOfSignature(signature);
                 if (typePredicate) {
-                    var parameterName = typePredicate.kind === 1 ?
-                        ts.setEmitFlags(ts.createIdentifier(typePredicate.parameterName), 16777216) :
+                    var parameterName = typePredicate.kind === 1 /* Identifier */ ?
+                        ts.setEmitFlags(ts.createIdentifier(typePredicate.parameterName), 16777216 /* NoAsciiEscaping */) :
                         ts.createThisTypeNode();
                     var typeNode = typeToTypeNodeHelper(typePredicate.type, context);
                     returnTypeNode = ts.createTypePredicateNode(parameterName, typeNode);
@@ -24329,29 +32303,29 @@ var ts;
                     var returnType = getReturnTypeOfSignature(signature);
                     returnTypeNode = returnType && typeToTypeNodeHelper(returnType, context);
                 }
-                if (context.flags & 256) {
-                    if (returnTypeNode && returnTypeNode.kind === 119) {
+                if (context.flags & 256 /* SuppressAnyReturnType */) {
+                    if (returnTypeNode && returnTypeNode.kind === 119 /* AnyKeyword */) {
                         returnTypeNode = undefined;
                     }
                 }
                 else if (!returnTypeNode) {
-                    returnTypeNode = ts.createKeywordTypeNode(119);
+                    returnTypeNode = ts.createKeywordTypeNode(119 /* AnyKeyword */);
                 }
                 return ts.createSignatureDeclaration(kind, typeParameters, parameters, returnTypeNode, typeArguments);
             }
             function typeParameterShadowsNameInScope(type, context) {
-                return !!resolveName(context.enclosingDeclaration, type.symbol.escapedName, 67901928, undefined, type.symbol.escapedName, false);
+                return !!resolveName(context.enclosingDeclaration, type.symbol.escapedName, 67901928 /* Type */, /*nameNotFoundArg*/ undefined, type.symbol.escapedName, /*isUse*/ false);
             }
             function typeParameterToDeclarationWithConstraint(type, context, constraintNode) {
                 var savedContextFlags = context.flags;
-                context.flags &= ~512;
-                var shouldUseGeneratedName = context.flags & 4 &&
+                context.flags &= ~512 /* WriteTypeParametersInQualifiedName */; // Avoids potential infinite loop when building for a claimspace with a generic
+                var shouldUseGeneratedName = context.flags & 4 /* GenerateNamesForShadowedTypeParams */ &&
                     type.symbol.declarations[0] &&
                     ts.isTypeParameterDeclaration(type.symbol.declarations[0]) &&
                     typeParameterShadowsNameInScope(type, context);
                 var name = shouldUseGeneratedName
-                    ? ts.getGeneratedNameForNode(type.symbol.declarations[0].name, 16 | 8)
-                    : symbolToName(type.symbol, context, 67901928, true);
+                    ? ts.getGeneratedNameForNode(type.symbol.declarations[0].name, 16 /* Optimistic */ | 8 /* ReservedInNestedScopes */)
+                    : symbolToName(type.symbol, context, 67901928 /* Type */, /*expectsIdentifier*/ true);
                 var defaultParameter = getDefaultFromTypeParameter(type);
                 var defaultParameterNode = defaultParameter && typeToTypeNodeHelper(defaultParameter, context);
                 context.flags = savedContextFlags;
@@ -24363,60 +32337,65 @@ var ts;
                 return typeParameterToDeclarationWithConstraint(type, context, constraintNode);
             }
             function symbolToParameterDeclaration(parameterSymbol, context, preserveModifierFlags) {
-                var parameterDeclaration = ts.getDeclarationOfKind(parameterSymbol, 149);
+                var parameterDeclaration = ts.getDeclarationOfKind(parameterSymbol, 149 /* Parameter */);
                 if (!parameterDeclaration && !isTransientSymbol(parameterSymbol)) {
-                    parameterDeclaration = ts.getDeclarationOfKind(parameterSymbol, 293);
+                    parameterDeclaration = ts.getDeclarationOfKind(parameterSymbol, 293 /* JSDocParameterTag */);
                 }
                 var parameterType = getTypeOfSymbol(parameterSymbol);
                 if (parameterDeclaration && isRequiredInitializedParameter(parameterDeclaration)) {
                     parameterType = getOptionalType(parameterType);
                 }
                 var parameterTypeNode = typeToTypeNodeHelper(parameterType, context);
-                var modifiers = !(context.flags & 8192) && preserveModifierFlags && parameterDeclaration && parameterDeclaration.modifiers ? parameterDeclaration.modifiers.map(ts.getSynthesizedClone) : undefined;
+                var modifiers = !(context.flags & 8192 /* OmitParameterModifiers */) && preserveModifierFlags && parameterDeclaration && parameterDeclaration.modifiers ? parameterDeclaration.modifiers.map(ts.getSynthesizedClone) : undefined;
                 var isRest = parameterDeclaration ? ts.isRestParameter(parameterDeclaration) : parameterSymbol.isRestParameter;
-                var dotDotDotToken = isRest ? ts.createToken(24) : undefined;
+                var dotDotDotToken = isRest ? ts.createToken(24 /* DotDotDotToken */) : undefined;
                 var name = parameterDeclaration
                     ? parameterDeclaration.name ?
-                        parameterDeclaration.name.kind === 71 ? ts.setEmitFlags(ts.getSynthesizedClone(parameterDeclaration.name), 16777216) :
-                            parameterDeclaration.name.kind === 146 ? ts.setEmitFlags(ts.getSynthesizedClone(parameterDeclaration.name.right), 16777216) :
+                        parameterDeclaration.name.kind === 71 /* Identifier */ ? ts.setEmitFlags(ts.getSynthesizedClone(parameterDeclaration.name), 16777216 /* NoAsciiEscaping */) :
+                            parameterDeclaration.name.kind === 146 /* QualifiedName */ ? ts.setEmitFlags(ts.getSynthesizedClone(parameterDeclaration.name.right), 16777216 /* NoAsciiEscaping */) :
                                 cloneBindingName(parameterDeclaration.name) :
                         ts.symbolName(parameterSymbol)
                     : ts.symbolName(parameterSymbol);
-                var questionToken = parameterDeclaration && isOptionalParameter(parameterDeclaration) ? ts.createToken(55) : undefined;
-                var parameterNode = ts.createParameter(undefined, modifiers, dotDotDotToken, name, questionToken, parameterTypeNode, undefined);
+                var questionToken = parameterDeclaration && isOptionalParameter(parameterDeclaration) ? ts.createToken(55 /* QuestionToken */) : undefined;
+                var parameterNode = ts.createParameter(
+                /*decorators*/ undefined, modifiers, dotDotDotToken, name, questionToken, parameterTypeNode, 
+                /*initializer*/ undefined);
                 return parameterNode;
                 function cloneBindingName(node) {
                     return elideInitializerAndSetEmitFlags(node);
                     function elideInitializerAndSetEmitFlags(node) {
-                        var visited = ts.visitEachChild(node, elideInitializerAndSetEmitFlags, ts.nullTransformationContext, undefined, elideInitializerAndSetEmitFlags);
+                        var visited = ts.visitEachChild(node, elideInitializerAndSetEmitFlags, ts.nullTransformationContext, /*nodesVisitor*/ undefined, elideInitializerAndSetEmitFlags);
                         var clone = ts.nodeIsSynthesized(visited) ? visited : ts.getSynthesizedClone(visited);
-                        if (clone.kind === 182) {
+                        if (clone.kind === 182 /* BindingElement */) {
                             clone.initializer = undefined;
                         }
-                        return ts.setEmitFlags(clone, 1 | 16777216);
+                        return ts.setEmitFlags(clone, 1 /* SingleLine */ | 16777216 /* NoAsciiEscaping */);
                     }
                 }
             }
             function lookupSymbolChain(symbol, context, meaning, yieldModuleSymbol) {
-                context.tracker.trackSymbol(symbol, context.enclosingDeclaration, meaning);
+                context.tracker.trackSymbol(symbol, context.enclosingDeclaration, meaning); // TODO: GH#18217
+                // Try to get qualified name if the symbol is not a type parameter and there is an enclosing declaration.
                 var chain;
-                var isTypeParameter = symbol.flags & 262144;
-                if (!isTypeParameter && (context.enclosingDeclaration || context.flags & 64)) {
-                    chain = ts.Debug.assertDefined(getSymbolChain(symbol, meaning, true));
+                var isTypeParameter = symbol.flags & 262144 /* TypeParameter */;
+                if (!isTypeParameter && (context.enclosingDeclaration || context.flags & 64 /* UseFullyQualifiedType */)) {
+                    chain = ts.Debug.assertDefined(getSymbolChain(symbol, meaning, /*endOfChain*/ true));
                     ts.Debug.assert(chain && chain.length > 0);
                 }
                 else {
                     chain = [symbol];
                 }
                 return chain;
+                /** @param endOfChain Set to false for recursive calls; non-recursive calls should always output something. */
                 function getSymbolChain(symbol, meaning, endOfChain) {
-                    var accessibleSymbolChain = getAccessibleSymbolChain(symbol, context.enclosingDeclaration, meaning, !!(context.flags & 128));
+                    var accessibleSymbolChain = getAccessibleSymbolChain(symbol, context.enclosingDeclaration, meaning, !!(context.flags & 128 /* UseOnlyExternalAliasing */));
                     var parentSymbol;
                     if (!accessibleSymbolChain ||
                         needsQualification(accessibleSymbolChain[0], context.enclosingDeclaration, accessibleSymbolChain.length === 1 ? meaning : getQualifiedLeftMeaning(meaning))) {
+                        // Go up and add our parent.
                         var parent = getContainerOfSymbol(accessibleSymbolChain ? accessibleSymbolChain[0] : symbol);
                         if (parent) {
-                            var parentChain = getSymbolChain(parent, getQualifiedLeftMeaning(meaning), false);
+                            var parentChain = getSymbolChain(parent, getQualifiedLeftMeaning(meaning), /*endOfChain*/ false);
                             if (parentChain) {
                                 parentSymbol = parent;
                                 accessibleSymbolChain = parentChain.concat(accessibleSymbolChain || [getAliasForSymbolInContainer(parent, symbol) || symbol]);
@@ -24426,9 +32405,13 @@ var ts;
                     if (accessibleSymbolChain) {
                         return accessibleSymbolChain;
                     }
-                    if (endOfChain ||
+                    if (
+                    // If this is the last part of outputting the symbol, always output. The cases apply only to parent symbols.
+                    endOfChain ||
+                        // If a parent symbol is an external module, don't write it. (We prefer just `x` vs `"foo/bar".x`.)
                         (yieldModuleSymbol || !(!parentSymbol && ts.forEach(symbol.declarations, hasNonGlobalAugmentationExternalModuleSymbol))) &&
-                            !(symbol.flags & (2048 | 4096))) {
+                            // If a parent symbol is an anonymous type, don't write it.
+                            !(symbol.flags & (2048 /* TypeLiteral */ | 4096 /* ObjectLiteral */))) {
                         return [symbol];
                     }
                 }
@@ -24436,7 +32419,7 @@ var ts;
             function typeParametersToTypeParameterDeclarations(symbol, context) {
                 var typeParameterNodes;
                 var targetSymbol = getTargetSymbol(symbol);
-                if (targetSymbol.flags & (32 | 64 | 524288)) {
+                if (targetSymbol.flags & (32 /* Class */ | 64 /* Interface */ | 524288 /* TypeAlias */)) {
                     typeParameterNodes = ts.createNodeArray(ts.map(getLocalTypeParametersOfClassOrInterfaceOrTypeAlias(symbol), function (tp) { return typeParameterToDeclaration(tp, context); }));
                 }
                 return typeParameterNodes;
@@ -24445,11 +32428,11 @@ var ts;
                 ts.Debug.assert(chain && 0 <= index && index < chain.length);
                 var symbol = chain[index];
                 var typeParameterNodes;
-                if (context.flags & 512 && index < (chain.length - 1)) {
+                if (context.flags & 512 /* WriteTypeParametersInQualifiedName */ && index < (chain.length - 1)) {
                     var parentSymbol = symbol;
                     var nextSymbol = chain[index + 1];
-                    if (ts.getCheckFlags(nextSymbol) & 1) {
-                        var params = getTypeParametersOfClassOrInterface(parentSymbol.flags & 2097152 ? resolveAlias(parentSymbol) : parentSymbol);
+                    if (ts.getCheckFlags(nextSymbol) & 1 /* Instantiated */) {
+                        var params = getTypeParametersOfClassOrInterface(parentSymbol.flags & 2097152 /* Alias */ ? resolveAlias(parentSymbol) : parentSymbol);
                         typeParameterNodes = mapToTypeNodes(ts.map(params, nextSymbol.mapper), context);
                     }
                     else {
@@ -24458,6 +32441,9 @@ var ts;
                 }
                 return typeParameterNodes;
             }
+            /**
+             * Given A[B][C][D], finds A[B]
+             */
             function getTopmostIndexedAccessType(top) {
                 if (ts.isIndexedAccessTypeNode(top.objectType)) {
                     return getTopmostIndexedAccessType(top.objectType);
@@ -24465,12 +32451,13 @@ var ts;
                 return top;
             }
             function symbolToTypeNode(symbol, context, meaning, overrideTypeArguments) {
-                var chain = lookupSymbolChain(symbol, context, meaning, !(context.flags & 16384));
-                context.flags |= 16777216;
+                var chain = lookupSymbolChain(symbol, context, meaning, !(context.flags & 16384 /* UseAliasDefinedOutsideCurrentScope */)); // If we're using aliases outside the current scope, dont bother with the module
+                context.flags |= 16777216 /* InInitialEntityName */;
                 var rootName = getNameOfSymbolAsWritten(chain[0], context);
-                context.flags ^= 16777216;
-                var isTypeOf = meaning === 67216319;
+                context.flags ^= 16777216 /* InInitialEntityName */;
+                var isTypeOf = meaning === 67216319 /* Value */;
                 if (ambientModuleSymbolRegex.test(rootName)) {
+                    // module is root, must use `ImportTypeNode`
                     var nonRootParts = chain.length > 1 ? createAccessFromSymbolChain(chain, chain.length - 1, 1) : undefined;
                     var typeParameterNodes = overrideTypeArguments || lookupTypeParameterNodes(chain, 0, context);
                     var lit = ts.createLiteralTypeNode(ts.createLiteral(rootName.substring(1, rootName.length - 1)));
@@ -24489,7 +32476,7 @@ var ts;
                 }
                 var entityName = createAccessFromSymbolChain(chain, chain.length - 1, 0);
                 if (ts.isIndexedAccessTypeNode(entityName)) {
-                    return entityName;
+                    return entityName; // Indexed accesses can never be `typeof`
                 }
                 if (isTypeOf) {
                     return ts.createTypeQueryNode(entityName);
@@ -24504,14 +32491,15 @@ var ts;
                     var typeParameterNodes = index === (chain.length - 1) ? overrideTypeArguments : lookupTypeParameterNodes(chain, index, context);
                     var symbol = chain[index];
                     if (index === 0) {
-                        context.flags |= 16777216;
+                        context.flags |= 16777216 /* InInitialEntityName */;
                     }
                     var symbolName = getNameOfSymbolAsWritten(symbol, context);
                     if (index === 0) {
-                        context.flags ^= 16777216;
+                        context.flags ^= 16777216 /* InInitialEntityName */;
                     }
                     var parent = chain[index - 1];
-                    if (!(context.flags & 16) && parent && getMembersOfSymbol(parent) && getMembersOfSymbol(parent).get(symbol.escapedName) === symbol) {
+                    if (!(context.flags & 16 /* ForbidIndexedAccessSymbolReferences */) && parent && getMembersOfSymbol(parent) && getMembersOfSymbol(parent).get(symbol.escapedName) === symbol) {
+                        // Should use an indexed access
                         var LHS = createAccessFromSymbolChain(chain, index - 1, stopper);
                         if (ts.isIndexedAccessTypeNode(LHS)) {
                             return ts.createIndexedAccessTypeNode(LHS, ts.createLiteralTypeNode(ts.createLiteral(symbolName)));
@@ -24520,7 +32508,7 @@ var ts;
                             return ts.createIndexedAccessTypeNode(ts.createTypeReferenceNode(LHS, typeParameterNodes), ts.createLiteralTypeNode(ts.createLiteral(symbolName)));
                         }
                     }
-                    var identifier = ts.setEmitFlags(ts.createIdentifier(symbolName, typeParameterNodes), 16777216);
+                    var identifier = ts.setEmitFlags(ts.createIdentifier(symbolName, typeParameterNodes), 16777216 /* NoAsciiEscaping */);
                     identifier.symbol = symbol;
                     if (index > stopper) {
                         var LHS = createAccessFromSymbolChain(chain, index - 1, stopper);
@@ -24536,7 +32524,7 @@ var ts;
                 var chain = lookupSymbolChain(symbol, context, meaning);
                 if (expectsIdentifier && chain.length !== 1
                     && !context.encounteredError
-                    && !(context.flags & 65536)) {
+                    && !(context.flags & 65536 /* AllowQualifedNameInPlaceOfIdentifier */)) {
                     context.encounteredError = true;
                 }
                 return createEntityNameFromSymbolChain(chain, chain.length - 1);
@@ -24544,13 +32532,13 @@ var ts;
                     var typeParameterNodes = lookupTypeParameterNodes(chain, index, context);
                     var symbol = chain[index];
                     if (index === 0) {
-                        context.flags |= 16777216;
+                        context.flags |= 16777216 /* InInitialEntityName */;
                     }
                     var symbolName = getNameOfSymbolAsWritten(symbol, context);
                     if (index === 0) {
-                        context.flags ^= 16777216;
+                        context.flags ^= 16777216 /* InInitialEntityName */;
                     }
-                    var identifier = ts.setEmitFlags(ts.createIdentifier(symbolName, typeParameterNodes), 16777216);
+                    var identifier = ts.setEmitFlags(ts.createIdentifier(symbolName, typeParameterNodes), 16777216 /* NoAsciiEscaping */);
                     identifier.symbol = symbol;
                     return index > 0 ? ts.createQualifiedName(createEntityNameFromSymbolChain(chain, index - 1), identifier) : identifier;
                 }
@@ -24562,34 +32550,34 @@ var ts;
                     var typeParameterNodes = lookupTypeParameterNodes(chain, index, context);
                     var symbol = chain[index];
                     if (index === 0) {
-                        context.flags |= 16777216;
+                        context.flags |= 16777216 /* InInitialEntityName */;
                     }
                     var symbolName = getNameOfSymbolAsWritten(symbol, context);
                     if (index === 0) {
-                        context.flags ^= 16777216;
+                        context.flags ^= 16777216 /* InInitialEntityName */;
                     }
                     var firstChar = symbolName.charCodeAt(0);
                     var canUsePropertyAccess = ts.isIdentifierStart(firstChar, languageVersion);
                     if (index === 0 || canUsePropertyAccess) {
-                        var identifier = ts.setEmitFlags(ts.createIdentifier(symbolName, typeParameterNodes), 16777216);
+                        var identifier = ts.setEmitFlags(ts.createIdentifier(symbolName, typeParameterNodes), 16777216 /* NoAsciiEscaping */);
                         identifier.symbol = symbol;
                         return index > 0 ? ts.createPropertyAccess(createExpressionFromSymbolChain(chain, index - 1), identifier) : identifier;
                     }
                     else {
-                        if (firstChar === 91) {
+                        if (firstChar === 91 /* openBracket */) {
                             symbolName = symbolName.substring(1, symbolName.length - 1);
                             firstChar = symbolName.charCodeAt(0);
                         }
                         var expression = void 0;
                         if (ts.isSingleOrDoubleQuote(firstChar)) {
                             expression = ts.createLiteral(symbolName.substring(1, symbolName.length - 1).replace(/\\./g, function (s) { return s.substring(1); }));
-                            expression.singleQuote = firstChar === 39;
+                            expression.singleQuote = firstChar === 39 /* singleQuote */;
                         }
                         else if (("" + +symbolName) === symbolName) {
                             expression = ts.createLiteral(+symbolName);
                         }
                         if (!expression) {
-                            expression = ts.setEmitFlags(ts.createIdentifier(symbolName, typeParameterNodes), 16777216);
+                            expression = ts.setEmitFlags(ts.createIdentifier(symbolName, typeParameterNodes), 16777216 /* NoAsciiEscaping */);
                             expression.symbol = symbol;
                         }
                         return ts.createElementAccess(createExpressionFromSymbolChain(chain, index - 1), expression);
@@ -24598,13 +32586,13 @@ var ts;
             }
         }
         function typePredicateToString(typePredicate, enclosingDeclaration, flags, writer) {
-            if (flags === void 0) { flags = 16384; }
+            if (flags === void 0) { flags = 16384 /* UseAliasDefinedOutsideCurrentScope */; }
             return writer ? typePredicateToStringWorker(writer).getText() : ts.usingSingleLineStringWriter(typePredicateToStringWorker);
             function typePredicateToStringWorker(writer) {
-                var predicate = ts.createTypePredicateNode(typePredicate.kind === 1 ? ts.createIdentifier(typePredicate.parameterName) : ts.createThisTypeNode(), nodeBuilder.typeToTypeNode(typePredicate.type, enclosingDeclaration, toNodeBuilderFlags(flags) | 3112960 | 512));
+                var predicate = ts.createTypePredicateNode(typePredicate.kind === 1 /* Identifier */ ? ts.createIdentifier(typePredicate.parameterName) : ts.createThisTypeNode(), nodeBuilder.typeToTypeNode(typePredicate.type, enclosingDeclaration, toNodeBuilderFlags(flags) | 3112960 /* IgnoreErrors */ | 512 /* WriteTypeParametersInQualifiedName */));
                 var printer = ts.createPrinter({ removeComments: true });
                 var sourceFile = enclosingDeclaration && ts.getSourceFileOfNode(enclosingDeclaration);
-                printer.writeNode(4, predicate, sourceFile, writer);
+                printer.writeNode(4 /* Unspecified */, predicate, /*sourceFile*/ sourceFile, writer);
                 return writer;
             }
         }
@@ -24614,10 +32602,10 @@ var ts;
             for (var i = 0; i < types.length; i++) {
                 var t = types[i];
                 flags |= t.flags;
-                if (!(t.flags & 24576)) {
-                    if (t.flags & (256 | 512)) {
-                        var baseType = t.flags & 256 ? booleanType : getBaseTypeOfEnumLiteralType(t);
-                        if (baseType.flags & 262144) {
+                if (!(t.flags & 24576 /* Nullable */)) {
+                    if (t.flags & (256 /* BooleanLiteral */ | 512 /* EnumLiteral */)) {
+                        var baseType = t.flags & 256 /* BooleanLiteral */ ? booleanType : getBaseTypeOfEnumLiteralType(t);
+                        if (baseType.flags & 262144 /* Union */) {
                             var count = baseType.types.length;
                             if (i + count <= types.length && types[i + count - 1] === baseType.types[count - 1]) {
                                 result.push(baseType);
@@ -24629,25 +32617,25 @@ var ts;
                     result.push(t);
                 }
             }
-            if (flags & 16384)
+            if (flags & 16384 /* Null */)
                 result.push(nullType);
-            if (flags & 8192)
+            if (flags & 8192 /* Undefined */)
                 result.push(undefinedType);
             return result || types;
         }
         function visibilityToString(flags) {
-            if (flags === 8) {
+            if (flags === 8 /* Private */) {
                 return "private";
             }
-            if (flags === 16) {
+            if (flags === 16 /* Protected */) {
                 return "protected";
             }
             return "public";
         }
         function getTypeAliasForTypeLiteral(type) {
-            if (type.symbol && type.symbol.flags & 2048) {
-                var node = ts.findAncestor(type.symbol.declarations[0].parent, function (n) { return n.kind !== 173; });
-                if (node.kind === 237) {
+            if (type.symbol && type.symbol.flags & 2048 /* TypeLiteral */) {
+                var node = ts.findAncestor(type.symbol.declarations[0].parent, function (n) { return n.kind !== 173 /* ParenthesizedType */; });
+                if (node.kind === 237 /* TypeAliasDeclaration */) {
                     return getSymbolOfNode(node);
                 }
             }
@@ -24655,35 +32643,47 @@ var ts;
         }
         function isTopLevelInExternalModuleAugmentation(node) {
             return node && node.parent &&
-                node.parent.kind === 240 &&
+                node.parent.kind === 240 /* ModuleBlock */ &&
                 ts.isExternalModuleAugmentation(node.parent.parent);
         }
         function isDefaultBindingContext(location) {
-            return location.kind === 274 || ts.isAmbientModule(location);
+            return location.kind === 274 /* SourceFile */ || ts.isAmbientModule(location);
         }
+        /**
+         * Gets a human-readable name for a symbol.
+         * Should *not* be used for the right-hand side of a `.` -- use `symbolName(symbol)` for that instead.
+         *
+         * Unlike `symbolName(symbol)`, this will include quotes if the name is from a string literal.
+         * It will also use a representation of a number as written instead of a decimal form, e.g. `0o11` instead of `9`.
+         */
         function getNameOfSymbolAsWritten(symbol, context) {
-            if (context && symbol.escapedName === "default" && !(context.flags & 16384) &&
-                (!(context.flags & 16777216) ||
+            if (context && symbol.escapedName === "default" /* Default */ && !(context.flags & 16384 /* UseAliasDefinedOutsideCurrentScope */) &&
+                // If it's not the first part of an entity name, it must print as `default`
+                (!(context.flags & 16777216 /* InInitialEntityName */) ||
+                    // if the symbol is synthesized, it will only be referenced externally it must print as `default`
                     !symbol.declarations ||
+                    // if not in the same binding context (source file, module declaration), it must print as `default`
                     (context.enclosingDeclaration && ts.findAncestor(symbol.declarations[0], isDefaultBindingContext) !== ts.findAncestor(context.enclosingDeclaration, isDefaultBindingContext)))) {
                 return "default";
             }
             if (symbol.declarations && symbol.declarations.length) {
-                if (ts.some(symbol.declarations, hasExternalModuleSymbol) && context.enclosingDeclaration) {
-                    var file_3 = ts.getDeclarationOfKind(symbol, 274);
-                    if (!file_3 || !context.tracker.moduleResolverHost) {
+                if (ts.some(symbol.declarations, hasExternalModuleSymbol) && context.enclosingDeclaration) { // TODO: GH#18217
+                    var file = ts.getDeclarationOfKind(symbol, 274 /* SourceFile */);
+                    if (!file || !context.tracker.moduleResolverHost) {
                         if (context.tracker.trackReferencedAmbientModule) {
                             var ambientDecls = ts.filter(symbol.declarations, ts.isAmbientModule);
                             if (ts.length(ambientDecls)) {
                                 for (var _i = 0, ambientDecls_1 = ambientDecls; _i < ambientDecls_1.length; _i++) {
                                     var decl = ambientDecls_1[_i];
-                                    context.tracker.trackReferencedAmbientModule(decl);
+                                    context.tracker.trackReferencedAmbientModule(decl); // TODO: GH#18217
                                 }
                             }
                         }
+                        // ambient module, just use declaration/symbol name (fallthrough)
                     }
                     else {
-                        return "\"" + ts.getResolvedExternalModuleName(context.tracker.moduleResolverHost, file_3, ts.getSourceFileOfNode(ts.getOriginalNode(context.enclosingDeclaration))) + "\"";
+                        var contextFile = ts.getSourceFileOfNode(ts.getOriginalNode(context.enclosingDeclaration));
+                        return "\"" + (file.moduleName || ts.moduleSpecifiers.getModuleSpecifier(compilerOptions, contextFile, contextFile.path, file.path, context.tracker.moduleResolverHost)) + "\"";
                     }
                 }
                 var declaration = symbol.declarations[0];
@@ -24691,26 +32691,26 @@ var ts;
                 if (name) {
                     return ts.declarationNameToString(name);
                 }
-                if (declaration.parent && declaration.parent.kind === 232) {
+                if (declaration.parent && declaration.parent.kind === 232 /* VariableDeclaration */) {
                     return ts.declarationNameToString(declaration.parent.name);
                 }
-                if (context && !context.encounteredError && !(context.flags & 131072)) {
+                if (context && !context.encounteredError && !(context.flags & 131072 /* AllowAnonymousIdentifier */)) {
                     context.encounteredError = true;
                 }
                 switch (declaration.kind) {
-                    case 205:
+                    case 205 /* ClassExpression */:
                         return "(Anonymous class)";
-                    case 192:
-                    case 193:
+                    case 192 /* FunctionExpression */:
+                    case 193 /* ArrowFunction */:
                         return "(Anonymous function)";
                 }
             }
             var nameType = symbol.nameType;
             if (nameType) {
-                if (nameType.flags & 64 && !ts.isIdentifierText(nameType.value, compilerOptions.target)) {
-                    return "\"" + ts.escapeString(nameType.value, 34) + "\"";
+                if (nameType.flags & 64 /* StringLiteral */ && !ts.isIdentifierText(nameType.value, compilerOptions.target)) {
+                    return "\"" + ts.escapeString(nameType.value, 34 /* doubleQuote */) + "\"";
                 }
-                if (nameType && nameType.flags & 2048) {
+                if (nameType && nameType.flags & 2048 /* UniqueESSymbol */) {
                     return "[" + getNameOfSymbolAsWritten(nameType.symbol, context) + "]";
                 }
             }
@@ -24727,66 +32727,81 @@ var ts;
             return false;
             function determineIfDeclarationIsVisible() {
                 switch (node.kind) {
-                    case 292:
-                    case 297:
+                    case 292 /* JSDocCallbackTag */:
+                    case 297 /* JSDocTypedefTag */:
+                        // Top-level jsdoc type aliases are considered exported
+                        // First parent is comment node, second is hosting declaration or token; we only care about those tokens or declarations whose parent is a source file
                         return !!(node.parent && node.parent.parent && node.parent.parent.parent && ts.isSourceFile(node.parent.parent.parent));
-                    case 182:
+                    case 182 /* BindingElement */:
                         return isDeclarationVisible(node.parent.parent);
-                    case 232:
+                    case 232 /* VariableDeclaration */:
                         if (ts.isBindingPattern(node.name) &&
                             !node.name.elements.length) {
+                            // If the binding pattern is empty, this variable declaration is not visible
                             return false;
                         }
-                    case 239:
-                    case 235:
-                    case 236:
-                    case 237:
-                    case 234:
-                    case 238:
-                    case 243:
+                    // falls through
+                    case 239 /* ModuleDeclaration */:
+                    case 235 /* ClassDeclaration */:
+                    case 236 /* InterfaceDeclaration */:
+                    case 237 /* TypeAliasDeclaration */:
+                    case 234 /* FunctionDeclaration */:
+                    case 238 /* EnumDeclaration */:
+                    case 243 /* ImportEqualsDeclaration */:
+                        // external module augmentation is always visible
                         if (ts.isExternalModuleAugmentation(node)) {
                             return true;
                         }
                         var parent = getDeclarationContainer(node);
-                        if (!(ts.getCombinedModifierFlags(node) & 1) &&
-                            !(node.kind !== 243 && parent.kind !== 274 && parent.flags & 4194304)) {
+                        // If the node is not exported or it is not ambient module element (except import declaration)
+                        if (!(ts.getCombinedModifierFlags(node) & 1 /* Export */) &&
+                            !(node.kind !== 243 /* ImportEqualsDeclaration */ && parent.kind !== 274 /* SourceFile */ && parent.flags & 4194304 /* Ambient */)) {
                             return isGlobalSourceFile(parent);
                         }
+                        // Exported members/ambient module elements (exception import declaration) are visible if parent is visible
                         return isDeclarationVisible(parent);
-                    case 152:
-                    case 151:
-                    case 156:
-                    case 157:
-                    case 154:
-                    case 153:
-                        if (ts.hasModifier(node, 8 | 16)) {
+                    case 152 /* PropertyDeclaration */:
+                    case 151 /* PropertySignature */:
+                    case 156 /* GetAccessor */:
+                    case 157 /* SetAccessor */:
+                    case 154 /* MethodDeclaration */:
+                    case 153 /* MethodSignature */:
+                        if (ts.hasModifier(node, 8 /* Private */ | 16 /* Protected */)) {
+                            // Private/protected properties/methods are not visible
                             return false;
                         }
-                    case 155:
-                    case 159:
-                    case 158:
-                    case 160:
-                    case 149:
-                    case 240:
-                    case 163:
-                    case 164:
-                    case 166:
-                    case 162:
-                    case 167:
-                    case 168:
-                    case 169:
-                    case 170:
-                    case 173:
+                    // Public properties/methods are visible if its parents are visible, so:
+                    // falls through
+                    case 155 /* Constructor */:
+                    case 159 /* ConstructSignature */:
+                    case 158 /* CallSignature */:
+                    case 160 /* IndexSignature */:
+                    case 149 /* Parameter */:
+                    case 240 /* ModuleBlock */:
+                    case 163 /* FunctionType */:
+                    case 164 /* ConstructorType */:
+                    case 166 /* TypeLiteral */:
+                    case 162 /* TypeReference */:
+                    case 167 /* ArrayType */:
+                    case 168 /* TupleType */:
+                    case 169 /* UnionType */:
+                    case 170 /* IntersectionType */:
+                    case 173 /* ParenthesizedType */:
                         return isDeclarationVisible(node.parent);
-                    case 245:
-                    case 246:
-                    case 248:
+                    // Default binding, import specifier and namespace import is visible
+                    // only on demand so by default it is not visible
+                    case 245 /* ImportClause */:
+                    case 246 /* NamespaceImport */:
+                    case 248 /* ImportSpecifier */:
                         return false;
-                    case 148:
-                    case 274:
-                    case 242:
+                    // Type parameters are always visible
+                    case 148 /* TypeParameter */:
+                    // Source file and namespace export are always visible
+                    case 274 /* SourceFile */:
+                    case 242 /* NamespaceExportDeclaration */:
                         return true;
-                    case 249:
+                    // Export assignments do not create name bindings outside the module
+                    case 249 /* ExportAssignment */:
                         return false;
                     default:
                         return false;
@@ -24795,11 +32810,11 @@ var ts;
         }
         function collectLinkedAliases(node, setVisibility) {
             var exportSymbol;
-            if (node.parent && node.parent.kind === 249) {
-                exportSymbol = resolveName(node, node.escapedText, 67216319 | 67901928 | 1920 | 2097152, undefined, node, false);
+            if (node.parent && node.parent.kind === 249 /* ExportAssignment */) {
+                exportSymbol = resolveName(node, node.escapedText, 67216319 /* Value */ | 67901928 /* Type */ | 1920 /* Namespace */ | 2097152 /* Alias */, /*nameNotFoundMessage*/ undefined, node, /*isUse*/ false);
             }
-            else if (node.parent.kind === 252) {
-                exportSymbol = getTargetOfExportSpecifier(node.parent, 67216319 | 67901928 | 1920 | 2097152);
+            else if (node.parent.kind === 252 /* ExportSpecifier */) {
+                exportSymbol = getTargetOfExportSpecifier(node.parent, 67216319 /* Value */ | 67901928 /* Type */ | 1920 /* Namespace */ | 2097152 /* Alias */);
             }
             var result;
             if (exportSymbol) {
@@ -24817,9 +32832,10 @@ var ts;
                         ts.pushIfUnique(result, resultNode);
                     }
                     if (ts.isInternalModuleImportEqualsDeclaration(declaration)) {
+                        // Add the referenced top container visible
                         var internalModuleReference = declaration.moduleReference;
                         var firstIdentifier = getFirstIdentifier(internalModuleReference);
-                        var importSymbol = resolveName(declaration, firstIdentifier.escapedText, 67216319 | 67901928 | 1920, undefined, undefined, false);
+                        var importSymbol = resolveName(declaration, firstIdentifier.escapedText, 67216319 /* Value */ | 67901928 /* Type */ | 1920 /* Namespace */, undefined, undefined, /*isUse*/ false);
                         if (importSymbol) {
                             buildVisibleNodeList(importSymbol.declarations);
                         }
@@ -24827,9 +32843,21 @@ var ts;
                 });
             }
         }
+        /**
+         * Push an entry on the type resolution stack. If an entry with the given target and the given property name
+         * is already on the stack, and no entries in between already have a type, then a circularity has occurred.
+         * In this case, the result values of the existing entry and all entries pushed after it are changed to false,
+         * and the value false is returned. Otherwise, the new entry is just pushed onto the stack, and true is returned.
+         * In order to see if the same query has already been done before, the target object and the propertyName both
+         * must match the one passed in.
+         *
+         * @param target The symbol, type, or signature whose type is being queried
+         * @param propertyName The property name that should be used to query the target for its type
+         */
         function pushTypeResolution(target, propertyName) {
             var resolutionCycleStartIndex = findResolutionCycleStartIndex(target, propertyName);
             if (resolutionCycleStartIndex >= 0) {
+                // A cycle was found
                 var length_2 = resolutionTargets.length;
                 for (var i = resolutionCycleStartIndex; i < length_2; i++) {
                     resolutionResults[i] = false;
@@ -24837,7 +32865,7 @@ var ts;
                 return false;
             }
             resolutionTargets.push(target);
-            resolutionResults.push(true);
+            resolutionResults.push(/*items*/ true);
             resolutionPropertyNames.push(propertyName);
             return true;
         }
@@ -24853,24 +32881,26 @@ var ts;
             return -1;
         }
         function hasType(target, propertyName) {
-            if (propertyName === 0) {
+            if (propertyName === 0 /* Type */) {
                 return !!getSymbolLinks(target).type;
             }
-            if (propertyName === 2) {
+            if (propertyName === 2 /* DeclaredType */) {
                 return !!getSymbolLinks(target).declaredType;
             }
-            if (propertyName === 1) {
+            if (propertyName === 1 /* ResolvedBaseConstructorType */) {
                 return !!target.resolvedBaseConstructorType;
             }
-            if (propertyName === 3) {
+            if (propertyName === 3 /* ResolvedReturnType */) {
                 return !!target.resolvedReturnType;
             }
-            if (propertyName === 4) {
+            if (propertyName === 4 /* ResolvedBaseConstraint */) {
                 var bc = target.resolvedBaseConstraint;
                 return !!bc && bc !== circularConstraintType;
             }
             return ts.Debug.fail("Unhandled TypeSystemPropertyName " + propertyName);
         }
+        // Pop an entry from the type resolution stack and return its associated result value. The result value will
+        // be true if no circularities were detected, or false if a circularity was found.
         function popTypeResolution() {
             resolutionTargets.pop();
             resolutionPropertyNames.pop();
@@ -24879,12 +32909,12 @@ var ts;
         function getDeclarationContainer(node) {
             return ts.findAncestor(ts.getRootDeclaration(node), function (node) {
                 switch (node.kind) {
-                    case 232:
-                    case 233:
-                    case 248:
-                    case 247:
-                    case 246:
-                    case 245:
+                    case 232 /* VariableDeclaration */:
+                    case 233 /* VariableDeclarationList */:
+                    case 248 /* ImportSpecifier */:
+                    case 247 /* NamedImports */:
+                    case 246 /* NamespaceImport */:
+                    case 245 /* ImportClause */:
                         return false;
                     default:
                         return true;
@@ -24892,29 +32922,36 @@ var ts;
             }).parent;
         }
         function getTypeOfPrototypeProperty(prototype) {
+            // TypeScript 1.0 spec (April 2014): 8.4
+            // Every class automatically contains a static property member named 'prototype',
+            // the type of which is an instantiation of the class type with type Any supplied as a type argument for each type parameter.
+            // It is an error to explicitly declare a static property member with the name 'prototype'.
             var classType = getDeclaredTypeOfSymbol(getParentOfSymbol(prototype));
             return classType.typeParameters ? createTypeReference(classType, ts.map(classType.typeParameters, function (_) { return anyType; })) : classType;
         }
+        // Return the type of the given property in the given type, or undefined if no such property exists
         function getTypeOfPropertyOfType(type, name) {
             var prop = getPropertyOfType(type, name);
             return prop ? getTypeOfSymbol(prop) : undefined;
         }
         function isTypeAny(type) {
-            return type && (type.flags & 1) !== 0;
+            return type && (type.flags & 1 /* Any */) !== 0;
         }
+        // Return the type of a binding element parent. We check SymbolLinks first to see if a type has been
+        // assigned by contextual typing.
         function getTypeForBindingElementParent(node) {
             var symbol = getSymbolOfNode(node);
-            return symbol && getSymbolLinks(symbol).type || getTypeForVariableLikeDeclaration(node, false);
+            return symbol && getSymbolLinks(symbol).type || getTypeForVariableLikeDeclaration(node, /*includeOptionality*/ false);
         }
         function isComputedNonLiteralName(name) {
-            return name.kind === 147 && !ts.isStringOrNumericLiteral(name.expression);
+            return name.kind === 147 /* ComputedPropertyName */ && !ts.isStringOrNumericLiteral(name.expression);
         }
         function getRestType(source, properties, symbol) {
-            source = filterType(source, function (t) { return !(t.flags & 24576); });
-            if (source.flags & 32768) {
+            source = filterType(source, function (t) { return !(t.flags & 24576 /* Nullable */); });
+            if (source.flags & 32768 /* Never */) {
                 return emptyObjectType;
             }
-            if (source.flags & 262144) {
+            if (source.flags & 262144 /* Union */) {
                 return mapType(source, function (t) { return getRestType(t, properties, symbol); });
             }
             var members = ts.createSymbolTable();
@@ -24926,22 +32963,27 @@ var ts;
             for (var _a = 0, _b = getPropertiesOfType(source); _a < _b.length; _a++) {
                 var prop = _b[_a];
                 var inNamesToRemove = names.has(prop.escapedName);
-                var isPrivate = ts.getDeclarationModifierFlagsFromSymbol(prop) & (8 | 16);
-                var isSetOnlyAccessor = prop.flags & 65536 && !(prop.flags & 32768);
+                var isPrivate = ts.getDeclarationModifierFlagsFromSymbol(prop) & (8 /* Private */ | 16 /* Protected */);
+                var isSetOnlyAccessor = prop.flags & 65536 /* SetAccessor */ && !(prop.flags & 32768 /* GetAccessor */);
                 if (!inNamesToRemove && !isPrivate && !isClassMethod(prop) && !isSetOnlyAccessor) {
                     members.set(prop.escapedName, getNonReadonlySymbol(prop));
                 }
             }
-            var stringIndexInfo = getIndexInfoOfType(source, 0);
-            var numberIndexInfo = getIndexInfoOfType(source, 1);
+            var stringIndexInfo = getIndexInfoOfType(source, 0 /* String */);
+            var numberIndexInfo = getIndexInfoOfType(source, 1 /* Number */);
             return createAnonymousType(symbol, members, ts.emptyArray, ts.emptyArray, stringIndexInfo, numberIndexInfo);
         }
+        /** Return the inferred type for a binding element */
         function getTypeForBindingElement(declaration) {
             var pattern = declaration.parent;
             var parentType = getTypeForBindingElementParent(pattern.parent);
+            // If parent has the unknown (error) type, then so does this binding element
             if (parentType === errorType) {
                 return errorType;
             }
+            // If no type was specified or inferred for parent,
+            // infer from the initializer of the binding element if one is present.
+            // Otherwise, go with the undefined type of the parent.
             if (!parentType) {
                 return declaration.initializer ? checkDeclarationInitializer(declaration) : parentType;
             }
@@ -24949,9 +32991,9 @@ var ts;
                 return parentType;
             }
             var type;
-            if (pattern.kind === 180) {
+            if (pattern.kind === 180 /* ObjectBindingPattern */) {
                 if (declaration.dotDotDotToken) {
-                    if (parentType.flags & 2 || !isValidSpreadType(parentType)) {
+                    if (parentType.flags & 2 /* Unknown */ || !isValidSpreadType(parentType)) {
                         error(declaration, ts.Diagnostics.Rest_types_may_only_be_created_from_object_types);
                         return errorType;
                     }
@@ -24965,20 +33007,21 @@ var ts;
                     type = getRestType(parentType, literalMembers, declaration.symbol);
                 }
                 else {
+                    // Use explicitly specified property name ({ p: xxx } form), or otherwise the implied name ({ p } form)
                     var name = declaration.propertyName || declaration.name;
                     var isLate = isLateBindableName(name);
                     var isWellKnown = ts.isComputedPropertyName(name) && ts.isWellKnownSymbolSyntactically(name.expression);
                     if (!isLate && !isWellKnown && isComputedNonLiteralName(name)) {
                         var exprType = checkExpression(name.expression);
-                        if (isTypeAssignableToKind(exprType, 3072)) {
+                        if (isTypeAssignableToKind(exprType, 3072 /* ESSymbolLike */)) {
                             if (noImplicitAny) {
                                 error(declaration, ts.Diagnostics.Type_0_cannot_be_used_to_index_type_1, typeToString(exprType), typeToString(parentType));
                             }
                             return anyType;
                         }
-                        var indexerType = isTypeAssignableToKind(exprType, 168) && getIndexTypeOfType(parentType, 1) || getIndexTypeOfType(parentType, 0);
+                        var indexerType = isTypeAssignableToKind(exprType, 168 /* NumberLike */) && getIndexTypeOfType(parentType, 1 /* Number */) || getIndexTypeOfType(parentType, 0 /* String */);
                         if (!indexerType && noImplicitAny && !compilerOptions.suppressImplicitAnyIndexErrors) {
-                            if (getIndexTypeOfType(parentType, 1)) {
+                            if (getIndexTypeOfType(parentType, 1 /* Number */)) {
                                 error(declaration, ts.Diagnostics.Element_implicitly_has_an_any_type_because_index_expression_is_not_of_type_number);
                             }
                             else {
@@ -24987,14 +33030,17 @@ var ts;
                         }
                         return indexerType || anyType;
                     }
+                    // Use type of the specified property, or otherwise, for a numeric name, the type of the numeric index signature,
+                    // or otherwise the type of the string index signature.
                     var nameType = isLate ? checkComputedPropertyName(name) : undefined;
                     var text = isLate ? getLateBoundNameFromType(nameType) :
                         isWellKnown ? ts.getPropertyNameForKnownSymbolName(ts.idText(name.expression.name)) :
                             ts.getTextOfPropertyName(name);
-                    if (strictNullChecks && declaration.flags & 4194304 && ts.isParameterDeclaration(declaration)) {
+                    // Relax null check on ambient destructuring parameters, since the parameters have no implementation and are just documentation
+                    if (strictNullChecks && declaration.flags & 4194304 /* Ambient */ && ts.isParameterDeclaration(declaration)) {
                         parentType = getNonNullableType(parentType);
                     }
-                    if (isLate && nameType && !getPropertyOfType(parentType, text) && isTypeAssignableToKind(nameType, 3072)) {
+                    if (isLate && nameType && !getPropertyOfType(parentType, text) && isTypeAssignableToKind(nameType, 3072 /* ESSymbolLike */)) {
                         if (noImplicitAny) {
                             error(declaration, ts.Diagnostics.Type_0_cannot_be_used_to_index_type_1, typeToString(nameType), typeToString(parentType));
                         }
@@ -25002,8 +33048,8 @@ var ts;
                     }
                     var declaredType = getConstraintForLocation(getTypeOfPropertyOfType(parentType, text), declaration.name);
                     type = declaredType && getFlowTypeOfReference(declaration, declaredType) ||
-                        isNumericLiteralName(text) && getIndexTypeOfType(parentType, 1) ||
-                        getIndexTypeOfType(parentType, 0);
+                        isNumericLiteralName(text) && getIndexTypeOfType(parentType, 1 /* Number */) ||
+                        getIndexTypeOfType(parentType, 0 /* String */);
                     if (!type) {
                         error(name, ts.Diagnostics.Type_0_has_no_property_1_and_no_string_index_signature, typeToString(parentType), ts.declarationNameToString(name));
                         return errorType;
@@ -25011,11 +33057,16 @@ var ts;
                 }
             }
             else {
-                var elementType = checkIteratedTypeOrElementType(parentType, pattern, false, false);
+                // This elementType will be used if the specific property corresponding to this index is not
+                // present (aka the tuple element property). This call also checks that the parentType is in
+                // fact an iterable or array (depending on target language).
+                var elementType = checkIteratedTypeOrElementType(parentType, pattern, /*allowStringInput*/ false, /*allowAsyncIterables*/ false);
                 if (declaration.dotDotDotToken) {
+                    // Rest element has an array type with the same element type as the parent type
                     type = createArrayType(elementType);
                 }
                 else {
+                    // Use specific property type when parent is a tuple or numeric index type when parent is an array
                     var propName = "" + pattern.elements.indexOf(declaration);
                     type = isTupleLikeType(parentType)
                         ? getTypeOfPropertyOfType(parentType, propName)
@@ -25031,11 +33082,13 @@ var ts;
                     }
                 }
             }
-            if (strictNullChecks && declaration.initializer && !(getFalsyFlags(checkExpressionCached(declaration.initializer)) & 8192)) {
-                type = getTypeWithFacts(type, 131072);
+            // In strict null checking mode, if a default value of a non-undefined type is specified, remove
+            // undefined from the final type.
+            if (strictNullChecks && declaration.initializer && !(getFalsyFlags(checkExpressionCached(declaration.initializer)) & 8192 /* Undefined */)) {
+                type = getTypeWithFacts(type, 131072 /* NEUndefined */);
             }
             return declaration.initializer ?
-                getUnionType([type, checkExpressionCached(declaration.initializer)], 2) :
+                getUnionType([type, checkExpressionCached(declaration.initializer)], 2 /* Subtype */) :
                 type;
         }
         function getTypeForDeclarationFromJSDocComment(declaration) {
@@ -25047,22 +33100,29 @@ var ts;
         }
         function isNullOrUndefined(node) {
             var expr = ts.skipParentheses(node);
-            return expr.kind === 95 || expr.kind === 71 && getResolvedSymbol(expr) === undefinedSymbol;
+            return expr.kind === 95 /* NullKeyword */ || expr.kind === 71 /* Identifier */ && getResolvedSymbol(expr) === undefinedSymbol;
         }
         function isEmptyArrayLiteral(node) {
             var expr = ts.skipParentheses(node);
-            return expr.kind === 183 && expr.elements.length === 0;
+            return expr.kind === 183 /* ArrayLiteralExpression */ && expr.elements.length === 0;
         }
         function addOptionality(type, optional) {
             if (optional === void 0) { optional = true; }
             return strictNullChecks && optional ? getOptionalType(type) : type;
         }
+        // Return the inferred type for a variable, parameter, or property declaration
         function getTypeForVariableLikeDeclaration(declaration, includeOptionality) {
-            if (ts.isVariableDeclaration(declaration) && declaration.parent.parent.kind === 221) {
+            // A variable declared in a for..in statement is of type string, or of type keyof T when the
+            // right hand expression is of a type parameter type.
+            if (ts.isVariableDeclaration(declaration) && declaration.parent.parent.kind === 221 /* ForInStatement */) {
                 var indexType = getIndexType(checkNonNullExpression(declaration.parent.parent.expression));
-                return indexType.flags & (65536 | 1048576) ? getExtractStringType(indexType) : stringType;
+                return indexType.flags & (65536 /* TypeParameter */ | 1048576 /* Index */) ? getExtractStringType(indexType) : stringType;
             }
-            if (ts.isVariableDeclaration(declaration) && declaration.parent.parent.kind === 222) {
+            if (ts.isVariableDeclaration(declaration) && declaration.parent.parent.kind === 222 /* ForOfStatement */) {
+                // checkRightHandSideOfForOf will return undefined if the for-of expression type was
+                // missing properties/signatures required to get its iteratedType (like
+                // [Symbol.iterator] or next). This may be because we accessed properties from anyType,
+                // or it may have led to an error inside getElementTypeOfIterable.
                 var forOfStatement = declaration.parent.parent;
                 return checkRightHandSideOfForOf(forOfStatement.expression, forOfStatement.awaitModifier) || anyType;
             }
@@ -25071,34 +33131,43 @@ var ts;
             }
             var isOptional = includeOptionality && (ts.isParameter(declaration) && isJSDocOptionalParameter(declaration)
                 || !ts.isBindingElement(declaration) && !ts.isVariableDeclaration(declaration) && !!declaration.questionToken);
+            // Use type from type annotation if one is present
             var declaredType = tryGetTypeFromEffectiveTypeNode(declaration);
             if (declaredType) {
                 return addOptionality(declaredType, isOptional);
             }
             if ((noImplicitAny || ts.isInJavaScriptFile(declaration)) &&
-                declaration.kind === 232 && !ts.isBindingPattern(declaration.name) &&
-                !(ts.getCombinedModifierFlags(declaration) & 1) && !(declaration.flags & 4194304)) {
-                if (!(ts.getCombinedNodeFlags(declaration) & 2) && (!declaration.initializer || isNullOrUndefined(declaration.initializer))) {
+                declaration.kind === 232 /* VariableDeclaration */ && !ts.isBindingPattern(declaration.name) &&
+                !(ts.getCombinedModifierFlags(declaration) & 1 /* Export */) && !(declaration.flags & 4194304 /* Ambient */)) {
+                // If --noImplicitAny is on or the declaration is in a Javascript file,
+                // use control flow tracked 'any' type for non-ambient, non-exported var or let variables with no
+                // initializer or a 'null' or 'undefined' initializer.
+                if (!(ts.getCombinedNodeFlags(declaration) & 2 /* Const */) && (!declaration.initializer || isNullOrUndefined(declaration.initializer))) {
                     return autoType;
                 }
+                // Use control flow tracked 'any[]' type for non-ambient, non-exported variables with an empty array
+                // literal initializer.
                 if (declaration.initializer && isEmptyArrayLiteral(declaration.initializer)) {
                     return autoArrayType;
                 }
             }
-            if (declaration.kind === 149) {
+            if (declaration.kind === 149 /* Parameter */) {
                 var func = declaration.parent;
-                if (func.kind === 157 && !hasNonBindableDynamicName(func)) {
-                    var getter = ts.getDeclarationOfKind(getSymbolOfNode(declaration.parent), 156);
+                // For a parameter of a set accessor, use the type of the get accessor if one is present
+                if (func.kind === 157 /* SetAccessor */ && !hasNonBindableDynamicName(func)) {
+                    var getter = ts.getDeclarationOfKind(getSymbolOfNode(declaration.parent), 156 /* GetAccessor */);
                     if (getter) {
                         var getterSignature = getSignatureFromDeclaration(getter);
                         var thisParameter = getAccessorThisParameter(func);
                         if (thisParameter && declaration === thisParameter) {
+                            // Use the type from the *getter*
                             ts.Debug.assert(!thisParameter.type);
                             return getTypeOfSymbol(getterSignature.thisParameter);
                         }
                         return getReturnTypeOfSignature(getterSignature);
                     }
                 }
+                // Use contextual parameter type if one is available
                 var type = void 0;
                 if (declaration.symbol.escapedName === "this") {
                     type = getContextualThisParameterType(func);
@@ -25110,19 +33179,25 @@ var ts;
                     return addOptionality(type, isOptional);
                 }
             }
+            // Use the type of the initializer expression if one is present
             if (declaration.initializer) {
                 var type = checkDeclarationInitializer(declaration);
                 return addOptionality(type, isOptional);
             }
             if (ts.isJsxAttribute(declaration)) {
+                // if JSX attribute doesn't have initializer, by default the attribute will have boolean value of true.
+                // I.e <Elem attr /> is sugar for <Elem attr={true} />
                 return trueType;
             }
+            // If the declaration specifies a binding pattern, use the type implied by the binding pattern
             if (ts.isBindingPattern(declaration.name)) {
-                return getTypeFromBindingPattern(declaration.name, false, true);
+                return getTypeFromBindingPattern(declaration.name, /*includePatternInType*/ false, /*reportErrors*/ true);
             }
+            // No type specified and nothing can be inferred
             return undefined;
         }
         function getWidenedTypeFromJSSpecialPropertyDeclarations(symbol) {
+            // function/class/{} assignments are fresh declarations, not property assignments, so only add prototype assignments
             var specialDeclaration = ts.getAssignedJavascriptInitializer(symbol.valueDeclaration);
             if (specialDeclaration) {
                 return getWidenedLiteralType(checkExpressionCached(specialDeclaration));
@@ -25132,20 +33207,22 @@ var ts;
             var definedInConstructor = false;
             var definedInMethod = false;
             var jsDocType;
-            var _loop_3 = function (declaration) {
+            var _loop_1 = function (declaration) {
                 var declarationInConstructor = false;
-                var expression = declaration.kind === 200 ? declaration :
-                    declaration.kind === 185 ? ts.cast(declaration.parent, ts.isBinaryExpression) :
+                var expression = declaration.kind === 200 /* BinaryExpression */ ? declaration :
+                    declaration.kind === 185 /* PropertyAccessExpression */ ? ts.cast(declaration.parent, ts.isBinaryExpression) :
                         undefined;
                 if (!expression) {
                     return { value: errorType };
                 }
                 var special = ts.getSpecialPropertyAssignmentKind(expression);
-                if (special === 4) {
-                    var thisContainer = ts.getThisContainer(expression, false);
-                    declarationInConstructor = thisContainer.kind === 155 ||
-                        thisContainer.kind === 234 ||
-                        (thisContainer.kind === 192 && !ts.isPrototypePropertyAssignment(thisContainer.parent));
+                if (special === 4 /* ThisProperty */) {
+                    var thisContainer = ts.getThisContainer(expression, /*includeArrowFunctions*/ false);
+                    // Properties defined in a constructor (or base constructor, or javascript constructor function) don't get undefined added.
+                    // Function expressions that are assigned to the prototype count as methods.
+                    declarationInConstructor = thisContainer.kind === 155 /* Constructor */ ||
+                        thisContainer.kind === 234 /* FunctionDeclaration */ ||
+                        (thisContainer.kind === 192 /* FunctionExpression */ && !ts.isPrototypePropertyAssignment(thisContainer.parent));
                     if (declarationInConstructor) {
                         definedInConstructor = true;
                     }
@@ -25153,6 +33230,7 @@ var ts;
                         definedInMethod = true;
                     }
                 }
+                // If there is a JSDoc type, use it
                 var type_1 = getTypeForDeclarationFromJSDocComment(expression.parent);
                 if (type_1) {
                     var declarationType = getWidenedType(type_1);
@@ -25161,30 +33239,31 @@ var ts;
                     }
                     else if (jsDocType !== errorType && declarationType !== errorType &&
                         !isTypeIdenticalTo(jsDocType, declarationType) &&
-                        !(symbol.flags & 67108864)) {
+                        !(symbol.flags & 67108864 /* JSContainer */)) {
                         errorNextVariableOrPropertyDeclarationMustHaveSameType(jsDocType, declaration, declarationType);
                     }
                 }
                 else if (!jsDocType) {
+                    // If we don't have an explicit JSDoc type, get the type from the expression.
                     var type_2 = getWidenedLiteralType(checkExpressionCached(expression.right));
-                    if (ts.getObjectFlags(type_2) & 16 &&
-                        special === 2 &&
-                        symbol.escapedName === "export=") {
+                    if (ts.getObjectFlags(type_2) & 16 /* Anonymous */ &&
+                        special === 2 /* ModuleExports */ &&
+                        symbol.escapedName === "export=" /* ExportEquals */) {
                         var exportedType_1 = resolveStructuredTypeMembers(type_2);
-                        var members_3 = ts.createSymbolTable();
-                        ts.copyEntries(exportedType_1.members, members_3);
+                        var members_2 = ts.createSymbolTable();
+                        ts.copyEntries(exportedType_1.members, members_2);
                         symbol.exports.forEach(function (s, name) {
-                            if (members_3.has(name)) {
+                            if (members_2.has(name)) {
                                 var exportedMember = exportedType_1.members.get(name);
                                 var union = createSymbol(s.flags | exportedMember.flags, name);
                                 union.type = getUnionType([getTypeOfSymbol(s), getTypeOfSymbol(exportedMember)]);
-                                members_3.set(name, union);
+                                members_2.set(name, union);
                             }
                             else {
-                                members_3.set(name, s);
+                                members_2.set(name, s);
                             }
                         });
-                        type_2 = createAnonymousType(exportedType_1.symbol, members_3, exportedType_1.callSignatures, exportedType_1.constructSignatures, exportedType_1.stringIndexInfo, exportedType_1.numberIndexInfo);
+                        type_2 = createAnonymousType(exportedType_1.symbol, members_2, exportedType_1.callSignatures, exportedType_1.constructSignatures, exportedType_1.stringIndexInfo, exportedType_1.numberIndexInfo);
                     }
                     var anyedType = type_2;
                     if (isEmptyArrayLiteralType(type_2)) {
@@ -25201,12 +33280,13 @@ var ts;
             };
             for (var _i = 0, _a = symbol.declarations; _i < _a.length; _i++) {
                 var declaration = _a[_i];
-                var state_2 = _loop_3(declaration);
+                var state_2 = _loop_1(declaration);
                 if (typeof state_2 === "object")
                     return state_2.value;
             }
             var type = jsDocType;
             if (!type) {
+                // use only the constructor types unless they were only assigned null | undefined (including widening variants)
                 if (definedInMethod) {
                     var propType = getTypeOfSpecialPropertyOfBaseType(symbol);
                     if (propType) {
@@ -25214,11 +33294,11 @@ var ts;
                         definedInConstructor = true;
                     }
                 }
-                var sourceTypes = ts.some(constructorTypes, function (t) { return !!(t.flags & ~(24576 | 134217728)); }) ? constructorTypes : types;
-                type = getUnionType(sourceTypes, 2);
+                var sourceTypes = ts.some(constructorTypes, function (t) { return !!(t.flags & ~(24576 /* Nullable */ | 134217728 /* ContainsWideningType */)); }) ? constructorTypes : types; // TODO: GH#18217
+                type = getUnionType(sourceTypes, 2 /* Subtype */);
             }
             var widened = getWidenedType(addOptionality(type, definedInMethod && !definedInConstructor));
-            if (filterType(widened, function (t) { return !!(t.flags & ~24576); }) === neverType) {
+            if (filterType(widened, function (t) { return !!(t.flags & ~24576 /* Nullable */); }) === neverType) {
                 if (noImplicitAny) {
                     reportImplicitAnyError(symbol.valueDeclaration, anyType);
                 }
@@ -25226,9 +33306,10 @@ var ts;
             }
             return widened;
         }
+        /** check for definition in base class if any declaration is in a class */
         function getTypeOfSpecialPropertyOfBaseType(specialProperty) {
             var parentDeclaration = ts.forEach(specialProperty.declarations, function (d) {
-                var parent = ts.getThisContainer(d, false).parent;
+                var parent = ts.getThisContainer(d, /*includeArrowFunctions*/ false).parent;
                 return ts.isClassLike(parent) && parent;
             });
             if (parentDeclaration) {
@@ -25239,6 +33320,9 @@ var ts;
                 }
             }
         }
+        // Return the type implied by a binding pattern element. This is the type of the initializer of the element if
+        // one is present. Otherwise, if the element is itself a binding pattern, it is the type implied by the binding
+        // pattern. Otherwise, it is the type any.
         function getTypeFromBindingElement(element, includePatternInType, reportErrors) {
             if (element.initializer) {
                 return checkDeclarationInitializer(element);
@@ -25251,41 +33335,45 @@ var ts;
             }
             return anyType;
         }
+        // Return the type implied by an object binding pattern
         function getTypeFromObjectBindingPattern(pattern, includePatternInType, reportErrors) {
             var members = ts.createSymbolTable();
             var stringIndexInfo;
-            var objectFlags = 128;
+            var objectFlags = 128 /* ObjectLiteral */;
             ts.forEach(pattern.elements, function (e) {
                 var name = e.propertyName || e.name;
                 if (isComputedNonLiteralName(name)) {
-                    objectFlags |= 512;
+                    // do not include computed properties in the implied type
+                    objectFlags |= 512 /* ObjectLiteralPatternWithComputedProperties */;
                     return;
                 }
                 if (e.dotDotDotToken) {
-                    stringIndexInfo = createIndexInfo(anyType, false);
+                    stringIndexInfo = createIndexInfo(anyType, /*isReadonly*/ false);
                     return;
                 }
                 var text = ts.getTextOfPropertyName(name);
-                var flags = 4 | (e.initializer ? 16777216 : 0);
+                var flags = 4 /* Property */ | (e.initializer ? 16777216 /* Optional */ : 0);
                 var symbol = createSymbol(flags, text);
                 symbol.type = getTypeFromBindingElement(e, includePatternInType, reportErrors);
                 symbol.bindingElement = e;
                 members.set(symbol.escapedName, symbol);
             });
             var result = createAnonymousType(undefined, members, ts.emptyArray, ts.emptyArray, stringIndexInfo, undefined);
-            result.flags |= 268435456;
+            result.flags |= 268435456 /* ContainsObjectLiteral */;
             result.objectFlags |= objectFlags;
             if (includePatternInType) {
                 result.pattern = pattern;
             }
             return result;
         }
+        // Return the type implied by an array binding pattern
         function getTypeFromArrayBindingPattern(pattern, includePatternInType, reportErrors) {
             var elements = pattern.elements;
             var lastElement = ts.lastOrUndefined(elements);
             if (!lastElement || (!ts.isOmittedExpression(lastElement) && lastElement.dotDotDotToken)) {
-                return languageVersion >= 2 ? createIterableType(anyType) : anyArrayType;
+                return languageVersion >= 2 /* ES2015 */ ? createIterableType(anyType) : anyArrayType;
             }
+            // If the pattern has at least one element, and no rest element, then it should imply a tuple type.
             var elementTypes = ts.map(elements, function (e) { return ts.isOmittedExpression(e) ? anyType : getTypeFromBindingElement(e, includePatternInType, reportErrors); });
             var result = createTupleType(elementTypes);
             if (includePatternInType) {
@@ -25294,25 +33382,44 @@ var ts;
             }
             return result;
         }
+        // Return the type implied by a binding pattern. This is the type implied purely by the binding pattern itself
+        // and without regard to its context (i.e. without regard any type annotation or initializer associated with the
+        // declaration in which the binding pattern is contained). For example, the implied type of [x, y] is [any, any]
+        // and the implied type of { x, y: z = 1 } is { x: any; y: number; }. The type implied by a binding pattern is
+        // used as the contextual type of an initializer associated with the binding pattern. Also, for a destructuring
+        // parameter with no type annotation or initializer, the type implied by the binding pattern becomes the type of
+        // the parameter.
         function getTypeFromBindingPattern(pattern, includePatternInType, reportErrors) {
             if (includePatternInType === void 0) { includePatternInType = false; }
             if (reportErrors === void 0) { reportErrors = false; }
-            return pattern.kind === 180
+            return pattern.kind === 180 /* ObjectBindingPattern */
                 ? getTypeFromObjectBindingPattern(pattern, includePatternInType, reportErrors)
                 : getTypeFromArrayBindingPattern(pattern, includePatternInType, reportErrors);
         }
+        // Return the type associated with a variable, parameter, or property declaration. In the simple case this is the type
+        // specified in a type annotation or inferred from an initializer. However, in the case of a destructuring declaration it
+        // is a bit more involved. For example:
+        //
+        //   var [x, s = ""] = [1, "one"];
+        //
+        // Here, the array literal [1, "one"] is contextually typed by the type [any, string], which is the implied type of the
+        // binding pattern [x, s = ""]. Because the contextual type is a tuple type, the resulting type of [1, "one"] is the
+        // tuple type [number, string]. Thus, the type inferred for 'x' is number and the type inferred for 's' is string.
         function getWidenedTypeForVariableLikeDeclaration(declaration, reportErrors) {
-            var type = getTypeForVariableLikeDeclaration(declaration, true);
+            var type = getTypeForVariableLikeDeclaration(declaration, /*includeOptionality*/ true);
             if (type) {
                 if (reportErrors) {
                     reportErrorsFromWidening(declaration, type);
                 }
-                if (type.flags & 2048 && (ts.isBindingElement(declaration) || !declaration.type) && type.symbol !== getSymbolOfNode(declaration)) {
+                // always widen a 'unique symbol' type if the type was created for a different declaration.
+                if (type.flags & 2048 /* UniqueESSymbol */ && (ts.isBindingElement(declaration) || !declaration.type) && type.symbol !== getSymbolOfNode(declaration)) {
                     type = esSymbolType;
                 }
                 return getWidenedType(type);
             }
+            // Rest parameters default to type any[], other parameters default to type any
             type = ts.isParameter(declaration) && declaration.dotDotDotToken ? anyArrayType : anyType;
+            // Report implicit any errors unless this is a private property within an ambient declaration
             if (reportErrors && noImplicitAny) {
                 if (!declarationBelongsToPrivateAmbientMember(declaration)) {
                     reportImplicitAnyError(declaration, type);
@@ -25322,7 +33429,7 @@ var ts;
         }
         function declarationBelongsToPrivateAmbientMember(declaration) {
             var root = ts.getRootDeclaration(declaration);
-            var memberDeclaration = root.kind === 149 ? root.parent : root;
+            var memberDeclaration = root.kind === 149 /* Parameter */ ? root.parent : root;
             return isPrivateWithinAmbient(memberDeclaration);
         }
         function tryGetTypeFromEffectiveTypeNode(declaration) {
@@ -25334,32 +33441,42 @@ var ts;
         function getTypeOfVariableOrParameterOrProperty(symbol) {
             var links = getSymbolLinks(symbol);
             if (!links.type) {
-                if (symbol.flags & 4194304) {
+                // Handle prototype property
+                if (symbol.flags & 4194304 /* Prototype */) {
                     return links.type = getTypeOfPrototypeProperty(symbol);
                 }
+                // CommonsJS require and module both have type any.
                 if (symbol === requireSymbol || symbol === moduleSymbol) {
                     return links.type = anyType;
                 }
+                // Handle catch clause variables
                 var declaration = symbol.valueDeclaration;
                 if (ts.isCatchClauseVariableDeclarationOrBindingElement(declaration)) {
                     return links.type = anyType;
                 }
+                // Handle export default expressions
                 if (ts.isSourceFile(declaration)) {
                     var jsonSourceFile = ts.cast(declaration, ts.isJsonSourceFile);
                     return links.type = jsonSourceFile.statements.length ? checkExpression(jsonSourceFile.statements[0].expression) : emptyObjectType;
                 }
-                if (declaration.kind === 249) {
+                if (declaration.kind === 249 /* ExportAssignment */) {
                     return links.type = checkExpression(declaration.expression);
                 }
                 if (ts.isInJavaScriptFile(declaration) && ts.isJSDocPropertyLikeTag(declaration) && declaration.typeExpression) {
                     return links.type = getTypeFromTypeNode(declaration.typeExpression.type);
                 }
-                if (!pushTypeResolution(symbol, 0)) {
+                // Handle variable, parameter or property
+                if (!pushTypeResolution(symbol, 0 /* Type */)) {
                     return errorType;
                 }
                 var type = void 0;
-                if (declaration.kind === 200 ||
-                    declaration.kind === 185 && declaration.parent.kind === 200) {
+                // Handle certain special assignment kinds, which happen to union across multiple declarations:
+                // * module.exports = expr
+                // * exports.p = expr
+                // * this.p = expr
+                // * className.prototype.method = expr
+                if (declaration.kind === 200 /* BinaryExpression */ ||
+                    declaration.kind === 185 /* PropertyAccessExpression */ && declaration.parent.kind === 200 /* BinaryExpression */) {
                     type = getWidenedTypeFromJSSpecialPropertyDeclarations(symbol);
                 }
                 else if (ts.isJSDocPropertyLikeTag(declaration)
@@ -25369,7 +33486,8 @@ var ts;
                     || ts.isFunctionDeclaration(declaration)
                     || (ts.isMethodDeclaration(declaration) && !ts.isObjectLiteralMethod(declaration))
                     || ts.isMethodSignature(declaration)) {
-                    if (symbol.flags & (16 | 8192 | 32 | 384 | 512)) {
+                    // Symbol is property of some kind that is merged with something - should use `getTypeOfFuncClassEnumModule` and not `getTypeOfVariableOrParameterOrProperty`
+                    if (symbol.flags & (16 /* Function */ | 8192 /* Method */ | 32 /* Class */ | 384 /* Enum */ | 512 /* ValueModule */)) {
                         return getTypeOfFuncClassEnumModule(symbol);
                     }
                     type = tryGetTypeFromEffectiveTypeNode(declaration) || anyType;
@@ -25381,17 +33499,17 @@ var ts;
                     type = tryGetTypeFromEffectiveTypeNode(declaration) || checkJsxAttribute(declaration);
                 }
                 else if (ts.isShorthandPropertyAssignment(declaration)) {
-                    type = tryGetTypeFromEffectiveTypeNode(declaration) || checkExpressionForMutableLocation(declaration.name, 0);
+                    type = tryGetTypeFromEffectiveTypeNode(declaration) || checkExpressionForMutableLocation(declaration.name, 0 /* Normal */);
                 }
                 else if (ts.isObjectLiteralMethod(declaration)) {
-                    type = tryGetTypeFromEffectiveTypeNode(declaration) || checkObjectLiteralMethod(declaration, 0);
+                    type = tryGetTypeFromEffectiveTypeNode(declaration) || checkObjectLiteralMethod(declaration, 0 /* Normal */);
                 }
                 else if (ts.isParameter(declaration)
                     || ts.isPropertyDeclaration(declaration)
                     || ts.isPropertySignature(declaration)
                     || ts.isVariableDeclaration(declaration)
                     || ts.isBindingElement(declaration)) {
-                    type = getWidenedTypeForVariableLikeDeclaration(declaration, true);
+                    type = getWidenedTypeForVariableLikeDeclaration(declaration, /*reportErrors*/ true);
                 }
                 else {
                     return ts.Debug.fail("Unhandled declaration kind! " + ts.Debug.showSyntaxKind(declaration) + " for " + ts.Debug.showSymbol(symbol));
@@ -25405,7 +33523,7 @@ var ts;
         }
         function getAnnotatedAccessorType(accessor) {
             if (accessor) {
-                if (accessor.kind === 156) {
+                if (accessor.kind === 156 /* GetAccessor */) {
                     var getterTypeAnnotation = ts.getEffectiveReturnTypeNode(accessor);
                     return getterTypeAnnotation && getTypeFromTypeNode(getterTypeAnnotation);
                 }
@@ -25426,31 +33544,35 @@ var ts;
         function getTypeOfAccessors(symbol) {
             var links = getSymbolLinks(symbol);
             if (!links.type) {
-                var getter = ts.getDeclarationOfKind(symbol, 156);
-                var setter = ts.getDeclarationOfKind(symbol, 157);
+                var getter = ts.getDeclarationOfKind(symbol, 156 /* GetAccessor */);
+                var setter = ts.getDeclarationOfKind(symbol, 157 /* SetAccessor */);
                 if (getter && ts.isInJavaScriptFile(getter)) {
                     var jsDocType = getTypeForDeclarationFromJSDocComment(getter);
                     if (jsDocType) {
                         return links.type = jsDocType;
                     }
                 }
-                if (!pushTypeResolution(symbol, 0)) {
+                if (!pushTypeResolution(symbol, 0 /* Type */)) {
                     return errorType;
                 }
                 var type = void 0;
+                // First try to see if the user specified a return type on the get-accessor.
                 var getterReturnType = getAnnotatedAccessorType(getter);
                 if (getterReturnType) {
                     type = getterReturnType;
                 }
                 else {
+                    // If the user didn't specify a return type, try to use the set-accessor's parameter type.
                     var setterParameterType = getAnnotatedAccessorType(setter);
                     if (setterParameterType) {
                         type = setterParameterType;
                     }
                     else {
+                        // If there are no specified types, try to infer it from the body of the get accessor if it exists.
                         if (getter && getter.body) {
                             type = getReturnTypeFromBody(getter);
                         }
+                        // Otherwise, fall back to 'any'.
                         else {
                             if (noImplicitAny) {
                                 if (setter) {
@@ -25468,7 +33590,7 @@ var ts;
                 if (!popTypeResolution()) {
                     type = anyType;
                     if (noImplicitAny) {
-                        var getter_1 = ts.getDeclarationOfKind(symbol, 156);
+                        var getter_1 = ts.getDeclarationOfKind(symbol, 156 /* GetAccessor */);
                         error(getter_1, ts.Diagnostics._0_implicitly_has_return_type_any_because_it_does_not_have_a_return_type_annotation_and_is_referenced_directly_or_indirectly_in_one_of_its_return_expressions, symbolToString(symbol));
                     }
                 }
@@ -25478,7 +33600,7 @@ var ts;
         }
         function getBaseTypeVariableOfClass(symbol) {
             var baseConstructorType = getBaseConstructorTypeOfClass(getDeclaredTypeOfClassOrInterface(symbol));
-            return baseConstructorType.flags & 2162688 ? baseConstructorType : undefined;
+            return baseConstructorType.flags & 2162688 /* TypeVariable */ ? baseConstructorType : undefined;
         }
         function getTypeOfFuncClassEnumModule(symbol) {
             var links = getSymbolLinks(symbol);
@@ -25488,6 +33610,7 @@ var ts;
                     var jsSymbol = getSymbolOfNode(jsDeclaration);
                     if (jsSymbol && (ts.hasEntries(jsSymbol.exports) || ts.hasEntries(jsSymbol.members))) {
                         symbol = cloneSymbol(symbol);
+                        // note:we overwrite links because we just cloned the symbol
                         links = symbol;
                         if (ts.hasEntries(jsSymbol.exports)) {
                             symbol.exports = symbol.exports || ts.createSymbolTable();
@@ -25499,21 +33622,21 @@ var ts;
                         }
                     }
                 }
-                if (symbol.flags & 1536 && ts.isShorthandAmbientModuleSymbol(symbol)) {
+                if (symbol.flags & 1536 /* Module */ && ts.isShorthandAmbientModuleSymbol(symbol)) {
                     links.type = anyType;
                 }
-                else if (symbol.valueDeclaration.kind === 200 ||
-                    symbol.valueDeclaration.kind === 185 && symbol.valueDeclaration.parent.kind === 200) {
+                else if (symbol.valueDeclaration.kind === 200 /* BinaryExpression */ ||
+                    symbol.valueDeclaration.kind === 185 /* PropertyAccessExpression */ && symbol.valueDeclaration.parent.kind === 200 /* BinaryExpression */) {
                     links.type = getWidenedTypeFromJSSpecialPropertyDeclarations(symbol);
                 }
                 else {
-                    var type = createObjectType(16, symbol);
-                    if (symbol.flags & 32) {
+                    var type = createObjectType(16 /* Anonymous */, symbol);
+                    if (symbol.flags & 32 /* Class */) {
                         var baseTypeVariable = getBaseTypeVariableOfClass(symbol);
                         links.type = baseTypeVariable ? getIntersectionType([type, baseTypeVariable]) : type;
                     }
                     else {
-                        links.type = strictNullChecks && symbol.flags & 16777216 ? getOptionalType(type) : type;
+                        links.type = strictNullChecks && symbol.flags & 16777216 /* Optional */ ? getOptionalType(type) : type;
                     }
                 }
             }
@@ -25530,7 +33653,12 @@ var ts;
             var links = getSymbolLinks(symbol);
             if (!links.type) {
                 var targetSymbol = resolveAlias(symbol);
-                links.type = targetSymbol.flags & 67216319
+                // It only makes sense to get the type of a value symbol. If the result of resolving
+                // the alias is not a value, then it has no type. To get the type associated with a
+                // type symbol, call getDeclaredTypeOfSymbol.
+                // This check is important because without it, a call to getTypeOfSymbol could end
+                // up recursively calling getTypeOfAlias, causing a stack overflow.
+                links.type = targetSymbol.flags & 67216319 /* Value */
                     ? getTypeOfSymbol(targetSymbol)
                     : errorType;
             }
@@ -25544,7 +33672,7 @@ var ts;
                     links.type = errorType;
                 }
                 else {
-                    if (!pushTypeResolution(symbol, 0)) {
+                    if (!pushTypeResolution(symbol, 0 /* Type */)) {
                         return errorType;
                     }
                     symbolInstantiationDepth++;
@@ -25559,35 +33687,37 @@ var ts;
             return links.type;
         }
         function reportCircularityError(symbol) {
+            // Check if variable has type annotation that circularly references the variable itself
             if (ts.getEffectiveTypeAnnotationNode(symbol.valueDeclaration)) {
                 error(symbol.valueDeclaration, ts.Diagnostics._0_is_referenced_directly_or_indirectly_in_its_own_type_annotation, symbolToString(symbol));
                 return errorType;
             }
+            // Otherwise variable has initializer that circularly references the variable itself
             if (noImplicitAny) {
                 error(symbol.valueDeclaration, ts.Diagnostics._0_implicitly_has_type_any_because_it_does_not_have_a_type_annotation_and_is_referenced_directly_or_indirectly_in_its_own_initializer, symbolToString(symbol));
             }
             return anyType;
         }
         function getTypeOfSymbol(symbol) {
-            if (ts.getCheckFlags(symbol) & 1) {
+            if (ts.getCheckFlags(symbol) & 1 /* Instantiated */) {
                 return getTypeOfInstantiatedSymbol(symbol);
             }
-            if (ts.getCheckFlags(symbol) & 2048) {
+            if (ts.getCheckFlags(symbol) & 2048 /* ReverseMapped */) {
                 return getTypeOfReverseMappedSymbol(symbol);
             }
-            if (symbol.flags & (3 | 4)) {
+            if (symbol.flags & (3 /* Variable */ | 4 /* Property */)) {
                 return getTypeOfVariableOrParameterOrProperty(symbol);
             }
-            if (symbol.flags & (16 | 8192 | 32 | 384 | 512)) {
+            if (symbol.flags & (16 /* Function */ | 8192 /* Method */ | 32 /* Class */ | 384 /* Enum */ | 512 /* ValueModule */)) {
                 return getTypeOfFuncClassEnumModule(symbol);
             }
-            if (symbol.flags & 8) {
+            if (symbol.flags & 8 /* EnumMember */) {
                 return getTypeOfEnumMember(symbol);
             }
-            if (symbol.flags & 98304) {
+            if (symbol.flags & 98304 /* Accessor */) {
                 return getTypeOfAccessors(symbol);
             }
-            if (symbol.flags & 2097152) {
+            if (symbol.flags & 2097152 /* Alias */) {
                 return getTypeOfAlias(symbol);
             }
             return errorType;
@@ -25595,84 +33725,92 @@ var ts;
         function isReferenceToType(type, target) {
             return type !== undefined
                 && target !== undefined
-                && (ts.getObjectFlags(type) & 4) !== 0
+                && (ts.getObjectFlags(type) & 4 /* Reference */) !== 0
                 && type.target === target;
         }
         function getTargetType(type) {
-            return ts.getObjectFlags(type) & 4 ? type.target : type;
+            return ts.getObjectFlags(type) & 4 /* Reference */ ? type.target : type;
         }
+        // TODO: GH#18217 If `checkBase` is undefined, we should not call this because this will always return false.
         function hasBaseType(type, checkBase) {
             return check(type);
             function check(type) {
-                if (ts.getObjectFlags(type) & (3 | 4)) {
+                if (ts.getObjectFlags(type) & (3 /* ClassOrInterface */ | 4 /* Reference */)) {
                     var target = getTargetType(type);
                     return target === checkBase || ts.some(getBaseTypes(target), check);
                 }
-                else if (type.flags & 524288) {
+                else if (type.flags & 524288 /* Intersection */) {
                     return ts.some(type.types, check);
                 }
                 return false;
             }
         }
+        // Appends the type parameters given by a list of declarations to a set of type parameters and returns the resulting set.
+        // The function allocates a new array if the input type parameter set is undefined, but otherwise it modifies the set
+        // in-place and returns the same array.
         function appendTypeParameters(typeParameters, declarations) {
-            for (var _i = 0, declarations_2 = declarations; _i < declarations_2.length; _i++) {
-                var declaration = declarations_2[_i];
+            for (var _i = 0, declarations_1 = declarations; _i < declarations_1.length; _i++) {
+                var declaration = declarations_1[_i];
                 typeParameters = ts.appendIfUnique(typeParameters, getDeclaredTypeOfTypeParameter(getSymbolOfNode(declaration)));
             }
             return typeParameters;
         }
+        // Return the outer type parameters of a node or undefined if the node has no outer type parameters.
         function getOuterTypeParameters(node, includeThisTypes) {
             while (true) {
-                node = node.parent;
+                node = node.parent; // TODO: GH#18217 Use SourceFile kind check instead
                 if (!node) {
                     return undefined;
                 }
                 switch (node.kind) {
-                    case 235:
-                    case 205:
-                    case 236:
-                    case 158:
-                    case 159:
-                    case 153:
-                    case 163:
-                    case 164:
-                    case 284:
-                    case 234:
-                    case 154:
-                    case 192:
-                    case 193:
-                    case 237:
-                    case 296:
-                    case 297:
-                    case 292:
-                    case 177:
-                    case 171:
+                    case 235 /* ClassDeclaration */:
+                    case 205 /* ClassExpression */:
+                    case 236 /* InterfaceDeclaration */:
+                    case 158 /* CallSignature */:
+                    case 159 /* ConstructSignature */:
+                    case 153 /* MethodSignature */:
+                    case 163 /* FunctionType */:
+                    case 164 /* ConstructorType */:
+                    case 284 /* JSDocFunctionType */:
+                    case 234 /* FunctionDeclaration */:
+                    case 154 /* MethodDeclaration */:
+                    case 192 /* FunctionExpression */:
+                    case 193 /* ArrowFunction */:
+                    case 237 /* TypeAliasDeclaration */:
+                    case 296 /* JSDocTemplateTag */:
+                    case 297 /* JSDocTypedefTag */:
+                    case 292 /* JSDocCallbackTag */:
+                    case 177 /* MappedType */:
+                    case 171 /* ConditionalType */:
                         var outerTypeParameters = getOuterTypeParameters(node, includeThisTypes);
-                        if (node.kind === 177) {
+                        if (node.kind === 177 /* MappedType */) {
                             return ts.append(outerTypeParameters, getDeclaredTypeOfTypeParameter(getSymbolOfNode(node.typeParameter)));
                         }
-                        else if (node.kind === 171) {
+                        else if (node.kind === 171 /* ConditionalType */) {
                             return ts.concatenate(outerTypeParameters, getInferTypeParameters(node));
                         }
                         var outerAndOwnTypeParameters = appendTypeParameters(outerTypeParameters, ts.getEffectiveTypeParameterDeclarations(node));
                         var thisType = includeThisTypes &&
-                            (node.kind === 235 || node.kind === 205 || node.kind === 236) &&
+                            (node.kind === 235 /* ClassDeclaration */ || node.kind === 205 /* ClassExpression */ || node.kind === 236 /* InterfaceDeclaration */) &&
                             getDeclaredTypeOfClassOrInterface(getSymbolOfNode(node)).thisType;
                         return thisType ? ts.append(outerAndOwnTypeParameters, thisType) : outerAndOwnTypeParameters;
                 }
             }
         }
+        // The outer type parameters are those defined by enclosing generic classes, methods, or functions.
         function getOuterTypeParametersOfClassOrInterface(symbol) {
-            var declaration = symbol.flags & 32 ? symbol.valueDeclaration : ts.getDeclarationOfKind(symbol, 236);
+            var declaration = symbol.flags & 32 /* Class */ ? symbol.valueDeclaration : ts.getDeclarationOfKind(symbol, 236 /* InterfaceDeclaration */);
             return getOuterTypeParameters(declaration);
         }
+        // The local type parameters are the combined set of type parameters from all declarations of the class,
+        // interface, or type alias.
         function getLocalTypeParametersOfClassOrInterfaceOrTypeAlias(symbol) {
             var result;
             for (var _i = 0, _a = symbol.declarations; _i < _a.length; _i++) {
                 var node = _a[_i];
-                if (node.kind === 236 ||
-                    node.kind === 235 ||
-                    node.kind === 205 ||
+                if (node.kind === 236 /* InterfaceDeclaration */ ||
+                    node.kind === 235 /* ClassDeclaration */ ||
+                    node.kind === 205 /* ClassExpression */ ||
                     ts.isTypeAlias(node)) {
                     var declaration = node;
                     result = appendTypeParameters(result, ts.getEffectiveTypeParameterDeclarations(declaration));
@@ -25680,11 +33818,15 @@ var ts;
             }
             return result;
         }
+        // The full set of type parameters for a generic class or interface type consists of its outer type parameters plus
+        // its locally declared type parameters.
         function getTypeParametersOfClassOrInterface(symbol) {
             return ts.concatenate(getOuterTypeParametersOfClassOrInterface(symbol), getLocalTypeParametersOfClassOrInterfaceOrTypeAlias(symbol));
         }
+        // A type is a mixin constructor if it has a single construct signature taking no type parameters and a single
+        // rest parameter of type any[].
         function isMixinConstructorType(type) {
-            var signatures = getSignaturesOfType(type, 1);
+            var signatures = getSignaturesOfType(type, 1 /* Construct */);
             if (signatures.length === 1) {
                 var s = signatures[0];
                 return !s.typeParameters && s.parameters.length === 1 && s.hasRestParameter && getTypeOfParameter(s.parameters[0]) === anyArrayType;
@@ -25692,10 +33834,10 @@ var ts;
             return false;
         }
         function isConstructorType(type) {
-            if (isValidBaseType(type) && getSignaturesOfType(type, 1).length > 0) {
+            if (isValidBaseType(type) && getSignaturesOfType(type, 1 /* Construct */).length > 0) {
                 return true;
             }
-            if (type.flags & 2162688) {
+            if (type.flags & 2162688 /* TypeVariable */) {
                 var constraint = getBaseConstraintOfType(type);
                 return !!constraint && isValidBaseType(constraint) && isMixinConstructorType(constraint);
             }
@@ -25704,6 +33846,7 @@ var ts;
         function getBaseTypeNodeOfClass(type) {
             var decl = type.symbol.valueDeclaration;
             if (ts.isInJavaScriptFile(decl)) {
+                // Prefer an @augments tag because it may have type parameters.
                 var tag = ts.getJSDocAugmentsTag(decl);
                 if (tag) {
                     return tag.class;
@@ -25714,13 +33857,21 @@ var ts;
         function getConstructorsForTypeArguments(type, typeArgumentNodes, location) {
             var typeArgCount = ts.length(typeArgumentNodes);
             var isJavaScript = ts.isInJavaScriptFile(location);
-            return ts.filter(getSignaturesOfType(type, 1), function (sig) { return (isJavaScript || typeArgCount >= getMinTypeArgumentCount(sig.typeParameters)) && typeArgCount <= ts.length(sig.typeParameters); });
+            return ts.filter(getSignaturesOfType(type, 1 /* Construct */), function (sig) { return (isJavaScript || typeArgCount >= getMinTypeArgumentCount(sig.typeParameters)) && typeArgCount <= ts.length(sig.typeParameters); });
         }
         function getInstantiatedConstructorsForTypeArguments(type, typeArgumentNodes, location) {
             var signatures = getConstructorsForTypeArguments(type, typeArgumentNodes, location);
             var typeArguments = ts.map(typeArgumentNodes, getTypeFromTypeNode);
             return ts.sameMap(signatures, function (sig) { return ts.some(sig.typeParameters) ? getSignatureInstantiation(sig, typeArguments, ts.isInJavaScriptFile(location)) : sig; });
         }
+        /**
+         * The base constructor of a class can resolve to
+         * * undefinedType if the class has no extends clause,
+         * * unknownType if an error occurred during resolution of the extends expression,
+         * * nullType if the extends expression is the null value,
+         * * anyType if the extends expression has type any, or
+         * * an object type with at least one construct signature.
+         */
         function getBaseConstructorTypeOfClass(type) {
             if (!type.resolvedBaseConstructorType) {
                 var decl = type.symbol.valueDeclaration;
@@ -25729,22 +33880,24 @@ var ts;
                 if (!baseTypeNode) {
                     return type.resolvedBaseConstructorType = undefinedType;
                 }
-                if (!pushTypeResolution(type, 1)) {
+                if (!pushTypeResolution(type, 1 /* ResolvedBaseConstructorType */)) {
                     return errorType;
                 }
                 var baseConstructorType = checkExpression(baseTypeNode.expression);
                 if (extended && baseTypeNode !== extended) {
-                    ts.Debug.assert(!extended.typeArguments);
+                    ts.Debug.assert(!extended.typeArguments); // Because this is in a JS file, and baseTypeNode is in an @extends tag
                     checkExpression(extended.expression);
                 }
-                if (baseConstructorType.flags & (131072 | 524288)) {
+                if (baseConstructorType.flags & (131072 /* Object */ | 524288 /* Intersection */)) {
+                    // Resolving the members of a class requires us to resolve the base class of that class.
+                    // We force resolution here such that we catch circularities now.
                     resolveStructuredTypeMembers(baseConstructorType);
                 }
                 if (!popTypeResolution()) {
                     error(type.symbol.valueDeclaration, ts.Diagnostics._0_is_referenced_directly_or_indirectly_in_its_own_base_expression, symbolToString(type.symbol));
                     return type.resolvedBaseConstructorType = errorType;
                 }
-                if (!(baseConstructorType.flags & 1) && baseConstructorType !== nullWideningType && !isConstructorType(baseConstructorType)) {
+                if (!(baseConstructorType.flags & 1 /* Any */) && baseConstructorType !== nullWideningType && !isConstructorType(baseConstructorType)) {
                     error(baseTypeNode.expression, ts.Diagnostics.Type_0_is_not_a_constructor_function_type, typeToString(baseConstructorType));
                     return type.resolvedBaseConstructorType = errorType;
                 }
@@ -25754,14 +33907,14 @@ var ts;
         }
         function getBaseTypes(type) {
             if (!type.resolvedBaseTypes) {
-                if (type.objectFlags & 8) {
+                if (type.objectFlags & 8 /* Tuple */) {
                     type.resolvedBaseTypes = [createArrayType(getUnionType(type.typeParameters))];
                 }
-                else if (type.symbol.flags & (32 | 64)) {
-                    if (type.symbol.flags & 32) {
+                else if (type.symbol.flags & (32 /* Class */ | 64 /* Interface */)) {
+                    if (type.symbol.flags & 32 /* Class */) {
                         resolveBaseTypesOfClass(type);
                     }
-                    if (type.symbol.flags & 64) {
+                    if (type.symbol.flags & 64 /* Interface */) {
                         resolveBaseTypesOfInterface(type);
                     }
                 }
@@ -25774,21 +33927,27 @@ var ts;
         function resolveBaseTypesOfClass(type) {
             type.resolvedBaseTypes = ts.resolvingEmptyArray;
             var baseConstructorType = getApparentType(getBaseConstructorTypeOfClass(type));
-            if (!(baseConstructorType.flags & (131072 | 524288 | 1))) {
+            if (!(baseConstructorType.flags & (131072 /* Object */ | 524288 /* Intersection */ | 1 /* Any */))) {
                 return type.resolvedBaseTypes = ts.emptyArray;
             }
             var baseTypeNode = getBaseTypeNodeOfClass(type);
             var typeArgs = typeArgumentsFromTypeReferenceNode(baseTypeNode);
             var baseType;
             var originalBaseType = baseConstructorType && baseConstructorType.symbol ? getDeclaredTypeOfSymbol(baseConstructorType.symbol) : undefined;
-            if (baseConstructorType.symbol && baseConstructorType.symbol.flags & 32 &&
+            if (baseConstructorType.symbol && baseConstructorType.symbol.flags & 32 /* Class */ &&
                 areAllOuterTypeParametersApplied(originalBaseType)) {
+                // When base constructor type is a class with no captured type arguments we know that the constructors all have the same type parameters as the
+                // class and all return the instance type of the class. There is no need for further checks and we can apply the
+                // type arguments in the same manner as a type reference to get the same error reporting experience.
                 baseType = getTypeFromClassOrInterfaceReference(baseTypeNode, baseConstructorType.symbol, typeArgs);
             }
-            else if (baseConstructorType.flags & 1) {
+            else if (baseConstructorType.flags & 1 /* Any */) {
                 baseType = baseConstructorType;
             }
             else {
+                // The class derives from a "class-like" constructor function, check that we have at least one construct signature
+                // with a matching number of type parameters and use the return type of the first instantiated signature. Elsewhere
+                // we check that all instantiated signatures return the same type.
                 var constructors = getInstantiatedConstructorsForTypeArguments(baseConstructorType, baseTypeNode.typeArguments, baseTypeNode);
                 if (!constructors.length) {
                     error(baseTypeNode.expression, ts.Diagnostics.No_base_constructor_has_the_specified_number_of_type_arguments);
@@ -25804,15 +33963,21 @@ var ts;
                 return type.resolvedBaseTypes = ts.emptyArray;
             }
             if (type === baseType || hasBaseType(baseType, type)) {
-                error(type.symbol.valueDeclaration, ts.Diagnostics.Type_0_recursively_references_itself_as_a_base_type, typeToString(type, undefined, 2));
+                error(type.symbol.valueDeclaration, ts.Diagnostics.Type_0_recursively_references_itself_as_a_base_type, typeToString(type, /*enclosingDeclaration*/ undefined, 2 /* WriteArrayAsGenericType */));
                 return type.resolvedBaseTypes = ts.emptyArray;
             }
             if (type.resolvedBaseTypes === ts.resolvingEmptyArray) {
-                type.members = undefined;
+                // Circular reference, likely through instantiation of default parameters
+                // (otherwise there'd be an error from hasBaseType) - this is fine, but `.members` should be reset
+                // as `getIndexedAccessType` via `instantiateType` via `getTypeFromClassOrInterfaceReference` forces a
+                // partial instantiation of the members without the base types fully resolved
+                type.members = undefined; // TODO: GH#18217
             }
             return type.resolvedBaseTypes = [baseType];
         }
         function areAllOuterTypeParametersApplied(type) {
+            // An unapplied type parameter has its symbol still the same as the matching argument symbol.
+            // Since parameters are applied outer-to-inner, only the last outer parameter needs to be checked.
             var outerTypeParameters = type.outerTypeParameters;
             if (outerTypeParameters) {
                 var last_1 = outerTypeParameters.length - 1;
@@ -25821,15 +33986,17 @@ var ts;
             }
             return true;
         }
+        // A valid base type is `any`, any non-generic object type or intersection of non-generic
+        // object types.
         function isValidBaseType(type) {
-            return !!(type.flags & (131072 | 16777216 | 1)) && !isGenericMappedType(type) ||
-                !!(type.flags & 524288) && !ts.some(type.types, function (t) { return !isValidBaseType(t); });
+            return !!(type.flags & (131072 /* Object */ | 16777216 /* NonPrimitive */ | 1 /* Any */)) && !isGenericMappedType(type) ||
+                !!(type.flags & 524288 /* Intersection */) && ts.every(type.types, isValidBaseType);
         }
         function resolveBaseTypesOfInterface(type) {
             type.resolvedBaseTypes = type.resolvedBaseTypes || ts.emptyArray;
             for (var _i = 0, _a = type.symbol.declarations; _i < _a.length; _i++) {
                 var declaration = _a[_i];
-                if (declaration.kind === 236 && ts.getInterfaceBaseTypeNodes(declaration)) {
+                if (declaration.kind === 236 /* InterfaceDeclaration */ && ts.getInterfaceBaseTypeNodes(declaration)) {
                     for (var _b = 0, _c = ts.getInterfaceBaseTypeNodes(declaration); _b < _c.length; _b++) {
                         var node = _c[_b];
                         var baseType = getTypeFromTypeNode(node);
@@ -25844,7 +34011,7 @@ var ts;
                                     }
                                 }
                                 else {
-                                    error(declaration, ts.Diagnostics.Type_0_recursively_references_itself_as_a_base_type, typeToString(type, undefined, 2));
+                                    error(declaration, ts.Diagnostics.Type_0_recursively_references_itself_as_a_base_type, typeToString(type, /*enclosingDeclaration*/ undefined, 2 /* WriteArrayAsGenericType */));
                                 }
                             }
                             else {
@@ -25855,11 +34022,18 @@ var ts;
                 }
             }
         }
+        /**
+         * Returns true if the interface given by the symbol is free of "this" references.
+         *
+         * Specifically, the result is true if the interface itself contains no references
+         * to "this" in its body, if all base types are interfaces,
+         * and if none of the base interfaces have a "this" type.
+         */
         function isThislessInterface(symbol) {
             for (var _i = 0, _a = symbol.declarations; _i < _a.length; _i++) {
                 var declaration = _a[_i];
-                if (declaration.kind === 236) {
-                    if (declaration.flags & 64) {
+                if (declaration.kind === 236 /* InterfaceDeclaration */) {
+                    if (declaration.flags & 64 /* ContainsThis */) {
                         return false;
                     }
                     var baseTypeNodes = ts.getInterfaceBaseTypeNodes(declaration);
@@ -25867,8 +34041,8 @@ var ts;
                         for (var _b = 0, baseTypeNodes_1 = baseTypeNodes; _b < baseTypeNodes_1.length; _b++) {
                             var node = baseTypeNodes_1[_b];
                             if (ts.isEntityNameExpression(node.expression)) {
-                                var baseSymbol = resolveEntityName(node.expression, 67901928, true);
-                                if (!baseSymbol || !(baseSymbol.flags & 64) || getDeclaredTypeOfClassOrInterface(baseSymbol).thisType) {
+                                var baseSymbol = resolveEntityName(node.expression, 67901928 /* Type */, /*ignoreErrors*/ true);
+                                if (!baseSymbol || !(baseSymbol.flags & 64 /* Interface */) || getDeclaredTypeOfClassOrInterface(baseSymbol).thisType) {
                                     return false;
                                 }
                             }
@@ -25881,12 +34055,17 @@ var ts;
         function getDeclaredTypeOfClassOrInterface(symbol) {
             var links = getSymbolLinks(symbol);
             if (!links.declaredType) {
-                var kind = symbol.flags & 32 ? 1 : 2;
+                var kind = symbol.flags & 32 /* Class */ ? 1 /* Class */ : 2 /* Interface */;
                 var type = links.declaredType = createObjectType(kind, symbol);
                 var outerTypeParameters = getOuterTypeParametersOfClassOrInterface(symbol);
                 var localTypeParameters = getLocalTypeParametersOfClassOrInterfaceOrTypeAlias(symbol);
-                if (outerTypeParameters || localTypeParameters || kind === 1 || !isThislessInterface(symbol)) {
-                    type.objectFlags |= 4;
+                // A class or interface is generic if it has type parameters or a "this" type. We always give classes a "this" type
+                // because it is not feasible to analyze all members to determine if the "this" type escapes the class (in particular,
+                // property types inferred from initializers and method return types inferred from return statements are very hard
+                // to exhaustively analyze). We give interfaces a "this" type if we can't definitely determine that they are free of
+                // "this" references.
+                if (outerTypeParameters || localTypeParameters || kind === 1 /* Class */ || !isThislessInterface(symbol)) {
+                    type.objectFlags |= 4 /* Reference */;
                     type.typeParameters = ts.concatenate(outerTypeParameters, localTypeParameters);
                     type.outerTypeParameters = outerTypeParameters;
                     type.localTypeParameters = localTypeParameters;
@@ -25894,7 +34073,7 @@ var ts;
                     type.instantiations.set(getTypeListId(type.typeParameters), type);
                     type.target = type;
                     type.typeArguments = type.typeParameters;
-                    type.thisType = createType(65536);
+                    type.thisType = createType(65536 /* TypeParameter */);
                     type.thisType.isThisType = true;
                     type.thisType.symbol = symbol;
                     type.thisType.constraint = type;
@@ -25905,17 +34084,22 @@ var ts;
         function getDeclaredTypeOfTypeAlias(symbol) {
             var links = getSymbolLinks(symbol);
             if (!links.declaredType) {
-                if (!pushTypeResolution(symbol, 2)) {
+                // Note that we use the links object as the target here because the symbol object is used as the unique
+                // identity for resolution of the 'type' property in SymbolLinks.
+                if (!pushTypeResolution(symbol, 2 /* DeclaredType */)) {
                     return errorType;
                 }
                 var declaration = ts.find(symbol.declarations, function (d) {
-                    return ts.isJSDocTypeAlias(d) || d.kind === 237;
+                    return ts.isJSDocTypeAlias(d) || d.kind === 237 /* TypeAliasDeclaration */;
                 });
                 var typeNode = ts.isJSDocTypeAlias(declaration) ? declaration.typeExpression : declaration.type;
+                // If typeNode is missing, we will error in checkJSDocTypedefTag.
                 var type = typeNode ? getTypeFromTypeNode(typeNode) : errorType;
                 if (popTypeResolution()) {
                     var typeParameters = getLocalTypeParametersOfClassOrInterfaceOrTypeAlias(symbol);
                     if (typeParameters) {
+                        // Initialize the instantiation cache for generic type aliases. The declared type corresponds to
+                        // an instantiation of the type alias with the type parameters supplied as type arguments.
                         links.typeParameters = typeParameters;
                         links.instantiations = ts.createMap();
                         links.instantiations.set(getTypeListId(typeParameters), type);
@@ -25930,10 +34114,10 @@ var ts;
             return links.declaredType;
         }
         function isStringConcatExpression(expr) {
-            if (expr.kind === 9) {
+            if (expr.kind === 9 /* StringLiteral */) {
                 return true;
             }
-            else if (expr.kind === 200) {
+            else if (expr.kind === 200 /* BinaryExpression */) {
                 return isStringConcatExpression(expr.left) && isStringConcatExpression(expr.right);
             }
             return false;
@@ -25941,18 +34125,18 @@ var ts;
         function isLiteralEnumMember(member) {
             var expr = member.initializer;
             if (!expr) {
-                return !(member.flags & 4194304);
+                return !(member.flags & 4194304 /* Ambient */);
             }
             switch (expr.kind) {
-                case 9:
-                case 8:
+                case 9 /* StringLiteral */:
+                case 8 /* NumericLiteral */:
                     return true;
-                case 198:
-                    return expr.operator === 38 &&
-                        expr.operand.kind === 8;
-                case 71:
+                case 198 /* PrefixUnaryExpression */:
+                    return expr.operator === 38 /* MinusToken */ &&
+                        expr.operand.kind === 8 /* NumericLiteral */;
+                case 71 /* Identifier */:
                     return ts.nodeIsMissing(expr) || !!getSymbolOfNode(member.parent).exports.get(expr.escapedText);
-                case 200:
+                case 200 /* BinaryExpression */:
                     return isStringConcatExpression(expr);
                 default:
                     return false;
@@ -25966,11 +34150,11 @@ var ts;
             var hasNonLiteralMember = false;
             for (var _i = 0, _a = symbol.declarations; _i < _a.length; _i++) {
                 var declaration = _a[_i];
-                if (declaration.kind === 238) {
+                if (declaration.kind === 238 /* EnumDeclaration */) {
                     for (var _b = 0, _c = declaration.members; _b < _c.length; _b++) {
                         var member = _c[_b];
-                        if (member.initializer && member.initializer.kind === 9) {
-                            return links.enumKind = 1;
+                        if (member.initializer && member.initializer.kind === 9 /* StringLiteral */) {
+                            return links.enumKind = 1 /* Literal */;
                         }
                         if (!isLiteralEnumMember(member)) {
                             hasNonLiteralMember = true;
@@ -25978,40 +34162,40 @@ var ts;
                     }
                 }
             }
-            return links.enumKind = hasNonLiteralMember ? 0 : 1;
+            return links.enumKind = hasNonLiteralMember ? 0 /* Numeric */ : 1 /* Literal */;
         }
         function getBaseTypeOfEnumLiteralType(type) {
-            return type.flags & 512 && !(type.flags & 262144) ? getDeclaredTypeOfSymbol(getParentOfSymbol(type.symbol)) : type;
+            return type.flags & 512 /* EnumLiteral */ && !(type.flags & 262144 /* Union */) ? getDeclaredTypeOfSymbol(getParentOfSymbol(type.symbol)) : type;
         }
         function getDeclaredTypeOfEnum(symbol) {
             var links = getSymbolLinks(symbol);
             if (links.declaredType) {
                 return links.declaredType;
             }
-            if (getEnumKind(symbol) === 1) {
+            if (getEnumKind(symbol) === 1 /* Literal */) {
                 enumCount++;
                 var memberTypeList = [];
                 for (var _i = 0, _a = symbol.declarations; _i < _a.length; _i++) {
                     var declaration = _a[_i];
-                    if (declaration.kind === 238) {
+                    if (declaration.kind === 238 /* EnumDeclaration */) {
                         for (var _b = 0, _c = declaration.members; _b < _c.length; _b++) {
                             var member = _c[_b];
-                            var memberType = getLiteralType(getEnumMemberValue(member), enumCount, getSymbolOfNode(member));
+                            var memberType = getLiteralType(getEnumMemberValue(member), enumCount, getSymbolOfNode(member)); // TODO: GH#18217
                             getSymbolLinks(getSymbolOfNode(member)).declaredType = memberType;
                             memberTypeList.push(memberType);
                         }
                     }
                 }
                 if (memberTypeList.length) {
-                    var enumType_1 = getUnionType(memberTypeList, 1, symbol, undefined);
-                    if (enumType_1.flags & 262144) {
-                        enumType_1.flags |= 512;
+                    var enumType_1 = getUnionType(memberTypeList, 1 /* Literal */, symbol, /*aliasTypeArguments*/ undefined);
+                    if (enumType_1.flags & 262144 /* Union */) {
+                        enumType_1.flags |= 512 /* EnumLiteral */;
                         enumType_1.symbol = symbol;
                     }
                     return links.declaredType = enumType_1;
                 }
             }
-            var enumType = createType(32);
+            var enumType = createType(32 /* Enum */);
             enumType.symbol = symbol;
             return links.declaredType = enumType;
         }
@@ -26028,7 +34212,7 @@ var ts;
         function getDeclaredTypeOfTypeParameter(symbol) {
             var links = getSymbolLinks(symbol);
             if (!links.declaredType) {
-                var type = createType(65536);
+                var type = createType(65536 /* TypeParameter */);
                 type.symbol = symbol;
                 links.declaredType = type;
             }
@@ -26045,83 +34229,107 @@ var ts;
             return tryGetDeclaredTypeOfSymbol(symbol) || errorType;
         }
         function tryGetDeclaredTypeOfSymbol(symbol) {
-            if (symbol.flags & (32 | 64)) {
+            if (symbol.flags & (32 /* Class */ | 64 /* Interface */)) {
                 return getDeclaredTypeOfClassOrInterface(symbol);
             }
-            if (symbol.flags & 524288) {
+            if (symbol.flags & 524288 /* TypeAlias */) {
                 return getDeclaredTypeOfTypeAlias(symbol);
             }
-            if (symbol.flags & 262144) {
+            if (symbol.flags & 262144 /* TypeParameter */) {
                 return getDeclaredTypeOfTypeParameter(symbol);
             }
-            if (symbol.flags & 384) {
+            if (symbol.flags & 384 /* Enum */) {
                 return getDeclaredTypeOfEnum(symbol);
             }
-            if (symbol.flags & 8) {
+            if (symbol.flags & 8 /* EnumMember */) {
                 return getDeclaredTypeOfEnumMember(symbol);
             }
-            if (symbol.flags & 2097152) {
+            if (symbol.flags & 2097152 /* Alias */) {
                 return getDeclaredTypeOfAlias(symbol);
             }
             return undefined;
         }
+        /**
+         * A type is free of this references if it's the any, string, number, boolean, symbol, or void keyword, a string
+         * literal type, an array with an element type that is free of this references, or a type reference that is
+         * free of this references.
+         */
         function isThislessType(node) {
             switch (node.kind) {
-                case 119:
-                case 142:
-                case 137:
-                case 134:
-                case 122:
-                case 138:
-                case 135:
-                case 105:
-                case 140:
-                case 95:
-                case 131:
-                case 178:
+                case 119 /* AnyKeyword */:
+                case 142 /* UnknownKeyword */:
+                case 137 /* StringKeyword */:
+                case 134 /* NumberKeyword */:
+                case 122 /* BooleanKeyword */:
+                case 138 /* SymbolKeyword */:
+                case 135 /* ObjectKeyword */:
+                case 105 /* VoidKeyword */:
+                case 140 /* UndefinedKeyword */:
+                case 95 /* NullKeyword */:
+                case 131 /* NeverKeyword */:
+                case 178 /* LiteralType */:
                     return true;
-                case 167:
+                case 167 /* ArrayType */:
                     return isThislessType(node.elementType);
-                case 162:
+                case 162 /* TypeReference */:
                     return !node.typeArguments || node.typeArguments.every(isThislessType);
             }
             return false;
         }
+        /** A type parameter is thisless if its contraint is thisless, or if it has no constraint. */
         function isThislessTypeParameter(node) {
             return !node.constraint || isThislessType(node.constraint);
         }
+        /**
+         * A variable-like declaration is free of this references if it has a type annotation
+         * that is thisless, or if it has no type annotation and no initializer (and is thus of type any).
+         */
         function isThislessVariableLikeDeclaration(node) {
             var typeNode = ts.getEffectiveTypeAnnotationNode(node);
             return typeNode ? isThislessType(typeNode) : !ts.hasInitializer(node);
         }
+        /**
+         * A function-like declaration is considered free of `this` references if it has a return type
+         * annotation that is free of this references and if each parameter is thisless and if
+         * each type parameter (if present) is thisless.
+         */
         function isThislessFunctionLikeDeclaration(node) {
             var returnType = ts.getEffectiveReturnTypeNode(node);
             var typeParameters = ts.getEffectiveTypeParameterDeclarations(node);
-            return (node.kind === 155 || (!!returnType && isThislessType(returnType))) &&
+            return (node.kind === 155 /* Constructor */ || (!!returnType && isThislessType(returnType))) &&
                 node.parameters.every(isThislessVariableLikeDeclaration) &&
                 typeParameters.every(isThislessTypeParameter);
         }
+        /**
+         * Returns true if the class or interface member given by the symbol is free of "this" references. The
+         * function may return false for symbols that are actually free of "this" references because it is not
+         * feasible to perform a complete analysis in all cases. In particular, property members with types
+         * inferred from their initializers and function members with inferred return types are conservatively
+         * assumed not to be free of "this" references.
+         */
         function isThisless(symbol) {
             if (symbol.declarations && symbol.declarations.length === 1) {
                 var declaration = symbol.declarations[0];
                 if (declaration) {
                     switch (declaration.kind) {
-                        case 152:
-                        case 151:
+                        case 152 /* PropertyDeclaration */:
+                        case 151 /* PropertySignature */:
                             return isThislessVariableLikeDeclaration(declaration);
-                        case 154:
-                        case 153:
-                        case 155:
+                        case 154 /* MethodDeclaration */:
+                        case 153 /* MethodSignature */:
+                        case 155 /* Constructor */:
                             return isThislessFunctionLikeDeclaration(declaration);
                     }
                 }
             }
             return false;
         }
+        // The mappingThisOnly flag indicates that the only type parameter being mapped is "this". When the flag is true,
+        // we check symbols to see if we can quickly conclude they are free of "this" references, thus needing no instantiation.
         function createInstantiatedSymbolTable(symbols, mapper, mappingThisOnly) {
             var result = ts.createSymbolTable();
-            for (var _i = 0, symbols_2 = symbols; _i < symbols_2.length; _i++) {
-                var symbol = symbols_2[_i];
+            for (var _i = 0, symbols_1 = symbols; _i < symbols_1.length; _i++) {
+                var symbol = symbols_1[_i];
                 result.set(symbol.escapedName, mappingThisOnly && isThisless(symbol) ? symbol : instantiateSymbol(symbol, mapper));
             }
             return result;
@@ -26139,44 +34347,73 @@ var ts;
                 var symbol = type.symbol;
                 var members = getMembersOfSymbol(symbol);
                 type.declaredProperties = getNamedMembers(members);
+                // Start with signatures at empty array in case of recursive types
                 type.declaredCallSignatures = ts.emptyArray;
                 type.declaredConstructSignatures = ts.emptyArray;
-                type.declaredCallSignatures = getSignaturesOfSymbol(members.get("__call"));
-                type.declaredConstructSignatures = getSignaturesOfSymbol(members.get("__new"));
-                type.declaredStringIndexInfo = getIndexInfoOfSymbol(symbol, 0);
-                type.declaredNumberIndexInfo = getIndexInfoOfSymbol(symbol, 1);
+                type.declaredCallSignatures = getSignaturesOfSymbol(members.get("__call" /* Call */));
+                type.declaredConstructSignatures = getSignaturesOfSymbol(members.get("__new" /* New */));
+                type.declaredStringIndexInfo = getIndexInfoOfSymbol(symbol, 0 /* String */);
+                type.declaredNumberIndexInfo = getIndexInfoOfSymbol(symbol, 1 /* Number */);
             }
             return type;
         }
+        /**
+         * Indicates whether a type can be used as a late-bound name.
+         */
         function isTypeUsableAsLateBoundName(type) {
-            return !!(type.flags & 2240);
+            return !!(type.flags & 2240 /* StringOrNumberLiteralOrUnique */);
         }
+        /**
+         * Indicates whether a declaration name is definitely late-bindable.
+         * A declaration name is only late-bindable if:
+         * - It is a `ComputedPropertyName`.
+         * - Its expression is an `Identifier` or either a `PropertyAccessExpression` an
+         * `ElementAccessExpression` consisting only of these same three types of nodes.
+         * - The type of its expression is a string or numeric literal type, or is a `unique symbol` type.
+         */
         function isLateBindableName(node) {
             return ts.isComputedPropertyName(node)
                 && ts.isEntityNameExpression(node.expression)
                 && isTypeUsableAsLateBoundName(checkComputedPropertyName(node));
         }
+        /**
+         * Indicates whether a declaration has a late-bindable dynamic name.
+         */
         function hasLateBindableName(node) {
             var name = ts.getNameOfDeclaration(node);
             return !!name && isLateBindableName(name);
         }
+        /**
+         * Indicates whether a declaration has a dynamic name that cannot be late-bound.
+         */
         function hasNonBindableDynamicName(node) {
             return ts.hasDynamicName(node) && !hasLateBindableName(node);
         }
+        /**
+         * Indicates whether a declaration name is a dynamic name that cannot be late-bound.
+         */
         function isNonBindableDynamicName(node) {
             return ts.isDynamicName(node) && !isLateBindableName(node);
         }
+        /**
+         * Gets the symbolic name for a late-bound member from its type.
+         */
         function getLateBoundNameFromType(type) {
-            if (type.flags & 2048) {
+            if (type.flags & 2048 /* UniqueESSymbol */) {
                 return "__@" + type.symbol.escapedName + "@" + getSymbolId(type.symbol);
             }
-            if (type.flags & 192) {
+            if (type.flags & 192 /* StringOrNumberLiteral */) {
                 return ts.escapeLeadingUnderscores("" + type.value);
             }
             return ts.Debug.fail();
         }
+        /**
+         * Adds a declaration to a late-bound dynamic member. This performs the same function for
+         * late-bound members that `addDeclarationToSymbol` in binder.ts performs for early-bound
+         * members.
+         */
         function addDeclarationToLateBoundSymbol(symbol, member, symbolFlags) {
-            ts.Debug.assert(!!(ts.getCheckFlags(symbol) & 1024), "Expected a late-bound symbol.");
+            ts.Debug.assert(!!(ts.getCheckFlags(symbol) & 1024 /* Late */), "Expected a late-bound symbol.");
             symbol.flags |= symbolFlags;
             getSymbolLinks(member.symbol).lateSymbol = symbol;
             if (!symbol.declarations) {
@@ -26185,31 +34422,67 @@ var ts;
             else {
                 symbol.declarations.push(member);
             }
-            if (symbolFlags & 67216319) {
+            if (symbolFlags & 67216319 /* Value */) {
                 if (!symbol.valueDeclaration || symbol.valueDeclaration.kind !== member.kind) {
                     symbol.valueDeclaration = member;
                 }
             }
         }
+        /**
+         * Performs late-binding of a dynamic member. This performs the same function for
+         * late-bound members that `declareSymbol` in binder.ts performs for early-bound
+         * members.
+         *
+         * If a symbol is a dynamic name from a computed property, we perform an additional "late"
+         * binding phase to attempt to resolve the name for the symbol from the type of the computed
+         * property's expression. If the type of the expression is a string-literal, numeric-literal,
+         * or unique symbol type, we can use that type as the name of the symbol.
+         *
+         * For example, given:
+         *
+         *   const x = Symbol();
+         *
+         *   interface I {
+         *     [x]: number;
+         *   }
+         *
+         * The binder gives the property `[x]: number` a special symbol with the name "__computed".
+         * In the late-binding phase we can type-check the expression `x` and see that it has a
+         * unique symbol type which we can then use as the name of the member. This allows users
+         * to define custom symbols that can be used in the members of an object type.
+         *
+         * @param parent The containing symbol for the member.
+         * @param earlySymbols The early-bound symbols of the parent.
+         * @param lateSymbols The late-bound symbols of the parent.
+         * @param decl The member to bind.
+         */
         function lateBindMember(parent, earlySymbols, lateSymbols, decl) {
             ts.Debug.assert(!!decl.symbol, "The member is expected to have a symbol.");
             var links = getNodeLinks(decl);
             if (!links.resolvedSymbol) {
+                // In the event we attempt to resolve the late-bound name of this member recursively,
+                // fall back to the early-bound name of this member.
                 links.resolvedSymbol = decl.symbol;
                 var type = checkComputedPropertyName(decl.name);
                 if (isTypeUsableAsLateBoundName(type)) {
                     var memberName = getLateBoundNameFromType(type);
                     var symbolFlags = decl.symbol.flags;
+                    // Get or add a late-bound symbol for the member. This allows us to merge late-bound accessor declarations.
                     var lateSymbol = lateSymbols.get(memberName);
                     if (!lateSymbol)
-                        lateSymbols.set(memberName, lateSymbol = createSymbol(0, memberName, 1024));
+                        lateSymbols.set(memberName, lateSymbol = createSymbol(0 /* None */, memberName, 1024 /* Late */));
+                    // Report an error if a late-bound member has the same name as an early-bound member,
+                    // or if we have another early-bound symbol declaration with the same name and
+                    // conflicting flags.
                     var earlySymbol = earlySymbols && earlySymbols.get(memberName);
                     if (lateSymbol.flags & getExcludedSymbolFlags(symbolFlags) || earlySymbol) {
+                        // If we have an existing early-bound member, combine its declarations so that we can
+                        // report an error at each declaration.
                         var declarations = earlySymbol ? ts.concatenate(earlySymbol.declarations, lateSymbol.declarations) : lateSymbol.declarations;
-                        var name_2 = ts.declarationNameToString(decl.name);
-                        ts.forEach(declarations, function (declaration) { return error(ts.getNameOfDeclaration(declaration) || declaration, ts.Diagnostics.Duplicate_declaration_0, name_2); });
-                        error(decl.name || decl, ts.Diagnostics.Duplicate_declaration_0, name_2);
-                        lateSymbol = createSymbol(0, memberName, 1024);
+                        var name_1 = ts.declarationNameToString(decl.name);
+                        ts.forEach(declarations, function (declaration) { return error(ts.getNameOfDeclaration(declaration) || declaration, ts.Diagnostics.Duplicate_declaration_0, name_1); });
+                        error(decl.name || decl, ts.Diagnostics.Duplicate_declaration_0, name_1);
+                        lateSymbol = createSymbol(0 /* None */, memberName, 1024 /* Late */);
                     }
                     lateSymbol.nameType = type;
                     addDeclarationToLateBoundSymbol(lateSymbol, decl, symbolFlags);
@@ -26227,18 +34500,22 @@ var ts;
         function getResolvedMembersOrExportsOfSymbol(symbol, resolutionKind) {
             var links = getSymbolLinks(symbol);
             if (!links[resolutionKind]) {
-                var isStatic = resolutionKind === "resolvedExports";
+                var isStatic = resolutionKind === "resolvedExports" /* resolvedExports */;
                 var earlySymbols = !isStatic ? symbol.members :
-                    symbol.flags & 1536 ? getExportsOfModuleWorker(symbol) :
+                    symbol.flags & 1536 /* Module */ ? getExportsOfModuleWorker(symbol) :
                         symbol.exports;
+                // In the event we recursively resolve the members/exports of the symbol, we
+                // set the initial value of resolvedMembers/resolvedExports to the early-bound
+                // members/exports of the symbol.
                 links[resolutionKind] = earlySymbols || emptySymbols;
+                // fill in any as-yet-unresolved late-bound members.
                 var lateSymbols = ts.createSymbolTable();
                 for (var _i = 0, _a = symbol.declarations; _i < _a.length; _i++) {
                     var decl = _a[_i];
                     var members = ts.getMembersOfDeclaration(decl);
                     if (members) {
-                        for (var _b = 0, members_4 = members; _b < members_4.length; _b++) {
-                            var member = members_4[_b];
+                        for (var _b = 0, members_3 = members; _b < members_3.length; _b++) {
+                            var member = members_3[_b];
                             if (isStatic === ts.hasStaticModifier(member) && hasLateBindableName(member)) {
                                 lateBindMember(symbol, earlySymbols, lateSymbols, member);
                             }
@@ -26249,15 +34526,27 @@ var ts;
             }
             return links[resolutionKind];
         }
+        /**
+         * Gets a SymbolTable containing both the early- and late-bound members of a symbol.
+         *
+         * For a description of late-binding, see `lateBindMember`.
+         */
         function getMembersOfSymbol(symbol) {
-            return symbol.flags & 6240
-                ? getResolvedMembersOrExportsOfSymbol(symbol, "resolvedMembers")
+            return symbol.flags & 6240 /* LateBindingContainer */
+                ? getResolvedMembersOrExportsOfSymbol(symbol, "resolvedMembers" /* resolvedMembers */)
                 : symbol.members || emptySymbols;
         }
+        /**
+         * If a symbol is the dynamic name of the member of an object type, get the late-bound
+         * symbol of the member.
+         *
+         * For a description of late-binding, see `lateBindMember`.
+         */
         function getLateBoundSymbol(symbol) {
-            if (symbol.flags & 106500 && symbol.escapedName === "__computed") {
+            if (symbol.flags & 106500 /* ClassMember */ && symbol.escapedName === "__computed" /* Computed */) {
                 var links = getSymbolLinks(symbol);
                 if (!links.lateSymbol && ts.some(symbol.declarations, hasLateBindableName)) {
+                    // force late binding of members/exports. This will set the late-bound symbol
                     if (ts.some(symbol.declarations, ts.hasStaticModifier)) {
                         getExportsOfSymbol(symbol.parent);
                     }
@@ -26270,7 +34559,7 @@ var ts;
             return symbol;
         }
         function getTypeWithThisArgument(type, thisArgument, needApparentType) {
-            if (ts.getObjectFlags(type) & 4) {
+            if (ts.getObjectFlags(type) & 4 /* Reference */) {
                 var target = type.target;
                 var typeArguments = type.typeArguments;
                 if (ts.length(target.typeParameters) === ts.length(typeArguments)) {
@@ -26278,7 +34567,7 @@ var ts;
                     return needApparentType ? getApparentType(ref) : ref;
                 }
             }
-            else if (type.flags & 524288) {
+            else if (type.flags & 524288 /* Intersection */) {
                 return getIntersectionType(ts.map(type.types, function (t) { return getTypeWithThisArgument(t, thisArgument, needApparentType); }));
             }
             return needApparentType ? getApparentType(type) : type;
@@ -26300,7 +34589,7 @@ var ts;
             }
             else {
                 mapper = createTypeMapper(typeParameters, typeArguments);
-                members = createInstantiatedSymbolTable(source.declaredProperties, mapper, typeParameters.length === 1);
+                members = createInstantiatedSymbolTable(source.declaredProperties, mapper, /*mappingThisOnly*/ typeParameters.length === 1);
                 callSignatures = instantiateSignatures(source.declaredCallSignatures, mapper);
                 constructSignatures = instantiateSignatures(source.declaredConstructSignatures, mapper);
                 stringIndexInfo = instantiateIndexInfo(source.declaredStringIndexInfo, mapper);
@@ -26317,14 +34606,14 @@ var ts;
                     var baseType = baseTypes_1[_i];
                     var instantiatedBaseType = thisArgument ? getTypeWithThisArgument(instantiateType(baseType, mapper), thisArgument) : baseType;
                     addInheritedMembers(members, getPropertiesOfType(instantiatedBaseType));
-                    callSignatures = ts.concatenate(callSignatures, getSignaturesOfType(instantiatedBaseType, 0));
-                    constructSignatures = ts.concatenate(constructSignatures, getSignaturesOfType(instantiatedBaseType, 1));
+                    callSignatures = ts.concatenate(callSignatures, getSignaturesOfType(instantiatedBaseType, 0 /* Call */));
+                    constructSignatures = ts.concatenate(constructSignatures, getSignaturesOfType(instantiatedBaseType, 1 /* Construct */));
                     if (!stringIndexInfo) {
                         stringIndexInfo = instantiatedBaseType === anyType ?
-                            createIndexInfo(anyType, false) :
-                            getIndexInfoOfType(instantiatedBaseType, 0);
+                            createIndexInfo(anyType, /*isReadonly*/ false) :
+                            getIndexInfoOfType(instantiatedBaseType, 0 /* String */);
                     }
-                    numberIndexInfo = numberIndexInfo || getIndexInfoOfType(instantiatedBaseType, 1);
+                    numberIndexInfo = numberIndexInfo || getIndexInfoOfType(instantiatedBaseType, 1 /* Number */);
                 }
             }
             setStructuredTypeMembers(type, members, callSignatures, constructSignatures, stringIndexInfo, numberIndexInfo);
@@ -26355,13 +34644,14 @@ var ts;
             return sig;
         }
         function cloneSignature(sig) {
-            return createSignature(sig.declaration, sig.typeParameters, sig.thisParameter, sig.parameters, undefined, undefined, sig.minArgumentCount, sig.hasRestParameter, sig.hasLiteralTypes);
+            return createSignature(sig.declaration, sig.typeParameters, sig.thisParameter, sig.parameters, /*resolvedReturnType*/ undefined, 
+            /*resolvedTypePredicate*/ undefined, sig.minArgumentCount, sig.hasRestParameter, sig.hasLiteralTypes);
         }
         function getDefaultConstructSignatures(classType) {
             var baseConstructorType = getBaseConstructorTypeOfClass(classType);
-            var baseSignatures = getSignaturesOfType(baseConstructorType, 1);
+            var baseSignatures = getSignaturesOfType(baseConstructorType, 1 /* Construct */);
             if (baseSignatures.length === 0) {
-                return [createSignature(undefined, classType.localTypeParameters, undefined, ts.emptyArray, classType, undefined, 0, false, false)];
+                return [createSignature(undefined, classType.localTypeParameters, undefined, ts.emptyArray, classType, /*resolvedTypePredicate*/ undefined, 0, /*hasRestParameter*/ false, /*hasLiteralTypes*/ false)]; // TODO: GH#18217
             }
             var baseTypeNode = getBaseTypeNodeOfClass(classType);
             var isJavaScript = ts.isInJavaScriptFile(baseTypeNode);
@@ -26391,11 +34681,13 @@ var ts;
         }
         function findMatchingSignatures(signatureLists, signature, listIndex) {
             if (signature.typeParameters) {
+                // We require an exact match for generic signatures, so we only return signatures from the first
+                // signature list and only if they have exact matches in the other signature lists.
                 if (listIndex > 0) {
                     return undefined;
                 }
                 for (var i = 1; i < signatureLists.length; i++) {
-                    if (!findMatchingSignature(signatureLists[i], signature, false, false, false)) {
+                    if (!findMatchingSignature(signatureLists[i], signature, /*partialMatch*/ false, /*ignoreThisTypes*/ false, /*ignoreReturnTypes*/ false)) {
                         return undefined;
                     }
                 }
@@ -26403,7 +34695,8 @@ var ts;
             }
             var result;
             for (var i = 0; i < signatureLists.length; i++) {
-                var match = i === listIndex ? signature : findMatchingSignature(signatureLists[i], signature, true, true, true);
+                // Allow matching non-generic signatures to have excess parameters and different return types
+                var match = i === listIndex ? signature : findMatchingSignature(signatureLists[i], signature, /*partialMatch*/ true, /*ignoreThisTypes*/ true, /*ignoreReturnTypes*/ true);
                 if (!match) {
                     return undefined;
                 }
@@ -26411,20 +34704,27 @@ var ts;
             }
             return result;
         }
+        // The signatures of a union type are those signatures that are present in each of the constituent types.
+        // Generic signatures must match exactly, but non-generic signatures are allowed to have extra optional
+        // parameters and may differ in return types. When signatures differ in return types, the resulting return
+        // type is the union of the constituent return types.
         function getUnionSignatures(types, kind) {
             var signatureLists = ts.map(types, function (t) { return getSignaturesOfType(t, kind); });
             var result;
             for (var i = 0; i < signatureLists.length; i++) {
                 for (var _i = 0, _a = signatureLists[i]; _i < _a.length; _i++) {
                     var signature = _a[_i];
-                    if (!result || !findMatchingSignature(result, signature, false, true, true)) {
+                    // Only process signatures with parameter lists that aren't already in the result list
+                    if (!result || !findMatchingSignature(result, signature, /*partialMatch*/ false, /*ignoreThisTypes*/ true, /*ignoreReturnTypes*/ true)) {
                         var unionSignatures = findMatchingSignatures(signatureLists, signature, i);
                         if (unionSignatures) {
                             var s = signature;
+                            // Union the result types when more than one signature matches
                             if (unionSignatures.length > 1) {
                                 var thisParameter = signature.thisParameter;
                                 if (ts.forEach(unionSignatures, function (sig) { return sig.thisParameter; })) {
-                                    var thisType = getUnionType(ts.map(unionSignatures, function (sig) { return sig.thisParameter ? getTypeOfSymbol(sig.thisParameter) : anyType; }), 2);
+                                    // TODO: GH#18217 We tested that *some* has thisParameter and now act as if *all* do
+                                    var thisType = getUnionType(ts.map(unionSignatures, function (sig) { return sig.thisParameter ? getTypeOfSymbol(sig.thisParameter) : anyType; }), 2 /* Subtype */);
                                     thisParameter = createSymbolWithType(signature.thisParameter, thisType);
                                 }
                                 s = cloneSignature(signature);
@@ -26450,13 +34750,15 @@ var ts;
                 indexTypes.push(indexInfo.type);
                 isAnyReadonly = isAnyReadonly || indexInfo.isReadonly;
             }
-            return createIndexInfo(getUnionType(indexTypes, 2), isAnyReadonly);
+            return createIndexInfo(getUnionType(indexTypes, 2 /* Subtype */), isAnyReadonly);
         }
         function resolveUnionTypeMembers(type) {
-            var callSignatures = getUnionSignatures(type.types, 0);
-            var constructSignatures = getUnionSignatures(type.types, 1);
-            var stringIndexInfo = getUnionIndexInfo(type.types, 0);
-            var numberIndexInfo = getUnionIndexInfo(type.types, 1);
+            // The members and properties collections are empty for union types. To get all properties of a union
+            // type use getPropertiesOfType (only the language service uses this).
+            var callSignatures = getUnionSignatures(type.types, 0 /* Call */);
+            var constructSignatures = getUnionSignatures(type.types, 1 /* Construct */);
+            var stringIndexInfo = getUnionIndexInfo(type.types, 0 /* String */);
+            var numberIndexInfo = getUnionIndexInfo(type.types, 1 /* Number */);
             setStructuredTypeMembers(type, emptySymbols, callSignatures, constructSignatures, stringIndexInfo, numberIndexInfo);
         }
         function intersectTypes(type1, type2) {
@@ -26475,22 +34777,29 @@ var ts;
                     mixedTypes.push(type);
                 }
                 else if (isMixinConstructorType(types[i])) {
-                    mixedTypes.push(getReturnTypeOfSignature(getSignaturesOfType(types[i], 1)[0]));
+                    mixedTypes.push(getReturnTypeOfSignature(getSignaturesOfType(types[i], 1 /* Construct */)[0]));
                 }
             }
             return getIntersectionType(mixedTypes);
         }
         function resolveIntersectionTypeMembers(type) {
+            // The members and properties collections are empty for intersection types. To get all properties of an
+            // intersection type use getPropertiesOfType (only the language service uses this).
             var callSignatures = ts.emptyArray;
             var constructSignatures = ts.emptyArray;
             var stringIndexInfo;
             var numberIndexInfo;
             var types = type.types;
             var mixinCount = ts.countWhere(types, isMixinConstructorType);
-            var _loop_4 = function (i) {
+            var _loop_2 = function (i) {
                 var t = type.types[i];
+                // When an intersection type contains mixin constructor types, the construct signatures from
+                // those types are discarded and their return types are mixed into the return types of all
+                // other construct signatures in the intersection type. For example, the intersection type
+                // '{ new(...args: any[]) => A } & { new(s: string) => B }' has a single construct signature
+                // 'new(s: string) => A & B'.
                 if (mixinCount === 0 || mixinCount === types.length && i === 0 || !isMixinConstructorType(t)) {
-                    var signatures = getSignaturesOfType(t, 1);
+                    var signatures = getSignaturesOfType(t, 1 /* Construct */);
                     if (signatures.length && mixinCount > 0) {
                         signatures = ts.map(signatures, function (s) {
                             var clone = cloneSignature(s);
@@ -26500,59 +34809,68 @@ var ts;
                     }
                     constructSignatures = ts.concatenate(constructSignatures, signatures);
                 }
-                callSignatures = ts.concatenate(callSignatures, getSignaturesOfType(t, 0));
-                stringIndexInfo = intersectIndexInfos(stringIndexInfo, getIndexInfoOfType(t, 0));
-                numberIndexInfo = intersectIndexInfos(numberIndexInfo, getIndexInfoOfType(t, 1));
+                callSignatures = ts.concatenate(callSignatures, getSignaturesOfType(t, 0 /* Call */));
+                stringIndexInfo = intersectIndexInfos(stringIndexInfo, getIndexInfoOfType(t, 0 /* String */));
+                numberIndexInfo = intersectIndexInfos(numberIndexInfo, getIndexInfoOfType(t, 1 /* Number */));
             };
             for (var i = 0; i < types.length; i++) {
-                _loop_4(i);
+                _loop_2(i);
             }
             setStructuredTypeMembers(type, emptySymbols, callSignatures, constructSignatures, stringIndexInfo, numberIndexInfo);
         }
+        /**
+         * Converts an AnonymousType to a ResolvedType.
+         */
         function resolveAnonymousTypeMembers(type) {
             var symbol = type.symbol;
             if (type.target) {
-                var members = createInstantiatedSymbolTable(getPropertiesOfObjectType(type.target), type.mapper, false);
-                var callSignatures = instantiateSignatures(getSignaturesOfType(type.target, 0), type.mapper);
-                var constructSignatures = instantiateSignatures(getSignaturesOfType(type.target, 1), type.mapper);
-                var stringIndexInfo = instantiateIndexInfo(getIndexInfoOfType(type.target, 0), type.mapper);
-                var numberIndexInfo = instantiateIndexInfo(getIndexInfoOfType(type.target, 1), type.mapper);
+                var members = createInstantiatedSymbolTable(getPropertiesOfObjectType(type.target), type.mapper, /*mappingThisOnly*/ false);
+                var callSignatures = instantiateSignatures(getSignaturesOfType(type.target, 0 /* Call */), type.mapper);
+                var constructSignatures = instantiateSignatures(getSignaturesOfType(type.target, 1 /* Construct */), type.mapper);
+                var stringIndexInfo = instantiateIndexInfo(getIndexInfoOfType(type.target, 0 /* String */), type.mapper);
+                var numberIndexInfo = instantiateIndexInfo(getIndexInfoOfType(type.target, 1 /* Number */), type.mapper);
                 setStructuredTypeMembers(type, members, callSignatures, constructSignatures, stringIndexInfo, numberIndexInfo);
             }
-            else if (symbol.flags & 2048) {
+            else if (symbol.flags & 2048 /* TypeLiteral */) {
                 var members = getMembersOfSymbol(symbol);
-                var callSignatures = getSignaturesOfSymbol(members.get("__call"));
-                var constructSignatures = getSignaturesOfSymbol(members.get("__new"));
-                var stringIndexInfo = getIndexInfoOfSymbol(symbol, 0);
-                var numberIndexInfo = getIndexInfoOfSymbol(symbol, 1);
+                var callSignatures = getSignaturesOfSymbol(members.get("__call" /* Call */));
+                var constructSignatures = getSignaturesOfSymbol(members.get("__new" /* New */));
+                var stringIndexInfo = getIndexInfoOfSymbol(symbol, 0 /* String */);
+                var numberIndexInfo = getIndexInfoOfSymbol(symbol, 1 /* Number */);
                 setStructuredTypeMembers(type, members, callSignatures, constructSignatures, stringIndexInfo, numberIndexInfo);
             }
             else {
+                // Combinations of function, class, enum and module
                 var members = emptySymbols;
                 var stringIndexInfo = void 0;
                 if (symbol.exports) {
                     members = getExportsOfSymbol(symbol);
                 }
                 setStructuredTypeMembers(type, members, ts.emptyArray, ts.emptyArray, undefined, undefined);
-                if (symbol.flags & 32) {
+                if (symbol.flags & 32 /* Class */) {
                     var classType = getDeclaredTypeOfClassOrInterface(symbol);
                     var baseConstructorType = getBaseConstructorTypeOfClass(classType);
-                    if (baseConstructorType.flags & (131072 | 524288 | 2162688)) {
+                    if (baseConstructorType.flags & (131072 /* Object */ | 524288 /* Intersection */ | 2162688 /* TypeVariable */)) {
                         members = ts.createSymbolTable(getNamedMembers(members));
                         addInheritedMembers(members, getPropertiesOfType(baseConstructorType));
                     }
                     else if (baseConstructorType === anyType) {
-                        stringIndexInfo = createIndexInfo(anyType, false);
+                        stringIndexInfo = createIndexInfo(anyType, /*isReadonly*/ false);
                     }
                 }
-                var numberIndexInfo = symbol.flags & 384 ? enumNumberIndexInfo : undefined;
+                var numberIndexInfo = symbol.flags & 384 /* Enum */ ? enumNumberIndexInfo : undefined;
                 setStructuredTypeMembers(type, members, ts.emptyArray, ts.emptyArray, stringIndexInfo, numberIndexInfo);
-                if (symbol.flags & (16 | 8192)) {
+                // We resolve the members before computing the signatures because a signature may use
+                // typeof with a qualified name expression that circularly references the type we are
+                // in the process of resolving (see issue #6072). The temporarily empty signature list
+                // will never be observed because a qualified name can't reference signatures.
+                if (symbol.flags & (16 /* Function */ | 8192 /* Method */)) {
                     type.callSignatures = getSignaturesOfSymbol(symbol);
                 }
-                if (symbol.flags & 32) {
+                // And likewise for construct signatures for classes
+                if (symbol.flags & 32 /* Class */) {
                     var classType = getDeclaredTypeOfClassOrInterface(symbol);
-                    var constructSignatures = getSignaturesOfSymbol(symbol.members.get("__constructor"));
+                    var constructSignatures = getSignaturesOfSymbol(symbol.members.get("__constructor" /* Constructor */));
                     if (!constructSignatures.length) {
                         constructSignatures = getDefaultConstructSignatures(classType);
                     }
@@ -26561,16 +34879,16 @@ var ts;
             }
         }
         function resolveReverseMappedTypeMembers(type) {
-            var indexInfo = getIndexInfoOfType(type.source, 0);
+            var indexInfo = getIndexInfoOfType(type.source, 0 /* String */);
             var modifiers = getMappedTypeModifiers(type.mappedType);
-            var readonlyMask = modifiers & 1 ? false : true;
-            var optionalMask = modifiers & 4 ? 0 : 16777216;
+            var readonlyMask = modifiers & 1 /* IncludeReadonly */ ? false : true;
+            var optionalMask = modifiers & 4 /* IncludeOptional */ ? 0 : 16777216 /* Optional */;
             var stringIndexInfo = indexInfo && createIndexInfo(inferReverseMappedType(indexInfo.type, type.mappedType), readonlyMask && indexInfo.isReadonly);
             var members = ts.createSymbolTable();
             for (var _i = 0, _a = getPropertiesOfType(type.source); _i < _a.length; _i++) {
                 var prop = _a[_i];
-                var checkFlags = 2048 | (readonlyMask && isReadonlySymbol(prop) ? 8 : 0);
-                var inferredProp = createSymbol(4 | prop.flags & optionalMask, prop.escapedName, checkFlags);
+                var checkFlags = 2048 /* ReverseMapped */ | (readonlyMask && isReadonlySymbol(prop) ? 8 /* Readonly */ : 0);
+                var inferredProp = createSymbol(4 /* Property */ | prop.flags & optionalMask, prop.escapedName, checkFlags);
                 inferredProp.declarations = prop.declarations;
                 inferredProp.nameType = prop.nameType;
                 inferredProp.propertyType = getTypeOfSymbol(prop);
@@ -26579,48 +34897,64 @@ var ts;
             }
             setStructuredTypeMembers(type, members, ts.emptyArray, ts.emptyArray, stringIndexInfo, undefined);
         }
+        /** Resolve the members of a mapped type { [P in K]: T } */
         function resolveMappedTypeMembers(type) {
             var members = ts.createSymbolTable();
             var stringIndexInfo;
             var numberIndexInfo;
+            // Resolve upfront such that recursive references see an empty object type.
             setStructuredTypeMembers(type, emptySymbols, ts.emptyArray, ts.emptyArray, undefined, undefined);
+            // In { [P in K]: T }, we refer to P as the type parameter type, K as the constraint type,
+            // and T as the template type.
             var typeParameter = getTypeParameterFromMappedType(type);
             var constraintType = getConstraintTypeFromMappedType(type);
             var templateType = getTemplateTypeFromMappedType(type.target || type);
-            var modifiersType = getApparentType(getModifiersTypeFromMappedType(type));
+            var modifiersType = getApparentType(getModifiersTypeFromMappedType(type)); // The 'T' in 'keyof T'
             var templateModifiers = getMappedTypeModifiers(type);
-            var include = keyofStringsOnly ? 64 : 2240;
+            var include = keyofStringsOnly ? 64 /* StringLiteral */ : 2240 /* StringOrNumberLiteralOrUnique */;
             if (isMappedTypeWithKeyofConstraintDeclaration(type)) {
+                // We have a { [P in keyof T]: X }
                 for (var _i = 0, _a = getPropertiesOfType(modifiersType); _i < _a.length; _i++) {
                     var prop = _a[_i];
-                    addMemberForKeyType(getLiteralTypeFromPropertyName(prop, include), undefined, prop);
+                    addMemberForKeyType(getLiteralTypeFromPropertyName(prop, include), /*_index*/ undefined, prop);
                 }
-                if (modifiersType.flags & 1 || getIndexInfoOfType(modifiersType, 0)) {
+                if (modifiersType.flags & 1 /* Any */ || getIndexInfoOfType(modifiersType, 0 /* String */)) {
                     addMemberForKeyType(stringType);
                 }
-                if (!keyofStringsOnly && getIndexInfoOfType(modifiersType, 1)) {
+                if (!keyofStringsOnly && getIndexInfoOfType(modifiersType, 1 /* Number */)) {
                     addMemberForKeyType(numberType);
                 }
             }
             else {
-                var keyType = constraintType.flags & 14745600 ? getApparentType(constraintType) : constraintType;
-                var iterationType = keyType.flags & 1048576 ? getIndexType(getApparentType(keyType.type)) : keyType;
+                // First, if the constraint type is a type parameter, obtain the base constraint. Then,
+                // if the key type is a 'keyof X', obtain 'keyof C' where C is the base constraint of X.
+                // Finally, iterate over the constituents of the resulting iteration type.
+                var keyType = constraintType.flags & 14745600 /* InstantiableNonPrimitive */ ? getApparentType(constraintType) : constraintType;
+                var iterationType = keyType.flags & 1048576 /* Index */ ? getIndexType(getApparentType(keyType.type)) : keyType;
                 forEachType(iterationType, addMemberForKeyType);
             }
             setStructuredTypeMembers(type, members, ts.emptyArray, ts.emptyArray, stringIndexInfo, numberIndexInfo);
             function addMemberForKeyType(t, _index, origin) {
+                // Create a mapper from T to the current iteration type constituent. Then, if the
+                // mapped type is itself an instantiated type, combine the iteration mapper with the
+                // instantiation mapper.
                 var templateMapper = combineTypeMappers(type.mapper, createTypeMapper([typeParameter], [t]));
                 var propType = instantiateType(templateType, templateMapper);
-                if (t.flags & 2240) {
+                // If the current iteration type constituent is a string literal type, create a property.
+                // Otherwise, for type string create a string index signature.
+                if (t.flags & 2240 /* StringOrNumberLiteralOrUnique */) {
                     var propName = getLateBoundNameFromType(t);
                     var modifiersProp = getPropertyOfType(modifiersType, propName);
-                    var isOptional = !!(templateModifiers & 4 ||
-                        !(templateModifiers & 8) && modifiersProp && modifiersProp.flags & 16777216);
-                    var isReadonly = !!(templateModifiers & 1 ||
-                        !(templateModifiers & 2) && modifiersProp && isReadonlySymbol(modifiersProp));
-                    var prop = createSymbol(4 | (isOptional ? 16777216 : 0), propName, isReadonly ? 8 : 0);
+                    var isOptional = !!(templateModifiers & 4 /* IncludeOptional */ ||
+                        !(templateModifiers & 8 /* ExcludeOptional */) && modifiersProp && modifiersProp.flags & 16777216 /* Optional */);
+                    var isReadonly = !!(templateModifiers & 1 /* IncludeReadonly */ ||
+                        !(templateModifiers & 2 /* ExcludeReadonly */) && modifiersProp && isReadonlySymbol(modifiersProp));
+                    var prop = createSymbol(4 /* Property */ | (isOptional ? 16777216 /* Optional */ : 0), propName, isReadonly ? 8 /* Readonly */ : 0);
+                    // When creating an optional property in strictNullChecks mode, if 'undefined' isn't assignable to the
+                    // type, we include 'undefined' in the type. Similarly, when creating a non-optional property in strictNullChecks
+                    // mode, if the underlying property is optional we remove 'undefined' from the type.
                     prop.type = strictNullChecks && isOptional && !isTypeAssignableTo(undefinedType, propType) ? getOptionalType(propType) :
-                        strictNullChecks && !isOptional && modifiersProp && modifiersProp.flags & 16777216 ? getTypeWithFacts(propType, 131072) :
+                        strictNullChecks && !isOptional && modifiersProp && modifiersProp.flags & 16777216 /* Optional */ ? getTypeWithFacts(propType, 131072 /* NEUndefined */) :
                             propType;
                     if (origin) {
                         prop.syntheticOrigin = origin;
@@ -26629,11 +34963,11 @@ var ts;
                     prop.nameType = t;
                     members.set(propName, prop);
                 }
-                else if (t.flags & (1 | 4)) {
-                    stringIndexInfo = createIndexInfo(propType, !!(templateModifiers & 1));
+                else if (t.flags & (1 /* Any */ | 4 /* String */)) {
+                    stringIndexInfo = createIndexInfo(propType, !!(templateModifiers & 1 /* IncludeReadonly */));
                 }
-                else if (t.flags & 8) {
-                    numberIndexInfo = createIndexInfo(propType, !!(templateModifiers & 1));
+                else if (t.flags & 8 /* Number */) {
+                    numberIndexInfo = createIndexInfo(propType, !!(templateModifiers & 1 /* IncludeReadonly */));
                 }
             }
         }
@@ -26648,39 +34982,45 @@ var ts;
         function getTemplateTypeFromMappedType(type) {
             return type.templateType ||
                 (type.templateType = type.declaration.type ?
-                    instantiateType(addOptionality(getTypeFromTypeNode(type.declaration.type), !!(getMappedTypeModifiers(type) & 4)), type.mapper || identityMapper) :
+                    instantiateType(addOptionality(getTypeFromTypeNode(type.declaration.type), !!(getMappedTypeModifiers(type) & 4 /* IncludeOptional */)), type.mapper || identityMapper) :
                     errorType);
         }
         function getConstraintDeclarationForMappedType(type) {
             return type.declaration.typeParameter.constraint;
         }
         function isMappedTypeWithKeyofConstraintDeclaration(type) {
-            var constraintDeclaration = getConstraintDeclarationForMappedType(type);
-            return constraintDeclaration.kind === 175 &&
-                constraintDeclaration.operator === 128;
+            var constraintDeclaration = getConstraintDeclarationForMappedType(type); // TODO: GH#18217
+            return constraintDeclaration.kind === 175 /* TypeOperator */ &&
+                constraintDeclaration.operator === 128 /* KeyOfKeyword */;
         }
         function getModifiersTypeFromMappedType(type) {
             if (!type.modifiersType) {
                 if (isMappedTypeWithKeyofConstraintDeclaration(type)) {
+                    // If the constraint declaration is a 'keyof T' node, the modifiers type is T. We check
+                    // AST nodes here because, when T is a non-generic type, the logic below eagerly resolves
+                    // 'keyof T' to a literal union type and we can't recover T from that type.
                     type.modifiersType = instantiateType(getTypeFromTypeNode(getConstraintDeclarationForMappedType(type).type), type.mapper || identityMapper);
                 }
                 else {
+                    // Otherwise, get the declared constraint type, and if the constraint type is a type parameter,
+                    // get the constraint of that type parameter. If the resulting type is an indexed type 'keyof T',
+                    // the modifiers type is T. Otherwise, the modifiers type is {}.
                     var declaredType = getTypeFromMappedTypeNode(type.declaration);
                     var constraint = getConstraintTypeFromMappedType(declaredType);
-                    var extendedConstraint = constraint && constraint.flags & 65536 ? getConstraintOfTypeParameter(constraint) : constraint;
-                    type.modifiersType = extendedConstraint && extendedConstraint.flags & 1048576 ? instantiateType(extendedConstraint.type, type.mapper || identityMapper) : emptyObjectType;
+                    var extendedConstraint = constraint && constraint.flags & 65536 /* TypeParameter */ ? getConstraintOfTypeParameter(constraint) : constraint;
+                    type.modifiersType = extendedConstraint && extendedConstraint.flags & 1048576 /* Index */ ? instantiateType(extendedConstraint.type, type.mapper || identityMapper) : emptyObjectType;
                 }
             }
             return type.modifiersType;
         }
         function getMappedTypeModifiers(type) {
             var declaration = type.declaration;
-            return (declaration.readonlyToken ? declaration.readonlyToken.kind === 38 ? 2 : 1 : 0) |
-                (declaration.questionToken ? declaration.questionToken.kind === 38 ? 8 : 4 : 0);
+            return (declaration.readonlyToken ? declaration.readonlyToken.kind === 38 /* MinusToken */ ? 2 /* ExcludeReadonly */ : 1 /* IncludeReadonly */ : 0) |
+                (declaration.questionToken ? declaration.questionToken.kind === 38 /* MinusToken */ ? 8 /* ExcludeOptional */ : 4 /* IncludeOptional */ : 0);
         }
         function getMappedTypeOptionality(type) {
             var modifiers = getMappedTypeModifiers(type);
-            return modifiers & 8 ? -1 : modifiers & 4 ? 1 : 0;
+            return modifiers & 8 /* ExcludeOptional */ ? -1 : modifiers & 4 /* IncludeOptional */ ? 1 : 0;
         }
         function getCombinedMappedTypeOptionality(type) {
             var optionality = getMappedTypeOptionality(type);
@@ -26688,47 +35028,51 @@ var ts;
             return optionality || (isGenericMappedType(modifiersType) ? getMappedTypeOptionality(modifiersType) : 0);
         }
         function isPartialMappedType(type) {
-            return !!(ts.getObjectFlags(type) & 32 && getMappedTypeModifiers(type) & 4);
+            return !!(ts.getObjectFlags(type) & 32 /* Mapped */ && getMappedTypeModifiers(type) & 4 /* IncludeOptional */);
         }
         function isGenericMappedType(type) {
-            return !!(ts.getObjectFlags(type) & 32) && isGenericIndexType(getConstraintTypeFromMappedType(type));
+            return !!(ts.getObjectFlags(type) & 32 /* Mapped */) && isGenericIndexType(getConstraintTypeFromMappedType(type));
         }
         function resolveStructuredTypeMembers(type) {
             if (!type.members) {
-                if (type.flags & 131072) {
-                    if (type.objectFlags & 4) {
+                if (type.flags & 131072 /* Object */) {
+                    if (type.objectFlags & 4 /* Reference */) {
                         resolveTypeReferenceMembers(type);
                     }
-                    else if (type.objectFlags & 3) {
+                    else if (type.objectFlags & 3 /* ClassOrInterface */) {
                         resolveClassOrInterfaceMembers(type);
                     }
-                    else if (type.objectFlags & 2048) {
+                    else if (type.objectFlags & 2048 /* ReverseMapped */) {
                         resolveReverseMappedTypeMembers(type);
                     }
-                    else if (type.objectFlags & 16) {
+                    else if (type.objectFlags & 16 /* Anonymous */) {
                         resolveAnonymousTypeMembers(type);
                     }
-                    else if (type.objectFlags & 32) {
+                    else if (type.objectFlags & 32 /* Mapped */) {
                         resolveMappedTypeMembers(type);
                     }
                 }
-                else if (type.flags & 262144) {
+                else if (type.flags & 262144 /* Union */) {
                     resolveUnionTypeMembers(type);
                 }
-                else if (type.flags & 524288) {
+                else if (type.flags & 524288 /* Intersection */) {
                     resolveIntersectionTypeMembers(type);
                 }
             }
             return type;
         }
+        /** Return properties of an object type or an empty array for other types */
         function getPropertiesOfObjectType(type) {
-            if (type.flags & 131072) {
+            if (type.flags & 131072 /* Object */) {
                 return resolveStructuredTypeMembers(type).properties;
             }
             return ts.emptyArray;
         }
+        /** If the given type is an object type and that type has a property by the given name,
+         * return the symbol for that property. Otherwise return undefined.
+         */
         function getPropertyOfObjectType(type, name) {
-            if (type.flags & 131072) {
+            if (type.flags & 131072 /* Object */) {
                 var resolved = resolveStructuredTypeMembers(type);
                 var symbol = resolved.members.get(name);
                 if (symbol && symbolIsValue(symbol)) {
@@ -26750,7 +35094,9 @@ var ts;
                             }
                         }
                     }
-                    if (type.flags & 262144) {
+                    // The properties of a union type are those that are present in all constituent types, so
+                    // we only need to check the properties of the first type
+                    if (type.flags & 262144 /* Union */) {
                         break;
                     }
                 }
@@ -26760,13 +35106,13 @@ var ts;
         }
         function getPropertiesOfType(type) {
             type = getApparentType(type);
-            return type.flags & 786432 ?
+            return type.flags & 786432 /* UnionOrIntersection */ ?
                 getPropertiesOfUnionOrIntersectionType(type) :
                 getPropertiesOfObjectType(type);
         }
         function getAllPossiblePropertiesOfTypes(types) {
             var unionType = getUnionType(types);
-            if (!(unionType.flags & 262144)) {
+            if (!(unionType.flags & 262144 /* Union */)) {
                 return getAugmentedPropertiesOfType(unionType);
             }
             var props = ts.createSymbolTable();
@@ -26776,6 +35122,7 @@ var ts;
                     var escapedName = _b[_a].escapedName;
                     if (!props.has(escapedName)) {
                         var prop = createUnionOrIntersectionProperty(unionType, escapedName);
+                        // May be undefined if the property is private
                         if (prop)
                             props.set(escapedName, prop);
                     }
@@ -26784,9 +35131,9 @@ var ts;
             return ts.arrayFrom(props.values());
         }
         function getConstraintOfType(type) {
-            return type.flags & 65536 ? getConstraintOfTypeParameter(type) :
-                type.flags & 2097152 ? getConstraintOfIndexedAccess(type) :
-                    type.flags & 4194304 ? getConstraintOfConditionalType(type) :
+            return type.flags & 65536 /* TypeParameter */ ? getConstraintOfTypeParameter(type) :
+                type.flags & 2097152 /* IndexedAccess */ ? getConstraintOfIndexedAccess(type) :
+                    type.flags & 4194304 /* Conditional */ ? getConstraintOfConditionalType(type) :
                         getBaseConstraintOfType(type);
         }
         function getConstraintOfTypeParameter(typeParameter) {
@@ -26801,18 +35148,23 @@ var ts;
         function getDefaultConstraintOfConditionalType(type) {
             if (!type.resolvedDefaultConstraint) {
                 var rootTrueType = type.root.trueType;
-                var rootTrueConstraint = rootTrueType.flags & 8388608 ? rootTrueType.substitute : rootTrueType;
+                var rootTrueConstraint = rootTrueType.flags & 8388608 /* Substitution */ ? rootTrueType.substitute : rootTrueType;
                 type.resolvedDefaultConstraint = getUnionType([instantiateType(rootTrueConstraint, type.combinedMapper || type.mapper), getFalseTypeFromConditionalType(type)]);
             }
             return type.resolvedDefaultConstraint;
         }
         function getConstraintOfDistributiveConditionalType(type) {
+            // Check if we have a conditional type of the form 'T extends U ? X : Y', where T is a constrained
+            // type parameter. If so, create an instantiation of the conditional type where T is replaced
+            // with its constraint. We do this because if the constraint is a union type it will be distributed
+            // over the conditional type and possibly reduced. For example, 'T extends undefined ? never : T'
+            // removes 'undefined' from T.
             if (type.root.isDistributive) {
                 var constraint = getConstraintOfType(getSimplifiedType(type.checkType));
                 if (constraint) {
                     var mapper = makeUnaryTypeMapper(type.root.checkType, constraint);
                     var instantiated = getConditionalTypeInstantiation(type, combineTypeMappers(mapper, type.mapper));
-                    if (!(instantiated.flags & 32768)) {
+                    if (!(instantiated.flags & 32768 /* Never */)) {
                         return instantiated;
                     }
                 }
@@ -26827,27 +35179,35 @@ var ts;
             var hasDisjointDomainType = false;
             for (var _i = 0, _a = type.types; _i < _a.length; _i++) {
                 var t = _a[_i];
-                if (t.flags & 15794176) {
+                if (t.flags & 15794176 /* Instantiable */) {
+                    // We keep following constraints as long as we have an instantiable type that is known
+                    // not to be circular or infinite (hence we stop on index access types).
                     var constraint = getConstraintOfType(t);
-                    while (constraint && constraint.flags & (65536 | 1048576 | 4194304)) {
+                    while (constraint && constraint.flags & (65536 /* TypeParameter */ | 1048576 /* Index */ | 4194304 /* Conditional */)) {
                         constraint = getConstraintOfType(constraint);
                     }
                     if (constraint) {
-                        if (!(constraint.flags & 262144)) {
+                        // A constraint that isn't a union type implies that the final type would be a non-union
+                        // type as well. Since non-union constraints are of no interest, we can exit here.
+                        if (!(constraint.flags & 262144 /* Union */)) {
                             return undefined;
                         }
                         constraints = ts.append(constraints, constraint);
                     }
                 }
-                else if (t.flags & 16809468) {
+                else if (t.flags & 16809468 /* DisjointDomains */) {
                     hasDisjointDomainType = true;
                 }
             }
+            // If the target is a union type or if we are intersecting with types belonging to one of the
+            // disjoint domans, we may end up producing a constraint that hasn't been examined before.
             if (constraints && (targetIsUnion || hasDisjointDomainType)) {
                 if (hasDisjointDomainType) {
+                    // We add any types belong to one of the disjoint domans because they might cause the final
+                    // intersection operation to reduce the union constraints.
                     for (var _b = 0, _c = type.types; _b < _c.length; _b++) {
                         var t = _c[_b];
-                        if (t.flags & 16809468) {
+                        if (t.flags & 16809468 /* DisjointDomains */) {
                             constraints = ts.append(constraints, t);
                         }
                     }
@@ -26857,7 +35217,7 @@ var ts;
             return undefined;
         }
         function getBaseConstraintOfInstantiableNonPrimitiveUnionOrIntersection(type) {
-            if (type.flags & (14745600 | 786432)) {
+            if (type.flags & (14745600 /* InstantiableNonPrimitive */ | 786432 /* UnionOrIntersection */)) {
                 var constraint = getResolvedBaseConstraint(type);
                 if (constraint !== noConstraintType && constraint !== circularConstraintType) {
                     return constraint;
@@ -26866,17 +35226,26 @@ var ts;
         }
         function getBaseConstraintOfType(type) {
             var constraint = getBaseConstraintOfInstantiableNonPrimitiveUnionOrIntersection(type);
-            if (!constraint && type.flags & 1048576) {
+            if (!constraint && type.flags & 1048576 /* Index */) {
                 return keyofConstraintType;
             }
             return constraint;
         }
+        /**
+         * This is similar to `getBaseConstraintOfType` except it returns the input type if there's no base constraint, instead of `undefined`
+         * It also doesn't map indexes to `string`, as where this is used this would be unneeded (and likely undesirable)
+         */
         function getBaseConstraintOrType(type) {
             return getBaseConstraintOfType(type) || type;
         }
         function hasNonCircularBaseConstraint(type) {
             return getResolvedBaseConstraint(type) !== circularConstraintType;
         }
+        /**
+         * Return the resolved base constraint of a type variable. The noConstraintType singleton is returned if the
+         * type variable has no constraint, and the circularConstraintType singleton is returned if the constraint
+         * circularly references the type variable.
+         */
         function getResolvedBaseConstraint(type) {
             var circular;
             if (!type.resolvedBaseConstraint) {
@@ -26885,7 +35254,7 @@ var ts;
             }
             return type.resolvedBaseConstraint;
             function getBaseConstraint(t) {
-                if (!pushTypeResolution(t, 4)) {
+                if (!pushTypeResolution(t, 4 /* ResolvedBaseConstraint */)) {
                     circular = true;
                     return undefined;
                 }
@@ -26897,13 +35266,13 @@ var ts;
                 return result;
             }
             function computeBaseConstraint(t) {
-                if (t.flags & 65536) {
+                if (t.flags & 65536 /* TypeParameter */) {
                     var constraint = getConstraintFromTypeParameter(t);
                     return t.isThisType || !constraint ?
                         constraint :
                         getBaseConstraint(constraint);
                 }
-                if (t.flags & 786432) {
+                if (t.flags & 786432 /* UnionOrIntersection */) {
                     var types = t.types;
                     var baseTypes = [];
                     for (var _i = 0, types_4 = types; _i < types_4.length; _i++) {
@@ -26913,24 +35282,24 @@ var ts;
                             baseTypes.push(baseType);
                         }
                     }
-                    return t.flags & 262144 && baseTypes.length === types.length ? getUnionType(baseTypes) :
-                        t.flags & 524288 && baseTypes.length ? getIntersectionType(baseTypes) :
+                    return t.flags & 262144 /* Union */ && baseTypes.length === types.length ? getUnionType(baseTypes) :
+                        t.flags & 524288 /* Intersection */ && baseTypes.length ? getIntersectionType(baseTypes) :
                             undefined;
                 }
-                if (t.flags & 1048576) {
+                if (t.flags & 1048576 /* Index */) {
                     return keyofConstraintType;
                 }
-                if (t.flags & 2097152) {
+                if (t.flags & 2097152 /* IndexedAccess */) {
                     var baseObjectType = getBaseConstraint(t.objectType);
                     var baseIndexType = getBaseConstraint(t.indexType);
                     var baseIndexedAccess = baseObjectType && baseIndexType ? getIndexedAccessType(baseObjectType, baseIndexType) : undefined;
                     return baseIndexedAccess && baseIndexedAccess !== errorType ? getBaseConstraint(baseIndexedAccess) : undefined;
                 }
-                if (t.flags & 4194304) {
+                if (t.flags & 4194304 /* Conditional */) {
                     var constraint = getConstraintOfConditionalType(t);
                     return constraint && getBaseConstraint(constraint);
                 }
-                if (t.flags & 8388608) {
+                if (t.flags & 8388608 /* Substitution */) {
                     return getBaseConstraint(t.substitute);
                 }
                 if (isGenericMappedType(t)) {
@@ -26940,7 +35309,7 @@ var ts;
             }
         }
         function getApparentTypeOfIntersectionType(type) {
-            return type.resolvedApparentType || (type.resolvedApparentType = getTypeWithThisArgument(type, type, true));
+            return type.resolvedApparentType || (type.resolvedApparentType = getTypeWithThisArgument(type, type, /*apparentType*/ true));
         }
         function getResolvedTypeParameterDefault(typeParameter) {
             if (!typeParameter.default) {
@@ -26949,19 +35318,29 @@ var ts;
                     typeParameter.default = targetDefault ? instantiateType(targetDefault, typeParameter.mapper) : noConstraintType;
                 }
                 else {
+                    // To block recursion, set the initial value to the resolvingDefaultType.
                     typeParameter.default = resolvingDefaultType;
                     var defaultDeclaration = typeParameter.symbol && ts.forEach(typeParameter.symbol.declarations, function (decl) { return ts.isTypeParameterDeclaration(decl) && decl.default; });
                     var defaultType = defaultDeclaration ? getTypeFromTypeNode(defaultDeclaration) : noConstraintType;
                     if (typeParameter.default === resolvingDefaultType) {
+                        // If we have not been called recursively, set the correct default type.
                         typeParameter.default = defaultType;
                     }
                 }
             }
             else if (typeParameter.default === resolvingDefaultType) {
+                // If we are called recursively for this type parameter, mark the default as circular.
                 typeParameter.default = circularConstraintType;
             }
             return typeParameter.default;
         }
+        /**
+         * Gets the default type for a type parameter.
+         *
+         * If the type parameter is the result of an instantiation, this gets the instantiated
+         * default type of its target. If the type parameter has no default type or the default is
+         * circular, `undefined` is returned.
+         */
         function getDefaultFromTypeParameter(typeParameter) {
             var defaultType = getResolvedTypeParameterDefault(typeParameter);
             return defaultType !== noConstraintType && defaultType !== circularConstraintType ? defaultType : undefined;
@@ -26969,26 +35348,35 @@ var ts;
         function hasNonCircularTypeParameterDefault(typeParameter) {
             return getResolvedTypeParameterDefault(typeParameter) !== circularConstraintType;
         }
+        /**
+         * Indicates whether the declaration of a typeParameter has a default type.
+         */
         function hasTypeParameterDefault(typeParameter) {
             return !!(typeParameter.symbol && ts.forEach(typeParameter.symbol.declarations, function (decl) { return ts.isTypeParameterDeclaration(decl) && decl.default; }));
         }
+        /**
+         * For a type parameter, return the base constraint of the type parameter. For the string, number,
+         * boolean, and symbol primitive types, return the corresponding object types. Otherwise return the
+         * type itself. Note that the apparent type of a union type is the union type itself.
+         */
         function getApparentType(type) {
-            var t = type.flags & 15794176 ? getBaseConstraintOfType(type) || emptyObjectType : type;
-            return t.flags & 524288 ? getApparentTypeOfIntersectionType(t) :
-                t.flags & 68 ? globalStringType :
-                    t.flags & 168 ? globalNumberType :
-                        t.flags & 272 ? globalBooleanType :
-                            t.flags & 3072 ? getGlobalESSymbolType(languageVersion >= 2) :
-                                t.flags & 16777216 ? emptyObjectType :
-                                    t.flags & 1048576 ? keyofConstraintType :
+            var t = type.flags & 15794176 /* Instantiable */ ? getBaseConstraintOfType(type) || emptyObjectType : type;
+            return t.flags & 524288 /* Intersection */ ? getApparentTypeOfIntersectionType(t) :
+                t.flags & 68 /* StringLike */ ? globalStringType :
+                    t.flags & 168 /* NumberLike */ ? globalNumberType :
+                        t.flags & 272 /* BooleanLike */ ? globalBooleanType :
+                            t.flags & 3072 /* ESSymbolLike */ ? getGlobalESSymbolType(/*reportErrors*/ languageVersion >= 2 /* ES2015 */) :
+                                t.flags & 16777216 /* NonPrimitive */ ? emptyObjectType :
+                                    t.flags & 1048576 /* Index */ ? keyofConstraintType :
                                         t;
         }
         function createUnionOrIntersectionProperty(containingType, name) {
             var props;
-            var isUnion = containingType.flags & 262144;
-            var excludeModifiers = isUnion ? 24 : 0;
-            var commonFlags = isUnion ? 0 : 16777216;
-            var syntheticFlag = 4;
+            var isUnion = containingType.flags & 262144 /* Union */;
+            var excludeModifiers = isUnion ? 24 /* NonPublicAccessibilityModifier */ : 0;
+            // Flags we want to propagate to the result if they exist in all source symbols
+            var commonFlags = isUnion ? 0 /* None */ : 16777216 /* Optional */;
+            var syntheticFlag = 4 /* SyntheticMethod */;
             var checkFlags = 0;
             for (var _i = 0, _a = containingType.types; _i < _a.length; _i++) {
                 var current = _a[_i];
@@ -26999,24 +35387,24 @@ var ts;
                     if (prop && !(modifiers & excludeModifiers)) {
                         commonFlags &= prop.flags;
                         props = ts.appendIfUnique(props, prop);
-                        checkFlags |= (isReadonlySymbol(prop) ? 8 : 0) |
-                            (!(modifiers & 24) ? 64 : 0) |
-                            (modifiers & 16 ? 128 : 0) |
-                            (modifiers & 8 ? 256 : 0) |
-                            (modifiers & 32 ? 512 : 0);
+                        checkFlags |= (isReadonlySymbol(prop) ? 8 /* Readonly */ : 0) |
+                            (!(modifiers & 24 /* NonPublicAccessibilityModifier */) ? 64 /* ContainsPublic */ : 0) |
+                            (modifiers & 16 /* Protected */ ? 128 /* ContainsProtected */ : 0) |
+                            (modifiers & 8 /* Private */ ? 256 /* ContainsPrivate */ : 0) |
+                            (modifiers & 32 /* Static */ ? 512 /* ContainsStatic */ : 0);
                         if (!isPrototypeProperty(prop)) {
-                            syntheticFlag = 2;
+                            syntheticFlag = 2 /* SyntheticProperty */;
                         }
                     }
                     else if (isUnion) {
-                        checkFlags |= 16;
+                        checkFlags |= 16 /* Partial */;
                     }
                 }
             }
             if (!props) {
                 return undefined;
             }
-            if (props.length === 1 && !(checkFlags & 16)) {
+            if (props.length === 1 && !(checkFlags & 16 /* Partial */)) {
                 return props[0];
             }
             var declarations;
@@ -27043,12 +35431,12 @@ var ts;
                 }
                 else {
                     if (type !== commonType) {
-                        checkFlags |= 32;
+                        checkFlags |= 32 /* HasNonUniformType */;
                     }
                 }
                 propTypes.push(type);
             }
-            var result = createSymbol(4 | commonFlags, name, syntheticFlag | checkFlags);
+            var result = createSymbol(4 /* Property */ | commonFlags, name, syntheticFlag | checkFlags);
             result.containingType = containingType;
             if (!hasNonUniformValueDeclaration && commonValueDeclaration) {
                 result.valueDeclaration = commonValueDeclaration;
@@ -27058,6 +35446,11 @@ var ts;
             result.type = isUnion ? getUnionType(propTypes) : getIntersectionType(propTypes);
             return result;
         }
+        // Return the symbol for a given property in a union or intersection type, or undefined if the property
+        // does not exist in any constituent type. Note that the returned property may only be present in some
+        // constituents, in which case the isPartial flag is set when the containing type is union type. We need
+        // these partial properties when identifying discriminant properties, but otherwise they are filtered out
+        // and do not appear to be present in the union type.
         function getUnionOrIntersectionProperty(type, name) {
             var properties = type.propertyCache || (type.propertyCache = ts.createSymbolTable());
             var property = properties.get(name);
@@ -27071,11 +35464,20 @@ var ts;
         }
         function getPropertyOfUnionOrIntersectionType(type, name) {
             var property = getUnionOrIntersectionProperty(type, name);
-            return property && !(ts.getCheckFlags(property) & 16) ? property : undefined;
+            // We need to filter out partial properties in union types
+            return property && !(ts.getCheckFlags(property) & 16 /* Partial */) ? property : undefined;
         }
+        /**
+         * Return the symbol for the property with the given name in the given type. Creates synthetic union properties when
+         * necessary, maps primitive types and type parameters are to their apparent types, and augments with properties from
+         * Object and Function as appropriate.
+         *
+         * @param type a type to look up property from
+         * @param name a name of property to look up in a given type
+         */
         function getPropertyOfType(type, name) {
             type = getApparentType(type);
-            if (type.flags & 131072) {
+            if (type.flags & 131072 /* Object */) {
                 var resolved = resolveStructuredTypeMembers(type);
                 var symbol = resolved.members.get(name);
                 if (symbol && symbolIsValue(symbol)) {
@@ -27089,34 +35491,42 @@ var ts;
                 }
                 return getPropertyOfObjectType(globalObjectType, name);
             }
-            if (type.flags & 786432) {
+            if (type.flags & 786432 /* UnionOrIntersection */) {
                 return getPropertyOfUnionOrIntersectionType(type, name);
             }
             return undefined;
         }
         function getSignaturesOfStructuredType(type, kind) {
-            if (type.flags & 917504) {
+            if (type.flags & 917504 /* StructuredType */) {
                 var resolved = resolveStructuredTypeMembers(type);
-                return kind === 0 ? resolved.callSignatures : resolved.constructSignatures;
+                return kind === 0 /* Call */ ? resolved.callSignatures : resolved.constructSignatures;
             }
             return ts.emptyArray;
         }
+        /**
+         * Return the signatures of the given kind in the given type. Creates synthetic union signatures when necessary and
+         * maps primitive types and type parameters are to their apparent types.
+         */
         function getSignaturesOfType(type, kind) {
             return getSignaturesOfStructuredType(getApparentType(type), kind);
         }
         function getIndexInfoOfStructuredType(type, kind) {
-            if (type.flags & 917504) {
+            if (type.flags & 917504 /* StructuredType */) {
                 var resolved = resolveStructuredTypeMembers(type);
-                return kind === 0 ? resolved.stringIndexInfo : resolved.numberIndexInfo;
+                return kind === 0 /* String */ ? resolved.stringIndexInfo : resolved.numberIndexInfo;
             }
         }
         function getIndexTypeOfStructuredType(type, kind) {
             var info = getIndexInfoOfStructuredType(type, kind);
             return info && info.type;
         }
+        // Return the indexing info of the given kind in the given type. Creates synthetic union index types when necessary and
+        // maps primitive types and type parameters are to their apparent types.
         function getIndexInfoOfType(type, kind) {
             return getIndexInfoOfStructuredType(getApparentType(type), kind);
         }
+        // Return the index type of the given kind in the given type. Creates synthetic union index types when necessary and
+        // maps primitive types and type parameters are to their apparent types.
         function getIndexTypeOfType(type, kind) {
             return getIndexTypeOfStructuredType(getApparentType(type), kind);
         }
@@ -27125,16 +35535,18 @@ var ts;
                 var propTypes = [];
                 for (var _i = 0, _a = getPropertiesOfType(type); _i < _a.length; _i++) {
                     var prop = _a[_i];
-                    if (kind === 0 || isNumericLiteralName(prop.escapedName)) {
+                    if (kind === 0 /* String */ || isNumericLiteralName(prop.escapedName)) {
                         propTypes.push(getTypeOfSymbol(prop));
                     }
                 }
                 if (propTypes.length) {
-                    return getUnionType(propTypes, 2);
+                    return getUnionType(propTypes, 2 /* Subtype */);
                 }
             }
             return undefined;
         }
+        // Return list of type parameters with duplicates removed (duplicate identifier errors are generated in the actual
+        // type checking functions).
         function getTypeParametersFromDeclaration(declaration) {
             var result;
             for (var _i = 0, _a = ts.getEffectiveTypeParameterDeclarations(declaration); _i < _a.length; _i++) {
@@ -27153,17 +35565,20 @@ var ts;
             return result;
         }
         function isJSDocOptionalParameter(node) {
-            return ts.isInJavaScriptFile(node) && (node.type && node.type.kind === 283
+            return ts.isInJavaScriptFile(node) && (
+            // node.type should only be a JSDocOptionalType when node is a parameter of a JSDocFunctionType
+            node.type && node.type.kind === 283 /* JSDocOptionalType */
                 || ts.getJSDocParameterTags(node).some(function (_a) {
                     var isBracketed = _a.isBracketed, typeExpression = _a.typeExpression;
-                    return isBracketed || !!typeExpression && typeExpression.type.kind === 283;
+                    return isBracketed || !!typeExpression && typeExpression.type.kind === 283 /* JSDocOptionalType */;
                 }));
         }
         function tryFindAmbientModule(moduleName, withAugmentations) {
             if (ts.isExternalModuleNameRelative(moduleName)) {
                 return undefined;
             }
-            var symbol = getSymbol(globals, '"' + moduleName + '"', 512);
+            var symbol = getSymbol(globals, '"' + moduleName + '"', 512 /* ValueModule */);
+            // merged symbol is module declaration symbol combined with all augmentations
             return symbol && withAugmentations ? getMergedSymbol(symbol) : symbol;
         }
         function isOptionalParameter(node) {
@@ -27189,24 +35604,29 @@ var ts;
                 return false;
             }
             var isBracketed = node.isBracketed, typeExpression = node.typeExpression;
-            return isBracketed || !!typeExpression && typeExpression.type.kind === 283;
+            return isBracketed || !!typeExpression && typeExpression.type.kind === 283 /* JSDocOptionalType */;
         }
         function createTypePredicateFromTypePredicateNode(node) {
             var parameterName = node.parameterName;
             var type = getTypeFromTypeNode(node.type);
-            if (parameterName.kind === 71) {
-                return createIdentifierTypePredicate(parameterName && parameterName.escapedText, parameterName && getTypePredicateParameterIndex(node.parent.parameters, parameterName), type);
+            if (parameterName.kind === 71 /* Identifier */) {
+                return createIdentifierTypePredicate(parameterName && parameterName.escapedText, // TODO: GH#18217
+                parameterName && getTypePredicateParameterIndex(node.parent.parameters, parameterName), type);
             }
             else {
                 return createThisTypePredicate(type);
             }
         }
         function createIdentifierTypePredicate(parameterName, parameterIndex, type) {
-            return { kind: 1, parameterName: parameterName, parameterIndex: parameterIndex, type: type };
+            return { kind: 1 /* Identifier */, parameterName: parameterName, parameterIndex: parameterIndex, type: type };
         }
         function createThisTypePredicate(type) {
-            return { kind: 0, type: type };
+            return { kind: 0 /* This */, type: type };
         }
+        /**
+         * Gets the minimum number of type arguments needed to satisfy all non-optional type
+         * parameters.
+         */
         function getMinTypeArgumentCount(typeParameters) {
             var minTypeArgumentCount = 0;
             if (typeParameters) {
@@ -27226,6 +35646,9 @@ var ts;
                     if (!typeArguments) {
                         typeArguments = [];
                     }
+                    // Map an unsatisfied type parameter with a default type.
+                    // If a type parameter does not have a default type, or if the default type
+                    // is a forward reference, the empty object type is used.
                     for (var i = numTypeArguments; i < numTypeParameters; i++) {
                         typeArguments[i] = getDefaultTypeArgumentType(isJavaScriptImplicitAny);
                     }
@@ -27257,12 +35680,16 @@ var ts;
                     ts.isValueSignatureDeclaration(declaration) &&
                     !ts.hasJSDocParameterTags(declaration) &&
                     !ts.getJSDocType(declaration);
+                // If this is a JSDoc construct signature, then skip the first parameter in the
+                // parameter list.  The first parameter represents the return type of the construct
+                // signature.
                 for (var i = isJSConstructSignature ? 1 : 0; i < declaration.parameters.length; i++) {
                     var param = declaration.parameters[i];
                     var paramSymbol = param.symbol;
                     var type = ts.isJSDocParameterTag(param) ? (param.typeExpression && param.typeExpression.type) : param.type;
-                    if (paramSymbol && !!(paramSymbol.flags & 4) && !ts.isBindingPattern(param.name)) {
-                        var resolvedSymbol = resolveName(param, paramSymbol.escapedName, 67216319, undefined, undefined, false);
+                    // Include parameter symbol instead of property symbol in the signature
+                    if (paramSymbol && !!(paramSymbol.flags & 4 /* Property */) && !ts.isBindingPattern(param.name)) {
+                        var resolvedSymbol = resolveName(param, paramSymbol.escapedName, 67216319 /* Value */, undefined, undefined, /*isUse*/ false);
                         paramSymbol = resolvedSymbol;
                     }
                     if (i === 0 && paramSymbol.escapedName === "this") {
@@ -27272,9 +35699,10 @@ var ts;
                     else {
                         parameters.push(paramSymbol);
                     }
-                    if (type && type.kind === 178) {
+                    if (type && type.kind === 178 /* LiteralType */) {
                         hasLiteralTypes = true;
                     }
+                    // Record a new minimum argument count if this is not an optional parameter
                     var isOptionalParameter_1 = isOptionalJSDocParameterTag(param) ||
                         param.initializer || param.questionToken || param.dotDotDotToken ||
                         iife && parameters.length > iife.arguments.length && !type ||
@@ -27284,25 +35712,32 @@ var ts;
                         minArgumentCount = parameters.length;
                     }
                 }
-                if ((declaration.kind === 156 || declaration.kind === 157) &&
+                // If only one accessor includes a this-type annotation, the other behaves as if it had the same type annotation
+                if ((declaration.kind === 156 /* GetAccessor */ || declaration.kind === 157 /* SetAccessor */) &&
                     !hasNonBindableDynamicName(declaration) &&
                     (!hasThisParameter || !thisParameter)) {
-                    var otherKind = declaration.kind === 156 ? 157 : 156;
+                    var otherKind = declaration.kind === 156 /* GetAccessor */ ? 157 /* SetAccessor */ : 156 /* GetAccessor */;
                     var other = ts.getDeclarationOfKind(getSymbolOfNode(declaration), otherKind);
                     if (other) {
                         thisParameter = getAnnotatedAccessorThisParameter(other);
                     }
                 }
-                var classType = declaration.kind === 155 ?
+                var classType = declaration.kind === 155 /* Constructor */ ?
                     getDeclaredTypeOfClassOrInterface(getMergedSymbol(declaration.parent.symbol))
                     : undefined;
                 var typeParameters = classType ? classType.localTypeParameters : getTypeParametersFromDeclaration(declaration);
                 var returnType = getSignatureReturnTypeFromDeclaration(declaration, isJSConstructSignature, classType);
                 var hasRestLikeParameter = ts.hasRestParameter(declaration) || ts.isInJavaScriptFile(declaration) && maybeAddJsSyntheticRestParameter(declaration, parameters);
-                links.resolvedSignature = createSignature(declaration, typeParameters, thisParameter, parameters, returnType, undefined, minArgumentCount, hasRestLikeParameter, hasLiteralTypes);
+                links.resolvedSignature = createSignature(declaration, typeParameters, thisParameter, parameters, returnType, /*resolvedTypePredicate*/ undefined, minArgumentCount, hasRestLikeParameter, hasLiteralTypes);
             }
             return links.resolvedSignature;
         }
+        /**
+         * A JS function gets a synthetic rest parameter if it references `arguments` AND:
+         * 1. It has no parameters but at least one `@param` with a type that starts with `...`
+         * OR
+         * 2. It has at least one parameter, and the last parameter has a matching `@param` with a type that starts with `...`
+         */
         function maybeAddJsSyntheticRestParameter(declaration, parameters) {
             if (ts.isJSDocSignature(declaration) || !containsArgumentsReference(declaration)) {
                 return false;
@@ -27312,10 +35747,11 @@ var ts;
             var lastParamVariadicType = ts.firstDefined(lastParamTags, function (p) {
                 return p.typeExpression && ts.isJSDocVariadicType(p.typeExpression.type) ? p.typeExpression.type : undefined;
             });
-            var syntheticArgsSymbol = createSymbol(3, "args");
+            var syntheticArgsSymbol = createSymbol(3 /* Variable */, "args");
             syntheticArgsSymbol.type = lastParamVariadicType ? createArrayType(getTypeFromTypeNode(lastParamVariadicType.type)) : anyArrayType;
             syntheticArgsSymbol.isRestParameter = true;
             if (lastParamVariadicType) {
+                // Replace the last parameter with a rest parameter.
                 parameters.pop();
             }
             parameters.push(syntheticArgsSymbol);
@@ -27323,7 +35759,7 @@ var ts;
         }
         function getSignatureReturnTypeFromDeclaration(declaration, isJSConstructSignature, classType) {
             if (isJSConstructSignature) {
-                return getTypeFromTypeNode(declaration.parameters[0].type);
+                return getTypeFromTypeNode(declaration.parameters[0].type); // TODO: GH#18217
             }
             else if (classType) {
                 return classType;
@@ -27332,8 +35768,10 @@ var ts;
             if (typeNode) {
                 return getTypeFromTypeNode(typeNode);
             }
-            if (declaration.kind === 156 && !hasNonBindableDynamicName(declaration)) {
-                var setter = ts.getDeclarationOfKind(getSymbolOfNode(declaration), 157);
+            // TypeScript 1.0 spec (April 2014):
+            // If only one accessor includes a type annotation, the other behaves as if it had the same type annotation.
+            if (declaration.kind === 156 /* GetAccessor */ && !hasNonBindableDynamicName(declaration)) {
+                var setter = ts.getDeclarationOfKind(getSymbolOfNode(declaration), 157 /* SetAccessor */);
                 return getAnnotatedAccessorType(setter);
             }
             if (ts.nodeIsMissing(declaration.body)) {
@@ -27343,7 +35781,7 @@ var ts;
         function containsArgumentsReference(declaration) {
             var links = getNodeLinks(declaration);
             if (links.containsArgumentsReference === undefined) {
-                if (links.flags & 8192) {
+                if (links.flags & 8192 /* CaptureArguments */) {
                     links.containsArgumentsReference = true;
                 }
                 else {
@@ -27355,13 +35793,13 @@ var ts;
                 if (!node)
                     return false;
                 switch (node.kind) {
-                    case 71:
+                    case 71 /* Identifier */:
                         return node.escapedText === "arguments" && ts.isExpressionNode(node);
-                    case 152:
-                    case 154:
-                    case 156:
-                    case 157:
-                        return node.name.kind === 147
+                    case 152 /* PropertyDeclaration */:
+                    case 154 /* MethodDeclaration */:
+                    case 156 /* GetAccessor */:
+                    case 157 /* SetAccessor */:
+                        return node.name.kind === 147 /* ComputedPropertyName */
                             && traverse(node.name);
                     default:
                         return !ts.nodeStartsNewLexicalEnvironment(node) && !ts.isPartOfTypeNode(node) && !!ts.forEachChild(node, traverse);
@@ -27376,6 +35814,9 @@ var ts;
                 var decl = symbol.declarations[i];
                 if (!ts.isFunctionLike(decl))
                     continue;
+                // Don't include signature if node is the implementation of an overloaded function. A node is considered
+                // an implementation node if it has a body and the previous node is of the same kind and immediately
+                // precedes the implementation node (i.e. has the same parent and ends where the implementation starts).
                 if (i > 0 && decl.body) {
                     var previous = symbol.declarations[i - 1];
                     if (decl.parent === previous.parent && decl.kind === previous.kind && decl.pos === previous.end) {
@@ -27415,7 +35856,7 @@ var ts;
                 }
                 else {
                     var declaration = signature.declaration;
-                    signature.resolvedTypePredicate = declaration && declaration.type && declaration.type.kind === 161 ?
+                    signature.resolvedTypePredicate = declaration && declaration.type && declaration.type.kind === 161 /* TypePredicate */ ?
                         createTypePredicateFromTypePredicateNode(declaration.type) :
                         noTypePredicate;
                 }
@@ -27425,7 +35866,7 @@ var ts;
         }
         function getReturnTypeOfSignature(signature) {
             if (!signature.resolvedReturnType) {
-                if (!pushTypeResolution(signature, 3)) {
+                if (!pushTypeResolution(signature, 3 /* ResolvedReturnType */)) {
                     return errorType;
                 }
                 var type = void 0;
@@ -27433,7 +35874,7 @@ var ts;
                     type = instantiateType(getReturnTypeOfSignature(signature.target), signature.mapper);
                 }
                 else if (signature.unionSignatures) {
-                    type = getUnionType(ts.map(signature.unionSignatures, getReturnTypeOfSignature), 2);
+                    type = getUnionType(ts.map(signature.unionSignatures, getReturnTypeOfSignature), 2 /* Subtype */);
                 }
                 else {
                     type = getReturnTypeFromBody(signature.declaration);
@@ -27456,12 +35897,12 @@ var ts;
             return signature.resolvedReturnType;
         }
         function isResolvingReturnTypeOfSignature(signature) {
-            return !signature.resolvedReturnType && findResolutionCycleStartIndex(signature, 3) >= 0;
+            return !signature.resolvedReturnType && findResolutionCycleStartIndex(signature, 3 /* ResolvedReturnType */) >= 0;
         }
         function getRestTypeOfSignature(signature) {
             if (signature.hasRestParameter) {
                 var type = getTypeOfSymbol(ts.last(signature.parameters));
-                if (ts.getObjectFlags(type) & 4 && type.target === globalArrayType) {
+                if (ts.getObjectFlags(type) & 4 /* Reference */ && type.target === globalArrayType) {
                     return type.typeArguments[0];
                 }
             }
@@ -27478,7 +35919,7 @@ var ts;
             return instantiation;
         }
         function createSignatureInstantiation(signature, typeArguments) {
-            return instantiateSignature(signature, createSignatureTypeMapper(signature, typeArguments), true);
+            return instantiateSignature(signature, createSignatureTypeMapper(signature, typeArguments), /*eraseTypeParameters*/ true);
         }
         function createSignatureTypeMapper(signature, typeArguments) {
             return createTypeMapper(signature.typeParameters, typeArguments);
@@ -27489,7 +35930,8 @@ var ts;
                 signature;
         }
         function createErasedSignature(signature) {
-            return instantiateSignature(signature, createTypeEraser(signature.typeParameters), true);
+            // Create an instantiation of the signature where all type arguments are the any type.
+            return instantiateSignature(signature, createTypeEraser(signature.typeParameters), /*eraseTypeParameters*/ true);
         }
         function getCanonicalSignature(signature) {
             return signature.typeParameters ?
@@ -27497,6 +35939,12 @@ var ts;
                 signature;
         }
         function createCanonicalSignature(signature) {
+            // Create an instantiation of the signature where each unconstrained type parameter is replaced with
+            // its original. When a generic class or interface is instantiated, each generic method in the class or
+            // interface is instantiated with a fresh set of cloned type parameters (which we need to handle scenarios
+            // where different generations of the same type parameter are in scope). This leads to a lot of new type
+            // identities, and potentially a lot of work comparing those identities, so here we create an instantiation
+            // that uses the original type identities for all unconstrained type parameters.
             return getSignatureInstantiation(signature, ts.map(signature.typeParameters, function (tp) { return tp.target && !getConstraintOfTypeParameter(tp.target) ? tp.target : tp; }), ts.isInJavaScriptFile(signature.declaration));
         }
         function getBaseSignature(signature) {
@@ -27504,14 +35952,18 @@ var ts;
             if (typeParameters) {
                 var typeEraser_1 = createTypeEraser(typeParameters);
                 var baseConstraints = ts.map(typeParameters, function (tp) { return instantiateType(getBaseConstraintOfType(tp), typeEraser_1) || emptyObjectType; });
-                return instantiateSignature(signature, createTypeMapper(typeParameters, baseConstraints), true);
+                return instantiateSignature(signature, createTypeMapper(typeParameters, baseConstraints), /*eraseTypeParameters*/ true);
             }
             return signature;
         }
         function getOrCreateTypeFromSignature(signature) {
+            // There are two ways to declare a construct signature, one is by declaring a class constructor
+            // using the constructor keyword, and the other is declaring a bare construct signature in an
+            // object type literal or interface (using the new keyword). Each way of declaring a constructor
+            // will result in a different declaration kind.
             if (!signature.isolatedSignatureType) {
-                var isConstructor = signature.declaration.kind === 155 || signature.declaration.kind === 159;
-                var type = createObjectType(16);
+                var isConstructor = signature.declaration.kind === 155 /* Constructor */ || signature.declaration.kind === 159 /* ConstructSignature */; // TODO: GH#18217
+                var type = createObjectType(16 /* Anonymous */);
                 type.members = emptySymbols;
                 type.properties = ts.emptyArray;
                 type.callSignatures = !isConstructor ? [signature] : ts.emptyArray;
@@ -27521,10 +35973,10 @@ var ts;
             return signature.isolatedSignatureType;
         }
         function getIndexSymbol(symbol) {
-            return symbol.members.get("__index");
+            return symbol.members.get("__index" /* Index */);
         }
         function getIndexDeclarationOfSymbol(symbol, kind) {
-            var syntaxKind = kind === 1 ? 134 : 137;
+            var syntaxKind = kind === 1 /* Number */ ? 134 /* NumberKeyword */ : 137 /* StringKeyword */;
             var indexSymbol = getIndexSymbol(symbol);
             if (indexSymbol) {
                 for (var _i = 0, _a = indexSymbol.declarations; _i < _a.length; _i++) {
@@ -27546,12 +35998,12 @@ var ts;
         function getIndexInfoOfSymbol(symbol, kind) {
             var declaration = getIndexDeclarationOfSymbol(symbol, kind);
             if (declaration) {
-                return createIndexInfo(declaration.type ? getTypeFromTypeNode(declaration.type) : anyType, ts.hasModifier(declaration, 64), declaration);
+                return createIndexInfo(declaration.type ? getTypeFromTypeNode(declaration.type) : anyType, ts.hasModifier(declaration, 64 /* Readonly */), declaration);
             }
             return undefined;
         }
         function getConstraintDeclaration(type) {
-            var decl = type.symbol && ts.getDeclarationOfKind(type.symbol, 148);
+            var decl = type.symbol && ts.getDeclarationOfKind(type.symbol, 148 /* TypeParameter */);
             return decl && decl.constraint;
         }
         function getInferredTypeParameterConstraint(typeParameter) {
@@ -27559,7 +36011,11 @@ var ts;
             if (typeParameter.symbol) {
                 for (var _i = 0, _a = typeParameter.symbol.declarations; _i < _a.length; _i++) {
                     var declaration = _a[_i];
-                    if (declaration.parent.kind === 172 && declaration.parent.parent.kind === 162) {
+                    // When an 'infer T' declaration is immediately contained in a type reference node
+                    // (such as 'Foo<infer T>'), T's constraint is inferred from the constraint of the
+                    // corresponding type parameter in 'Foo'. When multiple 'infer T' declarations are
+                    // present, we form an intersection of the inferred constraint types.
+                    if (declaration.parent.kind === 172 /* InferType */ && declaration.parent.parent.kind === 162 /* TypeReference */) {
                         var typeReference = declaration.parent.parent;
                         var typeParameters = getTypeParametersForTypeReference(typeReference);
                         if (typeParameters) {
@@ -27567,6 +36023,12 @@ var ts;
                             if (index < typeParameters.length) {
                                 var declaredConstraint = getConstraintOfTypeParameter(typeParameters[index]);
                                 if (declaredConstraint) {
+                                    // Type parameter constraints can reference other type parameters so
+                                    // constraints need to be instantiated. If instantiation produces the
+                                    // type parameter itself, we discard that inference. For example, in
+                                    //   type Foo<T extends string, U extends T> = [T, U];
+                                    //   type Bar<T> = T extends Foo<infer X, infer X> ? Foo<X, X> : T;
+                                    // the instantiated constraint for U is X, so we discard that inference.
                                     var mapper = createTypeMapper(typeParameters, getEffectiveTypeArguments(typeReference, typeParameters));
                                     var constraint = instantiateType(declaredConstraint, mapper);
                                     if (constraint !== typeParameter) {
@@ -27595,7 +36057,7 @@ var ts;
             return typeParameter.constraint === noConstraintType ? undefined : typeParameter.constraint;
         }
         function getParentSymbolOfTypeParameter(typeParameter) {
-            return getSymbolOfNode(ts.getDeclarationOfKind(typeParameter.symbol, 148).parent);
+            return getSymbolOfNode(ts.getDeclarationOfKind(typeParameter.symbol, 148 /* TypeParameter */).parent);
         }
         function getTypeListId(types) {
             var result = "";
@@ -27620,6 +36082,10 @@ var ts;
             }
             return result;
         }
+        // This function is used to propagate certain flags when creating new object type references and union types.
+        // It is only necessary to do so if a constituent type might be the undefined type, the null type, the type
+        // of an object literal or the anyFunctionType. This is because there are operations in the type checker
+        // that care about the presence of such types at arbitrary depth in a containing type.
         function getPropagatingFlagsOfTypes(types, excludeKinds) {
             var result = 0;
             for (var _i = 0, types_5 = types; _i < types_5.length; _i++) {
@@ -27628,15 +36094,15 @@ var ts;
                     result |= type.flags;
                 }
             }
-            return result & 939524096;
+            return result & 939524096 /* PropagatingFlags */;
         }
         function createTypeReference(target, typeArguments) {
             var id = getTypeListId(typeArguments);
             var type = target.instantiations.get(id);
             if (!type) {
-                type = createObjectType(4, target.symbol);
+                type = createObjectType(4 /* Reference */, target.symbol);
                 target.instantiations.set(id, type);
-                type.flags |= typeArguments ? getPropagatingFlagsOfTypes(typeArguments, 0) : 0;
+                type.flags |= typeArguments ? getPropagatingFlagsOfTypes(typeArguments, /*excludeKinds*/ 0) : 0;
                 type.target = target;
                 type.typeArguments = typeArguments;
             }
@@ -27653,6 +36119,9 @@ var ts;
         function getTypeReferenceArity(type) {
             return ts.length(type.target.typeParameters);
         }
+        /**
+         * Get type from type-reference that reference to class or interface
+         */
         function getTypeFromClassOrInterfaceReference(node, symbol, typeArgs) {
             var type = getDeclaredTypeOfSymbol(getMergedSymbol(symbol));
             var typeParameters = type.localTypeParameters;
@@ -27662,7 +36131,7 @@ var ts;
                 var isJs = ts.isInJavaScriptFile(node);
                 var isJsImplicitAny = !noImplicitAny && isJs;
                 if (!isJsImplicitAny && (numTypeArguments < minTypeArgumentCount || numTypeArguments > typeParameters.length)) {
-                    var missingAugmentsTag = isJs && node.parent.kind !== 290;
+                    var missingAugmentsTag = isJs && node.parent.kind !== 290 /* JSDocAugmentsTag */;
                     var diag = minTypeArgumentCount === typeParameters.length
                         ? missingAugmentsTag
                             ? ts.Diagnostics.Expected_0_type_arguments_provide_these_with_an_extends_tag
@@ -27670,12 +36139,16 @@ var ts;
                         : missingAugmentsTag
                             ? ts.Diagnostics.Expected_0_1_type_arguments_provide_these_with_an_extends_tag
                             : ts.Diagnostics.Generic_type_0_requires_between_1_and_2_type_arguments;
-                    var typeStr = typeToString(type, undefined, 2);
+                    var typeStr = typeToString(type, /*enclosingDeclaration*/ undefined, 2 /* WriteArrayAsGenericType */);
                     error(node, diag, typeStr, minTypeArgumentCount, typeParameters.length);
                     if (!isJs) {
+                        // TODO: Adopt same permissive behavior in TS as in JS to reduce follow-on editing experience failures (requires editing fillMissingTypeArguments)
                         return errorType;
                     }
                 }
+                // In a type reference, the outer type parameters of the referenced class or interface are automatically
+                // supplied as type arguments and the type reference only specifies arguments for the local type parameters
+                // of the class or interface.
                 var typeArguments = ts.concatenate(type.outerTypeParameters, fillMissingTypeArguments(typeArgs, typeParameters, minTypeArgumentCount, isJs));
                 return createTypeReference(type, typeArguments);
             }
@@ -27692,6 +36165,11 @@ var ts;
             }
             return instantiation;
         }
+        /**
+         * Get type from reference to type alias. When a type alias is generic, the declared type of the type alias may include
+         * references to the type parameters of the alias. We replace those with the actual type arguments by instantiating the
+         * declared type. Instantiations are cached using the type identities of the type arguments as the key.
+         */
         function getTypeFromTypeAliasReference(node, symbol, typeArguments) {
             var type = getDeclaredTypeOfSymbol(symbol);
             var typeParameters = getSymbolLinks(symbol).typeParameters;
@@ -27710,13 +36188,16 @@ var ts;
         }
         function getTypeReferenceName(node) {
             switch (node.kind) {
-                case 162:
+                case 162 /* TypeReference */:
                     return node.typeName;
-                case 207:
+                case 207 /* ExpressionWithTypeArguments */:
+                    // We only support expressions that are simple qualified names. For other
+                    // expressions this produces undefined.
                     var expr = node.expression;
                     if (ts.isEntityNameExpression(expr)) {
                         return expr;
                     }
+                // fall through;
             }
             return undefined;
         }
@@ -27727,7 +36208,7 @@ var ts;
             return resolveEntityName(typeReferenceName, meaning) || unknownSymbol;
         }
         function getTypeReferenceType(node, symbol) {
-            var typeArguments = typeArgumentsFromTypeReferenceNode(node);
+            var typeArguments = typeArgumentsFromTypeReferenceNode(node); // Do unconditionally so we mark type arguments as referenced.
             if (symbol === unknownSymbol) {
                 return errorType;
             }
@@ -27735,32 +36216,40 @@ var ts;
             if (type) {
                 return type;
             }
+            // Get type from reference to named type that cannot be generic (enum or type parameter)
             var res = tryGetDeclaredTypeOfSymbol(symbol);
             if (res) {
                 return checkNoTypeArguments(node, symbol) ?
-                    res.flags & 65536 ? getConstrainedTypeVariable(res, node) : res :
+                    res.flags & 65536 /* TypeParameter */ ? getConstrainedTypeVariable(res, node) : res :
                     errorType;
             }
-            if (!(symbol.flags & 67216319 && isJSDocTypeReference(node))) {
+            if (!(symbol.flags & 67216319 /* Value */ && isJSDocTypeReference(node))) {
                 return errorType;
             }
             var jsdocType = getJSDocTypeReference(node, symbol, typeArguments);
             if (jsdocType) {
                 return jsdocType;
             }
-            resolveTypeReferenceName(getTypeReferenceName(node), 67901928);
+            // Resolve the type reference as a Type for the purpose of reporting errors.
+            resolveTypeReferenceName(getTypeReferenceName(node), 67901928 /* Type */);
             return getTypeOfSymbol(symbol);
         }
+        /**
+         * A jsdoc TypeReference may have resolved to a value (as opposed to a type). If
+         * the symbol is a constructor function, return the inferred class type; otherwise,
+         * the type of this reference is just the type of the value we resolved to.
+         */
         function getJSDocTypeReference(node, symbol, typeArguments) {
             var assignedType = getAssignedClassType(symbol);
             var valueType = getTypeOfSymbol(symbol);
             var referenceType = valueType.symbol && valueType.symbol !== symbol && !isInferredClassType(valueType) && getTypeReferenceTypeWorker(node, valueType.symbol, typeArguments);
             if (referenceType || assignedType) {
+                // TODO: GH#18217 (should the `|| assignedType` be at a lower precedence?)
                 return (referenceType && assignedType ? getIntersectionType([assignedType, referenceType]) : referenceType || assignedType);
             }
         }
         function getTypeReferenceTypeWorker(node, symbol, typeArguments) {
-            if (symbol.flags & (32 | 64)) {
+            if (symbol.flags & (32 /* Class */ | 64 /* Interface */)) {
                 if (symbol.valueDeclaration && ts.isBinaryExpression(symbol.valueDeclaration.parent)) {
                     var jsdocType = getJSDocTypeReference(node, symbol, typeArguments);
                     if (jsdocType) {
@@ -27769,23 +36258,23 @@ var ts;
                 }
                 return getTypeFromClassOrInterfaceReference(node, symbol, typeArguments);
             }
-            if (symbol.flags & 524288) {
+            if (symbol.flags & 524288 /* TypeAlias */) {
                 return getTypeFromTypeAliasReference(node, symbol, typeArguments);
             }
-            if (symbol.flags & 16 &&
+            if (symbol.flags & 16 /* Function */ &&
                 isJSDocTypeReference(node) &&
                 (symbol.members || ts.getJSDocClassTag(symbol.valueDeclaration))) {
                 return getInferredClassType(symbol);
             }
         }
         function getSubstitutionType(typeVariable, substitute) {
-            var result = createType(8388608);
+            var result = createType(8388608 /* Substitution */);
             result.typeVariable = typeVariable;
             result.substitute = substitute;
             return result;
         }
         function isUnaryTupleTypeNode(node) {
-            return node.kind === 168 && node.elementTypes.length === 1;
+            return node.kind === 168 /* TupleType */ && node.elementTypes.length === 1;
         }
         function getImpliedConstraint(typeVariable, checkNode, extendsNode) {
             return isUnaryTupleTypeNode(checkNode) && isUnaryTupleTypeNode(extendsNode) ? getImpliedConstraint(typeVariable, checkNode.elementTypes[0], extendsNode.elementTypes[0]) :
@@ -27794,9 +36283,9 @@ var ts;
         }
         function getConstrainedTypeVariable(typeVariable, node) {
             var constraints;
-            while (node && !ts.isStatement(node) && node.kind !== 286) {
+            while (node && !ts.isStatement(node) && node.kind !== 286 /* JSDocComment */) {
                 var parent = node.parent;
-                if (parent.kind === 171 && node === parent.trueType) {
+                if (parent.kind === 171 /* ConditionalType */ && node === parent.trueType) {
                     var constraint = getImpliedConstraint(typeVariable, parent.checkType, parent.extendsType);
                     if (constraint) {
                         constraints = ts.append(constraints, constraint);
@@ -27807,7 +36296,7 @@ var ts;
             return constraints ? getSubstitutionType(typeVariable, getIntersectionType(ts.append(constraints, typeVariable))) : typeVariable;
         }
         function isJSDocTypeReference(node) {
-            return !!(node.flags & 2097152) && node.kind === 162;
+            return !!(node.flags & 2097152 /* JSDoc */) && node.kind === 162 /* TypeReference */;
         }
         function checkNoTypeArguments(node, symbol) {
             if (node.typeArguments) {
@@ -27853,7 +36342,7 @@ var ts;
                             if (ts.isJSDocIndexSignature(node)) {
                                 var indexed = getTypeFromTypeNode(typeArgs[0]);
                                 var target = getTypeFromTypeNode(typeArgs[1]);
-                                var index = createIndexInfo(target, false);
+                                var index = createIndexInfo(target, /*isReadonly*/ false);
                                 return createAnonymousType(undefined, emptySymbols, ts.emptyArray, ts.emptyArray, indexed === stringType ? index : undefined, indexed === numberType ? index : undefined);
                             }
                             return anyType;
@@ -27865,22 +36354,24 @@ var ts;
         }
         function getTypeFromJSDocNullableTypeNode(node) {
             var type = getTypeFromTypeNode(node.type);
-            return strictNullChecks ? getNullableType(type, 16384) : type;
+            return strictNullChecks ? getNullableType(type, 16384 /* Null */) : type;
         }
         function getTypeFromTypeReference(node) {
             var links = getNodeLinks(node);
             if (!links.resolvedType) {
                 var symbol = void 0;
                 var type = void 0;
-                var meaning = 67901928;
+                var meaning = 67901928 /* Type */;
                 if (isJSDocTypeReference(node)) {
                     type = getIntendedTypeFromJSDocTypeReference(node);
-                    meaning |= 67216319;
+                    meaning |= 67216319 /* Value */;
                 }
                 if (!type) {
                     symbol = resolveTypeReferenceName(getTypeReferenceName(node), meaning);
                     type = getTypeReferenceType(node, symbol);
                 }
+                // Cache both the resolved symbol and the resolved type. The resolved symbol is needed in when we check the
+                // type reference in checkTypeReferenceNode.
                 links.resolvedSymbol = symbol;
                 links.resolvedType = type;
             }
@@ -27892,6 +36383,10 @@ var ts;
         function getTypeFromTypeQueryNode(node) {
             var links = getNodeLinks(node);
             if (!links.resolvedType) {
+                // TypeScript 1.0 spec (April 2014): 3.6.3
+                // The expression is processed as an identifier expression (section 4.3)
+                // or property access expression(section 4.10),
+                // the widened type(section 3.9) of which becomes the result.
                 links.resolvedType = getWidenedType(checkExpression(node.exprName));
             }
             return links.resolvedType;
@@ -27899,12 +36394,12 @@ var ts;
         function getTypeOfGlobalSymbol(symbol, arity) {
             function getTypeDeclaration(symbol) {
                 var declarations = symbol.declarations;
-                for (var _i = 0, declarations_3 = declarations; _i < declarations_3.length; _i++) {
-                    var declaration = declarations_3[_i];
+                for (var _i = 0, declarations_2 = declarations; _i < declarations_2.length; _i++) {
+                    var declaration = declarations_2[_i];
                     switch (declaration.kind) {
-                        case 235:
-                        case 236:
-                        case 238:
+                        case 235 /* ClassDeclaration */:
+                        case 236 /* InterfaceDeclaration */:
+                        case 238 /* EnumDeclaration */:
                             return declaration;
                     }
                 }
@@ -27913,7 +36408,7 @@ var ts;
                 return arity ? emptyGenericType : emptyObjectType;
             }
             var type = getDeclaredTypeOfSymbol(symbol);
-            if (!(type.flags & 131072)) {
+            if (!(type.flags & 131072 /* Object */)) {
                 error(getTypeDeclaration(symbol), ts.Diagnostics.Global_type_0_must_be_a_class_or_interface_type, ts.symbolName(symbol));
                 return arity ? emptyGenericType : emptyObjectType;
             }
@@ -27924,68 +36419,72 @@ var ts;
             return type;
         }
         function getGlobalValueSymbol(name, reportErrors) {
-            return getGlobalSymbol(name, 67216319, reportErrors ? ts.Diagnostics.Cannot_find_global_value_0 : undefined);
+            return getGlobalSymbol(name, 67216319 /* Value */, reportErrors ? ts.Diagnostics.Cannot_find_global_value_0 : undefined);
         }
         function getGlobalTypeSymbol(name, reportErrors) {
-            return getGlobalSymbol(name, 67901928, reportErrors ? ts.Diagnostics.Cannot_find_global_type_0 : undefined);
+            return getGlobalSymbol(name, 67901928 /* Type */, reportErrors ? ts.Diagnostics.Cannot_find_global_type_0 : undefined);
         }
         function getGlobalSymbol(name, meaning, diagnostic) {
-            return resolveName(undefined, name, meaning, diagnostic, name, false);
+            // Don't track references for global symbols anyway, so value if `isReference` is arbitrary
+            return resolveName(undefined, name, meaning, diagnostic, name, /*isUse*/ false);
         }
         function getGlobalType(name, arity, reportErrors) {
             var symbol = getGlobalTypeSymbol(name, reportErrors);
             return symbol || reportErrors ? getTypeOfGlobalSymbol(symbol, arity) : undefined;
         }
         function getGlobalTypedPropertyDescriptorType() {
-            return deferredGlobalTypedPropertyDescriptorType || (deferredGlobalTypedPropertyDescriptorType = getGlobalType("TypedPropertyDescriptor", 1, true)) || emptyGenericType;
+            return deferredGlobalTypedPropertyDescriptorType || (deferredGlobalTypedPropertyDescriptorType = getGlobalType("TypedPropertyDescriptor", /*arity*/ 1, /*reportErrors*/ true)) || emptyGenericType;
         }
         function getGlobalTemplateStringsArrayType() {
-            return deferredGlobalTemplateStringsArrayType || (deferredGlobalTemplateStringsArrayType = getGlobalType("TemplateStringsArray", 0, true)) || emptyObjectType;
+            return deferredGlobalTemplateStringsArrayType || (deferredGlobalTemplateStringsArrayType = getGlobalType("TemplateStringsArray", /*arity*/ 0, /*reportErrors*/ true)) || emptyObjectType;
         }
         function getGlobalImportMetaType() {
-            return deferredGlobalImportMetaType || (deferredGlobalImportMetaType = getGlobalType("ImportMeta", 0, true)) || emptyObjectType;
+            return deferredGlobalImportMetaType || (deferredGlobalImportMetaType = getGlobalType("ImportMeta", /*arity*/ 0, /*reportErrors*/ true)) || emptyObjectType;
         }
         function getGlobalESSymbolConstructorSymbol(reportErrors) {
             return deferredGlobalESSymbolConstructorSymbol || (deferredGlobalESSymbolConstructorSymbol = getGlobalValueSymbol("Symbol", reportErrors));
         }
         function getGlobalESSymbolType(reportErrors) {
-            return deferredGlobalESSymbolType || (deferredGlobalESSymbolType = getGlobalType("Symbol", 0, reportErrors)) || emptyObjectType;
+            return deferredGlobalESSymbolType || (deferredGlobalESSymbolType = getGlobalType("Symbol", /*arity*/ 0, reportErrors)) || emptyObjectType;
         }
         function getGlobalPromiseType(reportErrors) {
-            return deferredGlobalPromiseType || (deferredGlobalPromiseType = getGlobalType("Promise", 1, reportErrors)) || emptyGenericType;
+            return deferredGlobalPromiseType || (deferredGlobalPromiseType = getGlobalType("Promise", /*arity*/ 1, reportErrors)) || emptyGenericType;
         }
         function getGlobalPromiseConstructorSymbol(reportErrors) {
             return deferredGlobalPromiseConstructorSymbol || (deferredGlobalPromiseConstructorSymbol = getGlobalValueSymbol("Promise", reportErrors));
         }
         function getGlobalPromiseConstructorLikeType(reportErrors) {
-            return deferredGlobalPromiseConstructorLikeType || (deferredGlobalPromiseConstructorLikeType = getGlobalType("PromiseConstructorLike", 0, reportErrors)) || emptyObjectType;
+            return deferredGlobalPromiseConstructorLikeType || (deferredGlobalPromiseConstructorLikeType = getGlobalType("PromiseConstructorLike", /*arity*/ 0, reportErrors)) || emptyObjectType;
         }
         function getGlobalAsyncIterableType(reportErrors) {
-            return deferredGlobalAsyncIterableType || (deferredGlobalAsyncIterableType = getGlobalType("AsyncIterable", 1, reportErrors)) || emptyGenericType;
+            return deferredGlobalAsyncIterableType || (deferredGlobalAsyncIterableType = getGlobalType("AsyncIterable", /*arity*/ 1, reportErrors)) || emptyGenericType;
         }
         function getGlobalAsyncIteratorType(reportErrors) {
-            return deferredGlobalAsyncIteratorType || (deferredGlobalAsyncIteratorType = getGlobalType("AsyncIterator", 1, reportErrors)) || emptyGenericType;
+            return deferredGlobalAsyncIteratorType || (deferredGlobalAsyncIteratorType = getGlobalType("AsyncIterator", /*arity*/ 1, reportErrors)) || emptyGenericType;
         }
         function getGlobalAsyncIterableIteratorType(reportErrors) {
-            return deferredGlobalAsyncIterableIteratorType || (deferredGlobalAsyncIterableIteratorType = getGlobalType("AsyncIterableIterator", 1, reportErrors)) || emptyGenericType;
+            return deferredGlobalAsyncIterableIteratorType || (deferredGlobalAsyncIterableIteratorType = getGlobalType("AsyncIterableIterator", /*arity*/ 1, reportErrors)) || emptyGenericType;
         }
         function getGlobalIterableType(reportErrors) {
-            return deferredGlobalIterableType || (deferredGlobalIterableType = getGlobalType("Iterable", 1, reportErrors)) || emptyGenericType;
+            return deferredGlobalIterableType || (deferredGlobalIterableType = getGlobalType("Iterable", /*arity*/ 1, reportErrors)) || emptyGenericType;
         }
         function getGlobalIteratorType(reportErrors) {
-            return deferredGlobalIteratorType || (deferredGlobalIteratorType = getGlobalType("Iterator", 1, reportErrors)) || emptyGenericType;
+            return deferredGlobalIteratorType || (deferredGlobalIteratorType = getGlobalType("Iterator", /*arity*/ 1, reportErrors)) || emptyGenericType;
         }
         function getGlobalIterableIteratorType(reportErrors) {
-            return deferredGlobalIterableIteratorType || (deferredGlobalIterableIteratorType = getGlobalType("IterableIterator", 1, reportErrors)) || emptyGenericType;
+            return deferredGlobalIterableIteratorType || (deferredGlobalIterableIteratorType = getGlobalType("IterableIterator", /*arity*/ 1, reportErrors)) || emptyGenericType;
         }
         function getGlobalTypeOrUndefined(name, arity) {
             if (arity === void 0) { arity = 0; }
-            var symbol = getGlobalSymbol(name, 67901928, undefined);
+            var symbol = getGlobalSymbol(name, 67901928 /* Type */, /*diagnostic*/ undefined);
             return symbol && getTypeOfGlobalSymbol(symbol, arity);
         }
         function getGlobalExtractSymbol() {
-            return deferredGlobalExtractSymbol || (deferredGlobalExtractSymbol = getGlobalSymbol("Extract", 524288, ts.Diagnostics.Cannot_find_global_type_0));
+            return deferredGlobalExtractSymbol || (deferredGlobalExtractSymbol = getGlobalSymbol("Extract", 524288 /* TypeAlias */, ts.Diagnostics.Cannot_find_global_type_0)); // TODO: GH#18217
         }
+        /**
+         * Instantiates a global type that is generic with some element type, and returns that instantiation.
+         */
         function createTypeFromGenericGlobalType(genericGlobalType, typeArguments) {
             return genericGlobalType !== emptyGenericType ? createTypeReference(genericGlobalType, typeArguments) : emptyObjectType;
         }
@@ -27993,16 +36492,16 @@ var ts;
             return createTypeFromGenericGlobalType(getGlobalTypedPropertyDescriptorType(), [propertyType]);
         }
         function createAsyncIterableType(iteratedType) {
-            return createTypeFromGenericGlobalType(getGlobalAsyncIterableType(true), [iteratedType]);
+            return createTypeFromGenericGlobalType(getGlobalAsyncIterableType(/*reportErrors*/ true), [iteratedType]);
         }
         function createAsyncIterableIteratorType(iteratedType) {
-            return createTypeFromGenericGlobalType(getGlobalAsyncIterableIteratorType(true), [iteratedType]);
+            return createTypeFromGenericGlobalType(getGlobalAsyncIterableIteratorType(/*reportErrors*/ true), [iteratedType]);
         }
         function createIterableType(iteratedType) {
-            return createTypeFromGenericGlobalType(getGlobalIterableType(true), [iteratedType]);
+            return createTypeFromGenericGlobalType(getGlobalIterableType(/*reportErrors*/ true), [iteratedType]);
         }
         function createIterableIteratorType(iteratedType) {
-            return createTypeFromGenericGlobalType(getGlobalIterableIteratorType(true), [iteratedType]);
+            return createTypeFromGenericGlobalType(getGlobalIterableIteratorType(/*reportErrors*/ true), [iteratedType]);
         }
         function createArrayType(elementType) {
             return createTypeFromGenericGlobalType(globalArrayType, [elementType]);
@@ -28014,20 +36513,27 @@ var ts;
             }
             return links.resolvedType;
         }
+        // We represent tuple types as type references to synthesized generic interface types created by
+        // this function. The types are of the form:
+        //
+        //   interface Tuple<T0, T1, T2, ...> extends Array<T0 | T1 | T2 | ...> { 0: T0, 1: T1, 2: T2, ... }
+        //
+        // Note that the generic type created by this function has no symbol associated with it. The same
+        // is true for each of the synthesized type parameters.
         function createTupleTypeOfArity(arity) {
             var typeParameters = [];
             var properties = [];
             for (var i = 0; i < arity; i++) {
-                var typeParameter = createType(65536);
+                var typeParameter = createType(65536 /* TypeParameter */);
                 typeParameters.push(typeParameter);
-                var property = createSymbol(4, "" + i);
+                var property = createSymbol(4 /* Property */, "" + i);
                 property.type = typeParameter;
                 properties.push(property);
             }
-            var lengthSymbol = createSymbol(4, "length");
+            var lengthSymbol = createSymbol(4 /* Property */, "length");
             lengthSymbol.type = getLiteralType(arity);
             properties.push(lengthSymbol);
-            var type = createObjectType(8 | 4);
+            var type = createObjectType(8 /* Tuple */ | 4 /* Reference */);
             type.typeParameters = typeParameters;
             type.outerTypeParameters = undefined;
             type.localTypeParameters = typeParameters;
@@ -28035,7 +36541,7 @@ var ts;
             type.instantiations.set(getTypeListId(type.typeParameters), type);
             type.target = type;
             type.typeArguments = type.typeParameters;
-            type.thisType = createType(65536);
+            type.thisType = createType(65536 /* TypeParameter */);
             type.thisType.isThisType = true;
             type.thisType.constraint = type;
             type.declaredProperties = properties;
@@ -28064,20 +36570,28 @@ var ts;
         function containsType(types, type) {
             return ts.binarySearch(types, type, getTypeId, ts.compareValues) >= 0;
         }
+        // Return true if the given intersection type contains
+        // more than one unit type or,
+        // an object type and a nullable type (null or undefined), or
+        // a string-like type and a type known to be non-string-like, or
+        // a number-like type and a type known to be non-number-like, or
+        // a symbol-like type and a type known to be non-symbol-like, or
+        // a void-like type and a type known to be non-void-like, or
+        // a non-primitive type and a type known to be primitive.
         function isEmptyIntersectionType(type) {
             var combined = 0;
             for (var _i = 0, _a = type.types; _i < _a.length; _i++) {
                 var t = _a[_i];
-                if (t.flags & 27072 && combined & 27072) {
+                if (t.flags & 27072 /* Unit */ && combined & 27072 /* Unit */) {
                     return true;
                 }
                 combined |= t.flags;
-                if (combined & 24576 && combined & (131072 | 16777216) ||
-                    combined & 16777216 && combined & (16809468 & ~16777216) ||
-                    combined & 68 && combined & (16809468 & ~68) ||
-                    combined & 168 && combined & (16809468 & ~168) ||
-                    combined & 3072 && combined & (16809468 & ~3072) ||
-                    combined & 12288 && combined & (16809468 & ~12288)) {
+                if (combined & 24576 /* Nullable */ && combined & (131072 /* Object */ | 16777216 /* NonPrimitive */) ||
+                    combined & 16777216 /* NonPrimitive */ && combined & (16809468 /* DisjointDomains */ & ~16777216 /* NonPrimitive */) ||
+                    combined & 68 /* StringLike */ && combined & (16809468 /* DisjointDomains */ & ~68 /* StringLike */) ||
+                    combined & 168 /* NumberLike */ && combined & (16809468 /* DisjointDomains */ & ~168 /* NumberLike */) ||
+                    combined & 3072 /* ESSymbolLike */ && combined & (16809468 /* DisjointDomains */ & ~3072 /* ESSymbolLike */) ||
+                    combined & 12288 /* VoidLike */ && combined & (16809468 /* DisjointDomains */ & ~12288 /* VoidLike */)) {
                     return true;
                 }
             }
@@ -28085,25 +36599,29 @@ var ts;
         }
         function addTypeToUnion(typeSet, includes, type) {
             var flags = type.flags;
-            if (flags & 262144) {
+            if (flags & 262144 /* Union */) {
                 return addTypesToUnion(typeSet, includes, type.types);
             }
-            if (!(flags & 32768 || flags & 524288 && isEmptyIntersectionType(type))) {
-                includes |= flags & ~939524096;
-                if (flags & 3) {
+            // We ignore 'never' types in unions. Likewise, we ignore intersections of unit types as they are
+            // another form of 'never' (in that they have an empty value domain). We could in theory turn
+            // intersections of unit types into 'never' upon construction, but deferring the reduction makes it
+            // easier to reason about their origin.
+            if (!(flags & 32768 /* Never */ || flags & 524288 /* Intersection */ && isEmptyIntersectionType(type))) {
+                includes |= flags & ~939524096 /* ConstructionFlags */;
+                if (flags & 3 /* AnyOrUnknown */) {
                     if (type === wildcardType)
-                        includes |= 268435456;
+                        includes |= 268435456 /* Wildcard */;
                 }
-                else if (!strictNullChecks && flags & 24576) {
-                    if (!(flags & 134217728))
-                        includes |= 134217728;
+                else if (!strictNullChecks && flags & 24576 /* Nullable */) {
+                    if (!(flags & 134217728 /* ContainsWideningType */))
+                        includes |= 134217728 /* NonWideningType */;
                 }
                 else {
                     var len = typeSet.length;
                     var index = len && type.id > typeSet[len - 1].id ? ~len : ts.binarySearch(typeSet, type, getTypeId, ts.compareValues);
                     if (index < 0) {
-                        if (!(flags & 131072 && type.objectFlags & 16 &&
-                            type.symbol && type.symbol.flags & (16 | 8192) && containsIdenticalType(typeSet, type))) {
+                        if (!(flags & 131072 /* Object */ && type.objectFlags & 16 /* Anonymous */ &&
+                            type.symbol && type.symbol.flags & (16 /* Function */ | 8192 /* Method */) && containsIdenticalType(typeSet, type))) {
                             typeSet.splice(~index, 0, type);
                         }
                     }
@@ -28111,6 +36629,8 @@ var ts;
             }
             return includes;
         }
+        // Add the given types to the given type set. Order is preserved, duplicates are removed,
+        // and nested types of the given kind are flattened into the set.
         function addTypesToUnion(typeSet, includes, types) {
             for (var _i = 0, types_6 = types; _i < types_6.length; _i++) {
                 var type = types_6[_i];
@@ -28130,8 +36650,8 @@ var ts;
         function isSubtypeOfAny(source, targets) {
             for (var _i = 0, targets_1 = targets; _i < targets_1.length; _i++) {
                 var target = targets_1[_i];
-                if (source !== target && isTypeSubtypeOf(source, target) && (!(ts.getObjectFlags(getTargetType(source)) & 1) ||
-                    !(ts.getObjectFlags(getTargetType(target)) & 1) ||
+                if (source !== target && isTypeSubtypeOf(source, target) && (!(ts.getObjectFlags(getTargetType(source)) & 1 /* Class */) ||
+                    !(ts.getObjectFlags(getTargetType(target)) & 1 /* Class */) ||
                     isTypeDerivedFrom(source, target))) {
                     return true;
                 }
@@ -28140,11 +36660,11 @@ var ts;
         }
         function isSetOfLiteralsFromSameEnum(types) {
             var first = types[0];
-            if (first.flags & 512) {
+            if (first.flags & 512 /* EnumLiteral */) {
                 var firstEnum = getParentOfSymbol(first.symbol);
                 for (var i = 1; i < types.length; i++) {
                     var other = types[i];
-                    if (!(other.flags & 512) || (firstEnum !== getParentOfSymbol(other.symbol))) {
+                    if (!(other.flags & 512 /* EnumLiteral */) || (firstEnum !== getParentOfSymbol(other.symbol))) {
                         return false;
                     }
                 }
@@ -28169,17 +36689,24 @@ var ts;
             while (i > 0) {
                 i--;
                 var t = types[i];
-                var remove = t.flags & 64 && includes & 4 ||
-                    t.flags & 128 && includes & 8 ||
-                    t.flags & 2048 && includes & 1024 ||
-                    t.flags & 192 && t.flags & 33554432 && containsType(types, t.regularType);
+                var remove = t.flags & 64 /* StringLiteral */ && includes & 4 /* String */ ||
+                    t.flags & 128 /* NumberLiteral */ && includes & 8 /* Number */ ||
+                    t.flags & 2048 /* UniqueESSymbol */ && includes & 1024 /* ESSymbol */ ||
+                    t.flags & 192 /* StringOrNumberLiteral */ && t.flags & 33554432 /* FreshLiteral */ && containsType(types, t.regularType);
                 if (remove) {
                     ts.orderedRemoveItemAt(types, i);
                 }
             }
         }
+        // We sort and deduplicate the constituent types based on object identity. If the subtypeReduction
+        // flag is specified we also reduce the constituent type set to only include types that aren't subtypes
+        // of other types. Subtype reduction is expensive for large union types and is possible only when union
+        // types are known not to circularly reference themselves (as is the case with union types created by
+        // expression constructs such as array literals and the || and ?: operators). Named types can
+        // circularly reference themselves and therefore cannot be subtype reduced during their declaration.
+        // For example, "type Item = string | (() => Item" is a named type that circularly references itself.
         function getUnionType(types, unionReduction, aliasSymbol, aliasTypeArguments) {
-            if (unionReduction === void 0) { unionReduction = 1; }
+            if (unionReduction === void 0) { unionReduction = 1 /* Literal */; }
             if (types.length === 0) {
                 return neverType;
             }
@@ -28188,25 +36715,25 @@ var ts;
             }
             var typeSet = [];
             var includes = addTypesToUnion(typeSet, 0, types);
-            if (includes & 3) {
-                return includes & 1 ? includes & 268435456 ? wildcardType : anyType : unknownType;
+            if (includes & 3 /* AnyOrUnknown */) {
+                return includes & 1 /* Any */ ? includes & 268435456 /* Wildcard */ ? wildcardType : anyType : unknownType;
             }
             switch (unionReduction) {
-                case 1:
-                    if (includes & 2240) {
+                case 1 /* Literal */:
+                    if (includes & 2240 /* StringOrNumberLiteralOrUnique */) {
                         removeRedundantLiteralTypes(typeSet, includes);
                     }
                     break;
-                case 2:
+                case 2 /* Subtype */:
                     removeSubtypes(typeSet);
                     break;
             }
             if (typeSet.length === 0) {
-                return includes & 16384 ? includes & 134217728 ? nullType : nullWideningType :
-                    includes & 8192 ? includes & 134217728 ? undefinedType : undefinedWideningType :
+                return includes & 16384 /* Null */ ? includes & 134217728 /* NonWideningType */ ? nullType : nullWideningType :
+                    includes & 8192 /* Undefined */ ? includes & 134217728 /* NonWideningType */ ? undefinedType : undefinedWideningType :
                         neverType;
             }
-            return getUnionTypeFromSortedList(typeSet, includes & 16749629 ? 0 : 67108864, aliasSymbol, aliasTypeArguments);
+            return getUnionTypeFromSortedList(typeSet, includes & 16749629 /* NotUnit */ ? 0 : 67108864 /* UnionOfUnitTypes */, aliasSymbol, aliasTypeArguments);
         }
         function getUnionTypePredicate(signatures) {
             var first;
@@ -28219,6 +36746,7 @@ var ts;
                 }
                 if (first) {
                     if (!typePredicateKindsMatch(first, pred)) {
+                        // No common type predicate.
                         return undefined;
                     }
                 }
@@ -28228,6 +36756,7 @@ var ts;
                 types.push(pred.type);
             }
             if (!first) {
+                // No union signatures had a type predicate.
                 return undefined;
             }
             var unionType = getUnionType(types);
@@ -28240,6 +36769,7 @@ var ts;
                 ? ts.isIdentifierTypePredicate(b) && a.parameterIndex === b.parameterIndex
                 : !ts.isIdentifierTypePredicate(b);
         }
+        // This function assumes the constituent type list is sorted and deduplicated.
         function getUnionTypeFromSortedList(types, unionOfUnitTypes, aliasSymbol, aliasTypeArguments) {
             if (types.length === 0) {
                 return neverType;
@@ -28250,10 +36780,16 @@ var ts;
             var id = getTypeListId(types);
             var type = unionTypes.get(id);
             if (!type) {
-                var propagatedFlags = getPropagatingFlagsOfTypes(types, 24576);
-                type = createType(262144 | propagatedFlags | unionOfUnitTypes);
+                var propagatedFlags = getPropagatingFlagsOfTypes(types, /*excludeKinds*/ 24576 /* Nullable */);
+                type = createType(262144 /* Union */ | propagatedFlags | unionOfUnitTypes);
                 unionTypes.set(id, type);
                 type.types = types;
+                /*
+                Note: This is the alias symbol (or lack thereof) that we see when we first encounter this union type.
+                For aliases of identical unions, eg `type T = A | B; type U = A | B`, the symbol of the first alias encountered is the aliasSymbol.
+                (In the language service, the order may depend on the order in which a user takes actions, such as hovering over symbols.)
+                It's important that we create equivalent union types only once, so that's an unfortunate side effect.
+                */
                 type.aliasSymbol = aliasSymbol;
                 type.aliasTypeArguments = aliasTypeArguments;
             }
@@ -28263,33 +36799,35 @@ var ts;
             var links = getNodeLinks(node);
             if (!links.resolvedType) {
                 var aliasSymbol = getAliasSymbolForTypeNode(node);
-                links.resolvedType = getUnionType(ts.map(node.types, getTypeFromTypeNode), 1, aliasSymbol, getTypeArgumentsForAliasSymbol(aliasSymbol));
+                links.resolvedType = getUnionType(ts.map(node.types, getTypeFromTypeNode), 1 /* Literal */, aliasSymbol, getTypeArgumentsForAliasSymbol(aliasSymbol));
             }
             return links.resolvedType;
         }
         function addTypeToIntersection(typeSet, includes, type) {
             var flags = type.flags;
-            if (flags & 524288) {
+            if (flags & 524288 /* Intersection */) {
                 return addTypesToIntersection(typeSet, includes, type.types);
             }
-            if (ts.getObjectFlags(type) & 16 && isEmptyObjectType(type)) {
-                includes |= 536870912;
+            if (ts.getObjectFlags(type) & 16 /* Anonymous */ && isEmptyObjectType(type)) {
+                includes |= 536870912 /* EmptyObject */;
             }
             else {
-                includes |= flags & ~939524096;
-                if (flags & 3) {
+                includes |= flags & ~939524096 /* ConstructionFlags */;
+                if (flags & 3 /* AnyOrUnknown */) {
                     if (type === wildcardType)
-                        includes |= 268435456;
+                        includes |= 268435456 /* Wildcard */;
                 }
-                else if ((strictNullChecks || !(flags & 24576)) && !ts.contains(typeSet, type) &&
-                    !(flags & 131072 && type.objectFlags & 16 &&
-                        type.symbol && type.symbol.flags & (16 | 8192) &&
+                else if ((strictNullChecks || !(flags & 24576 /* Nullable */)) && !ts.contains(typeSet, type) &&
+                    !(flags & 131072 /* Object */ && type.objectFlags & 16 /* Anonymous */ &&
+                        type.symbol && type.symbol.flags & (16 /* Function */ | 8192 /* Method */) &&
                         containsIdenticalType(typeSet, type))) {
                     typeSet.push(type);
                 }
             }
             return includes;
         }
+        // Add the given types to the given type set. Order is preserved, freshness is removed from literal
+        // types, duplicates are removed, and nested types of the given kind are flattened into the set.
         function addTypesToIntersection(typeSet, includes, types) {
             for (var _i = 0, types_8 = types; _i < types_8.length; _i++) {
                 var type = types_8[_i];
@@ -28302,54 +36840,67 @@ var ts;
             while (i > 0) {
                 i--;
                 var t = types[i];
-                var remove = t.flags & 4 && includes & 64 ||
-                    t.flags & 8 && includes & 128 ||
-                    t.flags & 1024 && includes & 2048;
+                var remove = t.flags & 4 /* String */ && includes & 64 /* StringLiteral */ ||
+                    t.flags & 8 /* Number */ && includes & 128 /* NumberLiteral */ ||
+                    t.flags & 1024 /* ESSymbol */ && includes & 2048 /* UniqueESSymbol */;
                 if (remove) {
                     ts.orderedRemoveItemAt(types, i);
                 }
             }
         }
+        // When intersecting unions of unit types we can simply intersect based on type identity.
+        // Here we remove all unions of unit types from the given list and replace them with a
+        // a single union containing an intersection of the unit types.
         function intersectUnionsOfUnitTypes(types) {
-            var unionIndex = ts.findIndex(types, function (t) { return (t.flags & 67108864) !== 0; });
+            var unionIndex = ts.findIndex(types, function (t) { return (t.flags & 67108864 /* UnionOfUnitTypes */) !== 0; });
             var unionType = types[unionIndex];
             var intersection = unionType.types;
             var i = types.length - 1;
-            var _loop_5 = function () {
+            var _loop_3 = function () {
                 var t = types[i];
-                if (t.flags & 67108864) {
+                if (t.flags & 67108864 /* UnionOfUnitTypes */) {
                     intersection = ts.filter(intersection, function (u) { return containsType(t.types, u); });
                     ts.orderedRemoveItemAt(types, i);
                 }
                 i--;
             };
             while (i > unionIndex) {
-                _loop_5();
+                _loop_3();
             }
             if (intersection === unionType.types) {
                 return false;
             }
-            types[unionIndex] = getUnionTypeFromSortedList(intersection, unionType.flags & 67108864);
+            types[unionIndex] = getUnionTypeFromSortedList(intersection, unionType.flags & 67108864 /* UnionOfUnitTypes */);
             return true;
         }
+        // We normalize combinations of intersection and union types based on the distributive property of the '&'
+        // operator. Specifically, because X & (A | B) is equivalent to X & A | X & B, we can transform intersection
+        // types with union type constituents into equivalent union types with intersection type constituents and
+        // effectively ensure that union types are always at the top level in type representations.
+        //
+        // We do not perform structural deduplication on intersection types. Intersection types are created only by the &
+        // type operator and we can't reduce those because we want to support recursive intersection types. For example,
+        // a type alias of the form "type List<T> = T & { next: List<T> }" cannot be reduced during its declaration.
+        // Also, unlike union types, the order of the constituent types is preserved in order that overload resolution
+        // for intersections of types with signatures can be deterministic.
         function getIntersectionType(types, aliasSymbol, aliasTypeArguments) {
             var typeSet = [];
             var includes = addTypesToIntersection(typeSet, 0, types);
-            if (includes & 32768) {
+            if (includes & 32768 /* Never */) {
                 return neverType;
             }
-            if (includes & 1) {
-                return includes & 268435456 ? wildcardType : anyType;
+            if (includes & 1 /* Any */) {
+                return includes & 268435456 /* Wildcard */ ? wildcardType : anyType;
             }
-            if (!strictNullChecks && includes & 24576) {
-                return includes & 8192 ? undefinedType : nullType;
+            if (!strictNullChecks && includes & 24576 /* Nullable */) {
+                return includes & 8192 /* Undefined */ ? undefinedType : nullType;
             }
-            if (includes & 4 && includes & 64 ||
-                includes & 8 && includes & 128 ||
-                includes & 1024 && includes & 2048) {
+            if (includes & 4 /* String */ && includes & 64 /* StringLiteral */ ||
+                includes & 8 /* Number */ && includes & 128 /* NumberLiteral */ ||
+                includes & 1024 /* ESSymbol */ && includes & 2048 /* UniqueESSymbol */) {
                 removeRedundantPrimitiveTypes(typeSet, includes);
             }
-            if (includes & 536870912 && !(includes & 131072)) {
+            if (includes & 536870912 /* EmptyObject */ && !(includes & 131072 /* Object */)) {
                 typeSet.push(emptyObjectType);
             }
             if (typeSet.length === 0) {
@@ -28358,22 +36909,27 @@ var ts;
             if (typeSet.length === 1) {
                 return typeSet[0];
             }
-            if (includes & 262144) {
-                if (includes & 67108864 && intersectUnionsOfUnitTypes(typeSet)) {
+            if (includes & 262144 /* Union */) {
+                if (includes & 67108864 /* UnionOfUnitTypes */ && intersectUnionsOfUnitTypes(typeSet)) {
+                    // When the intersection creates a reduced set (which might mean that *all* union types have
+                    // disappeared), we restart the operation to get a new set of combined flags. Once we have
+                    // reduced we'll never reduce again, so this occurs at most once.
                     return getIntersectionType(typeSet, aliasSymbol, aliasTypeArguments);
                 }
-                var unionIndex_1 = ts.findIndex(typeSet, function (t) { return (t.flags & 262144) !== 0; });
+                // We are attempting to construct a type of the form X & (A | B) & Y. Transform this into a type of
+                // the form X & A & Y | X & B & Y and recursively reduce until no union type constituents remain.
+                var unionIndex_1 = ts.findIndex(typeSet, function (t) { return (t.flags & 262144 /* Union */) !== 0; });
                 var unionType = typeSet[unionIndex_1];
-                return getUnionType(ts.map(unionType.types, function (t) { return getIntersectionType(ts.replaceElement(typeSet, unionIndex_1, t)); }), 1, aliasSymbol, aliasTypeArguments);
+                return getUnionType(ts.map(unionType.types, function (t) { return getIntersectionType(ts.replaceElement(typeSet, unionIndex_1, t)); }), 1 /* Literal */, aliasSymbol, aliasTypeArguments);
             }
             var id = getTypeListId(typeSet);
             var type = intersectionTypes.get(id);
             if (!type) {
-                var propagatedFlags = getPropagatingFlagsOfTypes(typeSet, 24576);
-                type = createType(524288 | propagatedFlags);
+                var propagatedFlags = getPropagatingFlagsOfTypes(typeSet, /*excludeKinds*/ 24576 /* Nullable */);
+                type = createType(524288 /* Intersection */ | propagatedFlags);
                 intersectionTypes.set(id, type);
                 type.types = typeSet;
-                type.aliasSymbol = aliasSymbol;
+                type.aliasSymbol = aliasSymbol; // See comment in `getUnionTypeFromSortedList`.
                 type.aliasTypeArguments = aliasTypeArguments;
             }
             return type;
@@ -28387,23 +36943,23 @@ var ts;
             return links.resolvedType;
         }
         function createIndexType(type, stringsOnly) {
-            var result = createType(1048576);
+            var result = createType(1048576 /* Index */);
             result.type = type;
             result.stringsOnly = stringsOnly;
             return result;
         }
         function getIndexTypeForGenericType(type, stringsOnly) {
             return stringsOnly ?
-                type.resolvedStringIndexType || (type.resolvedStringIndexType = createIndexType(type, true)) :
-                type.resolvedIndexType || (type.resolvedIndexType = createIndexType(type, false));
+                type.resolvedStringIndexType || (type.resolvedStringIndexType = createIndexType(type, /*stringsOnly*/ true)) :
+                type.resolvedIndexType || (type.resolvedIndexType = createIndexType(type, /*stringsOnly*/ false));
         }
         function getLiteralTypeFromPropertyName(prop, include) {
-            if (!(ts.getDeclarationModifierFlagsFromSymbol(prop) & 24)) {
+            if (!(ts.getDeclarationModifierFlagsFromSymbol(prop) & 24 /* NonPublicAccessibilityModifier */)) {
                 var type = getLateBoundSymbol(prop).nameType;
                 if (!type && !ts.isKnownSymbol(prop)) {
                     var name = ts.getNameOfDeclaration(prop.valueDeclaration);
                     type = name && ts.isNumericLiteral(name) ? getLiteralType(+name.text) :
-                        name && name.kind === 147 && ts.isNumericLiteral(name.expression) ? getLiteralType(+name.expression.text) :
+                        name && name.kind === 147 /* ComputedPropertyName */ && ts.isNumericLiteral(name.expression) ? getLiteralType(+name.expression.text) :
                             getLiteralType(ts.symbolName(prop));
                 }
                 if (type && type.flags & include) {
@@ -28416,21 +36972,21 @@ var ts;
             return getUnionType(ts.map(getPropertiesOfType(type), function (t) { return getLiteralTypeFromPropertyName(t, include); }));
         }
         function getNonEnumNumberIndexInfo(type) {
-            var numberIndexInfo = getIndexInfoOfType(type, 1);
+            var numberIndexInfo = getIndexInfoOfType(type, 1 /* Number */);
             return numberIndexInfo !== enumNumberIndexInfo ? numberIndexInfo : undefined;
         }
         function getIndexType(type, stringsOnly) {
             if (stringsOnly === void 0) { stringsOnly = keyofStringsOnly; }
-            return type.flags & 262144 ? getIntersectionType(ts.map(type.types, function (t) { return getIndexType(t, stringsOnly); })) :
-                type.flags & 524288 ? getUnionType(ts.map(type.types, function (t) { return getIndexType(t, stringsOnly); })) :
-                    maybeTypeOfKind(type, 14745600) ? getIndexTypeForGenericType(type, stringsOnly) :
-                        ts.getObjectFlags(type) & 32 ? getConstraintTypeFromMappedType(type) :
+            return type.flags & 262144 /* Union */ ? getIntersectionType(ts.map(type.types, function (t) { return getIndexType(t, stringsOnly); })) :
+                type.flags & 524288 /* Intersection */ ? getUnionType(ts.map(type.types, function (t) { return getIndexType(t, stringsOnly); })) :
+                    maybeTypeOfKind(type, 14745600 /* InstantiableNonPrimitive */) ? getIndexTypeForGenericType(type, stringsOnly) :
+                        ts.getObjectFlags(type) & 32 /* Mapped */ ? getConstraintTypeFromMappedType(type) :
                             type === wildcardType ? wildcardType :
-                                type.flags & 1 ? keyofConstraintType :
-                                    stringsOnly ? getIndexInfoOfType(type, 0) ? stringType : getLiteralTypeFromPropertyNames(type, 64) :
-                                        getIndexInfoOfType(type, 0) ? getUnionType([stringType, numberType, getLiteralTypeFromPropertyNames(type, 2048)]) :
-                                            getNonEnumNumberIndexInfo(type) ? getUnionType([numberType, getLiteralTypeFromPropertyNames(type, 64 | 2048)]) :
-                                                getLiteralTypeFromPropertyNames(type, 2240);
+                                type.flags & 1 /* Any */ ? keyofConstraintType :
+                                    stringsOnly ? getIndexInfoOfType(type, 0 /* String */) ? stringType : getLiteralTypeFromPropertyNames(type, 64 /* StringLiteral */) :
+                                        getIndexInfoOfType(type, 0 /* String */) ? getUnionType([stringType, numberType, getLiteralTypeFromPropertyNames(type, 2048 /* UniqueESSymbol */)]) :
+                                            getNonEnumNumberIndexInfo(type) ? getUnionType([numberType, getLiteralTypeFromPropertyNames(type, 64 /* StringLiteral */ | 2048 /* UniqueESSymbol */)]) :
+                                                getLiteralTypeFromPropertyNames(type, 2240 /* StringOrNumberLiteralOrUnique */);
         }
         function getExtractStringType(type) {
             if (keyofStringsOnly) {
@@ -28441,41 +36997,41 @@ var ts;
         }
         function getIndexTypeOrString(type) {
             var indexType = getExtractStringType(getIndexType(type));
-            return indexType.flags & 32768 ? stringType : indexType;
+            return indexType.flags & 32768 /* Never */ ? stringType : indexType;
         }
         function getTypeFromTypeOperatorNode(node) {
             var links = getNodeLinks(node);
             if (!links.resolvedType) {
                 switch (node.operator) {
-                    case 128:
+                    case 128 /* KeyOfKeyword */:
                         links.resolvedType = getIndexType(getTypeFromTypeNode(node.type));
                         break;
-                    case 141:
-                        links.resolvedType = node.type.kind === 138
+                    case 141 /* UniqueKeyword */:
+                        links.resolvedType = node.type.kind === 138 /* SymbolKeyword */
                             ? getESSymbolLikeTypeForNode(ts.walkUpParenthesizedTypes(node.parent))
                             : errorType;
                         break;
                 }
             }
-            return links.resolvedType;
+            return links.resolvedType; // TODO: GH#18217
         }
         function createIndexedAccessType(objectType, indexType) {
-            var type = createType(2097152);
+            var type = createType(2097152 /* IndexedAccess */);
             type.objectType = objectType;
             type.indexType = indexType;
             return type;
         }
         function getPropertyTypeForIndexType(objectType, indexType, accessNode, cacheSymbol) {
-            var accessExpression = accessNode && accessNode.kind === 186 ? accessNode : undefined;
+            var accessExpression = accessNode && accessNode.kind === 186 /* ElementAccessExpression */ ? accessNode : undefined;
             var propName = isTypeUsableAsLateBoundName(indexType) ? getLateBoundNameFromType(indexType) :
-                accessExpression && checkThatExpressionIsProperSymbolReference(accessExpression.argumentExpression, indexType, false) ?
+                accessExpression && checkThatExpressionIsProperSymbolReference(accessExpression.argumentExpression, indexType, /*reportError*/ false) ?
                     ts.getPropertyNameForKnownSymbolName(ts.idText(accessExpression.argumentExpression.name)) :
                     undefined;
             if (propName !== undefined) {
                 var prop = getPropertyOfType(objectType, propName);
                 if (prop) {
                     if (accessExpression) {
-                        markPropertyAsReferenced(prop, accessExpression, accessExpression.expression.kind === 99);
+                        markPropertyAsReferenced(prop, accessExpression, /*isThisAccess*/ accessExpression.expression.kind === 99 /* ThisKeyword */);
                         if (ts.isAssignmentTarget(accessExpression) && (isReferenceToReadonlyEntity(accessExpression, prop) || isReferenceThroughNamespaceImport(accessExpression))) {
                             error(accessExpression.argumentExpression, ts.Diagnostics.Cannot_assign_to_0_because_it_is_a_constant_or_a_read_only_property, symbolToString(prop));
                             return errorType;
@@ -28487,16 +37043,16 @@ var ts;
                     return getTypeOfSymbol(prop);
                 }
             }
-            if (!(indexType.flags & 24576) && isTypeAssignableToKind(indexType, 68 | 168 | 3072)) {
+            if (!(indexType.flags & 24576 /* Nullable */) && isTypeAssignableToKind(indexType, 68 /* StringLike */ | 168 /* NumberLike */ | 3072 /* ESSymbolLike */)) {
                 if (isTypeAny(objectType)) {
                     return objectType;
                 }
-                var indexInfo = isTypeAssignableToKind(indexType, 168) && getIndexInfoOfType(objectType, 1) ||
-                    getIndexInfoOfType(objectType, 0) ||
+                var indexInfo = isTypeAssignableToKind(indexType, 168 /* NumberLike */) && getIndexInfoOfType(objectType, 1 /* Number */) ||
+                    getIndexInfoOfType(objectType, 0 /* String */) ||
                     undefined;
                 if (indexInfo) {
-                    if (accessNode && !isTypeAssignableToKind(indexType, 4 | 8)) {
-                        var indexNode = accessNode.kind === 186 ? accessNode.argumentExpression : accessNode.indexType;
+                    if (accessNode && !isTypeAssignableToKind(indexType, 4 /* String */ | 8 /* Number */)) {
+                        var indexNode = accessNode.kind === 186 /* ElementAccessExpression */ ? accessNode.argumentExpression : accessNode.indexType;
                         error(indexNode, ts.Diagnostics.Type_0_cannot_be_used_as_an_index_type, typeToString(indexType));
                     }
                     else if (accessExpression && indexInfo.isReadonly && (ts.isAssignmentTarget(accessExpression) || ts.isDeleteTarget(accessExpression))) {
@@ -28504,12 +37060,12 @@ var ts;
                     }
                     return indexInfo.type;
                 }
-                if (indexType.flags & 32768) {
+                if (indexType.flags & 32768 /* Never */) {
                     return neverType;
                 }
                 if (accessExpression && !isConstEnumObjectType(objectType)) {
                     if (noImplicitAny && !compilerOptions.suppressImplicitAnyIndexErrors) {
-                        if (getIndexTypeOfType(objectType, 1)) {
+                        if (getIndexTypeOfType(objectType, 1 /* Number */)) {
                             error(accessExpression.argumentExpression, ts.Diagnostics.Element_implicitly_has_an_any_type_because_index_expression_is_not_of_type_number);
                         }
                         else {
@@ -28520,11 +37076,11 @@ var ts;
                 }
             }
             if (accessNode) {
-                var indexNode = accessNode.kind === 186 ? accessNode.argumentExpression : accessNode.indexType;
-                if (indexType.flags & (64 | 128)) {
+                var indexNode = accessNode.kind === 186 /* ElementAccessExpression */ ? accessNode.argumentExpression : accessNode.indexType;
+                if (indexType.flags & (64 /* StringLiteral */ | 128 /* NumberLiteral */)) {
                     error(indexNode, ts.Diagnostics.Property_0_does_not_exist_on_type_1, "" + indexType.value, typeToString(objectType));
                 }
-                else if (indexType.flags & (4 | 8)) {
+                else if (indexType.flags & (4 /* String */ | 8 /* Number */)) {
                     error(indexNode, ts.Diagnostics.Type_0_has_no_matching_index_signature_for_type_1, typeToString(objectType), typeToString(indexType));
                 }
                 else {
@@ -28534,13 +37090,15 @@ var ts;
             return errorType;
         }
         function isGenericObjectType(type) {
-            return maybeTypeOfKind(type, 14745600 | 134217728);
+            return maybeTypeOfKind(type, 14745600 /* InstantiableNonPrimitive */ | 134217728 /* GenericMappedType */);
         }
         function isGenericIndexType(type) {
-            return maybeTypeOfKind(type, 14745600 | 1048576);
+            return maybeTypeOfKind(type, 14745600 /* InstantiableNonPrimitive */ | 1048576 /* Index */);
         }
+        // Return true if the given type is a non-generic object type with a string index signature and no
+        // other members.
         function isStringIndexOnlyType(type) {
-            if (type.flags & 131072 && !isGenericMappedType(type)) {
+            if (type.flags & 131072 /* Object */ && !isGenericMappedType(type)) {
                 var t = resolveStructuredTypeMembers(type);
                 return t.properties.length === 0 &&
                     t.callSignatures.length === 0 && t.constructSignatures.length === 0 &&
@@ -28549,25 +37107,33 @@ var ts;
             return false;
         }
         function isMappedTypeToNever(type) {
-            return !!(ts.getObjectFlags(type) & 32) && getTemplateTypeFromMappedType(type) === neverType;
+            return !!(ts.getObjectFlags(type) & 32 /* Mapped */) && getTemplateTypeFromMappedType(type) === neverType;
         }
         function getSimplifiedType(type) {
-            return type.flags & 2097152 ? getSimplifiedIndexedAccessType(type) : type;
+            return type.flags & 2097152 /* IndexedAccess */ ? getSimplifiedIndexedAccessType(type) : type;
         }
+        // Transform an indexed access to a simpler form, if possible. Return the simpler form, or return
+        // the type itself if no transformation is possible.
         function getSimplifiedIndexedAccessType(type) {
             if (type.simplified) {
                 return type.simplified === circularConstraintType ? type : type.simplified;
             }
             type.simplified = circularConstraintType;
+            // We recursively simplify the object type as it may in turn be an indexed access type. For example, with
+            // '{ [P in T]: { [Q in U]: number } }[T][U]' we want to first simplify the inner indexed access type.
             var objectType = getSimplifiedType(type.objectType);
-            if (objectType.flags & 524288 && isGenericObjectType(objectType)) {
+            if (objectType.flags & 524288 /* Intersection */ && isGenericObjectType(objectType)) {
+                // Given an indexed access type T[K], if T is an intersection containing one or more generic types and one or
+                // more object types with only a string index signature, e.g. '(U & V & { [x: string]: D })[K]', return a
+                // transformed type of the form '(U & V)[K] | D'. This allows us to properly reason about higher order indexed
+                // access types with default property values as expressed by D.
                 if (ts.some(objectType.types, isStringIndexOnlyType)) {
                     var regularTypes = [];
                     var stringIndexTypes = [];
                     for (var _i = 0, _a = objectType.types; _i < _a.length; _i++) {
                         var t = _a[_i];
                         if (isStringIndexOnlyType(t)) {
-                            stringIndexTypes.push(getIndexTypeOfType(t, 0));
+                            stringIndexTypes.push(getIndexTypeOfType(t, 0 /* String */));
                         }
                         else {
                             regularTypes.push(t);
@@ -28578,15 +37144,23 @@ var ts;
                         getIntersectionType(stringIndexTypes)
                     ]);
                 }
+                // Given an indexed access type T[K], if T is an intersection containing one or more generic types and one or
+                // more mapped types with a template type `never`, '(U & V & { [P in T]: never })[K]', return a
+                // transformed type that removes the never-mapped type: '(U & V)[K]'. This mirrors what would happen
+                // eventually anyway, but it easier to reason about.
                 if (ts.some(objectType.types, isMappedTypeToNever)) {
                     var nonNeverTypes = ts.filter(objectType.types, function (t) { return !isMappedTypeToNever(t); });
                     return type.simplified = getSimplifiedType(getIndexedAccessType(getIntersectionType(nonNeverTypes), type.indexType));
                 }
             }
+            // If the object type is a mapped type { [P in K]: E }, where K is generic, instantiate E using a mapper
+            // that substitutes the index type for P. For example, for an index access { [P in K]: Box<T[P]> }[X], we
+            // construct the type Box<T[X]>. We do not further simplify the result because mapped types can be recursive
+            // and we might never terminate.
             if (isGenericMappedType(objectType)) {
                 return type.simplified = substituteIndexedMappedType(objectType, type);
             }
-            if (objectType.flags & 65536) {
+            if (objectType.flags & 65536 /* TypeParameter */) {
                 var constraint = getConstraintFromTypeParameter(objectType);
                 if (constraint && isGenericMappedType(constraint)) {
                     return type.simplified = substituteIndexedMappedType(constraint, type);
@@ -28603,10 +37177,16 @@ var ts;
             if (objectType === wildcardType || indexType === wildcardType) {
                 return wildcardType;
             }
-            if (isGenericIndexType(indexType) || !(accessNode && accessNode.kind === 186) && isGenericObjectType(objectType)) {
-                if (objectType.flags & 3) {
+            // If the index type is generic, or if the object type is generic and doesn't originate in an expression,
+            // we are performing a higher-order index access where we cannot meaningfully access the properties of the
+            // object type. Note that for a generic T and a non-generic K, we eagerly resolve T[K] if it originates in
+            // an expression. This is to preserve backwards compatibility. For example, an element access 'this["foo"]'
+            // has always been resolved eagerly using the constraint type of 'this' at the given location.
+            if (isGenericIndexType(indexType) || !(accessNode && accessNode.kind === 186 /* ElementAccessExpression */) && isGenericObjectType(objectType)) {
+                if (objectType.flags & 3 /* AnyOrUnknown */) {
                     return objectType;
                 }
+                // Defer the operation by creating an indexed access type.
                 var id = objectType.id + "," + indexType.id;
                 var type = indexedAccessTypes.get(id);
                 if (!type) {
@@ -28614,12 +37194,15 @@ var ts;
                 }
                 return type;
             }
+            // In the following we resolve T[K] to the type of the property in T selected by K.
+            // We treat boolean as different from other unions to improve errors;
+            // skipping straight to getPropertyTypeForIndexType gives errors with 'boolean' instead of 'true'.
             var apparentObjectType = getApparentType(objectType);
-            if (indexType.flags & 262144 && !(indexType.flags & 16)) {
+            if (indexType.flags & 262144 /* Union */ && !(indexType.flags & 16 /* Boolean */)) {
                 var propTypes = [];
                 for (var _i = 0, _a = indexType.types; _i < _a.length; _i++) {
                     var t = _a[_i];
-                    var propType = getPropertyTypeForIndexType(apparentObjectType, t, accessNode, false);
+                    var propType = getPropertyTypeForIndexType(apparentObjectType, t, accessNode, /*cacheSymbol*/ false);
                     if (propType === errorType) {
                         return errorType;
                     }
@@ -28627,7 +37210,7 @@ var ts;
                 }
                 return getUnionType(propTypes);
             }
-            return getPropertyTypeForIndexType(apparentObjectType, indexType, accessNode, true);
+            return getPropertyTypeForIndexType(apparentObjectType, indexType, accessNode, /*cacheSymbol*/ true);
         }
         function getTypeFromIndexedAccessTypeNode(node) {
             var links = getNodeLinks(node);
@@ -28635,7 +37218,7 @@ var ts;
                 var objectType = getTypeFromTypeNode(node.objectType);
                 var indexType = getTypeFromTypeNode(node.indexType);
                 var resolved = getIndexedAccessType(objectType, indexType, node);
-                links.resolvedType = resolved.flags & 2097152 &&
+                links.resolvedType = resolved.flags & 2097152 /* IndexedAccess */ &&
                     resolved.objectType === objectType &&
                     resolved.indexType === indexType ?
                     getConstrainedTypeVariable(resolved, node) : resolved;
@@ -28645,17 +37228,19 @@ var ts;
         function getTypeFromMappedTypeNode(node) {
             var links = getNodeLinks(node);
             if (!links.resolvedType) {
-                var type = createObjectType(32, node.symbol);
+                var type = createObjectType(32 /* Mapped */, node.symbol);
                 type.declaration = node;
                 type.aliasSymbol = getAliasSymbolForTypeNode(node);
                 type.aliasTypeArguments = getTypeArgumentsForAliasSymbol(type.aliasSymbol);
                 links.resolvedType = type;
+                // Eagerly resolve the constraint type which forces an error if the constraint type circularly
+                // references itself through one or more type aliases.
                 getConstraintTypeFromMappedType(type);
             }
             return links.resolvedType;
         }
         function getActualTypeVariable(type) {
-            return type.flags & 8388608 ? type.typeVariable : type;
+            return type.flags & 8388608 /* Substitution */ ? type.typeVariable : type;
         }
         function getConditionalType(root, mapper) {
             var checkType = instantiateType(root.checkType, mapper);
@@ -28663,39 +37248,56 @@ var ts;
             if (checkType === wildcardType || extendsType === wildcardType) {
                 return wildcardType;
             }
-            var isDeferred = root.isDistributive && maybeTypeOfKind(checkType, 15794176);
+            // If this is a distributive conditional type and the check type is generic we need to defer
+            // resolution of the conditional type such that a later instantiation will properly distribute
+            // over union types.
+            var isDeferred = root.isDistributive && maybeTypeOfKind(checkType, 15794176 /* Instantiable */);
             var combinedMapper;
             if (root.inferTypeParameters) {
-                var context_1 = createInferenceContext(root.inferTypeParameters, undefined, 0);
+                var context = createInferenceContext(root.inferTypeParameters, /*signature*/ undefined, 0 /* None */);
                 if (!isDeferred) {
-                    inferTypes(context_1.inferences, checkType, extendsType, 32 | 64);
+                    // We don't want inferences from constraints as they may cause us to eagerly resolve the
+                    // conditional type instead of deferring resolution. Also, we always want strict function
+                    // types rules (i.e. proper contravariance) for inferences.
+                    inferTypes(context.inferences, checkType, extendsType, 32 /* NoConstraints */ | 64 /* AlwaysStrict */);
                 }
-                combinedMapper = combineTypeMappers(mapper, context_1);
+                combinedMapper = combineTypeMappers(mapper, context);
             }
             if (!isDeferred) {
-                if (extendsType.flags & 3) {
+                if (extendsType.flags & 3 /* AnyOrUnknown */) {
                     return instantiateType(root.trueType, mapper);
                 }
-                if (checkType.flags & 1) {
+                // Return union of trueType and falseType for 'any' since it matches anything
+                if (checkType.flags & 1 /* Any */) {
                     return getUnionType([instantiateType(root.trueType, combinedMapper || mapper), instantiateType(root.falseType, mapper)]);
                 }
+                // Instantiate the extends type including inferences for 'infer T' type parameters
                 var inferredExtendsType = combinedMapper ? instantiateType(root.extendsType, combinedMapper) : extendsType;
+                // Return falseType for a definitely false extends check. We check an instantations of the two
+                // types with type parameters mapped to the wildcard type, the most permissive instantiations
+                // possible (the wildcard type is assignable to and from all types). If those are not related,
+                // then no instatiations will be and we can just return the false branch type.
                 if (!isTypeAssignableTo(getWildcardInstantiation(checkType), getWildcardInstantiation(inferredExtendsType))) {
                     return instantiateType(root.falseType, mapper);
                 }
-                if (checkTypeRelatedTo(checkType, inferredExtendsType, definitelyAssignableRelation, undefined)) {
+                // Return trueType for a definitely true extends check. The definitely assignable relation excludes
+                // type variable constraints from consideration. Without the definitely assignable relation, the type
+                //   type Foo<T extends { x: any }> = T extends { x: string } ? string : number
+                // would immediately resolve to 'string' instead of being deferred.
+                if (checkTypeRelatedTo(checkType, inferredExtendsType, definitelyAssignableRelation, /*errorNode*/ undefined)) {
                     return instantiateType(root.trueType, combinedMapper || mapper);
                 }
             }
+            // Return a deferred type for a check that is neither definitely true nor definitely false
             var erasedCheckType = getActualTypeVariable(checkType);
-            var result = createType(4194304);
+            var result = createType(4194304 /* Conditional */);
             result.root = root;
             result.checkType = erasedCheckType;
             result.extendsType = extendsType;
             result.mapper = mapper;
             result.combinedMapper = combinedMapper;
             result.aliasSymbol = root.aliasSymbol;
-            result.aliasTypeArguments = instantiateTypes(root.aliasTypeArguments, mapper);
+            result.aliasTypeArguments = instantiateTypes(root.aliasTypeArguments, mapper); // TODO: GH#18217
             return result;
         }
         function getTrueTypeFromConditionalType(type) {
@@ -28708,7 +37310,7 @@ var ts;
             var result;
             if (node.locals) {
                 node.locals.forEach(function (symbol) {
-                    if (symbol.flags & 262144) {
+                    if (symbol.flags & 262144 /* TypeParameter */) {
                         result = ts.append(result, getDeclaredTypeOfSymbol(symbol));
                     }
                 });
@@ -28720,7 +37322,7 @@ var ts;
                 return true;
             }
             while (node) {
-                if (node.kind === 171) {
+                if (node.kind === 171 /* ConditionalType */) {
                     if (isTypeParameterPossiblyReferenced(tp, node.extendsType)) {
                         return true;
                     }
@@ -28735,7 +37337,7 @@ var ts;
                 var checkType = getTypeFromTypeNode(node.checkType);
                 var aliasSymbol = getAliasSymbolForTypeNode(node);
                 var aliasTypeArguments = getTypeArgumentsForAliasSymbol(aliasSymbol);
-                var allOuterTypeParameters = getOuterTypeParameters(node, true);
+                var allOuterTypeParameters = getOuterTypeParameters(node, /*includeThisTypes*/ true);
                 var outerTypeParameters = aliasTypeArguments ? allOuterTypeParameters : ts.filter(allOuterTypeParameters, function (tp) { return isPossiblyReferencedInConditionalType(tp, node); });
                 var root = {
                     node: node,
@@ -28743,14 +37345,14 @@ var ts;
                     extendsType: getTypeFromTypeNode(node.extendsType),
                     trueType: getTypeFromTypeNode(node.trueType),
                     falseType: getTypeFromTypeNode(node.falseType),
-                    isDistributive: !!(checkType.flags & 65536),
+                    isDistributive: !!(checkType.flags & 65536 /* TypeParameter */),
                     inferTypeParameters: getInferTypeParameters(node),
                     outerTypeParameters: outerTypeParameters,
                     instantiations: undefined,
                     aliasSymbol: aliasSymbol,
                     aliasTypeArguments: aliasTypeArguments
                 };
-                links.resolvedType = getConditionalType(root, undefined);
+                links.resolvedType = getConditionalType(root, /*mapper*/ undefined);
                 if (outerTypeParameters) {
                     root.instantiations = ts.createMap();
                     root.instantiations.set(getTypeListId(outerTypeParameters), links.resolvedType);
@@ -28776,7 +37378,7 @@ var ts;
         function getTypeFromImportTypeNode(node) {
             var links = getNodeLinks(node);
             if (!links.resolvedType) {
-                if (node.isTypeOf && node.typeArguments) {
+                if (node.isTypeOf && node.typeArguments) { // Only the non-typeof form can make use of type arguments
                     error(node, ts.Diagnostics.Type_arguments_cannot_be_used_here);
                     links.resolvedSymbol = unknownSymbol;
                     return links.resolvedType = errorType;
@@ -28787,20 +37389,21 @@ var ts;
                     return links.resolvedType = errorType;
                 }
                 var argumentType = getTypeFromTypeNode(node.argument);
-                var targetMeaning = node.isTypeOf ? 67216319 : 67901928;
+                var targetMeaning = node.isTypeOf ? 67216319 /* Value */ : 67901928 /* Type */;
+                // TODO: Future work: support unions/generics/whatever via a deferred import-type
                 var moduleName = argumentType.value;
-                var innerModuleSymbol = resolveExternalModule(node, moduleName, ts.Diagnostics.Cannot_find_module_0, node, false);
+                var innerModuleSymbol = resolveExternalModule(node, moduleName, ts.Diagnostics.Cannot_find_module_0, node, /*isForAugmentation*/ false);
                 if (!innerModuleSymbol) {
                     links.resolvedSymbol = unknownSymbol;
                     return links.resolvedType = errorType;
                 }
-                var moduleSymbol_1 = resolveExternalModuleSymbol(innerModuleSymbol, false);
+                var moduleSymbol_1 = resolveExternalModuleSymbol(innerModuleSymbol, /*dontResolveAlias*/ false);
                 if (!ts.nodeIsMissing(node.qualifier)) {
                     var nameStack = getIdentifierChain(node.qualifier);
                     var currentNamespace = moduleSymbol_1;
                     var current = void 0;
                     while (current = nameStack.shift()) {
-                        var meaning = nameStack.length ? 1920 : targetMeaning;
+                        var meaning = nameStack.length ? 1920 /* Namespace */ : targetMeaning;
                         var next = getSymbol(getExportsOfSymbol(getMergedSymbol(resolveSymbol(currentNamespace))), current.escapedText, meaning);
                         if (!next) {
                             error(current, ts.Diagnostics.Namespace_0_has_no_exported_member_1, getFullyQualifiedName(currentNamespace), ts.declarationNameToString(current));
@@ -28817,32 +37420,34 @@ var ts;
                         resolveImportSymbolType(node, links, moduleSymbol_1, targetMeaning);
                     }
                     else {
-                        error(node, targetMeaning === 67216319 ? ts.Diagnostics.Module_0_does_not_refer_to_a_value_but_is_used_as_a_value_here : ts.Diagnostics.Module_0_does_not_refer_to_a_type_but_is_used_as_a_type_here, moduleName);
+                        error(node, targetMeaning === 67216319 /* Value */ ? ts.Diagnostics.Module_0_does_not_refer_to_a_value_but_is_used_as_a_value_here : ts.Diagnostics.Module_0_does_not_refer_to_a_type_but_is_used_as_a_type_here, moduleName);
                         links.resolvedSymbol = unknownSymbol;
                         links.resolvedType = errorType;
                     }
                 }
             }
-            return links.resolvedType;
+            return links.resolvedType; // TODO: GH#18217
         }
         function resolveImportSymbolType(node, links, symbol, meaning) {
-            links.resolvedSymbol = symbol;
-            if (meaning === 67216319) {
-                return links.resolvedType = getTypeOfSymbol(symbol);
+            var resolvedSymbol = resolveSymbol(symbol);
+            links.resolvedSymbol = resolvedSymbol;
+            if (meaning === 67216319 /* Value */) {
+                return links.resolvedType = getTypeOfSymbol(symbol); // intentionally doesn't use resolved symbol so type is cached as expected on the alias
             }
             else {
-                return links.resolvedType = getTypeReferenceType(node, symbol);
+                return links.resolvedType = getTypeReferenceType(node, resolvedSymbol); // getTypeReferenceType doesn't handle aliases - it must get the resolved symbol
             }
         }
         function getTypeFromTypeLiteralOrFunctionOrConstructorTypeNode(node) {
             var links = getNodeLinks(node);
             if (!links.resolvedType) {
+                // Deferred resolution of members is handled by resolveObjectTypeMembers
                 var aliasSymbol = getAliasSymbolForTypeNode(node);
                 if (getMembersOfSymbol(node.symbol).size === 0 && !aliasSymbol) {
                     links.resolvedType = emptyTypeLiteralType;
                 }
                 else {
-                    var type = createObjectType(16, node.symbol);
+                    var type = createObjectType(16 /* Anonymous */, node.symbol);
                     type.aliasSymbol = aliasSymbol;
                     type.aliasTypeArguments = getTypeArgumentsForAliasSymbol(aliasSymbol);
                     if (ts.isJSDocTypeLiteral(node) && node.isArrayType) {
@@ -28859,26 +37464,31 @@ var ts;
         function getTypeArgumentsForAliasSymbol(symbol) {
             return symbol ? getLocalTypeParametersOfClassOrInterfaceOrTypeAlias(symbol) : undefined;
         }
+        /**
+         * Since the source of spread types are object literals, which are not binary,
+         * this function should be called in a left folding style, with left = previous result of getSpreadType
+         * and right = the new element to be spread.
+         */
         function getSpreadType(left, right, symbol, typeFlags, objectFlags) {
-            if (left.flags & 1 || right.flags & 1) {
+            if (left.flags & 1 /* Any */ || right.flags & 1 /* Any */) {
                 return anyType;
             }
-            if (left.flags & 2 || right.flags & 2) {
+            if (left.flags & 2 /* Unknown */ || right.flags & 2 /* Unknown */) {
                 return unknownType;
             }
-            if (left.flags & 32768) {
+            if (left.flags & 32768 /* Never */) {
                 return right;
             }
-            if (right.flags & 32768) {
+            if (right.flags & 32768 /* Never */) {
                 return left;
             }
-            if (left.flags & 262144) {
+            if (left.flags & 262144 /* Union */) {
                 return mapType(left, function (t) { return getSpreadType(t, right, symbol, typeFlags, objectFlags); });
             }
-            if (right.flags & 262144) {
+            if (right.flags & 262144 /* Union */) {
                 return mapType(right, function (t) { return getSpreadType(left, t, symbol, typeFlags, objectFlags); });
             }
-            if (right.flags & (272 | 168 | 68 | 544 | 16777216 | 1048576)) {
+            if (right.flags & (272 /* BooleanLike */ | 168 /* NumberLike */ | 68 /* StringLike */ | 544 /* EnumLike */ | 16777216 /* NonPrimitive */ | 1048576 /* Index */)) {
                 return left;
             }
             var members = ts.createSymbolTable();
@@ -28886,17 +37496,19 @@ var ts;
             var stringIndexInfo;
             var numberIndexInfo;
             if (left === emptyObjectType) {
-                stringIndexInfo = getIndexInfoOfType(right, 0);
-                numberIndexInfo = getIndexInfoOfType(right, 1);
+                // for the first spread element, left === emptyObjectType, so take the right's string indexer
+                stringIndexInfo = getIndexInfoOfType(right, 0 /* String */);
+                numberIndexInfo = getIndexInfoOfType(right, 1 /* Number */);
             }
             else {
-                stringIndexInfo = unionSpreadIndexInfos(getIndexInfoOfType(left, 0), getIndexInfoOfType(right, 0));
-                numberIndexInfo = unionSpreadIndexInfos(getIndexInfoOfType(left, 1), getIndexInfoOfType(right, 1));
+                stringIndexInfo = unionSpreadIndexInfos(getIndexInfoOfType(left, 0 /* String */), getIndexInfoOfType(right, 0 /* String */));
+                numberIndexInfo = unionSpreadIndexInfos(getIndexInfoOfType(left, 1 /* Number */), getIndexInfoOfType(right, 1 /* Number */));
             }
             for (var _i = 0, _a = getPropertiesOfType(right); _i < _a.length; _i++) {
                 var rightProp = _a[_i];
-                var isSetterWithoutGetter = rightProp.flags & 65536 && !(rightProp.flags & 32768);
-                if (ts.getDeclarationModifierFlagsFromSymbol(rightProp) & (8 | 16)) {
+                // we approximate own properties as non-methods plus methods that are inside the object literal
+                var isSetterWithoutGetter = rightProp.flags & 65536 /* SetAccessor */ && !(rightProp.flags & 32768 /* GetAccessor */);
+                if (ts.getDeclarationModifierFlagsFromSymbol(rightProp) & (8 /* Private */ | 16 /* Protected */)) {
                     skippedPrivateMembers.set(rightProp.escapedName, true);
                 }
                 else if (!isClassMethod(rightProp) && !isSetterWithoutGetter) {
@@ -28905,7 +37517,7 @@ var ts;
             }
             for (var _b = 0, _c = getPropertiesOfType(left); _b < _c.length; _b++) {
                 var leftProp = _c[_b];
-                if (leftProp.flags & 65536 && !(leftProp.flags & 32768)
+                if (leftProp.flags & 65536 /* SetAccessor */ && !(leftProp.flags & 32768 /* GetAccessor */)
                     || skippedPrivateMembers.has(leftProp.escapedName)
                     || isClassMethod(leftProp)) {
                     continue;
@@ -28913,11 +37525,11 @@ var ts;
                 if (members.has(leftProp.escapedName)) {
                     var rightProp = members.get(leftProp.escapedName);
                     var rightType = getTypeOfSymbol(rightProp);
-                    if (rightProp.flags & 16777216) {
+                    if (rightProp.flags & 16777216 /* Optional */) {
                         var declarations = ts.concatenate(leftProp.declarations, rightProp.declarations);
-                        var flags = 4 | (leftProp.flags & 16777216);
+                        var flags = 4 /* Property */ | (leftProp.flags & 16777216 /* Optional */);
                         var result = createSymbol(flags, leftProp.escapedName);
-                        result.type = getUnionType([getTypeOfSymbol(leftProp), getTypeWithFacts(rightType, 131072)]);
+                        result.type = getUnionType([getTypeOfSymbol(leftProp), getTypeWithFacts(rightType, 131072 /* NEUndefined */)]);
                         result.leftSpread = leftProp;
                         result.rightSpread = rightProp;
                         result.declarations = declarations;
@@ -28930,15 +37542,15 @@ var ts;
                 }
             }
             var spread = createAnonymousType(symbol, members, ts.emptyArray, ts.emptyArray, getNonReadonlyIndexSignature(stringIndexInfo), getNonReadonlyIndexSignature(numberIndexInfo));
-            spread.flags |= typeFlags | 268435456;
-            spread.objectFlags |= objectFlags | (128 | 1024);
+            spread.flags |= typeFlags | 268435456 /* ContainsObjectLiteral */;
+            spread.objectFlags |= objectFlags | (128 /* ObjectLiteral */ | 1024 /* ContainsSpread */);
             return spread;
         }
         function getNonReadonlySymbol(prop) {
             if (!isReadonlySymbol(prop)) {
                 return prop;
             }
-            var flags = 4 | (prop.flags & 16777216);
+            var flags = 4 /* Property */ | (prop.flags & 16777216 /* Optional */);
             var result = createSymbol(flags, prop.escapedName);
             result.type = getTypeOfSymbol(prop);
             result.declarations = prop.declarations;
@@ -28948,12 +37560,12 @@ var ts;
         }
         function getNonReadonlyIndexSignature(index) {
             if (index && index.isReadonly) {
-                return createIndexInfo(index.type, false, index.declaration);
+                return createIndexInfo(index.type, /*isReadonly*/ false, index.declaration);
             }
             return index;
         }
         function isClassMethod(prop) {
-            return prop.flags & 8192 && ts.find(prop.declarations, function (decl) { return ts.isClassLike(decl.parent); });
+            return prop.flags & 8192 /* Method */ && ts.find(prop.declarations, function (decl) { return ts.isClassLike(decl.parent); });
         }
         function createLiteralType(flags, value, symbol) {
             var type = createType(flags);
@@ -28962,9 +37574,9 @@ var ts;
             return type;
         }
         function getFreshTypeOfLiteralType(type) {
-            if (type.flags & 192 && !(type.flags & 33554432)) {
+            if (type.flags & 192 /* StringOrNumberLiteral */ && !(type.flags & 33554432 /* FreshLiteral */)) {
                 if (!type.freshType) {
-                    var freshType = createLiteralType(type.flags | 33554432, type.value, type.symbol);
+                    var freshType = createLiteralType(type.flags | 33554432 /* FreshLiteral */, type.value, type.symbol);
                     freshType.regularType = type;
                     type.freshType = freshType;
                 }
@@ -28973,16 +37585,20 @@ var ts;
             return type;
         }
         function getRegularTypeOfLiteralType(type) {
-            return type.flags & 192 && type.flags & 33554432 ? type.regularType :
-                type.flags & 262144 ? getUnionType(ts.sameMap(type.types, getRegularTypeOfLiteralType)) :
+            return type.flags & 192 /* StringOrNumberLiteral */ && type.flags & 33554432 /* FreshLiteral */ ? type.regularType :
+                type.flags & 262144 /* Union */ ? getUnionType(ts.sameMap(type.types, getRegularTypeOfLiteralType)) :
                     type;
         }
         function getLiteralType(value, enumId, symbol) {
+            // We store all literal types in a single map with keys of the form '#NNN' and '@SSS',
+            // where NNN is the text representation of a numeric literal and SSS are the characters
+            // of a string literal. For literal enum members we use 'EEE#NNN' and 'EEE@SSS', where
+            // EEE is a unique id for the containing enum type.
             var qualifier = typeof value === "number" ? "#" : "@";
             var key = enumId ? enumId + qualifier + value : qualifier + value;
             var type = literalTypes.get(key);
             if (!type) {
-                var flags = (typeof value === "number" ? 128 : 64) | (enumId ? 512 : 0);
+                var flags = (typeof value === "number" ? 128 /* NumberLiteral */ : 64 /* StringLiteral */) | (enumId ? 512 /* EnumLiteral */ : 0);
                 literalTypes.set(key, type = createLiteralType(flags, value, symbol));
             }
             return type;
@@ -28995,7 +37611,7 @@ var ts;
             return links.resolvedType;
         }
         function createUniqueESSymbolType(symbol) {
-            var type = createType(2048);
+            var type = createType(2048 /* UniqueESSymbol */);
             type.symbol = symbol;
             return type;
         }
@@ -29008,11 +37624,11 @@ var ts;
             return esSymbolType;
         }
         function getThisType(node) {
-            var container = ts.getThisContainer(node, false);
+            var container = ts.getThisContainer(node, /*includeArrowFunctions*/ false);
             var parent = container && container.parent;
-            if (parent && (ts.isClassLike(parent) || parent.kind === 236)) {
-                if (!ts.hasModifier(container, 32) &&
-                    (container.kind !== 155 || ts.isNodeDescendantOf(node, container.body))) {
+            if (parent && (ts.isClassLike(parent) || parent.kind === 236 /* InterfaceDeclaration */)) {
+                if (!ts.hasModifier(container, 32 /* Static */) &&
+                    (container.kind !== 155 /* Constructor */ || ts.isNodeDescendantOf(node, container.body))) {
                     return getDeclaredTypeOfClassOrInterface(getSymbolOfNode(parent)).thisType;
                 }
             }
@@ -29028,84 +37644,86 @@ var ts;
         }
         function getTypeFromTypeNode(node) {
             switch (node.kind) {
-                case 119:
-                case 279:
-                case 280:
+                case 119 /* AnyKeyword */:
+                case 279 /* JSDocAllType */:
+                case 280 /* JSDocUnknownType */:
                     return anyType;
-                case 142:
+                case 142 /* UnknownKeyword */:
                     return unknownType;
-                case 137:
+                case 137 /* StringKeyword */:
                     return stringType;
-                case 134:
+                case 134 /* NumberKeyword */:
                     return numberType;
-                case 122:
+                case 122 /* BooleanKeyword */:
                     return booleanType;
-                case 138:
+                case 138 /* SymbolKeyword */:
                     return esSymbolType;
-                case 105:
+                case 105 /* VoidKeyword */:
                     return voidType;
-                case 140:
+                case 140 /* UndefinedKeyword */:
                     return undefinedType;
-                case 95:
+                case 95 /* NullKeyword */:
                     return nullType;
-                case 131:
+                case 131 /* NeverKeyword */:
                     return neverType;
-                case 135:
-                    return node.flags & 65536 ? anyType : nonPrimitiveType;
-                case 174:
-                case 99:
+                case 135 /* ObjectKeyword */:
+                    return node.flags & 65536 /* JavaScriptFile */ ? anyType : nonPrimitiveType;
+                case 174 /* ThisType */:
+                case 99 /* ThisKeyword */:
                     return getTypeFromThisTypeNode(node);
-                case 178:
+                case 178 /* LiteralType */:
                     return getTypeFromLiteralTypeNode(node);
-                case 162:
+                case 162 /* TypeReference */:
                     return getTypeFromTypeReference(node);
-                case 161:
+                case 161 /* TypePredicate */:
                     return booleanType;
-                case 207:
+                case 207 /* ExpressionWithTypeArguments */:
                     return getTypeFromTypeReference(node);
-                case 165:
+                case 165 /* TypeQuery */:
                     return getTypeFromTypeQueryNode(node);
-                case 167:
+                case 167 /* ArrayType */:
                     return getTypeFromArrayTypeNode(node);
-                case 168:
+                case 168 /* TupleType */:
                     return getTypeFromTupleTypeNode(node);
-                case 169:
+                case 169 /* UnionType */:
                     return getTypeFromUnionTypeNode(node);
-                case 170:
+                case 170 /* IntersectionType */:
                     return getTypeFromIntersectionTypeNode(node);
-                case 281:
+                case 281 /* JSDocNullableType */:
                     return getTypeFromJSDocNullableTypeNode(node);
-                case 283:
+                case 283 /* JSDocOptionalType */:
                     return addOptionality(getTypeFromTypeNode(node.type));
-                case 173:
-                case 282:
-                case 278:
+                case 173 /* ParenthesizedType */:
+                case 282 /* JSDocNonNullableType */:
+                case 278 /* JSDocTypeExpression */:
                     return getTypeFromTypeNode(node.type);
-                case 285:
+                case 285 /* JSDocVariadicType */:
                     return getTypeFromJSDocVariadicType(node);
-                case 163:
-                case 164:
-                case 166:
-                case 287:
-                case 284:
-                case 288:
+                case 163 /* FunctionType */:
+                case 164 /* ConstructorType */:
+                case 166 /* TypeLiteral */:
+                case 287 /* JSDocTypeLiteral */:
+                case 284 /* JSDocFunctionType */:
+                case 288 /* JSDocSignature */:
                     return getTypeFromTypeLiteralOrFunctionOrConstructorTypeNode(node);
-                case 175:
+                case 175 /* TypeOperator */:
                     return getTypeFromTypeOperatorNode(node);
-                case 176:
+                case 176 /* IndexedAccessType */:
                     return getTypeFromIndexedAccessTypeNode(node);
-                case 177:
+                case 177 /* MappedType */:
                     return getTypeFromMappedTypeNode(node);
-                case 171:
+                case 171 /* ConditionalType */:
                     return getTypeFromConditionalTypeNode(node);
-                case 172:
+                case 172 /* InferType */:
                     return getTypeFromInferTypeNode(node);
-                case 179:
+                case 179 /* ImportType */:
                     return getTypeFromImportTypeNode(node);
-                case 71:
-                case 146:
+                // This function assumes that an identifier or qualified name is a type expression
+                // Callers should first ensure this by calling isTypeNode
+                case 71 /* Identifier */:
+                case 146 /* QualifiedName */:
                     var symbol = getSymbolAtLocation(node);
-                    return (symbol && getDeclaredTypeOfSymbol(symbol));
+                    return (symbol && getDeclaredTypeOfSymbol(symbol)); // TODO: GH#18217
                 default:
                     return errorType;
             }
@@ -29156,8 +37774,12 @@ var ts;
                     makeArrayTypeMapper(sources, targets);
         }
         function createTypeEraser(sources) {
-            return createTypeMapper(sources, undefined);
+            return createTypeMapper(sources, /*targets*/ undefined);
         }
+        /**
+         * Maps forward-references to later types parameters to the empty object type.
+         * This is used during inference when instantiating type parameter defaults.
+         */
         function createBackreferenceMapper(typeParameters, index) {
             return function (t) { return typeParameters.indexOf(t) >= index ? emptyObjectType : t; };
         }
@@ -29166,7 +37788,7 @@ var ts;
         }
         function cloneTypeMapper(mapper) {
             return mapper && isInferenceContext(mapper) ?
-                createInferenceContext(mapper.typeParameters, mapper.signature, mapper.flags | 2, mapper.compareTypes, mapper.inferences) :
+                createInferenceContext(mapper.typeParameters, mapper.signature, mapper.flags | 2 /* NoDefault */, mapper.compareTypes, mapper.inferences) :
                 mapper;
         }
         function combineTypeMappers(mapper1, mapper2) {
@@ -29180,10 +37802,10 @@ var ts;
             return function (t) { return t === source ? target : baseMapper(t); };
         }
         function wildcardMapper(type) {
-            return type.flags & 65536 ? wildcardType : type;
+            return type.flags & 65536 /* TypeParameter */ ? wildcardType : type;
         }
         function cloneTypeParameter(typeParameter) {
-            var result = createType(65536);
+            var result = createType(65536 /* TypeParameter */);
             result.symbol = typeParameter.symbol;
             result.target = typeParameter;
             return result;
@@ -29191,7 +37813,7 @@ var ts;
         function instantiateTypePredicate(predicate, mapper) {
             if (ts.isIdentifierTypePredicate(predicate)) {
                 return {
-                    kind: 1,
+                    kind: 1 /* Identifier */,
                     parameterName: predicate.parameterName,
                     parameterIndex: predicate.parameterIndex,
                     type: instantiateType(predicate.type, mapper)
@@ -29199,7 +37821,7 @@ var ts;
             }
             else {
                 return {
-                    kind: 0,
+                    kind: 0 /* This */,
                     type: instantiateType(predicate.type, mapper)
                 };
             }
@@ -29207,6 +37829,9 @@ var ts;
         function instantiateSignature(signature, mapper, eraseTypeParameters) {
             var freshTypeParameters;
             if (signature.typeParameters && !eraseTypeParameters) {
+                // First create a fresh set of type parameters, then include a mapping from the old to the
+                // new type parameters in the mapper function. Finally store this mapper in the new type
+                // parameters such that we can use it when instantiating constraints.
                 freshTypeParameters = ts.map(signature.typeParameters, cloneTypeParameter);
                 mapper = combineTypeMappers(createTypeMapper(signature.typeParameters, freshTypeParameters), mapper);
                 for (var _i = 0, freshTypeParameters_1 = freshTypeParameters; _i < freshTypeParameters_1.length; _i++) {
@@ -29214,21 +37839,33 @@ var ts;
                     tp.mapper = mapper;
                 }
             }
-            var result = createSignature(signature.declaration, freshTypeParameters, signature.thisParameter && instantiateSymbol(signature.thisParameter, mapper), instantiateList(signature.parameters, mapper, instantiateSymbol), undefined, undefined, signature.minArgumentCount, signature.hasRestParameter, signature.hasLiteralTypes);
+            // Don't compute resolvedReturnType and resolvedTypePredicate now,
+            // because using `mapper` now could trigger inferences to become fixed. (See `createInferenceContext`.)
+            // See GH#17600.
+            var result = createSignature(signature.declaration, freshTypeParameters, signature.thisParameter && instantiateSymbol(signature.thisParameter, mapper), instantiateList(signature.parameters, mapper, instantiateSymbol), 
+            /*resolvedReturnType*/ undefined, 
+            /*resolvedTypePredicate*/ undefined, signature.minArgumentCount, signature.hasRestParameter, signature.hasLiteralTypes);
             result.target = signature;
             result.mapper = mapper;
             return result;
         }
         function instantiateSymbol(symbol, mapper) {
             var links = getSymbolLinks(symbol);
-            if (links.type && !maybeTypeOfKind(links.type, 131072 | 15794176)) {
+            if (links.type && !maybeTypeOfKind(links.type, 131072 /* Object */ | 15794176 /* Instantiable */)) {
+                // If the type of the symbol is already resolved, and if that type could not possibly
+                // be affected by instantiation, simply return the symbol itself.
                 return symbol;
             }
-            if (ts.getCheckFlags(symbol) & 1) {
+            if (ts.getCheckFlags(symbol) & 1 /* Instantiated */) {
+                // If symbol being instantiated is itself a instantiation, fetch the original target and combine the
+                // type mappers. This ensures that original type identities are properly preserved and that aliases
+                // always reference a non-aliases.
                 symbol = links.target;
                 mapper = combineTypeMappers(links.mapper, mapper);
             }
-            var result = createSymbol(symbol.flags, symbol.escapedName, 1 | (ts.getCheckFlags(symbol) & 1024));
+            // Keep the flags from the symbol we're instantiating.  Mark that is instantiated, and
+            // also transient so that we can just store data on it directly.
+            var result = createSymbol(symbol.flags, symbol.escapedName, 1 /* Instantiated */ | (ts.getCheckFlags(symbol) & 1024 /* Late */));
             result.declarations = symbol.declarations;
             result.parent = symbol.parent;
             result.target = symbol;
@@ -29247,11 +37884,15 @@ var ts;
             return result;
         }
         function getAnonymousTypeInstantiation(type, mapper) {
-            var target = type.objectFlags & 64 ? type.target : type;
+            var target = type.objectFlags & 64 /* Instantiated */ ? type.target : type;
             var symbol = target.symbol;
             var links = getSymbolLinks(symbol);
             var typeParameters = links.outerTypeParameters;
             if (!typeParameters) {
+                // The first time an anonymous type is instantiated we compute and store a list of the type
+                // parameters that are in scope (and therefore potentially referenced). For type literals that
+                // aren't the right hand side of a generic type alias declaration we optimize by reducing the
+                // set of type parameters to those that are possibly referenced in the literal.
                 var declaration_1 = symbol.declarations[0];
                 if (ts.isInJavaScriptFile(declaration_1)) {
                     var paramTag = ts.findAncestor(declaration_1, ts.isJSDocParameterTag);
@@ -29262,13 +37903,13 @@ var ts;
                         }
                     }
                 }
-                var outerTypeParameters = getOuterTypeParameters(declaration_1, true);
+                var outerTypeParameters = getOuterTypeParameters(declaration_1, /*includeThisTypes*/ true);
                 if (isJavaScriptConstructor(declaration_1)) {
                     var templateTagParameters = getTypeParametersFromDeclaration(declaration_1);
                     outerTypeParameters = ts.addRange(outerTypeParameters, templateTagParameters);
                 }
                 typeParameters = outerTypeParameters || ts.emptyArray;
-                typeParameters = symbol.flags & 2048 && !target.aliasTypeArguments ?
+                typeParameters = symbol.flags & 2048 /* TypeLiteral */ && !target.aliasTypeArguments ?
                     ts.filter(typeParameters, function (tp) { return isTypeParameterPossiblyReferenced(tp, declaration_1); }) :
                     typeParameters;
                 links.outerTypeParameters = typeParameters;
@@ -29278,13 +37919,16 @@ var ts;
                 }
             }
             if (typeParameters.length) {
-                var combinedMapper = type.objectFlags & 64 ? combineTypeMappers(type.mapper, mapper) : mapper;
+                // We are instantiating an anonymous type that has one or more type parameters in scope. Apply the
+                // mapper to the type parameters to produce the effective list of type arguments, and compute the
+                // instantiation cache key from the type IDs of the type arguments.
+                var combinedMapper = type.objectFlags & 64 /* Instantiated */ ? combineTypeMappers(type.mapper, mapper) : mapper;
                 var typeArguments = ts.map(typeParameters, combinedMapper);
                 var id = getTypeListId(typeArguments);
                 var result = links.instantiations.get(id);
                 if (!result) {
                     var newMapper = createTypeMapper(typeParameters, typeArguments);
-                    result = target.objectFlags & 32 ? instantiateMappedType(target, newMapper) : instantiateAnonymousType(target, newMapper);
+                    result = target.objectFlags & 32 /* Mapped */ ? instantiateMappedType(target, newMapper) : instantiateAnonymousType(target, newMapper);
                     links.instantiations.set(id, result);
                 }
                 return result;
@@ -29292,35 +37936,43 @@ var ts;
             return type;
         }
         function maybeTypeParameterReference(node) {
-            return !(node.kind === 146 ||
-                node.parent.kind === 162 && node.parent.typeArguments && node === node.parent.typeName);
+            return !(node.kind === 146 /* QualifiedName */ ||
+                node.parent.kind === 162 /* TypeReference */ && node.parent.typeArguments && node === node.parent.typeName);
         }
         function isTypeParameterPossiblyReferenced(tp, node) {
+            // If the type parameter doesn't have exactly one declaration, if there are invening statement blocks
+            // between the node and the type parameter declaration, if the node contains actual references to the
+            // type parameter, or if the node contains type queries, we consider the type parameter possibly referenced.
             if (tp.symbol && tp.symbol.declarations && tp.symbol.declarations.length === 1) {
                 var container_3 = tp.symbol.declarations[0].parent;
-                if (ts.findAncestor(node, function (n) { return n.kind === 213 ? "quit" : n === container_3; })) {
+                if (ts.findAncestor(node, function (n) { return n.kind === 213 /* Block */ ? "quit" : n === container_3; })) {
                     return !!ts.forEachChild(node, containsReference);
                 }
             }
             return true;
             function containsReference(node) {
                 switch (node.kind) {
-                    case 174:
+                    case 174 /* ThisType */:
                         return !!tp.isThisType;
-                    case 71:
+                    case 71 /* Identifier */:
                         return !tp.isThisType && ts.isPartOfTypeNode(node) && maybeTypeParameterReference(node) &&
                             getTypeFromTypeNode(node) === tp;
-                    case 165:
+                    case 165 /* TypeQuery */:
                         return true;
                 }
                 return !!ts.forEachChild(node, containsReference);
             }
         }
         function instantiateMappedType(type, mapper) {
+            // Check if we have a homomorphic mapped type, i.e. a type of the form { [P in keyof T]: X } for some
+            // type variable T. If so, the mapped type is distributive over a union type and when T is instantiated
+            // to a union type A | B, we produce { [P in keyof A]: X } | { [P in keyof B]: X }. Furthermore, for
+            // homomorphic mapped types we leave primitive types alone. For example, when T is instantiated to a
+            // union type A | undefined, we produce { [P in keyof A]: X } | undefined.
             var constraintType = getConstraintTypeFromMappedType(type);
-            if (constraintType.flags & 1048576) {
+            if (constraintType.flags & 1048576 /* Index */) {
                 var typeVariable_1 = constraintType.type;
-                if (typeVariable_1.flags & 65536) {
+                if (typeVariable_1.flags & 65536 /* TypeParameter */) {
                     var mappedTypeVariable = instantiateType(typeVariable_1, mapper);
                     if (typeVariable_1 !== mappedTypeVariable) {
                         return mapType(mappedTypeVariable, function (t) {
@@ -29335,11 +37987,11 @@ var ts;
             return instantiateAnonymousType(type, mapper);
         }
         function isMappableType(type) {
-            return type.flags & (3 | 14745600 | 131072 | 524288);
+            return type.flags & (3 /* AnyOrUnknown */ | 14745600 /* InstantiableNonPrimitive */ | 131072 /* Object */ | 524288 /* Intersection */);
         }
         function instantiateAnonymousType(type, mapper) {
-            var result = createObjectType(type.objectFlags | 64, type.symbol);
-            if (type.objectFlags & 32) {
+            var result = createObjectType(type.objectFlags | 64 /* Instantiated */, type.symbol);
+            if (type.objectFlags & 32 /* Mapped */) {
                 result.declaration = type.declaration;
             }
             result.target = type;
@@ -29351,6 +38003,9 @@ var ts;
         function getConditionalTypeInstantiation(type, mapper) {
             var root = type.root;
             if (root.outerTypeParameters) {
+                // We are instantiating a conditional type that has one or more type parameters in scope. Apply the
+                // mapper to the type parameters to produce the effective list of type arguments, and compute the
+                // instantiation cache key from the type IDs of the type arguments.
                 var typeArguments = ts.map(root.outerTypeParameters, mapper);
                 var id = getTypeListId(typeArguments);
                 var result = root.instantiations.get(id);
@@ -29364,10 +38019,13 @@ var ts;
             return type;
         }
         function instantiateConditionalType(root, mapper) {
+            // Check if we have a conditional type where the check type is a naked type parameter. If so,
+            // the conditional type is distributive over union types and when T is instantiated to a union
+            // type A | B, we produce (A extends U ? X : Y) | (B extends U ? X : Y).
             if (root.isDistributive) {
                 var checkType_1 = root.checkType;
                 var instantiatedType = mapper(checkType_1);
-                if (checkType_1 !== instantiatedType && instantiatedType.flags & (262144 | 32768)) {
+                if (checkType_1 !== instantiatedType && instantiatedType.flags & (262144 /* Union */ | 32768 /* Never */)) {
                     return mapType(instantiatedType, function (t) { return getConditionalType(root, createReplacementMapper(checkType_1, t, mapper)); });
                 }
             }
@@ -29375,83 +38033,90 @@ var ts;
         }
         function instantiateType(type, mapper) {
             if (type && mapper && mapper !== identityMapper) {
-                if (type.flags & 65536) {
+                if (type.flags & 65536 /* TypeParameter */) {
                     return mapper(type);
                 }
-                if (type.flags & 131072) {
-                    if (type.objectFlags & 16) {
-                        return type.symbol && type.symbol.flags & (16 | 8192 | 32 | 2048 | 4096) && type.symbol.declarations ?
+                if (type.flags & 131072 /* Object */) {
+                    if (type.objectFlags & 16 /* Anonymous */) {
+                        // If the anonymous type originates in a declaration of a function, method, class, or
+                        // interface, in an object type literal, or in an object literal expression, we may need
+                        // to instantiate the type because it might reference a type parameter.
+                        return type.symbol && type.symbol.flags & (16 /* Function */ | 8192 /* Method */ | 32 /* Class */ | 2048 /* TypeLiteral */ | 4096 /* ObjectLiteral */) && type.symbol.declarations ?
                             getAnonymousTypeInstantiation(type, mapper) : type;
                     }
-                    if (type.objectFlags & 32) {
+                    if (type.objectFlags & 32 /* Mapped */) {
                         return getAnonymousTypeInstantiation(type, mapper);
                     }
-                    if (type.objectFlags & 4) {
+                    if (type.objectFlags & 4 /* Reference */) {
                         var typeArguments = type.typeArguments;
                         var newTypeArguments = instantiateTypes(typeArguments, mapper);
                         return newTypeArguments !== typeArguments ? createTypeReference(type.target, newTypeArguments) : type;
                     }
                 }
-                if (type.flags & 262144 && !(type.flags & 32764)) {
+                if (type.flags & 262144 /* Union */ && !(type.flags & 32764 /* Primitive */)) {
                     var types = type.types;
                     var newTypes = instantiateTypes(types, mapper);
-                    return newTypes !== types ? getUnionType(newTypes, 1, type.aliasSymbol, instantiateTypes(type.aliasTypeArguments, mapper)) : type;
+                    return newTypes !== types ? getUnionType(newTypes, 1 /* Literal */, type.aliasSymbol, instantiateTypes(type.aliasTypeArguments, mapper)) : type;
                 }
-                if (type.flags & 524288) {
+                if (type.flags & 524288 /* Intersection */) {
                     var types = type.types;
                     var newTypes = instantiateTypes(types, mapper);
                     return newTypes !== types ? getIntersectionType(newTypes, type.aliasSymbol, instantiateTypes(type.aliasTypeArguments, mapper)) : type;
                 }
-                if (type.flags & 1048576) {
+                if (type.flags & 1048576 /* Index */) {
                     return getIndexType(instantiateType(type.type, mapper));
                 }
-                if (type.flags & 2097152) {
+                if (type.flags & 2097152 /* IndexedAccess */) {
                     return getIndexedAccessType(instantiateType(type.objectType, mapper), instantiateType(type.indexType, mapper));
                 }
-                if (type.flags & 4194304) {
+                if (type.flags & 4194304 /* Conditional */) {
                     return getConditionalTypeInstantiation(type, combineTypeMappers(type.mapper, mapper));
                 }
-                if (type.flags & 8388608) {
+                if (type.flags & 8388608 /* Substitution */) {
                     return instantiateType(type.typeVariable, mapper);
                 }
             }
             return type;
         }
         function getWildcardInstantiation(type) {
-            return type.flags & (32764 | 3 | 32768) ? type :
+            return type.flags & (32764 /* Primitive */ | 3 /* AnyOrUnknown */ | 32768 /* Never */) ? type :
                 type.wildcardInstantiation || (type.wildcardInstantiation = instantiateType(type, wildcardMapper));
         }
         function instantiateIndexInfo(info, mapper) {
             return info && createIndexInfo(instantiateType(info.type, mapper), info.isReadonly, info.declaration);
         }
+        // Returns true if the given expression contains (at any level of nesting) a function or arrow expression
+        // that is subject to contextual typing.
         function isContextSensitive(node) {
-            ts.Debug.assert(node.kind !== 154 || ts.isObjectLiteralMethod(node));
+            ts.Debug.assert(node.kind !== 154 /* MethodDeclaration */ || ts.isObjectLiteralMethod(node));
             switch (node.kind) {
-                case 192:
-                case 193:
-                case 154:
+                case 192 /* FunctionExpression */:
+                case 193 /* ArrowFunction */:
+                case 154 /* MethodDeclaration */:
                     return isContextSensitiveFunctionLikeDeclaration(node);
-                case 184:
+                case 184 /* ObjectLiteralExpression */:
                     return ts.some(node.properties, isContextSensitive);
-                case 183:
+                case 183 /* ArrayLiteralExpression */:
                     return ts.some(node.elements, isContextSensitive);
-                case 201:
+                case 201 /* ConditionalExpression */:
                     return isContextSensitive(node.whenTrue) ||
                         isContextSensitive(node.whenFalse);
-                case 200:
-                    return node.operatorToken.kind === 54 &&
+                case 200 /* BinaryExpression */:
+                    return node.operatorToken.kind === 54 /* BarBarToken */ &&
                         (isContextSensitive(node.left) || isContextSensitive(node.right));
-                case 270:
+                case 270 /* PropertyAssignment */:
                     return isContextSensitive(node.initializer);
-                case 191:
+                case 191 /* ParenthesizedExpression */:
                     return isContextSensitive(node.expression);
-                case 263:
+                case 263 /* JsxAttributes */:
                     return ts.some(node.properties, isContextSensitive);
-                case 262: {
+                case 262 /* JsxAttribute */: {
+                    // If there is no initializer, JSX attribute has a boolean value of true which is not context sensitive.
                     var initializer = node.initializer;
                     return !!initializer && isContextSensitive(initializer);
                 }
-                case 265: {
+                case 265 /* JsxExpression */: {
+                    // It is possible to that node.expression is undefined (e.g <div x={} />)
                     var expression = node.expression;
                     return !!expression && isContextSensitive(expression);
                 }
@@ -29459,30 +38124,35 @@ var ts;
             return false;
         }
         function isContextSensitiveFunctionLikeDeclaration(node) {
+            // Functions with type parameters are not context sensitive.
             if (node.typeParameters) {
                 return false;
             }
+            // Functions with any parameters that lack type annotations are context sensitive.
             if (ts.some(node.parameters, function (p) { return !ts.getEffectiveTypeAnnotationNode(p); })) {
                 return true;
             }
-            if (node.kind !== 193) {
+            if (node.kind !== 193 /* ArrowFunction */) {
+                // If the first parameter is not an explicit 'this' parameter, then the function has
+                // an implicit 'this' parameter which is subject to contextual typing.
                 var parameter = ts.firstOrUndefined(node.parameters);
                 if (!(parameter && ts.parameterIsThisKeyword(parameter))) {
                     return true;
                 }
             }
+            // TODO(anhans): A block should be context-sensitive if it has a context-sensitive return value.
             var body = node.body;
-            return body.kind === 213 ? false : isContextSensitive(body);
+            return body.kind === 213 /* Block */ ? false : isContextSensitive(body);
         }
         function isContextSensitiveFunctionOrObjectLiteralMethod(func) {
             return (ts.isInJavaScriptFile(func) && ts.isFunctionDeclaration(func) || isFunctionExpressionOrArrowFunction(func) || ts.isObjectLiteralMethod(func)) &&
                 isContextSensitiveFunctionLikeDeclaration(func);
         }
         function getTypeWithoutSignatures(type) {
-            if (type.flags & 131072) {
+            if (type.flags & 131072 /* Object */) {
                 var resolved = resolveStructuredTypeMembers(type);
                 if (resolved.constructSignatures.length) {
-                    var result = createObjectType(16, type.symbol);
+                    var result = createObjectType(16 /* Anonymous */, type.symbol);
                     result.members = resolved.members;
                     result.properties = resolved.properties;
                     result.callSignatures = ts.emptyArray;
@@ -29490,19 +38160,20 @@ var ts;
                     return result;
                 }
             }
-            else if (type.flags & 524288) {
+            else if (type.flags & 524288 /* Intersection */) {
                 return getIntersectionType(ts.map(type.types, getTypeWithoutSignatures));
             }
             return type;
         }
+        // TYPE CHECKING
         function isTypeIdenticalTo(source, target) {
             return isTypeRelatedTo(source, target, identityRelation);
         }
         function compareTypesIdentical(source, target) {
-            return isTypeRelatedTo(source, target, identityRelation) ? -1 : 0;
+            return isTypeRelatedTo(source, target, identityRelation) ? -1 /* True */ : 0 /* False */;
         }
         function compareTypesAssignable(source, target) {
-            return isTypeRelatedTo(source, target, assignableRelation) ? -1 : 0;
+            return isTypeRelatedTo(source, target, assignableRelation) ? -1 /* True */ : 0 /* False */;
         }
         function isTypeSubtypeOf(source, target) {
             return isTypeRelatedTo(source, target, subtypeRelation);
@@ -29510,13 +38181,31 @@ var ts;
         function isTypeAssignableTo(source, target) {
             return isTypeRelatedTo(source, target, assignableRelation);
         }
+        // An object type S is considered to be derived from an object type T if
+        // S is a union type and every constituent of S is derived from T,
+        // T is a union type and S is derived from at least one constituent of T, or
+        // S is a type variable with a base constraint that is derived from T,
+        // T is one of the global types Object and Function and S is a subtype of T, or
+        // T occurs directly or indirectly in an 'extends' clause of S.
+        // Note that this check ignores type parameters and only considers the
+        // inheritance hierarchy.
         function isTypeDerivedFrom(source, target) {
-            return source.flags & 262144 ? ts.every(source.types, function (t) { return isTypeDerivedFrom(t, target); }) :
-                target.flags & 262144 ? ts.some(target.types, function (t) { return isTypeDerivedFrom(source, t); }) :
-                    source.flags & 14745600 ? isTypeDerivedFrom(getBaseConstraintOfType(source) || emptyObjectType, target) :
+            return source.flags & 262144 /* Union */ ? ts.every(source.types, function (t) { return isTypeDerivedFrom(t, target); }) :
+                target.flags & 262144 /* Union */ ? ts.some(target.types, function (t) { return isTypeDerivedFrom(source, t); }) :
+                    source.flags & 14745600 /* InstantiableNonPrimitive */ ? isTypeDerivedFrom(getBaseConstraintOfType(source) || emptyObjectType, target) :
                         target === globalObjectType || target === globalFunctionType ? isTypeSubtypeOf(source, target) :
                             hasBaseType(source, getTargetType(target));
         }
+        /**
+         * This is *not* a bi-directional relationship.
+         * If one needs to check both directions for comparability, use a second call to this function or 'checkTypeComparableTo'.
+         *
+         * A type S is comparable to a type T if some (but not necessarily all) of the possible values of S are also possible values of T.
+         * It is used to check following cases:
+         *   - the types of the left and right sides of equality/inequality operators (`===`, `!==`, `==`, `!=`).
+         *   - the types of `case` clause expressions and their respective `switch` expressions.
+         *   - the type of an expression in a type assertion with the type being asserted.
+         */
         function isTypeComparableTo(source, target) {
             return isTypeRelatedTo(source, target, comparableRelation);
         }
@@ -29526,38 +38215,48 @@ var ts;
         function checkTypeAssignableTo(source, target, errorNode, headMessage, containingMessageChain) {
             return checkTypeRelatedTo(source, target, assignableRelation, errorNode, headMessage, containingMessageChain);
         }
+        /**
+         * This is *not* a bi-directional relationship.
+         * If one needs to check both directions for comparability, use a second call to this function or 'isTypeComparableTo'.
+         */
         function checkTypeComparableTo(source, target, errorNode, headMessage, containingMessageChain) {
             return checkTypeRelatedTo(source, target, comparableRelation, errorNode, headMessage, containingMessageChain);
         }
         function isSignatureAssignableTo(source, target, ignoreReturnTypes) {
-            return compareSignaturesRelated(source, target, 0, ignoreReturnTypes, false, undefined, compareTypesAssignable) !== 0;
+            return compareSignaturesRelated(source, target, 0 /* None */, ignoreReturnTypes, /*reportErrors*/ false, 
+            /*errorReporter*/ undefined, compareTypesAssignable) !== 0 /* False */;
         }
+        /**
+         * See signatureRelatedTo, compareSignaturesIdentical
+         */
         function compareSignaturesRelated(source, target, callbackCheck, ignoreReturnTypes, reportErrors, errorReporter, compareTypes) {
+            // TODO (drosen): De-duplicate code between related functions.
             if (source === target) {
-                return -1;
+                return -1 /* True */;
             }
             if (!target.hasRestParameter && source.minArgumentCount > target.parameters.length) {
-                return 0;
+                return 0 /* False */;
             }
             if (source.typeParameters && source.typeParameters !== target.typeParameters) {
                 target = getCanonicalSignature(target);
-                source = instantiateSignatureInContextOf(source, target, undefined, compareTypes);
+                source = instantiateSignatureInContextOf(source, target, /*contextualMapper*/ undefined, compareTypes);
             }
-            var kind = target.declaration ? target.declaration.kind : 0;
-            var strictVariance = !callbackCheck && strictFunctionTypes && kind !== 154 &&
-                kind !== 153 && kind !== 155;
-            var result = -1;
+            var kind = target.declaration ? target.declaration.kind : 0 /* Unknown */;
+            var strictVariance = !callbackCheck && strictFunctionTypes && kind !== 154 /* MethodDeclaration */ &&
+                kind !== 153 /* MethodSignature */ && kind !== 155 /* Constructor */;
+            var result = -1 /* True */;
             var sourceThisType = getThisTypeOfSignature(source);
             if (sourceThisType && sourceThisType !== voidType) {
                 var targetThisType = getThisTypeOfSignature(target);
                 if (targetThisType) {
-                    var related = !strictVariance && compareTypes(sourceThisType, targetThisType, false)
+                    // void sources are assignable to anything.
+                    var related = !strictVariance && compareTypes(sourceThisType, targetThisType, /*reportErrors*/ false)
                         || compareTypes(targetThisType, sourceThisType, reportErrors);
                     if (!related) {
                         if (reportErrors) {
                             errorReporter(ts.Diagnostics.The_this_types_of_each_signature_are_incompatible);
                         }
-                        return 0;
+                        return 0 /* False */;
                     }
                     result &= related;
                 }
@@ -29570,18 +38269,27 @@ var ts;
             for (var i = 0; i < checkCount; i++) {
                 var sourceType = i < sourceMax ? getTypeOfParameter(sourceParams[i]) : getRestTypeOfSignature(source);
                 var targetType = i < targetMax ? getTypeOfParameter(targetParams[i]) : getRestTypeOfSignature(target);
+                // In order to ensure that any generic type Foo<T> is at least co-variant with respect to T no matter
+                // how Foo uses T, we need to relate parameters bi-variantly (given that parameters are input positions,
+                // they naturally relate only contra-variantly). However, if the source and target parameters both have
+                // function types with a single call signature, we know we are relating two callback parameters. In
+                // that case it is sufficient to only relate the parameters of the signatures co-variantly because,
+                // similar to return values, callback parameters are output positions. This means that a Promise<T>,
+                // where T is used only in callback parameter positions, will be co-variant (as opposed to bi-variant)
+                // with respect to T.
                 var sourceSig = callbackCheck ? undefined : getSingleCallSignature(getNonNullableType(sourceType));
                 var targetSig = callbackCheck ? undefined : getSingleCallSignature(getNonNullableType(targetType));
                 var callbacks = sourceSig && targetSig && !signatureHasTypePredicate(sourceSig) && !signatureHasTypePredicate(targetSig) &&
-                    (getFalsyFlags(sourceType) & 24576) === (getFalsyFlags(targetType) & 24576);
+                    (getFalsyFlags(sourceType) & 24576 /* Nullable */) === (getFalsyFlags(targetType) & 24576 /* Nullable */);
                 var related = callbacks ?
-                    compareSignaturesRelated(targetSig, sourceSig, strictVariance ? 2 : 1, false, reportErrors, errorReporter, compareTypes) :
-                    !callbackCheck && !strictVariance && compareTypes(sourceType, targetType, false) || compareTypes(targetType, sourceType, reportErrors);
+                    // TODO: GH#18217 It will work if they're both `undefined`, but not if only one is
+                    compareSignaturesRelated(targetSig, sourceSig, strictVariance ? 2 /* Strict */ : 1 /* Bivariant */, /*ignoreReturnTypes*/ false, reportErrors, errorReporter, compareTypes) :
+                    !callbackCheck && !strictVariance && compareTypes(sourceType, targetType, /*reportErrors*/ false) || compareTypes(targetType, sourceType, reportErrors);
                 if (!related) {
                     if (reportErrors) {
                         errorReporter(ts.Diagnostics.Types_of_parameters_0_and_1_are_incompatible, ts.symbolName(sourceParams[i < sourceMax ? i : sourceMax]), ts.symbolName(targetParams[i < targetMax ? i : targetMax]));
                     }
-                    return 0;
+                    return 0 /* False */;
                 }
                 result &= related;
             }
@@ -29591,21 +38299,25 @@ var ts;
                     return result;
                 }
                 var sourceReturnType = getReturnTypeOfSignature(source);
+                // The following block preserves behavior forbidding boolean returning functions from being assignable to type guard returning functions
                 var targetTypePredicate = getTypePredicateOfSignature(target);
                 if (targetTypePredicate) {
                     var sourceTypePredicate = getTypePredicateOfSignature(source);
                     if (sourceTypePredicate) {
-                        result &= compareTypePredicateRelatedTo(sourceTypePredicate, targetTypePredicate, source.declaration, target.declaration, reportErrors, errorReporter, compareTypes);
+                        result &= compareTypePredicateRelatedTo(sourceTypePredicate, targetTypePredicate, source.declaration, target.declaration, reportErrors, errorReporter, compareTypes); // TODO: GH#18217
                     }
                     else if (ts.isIdentifierTypePredicate(targetTypePredicate)) {
                         if (reportErrors) {
                             errorReporter(ts.Diagnostics.Signature_0_must_be_a_type_predicate, signatureToString(source));
                         }
-                        return 0;
+                        return 0 /* False */;
                     }
                 }
                 else {
-                    result &= callbackCheck === 1 && compareTypes(targetReturnType, sourceReturnType, false) ||
+                    // When relating callback signatures, we still need to relate return types bi-variantly as otherwise
+                    // the containing type wouldn't be co-variant. For example, interface Foo<T> { add(cb: () => T): void }
+                    // wouldn't be co-variant for T without this rule.
+                    result &= callbackCheck === 1 /* Bivariant */ && compareTypes(targetReturnType, sourceReturnType, /*reportErrors*/ false) ||
                         compareTypes(sourceReturnType, targetReturnType, reportErrors);
                 }
             }
@@ -29617,9 +38329,9 @@ var ts;
                     errorReporter(ts.Diagnostics.A_this_based_type_guard_is_not_compatible_with_a_parameter_based_type_guard);
                     errorReporter(ts.Diagnostics.Type_predicate_0_is_not_assignable_to_1, typePredicateToString(source), typePredicateToString(target));
                 }
-                return 0;
+                return 0 /* False */;
             }
-            if (source.kind === 1) {
+            if (source.kind === 1 /* Identifier */) {
                 var targetPredicate = target;
                 var sourceIndex = source.parameterIndex - (ts.getThisParameter(sourceDeclaration) ? 1 : 0);
                 var targetIndex = targetPredicate.parameterIndex - (ts.getThisParameter(targetDeclaration) ? 1 : 0);
@@ -29628,11 +38340,11 @@ var ts;
                         errorReporter(ts.Diagnostics.Parameter_0_is_not_in_the_same_position_as_parameter_1, source.parameterName, targetPredicate.parameterName);
                         errorReporter(ts.Diagnostics.Type_predicate_0_is_not_assignable_to_1, typePredicateToString(source), typePredicateToString(target));
                     }
-                    return 0;
+                    return 0 /* False */;
                 }
             }
             var related = compareTypes(source.type, target.type, reportErrors);
-            if (related === 0 && reportErrors) {
+            if (related === 0 /* False */ && reportErrors) {
                 errorReporter(ts.Diagnostics.Type_predicate_0_is_not_assignable_to_1, typePredicateToString(source), typePredicateToString(target));
             }
             return related;
@@ -29640,12 +38352,13 @@ var ts;
         function isImplementationCompatibleWithOverload(implementation, overload) {
             var erasedSource = getErasedSignature(implementation);
             var erasedTarget = getErasedSignature(overload);
+            // First see if the return types are compatible in either direction.
             var sourceReturnType = getReturnTypeOfSignature(erasedSource);
             var targetReturnType = getReturnTypeOfSignature(erasedTarget);
             if (targetReturnType === voidType
                 || isTypeRelatedTo(targetReturnType, sourceReturnType, assignableRelation)
                 || isTypeRelatedTo(sourceReturnType, targetReturnType, assignableRelation)) {
-                return isSignatureAssignableTo(erasedSource, erasedTarget, true);
+                return isSignatureAssignableTo(erasedSource, erasedTarget, /*ignoreReturnTypes*/ true);
             }
             return false;
         }
@@ -29658,6 +38371,8 @@ var ts;
         function getNumParametersToCheckForSignatureRelatability(source, sourceNonRestParamCount, target, targetNonRestParamCount) {
             if (source.hasRestParameter === target.hasRestParameter) {
                 if (source.hasRestParameter) {
+                    // If both have rest parameters, get the max and add 1 to
+                    // compensate for the rest parameter.
                     return Math.max(sourceNonRestParamCount, targetNonRestParamCount) + 1;
                 }
                 else {
@@ -29665,6 +38380,7 @@ var ts;
                 }
             }
             else {
+                // Return the count for whichever signature doesn't have rest parameters.
                 return source.hasRestParameter ?
                     targetNonRestParamCount :
                     sourceNonRestParamCount;
@@ -29678,10 +38394,10 @@ var ts;
                 !t.numberIndexInfo;
         }
         function isEmptyObjectType(type) {
-            return type.flags & 131072 ? isEmptyResolvedType(resolveStructuredTypeMembers(type)) :
-                type.flags & 16777216 ? true :
-                    type.flags & 262144 ? ts.some(type.types, isEmptyObjectType) :
-                        type.flags & 524288 ? !ts.some(type.types, function (t) { return !isEmptyObjectType(t); }) :
+            return type.flags & 131072 /* Object */ ? isEmptyResolvedType(resolveStructuredTypeMembers(type)) :
+                type.flags & 16777216 /* NonPrimitive */ ? true :
+                    type.flags & 262144 /* Union */ ? ts.some(type.types, isEmptyObjectType) :
+                        type.flags & 524288 /* Intersection */ ? ts.every(type.types, isEmptyObjectType) :
                             false;
         }
         function isEnumTypeRelatedTo(sourceSymbol, targetSymbol, errorReporter) {
@@ -29693,18 +38409,18 @@ var ts;
             if (relation !== undefined) {
                 return relation;
             }
-            if (sourceSymbol.escapedName !== targetSymbol.escapedName || !(sourceSymbol.flags & 256) || !(targetSymbol.flags & 256)) {
+            if (sourceSymbol.escapedName !== targetSymbol.escapedName || !(sourceSymbol.flags & 256 /* RegularEnum */) || !(targetSymbol.flags & 256 /* RegularEnum */)) {
                 enumRelation.set(id, false);
                 return false;
             }
             var targetEnumType = getTypeOfSymbol(targetSymbol);
             for (var _i = 0, _a = getPropertiesOfType(getTypeOfSymbol(sourceSymbol)); _i < _a.length; _i++) {
                 var property = _a[_i];
-                if (property.flags & 8) {
+                if (property.flags & 8 /* EnumMember */) {
                     var targetProperty = getPropertyOfType(targetEnumType, property.escapedName);
-                    if (!targetProperty || !(targetProperty.flags & 8)) {
+                    if (!targetProperty || !(targetProperty.flags & 8 /* EnumMember */)) {
                         if (errorReporter) {
-                            errorReporter(ts.Diagnostics.Property_0_is_missing_in_type_1, ts.symbolName(property), typeToString(getDeclaredTypeOfSymbol(targetSymbol), undefined, 64));
+                            errorReporter(ts.Diagnostics.Property_0_is_missing_in_type_1, ts.symbolName(property), typeToString(getDeclaredTypeOfSymbol(targetSymbol), /*enclosingDeclaration*/ undefined, 64 /* UseFullyQualifiedType */));
                         }
                         enumRelation.set(id, false);
                         return false;
@@ -29717,78 +38433,91 @@ var ts;
         function isSimpleTypeRelatedTo(source, target, relation, errorReporter) {
             var s = source.flags;
             var t = target.flags;
-            if (t & 3 || s & 32768 || source === wildcardType)
+            if (t & 3 /* AnyOrUnknown */ || s & 32768 /* Never */ || source === wildcardType)
                 return true;
-            if (t & 32768)
+            if (t & 32768 /* Never */)
                 return false;
-            if (s & 68 && t & 4)
+            if (s & 68 /* StringLike */ && t & 4 /* String */)
                 return true;
-            if (s & 64 && s & 512 &&
-                t & 64 && !(t & 512) &&
+            if (s & 64 /* StringLiteral */ && s & 512 /* EnumLiteral */ &&
+                t & 64 /* StringLiteral */ && !(t & 512 /* EnumLiteral */) &&
                 source.value === target.value)
                 return true;
-            if (s & 168 && t & 8)
+            if (s & 168 /* NumberLike */ && t & 8 /* Number */)
                 return true;
-            if (s & 128 && s & 512 &&
-                t & 128 && !(t & 512) &&
+            if (s & 128 /* NumberLiteral */ && s & 512 /* EnumLiteral */ &&
+                t & 128 /* NumberLiteral */ && !(t & 512 /* EnumLiteral */) &&
                 source.value === target.value)
                 return true;
-            if (s & 272 && t & 16)
+            if (s & 272 /* BooleanLike */ && t & 16 /* Boolean */)
                 return true;
-            if (s & 3072 && t & 1024)
+            if (s & 3072 /* ESSymbolLike */ && t & 1024 /* ESSymbol */)
                 return true;
-            if (s & 32 && t & 32 && isEnumTypeRelatedTo(source.symbol, target.symbol, errorReporter))
+            if (s & 32 /* Enum */ && t & 32 /* Enum */ && isEnumTypeRelatedTo(source.symbol, target.symbol, errorReporter))
                 return true;
-            if (s & 512 && t & 512) {
-                if (s & 262144 && t & 262144 && isEnumTypeRelatedTo(source.symbol, target.symbol, errorReporter))
+            if (s & 512 /* EnumLiteral */ && t & 512 /* EnumLiteral */) {
+                if (s & 262144 /* Union */ && t & 262144 /* Union */ && isEnumTypeRelatedTo(source.symbol, target.symbol, errorReporter))
                     return true;
-                if (s & 448 && t & 448 &&
+                if (s & 448 /* Literal */ && t & 448 /* Literal */ &&
                     source.value === target.value &&
                     isEnumTypeRelatedTo(getParentOfSymbol(source.symbol), getParentOfSymbol(target.symbol), errorReporter))
                     return true;
             }
-            if (s & 8192 && (!strictNullChecks || t & (8192 | 4096)))
+            if (s & 8192 /* Undefined */ && (!strictNullChecks || t & (8192 /* Undefined */ | 4096 /* Void */)))
                 return true;
-            if (s & 16384 && (!strictNullChecks || t & 16384))
+            if (s & 16384 /* Null */ && (!strictNullChecks || t & 16384 /* Null */))
                 return true;
-            if (s & 131072 && t & 16777216)
+            if (s & 131072 /* Object */ && t & 16777216 /* NonPrimitive */)
                 return true;
-            if (s & 2048 || t & 2048)
+            if (s & 2048 /* UniqueESSymbol */ || t & 2048 /* UniqueESSymbol */)
                 return false;
             if (relation === assignableRelation || relation === definitelyAssignableRelation || relation === comparableRelation) {
-                if (s & 1)
+                if (s & 1 /* Any */)
                     return true;
-                if (s & (8 | 128) && !(s & 512) && (t & 32 || t & 128 && t & 512))
+                // Type number or any numeric literal type is assignable to any numeric enum type or any
+                // numeric enum literal type. This rule exists for backwards compatibility reasons because
+                // bit-flag enum types sometimes look like literal enum types with numeric literal values.
+                if (s & (8 /* Number */ | 128 /* NumberLiteral */) && !(s & 512 /* EnumLiteral */) && (t & 32 /* Enum */ || t & 128 /* NumberLiteral */ && t & 512 /* EnumLiteral */))
                     return true;
             }
             return false;
         }
         function isTypeRelatedTo(source, target, relation) {
-            if (source.flags & 192 && source.flags & 33554432) {
+            if (source.flags & 192 /* StringOrNumberLiteral */ && source.flags & 33554432 /* FreshLiteral */) {
                 source = source.regularType;
             }
-            if (target.flags & 192 && target.flags & 33554432) {
+            if (target.flags & 192 /* StringOrNumberLiteral */ && target.flags & 33554432 /* FreshLiteral */) {
                 target = target.regularType;
             }
             if (source === target ||
-                relation === comparableRelation && !(target.flags & 32768) && isSimpleTypeRelatedTo(target, source, relation) ||
+                relation === comparableRelation && !(target.flags & 32768 /* Never */) && isSimpleTypeRelatedTo(target, source, relation) ||
                 relation !== identityRelation && isSimpleTypeRelatedTo(source, target, relation)) {
                 return true;
             }
-            if (source.flags & 131072 && target.flags & 131072) {
+            if (source.flags & 131072 /* Object */ && target.flags & 131072 /* Object */) {
                 var related = relation.get(getRelationKey(source, target, relation));
                 if (related !== undefined) {
-                    return related === 1;
+                    return related === 1 /* Succeeded */;
                 }
             }
-            if (source.flags & 16711680 || target.flags & 16711680) {
-                return checkTypeRelatedTo(source, target, relation, undefined);
+            if (source.flags & 16711680 /* StructuredOrInstantiable */ || target.flags & 16711680 /* StructuredOrInstantiable */) {
+                return checkTypeRelatedTo(source, target, relation, /*errorNode*/ undefined);
             }
             return false;
         }
         function isIgnoredJsxProperty(source, sourceProp, targetMemberType) {
-            return ts.getObjectFlags(source) & 4096 && !(isUnhyphenatedJsxName(sourceProp.escapedName) || targetMemberType);
+            return ts.getObjectFlags(source) & 4096 /* JsxAttributes */ && !(isUnhyphenatedJsxName(sourceProp.escapedName) || targetMemberType);
         }
+        /**
+         * Checks if 'source' is related to 'target' (e.g.: is a assignable to).
+         * @param source The left-hand-side of the relation.
+         * @param target The right-hand-side of the relation.
+         * @param relation The relation considered. One of 'identityRelation', 'subtypeRelation', 'assignableRelation', or 'comparableRelation'.
+         * Used as both to determine which checks are performed and as a cache of previously computed results.
+         * @param errorNode The suggested node upon which all errors will be reported, if defined. This may or may not be the actual node used.
+         * @param headMessage If the error chain should be prepended by a head message, then headMessage will be used.
+         * @param containingMessageChain A chain of errors to prepend any new errors found.
+         */
         function checkTypeRelatedTo(source, target, relation, errorNode, headMessage, containingMessageChain) {
             var errorInfo;
             var maybeKeys;
@@ -29796,11 +38525,11 @@ var ts;
             var targetStack;
             var maybeCount = 0;
             var depth = 0;
-            var expandingFlags = 0;
+            var expandingFlags = 0 /* None */;
             var overflow = false;
             var isIntersectionConstituent = false;
             ts.Debug.assert(relation !== identityRelation || !errorNode, "no error reporting in identity checking");
-            var result = isRelatedTo(source, target, !!errorNode, headMessage);
+            var result = isRelatedTo(source, target, /*reportErrors*/ !!errorNode, headMessage);
             if (overflow) {
                 error(errorNode, ts.Diagnostics.Excessive_stack_depth_comparing_types_0_and_1, typeToString(source), typeToString(target));
             }
@@ -29811,18 +38540,20 @@ var ts;
                         errorInfo = ts.concatenateDiagnosticMessageChains(chain_1, errorInfo);
                     }
                 }
-                diagnostics.add(ts.createDiagnosticForNodeFromMessageChain(errorNode, errorInfo));
+                diagnostics.add(ts.createDiagnosticForNodeFromMessageChain(errorNode, errorInfo)); // TODO: GH#18217
             }
+            // Check if we should issue an extra diagnostic to produce a quickfix for a slightly incorrect import statement
             if (headMessage && errorNode && !result && source.symbol) {
                 var links = getSymbolLinks(source.symbol);
                 if (links.originatingImport && !ts.isImportCall(links.originatingImport)) {
-                    var helpfulRetry = checkTypeRelatedTo(getTypeOfSymbol(links.target), target, relation, undefined);
+                    var helpfulRetry = checkTypeRelatedTo(getTypeOfSymbol(links.target), target, relation, /*errorNode*/ undefined);
                     if (helpfulRetry) {
+                        // Likely an incorrect import. Issue a helpful diagnostic to produce a quickfix to change the import
                         diagnostics.add(ts.createDiagnosticForNode(links.originatingImport, ts.Diagnostics.A_namespace_style_import_cannot_be_called_or_constructed_and_will_cause_a_failure_at_runtime));
                     }
                 }
             }
-            return result !== 0;
+            return result !== 0 /* False */;
             function reportError(message, arg0, arg1, arg2) {
                 ts.Debug.assert(!!errorNode);
                 errorInfo = ts.chainDiagnosticMessages(errorInfo, message, arg0, arg1, arg2);
@@ -29831,8 +38562,8 @@ var ts;
                 var sourceType = typeToString(source);
                 var targetType = typeToString(target);
                 if (sourceType === targetType) {
-                    sourceType = typeToString(source, undefined, 64);
-                    targetType = typeToString(target, undefined, 64);
+                    sourceType = typeToString(source, /*enclosingDeclaration*/ undefined, 64 /* UseFullyQualifiedType */);
+                    targetType = typeToString(target, /*enclosingDeclaration*/ undefined, 64 /* UseFullyQualifiedType */);
                 }
                 if (!message) {
                     if (relation === comparableRelation) {
@@ -29853,18 +38584,20 @@ var ts;
                 if ((globalStringType === source && stringType === target) ||
                     (globalNumberType === source && numberType === target) ||
                     (globalBooleanType === source && booleanType === target) ||
-                    (getGlobalESSymbolType(false) === source && esSymbolType === target)) {
+                    (getGlobalESSymbolType(/*reportErrors*/ false) === source && esSymbolType === target)) {
                     reportError(ts.Diagnostics._0_is_a_primitive_but_1_is_a_wrapper_object_Prefer_using_0_when_possible, targetType, sourceType);
                 }
             }
             function isUnionOrIntersectionTypeWithoutNullableConstituents(type) {
-                if (!(type.flags & 786432)) {
+                if (!(type.flags & 786432 /* UnionOrIntersection */)) {
                     return false;
                 }
+                // at this point we know that this is union or intersection type possibly with nullable constituents.
+                // check if we still will have compound type if we ignore nullable components.
                 var seenNonNullable = false;
                 for (var _i = 0, _a = type.types; _i < _a.length; _i++) {
                     var t = _a[_i];
-                    if (t.flags & 24576) {
+                    if (t.flags & 24576 /* Nullable */) {
                         continue;
                     }
                     if (seenNonNullable) {
@@ -29874,95 +38607,131 @@ var ts;
                 }
                 return false;
             }
+            /**
+             * Compare two types and return
+             * * Ternary.True if they are related with no assumptions,
+             * * Ternary.Maybe if they are related with assumptions of other relationships, or
+             * * Ternary.False if they are not related.
+             */
             function isRelatedTo(source, target, reportErrors, headMessage) {
                 if (reportErrors === void 0) { reportErrors = false; }
-                if (source.flags & 192 && source.flags & 33554432) {
+                if (source.flags & 192 /* StringOrNumberLiteral */ && source.flags & 33554432 /* FreshLiteral */) {
                     source = source.regularType;
                 }
-                if (target.flags & 192 && target.flags & 33554432) {
+                if (target.flags & 192 /* StringOrNumberLiteral */ && target.flags & 33554432 /* FreshLiteral */) {
                     target = target.regularType;
                 }
-                if (source.flags & 8388608) {
+                if (source.flags & 8388608 /* Substitution */) {
                     source = relation === definitelyAssignableRelation ? source.typeVariable : source.substitute;
                 }
-                if (target.flags & 8388608) {
+                if (target.flags & 8388608 /* Substitution */) {
                     target = target.typeVariable;
                 }
-                if (source.flags & 2097152) {
+                if (source.flags & 2097152 /* IndexedAccess */) {
                     source = getSimplifiedType(source);
                 }
-                if (target.flags & 2097152) {
+                if (target.flags & 2097152 /* IndexedAccess */) {
                     target = getSimplifiedType(target);
                 }
+                // both types are the same - covers 'they are the same primitive type or both are Any' or the same type parameter cases
                 if (source === target)
-                    return -1;
+                    return -1 /* True */;
                 if (relation === identityRelation) {
                     return isIdenticalTo(source, target);
                 }
-                if (relation === comparableRelation && !(target.flags & 32768) && isSimpleTypeRelatedTo(target, source, relation) ||
+                if (relation === comparableRelation && !(target.flags & 32768 /* Never */) && isSimpleTypeRelatedTo(target, source, relation) ||
                     isSimpleTypeRelatedTo(source, target, relation, reportErrors ? reportError : undefined))
-                    return -1;
-                if (isObjectLiteralType(source) && source.flags & 33554432) {
-                    var discriminantType = target.flags & 262144 ? findMatchingDiscriminantType(source, target) : undefined;
+                    return -1 /* True */;
+                if (isObjectLiteralType(source) && source.flags & 33554432 /* FreshLiteral */) {
+                    var discriminantType = target.flags & 262144 /* Union */ ? findMatchingDiscriminantType(source, target) : undefined;
                     if (hasExcessProperties(source, target, discriminantType, reportErrors)) {
                         if (reportErrors) {
                             reportRelationError(headMessage, source, target);
                         }
-                        return 0;
+                        return 0 /* False */;
                     }
+                    // Above we check for excess properties with respect to the entire target type. When union
+                    // and intersection types are further deconstructed on the target side, we don't want to
+                    // make the check again (as it might fail for a partial target type). Therefore we obtain
+                    // the regular source type and proceed with that.
                     if (isUnionOrIntersectionTypeWithoutNullableConstituents(target) && !discriminantType) {
                         source = getRegularTypeOfObjectLiteral(source);
                     }
                 }
                 if (relation !== comparableRelation &&
-                    !(source.flags & 786432) &&
-                    !(target.flags & 262144) &&
+                    !(source.flags & 786432 /* UnionOrIntersection */) &&
+                    !(target.flags & 262144 /* Union */) &&
                     !isIntersectionConstituent &&
                     source !== globalObjectType &&
                     (getPropertiesOfType(source).length > 0 || typeHasCallOrConstructSignatures(source)) &&
                     isWeakType(target) &&
                     !hasCommonProperties(source, target)) {
                     if (reportErrors) {
-                        var calls = getSignaturesOfType(source, 0);
-                        var constructs = getSignaturesOfType(source, 1);
-                        if (calls.length > 0 && isRelatedTo(getReturnTypeOfSignature(calls[0]), target, false) ||
-                            constructs.length > 0 && isRelatedTo(getReturnTypeOfSignature(constructs[0]), target, false)) {
+                        var calls = getSignaturesOfType(source, 0 /* Call */);
+                        var constructs = getSignaturesOfType(source, 1 /* Construct */);
+                        if (calls.length > 0 && isRelatedTo(getReturnTypeOfSignature(calls[0]), target, /*reportErrors*/ false) ||
+                            constructs.length > 0 && isRelatedTo(getReturnTypeOfSignature(constructs[0]), target, /*reportErrors*/ false)) {
                             reportError(ts.Diagnostics.Value_of_type_0_has_no_properties_in_common_with_type_1_Did_you_mean_to_call_it, typeToString(source), typeToString(target));
                         }
                         else {
                             reportError(ts.Diagnostics.Type_0_has_no_properties_in_common_with_type_1, typeToString(source), typeToString(target));
                         }
                     }
-                    return 0;
+                    return 0 /* False */;
                 }
-                var result = 0;
+                var result = 0 /* False */;
                 var saveErrorInfo = errorInfo;
                 var saveIsIntersectionConstituent = isIntersectionConstituent;
                 isIntersectionConstituent = false;
-                if (source.flags & 262144) {
+                // Note that these checks are specifically ordered to produce correct results. In particular,
+                // we need to deconstruct unions before intersections (because unions are always at the top),
+                // and we need to handle "each" relations before "some" relations for the same kind of type.
+                if (source.flags & 262144 /* Union */) {
                     result = relation === comparableRelation ?
-                        someTypeRelatedToType(source, target, reportErrors && !(source.flags & 32764)) :
-                        eachTypeRelatedToType(source, target, reportErrors && !(source.flags & 32764));
+                        someTypeRelatedToType(source, target, reportErrors && !(source.flags & 32764 /* Primitive */)) :
+                        eachTypeRelatedToType(source, target, reportErrors && !(source.flags & 32764 /* Primitive */));
                 }
                 else {
-                    if (target.flags & 262144) {
-                        result = typeRelatedToSomeType(source, target, reportErrors && !(source.flags & 32764) && !(target.flags & 32764));
+                    if (target.flags & 262144 /* Union */) {
+                        result = typeRelatedToSomeType(source, target, reportErrors && !(source.flags & 32764 /* Primitive */) && !(target.flags & 32764 /* Primitive */));
                     }
-                    else if (target.flags & 524288) {
+                    else if (target.flags & 524288 /* Intersection */) {
                         isIntersectionConstituent = true;
                         result = typeRelatedToEachType(source, target, reportErrors);
                     }
-                    else if (source.flags & 524288) {
-                        result = someTypeRelatedToType(source, target, false);
+                    else if (source.flags & 524288 /* Intersection */) {
+                        // Check to see if any constituents of the intersection are immediately related to the target.
+                        //
+                        // Don't report errors though. Checking whether a constituent is related to the source is not actually
+                        // useful and leads to some confusing error messages. Instead it is better to let the below checks
+                        // take care of this, or to not elaborate at all. For instance,
+                        //
+                        //    - For an object type (such as 'C = A & B'), users are usually more interested in structural errors.
+                        //
+                        //    - For a union type (such as '(A | B) = (C & D)'), it's better to hold onto the whole intersection
+                        //          than to report that 'D' is not assignable to 'A' or 'B'.
+                        //
+                        //    - For a primitive type or type parameter (such as 'number = A & B') there is no point in
+                        //          breaking the intersection apart.
+                        result = someTypeRelatedToType(source, target, /*reportErrors*/ false);
                     }
-                    if (!result && (source.flags & 16711680 || target.flags & 16711680)) {
+                    if (!result && (source.flags & 16711680 /* StructuredOrInstantiable */ || target.flags & 16711680 /* StructuredOrInstantiable */)) {
                         if (result = recursiveTypeRelatedTo(source, target, reportErrors)) {
                             errorInfo = saveErrorInfo;
                         }
                     }
                 }
-                if (!result && source.flags & 524288) {
-                    var constraint = getUnionConstraintOfIntersection(source, !!(target.flags & 262144));
+                if (!result && source.flags & 524288 /* Intersection */) {
+                    // The combined constraint of an intersection type is the intersection of the constraints of
+                    // the constituents. When an intersection type contains instantiable types with union type
+                    // constraints, there are situations where we need to examine the combined constraint. One is
+                    // when the target is a union type. Another is when the intersection contains types belonging
+                    // to one of the disjoint domains. For example, given type variables T and U, each with the
+                    // constraint 'string | number', the combined constraint of 'T & U' is 'string | number' and
+                    // we need to check this constraint against a union on the target side. Also, given a type
+                    // variable V constrained to 'string | number', 'V & number' has a combined constraint of
+                    // 'string & number | number & number' which reduces to just 'number'.
+                    var constraint = getUnionConstraintOfIntersection(source, !!(target.flags & 262144 /* Union */));
                     if (constraint) {
                         if (result = isRelatedTo(constraint, target, reportErrors)) {
                             errorInfo = saveErrorInfo;
@@ -29971,18 +38740,19 @@ var ts;
                 }
                 isIntersectionConstituent = saveIsIntersectionConstituent;
                 if (!result && reportErrors) {
-                    if (source.flags & 131072 && target.flags & 32764) {
+                    if (source.flags & 131072 /* Object */ && target.flags & 32764 /* Primitive */) {
                         tryElaborateErrorsForPrimitivesAndObjects(source, target);
                     }
-                    else if (source.symbol && source.flags & 131072 && globalObjectType === source) {
+                    else if (source.symbol && source.flags & 131072 /* Object */ && globalObjectType === source) {
                         reportError(ts.Diagnostics.The_Object_type_is_assignable_to_very_few_other_types_Did_you_mean_to_use_the_any_type_instead);
                     }
-                    else if (ts.getObjectFlags(source) & 4096 && target.flags & 524288) {
+                    else if (ts.getObjectFlags(source) & 4096 /* JsxAttributes */ && target.flags & 524288 /* Intersection */) {
                         var targetTypes = target.types;
                         var intrinsicAttributes = getJsxType(JsxNames.IntrinsicAttributes, errorNode);
                         var intrinsicClassAttributes = getJsxType(JsxNames.IntrinsicClassAttributes, errorNode);
                         if (intrinsicAttributes !== errorType && intrinsicClassAttributes !== errorType &&
                             (ts.contains(targetTypes, intrinsicAttributes) || ts.contains(targetTypes, intrinsicClassAttributes))) {
+                            // do not report top error
                             return result;
                         }
                     }
@@ -29993,32 +38763,32 @@ var ts;
             function isIdenticalTo(source, target) {
                 var result;
                 var flags = source.flags & target.flags;
-                if (flags & 131072) {
-                    return recursiveTypeRelatedTo(source, target, false);
+                if (flags & 131072 /* Object */) {
+                    return recursiveTypeRelatedTo(source, target, /*reportErrors*/ false);
                 }
-                if (flags & (262144 | 524288)) {
+                if (flags & (262144 /* Union */ | 524288 /* Intersection */)) {
                     if (result = eachTypeRelatedToSomeType(source, target)) {
                         if (result &= eachTypeRelatedToSomeType(target, source)) {
                             return result;
                         }
                     }
                 }
-                if (flags & 1048576) {
-                    return isRelatedTo(source.type, target.type, false);
+                if (flags & 1048576 /* Index */) {
+                    return isRelatedTo(source.type, target.type, /*reportErrors*/ false);
                 }
-                if (flags & 2097152) {
-                    if (result = isRelatedTo(source.objectType, target.objectType, false)) {
-                        if (result &= isRelatedTo(source.indexType, target.indexType, false)) {
+                if (flags & 2097152 /* IndexedAccess */) {
+                    if (result = isRelatedTo(source.objectType, target.objectType, /*reportErrors*/ false)) {
+                        if (result &= isRelatedTo(source.indexType, target.indexType, /*reportErrors*/ false)) {
                             return result;
                         }
                     }
                 }
-                if (flags & 4194304) {
+                if (flags & 4194304 /* Conditional */) {
                     if (source.root.isDistributive === target.root.isDistributive) {
-                        if (result = isRelatedTo(source.checkType, target.checkType, false)) {
-                            if (result &= isRelatedTo(source.extendsType, target.extendsType, false)) {
-                                if (result &= isRelatedTo(getTrueTypeFromConditionalType(source), getTrueTypeFromConditionalType(target), false)) {
-                                    if (result &= isRelatedTo(getFalseTypeFromConditionalType(source), getFalseTypeFromConditionalType(target), false)) {
+                        if (result = isRelatedTo(source.checkType, target.checkType, /*reportErrors*/ false)) {
+                            if (result &= isRelatedTo(source.extendsType, target.extendsType, /*reportErrors*/ false)) {
+                                if (result &= isRelatedTo(getTrueTypeFromConditionalType(source), getTrueTypeFromConditionalType(target), /*reportErrors*/ false)) {
+                                    if (result &= isRelatedTo(getFalseTypeFromConditionalType(source), getFalseTypeFromConditionalType(target), /*reportErrors*/ false)) {
                                         return result;
                                     }
                                 }
@@ -30026,30 +38796,37 @@ var ts;
                         }
                     }
                 }
-                if (flags & 8388608) {
-                    return isRelatedTo(source.substitute, target.substitute, false);
+                if (flags & 8388608 /* Substitution */) {
+                    return isRelatedTo(source.substitute, target.substitute, /*reportErrors*/ false);
                 }
-                return 0;
+                return 0 /* False */;
             }
             function hasExcessProperties(source, target, discriminant, reportErrors) {
-                if (maybeTypeOfKind(target, 131072) && !(ts.getObjectFlags(target) & 512)) {
-                    var isComparingJsxAttributes = !!(ts.getObjectFlags(source) & 4096);
+                if (maybeTypeOfKind(target, 131072 /* Object */) && !(ts.getObjectFlags(target) & 512 /* ObjectLiteralPatternWithComputedProperties */)) {
+                    var isComparingJsxAttributes = !!(ts.getObjectFlags(source) & 4096 /* JsxAttributes */);
                     if ((relation === assignableRelation || relation === definitelyAssignableRelation || relation === comparableRelation) &&
                         (isTypeSubsetOf(globalObjectType, target) || (!isComparingJsxAttributes && isEmptyObjectType(target)))) {
                         return false;
                     }
                     if (discriminant) {
-                        return hasExcessProperties(source, discriminant, undefined, reportErrors);
+                        // check excess properties against discriminant type only, not the entire union
+                        return hasExcessProperties(source, discriminant, /*discriminant*/ undefined, reportErrors);
                     }
-                    var _loop_6 = function (prop) {
+                    var _loop_4 = function (prop) {
                         if (!isKnownProperty(target, prop.escapedName, isComparingJsxAttributes)) {
                             if (reportErrors) {
+                                // We know *exactly* where things went wrong when comparing the types.
+                                // Use this property as the error node as this will be more helpful in
+                                // reasoning about what went wrong.
                                 if (!errorNode)
                                     return { value: ts.Debug.fail() };
                                 if (ts.isJsxAttributes(errorNode) || ts.isJsxOpeningLikeElement(errorNode)) {
+                                    // JsxAttributes has an object-literal flag and undergo same type-assignablity check as normal object-literal.
+                                    // However, using an object-literal error message will be very confusing to the users so we give different a message.
                                     reportError(ts.Diagnostics.Property_0_does_not_exist_on_type_1, symbolToString(prop), typeToString(target));
                                 }
                                 else {
+                                    // use the property's value declaration if the property is assigned inside the literal itself
                                     var objectLiteralDeclaration_1 = source.symbol && ts.firstOrUndefined(source.symbol.declarations);
                                     var suggestion = void 0;
                                     if (prop.valueDeclaration && ts.findAncestor(prop.valueDeclaration, function (d) { return d === objectLiteralDeclaration_1; })) {
@@ -30074,7 +38851,7 @@ var ts;
                     };
                     for (var _i = 0, _a = getPropertiesOfObjectType(source); _i < _a.length; _i++) {
                         var prop = _a[_i];
-                        var state_3 = _loop_6(prop);
+                        var state_3 = _loop_4(prop);
                         if (typeof state_3 === "object")
                             return state_3.value;
                     }
@@ -30082,13 +38859,13 @@ var ts;
                 return false;
             }
             function eachTypeRelatedToSomeType(source, target) {
-                var result = -1;
+                var result = -1 /* True */;
                 var sourceTypes = source.types;
                 for (var _i = 0, sourceTypes_1 = sourceTypes; _i < sourceTypes_1.length; _i++) {
                     var sourceType = sourceTypes_1[_i];
-                    var related = typeRelatedToSomeType(sourceType, target, false);
+                    var related = typeRelatedToSomeType(sourceType, target, /*reportErrors*/ false);
                     if (!related) {
-                        return 0;
+                        return 0 /* False */;
                     }
                     result &= related;
                 }
@@ -30096,22 +38873,23 @@ var ts;
             }
             function typeRelatedToSomeType(source, target, reportErrors) {
                 var targetTypes = target.types;
-                if (target.flags & 262144 && containsType(targetTypes, source)) {
-                    return -1;
+                if (target.flags & 262144 /* Union */ && containsType(targetTypes, source)) {
+                    return -1 /* True */;
                 }
                 for (var _i = 0, targetTypes_1 = targetTypes; _i < targetTypes_1.length; _i++) {
                     var type = targetTypes_1[_i];
-                    var related = isRelatedTo(source, type, false);
+                    var related = isRelatedTo(source, type, /*reportErrors*/ false);
                     if (related) {
                         return related;
                     }
                 }
                 if (reportErrors) {
                     var discriminantType = findMatchingDiscriminantType(source, target);
-                    isRelatedTo(source, discriminantType || targetTypes[targetTypes.length - 1], true);
+                    isRelatedTo(source, discriminantType || targetTypes[targetTypes.length - 1], /*reportErrors*/ true);
                 }
-                return 0;
+                return 0 /* False */;
             }
+            // Keep this up-to-date with the same logic within `getApparentTypeOfContextualType`, since they should behave similarly
             function findMatchingDiscriminantType(source, target) {
                 var match;
                 var sourceProperties = getPropertiesOfObjectType(source);
@@ -30126,7 +38904,7 @@ var ts;
                                 var targetType = getTypeOfPropertyOfType(type, sourceProperty.escapedName);
                                 if (targetType && isRelatedTo(sourceType, targetType)) {
                                     if (type === match)
-                                        continue;
+                                        continue; // Finding multiple fields which discriminate to the same type is fine
                                     if (match) {
                                         return undefined;
                                     }
@@ -30139,13 +38917,13 @@ var ts;
                 return match;
             }
             function typeRelatedToEachType(source, target, reportErrors) {
-                var result = -1;
+                var result = -1 /* True */;
                 var targetTypes = target.types;
                 for (var _i = 0, targetTypes_2 = targetTypes; _i < targetTypes_2.length; _i++) {
                     var targetType = targetTypes_2[_i];
                     var related = isRelatedTo(source, targetType, reportErrors);
                     if (!related) {
-                        return 0;
+                        return 0 /* False */;
                     }
                     result &= related;
                 }
@@ -30153,8 +38931,8 @@ var ts;
             }
             function someTypeRelatedToType(source, target, reportErrors) {
                 var sourceTypes = source.types;
-                if (source.flags & 262144 && containsType(sourceTypes, target)) {
-                    return -1;
+                if (source.flags & 262144 /* Union */ && containsType(sourceTypes, target)) {
+                    return -1 /* True */;
                 }
                 var len = sourceTypes.length;
                 for (var i = 0; i < len; i++) {
@@ -30163,16 +38941,16 @@ var ts;
                         return related;
                     }
                 }
-                return 0;
+                return 0 /* False */;
             }
             function eachTypeRelatedToType(source, target, reportErrors) {
-                var result = -1;
+                var result = -1 /* True */;
                 var sourceTypes = source.types;
                 for (var _i = 0, sourceTypes_2 = sourceTypes; _i < sourceTypes_2.length; _i++) {
                     var sourceType = sourceTypes_2[_i];
                     var related = isRelatedTo(sourceType, target, reportErrors);
                     if (!related) {
-                        return 0;
+                        return 0 /* False */;
                     }
                     result &= related;
                 }
@@ -30182,54 +38960,72 @@ var ts;
                 var sources = source.typeArguments || ts.emptyArray;
                 var targets = target.typeArguments || ts.emptyArray;
                 if (sources.length !== targets.length && relation === identityRelation) {
-                    return 0;
+                    return 0 /* False */;
                 }
                 var length = sources.length <= targets.length ? sources.length : targets.length;
-                var result = -1;
+                var result = -1 /* True */;
                 for (var i = 0; i < length; i++) {
-                    var variance = i < variances.length ? variances[i] : 1;
-                    if (variance !== 4) {
+                    // When variance information isn't available we default to covariance. This happens
+                    // in the process of computing variance information for recursive types and when
+                    // comparing 'this' type arguments.
+                    var variance = i < variances.length ? variances[i] : 1 /* Covariant */;
+                    // We ignore arguments for independent type parameters (because they're never witnessed).
+                    if (variance !== 4 /* Independent */) {
                         var s = sources[i];
                         var t = targets[i];
-                        var related = -1;
-                        if (variance === 1) {
+                        var related = -1 /* True */;
+                        if (variance === 1 /* Covariant */) {
                             related = isRelatedTo(s, t, reportErrors);
                         }
-                        else if (variance === 2) {
+                        else if (variance === 2 /* Contravariant */) {
                             related = isRelatedTo(t, s, reportErrors);
                         }
-                        else if (variance === 3) {
-                            related = isRelatedTo(t, s, false);
+                        else if (variance === 3 /* Bivariant */) {
+                            // In the bivariant case we first compare contravariantly without reporting
+                            // errors. Then, if that doesn't succeed, we compare covariantly with error
+                            // reporting. Thus, error elaboration will be based on the the covariant check,
+                            // which is generally easier to reason about.
+                            related = isRelatedTo(t, s, /*reportErrors*/ false);
                             if (!related) {
                                 related = isRelatedTo(s, t, reportErrors);
                             }
                         }
                         else {
+                            // In the invariant case we first compare covariantly, and only when that
+                            // succeeds do we proceed to compare contravariantly. Thus, error elaboration
+                            // will typically be based on the covariant check.
                             related = isRelatedTo(s, t, reportErrors);
                             if (related) {
                                 related &= isRelatedTo(t, s, reportErrors);
                             }
                         }
                         if (!related) {
-                            return 0;
+                            return 0 /* False */;
                         }
                         result &= related;
                     }
                 }
                 return result;
             }
+            // Determine if possibly recursive types are related. First, check if the result is already available in the global cache.
+            // Second, check if we have already started a comparison of the given two types in which case we assume the result to be true.
+            // Third, check if both types are part of deeply nested chains of generic type instantiations and if so assume the types are
+            // equal and infinitely expanding. Fourth, if we have reached a depth of 100 nested comparisons, assume we have runaway recursion
+            // and issue an error. Otherwise, actually compare the structure of the two types.
             function recursiveTypeRelatedTo(source, target, reportErrors) {
                 if (overflow) {
-                    return 0;
+                    return 0 /* False */;
                 }
                 var id = getRelationKey(source, target, relation);
                 var related = relation.get(id);
                 if (related !== undefined) {
-                    if (reportErrors && related === 2) {
-                        relation.set(id, 3);
+                    if (reportErrors && related === 2 /* Failed */) {
+                        // We are elaborating errors and the cached result is an unreported failure. Record the result as a reported
+                        // failure and continue computing the relation such that errors get reported.
+                        relation.set(id, 3 /* FailedAndReported */);
                     }
                     else {
-                        return related === 1 ? -1 : 0;
+                        return related === 1 /* Succeeded */ ? -1 /* True */ : 0 /* False */;
                     }
                 }
                 if (!maybeKeys) {
@@ -30239,13 +39035,14 @@ var ts;
                 }
                 else {
                     for (var i = 0; i < maybeCount; i++) {
+                        // If source and target are already being compared, consider them related with assumptions
                         if (id === maybeKeys[i]) {
-                            return 1;
+                            return 1 /* Maybe */;
                         }
                     }
                     if (depth === 100) {
                         overflow = true;
-                        return 0;
+                        return 0 /* False */;
                     }
                 }
                 var maybeStart = maybeCount;
@@ -30255,23 +39052,26 @@ var ts;
                 targetStack[depth] = target;
                 depth++;
                 var saveExpandingFlags = expandingFlags;
-                if (!(expandingFlags & 1) && isDeeplyNestedType(source, sourceStack, depth))
-                    expandingFlags |= 1;
-                if (!(expandingFlags & 2) && isDeeplyNestedType(target, targetStack, depth))
-                    expandingFlags |= 2;
-                var result = expandingFlags !== 3 ? structuredTypeRelatedTo(source, target, reportErrors) : 1;
+                if (!(expandingFlags & 1 /* Source */) && isDeeplyNestedType(source, sourceStack, depth))
+                    expandingFlags |= 1 /* Source */;
+                if (!(expandingFlags & 2 /* Target */) && isDeeplyNestedType(target, targetStack, depth))
+                    expandingFlags |= 2 /* Target */;
+                var result = expandingFlags !== 3 /* Both */ ? structuredTypeRelatedTo(source, target, reportErrors) : 1 /* Maybe */;
                 expandingFlags = saveExpandingFlags;
                 depth--;
                 if (result) {
-                    if (result === -1 || depth === 0) {
+                    if (result === -1 /* True */ || depth === 0) {
+                        // If result is definitely true, record all maybe keys as having succeeded
                         for (var i = maybeStart; i < maybeCount; i++) {
-                            relation.set(maybeKeys[i], 1);
+                            relation.set(maybeKeys[i], 1 /* Succeeded */);
                         }
                         maybeCount = maybeStart;
                     }
                 }
                 else {
-                    relation.set(id, reportErrors ? 3 : 2);
+                    // A false result goes straight into global cache (when something is false under
+                    // assumptions it will also be false without assumptions)
+                    relation.set(id, reportErrors ? 3 /* FailedAndReported */ : 2 /* Failed */);
                     maybeCount = maybeStart;
                 }
                 return result;
@@ -30283,9 +39083,10 @@ var ts;
                 var result;
                 var originalErrorInfo;
                 var saveErrorInfo = errorInfo;
-                if (target.flags & 65536) {
-                    if (ts.getObjectFlags(source) & 32 && getConstraintTypeFromMappedType(source) === getIndexType(target)) {
-                        if (!(getMappedTypeModifiers(source) & 4)) {
+                if (target.flags & 65536 /* TypeParameter */) {
+                    // A source type { [P in keyof T]: X } is related to a target type T if X is related to T[P].
+                    if (ts.getObjectFlags(source) & 32 /* Mapped */ && getConstraintTypeFromMappedType(source) === getIndexType(target)) {
+                        if (!(getMappedTypeModifiers(source) & 4 /* IncludeOptional */)) {
                             var templateType = getTemplateTypeFromMappedType(source);
                             var indexedAccessType = getIndexedAccessType(target, getTypeParameterFromMappedType(source));
                             if (result = isRelatedTo(templateType, indexedAccessType, reportErrors)) {
@@ -30294,12 +39095,15 @@ var ts;
                         }
                     }
                 }
-                else if (target.flags & 1048576) {
-                    if (source.flags & 1048576) {
-                        if (result = isRelatedTo(target.type, source.type, false)) {
+                else if (target.flags & 1048576 /* Index */) {
+                    // A keyof S is related to a keyof T if T is related to S.
+                    if (source.flags & 1048576 /* Index */) {
+                        if (result = isRelatedTo(target.type, source.type, /*reportErrors*/ false)) {
                             return result;
                         }
                     }
+                    // A type S is assignable to keyof T if S is assignable to keyof C, where C is the
+                    // simplified form of T or, if T doesn't simplify, the constraint of T.
                     if (relation !== definitelyAssignableRelation) {
                         var simplified = getSimplifiedType(target.type);
                         var constraint = simplified !== target.type ? simplified : getConstraintOfType(target.type);
@@ -30310,7 +39114,9 @@ var ts;
                         }
                     }
                 }
-                else if (target.flags & 2097152) {
+                else if (target.flags & 2097152 /* IndexedAccess */) {
+                    // A type S is related to a type T[K] if S is related to C, where C is the
+                    // constraint of T[K]
                     var constraint = getConstraintForRelation(target);
                     if (constraint) {
                         if (result = isRelatedTo(source, constraint, reportErrors)) {
@@ -30320,13 +39126,15 @@ var ts;
                     }
                 }
                 else if (isGenericMappedType(target)) {
+                    // A source type T is related to a target type { [P in X]: T[P] }
                     var template = getTemplateTypeFromMappedType(target);
                     var modifiers = getMappedTypeModifiers(target);
-                    if (!(modifiers & 8)) {
-                        if (template.flags & 2097152 && template.objectType === source &&
+                    if (!(modifiers & 8 /* ExcludeOptional */)) {
+                        if (template.flags & 2097152 /* IndexedAccess */ && template.objectType === source &&
                             template.indexType === getTypeParameterFromMappedType(target)) {
-                            return -1;
+                            return -1 /* True */;
                         }
+                        // A source type T is related to a target type { [P in keyof T]: X } if T[P] is related to X.
                         if (!isGenericMappedType(source) && getConstraintTypeFromMappedType(target) === getIndexType(source)) {
                             var indexedAccessType = getIndexedAccessType(source, getTypeParameterFromMappedType(target));
                             var templateType = getTemplateTypeFromMappedType(target);
@@ -30337,8 +39145,9 @@ var ts;
                         }
                     }
                 }
-                if (source.flags & 2162688) {
-                    if (source.flags & 2097152 && target.flags & 2097152) {
+                if (source.flags & 2162688 /* TypeVariable */) {
+                    if (source.flags & 2097152 /* IndexedAccess */ && target.flags & 2097152 /* IndexedAccess */) {
+                        // A type S[K] is related to a type T[J] if S is related to T and K is related to J.
                         if (result = isRelatedTo(source.objectType, target.objectType, reportErrors)) {
                             result &= isRelatedTo(source.indexType, target.indexType, reportErrors);
                         }
@@ -30348,8 +39157,9 @@ var ts;
                         }
                     }
                     var constraint = getConstraintForRelation(source);
-                    if (!constraint || (source.flags & 65536 && constraint.flags & 3)) {
-                        if (result = isRelatedTo(emptyObjectType, extractTypesOfKind(target, ~16777216))) {
+                    if (!constraint || (source.flags & 65536 /* TypeParameter */ && constraint.flags & 3 /* AnyOrUnknown */)) {
+                        // A type variable with no constraint is not related to the non-primitive object type.
+                        if (result = isRelatedTo(emptyObjectType, extractTypesOfKind(target, ~16777216 /* NonPrimitive */))) {
                             errorInfo = saveErrorInfo;
                             return result;
                         }
@@ -30362,14 +39172,17 @@ var ts;
                         }
                     }
                 }
-                else if (source.flags & 1048576) {
+                else if (source.flags & 1048576 /* Index */) {
                     if (result = isRelatedTo(keyofConstraintType, target, reportErrors)) {
                         errorInfo = saveErrorInfo;
                         return result;
                     }
                 }
-                else if (source.flags & 4194304) {
-                    if (target.flags & 4194304) {
+                else if (source.flags & 4194304 /* Conditional */) {
+                    if (target.flags & 4194304 /* Conditional */) {
+                        // Two conditional types 'T1 extends U1 ? X1 : Y1' and 'T2 extends U2 ? X2 : Y2' are related if
+                        // one of T1 and T2 is related to the other, U1 and U2 are identical types, X1 is related to X2,
+                        // and Y1 is related to Y2.
                         if (isTypeIdenticalTo(source.extendsType, target.extendsType) &&
                             (isRelatedTo(source.checkType, target.checkType) || isRelatedTo(target.checkType, source.checkType))) {
                             if (result = isRelatedTo(getTrueTypeFromConditionalType(source), getTrueTypeFromConditionalType(target), reportErrors)) {
@@ -30399,42 +39212,68 @@ var ts;
                     }
                 }
                 else {
-                    if (ts.getObjectFlags(source) & 4 && ts.getObjectFlags(target) & 4 && source.target === target.target &&
-                        !(ts.getObjectFlags(source) & 8192 || ts.getObjectFlags(target) & 8192)) {
+                    if (ts.getObjectFlags(source) & 4 /* Reference */ && ts.getObjectFlags(target) & 4 /* Reference */ && source.target === target.target &&
+                        !(ts.getObjectFlags(source) & 8192 /* MarkerType */ || ts.getObjectFlags(target) & 8192 /* MarkerType */)) {
+                        // We have type references to the same generic type, and the type references are not marker
+                        // type references (which are intended by be compared structurally). Obtain the variance
+                        // information for the type parameters and relate the type arguments accordingly.
                         var variances = getVariances(source.target);
                         if (result = typeArgumentsRelatedTo(source, target, variances, reportErrors)) {
                             return result;
                         }
+                        // The type arguments did not relate appropriately, but it may be because we have no variance
+                        // information (in which case typeArgumentsRelatedTo defaulted to covariance for all type
+                        // arguments). It might also be the case that the target type has a 'void' type argument for
+                        // a covariant type parameter that is only used in return positions within the generic type
+                        // (in which case any type argument is permitted on the source side). In those cases we proceed
+                        // with a structural comparison. Otherwise, we know for certain the instantiations aren't
+                        // related and we can return here.
                         if (variances !== ts.emptyArray && !hasCovariantVoidArgument(target, variances)) {
-                            if (!(reportErrors && ts.some(variances, function (v) { return v === 0; }))) {
-                                return 0;
+                            // In some cases generic types that are covariant in regular type checking mode become
+                            // invariant in --strictFunctionTypes mode because one or more type parameters are used in
+                            // both co- and contravariant positions. In order to make it easier to diagnose *why* such
+                            // types are invariant, if any of the type parameters are invariant we reset the reported
+                            // errors and instead force a structural comparison (which will include elaborations that
+                            // reveal the reason).
+                            if (!(reportErrors && ts.some(variances, function (v) { return v === 0 /* Invariant */; }))) {
+                                return 0 /* False */;
                             }
+                            // We remember the original error information so we can restore it in case the structural
+                            // comparison unexpectedly succeeds. This can happen when the structural comparison result
+                            // is a Ternary.Maybe for example caused by the recursion depth limiter.
                             originalErrorInfo = errorInfo;
                             errorInfo = saveErrorInfo;
                         }
                     }
-                    var sourceIsPrimitive = !!(source.flags & 32764);
+                    // Even if relationship doesn't hold for unions, intersections, or generic type references,
+                    // it may hold in a structural comparison.
+                    var sourceIsPrimitive = !!(source.flags & 32764 /* Primitive */);
                     if (relation !== identityRelation) {
                         source = getApparentType(source);
                     }
-                    if (source.flags & (131072 | 524288) && target.flags & 131072) {
+                    // In a check of the form X = A & B, we will have previously checked if A relates to X or B relates
+                    // to X. Failing both of those we want to check if the aggregation of A and B's members structurally
+                    // relates to X. Thus, we include intersection types on the source side here.
+                    if (source.flags & (131072 /* Object */ | 524288 /* Intersection */) && target.flags & 131072 /* Object */) {
+                        // Report structural errors only if we haven't reported any errors yet
                         var reportStructuralErrors = reportErrors && errorInfo === saveErrorInfo && !sourceIsPrimitive;
+                        // An empty object type is related to any mapped type that includes a '?' modifier.
                         if (isPartialMappedType(target) && !isGenericMappedType(source) && isEmptyObjectType(source)) {
-                            result = -1;
+                            result = -1 /* True */;
                         }
                         else if (isGenericMappedType(target)) {
-                            result = isGenericMappedType(source) ? mappedTypeRelatedTo(source, target, reportStructuralErrors) : 0;
+                            result = isGenericMappedType(source) ? mappedTypeRelatedTo(source, target, reportStructuralErrors) : 0 /* False */;
                         }
                         else {
                             result = propertiesRelatedTo(source, target, reportStructuralErrors);
                             if (result) {
-                                result &= signaturesRelatedTo(source, target, 0, reportStructuralErrors);
+                                result &= signaturesRelatedTo(source, target, 0 /* Call */, reportStructuralErrors);
                                 if (result) {
-                                    result &= signaturesRelatedTo(source, target, 1, reportStructuralErrors);
+                                    result &= signaturesRelatedTo(source, target, 1 /* Construct */, reportStructuralErrors);
                                     if (result) {
-                                        result &= indexTypesRelatedTo(source, target, 0, sourceIsPrimitive, reportStructuralErrors);
+                                        result &= indexTypesRelatedTo(source, target, 0 /* String */, sourceIsPrimitive, reportStructuralErrors);
                                         if (result) {
-                                            result &= indexTypesRelatedTo(source, target, 1, sourceIsPrimitive, reportStructuralErrors);
+                                            result &= indexTypesRelatedTo(source, target, 1 /* Number */, sourceIsPrimitive, reportStructuralErrors);
                                         }
                                     }
                                 }
@@ -30449,19 +39288,22 @@ var ts;
                         }
                     }
                 }
-                return 0;
+                return 0 /* False */;
             }
+            // A type [P in S]: X is related to a type [Q in T]: Y if T is related to S and X' is
+            // related to Y, where X' is an instantiation of X in which P is replaced with Q. Notice
+            // that S and T are contra-variant whereas X and Y are co-variant.
             function mappedTypeRelatedTo(source, target, reportErrors) {
                 var modifiersRelated = relation === comparableRelation || (relation === identityRelation ? getMappedTypeModifiers(source) === getMappedTypeModifiers(target) :
                     getCombinedMappedTypeOptionality(source) <= getCombinedMappedTypeOptionality(target));
                 if (modifiersRelated) {
-                    var result_2;
-                    if (result_2 = isRelatedTo(getConstraintTypeFromMappedType(target), getConstraintTypeFromMappedType(source), reportErrors)) {
+                    var result_1;
+                    if (result_1 = isRelatedTo(getConstraintTypeFromMappedType(target), getConstraintTypeFromMappedType(source), reportErrors)) {
                         var mapper = createTypeMapper([getTypeParameterFromMappedType(source)], [getTypeParameterFromMappedType(target)]);
-                        return result_2 & isRelatedTo(instantiateType(getTemplateTypeFromMappedType(source), mapper), getTemplateTypeFromMappedType(target), reportErrors);
+                        return result_1 & isRelatedTo(instantiateType(getTemplateTypeFromMappedType(source), mapper), getTemplateTypeFromMappedType(target), reportErrors);
                     }
                 }
-                return 0;
+                return 0 /* False */;
             }
             function propertiesRelatedTo(source, target, reportErrors) {
                 if (relation === identityRelation) {
@@ -30473,7 +39315,7 @@ var ts;
                     if (reportErrors) {
                         reportError(ts.Diagnostics.Property_0_is_missing_in_type_1, symbolToString(unmatchedProperty), typeToString(source));
                     }
-                    return 0;
+                    return 0 /* False */;
                 }
                 if (isObjectLiteralType(target)) {
                     for (var _i = 0, _a = getPropertiesOfType(source); _i < _a.length; _i++) {
@@ -30484,16 +39326,16 @@ var ts;
                                 if (reportErrors) {
                                     reportError(ts.Diagnostics.Property_0_does_not_exist_on_type_1, symbolToString(sourceProp), typeToString(target));
                                 }
-                                return 0;
+                                return 0 /* False */;
                             }
                         }
                     }
                 }
-                var result = -1;
+                var result = -1 /* True */;
                 var properties = getPropertiesOfObjectType(target);
                 for (var _b = 0, properties_3 = properties; _b < properties_3.length; _b++) {
                     var targetProp = properties_3[_b];
-                    if (!(targetProp.flags & 4194304)) {
+                    if (!(targetProp.flags & 4194304 /* Prototype */)) {
                         var sourceProp = getPropertyOfType(source, targetProp.escapedName);
                         if (sourceProp && sourceProp !== targetProp) {
                             if (isIgnoredJsxProperty(source, sourceProp, getTypeOfSymbol(targetProp))) {
@@ -30501,74 +39343,86 @@ var ts;
                             }
                             var sourcePropFlags = ts.getDeclarationModifierFlagsFromSymbol(sourceProp);
                             var targetPropFlags = ts.getDeclarationModifierFlagsFromSymbol(targetProp);
-                            if (sourcePropFlags & 8 || targetPropFlags & 8) {
+                            if (sourcePropFlags & 8 /* Private */ || targetPropFlags & 8 /* Private */) {
                                 var hasDifferingDeclarations = sourceProp.valueDeclaration !== targetProp.valueDeclaration;
-                                if (ts.getCheckFlags(sourceProp) & 256 && hasDifferingDeclarations) {
+                                if (ts.getCheckFlags(sourceProp) & 256 /* ContainsPrivate */ && hasDifferingDeclarations) {
                                     if (reportErrors) {
                                         reportError(ts.Diagnostics.Property_0_has_conflicting_declarations_and_is_inaccessible_in_type_1, symbolToString(sourceProp), typeToString(source));
                                     }
-                                    return 0;
+                                    return 0 /* False */;
                                 }
                                 if (hasDifferingDeclarations) {
                                     if (reportErrors) {
-                                        if (sourcePropFlags & 8 && targetPropFlags & 8) {
+                                        if (sourcePropFlags & 8 /* Private */ && targetPropFlags & 8 /* Private */) {
                                             reportError(ts.Diagnostics.Types_have_separate_declarations_of_a_private_property_0, symbolToString(targetProp));
                                         }
                                         else {
-                                            reportError(ts.Diagnostics.Property_0_is_private_in_type_1_but_not_in_type_2, symbolToString(targetProp), typeToString(sourcePropFlags & 8 ? source : target), typeToString(sourcePropFlags & 8 ? target : source));
+                                            reportError(ts.Diagnostics.Property_0_is_private_in_type_1_but_not_in_type_2, symbolToString(targetProp), typeToString(sourcePropFlags & 8 /* Private */ ? source : target), typeToString(sourcePropFlags & 8 /* Private */ ? target : source));
                                         }
                                     }
-                                    return 0;
+                                    return 0 /* False */;
                                 }
                             }
-                            else if (targetPropFlags & 16) {
+                            else if (targetPropFlags & 16 /* Protected */) {
                                 if (!isValidOverrideOf(sourceProp, targetProp)) {
                                     if (reportErrors) {
                                         reportError(ts.Diagnostics.Property_0_is_protected_but_type_1_is_not_a_class_derived_from_2, symbolToString(targetProp), typeToString(getDeclaringClass(sourceProp) || source), typeToString(getDeclaringClass(targetProp) || target));
                                     }
-                                    return 0;
+                                    return 0 /* False */;
                                 }
                             }
-                            else if (sourcePropFlags & 16) {
+                            else if (sourcePropFlags & 16 /* Protected */) {
                                 if (reportErrors) {
                                     reportError(ts.Diagnostics.Property_0_is_protected_in_type_1_but_public_in_type_2, symbolToString(targetProp), typeToString(source), typeToString(target));
                                 }
-                                return 0;
+                                return 0 /* False */;
                             }
                             var related = isRelatedTo(getTypeOfSymbol(sourceProp), getTypeOfSymbol(targetProp), reportErrors);
                             if (!related) {
                                 if (reportErrors) {
                                     reportError(ts.Diagnostics.Types_of_property_0_are_incompatible, symbolToString(targetProp));
                                 }
-                                return 0;
+                                return 0 /* False */;
                             }
                             result &= related;
-                            if (relation !== comparableRelation && sourceProp.flags & 16777216 && !(targetProp.flags & 16777216)) {
+                            // When checking for comparability, be more lenient with optional properties.
+                            if (relation !== comparableRelation && sourceProp.flags & 16777216 /* Optional */ && !(targetProp.flags & 16777216 /* Optional */)) {
+                                // TypeScript 1.0 spec (April 2014): 3.8.3
+                                // S is a subtype of a type T, and T is a supertype of S if ...
+                                // S' and T are object types and, for each member M in T..
+                                // M is a property and S' contains a property N where
+                                // if M is a required property, N is also a required property
+                                // (M - property in T)
+                                // (N - property in S)
                                 if (reportErrors) {
                                     reportError(ts.Diagnostics.Property_0_is_optional_in_type_1_but_required_in_type_2, symbolToString(targetProp), typeToString(source), typeToString(target));
                                 }
-                                return 0;
+                                return 0 /* False */;
                             }
                         }
                     }
                 }
                 return result;
             }
+            /**
+             * A type is 'weak' if it is an object type with at least one optional property
+             * and no required properties, call/construct signatures or index signatures
+             */
             function isWeakType(type) {
-                if (type.flags & 131072) {
+                if (type.flags & 131072 /* Object */) {
                     var resolved = resolveStructuredTypeMembers(type);
                     return resolved.callSignatures.length === 0 && resolved.constructSignatures.length === 0 &&
                         !resolved.stringIndexInfo && !resolved.numberIndexInfo &&
                         resolved.properties.length > 0 &&
-                        ts.every(resolved.properties, function (p) { return !!(p.flags & 16777216); });
+                        ts.every(resolved.properties, function (p) { return !!(p.flags & 16777216 /* Optional */); });
                 }
-                if (type.flags & 524288) {
+                if (type.flags & 524288 /* Intersection */) {
                     return ts.every(type.types, isWeakType);
                 }
                 return false;
             }
             function hasCommonProperties(source, target) {
-                var isComparingJsxAttributes = !!(ts.getObjectFlags(source) & 4096);
+                var isComparingJsxAttributes = !!(ts.getObjectFlags(source) & 4096 /* JsxAttributes */);
                 for (var _i = 0, _a = getPropertiesOfType(source); _i < _a.length; _i++) {
                     var prop = _a[_i];
                     if (isKnownProperty(target, prop.escapedName, isComparingJsxAttributes)) {
@@ -30578,24 +39432,24 @@ var ts;
                 return false;
             }
             function propertiesIdenticalTo(source, target) {
-                if (!(source.flags & 131072 && target.flags & 131072)) {
-                    return 0;
+                if (!(source.flags & 131072 /* Object */ && target.flags & 131072 /* Object */)) {
+                    return 0 /* False */;
                 }
                 var sourceProperties = getPropertiesOfObjectType(source);
                 var targetProperties = getPropertiesOfObjectType(target);
                 if (sourceProperties.length !== targetProperties.length) {
-                    return 0;
+                    return 0 /* False */;
                 }
-                var result = -1;
+                var result = -1 /* True */;
                 for (var _i = 0, sourceProperties_1 = sourceProperties; _i < sourceProperties_1.length; _i++) {
                     var sourceProp = sourceProperties_1[_i];
                     var targetProp = getPropertyOfObjectType(target, sourceProp.escapedName);
                     if (!targetProp) {
-                        return 0;
+                        return 0 /* False */;
                     }
                     var related = compareProperties(sourceProp, targetProp, isRelatedTo);
                     if (!related) {
-                        return 0;
+                        return 0 /* False */;
                     }
                     result &= related;
                 }
@@ -30606,43 +39460,57 @@ var ts;
                     return signaturesIdenticalTo(source, target, kind);
                 }
                 if (target === anyFunctionType || source === anyFunctionType) {
-                    return -1;
+                    return -1 /* True */;
                 }
                 var sourceSignatures = getSignaturesOfType(source, kind);
                 var targetSignatures = getSignaturesOfType(target, kind);
-                if (kind === 1 && sourceSignatures.length && targetSignatures.length) {
+                if (kind === 1 /* Construct */ && sourceSignatures.length && targetSignatures.length) {
                     if (ts.isAbstractConstructorType(source) && !ts.isAbstractConstructorType(target)) {
+                        // An abstract constructor type is not assignable to a non-abstract constructor type
+                        // as it would otherwise be possible to new an abstract class. Note that the assignability
+                        // check we perform for an extends clause excludes construct signatures from the target,
+                        // so this check never proceeds.
                         if (reportErrors) {
                             reportError(ts.Diagnostics.Cannot_assign_an_abstract_constructor_type_to_a_non_abstract_constructor_type);
                         }
-                        return 0;
+                        return 0 /* False */;
                     }
                     if (!constructorVisibilitiesAreCompatible(sourceSignatures[0], targetSignatures[0], reportErrors)) {
-                        return 0;
+                        return 0 /* False */;
                     }
                 }
-                var result = -1;
+                var result = -1 /* True */;
                 var saveErrorInfo = errorInfo;
-                if (ts.getObjectFlags(source) & 64 && ts.getObjectFlags(target) & 64 && source.symbol === target.symbol) {
+                if (ts.getObjectFlags(source) & 64 /* Instantiated */ && ts.getObjectFlags(target) & 64 /* Instantiated */ && source.symbol === target.symbol) {
+                    // We have instantiations of the same anonymous type (which typically will be the type of a
+                    // method). Simply do a pairwise comparison of the signatures in the two signature lists instead
+                    // of the much more expensive N * M comparison matrix we explore below. We erase type parameters
+                    // as they are known to always be the same.
                     for (var i = 0; i < targetSignatures.length; i++) {
-                        var related = signatureRelatedTo(sourceSignatures[i], targetSignatures[i], true, reportErrors);
+                        var related = signatureRelatedTo(sourceSignatures[i], targetSignatures[i], /*erase*/ true, reportErrors);
                         if (!related) {
-                            return 0;
+                            return 0 /* False */;
                         }
                         result &= related;
                     }
                 }
                 else if (sourceSignatures.length === 1 && targetSignatures.length === 1) {
+                    // For simple functions (functions with a single signature) we only erase type parameters for
+                    // the comparable relation. Otherwise, if the source signature is generic, we instantiate it
+                    // in the context of the target signature before checking the relationship. Ideally we'd do
+                    // this regardless of the number of signatures, but the potential costs are prohibitive due
+                    // to the quadratic nature of the logic below.
                     var eraseGenerics = relation === comparableRelation || !!compilerOptions.noStrictGenericChecks;
                     result = signatureRelatedTo(sourceSignatures[0], targetSignatures[0], eraseGenerics, reportErrors);
                 }
                 else {
                     outer: for (var _i = 0, targetSignatures_1 = targetSignatures; _i < targetSignatures_1.length; _i++) {
                         var t = targetSignatures_1[_i];
+                        // Only elaborate errors from the first failure
                         var shouldElaborateErrors = reportErrors;
                         for (var _a = 0, sourceSignatures_1 = sourceSignatures; _a < sourceSignatures_1.length; _a++) {
                             var s = sourceSignatures_1[_a];
-                            var related = signatureRelatedTo(s, t, true, shouldElaborateErrors);
+                            var related = signatureRelatedTo(s, t, /*erase*/ true, shouldElaborateErrors);
                             if (related) {
                                 result &= related;
                                 errorInfo = saveErrorInfo;
@@ -30651,49 +39519,53 @@ var ts;
                             shouldElaborateErrors = false;
                         }
                         if (shouldElaborateErrors) {
-                            reportError(ts.Diagnostics.Type_0_provides_no_match_for_the_signature_1, typeToString(source), signatureToString(t, undefined, undefined, kind));
+                            reportError(ts.Diagnostics.Type_0_provides_no_match_for_the_signature_1, typeToString(source), signatureToString(t, /*enclosingDeclaration*/ undefined, /*flags*/ undefined, kind));
                         }
-                        return 0;
+                        return 0 /* False */;
                     }
                 }
                 return result;
             }
+            /**
+             * See signatureAssignableTo, compareSignaturesIdentical
+             */
             function signatureRelatedTo(source, target, erase, reportErrors) {
-                return compareSignaturesRelated(erase ? getErasedSignature(source) : source, erase ? getErasedSignature(target) : target, 0, false, reportErrors, reportError, isRelatedTo);
+                return compareSignaturesRelated(erase ? getErasedSignature(source) : source, erase ? getErasedSignature(target) : target, 0 /* None */, /*ignoreReturnTypes*/ false, reportErrors, reportError, isRelatedTo);
             }
             function signaturesIdenticalTo(source, target, kind) {
                 var sourceSignatures = getSignaturesOfType(source, kind);
                 var targetSignatures = getSignaturesOfType(target, kind);
                 if (sourceSignatures.length !== targetSignatures.length) {
-                    return 0;
+                    return 0 /* False */;
                 }
-                var result = -1;
+                var result = -1 /* True */;
                 for (var i = 0; i < sourceSignatures.length; i++) {
-                    var related = compareSignaturesIdentical(sourceSignatures[i], targetSignatures[i], false, false, false, isRelatedTo);
+                    var related = compareSignaturesIdentical(sourceSignatures[i], targetSignatures[i], /*partialMatch*/ false, /*ignoreThisTypes*/ false, /*ignoreReturnTypes*/ false, isRelatedTo);
                     if (!related) {
-                        return 0;
+                        return 0 /* False */;
                     }
                     result &= related;
                 }
                 return result;
             }
             function eachPropertyRelatedTo(source, target, kind, reportErrors) {
-                var result = -1;
+                var result = -1 /* True */;
                 for (var _i = 0, _a = getPropertiesOfObjectType(source); _i < _a.length; _i++) {
                     var prop = _a[_i];
-                    if (isIgnoredJsxProperty(source, prop, undefined)) {
+                    if (isIgnoredJsxProperty(source, prop, /*targetMemberType*/ undefined)) {
                         continue;
                     }
-                    if (prop.nameType && prop.nameType.flags & 2048) {
+                    // Skip over symbol-named members
+                    if (prop.nameType && prop.nameType.flags & 2048 /* UniqueESSymbol */) {
                         continue;
                     }
-                    if (kind === 0 || isNumericLiteralName(prop.escapedName)) {
+                    if (kind === 0 /* String */ || isNumericLiteralName(prop.escapedName)) {
                         var related = isRelatedTo(getTypeOfSymbol(prop), target, reportErrors);
                         if (!related) {
                             if (reportErrors) {
                                 reportError(ts.Diagnostics.Property_0_is_incompatible_with_index_signature, symbolToString(prop));
                             }
-                            return 0;
+                            return 0 /* False */;
                         }
                         result &= related;
                     }
@@ -30712,21 +39584,24 @@ var ts;
                     return indexTypesIdenticalTo(source, target, kind);
                 }
                 var targetInfo = getIndexInfoOfType(target, kind);
-                if (!targetInfo || targetInfo.type.flags & 3 && !sourceIsPrimitive) {
-                    return -1;
+                if (!targetInfo || targetInfo.type.flags & 3 /* AnyOrUnknown */ && !sourceIsPrimitive) {
+                    // Index signature of type any permits assignment from everything but primitives
+                    return -1 /* True */;
                 }
                 var sourceInfo = getIndexInfoOfType(source, kind) ||
-                    kind === 1 && getIndexInfoOfType(source, 0);
+                    kind === 1 /* Number */ && getIndexInfoOfType(source, 0 /* String */);
                 if (sourceInfo) {
                     return indexInfoRelatedTo(sourceInfo, targetInfo, reportErrors);
                 }
                 if (isGenericMappedType(source)) {
-                    return (kind === 0 && isRelatedTo(getTemplateTypeFromMappedType(source), targetInfo.type, reportErrors));
+                    // A generic mapped type { [P in K]: T } is related to an index signature { [x: string]: U }
+                    // if T is related to U.
+                    return (kind === 0 /* String */ && isRelatedTo(getTemplateTypeFromMappedType(source), targetInfo.type, reportErrors)); // TODO: GH#18217
                 }
                 if (isObjectTypeWithInferableIndex(source)) {
-                    var related = -1;
-                    if (kind === 0) {
-                        var sourceNumberInfo = getIndexInfoOfType(source, 1);
+                    var related = -1 /* True */;
+                    if (kind === 0 /* String */) {
+                        var sourceNumberInfo = getIndexInfoOfType(source, 1 /* Number */);
                         if (sourceNumberInfo) {
                             related = indexInfoRelatedTo(sourceNumberInfo, targetInfo, reportErrors);
                         }
@@ -30739,32 +39614,35 @@ var ts;
                 if (reportErrors) {
                     reportError(ts.Diagnostics.Index_signature_is_missing_in_type_0, typeToString(source));
                 }
-                return 0;
+                return 0 /* False */;
             }
             function indexTypesIdenticalTo(source, target, indexKind) {
                 var targetInfo = getIndexInfoOfType(target, indexKind);
                 var sourceInfo = getIndexInfoOfType(source, indexKind);
                 if (!sourceInfo && !targetInfo) {
-                    return -1;
+                    return -1 /* True */;
                 }
                 if (sourceInfo && targetInfo && sourceInfo.isReadonly === targetInfo.isReadonly) {
                     return isRelatedTo(sourceInfo.type, targetInfo.type);
                 }
-                return 0;
+                return 0 /* False */;
             }
             function constructorVisibilitiesAreCompatible(sourceSignature, targetSignature, reportErrors) {
                 if (!sourceSignature.declaration || !targetSignature.declaration) {
                     return true;
                 }
-                var sourceAccessibility = ts.getSelectedModifierFlags(sourceSignature.declaration, 24);
-                var targetAccessibility = ts.getSelectedModifierFlags(targetSignature.declaration, 24);
-                if (targetAccessibility === 8) {
+                var sourceAccessibility = ts.getSelectedModifierFlags(sourceSignature.declaration, 24 /* NonPublicAccessibilityModifier */);
+                var targetAccessibility = ts.getSelectedModifierFlags(targetSignature.declaration, 24 /* NonPublicAccessibilityModifier */);
+                // A public, protected and private signature is assignable to a private signature.
+                if (targetAccessibility === 8 /* Private */) {
                     return true;
                 }
-                if (targetAccessibility === 16 && sourceAccessibility !== 8) {
+                // A public and protected signature is assignable to a protected signature.
+                if (targetAccessibility === 16 /* Protected */ && sourceAccessibility !== 8 /* Private */) {
                     return true;
                 }
-                if (targetAccessibility !== 16 && !sourceAccessibility) {
+                // Only a public signature is assignable to public signature.
+                if (targetAccessibility !== 16 /* Protected */ && !sourceAccessibility) {
                     return true;
                 }
                 if (reportErrors) {
@@ -30773,11 +39651,19 @@ var ts;
                 return false;
             }
         }
+        // Return a type reference where the source type parameter is replaced with the target marker
+        // type, and flag the result as a marker type reference.
         function getMarkerTypeReference(type, source, target) {
             var result = createTypeReference(type, ts.map(type.typeParameters, function (t) { return t === source ? target : t; }));
-            result.objectFlags |= 8192;
+            result.objectFlags |= 8192 /* MarkerType */;
             return result;
         }
+        // Return an array containing the variance of each type parameter. The variance is effectively
+        // a digest of the type comparisons that occur for each type argument when instantiations of the
+        // generic type are structurally compared. We infer the variance information by comparing
+        // instantiations of the generic type for type arguments with known relations. The function
+        // returns the emptyArray singleton if we're not in strictFunctionTypes mode or if the function
+        // has been invoked recursively for the given generic type.
         function getVariances(type) {
             if (!strictFunctionTypes) {
                 return ts.emptyArray;
@@ -30786,19 +39672,28 @@ var ts;
             var variances = type.variances;
             if (!variances) {
                 if (type === globalArrayType || type === globalReadonlyArrayType) {
-                    variances = [1];
+                    // Arrays are known to be covariant, no need to spend time computing this
+                    variances = [1 /* Covariant */];
                 }
                 else {
+                    // The emptyArray singleton is used to signal a recursive invocation.
                     type.variances = ts.emptyArray;
                     variances = [];
                     for (var _i = 0, typeParameters_1 = typeParameters; _i < typeParameters_1.length; _i++) {
                         var tp = typeParameters_1[_i];
+                        // We first compare instantiations where the type parameter is replaced with
+                        // marker types that have a known subtype relationship. From this we can infer
+                        // invariance, covariance, contravariance or bivariance.
                         var typeWithSuper = getMarkerTypeReference(type, tp, markerSuperType);
                         var typeWithSub = getMarkerTypeReference(type, tp, markerSubType);
-                        var variance = (isTypeAssignableTo(typeWithSub, typeWithSuper) ? 1 : 0) |
-                            (isTypeAssignableTo(typeWithSuper, typeWithSub) ? 2 : 0);
-                        if (variance === 3 && isTypeAssignableTo(getMarkerTypeReference(type, tp, markerOtherType), typeWithSuper)) {
-                            variance = 4;
+                        var variance = (isTypeAssignableTo(typeWithSub, typeWithSuper) ? 1 /* Covariant */ : 0) |
+                            (isTypeAssignableTo(typeWithSuper, typeWithSub) ? 2 /* Contravariant */ : 0);
+                        // If the instantiations appear to be related bivariantly it may be because the
+                        // type parameter is independent (i.e. it isn't witnessed anywhere in the generic
+                        // type). To determine this we compare instantiations where the type parameter is
+                        // replaced with marker types that are known to be unrelated.
+                        if (variance === 3 /* Bivariant */ && isTypeAssignableTo(getMarkerTypeReference(type, tp, markerOtherType), typeWithSuper)) {
+                            variance = 4 /* Independent */;
                         }
                         variances.push(variance);
                     }
@@ -30807,20 +39702,26 @@ var ts;
             }
             return variances;
         }
+        // Return true if the given type reference has a 'void' type argument for a covariant type parameter.
+        // See comment at call in recursiveTypeRelatedTo for when this case matters.
         function hasCovariantVoidArgument(type, variances) {
             for (var i = 0; i < variances.length; i++) {
-                if (variances[i] === 1 && type.typeArguments[i].flags & 4096) {
+                if (variances[i] === 1 /* Covariant */ && type.typeArguments[i].flags & 4096 /* Void */) {
                     return true;
                 }
             }
             return false;
         }
         function isUnconstrainedTypeParameter(type) {
-            return type.flags & 65536 && !getConstraintFromTypeParameter(type);
+            return type.flags & 65536 /* TypeParameter */ && !getConstraintFromTypeParameter(type);
         }
         function isTypeReferenceWithGenericArguments(type) {
-            return !!(ts.getObjectFlags(type) & 4) && ts.some(type.typeArguments, function (t) { return isUnconstrainedTypeParameter(t) || isTypeReferenceWithGenericArguments(t); });
+            return !!(ts.getObjectFlags(type) & 4 /* Reference */) && ts.some(type.typeArguments, function (t) { return isUnconstrainedTypeParameter(t) || isTypeReferenceWithGenericArguments(t); });
         }
+        /**
+         * getTypeReferenceId(A<T, number, U>) returns "111=0-12=1"
+         *   where A.id=111 and number.id=12
+         */
         function getTypeReferenceId(type, typeParameters, depth) {
             if (depth === void 0) { depth = 0; }
             var result = "" + type.target.id;
@@ -30843,6 +39744,10 @@ var ts;
             }
             return result;
         }
+        /**
+         * To improve caching, the relation key for two generic types uses the target's id plus ids of the type parameters.
+         * For other cases, the types ids are used.
+         */
         function getRelationKey(source, target, relation) {
             if (relation === identityRelation && source.id > target.id) {
                 var temp = source;
@@ -30855,8 +39760,10 @@ var ts;
             }
             return source.id + "," + target.id;
         }
+        // Invoke the callback for each underlying property symbol of the given symbol and return the first
+        // value that isn't undefined.
         function forEachProperty(prop, callback) {
-            if (ts.getCheckFlags(prop) & 6) {
+            if (ts.getCheckFlags(prop) & 6 /* Synthetic */) {
                 for (var _i = 0, _a = prop.containingType.types; _i < _a.length; _i++) {
                     var t = _a[_i];
                     var p = getPropertyOfType(t, prop.escapedName);
@@ -30869,31 +39776,43 @@ var ts;
             }
             return callback(prop);
         }
+        // Return the declaring class type of a property or undefined if property not declared in class
         function getDeclaringClass(prop) {
-            return prop.parent && prop.parent.flags & 32 ? getDeclaredTypeOfSymbol(getParentOfSymbol(prop)) : undefined;
+            return prop.parent && prop.parent.flags & 32 /* Class */ ? getDeclaredTypeOfSymbol(getParentOfSymbol(prop)) : undefined;
         }
+        // Return true if some underlying source property is declared in a class that derives
+        // from the given base class.
         function isPropertyInClassDerivedFrom(prop, baseClass) {
             return forEachProperty(prop, function (sp) {
                 var sourceClass = getDeclaringClass(sp);
                 return sourceClass ? hasBaseType(sourceClass, baseClass) : false;
             });
         }
+        // Return true if source property is a valid override of protected parts of target property.
         function isValidOverrideOf(sourceProp, targetProp) {
-            return !forEachProperty(targetProp, function (tp) { return ts.getDeclarationModifierFlagsFromSymbol(tp) & 16 ?
+            return !forEachProperty(targetProp, function (tp) { return ts.getDeclarationModifierFlagsFromSymbol(tp) & 16 /* Protected */ ?
                 !isPropertyInClassDerivedFrom(sourceProp, getDeclaringClass(tp)) : false; });
         }
+        // Return true if the given class derives from each of the declaring classes of the protected
+        // constituents of the given property.
         function isClassDerivedFromDeclaringClasses(checkClass, prop) {
-            return forEachProperty(prop, function (p) { return ts.getDeclarationModifierFlagsFromSymbol(p) & 16 ?
+            return forEachProperty(prop, function (p) { return ts.getDeclarationModifierFlagsFromSymbol(p) & 16 /* Protected */ ?
                 !hasBaseType(checkClass, getDeclaringClass(p)) : false; }) ? undefined : checkClass;
         }
+        // Return true if the given type is deeply nested. We consider this to be the case when structural type comparisons
+        // for 5 or more occurrences or instantiations of the type have been recorded on the given stack. It is possible,
+        // though highly unlikely, for this test to be true in a situation where a chain of instantiations is not infinitely
+        // expanding. Effectively, we will generate a false positive when two types are structurally equal to at least 5
+        // levels, but unequal at some level beyond that.
         function isDeeplyNestedType(type, stack, depth) {
-            if (depth >= 5 && type.flags & 131072) {
+            // We track all object types that have an associated symbol (representing the origin of the type)
+            if (depth >= 5 && type.flags & 131072 /* Object */) {
                 var symbol = type.symbol;
                 if (symbol) {
                     var count = 0;
                     for (var i = 0; i < depth; i++) {
                         var t = stack[i];
-                        if (t.flags & 131072 && t.symbol === symbol) {
+                        if (t.flags & 131072 /* Object */ && t.symbol === symbol) {
                             count++;
                             if (count >= 5)
                                 return true;
@@ -30904,38 +39823,46 @@ var ts;
             return false;
         }
         function isPropertyIdenticalTo(sourceProp, targetProp) {
-            return compareProperties(sourceProp, targetProp, compareTypesIdentical) !== 0;
+            return compareProperties(sourceProp, targetProp, compareTypesIdentical) !== 0 /* False */;
         }
         function compareProperties(sourceProp, targetProp, compareTypes) {
+            // Two members are considered identical when
+            // - they are public properties with identical names, optionality, and types,
+            // - they are private or protected properties originating in the same declaration and having identical types
             if (sourceProp === targetProp) {
-                return -1;
+                return -1 /* True */;
             }
-            var sourcePropAccessibility = ts.getDeclarationModifierFlagsFromSymbol(sourceProp) & 24;
-            var targetPropAccessibility = ts.getDeclarationModifierFlagsFromSymbol(targetProp) & 24;
+            var sourcePropAccessibility = ts.getDeclarationModifierFlagsFromSymbol(sourceProp) & 24 /* NonPublicAccessibilityModifier */;
+            var targetPropAccessibility = ts.getDeclarationModifierFlagsFromSymbol(targetProp) & 24 /* NonPublicAccessibilityModifier */;
             if (sourcePropAccessibility !== targetPropAccessibility) {
-                return 0;
+                return 0 /* False */;
             }
             if (sourcePropAccessibility) {
                 if (getTargetSymbol(sourceProp) !== getTargetSymbol(targetProp)) {
-                    return 0;
+                    return 0 /* False */;
                 }
             }
             else {
-                if ((sourceProp.flags & 16777216) !== (targetProp.flags & 16777216)) {
-                    return 0;
+                if ((sourceProp.flags & 16777216 /* Optional */) !== (targetProp.flags & 16777216 /* Optional */)) {
+                    return 0 /* False */;
                 }
             }
             if (isReadonlySymbol(sourceProp) !== isReadonlySymbol(targetProp)) {
-                return 0;
+                return 0 /* False */;
             }
             return compareTypes(getTypeOfSymbol(sourceProp), getTypeOfSymbol(targetProp));
         }
         function isMatchingSignature(source, target, partialMatch) {
+            // A source signature matches a target signature if the two signatures have the same number of required,
+            // optional, and rest parameters.
             if (source.parameters.length === target.parameters.length &&
                 source.minArgumentCount === target.minArgumentCount &&
                 source.hasRestParameter === target.hasRestParameter) {
                 return true;
             }
+            // A source signature partially matches a target signature if the target signature has no fewer required
+            // parameters and no more overall parameters than the source signature (where a signature with a rest
+            // parameter is always considered to have more overall parameters than one without).
             var sourceRestCount = source.hasRestParameter ? 1 : 0;
             var targetRestCount = target.hasRestParameter ? 1 : 0;
             if (partialMatch && source.minArgumentCount <= target.minArgumentCount && (sourceRestCount > targetRestCount ||
@@ -30944,19 +39871,30 @@ var ts;
             }
             return false;
         }
+        /**
+         * See signatureRelatedTo, compareSignaturesIdentical
+         */
         function compareSignaturesIdentical(source, target, partialMatch, ignoreThisTypes, ignoreReturnTypes, compareTypes) {
+            // TODO (drosen): De-duplicate code between related functions.
             if (source === target) {
-                return -1;
+                return -1 /* True */;
             }
             if (!(isMatchingSignature(source, target, partialMatch))) {
-                return 0;
+                return 0 /* False */;
             }
+            // Check that the two signatures have the same number of type parameters. We might consider
+            // also checking that any type parameter constraints match, but that would require instantiating
+            // the constraints with a common set of type arguments to get relatable entities in places where
+            // type parameters occur in the constraints. The complexity of doing that doesn't seem worthwhile,
+            // particularly as we're comparing erased versions of the signatures below.
             if (ts.length(source.typeParameters) !== ts.length(target.typeParameters)) {
-                return 0;
+                return 0 /* False */;
             }
+            // Spec 1.0 Section 3.8.3 & 3.8.4:
+            // M and N (the signatures) are instantiated using type Any as the type argument for all type parameters declared by M and N
             source = getErasedSignature(source);
             target = getErasedSignature(target);
-            var result = -1;
+            var result = -1 /* True */;
             if (!ignoreThisTypes) {
                 var sourceThisType = getThisTypeOfSignature(source);
                 if (sourceThisType) {
@@ -30964,7 +39902,7 @@ var ts;
                     if (targetThisType) {
                         var related = compareTypes(sourceThisType, targetThisType);
                         if (!related) {
-                            return 0;
+                            return 0 /* False */;
                         }
                         result &= related;
                     }
@@ -30976,7 +39914,7 @@ var ts;
                 var t = isRestParameterIndex(target, i) ? getRestTypeOfSignature(target) : getTypeOfParameter(target.parameters[i]);
                 var related = compareTypes(s, t);
                 if (!related) {
-                    return 0;
+                    return 0 /* False */;
                 }
                 result &= related;
             }
@@ -30985,12 +39923,13 @@ var ts;
                 var targetTypePredicate = getTypePredicateOfSignature(target);
                 result &= sourceTypePredicate !== undefined || targetTypePredicate !== undefined
                     ? compareTypePredicatesIdentical(sourceTypePredicate, targetTypePredicate, compareTypes)
+                    // If they're both type predicates their return types will both be `boolean`, so no need to compare those.
                     : compareTypes(getReturnTypeOfSignature(source), getReturnTypeOfSignature(target));
             }
             return result;
         }
         function compareTypePredicatesIdentical(source, target, compareTypes) {
-            return source === undefined || target === undefined || !typePredicateKindsMatch(source, target) ? 0 : compareTypes(source.type, target.type);
+            return source === undefined || target === undefined || !typePredicateKindsMatch(source, target) ? 0 /* False */ : compareTypes(source.type, target.type);
         }
         function isRestParameterIndex(signature, parameterIndex) {
             return signature.hasRestParameter && parameterIndex >= signature.parameters.length - 1;
@@ -31009,6 +39948,9 @@ var ts;
             }
             return true;
         }
+        // When the candidate types are all literal types with the same base type, return a union
+        // of those literal types. Otherwise, return the leftmost type for which no type to the
+        // right is a supertype.
         function getSupertypeOrUnion(types) {
             return literalTypesWithSameBaseType(types) ?
                 getUnionType(types) :
@@ -31018,20 +39960,23 @@ var ts;
             if (!strictNullChecks) {
                 return getSupertypeOrUnion(types);
             }
-            var primaryTypes = ts.filter(types, function (t) { return !(t.flags & 24576); });
+            var primaryTypes = ts.filter(types, function (t) { return !(t.flags & 24576 /* Nullable */); });
             return primaryTypes.length ?
-                getNullableType(getSupertypeOrUnion(primaryTypes), getFalsyFlagsOfTypes(types) & 24576) :
-                getUnionType(types, 2);
+                getNullableType(getSupertypeOrUnion(primaryTypes), getFalsyFlagsOfTypes(types) & 24576 /* Nullable */) :
+                getUnionType(types, 2 /* Subtype */);
         }
+        // Return the leftmost type for which no type to the right is a subtype.
         function getCommonSubtype(types) {
             return ts.reduceLeft(types, function (s, t) { return isTypeSubtypeOf(t, s) ? t : s; });
         }
         function isArrayType(type) {
-            return !!(ts.getObjectFlags(type) & 4) && type.target === globalArrayType;
+            return !!(ts.getObjectFlags(type) & 4 /* Reference */) && type.target === globalArrayType;
         }
         function isArrayLikeType(type) {
-            return ts.getObjectFlags(type) & 4 && (type.target === globalArrayType || type.target === globalReadonlyArrayType) ||
-                !(type.flags & 24576) && isTypeAssignableTo(type, anyReadonlyArrayType);
+            // A type is array-like if it is a reference to the global Array or global ReadonlyArray type,
+            // or if it is not the undefined or null type and if it is assignable to ReadonlyArray<any>
+            return ts.getObjectFlags(type) & 4 /* Reference */ && (type.target === globalArrayType || type.target === globalReadonlyArrayType) ||
+                !(type.flags & 24576 /* Nullable */) && isTypeAssignableTo(type, anyReadonlyArrayType);
         }
         function isEmptyArrayLiteralType(type) {
             var elementType = isArrayType(type) ? type.typeArguments[0] : undefined;
@@ -31041,35 +39986,35 @@ var ts;
             return !!getPropertyOfType(type, "0");
         }
         function isNeitherUnitTypeNorNever(type) {
-            return !(type.flags & (27072 | 32768));
+            return !(type.flags & (27072 /* Unit */ | 32768 /* Never */));
         }
         function isUnitType(type) {
-            return !!(type.flags & 27072);
+            return !!(type.flags & 27072 /* Unit */);
         }
         function isLiteralType(type) {
-            return type.flags & 16 ? true :
-                type.flags & 262144 ? type.flags & 512 ? true : !ts.forEach(type.types, function (t) { return !isUnitType(t); }) :
+            return type.flags & 16 /* Boolean */ ? true :
+                type.flags & 262144 /* Union */ ? type.flags & 512 /* EnumLiteral */ ? true : ts.every(type.types, isUnitType) :
                     isUnitType(type);
         }
         function getBaseTypeOfLiteralType(type) {
-            return type.flags & 512 ? getBaseTypeOfEnumLiteralType(type) :
-                type.flags & 64 ? stringType :
-                    type.flags & 128 ? numberType :
-                        type.flags & 256 ? booleanType :
-                            type.flags & 262144 ? getUnionType(ts.sameMap(type.types, getBaseTypeOfLiteralType)) :
+            return type.flags & 512 /* EnumLiteral */ ? getBaseTypeOfEnumLiteralType(type) :
+                type.flags & 64 /* StringLiteral */ ? stringType :
+                    type.flags & 128 /* NumberLiteral */ ? numberType :
+                        type.flags & 256 /* BooleanLiteral */ ? booleanType :
+                            type.flags & 262144 /* Union */ ? getUnionType(ts.sameMap(type.types, getBaseTypeOfLiteralType)) :
                                 type;
         }
         function getWidenedLiteralType(type) {
-            return type.flags & 512 ? getBaseTypeOfEnumLiteralType(type) :
-                type.flags & 64 && type.flags & 33554432 ? stringType :
-                    type.flags & 128 && type.flags & 33554432 ? numberType :
-                        type.flags & 256 ? booleanType :
-                            type.flags & 262144 ? getUnionType(ts.sameMap(type.types, getWidenedLiteralType)) :
+            return type.flags & 512 /* EnumLiteral */ ? getBaseTypeOfEnumLiteralType(type) :
+                type.flags & 64 /* StringLiteral */ && type.flags & 33554432 /* FreshLiteral */ ? stringType :
+                    type.flags & 128 /* NumberLiteral */ && type.flags & 33554432 /* FreshLiteral */ ? numberType :
+                        type.flags & 256 /* BooleanLiteral */ ? booleanType :
+                            type.flags & 262144 /* Union */ ? getUnionType(ts.sameMap(type.types, getWidenedLiteralType)) :
                                 type;
         }
         function getWidenedUniqueESSymbolType(type) {
-            return type.flags & 2048 ? esSymbolType :
-                type.flags & 262144 ? getUnionType(ts.sameMap(type.types, getWidenedUniqueESSymbolType)) :
+            return type.flags & 2048 /* UniqueESSymbol */ ? esSymbolType :
+                type.flags & 262144 /* Union */ ? getUnionType(ts.sameMap(type.types, getWidenedUniqueESSymbolType)) :
                     type;
         }
         function getWidenedLiteralLikeTypeForContextualType(type, contextualType) {
@@ -31078,8 +40023,12 @@ var ts;
             }
             return type;
         }
+        /**
+         * Check if a Type was written as a tuple type literal.
+         * Prefer using isTupleLikeType() unless the use of `elementTypes` is required.
+         */
         function isTupleType(type) {
-            return !!(ts.getObjectFlags(type) & 4 && type.target.objectFlags & 8);
+            return !!(ts.getObjectFlags(type) & 4 /* Reference */ && type.target.objectFlags & 8 /* Tuple */);
         }
         function getFalsyFlagsOfTypes(types) {
             var result = 0;
@@ -31089,55 +40038,68 @@ var ts;
             }
             return result;
         }
+        // Returns the String, Number, Boolean, StringLiteral, NumberLiteral, BooleanLiteral, Void, Undefined, or Null
+        // flags for the string, number, boolean, "", 0, false, void, undefined, or null types respectively. Returns
+        // no flags for all other types (including non-falsy literal types).
         function getFalsyFlags(type) {
-            return type.flags & 262144 ? getFalsyFlagsOfTypes(type.types) :
-                type.flags & 64 ? type.value === "" ? 64 : 0 :
-                    type.flags & 128 ? type.value === 0 ? 128 : 0 :
-                        type.flags & 256 ? type === falseType ? 256 : 0 :
-                            type.flags & 29148;
+            return type.flags & 262144 /* Union */ ? getFalsyFlagsOfTypes(type.types) :
+                type.flags & 64 /* StringLiteral */ ? type.value === "" ? 64 /* StringLiteral */ : 0 :
+                    type.flags & 128 /* NumberLiteral */ ? type.value === 0 ? 128 /* NumberLiteral */ : 0 :
+                        type.flags & 256 /* BooleanLiteral */ ? type === falseType ? 256 /* BooleanLiteral */ : 0 :
+                            type.flags & 29148 /* PossiblyFalsy */;
         }
         function removeDefinitelyFalsyTypes(type) {
-            return getFalsyFlags(type) & 29120 ?
-                filterType(type, function (t) { return !(getFalsyFlags(t) & 29120); }) :
+            return getFalsyFlags(type) & 29120 /* DefinitelyFalsy */ ?
+                filterType(type, function (t) { return !(getFalsyFlags(t) & 29120 /* DefinitelyFalsy */); }) :
                 type;
         }
         function extractDefinitelyFalsyTypes(type) {
             return mapType(type, getDefinitelyFalsyPartOfType);
         }
         function getDefinitelyFalsyPartOfType(type) {
-            return type.flags & 4 ? emptyStringType :
-                type.flags & 8 ? zeroType :
-                    type.flags & 16 || type === falseType ? falseType :
-                        type.flags & (4096 | 8192 | 16384) ||
-                            type.flags & 64 && type.value === "" ||
-                            type.flags & 128 && type.value === 0 ? type :
+            return type.flags & 4 /* String */ ? emptyStringType :
+                type.flags & 8 /* Number */ ? zeroType :
+                    type.flags & 16 /* Boolean */ || type === falseType ? falseType :
+                        type.flags & (4096 /* Void */ | 8192 /* Undefined */ | 16384 /* Null */) ||
+                            type.flags & 64 /* StringLiteral */ && type.value === "" ||
+                            type.flags & 128 /* NumberLiteral */ && type.value === 0 ? type :
                             neverType;
         }
+        /**
+         * Add undefined or null or both to a type if they are missing.
+         * @param type - type to add undefined and/or null to if not present
+         * @param flags - Either TypeFlags.Undefined or TypeFlags.Null, or both
+         */
         function getNullableType(type, flags) {
-            var missing = (flags & ~type.flags) & (8192 | 16384);
+            var missing = (flags & ~type.flags) & (8192 /* Undefined */ | 16384 /* Null */);
             return missing === 0 ? type :
-                missing === 8192 ? getUnionType([type, undefinedType]) :
-                    missing === 16384 ? getUnionType([type, nullType]) :
+                missing === 8192 /* Undefined */ ? getUnionType([type, undefinedType]) :
+                    missing === 16384 /* Null */ ? getUnionType([type, nullType]) :
                         getUnionType([type, undefinedType, nullType]);
         }
         function getOptionalType(type) {
             ts.Debug.assert(strictNullChecks);
-            return type.flags & 8192 ? type : getUnionType([type, undefinedType]);
+            return type.flags & 8192 /* Undefined */ ? type : getUnionType([type, undefinedType]);
         }
         function getGlobalNonNullableTypeInstantiation(type) {
             if (!deferredGlobalNonNullableTypeAlias) {
-                deferredGlobalNonNullableTypeAlias = getGlobalSymbol("NonNullable", 524288, undefined) || unknownSymbol;
+                deferredGlobalNonNullableTypeAlias = getGlobalSymbol("NonNullable", 524288 /* TypeAlias */, /*diagnostic*/ undefined) || unknownSymbol;
             }
+            // Use NonNullable global type alias if available to improve quick info/declaration emit
             if (deferredGlobalNonNullableTypeAlias !== unknownSymbol) {
                 return getTypeAliasInstantiation(deferredGlobalNonNullableTypeAlias, [type]);
             }
-            return getTypeWithFacts(type, 524288);
+            return getTypeWithFacts(type, 524288 /* NEUndefinedOrNull */); // Type alias unavailable, fall back to non-higherorder behavior
         }
         function getNonNullableType(type) {
             return strictNullChecks ? getGlobalNonNullableTypeInstantiation(type) : type;
         }
+        /**
+         * Return true if type was inferred from an object literal, written as an object type literal, or is the shape of a module
+         * with no call or construct signatures.
+         */
         function isObjectTypeWithInferableIndex(type) {
-            return type.symbol && (type.symbol.flags & (4096 | 2048 | 512)) !== 0 &&
+            return type.symbol && (type.symbol.flags & (4096 /* ObjectLiteral */ | 2048 /* TypeLiteral */ | 512 /* ValueModule */)) !== 0 &&
                 !typeHasCallOrConstructSignatures(type);
         }
         function createSymbolWithType(source, type) {
@@ -31164,8 +40126,13 @@ var ts;
             }
             return members;
         }
+        /**
+         * If the the provided object literal is subject to the excess properties check,
+         * create a new that is exempt. Recursively mark object literal members as exempt.
+         * Leave signatures alone since they are not subject to the check.
+         */
         function getRegularTypeOfObjectLiteral(type) {
-            if (!(isObjectLiteralType(type) && type.flags & 33554432)) {
+            if (!(isObjectLiteralType(type) && type.flags & 33554432 /* FreshLiteral */)) {
                 return type;
             }
             var regularType = type.regularType;
@@ -31175,8 +40142,8 @@ var ts;
             var resolved = type;
             var members = transformTypeOfMembers(type, getRegularTypeOfObjectLiteral);
             var regularNew = createAnonymousType(resolved.symbol, members, resolved.callSignatures, resolved.constructSignatures, resolved.stringIndexInfo, resolved.numberIndexInfo);
-            regularNew.flags = resolved.flags & ~33554432;
-            regularNew.objectFlags |= 128;
+            regularNew.flags = resolved.flags & ~33554432 /* FreshLiteral */;
+            regularNew.objectFlags |= 128 /* ObjectLiteral */;
             type.regularType = regularNew;
             return regularNew;
         }
@@ -31206,7 +40173,7 @@ var ts;
                 var names = ts.createMap();
                 for (var _i = 0, _a = getSiblingsOfContext(context); _i < _a.length; _i++) {
                     var t = _a[_i];
-                    if (isObjectLiteralType(t) && !(ts.getObjectFlags(t) & 1024)) {
+                    if (isObjectLiteralType(t) && !(ts.getObjectFlags(t) & 1024 /* ContainsSpread */)) {
                         for (var _b = 0, _c = getPropertiesOfType(t); _b < _c.length; _b++) {
                             var prop = _c[_b];
                             names.set(prop.escapedName, prop);
@@ -31218,8 +40185,21 @@ var ts;
             return context.resolvedProperties;
         }
         function getWidenedProperty(prop, context) {
+            if (!(prop.flags & 4 /* Property */)) {
+                // Since get accessors already widen their return value there is no need to
+                // widen accessor based properties here.
+                return prop;
+            }
+            if (prop.flags & 67108864 /* JSContainer */) {
+                var node = prop.declarations && ts.first(prop.declarations);
+                var init = ts.getAssignedJavascriptInitializer(node);
+                if (init && init.kind !== 184 /* ObjectLiteralExpression */) {
+                    // for JS special declarations, the only kind of initializer that will widen is object literals
+                    return prop;
+                }
+            }
             var original = getTypeOfSymbol(prop);
-            var propContext = context && createWideningContext(context, prop.escapedName, undefined);
+            var propContext = context && createWideningContext(context, prop.escapedName, /*siblings*/ undefined);
             var widened = getWidenedTypeWithContext(original, propContext);
             return widened === original ? prop : createSymbolWithType(prop, widened);
         }
@@ -31229,7 +40209,7 @@ var ts;
                 return cached;
             }
             var result = createSymbolWithType(prop, undefinedType);
-            result.flags |= 16777216;
+            result.flags |= 16777216 /* Optional */;
             undefinedProperties.set(prop.escapedName, result);
             return result;
         }
@@ -31237,7 +40217,7 @@ var ts;
             var members = ts.createSymbolTable();
             for (var _i = 0, _a = getPropertiesOfObjectType(type); _i < _a.length; _i++) {
                 var prop = _a[_i];
-                members.set(prop.escapedName, prop.flags & 4 ? getWidenedProperty(prop, context) : prop);
+                members.set(prop.escapedName, getWidenedProperty(prop, context));
             }
             if (context) {
                 for (var _b = 0, _c = getPropertiesOfContext(context); _b < _c.length; _b++) {
@@ -31247,25 +40227,28 @@ var ts;
                     }
                 }
             }
-            var stringIndexInfo = getIndexInfoOfType(type, 0);
-            var numberIndexInfo = getIndexInfoOfType(type, 1);
+            var stringIndexInfo = getIndexInfoOfType(type, 0 /* String */);
+            var numberIndexInfo = getIndexInfoOfType(type, 1 /* Number */);
             return createAnonymousType(type.symbol, members, ts.emptyArray, ts.emptyArray, stringIndexInfo && createIndexInfo(getWidenedType(stringIndexInfo.type), stringIndexInfo.isReadonly), numberIndexInfo && createIndexInfo(getWidenedType(numberIndexInfo.type), numberIndexInfo.isReadonly));
         }
         function getWidenedType(type) {
-            return getWidenedTypeWithContext(type, undefined);
+            return getWidenedTypeWithContext(type, /*context*/ undefined);
         }
         function getWidenedTypeWithContext(type, context) {
-            if (type.flags & 402653184) {
-                if (type.flags & 24576) {
+            if (type.flags & 402653184 /* RequiresWidening */) {
+                if (type.flags & 24576 /* Nullable */) {
                     return anyType;
                 }
                 if (isObjectLiteralType(type)) {
                     return getWidenedTypeOfObjectLiteral(type, context);
                 }
-                if (type.flags & 262144) {
-                    var unionContext_1 = context || createWideningContext(undefined, undefined, type.types);
-                    var widenedTypes = ts.sameMap(type.types, function (t) { return t.flags & 24576 ? t : getWidenedTypeWithContext(t, unionContext_1); });
-                    return getUnionType(widenedTypes, ts.some(widenedTypes, isEmptyObjectType) ? 2 : 1);
+                if (type.flags & 262144 /* Union */) {
+                    var unionContext_1 = context || createWideningContext(/*parent*/ undefined, /*propertyName*/ undefined, type.types);
+                    var widenedTypes = ts.sameMap(type.types, function (t) { return t.flags & 24576 /* Nullable */ ? t : getWidenedTypeWithContext(t, unionContext_1); });
+                    // Widening an empty object literal transitions from a highly restrictive type to
+                    // a highly inclusive one. For that reason we perform subtype reduction here if the
+                    // union includes empty object types (e.g. reducing {} | string to just {}).
+                    return getUnionType(widenedTypes, ts.some(widenedTypes, isEmptyObjectType) ? 2 /* Subtype */ : 1 /* Literal */);
                 }
                 if (isArrayType(type) || isTupleType(type)) {
                     return createTypeReference(type.target, ts.sameMap(type.typeArguments, getWidenedType));
@@ -31273,10 +40256,21 @@ var ts;
             }
             return type;
         }
+        /**
+         * Reports implicit any errors that occur as a result of widening 'null' and 'undefined'
+         * to 'any'. A call to reportWideningErrorsInType is normally accompanied by a call to
+         * getWidenedType. But in some cases getWidenedType is called without reporting errors
+         * (type argument inference is an example).
+         *
+         * The return value indicates whether an error was in fact reported. The particular circumstances
+         * are on a best effort basis. Currently, if the null or undefined that causes widening is inside
+         * an object literal property (arbitrarily deeply), this function reports an error. If no error is
+         * reported, reportImplicitAnyError is a suitable fallback to report a general error.
+         */
         function reportWideningErrorsInType(type) {
             var errorReported = false;
-            if (type.flags & 134217728) {
-                if (type.flags & 262144) {
+            if (type.flags & 134217728 /* ContainsWideningType */) {
+                if (type.flags & 262144 /* Union */) {
                     if (ts.some(type.types, isEmptyObjectType)) {
                         errorReported = true;
                     }
@@ -31301,7 +40295,7 @@ var ts;
                     for (var _d = 0, _e = getPropertiesOfObjectType(type); _d < _e.length; _d++) {
                         var p = _e[_d];
                         var t = getTypeOfSymbol(p);
-                        if (t.flags & 134217728) {
+                        if (t.flags & 134217728 /* ContainsWideningType */) {
                             if (!reportWideningErrorsInType(t)) {
                                 error(p.valueDeclaration, ts.Diagnostics.Object_literal_s_property_0_implicitly_has_an_1_type, symbolToString(p), typeToString(getWidenedType(t)));
                             }
@@ -31316,33 +40310,33 @@ var ts;
             var typeAsString = typeToString(getWidenedType(type));
             var diagnostic;
             switch (declaration.kind) {
-                case 200:
-                case 152:
-                case 151:
+                case 200 /* BinaryExpression */:
+                case 152 /* PropertyDeclaration */:
+                case 151 /* PropertySignature */:
                     diagnostic = ts.Diagnostics.Member_0_implicitly_has_an_1_type;
                     break;
-                case 149:
+                case 149 /* Parameter */:
                     diagnostic = declaration.dotDotDotToken ?
                         ts.Diagnostics.Rest_parameter_0_implicitly_has_an_any_type :
                         ts.Diagnostics.Parameter_0_implicitly_has_an_1_type;
                     break;
-                case 182:
+                case 182 /* BindingElement */:
                     diagnostic = ts.Diagnostics.Binding_element_0_implicitly_has_an_1_type;
                     break;
-                case 234:
-                case 154:
-                case 153:
-                case 156:
-                case 157:
-                case 192:
-                case 193:
+                case 234 /* FunctionDeclaration */:
+                case 154 /* MethodDeclaration */:
+                case 153 /* MethodSignature */:
+                case 156 /* GetAccessor */:
+                case 157 /* SetAccessor */:
+                case 192 /* FunctionExpression */:
+                case 193 /* ArrowFunction */:
                     if (!declaration.name) {
                         error(declaration, ts.Diagnostics.Function_expression_which_lacks_return_type_annotation_implicitly_has_an_0_return_type, typeAsString);
                         return;
                     }
                     diagnostic = ts.Diagnostics._0_which_lacks_return_type_annotation_implicitly_has_an_1_return_type;
                     break;
-                case 177:
+                case 177 /* MappedType */:
                     error(declaration, ts.Diagnostics.Mapped_object_type_implicitly_has_an_any_template_type);
                     return;
                 default:
@@ -31351,7 +40345,8 @@ var ts;
             error(declaration, diagnostic, ts.declarationNameToString(ts.getNameOfDeclaration(declaration)), typeAsString);
         }
         function reportErrorsFromWidening(declaration, type) {
-            if (produceDiagnostics && noImplicitAny && type.flags & 134217728) {
+            if (produceDiagnostics && noImplicitAny && type.flags & 134217728 /* ContainsWideningType */) {
+                // Report implicit any error within type if possible, otherwise report error on declaration
                 if (!reportWideningErrorsInType(type)) {
                     reportImplicitAnyError(declaration, type);
                 }
@@ -31418,13 +40413,16 @@ var ts;
                 isFixed: inference.isFixed
             };
         }
+        // Return true if the given type could possibly reference a type parameter for which
+        // we perform type inference (i.e. a type parameter of a generic function). We cache
+        // results for union and intersection types for performance reasons.
         function couldContainTypeVariables(type) {
             var objectFlags = ts.getObjectFlags(type);
-            return !!(type.flags & 15794176 ||
-                objectFlags & 4 && ts.forEach(type.typeArguments, couldContainTypeVariables) ||
-                objectFlags & 16 && type.symbol && type.symbol.flags & (16 | 8192 | 2048 | 32) ||
-                objectFlags & 32 ||
-                type.flags & 786432 && couldUnionOrIntersectionContainTypeVariables(type));
+            return !!(type.flags & 15794176 /* Instantiable */ ||
+                objectFlags & 4 /* Reference */ && ts.forEach(type.typeArguments, couldContainTypeVariables) ||
+                objectFlags & 16 /* Anonymous */ && type.symbol && type.symbol.flags & (16 /* Function */ | 8192 /* Method */ | 2048 /* TypeLiteral */ | 32 /* Class */) ||
+                objectFlags & 32 /* Mapped */ ||
+                type.flags & 786432 /* UnionOrIntersection */ && couldUnionOrIntersectionContainTypeVariables(type));
         }
         function couldUnionOrIntersectionContainTypeVariables(type) {
             if (type.couldContainTypeVariables === undefined) {
@@ -31433,16 +40431,17 @@ var ts;
             return type.couldContainTypeVariables;
         }
         function isTypeParameterAtTopLevel(type, typeParameter) {
-            return type === typeParameter || !!(type.flags & 786432) && ts.some(type.types, function (t) { return isTypeParameterAtTopLevel(t, typeParameter); });
+            return type === typeParameter || !!(type.flags & 786432 /* UnionOrIntersection */) && ts.some(type.types, function (t) { return isTypeParameterAtTopLevel(t, typeParameter); });
         }
+        /** Create an object with properties named in the string literal type. Every property has type `any` */
         function createEmptyObjectTypeFromStringLiteral(type) {
             var members = ts.createSymbolTable();
             forEachType(type, function (t) {
-                if (!(t.flags & 64)) {
+                if (!(t.flags & 64 /* StringLiteral */)) {
                     return;
                 }
                 var name = ts.escapeLeadingUnderscores(t.value);
-                var literalProp = createSymbol(4, name);
+                var literalProp = createSymbol(4 /* Property */, name);
                 literalProp.type = anyType;
                 if (t.symbol) {
                     literalProp.declarations = t.symbol.declarations;
@@ -31450,9 +40449,15 @@ var ts;
                 }
                 members.set(name, literalProp);
             });
-            var indexInfo = type.flags & 4 ? createIndexInfo(emptyObjectType, false) : undefined;
+            var indexInfo = type.flags & 4 /* String */ ? createIndexInfo(emptyObjectType, /*isReadonly*/ false) : undefined;
             return createAnonymousType(undefined, members, ts.emptyArray, ts.emptyArray, indexInfo, undefined);
         }
+        /**
+         * Infer a suitable input type for a homomorphic mapped type { [P in keyof T]: X }. We construct
+         * an object type with the same set of properties as the source type, where the type of each
+         * property is computed by inferring from the source property type to X for the type
+         * variable T[P] (i.e. we treat the type T[P] as the type variable we're inferring for).
+         */
         function inferTypeForHomomorphicMappedType(source, target) {
             var key = source.id + "," + target.id;
             if (reverseMappedCache.has(key)) {
@@ -31465,16 +40470,18 @@ var ts;
         }
         function createReverseMappedType(source, target) {
             var properties = getPropertiesOfType(source);
-            if (properties.length === 0 && !getIndexInfoOfType(source, 0)) {
+            if (properties.length === 0 && !getIndexInfoOfType(source, 0 /* String */)) {
                 return undefined;
             }
+            // If any property contains context sensitive functions that have been skipped, the source type
+            // is incomplete and we can't infer a meaningful input type.
             for (var _i = 0, properties_4 = properties; _i < properties_4.length; _i++) {
                 var prop = properties_4[_i];
-                if (getTypeOfSymbol(prop).flags & 536870912) {
+                if (getTypeOfSymbol(prop).flags & 536870912 /* ContainsAnyFunctionType */) {
                     return undefined;
                 }
             }
-            var reversed = createObjectType(2048 | 16, undefined);
+            var reversed = createObjectType(2048 /* ReverseMapped */ | 16 /* Anonymous */, /*symbol*/ undefined);
             reversed.source = source;
             reversed.mappedType = target;
             return reversed;
@@ -31490,10 +40497,10 @@ var ts;
             return getTypeFromInference(inference);
         }
         function getUnmatchedProperty(source, target, requireOptionalProperties) {
-            var properties = target.flags & 524288 ? getPropertiesOfUnionOrIntersectionType(target) : getPropertiesOfObjectType(target);
+            var properties = target.flags & 524288 /* Intersection */ ? getPropertiesOfUnionOrIntersectionType(target) : getPropertiesOfObjectType(target);
             for (var _i = 0, properties_5 = properties; _i < properties_5.length; _i++) {
                 var targetProp = properties_5[_i];
-                if (requireOptionalProperties || !(targetProp.flags & 16777216)) {
+                if (requireOptionalProperties || !(targetProp.flags & 16777216 /* Optional */)) {
                     var sourceProp = getPropertyOfType(source, targetProp.escapedName);
                     if (!sourceProp) {
                         return targetProp;
@@ -31503,11 +40510,13 @@ var ts;
             return undefined;
         }
         function typesDefinitelyUnrelated(source, target) {
+            // Two tuple types with different arity are definitely unrelated.
+            // Two object types that each have a property that is unmatched in the other are definitely unrelated.
             return isTupleType(source) && isTupleType(target) && getTypeReferenceArity(source) !== getTypeReferenceArity(target) ||
-                !!getUnmatchedProperty(source, target, false) && !!getUnmatchedProperty(target, source, false);
+                !!getUnmatchedProperty(source, target, /*requireOptionalProperties*/ false) && !!getUnmatchedProperty(target, source, /*requireOptionalProperties*/ false);
         }
         function getTypeFromInference(inference) {
-            return inference.candidates ? getUnionType(inference.candidates, 2) :
+            return inference.candidates ? getUnionType(inference.candidates, 2 /* Subtype */) :
                 inference.contraCandidates ? getIntersectionType(inference.contraCandidates) :
                     emptyObjectType;
         }
@@ -31523,6 +40532,9 @@ var ts;
                     return;
                 }
                 if (source === wildcardType) {
+                    // We are inferring from an 'any' type. We want to infer this type for every type parameter
+                    // referenced in the target type, so we record it as the propagation type and infer from the
+                    // target to itself. Then, as we find candidates we substitute the propagation type.
                     var savePropagationType = propagationType;
                     propagationType = source;
                     inferFromTypes(target, target);
@@ -31530,6 +40542,8 @@ var ts;
                     return;
                 }
                 if (source.aliasSymbol && source.aliasTypeArguments && source.aliasSymbol === target.aliasSymbol) {
+                    // Source and target are types originating in the same generic type alias declaration.
+                    // Simply infer from source type arguments to target type arguments.
                     var sourceTypes = source.aliasTypeArguments;
                     var targetTypes = target.aliasTypeArguments;
                     for (var i = 0; i < sourceTypes.length; i++) {
@@ -31537,8 +40551,10 @@ var ts;
                     }
                     return;
                 }
-                if (source.flags & 262144 && target.flags & 262144 && !(source.flags & 512 && target.flags & 512) ||
-                    source.flags & 524288 && target.flags & 524288) {
+                if (source.flags & 262144 /* Union */ && target.flags & 262144 /* Union */ && !(source.flags & 512 /* EnumLiteral */ && target.flags & 512 /* EnumLiteral */) ||
+                    source.flags & 524288 /* Intersection */ && target.flags & 524288 /* Intersection */) {
+                    // Source and target are both unions or both intersections. If source and target
+                    // are the same type, just relate each constituent type to itself.
                     if (source === target) {
                         for (var _i = 0, _a = source.types; _i < _a.length; _i++) {
                             var t = _a[_i];
@@ -31546,6 +40562,12 @@ var ts;
                         }
                         return;
                     }
+                    // Find each source constituent type that has an identically matching target constituent
+                    // type, and for each such type infer from the type to itself. When inferring from a
+                    // type to itself we effectively find all type parameter occurrences within that type
+                    // and infer themselves as their type arguments. We have special handling for numeric
+                    // and string literals because the number and string types are not represented as unions
+                    // of all their possible values.
                     var matchingTypes = void 0;
                     for (var _b = 0, _c = source.types; _b < _c.length; _b++) {
                         var t = _c[_b];
@@ -31553,20 +40575,30 @@ var ts;
                             (matchingTypes || (matchingTypes = [])).push(t);
                             inferFromTypes(t, t);
                         }
-                        else if (t.flags & (128 | 64)) {
+                        else if (t.flags & (128 /* NumberLiteral */ | 64 /* StringLiteral */)) {
                             var b = getBaseTypeOfLiteralType(t);
                             if (typeIdenticalToSomeType(b, target.types)) {
                                 (matchingTypes || (matchingTypes = [])).push(t, b);
                             }
                         }
                     }
+                    // Next, to improve the quality of inferences, reduce the source and target types by
+                    // removing the identically matched constituents. For example, when inferring from
+                    // 'string | string[]' to 'string | T' we reduce the types to 'string[]' and 'T'.
                     if (matchingTypes) {
                         source = removeTypesFromUnionOrIntersection(source, matchingTypes);
                         target = removeTypesFromUnionOrIntersection(target, matchingTypes);
                     }
                 }
-                if (target.flags & 2162688) {
-                    if (source.flags & 536870912 || source === silentNeverType) {
+                if (target.flags & 2162688 /* TypeVariable */) {
+                    // If target is a type parameter, make an inference, unless the source type contains
+                    // the anyFunctionType (the wildcard type that's used to avoid contextually typing functions).
+                    // Because the anyFunctionType is internal, it should not be exposed to the user by adding
+                    // it as an inference candidate. Hopefully, a better candidate will come along that does
+                    // not contain anyFunctionType when we come back to this argument for its second round
+                    // of inference. Also, we exclude inferences for silentNeverType (which is used as a wildcard
+                    // when constructing types from type parameters that had no inference candidates).
+                    if (source.flags & 536870912 /* ContainsAnyFunctionType */ || source === silentNeverType) {
                         return;
                     }
                     var inference = getInferenceInfoForType(target);
@@ -31586,20 +40618,21 @@ var ts;
                                     inference.candidates = ts.append(inference.candidates, candidate);
                                 }
                             }
-                            if (!(priority & 8) && target.flags & 65536 && !isTypeParameterAtTopLevel(originalTarget, target)) {
+                            if (!(priority & 8 /* ReturnType */) && target.flags & 65536 /* TypeParameter */ && !isTypeParameterAtTopLevel(originalTarget, target)) {
                                 inference.topLevel = false;
                             }
                         }
                         return;
                     }
                 }
-                if (ts.getObjectFlags(source) & 4 && ts.getObjectFlags(target) & 4 && source.target === target.target) {
+                if (ts.getObjectFlags(source) & 4 /* Reference */ && ts.getObjectFlags(target) & 4 /* Reference */ && source.target === target.target) {
+                    // If source and target are references to the same generic type, infer from type arguments
                     var sourceTypes = source.typeArguments || ts.emptyArray;
                     var targetTypes = target.typeArguments || ts.emptyArray;
                     var count = sourceTypes.length < targetTypes.length ? sourceTypes.length : targetTypes.length;
                     var variances = getVariances(source.target);
                     for (var i = 0; i < count; i++) {
-                        if (i < variances.length && variances[i] === 2) {
+                        if (i < variances.length && variances[i] === 2 /* Contravariant */) {
                             inferFromContravariantTypes(sourceTypes[i], targetTypes[i]);
                         }
                         else {
@@ -31607,34 +40640,35 @@ var ts;
                         }
                     }
                 }
-                else if (source.flags & 1048576 && target.flags & 1048576) {
+                else if (source.flags & 1048576 /* Index */ && target.flags & 1048576 /* Index */) {
                     contravariant = !contravariant;
                     inferFromTypes(source.type, target.type);
                     contravariant = !contravariant;
                 }
-                else if ((isLiteralType(source) || source.flags & 4) && target.flags & 1048576) {
+                else if ((isLiteralType(source) || source.flags & 4 /* String */) && target.flags & 1048576 /* Index */) {
                     var empty = createEmptyObjectTypeFromStringLiteral(source);
                     contravariant = !contravariant;
                     var savePriority = priority;
-                    priority |= 16;
+                    priority |= 16 /* LiteralKeyof */;
                     inferFromTypes(empty, target.type);
                     priority = savePriority;
                     contravariant = !contravariant;
                 }
-                else if (source.flags & 2097152 && target.flags & 2097152) {
+                else if (source.flags & 2097152 /* IndexedAccess */ && target.flags & 2097152 /* IndexedAccess */) {
                     inferFromTypes(source.objectType, target.objectType);
                     inferFromTypes(source.indexType, target.indexType);
                 }
-                else if (source.flags & 4194304 && target.flags & 4194304) {
+                else if (source.flags & 4194304 /* Conditional */ && target.flags & 4194304 /* Conditional */) {
                     inferFromTypes(source.checkType, target.checkType);
                     inferFromTypes(source.extendsType, target.extendsType);
                     inferFromTypes(getTrueTypeFromConditionalType(source), getTrueTypeFromConditionalType(target));
                     inferFromTypes(getFalseTypeFromConditionalType(source), getFalseTypeFromConditionalType(target));
                 }
-                else if (target.flags & 786432) {
+                else if (target.flags & 786432 /* UnionOrIntersection */) {
                     var targetTypes = target.types;
                     var typeVariableCount = 0;
                     var typeVariable = void 0;
+                    // First infer to each type in union or intersection that isn't a type variable
                     for (var _d = 0, targetTypes_3 = targetTypes; _d < targetTypes_3.length; _d++) {
                         var t = targetTypes_3[_d];
                         if (getInferenceInfoForType(t)) {
@@ -31645,14 +40679,18 @@ var ts;
                             inferFromTypes(source, t);
                         }
                     }
+                    // Next, if target containings a single naked type variable, make a secondary inference to that type
+                    // variable. This gives meaningful results for union types in co-variant positions and intersection
+                    // types in contra-variant positions (such as callback parameters).
                     if (typeVariableCount === 1) {
                         var savePriority = priority;
-                        priority |= 1;
+                        priority |= 1 /* NakedTypeVariable */;
                         inferFromTypes(source, typeVariable);
                         priority = savePriority;
                     }
                 }
-                else if (source.flags & 262144) {
+                else if (source.flags & 262144 /* Union */) {
+                    // Source is a union or intersection type, infer from each constituent type
                     var sourceTypes = source.types;
                     for (var _e = 0, sourceTypes_3 = sourceTypes; _e < sourceTypes_3.length; _e++) {
                         var sourceType = sourceTypes_3[_e];
@@ -31660,17 +40698,21 @@ var ts;
                     }
                 }
                 else {
-                    if (!(priority & 32 && source.flags & (524288 | 15794176))) {
+                    if (!(priority & 32 /* NoConstraints */ && source.flags & (524288 /* Intersection */ | 15794176 /* Instantiable */))) {
                         source = getApparentType(source);
                     }
-                    if (source.flags & (131072 | 524288)) {
+                    if (source.flags & (131072 /* Object */ | 524288 /* Intersection */)) {
                         var key = source.id + "," + target.id;
                         if (visited && visited.get(key)) {
                             return;
                         }
                         (visited || (visited = ts.createMap())).set(key, true);
-                        var isNonConstructorObject = target.flags & 131072 &&
-                            !(ts.getObjectFlags(target) & 16 && target.symbol && target.symbol.flags & 32);
+                        // If we are already processing another target type with the same associated symbol (such as
+                        // an instantiation of the same generic type), we do not explore this target as it would yield
+                        // no further inferences. We exclude the static side of classes from this check since it shares
+                        // its symbol with the instance side which would lead to false positives.
+                        var isNonConstructorObject = target.flags & 131072 /* Object */ &&
+                            !(ts.getObjectFlags(target) & 16 /* Anonymous */ && target.symbol && target.symbol.flags & 32 /* Class */);
                         var symbol = isNonConstructorObject ? target.symbol : undefined;
                         if (symbol) {
                             if (ts.contains(symbolStack, symbol)) {
@@ -31687,7 +40729,7 @@ var ts;
                 }
             }
             function inferFromContravariantTypes(source, target) {
-                if (strictFunctionTypes || priority & 64) {
+                if (strictFunctionTypes || priority & 64 /* AlwaysStrict */) {
                     contravariant = !contravariant;
                     inferFromTypes(source, target);
                     contravariant = !contravariant;
@@ -31697,7 +40739,7 @@ var ts;
                 }
             }
             function getInferenceInfoForType(type) {
-                if (type.flags & 2162688) {
+                if (type.flags & 2162688 /* TypeVariable */) {
                     for (var _i = 0, inferences_1 = inferences; _i < inferences_1.length; _i++) {
                         var inference = inferences_1[_i];
                         if (type === inference.typeParameter) {
@@ -31709,37 +40751,46 @@ var ts;
             }
             function inferFromObjectTypes(source, target) {
                 if (isGenericMappedType(source) && isGenericMappedType(target)) {
+                    // The source and target types are generic types { [P in S]: X } and { [P in T]: Y }, so we infer
+                    // from S to T and from X to Y.
                     inferFromTypes(getConstraintTypeFromMappedType(source), getConstraintTypeFromMappedType(target));
                     inferFromTypes(getTemplateTypeFromMappedType(source), getTemplateTypeFromMappedType(target));
                 }
-                if (ts.getObjectFlags(target) & 32) {
+                if (ts.getObjectFlags(target) & 32 /* Mapped */) {
                     var constraintType = getConstraintTypeFromMappedType(target);
-                    if (constraintType.flags & 1048576) {
+                    if (constraintType.flags & 1048576 /* Index */) {
+                        // We're inferring from some source type S to a homomorphic mapped type { [P in keyof T]: X },
+                        // where T is a type variable. Use inferTypeForHomomorphicMappedType to infer a suitable source
+                        // type and then make a secondary inference from that type to T. We make a secondary inference
+                        // such that direct inferences to T get priority over inferences to Partial<T>, for example.
                         var inference = getInferenceInfoForType(constraintType.type);
                         if (inference && !inference.isFixed) {
                             var inferredType = inferTypeForHomomorphicMappedType(source, target);
                             if (inferredType) {
                                 var savePriority = priority;
-                                priority |= 2;
+                                priority |= 2 /* HomomorphicMappedType */;
                                 inferFromTypes(inferredType, inference.typeParameter);
                                 priority = savePriority;
                             }
                         }
                         return;
                     }
-                    if (constraintType.flags & 65536) {
+                    if (constraintType.flags & 65536 /* TypeParameter */) {
+                        // We're inferring from some source type S to a mapped type { [P in T]: X }, where T is a type
+                        // parameter. Infer from 'keyof S' to T and infer from a union of each property type in S to X.
                         var savePriority = priority;
-                        priority |= 4;
+                        priority |= 4 /* MappedTypeConstraint */;
                         inferFromTypes(getIndexType(source), constraintType);
                         priority = savePriority;
                         inferFromTypes(getUnionType(ts.map(getPropertiesOfType(source), getTypeOfSymbol)), getTemplateTypeFromMappedType(target));
                         return;
                     }
                 }
+                // Infer from the members of source and target only if the two types are possibly related
                 if (!typesDefinitelyUnrelated(source, target)) {
                     inferFromProperties(source, target);
-                    inferFromSignatures(source, target, 0);
-                    inferFromSignatures(source, target, 1);
+                    inferFromSignatures(source, target, 0 /* Call */);
+                    inferFromSignatures(source, target, 1 /* Construct */);
                     inferFromIndexTypes(source, target);
                 }
             }
@@ -31775,19 +40826,19 @@ var ts;
                 }
             }
             function inferFromIndexTypes(source, target) {
-                var targetStringIndexType = getIndexTypeOfType(target, 0);
+                var targetStringIndexType = getIndexTypeOfType(target, 0 /* String */);
                 if (targetStringIndexType) {
-                    var sourceIndexType = getIndexTypeOfType(source, 0) ||
-                        getImplicitIndexTypeOfType(source, 0);
+                    var sourceIndexType = getIndexTypeOfType(source, 0 /* String */) ||
+                        getImplicitIndexTypeOfType(source, 0 /* String */);
                     if (sourceIndexType) {
                         inferFromTypes(sourceIndexType, targetStringIndexType);
                     }
                 }
-                var targetNumberIndexType = getIndexTypeOfType(target, 1);
+                var targetNumberIndexType = getIndexTypeOfType(target, 1 /* Number */);
                 if (targetNumberIndexType) {
-                    var sourceIndexType = getIndexTypeOfType(source, 1) ||
-                        getIndexTypeOfType(source, 0) ||
-                        getImplicitIndexTypeOfType(source, 1);
+                    var sourceIndexType = getIndexTypeOfType(source, 1 /* Number */) ||
+                        getIndexTypeOfType(source, 0 /* String */) ||
+                        getImplicitIndexTypeOfType(source, 1 /* Number */);
                     if (sourceIndexType) {
                         inferFromTypes(sourceIndexType, targetNumberIndexType);
                     }
@@ -31803,6 +40854,10 @@ var ts;
             }
             return false;
         }
+        /**
+         * Return a new union or intersection type computed by removing a given set of types
+         * from a given union or intersection type.
+         */
         function removeTypesFromUnionOrIntersection(type, typesToRemove) {
             var reducedTypes = [];
             for (var _i = 0, _a = type.types; _i < _a.length; _i++) {
@@ -31811,38 +40866,46 @@ var ts;
                     reducedTypes.push(t);
                 }
             }
-            return type.flags & 262144 ? getUnionType(reducedTypes) : getIntersectionType(reducedTypes);
+            return type.flags & 262144 /* Union */ ? getUnionType(reducedTypes) : getIntersectionType(reducedTypes);
         }
         function hasPrimitiveConstraint(type) {
             var constraint = getConstraintOfTypeParameter(type);
-            return !!constraint && maybeTypeOfKind(constraint, 32764 | 1048576);
+            return !!constraint && maybeTypeOfKind(constraint, 32764 /* Primitive */ | 1048576 /* Index */);
         }
         function isObjectLiteralType(type) {
-            return !!(ts.getObjectFlags(type) & 128);
+            return !!(ts.getObjectFlags(type) & 128 /* ObjectLiteral */);
         }
         function widenObjectLiteralCandidates(candidates) {
             if (candidates.length > 1) {
                 var objectLiterals = ts.filter(candidates, isObjectLiteralType);
                 if (objectLiterals.length) {
-                    var objectLiteralsType = getWidenedType(getUnionType(objectLiterals, 2));
+                    var objectLiteralsType = getWidenedType(getUnionType(objectLiterals, 2 /* Subtype */));
                     return ts.concatenate(ts.filter(candidates, function (t) { return !isObjectLiteralType(t); }), [objectLiteralsType]);
                 }
             }
             return candidates;
         }
         function getContravariantInference(inference) {
-            return inference.priority & 28 ? getIntersectionType(inference.contraCandidates) : getCommonSubtype(inference.contraCandidates);
+            return inference.priority & 28 /* PriorityImpliesCombination */ ? getIntersectionType(inference.contraCandidates) : getCommonSubtype(inference.contraCandidates);
         }
         function getCovariantInference(inference, context, signature) {
+            // Extract all object literal types and replace them with a single widened and normalized type.
             var candidates = widenObjectLiteralCandidates(inference.candidates);
+            // We widen inferred literal types if
+            // all inferences were made to top-level occurrences of the type parameter, and
+            // the type parameter has no constraint or its constraint includes no primitive or literal types, and
+            // the type parameter was fixed during inference or does not occur at top-level in the return type.
             var primitiveConstraint = hasPrimitiveConstraint(inference.typeParameter);
             var widenLiteralTypes = !primitiveConstraint && inference.topLevel &&
                 (inference.isFixed || !isTypeParameterAtTopLevel(getReturnTypeOfSignature(signature), inference.typeParameter));
             var baseCandidates = primitiveConstraint ? ts.sameMap(candidates, getRegularTypeOfLiteralType) :
                 widenLiteralTypes ? ts.sameMap(candidates, getWidenedLiteralType) :
                     candidates;
-            var unwidenedType = context.flags & 1 || inference.priority & 28 ?
-                getUnionType(baseCandidates, 2) :
+            // If all inferences were made from contravariant positions, infer a common subtype. Otherwise, if
+            // union types were requested or if all inferences were made from the return type position, infer a
+            // union type. Otherwise, infer a common supertype.
+            var unwidenedType = context.flags & 1 /* InferUnionTypes */ || inference.priority & 28 /* PriorityImpliesCombination */ ?
+                getUnionType(baseCandidates, 2 /* Subtype */) :
                 getCommonSupertype(baseCandidates);
             return getWidenedType(unwidenedType);
         }
@@ -31854,23 +40917,34 @@ var ts;
                 if (signature) {
                     if (inference.candidates) {
                         inferredType = getCovariantInference(inference, context, signature);
-                        if (inferredType.flags & 32768 && inference.contraCandidates) {
+                        // If we have inferred 'never' but have contravariant candidates. To get a more specific type we
+                        // infer from the contravariant candidates instead.
+                        if (inferredType.flags & 32768 /* Never */ && inference.contraCandidates) {
                             inferredType = getContravariantInference(inference);
                         }
                     }
                     else if (inference.contraCandidates) {
+                        // We only have contravariant inferences, infer the best common subtype of those
                         inferredType = getContravariantInference(inference);
                     }
-                    else if (context.flags & 2) {
+                    else if (context.flags & 2 /* NoDefault */) {
+                        // We use silentNeverType as the wildcard that signals no inferences.
                         inferredType = silentNeverType;
                     }
                     else {
+                        // Infer either the default or the empty object type when no inferences were
+                        // made. It is important to remember that in this case, inference still
+                        // succeeds, meaning there is no error for not having inference candidates. An
+                        // inference error only occurs when there are *conflicting* candidates, i.e.
+                        // candidates with no common supertype.
                         var defaultType = getDefaultFromTypeParameter(inference.typeParameter);
                         if (defaultType) {
+                            // Instantiate the default type. Any forward reference to a type
+                            // parameter should be instantiated to the empty object type.
                             inferredType = instantiateType(defaultType, combineTypeMappers(createBackreferenceMapper(context.signature.typeParameters, index), context));
                         }
                         else {
-                            inferredType = getDefaultTypeArgumentType(!!(context.flags & 4));
+                            inferredType = getDefaultTypeArgumentType(!!(context.flags & 4 /* AnyDefault */));
                         }
                     }
                 }
@@ -31898,32 +40972,43 @@ var ts;
             }
             return result;
         }
+        // EXPRESSION TYPE CHECKING
         function getResolvedSymbol(node) {
             var links = getNodeLinks(node);
             if (!links.resolvedSymbol) {
                 links.resolvedSymbol = !ts.nodeIsMissing(node) &&
-                    resolveName(node, node.escapedText, 67216319 | 1048576, ts.Diagnostics.Cannot_find_name_0, node, !ts.isWriteOnlyAccess(node), false, ts.Diagnostics.Cannot_find_name_0_Did_you_mean_1) || unknownSymbol;
+                    resolveName(node, node.escapedText, 67216319 /* Value */ | 1048576 /* ExportValue */, ts.Diagnostics.Cannot_find_name_0, node, !ts.isWriteOnlyAccess(node), 
+                    /*excludeGlobals*/ false, ts.Diagnostics.Cannot_find_name_0_Did_you_mean_1) || unknownSymbol;
             }
             return links.resolvedSymbol;
         }
         function isInTypeQuery(node) {
-            return !!ts.findAncestor(node, function (n) { return n.kind === 165 ? true : n.kind === 71 || n.kind === 146 ? false : "quit"; });
+            // TypeScript 1.0 spec (April 2014): 3.6.3
+            // A type query consists of the keyword typeof followed by an expression.
+            // The expression is restricted to a single identifier or a sequence of identifiers separated by periods
+            return !!ts.findAncestor(node, function (n) { return n.kind === 165 /* TypeQuery */ ? true : n.kind === 71 /* Identifier */ || n.kind === 146 /* QualifiedName */ ? false : "quit"; });
         }
+        // Return the flow cache key for a "dotted name" (i.e. a sequence of identifiers
+        // separated by dots). The key consists of the id of the symbol referenced by the
+        // leftmost identifier followed by zero or more property names separated by dots.
+        // The result is undefined if the reference isn't a dotted name. We prefix nodes
+        // occurring in an apparent type position with '@' because the control flow type
+        // of such nodes may be based on the apparent type instead of the declared type.
         function getFlowCacheKey(node) {
-            if (node.kind === 71) {
+            if (node.kind === 71 /* Identifier */) {
                 var symbol = getResolvedSymbol(node);
                 return symbol !== unknownSymbol ? (isConstraintPosition(node) ? "@" : "") + getSymbolId(symbol) : undefined;
             }
-            if (node.kind === 99) {
+            if (node.kind === 99 /* ThisKeyword */) {
                 return "0";
             }
-            if (node.kind === 185) {
+            if (node.kind === 185 /* PropertyAccessExpression */) {
                 var key = getFlowCacheKey(node.expression);
                 return key && key + "." + ts.idText(node.name);
             }
-            if (node.kind === 182) {
+            if (node.kind === 182 /* BindingElement */) {
                 var container = node.parent.parent;
-                var key = container.kind === 182 ? getFlowCacheKey(container) : (container.initializer && getFlowCacheKey(container.initializer));
+                var key = container.kind === 182 /* BindingElement */ ? getFlowCacheKey(container) : (container.initializer && getFlowCacheKey(container.initializer));
                 var text = getBindingElementNameText(node);
                 var result = key && text && (key + "." + text);
                 return result;
@@ -31932,17 +41017,18 @@ var ts;
         }
         function getBindingElementNameText(element) {
             var parent = element.parent;
-            if (parent.kind === 180) {
+            if (parent.kind === 180 /* ObjectBindingPattern */) {
                 var name = element.propertyName || element.name;
                 switch (name.kind) {
-                    case 71:
+                    case 71 /* Identifier */:
                         return ts.idText(name);
-                    case 147:
+                    case 147 /* ComputedPropertyName */:
                         return ts.isStringOrNumericLiteral(name.expression) ? name.expression.text : undefined;
-                    case 9:
-                    case 8:
+                    case 9 /* StringLiteral */:
+                    case 8 /* NumericLiteral */:
                         return name.text;
                     default:
+                        // Per types, array and object binding patterns remain, however they should never be present if propertyName is not defined
                         ts.Debug.fail("Unexpected name kind for binding element name");
                 }
             }
@@ -31952,28 +41038,28 @@ var ts;
         }
         function isMatchingReference(source, target) {
             switch (source.kind) {
-                case 71:
-                    return target.kind === 71 && getResolvedSymbol(source) === getResolvedSymbol(target) ||
-                        (target.kind === 232 || target.kind === 182) &&
+                case 71 /* Identifier */:
+                    return target.kind === 71 /* Identifier */ && getResolvedSymbol(source) === getResolvedSymbol(target) ||
+                        (target.kind === 232 /* VariableDeclaration */ || target.kind === 182 /* BindingElement */) &&
                             getExportSymbolOfValueSymbolIfExported(getResolvedSymbol(source)) === getSymbolOfNode(target);
-                case 99:
-                    return target.kind === 99;
-                case 97:
-                    return target.kind === 97;
-                case 185:
-                    return target.kind === 185 &&
+                case 99 /* ThisKeyword */:
+                    return target.kind === 99 /* ThisKeyword */;
+                case 97 /* SuperKeyword */:
+                    return target.kind === 97 /* SuperKeyword */;
+                case 185 /* PropertyAccessExpression */:
+                    return target.kind === 185 /* PropertyAccessExpression */ &&
                         source.name.escapedText === target.name.escapedText &&
                         isMatchingReference(source.expression, target.expression);
-                case 182:
-                    if (target.kind !== 185)
+                case 182 /* BindingElement */:
+                    if (target.kind !== 185 /* PropertyAccessExpression */)
                         return false;
                     var t = target;
                     if (t.name.escapedText !== getBindingElementNameText(source))
                         return false;
-                    if (source.parent.parent.kind === 182 && isMatchingReference(source.parent.parent, t.expression)) {
+                    if (source.parent.parent.kind === 182 /* BindingElement */ && isMatchingReference(source.parent.parent, t.expression)) {
                         return true;
                     }
-                    if (source.parent.parent.kind === 232) {
+                    if (source.parent.parent.kind === 232 /* VariableDeclaration */) {
                         var maybeId = source.parent.parent.initializer;
                         return !!maybeId && isMatchingReference(maybeId, t.expression);
                     }
@@ -31981,7 +41067,7 @@ var ts;
             return false;
         }
         function containsMatchingReference(source, target) {
-            while (source.kind === 185) {
+            while (source.kind === 185 /* PropertyAccessExpression */) {
                 source = source.expression;
                 if (isMatchingReference(source, target)) {
                     return true;
@@ -31989,27 +41075,31 @@ var ts;
             }
             return false;
         }
+        // Return true if target is a property access xxx.yyy, source is a property access xxx.zzz, the declared
+        // type of xxx is a union type, and yyy is a property that is possibly a discriminant. We consider a property
+        // a possible discriminant if its type differs in the constituents of containing union type, and if every
+        // choice is a unit type or a union of unit types.
         function containsMatchingReferenceDiscriminant(source, target) {
-            return target.kind === 185 &&
+            return target.kind === 185 /* PropertyAccessExpression */ &&
                 containsMatchingReference(source, target.expression) &&
                 isDiscriminantProperty(getDeclaredTypeOfReference(target.expression), target.name.escapedText);
         }
         function getDeclaredTypeOfReference(expr) {
-            if (expr.kind === 71) {
+            if (expr.kind === 71 /* Identifier */) {
                 return getTypeOfSymbol(getResolvedSymbol(expr));
             }
-            if (expr.kind === 185) {
+            if (expr.kind === 185 /* PropertyAccessExpression */) {
                 var type = getDeclaredTypeOfReference(expr.expression);
                 return type && getTypeOfPropertyOfType(type, expr.name.escapedText);
             }
             return undefined;
         }
         function isDiscriminantProperty(type, name) {
-            if (type && type.flags & 262144) {
+            if (type && type.flags & 262144 /* Union */) {
                 var prop = getUnionOrIntersectionProperty(type, name);
-                if (prop && ts.getCheckFlags(prop) & 2) {
+                if (prop && ts.getCheckFlags(prop) & 2 /* SyntheticProperty */) {
                     if (prop.isDiscriminantProperty === undefined) {
-                        prop.isDiscriminantProperty = !!(prop.checkFlags & 32) && isLiteralType(getTypeOfSymbol(prop));
+                        prop.isDiscriminantProperty = !!(prop.checkFlags & 32 /* HasNonUniformType */) && isLiteralType(getTypeOfSymbol(prop));
                     }
                     return prop.isDiscriminantProperty;
                 }
@@ -32042,7 +41132,7 @@ var ts;
                     }
                 }
             }
-            if (callExpression.expression.kind === 185 &&
+            if (callExpression.expression.kind === 185 /* PropertyAccessExpression */ &&
                 isOrContainsMatchingReference(reference, callExpression.expression.expression)) {
                 return true;
             }
@@ -32056,7 +41146,7 @@ var ts;
             return flow.id;
         }
         function typeMaybeAssignableTo(source, target) {
-            if (!(source.flags & 262144)) {
+            if (!(source.flags & 262144 /* Union */)) {
                 return isTypeAssignableTo(source, target);
             }
             for (var _i = 0, _a = source.types; _i < _a.length; _i++) {
@@ -32067,20 +41157,23 @@ var ts;
             }
             return false;
         }
+        // Remove those constituent types of declaredType to which no constituent type of assignedType is assignable.
+        // For example, when a variable of type number | string | boolean is assigned a value of type number | boolean,
+        // we remove type string.
         function getAssignmentReducedType(declaredType, assignedType) {
             if (declaredType !== assignedType) {
-                if (assignedType.flags & 32768) {
+                if (assignedType.flags & 32768 /* Never */) {
                     return assignedType;
                 }
                 var reducedType = filterType(declaredType, function (t) { return typeMaybeAssignableTo(assignedType, t); });
-                if (!(reducedType.flags & 32768)) {
+                if (!(reducedType.flags & 32768 /* Never */)) {
                     return reducedType;
                 }
             }
             return declaredType;
         }
         function getTypeFactsOfTypes(types) {
-            var result = 0;
+            var result = 0 /* None */;
             for (var _i = 0, types_12 = types; _i < types_12.length; _i++) {
                 var t = types_12[_i];
                 result |= getTypeFacts(t);
@@ -32088,62 +41181,64 @@ var ts;
             return result;
         }
         function isFunctionObjectType(type) {
+            // We do a quick check for a "bind" property before performing the more expensive subtype
+            // check. This gives us a quicker out in the common case where an object type is not a function.
             var resolved = resolveStructuredTypeMembers(type);
             return !!(resolved.callSignatures.length || resolved.constructSignatures.length ||
                 resolved.members.get("bind") && isTypeSubtypeOf(type, globalFunctionType));
         }
         function getTypeFacts(type) {
             var flags = type.flags;
-            if (flags & 4) {
-                return strictNullChecks ? 4079361 : 4194049;
+            if (flags & 4 /* String */) {
+                return strictNullChecks ? 4079361 /* StringStrictFacts */ : 4194049 /* StringFacts */;
             }
-            if (flags & 64) {
+            if (flags & 64 /* StringLiteral */) {
                 var isEmpty = type.value === "";
                 return strictNullChecks ?
-                    isEmpty ? 3030785 : 1982209 :
-                    isEmpty ? 3145473 : 4194049;
+                    isEmpty ? 3030785 /* EmptyStringStrictFacts */ : 1982209 /* NonEmptyStringStrictFacts */ :
+                    isEmpty ? 3145473 /* EmptyStringFacts */ : 4194049 /* NonEmptyStringFacts */;
             }
-            if (flags & (8 | 32)) {
-                return strictNullChecks ? 4079234 : 4193922;
+            if (flags & (8 /* Number */ | 32 /* Enum */)) {
+                return strictNullChecks ? 4079234 /* NumberStrictFacts */ : 4193922 /* NumberFacts */;
             }
-            if (flags & 128) {
+            if (flags & 128 /* NumberLiteral */) {
                 var isZero = type.value === 0;
                 return strictNullChecks ?
-                    isZero ? 3030658 : 1982082 :
-                    isZero ? 3145346 : 4193922;
+                    isZero ? 3030658 /* ZeroStrictFacts */ : 1982082 /* NonZeroStrictFacts */ :
+                    isZero ? 3145346 /* ZeroFacts */ : 4193922 /* NonZeroFacts */;
             }
-            if (flags & 16) {
-                return strictNullChecks ? 4078980 : 4193668;
+            if (flags & 16 /* Boolean */) {
+                return strictNullChecks ? 4078980 /* BooleanStrictFacts */ : 4193668 /* BooleanFacts */;
             }
-            if (flags & 272) {
+            if (flags & 272 /* BooleanLike */) {
                 return strictNullChecks ?
-                    type === falseType ? 3030404 : 1981828 :
-                    type === falseType ? 3145092 : 4193668;
+                    type === falseType ? 3030404 /* FalseStrictFacts */ : 1981828 /* TrueStrictFacts */ :
+                    type === falseType ? 3145092 /* FalseFacts */ : 4193668 /* TrueFacts */;
             }
-            if (flags & 131072) {
+            if (flags & 131072 /* Object */) {
                 return isFunctionObjectType(type) ?
-                    strictNullChecks ? 1970144 : 4181984 :
-                    strictNullChecks ? 1972176 : 4184016;
+                    strictNullChecks ? 1970144 /* FunctionStrictFacts */ : 4181984 /* FunctionFacts */ :
+                    strictNullChecks ? 1972176 /* ObjectStrictFacts */ : 4184016 /* ObjectFacts */;
             }
-            if (flags & (4096 | 8192)) {
-                return 2457472;
+            if (flags & (4096 /* Void */ | 8192 /* Undefined */)) {
+                return 2457472 /* UndefinedFacts */;
             }
-            if (flags & 16384) {
-                return 2340752;
+            if (flags & 16384 /* Null */) {
+                return 2340752 /* NullFacts */;
             }
-            if (flags & 3072) {
-                return strictNullChecks ? 1981320 : 4193160;
+            if (flags & 3072 /* ESSymbolLike */) {
+                return strictNullChecks ? 1981320 /* SymbolStrictFacts */ : 4193160 /* SymbolFacts */;
             }
-            if (flags & 16777216) {
-                return strictNullChecks ? 1972176 : 4184016;
+            if (flags & 16777216 /* NonPrimitive */) {
+                return strictNullChecks ? 1972176 /* ObjectStrictFacts */ : 4184016 /* ObjectFacts */;
             }
-            if (flags & 15794176) {
+            if (flags & 15794176 /* Instantiable */) {
                 return getTypeFacts(getBaseConstraintOfType(type) || emptyObjectType);
             }
-            if (flags & 786432) {
+            if (flags & 786432 /* UnionOrIntersection */) {
                 return getTypeFactsOfTypes(type.types);
             }
-            return 4194303;
+            return 4194303 /* All */;
         }
         function getTypeWithFacts(type, include) {
             return filterType(type, function (t) { return (getTypeFacts(t) & include) !== 0; });
@@ -32151,35 +41246,35 @@ var ts;
         function getTypeWithDefault(type, defaultExpression) {
             if (defaultExpression) {
                 var defaultType = getTypeOfExpression(defaultExpression);
-                return getUnionType([getTypeWithFacts(type, 131072), defaultType]);
+                return getUnionType([getTypeWithFacts(type, 131072 /* NEUndefined */), defaultType]);
             }
             return type;
         }
         function getTypeOfDestructuredProperty(type, name) {
             var text = ts.getTextOfPropertyName(name);
             return getConstraintForLocation(getTypeOfPropertyOfType(type, text), name) ||
-                isNumericLiteralName(text) && getIndexTypeOfType(type, 1) ||
-                getIndexTypeOfType(type, 0) ||
+                isNumericLiteralName(text) && getIndexTypeOfType(type, 1 /* Number */) ||
+                getIndexTypeOfType(type, 0 /* String */) ||
                 errorType;
         }
         function getTypeOfDestructuredArrayElement(type, index) {
             return isTupleLikeType(type) && getTypeOfPropertyOfType(type, "" + index) ||
-                checkIteratedTypeOrElementType(type, undefined, false, false) ||
+                checkIteratedTypeOrElementType(type, /*errorNode*/ undefined, /*allowStringInput*/ false, /*allowAsyncIterables*/ false) ||
                 errorType;
         }
         function getTypeOfDestructuredSpreadExpression(type) {
-            return createArrayType(checkIteratedTypeOrElementType(type, undefined, false, false) || errorType);
+            return createArrayType(checkIteratedTypeOrElementType(type, /*errorNode*/ undefined, /*allowStringInput*/ false, /*allowAsyncIterables*/ false) || errorType);
         }
         function getAssignedTypeOfBinaryExpression(node) {
-            var isDestructuringDefaultAssignment = node.parent.kind === 183 && isDestructuringAssignmentTarget(node.parent) ||
-                node.parent.kind === 270 && isDestructuringAssignmentTarget(node.parent.parent);
+            var isDestructuringDefaultAssignment = node.parent.kind === 183 /* ArrayLiteralExpression */ && isDestructuringAssignmentTarget(node.parent) ||
+                node.parent.kind === 270 /* PropertyAssignment */ && isDestructuringAssignmentTarget(node.parent.parent);
             return isDestructuringDefaultAssignment ?
                 getTypeWithDefault(getAssignedType(node), node.right) :
                 getTypeOfExpression(node.right);
         }
         function isDestructuringAssignmentTarget(parent) {
-            return parent.parent.kind === 200 && parent.parent.left === parent ||
-                parent.parent.kind === 222 && parent.parent.initializer === parent;
+            return parent.parent.kind === 200 /* BinaryExpression */ && parent.parent.left === parent ||
+                parent.parent.kind === 222 /* ForOfStatement */ && parent.parent.initializer === parent;
         }
         function getAssignedTypeOfArrayLiteralElement(node, element) {
             return getTypeOfDestructuredArrayElement(getAssignedType(node), node.elements.indexOf(element));
@@ -32196,21 +41291,21 @@ var ts;
         function getAssignedType(node) {
             var parent = node.parent;
             switch (parent.kind) {
-                case 221:
+                case 221 /* ForInStatement */:
                     return stringType;
-                case 222:
+                case 222 /* ForOfStatement */:
                     return checkRightHandSideOfForOf(parent.expression, parent.awaitModifier) || errorType;
-                case 200:
+                case 200 /* BinaryExpression */:
                     return getAssignedTypeOfBinaryExpression(parent);
-                case 194:
+                case 194 /* DeleteExpression */:
                     return undefinedType;
-                case 183:
+                case 183 /* ArrayLiteralExpression */:
                     return getAssignedTypeOfArrayLiteralElement(parent, node);
-                case 204:
+                case 204 /* SpreadElement */:
                     return getAssignedTypeOfSpreadExpression(parent);
-                case 270:
+                case 270 /* PropertyAssignment */:
                     return getAssignedTypeOfPropertyAssignment(parent);
-                case 271:
+                case 271 /* ShorthandPropertyAssignment */:
                     return getAssignedTypeOfShorthandPropertyAssignment(parent);
             }
             return errorType;
@@ -32218,7 +41313,7 @@ var ts;
         function getInitialTypeOfBindingElement(node) {
             var pattern = node.parent;
             var parentType = getInitialType(pattern.parent);
-            var type = pattern.kind === 180 ?
+            var type = pattern.kind === 180 /* ObjectBindingPattern */ ?
                 getTypeOfDestructuredProperty(parentType, node.propertyName || node.name) :
                 !node.dotDotDotToken ?
                     getTypeOfDestructuredArrayElement(parentType, pattern.elements.indexOf(node)) :
@@ -32226,6 +41321,9 @@ var ts;
             return getTypeWithDefault(type, node.initializer);
         }
         function getTypeOfInitializer(node) {
+            // Return the cached type if one is available. If the type of the variable was inferred
+            // from its initializer, we'll already have cached the type. Otherwise we compute it now
+            // without caching such that transient types are reflected.
             var links = getNodeLinks(node);
             return links.resolvedType || getTypeOfExpression(node);
         }
@@ -32233,39 +41331,39 @@ var ts;
             if (node.initializer) {
                 return getTypeOfInitializer(node.initializer);
             }
-            if (node.parent.parent.kind === 221) {
+            if (node.parent.parent.kind === 221 /* ForInStatement */) {
                 return stringType;
             }
-            if (node.parent.parent.kind === 222) {
+            if (node.parent.parent.kind === 222 /* ForOfStatement */) {
                 return checkRightHandSideOfForOf(node.parent.parent.expression, node.parent.parent.awaitModifier) || errorType;
             }
             return errorType;
         }
         function getInitialType(node) {
-            return node.kind === 232 ?
+            return node.kind === 232 /* VariableDeclaration */ ?
                 getInitialTypeOfVariableDeclaration(node) :
                 getInitialTypeOfBindingElement(node);
         }
         function getInitialOrAssignedType(node) {
-            return node.kind === 232 || node.kind === 182 ?
+            return node.kind === 232 /* VariableDeclaration */ || node.kind === 182 /* BindingElement */ ?
                 getInitialType(node) :
                 getAssignedType(node);
         }
         function isEmptyArrayAssignment(node) {
-            return node.kind === 232 && node.initializer &&
+            return node.kind === 232 /* VariableDeclaration */ && node.initializer &&
                 isEmptyArrayLiteral(node.initializer) ||
-                node.kind !== 182 && node.parent.kind === 200 &&
+                node.kind !== 182 /* BindingElement */ && node.parent.kind === 200 /* BinaryExpression */ &&
                     isEmptyArrayLiteral(node.parent.right);
         }
         function getReferenceCandidate(node) {
             switch (node.kind) {
-                case 191:
+                case 191 /* ParenthesizedExpression */:
                     return getReferenceCandidate(node.expression);
-                case 200:
+                case 200 /* BinaryExpression */:
                     switch (node.operatorToken.kind) {
-                        case 58:
+                        case 58 /* EqualsToken */:
                             return getReferenceCandidate(node.left);
-                        case 26:
+                        case 26 /* CommaToken */:
                             return getReferenceCandidate(node.right);
                     }
             }
@@ -32273,13 +41371,13 @@ var ts;
         }
         function getReferenceRoot(node) {
             var parent = node.parent;
-            return parent.kind === 191 ||
-                parent.kind === 200 && parent.operatorToken.kind === 58 && parent.left === node ||
-                parent.kind === 200 && parent.operatorToken.kind === 26 && parent.right === node ?
+            return parent.kind === 191 /* ParenthesizedExpression */ ||
+                parent.kind === 200 /* BinaryExpression */ && parent.operatorToken.kind === 58 /* EqualsToken */ && parent.left === node ||
+                parent.kind === 200 /* BinaryExpression */ && parent.operatorToken.kind === 26 /* CommaToken */ && parent.right === node ?
                 getReferenceRoot(parent) : node;
         }
         function getTypeOfSwitchClause(clause) {
-            if (clause.kind === 266) {
+            if (clause.kind === 266 /* CaseClause */) {
                 return getRegularTypeOfLiteralType(getTypeOfExpression(clause.expression));
             }
             return neverType;
@@ -32296,13 +41394,13 @@ var ts;
             return links.switchTypes;
         }
         function eachTypeContainedIn(source, types) {
-            return source.flags & 262144 ? !ts.forEach(source.types, function (t) { return !ts.contains(types, t); }) : ts.contains(types, source);
+            return source.flags & 262144 /* Union */ ? !ts.forEach(source.types, function (t) { return !ts.contains(types, t); }) : ts.contains(types, source);
         }
         function isTypeSubsetOf(source, target) {
-            return source === target || target.flags & 262144 && isTypeSubsetOfUnion(source, target);
+            return source === target || target.flags & 262144 /* Union */ && isTypeSubsetOfUnion(source, target);
         }
         function isTypeSubsetOfUnion(source, target) {
-            if (source.flags & 262144) {
+            if (source.flags & 262144 /* Union */) {
                 for (var _i = 0, _a = source.types; _i < _a.length; _i++) {
                     var t = _a[_i];
                     if (!containsType(target.types, t)) {
@@ -32311,27 +41409,27 @@ var ts;
                 }
                 return true;
             }
-            if (source.flags & 512 && getBaseTypeOfEnumLiteralType(source) === target) {
+            if (source.flags & 512 /* EnumLiteral */ && getBaseTypeOfEnumLiteralType(source) === target) {
                 return true;
             }
             return containsType(target.types, source);
         }
         function forEachType(type, f) {
-            return type.flags & 262144 ? ts.forEach(type.types, f) : f(type);
+            return type.flags & 262144 /* Union */ ? ts.forEach(type.types, f) : f(type);
         }
         function filterType(type, f) {
-            if (type.flags & 262144) {
+            if (type.flags & 262144 /* Union */) {
                 var types = type.types;
                 var filtered = ts.filter(types, f);
-                return filtered === types ? type : getUnionTypeFromSortedList(filtered, type.flags & 67108864);
+                return filtered === types ? type : getUnionTypeFromSortedList(filtered, type.flags & 67108864 /* UnionOfUnitTypes */);
             }
             return f(type) ? type : neverType;
         }
         function mapType(type, mapper, noReductions) {
-            if (type.flags & 32768) {
+            if (type.flags & 32768 /* Never */) {
                 return type;
             }
-            if (!(type.flags & 262144)) {
+            if (!(type.flags & 262144 /* Union */)) {
                 return mapper(type);
             }
             var types = type.types;
@@ -32352,17 +41450,20 @@ var ts;
                     }
                 }
             }
-            return mappedTypes ? getUnionType(mappedTypes, noReductions ? 0 : 1) : mappedType;
+            return mappedTypes ? getUnionType(mappedTypes, noReductions ? 0 /* None */ : 1 /* Literal */) : mappedType;
         }
         function extractTypesOfKind(type, kind) {
             return filterType(type, function (t) { return (t.flags & kind) !== 0; });
         }
+        // Return a new type in which occurrences of the string and number primitive types in
+        // typeWithPrimitives have been replaced with occurrences of string literals and numeric
+        // literals in typeWithLiterals, respectively.
         function replacePrimitivesWithLiterals(typeWithPrimitives, typeWithLiterals) {
-            if (isTypeSubsetOf(stringType, typeWithPrimitives) && maybeTypeOfKind(typeWithLiterals, 64) ||
-                isTypeSubsetOf(numberType, typeWithPrimitives) && maybeTypeOfKind(typeWithLiterals, 128)) {
+            if (isTypeSubsetOf(stringType, typeWithPrimitives) && maybeTypeOfKind(typeWithLiterals, 64 /* StringLiteral */) ||
+                isTypeSubsetOf(numberType, typeWithPrimitives) && maybeTypeOfKind(typeWithLiterals, 128 /* NumberLiteral */)) {
                 return mapType(typeWithPrimitives, function (t) {
-                    return t.flags & 4 ? extractTypesOfKind(typeWithLiterals, 4 | 64) :
-                        t.flags & 8 ? extractTypesOfKind(typeWithLiterals, 8 | 128) :
+                    return t.flags & 4 /* String */ ? extractTypesOfKind(typeWithLiterals, 4 /* String */ | 64 /* StringLiteral */) :
+                        t.flags & 8 /* Number */ ? extractTypesOfKind(typeWithLiterals, 8 /* Number */ | 128 /* NumberLiteral */) :
                             t;
                 });
             }
@@ -32377,40 +41478,48 @@ var ts;
         function createFlowType(type, incomplete) {
             return incomplete ? { flags: 0, type: type } : type;
         }
+        // An evolving array type tracks the element types that have so far been seen in an
+        // 'x.push(value)' or 'x[n] = value' operation along the control flow graph. Evolving
+        // array types are ultimately converted into manifest array types (using getFinalArrayType)
+        // and never escape the getFlowTypeOfReference function.
         function createEvolvingArrayType(elementType) {
-            var result = createObjectType(256);
+            var result = createObjectType(256 /* EvolvingArray */);
             result.elementType = elementType;
             return result;
         }
         function getEvolvingArrayType(elementType) {
             return evolvingArrayTypes[elementType.id] || (evolvingArrayTypes[elementType.id] = createEvolvingArrayType(elementType));
         }
+        // When adding evolving array element types we do not perform subtype reduction. Instead,
+        // we defer subtype reduction until the evolving array type is finalized into a manifest
+        // array type.
         function addEvolvingArrayElementType(evolvingArrayType, node) {
             var elementType = getBaseTypeOfLiteralType(getContextFreeTypeOfExpression(node));
             return isTypeSubsetOf(elementType, evolvingArrayType.elementType) ? evolvingArrayType : getEvolvingArrayType(getUnionType([evolvingArrayType.elementType, elementType]));
         }
         function createFinalArrayType(elementType) {
-            return elementType.flags & 32768 ?
+            return elementType.flags & 32768 /* Never */ ?
                 autoArrayType :
-                createArrayType(elementType.flags & 262144 ?
-                    getUnionType(elementType.types, 2) :
+                createArrayType(elementType.flags & 262144 /* Union */ ?
+                    getUnionType(elementType.types, 2 /* Subtype */) :
                     elementType);
         }
+        // We perform subtype reduction upon obtaining the final array type from an evolving array type.
         function getFinalArrayType(evolvingArrayType) {
             return evolvingArrayType.finalArrayType || (evolvingArrayType.finalArrayType = createFinalArrayType(evolvingArrayType.elementType));
         }
         function finalizeEvolvingArrayType(type) {
-            return ts.getObjectFlags(type) & 256 ? getFinalArrayType(type) : type;
+            return ts.getObjectFlags(type) & 256 /* EvolvingArray */ ? getFinalArrayType(type) : type;
         }
         function getElementTypeOfEvolvingArrayType(type) {
-            return ts.getObjectFlags(type) & 256 ? type.elementType : neverType;
+            return ts.getObjectFlags(type) & 256 /* EvolvingArray */ ? type.elementType : neverType;
         }
         function isEvolvingArrayTypeList(types) {
             var hasEvolvingArrayType = false;
             for (var _i = 0, types_14 = types; _i < types_14.length; _i++) {
                 var t = types_14[_i];
-                if (!(t.flags & 32768)) {
-                    if (!(ts.getObjectFlags(t) & 256)) {
+                if (!(t.flags & 32768 /* Never */)) {
+                    if (!(ts.getObjectFlags(t) & 256 /* EvolvingArray */)) {
                         return false;
                     }
                     hasEvolvingArrayType = true;
@@ -32418,23 +41527,28 @@ var ts;
             }
             return hasEvolvingArrayType;
         }
+        // At flow control branch or loop junctions, if the type along every antecedent code path
+        // is an evolving array type, we construct a combined evolving array type. Otherwise we
+        // finalize all evolving array types.
         function getUnionOrEvolvingArrayType(types, subtypeReduction) {
             return isEvolvingArrayTypeList(types) ?
                 getEvolvingArrayType(getUnionType(ts.map(types, getElementTypeOfEvolvingArrayType))) :
                 getUnionType(ts.sameMap(types, finalizeEvolvingArrayType), subtypeReduction);
         }
+        // Return true if the given node is 'x' in an 'x.length', x.push(value)', 'x.unshift(value)' or
+        // 'x[n] = value' operation, where 'n' is an expression of type any, undefined, or a number-like type.
         function isEvolvingArrayOperationTarget(node) {
             var root = getReferenceRoot(node);
             var parent = root.parent;
-            var isLengthPushOrUnshift = parent.kind === 185 && (parent.name.escapedText === "length" ||
-                parent.parent.kind === 187 && ts.isPushOrUnshiftIdentifier(parent.name));
-            var isElementAssignment = parent.kind === 186 &&
+            var isLengthPushOrUnshift = parent.kind === 185 /* PropertyAccessExpression */ && (parent.name.escapedText === "length" ||
+                parent.parent.kind === 187 /* CallExpression */ && ts.isPushOrUnshiftIdentifier(parent.name));
+            var isElementAssignment = parent.kind === 186 /* ElementAccessExpression */ &&
                 parent.expression === root &&
-                parent.parent.kind === 200 &&
-                parent.parent.operatorToken.kind === 58 &&
+                parent.parent.kind === 200 /* BinaryExpression */ &&
+                parent.parent.operatorToken.kind === 58 /* EqualsToken */ &&
                 parent.parent.left === parent &&
                 !ts.isAssignmentTarget(parent.parent) &&
-                isTypeAssignableToKind(getTypeOfExpression(parent.argumentExpression), 168);
+                isTypeAssignableToKind(getTypeOfExpression(parent.argumentExpression), 168 /* NumberLike */);
             return isLengthPushOrUnshift || isElementAssignment;
         }
         function maybeTypePredicateCall(node) {
@@ -32445,11 +41559,11 @@ var ts;
             return links.maybeTypePredicate;
         }
         function getMaybeTypePredicate(node) {
-            if (node.expression.kind !== 97) {
+            if (node.expression.kind !== 97 /* SuperKeyword */) {
                 var funcType = checkNonNullExpression(node.expression);
                 if (funcType !== silentNeverType) {
                     var apparentType = getApparentType(funcType);
-                    return apparentType !== errorType && ts.some(getSignaturesOfType(apparentType, 0), signatureHasTypePredicate);
+                    return apparentType !== errorType && ts.some(getSignaturesOfType(apparentType, 0 /* Call */), signatureHasTypePredicate);
                 }
             }
             return false;
@@ -32467,19 +41581,25 @@ var ts;
             if (flowAnalysisDisabled) {
                 return errorType;
             }
-            if (!reference.flowNode || !couldBeUninitialized && !(declaredType.flags & 33492479)) {
+            if (!reference.flowNode || !couldBeUninitialized && !(declaredType.flags & 33492479 /* Narrowable */)) {
                 return declaredType;
             }
             var sharedFlowStart = sharedFlowCount;
             var evolvedType = getTypeFromFlowType(getTypeAtFlowNode(reference.flowNode));
             sharedFlowCount = sharedFlowStart;
-            var resultType = ts.getObjectFlags(evolvedType) & 256 && isEvolvingArrayOperationTarget(reference) ? anyArrayType : finalizeEvolvingArrayType(evolvedType);
-            if (reference.parent && reference.parent.kind === 209 && getTypeWithFacts(resultType, 524288).flags & 32768) {
+            // When the reference is 'x' in an 'x.length', 'x.push(value)', 'x.unshift(value)' or x[n] = value' operation,
+            // we give type 'any[]' to 'x' instead of using the type determined by control flow analysis such that operations
+            // on empty arrays are possible without implicit any errors and new element types can be inferred without
+            // type mismatch errors.
+            var resultType = ts.getObjectFlags(evolvedType) & 256 /* EvolvingArray */ && isEvolvingArrayOperationTarget(reference) ? anyArrayType : finalizeEvolvingArrayType(evolvedType);
+            if (reference.parent && reference.parent.kind === 209 /* NonNullExpression */ && getTypeWithFacts(resultType, 524288 /* NEUndefinedOrNull */).flags & 32768 /* Never */) {
                 return declaredType;
             }
             return resultType;
             function getTypeAtFlowNode(flow) {
                 if (flowDepth === 2500) {
+                    // We have made 2500 recursive invocations. To avoid overflowing the call stack we report an error
+                    // and disable further control flow analysis in the containing function or module body.
                     flowAnalysisDisabled = true;
                     reportFlowControlError(reference);
                     return errorType;
@@ -32487,7 +41607,10 @@ var ts;
                 flowDepth++;
                 while (true) {
                     var flags = flow.flags;
-                    if (flags & 1024) {
+                    if (flags & 1024 /* Shared */) {
+                        // We cache results of flow type resolution for shared nodes that were previously visited in
+                        // the same getFlowTypeOfReference invocation. A node is considered shared when it is the
+                        // antecedent of more than one node.
                         for (var i = sharedFlowStart; i < sharedFlowCount; i++) {
                             if (sharedFlowNodes[i] === flow) {
                                 flowDepth--;
@@ -32496,56 +41619,64 @@ var ts;
                         }
                     }
                     var type = void 0;
-                    if (flags & 4096) {
+                    if (flags & 4096 /* AfterFinally */) {
+                        // block flow edge: finally -> pre-try (for larger explanation check comment in binder.ts - bindTryStatement
                         flow.locked = true;
                         type = getTypeAtFlowNode(flow.antecedent);
                         flow.locked = false;
                     }
-                    else if (flags & 2048) {
+                    else if (flags & 2048 /* PreFinally */) {
+                        // locked pre-finally flows are filtered out in getTypeAtFlowBranchLabel
+                        // so here just redirect to antecedent
                         flow = flow.antecedent;
                         continue;
                     }
-                    else if (flags & 16) {
+                    else if (flags & 16 /* Assignment */) {
                         type = getTypeAtFlowAssignment(flow);
                         if (!type) {
                             flow = flow.antecedent;
                             continue;
                         }
                     }
-                    else if (flags & 96) {
+                    else if (flags & 96 /* Condition */) {
                         type = getTypeAtFlowCondition(flow);
                     }
-                    else if (flags & 128) {
+                    else if (flags & 128 /* SwitchClause */) {
                         type = getTypeAtSwitchClause(flow);
                     }
-                    else if (flags & 12) {
+                    else if (flags & 12 /* Label */) {
                         if (flow.antecedents.length === 1) {
                             flow = flow.antecedents[0];
                             continue;
                         }
-                        type = flags & 4 ?
+                        type = flags & 4 /* BranchLabel */ ?
                             getTypeAtFlowBranchLabel(flow) :
                             getTypeAtFlowLoopLabel(flow);
                     }
-                    else if (flags & 256) {
+                    else if (flags & 256 /* ArrayMutation */) {
                         type = getTypeAtFlowArrayMutation(flow);
                         if (!type) {
                             flow = flow.antecedent;
                             continue;
                         }
                     }
-                    else if (flags & 2) {
+                    else if (flags & 2 /* Start */) {
+                        // Check if we should continue with the control flow of the containing function.
                         var container = flow.container;
-                        if (container && container !== flowContainer && reference.kind !== 185 && reference.kind !== 99) {
+                        if (container && container !== flowContainer && reference.kind !== 185 /* PropertyAccessExpression */ && reference.kind !== 99 /* ThisKeyword */) {
                             flow = container.flowNode;
                             continue;
                         }
+                        // At the top of the flow we have the initial type.
                         type = initialType;
                     }
                     else {
+                        // Unreachable code errors are reported in the binding phase. Here we
+                        // simply return the non-auto declared type to reduce follow-on errors.
                         type = convertAutoToAny(declaredType);
                     }
-                    if (flags & 1024) {
+                    if (flags & 1024 /* Shared */) {
+                        // Record visited node and the associated type in the cache.
                         sharedFlowNodes[sharedFlowCount] = flow;
                         sharedFlowTypes[sharedFlowCount] = type;
                         sharedFlowCount++;
@@ -32556,8 +41687,10 @@ var ts;
             }
             function getTypeAtFlowAssignment(flow) {
                 var node = flow.node;
+                // Assignments only narrow the computed type if the declared type is a union type. Thus, we
+                // only need to evaluate the assigned type if the declared type is a union type.
                 if (isMatchingReference(reference, node)) {
-                    if (ts.getAssignmentTargetKind(node) === 2) {
+                    if (ts.getAssignmentTargetKind(node) === 2 /* Compound */) {
                         var flowType = getTypeAtFlowNode(flow.antecedent);
                         return createFlowType(getBaseTypeOfLiteralType(getTypeFromFlowType(flowType)), isIncomplete(flowType));
                     }
@@ -32568,28 +41701,33 @@ var ts;
                         var assignedType = getBaseTypeOfLiteralType(getInitialOrAssignedType(node));
                         return isTypeAssignableTo(assignedType, declaredType) ? assignedType : anyArrayType;
                     }
-                    if (declaredType.flags & 262144) {
+                    if (declaredType.flags & 262144 /* Union */) {
                         return getAssignmentReducedType(declaredType, getInitialOrAssignedType(node));
                     }
                     return declaredType;
                 }
+                // We didn't have a direct match. However, if the reference is a dotted name, this
+                // may be an assignment to a left hand part of the reference. For example, for a
+                // reference 'x.y.z', we may be at an assignment to 'x.y' or 'x'. In that case,
+                // return the declared type.
                 if (containsMatchingReference(reference, node)) {
                     return declaredType;
                 }
+                // Assignment doesn't affect reference
                 return undefined;
             }
             function getTypeAtFlowArrayMutation(flow) {
                 if (declaredType === autoType || declaredType === autoArrayType) {
                     var node = flow.node;
-                    var expr = node.kind === 187 ?
+                    var expr = node.kind === 187 /* CallExpression */ ?
                         node.expression.expression :
                         node.left.expression;
                     if (isMatchingReference(reference, getReferenceCandidate(expr))) {
                         var flowType = getTypeAtFlowNode(flow.antecedent);
                         var type = getTypeFromFlowType(flowType);
-                        if (ts.getObjectFlags(type) & 256) {
+                        if (ts.getObjectFlags(type) & 256 /* EvolvingArray */) {
                             var evolvedType_1 = type;
-                            if (node.kind === 187) {
+                            if (node.kind === 187 /* CallExpression */) {
                                 for (var _i = 0, _a = node.arguments; _i < _a.length; _i++) {
                                     var arg = _a[_i];
                                     evolvedType_1 = addEvolvingArrayElementType(evolvedType_1, arg);
@@ -32597,7 +41735,7 @@ var ts;
                             }
                             else {
                                 var indexType = getTypeOfExpression(node.left.argumentExpression);
-                                if (isTypeAssignableToKind(indexType, 168)) {
+                                if (isTypeAssignableToKind(indexType, 168 /* NumberLike */)) {
                                     evolvedType_1 = addEvolvingArrayElementType(evolvedType_1, node.right);
                                 }
                             }
@@ -32611,17 +41749,24 @@ var ts;
             function getTypeAtFlowCondition(flow) {
                 var flowType = getTypeAtFlowNode(flow.antecedent);
                 var type = getTypeFromFlowType(flowType);
-                if (type.flags & 32768) {
+                if (type.flags & 32768 /* Never */) {
                     return flowType;
                 }
-                var assumeTrue = (flow.flags & 32) !== 0;
+                // If we have an antecedent type (meaning we're reachable in some way), we first
+                // attempt to narrow the antecedent type. If that produces the never type, and if
+                // the antecedent type is incomplete (i.e. a transient type in a loop), then we
+                // take the type guard as an indication that control *could* reach here once we
+                // have the complete type. We proceed by switching to the silent never type which
+                // doesn't report errors when operators are applied to it. Note that this is the
+                // *only* place a silent never type is ever generated.
+                var assumeTrue = (flow.flags & 32 /* TrueCondition */) !== 0;
                 var nonEvolvingType = finalizeEvolvingArrayType(type);
                 var narrowedType = narrowType(nonEvolvingType, flow.expression, assumeTrue);
                 if (narrowedType === nonEvolvingType) {
                     return flowType;
                 }
                 var incomplete = isIncomplete(flowType);
-                var resultType = incomplete && narrowedType.flags & 32768 ? silentNeverType : narrowedType;
+                var resultType = incomplete && narrowedType.flags & 32768 /* Never */ ? silentNeverType : narrowedType;
                 return createFlowType(resultType, incomplete);
             }
             function getTypeAtSwitchClause(flow) {
@@ -32642,15 +41787,25 @@ var ts;
                 var seenIncomplete = false;
                 for (var _i = 0, _a = flow.antecedents; _i < _a.length; _i++) {
                     var antecedent = _a[_i];
-                    if (antecedent.flags & 2048 && antecedent.lock.locked) {
+                    if (antecedent.flags & 2048 /* PreFinally */ && antecedent.lock.locked) {
+                        // if flow correspond to branch from pre-try to finally and this branch is locked - this means that
+                        // we initially have started following the flow outside the finally block.
+                        // in this case we should ignore this branch.
                         continue;
                     }
                     var flowType = getTypeAtFlowNode(antecedent);
                     var type = getTypeFromFlowType(flowType);
+                    // If the type at a particular antecedent path is the declared type and the
+                    // reference is known to always be assigned (i.e. when declared and initial types
+                    // are the same), there is no reason to process more antecedents since the only
+                    // possible outcome is subtypes that will be removed in the final union type anyway.
                     if (type === declaredType && declaredType === initialType) {
                         return type;
                     }
                     ts.pushIfUnique(antecedentTypes, type);
+                    // If an antecedent type is not a subset of the declared type, we need to perform
+                    // subtype reduction. This happens when a "foreign" type is injected into the control
+                    // flow using the instanceof operator or a user defined type predicate.
                     if (!isTypeSubsetOf(type, declaredType)) {
                         subtypeReduction = true;
                     }
@@ -32658,13 +41813,16 @@ var ts;
                         seenIncomplete = true;
                     }
                 }
-                return createFlowType(getUnionOrEvolvingArrayType(antecedentTypes, subtypeReduction ? 2 : 1), seenIncomplete);
+                return createFlowType(getUnionOrEvolvingArrayType(antecedentTypes, subtypeReduction ? 2 /* Subtype */ : 1 /* Literal */), seenIncomplete);
             }
             function getTypeAtFlowLoopLabel(flow) {
+                // If we have previously computed the control flow type for the reference at
+                // this flow loop junction, return the cached type.
                 var id = getFlowNodeId(flow);
                 var cache = flowLoopCaches[id] || (flowLoopCaches[id] = ts.createMap());
                 if (!key) {
                     key = getFlowCacheKey(reference);
+                    // No cache key is generated when binding patterns are in unnarrowable situations
                     if (!key) {
                         return declaredType;
                     }
@@ -32673,11 +41831,21 @@ var ts;
                 if (cached) {
                     return cached;
                 }
+                // If this flow loop junction and reference are already being processed, return
+                // the union of the types computed for each branch so far, marked as incomplete.
+                // It is possible to see an empty array in cases where loops are nested and the
+                // back edge of the outer loop reaches an inner loop that is already being analyzed.
+                // In such cases we restart the analysis of the inner loop, which will then see
+                // a non-empty in-process array for the outer loop and eventually terminate because
+                // the first antecedent of a loop junction is always the non-looping control flow
+                // path that leads to the top.
                 for (var i = flowLoopStart; i < flowLoopCount; i++) {
                     if (flowLoopNodes[i] === flow && flowLoopKeys[i] === key && flowLoopTypes[i].length) {
-                        return createFlowType(getUnionOrEvolvingArrayType(flowLoopTypes[i], 1), true);
+                        return createFlowType(getUnionOrEvolvingArrayType(flowLoopTypes[i], 1 /* Literal */), /*incomplete*/ true);
                     }
                 }
+                // Add the flow loop junction and reference to the in-process stack and analyze
+                // each antecedent code path.
                 var antecedentTypes = [];
                 var subtypeReduction = false;
                 var firstAntecedentType;
@@ -32693,28 +41861,39 @@ var ts;
                         firstAntecedentType = flowType;
                     }
                     var type = getTypeFromFlowType(flowType);
+                    // If we see a value appear in the cache it is a sign that control flow analysis
+                    // was restarted and completed by checkExpressionCached. We can simply pick up
+                    // the resulting type and bail out.
                     var cached_1 = cache.get(key);
                     if (cached_1) {
                         return cached_1;
                     }
                     ts.pushIfUnique(antecedentTypes, type);
+                    // If an antecedent type is not a subset of the declared type, we need to perform
+                    // subtype reduction. This happens when a "foreign" type is injected into the control
+                    // flow using the instanceof operator or a user defined type predicate.
                     if (!isTypeSubsetOf(type, declaredType)) {
                         subtypeReduction = true;
                     }
+                    // If the type at a particular antecedent path is the declared type there is no
+                    // reason to process more antecedents since the only possible outcome is subtypes
+                    // that will be removed in the final union type anyway.
                     if (type === declaredType) {
                         break;
                     }
                 }
-                var result = getUnionOrEvolvingArrayType(antecedentTypes, subtypeReduction ? 2 : 1);
+                // The result is incomplete if the first antecedent (the non-looping control flow path)
+                // is incomplete.
+                var result = getUnionOrEvolvingArrayType(antecedentTypes, subtypeReduction ? 2 /* Subtype */ : 1 /* Literal */);
                 if (isIncomplete(firstAntecedentType)) {
-                    return createFlowType(result, true);
+                    return createFlowType(result, /*incomplete*/ true);
                 }
                 cache.set(key, result);
                 return result;
             }
             function isMatchingReferenceDiscriminant(expr, computedType) {
-                return expr.kind === 185 &&
-                    computedType.flags & 262144 &&
+                return expr.kind === 185 /* PropertyAccessExpression */ &&
+                    computedType.flags & 262144 /* Union */ &&
                     isMatchingReference(reference, expr.expression) &&
                     isDiscriminantProperty(computedType, expr.name.escapedText);
             }
@@ -32726,10 +41905,10 @@ var ts;
             }
             function narrowTypeByTruthiness(type, expr, assumeTrue) {
                 if (isMatchingReference(reference, expr)) {
-                    return getTypeWithFacts(type, assumeTrue ? 1048576 : 2097152);
+                    return getTypeWithFacts(type, assumeTrue ? 1048576 /* Truthy */ : 2097152 /* Falsy */);
                 }
                 if (isMatchingReferenceDiscriminant(expr, declaredType)) {
-                    return narrowTypeByDiscriminant(type, expr, function (t) { return getTypeWithFacts(t, assumeTrue ? 1048576 : 2097152); });
+                    return narrowTypeByDiscriminant(type, expr, function (t) { return getTypeWithFacts(t, assumeTrue ? 1048576 /* Truthy */ : 2097152 /* Falsy */); });
                 }
                 if (containsMatchingReferenceDiscriminant(reference, expr)) {
                     return declaredType;
@@ -32737,17 +41916,17 @@ var ts;
                 return type;
             }
             function isTypePresencePossible(type, propName, assumeTrue) {
-                if (getIndexInfoOfType(type, 0)) {
+                if (getIndexInfoOfType(type, 0 /* String */)) {
                     return true;
                 }
                 var prop = getPropertyOfType(type, propName);
                 if (prop) {
-                    return prop.flags & 16777216 ? true : assumeTrue;
+                    return prop.flags & 16777216 /* Optional */ ? true : assumeTrue;
                 }
                 return !assumeTrue;
             }
             function narrowByInKeyword(type, literal, assumeTrue) {
-                if ((type.flags & (262144 | 131072)) || (type.flags & 65536 && type.isThisType)) {
+                if ((type.flags & (262144 /* Union */ | 131072 /* Object */)) || (type.flags & 65536 /* TypeParameter */ && type.isThisType)) {
                     var propName_1 = ts.escapeLeadingUnderscores(literal.text);
                     return filterType(type, function (t) { return isTypePresencePossible(t, propName_1, assumeTrue); });
                 }
@@ -32755,19 +41934,19 @@ var ts;
             }
             function narrowTypeByBinaryExpression(type, expr, assumeTrue) {
                 switch (expr.operatorToken.kind) {
-                    case 58:
+                    case 58 /* EqualsToken */:
                         return narrowTypeByTruthiness(type, expr.left, assumeTrue);
-                    case 32:
-                    case 33:
-                    case 34:
-                    case 35:
+                    case 32 /* EqualsEqualsToken */:
+                    case 33 /* ExclamationEqualsToken */:
+                    case 34 /* EqualsEqualsEqualsToken */:
+                    case 35 /* ExclamationEqualsEqualsToken */:
                         var operator_1 = expr.operatorToken.kind;
                         var left_1 = getReferenceCandidate(expr.left);
                         var right_1 = getReferenceCandidate(expr.right);
-                        if (left_1.kind === 195 && ts.isStringLiteralLike(right_1)) {
+                        if (left_1.kind === 195 /* TypeOfExpression */ && ts.isStringLiteralLike(right_1)) {
                             return narrowTypeByTypeof(type, left_1, operator_1, right_1, assumeTrue);
                         }
-                        if (right_1.kind === 195 && ts.isStringLiteralLike(left_1)) {
+                        if (right_1.kind === 195 /* TypeOfExpression */ && ts.isStringLiteralLike(left_1)) {
                             return narrowTypeByTypeof(type, right_1, operator_1, left_1, assumeTrue);
                         }
                         if (isMatchingReference(reference, left_1)) {
@@ -32786,45 +41965,45 @@ var ts;
                             return declaredType;
                         }
                         break;
-                    case 93:
+                    case 93 /* InstanceOfKeyword */:
                         return narrowTypeByInstanceof(type, expr, assumeTrue);
-                    case 92:
+                    case 92 /* InKeyword */:
                         var target = getReferenceCandidate(expr.right);
                         if (ts.isStringLiteralLike(expr.left) && isMatchingReference(reference, target)) {
                             return narrowByInKeyword(type, expr.left, assumeTrue);
                         }
                         break;
-                    case 26:
+                    case 26 /* CommaToken */:
                         return narrowType(type, expr.right, assumeTrue);
                 }
                 return type;
             }
             function narrowTypeByEquality(type, operator, value, assumeTrue) {
-                if (type.flags & 1) {
+                if (type.flags & 1 /* Any */) {
                     return type;
                 }
-                if (operator === 33 || operator === 35) {
+                if (operator === 33 /* ExclamationEqualsToken */ || operator === 35 /* ExclamationEqualsEqualsToken */) {
                     assumeTrue = !assumeTrue;
                 }
                 var valueType = getTypeOfExpression(value);
-                if (valueType.flags & 24576) {
+                if (valueType.flags & 24576 /* Nullable */) {
                     if (!strictNullChecks) {
                         return type;
                     }
-                    var doubleEquals = operator === 32 || operator === 33;
+                    var doubleEquals = operator === 32 /* EqualsEqualsToken */ || operator === 33 /* ExclamationEqualsToken */;
                     var facts = doubleEquals ?
-                        assumeTrue ? 65536 : 524288 :
-                        valueType.flags & 16384 ?
-                            assumeTrue ? 32768 : 262144 :
-                            assumeTrue ? 16384 : 131072;
+                        assumeTrue ? 65536 /* EQUndefinedOrNull */ : 524288 /* NEUndefinedOrNull */ :
+                        valueType.flags & 16384 /* Null */ ?
+                            assumeTrue ? 32768 /* EQNull */ : 262144 /* NENull */ :
+                            assumeTrue ? 16384 /* EQUndefined */ : 131072 /* NEUndefined */;
                     return getTypeWithFacts(type, facts);
                 }
-                if (type.flags & 16909315) {
+                if (type.flags & 16909315 /* NotUnionOrUnit */) {
                     return type;
                 }
                 if (assumeTrue) {
                     var narrowedType = filterType(type, function (t) { return areTypesComparable(t, valueType); });
-                    return narrowedType.flags & 32768 ? type : replacePrimitivesWithLiterals(narrowedType, valueType);
+                    return narrowedType.flags & 32768 /* Never */ ? type : replacePrimitivesWithLiterals(narrowedType, valueType);
                 }
                 if (isUnitType(valueType)) {
                     var regularType_1 = getRegularTypeOfLiteralType(valueType);
@@ -32833,26 +42012,32 @@ var ts;
                 return type;
             }
             function narrowTypeByTypeof(type, typeOfExpr, operator, literal, assumeTrue) {
+                // We have '==', '!=', '====', or !==' operator with 'typeof xxx' and string literal operands
                 var target = getReferenceCandidate(typeOfExpr.expression);
                 if (!isMatchingReference(reference, target)) {
+                    // For a reference of the form 'x.y', a 'typeof x === ...' type guard resets the
+                    // narrowed type of 'y' to its declared type.
                     if (containsMatchingReference(reference, target)) {
                         return declaredType;
                     }
                     return type;
                 }
-                if (operator === 33 || operator === 35) {
+                if (operator === 33 /* ExclamationEqualsToken */ || operator === 35 /* ExclamationEqualsEqualsToken */) {
                     assumeTrue = !assumeTrue;
                 }
-                if (type.flags & 1 && literal.text === "function") {
+                if (type.flags & 1 /* Any */ && literal.text === "function") {
                     return type;
                 }
-                if (assumeTrue && !(type.flags & 262144)) {
+                if (assumeTrue && !(type.flags & 262144 /* Union */)) {
+                    // We narrow a non-union type to an exact primitive type if the non-union type
+                    // is a supertype of that primitive type. For example, type 'any' can be narrowed
+                    // to one of the primitive types.
                     var targetType = literal.text === "function" ? globalFunctionType : typeofTypesByName.get(literal.text);
                     if (targetType) {
                         if (isTypeSubtypeOf(targetType, type)) {
                             return targetType;
                         }
-                        if (type.flags & 15794176) {
+                        if (type.flags & 15794176 /* Instantiable */) {
                             var constraint = getBaseConstraintOfType(type) || anyType;
                             if (isTypeSubtypeOf(targetType, constraint)) {
                                 return getIntersectionType([type, targetType]);
@@ -32861,11 +42046,12 @@ var ts;
                     }
                 }
                 var facts = assumeTrue ?
-                    typeofEQFacts.get(literal.text) || 64 :
-                    typeofNEFacts.get(literal.text) || 8192;
+                    typeofEQFacts.get(literal.text) || 64 /* TypeofEQHostObject */ :
+                    typeofNEFacts.get(literal.text) || 8192 /* TypeofNEHostObject */;
                 return getTypeWithFacts(type, facts);
             }
             function narrowTypeBySwitchOnDiscriminant(type, switchStatement, clauseStart, clauseEnd) {
+                // We only narrow if all case expressions specify values with unit types
                 var switchTypes = getSwitchClauseTypes(switchStatement);
                 if (!switchTypes.length) {
                     return type;
@@ -32873,22 +42059,25 @@ var ts;
                 var clauseTypes = switchTypes.slice(clauseStart, clauseEnd);
                 var hasDefaultClause = clauseStart === clauseEnd || ts.contains(clauseTypes, neverType);
                 var discriminantType = getUnionType(clauseTypes);
-                var caseType = discriminantType.flags & 32768 ? neverType :
+                var caseType = discriminantType.flags & 32768 /* Never */ ? neverType :
                     replacePrimitivesWithLiterals(filterType(type, function (t) { return areTypesComparable(discriminantType, t); }), discriminantType);
                 if (!hasDefaultClause) {
                     return caseType;
                 }
                 var defaultType = filterType(type, function (t) { return !(isUnitType(t) && ts.contains(switchTypes, getRegularTypeOfLiteralType(t))); });
-                return caseType.flags & 32768 ? defaultType : getUnionType([caseType, defaultType]);
+                return caseType.flags & 32768 /* Never */ ? defaultType : getUnionType([caseType, defaultType]);
             }
             function narrowTypeByInstanceof(type, expr, assumeTrue) {
                 var left = getReferenceCandidate(expr.left);
                 if (!isMatchingReference(reference, left)) {
+                    // For a reference of the form 'x.y', an 'x instanceof T' type guard resets the
+                    // narrowed type of 'y' to its declared type.
                     if (containsMatchingReference(reference, left)) {
                         return declaredType;
                     }
                     return type;
                 }
+                // Check that right operand is a function type with a prototype property
                 var rightType = getTypeOfExpression(expr.right);
                 if (!isTypeSubtypeOf(rightType, globalFunctionType)) {
                     return type;
@@ -32896,21 +42085,24 @@ var ts;
                 var targetType;
                 var prototypeProperty = getPropertyOfType(rightType, "prototype");
                 if (prototypeProperty) {
+                    // Target type is type of the prototype property
                     var prototypePropertyType = getTypeOfSymbol(prototypeProperty);
                     if (!isTypeAny(prototypePropertyType)) {
                         targetType = prototypePropertyType;
                     }
                 }
+                // Don't narrow from 'any' if the target type is exactly 'Object' or 'Function'
                 if (isTypeAny(type) && (targetType === globalObjectType || targetType === globalFunctionType)) {
                     return type;
                 }
                 if (!targetType) {
+                    // Target type is type of construct signature
                     var constructSignatures = void 0;
-                    if (ts.getObjectFlags(rightType) & 2) {
+                    if (ts.getObjectFlags(rightType) & 2 /* Interface */) {
                         constructSignatures = resolveDeclaredMembers(rightType).declaredConstructSignatures;
                     }
-                    else if (ts.getObjectFlags(rightType) & 16) {
-                        constructSignatures = getSignaturesOfType(rightType, 1);
+                    else if (ts.getObjectFlags(rightType) & 16 /* Anonymous */) {
+                        constructSignatures = getSignaturesOfType(rightType, 1 /* Construct */);
                     }
                     if (constructSignatures && constructSignatures.length) {
                         targetType = getUnionType(ts.map(constructSignatures, function (signature) { return getReturnTypeOfSignature(getErasedSignature(signature)); }));
@@ -32925,12 +42117,19 @@ var ts;
                 if (!assumeTrue) {
                     return filterType(type, function (t) { return !isRelated(t, candidate); });
                 }
-                if (type.flags & 262144) {
+                // If the current type is a union type, remove all constituents that couldn't be instances of
+                // the candidate type. If one or more constituents remain, return a union of those.
+                if (type.flags & 262144 /* Union */) {
                     var assignableType = filterType(type, function (t) { return isRelated(t, candidate); });
-                    if (!(assignableType.flags & 32768)) {
+                    if (!(assignableType.flags & 32768 /* Never */)) {
                         return assignableType;
                     }
                 }
+                // If the candidate type is a subtype of the target type, narrow to the candidate type.
+                // Otherwise, if the target type is assignable to the candidate type, keep the target type.
+                // Otherwise, if the candidate type is assignable to the target type, narrow to the candidate
+                // type. Otherwise, the types are completely unrelated, so narrow to an intersection of the
+                // two types.
                 return isTypeSubtypeOf(candidate, type) ? candidate :
                     isTypeAssignableTo(type, candidate) ? type :
                         isTypeAssignableTo(candidate, type) ? candidate :
@@ -32945,6 +42144,7 @@ var ts;
                 if (!predicate) {
                     return type;
                 }
+                // Don't narrow from 'any' if the predicate type is exactly 'Object' or 'Function'
                 if (isTypeAny(type) && (predicate.type === globalObjectType || predicate.type === globalFunctionType)) {
                     return type;
                 }
@@ -32961,7 +42161,7 @@ var ts;
                 }
                 else {
                     var invokedExpression = ts.skipParentheses(callExpression.expression);
-                    if (invokedExpression.kind === 186 || invokedExpression.kind === 185) {
+                    if (invokedExpression.kind === 186 /* ElementAccessExpression */ || invokedExpression.kind === 185 /* PropertyAccessExpression */) {
                         var accessExpression = invokedExpression;
                         var possibleReference = ts.skipParentheses(accessExpression.expression);
                         if (isMatchingReference(reference, possibleReference)) {
@@ -32974,21 +42174,23 @@ var ts;
                 }
                 return type;
             }
+            // Narrow the given type based on the given expression having the assumed boolean value. The returned type
+            // will be a subtype or the same type as the argument.
             function narrowType(type, expr, assumeTrue) {
                 switch (expr.kind) {
-                    case 71:
-                    case 99:
-                    case 97:
-                    case 185:
+                    case 71 /* Identifier */:
+                    case 99 /* ThisKeyword */:
+                    case 97 /* SuperKeyword */:
+                    case 185 /* PropertyAccessExpression */:
                         return narrowTypeByTruthiness(type, expr, assumeTrue);
-                    case 187:
+                    case 187 /* CallExpression */:
                         return narrowTypeByTypePredicate(type, expr, assumeTrue);
-                    case 191:
+                    case 191 /* ParenthesizedExpression */:
                         return narrowType(type, expr.expression, assumeTrue);
-                    case 200:
+                    case 200 /* BinaryExpression */:
                         return narrowTypeByBinaryExpression(type, expr, assumeTrue);
-                    case 198:
-                        if (expr.operator === 51) {
+                    case 198 /* PrefixUnaryExpression */:
+                        if (expr.operator === 51 /* ExclamationToken */) {
                             return narrowType(type, expr.operand, !assumeTrue);
                         }
                         break;
@@ -32998,7 +42200,11 @@ var ts;
         }
         function getTypeOfSymbolAtLocation(symbol, location) {
             symbol = symbol.exportSymbol || symbol;
-            if (location.kind === 71) {
+            // If we have an identifier or a property access at the given location, if the location is
+            // an dotted name expression, and if the location is not an assignment target, obtain the type
+            // of the expression (which will reflect control flow analysis). If the expression indeed
+            // resolved to the given symbol, return the narrowed type.
+            if (location.kind === 71 /* Identifier */) {
                 if (ts.isRightSideOfQualifiedNameOrPropertyAccess(location)) {
                     location = location.parent;
                 }
@@ -33009,21 +42215,27 @@ var ts;
                     }
                 }
             }
+            // The location isn't a reference to the given symbol, meaning we're being asked
+            // a hypothetical question of what type the symbol would have if there was a reference
+            // to it at the given location. Since we have no control flow information for the
+            // hypothetical reference (control flow information is created and attached by the
+            // binder), we simply return the declared type of the symbol.
             return getTypeOfSymbol(symbol);
         }
         function getControlFlowContainer(node) {
             return ts.findAncestor(node.parent, function (node) {
                 return ts.isFunctionLike(node) && !ts.getImmediatelyInvokedFunctionExpression(node) ||
-                    node.kind === 240 ||
-                    node.kind === 274 ||
-                    node.kind === 152;
+                    node.kind === 240 /* ModuleBlock */ ||
+                    node.kind === 274 /* SourceFile */ ||
+                    node.kind === 152 /* PropertyDeclaration */;
             });
         }
+        // Check if a parameter is assigned anywhere within its declaring function.
         function isParameterAssigned(symbol) {
             var func = ts.getRootDeclaration(symbol.valueDeclaration).parent;
             var links = getNodeLinks(func);
-            if (!(links.flags & 4194304)) {
-                links.flags |= 4194304;
+            if (!(links.flags & 4194304 /* AssignmentsMarked */)) {
+                links.flags |= 4194304 /* AssignmentsMarked */;
                 if (!hasParentWithAssignmentsMarked(func)) {
                     markParameterAssignments(func);
                 }
@@ -33031,13 +42243,13 @@ var ts;
             return symbol.isAssigned || false;
         }
         function hasParentWithAssignmentsMarked(node) {
-            return !!ts.findAncestor(node.parent, function (node) { return ts.isFunctionLike(node) && !!(getNodeLinks(node).flags & 4194304); });
+            return !!ts.findAncestor(node.parent, function (node) { return ts.isFunctionLike(node) && !!(getNodeLinks(node).flags & 4194304 /* AssignmentsMarked */); });
         }
         function markParameterAssignments(node) {
-            if (node.kind === 71) {
+            if (node.kind === 71 /* Identifier */) {
                 if (ts.isAssignmentTarget(node)) {
                     var symbol = getResolvedSymbol(node);
-                    if (symbol.valueDeclaration && ts.getRootDeclaration(symbol.valueDeclaration).kind === 149) {
+                    if (symbol.valueDeclaration && ts.getRootDeclaration(symbol.valueDeclaration).kind === 149 /* Parameter */) {
                         symbol.isAssigned = true;
                     }
                 }
@@ -33047,34 +42259,39 @@ var ts;
             }
         }
         function isConstVariable(symbol) {
-            return symbol.flags & 3 && (getDeclarationNodeFlagsFromSymbol(symbol) & 2) !== 0 && getTypeOfSymbol(symbol) !== autoArrayType;
+            return symbol.flags & 3 /* Variable */ && (getDeclarationNodeFlagsFromSymbol(symbol) & 2 /* Const */) !== 0 && getTypeOfSymbol(symbol) !== autoArrayType;
         }
+        /** remove undefined from the annotated type of a parameter when there is an initializer (that doesn't include undefined) */
         function removeOptionalityFromDeclaredType(declaredType, declaration) {
             var annotationIncludesUndefined = strictNullChecks &&
-                declaration.kind === 149 &&
+                declaration.kind === 149 /* Parameter */ &&
                 declaration.initializer &&
-                getFalsyFlags(declaredType) & 8192 &&
-                !(getFalsyFlags(checkExpression(declaration.initializer)) & 8192);
-            return annotationIncludesUndefined ? getTypeWithFacts(declaredType, 131072) : declaredType;
+                getFalsyFlags(declaredType) & 8192 /* Undefined */ &&
+                !(getFalsyFlags(checkExpression(declaration.initializer)) & 8192 /* Undefined */);
+            return annotationIncludesUndefined ? getTypeWithFacts(declaredType, 131072 /* NEUndefined */) : declaredType;
         }
         function isConstraintPosition(node) {
             var parent = node.parent;
-            return parent.kind === 185 ||
-                parent.kind === 187 && parent.expression === node ||
-                parent.kind === 186 && parent.expression === node ||
-                parent.kind === 182 && parent.name === node && !!parent.initializer;
+            return parent.kind === 185 /* PropertyAccessExpression */ ||
+                parent.kind === 187 /* CallExpression */ && parent.expression === node ||
+                parent.kind === 186 /* ElementAccessExpression */ && parent.expression === node ||
+                parent.kind === 182 /* BindingElement */ && parent.name === node && !!parent.initializer;
         }
         function typeHasNullableConstraint(type) {
-            return type.flags & 14745600 && maybeTypeOfKind(getBaseConstraintOfType(type) || emptyObjectType, 24576);
+            return type.flags & 14745600 /* InstantiableNonPrimitive */ && maybeTypeOfKind(getBaseConstraintOfType(type) || emptyObjectType, 24576 /* Nullable */);
         }
         function getConstraintForLocation(type, node) {
+            // When a node is the left hand expression of a property access, element access, or call expression,
+            // and the type of the node includes type variables with constraints that are nullable, we fetch the
+            // apparent type of the node *before* performing control flow analysis such that narrowings apply to
+            // the constraint type.
             if (type && isConstraintPosition(node) && forEachType(type, typeHasNullableConstraint)) {
                 return mapType(getWidenedType(type), getBaseConstraintOrType);
             }
             return type;
         }
         function markAliasReferenced(symbol, location) {
-            if (isNonLocalAlias(symbol, 67216319) && !isInTypeQuery(location) && !isConstEnumOrConstEnumOnlyModule(resolveAlias(symbol))) {
+            if (isNonLocalAlias(symbol, /*excludes*/ 67216319 /* Value */) && !isInTypeQuery(location) && !isConstEnumOrConstEnumOnlyModule(resolveAlias(symbol))) {
                 markAliasSymbolAsReferenced(symbol);
             }
         }
@@ -33083,48 +42300,62 @@ var ts;
             if (symbol === unknownSymbol) {
                 return errorType;
             }
+            // As noted in ECMAScript 6 language spec, arrow functions never have an arguments objects.
+            // Although in down-level emit of arrow function, we emit it using function expression which means that
+            // arguments objects will be bound to the inner object; emitting arrow function natively in ES6, arguments objects
+            // will be bound to non-arrow function that contain this arrow function. This results in inconsistent behavior.
+            // To avoid that we will give an error to users if they use arguments objects in arrow function so that they
+            // can explicitly bound arguments objects
             if (symbol === argumentsSymbol) {
                 var container = ts.getContainingFunction(node);
-                if (languageVersion < 2) {
-                    if (container.kind === 193) {
+                if (languageVersion < 2 /* ES2015 */) {
+                    if (container.kind === 193 /* ArrowFunction */) {
                         error(node, ts.Diagnostics.The_arguments_object_cannot_be_referenced_in_an_arrow_function_in_ES3_and_ES5_Consider_using_a_standard_function_expression);
                     }
-                    else if (ts.hasModifier(container, 256)) {
+                    else if (ts.hasModifier(container, 256 /* Async */)) {
                         error(node, ts.Diagnostics.The_arguments_object_cannot_be_referenced_in_an_async_function_or_method_in_ES3_and_ES5_Consider_using_a_standard_function_or_method);
                     }
                 }
-                getNodeLinks(container).flags |= 8192;
+                getNodeLinks(container).flags |= 8192 /* CaptureArguments */;
                 return getTypeOfSymbol(symbol);
             }
+            // We should only mark aliases as referenced if there isn't a local value declaration
+            // for the symbol. Also, don't mark any property access expression LHS - checkPropertyAccessExpression will handle that
             if (!(node.parent && ts.isPropertyAccessExpression(node.parent) && node.parent.expression === node)) {
                 markAliasReferenced(symbol, node);
             }
             var localOrExportSymbol = getExportSymbolOfValueSymbolIfExported(symbol);
             var declaration = localOrExportSymbol.valueDeclaration;
-            if (localOrExportSymbol.flags & 32) {
-                if (declaration.kind === 235
+            if (localOrExportSymbol.flags & 32 /* Class */) {
+                // Due to the emit for class decorators, any reference to the class from inside of the class body
+                // must instead be rewritten to point to a temporary variable to avoid issues with the double-bind
+                // behavior of class names in ES6.
+                if (declaration.kind === 235 /* ClassDeclaration */
                     && ts.nodeIsDecorated(declaration)) {
                     var container = ts.getContainingClass(node);
                     while (container !== undefined) {
                         if (container === declaration && container.name !== node) {
-                            getNodeLinks(declaration).flags |= 8388608;
-                            getNodeLinks(node).flags |= 16777216;
+                            getNodeLinks(declaration).flags |= 8388608 /* ClassWithConstructorReference */;
+                            getNodeLinks(node).flags |= 16777216 /* ConstructorReferenceInClass */;
                             break;
                         }
                         container = ts.getContainingClass(container);
                     }
                 }
-                else if (declaration.kind === 205) {
-                    var container = ts.getThisContainer(node, false);
-                    while (container.kind !== 274) {
+                else if (declaration.kind === 205 /* ClassExpression */) {
+                    // When we emit a class expression with static members that contain a reference
+                    // to the constructor in the initializer, we will need to substitute that
+                    // binding with an alias as the class name is not in scope.
+                    var container = ts.getThisContainer(node, /*includeArrowFunctions*/ false);
+                    while (container.kind !== 274 /* SourceFile */) {
                         if (container.parent === declaration) {
-                            if (container.kind === 152 && ts.hasModifier(container, 32)) {
-                                getNodeLinks(declaration).flags |= 8388608;
-                                getNodeLinks(node).flags |= 16777216;
+                            if (container.kind === 152 /* PropertyDeclaration */ && ts.hasModifier(container, 32 /* Static */)) {
+                                getNodeLinks(declaration).flags |= 8388608 /* ClassWithConstructorReference */;
+                                getNodeLinks(node).flags |= 16777216 /* ConstructorReferenceInClass */;
                             }
                             break;
                         }
-                        container = ts.getThisContainer(container, false);
+                        container = ts.getThisContainer(container, /*includeArrowFunctions*/ false);
                     }
                 }
             }
@@ -33132,8 +42363,8 @@ var ts;
             var type = getConstraintForLocation(getTypeOfSymbol(localOrExportSymbol), node);
             var assignmentKind = ts.getAssignmentTargetKind(node);
             if (assignmentKind) {
-                if (!(localOrExportSymbol.flags & 3) &&
-                    !(ts.isInJavaScriptFile(node) && localOrExportSymbol.flags & 512)) {
+                if (!(localOrExportSymbol.flags & 3 /* Variable */) &&
+                    !(ts.isInJavaScriptFile(node) && localOrExportSymbol.flags & 512 /* ValueModule */)) {
                     error(node, ts.Diagnostics.Cannot_assign_to_0_because_it_is_not_a_variable, symbolToString(symbol));
                     return errorType;
                 }
@@ -33142,9 +42373,11 @@ var ts;
                     return errorType;
                 }
             }
-            var isAlias = localOrExportSymbol.flags & 2097152;
-            if (localOrExportSymbol.flags & 3) {
-                if (assignmentKind === 1) {
+            var isAlias = localOrExportSymbol.flags & 2097152 /* Alias */;
+            // We only narrow variables and parameters occurring in a non-assignment position. For all other
+            // entities we simply return the declared type.
+            if (localOrExportSymbol.flags & 3 /* Variable */) {
+                if (assignmentKind === 1 /* Definite */) {
                     return type;
                 }
             }
@@ -33157,26 +42390,38 @@ var ts;
             if (!declaration) {
                 return type;
             }
-            var isParameter = ts.getRootDeclaration(declaration).kind === 149;
+            // The declaration container is the innermost function that encloses the declaration of the variable
+            // or parameter. The flow container is the innermost function starting with which we analyze the control
+            // flow graph to determine the control flow based type.
+            var isParameter = ts.getRootDeclaration(declaration).kind === 149 /* Parameter */;
             var declarationContainer = getControlFlowContainer(declaration);
             var flowContainer = getControlFlowContainer(node);
             var isOuterVariable = flowContainer !== declarationContainer;
             var isSpreadDestructuringAsignmentTarget = node.parent && node.parent.parent && ts.isSpreadAssignment(node.parent) && isDestructuringAssignmentTarget(node.parent.parent);
-            while (flowContainer !== declarationContainer && (flowContainer.kind === 192 ||
-                flowContainer.kind === 193 || ts.isObjectLiteralOrClassExpressionMethod(flowContainer)) &&
+            // When the control flow originates in a function expression or arrow function and we are referencing
+            // a const variable or parameter from an outer function, we extend the origin of the control flow
+            // analysis to include the immediately enclosing function.
+            while (flowContainer !== declarationContainer && (flowContainer.kind === 192 /* FunctionExpression */ ||
+                flowContainer.kind === 193 /* ArrowFunction */ || ts.isObjectLiteralOrClassExpressionMethod(flowContainer)) &&
                 (isConstVariable(localOrExportSymbol) || isParameter && !isParameterAssigned(localOrExportSymbol))) {
                 flowContainer = getControlFlowContainer(flowContainer);
             }
+            // We only look for uninitialized variables in strict null checking mode, and only when we can analyze
+            // the entire control flow graph from the variable's declaration (i.e. when the flow container and
+            // declaration container are the same).
             var assumeInitialized = isParameter || isAlias || isOuterVariable || isSpreadDestructuringAsignmentTarget ||
-                type !== autoType && type !== autoArrayType && (!strictNullChecks || (type.flags & 3) !== 0 ||
-                    isInTypeQuery(node) || node.parent.kind === 252) ||
-                node.parent.kind === 209 ||
-                declaration.kind === 232 && declaration.exclamationToken ||
-                declaration.flags & 4194304;
+                type !== autoType && type !== autoArrayType && (!strictNullChecks || (type.flags & 3 /* AnyOrUnknown */) !== 0 ||
+                    isInTypeQuery(node) || node.parent.kind === 252 /* ExportSpecifier */) ||
+                node.parent.kind === 209 /* NonNullExpression */ ||
+                declaration.kind === 232 /* VariableDeclaration */ && declaration.exclamationToken ||
+                declaration.flags & 4194304 /* Ambient */;
             var initialType = assumeInitialized ? (isParameter ? removeOptionalityFromDeclaredType(type, declaration) : type) :
                 type === autoType || type === autoArrayType ? undefinedType :
                     getOptionalType(type);
             var flowType = getFlowTypeOfReference(node, type, initialType, flowContainer, !assumeInitialized);
+            // A variable is considered uninitialized when it is possible to analyze the entire control flow graph
+            // from declaration to use, and when the variable's declared type doesn't include undefined but the
+            // control flow based type does include undefined.
             if (type === autoType || type === autoArrayType) {
                 if (flowType === autoType || flowType === autoArrayType) {
                     if (noImplicitAny) {
@@ -33186,8 +42431,9 @@ var ts;
                     return convertAutoToAny(flowType);
                 }
             }
-            else if (!assumeInitialized && !(getFalsyFlags(type) & 8192) && getFalsyFlags(flowType) & 8192) {
+            else if (!assumeInitialized && !(getFalsyFlags(type) & 8192 /* Undefined */) && getFalsyFlags(flowType) & 8192 /* Undefined */) {
                 error(node, ts.Diagnostics.Variable_0_is_used_before_being_assigned, symbolToString(symbol));
+                // Return the declared type to reduce follow-on errors
                 return type;
             }
             return assignmentKind ? getBaseTypeOfLiteralType(flowType) : flowType;
@@ -33196,17 +42442,21 @@ var ts;
             return !!ts.findAncestor(node, function (n) { return n === threshold ? "quit" : ts.isFunctionLike(n); });
         }
         function checkNestedBlockScopedBinding(node, symbol) {
-            if (languageVersion >= 2 ||
-                (symbol.flags & (2 | 32)) === 0 ||
-                symbol.valueDeclaration.parent.kind === 269) {
+            if (languageVersion >= 2 /* ES2015 */ ||
+                (symbol.flags & (2 /* BlockScopedVariable */ | 32 /* Class */)) === 0 ||
+                symbol.valueDeclaration.parent.kind === 269 /* CatchClause */) {
                 return;
             }
+            // 1. walk from the use site up to the declaration and check
+            // if there is anything function like between declaration and use-site (is binding/class is captured in function).
+            // 2. walk from the declaration up to the boundary of lexical environment and check
+            // if there is an iteration statement in between declaration and boundary (is binding/class declared inside iteration statement)
             var container = ts.getEnclosingBlockScopeContainer(symbol.valueDeclaration);
             var usedInFunction = isInsideFunction(node.parent, container);
             var current = container;
             var containedInIterationStatement = false;
             while (current && !ts.nodeStartsNewLexicalEnvironment(current)) {
-                if (ts.isIterationStatement(current, false)) {
+                if (ts.isIterationStatement(current, /*lookInLabeledStatements*/ false)) {
                     containedInIterationStatement = true;
                     break;
                 }
@@ -33214,45 +42464,53 @@ var ts;
             }
             if (containedInIterationStatement) {
                 if (usedInFunction) {
-                    getNodeLinks(current).flags |= 65536;
+                    // mark iteration statement as containing block-scoped binding captured in some function
+                    getNodeLinks(current).flags |= 65536 /* LoopWithCapturedBlockScopedBinding */;
                 }
-                if (container.kind === 220 &&
-                    ts.getAncestor(symbol.valueDeclaration, 233).parent === container &&
+                // mark variables that are declared in loop initializer and reassigned inside the body of ForStatement.
+                // if body of ForStatement will be converted to function then we'll need a extra machinery to propagate reassigned values back.
+                if (container.kind === 220 /* ForStatement */ &&
+                    ts.getAncestor(symbol.valueDeclaration, 233 /* VariableDeclarationList */).parent === container &&
                     isAssignedInBodyOfForStatement(node, container)) {
-                    getNodeLinks(symbol.valueDeclaration).flags |= 2097152;
+                    getNodeLinks(symbol.valueDeclaration).flags |= 2097152 /* NeedsLoopOutParameter */;
                 }
-                getNodeLinks(symbol.valueDeclaration).flags |= 262144;
+                // set 'declared inside loop' bit on the block-scoped binding
+                getNodeLinks(symbol.valueDeclaration).flags |= 262144 /* BlockScopedBindingInLoop */;
             }
             if (usedInFunction) {
-                getNodeLinks(symbol.valueDeclaration).flags |= 131072;
+                getNodeLinks(symbol.valueDeclaration).flags |= 131072 /* CapturedBlockScopedBinding */;
             }
         }
         function isAssignedInBodyOfForStatement(node, container) {
+            // skip parenthesized nodes
             var current = node;
-            while (current.parent.kind === 191) {
+            while (current.parent.kind === 191 /* ParenthesizedExpression */) {
                 current = current.parent;
             }
+            // check if node is used as LHS in some assignment expression
             var isAssigned = false;
             if (ts.isAssignmentTarget(current)) {
                 isAssigned = true;
             }
-            else if ((current.parent.kind === 198 || current.parent.kind === 199)) {
+            else if ((current.parent.kind === 198 /* PrefixUnaryExpression */ || current.parent.kind === 199 /* PostfixUnaryExpression */)) {
                 var expr = current.parent;
-                isAssigned = expr.operator === 43 || expr.operator === 44;
+                isAssigned = expr.operator === 43 /* PlusPlusToken */ || expr.operator === 44 /* MinusMinusToken */;
             }
             if (!isAssigned) {
                 return false;
             }
+            // at this point we know that node is the target of assignment
+            // now check that modification happens inside the statement part of the ForStatement
             return !!ts.findAncestor(current, function (n) { return n === container ? "quit" : n === container.statement; });
         }
         function captureLexicalThis(node, container) {
-            getNodeLinks(node).flags |= 2;
-            if (container.kind === 152 || container.kind === 155) {
+            getNodeLinks(node).flags |= 2 /* LexicalThis */;
+            if (container.kind === 152 /* PropertyDeclaration */ || container.kind === 155 /* Constructor */) {
                 var classNode = container.parent;
-                getNodeLinks(classNode).flags |= 4;
+                getNodeLinks(classNode).flags |= 4 /* CaptureThis */;
             }
             else {
-                getNodeLinks(container).flags |= 4;
+                getNodeLinks(container).flags |= 4 /* CaptureThis */;
             }
         }
         function findFirstSuperCall(n) {
@@ -33264,14 +42522,26 @@ var ts;
             }
             return ts.forEachChild(n, findFirstSuperCall);
         }
+        /**
+         * Return a cached result if super-statement is already found.
+         * Otherwise, find a super statement in a given constructor function and cache the result in the node-links of the constructor
+         *
+         * @param constructor constructor-function to look for super statement
+         */
         function getSuperCallInConstructor(constructor) {
             var links = getNodeLinks(constructor);
+            // Only trying to find super-call if we haven't yet tried to find one.  Once we try, we will record the result
             if (links.hasSuperCall === undefined) {
                 links.superCall = findFirstSuperCall(constructor.body);
                 links.hasSuperCall = links.superCall ? true : false;
             }
             return links.superCall;
         }
+        /**
+         * Check if the given class-declaration extends null then return true.
+         * Otherwise, return false
+         * @param classDecl a class declaration to check if it extends null
+         */
         function classDeclarationExtendsNull(classDecl) {
             var classSymbol = getSymbolOfNode(classDecl);
             var classInstanceType = getDeclaredTypeOfSymbol(classSymbol);
@@ -33281,42 +42551,60 @@ var ts;
         function checkThisBeforeSuper(node, container, diagnosticMessage) {
             var containingClassDecl = container.parent;
             var baseTypeNode = ts.getClassExtendsHeritageClauseElement(containingClassDecl);
+            // If a containing class does not have extends clause or the class extends null
+            // skip checking whether super statement is called before "this" accessing.
             if (baseTypeNode && !classDeclarationExtendsNull(containingClassDecl)) {
                 var superCall = getSuperCallInConstructor(container);
+                // We should give an error in the following cases:
+                //      - No super-call
+                //      - "this" is accessing before super-call.
+                //          i.e super(this)
+                //              this.x; super();
+                // We want to make sure that super-call is done before accessing "this" so that
+                // "this" is not accessed as a parameter of the super-call.
                 if (!superCall || superCall.end > node.pos) {
+                    // In ES6, super inside constructor of class-declaration has to precede "this" accessing
                     error(node, diagnosticMessage);
                 }
             }
         }
         function checkThisExpression(node) {
-            var container = ts.getThisContainer(node, true);
+            // Stop at the first arrow function so that we can
+            // tell whether 'this' needs to be captured.
+            var container = ts.getThisContainer(node, /* includeArrowFunctions */ true);
             var needToCaptureLexicalThis = false;
-            if (container.kind === 155) {
+            if (container.kind === 155 /* Constructor */) {
                 checkThisBeforeSuper(node, container, ts.Diagnostics.super_must_be_called_before_accessing_this_in_the_constructor_of_a_derived_class);
             }
-            if (container.kind === 193) {
-                container = ts.getThisContainer(container, false);
-                needToCaptureLexicalThis = (languageVersion < 2);
+            // Now skip arrow functions to get the "real" owner of 'this'.
+            if (container.kind === 193 /* ArrowFunction */) {
+                container = ts.getThisContainer(container, /* includeArrowFunctions */ false);
+                // When targeting es6, arrow function lexically bind "this" so we do not need to do the work of binding "this" in emitted code
+                needToCaptureLexicalThis = (languageVersion < 2 /* ES2015 */);
             }
             switch (container.kind) {
-                case 239:
+                case 239 /* ModuleDeclaration */:
                     error(node, ts.Diagnostics.this_cannot_be_referenced_in_a_module_or_namespace_body);
+                    // do not return here so in case if lexical this is captured - it will be reflected in flags on NodeLinks
                     break;
-                case 238:
+                case 238 /* EnumDeclaration */:
                     error(node, ts.Diagnostics.this_cannot_be_referenced_in_current_location);
+                    // do not return here so in case if lexical this is captured - it will be reflected in flags on NodeLinks
                     break;
-                case 155:
+                case 155 /* Constructor */:
                     if (isInConstructorArgumentInitializer(node, container)) {
                         error(node, ts.Diagnostics.this_cannot_be_referenced_in_constructor_arguments);
+                        // do not return here so in case if lexical this is captured - it will be reflected in flags on NodeLinks
                     }
                     break;
-                case 152:
-                case 151:
-                    if (ts.hasModifier(container, 32)) {
+                case 152 /* PropertyDeclaration */:
+                case 151 /* PropertySignature */:
+                    if (ts.hasModifier(container, 32 /* Static */)) {
                         error(node, ts.Diagnostics.this_cannot_be_referenced_in_a_static_property_initializer);
+                        // do not return here so in case if lexical this is captured - it will be reflected in flags on NodeLinks
                     }
                     break;
-                case 147:
+                case 147 /* ComputedPropertyName */:
                     error(node, ts.Diagnostics.this_cannot_be_referenced_in_a_computed_property_name);
                     break;
             }
@@ -33325,23 +42613,28 @@ var ts;
             }
             var type = tryGetThisTypeAt(node, container);
             if (!type && noImplicitThis) {
+                // With noImplicitThis, functions may not reference 'this' if it has type 'any'
                 error(node, ts.Diagnostics.this_implicitly_has_type_any_because_it_does_not_have_a_type_annotation);
             }
             return type || anyType;
         }
         function tryGetThisTypeAt(node, container) {
-            if (container === void 0) { container = ts.getThisContainer(node, false); }
+            if (container === void 0) { container = ts.getThisContainer(node, /*includeArrowFunctions*/ false); }
             if (ts.isFunctionLike(container) &&
                 (!isInParameterInitializerBeforeContainingFunction(node) || ts.getThisParameter(container))) {
-                if (container.kind === 192 &&
-                    container.parent.kind === 200 &&
-                    ts.getSpecialPropertyAssignmentKind(container.parent) === 3) {
-                    var className = container.parent
-                        .left
-                        .expression
-                        .expression;
+                // Note: a parameter initializer should refer to class-this unless function-this is explicitly annotated.
+                // If this is a function in a JS file, it might be a class method. Check if it's the RHS
+                // of a x.prototype.y = function [name]() { .... }
+                if (container.kind === 192 /* FunctionExpression */ &&
+                    container.parent.kind === 200 /* BinaryExpression */ &&
+                    ts.getSpecialPropertyAssignmentKind(container.parent) === 3 /* PrototypeProperty */) {
+                    // Get the 'x' of 'x.prototype.y = f' (here, 'f' is 'container')
+                    var className = container.parent // x.prototype.y = f
+                        .left // x.prototype.y
+                        .expression // x.prototype
+                        .expression; // x
                     var classSymbol = checkExpression(className).symbol;
-                    if (classSymbol && classSymbol.members && (classSymbol.flags & 16)) {
+                    if (classSymbol && classSymbol.members && (classSymbol.flags & 16 /* Function */)) {
                         return getFlowTypeOfReference(node, getInferredClassType(classSymbol));
                     }
                 }
@@ -33352,7 +42645,7 @@ var ts;
             }
             if (ts.isClassLike(container.parent)) {
                 var symbol = getSymbolOfNode(container.parent);
-                var type = ts.hasModifier(container, 32) ? getTypeOfSymbol(symbol) : getDeclaredTypeOfSymbol(symbol).thisType;
+                var type = ts.hasModifier(container, 32 /* Static */) ? getTypeOfSymbol(symbol) : getDeclaredTypeOfSymbol(symbol).thisType;
                 return getFlowTypeOfReference(node, type);
             }
             if (ts.isInJavaScriptFile(node)) {
@@ -33364,7 +42657,7 @@ var ts;
         }
         function getTypeForThisExpressionFromJSDoc(node) {
             var jsdocType = ts.getJSDocType(node);
-            if (jsdocType && jsdocType.kind === 284) {
+            if (jsdocType && jsdocType.kind === 284 /* JSDocFunctionType */) {
                 var jsDocFunctionType = jsdocType;
                 if (jsDocFunctionType.parameters.length > 0 &&
                     jsDocFunctionType.parameters[0].name &&
@@ -33374,29 +42667,35 @@ var ts;
             }
         }
         function isInConstructorArgumentInitializer(node, constructorDecl) {
-            return !!ts.findAncestor(node, function (n) { return n === constructorDecl ? "quit" : n.kind === 149; });
+            return !!ts.findAncestor(node, function (n) { return n === constructorDecl ? "quit" : n.kind === 149 /* Parameter */; });
         }
         function checkSuperExpression(node) {
-            var isCallExpression = node.parent.kind === 187 && node.parent.expression === node;
-            var container = ts.getSuperContainer(node, true);
+            var isCallExpression = node.parent.kind === 187 /* CallExpression */ && node.parent.expression === node;
+            var container = ts.getSuperContainer(node, /*stopOnFunctions*/ true);
             var needToCaptureLexicalThis = false;
+            // adjust the container reference in case if super is used inside arrow functions with arbitrarily deep nesting
             if (!isCallExpression) {
-                while (container && container.kind === 193) {
-                    container = ts.getSuperContainer(container, true);
-                    needToCaptureLexicalThis = languageVersion < 2;
+                while (container && container.kind === 193 /* ArrowFunction */) {
+                    container = ts.getSuperContainer(container, /*stopOnFunctions*/ true);
+                    needToCaptureLexicalThis = languageVersion < 2 /* ES2015 */;
                 }
             }
             var canUseSuperExpression = isLegalUsageOfSuperExpression(container);
             var nodeCheckFlag = 0;
             if (!canUseSuperExpression) {
-                var current = ts.findAncestor(node, function (n) { return n === container ? "quit" : n.kind === 147; });
-                if (current && current.kind === 147) {
+                // issue more specific error if super is used in computed property name
+                // class A { foo() { return "1" }}
+                // class B {
+                //     [super.foo()]() {}
+                // }
+                var current = ts.findAncestor(node, function (n) { return n === container ? "quit" : n.kind === 147 /* ComputedPropertyName */; });
+                if (current && current.kind === 147 /* ComputedPropertyName */) {
                     error(node, ts.Diagnostics.super_cannot_be_referenced_in_a_computed_property_name);
                 }
                 else if (isCallExpression) {
                     error(node, ts.Diagnostics.Super_calls_are_not_permitted_outside_constructors_or_in_nested_functions_inside_constructors);
                 }
-                else if (!container || !container.parent || !(ts.isClassLike(container.parent) || container.parent.kind === 184)) {
+                else if (!container || !container.parent || !(ts.isClassLike(container.parent) || container.parent.kind === 184 /* ObjectLiteralExpression */)) {
                     error(node, ts.Diagnostics.super_can_only_be_referenced_in_members_of_derived_classes_or_object_literal_expressions);
                 }
                 else {
@@ -33404,36 +42703,97 @@ var ts;
                 }
                 return errorType;
             }
-            if (!isCallExpression && container.kind === 155) {
+            if (!isCallExpression && container.kind === 155 /* Constructor */) {
                 checkThisBeforeSuper(node, container, ts.Diagnostics.super_must_be_called_before_accessing_a_property_of_super_in_the_constructor_of_a_derived_class);
             }
-            if (ts.hasModifier(container, 32) || isCallExpression) {
-                nodeCheckFlag = 512;
+            if (ts.hasModifier(container, 32 /* Static */) || isCallExpression) {
+                nodeCheckFlag = 512 /* SuperStatic */;
             }
             else {
-                nodeCheckFlag = 256;
+                nodeCheckFlag = 256 /* SuperInstance */;
             }
             getNodeLinks(node).flags |= nodeCheckFlag;
-            if (container.kind === 154 && ts.hasModifier(container, 256)) {
+            // Due to how we emit async functions, we need to specialize the emit for an async method that contains a `super` reference.
+            // This is due to the fact that we emit the body of an async function inside of a generator function. As generator
+            // functions cannot reference `super`, we emit a helper inside of the method body, but outside of the generator. This helper
+            // uses an arrow function, which is permitted to reference `super`.
+            //
+            // There are two primary ways we can access `super` from within an async method. The first is getting the value of a property
+            // or indexed access on super, either as part of a right-hand-side expression or call expression. The second is when setting the value
+            // of a property or indexed access, either as part of an assignment expression or destructuring assignment.
+            //
+            // The simplest case is reading a value, in which case we will emit something like the following:
+            //
+            //  // ts
+            //  ...
+            //  async asyncMethod() {
+            //    let x = await super.asyncMethod();
+            //    return x;
+            //  }
+            //  ...
+            //
+            //  // js
+            //  ...
+            //  asyncMethod() {
+            //      const _super = name => super[name];
+            //      return __awaiter(this, arguments, Promise, function *() {
+            //          let x = yield _super("asyncMethod").call(this);
+            //          return x;
+            //      });
+            //  }
+            //  ...
+            //
+            // The more complex case is when we wish to assign a value, especially as part of a destructuring assignment. As both cases
+            // are legal in ES6, but also likely less frequent, we emit the same more complex helper for both scenarios:
+            //
+            //  // ts
+            //  ...
+            //  async asyncMethod(ar: Promise<any[]>) {
+            //      [super.a, super.b] = await ar;
+            //  }
+            //  ...
+            //
+            //  // js
+            //  ...
+            //  asyncMethod(ar) {
+            //      const _super = (function (geti, seti) {
+            //          const cache = Object.create(null);
+            //          return name => cache[name] || (cache[name] = { get value() { return geti(name); }, set value(v) { seti(name, v); } });
+            //      })(name => super[name], (name, value) => super[name] = value);
+            //      return __awaiter(this, arguments, Promise, function *() {
+            //          [_super("a").value, _super("b").value] = yield ar;
+            //      });
+            //  }
+            //  ...
+            //
+            // This helper creates an object with a "value" property that wraps the `super` property or indexed access for both get and set.
+            // This is required for destructuring assignments, as a call expression cannot be used as the target of a destructuring assignment
+            // while a property access can.
+            if (container.kind === 154 /* MethodDeclaration */ && ts.hasModifier(container, 256 /* Async */)) {
                 if (ts.isSuperProperty(node.parent) && ts.isAssignmentTarget(node.parent)) {
-                    getNodeLinks(container).flags |= 4096;
+                    getNodeLinks(container).flags |= 4096 /* AsyncMethodWithSuperBinding */;
                 }
                 else {
-                    getNodeLinks(container).flags |= 2048;
+                    getNodeLinks(container).flags |= 2048 /* AsyncMethodWithSuper */;
                 }
             }
             if (needToCaptureLexicalThis) {
+                // call expressions are allowed only in constructors so they should always capture correct 'this'
+                // super property access expressions can also appear in arrow functions -
+                // in this case they should also use correct lexical this
                 captureLexicalThis(node.parent, container);
             }
-            if (container.parent.kind === 184) {
-                if (languageVersion < 2) {
+            if (container.parent.kind === 184 /* ObjectLiteralExpression */) {
+                if (languageVersion < 2 /* ES2015 */) {
                     error(node, ts.Diagnostics.super_is_only_allowed_in_members_of_object_literal_expressions_when_option_target_is_ES2015_or_higher);
                     return errorType;
                 }
                 else {
+                    // for object literal assume that type of 'super' is 'any'
                     return anyType;
                 }
             }
+            // at this point the only legal case for parent is ClassLikeDeclaration
             var classLikeDeclaration = container.parent;
             if (!ts.getClassExtendsHeritageClauseElement(classLikeDeclaration)) {
                 error(node, ts.Diagnostics.super_can_only_be_referenced_in_a_derived_class);
@@ -33444,11 +42804,12 @@ var ts;
             if (!baseClassType) {
                 return errorType;
             }
-            if (container.kind === 155 && isInConstructorArgumentInitializer(node, container)) {
+            if (container.kind === 155 /* Constructor */ && isInConstructorArgumentInitializer(node, container)) {
+                // issue custom error message for super property access in constructor arguments (to be aligned with old compiler)
                 error(node, ts.Diagnostics.super_cannot_be_referenced_in_constructor_arguments);
                 return errorType;
             }
-            return nodeCheckFlag === 512
+            return nodeCheckFlag === 512 /* SuperStatic */
                 ? getBaseConstructorTypeOfClass(classType)
                 : getTypeWithThisArgument(baseClassType, classType.thisType);
             function isLegalUsageOfSuperExpression(container) {
@@ -33456,24 +42817,31 @@ var ts;
                     return false;
                 }
                 if (isCallExpression) {
-                    return container.kind === 155;
+                    // TS 1.0 SPEC (April 2014): 4.8.1
+                    // Super calls are only permitted in constructors of derived classes
+                    return container.kind === 155 /* Constructor */;
                 }
                 else {
-                    if (ts.isClassLike(container.parent) || container.parent.kind === 184) {
-                        if (ts.hasModifier(container, 32)) {
-                            return container.kind === 154 ||
-                                container.kind === 153 ||
-                                container.kind === 156 ||
-                                container.kind === 157;
+                    // TS 1.0 SPEC (April 2014)
+                    // 'super' property access is allowed
+                    // - In a constructor, instance member function, instance member accessor, or instance member variable initializer where this references a derived class instance
+                    // - In a static member function or static member accessor
+                    // topmost container must be something that is directly nested in the class declaration\object literal expression
+                    if (ts.isClassLike(container.parent) || container.parent.kind === 184 /* ObjectLiteralExpression */) {
+                        if (ts.hasModifier(container, 32 /* Static */)) {
+                            return container.kind === 154 /* MethodDeclaration */ ||
+                                container.kind === 153 /* MethodSignature */ ||
+                                container.kind === 156 /* GetAccessor */ ||
+                                container.kind === 157 /* SetAccessor */;
                         }
                         else {
-                            return container.kind === 154 ||
-                                container.kind === 153 ||
-                                container.kind === 156 ||
-                                container.kind === 157 ||
-                                container.kind === 152 ||
-                                container.kind === 151 ||
-                                container.kind === 155;
+                            return container.kind === 154 /* MethodDeclaration */ ||
+                                container.kind === 153 /* MethodSignature */ ||
+                                container.kind === 156 /* GetAccessor */ ||
+                                container.kind === 157 /* SetAccessor */ ||
+                                container.kind === 152 /* PropertyDeclaration */ ||
+                                container.kind === 151 /* PropertySignature */ ||
+                                container.kind === 155 /* Constructor */;
                         }
                     }
                 }
@@ -33481,22 +42849,22 @@ var ts;
             }
         }
         function getContainingObjectLiteral(func) {
-            return (func.kind === 154 ||
-                func.kind === 156 ||
-                func.kind === 157) && func.parent.kind === 184 ? func.parent :
-                func.kind === 192 && func.parent.kind === 270 ? func.parent.parent :
+            return (func.kind === 154 /* MethodDeclaration */ ||
+                func.kind === 156 /* GetAccessor */ ||
+                func.kind === 157 /* SetAccessor */) && func.parent.kind === 184 /* ObjectLiteralExpression */ ? func.parent :
+                func.kind === 192 /* FunctionExpression */ && func.parent.kind === 270 /* PropertyAssignment */ ? func.parent.parent :
                     undefined;
         }
         function getThisTypeArgument(type) {
-            return ts.getObjectFlags(type) & 4 && type.target === globalThisType ? type.typeArguments[0] : undefined;
+            return ts.getObjectFlags(type) & 4 /* Reference */ && type.target === globalThisType ? type.typeArguments[0] : undefined;
         }
         function getThisTypeFromContextualType(type) {
             return mapType(type, function (t) {
-                return t.flags & 524288 ? ts.forEach(t.types, getThisTypeArgument) : getThisTypeArgument(t);
+                return t.flags & 524288 /* Intersection */ ? ts.forEach(t.types, getThisTypeArgument) : getThisTypeArgument(t);
             });
         }
         function getContextualThisParameterType(func) {
-            if (func.kind === 193) {
+            if (func.kind === 193 /* ArrowFunction */) {
                 return undefined;
             }
             if (isContextSensitiveFunctionOrObjectLiteralMethod(func)) {
@@ -33512,6 +42880,9 @@ var ts;
             if (noImplicitThis || inJs) {
                 var containingLiteral = getContainingObjectLiteral(func);
                 if (containingLiteral) {
+                    // We have an object literal method. Check if the containing object literal has a contextual type
+                    // that includes a ThisType<T>. If so, T is the contextual type for 'this'. We continue looking in
+                    // any directly enclosing object literals.
                     var contextualType = getApparentTypeOfContextualType(containingLiteral);
                     var literal = containingLiteral;
                     var type = contextualType;
@@ -33520,19 +42891,25 @@ var ts;
                         if (thisType) {
                             return instantiateType(thisType, getContextualMapper(containingLiteral));
                         }
-                        if (literal.parent.kind !== 270) {
+                        if (literal.parent.kind !== 270 /* PropertyAssignment */) {
                             break;
                         }
                         literal = literal.parent.parent;
                         type = getApparentTypeOfContextualType(literal);
                     }
+                    // There was no contextual ThisType<T> for the containing object literal, so the contextual type
+                    // for 'this' is the non-null form of the contextual type for the containing object literal or
+                    // the type of the object literal itself.
                     return contextualType ? getNonNullableType(contextualType) : checkExpressionCached(containingLiteral);
                 }
+                // In an assignment of the form 'obj.xxx = function(...)' or 'obj[xxx] = function(...)', the
+                // contextual type for 'this' is 'obj'.
                 var parent = func.parent;
-                if (parent.kind === 200 && parent.operatorToken.kind === 58) {
+                if (parent.kind === 200 /* BinaryExpression */ && parent.operatorToken.kind === 58 /* EqualsToken */) {
                     var target = parent.left;
-                    if (target.kind === 185 || target.kind === 186) {
+                    if (target.kind === 185 /* PropertyAccessExpression */ || target.kind === 186 /* ElementAccessExpression */) {
                         var expression = target.expression;
+                        // Don't contextually type `this` as `exports` in `exports.Point = function(x, y) { this.x = x; this.y = y; }`
                         if (inJs && ts.isIdentifier(expression)) {
                             var sourceFile = ts.getSourceFileOfNode(parent);
                             if (sourceFile.commonJsModuleIndicator && getResolvedSymbol(expression) === sourceFile.symbol) {
@@ -33545,6 +42922,7 @@ var ts;
             }
             return undefined;
         }
+        // Return contextual type of parameter or undefined if no contextual type is available
         function getContextuallyTypedParameterType(parameter) {
             var func = parameter.parent;
             if (!isContextSensitiveFunctionOrObjectLiteralMethod(func)) {
@@ -33575,12 +42953,13 @@ var ts;
                 var len = func.parameters.length - (funcHasRestParameters ? 1 : 0);
                 var indexOfParameter = func.parameters.indexOf(parameter);
                 if (ts.getThisParameter(func) !== undefined && !contextualSignature.thisParameter) {
-                    ts.Debug.assert(indexOfParameter !== 0);
+                    ts.Debug.assert(indexOfParameter !== 0); // Otherwise we should not have called `getContextuallyTypedParameterType`.
                     indexOfParameter -= 1;
                 }
                 if (indexOfParameter < len) {
                     return getTypeAtPosition(contextualSignature, indexOfParameter);
                 }
+                // If last parameter is contextually rest parameter get its type
                 if (funcHasRestParameters &&
                     indexOfParameter === (func.parameters.length - 1) &&
                     isRestParameterIndex(contextualSignature, func.parameters.length - 1)) {
@@ -33588,6 +42967,14 @@ var ts;
                 }
             }
         }
+        // In a variable, parameter or property declaration with a type annotation,
+        //   the contextual type of an initializer expression is the type of the variable, parameter or property.
+        // Otherwise, in a parameter declaration of a contextually typed function expression,
+        //   the contextual type of an initializer expression is the contextual type of the parameter.
+        // Otherwise, in a variable or parameter declaration with a binding pattern name,
+        //   the contextual type of an initializer expression is the type implied by the binding pattern.
+        // Otherwise, in a binding pattern inside a variable or parameter declaration,
+        //   the contextual type of an initializer expression is the type annotation of the containing declaration, if present.
         function getContextualTypeForInitializerExpression(node) {
             var declaration = node.parent;
             if (ts.hasInitializer(declaration) && node === declaration.initializer) {
@@ -33595,19 +42982,19 @@ var ts;
                 if (typeNode) {
                     return getTypeFromTypeNode(typeNode);
                 }
-                if (declaration.kind === 149) {
+                if (declaration.kind === 149 /* Parameter */) {
                     var type = getContextuallyTypedParameterType(declaration);
                     if (type) {
                         return type;
                     }
                 }
                 if (ts.isBindingPattern(declaration.name)) {
-                    return getTypeFromBindingPattern(declaration.name, true, false);
+                    return getTypeFromBindingPattern(declaration.name, /*includePatternInType*/ true, /*reportErrors*/ false);
                 }
                 if (ts.isBindingPattern(declaration.parent)) {
                     var parentDeclaration = declaration.parent.parent;
                     var name = declaration.propertyName || declaration.name;
-                    if (parentDeclaration.kind !== 182) {
+                    if (parentDeclaration.kind !== 182 /* BindingElement */) {
                         var parentTypeNode = ts.getEffectiveTypeAnnotationNode(parentDeclaration);
                         if (parentTypeNode && !ts.isBindingPattern(name)) {
                             var text = ts.getTextOfPropertyName(name);
@@ -33624,13 +43011,13 @@ var ts;
             var func = ts.getContainingFunction(node);
             if (func) {
                 var functionFlags = ts.getFunctionFlags(func);
-                if (functionFlags & 1) {
+                if (functionFlags & 1 /* Generator */) { // AsyncGenerator function or Generator function
                     return undefined;
                 }
                 var contextualReturnType = getContextualReturnType(func);
-                return functionFlags & 2
-                    ? contextualReturnType && getAwaitedTypeOfPromise(contextualReturnType)
-                    : contextualReturnType;
+                return functionFlags & 2 /* Async */
+                    ? contextualReturnType && getAwaitedTypeOfPromise(contextualReturnType) // Async function
+                    : contextualReturnType; // Regular function
             }
             return undefined;
         }
@@ -33642,7 +43029,7 @@ var ts;
                 if (contextualReturnType) {
                     return node.asteriskToken
                         ? contextualReturnType
-                        : getIteratedTypeOfGenerator(contextualReturnType, (functionFlags & 2) !== 0);
+                        : getIteratedTypeOfGenerator(contextualReturnType, (functionFlags & 2 /* Async */) !== 0);
                 }
             }
             return undefined;
@@ -33661,28 +43048,35 @@ var ts;
             return false;
         }
         function getContextualReturnType(functionDecl) {
-            if (functionDecl.kind === 155 ||
+            // If the containing function has a return type annotation, is a constructor, or is a get accessor whose
+            // corresponding set accessor has a type annotation, return statements in the function are contextually typed
+            if (functionDecl.kind === 155 /* Constructor */ ||
                 ts.getEffectiveReturnTypeNode(functionDecl) ||
                 isGetAccessorWithAnnotatedSetAccessor(functionDecl)) {
                 return getReturnTypeOfSignature(getSignatureFromDeclaration(functionDecl));
             }
+            // Otherwise, if the containing function is contextually typed by a function type with exactly one call signature
+            // and that call signature is non-generic, return statements are contextually typed by the return type of the signature
             var signature = getContextualSignatureForFunctionLikeDeclaration(functionDecl);
             if (signature && !isResolvingReturnTypeOfSignature(signature)) {
                 return getReturnTypeOfSignature(signature);
             }
             return undefined;
         }
+        // In a typed function call, an argument or substitution expression is contextually typed by the type of the corresponding parameter.
         function getContextualTypeForArgument(callTarget, arg) {
-            var args = getEffectiveCallArguments(callTarget);
-            var argIndex = args.indexOf(arg);
+            var args = getEffectiveCallArguments(callTarget); // TODO: GH#18217
+            var argIndex = args.indexOf(arg); // -1 for e.g. the expression of a CallExpression, or the tag of a TaggedTemplateExpression
             return argIndex === -1 ? undefined : getContextualTypeForArgumentAtIndex(callTarget, argIndex);
         }
         function getContextualTypeForArgumentAtIndex(callTarget, argIndex) {
+            // If we're already in the process of resolving the given signature, don't resolve again as
+            // that could cause infinite recursion. Instead, return anySignature.
             var signature = getNodeLinks(callTarget).resolvedSignature === resolvingSignature ? resolvingSignature : getResolvedSignature(callTarget);
             return getTypeAtPosition(signature, argIndex);
         }
         function getContextualTypeForSubstitutionExpression(template, substitutionExpression) {
-            if (template.parent.kind === 189) {
+            if (template.parent.kind === 189 /* TaggedTemplateExpression */) {
                 return getContextualTypeForArgument(template.parent, substitutionExpression);
             }
             return undefined;
@@ -33691,31 +43085,38 @@ var ts;
             var binaryExpression = node.parent;
             var left = binaryExpression.left, operatorToken = binaryExpression.operatorToken, right = binaryExpression.right;
             switch (operatorToken.kind) {
-                case 58:
+                case 58 /* EqualsToken */:
                     return node === right && isContextSensitiveAssignment(binaryExpression) ? getTypeOfExpression(left) : undefined;
-                case 54:
+                case 54 /* BarBarToken */:
+                    // When an || expression has a contextual type, the operands are contextually typed by that type. When an ||
+                    // expression has no contextual type, the right operand is contextually typed by the type of the left operand,
+                    // except for the special case of Javascript declarations of the form `namespace.prop = namespace.prop || {}`
                     var type = getContextualType(binaryExpression);
                     return !type && node === right && !ts.isDefaultedJavascriptInitializer(binaryExpression) ?
                         getTypeOfExpression(left) : type;
-                case 53:
-                case 26:
+                case 53 /* AmpersandAmpersandToken */:
+                case 26 /* CommaToken */:
                     return node === right ? getContextualType(binaryExpression) : undefined;
                 default:
                     return undefined;
             }
         }
+        // In an assignment expression, the right operand is contextually typed by the type of the left operand.
+        // Don't do this for special property assignments to avoid circularity.
         function isContextSensitiveAssignment(binaryExpression) {
             var kind = ts.getSpecialPropertyAssignmentKind(binaryExpression);
             switch (kind) {
-                case 0:
+                case 0 /* None */:
                     return true;
-                case 5:
+                case 5 /* Property */:
+                    // If `binaryExpression.left` was assigned a symbol, then this is a new declaration; otherwise it is an assignment to an existing declaration.
+                    // See `bindStaticPropertyAssignment` in `binder.ts`.
                     return !binaryExpression.left.symbol;
-                case 1:
-                case 2:
-                case 3:
-                case 4:
-                case 6:
+                case 1 /* ExportsProperty */:
+                case 2 /* ModuleExports */:
+                case 3 /* PrototypeProperty */:
+                case 4 /* ThisProperty */:
+                case 6 /* Prototype */:
                     return false;
                 default:
                     return ts.Debug.assertNever(kind);
@@ -33723,19 +43124,24 @@ var ts;
         }
         function getTypeOfPropertyOfContextualType(type, name) {
             return mapType(type, function (t) {
-                var prop = t.flags & 917504 ? getPropertyOfType(t, name) : undefined;
+                var prop = t.flags & 917504 /* StructuredType */ ? getPropertyOfType(t, name) : undefined;
                 return prop ? getTypeOfSymbol(prop) : undefined;
-            }, true);
+            }, /*noReductions*/ true);
         }
         function getIndexTypeOfContextualType(type, kind) {
-            return mapType(type, function (t) { return getIndexTypeOfStructuredType(t, kind); }, true);
+            return mapType(type, function (t) { return getIndexTypeOfStructuredType(t, kind); }, /*noReductions*/ true);
         }
+        // Return true if the given contextual type is a tuple-like type
         function contextualTypeIsTupleLikeType(type) {
-            return !!(type.flags & 262144 ? ts.forEach(type.types, isTupleLikeType) : isTupleLikeType(type));
+            return !!(type.flags & 262144 /* Union */ ? ts.forEach(type.types, isTupleLikeType) : isTupleLikeType(type));
         }
+        // In an object literal contextually typed by a type T, the contextual type of a property assignment is the type of
+        // the matching property in T, if one exists. Otherwise, it is the type of the numeric index signature in T, if one
+        // exists. Otherwise, it is the type of the string index signature in T, if one exists.
         function getContextualTypeForObjectLiteralMethod(node) {
             ts.Debug.assert(ts.isObjectLiteralMethod(node));
-            if (node.flags & 8388608) {
+            if (node.flags & 8388608 /* InWithStatement */) {
+                // We cannot answer semantic questions within a with block, do not proceed any further
                 return undefined;
             }
             return getContextualTypeForObjectLiteralElement(node);
@@ -33745,28 +43151,37 @@ var ts;
             var type = getApparentTypeOfContextualType(objectLiteral);
             if (type) {
                 if (!hasNonBindableDynamicName(element)) {
+                    // For a (non-symbol) computed property, there is no reason to look up the name
+                    // in the type. It will just be "__computed", which does not appear in any
+                    // SymbolTable.
                     var symbolName_1 = getSymbolOfNode(element).escapedName;
                     var propertyType = getTypeOfPropertyOfContextualType(type, symbolName_1);
                     if (propertyType) {
                         return propertyType;
                     }
                 }
-                return isNumericName(element.name) && getIndexTypeOfContextualType(type, 1) ||
-                    getIndexTypeOfContextualType(type, 0);
+                return isNumericName(element.name) && getIndexTypeOfContextualType(type, 1 /* Number */) ||
+                    getIndexTypeOfContextualType(type, 0 /* String */);
             }
             return undefined;
         }
+        // In an array literal contextually typed by a type T, the contextual type of an element expression at index N is
+        // the type of the property with the numeric name N in T, if one exists. Otherwise, if T has a numeric index signature,
+        // it is the type of the numeric index signature in T. Otherwise, in ES6 and higher, the contextual type is the iterated
+        // type of T.
         function getContextualTypeForElementExpression(arrayContextualType, index) {
             return arrayContextualType && (getTypeOfPropertyOfContextualType(arrayContextualType, "" + index)
-                || getIndexTypeOfContextualType(arrayContextualType, 1)
-                || getIteratedTypeOrElementType(arrayContextualType, undefined, false, false, false));
+                || getIndexTypeOfContextualType(arrayContextualType, 1 /* Number */)
+                || getIteratedTypeOrElementType(arrayContextualType, /*errorNode*/ undefined, /*allowStringInput*/ false, /*allowAsyncIterables*/ false, /*checkAssignability*/ false));
         }
+        // In a contextually typed conditional expression, the true/false expressions are contextually typed by the same type.
         function getContextualTypeForConditionalOperand(node) {
             var conditional = node.parent;
             return node === conditional.whenTrue || node === conditional.whenFalse ? getContextualType(conditional) : undefined;
         }
         function getContextualTypeForChildJsxExpression(node) {
             var attributesType = getApparentTypeOfContextualType(node.openingElement.tagName);
+            // JSX expression is in children of JSX Element, we will look for an "children" atttribute (we get the name from JSX.ElementAttributesProperty)
             var jsxChildrenPropertyName = getJsxElementChildrenPropertyName(getJsxNamespaceAt(node));
             return attributesType && !isTypeAny(attributesType) && jsxChildrenPropertyName && jsxChildrenPropertyName !== "" ? getTypeOfPropertyOfContextualType(attributesType, jsxChildrenPropertyName) : undefined;
         }
@@ -33779,6 +43194,9 @@ var ts;
                     : undefined;
         }
         function getContextualTypeForJsxAttribute(attribute) {
+            // When we trying to resolve JsxOpeningLikeElement as a stateless function element, we will already give its attributes a contextual type
+            // which is a type of the parameter of the signature we are trying out.
+            // If there is no contextual type (e.g. we are trying to resolve stateful component), get attributes type from resolving element's tagName
             if (ts.isJsxAttribute(attribute)) {
                 var attributesType = getApparentTypeOfContextualType(attribute.parent);
                 if (!attributesType || isTypeAny(attributesType)) {
@@ -33790,44 +43208,50 @@ var ts;
                 return getContextualType(attribute.parent);
             }
         }
+        // Return true if the given expression is possibly a discriminant value. We limit the kinds of
+        // expressions we check to those that don't depend on their contextual type in order not to cause
+        // recursive (and possibly infinite) invocations of getContextualType.
         function isPossiblyDiscriminantValue(node) {
             switch (node.kind) {
-                case 9:
-                case 8:
-                case 13:
-                case 101:
-                case 86:
-                case 95:
-                case 71:
+                case 9 /* StringLiteral */:
+                case 8 /* NumericLiteral */:
+                case 13 /* NoSubstitutionTemplateLiteral */:
+                case 101 /* TrueKeyword */:
+                case 86 /* FalseKeyword */:
+                case 95 /* NullKeyword */:
+                case 71 /* Identifier */:
                     return true;
-                case 185:
-                case 191:
+                case 185 /* PropertyAccessExpression */:
+                case 191 /* ParenthesizedExpression */:
                     return isPossiblyDiscriminantValue(node.expression);
             }
             return false;
         }
+        // Return the contextual type for a given expression node. During overload resolution, a contextual type may temporarily
+        // be "pushed" onto a node using the contextualType property.
         function getApparentTypeOfContextualType(node) {
             var contextualType = getContextualType(node);
             contextualType = contextualType && mapType(contextualType, getApparentType);
-            if (!(contextualType && contextualType.flags & 262144 && ts.isObjectLiteralExpression(node))) {
+            if (!(contextualType && contextualType.flags & 262144 /* Union */ && ts.isObjectLiteralExpression(node))) {
                 return contextualType;
             }
+            // Keep the below up-to-date with the work done within `isRelatedTo` by `findMatchingDiscriminantType`
             var match;
             propLoop: for (var _i = 0, _a = node.properties; _i < _a.length; _i++) {
                 var prop = _a[_i];
                 if (!prop.symbol)
                     continue;
-                if (prop.kind !== 270)
+                if (prop.kind !== 270 /* PropertyAssignment */)
                     continue;
                 if (isPossiblyDiscriminantValue(prop.initializer) && isDiscriminantProperty(contextualType, prop.symbol.escapedName)) {
                     var discriminatingType = checkExpression(prop.initializer);
                     for (var _b = 0, _c = contextualType.types; _b < _c.length; _b++) {
                         var type = _c[_b];
                         var targetType = getTypeOfPropertyOfType(type, prop.symbol.escapedName);
-                        if (targetType && checkTypeAssignableTo(discriminatingType, targetType, undefined)) {
+                        if (targetType && checkTypeAssignableTo(discriminatingType, targetType, /*errorNode*/ undefined)) {
                             if (match) {
                                 if (type === match)
-                                    continue;
+                                    continue; // Finding multiple fields which discriminate to the same type is fine
                                 match = undefined;
                                 break propLoop;
                             }
@@ -33838,8 +43262,26 @@ var ts;
             }
             return match || contextualType;
         }
+        /**
+         * Woah! Do you really want to use this function?
+         *
+         * Unless you're trying to get the *non-apparent* type for a
+         * value-literal type or you're authoring relevant portions of this algorithm,
+         * you probably meant to use 'getApparentTypeOfContextualType'.
+         * Otherwise this may not be very useful.
+         *
+         * In cases where you *are* working on this function, you should understand
+         * when it is appropriate to use 'getContextualType' and 'getApparentTypeOfContextualType'.
+         *
+         *   - Use 'getContextualType' when you are simply going to propagate the result to the expression.
+         *   - Use 'getApparentTypeOfContextualType' when you're going to need the members of the type.
+         *
+         * @param node the expression whose contextual type will be returned.
+         * @returns the contextual type of an expression.
+         */
         function getContextualType(node) {
-            if (node.flags & 8388608) {
+            if (node.flags & 8388608 /* InWithStatement */) {
+                // We cannot answer semantic questions within a with block, do not proceed any further
                 return undefined;
             }
             if (node.contextualType) {
@@ -33847,51 +43289,52 @@ var ts;
             }
             var parent = node.parent;
             switch (parent.kind) {
-                case 232:
-                case 149:
-                case 152:
-                case 151:
-                case 182:
+                case 232 /* VariableDeclaration */:
+                case 149 /* Parameter */:
+                case 152 /* PropertyDeclaration */:
+                case 151 /* PropertySignature */:
+                case 182 /* BindingElement */:
                     return getContextualTypeForInitializerExpression(node);
-                case 193:
-                case 225:
+                case 193 /* ArrowFunction */:
+                case 225 /* ReturnStatement */:
                     return getContextualTypeForReturnExpression(node);
-                case 203:
+                case 203 /* YieldExpression */:
                     return getContextualTypeForYieldOperand(parent);
-                case 187:
-                case 188:
+                case 187 /* CallExpression */:
+                case 188 /* NewExpression */:
                     return getContextualTypeForArgument(parent, node);
-                case 190:
-                case 208:
+                case 190 /* TypeAssertionExpression */:
+                case 208 /* AsExpression */:
                     return getTypeFromTypeNode(parent.type);
-                case 200:
+                case 200 /* BinaryExpression */:
                     return getContextualTypeForBinaryOperand(node);
-                case 270:
-                case 271:
+                case 270 /* PropertyAssignment */:
+                case 271 /* ShorthandPropertyAssignment */:
                     return getContextualTypeForObjectLiteralElement(parent);
-                case 272:
+                case 272 /* SpreadAssignment */:
                     return getApparentTypeOfContextualType(parent.parent);
-                case 183: {
+                case 183 /* ArrayLiteralExpression */: {
                     var arrayLiteral = parent;
                     var type = getApparentTypeOfContextualType(arrayLiteral);
                     return getContextualTypeForElementExpression(type, ts.indexOfNode(arrayLiteral.elements, node));
                 }
-                case 201:
+                case 201 /* ConditionalExpression */:
                     return getContextualTypeForConditionalOperand(node);
-                case 211:
-                    ts.Debug.assert(parent.parent.kind === 202);
+                case 211 /* TemplateSpan */:
+                    ts.Debug.assert(parent.parent.kind === 202 /* TemplateExpression */);
                     return getContextualTypeForSubstitutionExpression(parent.parent, node);
-                case 191: {
+                case 191 /* ParenthesizedExpression */: {
+                    // Like in `checkParenthesizedExpression`, an `/** @type {xyz} */` comment before a parenthesized expression acts as a type cast.
                     var tag = ts.isInJavaScriptFile(parent) ? ts.getJSDocTypeTag(parent) : undefined;
                     return tag ? getTypeFromTypeNode(tag.typeExpression.type) : getContextualType(parent);
                 }
-                case 265:
+                case 265 /* JsxExpression */:
                     return getContextualTypeForJsxExpression(parent);
-                case 262:
-                case 264:
+                case 262 /* JsxAttribute */:
+                case 264 /* JsxSpreadAttribute */:
                     return getContextualTypeForJsxAttribute(parent);
-                case 257:
-                case 256:
+                case 257 /* JsxOpeningElement */:
+                case 256 /* JsxSelfClosingElement */:
                     return getContextualJsxElementAttributesType(parent);
             }
             return undefined;
@@ -33906,16 +43349,22 @@ var ts;
             }
             var valueType = checkExpression(node.tagName);
             if (isTypeAny(valueType)) {
+                // Short-circuit if the class tag is using an element type 'any'
                 return anyType;
             }
             var isJs = ts.isInJavaScriptFile(node);
             return mapType(valueType, function (t) { return getJsxSignaturesParameterTypes(t, isJs, node); });
         }
         function getJsxSignaturesParameterTypes(valueType, isJs, context) {
-            if (valueType.flags & 4) {
+            // If the elemType is a string type, we have to return anyType to prevent an error downstream as we will try to find construct or call signature of the type
+            if (valueType.flags & 4 /* String */) {
                 return anyType;
             }
-            else if (valueType.flags & 64) {
+            else if (valueType.flags & 64 /* StringLiteral */) {
+                // If the elemType is a stringLiteral type, we can then provide a check to make sure that the string literal type is one of the Jsx intrinsic element type
+                // For example:
+                //      var CustomTag: "h1" = "h1";
+                //      <CustomTag> Hello World </CustomTag>
                 var intrinsicElementsType = getJsxType(JsxNames.IntrinsicElements, context);
                 if (intrinsicElementsType !== errorType) {
                     var stringLiteralTypeName = valueType.value;
@@ -33923,19 +43372,22 @@ var ts;
                     if (intrinsicProp) {
                         return getTypeOfSymbol(intrinsicProp);
                     }
-                    var indexSignatureType = getIndexTypeOfType(intrinsicElementsType, 0);
+                    var indexSignatureType = getIndexTypeOfType(intrinsicElementsType, 0 /* String */);
                     if (indexSignatureType) {
                         return indexSignatureType;
                     }
                 }
                 return anyType;
             }
-            var signatures = getSignaturesOfType(valueType, 1);
+            // Resolve the signatures, preferring constructor
+            var signatures = getSignaturesOfType(valueType, 1 /* Construct */);
             var ctor = true;
             if (signatures.length === 0) {
-                signatures = getSignaturesOfType(valueType, 0);
+                // No construct signatures, try call signatures
+                signatures = getSignaturesOfType(valueType, 0 /* Call */);
                 ctor = false;
                 if (signatures.length === 0) {
+                    // We found no signatures at all, which is an error
                     return errorType;
                 }
             }
@@ -33952,7 +43404,7 @@ var ts;
                 links.resolvedSignatures.set(cacheKey, resolvingSignaturesArray);
                 links.resolvedSignatures.set(cacheKey, signatures = instantiateJsxSignatures(context, signatures));
             }
-            return getUnionType(ts.map(signatures, ctor ? function (t) { return getJsxPropsTypeFromClassType(t, isJs, context, false); } : function (t) { return getJsxPropsTypeFromCallSignature(t, context); }), 0);
+            return getUnionType(ts.map(signatures, ctor ? function (t) { return getJsxPropsTypeFromClassType(t, isJs, context, /*reportErrors*/ false); } : function (t) { return getJsxPropsTypeFromCallSignature(t, context); }), 0 /* None */);
         }
         function getJsxPropsTypeFromCallSignature(sig, context) {
             var propsType = getTypeOfFirstParameterOfSignatureWithFallback(sig, emptyObjectType);
@@ -33969,20 +43421,26 @@ var ts;
         function getJsxPropsTypeFromClassType(sig, isJs, context, reportErrors) {
             var forcedLookupLocation = getJsxElementPropertiesName(getJsxNamespaceAt(context));
             var attributesType = forcedLookupLocation === undefined
+                // If there is no type ElementAttributesProperty, return the type of the first parameter of the signature, which should be the props type
                 ? getTypeOfFirstParameterOfSignatureWithFallback(sig, emptyObjectType)
                 : forcedLookupLocation === ""
+                    // If there is no e.g. 'props' member in ElementAttributesProperty, use the element class type instead
                     ? getReturnTypeOfSignature(sig)
+                    // Otherwise get the type of the property on the signature return type
                     : getJsxPropsTypeForSignatureFromMember(sig, forcedLookupLocation);
             if (!attributesType) {
+                // There is no property named 'props' on this instance type
                 if (reportErrors && !!forcedLookupLocation && !!ts.length(context.attributes.properties)) {
                     error(context, ts.Diagnostics.JSX_element_class_does_not_support_attributes_because_it_does_not_have_a_0_property, ts.unescapeLeadingUnderscores(forcedLookupLocation));
                 }
                 return emptyObjectType;
             }
             else if (isTypeAny(attributesType)) {
+                // Props is of type 'any' or unknown
                 return attributesType;
             }
             else {
+                // Normal case -- add in IntrinsicClassElements<T> and IntrinsicElements
                 var apparentAttributesType = attributesType;
                 var intrinsicClassAttribs = getJsxType(JsxNames.IntrinsicClassAttributes, context);
                 if (intrinsicClassAttribs !== errorType) {
@@ -33999,8 +43457,10 @@ var ts;
                 return apparentAttributesType;
             }
         }
+        // If the given type is an object or union type with a single signature, and if that signature has at
+        // least as many parameters as the given function, return the signature. Otherwise return undefined.
         function getContextualCallSignature(type, node) {
-            var signatures = getSignaturesOfType(type, 0);
+            var signatures = getSignaturesOfType(type, 0 /* Call */);
             if (signatures.length === 1) {
                 var signature = signatures[0];
                 if (!isAritySmaller(signature, node)) {
@@ -34008,6 +43468,7 @@ var ts;
                 }
             }
         }
+        /** If the contextual signature has fewer parameters than the function expression, do not use it */
         function isAritySmaller(signature, target) {
             var targetParameterCount = 0;
             for (; targetParameterCount < target.parameters.length; targetParameterCount++) {
@@ -34023,9 +43484,10 @@ var ts;
             return sourceLength < targetParameterCount;
         }
         function isFunctionExpressionOrArrowFunction(node) {
-            return node.kind === 192 || node.kind === 193;
+            return node.kind === 192 /* FunctionExpression */ || node.kind === 193 /* ArrowFunction */;
         }
         function getContextualSignatureForFunctionLikeDeclaration(node) {
+            // Only function expressions, arrow functions, and object literal methods are contextually typed.
             return isFunctionExpressionOrArrowFunction(node) || ts.isObjectLiteralMethod(node)
                 ? getContextualSignature(node)
                 : undefined;
@@ -34035,8 +43497,13 @@ var ts;
                 getContextualTypeForObjectLiteralMethod(node) :
                 getApparentTypeOfContextualType(node);
         }
+        // Return the contextual signature for a given expression node. A contextual type provides a
+        // contextual signature if it has a single call signature and if that call signature is non-generic.
+        // If the contextual type is a union type, get the signature from each type possible and if they are
+        // all identical ignoring their return type, the result is same signature but with return type as
+        // union type of return types from these signatures
         function getContextualSignature(node) {
-            ts.Debug.assert(node.kind !== 154 || ts.isObjectLiteralMethod(node));
+            ts.Debug.assert(node.kind !== 154 /* MethodDeclaration */ || ts.isObjectLiteralMethod(node));
             var type;
             if (ts.isInJavaScriptFile(node)) {
                 var jsdoc = ts.getJSDocType(node);
@@ -34050,7 +43517,7 @@ var ts;
             if (!type) {
                 return undefined;
             }
-            if (!(type.flags & 262144)) {
+            if (!(type.flags & 262144 /* Union */)) {
                 return getContextualCallSignature(type, node);
             }
             var signatureList;
@@ -34060,16 +43527,20 @@ var ts;
                 var signature = getContextualCallSignature(current, node);
                 if (signature) {
                     if (!signatureList) {
+                        // This signature will contribute to contextual union signature
                         signatureList = [signature];
                     }
-                    else if (!compareSignaturesIdentical(signatureList[0], signature, false, true, true, compareTypesIdentical)) {
+                    else if (!compareSignaturesIdentical(signatureList[0], signature, /*partialMatch*/ false, /*ignoreThisTypes*/ true, /*ignoreReturnTypes*/ true, compareTypesIdentical)) {
+                        // Signatures aren't identical, do not use
                         return undefined;
                     }
                     else {
+                        // Use this signature for contextual union signature
                         signatureList.push(signature);
                     }
                 }
             }
+            // Result is union of signatures collected (return type is union of return types of this signature set)
             var result;
             if (signatureList) {
                 result = cloneSignature(signatureList[0]);
@@ -34078,15 +43549,15 @@ var ts;
             return result;
         }
         function checkSpreadExpression(node, checkMode) {
-            if (languageVersion < 2 && compilerOptions.downlevelIteration) {
-                checkExternalEmitHelpers(node, 1536);
+            if (languageVersion < 2 /* ES2015 */ && compilerOptions.downlevelIteration) {
+                checkExternalEmitHelpers(node, 1536 /* SpreadIncludes */);
             }
             var arrayOrIterableType = checkExpression(node.expression, checkMode);
-            return checkIteratedTypeOrElementType(arrayOrIterableType, node.expression, false, false);
+            return checkIteratedTypeOrElementType(arrayOrIterableType, node.expression, /*allowStringInput*/ false, /*allowAsyncIterables*/ false);
         }
         function hasDefaultValue(node) {
-            return (node.kind === 182 && !!node.initializer) ||
-                (node.kind === 200 && node.operatorToken.kind === 58);
+            return (node.kind === 182 /* BindingElement */ && !!node.initializer) ||
+                (node.kind === 200 /* BinaryExpression */ && node.operatorToken.kind === 58 /* EqualsToken */);
         }
         function checkArrayLiteral(node, checkMode) {
             var elements = node.elements;
@@ -34096,10 +43567,22 @@ var ts;
             var contextualType = getApparentTypeOfContextualType(node);
             for (var index = 0; index < elements.length; index++) {
                 var e = elements[index];
-                if (inDestructuringPattern && e.kind === 204) {
+                if (inDestructuringPattern && e.kind === 204 /* SpreadElement */) {
+                    // Given the following situation:
+                    //    var c: {};
+                    //    [...c] = ["", 0];
+                    //
+                    // c is represented in the tree as a spread element in an array literal.
+                    // But c really functions as a rest element, and its purpose is to provide
+                    // a contextual type for the right hand side of the assignment. Therefore,
+                    // instead of calling checkExpression on "...c", which will give an error
+                    // if c is not iterable/array-like, we need to act as if we are trying to
+                    // get the contextual element type from it. So we do something similar to
+                    // getContextualTypeForElementExpression, which will crucially not error
+                    // if there is no index type / iterated type.
                     var restArrayType = checkExpression(e.expression, checkMode);
-                    var restElementType = getIndexTypeOfType(restArrayType, 1) ||
-                        getIteratedTypeOrElementType(restArrayType, undefined, false, false, false);
+                    var restElementType = getIndexTypeOfType(restArrayType, 1 /* Number */) ||
+                        getIteratedTypeOrElementType(restArrayType, /*errorNode*/ undefined, /*allowStringInput*/ false, /*allowAsyncIterables*/ false, /*checkAssignability*/ false);
                     if (restElementType) {
                         elementTypes.push(restElementType);
                     }
@@ -34109,9 +43592,11 @@ var ts;
                     var type = checkExpressionForMutableLocation(e, checkMode, elementContextualType);
                     elementTypes.push(type);
                 }
-                hasSpreadElement = hasSpreadElement || e.kind === 204;
+                hasSpreadElement = hasSpreadElement || e.kind === 204 /* SpreadElement */;
             }
             if (!hasSpreadElement) {
+                // If array literal is actually a destructuring pattern, mark it as an implied type. We do this such
+                // that we get the same behavior for "var [x, y] = []" and "[x, y] = []".
                 if (inDestructuringPattern && elementTypes.length) {
                     var type = cloneTypeReference(createTupleType(elementTypes));
                     type.pattern = node;
@@ -34119,7 +43604,9 @@ var ts;
                 }
                 if (contextualType && contextualTypeIsTupleLikeType(contextualType)) {
                     var pattern = contextualType.pattern;
-                    if (pattern && (pattern.kind === 181 || pattern.kind === 183)) {
+                    // If array literal is contextually typed by a binding pattern or an assignment pattern, pad the resulting
+                    // tuple type with the corresponding binding or assignment element types to make the lengths equal.
+                    if (pattern && (pattern.kind === 181 /* ArrayBindingPattern */ || pattern.kind === 183 /* ArrayLiteralExpression */)) {
                         var patternElements = pattern.elements;
                         for (var i = elementTypes.length; i < patternElements.length; i++) {
                             var patternElement = patternElements[i];
@@ -34127,7 +43614,7 @@ var ts;
                                 elementTypes.push(contextualType.typeArguments[i]);
                             }
                             else {
-                                if (patternElement.kind !== 206) {
+                                if (patternElement.kind !== 206 /* OmittedExpression */) {
                                     error(patternElement, ts.Diagnostics.Initializer_provides_no_value_for_this_binding_element_and_the_binding_element_has_no_default_value);
                                 }
                                 elementTypes.push(strictNullChecks ? implicitNeverType : undefinedWideningType);
@@ -34140,42 +43627,67 @@ var ts;
                 }
             }
             return createArrayType(elementTypes.length ?
-                getUnionType(elementTypes, 2) :
+                getUnionType(elementTypes, 2 /* Subtype */) :
                 strictNullChecks ? implicitNeverType : undefinedWideningType);
         }
         function isNumericName(name) {
             switch (name.kind) {
-                case 147:
+                case 147 /* ComputedPropertyName */:
                     return isNumericComputedName(name);
-                case 71:
+                case 71 /* Identifier */:
                     return isNumericLiteralName(name.escapedText);
-                case 8:
-                case 9:
+                case 8 /* NumericLiteral */:
+                case 9 /* StringLiteral */:
                     return isNumericLiteralName(name.text);
                 default:
                     return false;
             }
         }
         function isNumericComputedName(name) {
-            return isTypeAssignableToKind(checkComputedPropertyName(name), 168);
+            // It seems odd to consider an expression of type Any to result in a numeric name,
+            // but this behavior is consistent with checkIndexedAccess
+            return isTypeAssignableToKind(checkComputedPropertyName(name), 168 /* NumberLike */);
         }
         function isInfinityOrNaNString(name) {
             return name === "Infinity" || name === "-Infinity" || name === "NaN";
         }
         function isNumericLiteralName(name) {
+            // The intent of numeric names is that
+            //     - they are names with text in a numeric form, and that
+            //     - setting properties/indexing with them is always equivalent to doing so with the numeric literal 'numLit',
+            //         acquired by applying the abstract 'ToNumber' operation on the name's text.
+            //
+            // The subtlety is in the latter portion, as we cannot reliably say that anything that looks like a numeric literal is a numeric name.
+            // In fact, it is the case that the text of the name must be equal to 'ToString(numLit)' for this to hold.
+            //
+            // Consider the property name '"0xF00D"'. When one indexes with '0xF00D', they are actually indexing with the value of 'ToString(0xF00D)'
+            // according to the ECMAScript specification, so it is actually as if the user indexed with the string '"61453"'.
+            // Thus, the text of all numeric literals equivalent to '61543' such as '0xF00D', '0xf00D', '0170015', etc. are not valid numeric names
+            // because their 'ToString' representation is not equal to their original text.
+            // This is motivated by ECMA-262 sections 9.3.1, 9.8.1, 11.1.5, and 11.2.1.
+            //
+            // Here, we test whether 'ToString(ToNumber(name))' is exactly equal to 'name'.
+            // The '+' prefix operator is equivalent here to applying the abstract ToNumber operation.
+            // Applying the 'toString()' method on a number gives us the abstract ToString operation on a number.
+            //
+            // Note that this accepts the values 'Infinity', '-Infinity', and 'NaN', and that this is intentional.
+            // This is desired behavior, because when indexing with them as numeric entities, you are indexing
+            // with the strings '"Infinity"', '"-Infinity"', and '"NaN"' respectively.
             return (+name).toString() === name;
         }
         function checkComputedPropertyName(node) {
             var links = getNodeLinks(node.expression);
             if (!links.resolvedType) {
                 links.resolvedType = checkExpression(node.expression);
-                if (links.resolvedType.flags & 24576 ||
-                    !isTypeAssignableToKind(links.resolvedType, 68 | 168 | 3072) &&
+                // This will allow types number, string, symbol or any. It will also allow enums, the unknown
+                // type, and any union of these types (like string | number).
+                if (links.resolvedType.flags & 24576 /* Nullable */ ||
+                    !isTypeAssignableToKind(links.resolvedType, 68 /* StringLike */ | 168 /* NumberLike */ | 3072 /* ESSymbolLike */) &&
                         !isTypeAssignableTo(links.resolvedType, stringNumberSymbolType)) {
                     error(node, ts.Diagnostics.A_computed_property_name_must_be_of_type_string_number_symbol_or_any);
                 }
                 else {
-                    checkThatExpressionIsProperSymbolReference(node.expression, links.resolvedType, true);
+                    checkThatExpressionIsProperSymbolReference(node.expression, links.resolvedType, /*reportError*/ true);
                 }
             }
             return links.resolvedType;
@@ -34183,23 +43695,24 @@ var ts;
         function getObjectLiteralIndexInfo(propertyNodes, offset, properties, kind) {
             var propTypes = [];
             for (var i = 0; i < properties.length; i++) {
-                if (kind === 0 || isNumericName(propertyNodes[i + offset].name)) {
+                if (kind === 0 /* String */ || isNumericName(propertyNodes[i + offset].name)) {
                     propTypes.push(getTypeOfSymbol(properties[i]));
                 }
             }
-            var unionType = propTypes.length ? getUnionType(propTypes, 2) : undefinedType;
-            return createIndexInfo(unionType, false);
+            var unionType = propTypes.length ? getUnionType(propTypes, 2 /* Subtype */) : undefinedType;
+            return createIndexInfo(unionType, /*isReadonly*/ false);
         }
         function checkObjectLiteral(node, checkMode) {
             var inDestructuringPattern = ts.isAssignmentTarget(node);
+            // Grammar checking
             checkGrammarObjectLiteralExpression(node, inDestructuringPattern);
             var propertiesTable;
             var propertiesArray = [];
             var spread = emptyObjectType;
-            var propagatedFlags = 33554432;
+            var propagatedFlags = 33554432 /* FreshLiteral */;
             var contextualType = getApparentTypeOfContextualType(node);
             var contextualTypeHasPattern = contextualType && contextualType.pattern &&
-                (contextualType.pattern.kind === 180 || contextualType.pattern.kind === 184);
+                (contextualType.pattern.kind === 180 /* ObjectBindingPattern */ || contextualType.pattern.kind === 184 /* ObjectLiteralExpression */);
             var isInJSFile = ts.isInJavaScriptFile(node) && !ts.isInJsonFile(node);
             var isJSObjectLiteral = !contextualType && isInJSFile;
             var typeFlags = 0;
@@ -34209,10 +43722,11 @@ var ts;
             if (isInJSFile) {
                 var decl = ts.getDeclarationOfJSInitializer(node);
                 if (decl) {
-                    var symbol = getMergedSymbol(decl.symbol);
+                    // a JS object literal whose declaration's symbol has exports is a JS namespace
+                    var symbol = getSymbolOfNode(decl);
                     if (symbol && ts.hasEntries(symbol.exports)) {
                         propertiesTable = symbol.exports;
-                        symbol.exports.forEach(function (symbol) { return propertiesArray.push(getMergedSymbol(symbol)); });
+                        symbol.exports.forEach(function (s) { return propertiesArray.push(getMergedSymbol(s)); });
                         return createObjectLiteralType();
                     }
                 }
@@ -34222,13 +43736,13 @@ var ts;
             for (var i = 0; i < node.properties.length; i++) {
                 var memberDecl = node.properties[i];
                 var member = getSymbolOfNode(memberDecl);
-                var computedNameType = memberDecl.name && memberDecl.name.kind === 147 && !ts.isWellKnownSymbolSyntactically(memberDecl.name.expression) ?
+                var computedNameType = memberDecl.name && memberDecl.name.kind === 147 /* ComputedPropertyName */ && !ts.isWellKnownSymbolSyntactically(memberDecl.name.expression) ?
                     checkComputedPropertyName(memberDecl.name) : undefined;
-                if (memberDecl.kind === 270 ||
-                    memberDecl.kind === 271 ||
+                if (memberDecl.kind === 270 /* PropertyAssignment */ ||
+                    memberDecl.kind === 271 /* ShorthandPropertyAssignment */ ||
                     ts.isObjectLiteralMethod(memberDecl)) {
-                    var type = memberDecl.kind === 270 ? checkPropertyAssignment(memberDecl, checkMode) :
-                        memberDecl.kind === 271 ? checkExpressionForMutableLocation(memberDecl.name, checkMode) :
+                    var type = memberDecl.kind === 270 /* PropertyAssignment */ ? checkPropertyAssignment(memberDecl, checkMode) :
+                        memberDecl.kind === 271 /* ShorthandPropertyAssignment */ ? checkExpressionForMutableLocation(memberDecl.name, checkMode) :
                             checkObjectLiteralMethod(memberDecl, checkMode);
                     if (isInJSFile) {
                         var jsDocType = getTypeForDeclarationFromJSDocComment(memberDecl);
@@ -34238,27 +43752,31 @@ var ts;
                         }
                     }
                     typeFlags |= type.flags;
-                    var nameType = computedNameType && computedNameType.flags & 2240 ?
+                    var nameType = computedNameType && computedNameType.flags & 2240 /* StringOrNumberLiteralOrUnique */ ?
                         computedNameType : undefined;
                     var prop = nameType ?
-                        createSymbol(4 | member.flags, getLateBoundNameFromType(nameType), 1024) :
-                        createSymbol(4 | member.flags, member.escapedName);
+                        createSymbol(4 /* Property */ | member.flags, getLateBoundNameFromType(nameType), 1024 /* Late */) :
+                        createSymbol(4 /* Property */ | member.flags, member.escapedName);
                     if (nameType) {
                         prop.nameType = nameType;
                     }
                     if (inDestructuringPattern) {
-                        var isOptional = (memberDecl.kind === 270 && hasDefaultValue(memberDecl.initializer)) ||
-                            (memberDecl.kind === 271 && memberDecl.objectAssignmentInitializer);
+                        // If object literal is an assignment pattern and if the assignment pattern specifies a default value
+                        // for the property, make the property optional.
+                        var isOptional = (memberDecl.kind === 270 /* PropertyAssignment */ && hasDefaultValue(memberDecl.initializer)) ||
+                            (memberDecl.kind === 271 /* ShorthandPropertyAssignment */ && memberDecl.objectAssignmentInitializer);
                         if (isOptional) {
-                            prop.flags |= 16777216;
+                            prop.flags |= 16777216 /* Optional */;
                         }
                     }
-                    else if (contextualTypeHasPattern && !(ts.getObjectFlags(contextualType) & 512)) {
+                    else if (contextualTypeHasPattern && !(ts.getObjectFlags(contextualType) & 512 /* ObjectLiteralPatternWithComputedProperties */)) {
+                        // If object literal is contextually typed by the implied type of a binding pattern, and if the
+                        // binding pattern specifies a default value for the property, make the property optional.
                         var impliedProp = getPropertyOfType(contextualType, member.escapedName);
                         if (impliedProp) {
-                            prop.flags |= impliedProp.flags & 16777216;
+                            prop.flags |= impliedProp.flags & 16777216 /* Optional */;
                         }
-                        else if (!compilerOptions.suppressExcessPropertyErrors && !getIndexInfoOfType(contextualType, 0)) {
+                        else if (!compilerOptions.suppressExcessPropertyErrors && !getIndexInfoOfType(contextualType, 0 /* String */)) {
                             error(memberDecl.name, ts.Diagnostics.Object_literal_may_only_specify_known_properties_and_0_does_not_exist_in_type_1, symbolToString(member), typeToString(contextualType));
                         }
                     }
@@ -34271,12 +43789,12 @@ var ts;
                     prop.target = member;
                     member = prop;
                 }
-                else if (memberDecl.kind === 272) {
-                    if (languageVersion < 2) {
-                        checkExternalEmitHelpers(memberDecl, 2);
+                else if (memberDecl.kind === 272 /* SpreadAssignment */) {
+                    if (languageVersion < 2 /* ES2015 */) {
+                        checkExternalEmitHelpers(memberDecl, 2 /* Assign */);
                     }
                     if (propertiesArray.length > 0) {
-                        spread = getSpreadType(spread, createObjectLiteralType(), node.symbol, propagatedFlags, 0);
+                        spread = getSpreadType(spread, createObjectLiteralType(), node.symbol, propagatedFlags, /*objectFlags*/ 0);
                         propertiesArray = [];
                         propertiesTable = ts.createSymbolTable();
                         hasComputedStringProperty = false;
@@ -34288,15 +43806,20 @@ var ts;
                         error(memberDecl, ts.Diagnostics.Spread_types_may_only_be_created_from_object_types);
                         return errorType;
                     }
-                    spread = getSpreadType(spread, type, node.symbol, propagatedFlags, 0);
+                    spread = getSpreadType(spread, type, node.symbol, propagatedFlags, /*objectFlags*/ 0);
                     offset = i + 1;
                     continue;
                 }
                 else {
-                    ts.Debug.assert(memberDecl.kind === 156 || memberDecl.kind === 157);
+                    // TypeScript 1.0 spec (April 2014)
+                    // A get accessor declaration is processed in the same manner as
+                    // an ordinary function declaration(section 6.1) with no parameters.
+                    // A set accessor declaration is processed in the same manner
+                    // as an ordinary function declaration with a single parameter and a Void return type.
+                    ts.Debug.assert(memberDecl.kind === 156 /* GetAccessor */ || memberDecl.kind === 157 /* SetAccessor */);
                     checkNodeDeferred(memberDecl);
                 }
-                if (computedNameType && !(computedNameType.flags & 2240)) {
+                if (computedNameType && !(computedNameType.flags & 2240 /* StringOrNumberLiteralOrUnique */)) {
                     if (isTypeAssignableTo(computedNameType, stringNumberSymbolType)) {
                         if (isTypeAssignableTo(computedNameType, numberType)) {
                             hasComputedNumberProperty = true;
@@ -34314,11 +43837,13 @@ var ts;
                 }
                 propertiesArray.push(member);
             }
+            // If object literal is contextually typed by the implied type of a binding pattern, augment the result
+            // type with those properties for which the binding pattern specifies a default value.
             if (contextualTypeHasPattern) {
                 for (var _i = 0, _a = getPropertiesOfType(contextualType); _i < _a.length; _i++) {
                     var prop = _a[_i];
                     if (!propertiesTable.get(prop.escapedName) && !(spread && getPropertyOfType(spread, prop.escapedName))) {
-                        if (!(prop.flags & 16777216)) {
+                        if (!(prop.flags & 16777216 /* Optional */)) {
                             error(prop.valueDeclaration || prop.bindingElement, ts.Diagnostics.Initializer_provides_no_value_for_this_binding_element_and_the_binding_element_has_no_default_value);
                         }
                         propertiesTable.set(prop.escapedName, prop);
@@ -34328,42 +43853,44 @@ var ts;
             }
             if (spread !== emptyObjectType) {
                 if (propertiesArray.length > 0) {
-                    spread = getSpreadType(spread, createObjectLiteralType(), node.symbol, propagatedFlags, 0);
+                    spread = getSpreadType(spread, createObjectLiteralType(), node.symbol, propagatedFlags, /*objectFlags*/ 0);
                 }
                 return spread;
             }
             return createObjectLiteralType();
             function createObjectLiteralType() {
-                var stringIndexInfo = isJSObjectLiteral ? jsObjectLiteralIndexInfo : hasComputedStringProperty ? getObjectLiteralIndexInfo(node.properties, offset, propertiesArray, 0) : undefined;
-                var numberIndexInfo = hasComputedNumberProperty && !isJSObjectLiteral ? getObjectLiteralIndexInfo(node.properties, offset, propertiesArray, 1) : undefined;
+                var stringIndexInfo = isJSObjectLiteral ? jsObjectLiteralIndexInfo : hasComputedStringProperty ? getObjectLiteralIndexInfo(node.properties, offset, propertiesArray, 0 /* String */) : undefined;
+                var numberIndexInfo = hasComputedNumberProperty && !isJSObjectLiteral ? getObjectLiteralIndexInfo(node.properties, offset, propertiesArray, 1 /* Number */) : undefined;
                 var result = createAnonymousType(node.symbol, propertiesTable, ts.emptyArray, ts.emptyArray, stringIndexInfo, numberIndexInfo);
-                var freshObjectLiteralFlag = compilerOptions.suppressExcessPropertyErrors ? 0 : 33554432;
-                result.flags |= 268435456 | freshObjectLiteralFlag | (typeFlags & 939524096);
-                result.objectFlags |= 128;
+                var freshObjectLiteralFlag = compilerOptions.suppressExcessPropertyErrors ? 0 : 33554432 /* FreshLiteral */;
+                result.flags |= 268435456 /* ContainsObjectLiteral */ | freshObjectLiteralFlag | (typeFlags & 939524096 /* PropagatingFlags */);
+                result.objectFlags |= 128 /* ObjectLiteral */;
                 if (patternWithComputedProperties) {
-                    result.objectFlags |= 512;
+                    result.objectFlags |= 512 /* ObjectLiteralPatternWithComputedProperties */;
                 }
                 if (inDestructuringPattern) {
                     result.pattern = node;
                 }
-                if (!(result.flags & 24576)) {
-                    propagatedFlags |= (result.flags & 939524096);
+                if (!(result.flags & 24576 /* Nullable */)) {
+                    propagatedFlags |= (result.flags & 939524096 /* PropagatingFlags */);
                 }
                 return result;
             }
         }
         function isValidSpreadType(type) {
-            return !!(type.flags & (3 | 16777216) ||
-                getFalsyFlags(type) & 29120 && isValidSpreadType(removeDefinitelyFalsyTypes(type)) ||
-                type.flags & 131072 && !isGenericMappedType(type) ||
-                type.flags & 786432 && !ts.forEach(type.types, function (t) { return !isValidSpreadType(t); }));
+            return !!(type.flags & (3 /* AnyOrUnknown */ | 16777216 /* NonPrimitive */) ||
+                getFalsyFlags(type) & 29120 /* DefinitelyFalsy */ && isValidSpreadType(removeDefinitelyFalsyTypes(type)) ||
+                type.flags & 131072 /* Object */ && !isGenericMappedType(type) ||
+                type.flags & 786432 /* UnionOrIntersection */ && ts.every(type.types, isValidSpreadType));
         }
         function checkJsxSelfClosingElement(node, checkMode) {
             checkJsxOpeningLikeElementOrOpeningFragment(node, checkMode);
             return getJsxElementTypeAt(node) || anyType;
         }
         function checkJsxElement(node, checkMode) {
+            // Check attributes
             checkJsxOpeningLikeElementOrOpeningFragment(node.openingElement, checkMode);
+            // Perform resolution on the closing tag so that rename/go to definition/etc work
             if (isJsxIntrinsicIdentifier(node.closingElement.tagName)) {
                 getIntrinsicTagSymbol(node.closingElement);
             }
@@ -34374,22 +43901,30 @@ var ts;
         }
         function checkJsxFragment(node, checkMode) {
             checkJsxOpeningLikeElementOrOpeningFragment(node.openingFragment, checkMode);
-            if (compilerOptions.jsx === 2 && (compilerOptions.jsxFactory || ts.getSourceFileOfNode(node).pragmas.has("jsx"))) {
+            if (compilerOptions.jsx === 2 /* React */ && (compilerOptions.jsxFactory || ts.getSourceFileOfNode(node).pragmas.has("jsx"))) {
                 error(node, compilerOptions.jsxFactory
                     ? ts.Diagnostics.JSX_fragment_is_not_supported_when_using_jsxFactory
                     : ts.Diagnostics.JSX_fragment_is_not_supported_when_using_an_inline_JSX_factory_pragma);
             }
             return getJsxElementTypeAt(node) || anyType;
         }
+        /**
+         * Returns true iff the JSX element name would be a valid JS identifier, ignoring restrictions about keywords not being identifiers
+         */
         function isUnhyphenatedJsxName(name) {
+            // - is the only character supported in JSX attribute names that isn't valid in JavaScript identifiers
             return !ts.stringContains(name, "-");
         }
+        /**
+         * Returns true iff React would emit this tag name as a string rather than an identifier or qualified name
+         */
         function isJsxIntrinsicIdentifier(tagName) {
+            // TODO (yuisu): comment
             switch (tagName.kind) {
-                case 185:
-                case 99:
+                case 185 /* PropertyAccessExpression */:
+                case 99 /* ThisKeyword */:
                     return false;
-                case 71:
+                case 71 /* Identifier */:
                     return ts.isIntrinsicJsxName(tagName.escapedText);
                 default:
                     return ts.Debug.fail();
@@ -34398,8 +43933,17 @@ var ts;
         function checkJsxAttribute(node, checkMode) {
             return node.initializer
                 ? checkExpressionForMutableLocation(node.initializer, checkMode)
-                : trueType;
+                : trueType; // <Elem attr /> is sugar for <Elem attr={true} />
         }
+        /**
+         * Get attributes type of the JSX opening-like element. The result is from resolving "attributes" property of the opening-like element.
+         *
+         * @param openingLikeElement a JSX opening-like element
+         * @param filter a function to remove attributes that will not participate in checking whether attributes are assignable
+         * @return an anonymous type (similar to the one returned by checkObjectLiteral) in which its properties are attributes property.
+         * @remarks Because this function calls getSpreadType, it needs to use the same checks as checkObjectLiteral,
+         * which also calls getSpreadType.
+         */
         function createJsxAttributesTypeFromAttributesProperty(openingLikeElement, checkMode) {
             var attributes = openingLikeElement.attributes;
             var attributesTable = ts.createSymbolTable();
@@ -34413,7 +43957,7 @@ var ts;
                 var member = attributeDecl.symbol;
                 if (ts.isJsxAttribute(attributeDecl)) {
                     var exprType = checkJsxAttribute(attributeDecl, checkMode);
-                    var attributeSymbol = createSymbol(4 | 33554432 | member.flags, member.escapedName);
+                    var attributeSymbol = createSymbol(4 /* Property */ | 33554432 /* Transient */ | member.flags, member.escapedName);
                     attributeSymbol.declarations = member.declarations;
                     attributeSymbol.parent = member.parent;
                     if (member.valueDeclaration) {
@@ -34427,9 +43971,9 @@ var ts;
                     }
                 }
                 else {
-                    ts.Debug.assert(attributeDecl.kind === 264);
+                    ts.Debug.assert(attributeDecl.kind === 264 /* JsxSpreadAttribute */);
                     if (attributesTable.size > 0) {
-                        spread = getSpreadType(spread, createJsxAttributesType(), attributes.symbol, 0, 4096);
+                        spread = getSpreadType(spread, createJsxAttributesType(), attributes.symbol, /*typeFlags*/ 0, 4096 /* JsxAttributes */);
                         attributesTable = ts.createSymbolTable();
                     }
                     var exprType = checkExpressionCached(attributeDecl.expression, checkMode);
@@ -34437,7 +43981,7 @@ var ts;
                         hasSpreadAnyType = true;
                     }
                     if (isValidSpreadType(exprType)) {
-                        spread = getSpreadType(spread, exprType, openingLikeElement.symbol, 0, 4096);
+                        spread = getSpreadType(spread, exprType, openingLikeElement.symbol, /*typeFlags*/ 0, 4096 /* JsxAttributes */);
                     }
                     else {
                         typeToIntersect = typeToIntersect ? getIntersectionType([typeToIntersect, exprType]) : exprType;
@@ -34446,23 +43990,29 @@ var ts;
             }
             if (!hasSpreadAnyType) {
                 if (attributesTable.size > 0) {
-                    spread = getSpreadType(spread, createJsxAttributesType(), attributes.symbol, 0, 4096);
+                    spread = getSpreadType(spread, createJsxAttributesType(), attributes.symbol, /*typeFlags*/ 0, 4096 /* JsxAttributes */);
                 }
             }
-            var parent = openingLikeElement.parent.kind === 255 ? openingLikeElement.parent : undefined;
+            // Handle children attribute
+            var parent = openingLikeElement.parent.kind === 255 /* JsxElement */ ? openingLikeElement.parent : undefined;
+            // We have to check that openingElement of the parent is the one we are visiting as this may not be true for selfClosingElement
             if (parent && parent.openingElement === openingLikeElement && parent.children.length > 0) {
                 var childrenTypes = checkJsxChildren(parent, checkMode);
                 if (!hasSpreadAnyType && jsxChildrenPropertyName && jsxChildrenPropertyName !== "") {
+                    // Error if there is a attribute named "children" explicitly specified and children element.
+                    // This is because children element will overwrite the value from attributes.
+                    // Note: we will not warn "children" attribute overwritten if "children" attribute is specified in object spread.
                     if (explicitlySpecifyChildrenAttribute) {
                         error(attributes, ts.Diagnostics._0_are_specified_twice_The_attribute_named_0_will_be_overwritten, ts.unescapeLeadingUnderscores(jsxChildrenPropertyName));
                     }
-                    var childrenPropSymbol = createSymbol(4 | 33554432, jsxChildrenPropertyName);
+                    // If there are children in the body of JSX element, create dummy attribute "children" with the union of children types so that it will pass the attribute checking process
+                    var childrenPropSymbol = createSymbol(4 /* Property */ | 33554432 /* Transient */, jsxChildrenPropertyName);
                     childrenPropSymbol.type = childrenTypes.length === 1 ?
                         childrenTypes[0] :
                         createArrayType(getUnionType(childrenTypes));
                     var childPropMap = ts.createSymbolTable();
                     childPropMap.set(jsxChildrenPropertyName, childrenPropSymbol);
-                    spread = getSpreadType(spread, createAnonymousType(attributes.symbol, childPropMap, ts.emptyArray, ts.emptyArray, undefined, undefined), attributes.symbol, 0, 4096);
+                    spread = getSpreadType(spread, createAnonymousType(attributes.symbol, childPropMap, ts.emptyArray, ts.emptyArray, /*stringIndexInfo*/ undefined, /*numberIndexInfo*/ undefined), attributes.symbol, /*typeFlags*/ 0, 4096 /* JsxAttributes */);
                 }
             }
             if (hasSpreadAnyType) {
@@ -34472,10 +44022,15 @@ var ts;
                 return getIntersectionType([typeToIntersect, spread]);
             }
             return typeToIntersect || (spread === emptyObjectType ? createJsxAttributesType() : spread);
+            /**
+             * Create anonymous type from given attributes symbol table.
+             * @param symbol a symbol of JsxAttributes containing attributes corresponding to attributesTable
+             * @param attributesTable a symbol table of attributes property
+             */
             function createJsxAttributesType() {
-                var result = createAnonymousType(attributes.symbol, attributesTable, ts.emptyArray, ts.emptyArray, undefined, undefined);
-                result.flags |= 268435456;
-                result.objectFlags |= 128 | 4096;
+                var result = createAnonymousType(attributes.symbol, attributesTable, ts.emptyArray, ts.emptyArray, /*stringIndexInfo*/ undefined, /*numberIndexInfo*/ undefined);
+                result.flags |= 268435456 /* ContainsObjectLiteral */;
+                result.objectFlags |= 128 /* ObjectLiteral */ | 4096 /* JsxAttributes */;
                 return result;
             }
         }
@@ -34483,7 +44038,9 @@ var ts;
             var childrenTypes = [];
             for (var _i = 0, _a = node.children; _i < _a.length; _i++) {
                 var child = _a[_i];
-                if (child.kind === 10) {
+                // In React, JSX text that contains only whitespaces will be ignored so we don't want to type-check that
+                // because then type of children property will have constituent of string type.
+                if (child.kind === 10 /* JsxText */) {
                     if (!child.containsOnlyWhiteSpaces) {
                         childrenTypes.push(stringType);
                     }
@@ -34494,32 +44051,46 @@ var ts;
             }
             return childrenTypes;
         }
+        /**
+         * Check attributes property of opening-like element. This function is called during chooseOverload to get call signature of a JSX opening-like element.
+         * (See "checkApplicableSignatureForJsxOpeningLikeElement" for how the function is used)
+         * @param node a JSXAttributes to be resolved of its type
+         */
         function checkJsxAttributes(node, checkMode) {
             return createJsxAttributesTypeFromAttributesProperty(node.parent, checkMode);
         }
         function getJsxType(name, location) {
             var namespace = getJsxNamespaceAt(location);
             var exports = namespace && getExportsOfSymbol(namespace);
-            var typeSymbol = exports && getSymbol(exports, name, 67901928);
+            var typeSymbol = exports && getSymbol(exports, name, 67901928 /* Type */);
             return typeSymbol ? getDeclaredTypeOfSymbol(typeSymbol) : errorType;
         }
+        /**
+         * Looks up an intrinsic tag name and returns a symbol that either points to an intrinsic
+         * property (in which case nodeLinks.jsxFlags will be IntrinsicNamedElement) or an intrinsic
+         * string index signature (in which case nodeLinks.jsxFlags will be IntrinsicIndexedElement).
+         * May also return unknownSymbol if both of these lookups fail.
+         */
         function getIntrinsicTagSymbol(node) {
             var links = getNodeLinks(node);
             if (!links.resolvedSymbol) {
                 var intrinsicElementsType = getJsxType(JsxNames.IntrinsicElements, node);
                 if (intrinsicElementsType !== errorType) {
+                    // Property case
                     if (!ts.isIdentifier(node.tagName))
                         return ts.Debug.fail();
                     var intrinsicProp = getPropertyOfType(intrinsicElementsType, node.tagName.escapedText);
                     if (intrinsicProp) {
-                        links.jsxFlags |= 1;
+                        links.jsxFlags |= 1 /* IntrinsicNamedElement */;
                         return links.resolvedSymbol = intrinsicProp;
                     }
-                    var indexSignatureType = getIndexTypeOfType(intrinsicElementsType, 0);
+                    // Intrinsic string indexer case
+                    var indexSignatureType = getIndexTypeOfType(intrinsicElementsType, 0 /* String */);
                     if (indexSignatureType) {
-                        links.jsxFlags |= 2;
+                        links.jsxFlags |= 2 /* IntrinsicIndexedElement */;
                         return links.resolvedSymbol = intrinsicElementsType.symbol;
                     }
+                    // Wasn't found
                     error(node, ts.Diagnostics.Property_0_does_not_exist_on_type_1, ts.idText(node.tagName), "JSX." + JsxNames.IntrinsicElements);
                     return links.resolvedSymbol = unknownSymbol;
                 }
@@ -34540,7 +44111,7 @@ var ts;
                 var signature = signatures_3[_i];
                 if (signature.typeParameters) {
                     var isJavascript = ts.isInJavaScriptFile(node);
-                    var typeArgumentInstantiated = getJsxSignatureTypeArgumentInstantiation(signature, node, isJavascript, false);
+                    var typeArgumentInstantiated = getJsxSignatureTypeArgumentInstantiation(signature, node, isJavascript, /*reportErrors*/ false);
                     if (typeArgumentInstantiated) {
                         hasTypeArgumentError = false;
                         instantiatedSignatures.push(typeArgumentInstantiated);
@@ -34549,7 +44120,7 @@ var ts;
                         if (node.typeArguments && hasCorrectTypeArgumentArity(signature, node.typeArguments)) {
                             candidateForTypeArgumentError = signature;
                         }
-                        var inferenceContext = createInferenceContext(signature.typeParameters, signature, isJavascript ? 4 : 0);
+                        var inferenceContext = createInferenceContext(signature.typeParameters, signature, /*flags*/ isJavascript ? 4 /* AnyDefault */ : 0 /* None */);
                         var typeArguments = inferJsxTypeArguments(signature, node, inferenceContext);
                         instantiatedSignatures.push(getSignatureInstantiation(signature, typeArguments, isJavascript));
                     }
@@ -34560,8 +44131,9 @@ var ts;
             }
             if (node.typeArguments && hasTypeArgumentError) {
                 if (candidateForTypeArgumentError) {
-                    checkTypeArguments(candidateForTypeArgumentError, node.typeArguments, true);
+                    checkTypeArguments(candidateForTypeArgumentError, node.typeArguments, /*reportErrors*/ true);
                 }
+                // Length check to avoid issuing an arity error on length=0, the "Type argument list cannot be empty" grammar error alone is fine
                 else if (node.typeArguments.length !== 0) {
                     diagnostics.add(getTypeArgumentArityError(node, signatures, node.typeArguments));
                 }
@@ -34584,32 +44156,52 @@ var ts;
         }
         function getJsxNamespaceAt(location) {
             var namespaceName = getJsxNamespace(location);
-            var resolvedNamespace = resolveName(location, namespaceName, 1920, undefined, namespaceName, false);
+            var resolvedNamespace = resolveName(location, namespaceName, 1920 /* Namespace */, /*diagnosticMessage*/ undefined, namespaceName, /*isUse*/ false);
             if (resolvedNamespace) {
-                var candidate = getSymbol(getExportsOfSymbol(resolveSymbol(resolvedNamespace)), JsxNames.JSX, 1920);
+                var candidate = getSymbol(getExportsOfSymbol(resolveSymbol(resolvedNamespace)), JsxNames.JSX, 1920 /* Namespace */);
                 if (candidate) {
                     return candidate;
                 }
             }
-            return getGlobalSymbol(JsxNames.JSX, 1920, undefined);
+            // JSX global fallback
+            return getGlobalSymbol(JsxNames.JSX, 1920 /* Namespace */, /*diagnosticMessage*/ undefined); // TODO: GH#18217
         }
+        /**
+         * Look into JSX namespace and then look for container with matching name as nameOfAttribPropContainer.
+         * Get a single property from that container if existed. Report an error if there are more than one property.
+         *
+         * @param nameOfAttribPropContainer a string of value JsxNames.ElementAttributesPropertyNameContainer or JsxNames.ElementChildrenAttributeNameContainer
+         *          if other string is given or the container doesn't exist, return undefined.
+         */
         function getNameFromJsxElementAttributesContainer(nameOfAttribPropContainer, jsxNamespace) {
-            var jsxElementAttribPropInterfaceSym = jsxNamespace && getSymbol(jsxNamespace.exports, nameOfAttribPropContainer, 67901928);
+            // JSX.ElementAttributesProperty | JSX.ElementChildrenAttribute [symbol]
+            var jsxElementAttribPropInterfaceSym = jsxNamespace && getSymbol(jsxNamespace.exports, nameOfAttribPropContainer, 67901928 /* Type */);
+            // JSX.ElementAttributesProperty | JSX.ElementChildrenAttribute [type]
             var jsxElementAttribPropInterfaceType = jsxElementAttribPropInterfaceSym && getDeclaredTypeOfSymbol(jsxElementAttribPropInterfaceSym);
+            // The properties of JSX.ElementAttributesProperty | JSX.ElementChildrenAttribute
             var propertiesOfJsxElementAttribPropInterface = jsxElementAttribPropInterfaceType && getPropertiesOfType(jsxElementAttribPropInterfaceType);
             if (propertiesOfJsxElementAttribPropInterface) {
+                // Element Attributes has zero properties, so the element attributes type will be the class instance type
                 if (propertiesOfJsxElementAttribPropInterface.length === 0) {
                     return "";
                 }
+                // Element Attributes has one property, so the element attributes type will be the type of the corresponding
+                // property of the class instance type
                 else if (propertiesOfJsxElementAttribPropInterface.length === 1) {
                     return propertiesOfJsxElementAttribPropInterface[0].escapedName;
                 }
                 else if (propertiesOfJsxElementAttribPropInterface.length > 1) {
+                    // More than one property on ElementAttributesProperty is an error
                     error(jsxElementAttribPropInterfaceSym.declarations[0], ts.Diagnostics.The_global_type_JSX_0_may_not_have_more_than_one_property, ts.unescapeLeadingUnderscores(nameOfAttribPropContainer));
                 }
             }
             return undefined;
         }
+        /// e.g. "props" for React.d.ts,
+        /// or 'undefined' if ElementAttributesProperty doesn't exist (which means all
+        ///     non-intrinsic elements' attributes type is 'any'),
+        /// or '' if it has 0 properties (which means every
+        ///     non-intrinsic elements' attributes type is the element instance type)
         function getJsxElementPropertiesName(jsxNamespace) {
             return getNameFromJsxElementAttributesContainer(JsxNames.ElementAttributesPropertyNameContainer, jsxNamespace);
         }
@@ -34620,7 +44212,7 @@ var ts;
             if (!propsType) {
                 return undefined;
             }
-            if (propsType.flags & 524288) {
+            if (propsType.flags & 524288 /* Intersection */) {
                 var propsApparentType = [];
                 for (var _i = 0, _a = propsType.types; _i < _a.length; _i++) {
                     var t = _a[_i];
@@ -34630,17 +44222,29 @@ var ts;
             }
             return getApparentType(propsType);
         }
+        /**
+         * Get JSX attributes type by trying to resolve openingLikeElement as a stateless function component.
+         * Return only attributes type of successfully resolved call signature.
+         * This function assumes that the caller handled other possible element type of the JSX element (e.g. stateful component)
+         * Unlike tryGetAllJsxStatelessFunctionAttributesType, this function is a default behavior of type-checkers.
+         * @param openingLikeElement a JSX opening-like element to find attributes type
+         * @param elementType a type of the opening-like element. This elementType can't be an union type
+         * @param elemInstanceType an element instance type (the result of newing or invoking this tag)
+         * @param elementClassType a JSX-ElementClass type. This is a result of looking up ElementClass interface in the JSX global
+         */
         function defaultTryGetJsxStatelessFunctionAttributesType(openingLikeElement, elementType, elemInstanceType, elementClassType) {
-            ts.Debug.assert(!(elementType.flags & 262144));
+            ts.Debug.assert(!(elementType.flags & 262144 /* Union */));
             if (!elementClassType || !isTypeAssignableTo(elemInstanceType, elementClassType)) {
                 var jsxStatelessElementType = getJsxStatelessElementTypeAt(openingLikeElement);
                 if (jsxStatelessElementType) {
-                    var callSignature = getResolvedJsxStatelessFunctionSignature(openingLikeElement, elementType, undefined);
+                    // We don't call getResolvedSignature here because we have already resolve the type of JSX Element.
+                    var callSignature = getResolvedJsxStatelessFunctionSignature(openingLikeElement, elementType, /*candidatesOutArray*/ undefined);
                     if (callSignature !== unknownSignature) {
                         var callReturnType = callSignature && getReturnTypeOfSignature(callSignature);
                         var paramType = callReturnType && (callSignature.parameters.length === 0 ? emptyObjectType : getTypeOfSymbol(callSignature.parameters[0]));
                         paramType = getApparentTypeOfJsxPropsType(paramType);
                         if (callReturnType && isTypeAssignableTo(callReturnType, jsxStatelessElementType)) {
+                            // Intersect in JSX.IntrinsicAttributes if it exists
                             var intrinsicAttributes = getJsxType(JsxNames.IntrinsicAttributes, openingLikeElement);
                             if (intrinsicAttributes !== errorType) {
                                 paramType = intersectTypes(intrinsicAttributes, paramType);
@@ -34652,11 +44256,23 @@ var ts;
             }
             return undefined;
         }
+        /**
+         * Get JSX attributes type by trying to resolve openingLikeElement as a stateless function component.
+         * Return all attributes type of resolved call signature including candidate signatures.
+         * This function assumes that the caller handled other possible element type of the JSX element.
+         * This function is a behavior used by language service when looking up completion in JSX element.
+         * @param openingLikeElement a JSX opening-like element to find attributes type
+         * @param elementType a type of the opening-like element. This elementType can't be an union type
+         * @param elemInstanceType an element instance type (the result of newing or invoking this tag)
+         * @param elementClassType a JSX-ElementClass type. This is a result of looking up ElementClass interface in the JSX global
+         */
         function tryGetAllJsxStatelessFunctionAttributesType(openingLikeElement, elementType, elemInstanceType, elementClassType) {
-            ts.Debug.assert(!(elementType.flags & 262144));
+            ts.Debug.assert(!(elementType.flags & 262144 /* Union */));
             if (!elementClassType || !isTypeAssignableTo(elemInstanceType, elementClassType)) {
+                // Is this is a stateless function component? See if its single signature's return type is assignable to the JSX Element Type
                 var jsxStatelessElementType = getJsxStatelessElementTypeAt(openingLikeElement);
                 if (jsxStatelessElementType) {
+                    // We don't call getResolvedSignature because here we have already resolve the type of JSX Element.
                     var candidatesOutArray = [];
                     getResolvedJsxStatelessFunctionSignature(openingLikeElement, elementType, candidatesOutArray);
                     var result = void 0;
@@ -34664,6 +44280,7 @@ var ts;
                     for (var _i = 0, candidatesOutArray_1 = candidatesOutArray; _i < candidatesOutArray_1.length; _i++) {
                         var candidate = candidatesOutArray_1[_i];
                         var callReturnType = getReturnTypeOfSignature(candidate);
+                        // TODO: GH#18217: callReturnType should always be defined...
                         var paramType = callReturnType && (candidate.parameters.length === 0 ? emptyObjectType : getTypeOfSymbol(candidate.parameters[0]));
                         paramType = getApparentTypeOfJsxPropsType(paramType);
                         if (callReturnType && isTypeAssignableTo(callReturnType, jsxStatelessElementType)) {
@@ -34672,7 +44289,7 @@ var ts;
                                 var attribute = _b[_a];
                                 if (ts.isJsxAttribute(attribute) &&
                                     isUnhyphenatedJsxName(attribute.name.escapedText) &&
-                                    !getPropertyOfType(paramType, attribute.name.escapedText)) {
+                                    !getPropertyOfType(paramType, attribute.name.escapedText)) { // TODO: GH#18217
                                     shouldBeCandidate = false;
                                     break;
                                 }
@@ -34683,9 +44300,11 @@ var ts;
                             allMatchingAttributesType = intersectTypes(allMatchingAttributesType, paramType);
                         }
                     }
+                    // If we can't find any matching, just return everything.
                     if (!result) {
                         result = allMatchingAttributesType;
                     }
+                    // Intersect in JSX.IntrinsicAttributes if it exists
                     var intrinsicAttributes = getJsxType(JsxNames.IntrinsicAttributes, openingLikeElement);
                     if (intrinsicAttributes !== errorType) {
                         result = intersectTypes(intrinsicAttributes, result);
@@ -34708,34 +44327,62 @@ var ts;
                 return links.resolvedSignatures.get(cacheKey);
             }
             links.resolvedSignatures.set(cacheKey, resolvingSignaturesArray);
-            var signatures = getSignaturesOfType(elementType, 1);
+            // Resolve the signatures, preferring constructor
+            var signatures = getSignaturesOfType(elementType, 1 /* Construct */);
             if (signatures.length === 0) {
-                signatures = getSignaturesOfType(elementType, 0);
+                // No construct signatures, try call signatures
+                signatures = getSignaturesOfType(elementType, 0 /* Call */);
                 if (signatures.length === 0) {
+                    // We found no signatures at all, which is an error
                     if (reportErrors) {
                         error(openingLikeElement.tagName, ts.Diagnostics.JSX_element_type_0_does_not_have_any_construct_or_call_signatures, ts.getTextOfNode(openingLikeElement.tagName));
                     }
                     return;
                 }
             }
+            // Instantiate in context of source type
             var results = instantiateJsxSignatures(openingLikeElement, signatures);
             links.resolvedSignatures.set(cacheKey, results);
             return results;
         }
+        /**
+         * Resolve attributes type of the given opening-like element. The attributes type is a type of attributes associated with the given elementType.
+         * For instance:
+         *      declare function Foo(attr: { p1: string}): JSX.Element;
+         *      <Foo p1={10} />;  // This function will try resolve "Foo" and return an attributes type of "Foo" which is "{ p1: string }"
+         *
+         * The function is intended to initially be called from getAttributesTypeFromJsxOpeningLikeElement which already handle JSX-intrinsic-element..
+         * This function will try to resolve custom JSX attributes type in following order: string literal, stateless function, and stateful component
+         *
+         * @param openingLikeElement a non-intrinsic JSXOPeningLikeElement
+         * @param shouldIncludeAllStatelessAttributesType a boolean indicating whether to include all attributes types from all stateless function signature
+         * @param sourceAttributesType Is the attributes type the user passed, and is used to create inferences in the target type if present
+         * @param elementType an instance type of the given opening-like element. If undefined, the function will check type openinglikeElement's tagname.
+         * @param elementClassType a JSX-ElementClass type. This is a result of looking up ElementClass interface in the JSX global (imported from react.d.ts)
+         * @return attributes type if able to resolve the type of node
+         *         anyType if there is no type ElementAttributesProperty or there is an error
+         *         emptyObjectType if there is no "prop" in the element instance type
+         */
         function resolveCustomJsxElementAttributesType(openingLikeElement, shouldIncludeAllStatelessAttributesType, elementType, elementClassType) {
-            if (elementType.flags & 262144) {
+            if (elementType.flags & 262144 /* Union */) {
                 var types = elementType.types;
                 return getUnionType(types.map(function (type) {
                     return resolveCustomJsxElementAttributesType(openingLikeElement, shouldIncludeAllStatelessAttributesType, type, elementClassType);
-                }), 2);
+                }), 2 /* Subtype */);
             }
+            // Shortcircuit any
             if (isTypeAny(elementType)) {
                 return elementType;
             }
-            else if (elementType.flags & 4) {
+            // If the elemType is a string type, we have to return anyType to prevent an error downstream as we will try to find construct or call signature of the type
+            else if (elementType.flags & 4 /* String */) {
                 return anyType;
             }
-            else if (elementType.flags & 64) {
+            else if (elementType.flags & 64 /* StringLiteral */) {
+                // If the elemType is a stringLiteral type, we can then provide a check to make sure that the string literal type is one of the Jsx intrinsic element type
+                // For example:
+                //      var CustomTag: "h1" = "h1";
+                //      <CustomTag> Hello World </CustomTag>
                 var intrinsicElementsType = getJsxType(JsxNames.IntrinsicElements, openingLikeElement);
                 if (intrinsicElementsType !== errorType) {
                     var stringLiteralTypeName = elementType.value;
@@ -34743,41 +44390,51 @@ var ts;
                     if (intrinsicProp) {
                         return getTypeOfSymbol(intrinsicProp);
                     }
-                    var indexSignatureType = getIndexTypeOfType(intrinsicElementsType, 0);
+                    var indexSignatureType = getIndexTypeOfType(intrinsicElementsType, 0 /* String */);
                     if (indexSignatureType) {
                         return indexSignatureType;
                     }
                     error(openingLikeElement, ts.Diagnostics.Property_0_does_not_exist_on_type_1, stringLiteralTypeName, "JSX." + JsxNames.IntrinsicElements);
                 }
+                // If we need to report an error, we already done so here. So just return any to prevent any more error downstream
                 return anyType;
             }
-            var instantiatedSignatures = getInstantiatedJsxSignatures(openingLikeElement, elementType, true);
+            // Get the element instance type (the result of newing or invoking this tag)
+            var instantiatedSignatures = getInstantiatedJsxSignatures(openingLikeElement, elementType, /*reportErrors*/ true);
             if (!ts.length(instantiatedSignatures)) {
                 return errorType;
             }
-            var elemInstanceType = getUnionType(instantiatedSignatures.map(getReturnTypeOfSignature), 2);
+            var elemInstanceType = getUnionType(instantiatedSignatures.map(getReturnTypeOfSignature), 2 /* Subtype */);
+            // If we should include all stateless attributes type, then get all attributes type from all stateless function signature.
+            // Otherwise get only attributes type from the signature picked by choose-overload logic.
             var statelessAttributesType = shouldIncludeAllStatelessAttributesType ?
                 tryGetAllJsxStatelessFunctionAttributesType(openingLikeElement, elementType, elemInstanceType, elementClassType) :
                 defaultTryGetJsxStatelessFunctionAttributesType(openingLikeElement, elementType, elemInstanceType, elementClassType);
             if (statelessAttributesType) {
                 return statelessAttributesType;
             }
+            // Issue an error if this return type isn't assignable to JSX.ElementClass
             if (elementClassType) {
                 checkTypeRelatedTo(elemInstanceType, elementClassType, assignableRelation, openingLikeElement, ts.Diagnostics.JSX_element_type_0_is_not_a_constructor_function_for_JSX_elements);
             }
             var isJs = ts.isInJavaScriptFile(openingLikeElement);
-            return getUnionType(instantiatedSignatures.map(function (sig) { return getJsxPropsTypeFromClassType(sig, isJs, openingLikeElement, true); }));
+            return getUnionType(instantiatedSignatures.map(function (sig) { return getJsxPropsTypeFromClassType(sig, isJs, openingLikeElement, /*reportErrors*/ true); }));
         }
+        /**
+         * Get attributes type of the given intrinsic opening-like Jsx element by resolving the tag name.
+         * The function is intended to be called from a function which has checked that the opening element is an intrinsic element.
+         * @param node an intrinsic JSX opening-like element
+         */
         function getIntrinsicAttributesTypeFromJsxOpeningLikeElement(node) {
             ts.Debug.assert(isJsxIntrinsicIdentifier(node.tagName));
             var links = getNodeLinks(node);
             if (!links.resolvedJsxElementAttributesType) {
                 var symbol = getIntrinsicTagSymbol(node);
-                if (links.jsxFlags & 1) {
+                if (links.jsxFlags & 1 /* IntrinsicNamedElement */) {
                     return links.resolvedJsxElementAttributesType = getTypeOfSymbol(symbol);
                 }
-                else if (links.jsxFlags & 2) {
-                    return links.resolvedJsxElementAttributesType = getIndexInfoOfSymbol(symbol, 0).type;
+                else if (links.jsxFlags & 2 /* IntrinsicIndexedElement */) {
+                    return links.resolvedJsxElementAttributesType = getIndexInfoOfSymbol(symbol, 0 /* String */).type;
                 }
                 else {
                     return links.resolvedJsxElementAttributesType = errorType;
@@ -34785,25 +44442,48 @@ var ts;
             }
             return links.resolvedJsxElementAttributesType;
         }
+        /**
+         * Get attributes type of the given custom opening-like JSX element.
+         * This function is intended to be called from a caller that handles intrinsic JSX element already.
+         * @param node a custom JSX opening-like element
+         * @param shouldIncludeAllStatelessAttributesType a boolean value used by language service to get all possible attributes type from an overload stateless function component
+         */
         function getCustomJsxElementAttributesType(node, shouldIncludeAllStatelessAttributesType) {
             return resolveCustomJsxElementAttributesType(node, shouldIncludeAllStatelessAttributesType, checkExpression(node.tagName), getJsxElementClassTypeAt(node));
         }
+        /**
+         * Get all possible attributes type, especially from an overload stateless function component, of the given JSX opening-like element.
+         * This function is called by language service (see: completions-tryGetGlobalSymbols).
+         * @param node a JSX opening-like element to get attributes type for
+         */
         function getAllAttributesTypeFromJsxOpeningLikeElement(node) {
             if (isJsxIntrinsicIdentifier(node.tagName)) {
                 return getIntrinsicAttributesTypeFromJsxOpeningLikeElement(node);
             }
             else {
-                return getCustomJsxElementAttributesType(node, true);
+                // Because in language service, the given JSX opening-like element may be incomplete and therefore,
+                // we can't resolve to exact signature if the element is a stateless function component so the best thing to do is return all attributes type from all overloads.
+                return getCustomJsxElementAttributesType(node, /*shouldIncludeAllStatelessAttributesType*/ true);
             }
         }
+        /**
+         * Get the attributes type, which indicates the attributes that are valid on the given JSXOpeningLikeElement.
+         * @param node a JSXOpeningLikeElement node
+         * @return an attributes type of the given node
+         */
         function getAttributesTypeFromJsxOpeningLikeElement(node) {
             if (isJsxIntrinsicIdentifier(node.tagName)) {
                 return getIntrinsicAttributesTypeFromJsxOpeningLikeElement(node);
             }
             else {
-                return getCustomJsxElementAttributesType(node, false);
+                return getCustomJsxElementAttributesType(node, /*shouldIncludeAllStatelessAttributesType*/ false);
             }
         }
+        /**
+         * Given a JSX attribute, returns the symbol for the corresponds property
+         * of the element attributes type. Will return unknownSymbol for attributes
+         * that have no matching element attributes type property.
+         */
         function getJsxAttributePropertySymbol(attrib) {
             var attributesType = getAttributesTypeFromJsxOpeningLikeElement(attrib.parent.parent);
             var prop = getPropertyOfType(attributesType, attrib.name.escapedText);
@@ -34824,12 +44504,16 @@ var ts;
                 return getUnionType([jsxElementType, nullType]);
             }
         }
+        /**
+         * Returns all the properties of the Jsx.IntrinsicElements interface
+         */
         function getJsxIntrinsicTagNamesAt(location) {
             var intrinsics = getJsxType(JsxNames.IntrinsicElements, location);
             return intrinsics ? getPropertiesOfType(intrinsics) : ts.emptyArray;
         }
         function checkJsxPreconditions(errorNode) {
-            if ((compilerOptions.jsx || 0) === 0) {
+            // Preconditions for using JSX
+            if ((compilerOptions.jsx || 0 /* None */) === 0 /* None */) {
                 error(errorNode, ts.Diagnostics.Cannot_use_JSX_unless_the_jsx_flag_is_provided);
             }
             if (getJsxElementTypeAt(errorNode) === undefined) {
@@ -34844,13 +44528,18 @@ var ts;
                 checkGrammarJsxElement(node);
             }
             checkJsxPreconditions(node);
-            var reactRefErr = diagnostics && compilerOptions.jsx === 2 ? ts.Diagnostics.Cannot_find_name_0 : undefined;
+            // The reactNamespace/jsxFactory's root symbol should be marked as 'used' so we don't incorrectly elide its import.
+            // And if there is no reactNamespace/jsxFactory's symbol in scope when targeting React emit, we should issue an error.
+            var reactRefErr = diagnostics && compilerOptions.jsx === 2 /* React */ ? ts.Diagnostics.Cannot_find_name_0 : undefined;
             var reactNamespace = getJsxNamespace(node);
             var reactLocation = isNodeOpeningLikeElement ? node.tagName : node;
-            var reactSym = resolveName(reactLocation, reactNamespace, 67216319, reactRefErr, reactNamespace, true);
+            var reactSym = resolveName(reactLocation, reactNamespace, 67216319 /* Value */, reactRefErr, reactNamespace, /*isUse*/ true);
             if (reactSym) {
-                reactSym.isReferenced = 67108863;
-                if (reactSym.flags & 2097152 && !isConstEnumOrConstEnumOnlyModule(resolveAlias(reactSym))) {
+                // Mark local symbol as referenced here because it might not have been marked
+                // if jsx emit was not react as there wont be error being emitted
+                reactSym.isReferenced = 67108863 /* All */;
+                // If react symbol is alias, mark it as refereced
+                if (reactSym.flags & 2097152 /* Alias */ && !isConstEnumOrConstEnumOnlyModule(resolveAlias(reactSym))) {
                     markAliasSymbolAsReferenced(reactSym);
                 }
             }
@@ -34861,17 +44550,31 @@ var ts;
                 checkJsxChildren(node.parent);
             }
         }
+        /**
+         * Check if a property with the given name is known anywhere in the given type. In an object type, a property
+         * is considered known if
+         * 1. the object type is empty and the check is for assignability, or
+         * 2. if the object type has index signatures, or
+         * 3. if the property is actually declared in the object type
+         *    (this means that 'toString', for example, is not usually a known property).
+         * 4. In a union or intersection type,
+         *    a property is considered known if it is known in any constituent type.
+         * @param targetType a type to search a given name in
+         * @param name a property name to search
+         * @param isComparingJsxAttributes a boolean flag indicating whether we are searching in JsxAttributesType
+         */
         function isKnownProperty(targetType, name, isComparingJsxAttributes) {
-            if (targetType.flags & 131072) {
+            if (targetType.flags & 131072 /* Object */) {
                 var resolved = resolveStructuredTypeMembers(targetType);
                 if (resolved.stringIndexInfo ||
                     resolved.numberIndexInfo && isNumericLiteralName(name) ||
                     getPropertyOfObjectType(targetType, name) ||
                     isComparingJsxAttributes && !isUnhyphenatedJsxName(name)) {
+                    // For JSXAttributes, if the attribute has a hyphenated name, consider that the attribute to be known.
                     return true;
                 }
             }
-            else if (targetType.flags & 786432) {
+            else if (targetType.flags & 786432 /* UnionOrIntersection */) {
                 for (var _i = 0, _a = targetType.types; _i < _a.length; _i++) {
                     var t = _a[_i];
                     if (isKnownProperty(t, name, isComparingJsxAttributes)) {
@@ -34881,12 +44584,30 @@ var ts;
             }
             return false;
         }
+        /**
+         * Check whether the given attributes of JSX opening-like element is assignable to the tagName attributes.
+         *      Get the attributes type of the opening-like element through resolving the tagName, "target attributes"
+         *      Check assignablity between given attributes property, "source attributes", and the "target attributes"
+         * @param openingLikeElement an opening-like JSX element to check its JSXAttributes
+         */
         function checkJsxAttributesAssignableToTagNameAttributes(openingLikeElement, checkMode) {
+            // The function involves following steps:
+            //      1. Figure out expected attributes type by resolving tagName of the JSX opening-like element, targetAttributesType.
+            //         During these steps, we will try to resolve the tagName as intrinsic name, stateless function, stateful component (in the order)
+            //      2. Solved JSX attributes type given by users, sourceAttributesType, which is by resolving "attributes" property of the JSX opening-like element.
+            //      3. Check if the two are assignable to each other
+            // targetAttributesType is a type of an attribute from resolving tagName of an opening-like JSX element.
             var targetAttributesType = isJsxIntrinsicIdentifier(openingLikeElement.tagName) ?
                 getIntrinsicAttributesTypeFromJsxOpeningLikeElement(openingLikeElement) :
-                getCustomJsxElementAttributesType(openingLikeElement, false);
+                getCustomJsxElementAttributesType(openingLikeElement, /*shouldIncludeAllStatelessAttributesType*/ false);
+            // sourceAttributesType is a type of an attributes properties.
+            // i.e <div attr1={10} attr2="string" />
+            //     attr1 and attr2 are treated as JSXAttributes attached in the JsxOpeningLikeElement as "attributes".
             var sourceAttributesType = createJsxAttributesTypeFromAttributesProperty(openingLikeElement, checkMode);
+            // Check if sourceAttributesType assignable to targetAttributesType though this check will allow excess properties
             var isSourceAttributeTypeAssignableToTarget = isTypeAssignableTo(sourceAttributesType, targetAttributesType);
+            // After we check for assignability, we will do another pass to check that all explicitly specified attributes have correct name corresponding in targetAttributeType.
+            // This will allow excess properties in spread type as it is very common pattern to spread outer attributes into React component in its render method.
             if (isSourceAttributeTypeAssignableToTarget && !isTypeAny(sourceAttributesType) && !isTypeAny(targetAttributesType)) {
                 for (var _i = 0, _a = openingLikeElement.attributes.properties; _i < _a.length; _i++) {
                     var attribute = _a[_i];
@@ -34895,34 +44616,38 @@ var ts;
                     }
                     var attrName = attribute.name;
                     var isNotIgnoredJsxProperty = (isUnhyphenatedJsxName(ts.idText(attrName)) || !!(getPropertyOfType(targetAttributesType, attrName.escapedText)));
-                    if (isNotIgnoredJsxProperty && !isKnownProperty(targetAttributesType, attrName.escapedText, true)) {
+                    if (isNotIgnoredJsxProperty && !isKnownProperty(targetAttributesType, attrName.escapedText, /*isComparingJsxAttributes*/ true)) {
                         error(attribute, ts.Diagnostics.Property_0_does_not_exist_on_type_1, ts.idText(attrName), typeToString(targetAttributesType));
+                        // We break here so that errors won't be cascading
                         break;
                     }
                 }
             }
             else if (!isSourceAttributeTypeAssignableToTarget) {
+                // Assignability failure - check each prop individually, and if that fails, fall back on the bad error span
                 if (ts.length(openingLikeElement.attributes.properties)) {
                     var reportedError = false;
-                    var _loop_7 = function (prop) {
+                    var _loop_5 = function (prop) {
                         if (ts.isJsxSpreadAttribute(prop))
                             return "continue";
                         var name = ts.idText(prop.name);
                         var sourcePropType = getIndexedAccessType(sourceAttributesType, getLiteralType(name));
                         var targetPropType = getIndexedAccessType(targetAttributesType, getLiteralType(name));
-                        var rootChain = function () { return ts.chainDiagnosticMessages(undefined, ts.Diagnostics.Types_of_property_0_are_incompatible, name); };
-                        if (!checkTypeAssignableTo(sourcePropType, targetPropType, prop, undefined, rootChain)) {
+                        var rootChain = function () { return ts.chainDiagnosticMessages(
+                        /*details*/ undefined, ts.Diagnostics.Types_of_property_0_are_incompatible, name); };
+                        if (!checkTypeAssignableTo(sourcePropType, targetPropType, prop, /*headMessage*/ undefined, rootChain)) {
                             reportedError = true;
                         }
                     };
                     for (var _b = 0, _c = openingLikeElement.attributes.properties; _b < _c.length; _b++) {
                         var prop = _c[_b];
-                        _loop_7(prop);
+                        _loop_5(prop);
                     }
                     if (reportedError) {
                         return;
                     }
                 }
+                // Report fallback error on just the component name
                 checkTypeAssignableTo(sourceAttributesType, targetAttributesType, openingLikeElement.tagName);
             }
         }
@@ -34938,56 +44663,86 @@ var ts;
                 return errorType;
             }
         }
+        // If a symbol is a synthesized symbol with no value declaration, we assume it is a property. Example of this are the synthesized
+        // '.prototype' property as well as synthesized tuple index properties.
         function getDeclarationKindFromSymbol(s) {
-            return s.valueDeclaration ? s.valueDeclaration.kind : 152;
+            return s.valueDeclaration ? s.valueDeclaration.kind : 152 /* PropertyDeclaration */;
         }
         function getDeclarationNodeFlagsFromSymbol(s) {
             return s.valueDeclaration ? ts.getCombinedNodeFlags(s.valueDeclaration) : 0;
         }
+        /**
+         * Return whether this symbol is a member of a prototype somewhere
+         * Note that this is not tracked well within the compiler, so the answer may be incorrect.
+         */
         function isPrototypeProperty(symbol) {
-            if (symbol.flags & 8192 || ts.getCheckFlags(symbol) & 4) {
+            if (symbol.flags & 8192 /* Method */ || ts.getCheckFlags(symbol) & 4 /* SyntheticMethod */) {
                 return true;
             }
             if (ts.isInJavaScriptFile(symbol.valueDeclaration)) {
                 var parent = symbol.valueDeclaration.parent;
                 return parent && ts.isBinaryExpression(parent) &&
-                    ts.getSpecialPropertyAssignmentKind(parent) === 3;
+                    ts.getSpecialPropertyAssignmentKind(parent) === 3 /* PrototypeProperty */;
             }
         }
+        /**
+         * Check whether the requested property access is valid.
+         * Returns true if node is a valid property access, and false otherwise.
+         * @param node The node to be checked.
+         * @param left The left hand side of the property access (e.g.: the super in `super.foo`).
+         * @param type The type of left.
+         * @param prop The symbol for the right hand side of the property access.
+         */
         function checkPropertyAccessibility(node, left, type, prop) {
             var flags = ts.getDeclarationModifierFlagsFromSymbol(prop);
-            var errorNode = node.kind === 185 || node.kind === 232 ?
+            var errorNode = node.kind === 185 /* PropertyAccessExpression */ || node.kind === 232 /* VariableDeclaration */ ?
                 node.name :
-                node.kind === 179 ?
+                node.kind === 179 /* ImportType */ ?
                     node :
                     node.right;
-            if (ts.getCheckFlags(prop) & 256) {
+            if (ts.getCheckFlags(prop) & 256 /* ContainsPrivate */) {
+                // Synthetic property with private constituent property
                 error(errorNode, ts.Diagnostics.Property_0_has_conflicting_declarations_and_is_inaccessible_in_type_1, symbolToString(prop), typeToString(type));
                 return false;
             }
-            if (left.kind === 97) {
-                if (languageVersion < 2) {
+            if (left.kind === 97 /* SuperKeyword */) {
+                // TS 1.0 spec (April 2014): 4.8.2
+                // - In a constructor, instance member function, instance member accessor, or
+                //   instance member variable initializer where this references a derived class instance,
+                //   a super property access is permitted and must specify a public instance member function of the base class.
+                // - In a static member function or static member accessor
+                //   where this references the constructor function object of a derived class,
+                //   a super property access is permitted and must specify a public static member function of the base class.
+                if (languageVersion < 2 /* ES2015 */) {
                     if (symbolHasNonMethodDeclaration(prop)) {
                         error(errorNode, ts.Diagnostics.Only_public_and_protected_methods_of_the_base_class_are_accessible_via_the_super_keyword);
                         return false;
                     }
                 }
-                if (flags & 128) {
+                if (flags & 128 /* Abstract */) {
+                    // A method cannot be accessed in a super property access if the method is abstract.
+                    // This error could mask a private property access error. But, a member
+                    // cannot simultaneously be private and abstract, so this will trigger an
+                    // additional error elsewhere.
                     error(errorNode, ts.Diagnostics.Abstract_method_0_in_class_1_cannot_be_accessed_via_super_expression, symbolToString(prop), typeToString(getDeclaringClass(prop)));
                     return false;
                 }
             }
-            if ((flags & 128) && ts.isThisProperty(node) && symbolHasNonMethodDeclaration(prop)) {
+            // Referencing abstract properties within their own constructors is not allowed
+            if ((flags & 128 /* Abstract */) && ts.isThisProperty(node) && symbolHasNonMethodDeclaration(prop)) {
                 var declaringClassDeclaration = ts.getClassLikeDeclarationOfSymbol(getParentOfSymbol(prop));
                 if (declaringClassDeclaration && isNodeWithinConstructorOfClass(node, declaringClassDeclaration)) {
-                    error(errorNode, ts.Diagnostics.Abstract_property_0_in_class_1_cannot_be_accessed_in_the_constructor, symbolToString(prop), ts.getTextOfIdentifierOrLiteral(declaringClassDeclaration.name));
+                    error(errorNode, ts.Diagnostics.Abstract_property_0_in_class_1_cannot_be_accessed_in_the_constructor, symbolToString(prop), ts.getTextOfIdentifierOrLiteral(declaringClassDeclaration.name)); // TODO: GH#18217
                     return false;
                 }
             }
-            if (!(flags & 24)) {
+            // Public properties are otherwise accessible.
+            if (!(flags & 24 /* NonPublicAccessibilityModifier */)) {
                 return true;
             }
-            if (flags & 8) {
+            // Property is known to be private or protected at this point
+            // Private property is accessible if the property is within the declaring class
+            if (flags & 8 /* Private */) {
                 var declaringClassDeclaration = ts.getClassLikeDeclarationOfSymbol(getParentOfSymbol(prop));
                 if (!isNodeWithinClass(node, declaringClassDeclaration)) {
                     error(errorNode, ts.Diagnostics.Property_0_is_private_and_only_accessible_within_class_1, symbolToString(prop), typeToString(getDeclaringClass(prop)));
@@ -34995,22 +44750,29 @@ var ts;
                 }
                 return true;
             }
-            if (left.kind === 97) {
+            // Property is known to be protected at this point
+            // All protected properties of a supertype are accessible in a super access
+            if (left.kind === 97 /* SuperKeyword */) {
                 return true;
             }
+            // Find the first enclosing class that has the declaring classes of the protected constituents
+            // of the property as base classes
             var enclosingClass = forEachEnclosingClass(node, function (enclosingDeclaration) {
                 var enclosingClass = getDeclaredTypeOfSymbol(getSymbolOfNode(enclosingDeclaration));
                 return isClassDerivedFromDeclaringClasses(enclosingClass, prop) ? enclosingClass : undefined;
             });
+            // A protected property is accessible if the property is within the declaring class or classes derived from it
             if (!enclosingClass) {
                 error(errorNode, ts.Diagnostics.Property_0_is_protected_and_only_accessible_within_class_1_and_its_subclasses, symbolToString(prop), typeToString(getDeclaringClass(prop) || type));
                 return false;
             }
-            if (flags & 32) {
+            // No further restrictions for static properties
+            if (flags & 32 /* Static */) {
                 return true;
             }
-            if (type.flags & 65536) {
-                type = type.isThisType ? getConstraintOfTypeParameter(type) : getBaseConstraintOfType(type);
+            if (type.flags & 65536 /* TypeParameter */) {
+                // get the original type -- represented as the type constraint of the 'this' type
+                type = type.isThisType ? getConstraintOfTypeParameter(type) : getBaseConstraintOfType(type); // TODO: GH#18217 Use a different variable that's allowed to be undefined
             }
             if (!type || !hasBaseType(type, enclosingClass)) {
                 error(errorNode, ts.Diagnostics.Property_0_is_protected_and_only_accessible_through_an_instance_of_class_1, symbolToString(prop), typeToString(enclosingClass));
@@ -35021,25 +44783,25 @@ var ts;
         function symbolHasNonMethodDeclaration(symbol) {
             return forEachProperty(symbol, function (prop) {
                 var propKind = getDeclarationKindFromSymbol(prop);
-                return propKind !== 154 && propKind !== 153;
+                return propKind !== 154 /* MethodDeclaration */ && propKind !== 153 /* MethodSignature */;
             });
         }
         function checkNonNullExpression(node, nullDiagnostic, undefinedDiagnostic, nullOrUndefinedDiagnostic) {
             return checkNonNullType(checkExpression(node), node, nullDiagnostic, undefinedDiagnostic, nullOrUndefinedDiagnostic);
         }
         function checkNonNullType(type, node, nullDiagnostic, undefinedDiagnostic, nullOrUndefinedDiagnostic) {
-            if (type.flags & 2) {
+            if (type.flags & 2 /* Unknown */) {
                 error(node, ts.Diagnostics.Object_is_of_type_unknown);
                 return errorType;
             }
-            var kind = (strictNullChecks ? getFalsyFlags(type) : type.flags) & 24576;
+            var kind = (strictNullChecks ? getFalsyFlags(type) : type.flags) & 24576 /* Nullable */;
             if (kind) {
-                error(node, kind & 8192 ? kind & 16384 ?
+                error(node, kind & 8192 /* Undefined */ ? kind & 16384 /* Null */ ?
                     (nullOrUndefinedDiagnostic || ts.Diagnostics.Object_is_possibly_null_or_undefined) :
                     (undefinedDiagnostic || ts.Diagnostics.Object_is_possibly_undefined) :
                     (nullDiagnostic || ts.Diagnostics.Object_is_possibly_null));
                 var t = getNonNullableType(type);
-                return t.flags & (24576 | 32768) ? errorType : t;
+                return t.flags & (24576 /* Nullable */ | 32768 /* Never */) ? errorType : t;
             }
             return type;
         }
@@ -35066,10 +44828,10 @@ var ts;
                 markAliasReferenced(parentSymbol, node);
             }
             if (!prop) {
-                var indexInfo = getIndexInfoOfType(apparentType, 0);
+                var indexInfo = getIndexInfoOfType(apparentType, 0 /* String */);
                 if (!(indexInfo && indexInfo.type)) {
                     if (right.escapedText && !checkAndReportErrorForExtendingInterface(node)) {
-                        reportNonexistentProperty(right, leftType.flags & 65536 && leftType.isThisType ? apparentType : leftType);
+                        reportNonexistentProperty(right, leftType.flags & 65536 /* TypeParameter */ && leftType.isThisType ? apparentType : leftType);
                     }
                     return errorType;
                 }
@@ -35080,7 +44842,7 @@ var ts;
             }
             else {
                 checkPropertyNotUsedBeforeDeclaration(prop, node, right);
-                markPropertyAsReferenced(prop, node, left.kind === 99);
+                markPropertyAsReferenced(prop, node, left.kind === 99 /* ThisKeyword */);
                 getNodeLinks(node).resolvedSymbol = prop;
                 checkPropertyAccessibility(node, left, apparentType, prop);
                 if (assignmentKind) {
@@ -35091,24 +44853,32 @@ var ts;
                 }
                 propType = getConstraintForLocation(getTypeOfSymbol(prop), node);
             }
-            if (node.kind !== 185 ||
-                assignmentKind === 1 ||
-                prop && !(prop.flags & (3 | 4 | 98304)) && !(prop.flags & 8192 && propType.flags & 262144)) {
+            // Only compute control flow type if this is a property access expression that isn't an
+            // assignment target, and the referenced property was declared as a variable, property,
+            // accessor, or optional method.
+            if (node.kind !== 185 /* PropertyAccessExpression */ ||
+                assignmentKind === 1 /* Definite */ ||
+                prop && !(prop.flags & (3 /* Variable */ | 4 /* Property */ | 98304 /* Accessor */)) && !(prop.flags & 8192 /* Method */ && propType.flags & 262144 /* Union */)) {
                 return propType;
             }
+            // If strict null checks and strict property initialization checks are enabled, if we have
+            // a this.xxx property access, if the property is an instance property without an initializer,
+            // and if we are in a constructor of the same class as the property declaration, assume that
+            // the property is uninitialized at the top of the control flow.
             var assumeUninitialized = false;
-            if (strictNullChecks && strictPropertyInitialization && left.kind === 99) {
+            if (strictNullChecks && strictPropertyInitialization && left.kind === 99 /* ThisKeyword */) {
                 var declaration = prop && prop.valueDeclaration;
                 if (declaration && isInstancePropertyWithoutInitializer(declaration)) {
                     var flowContainer = getControlFlowContainer(node);
-                    if (flowContainer.kind === 155 && flowContainer.parent === declaration.parent) {
+                    if (flowContainer.kind === 155 /* Constructor */ && flowContainer.parent === declaration.parent) {
                         assumeUninitialized = true;
                     }
                 }
             }
             var flowType = getFlowTypeOfReference(node, propType, assumeUninitialized ? getOptionalType(propType) : propType);
-            if (assumeUninitialized && !(getFalsyFlags(propType) & 8192) && getFalsyFlags(flowType) & 8192) {
-                error(right, ts.Diagnostics.Property_0_is_used_before_being_assigned, symbolToString(prop));
+            if (assumeUninitialized && !(getFalsyFlags(propType) & 8192 /* Undefined */) && getFalsyFlags(flowType) & 8192 /* Undefined */) {
+                error(right, ts.Diagnostics.Property_0_is_used_before_being_assigned, symbolToString(prop)); // TODO: GH#18217
+                // Return the declared type to reduce follow-on errors
                 return propType;
             }
             return assignmentKind ? getBaseTypeOfLiteralType(flowType) : flowType;
@@ -35123,9 +44893,9 @@ var ts;
                 && !isPropertyDeclaredInAncestorClass(prop)) {
                 error(right, ts.Diagnostics.Block_scoped_variable_0_used_before_its_declaration, ts.idText(right));
             }
-            else if (valueDeclaration.kind === 235 &&
-                node.parent.kind !== 162 &&
-                !(valueDeclaration.flags & 4194304) &&
+            else if (valueDeclaration.kind === 235 /* ClassDeclaration */ &&
+                node.parent.kind !== 162 /* TypeReference */ &&
+                !(valueDeclaration.flags & 4194304 /* Ambient */) &&
                 !isBlockScopedNameDeclaredBeforeUse(valueDeclaration, right)) {
                 error(right, ts.Diagnostics.Class_0_used_before_its_declaration, ts.idText(right));
             }
@@ -35133,17 +44903,22 @@ var ts;
         function isInPropertyInitializer(node) {
             return !!ts.findAncestor(node, function (node) {
                 switch (node.kind) {
-                    case 152:
+                    case 152 /* PropertyDeclaration */:
                         return true;
-                    case 270:
+                    case 270 /* PropertyAssignment */:
+                        // We might be in `a = { b: this.b }`, so keep looking. See `tests/cases/compiler/useBeforeDeclaration_propertyAssignment.ts`.
                         return false;
                     default:
                         return ts.isExpressionNode(node) ? false : "quit";
                 }
             });
         }
+        /**
+         * It's possible that "prop.valueDeclaration" is a local declaration, but the property was also declared in a superclass.
+         * In that case we won't consider it used before its declaration, because it gets its value from the superclass' declaration.
+         */
         function isPropertyDeclaredInAncestorClass(prop) {
-            if (!(prop.parent.flags & 32)) {
+            if (!(prop.parent.flags & 32 /* Class */)) {
                 return false;
             }
             var classType = getTypeOfSymbol(prop.parent);
@@ -35167,7 +44942,7 @@ var ts;
         }
         function reportNonexistentProperty(propNode, containingType) {
             var errorInfo;
-            if (containingType.flags & 262144 && !(containingType.flags & 32764)) {
+            if (containingType.flags & 262144 /* Union */ && !(containingType.flags & 32764 /* Primitive */)) {
                 for (var _i = 0, _a = containingType.types; _i < _a.length; _i++) {
                     var subtype = _a[_i];
                     if (!getPropertyOfType(subtype, propNode.escapedText)) {
@@ -35192,129 +44967,80 @@ var ts;
             diagnostics.add(ts.createDiagnosticForNodeFromMessageChain(propNode, errorInfo));
         }
         function getSuggestionForNonexistentProperty(node, containingType) {
-            var suggestion = getSpellingSuggestionForName(ts.idText(node), getPropertiesOfType(containingType), 67216319);
+            var suggestion = getSpellingSuggestionForName(ts.idText(node), getPropertiesOfType(containingType), 67216319 /* Value */);
             return suggestion && ts.symbolName(suggestion);
         }
         function getSuggestionForNonexistentSymbol(location, outerName, meaning) {
             ts.Debug.assert(outerName !== undefined, "outername should always be defined");
-            var result = resolveNameHelper(location, outerName, meaning, undefined, outerName, false, false, function (symbols, name, meaning) {
+            var result = resolveNameHelper(location, outerName, meaning, /*nameNotFoundMessage*/ undefined, outerName, /*isUse*/ false, /*excludeGlobals*/ false, function (symbols, name, meaning) {
                 ts.Debug.assertEqual(outerName, name, "name should equal outerName");
                 var symbol = getSymbol(symbols, name, meaning);
+                // Sometimes the symbol is found when location is a return type of a function: `typeof x` and `x` is declared in the body of the function
+                // So the table *contains* `x` but `x` isn't actually in scope.
+                // However, resolveNameHelper will continue and call this callback again, so we'll eventually get a correct suggestion.
                 return symbol || getSpellingSuggestionForName(ts.unescapeLeadingUnderscores(name), ts.arrayFrom(symbols.values()), meaning);
             });
             return result && ts.symbolName(result);
         }
         function getSuggestionForNonexistentModule(name, targetModule) {
-            var suggestion = targetModule.exports && getSpellingSuggestionForName(ts.idText(name), getExportsOfModuleAsArray(targetModule), 2623475);
+            var suggestion = targetModule.exports && getSpellingSuggestionForName(ts.idText(name), getExportsOfModuleAsArray(targetModule), 2623475 /* ModuleMember */);
             return suggestion && ts.symbolName(suggestion);
         }
+        /**
+         * Given a name and a list of symbols whose names are *not* equal to the name, return a spelling suggestion if there is one that is close enough.
+         * Names less than length 3 only check for case-insensitive equality, not levenshtein distance.
+         *
+         * If there is a candidate that's the same except for case, return that.
+         * If there is a candidate that's within one edit of the name, return that.
+         * Otherwise, return the candidate with the smallest Levenshtein distance,
+         *    except for candidates:
+         *      * With no name
+         *      * Whose meaning doesn't match the `meaning` parameter.
+         *      * Whose length differs from the target name by more than 0.34 of the length of the name.
+         *      * Whose levenshtein distance is more than 0.4 of the length of the name
+         *        (0.4 allows 1 substitution/transposition for every 5 characters,
+         *         and 1 insertion/deletion at 3 characters)
+         */
         function getSpellingSuggestionForName(name, symbols, meaning) {
-            var maximumLengthDifference = Math.min(2, Math.floor(name.length * 0.34));
-            var bestDistance = Math.floor(name.length * 0.4) + 1;
-            var bestCandidate;
-            var justCheckExactMatches = false;
-            var nameLowerCase = name.toLowerCase();
-            for (var _i = 0, symbols_3 = symbols; _i < symbols_3.length; _i++) {
-                var candidate = symbols_3[_i];
+            return ts.getSpellingSuggestion(name, symbols, getCandidateName);
+            function getCandidateName(candidate) {
                 var candidateName = ts.symbolName(candidate);
-                if (candidateName.charCodeAt(0) === 34
-                    || !(candidate.flags & meaning && Math.abs(candidateName.length - nameLowerCase.length) <= maximumLengthDifference)) {
-                    continue;
-                }
-                var candidateNameLowerCase = candidateName.toLowerCase();
-                if (candidateNameLowerCase === nameLowerCase) {
-                    return candidate;
-                }
-                if (justCheckExactMatches) {
-                    continue;
-                }
-                if (candidateName.length < 3) {
-                    continue;
-                }
-                var distance = levenshteinWithMax(nameLowerCase, candidateNameLowerCase, bestDistance - 1);
-                if (distance === undefined) {
-                    continue;
-                }
-                if (distance < 3) {
-                    justCheckExactMatches = true;
-                    bestCandidate = candidate;
-                }
-                else {
-                    ts.Debug.assert(distance < bestDistance);
-                    bestDistance = distance;
-                    bestCandidate = candidate;
-                }
+                return !ts.startsWith(candidateName, "\"") && candidate.flags & meaning ? candidateName : undefined;
             }
-            return bestCandidate;
-        }
-        function levenshteinWithMax(s1, s2, max) {
-            var previous = new Array(s2.length + 1);
-            var current = new Array(s2.length + 1);
-            var big = max + 1;
-            for (var i = 0; i <= s2.length; i++) {
-                previous[i] = i;
-            }
-            for (var i = 1; i <= s1.length; i++) {
-                var c1 = s1.charCodeAt(i - 1);
-                var minJ = i > max ? i - max : 1;
-                var maxJ = s2.length > max + i ? max + i : s2.length;
-                current[0] = i;
-                var colMin = i;
-                for (var j = 1; j < minJ; j++) {
-                    current[j] = big;
-                }
-                for (var j = minJ; j <= maxJ; j++) {
-                    var dist = c1 === s2.charCodeAt(j - 1)
-                        ? previous[j - 1]
-                        : Math.min(previous[j] + 1, current[j - 1] + 1, previous[j - 1] + 2);
-                    current[j] = dist;
-                    colMin = Math.min(colMin, dist);
-                }
-                for (var j = maxJ + 1; j <= s2.length; j++) {
-                    current[j] = big;
-                }
-                if (colMin > max) {
-                    return undefined;
-                }
-                var temp = previous;
-                previous = current;
-                current = temp;
-            }
-            var res = previous[s2.length];
-            return res > max ? undefined : res;
         }
         function markPropertyAsReferenced(prop, nodeForCheckWriteOnly, isThisAccess) {
-            if (!prop || !(prop.flags & 106500) || !prop.valueDeclaration || !ts.hasModifier(prop.valueDeclaration, 8)) {
+            if (!prop || !(prop.flags & 106500 /* ClassMember */) || !prop.valueDeclaration || !ts.hasModifier(prop.valueDeclaration, 8 /* Private */)) {
                 return;
             }
-            if (nodeForCheckWriteOnly && ts.isWriteOnlyAccess(nodeForCheckWriteOnly) && !(prop.flags & 65536 && !(prop.flags & 32768))) {
+            if (nodeForCheckWriteOnly && ts.isWriteOnlyAccess(nodeForCheckWriteOnly) && !(prop.flags & 65536 /* SetAccessor */ && !(prop.flags & 32768 /* GetAccessor */))) {
                 return;
             }
             if (isThisAccess) {
+                // Find any FunctionLikeDeclaration because those create a new 'this' binding. But this should only matter for methods (or getters/setters).
                 var containingMethod = ts.findAncestor(nodeForCheckWriteOnly, ts.isFunctionLikeDeclaration);
                 if (containingMethod && containingMethod.symbol === prop) {
                     return;
                 }
             }
-            (ts.getCheckFlags(prop) & 1 ? getSymbolLinks(prop).target : prop).isReferenced = 67108863;
+            (ts.getCheckFlags(prop) & 1 /* Instantiated */ ? getSymbolLinks(prop).target : prop).isReferenced = 67108863 /* All */;
         }
         function isValidPropertyAccess(node, propertyName) {
             switch (node.kind) {
-                case 185:
+                case 185 /* PropertyAccessExpression */:
                     return isValidPropertyAccessWithType(node, node.expression, propertyName, getWidenedType(checkExpression(node.expression)));
-                case 146:
+                case 146 /* QualifiedName */:
                     return isValidPropertyAccessWithType(node, node.left, propertyName, getWidenedType(checkExpression(node.left)));
-                case 179:
+                case 179 /* ImportType */:
                     return isValidPropertyAccessWithType(node, node, propertyName, getTypeFromTypeNode(node));
             }
         }
         function isValidPropertyAccessForCompletions(node, type, property) {
-            return isValidPropertyAccessWithType(node, node.kind === 179 ? node : node.expression, property.escapedName, type)
-                && (!(property.flags & 8192) || isValidMethodAccess(property, type));
+            return isValidPropertyAccessWithType(node, node.kind === 179 /* ImportType */ ? node : node.expression, property.escapedName, type)
+                && (!(property.flags & 8192 /* Method */) || isValidMethodAccess(property, type));
         }
         function isValidMethodAccess(method, actualThisType) {
             var propType = getTypeOfPropertyOfType(actualThisType, method.escapedName);
-            var signatures = getSignaturesOfType(getNonNullableType(propType), 0);
+            var signatures = getSignaturesOfType(getNonNullableType(propType), 0 /* Call */);
             ts.Debug.assert(signatures.length !== 0);
             return signatures.some(function (sig) {
                 var signatureThisType = getThisTypeOfSignature(sig);
@@ -35325,7 +45051,7 @@ var ts;
             if (!sig.typeParameters) {
                 return signatureThisType;
             }
-            var context = createInferenceContext(sig.typeParameters, sig, 0);
+            var context = createInferenceContext(sig.typeParameters, sig, 0 /* None */);
             inferTypes(context.inferences, actualThisType, signatureThisType);
             return instantiateType(signatureThisType, createSignatureTypeMapper(sig, getInferredTypes(context)));
         }
@@ -35335,33 +45061,44 @@ var ts;
             }
             var prop = getPropertyOfType(type, propertyName);
             return prop ? checkPropertyAccessibility(node, left, type, prop)
-                : ts.isInJavaScriptFile(node) && (type.flags & 262144) !== 0 && type.types.some(function (elementType) { return isValidPropertyAccessWithType(node, left, propertyName, elementType); });
+                // In js files properties of unions are allowed in completion
+                : ts.isInJavaScriptFile(node) && (type.flags & 262144 /* Union */) !== 0 && type.types.some(function (elementType) { return isValidPropertyAccessWithType(node, left, propertyName, elementType); });
         }
+        /**
+         * Return the symbol of the for-in variable declared or referenced by the given for-in statement.
+         */
         function getForInVariableSymbol(node) {
             var initializer = node.initializer;
-            if (initializer.kind === 233) {
+            if (initializer.kind === 233 /* VariableDeclarationList */) {
                 var variable = initializer.declarations[0];
                 if (variable && !ts.isBindingPattern(variable.name)) {
                     return getSymbolOfNode(variable);
                 }
             }
-            else if (initializer.kind === 71) {
+            else if (initializer.kind === 71 /* Identifier */) {
                 return getResolvedSymbol(initializer);
             }
             return undefined;
         }
+        /**
+         * Return true if the given type is considered to have numeric property names.
+         */
         function hasNumericPropertyNames(type) {
-            return getIndexTypeOfType(type, 1) && !getIndexTypeOfType(type, 0);
+            return getIndexTypeOfType(type, 1 /* Number */) && !getIndexTypeOfType(type, 0 /* String */);
         }
+        /**
+         * Return true if given node is an expression consisting of an identifier (possibly parenthesized)
+         * that references a for-in variable for an object with numeric property names.
+         */
         function isForInVariableForNumericPropertyNames(expr) {
             var e = ts.skipParentheses(expr);
-            if (e.kind === 71) {
+            if (e.kind === 71 /* Identifier */) {
                 var symbol = getResolvedSymbol(e);
-                if (symbol.flags & 3) {
+                if (symbol.flags & 3 /* Variable */) {
                     var child = expr;
                     var node = expr.parent;
                     while (node) {
-                        if (node.kind === 221 &&
+                        if (node.kind === 221 /* ForInStatement */ &&
                             child === node.statement &&
                             getForInVariableSymbol(node) === symbol &&
                             hasNumericPropertyNames(getTypeOfExpression(node.expression))) {
@@ -35379,7 +45116,7 @@ var ts;
             var indexExpression = node.argumentExpression;
             if (!indexExpression) {
                 var sourceFile = ts.getSourceFileOfNode(node);
-                if (node.parent.kind === 188 && node.parent.expression === node) {
+                if (node.parent.kind === 188 /* NewExpression */ && node.parent.expression === node) {
                     var start = ts.skipTrivia(sourceFile.text, node.expression.end);
                     var end = node.end;
                     grammarErrorAtPos(sourceFile, start, end - start, ts.Diagnostics.new_T_cannot_be_used_to_create_an_array_Use_new_Array_T_instead);
@@ -35395,7 +45132,7 @@ var ts;
             if (objectType === errorType || objectType === silentNeverType) {
                 return objectType;
             }
-            if (isConstEnumObjectType(objectType) && indexExpression.kind !== 9) {
+            if (isConstEnumObjectType(objectType) && indexExpression.kind !== 9 /* StringLiteral */) {
                 error(indexExpression, ts.Diagnostics.A_const_enum_member_can_only_be_accessed_using_a_string_literal);
                 return errorType;
             }
@@ -35403,24 +45140,29 @@ var ts;
         }
         function checkThatExpressionIsProperSymbolReference(expression, expressionType, reportError) {
             if (expressionType === errorType) {
+                // There is already an error, so no need to report one.
                 return false;
             }
             if (!ts.isWellKnownSymbolSyntactically(expression)) {
                 return false;
             }
-            if ((expressionType.flags & 3072) === 0) {
+            // Make sure the property type is the primitive symbol type
+            if ((expressionType.flags & 3072 /* ESSymbolLike */) === 0) {
                 if (reportError) {
                     error(expression, ts.Diagnostics.A_computed_property_name_of_the_form_0_must_be_of_type_symbol, ts.getTextOfNode(expression));
                 }
                 return false;
             }
+            // The name is Symbol.<someName>, so make sure Symbol actually resolves to the
+            // global Symbol object
             var leftHandSide = expression.expression;
             var leftHandSideSymbol = getResolvedSymbol(leftHandSide);
             if (!leftHandSideSymbol) {
                 return false;
             }
-            var globalESSymbol = getGlobalESSymbolConstructorSymbol(true);
+            var globalESSymbol = getGlobalESSymbolConstructorSymbol(/*reportErrors*/ true);
             if (!globalESSymbol) {
+                // Already errored when we tried to look up the symbol
                 return false;
             }
             if (leftHandSideSymbol !== globalESSymbol) {
@@ -35432,16 +45174,19 @@ var ts;
             return true;
         }
         function callLikeExpressionMayHaveTypeArguments(node) {
+            // TODO: Also include tagged templates (https://github.com/Microsoft/TypeScript/issues/11947)
             return ts.isCallOrNewExpression(node);
         }
         function resolveUntypedCall(node) {
             if (callLikeExpressionMayHaveTypeArguments(node)) {
+                // Check type arguments even though we will give an error that untyped calls may not accept type arguments.
+                // This gets us diagnostics for the type arguments and marks them as referenced.
                 ts.forEach(node.typeArguments, checkSourceElement);
             }
-            if (node.kind === 189) {
+            if (node.kind === 189 /* TaggedTemplateExpression */) {
                 checkExpression(node.template);
             }
-            else if (node.kind !== 150) {
+            else if (node.kind !== 150 /* Decorator */) {
                 ts.forEach(node.arguments, function (argument) {
                     checkExpression(argument);
                 });
@@ -35452,6 +45197,14 @@ var ts;
             resolveUntypedCall(node);
             return unknownSignature;
         }
+        // Re-order candidate signatures into the result array. Assumes the result array to be empty.
+        // The candidate list orders groups in reverse, but within a group signatures are kept in declaration order
+        // A nit here is that we reorder only signatures that belong to the same symbol,
+        // so order how inherited signatures are processed is still preserved.
+        // interface A { (x: string): void }
+        // interface B extends A { (x: 'foo'): string }
+        // const b: B;
+        // b('foo') // <- here overloads should be processed as [(x:'foo'): string, (x: string): void]
         function reorderCandidates(signatures, result) {
             var lastParent;
             var lastSymbol;
@@ -35474,13 +45227,20 @@ var ts;
                     }
                 }
                 else {
+                    // current declaration belongs to a different symbol
+                    // set cutoffIndex so re-orderings in the future won't change result set from 0 to cutoffIndex
                     index = cutoffIndex = result.length;
                     lastParent = parent;
                 }
                 lastSymbol = symbol;
+                // specialized signatures always need to be placed before non-specialized signatures regardless
+                // of the cutoff position; see GH#1133
                 if (signature.hasLiteralTypes) {
                     specializedIndex++;
                     spliceIndex = specializedIndex;
+                    // The cutoff index always needs to be greater than or equal to the specialized signature index
+                    // in order to prevent non-specialized signatures from being added before a specialized
+                    // signature.
                     cutoffIndex++;
                 }
                 else {
@@ -35492,7 +45252,7 @@ var ts;
         function getSpreadArgumentIndex(args) {
             for (var i = 0; i < args.length; i++) {
                 var arg = args[i];
-                if (arg && arg.kind === 204) {
+                if (arg && arg.kind === 204 /* SpreadElement */) {
                     return i;
                 }
             }
@@ -35500,36 +45260,46 @@ var ts;
         }
         function hasCorrectArity(node, args, signature, signatureHelpTrailingComma) {
             if (signatureHelpTrailingComma === void 0) { signatureHelpTrailingComma = false; }
-            var argCount;
-            var typeArguments;
-            var callIsIncomplete = false;
+            var argCount; // Apparent number of arguments we will have in this call
+            var typeArguments; // Type arguments (undefined if none)
+            var callIsIncomplete = false; // In incomplete call we want to be lenient when we have too few arguments
             var spreadArgIndex = -1;
             if (ts.isJsxOpeningLikeElement(node)) {
+                // The arity check will be done in "checkApplicableSignatureForJsxOpeningLikeElement".
                 return true;
             }
-            if (node.kind === 189) {
+            if (node.kind === 189 /* TaggedTemplateExpression */) {
+                // Even if the call is incomplete, we'll have a missing expression as our last argument,
+                // so we can say the count is just the arg list length
                 argCount = args.length;
                 typeArguments = node.typeArguments;
-                if (node.template.kind === 202) {
-                    var lastSpan = ts.last(node.template.templateSpans);
+                if (node.template.kind === 202 /* TemplateExpression */) {
+                    // If a tagged template expression lacks a tail literal, the call is incomplete.
+                    // Specifically, a template only can end in a TemplateTail or a Missing literal.
+                    var lastSpan = ts.last(node.template.templateSpans); // we should always have at least one span.
                     callIsIncomplete = ts.nodeIsMissing(lastSpan.literal) || !!lastSpan.literal.isUnterminated;
                 }
                 else {
+                    // If the template didn't end in a backtick, or its beginning occurred right prior to EOF,
+                    // then this might actually turn out to be a TemplateHead in the future;
+                    // so we consider the call to be incomplete.
                     var templateLiteral = node.template;
-                    ts.Debug.assert(templateLiteral.kind === 13);
+                    ts.Debug.assert(templateLiteral.kind === 13 /* NoSubstitutionTemplateLiteral */);
                     callIsIncomplete = !!templateLiteral.isUnterminated;
                 }
             }
-            else if (node.kind === 150) {
+            else if (node.kind === 150 /* Decorator */) {
                 typeArguments = undefined;
-                argCount = getEffectiveArgumentCount(node, undefined, signature);
+                argCount = getEffectiveArgumentCount(node, /*args*/ undefined, signature);
             }
             else {
                 if (!node.arguments) {
-                    ts.Debug.assert(node.kind === 188);
+                    // This only happens when we have something of the form: 'new C'
+                    ts.Debug.assert(node.kind === 188 /* NewExpression */);
                     return signature.minArgumentCount === 0;
                 }
                 argCount = signatureHelpTrailingComma ? args.length + 1 : args.length;
+                // If we are missing the close parenthesis, the call is incomplete.
                 callIsIncomplete = node.arguments.end === node.end;
                 typeArguments = node.typeArguments;
                 spreadArgIndex = getSpreadArgumentIndex(args);
@@ -35537,24 +45307,30 @@ var ts;
             if (!hasCorrectTypeArgumentArity(signature, typeArguments)) {
                 return false;
             }
+            // If a spread argument is present, check that it corresponds to a rest parameter or at least that it's in the valid range.
             if (spreadArgIndex >= 0) {
                 return isRestParameterIndex(signature, spreadArgIndex) ||
                     signature.minArgumentCount <= spreadArgIndex && spreadArgIndex < signature.parameters.length;
             }
+            // Too many arguments implies incorrect arity.
             if (!signature.hasRestParameter && argCount > signature.parameters.length) {
                 return false;
             }
+            // If the call is incomplete, we should skip the lower bound check.
             var hasEnoughArguments = argCount >= signature.minArgumentCount;
             return callIsIncomplete || hasEnoughArguments;
         }
         function hasCorrectTypeArgumentArity(signature, typeArguments) {
+            // If the user supplied type arguments, but the number of type arguments does not match
+            // the declared number of type parameters, the call has an incorrect arity.
             var numTypeParameters = ts.length(signature.typeParameters);
             var minTypeArgumentCount = getMinTypeArgumentCount(signature.typeParameters);
             return !typeArguments ||
                 (typeArguments.length >= minTypeArgumentCount && typeArguments.length <= numTypeParameters);
         }
+        // If type has a single call signature and no other members, return that signature. Otherwise, return undefined.
         function getSingleCallSignature(type) {
-            if (type.flags & 131072) {
+            if (type.flags & 131072 /* Object */) {
                 var resolved = resolveStructuredTypeMembers(type);
                 if (resolved.callSignatures.length === 1 && resolved.constructSignatures.length === 0 &&
                     resolved.properties.length === 0 && !resolved.stringIndexInfo && !resolved.numberIndexInfo) {
@@ -35563,42 +45339,66 @@ var ts;
             }
             return undefined;
         }
+        // Instantiate a generic signature in the context of a non-generic signature (section 3.8.5 in TypeScript spec)
         function instantiateSignatureInContextOf(signature, contextualSignature, contextualMapper, compareTypes) {
-            var context = createInferenceContext(signature.typeParameters, signature, 1, compareTypes);
+            var context = createInferenceContext(signature.typeParameters, signature, 1 /* InferUnionTypes */, compareTypes);
             forEachMatchingParameterType(contextualSignature, signature, function (source, target) {
+                // Type parameters from outer context referenced by source type are fixed by instantiation of the source type
                 inferTypes(context.inferences, instantiateType(source, contextualMapper || identityMapper), target);
             });
             if (!contextualMapper) {
-                inferTypes(context.inferences, getReturnTypeOfSignature(contextualSignature), getReturnTypeOfSignature(signature), 8);
+                inferTypes(context.inferences, getReturnTypeOfSignature(contextualSignature), getReturnTypeOfSignature(signature), 8 /* ReturnType */);
             }
             return getSignatureInstantiation(signature, getInferredTypes(context), ts.isInJavaScriptFile(contextualSignature.declaration));
         }
         function inferJsxTypeArguments(signature, node, context) {
+            // Skip context sensitive pass
             var skipContextParamType = getTypeAtPosition(signature, 0);
             var checkAttrTypeSkipContextSensitive = checkExpressionWithContextualType(node.attributes, skipContextParamType, identityMapper);
             inferTypes(context.inferences, checkAttrTypeSkipContextSensitive, skipContextParamType);
+            // Standard pass
             var paramType = getTypeAtPosition(signature, 0);
             var checkAttrType = checkExpressionWithContextualType(node.attributes, paramType, context);
             inferTypes(context.inferences, checkAttrType, paramType);
             return getInferredTypes(context);
         }
         function inferTypeArguments(node, signature, args, excludeArgument, context) {
+            // Clear out all the inference results from the last time inferTypeArguments was called on this context
             for (var _i = 0, _a = context.inferences; _i < _a.length; _i++) {
                 var inference = _a[_i];
+                // As an optimization, we don't have to clear (and later recompute) inferred types
+                // for type parameters that have already been fixed on the previous call to inferTypeArguments.
+                // It would be just as correct to reset all of them. But then we'd be repeating the same work
+                // for the type parameters that were fixed, namely the work done by getInferredType.
                 if (!inference.isFixed) {
                     inference.inferredType = undefined;
                 }
             }
-            if (node.kind !== 150) {
+            // If a contextual type is available, infer from that type to the return type of the call expression. For
+            // example, given a 'function wrap<T, U>(cb: (x: T) => U): (x: T) => U' and a call expression
+            // 'let f: (x: string) => number = wrap(s => s.length)', we infer from the declared type of 'f' to the
+            // return type of 'wrap'.
+            if (node.kind !== 150 /* Decorator */) {
                 var contextualType = getContextualType(node);
                 if (contextualType) {
+                    // We clone the contextual mapper to avoid disturbing a resolution in progress for an
+                    // outer call expression. Effectively we just want a snapshot of whatever has been
+                    // inferred for any outer call expression so far.
                     var instantiatedType = instantiateType(contextualType, cloneTypeMapper(getContextualMapper(node)));
+                    // If the contextual type is a generic function type with a single call signature, we
+                    // instantiate the type with its own type parameters and type arguments. This ensures that
+                    // the type parameters are not erased to type any during type inference such that they can
+                    // be inferred as actual types from the contextual type. For example:
+                    //   declare function arrayMap<T, U>(f: (x: T) => U): (a: T[]) => U[];
+                    //   const boxElements: <A>(a: A[]) => { value: A }[] = arrayMap(value => ({ value }));
+                    // Above, the type of the 'value' parameter is inferred to be 'A'.
                     var contextualSignature = getSingleCallSignature(instantiatedType);
                     var inferenceSourceType = contextualSignature && contextualSignature.typeParameters ?
                         getOrCreateTypeFromSignature(getSignatureInstantiation(contextualSignature, contextualSignature.typeParameters, ts.isInJavaScriptFile(node))) :
                         instantiatedType;
                     var inferenceTargetType = getReturnTypeOfSignature(signature);
-                    inferTypes(context.inferences, inferenceSourceType, inferenceTargetType, 8);
+                    // Inferences made from return types have lower priority than all other inferences.
+                    inferTypes(context.inferences, inferenceSourceType, inferenceTargetType, 8 /* ReturnType */);
                 }
             }
             var thisType = getThisTypeOfSignature(signature);
@@ -35607,21 +45407,34 @@ var ts;
                 var thisArgumentType = thisArgumentNode ? checkExpression(thisArgumentNode) : voidType;
                 inferTypes(context.inferences, thisArgumentType, thisType);
             }
+            // We perform two passes over the arguments. In the first pass we infer from all arguments, but use
+            // wildcards for all context sensitive function expressions.
             var argCount = getEffectiveArgumentCount(node, args, signature);
             for (var i = 0; i < argCount; i++) {
                 var arg = getEffectiveArgument(node, args, i);
-                if (arg === undefined || arg.kind !== 206) {
+                // If the effective argument is 'undefined', then it is an argument that is present but is synthetic.
+                if (arg === undefined || arg.kind !== 206 /* OmittedExpression */) {
                     var paramType = getTypeAtPosition(signature, i);
                     var argType = getEffectiveArgumentType(node, i);
+                    // If the effective argument type is 'undefined', there is no synthetic type
+                    // for the argument. In that case, we should check the argument.
                     if (argType === undefined) {
+                        // For context sensitive arguments we pass the identityMapper, which is a signal to treat all
+                        // context sensitive function expressions as wildcards
                         var mapper = excludeArgument && excludeArgument[i] !== undefined ? identityMapper : context;
                         argType = checkExpressionWithContextualType(arg, paramType, mapper);
                     }
                     inferTypes(context.inferences, argType, paramType);
                 }
             }
+            // In the second pass we visit only context sensitive arguments, and only those that aren't excluded, this
+            // time treating function expressions normally (which may cause previously inferred type arguments to be fixed
+            // as we construct types for contextually typed parameters)
+            // Decorators will not have `excludeArgument`, as their arguments cannot be contextually typed.
+            // Tagged template expressions will always have `undefined` for `excludeArgument[0]`.
             if (excludeArgument) {
                 for (var i = 0; i < argCount; i++) {
+                    // No need to check for omitted args and template expressions, their exclusion value is always undefined
                     if (excludeArgument[i] === false) {
                         var arg = args[i];
                         var paramType = getTypeAtPosition(signature, i);
@@ -35641,7 +45454,7 @@ var ts;
                 var constraint = getConstraintOfTypeParameter(typeParameters[i]);
                 if (!constraint)
                     continue;
-                var errorInfo = reportErrors && headMessage ? (function () { return ts.chainDiagnosticMessages(undefined, ts.Diagnostics.Type_0_does_not_satisfy_the_constraint_1); }) : undefined;
+                var errorInfo = reportErrors && headMessage ? (function () { return ts.chainDiagnosticMessages(/*details*/ undefined, ts.Diagnostics.Type_0_does_not_satisfy_the_constraint_1); }) : undefined;
                 var typeArgumentHeadMessage = headMessage || ts.Diagnostics.Type_0_does_not_satisfy_the_constraint_1;
                 if (!mapper) {
                     mapper = createTypeMapper(typeParameters, typeArgumentTypes);
@@ -35653,14 +45466,29 @@ var ts;
             }
             return typeArgumentTypes;
         }
+        /**
+         * Check if the given signature can possibly be a signature called by the JSX opening-like element.
+         * @param node a JSX opening-like element we are trying to figure its call signature
+         * @param signature a candidate signature we are trying whether it is a call signature
+         * @param relation a relationship to check parameter and argument type
+         * @param excludeArgument
+         */
         function checkApplicableSignatureForJsxOpeningLikeElement(node, signature, relation) {
-            var callIsIncomplete = node.attributes.end === node.end;
+            // JSX opening-like element has correct arity for stateless-function component if the one of the following condition is true:
+            //      1. callIsIncomplete
+            //      2. attributes property has same number of properties as the parameter object type.
+            //         We can figure that out by resolving attributes property and check number of properties in the resolved type
+            // If the call has correct arity, we will then check if the argument type and parameter type is assignable
+            var callIsIncomplete = node.attributes.end === node.end; // If we are missing the close "/>", the call is incomplete
             if (callIsIncomplete) {
                 return true;
             }
             var headMessage = ts.Diagnostics.Argument_of_type_0_is_not_assignable_to_parameter_of_type_1;
+            // Stateless function components can have maximum of three arguments: "props", "context", and "updater".
+            // However "context" and "updater" are implicit and can't be specify by users. Only the first parameter, props,
+            // can be specified by users through attributes property.
             var paramType = getTypeAtPosition(signature, 0);
-            var attributesType = checkExpressionWithContextualType(node.attributes, paramType, undefined);
+            var attributesType = checkExpressionWithContextualType(node.attributes, paramType, /*contextualMapper*/ undefined);
             var argProperties = getPropertiesOfType(attributesType);
             for (var _i = 0, argProperties_1 = argProperties; _i < argProperties_1.length; _i++) {
                 var arg = argProperties_1[_i];
@@ -35668,14 +45496,17 @@ var ts;
                     return false;
                 }
             }
-            return checkTypeRelatedTo(attributesType, paramType, relation, undefined, headMessage);
+            return checkTypeRelatedTo(attributesType, paramType, relation, /*errorNode*/ undefined, headMessage);
         }
         function checkApplicableSignature(node, args, signature, relation, excludeArgument, reportErrors) {
             if (ts.isJsxOpeningLikeElement(node)) {
                 return checkApplicableSignatureForJsxOpeningLikeElement(node, signature, relation);
             }
             var thisType = getThisTypeOfSignature(signature);
-            if (thisType && thisType !== voidType && node.kind !== 188) {
+            if (thisType && thisType !== voidType && node.kind !== 188 /* NewExpression */) {
+                // If the called expression is not of the form `x.f` or `x["f"]`, then sourceType = voidType
+                // If the signature's 'this' type is voidType, then the check is skipped -- anything is compatible.
+                // If the expression is a new expression, then the check is skipped.
                 var thisArgumentNode = getThisArgumentOfCall(node);
                 var thisArgumentType = thisArgumentNode ? checkExpression(thisArgumentNode) : voidType;
                 var errorNode = reportErrors ? (thisArgumentNode || node) : undefined;
@@ -35688,11 +45519,19 @@ var ts;
             var argCount = getEffectiveArgumentCount(node, args, signature);
             for (var i = 0; i < argCount; i++) {
                 var arg = getEffectiveArgument(node, args, i);
-                if (arg === undefined || arg.kind !== 206) {
+                // If the effective argument is 'undefined', then it is an argument that is present but is synthetic.
+                if (arg === undefined || arg.kind !== 206 /* OmittedExpression */) {
+                    // Check spread elements against rest type (from arity check we know spread argument corresponds to a rest parameter)
                     var paramType = getTypeAtPosition(signature, i);
+                    // If the effective argument type is undefined, there is no synthetic type for the argument.
+                    // In that case, we should check the argument.
                     var argType = getEffectiveArgumentType(node, i) ||
                         checkExpressionWithContextualType(arg, paramType, excludeArgument && excludeArgument[i] ? identityMapper : undefined);
+                    // If one or more arguments are still excluded (as indicated by a non-null excludeArgument parameter),
+                    // we obtain the regular type of any object literal arguments because we may not have inferred complete
+                    // parameter types yet and therefore excess property checks may yield false positives (see #17041).
                     var checkArgType = excludeArgument ? getRegularTypeOfObjectLiteral(argType) : argType;
+                    // Use argument expression as error location when reporting errors
                     var errorNode = reportErrors ? getEffectiveArgumentErrorNode(node, i, arg) : undefined;
                     if (!checkTypeRelatedTo(checkArgType, paramType, relation, errorNode, headMessage)) {
                         return false;
@@ -35701,26 +45540,41 @@ var ts;
             }
             return true;
         }
+        /**
+         * Returns the this argument in calls like x.f(...) and x[f](...). Undefined otherwise.
+         */
         function getThisArgumentOfCall(node) {
-            if (node.kind === 187) {
+            if (node.kind === 187 /* CallExpression */) {
                 var callee = ts.skipOuterExpressions(node.expression);
-                if (callee.kind === 185 || callee.kind === 186) {
+                if (callee.kind === 185 /* PropertyAccessExpression */ || callee.kind === 186 /* ElementAccessExpression */) {
                     return callee.expression;
                 }
             }
         }
+        /**
+         * Returns the effective arguments for an expression that works like a function invocation.
+         *
+         * If 'node' is a CallExpression or a NewExpression, then its argument list is returned.
+         * If 'node' is a TaggedTemplateExpression, a new argument list is constructed from the substitution
+         *    expressions, where the first element of the list is `undefined`.
+         * If 'node' is a Decorator, the argument list will be `undefined`, and its arguments and types
+         *    will be supplied from calls to `getEffectiveArgumentCount` and `getEffectiveArgumentType`.
+         */
         function getEffectiveCallArguments(node) {
-            if (node.kind === 189) {
+            if (node.kind === 189 /* TaggedTemplateExpression */) {
                 var template = node.template;
-                var args_4 = [undefined];
-                if (template.kind === 202) {
+                var args_1 = [undefined]; // TODO: GH#18217
+                if (template.kind === 202 /* TemplateExpression */) {
                     ts.forEach(template.templateSpans, function (span) {
-                        args_4.push(span.expression);
+                        args_1.push(span.expression);
                     });
                 }
-                return args_4;
+                return args_1;
             }
-            else if (node.kind === 150) {
+            else if (node.kind === 150 /* Decorator */) {
+                // For a decorator, we return undefined as we will determine
+                // the number and types of arguments for a decorator using
+                // `getEffectiveArgumentCount` and `getEffectiveArgumentType` below.
                 return undefined;
             }
             else if (ts.isJsxOpeningLikeElement(node)) {
@@ -35730,22 +45584,45 @@ var ts;
                 return node.arguments || ts.emptyArray;
             }
         }
+        /**
+         * Returns the effective argument count for a node that works like a function invocation.
+         * If 'node' is a Decorator, the number of arguments is derived from the decoration
+         *    target and the signature:
+         *    If 'node.target' is a class declaration or class expression, the effective argument
+         *       count is 1.
+         *    If 'node.target' is a parameter declaration, the effective argument count is 3.
+         *    If 'node.target' is a property declaration, the effective argument count is 2.
+         *    If 'node.target' is a method or accessor declaration, the effective argument count
+         *       is 3, although it can be 2 if the signature only accepts two arguments, allowing
+         *       us to match a property decorator.
+         * Otherwise, the argument count is the length of the 'args' array.
+         */
         function getEffectiveArgumentCount(node, args, signature) {
-            if (node.kind === 150) {
+            if (node.kind === 150 /* Decorator */) {
                 switch (node.parent.kind) {
-                    case 235:
-                    case 205:
+                    case 235 /* ClassDeclaration */:
+                    case 205 /* ClassExpression */:
+                        // A class decorator will have one argument (see `ClassDecorator` in core.d.ts)
                         return 1;
-                    case 152:
+                    case 152 /* PropertyDeclaration */:
+                        // A property declaration decorator will have two arguments (see
+                        // `PropertyDecorator` in core.d.ts)
                         return 2;
-                    case 154:
-                    case 156:
-                    case 157:
-                        if (languageVersion === 0) {
+                    case 154 /* MethodDeclaration */:
+                    case 156 /* GetAccessor */:
+                    case 157 /* SetAccessor */:
+                        // A method or accessor declaration decorator will have two or three arguments (see
+                        // `PropertyDecorator` and `MethodDecorator` in core.d.ts)
+                        // If we are emitting decorators for ES3, we will only pass two arguments.
+                        if (languageVersion === 0 /* ES3 */) {
                             return 2;
                         }
+                        // If the method decorator signature only accepts a target and a key, we will only
+                        // type check those arguments.
                         return signature.parameters.length >= 3 ? 3 : 2;
-                    case 149:
+                    case 149 /* Parameter */:
+                        // A parameter declaration decorator will have three arguments (see
+                        // `ParameterDecorator` in core.d.ts)
                         return 3;
                     default:
                         return ts.Debug.fail();
@@ -35755,53 +45632,97 @@ var ts;
                 return args.length;
             }
         }
+        /**
+         * Returns the effective type of the first argument to a decorator.
+         * If 'node' is a class declaration or class expression, the effective argument type
+         *    is the type of the static side of the class.
+         * If 'node' is a parameter declaration, the effective argument type is either the type
+         *    of the static or instance side of the class for the parameter's parent method,
+         *    depending on whether the method is declared static.
+         *    For a constructor, the type is always the type of the static side of the class.
+         * If 'node' is a property, method, or accessor declaration, the effective argument
+         *    type is the type of the static or instance side of the parent class for class
+         *    element, depending on whether the element is declared static.
+         */
         function getEffectiveDecoratorFirstArgumentType(node) {
-            if (node.kind === 235) {
+            // The first argument to a decorator is its `target`.
+            if (node.kind === 235 /* ClassDeclaration */) {
+                // For a class decorator, the `target` is the type of the class (e.g. the
+                // "static" or "constructor" side of the class)
                 var classSymbol = getSymbolOfNode(node);
                 return getTypeOfSymbol(classSymbol);
             }
-            if (node.kind === 149) {
+            if (node.kind === 149 /* Parameter */) {
+                // For a parameter decorator, the `target` is the parent type of the
+                // parameter's containing method.
                 node = node.parent;
-                if (node.kind === 155) {
+                if (node.kind === 155 /* Constructor */) {
                     var classSymbol = getSymbolOfNode(node);
                     return getTypeOfSymbol(classSymbol);
                 }
             }
-            if (node.kind === 152 ||
-                node.kind === 154 ||
-                node.kind === 156 ||
-                node.kind === 157) {
+            if (node.kind === 152 /* PropertyDeclaration */ ||
+                node.kind === 154 /* MethodDeclaration */ ||
+                node.kind === 156 /* GetAccessor */ ||
+                node.kind === 157 /* SetAccessor */) {
+                // For a property or method decorator, the `target` is the
+                // "static"-side type of the parent of the member if the member is
+                // declared "static"; otherwise, it is the "instance"-side type of the
+                // parent of the member.
                 return getParentTypeOfClassElement(node);
             }
             ts.Debug.fail("Unsupported decorator target.");
             return errorType;
         }
+        /**
+         * Returns the effective type for the second argument to a decorator.
+         * If 'node' is a parameter, its effective argument type is one of the following:
+         *    If 'node.parent' is a constructor, the effective argument type is 'any', as we
+         *       will emit `undefined`.
+         *    If 'node.parent' is a member with an identifier, numeric, or string literal name,
+         *       the effective argument type will be a string literal type for the member name.
+         *    If 'node.parent' is a computed property name, the effective argument type will
+         *       either be a symbol type or the string type.
+         * If 'node' is a member with an identifier, numeric, or string literal name, the
+         *    effective argument type will be a string literal type for the member name.
+         * If 'node' is a computed property name, the effective argument type will either
+         *    be a symbol type or the string type.
+         * A class decorator does not have a second argument type.
+         */
         function getEffectiveDecoratorSecondArgumentType(node) {
-            if (node.kind === 235) {
+            // The second argument to a decorator is its `propertyKey`
+            if (node.kind === 235 /* ClassDeclaration */) {
                 ts.Debug.fail("Class decorators should not have a second synthetic argument.");
                 return errorType;
             }
-            if (node.kind === 149) {
+            if (node.kind === 149 /* Parameter */) {
                 node = node.parent;
-                if (node.kind === 155) {
+                if (node.kind === 155 /* Constructor */) {
+                    // For a constructor parameter decorator, the `propertyKey` will be `undefined`.
                     return anyType;
                 }
+                // For a non-constructor parameter decorator, the `propertyKey` will be either
+                // a string or a symbol, based on the name of the parameter's containing method.
             }
-            if (node.kind === 152 ||
-                node.kind === 154 ||
-                node.kind === 156 ||
-                node.kind === 157) {
+            if (node.kind === 152 /* PropertyDeclaration */ ||
+                node.kind === 154 /* MethodDeclaration */ ||
+                node.kind === 156 /* GetAccessor */ ||
+                node.kind === 157 /* SetAccessor */) {
+                // The `propertyKey` for a property or method decorator will be a
+                // string literal type if the member name is an identifier, number, or string;
+                // otherwise, if the member name is a computed property name it will
+                // be either string or symbol.
                 var element = node;
                 var name = element.name;
                 switch (name.kind) {
-                    case 71:
+                    case 71 /* Identifier */:
                         return getLiteralType(ts.idText(name));
-                    case 8:
-                    case 9:
+                    case 8 /* NumericLiteral */:
+                    case 9 /* StringLiteral */:
                         return getLiteralType(name.text);
-                    case 147:
+                    case 147 /* ComputedPropertyName */:
                         var nameType = checkComputedPropertyName(name);
-                        if (isTypeAssignableToKind(nameType, 3072)) {
+                        if (isTypeAssignableToKind(nameType, 3072 /* ESSymbolLike */)) {
                             return nameType;
                         }
                         else {
@@ -35815,27 +45736,42 @@ var ts;
             ts.Debug.fail("Unsupported decorator target.");
             return errorType;
         }
+        /**
+         * Returns the effective argument type for the third argument to a decorator.
+         * If 'node' is a parameter, the effective argument type is the number type.
+         * If 'node' is a method or accessor, the effective argument type is a
+         *    `TypedPropertyDescriptor<T>` instantiated with the type of the member.
+         * Class and property decorators do not have a third effective argument.
+         */
         function getEffectiveDecoratorThirdArgumentType(node) {
-            if (node.kind === 235) {
+            // The third argument to a decorator is either its `descriptor` for a method decorator
+            // or its `parameterIndex` for a parameter decorator
+            if (node.kind === 235 /* ClassDeclaration */) {
                 ts.Debug.fail("Class decorators should not have a third synthetic argument.");
                 return errorType;
             }
-            if (node.kind === 149) {
+            if (node.kind === 149 /* Parameter */) {
+                // The `parameterIndex` for a parameter decorator is always a number
                 return numberType;
             }
-            if (node.kind === 152) {
+            if (node.kind === 152 /* PropertyDeclaration */) {
                 ts.Debug.fail("Property decorators should not have a third synthetic argument.");
                 return errorType;
             }
-            if (node.kind === 154 ||
-                node.kind === 156 ||
-                node.kind === 157) {
-                var propertyType = getTypeOfNode(node);
+            if (node.kind === 154 /* MethodDeclaration */ ||
+                node.kind === 156 /* GetAccessor */ ||
+                node.kind === 157 /* SetAccessor */) {
+                // The `descriptor` for a method decorator will be a `TypedPropertyDescriptor<T>`
+                // for the type of the member.
+                var propertyType = getTypeOfNode(node); // TODO: GH#18217
                 return createTypedPropertyDescriptorType(propertyType);
             }
             ts.Debug.fail("Unsupported decorator target.");
             return errorType;
         }
+        /**
+         * Returns the effective argument type for the provided argument to a decorator.
+         */
         function getEffectiveDecoratorArgumentType(node, argIndex) {
             if (argIndex === 0) {
                 return getEffectiveDecoratorFirstArgumentType(node.parent);
@@ -35849,27 +45785,44 @@ var ts;
             ts.Debug.fail("Decorators should not have a fourth synthetic argument.");
             return errorType;
         }
+        /**
+         * Gets the effective argument type for an argument in a call expression.
+         */
         function getEffectiveArgumentType(node, argIndex) {
-            if (node.kind === 150) {
+            // Decorators provide special arguments, a tagged template expression provides
+            // a special first argument, and string literals get string literal types
+            // unless we're reporting errors
+            if (node.kind === 150 /* Decorator */) {
                 return getEffectiveDecoratorArgumentType(node, argIndex);
             }
-            else if (argIndex === 0 && node.kind === 189) {
+            else if (argIndex === 0 && node.kind === 189 /* TaggedTemplateExpression */) {
                 return getGlobalTemplateStringsArrayType();
             }
+            // This is not a synthetic argument, so we return 'undefined'
+            // to signal that the caller needs to check the argument.
             return undefined;
         }
+        /**
+         * Gets the effective argument expression for an argument in a call expression.
+         */
         function getEffectiveArgument(node, args, argIndex) {
-            if (node.kind === 150 ||
-                (argIndex === 0 && node.kind === 189)) {
+            // For a decorator or the first argument of a tagged template expression we return undefined.
+            if (node.kind === 150 /* Decorator */ ||
+                (argIndex === 0 && node.kind === 189 /* TaggedTemplateExpression */)) {
                 return undefined;
             }
             return args[argIndex];
         }
+        /**
+         * Gets the error node to use when reporting errors for an effective argument.
+         */
         function getEffectiveArgumentErrorNode(node, argIndex, arg) {
-            if (node.kind === 150) {
+            if (node.kind === 150 /* Decorator */) {
+                // For a decorator, we use the expression of the decorator for error reporting.
                 return node.expression;
             }
-            else if (argIndex === 0 && node.kind === 189) {
+            else if (argIndex === 0 && node.kind === 189 /* TaggedTemplateExpression */) {
+                // For a the first argument of a tagged template expression, we use the template of the tag for error reporting.
                 return node.template;
             }
             else {
@@ -35888,27 +45841,45 @@ var ts;
             return ts.createDiagnosticForNodeArray(ts.getSourceFileOfNode(node), typeArguments, ts.Diagnostics.Expected_0_type_arguments_but_got_1, paramCount, typeArguments.length);
         }
         function resolveCall(node, signatures, candidatesOutArray, fallbackError) {
-            var isTaggedTemplate = node.kind === 189;
-            var isDecorator = node.kind === 150;
+            var isTaggedTemplate = node.kind === 189 /* TaggedTemplateExpression */;
+            var isDecorator = node.kind === 150 /* Decorator */;
             var isJsxOpeningOrSelfClosingElement = ts.isJsxOpeningLikeElement(node);
             var typeArguments;
             if (!isDecorator) {
                 typeArguments = node.typeArguments;
-                if (isTaggedTemplate || isJsxOpeningOrSelfClosingElement || node.expression.kind !== 97) {
+                // We already perform checking on the type arguments on the class declaration itself.
+                if (isTaggedTemplate || isJsxOpeningOrSelfClosingElement || node.expression.kind !== 97 /* SuperKeyword */) {
                     ts.forEach(typeArguments, checkSourceElement);
                 }
             }
             var candidates = candidatesOutArray || [];
+            // reorderCandidates fills up the candidates array directly
             reorderCandidates(signatures, candidates);
             if (!candidates.length) {
                 diagnostics.add(ts.createDiagnosticForNode(node, ts.Diagnostics.Call_target_does_not_contain_any_signatures));
                 return resolveErrorCall(node);
             }
             var args = getEffectiveCallArguments(node);
+            // The following applies to any value of 'excludeArgument[i]':
+            //    - true:      the argument at 'i' is susceptible to a one-time permanent contextual typing.
+            //    - undefined: the argument at 'i' is *not* susceptible to permanent contextual typing.
+            //    - false:     the argument at 'i' *was* and *has been* permanently contextually typed.
+            //
+            // The idea is that we will perform type argument inference & assignability checking once
+            // without using the susceptible parameters that are functions, and once more for each of those
+            // parameters, contextually typing each as we go along.
+            //
+            // For a tagged template, then the first argument be 'undefined' if necessary
+            // because it represents a TemplateStringsArray.
+            //
+            // For a decorator, no arguments are susceptible to contextual typing due to the fact
+            // decorators are applied to a declaration by the emitter, and not to an expression.
             var isSingleNonGenericCandidate = candidates.length === 1 && !candidates[0].typeParameters;
             var excludeArgument;
             var excludeCount = 0;
             if (!isDecorator && !isSingleNonGenericCandidate) {
+                // We do not need to call `getEffectiveArgumentCount` here as it only
+                // applies when calculating the number of arguments for a decorator.
                 for (var i = isTaggedTemplate ? 1 : 0; i < args.length; i++) {
                     if (isContextSensitive(args[i])) {
                         if (!excludeArgument) {
@@ -35919,10 +45890,43 @@ var ts;
                     }
                 }
             }
+            // The following variables are captured and modified by calls to chooseOverload.
+            // If overload resolution or type argument inference fails, we want to report the
+            // best error possible. The best error is one which says that an argument was not
+            // assignable to a parameter. This implies that everything else about the overload
+            // was fine. So if there is any overload that is only incorrect because of an
+            // argument, we will report an error on that one.
+            //
+            //     function foo(s: string): void;
+            //     function foo(n: number): void; // Report argument error on this overload
+            //     function foo(): void;
+            //     foo(true);
+            //
+            // If none of the overloads even made it that far, there are two possibilities.
+            // There was a problem with type arguments for some overload, in which case
+            // report an error on that. Or none of the overloads even had correct arity,
+            // in which case give an arity error.
+            //
+            //     function foo<T extends string>(x: T): void; // Report type argument error
+            //     function foo(): void;
+            //     foo<number>(0);
+            //
             var candidateForArgumentError;
             var candidateForTypeArgumentError;
             var result;
-            var signatureHelpTrailingComma = candidatesOutArray && node.kind === 187 && node.arguments.hasTrailingComma;
+            // If we are in signature help, a trailing comma indicates that we intend to provide another argument,
+            // so we will only accept overloads with arity at least 1 higher than the current number of provided arguments.
+            var signatureHelpTrailingComma = candidatesOutArray && node.kind === 187 /* CallExpression */ && node.arguments.hasTrailingComma;
+            // Section 4.12.1:
+            // if the candidate list contains one or more signatures for which the type of each argument
+            // expression is a subtype of each corresponding parameter type, the return type of the first
+            // of those signatures becomes the return type of the function call.
+            // Otherwise, the return type of the first signature in the candidate list becomes the return
+            // type of the function call.
+            //
+            // Whether the call is an error is determined by assignability of the arguments. The subtype pass
+            // is just important for choosing the best signature. So in the case where there is only one
+            // signature, the subtype pass is useless. So skipping it is an optimization.
             if (candidates.length > 1) {
                 result = chooseOverload(candidates, subtypeRelation, signatureHelpTrailingComma);
             }
@@ -35932,14 +45936,24 @@ var ts;
             if (result) {
                 return result;
             }
+            // No signatures were applicable. Now report errors based on the last applicable signature with
+            // no arguments excluded from assignability checks.
+            // If candidate is undefined, it means that no candidates had a suitable arity. In that case,
+            // skip the checkApplicableSignature check.
             if (candidateForArgumentError) {
                 if (isJsxOpeningOrSelfClosingElement) {
+                    // We do not report any error here because any error will be handled in "resolveCustomJsxElementAttributesType".
                     return candidateForArgumentError;
                 }
-                checkApplicableSignature(node, args, candidateForArgumentError, assignableRelation, undefined, true);
+                // excludeArgument is undefined, in this case also equivalent to [undefined, undefined, ...]
+                // The importance of excludeArgument is to prevent us from typing function expression parameters
+                // in arguments too early. If possible, we'd like to only type them once we know the correct
+                // overload. However, this matters for the case where the call is correct. When the call is
+                // an error, we don't need to exclude any arguments, although it would cause no harm to do so.
+                checkApplicableSignature(node, args, candidateForArgumentError, assignableRelation, /*excludeArgument*/ undefined, /*reportErrors*/ true);
             }
             else if (candidateForTypeArgumentError) {
-                checkTypeArguments(candidateForTypeArgumentError, node.typeArguments, true, fallbackError);
+                checkTypeArguments(candidateForTypeArgumentError, node.typeArguments, /*reportErrors*/ true, fallbackError);
             }
             else if (typeArguments && ts.every(signatures, function (sig) { return ts.length(sig.typeParameters) !== typeArguments.length; })) {
                 diagnostics.add(getTypeArgumentArityError(node, signatures, typeArguments));
@@ -35970,13 +45984,21 @@ var ts;
             else if (fallbackError) {
                 diagnostics.add(ts.createDiagnosticForNode(node, fallbackError));
             }
+            // No signature was applicable. We have already reported the errors for the invalid signature.
+            // If this is a type resolution session, e.g. Language Service, try to get better information than anySignature.
+            // Pick the longest signature. This way we can get a contextual type for cases like:
+            //     declare function f(a: { xa: number; xb: number; }, b: number);
+            //     f({ |
+            // Also, use explicitly-supplied type arguments if they are provided, so we can get a contextual signature in cases like:
+            //     declare function f<T>(k: keyof T);
+            //     f<Foo>("
             if (!produceDiagnostics) {
-                ts.Debug.assert(candidates.length > 0);
+                ts.Debug.assert(candidates.length > 0); // Else would have exited above.
                 var bestIndex = getLongestCandidateIndex(candidates, apparentArgumentCount === undefined ? args.length : apparentArgumentCount);
                 var candidate = candidates[bestIndex];
                 var typeParameters = candidate.typeParameters;
                 if (typeParameters && callLikeExpressionMayHaveTypeArguments(node) && node.typeArguments) {
-                    var typeArguments_1 = node.typeArguments.map(getTypeOfNode);
+                    var typeArguments_1 = node.typeArguments.map(getTypeOfNode); // TODO: GH#18217
                     while (typeArguments_1.length > typeParameters.length) {
                         typeArguments_1.pop();
                     }
@@ -35999,7 +46021,7 @@ var ts;
                     if (!hasCorrectArity(node, args, candidate, signatureHelpTrailingComma)) {
                         return undefined;
                     }
-                    if (!checkApplicableSignature(node, args, candidate, relation, excludeArgument, false)) {
+                    if (!checkApplicableSignature(node, args, candidate, relation, excludeArgument, /*reportErrors*/ false)) {
                         candidateForArgumentError = candidate;
                         return undefined;
                     }
@@ -36012,14 +46034,14 @@ var ts;
                     }
                     var candidate = void 0;
                     var inferenceContext = originalCandidate.typeParameters ?
-                        createInferenceContext(originalCandidate.typeParameters, originalCandidate, ts.isInJavaScriptFile(node) ? 4 : 0) :
+                        createInferenceContext(originalCandidate.typeParameters, originalCandidate, /*flags*/ ts.isInJavaScriptFile(node) ? 4 /* AnyDefault */ : 0 /* None */) :
                         undefined;
                     while (true) {
                         candidate = originalCandidate;
                         if (candidate.typeParameters) {
                             var typeArgumentTypes = void 0;
                             if (typeArguments) {
-                                var typeArgumentResult = checkTypeArguments(candidate, typeArguments, false);
+                                var typeArgumentResult = checkTypeArguments(candidate, typeArguments, /*reportErrors*/ false);
                                 if (typeArgumentResult) {
                                     typeArgumentTypes = typeArgumentResult;
                                 }
@@ -36034,7 +46056,7 @@ var ts;
                             var isJavascript = ts.isInJavaScriptFile(candidate.declaration);
                             candidate = getSignatureInstantiation(candidate, typeArgumentTypes, isJavascript);
                         }
-                        if (!checkApplicableSignature(node, args, candidate, relation, excludeArgument, false)) {
+                        if (!checkApplicableSignature(node, args, candidate, relation, excludeArgument, /*reportErrors*/ false)) {
                             candidateForArgumentError = candidate;
                             break;
                         }
@@ -36044,7 +46066,7 @@ var ts;
                         }
                         excludeCount--;
                         if (excludeCount > 0) {
-                            excludeArgument[excludeArgument.indexOf(true)] = false;
+                            excludeArgument[excludeArgument.indexOf(/*value*/ true)] = false;
                         }
                         else {
                             excludeArgument = undefined;
@@ -36070,13 +46092,15 @@ var ts;
             return maxParamsIndex;
         }
         function resolveCallExpression(node, candidatesOutArray) {
-            if (node.expression.kind === 97) {
+            if (node.expression.kind === 97 /* SuperKeyword */) {
                 var superType = checkSuperExpression(node.expression);
                 if (isTypeAny(superType)) {
-                    ts.forEach(node.arguments, checkExpression);
+                    ts.forEach(node.arguments, checkExpresionNoReturn); // Still visit arguments so they get marked for visibility, etc
                     return anySignature;
                 }
                 if (superType !== errorType) {
+                    // In super call, the candidate signatures are the matching arity signatures of the base constructor function instantiated
+                    // with the type arguments specified in the extends clause.
                     var baseTypeNode = ts.getClassExtendsHeritageClauseElement(ts.getContainingClass(node));
                     if (baseTypeNode) {
                         var baseConstructors = getInstantiatedConstructorsForTypeArguments(superType, baseTypeNode.typeArguments, baseTypeNode);
@@ -36091,33 +46115,52 @@ var ts;
             }
             var apparentType = getApparentType(funcType);
             if (apparentType === errorType) {
+                // Another error has already been reported
                 return resolveErrorCall(node);
             }
-            var callSignatures = getSignaturesOfType(apparentType, 0);
-            var constructSignatures = getSignaturesOfType(apparentType, 1);
+            // Technically, this signatures list may be incomplete. We are taking the apparent type,
+            // but we are not including call signatures that may have been added to the Object or
+            // Function interface, since they have none by default. This is a bit of a leap of faith
+            // that the user will not add any.
+            var callSignatures = getSignaturesOfType(apparentType, 0 /* Call */);
+            var constructSignatures = getSignaturesOfType(apparentType, 1 /* Construct */);
+            // TS 1.0 Spec: 4.12
+            // In an untyped function call no TypeArgs are permitted, Args can be any argument list, no contextual
+            // types are provided for the argument expressions, and the result is always of type Any.
             if (isUntypedFunctionCall(funcType, apparentType, callSignatures.length, constructSignatures.length)) {
+                // The unknownType indicates that an error already occurred (and was reported).  No
+                // need to report another error in this case.
                 if (funcType !== errorType && node.typeArguments) {
                     error(node, ts.Diagnostics.Untyped_function_calls_may_not_accept_type_arguments);
                 }
                 return resolveUntypedCall(node);
             }
+            // If FuncExpr's apparent type(section 3.8.1) is a function type, the call is a typed function call.
+            // TypeScript employs overload resolution in typed function calls in order to support functions
+            // with multiple call signatures.
             if (!callSignatures.length) {
                 if (constructSignatures.length) {
                     error(node, ts.Diagnostics.Value_of_type_0_is_not_callable_Did_you_mean_to_include_new, typeToString(funcType));
                 }
                 else {
-                    invocationError(node, apparentType, 0);
+                    invocationError(node, apparentType, 0 /* Call */);
                 }
                 return resolveErrorCall(node);
             }
             return resolveCall(node, callSignatures, candidatesOutArray);
         }
+        /**
+         * TS 1.0 spec: 4.12
+         * If FuncExpr is of type Any, or of an object type that has no call or construct signatures
+         * but is a subtype of the Function interface, the call is an untyped function call.
+         */
         function isUntypedFunctionCall(funcType, apparentFuncType, numCallSignatures, numConstructSignatures) {
-            return isTypeAny(funcType) || isTypeAny(apparentFuncType) && funcType.flags & 65536 ||
-                !numCallSignatures && !numConstructSignatures && !(apparentFuncType.flags & (262144 | 32768)) && isTypeAssignableTo(funcType, globalFunctionType);
+            // We exclude union types because we may have a union of function types that happen to have no common signatures.
+            return isTypeAny(funcType) || isTypeAny(apparentFuncType) && funcType.flags & 65536 /* TypeParameter */ ||
+                !numCallSignatures && !numConstructSignatures && !(apparentFuncType.flags & (262144 /* Union */ | 32768 /* Never */)) && isTypeAssignableTo(funcType, globalFunctionType);
         }
         function resolveNewExpression(node, candidatesOutArray) {
-            if (node.arguments && languageVersion < 1) {
+            if (node.arguments && languageVersion < 1 /* ES5 */) {
                 var spreadIndex = getSpreadArgumentIndex(node.arguments);
                 if (spreadIndex >= 0) {
                     error(node.arguments[spreadIndex], ts.Diagnostics.Spread_operator_in_new_expressions_is_only_available_when_targeting_ECMAScript_5_and_higher);
@@ -36127,29 +46170,50 @@ var ts;
             if (expressionType === silentNeverType) {
                 return silentNeverSignature;
             }
+            // If expressionType's apparent type(section 3.8.1) is an object type with one or
+            // more construct signatures, the expression is processed in the same manner as a
+            // function call, but using the construct signatures as the initial set of candidate
+            // signatures for overload resolution. The result type of the function call becomes
+            // the result type of the operation.
             expressionType = getApparentType(expressionType);
             if (expressionType === errorType) {
+                // Another error has already been reported
                 return resolveErrorCall(node);
             }
+            // TS 1.0 spec: 4.11
+            // If expressionType is of type Any, Args can be any argument
+            // list and the result of the operation is of type Any.
             if (isTypeAny(expressionType)) {
                 if (node.typeArguments) {
                     error(node, ts.Diagnostics.Untyped_function_calls_may_not_accept_type_arguments);
                 }
                 return resolveUntypedCall(node);
             }
-            var constructSignatures = getSignaturesOfType(expressionType, 1);
+            // Technically, this signatures list may be incomplete. We are taking the apparent type,
+            // but we are not including construct signatures that may have been added to the Object or
+            // Function interface, since they have none by default. This is a bit of a leap of faith
+            // that the user will not add any.
+            var constructSignatures = getSignaturesOfType(expressionType, 1 /* Construct */);
             if (constructSignatures.length) {
                 if (!isConstructorAccessible(node, constructSignatures[0])) {
                     return resolveErrorCall(node);
                 }
+                // If the expression is a class of abstract type, then it cannot be instantiated.
+                // Note, only class declarations can be declared abstract.
+                // In the case of a merged class-module or class-interface declaration,
+                // only the class declaration node will have the Abstract flag set.
                 var valueDecl = expressionType.symbol && ts.getClassLikeDeclarationOfSymbol(expressionType.symbol);
-                if (valueDecl && ts.hasModifier(valueDecl, 128)) {
+                if (valueDecl && ts.hasModifier(valueDecl, 128 /* Abstract */)) {
                     error(node, ts.Diagnostics.Cannot_create_an_instance_of_an_abstract_class);
                     return resolveErrorCall(node);
                 }
                 return resolveCall(node, constructSignatures, candidatesOutArray);
             }
-            var callSignatures = getSignaturesOfType(expressionType, 0);
+            // If expressionType's apparent type is an object type with no construct signatures but
+            // one or more call signatures, the expression is processed as a function call. A compile-time
+            // error occurs if the result of the function call is not Void. The type of the result of the
+            // operation is Any. It is an error to have a Void this type.
+            var callSignatures = getSignaturesOfType(expressionType, 0 /* Call */);
             if (callSignatures.length) {
                 var signature = resolveCall(node, callSignatures, candidatesOutArray);
                 if (!isJavaScriptConstructor(signature.declaration) && getReturnTypeOfSignature(signature) !== voidType) {
@@ -36160,7 +46224,7 @@ var ts;
                 }
                 return signature;
             }
-            invocationError(node, expressionType, 1);
+            invocationError(node, expressionType, 1 /* Construct */);
             return resolveErrorCall(node);
         }
         function isConstructorAccessible(node, signature) {
@@ -36168,12 +46232,14 @@ var ts;
                 return true;
             }
             var declaration = signature.declaration;
-            var modifiers = ts.getSelectedModifierFlags(declaration, 24);
+            var modifiers = ts.getSelectedModifierFlags(declaration, 24 /* NonPublicAccessibilityModifier */);
+            // Public constructor is accessible.
             if (!modifiers) {
                 return true;
             }
             var declaringClassDeclaration = ts.getClassLikeDeclarationOfSymbol(declaration.parent.symbol);
             var declaringClass = getDeclaredTypeOfSymbol(declaration.parent.symbol);
+            // A private or protected constructor can only be instantiated within its own class (or a subclass, for protected)
             if (!isNodeWithinClass(node, declaringClassDeclaration)) {
                 var containingClass = ts.getContainingClass(node);
                 if (containingClass) {
@@ -36181,17 +46247,17 @@ var ts;
                     var baseTypes = getBaseTypes(containingType);
                     while (baseTypes.length) {
                         var baseType = baseTypes[0];
-                        if (modifiers & 16 &&
+                        if (modifiers & 16 /* Protected */ &&
                             baseType.symbol === declaration.parent.symbol) {
                             return true;
                         }
                         baseTypes = getBaseTypes(baseType);
                     }
                 }
-                if (modifiers & 8) {
+                if (modifiers & 8 /* Private */) {
                     error(node, ts.Diagnostics.Constructor_of_class_0_is_private_and_only_accessible_within_the_class_declaration, typeToString(declaringClass));
                 }
-                if (modifiers & 16) {
+                if (modifiers & 16 /* Protected */) {
                     error(node, ts.Diagnostics.Constructor_of_class_0_is_protected_and_only_accessible_within_the_class_declaration, typeToString(declaringClass));
                 }
                 return false;
@@ -36199,7 +46265,7 @@ var ts;
             return true;
         }
         function invocationError(node, apparentType, kind) {
-            error(node, kind === 0
+            error(node, kind === 0 /* Call */
                 ? ts.Diagnostics.Cannot_invoke_an_expression_whose_type_lacks_a_call_signature_Type_0_has_no_compatible_call_signatures
                 : ts.Diagnostics.Cannot_use_new_with_an_expression_whose_type_lacks_a_call_or_construct_signature, typeToString(apparentType));
             invocationErrorRecovery(apparentType, kind);
@@ -36209,6 +46275,8 @@ var ts;
                 return;
             }
             var importNode = getSymbolLinks(apparentType.symbol).originatingImport;
+            // Create a diagnostic on the originating import if possible onto which we can attach a quickfix
+            //  An import call expression cannot be rewritten into another form to correct the error - the only solution is to use `.default` at the use-site
             if (importNode && !ts.isImportCall(importNode)) {
                 var sigs = getSignaturesOfType(getTypeOfSymbol(getSymbolLinks(apparentType.symbol).target), kind);
                 if (!sigs || !sigs.length)
@@ -36220,72 +46288,94 @@ var ts;
             var tagType = checkExpression(node.tag);
             var apparentType = getApparentType(tagType);
             if (apparentType === errorType) {
+                // Another error has already been reported
                 return resolveErrorCall(node);
             }
-            var callSignatures = getSignaturesOfType(apparentType, 0);
-            var constructSignatures = getSignaturesOfType(apparentType, 1);
+            var callSignatures = getSignaturesOfType(apparentType, 0 /* Call */);
+            var constructSignatures = getSignaturesOfType(apparentType, 1 /* Construct */);
             if (isUntypedFunctionCall(tagType, apparentType, callSignatures.length, constructSignatures.length)) {
                 return resolveUntypedCall(node);
             }
             if (!callSignatures.length) {
-                invocationError(node, apparentType, 0);
+                invocationError(node, apparentType, 0 /* Call */);
                 return resolveErrorCall(node);
             }
             return resolveCall(node, callSignatures, candidatesOutArray);
         }
+        /**
+         * Gets the localized diagnostic head message to use for errors when resolving a decorator as a call expression.
+         */
         function getDiagnosticHeadMessageForDecoratorResolution(node) {
             switch (node.parent.kind) {
-                case 235:
-                case 205:
+                case 235 /* ClassDeclaration */:
+                case 205 /* ClassExpression */:
                     return ts.Diagnostics.Unable_to_resolve_signature_of_class_decorator_when_called_as_an_expression;
-                case 149:
+                case 149 /* Parameter */:
                     return ts.Diagnostics.Unable_to_resolve_signature_of_parameter_decorator_when_called_as_an_expression;
-                case 152:
+                case 152 /* PropertyDeclaration */:
                     return ts.Diagnostics.Unable_to_resolve_signature_of_property_decorator_when_called_as_an_expression;
-                case 154:
-                case 156:
-                case 157:
+                case 154 /* MethodDeclaration */:
+                case 156 /* GetAccessor */:
+                case 157 /* SetAccessor */:
                     return ts.Diagnostics.Unable_to_resolve_signature_of_method_decorator_when_called_as_an_expression;
                 default:
                     return ts.Debug.fail();
             }
         }
+        /**
+         * Resolves a decorator as if it were a call expression.
+         */
         function resolveDecorator(node, candidatesOutArray) {
             var funcType = checkExpression(node.expression);
             var apparentType = getApparentType(funcType);
             if (apparentType === errorType) {
                 return resolveErrorCall(node);
             }
-            var callSignatures = getSignaturesOfType(apparentType, 0);
-            var constructSignatures = getSignaturesOfType(apparentType, 1);
+            var callSignatures = getSignaturesOfType(apparentType, 0 /* Call */);
+            var constructSignatures = getSignaturesOfType(apparentType, 1 /* Construct */);
             if (isUntypedFunctionCall(funcType, apparentType, callSignatures.length, constructSignatures.length)) {
                 return resolveUntypedCall(node);
             }
             if (isPotentiallyUncalledDecorator(node, callSignatures)) {
-                var nodeStr = ts.getTextOfNode(node.expression, false);
+                var nodeStr = ts.getTextOfNode(node.expression, /*includeTrivia*/ false);
                 error(node, ts.Diagnostics._0_accepts_too_few_arguments_to_be_used_as_a_decorator_here_Did_you_mean_to_call_it_first_and_write_0, nodeStr);
                 return resolveErrorCall(node);
             }
             var headMessage = getDiagnosticHeadMessageForDecoratorResolution(node);
             if (!callSignatures.length) {
-                var errorInfo = ts.chainDiagnosticMessages(undefined, ts.Diagnostics.Cannot_invoke_an_expression_whose_type_lacks_a_call_signature_Type_0_has_no_compatible_call_signatures, typeToString(apparentType));
+                var errorInfo = ts.chainDiagnosticMessages(/*details*/ undefined, ts.Diagnostics.Cannot_invoke_an_expression_whose_type_lacks_a_call_signature_Type_0_has_no_compatible_call_signatures, typeToString(apparentType));
                 errorInfo = ts.chainDiagnosticMessages(errorInfo, headMessage);
                 diagnostics.add(ts.createDiagnosticForNodeFromMessageChain(node, errorInfo));
-                invocationErrorRecovery(apparentType, 0);
+                invocationErrorRecovery(apparentType, 0 /* Call */);
                 return resolveErrorCall(node);
             }
             return resolveCall(node, callSignatures, candidatesOutArray, headMessage);
         }
+        /**
+         * Sometimes, we have a decorator that could accept zero arguments,
+         * but is receiving too many arguments as part of the decorator invocation.
+         * In those cases, a user may have meant to *call* the expression before using it as a decorator.
+         */
         function isPotentiallyUncalledDecorator(decorator, signatures) {
             return signatures.length && ts.every(signatures, function (signature) {
                 return signature.minArgumentCount === 0 &&
                     !signature.hasRestParameter &&
-                    signature.parameters.length < getEffectiveArgumentCount(decorator, undefined, signature);
+                    signature.parameters.length < getEffectiveArgumentCount(decorator, /*args*/ undefined, signature);
             });
         }
+        /**
+         * This function is similar to getResolvedSignature but is exclusively for trying to resolve JSX stateless-function component.
+         * The main reason we have to use this function instead of getResolvedSignature because, the caller of this function will already check the type of openingLikeElement's tagName
+         * and pass the type as elementType. The elementType can not be a union (as such case should be handled by the caller of this function)
+         * Note: at this point, we are still not sure whether the opening-like element is a stateless function component or not.
+         * @param openingLikeElement an opening-like JSX element to try to resolve as JSX stateless function
+         * @param elementType an element type of the opneing-like element by checking opening-like element's tagname.
+         * @param candidatesOutArray an array of signature to be filled in by the function. It is passed by signature help in the language service;
+         *                           the function will fill it up with appropriate candidate signatures
+         */
         function getResolvedJsxStatelessFunctionSignature(openingLikeElement, elementType, candidatesOutArray) {
-            ts.Debug.assert(!(elementType.flags & 262144));
-            var callSignatures = elementType && getSignaturesOfType(elementType, 0);
+            ts.Debug.assert(!(elementType.flags & 262144 /* Union */));
+            var callSignatures = elementType && getSignaturesOfType(elementType, 0 /* Call */);
             if (callSignatures && callSignatures.length > 0) {
                 return resolveCall(openingLikeElement, callSignatures, candidatesOutArray);
             }
@@ -36293,16 +46383,17 @@ var ts;
         }
         function resolveSignature(node, candidatesOutArray) {
             switch (node.kind) {
-                case 187:
+                case 187 /* CallExpression */:
                     return resolveCallExpression(node, candidatesOutArray);
-                case 188:
+                case 188 /* NewExpression */:
                     return resolveNewExpression(node, candidatesOutArray);
-                case 189:
+                case 189 /* TaggedTemplateExpression */:
                     return resolveTaggedTemplateExpression(node, candidatesOutArray);
-                case 150:
+                case 150 /* Decorator */:
                     return resolveDecorator(node, candidatesOutArray);
-                case 257:
-                case 256:
+                case 257 /* JsxOpeningElement */:
+                case 256 /* JsxSelfClosingElement */:
+                    // This code-path is called by language service
                     var exprTypes = checkExpression(node.tagName);
                     return forEachType(exprTypes, function (exprType) {
                         var sfcResult = getResolvedJsxStatelessFunctionSignature(node, exprType, candidatesOutArray);
@@ -36318,21 +46409,41 @@ var ts;
             }
             throw ts.Debug.assertNever(node, "Branch in 'resolveSignature' should be unreachable.");
         }
+        /**
+         * Resolve a signature of a given call-like expression.
+         * @param node a call-like expression to try resolve a signature for
+         * @param candidatesOutArray an array of signature to be filled in by the function. It is passed by signature help in the language service;
+         *                           the function will fill it up with appropriate candidate signatures
+         * @return a signature of the call-like expression or undefined if one can't be found
+         */
         function getResolvedSignature(node, candidatesOutArray) {
             var links = getNodeLinks(node);
+            // If getResolvedSignature has already been called, we will have cached the resolvedSignature.
+            // However, it is possible that either candidatesOutArray was not passed in the first time,
+            // or that a different candidatesOutArray was passed in. Therefore, we need to redo the work
+            // to correctly fill the candidatesOutArray.
             var cached = links.resolvedSignature;
             if (cached && cached !== resolvingSignature && !candidatesOutArray) {
                 return cached;
             }
             links.resolvedSignature = resolvingSignature;
             var result = resolveSignature(node, candidatesOutArray);
+            // If signature resolution originated in control flow type analysis (for example to compute the
+            // assigned type in a flow assignment) we don't cache the result as it may be based on temporary
+            // types from the control flow analysis.
             links.resolvedSignature = flowLoopStart === flowLoopCount ? result : cached;
             return result;
         }
+        /**
+         * Indicates whether a declaration can be treated as a constructor in a JavaScript
+         * file.
+         */
         function isJavaScriptConstructor(node) {
             if (node && ts.isInJavaScriptFile(node)) {
+                // If the node has a @class tag, treat it like a constructor.
                 if (ts.getJSDocClassTag(node))
                     return true;
+                // If the symbol of the node has members, treat it like a constructor.
                 var symbol = ts.isFunctionDeclaration(node) || ts.isFunctionExpression(node) ? getSymbolOfNode(node) :
                     ts.isVariableDeclaration(node) && node.initializer && ts.isFunctionExpression(node.initializer) ? getSymbolOfNode(node.initializer) :
                         undefined;
@@ -36371,10 +46482,10 @@ var ts;
                 return false;
             }
             var parent = node.parent;
-            while (parent && parent.kind === 185) {
+            while (parent && parent.kind === 185 /* PropertyAccessExpression */) {
                 parent = parent.parent;
             }
-            if (parent && ts.isBinaryExpression(parent) && ts.isPrototypeAccess(parent.left) && parent.operatorToken.kind === 58) {
+            if (parent && ts.isBinaryExpression(parent) && ts.isPrototypeAccess(parent.left) && parent.operatorToken.kind === 58 /* EqualsToken */) {
                 var right = ts.getInitializerOfBinaryExpression(parent);
                 return ts.isObjectLiteralExpression(right) && right;
             }
@@ -36382,31 +46493,41 @@ var ts;
         function getInferredClassType(symbol) {
             var links = getSymbolLinks(symbol);
             if (!links.inferredClassType) {
-                links.inferredClassType = createAnonymousType(symbol, getMembersOfSymbol(symbol) || emptySymbols, ts.emptyArray, ts.emptyArray, undefined, undefined);
+                links.inferredClassType = createAnonymousType(symbol, getMembersOfSymbol(symbol) || emptySymbols, ts.emptyArray, ts.emptyArray, /*stringIndexType*/ undefined, /*numberIndexType*/ undefined);
             }
             return links.inferredClassType;
         }
         function isInferredClassType(type) {
             return type.symbol
-                && ts.getObjectFlags(type) & 16
+                && ts.getObjectFlags(type) & 16 /* Anonymous */
                 && getSymbolLinks(type.symbol).inferredClassType === type;
         }
+        /**
+         * Syntactically and semantically checks a call or new expression.
+         * @param node The call/new expression to be checked.
+         * @returns On success, the expression's signature's return type. On failure, anyType.
+         */
         function checkCallExpression(node) {
             if (!checkGrammarTypeArguments(node, node.typeArguments))
                 checkGrammarArguments(node.arguments);
             var signature = getResolvedSignature(node);
-            if (node.expression.kind === 97) {
+            if (node.expression.kind === 97 /* SuperKeyword */) {
                 return voidType;
             }
-            if (node.kind === 188) {
+            if (node.kind === 188 /* NewExpression */) {
                 var declaration = signature.declaration;
                 if (declaration &&
-                    declaration.kind !== 155 &&
-                    declaration.kind !== 159 &&
-                    declaration.kind !== 164 &&
+                    declaration.kind !== 155 /* Constructor */ &&
+                    declaration.kind !== 159 /* ConstructSignature */ &&
+                    declaration.kind !== 164 /* ConstructorType */ &&
                     !ts.isJSDocConstructSignature(declaration)) {
+                    // When resolved signature is a call signature (and not a construct signature) the result type is any, unless
+                    // the declaring function had members created through 'x.prototype.y = expr' or 'this.y = expr' psuedodeclarations
+                    // in a JS file
+                    // Note:JS inferred classes might come from a variable declaration instead of a function declaration.
+                    // In this case, using getResolvedSymbol directly is required to avoid losing the members from the declaration.
                     var funcSymbol = checkExpression(node.expression).symbol;
-                    if (!funcSymbol && node.expression.kind === 71) {
+                    if (!funcSymbol && node.expression.kind === 71 /* Identifier */) {
                         funcSymbol = getResolvedSymbol(node.expression);
                     }
                     var type = funcSymbol && getJavaScriptClassType(funcSymbol);
@@ -36419,11 +46540,14 @@ var ts;
                     return anyType;
                 }
             }
+            // In JavaScript files, calls to any identifier 'require' are treated as external module imports
             if (ts.isInJavaScriptFile(node) && isCommonJsRequire(node)) {
                 return resolveExternalModuleTypeByLiteral(node.arguments[0]);
             }
             var returnType = getReturnTypeOfSignature(signature);
-            if (returnType.flags & 3072 && isSymbolOrSymbolForCall(node)) {
+            // Treat any call to the global 'Symbol' function that is part of a const variable or readonly property
+            // as a fresh unique symbol literal type.
+            if (returnType.flags & 3072 /* ESSymbolLike */ && isSymbolOrSymbolForCall(node)) {
                 return getESSymbolLikeTypeForNode(ts.walkUpParenthesizedExpressions(node.parent));
             }
             var jsAssignmentType;
@@ -36448,13 +46572,15 @@ var ts;
             if (!ts.isIdentifier(left) || left.escapedText !== "Symbol") {
                 return false;
             }
-            var globalESSymbol = getGlobalESSymbolConstructorSymbol(false);
+            // make sure `Symbol` is the global symbol
+            var globalESSymbol = getGlobalESSymbolConstructorSymbol(/*reportErrors*/ false);
             if (!globalESSymbol) {
                 return false;
             }
-            return globalESSymbol === resolveName(left, "Symbol", 67216319, undefined, undefined, false);
+            return globalESSymbol === resolveName(left, "Symbol", 67216319 /* Value */, /*nameNotFoundMessage*/ undefined, /*nameArg*/ undefined, /*isUse*/ false);
         }
         function checkImportCallExpression(node) {
+            // Check grammar of dynamic import
             if (!checkGrammarArguments(node.arguments))
                 checkGrammarImportCallExpression(node);
             if (node.arguments.length === 0) {
@@ -36462,15 +46588,17 @@ var ts;
             }
             var specifier = node.arguments[0];
             var specifierType = checkExpressionCached(specifier);
+            // Even though multiple arugments is grammatically incorrect, type-check extra arguments for completion
             for (var i = 1; i < node.arguments.length; ++i) {
                 checkExpressionCached(node.arguments[i]);
             }
-            if (specifierType.flags & 8192 || specifierType.flags & 16384 || !isTypeAssignableTo(specifierType, stringType)) {
+            if (specifierType.flags & 8192 /* Undefined */ || specifierType.flags & 16384 /* Null */ || !isTypeAssignableTo(specifierType, stringType)) {
                 error(specifier, ts.Diagnostics.Dynamic_import_s_specifier_must_be_of_type_string_but_here_has_type_0, typeToString(specifierType));
             }
+            // resolveExternalModuleName will return undefined if the moduleReferenceExpression is not a string literal
             var moduleSymbol = resolveExternalModuleName(node, specifier);
             if (moduleSymbol) {
-                var esModuleSymbol = resolveESModuleSymbol(moduleSymbol, specifier, true);
+                var esModuleSymbol = resolveESModuleSymbol(moduleSymbol, specifier, /*dontRecursivelyResolve*/ true);
                 if (esModuleSymbol) {
                     return createPromiseReturnType(node, getTypeWithSyntheticDefaultImportType(getTypeOfSymbol(esModuleSymbol), esModuleSymbol, moduleSymbol));
                 }
@@ -36481,17 +46609,17 @@ var ts;
             if (allowSyntheticDefaultImports && type && type !== errorType) {
                 var synthType = type;
                 if (!synthType.syntheticType) {
-                    var file_4 = ts.find(originalSymbol.declarations, ts.isSourceFile);
-                    var hasSyntheticDefault = canHaveSyntheticDefault(file_4, originalSymbol, false);
+                    var file = ts.find(originalSymbol.declarations, ts.isSourceFile);
+                    var hasSyntheticDefault = canHaveSyntheticDefault(file, originalSymbol, /*dontResolveAlias*/ false);
                     if (hasSyntheticDefault) {
                         var memberTable = ts.createSymbolTable();
-                        var newSymbol = createSymbol(2097152, "default");
+                        var newSymbol = createSymbol(2097152 /* Alias */, "default" /* Default */);
                         newSymbol.target = resolveSymbol(symbol);
-                        memberTable.set("default", newSymbol);
-                        var anonymousSymbol = createSymbol(2048, "__type");
-                        var defaultContainingObject = createAnonymousType(anonymousSymbol, memberTable, ts.emptyArray, ts.emptyArray, undefined, undefined);
+                        memberTable.set("default" /* Default */, newSymbol);
+                        var anonymousSymbol = createSymbol(2048 /* TypeLiteral */, "__type" /* Type */);
+                        var defaultContainingObject = createAnonymousType(anonymousSymbol, memberTable, ts.emptyArray, ts.emptyArray, /*stringIndexInfo*/ undefined, /*numberIndexInfo*/ undefined);
                         anonymousSymbol.type = defaultContainingObject;
-                        synthType.syntheticType = isValidSpreadType(type) ? getSpreadType(type, defaultContainingObject, anonymousSymbol, 0, 0) : defaultContainingObject;
+                        synthType.syntheticType = isValidSpreadType(type) ? getSpreadType(type, defaultContainingObject, anonymousSymbol, /*typeFLags*/ 0, /*objectFlags*/ 0) : defaultContainingObject;
                     }
                     else {
                         synthType.syntheticType = type;
@@ -36502,33 +46630,36 @@ var ts;
             return type;
         }
         function isCommonJsRequire(node) {
-            if (!ts.isRequireCall(node, true)) {
+            if (!ts.isRequireCall(node, /*checkArgumentIsStringLiteralLike*/ true)) {
                 return false;
             }
+            // Make sure require is not a local function
             if (!ts.isIdentifier(node.expression))
                 return ts.Debug.fail();
-            var resolvedRequire = resolveName(node.expression, node.expression.escapedText, 67216319, undefined, undefined, true);
+            var resolvedRequire = resolveName(node.expression, node.expression.escapedText, 67216319 /* Value */, /*nameNotFoundMessage*/ undefined, /*nameArg*/ undefined, /*isUse*/ true); // TODO: GH#18217
             if (resolvedRequire === requireSymbol) {
                 return true;
             }
-            if (resolvedRequire.flags & 2097152) {
+            // project includes symbol named 'require' - make sure that it is ambient and local non-alias
+            if (resolvedRequire.flags & 2097152 /* Alias */) {
                 return false;
             }
-            var targetDeclarationKind = resolvedRequire.flags & 16
-                ? 234
-                : resolvedRequire.flags & 3
-                    ? 232
-                    : 0;
-            if (targetDeclarationKind !== 0) {
+            var targetDeclarationKind = resolvedRequire.flags & 16 /* Function */
+                ? 234 /* FunctionDeclaration */
+                : resolvedRequire.flags & 3 /* Variable */
+                    ? 232 /* VariableDeclaration */
+                    : 0 /* Unknown */;
+            if (targetDeclarationKind !== 0 /* Unknown */) {
                 var decl = ts.getDeclarationOfKind(resolvedRequire, targetDeclarationKind);
-                return !!decl && !!(decl.flags & 4194304);
+                // function/variable declaration should be ambient
+                return !!decl && !!(decl.flags & 4194304 /* Ambient */);
             }
             return false;
         }
         function checkTaggedTemplateExpression(node) {
             checkGrammarTypeArguments(node, node.typeArguments);
-            if (languageVersion < 2) {
-                checkExternalEmitHelpers(node, 65536);
+            if (languageVersion < 2 /* ES2015 */) {
+                checkExternalEmitHelpers(node, 65536 /* MakeTemplateObject */);
             }
             return getReturnTypeOfSignature(getResolvedSignature(node));
         }
@@ -36552,10 +46683,10 @@ var ts;
         }
         function checkMetaProperty(node) {
             checkGrammarMetaProperty(node);
-            if (node.keywordToken === 94) {
+            if (node.keywordToken === 94 /* NewKeyword */) {
                 return checkNewTargetMetaProperty(node);
             }
-            if (node.keywordToken === 91) {
+            if (node.keywordToken === 91 /* ImportKeyword */) {
                 return checkImportMetaProperty(node);
             }
             return ts.Debug.assertNever(node.keywordToken);
@@ -36566,7 +46697,7 @@ var ts;
                 error(node, ts.Diagnostics.Meta_property_0_is_only_allowed_in_the_body_of_a_function_declaration_function_expression_or_constructor, "new.target");
                 return errorType;
             }
-            else if (container.kind === 155) {
+            else if (container.kind === 155 /* Constructor */) {
                 var symbol = getSymbolOfNode(container.parent);
                 return getTypeOfSymbol(symbol);
             }
@@ -36576,11 +46707,11 @@ var ts;
             }
         }
         function checkImportMetaProperty(node) {
-            if (languageVersion < 6 || moduleKind < ts.ModuleKind.ESNext) {
+            if (languageVersion < 6 /* ESNext */ || moduleKind < ts.ModuleKind.ESNext) {
                 error(node, ts.Diagnostics.The_import_meta_meta_property_is_only_allowed_using_ESNext_for_the_target_and_module_compiler_options);
             }
             var file = ts.getSourceFileOfNode(node);
-            ts.Debug.assert(!!(file.flags & 1048576), "Containing file is missing import meta node flag.");
+            ts.Debug.assert(!!(file.flags & 1048576 /* PossiblyContainsImportMeta */), "Containing file is missing import meta node flag.");
             ts.Debug.assert(!!file.externalModuleIndicator, "Containing file should be a module.");
             return node.name.escapedText === "meta" ? getGlobalImportMetaType() : errorType;
         }
@@ -36623,7 +46754,7 @@ var ts;
                 var parameter = signature.thisParameter;
                 if (!parameter || parameter.valueDeclaration && !parameter.valueDeclaration.type) {
                     if (!parameter) {
-                        signature.thisParameter = createSymbolWithType(context.thisParameter, undefined);
+                        signature.thisParameter = createSymbolWithType(context.thisParameter, /*type*/ undefined);
                     }
                     assignTypeToParameterAndFixTypeParameters(signature.thisParameter, getTypeOfSymbol(context.thisParameter));
                 }
@@ -36637,6 +46768,7 @@ var ts;
                 }
             }
             if (signature.hasRestParameter && isRestParameterIndex(context, signature.parameters.length - 1)) {
+                // parameter might be a transient symbol generated by use of `arguments` in the function body.
                 var parameter = ts.last(signature.parameters);
                 if (isTransientSymbol(parameter) || !ts.getEffectiveTypeAnnotationNode(parameter.valueDeclaration)) {
                     var contextualParameterType = getTypeOfSymbol(ts.last(context.parameters));
@@ -36644,11 +46776,13 @@ var ts;
                 }
             }
         }
+        // When contextual typing assigns a type to a parameter that contains a binding pattern, we also need to push
+        // the destructured type into the contained binding elements.
         function assignBindingElementTypes(pattern) {
             for (var _i = 0, _a = pattern.elements; _i < _a.length; _i++) {
                 var element = _a[_i];
                 if (!ts.isOmittedExpression(element)) {
-                    if (element.name.kind === 71) {
+                    if (element.name.kind === 71 /* Identifier */) {
                         getSymbolLinks(getSymbolOfNode(element)).type = getTypeForBindingElement(element);
                     }
                     else {
@@ -36662,7 +46796,8 @@ var ts;
             if (!links.type) {
                 links.type = contextualType;
                 var decl = parameter.valueDeclaration;
-                if (decl.name.kind !== 71) {
+                if (decl.name.kind !== 71 /* Identifier */) {
+                    // if inference didn't come up with anything but {}, fall back to the binding pattern if present.
                     if (links.type === emptyObjectType) {
                         links.type = getTypeFromBindingPattern(decl.name);
                     }
@@ -36671,8 +46806,10 @@ var ts;
             }
         }
         function createPromiseType(promisedType) {
-            var globalPromiseType = getGlobalPromiseType(true);
+            // creates a `Promise<T>` type where `T` is the promisedType argument
+            var globalPromiseType = getGlobalPromiseType(/*reportErrors*/ true);
             if (globalPromiseType !== emptyGenericType) {
+                // if the promised type is itself a promise, get the underlying type; otherwise, fallback to the promised type
                 promisedType = getAwaitedType(promisedType) || emptyObjectType;
                 return createTypeReference(globalPromiseType, [promisedType]);
             }
@@ -36686,7 +46823,7 @@ var ts;
                     ts.Diagnostics.An_async_function_or_method_must_return_a_Promise_Make_sure_you_have_a_declaration_for_Promise_or_include_ES2015_in_your_lib_option);
                 return errorType;
             }
-            else if (!getGlobalPromiseConstructorSymbol(true)) {
+            else if (!getGlobalPromiseConstructorSymbol(/*reportErrors*/ true)) {
                 error(func, ts.isImportCall(func) ?
                     ts.Diagnostics.A_dynamic_import_call_in_ES5_SlashES3_requires_the_Promise_constructor_Make_sure_you_have_a_declaration_for_the_Promise_constructor_or_include_ES2015_in_your_lib_option :
                     ts.Diagnostics.An_async_function_or_method_in_ES5_SlashES3_requires_the_Promise_constructor_Make_sure_you_have_a_declaration_for_the_Promise_constructor_or_include_ES2015_in_your_lib_option);
@@ -36699,20 +46836,24 @@ var ts;
             }
             var functionFlags = ts.getFunctionFlags(func);
             var type;
-            if (func.body.kind !== 213) {
+            if (func.body.kind !== 213 /* Block */) {
                 type = checkExpressionCached(func.body, checkMode);
-                if (functionFlags & 2) {
-                    type = checkAwaitedType(type, func, ts.Diagnostics.The_return_type_of_an_async_function_must_either_be_a_valid_promise_or_must_not_contain_a_callable_then_member);
+                if (functionFlags & 2 /* Async */) {
+                    // From within an async function you can return either a non-promise value or a promise. Any
+                    // Promise/A+ compatible implementation will always assimilate any foreign promise, so the
+                    // return type of the body should be unwrapped to its awaited type, which we will wrap in
+                    // the native Promise<T> type later in this function.
+                    type = checkAwaitedType(type, /*errorNode*/ func, ts.Diagnostics.The_return_type_of_an_async_function_must_either_be_a_valid_promise_or_must_not_contain_a_callable_then_member);
                 }
             }
             else {
                 var types = checkAndAggregateReturnExpressionTypes(func, checkMode);
-                if (functionFlags & 1) {
+                if (functionFlags & 1 /* Generator */) { // Generator or AsyncGenerator function
                     types = ts.concatenate(checkAndAggregateYieldOperandTypes(func, checkMode), types);
                     if (!types || types.length === 0) {
-                        var iterableIteratorAny = functionFlags & 2
-                            ? createAsyncIterableIteratorType(anyType)
-                            : createIterableIteratorType(anyType);
+                        var iterableIteratorAny = functionFlags & 2 /* Async */
+                            ? createAsyncIterableIteratorType(anyType) // AsyncGenerator function
+                            : createIterableIteratorType(anyType); // Generator function
                         if (noImplicitAny) {
                             error(func.asteriskToken, ts.Diagnostics.Generator_implicitly_has_type_0_because_it_does_not_yield_any_values_Consider_supplying_a_return_type, typeToString(iterableIteratorAny));
                         }
@@ -36721,17 +46862,20 @@ var ts;
                 }
                 else {
                     if (!types) {
-                        return functionFlags & 2
-                            ? createPromiseReturnType(func, neverType)
-                            : neverType;
+                        // For an async function, the return type will not be never, but rather a Promise for never.
+                        return functionFlags & 2 /* Async */
+                            ? createPromiseReturnType(func, neverType) // Async function
+                            : neverType; // Normal function
                     }
                     if (types.length === 0) {
-                        return functionFlags & 2
-                            ? createPromiseReturnType(func, voidType)
-                            : voidType;
+                        // For an async function, the return type will not be void, but rather a Promise for void.
+                        return functionFlags & 2 /* Async */
+                            ? createPromiseReturnType(func, voidType) // Async function
+                            : voidType; // Normal function
                     }
                 }
-                type = getUnionType(types, 2);
+                // Return a union of the return expression types.
+                type = getUnionType(types, 2 /* Subtype */);
             }
             var contextualSignature = getContextualSignatureForFunctionLikeDeclaration(func);
             if (!contextualSignature) {
@@ -36742,14 +46886,14 @@ var ts;
                     contextualSignature === getSignatureFromDeclaration(func) ? type :
                         getReturnTypeOfSignature(contextualSignature);
                 if (contextualType) {
-                    switch (functionFlags & 3) {
-                        case 3:
-                            contextualType = getIteratedTypeOfGenerator(contextualType, true);
+                    switch (functionFlags & 3 /* AsyncGenerator */) {
+                        case 3 /* AsyncGenerator */:
+                            contextualType = getIteratedTypeOfGenerator(contextualType, /*isAsyncGenerator*/ true);
                             break;
-                        case 1:
-                            contextualType = getIteratedTypeOfGenerator(contextualType, false);
+                        case 1 /* Generator */:
+                            contextualType = getIteratedTypeOfGenerator(contextualType, /*isAsyncGenerator*/ false);
                             break;
-                        case 2:
+                        case 2 /* Async */:
                             contextualType = getPromisedTypeOfPromise(contextualType);
                             break;
                     }
@@ -36757,12 +46901,15 @@ var ts;
                 type = getWidenedLiteralLikeTypeForContextualType(type, contextualType);
             }
             var widenedType = getWidenedType(type);
-            switch (functionFlags & 3) {
-                case 3:
+            switch (functionFlags & 3 /* AsyncGenerator */) {
+                case 3 /* AsyncGenerator */:
                     return createAsyncIterableIteratorType(widenedType);
-                case 1:
+                case 1 /* Generator */:
                     return createIterableIteratorType(widenedType);
-                case 2:
+                case 2 /* Async */:
+                    // From within an async function you can return either a non-promise value or a promise. Any
+                    // Promise/A+ compatible implementation will always assimilate any foreign promise, so the
+                    // return type of the body is awaited type of the body, wrapped in a native Promise<T> type.
                     return createPromiseType(widenedType);
                 default:
                     return widenedType;
@@ -36770,7 +46917,7 @@ var ts;
         }
         function checkAndAggregateYieldOperandTypes(func, checkMode) {
             var aggregatedTypes = [];
-            var isAsync = (ts.getFunctionFlags(func) & 2) !== 0;
+            var isAsync = (ts.getFunctionFlags(func) & 2 /* Async */) !== 0;
             ts.forEachYieldExpression(func.body, function (yieldExpression) {
                 ts.pushIfUnique(aggregatedTypes, getYieldedTypeOfYieldExpression(yieldExpression, isAsync, checkMode));
             });
@@ -36779,7 +46926,8 @@ var ts;
         function getYieldedTypeOfYieldExpression(node, isAsync, checkMode) {
             var errorNode = node.expression || node;
             var expressionType = node.expression ? checkExpressionCached(node.expression, checkMode) : undefinedWideningType;
-            var yieldedType = node.asteriskToken ? checkIteratedTypeOrElementType(expressionType, errorNode, false, isAsync) : expressionType;
+            // A `yield*` expression effectively yields everything that its operand yields
+            var yieldedType = node.asteriskToken ? checkIteratedTypeOrElementType(expressionType, errorNode, /*allowStringInput*/ false, isAsync) : expressionType;
             return !isAsync ? yieldedType : getAwaitedType(yieldedType, errorNode, node.asteriskToken
                 ? ts.Diagnostics.Type_of_iterated_elements_of_a_yield_Asterisk_operand_must_either_be_a_valid_promise_or_must_not_contain_a_callable_then_member
                 : ts.Diagnostics.Type_of_yield_operand_in_an_async_generator_must_either_be_a_valid_promise_or_must_not_contain_a_callable_then_member);
@@ -36799,14 +46947,15 @@ var ts;
             return eachTypeContainedIn(mapType(type, getRegularTypeOfLiteralType), switchTypes);
         }
         function functionHasImplicitReturn(func) {
-            if (!(func.flags & 128)) {
+            if (!(func.flags & 128 /* HasImplicitReturn */)) {
                 return false;
             }
-            if (ts.some(func.body.statements, function (statement) { return statement.kind === 227 && isExhaustiveSwitchStatement(statement); })) {
+            if (ts.some(func.body.statements, function (statement) { return statement.kind === 227 /* SwitchStatement */ && isExhaustiveSwitchStatement(statement); })) {
                 return false;
             }
             return true;
         }
+        /** NOTE: Return value of `[]` means a different thing than `undefined`. `[]` means func returns `void`, `undefined` means it returns `never`. */
         function checkAndAggregateReturnExpressionTypes(func, checkMode) {
             var functionFlags = ts.getFunctionFlags(func);
             var aggregatedTypes = [];
@@ -36816,10 +46965,14 @@ var ts;
                 var expr = returnStatement.expression;
                 if (expr) {
                     var type = checkExpressionCached(expr, checkMode);
-                    if (functionFlags & 2) {
+                    if (functionFlags & 2 /* Async */) {
+                        // From within an async function you can return either a non-promise value or a promise. Any
+                        // Promise/A+ compatible implementation will always assimilate any foreign promise, so the
+                        // return type of the body should be unwrapped to its awaited type, which should be wrapped in
+                        // the native Promise<T> type by the caller.
                         type = checkAwaitedType(type, func, ts.Diagnostics.The_return_type_of_an_async_function_must_either_be_a_valid_promise_or_must_not_contain_a_callable_then_member);
                     }
-                    if (type.flags & 32768) {
+                    if (type.flags & 32768 /* Never */) {
                         hasReturnOfTypeNever = true;
                     }
                     ts.pushIfUnique(aggregatedTypes, type);
@@ -36833,36 +46986,52 @@ var ts;
             }
             if (strictNullChecks && aggregatedTypes.length && hasReturnWithNoExpression &&
                 !(isJavaScriptConstructor(func) && aggregatedTypes.some(function (t) { return t.symbol === func.symbol; }))) {
+                // Javascript "callable constructors", containing eg `if (!(this instanceof A)) return new A()` should not add undefined
                 ts.pushIfUnique(aggregatedTypes, undefinedType);
             }
             return aggregatedTypes;
         }
         function mayReturnNever(func) {
             switch (func.kind) {
-                case 192:
-                case 193:
+                case 192 /* FunctionExpression */:
+                case 193 /* ArrowFunction */:
                     return true;
-                case 154:
-                    return func.parent.kind === 184;
+                case 154 /* MethodDeclaration */:
+                    return func.parent.kind === 184 /* ObjectLiteralExpression */;
                 default:
                     return false;
             }
         }
+        /**
+         * TypeScript Specification 1.0 (6.3) - July 2014
+         *   An explicitly typed function whose return type isn't the Void type,
+         *   the Any type, or a union type containing the Void or Any type as a constituent
+         *   must have at least one return statement somewhere in its body.
+         *   An exception to this rule is if the function implementation consists of a single 'throw' statement.
+         *
+         * @param returnType - return type of the function, can be undefined if return type is not explicitly specified
+         */
         function checkAllCodePathsInNonVoidFunctionReturnOrThrow(func, returnType) {
             if (!produceDiagnostics) {
                 return;
             }
-            if (returnType && maybeTypeOfKind(returnType, 3 | 4096)) {
+            // Functions with with an explicitly specified 'void' or 'any' return type don't need any return expressions.
+            if (returnType && maybeTypeOfKind(returnType, 3 /* AnyOrUnknown */ | 4096 /* Void */)) {
                 return;
             }
-            if (func.kind === 153 || ts.nodeIsMissing(func.body) || func.body.kind !== 213 || !functionHasImplicitReturn(func)) {
+            // If all we have is a function signature, or an arrow function with an expression body, then there is nothing to check.
+            // also if HasImplicitReturn flag is not set this means that all codepaths in function body end with return or throw
+            if (func.kind === 153 /* MethodSignature */ || ts.nodeIsMissing(func.body) || func.body.kind !== 213 /* Block */ || !functionHasImplicitReturn(func)) {
                 return;
             }
-            var hasExplicitReturn = func.flags & 256;
-            if (returnType && returnType.flags & 32768) {
+            var hasExplicitReturn = func.flags & 256 /* HasExplicitReturn */;
+            if (returnType && returnType.flags & 32768 /* Never */) {
                 error(ts.getEffectiveReturnTypeNode(func), ts.Diagnostics.A_function_returning_never_cannot_have_a_reachable_end_point);
             }
             else if (returnType && !hasExplicitReturn) {
+                // minimal check: function has syntactic return type annotation and no explicit return statements in the body
+                // this function does not conform to the specification.
+                // NOTE: having returnType !== undefined is a precondition for entering this branch so func.type will always be present
                 error(ts.getEffectiveReturnTypeNode(func), ts.Diagnostics.A_function_whose_declared_type_is_neither_void_nor_any_must_return_a_value);
             }
             else if (returnType && strictNullChecks && !isTypeAssignableTo(undefinedType, returnType)) {
@@ -36870,6 +47039,9 @@ var ts;
             }
             else if (compilerOptions.noImplicitReturns) {
                 if (!returnType) {
+                    // If return type annotation is omitted check if function has any explicit return statements.
+                    // If it does not have any - its inferred return type is void - don't do any checks.
+                    // Otherwise get inferred return type from function body and report error only if it is not void / anytype
                     if (!hasExplicitReturn) {
                         return;
                     }
@@ -36882,12 +47054,14 @@ var ts;
             }
         }
         function checkFunctionExpressionOrObjectLiteralMethod(node, checkMode) {
-            ts.Debug.assert(node.kind !== 154 || ts.isObjectLiteralMethod(node));
-            if (checkMode === 1 && isContextSensitive(node)) {
+            ts.Debug.assert(node.kind !== 154 /* MethodDeclaration */ || ts.isObjectLiteralMethod(node));
+            // The identityMapper object is used to indicate that function expressions are wildcards
+            if (checkMode === 1 /* SkipContextSensitive */ && isContextSensitive(node)) {
                 return anyFunctionType;
             }
+            // Grammar checking
             var hasGrammarError = checkGrammarFunctionLikeDeclaration(node);
-            if (!hasGrammarError && node.kind === 192) {
+            if (!hasGrammarError && node.kind === 192 /* FunctionExpression */) {
                 checkGrammarForGenerator(node);
             }
             var links = getNodeLinks(node);
@@ -36895,15 +47069,19 @@ var ts;
             if (isTypeAny(type)) {
                 return type;
             }
-            if (!(links.flags & 1024)) {
+            // Check if function expression is contextually typed and assign parameter types if so.
+            if (!(links.flags & 1024 /* ContextChecked */)) {
                 var contextualSignature = getContextualSignature(node);
-                if (!(links.flags & 1024)) {
-                    links.flags |= 1024;
+                // If a type check is started at a function expression that is an argument of a function call, obtaining the
+                // contextual type may recursively get back to here during overload resolution of the call. If so, we will have
+                // already assigned contextual types.
+                if (!(links.flags & 1024 /* ContextChecked */)) {
+                    links.flags |= 1024 /* ContextChecked */;
                     if (contextualSignature) {
-                        var signature = getSignaturesOfType(type, 0)[0];
+                        var signature = getSignaturesOfType(type, 0 /* Call */)[0];
                         if (isContextSensitive(node)) {
                             var contextualMapper = getContextualMapper(node);
-                            if (checkMode === 2) {
+                            if (checkMode === 2 /* Inferential */) {
                                 inferFromAnnotatedParameters(signature, contextualSignature, contextualMapper);
                             }
                             var instantiatedContextualSignature = contextualMapper === identityMapper ?
@@ -36924,31 +47102,42 @@ var ts;
             return type;
         }
         function checkFunctionExpressionOrObjectLiteralMethodDeferred(node) {
-            ts.Debug.assert(node.kind !== 154 || ts.isObjectLiteralMethod(node));
+            ts.Debug.assert(node.kind !== 154 /* MethodDeclaration */ || ts.isObjectLiteralMethod(node));
             var functionFlags = ts.getFunctionFlags(node);
             var returnTypeNode = ts.getEffectiveReturnTypeNode(node);
             var returnOrPromisedType = returnTypeNode &&
-                ((functionFlags & 3) === 2 ?
-                    checkAsyncFunctionReturnType(node) :
-                    getTypeFromTypeNode(returnTypeNode));
-            if ((functionFlags & 1) === 0) {
+                ((functionFlags & 3 /* AsyncGenerator */) === 2 /* Async */ ?
+                    checkAsyncFunctionReturnType(node) : // Async function
+                    getTypeFromTypeNode(returnTypeNode)); // AsyncGenerator function, Generator function, or normal function
+            if ((functionFlags & 1 /* Generator */) === 0) { // Async function or normal function
+                // return is not necessary in the body of generators
                 checkAllCodePathsInNonVoidFunctionReturnOrThrow(node, returnOrPromisedType);
             }
             if (node.body) {
                 if (!returnTypeNode) {
+                    // There are some checks that are only performed in getReturnTypeFromBody, that may produce errors
+                    // we need. An example is the noImplicitAny errors resulting from widening the return expression
+                    // of a function. Because checking of function expression bodies is deferred, there was never an
+                    // appropriate time to do this during the main walk of the file (see the comment at the top of
+                    // checkFunctionExpressionBodies). So it must be done now.
                     getReturnTypeOfSignature(getSignatureFromDeclaration(node));
                 }
-                if (node.body.kind === 213) {
+                if (node.body.kind === 213 /* Block */) {
                     checkSourceElement(node.body);
                 }
                 else {
+                    // From within an async function you can return either a non-promise value or a promise. Any
+                    // Promise/A+ compatible implementation will always assimilate any foreign promise, so we
+                    // should not be checking assignability of a promise to the return type. Instead, we need to
+                    // check assignability of the awaited type of the expression body against the promised type of
+                    // its return type annotation.
                     var exprType = checkExpression(node.body);
                     if (returnOrPromisedType) {
-                        if ((functionFlags & 3) === 2) {
+                        if ((functionFlags & 3 /* AsyncGenerator */) === 2 /* Async */) { // Async function
                             var awaitedType = checkAwaitedType(exprType, node.body, ts.Diagnostics.The_return_type_of_an_async_function_must_either_be_a_valid_promise_or_must_not_contain_a_callable_then_member);
                             checkTypeAssignableTo(awaitedType, returnOrPromisedType, node.body);
                         }
-                        else {
+                        else { // Normal function
                             checkTypeAssignableTo(exprType, returnOrPromisedType, node.body);
                         }
                     }
@@ -36956,28 +47145,39 @@ var ts;
             }
         }
         function checkArithmeticOperandType(operand, type, diagnostic) {
-            if (!isTypeAssignableToKind(type, 168)) {
+            if (!isTypeAssignableToKind(type, 168 /* NumberLike */)) {
                 error(operand, diagnostic);
                 return false;
             }
             return true;
         }
         function isReadonlySymbol(symbol) {
-            return !!(ts.getCheckFlags(symbol) & 8 ||
-                symbol.flags & 4 && ts.getDeclarationModifierFlagsFromSymbol(symbol) & 64 ||
-                symbol.flags & 3 && getDeclarationNodeFlagsFromSymbol(symbol) & 2 ||
-                symbol.flags & 98304 && !(symbol.flags & 65536) ||
-                symbol.flags & 8);
+            // The following symbols are considered read-only:
+            // Properties with a 'readonly' modifier
+            // Variables declared with 'const'
+            // Get accessors without matching set accessors
+            // Enum members
+            // Unions and intersections of the above (unions and intersections eagerly set isReadonly on creation)
+            return !!(ts.getCheckFlags(symbol) & 8 /* Readonly */ ||
+                symbol.flags & 4 /* Property */ && ts.getDeclarationModifierFlagsFromSymbol(symbol) & 64 /* Readonly */ ||
+                symbol.flags & 3 /* Variable */ && getDeclarationNodeFlagsFromSymbol(symbol) & 2 /* Const */ ||
+                symbol.flags & 98304 /* Accessor */ && !(symbol.flags & 65536 /* SetAccessor */) ||
+                symbol.flags & 8 /* EnumMember */);
         }
         function isReferenceToReadonlyEntity(expr, symbol) {
             if (isReadonlySymbol(symbol)) {
-                if (symbol.flags & 4 &&
-                    (expr.kind === 185 || expr.kind === 186) &&
-                    expr.expression.kind === 99) {
+                // Allow assignments to readonly properties within constructors of the same class declaration.
+                if (symbol.flags & 4 /* Property */ &&
+                    (expr.kind === 185 /* PropertyAccessExpression */ || expr.kind === 186 /* ElementAccessExpression */) &&
+                    expr.expression.kind === 99 /* ThisKeyword */) {
+                    // Look for if this is the constructor for the class that `symbol` is a property of.
                     var func = ts.getContainingFunction(expr);
-                    if (!(func && func.kind === 155)) {
+                    if (!(func && func.kind === 155 /* Constructor */)) {
                         return true;
                     }
+                    // If func.parent is a class and symbol is a (readonly) property of that class, or
+                    // if func is a constructor and symbol is a (readonly) parameter property declared in it,
+                    // then symbol is writeable here.
                     return !(func.parent === symbol.valueDeclaration.parent || func === symbol.valueDeclaration.parent);
                 }
                 return true;
@@ -36985,21 +47185,22 @@ var ts;
             return false;
         }
         function isReferenceThroughNamespaceImport(expr) {
-            if (expr.kind === 185 || expr.kind === 186) {
+            if (expr.kind === 185 /* PropertyAccessExpression */ || expr.kind === 186 /* ElementAccessExpression */) {
                 var node = ts.skipParentheses(expr.expression);
-                if (node.kind === 71) {
+                if (node.kind === 71 /* Identifier */) {
                     var symbol = getNodeLinks(node).resolvedSymbol;
-                    if (symbol.flags & 2097152) {
+                    if (symbol.flags & 2097152 /* Alias */) {
                         var declaration = getDeclarationOfAliasSymbol(symbol);
-                        return !!declaration && declaration.kind === 246;
+                        return !!declaration && declaration.kind === 246 /* NamespaceImport */;
                     }
                 }
             }
             return false;
         }
         function checkReferenceExpression(expr, invalidReferenceMessage) {
-            var node = ts.skipOuterExpressions(expr, 2 | 1);
-            if (node.kind !== 71 && node.kind !== 185 && node.kind !== 186) {
+            // References are combinations of identifiers, parentheses, and property accesses.
+            var node = ts.skipOuterExpressions(expr, 2 /* Assertions */ | 1 /* Parentheses */);
+            if (node.kind !== 71 /* Identifier */ && node.kind !== 185 /* PropertyAccessExpression */ && node.kind !== 186 /* ElementAccessExpression */) {
                 error(expr, invalidReferenceMessage);
                 return false;
             }
@@ -37008,7 +47209,7 @@ var ts;
         function checkDeleteExpression(node) {
             checkExpression(node.expression);
             var expr = ts.skipParentheses(node.expression);
-            if (expr.kind !== 185 && expr.kind !== 186) {
+            if (expr.kind !== 185 /* PropertyAccessExpression */ && expr.kind !== 186 /* ElementAccessExpression */) {
                 error(expr, ts.Diagnostics.The_operand_of_a_delete_operator_must_be_a_property_reference);
                 return booleanType;
             }
@@ -37028,8 +47229,9 @@ var ts;
             return undefinedWideningType;
         }
         function checkAwaitExpression(node) {
+            // Grammar checking
             if (produceDiagnostics) {
-                if (!(node.flags & 16384)) {
+                if (!(node.flags & 16384 /* AwaitContext */)) {
                     grammarErrorOnFirstToken(node, ts.Diagnostics.await_expression_is_only_allowed_within_an_async_function);
                 }
                 if (isInParameterInitializerBeforeContainingFunction(node)) {
@@ -37044,32 +47246,33 @@ var ts;
             if (operandType === silentNeverType) {
                 return silentNeverType;
             }
-            if (node.operand.kind === 8) {
-                if (node.operator === 38) {
+            if (node.operand.kind === 8 /* NumericLiteral */) {
+                if (node.operator === 38 /* MinusToken */) {
                     return getFreshTypeOfLiteralType(getLiteralType(-node.operand.text));
                 }
-                else if (node.operator === 37) {
+                else if (node.operator === 37 /* PlusToken */) {
                     return getFreshTypeOfLiteralType(getLiteralType(+node.operand.text));
                 }
             }
             switch (node.operator) {
-                case 37:
-                case 38:
-                case 52:
+                case 37 /* PlusToken */:
+                case 38 /* MinusToken */:
+                case 52 /* TildeToken */:
                     checkNonNullType(operandType, node.operand);
-                    if (maybeTypeOfKind(operandType, 3072)) {
+                    if (maybeTypeOfKind(operandType, 3072 /* ESSymbolLike */)) {
                         error(node.operand, ts.Diagnostics.The_0_operator_cannot_be_applied_to_type_symbol, ts.tokenToString(node.operator));
                     }
                     return numberType;
-                case 51:
-                    var facts = getTypeFacts(operandType) & (1048576 | 2097152);
-                    return facts === 1048576 ? falseType :
-                        facts === 2097152 ? trueType :
+                case 51 /* ExclamationToken */:
+                    var facts = getTypeFacts(operandType) & (1048576 /* Truthy */ | 2097152 /* Falsy */);
+                    return facts === 1048576 /* Truthy */ ? falseType :
+                        facts === 2097152 /* Falsy */ ? trueType :
                             booleanType;
-                case 43:
-                case 44:
+                case 43 /* PlusPlusToken */:
+                case 44 /* MinusMinusToken */:
                     var ok = checkArithmeticOperandType(node.operand, checkNonNullType(operandType, node.operand), ts.Diagnostics.An_arithmetic_operand_must_be_of_type_any_number_or_an_enum_type);
                     if (ok) {
+                        // run check only if former checks succeeded to avoid reporting cascading errors
                         checkReferenceExpression(node.operand, ts.Diagnostics.The_operand_of_an_increment_or_decrement_operator_must_be_a_variable_or_a_property_access);
                     }
                     return numberType;
@@ -37083,15 +47286,18 @@ var ts;
             }
             var ok = checkArithmeticOperandType(node.operand, checkNonNullType(operandType, node.operand), ts.Diagnostics.An_arithmetic_operand_must_be_of_type_any_number_or_an_enum_type);
             if (ok) {
+                // run check only if former checks succeeded to avoid reporting cascading errors
                 checkReferenceExpression(node.operand, ts.Diagnostics.The_operand_of_an_increment_or_decrement_operator_must_be_a_variable_or_a_property_access);
             }
             return numberType;
         }
+        // Return true if type might be of the given kind. A union or intersection type might be of a given
+        // kind if at least one constituent type is of the given kind.
         function maybeTypeOfKind(type, kind) {
-            if (type.flags & kind & ~134217728 || kind & 134217728 && isGenericMappedType(type)) {
+            if (type.flags & kind & ~134217728 /* GenericMappedType */ || kind & 134217728 /* GenericMappedType */ && isGenericMappedType(type)) {
                 return true;
             }
-            if (type.flags & 786432) {
+            if (type.flags & 786432 /* UnionOrIntersection */) {
                 var types = type.types;
                 for (var _i = 0, types_16 = types; _i < types_16.length; _i++) {
                     var t = types_16[_i];
@@ -37106,38 +47312,44 @@ var ts;
             if (source.flags & kind) {
                 return true;
             }
-            if (strict && source.flags & (3 | 4096 | 8192 | 16384)) {
+            if (strict && source.flags & (3 /* AnyOrUnknown */ | 4096 /* Void */ | 8192 /* Undefined */ | 16384 /* Null */)) {
                 return false;
             }
-            return !!(kind & 168) && isTypeAssignableTo(source, numberType) ||
-                !!(kind & 68) && isTypeAssignableTo(source, stringType) ||
-                !!(kind & 272) && isTypeAssignableTo(source, booleanType) ||
-                !!(kind & 4096) && isTypeAssignableTo(source, voidType) ||
-                !!(kind & 32768) && isTypeAssignableTo(source, neverType) ||
-                !!(kind & 16384) && isTypeAssignableTo(source, nullType) ||
-                !!(kind & 8192) && isTypeAssignableTo(source, undefinedType) ||
-                !!(kind & 1024) && isTypeAssignableTo(source, esSymbolType) ||
-                !!(kind & 16777216) && isTypeAssignableTo(source, nonPrimitiveType);
+            return !!(kind & 168 /* NumberLike */) && isTypeAssignableTo(source, numberType) ||
+                !!(kind & 68 /* StringLike */) && isTypeAssignableTo(source, stringType) ||
+                !!(kind & 272 /* BooleanLike */) && isTypeAssignableTo(source, booleanType) ||
+                !!(kind & 4096 /* Void */) && isTypeAssignableTo(source, voidType) ||
+                !!(kind & 32768 /* Never */) && isTypeAssignableTo(source, neverType) ||
+                !!(kind & 16384 /* Null */) && isTypeAssignableTo(source, nullType) ||
+                !!(kind & 8192 /* Undefined */) && isTypeAssignableTo(source, undefinedType) ||
+                !!(kind & 1024 /* ESSymbol */) && isTypeAssignableTo(source, esSymbolType) ||
+                !!(kind & 16777216 /* NonPrimitive */) && isTypeAssignableTo(source, nonPrimitiveType);
         }
         function allTypesAssignableToKind(source, kind, strict) {
-            return source.flags & 262144 ?
+            return source.flags & 262144 /* Union */ ?
                 ts.every(source.types, function (subType) { return allTypesAssignableToKind(subType, kind, strict); }) :
                 isTypeAssignableToKind(source, kind, strict);
         }
         function isConstEnumObjectType(type) {
-            return !!(ts.getObjectFlags(type) & 16) && !!type.symbol && isConstEnumSymbol(type.symbol);
+            return !!(ts.getObjectFlags(type) & 16 /* Anonymous */) && !!type.symbol && isConstEnumSymbol(type.symbol);
         }
         function isConstEnumSymbol(symbol) {
-            return (symbol.flags & 128) !== 0;
+            return (symbol.flags & 128 /* ConstEnum */) !== 0;
         }
         function checkInstanceOfExpression(left, right, leftType, rightType) {
             if (leftType === silentNeverType || rightType === silentNeverType) {
                 return silentNeverType;
             }
+            // TypeScript 1.0 spec (April 2014): 4.15.4
+            // The instanceof operator requires the left operand to be of type Any, an object type, or a type parameter type,
+            // and the right operand to be of type Any, a subtype of the 'Function' interface type, or have a call or construct signature.
+            // The result is always of the Boolean primitive type.
+            // NOTE: do not raise error if leftType is unknown as related error was already reported
             if (!isTypeAny(leftType) &&
-                allTypesAssignableToKind(leftType, 32764)) {
+                allTypesAssignableToKind(leftType, 32764 /* Primitive */)) {
                 error(left, ts.Diagnostics.The_left_hand_side_of_an_instanceof_expression_must_be_of_type_any_an_object_type_or_a_type_parameter);
             }
+            // NOTE: do not raise error if right is unknown as related error was already reported
             if (!(isTypeAny(rightType) || typeHasCallOrConstructSignatures(rightType) || isTypeSubtypeOf(rightType, globalFunctionType))) {
                 error(right, ts.Diagnostics.The_right_hand_side_of_an_instanceof_expression_must_be_of_type_any_or_of_a_type_assignable_to_the_Function_interface_type);
             }
@@ -37149,17 +47361,20 @@ var ts;
             }
             leftType = checkNonNullType(leftType, left);
             rightType = checkNonNullType(rightType, right);
-            if (!(isTypeComparableTo(leftType, stringType) || isTypeAssignableToKind(leftType, 168 | 3072))) {
+            // TypeScript 1.0 spec (April 2014): 4.15.5
+            // The in operator requires the left operand to be of type Any, the String primitive type, or the Number primitive type,
+            // and the right operand to be of type Any, an object type, or a type parameter type.
+            // The result is always of the Boolean primitive type.
+            if (!(isTypeComparableTo(leftType, stringType) || isTypeAssignableToKind(leftType, 168 /* NumberLike */ | 3072 /* ESSymbolLike */))) {
                 error(left, ts.Diagnostics.The_left_hand_side_of_an_in_expression_must_be_of_type_any_string_number_or_symbol);
             }
-            if (!isTypeAssignableToKind(rightType, 16777216 | 14745600)) {
+            if (!isTypeAssignableToKind(rightType, 16777216 /* NonPrimitive */ | 14745600 /* InstantiableNonPrimitive */)) {
                 error(right, ts.Diagnostics.The_right_hand_side_of_an_in_expression_must_be_of_type_any_an_object_type_or_a_type_parameter);
             }
             return booleanType;
         }
         function checkObjectLiteralAssignment(node, sourceType) {
             var properties = node.properties;
-            checkGrammarForDisallowedTrailingComma(properties, ts.Diagnostics.A_rest_parameter_or_binding_pattern_may_not_have_a_trailing_comma);
             if (strictNullChecks && properties.length === 0) {
                 return checkNonNullType(sourceType, node);
             }
@@ -37169,10 +47384,11 @@ var ts;
             }
             return sourceType;
         }
+        /** Note: If property cannot be a SpreadAssignment, then allProperties does not need to be provided */
         function checkObjectLiteralDestructuringPropertyAssignment(objectLiteralType, property, allProperties) {
-            if (property.kind === 270 || property.kind === 271) {
+            if (property.kind === 270 /* PropertyAssignment */ || property.kind === 271 /* ShorthandPropertyAssignment */) {
                 var name = property.name;
-                if (name.kind === 147) {
+                if (name.kind === 147 /* ComputedPropertyName */) {
                     checkComputedPropertyName(name);
                 }
                 if (isComputedNonLiteralName(name)) {
@@ -37182,13 +47398,14 @@ var ts;
                 var type = isTypeAny(objectLiteralType)
                     ? objectLiteralType
                     : getTypeOfPropertyOfType(objectLiteralType, text) ||
-                        isNumericLiteralName(text) && getIndexTypeOfType(objectLiteralType, 1) ||
-                        getIndexTypeOfType(objectLiteralType, 0);
+                        isNumericLiteralName(text) && getIndexTypeOfType(objectLiteralType, 1 /* Number */) ||
+                        getIndexTypeOfType(objectLiteralType, 0 /* String */);
                 if (type) {
-                    if (property.kind === 271) {
+                    if (property.kind === 271 /* ShorthandPropertyAssignment */) {
                         return checkDestructuringAssignment(property, type);
                     }
                     else {
+                        // non-shorthand property assignments should always have initializers
                         return checkDestructuringAssignment(property.initializer, type);
                     }
                 }
@@ -37196,9 +47413,9 @@ var ts;
                     error(name, ts.Diagnostics.Type_0_has_no_property_1_and_no_string_index_signature, typeToString(objectLiteralType), ts.declarationNameToString(name));
                 }
             }
-            else if (property.kind === 272) {
-                if (languageVersion < 6) {
-                    checkExternalEmitHelpers(property, 4);
+            else if (property.kind === 272 /* SpreadAssignment */) {
+                if (languageVersion < 6 /* ESNext */) {
+                    checkExternalEmitHelpers(property, 4 /* Rest */);
                 }
                 var nonRestNames = [];
                 if (allProperties) {
@@ -37207,6 +47424,7 @@ var ts;
                     }
                 }
                 var type = getRestType(objectLiteralType, nonRestNames, objectLiteralType.symbol);
+                checkGrammarForDisallowedTrailingComma(allProperties, ts.Diagnostics.A_rest_parameter_or_binding_pattern_may_not_have_a_trailing_comma);
                 return checkDestructuringAssignment(property.expression, type);
             }
             else {
@@ -37215,11 +47433,13 @@ var ts;
         }
         function checkArrayLiteralAssignment(node, sourceType, checkMode) {
             var elements = node.elements;
-            checkGrammarForDisallowedTrailingComma(elements, ts.Diagnostics.A_rest_parameter_or_binding_pattern_may_not_have_a_trailing_comma);
-            if (languageVersion < 2 && compilerOptions.downlevelIteration) {
-                checkExternalEmitHelpers(node, 512);
+            if (languageVersion < 2 /* ES2015 */ && compilerOptions.downlevelIteration) {
+                checkExternalEmitHelpers(node, 512 /* Read */);
             }
-            var elementType = checkIteratedTypeOrElementType(sourceType, node, false, false) || errorType;
+            // This elementType will be used if the specific property corresponding to this index is not
+            // present (aka the tuple element property). This call also checks that the parentType is in
+            // fact an iterable or array (depending on target language).
+            var elementType = checkIteratedTypeOrElementType(sourceType, node, /*allowStringInput*/ false, /*allowAsyncIterables*/ false) || errorType;
             for (var i = 0; i < elements.length; i++) {
                 checkArrayLiteralDestructuringElementAssignment(node, sourceType, i, elementType, checkMode);
             }
@@ -37228,8 +47448,8 @@ var ts;
         function checkArrayLiteralDestructuringElementAssignment(node, sourceType, elementIndex, elementType, checkMode) {
             var elements = node.elements;
             var element = elements[elementIndex];
-            if (element.kind !== 206) {
-                if (element.kind !== 204) {
+            if (element.kind !== 206 /* OmittedExpression */) {
+                if (element.kind !== 204 /* SpreadElement */) {
                     var propName = "" + elementIndex;
                     var type = isTypeAny(sourceType)
                         ? sourceType
@@ -37240,6 +47460,8 @@ var ts;
                         return checkDestructuringAssignment(element, type, checkMode);
                     }
                     else {
+                        // We still need to check element expression here because we may need to set appropriate flag on the expression
+                        // such as NodeCheckFlags.LexicalThis on "this"expression.
                         checkExpression(element);
                         if (isTupleType(sourceType)) {
                             error(element, ts.Diagnostics.Tuple_type_0_with_length_1_cannot_be_assigned_to_tuple_with_length_2, typeToString(sourceType), getTypeReferenceArity(sourceType), elements.length);
@@ -37255,10 +47477,11 @@ var ts;
                     }
                     else {
                         var restExpression = element.expression;
-                        if (restExpression.kind === 200 && restExpression.operatorToken.kind === 58) {
+                        if (restExpression.kind === 200 /* BinaryExpression */ && restExpression.operatorToken.kind === 58 /* EqualsToken */) {
                             error(restExpression.operatorToken, ts.Diagnostics.A_rest_element_cannot_have_an_initializer);
                         }
                         else {
+                            checkGrammarForDisallowedTrailingComma(node.elements, ts.Diagnostics.A_rest_parameter_or_binding_pattern_may_not_have_a_trailing_comma);
                             return checkDestructuringAssignment(restExpression, createArrayType(elementType), checkMode);
                         }
                     }
@@ -37268,12 +47491,14 @@ var ts;
         }
         function checkDestructuringAssignment(exprOrAssignment, sourceType, checkMode) {
             var target;
-            if (exprOrAssignment.kind === 271) {
+            if (exprOrAssignment.kind === 271 /* ShorthandPropertyAssignment */) {
                 var prop = exprOrAssignment;
                 if (prop.objectAssignmentInitializer) {
+                    // In strict null checking mode, if a default value of a non-undefined type is specified, remove
+                    // undefined from the final type.
                     if (strictNullChecks &&
-                        !(getFalsyFlags(checkExpression(prop.objectAssignmentInitializer)) & 8192)) {
-                        sourceType = getTypeWithFacts(sourceType, 131072);
+                        !(getFalsyFlags(checkExpression(prop.objectAssignmentInitializer)) & 8192 /* Undefined */)) {
+                        sourceType = getTypeWithFacts(sourceType, 131072 /* NEUndefined */);
                     }
                     checkBinaryLikeExpression(prop.name, prop.equalsToken, prop.objectAssignmentInitializer, checkMode);
                 }
@@ -37282,80 +47507,91 @@ var ts;
             else {
                 target = exprOrAssignment;
             }
-            if (target.kind === 200 && target.operatorToken.kind === 58) {
+            if (target.kind === 200 /* BinaryExpression */ && target.operatorToken.kind === 58 /* EqualsToken */) {
                 checkBinaryExpression(target, checkMode);
                 target = target.left;
             }
-            if (target.kind === 184) {
+            if (target.kind === 184 /* ObjectLiteralExpression */) {
                 return checkObjectLiteralAssignment(target, sourceType);
             }
-            if (target.kind === 183) {
+            if (target.kind === 183 /* ArrayLiteralExpression */) {
                 return checkArrayLiteralAssignment(target, sourceType, checkMode);
             }
             return checkReferenceAssignment(target, sourceType, checkMode);
         }
         function checkReferenceAssignment(target, sourceType, checkMode) {
             var targetType = checkExpression(target, checkMode);
-            var error = target.parent.kind === 272 ?
+            var error = target.parent.kind === 272 /* SpreadAssignment */ ?
                 ts.Diagnostics.The_target_of_an_object_rest_assignment_must_be_a_variable_or_a_property_access :
                 ts.Diagnostics.The_left_hand_side_of_an_assignment_expression_must_be_a_variable_or_a_property_access;
             if (checkReferenceExpression(target, error)) {
-                checkTypeAssignableTo(sourceType, targetType, target, undefined);
+                checkTypeAssignableTo(sourceType, targetType, target, /*headMessage*/ undefined);
             }
             return sourceType;
         }
+        /**
+         * This is a *shallow* check: An expression is side-effect-free if the
+         * evaluation of the expression *itself* cannot produce side effects.
+         * For example, x++ / 3 is side-effect free because the / operator
+         * does not have side effects.
+         * The intent is to "smell test" an expression for correctness in positions where
+         * its value is discarded (e.g. the left side of the comma operator).
+         */
         function isSideEffectFree(node) {
             node = ts.skipParentheses(node);
             switch (node.kind) {
-                case 71:
-                case 9:
-                case 12:
-                case 189:
-                case 202:
-                case 13:
-                case 8:
-                case 101:
-                case 86:
-                case 95:
-                case 140:
-                case 192:
-                case 205:
-                case 193:
-                case 183:
-                case 184:
-                case 195:
-                case 209:
-                case 256:
-                case 255:
+                case 71 /* Identifier */:
+                case 9 /* StringLiteral */:
+                case 12 /* RegularExpressionLiteral */:
+                case 189 /* TaggedTemplateExpression */:
+                case 202 /* TemplateExpression */:
+                case 13 /* NoSubstitutionTemplateLiteral */:
+                case 8 /* NumericLiteral */:
+                case 101 /* TrueKeyword */:
+                case 86 /* FalseKeyword */:
+                case 95 /* NullKeyword */:
+                case 140 /* UndefinedKeyword */:
+                case 192 /* FunctionExpression */:
+                case 205 /* ClassExpression */:
+                case 193 /* ArrowFunction */:
+                case 183 /* ArrayLiteralExpression */:
+                case 184 /* ObjectLiteralExpression */:
+                case 195 /* TypeOfExpression */:
+                case 209 /* NonNullExpression */:
+                case 256 /* JsxSelfClosingElement */:
+                case 255 /* JsxElement */:
                     return true;
-                case 201:
+                case 201 /* ConditionalExpression */:
                     return isSideEffectFree(node.whenTrue) &&
                         isSideEffectFree(node.whenFalse);
-                case 200:
+                case 200 /* BinaryExpression */:
                     if (ts.isAssignmentOperator(node.operatorToken.kind)) {
                         return false;
                     }
                     return isSideEffectFree(node.left) &&
                         isSideEffectFree(node.right);
-                case 198:
-                case 199:
+                case 198 /* PrefixUnaryExpression */:
+                case 199 /* PostfixUnaryExpression */:
+                    // Unary operators ~, !, +, and - have no side effects.
+                    // The rest do.
                     switch (node.operator) {
-                        case 51:
-                        case 37:
-                        case 38:
-                        case 52:
+                        case 51 /* ExclamationToken */:
+                        case 37 /* PlusToken */:
+                        case 38 /* MinusToken */:
+                        case 52 /* TildeToken */:
                             return true;
                     }
                     return false;
-                case 196:
-                case 190:
-                case 208:
+                // Some forms listed here for clarity
+                case 196 /* VoidExpression */: // Explicit opt-out
+                case 190 /* TypeAssertionExpression */: // Not SEF, but can produce useful type warnings
+                case 208 /* AsExpression */: // Not SEF, but can produce useful type warnings
                 default:
                     return false;
             }
         }
         function isTypeEqualityComparableTo(source, target) {
-            return (target.flags & 24576) !== 0 || isTypeComparableTo(source, target);
+            return (target.flags & 24576 /* Nullable */) !== 0 || isTypeComparableTo(source, target);
         }
         function checkBinaryExpression(node, checkMode) {
             if (ts.isInJavaScriptFile(node) && ts.getAssignedJavascriptInitializer(node)) {
@@ -37365,46 +47601,49 @@ var ts;
         }
         function checkBinaryLikeExpression(left, operatorToken, right, checkMode, errorNode) {
             var operator = operatorToken.kind;
-            if (operator === 58 && (left.kind === 184 || left.kind === 183)) {
+            if (operator === 58 /* EqualsToken */ && (left.kind === 184 /* ObjectLiteralExpression */ || left.kind === 183 /* ArrayLiteralExpression */)) {
                 return checkDestructuringAssignment(left, checkExpression(right, checkMode), checkMode);
             }
             var leftType = checkExpression(left, checkMode);
             var rightType = checkExpression(right, checkMode);
             switch (operator) {
-                case 39:
-                case 40:
-                case 61:
-                case 62:
-                case 41:
-                case 63:
-                case 42:
-                case 64:
-                case 38:
-                case 60:
-                case 45:
-                case 65:
-                case 46:
-                case 66:
-                case 47:
-                case 67:
-                case 49:
-                case 69:
-                case 50:
-                case 70:
-                case 48:
-                case 68:
+                case 39 /* AsteriskToken */:
+                case 40 /* AsteriskAsteriskToken */:
+                case 61 /* AsteriskEqualsToken */:
+                case 62 /* AsteriskAsteriskEqualsToken */:
+                case 41 /* SlashToken */:
+                case 63 /* SlashEqualsToken */:
+                case 42 /* PercentToken */:
+                case 64 /* PercentEqualsToken */:
+                case 38 /* MinusToken */:
+                case 60 /* MinusEqualsToken */:
+                case 45 /* LessThanLessThanToken */:
+                case 65 /* LessThanLessThanEqualsToken */:
+                case 46 /* GreaterThanGreaterThanToken */:
+                case 66 /* GreaterThanGreaterThanEqualsToken */:
+                case 47 /* GreaterThanGreaterThanGreaterThanToken */:
+                case 67 /* GreaterThanGreaterThanGreaterThanEqualsToken */:
+                case 49 /* BarToken */:
+                case 69 /* BarEqualsToken */:
+                case 50 /* CaretToken */:
+                case 70 /* CaretEqualsToken */:
+                case 48 /* AmpersandToken */:
+                case 68 /* AmpersandEqualsToken */:
                     if (leftType === silentNeverType || rightType === silentNeverType) {
                         return silentNeverType;
                     }
                     leftType = checkNonNullType(leftType, left);
                     rightType = checkNonNullType(rightType, right);
                     var suggestedOperator = void 0;
-                    if ((leftType.flags & 272) &&
-                        (rightType.flags & 272) &&
+                    // if a user tries to apply a bitwise operator to 2 boolean operands
+                    // try and return them a helpful suggestion
+                    if ((leftType.flags & 272 /* BooleanLike */) &&
+                        (rightType.flags & 272 /* BooleanLike */) &&
                         (suggestedOperator = getSuggestedBooleanOperator(operatorToken.kind)) !== undefined) {
                         error(errorNode || operatorToken, ts.Diagnostics.The_0_operator_is_not_allowed_for_boolean_types_Consider_using_1_instead, ts.tokenToString(operatorToken.kind), ts.tokenToString(suggestedOperator));
                     }
                     else {
+                        // otherwise just check each operand separately and report errors as normal
                         var leftOk = checkArithmeticOperandType(left, leftType, ts.Diagnostics.The_left_hand_side_of_an_arithmetic_operation_must_be_of_type_any_number_or_an_enum_type);
                         var rightOk = checkArithmeticOperandType(right, rightType, ts.Diagnostics.The_right_hand_side_of_an_arithmetic_operation_must_be_of_type_any_number_or_an_enum_type);
                         if (leftOk && rightOk) {
@@ -37412,25 +47651,31 @@ var ts;
                         }
                     }
                     return numberType;
-                case 37:
-                case 59:
+                case 37 /* PlusToken */:
+                case 59 /* PlusEqualsToken */:
                     if (leftType === silentNeverType || rightType === silentNeverType) {
                         return silentNeverType;
                     }
-                    if (!isTypeAssignableToKind(leftType, 68) && !isTypeAssignableToKind(rightType, 68)) {
+                    if (!isTypeAssignableToKind(leftType, 68 /* StringLike */) && !isTypeAssignableToKind(rightType, 68 /* StringLike */)) {
                         leftType = checkNonNullType(leftType, left);
                         rightType = checkNonNullType(rightType, right);
                     }
                     var resultType = void 0;
-                    if (isTypeAssignableToKind(leftType, 168, true) && isTypeAssignableToKind(rightType, 168, true)) {
+                    if (isTypeAssignableToKind(leftType, 168 /* NumberLike */, /*strict*/ true) && isTypeAssignableToKind(rightType, 168 /* NumberLike */, /*strict*/ true)) {
+                        // Operands of an enum type are treated as having the primitive type Number.
+                        // If both operands are of the Number primitive type, the result is of the Number primitive type.
                         resultType = numberType;
                     }
-                    else if (isTypeAssignableToKind(leftType, 68, true) || isTypeAssignableToKind(rightType, 68, true)) {
+                    else if (isTypeAssignableToKind(leftType, 68 /* StringLike */, /*strict*/ true) || isTypeAssignableToKind(rightType, 68 /* StringLike */, /*strict*/ true)) {
+                        // If one or both operands are of the String primitive type, the result is of the String primitive type.
                         resultType = stringType;
                     }
                     else if (isTypeAny(leftType) || isTypeAny(rightType)) {
+                        // Otherwise, the result is of type Any.
+                        // NOTE: unknown type here denotes error type. Old compiler treated this case as any type so do we.
                         resultType = leftType === errorType || rightType === errorType ? errorType : anyType;
                     }
+                    // Symbols are not allowed at all in arithmetic expressions
                     if (resultType && !checkForDisallowedESSymbolOperand(operator)) {
                         return resultType;
                     }
@@ -37438,14 +47683,14 @@ var ts;
                         reportOperatorError();
                         return anyType;
                     }
-                    if (operator === 59) {
+                    if (operator === 59 /* PlusEqualsToken */) {
                         checkAssignmentOperator(resultType);
                     }
                     return resultType;
-                case 27:
-                case 29:
-                case 30:
-                case 31:
+                case 27 /* LessThanToken */:
+                case 29 /* GreaterThanToken */:
+                case 30 /* LessThanEqualsToken */:
+                case 31 /* GreaterThanEqualsToken */:
                     if (checkForDisallowedESSymbolOperand(operator)) {
                         leftType = getBaseTypeOfLiteralType(checkNonNullType(leftType, left));
                         rightType = getBaseTypeOfLiteralType(checkNonNullType(rightType, right));
@@ -37454,10 +47699,10 @@ var ts;
                         }
                     }
                     return booleanType;
-                case 32:
-                case 33:
-                case 34:
-                case 35:
+                case 32 /* EqualsEqualsToken */:
+                case 33 /* ExclamationEqualsToken */:
+                case 34 /* EqualsEqualsEqualsToken */:
+                case 35 /* ExclamationEqualsEqualsToken */:
                     var leftIsLiteral = isLiteralType(leftType);
                     var rightIsLiteral = isLiteralType(rightType);
                     if (!leftIsLiteral || !rightIsLiteral) {
@@ -37468,23 +47713,23 @@ var ts;
                         reportOperatorError();
                     }
                     return booleanType;
-                case 93:
+                case 93 /* InstanceOfKeyword */:
                     return checkInstanceOfExpression(left, right, leftType, rightType);
-                case 92:
+                case 92 /* InKeyword */:
                     return checkInExpression(left, right, leftType, rightType);
-                case 53:
-                    return getTypeFacts(leftType) & 1048576 ?
+                case 53 /* AmpersandAmpersandToken */:
+                    return getTypeFacts(leftType) & 1048576 /* Truthy */ ?
                         getUnionType([extractDefinitelyFalsyTypes(strictNullChecks ? leftType : getBaseTypeOfLiteralType(rightType)), rightType]) :
                         leftType;
-                case 54:
-                    return getTypeFacts(leftType) & 2097152 ?
-                        getUnionType([removeDefinitelyFalsyTypes(leftType), rightType], 2) :
+                case 54 /* BarBarToken */:
+                    return getTypeFacts(leftType) & 2097152 /* Falsy */ ?
+                        getUnionType([removeDefinitelyFalsyTypes(leftType), rightType], 2 /* Subtype */) :
                         leftType;
-                case 58:
+                case 58 /* EqualsToken */:
                     checkSpecialAssignment(left, right);
                     checkAssignmentOperator(rightType);
                     return getRegularTypeOfObjectLiteral(rightType);
-                case 26:
+                case 26 /* CommaToken */:
                     if (!compilerOptions.allowUnreachableCode && isSideEffectFree(left) && !isEvalNode(right)) {
                         error(left, ts.Diagnostics.Left_side_of_comma_operator_is_unused_and_has_no_side_effects);
                     }
@@ -37494,15 +47739,15 @@ var ts;
             }
             function checkSpecialAssignment(left, right) {
                 var special = ts.getSpecialPropertyAssignmentKind(left.parent);
-                if (special === 2) {
+                if (special === 2 /* ModuleExports */) {
                     var rightType_1 = checkExpression(right, checkMode);
                     for (var _i = 0, _a = getPropertiesOfObjectType(rightType_1); _i < _a.length; _i++) {
                         var prop = _a[_i];
                         var propType = getTypeOfSymbol(prop);
-                        if (propType.symbol && propType.symbol.flags & 32) {
+                        if (propType.symbol && propType.symbol.flags & 32 /* Class */) {
                             var name = prop.escapedName;
-                            var symbol = resolveName(prop.valueDeclaration, name, 67901928, undefined, name, false);
-                            if (symbol && symbol.declarations.some(function (d) { return d.kind === 297; })) {
+                            var symbol = resolveName(prop.valueDeclaration, name, 67901928 /* Type */, undefined, name, /*isUse*/ false);
+                            if (symbol && symbol.declarations.some(ts.isJSDocTypedefTag)) {
                                 grammarErrorOnNode(symbol.declarations[0], ts.Diagnostics.Duplicate_identifier_0, ts.unescapeLeadingUnderscores(name));
                                 return grammarErrorOnNode(prop.valueDeclaration, ts.Diagnostics.Duplicate_identifier_0, ts.unescapeLeadingUnderscores(name));
                             }
@@ -37511,11 +47756,12 @@ var ts;
                 }
             }
             function isEvalNode(node) {
-                return node.kind === 71 && node.escapedText === "eval";
+                return node.kind === 71 /* Identifier */ && node.escapedText === "eval";
             }
+            // Return true if there was no error, false if there was an error.
             function checkForDisallowedESSymbolOperand(operator) {
-                var offendingSymbolOperand = maybeTypeOfKind(leftType, 3072) ? left :
-                    maybeTypeOfKind(rightType, 3072) ? right :
+                var offendingSymbolOperand = maybeTypeOfKind(leftType, 3072 /* ESSymbolLike */) ? left :
+                    maybeTypeOfKind(rightType, 3072 /* ESSymbolLike */) ? right :
                         undefined;
                 if (offendingSymbolOperand) {
                     error(offendingSymbolOperand, ts.Diagnostics.The_0_operator_cannot_be_applied_to_type_symbol, ts.tokenToString(operator));
@@ -37525,24 +47771,31 @@ var ts;
             }
             function getSuggestedBooleanOperator(operator) {
                 switch (operator) {
-                    case 49:
-                    case 69:
-                        return 54;
-                    case 50:
-                    case 70:
-                        return 35;
-                    case 48:
-                    case 68:
-                        return 53;
+                    case 49 /* BarToken */:
+                    case 69 /* BarEqualsToken */:
+                        return 54 /* BarBarToken */;
+                    case 50 /* CaretToken */:
+                    case 70 /* CaretEqualsToken */:
+                        return 35 /* ExclamationEqualsEqualsToken */;
+                    case 48 /* AmpersandToken */:
+                    case 68 /* AmpersandEqualsToken */:
+                        return 53 /* AmpersandAmpersandToken */;
                     default:
                         return undefined;
                 }
             }
             function checkAssignmentOperator(valueType) {
                 if (produceDiagnostics && ts.isAssignmentOperator(operator)) {
+                    // TypeScript 1.0 spec (April 2014): 4.17
+                    // An assignment of the form
+                    //    VarExpr = ValueExpr
+                    // requires VarExpr to be classified as a reference
+                    // A compound assignment furthermore requires VarExpr to be classified as a reference (section 4.1)
+                    // and the type of the non-compound operation to be assignable to the type of VarExpr.
                     if (checkReferenceExpression(left, ts.Diagnostics.The_left_hand_side_of_an_assignment_expression_must_be_a_variable_or_a_property_access)
                         && (!ts.isIdentifier(left) || ts.unescapeLeadingUnderscores(left.escapedText) !== "exports")) {
-                        checkTypeAssignableTo(valueType, leftType, left, undefined);
+                        // to avoid cascading errors check assignability only if 'isReference' check succeeded and no errors were reported
+                        checkTypeAssignableTo(valueType, leftType, left, /*headMessage*/ undefined);
                     }
                 }
             }
@@ -37566,8 +47819,9 @@ var ts;
             return false;
         }
         function checkYieldExpression(node) {
+            // Grammar checking
             if (produceDiagnostics) {
-                if (!(node.flags & 4096) || isYieldExpressionInClass(node)) {
+                if (!(node.flags & 4096 /* YieldContext */) || isYieldExpressionInClass(node)) {
                     grammarErrorOnFirstToken(node, ts.Diagnostics.A_yield_expression_is_only_allowed_in_a_generator_body);
                 }
                 if (isInParameterInitializerBeforeContainingFunction(node)) {
@@ -37578,45 +47832,58 @@ var ts;
             if (!func)
                 return anyType;
             var functionFlags = ts.getFunctionFlags(func);
-            if (!(functionFlags & 1)) {
+            if (!(functionFlags & 1 /* Generator */)) {
+                // If the user's code is syntactically correct, the func should always have a star. After all, we are in a yield context.
                 return anyType;
             }
             if (node.asteriskToken) {
-                if ((functionFlags & 3) === 3 &&
-                    languageVersion < 6) {
-                    checkExternalEmitHelpers(node, 26624);
+                // Async generator functions prior to ESNext require the __await, __asyncDelegator,
+                // and __asyncValues helpers
+                if ((functionFlags & 3 /* AsyncGenerator */) === 3 /* AsyncGenerator */ &&
+                    languageVersion < 6 /* ESNext */) {
+                    checkExternalEmitHelpers(node, 26624 /* AsyncDelegatorIncludes */);
                 }
-                if ((functionFlags & 3) === 1 &&
-                    languageVersion < 2 && compilerOptions.downlevelIteration) {
-                    checkExternalEmitHelpers(node, 256);
+                // Generator functions prior to ES2015 require the __values helper
+                if ((functionFlags & 3 /* AsyncGenerator */) === 1 /* Generator */ &&
+                    languageVersion < 2 /* ES2015 */ && compilerOptions.downlevelIteration) {
+                    checkExternalEmitHelpers(node, 256 /* Values */);
                 }
             }
-            var isAsync = (functionFlags & 2) !== 0;
-            var yieldedType = getYieldedTypeOfYieldExpression(node, isAsync);
+            var isAsync = (functionFlags & 2 /* Async */) !== 0;
+            var yieldedType = getYieldedTypeOfYieldExpression(node, isAsync); // TODO: GH#18217
+            // There is no point in doing an assignability check if the function
+            // has no explicit return type because the return type is directly computed
+            // from the yield expressions.
             var returnType = ts.getEffectiveReturnTypeNode(func);
             if (returnType) {
                 var signatureElementType = getIteratedTypeOfGenerator(getTypeFromTypeNode(returnType), isAsync) || anyType;
-                checkTypeAssignableTo(yieldedType, signatureElementType, node.expression || node, undefined);
+                checkTypeAssignableTo(yieldedType, signatureElementType, node.expression || node, /*headMessage*/ undefined);
             }
+            // Both yield and yield* expressions have type 'any'
             return anyType;
         }
         function checkConditionalExpression(node, checkMode) {
             checkExpression(node.condition);
             var type1 = checkExpression(node.whenTrue, checkMode);
             var type2 = checkExpression(node.whenFalse, checkMode);
-            return getUnionType([type1, type2], 2);
+            return getUnionType([type1, type2], 2 /* Subtype */);
         }
         function checkTemplateExpression(node) {
+            // We just want to check each expressions, but we are unconcerned with
+            // the type of each expression, as any value may be coerced into a string.
+            // It is worth asking whether this is what we really want though.
+            // A place where we actually *are* concerned with the expressions' types are
+            // in tagged templates.
             ts.forEach(node.templateSpans, function (templateSpan) {
-                if (maybeTypeOfKind(checkExpression(templateSpan.expression), 3072)) {
+                if (maybeTypeOfKind(checkExpression(templateSpan.expression), 3072 /* ESSymbolLike */)) {
                     error(templateSpan.expression, ts.Diagnostics.Type_0_cannot_be_converted_to_type_1, typeToString(esSymbolType), typeToString(stringType));
                 }
             });
             return stringType;
         }
         function getContextNode(node) {
-            if (node.kind === 263) {
-                return node.parent.parent;
+            if (node.kind === 263 /* JsxAttributes */) {
+                return node.parent.parent; // Needs to be the root JsxElement, so it encompasses the attributes _and_ the children (which are essentially part of the attributes)
             }
             return node;
         }
@@ -37626,8 +47893,8 @@ var ts;
             var saveContextualMapper = context.contextualMapper;
             context.contextualType = contextualType;
             context.contextualMapper = contextualMapper;
-            var checkMode = contextualMapper === identityMapper ? 1 :
-                contextualMapper ? 2 : 3;
+            var checkMode = contextualMapper === identityMapper ? 1 /* SkipContextSensitive */ :
+                contextualMapper ? 2 /* Inferential */ : 3 /* Contextual */;
             var result = checkExpression(node, checkMode);
             context.contextualType = saveContextualType;
             context.contextualMapper = saveContextualMapper;
@@ -37639,6 +47906,9 @@ var ts;
                 if (checkMode) {
                     return checkExpression(node, checkMode);
                 }
+                // When computing a type that we're going to cache, we need to ignore any ongoing control flow
+                // analysis because variables may have transient types in indeterminable states. Moving flowLoopStart
+                // to the top of the stack ensures all transient types are computed from a known point.
                 var saveFlowLoopStart = flowLoopStart;
                 flowLoopStart = flowLoopCount;
                 links.resolvedType = checkExpression(node, checkMode);
@@ -37648,16 +47918,16 @@ var ts;
         }
         function isTypeAssertion(node) {
             node = ts.skipParentheses(node);
-            return node.kind === 190 || node.kind === 208;
+            return node.kind === 190 /* TypeAssertionExpression */ || node.kind === 208 /* AsExpression */;
         }
         function checkDeclarationInitializer(declaration) {
             var initializer = ts.getEffectiveInitializer(declaration);
-            var type = getTypeOfExpression(initializer, true);
-            var widened = ts.getCombinedNodeFlags(declaration) & 2 ||
-                (ts.getCombinedModifierFlags(declaration) & 64 && !ts.isParameterPropertyDeclaration(declaration)) ||
+            var type = getTypeOfExpression(initializer, /*cache*/ true);
+            var widened = ts.getCombinedNodeFlags(declaration) & 2 /* Const */ ||
+                (ts.getCombinedModifierFlags(declaration) & 64 /* Readonly */ && !ts.isParameterPropertyDeclaration(declaration)) ||
                 isTypeAssertion(initializer) ? type : getWidenedLiteralType(type);
             if (ts.isInJavaScriptFile(declaration)) {
-                if (widened.flags & 24576) {
+                if (widened.flags & 24576 /* Nullable */) {
                     if (noImplicitAny) {
                         reportImplicitAnyError(declaration, anyType);
                     }
@@ -37674,21 +47944,26 @@ var ts;
         }
         function isLiteralOfContextualType(candidateType, contextualType) {
             if (contextualType) {
-                if (contextualType.flags & 786432) {
+                if (contextualType.flags & 786432 /* UnionOrIntersection */) {
                     var types = contextualType.types;
                     return ts.some(types, function (t) { return isLiteralOfContextualType(candidateType, t); });
                 }
-                if (contextualType.flags & 14745600) {
+                if (contextualType.flags & 14745600 /* InstantiableNonPrimitive */) {
+                    // If the contextual type is a type variable constrained to a primitive type, consider
+                    // this a literal context for literals of that primitive type. For example, given a
+                    // type parameter 'T extends string', infer string literal types for T.
                     var constraint = getBaseConstraintOfType(contextualType) || emptyObjectType;
-                    return maybeTypeOfKind(constraint, 4) && maybeTypeOfKind(candidateType, 64) ||
-                        maybeTypeOfKind(constraint, 8) && maybeTypeOfKind(candidateType, 128) ||
-                        maybeTypeOfKind(constraint, 1024) && maybeTypeOfKind(candidateType, 2048) ||
+                    return maybeTypeOfKind(constraint, 4 /* String */) && maybeTypeOfKind(candidateType, 64 /* StringLiteral */) ||
+                        maybeTypeOfKind(constraint, 8 /* Number */) && maybeTypeOfKind(candidateType, 128 /* NumberLiteral */) ||
+                        maybeTypeOfKind(constraint, 1024 /* ESSymbol */) && maybeTypeOfKind(candidateType, 2048 /* UniqueESSymbol */) ||
                         isLiteralOfContextualType(candidateType, constraint);
                 }
-                return !!(contextualType.flags & (64 | 1048576) && maybeTypeOfKind(candidateType, 64) ||
-                    contextualType.flags & 128 && maybeTypeOfKind(candidateType, 128) ||
-                    contextualType.flags & 256 && maybeTypeOfKind(candidateType, 256) ||
-                    contextualType.flags & 2048 && maybeTypeOfKind(candidateType, 2048));
+                // If the contextual type is a literal of a particular primitive type, we consider this a
+                // literal context for all literals of that primitive type.
+                return !!(contextualType.flags & (64 /* StringLiteral */ | 1048576 /* Index */) && maybeTypeOfKind(candidateType, 64 /* StringLiteral */) ||
+                    contextualType.flags & 128 /* NumberLiteral */ && maybeTypeOfKind(candidateType, 128 /* NumberLiteral */) ||
+                    contextualType.flags & 256 /* BooleanLiteral */ && maybeTypeOfKind(candidateType, 256 /* BooleanLiteral */) ||
+                    contextualType.flags & 2048 /* UniqueESSymbol */ && maybeTypeOfKind(candidateType, 2048 /* UniqueESSymbol */));
             }
             return false;
         }
@@ -37701,21 +47976,28 @@ var ts;
                 getWidenedLiteralLikeTypeForContextualType(type, contextualType);
         }
         function checkPropertyAssignment(node, checkMode) {
-            if (node.name.kind === 147) {
+            // Do not use hasDynamicName here, because that returns false for well known symbols.
+            // We want to perform checkComputedPropertyName for all computed properties, including
+            // well known symbols.
+            if (node.name.kind === 147 /* ComputedPropertyName */) {
                 checkComputedPropertyName(node.name);
             }
             return checkExpressionForMutableLocation(node.initializer, checkMode);
         }
         function checkObjectLiteralMethod(node, checkMode) {
+            // Grammar checking
             checkGrammarMethod(node);
-            if (node.name.kind === 147) {
+            // Do not use hasDynamicName here, because that returns false for well known symbols.
+            // We want to perform checkComputedPropertyName for all computed properties, including
+            // well known symbols.
+            if (node.name.kind === 147 /* ComputedPropertyName */) {
                 checkComputedPropertyName(node.name);
             }
             var uninstantiatedType = checkFunctionExpressionOrObjectLiteralMethod(node, checkMode);
             return instantiateTypeWithSingleGenericCallSignature(node, uninstantiatedType, checkMode);
         }
         function instantiateTypeWithSingleGenericCallSignature(node, type, checkMode) {
-            if (checkMode === 2) {
+            if (checkMode === 2 /* Inferential */) {
                 var signature = getSingleCallSignature(type);
                 if (signature && signature.typeParameters) {
                     var contextualType = getApparentTypeOfContextualType(node);
@@ -37729,16 +48011,34 @@ var ts;
             }
             return type;
         }
+        /**
+         * Returns the type of an expression. Unlike checkExpression, this function is simply concerned
+         * with computing the type and may not fully check all contained sub-expressions for errors.
+         * A cache argument of true indicates that if the function performs a full type check, it is ok
+         * to cache the result.
+         */
         function getTypeOfExpression(node, cache) {
-            if (node.kind === 187 && node.expression.kind !== 97 && !ts.isRequireCall(node, true) && !isSymbolOrSymbolForCall(node)) {
+            // Optimize for the common case of a call to a function with a single non-generic call
+            // signature where we can just fetch the return type without checking the arguments.
+            if (node.kind === 187 /* CallExpression */ && node.expression.kind !== 97 /* SuperKeyword */ && !ts.isRequireCall(node, /*checkArgumentIsStringLiteralLike*/ true) && !isSymbolOrSymbolForCall(node)) {
                 var funcType = checkNonNullExpression(node.expression);
                 var signature = getSingleCallSignature(funcType);
                 if (signature && !signature.typeParameters) {
                     return getReturnTypeOfSignature(signature);
                 }
             }
+            // Otherwise simply call checkExpression. Ideally, the entire family of checkXXX functions
+            // should have a parameter that indicates whether full error checking is required such that
+            // we can perform the optimizations locally.
             return cache ? checkExpressionCached(node) : checkExpression(node);
         }
+        /**
+         * Returns the type of an expression. Unlike checkExpression, this function is simply concerned
+         * with computing the type and may not fully check all contained sub-expressions for errors.
+         * It is intended for uses where you know there is no contextual type,
+         * and requesting the contextual type might cause a circularity or other bad behaviour.
+         * It sets the contextual type of the node to any before calling getTypeOfExpression.
+         */
         function getContextFreeTypeOfExpression(node) {
             var saveContextualType = node.contextualType;
             node.contextualType = anyType;
@@ -37746,9 +48046,19 @@ var ts;
             node.contextualType = saveContextualType;
             return type;
         }
+        function checkExpresionNoReturn(node) {
+            checkExpression(node);
+        }
+        // Checks an expression and returns its type. The contextualMapper parameter serves two purposes: When
+        // contextualMapper is not undefined and not equal to the identityMapper function object it indicates that the
+        // expression is being inferentially typed (section 4.15.2 in spec) and provides the type mapper to use in
+        // conjunction with the generic contextual type. When contextualMapper is equal to the identityMapper function
+        // object, it serves as an indicator that all contained function and arrow expressions should be considered to
+        // have the wildcard function type; this form of type check is used during overload resolution to exclude
+        // contextually typed function and arrow expressions in the initial phase.
         function checkExpression(node, checkMode) {
             var type;
-            if (node.kind === 146) {
+            if (node.kind === 146 /* QualifiedName */) {
                 type = checkQualifiedName(node);
             }
             else {
@@ -37756,10 +48066,14 @@ var ts;
                 type = instantiateTypeWithSingleGenericCallSignature(node, uninstantiatedType, checkMode);
             }
             if (isConstEnumObjectType(type)) {
-                var ok = (node.parent.kind === 185 && node.parent.expression === node) ||
-                    (node.parent.kind === 186 && node.parent.expression === node) ||
-                    ((node.kind === 71 || node.kind === 146) && isInRightSideOfImportOrExportAssignment(node) ||
-                        (node.parent.kind === 165 && node.parent.exprName === node));
+                // enum object type for const enums are only permitted in:
+                // - 'left' in property access
+                // - 'object' in indexed access
+                // - target in rhs of import statement
+                var ok = (node.parent.kind === 185 /* PropertyAccessExpression */ && node.parent.expression === node) ||
+                    (node.parent.kind === 186 /* ElementAccessExpression */ && node.parent.expression === node) ||
+                    ((node.kind === 71 /* Identifier */ || node.kind === 146 /* QualifiedName */) && isInRightSideOfImportOrExportAssignment(node) ||
+                        (node.parent.kind === 165 /* TypeQuery */ && node.parent.exprName === node));
                 if (!ok) {
                     error(node, ts.Diagnostics.const_enums_can_only_be_used_in_property_or_index_access_expressions_or_the_right_hand_side_of_an_import_declaration_or_export_assignment_or_type_query);
                 }
@@ -37775,96 +48089,99 @@ var ts;
         }
         function checkExpressionWorker(node, checkMode) {
             switch (node.kind) {
-                case 71:
+                case 71 /* Identifier */:
                     return checkIdentifier(node);
-                case 99:
+                case 99 /* ThisKeyword */:
                     return checkThisExpression(node);
-                case 97:
+                case 97 /* SuperKeyword */:
                     return checkSuperExpression(node);
-                case 95:
+                case 95 /* NullKeyword */:
                     return nullWideningType;
-                case 13:
-                case 9:
+                case 13 /* NoSubstitutionTemplateLiteral */:
+                case 9 /* StringLiteral */:
                     return getFreshTypeOfLiteralType(getLiteralType(node.text));
-                case 8:
+                case 8 /* NumericLiteral */:
                     checkGrammarNumericLiteral(node);
                     return getFreshTypeOfLiteralType(getLiteralType(+node.text));
-                case 101:
+                case 101 /* TrueKeyword */:
                     return trueType;
-                case 86:
+                case 86 /* FalseKeyword */:
                     return falseType;
-                case 202:
+                case 202 /* TemplateExpression */:
                     return checkTemplateExpression(node);
-                case 12:
+                case 12 /* RegularExpressionLiteral */:
                     return globalRegExpType;
-                case 183:
+                case 183 /* ArrayLiteralExpression */:
                     return checkArrayLiteral(node, checkMode);
-                case 184:
+                case 184 /* ObjectLiteralExpression */:
                     return checkObjectLiteral(node, checkMode);
-                case 185:
+                case 185 /* PropertyAccessExpression */:
                     return checkPropertyAccessExpression(node);
-                case 186:
+                case 186 /* ElementAccessExpression */:
                     return checkIndexedAccess(node);
-                case 187:
-                    if (node.expression.kind === 91) {
+                case 187 /* CallExpression */:
+                    if (node.expression.kind === 91 /* ImportKeyword */) {
                         return checkImportCallExpression(node);
                     }
-                case 188:
+                /* falls through */
+                case 188 /* NewExpression */:
                     return checkCallExpression(node);
-                case 189:
+                case 189 /* TaggedTemplateExpression */:
                     return checkTaggedTemplateExpression(node);
-                case 191:
+                case 191 /* ParenthesizedExpression */:
                     return checkParenthesizedExpression(node, checkMode);
-                case 205:
+                case 205 /* ClassExpression */:
                     return checkClassExpression(node);
-                case 192:
-                case 193:
+                case 192 /* FunctionExpression */:
+                case 193 /* ArrowFunction */:
                     return checkFunctionExpressionOrObjectLiteralMethod(node, checkMode);
-                case 195:
+                case 195 /* TypeOfExpression */:
                     return checkTypeOfExpression(node);
-                case 190:
-                case 208:
+                case 190 /* TypeAssertionExpression */:
+                case 208 /* AsExpression */:
                     return checkAssertion(node);
-                case 209:
+                case 209 /* NonNullExpression */:
                     return checkNonNullAssertion(node);
-                case 210:
+                case 210 /* MetaProperty */:
                     return checkMetaProperty(node);
-                case 194:
+                case 194 /* DeleteExpression */:
                     return checkDeleteExpression(node);
-                case 196:
+                case 196 /* VoidExpression */:
                     return checkVoidExpression(node);
-                case 197:
+                case 197 /* AwaitExpression */:
                     return checkAwaitExpression(node);
-                case 198:
+                case 198 /* PrefixUnaryExpression */:
                     return checkPrefixUnaryExpression(node);
-                case 199:
+                case 199 /* PostfixUnaryExpression */:
                     return checkPostfixUnaryExpression(node);
-                case 200:
+                case 200 /* BinaryExpression */:
                     return checkBinaryExpression(node, checkMode);
-                case 201:
+                case 201 /* ConditionalExpression */:
                     return checkConditionalExpression(node, checkMode);
-                case 204:
+                case 204 /* SpreadElement */:
                     return checkSpreadExpression(node, checkMode);
-                case 206:
+                case 206 /* OmittedExpression */:
                     return undefinedWideningType;
-                case 203:
+                case 203 /* YieldExpression */:
                     return checkYieldExpression(node);
-                case 265:
+                case 265 /* JsxExpression */:
                     return checkJsxExpression(node, checkMode);
-                case 255:
+                case 255 /* JsxElement */:
                     return checkJsxElement(node, checkMode);
-                case 256:
+                case 256 /* JsxSelfClosingElement */:
                     return checkJsxSelfClosingElement(node, checkMode);
-                case 259:
+                case 259 /* JsxFragment */:
                     return checkJsxFragment(node, checkMode);
-                case 263:
+                case 263 /* JsxAttributes */:
                     return checkJsxAttributes(node, checkMode);
-                case 257:
+                case 257 /* JsxOpeningElement */:
                     ts.Debug.fail("Shouldn't ever directly check a JsxOpeningElement");
             }
             return errorType;
         }
+        // DECLARATION AND STATEMENT TYPE CHECKING
         function checkTypeParameter(node) {
+            // Grammar Checking
             if (node.expression) {
                 grammarErrorOnFirstToken(node.expression, ts.Diagnostics.Type_expected);
             }
@@ -37887,11 +48204,15 @@ var ts;
             }
         }
         function checkParameter(node) {
+            // Grammar checking
+            // It is a SyntaxError if the Identifier "eval" or the Identifier "arguments" occurs as the
+            // Identifier in a PropertySetParameterList of a PropertyAssignment that is contained in strict code
+            // or if its FunctionBody is strict code(11.1.5).
             checkGrammarDecoratorsAndModifiers(node);
             checkVariableLikeDeclaration(node);
             var func = ts.getContainingFunction(node);
-            if (ts.hasModifier(node, 92)) {
-                if (!(func.kind === 155 && ts.nodeIsPresent(func.body))) {
+            if (ts.hasModifier(node, 92 /* ParameterPropertyModifier */)) {
+                if (!(func.kind === 155 /* Constructor */ && ts.nodeIsPresent(func.body))) {
                     error(node, ts.Diagnostics.A_parameter_property_is_only_allowed_in_a_constructor_implementation);
                 }
             }
@@ -37902,10 +48223,12 @@ var ts;
                 if (func.parameters.indexOf(node) !== 0) {
                     error(node, ts.Diagnostics.A_0_parameter_must_be_the_first_parameter, node.name.escapedText);
                 }
-                if (func.kind === 155 || func.kind === 159 || func.kind === 164) {
+                if (func.kind === 155 /* Constructor */ || func.kind === 159 /* ConstructSignature */ || func.kind === 164 /* ConstructorType */) {
                     error(node, ts.Diagnostics.A_constructor_cannot_have_a_this_parameter);
                 }
             }
+            // Only check rest parameter type if it's not a binding pattern. Since binding patterns are
+            // not allowed in a rest parameter, we already have an error from checkGrammarParameterList.
             if (node.dotDotDotToken && !ts.isBindingPattern(node.name) && !isArrayType(getTypeOfSymbol(node.symbol))) {
                 error(node, ts.Diagnostics.A_rest_parameter_must_be_of_an_array_type);
             }
@@ -37914,7 +48237,7 @@ var ts;
             if (parameterList) {
                 for (var i = 0; i < parameterList.length; i++) {
                     var param = parameterList[i];
-                    if (param.name.kind === 71 && param.name.escapedText === parameter.escapedText) {
+                    if (param.name.kind === 71 /* Identifier */ && param.name.escapedText === parameter.escapedText) {
                         return i;
                     }
                 }
@@ -37924,6 +48247,7 @@ var ts;
         function checkTypePredicate(node) {
             var parent = getTypePredicateParent(node);
             if (!parent) {
+                // The parent must not be valid.
                 error(node, ts.Diagnostics.A_type_predicate_is_only_allowed_in_return_type_position_for_functions_and_methods);
                 return;
             }
@@ -37942,8 +48266,10 @@ var ts;
                         error(parameterName, ts.Diagnostics.A_type_predicate_cannot_reference_a_rest_parameter);
                     }
                     else {
-                        var leadingError = function () { return ts.chainDiagnosticMessages(undefined, ts.Diagnostics.A_type_predicate_s_type_must_be_assignable_to_its_parameter_s_type); };
-                        checkTypeAssignableTo(typePredicate.type, getTypeOfNode(parent.parameters[typePredicate.parameterIndex]), node.type, undefined, leadingError);
+                        var leadingError = function () { return ts.chainDiagnosticMessages(/*details*/ undefined, ts.Diagnostics.A_type_predicate_s_type_must_be_assignable_to_its_parameter_s_type); };
+                        checkTypeAssignableTo(typePredicate.type, getTypeOfNode(parent.parameters[typePredicate.parameterIndex]), // TODO: GH#18217
+                        node.type, 
+                        /*headMessage*/ undefined, leadingError);
                     }
                 }
                 else if (parameterName) {
@@ -37964,13 +48290,13 @@ var ts;
         }
         function getTypePredicateParent(node) {
             switch (node.parent.kind) {
-                case 193:
-                case 158:
-                case 234:
-                case 192:
-                case 163:
-                case 154:
-                case 153:
+                case 193 /* ArrowFunction */:
+                case 158 /* CallSignature */:
+                case 234 /* FunctionDeclaration */:
+                case 192 /* FunctionExpression */:
+                case 163 /* FunctionType */:
+                case 154 /* MethodDeclaration */:
+                case 153 /* MethodSignature */:
                     var parent = node.parent;
                     if (node === parent.type) {
                         return parent;
@@ -37984,11 +48310,11 @@ var ts;
                     continue;
                 }
                 var name = element.name;
-                if (name.kind === 71 && name.escapedText === predicateVariableName) {
+                if (name.kind === 71 /* Identifier */ && name.escapedText === predicateVariableName) {
                     error(predicateVariableNode, ts.Diagnostics.A_type_predicate_cannot_reference_element_0_in_a_binding_pattern, predicateVariableName);
                     return true;
                 }
-                else if (name.kind === 181 || name.kind === 180) {
+                else if (name.kind === 181 /* ArrayBindingPattern */ || name.kind === 180 /* ObjectBindingPattern */) {
                     if (checkIfTypePredicateVariableIsDeclaredInBindingPattern(name, predicateVariableNode, predicateVariableName)) {
                         return true;
                     }
@@ -37996,28 +48322,35 @@ var ts;
             }
         }
         function checkSignatureDeclaration(node) {
-            if (node.kind === 160) {
+            // Grammar checking
+            if (node.kind === 160 /* IndexSignature */) {
                 checkGrammarIndexSignature(node);
             }
-            else if (node.kind === 163 || node.kind === 234 || node.kind === 164 ||
-                node.kind === 158 || node.kind === 155 ||
-                node.kind === 159) {
+            // TODO (yuisu): Remove this check in else-if when SyntaxKind.Construct is moved and ambient context is handled
+            else if (node.kind === 163 /* FunctionType */ || node.kind === 234 /* FunctionDeclaration */ || node.kind === 164 /* ConstructorType */ ||
+                node.kind === 158 /* CallSignature */ || node.kind === 155 /* Constructor */ ||
+                node.kind === 159 /* ConstructSignature */) {
                 checkGrammarFunctionLikeDeclaration(node);
             }
             var functionFlags = ts.getFunctionFlags(node);
-            if (!(functionFlags & 4)) {
-                if ((functionFlags & 3) === 3 && languageVersion < 6) {
-                    checkExternalEmitHelpers(node, 6144);
+            if (!(functionFlags & 4 /* Invalid */)) {
+                // Async generators prior to ESNext require the __await and __asyncGenerator helpers
+                if ((functionFlags & 3 /* AsyncGenerator */) === 3 /* AsyncGenerator */ && languageVersion < 6 /* ESNext */) {
+                    checkExternalEmitHelpers(node, 6144 /* AsyncGeneratorIncludes */);
                 }
-                if ((functionFlags & 3) === 2 && languageVersion < 4) {
-                    checkExternalEmitHelpers(node, 64);
+                // Async functions prior to ES2017 require the __awaiter helper
+                if ((functionFlags & 3 /* AsyncGenerator */) === 2 /* Async */ && languageVersion < 4 /* ES2017 */) {
+                    checkExternalEmitHelpers(node, 64 /* Awaiter */);
                 }
-                if ((functionFlags & 3) !== 0 && languageVersion < 2) {
-                    checkExternalEmitHelpers(node, 128);
+                // Generator functions, Async functions, and Async Generator functions prior to
+                // ES2015 require the __generator helper
+                if ((functionFlags & 3 /* AsyncGenerator */) !== 0 /* Normal */ && languageVersion < 2 /* ES2015 */) {
+                    checkExternalEmitHelpers(node, 128 /* Generator */);
                 }
             }
             checkTypeParameters(node.typeParameters);
             ts.forEach(node.parameters, checkParameter);
+            // TODO(rbuckton): Should we start checking JSDoc types?
             if (node.type) {
                 checkSourceElement(node.type);
             }
@@ -38026,69 +48359,82 @@ var ts;
                 var returnTypeNode = ts.getEffectiveReturnTypeNode(node);
                 if (noImplicitAny && !returnTypeNode) {
                     switch (node.kind) {
-                        case 159:
+                        case 159 /* ConstructSignature */:
                             error(node, ts.Diagnostics.Construct_signature_which_lacks_return_type_annotation_implicitly_has_an_any_return_type);
                             break;
-                        case 158:
+                        case 158 /* CallSignature */:
                             error(node, ts.Diagnostics.Call_signature_which_lacks_return_type_annotation_implicitly_has_an_any_return_type);
                             break;
                     }
                 }
                 if (returnTypeNode) {
                     var functionFlags_1 = ts.getFunctionFlags(node);
-                    if ((functionFlags_1 & (4 | 1)) === 1) {
+                    if ((functionFlags_1 & (4 /* Invalid */ | 1 /* Generator */)) === 1 /* Generator */) {
                         var returnType = getTypeFromTypeNode(returnTypeNode);
                         if (returnType === voidType) {
                             error(returnTypeNode, ts.Diagnostics.A_generator_cannot_have_a_void_type_annotation);
                         }
                         else {
-                            var generatorElementType = getIteratedTypeOfGenerator(returnType, (functionFlags_1 & 2) !== 0) || anyType;
-                            var iterableIteratorInstantiation = functionFlags_1 & 2
-                                ? createAsyncIterableIteratorType(generatorElementType)
-                                : createIterableIteratorType(generatorElementType);
+                            var generatorElementType = getIteratedTypeOfGenerator(returnType, (functionFlags_1 & 2 /* Async */) !== 0) || anyType;
+                            var iterableIteratorInstantiation = functionFlags_1 & 2 /* Async */
+                                ? createAsyncIterableIteratorType(generatorElementType) // AsyncGenerator function
+                                : createIterableIteratorType(generatorElementType); // Generator function
+                            // Naively, one could check that IterableIterator<any> is assignable to the return type annotation.
+                            // However, that would not catch the error in the following case.
+                            //
+                            //    interface BadGenerator extends Iterable<number>, Iterator<string> { }
+                            //    function* g(): BadGenerator { } // Iterable and Iterator have different types!
+                            //
                             checkTypeAssignableTo(iterableIteratorInstantiation, returnType, returnTypeNode);
                         }
                     }
-                    else if ((functionFlags_1 & 3) === 2) {
+                    else if ((functionFlags_1 & 3 /* AsyncGenerator */) === 2 /* Async */) {
                         checkAsyncFunctionReturnType(node);
                     }
                 }
-                if (node.kind !== 160 && node.kind !== 284) {
+                if (node.kind !== 160 /* IndexSignature */ && node.kind !== 284 /* JSDocFunctionType */) {
                     registerForUnusedIdentifiersCheck(node);
                 }
             }
         }
         function checkClassForDuplicateDeclarations(node) {
+            var Declaration;
+            (function (Declaration) {
+                Declaration[Declaration["Getter"] = 1] = "Getter";
+                Declaration[Declaration["Setter"] = 2] = "Setter";
+                Declaration[Declaration["Method"] = 4] = "Method";
+                Declaration[Declaration["Property"] = 3] = "Property";
+            })(Declaration || (Declaration = {}));
             var instanceNames = ts.createUnderscoreEscapedMap();
             var staticNames = ts.createUnderscoreEscapedMap();
             for (var _i = 0, _a = node.members; _i < _a.length; _i++) {
                 var member = _a[_i];
-                if (member.kind === 155) {
+                if (member.kind === 155 /* Constructor */) {
                     for (var _b = 0, _c = member.parameters; _b < _c.length; _b++) {
                         var param = _c[_b];
                         if (ts.isParameterPropertyDeclaration(param) && !ts.isBindingPattern(param.name)) {
-                            addName(instanceNames, param.name, param.name.escapedText, 3);
+                            addName(instanceNames, param.name, param.name.escapedText, 3 /* Property */);
                         }
                     }
                 }
                 else {
-                    var isStatic = ts.hasModifier(member, 32);
+                    var isStatic = ts.hasModifier(member, 32 /* Static */);
                     var names = isStatic ? staticNames : instanceNames;
                     var name = member.name;
                     var memberName = name && ts.getPropertyNameForPropertyNameNode(name);
                     if (name && memberName) {
                         switch (member.kind) {
-                            case 156:
-                                addName(names, name, memberName, 1);
+                            case 156 /* GetAccessor */:
+                                addName(names, name, memberName, 1 /* Getter */);
                                 break;
-                            case 157:
-                                addName(names, name, memberName, 2);
+                            case 157 /* SetAccessor */:
+                                addName(names, name, memberName, 2 /* Setter */);
                                 break;
-                            case 152:
-                                addName(names, name, memberName, 3);
+                            case 152 /* PropertyDeclaration */:
+                                addName(names, name, memberName, 3 /* Property */);
                                 break;
-                            case 154:
-                                addName(names, name, memberName, 4);
+                            case 154 /* MethodDeclaration */:
+                                addName(names, name, memberName, 4 /* Method */);
                                 break;
                         }
                     }
@@ -38097,8 +48443,8 @@ var ts;
             function addName(names, location, name, meaning) {
                 var prev = names.get(name);
                 if (prev) {
-                    if (prev & 4) {
-                        if (meaning !== 4) {
+                    if (prev & 4 /* Method */) {
+                        if (meaning !== 4 /* Method */) {
                             error(location, ts.Diagnostics.Duplicate_identifier_0, ts.getTextOfNode(location));
                         }
                     }
@@ -38114,11 +48460,22 @@ var ts;
                 }
             }
         }
+        /**
+         * Static members being set on a constructor function may conflict with built-in properties
+         * of Function. Esp. in ECMAScript 5 there are non-configurable and non-writable
+         * built-in properties. This check issues a transpile error when a class has a static
+         * member with the same name as a non-writable built-in property.
+         *
+         * @see http://www.ecma-international.org/ecma-262/5.1/#sec-15.3.3
+         * @see http://www.ecma-international.org/ecma-262/5.1/#sec-15.3.5
+         * @see http://www.ecma-international.org/ecma-262/6.0/#sec-properties-of-the-function-constructor
+         * @see http://www.ecma-international.org/ecma-262/6.0/#sec-function-instances
+         */
         function checkClassForStaticPropertyNameConflicts(node) {
             for (var _i = 0, _a = node.members; _i < _a.length; _i++) {
                 var member = _a[_i];
                 var memberNameNode = member.name;
-                var isStatic = ts.hasModifier(member, 32);
+                var isStatic = ts.hasModifier(member, 32 /* Static */);
                 if (isStatic && memberNameNode) {
                     var memberName = ts.getPropertyNameForPropertyNameNode(memberNameNode);
                     switch (memberName) {
@@ -38139,15 +48496,15 @@ var ts;
             var names = ts.createMap();
             for (var _i = 0, _a = node.members; _i < _a.length; _i++) {
                 var member = _a[_i];
-                if (member.kind === 151) {
+                if (member.kind === 151 /* PropertySignature */) {
                     var memberName = void 0;
                     var name = member.name;
                     switch (name.kind) {
-                        case 9:
-                        case 8:
+                        case 9 /* StringLiteral */:
+                        case 8 /* NumericLiteral */:
                             memberName = name.text;
                             break;
-                        case 71:
+                        case 71 /* Identifier */:
                             memberName = ts.idText(name);
                             break;
                         default:
@@ -38164,12 +48521,17 @@ var ts;
             }
         }
         function checkTypeForDuplicateIndexSignatures(node) {
-            if (node.kind === 236) {
+            if (node.kind === 236 /* InterfaceDeclaration */) {
                 var nodeSymbol = getSymbolOfNode(node);
+                // in case of merging interface declaration it is possible that we'll enter this check procedure several times for every declaration
+                // to prevent this run check only for the first declaration of a given kind
                 if (nodeSymbol.declarations.length > 0 && nodeSymbol.declarations[0] !== node) {
                     return;
                 }
             }
+            // TypeScript 1.0 spec (April 2014)
+            // 3.7.4: An object type can contain at most one string index signature and one numeric index signature.
+            // 8.5: A class declaration can have at most one string index member declaration and one numeric index member declaration
             var indexSymbol = getIndexSymbol(getSymbolOfNode(node));
             if (indexSymbol) {
                 var seenNumericIndexer = false;
@@ -38179,7 +48541,7 @@ var ts;
                     var declaration = decl;
                     if (declaration.parameters.length === 1 && declaration.parameters[0].type) {
                         switch (declaration.parameters[0].type.kind) {
-                            case 137:
+                            case 137 /* StringKeyword */:
                                 if (!seenStringIndexer) {
                                     seenStringIndexer = true;
                                 }
@@ -38187,7 +48549,7 @@ var ts;
                                     error(declaration, ts.Diagnostics.Duplicate_string_index_signature);
                                 }
                                 break;
-                            case 134:
+                            case 134 /* NumberKeyword */:
                                 if (!seenNumericIndexer) {
                                     seenNumericIndexer = true;
                                 }
@@ -38201,28 +48563,37 @@ var ts;
             }
         }
         function checkPropertyDeclaration(node) {
+            // Grammar checking
             if (!checkGrammarDecoratorsAndModifiers(node) && !checkGrammarProperty(node))
                 checkGrammarComputedPropertyName(node.name);
             checkVariableLikeDeclaration(node);
         }
         function checkMethodDeclaration(node) {
+            // Grammar checking
             if (!checkGrammarMethod(node))
                 checkGrammarComputedPropertyName(node.name);
+            // Grammar checking for modifiers is done inside the function checkGrammarFunctionLikeDeclaration
             checkFunctionOrMethodDeclaration(node);
-            if (ts.hasModifier(node, 128) && node.kind === 154 && node.body) {
+            // Abstract methods cannot have an implementation.
+            // Extra checks are to avoid reporting multiple errors relating to the "abstractness" of the node.
+            if (ts.hasModifier(node, 128 /* Abstract */) && node.kind === 154 /* MethodDeclaration */ && node.body) {
                 error(node, ts.Diagnostics.Method_0_cannot_have_an_implementation_because_it_is_marked_abstract, ts.declarationNameToString(node.name));
             }
         }
         function checkConstructorDeclaration(node) {
+            // Grammar check on signature of constructor and modifier of the constructor is done in checkSignatureDeclaration function.
             checkSignatureDeclaration(node);
+            // Grammar check for checking only related to constructorDeclaration
             if (!checkGrammarConstructorTypeParameters(node))
                 checkGrammarConstructorTypeAnnotation(node);
             checkSourceElement(node.body);
             var symbol = getSymbolOfNode(node);
             var firstDeclaration = ts.getDeclarationOfKind(symbol, node.kind);
+            // Only type check the symbol once
             if (node === firstDeclaration) {
                 checkFunctionOrConstructorSymbol(symbol);
             }
+            // exit early in the case of signature - super checks are not relevant to them
             if (ts.nodeIsMissing(node.body)) {
                 return;
             }
@@ -38230,10 +48601,13 @@ var ts;
                 return;
             }
             function isInstancePropertyWithInitializer(n) {
-                return n.kind === 152 &&
-                    !ts.hasModifier(n, 32) &&
+                return n.kind === 152 /* PropertyDeclaration */ &&
+                    !ts.hasModifier(n, 32 /* Static */) &&
                     !!n.initializer;
             }
+            // TS 1.0 spec (April 2014): 8.3.2
+            // Constructors of classes with no extends clause may not contain super calls, whereas
+            // constructors of derived classes must contain at least one super call somewhere in their function body.
             var containingClassDecl = node.parent;
             if (ts.getClassExtendsHeritageClauseElement(containingClassDecl)) {
                 captureLexicalThis(node.parent, containingClassDecl);
@@ -38243,14 +48617,21 @@ var ts;
                     if (classExtendsNull) {
                         error(superCall, ts.Diagnostics.A_constructor_cannot_contain_a_super_call_when_its_class_extends_null);
                     }
+                    // The first statement in the body of a constructor (excluding prologue directives) must be a super call
+                    // if both of the following are true:
+                    // - The containing class is a derived class.
+                    // - The constructor declares parameter properties
+                    //   or the containing class declares instance member variables with initializers.
                     var superCallShouldBeFirst = ts.some(node.parent.members, isInstancePropertyWithInitializer) ||
-                        ts.some(node.parameters, function (p) { return ts.hasModifier(p, 92); });
+                        ts.some(node.parameters, function (p) { return ts.hasModifier(p, 92 /* ParameterPropertyModifier */); });
+                    // Skip past any prologue directives to find the first statement
+                    // to ensure that it was a super call.
                     if (superCallShouldBeFirst) {
                         var statements = node.body.statements;
                         var superCallStatement = void 0;
                         for (var _i = 0, statements_2 = statements; _i < statements_2.length; _i++) {
                             var statement = statements_2[_i];
-                            if (statement.kind === 216 && ts.isSuperCall(statement.expression)) {
+                            if (statement.kind === 216 /* ExpressionStatement */ && ts.isSuperCall(statement.expression)) {
                                 superCallStatement = statement;
                                 break;
                             }
@@ -38270,38 +48651,46 @@ var ts;
         }
         function checkAccessorDeclaration(node) {
             if (produceDiagnostics) {
+                // Grammar checking accessors
                 if (!checkGrammarFunctionLikeDeclaration(node) && !checkGrammarAccessor(node))
                     checkGrammarComputedPropertyName(node.name);
                 checkDecorators(node);
                 checkSignatureDeclaration(node);
-                if (node.kind === 156) {
-                    if (!(node.flags & 4194304) && ts.nodeIsPresent(node.body) && (node.flags & 128)) {
-                        if (!(node.flags & 256)) {
+                if (node.kind === 156 /* GetAccessor */) {
+                    if (!(node.flags & 4194304 /* Ambient */) && ts.nodeIsPresent(node.body) && (node.flags & 128 /* HasImplicitReturn */)) {
+                        if (!(node.flags & 256 /* HasExplicitReturn */)) {
                             error(node.name, ts.Diagnostics.A_get_accessor_must_return_a_value);
                         }
                     }
                 }
-                if (node.name.kind === 147) {
+                // Do not use hasDynamicName here, because that returns false for well known symbols.
+                // We want to perform checkComputedPropertyName for all computed properties, including
+                // well known symbols.
+                if (node.name.kind === 147 /* ComputedPropertyName */) {
                     checkComputedPropertyName(node.name);
                 }
                 if (!hasNonBindableDynamicName(node)) {
-                    var otherKind = node.kind === 156 ? 157 : 156;
+                    // TypeScript 1.0 spec (April 2014): 8.4.3
+                    // Accessors for the same member name must specify the same accessibility.
+                    var otherKind = node.kind === 156 /* GetAccessor */ ? 157 /* SetAccessor */ : 156 /* GetAccessor */;
                     var otherAccessor = ts.getDeclarationOfKind(getSymbolOfNode(node), otherKind);
                     if (otherAccessor) {
                         var nodeFlags = ts.getModifierFlags(node);
                         var otherFlags = ts.getModifierFlags(otherAccessor);
-                        if ((nodeFlags & 28) !== (otherFlags & 28)) {
+                        if ((nodeFlags & 28 /* AccessibilityModifier */) !== (otherFlags & 28 /* AccessibilityModifier */)) {
                             error(node.name, ts.Diagnostics.Getter_and_setter_accessors_do_not_agree_in_visibility);
                         }
-                        if ((nodeFlags & 128) !== (otherFlags & 128)) {
+                        if ((nodeFlags & 128 /* Abstract */) !== (otherFlags & 128 /* Abstract */)) {
                             error(node.name, ts.Diagnostics.Accessors_must_both_be_abstract_or_non_abstract);
                         }
+                        // TypeScript 1.0 spec (April 2014): 4.5
+                        // If both accessors include type annotations, the specified types must be identical.
                         checkAccessorDeclarationTypesIdentical(node, otherAccessor, getAnnotatedAccessorType, ts.Diagnostics.get_and_set_accessor_must_have_the_same_type);
                         checkAccessorDeclarationTypesIdentical(node, otherAccessor, getThisTypeOfDeclaration, ts.Diagnostics.get_and_set_accessor_must_have_the_same_this_type);
                     }
                 }
                 var returnType = getTypeOfAccessors(getSymbolOfNode(node));
-                if (node.kind === 156) {
+                if (node.kind === 156 /* GetAccessor */) {
                     checkAllCodePathsInNonVoidFunctionReturnOrThrow(node, returnType);
                 }
             }
@@ -38341,20 +48730,21 @@ var ts;
             if (type !== errorType) {
                 var symbol = getNodeLinks(node).resolvedSymbol;
                 if (symbol) {
-                    return symbol.flags & 524288 && getSymbolLinks(symbol).typeParameters ||
-                        (ts.getObjectFlags(type) & 4 ? type.target.localTypeParameters : undefined);
+                    return symbol.flags & 524288 /* TypeAlias */ && getSymbolLinks(symbol).typeParameters ||
+                        (ts.getObjectFlags(type) & 4 /* Reference */ ? type.target.localTypeParameters : undefined);
                 }
             }
             return undefined;
         }
         function checkTypeReferenceNode(node) {
             checkGrammarTypeArguments(node, node.typeArguments);
-            if (node.kind === 162 && node.typeName.jsdocDotPos !== undefined && !ts.isInJavaScriptFile(node) && !ts.isInJSDoc(node)) {
+            if (node.kind === 162 /* TypeReference */ && node.typeName.jsdocDotPos !== undefined && !ts.isInJavaScriptFile(node) && !ts.isInJSDoc(node)) {
                 grammarErrorAtPos(node, node.typeName.jsdocDotPos, 1, ts.Diagnostics.JSDoc_types_can_only_be_used_inside_documentation_comments);
             }
             var type = getTypeFromTypeReference(node);
             if (type !== errorType) {
                 if (node.typeArguments) {
+                    // Do type argument local checks only if referenced type is successfully resolved
                     ts.forEach(node.typeArguments, checkSourceElement);
                     if (produceDiagnostics) {
                         var typeParameters = getTypeParametersForTypeReference(node);
@@ -38363,7 +48753,7 @@ var ts;
                         }
                     }
                 }
-                if (type.flags & 32 && getNodeLinks(node).resolvedSymbol.flags & 8) {
+                if (type.flags & 32 /* Enum */ && getNodeLinks(node).resolvedSymbol.flags & 8 /* EnumMember */) {
                     error(node, ts.Diagnostics.Enum_type_0_has_members_with_initializers_that_are_not_literals, typeToString(type));
                 }
             }
@@ -38372,7 +48762,7 @@ var ts;
             var typeReferenceNode = ts.tryCast(node.parent, ts.isTypeReferenceType);
             if (!typeReferenceNode)
                 return undefined;
-            var typeParameters = getTypeParametersForTypeReference(typeReferenceNode);
+            var typeParameters = getTypeParametersForTypeReference(typeReferenceNode); // TODO: GH#18217
             var constraint = getConstraintOfTypeParameter(typeParameters[typeReferenceNode.typeArguments.indexOf(node)]);
             return constraint && instantiateType(constraint, createTypeMapper(typeParameters, getEffectiveTypeArguments(typeReferenceNode, typeParameters)));
         }
@@ -38392,6 +48782,7 @@ var ts;
             checkSourceElement(node.elementType);
         }
         function checkTupleType(node) {
+            // Grammar checking
             var hasErrorFromDisallowedTrailingComma = checkGrammarForDisallowedTrailingComma(node.elementTypes);
             if (!hasErrorFromDisallowedTrailingComma && node.elementTypes.length === 0) {
                 grammarErrorOnNode(node, ts.Diagnostics.A_tuple_type_element_list_cannot_be_empty);
@@ -38402,19 +48793,22 @@ var ts;
             ts.forEach(node.types, checkSourceElement);
         }
         function checkIndexedAccessIndexType(type, accessNode) {
-            if (!(type.flags & 2097152)) {
+            if (!(type.flags & 2097152 /* IndexedAccess */)) {
                 return type;
             }
+            // Check if the index type is assignable to 'keyof T' for the object type.
             var objectType = type.objectType;
             var indexType = type.indexType;
-            if (isTypeAssignableTo(indexType, getIndexType(objectType, false))) {
-                if (accessNode.kind === 186 && ts.isAssignmentTarget(accessNode) &&
-                    ts.getObjectFlags(objectType) & 32 && getMappedTypeModifiers(objectType) & 1) {
+            if (isTypeAssignableTo(indexType, getIndexType(objectType, /*stringsOnly*/ false))) {
+                if (accessNode.kind === 186 /* ElementAccessExpression */ && ts.isAssignmentTarget(accessNode) &&
+                    ts.getObjectFlags(objectType) & 32 /* Mapped */ && getMappedTypeModifiers(objectType) & 1 /* IncludeReadonly */) {
                     error(accessNode, ts.Diagnostics.Index_signature_in_type_0_only_permits_reading, typeToString(objectType));
                 }
                 return type;
             }
-            if (getIndexInfoOfType(getApparentType(objectType), 1) && isTypeAssignableToKind(indexType, 168)) {
+            // Check if we're indexing with a numeric type and if either object or index types
+            // is a generic type with a constraint that has a numeric index signature.
+            if (getIndexInfoOfType(getApparentType(objectType), 1 /* Number */) && isTypeAssignableToKind(indexType, 168 /* NumberLike */)) {
                 return type;
             }
             error(accessNode, ts.Diagnostics.Type_0_cannot_be_used_to_index_type_1, typeToString(indexType), typeToString(objectType));
@@ -38443,7 +48837,7 @@ var ts;
             ts.forEachChild(node, checkSourceElement);
         }
         function checkInferType(node) {
-            if (!ts.findAncestor(node, function (n) { return n.parent && n.parent.kind === 171 && n.parent.extendsType === n; })) {
+            if (!ts.findAncestor(node, function (n) { return n.parent && n.parent.kind === 171 /* ConditionalType */ && n.parent.extendsType === n; })) {
                 grammarErrorOnNode(node, ts.Diagnostics.infer_declarations_are_only_permitted_in_the_extends_clause_of_a_conditional_type);
             }
             checkSourceElement(node.typeParameter);
@@ -38453,18 +48847,21 @@ var ts;
             getTypeFromTypeNode(node);
         }
         function isPrivateWithinAmbient(node) {
-            return ts.hasModifier(node, 8) && !!(node.flags & 4194304);
+            return ts.hasModifier(node, 8 /* Private */) && !!(node.flags & 4194304 /* Ambient */);
         }
         function getEffectiveDeclarationFlags(n, flagsToCheck) {
             var flags = ts.getCombinedModifierFlags(n);
-            if (n.parent.kind !== 236 &&
-                n.parent.kind !== 235 &&
-                n.parent.kind !== 205 &&
-                n.flags & 4194304) {
-                if (!(flags & 2) && !(ts.isModuleBlock(n.parent) && ts.isModuleDeclaration(n.parent.parent) && ts.isGlobalScopeAugmentation(n.parent.parent))) {
-                    flags |= 1;
+            // children of classes (even ambient classes) should not be marked as ambient or export
+            // because those flags have no useful semantics there.
+            if (n.parent.kind !== 236 /* InterfaceDeclaration */ &&
+                n.parent.kind !== 235 /* ClassDeclaration */ &&
+                n.parent.kind !== 205 /* ClassExpression */ &&
+                n.flags & 4194304 /* Ambient */) {
+                if (!(flags & 2 /* Ambient */) && !(ts.isModuleBlock(n.parent) && ts.isModuleDeclaration(n.parent.parent) && ts.isGlobalScopeAugmentation(n.parent.parent))) {
+                    // It is nested in an ambient context, which means it is automatically exported
+                    flags |= 1 /* Export */;
                 }
-                flags |= 2;
+                flags |= 2 /* Ambient */;
             }
             return flags & flagsToCheck;
         }
@@ -38473,25 +48870,32 @@ var ts;
                 return;
             }
             function getCanonicalOverload(overloads, implementation) {
+                // Consider the canonical set of flags to be the flags of the bodyDeclaration or the first declaration
+                // Error on all deviations from this canonical set of flags
+                // The caveat is that if some overloads are defined in lib.d.ts, we don't want to
+                // report the errors on those. To achieve this, we will say that the implementation is
+                // the canonical signature only if it is in the same container as the first overload
                 var implementationSharesContainerWithFirstOverload = implementation !== undefined && implementation.parent === overloads[0].parent;
                 return implementationSharesContainerWithFirstOverload ? implementation : overloads[0];
             }
             function checkFlagAgreementBetweenOverloads(overloads, implementation, flagsToCheck, someOverloadFlags, allOverloadFlags) {
+                // Error if some overloads have a flag that is not shared by all overloads. To find the
+                // deviations, we XOR someOverloadFlags with allOverloadFlags
                 var someButNotAllOverloadFlags = someOverloadFlags ^ allOverloadFlags;
                 if (someButNotAllOverloadFlags !== 0) {
                     var canonicalFlags_1 = getEffectiveDeclarationFlags(getCanonicalOverload(overloads, implementation), flagsToCheck);
                     ts.forEach(overloads, function (o) {
                         var deviation = getEffectiveDeclarationFlags(o, flagsToCheck) ^ canonicalFlags_1;
-                        if (deviation & 1) {
+                        if (deviation & 1 /* Export */) {
                             error(ts.getNameOfDeclaration(o), ts.Diagnostics.Overload_signatures_must_all_be_exported_or_non_exported);
                         }
-                        else if (deviation & 2) {
+                        else if (deviation & 2 /* Ambient */) {
                             error(ts.getNameOfDeclaration(o), ts.Diagnostics.Overload_signatures_must_all_be_ambient_or_non_ambient);
                         }
-                        else if (deviation & (8 | 16)) {
+                        else if (deviation & (8 /* Private */ | 16 /* Protected */)) {
                             error(ts.getNameOfDeclaration(o) || o, ts.Diagnostics.Overload_signatures_must_all_be_public_private_or_protected);
                         }
-                        else if (deviation & 128) {
+                        else if (deviation & 128 /* Abstract */) {
                             error(ts.getNameOfDeclaration(o), ts.Diagnostics.Overload_signatures_must_all_be_abstract_or_non_abstract);
                         }
                     });
@@ -38508,8 +48912,8 @@ var ts;
                     });
                 }
             }
-            var flagsToCheck = 1 | 2 | 8 | 16 | 128;
-            var someNodeFlags = 0;
+            var flagsToCheck = 1 /* Export */ | 2 /* Ambient */ | 8 /* Private */ | 16 /* Protected */ | 128 /* Abstract */;
+            var someNodeFlags = 0 /* None */;
             var allNodeFlags = flagsToCheck;
             var someHaveQuestionToken = false;
             var allHaveQuestionToken = true;
@@ -38518,7 +48922,7 @@ var ts;
             var lastSeenNonAmbientDeclaration;
             var previousDeclaration;
             var declarations = symbol.declarations;
-            var isConstructor = (symbol.flags & 16384) !== 0;
+            var isConstructor = (symbol.flags & 16384 /* Constructor */) !== 0;
             function reportImplementationExpectedError(node) {
                 if (node.name && ts.nodeIsMissing(node.name)) {
                     return;
@@ -38532,17 +48936,24 @@ var ts;
                         seen = c === node;
                     }
                 });
+                // We may be here because of some extra nodes between overloads that could not be parsed into a valid node.
+                // In this case the subsequent node is not really consecutive (.pos !== node.end), and we must ignore it here.
                 if (subsequentNode && subsequentNode.pos === node.end) {
                     if (subsequentNode.kind === node.kind) {
                         var errorNode_1 = subsequentNode.name || subsequentNode;
+                        // TODO: GH#17345: These are methods, so handle computed name case. (`Always allowing computed property names is *not* the correct behavior!)
                         var subsequentName = subsequentNode.name;
                         if (node.name && subsequentName &&
                             (ts.isComputedPropertyName(node.name) && ts.isComputedPropertyName(subsequentName) ||
                                 !ts.isComputedPropertyName(node.name) && !ts.isComputedPropertyName(subsequentName) && ts.getEscapedTextOfIdentifierOrLiteral(node.name) === ts.getEscapedTextOfIdentifierOrLiteral(subsequentName))) {
-                            var reportError = (node.kind === 154 || node.kind === 153) &&
-                                ts.hasModifier(node, 32) !== ts.hasModifier(subsequentNode, 32);
+                            var reportError = (node.kind === 154 /* MethodDeclaration */ || node.kind === 153 /* MethodSignature */) &&
+                                ts.hasModifier(node, 32 /* Static */) !== ts.hasModifier(subsequentNode, 32 /* Static */);
+                            // we can get here in two cases
+                            // 1. mixed static and instance class members
+                            // 2. something with the same name was defined before the set of overloads that prevents them from merging
+                            // here we'll report error only for the first case since for second we should already report error in binder
                             if (reportError) {
-                                var diagnostic = ts.hasModifier(node, 32) ? ts.Diagnostics.Function_overload_must_be_static : ts.Diagnostics.Function_overload_must_not_be_static;
+                                var diagnostic = ts.hasModifier(node, 32 /* Static */) ? ts.Diagnostics.Function_overload_must_be_static : ts.Diagnostics.Function_overload_must_not_be_static;
                                 error(errorNode_1, diagnostic);
                             }
                             return;
@@ -38558,7 +48969,9 @@ var ts;
                     error(errorNode, ts.Diagnostics.Constructor_implementation_is_missing);
                 }
                 else {
-                    if (ts.hasModifier(node, 128)) {
+                    // Report different errors regarding non-consecutive blocks of declarations depending on whether
+                    // the node in question is abstract.
+                    if (ts.hasModifier(node, 128 /* Abstract */)) {
                         error(errorNode, ts.Diagnostics.All_declarations_of_an_abstract_method_must_be_consecutive);
                     }
                     else {
@@ -38568,15 +48981,22 @@ var ts;
             }
             var duplicateFunctionDeclaration = false;
             var multipleConstructorImplementation = false;
-            for (var _i = 0, declarations_4 = declarations; _i < declarations_4.length; _i++) {
-                var current = declarations_4[_i];
+            for (var _i = 0, declarations_3 = declarations; _i < declarations_3.length; _i++) {
+                var current = declarations_3[_i];
                 var node = current;
-                var inAmbientContext = node.flags & 4194304;
-                var inAmbientContextOrInterface = node.parent.kind === 236 || node.parent.kind === 166 || inAmbientContext;
+                var inAmbientContext = node.flags & 4194304 /* Ambient */;
+                var inAmbientContextOrInterface = node.parent.kind === 236 /* InterfaceDeclaration */ || node.parent.kind === 166 /* TypeLiteral */ || inAmbientContext;
                 if (inAmbientContextOrInterface) {
+                    // check if declarations are consecutive only if they are non-ambient
+                    // 1. ambient declarations can be interleaved
+                    // i.e. this is legal
+                    //     declare function foo();
+                    //     declare function bar();
+                    //     declare function foo();
+                    // 2. mixing ambient and non-ambient declarations is a separate error that will be reported - do not want to report an extra one
                     previousDeclaration = undefined;
                 }
-                if (node.kind === 234 || node.kind === 154 || node.kind === 153 || node.kind === 155) {
+                if (node.kind === 234 /* FunctionDeclaration */ || node.kind === 154 /* MethodDeclaration */ || node.kind === 153 /* MethodSignature */ || node.kind === 155 /* Constructor */) {
                     var currentNodeFlags = getEffectiveDeclarationFlags(node, flagsToCheck);
                     someNodeFlags |= currentNodeFlags;
                     allNodeFlags &= currentNodeFlags;
@@ -38617,8 +49037,9 @@ var ts;
                     error(ts.getNameOfDeclaration(declaration), ts.Diagnostics.Duplicate_function_implementation);
                 });
             }
+            // Abstract methods can't have an implementation -- in particular, they don't need one.
             if (lastSeenNonAmbientDeclaration && !lastSeenNonAmbientDeclaration.body &&
-                !ts.hasModifier(lastSeenNonAmbientDeclaration, 128) && !lastSeenNonAmbientDeclaration.questionToken) {
+                !ts.hasModifier(lastSeenNonAmbientDeclaration, 128 /* Abstract */) && !lastSeenNonAmbientDeclaration.questionToken) {
                 reportImplementationExpectedError(lastSeenNonAmbientDeclaration);
             }
             if (hasOverloads) {
@@ -38641,25 +49062,30 @@ var ts;
             if (!produceDiagnostics) {
                 return;
             }
+            // if localSymbol is defined on node then node itself is exported - check is required
             var symbol = node.localSymbol;
             if (!symbol) {
+                // local symbol is undefined => this declaration is non-exported.
+                // however symbol might contain other declarations that are exported
                 symbol = getSymbolOfNode(node);
                 if (!symbol.exportSymbol) {
+                    // this is a pure local symbol (all declarations are non-exported) - no need to check anything
                     return;
                 }
             }
+            // run the check only for the first declaration in the list
             if (ts.getDeclarationOfKind(symbol, node.kind) !== node) {
                 return;
             }
-            var exportedDeclarationSpaces = 0;
-            var nonExportedDeclarationSpaces = 0;
-            var defaultExportedDeclarationSpaces = 0;
+            var exportedDeclarationSpaces = 0 /* None */;
+            var nonExportedDeclarationSpaces = 0 /* None */;
+            var defaultExportedDeclarationSpaces = 0 /* None */;
             for (var _i = 0, _a = symbol.declarations; _i < _a.length; _i++) {
                 var d = _a[_i];
                 var declarationSpaces = getDeclarationSpaces(d);
-                var effectiveDeclarationFlags = getEffectiveDeclarationFlags(d, 1 | 512);
-                if (effectiveDeclarationFlags & 1) {
-                    if (effectiveDeclarationFlags & 512) {
+                var effectiveDeclarationFlags = getEffectiveDeclarationFlags(d, 1 /* Export */ | 512 /* Default */);
+                if (effectiveDeclarationFlags & 1 /* Export */) {
+                    if (effectiveDeclarationFlags & 512 /* Default */) {
                         defaultExportedDeclarationSpaces |= declarationSpaces;
                     }
                     else {
@@ -38670,14 +49096,17 @@ var ts;
                     nonExportedDeclarationSpaces |= declarationSpaces;
                 }
             }
+            // Spaces for anything not declared a 'default export'.
             var nonDefaultExportedDeclarationSpaces = exportedDeclarationSpaces | nonExportedDeclarationSpaces;
             var commonDeclarationSpacesForExportsAndLocals = exportedDeclarationSpaces & nonExportedDeclarationSpaces;
             var commonDeclarationSpacesForDefaultAndNonDefault = defaultExportedDeclarationSpaces & nonDefaultExportedDeclarationSpaces;
             if (commonDeclarationSpacesForExportsAndLocals || commonDeclarationSpacesForDefaultAndNonDefault) {
+                // declaration spaces for exported and non-exported declarations intersect
                 for (var _b = 0, _c = symbol.declarations; _b < _c.length; _b++) {
                     var d = _c[_b];
                     var declarationSpaces = getDeclarationSpaces(d);
                     var name = ts.getNameOfDeclaration(d);
+                    // Only error on the declarations that contributed to the intersecting spaces.
                     if (declarationSpaces & commonDeclarationSpacesForDefaultAndNonDefault) {
                         error(name, ts.Diagnostics.Merged_declaration_0_cannot_include_a_default_export_declaration_Consider_adding_a_separate_export_default_0_declaration_instead, ts.declarationNameToString(name));
                     }
@@ -38686,40 +49115,51 @@ var ts;
                     }
                 }
             }
+            var DeclarationSpaces;
+            (function (DeclarationSpaces) {
+                DeclarationSpaces[DeclarationSpaces["None"] = 0] = "None";
+                DeclarationSpaces[DeclarationSpaces["ExportValue"] = 1] = "ExportValue";
+                DeclarationSpaces[DeclarationSpaces["ExportType"] = 2] = "ExportType";
+                DeclarationSpaces[DeclarationSpaces["ExportNamespace"] = 4] = "ExportNamespace";
+            })(DeclarationSpaces || (DeclarationSpaces = {}));
             function getDeclarationSpaces(decl) {
                 var d = decl;
                 switch (d.kind) {
-                    case 236:
-                    case 237:
-                    case 297:
-                    case 292:
-                        return 2;
-                    case 239:
-                        return ts.isAmbientModule(d) || ts.getModuleInstanceState(d) !== 0
-                            ? 4 | 1
-                            : 4;
-                    case 235:
-                    case 238:
-                        return 2 | 1;
-                    case 274:
-                        return 2 | 1 | 4;
-                    case 249:
+                    case 236 /* InterfaceDeclaration */:
+                    case 237 /* TypeAliasDeclaration */:
+                    // A jsdoc typedef and callback are, by definition, type aliases
+                    case 297 /* JSDocTypedefTag */:
+                    case 292 /* JSDocCallbackTag */:
+                        return 2 /* ExportType */;
+                    case 239 /* ModuleDeclaration */:
+                        return ts.isAmbientModule(d) || ts.getModuleInstanceState(d) !== 0 /* NonInstantiated */
+                            ? 4 /* ExportNamespace */ | 1 /* ExportValue */
+                            : 4 /* ExportNamespace */;
+                    case 235 /* ClassDeclaration */:
+                    case 238 /* EnumDeclaration */:
+                        return 2 /* ExportType */ | 1 /* ExportValue */;
+                    case 274 /* SourceFile */:
+                        return 2 /* ExportType */ | 1 /* ExportValue */ | 4 /* ExportNamespace */;
+                    case 249 /* ExportAssignment */:
+                        // Export assigned entity name expressions act as aliases and should fall through, otherwise they export values
                         if (!ts.isEntityNameExpression(d.expression)) {
-                            return 1;
+                            return 1 /* ExportValue */;
                         }
                         d = d.expression;
-                    case 243:
-                    case 246:
-                    case 245:
-                        var result_3 = 0;
+                    /* falls through */
+                    // The below options all declare an Alias, which is allowed to merge with other values within the importing module
+                    case 243 /* ImportEqualsDeclaration */:
+                    case 246 /* NamespaceImport */:
+                    case 245 /* ImportClause */:
+                        var result_2 = 0 /* None */;
                         var target = resolveAlias(getSymbolOfNode(d));
-                        ts.forEach(target.declarations, function (d) { result_3 |= getDeclarationSpaces(d); });
-                        return result_3;
-                    case 232:
-                    case 182:
-                    case 234:
-                    case 248:
-                        return 1;
+                        ts.forEach(target.declarations, function (d) { result_2 |= getDeclarationSpaces(d); });
+                        return result_2;
+                    case 232 /* VariableDeclaration */:
+                    case 182 /* BindingElement */:
+                    case 234 /* FunctionDeclaration */:
+                    case 248 /* ImportSpecifier */: // https://github.com/Microsoft/TypeScript/pull/7591
+                        return 1 /* ExportValue */;
                     default:
                         return ts.Debug.fail(ts.Debug.showSyntaxKind(d));
                 }
@@ -38729,7 +49169,21 @@ var ts;
             var promisedType = getPromisedTypeOfPromise(type, errorNode);
             return promisedType && getAwaitedType(promisedType, errorNode, diagnosticMessage);
         }
+        /**
+         * Gets the "promised type" of a promise.
+         * @param type The type of the promise.
+         * @remarks The "promised type" of a type is the type of the "value" parameter of the "onfulfilled" callback.
+         */
         function getPromisedTypeOfPromise(promise, errorNode) {
+            //
+            //  { // promise
+            //      then( // thenFunction
+            //          onfulfilled: ( // onfulfilledParameterType
+            //              value: T // valueParameterType
+            //          ) => any
+            //      ): any;
+            //  }
+            //
             if (isTypeAny(promise)) {
                 return undefined;
             }
@@ -38737,33 +49191,40 @@ var ts;
             if (typeAsPromise.promisedTypeOfPromise) {
                 return typeAsPromise.promisedTypeOfPromise;
             }
-            if (isReferenceToType(promise, getGlobalPromiseType(false))) {
+            if (isReferenceToType(promise, getGlobalPromiseType(/*reportErrors*/ false))) {
                 return typeAsPromise.promisedTypeOfPromise = promise.typeArguments[0];
             }
-            var thenFunction = getTypeOfPropertyOfType(promise, "then");
+            var thenFunction = getTypeOfPropertyOfType(promise, "then"); // TODO: GH#18217
             if (isTypeAny(thenFunction)) {
                 return undefined;
             }
-            var thenSignatures = thenFunction ? getSignaturesOfType(thenFunction, 0) : ts.emptyArray;
+            var thenSignatures = thenFunction ? getSignaturesOfType(thenFunction, 0 /* Call */) : ts.emptyArray;
             if (thenSignatures.length === 0) {
                 if (errorNode) {
                     error(errorNode, ts.Diagnostics.A_promise_must_have_a_then_method);
                 }
                 return undefined;
             }
-            var onfulfilledParameterType = getTypeWithFacts(getUnionType(ts.map(thenSignatures, getTypeOfFirstParameterOfSignature)), 524288);
+            var onfulfilledParameterType = getTypeWithFacts(getUnionType(ts.map(thenSignatures, getTypeOfFirstParameterOfSignature)), 524288 /* NEUndefinedOrNull */);
             if (isTypeAny(onfulfilledParameterType)) {
                 return undefined;
             }
-            var onfulfilledParameterSignatures = getSignaturesOfType(onfulfilledParameterType, 0);
+            var onfulfilledParameterSignatures = getSignaturesOfType(onfulfilledParameterType, 0 /* Call */);
             if (onfulfilledParameterSignatures.length === 0) {
                 if (errorNode) {
                     error(errorNode, ts.Diagnostics.The_first_parameter_of_the_then_method_of_a_promise_must_be_a_callback);
                 }
                 return undefined;
             }
-            return typeAsPromise.promisedTypeOfPromise = getUnionType(ts.map(onfulfilledParameterSignatures, getTypeOfFirstParameterOfSignature), 2);
+            return typeAsPromise.promisedTypeOfPromise = getUnionType(ts.map(onfulfilledParameterSignatures, getTypeOfFirstParameterOfSignature), 2 /* Subtype */);
         }
+        /**
+         * Gets the "awaited type" of a type.
+         * @param type The type to await.
+         * @remarks The "awaited type" of an expression is its "promised type" if the expression is a
+         * Promise-like type; otherwise, it is the type of the expression. This is used to reflect
+         * The runtime behavior of the `await` keyword.
+         */
         function checkAwaitedType(type, errorNode, diagnosticMessage) {
             return getAwaitedType(type, errorNode, diagnosticMessage) || errorType;
         }
@@ -38775,7 +49236,7 @@ var ts;
             if (isTypeAny(type)) {
                 return typeAsAwaitable.awaitedTypeOfType = type;
             }
-            if (type.flags & 262144) {
+            if (type.flags & 262144 /* Union */) {
                 var types = void 0;
                 for (var _i = 0, _a = type.types; _i < _a.length; _i++) {
                     var constituentType = _a[_i];
@@ -38789,11 +49250,45 @@ var ts;
             var promisedType = getPromisedTypeOfPromise(type);
             if (promisedType) {
                 if (type.id === promisedType.id || awaitedTypeStack.indexOf(promisedType.id) >= 0) {
+                    // Verify that we don't have a bad actor in the form of a promise whose
+                    // promised type is the same as the promise type, or a mutually recursive
+                    // promise. If so, we return undefined as we cannot guess the shape. If this
+                    // were the actual case in the JavaScript, this Promise would never resolve.
+                    //
+                    // An example of a bad actor with a singly-recursive promise type might
+                    // be:
+                    //
+                    //  interface BadPromise {
+                    //      then(
+                    //          onfulfilled: (value: BadPromise) => any,
+                    //          onrejected: (error: any) => any): BadPromise;
+                    //  }
+                    // The above interface will pass the PromiseLike check, and return a
+                    // promised type of `BadPromise`. Since this is a self reference, we
+                    // don't want to keep recursing ad infinitum.
+                    //
+                    // An example of a bad actor in the form of a mutually-recursive
+                    // promise type might be:
+                    //
+                    //  interface BadPromiseA {
+                    //      then(
+                    //          onfulfilled: (value: BadPromiseB) => any,
+                    //          onrejected: (error: any) => any): BadPromiseB;
+                    //  }
+                    //
+                    //  interface BadPromiseB {
+                    //      then(
+                    //          onfulfilled: (value: BadPromiseA) => any,
+                    //          onrejected: (error: any) => any): BadPromiseA;
+                    //  }
+                    //
                     if (errorNode) {
                         error(errorNode, ts.Diagnostics.Type_is_referenced_directly_or_indirectly_in_the_fulfillment_callback_of_its_own_then_method);
                     }
                     return undefined;
                 }
+                // Keep track of the type we're about to unwrap to avoid bad recursive promise types.
+                // See the comments above for more information.
                 awaitedTypeStack.push(type.id);
                 var awaitedType = getAwaitedType(promisedType, errorNode, diagnosticMessage);
                 awaitedTypeStack.pop();
@@ -38802,8 +49297,23 @@ var ts;
                 }
                 return typeAsAwaitable.awaitedTypeOfType = awaitedType;
             }
+            // The type was not a promise, so it could not be unwrapped any further.
+            // As long as the type does not have a callable "then" property, it is
+            // safe to return the type; otherwise, an error will be reported in
+            // the call to getNonThenableType and we will return undefined.
+            //
+            // An example of a non-promise "thenable" might be:
+            //
+            //  await { then(): void {} }
+            //
+            // The "thenable" does not match the minimal definition for a promise. When
+            // a Promise/A+-compatible or ES6 promise tries to adopt this value, the promise
+            // will never settle. We treat this as an error to help flag an early indicator
+            // of a runtime problem. If the user wants to return this value from an async
+            // function, they would need to wrap it in some other value. If they want it to
+            // be treated as a promise, they can cast to <any>.
             var thenFunction = getTypeOfPropertyOfType(type, "then");
-            if (thenFunction && getSignaturesOfType(thenFunction, 0).length > 0) {
+            if (thenFunction && getSignaturesOfType(thenFunction, 0 /* Call */).length > 0) {
                 if (errorNode) {
                     if (!diagnosticMessage)
                         return ts.Debug.fail();
@@ -38813,20 +49323,60 @@ var ts;
             }
             return typeAsAwaitable.awaitedTypeOfType = type;
         }
+        /**
+         * Checks the return type of an async function to ensure it is a compatible
+         * Promise implementation.
+         *
+         * This checks that an async function has a valid Promise-compatible return type,
+         * and returns the *awaited type* of the promise. An async function has a valid
+         * Promise-compatible return type if the resolved value of the return type has a
+         * construct signature that takes in an `initializer` function that in turn supplies
+         * a `resolve` function as one of its arguments and results in an object with a
+         * callable `then` signature.
+         *
+         * @param node The signature to check
+         */
         function checkAsyncFunctionReturnType(node) {
-            var returnTypeNode = ts.getEffectiveReturnTypeNode(node);
+            // As part of our emit for an async function, we will need to emit the entity name of
+            // the return type annotation as an expression. To meet the necessary runtime semantics
+            // for __awaiter, we must also check that the type of the declaration (e.g. the static
+            // side or "constructor" of the promise type) is compatible `PromiseConstructorLike`.
+            //
+            // An example might be (from lib.es6.d.ts):
+            //
+            //  interface Promise<T> { ... }
+            //  interface PromiseConstructor {
+            //      new <T>(...): Promise<T>;
+            //  }
+            //  declare var Promise: PromiseConstructor;
+            //
+            // When an async function declares a return type annotation of `Promise<T>`, we
+            // need to get the type of the `Promise` variable declaration above, which would
+            // be `PromiseConstructor`.
+            //
+            // The same case applies to a class:
+            //
+            //  declare class Promise<T> {
+            //      constructor(...);
+            //      then<U>(...): Promise<U>;
+            //  }
+            //
+            var returnTypeNode = ts.getEffectiveReturnTypeNode(node); // TODO: GH#18217
             var returnType = getTypeFromTypeNode(returnTypeNode);
-            if (languageVersion >= 2) {
+            if (languageVersion >= 2 /* ES2015 */) {
                 if (returnType === errorType) {
                     return errorType;
                 }
-                var globalPromiseType = getGlobalPromiseType(true);
+                var globalPromiseType = getGlobalPromiseType(/*reportErrors*/ true);
                 if (globalPromiseType !== emptyGenericType && !isReferenceToType(returnType, globalPromiseType)) {
+                    // The promise type was not a valid type reference to the global promise type, so we
+                    // report an error and return the unknown type.
                     error(returnTypeNode, ts.Diagnostics.The_return_type_of_an_async_function_or_method_must_be_the_global_Promise_T_type);
                     return errorType;
                 }
             }
             else {
+                // Always mark the type node as referenced if it points to a value
                 markTypeNodeAsReferenced(returnTypeNode);
                 if (returnType === errorType) {
                     return errorType;
@@ -38836,10 +49386,10 @@ var ts;
                     error(returnTypeNode, ts.Diagnostics.Type_0_is_not_a_valid_async_function_return_type_in_ES5_SlashES3_because_it_does_not_refer_to_a_Promise_compatible_constructor_value, typeToString(returnType));
                     return errorType;
                 }
-                var promiseConstructorSymbol = resolveEntityName(promiseConstructorName, 67216319, true);
+                var promiseConstructorSymbol = resolveEntityName(promiseConstructorName, 67216319 /* Value */, /*ignoreErrors*/ true);
                 var promiseConstructorType = promiseConstructorSymbol ? getTypeOfSymbol(promiseConstructorSymbol) : errorType;
                 if (promiseConstructorType === errorType) {
-                    if (promiseConstructorName.kind === 71 && promiseConstructorName.escapedText === "Promise" && getTargetType(returnType) === getGlobalPromiseType(false)) {
+                    if (promiseConstructorName.kind === 71 /* Identifier */ && promiseConstructorName.escapedText === "Promise" && getTargetType(returnType) === getGlobalPromiseType(/*reportErrors*/ false)) {
                         error(returnTypeNode, ts.Diagnostics.An_async_function_or_method_in_ES5_SlashES3_requires_the_Promise_constructor_Make_sure_you_have_a_declaration_for_the_Promise_constructor_or_include_ES2015_in_your_lib_option);
                     }
                     else {
@@ -38847,50 +49397,57 @@ var ts;
                     }
                     return errorType;
                 }
-                var globalPromiseConstructorLikeType = getGlobalPromiseConstructorLikeType(true);
+                var globalPromiseConstructorLikeType = getGlobalPromiseConstructorLikeType(/*reportErrors*/ true);
                 if (globalPromiseConstructorLikeType === emptyObjectType) {
+                    // If we couldn't resolve the global PromiseConstructorLike type we cannot verify
+                    // compatibility with __awaiter.
                     error(returnTypeNode, ts.Diagnostics.Type_0_is_not_a_valid_async_function_return_type_in_ES5_SlashES3_because_it_does_not_refer_to_a_Promise_compatible_constructor_value, ts.entityNameToString(promiseConstructorName));
                     return errorType;
                 }
                 if (!checkTypeAssignableTo(promiseConstructorType, globalPromiseConstructorLikeType, returnTypeNode, ts.Diagnostics.Type_0_is_not_a_valid_async_function_return_type_in_ES5_SlashES3_because_it_does_not_refer_to_a_Promise_compatible_constructor_value)) {
                     return errorType;
                 }
+                // Verify there is no local declaration that could collide with the promise constructor.
                 var rootName = promiseConstructorName && getFirstIdentifier(promiseConstructorName);
-                var collidingSymbol = getSymbol(node.locals, rootName.escapedText, 67216319);
+                var collidingSymbol = getSymbol(node.locals, rootName.escapedText, 67216319 /* Value */);
                 if (collidingSymbol) {
                     error(collidingSymbol.valueDeclaration, ts.Diagnostics.Duplicate_identifier_0_Compiler_uses_declaration_1_to_support_async_functions, ts.idText(rootName), ts.entityNameToString(promiseConstructorName));
                     return errorType;
                 }
             }
+            // Get and return the awaited type of the return type.
             return checkAwaitedType(returnType, node, ts.Diagnostics.The_return_type_of_an_async_function_must_either_be_a_valid_promise_or_must_not_contain_a_callable_then_member);
         }
+        /** Check a decorator */
         function checkDecorator(node) {
             var signature = getResolvedSignature(node);
             var returnType = getReturnTypeOfSignature(signature);
-            if (returnType.flags & 1) {
+            if (returnType.flags & 1 /* Any */) {
                 return;
             }
             var expectedReturnType;
             var headMessage = getDiagnosticHeadMessageForDecoratorResolution(node);
             var errorInfo;
             switch (node.parent.kind) {
-                case 235:
+                case 235 /* ClassDeclaration */:
                     var classSymbol = getSymbolOfNode(node.parent);
                     var classConstructorType = getTypeOfSymbol(classSymbol);
                     expectedReturnType = getUnionType([classConstructorType, voidType]);
                     break;
-                case 149:
+                case 149 /* Parameter */:
                     expectedReturnType = voidType;
-                    errorInfo = ts.chainDiagnosticMessages(undefined, ts.Diagnostics.The_return_type_of_a_parameter_decorator_function_must_be_either_void_or_any);
+                    errorInfo = ts.chainDiagnosticMessages(
+                    /*details*/ undefined, ts.Diagnostics.The_return_type_of_a_parameter_decorator_function_must_be_either_void_or_any);
                     break;
-                case 152:
+                case 152 /* PropertyDeclaration */:
                     expectedReturnType = voidType;
-                    errorInfo = ts.chainDiagnosticMessages(undefined, ts.Diagnostics.The_return_type_of_a_property_decorator_function_must_be_either_void_or_any);
+                    errorInfo = ts.chainDiagnosticMessages(
+                    /*details*/ undefined, ts.Diagnostics.The_return_type_of_a_property_decorator_function_must_be_either_void_or_any);
                     break;
-                case 154:
-                case 156:
-                case 157:
-                    var methodType = getTypeOfNode(node.parent);
+                case 154 /* MethodDeclaration */:
+                case 156 /* GetAccessor */:
+                case 157 /* SetAccessor */:
+                    var methodType = getTypeOfNode(node.parent); // TODO: GH#18217
                     var descriptorType = createTypedPropertyDescriptorType(methodType);
                     expectedReturnType = getUnionType([descriptorType, voidType]);
                     break;
@@ -38899,6 +49456,10 @@ var ts;
             }
             checkTypeAssignableTo(returnType, expectedReturnType, node, headMessage, function () { return errorInfo; });
         }
+        /**
+         * If a TypeNode can be resolved to a value symbol imported from an external module, it is
+         * marked as referenced to prevent import elision.
+         */
         function markTypeNodeAsReferenced(node) {
             markEntityNameOrEntityExpressionAsReference(node && ts.getEntityNameFromTypeNode(node));
         }
@@ -38906,15 +49467,22 @@ var ts;
             if (!typeName)
                 return;
             var rootName = getFirstIdentifier(typeName);
-            var meaning = (typeName.kind === 71 ? 67901928 : 1920) | 2097152;
-            var rootSymbol = resolveName(rootName, rootName.escapedText, meaning, undefined, undefined, true);
+            var meaning = (typeName.kind === 71 /* Identifier */ ? 67901928 /* Type */ : 1920 /* Namespace */) | 2097152 /* Alias */;
+            var rootSymbol = resolveName(rootName, rootName.escapedText, meaning, /*nameNotFoundMessage*/ undefined, /*nameArg*/ undefined, /*isRefernce*/ true);
             if (rootSymbol
-                && rootSymbol.flags & 2097152
+                && rootSymbol.flags & 2097152 /* Alias */
                 && symbolIsValue(rootSymbol)
                 && !isConstEnumOrConstEnumOnlyModule(resolveAlias(rootSymbol))) {
                 markAliasSymbolAsReferenced(rootSymbol);
             }
         }
+        /**
+         * This function marks the type used for metadata decorator as referenced if it is import
+         * from external module.
+         * This is different from markTypeNodeAsReferenced because it tries to simplify type nodes in
+         * union and intersection type
+         * @param node
+         */
         function markDecoratorMedataDataTypeNodeAsReferenced(node) {
             var entityName = getEntityNameForDecoratorMetadata(node);
             if (entityName && ts.isEntityName(entityName)) {
@@ -38924,25 +49492,32 @@ var ts;
         function getEntityNameForDecoratorMetadata(node) {
             if (node) {
                 switch (node.kind) {
-                    case 170:
-                    case 169:
+                    case 170 /* IntersectionType */:
+                    case 169 /* UnionType */:
                         var commonEntityName = void 0;
                         for (var _i = 0, _a = node.types; _i < _a.length; _i++) {
                             var typeNode = _a[_i];
-                            while (typeNode.kind === 173) {
-                                typeNode = typeNode.type;
+                            while (typeNode.kind === 173 /* ParenthesizedType */) {
+                                typeNode = typeNode.type; // Skip parens if need be
                             }
-                            if (typeNode.kind === 131) {
-                                continue;
+                            if (typeNode.kind === 131 /* NeverKeyword */) {
+                                continue; // Always elide `never` from the union/intersection if possible
                             }
-                            if (!strictNullChecks && (typeNode.kind === 95 || typeNode.kind === 140)) {
-                                continue;
+                            if (!strictNullChecks && (typeNode.kind === 95 /* NullKeyword */ || typeNode.kind === 140 /* UndefinedKeyword */)) {
+                                continue; // Elide null and undefined from unions for metadata, just like what we did prior to the implementation of strict null checks
                             }
                             var individualEntityName = getEntityNameForDecoratorMetadata(typeNode);
                             if (!individualEntityName) {
+                                // Individual is something like string number
+                                // So it would be serialized to either that type or object
+                                // Safe to return here
                                 return undefined;
                             }
                             if (commonEntityName) {
+                                // Note this is in sync with the transformation that happens for type node.
+                                // Keep this in sync with serializeUnionOrIntersectionType
+                                // Verify if they refer to same entity and is identifier
+                                // return undefined if they dont match because we would emit object
                                 if (!ts.isIdentifier(commonEntityName) ||
                                     !ts.isIdentifier(individualEntityName) ||
                                     commonEntityName.escapedText !== individualEntityName.escapedText) {
@@ -38954,9 +49529,9 @@ var ts;
                             }
                         }
                         return commonEntityName;
-                    case 173:
+                    case 173 /* ParenthesizedType */:
                         return getEntityNameForDecoratorMetadata(node.type);
-                    case 162:
+                    case 162 /* TypeReference */:
                         return node.typeName;
                 }
             }
@@ -38965,10 +49540,13 @@ var ts;
             var typeNode = ts.getEffectiveTypeAnnotationNode(node);
             return ts.isRestParameter(node) ? ts.getRestParameterElementType(typeNode) : typeNode;
         }
+        /** Check the decorators of a node */
         function checkDecorators(node) {
             if (!node.decorators) {
                 return;
             }
+            // skip this check for nodes that cannot have decorators. These should have already had an error reported by
+            // checkGrammarDecorators.
             if (!ts.nodeCanBeDecorated(node, node.parent, node.parent.parent)) {
                 return;
             }
@@ -38976,14 +49554,15 @@ var ts;
                 error(node, ts.Diagnostics.Experimental_support_for_decorators_is_a_feature_that_is_subject_to_change_in_a_future_release_Set_the_experimentalDecorators_option_to_remove_this_warning);
             }
             var firstDecorator = node.decorators[0];
-            checkExternalEmitHelpers(firstDecorator, 8);
-            if (node.kind === 149) {
-                checkExternalEmitHelpers(firstDecorator, 32);
+            checkExternalEmitHelpers(firstDecorator, 8 /* Decorate */);
+            if (node.kind === 149 /* Parameter */) {
+                checkExternalEmitHelpers(firstDecorator, 32 /* Param */);
             }
             if (compilerOptions.emitDecoratorMetadata) {
-                checkExternalEmitHelpers(firstDecorator, 16);
+                checkExternalEmitHelpers(firstDecorator, 16 /* Metadata */);
+                // we only need to perform these checks if we are emitting serialized type metadata for the target of a decorator.
                 switch (node.kind) {
-                    case 235:
+                    case 235 /* ClassDeclaration */:
                         var constructor = ts.getFirstConstructorWithBody(node);
                         if (constructor) {
                             for (var _i = 0, _a = constructor.parameters; _i < _a.length; _i++) {
@@ -38992,19 +49571,19 @@ var ts;
                             }
                         }
                         break;
-                    case 154:
-                    case 156:
-                    case 157:
+                    case 154 /* MethodDeclaration */:
+                    case 156 /* GetAccessor */:
+                    case 157 /* SetAccessor */:
                         for (var _b = 0, _c = node.parameters; _b < _c.length; _b++) {
                             var parameter = _c[_b];
                             markDecoratorMedataDataTypeNodeAsReferenced(getParameterTypeNodeForDecoratorCheck(parameter));
                         }
                         markDecoratorMedataDataTypeNodeAsReferenced(ts.getEffectiveReturnTypeNode(node));
                         break;
-                    case 152:
+                    case 152 /* PropertyDeclaration */:
                         markDecoratorMedataDataTypeNodeAsReferenced(ts.getEffectiveTypeAnnotationNode(node));
                         break;
-                    case 149:
+                    case 149 /* Parameter */:
                         markDecoratorMedataDataTypeNodeAsReferenced(getParameterTypeNodeForDecoratorCheck(node));
                         var containingSignature = node.parent;
                         for (var _d = 0, _e = containingSignature.parameters; _d < _e.length; _d++) {
@@ -39026,6 +49605,7 @@ var ts;
         }
         function checkJSDocTypeAliasTag(node) {
             if (!node.typeExpression) {
+                // If the node had `@property` tags, `typeExpression` would have been set to the first property tag.
                 error(node.name, ts.Diagnostics.JSDoc_typedef_tag_should_either_have_a_type_annotation_or_be_followed_by_property_or_member_tags);
             }
             if (node.name) {
@@ -39037,18 +49617,21 @@ var ts;
             checkSourceElement(node.typeExpression);
             if (!ts.getParameterSymbolFromJSDoc(node)) {
                 var decl = ts.getHostSignatureFromJSDoc(node);
+                // don't issue an error for invalid hosts -- just functions --
+                // and give a better error message when the host function mentions `arguments`
+                // but the tag doesn't have an array type
                 if (decl) {
                     var i = ts.getJSDocTags(decl).filter(ts.isJSDocParameterTag).indexOf(node);
                     if (i > -1 && i < decl.parameters.length && ts.isBindingPattern(decl.parameters[i].name)) {
                         return;
                     }
                     if (!containsArgumentsReference(decl)) {
-                        error(node.name, ts.Diagnostics.JSDoc_param_tag_has_name_0_but_there_is_no_parameter_with_that_name, ts.idText(node.name.kind === 146 ? node.name.right : node.name));
+                        error(node.name, ts.Diagnostics.JSDoc_param_tag_has_name_0_but_there_is_no_parameter_with_that_name, ts.idText(node.name.kind === 146 /* QualifiedName */ ? node.name.right : node.name));
                     }
                     else if (ts.findLast(ts.getJSDocTags(decl), ts.isJSDocParameterTag) === node &&
                         node.typeExpression && node.typeExpression.type &&
                         !isArrayType(getTypeFromTypeNode(node.typeExpression.type))) {
-                        error(node.name, ts.Diagnostics.JSDoc_param_tag_has_name_0_but_there_is_no_parameter_with_that_name_It_would_match_arguments_if_it_had_an_array_type, ts.idText(node.name.kind === 146 ? node.name.right : node.name));
+                        error(node.name, ts.Diagnostics.JSDoc_param_tag_has_name_0_but_there_is_no_parameter_with_that_name_It_would_match_arguments_if_it_had_an_array_type, ts.idText(node.name.kind === 146 /* QualifiedName */ ? node.name.right : node.name));
                     }
                 }
             }
@@ -39075,9 +49658,9 @@ var ts;
         }
         function getIdentifierFromEntityNameExpression(node) {
             switch (node.kind) {
-                case 71:
+                case 71 /* Identifier */:
                     return node;
-                case 185:
+                case 185 /* PropertyAccessExpression */:
                     return node.name;
                 default:
                     return undefined;
@@ -39087,41 +49670,63 @@ var ts;
             checkDecorators(node);
             checkSignatureDeclaration(node);
             var functionFlags = ts.getFunctionFlags(node);
-            if (node.name && node.name.kind === 147) {
+            // Do not use hasDynamicName here, because that returns false for well known symbols.
+            // We want to perform checkComputedPropertyName for all computed properties, including
+            // well known symbols.
+            if (node.name && node.name.kind === 147 /* ComputedPropertyName */) {
+                // This check will account for methods in class/interface declarations,
+                // as well as accessors in classes/object literals
                 checkComputedPropertyName(node.name);
             }
             if (!hasNonBindableDynamicName(node)) {
+                // first we want to check the local symbol that contain this declaration
+                // - if node.localSymbol !== undefined - this is current declaration is exported and localSymbol points to the local symbol
+                // - if node.localSymbol === undefined - this node is non-exported so we can just pick the result of getSymbolOfNode
                 var symbol = getSymbolOfNode(node);
                 var localSymbol = node.localSymbol || symbol;
-                var firstDeclaration = ts.find(localSymbol.declarations, function (declaration) { return declaration.kind === node.kind && !(declaration.flags & 65536); });
+                // Since the javascript won't do semantic analysis like typescript,
+                // if the javascript file comes before the typescript file and both contain same name functions,
+                // checkFunctionOrConstructorSymbol wouldn't be called if we didnt ignore javascript function.
+                var firstDeclaration = ts.find(localSymbol.declarations, 
+                // Get first non javascript function declaration
+                function (declaration) { return declaration.kind === node.kind && !(declaration.flags & 65536 /* JavaScriptFile */); });
+                // Only type check the symbol once
                 if (node === firstDeclaration) {
                     checkFunctionOrConstructorSymbol(localSymbol);
                 }
                 if (symbol.parent) {
+                    // run check once for the first declaration
                     if (ts.getDeclarationOfKind(symbol, node.kind) === node) {
+                        // run check on export symbol to check that modifiers agree across all exported declarations
                         checkFunctionOrConstructorSymbol(symbol);
                     }
                 }
             }
-            var body = node.kind === 153 ? undefined : node.body;
+            var body = node.kind === 153 /* MethodSignature */ ? undefined : node.body;
             checkSourceElement(body);
             var returnTypeNode = ts.getEffectiveReturnTypeNode(node);
-            if ((functionFlags & 1) === 0) {
-                var returnOrPromisedType = returnTypeNode && (functionFlags & 2
-                    ? checkAsyncFunctionReturnType(node)
-                    : getTypeFromTypeNode(returnTypeNode));
+            if ((functionFlags & 1 /* Generator */) === 0) { // Async function or normal function
+                var returnOrPromisedType = returnTypeNode && (functionFlags & 2 /* Async */
+                    ? checkAsyncFunctionReturnType(node) // Async function
+                    : getTypeFromTypeNode(returnTypeNode)); // normal function
                 checkAllCodePathsInNonVoidFunctionReturnOrThrow(node, returnOrPromisedType);
             }
             if (produceDiagnostics && !returnTypeNode) {
+                // Report an implicit any error if there is no body, no explicit return type, and node is not a private method
+                // in an ambient context
                 if (noImplicitAny && ts.nodeIsMissing(body) && !isPrivateWithinAmbient(node)) {
                     reportImplicitAnyError(node, anyType);
                 }
-                if (functionFlags & 1 && ts.nodeIsPresent(body)) {
+                if (functionFlags & 1 /* Generator */ && ts.nodeIsPresent(body)) {
+                    // A generator with a body and no type annotation can still cause errors. It can error if the
+                    // yielded values have no common supertype, or it can give an implicit any error if it has no
+                    // yielded values. The only way to trigger these errors is to try checking its return type.
                     getReturnTypeOfSignature(getSignatureFromDeclaration(node));
                 }
             }
         }
         function registerForUnusedIdentifiersCheck(node) {
+            // May be in a call such as getTypeOfNode that happened to call this. But potentiallyUnusedIdentifiers is only defined in the scope of `checkSourceFile`.
             if (produceDiagnostics) {
                 var sourceFile = ts.getSourceFileOfNode(node);
                 var potentiallyUnusedIdentifiers = allPotentiallyUnusedIdentifiers.get(sourceFile.path);
@@ -39129,6 +49734,8 @@ var ts;
                     potentiallyUnusedIdentifiers = [];
                     allPotentiallyUnusedIdentifiers.set(sourceFile.path, potentiallyUnusedIdentifiers);
                 }
+                // TODO: GH#22580
+                // Debug.assert(addToSeen(seenPotentiallyUnusedIdentifiers, getNodeId(node)), "Adding potentially-unused identifier twice");
                 potentiallyUnusedIdentifiers.push(node);
             }
         }
@@ -39136,41 +49743,41 @@ var ts;
             for (var _i = 0, potentiallyUnusedIdentifiers_1 = potentiallyUnusedIdentifiers; _i < potentiallyUnusedIdentifiers_1.length; _i++) {
                 var node = potentiallyUnusedIdentifiers_1[_i];
                 switch (node.kind) {
-                    case 235:
-                    case 205:
+                    case 235 /* ClassDeclaration */:
+                    case 205 /* ClassExpression */:
                         checkUnusedClassMembers(node, addDiagnostic);
                         checkUnusedTypeParameters(node, addDiagnostic);
                         break;
-                    case 236:
+                    case 236 /* InterfaceDeclaration */:
                         checkUnusedTypeParameters(node, addDiagnostic);
                         break;
-                    case 274:
-                    case 239:
-                    case 213:
-                    case 241:
-                    case 220:
-                    case 221:
-                    case 222:
+                    case 274 /* SourceFile */:
+                    case 239 /* ModuleDeclaration */:
+                    case 213 /* Block */:
+                    case 241 /* CaseBlock */:
+                    case 220 /* ForStatement */:
+                    case 221 /* ForInStatement */:
+                    case 222 /* ForOfStatement */:
                         checkUnusedLocalsAndParameters(node, addDiagnostic);
                         break;
-                    case 155:
-                    case 192:
-                    case 234:
-                    case 193:
-                    case 154:
-                    case 156:
-                    case 157:
+                    case 155 /* Constructor */:
+                    case 192 /* FunctionExpression */:
+                    case 234 /* FunctionDeclaration */:
+                    case 193 /* ArrowFunction */:
+                    case 154 /* MethodDeclaration */:
+                    case 156 /* GetAccessor */:
+                    case 157 /* SetAccessor */:
                         if (node.body) {
                             checkUnusedLocalsAndParameters(node, addDiagnostic);
                         }
                         checkUnusedTypeParameters(node, addDiagnostic);
                         break;
-                    case 153:
-                    case 158:
-                    case 159:
-                    case 163:
-                    case 164:
-                    case 237:
+                    case 153 /* MethodSignature */:
+                    case 158 /* CallSignature */:
+                    case 159 /* ConstructSignature */:
+                    case 163 /* FunctionType */:
+                    case 164 /* ConstructorType */:
+                    case 237 /* TypeAliasDeclaration */:
                         checkUnusedTypeParameters(node, addDiagnostic);
                         break;
                     default:
@@ -39181,41 +49788,43 @@ var ts;
         function errorUnusedLocal(declaration, name, addDiagnostic) {
             var node = ts.getNameOfDeclaration(declaration) || declaration;
             var message = isTypeDeclaration(declaration) ? ts.Diagnostics._0_is_declared_but_never_used : ts.Diagnostics._0_is_declared_but_its_value_is_never_read;
-            addDiagnostic(0, ts.createDiagnosticForNode(node, message, name));
+            addDiagnostic(0 /* Local */, ts.createDiagnosticForNode(node, message, name));
         }
         function parameterNameStartsWithUnderscore(parameterName) {
             return parameterName && isIdentifierThatStartsWithUnderScore(parameterName);
         }
         function isIdentifierThatStartsWithUnderScore(node) {
-            return ts.isIdentifier(node) && ts.idText(node).charCodeAt(0) === 95;
+            return ts.isIdentifier(node) && ts.idText(node).charCodeAt(0) === 95 /* _ */;
         }
         function checkUnusedClassMembers(node, addDiagnostic) {
-            if (!(node.flags & 4194304)) {
+            if (!(node.flags & 4194304 /* Ambient */)) {
                 for (var _i = 0, _a = node.members; _i < _a.length; _i++) {
                     var member = _a[_i];
                     switch (member.kind) {
-                        case 154:
-                        case 152:
-                        case 156:
-                        case 157:
-                            if (member.kind === 157 && member.symbol.flags & 32768) {
+                        case 154 /* MethodDeclaration */:
+                        case 152 /* PropertyDeclaration */:
+                        case 156 /* GetAccessor */:
+                        case 157 /* SetAccessor */:
+                            if (member.kind === 157 /* SetAccessor */ && member.symbol.flags & 32768 /* GetAccessor */) {
+                                // Already would have reported an error on the getter.
                                 break;
                             }
                             var symbol = getSymbolOfNode(member);
-                            if (!symbol.isReferenced && ts.hasModifier(member, 8)) {
-                                addDiagnostic(0, ts.createDiagnosticForNode(member.name, ts.Diagnostics._0_is_declared_but_its_value_is_never_read, symbolToString(symbol)));
+                            if (!symbol.isReferenced && ts.hasModifier(member, 8 /* Private */)) {
+                                addDiagnostic(0 /* Local */, ts.createDiagnosticForNode(member.name, ts.Diagnostics._0_is_declared_but_its_value_is_never_read, symbolToString(symbol)));
                             }
                             break;
-                        case 155:
+                        case 155 /* Constructor */:
                             for (var _b = 0, _c = member.parameters; _b < _c.length; _b++) {
                                 var parameter = _c[_b];
-                                if (!parameter.symbol.isReferenced && ts.hasModifier(parameter, 8)) {
-                                    addDiagnostic(0, ts.createDiagnosticForNode(parameter.name, ts.Diagnostics.Property_0_is_declared_but_its_value_is_never_read, ts.symbolName(parameter.symbol)));
+                                if (!parameter.symbol.isReferenced && ts.hasModifier(parameter, 8 /* Private */)) {
+                                    addDiagnostic(0 /* Local */, ts.createDiagnosticForNode(parameter.name, ts.Diagnostics.Property_0_is_declared_but_its_value_is_never_read, ts.symbolName(parameter.symbol)));
                                 }
                             }
                             break;
-                        case 160:
-                        case 212:
+                        case 160 /* IndexSignature */:
+                        case 212 /* SemicolonClassElement */:
+                            // Can't be private
                             break;
                         default:
                             ts.Debug.fail();
@@ -39224,12 +49833,14 @@ var ts;
             }
         }
         function checkUnusedTypeParameters(node, addDiagnostic) {
+            // Only report errors on the last declaration for the type parameter container;
+            // this ensures that all uses have been accounted for.
             var typeParameters = ts.getEffectiveTypeParameterDeclarations(node);
-            if (!(node.flags & 4194304) && ts.last(getSymbolOfNode(node).declarations) === node) {
+            if (!(node.flags & 4194304 /* Ambient */) && ts.last(getSymbolOfNode(node).declarations) === node) {
                 for (var _i = 0, typeParameters_2 = typeParameters; _i < typeParameters_2.length; _i++) {
                     var typeParameter = typeParameters_2[_i];
-                    if (!(getMergedSymbol(typeParameter.symbol).isReferenced & 262144) && !isIdentifierThatStartsWithUnderScore(typeParameter.name)) {
-                        addDiagnostic(1, ts.createDiagnosticForNode(typeParameter.name, ts.Diagnostics._0_is_declared_but_its_value_is_never_read, ts.symbolName(typeParameter.symbol)));
+                    if (!(getMergedSymbol(typeParameter.symbol).isReferenced & 262144 /* TypeParameter */) && !isIdentifierThatStartsWithUnderScore(typeParameter.name)) {
+                        addDiagnostic(1 /* Parameter */, ts.createDiagnosticForNode(typeParameter.name, ts.Diagnostics._0_is_declared_but_its_value_is_never_read, ts.symbolName(typeParameter.symbol)));
                     }
                 }
             }
@@ -39248,13 +49859,16 @@ var ts;
             return ts.tryCast(ts.getRootDeclaration(node), ts.isParameter);
         }
         function checkUnusedLocalsAndParameters(nodeWithLocals, addDiagnostic) {
-            if (nodeWithLocals.flags & 4194304)
+            if (nodeWithLocals.flags & 4194304 /* Ambient */)
                 return;
+            // Ideally we could use the ImportClause directly as a key, but must wait until we have full ES6 maps. So must store key along with value.
             var unusedImports = ts.createMap();
             var unusedDestructures = ts.createMap();
             var unusedVariables = ts.createMap();
             nodeWithLocals.locals.forEach(function (local) {
-                if (local.flags & 262144 ? !(local.flags & 3 && !(local.isReferenced & 3)) : local.isReferenced || local.exportSymbol) {
+                // If it's purely a type parameter, ignore, will be checked in `checkUnusedTypeParameters`.
+                // If it's a type parameter merged with a parameter, check if the parameter-side is used.
+                if (local.flags & 262144 /* TypeParameter */ ? !(local.flags & 3 /* Variable */ && !(local.isReferenced & 3 /* Variable */)) : local.isReferenced || local.exportSymbol) {
                     return;
                 }
                 for (var _i = 0, _a = local.declarations; _i < _a.length; _i++) {
@@ -39265,6 +49879,7 @@ var ts;
                         addToGroup(unusedImports, importClauseFromImported(declaration), declaration, getNodeId);
                     }
                     else if (ts.isBindingElement(declaration) && ts.isObjectBindingPattern(declaration.parent)) {
+                        // In `{ a, ...b }, `a` is considered used since it removes a property from `b`. `b` may still be unused though.
                         var lastElement = ts.last(declaration.parent.elements);
                         if (declaration === lastElement || !ts.last(declaration.parent.elements).dotDotDotToken) {
                             addToGroup(unusedDestructures, declaration.parent, declaration, getNodeId);
@@ -39280,7 +49895,7 @@ var ts;
                         if (parameter) {
                             var name = ts.getNameOfDeclaration(local.valueDeclaration);
                             if (!ts.isParameterPropertyDeclaration(parameter) && !ts.parameterIsThisKeyword(parameter) && !parameterNameStartsWithUnderscore(name)) {
-                                addDiagnostic(1, ts.createDiagnosticForNode(name, ts.Diagnostics._0_is_declared_but_its_value_is_never_read, ts.symbolName(local)));
+                                addDiagnostic(1 /* Parameter */, ts.createDiagnosticForNode(name, ts.Diagnostics._0_is_declared_but_its_value_is_never_read, ts.symbolName(local)));
                             }
                         }
                         else {
@@ -39294,10 +49909,10 @@ var ts;
                 var importDecl = importClause.parent;
                 var nDeclarations = (importClause.name ? 1 : 0) +
                     (importClause.namedBindings ?
-                        (importClause.namedBindings.kind === 246 ? 1 : importClause.namedBindings.elements.length)
+                        (importClause.namedBindings.kind === 246 /* NamespaceImport */ ? 1 : importClause.namedBindings.elements.length)
                         : 0);
                 if (nDeclarations === unuseds.length) {
-                    addDiagnostic(0, unuseds.length === 1
+                    addDiagnostic(0 /* Local */, unuseds.length === 1
                         ? ts.createDiagnosticForNode(importDecl, ts.Diagnostics._0_is_declared_but_its_value_is_never_read, ts.idText(ts.first(unuseds).name))
                         : ts.createDiagnosticForNode(importDecl, ts.Diagnostics.All_imports_in_import_declaration_are_unused));
                 }
@@ -39310,9 +49925,9 @@ var ts;
             });
             unusedDestructures.forEach(function (_a) {
                 var bindingPattern = _a[0], bindingElements = _a[1];
-                var kind = tryGetRootParameterDeclaration(bindingPattern.parent) ? 1 : 0;
+                var kind = tryGetRootParameterDeclaration(bindingPattern.parent) ? 1 /* Parameter */ : 0 /* Local */;
                 if (bindingPattern.elements.length === bindingElements.length) {
-                    if (bindingElements.length === 1 && bindingPattern.parent.kind === 232 && bindingPattern.parent.parent.kind === 233) {
+                    if (bindingElements.length === 1 && bindingPattern.parent.kind === 232 /* VariableDeclaration */ && bindingPattern.parent.parent.kind === 233 /* VariableDeclarationList */) {
                         addToGroup(unusedVariables, bindingPattern.parent.parent, bindingPattern.parent, getNodeId);
                     }
                     else {
@@ -39331,37 +49946,38 @@ var ts;
             unusedVariables.forEach(function (_a) {
                 var declarationList = _a[0], declarations = _a[1];
                 if (declarationList.declarations.length === declarations.length) {
-                    addDiagnostic(0, declarations.length === 1
+                    addDiagnostic(0 /* Local */, declarations.length === 1
                         ? ts.createDiagnosticForNode(ts.first(declarations).name, ts.Diagnostics._0_is_declared_but_its_value_is_never_read, bindingNameText(ts.first(declarations).name))
-                        : ts.createDiagnosticForNode(declarationList.parent.kind === 214 ? declarationList.parent : declarationList, ts.Diagnostics.All_variables_are_unused));
+                        : ts.createDiagnosticForNode(declarationList.parent.kind === 214 /* VariableStatement */ ? declarationList.parent : declarationList, ts.Diagnostics.All_variables_are_unused));
                 }
                 else {
-                    for (var _i = 0, declarations_5 = declarations; _i < declarations_5.length; _i++) {
-                        var decl = declarations_5[_i];
-                        addDiagnostic(0, ts.createDiagnosticForNode(decl, ts.Diagnostics._0_is_declared_but_its_value_is_never_read, ts.idText(ts.cast(decl.name, ts.isIdentifier))));
+                    for (var _i = 0, declarations_4 = declarations; _i < declarations_4.length; _i++) {
+                        var decl = declarations_4[_i];
+                        addDiagnostic(0 /* Local */, ts.createDiagnosticForNode(decl, ts.Diagnostics._0_is_declared_but_its_value_is_never_read, ts.idText(ts.cast(decl.name, ts.isIdentifier))));
                     }
                 }
             });
         }
         function bindingNameText(name) {
             switch (name.kind) {
-                case 71:
+                case 71 /* Identifier */:
                     return ts.idText(name);
-                case 181:
-                case 180:
+                case 181 /* ArrayBindingPattern */:
+                case 180 /* ObjectBindingPattern */:
                     return bindingNameText(ts.cast(ts.first(name.elements), ts.isBindingElement).name);
                 default:
                     return ts.Debug.assertNever(name);
             }
         }
         function isImportedDeclaration(node) {
-            return node.kind === 245 || node.kind === 248 || node.kind === 246;
+            return node.kind === 245 /* ImportClause */ || node.kind === 248 /* ImportSpecifier */ || node.kind === 246 /* NamespaceImport */;
         }
         function importClauseFromImported(decl) {
-            return decl.kind === 245 ? decl : decl.kind === 246 ? decl.parent : decl.parent.parent;
+            return decl.kind === 245 /* ImportClause */ ? decl : decl.kind === 246 /* NamespaceImport */ ? decl.parent : decl.parent.parent;
         }
         function checkBlock(node) {
-            if (node.kind === 213) {
+            // Grammar checking for SyntaxKind.Block
+            if (node.kind === 213 /* Block */) {
                 checkGrammarStatementInAmbientContext(node);
             }
             if (ts.isFunctionOrModuleBlock(node)) {
@@ -39377,7 +49993,8 @@ var ts;
             }
         }
         function checkCollisionWithArgumentsInGeneratedCode(node) {
-            if (languageVersion >= 2 || compilerOptions.noEmit || !ts.hasRestParameter(node) || node.flags & 4194304 || ts.nodeIsMissing(node.body)) {
+            // no rest parameters \ declaration context \ overload - no codegen impact
+            if (languageVersion >= 2 /* ES2015 */ || compilerOptions.noEmit || !ts.hasRestParameter(node) || node.flags & 4194304 /* Ambient */ || ts.nodeIsMissing(node.body)) {
                 return;
             }
             ts.forEach(node.parameters, function (p) {
@@ -39390,27 +50007,31 @@ var ts;
             if (!(identifier && identifier.escapedText === name)) {
                 return false;
             }
-            if (node.kind === 152 ||
-                node.kind === 151 ||
-                node.kind === 154 ||
-                node.kind === 153 ||
-                node.kind === 156 ||
-                node.kind === 157) {
+            if (node.kind === 152 /* PropertyDeclaration */ ||
+                node.kind === 151 /* PropertySignature */ ||
+                node.kind === 154 /* MethodDeclaration */ ||
+                node.kind === 153 /* MethodSignature */ ||
+                node.kind === 156 /* GetAccessor */ ||
+                node.kind === 157 /* SetAccessor */) {
+                // it is ok to have member named '_super' or '_this' - member access is always qualified
                 return false;
             }
-            if (node.flags & 4194304) {
+            if (node.flags & 4194304 /* Ambient */) {
+                // ambient context - no codegen impact
                 return false;
             }
             var root = ts.getRootDeclaration(node);
-            if (root.kind === 149 && ts.nodeIsMissing(root.parent.body)) {
+            if (root.kind === 149 /* Parameter */ && ts.nodeIsMissing(root.parent.body)) {
+                // just an overload - no codegen impact
                 return false;
             }
             return true;
         }
+        // this function will run after checking the source file so 'CaptureThis' is correct for all nodes
         function checkIfThisIsCapturedInEnclosingScope(node) {
             ts.findAncestor(node, function (current) {
-                if (getNodeCheckFlags(current) & 4) {
-                    var isDeclaration_1 = node.kind !== 71;
+                if (getNodeCheckFlags(current) & 4 /* CaptureThis */) {
+                    var isDeclaration_1 = node.kind !== 71 /* Identifier */;
                     if (isDeclaration_1) {
                         error(ts.getNameOfDeclaration(node), ts.Diagnostics.Duplicate_identifier_this_Compiler_uses_variable_declaration_this_to_capture_this_reference);
                     }
@@ -39424,8 +50045,8 @@ var ts;
         }
         function checkIfNewTargetIsCapturedInEnclosingScope(node) {
             ts.findAncestor(node, function (current) {
-                if (getNodeCheckFlags(current) & 8) {
-                    var isDeclaration_2 = node.kind !== 71;
+                if (getNodeCheckFlags(current) & 8 /* CaptureNewTarget */) {
+                    var isDeclaration_2 = node.kind !== 71 /* Identifier */;
                     if (isDeclaration_2) {
                         error(ts.getNameOfDeclaration(node), ts.Diagnostics.Duplicate_identifier_newTarget_Compiler_uses_variable_declaration_newTarget_to_capture_new_target_meta_property_reference);
                     }
@@ -39438,57 +50059,96 @@ var ts;
             });
         }
         function checkCollisionWithRequireExportsInGeneratedCode(node, name) {
+            // No need to check for require or exports for ES6 modules and later
             if (moduleKind >= ts.ModuleKind.ES2015 || compilerOptions.noEmit) {
                 return;
             }
             if (!needCollisionCheckForIdentifier(node, name, "require") && !needCollisionCheckForIdentifier(node, name, "exports")) {
                 return;
             }
-            if (ts.isModuleDeclaration(node) && ts.getModuleInstanceState(node) !== 1) {
+            // Uninstantiated modules shouldnt do this check
+            if (ts.isModuleDeclaration(node) && ts.getModuleInstanceState(node) !== 1 /* Instantiated */) {
                 return;
             }
+            // In case of variable declaration, node.parent is variable statement so look at the variable statement's parent
             var parent = getDeclarationContainer(node);
-            if (parent.kind === 274 && ts.isExternalOrCommonJsModule(parent)) {
+            if (parent.kind === 274 /* SourceFile */ && ts.isExternalOrCommonJsModule(parent)) {
+                // If the declaration happens to be in external module, report error that require and exports are reserved keywords
                 error(name, ts.Diagnostics.Duplicate_identifier_0_Compiler_reserves_name_1_in_top_level_scope_of_a_module, ts.declarationNameToString(name), ts.declarationNameToString(name));
             }
         }
         function checkCollisionWithGlobalPromiseInGeneratedCode(node, name) {
-            if (languageVersion >= 4 || compilerOptions.noEmit || !needCollisionCheckForIdentifier(node, name, "Promise")) {
+            if (languageVersion >= 4 /* ES2017 */ || compilerOptions.noEmit || !needCollisionCheckForIdentifier(node, name, "Promise")) {
                 return;
             }
-            if (ts.isModuleDeclaration(node) && ts.getModuleInstanceState(node) !== 1) {
+            // Uninstantiated modules shouldnt do this check
+            if (ts.isModuleDeclaration(node) && ts.getModuleInstanceState(node) !== 1 /* Instantiated */) {
                 return;
             }
+            // In case of variable declaration, node.parent is variable statement so look at the variable statement's parent
             var parent = getDeclarationContainer(node);
-            if (parent.kind === 274 && ts.isExternalOrCommonJsModule(parent) && parent.flags & 1024) {
+            if (parent.kind === 274 /* SourceFile */ && ts.isExternalOrCommonJsModule(parent) && parent.flags & 1024 /* HasAsyncFunctions */) {
+                // If the declaration happens to be in external module, report error that Promise is a reserved identifier.
                 error(name, ts.Diagnostics.Duplicate_identifier_0_Compiler_reserves_name_1_in_top_level_scope_of_a_module_containing_async_functions, ts.declarationNameToString(name), ts.declarationNameToString(name));
             }
         }
         function checkVarDeclaredNamesNotShadowed(node) {
-            if ((ts.getCombinedNodeFlags(node) & 3) !== 0 || ts.isParameterDeclaration(node)) {
+            // - ScriptBody : StatementList
+            // It is a Syntax Error if any element of the LexicallyDeclaredNames of StatementList
+            // also occurs in the VarDeclaredNames of StatementList.
+            // - Block : { StatementList }
+            // It is a Syntax Error if any element of the LexicallyDeclaredNames of StatementList
+            // also occurs in the VarDeclaredNames of StatementList.
+            // Variable declarations are hoisted to the top of their function scope. They can shadow
+            // block scoped declarations, which bind tighter. this will not be flagged as duplicate definition
+            // by the binder as the declaration scope is different.
+            // A non-initialized declaration is a no-op as the block declaration will resolve before the var
+            // declaration. the problem is if the declaration has an initializer. this will act as a write to the
+            // block declared value. this is fine for let, but not const.
+            // Only consider declarations with initializers, uninitialized const declarations will not
+            // step on a let/const variable.
+            // Do not consider const and const declarations, as duplicate block-scoped declarations
+            // are handled by the binder.
+            // We are only looking for const declarations that step on let\const declarations from a
+            // different scope. e.g.:
+            //      {
+            //          const x = 0; // localDeclarationSymbol obtained after name resolution will correspond to this declaration
+            //          const x = 0; // symbol for this declaration will be 'symbol'
+            //      }
+            // skip block-scoped variables and parameters
+            if ((ts.getCombinedNodeFlags(node) & 3 /* BlockScoped */) !== 0 || ts.isParameterDeclaration(node)) {
                 return;
             }
-            if (node.kind === 232 && !node.initializer) {
+            // skip variable declarations that don't have initializers
+            // NOTE: in ES6 spec initializer is required in variable declarations where name is binding pattern
+            // so we'll always treat binding elements as initialized
+            if (node.kind === 232 /* VariableDeclaration */ && !node.initializer) {
                 return;
             }
             var symbol = getSymbolOfNode(node);
-            if (symbol.flags & 1) {
+            if (symbol.flags & 1 /* FunctionScopedVariable */) {
                 if (!ts.isIdentifier(node.name))
                     return ts.Debug.fail();
-                var localDeclarationSymbol = resolveName(node, node.name.escapedText, 3, undefined, undefined, false);
+                var localDeclarationSymbol = resolveName(node, node.name.escapedText, 3 /* Variable */, /*nodeNotFoundErrorMessage*/ undefined, /*nameArg*/ undefined, /*isUse*/ false);
                 if (localDeclarationSymbol &&
                     localDeclarationSymbol !== symbol &&
-                    localDeclarationSymbol.flags & 2) {
-                    if (getDeclarationNodeFlagsFromSymbol(localDeclarationSymbol) & 3) {
-                        var varDeclList = ts.getAncestor(localDeclarationSymbol.valueDeclaration, 233);
-                        var container = varDeclList.parent.kind === 214 && varDeclList.parent.parent
+                    localDeclarationSymbol.flags & 2 /* BlockScopedVariable */) {
+                    if (getDeclarationNodeFlagsFromSymbol(localDeclarationSymbol) & 3 /* BlockScoped */) {
+                        var varDeclList = ts.getAncestor(localDeclarationSymbol.valueDeclaration, 233 /* VariableDeclarationList */);
+                        var container = varDeclList.parent.kind === 214 /* VariableStatement */ && varDeclList.parent.parent
                             ? varDeclList.parent.parent
                             : undefined;
+                        // names of block-scoped and function scoped variables can collide only
+                        // if block scoped variable is defined in the function\module\source file scope (because of variable hoisting)
                         var namesShareScope = container &&
-                            (container.kind === 213 && ts.isFunctionLike(container.parent) ||
-                                container.kind === 240 ||
-                                container.kind === 239 ||
-                                container.kind === 274);
+                            (container.kind === 213 /* Block */ && ts.isFunctionLike(container.parent) ||
+                                container.kind === 240 /* ModuleBlock */ ||
+                                container.kind === 239 /* ModuleDeclaration */ ||
+                                container.kind === 274 /* SourceFile */);
+                        // here we know that function scoped variable is shadowed by block scoped one
+                        // if they are defined in the same scope - binder has already reported redeclaration error
+                        // otherwise if variable has an initializer - show error that initialization will fail
+                        // since LHS will be block scoped name instead of function scoped
                         if (!namesShareScope) {
                             var name = symbolToString(localDeclarationSymbol);
                             error(node, ts.Diagnostics.Cannot_initialize_outer_scoped_variable_0_in_the_same_scope_as_block_scoped_declaration_1, name, name);
@@ -39497,21 +50157,27 @@ var ts;
                 }
             }
         }
+        // Check that a parameter initializer contains no references to parameters declared to the right of itself
         function checkParameterInitializer(node) {
-            if (ts.getRootDeclaration(node).kind !== 149) {
+            if (ts.getRootDeclaration(node).kind !== 149 /* Parameter */) {
                 return;
             }
             var func = ts.getContainingFunction(node);
             visit(node.initializer);
             function visit(n) {
                 if (ts.isTypeNode(n) || ts.isDeclarationName(n)) {
+                    // do not dive in types
+                    // skip declaration names (i.e. in object literal expressions)
                     return;
                 }
-                if (n.kind === 185) {
+                if (n.kind === 185 /* PropertyAccessExpression */) {
+                    // skip property names in property access expression
                     return visit(n.expression);
                 }
-                else if (n.kind === 71) {
-                    var symbol = resolveName(n, n.escapedText, 67216319 | 2097152, undefined, undefined, false);
+                else if (n.kind === 71 /* Identifier */) {
+                    // check FunctionLikeDeclaration.locals (stores parameters\function local variable)
+                    // if it contains entry with a specified name
+                    var symbol = resolveName(n, n.escapedText, 67216319 /* Value */ | 2097152 /* Alias */, /*nameNotFoundMessage*/ undefined, /*nameArg*/ undefined, /*isUse*/ false);
                     if (!symbol || symbol === unknownSymbol || !symbol.valueDeclaration) {
                         return;
                     }
@@ -39519,24 +50185,32 @@ var ts;
                         error(n, ts.Diagnostics.Parameter_0_cannot_be_referenced_in_its_initializer, ts.declarationNameToString(node.name));
                         return;
                     }
+                    // locals map for function contain both parameters and function locals
+                    // so we need to do a bit of extra work to check if reference is legal
                     var enclosingContainer = ts.getEnclosingBlockScopeContainer(symbol.valueDeclaration);
                     if (enclosingContainer === func) {
-                        if (symbol.valueDeclaration.kind === 149 ||
-                            symbol.valueDeclaration.kind === 182) {
+                        if (symbol.valueDeclaration.kind === 149 /* Parameter */ ||
+                            symbol.valueDeclaration.kind === 182 /* BindingElement */) {
+                            // it is ok to reference parameter in initializer if either
+                            // - parameter is located strictly on the left of current parameter declaration
                             if (symbol.valueDeclaration.pos < node.pos) {
                                 return;
                             }
+                            // - parameter is wrapped in function-like entity
                             if (ts.findAncestor(n, function (current) {
                                 if (current === node.initializer) {
                                     return "quit";
                                 }
                                 return ts.isFunctionLike(current.parent) ||
-                                    (current.parent.kind === 152 &&
-                                        !(ts.hasModifier(current.parent, 32)) &&
+                                    // computed property names/initializers in instance property declaration of class like entities
+                                    // are executed in constructor and thus deferred
+                                    (current.parent.kind === 152 /* PropertyDeclaration */ &&
+                                        !(ts.hasModifier(current.parent, 32 /* Static */)) &&
                                         ts.isClassLike(current.parent.parent));
                             })) {
                                 return;
                             }
+                            // fall through to report error
                         }
                         error(n, ts.Diagnostics.Initializer_of_parameter_0_cannot_reference_identifier_1_declared_after_it, ts.declarationNameToString(node.name), ts.declarationNameToString(n));
                     }
@@ -39549,56 +50223,68 @@ var ts;
         function convertAutoToAny(type) {
             return type === autoType ? anyType : type === autoArrayType ? anyArrayType : type;
         }
+        // Check variable, parameter, or property declaration
         function checkVariableLikeDeclaration(node) {
             checkDecorators(node);
             if (!ts.isBindingElement(node)) {
                 checkSourceElement(node.type);
             }
+            // JSDoc `function(string, string): string` syntax results in parameters with no name
             if (!node.name) {
                 return;
             }
-            if (node.name.kind === 147) {
+            // For a computed property, just check the initializer and exit
+            // Do not use hasDynamicName here, because that returns false for well known symbols.
+            // We want to perform checkComputedPropertyName for all computed properties, including
+            // well known symbols.
+            if (node.name.kind === 147 /* ComputedPropertyName */) {
                 checkComputedPropertyName(node.name);
                 if (node.initializer) {
                     checkExpressionCached(node.initializer);
                 }
             }
-            if (node.kind === 182) {
-                if (node.parent.kind === 180 && languageVersion < 6) {
-                    checkExternalEmitHelpers(node, 4);
+            if (node.kind === 182 /* BindingElement */) {
+                if (node.parent.kind === 180 /* ObjectBindingPattern */ && languageVersion < 6 /* ESNext */) {
+                    checkExternalEmitHelpers(node, 4 /* Rest */);
                 }
-                if (node.propertyName && node.propertyName.kind === 147) {
+                // check computed properties inside property names of binding elements
+                if (node.propertyName && node.propertyName.kind === 147 /* ComputedPropertyName */) {
                     checkComputedPropertyName(node.propertyName);
                 }
+                // check private/protected variable access
                 var parent = node.parent.parent;
                 var parentType = getTypeForBindingElementParent(parent);
                 var name = node.propertyName || node.name;
                 if (!ts.isBindingPattern(name)) {
-                    var property = getPropertyOfType(parentType, ts.getTextOfPropertyName(name));
-                    markPropertyAsReferenced(property, undefined, false);
+                    var property = getPropertyOfType(parentType, ts.getTextOfPropertyName(name)); // TODO: GH#18217
+                    markPropertyAsReferenced(property, /*nodeForCheckWriteOnly*/ undefined, /*isThisAccess*/ false); // A destructuring is never a write-only reference.
                     if (parent.initializer && property) {
                         checkPropertyAccessibility(parent, parent.initializer, parentType, property);
                     }
                 }
             }
+            // For a binding pattern, check contained binding elements
             if (ts.isBindingPattern(node.name)) {
-                if (node.name.kind === 181 && languageVersion < 2 && compilerOptions.downlevelIteration) {
-                    checkExternalEmitHelpers(node, 512);
+                if (node.name.kind === 181 /* ArrayBindingPattern */ && languageVersion < 2 /* ES2015 */ && compilerOptions.downlevelIteration) {
+                    checkExternalEmitHelpers(node, 512 /* Read */);
                 }
                 ts.forEach(node.name.elements, checkSourceElement);
             }
-            if (node.initializer && ts.getRootDeclaration(node).kind === 149 && ts.nodeIsMissing(ts.getContainingFunction(node).body)) {
+            // For a parameter declaration with an initializer, error and exit if the containing function doesn't have a body
+            if (node.initializer && ts.getRootDeclaration(node).kind === 149 /* Parameter */ && ts.nodeIsMissing(ts.getContainingFunction(node).body)) {
                 error(node, ts.Diagnostics.A_parameter_initializer_is_only_allowed_in_a_function_or_constructor_implementation);
                 return;
             }
+            // For a binding pattern, validate the initializer and exit
             if (ts.isBindingPattern(node.name)) {
-                if (node.initializer && node.parent.parent.kind !== 221) {
+                // Don't validate for-in initializer as it is already an error
+                if (node.initializer && node.parent.parent.kind !== 221 /* ForInStatement */) {
                     var initializerType = checkExpressionCached(node.initializer);
                     if (strictNullChecks && node.name.elements.length === 0) {
                         checkNonNullType(initializerType, node);
                     }
                     else {
-                        checkTypeAssignableTo(initializerType, getWidenedTypeForVariableLikeDeclaration(node), node, undefined);
+                        checkTypeAssignableTo(initializerType, getWidenedTypeForVariableLikeDeclaration(node), node, /*headMessage*/ undefined);
                     }
                     checkParameterInitializer(node);
                 }
@@ -39607,30 +50293,35 @@ var ts;
             var symbol = getSymbolOfNode(node);
             var type = convertAutoToAny(getTypeOfSymbol(symbol));
             if (node === symbol.valueDeclaration) {
+                // Node is the primary declaration of the symbol, just validate the initializer
+                // Don't validate for-in initializer as it is already an error
                 var initializer = ts.getEffectiveInitializer(node);
-                if (initializer && node.parent.parent.kind !== 221) {
-                    checkTypeAssignableTo(checkExpressionCached(initializer), type, node, undefined);
+                if (initializer && node.parent.parent.kind !== 221 /* ForInStatement */) {
+                    checkTypeAssignableTo(checkExpressionCached(initializer), type, node, /*headMessage*/ undefined);
                     checkParameterInitializer(node);
                 }
             }
             else {
+                // Node is a secondary declaration, check that type is identical to primary declaration and check that
+                // initializer is consistent with type associated with the node
                 var declarationType = convertAutoToAny(getWidenedTypeForVariableLikeDeclaration(node));
                 if (type !== errorType && declarationType !== errorType &&
                     !isTypeIdenticalTo(type, declarationType) &&
-                    !(symbol.flags & 67108864)) {
+                    !(symbol.flags & 67108864 /* JSContainer */)) {
                     errorNextVariableOrPropertyDeclarationMustHaveSameType(type, node, declarationType);
                 }
                 if (node.initializer) {
-                    checkTypeAssignableTo(checkExpressionCached(node.initializer), declarationType, node, undefined);
+                    checkTypeAssignableTo(checkExpressionCached(node.initializer), declarationType, node, /*headMessage*/ undefined);
                 }
                 if (!areDeclarationFlagsIdentical(node, symbol.valueDeclaration)) {
                     error(ts.getNameOfDeclaration(symbol.valueDeclaration), ts.Diagnostics.All_declarations_of_0_must_have_identical_modifiers, ts.declarationNameToString(node.name));
                     error(node.name, ts.Diagnostics.All_declarations_of_0_must_have_identical_modifiers, ts.declarationNameToString(node.name));
                 }
             }
-            if (node.kind !== 152 && node.kind !== 151) {
+            if (node.kind !== 152 /* PropertyDeclaration */ && node.kind !== 151 /* PropertySignature */) {
+                // We know we don't have a binding pattern or computed name here
                 checkExportsOnMergedDeclarations(node);
-                if (node.kind === 232 || node.kind === 182) {
+                if (node.kind === 232 /* VariableDeclaration */ || node.kind === 182 /* BindingElement */) {
                     checkVarDeclaredNamesNotShadowed(node);
                 }
                 checkCollisionWithRequireExportsInGeneratedCode(node, node.name);
@@ -39639,25 +50330,26 @@ var ts;
         }
         function errorNextVariableOrPropertyDeclarationMustHaveSameType(firstType, nextDeclaration, nextType) {
             var nextDeclarationName = ts.getNameOfDeclaration(nextDeclaration);
-            var message = nextDeclaration.kind === 152 || nextDeclaration.kind === 151
+            var message = nextDeclaration.kind === 152 /* PropertyDeclaration */ || nextDeclaration.kind === 151 /* PropertySignature */
                 ? ts.Diagnostics.Subsequent_property_declarations_must_have_the_same_type_Property_0_must_be_of_type_1_but_here_has_type_2
                 : ts.Diagnostics.Subsequent_variable_declarations_must_have_the_same_type_Variable_0_must_be_of_type_1_but_here_has_type_2;
             error(nextDeclarationName, message, ts.declarationNameToString(nextDeclarationName), typeToString(firstType), typeToString(nextType));
         }
         function areDeclarationFlagsIdentical(left, right) {
-            if ((left.kind === 149 && right.kind === 232) ||
-                (left.kind === 232 && right.kind === 149)) {
+            if ((left.kind === 149 /* Parameter */ && right.kind === 232 /* VariableDeclaration */) ||
+                (left.kind === 232 /* VariableDeclaration */ && right.kind === 149 /* Parameter */)) {
+                // Differences in optionality between parameters and variables are allowed.
                 return true;
             }
             if (ts.hasQuestionToken(left) !== ts.hasQuestionToken(right)) {
                 return false;
             }
-            var interestingFlags = 8 |
-                16 |
-                256 |
-                128 |
-                64 |
-                32;
+            var interestingFlags = 8 /* Private */ |
+                16 /* Protected */ |
+                256 /* Async */ |
+                128 /* Abstract */ |
+                64 /* Readonly */ |
+                32 /* Static */;
             return ts.getSelectedModifierFlags(left, interestingFlags) === ts.getSelectedModifierFlags(right, interestingFlags);
         }
         function checkVariableDeclaration(node) {
@@ -39669,41 +50361,47 @@ var ts;
             return checkVariableLikeDeclaration(node);
         }
         function checkVariableStatement(node) {
+            // Grammar checking
             if (!checkGrammarDecoratorsAndModifiers(node) && !checkGrammarVariableDeclarationList(node.declarationList))
                 checkGrammarForDisallowedLetOrConstStatement(node);
             ts.forEach(node.declarationList.declarations, checkSourceElement);
         }
         function checkExpressionStatement(node) {
+            // Grammar checking
             checkGrammarStatementInAmbientContext(node);
             checkExpression(node.expression);
         }
         function checkIfStatement(node) {
+            // Grammar checking
             checkGrammarStatementInAmbientContext(node);
             checkExpression(node.expression);
             checkSourceElement(node.thenStatement);
-            if (node.thenStatement.kind === 215) {
+            if (node.thenStatement.kind === 215 /* EmptyStatement */) {
                 error(node.thenStatement, ts.Diagnostics.The_body_of_an_if_statement_cannot_be_the_empty_statement);
             }
             checkSourceElement(node.elseStatement);
         }
         function checkDoStatement(node) {
+            // Grammar checking
             checkGrammarStatementInAmbientContext(node);
             checkSourceElement(node.statement);
             checkExpression(node.expression);
         }
         function checkWhileStatement(node) {
+            // Grammar checking
             checkGrammarStatementInAmbientContext(node);
             checkExpression(node.expression);
             checkSourceElement(node.statement);
         }
         function checkForStatement(node) {
+            // Grammar checking
             if (!checkGrammarStatementInAmbientContext(node)) {
-                if (node.initializer && node.initializer.kind === 233) {
+                if (node.initializer && node.initializer.kind === 233 /* VariableDeclarationList */) {
                     checkGrammarVariableDeclarationList(node.initializer);
                 }
             }
             if (node.initializer) {
-                if (node.initializer.kind === 233) {
+                if (node.initializer.kind === 233 /* VariableDeclarationList */) {
                     ts.forEach(node.initializer.declarations, checkVariableDeclaration);
                 }
                 else {
@@ -39723,27 +50421,42 @@ var ts;
             checkGrammarForInOrForOfStatement(node);
             if (node.awaitModifier) {
                 var functionFlags = ts.getFunctionFlags(ts.getContainingFunction(node));
-                if ((functionFlags & (4 | 2)) === 2 && languageVersion < 6) {
-                    checkExternalEmitHelpers(node, 16384);
+                if ((functionFlags & (4 /* Invalid */ | 2 /* Async */)) === 2 /* Async */ && languageVersion < 6 /* ESNext */) {
+                    // for..await..of in an async function or async generator function prior to ESNext requires the __asyncValues helper
+                    checkExternalEmitHelpers(node, 16384 /* ForAwaitOfIncludes */);
                 }
             }
-            else if (compilerOptions.downlevelIteration && languageVersion < 2) {
-                checkExternalEmitHelpers(node, 256);
+            else if (compilerOptions.downlevelIteration && languageVersion < 2 /* ES2015 */) {
+                // for..of prior to ES2015 requires the __values helper when downlevelIteration is enabled
+                checkExternalEmitHelpers(node, 256 /* ForOfIncludes */);
             }
-            if (node.initializer.kind === 233) {
+            // Check the LHS and RHS
+            // If the LHS is a declaration, just check it as a variable declaration, which will in turn check the RHS
+            // via checkRightHandSideOfForOf.
+            // If the LHS is an expression, check the LHS, as a destructuring assignment or as a reference.
+            // Then check that the RHS is assignable to it.
+            if (node.initializer.kind === 233 /* VariableDeclarationList */) {
                 checkForInOrForOfVariableDeclaration(node);
             }
             else {
                 var varExpr = node.initializer;
                 var iteratedType = checkRightHandSideOfForOf(node.expression, node.awaitModifier);
-                if (varExpr.kind === 183 || varExpr.kind === 184) {
+                // There may be a destructuring assignment on the left side
+                if (varExpr.kind === 183 /* ArrayLiteralExpression */ || varExpr.kind === 184 /* ObjectLiteralExpression */) {
+                    // iteratedType may be undefined. In this case, we still want to check the structure of
+                    // varExpr, in particular making sure it's a valid LeftHandSideExpression. But we'd like
+                    // to short circuit the type relation checking as much as possible, so we pass the unknownType.
                     checkDestructuringAssignment(varExpr, iteratedType || errorType);
                 }
                 else {
                     var leftType = checkExpression(varExpr);
                     checkReferenceExpression(varExpr, ts.Diagnostics.The_left_hand_side_of_a_for_of_statement_must_be_a_variable_or_a_property_access);
+                    // iteratedType will be undefined if the rightType was missing properties/signatures
+                    // required to get its iteratedType (like [Symbol.iterator] or next). This may be
+                    // because we accessed properties from anyType, or it may have led to an error inside
+                    // getElementTypeOfIterable.
                     if (iteratedType) {
-                        checkTypeAssignableTo(iteratedType, leftType, varExpr, undefined);
+                        checkTypeAssignableTo(iteratedType, leftType, varExpr, /*headMessage*/ undefined);
                     }
                 }
             }
@@ -39753,9 +50466,15 @@ var ts;
             }
         }
         function checkForInStatement(node) {
+            // Grammar checking
             checkGrammarForInOrForOfStatement(node);
             var rightType = checkNonNullExpression(node.expression);
-            if (node.initializer.kind === 233) {
+            // TypeScript 1.0 spec (April 2014): 5.4
+            // In a 'for-in' statement of the form
+            // for (let VarDecl in Expr) Statement
+            //   VarDecl must be a variable declaration without a type annotation that declares a variable of type Any,
+            //   and Expr must be an expression of type Any, an object type, or a type parameter type.
+            if (node.initializer.kind === 233 /* VariableDeclarationList */) {
                 var variable = node.initializer.declarations[0];
                 if (variable && ts.isBindingPattern(variable.name)) {
                     error(variable.name, ts.Diagnostics.The_left_hand_side_of_a_for_in_statement_cannot_be_a_destructuring_pattern);
@@ -39763,19 +50482,26 @@ var ts;
                 checkForInOrForOfVariableDeclaration(node);
             }
             else {
+                // In a 'for-in' statement of the form
+                // for (Var in Expr) Statement
+                //   Var must be an expression classified as a reference of type Any or the String primitive type,
+                //   and Expr must be an expression of type Any, an object type, or a type parameter type.
                 var varExpr = node.initializer;
                 var leftType = checkExpression(varExpr);
-                if (varExpr.kind === 183 || varExpr.kind === 184) {
+                if (varExpr.kind === 183 /* ArrayLiteralExpression */ || varExpr.kind === 184 /* ObjectLiteralExpression */) {
                     error(varExpr, ts.Diagnostics.The_left_hand_side_of_a_for_in_statement_cannot_be_a_destructuring_pattern);
                 }
                 else if (!isTypeAssignableTo(getIndexTypeOrString(rightType), leftType)) {
                     error(varExpr, ts.Diagnostics.The_left_hand_side_of_a_for_in_statement_must_be_of_type_string_or_any);
                 }
                 else {
+                    // run check only former check succeeded to avoid cascading errors
                     checkReferenceExpression(varExpr, ts.Diagnostics.The_left_hand_side_of_a_for_in_statement_must_be_a_variable_or_a_property_access);
                 }
             }
-            if (rightType === neverType || !isTypeAssignableToKind(rightType, 16777216 | 14745600)) {
+            // unknownType is returned i.e. if node.expression is identifier whose name cannot be resolved
+            // in this case error about missing name is already reported - do not report extra one
+            if (rightType === neverType || !isTypeAssignableToKind(rightType, 16777216 /* NonPrimitive */ | 14745600 /* InstantiableNonPrimitive */)) {
                 error(node.expression, ts.Diagnostics.The_right_hand_side_of_a_for_in_statement_must_be_of_type_any_an_object_type_or_a_type_parameter_but_here_has_type_0, typeToString(rightType));
             }
             checkSourceElement(node.statement);
@@ -39785,6 +50511,7 @@ var ts;
         }
         function checkForInOrForOfVariableDeclaration(iterationStatement) {
             var variableDeclarationList = iterationStatement.initializer;
+            // checkGrammarForInOrForOfStatement will check that there is exactly one declaration.
             if (variableDeclarationList.declarations.length >= 1) {
                 var decl = variableDeclarationList.declarations[0];
                 checkVariableDeclaration(decl);
@@ -39792,23 +50519,32 @@ var ts;
         }
         function checkRightHandSideOfForOf(rhsExpression, awaitModifier) {
             var expressionType = checkNonNullExpression(rhsExpression);
-            return checkIteratedTypeOrElementType(expressionType, rhsExpression, true, awaitModifier !== undefined);
+            return checkIteratedTypeOrElementType(expressionType, rhsExpression, /*allowStringInput*/ true, awaitModifier !== undefined);
         }
         function checkIteratedTypeOrElementType(inputType, errorNode, allowStringInput, allowAsyncIterables) {
             if (isTypeAny(inputType)) {
                 return inputType;
             }
-            return getIteratedTypeOrElementType(inputType, errorNode, allowStringInput, allowAsyncIterables, true) || anyType;
+            return getIteratedTypeOrElementType(inputType, errorNode, allowStringInput, allowAsyncIterables, /*checkAssignability*/ true) || anyType;
         }
+        /**
+         * When consuming an iterable type in a for..of, spread, or iterator destructuring assignment
+         * we want to get the iterated type of an iterable for ES2015 or later, or the iterated type
+         * of a iterable (if defined globally) or element type of an array like for ES2015 or earlier.
+         */
         function getIteratedTypeOrElementType(inputType, errorNode, allowStringInput, allowAsyncIterables, checkAssignability) {
             if (inputType === neverType) {
-                reportTypeNotIterableError(errorNode, inputType, allowAsyncIterables);
+                reportTypeNotIterableError(errorNode, inputType, allowAsyncIterables); // TODO: GH#18217
                 return undefined;
             }
-            var uplevelIteration = languageVersion >= 2;
+            var uplevelIteration = languageVersion >= 2 /* ES2015 */;
             var downlevelIteration = !uplevelIteration && compilerOptions.downlevelIteration;
+            // Get the iterated type of an `Iterable<T>` or `IterableIterator<T>` only in ES2015
+            // or higher, when inside of an async generator or for-await-if, or when
+            // downlevelIteration is requested.
             if (uplevelIteration || downlevelIteration || allowAsyncIterables) {
-                var iteratedType = getIteratedTypeOfIterable(inputType, uplevelIteration ? errorNode : undefined, allowAsyncIterables, true, checkAssignability);
+                // We only report errors for an invalid iterable type in ES2015 or higher.
+                var iteratedType = getIteratedTypeOfIterable(inputType, uplevelIteration ? errorNode : undefined, allowAsyncIterables, /*allowSyncIterables*/ true, checkAssignability);
                 if (iteratedType || uplevelIteration) {
                     return iteratedType;
                 }
@@ -39816,33 +50552,45 @@ var ts;
             var arrayType = inputType;
             var reportedError = false;
             var hasStringConstituent = false;
+            // If strings are permitted, remove any string-like constituents from the array type.
+            // This allows us to find other non-string element types from an array unioned with
+            // a string.
             if (allowStringInput) {
-                if (arrayType.flags & 262144) {
+                if (arrayType.flags & 262144 /* Union */) {
+                    // After we remove all types that are StringLike, we will know if there was a string constituent
+                    // based on whether the result of filter is a new array.
                     var arrayTypes = inputType.types;
-                    var filteredTypes = ts.filter(arrayTypes, function (t) { return !(t.flags & 68); });
+                    var filteredTypes = ts.filter(arrayTypes, function (t) { return !(t.flags & 68 /* StringLike */); });
                     if (filteredTypes !== arrayTypes) {
-                        arrayType = getUnionType(filteredTypes, 2);
+                        arrayType = getUnionType(filteredTypes, 2 /* Subtype */);
                     }
                 }
-                else if (arrayType.flags & 68) {
+                else if (arrayType.flags & 68 /* StringLike */) {
                     arrayType = neverType;
                 }
                 hasStringConstituent = arrayType !== inputType;
                 if (hasStringConstituent) {
-                    if (languageVersion < 1) {
+                    if (languageVersion < 1 /* ES5 */) {
                         if (errorNode) {
                             error(errorNode, ts.Diagnostics.Using_a_string_in_a_for_of_statement_is_only_supported_in_ECMAScript_5_and_higher);
                             reportedError = true;
                         }
                     }
-                    if (arrayType.flags & 32768) {
+                    // Now that we've removed all the StringLike types, if no constituents remain, then the entire
+                    // arrayOrStringType was a string.
+                    if (arrayType.flags & 32768 /* Never */) {
                         return stringType;
                     }
                 }
             }
             if (!isArrayLikeType(arrayType)) {
                 if (errorNode && !reportedError) {
-                    var isIterable = !!getIteratedTypeOfIterable(inputType, undefined, allowAsyncIterables, true, checkAssignability);
+                    // Which error we report depends on whether we allow strings or if there was a
+                    // string constituent. For example, if the input type is number | string, we
+                    // want to say that number is not an array type. But if the input was just
+                    // number and string input is allowed, we want to say that number is not an
+                    // array type or a string type.
+                    var isIterable = !!getIteratedTypeOfIterable(inputType, /* errorNode */ undefined, allowAsyncIterables, /*allowSyncIterables*/ true, checkAssignability);
                     var diagnostic = !allowStringInput || hasStringConstituent
                         ? downlevelIteration
                             ? ts.Diagnostics.Type_0_is_not_an_array_type_or_does_not_have_a_Symbol_iterator_method_that_returns_an_iterator
@@ -39858,15 +50606,54 @@ var ts;
                 }
                 return hasStringConstituent ? stringType : undefined;
             }
-            var arrayElementType = getIndexTypeOfType(arrayType, 1);
+            var arrayElementType = getIndexTypeOfType(arrayType, 1 /* Number */);
             if (hasStringConstituent && arrayElementType) {
-                if (arrayElementType.flags & 68) {
+                // This is just an optimization for the case where arrayOrStringType is string | string[]
+                if (arrayElementType.flags & 68 /* StringLike */) {
                     return stringType;
                 }
-                return getUnionType([arrayElementType, stringType], 2);
+                return getUnionType([arrayElementType, stringType], 2 /* Subtype */);
             }
             return arrayElementType;
         }
+        /**
+         * We want to treat type as an iterable, and get the type it is an iterable of. The iterable
+         * must have the following structure (annotated with the names of the variables below):
+         *
+         *     { // iterable
+         *         [Symbol.iterator]: { // iteratorMethod
+         *             (): Iterator<T>
+         *         }
+         *     }
+         *
+         * For an async iterable, we expect the following structure:
+         *
+         *     { // iterable
+         *         [Symbol.asyncIterator]: { // iteratorMethod
+         *             (): AsyncIterator<T>
+         *         }
+         *     }
+         *
+         * T is the type we are after. At every level that involves analyzing return types
+         * of signatures, we union the return types of all the signatures.
+         *
+         * Another thing to note is that at any step of this process, we could run into a dead end,
+         * meaning either the property is missing, or we run into the anyType. If either of these things
+         * happens, we return undefined to signal that we could not find the iterated type. If a property
+         * is missing, and the previous step did not result in 'any', then we also give an error if the
+         * caller requested it. Then the caller can decide what to do in the case where there is no iterated
+         * type. This is different from returning anyType, because that would signify that we have matched the
+         * whole pattern and that T (above) is 'any'.
+         *
+         * For a **for-of** statement, `yield*` (in a normal generator), spread, array
+         * destructuring, or normal generator we will only ever look for a `[Symbol.iterator]()`
+         * method.
+         *
+         * For an async generator we will only ever look at the `[Symbol.asyncIterator]()` method.
+         *
+         * For a **for-await-of** statement or a `yield*` in an async generator we will look for
+         * the `[Symbol.asyncIterator]()` method first, and then the `[Symbol.iterator]()` method.
+         */
         function getIteratedTypeOfIterable(type, errorNode, allowAsyncIterables, allowSyncIterables, checkAssignability) {
             if (isTypeAny(type)) {
                 return undefined;
@@ -39878,8 +50665,10 @@ var ts;
                     if (typeAsIterable.iteratedTypeOfAsyncIterable) {
                         return typeAsIterable.iteratedTypeOfAsyncIterable;
                     }
-                    if (isReferenceToType(type, getGlobalAsyncIterableType(false)) ||
-                        isReferenceToType(type, getGlobalAsyncIterableIteratorType(false))) {
+                    // As an optimization, if the type is an instantiation of the global `AsyncIterable<T>`
+                    // or the global `AsyncIterableIterator<T>` then just grab its type argument.
+                    if (isReferenceToType(type, getGlobalAsyncIterableType(/*reportErrors*/ false)) ||
+                        isReferenceToType(type, getGlobalAsyncIterableIteratorType(/*reportErrors*/ false))) {
                         return typeAsIterable.iteratedTypeOfAsyncIterable = type.typeArguments[0];
                     }
                 }
@@ -39887,8 +50676,10 @@ var ts;
                     if (typeAsIterable.iteratedTypeOfIterable) {
                         return typeAsIterable.iteratedTypeOfIterable;
                     }
-                    if (isReferenceToType(type, getGlobalIterableType(false)) ||
-                        isReferenceToType(type, getGlobalIterableIteratorType(false))) {
+                    // As an optimization, if the type is an instantiation of the global `Iterable<T>` or
+                    // `IterableIterator<T>` then just grab its type argument.
+                    if (isReferenceToType(type, getGlobalIterableType(/*reportErrors*/ false)) ||
+                        isReferenceToType(type, getGlobalIterableIteratorType(/*reportErrors*/ false))) {
                         return typeAsIterable.iteratedTypeOfIterable = type.typeArguments[0];
                     }
                 }
@@ -39897,17 +50688,21 @@ var ts;
                 if (isTypeAny(methodType)) {
                     return undefined;
                 }
-                var signatures = methodType ? getSignaturesOfType(methodType, 0) : undefined;
+                var signatures = methodType ? getSignaturesOfType(methodType, 0 /* Call */) : undefined;
                 if (!ts.some(signatures)) {
                     if (errorNode) {
+                        // only report on the first error
                         reportTypeNotIterableError(errorNode, type, allowAsyncIterables);
                         errorNode = undefined;
                     }
                     return undefined;
                 }
-                var returnType = getUnionType(ts.map(signatures, getReturnTypeOfSignature), 2);
-                var iteratedType = getIteratedTypeOfIterator(returnType, errorNode, !!asyncMethodType);
+                var returnType = getUnionType(ts.map(signatures, getReturnTypeOfSignature), 2 /* Subtype */);
+                var iteratedType = getIteratedTypeOfIterator(returnType, errorNode, /*isAsyncIterator*/ !!asyncMethodType);
                 if (checkAssignability && errorNode && iteratedType) {
+                    // If `checkAssignability` was specified, we were called from
+                    // `checkIteratedTypeOrElementType`. As such, we need to validate that
+                    // the type passed in is actually an Iterable.
                     checkTypeAssignableTo(type, asyncMethodType
                         ? createAsyncIterableType(iteratedType)
                         : createIterableType(iteratedType), errorNode);
@@ -39922,6 +50717,28 @@ var ts;
                 ? ts.Diagnostics.Type_0_must_have_a_Symbol_asyncIterator_method_that_returns_an_async_iterator
                 : ts.Diagnostics.Type_0_must_have_a_Symbol_iterator_method_that_returns_an_iterator, typeToString(type));
         }
+        /**
+         * This function has very similar logic as getIteratedTypeOfIterable, except that it operates on
+         * Iterators instead of Iterables. Here is the structure:
+         *
+         *  { // iterator
+         *      next: { // nextMethod
+         *          (): { // nextResult
+         *              value: T // nextValue
+         *          }
+         *      }
+         *  }
+         *
+         * For an async iterator, we expect the following structure:
+         *
+         *  { // iterator
+         *      next: { // nextMethod
+         *          (): PromiseLike<{ // nextResult
+         *              value: T // nextValue
+         *          }>
+         *      }
+         *  }
+         */
         function getIteratedTypeOfIterator(type, errorNode, isAsyncIterator) {
             if (isTypeAny(type)) {
                 return undefined;
@@ -39930,17 +50747,21 @@ var ts;
             if (isAsyncIterator ? typeAsIterator.iteratedTypeOfAsyncIterator : typeAsIterator.iteratedTypeOfIterator) {
                 return isAsyncIterator ? typeAsIterator.iteratedTypeOfAsyncIterator : typeAsIterator.iteratedTypeOfIterator;
             }
+            // As an optimization, if the type is an instantiation of the global `Iterator<T>` (for
+            // a non-async iterator) or the global `AsyncIterator<T>` (for an async-iterator) then
+            // just grab its type argument.
             var getIteratorType = isAsyncIterator ? getGlobalAsyncIteratorType : getGlobalIteratorType;
-            if (isReferenceToType(type, getIteratorType(false))) {
+            if (isReferenceToType(type, getIteratorType(/*reportErrors*/ false))) {
                 return isAsyncIterator
                     ? typeAsIterator.iteratedTypeOfAsyncIterator = type.typeArguments[0]
                     : typeAsIterator.iteratedTypeOfIterator = type.typeArguments[0];
             }
+            // Both async and non-async iterators must have a `next` method.
             var nextMethod = getTypeOfPropertyOfType(type, "next");
             if (isTypeAny(nextMethod)) {
                 return undefined;
             }
-            var nextMethodSignatures = nextMethod ? getSignaturesOfType(nextMethod, 0) : ts.emptyArray;
+            var nextMethodSignatures = nextMethod ? getSignaturesOfType(nextMethod, 0 /* Call */) : ts.emptyArray;
             if (nextMethodSignatures.length === 0) {
                 if (errorNode) {
                     error(errorNode, isAsyncIterator
@@ -39949,10 +50770,11 @@ var ts;
                 }
                 return undefined;
             }
-            var nextResult = getUnionType(ts.map(nextMethodSignatures, getReturnTypeOfSignature), 2);
+            var nextResult = getUnionType(ts.map(nextMethodSignatures, getReturnTypeOfSignature), 2 /* Subtype */);
             if (isTypeAny(nextResult)) {
                 return undefined;
             }
+            // For an async iterator, we must get the awaited type of the return type.
             if (isAsyncIterator) {
                 nextResult = getAwaitedTypeOfPromise(nextResult, errorNode, ts.Diagnostics.The_type_returned_by_the_next_method_of_an_async_iterator_must_be_a_promise_for_a_type_with_a_value_property);
                 if (isTypeAny(nextResult)) {
@@ -39972,28 +50794,37 @@ var ts;
                 ? typeAsIterator.iteratedTypeOfAsyncIterator = nextValue
                 : typeAsIterator.iteratedTypeOfIterator = nextValue;
         }
+        /**
+         * A generator may have a return type of `Iterator<T>`, `Iterable<T>`, or
+         * `IterableIterator<T>`. An async generator may have a return type of `AsyncIterator<T>`,
+         * `AsyncIterable<T>`, or `AsyncIterableIterator<T>`. This function can be used to extract
+         * the iterated type from this return type for contextual typing and verifying signatures.
+         */
         function getIteratedTypeOfGenerator(returnType, isAsyncGenerator) {
             if (isTypeAny(returnType)) {
                 return undefined;
             }
-            return getIteratedTypeOfIterable(returnType, undefined, isAsyncGenerator, !isAsyncGenerator, false)
-                || getIteratedTypeOfIterator(returnType, undefined, isAsyncGenerator);
+            return getIteratedTypeOfIterable(returnType, /*errorNode*/ undefined, /*allowAsyncIterables*/ isAsyncGenerator, /*allowSyncIterables*/ !isAsyncGenerator, /*checkAssignability*/ false)
+                || getIteratedTypeOfIterator(returnType, /*errorNode*/ undefined, isAsyncGenerator);
         }
         function checkBreakOrContinueStatement(node) {
+            // Grammar checking
             if (!checkGrammarStatementInAmbientContext(node))
                 checkGrammarBreakOrContinueStatement(node);
+            // TODO: Check that target label is valid
         }
         function isGetAccessorWithAnnotatedSetAccessor(node) {
-            return node.kind === 156
-                && ts.getEffectiveSetAccessorTypeAnnotationNode(ts.getDeclarationOfKind(node.symbol, 157)) !== undefined;
+            return node.kind === 156 /* GetAccessor */
+                && ts.getEffectiveSetAccessorTypeAnnotationNode(ts.getDeclarationOfKind(node.symbol, 157 /* SetAccessor */)) !== undefined;
         }
         function isUnwrappedReturnTypeVoidOrAny(func, returnType) {
-            var unwrappedReturnType = (ts.getFunctionFlags(func) & 3) === 2
-                ? getPromisedTypeOfPromise(returnType)
-                : returnType;
-            return !!unwrappedReturnType && maybeTypeOfKind(unwrappedReturnType, 4096 | 3);
+            var unwrappedReturnType = (ts.getFunctionFlags(func) & 3 /* AsyncGenerator */) === 2 /* Async */
+                ? getPromisedTypeOfPromise(returnType) // Async function
+                : returnType; // AsyncGenerator function, Generator function, or normal function
+            return !!unwrappedReturnType && maybeTypeOfKind(unwrappedReturnType, 4096 /* Void */ | 3 /* AnyOrUnknown */);
         }
         function checkReturnStatement(node) {
+            // Grammar checking
             if (checkGrammarStatementInAmbientContext(node)) {
                 return;
             }
@@ -40005,27 +50836,34 @@ var ts;
             var signature = getSignatureFromDeclaration(func);
             var returnType = getReturnTypeOfSignature(signature);
             var functionFlags = ts.getFunctionFlags(func);
-            var isGenerator = functionFlags & 1;
-            if (strictNullChecks || node.expression || returnType.flags & 32768) {
+            var isGenerator = functionFlags & 1 /* Generator */;
+            if (strictNullChecks || node.expression || returnType.flags & 32768 /* Never */) {
                 var exprType = node.expression ? checkExpressionCached(node.expression) : undefinedType;
-                if (isGenerator) {
+                if (isGenerator) { // AsyncGenerator function or Generator function
+                    // A generator does not need its return expressions checked against its return type.
+                    // Instead, the yield expressions are checked against the element type.
+                    // TODO: Check return types of generators when return type tracking is added
+                    // for generators.
                     return;
                 }
-                else if (func.kind === 157) {
+                else if (func.kind === 157 /* SetAccessor */) {
                     if (node.expression) {
                         error(node, ts.Diagnostics.Setters_cannot_return_a_value);
                     }
                 }
-                else if (func.kind === 155) {
+                else if (func.kind === 155 /* Constructor */) {
                     if (node.expression && !checkTypeAssignableTo(exprType, returnType, node)) {
                         error(node, ts.Diagnostics.Return_type_of_constructor_signature_must_be_assignable_to_the_instance_type_of_the_class);
                     }
                 }
                 else if (ts.getEffectiveReturnTypeNode(func) || isGetAccessorWithAnnotatedSetAccessor(func)) {
-                    if (functionFlags & 2) {
+                    if (functionFlags & 2 /* Async */) { // Async function
                         var promisedType = getPromisedTypeOfPromise(returnType);
                         var awaitedType = checkAwaitedType(exprType, node, ts.Diagnostics.The_return_type_of_an_async_function_must_either_be_a_valid_promise_or_must_not_contain_a_callable_then_member);
                         if (promisedType) {
+                            // If the function has a return type, but promisedType is
+                            // undefined, an error will be reported in checkAsyncFunctionReturnType
+                            // so we don't need to report one here.
                             checkTypeAssignableTo(awaitedType, promisedType, node);
                         }
                     }
@@ -40034,13 +50872,15 @@ var ts;
                     }
                 }
             }
-            else if (func.kind !== 155 && compilerOptions.noImplicitReturns && !isUnwrappedReturnTypeVoidOrAny(func, returnType) && !isGenerator) {
+            else if (func.kind !== 155 /* Constructor */ && compilerOptions.noImplicitReturns && !isUnwrappedReturnTypeVoidOrAny(func, returnType) && !isGenerator) {
+                // The function has a return type, but the return statement doesn't have an expression.
                 error(node, ts.Diagnostics.Not_all_code_paths_return_a_value);
             }
         }
         function checkWithStatement(node) {
+            // Grammar checking for withStatement
             if (!checkGrammarStatementInAmbientContext(node)) {
-                if (node.flags & 16384) {
+                if (node.flags & 16384 /* AwaitContext */) {
                     grammarErrorOnFirstToken(node, ts.Diagnostics.with_statements_are_not_allowed_in_an_async_function_block);
                 }
             }
@@ -40053,13 +50893,15 @@ var ts;
             }
         }
         function checkSwitchStatement(node) {
+            // Grammar checking
             checkGrammarStatementInAmbientContext(node);
             var firstDefaultClause;
             var hasDuplicateDefaultClause = false;
             var expressionType = checkExpression(node.expression);
             var expressionIsLiteral = isLiteralType(expressionType);
             ts.forEach(node.caseBlock.clauses, function (clause) {
-                if (clause.kind === 267 && !hasDuplicateDefaultClause) {
+                // Grammar check for duplicate default clauses, skip if we already report duplicate default clause
+                if (clause.kind === 267 /* DefaultClause */ && !hasDuplicateDefaultClause) {
                     if (firstDefaultClause === undefined) {
                         firstDefaultClause = clause;
                     }
@@ -40071,7 +50913,10 @@ var ts;
                         hasDuplicateDefaultClause = true;
                     }
                 }
-                if (produceDiagnostics && clause.kind === 266) {
+                if (produceDiagnostics && clause.kind === 266 /* CaseClause */) {
+                    // TypeScript 1.0 spec (April 2014): 5.9
+                    // In a 'switch' statement, each 'case' expression must be of a type that is comparable
+                    // to or from the type of the 'switch' expression.
                     var caseType = checkExpression(clause.expression);
                     var caseIsLiteral = isLiteralType(caseType);
                     var comparedExpressionType = expressionType;
@@ -40080,7 +50925,8 @@ var ts;
                         comparedExpressionType = getBaseTypeOfLiteralType(expressionType);
                     }
                     if (!isTypeEqualityComparableTo(comparedExpressionType, caseType)) {
-                        checkTypeComparableTo(caseType, comparedExpressionType, clause.expression, undefined);
+                        // expressionType is not comparable to caseType, try the reversed check and report errors if it fails
+                        checkTypeComparableTo(caseType, comparedExpressionType, clause.expression, /*headMessage*/ undefined);
                     }
                 }
                 ts.forEach(clause.statements, checkSourceElement);
@@ -40090,21 +50936,24 @@ var ts;
             }
         }
         function checkLabeledStatement(node) {
+            // Grammar checking
             if (!checkGrammarStatementInAmbientContext(node)) {
                 ts.findAncestor(node.parent, function (current) {
                     if (ts.isFunctionLike(current)) {
                         return "quit";
                     }
-                    if (current.kind === 228 && current.label.escapedText === node.label.escapedText) {
+                    if (current.kind === 228 /* LabeledStatement */ && current.label.escapedText === node.label.escapedText) {
                         grammarErrorOnNode(node.label, ts.Diagnostics.Duplicate_label_0, ts.getTextOfNode(node.label));
                         return true;
                     }
                     return false;
                 });
             }
+            // ensure that label is unique
             checkSourceElement(node.statement);
         }
         function checkThrowStatement(node) {
+            // Grammar checking
             if (!checkGrammarStatementInAmbientContext(node)) {
                 if (node.expression === undefined) {
                     grammarErrorAfterFirstToken(node, ts.Diagnostics.Line_break_not_permitted_here);
@@ -40115,10 +50964,12 @@ var ts;
             }
         }
         function checkTryStatement(node) {
+            // Grammar checking
             checkGrammarStatementInAmbientContext(node);
             checkBlock(node.tryBlock);
             var catchClause = node.catchClause;
             if (catchClause) {
+                // Grammar checking
                 if (catchClause.variableDeclaration) {
                     if (catchClause.variableDeclaration.type) {
                         grammarErrorOnFirstToken(catchClause.variableDeclaration.type, ts.Diagnostics.Catch_clause_variable_cannot_have_a_type_annotation);
@@ -40131,7 +50982,7 @@ var ts;
                         if (blockLocals_1) {
                             ts.forEachKey(catchClause.locals, function (caughtName) {
                                 var blockLocal = blockLocals_1.get(caughtName);
-                                if (blockLocal && (blockLocal.flags & 2) !== 0) {
+                                if (blockLocal && (blockLocal.flags & 2 /* BlockScopedVariable */) !== 0) {
                                     grammarErrorOnNode(blockLocal.valueDeclaration, ts.Diagnostics.Cannot_redeclare_identifier_0_in_catch_clause, caughtName);
                                 }
                             });
@@ -40145,25 +50996,28 @@ var ts;
             }
         }
         function checkIndexConstraints(type) {
-            var declaredNumberIndexer = getIndexDeclarationOfSymbol(type.symbol, 1);
-            var declaredStringIndexer = getIndexDeclarationOfSymbol(type.symbol, 0);
-            var stringIndexType = getIndexTypeOfType(type, 0);
-            var numberIndexType = getIndexTypeOfType(type, 1);
+            var declaredNumberIndexer = getIndexDeclarationOfSymbol(type.symbol, 1 /* Number */);
+            var declaredStringIndexer = getIndexDeclarationOfSymbol(type.symbol, 0 /* String */);
+            var stringIndexType = getIndexTypeOfType(type, 0 /* String */);
+            var numberIndexType = getIndexTypeOfType(type, 1 /* Number */);
             if (stringIndexType || numberIndexType) {
                 ts.forEach(getPropertiesOfObjectType(type), function (prop) {
                     var propType = getTypeOfSymbol(prop);
-                    checkIndexConstraintForProperty(prop, propType, type, declaredStringIndexer, stringIndexType, 0);
-                    checkIndexConstraintForProperty(prop, propType, type, declaredNumberIndexer, numberIndexType, 1);
+                    checkIndexConstraintForProperty(prop, propType, type, declaredStringIndexer, stringIndexType, 0 /* String */);
+                    checkIndexConstraintForProperty(prop, propType, type, declaredNumberIndexer, numberIndexType, 1 /* Number */);
                 });
                 var classDeclaration = type.symbol.valueDeclaration;
-                if (ts.getObjectFlags(type) & 1 && ts.isClassLike(classDeclaration)) {
+                if (ts.getObjectFlags(type) & 1 /* Class */ && ts.isClassLike(classDeclaration)) {
                     for (var _i = 0, _a = classDeclaration.members; _i < _a.length; _i++) {
                         var member = _a[_i];
-                        if (!ts.hasModifier(member, 32) && hasNonBindableDynamicName(member)) {
+                        // Only process instance properties with computed names here.
+                        // Static properties cannot be in conflict with indexers,
+                        // and properties with literal names were already checked.
+                        if (!ts.hasModifier(member, 32 /* Static */) && hasNonBindableDynamicName(member)) {
                             var symbol = getSymbolOfNode(member);
                             var propType = getTypeOfSymbol(symbol);
-                            checkIndexConstraintForProperty(symbol, propType, type, declaredStringIndexer, stringIndexType, 0);
-                            checkIndexConstraintForProperty(symbol, propType, type, declaredNumberIndexer, numberIndexType, 1);
+                            checkIndexConstraintForProperty(symbol, propType, type, declaredStringIndexer, stringIndexType, 0 /* String */);
+                            checkIndexConstraintForProperty(symbol, propType, type, declaredNumberIndexer, numberIndexType, 1 /* Number */);
                         }
                     }
                 }
@@ -40171,38 +51025,46 @@ var ts;
             var errorNode;
             if (stringIndexType && numberIndexType) {
                 errorNode = declaredNumberIndexer || declaredStringIndexer;
-                if (!errorNode && (ts.getObjectFlags(type) & 2)) {
-                    var someBaseTypeHasBothIndexers = ts.forEach(getBaseTypes(type), function (base) { return getIndexTypeOfType(base, 0) && getIndexTypeOfType(base, 1); });
+                // condition 'errorNode === undefined' may appear if types does not declare nor string neither number indexer
+                if (!errorNode && (ts.getObjectFlags(type) & 2 /* Interface */)) {
+                    var someBaseTypeHasBothIndexers = ts.forEach(getBaseTypes(type), function (base) { return getIndexTypeOfType(base, 0 /* String */) && getIndexTypeOfType(base, 1 /* Number */); });
                     errorNode = someBaseTypeHasBothIndexers ? undefined : type.symbol.declarations[0];
                 }
             }
-            if (errorNode && !isTypeAssignableTo(numberIndexType, stringIndexType)) {
+            if (errorNode && !isTypeAssignableTo(numberIndexType, stringIndexType)) { // TODO: GH#18217
                 error(errorNode, ts.Diagnostics.Numeric_index_type_0_is_not_assignable_to_string_index_type_1, typeToString(numberIndexType), typeToString(stringIndexType));
             }
             function checkIndexConstraintForProperty(prop, propertyType, containingType, indexDeclaration, indexType, indexKind) {
+                // ESSymbol properties apply to neither string nor numeric indexers.
                 if (!indexType || ts.isKnownSymbol(prop)) {
                     return;
                 }
                 var propDeclaration = prop.valueDeclaration;
-                if (indexKind === 1 && !(propDeclaration ? isNumericName(ts.getNameOfDeclaration(propDeclaration)) : isNumericLiteralName(prop.escapedName))) {
+                // index is numeric and property name is not valid numeric literal
+                if (indexKind === 1 /* Number */ && !(propDeclaration ? isNumericName(ts.getNameOfDeclaration(propDeclaration)) : isNumericLiteralName(prop.escapedName))) {
                     return;
                 }
+                // perform property check if property or indexer is declared in 'type'
+                // this allows us to rule out cases when both property and indexer are inherited from the base class
                 var errorNode;
                 if (propDeclaration &&
-                    (propDeclaration.kind === 200 ||
-                        ts.getNameOfDeclaration(propDeclaration).kind === 147 ||
+                    (propDeclaration.kind === 200 /* BinaryExpression */ ||
+                        ts.getNameOfDeclaration(propDeclaration).kind === 147 /* ComputedPropertyName */ ||
                         prop.parent === containingType.symbol)) {
                     errorNode = propDeclaration;
                 }
                 else if (indexDeclaration) {
                     errorNode = indexDeclaration;
                 }
-                else if (ts.getObjectFlags(containingType) & 2) {
+                else if (ts.getObjectFlags(containingType) & 2 /* Interface */) {
+                    // for interfaces property and indexer might be inherited from different bases
+                    // check if any base class already has both property and indexer.
+                    // check should be performed only if 'type' is the first type that brings property\indexer together
                     var someBaseClassHasBothPropertyAndIndexer = ts.forEach(getBaseTypes(containingType), function (base) { return getPropertyOfObjectType(base, prop.escapedName) && getIndexTypeOfType(base, indexKind); });
                     errorNode = someBaseClassHasBothPropertyAndIndexer ? undefined : containingType.symbol.declarations[0];
                 }
                 if (errorNode && !isTypeAssignableTo(propertyType, indexType)) {
-                    var errorMessage = indexKind === 0
+                    var errorMessage = indexKind === 0 /* String */
                         ? ts.Diagnostics.Property_0_of_type_1_is_not_assignable_to_string_index_type_2
                         : ts.Diagnostics.Property_0_of_type_1_is_not_assignable_to_numeric_index_type_2;
                     error(errorNode, errorMessage, symbolToString(prop), typeToString(propertyType), typeToString(indexType));
@@ -40210,6 +51072,8 @@ var ts;
             }
         }
         function checkTypeNameIsReserved(name, message) {
+            // TS 1.0 spec (April 2014): 3.6.1
+            // The predefined type keywords are reserved and cannot be used as names of user defined types.
             switch (name.escapedText) {
                 case "any":
                 case "unknown":
@@ -40222,12 +51086,18 @@ var ts;
                     error(name, message, name.escapedText);
             }
         }
+        /**
+         * The name cannot be used as 'Object' of user defined types with special target.
+         */
         function checkClassNameCollisionWithObject(name) {
-            if (languageVersion === 1 && name.escapedText === "Object"
+            if (languageVersion === 1 /* ES5 */ && name.escapedText === "Object"
                 && moduleKind !== ts.ModuleKind.ES2015 && moduleKind !== ts.ModuleKind.ESNext) {
-                error(name, ts.Diagnostics.Class_name_cannot_be_Object_when_targeting_ES5_with_module_0, ts.ModuleKind[moduleKind]);
+                error(name, ts.Diagnostics.Class_name_cannot_be_Object_when_targeting_ES5_with_module_0, ts.ModuleKind[moduleKind]); // https://github.com/Microsoft/TypeScript/issues/17494
             }
         }
+        /**
+         * Check each type parameter and check that type parameters have no duplicate type parameter declarations
+         */
         function checkTypeParameters(typeParameterDeclarations) {
             if (typeParameterDeclarations) {
                 var seenDefault = false;
@@ -40250,6 +51120,7 @@ var ts;
                 }
             }
         }
+        /** Check that type parameter lists are identical across multiple declarations */
         function checkTypeParameterListsIdentical(symbol) {
             if (symbol.declarations.length === 1) {
                 return;
@@ -40263,9 +51134,10 @@ var ts;
                 }
                 var type = getDeclaredTypeOfSymbol(symbol);
                 if (!areTypeParametersIdentical(declarations, type.localTypeParameters)) {
+                    // Report an error on every conflicting declaration.
                     var name = symbolToString(symbol);
-                    for (var _i = 0, declarations_6 = declarations; _i < declarations_6.length; _i++) {
-                        var declaration = declarations_6[_i];
+                    for (var _i = 0, declarations_5 = declarations; _i < declarations_5.length; _i++) {
+                        var declaration = declarations_5[_i];
                         error(declaration.name, ts.Diagnostics.All_declarations_of_0_must_have_identical_type_parameters, name);
                     }
                 }
@@ -40274,8 +51146,9 @@ var ts;
         function areTypeParametersIdentical(declarations, targetParameters) {
             var maxTypeArgumentCount = ts.length(targetParameters);
             var minTypeArgumentCount = getMinTypeArgumentCount(targetParameters);
-            for (var _i = 0, declarations_7 = declarations; _i < declarations_7.length; _i++) {
-                var declaration = declarations_7[_i];
+            for (var _i = 0, declarations_6 = declarations; _i < declarations_6.length; _i++) {
+                var declaration = declarations_6[_i];
+                // If this declaration has too few or too many type parameters, we report an error
                 var sourceParameters = ts.getEffectiveTypeParameterDeclarations(declaration);
                 var numTypeParameters = sourceParameters.length;
                 if (numTypeParameters < minTypeArgumentCount || numTypeParameters > maxTypeArgumentCount) {
@@ -40284,16 +51157,23 @@ var ts;
                 for (var i = 0; i < numTypeParameters; i++) {
                     var source = sourceParameters[i];
                     var target = targetParameters[i];
+                    // If the type parameter node does not have the same as the resolved type
+                    // parameter at this position, we report an error.
                     if (source.name.escapedText !== target.symbol.escapedName) {
                         return false;
                     }
+                    // If the type parameter node does not have an identical constraint as the resolved
+                    // type parameter at this position, we report an error.
                     var sourceConstraint = source.constraint && getTypeFromTypeNode(source.constraint);
                     var targetConstraint = getConstraintFromTypeParameter(target);
                     if (sourceConstraint) {
+                        // relax check if later interface augmentation has no constraint
                         if (!targetConstraint || !isTypeIdenticalTo(sourceConstraint, targetConstraint)) {
                             return false;
                         }
                     }
+                    // If the type parameter node has a default and it is not identical to the default
+                    // for the type parameter at this position, we report an error.
                     var sourceDefault = source.default && getTypeFromTypeNode(source.default);
                     var targetDefault = getDefaultFromTypeParameter(target);
                     if (sourceDefault && targetDefault && !isTypeIdenticalTo(sourceDefault, targetDefault)) {
@@ -40313,7 +51193,7 @@ var ts;
             registerForUnusedIdentifiersCheck(node);
         }
         function checkClassDeclaration(node) {
-            if (!node.name && !ts.hasModifier(node, 512)) {
+            if (!node.name && !ts.hasModifier(node, 512 /* Default */)) {
                 grammarErrorOnFirstToken(node, ts.Diagnostics.A_class_declaration_without_the_default_modifier_must_have_a_name);
             }
             checkClassLikeDeclaration(node);
@@ -40327,7 +51207,7 @@ var ts;
                 checkTypeNameIsReserved(node.name, ts.Diagnostics.Class_name_cannot_be_0);
                 checkCollisionWithRequireExportsInGeneratedCode(node, node.name);
                 checkCollisionWithGlobalPromiseInGeneratedCode(node, node.name);
-                if (!(node.flags & 4194304)) {
+                if (!(node.flags & 4194304 /* Ambient */)) {
                     checkClassNameCollisionWithObject(node.name);
                 }
             }
@@ -40339,13 +51219,14 @@ var ts;
             var staticType = getTypeOfSymbol(symbol);
             checkTypeParameterListsIdentical(symbol);
             checkClassForDuplicateDeclarations(node);
-            if (!(node.flags & 4194304)) {
+            // Only check for reserved static identifiers on non-ambient context.
+            if (!(node.flags & 4194304 /* Ambient */)) {
                 checkClassForStaticPropertyNameConflicts(node);
             }
             var baseTypeNode = ts.getClassExtendsHeritageClauseElement(node);
             if (baseTypeNode) {
-                if (languageVersion < 2) {
-                    checkExternalEmitHelpers(baseTypeNode.parent, 1);
+                if (languageVersion < 2 /* ES2015 */) {
+                    checkExternalEmitHelpers(baseTypeNode.parent, 1 /* Extends */);
                 }
                 var baseTypes = getBaseTypes(type);
                 if (baseTypes.length && produceDiagnostics) {
@@ -40364,14 +51245,18 @@ var ts;
                         }
                     }
                     var baseWithThis = getTypeWithThisArgument(baseType_1, type.thisType);
-                    if (!checkTypeAssignableTo(typeWithThis, baseWithThis, undefined)) {
+                    if (!checkTypeAssignableTo(typeWithThis, baseWithThis, /*errorNode*/ undefined)) {
                         issueMemberSpecificError(node, typeWithThis, baseWithThis, ts.Diagnostics.Class_0_incorrectly_extends_base_class_1);
                     }
                     checkTypeAssignableTo(staticType, getTypeWithoutSignatures(staticBaseType), node.name || node, ts.Diagnostics.Class_static_side_0_incorrectly_extends_base_class_static_side_1);
-                    if (baseConstructorType.flags & 2162688 && !isMixinConstructorType(staticType)) {
+                    if (baseConstructorType.flags & 2162688 /* TypeVariable */ && !isMixinConstructorType(staticType)) {
                         error(node.name || node, ts.Diagnostics.A_mixin_class_must_have_a_constructor_with_a_single_rest_parameter_of_type_any);
                     }
-                    if (!(staticBaseType.symbol && staticBaseType.symbol.flags & 32) && !(baseConstructorType.flags & 2162688)) {
+                    if (!(staticBaseType.symbol && staticBaseType.symbol.flags & 32 /* Class */) && !(baseConstructorType.flags & 2162688 /* TypeVariable */)) {
+                        // When the static base type is a "class-like" constructor function (but not actually a class), we verify
+                        // that all instantiated base constructor signatures return the same type. We can simply compare the type
+                        // references (as opposed to checking the structure of the types) because elsewhere we have already checked
+                        // that the base type is a class or interface type (and not, for example, an anonymous object type).
                         var constructors = getInstantiatedConstructorsForTypeArguments(staticBaseType, baseTypeNode.typeArguments, baseTypeNode);
                         if (ts.forEach(constructors, function (sig) { return getReturnTypeOfSignature(sig) !== baseType_1; })) {
                             error(baseTypeNode.expression, ts.Diagnostics.Base_constructors_must_all_have_the_same_return_type);
@@ -40392,11 +51277,11 @@ var ts;
                         var t = getTypeFromTypeNode(typeRefNode);
                         if (t !== errorType) {
                             if (isValidBaseType(t)) {
-                                var genericDiag = t.symbol && t.symbol.flags & 32 ?
+                                var genericDiag = t.symbol && t.symbol.flags & 32 /* Class */ ?
                                     ts.Diagnostics.Class_0_incorrectly_implements_class_1_Did_you_mean_to_extend_1_and_inherit_its_members_as_a_subclass :
                                     ts.Diagnostics.Class_0_incorrectly_implements_interface_1;
                                 var baseWithThis = getTypeWithThisArgument(t, type.thisType);
-                                if (!checkTypeAssignableTo(typeWithThis, baseWithThis, undefined)) {
+                                if (!checkTypeAssignableTo(typeWithThis, baseWithThis, /*errorNode*/ undefined)) {
                                     issueMemberSpecificError(node, typeWithThis, baseWithThis, genericDiag);
                                 }
                             }
@@ -40414,8 +51299,9 @@ var ts;
             }
         }
         function issueMemberSpecificError(node, typeWithThis, baseWithThis, broadDiag) {
+            // iterate over all implemented properties and issue errors on each one which isn't compatible, rather than the class as a whole, if possible
             var issuedMemberError = false;
-            var _loop_8 = function (member) {
+            var _loop_6 = function (member) {
                 if (ts.hasStaticModifier(member)) {
                     return "continue";
                 }
@@ -40424,8 +51310,9 @@ var ts;
                     var prop = getPropertyOfType(typeWithThis, declaredProp.escapedName);
                     var baseProp = getPropertyOfType(baseWithThis, declaredProp.escapedName);
                     if (prop && baseProp) {
-                        var rootChain = function () { return ts.chainDiagnosticMessages(undefined, ts.Diagnostics.Property_0_in_type_1_is_not_assignable_to_the_same_property_in_base_type_2, symbolToString(declaredProp), typeToString(typeWithThis), typeToString(baseWithThis)); };
-                        if (!checkTypeAssignableTo(getTypeOfSymbol(prop), getTypeOfSymbol(baseProp), member.name || member, undefined, rootChain)) {
+                        var rootChain = function () { return ts.chainDiagnosticMessages(
+                        /*details*/ undefined, ts.Diagnostics.Property_0_in_type_1_is_not_assignable_to_the_same_property_in_base_type_2, symbolToString(declaredProp), typeToString(typeWithThis), typeToString(baseWithThis)); };
+                        if (!checkTypeAssignableTo(getTypeOfSymbol(prop), getTypeOfSymbol(baseProp), member.name || member, /*message*/ undefined, rootChain)) {
                             issuedMemberError = true;
                         }
                     }
@@ -40433,17 +51320,18 @@ var ts;
             };
             for (var _i = 0, _a = node.members; _i < _a.length; _i++) {
                 var member = _a[_i];
-                _loop_8(member);
+                _loop_6(member);
             }
             if (!issuedMemberError) {
+                // check again with diagnostics to generate a less-specific error
                 checkTypeAssignableTo(typeWithThis, baseWithThis, node.name || node, broadDiag);
             }
         }
         function checkBaseTypeAccessibility(type, node) {
-            var signatures = getSignaturesOfType(type, 1);
+            var signatures = getSignaturesOfType(type, 1 /* Construct */);
             if (signatures.length) {
                 var declaration = signatures[0].declaration;
-                if (declaration && ts.hasModifier(declaration, 8)) {
+                if (declaration && ts.hasModifier(declaration, 8 /* Private */)) {
                     var typeClassDeclaration = ts.getClassLikeDeclarationOfSymbol(type.symbol);
                     if (!isNodeWithinClass(node, typeClassDeclaration)) {
                         error(node, ts.Diagnostics.Cannot_extend_a_class_0_Class_constructor_is_marked_as_private, getFullyQualifiedName(type.symbol));
@@ -40452,29 +51340,52 @@ var ts;
             }
         }
         function getTargetSymbol(s) {
-            return ts.getCheckFlags(s) & 1 ? s.target : s;
+            // if symbol is instantiated its flags are not copied from the 'target'
+            // so we'll need to get back original 'target' symbol to work with correct set of flags
+            return ts.getCheckFlags(s) & 1 /* Instantiated */ ? s.target : s;
         }
         function getClassOrInterfaceDeclarationsOfSymbol(symbol) {
             return ts.filter(symbol.declarations, function (d) {
-                return d.kind === 235 || d.kind === 236;
+                return d.kind === 235 /* ClassDeclaration */ || d.kind === 236 /* InterfaceDeclaration */;
             });
         }
         function checkKindsOfPropertyMemberOverrides(type, baseType) {
+            // TypeScript 1.0 spec (April 2014): 8.2.3
+            // A derived class inherits all members from its base class it doesn't override.
+            // Inheritance means that a derived class implicitly contains all non - overridden members of the base class.
+            // Both public and private property members are inherited, but only public property members can be overridden.
+            // A property member in a derived class is said to override a property member in a base class
+            // when the derived class property member has the same name and kind(instance or static)
+            // as the base class property member.
+            // The type of an overriding property member must be assignable(section 3.8.4)
+            // to the type of the overridden property member, or otherwise a compile - time error occurs.
+            // Base class instance member functions can be overridden by derived class instance member functions,
+            // but not by other kinds of members.
+            // Base class instance member variables and accessors can be overridden by
+            // derived class instance member variables and accessors, but not by other kinds of members.
+            // NOTE: assignability is checked in checkClassDeclaration
             var baseProperties = getPropertiesOfType(baseType);
             for (var _i = 0, baseProperties_1 = baseProperties; _i < baseProperties_1.length; _i++) {
                 var baseProperty = baseProperties_1[_i];
                 var base = getTargetSymbol(baseProperty);
-                if (base.flags & 4194304) {
+                if (base.flags & 4194304 /* Prototype */) {
                     continue;
                 }
-                var derived = getTargetSymbol(getPropertyOfObjectType(type, base.escapedName));
+                var derived = getTargetSymbol(getPropertyOfObjectType(type, base.escapedName)); // TODO: GH#18217
                 var baseDeclarationFlags = ts.getDeclarationModifierFlagsFromSymbol(base);
                 ts.Debug.assert(!!derived, "derived should point to something, even if it is the base class' declaration.");
                 if (derived) {
+                    // In order to resolve whether the inherited method was overridden in the base class or not,
+                    // we compare the Symbols obtained. Since getTargetSymbol returns the symbol on the *uninstantiated*
+                    // type declaration, derived and base resolve to the same symbol even in the case of generic classes.
                     if (derived === base) {
+                        // derived class inherits base without override/redeclaration
                         var derivedClassDecl = ts.getClassLikeDeclarationOfSymbol(type.symbol);
-                        if (baseDeclarationFlags & 128 && (!derivedClassDecl || !ts.hasModifier(derivedClassDecl, 128))) {
-                            if (derivedClassDecl.kind === 205) {
+                        // It is an error to inherit an abstract member without implementing it or being declared abstract.
+                        // If there is no declaration for the derived class (as in the case of class expressions),
+                        // then the class cannot be declared abstract.
+                        if (baseDeclarationFlags & 128 /* Abstract */ && (!derivedClassDecl || !ts.hasModifier(derivedClassDecl, 128 /* Abstract */))) {
+                            if (derivedClassDecl.kind === 205 /* ClassExpression */) {
                                 error(derivedClassDecl, ts.Diagnostics.Non_abstract_class_expression_does_not_implement_inherited_abstract_member_0_from_class_1, symbolToString(baseProperty), typeToString(baseType));
                             }
                             else {
@@ -40483,23 +51394,26 @@ var ts;
                         }
                     }
                     else {
+                        // derived overrides base.
                         var derivedDeclarationFlags = ts.getDeclarationModifierFlagsFromSymbol(derived);
-                        if (baseDeclarationFlags & 8 || derivedDeclarationFlags & 8) {
+                        if (baseDeclarationFlags & 8 /* Private */ || derivedDeclarationFlags & 8 /* Private */) {
+                            // either base or derived property is private - not override, skip it
                             continue;
                         }
-                        if (isPrototypeProperty(base) || base.flags & 98308 && derived.flags & 98308) {
+                        if (isPrototypeProperty(base) || base.flags & 98308 /* PropertyOrAccessor */ && derived.flags & 98308 /* PropertyOrAccessor */) {
+                            // method is overridden with method or property/accessor is overridden with property/accessor - correct case
                             continue;
                         }
                         var errorMessage = void 0;
                         if (isPrototypeProperty(base)) {
-                            if (derived.flags & 98304) {
+                            if (derived.flags & 98304 /* Accessor */) {
                                 errorMessage = ts.Diagnostics.Class_0_defines_instance_member_function_1_but_extended_class_2_defines_it_as_instance_member_accessor;
                             }
                             else {
                                 errorMessage = ts.Diagnostics.Class_0_defines_instance_member_function_1_but_extended_class_2_defines_it_as_instance_member_property;
                             }
                         }
-                        else if (base.flags & 98304) {
+                        else if (base.flags & 98304 /* Accessor */) {
                             errorMessage = ts.Diagnostics.Class_0_defines_instance_member_accessor_1_but_extended_class_2_defines_it_as_instance_member_function;
                         }
                         else {
@@ -40533,7 +51447,7 @@ var ts;
                             ok = false;
                             var typeName1 = typeToString(existing.containingType);
                             var typeName2 = typeToString(base);
-                            var errorInfo = ts.chainDiagnosticMessages(undefined, ts.Diagnostics.Named_property_0_of_types_1_and_2_are_not_identical, symbolToString(prop), typeName1, typeName2);
+                            var errorInfo = ts.chainDiagnosticMessages(/*details*/ undefined, ts.Diagnostics.Named_property_0_of_types_1_and_2_are_not_identical, symbolToString(prop), typeName1, typeName2);
                             errorInfo = ts.chainDiagnosticMessages(errorInfo, ts.Diagnostics.Interface_0_cannot_simultaneously_extend_types_1_and_2, typeToString(type), typeName1, typeName2);
                             diagnostics.add(ts.createDiagnosticForNodeFromMessageChain(typeNode, errorInfo));
                         }
@@ -40543,7 +51457,7 @@ var ts;
             return ok;
         }
         function checkPropertyInitialization(node) {
-            if (!strictNullChecks || !strictPropertyInitialization || node.flags & 4194304) {
+            if (!strictNullChecks || !strictPropertyInitialization || node.flags & 4194304 /* Ambient */) {
                 return;
             }
             var constructor = findConstructorDeclaration(node);
@@ -40553,7 +51467,7 @@ var ts;
                     var propName = member.name;
                     if (ts.isIdentifier(propName)) {
                         var type = getTypeOfSymbol(getSymbolOfNode(member));
-                        if (!(type.flags & 3 || getFalsyFlags(type) & 8192)) {
+                        if (!(type.flags & 3 /* AnyOrUnknown */ || getFalsyFlags(type) & 8192 /* Undefined */)) {
                             if (!constructor || !isPropertyInitializedInConstructor(propName, type, constructor)) {
                                 error(member.name, ts.Diagnostics.Property_0_has_no_initializer_and_is_not_definitely_assigned_in_the_constructor, ts.declarationNameToString(propName));
                             }
@@ -40563,8 +51477,8 @@ var ts;
             }
         }
         function isInstancePropertyWithoutInitializer(node) {
-            return node.kind === 152 &&
-                !ts.hasModifier(node, 32 | 128) &&
+            return node.kind === 152 /* PropertyDeclaration */ &&
+                !ts.hasModifier(node, 32 /* Static */ | 128 /* Abstract */) &&
                 !node.exclamationToken &&
                 !node.initializer;
         }
@@ -40572,9 +51486,10 @@ var ts;
             var reference = ts.createPropertyAccess(ts.createThis(), propName);
             reference.flowNode = constructor.returnFlowNode;
             var flowType = getFlowTypeOfReference(reference, propType, getOptionalType(propType));
-            return !(getFalsyFlags(flowType) & 8192);
+            return !(getFalsyFlags(flowType) & 8192 /* Undefined */);
         }
         function checkInterfaceDeclaration(node) {
+            // Grammar checking
             if (!checkGrammarDecoratorsAndModifiers(node))
                 checkGrammarInterfaceDeclaration(node);
             checkTypeParameters(node.typeParameters);
@@ -40583,10 +51498,12 @@ var ts;
                 checkExportsOnMergedDeclarations(node);
                 var symbol = getSymbolOfNode(node);
                 checkTypeParameterListsIdentical(symbol);
-                var firstInterfaceDecl = ts.getDeclarationOfKind(symbol, 236);
+                // Only check this symbol once
+                var firstInterfaceDecl = ts.getDeclarationOfKind(symbol, 236 /* InterfaceDeclaration */);
                 if (node === firstInterfaceDecl) {
                     var type = getDeclaredTypeOfSymbol(symbol);
                     var typeWithThis = getTypeWithThisArgument(type);
+                    // run subsequent checks only if first set succeeded
                     if (checkInheritedPropertiesAreIdentical(type, node.name)) {
                         for (var _i = 0, _a = getBaseTypes(type); _i < _a.length; _i++) {
                             var baseType = _a[_i];
@@ -40610,6 +51527,7 @@ var ts;
             }
         }
         function checkTypeAliasDeclaration(node) {
+            // Grammar checking
             checkGrammarDecoratorsAndModifiers(node);
             checkTypeNameIsReserved(node.name, ts.Diagnostics.Type_alias_name_cannot_be_0);
             checkTypeParameters(node.typeParameters);
@@ -40618,8 +51536,8 @@ var ts;
         }
         function computeEnumMemberValues(node) {
             var nodeLinks = getNodeLinks(node);
-            if (!(nodeLinks.flags & 16384)) {
-                nodeLinks.flags |= 16384;
+            if (!(nodeLinks.flags & 16384 /* EnumValuesComputed */)) {
+                nodeLinks.flags |= 16384 /* EnumValuesComputed */;
                 var autoValue = 0;
                 for (var _i = 0, _a = node.members; _i < _a.length; _i++) {
                     var member = _a[_i];
@@ -40642,9 +51560,15 @@ var ts;
             if (member.initializer) {
                 return computeConstantValue(member);
             }
-            if (member.parent.flags & 4194304 && !ts.isConst(member.parent)) {
+            // In ambient enum declarations that specify no const modifier, enum member declarations that omit
+            // a value are considered computed members (as opposed to having auto-incremented values).
+            if (member.parent.flags & 4194304 /* Ambient */ && !ts.isConst(member.parent)) {
                 return undefined;
             }
+            // If the member declaration specifies no value, the member is considered a constant enum member.
+            // If the member is the first member in the enum declaration, it is assigned the value zero.
+            // Otherwise, it is assigned the value of the immediately preceding member plus one, and an error
+            // occurs if the immediately preceding member is not a constant enum member.
             if (autoValue !== undefined) {
                 return autoValue;
             }
@@ -40655,7 +51579,7 @@ var ts;
             var enumKind = getEnumKind(getSymbolOfNode(member.parent));
             var isConstEnum = ts.isConst(member.parent);
             var initializer = member.initializer;
-            var value = enumKind === 1 && !isLiteralEnumMember(member) ? undefined : evaluate(initializer);
+            var value = enumKind === 1 /* Literal */ && !isLiteralEnumMember(member) ? undefined : evaluate(initializer);
             if (value !== undefined) {
                 if (isConstEnum && typeof value === "number" && !isFinite(value)) {
                     error(initializer, isNaN(value) ?
@@ -40663,76 +51587,77 @@ var ts;
                         ts.Diagnostics.const_enum_member_initializer_was_evaluated_to_a_non_finite_value);
                 }
             }
-            else if (enumKind === 1) {
+            else if (enumKind === 1 /* Literal */) {
                 error(initializer, ts.Diagnostics.Computed_values_are_not_permitted_in_an_enum_with_string_valued_members);
                 return 0;
             }
             else if (isConstEnum) {
                 error(initializer, ts.Diagnostics.In_const_enum_declarations_member_initializer_must_be_constant_expression);
             }
-            else if (member.parent.flags & 4194304) {
+            else if (member.parent.flags & 4194304 /* Ambient */) {
                 error(initializer, ts.Diagnostics.In_ambient_enum_declarations_member_initializer_must_be_constant_expression);
             }
             else {
-                checkTypeAssignableTo(checkExpression(initializer), getDeclaredTypeOfSymbol(getSymbolOfNode(member.parent)), initializer, undefined);
+                // Only here do we need to check that the initializer is assignable to the enum type.
+                checkTypeAssignableTo(checkExpression(initializer), getDeclaredTypeOfSymbol(getSymbolOfNode(member.parent)), initializer, /*headMessage*/ undefined);
             }
             return value;
             function evaluate(expr) {
                 switch (expr.kind) {
-                    case 198:
-                        var value_2 = evaluate(expr.operand);
-                        if (typeof value_2 === "number") {
+                    case 198 /* PrefixUnaryExpression */:
+                        var value_1 = evaluate(expr.operand);
+                        if (typeof value_1 === "number") {
                             switch (expr.operator) {
-                                case 37: return value_2;
-                                case 38: return -value_2;
-                                case 52: return ~value_2;
+                                case 37 /* PlusToken */: return value_1;
+                                case 38 /* MinusToken */: return -value_1;
+                                case 52 /* TildeToken */: return ~value_1;
                             }
                         }
                         break;
-                    case 200:
+                    case 200 /* BinaryExpression */:
                         var left = evaluate(expr.left);
                         var right = evaluate(expr.right);
                         if (typeof left === "number" && typeof right === "number") {
                             switch (expr.operatorToken.kind) {
-                                case 49: return left | right;
-                                case 48: return left & right;
-                                case 46: return left >> right;
-                                case 47: return left >>> right;
-                                case 45: return left << right;
-                                case 50: return left ^ right;
-                                case 39: return left * right;
-                                case 41: return left / right;
-                                case 37: return left + right;
-                                case 38: return left - right;
-                                case 42: return left % right;
-                                case 40: return Math.pow(left, right);
+                                case 49 /* BarToken */: return left | right;
+                                case 48 /* AmpersandToken */: return left & right;
+                                case 46 /* GreaterThanGreaterThanToken */: return left >> right;
+                                case 47 /* GreaterThanGreaterThanGreaterThanToken */: return left >>> right;
+                                case 45 /* LessThanLessThanToken */: return left << right;
+                                case 50 /* CaretToken */: return left ^ right;
+                                case 39 /* AsteriskToken */: return left * right;
+                                case 41 /* SlashToken */: return left / right;
+                                case 37 /* PlusToken */: return left + right;
+                                case 38 /* MinusToken */: return left - right;
+                                case 42 /* PercentToken */: return left % right;
+                                case 40 /* AsteriskAsteriskToken */: return Math.pow(left, right);
                             }
                         }
-                        else if (typeof left === "string" && typeof right === "string" && expr.operatorToken.kind === 37) {
+                        else if (typeof left === "string" && typeof right === "string" && expr.operatorToken.kind === 37 /* PlusToken */) {
                             return left + right;
                         }
                         break;
-                    case 9:
+                    case 9 /* StringLiteral */:
                         return expr.text;
-                    case 8:
+                    case 8 /* NumericLiteral */:
                         checkGrammarNumericLiteral(expr);
                         return +expr.text;
-                    case 191:
+                    case 191 /* ParenthesizedExpression */:
                         return evaluate(expr.expression);
-                    case 71:
+                    case 71 /* Identifier */:
                         var identifier = expr;
                         if (isInfinityOrNaNString(identifier.escapedText)) {
                             return +(identifier.escapedText);
                         }
                         return ts.nodeIsMissing(expr) ? 0 : evaluateEnumMember(expr, getSymbolOfNode(member.parent), identifier.escapedText);
-                    case 186:
-                    case 185:
+                    case 186 /* ElementAccessExpression */:
+                    case 185 /* PropertyAccessExpression */:
                         var ex = expr;
                         if (isConstantMemberAccess(ex)) {
                             var type = getTypeOfExpression(ex.expression);
-                            if (type.symbol && type.symbol.flags & 384) {
+                            if (type.symbol && type.symbol.flags & 384 /* Enum */) {
                                 var name = void 0;
-                                if (ex.kind === 185) {
+                                if (ex.kind === 185 /* PropertyAccessExpression */) {
                                     name = ex.name.escapedText;
                                 }
                                 else {
@@ -40763,15 +51688,16 @@ var ts;
             }
         }
         function isConstantMemberAccess(node) {
-            return node.kind === 71 ||
-                node.kind === 185 && isConstantMemberAccess(node.expression) ||
-                node.kind === 186 && isConstantMemberAccess(node.expression) &&
-                    node.argumentExpression.kind === 9;
+            return node.kind === 71 /* Identifier */ ||
+                node.kind === 185 /* PropertyAccessExpression */ && isConstantMemberAccess(node.expression) ||
+                node.kind === 186 /* ElementAccessExpression */ && isConstantMemberAccess(node.expression) &&
+                    node.argumentExpression.kind === 9 /* StringLiteral */;
         }
         function checkEnumDeclaration(node) {
             if (!produceDiagnostics) {
                 return;
             }
+            // Grammar checking
             checkGrammarDecoratorsAndModifiers(node);
             checkTypeNameIsReserved(node.name, ts.Diagnostics.Enum_name_cannot_be_0);
             checkCollisionWithRequireExportsInGeneratedCode(node, node.name);
@@ -40779,13 +51705,20 @@ var ts;
             checkExportsOnMergedDeclarations(node);
             computeEnumMemberValues(node);
             var enumIsConst = ts.isConst(node);
-            if (compilerOptions.isolatedModules && enumIsConst && node.flags & 4194304) {
+            if (compilerOptions.isolatedModules && enumIsConst && node.flags & 4194304 /* Ambient */) {
                 error(node.name, ts.Diagnostics.Ambient_const_enums_are_not_allowed_when_the_isolatedModules_flag_is_provided);
             }
+            // Spec 2014 - Section 9.3:
+            // It isn't possible for one enum declaration to continue the automatic numbering sequence of another,
+            // and when an enum type has multiple declarations, only one declaration is permitted to omit a value
+            // for the first member.
+            //
+            // Only perform this check once per symbol
             var enumSymbol = getSymbolOfNode(node);
             var firstDeclaration = ts.getDeclarationOfKind(enumSymbol, node.kind);
             if (node === firstDeclaration) {
                 if (enumSymbol.declarations.length > 1) {
+                    // check that const is placed\omitted on all enum declarations
                     ts.forEach(enumSymbol.declarations, function (decl) {
                         if (ts.isConstEnumDeclaration(decl) !== enumIsConst) {
                             error(ts.getNameOfDeclaration(decl), ts.Diagnostics.Enum_declarations_must_all_be_const_or_non_const);
@@ -40794,7 +51727,8 @@ var ts;
                 }
                 var seenEnumMissingInitialInitializer_1 = false;
                 ts.forEach(enumSymbol.declarations, function (declaration) {
-                    if (declaration.kind !== 238) {
+                    // return true if we hit a violation of the rule, false otherwise
+                    if (declaration.kind !== 238 /* EnumDeclaration */) {
                         return false;
                     }
                     var enumDeclaration = declaration;
@@ -40815,11 +51749,11 @@ var ts;
         }
         function getFirstNonAmbientClassOrFunctionDeclaration(symbol) {
             var declarations = symbol.declarations;
-            for (var _i = 0, declarations_8 = declarations; _i < declarations_8.length; _i++) {
-                var declaration = declarations_8[_i];
-                if ((declaration.kind === 235 ||
-                    (declaration.kind === 234 && ts.nodeIsPresent(declaration.body))) &&
-                    !(declaration.flags & 4194304)) {
+            for (var _i = 0, declarations_7 = declarations; _i < declarations_7.length; _i++) {
+                var declaration = declarations_7[_i];
+                if ((declaration.kind === 235 /* ClassDeclaration */ ||
+                    (declaration.kind === 234 /* FunctionDeclaration */ && ts.nodeIsPresent(declaration.body))) &&
+                    !(declaration.flags & 4194304 /* Ambient */)) {
                     return declaration;
                 }
             }
@@ -40840,8 +51774,9 @@ var ts;
         }
         function checkModuleDeclaration(node) {
             if (produceDiagnostics) {
+                // Grammar checking
                 var isGlobalAugmentation = ts.isGlobalScopeAugmentation(node);
-                var inAmbientContext = node.flags & 4194304;
+                var inAmbientContext = node.flags & 4194304 /* Ambient */;
                 if (isGlobalAugmentation && !inAmbientContext) {
                     error(node.name, ts.Diagnostics.Augmentations_for_the_global_scope_should_have_declare_modifier_unless_they_appear_in_already_ambient_context);
                 }
@@ -40850,10 +51785,11 @@ var ts;
                     ? ts.Diagnostics.An_ambient_module_declaration_is_only_allowed_at_the_top_level_in_a_file
                     : ts.Diagnostics.A_namespace_declaration_is_only_allowed_in_a_namespace_or_module;
                 if (checkGrammarModuleElementContext(node, contextErrorMessage)) {
+                    // If we hit a module declaration in an illegal context, just bail out to avoid cascading errors.
                     return;
                 }
                 if (!checkGrammarDecoratorsAndModifiers(node)) {
-                    if (!inAmbientContext && node.name.kind === 9) {
+                    if (!inAmbientContext && node.name.kind === 9 /* StringLiteral */) {
                         grammarErrorOnNode(node.name, ts.Diagnostics.Only_ambient_modules_can_use_quoted_names);
                     }
                 }
@@ -40863,7 +51799,8 @@ var ts;
                 }
                 checkExportsOnMergedDeclarations(node);
                 var symbol = getSymbolOfNode(node);
-                if (symbol.flags & 512
+                // The following checks only apply on a non-ambient instantiated module declaration.
+                if (symbol.flags & 512 /* ValueModule */
                     && symbol.declarations.length > 1
                     && !inAmbientContext
                     && isInstantiatedModule(node, !!compilerOptions.preserveConstEnums || !!compilerOptions.isolatedModules)) {
@@ -40876,15 +51813,22 @@ var ts;
                             error(node.name, ts.Diagnostics.A_namespace_declaration_cannot_be_located_prior_to_a_class_or_function_with_which_it_is_merged);
                         }
                     }
-                    var mergedClass = ts.getDeclarationOfKind(symbol, 235);
+                    // if the module merges with a class declaration in the same lexical scope,
+                    // we need to track this to ensure the correct emit.
+                    var mergedClass = ts.getDeclarationOfKind(symbol, 235 /* ClassDeclaration */);
                     if (mergedClass &&
                         inSameLexicalScope(node, mergedClass)) {
-                        getNodeLinks(node).flags |= 32768;
+                        getNodeLinks(node).flags |= 32768 /* LexicalModuleMergesWithClass */;
                     }
                 }
                 if (isAmbientExternalModule) {
                     if (ts.isExternalModuleAugmentation(node)) {
-                        var checkBody = isGlobalAugmentation || (getSymbolOfNode(node).flags & 33554432);
+                        // body of the augmentation should be checked for consistency only if augmentation was applied to its target (either global scope or module)
+                        // otherwise we'll be swamped in cascading errors.
+                        // We can detect if augmentation was applied using following rules:
+                        // - augmentation for a global scope is always applied
+                        // - augmentation for some external module is applied if symbol for augmentation is merged (it was combined with target module).
+                        var checkBody = isGlobalAugmentation || (getSymbolOfNode(node).flags & 33554432 /* Transient */);
                         if (checkBody && node.body) {
                             for (var _i = 0, _a = node.body.statements; _i < _a.length; _i++) {
                                 var statement = _a[_i];
@@ -40905,6 +51849,8 @@ var ts;
                             error(node.name, ts.Diagnostics.Augmentations_for_the_global_scope_can_only_be_directly_nested_in_external_modules_or_ambient_module_declarations);
                         }
                         else {
+                            // Node is not an augmentation and is not located on the script level.
+                            // This means that this is declaration of ambient module that is located in other module or namespace which is prohibited.
                             error(node.name, ts.Diagnostics.Ambient_modules_cannot_be_nested_in_other_modules_or_namespaces);
                         }
                     }
@@ -40919,43 +51865,51 @@ var ts;
         }
         function checkModuleAugmentationElement(node, isGlobalAugmentation) {
             switch (node.kind) {
-                case 214:
+                case 214 /* VariableStatement */:
+                    // error each individual name in variable statement instead of marking the entire variable statement
                     for (var _i = 0, _a = node.declarationList.declarations; _i < _a.length; _i++) {
                         var decl = _a[_i];
                         checkModuleAugmentationElement(decl, isGlobalAugmentation);
                     }
                     break;
-                case 249:
-                case 250:
+                case 249 /* ExportAssignment */:
+                case 250 /* ExportDeclaration */:
                     grammarErrorOnFirstToken(node, ts.Diagnostics.Exports_and_export_assignments_are_not_permitted_in_module_augmentations);
                     break;
-                case 243:
-                case 244:
+                case 243 /* ImportEqualsDeclaration */:
+                case 244 /* ImportDeclaration */:
                     grammarErrorOnFirstToken(node, ts.Diagnostics.Imports_are_not_permitted_in_module_augmentations_Consider_moving_them_to_the_enclosing_external_module);
                     break;
-                case 182:
-                case 232:
+                case 182 /* BindingElement */:
+                case 232 /* VariableDeclaration */:
                     var name = node.name;
                     if (ts.isBindingPattern(name)) {
                         for (var _b = 0, _c = name.elements; _b < _c.length; _b++) {
                             var el = _c[_b];
+                            // mark individual names in binding pattern
                             checkModuleAugmentationElement(el, isGlobalAugmentation);
                         }
                         break;
                     }
-                case 235:
-                case 238:
-                case 234:
-                case 236:
-                case 239:
-                case 237:
+                // falls through
+                case 235 /* ClassDeclaration */:
+                case 238 /* EnumDeclaration */:
+                case 234 /* FunctionDeclaration */:
+                case 236 /* InterfaceDeclaration */:
+                case 239 /* ModuleDeclaration */:
+                case 237 /* TypeAliasDeclaration */:
                     if (isGlobalAugmentation) {
                         return;
                     }
                     var symbol = getSymbolOfNode(node);
                     if (symbol) {
-                        var reportError = !(symbol.flags & 33554432);
+                        // module augmentations cannot introduce new names on the top level scope of the module
+                        // this is done it two steps
+                        // 1. quick check - if symbol for node is not merged - this is local symbol to this augmentation - report error
+                        // 2. main check - report error if value declaration of the parent symbol is module augmentation)
+                        var reportError = !(symbol.flags & 33554432 /* Transient */);
                         if (!reportError) {
+                            // symbol should not originate in augmentation
                             reportError = ts.isExternalModuleAugmentation(symbol.parent.declarations[0]);
                         }
                     }
@@ -40964,38 +51918,45 @@ var ts;
         }
         function getFirstIdentifier(node) {
             switch (node.kind) {
-                case 71:
+                case 71 /* Identifier */:
                     return node;
-                case 146:
+                case 146 /* QualifiedName */:
                     do {
                         node = node.left;
-                    } while (node.kind !== 71);
+                    } while (node.kind !== 71 /* Identifier */);
                     return node;
-                case 185:
+                case 185 /* PropertyAccessExpression */:
                     do {
                         node = node.expression;
-                    } while (node.kind !== 71);
+                    } while (node.kind !== 71 /* Identifier */);
                     return node;
             }
         }
         function checkExternalImportOrExportDeclaration(node) {
             var moduleName = ts.getExternalModuleName(node);
             if (!moduleName || ts.nodeIsMissing(moduleName)) {
+                // Should be a parse error.
                 return false;
             }
             if (!ts.isStringLiteral(moduleName)) {
                 error(moduleName, ts.Diagnostics.String_literal_expected);
                 return false;
             }
-            var inAmbientExternalModule = node.parent.kind === 240 && ts.isAmbientModule(node.parent.parent);
-            if (node.parent.kind !== 274 && !inAmbientExternalModule) {
-                error(moduleName, node.kind === 250 ?
+            var inAmbientExternalModule = node.parent.kind === 240 /* ModuleBlock */ && ts.isAmbientModule(node.parent.parent);
+            if (node.parent.kind !== 274 /* SourceFile */ && !inAmbientExternalModule) {
+                error(moduleName, node.kind === 250 /* ExportDeclaration */ ?
                     ts.Diagnostics.Export_declarations_are_not_permitted_in_a_namespace :
                     ts.Diagnostics.Import_declarations_in_a_namespace_cannot_reference_a_module);
                 return false;
             }
             if (inAmbientExternalModule && ts.isExternalModuleNameRelative(moduleName.text)) {
+                // we have already reported errors on top level imports\exports in external module augmentations in checkModuleDeclaration
+                // no need to do this again.
                 if (!isTopLevelInExternalModuleAugmentation(node)) {
+                    // TypeScript 1.0 spec (April 2013): 12.1.6
+                    // An ExternalImportDeclaration in an AmbientExternalModuleDeclaration may reference
+                    // other external modules only through top - level external module names.
+                    // Relative external module names are not permitted.
                     error(node, ts.Diagnostics.Import_or_export_declaration_in_an_ambient_module_declaration_cannot_reference_module_through_relative_module_name);
                     return false;
                 }
@@ -41006,19 +51967,26 @@ var ts;
             var symbol = getSymbolOfNode(node);
             var target = resolveAlias(symbol);
             if (target !== unknownSymbol) {
-                var excludedMeanings = (symbol.flags & (67216319 | 1048576) ? 67216319 : 0) |
-                    (symbol.flags & 67901928 ? 67901928 : 0) |
-                    (symbol.flags & 1920 ? 1920 : 0);
+                // For external modules symbol represent local symbol for an alias.
+                // This local symbol will merge any other local declarations (excluding other aliases)
+                // and symbol.flags will contains combined representation for all merged declaration.
+                // Based on symbol.flags we can compute a set of excluded meanings (meaning that resolved alias should not have,
+                // otherwise it will conflict with some local declaration). Note that in addition to normal flags we include matching SymbolFlags.Export*
+                // in order to prevent collisions with declarations that were exported from the current module (they still contribute to local names).
+                var excludedMeanings = (symbol.flags & (67216319 /* Value */ | 1048576 /* ExportValue */) ? 67216319 /* Value */ : 0) |
+                    (symbol.flags & 67901928 /* Type */ ? 67901928 /* Type */ : 0) |
+                    (symbol.flags & 1920 /* Namespace */ ? 1920 /* Namespace */ : 0);
                 if (target.flags & excludedMeanings) {
-                    var message = node.kind === 252 ?
+                    var message = node.kind === 252 /* ExportSpecifier */ ?
                         ts.Diagnostics.Export_declaration_conflicts_with_exported_declaration_of_0 :
                         ts.Diagnostics.Import_declaration_conflicts_with_local_declaration_of_0;
                     error(node, message, symbolToString(symbol));
                 }
+                // Don't allow to re-export something with no value side when `--isolatedModules` is set.
                 if (compilerOptions.isolatedModules
-                    && node.kind === 252
-                    && !(target.flags & 67216319)
-                    && !(node.flags & 4194304)) {
+                    && node.kind === 252 /* ExportSpecifier */
+                    && !(target.flags & 67216319 /* Value */)
+                    && !(node.flags & 4194304 /* Ambient */)) {
                     error(node, ts.Diagnostics.Cannot_re_export_a_type_when_the_isolatedModules_flag_is_provided);
                 }
             }
@@ -41030,6 +51998,7 @@ var ts;
         }
         function checkImportDeclaration(node) {
             if (checkGrammarModuleElementContext(node, ts.Diagnostics.An_import_declaration_can_only_be_used_in_a_namespace_or_module)) {
+                // If we hit an import declaration in an illegal context, just bail out to avoid cascading errors.
                 return;
             }
             if (!checkGrammarDecoratorsAndModifiers(node) && ts.hasModifiers(node)) {
@@ -41042,7 +52011,7 @@ var ts;
                         checkImportBinding(importClause);
                     }
                     if (importClause.namedBindings) {
-                        if (importClause.namedBindings.kind === 246) {
+                        if (importClause.namedBindings.kind === 246 /* NamespaceImport */) {
                             checkImportBinding(importClause.namedBindings);
                         }
                         else {
@@ -41057,30 +52026,33 @@ var ts;
         }
         function checkImportEqualsDeclaration(node) {
             if (checkGrammarModuleElementContext(node, ts.Diagnostics.An_import_declaration_can_only_be_used_in_a_namespace_or_module)) {
+                // If we hit an import declaration in an illegal context, just bail out to avoid cascading errors.
                 return;
             }
             checkGrammarDecoratorsAndModifiers(node);
             if (ts.isInternalModuleImportEqualsDeclaration(node) || checkExternalImportOrExportDeclaration(node)) {
                 checkImportBinding(node);
-                if (ts.hasModifier(node, 1)) {
+                if (ts.hasModifier(node, 1 /* Export */)) {
                     markExportAsReferenced(node);
                 }
-                if (node.moduleReference.kind !== 254) {
+                if (node.moduleReference.kind !== 254 /* ExternalModuleReference */) {
                     var target = resolveAlias(getSymbolOfNode(node));
                     if (target !== unknownSymbol) {
-                        if (target.flags & 67216319) {
+                        if (target.flags & 67216319 /* Value */) {
+                            // Target is a value symbol, check that it is not hidden by a local declaration with the same name
                             var moduleName = getFirstIdentifier(node.moduleReference);
-                            if (!(resolveEntityName(moduleName, 67216319 | 1920).flags & 1920)) {
+                            if (!(resolveEntityName(moduleName, 67216319 /* Value */ | 1920 /* Namespace */).flags & 1920 /* Namespace */)) {
                                 error(moduleName, ts.Diagnostics.Module_0_is_hidden_by_a_local_declaration_with_the_same_name, ts.declarationNameToString(moduleName));
                             }
                         }
-                        if (target.flags & 67901928) {
+                        if (target.flags & 67901928 /* Type */) {
                             checkTypeNameIsReserved(node.name, ts.Diagnostics.Import_name_cannot_be_0);
                         }
                     }
                 }
                 else {
-                    if (moduleKind >= ts.ModuleKind.ES2015 && !(node.flags & 4194304)) {
+                    if (moduleKind >= ts.ModuleKind.ES2015 && !(node.flags & 4194304 /* Ambient */)) {
+                        // Import equals declaration is deprecated in es6 or above
                         grammarErrorOnNode(node, ts.Diagnostics.Import_assignment_cannot_be_used_when_targeting_ECMAScript_modules_Consider_using_import_Asterisk_as_ns_from_mod_import_a_from_mod_import_d_from_mod_or_another_module_format_instead);
                     }
                 }
@@ -41088,6 +52060,7 @@ var ts;
         }
         function checkExportDeclaration(node) {
             if (checkGrammarModuleElementContext(node, ts.Diagnostics.An_export_declaration_can_only_be_used_in_a_module)) {
+                // If we hit an export in an illegal context, just bail out to avoid cascading errors.
                 return;
             }
             if (!checkGrammarDecoratorsAndModifiers(node) && ts.hasModifiers(node)) {
@@ -41095,27 +52068,30 @@ var ts;
             }
             if (!node.moduleSpecifier || checkExternalImportOrExportDeclaration(node)) {
                 if (node.exportClause) {
+                    // export { x, y }
+                    // export { x, y } from "foo"
                     ts.forEach(node.exportClause.elements, checkExportSpecifier);
-                    var inAmbientExternalModule = node.parent.kind === 240 && ts.isAmbientModule(node.parent.parent);
-                    var inAmbientNamespaceDeclaration = !inAmbientExternalModule && node.parent.kind === 240 &&
-                        !node.moduleSpecifier && node.flags & 4194304;
-                    if (node.parent.kind !== 274 && !inAmbientExternalModule && !inAmbientNamespaceDeclaration) {
+                    var inAmbientExternalModule = node.parent.kind === 240 /* ModuleBlock */ && ts.isAmbientModule(node.parent.parent);
+                    var inAmbientNamespaceDeclaration = !inAmbientExternalModule && node.parent.kind === 240 /* ModuleBlock */ &&
+                        !node.moduleSpecifier && node.flags & 4194304 /* Ambient */;
+                    if (node.parent.kind !== 274 /* SourceFile */ && !inAmbientExternalModule && !inAmbientNamespaceDeclaration) {
                         error(node, ts.Diagnostics.Export_declarations_are_not_permitted_in_a_namespace);
                     }
                 }
                 else {
+                    // export * from "foo"
                     var moduleSymbol_2 = resolveExternalModuleName(node, node.moduleSpecifier);
                     if (moduleSymbol_2 && hasExportAssignmentSymbol(moduleSymbol_2)) {
                         error(node.moduleSpecifier, ts.Diagnostics.Module_0_uses_export_and_cannot_be_used_with_export_Asterisk, symbolToString(moduleSymbol_2));
                     }
                     if (moduleKind !== ts.ModuleKind.System && moduleKind !== ts.ModuleKind.ES2015 && moduleKind !== ts.ModuleKind.ESNext) {
-                        checkExternalEmitHelpers(node, 32768);
+                        checkExternalEmitHelpers(node, 32768 /* ExportStar */);
                     }
                 }
             }
         }
         function checkGrammarModuleElementContext(node, errorMessage) {
-            var isInAppropriateContext = node.parent.kind === 274 || node.parent.kind === 240 || node.parent.kind === 239;
+            var isInAppropriateContext = node.parent.kind === 274 /* SourceFile */ || node.parent.kind === 240 /* ModuleBlock */ || node.parent.kind === 239 /* ModuleDeclaration */;
             if (!isInAppropriateContext) {
                 grammarErrorOnFirstToken(node, errorMessage);
             }
@@ -41124,11 +52100,13 @@ var ts;
         function checkExportSpecifier(node) {
             checkAliasSymbol(node);
             if (compilerOptions.declaration) {
-                collectLinkedAliases(node.propertyName || node.name, true);
+                collectLinkedAliases(node.propertyName || node.name, /*setVisibility*/ true);
             }
             if (!node.parent.parent.moduleSpecifier) {
                 var exportedName = node.propertyName || node.name;
-                var symbol = resolveName(exportedName, exportedName.escapedText, 67216319 | 67901928 | 1920 | 2097152, undefined, undefined, true);
+                // find immediate value referenced by exported name (SymbolFlags.Alias is set so we don't chase down aliases)
+                var symbol = resolveName(exportedName, exportedName.escapedText, 67216319 /* Value */ | 67901928 /* Type */ | 1920 /* Namespace */ | 2097152 /* Alias */, 
+                /*nameNotFoundMessage*/ undefined, /*nameArg*/ undefined, /*isUse*/ true);
                 if (symbol && (symbol === undefinedSymbol || isGlobalSourceFile(getDeclarationContainer(symbol.declarations[0])))) {
                     error(exportedName, ts.Diagnostics.Cannot_export_0_Only_local_declarations_can_be_exported_from_a_module, ts.idText(exportedName));
                 }
@@ -41139,10 +52117,11 @@ var ts;
         }
         function checkExportAssignment(node) {
             if (checkGrammarModuleElementContext(node, ts.Diagnostics.An_export_assignment_can_only_be_used_in_a_module)) {
+                // If we hit an export assignment in an illegal context, just bail out to avoid cascading errors.
                 return;
             }
-            var container = node.parent.kind === 274 ? node.parent : node.parent.parent;
-            if (container.kind === 239 && !ts.isAmbientModule(container)) {
+            var container = node.parent.kind === 274 /* SourceFile */ ? node.parent : node.parent.parent;
+            if (container.kind === 239 /* ModuleDeclaration */ && !ts.isAmbientModule(container)) {
                 if (node.isExportEquals) {
                     error(node, ts.Diagnostics.An_export_assignment_cannot_be_used_in_a_namespace);
                 }
@@ -41151,27 +52130,30 @@ var ts;
                 }
                 return;
             }
+            // Grammar checking
             if (!checkGrammarDecoratorsAndModifiers(node) && ts.hasModifiers(node)) {
                 grammarErrorOnFirstToken(node, ts.Diagnostics.An_export_assignment_cannot_have_modifiers);
             }
-            if (node.expression.kind === 71) {
+            if (node.expression.kind === 71 /* Identifier */) {
                 markExportAsReferenced(node);
                 if (compilerOptions.declaration) {
-                    collectLinkedAliases(node.expression, true);
+                    collectLinkedAliases(node.expression, /*setVisibility*/ true);
                 }
             }
             else {
                 checkExpressionCached(node.expression);
             }
             checkExternalModuleExports(container);
-            if ((node.flags & 4194304) && !ts.isEntityNameExpression(node.expression)) {
+            if ((node.flags & 4194304 /* Ambient */) && !ts.isEntityNameExpression(node.expression)) {
                 grammarErrorOnNode(node.expression, ts.Diagnostics.The_expression_of_an_export_assignment_must_be_an_identifier_or_qualified_name_in_an_ambient_context);
             }
-            if (node.isExportEquals && !(node.flags & 4194304)) {
+            if (node.isExportEquals && !(node.flags & 4194304 /* Ambient */)) {
                 if (moduleKind >= ts.ModuleKind.ES2015) {
+                    // export assignment is not supported in es6 modules
                     grammarErrorOnNode(node, ts.Diagnostics.Export_assignment_cannot_be_used_when_targeting_ECMAScript_modules_Consider_using_export_default_or_another_module_format_instead);
                 }
                 else if (moduleKind === ts.ModuleKind.System) {
+                    // system modules does not support export assignment
                     grammarErrorOnNode(node, ts.Diagnostics.Export_assignment_is_not_supported_when_module_flag_is_system);
                 }
             }
@@ -41190,23 +52172,28 @@ var ts;
                         error(declaration, ts.Diagnostics.An_export_assignment_cannot_be_used_in_a_module_with_other_exported_elements);
                     }
                 }
-                var exports_1 = getExportsOfModule(moduleSymbol);
-                if (exports_1) {
-                    exports_1.forEach(function (_a, id) {
+                // Checks for export * conflicts
+                var exports = getExportsOfModule(moduleSymbol);
+                if (exports) {
+                    exports.forEach(function (_a, id) {
                         var declarations = _a.declarations, flags = _a.flags;
                         if (id === "__export") {
                             return;
                         }
-                        if (flags & (1920 | 64 | 384)) {
+                        // ECMA262: 15.2.1.1 It is a Syntax Error if the ExportedNames of ModuleItemList contains any duplicate entries.
+                        // (TS Exceptions: namespaces, function overloads, enums, and interfaces)
+                        if (flags & (1920 /* Namespace */ | 64 /* Interface */ | 384 /* Enum */)) {
                             return;
                         }
                         var exportedDeclarationsCount = ts.countWhere(declarations, isNotOverloadAndNotAccessor);
-                        if (flags & 524288 && exportedDeclarationsCount <= 2) {
+                        if (flags & 524288 /* TypeAlias */ && exportedDeclarationsCount <= 2) {
+                            // it is legal to merge type alias with other values
+                            // so count should be either 1 (just type alias) or 2 (type alias + merged value)
                             return;
                         }
                         if (exportedDeclarationsCount > 1) {
-                            for (var _i = 0, declarations_9 = declarations; _i < declarations_9.length; _i++) {
-                                var declaration = declarations_9[_i];
+                            for (var _i = 0, declarations_8 = declarations; _i < declarations_8.length; _i++) {
+                                var declaration = declarations_8[_i];
                                 if (isNotOverload(declaration)) {
                                     diagnostics.add(ts.createDiagnosticForNode(declaration, ts.Diagnostics.Cannot_redeclare_exported_variable_0, ts.unescapeLeadingUnderscores(id)));
                                 }
@@ -41218,10 +52205,11 @@ var ts;
             }
         }
         function isNotAccessor(declaration) {
+            // Accessors check for their own matching duplicates, and in contexts where they are valid, there are already duplicate identifier checks
             return !ts.isAccessor(declaration);
         }
         function isNotOverload(declaration) {
-            return (declaration.kind !== 234 && declaration.kind !== 154) ||
+            return (declaration.kind !== 234 /* FunctionDeclaration */ && declaration.kind !== 154 /* MethodDeclaration */) ||
                 !!declaration.body;
         }
         function checkSourceElement(node) {
@@ -41236,150 +52224,153 @@ var ts;
             }
             var kind = node.kind;
             if (cancellationToken) {
+                // Only bother checking on a few construct kinds.  We don't want to be excessively
+                // hitting the cancellation token on every node we check.
                 switch (kind) {
-                    case 239:
-                    case 235:
-                    case 236:
-                    case 234:
+                    case 239 /* ModuleDeclaration */:
+                    case 235 /* ClassDeclaration */:
+                    case 236 /* InterfaceDeclaration */:
+                    case 234 /* FunctionDeclaration */:
                         cancellationToken.throwIfCancellationRequested();
                 }
             }
             switch (kind) {
-                case 148:
+                case 148 /* TypeParameter */:
                     return checkTypeParameter(node);
-                case 149:
+                case 149 /* Parameter */:
                     return checkParameter(node);
-                case 152:
-                case 151:
+                case 152 /* PropertyDeclaration */:
+                case 151 /* PropertySignature */:
                     return checkPropertyDeclaration(node);
-                case 163:
-                case 164:
-                case 158:
-                case 159:
-                case 160:
+                case 163 /* FunctionType */:
+                case 164 /* ConstructorType */:
+                case 158 /* CallSignature */:
+                case 159 /* ConstructSignature */:
+                case 160 /* IndexSignature */:
                     return checkSignatureDeclaration(node);
-                case 154:
-                case 153:
+                case 154 /* MethodDeclaration */:
+                case 153 /* MethodSignature */:
                     return checkMethodDeclaration(node);
-                case 155:
+                case 155 /* Constructor */:
                     return checkConstructorDeclaration(node);
-                case 156:
-                case 157:
+                case 156 /* GetAccessor */:
+                case 157 /* SetAccessor */:
                     return checkAccessorDeclaration(node);
-                case 162:
+                case 162 /* TypeReference */:
                     return checkTypeReferenceNode(node);
-                case 161:
+                case 161 /* TypePredicate */:
                     return checkTypePredicate(node);
-                case 165:
+                case 165 /* TypeQuery */:
                     return checkTypeQuery(node);
-                case 166:
+                case 166 /* TypeLiteral */:
                     return checkTypeLiteral(node);
-                case 167:
+                case 167 /* ArrayType */:
                     return checkArrayType(node);
-                case 168:
+                case 168 /* TupleType */:
                     return checkTupleType(node);
-                case 169:
-                case 170:
+                case 169 /* UnionType */:
+                case 170 /* IntersectionType */:
                     return checkUnionOrIntersectionType(node);
-                case 173:
+                case 173 /* ParenthesizedType */:
                     return checkSourceElement(node.type);
-                case 175:
+                case 175 /* TypeOperator */:
                     return checkTypeOperator(node);
-                case 171:
+                case 171 /* ConditionalType */:
                     return checkConditionalType(node);
-                case 172:
+                case 172 /* InferType */:
                     return checkInferType(node);
-                case 179:
+                case 179 /* ImportType */:
                     return checkImportType(node);
-                case 290:
+                case 290 /* JSDocAugmentsTag */:
                     return checkJSDocAugmentsTag(node);
-                case 297:
-                case 292:
+                case 297 /* JSDocTypedefTag */:
+                case 292 /* JSDocCallbackTag */:
                     return checkJSDocTypeAliasTag(node);
-                case 293:
+                case 293 /* JSDocParameterTag */:
                     return checkJSDocParameterTag(node);
-                case 284:
+                case 284 /* JSDocFunctionType */:
                     checkSignatureDeclaration(node);
-                case 282:
-                case 281:
-                case 279:
-                case 280:
-                case 287:
+                // falls through
+                case 282 /* JSDocNonNullableType */:
+                case 281 /* JSDocNullableType */:
+                case 279 /* JSDocAllType */:
+                case 280 /* JSDocUnknownType */:
+                case 287 /* JSDocTypeLiteral */:
                     checkJSDocTypeIsInJsFile(node);
                     ts.forEachChild(node, checkSourceElement);
                     return;
-                case 285:
+                case 285 /* JSDocVariadicType */:
                     checkJSDocVariadicType(node);
                     return;
-                case 278:
+                case 278 /* JSDocTypeExpression */:
                     return checkSourceElement(node.type);
-                case 176:
+                case 176 /* IndexedAccessType */:
                     return checkIndexedAccessType(node);
-                case 177:
+                case 177 /* MappedType */:
                     return checkMappedType(node);
-                case 234:
+                case 234 /* FunctionDeclaration */:
                     return checkFunctionDeclaration(node);
-                case 213:
-                case 240:
+                case 213 /* Block */:
+                case 240 /* ModuleBlock */:
                     return checkBlock(node);
-                case 214:
+                case 214 /* VariableStatement */:
                     return checkVariableStatement(node);
-                case 216:
+                case 216 /* ExpressionStatement */:
                     return checkExpressionStatement(node);
-                case 217:
+                case 217 /* IfStatement */:
                     return checkIfStatement(node);
-                case 218:
+                case 218 /* DoStatement */:
                     return checkDoStatement(node);
-                case 219:
+                case 219 /* WhileStatement */:
                     return checkWhileStatement(node);
-                case 220:
+                case 220 /* ForStatement */:
                     return checkForStatement(node);
-                case 221:
+                case 221 /* ForInStatement */:
                     return checkForInStatement(node);
-                case 222:
+                case 222 /* ForOfStatement */:
                     return checkForOfStatement(node);
-                case 223:
-                case 224:
+                case 223 /* ContinueStatement */:
+                case 224 /* BreakStatement */:
                     return checkBreakOrContinueStatement(node);
-                case 225:
+                case 225 /* ReturnStatement */:
                     return checkReturnStatement(node);
-                case 226:
+                case 226 /* WithStatement */:
                     return checkWithStatement(node);
-                case 227:
+                case 227 /* SwitchStatement */:
                     return checkSwitchStatement(node);
-                case 228:
+                case 228 /* LabeledStatement */:
                     return checkLabeledStatement(node);
-                case 229:
+                case 229 /* ThrowStatement */:
                     return checkThrowStatement(node);
-                case 230:
+                case 230 /* TryStatement */:
                     return checkTryStatement(node);
-                case 232:
+                case 232 /* VariableDeclaration */:
                     return checkVariableDeclaration(node);
-                case 182:
+                case 182 /* BindingElement */:
                     return checkBindingElement(node);
-                case 235:
+                case 235 /* ClassDeclaration */:
                     return checkClassDeclaration(node);
-                case 236:
+                case 236 /* InterfaceDeclaration */:
                     return checkInterfaceDeclaration(node);
-                case 237:
+                case 237 /* TypeAliasDeclaration */:
                     return checkTypeAliasDeclaration(node);
-                case 238:
+                case 238 /* EnumDeclaration */:
                     return checkEnumDeclaration(node);
-                case 239:
+                case 239 /* ModuleDeclaration */:
                     return checkModuleDeclaration(node);
-                case 244:
+                case 244 /* ImportDeclaration */:
                     return checkImportDeclaration(node);
-                case 243:
+                case 243 /* ImportEqualsDeclaration */:
                     return checkImportEqualsDeclaration(node);
-                case 250:
+                case 250 /* ExportDeclaration */:
                     return checkExportDeclaration(node);
-                case 249:
+                case 249 /* ExportAssignment */:
                     return checkExportAssignment(node);
-                case 215:
-                case 231:
+                case 215 /* EmptyStatement */:
+                case 231 /* DebuggerStatement */:
                     checkGrammarStatementInAmbientContext(node);
                     return;
-                case 253:
+                case 253 /* MissingDeclaration */:
                     return checkMissingDeclaration(node);
             }
         }
@@ -41391,6 +52382,7 @@ var ts;
         function checkJSDocVariadicType(node) {
             checkJSDocTypeIsInJsFile(node);
             checkSourceElement(node.type);
+            // Only legal location is in the *last* parameter tag or last parameter of a JSDoc function.
             var parent = node.parent;
             if (ts.isParameter(parent) && ts.isJSDocFunctionType(parent.parent)) {
                 if (ts.last(parent.parent.parameters) !== parent) {
@@ -41408,6 +52400,7 @@ var ts;
             }
             var param = ts.getParameterSymbolFromJSDoc(paramTag);
             if (!param) {
+                // We will error in `checkJSDocParameterTag`.
                 return;
             }
             var host = ts.getHostSignatureFromJSDoc(paramTag);
@@ -41420,8 +52413,16 @@ var ts;
             var parent = node.parent;
             var paramTag = node.parent.parent;
             if (ts.isJSDocTypeExpression(node.parent) && ts.isJSDocParameterTag(paramTag)) {
+                // Else we will add a diagnostic, see `checkJSDocVariadicType`.
                 var host_1 = ts.getHostSignatureFromJSDoc(paramTag);
                 if (host_1) {
+                    /*
+                    Only return an array type if the corresponding parameter is marked as a rest parameter, or if there are no parameters.
+                    So in the following situation we will not create an array type:
+                        /** @param {...number} a * /
+                        function f(a) {}
+                    Because `a` will just be of type `number | undefined`. A synthetic `...args` will also be added, which *will* get an array type.
+                    */
                     var lastParamDeclaration = ts.lastOrUndefined(host_1.parameters);
                     var symbol = ts.getParameterSymbolFromJSDoc(paramTag);
                     if (!lastParamDeclaration ||
@@ -41435,6 +52436,15 @@ var ts;
             }
             return addOptionality(type);
         }
+        // Function and class expression bodies are checked after all statements in the enclosing body. This is
+        // to ensure constructs like the following are permitted:
+        //     const foo = function () {
+        //        const s = foo();
+        //        return "hello";
+        //     }
+        // Here, performing a full type check of the body of the function expression whilst in the process of
+        // determining the type of foo would cause foo to be given type any because of the recursive reference.
+        // Delaying the type check of the body ensures foo has been assigned a type.
         function checkNodeDeferred(node) {
             if (deferredNodes) {
                 deferredNodes.push(node);
@@ -41444,17 +52454,17 @@ var ts;
             for (var _i = 0, _a = deferredNodes; _i < _a.length; _i++) {
                 var node = _a[_i];
                 switch (node.kind) {
-                    case 192:
-                    case 193:
-                    case 154:
-                    case 153:
+                    case 192 /* FunctionExpression */:
+                    case 193 /* ArrowFunction */:
+                    case 154 /* MethodDeclaration */:
+                    case 153 /* MethodSignature */:
                         checkFunctionExpressionOrObjectLiteralMethodDeferred(node);
                         break;
-                    case 156:
-                    case 157:
+                    case 156 /* GetAccessor */:
+                    case 157 /* SetAccessor */:
                         checkAccessorDeclaration(node);
                         break;
-                    case 205:
+                    case 205 /* ClassExpression */:
                         checkClassExpressionDeferred(node);
                         break;
                 }
@@ -41468,9 +52478,9 @@ var ts;
         }
         function unusedIsError(kind) {
             switch (kind) {
-                case 0:
+                case 0 /* Local */:
                     return !!compilerOptions.noUnusedLocals;
-                case 1:
+                case 1 /* Parameter */:
                     return !!compilerOptions.noUnusedParameters;
                 default:
                     return ts.Debug.assertNever(kind);
@@ -41479,12 +52489,17 @@ var ts;
         function getPotentiallyUnusedIdentifiers(sourceFile) {
             return allPotentiallyUnusedIdentifiers.get(sourceFile.path) || ts.emptyArray;
         }
+        // Fully type check a source file and collect the relevant diagnostics.
         function checkSourceFileWorker(node) {
             var links = getNodeLinks(node);
-            if (!(links.flags & 1)) {
+            if (!(links.flags & 1 /* TypeChecked */)) {
+                // If skipLibCheck is enabled, skip type checking if file is a declaration file.
+                // If skipDefaultLibCheck is enabled, skip type checking if file contains a
+                // '/// <reference no-default-lib="true"/>' directive.
                 if (compilerOptions.skipLibCheck && node.isDeclarationFile || compilerOptions.skipDefaultLibCheck && node.hasNoDefaultLib) {
                     return;
                 }
+                // Grammar checking
                 checkGrammarSourceFile(node);
                 ts.clear(potentialThisCollisions);
                 ts.clear(potentialNewTargetCollisions);
@@ -41513,11 +52528,14 @@ var ts;
                     ts.forEach(potentialNewTargetCollisions, checkIfNewTargetIsCapturedInEnclosingScope);
                     ts.clear(potentialNewTargetCollisions);
                 }
-                links.flags |= 1;
+                links.flags |= 1 /* TypeChecked */;
             }
         }
         function getDiagnostics(sourceFile, ct) {
             try {
+                // Record the cancellation token so it can be checked later on during checkSourceElement.
+                // Do this in a finally block so we can ensure that it gets reset back to nothing after
+                // this call is done.
                 cancellationToken = ct;
                 return getDiagnosticsWorker(sourceFile);
             }
@@ -41528,20 +52546,29 @@ var ts;
         function getDiagnosticsWorker(sourceFile) {
             throwIfNonDiagnosticsProducing();
             if (sourceFile) {
+                // Some global diagnostics are deferred until they are needed and
+                // may not be reported in the firt call to getGlobalDiagnostics.
+                // We should catch these changes and report them.
                 var previousGlobalDiagnostics = diagnostics.getGlobalDiagnostics();
                 var previousGlobalDiagnosticsSize = previousGlobalDiagnostics.length;
                 checkSourceFile(sourceFile);
                 var semanticDiagnostics = diagnostics.getDiagnostics(sourceFile.fileName);
                 var currentGlobalDiagnostics = diagnostics.getGlobalDiagnostics();
                 if (currentGlobalDiagnostics !== previousGlobalDiagnostics) {
+                    // If the arrays are not the same reference, new diagnostics were added.
                     var deferredGlobalDiagnostics = ts.relativeComplement(previousGlobalDiagnostics, currentGlobalDiagnostics, ts.compareDiagnostics);
                     return ts.concatenate(deferredGlobalDiagnostics, semanticDiagnostics);
                 }
                 else if (previousGlobalDiagnosticsSize === 0 && currentGlobalDiagnostics.length > 0) {
+                    // If the arrays are the same reference, but the length has changed, a single
+                    // new diagnostic was added as DiagnosticCollection attempts to reuse the
+                    // same array.
                     return ts.concatenate(currentGlobalDiagnostics, semanticDiagnostics);
                 }
                 return semanticDiagnostics;
             }
+            // Global diagnostics are always added when a file is not provided to
+            // getDiagnostics
             ts.forEach(host.getSourceFiles(), checkSourceFile);
             return diagnostics.getDiagnostics();
         }
@@ -41554,8 +52581,10 @@ var ts;
                 throw new Error("Trying to get diagnostics from a type checker that does not produce them.");
             }
         }
+        // Language service support
         function getSymbolsInScope(location, meaning) {
-            if (location.flags & 8388608) {
+            if (location.flags & 8388608 /* InWithStatement */) {
+                // We cannot answer semantic questions within a with block, do not proceed any further
                 return [];
             }
             var symbols = ts.createSymbolTable();
@@ -41568,24 +52597,31 @@ var ts;
                         copySymbols(location.locals, meaning);
                     }
                     switch (location.kind) {
-                        case 239:
-                            copySymbols(getSymbolOfNode(location).exports, meaning & 2623475);
+                        case 239 /* ModuleDeclaration */:
+                            copySymbols(getSymbolOfNode(location).exports, meaning & 2623475 /* ModuleMember */);
                             break;
-                        case 238:
-                            copySymbols(getSymbolOfNode(location).exports, meaning & 8);
+                        case 238 /* EnumDeclaration */:
+                            copySymbols(getSymbolOfNode(location).exports, meaning & 8 /* EnumMember */);
                             break;
-                        case 205:
+                        case 205 /* ClassExpression */:
                             var className = location.name;
                             if (className) {
                                 copySymbol(location.symbol, meaning);
                             }
-                        case 235:
-                        case 236:
+                        // falls through
+                        // this fall-through is necessary because we would like to handle
+                        // type parameter inside class expression similar to how we handle it in classDeclaration and interface Declaration
+                        case 235 /* ClassDeclaration */:
+                        case 236 /* InterfaceDeclaration */:
+                            // If we didn't come from static member of class or interface,
+                            // add the type parameters into the symbol table
+                            // (type parameters of classDeclaration/classExpression and interface are in member property of the symbol.
+                            // Note: that the memberFlags come from previous iteration.
                             if (!isStatic) {
-                                copySymbols(getMembersOfSymbol(getSymbolOfNode(location)), meaning & 67901928);
+                                copySymbols(getMembersOfSymbol(getSymbolOfNode(location)), meaning & 67901928 /* Type */);
                             }
                             break;
-                        case 192:
+                        case 192 /* FunctionExpression */:
                             var funcName = location.name;
                             if (funcName) {
                                 copySymbol(location.symbol, meaning);
@@ -41595,14 +52631,24 @@ var ts;
                     if (ts.introducesArgumentsExoticObject(location)) {
                         copySymbol(argumentsSymbol, meaning);
                     }
-                    isStatic = ts.hasModifier(location, 32);
+                    isStatic = ts.hasModifier(location, 32 /* Static */);
                     location = location.parent;
                 }
                 copySymbols(globals, meaning);
             }
+            /**
+             * Copy the given symbol into symbol tables if the symbol has the given meaning
+             * and it doesn't already existed in the symbol table
+             * @param key a key for storing in symbol table; if undefined, use symbol.name
+             * @param symbol the symbol to be added into symbol table
+             * @param meaning meaning of symbol to filter by before adding to symbol table
+             */
             function copySymbol(symbol, meaning) {
                 if (ts.getCombinedLocalAndExportSymbolFlags(symbol) & meaning) {
                     var id = symbol.escapedName;
+                    // We will copy all symbol regardless of its reserved name because
+                    // symbolsToArray will check whether the key is a reserved name and
+                    // it will not copy symbol with reserved name to the array
                     if (!symbols.has(id)) {
                         symbols.set(id, symbol);
                     }
@@ -41617,33 +52663,34 @@ var ts;
             }
         }
         function isTypeDeclarationName(name) {
-            return name.kind === 71 &&
+            return name.kind === 71 /* Identifier */ &&
                 isTypeDeclaration(name.parent) &&
                 name.parent.name === name;
         }
         function isTypeDeclaration(node) {
             switch (node.kind) {
-                case 148:
-                case 235:
-                case 236:
-                case 237:
-                case 238:
+                case 148 /* TypeParameter */:
+                case 235 /* ClassDeclaration */:
+                case 236 /* InterfaceDeclaration */:
+                case 237 /* TypeAliasDeclaration */:
+                case 238 /* EnumDeclaration */:
                     return true;
                 default:
                     return false;
             }
         }
+        // True if the given identifier is part of a type reference
         function isTypeReferenceIdentifier(node) {
-            while (node.parent.kind === 146) {
+            while (node.parent.kind === 146 /* QualifiedName */) {
                 node = node.parent;
             }
-            return node.parent.kind === 162;
+            return node.parent.kind === 162 /* TypeReference */;
         }
         function isHeritageClauseElementIdentifier(node) {
-            while (node.parent.kind === 185) {
+            while (node.parent.kind === 185 /* PropertyAccessExpression */) {
                 node = node.parent;
             }
-            return node.parent.kind === 207;
+            return node.parent.kind === 207 /* ExpressionWithTypeArguments */;
         }
         function forEachEnclosingClass(node, callback) {
             var result;
@@ -41671,13 +52718,13 @@ var ts;
             return !!forEachEnclosingClass(node, function (n) { return n === classDeclaration; });
         }
         function getLeftSideOfImportEqualsOrExportAssignment(nodeOnRightSide) {
-            while (nodeOnRightSide.parent.kind === 146) {
+            while (nodeOnRightSide.parent.kind === 146 /* QualifiedName */) {
                 nodeOnRightSide = nodeOnRightSide.parent;
             }
-            if (nodeOnRightSide.parent.kind === 243) {
+            if (nodeOnRightSide.parent.kind === 243 /* ImportEqualsDeclaration */) {
                 return nodeOnRightSide.parent.moduleReference === nodeOnRightSide ? nodeOnRightSide.parent : undefined;
             }
-            if (nodeOnRightSide.parent.kind === 249) {
+            if (nodeOnRightSide.parent.kind === 249 /* ExportAssignment */) {
                 return nodeOnRightSide.parent.expression === nodeOnRightSide ? nodeOnRightSide.parent : undefined;
             }
             return undefined;
@@ -41688,12 +52735,12 @@ var ts;
         function getSpecialPropertyAssignmentSymbolFromEntityName(entityName) {
             var specialPropertyAssignmentKind = ts.getSpecialPropertyAssignmentKind(entityName.parent.parent);
             switch (specialPropertyAssignmentKind) {
-                case 1:
-                case 3:
+                case 1 /* ExportsProperty */:
+                case 3 /* PrototypeProperty */:
                     return getSymbolOfNode(entityName.parent);
-                case 4:
-                case 2:
-                case 5:
+                case 4 /* ThisProperty */:
+                case 2 /* ModuleExports */:
+                case 5 /* Property */:
                     return getSymbolOfNode(entityName.parent.parent);
             }
         }
@@ -41703,7 +52750,7 @@ var ts;
                 node = parent;
                 parent = parent.parent;
             }
-            if (parent && parent.kind === 179 && parent.qualifier === node) {
+            if (parent && parent.kind === 179 /* ImportType */ && parent.qualifier === node) {
                 return parent;
             }
             return undefined;
@@ -41713,23 +52760,27 @@ var ts;
                 return getSymbolOfNode(entityName.parent);
             }
             if (ts.isInJavaScriptFile(entityName) &&
-                entityName.parent.kind === 185 &&
+                entityName.parent.kind === 185 /* PropertyAccessExpression */ &&
                 entityName.parent === entityName.parent.parent.left) {
+                // Check if this is a special property assignment
                 var specialPropertyAssignmentSymbol = getSpecialPropertyAssignmentSymbolFromEntityName(entityName);
                 if (specialPropertyAssignmentSymbol) {
                     return specialPropertyAssignmentSymbol;
                 }
             }
-            if (entityName.parent.kind === 249 && ts.isEntityNameExpression(entityName)) {
-                var success = resolveEntityName(entityName, 67216319 | 67901928 | 1920 | 2097152, true);
+            if (entityName.parent.kind === 249 /* ExportAssignment */ && ts.isEntityNameExpression(entityName)) {
+                // Even an entity name expression that doesn't resolve as an entityname may still typecheck as a property access expression
+                var success = resolveEntityName(entityName, 
+                /*all meanings*/ 67216319 /* Value */ | 67901928 /* Type */ | 1920 /* Namespace */ | 2097152 /* Alias */, /*ignoreErrors*/ true);
                 if (success && success !== unknownSymbol) {
                     return success;
                 }
             }
             else if (!ts.isPropertyAccessExpression(entityName) && isInRightSideOfImportOrExportAssignment(entityName)) {
-                var importEqualsDeclaration = ts.getAncestor(entityName, 243);
+                // Since we already checked for ExportAssignment, this really could only be an Import
+                var importEqualsDeclaration = ts.getAncestor(entityName, 243 /* ImportEqualsDeclaration */);
                 ts.Debug.assert(importEqualsDeclaration !== undefined);
-                return getSymbolOfPartOfRightHandSideOfImportEquals(entityName, true);
+                return getSymbolOfPartOfRightHandSideOfImportEquals(entityName, /*dontResolveAlias*/ true);
             }
             if (!ts.isPropertyAccessExpression(entityName)) {
                 var possibleImportNode = isImportTypeQualifierPart(entityName);
@@ -41743,47 +52794,50 @@ var ts;
                 entityName = entityName.parent;
             }
             if (isHeritageClauseElementIdentifier(entityName)) {
-                var meaning = 0;
-                if (entityName.parent.kind === 207) {
-                    meaning = 67901928;
+                var meaning = 0 /* None */;
+                // In an interface or class, we're definitely interested in a type.
+                if (entityName.parent.kind === 207 /* ExpressionWithTypeArguments */) {
+                    meaning = 67901928 /* Type */;
+                    // In a class 'extends' clause we are also looking for a value.
                     if (ts.isExpressionWithTypeArgumentsInClassExtendsClause(entityName.parent)) {
-                        meaning |= 67216319;
+                        meaning |= 67216319 /* Value */;
                     }
                 }
                 else {
-                    meaning = 1920;
+                    meaning = 1920 /* Namespace */;
                 }
-                meaning |= 2097152;
+                meaning |= 2097152 /* Alias */;
                 var entityNameSymbol = ts.isEntityNameExpression(entityName) ? resolveEntityName(entityName, meaning) : undefined;
                 if (entityNameSymbol) {
                     return entityNameSymbol;
                 }
             }
-            if (entityName.parent.kind === 293) {
+            if (entityName.parent.kind === 293 /* JSDocParameterTag */) {
                 return ts.getParameterSymbolFromJSDoc(entityName.parent);
             }
-            if (entityName.parent.kind === 148 && entityName.parent.parent.kind === 296) {
-                ts.Debug.assert(!ts.isInJavaScriptFile(entityName));
+            if (entityName.parent.kind === 148 /* TypeParameter */ && entityName.parent.parent.kind === 296 /* JSDocTemplateTag */) {
+                ts.Debug.assert(!ts.isInJavaScriptFile(entityName)); // Otherwise `isDeclarationName` would have been true.
                 var typeParameter = ts.getTypeParameterFromJsDoc(entityName.parent);
                 return typeParameter && typeParameter.symbol;
             }
             if (ts.isExpressionNode(entityName)) {
                 if (ts.nodeIsMissing(entityName)) {
+                    // Missing entity name.
                     return undefined;
                 }
-                if (entityName.kind === 71) {
+                if (entityName.kind === 71 /* Identifier */) {
                     if (ts.isJSXTagName(entityName) && isJsxIntrinsicIdentifier(entityName)) {
                         var symbol = getIntrinsicTagSymbol(entityName.parent);
                         return symbol === unknownSymbol ? undefined : symbol;
                     }
-                    return resolveEntityName(entityName, 67216319, false, true);
+                    return resolveEntityName(entityName, 67216319 /* Value */, /*ignoreErrors*/ false, /*dontResolveAlias*/ true);
                 }
-                else if (entityName.kind === 185 || entityName.kind === 146) {
+                else if (entityName.kind === 185 /* PropertyAccessExpression */ || entityName.kind === 146 /* QualifiedName */) {
                     var links = getNodeLinks(entityName);
                     if (links.resolvedSymbol) {
                         return links.resolvedSymbol;
                     }
-                    if (entityName.kind === 185) {
+                    if (entityName.kind === 185 /* PropertyAccessExpression */) {
                         checkPropertyAccessExpression(entityName);
                     }
                     else {
@@ -41793,38 +52847,41 @@ var ts;
                 }
             }
             else if (isTypeReferenceIdentifier(entityName)) {
-                var meaning = entityName.parent.kind === 162 ? 67901928 : 1920;
-                return resolveEntityName(entityName, meaning, false, true);
+                var meaning = entityName.parent.kind === 162 /* TypeReference */ ? 67901928 /* Type */ : 1920 /* Namespace */;
+                return resolveEntityName(entityName, meaning, /*ignoreErrors*/ false, /*dontResolveAlias*/ true);
             }
-            else if (entityName.parent.kind === 262) {
+            else if (entityName.parent.kind === 262 /* JsxAttribute */) {
                 return getJsxAttributePropertySymbol(entityName.parent);
             }
-            if (entityName.parent.kind === 161) {
-                return resolveEntityName(entityName, 1);
+            if (entityName.parent.kind === 161 /* TypePredicate */) {
+                return resolveEntityName(entityName, /*meaning*/ 1 /* FunctionScopedVariable */);
             }
+            // Do we want to return undefined here?
             return undefined;
         }
         function getSymbolAtLocation(node) {
-            if (node.kind === 274) {
+            if (node.kind === 274 /* SourceFile */) {
                 return ts.isExternalModule(node) ? getMergedSymbol(node.symbol) : undefined;
             }
             var parent = node.parent;
             var grandParent = parent.parent;
-            if (node.flags & 8388608) {
+            if (node.flags & 8388608 /* InWithStatement */) {
+                // We cannot answer semantic questions within a with block, do not proceed any further
                 return undefined;
             }
             if (isDeclarationNameOrImportPropertyName(node)) {
+                // This is a declaration, call getSymbolOfNode
                 return getSymbolOfNode(parent);
             }
             else if (ts.isLiteralComputedPropertyDeclarationName(node)) {
                 return getSymbolOfNode(parent.parent);
             }
-            if (node.kind === 71) {
+            if (node.kind === 71 /* Identifier */) {
                 if (isInRightSideOfImportOrExportAssignment(node)) {
                     return getSymbolOfEntityNameOrPropertyAccessExpression(node);
                 }
-                else if (parent.kind === 182 &&
-                    grandParent.kind === 180 &&
+                else if (parent.kind === 182 /* BindingElement */ &&
+                    grandParent.kind === 180 /* ObjectBindingPattern */ &&
                     node === parent.propertyName) {
                     var typeOfPattern = getTypeOfNode(grandParent);
                     var propertyDeclaration = typeOfPattern && getPropertyOfType(typeOfPattern, node.escapedText);
@@ -41834,12 +52891,12 @@ var ts;
                 }
             }
             switch (node.kind) {
-                case 71:
-                case 185:
-                case 146:
+                case 71 /* Identifier */:
+                case 185 /* PropertyAccessExpression */:
+                case 146 /* QualifiedName */:
                     return getSymbolOfEntityNameOrPropertyAccessExpression(node);
-                case 99:
-                    var container = ts.getThisContainer(node, false);
+                case 99 /* ThisKeyword */:
+                    var container = ts.getThisContainer(node, /*includeArrowFunctions*/ false);
                     if (ts.isFunctionLike(container)) {
                         var sig = getSignatureFromDeclaration(container);
                         if (sig.thisParameter) {
@@ -41849,54 +52906,64 @@ var ts;
                     if (ts.isInExpressionContext(node)) {
                         return checkExpression(node).symbol;
                     }
-                case 174:
+                // falls through
+                case 174 /* ThisType */:
                     return getTypeFromThisTypeNode(node).symbol;
-                case 97:
+                case 97 /* SuperKeyword */:
                     return checkExpression(node).symbol;
-                case 123:
+                case 123 /* ConstructorKeyword */:
+                    // constructor keyword for an overload, should take us to the definition if it exist
                     var constructorDeclaration = node.parent;
-                    if (constructorDeclaration && constructorDeclaration.kind === 155) {
+                    if (constructorDeclaration && constructorDeclaration.kind === 155 /* Constructor */) {
                         return constructorDeclaration.parent.symbol;
                     }
                     return undefined;
-                case 9:
-                case 13:
+                case 9 /* StringLiteral */:
+                case 13 /* NoSubstitutionTemplateLiteral */:
+                    // 1). import x = require("./mo/*gotToDefinitionHere*/d")
+                    // 2). External module name in an import declaration
+                    // 3). Dynamic import call or require in javascript
+                    // 4). type A = import("./f/*gotToDefinitionHere*/oo")
                     if ((ts.isExternalModuleImportEqualsDeclaration(node.parent.parent) && ts.getExternalModuleImportEqualsDeclarationExpression(node.parent.parent) === node) ||
-                        ((node.parent.kind === 244 || node.parent.kind === 250) && node.parent.moduleSpecifier === node) ||
-                        ((ts.isInJavaScriptFile(node) && ts.isRequireCall(node.parent, false)) || ts.isImportCall(node.parent)) ||
+                        ((node.parent.kind === 244 /* ImportDeclaration */ || node.parent.kind === 250 /* ExportDeclaration */) && node.parent.moduleSpecifier === node) ||
+                        ((ts.isInJavaScriptFile(node) && ts.isRequireCall(node.parent, /*checkArgumentIsStringLiteralLike*/ false)) || ts.isImportCall(node.parent)) ||
                         (ts.isLiteralTypeNode(node.parent) && ts.isLiteralImportTypeNode(node.parent.parent) && node.parent.parent.argument === node.parent)) {
                         return resolveExternalModuleName(node, node);
                     }
-                case 8:
+                // falls through
+                case 8 /* NumericLiteral */:
+                    // index access
                     var objectType = ts.isElementAccessExpression(parent)
                         ? parent.argumentExpression === node ? getTypeOfExpression(parent.expression) : undefined
                         : ts.isLiteralTypeNode(parent) && ts.isIndexedAccessTypeNode(grandParent)
                             ? getTypeFromTypeNode(grandParent.objectType)
                             : undefined;
                     return objectType && getPropertyOfType(objectType, ts.escapeLeadingUnderscores(node.text));
-                case 79:
-                case 89:
-                case 36:
+                case 79 /* DefaultKeyword */:
+                case 89 /* FunctionKeyword */:
+                case 36 /* EqualsGreaterThanToken */:
                     return getSymbolOfNode(node.parent);
-                case 179:
+                case 179 /* ImportType */:
                     return ts.isLiteralImportTypeNode(node) ? getSymbolAtLocation(node.argument.literal) : undefined;
                 default:
                     return undefined;
             }
         }
         function getShorthandAssignmentValueSymbol(location) {
-            if (location && location.kind === 271) {
-                return resolveEntityName(location.name, 67216319 | 2097152);
+            if (location && location.kind === 271 /* ShorthandPropertyAssignment */) {
+                return resolveEntityName(location.name, 67216319 /* Value */ | 2097152 /* Alias */);
             }
             return undefined;
         }
+        /** Returns the target of an export specifier without following aliases */
         function getExportSpecifierLocalTargetSymbol(node) {
             return node.parent.parent.moduleSpecifier ?
                 getExternalModuleMember(node.parent.parent, node) :
-                resolveEntityName(node.propertyName || node.name, 67216319 | 67901928 | 1920 | 2097152);
+                resolveEntityName(node.propertyName || node.name, 67216319 /* Value */ | 67901928 /* Type */ | 1920 /* Namespace */ | 2097152 /* Alias */);
         }
         function getTypeOfNode(node) {
-            if (node.flags & 8388608) {
+            if (node.flags & 8388608 /* InWithStatement */) {
+                // We cannot answer semantic questions within a with block, do not proceed any further
                 return errorType;
             }
             if (ts.isPartOfTypeNode(node)) {
@@ -41912,12 +52979,15 @@ var ts;
                 return getRegularTypeOfExpression(node);
             }
             if (ts.isExpressionWithTypeArgumentsInClassExtendsClause(node)) {
+                // A SyntaxKind.ExpressionWithTypeArguments is considered a type node, except when it occurs in the
+                // extends clause of a class. We handle that case here.
                 var classNode = ts.getContainingClass(node);
                 var classType = getDeclaredTypeOfSymbol(getSymbolOfNode(classNode));
                 var baseType = getBaseTypes(classType)[0];
                 return baseType && getTypeWithThisArgument(baseType, classType.thisType);
             }
             if (isTypeDeclaration(node)) {
+                // In this case, we call getSymbolOfNode instead of getSymbolAtLocation because it is a declaration
                 var symbol = getSymbolOfNode(node);
                 return getDeclaredTypeOfSymbol(symbol);
             }
@@ -41926,6 +52996,7 @@ var ts;
                 return symbol && getDeclaredTypeOfSymbol(symbol);
             }
             if (ts.isDeclaration(node)) {
+                // In this case, we call getSymbolOfNode instead of getSymbolAtLocation because it is a declaration
                 var symbol = getSymbolOfNode(node);
                 return getTypeOfSymbol(symbol);
             }
@@ -41934,7 +53005,7 @@ var ts;
                 return symbol && getTypeOfSymbol(symbol);
             }
             if (ts.isBindingPattern(node)) {
-                return getTypeForVariableLikeDeclaration(node.parent, true);
+                return getTypeForVariableLikeDeclaration(node.parent, /*includeOptionality*/ true);
             }
             if (isInRightSideOfImportOrExportAssignment(node)) {
                 var symbol = getSymbolAtLocation(node);
@@ -41945,26 +53016,48 @@ var ts;
             }
             return errorType;
         }
+        // Gets the type of object literal or array literal of destructuring assignment.
+        // { a } from
+        //     for ( { a } of elems) {
+        //     }
+        // [ a ] from
+        //     [a] = [ some array ...]
         function getTypeOfArrayLiteralOrObjectLiteralDestructuringAssignment(expr) {
-            ts.Debug.assert(expr.kind === 184 || expr.kind === 183);
-            if (expr.parent.kind === 222) {
+            ts.Debug.assert(expr.kind === 184 /* ObjectLiteralExpression */ || expr.kind === 183 /* ArrayLiteralExpression */);
+            // If this is from "for of"
+            //     for ( { a } of elems) {
+            //     }
+            if (expr.parent.kind === 222 /* ForOfStatement */) {
                 var iteratedType = checkRightHandSideOfForOf(expr.parent.expression, expr.parent.awaitModifier);
                 return checkDestructuringAssignment(expr, iteratedType || errorType);
             }
-            if (expr.parent.kind === 200) {
+            // If this is from "for" initializer
+            //     for ({a } = elems[0];.....) { }
+            if (expr.parent.kind === 200 /* BinaryExpression */) {
                 var iteratedType = getTypeOfExpression(expr.parent.right);
                 return checkDestructuringAssignment(expr, iteratedType || errorType);
             }
-            if (expr.parent.kind === 270) {
+            // If this is from nested object binding pattern
+            //     for ({ skills: { primary, secondary } } = multiRobot, i = 0; i < 1; i++) {
+            if (expr.parent.kind === 270 /* PropertyAssignment */) {
                 var typeOfParentObjectLiteral = getTypeOfArrayLiteralOrObjectLiteralDestructuringAssignment(expr.parent.parent);
-                return checkObjectLiteralDestructuringPropertyAssignment(typeOfParentObjectLiteral || errorType, expr.parent);
+                return checkObjectLiteralDestructuringPropertyAssignment(typeOfParentObjectLiteral || errorType, expr.parent); // TODO: GH#18217
             }
-            ts.Debug.assert(expr.parent.kind === 183);
+            // Array literal assignment - array destructuring pattern
+            ts.Debug.assert(expr.parent.kind === 183 /* ArrayLiteralExpression */);
+            //    [{ property1: p1, property2 }] = elems;
             var typeOfArrayLiteral = getTypeOfArrayLiteralOrObjectLiteralDestructuringAssignment(expr.parent);
-            var elementType = checkIteratedTypeOrElementType(typeOfArrayLiteral || errorType, expr.parent, false, false) || errorType;
-            return checkArrayLiteralDestructuringElementAssignment(expr.parent, typeOfArrayLiteral, expr.parent.elements.indexOf(expr), elementType || errorType);
+            var elementType = checkIteratedTypeOrElementType(typeOfArrayLiteral || errorType, expr.parent, /*allowStringInput*/ false, /*allowAsyncIterables*/ false) || errorType;
+            return checkArrayLiteralDestructuringElementAssignment(expr.parent, typeOfArrayLiteral, expr.parent.elements.indexOf(expr), elementType || errorType); // TODO: GH#18217
         }
+        // Gets the property symbol corresponding to the property in destructuring assignment
+        // 'property1' from
+        //     for ( { property1: a } of elems) {
+        //     }
+        // 'property1' at location 'a' from:
+        //     [a] = [ property1, property2 ]
         function getPropertySymbolOfDestructuringAssignment(location) {
+            // Get the type of the object or array literal and then look for property of given name in the type
             var typeOfObjectLiteral = getTypeOfArrayLiteralOrObjectLiteralDestructuringAssignment(location.parent.parent);
             return typeOfObjectLiteral && getPropertyOfType(typeOfObjectLiteral, location.escapedText);
         }
@@ -41974,12 +53067,18 @@ var ts;
             }
             return getRegularTypeOfLiteralType(getTypeOfExpression(expr));
         }
+        /**
+         * Gets either the static or instance type of a class element, based on
+         * whether the element is declared as "static".
+         */
         function getParentTypeOfClassElement(node) {
             var classSymbol = getSymbolOfNode(node.parent);
-            return ts.hasModifier(node, 32)
+            return ts.hasModifier(node, 32 /* Static */)
                 ? getTypeOfSymbol(classSymbol)
                 : getDeclaredTypeOfSymbol(classSymbol);
         }
+        // Return the list of properties of the given type, augmented with properties from Function
+        // if the type has call or construct signatures
         function getAugmentedPropertiesOfType(type) {
             type = getApparentType(type);
             var propsByName = ts.createSymbolTable(getPropertiesOfType(type));
@@ -42000,10 +53099,10 @@ var ts;
             return roots ? ts.flatMap(roots, getRootSymbols) : [symbol];
         }
         function getImmediateRootSymbols(symbol) {
-            if (ts.getCheckFlags(symbol) & 6) {
+            if (ts.getCheckFlags(symbol) & 6 /* Synthetic */) {
                 return ts.mapDefined(getSymbolLinks(symbol).containingType.types, function (type) { return getPropertyOfType(type, symbol.escapedName); });
             }
-            else if (symbol.flags & 33554432) {
+            else if (symbol.flags & 33554432 /* Transient */) {
                 var _a = symbol, leftSpread = _a.leftSpread, rightSpread = _a.rightSpread, syntheticOrigin = _a.syntheticOrigin;
                 return leftSpread ? [leftSpread, rightSpread]
                     : syntheticOrigin ? [syntheticOrigin]
@@ -42019,11 +53118,12 @@ var ts;
             }
             return target;
         }
+        // Emitter support
         function isArgumentsLocalBinding(nodeIn) {
             if (!ts.isGeneratedIdentifier(nodeIn)) {
                 var node = ts.getParseTreeNode(nodeIn, ts.isIdentifier);
                 if (node) {
-                    var isPropertyName_1 = node.parent.kind === 185 && node.parent.name === node;
+                    var isPropertyName_1 = node.parent.kind === 185 /* PropertyAccessExpression */ && node.parent.name === node;
                     return !isPropertyName_1 && getReferencedValueSymbol(node) === argumentsSymbol;
                 }
             }
@@ -42032,42 +53132,57 @@ var ts;
         function moduleExportsSomeValue(moduleReferenceExpression) {
             var moduleSymbol = resolveExternalModuleName(moduleReferenceExpression.parent, moduleReferenceExpression);
             if (!moduleSymbol || ts.isShorthandAmbientModuleSymbol(moduleSymbol)) {
+                // If the module is not found or is shorthand, assume that it may export a value.
                 return true;
             }
             var hasExportAssignment = hasExportAssignmentSymbol(moduleSymbol);
+            // if module has export assignment then 'resolveExternalModuleSymbol' will return resolved symbol for export assignment
+            // otherwise it will return moduleSymbol itself
             moduleSymbol = resolveExternalModuleSymbol(moduleSymbol);
             var symbolLinks = getSymbolLinks(moduleSymbol);
             if (symbolLinks.exportsSomeValue === undefined) {
+                // for export assignments - check if resolved symbol for RHS is itself a value
+                // otherwise - check if at least one export is value
                 symbolLinks.exportsSomeValue = hasExportAssignment
-                    ? !!(moduleSymbol.flags & 67216319)
+                    ? !!(moduleSymbol.flags & 67216319 /* Value */)
                     : ts.forEachEntry(getExportsOfModule(moduleSymbol), isValue);
             }
             return symbolLinks.exportsSomeValue;
             function isValue(s) {
                 s = resolveSymbol(s);
-                return s && !!(s.flags & 67216319);
+                return s && !!(s.flags & 67216319 /* Value */);
             }
         }
         function isNameOfModuleOrEnumDeclaration(node) {
             return ts.isModuleOrEnumDeclaration(node.parent) && node === node.parent.name;
         }
+        // When resolved as an expression identifier, if the given node references an exported entity, return the declaration
+        // node of the exported entity's container. Otherwise, return undefined.
         function getReferencedExportContainer(nodeIn, prefixLocals) {
             var node = ts.getParseTreeNode(nodeIn, ts.isIdentifier);
             if (node) {
-                var symbol = getReferencedValueSymbol(node, isNameOfModuleOrEnumDeclaration(node));
+                // When resolving the export container for the name of a module or enum
+                // declaration, we need to start resolution at the declaration's container.
+                // Otherwise, we could incorrectly resolve the export container as the
+                // declaration if it contains an exported member with the same name.
+                var symbol = getReferencedValueSymbol(node, /*startInDeclarationContainer*/ isNameOfModuleOrEnumDeclaration(node));
                 if (symbol) {
-                    if (symbol.flags & 1048576) {
+                    if (symbol.flags & 1048576 /* ExportValue */) {
+                        // If we reference an exported entity within the same module declaration, then whether
+                        // we prefix depends on the kind of entity. SymbolFlags.ExportHasLocal encompasses all the
+                        // kinds that we do NOT prefix.
                         var exportSymbol = getMergedSymbol(symbol.exportSymbol);
-                        if (!prefixLocals && exportSymbol.flags & 944 && !(exportSymbol.flags & 3)) {
+                        if (!prefixLocals && exportSymbol.flags & 944 /* ExportHasLocal */ && !(exportSymbol.flags & 3 /* Variable */)) {
                             return undefined;
                         }
                         symbol = exportSymbol;
                     }
                     var parentSymbol_1 = getParentOfSymbol(symbol);
                     if (parentSymbol_1) {
-                        if (parentSymbol_1.flags & 512 && parentSymbol_1.valueDeclaration.kind === 274) {
+                        if (parentSymbol_1.flags & 512 /* ValueModule */ && parentSymbol_1.valueDeclaration.kind === 274 /* SourceFile */) {
                             var symbolFile = parentSymbol_1.valueDeclaration;
                             var referenceFile = ts.getSourceFileOfNode(node);
+                            // If `node` accesses an export and that export isn't in the same file, then symbol is a namespace export, so return undefined.
                             var symbolIsUmdExport = symbolFile !== referenceFile;
                             return symbolIsUmdExport ? undefined : symbolFile;
                         }
@@ -42076,30 +53191,50 @@ var ts;
                 }
             }
         }
+        // When resolved as an expression identifier, if the given node references an import, return the declaration of
+        // that import. Otherwise, return undefined.
         function getReferencedImportDeclaration(nodeIn) {
             var node = ts.getParseTreeNode(nodeIn, ts.isIdentifier);
             if (node) {
                 var symbol = getReferencedValueSymbol(node);
-                if (isNonLocalAlias(symbol, 67216319)) {
+                // We should only get the declaration of an alias if there isn't a local value
+                // declaration for the symbol
+                if (isNonLocalAlias(symbol, /*excludes*/ 67216319 /* Value */)) {
                     return getDeclarationOfAliasSymbol(symbol);
                 }
             }
             return undefined;
         }
         function isSymbolOfDeclarationWithCollidingName(symbol) {
-            if (symbol.flags & 418) {
+            if (symbol.flags & 418 /* BlockScoped */) {
                 var links = getSymbolLinks(symbol);
                 if (links.isDeclarationWithCollidingName === undefined) {
                     var container = ts.getEnclosingBlockScopeContainer(symbol.valueDeclaration);
                     if (ts.isStatementWithLocals(container)) {
                         var nodeLinks_1 = getNodeLinks(symbol.valueDeclaration);
-                        if (resolveName(container.parent, symbol.escapedName, 67216319, undefined, undefined, false)) {
+                        if (resolveName(container.parent, symbol.escapedName, 67216319 /* Value */, /*nameNotFoundMessage*/ undefined, /*nameArg*/ undefined, /*isUse*/ false)) {
+                            // redeclaration - always should be renamed
                             links.isDeclarationWithCollidingName = true;
                         }
-                        else if (nodeLinks_1.flags & 131072) {
-                            var isDeclaredInLoop = nodeLinks_1.flags & 262144;
-                            var inLoopInitializer = ts.isIterationStatement(container, false);
-                            var inLoopBodyBlock = container.kind === 213 && ts.isIterationStatement(container.parent, false);
+                        else if (nodeLinks_1.flags & 131072 /* CapturedBlockScopedBinding */) {
+                            // binding is captured in the function
+                            // should be renamed if:
+                            // - binding is not top level - top level bindings never collide with anything
+                            // AND
+                            //   - binding is not declared in loop, should be renamed to avoid name reuse across siblings
+                            //     let a, b
+                            //     { let x = 1; a = () => x; }
+                            //     { let x = 100; b = () => x; }
+                            //     console.log(a()); // should print '1'
+                            //     console.log(b()); // should print '100'
+                            //     OR
+                            //   - binding is declared inside loop but not in inside initializer of iteration statement or directly inside loop body
+                            //     * variables from initializer are passed to rewritten loop body as parameters so they are not captured directly
+                            //     * variables that are declared immediately in loop body will become top level variable after loop is rewritten and thus
+                            //       they will not collide with anything
+                            var isDeclaredInLoop = nodeLinks_1.flags & 262144 /* BlockScopedBindingInLoop */;
+                            var inLoopInitializer = ts.isIterationStatement(container, /*lookInLabeledStatements*/ false);
+                            var inLoopBodyBlock = container.kind === 213 /* Block */ && ts.isIterationStatement(container.parent, /*lookInLabeledStatements*/ false);
                             links.isDeclarationWithCollidingName = !ts.isBlockScopedContainerTopLevel(container) && (!isDeclaredInLoop || (!inLoopInitializer && !inLoopBodyBlock));
                         }
                         else {
@@ -42111,6 +53246,9 @@ var ts;
             }
             return false;
         }
+        // When resolved as an expression identifier, if the given node references a nested block scoped entity with
+        // a name that either hides an existing name or might hide it when compiled downlevel,
+        // return the declaration of that entity. Otherwise, return undefined.
         function getReferencedDeclarationWithCollidingName(nodeIn) {
             if (!ts.isGeneratedIdentifier(nodeIn)) {
                 var node = ts.getParseTreeNode(nodeIn, ts.isIdentifier);
@@ -42123,6 +53261,8 @@ var ts;
             }
             return undefined;
         }
+        // Return true if the given node is a declaration of a nested block scoped entity with a name that either hides an
+        // existing name or might hide a name when compiled downlevel
         function isDeclarationWithCollidingName(nodeIn) {
             var node = ts.getParseTreeNode(nodeIn, ts.isDeclaration);
             if (node) {
@@ -42135,18 +53275,18 @@ var ts;
         }
         function isValueAliasDeclaration(node) {
             switch (node.kind) {
-                case 243:
-                case 245:
-                case 246:
-                case 248:
-                case 252:
+                case 243 /* ImportEqualsDeclaration */:
+                case 245 /* ImportClause */:
+                case 246 /* NamespaceImport */:
+                case 248 /* ImportSpecifier */:
+                case 252 /* ExportSpecifier */:
                     return isAliasResolvedToValue(getSymbolOfNode(node) || unknownSymbol);
-                case 250:
+                case 250 /* ExportDeclaration */:
                     var exportClause = node.exportClause;
                     return !!exportClause && ts.some(exportClause.elements, isValueAliasDeclaration);
-                case 249:
+                case 249 /* ExportAssignment */:
                     return node.expression
-                        && node.expression.kind === 71
+                        && node.expression.kind === 71 /* Identifier */
                         ? isAliasResolvedToValue(getSymbolOfNode(node) || unknownSymbol)
                         : true;
             }
@@ -42154,7 +53294,8 @@ var ts;
         }
         function isTopLevelValueImportEqualsWithEntityName(nodeIn) {
             var node = ts.getParseTreeNode(nodeIn, ts.isImportEqualsDeclaration);
-            if (node === undefined || node.parent.kind !== 274 || !ts.isInternalModuleImportEqualsDeclaration(node)) {
+            if (node === undefined || node.parent.kind !== 274 /* SourceFile */ || !ts.isInternalModuleImportEqualsDeclaration(node)) {
+                // parent is not source file or it is not reference to internal module
                 return false;
             }
             var isValue = isAliasResolvedToValue(getSymbolOfNode(node));
@@ -42165,7 +53306,9 @@ var ts;
             if (target === unknownSymbol) {
                 return true;
             }
-            return !!(target.flags & 67216319) &&
+            // const enums and modules that contain only const enums are not considered values from the emit perspective
+            // unless 'preserveConstEnums' option is set to true
+            return !!(target.flags & 67216319 /* Value */) &&
                 (compilerOptions.preserveConstEnums || !isConstEnumOrConstEnumOnlyModule(target));
         }
         function isConstEnumOrConstEnumOnlyModule(s) {
@@ -42177,8 +53320,9 @@ var ts;
                 if (symbol && getSymbolLinks(symbol).referenced) {
                     return true;
                 }
-                var target = getSymbolLinks(symbol).target;
-                if (target && ts.getModifierFlags(node) & 1 && target.flags & 67216319) {
+                var target = getSymbolLinks(symbol).target; // TODO: GH#18217
+                if (target && ts.getModifierFlags(node) & 1 /* Export */ && target.flags & 67216319 /* Value */) {
+                    // An `export import ... =` of a value symbol is always considered referenced
                     return true;
                 }
             }
@@ -42190,10 +53334,21 @@ var ts;
         function isImplementationOfOverload(node) {
             if (ts.nodeIsPresent(node.body)) {
                 if (ts.isGetAccessor(node) || ts.isSetAccessor(node))
-                    return false;
+                    return false; // Get or set accessors can never be overload implementations, but can have up to 2 signatures
                 var symbol = getSymbolOfNode(node);
                 var signaturesOfSymbol = getSignaturesOfSymbol(symbol);
+                // If this function body corresponds to function with multiple signature, it is implementation of overload
+                // e.g.: function foo(a: string): string;
+                //       function foo(a: number): number;
+                //       function foo(a: any) { // This is implementation of the overloads
+                //           return a;
+                //       }
                 return signaturesOfSymbol.length > 1 ||
+                    // If there is single signature for the symbol, it is overload if that signature isn't coming from the node
+                    // e.g.: function foo(a: string): string;
+                    //       function foo(a: any) { // This is implementation of the overloads
+                    //           return a;
+                    //       }
                     (signaturesOfSymbol.length === 1 && signaturesOfSymbol[0].declaration !== node);
             }
             return false;
@@ -42203,13 +53358,13 @@ var ts;
                 !isOptionalParameter(parameter) &&
                 !ts.isJSDocParameterTag(parameter) &&
                 !!parameter.initializer &&
-                !ts.hasModifier(parameter, 92);
+                !ts.hasModifier(parameter, 92 /* ParameterPropertyModifier */);
         }
         function isOptionalUninitializedParameterProperty(parameter) {
             return strictNullChecks &&
                 isOptionalParameter(parameter) &&
                 !parameter.initializer &&
-                ts.hasModifier(parameter, 92);
+                ts.hasModifier(parameter, 92 /* ParameterPropertyModifier */);
         }
         function getNodeCheckFlags(node) {
             return getNodeLinks(node).flags || 0;
@@ -42220,19 +53375,20 @@ var ts;
         }
         function canHaveConstantValue(node) {
             switch (node.kind) {
-                case 273:
-                case 185:
-                case 186:
+                case 273 /* EnumMember */:
+                case 185 /* PropertyAccessExpression */:
+                case 186 /* ElementAccessExpression */:
                     return true;
             }
             return false;
         }
         function getConstantValue(node) {
-            if (node.kind === 273) {
+            if (node.kind === 273 /* EnumMember */) {
                 return getEnumMemberValue(node);
             }
             var symbol = getNodeLinks(node).resolvedSymbol;
-            if (symbol && (symbol.flags & 8)) {
+            if (symbol && (symbol.flags & 8 /* EnumMember */)) {
+                // inline property\index accesses only for const enums
                 if (ts.isConstEnumDeclaration(symbol.valueDeclaration.parent)) {
                     return getEnumMemberValue(symbol.valueDeclaration);
                 }
@@ -42240,9 +53396,10 @@ var ts;
             return undefined;
         }
         function isFunctionType(type) {
-            return !!(type.flags & 131072) && getSignaturesOfType(type, 0).length > 0;
+            return !!(type.flags & 131072 /* Object */) && getSignaturesOfType(type, 0 /* Call */).length > 0;
         }
         function getTypeReferenceSerializationKind(typeNameIn, location) {
+            // ensure both `typeName` and `location` are parse tree nodes.
             var typeName = ts.getParseTreeNode(typeNameIn, ts.isEntityName);
             if (!typeName)
                 return ts.TypeReferenceSerializationKind.Unknown;
@@ -42251,10 +53408,12 @@ var ts;
                 if (!location)
                     return ts.TypeReferenceSerializationKind.Unknown;
             }
-            var valueSymbol = resolveEntityName(typeName, 67216319, true, false, location);
-            var typeSymbol = resolveEntityName(typeName, 67901928, true, false, location);
+            // Resolve the symbol as a value to ensure the type can be reached at runtime during emit.
+            var valueSymbol = resolveEntityName(typeName, 67216319 /* Value */, /*ignoreErrors*/ true, /*dontResolveAlias*/ false, location);
+            // Resolve the symbol as a type so that we can provide a more useful hint for the type serializer.
+            var typeSymbol = resolveEntityName(typeName, 67901928 /* Type */, /*ignoreErrors*/ true, /*dontResolveAlias*/ false, location);
             if (valueSymbol && valueSymbol === typeSymbol) {
-                var globalPromiseSymbol = getGlobalPromiseConstructorSymbol(false);
+                var globalPromiseSymbol = getGlobalPromiseConstructorSymbol(/*reportErrors*/ false);
                 if (globalPromiseSymbol && valueSymbol === globalPromiseSymbol) {
                     return ts.TypeReferenceSerializationKind.Promise;
                 }
@@ -42263,6 +53422,7 @@ var ts;
                     return ts.TypeReferenceSerializationKind.TypeWithConstructSignatureAndValue;
                 }
             }
+            // We might not be able to resolve type symbol so use unknown type in that case (eg error case)
             if (!typeSymbol) {
                 return ts.TypeReferenceSerializationKind.Unknown;
             }
@@ -42270,25 +53430,25 @@ var ts;
             if (type === errorType) {
                 return ts.TypeReferenceSerializationKind.Unknown;
             }
-            else if (type.flags & 3) {
+            else if (type.flags & 3 /* AnyOrUnknown */) {
                 return ts.TypeReferenceSerializationKind.ObjectType;
             }
-            else if (isTypeAssignableToKind(type, 4096 | 24576 | 32768)) {
+            else if (isTypeAssignableToKind(type, 4096 /* Void */ | 24576 /* Nullable */ | 32768 /* Never */)) {
                 return ts.TypeReferenceSerializationKind.VoidNullableOrNeverType;
             }
-            else if (isTypeAssignableToKind(type, 272)) {
+            else if (isTypeAssignableToKind(type, 272 /* BooleanLike */)) {
                 return ts.TypeReferenceSerializationKind.BooleanType;
             }
-            else if (isTypeAssignableToKind(type, 168)) {
+            else if (isTypeAssignableToKind(type, 168 /* NumberLike */)) {
                 return ts.TypeReferenceSerializationKind.NumberLikeType;
             }
-            else if (isTypeAssignableToKind(type, 68)) {
+            else if (isTypeAssignableToKind(type, 68 /* StringLike */)) {
                 return ts.TypeReferenceSerializationKind.StringLikeType;
             }
             else if (isTupleType(type)) {
                 return ts.TypeReferenceSerializationKind.ArrayLikeType;
             }
-            else if (isTypeAssignableToKind(type, 3072)) {
+            else if (isTypeAssignableToKind(type, 3072 /* ESSymbolLike */)) {
                 return ts.TypeReferenceSerializationKind.ESSymbolType;
             }
             else if (isFunctionType(type)) {
@@ -42304,36 +53464,37 @@ var ts;
         function createTypeOfDeclaration(declarationIn, enclosingDeclaration, flags, tracker, addUndefined) {
             var declaration = ts.getParseTreeNode(declarationIn, ts.isVariableLikeOrAccessor);
             if (!declaration) {
-                return ts.createToken(119);
+                return ts.createToken(119 /* AnyKeyword */);
             }
+            // Get type of the symbol if this is the valid symbol otherwise get type at location
             var symbol = getSymbolOfNode(declaration);
-            var type = symbol && !(symbol.flags & (2048 | 131072))
+            var type = symbol && !(symbol.flags & (2048 /* TypeLiteral */ | 131072 /* Signature */))
                 ? getWidenedLiteralType(getTypeOfSymbol(symbol))
                 : errorType;
-            if (type.flags & 2048 &&
+            if (type.flags & 2048 /* UniqueESSymbol */ &&
                 type.symbol === symbol) {
-                flags |= 1048576;
+                flags |= 1048576 /* AllowUniqueESSymbolType */;
             }
             if (addUndefined) {
                 type = getOptionalType(type);
             }
-            return nodeBuilder.typeToTypeNode(type, enclosingDeclaration, flags | 1024, tracker);
+            return nodeBuilder.typeToTypeNode(type, enclosingDeclaration, flags | 1024 /* MultilineObjectLiterals */, tracker);
         }
         function createReturnTypeOfSignatureDeclaration(signatureDeclarationIn, enclosingDeclaration, flags, tracker) {
             var signatureDeclaration = ts.getParseTreeNode(signatureDeclarationIn, ts.isFunctionLike);
             if (!signatureDeclaration) {
-                return ts.createToken(119);
+                return ts.createToken(119 /* AnyKeyword */);
             }
             var signature = getSignatureFromDeclaration(signatureDeclaration);
-            return nodeBuilder.typeToTypeNode(getReturnTypeOfSignature(signature), enclosingDeclaration, flags | 1024, tracker);
+            return nodeBuilder.typeToTypeNode(getReturnTypeOfSignature(signature), enclosingDeclaration, flags | 1024 /* MultilineObjectLiterals */, tracker);
         }
         function createTypeOfExpression(exprIn, enclosingDeclaration, flags, tracker) {
             var expr = ts.getParseTreeNode(exprIn, ts.isExpression);
             if (!expr) {
-                return ts.createToken(119);
+                return ts.createToken(119 /* AnyKeyword */);
             }
             var type = getWidenedType(getRegularTypeOfExpression(expr));
-            return nodeBuilder.typeToTypeNode(type, enclosingDeclaration, flags | 1024, tracker);
+            return nodeBuilder.typeToTypeNode(type, enclosingDeclaration, flags | 1024 /* MultilineObjectLiterals */, tracker);
         }
         function hasGlobalName(name) {
             return globals.has(ts.escapeLeadingUnderscores(name));
@@ -42345,12 +53506,14 @@ var ts;
             }
             var location = reference;
             if (startInDeclarationContainer) {
+                // When resolving the name of a declaration as a value, we need to start resolution
+                // at a point outside of the declaration.
                 var parent = reference.parent;
                 if (ts.isDeclaration(parent) && reference === parent.name) {
                     location = getDeclarationContainer(parent);
                 }
             }
-            return resolveName(location, reference.escapedText, 67216319 | 1048576 | 2097152, undefined, undefined, true);
+            return resolveName(location, reference.escapedText, 67216319 /* Value */ | 1048576 /* ExportValue */ | 2097152 /* Alias */, /*nodeNotFoundMessage*/ undefined, /*nameArg*/ undefined, /*isUse*/ true);
         }
         function getReferencedValueDeclaration(referenceIn) {
             if (!ts.isGeneratedIdentifier(referenceIn)) {
@@ -42367,7 +53530,7 @@ var ts;
         function isLiteralConstDeclaration(node) {
             if (ts.isConst(node)) {
                 var type = getTypeOfSymbol(getSymbolOfNode(node));
-                return !!(type.flags & 192 && type.flags & 33554432);
+                return !!(type.flags & 192 /* StringOrNumberLiteral */ && type.flags & 33554432 /* FreshLiteral */);
             }
             return false;
         }
@@ -42379,9 +53542,12 @@ var ts;
             return literalTypeToNode(type);
         }
         function createResolver() {
+            // this variable and functions that use it are deliberately moved here from the outer scope
+            // to avoid scope pollution
             var resolvedTypeReferenceDirectives = host.getResolvedTypeReferenceDirectives();
             var fileToDirective;
             if (resolvedTypeReferenceDirectives) {
+                // populate reverse mapping: file path -> type reference directive that was resolved to this file
                 fileToDirective = ts.createMap();
                 resolvedTypeReferenceDirectives.forEach(function (resolvedDirective, key) {
                     if (!resolvedDirective || !resolvedDirective.resolvedFileName) {
@@ -42398,11 +53564,13 @@ var ts;
                 isDeclarationWithCollidingName: isDeclarationWithCollidingName,
                 isValueAliasDeclaration: function (node) {
                     node = ts.getParseTreeNode(node);
+                    // Synthesized nodes are always treated like values.
                     return node ? isValueAliasDeclaration(node) : true;
                 },
                 hasGlobalName: hasGlobalName,
                 isReferencedAliasDeclaration: function (node, checkChildren) {
                     node = ts.getParseTreeNode(node);
+                    // Synthesized nodes are always treated as referenced.
                     return node ? isReferencedAliasDeclaration(node, checkChildren) : true;
                 },
                 getNodeCheckFlags: function (node) {
@@ -42437,17 +53605,17 @@ var ts;
                 isLateBound: function (nodeIn) {
                     var node = ts.getParseTreeNode(nodeIn, ts.isDeclaration);
                     var symbol = node && getSymbolOfNode(node);
-                    return !!(symbol && ts.getCheckFlags(symbol) & 1024);
+                    return !!(symbol && ts.getCheckFlags(symbol) & 1024 /* Late */);
                 },
                 getJsxFactoryEntity: function (location) { return location ? (getJsxNamespace(location), (ts.getSourceFileOfNode(location).localJsxFactory || _jsxFactoryEntity)) : _jsxFactoryEntity; },
                 getAllAccessorDeclarations: function (accessor) {
-                    accessor = ts.getParseTreeNode(accessor, ts.isGetOrSetAccessorDeclaration);
-                    var otherKind = accessor.kind === 157 ? 156 : 157;
+                    accessor = ts.getParseTreeNode(accessor, ts.isGetOrSetAccessorDeclaration); // TODO: GH#18217
+                    var otherKind = accessor.kind === 157 /* SetAccessor */ ? 156 /* GetAccessor */ : 157 /* SetAccessor */;
                     var otherAccessor = ts.getDeclarationOfKind(getSymbolOfNode(accessor), otherKind);
                     var firstAccessor = otherAccessor && (otherAccessor.pos < accessor.pos) ? otherAccessor : accessor;
                     var secondAccessor = otherAccessor && (otherAccessor.pos < accessor.pos) ? accessor : otherAccessor;
-                    var setAccessor = accessor.kind === 157 ? accessor : otherAccessor;
-                    var getAccessor = accessor.kind === 156 ? accessor : otherAccessor;
+                    var setAccessor = accessor.kind === 157 /* SetAccessor */ ? accessor : otherAccessor;
+                    var getAccessor = accessor.kind === 156 /* GetAccessor */ ? accessor : otherAccessor;
                     return {
                         firstAccessor: firstAccessor,
                         secondAccessor: secondAccessor,
@@ -42457,36 +53625,46 @@ var ts;
                 }
             };
             function isInHeritageClause(node) {
-                return node.parent && node.parent.kind === 207 && node.parent.parent && node.parent.parent.kind === 268;
+                return node.parent && node.parent.kind === 207 /* ExpressionWithTypeArguments */ && node.parent.parent && node.parent.parent.kind === 268 /* HeritageClause */;
             }
+            // defined here to avoid outer scope pollution
             function getTypeReferenceDirectivesForEntityName(node) {
+                // program does not have any files with type reference directives - bail out
                 if (!fileToDirective) {
                     return undefined;
                 }
-                var meaning = 67901928 | 1920;
-                if ((node.kind === 71 && isInTypeQuery(node)) || (node.kind === 185 && !isInHeritageClause(node))) {
-                    meaning = 67216319 | 1048576;
+                // property access can only be used as values, or types when within an expression with type arguments inside a heritage clause
+                // qualified names can only be used as types\namespaces
+                // identifiers are treated as values only if they appear in type queries
+                var meaning = 67901928 /* Type */ | 1920 /* Namespace */;
+                if ((node.kind === 71 /* Identifier */ && isInTypeQuery(node)) || (node.kind === 185 /* PropertyAccessExpression */ && !isInHeritageClause(node))) {
+                    meaning = 67216319 /* Value */ | 1048576 /* ExportValue */;
                 }
-                var symbol = resolveEntityName(node, meaning, true);
+                var symbol = resolveEntityName(node, meaning, /*ignoreErrors*/ true);
                 return symbol && symbol !== unknownSymbol ? getTypeReferenceDirectivesForSymbol(symbol, meaning) : undefined;
             }
+            // defined here to avoid outer scope pollution
             function getTypeReferenceDirectivesForSymbol(symbol, meaning) {
+                // program does not have any files with type reference directives - bail out
                 if (!fileToDirective) {
                     return undefined;
                 }
                 if (!isSymbolFromTypeDeclarationFile(symbol)) {
                     return undefined;
                 }
+                // check what declarations in the symbol can contribute to the target meaning
                 var typeReferenceDirectives;
                 for (var _i = 0, _a = symbol.declarations; _i < _a.length; _i++) {
                     var decl = _a[_i];
+                    // check meaning of the local symbol to see if declaration needs to be analyzed further
                     if (decl.symbol && decl.symbol.flags & meaning) {
-                        var file_5 = ts.getSourceFileOfNode(decl);
-                        var typeReferenceDirective = fileToDirective.get(file_5.path);
+                        var file = ts.getSourceFileOfNode(decl);
+                        var typeReferenceDirective = fileToDirective.get(file.path);
                         if (typeReferenceDirective) {
                             (typeReferenceDirectives || (typeReferenceDirectives = [])).push(typeReferenceDirective);
                         }
                         else {
+                            // found at least one entry that does not originate from type reference directive
                             return undefined;
                         }
                     }
@@ -42494,9 +53672,12 @@ var ts;
                 return typeReferenceDirectives;
             }
             function isSymbolFromTypeDeclarationFile(symbol) {
+                // bail out if symbol does not have associated declarations (i.e. this is transient symbol created for property in binding pattern)
                 if (!symbol.declarations) {
                     return false;
                 }
+                // walk the parent chain for symbols to make sure that top level parent symbol is in the global scope
+                // external modules cannot define or contribute to type declaration files
                 var current = symbol;
                 while (true) {
                     var parent = getParentOfSymbol(current);
@@ -42507,13 +53688,14 @@ var ts;
                         break;
                     }
                 }
-                if (current.valueDeclaration && current.valueDeclaration.kind === 274 && current.flags & 512) {
+                if (current.valueDeclaration && current.valueDeclaration.kind === 274 /* SourceFile */ && current.flags & 512 /* ValueModule */) {
                     return false;
                 }
+                // check that at least one declaration of top level symbol originates from type declaration file
                 for (var _i = 0, _a = symbol.declarations; _i < _a.length; _i++) {
                     var decl = _a[_i];
-                    var file_6 = ts.getSourceFileOfNode(decl);
-                    if (fileToDirective.has(file_6.path)) {
+                    var file = ts.getSourceFileOfNode(decl);
+                    if (fileToDirective.has(file.path)) {
                         return true;
                     }
                 }
@@ -42521,32 +53703,35 @@ var ts;
             }
         }
         function getExternalModuleFileFromDeclaration(declaration) {
-            var specifier = declaration.kind === 239 ? ts.tryCast(declaration.name, ts.isStringLiteral) : ts.getExternalModuleName(declaration);
-            var moduleSymbol = resolveExternalModuleNameWorker(specifier, specifier, undefined);
+            var specifier = declaration.kind === 239 /* ModuleDeclaration */ ? ts.tryCast(declaration.name, ts.isStringLiteral) : ts.getExternalModuleName(declaration);
+            var moduleSymbol = resolveExternalModuleNameWorker(specifier, specifier, /*moduleNotFoundError*/ undefined); // TODO: GH#18217
             if (!moduleSymbol) {
                 return undefined;
             }
-            return ts.getDeclarationOfKind(moduleSymbol, 274);
+            return ts.getDeclarationOfKind(moduleSymbol, 274 /* SourceFile */);
         }
         function initializeTypeChecker() {
+            // Bind all source files and propagate errors
             for (var _i = 0, _a = host.getSourceFiles(); _i < _a.length; _i++) {
-                var file_7 = _a[_i];
-                ts.bindSourceFile(file_7, compilerOptions);
+                var file = _a[_i];
+                ts.bindSourceFile(file, compilerOptions);
             }
+            // Initialize global symbol table
             var augmentations;
             for (var _b = 0, _c = host.getSourceFiles(); _b < _c.length; _b++) {
-                var file_8 = _c[_b];
-                if (!ts.isExternalOrCommonJsModule(file_8)) {
-                    mergeSymbolTable(globals, file_8.locals);
+                var file = _c[_b];
+                if (!ts.isExternalOrCommonJsModule(file)) {
+                    mergeSymbolTable(globals, file.locals);
                 }
-                if (file_8.patternAmbientModules && file_8.patternAmbientModules.length) {
-                    patternAmbientModules = ts.concatenate(patternAmbientModules, file_8.patternAmbientModules);
+                if (file.patternAmbientModules && file.patternAmbientModules.length) {
+                    patternAmbientModules = ts.concatenate(patternAmbientModules, file.patternAmbientModules);
                 }
-                if (file_8.moduleAugmentations.length) {
-                    (augmentations || (augmentations = [])).push(file_8.moduleAugmentations);
+                if (file.moduleAugmentations.length) {
+                    (augmentations || (augmentations = [])).push(file.moduleAugmentations);
                 }
-                if (file_8.symbol && file_8.symbol.globalExports) {
-                    var source = file_8.symbol.globalExports;
+                if (file.symbol && file.symbol.globalExports) {
+                    // Merge in UMD exports with first-in-wins semantics (see #9771)
+                    var source = file.symbol.globalExports;
                     source.forEach(function (sourceSymbol, id) {
                         if (!globals.has(id)) {
                             globals.set(id, sourceSymbol);
@@ -42554,7 +53739,15 @@ var ts;
                     });
                 }
             }
+            // We do global augmentations separately from module augmentations (and before creating global types) because they
+            //  1. Affect global types. We won't have the correct global types until global augmentations are merged. Also,
+            //  2. Module augmentation instantiation requires creating the type of a module, which, in turn, can require
+            //       checking for an export or property on the module (if export=) which, in turn, can fall back to the
+            //       apparent type of the module - either globalObjectType or globalFunctionType - which wouldn't exist if we
+            //       did module augmentations prior to finalizing the global types.
             if (augmentations) {
+                // merge _global_ module augmentations.
+                // this needs to be done after global symbol table is initialized to make sure that all ambient modules are indexed
                 for (var _d = 0, augmentations_1 = augmentations; _d < augmentations_1.length; _d++) {
                     var list = augmentations_1[_d];
                     for (var _e = 0, list_1 = list; _e < list_1.length; _e++) {
@@ -42565,26 +53758,31 @@ var ts;
                     }
                 }
             }
+            // Setup global builtins
             addToSymbolTable(globals, builtinGlobals, ts.Diagnostics.Declaration_name_conflicts_with_built_in_global_identifier_0);
             getSymbolLinks(undefinedSymbol).type = undefinedWideningType;
-            getSymbolLinks(argumentsSymbol).type = getGlobalType("IArguments", 0, true);
+            getSymbolLinks(argumentsSymbol).type = getGlobalType("IArguments", /*arity*/ 0, /*reportErrors*/ true);
             getSymbolLinks(unknownSymbol).type = errorType;
-            globalArrayType = getGlobalType("Array", 1, true);
-            globalObjectType = getGlobalType("Object", 0, true);
-            globalFunctionType = getGlobalType("Function", 0, true);
-            globalStringType = getGlobalType("String", 0, true);
-            globalNumberType = getGlobalType("Number", 0, true);
-            globalBooleanType = getGlobalType("Boolean", 0, true);
-            globalRegExpType = getGlobalType("RegExp", 0, true);
+            // Initialize special types
+            globalArrayType = getGlobalType("Array", /*arity*/ 1, /*reportErrors*/ true);
+            globalObjectType = getGlobalType("Object", /*arity*/ 0, /*reportErrors*/ true);
+            globalFunctionType = getGlobalType("Function", /*arity*/ 0, /*reportErrors*/ true);
+            globalStringType = getGlobalType("String", /*arity*/ 0, /*reportErrors*/ true);
+            globalNumberType = getGlobalType("Number", /*arity*/ 0, /*reportErrors*/ true);
+            globalBooleanType = getGlobalType("Boolean", /*arity*/ 0, /*reportErrors*/ true);
+            globalRegExpType = getGlobalType("RegExp", /*arity*/ 0, /*reportErrors*/ true);
             anyArrayType = createArrayType(anyType);
             autoArrayType = createArrayType(autoType);
             if (autoArrayType === emptyObjectType) {
+                // autoArrayType is used as a marker, so even if global Array type is not defined, it needs to be a unique type
                 autoArrayType = createAnonymousType(undefined, emptySymbols, ts.emptyArray, ts.emptyArray, undefined, undefined);
             }
-            globalReadonlyArrayType = getGlobalTypeOrUndefined("ReadonlyArray", 1);
+            globalReadonlyArrayType = getGlobalTypeOrUndefined("ReadonlyArray", /*arity*/ 1);
             anyReadonlyArrayType = globalReadonlyArrayType ? createTypeFromGenericGlobalType(globalReadonlyArrayType, [anyType]) : anyArrayType;
-            globalThisType = getGlobalTypeOrUndefined("ThisType", 1);
+            globalThisType = getGlobalTypeOrUndefined("ThisType", /*arity*/ 1);
             if (augmentations) {
+                // merge _nonglobal_ module augmentations.
+                // this needs to be done after global symbol table is initialized to make sure that all ambient modules are indexed
                 for (var _f = 0, augmentations_2 = augmentations; _f < augmentations_2.length; _f++) {
                     var list = augmentations_2[_f];
                     for (var _g = 0, list_2 = list; _g < list_2.length; _g++) {
@@ -42599,14 +53797,14 @@ var ts;
         function checkExternalEmitHelpers(location, helpers) {
             if ((requestedExternalEmitHelpers & helpers) !== helpers && compilerOptions.importHelpers) {
                 var sourceFile = ts.getSourceFileOfNode(location);
-                if (ts.isEffectiveExternalModule(sourceFile, compilerOptions) && !(location.flags & 4194304)) {
+                if (ts.isEffectiveExternalModule(sourceFile, compilerOptions) && !(location.flags & 4194304 /* Ambient */)) {
                     var helpersModule = resolveHelpersModule(sourceFile, location);
                     if (helpersModule !== unknownSymbol) {
                         var uncheckedHelpers = helpers & ~requestedExternalEmitHelpers;
-                        for (var helper = 1; helper <= 65536; helper <<= 1) {
+                        for (var helper = 1 /* FirstEmitHelper */; helper <= 65536 /* LastEmitHelper */; helper <<= 1) {
                             if (uncheckedHelpers & helper) {
                                 var name = getHelperName(helper);
-                                var symbol = getSymbol(helpersModule.exports, ts.escapeLeadingUnderscores(name), 67216319);
+                                var symbol = getSymbol(helpersModule.exports, ts.escapeLeadingUnderscores(name), 67216319 /* Value */);
                                 if (!symbol) {
                                     error(location, ts.Diagnostics.This_syntax_requires_an_imported_helper_named_1_but_module_0_has_no_exported_member_1, ts.externalHelpersModuleNameText, name);
                                 }
@@ -42619,23 +53817,23 @@ var ts;
         }
         function getHelperName(helper) {
             switch (helper) {
-                case 1: return "__extends";
-                case 2: return "__assign";
-                case 4: return "__rest";
-                case 8: return "__decorate";
-                case 16: return "__metadata";
-                case 32: return "__param";
-                case 64: return "__awaiter";
-                case 128: return "__generator";
-                case 256: return "__values";
-                case 512: return "__read";
-                case 1024: return "__spread";
-                case 2048: return "__await";
-                case 4096: return "__asyncGenerator";
-                case 8192: return "__asyncDelegator";
-                case 16384: return "__asyncValues";
-                case 32768: return "__exportStar";
-                case 65536: return "__makeTemplateObject";
+                case 1 /* Extends */: return "__extends";
+                case 2 /* Assign */: return "__assign";
+                case 4 /* Rest */: return "__rest";
+                case 8 /* Decorate */: return "__decorate";
+                case 16 /* Metadata */: return "__metadata";
+                case 32 /* Param */: return "__param";
+                case 64 /* Awaiter */: return "__awaiter";
+                case 128 /* Generator */: return "__generator";
+                case 256 /* Values */: return "__values";
+                case 512 /* Read */: return "__read";
+                case 1024 /* Spread */: return "__spread";
+                case 2048 /* Await */: return "__await";
+                case 4096 /* AsyncGenerator */: return "__asyncGenerator";
+                case 8192 /* AsyncDelegator */: return "__asyncDelegator";
+                case 16384 /* AsyncValues */: return "__asyncValues";
+                case 32768 /* ExportStar */: return "__exportStar";
+                case 65536 /* MakeTemplateObject */: return "__makeTemplateObject";
                 default: return ts.Debug.fail("Unrecognized helper");
             }
         }
@@ -42645,6 +53843,7 @@ var ts;
             }
             return externalHelpersModule;
         }
+        // GRAMMAR CHECKING
         function checkGrammarDecoratorsAndModifiers(node) {
             return checkGrammarDecorators(node) || checkGrammarModifiers(node);
         }
@@ -42653,14 +53852,14 @@ var ts;
                 return false;
             }
             if (!ts.nodeCanBeDecorated(node, node.parent, node.parent.parent)) {
-                if (node.kind === 154 && !ts.nodeIsPresent(node.body)) {
+                if (node.kind === 154 /* MethodDeclaration */ && !ts.nodeIsPresent(node.body)) {
                     return grammarErrorOnFirstToken(node, ts.Diagnostics.A_decorator_can_only_decorate_a_method_implementation_not_an_overload);
                 }
                 else {
                     return grammarErrorOnFirstToken(node, ts.Diagnostics.Decorators_are_not_valid_here);
                 }
             }
-            else if (node.kind === 156 || node.kind === 157) {
+            else if (node.kind === 156 /* GetAccessor */ || node.kind === 157 /* SetAccessor */) {
                 var accessors = ts.getAllAccessorDeclarations(node.parent.members, node);
                 if (accessors.firstAccessor.decorators && node === accessors.secondAccessor) {
                     return grammarErrorOnFirstToken(node, ts.Diagnostics.Decorators_cannot_be_applied_to_multiple_get_Slashset_accessors_of_the_same_name);
@@ -42674,44 +53873,44 @@ var ts;
                 return quickResult;
             }
             var lastStatic, lastDeclare, lastAsync, lastReadonly;
-            var flags = 0;
+            var flags = 0 /* None */;
             for (var _i = 0, _a = node.modifiers; _i < _a.length; _i++) {
                 var modifier = _a[_i];
-                if (modifier.kind !== 132) {
-                    if (node.kind === 151 || node.kind === 153) {
+                if (modifier.kind !== 132 /* ReadonlyKeyword */) {
+                    if (node.kind === 151 /* PropertySignature */ || node.kind === 153 /* MethodSignature */) {
                         return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_cannot_appear_on_a_type_member, ts.tokenToString(modifier.kind));
                     }
-                    if (node.kind === 160) {
+                    if (node.kind === 160 /* IndexSignature */) {
                         return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_cannot_appear_on_an_index_signature, ts.tokenToString(modifier.kind));
                     }
                 }
                 switch (modifier.kind) {
-                    case 76:
-                        if (node.kind !== 238 && node.parent.kind === 235) {
-                            return grammarErrorOnNode(node, ts.Diagnostics.A_class_member_cannot_have_the_0_keyword, ts.tokenToString(76));
+                    case 76 /* ConstKeyword */:
+                        if (node.kind !== 238 /* EnumDeclaration */ && node.parent.kind === 235 /* ClassDeclaration */) {
+                            return grammarErrorOnNode(node, ts.Diagnostics.A_class_member_cannot_have_the_0_keyword, ts.tokenToString(76 /* ConstKeyword */));
                         }
                         break;
-                    case 114:
-                    case 113:
-                    case 112:
+                    case 114 /* PublicKeyword */:
+                    case 113 /* ProtectedKeyword */:
+                    case 112 /* PrivateKeyword */:
                         var text = visibilityToString(ts.modifierToFlag(modifier.kind));
-                        if (flags & 28) {
+                        if (flags & 28 /* AccessibilityModifier */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics.Accessibility_modifier_already_seen);
                         }
-                        else if (flags & 32) {
+                        else if (flags & 32 /* Static */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_must_precede_1_modifier, text, "static");
                         }
-                        else if (flags & 64) {
+                        else if (flags & 64 /* Readonly */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_must_precede_1_modifier, text, "readonly");
                         }
-                        else if (flags & 256) {
+                        else if (flags & 256 /* Async */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_must_precede_1_modifier, text, "async");
                         }
-                        else if (node.parent.kind === 240 || node.parent.kind === 274) {
+                        else if (node.parent.kind === 240 /* ModuleBlock */ || node.parent.kind === 274 /* SourceFile */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_cannot_appear_on_a_module_or_namespace_element, text);
                         }
-                        else if (flags & 128) {
-                            if (modifier.kind === 112) {
+                        else if (flags & 128 /* Abstract */) {
+                            if (modifier.kind === 112 /* PrivateKeyword */) {
                                 return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_cannot_be_used_with_1_modifier, text, "abstract");
                             }
                             else {
@@ -42720,152 +53919,157 @@ var ts;
                         }
                         flags |= ts.modifierToFlag(modifier.kind);
                         break;
-                    case 115:
-                        if (flags & 32) {
+                    case 115 /* StaticKeyword */:
+                        if (flags & 32 /* Static */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_already_seen, "static");
                         }
-                        else if (flags & 64) {
+                        else if (flags & 64 /* Readonly */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_must_precede_1_modifier, "static", "readonly");
                         }
-                        else if (flags & 256) {
+                        else if (flags & 256 /* Async */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_must_precede_1_modifier, "static", "async");
                         }
-                        else if (node.parent.kind === 240 || node.parent.kind === 274) {
+                        else if (node.parent.kind === 240 /* ModuleBlock */ || node.parent.kind === 274 /* SourceFile */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_cannot_appear_on_a_module_or_namespace_element, "static");
                         }
-                        else if (node.kind === 149) {
+                        else if (node.kind === 149 /* Parameter */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_cannot_appear_on_a_parameter, "static");
                         }
-                        else if (flags & 128) {
+                        else if (flags & 128 /* Abstract */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_cannot_be_used_with_1_modifier, "static", "abstract");
                         }
-                        flags |= 32;
+                        flags |= 32 /* Static */;
                         lastStatic = modifier;
                         break;
-                    case 132:
-                        if (flags & 64) {
+                    case 132 /* ReadonlyKeyword */:
+                        if (flags & 64 /* Readonly */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_already_seen, "readonly");
                         }
-                        else if (node.kind !== 152 && node.kind !== 151 && node.kind !== 160 && node.kind !== 149) {
+                        else if (node.kind !== 152 /* PropertyDeclaration */ && node.kind !== 151 /* PropertySignature */ && node.kind !== 160 /* IndexSignature */ && node.kind !== 149 /* Parameter */) {
+                            // If node.kind === SyntaxKind.Parameter, checkParameter report an error if it's not a parameter property.
                             return grammarErrorOnNode(modifier, ts.Diagnostics.readonly_modifier_can_only_appear_on_a_property_declaration_or_index_signature);
                         }
-                        flags |= 64;
+                        flags |= 64 /* Readonly */;
                         lastReadonly = modifier;
                         break;
-                    case 84:
-                        if (flags & 1) {
+                    case 84 /* ExportKeyword */:
+                        if (flags & 1 /* Export */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_already_seen, "export");
                         }
-                        else if (flags & 2) {
+                        else if (flags & 2 /* Ambient */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_must_precede_1_modifier, "export", "declare");
                         }
-                        else if (flags & 128) {
+                        else if (flags & 128 /* Abstract */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_must_precede_1_modifier, "export", "abstract");
                         }
-                        else if (flags & 256) {
+                        else if (flags & 256 /* Async */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_must_precede_1_modifier, "export", "async");
                         }
-                        else if (node.parent.kind === 235) {
+                        else if (node.parent.kind === 235 /* ClassDeclaration */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_cannot_appear_on_a_class_element, "export");
                         }
-                        else if (node.kind === 149) {
+                        else if (node.kind === 149 /* Parameter */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_cannot_appear_on_a_parameter, "export");
                         }
-                        flags |= 1;
+                        flags |= 1 /* Export */;
                         break;
-                    case 79:
-                        var container = node.parent.kind === 274 ? node.parent : node.parent.parent;
-                        if (container.kind === 239 && !ts.isAmbientModule(container)) {
+                    case 79 /* DefaultKeyword */:
+                        var container = node.parent.kind === 274 /* SourceFile */ ? node.parent : node.parent.parent;
+                        if (container.kind === 239 /* ModuleDeclaration */ && !ts.isAmbientModule(container)) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics.A_default_export_can_only_be_used_in_an_ECMAScript_style_module);
                         }
-                        flags |= 512;
+                        flags |= 512 /* Default */;
                         break;
-                    case 124:
-                        if (flags & 2) {
+                    case 124 /* DeclareKeyword */:
+                        if (flags & 2 /* Ambient */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_already_seen, "declare");
                         }
-                        else if (flags & 256) {
+                        else if (flags & 256 /* Async */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_cannot_be_used_in_an_ambient_context, "async");
                         }
-                        else if (node.parent.kind === 235) {
+                        else if (node.parent.kind === 235 /* ClassDeclaration */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_cannot_appear_on_a_class_element, "declare");
                         }
-                        else if (node.kind === 149) {
+                        else if (node.kind === 149 /* Parameter */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_cannot_appear_on_a_parameter, "declare");
                         }
-                        else if ((node.parent.flags & 4194304) && node.parent.kind === 240) {
+                        else if ((node.parent.flags & 4194304 /* Ambient */) && node.parent.kind === 240 /* ModuleBlock */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics.A_declare_modifier_cannot_be_used_in_an_already_ambient_context);
                         }
-                        flags |= 2;
+                        flags |= 2 /* Ambient */;
                         lastDeclare = modifier;
                         break;
-                    case 117:
-                        if (flags & 128) {
+                    case 117 /* AbstractKeyword */:
+                        if (flags & 128 /* Abstract */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_already_seen, "abstract");
                         }
-                        if (node.kind !== 235) {
-                            if (node.kind !== 154 &&
-                                node.kind !== 152 &&
-                                node.kind !== 156 &&
-                                node.kind !== 157) {
+                        if (node.kind !== 235 /* ClassDeclaration */) {
+                            if (node.kind !== 154 /* MethodDeclaration */ &&
+                                node.kind !== 152 /* PropertyDeclaration */ &&
+                                node.kind !== 156 /* GetAccessor */ &&
+                                node.kind !== 157 /* SetAccessor */) {
                                 return grammarErrorOnNode(modifier, ts.Diagnostics.abstract_modifier_can_only_appear_on_a_class_method_or_property_declaration);
                             }
-                            if (!(node.parent.kind === 235 && ts.hasModifier(node.parent, 128))) {
+                            if (!(node.parent.kind === 235 /* ClassDeclaration */ && ts.hasModifier(node.parent, 128 /* Abstract */))) {
                                 return grammarErrorOnNode(modifier, ts.Diagnostics.Abstract_methods_can_only_appear_within_an_abstract_class);
                             }
-                            if (flags & 32) {
+                            if (flags & 32 /* Static */) {
                                 return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_cannot_be_used_with_1_modifier, "static", "abstract");
                             }
-                            if (flags & 8) {
+                            if (flags & 8 /* Private */) {
                                 return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_cannot_be_used_with_1_modifier, "private", "abstract");
                             }
                         }
-                        flags |= 128;
+                        flags |= 128 /* Abstract */;
                         break;
-                    case 120:
-                        if (flags & 256) {
+                    case 120 /* AsyncKeyword */:
+                        if (flags & 256 /* Async */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_already_seen, "async");
                         }
-                        else if (flags & 2 || node.parent.flags & 4194304) {
+                        else if (flags & 2 /* Ambient */ || node.parent.flags & 4194304 /* Ambient */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_cannot_be_used_in_an_ambient_context, "async");
                         }
-                        else if (node.kind === 149) {
+                        else if (node.kind === 149 /* Parameter */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_cannot_appear_on_a_parameter, "async");
                         }
-                        flags |= 256;
+                        flags |= 256 /* Async */;
                         lastAsync = modifier;
                         break;
                 }
             }
-            if (node.kind === 155) {
-                if (flags & 32) {
+            if (node.kind === 155 /* Constructor */) {
+                if (flags & 32 /* Static */) {
                     return grammarErrorOnNode(lastStatic, ts.Diagnostics._0_modifier_cannot_appear_on_a_constructor_declaration, "static");
                 }
-                if (flags & 128) {
-                    return grammarErrorOnNode(lastStatic, ts.Diagnostics._0_modifier_cannot_appear_on_a_constructor_declaration, "abstract");
+                if (flags & 128 /* Abstract */) {
+                    return grammarErrorOnNode(lastStatic, ts.Diagnostics._0_modifier_cannot_appear_on_a_constructor_declaration, "abstract"); // TODO: GH#18217
                 }
-                else if (flags & 256) {
+                else if (flags & 256 /* Async */) {
                     return grammarErrorOnNode(lastAsync, ts.Diagnostics._0_modifier_cannot_appear_on_a_constructor_declaration, "async");
                 }
-                else if (flags & 64) {
+                else if (flags & 64 /* Readonly */) {
                     return grammarErrorOnNode(lastReadonly, ts.Diagnostics._0_modifier_cannot_appear_on_a_constructor_declaration, "readonly");
                 }
                 return false;
             }
-            else if ((node.kind === 244 || node.kind === 243) && flags & 2) {
+            else if ((node.kind === 244 /* ImportDeclaration */ || node.kind === 243 /* ImportEqualsDeclaration */) && flags & 2 /* Ambient */) {
                 return grammarErrorOnNode(lastDeclare, ts.Diagnostics.A_0_modifier_cannot_be_used_with_an_import_declaration, "declare");
             }
-            else if (node.kind === 149 && (flags & 92) && ts.isBindingPattern(node.name)) {
+            else if (node.kind === 149 /* Parameter */ && (flags & 92 /* ParameterPropertyModifier */) && ts.isBindingPattern(node.name)) {
                 return grammarErrorOnNode(node, ts.Diagnostics.A_parameter_property_may_not_be_declared_using_a_binding_pattern);
             }
-            else if (node.kind === 149 && (flags & 92) && node.dotDotDotToken) {
+            else if (node.kind === 149 /* Parameter */ && (flags & 92 /* ParameterPropertyModifier */) && node.dotDotDotToken) {
                 return grammarErrorOnNode(node, ts.Diagnostics.A_parameter_property_cannot_be_declared_using_a_rest_parameter);
             }
-            if (flags & 256) {
+            if (flags & 256 /* Async */) {
                 return checkGrammarAsyncModifier(node, lastAsync);
             }
             return false;
         }
+        /**
+         * true | false: Early return this value from checkGrammarModifiers.
+         * undefined: Need to do full checking on the modifiers.
+         */
         function reportObviousModifierErrors(node) {
             return !node.modifiers
                 ? false
@@ -42875,38 +54079,38 @@ var ts;
         }
         function shouldReportBadModifier(node) {
             switch (node.kind) {
-                case 156:
-                case 157:
-                case 155:
-                case 152:
-                case 151:
-                case 154:
-                case 153:
-                case 160:
-                case 239:
-                case 244:
-                case 243:
-                case 250:
-                case 249:
-                case 192:
-                case 193:
-                case 149:
+                case 156 /* GetAccessor */:
+                case 157 /* SetAccessor */:
+                case 155 /* Constructor */:
+                case 152 /* PropertyDeclaration */:
+                case 151 /* PropertySignature */:
+                case 154 /* MethodDeclaration */:
+                case 153 /* MethodSignature */:
+                case 160 /* IndexSignature */:
+                case 239 /* ModuleDeclaration */:
+                case 244 /* ImportDeclaration */:
+                case 243 /* ImportEqualsDeclaration */:
+                case 250 /* ExportDeclaration */:
+                case 249 /* ExportAssignment */:
+                case 192 /* FunctionExpression */:
+                case 193 /* ArrowFunction */:
+                case 149 /* Parameter */:
                     return false;
                 default:
-                    if (node.parent.kind === 240 || node.parent.kind === 274) {
+                    if (node.parent.kind === 240 /* ModuleBlock */ || node.parent.kind === 274 /* SourceFile */) {
                         return false;
                     }
                     switch (node.kind) {
-                        case 234:
-                            return nodeHasAnyModifiersExcept(node, 120);
-                        case 235:
-                            return nodeHasAnyModifiersExcept(node, 117);
-                        case 236:
-                        case 214:
-                        case 237:
+                        case 234 /* FunctionDeclaration */:
+                            return nodeHasAnyModifiersExcept(node, 120 /* AsyncKeyword */);
+                        case 235 /* ClassDeclaration */:
+                            return nodeHasAnyModifiersExcept(node, 117 /* AbstractKeyword */);
+                        case 236 /* InterfaceDeclaration */:
+                        case 214 /* VariableStatement */:
+                        case 237 /* TypeAliasDeclaration */:
                             return true;
-                        case 238:
-                            return nodeHasAnyModifiersExcept(node, 76);
+                        case 238 /* EnumDeclaration */:
+                            return nodeHasAnyModifiersExcept(node, 76 /* ConstKeyword */);
                         default:
                             ts.Debug.fail();
                             return false;
@@ -42918,10 +54122,10 @@ var ts;
         }
         function checkGrammarAsyncModifier(node, asyncModifier) {
             switch (node.kind) {
-                case 154:
-                case 234:
-                case 192:
-                case 193:
+                case 154 /* MethodDeclaration */:
+                case 234 /* FunctionDeclaration */:
+                case 192 /* FunctionExpression */:
+                case 193 /* ArrowFunction */:
                     return false;
             }
             return grammarErrorOnNode(asyncModifier, ts.Diagnostics._0_modifier_cannot_be_used_here, "async");
@@ -42950,7 +54154,7 @@ var ts;
                     if (i !== (parameterCount - 1)) {
                         return grammarErrorOnNode(parameter.dotDotDotToken, ts.Diagnostics.A_rest_parameter_must_be_last_in_a_parameter_list);
                     }
-                    if (!(parameter.flags & 4194304)) {
+                    if (!(parameter.flags & 4194304 /* Ambient */)) { // Allow `...foo,` in ambient declarations; see GH#23070
                         checkGrammarForDisallowedTrailingComma(parameters, ts.Diagnostics.A_rest_parameter_or_binding_pattern_may_not_have_a_trailing_comma);
                     }
                     if (ts.isBindingPattern(parameter.name)) {
@@ -42975,6 +54179,7 @@ var ts;
             }
         }
         function checkGrammarFunctionLikeDeclaration(node) {
+            // Prevent cascading error by short-circuit
             var file = ts.getSourceFileOfNode(node);
             return checkGrammarDecoratorsAndModifiers(node) || checkGrammarTypeParameterList(node.typeParameters, file) ||
                 checkGrammarParameterList(node.parameters) || checkGrammarArrowFunction(node, file);
@@ -43017,12 +54222,12 @@ var ts;
             if (!parameter.type) {
                 return grammarErrorOnNode(parameter.name, ts.Diagnostics.An_index_signature_parameter_must_have_a_type_annotation);
             }
-            if (parameter.type.kind !== 137 && parameter.type.kind !== 134) {
+            if (parameter.type.kind !== 137 /* StringKeyword */ && parameter.type.kind !== 134 /* NumberKeyword */) {
                 var type = getTypeFromTypeNode(parameter.type);
-                if (type.flags & 4 || type.flags & 8) {
+                if (type.flags & 4 /* String */ || type.flags & 8 /* Number */) {
                     return grammarErrorOnNode(parameter.name, ts.Diagnostics.An_index_signature_parameter_type_cannot_be_a_type_alias_Consider_writing_0_Colon_1_Colon_2_instead, ts.getTextOfNode(parameter.name), typeToString(type), typeToString(getTypeFromTypeNode(node.type)));
                 }
-                if (type.flags & 262144 && allTypesAssignableToKind(type, 64, true)) {
+                if (type.flags & 262144 /* Union */ && allTypesAssignableToKind(type, 64 /* StringLiteral */, /*strict*/ true)) {
                     return grammarErrorOnNode(parameter.name, ts.Diagnostics.An_index_signature_parameter_type_cannot_be_a_union_type_Consider_using_a_mapped_object_type_instead);
                 }
                 return grammarErrorOnNode(parameter.name, ts.Diagnostics.An_index_signature_parameter_type_must_be_string_or_number);
@@ -43033,6 +54238,7 @@ var ts;
             return false;
         }
         function checkGrammarIndexSignature(node) {
+            // Prevent cascading error by short-circuit
             return checkGrammarDecoratorsAndModifiers(node) || checkGrammarIndexSignatureParameters(node);
         }
         function checkGrammarForAtLeastOneTypeArgument(node, typeArguments) {
@@ -43050,9 +54256,9 @@ var ts;
         }
         function checkGrammarForOmittedArgument(args) {
             if (args) {
-                for (var _i = 0, args_5 = args; _i < args_5.length; _i++) {
-                    var arg = args_5[_i];
-                    if (arg.kind === 206) {
+                for (var _i = 0, args_2 = args; _i < args_2.length; _i++) {
+                    var arg = args_2[_i];
+                    if (arg.kind === 206 /* OmittedExpression */) {
                         return grammarErrorAtPos(arg, arg.pos, 0, ts.Diagnostics.Argument_expression_expected);
                     }
                 }
@@ -43082,7 +54288,7 @@ var ts;
             if (!checkGrammarDecoratorsAndModifiers(node) && node.heritageClauses) {
                 for (var _i = 0, _a = node.heritageClauses; _i < _a.length; _i++) {
                     var heritageClause = _a[_i];
-                    if (heritageClause.token === 85) {
+                    if (heritageClause.token === 85 /* ExtendsKeyword */) {
                         if (seenExtendsClause) {
                             return grammarErrorOnFirstToken(heritageClause, ts.Diagnostics.extends_clause_already_seen);
                         }
@@ -43095,12 +54301,13 @@ var ts;
                         seenExtendsClause = true;
                     }
                     else {
-                        ts.Debug.assert(heritageClause.token === 108);
+                        ts.Debug.assert(heritageClause.token === 108 /* ImplementsKeyword */);
                         if (seenImplementsClause) {
                             return grammarErrorOnFirstToken(heritageClause, ts.Diagnostics.implements_clause_already_seen);
                         }
                         seenImplementsClause = true;
                     }
+                    // Grammar checking heritageClause inside class declaration
                     checkGrammarHeritageClause(heritageClause);
                 }
             }
@@ -43110,37 +54317,39 @@ var ts;
             if (node.heritageClauses) {
                 for (var _i = 0, _a = node.heritageClauses; _i < _a.length; _i++) {
                     var heritageClause = _a[_i];
-                    if (heritageClause.token === 85) {
+                    if (heritageClause.token === 85 /* ExtendsKeyword */) {
                         if (seenExtendsClause) {
                             return grammarErrorOnFirstToken(heritageClause, ts.Diagnostics.extends_clause_already_seen);
                         }
                         seenExtendsClause = true;
                     }
                     else {
-                        ts.Debug.assert(heritageClause.token === 108);
+                        ts.Debug.assert(heritageClause.token === 108 /* ImplementsKeyword */);
                         return grammarErrorOnFirstToken(heritageClause, ts.Diagnostics.Interface_declaration_cannot_have_implements_clause);
                     }
+                    // Grammar checking heritageClause inside class declaration
                     checkGrammarHeritageClause(heritageClause);
                 }
             }
             return false;
         }
         function checkGrammarComputedPropertyName(node) {
-            if (node.kind !== 147) {
+            // If node is not a computedPropertyName, just skip the grammar checking
+            if (node.kind !== 147 /* ComputedPropertyName */) {
                 return false;
             }
             var computedPropertyName = node;
-            if (computedPropertyName.expression.kind === 200 && computedPropertyName.expression.operatorToken.kind === 26) {
+            if (computedPropertyName.expression.kind === 200 /* BinaryExpression */ && computedPropertyName.expression.operatorToken.kind === 26 /* CommaToken */) {
                 return grammarErrorOnNode(computedPropertyName.expression, ts.Diagnostics.A_comma_expression_is_not_allowed_in_a_computed_property_name);
             }
             return false;
         }
         function checkGrammarForGenerator(node) {
             if (node.asteriskToken) {
-                ts.Debug.assert(node.kind === 234 ||
-                    node.kind === 192 ||
-                    node.kind === 154);
-                if (node.flags & 4194304) {
+                ts.Debug.assert(node.kind === 234 /* FunctionDeclaration */ ||
+                    node.kind === 192 /* FunctionExpression */ ||
+                    node.kind === 154 /* MethodDeclaration */);
+                if (node.flags & 4194304 /* Ambient */) {
                     return grammarErrorOnNode(node.asteriskToken, ts.Diagnostics.Generators_are_not_allowed_in_an_ambient_context);
                 }
                 if (!node.body) {
@@ -43152,43 +54361,64 @@ var ts;
             return !!questionToken && grammarErrorOnNode(questionToken, message);
         }
         function checkGrammarObjectLiteralExpression(node, inDestructuring) {
+            var Flags;
+            (function (Flags) {
+                Flags[Flags["Property"] = 1] = "Property";
+                Flags[Flags["GetAccessor"] = 2] = "GetAccessor";
+                Flags[Flags["SetAccessor"] = 4] = "SetAccessor";
+                Flags[Flags["GetOrSetAccessor"] = 6] = "GetOrSetAccessor";
+            })(Flags || (Flags = {}));
             var seen = ts.createUnderscoreEscapedMap();
             for (var _i = 0, _a = node.properties; _i < _a.length; _i++) {
                 var prop = _a[_i];
-                if (prop.kind === 272) {
+                if (prop.kind === 272 /* SpreadAssignment */) {
                     continue;
                 }
                 var name = prop.name;
-                if (name.kind === 147) {
+                if (name.kind === 147 /* ComputedPropertyName */) {
+                    // If the name is not a ComputedPropertyName, the grammar checking will skip it
                     checkGrammarComputedPropertyName(name);
                 }
-                if (prop.kind === 271 && !inDestructuring && prop.objectAssignmentInitializer) {
+                if (prop.kind === 271 /* ShorthandPropertyAssignment */ && !inDestructuring && prop.objectAssignmentInitializer) {
+                    // having objectAssignmentInitializer is only valid in ObjectAssignmentPattern
+                    // outside of destructuring it is a syntax error
                     return grammarErrorOnNode(prop.equalsToken, ts.Diagnostics.can_only_be_used_in_an_object_literal_property_inside_a_destructuring_assignment);
                 }
+                // Modifiers are never allowed on properties except for 'async' on a method declaration
                 if (prop.modifiers) {
-                    for (var _b = 0, _c = prop.modifiers; _b < _c.length; _b++) {
+                    for (var _b = 0, _c = prop.modifiers; _b < _c.length; _b++) { // TODO: GH#19955
                         var mod = _c[_b];
-                        if (mod.kind !== 120 || prop.kind !== 154) {
+                        if (mod.kind !== 120 /* AsyncKeyword */ || prop.kind !== 154 /* MethodDeclaration */) {
                             grammarErrorOnNode(mod, ts.Diagnostics._0_modifier_cannot_be_used_here, ts.getTextOfNode(mod));
                         }
                     }
                 }
+                // ECMA-262 11.1.5 Object Initializer
+                // If previous is not undefined then throw a SyntaxError exception if any of the following conditions are true
+                // a.This production is contained in strict code and IsDataDescriptor(previous) is true and
+                // IsDataDescriptor(propId.descriptor) is true.
+                //    b.IsDataDescriptor(previous) is true and IsAccessorDescriptor(propId.descriptor) is true.
+                //    c.IsAccessorDescriptor(previous) is true and IsDataDescriptor(propId.descriptor) is true.
+                //    d.IsAccessorDescriptor(previous) is true and IsAccessorDescriptor(propId.descriptor) is true
+                // and either both previous and propId.descriptor have[[Get]] fields or both previous and propId.descriptor have[[Set]] fields
                 var currentKind = void 0;
                 switch (prop.kind) {
-                    case 270:
-                    case 271:
+                    case 270 /* PropertyAssignment */:
+                    case 271 /* ShorthandPropertyAssignment */:
+                        // Grammar checking for computedPropertyName and shorthandPropertyAssignment
                         checkGrammarForInvalidQuestionMark(prop.questionToken, ts.Diagnostics.An_object_member_cannot_be_declared_optional);
-                        if (name.kind === 8) {
+                        if (name.kind === 8 /* NumericLiteral */) {
                             checkGrammarNumericLiteral(name);
                         }
-                    case 154:
-                        currentKind = 1;
+                    // falls through
+                    case 154 /* MethodDeclaration */:
+                        currentKind = 1 /* Property */;
                         break;
-                    case 156:
-                        currentKind = 2;
+                    case 156 /* GetAccessor */:
+                        currentKind = 2 /* GetAccessor */;
                         break;
-                    case 157:
-                        currentKind = 4;
+                    case 157 /* SetAccessor */:
+                        currentKind = 4 /* SetAccessor */;
                         break;
                     default:
                         throw ts.Debug.assertNever(prop, "Unexpected syntax kind:" + prop.kind);
@@ -43202,11 +54432,11 @@ var ts;
                     seen.set(effectiveName, currentKind);
                 }
                 else {
-                    if (currentKind === 1 && existingKind === 1) {
+                    if (currentKind === 1 /* Property */ && existingKind === 1 /* Property */) {
                         grammarErrorOnNode(name, ts.Diagnostics.Duplicate_identifier_0, ts.getTextOfNode(name));
                     }
-                    else if ((currentKind & 6) && (existingKind & 6)) {
-                        if (existingKind !== 6 && currentKind !== existingKind) {
+                    else if ((currentKind & 6 /* GetOrSetAccessor */) && (existingKind & 6 /* GetOrSetAccessor */)) {
+                        if (existingKind !== 6 /* GetOrSetAccessor */ && currentKind !== existingKind) {
                             seen.set(effectiveName, currentKind | existingKind);
                         }
                         else {
@@ -43224,7 +54454,7 @@ var ts;
             var seen = ts.createUnderscoreEscapedMap();
             for (var _i = 0, _a = node.attributes.properties; _i < _a.length; _i++) {
                 var attr = _a[_i];
-                if (attr.kind === 264) {
+                if (attr.kind === 264 /* JsxSpreadAttribute */) {
                     continue;
                 }
                 var name = attr.name, initializer = attr.initializer;
@@ -43234,7 +54464,7 @@ var ts;
                 else {
                     return grammarErrorOnNode(name, ts.Diagnostics.JSX_elements_cannot_have_multiple_attributes_with_the_same_name);
                 }
-                if (initializer && initializer.kind === 265 && !initializer.expression) {
+                if (initializer && initializer.kind === 265 /* JsxExpression */ && !initializer.expression) {
                     return grammarErrorOnNode(initializer, ts.Diagnostics.JSX_attributes_must_only_be_assigned_a_non_empty_expression);
                 }
             }
@@ -43243,33 +54473,40 @@ var ts;
             if (checkGrammarStatementInAmbientContext(forInOrOfStatement)) {
                 return true;
             }
-            if (forInOrOfStatement.kind === 222 && forInOrOfStatement.awaitModifier) {
-                if ((forInOrOfStatement.flags & 16384) === 0) {
+            if (forInOrOfStatement.kind === 222 /* ForOfStatement */ && forInOrOfStatement.awaitModifier) {
+                if ((forInOrOfStatement.flags & 16384 /* AwaitContext */) === 0 /* None */) {
                     return grammarErrorOnNode(forInOrOfStatement.awaitModifier, ts.Diagnostics.A_for_await_of_statement_is_only_allowed_within_an_async_function_or_async_generator);
                 }
             }
-            if (forInOrOfStatement.initializer.kind === 233) {
+            if (forInOrOfStatement.initializer.kind === 233 /* VariableDeclarationList */) {
                 var variableList = forInOrOfStatement.initializer;
                 if (!checkGrammarVariableDeclarationList(variableList)) {
                     var declarations = variableList.declarations;
+                    // declarations.length can be zero if there is an error in variable declaration in for-of or for-in
+                    // See http://www.ecma-international.org/ecma-262/6.0/#sec-for-in-and-for-of-statements for details
+                    // For example:
+                    //      var let = 10;
+                    //      for (let of [1,2,3]) {} // this is invalid ES6 syntax
+                    //      for (let in [1,2,3]) {} // this is invalid ES6 syntax
+                    // We will then want to skip on grammar checking on variableList declaration
                     if (!declarations.length) {
                         return false;
                     }
                     if (declarations.length > 1) {
-                        var diagnostic = forInOrOfStatement.kind === 221
+                        var diagnostic = forInOrOfStatement.kind === 221 /* ForInStatement */
                             ? ts.Diagnostics.Only_a_single_variable_declaration_is_allowed_in_a_for_in_statement
                             : ts.Diagnostics.Only_a_single_variable_declaration_is_allowed_in_a_for_of_statement;
                         return grammarErrorOnFirstToken(variableList.declarations[1], diagnostic);
                     }
                     var firstDeclaration = declarations[0];
                     if (firstDeclaration.initializer) {
-                        var diagnostic = forInOrOfStatement.kind === 221
+                        var diagnostic = forInOrOfStatement.kind === 221 /* ForInStatement */
                             ? ts.Diagnostics.The_variable_declaration_of_a_for_in_statement_cannot_have_an_initializer
                             : ts.Diagnostics.The_variable_declaration_of_a_for_of_statement_cannot_have_an_initializer;
                         return grammarErrorOnNode(firstDeclaration.name, diagnostic);
                     }
                     if (firstDeclaration.type) {
-                        var diagnostic = forInOrOfStatement.kind === 221
+                        var diagnostic = forInOrOfStatement.kind === 221 /* ForInStatement */
                             ? ts.Diagnostics.The_left_hand_side_of_a_for_in_statement_cannot_use_a_type_annotation
                             : ts.Diagnostics.The_left_hand_side_of_a_for_of_statement_cannot_use_a_type_annotation;
                         return grammarErrorOnNode(firstDeclaration, diagnostic);
@@ -43280,27 +54517,27 @@ var ts;
         }
         function checkGrammarAccessor(accessor) {
             var kind = accessor.kind;
-            if (languageVersion < 1) {
+            if (languageVersion < 1 /* ES5 */) {
                 return grammarErrorOnNode(accessor.name, ts.Diagnostics.Accessors_are_only_available_when_targeting_ECMAScript_5_and_higher);
             }
-            else if (accessor.flags & 4194304) {
+            else if (accessor.flags & 4194304 /* Ambient */) {
                 return grammarErrorOnNode(accessor.name, ts.Diagnostics.An_accessor_cannot_be_declared_in_an_ambient_context);
             }
-            else if (accessor.body === undefined && !ts.hasModifier(accessor, 128)) {
+            else if (accessor.body === undefined && !ts.hasModifier(accessor, 128 /* Abstract */)) {
                 return grammarErrorAtPos(accessor, accessor.end - 1, ";".length, ts.Diagnostics._0_expected, "{");
             }
-            else if (accessor.body && ts.hasModifier(accessor, 128)) {
+            else if (accessor.body && ts.hasModifier(accessor, 128 /* Abstract */)) {
                 return grammarErrorOnNode(accessor, ts.Diagnostics.An_abstract_accessor_cannot_have_an_implementation);
             }
             else if (accessor.typeParameters) {
                 return grammarErrorOnNode(accessor.name, ts.Diagnostics.An_accessor_cannot_have_type_parameters);
             }
             else if (!doesAccessorHaveCorrectParameterCount(accessor)) {
-                return grammarErrorOnNode(accessor.name, kind === 156 ?
+                return grammarErrorOnNode(accessor.name, kind === 156 /* GetAccessor */ ?
                     ts.Diagnostics.A_get_accessor_cannot_have_parameters :
                     ts.Diagnostics.A_set_accessor_must_have_exactly_one_parameter);
             }
-            else if (kind === 157) {
+            else if (kind === 157 /* SetAccessor */) {
                 if (accessor.type) {
                     return grammarErrorOnNode(accessor.name, ts.Diagnostics.A_set_accessor_cannot_have_a_return_type_annotation);
                 }
@@ -43319,41 +54556,45 @@ var ts;
             }
             return false;
         }
+        /** Does the accessor have the right number of parameters?
+         * A get accessor has no parameters or a single `this` parameter.
+         * A set accessor has one parameter or a `this` parameter and one more parameter.
+         */
         function doesAccessorHaveCorrectParameterCount(accessor) {
-            return getAccessorThisParameter(accessor) || accessor.parameters.length === (accessor.kind === 156 ? 0 : 1);
+            return getAccessorThisParameter(accessor) || accessor.parameters.length === (accessor.kind === 156 /* GetAccessor */ ? 0 : 1);
         }
         function getAccessorThisParameter(accessor) {
-            if (accessor.parameters.length === (accessor.kind === 156 ? 1 : 2)) {
+            if (accessor.parameters.length === (accessor.kind === 156 /* GetAccessor */ ? 1 : 2)) {
                 return ts.getThisParameter(accessor);
             }
         }
         function checkGrammarTypeOperatorNode(node) {
-            if (node.operator === 141) {
-                if (node.type.kind !== 138) {
-                    return grammarErrorOnNode(node.type, ts.Diagnostics._0_expected, ts.tokenToString(138));
+            if (node.operator === 141 /* UniqueKeyword */) {
+                if (node.type.kind !== 138 /* SymbolKeyword */) {
+                    return grammarErrorOnNode(node.type, ts.Diagnostics._0_expected, ts.tokenToString(138 /* SymbolKeyword */));
                 }
                 var parent = ts.walkUpParenthesizedTypes(node.parent);
                 switch (parent.kind) {
-                    case 232:
+                    case 232 /* VariableDeclaration */:
                         var decl = parent;
-                        if (decl.name.kind !== 71) {
+                        if (decl.name.kind !== 71 /* Identifier */) {
                             return grammarErrorOnNode(node, ts.Diagnostics.unique_symbol_types_may_not_be_used_on_a_variable_declaration_with_a_binding_name);
                         }
                         if (!ts.isVariableDeclarationInVariableStatement(decl)) {
                             return grammarErrorOnNode(node, ts.Diagnostics.unique_symbol_types_are_only_allowed_on_variables_in_a_variable_statement);
                         }
-                        if (!(decl.parent.flags & 2)) {
+                        if (!(decl.parent.flags & 2 /* Const */)) {
                             return grammarErrorOnNode(parent.name, ts.Diagnostics.A_variable_whose_type_is_a_unique_symbol_type_must_be_const);
                         }
                         break;
-                    case 152:
-                        if (!ts.hasModifier(parent, 32) ||
-                            !ts.hasModifier(parent, 64)) {
+                    case 152 /* PropertyDeclaration */:
+                        if (!ts.hasModifier(parent, 32 /* Static */) ||
+                            !ts.hasModifier(parent, 64 /* Readonly */)) {
                             return grammarErrorOnNode(parent.name, ts.Diagnostics.A_property_of_a_class_whose_type_is_a_unique_symbol_type_must_be_both_static_and_readonly);
                         }
                         break;
-                    case 151:
-                        if (!ts.hasModifier(parent, 64)) {
+                    case 151 /* PropertySignature */:
+                        if (!ts.hasModifier(parent, 64 /* Readonly */)) {
                             return grammarErrorOnNode(parent.name, ts.Diagnostics.A_property_of_an_interface_or_type_literal_whose_type_is_a_unique_symbol_type_must_be_readonly);
                         }
                         break;
@@ -43371,9 +54612,10 @@ var ts;
             if (checkGrammarFunctionLikeDeclaration(node)) {
                 return true;
             }
-            if (node.kind === 154) {
-                if (node.parent.kind === 184) {
-                    if (node.modifiers && !(node.modifiers.length === 1 && ts.first(node.modifiers).kind === 120)) {
+            if (node.kind === 154 /* MethodDeclaration */) {
+                if (node.parent.kind === 184 /* ObjectLiteralExpression */) {
+                    // We only disallow modifier on a method declaration if it is a property of object-literal-expression
+                    if (node.modifiers && !(node.modifiers.length === 1 && ts.first(node.modifiers).kind === 120 /* AsyncKeyword */)) {
                         return grammarErrorOnFirstToken(node, ts.Diagnostics.Modifiers_cannot_appear_here);
                     }
                     else if (checkGrammarForInvalidQuestionMark(node.questionToken, ts.Diagnostics.An_object_member_cannot_be_declared_optional)) {
@@ -43388,17 +54630,22 @@ var ts;
                 }
             }
             if (ts.isClassLike(node.parent)) {
-                if (node.flags & 4194304) {
+                // Technically, computed properties in ambient contexts is disallowed
+                // for property declarations and accessors too, not just methods.
+                // However, property declarations disallow computed names in general,
+                // and accessors are not allowed in ambient contexts in general,
+                // so this error only really matters for methods.
+                if (node.flags & 4194304 /* Ambient */) {
                     return checkGrammarForInvalidDynamicName(node.name, ts.Diagnostics.A_computed_property_name_in_an_ambient_context_must_refer_to_an_expression_whose_type_is_a_literal_type_or_a_unique_symbol_type);
                 }
-                else if (node.kind === 154 && !node.body) {
+                else if (node.kind === 154 /* MethodDeclaration */ && !node.body) {
                     return checkGrammarForInvalidDynamicName(node.name, ts.Diagnostics.A_computed_property_name_in_a_method_overload_must_refer_to_an_expression_whose_type_is_a_literal_type_or_a_unique_symbol_type);
                 }
             }
-            else if (node.parent.kind === 236) {
+            else if (node.parent.kind === 236 /* InterfaceDeclaration */) {
                 return checkGrammarForInvalidDynamicName(node.name, ts.Diagnostics.A_computed_property_name_in_an_interface_must_refer_to_an_expression_whose_type_is_a_literal_type_or_a_unique_symbol_type);
             }
-            else if (node.parent.kind === 166) {
+            else if (node.parent.kind === 166 /* TypeLiteral */) {
                 return checkGrammarForInvalidDynamicName(node.name, ts.Diagnostics.A_computed_property_name_in_a_type_literal_must_refer_to_an_expression_whose_type_is_a_literal_type_or_a_unique_symbol_type);
             }
         }
@@ -43409,23 +54656,27 @@ var ts;
                     return grammarErrorOnNode(node, ts.Diagnostics.Jump_target_cannot_cross_function_boundary);
                 }
                 switch (current.kind) {
-                    case 228:
+                    case 228 /* LabeledStatement */:
                         if (node.label && current.label.escapedText === node.label.escapedText) {
-                            var isMisplacedContinueLabel = node.kind === 223
-                                && !ts.isIterationStatement(current.statement, true);
+                            // found matching label - verify that label usage is correct
+                            // continue can only target labels that are on iteration statements
+                            var isMisplacedContinueLabel = node.kind === 223 /* ContinueStatement */
+                                && !ts.isIterationStatement(current.statement, /*lookInLabeledStatement*/ true);
                             if (isMisplacedContinueLabel) {
                                 return grammarErrorOnNode(node, ts.Diagnostics.A_continue_statement_can_only_jump_to_a_label_of_an_enclosing_iteration_statement);
                             }
                             return false;
                         }
                         break;
-                    case 227:
-                        if (node.kind === 224 && !node.label) {
+                    case 227 /* SwitchStatement */:
+                        if (node.kind === 224 /* BreakStatement */ && !node.label) {
+                            // unlabeled break within switch statement - ok
                             return false;
                         }
                         break;
                     default:
-                        if (ts.isIterationStatement(current, false) && !node.label) {
+                        if (ts.isIterationStatement(current, /*lookInLabeledStatement*/ false) && !node.label) {
+                            // unlabeled break or continue within iteration statement - ok
                             return false;
                         }
                         break;
@@ -43433,13 +54684,13 @@ var ts;
                 current = current.parent;
             }
             if (node.label) {
-                var message = node.kind === 224
+                var message = node.kind === 224 /* BreakStatement */
                     ? ts.Diagnostics.A_break_statement_can_only_jump_to_a_label_of_an_enclosing_statement
                     : ts.Diagnostics.A_continue_statement_can_only_jump_to_a_label_of_an_enclosing_iteration_statement;
                 return grammarErrorOnNode(node, message);
             }
             else {
-                var message = node.kind === 224
+                var message = node.kind === 224 /* BreakStatement */
                     ? ts.Diagnostics.A_break_statement_can_only_be_used_within_an_enclosing_iteration_or_switch_statement
                     : ts.Diagnostics.A_continue_statement_can_only_be_used_within_an_enclosing_iteration_statement;
                 return grammarErrorOnNode(node, message);
@@ -43452,25 +54703,26 @@ var ts;
                     return grammarErrorOnNode(node, ts.Diagnostics.A_rest_element_must_be_last_in_a_destructuring_pattern);
                 }
                 checkGrammarForDisallowedTrailingComma(elements, ts.Diagnostics.A_rest_parameter_or_binding_pattern_may_not_have_a_trailing_comma);
-                if (node.name.kind === 181 || node.name.kind === 180) {
+                if (node.name.kind === 181 /* ArrayBindingPattern */ || node.name.kind === 180 /* ObjectBindingPattern */) {
                     return grammarErrorOnNode(node.name, ts.Diagnostics.A_rest_element_cannot_contain_a_binding_pattern);
                 }
                 if (node.propertyName) {
                     return grammarErrorOnNode(node.name, ts.Diagnostics.A_rest_element_cannot_have_a_property_name);
                 }
                 if (node.initializer) {
+                    // Error on equals token which immediately precedes the initializer
                     return grammarErrorAtPos(node, node.initializer.pos - 1, 1, ts.Diagnostics.A_rest_element_cannot_have_an_initializer);
                 }
             }
         }
         function isStringOrNumberLiteralExpression(expr) {
-            return expr.kind === 9 || expr.kind === 8 ||
-                expr.kind === 198 && expr.operator === 38 &&
-                    expr.operand.kind === 8;
+            return expr.kind === 9 /* StringLiteral */ || expr.kind === 8 /* NumericLiteral */ ||
+                expr.kind === 198 /* PrefixUnaryExpression */ && expr.operator === 38 /* MinusToken */ &&
+                    expr.operand.kind === 8 /* NumericLiteral */;
         }
         function checkGrammarVariableDeclaration(node) {
-            if (node.parent.parent.kind !== 221 && node.parent.parent.kind !== 222) {
-                if (node.flags & 4194304) {
+            if (node.parent.parent.kind !== 221 /* ForInStatement */ && node.parent.parent.kind !== 222 /* ForOfStatement */) {
+                if (node.flags & 4194304 /* Ambient */) {
                     if (node.initializer) {
                         if (ts.isConst(node) && !node.type) {
                             if (!isStringOrNumberLiteralExpression(node.initializer)) {
@@ -43478,11 +54730,13 @@ var ts;
                             }
                         }
                         else {
+                            // Error on equals token which immediate precedes the initializer
                             var equalsTokenLength = "=".length;
                             return grammarErrorAtPos(node, node.initializer.pos - equalsTokenLength, equalsTokenLength, ts.Diagnostics.Initializers_are_not_allowed_in_ambient_contexts);
                         }
                     }
                     if (node.initializer && !(ts.isConst(node) && isStringOrNumberLiteralExpression(node.initializer))) {
+                        // Error on equals token which immediate precedes the initializer
                         var equalsTokenLength = "=".length;
                         return grammarErrorAtPos(node, node.initializer.pos - equalsTokenLength, equalsTokenLength, ts.Diagnostics.Initializers_are_not_allowed_in_ambient_contexts);
                     }
@@ -43496,18 +54750,24 @@ var ts;
                     }
                 }
             }
-            if (node.exclamationToken && (node.parent.parent.kind !== 214 || !node.type || node.initializer || node.flags & 4194304)) {
+            if (node.exclamationToken && (node.parent.parent.kind !== 214 /* VariableStatement */ || !node.type || node.initializer || node.flags & 4194304 /* Ambient */)) {
                 return grammarErrorOnNode(node.exclamationToken, ts.Diagnostics.A_definite_assignment_assertion_is_not_permitted_in_this_context);
             }
             if (compilerOptions.module !== ts.ModuleKind.ES2015 && compilerOptions.module !== ts.ModuleKind.ESNext && compilerOptions.module !== ts.ModuleKind.System && !compilerOptions.noEmit &&
-                !(node.parent.parent.flags & 4194304) && ts.hasModifier(node.parent.parent, 1)) {
+                !(node.parent.parent.flags & 4194304 /* Ambient */) && ts.hasModifier(node.parent.parent, 1 /* Export */)) {
                 checkESModuleMarker(node.name);
             }
             var checkLetConstNames = (ts.isLet(node) || ts.isConst(node));
+            // 1. LexicalDeclaration : LetOrConst BindingList ;
+            // It is a Syntax Error if the BoundNames of BindingList contains "let".
+            // 2. ForDeclaration: ForDeclaration : LetOrConst ForBinding
+            // It is a Syntax Error if the BoundNames of ForDeclaration contains "let".
+            // It is a SyntaxError if a VariableDeclaration or VariableDeclarationNoIn occurs within strict code
+            // and its Identifier is eval or arguments
             return checkLetConstNames && checkGrammarNameInLetOrConstDeclarations(node.name);
         }
         function checkESModuleMarker(name) {
-            if (name.kind === 71) {
+            if (name.kind === 71 /* Identifier */) {
                 if (ts.idText(name) === "__esModule") {
                     return grammarErrorOnNode(name, ts.Diagnostics.Identifier_expected_esModule_is_reserved_as_an_exported_marker_when_transforming_ECMAScript_modules);
                 }
@@ -43524,8 +54784,8 @@ var ts;
             return false;
         }
         function checkGrammarNameInLetOrConstDeclarations(name) {
-            if (name.kind === 71) {
-                if (name.originalKeywordKind === 110) {
+            if (name.kind === 71 /* Identifier */) {
+                if (name.originalKeywordKind === 110 /* LetKeyword */) {
                     return grammarErrorOnNode(name, ts.Diagnostics.let_is_not_allowed_to_be_used_as_a_name_in_let_or_const_declarations);
                 }
             }
@@ -43552,15 +54812,15 @@ var ts;
         }
         function allowLetAndConstDeclarations(parent) {
             switch (parent.kind) {
-                case 217:
-                case 218:
-                case 219:
-                case 226:
-                case 220:
-                case 221:
-                case 222:
+                case 217 /* IfStatement */:
+                case 218 /* DoStatement */:
+                case 219 /* WhileStatement */:
+                case 226 /* WithStatement */:
+                case 220 /* ForStatement */:
+                case 221 /* ForInStatement */:
+                case 222 /* ForOfStatement */:
                     return false;
-                case 228:
+                case 228 /* LabeledStatement */:
                     return allowLetAndConstDeclarations(parent.parent);
             }
             return true;
@@ -43578,12 +54838,12 @@ var ts;
         function checkGrammarMetaProperty(node) {
             var escapedText = node.name.escapedText;
             switch (node.keywordToken) {
-                case 94:
+                case 94 /* NewKeyword */:
                     if (escapedText !== "target") {
                         return grammarErrorOnNode(node.name, ts.Diagnostics._0_is_not_a_valid_meta_property_for_keyword_1_Did_you_mean_2, node.name.escapedText, ts.tokenToString(node.keywordToken), "target");
                     }
                     break;
-                case 91:
+                case 91 /* ImportKeyword */:
                     if (escapedText !== "meta") {
                         return grammarErrorOnNode(node.name, ts.Diagnostics._0_is_not_a_valid_meta_property_for_keyword_1_Did_you_mean_2, node.name.escapedText, ts.tokenToString(node.keywordToken), "meta");
                     }
@@ -43637,7 +54897,7 @@ var ts;
                     return true;
                 }
             }
-            else if (node.parent.kind === 236) {
+            else if (node.parent.kind === 236 /* InterfaceDeclaration */) {
                 if (checkGrammarForInvalidDynamicName(node.name, ts.Diagnostics.A_computed_property_name_in_an_interface_must_refer_to_an_expression_whose_type_is_a_literal_type_or_a_unique_symbol_type)) {
                     return true;
                 }
@@ -43645,7 +54905,7 @@ var ts;
                     return grammarErrorOnNode(node.initializer, ts.Diagnostics.An_interface_property_cannot_have_an_initializer);
                 }
             }
-            else if (node.parent.kind === 166) {
+            else if (node.parent.kind === 166 /* TypeLiteral */) {
                 if (checkGrammarForInvalidDynamicName(node.name, ts.Diagnostics.A_computed_property_name_in_a_type_literal_must_refer_to_an_expression_whose_type_is_a_literal_type_or_a_unique_symbol_type)) {
                     return true;
                 }
@@ -43653,23 +54913,35 @@ var ts;
                     return grammarErrorOnNode(node.initializer, ts.Diagnostics.A_type_literal_property_cannot_have_an_initializer);
                 }
             }
-            if (node.flags & 4194304 && node.initializer) {
+            if (node.flags & 4194304 /* Ambient */ && node.initializer) {
                 return grammarErrorOnFirstToken(node.initializer, ts.Diagnostics.Initializers_are_not_allowed_in_ambient_contexts);
             }
             if (ts.isPropertyDeclaration(node) && node.exclamationToken && (!ts.isClassLike(node.parent) || !node.type || node.initializer ||
-                node.flags & 4194304 || ts.hasModifier(node, 32 | 128))) {
+                node.flags & 4194304 /* Ambient */ || ts.hasModifier(node, 32 /* Static */ | 128 /* Abstract */))) {
                 return grammarErrorOnNode(node.exclamationToken, ts.Diagnostics.A_definite_assignment_assertion_is_not_permitted_in_this_context);
             }
         }
         function checkGrammarTopLevelElementForRequiredDeclareModifier(node) {
-            if (node.kind === 236 ||
-                node.kind === 237 ||
-                node.kind === 244 ||
-                node.kind === 243 ||
-                node.kind === 250 ||
-                node.kind === 249 ||
-                node.kind === 242 ||
-                ts.hasModifier(node, 2 | 1 | 512)) {
+            // A declare modifier is required for any top level .d.ts declaration except export=, export default, export as namespace
+            // interfaces and imports categories:
+            //
+            //  DeclarationElement:
+            //     ExportAssignment
+            //     export_opt   InterfaceDeclaration
+            //     export_opt   TypeAliasDeclaration
+            //     export_opt   ImportDeclaration
+            //     export_opt   ExternalImportDeclaration
+            //     export_opt   AmbientDeclaration
+            //
+            // TODO: The spec needs to be amended to reflect this grammar.
+            if (node.kind === 236 /* InterfaceDeclaration */ ||
+                node.kind === 237 /* TypeAliasDeclaration */ ||
+                node.kind === 244 /* ImportDeclaration */ ||
+                node.kind === 243 /* ImportEqualsDeclaration */ ||
+                node.kind === 250 /* ExportDeclaration */ ||
+                node.kind === 249 /* ExportAssignment */ ||
+                node.kind === 242 /* NamespaceExportDeclaration */ ||
+                ts.hasModifier(node, 2 /* Ambient */ | 1 /* Export */ | 512 /* Default */)) {
                 return false;
             }
             return grammarErrorOnFirstToken(node, ts.Diagnostics.A_declare_modifier_is_required_for_a_top_level_declaration_in_a_d_ts_file);
@@ -43677,7 +54949,7 @@ var ts;
         function checkGrammarTopLevelElementsForRequiredDeclareModifier(file) {
             for (var _i = 0, _a = file.statements; _i < _a.length; _i++) {
                 var decl = _a[_i];
-                if (ts.isDeclaration(decl) || decl.kind === 214) {
+                if (ts.isDeclaration(decl) || decl.kind === 214 /* VariableStatement */) {
                     if (checkGrammarTopLevelElementForRequiredDeclareModifier(decl)) {
                         return true;
                     }
@@ -43686,42 +54958,54 @@ var ts;
             return false;
         }
         function checkGrammarSourceFile(node) {
-            return !!(node.flags & 4194304) && checkGrammarTopLevelElementsForRequiredDeclareModifier(node);
+            return !!(node.flags & 4194304 /* Ambient */) && checkGrammarTopLevelElementsForRequiredDeclareModifier(node);
         }
         function checkGrammarStatementInAmbientContext(node) {
-            if (node.flags & 4194304) {
+            if (node.flags & 4194304 /* Ambient */) {
+                // An accessors is already reported about the ambient context
                 if (ts.isAccessor(node.parent)) {
                     return getNodeLinks(node).hasReportedStatementInAmbientContext = true;
                 }
+                // Find containing block which is either Block, ModuleBlock, SourceFile
                 var links = getNodeLinks(node);
                 if (!links.hasReportedStatementInAmbientContext && ts.isFunctionLike(node.parent)) {
                     return getNodeLinks(node).hasReportedStatementInAmbientContext = grammarErrorOnFirstToken(node, ts.Diagnostics.An_implementation_cannot_be_declared_in_ambient_contexts);
                 }
-                if (node.parent.kind === 213 || node.parent.kind === 240 || node.parent.kind === 274) {
+                // We are either parented by another statement, or some sort of block.
+                // If we're in a block, we only want to really report an error once
+                // to prevent noisiness.  So use a bit on the block to indicate if
+                // this has already been reported, and don't report if it has.
+                //
+                if (node.parent.kind === 213 /* Block */ || node.parent.kind === 240 /* ModuleBlock */ || node.parent.kind === 274 /* SourceFile */) {
                     var links_1 = getNodeLinks(node.parent);
+                    // Check if the containing block ever report this error
                     if (!links_1.hasReportedStatementInAmbientContext) {
                         return links_1.hasReportedStatementInAmbientContext = grammarErrorOnFirstToken(node, ts.Diagnostics.Statements_are_not_allowed_in_ambient_contexts);
                     }
                 }
                 else {
+                    // We must be parented by a statement.  If so, there's no need
+                    // to report the error as our parent will have already done it.
+                    // Debug.assert(isStatement(node.parent));
                 }
             }
             return false;
         }
         function checkGrammarNumericLiteral(node) {
-            if (node.numericLiteralFlags & 32) {
+            // Grammar checking
+            if (node.numericLiteralFlags & 32 /* Octal */) {
                 var diagnosticMessage = void 0;
-                if (languageVersion >= 1) {
+                if (languageVersion >= 1 /* ES5 */) {
                     diagnosticMessage = ts.Diagnostics.Octal_literals_are_not_available_when_targeting_ECMAScript_5_and_higher_Use_the_syntax_0;
                 }
-                else if (ts.isChildOfNodeWithKind(node, 178)) {
+                else if (ts.isChildOfNodeWithKind(node, 178 /* LiteralType */)) {
                     diagnosticMessage = ts.Diagnostics.Octal_literal_types_must_use_ES2015_syntax_Use_the_syntax_0;
                 }
-                else if (ts.isChildOfNodeWithKind(node, 273)) {
+                else if (ts.isChildOfNodeWithKind(node, 273 /* EnumMember */)) {
                     diagnosticMessage = ts.Diagnostics.Octal_literals_are_not_allowed_in_enums_members_initializer_Use_the_syntax_0;
                 }
                 if (diagnosticMessage) {
-                    var withMinus = ts.isPrefixUnaryExpression(node.parent) && node.parent.operator === 38;
+                    var withMinus = ts.isPrefixUnaryExpression(node.parent) && node.parent.operator === 38 /* MinusToken */;
                     var literal = (withMinus ? "-" : "") + "0o" + node.text;
                     return grammarErrorOnNode(withMinus ? node.parent : node, diagnosticMessage, literal);
                 }
@@ -43732,7 +55016,7 @@ var ts;
             var sourceFile = ts.getSourceFileOfNode(node);
             if (!hasParseDiagnostics(sourceFile)) {
                 var span = ts.getSpanOfTokenAtPosition(sourceFile, node.pos);
-                diagnostics.add(ts.createFileDiagnostic(sourceFile, ts.textSpanEnd(span), 0, message, arg0, arg1, arg2));
+                diagnostics.add(ts.createFileDiagnostic(sourceFile, ts.textSpanEnd(span), /*length*/ 0, message, arg0, arg1, arg2));
                 return true;
             }
             return false;
@@ -43741,6 +55025,7 @@ var ts;
             if (!ambientModulesCache) {
                 ambientModulesCache = [];
                 globals.forEach(function (global, sym) {
+                    // No need to `unescapeLeadingUnderscores`, an escaped symbol is never an ambient module.
                     if (ambientModuleSymbolRegex.test(sym)) {
                         ambientModulesCache.push(global);
                     }
@@ -43759,6 +55044,8 @@ var ts;
             if (nodeArguments.length !== 1) {
                 return grammarErrorOnNode(node, ts.Diagnostics.Dynamic_import_must_have_one_specifier_as_an_argument);
             }
+            // see: parseArgumentOrArrayLiteralElement...we use this function which parse arguments of callExpression to parse specifier for dynamic import.
+            // parseArgumentOrArrayLiteralElement allows spread element to be in an argument list which is not allowed as specifier in dynamic import.
             if (ts.isSpreadElement(nodeArguments[0])) {
                 return grammarErrorOnNode(nodeArguments[0], ts.Diagnostics.Specifier_of_dynamic_import_cannot_be_spread_element);
             }
@@ -43766,10 +55053,11 @@ var ts;
         }
     }
     ts.createTypeChecker = createTypeChecker;
+    /** Like 'isDeclarationName', but returns true for LHS of `import { x as y }` or `export { x as y }`. */
     function isDeclarationNameOrImportPropertyName(name) {
         switch (name.parent.kind) {
-            case 248:
-            case 252:
+            case 248 /* ImportSpecifier */:
+            case 252 /* ExportSpecifier */:
                 return ts.isIdentifier(name);
             default:
                 return ts.isDeclarationName(name);
@@ -43777,36 +55065,40 @@ var ts;
     }
     function isSomeImportDeclaration(decl) {
         switch (decl.kind) {
-            case 245:
-            case 243:
-            case 246:
-            case 248:
+            case 245 /* ImportClause */: // For default import
+            case 243 /* ImportEqualsDeclaration */:
+            case 246 /* NamespaceImport */:
+            case 248 /* ImportSpecifier */: // For rename import `x as y`
                 return true;
-            case 71:
-                return decl.parent.kind === 248;
+            case 71 /* Identifier */:
+                // For regular import, `decl` is an Identifier under the ImportSpecifier.
+                return decl.parent.kind === 248 /* ImportSpecifier */;
             default:
                 return false;
         }
     }
     var JsxNames;
     (function (JsxNames) {
+        // tslint:disable variable-name
         JsxNames.JSX = "JSX";
         JsxNames.IntrinsicElements = "IntrinsicElements";
         JsxNames.ElementClass = "ElementClass";
-        JsxNames.ElementAttributesPropertyNameContainer = "ElementAttributesProperty";
+        JsxNames.ElementAttributesPropertyNameContainer = "ElementAttributesProperty"; // TODO: Deprecate and remove support
         JsxNames.ElementChildrenAttributeNameContainer = "ElementChildrenAttribute";
         JsxNames.Element = "Element";
         JsxNames.IntrinsicAttributes = "IntrinsicAttributes";
         JsxNames.IntrinsicClassAttributes = "IntrinsicClassAttributes";
+        // tslint:enable variable-name
     })(JsxNames || (JsxNames = {}));
 })(ts || (ts = {}));
 var ts;
 (function (ts) {
     function createSynthesizedNode(kind) {
         var node = ts.createNode(kind, -1, -1);
-        node.flags |= 8;
+        node.flags |= 8 /* Synthesized */;
         return node;
     }
+    /* @internal */
     function updateNode(updated, original) {
         if (updated !== original) {
             setOriginalNode(updated, original);
@@ -43816,6 +55108,9 @@ var ts;
         return updated;
     }
     ts.updateNode = updateNode;
+    /**
+     * Make `elements` into a `NodeArray<T>`. If `elements` is `undefined`, returns an empty `NodeArray<T>`.
+     */
     function createNodeArray(elements, hasTrailingComma) {
         if (!elements || elements === ts.emptyArray) {
             elements = [];
@@ -43830,7 +55125,14 @@ var ts;
         return array;
     }
     ts.createNodeArray = createNodeArray;
+    /**
+     * Creates a shallow, memberwise clone of a node with no source map location.
+     */
+    /* @internal */
     function getSynthesizedClone(node) {
+        // We don't use "clone" from core.ts here, as we need to preserve the prototype chain of
+        // the original node. We also need to exclude specific properties and only include own-
+        // properties (to skip members already defined on the shared prototype).
         if (node === undefined) {
             return node;
         }
@@ -43863,20 +55165,20 @@ var ts;
     }
     ts.createLiteral = createLiteral;
     function createNumericLiteral(value) {
-        var node = createSynthesizedNode(8);
+        var node = createSynthesizedNode(8 /* NumericLiteral */);
         node.text = value;
         node.numericLiteralFlags = 0;
         return node;
     }
     ts.createNumericLiteral = createNumericLiteral;
     function createStringLiteral(text) {
-        var node = createSynthesizedNode(9);
+        var node = createSynthesizedNode(9 /* StringLiteral */);
         node.text = text;
         return node;
     }
     ts.createStringLiteral = createStringLiteral;
     function createRegularExpressionLiteral(text) {
-        var node = createSynthesizedNode(12);
+        var node = createSynthesizedNode(12 /* RegularExpressionLiteral */);
         node.text = text;
         return node;
     }
@@ -43887,10 +55189,10 @@ var ts;
         return node;
     }
     function createIdentifier(text, typeArguments) {
-        var node = createSynthesizedNode(71);
+        var node = createSynthesizedNode(71 /* Identifier */);
         node.escapedText = ts.escapeLeadingUnderscores(text);
-        node.originalKeywordKind = text ? ts.stringToToken(text) : 0;
-        node.autoGenerateFlags = 0;
+        node.originalKeywordKind = text ? ts.stringToToken(text) : 0 /* Unknown */;
+        node.autoGenerateFlags = 0 /* None */;
         node.autoGenerateId = 0;
         if (typeArguments) {
             node.typeArguments = createNodeArray(typeArguments);
@@ -43907,29 +55209,31 @@ var ts;
     var nextAutoGenerateId = 0;
     function createTempVariable(recordTempVariable, reservedInNestedScopes) {
         var name = createIdentifier("");
-        name.autoGenerateFlags = 1;
+        name.autoGenerateFlags = 1 /* Auto */;
         name.autoGenerateId = nextAutoGenerateId;
         nextAutoGenerateId++;
         if (recordTempVariable) {
             recordTempVariable(name);
         }
         if (reservedInNestedScopes) {
-            name.autoGenerateFlags |= 8;
+            name.autoGenerateFlags |= 8 /* ReservedInNestedScopes */;
         }
         return name;
     }
     ts.createTempVariable = createTempVariable;
+    /** Create a unique temporary variable for use in a loop. */
     function createLoopVariable() {
         var name = createIdentifier("");
-        name.autoGenerateFlags = 2;
+        name.autoGenerateFlags = 2 /* Loop */;
         name.autoGenerateId = nextAutoGenerateId;
         nextAutoGenerateId++;
         return name;
     }
     ts.createLoopVariable = createLoopVariable;
+    /** Create a unique name based on the supplied text. */
     function createUniqueName(text) {
         var name = createIdentifier(text);
-        name.autoGenerateFlags = 3;
+        name.autoGenerateFlags = 3 /* Unique */;
         name.autoGenerateId = nextAutoGenerateId;
         nextAutoGenerateId++;
         return name;
@@ -43937,95 +55241,100 @@ var ts;
     ts.createUniqueName = createUniqueName;
     function createOptimisticUniqueName(text) {
         var name = createIdentifier(text);
-        name.autoGenerateFlags = 3 | 16;
+        name.autoGenerateFlags = 3 /* Unique */ | 16 /* Optimistic */;
         name.autoGenerateId = nextAutoGenerateId;
         nextAutoGenerateId++;
         return name;
     }
     ts.createOptimisticUniqueName = createOptimisticUniqueName;
+    /** Create a unique name based on the supplied text. This does not consider names injected by the transformer. */
     function createFileLevelUniqueName(text) {
         var name = createOptimisticUniqueName(text);
-        name.autoGenerateFlags |= 32;
+        name.autoGenerateFlags |= 32 /* FileLevel */;
         return name;
     }
     ts.createFileLevelUniqueName = createFileLevelUniqueName;
     function getGeneratedNameForNode(node, flags) {
         var name = createIdentifier(ts.isIdentifier(node) ? ts.idText(node) : "");
-        name.autoGenerateFlags = 4 | flags;
+        name.autoGenerateFlags = 4 /* Node */ | flags;
         name.autoGenerateId = nextAutoGenerateId;
         name.original = node;
         nextAutoGenerateId++;
         return name;
     }
     ts.getGeneratedNameForNode = getGeneratedNameForNode;
+    // Punctuation
     function createToken(token) {
         return createSynthesizedNode(token);
     }
     ts.createToken = createToken;
+    // Reserved words
     function createSuper() {
-        return createSynthesizedNode(97);
+        return createSynthesizedNode(97 /* SuperKeyword */);
     }
     ts.createSuper = createSuper;
     function createThis() {
-        return createSynthesizedNode(99);
+        return createSynthesizedNode(99 /* ThisKeyword */);
     }
     ts.createThis = createThis;
     function createNull() {
-        return createSynthesizedNode(95);
+        return createSynthesizedNode(95 /* NullKeyword */);
     }
     ts.createNull = createNull;
     function createTrue() {
-        return createSynthesizedNode(101);
+        return createSynthesizedNode(101 /* TrueKeyword */);
     }
     ts.createTrue = createTrue;
     function createFalse() {
-        return createSynthesizedNode(86);
+        return createSynthesizedNode(86 /* FalseKeyword */);
     }
     ts.createFalse = createFalse;
+    // Modifiers
     function createModifier(kind) {
         return createToken(kind);
     }
     ts.createModifier = createModifier;
     function createModifiersFromModifierFlags(flags) {
         var result = [];
-        if (flags & 1) {
-            result.push(createModifier(84));
+        if (flags & 1 /* Export */) {
+            result.push(createModifier(84 /* ExportKeyword */));
         }
-        if (flags & 2) {
-            result.push(createModifier(124));
+        if (flags & 2 /* Ambient */) {
+            result.push(createModifier(124 /* DeclareKeyword */));
         }
-        if (flags & 512) {
-            result.push(createModifier(79));
+        if (flags & 512 /* Default */) {
+            result.push(createModifier(79 /* DefaultKeyword */));
         }
-        if (flags & 2048) {
-            result.push(createModifier(76));
+        if (flags & 2048 /* Const */) {
+            result.push(createModifier(76 /* ConstKeyword */));
         }
-        if (flags & 4) {
-            result.push(createModifier(114));
+        if (flags & 4 /* Public */) {
+            result.push(createModifier(114 /* PublicKeyword */));
         }
-        if (flags & 8) {
-            result.push(createModifier(112));
+        if (flags & 8 /* Private */) {
+            result.push(createModifier(112 /* PrivateKeyword */));
         }
-        if (flags & 16) {
-            result.push(createModifier(113));
+        if (flags & 16 /* Protected */) {
+            result.push(createModifier(113 /* ProtectedKeyword */));
         }
-        if (flags & 128) {
-            result.push(createModifier(117));
+        if (flags & 128 /* Abstract */) {
+            result.push(createModifier(117 /* AbstractKeyword */));
         }
-        if (flags & 32) {
-            result.push(createModifier(115));
+        if (flags & 32 /* Static */) {
+            result.push(createModifier(115 /* StaticKeyword */));
         }
-        if (flags & 64) {
-            result.push(createModifier(132));
+        if (flags & 64 /* Readonly */) {
+            result.push(createModifier(132 /* ReadonlyKeyword */));
         }
-        if (flags & 256) {
-            result.push(createModifier(120));
+        if (flags & 256 /* Async */) {
+            result.push(createModifier(120 /* AsyncKeyword */));
         }
         return result;
     }
     ts.createModifiersFromModifierFlags = createModifiersFromModifierFlags;
+    // Names
     function createQualifiedName(left, right) {
-        var node = createSynthesizedNode(146);
+        var node = createSynthesizedNode(146 /* QualifiedName */);
         node.left = left;
         node.right = asName(right);
         return node;
@@ -44039,13 +55348,13 @@ var ts;
     }
     ts.updateQualifiedName = updateQualifiedName;
     function parenthesizeForComputedName(expression) {
-        return (ts.isBinaryExpression(expression) && expression.operatorToken.kind === 26) ||
-            expression.kind === 302 ?
+        return (ts.isBinaryExpression(expression) && expression.operatorToken.kind === 26 /* CommaToken */) ||
+            expression.kind === 302 /* CommaListExpression */ ?
             createParen(expression) :
             expression;
     }
     function createComputedPropertyName(expression) {
-        var node = createSynthesizedNode(147);
+        var node = createSynthesizedNode(147 /* ComputedPropertyName */);
         node.expression = parenthesizeForComputedName(expression);
         return node;
     }
@@ -44056,8 +55365,9 @@ var ts;
             : node;
     }
     ts.updateComputedPropertyName = updateComputedPropertyName;
+    // Signature elements
     function createTypeParameterDeclaration(name, constraint, defaultType) {
-        var node = createSynthesizedNode(148);
+        var node = createSynthesizedNode(148 /* TypeParameter */);
         node.name = asName(name);
         node.constraint = constraint;
         node.default = defaultType;
@@ -44073,7 +55383,7 @@ var ts;
     }
     ts.updateTypeParameterDeclaration = updateTypeParameterDeclaration;
     function createParameter(decorators, modifiers, dotDotDotToken, name, questionToken, type, initializer) {
-        var node = createSynthesizedNode(149);
+        var node = createSynthesizedNode(149 /* Parameter */);
         node.decorators = asNodeArray(decorators);
         node.modifiers = asNodeArray(modifiers);
         node.dotDotDotToken = dotDotDotToken;
@@ -44097,7 +55407,7 @@ var ts;
     }
     ts.updateParameter = updateParameter;
     function createDecorator(expression) {
-        var node = createSynthesizedNode(150);
+        var node = createSynthesizedNode(150 /* Decorator */);
         node.expression = ts.parenthesizeForAccess(expression);
         return node;
     }
@@ -44108,8 +55418,9 @@ var ts;
             : node;
     }
     ts.updateDecorator = updateDecorator;
+    // Type Elements
     function createPropertySignature(modifiers, name, questionToken, type, initializer) {
-        var node = createSynthesizedNode(151);
+        var node = createSynthesizedNode(151 /* PropertySignature */);
         node.modifiers = asNodeArray(modifiers);
         node.name = asName(name);
         node.questionToken = questionToken;
@@ -44129,12 +55440,12 @@ var ts;
     }
     ts.updatePropertySignature = updatePropertySignature;
     function createProperty(decorators, modifiers, name, questionOrExclamationToken, type, initializer) {
-        var node = createSynthesizedNode(152);
+        var node = createSynthesizedNode(152 /* PropertyDeclaration */);
         node.decorators = asNodeArray(decorators);
         node.modifiers = asNodeArray(modifiers);
         node.name = asName(name);
-        node.questionToken = questionOrExclamationToken !== undefined && questionOrExclamationToken.kind === 55 ? questionOrExclamationToken : undefined;
-        node.exclamationToken = questionOrExclamationToken !== undefined && questionOrExclamationToken.kind === 51 ? questionOrExclamationToken : undefined;
+        node.questionToken = questionOrExclamationToken !== undefined && questionOrExclamationToken.kind === 55 /* QuestionToken */ ? questionOrExclamationToken : undefined;
+        node.exclamationToken = questionOrExclamationToken !== undefined && questionOrExclamationToken.kind === 51 /* ExclamationToken */ ? questionOrExclamationToken : undefined;
         node.type = type;
         node.initializer = initializer;
         return node;
@@ -44144,8 +55455,8 @@ var ts;
         return node.decorators !== decorators
             || node.modifiers !== modifiers
             || node.name !== name
-            || node.questionToken !== (questionOrExclamationToken !== undefined && questionOrExclamationToken.kind === 55 ? questionOrExclamationToken : undefined)
-            || node.exclamationToken !== (questionOrExclamationToken !== undefined && questionOrExclamationToken.kind === 51 ? questionOrExclamationToken : undefined)
+            || node.questionToken !== (questionOrExclamationToken !== undefined && questionOrExclamationToken.kind === 55 /* QuestionToken */ ? questionOrExclamationToken : undefined)
+            || node.exclamationToken !== (questionOrExclamationToken !== undefined && questionOrExclamationToken.kind === 51 /* ExclamationToken */ ? questionOrExclamationToken : undefined)
             || node.type !== type
             || node.initializer !== initializer
             ? updateNode(createProperty(decorators, modifiers, name, questionOrExclamationToken, type, initializer), node)
@@ -44153,7 +55464,7 @@ var ts;
     }
     ts.updateProperty = updateProperty;
     function createMethodSignature(typeParameters, parameters, type, name, questionToken) {
-        var node = createSignatureDeclaration(153, typeParameters, parameters, type);
+        var node = createSignatureDeclaration(153 /* MethodSignature */, typeParameters, parameters, type);
         node.name = asName(name);
         node.questionToken = questionToken;
         return node;
@@ -44170,7 +55481,7 @@ var ts;
     }
     ts.updateMethodSignature = updateMethodSignature;
     function createMethod(decorators, modifiers, asteriskToken, name, questionToken, typeParameters, parameters, type, body) {
-        var node = createSynthesizedNode(154);
+        var node = createSynthesizedNode(154 /* MethodDeclaration */);
         node.decorators = asNodeArray(decorators);
         node.modifiers = asNodeArray(modifiers);
         node.asteriskToken = asteriskToken;
@@ -44198,7 +55509,7 @@ var ts;
     }
     ts.updateMethod = updateMethod;
     function createConstructor(decorators, modifiers, parameters, body) {
-        var node = createSynthesizedNode(155);
+        var node = createSynthesizedNode(155 /* Constructor */);
         node.decorators = asNodeArray(decorators);
         node.modifiers = asNodeArray(modifiers);
         node.typeParameters = undefined;
@@ -44218,7 +55529,7 @@ var ts;
     }
     ts.updateConstructor = updateConstructor;
     function createGetAccessor(decorators, modifiers, name, parameters, type, body) {
-        var node = createSynthesizedNode(156);
+        var node = createSynthesizedNode(156 /* GetAccessor */);
         node.decorators = asNodeArray(decorators);
         node.modifiers = asNodeArray(modifiers);
         node.name = asName(name);
@@ -44241,7 +55552,7 @@ var ts;
     }
     ts.updateGetAccessor = updateGetAccessor;
     function createSetAccessor(decorators, modifiers, name, parameters, body) {
-        var node = createSynthesizedNode(157);
+        var node = createSynthesizedNode(157 /* SetAccessor */);
         node.decorators = asNodeArray(decorators);
         node.modifiers = asNodeArray(modifiers);
         node.name = asName(name);
@@ -44262,7 +55573,7 @@ var ts;
     }
     ts.updateSetAccessor = updateSetAccessor;
     function createCallSignature(typeParameters, parameters, type) {
-        return createSignatureDeclaration(158, typeParameters, parameters, type);
+        return createSignatureDeclaration(158 /* CallSignature */, typeParameters, parameters, type);
     }
     ts.createCallSignature = createCallSignature;
     function updateCallSignature(node, typeParameters, parameters, type) {
@@ -44270,7 +55581,7 @@ var ts;
     }
     ts.updateCallSignature = updateCallSignature;
     function createConstructSignature(typeParameters, parameters, type) {
-        return createSignatureDeclaration(159, typeParameters, parameters, type);
+        return createSignatureDeclaration(159 /* ConstructSignature */, typeParameters, parameters, type);
     }
     ts.createConstructSignature = createConstructSignature;
     function updateConstructSignature(node, typeParameters, parameters, type) {
@@ -44278,7 +55589,7 @@ var ts;
     }
     ts.updateConstructSignature = updateConstructSignature;
     function createIndexSignature(decorators, modifiers, parameters, type) {
-        var node = createSynthesizedNode(160);
+        var node = createSynthesizedNode(160 /* IndexSignature */);
         node.decorators = asNodeArray(decorators);
         node.modifiers = asNodeArray(modifiers);
         node.parameters = createNodeArray(parameters);
@@ -44295,6 +55606,7 @@ var ts;
             : node;
     }
     ts.updateIndexSignature = updateIndexSignature;
+    /* @internal */
     function createSignatureDeclaration(kind, typeParameters, parameters, type, typeArguments) {
         var node = createSynthesizedNode(kind);
         node.typeParameters = asNodeArray(typeParameters);
@@ -44311,12 +55623,13 @@ var ts;
             ? updateNode(createSignatureDeclaration(node.kind, typeParameters, parameters, type), node)
             : node;
     }
+    // Types
     function createKeywordTypeNode(kind) {
         return createSynthesizedNode(kind);
     }
     ts.createKeywordTypeNode = createKeywordTypeNode;
     function createTypePredicateNode(parameterName, type) {
-        var node = createSynthesizedNode(161);
+        var node = createSynthesizedNode(161 /* TypePredicate */);
         node.parameterName = asName(parameterName);
         node.type = type;
         return node;
@@ -44330,7 +55643,7 @@ var ts;
     }
     ts.updateTypePredicateNode = updateTypePredicateNode;
     function createTypeReferenceNode(typeName, typeArguments) {
-        var node = createSynthesizedNode(162);
+        var node = createSynthesizedNode(162 /* TypeReference */);
         node.typeName = asName(typeName);
         node.typeArguments = typeArguments && ts.parenthesizeTypeParameters(typeArguments);
         return node;
@@ -44344,7 +55657,7 @@ var ts;
     }
     ts.updateTypeReferenceNode = updateTypeReferenceNode;
     function createFunctionTypeNode(typeParameters, parameters, type) {
-        return createSignatureDeclaration(163, typeParameters, parameters, type);
+        return createSignatureDeclaration(163 /* FunctionType */, typeParameters, parameters, type);
     }
     ts.createFunctionTypeNode = createFunctionTypeNode;
     function updateFunctionTypeNode(node, typeParameters, parameters, type) {
@@ -44352,7 +55665,7 @@ var ts;
     }
     ts.updateFunctionTypeNode = updateFunctionTypeNode;
     function createConstructorTypeNode(typeParameters, parameters, type) {
-        return createSignatureDeclaration(164, typeParameters, parameters, type);
+        return createSignatureDeclaration(164 /* ConstructorType */, typeParameters, parameters, type);
     }
     ts.createConstructorTypeNode = createConstructorTypeNode;
     function updateConstructorTypeNode(node, typeParameters, parameters, type) {
@@ -44360,7 +55673,7 @@ var ts;
     }
     ts.updateConstructorTypeNode = updateConstructorTypeNode;
     function createTypeQueryNode(exprName) {
-        var node = createSynthesizedNode(165);
+        var node = createSynthesizedNode(165 /* TypeQuery */);
         node.exprName = exprName;
         return node;
     }
@@ -44372,7 +55685,7 @@ var ts;
     }
     ts.updateTypeQueryNode = updateTypeQueryNode;
     function createTypeLiteralNode(members) {
-        var node = createSynthesizedNode(166);
+        var node = createSynthesizedNode(166 /* TypeLiteral */);
         node.members = createNodeArray(members);
         return node;
     }
@@ -44384,7 +55697,7 @@ var ts;
     }
     ts.updateTypeLiteralNode = updateTypeLiteralNode;
     function createArrayTypeNode(elementType) {
-        var node = createSynthesizedNode(167);
+        var node = createSynthesizedNode(167 /* ArrayType */);
         node.elementType = ts.parenthesizeArrayTypeMember(elementType);
         return node;
     }
@@ -44396,7 +55709,7 @@ var ts;
     }
     ts.updateArrayTypeNode = updateArrayTypeNode;
     function createTupleTypeNode(elementTypes) {
-        var node = createSynthesizedNode(168);
+        var node = createSynthesizedNode(168 /* TupleType */);
         node.elementTypes = createNodeArray(elementTypes);
         return node;
     }
@@ -44408,7 +55721,7 @@ var ts;
     }
     ts.updateTypleTypeNode = updateTypleTypeNode;
     function createUnionTypeNode(types) {
-        return createUnionOrIntersectionTypeNode(169, types);
+        return createUnionOrIntersectionTypeNode(169 /* UnionType */, types);
     }
     ts.createUnionTypeNode = createUnionTypeNode;
     function updateUnionTypeNode(node, types) {
@@ -44416,7 +55729,7 @@ var ts;
     }
     ts.updateUnionTypeNode = updateUnionTypeNode;
     function createIntersectionTypeNode(types) {
-        return createUnionOrIntersectionTypeNode(170, types);
+        return createUnionOrIntersectionTypeNode(170 /* IntersectionType */, types);
     }
     ts.createIntersectionTypeNode = createIntersectionTypeNode;
     function updateIntersectionTypeNode(node, types) {
@@ -44435,7 +55748,7 @@ var ts;
             : node;
     }
     function createConditionalTypeNode(checkType, extendsType, trueType, falseType) {
-        var node = createSynthesizedNode(171);
+        var node = createSynthesizedNode(171 /* ConditionalType */);
         node.checkType = ts.parenthesizeConditionalTypeMember(checkType);
         node.extendsType = ts.parenthesizeConditionalTypeMember(extendsType);
         node.trueType = trueType;
@@ -44453,7 +55766,7 @@ var ts;
     }
     ts.updateConditionalTypeNode = updateConditionalTypeNode;
     function createInferTypeNode(typeParameter) {
-        var node = createSynthesizedNode(172);
+        var node = createSynthesizedNode(172 /* InferType */);
         node.typeParameter = typeParameter;
         return node;
     }
@@ -44465,7 +55778,7 @@ var ts;
     }
     ts.updateInferTypeNode = updateInferTypeNode;
     function createImportTypeNode(argument, qualifier, typeArguments, isTypeOf) {
-        var node = createSynthesizedNode(179);
+        var node = createSynthesizedNode(179 /* ImportType */);
         node.argument = argument;
         node.qualifier = qualifier;
         node.typeArguments = asNodeArray(typeArguments);
@@ -44483,7 +55796,7 @@ var ts;
     }
     ts.updateImportTypeNode = updateImportTypeNode;
     function createParenthesizedType(type) {
-        var node = createSynthesizedNode(173);
+        var node = createSynthesizedNode(173 /* ParenthesizedType */);
         node.type = type;
         return node;
     }
@@ -44495,12 +55808,12 @@ var ts;
     }
     ts.updateParenthesizedType = updateParenthesizedType;
     function createThisTypeNode() {
-        return createSynthesizedNode(174);
+        return createSynthesizedNode(174 /* ThisType */);
     }
     ts.createThisTypeNode = createThisTypeNode;
     function createTypeOperatorNode(operatorOrType, type) {
-        var node = createSynthesizedNode(175);
-        node.operator = typeof operatorOrType === "number" ? operatorOrType : 128;
+        var node = createSynthesizedNode(175 /* TypeOperator */);
+        node.operator = typeof operatorOrType === "number" ? operatorOrType : 128 /* KeyOfKeyword */;
         node.type = ts.parenthesizeElementTypeMember(typeof operatorOrType === "number" ? type : operatorOrType);
         return node;
     }
@@ -44510,7 +55823,7 @@ var ts;
     }
     ts.updateTypeOperatorNode = updateTypeOperatorNode;
     function createIndexedAccessTypeNode(objectType, indexType) {
-        var node = createSynthesizedNode(176);
+        var node = createSynthesizedNode(176 /* IndexedAccessType */);
         node.objectType = ts.parenthesizeElementTypeMember(objectType);
         node.indexType = indexType;
         return node;
@@ -44524,7 +55837,7 @@ var ts;
     }
     ts.updateIndexedAccessTypeNode = updateIndexedAccessTypeNode;
     function createMappedTypeNode(readonlyToken, typeParameter, questionToken, type) {
-        var node = createSynthesizedNode(177);
+        var node = createSynthesizedNode(177 /* MappedType */);
         node.readonlyToken = readonlyToken;
         node.typeParameter = typeParameter;
         node.questionToken = questionToken;
@@ -44542,7 +55855,7 @@ var ts;
     }
     ts.updateMappedTypeNode = updateMappedTypeNode;
     function createLiteralTypeNode(literal) {
-        var node = createSynthesizedNode(178);
+        var node = createSynthesizedNode(178 /* LiteralType */);
         node.literal = literal;
         return node;
     }
@@ -44553,8 +55866,9 @@ var ts;
             : node;
     }
     ts.updateLiteralTypeNode = updateLiteralTypeNode;
+    // Binding Patterns
     function createObjectBindingPattern(elements) {
-        var node = createSynthesizedNode(180);
+        var node = createSynthesizedNode(180 /* ObjectBindingPattern */);
         node.elements = createNodeArray(elements);
         return node;
     }
@@ -44566,7 +55880,7 @@ var ts;
     }
     ts.updateObjectBindingPattern = updateObjectBindingPattern;
     function createArrayBindingPattern(elements) {
-        var node = createSynthesizedNode(181);
+        var node = createSynthesizedNode(181 /* ArrayBindingPattern */);
         node.elements = createNodeArray(elements);
         return node;
     }
@@ -44578,7 +55892,7 @@ var ts;
     }
     ts.updateArrayBindingPattern = updateArrayBindingPattern;
     function createBindingElement(dotDotDotToken, propertyName, name, initializer) {
-        var node = createSynthesizedNode(182);
+        var node = createSynthesizedNode(182 /* BindingElement */);
         node.dotDotDotToken = dotDotDotToken;
         node.propertyName = asName(propertyName);
         node.name = asName(name);
@@ -44595,8 +55909,9 @@ var ts;
             : node;
     }
     ts.updateBindingElement = updateBindingElement;
+    // Expression
     function createArrayLiteral(elements, multiLine) {
-        var node = createSynthesizedNode(183);
+        var node = createSynthesizedNode(183 /* ArrayLiteralExpression */);
         node.elements = ts.parenthesizeListElements(createNodeArray(elements));
         if (multiLine)
             node.multiLine = true;
@@ -44610,7 +55925,7 @@ var ts;
     }
     ts.updateArrayLiteral = updateArrayLiteral;
     function createObjectLiteral(properties, multiLine) {
-        var node = createSynthesizedNode(184);
+        var node = createSynthesizedNode(184 /* ObjectLiteralExpression */);
         node.properties = createNodeArray(properties);
         if (multiLine)
             node.multiLine = true;
@@ -44624,14 +55939,16 @@ var ts;
     }
     ts.updateObjectLiteral = updateObjectLiteral;
     function createPropertyAccess(expression, name) {
-        var node = createSynthesizedNode(185);
+        var node = createSynthesizedNode(185 /* PropertyAccessExpression */);
         node.expression = ts.parenthesizeForAccess(expression);
-        node.name = asName(name);
-        setEmitFlags(node, 131072);
+        node.name = asName(name); // TODO: GH#18217
+        setEmitFlags(node, 131072 /* NoIndentation */);
         return node;
     }
     ts.createPropertyAccess = createPropertyAccess;
     function updatePropertyAccess(node, expression, name) {
+        // Because we are updating existed propertyAccess we want to inherit its emitFlags
+        // instead of using the default from createPropertyAccess
         return node.expression !== expression
             || node.name !== name
             ? updateNode(setEmitFlags(createPropertyAccess(expression, name), ts.getEmitFlags(node)), node)
@@ -44639,7 +55956,7 @@ var ts;
     }
     ts.updatePropertyAccess = updatePropertyAccess;
     function createElementAccess(expression, index) {
-        var node = createSynthesizedNode(186);
+        var node = createSynthesizedNode(186 /* ElementAccessExpression */);
         node.expression = ts.parenthesizeForAccess(expression);
         node.argumentExpression = asExpression(index);
         return node;
@@ -44653,7 +55970,7 @@ var ts;
     }
     ts.updateElementAccess = updateElementAccess;
     function createCall(expression, typeArguments, argumentsArray) {
-        var node = createSynthesizedNode(187);
+        var node = createSynthesizedNode(187 /* CallExpression */);
         node.expression = ts.parenthesizeForAccess(expression);
         node.typeArguments = asNodeArray(typeArguments);
         node.arguments = ts.parenthesizeListElements(createNodeArray(argumentsArray));
@@ -44669,7 +55986,7 @@ var ts;
     }
     ts.updateCall = updateCall;
     function createNew(expression, typeArguments, argumentsArray) {
-        var node = createSynthesizedNode(188);
+        var node = createSynthesizedNode(188 /* NewExpression */);
         node.expression = ts.parenthesizeForNew(expression);
         node.typeArguments = asNodeArray(typeArguments);
         node.arguments = argumentsArray ? ts.parenthesizeListElements(createNodeArray(argumentsArray)) : undefined;
@@ -44685,7 +56002,7 @@ var ts;
     }
     ts.updateNew = updateNew;
     function createTaggedTemplate(tag, typeArgumentsOrTemplate, template) {
-        var node = createSynthesizedNode(189);
+        var node = createSynthesizedNode(189 /* TaggedTemplateExpression */);
         node.tag = ts.parenthesizeForAccess(tag);
         if (template) {
             node.typeArguments = asNodeArray(typeArgumentsOrTemplate);
@@ -44708,7 +56025,7 @@ var ts;
     }
     ts.updateTaggedTemplate = updateTaggedTemplate;
     function createTypeAssertion(type, expression) {
-        var node = createSynthesizedNode(190);
+        var node = createSynthesizedNode(190 /* TypeAssertionExpression */);
         node.type = type;
         node.expression = ts.parenthesizePrefixOperand(expression);
         return node;
@@ -44722,7 +56039,7 @@ var ts;
     }
     ts.updateTypeAssertion = updateTypeAssertion;
     function createParen(expression) {
-        var node = createSynthesizedNode(191);
+        var node = createSynthesizedNode(191 /* ParenthesizedExpression */);
         node.expression = expression;
         return node;
     }
@@ -44734,7 +56051,7 @@ var ts;
     }
     ts.updateParen = updateParen;
     function createFunctionExpression(modifiers, asteriskToken, name, typeParameters, parameters, type, body) {
-        var node = createSynthesizedNode(192);
+        var node = createSynthesizedNode(192 /* FunctionExpression */);
         node.modifiers = asNodeArray(modifiers);
         node.asteriskToken = asteriskToken;
         node.name = asName(name);
@@ -44758,12 +56075,12 @@ var ts;
     }
     ts.updateFunctionExpression = updateFunctionExpression;
     function createArrowFunction(modifiers, typeParameters, parameters, type, equalsGreaterThanToken, body) {
-        var node = createSynthesizedNode(193);
+        var node = createSynthesizedNode(193 /* ArrowFunction */);
         node.modifiers = asNodeArray(modifiers);
         node.typeParameters = asNodeArray(typeParameters);
         node.parameters = createNodeArray(parameters);
         node.type = type;
-        node.equalsGreaterThanToken = equalsGreaterThanToken || createToken(36);
+        node.equalsGreaterThanToken = equalsGreaterThanToken || createToken(36 /* EqualsGreaterThanToken */);
         node.body = ts.parenthesizeConciseBody(body);
         return node;
     }
@@ -44777,7 +56094,7 @@ var ts;
         }
         else {
             equalsGreaterThanToken = ts.cast(equalsGreaterThanTokenOrBody, function (n) {
-                return n.kind === 36;
+                return n.kind === 36 /* EqualsGreaterThanToken */;
             });
             body = bodyOrUndefined;
         }
@@ -44792,7 +56109,7 @@ var ts;
     }
     ts.updateArrowFunction = updateArrowFunction;
     function createDelete(expression) {
-        var node = createSynthesizedNode(194);
+        var node = createSynthesizedNode(194 /* DeleteExpression */);
         node.expression = ts.parenthesizePrefixOperand(expression);
         return node;
     }
@@ -44804,7 +56121,7 @@ var ts;
     }
     ts.updateDelete = updateDelete;
     function createTypeOf(expression) {
-        var node = createSynthesizedNode(195);
+        var node = createSynthesizedNode(195 /* TypeOfExpression */);
         node.expression = ts.parenthesizePrefixOperand(expression);
         return node;
     }
@@ -44816,7 +56133,7 @@ var ts;
     }
     ts.updateTypeOf = updateTypeOf;
     function createVoid(expression) {
-        var node = createSynthesizedNode(196);
+        var node = createSynthesizedNode(196 /* VoidExpression */);
         node.expression = ts.parenthesizePrefixOperand(expression);
         return node;
     }
@@ -44828,7 +56145,7 @@ var ts;
     }
     ts.updateVoid = updateVoid;
     function createAwait(expression) {
-        var node = createSynthesizedNode(197);
+        var node = createSynthesizedNode(197 /* AwaitExpression */);
         node.expression = ts.parenthesizePrefixOperand(expression);
         return node;
     }
@@ -44840,7 +56157,7 @@ var ts;
     }
     ts.updateAwait = updateAwait;
     function createPrefix(operator, operand) {
-        var node = createSynthesizedNode(198);
+        var node = createSynthesizedNode(198 /* PrefixUnaryExpression */);
         node.operator = operator;
         node.operand = ts.parenthesizePrefixOperand(operand);
         return node;
@@ -44853,7 +56170,7 @@ var ts;
     }
     ts.updatePrefix = updatePrefix;
     function createPostfix(operand, operator) {
-        var node = createSynthesizedNode(199);
+        var node = createSynthesizedNode(199 /* PostfixUnaryExpression */);
         node.operand = ts.parenthesizePostfixOperand(operand);
         node.operator = operator;
         return node;
@@ -44866,12 +56183,12 @@ var ts;
     }
     ts.updatePostfix = updatePostfix;
     function createBinary(left, operator, right) {
-        var node = createSynthesizedNode(200);
+        var node = createSynthesizedNode(200 /* BinaryExpression */);
         var operatorToken = asToken(operator);
         var operatorKind = operatorToken.kind;
-        node.left = ts.parenthesizeBinaryOperand(operatorKind, left, true, undefined);
+        node.left = ts.parenthesizeBinaryOperand(operatorKind, left, /*isLeftSideOfBinary*/ true, /*leftOperand*/ undefined);
         node.operatorToken = operatorToken;
-        node.right = ts.parenthesizeBinaryOperand(operatorKind, right, false, node.left);
+        node.right = ts.parenthesizeBinaryOperand(operatorKind, right, /*isLeftSideOfBinary*/ false, node.left);
         return node;
     }
     ts.createBinary = createBinary;
@@ -44883,11 +56200,11 @@ var ts;
     }
     ts.updateBinary = updateBinary;
     function createConditional(condition, questionTokenOrWhenTrue, whenTrueOrWhenFalse, colonToken, whenFalse) {
-        var node = createSynthesizedNode(201);
+        var node = createSynthesizedNode(201 /* ConditionalExpression */);
         node.condition = ts.parenthesizeForConditionalHead(condition);
-        node.questionToken = whenFalse ? questionTokenOrWhenTrue : createToken(55);
+        node.questionToken = whenFalse ? questionTokenOrWhenTrue : createToken(55 /* QuestionToken */);
         node.whenTrue = ts.parenthesizeSubexpressionOfConditionalExpression(whenFalse ? whenTrueOrWhenFalse : questionTokenOrWhenTrue);
-        node.colonToken = whenFalse ? colonToken : createToken(56);
+        node.colonToken = whenFalse ? colonToken : createToken(56 /* ColonToken */);
         node.whenFalse = ts.parenthesizeSubexpressionOfConditionalExpression(whenFalse ? whenFalse : whenTrueOrWhenFalse);
         return node;
     }
@@ -44913,7 +56230,7 @@ var ts;
     }
     ts.updateConditional = updateConditional;
     function createTemplateExpression(head, templateSpans) {
-        var node = createSynthesizedNode(202);
+        var node = createSynthesizedNode(202 /* TemplateExpression */);
         node.head = head;
         node.templateSpans = createNodeArray(templateSpans);
         return node;
@@ -44927,33 +56244,33 @@ var ts;
     }
     ts.updateTemplateExpression = updateTemplateExpression;
     function createTemplateHead(text) {
-        var node = createSynthesizedNode(14);
+        var node = createSynthesizedNode(14 /* TemplateHead */);
         node.text = text;
         return node;
     }
     ts.createTemplateHead = createTemplateHead;
     function createTemplateMiddle(text) {
-        var node = createSynthesizedNode(15);
+        var node = createSynthesizedNode(15 /* TemplateMiddle */);
         node.text = text;
         return node;
     }
     ts.createTemplateMiddle = createTemplateMiddle;
     function createTemplateTail(text) {
-        var node = createSynthesizedNode(16);
+        var node = createSynthesizedNode(16 /* TemplateTail */);
         node.text = text;
         return node;
     }
     ts.createTemplateTail = createTemplateTail;
     function createNoSubstitutionTemplateLiteral(text) {
-        var node = createSynthesizedNode(13);
+        var node = createSynthesizedNode(13 /* NoSubstitutionTemplateLiteral */);
         node.text = text;
         return node;
     }
     ts.createNoSubstitutionTemplateLiteral = createNoSubstitutionTemplateLiteral;
     function createYield(asteriskTokenOrExpression, expression) {
-        var node = createSynthesizedNode(203);
-        node.asteriskToken = asteriskTokenOrExpression && asteriskTokenOrExpression.kind === 39 ? asteriskTokenOrExpression : undefined;
-        node.expression = asteriskTokenOrExpression && asteriskTokenOrExpression.kind !== 39 ? asteriskTokenOrExpression : expression;
+        var node = createSynthesizedNode(203 /* YieldExpression */);
+        node.asteriskToken = asteriskTokenOrExpression && asteriskTokenOrExpression.kind === 39 /* AsteriskToken */ ? asteriskTokenOrExpression : undefined;
+        node.expression = asteriskTokenOrExpression && asteriskTokenOrExpression.kind !== 39 /* AsteriskToken */ ? asteriskTokenOrExpression : expression;
         return node;
     }
     ts.createYield = createYield;
@@ -44965,7 +56282,7 @@ var ts;
     }
     ts.updateYield = updateYield;
     function createSpread(expression) {
-        var node = createSynthesizedNode(204);
+        var node = createSynthesizedNode(204 /* SpreadElement */);
         node.expression = ts.parenthesizeExpressionForList(expression);
         return node;
     }
@@ -44977,7 +56294,7 @@ var ts;
     }
     ts.updateSpread = updateSpread;
     function createClassExpression(modifiers, name, typeParameters, heritageClauses, members) {
-        var node = createSynthesizedNode(205);
+        var node = createSynthesizedNode(205 /* ClassExpression */);
         node.decorators = undefined;
         node.modifiers = asNodeArray(modifiers);
         node.name = asName(name);
@@ -44998,11 +56315,11 @@ var ts;
     }
     ts.updateClassExpression = updateClassExpression;
     function createOmittedExpression() {
-        return createSynthesizedNode(206);
+        return createSynthesizedNode(206 /* OmittedExpression */);
     }
     ts.createOmittedExpression = createOmittedExpression;
     function createExpressionWithTypeArguments(typeArguments, expression) {
-        var node = createSynthesizedNode(207);
+        var node = createSynthesizedNode(207 /* ExpressionWithTypeArguments */);
         node.expression = ts.parenthesizeForAccess(expression);
         node.typeArguments = asNodeArray(typeArguments);
         return node;
@@ -45016,7 +56333,7 @@ var ts;
     }
     ts.updateExpressionWithTypeArguments = updateExpressionWithTypeArguments;
     function createAsExpression(expression, type) {
-        var node = createSynthesizedNode(208);
+        var node = createSynthesizedNode(208 /* AsExpression */);
         node.expression = expression;
         node.type = type;
         return node;
@@ -45030,7 +56347,7 @@ var ts;
     }
     ts.updateAsExpression = updateAsExpression;
     function createNonNullExpression(expression) {
-        var node = createSynthesizedNode(209);
+        var node = createSynthesizedNode(209 /* NonNullExpression */);
         node.expression = ts.parenthesizeForAccess(expression);
         return node;
     }
@@ -45042,7 +56359,7 @@ var ts;
     }
     ts.updateNonNullExpression = updateNonNullExpression;
     function createMetaProperty(keywordToken, name) {
-        var node = createSynthesizedNode(210);
+        var node = createSynthesizedNode(210 /* MetaProperty */);
         node.keywordToken = keywordToken;
         node.name = name;
         return node;
@@ -45054,8 +56371,9 @@ var ts;
             : node;
     }
     ts.updateMetaProperty = updateMetaProperty;
+    // Misc
     function createTemplateSpan(expression, literal) {
-        var node = createSynthesizedNode(211);
+        var node = createSynthesizedNode(211 /* TemplateSpan */);
         node.expression = expression;
         node.literal = literal;
         return node;
@@ -45069,19 +56387,21 @@ var ts;
     }
     ts.updateTemplateSpan = updateTemplateSpan;
     function createSemicolonClassElement() {
-        return createSynthesizedNode(212);
+        return createSynthesizedNode(212 /* SemicolonClassElement */);
     }
     ts.createSemicolonClassElement = createSemicolonClassElement;
+    // Element
     function createBlock(statements, multiLine) {
-        var block = createSynthesizedNode(213);
+        var block = createSynthesizedNode(213 /* Block */);
         block.statements = createNodeArray(statements);
         if (multiLine)
             block.multiLine = multiLine;
         return block;
     }
     ts.createBlock = createBlock;
+    /* @internal */
     function createExpressionStatement(expression) {
-        var node = createSynthesizedNode(216);
+        var node = createSynthesizedNode(216 /* ExpressionStatement */);
         node.expression = expression;
         return node;
     }
@@ -45093,7 +56413,7 @@ var ts;
     }
     ts.updateBlock = updateBlock;
     function createVariableStatement(modifiers, declarationList) {
-        var node = createSynthesizedNode(214);
+        var node = createSynthesizedNode(214 /* VariableStatement */);
         node.decorators = undefined;
         node.modifiers = asNodeArray(modifiers);
         node.declarationList = ts.isArray(declarationList) ? createVariableDeclarationList(declarationList) : declarationList;
@@ -45108,7 +56428,7 @@ var ts;
     }
     ts.updateVariableStatement = updateVariableStatement;
     function createEmptyStatement() {
-        return createSynthesizedNode(215);
+        return createSynthesizedNode(215 /* EmptyStatement */);
     }
     ts.createEmptyStatement = createEmptyStatement;
     function createStatement(expression) {
@@ -45122,7 +56442,7 @@ var ts;
     }
     ts.updateStatement = updateStatement;
     function createIf(expression, thenStatement, elseStatement) {
-        var node = createSynthesizedNode(217);
+        var node = createSynthesizedNode(217 /* IfStatement */);
         node.expression = expression;
         node.thenStatement = thenStatement;
         node.elseStatement = elseStatement;
@@ -45138,7 +56458,7 @@ var ts;
     }
     ts.updateIf = updateIf;
     function createDo(statement, expression) {
-        var node = createSynthesizedNode(218);
+        var node = createSynthesizedNode(218 /* DoStatement */);
         node.statement = statement;
         node.expression = expression;
         return node;
@@ -45152,7 +56472,7 @@ var ts;
     }
     ts.updateDo = updateDo;
     function createWhile(expression, statement) {
-        var node = createSynthesizedNode(219);
+        var node = createSynthesizedNode(219 /* WhileStatement */);
         node.expression = expression;
         node.statement = statement;
         return node;
@@ -45166,7 +56486,7 @@ var ts;
     }
     ts.updateWhile = updateWhile;
     function createFor(initializer, condition, incrementor, statement) {
-        var node = createSynthesizedNode(220);
+        var node = createSynthesizedNode(220 /* ForStatement */);
         node.initializer = initializer;
         node.condition = condition;
         node.incrementor = incrementor;
@@ -45184,7 +56504,7 @@ var ts;
     }
     ts.updateFor = updateFor;
     function createForIn(initializer, expression, statement) {
-        var node = createSynthesizedNode(221);
+        var node = createSynthesizedNode(221 /* ForInStatement */);
         node.initializer = initializer;
         node.expression = expression;
         node.statement = statement;
@@ -45200,7 +56520,7 @@ var ts;
     }
     ts.updateForIn = updateForIn;
     function createForOf(awaitModifier, initializer, expression, statement) {
-        var node = createSynthesizedNode(222);
+        var node = createSynthesizedNode(222 /* ForOfStatement */);
         node.awaitModifier = awaitModifier;
         node.initializer = initializer;
         node.expression = expression;
@@ -45218,7 +56538,7 @@ var ts;
     }
     ts.updateForOf = updateForOf;
     function createContinue(label) {
-        var node = createSynthesizedNode(223);
+        var node = createSynthesizedNode(223 /* ContinueStatement */);
         node.label = asName(label);
         return node;
     }
@@ -45230,7 +56550,7 @@ var ts;
     }
     ts.updateContinue = updateContinue;
     function createBreak(label) {
-        var node = createSynthesizedNode(224);
+        var node = createSynthesizedNode(224 /* BreakStatement */);
         node.label = asName(label);
         return node;
     }
@@ -45242,7 +56562,7 @@ var ts;
     }
     ts.updateBreak = updateBreak;
     function createReturn(expression) {
-        var node = createSynthesizedNode(225);
+        var node = createSynthesizedNode(225 /* ReturnStatement */);
         node.expression = expression;
         return node;
     }
@@ -45254,7 +56574,7 @@ var ts;
     }
     ts.updateReturn = updateReturn;
     function createWith(expression, statement) {
-        var node = createSynthesizedNode(226);
+        var node = createSynthesizedNode(226 /* WithStatement */);
         node.expression = expression;
         node.statement = statement;
         return node;
@@ -45268,7 +56588,7 @@ var ts;
     }
     ts.updateWith = updateWith;
     function createSwitch(expression, caseBlock) {
-        var node = createSynthesizedNode(227);
+        var node = createSynthesizedNode(227 /* SwitchStatement */);
         node.expression = ts.parenthesizeExpressionForList(expression);
         node.caseBlock = caseBlock;
         return node;
@@ -45282,7 +56602,7 @@ var ts;
     }
     ts.updateSwitch = updateSwitch;
     function createLabel(label, statement) {
-        var node = createSynthesizedNode(228);
+        var node = createSynthesizedNode(228 /* LabeledStatement */);
         node.label = asName(label);
         node.statement = statement;
         return node;
@@ -45296,7 +56616,7 @@ var ts;
     }
     ts.updateLabel = updateLabel;
     function createThrow(expression) {
-        var node = createSynthesizedNode(229);
+        var node = createSynthesizedNode(229 /* ThrowStatement */);
         node.expression = expression;
         return node;
     }
@@ -45308,7 +56628,7 @@ var ts;
     }
     ts.updateThrow = updateThrow;
     function createTry(tryBlock, catchClause, finallyBlock) {
-        var node = createSynthesizedNode(230);
+        var node = createSynthesizedNode(230 /* TryStatement */);
         node.tryBlock = tryBlock;
         node.catchClause = catchClause;
         node.finallyBlock = finallyBlock;
@@ -45324,11 +56644,11 @@ var ts;
     }
     ts.updateTry = updateTry;
     function createDebuggerStatement() {
-        return createSynthesizedNode(231);
+        return createSynthesizedNode(231 /* DebuggerStatement */);
     }
     ts.createDebuggerStatement = createDebuggerStatement;
     function createVariableDeclaration(name, type, initializer) {
-        var node = createSynthesizedNode(232);
+        var node = createSynthesizedNode(232 /* VariableDeclaration */);
         node.name = asName(name);
         node.type = type;
         node.initializer = initializer !== undefined ? ts.parenthesizeExpressionForList(initializer) : undefined;
@@ -45344,9 +56664,9 @@ var ts;
     }
     ts.updateVariableDeclaration = updateVariableDeclaration;
     function createVariableDeclarationList(declarations, flags) {
-        if (flags === void 0) { flags = 0; }
-        var node = createSynthesizedNode(233);
-        node.flags |= flags & 3;
+        if (flags === void 0) { flags = 0 /* None */; }
+        var node = createSynthesizedNode(233 /* VariableDeclarationList */);
+        node.flags |= flags & 3 /* BlockScoped */;
         node.declarations = createNodeArray(declarations);
         return node;
     }
@@ -45358,7 +56678,7 @@ var ts;
     }
     ts.updateVariableDeclarationList = updateVariableDeclarationList;
     function createFunctionDeclaration(decorators, modifiers, asteriskToken, name, typeParameters, parameters, type, body) {
-        var node = createSynthesizedNode(234);
+        var node = createSynthesizedNode(234 /* FunctionDeclaration */);
         node.decorators = asNodeArray(decorators);
         node.modifiers = asNodeArray(modifiers);
         node.asteriskToken = asteriskToken;
@@ -45384,7 +56704,7 @@ var ts;
     }
     ts.updateFunctionDeclaration = updateFunctionDeclaration;
     function createClassDeclaration(decorators, modifiers, name, typeParameters, heritageClauses, members) {
-        var node = createSynthesizedNode(235);
+        var node = createSynthesizedNode(235 /* ClassDeclaration */);
         node.decorators = asNodeArray(decorators);
         node.modifiers = asNodeArray(modifiers);
         node.name = asName(name);
@@ -45406,7 +56726,7 @@ var ts;
     }
     ts.updateClassDeclaration = updateClassDeclaration;
     function createInterfaceDeclaration(decorators, modifiers, name, typeParameters, heritageClauses, members) {
-        var node = createSynthesizedNode(236);
+        var node = createSynthesizedNode(236 /* InterfaceDeclaration */);
         node.decorators = asNodeArray(decorators);
         node.modifiers = asNodeArray(modifiers);
         node.name = asName(name);
@@ -45428,7 +56748,7 @@ var ts;
     }
     ts.updateInterfaceDeclaration = updateInterfaceDeclaration;
     function createTypeAliasDeclaration(decorators, modifiers, name, typeParameters, type) {
-        var node = createSynthesizedNode(237);
+        var node = createSynthesizedNode(237 /* TypeAliasDeclaration */);
         node.decorators = asNodeArray(decorators);
         node.modifiers = asNodeArray(modifiers);
         node.name = asName(name);
@@ -45448,7 +56768,7 @@ var ts;
     }
     ts.updateTypeAliasDeclaration = updateTypeAliasDeclaration;
     function createEnumDeclaration(decorators, modifiers, name, members) {
-        var node = createSynthesizedNode(238);
+        var node = createSynthesizedNode(238 /* EnumDeclaration */);
         node.decorators = asNodeArray(decorators);
         node.modifiers = asNodeArray(modifiers);
         node.name = asName(name);
@@ -45466,9 +56786,9 @@ var ts;
     }
     ts.updateEnumDeclaration = updateEnumDeclaration;
     function createModuleDeclaration(decorators, modifiers, name, body, flags) {
-        if (flags === void 0) { flags = 0; }
-        var node = createSynthesizedNode(239);
-        node.flags |= flags & (16 | 4 | 512);
+        if (flags === void 0) { flags = 0 /* None */; }
+        var node = createSynthesizedNode(239 /* ModuleDeclaration */);
+        node.flags |= flags & (16 /* Namespace */ | 4 /* NestedNamespace */ | 512 /* GlobalAugmentation */);
         node.decorators = asNodeArray(decorators);
         node.modifiers = asNodeArray(modifiers);
         node.name = name;
@@ -45486,7 +56806,7 @@ var ts;
     }
     ts.updateModuleDeclaration = updateModuleDeclaration;
     function createModuleBlock(statements) {
-        var node = createSynthesizedNode(240);
+        var node = createSynthesizedNode(240 /* ModuleBlock */);
         node.statements = createNodeArray(statements);
         return node;
     }
@@ -45498,7 +56818,7 @@ var ts;
     }
     ts.updateModuleBlock = updateModuleBlock;
     function createCaseBlock(clauses) {
-        var node = createSynthesizedNode(241);
+        var node = createSynthesizedNode(241 /* CaseBlock */);
         node.clauses = createNodeArray(clauses);
         return node;
     }
@@ -45510,7 +56830,7 @@ var ts;
     }
     ts.updateCaseBlock = updateCaseBlock;
     function createNamespaceExportDeclaration(name) {
-        var node = createSynthesizedNode(242);
+        var node = createSynthesizedNode(242 /* NamespaceExportDeclaration */);
         node.name = asName(name);
         return node;
     }
@@ -45522,7 +56842,7 @@ var ts;
     }
     ts.updateNamespaceExportDeclaration = updateNamespaceExportDeclaration;
     function createImportEqualsDeclaration(decorators, modifiers, name, moduleReference) {
-        var node = createSynthesizedNode(243);
+        var node = createSynthesizedNode(243 /* ImportEqualsDeclaration */);
         node.decorators = asNodeArray(decorators);
         node.modifiers = asNodeArray(modifiers);
         node.name = asName(name);
@@ -45540,7 +56860,7 @@ var ts;
     }
     ts.updateImportEqualsDeclaration = updateImportEqualsDeclaration;
     function createImportDeclaration(decorators, modifiers, importClause, moduleSpecifier) {
-        var node = createSynthesizedNode(244);
+        var node = createSynthesizedNode(244 /* ImportDeclaration */);
         node.decorators = asNodeArray(decorators);
         node.modifiers = asNodeArray(modifiers);
         node.importClause = importClause;
@@ -45558,7 +56878,7 @@ var ts;
     }
     ts.updateImportDeclaration = updateImportDeclaration;
     function createImportClause(name, namedBindings) {
-        var node = createSynthesizedNode(245);
+        var node = createSynthesizedNode(245 /* ImportClause */);
         node.name = name;
         node.namedBindings = namedBindings;
         return node;
@@ -45572,7 +56892,7 @@ var ts;
     }
     ts.updateImportClause = updateImportClause;
     function createNamespaceImport(name) {
-        var node = createSynthesizedNode(246);
+        var node = createSynthesizedNode(246 /* NamespaceImport */);
         node.name = name;
         return node;
     }
@@ -45584,7 +56904,7 @@ var ts;
     }
     ts.updateNamespaceImport = updateNamespaceImport;
     function createNamedImports(elements) {
-        var node = createSynthesizedNode(247);
+        var node = createSynthesizedNode(247 /* NamedImports */);
         node.elements = createNodeArray(elements);
         return node;
     }
@@ -45596,7 +56916,7 @@ var ts;
     }
     ts.updateNamedImports = updateNamedImports;
     function createImportSpecifier(propertyName, name) {
-        var node = createSynthesizedNode(248);
+        var node = createSynthesizedNode(248 /* ImportSpecifier */);
         node.propertyName = propertyName;
         node.name = name;
         return node;
@@ -45610,11 +56930,11 @@ var ts;
     }
     ts.updateImportSpecifier = updateImportSpecifier;
     function createExportAssignment(decorators, modifiers, isExportEquals, expression) {
-        var node = createSynthesizedNode(249);
+        var node = createSynthesizedNode(249 /* ExportAssignment */);
         node.decorators = asNodeArray(decorators);
         node.modifiers = asNodeArray(modifiers);
         node.isExportEquals = isExportEquals;
-        node.expression = isExportEquals ? ts.parenthesizeBinaryOperand(58, expression, false, undefined) : ts.parenthesizeDefaultExpression(expression);
+        node.expression = isExportEquals ? ts.parenthesizeBinaryOperand(58 /* EqualsToken */, expression, /*isLeftSideOfBinary*/ false, /*leftOperand*/ undefined) : ts.parenthesizeDefaultExpression(expression);
         return node;
     }
     ts.createExportAssignment = createExportAssignment;
@@ -45627,7 +56947,7 @@ var ts;
     }
     ts.updateExportAssignment = updateExportAssignment;
     function createExportDeclaration(decorators, modifiers, exportClause, moduleSpecifier) {
-        var node = createSynthesizedNode(250);
+        var node = createSynthesizedNode(250 /* ExportDeclaration */);
         node.decorators = asNodeArray(decorators);
         node.modifiers = asNodeArray(modifiers);
         node.exportClause = exportClause;
@@ -45645,7 +56965,7 @@ var ts;
     }
     ts.updateExportDeclaration = updateExportDeclaration;
     function createNamedExports(elements) {
-        var node = createSynthesizedNode(251);
+        var node = createSynthesizedNode(251 /* NamedExports */);
         node.elements = createNodeArray(elements);
         return node;
     }
@@ -45657,7 +56977,7 @@ var ts;
     }
     ts.updateNamedExports = updateNamedExports;
     function createExportSpecifier(propertyName, name) {
-        var node = createSynthesizedNode(252);
+        var node = createSynthesizedNode(252 /* ExportSpecifier */);
         node.propertyName = asName(propertyName);
         node.name = asName(name);
         return node;
@@ -45670,8 +56990,9 @@ var ts;
             : node;
     }
     ts.updateExportSpecifier = updateExportSpecifier;
+    // Module references
     function createExternalModuleReference(expression) {
-        var node = createSynthesizedNode(254);
+        var node = createSynthesizedNode(254 /* ExternalModuleReference */);
         node.expression = expression;
         return node;
     }
@@ -45682,8 +57003,9 @@ var ts;
             : node;
     }
     ts.updateExternalModuleReference = updateExternalModuleReference;
+    // JSX
     function createJsxElement(openingElement, children, closingElement) {
-        var node = createSynthesizedNode(255);
+        var node = createSynthesizedNode(255 /* JsxElement */);
         node.openingElement = openingElement;
         node.children = createNodeArray(children);
         node.closingElement = closingElement;
@@ -45699,7 +57021,7 @@ var ts;
     }
     ts.updateJsxElement = updateJsxElement;
     function createJsxSelfClosingElement(tagName, typeArguments, attributes) {
-        var node = createSynthesizedNode(256);
+        var node = createSynthesizedNode(256 /* JsxSelfClosingElement */);
         node.tagName = tagName;
         node.typeArguments = typeArguments && createNodeArray(typeArguments);
         node.attributes = attributes;
@@ -45715,7 +57037,7 @@ var ts;
     }
     ts.updateJsxSelfClosingElement = updateJsxSelfClosingElement;
     function createJsxOpeningElement(tagName, typeArguments, attributes) {
-        var node = createSynthesizedNode(257);
+        var node = createSynthesizedNode(257 /* JsxOpeningElement */);
         node.tagName = tagName;
         node.typeArguments = typeArguments && createNodeArray(typeArguments);
         node.attributes = attributes;
@@ -45731,7 +57053,7 @@ var ts;
     }
     ts.updateJsxOpeningElement = updateJsxOpeningElement;
     function createJsxClosingElement(tagName) {
-        var node = createSynthesizedNode(258);
+        var node = createSynthesizedNode(258 /* JsxClosingElement */);
         node.tagName = tagName;
         return node;
     }
@@ -45743,7 +57065,7 @@ var ts;
     }
     ts.updateJsxClosingElement = updateJsxClosingElement;
     function createJsxFragment(openingFragment, children, closingFragment) {
-        var node = createSynthesizedNode(259);
+        var node = createSynthesizedNode(259 /* JsxFragment */);
         node.openingFragment = openingFragment;
         node.children = createNodeArray(children);
         node.closingFragment = closingFragment;
@@ -45759,7 +57081,7 @@ var ts;
     }
     ts.updateJsxFragment = updateJsxFragment;
     function createJsxAttribute(name, initializer) {
-        var node = createSynthesizedNode(262);
+        var node = createSynthesizedNode(262 /* JsxAttribute */);
         node.name = name;
         node.initializer = initializer;
         return node;
@@ -45773,7 +57095,7 @@ var ts;
     }
     ts.updateJsxAttribute = updateJsxAttribute;
     function createJsxAttributes(properties) {
-        var node = createSynthesizedNode(263);
+        var node = createSynthesizedNode(263 /* JsxAttributes */);
         node.properties = createNodeArray(properties);
         return node;
     }
@@ -45785,7 +57107,7 @@ var ts;
     }
     ts.updateJsxAttributes = updateJsxAttributes;
     function createJsxSpreadAttribute(expression) {
-        var node = createSynthesizedNode(264);
+        var node = createSynthesizedNode(264 /* JsxSpreadAttribute */);
         node.expression = expression;
         return node;
     }
@@ -45797,7 +57119,7 @@ var ts;
     }
     ts.updateJsxSpreadAttribute = updateJsxSpreadAttribute;
     function createJsxExpression(dotDotDotToken, expression) {
-        var node = createSynthesizedNode(265);
+        var node = createSynthesizedNode(265 /* JsxExpression */);
         node.dotDotDotToken = dotDotDotToken;
         node.expression = expression;
         return node;
@@ -45809,8 +57131,9 @@ var ts;
             : node;
     }
     ts.updateJsxExpression = updateJsxExpression;
+    // Clauses
     function createCaseClause(expression, statements) {
-        var node = createSynthesizedNode(266);
+        var node = createSynthesizedNode(266 /* CaseClause */);
         node.expression = ts.parenthesizeExpressionForList(expression);
         node.statements = createNodeArray(statements);
         return node;
@@ -45824,7 +57147,7 @@ var ts;
     }
     ts.updateCaseClause = updateCaseClause;
     function createDefaultClause(statements) {
-        var node = createSynthesizedNode(267);
+        var node = createSynthesizedNode(267 /* DefaultClause */);
         node.statements = createNodeArray(statements);
         return node;
     }
@@ -45836,7 +57159,7 @@ var ts;
     }
     ts.updateDefaultClause = updateDefaultClause;
     function createHeritageClause(token, types) {
-        var node = createSynthesizedNode(268);
+        var node = createSynthesizedNode(268 /* HeritageClause */);
         node.token = token;
         node.types = createNodeArray(types);
         return node;
@@ -45849,7 +57172,7 @@ var ts;
     }
     ts.updateHeritageClause = updateHeritageClause;
     function createCatchClause(variableDeclaration, block) {
-        var node = createSynthesizedNode(269);
+        var node = createSynthesizedNode(269 /* CatchClause */);
         node.variableDeclaration = ts.isString(variableDeclaration) ? createVariableDeclaration(variableDeclaration) : variableDeclaration;
         node.block = block;
         return node;
@@ -45862,8 +57185,9 @@ var ts;
             : node;
     }
     ts.updateCatchClause = updateCatchClause;
+    // Property assignments
     function createPropertyAssignment(name, initializer) {
-        var node = createSynthesizedNode(270);
+        var node = createSynthesizedNode(270 /* PropertyAssignment */);
         node.name = asName(name);
         node.questionToken = undefined;
         node.initializer = ts.parenthesizeExpressionForList(initializer);
@@ -45878,7 +57202,7 @@ var ts;
     }
     ts.updatePropertyAssignment = updatePropertyAssignment;
     function createShorthandPropertyAssignment(name, objectAssignmentInitializer) {
-        var node = createSynthesizedNode(271);
+        var node = createSynthesizedNode(271 /* ShorthandPropertyAssignment */);
         node.name = asName(name);
         node.objectAssignmentInitializer = objectAssignmentInitializer !== undefined ? ts.parenthesizeExpressionForList(objectAssignmentInitializer) : undefined;
         return node;
@@ -45892,8 +57216,8 @@ var ts;
     }
     ts.updateShorthandPropertyAssignment = updateShorthandPropertyAssignment;
     function createSpreadAssignment(expression) {
-        var node = createSynthesizedNode(272);
-        node.expression = expression !== undefined ? ts.parenthesizeExpressionForList(expression) : undefined;
+        var node = createSynthesizedNode(272 /* SpreadAssignment */);
+        node.expression = expression !== undefined ? ts.parenthesizeExpressionForList(expression) : undefined; // TODO: GH#18217
         return node;
     }
     ts.createSpreadAssignment = createSpreadAssignment;
@@ -45903,8 +57227,9 @@ var ts;
             : node;
     }
     ts.updateSpreadAssignment = updateSpreadAssignment;
+    // Enum
     function createEnumMember(name, initializer) {
-        var node = createSynthesizedNode(273);
+        var node = createSynthesizedNode(273 /* EnumMember */);
         node.name = asName(name);
         node.initializer = initializer && ts.parenthesizeExpressionForList(initializer);
         return node;
@@ -45917,13 +57242,15 @@ var ts;
             : node;
     }
     ts.updateEnumMember = updateEnumMember;
-    function updateSourceFileNode(node, statements, isDeclarationFile, referencedFiles, typeReferences, hasNoDefaultLib) {
+    // Top-level nodes
+    function updateSourceFileNode(node, statements, isDeclarationFile, referencedFiles, typeReferences, hasNoDefaultLib, libReferences) {
         if (node.statements !== statements ||
             (isDeclarationFile !== undefined && node.isDeclarationFile !== isDeclarationFile) ||
             (referencedFiles !== undefined && node.referencedFiles !== referencedFiles) ||
             (typeReferences !== undefined && node.typeReferenceDirectives !== typeReferences) ||
+            (libReferences !== undefined && node.libReferenceDirectives !== libReferences) ||
             (hasNoDefaultLib !== undefined && node.hasNoDefaultLib !== hasNoDefaultLib)) {
-            var updated = createSynthesizedNode(274);
+            var updated = createSynthesizedNode(274 /* SourceFile */);
             updated.flags |= node.flags;
             updated.statements = createNodeArray(statements);
             updated.endOfFileToken = node.endOfFileToken;
@@ -45934,6 +57261,7 @@ var ts;
             updated.referencedFiles = referencedFiles === undefined ? node.referencedFiles : referencedFiles;
             updated.typeReferenceDirectives = typeReferences === undefined ? node.typeReferenceDirectives : typeReferences;
             updated.hasNoDefaultLib = hasNoDefaultLib === undefined ? node.hasNoDefaultLib : hasNoDefaultLib;
+            updated.libReferenceDirectives = libReferences === undefined ? node.libReferenceDirectives : libReferences;
             if (node.amdDependencies !== undefined)
                 updated.amdDependencies = node.amdDependencies;
             if (node.moduleName !== undefined)
@@ -45987,6 +57315,9 @@ var ts;
         return node;
     }
     ts.updateSourceFileNode = updateSourceFileNode;
+    /**
+     * Creates a shallow, memberwise clone of a node for mutation.
+     */
     function getMutableClone(node) {
         var clone = getSynthesizedClone(node);
         clone.pos = node.pos;
@@ -45995,29 +57326,54 @@ var ts;
         return clone;
     }
     ts.getMutableClone = getMutableClone;
+    // Transformation nodes
+    /**
+     * Creates a synthetic statement to act as a placeholder for a not-emitted statement in
+     * order to preserve comments.
+     *
+     * @param original The original statement.
+     */
     function createNotEmittedStatement(original) {
-        var node = createSynthesizedNode(300);
+        var node = createSynthesizedNode(300 /* NotEmittedStatement */);
         node.original = original;
         setTextRange(node, original);
         return node;
     }
     ts.createNotEmittedStatement = createNotEmittedStatement;
+    /**
+     * Creates a synthetic element to act as a placeholder for the end of an emitted declaration in
+     * order to properly emit exports.
+     */
+    /* @internal */
     function createEndOfDeclarationMarker(original) {
-        var node = createSynthesizedNode(304);
+        var node = createSynthesizedNode(304 /* EndOfDeclarationMarker */);
         node.emitNode = {};
         node.original = original;
         return node;
     }
     ts.createEndOfDeclarationMarker = createEndOfDeclarationMarker;
+    /**
+     * Creates a synthetic element to act as a placeholder for the beginning of a merged declaration in
+     * order to properly emit exports.
+     */
+    /* @internal */
     function createMergeDeclarationMarker(original) {
-        var node = createSynthesizedNode(303);
+        var node = createSynthesizedNode(303 /* MergeDeclarationMarker */);
         node.emitNode = {};
         node.original = original;
         return node;
     }
     ts.createMergeDeclarationMarker = createMergeDeclarationMarker;
+    /**
+     * Creates a synthetic expression to act as a placeholder for a not-emitted expression in
+     * order to preserve comments or sourcemap positions.
+     *
+     * @param expression The inner expression to emit.
+     * @param original The original outer expression.
+     * @param location The location for the expression. Defaults to the positions from "original" if provided.
+     */
     function createPartiallyEmittedExpression(expression, original) {
-        var node = createSynthesizedNode(301);
+        var node = createSynthesizedNode(301 /* PartiallyEmittedExpression */);
         node.expression = expression;
         node.original = original;
         setTextRange(node, original);
@@ -46033,17 +57389,17 @@ var ts;
     ts.updatePartiallyEmittedExpression = updatePartiallyEmittedExpression;
     function flattenCommaElements(node) {
         if (ts.nodeIsSynthesized(node) && !ts.isParseTreeNode(node) && !node.original && !node.emitNode && !node.id) {
-            if (node.kind === 302) {
+            if (node.kind === 302 /* CommaListExpression */) {
                 return node.elements;
             }
-            if (ts.isBinaryExpression(node) && node.operatorToken.kind === 26) {
+            if (ts.isBinaryExpression(node) && node.operatorToken.kind === 26 /* CommaToken */) {
                 return [node.left, node.right];
             }
         }
         return node;
     }
     function createCommaList(elements) {
-        var node = createSynthesizedNode(302);
+        var node = createSynthesizedNode(302 /* CommaListExpression */);
         node.elements = createNodeArray(ts.sameFlatMap(elements, flattenCommaElements));
         return node;
     }
@@ -46056,22 +57412,25 @@ var ts;
     ts.updateCommaList = updateCommaList;
     function createBundle(sourceFiles, prepends) {
         if (prepends === void 0) { prepends = ts.emptyArray; }
-        var node = ts.createNode(275);
+        var node = ts.createNode(275 /* Bundle */);
         node.prepends = prepends;
         node.sourceFiles = sourceFiles;
         return node;
     }
     ts.createBundle = createBundle;
-    function createUnparsedSourceFile(text) {
-        var node = ts.createNode(276);
+    function createUnparsedSourceFile(text, map) {
+        var node = ts.createNode(276 /* UnparsedSource */);
         node.text = text;
+        node.sourceMapText = map;
         return node;
     }
     ts.createUnparsedSourceFile = createUnparsedSourceFile;
-    function createInputFiles(javascript, declaration) {
-        var node = ts.createNode(277);
+    function createInputFiles(javascript, declaration, javascriptMapText, declarationMapText) {
+        var node = ts.createNode(277 /* InputFiles */);
         node.javascriptText = javascript;
+        node.javascriptMapText = javascriptMapText;
         node.declarationText = declaration;
+        node.declarationMapText = declarationMapText;
         return node;
     }
     ts.createInputFiles = createInputFiles;
@@ -46084,55 +57443,70 @@ var ts;
     }
     ts.updateBundle = updateBundle;
     function createImmediatelyInvokedFunctionExpression(statements, param, paramValue) {
-        return createCall(createFunctionExpression(undefined, undefined, undefined, undefined, param ? [param] : [], undefined, createBlock(statements, true)), undefined, paramValue ? [paramValue] : []);
+        return createCall(createFunctionExpression(
+        /*modifiers*/ undefined, 
+        /*asteriskToken*/ undefined, 
+        /*name*/ undefined, 
+        /*typeParameters*/ undefined, 
+        /*parameters*/ param ? [param] : [], 
+        /*type*/ undefined, createBlock(statements, /*multiLine*/ true)), 
+        /*typeArguments*/ undefined, 
+        /*argumentsArray*/ paramValue ? [paramValue] : []);
     }
     ts.createImmediatelyInvokedFunctionExpression = createImmediatelyInvokedFunctionExpression;
     function createImmediatelyInvokedArrowFunction(statements, param, paramValue) {
-        return createCall(createArrowFunction(undefined, undefined, param ? [param] : [], undefined, undefined, createBlock(statements, true)), undefined, paramValue ? [paramValue] : []);
+        return createCall(createArrowFunction(
+        /*modifiers*/ undefined, 
+        /*typeParameters*/ undefined, 
+        /*parameters*/ param ? [param] : [], 
+        /*type*/ undefined, 
+        /*equalsGreaterThanToken*/ undefined, createBlock(statements, /*multiLine*/ true)), 
+        /*typeArguments*/ undefined, 
+        /*argumentsArray*/ paramValue ? [paramValue] : []);
     }
     ts.createImmediatelyInvokedArrowFunction = createImmediatelyInvokedArrowFunction;
     function createComma(left, right) {
-        return createBinary(left, 26, right);
+        return createBinary(left, 26 /* CommaToken */, right);
     }
     ts.createComma = createComma;
     function createLessThan(left, right) {
-        return createBinary(left, 27, right);
+        return createBinary(left, 27 /* LessThanToken */, right);
     }
     ts.createLessThan = createLessThan;
     function createAssignment(left, right) {
-        return createBinary(left, 58, right);
+        return createBinary(left, 58 /* EqualsToken */, right);
     }
     ts.createAssignment = createAssignment;
     function createStrictEquality(left, right) {
-        return createBinary(left, 34, right);
+        return createBinary(left, 34 /* EqualsEqualsEqualsToken */, right);
     }
     ts.createStrictEquality = createStrictEquality;
     function createStrictInequality(left, right) {
-        return createBinary(left, 35, right);
+        return createBinary(left, 35 /* ExclamationEqualsEqualsToken */, right);
     }
     ts.createStrictInequality = createStrictInequality;
     function createAdd(left, right) {
-        return createBinary(left, 37, right);
+        return createBinary(left, 37 /* PlusToken */, right);
     }
     ts.createAdd = createAdd;
     function createSubtract(left, right) {
-        return createBinary(left, 38, right);
+        return createBinary(left, 38 /* MinusToken */, right);
     }
     ts.createSubtract = createSubtract;
     function createPostfixIncrement(operand) {
-        return createPostfix(operand, 43);
+        return createPostfix(operand, 43 /* PlusPlusToken */);
     }
     ts.createPostfixIncrement = createPostfixIncrement;
     function createLogicalAnd(left, right) {
-        return createBinary(left, 53, right);
+        return createBinary(left, 53 /* AmpersandAmpersandToken */, right);
     }
     ts.createLogicalAnd = createLogicalAnd;
     function createLogicalOr(left, right) {
-        return createBinary(left, 54, right);
+        return createBinary(left, 54 /* BarBarToken */, right);
     }
     ts.createLogicalOr = createLogicalOr;
     function createLogicalNot(operand) {
-        return createPrefix(51, operand);
+        return createPrefix(51 /* ExclamationToken */, operand);
     }
     ts.createLogicalNot = createLogicalNot;
     function createVoidZero() {
@@ -46140,13 +57514,14 @@ var ts;
     }
     ts.createVoidZero = createVoidZero;
     function createExportDefault(expression) {
-        return createExportAssignment(undefined, undefined, false, expression);
+        return createExportAssignment(/*decorators*/ undefined, /*modifiers*/ undefined, /*isExportEquals*/ false, expression);
     }
     ts.createExportDefault = createExportDefault;
     function createExternalModuleExport(exportName) {
-        return createExportDeclaration(undefined, undefined, createNamedExports([createExportSpecifier(undefined, exportName)]));
+        return createExportDeclaration(/*decorators*/ undefined, /*modifiers*/ undefined, createNamedExports([createExportSpecifier(/*propertyName*/ undefined, exportName)]));
     }
     ts.createExternalModuleExport = createExternalModuleExport;
+    // Utilities
     function asName(name) {
         return ts.isString(name) ? createIdentifier(name) : name;
     }
@@ -46159,7 +57534,17 @@ var ts;
     function asToken(value) {
         return typeof value === "number" ? createToken(value) : value;
     }
+    /**
+     * Clears any EmitNode entries from parse-tree nodes.
+     * @param sourceFile A source file.
+     */
     function disposeEmitNodes(sourceFile) {
+        // During transformation we may need to annotate a parse tree node with transient
+        // transformation properties. As parse tree nodes live longer than transformation
+        // nodes, we need to make sure we reclaim any memory allocated for custom ranges
+        // from these nodes to ensure we do not hold onto entire subtrees just for position
+        // information. We also need to reset these nodes to a pre-transformation state
+        // for incremental parsing scenarios so that we do not impact later emit.
         sourceFile = ts.getSourceFileOfNode(ts.getParseTreeNode(sourceFile));
         var emitNode = sourceFile && sourceFile.emitNode;
         var annotatedNodes = emitNode && emitNode.annotatedNodes;
@@ -46171,10 +57556,18 @@ var ts;
         }
     }
     ts.disposeEmitNodes = disposeEmitNodes;
+    /**
+     * Associates a node with the current transformation, initializing
+     * various transient transformation properties.
+     */
+    /* @internal */
     function getOrCreateEmitNode(node) {
         if (!node.emitNode) {
             if (ts.isParseTreeNode(node)) {
-                if (node.kind === 274) {
+                // To avoid holding onto transformation artifacts, we keep track of any
+                // parse tree node we are annotating. This allows us to clean them up after
+                // all transformations have completed.
+                if (node.kind === 274 /* SourceFile */) {
                     return node.emitNode = { annotatedNodes: [node] };
                 }
                 var sourceFile = ts.getSourceFileOfNode(node);
@@ -46193,38 +57586,61 @@ var ts;
         return range;
     }
     ts.setTextRange = setTextRange;
+    /**
+     * Sets flags that control emit behavior of a node.
+     */
     function setEmitFlags(node, emitFlags) {
         getOrCreateEmitNode(node).flags = emitFlags;
         return node;
     }
     ts.setEmitFlags = setEmitFlags;
+    /**
+     * Sets flags that control emit behavior of a node.
+     */
+    /* @internal */
     function addEmitFlags(node, emitFlags) {
         var emitNode = getOrCreateEmitNode(node);
         emitNode.flags = emitNode.flags | emitFlags;
         return node;
     }
     ts.addEmitFlags = addEmitFlags;
+    /**
+     * Gets a custom text range to use when emitting source maps.
+     */
     function getSourceMapRange(node) {
         var emitNode = node.emitNode;
         return (emitNode && emitNode.sourceMapRange) || node;
     }
     ts.getSourceMapRange = getSourceMapRange;
+    /**
+     * Sets a custom text range to use when emitting source maps.
+     */
     function setSourceMapRange(node, range) {
         getOrCreateEmitNode(node).sourceMapRange = range;
         return node;
     }
     ts.setSourceMapRange = setSourceMapRange;
+    // tslint:disable-next-line variable-name
     var SourceMapSource;
+    /**
+     * Create an external source map source file reference
+     */
     function createSourceMapSource(fileName, text, skipTrivia) {
         return new (SourceMapSource || (SourceMapSource = ts.objectAllocator.getSourceMapSourceConstructor()))(fileName, text, skipTrivia);
     }
     ts.createSourceMapSource = createSourceMapSource;
+    /**
+     * Gets the TextRange to use for source maps for a token of a node.
+     */
     function getTokenSourceMapRange(node, token) {
         var emitNode = node.emitNode;
         var tokenSourceMapRanges = emitNode && emitNode.tokenSourceMapRanges;
         return tokenSourceMapRanges && tokenSourceMapRanges[token];
     }
     ts.getTokenSourceMapRange = getTokenSourceMapRange;
+    /**
+     * Sets the TextRange to use for source maps for a token of a node.
+     */
     function setTokenSourceMapRange(node, token, range) {
         var emitNode = getOrCreateEmitNode(node);
         var tokenSourceMapRanges = emitNode.tokenSourceMapRanges || (emitNode.tokenSourceMapRanges = []);
@@ -46232,21 +57648,35 @@ var ts;
         return node;
     }
     ts.setTokenSourceMapRange = setTokenSourceMapRange;
+    /**
+     * Gets a custom text range to use when emitting comments.
+     */
+    /*@internal*/
     function getStartsOnNewLine(node) {
         var emitNode = node.emitNode;
         return emitNode && emitNode.startsOnNewLine;
     }
     ts.getStartsOnNewLine = getStartsOnNewLine;
+    /**
+     * Sets a custom text range to use when emitting comments.
+     */
+    /*@internal*/
     function setStartsOnNewLine(node, newLine) {
         getOrCreateEmitNode(node).startsOnNewLine = newLine;
         return node;
     }
     ts.setStartsOnNewLine = setStartsOnNewLine;
+    /**
+     * Gets a custom text range to use when emitting comments.
+     */
     function getCommentRange(node) {
         var emitNode = node.emitNode;
         return (emitNode && emitNode.commentRange) || node;
     }
     ts.getCommentRange = getCommentRange;
+    /**
+     * Sets a custom text range to use when emitting comments.
+     */
     function setCommentRange(node, range) {
         getOrCreateEmitNode(node).commentRange = range;
         return node;
@@ -46289,23 +57719,35 @@ var ts;
         return node;
     }
     ts.moveSyntheticComments = moveSyntheticComments;
+    /**
+     * Gets the constant value to emit for an expression.
+     */
     function getConstantValue(node) {
         var emitNode = node.emitNode;
         return emitNode && emitNode.constantValue;
     }
     ts.getConstantValue = getConstantValue;
+    /**
+     * Sets the constant value to emit for an expression.
+     */
     function setConstantValue(node, value) {
         var emitNode = getOrCreateEmitNode(node);
         emitNode.constantValue = value;
         return node;
     }
     ts.setConstantValue = setConstantValue;
+    /**
+     * Adds an EmitHelper to a node.
+     */
     function addEmitHelper(node, helper) {
         var emitNode = getOrCreateEmitNode(node);
         emitNode.helpers = ts.append(emitNode.helpers, helper);
         return node;
     }
     ts.addEmitHelper = addEmitHelper;
+    /**
+     * Add EmitHelpers to a node.
+     */
     function addEmitHelpers(node, helpers) {
         if (ts.some(helpers)) {
             var emitNode = getOrCreateEmitNode(node);
@@ -46317,6 +57759,9 @@ var ts;
         return node;
     }
     ts.addEmitHelpers = addEmitHelpers;
+    /**
+     * Removes an EmitHelper from a node.
+     */
     function removeEmitHelper(node, helper) {
         var emitNode = node.emitNode;
         if (emitNode) {
@@ -46328,11 +57773,17 @@ var ts;
         return false;
     }
     ts.removeEmitHelper = removeEmitHelper;
+    /**
+     * Gets the EmitHelpers of a node.
+     */
     function getEmitHelpers(node) {
         var emitNode = node.emitNode;
         return emitNode && emitNode.helpers;
     }
     ts.getEmitHelpers = getEmitHelpers;
+    /**
+     * Moves matching emit helpers from a source node to a target node.
+     */
     function moveEmitHelpers(source, target, predicate) {
         var sourceEmitNode = source.emitNode;
         var sourceEmitHelpers = sourceEmitNode && sourceEmitNode.helpers;
@@ -46355,15 +57806,16 @@ var ts;
         }
     }
     ts.moveEmitHelpers = moveEmitHelpers;
+    /* @internal */
     function compareEmitHelpers(x, y) {
         if (x === y)
-            return 0;
+            return 0 /* EqualTo */;
         if (x.priority === y.priority)
-            return 0;
+            return 0 /* EqualTo */;
         if (x.priority === undefined)
-            return 1;
+            return 1 /* GreaterThan */;
         if (y.priority === undefined)
-            return -1;
+            return -1 /* LessThan */;
         return ts.compareValues(x.priority, y.priority);
     }
     ts.compareEmitHelpers = compareEmitHelpers;
@@ -46381,6 +57833,7 @@ var ts;
         var flags = sourceEmitNode.flags, leadingComments = sourceEmitNode.leadingComments, trailingComments = sourceEmitNode.trailingComments, commentRange = sourceEmitNode.commentRange, sourceMapRange = sourceEmitNode.sourceMapRange, tokenSourceMapRanges = sourceEmitNode.tokenSourceMapRanges, constantValue = sourceEmitNode.constantValue, helpers = sourceEmitNode.helpers, startsOnNewLine = sourceEmitNode.startsOnNewLine;
         if (!destEmitNode)
             destEmitNode = {};
+        // We are using `.slice()` here in case `destEmitNode.leadingComments` is pushed to later.
         if (leadingComments)
             destEmitNode.leadingComments = ts.addRange(leadingComments.slice(), destEmitNode.leadingComments);
         if (trailingComments)
@@ -46410,6 +57863,7 @@ var ts;
         return destRanges;
     }
 })(ts || (ts = {}));
+/* @internal */
 (function (ts) {
     ts.nullTransformationContext = {
         enableEmitNotification: ts.noop,
@@ -46445,19 +57899,21 @@ var ts;
             var expression = ts.setTextRange(ts.isIdentifier(memberName)
                 ? ts.createPropertyAccess(target, memberName)
                 : ts.createElementAccess(target, memberName), memberName);
-            ts.getOrCreateEmitNode(expression).flags |= 64;
+            ts.getOrCreateEmitNode(expression).flags |= 64 /* NoNestedSourceMaps */;
             return expression;
         }
     }
     ts.createMemberAccessForPropertyName = createMemberAccessForPropertyName;
     function createFunctionCall(func, thisArg, argumentsList, location) {
-        return ts.setTextRange(ts.createCall(ts.createPropertyAccess(func, "call"), undefined, [
+        return ts.setTextRange(ts.createCall(ts.createPropertyAccess(func, "call"), 
+        /*typeArguments*/ undefined, [
             thisArg
         ].concat(argumentsList)), location);
     }
     ts.createFunctionCall = createFunctionCall;
     function createFunctionApply(func, thisArg, argumentsExpression, location) {
-        return ts.setTextRange(ts.createCall(ts.createPropertyAccess(func, "apply"), undefined, [
+        return ts.setTextRange(ts.createCall(ts.createPropertyAccess(func, "apply"), 
+        /*typeArguments*/ undefined, [
             thisArg,
             argumentsExpression
         ]), location);
@@ -46468,20 +57924,27 @@ var ts;
         if (start !== undefined) {
             argumentsList.push(typeof start === "number" ? ts.createLiteral(start) : start);
         }
-        return ts.createCall(ts.createPropertyAccess(array, "slice"), undefined, argumentsList);
+        return ts.createCall(ts.createPropertyAccess(array, "slice"), /*typeArguments*/ undefined, argumentsList);
     }
     ts.createArraySlice = createArraySlice;
     function createArrayConcat(array, values) {
-        return ts.createCall(ts.createPropertyAccess(array, "concat"), undefined, values);
+        return ts.createCall(ts.createPropertyAccess(array, "concat"), 
+        /*typeArguments*/ undefined, values);
     }
     ts.createArrayConcat = createArrayConcat;
     function createMathPow(left, right, location) {
-        return ts.setTextRange(ts.createCall(ts.createPropertyAccess(ts.createIdentifier("Math"), "pow"), undefined, [left, right]), location);
+        return ts.setTextRange(ts.createCall(ts.createPropertyAccess(ts.createIdentifier("Math"), "pow"), 
+        /*typeArguments*/ undefined, [left, right]), location);
     }
     ts.createMathPow = createMathPow;
     function createReactNamespace(reactNamespace, parent) {
+        // To ensure the emit resolver can properly resolve the namespace, we need to
+        // treat this identifier as if it were a source tree node by clearing the `Synthesized`
+        // flag and setting a parent node.
         var react = ts.createIdentifier(reactNamespace || "React");
-        react.flags &= ~8;
+        react.flags &= ~8 /* Synthesized */;
+        // Set the parent that is in parse tree
+        // this makes sure that parent chain is intact for checker to traverse complete scope tree
         react.parent = ts.getParseTreeNode(parent);
         return react;
     }
@@ -46521,7 +57984,8 @@ var ts;
                 argumentsList.push(children[0]);
             }
         }
-        return ts.setTextRange(ts.createCall(createJsxFactoryExpression(jsxFactoryEntity, reactNamespace, parentElement), undefined, argumentsList), location);
+        return ts.setTextRange(ts.createCall(createJsxFactoryExpression(jsxFactoryEntity, reactNamespace, parentElement), 
+        /*typeArguments*/ undefined, argumentsList), location);
     }
     ts.createExpressionForJsxElement = createExpressionForJsxElement;
     function createExpressionForJsxFragment(jsxFactoryEntity, reactNamespace, children, parentElement, location) {
@@ -46540,11 +58004,13 @@ var ts;
                 argumentsList.push(children[0]);
             }
         }
-        return ts.setTextRange(ts.createCall(createJsxFactoryExpression(jsxFactoryEntity, reactNamespace, parentElement), undefined, argumentsList), location);
+        return ts.setTextRange(ts.createCall(createJsxFactoryExpression(jsxFactoryEntity, reactNamespace, parentElement), 
+        /*typeArguments*/ undefined, argumentsList), location);
     }
     ts.createExpressionForJsxFragment = createExpressionForJsxFragment;
+    // Helpers
     function getHelperName(name) {
-        return ts.setEmitFlags(ts.createIdentifier(name), 4096 | 2);
+        return ts.setEmitFlags(ts.createIdentifier(name), 4096 /* HelperName */ | 2 /* AdviseOnEmitNode */);
     }
     ts.getHelperName = getHelperName;
     var valuesHelper = {
@@ -46554,7 +58020,8 @@ var ts;
     };
     function createValuesHelper(context, expression, location) {
         context.requestEmitHelper(valuesHelper);
-        return ts.setTextRange(ts.createCall(getHelperName("__values"), undefined, [expression]), location);
+        return ts.setTextRange(ts.createCall(getHelperName("__values"), 
+        /*typeArguments*/ undefined, [expression]), location);
     }
     ts.createValuesHelper = createValuesHelper;
     var readHelper = {
@@ -46564,7 +58031,8 @@ var ts;
     };
     function createReadHelper(context, iteratorRecord, count, location) {
         context.requestEmitHelper(readHelper);
-        return ts.setTextRange(ts.createCall(getHelperName("__read"), undefined, count !== undefined
+        return ts.setTextRange(ts.createCall(getHelperName("__read"), 
+        /*typeArguments*/ undefined, count !== undefined
             ? [iteratorRecord, ts.createLiteral(count)]
             : [iteratorRecord]), location);
     }
@@ -46577,18 +58045,23 @@ var ts;
     function createSpreadHelper(context, argumentList, location) {
         context.requestEmitHelper(readHelper);
         context.requestEmitHelper(spreadHelper);
-        return ts.setTextRange(ts.createCall(getHelperName("__spread"), undefined, argumentList), location);
+        return ts.setTextRange(ts.createCall(getHelperName("__spread"), 
+        /*typeArguments*/ undefined, argumentList), location);
     }
     ts.createSpreadHelper = createSpreadHelper;
+    // Utilities
     function createForOfBindingStatement(node, boundValue) {
         if (ts.isVariableDeclarationList(node)) {
             var firstDeclaration = ts.first(node.declarations);
-            var updatedDeclaration = ts.updateVariableDeclaration(firstDeclaration, firstDeclaration.name, undefined, boundValue);
-            return ts.setTextRange(ts.createVariableStatement(undefined, ts.updateVariableDeclarationList(node, [updatedDeclaration])), node);
+            var updatedDeclaration = ts.updateVariableDeclaration(firstDeclaration, firstDeclaration.name, 
+            /*typeNode*/ undefined, boundValue);
+            return ts.setTextRange(ts.createVariableStatement(
+            /*modifiers*/ undefined, ts.updateVariableDeclarationList(node, [updatedDeclaration])), 
+            /*location*/ node);
         }
         else {
-            var updatedExpression = ts.setTextRange(ts.createAssignment(node, boundValue), node);
-            return ts.setTextRange(ts.createStatement(updatedExpression), node);
+            var updatedExpression = ts.setTextRange(ts.createAssignment(node, boundValue), /*location*/ node);
+            return ts.setTextRange(ts.createStatement(updatedExpression), /*location*/ node);
         }
     }
     ts.createForOfBindingStatement = createForOfBindingStatement;
@@ -46597,7 +58070,7 @@ var ts;
             return ts.updateBlock(dest, ts.setTextRange(ts.createNodeArray([source].concat(dest.statements)), dest.statements));
         }
         else {
-            return ts.createBlock(ts.createNodeArray([dest, source]), true);
+            return ts.createBlock(ts.createNodeArray([dest, source]), /*multiLine*/ true);
         }
     }
     ts.insertLeadingStatement = insertLeadingStatement;
@@ -46605,7 +58078,7 @@ var ts;
         if (!outermostLabeledStatement) {
             return node;
         }
-        var updated = ts.updateLabel(outermostLabeledStatement, outermostLabeledStatement.label, outermostLabeledStatement.statement.kind === 228
+        var updated = ts.updateLabel(outermostLabeledStatement, outermostLabeledStatement.label, outermostLabeledStatement.statement.kind === 228 /* LabeledStatement */
             ? restoreEnclosingLabel(node, outermostLabeledStatement.statement)
             : node);
         if (afterRestoreLabelCallback) {
@@ -46617,19 +58090,19 @@ var ts;
     function shouldBeCapturedInTempVariable(node, cacheIdentifiers) {
         var target = ts.skipParentheses(node);
         switch (target.kind) {
-            case 71:
+            case 71 /* Identifier */:
                 return cacheIdentifiers;
-            case 99:
-            case 8:
-            case 9:
+            case 99 /* ThisKeyword */:
+            case 8 /* NumericLiteral */:
+            case 9 /* StringLiteral */:
                 return false;
-            case 183:
+            case 183 /* ArrayLiteralExpression */:
                 var elements = target.elements;
                 if (elements.length === 0) {
                     return false;
                 }
                 return true;
-            case 184:
+            case 184 /* ObjectLiteralExpression */:
                 return target.properties.length > 0;
             default:
                 return true;
@@ -46637,27 +58110,28 @@ var ts;
     }
     function createCallBinding(expression, recordTempVariable, languageVersion, cacheIdentifiers) {
         if (cacheIdentifiers === void 0) { cacheIdentifiers = false; }
-        var callee = skipOuterExpressions(expression, 7);
+        var callee = skipOuterExpressions(expression, 7 /* All */);
         var thisArg;
         var target;
         if (ts.isSuperProperty(callee)) {
             thisArg = ts.createThis();
             target = callee;
         }
-        else if (callee.kind === 97) {
+        else if (callee.kind === 97 /* SuperKeyword */) {
             thisArg = ts.createThis();
-            target = languageVersion < 2
+            target = languageVersion < 2 /* ES2015 */
                 ? ts.setTextRange(ts.createIdentifier("_super"), callee)
                 : callee;
         }
-        else if (ts.getEmitFlags(callee) & 4096) {
+        else if (ts.getEmitFlags(callee) & 4096 /* HelperName */) {
             thisArg = ts.createVoidZero();
             target = parenthesizeForAccess(callee);
         }
         else {
             switch (callee.kind) {
-                case 185: {
+                case 185 /* PropertyAccessExpression */: {
                     if (shouldBeCapturedInTempVariable(callee.expression, cacheIdentifiers)) {
+                        // for `a.b()` target is `(_a = a).b` and thisArg is `_a`
                         thisArg = ts.createTempVariable(recordTempVariable);
                         target = ts.createPropertyAccess(ts.setTextRange(ts.createAssignment(thisArg, callee.expression), callee.expression), callee.name);
                         ts.setTextRange(target, callee);
@@ -46668,8 +58142,9 @@ var ts;
                     }
                     break;
                 }
-                case 186: {
+                case 186 /* ElementAccessExpression */: {
                     if (shouldBeCapturedInTempVariable(callee.expression, cacheIdentifiers)) {
+                        // for `a[b]()` target is `(_a = a)[b]` and thisArg is `_a`
                         thisArg = ts.createTempVariable(recordTempVariable);
                         target = ts.createElementAccess(ts.setTextRange(ts.createAssignment(thisArg, callee.expression), callee.expression), callee.argumentExpression);
                         ts.setTextRange(target, callee);
@@ -46681,6 +58156,7 @@ var ts;
                     break;
                 }
                 default: {
+                    // for `a()` target is `a` and thisArg is `void 0`
                     thisArg = ts.createVoidZero();
                     target = parenthesizeForAccess(expression);
                     break;
@@ -46691,6 +58167,8 @@ var ts;
     }
     ts.createCallBinding = createCallBinding;
     function inlineExpressions(expressions) {
+        // Avoid deeply nested comma expressions as traversing them during emit can result in "Maximum call
+        // stack size exceeded" errors.
         return expressions.length > 10
             ? ts.createCommaList(expressions)
             : ts.reduceLeft(expressions, ts.createComma);
@@ -46721,14 +58199,14 @@ var ts;
     ts.createExpressionForPropertyName = createExpressionForPropertyName;
     function createExpressionForObjectLiteralElementLike(node, property, receiver) {
         switch (property.kind) {
-            case 156:
-            case 157:
+            case 156 /* GetAccessor */:
+            case 157 /* SetAccessor */:
                 return createExpressionForAccessorDeclaration(node.properties, property, receiver, !!node.multiLine);
-            case 270:
+            case 270 /* PropertyAssignment */:
                 return createExpressionForPropertyAssignment(property, receiver);
-            case 271:
+            case 271 /* ShorthandPropertyAssignment */:
                 return createExpressionForShorthandPropertyAssignment(property, receiver);
-            case 154:
+            case 154 /* MethodDeclaration */:
                 return createExpressionForMethodDeclaration(property, receiver);
         }
     }
@@ -46738,14 +58216,24 @@ var ts;
         if (property === firstAccessor) {
             var properties_9 = [];
             if (getAccessor) {
-                var getterFunction = ts.createFunctionExpression(getAccessor.modifiers, undefined, undefined, undefined, getAccessor.parameters, undefined, getAccessor.body);
+                var getterFunction = ts.createFunctionExpression(getAccessor.modifiers, 
+                /*asteriskToken*/ undefined, 
+                /*name*/ undefined, 
+                /*typeParameters*/ undefined, getAccessor.parameters, 
+                /*type*/ undefined, getAccessor.body // TODO: GH#18217
+                );
                 ts.setTextRange(getterFunction, getAccessor);
                 ts.setOriginalNode(getterFunction, getAccessor);
                 var getter = ts.createPropertyAssignment("get", getterFunction);
                 properties_9.push(getter);
             }
             if (setAccessor) {
-                var setterFunction = ts.createFunctionExpression(setAccessor.modifiers, undefined, undefined, undefined, setAccessor.parameters, undefined, setAccessor.body);
+                var setterFunction = ts.createFunctionExpression(setAccessor.modifiers, 
+                /*asteriskToken*/ undefined, 
+                /*name*/ undefined, 
+                /*typeParameters*/ undefined, setAccessor.parameters, 
+                /*type*/ undefined, setAccessor.body // TODO: GH#18217
+                );
                 ts.setTextRange(setterFunction, setAccessor);
                 ts.setOriginalNode(setterFunction, setAccessor);
                 var setter = ts.createPropertyAssignment("set", setterFunction);
@@ -46753,48 +58241,108 @@ var ts;
             }
             properties_9.push(ts.createPropertyAssignment("enumerable", ts.createTrue()));
             properties_9.push(ts.createPropertyAssignment("configurable", ts.createTrue()));
-            var expression = ts.setTextRange(ts.createCall(ts.createPropertyAccess(ts.createIdentifier("Object"), "defineProperty"), undefined, [
+            var expression = ts.setTextRange(ts.createCall(ts.createPropertyAccess(ts.createIdentifier("Object"), "defineProperty"), 
+            /*typeArguments*/ undefined, [
                 receiver,
                 createExpressionForPropertyName(property.name),
                 ts.createObjectLiteral(properties_9, multiLine)
-            ]), firstAccessor);
+            ]), 
+            /*location*/ firstAccessor);
             return ts.aggregateTransformFlags(expression);
         }
         return undefined;
     }
     function createExpressionForPropertyAssignment(property, receiver) {
-        return ts.aggregateTransformFlags(ts.setOriginalNode(ts.setTextRange(ts.createAssignment(createMemberAccessForPropertyName(receiver, property.name, property.name), property.initializer), property), property));
+        return ts.aggregateTransformFlags(ts.setOriginalNode(ts.setTextRange(ts.createAssignment(createMemberAccessForPropertyName(receiver, property.name, /*location*/ property.name), property.initializer), property), property));
     }
     function createExpressionForShorthandPropertyAssignment(property, receiver) {
-        return ts.aggregateTransformFlags(ts.setOriginalNode(ts.setTextRange(ts.createAssignment(createMemberAccessForPropertyName(receiver, property.name, property.name), ts.getSynthesizedClone(property.name)), property), property));
+        return ts.aggregateTransformFlags(ts.setOriginalNode(ts.setTextRange(ts.createAssignment(createMemberAccessForPropertyName(receiver, property.name, /*location*/ property.name), ts.getSynthesizedClone(property.name)), 
+        /*location*/ property), 
+        /*original*/ property));
     }
     function createExpressionForMethodDeclaration(method, receiver) {
-        return ts.aggregateTransformFlags(ts.setOriginalNode(ts.setTextRange(ts.createAssignment(createMemberAccessForPropertyName(receiver, method.name, method.name), ts.setOriginalNode(ts.setTextRange(ts.createFunctionExpression(method.modifiers, method.asteriskToken, undefined, undefined, method.parameters, undefined, method.body), method), method)), method), method));
+        return ts.aggregateTransformFlags(ts.setOriginalNode(ts.setTextRange(ts.createAssignment(createMemberAccessForPropertyName(receiver, method.name, /*location*/ method.name), ts.setOriginalNode(ts.setTextRange(ts.createFunctionExpression(method.modifiers, method.asteriskToken, 
+        /*name*/ undefined, 
+        /*typeParameters*/ undefined, method.parameters, 
+        /*type*/ undefined, method.body // TODO: GH#18217
+        ), 
+        /*location*/ method), 
+        /*original*/ method)), 
+        /*location*/ method), 
+        /*original*/ method));
     }
+    /**
+     * Gets the internal name of a declaration. This is primarily used for declarations that can be
+     * referred to by name in the body of an ES5 class function body. An internal name will *never*
+     * be prefixed with an module or namespace export modifier like "exports." when emitted as an
+     * expression. An internal name will also *never* be renamed due to a collision with a block
+     * scoped variable.
+     *
+     * @param node The declaration.
+     * @param allowComments A value indicating whether comments may be emitted for the name.
+     * @param allowSourceMaps A value indicating whether source maps may be emitted for the name.
+     */
     function getInternalName(node, allowComments, allowSourceMaps) {
-        return getName(node, allowComments, allowSourceMaps, 16384 | 32768);
+        return getName(node, allowComments, allowSourceMaps, 16384 /* LocalName */ | 32768 /* InternalName */);
     }
     ts.getInternalName = getInternalName;
+    /**
+     * Gets whether an identifier should only be referred to by its internal name.
+     */
     function isInternalName(node) {
-        return (ts.getEmitFlags(node) & 32768) !== 0;
+        return (ts.getEmitFlags(node) & 32768 /* InternalName */) !== 0;
     }
     ts.isInternalName = isInternalName;
+    /**
+     * Gets the local name of a declaration. This is primarily used for declarations that can be
+     * referred to by name in the declaration's immediate scope (classes, enums, namespaces). A
+     * local name will *never* be prefixed with an module or namespace export modifier like
+     * "exports." when emitted as an expression.
+     *
+     * @param node The declaration.
+     * @param allowComments A value indicating whether comments may be emitted for the name.
+     * @param allowSourceMaps A value indicating whether source maps may be emitted for the name.
+     */
     function getLocalName(node, allowComments, allowSourceMaps) {
-        return getName(node, allowComments, allowSourceMaps, 16384);
+        return getName(node, allowComments, allowSourceMaps, 16384 /* LocalName */);
     }
     ts.getLocalName = getLocalName;
+    /**
+     * Gets whether an identifier should only be referred to by its local name.
+     */
     function isLocalName(node) {
-        return (ts.getEmitFlags(node) & 16384) !== 0;
+        return (ts.getEmitFlags(node) & 16384 /* LocalName */) !== 0;
     }
     ts.isLocalName = isLocalName;
+    /**
+     * Gets the export name of a declaration. This is primarily used for declarations that can be
+     * referred to by name in the declaration's immediate scope (classes, enums, namespaces). An
+     * export name will *always* be prefixed with an module or namespace export modifier like
+     * `"exports."` when emitted as an expression if the name points to an exported symbol.
+     *
+     * @param node The declaration.
+     * @param allowComments A value indicating whether comments may be emitted for the name.
+     * @param allowSourceMaps A value indicating whether source maps may be emitted for the name.
+     */
     function getExportName(node, allowComments, allowSourceMaps) {
-        return getName(node, allowComments, allowSourceMaps, 8192);
+        return getName(node, allowComments, allowSourceMaps, 8192 /* ExportName */);
     }
     ts.getExportName = getExportName;
+    /**
+     * Gets whether an identifier should only be referred to by its export representation if the
+     * name points to an exported symbol.
+     */
     function isExportName(node) {
-        return (ts.getEmitFlags(node) & 8192) !== 0;
+        return (ts.getEmitFlags(node) & 8192 /* ExportName */) !== 0;
     }
     ts.isExportName = isExportName;
+    /**
+     * Gets the name of a declaration for use in declarations.
+     *
+     * @param node The declaration.
+     * @param allowComments A value indicating whether comments may be emitted for the name.
+     * @param allowSourceMaps A value indicating whether source maps may be emitted for the name.
+     */
     function getDeclarationName(node, allowComments, allowSourceMaps) {
         return getName(node, allowComments, allowSourceMaps);
     }
@@ -46806,30 +58354,49 @@ var ts;
             var name = ts.getMutableClone(nodeName);
             emitFlags |= ts.getEmitFlags(nodeName);
             if (!allowSourceMaps)
-                emitFlags |= 48;
+                emitFlags |= 48 /* NoSourceMap */;
             if (!allowComments)
-                emitFlags |= 1536;
+                emitFlags |= 1536 /* NoComments */;
             if (emitFlags)
                 ts.setEmitFlags(name, emitFlags);
             return name;
         }
         return ts.getGeneratedNameForNode(node);
     }
+    /**
+     * Gets the exported name of a declaration for use in expressions.
+     *
+     * An exported name will *always* be prefixed with an module or namespace export modifier like
+     * "exports." if the name points to an exported symbol.
+     *
+     * @param ns The namespace identifier.
+     * @param node The declaration.
+     * @param allowComments A value indicating whether comments may be emitted for the name.
+     * @param allowSourceMaps A value indicating whether source maps may be emitted for the name.
+     */
     function getExternalModuleOrNamespaceExportName(ns, node, allowComments, allowSourceMaps) {
-        if (ns && ts.hasModifier(node, 1)) {
+        if (ns && ts.hasModifier(node, 1 /* Export */)) {
             return getNamespaceMemberName(ns, getName(node), allowComments, allowSourceMaps);
         }
         return getExportName(node, allowComments, allowSourceMaps);
     }
     ts.getExternalModuleOrNamespaceExportName = getExternalModuleOrNamespaceExportName;
+    /**
+     * Gets a namespace-qualified name for use in expressions.
+     *
+     * @param ns The namespace identifier.
+     * @param name The name.
+     * @param allowComments A value indicating whether comments may be emitted for the name.
+     * @param allowSourceMaps A value indicating whether source maps may be emitted for the name.
+     */
     function getNamespaceMemberName(ns, name, allowComments, allowSourceMaps) {
         var qualifiedName = ts.createPropertyAccess(ns, ts.nodeIsSynthesized(name) ? name : ts.getSynthesizedClone(name));
         ts.setTextRange(qualifiedName, name);
         var emitFlags = 0;
         if (!allowSourceMaps)
-            emitFlags |= 48;
+            emitFlags |= 48 /* NoSourceMap */;
         if (!allowComments)
-            emitFlags |= 1536;
+            emitFlags |= 1536 /* NoComments */;
         if (emitFlags)
             ts.setEmitFlags(qualifiedName, emitFlags);
         return qualifiedName;
@@ -46846,7 +58413,7 @@ var ts;
         ts.setOriginalNode(updated, node);
         ts.setTextRange(updated, node);
         if (ts.getStartsOnNewLine(node)) {
-            ts.setStartsOnNewLine(updated, true);
+            ts.setStartsOnNewLine(updated, /*newLine*/ true);
         }
         ts.aggregateTransformFlags(updated);
         return updated;
@@ -46855,11 +58422,28 @@ var ts;
     function isUseStrictPrologue(node) {
         return ts.isStringLiteral(node.expression) && node.expression.text === "use strict";
     }
+    /**
+     * Add any necessary prologue-directives into target statement-array.
+     * The function needs to be called during each transformation step.
+     * This function needs to be called whenever we transform the statement
+     * list of a source file, namespace, or function-like body.
+     *
+     * @param target: result statements array
+     * @param source: origin statements array
+     * @param ensureUseStrict: boolean determining whether the function need to add prologue-directives
+     * @param visitor: Optional callback used to visit any custom prologue directives.
+     */
     function addPrologue(target, source, ensureUseStrict, visitor) {
         var offset = addStandardPrologue(target, source, ensureUseStrict);
         return addCustomPrologue(target, source, offset, visitor);
     }
     ts.addPrologue = addPrologue;
+    /**
+     * Add just the standard (string-expression) prologue-directives into target statement-array.
+     * The function needs to be called during each transformation step.
+     * This function needs to be called whenever we transform the statement
+     * list of a source file, namespace, or function-like body.
+     */
     function addStandardPrologue(target, source, ensureUseStrict) {
         ts.Debug.assert(target.length === 0, "Prologue directives should be at the first statement in the target statements array");
         var foundUseStrict = false;
@@ -46888,7 +58472,7 @@ var ts;
         var numStatements = source.length;
         while (statementOffset !== undefined && statementOffset < numStatements) {
             var statement = source[statementOffset];
-            if (ts.getEmitFlags(statement) & 1048576) {
+            if (ts.getEmitFlags(statement) & 1048576 /* CustomPrologue */) {
                 ts.append(target, visitor ? ts.visitNode(statement, visitor, ts.isStatement) : statement);
             }
             else {
@@ -46906,6 +58490,11 @@ var ts;
             && isUseStrictPrologue(firstStatement);
     }
     ts.startsWithUseStrict = startsWithUseStrict;
+    /**
+     * Ensures "use strict" directive is added
+     *
+     * @param statements An array of statements
+     */
     function ensureUseStrict(statements) {
         var foundUseStrict = false;
         for (var _i = 0, statements_3 = statements; _i < statements_3.length; _i++) {
@@ -46928,9 +58517,19 @@ var ts;
         return statements;
     }
     ts.ensureUseStrict = ensureUseStrict;
+    /**
+     * Wraps the operand to a BinaryExpression in parentheses if they are needed to preserve the intended
+     * order of operations.
+     *
+     * @param binaryOperator The operator for the BinaryExpression.
+     * @param operand The operand for the BinaryExpression.
+     * @param isLeftSideOfBinary A value indicating whether the operand is the left side of the
+     *                           BinaryExpression.
+     */
     function parenthesizeBinaryOperand(binaryOperator, operand, isLeftSideOfBinary, leftOperand) {
         var skipped = ts.skipPartiallyEmittedExpressions(operand);
-        if (skipped.kind === 191) {
+        // If the resulting expression is already parenthesized, we do not need to do any further processing.
+        if (skipped.kind === 191 /* ParenthesizedExpression */) {
             return operand;
         }
         return binaryOperandNeedsParentheses(binaryOperator, operand, isLeftSideOfBinary, leftOperand)
@@ -46938,55 +58537,131 @@ var ts;
             : operand;
     }
     ts.parenthesizeBinaryOperand = parenthesizeBinaryOperand;
+    /**
+     * Determines whether the operand to a BinaryExpression needs to be parenthesized.
+     *
+     * @param binaryOperator The operator for the BinaryExpression.
+     * @param operand The operand for the BinaryExpression.
+     * @param isLeftSideOfBinary A value indicating whether the operand is the left side of the
+     *                           BinaryExpression.
+     */
     function binaryOperandNeedsParentheses(binaryOperator, operand, isLeftSideOfBinary, leftOperand) {
-        var binaryOperatorPrecedence = ts.getOperatorPrecedence(200, binaryOperator);
-        var binaryOperatorAssociativity = ts.getOperatorAssociativity(200, binaryOperator);
+        // If the operand has lower precedence, then it needs to be parenthesized to preserve the
+        // intent of the expression. For example, if the operand is `a + b` and the operator is
+        // `*`, then we need to parenthesize the operand to preserve the intended order of
+        // operations: `(a + b) * x`.
+        //
+        // If the operand has higher precedence, then it does not need to be parenthesized. For
+        // example, if the operand is `a * b` and the operator is `+`, then we do not need to
+        // parenthesize to preserve the intended order of operations: `a * b + x`.
+        //
+        // If the operand has the same precedence, then we need to check the associativity of
+        // the operator based on whether this is the left or right operand of the expression.
+        //
+        // For example, if `a / d` is on the right of operator `*`, we need to parenthesize
+        // to preserve the intended order of operations: `x * (a / d)`
+        //
+        // If `a ** d` is on the left of operator `**`, we need to parenthesize to preserve
+        // the intended order of operations: `(a ** b) ** c`
+        var binaryOperatorPrecedence = ts.getOperatorPrecedence(200 /* BinaryExpression */, binaryOperator);
+        var binaryOperatorAssociativity = ts.getOperatorAssociativity(200 /* BinaryExpression */, binaryOperator);
         var emittedOperand = ts.skipPartiallyEmittedExpressions(operand);
         var operandPrecedence = ts.getExpressionPrecedence(emittedOperand);
         switch (ts.compareValues(operandPrecedence, binaryOperatorPrecedence)) {
-            case -1:
+            case -1 /* LessThan */:
+                // If the operand is the right side of a right-associative binary operation
+                // and is a yield expression, then we do not need parentheses.
                 if (!isLeftSideOfBinary
-                    && binaryOperatorAssociativity === 1
-                    && operand.kind === 203) {
+                    && binaryOperatorAssociativity === 1 /* Right */
+                    && operand.kind === 203 /* YieldExpression */) {
                     return false;
                 }
                 return true;
-            case 1:
+            case 1 /* GreaterThan */:
                 return false;
-            case 0:
+            case 0 /* EqualTo */:
                 if (isLeftSideOfBinary) {
-                    return binaryOperatorAssociativity === 1;
+                    // No need to parenthesize the left operand when the binary operator is
+                    // left associative:
+                    //  (a*b)/x    -> a*b/x
+                    //  (a**b)/x   -> a**b/x
+                    //
+                    // Parentheses are needed for the left operand when the binary operator is
+                    // right associative:
+                    //  (a/b)**x   -> (a/b)**x
+                    //  (a**b)**x  -> (a**b)**x
+                    return binaryOperatorAssociativity === 1 /* Right */;
                 }
                 else {
                     if (ts.isBinaryExpression(emittedOperand)
                         && emittedOperand.operatorToken.kind === binaryOperator) {
+                        // No need to parenthesize the right operand when the binary operator and
+                        // operand are the same and one of the following:
+                        //  x*(a*b)     => x*a*b
+                        //  x|(a|b)     => x|a|b
+                        //  x&(a&b)     => x&a&b
+                        //  x^(a^b)     => x^a^b
                         if (operatorHasAssociativeProperty(binaryOperator)) {
                             return false;
                         }
-                        if (binaryOperator === 37) {
-                            var leftKind = leftOperand ? getLiteralKindOfBinaryPlusOperand(leftOperand) : 0;
+                        // No need to parenthesize the right operand when the binary operator
+                        // is plus (+) if both the left and right operands consist solely of either
+                        // literals of the same kind or binary plus (+) expressions for literals of
+                        // the same kind (recursively).
+                        //  "a"+(1+2)       => "a"+(1+2)
+                        //  "a"+("b"+"c")   => "a"+"b"+"c"
+                        if (binaryOperator === 37 /* PlusToken */) {
+                            var leftKind = leftOperand ? getLiteralKindOfBinaryPlusOperand(leftOperand) : 0 /* Unknown */;
                             if (ts.isLiteralKind(leftKind) && leftKind === getLiteralKindOfBinaryPlusOperand(emittedOperand)) {
                                 return false;
                             }
                         }
                     }
+                    // No need to parenthesize the right operand when the operand is right
+                    // associative:
+                    //  x/(a**b)    -> x/a**b
+                    //  x**(a**b)   -> x**a**b
+                    //
+                    // Parentheses are needed for the right operand when the operand is left
+                    // associative:
+                    //  x/(a*b)     -> x/(a*b)
+                    //  x**(a/b)    -> x**(a/b)
                     var operandAssociativity = ts.getExpressionAssociativity(emittedOperand);
-                    return operandAssociativity === 0;
+                    return operandAssociativity === 0 /* Left */;
                 }
         }
     }
+    /**
+     * Determines whether a binary operator is mathematically associative.
+     *
+     * @param binaryOperator The binary operator.
+     */
     function operatorHasAssociativeProperty(binaryOperator) {
-        return binaryOperator === 39
-            || binaryOperator === 49
-            || binaryOperator === 48
-            || binaryOperator === 50;
+        // The following operators are associative in JavaScript:
+        //  (a*b)*c     -> a*(b*c)  -> a*b*c
+        //  (a|b)|c     -> a|(b|c)  -> a|b|c
+        //  (a&b)&c     -> a&(b&c)  -> a&b&c
+        //  (a^b)^c     -> a^(b^c)  -> a^b^c
+        //
+        // While addition is associative in mathematics, JavaScript's `+` is not
+        // guaranteed to be associative as it is overloaded with string concatenation.
+        return binaryOperator === 39 /* AsteriskToken */
+            || binaryOperator === 49 /* BarToken */
+            || binaryOperator === 48 /* AmpersandToken */
+            || binaryOperator === 50 /* CaretToken */;
     }
+    /**
+     * This function determines whether an expression consists of a homogeneous set of
+     * literal expressions or binary plus expressions that all share the same literal kind.
+     * It is used to determine whether the right-hand operand of a binary plus expression can be
+     * emitted without parentheses.
+     */
     function getLiteralKindOfBinaryPlusOperand(node) {
         node = ts.skipPartiallyEmittedExpressions(node);
         if (ts.isLiteralKind(node.kind)) {
             return node.kind;
         }
-        if (node.kind === 200 && node.operatorToken.kind === 37) {
+        if (node.kind === 200 /* BinaryExpression */ && node.operatorToken.kind === 37 /* PlusToken */) {
             if (node.cachedLiteralKind !== undefined) {
                 return node.cachedLiteralKind;
             }
@@ -46994,46 +58669,66 @@ var ts;
             var literalKind = ts.isLiteralKind(leftKind)
                 && leftKind === getLiteralKindOfBinaryPlusOperand(node.right)
                 ? leftKind
-                : 0;
+                : 0 /* Unknown */;
             node.cachedLiteralKind = literalKind;
             return literalKind;
         }
-        return 0;
+        return 0 /* Unknown */;
     }
     function parenthesizeForConditionalHead(condition) {
-        var conditionalPrecedence = ts.getOperatorPrecedence(201, 55);
+        var conditionalPrecedence = ts.getOperatorPrecedence(201 /* ConditionalExpression */, 55 /* QuestionToken */);
         var emittedCondition = ts.skipPartiallyEmittedExpressions(condition);
         var conditionPrecedence = ts.getExpressionPrecedence(emittedCondition);
-        if (ts.compareValues(conditionPrecedence, conditionalPrecedence) === -1) {
+        if (ts.compareValues(conditionPrecedence, conditionalPrecedence) === -1 /* LessThan */) {
             return ts.createParen(condition);
         }
         return condition;
     }
     ts.parenthesizeForConditionalHead = parenthesizeForConditionalHead;
     function parenthesizeSubexpressionOfConditionalExpression(e) {
+        // per ES grammar both 'whenTrue' and 'whenFalse' parts of conditional expression are assignment expressions
+        // so in case when comma expression is introduced as a part of previous transformations
+        // if should be wrapped in parens since comma operator has the lowest precedence
         var emittedExpression = ts.skipPartiallyEmittedExpressions(e);
-        return emittedExpression.kind === 200 && emittedExpression.operatorToken.kind === 26 ||
-            emittedExpression.kind === 302
+        return emittedExpression.kind === 200 /* BinaryExpression */ && emittedExpression.operatorToken.kind === 26 /* CommaToken */ ||
+            emittedExpression.kind === 302 /* CommaListExpression */
             ? ts.createParen(e)
             : e;
     }
     ts.parenthesizeSubexpressionOfConditionalExpression = parenthesizeSubexpressionOfConditionalExpression;
+    /**
+     *  [Per the spec](https://tc39.github.io/ecma262/#prod-ExportDeclaration), `export default` accepts _AssigmentExpression_ but
+     *  has a lookahead restriction for `function`, `async function`, and `class`.
+     *
+     * Basically, that means we need to parenthesize in the following cases:
+     *
+     * - BinaryExpression of CommaToken
+     * - CommaList (synthetic list of multiple comma expressions)
+     * - FunctionExpression
+     * - ClassExpression
+     */
     function parenthesizeDefaultExpression(e) {
         var check = ts.skipPartiallyEmittedExpressions(e);
-        return (check.kind === 205 ||
-            check.kind === 192 ||
-            check.kind === 302 ||
-            ts.isBinaryExpression(check) && check.operatorToken.kind === 26)
+        return (check.kind === 205 /* ClassExpression */ ||
+            check.kind === 192 /* FunctionExpression */ ||
+            check.kind === 302 /* CommaListExpression */ ||
+            ts.isBinaryExpression(check) && check.operatorToken.kind === 26 /* CommaToken */)
             ? ts.createParen(e)
             : e;
     }
     ts.parenthesizeDefaultExpression = parenthesizeDefaultExpression;
+    /**
+     * Wraps an expression in parentheses if it is needed in order to use the expression
+     * as the expression of a NewExpression node.
+     *
+     * @param expression The Expression node.
+     */
     function parenthesizeForNew(expression) {
-        var leftmostExpr = getLeftmostExpression(expression, true);
+        var leftmostExpr = getLeftmostExpression(expression, /*stopAtCallExpressions*/ true);
         switch (leftmostExpr.kind) {
-            case 187:
+            case 187 /* CallExpression */:
                 return ts.createParen(expression);
-            case 188:
+            case 188 /* NewExpression */:
                 return !leftmostExpr.arguments
                     ? ts.createParen(expression)
                     : expression;
@@ -47041,10 +58736,22 @@ var ts;
         return parenthesizeForAccess(expression);
     }
     ts.parenthesizeForNew = parenthesizeForNew;
+    /**
+     * Wraps an expression in parentheses if it is needed in order to use the expression for
+     * property or element access.
+     *
+     * @param expr The expression node.
+     */
     function parenthesizeForAccess(expression) {
+        // isLeftHandSideExpression is almost the correct criterion for when it is not necessary
+        // to parenthesize the expression before a dot. The known exception is:
+        //
+        //    NewExpression:
+        //       new C.x        -> not the same as (new C).x
+        //
         var emittedExpression = ts.skipPartiallyEmittedExpressions(expression);
         if (ts.isLeftHandSideExpression(emittedExpression)
-            && (emittedExpression.kind !== 188 || emittedExpression.arguments)) {
+            && (emittedExpression.kind !== 188 /* NewExpression */ || emittedExpression.arguments)) {
             return expression;
         }
         return ts.setTextRange(ts.createParen(expression), expression);
@@ -47082,7 +58789,7 @@ var ts;
     function parenthesizeExpressionForList(expression) {
         var emittedExpression = ts.skipPartiallyEmittedExpressions(expression);
         var expressionPrecedence = ts.getExpressionPrecedence(emittedExpression);
-        var commaPrecedence = ts.getOperatorPrecedence(200, 26);
+        var commaPrecedence = ts.getOperatorPrecedence(200 /* BinaryExpression */, 26 /* CommaToken */);
         return expressionPrecedence > commaPrecedence
             ? expression
             : ts.setTextRange(ts.createParen(expression), expression);
@@ -47093,29 +58800,29 @@ var ts;
         if (ts.isCallExpression(emittedExpression)) {
             var callee = emittedExpression.expression;
             var kind = ts.skipPartiallyEmittedExpressions(callee).kind;
-            if (kind === 192 || kind === 193) {
+            if (kind === 192 /* FunctionExpression */ || kind === 193 /* ArrowFunction */) {
                 var mutableCall = ts.getMutableClone(emittedExpression);
                 mutableCall.expression = ts.setTextRange(ts.createParen(callee), callee);
-                return recreateOuterExpressions(expression, mutableCall, 4);
+                return recreateOuterExpressions(expression, mutableCall, 4 /* PartiallyEmittedExpressions */);
             }
         }
-        var leftmostExpressionKind = getLeftmostExpression(emittedExpression, false).kind;
-        if (leftmostExpressionKind === 184 || leftmostExpressionKind === 192) {
+        var leftmostExpressionKind = getLeftmostExpression(emittedExpression, /*stopAtCallExpressions*/ false).kind;
+        if (leftmostExpressionKind === 184 /* ObjectLiteralExpression */ || leftmostExpressionKind === 192 /* FunctionExpression */) {
             return ts.setTextRange(ts.createParen(expression), expression);
         }
         return expression;
     }
     ts.parenthesizeExpressionForExpressionStatement = parenthesizeExpressionForExpressionStatement;
     function parenthesizeConditionalTypeMember(member) {
-        return member.kind === 171 ? ts.createParenthesizedType(member) : member;
+        return member.kind === 171 /* ConditionalType */ ? ts.createParenthesizedType(member) : member;
     }
     ts.parenthesizeConditionalTypeMember = parenthesizeConditionalTypeMember;
     function parenthesizeElementTypeMember(member) {
         switch (member.kind) {
-            case 169:
-            case 170:
-            case 163:
-            case 164:
+            case 169 /* UnionType */:
+            case 170 /* IntersectionType */:
+            case 163 /* FunctionType */:
+            case 164 /* ConstructorType */:
                 return ts.createParenthesizedType(member);
         }
         return parenthesizeConditionalTypeMember(member);
@@ -47123,9 +58830,9 @@ var ts;
     ts.parenthesizeElementTypeMember = parenthesizeElementTypeMember;
     function parenthesizeArrayTypeMember(member) {
         switch (member.kind) {
-            case 165:
-            case 175:
-            case 172:
+            case 165 /* TypeQuery */:
+            case 175 /* TypeOperator */:
+            case 172 /* InferType */:
                 return ts.createParenthesizedType(member);
         }
         return parenthesizeElementTypeMember(member);
@@ -47151,24 +58858,25 @@ var ts;
     function getLeftmostExpression(node, stopAtCallExpressions) {
         while (true) {
             switch (node.kind) {
-                case 199:
+                case 199 /* PostfixUnaryExpression */:
                     node = node.operand;
                     continue;
-                case 200:
+                case 200 /* BinaryExpression */:
                     node = node.left;
                     continue;
-                case 201:
+                case 201 /* ConditionalExpression */:
                     node = node.condition;
                     continue;
-                case 187:
+                case 187 /* CallExpression */:
                     if (stopAtCallExpressions) {
                         return node;
                     }
-                case 186:
-                case 185:
+                // falls through
+                case 186 /* ElementAccessExpression */:
+                case 185 /* PropertyAccessExpression */:
                     node = node.expression;
                     continue;
-                case 301:
+                case 301 /* PartiallyEmittedExpression */:
                     node = node.expression;
                     continue;
             }
@@ -47176,39 +58884,46 @@ var ts;
         }
     }
     function parenthesizeConciseBody(body) {
-        if (!ts.isBlock(body) && getLeftmostExpression(body, false).kind === 184) {
+        if (!ts.isBlock(body) && getLeftmostExpression(body, /*stopAtCallExpressions*/ false).kind === 184 /* ObjectLiteralExpression */) {
             return ts.setTextRange(ts.createParen(body), body);
         }
         return body;
     }
     ts.parenthesizeConciseBody = parenthesizeConciseBody;
+    var OuterExpressionKinds;
+    (function (OuterExpressionKinds) {
+        OuterExpressionKinds[OuterExpressionKinds["Parentheses"] = 1] = "Parentheses";
+        OuterExpressionKinds[OuterExpressionKinds["Assertions"] = 2] = "Assertions";
+        OuterExpressionKinds[OuterExpressionKinds["PartiallyEmittedExpressions"] = 4] = "PartiallyEmittedExpressions";
+        OuterExpressionKinds[OuterExpressionKinds["All"] = 7] = "All";
+    })(OuterExpressionKinds = ts.OuterExpressionKinds || (ts.OuterExpressionKinds = {}));
     function isOuterExpression(node, kinds) {
-        if (kinds === void 0) { kinds = 7; }
+        if (kinds === void 0) { kinds = 7 /* All */; }
         switch (node.kind) {
-            case 191:
-                return (kinds & 1) !== 0;
-            case 190:
-            case 208:
-            case 209:
-                return (kinds & 2) !== 0;
-            case 301:
-                return (kinds & 4) !== 0;
+            case 191 /* ParenthesizedExpression */:
+                return (kinds & 1 /* Parentheses */) !== 0;
+            case 190 /* TypeAssertionExpression */:
+            case 208 /* AsExpression */:
+            case 209 /* NonNullExpression */:
+                return (kinds & 2 /* Assertions */) !== 0;
+            case 301 /* PartiallyEmittedExpression */:
+                return (kinds & 4 /* PartiallyEmittedExpressions */) !== 0;
         }
         return false;
     }
     ts.isOuterExpression = isOuterExpression;
     function skipOuterExpressions(node, kinds) {
-        if (kinds === void 0) { kinds = 7; }
+        if (kinds === void 0) { kinds = 7 /* All */; }
         var previousNode;
         do {
             previousNode = node;
-            if (kinds & 1) {
+            if (kinds & 1 /* Parentheses */) {
                 node = ts.skipParentheses(node);
             }
-            if (kinds & 2) {
+            if (kinds & 2 /* Assertions */) {
                 node = skipAssertions(node);
             }
-            if (kinds & 4) {
+            if (kinds & 4 /* PartiallyEmittedExpressions */) {
                 node = ts.skipPartiallyEmittedExpressions(node);
             }
         } while (previousNode !== node);
@@ -47216,7 +58931,7 @@ var ts;
     }
     ts.skipOuterExpressions = skipOuterExpressions;
     function skipAssertions(node) {
-        while (ts.isAssertionExpression(node) || node.kind === 209) {
+        while (ts.isAssertionExpression(node) || node.kind === 209 /* NonNullExpression */) {
             node = node.expression;
         }
         return node;
@@ -47224,15 +58939,29 @@ var ts;
     ts.skipAssertions = skipAssertions;
     function updateOuterExpression(outerExpression, expression) {
         switch (outerExpression.kind) {
-            case 191: return ts.updateParen(outerExpression, expression);
-            case 190: return ts.updateTypeAssertion(outerExpression, outerExpression.type, expression);
-            case 208: return ts.updateAsExpression(outerExpression, expression, outerExpression.type);
-            case 209: return ts.updateNonNullExpression(outerExpression, expression);
-            case 301: return ts.updatePartiallyEmittedExpression(outerExpression, expression);
+            case 191 /* ParenthesizedExpression */: return ts.updateParen(outerExpression, expression);
+            case 190 /* TypeAssertionExpression */: return ts.updateTypeAssertion(outerExpression, outerExpression.type, expression);
+            case 208 /* AsExpression */: return ts.updateAsExpression(outerExpression, expression, outerExpression.type);
+            case 209 /* NonNullExpression */: return ts.updateNonNullExpression(outerExpression, expression);
+            case 301 /* PartiallyEmittedExpression */: return ts.updatePartiallyEmittedExpression(outerExpression, expression);
         }
     }
+    /**
+     * Determines whether a node is a parenthesized expression that can be ignored when recreating outer expressions.
+     *
+     * A parenthesized expression can be ignored when all of the following are true:
+     *
+     * - It's `pos` and `end` are not -1
+     * - It does not have a custom source map range
+     * - It does not have a custom comment range
+     * - It does not have synthetic leading or trailing comments
+     *
+     * If an outermost parenthesized expression is ignored, but the containing expression requires a parentheses around
+     * the expression to maintain precedence, a new parenthesized expression should be created automatically when
+     * the containing expression is created/updated.
+     */
     function isIgnorableParen(node) {
-        return node.kind === 191
+        return node.kind === 191 /* ParenthesizedExpression */
             && ts.nodeIsSynthesized(node)
             && ts.nodeIsSynthesized(ts.getSourceMapRange(node))
             && ts.nodeIsSynthesized(ts.getCommentRange(node))
@@ -47240,7 +58969,7 @@ var ts;
             && !ts.some(ts.getSyntheticTrailingComments(node));
     }
     function recreateOuterExpressions(outerExpression, innerExpression, kinds) {
-        if (kinds === void 0) { kinds = 7; }
+        if (kinds === void 0) { kinds = 7 /* All */; }
         if (outerExpression && isOuterExpression(outerExpression, kinds) && !isIgnorableParen(outerExpression)) {
             return updateOuterExpression(outerExpression, recreateOuterExpressions(outerExpression.expression, innerExpression));
         }
@@ -47248,7 +58977,7 @@ var ts;
     }
     ts.recreateOuterExpressions = recreateOuterExpressions;
     function startOnNewLine(node) {
-        return ts.setStartsOnNewLine(node, true);
+        return ts.setStartsOnNewLine(node, /*newLine*/ true);
     }
     ts.startOnNewLine = startOnNewLine;
     function getExternalHelpersModuleName(node) {
@@ -47288,24 +59017,35 @@ var ts;
         }
     }
     ts.getOrCreateExternalHelpersModuleNameIfNeeded = getOrCreateExternalHelpersModuleNameIfNeeded;
+    /**
+     * Get the name of that target module from an import or export declaration
+     */
     function getLocalNameForExternalImport(node, sourceFile) {
         var namespaceDeclaration = ts.getNamespaceDeclarationNode(node);
         if (namespaceDeclaration && !ts.isDefaultImport(node)) {
             var name = namespaceDeclaration.name;
             return ts.isGeneratedIdentifier(name) ? name : ts.createIdentifier(ts.getSourceTextOfNodeFromSourceFile(sourceFile, name) || ts.idText(name));
         }
-        if (node.kind === 244 && node.importClause) {
+        if (node.kind === 244 /* ImportDeclaration */ && node.importClause) {
             return ts.getGeneratedNameForNode(node);
         }
-        if (node.kind === 250 && node.moduleSpecifier) {
+        if (node.kind === 250 /* ExportDeclaration */ && node.moduleSpecifier) {
             return ts.getGeneratedNameForNode(node);
         }
         return undefined;
     }
     ts.getLocalNameForExternalImport = getLocalNameForExternalImport;
+    /**
+     * Get the name of a target module from an import/export declaration as should be written in the emitted output.
+     * The emitted output name can be different from the input if:
+     *  1. The module has a /// <amd-module name="<new name>" />
+     *  2. --out or --outFile is used, making the name relative to the rootDir
+     *  3- The containing SourceFile has an entry in renamedDependencies for the import as requested by some module loaders (e.g. System).
+     * Otherwise, a new StringLiteral node representing the module name will be returned.
+     */
     function getExternalModuleNameLiteral(importNode, sourceFile, host, resolver, compilerOptions) {
-        var moduleName = ts.getExternalModuleName(importNode);
-        if (moduleName.kind === 9) {
+        var moduleName = ts.getExternalModuleName(importNode); // TODO: GH#18217
+        if (moduleName.kind === 9 /* StringLiteral */) {
             return tryGetModuleNameFromDeclaration(importNode, host, resolver, compilerOptions)
                 || tryRenameExternalModule(moduleName, sourceFile)
                 || ts.getSynthesizedClone(moduleName);
@@ -47313,10 +59053,21 @@ var ts;
         return undefined;
     }
     ts.getExternalModuleNameLiteral = getExternalModuleNameLiteral;
+    /**
+     * Some bundlers (SystemJS builder) sometimes want to rename dependencies.
+     * Here we check if alternative name was provided for a given moduleName and return it if possible.
+     */
     function tryRenameExternalModule(moduleName, sourceFile) {
         var rename = sourceFile.renamedDependencies && sourceFile.renamedDependencies.get(moduleName.text);
         return rename && ts.createLiteral(rename);
     }
+    /**
+     * Get the name of a module as should be written in the emitted output.
+     * The emitted output name can be different from the input if:
+     *  1. The module has a /// <amd-module name="<new name>" />
+     *  2. --out or --outFile is used, making the name relative to the rootDir
+     * Otherwise, a new StringLiteral node representing the module name will be returned.
+     */
     function tryGetModuleNameFromFile(file, host, options) {
         if (!file) {
             return undefined;
@@ -47333,66 +59084,140 @@ var ts;
     function tryGetModuleNameFromDeclaration(declaration, host, resolver, compilerOptions) {
         return tryGetModuleNameFromFile(resolver.getExternalModuleFileFromDeclaration(declaration), host, compilerOptions);
     }
+    /**
+     * Gets the initializer of an BindingOrAssignmentElement.
+     */
     function getInitializerOfBindingOrAssignmentElement(bindingElement) {
         if (ts.isDeclarationBindingElement(bindingElement)) {
+            // `1` in `let { a = 1 } = ...`
+            // `1` in `let { a: b = 1 } = ...`
+            // `1` in `let { a: {b} = 1 } = ...`
+            // `1` in `let { a: [b] = 1 } = ...`
+            // `1` in `let [a = 1] = ...`
+            // `1` in `let [{a} = 1] = ...`
+            // `1` in `let [[a] = 1] = ...`
             return bindingElement.initializer;
         }
         if (ts.isPropertyAssignment(bindingElement)) {
+            // `1` in `({ a: b = 1 } = ...)`
+            // `1` in `({ a: {b} = 1 } = ...)`
+            // `1` in `({ a: [b] = 1 } = ...)`
             var initializer = bindingElement.initializer;
-            return ts.isAssignmentExpression(initializer, true)
+            return ts.isAssignmentExpression(initializer, /*excludeCompoundAssignment*/ true)
                 ? initializer.right
                 : undefined;
         }
         if (ts.isShorthandPropertyAssignment(bindingElement)) {
+            // `1` in `({ a = 1 } = ...)`
             return bindingElement.objectAssignmentInitializer;
         }
-        if (ts.isAssignmentExpression(bindingElement, true)) {
+        if (ts.isAssignmentExpression(bindingElement, /*excludeCompoundAssignment*/ true)) {
+            // `1` in `[a = 1] = ...`
+            // `1` in `[{a} = 1] = ...`
+            // `1` in `[[a] = 1] = ...`
             return bindingElement.right;
         }
         if (ts.isSpreadElement(bindingElement)) {
+            // Recovery consistent with existing emit.
             return getInitializerOfBindingOrAssignmentElement(bindingElement.expression);
         }
     }
     ts.getInitializerOfBindingOrAssignmentElement = getInitializerOfBindingOrAssignmentElement;
+    /**
+     * Gets the name of an BindingOrAssignmentElement.
+     */
     function getTargetOfBindingOrAssignmentElement(bindingElement) {
         if (ts.isDeclarationBindingElement(bindingElement)) {
+            // `a` in `let { a } = ...`
+            // `a` in `let { a = 1 } = ...`
+            // `b` in `let { a: b } = ...`
+            // `b` in `let { a: b = 1 } = ...`
+            // `a` in `let { ...a } = ...`
+            // `{b}` in `let { a: {b} } = ...`
+            // `{b}` in `let { a: {b} = 1 } = ...`
+            // `[b]` in `let { a: [b] } = ...`
+            // `[b]` in `let { a: [b] = 1 } = ...`
+            // `a` in `let [a] = ...`
+            // `a` in `let [a = 1] = ...`
+            // `a` in `let [...a] = ...`
+            // `{a}` in `let [{a}] = ...`
+            // `{a}` in `let [{a} = 1] = ...`
+            // `[a]` in `let [[a]] = ...`
+            // `[a]` in `let [[a] = 1] = ...`
             return bindingElement.name;
         }
         if (ts.isObjectLiteralElementLike(bindingElement)) {
             switch (bindingElement.kind) {
-                case 270:
+                case 270 /* PropertyAssignment */:
+                    // `b` in `({ a: b } = ...)`
+                    // `b` in `({ a: b = 1 } = ...)`
+                    // `{b}` in `({ a: {b} } = ...)`
+                    // `{b}` in `({ a: {b} = 1 } = ...)`
+                    // `[b]` in `({ a: [b] } = ...)`
+                    // `[b]` in `({ a: [b] = 1 } = ...)`
+                    // `b.c` in `({ a: b.c } = ...)`
+                    // `b.c` in `({ a: b.c = 1 } = ...)`
+                    // `b[0]` in `({ a: b[0] } = ...)`
+                    // `b[0]` in `({ a: b[0] = 1 } = ...)`
                     return getTargetOfBindingOrAssignmentElement(bindingElement.initializer);
-                case 271:
+                case 271 /* ShorthandPropertyAssignment */:
+                    // `a` in `({ a } = ...)`
+                    // `a` in `({ a = 1 } = ...)`
                     return bindingElement.name;
-                case 272:
+                case 272 /* SpreadAssignment */:
+                    // `a` in `({ ...a } = ...)`
                     return getTargetOfBindingOrAssignmentElement(bindingElement.expression);
             }
+            // no target
             return undefined;
         }
-        if (ts.isAssignmentExpression(bindingElement, true)) {
+        if (ts.isAssignmentExpression(bindingElement, /*excludeCompoundAssignment*/ true)) {
+            // `a` in `[a = 1] = ...`
+            // `{a}` in `[{a} = 1] = ...`
+            // `[a]` in `[[a] = 1] = ...`
+            // `a.b` in `[a.b = 1] = ...`
+            // `a[0]` in `[a[0] = 1] = ...`
             return getTargetOfBindingOrAssignmentElement(bindingElement.left);
         }
         if (ts.isSpreadElement(bindingElement)) {
+            // `a` in `[...a] = ...`
             return getTargetOfBindingOrAssignmentElement(bindingElement.expression);
         }
+        // `a` in `[a] = ...`
+        // `{a}` in `[{a}] = ...`
+        // `[a]` in `[[a]] = ...`
+        // `a.b` in `[a.b] = ...`
+        // `a[0]` in `[a[0]] = ...`
         return bindingElement;
     }
     ts.getTargetOfBindingOrAssignmentElement = getTargetOfBindingOrAssignmentElement;
+    /**
+     * Determines whether an BindingOrAssignmentElement is a rest element.
+     */
     function getRestIndicatorOfBindingOrAssignmentElement(bindingElement) {
         switch (bindingElement.kind) {
-            case 149:
-            case 182:
+            case 149 /* Parameter */:
+            case 182 /* BindingElement */:
+                // `...` in `let [...a] = ...`
                 return bindingElement.dotDotDotToken;
-            case 204:
-            case 272:
+            case 204 /* SpreadElement */:
+            case 272 /* SpreadAssignment */:
+                // `...` in `[...a] = ...`
                 return bindingElement;
         }
         return undefined;
     }
     ts.getRestIndicatorOfBindingOrAssignmentElement = getRestIndicatorOfBindingOrAssignmentElement;
+    /**
+     * Gets the property name of a BindingOrAssignmentElement
+     */
     function getPropertyNameOfBindingOrAssignmentElement(bindingElement) {
         switch (bindingElement.kind) {
-            case 182:
+            case 182 /* BindingElement */:
+                // `a` in `let { a: b } = ...`
+                // `[a]` in `let { [a]: b } = ...`
+                // `"a"` in `let { "a": b } = ...`
+                // `1` in `let { 1: b } = ...`
                 if (bindingElement.propertyName) {
                     var propertyName = bindingElement.propertyName;
                     return ts.isComputedPropertyName(propertyName) && ts.isStringOrNumericLiteral(propertyName.expression)
@@ -47400,7 +59225,11 @@ var ts;
                         : propertyName;
                 }
                 break;
-            case 270:
+            case 270 /* PropertyAssignment */:
+                // `a` in `({ a: b } = ...)`
+                // `[a]` in `({ [a]: b } = ...)`
+                // `"a"` in `({ "a": b } = ...)`
+                // `1` in `({ 1: b } = ...)`
                 if (bindingElement.name) {
                     var propertyName = bindingElement.name;
                     return ts.isComputedPropertyName(propertyName) && ts.isStringOrNumericLiteral(propertyName.expression)
@@ -47408,7 +59237,8 @@ var ts;
                         : propertyName;
                 }
                 break;
-            case 272:
+            case 272 /* SpreadAssignment */:
+                // `a` in `({ ...a } = ...)`
                 return bindingElement.name;
         }
         var target = getTargetOfBindingOrAssignmentElement(bindingElement);
@@ -47420,13 +59250,19 @@ var ts;
         ts.Debug.fail("Invalid property name for binding element.");
     }
     ts.getPropertyNameOfBindingOrAssignmentElement = getPropertyNameOfBindingOrAssignmentElement;
+    /**
+     * Gets the elements of a BindingOrAssignmentPattern
+     */
     function getElementsOfBindingOrAssignmentPattern(name) {
         switch (name.kind) {
-            case 180:
-            case 181:
-            case 183:
+            case 180 /* ObjectBindingPattern */:
+            case 181 /* ArrayBindingPattern */:
+            case 183 /* ArrayLiteralExpression */:
+                // `a` in `{a}`
+                // `a` in `[a]`
                 return name.elements;
-            case 184:
+            case 184 /* ObjectLiteralExpression */:
+                // `a` in `{a}`
                 return name.properties;
         }
     }
@@ -47465,11 +59301,11 @@ var ts;
     ts.convertToObjectAssignmentElement = convertToObjectAssignmentElement;
     function convertToAssignmentPattern(node) {
         switch (node.kind) {
-            case 181:
-            case 183:
+            case 181 /* ArrayBindingPattern */:
+            case 183 /* ArrayLiteralExpression */:
                 return convertToArrayAssignmentPattern(node);
-            case 180:
-            case 184:
+            case 180 /* ObjectBindingPattern */:
+            case 184 /* ObjectLiteralExpression */:
                 return convertToObjectAssignmentPattern(node);
         }
     }
@@ -47526,11 +59362,21 @@ var ts;
         return visitedNode;
     }
     ts.visitNode = visitNode;
+    /**
+     * Visits a NodeArray using the supplied visitor, possibly returning a new NodeArray in its place.
+     *
+     * @param nodes The NodeArray to visit.
+     * @param visitor The callback used to visit a Node.
+     * @param test A node test to execute for each node.
+     * @param start An optional value indicating the starting offset at which to start visiting.
+     * @param count An optional value indicating the maximum number of nodes to visit.
+     */
     function visitNodes(nodes, visitor, test, start, count) {
         if (nodes === undefined || visitor === undefined) {
             return nodes;
         }
         var updated;
+        // Ensure start and count have valid values
         var length = nodes.length;
         if (start === undefined || start < 0) {
             start = 0;
@@ -47539,14 +59385,19 @@ var ts;
             count = length - start;
         }
         if (start > 0 || count < length) {
-            updated = ts.createNodeArray([], nodes.hasTrailingComma && start + count === length);
+            // If we are not visiting all of the original nodes, we must always create a new array.
+            // Since this is a fragment of a node array, we do not copy over the previous location
+            // and will only copy over `hasTrailingComma` if we are including the last element.
+            updated = ts.createNodeArray([], /*hasTrailingComma*/ nodes.hasTrailingComma && start + count === length);
         }
+        // Visit each original node.
         for (var i = 0; i < count; i++) {
             var node = nodes[i + start];
             ts.aggregateTransformFlags(node);
             var visited = node !== undefined ? visitor(node) : undefined;
             if (updated !== undefined || visited === undefined || visited !== node) {
                 if (updated === undefined) {
+                    // Ensure we have a copy of `nodes`, up to the current index.
                     updated = ts.createNodeArray(nodes.slice(0, i), nodes.hasTrailingComma);
                     ts.setTextRange(updated, nodes);
                 }
@@ -47570,6 +59421,10 @@ var ts;
         return updated || nodes;
     }
     ts.visitNodes = visitNodes;
+    /**
+     * Starts a new lexical environment and visits a statement list, ending the lexical environment
+     * and merging hoisted declarations upon completion.
+     */
     function visitLexicalEnvironment(statements, visitor, context, start, ensureUseStrict) {
         context.startLexicalEnvironment();
         statements = visitNodes(statements, visitor, ts.isStatement, start);
@@ -47580,6 +59435,10 @@ var ts;
         return ts.setTextRange(ts.createNodeArray(ts.concatenate(declarations, statements)), statements);
     }
     ts.visitLexicalEnvironment = visitLexicalEnvironment;
+    /**
+     * Starts a new lexical environment and visits a parameter list, suspending the lexical
+     * environment upon completion.
+     */
     function visitParameterList(nodes, visitor, context, nodesVisitor) {
         if (nodesVisitor === void 0) { nodesVisitor = visitNodes; }
         context.startLexicalEnvironment();
@@ -47606,268 +59465,291 @@ var ts;
             return undefined;
         }
         var kind = node.kind;
-        if ((kind > 0 && kind <= 145) || kind === 174) {
+        // No need to visit nodes with no children.
+        if ((kind > 0 /* FirstToken */ && kind <= 145 /* LastToken */) || kind === 174 /* ThisType */) {
             return node;
         }
         switch (kind) {
-            case 71:
+            // Names
+            case 71 /* Identifier */:
                 return ts.updateIdentifier(node, nodesVisitor(node.typeArguments, visitor, isTypeNodeOrTypeParameterDeclaration));
-            case 146:
+            case 146 /* QualifiedName */:
                 return ts.updateQualifiedName(node, visitNode(node.left, visitor, ts.isEntityName), visitNode(node.right, visitor, ts.isIdentifier));
-            case 147:
+            case 147 /* ComputedPropertyName */:
                 return ts.updateComputedPropertyName(node, visitNode(node.expression, visitor, ts.isExpression));
-            case 148:
+            // Signature elements
+            case 148 /* TypeParameter */:
                 return ts.updateTypeParameterDeclaration(node, visitNode(node.name, visitor, ts.isIdentifier), visitNode(node.constraint, visitor, ts.isTypeNode), visitNode(node.default, visitor, ts.isTypeNode));
-            case 149:
+            case 149 /* Parameter */:
                 return ts.updateParameter(node, nodesVisitor(node.decorators, visitor, ts.isDecorator), nodesVisitor(node.modifiers, visitor, ts.isModifier), visitNode(node.dotDotDotToken, tokenVisitor, ts.isToken), visitNode(node.name, visitor, ts.isBindingName), visitNode(node.questionToken, tokenVisitor, ts.isToken), visitNode(node.type, visitor, ts.isTypeNode), visitNode(node.initializer, visitor, ts.isExpression));
-            case 150:
+            case 150 /* Decorator */:
                 return ts.updateDecorator(node, visitNode(node.expression, visitor, ts.isExpression));
-            case 151:
+            // Type elements
+            case 151 /* PropertySignature */:
                 return ts.updatePropertySignature(node, nodesVisitor(node.modifiers, visitor, ts.isToken), visitNode(node.name, visitor, ts.isPropertyName), visitNode(node.questionToken, tokenVisitor, ts.isToken), visitNode(node.type, visitor, ts.isTypeNode), visitNode(node.initializer, visitor, ts.isExpression));
-            case 152:
+            case 152 /* PropertyDeclaration */:
                 return ts.updateProperty(node, nodesVisitor(node.decorators, visitor, ts.isDecorator), nodesVisitor(node.modifiers, visitor, ts.isModifier), visitNode(node.name, visitor, ts.isPropertyName), visitNode(node.questionToken, tokenVisitor, ts.isToken), visitNode(node.type, visitor, ts.isTypeNode), visitNode(node.initializer, visitor, ts.isExpression));
-            case 153:
+            case 153 /* MethodSignature */:
                 return ts.updateMethodSignature(node, nodesVisitor(node.typeParameters, visitor, ts.isTypeParameterDeclaration), nodesVisitor(node.parameters, visitor, ts.isParameterDeclaration), visitNode(node.type, visitor, ts.isTypeNode), visitNode(node.name, visitor, ts.isPropertyName), visitNode(node.questionToken, tokenVisitor, ts.isToken));
-            case 154:
+            case 154 /* MethodDeclaration */:
                 return ts.updateMethod(node, nodesVisitor(node.decorators, visitor, ts.isDecorator), nodesVisitor(node.modifiers, visitor, ts.isModifier), visitNode(node.asteriskToken, tokenVisitor, ts.isToken), visitNode(node.name, visitor, ts.isPropertyName), visitNode(node.questionToken, tokenVisitor, ts.isToken), nodesVisitor(node.typeParameters, visitor, ts.isTypeParameterDeclaration), visitParameterList(node.parameters, visitor, context, nodesVisitor), visitNode(node.type, visitor, ts.isTypeNode), visitFunctionBody(node.body, visitor, context));
-            case 155:
+            case 155 /* Constructor */:
                 return ts.updateConstructor(node, nodesVisitor(node.decorators, visitor, ts.isDecorator), nodesVisitor(node.modifiers, visitor, ts.isModifier), visitParameterList(node.parameters, visitor, context, nodesVisitor), visitFunctionBody(node.body, visitor, context));
-            case 156:
+            case 156 /* GetAccessor */:
                 return ts.updateGetAccessor(node, nodesVisitor(node.decorators, visitor, ts.isDecorator), nodesVisitor(node.modifiers, visitor, ts.isModifier), visitNode(node.name, visitor, ts.isPropertyName), visitParameterList(node.parameters, visitor, context, nodesVisitor), visitNode(node.type, visitor, ts.isTypeNode), visitFunctionBody(node.body, visitor, context));
-            case 157:
+            case 157 /* SetAccessor */:
                 return ts.updateSetAccessor(node, nodesVisitor(node.decorators, visitor, ts.isDecorator), nodesVisitor(node.modifiers, visitor, ts.isModifier), visitNode(node.name, visitor, ts.isPropertyName), visitParameterList(node.parameters, visitor, context, nodesVisitor), visitFunctionBody(node.body, visitor, context));
-            case 158:
+            case 158 /* CallSignature */:
                 return ts.updateCallSignature(node, nodesVisitor(node.typeParameters, visitor, ts.isTypeParameterDeclaration), nodesVisitor(node.parameters, visitor, ts.isParameterDeclaration), visitNode(node.type, visitor, ts.isTypeNode));
-            case 159:
+            case 159 /* ConstructSignature */:
                 return ts.updateConstructSignature(node, nodesVisitor(node.typeParameters, visitor, ts.isTypeParameterDeclaration), nodesVisitor(node.parameters, visitor, ts.isParameterDeclaration), visitNode(node.type, visitor, ts.isTypeNode));
-            case 160:
+            case 160 /* IndexSignature */:
                 return ts.updateIndexSignature(node, nodesVisitor(node.decorators, visitor, ts.isDecorator), nodesVisitor(node.modifiers, visitor, ts.isModifier), nodesVisitor(node.parameters, visitor, ts.isParameterDeclaration), visitNode(node.type, visitor, ts.isTypeNode));
-            case 161:
+            // Types
+            case 161 /* TypePredicate */:
                 return ts.updateTypePredicateNode(node, visitNode(node.parameterName, visitor), visitNode(node.type, visitor, ts.isTypeNode));
-            case 162:
+            case 162 /* TypeReference */:
                 return ts.updateTypeReferenceNode(node, visitNode(node.typeName, visitor, ts.isEntityName), nodesVisitor(node.typeArguments, visitor, ts.isTypeNode));
-            case 163:
+            case 163 /* FunctionType */:
                 return ts.updateFunctionTypeNode(node, nodesVisitor(node.typeParameters, visitor, ts.isTypeParameterDeclaration), nodesVisitor(node.parameters, visitor, ts.isParameterDeclaration), visitNode(node.type, visitor, ts.isTypeNode));
-            case 164:
+            case 164 /* ConstructorType */:
                 return ts.updateConstructorTypeNode(node, nodesVisitor(node.typeParameters, visitor, ts.isTypeParameterDeclaration), nodesVisitor(node.parameters, visitor, ts.isParameterDeclaration), visitNode(node.type, visitor, ts.isTypeNode));
-            case 165:
+            case 165 /* TypeQuery */:
                 return ts.updateTypeQueryNode(node, visitNode(node.exprName, visitor, ts.isEntityName));
-            case 166:
+            case 166 /* TypeLiteral */:
                 return ts.updateTypeLiteralNode(node, nodesVisitor(node.members, visitor, ts.isTypeElement));
-            case 167:
+            case 167 /* ArrayType */:
                 return ts.updateArrayTypeNode(node, visitNode(node.elementType, visitor, ts.isTypeNode));
-            case 168:
+            case 168 /* TupleType */:
                 return ts.updateTypleTypeNode(node, nodesVisitor(node.elementTypes, visitor, ts.isTypeNode));
-            case 169:
+            case 169 /* UnionType */:
                 return ts.updateUnionTypeNode(node, nodesVisitor(node.types, visitor, ts.isTypeNode));
-            case 170:
+            case 170 /* IntersectionType */:
                 return ts.updateIntersectionTypeNode(node, nodesVisitor(node.types, visitor, ts.isTypeNode));
-            case 171:
+            case 171 /* ConditionalType */:
                 return ts.updateConditionalTypeNode(node, visitNode(node.checkType, visitor, ts.isTypeNode), visitNode(node.extendsType, visitor, ts.isTypeNode), visitNode(node.trueType, visitor, ts.isTypeNode), visitNode(node.falseType, visitor, ts.isTypeNode));
-            case 172:
+            case 172 /* InferType */:
                 return ts.updateInferTypeNode(node, visitNode(node.typeParameter, visitor, ts.isTypeParameterDeclaration));
-            case 179:
+            case 179 /* ImportType */:
                 return ts.updateImportTypeNode(node, visitNode(node.argument, visitor, ts.isTypeNode), visitNode(node.qualifier, visitor, ts.isEntityName), visitNodes(node.typeArguments, visitor, ts.isTypeNode), node.isTypeOf);
-            case 173:
+            case 173 /* ParenthesizedType */:
                 return ts.updateParenthesizedType(node, visitNode(node.type, visitor, ts.isTypeNode));
-            case 175:
+            case 175 /* TypeOperator */:
                 return ts.updateTypeOperatorNode(node, visitNode(node.type, visitor, ts.isTypeNode));
-            case 176:
+            case 176 /* IndexedAccessType */:
                 return ts.updateIndexedAccessTypeNode(node, visitNode(node.objectType, visitor, ts.isTypeNode), visitNode(node.indexType, visitor, ts.isTypeNode));
-            case 177:
+            case 177 /* MappedType */:
                 return ts.updateMappedTypeNode(node, visitNode(node.readonlyToken, tokenVisitor, ts.isToken), visitNode(node.typeParameter, visitor, ts.isTypeParameterDeclaration), visitNode(node.questionToken, tokenVisitor, ts.isToken), visitNode(node.type, visitor, ts.isTypeNode));
-            case 178:
+            case 178 /* LiteralType */:
                 return ts.updateLiteralTypeNode(node, visitNode(node.literal, visitor, ts.isExpression));
-            case 180:
+            // Binding patterns
+            case 180 /* ObjectBindingPattern */:
                 return ts.updateObjectBindingPattern(node, nodesVisitor(node.elements, visitor, ts.isBindingElement));
-            case 181:
+            case 181 /* ArrayBindingPattern */:
                 return ts.updateArrayBindingPattern(node, nodesVisitor(node.elements, visitor, ts.isArrayBindingElement));
-            case 182:
+            case 182 /* BindingElement */:
                 return ts.updateBindingElement(node, visitNode(node.dotDotDotToken, tokenVisitor, ts.isToken), visitNode(node.propertyName, visitor, ts.isPropertyName), visitNode(node.name, visitor, ts.isBindingName), visitNode(node.initializer, visitor, ts.isExpression));
-            case 183:
+            // Expression
+            case 183 /* ArrayLiteralExpression */:
                 return ts.updateArrayLiteral(node, nodesVisitor(node.elements, visitor, ts.isExpression));
-            case 184:
+            case 184 /* ObjectLiteralExpression */:
                 return ts.updateObjectLiteral(node, nodesVisitor(node.properties, visitor, ts.isObjectLiteralElementLike));
-            case 185:
+            case 185 /* PropertyAccessExpression */:
                 return ts.updatePropertyAccess(node, visitNode(node.expression, visitor, ts.isExpression), visitNode(node.name, visitor, ts.isIdentifier));
-            case 186:
+            case 186 /* ElementAccessExpression */:
                 return ts.updateElementAccess(node, visitNode(node.expression, visitor, ts.isExpression), visitNode(node.argumentExpression, visitor, ts.isExpression));
-            case 187:
+            case 187 /* CallExpression */:
                 return ts.updateCall(node, visitNode(node.expression, visitor, ts.isExpression), nodesVisitor(node.typeArguments, visitor, ts.isTypeNode), nodesVisitor(node.arguments, visitor, ts.isExpression));
-            case 188:
+            case 188 /* NewExpression */:
                 return ts.updateNew(node, visitNode(node.expression, visitor, ts.isExpression), nodesVisitor(node.typeArguments, visitor, ts.isTypeNode), nodesVisitor(node.arguments, visitor, ts.isExpression));
-            case 189:
+            case 189 /* TaggedTemplateExpression */:
                 return ts.updateTaggedTemplate(node, visitNode(node.tag, visitor, ts.isExpression), visitNodes(node.typeArguments, visitor, ts.isExpression), visitNode(node.template, visitor, ts.isTemplateLiteral));
-            case 190:
+            case 190 /* TypeAssertionExpression */:
                 return ts.updateTypeAssertion(node, visitNode(node.type, visitor, ts.isTypeNode), visitNode(node.expression, visitor, ts.isExpression));
-            case 191:
+            case 191 /* ParenthesizedExpression */:
                 return ts.updateParen(node, visitNode(node.expression, visitor, ts.isExpression));
-            case 192:
+            case 192 /* FunctionExpression */:
                 return ts.updateFunctionExpression(node, nodesVisitor(node.modifiers, visitor, ts.isModifier), visitNode(node.asteriskToken, tokenVisitor, ts.isToken), visitNode(node.name, visitor, ts.isIdentifier), nodesVisitor(node.typeParameters, visitor, ts.isTypeParameterDeclaration), visitParameterList(node.parameters, visitor, context, nodesVisitor), visitNode(node.type, visitor, ts.isTypeNode), visitFunctionBody(node.body, visitor, context));
-            case 193:
+            case 193 /* ArrowFunction */:
                 return ts.updateArrowFunction(node, nodesVisitor(node.modifiers, visitor, ts.isModifier), nodesVisitor(node.typeParameters, visitor, ts.isTypeParameterDeclaration), visitParameterList(node.parameters, visitor, context, nodesVisitor), visitNode(node.type, visitor, ts.isTypeNode), visitNode(node.equalsGreaterThanToken, visitor, ts.isToken), visitFunctionBody(node.body, visitor, context));
-            case 194:
+            case 194 /* DeleteExpression */:
                 return ts.updateDelete(node, visitNode(node.expression, visitor, ts.isExpression));
-            case 195:
+            case 195 /* TypeOfExpression */:
                 return ts.updateTypeOf(node, visitNode(node.expression, visitor, ts.isExpression));
-            case 196:
+            case 196 /* VoidExpression */:
                 return ts.updateVoid(node, visitNode(node.expression, visitor, ts.isExpression));
-            case 197:
+            case 197 /* AwaitExpression */:
                 return ts.updateAwait(node, visitNode(node.expression, visitor, ts.isExpression));
-            case 198:
+            case 198 /* PrefixUnaryExpression */:
                 return ts.updatePrefix(node, visitNode(node.operand, visitor, ts.isExpression));
-            case 199:
+            case 199 /* PostfixUnaryExpression */:
                 return ts.updatePostfix(node, visitNode(node.operand, visitor, ts.isExpression));
-            case 200:
+            case 200 /* BinaryExpression */:
                 return ts.updateBinary(node, visitNode(node.left, visitor, ts.isExpression), visitNode(node.right, visitor, ts.isExpression), visitNode(node.operatorToken, visitor, ts.isToken));
-            case 201:
+            case 201 /* ConditionalExpression */:
                 return ts.updateConditional(node, visitNode(node.condition, visitor, ts.isExpression), visitNode(node.questionToken, visitor, ts.isToken), visitNode(node.whenTrue, visitor, ts.isExpression), visitNode(node.colonToken, visitor, ts.isToken), visitNode(node.whenFalse, visitor, ts.isExpression));
-            case 202:
+            case 202 /* TemplateExpression */:
                 return ts.updateTemplateExpression(node, visitNode(node.head, visitor, ts.isTemplateHead), nodesVisitor(node.templateSpans, visitor, ts.isTemplateSpan));
-            case 203:
+            case 203 /* YieldExpression */:
                 return ts.updateYield(node, visitNode(node.asteriskToken, tokenVisitor, ts.isToken), visitNode(node.expression, visitor, ts.isExpression));
-            case 204:
+            case 204 /* SpreadElement */:
                 return ts.updateSpread(node, visitNode(node.expression, visitor, ts.isExpression));
-            case 205:
+            case 205 /* ClassExpression */:
                 return ts.updateClassExpression(node, nodesVisitor(node.modifiers, visitor, ts.isModifier), visitNode(node.name, visitor, ts.isIdentifier), nodesVisitor(node.typeParameters, visitor, ts.isTypeParameterDeclaration), nodesVisitor(node.heritageClauses, visitor, ts.isHeritageClause), nodesVisitor(node.members, visitor, ts.isClassElement));
-            case 207:
+            case 207 /* ExpressionWithTypeArguments */:
                 return ts.updateExpressionWithTypeArguments(node, nodesVisitor(node.typeArguments, visitor, ts.isTypeNode), visitNode(node.expression, visitor, ts.isExpression));
-            case 208:
+            case 208 /* AsExpression */:
                 return ts.updateAsExpression(node, visitNode(node.expression, visitor, ts.isExpression), visitNode(node.type, visitor, ts.isTypeNode));
-            case 209:
+            case 209 /* NonNullExpression */:
                 return ts.updateNonNullExpression(node, visitNode(node.expression, visitor, ts.isExpression));
-            case 210:
+            case 210 /* MetaProperty */:
                 return ts.updateMetaProperty(node, visitNode(node.name, visitor, ts.isIdentifier));
-            case 211:
+            // Misc
+            case 211 /* TemplateSpan */:
                 return ts.updateTemplateSpan(node, visitNode(node.expression, visitor, ts.isExpression), visitNode(node.literal, visitor, ts.isTemplateMiddleOrTemplateTail));
-            case 213:
+            // Element
+            case 213 /* Block */:
                 return ts.updateBlock(node, nodesVisitor(node.statements, visitor, ts.isStatement));
-            case 214:
+            case 214 /* VariableStatement */:
                 return ts.updateVariableStatement(node, nodesVisitor(node.modifiers, visitor, ts.isModifier), visitNode(node.declarationList, visitor, ts.isVariableDeclarationList));
-            case 216:
+            case 216 /* ExpressionStatement */:
                 return ts.updateStatement(node, visitNode(node.expression, visitor, ts.isExpression));
-            case 217:
+            case 217 /* IfStatement */:
                 return ts.updateIf(node, visitNode(node.expression, visitor, ts.isExpression), visitNode(node.thenStatement, visitor, ts.isStatement, ts.liftToBlock), visitNode(node.elseStatement, visitor, ts.isStatement, ts.liftToBlock));
-            case 218:
+            case 218 /* DoStatement */:
                 return ts.updateDo(node, visitNode(node.statement, visitor, ts.isStatement, ts.liftToBlock), visitNode(node.expression, visitor, ts.isExpression));
-            case 219:
+            case 219 /* WhileStatement */:
                 return ts.updateWhile(node, visitNode(node.expression, visitor, ts.isExpression), visitNode(node.statement, visitor, ts.isStatement, ts.liftToBlock));
-            case 220:
+            case 220 /* ForStatement */:
                 return ts.updateFor(node, visitNode(node.initializer, visitor, ts.isForInitializer), visitNode(node.condition, visitor, ts.isExpression), visitNode(node.incrementor, visitor, ts.isExpression), visitNode(node.statement, visitor, ts.isStatement, ts.liftToBlock));
-            case 221:
+            case 221 /* ForInStatement */:
                 return ts.updateForIn(node, visitNode(node.initializer, visitor, ts.isForInitializer), visitNode(node.expression, visitor, ts.isExpression), visitNode(node.statement, visitor, ts.isStatement, ts.liftToBlock));
-            case 222:
+            case 222 /* ForOfStatement */:
                 return ts.updateForOf(node, visitNode(node.awaitModifier, visitor, ts.isToken), visitNode(node.initializer, visitor, ts.isForInitializer), visitNode(node.expression, visitor, ts.isExpression), visitNode(node.statement, visitor, ts.isStatement, ts.liftToBlock));
-            case 223:
+            case 223 /* ContinueStatement */:
                 return ts.updateContinue(node, visitNode(node.label, visitor, ts.isIdentifier));
-            case 224:
+            case 224 /* BreakStatement */:
                 return ts.updateBreak(node, visitNode(node.label, visitor, ts.isIdentifier));
-            case 225:
+            case 225 /* ReturnStatement */:
                 return ts.updateReturn(node, visitNode(node.expression, visitor, ts.isExpression));
-            case 226:
+            case 226 /* WithStatement */:
                 return ts.updateWith(node, visitNode(node.expression, visitor, ts.isExpression), visitNode(node.statement, visitor, ts.isStatement, ts.liftToBlock));
-            case 227:
+            case 227 /* SwitchStatement */:
                 return ts.updateSwitch(node, visitNode(node.expression, visitor, ts.isExpression), visitNode(node.caseBlock, visitor, ts.isCaseBlock));
-            case 228:
+            case 228 /* LabeledStatement */:
                 return ts.updateLabel(node, visitNode(node.label, visitor, ts.isIdentifier), visitNode(node.statement, visitor, ts.isStatement, ts.liftToBlock));
-            case 229:
+            case 229 /* ThrowStatement */:
                 return ts.updateThrow(node, visitNode(node.expression, visitor, ts.isExpression));
-            case 230:
+            case 230 /* TryStatement */:
                 return ts.updateTry(node, visitNode(node.tryBlock, visitor, ts.isBlock), visitNode(node.catchClause, visitor, ts.isCatchClause), visitNode(node.finallyBlock, visitor, ts.isBlock));
-            case 232:
+            case 232 /* VariableDeclaration */:
                 return ts.updateVariableDeclaration(node, visitNode(node.name, visitor, ts.isBindingName), visitNode(node.type, visitor, ts.isTypeNode), visitNode(node.initializer, visitor, ts.isExpression));
-            case 233:
+            case 233 /* VariableDeclarationList */:
                 return ts.updateVariableDeclarationList(node, nodesVisitor(node.declarations, visitor, ts.isVariableDeclaration));
-            case 234:
+            case 234 /* FunctionDeclaration */:
                 return ts.updateFunctionDeclaration(node, nodesVisitor(node.decorators, visitor, ts.isDecorator), nodesVisitor(node.modifiers, visitor, ts.isModifier), visitNode(node.asteriskToken, tokenVisitor, ts.isToken), visitNode(node.name, visitor, ts.isIdentifier), nodesVisitor(node.typeParameters, visitor, ts.isTypeParameterDeclaration), visitParameterList(node.parameters, visitor, context, nodesVisitor), visitNode(node.type, visitor, ts.isTypeNode), visitFunctionBody(node.body, visitor, context));
-            case 235:
+            case 235 /* ClassDeclaration */:
                 return ts.updateClassDeclaration(node, nodesVisitor(node.decorators, visitor, ts.isDecorator), nodesVisitor(node.modifiers, visitor, ts.isModifier), visitNode(node.name, visitor, ts.isIdentifier), nodesVisitor(node.typeParameters, visitor, ts.isTypeParameterDeclaration), nodesVisitor(node.heritageClauses, visitor, ts.isHeritageClause), nodesVisitor(node.members, visitor, ts.isClassElement));
-            case 236:
+            case 236 /* InterfaceDeclaration */:
                 return ts.updateInterfaceDeclaration(node, nodesVisitor(node.decorators, visitor, ts.isDecorator), nodesVisitor(node.modifiers, visitor, ts.isModifier), visitNode(node.name, visitor, ts.isIdentifier), nodesVisitor(node.typeParameters, visitor, ts.isTypeParameterDeclaration), nodesVisitor(node.heritageClauses, visitor, ts.isHeritageClause), nodesVisitor(node.members, visitor, ts.isTypeElement));
-            case 237:
+            case 237 /* TypeAliasDeclaration */:
                 return ts.updateTypeAliasDeclaration(node, nodesVisitor(node.decorators, visitor, ts.isDecorator), nodesVisitor(node.modifiers, visitor, ts.isModifier), visitNode(node.name, visitor, ts.isIdentifier), nodesVisitor(node.typeParameters, visitor, ts.isTypeParameterDeclaration), visitNode(node.type, visitor, ts.isTypeNode));
-            case 238:
+            case 238 /* EnumDeclaration */:
                 return ts.updateEnumDeclaration(node, nodesVisitor(node.decorators, visitor, ts.isDecorator), nodesVisitor(node.modifiers, visitor, ts.isModifier), visitNode(node.name, visitor, ts.isIdentifier), nodesVisitor(node.members, visitor, ts.isEnumMember));
-            case 239:
+            case 239 /* ModuleDeclaration */:
                 return ts.updateModuleDeclaration(node, nodesVisitor(node.decorators, visitor, ts.isDecorator), nodesVisitor(node.modifiers, visitor, ts.isModifier), visitNode(node.name, visitor, ts.isIdentifier), visitNode(node.body, visitor, ts.isModuleBody));
-            case 240:
+            case 240 /* ModuleBlock */:
                 return ts.updateModuleBlock(node, nodesVisitor(node.statements, visitor, ts.isStatement));
-            case 241:
+            case 241 /* CaseBlock */:
                 return ts.updateCaseBlock(node, nodesVisitor(node.clauses, visitor, ts.isCaseOrDefaultClause));
-            case 242:
+            case 242 /* NamespaceExportDeclaration */:
                 return ts.updateNamespaceExportDeclaration(node, visitNode(node.name, visitor, ts.isIdentifier));
-            case 243:
+            case 243 /* ImportEqualsDeclaration */:
                 return ts.updateImportEqualsDeclaration(node, nodesVisitor(node.decorators, visitor, ts.isDecorator), nodesVisitor(node.modifiers, visitor, ts.isModifier), visitNode(node.name, visitor, ts.isIdentifier), visitNode(node.moduleReference, visitor, ts.isModuleReference));
-            case 244:
+            case 244 /* ImportDeclaration */:
                 return ts.updateImportDeclaration(node, nodesVisitor(node.decorators, visitor, ts.isDecorator), nodesVisitor(node.modifiers, visitor, ts.isModifier), visitNode(node.importClause, visitor, ts.isImportClause), visitNode(node.moduleSpecifier, visitor, ts.isExpression));
-            case 245:
+            case 245 /* ImportClause */:
                 return ts.updateImportClause(node, visitNode(node.name, visitor, ts.isIdentifier), visitNode(node.namedBindings, visitor, ts.isNamedImportBindings));
-            case 246:
+            case 246 /* NamespaceImport */:
                 return ts.updateNamespaceImport(node, visitNode(node.name, visitor, ts.isIdentifier));
-            case 247:
+            case 247 /* NamedImports */:
                 return ts.updateNamedImports(node, nodesVisitor(node.elements, visitor, ts.isImportSpecifier));
-            case 248:
+            case 248 /* ImportSpecifier */:
                 return ts.updateImportSpecifier(node, visitNode(node.propertyName, visitor, ts.isIdentifier), visitNode(node.name, visitor, ts.isIdentifier));
-            case 249:
+            case 249 /* ExportAssignment */:
                 return ts.updateExportAssignment(node, nodesVisitor(node.decorators, visitor, ts.isDecorator), nodesVisitor(node.modifiers, visitor, ts.isModifier), visitNode(node.expression, visitor, ts.isExpression));
-            case 250:
+            case 250 /* ExportDeclaration */:
                 return ts.updateExportDeclaration(node, nodesVisitor(node.decorators, visitor, ts.isDecorator), nodesVisitor(node.modifiers, visitor, ts.isModifier), visitNode(node.exportClause, visitor, ts.isNamedExports), visitNode(node.moduleSpecifier, visitor, ts.isExpression));
-            case 251:
+            case 251 /* NamedExports */:
                 return ts.updateNamedExports(node, nodesVisitor(node.elements, visitor, ts.isExportSpecifier));
-            case 252:
+            case 252 /* ExportSpecifier */:
                 return ts.updateExportSpecifier(node, visitNode(node.propertyName, visitor, ts.isIdentifier), visitNode(node.name, visitor, ts.isIdentifier));
-            case 254:
+            // Module references
+            case 254 /* ExternalModuleReference */:
                 return ts.updateExternalModuleReference(node, visitNode(node.expression, visitor, ts.isExpression));
-            case 255:
+            // JSX
+            case 255 /* JsxElement */:
                 return ts.updateJsxElement(node, visitNode(node.openingElement, visitor, ts.isJsxOpeningElement), nodesVisitor(node.children, visitor, ts.isJsxChild), visitNode(node.closingElement, visitor, ts.isJsxClosingElement));
-            case 256:
+            case 256 /* JsxSelfClosingElement */:
                 return ts.updateJsxSelfClosingElement(node, visitNode(node.tagName, visitor, ts.isJsxTagNameExpression), nodesVisitor(node.typeArguments, visitor, ts.isTypeNode), visitNode(node.attributes, visitor, ts.isJsxAttributes));
-            case 257:
+            case 257 /* JsxOpeningElement */:
                 return ts.updateJsxOpeningElement(node, visitNode(node.tagName, visitor, ts.isJsxTagNameExpression), nodesVisitor(node.typeArguments, visitor, ts.isTypeNode), visitNode(node.attributes, visitor, ts.isJsxAttributes));
-            case 258:
+            case 258 /* JsxClosingElement */:
                 return ts.updateJsxClosingElement(node, visitNode(node.tagName, visitor, ts.isJsxTagNameExpression));
-            case 259:
+            case 259 /* JsxFragment */:
                 return ts.updateJsxFragment(node, visitNode(node.openingFragment, visitor, ts.isJsxOpeningFragment), nodesVisitor(node.children, visitor, ts.isJsxChild), visitNode(node.closingFragment, visitor, ts.isJsxClosingFragment));
-            case 262:
+            case 262 /* JsxAttribute */:
                 return ts.updateJsxAttribute(node, visitNode(node.name, visitor, ts.isIdentifier), visitNode(node.initializer, visitor, ts.isStringLiteralOrJsxExpression));
-            case 263:
+            case 263 /* JsxAttributes */:
                 return ts.updateJsxAttributes(node, nodesVisitor(node.properties, visitor, ts.isJsxAttributeLike));
-            case 264:
+            case 264 /* JsxSpreadAttribute */:
                 return ts.updateJsxSpreadAttribute(node, visitNode(node.expression, visitor, ts.isExpression));
-            case 265:
+            case 265 /* JsxExpression */:
                 return ts.updateJsxExpression(node, visitNode(node.expression, visitor, ts.isExpression));
-            case 266:
+            // Clauses
+            case 266 /* CaseClause */:
                 return ts.updateCaseClause(node, visitNode(node.expression, visitor, ts.isExpression), nodesVisitor(node.statements, visitor, ts.isStatement));
-            case 267:
+            case 267 /* DefaultClause */:
                 return ts.updateDefaultClause(node, nodesVisitor(node.statements, visitor, ts.isStatement));
-            case 268:
+            case 268 /* HeritageClause */:
                 return ts.updateHeritageClause(node, nodesVisitor(node.types, visitor, ts.isExpressionWithTypeArguments));
-            case 269:
+            case 269 /* CatchClause */:
                 return ts.updateCatchClause(node, visitNode(node.variableDeclaration, visitor, ts.isVariableDeclaration), visitNode(node.block, visitor, ts.isBlock));
-            case 270:
+            // Property assignments
+            case 270 /* PropertyAssignment */:
                 return ts.updatePropertyAssignment(node, visitNode(node.name, visitor, ts.isPropertyName), visitNode(node.initializer, visitor, ts.isExpression));
-            case 271:
+            case 271 /* ShorthandPropertyAssignment */:
                 return ts.updateShorthandPropertyAssignment(node, visitNode(node.name, visitor, ts.isIdentifier), visitNode(node.objectAssignmentInitializer, visitor, ts.isExpression));
-            case 272:
+            case 272 /* SpreadAssignment */:
                 return ts.updateSpreadAssignment(node, visitNode(node.expression, visitor, ts.isExpression));
-            case 273:
+            // Enum
+            case 273 /* EnumMember */:
                 return ts.updateEnumMember(node, visitNode(node.name, visitor, ts.isPropertyName), visitNode(node.initializer, visitor, ts.isExpression));
-            case 274:
+            // Top-level nodes
+            case 274 /* SourceFile */:
                 return ts.updateSourceFileNode(node, visitLexicalEnvironment(node.statements, visitor, context));
-            case 301:
+            // Transformation nodes
+            case 301 /* PartiallyEmittedExpression */:
                 return ts.updatePartiallyEmittedExpression(node, visitNode(node.expression, visitor, ts.isExpression));
-            case 302:
+            case 302 /* CommaListExpression */:
                 return ts.updateCommaList(node, nodesVisitor(node.elements, visitor, ts.isExpression));
             default:
+                // No need to visit nodes with no children.
                 return node;
         }
     }
     ts.visitEachChild = visitEachChild;
+    /**
+     * Extracts the single node from a NodeArray.
+     *
+     * @param nodes The NodeArray.
+     */
     function extractSingleNode(nodes) {
         ts.Debug.assert(nodes.length <= 1, "Too many nodes written to output.");
         return ts.singleOrUndefined(nodes);
     }
 })(ts || (ts = {}));
+/* @internal */
 (function (ts) {
     function reduceNode(node, f, initial) {
         return node ? f(initial, node) : initial;
@@ -47875,6 +59757,14 @@ var ts;
     function reduceNodeArray(nodes, f, initial) {
         return nodes ? f(initial, nodes) : initial;
     }
+    /**
+     * Similar to `reduceLeft`, performs a reduction against each child of a node.
+     * NOTE: Unlike `forEachChild`, this does *not* visit every node.
+     *
+     * @param node The node containing the children to reduce.
+     * @param initial The initial value to supply to the reduction.
+     * @param f The callback function
+     */
     function reduceEachChild(node, initial, cbNode, cbNodeArray) {
         if (node === undefined) {
             return initial;
@@ -47882,52 +59772,59 @@ var ts;
         var reduceNodes = cbNodeArray ? reduceNodeArray : ts.reduceLeft;
         var cbNodes = cbNodeArray || cbNode;
         var kind = node.kind;
-        if ((kind > 0 && kind <= 145)) {
+        // No need to visit nodes with no children.
+        if ((kind > 0 /* FirstToken */ && kind <= 145 /* LastToken */)) {
             return initial;
         }
-        if ((kind >= 161 && kind <= 178)) {
+        // We do not yet support types.
+        if ((kind >= 161 /* TypePredicate */ && kind <= 178 /* LiteralType */)) {
             return initial;
         }
         var result = initial;
         switch (node.kind) {
-            case 212:
-            case 215:
-            case 206:
-            case 231:
-            case 300:
+            // Leaf nodes
+            case 212 /* SemicolonClassElement */:
+            case 215 /* EmptyStatement */:
+            case 206 /* OmittedExpression */:
+            case 231 /* DebuggerStatement */:
+            case 300 /* NotEmittedStatement */:
+                // No need to visit nodes with no children.
                 break;
-            case 146:
+            // Names
+            case 146 /* QualifiedName */:
                 result = reduceNode(node.left, cbNode, result);
                 result = reduceNode(node.right, cbNode, result);
                 break;
-            case 147:
+            case 147 /* ComputedPropertyName */:
                 result = reduceNode(node.expression, cbNode, result);
                 break;
-            case 149:
+            // Signature elements
+            case 149 /* Parameter */:
                 result = reduceNodes(node.decorators, cbNodes, result);
                 result = reduceNodes(node.modifiers, cbNodes, result);
                 result = reduceNode(node.name, cbNode, result);
                 result = reduceNode(node.type, cbNode, result);
                 result = reduceNode(node.initializer, cbNode, result);
                 break;
-            case 150:
+            case 150 /* Decorator */:
                 result = reduceNode(node.expression, cbNode, result);
                 break;
-            case 151:
+            // Type member
+            case 151 /* PropertySignature */:
                 result = reduceNodes(node.modifiers, cbNodes, result);
                 result = reduceNode(node.name, cbNode, result);
                 result = reduceNode(node.questionToken, cbNode, result);
                 result = reduceNode(node.type, cbNode, result);
                 result = reduceNode(node.initializer, cbNode, result);
                 break;
-            case 152:
+            case 152 /* PropertyDeclaration */:
                 result = reduceNodes(node.decorators, cbNodes, result);
                 result = reduceNodes(node.modifiers, cbNodes, result);
                 result = reduceNode(node.name, cbNode, result);
                 result = reduceNode(node.type, cbNode, result);
                 result = reduceNode(node.initializer, cbNode, result);
                 break;
-            case 154:
+            case 154 /* MethodDeclaration */:
                 result = reduceNodes(node.decorators, cbNodes, result);
                 result = reduceNodes(node.modifiers, cbNodes, result);
                 result = reduceNode(node.name, cbNode, result);
@@ -47936,12 +59833,12 @@ var ts;
                 result = reduceNode(node.type, cbNode, result);
                 result = reduceNode(node.body, cbNode, result);
                 break;
-            case 155:
+            case 155 /* Constructor */:
                 result = reduceNodes(node.modifiers, cbNodes, result);
                 result = reduceNodes(node.parameters, cbNodes, result);
                 result = reduceNode(node.body, cbNode, result);
                 break;
-            case 156:
+            case 156 /* GetAccessor */:
                 result = reduceNodes(node.decorators, cbNodes, result);
                 result = reduceNodes(node.modifiers, cbNodes, result);
                 result = reduceNode(node.name, cbNode, result);
@@ -47949,55 +59846,57 @@ var ts;
                 result = reduceNode(node.type, cbNode, result);
                 result = reduceNode(node.body, cbNode, result);
                 break;
-            case 157:
+            case 157 /* SetAccessor */:
                 result = reduceNodes(node.decorators, cbNodes, result);
                 result = reduceNodes(node.modifiers, cbNodes, result);
                 result = reduceNode(node.name, cbNode, result);
                 result = reduceNodes(node.parameters, cbNodes, result);
                 result = reduceNode(node.body, cbNode, result);
                 break;
-            case 180:
-            case 181:
+            // Binding patterns
+            case 180 /* ObjectBindingPattern */:
+            case 181 /* ArrayBindingPattern */:
                 result = reduceNodes(node.elements, cbNodes, result);
                 break;
-            case 182:
+            case 182 /* BindingElement */:
                 result = reduceNode(node.propertyName, cbNode, result);
                 result = reduceNode(node.name, cbNode, result);
                 result = reduceNode(node.initializer, cbNode, result);
                 break;
-            case 183:
+            // Expression
+            case 183 /* ArrayLiteralExpression */:
                 result = reduceNodes(node.elements, cbNodes, result);
                 break;
-            case 184:
+            case 184 /* ObjectLiteralExpression */:
                 result = reduceNodes(node.properties, cbNodes, result);
                 break;
-            case 185:
+            case 185 /* PropertyAccessExpression */:
                 result = reduceNode(node.expression, cbNode, result);
                 result = reduceNode(node.name, cbNode, result);
                 break;
-            case 186:
+            case 186 /* ElementAccessExpression */:
                 result = reduceNode(node.expression, cbNode, result);
                 result = reduceNode(node.argumentExpression, cbNode, result);
                 break;
-            case 187:
+            case 187 /* CallExpression */:
                 result = reduceNode(node.expression, cbNode, result);
                 result = reduceNodes(node.typeArguments, cbNodes, result);
                 result = reduceNodes(node.arguments, cbNodes, result);
                 break;
-            case 188:
+            case 188 /* NewExpression */:
                 result = reduceNode(node.expression, cbNode, result);
                 result = reduceNodes(node.typeArguments, cbNodes, result);
                 result = reduceNodes(node.arguments, cbNodes, result);
                 break;
-            case 189:
+            case 189 /* TaggedTemplateExpression */:
                 result = reduceNode(node.tag, cbNode, result);
                 result = reduceNode(node.template, cbNode, result);
                 break;
-            case 190:
+            case 190 /* TypeAssertionExpression */:
                 result = reduceNode(node.type, cbNode, result);
                 result = reduceNode(node.expression, cbNode, result);
                 break;
-            case 192:
+            case 192 /* FunctionExpression */:
                 result = reduceNodes(node.modifiers, cbNodes, result);
                 result = reduceNode(node.name, cbNode, result);
                 result = reduceNodes(node.typeParameters, cbNodes, result);
@@ -48005,121 +59904,123 @@ var ts;
                 result = reduceNode(node.type, cbNode, result);
                 result = reduceNode(node.body, cbNode, result);
                 break;
-            case 193:
+            case 193 /* ArrowFunction */:
                 result = reduceNodes(node.modifiers, cbNodes, result);
                 result = reduceNodes(node.typeParameters, cbNodes, result);
                 result = reduceNodes(node.parameters, cbNodes, result);
                 result = reduceNode(node.type, cbNode, result);
                 result = reduceNode(node.body, cbNode, result);
                 break;
-            case 191:
-            case 194:
-            case 195:
-            case 196:
-            case 197:
-            case 203:
-            case 204:
-            case 209:
+            case 191 /* ParenthesizedExpression */:
+            case 194 /* DeleteExpression */:
+            case 195 /* TypeOfExpression */:
+            case 196 /* VoidExpression */:
+            case 197 /* AwaitExpression */:
+            case 203 /* YieldExpression */:
+            case 204 /* SpreadElement */:
+            case 209 /* NonNullExpression */:
                 result = reduceNode(node.expression, cbNode, result);
                 break;
-            case 198:
-            case 199:
+            case 198 /* PrefixUnaryExpression */:
+            case 199 /* PostfixUnaryExpression */:
                 result = reduceNode(node.operand, cbNode, result);
                 break;
-            case 200:
+            case 200 /* BinaryExpression */:
                 result = reduceNode(node.left, cbNode, result);
                 result = reduceNode(node.right, cbNode, result);
                 break;
-            case 201:
+            case 201 /* ConditionalExpression */:
                 result = reduceNode(node.condition, cbNode, result);
                 result = reduceNode(node.whenTrue, cbNode, result);
                 result = reduceNode(node.whenFalse, cbNode, result);
                 break;
-            case 202:
+            case 202 /* TemplateExpression */:
                 result = reduceNode(node.head, cbNode, result);
                 result = reduceNodes(node.templateSpans, cbNodes, result);
                 break;
-            case 205:
+            case 205 /* ClassExpression */:
                 result = reduceNodes(node.modifiers, cbNodes, result);
                 result = reduceNode(node.name, cbNode, result);
                 result = reduceNodes(node.typeParameters, cbNodes, result);
                 result = reduceNodes(node.heritageClauses, cbNodes, result);
                 result = reduceNodes(node.members, cbNodes, result);
                 break;
-            case 207:
+            case 207 /* ExpressionWithTypeArguments */:
                 result = reduceNode(node.expression, cbNode, result);
                 result = reduceNodes(node.typeArguments, cbNodes, result);
                 break;
-            case 208:
+            case 208 /* AsExpression */:
                 result = reduceNode(node.expression, cbNode, result);
                 result = reduceNode(node.type, cbNode, result);
                 break;
-            case 211:
+            // Misc
+            case 211 /* TemplateSpan */:
                 result = reduceNode(node.expression, cbNode, result);
                 result = reduceNode(node.literal, cbNode, result);
                 break;
-            case 213:
+            // Element
+            case 213 /* Block */:
                 result = reduceNodes(node.statements, cbNodes, result);
                 break;
-            case 214:
+            case 214 /* VariableStatement */:
                 result = reduceNodes(node.modifiers, cbNodes, result);
                 result = reduceNode(node.declarationList, cbNode, result);
                 break;
-            case 216:
+            case 216 /* ExpressionStatement */:
                 result = reduceNode(node.expression, cbNode, result);
                 break;
-            case 217:
+            case 217 /* IfStatement */:
                 result = reduceNode(node.expression, cbNode, result);
                 result = reduceNode(node.thenStatement, cbNode, result);
                 result = reduceNode(node.elseStatement, cbNode, result);
                 break;
-            case 218:
+            case 218 /* DoStatement */:
                 result = reduceNode(node.statement, cbNode, result);
                 result = reduceNode(node.expression, cbNode, result);
                 break;
-            case 219:
-            case 226:
+            case 219 /* WhileStatement */:
+            case 226 /* WithStatement */:
                 result = reduceNode(node.expression, cbNode, result);
                 result = reduceNode(node.statement, cbNode, result);
                 break;
-            case 220:
+            case 220 /* ForStatement */:
                 result = reduceNode(node.initializer, cbNode, result);
                 result = reduceNode(node.condition, cbNode, result);
                 result = reduceNode(node.incrementor, cbNode, result);
                 result = reduceNode(node.statement, cbNode, result);
                 break;
-            case 221:
-            case 222:
+            case 221 /* ForInStatement */:
+            case 222 /* ForOfStatement */:
                 result = reduceNode(node.initializer, cbNode, result);
                 result = reduceNode(node.expression, cbNode, result);
                 result = reduceNode(node.statement, cbNode, result);
                 break;
-            case 225:
-            case 229:
+            case 225 /* ReturnStatement */:
+            case 229 /* ThrowStatement */:
                 result = reduceNode(node.expression, cbNode, result);
                 break;
-            case 227:
+            case 227 /* SwitchStatement */:
                 result = reduceNode(node.expression, cbNode, result);
                 result = reduceNode(node.caseBlock, cbNode, result);
                 break;
-            case 228:
+            case 228 /* LabeledStatement */:
                 result = reduceNode(node.label, cbNode, result);
                 result = reduceNode(node.statement, cbNode, result);
                 break;
-            case 230:
+            case 230 /* TryStatement */:
                 result = reduceNode(node.tryBlock, cbNode, result);
                 result = reduceNode(node.catchClause, cbNode, result);
                 result = reduceNode(node.finallyBlock, cbNode, result);
                 break;
-            case 232:
+            case 232 /* VariableDeclaration */:
                 result = reduceNode(node.name, cbNode, result);
                 result = reduceNode(node.type, cbNode, result);
                 result = reduceNode(node.initializer, cbNode, result);
                 break;
-            case 233:
+            case 233 /* VariableDeclarationList */:
                 result = reduceNodes(node.declarations, cbNodes, result);
                 break;
-            case 234:
+            case 234 /* FunctionDeclaration */:
                 result = reduceNodes(node.decorators, cbNodes, result);
                 result = reduceNodes(node.modifiers, cbNodes, result);
                 result = reduceNode(node.name, cbNode, result);
@@ -48128,7 +60029,7 @@ var ts;
                 result = reduceNode(node.type, cbNode, result);
                 result = reduceNode(node.body, cbNode, result);
                 break;
-            case 235:
+            case 235 /* ClassDeclaration */:
                 result = reduceNodes(node.decorators, cbNodes, result);
                 result = reduceNodes(node.modifiers, cbNodes, result);
                 result = reduceNode(node.name, cbNode, result);
@@ -48136,131 +60037,139 @@ var ts;
                 result = reduceNodes(node.heritageClauses, cbNodes, result);
                 result = reduceNodes(node.members, cbNodes, result);
                 break;
-            case 238:
+            case 238 /* EnumDeclaration */:
                 result = reduceNodes(node.decorators, cbNodes, result);
                 result = reduceNodes(node.modifiers, cbNodes, result);
                 result = reduceNode(node.name, cbNode, result);
                 result = reduceNodes(node.members, cbNodes, result);
                 break;
-            case 239:
+            case 239 /* ModuleDeclaration */:
                 result = reduceNodes(node.decorators, cbNodes, result);
                 result = reduceNodes(node.modifiers, cbNodes, result);
                 result = reduceNode(node.name, cbNode, result);
                 result = reduceNode(node.body, cbNode, result);
                 break;
-            case 240:
+            case 240 /* ModuleBlock */:
                 result = reduceNodes(node.statements, cbNodes, result);
                 break;
-            case 241:
+            case 241 /* CaseBlock */:
                 result = reduceNodes(node.clauses, cbNodes, result);
                 break;
-            case 243:
+            case 243 /* ImportEqualsDeclaration */:
                 result = reduceNodes(node.decorators, cbNodes, result);
                 result = reduceNodes(node.modifiers, cbNodes, result);
                 result = reduceNode(node.name, cbNode, result);
                 result = reduceNode(node.moduleReference, cbNode, result);
                 break;
-            case 244:
+            case 244 /* ImportDeclaration */:
                 result = reduceNodes(node.decorators, cbNodes, result);
                 result = reduceNodes(node.modifiers, cbNodes, result);
                 result = reduceNode(node.importClause, cbNode, result);
                 result = reduceNode(node.moduleSpecifier, cbNode, result);
                 break;
-            case 245:
+            case 245 /* ImportClause */:
                 result = reduceNode(node.name, cbNode, result);
                 result = reduceNode(node.namedBindings, cbNode, result);
                 break;
-            case 246:
+            case 246 /* NamespaceImport */:
                 result = reduceNode(node.name, cbNode, result);
                 break;
-            case 247:
-            case 251:
+            case 247 /* NamedImports */:
+            case 251 /* NamedExports */:
                 result = reduceNodes(node.elements, cbNodes, result);
                 break;
-            case 248:
-            case 252:
+            case 248 /* ImportSpecifier */:
+            case 252 /* ExportSpecifier */:
                 result = reduceNode(node.propertyName, cbNode, result);
                 result = reduceNode(node.name, cbNode, result);
                 break;
-            case 249:
+            case 249 /* ExportAssignment */:
                 result = ts.reduceLeft(node.decorators, cbNode, result);
                 result = ts.reduceLeft(node.modifiers, cbNode, result);
                 result = reduceNode(node.expression, cbNode, result);
                 break;
-            case 250:
+            case 250 /* ExportDeclaration */:
                 result = ts.reduceLeft(node.decorators, cbNode, result);
                 result = ts.reduceLeft(node.modifiers, cbNode, result);
                 result = reduceNode(node.exportClause, cbNode, result);
                 result = reduceNode(node.moduleSpecifier, cbNode, result);
                 break;
-            case 254:
+            // Module references
+            case 254 /* ExternalModuleReference */:
                 result = reduceNode(node.expression, cbNode, result);
                 break;
-            case 255:
+            // JSX
+            case 255 /* JsxElement */:
                 result = reduceNode(node.openingElement, cbNode, result);
                 result = ts.reduceLeft(node.children, cbNode, result);
                 result = reduceNode(node.closingElement, cbNode, result);
                 break;
-            case 259:
+            case 259 /* JsxFragment */:
                 result = reduceNode(node.openingFragment, cbNode, result);
                 result = ts.reduceLeft(node.children, cbNode, result);
                 result = reduceNode(node.closingFragment, cbNode, result);
                 break;
-            case 256:
-            case 257:
+            case 256 /* JsxSelfClosingElement */:
+            case 257 /* JsxOpeningElement */:
                 result = reduceNode(node.tagName, cbNode, result);
                 result = reduceNode(node.attributes, cbNode, result);
                 break;
-            case 263:
+            case 263 /* JsxAttributes */:
                 result = reduceNodes(node.properties, cbNodes, result);
                 break;
-            case 258:
+            case 258 /* JsxClosingElement */:
                 result = reduceNode(node.tagName, cbNode, result);
                 break;
-            case 262:
+            case 262 /* JsxAttribute */:
                 result = reduceNode(node.name, cbNode, result);
                 result = reduceNode(node.initializer, cbNode, result);
                 break;
-            case 264:
+            case 264 /* JsxSpreadAttribute */:
                 result = reduceNode(node.expression, cbNode, result);
                 break;
-            case 265:
+            case 265 /* JsxExpression */:
                 result = reduceNode(node.expression, cbNode, result);
                 break;
-            case 266:
+            // Clauses
+            case 266 /* CaseClause */:
                 result = reduceNode(node.expression, cbNode, result);
-            case 267:
+            // falls through
+            case 267 /* DefaultClause */:
                 result = reduceNodes(node.statements, cbNodes, result);
                 break;
-            case 268:
+            case 268 /* HeritageClause */:
                 result = reduceNodes(node.types, cbNodes, result);
                 break;
-            case 269:
+            case 269 /* CatchClause */:
                 result = reduceNode(node.variableDeclaration, cbNode, result);
                 result = reduceNode(node.block, cbNode, result);
                 break;
-            case 270:
+            // Property assignments
+            case 270 /* PropertyAssignment */:
                 result = reduceNode(node.name, cbNode, result);
                 result = reduceNode(node.initializer, cbNode, result);
                 break;
-            case 271:
+            case 271 /* ShorthandPropertyAssignment */:
                 result = reduceNode(node.name, cbNode, result);
                 result = reduceNode(node.objectAssignmentInitializer, cbNode, result);
                 break;
-            case 272:
+            case 272 /* SpreadAssignment */:
                 result = reduceNode(node.expression, cbNode, result);
                 break;
-            case 273:
+            // Enum
+            case 273 /* EnumMember */:
                 result = reduceNode(node.name, cbNode, result);
                 result = reduceNode(node.initializer, cbNode, result);
                 break;
-            case 274:
+            // Top-level nodes
+            case 274 /* SourceFile */:
                 result = reduceNodes(node.statements, cbNodes, result);
                 break;
-            case 301:
+            // Transformation nodes
+            case 301 /* PartiallyEmittedExpression */:
                 result = reduceNode(node.expression, cbNode, result);
                 break;
-            case 302:
+            case 302 /* CommaListExpression */:
                 result = reduceNodes(node.elements, cbNodes, result);
                 break;
             default:
@@ -48278,21 +60187,36 @@ var ts;
             : ts.prependStatements(statements, declarations);
     }
     ts.mergeLexicalEnvironment = mergeLexicalEnvironment;
+    /**
+     * Lifts a NodeArray containing only Statement nodes to a block.
+     *
+     * @param nodes The NodeArray.
+     */
     function liftToBlock(nodes) {
         Debug.assert(ts.every(nodes, ts.isStatement), "Cannot lift nodes to a Block.");
         return ts.singleOrUndefined(nodes) || ts.createBlock(nodes);
     }
     ts.liftToBlock = liftToBlock;
+    /**
+     * Aggregates the TransformFlags for a Node and its subtree.
+     */
     function aggregateTransformFlags(node) {
         aggregateTransformFlagsForNode(node);
         return node;
     }
     ts.aggregateTransformFlags = aggregateTransformFlags;
+    /**
+     * Aggregates the TransformFlags for a Node and its subtree. The flags for the subtree are
+     * computed first, then the transform flags for the current node are computed from the subtree
+     * flags and the state of the current node. Finally, the transform flags of the node are
+     * returned, excluding any flags that should not be included in its parent node's subtree
+     * flags.
+     */
     function aggregateTransformFlagsForNode(node) {
         if (node === undefined) {
-            return 0;
+            return 0 /* None */;
         }
-        if (node.transformFlags & 536870912) {
+        if (node.transformFlags & 536870912 /* HasComputedFlags */) {
             return node.transformFlags & ~ts.getTransformFlagsSubtreeExclusions(node.kind);
         }
         var subtreeFlags = aggregateTransformFlagsForSubtree(node);
@@ -48300,24 +60224,34 @@ var ts;
     }
     function aggregateTransformFlagsForNodeArray(nodes) {
         if (nodes === undefined) {
-            return 0;
+            return 0 /* None */;
         }
-        var subtreeFlags = 0;
-        var nodeArrayFlags = 0;
-        for (var _i = 0, nodes_3 = nodes; _i < nodes_3.length; _i++) {
-            var node = nodes_3[_i];
+        var subtreeFlags = 0 /* None */;
+        var nodeArrayFlags = 0 /* None */;
+        for (var _i = 0, nodes_2 = nodes; _i < nodes_2.length; _i++) {
+            var node = nodes_2[_i];
             subtreeFlags |= aggregateTransformFlagsForNode(node);
-            nodeArrayFlags |= node.transformFlags & ~536870912;
+            nodeArrayFlags |= node.transformFlags & ~536870912 /* HasComputedFlags */;
         }
-        nodes.transformFlags = nodeArrayFlags | 536870912;
+        nodes.transformFlags = nodeArrayFlags | 536870912 /* HasComputedFlags */;
         return subtreeFlags;
     }
+    /**
+     * Aggregates the transform flags for the subtree of a node.
+     */
     function aggregateTransformFlagsForSubtree(node) {
-        if (ts.hasModifier(node, 2) || (ts.isTypeNode(node) && node.kind !== 207)) {
-            return 0;
+        // We do not transform ambient declarations or types, so there is no need to
+        // recursively aggregate transform flags.
+        if (ts.hasModifier(node, 2 /* Ambient */) || (ts.isTypeNode(node) && node.kind !== 207 /* ExpressionWithTypeArguments */)) {
+            return 0 /* None */;
         }
-        return reduceEachChild(node, 0, aggregateTransformFlagsForChildNode, aggregateTransformFlagsForChildNodes);
+        // Aggregate the transform flags of each child.
+        return reduceEachChild(node, 0 /* None */, aggregateTransformFlagsForChildNode, aggregateTransformFlagsForChildNodes);
     }
+    /**
+     * Aggregates the TransformFlags of a child node with the TransformFlags of its
+     * siblings.
+     */
     function aggregateTransformFlagsForChildNode(transformFlags, node) {
         return transformFlags | aggregateTransformFlagsForNode(node);
     }
@@ -48331,30 +60265,34 @@ var ts;
             return Debug.fail((message || "Unexpected node.") + "\r\nNode " + ts.formatSyntaxKind(node.kind) + " was unexpected.", failBadSyntaxKind);
         }
         Debug.failBadSyntaxKind = failBadSyntaxKind;
-        Debug.assertEachNode = Debug.shouldAssert(1)
+        Debug.assertEachNode = Debug.shouldAssert(1 /* Normal */)
             ? function (nodes, test, message) { return Debug.assert(test === undefined || ts.every(nodes, test), message || "Unexpected node.", function () { return "Node array did not pass test '" + Debug.getFunctionName(test) + "'."; }, Debug.assertEachNode); }
             : ts.noop;
-        Debug.assertNode = Debug.shouldAssert(1)
+        Debug.assertNode = Debug.shouldAssert(1 /* Normal */)
             ? function (node, test, message) { return Debug.assert(test === undefined || test(node), message || "Unexpected node.", function () { return "Node " + ts.formatSyntaxKind(node.kind) + " did not pass test '" + Debug.getFunctionName(test) + "'."; }, Debug.assertNode); }
             : ts.noop;
-        Debug.assertOptionalNode = Debug.shouldAssert(1)
+        Debug.assertOptionalNode = Debug.shouldAssert(1 /* Normal */)
             ? function (node, test, message) { return Debug.assert(test === undefined || node === undefined || test(node), message || "Unexpected node.", function () { return "Node " + ts.formatSyntaxKind(node.kind) + " did not pass test '" + Debug.getFunctionName(test) + "'."; }, Debug.assertOptionalNode); }
             : ts.noop;
-        Debug.assertOptionalToken = Debug.shouldAssert(1)
+        Debug.assertOptionalToken = Debug.shouldAssert(1 /* Normal */)
             ? function (node, kind, message) { return Debug.assert(kind === undefined || node === undefined || node.kind === kind, message || "Unexpected node.", function () { return "Node " + ts.formatSyntaxKind(node.kind) + " was not a '" + ts.formatSyntaxKind(kind) + "' token."; }, Debug.assertOptionalToken); }
             : ts.noop;
-        Debug.assertMissingNode = Debug.shouldAssert(1)
+        Debug.assertMissingNode = Debug.shouldAssert(1 /* Normal */)
             ? function (node, message) { return Debug.assert(node === undefined, message || "Unexpected node.", function () { return "Node " + ts.formatSyntaxKind(node.kind) + " was unexpected'."; }, Debug.assertMissingNode); }
             : ts.noop;
+        /**
+         * Injects debug information into frequently used types.
+         */
         function enableDebugInfo() {
             if (isDebugInfoEnabled)
                 return;
+            // Add additional properties in debug mode to assist with debugging.
             Object.defineProperties(ts.objectAllocator.getSymbolConstructor().prototype, {
                 __debugFlags: { get: function () { return ts.formatSymbolFlags(this.flags); } }
             });
             Object.defineProperties(ts.objectAllocator.getTypeConstructor().prototype, {
                 __debugFlags: { get: function () { return ts.formatTypeFlags(this.flags); } },
-                __debugObjectFlags: { get: function () { return this.flags & 131072 ? ts.formatObjectFlags(this.objectFlags) : ""; } },
+                __debugObjectFlags: { get: function () { return this.flags & 131072 /* Object */ ? ts.formatObjectFlags(this.objectFlags) : ""; } },
                 __debugTypeToString: { value: function () { return this.checker.typeToString(this); } },
             });
             var nodeConstructors = [
@@ -48388,6 +60326,7 @@ var ts;
         Debug.enableDebugInfo = enableDebugInfo;
     })(Debug = ts.Debug || (ts.Debug = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     function getOriginalNodeId(node) {
@@ -48403,12 +60342,12 @@ var ts;
         return ts.some(node.elements, isNamedDefaultReference);
     }
     function isNamedDefaultReference(e) {
-        return e.propertyName !== undefined && e.propertyName.escapedText === "default";
+        return e.propertyName !== undefined && e.propertyName.escapedText === "default" /* Default */;
     }
     function chainBundle(transformSourceFile) {
         return transformSourceFileOrBundle;
         function transformSourceFileOrBundle(node) {
-            return node.kind === 274 ? transformSourceFile(node) : transformBundle(node);
+            return node.kind === 274 /* SourceFile */ ? transformSourceFile(node) : transformBundle(node);
         }
         function transformBundle(node) {
             return ts.createBundle(ts.map(node.sourceFiles, transformSourceFile), node.prepends);
@@ -48432,11 +60371,13 @@ var ts;
                 defaultRefCount++;
             }
         }
+        // Import star is required if there's default named refs mixed with non-default refs, or if theres non-default refs and it has a default import
         return (defaultRefCount > 0 && defaultRefCount !== bindings.elements.length) || (!!(bindings.elements.length - defaultRefCount) && ts.isDefaultImport(node));
     }
     ts.getImportNeedsImportStarHelper = getImportNeedsImportStarHelper;
     function getImportNeedsImportDefaultHelper(node) {
-        return !getImportNeedsImportStarHelper(node) && (ts.isDefaultImport(node) || (!!node.importClause && ts.isNamedImports(node.importClause.namedBindings) && containsDefaultReference(node.importClause.namedBindings)));
+        // Import default is needed if there's a default import or a default ref and no other refs (meaning an import star helper wasn't requested)
+        return !getImportNeedsImportStarHelper(node) && (ts.isDefaultImport(node) || (!!node.importClause && ts.isNamedImports(node.importClause.namedBindings) && containsDefaultReference(node.importClause.namedBindings))); // TODO: GH#18217
     }
     ts.getImportNeedsImportDefaultHelper = getImportNeedsImportDefaultHelper;
     function collectExternalModuleInfo(sourceFile, resolver, compilerOptions) {
@@ -48452,26 +60393,34 @@ var ts;
         for (var _i = 0, _a = sourceFile.statements; _i < _a.length; _i++) {
             var node = _a[_i];
             switch (node.kind) {
-                case 244:
+                case 244 /* ImportDeclaration */:
+                    // import "mod"
+                    // import x from "mod"
+                    // import * as x from "mod"
+                    // import { x, y } from "mod"
                     externalImports.push(node);
                     hasImportStarOrImportDefault = hasImportStarOrImportDefault || getImportNeedsImportStarHelper(node) || getImportNeedsImportDefaultHelper(node);
                     break;
-                case 243:
-                    if (node.moduleReference.kind === 254) {
+                case 243 /* ImportEqualsDeclaration */:
+                    if (node.moduleReference.kind === 254 /* ExternalModuleReference */) {
+                        // import x = require("mod")
                         externalImports.push(node);
                     }
                     break;
-                case 250:
+                case 250 /* ExportDeclaration */:
                     if (node.moduleSpecifier) {
                         if (!node.exportClause) {
+                            // export * from "mod"
                             externalImports.push(node);
                             hasExportStarsToExportValues = true;
                         }
                         else {
+                            // export { x, y } from "mod"
                             externalImports.push(node);
                         }
                     }
                     else {
+                        // export { x, y }
                         for (var _b = 0, _c = node.exportClause.elements; _b < _c.length; _b++) {
                             var specifier = _c[_b];
                             if (!uniqueExports.get(ts.idText(specifier.name))) {
@@ -48488,28 +60437,31 @@ var ts;
                         }
                     }
                     break;
-                case 249:
+                case 249 /* ExportAssignment */:
                     if (node.isExportEquals && !exportEquals) {
+                        // export = x
                         exportEquals = node;
                     }
                     break;
-                case 214:
-                    if (ts.hasModifier(node, 1)) {
+                case 214 /* VariableStatement */:
+                    if (ts.hasModifier(node, 1 /* Export */)) {
                         for (var _d = 0, _e = node.declarationList.declarations; _d < _e.length; _d++) {
                             var decl = _e[_d];
                             exportedNames = collectExportedVariableInfo(decl, uniqueExports, exportedNames);
                         }
                     }
                     break;
-                case 234:
-                    if (ts.hasModifier(node, 1)) {
-                        if (ts.hasModifier(node, 512)) {
+                case 234 /* FunctionDeclaration */:
+                    if (ts.hasModifier(node, 1 /* Export */)) {
+                        if (ts.hasModifier(node, 512 /* Default */)) {
+                            // export default function() { }
                             if (!hasExportDefault) {
                                 multiMapSparseArrayAdd(exportedBindings, getOriginalNodeId(node), ts.getDeclarationName(node));
                                 hasExportDefault = true;
                             }
                         }
                         else {
+                            // export function x() { }
                             var name = node.name;
                             if (!uniqueExports.get(ts.idText(name))) {
                                 multiMapSparseArrayAdd(exportedBindings, getOriginalNodeId(node), name);
@@ -48519,15 +60471,17 @@ var ts;
                         }
                     }
                     break;
-                case 235:
-                    if (ts.hasModifier(node, 1)) {
-                        if (ts.hasModifier(node, 512)) {
+                case 235 /* ClassDeclaration */:
+                    if (ts.hasModifier(node, 1 /* Export */)) {
+                        if (ts.hasModifier(node, 512 /* Default */)) {
+                            // export default class { }
                             if (!hasExportDefault) {
                                 multiMapSparseArrayAdd(exportedBindings, getOriginalNodeId(node), ts.getDeclarationName(node));
                                 hasExportDefault = true;
                             }
                         }
                         else {
+                            // export class x { }
                             var name = node.name;
                             if (name && !uniqueExports.get(ts.idText(name))) {
                                 multiMapSparseArrayAdd(exportedBindings, getOriginalNodeId(node), name);
@@ -48540,9 +60494,11 @@ var ts;
             }
         }
         var externalHelpersModuleName = ts.getOrCreateExternalHelpersModuleNameIfNeeded(sourceFile, compilerOptions, hasExportStarsToExportValues, hasImportStarOrImportDefault);
-        var externalHelpersImportDeclaration = externalHelpersModuleName && ts.createImportDeclaration(undefined, undefined, ts.createImportClause(undefined, ts.createNamespaceImport(externalHelpersModuleName)), ts.createLiteral(ts.externalHelpersModuleNameText));
+        var externalHelpersImportDeclaration = externalHelpersModuleName && ts.createImportDeclaration(
+        /*decorators*/ undefined, 
+        /*modifiers*/ undefined, ts.createImportClause(/*name*/ undefined, ts.createNamespaceImport(externalHelpersModuleName)), ts.createLiteral(ts.externalHelpersModuleNameText));
         if (externalHelpersImportDeclaration) {
-            ts.addEmitFlags(externalHelpersImportDeclaration, 67108864);
+            ts.addEmitFlags(externalHelpersImportDeclaration, 67108864 /* NeverApplyImportHelper */);
             externalImports.unshift(externalHelpersImportDeclaration);
         }
         return { externalImports: externalImports, exportSpecifiers: exportSpecifiers, exportEquals: exportEquals, hasExportStarsToExportValues: hasExportStarsToExportValues, exportedBindings: exportedBindings, exportedNames: exportedNames, externalHelpersImportDeclaration: externalHelpersImportDeclaration };
@@ -48566,6 +60522,7 @@ var ts;
         }
         return exportedNames;
     }
+    /** Use a sparse array as a multi-map. */
     function multiMapSparseArrayAdd(map, key, value) {
         var values = map[key];
         if (values) {
@@ -48576,13 +60533,22 @@ var ts;
         }
         return values;
     }
+    /**
+     * Used in the module transformer to check if an expression is reasonably without sideeffect,
+     *  and thus better to copy into multiple places rather than to cache in a temporary variable
+     *  - this is mostly subjective beyond the requirement that the expression not be sideeffecting
+     */
     function isSimpleCopiableExpression(expression) {
         return ts.isStringLiteralLike(expression) ||
-            expression.kind === 8 ||
+            expression.kind === 8 /* NumericLiteral */ ||
             ts.isKeyword(expression.kind) ||
             ts.isIdentifier(expression);
     }
     ts.isSimpleCopiableExpression = isSimpleCopiableExpression;
+    /**
+     * @param input Template string input strings
+     * @param args Names which need to be made file-level unique
+     */
     function helperString(input) {
         var args = [];
         for (var _i = 1; _i < arguments.length; _i++) {
@@ -48600,8 +60566,25 @@ var ts;
     }
     ts.helperString = helperString;
 })(ts || (ts = {}));
+/*@internal*/
 var ts;
 (function (ts) {
+    var FlattenLevel;
+    (function (FlattenLevel) {
+        FlattenLevel[FlattenLevel["All"] = 0] = "All";
+        FlattenLevel[FlattenLevel["ObjectRest"] = 1] = "ObjectRest";
+    })(FlattenLevel = ts.FlattenLevel || (ts.FlattenLevel = {}));
+    /**
+     * Flattens a DestructuringAssignment or a VariableDeclaration to an expression.
+     *
+     * @param node The node to flatten.
+     * @param visitor An optional visitor used to visit initializers.
+     * @param context The transformation context.
+     * @param level Indicates the extent to which flattening should occur.
+     * @param needsValue An optional value indicating whether the value from the right-hand-side of
+     * the destructuring assignment is needed as part of a larger expression.
+     * @param createAssignmentCallback An optional callback used to create the assignment expression.
+     */
     function flattenDestructuringAssignment(node, visitor, context, level, needsValue, createAssignmentCallback) {
         var location = node;
         var value;
@@ -48633,16 +60616,30 @@ var ts;
         if (value) {
             value = ts.visitNode(value, visitor, ts.isExpression);
             if (ts.isIdentifier(value) && bindingOrAssignmentElementAssignsToName(node, value.escapedText)) {
-                value = ensureIdentifier(flattenContext, value, false, location);
+                // If the right-hand value of the assignment is also an assignment target then
+                // we need to cache the right-hand value.
+                value = ensureIdentifier(flattenContext, value, /*reuseIdentifierExpressions*/ false, location);
             }
             else if (needsValue) {
-                value = ensureIdentifier(flattenContext, value, true, location);
+                // If the right-hand value of the destructuring assignment needs to be preserved (as
+                // is the case when the destructuring assignment is part of a larger expression),
+                // then we need to cache the right-hand value.
+                //
+                // The source map location for the assignment should point to the entire binary
+                // expression.
+                value = ensureIdentifier(flattenContext, value, /*reuseIdentifierExpressions*/ true, location);
             }
             else if (ts.nodeIsSynthesized(node)) {
+                // Generally, the source map location for a destructuring assignment is the root
+                // expression.
+                //
+                // However, if the root expression is synthesized (as in the case
+                // of the initializer when transforming a ForOfStatement), then the source map
+                // location should point to the right-hand value of the expression.
                 location = value;
             }
         }
-        flattenBindingOrAssignmentElement(flattenContext, node, value, location, ts.isDestructuringAssignment(node));
+        flattenBindingOrAssignmentElement(flattenContext, node, value, location, /*skipInitializer*/ ts.isDestructuringAssignment(node));
         if (value && needsValue) {
             if (!ts.some(expressions)) {
                 return value;
@@ -48651,7 +60648,9 @@ var ts;
         }
         return ts.aggregateTransformFlags(ts.inlineExpressions(expressions)) || ts.createOmittedExpression();
         function emitExpression(expression) {
-            ts.setEmitFlags(expression, 64);
+            // NOTE: this completely disables source maps, but aligns with the behavior of
+            //       `emitAssignment` in the old emitter.
+            ts.setEmitFlags(expression, 64 /* NoNestedSourceMaps */);
             ts.aggregateTransformFlags(expression);
             expressions = ts.append(expressions, expression);
         }
@@ -48666,7 +60665,7 @@ var ts;
     }
     ts.flattenDestructuringAssignment = flattenDestructuringAssignment;
     function bindingOrAssignmentElementAssignsToName(element, escapedName) {
-        var target = ts.getTargetOfBindingOrAssignmentElement(element);
+        var target = ts.getTargetOfBindingOrAssignmentElement(element); // TODO: GH#18217
         if (ts.isBindingOrAssignmentPattern(target)) {
             return bindingOrAssignmentPatternAssignsToName(target, escapedName);
         }
@@ -48685,6 +60684,17 @@ var ts;
         }
         return false;
     }
+    /**
+     * Flattens a VariableDeclaration or ParameterDeclaration to one or more variable declarations.
+     *
+     * @param node The node to flatten.
+     * @param visitor An optional visitor used to visit initializers.
+     * @param context The transformation context.
+     * @param boundValue The value bound to the declaration.
+     * @param skipInitializer A value indicating whether to ignore the initializer of `node`.
+     * @param hoistTempVariables Indicates whether temporary variables should not be recorded in-line.
+     * @param level Indicates the extent to which flattening should occur.
+     */
     function flattenDestructuringBinding(node, visitor, context, level, rval, hoistTempVariables, skipInitializer) {
         if (hoistTempVariables === void 0) { hoistTempVariables = false; }
         var pendingExpressions;
@@ -48705,17 +60715,19 @@ var ts;
         if (ts.isVariableDeclaration(node)) {
             var initializer = ts.getInitializerOfBindingOrAssignmentElement(node);
             if (initializer && ts.isIdentifier(initializer) && bindingOrAssignmentElementAssignsToName(node, initializer.escapedText)) {
-                initializer = ensureIdentifier(flattenContext, initializer, false, initializer);
+                // If the right-hand value of the assignment is also an assignment target then
+                // we need to cache the right-hand value.
+                initializer = ensureIdentifier(flattenContext, initializer, /*reuseIdentifierExpressions*/ false, initializer);
                 node = ts.updateVariableDeclaration(node, node.name, node.type, initializer);
             }
         }
         flattenBindingOrAssignmentElement(flattenContext, node, rval, node, skipInitializer);
         if (pendingExpressions) {
-            var temp = ts.createTempVariable(undefined);
+            var temp = ts.createTempVariable(/*recordTempVariable*/ undefined);
             if (hoistTempVariables) {
                 var value = ts.inlineExpressions(pendingExpressions);
                 pendingExpressions = undefined;
-                emitBindingOrAssignment(temp, value, undefined, undefined);
+                emitBindingOrAssignment(temp, value, /*location*/ undefined, /*original*/ undefined);
             }
             else {
                 context.hoistVariableDeclaration(temp);
@@ -48727,11 +60739,12 @@ var ts;
         }
         for (var _i = 0, pendingDeclarations_1 = pendingDeclarations; _i < pendingDeclarations_1.length; _i++) {
             var _a = pendingDeclarations_1[_i], pendingExpressions_1 = _a.pendingExpressions, name = _a.name, value = _a.value, location = _a.location, original = _a.original;
-            var variable = ts.createVariableDeclaration(name, undefined, pendingExpressions_1 ? ts.inlineExpressions(ts.append(pendingExpressions_1, value)) : value);
+            var variable = ts.createVariableDeclaration(name, 
+            /*type*/ undefined, pendingExpressions_1 ? ts.inlineExpressions(ts.append(pendingExpressions_1, value)) : value);
             variable.original = original;
             ts.setTextRange(variable, location);
             if (ts.isIdentifier(name)) {
-                ts.setEmitFlags(variable, 64);
+                ts.setEmitFlags(variable, 64 /* NoNestedSourceMaps */);
             }
             ts.aggregateTransformFlags(variable);
             declarations.push(variable);
@@ -48750,17 +60763,29 @@ var ts;
         }
     }
     ts.flattenDestructuringBinding = flattenDestructuringBinding;
+    /**
+     * Flattens a BindingOrAssignmentElement into zero or more bindings or assignments.
+     *
+     * @param flattenContext Options used to control flattening.
+     * @param element The element to flatten.
+     * @param value The current RHS value to assign to the element.
+     * @param location The location to use for source maps and comments.
+     * @param skipInitializer An optional value indicating whether to include the initializer
+     * for the element.
+     */
     function flattenBindingOrAssignmentElement(flattenContext, element, value, location, skipInitializer) {
         if (!skipInitializer) {
             var initializer = ts.visitNode(ts.getInitializerOfBindingOrAssignmentElement(element), flattenContext.visitor, ts.isExpression);
             if (initializer) {
+                // Combine value and initializer
                 value = value ? createDefaultValueCheck(flattenContext, value, initializer, location) : initializer;
             }
             else if (!value) {
+                // Use 'void 0' in absence of value and initializer
                 value = ts.createVoidZero();
             }
         }
-        var bindingTarget = ts.getTargetOfBindingOrAssignmentElement(element);
+        var bindingTarget = ts.getTargetOfBindingOrAssignmentElement(element); // TODO: GH#18217
         if (ts.isObjectBindingOrAssignmentPattern(bindingTarget)) {
             flattenObjectBindingOrAssignmentPattern(flattenContext, element, bindingTarget, value, location);
         }
@@ -48768,13 +60793,26 @@ var ts;
             flattenArrayBindingOrAssignmentPattern(flattenContext, element, bindingTarget, value, location);
         }
         else {
-            flattenContext.emitBindingOrAssignment(bindingTarget, value, location, element);
+            flattenContext.emitBindingOrAssignment(bindingTarget, value, location, /*original*/ element); // TODO: GH#18217
         }
     }
+    /**
+     * Flattens an ObjectBindingOrAssignmentPattern into zero or more bindings or assignments.
+     *
+     * @param flattenContext Options used to control flattening.
+     * @param parent The parent element of the pattern.
+     * @param pattern The ObjectBindingOrAssignmentPattern to flatten.
+     * @param value The current RHS value to assign to the element.
+     * @param location The location to use for source maps and comments.
+     */
     function flattenObjectBindingOrAssignmentPattern(flattenContext, parent, pattern, value, location) {
         var elements = ts.getElementsOfBindingOrAssignmentPattern(pattern);
         var numElements = elements.length;
         if (numElements !== 1) {
+            // For anything other than a single-element destructuring we need to generate a temporary
+            // to ensure value is evaluated exactly once. Additionally, if we have zero elements
+            // we need to emit *something* to ensure that in case a 'var' keyword was already emitted,
+            // so in that case, we'll intentionally create that temporary.
             var reuseIdentifierExpressions = !ts.isDeclarationBindingElement(parent) || numElements !== 0;
             value = ensureIdentifier(flattenContext, value, reuseIdentifierExpressions, location);
         }
@@ -48784,9 +60822,9 @@ var ts;
             var element = elements[i];
             if (!ts.getRestIndicatorOfBindingOrAssignmentElement(element)) {
                 var propertyName = ts.getPropertyNameOfBindingOrAssignmentElement(element);
-                if (flattenContext.level >= 1
-                    && !(element.transformFlags & (524288 | 1048576))
-                    && !(ts.getTargetOfBindingOrAssignmentElement(element).transformFlags & (524288 | 1048576))
+                if (flattenContext.level >= 1 /* ObjectRest */
+                    && !(element.transformFlags & (524288 /* ContainsRest */ | 1048576 /* ContainsObjectRest */))
+                    && !(ts.getTargetOfBindingOrAssignmentElement(element).transformFlags & (524288 /* ContainsRest */ | 1048576 /* ContainsObjectRest */))
                     && !ts.isComputedPropertyName(propertyName)) {
                     bindingElements = ts.append(bindingElements, element);
                 }
@@ -48799,7 +60837,7 @@ var ts;
                     if (ts.isComputedPropertyName(propertyName)) {
                         computedTempVariables = ts.append(computedTempVariables, rhsValue.argumentExpression);
                     }
-                    flattenBindingOrAssignmentElement(flattenContext, element, rhsValue, element);
+                    flattenBindingOrAssignmentElement(flattenContext, element, rhsValue, /*location*/ element);
                 }
             }
             else if (i === numElements - 1) {
@@ -48807,7 +60845,7 @@ var ts;
                     flattenContext.emitBindingOrAssignment(flattenContext.createObjectBindingOrAssignmentPattern(bindingElements), value, location, pattern);
                     bindingElements = undefined;
                 }
-                var rhsValue = createRestCall(flattenContext.context, value, elements, computedTempVariables, pattern);
+                var rhsValue = createRestCall(flattenContext.context, value, elements, computedTempVariables, pattern); // TODO: GH#18217
                 flattenBindingOrAssignmentElement(flattenContext, element, rhsValue, element);
             }
         }
@@ -48815,16 +60853,33 @@ var ts;
             flattenContext.emitBindingOrAssignment(flattenContext.createObjectBindingOrAssignmentPattern(bindingElements), value, location, pattern);
         }
     }
+    /**
+     * Flattens an ArrayBindingOrAssignmentPattern into zero or more bindings or assignments.
+     *
+     * @param flattenContext Options used to control flattening.
+     * @param parent The parent element of the pattern.
+     * @param pattern The ArrayBindingOrAssignmentPattern to flatten.
+     * @param value The current RHS value to assign to the element.
+     * @param location The location to use for source maps and comments.
+     */
     function flattenArrayBindingOrAssignmentPattern(flattenContext, parent, pattern, value, location) {
         var elements = ts.getElementsOfBindingOrAssignmentPattern(pattern);
         var numElements = elements.length;
-        if (flattenContext.level < 1 && flattenContext.downlevelIteration) {
+        if (flattenContext.level < 1 /* ObjectRest */ && flattenContext.downlevelIteration) {
+            // Read the elements of the iterable into an array
             value = ensureIdentifier(flattenContext, ts.createReadHelper(flattenContext.context, value, numElements > 0 && ts.getRestIndicatorOfBindingOrAssignmentElement(elements[numElements - 1])
                 ? undefined
-                : numElements, location), false, location);
+                : numElements, location), 
+            /*reuseIdentifierExpressions*/ false, location);
         }
-        else if (numElements !== 1 && (flattenContext.level < 1 || numElements === 0)
+        else if (numElements !== 1 && (flattenContext.level < 1 /* ObjectRest */ || numElements === 0)
             || ts.every(elements, ts.isOmittedExpression)) {
+            // For anything other than a single-element destructuring we need to generate a temporary
+            // to ensure value is evaluated exactly once. Additionally, if we have zero elements
+            // we need to emit *something* to ensure that in case a 'var' keyword was already emitted,
+            // so in that case, we'll intentionally create that temporary.
+            // Or all the elements of the binding pattern are omitted expression such as "var [,] = [1,2]",
+            // then we will create temporary variable.
             var reuseIdentifierExpressions = !ts.isDeclarationBindingElement(parent) || numElements !== 0;
             value = ensureIdentifier(flattenContext, value, reuseIdentifierExpressions, location);
         }
@@ -48832,9 +60887,11 @@ var ts;
         var restContainingElements;
         for (var i = 0; i < numElements; i++) {
             var element = elements[i];
-            if (flattenContext.level >= 1) {
-                if (element.transformFlags & 1048576) {
-                    var temp = ts.createTempVariable(undefined);
+            if (flattenContext.level >= 1 /* ObjectRest */) {
+                // If an array pattern contains an ObjectRest, we must cache the result so that we
+                // can perform the ObjectRest destructuring in a different declaration
+                if (element.transformFlags & 1048576 /* ContainsObjectRest */) {
+                    var temp = ts.createTempVariable(/*recordTempVariable*/ undefined);
                     if (flattenContext.hoistTempVariables) {
                         flattenContext.context.hoistVariableDeclaration(temp);
                     }
@@ -48850,11 +60907,11 @@ var ts;
             }
             else if (!ts.getRestIndicatorOfBindingOrAssignmentElement(element)) {
                 var rhsValue = ts.createElementAccess(value, i);
-                flattenBindingOrAssignmentElement(flattenContext, element, rhsValue, element);
+                flattenBindingOrAssignmentElement(flattenContext, element, rhsValue, /*location*/ element);
             }
             else if (i === numElements - 1) {
                 var rhsValue = ts.createArraySlice(value, i);
-                flattenBindingOrAssignmentElement(flattenContext, element, rhsValue, element);
+                flattenBindingOrAssignmentElement(flattenContext, element, rhsValue, /*location*/ element);
             }
         }
         if (bindingElements) {
@@ -48867,13 +60924,31 @@ var ts;
             }
         }
     }
+    /**
+     * Creates an expression used to provide a default value if a value is `undefined` at runtime.
+     *
+     * @param flattenContext Options used to control flattening.
+     * @param value The RHS value to test.
+     * @param defaultValue The default value to use if `value` is `undefined` at runtime.
+     * @param location The location to use for source maps and comments.
+     */
     function createDefaultValueCheck(flattenContext, value, defaultValue, location) {
-        value = ensureIdentifier(flattenContext, value, true, location);
+        value = ensureIdentifier(flattenContext, value, /*reuseIdentifierExpressions*/ true, location);
         return ts.createConditional(ts.createTypeCheck(value, "undefined"), defaultValue, value);
     }
+    /**
+     * Creates either a PropertyAccessExpression or an ElementAccessExpression for the
+     * right-hand side of a transformed destructuring assignment.
+     *
+     * @link https://tc39.github.io/ecma262/#sec-runtime-semantics-keyeddestructuringassignmentevaluation
+     *
+     * @param flattenContext Options used to control flattening.
+     * @param value The RHS value that is the source of the property.
+     * @param propertyName The destructuring property name.
+     */
     function createDestructuringPropertyAccess(flattenContext, value, propertyName) {
         if (ts.isComputedPropertyName(propertyName)) {
-            var argumentExpression = ensureIdentifier(flattenContext, ts.visitNode(propertyName.expression, flattenContext.visitor), false, propertyName);
+            var argumentExpression = ensureIdentifier(flattenContext, ts.visitNode(propertyName.expression, flattenContext.visitor), /*reuseIdentifierExpressions*/ false, /*location*/ propertyName);
             return ts.createElementAccess(value, argumentExpression);
         }
         else if (ts.isStringOrNumericLiteral(propertyName)) {
@@ -48886,18 +60961,29 @@ var ts;
             return ts.createPropertyAccess(value, name);
         }
     }
+    /**
+     * Ensures that there exists a declared identifier whose value holds the given expression.
+     * This function is useful to ensure that the expression's value can be read from in subsequent expressions.
+     * Unless 'reuseIdentifierExpressions' is false, 'value' will be returned if it is just an identifier.
+     *
+     * @param flattenContext Options used to control flattening.
+     * @param value the expression whose value needs to be bound.
+     * @param reuseIdentifierExpressions true if identifier expressions can simply be returned;
+     * false if it is necessary to always emit an identifier.
+     * @param location The location to use for source maps and comments.
+     */
     function ensureIdentifier(flattenContext, value, reuseIdentifierExpressions, location) {
         if (ts.isIdentifier(value) && reuseIdentifierExpressions) {
             return value;
         }
         else {
-            var temp = ts.createTempVariable(undefined);
+            var temp = ts.createTempVariable(/*recordTempVariable*/ undefined);
             if (flattenContext.hoistTempVariables) {
                 flattenContext.context.hoistVariableDeclaration(temp);
                 flattenContext.emitExpression(ts.setTextRange(ts.createAssignment(temp, value), location));
             }
             else {
-                flattenContext.emitBindingOrAssignment(temp, value, location, undefined);
+                flattenContext.emitBindingOrAssignment(temp, value, location, /*original*/ undefined);
             }
             return temp;
         }
@@ -48917,7 +61003,7 @@ var ts;
         return ts.createObjectLiteral(ts.map(elements, ts.convertToObjectAssignmentElement));
     }
     function makeBindingElement(name) {
-        return ts.createBindingElement(undefined, undefined, name);
+        return ts.createBindingElement(/*dotDotDotToken*/ undefined, /*propertyName*/ undefined, name);
     }
     function makeAssignmentElement(name) {
         return name;
@@ -48927,6 +61013,9 @@ var ts;
         scoped: false,
         text: "\n            var __rest = (this && this.__rest) || function (s, e) {\n                var t = {};\n                for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0)\n                    t[p] = s[p];\n                if (s != null && typeof Object.getOwnPropertySymbols === \"function\")\n                    for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) if (e.indexOf(p[i]) < 0)\n                        t[p[i]] = s[p[i]];\n                return t;\n            };"
     };
+    /** Given value: o, propName: p, pattern: { a, b, ...p } from the original statement
+     * `{ a, b, ...p } = o`, create `p = __rest(o, ["a", "b"]);`
+     */
     function createRestCall(context, value, elements, computedTempVariables, location) {
         context.requestEmitHelper(restHelper);
         var propertyNames = [];
@@ -48937,6 +61026,7 @@ var ts;
                 if (ts.isComputedPropertyName(propertyName)) {
                     var temp = computedTempVariables[computedTempVariableOffset];
                     computedTempVariableOffset++;
+                    // typeof _tmp === "symbol" ? _tmp : _tmp + ""
                     propertyNames.push(ts.createConditional(ts.createTypeCheck(temp, "symbol"), temp, ts.createAdd(temp, ts.createLiteral(""))));
                 }
                 else {
@@ -48944,15 +61034,45 @@ var ts;
                 }
             }
         }
-        return ts.createCall(ts.getHelperName("__rest"), undefined, [
+        return ts.createCall(ts.getHelperName("__rest"), 
+        /*typeArguments*/ undefined, [
             value,
             ts.setTextRange(ts.createArrayLiteral(propertyNames), location)
         ]);
     }
 })(ts || (ts = {}));
+/*@internal*/
 var ts;
 (function (ts) {
+    /**
+     * Indicates whether to emit type metadata in the new format.
+     */
     var USE_NEW_TYPE_METADATA_FORMAT = false;
+    var TypeScriptSubstitutionFlags;
+    (function (TypeScriptSubstitutionFlags) {
+        /** Enables substitutions for decorated classes. */
+        TypeScriptSubstitutionFlags[TypeScriptSubstitutionFlags["ClassAliases"] = 1] = "ClassAliases";
+        /** Enables substitutions for namespace exports. */
+        TypeScriptSubstitutionFlags[TypeScriptSubstitutionFlags["NamespaceExports"] = 2] = "NamespaceExports";
+        /* Enables substitutions for unqualified enum members */
+        TypeScriptSubstitutionFlags[TypeScriptSubstitutionFlags["NonQualifiedEnumMembers"] = 8] = "NonQualifiedEnumMembers";
+    })(TypeScriptSubstitutionFlags || (TypeScriptSubstitutionFlags = {}));
+    var ClassFacts;
+    (function (ClassFacts) {
+        ClassFacts[ClassFacts["None"] = 0] = "None";
+        ClassFacts[ClassFacts["HasStaticInitializedProperties"] = 1] = "HasStaticInitializedProperties";
+        ClassFacts[ClassFacts["HasConstructorDecorators"] = 2] = "HasConstructorDecorators";
+        ClassFacts[ClassFacts["HasMemberDecorators"] = 4] = "HasMemberDecorators";
+        ClassFacts[ClassFacts["IsExportOfNamespace"] = 8] = "IsExportOfNamespace";
+        ClassFacts[ClassFacts["IsNamedExternalExport"] = 16] = "IsNamedExternalExport";
+        ClassFacts[ClassFacts["IsDefaultExternalExport"] = 32] = "IsDefaultExternalExport";
+        ClassFacts[ClassFacts["IsDerivedClass"] = 64] = "IsDerivedClass";
+        ClassFacts[ClassFacts["UseImmediatelyInvokedFunctionExpression"] = 128] = "UseImmediatelyInvokedFunctionExpression";
+        ClassFacts[ClassFacts["HasAnyDecorators"] = 6] = "HasAnyDecorators";
+        ClassFacts[ClassFacts["NeedsName"] = 5] = "NeedsName";
+        ClassFacts[ClassFacts["MayNeedImmediatelyInvokedFunctionExpression"] = 7] = "MayNeedImmediatelyInvokedFunctionExpression";
+        ClassFacts[ClassFacts["IsExported"] = 56] = "IsExported";
+    })(ClassFacts || (ClassFacts = {}));
     function transformTypeScript(context) {
         var startLexicalEnvironment = context.startLexicalEnvironment, resumeLexicalEnvironment = context.resumeLexicalEnvironment, endLexicalEnvironment = context.endLexicalEnvironment, hoistVariableDeclaration = context.hoistVariableDeclaration;
         var resolver = context.getEmitResolver();
@@ -48960,36 +61080,61 @@ var ts;
         var strictNullChecks = ts.getStrictOptionValue(compilerOptions, "strictNullChecks");
         var languageVersion = ts.getEmitScriptTarget(compilerOptions);
         var moduleKind = ts.getEmitModuleKind(compilerOptions);
+        // Save the previous transformation hooks.
         var previousOnEmitNode = context.onEmitNode;
         var previousOnSubstituteNode = context.onSubstituteNode;
+        // Set new transformation hooks.
         context.onEmitNode = onEmitNode;
         context.onSubstituteNode = onSubstituteNode;
-        context.enableSubstitution(185);
-        context.enableSubstitution(186);
+        // Enable substitution for property/element access to emit const enum values.
+        context.enableSubstitution(185 /* PropertyAccessExpression */);
+        context.enableSubstitution(186 /* ElementAccessExpression */);
+        // These variables contain state that changes as we descend into the tree.
         var currentSourceFile;
         var currentNamespace;
         var currentNamespaceContainerName;
         var currentScope;
         var currentScopeFirstDeclarationsOfName;
+        /**
+         * Keeps track of whether expression substitution has been enabled for specific edge cases.
+         * They are persisted between each SourceFile transformation and should not be reset.
+         */
         var enabledSubstitutions;
+        /**
+         * A map that keeps track of aliases created for classes with decorators to avoid issues
+         * with the double-binding behavior of classes.
+         */
         var classAliases;
+        /**
+         * Keeps track of whether we are within any containing namespaces when performing
+         * just-in-time substitution while printing an expression identifier.
+         */
         var applicableSubstitutions;
+        /**
+         * Tracks what computed name expressions originating from elided names must be inlined
+         * at the next execution site, in document order
+         */
         var pendingExpressions;
         return transformSourceFileOrBundle;
         function transformSourceFileOrBundle(node) {
-            if (node.kind === 275) {
+            if (node.kind === 275 /* Bundle */) {
                 return transformBundle(node);
             }
             return transformSourceFile(node);
         }
         function transformBundle(node) {
             return ts.createBundle(node.sourceFiles.map(transformSourceFile), ts.mapDefined(node.prepends, function (prepend) {
-                if (prepend.kind === 277) {
-                    return ts.createUnparsedSourceFile(prepend.javascriptText);
+                if (prepend.kind === 277 /* InputFiles */) {
+                    return ts.createUnparsedSourceFile(prepend.javascriptText, prepend.javascriptMapText);
                 }
                 return prepend;
             }));
         }
+        /**
+         * Transform TypeScript-specific syntax in a SourceFile.
+         *
+         * @param node A SourceFile node.
+         */
         function transformSourceFile(node) {
             if (node.isDeclarationFile) {
                 return node;
@@ -49000,61 +61145,100 @@ var ts;
             currentSourceFile = undefined;
             return visited;
         }
+        /**
+         * Visits a node, saving and restoring state variables on the stack.
+         *
+         * @param node The node to visit.
+         */
         function saveStateAndInvoke(node, f) {
+            // Save state
             var savedCurrentScope = currentScope;
             var savedCurrentScopeFirstDeclarationsOfName = currentScopeFirstDeclarationsOfName;
+            // Handle state changes before visiting a node.
             onBeforeVisitNode(node);
             var visited = f(node);
+            // Restore state
             if (currentScope !== savedCurrentScope) {
                 currentScopeFirstDeclarationsOfName = savedCurrentScopeFirstDeclarationsOfName;
             }
             currentScope = savedCurrentScope;
             return visited;
         }
+        /**
+         * Performs actions that should always occur immediately before visiting a node.
+         *
+         * @param node The node to visit.
+         */
         function onBeforeVisitNode(node) {
             switch (node.kind) {
-                case 274:
-                case 241:
-                case 240:
-                case 213:
+                case 274 /* SourceFile */:
+                case 241 /* CaseBlock */:
+                case 240 /* ModuleBlock */:
+                case 213 /* Block */:
                     currentScope = node;
                     currentScopeFirstDeclarationsOfName = undefined;
                     break;
-                case 235:
-                case 234:
-                    if (ts.hasModifier(node, 2)) {
+                case 235 /* ClassDeclaration */:
+                case 234 /* FunctionDeclaration */:
+                    if (ts.hasModifier(node, 2 /* Ambient */)) {
                         break;
                     }
+                    // Record these declarations provided that they have a name.
                     if (node.name) {
                         recordEmittedDeclarationInScope(node);
                     }
                     else {
-                        ts.Debug.assert(node.kind === 235 || ts.hasModifier(node, 512));
+                        // These nodes should always have names unless they are default-exports;
+                        // however, class declaration parsing allows for undefined names, so syntactically invalid
+                        // programs may also have an undefined name.
+                        ts.Debug.assert(node.kind === 235 /* ClassDeclaration */ || ts.hasModifier(node, 512 /* Default */));
                     }
                     break;
             }
         }
+        /**
+         * General-purpose node visitor.
+         *
+         * @param node The node to visit.
+         */
         function visitor(node) {
             return saveStateAndInvoke(node, visitorWorker);
         }
+        /**
+         * Visits and possibly transforms any node.
+         *
+         * @param node The node to visit.
+         */
         function visitorWorker(node) {
-            if (node.transformFlags & 1) {
+            if (node.transformFlags & 1 /* TypeScript */) {
+                // This node is explicitly marked as TypeScript, so we should transform the node.
                 return visitTypeScript(node);
             }
-            else if (node.transformFlags & 2) {
+            else if (node.transformFlags & 2 /* ContainsTypeScript */) {
+                // This node contains TypeScript, so we should visit its children.
                 return ts.visitEachChild(node, visitor, context);
             }
             return node;
         }
+        /**
+         * Specialized visitor that visits the immediate children of a SourceFile.
+         *
+         * @param node The node to visit.
+         */
         function sourceElementVisitor(node) {
             return saveStateAndInvoke(node, sourceElementVisitorWorker);
         }
+        /**
+         * Specialized visitor that visits the immediate children of a SourceFile.
+         *
+         * @param node The node to visit.
+         */
         function sourceElementVisitorWorker(node) {
             switch (node.kind) {
-                case 244:
-                case 243:
-                case 249:
-                case 250:
+                case 244 /* ImportDeclaration */:
+                case 243 /* ImportEqualsDeclaration */:
+                case 249 /* ExportAssignment */:
+                case 250 /* ExportDeclaration */:
                     return visitEllidableStatement(node);
                 default:
                     return visitorWorker(node);
@@ -49063,168 +61247,265 @@ var ts;
         function visitEllidableStatement(node) {
             var parsed = ts.getParseTreeNode(node);
             if (parsed !== node) {
-                if (node.transformFlags & 2) {
+                // If the node has been transformed by a `before` transformer, perform no ellision on it
+                // As the type information we would attempt to lookup to perform ellision is potentially unavailable for the synthesized nodes
+                // We do not reuse `visitorWorker`, as the ellidable statement syntax kinds are technically unrecognized by the switch-case in `visitTypeScript`,
+                // and will trigger debug failures when debug verbosity is turned up
+                if (node.transformFlags & 2 /* ContainsTypeScript */) {
+                    // This node contains TypeScript, so we should visit its children.
                     return ts.visitEachChild(node, visitor, context);
                 }
+                // Otherwise, we can just return the node
                 return node;
             }
             switch (node.kind) {
-                case 244:
+                case 244 /* ImportDeclaration */:
                     return visitImportDeclaration(node);
-                case 243:
+                case 243 /* ImportEqualsDeclaration */:
                     return visitImportEqualsDeclaration(node);
-                case 249:
+                case 249 /* ExportAssignment */:
                     return visitExportAssignment(node);
-                case 250:
+                case 250 /* ExportDeclaration */:
                     return visitExportDeclaration(node);
                 default:
                     ts.Debug.fail("Unhandled ellided statement");
             }
         }
+        /**
+         * Specialized visitor that visits the immediate children of a namespace.
+         *
+         * @param node The node to visit.
+         */
         function namespaceElementVisitor(node) {
             return saveStateAndInvoke(node, namespaceElementVisitorWorker);
         }
+        /**
+         * Specialized visitor that visits the immediate children of a namespace.
+         *
+         * @param node The node to visit.
+         */
         function namespaceElementVisitorWorker(node) {
-            if (node.kind === 250 ||
-                node.kind === 244 ||
-                node.kind === 245 ||
-                (node.kind === 243 &&
-                    node.moduleReference.kind === 254)) {
+            if (node.kind === 250 /* ExportDeclaration */ ||
+                node.kind === 244 /* ImportDeclaration */ ||
+                node.kind === 245 /* ImportClause */ ||
+                (node.kind === 243 /* ImportEqualsDeclaration */ &&
+                    node.moduleReference.kind === 254 /* ExternalModuleReference */)) {
+                // do not emit ES6 imports and exports since they are illegal inside a namespace
                 return undefined;
             }
-            else if (node.transformFlags & 1 || ts.hasModifier(node, 1)) {
+            else if (node.transformFlags & 1 /* TypeScript */ || ts.hasModifier(node, 1 /* Export */)) {
+                // This node is explicitly marked as TypeScript, or is exported at the namespace
+                // level, so we should transform the node.
                 return visitTypeScript(node);
             }
-            else if (node.transformFlags & 2) {
+            else if (node.transformFlags & 2 /* ContainsTypeScript */) {
+                // This node contains TypeScript, so we should visit its children.
                 return ts.visitEachChild(node, visitor, context);
             }
             return node;
         }
+        /**
+         * Specialized visitor that visits the immediate children of a class with TypeScript syntax.
+         *
+         * @param node The node to visit.
+         */
         function classElementVisitor(node) {
             return saveStateAndInvoke(node, classElementVisitorWorker);
         }
+        /**
+         * Specialized visitor that visits the immediate children of a class with TypeScript syntax.
+         *
+         * @param node The node to visit.
+         */
         function classElementVisitorWorker(node) {
             switch (node.kind) {
-                case 155:
+                case 155 /* Constructor */:
+                    // TypeScript constructors are transformed in `visitClassDeclaration`.
+                    // We elide them here as `visitorWorker` checks transform flags, which could
+                    // erronously include an ES6 constructor without TypeScript syntax.
                     return undefined;
-                case 152:
-                case 160:
-                case 156:
-                case 157:
-                case 154:
+                case 152 /* PropertyDeclaration */:
+                case 160 /* IndexSignature */:
+                case 156 /* GetAccessor */:
+                case 157 /* SetAccessor */:
+                case 154 /* MethodDeclaration */:
+                    // Fallback to the default visit behavior.
                     return visitorWorker(node);
-                case 212:
+                case 212 /* SemicolonClassElement */:
                     return node;
                 default:
                     return ts.Debug.failBadSyntaxKind(node);
             }
         }
         function modifierVisitor(node) {
-            if (ts.modifierToFlag(node.kind) & 2270) {
+            if (ts.modifierToFlag(node.kind) & 2270 /* TypeScriptModifier */) {
                 return undefined;
             }
-            else if (currentNamespace && node.kind === 84) {
+            else if (currentNamespace && node.kind === 84 /* ExportKeyword */) {
                 return undefined;
             }
             return node;
         }
+        /**
+         * Branching visitor, visits a TypeScript syntax node.
+         *
+         * @param node The node to visit.
+         */
         function visitTypeScript(node) {
-            if (ts.hasModifier(node, 2) && ts.isStatement(node)) {
+            if (ts.hasModifier(node, 2 /* Ambient */) && ts.isStatement(node)) {
+                // TypeScript ambient declarations are elided, but some comments may be preserved.
+                // See the implementation of `getLeadingComments` in comments.ts for more details.
                 return ts.createNotEmittedStatement(node);
             }
             switch (node.kind) {
-                case 84:
-                case 79:
+                case 84 /* ExportKeyword */:
+                case 79 /* DefaultKeyword */:
+                    // ES6 export and default modifiers are elided when inside a namespace.
                     return currentNamespace ? undefined : node;
-                case 114:
-                case 112:
-                case 113:
-                case 117:
-                case 76:
-                case 124:
-                case 132:
-                case 167:
-                case 168:
-                case 166:
-                case 161:
-                case 148:
-                case 119:
-                case 142:
-                case 122:
-                case 137:
-                case 134:
-                case 131:
-                case 105:
-                case 138:
-                case 164:
-                case 163:
-                case 165:
-                case 162:
-                case 169:
-                case 170:
-                case 171:
-                case 173:
-                case 174:
-                case 175:
-                case 176:
-                case 177:
-                case 178:
-                case 160:
-                case 150:
-                case 237:
+                case 114 /* PublicKeyword */:
+                case 112 /* PrivateKeyword */:
+                case 113 /* ProtectedKeyword */:
+                case 117 /* AbstractKeyword */:
+                case 76 /* ConstKeyword */:
+                case 124 /* DeclareKeyword */:
+                case 132 /* ReadonlyKeyword */:
+                // TypeScript accessibility and readonly modifiers are elided.
+                case 167 /* ArrayType */:
+                case 168 /* TupleType */:
+                case 166 /* TypeLiteral */:
+                case 161 /* TypePredicate */:
+                case 148 /* TypeParameter */:
+                case 119 /* AnyKeyword */:
+                case 142 /* UnknownKeyword */:
+                case 122 /* BooleanKeyword */:
+                case 137 /* StringKeyword */:
+                case 134 /* NumberKeyword */:
+                case 131 /* NeverKeyword */:
+                case 105 /* VoidKeyword */:
+                case 138 /* SymbolKeyword */:
+                case 164 /* ConstructorType */:
+                case 163 /* FunctionType */:
+                case 165 /* TypeQuery */:
+                case 162 /* TypeReference */:
+                case 169 /* UnionType */:
+                case 170 /* IntersectionType */:
+                case 171 /* ConditionalType */:
+                case 173 /* ParenthesizedType */:
+                case 174 /* ThisType */:
+                case 175 /* TypeOperator */:
+                case 176 /* IndexedAccessType */:
+                case 177 /* MappedType */:
+                case 178 /* LiteralType */:
+                // TypeScript type nodes are elided.
+                case 160 /* IndexSignature */:
+                // TypeScript index signatures are elided.
+                case 150 /* Decorator */:
+                // TypeScript decorators are elided. They will be emitted as part of visitClassDeclaration.
+                case 237 /* TypeAliasDeclaration */:
+                    // TypeScript type-only declarations are elided.
                     return undefined;
-                case 152:
+                case 152 /* PropertyDeclaration */:
+                    // TypeScript property declarations are elided. However their names are still visited, and can potentially be retained if they could have sideeffects
                     return visitPropertyDeclaration(node);
-                case 242:
+                case 242 /* NamespaceExportDeclaration */:
+                    // TypeScript namespace export declarations are elided.
                     return undefined;
-                case 155:
+                case 155 /* Constructor */:
                     return visitConstructor(node);
-                case 236:
+                case 236 /* InterfaceDeclaration */:
+                    // TypeScript interfaces are elided, but some comments may be preserved.
+                    // See the implementation of `getLeadingComments` in comments.ts for more details.
                     return ts.createNotEmittedStatement(node);
-                case 235:
+                case 235 /* ClassDeclaration */:
+                    // This is a class declaration with TypeScript syntax extensions.
+                    //
+                    // TypeScript class syntax extensions include:
+                    // - decorators
+                    // - optional `implements` heritage clause
+                    // - parameter property assignments in the constructor
+                    // - property declarations
+                    // - index signatures
+                    // - method overload signatures
                     return visitClassDeclaration(node);
-                case 205:
+                case 205 /* ClassExpression */:
+                    // This is a class expression with TypeScript syntax extensions.
+                    //
+                    // TypeScript class syntax extensions include:
+                    // - decorators
+                    // - optional `implements` heritage clause
+                    // - parameter property assignments in the constructor
+                    // - property declarations
+                    // - index signatures
+                    // - method overload signatures
                     return visitClassExpression(node);
-                case 268:
+                case 268 /* HeritageClause */:
+                    // This is a heritage clause with TypeScript syntax extensions.
+                    //
+                    // TypeScript heritage clause extensions include:
+                    // - `implements` clause
                     return visitHeritageClause(node);
-                case 207:
+                case 207 /* ExpressionWithTypeArguments */:
+                    // TypeScript supports type arguments on an expression in an `extends` heritage clause.
                     return visitExpressionWithTypeArguments(node);
-                case 154:
+                case 154 /* MethodDeclaration */:
+                    // TypeScript method declarations may have decorators, modifiers
+                    // or type annotations.
                     return visitMethodDeclaration(node);
-                case 156:
+                case 156 /* GetAccessor */:
+                    // Get Accessors can have TypeScript modifiers, decorators, and type annotations.
                     return visitGetAccessor(node);
-                case 157:
+                case 157 /* SetAccessor */:
+                    // Set Accessors can have TypeScript modifiers and type annotations.
                     return visitSetAccessor(node);
-                case 234:
+                case 234 /* FunctionDeclaration */:
+                    // Typescript function declarations can have modifiers, decorators, and type annotations.
                     return visitFunctionDeclaration(node);
-                case 192:
+                case 192 /* FunctionExpression */:
+                    // TypeScript function expressions can have modifiers and type annotations.
                     return visitFunctionExpression(node);
-                case 193:
+                case 193 /* ArrowFunction */:
+                    // TypeScript arrow functions can have modifiers and type annotations.
                     return visitArrowFunction(node);
-                case 149:
+                case 149 /* Parameter */:
+                    // This is a parameter declaration with TypeScript syntax extensions.
+                    //
+                    // TypeScript parameter declaration syntax extensions include:
+                    // - decorators
+                    // - accessibility modifiers
+                    // - the question mark (?) token for optional parameters
+                    // - type annotations
+                    // - this parameters
                     return visitParameter(node);
-                case 191:
+                case 191 /* ParenthesizedExpression */:
+                    // ParenthesizedExpressions are TypeScript if their expression is a
+                    // TypeAssertion or AsExpression
                     return visitParenthesizedExpression(node);
-                case 190:
-                case 208:
+                case 190 /* TypeAssertionExpression */:
+                case 208 /* AsExpression */:
+                    // TypeScript type assertions are removed, but their subtrees are preserved.
                     return visitAssertionExpression(node);
-                case 187:
+                case 187 /* CallExpression */:
                     return visitCallExpression(node);
-                case 188:
+                case 188 /* NewExpression */:
                     return visitNewExpression(node);
-                case 189:
+                case 189 /* TaggedTemplateExpression */:
                     return visitTaggedTemplateExpression(node);
-                case 209:
+                case 209 /* NonNullExpression */:
+                    // TypeScript non-null expressions are removed, but their subtrees are preserved.
                     return visitNonNullExpression(node);
-                case 238:
+                case 238 /* EnumDeclaration */:
+                    // TypeScript enum declarations do not exist in ES6 and must be rewritten.
                     return visitEnumDeclaration(node);
-                case 214:
+                case 214 /* VariableStatement */:
+                    // TypeScript namespace exports for variable statements must be transformed.
                     return visitVariableStatement(node);
-                case 232:
+                case 232 /* VariableDeclaration */:
                     return visitVariableDeclaration(node);
-                case 239:
+                case 239 /* ModuleDeclaration */:
+                    // TypeScript namespace declarations must be transformed.
                     return visitModuleDeclaration(node);
-                case 243:
+                case 243 /* ImportEqualsDeclaration */:
+                    // TypeScript namespace or external module import.
                     return visitImportEqualsDeclaration(node);
                 default:
                     return ts.Debug.failBadSyntaxKind(node);
@@ -49234,8 +61515,11 @@ var ts;
             var alwaysStrict = ts.getStrictOptionValue(compilerOptions, "alwaysStrict") &&
                 !(ts.isExternalModule(node) && moduleKind >= ts.ModuleKind.ES2015) &&
                 !ts.isJsonSourceFile(node);
-            return ts.updateSourceFileNode(node, ts.visitLexicalEnvironment(node.statements, sourceElementVisitor, context, 0, alwaysStrict));
+            return ts.updateSourceFileNode(node, ts.visitLexicalEnvironment(node.statements, sourceElementVisitor, context, /*start*/ 0, alwaysStrict));
         }
+        /**
+         * Tests whether we should emit a __decorate call for a class declaration.
+         */
         function shouldEmitDecorateCallForClass(node) {
             if (node.decorators && node.decorators.length > 0) {
                 return true;
@@ -49246,68 +61530,104 @@ var ts;
             }
             return false;
         }
+        /**
+         * Tests whether we should emit a __decorate call for a parameter declaration.
+         */
         function shouldEmitDecorateCallForParameter(parameter) {
             return parameter.decorators !== undefined && parameter.decorators.length > 0;
         }
         function getClassFacts(node, staticProperties) {
-            var facts = 0;
+            var facts = 0 /* None */;
             if (ts.some(staticProperties))
-                facts |= 1;
+                facts |= 1 /* HasStaticInitializedProperties */;
             var extendsClauseElement = ts.getClassExtendsHeritageClauseElement(node);
-            if (extendsClauseElement && ts.skipOuterExpressions(extendsClauseElement.expression).kind !== 95)
-                facts |= 64;
+            if (extendsClauseElement && ts.skipOuterExpressions(extendsClauseElement.expression).kind !== 95 /* NullKeyword */)
+                facts |= 64 /* IsDerivedClass */;
             if (shouldEmitDecorateCallForClass(node))
-                facts |= 2;
+                facts |= 2 /* HasConstructorDecorators */;
             if (ts.childIsDecorated(node))
-                facts |= 4;
+                facts |= 4 /* HasMemberDecorators */;
             if (isExportOfNamespace(node))
-                facts |= 8;
+                facts |= 8 /* IsExportOfNamespace */;
             else if (isDefaultExternalModuleExport(node))
-                facts |= 32;
+                facts |= 32 /* IsDefaultExternalExport */;
             else if (isNamedExternalModuleExport(node))
-                facts |= 16;
-            if (languageVersion <= 1 && (facts & 7))
-                facts |= 128;
+                facts |= 16 /* IsNamedExternalExport */;
+            if (languageVersion <= 1 /* ES5 */ && (facts & 7 /* MayNeedImmediatelyInvokedFunctionExpression */))
+                facts |= 128 /* UseImmediatelyInvokedFunctionExpression */;
             return facts;
         }
+        /**
+         * Transforms a class declaration with TypeScript syntax into compatible ES6.
+         *
+         * This function will only be called when one of the following conditions are met:
+         * - The class has decorators.
+         * - The class has property declarations with initializers.
+         * - The class contains a constructor that contains parameters with accessibility modifiers.
+         * - The class is an export in a TypeScript namespace.
+         *
+         * @param node The node to transform.
+         */
         function visitClassDeclaration(node) {
             var savedPendingExpressions = pendingExpressions;
             pendingExpressions = undefined;
-            var staticProperties = getInitializedProperties(node, true);
+            var staticProperties = getInitializedProperties(node, /*isStatic*/ true);
             var facts = getClassFacts(node, staticProperties);
-            if (facts & 128) {
+            if (facts & 128 /* UseImmediatelyInvokedFunctionExpression */) {
                 context.startLexicalEnvironment();
             }
-            var name = node.name || (facts & 5 ? ts.getGeneratedNameForNode(node) : undefined);
-            var classStatement = facts & 2
+            var name = node.name || (facts & 5 /* NeedsName */ ? ts.getGeneratedNameForNode(node) : undefined);
+            var classStatement = facts & 2 /* HasConstructorDecorators */
                 ? createClassDeclarationHeadWithDecorators(node, name, facts)
                 : createClassDeclarationHeadWithoutDecorators(node, name, facts);
             var statements = [classStatement];
+            // Write any pending expressions from elided or moved computed property names
             if (ts.some(pendingExpressions)) {
                 statements.push(ts.createStatement(ts.inlineExpressions(pendingExpressions)));
             }
             pendingExpressions = savedPendingExpressions;
-            if (facts & 1) {
-                addInitializedPropertyStatements(statements, staticProperties, facts & 128 ? ts.getInternalName(node) : ts.getLocalName(node));
+            // Emit static property assignment. Because classDeclaration is lexically evaluated,
+            // it is safe to emit static property assignment after classDeclaration
+            // From ES6 specification:
+            //      HasLexicalDeclaration (N) : Determines if the argument identifier has a binding in this environment record that was created using
+            //                                  a lexical declaration such as a LexicalDeclaration or a ClassDeclaration.
+            if (facts & 1 /* HasStaticInitializedProperties */) {
+                addInitializedPropertyStatements(statements, staticProperties, facts & 128 /* UseImmediatelyInvokedFunctionExpression */ ? ts.getInternalName(node) : ts.getLocalName(node));
             }
-            addClassElementDecorationStatements(statements, node, false);
-            addClassElementDecorationStatements(statements, node, true);
+            // Write any decorators of the node.
+            addClassElementDecorationStatements(statements, node, /*isStatic*/ false);
+            addClassElementDecorationStatements(statements, node, /*isStatic*/ true);
             addConstructorDecorationStatement(statements, node);
-            if (facts & 128) {
-                var closingBraceLocation = ts.createTokenRange(ts.skipTrivia(currentSourceFile.text, node.members.end), 18);
+            if (facts & 128 /* UseImmediatelyInvokedFunctionExpression */) {
+                // When we emit a TypeScript class down to ES5, we must wrap it in an IIFE so that the
+                // 'es2015' transformer can properly nest static initializers and decorators. The result
+                // looks something like:
+                //
+                //  var C = function () {
+                //      class C {
+                //      }
+                //      C.static_prop = 1;
+                //      return C;
+                //  }();
+                //
+                var closingBraceLocation = ts.createTokenRange(ts.skipTrivia(currentSourceFile.text, node.members.end), 18 /* CloseBraceToken */);
                 var localName = ts.getInternalName(node);
+                // The following partially-emitted expression exists purely to align our sourcemap
+                // emit with the original emitter.
                 var outer = ts.createPartiallyEmittedExpression(localName);
                 outer.end = closingBraceLocation.end;
-                ts.setEmitFlags(outer, 1536);
+                ts.setEmitFlags(outer, 1536 /* NoComments */);
                 var statement = ts.createReturn(outer);
                 statement.pos = closingBraceLocation.pos;
-                ts.setEmitFlags(statement, 1536 | 384);
+                ts.setEmitFlags(statement, 1536 /* NoComments */ | 384 /* NoTokenSourceMaps */);
                 statements.push(statement);
                 ts.prependStatements(statements, context.endLexicalEnvironment());
                 var iife = ts.createImmediatelyInvokedArrowFunction(statements);
-                ts.setEmitFlags(iife, 33554432);
-                var varStatement = ts.createVariableStatement(undefined, ts.createVariableDeclarationList([
-                    ts.createVariableDeclaration(ts.getLocalName(node, false, false), undefined, iife)
+                ts.setEmitFlags(iife, 33554432 /* TypeScriptClassWrapper */);
+                var varStatement = ts.createVariableStatement(
+                /*modifiers*/ undefined, ts.createVariableDeclarationList([
+                    ts.createVariableDeclaration(ts.getLocalName(node, /*allowComments*/ false, /*allowSourceMaps*/ false), 
+                    /*type*/ undefined, iife)
                 ]));
                 ts.setOriginalNode(varStatement, node);
                 ts.setCommentRange(varStatement, node);
@@ -49315,75 +61635,205 @@ var ts;
                 ts.startOnNewLine(varStatement);
                 statements = [varStatement];
             }
-            if (facts & 8) {
+            // If the class is exported as part of a TypeScript namespace, emit the namespace export.
+            // Otherwise, if the class was exported at the top level and was decorated, emit an export
+            // declaration or export default for the class.
+            if (facts & 8 /* IsExportOfNamespace */) {
                 addExportMemberAssignment(statements, node);
             }
-            else if (facts & 128 || facts & 2) {
-                if (facts & 32) {
-                    statements.push(ts.createExportDefault(ts.getLocalName(node, false, true)));
+            else if (facts & 128 /* UseImmediatelyInvokedFunctionExpression */ || facts & 2 /* HasConstructorDecorators */) {
+                if (facts & 32 /* IsDefaultExternalExport */) {
+                    statements.push(ts.createExportDefault(ts.getLocalName(node, /*allowComments*/ false, /*allowSourceMaps*/ true)));
                 }
-                else if (facts & 16) {
-                    statements.push(ts.createExternalModuleExport(ts.getLocalName(node, false, true)));
+                else if (facts & 16 /* IsNamedExternalExport */) {
+                    statements.push(ts.createExternalModuleExport(ts.getLocalName(node, /*allowComments*/ false, /*allowSourceMaps*/ true)));
                 }
             }
             if (statements.length > 1) {
+                // Add a DeclarationMarker as a marker for the end of the declaration
                 statements.push(ts.createEndOfDeclarationMarker(node));
-                ts.setEmitFlags(classStatement, ts.getEmitFlags(classStatement) | 4194304);
+                ts.setEmitFlags(classStatement, ts.getEmitFlags(classStatement) | 4194304 /* HasEndOfDeclarationMarker */);
             }
             return ts.singleOrMany(statements);
         }
+        /**
+         * Transforms a non-decorated class declaration and appends the resulting statements.
+         *
+         * @param node A ClassDeclaration node.
+         * @param name The name of the class.
+         * @param facts Precomputed facts about the class.
+         */
         function createClassDeclarationHeadWithoutDecorators(node, name, facts) {
-            var modifiers = !(facts & 128)
+            //  ${modifiers} class ${name} ${heritageClauses} {
+            //      ${members}
+            //  }
+            // we do not emit modifiers on the declaration if we are emitting an IIFE
+            var modifiers = !(facts & 128 /* UseImmediatelyInvokedFunctionExpression */)
                 ? ts.visitNodes(node.modifiers, modifierVisitor, ts.isModifier)
                 : undefined;
-            var classDeclaration = ts.createClassDeclaration(undefined, modifiers, name, undefined, ts.visitNodes(node.heritageClauses, visitor, ts.isHeritageClause), transformClassMembers(node, (facts & 64) !== 0));
+            var classDeclaration = ts.createClassDeclaration(
+            /*decorators*/ undefined, modifiers, name, 
+            /*typeParameters*/ undefined, ts.visitNodes(node.heritageClauses, visitor, ts.isHeritageClause), transformClassMembers(node, (facts & 64 /* IsDerivedClass */) !== 0));
+            // To better align with the old emitter, we should not emit a trailing source map
+            // entry if the class has static properties.
             var emitFlags = ts.getEmitFlags(node);
-            if (facts & 1) {
-                emitFlags |= 32;
+            if (facts & 1 /* HasStaticInitializedProperties */) {
+                emitFlags |= 32 /* NoTrailingSourceMap */;
             }
             ts.setTextRange(classDeclaration, node);
             ts.setOriginalNode(classDeclaration, node);
             ts.setEmitFlags(classDeclaration, emitFlags);
             return classDeclaration;
         }
+        /**
+         * Transforms a decorated class declaration and appends the resulting statements. If
+         * the class requires an alias to avoid issues with double-binding, the alias is returned.
+         */
         function createClassDeclarationHeadWithDecorators(node, name, facts) {
+            // When we emit an ES6 class that has a class decorator, we must tailor the
+            // emit to certain specific cases.
+            //
+            // In the simplest case, we emit the class declaration as a let declaration, and
+            // evaluate decorators after the close of the class body:
+            //
+            //  [Example 1]
+            //  ---------------------------------------------------------------------
+            //  TypeScript                      | Javascript
+            //  ---------------------------------------------------------------------
+            //  @dec                            | let C = class C {
+            //  class C {                       | }
+            //  }                               | C = __decorate([dec], C);
+            //  ---------------------------------------------------------------------
+            //  @dec                            | let C = class C {
+            //  export class C {                | }
+            //  }                               | C = __decorate([dec], C);
+            //                                  | export { C };
+            //  ---------------------------------------------------------------------
+            //
+            // If a class declaration contains a reference to itself *inside* of the class body,
+            // this introduces two bindings to the class: One outside of the class body, and one
+            // inside of the class body. If we apply decorators as in [Example 1] above, there
+            // is the possibility that the decorator `dec` will return a new value for the
+            // constructor, which would result in the binding inside of the class no longer
+            // pointing to the same reference as the binding outside of the class.
+            //
+            // As a result, we must instead rewrite all references to the class *inside* of the
+            // class body to instead point to a local temporary alias for the class:
+            //
+            //  [Example 2]
+            //  ---------------------------------------------------------------------
+            //  TypeScript                      | Javascript
+            //  ---------------------------------------------------------------------
+            //  @dec                            | let C = C_1 = class C {
+            //  class C {                       |   static x() { return C_1.y; }
+            //    static x() { return C.y; }    | }
+            //    static y = 1;                 | C.y = 1;
+            //  }                               | C = C_1 = __decorate([dec], C);
+            //                                  | var C_1;
+            //  ---------------------------------------------------------------------
+            //  @dec                            | let C = class C {
+            //  export class C {                |   static x() { return C_1.y; }
+            //    static x() { return C.y; }    | }
+            //    static y = 1;                 | C.y = 1;
+            //  }                               | C = C_1 = __decorate([dec], C);
+            //                                  | export { C };
+            //                                  | var C_1;
+            //  ---------------------------------------------------------------------
+            //
+            // If a class declaration is the default export of a module, we instead emit
+            // the export after the decorated declaration:
+            //
+            //  [Example 3]
+            //  ---------------------------------------------------------------------
+            //  TypeScript                      | Javascript
+            //  ---------------------------------------------------------------------
+            //  @dec                            | let default_1 = class {
+            //  export default class {          | }
+            //  }                               | default_1 = __decorate([dec], default_1);
+            //                                  | export default default_1;
+            //  ---------------------------------------------------------------------
+            //  @dec                            | let C = class C {
+            //  export default class C {        | }
+            //  }                               | C = __decorate([dec], C);
+            //                                  | export default C;
+            //  ---------------------------------------------------------------------
+            //
+            // If the class declaration is the default export and a reference to itself
+            // inside of the class body, we must emit both an alias for the class *and*
+            // move the export after the declaration:
+            //
+            //  [Example 4]
+            //  ---------------------------------------------------------------------
+            //  TypeScript                      | Javascript
+            //  ---------------------------------------------------------------------
+            //  @dec                            | let C = class C {
+            //  export default class C {        |   static x() { return C_1.y; }
+            //    static x() { return C.y; }    | }
+            //    static y = 1;                 | C.y = 1;
+            //  }                               | C = C_1 = __decorate([dec], C);
+            //                                  | export default C;
+            //                                  | var C_1;
+            //  ---------------------------------------------------------------------
+            //
             var location = ts.moveRangePastDecorators(node);
             var classAlias = getClassAliasIfNeeded(node);
-            var declName = ts.getLocalName(node, false, true);
+            var declName = ts.getLocalName(node, /*allowComments*/ false, /*allowSourceMaps*/ true);
+            //  ... = class ${name} ${heritageClauses} {
+            //      ${members}
+            //  }
             var heritageClauses = ts.visitNodes(node.heritageClauses, visitor, ts.isHeritageClause);
-            var members = transformClassMembers(node, (facts & 64) !== 0);
-            var classExpression = ts.createClassExpression(undefined, name, undefined, heritageClauses, members);
+            var members = transformClassMembers(node, (facts & 64 /* IsDerivedClass */) !== 0);
+            var classExpression = ts.createClassExpression(/*modifiers*/ undefined, name, /*typeParameters*/ undefined, heritageClauses, members);
             ts.setOriginalNode(classExpression, node);
             ts.setTextRange(classExpression, location);
-            var statement = ts.createVariableStatement(undefined, ts.createVariableDeclarationList([
-                ts.createVariableDeclaration(declName, undefined, classAlias ? ts.createAssignment(classAlias, classExpression) : classExpression)
-            ], 1));
+            //  let ${name} = ${classExpression} where name is either declaredName if the class doesn't contain self-reference
+            //                                         or decoratedClassAlias if the class contain self-reference.
+            var statement = ts.createVariableStatement(
+            /*modifiers*/ undefined, ts.createVariableDeclarationList([
+                ts.createVariableDeclaration(declName, 
+                /*type*/ undefined, classAlias ? ts.createAssignment(classAlias, classExpression) : classExpression)
+            ], 1 /* Let */));
             ts.setOriginalNode(statement, node);
             ts.setTextRange(statement, location);
             ts.setCommentRange(statement, node);
             return statement;
         }
+        /**
+         * Transforms a class expression with TypeScript syntax into compatible ES6.
+         *
+         * This function will only be called when one of the following conditions are met:
+         * - The class has property declarations with initializers.
+         * - The class contains a constructor that contains parameters with accessibility modifiers.
+         *
+         * @param node The node to transform.
+         */
         function visitClassExpression(node) {
             var savedPendingExpressions = pendingExpressions;
             pendingExpressions = undefined;
-            var staticProperties = getInitializedProperties(node, true);
+            var staticProperties = getInitializedProperties(node, /*isStatic*/ true);
             var heritageClauses = ts.visitNodes(node.heritageClauses, visitor, ts.isHeritageClause);
-            var members = transformClassMembers(node, ts.some(heritageClauses, function (c) { return c.token === 85; }));
-            var classExpression = ts.createClassExpression(undefined, node.name, undefined, heritageClauses, members);
+            var members = transformClassMembers(node, ts.some(heritageClauses, function (c) { return c.token === 85 /* ExtendsKeyword */; }));
+            var classExpression = ts.createClassExpression(
+            /*modifiers*/ undefined, node.name, 
+            /*typeParameters*/ undefined, heritageClauses, members);
             ts.setOriginalNode(classExpression, node);
             ts.setTextRange(classExpression, node);
             if (ts.some(staticProperties) || ts.some(pendingExpressions)) {
                 var expressions = [];
-                var isClassWithConstructorReference = resolver.getNodeCheckFlags(node) & 8388608;
+                var isClassWithConstructorReference = resolver.getNodeCheckFlags(node) & 8388608 /* ClassWithConstructorReference */;
                 var temp = ts.createTempVariable(hoistVariableDeclaration, !!isClassWithConstructorReference);
                 if (isClassWithConstructorReference) {
+                    // record an alias as the class name is not in scope for statics.
                     enableSubstitutionForClassAliases();
                     var alias = ts.getSynthesizedClone(temp);
-                    alias.autoGenerateFlags &= ~8;
+                    alias.autoGenerateFlags &= ~8 /* ReservedInNestedScopes */;
                     classAliases[ts.getOriginalNodeId(node)] = alias;
                 }
-                ts.setEmitFlags(classExpression, 65536 | ts.getEmitFlags(classExpression));
+                // To preserve the behavior of the old emitter, we explicitly indent
+                // the body of a class with static initializers.
+                ts.setEmitFlags(classExpression, 65536 /* Indented */ | ts.getEmitFlags(classExpression));
                 expressions.push(ts.startOnNewLine(ts.createAssignment(temp, classExpression)));
+                // Add any pending expressions leftover from elided or relocated computed property names
                 ts.addRange(expressions, ts.map(pendingExpressions, ts.startOnNewLine));
                 pendingExpressions = savedPendingExpressions;
                 ts.addRange(expressions, generateInitializedPropertyExpressions(staticProperties, temp));
@@ -49393,6 +61843,12 @@ var ts;
             pendingExpressions = savedPendingExpressions;
             return classExpression;
         }
+        /**
+         * Transforms the members of a class.
+         *
+         * @param node The current class.
+         * @param isDerivedClass A value indicating whether the class has an extends clause that does not extend 'null'.
+         */
         function transformClassMembers(node, isDerivedClass) {
             var members = [];
             var constructor = transformConstructor(node, isDerivedClass);
@@ -49400,52 +61856,137 @@ var ts;
                 members.push(constructor);
             }
             ts.addRange(members, ts.visitNodes(node.members, classElementVisitor, ts.isClassElement));
-            return ts.setTextRange(ts.createNodeArray(members), node.members);
+            return ts.setTextRange(ts.createNodeArray(members), /*location*/ node.members);
         }
+        /**
+         * Transforms (or creates) a constructor for a class.
+         *
+         * @param node The current class.
+         * @param isDerivedClass A value indicating whether the class has an extends clause that does not extend 'null'.
+         */
         function transformConstructor(node, isDerivedClass) {
+            // Check if we have property assignment inside class declaration.
+            // If there is a property assignment, we need to emit constructor whether users define it or not
+            // If there is no property assignment, we can omit constructor if users do not define it
             var hasInstancePropertyWithInitializer = ts.forEach(node.members, isInstanceInitializedProperty);
-            var hasParameterPropertyAssignments = node.transformFlags & 262144;
+            var hasParameterPropertyAssignments = node.transformFlags & 262144 /* ContainsParameterPropertyAssignments */;
             var constructor = ts.getFirstConstructorWithBody(node);
+            // If the class does not contain nodes that require a synthesized constructor,
+            // accept the current constructor if it exists.
             if (!hasInstancePropertyWithInitializer && !hasParameterPropertyAssignments) {
                 return ts.visitEachChild(constructor, visitor, context);
             }
             var parameters = transformConstructorParameters(constructor);
             var body = transformConstructorBody(node, constructor, isDerivedClass);
-            return ts.startOnNewLine(ts.setOriginalNode(ts.setTextRange(ts.createConstructor(undefined, undefined, parameters, body), constructor || node), constructor));
+            //  constructor(${parameters}) {
+            //      ${body}
+            //  }
+            return ts.startOnNewLine(ts.setOriginalNode(ts.setTextRange(ts.createConstructor(
+            /*decorators*/ undefined, 
+            /*modifiers*/ undefined, parameters, body), constructor || node), constructor));
         }
+        /**
+         * Transforms (or creates) the parameters for the constructor of a class with
+         * parameter property assignments or instance property initializers.
+         *
+         * @param constructor The constructor declaration.
+         */
         function transformConstructorParameters(constructor) {
+            // The ES2015 spec specifies in 14.5.14. Runtime Semantics: ClassDefinitionEvaluation:
+            // If constructor is empty, then
+            //     If ClassHeritag_eopt is present and protoParent is not null, then
+            //          Let constructor be the result of parsing the source text
+            //              constructor(...args) { super (...args);}
+            //          using the syntactic grammar with the goal symbol MethodDefinition[~Yield].
+            //      Else,
+            //           Let constructor be the result of parsing the source text
+            //               constructor( ){ }
+            //           using the syntactic grammar with the goal symbol MethodDefinition[~Yield].
+            //
+            // While we could emit the '...args' rest parameter, certain later tools in the pipeline might
+            // downlevel the '...args' portion less efficiently by naively copying the contents of 'arguments' to an array.
+            // Instead, we'll avoid using a rest parameter and spread into the super call as
+            // 'super(...arguments)' instead of 'super(...args)', as you can see in "transformConstructorBody".
             return ts.visitParameterList(constructor && constructor.parameters, visitor, context)
                 || [];
         }
+        /**
+         * Transforms (or creates) a constructor body for a class with parameter property
+         * assignments or instance property initializers.
+         *
+         * @param node The current class.
+         * @param constructor The current class constructor.
+         * @param isDerivedClass A value indicating whether the class has an extends clause that does not extend 'null'.
+         */
         function transformConstructorBody(node, constructor, isDerivedClass) {
             var statements = [];
             var indexOfFirstStatement = 0;
             resumeLexicalEnvironment();
             if (constructor) {
                 indexOfFirstStatement = addPrologueDirectivesAndInitialSuperCall(constructor, statements);
+                // Add parameters with property assignments. Transforms this:
+                //
+                //  constructor (public x, public y) {
+                //  }
+                //
+                // Into this:
+                //
+                //  constructor (x, y) {
+                //      this.x = x;
+                //      this.y = y;
+                //  }
+                //
                 var propertyAssignments = getParametersWithPropertyAssignments(constructor);
                 ts.addRange(statements, ts.map(propertyAssignments, transformParameterWithPropertyAssignment));
             }
             else if (isDerivedClass) {
-                statements.push(ts.createStatement(ts.createCall(ts.createSuper(), undefined, [ts.createSpread(ts.createIdentifier("arguments"))])));
+                // Add a synthetic `super` call:
+                //
+                //  super(...arguments);
+                //
+                statements.push(ts.createStatement(ts.createCall(ts.createSuper(), 
+                /*typeArguments*/ undefined, [ts.createSpread(ts.createIdentifier("arguments"))])));
             }
-            var properties = getInitializedProperties(node, false);
+            // Add the property initializers. Transforms this:
+            //
+            //  public x = 1;
+            //
+            // Into this:
+            //
+            //  constructor() {
+            //      this.x = 1;
+            //  }
+            //
+            var properties = getInitializedProperties(node, /*isStatic*/ false);
             addInitializedPropertyStatements(statements, properties, ts.createThis());
             if (constructor) {
+                // The class already had a constructor, so we should add the existing statements, skipping the initial super call.
                 ts.addRange(statements, ts.visitNodes(constructor.body.statements, visitor, ts.isStatement, indexOfFirstStatement));
             }
+            // End the lexical environment.
             statements = ts.mergeLexicalEnvironment(statements, endLexicalEnvironment());
-            return ts.setTextRange(ts.createBlock(ts.setTextRange(ts.createNodeArray(statements), constructor ? constructor.body.statements : node.members), true), constructor ? constructor.body : undefined);
+            return ts.setTextRange(ts.createBlock(ts.setTextRange(ts.createNodeArray(statements), 
+            /*location*/ constructor ? constructor.body.statements : node.members), 
+            /*multiLine*/ true), 
+            /*location*/ constructor ? constructor.body : undefined);
         }
+        /**
+         * Adds super call and preceding prologue directives into the list of statements.
+         *
+         * @param ctor The constructor node.
+         * @returns index of the statement that follows super call
+         */
         function addPrologueDirectivesAndInitialSuperCall(ctor, result) {
             if (ctor.body) {
                 var statements = ctor.body.statements;
-                var index = ts.addPrologue(result, statements, false, visitor);
+                // add prologue directives to the list (if any)
+                var index = ts.addPrologue(result, statements, /*ensureUseStrict*/ false, visitor);
                 if (index === statements.length) {
+                    // list contains nothing but prologue directives (or empty) - exit
                     return index;
                 }
                 var statement = statements[index];
-                if (statement.kind === 216 && ts.isSuperCall(statement.expression)) {
+                if (statement.kind === 216 /* ExpressionStatement */ && ts.isSuperCall(statement.expression)) {
                     result.push(ts.visitNode(statement, visitor, ts.isStatement));
                     return index + 1;
                 }
@@ -49453,36 +61994,79 @@ var ts;
             }
             return 0;
         }
+        /**
+         * Gets all parameters of a constructor that should be transformed into property assignments.
+         *
+         * @param node The constructor node.
+         */
         function getParametersWithPropertyAssignments(node) {
             return ts.filter(node.parameters, isParameterWithPropertyAssignment);
         }
+        /**
+         * Determines whether a parameter should be transformed into a property assignment.
+         *
+         * @param parameter The parameter node.
+         */
         function isParameterWithPropertyAssignment(parameter) {
-            return ts.hasModifier(parameter, 92)
+            return ts.hasModifier(parameter, 92 /* ParameterPropertyModifier */)
                 && ts.isIdentifier(parameter.name);
         }
+        /**
+         * Transforms a parameter into a property assignment statement.
+         *
+         * @param node The parameter declaration.
+         */
         function transformParameterWithPropertyAssignment(node) {
             ts.Debug.assert(ts.isIdentifier(node.name));
             var name = node.name;
             var propertyName = ts.getMutableClone(name);
-            ts.setEmitFlags(propertyName, 1536 | 48);
+            ts.setEmitFlags(propertyName, 1536 /* NoComments */ | 48 /* NoSourceMap */);
             var localName = ts.getMutableClone(name);
-            ts.setEmitFlags(localName, 1536);
-            return ts.startOnNewLine(ts.setEmitFlags(ts.setTextRange(ts.createStatement(ts.createAssignment(ts.setTextRange(ts.createPropertyAccess(ts.createThis(), propertyName), node.name), localName)), ts.moveRangePos(node, -1)), 1536));
+            ts.setEmitFlags(localName, 1536 /* NoComments */);
+            return ts.startOnNewLine(ts.setEmitFlags(ts.setTextRange(ts.createStatement(ts.createAssignment(ts.setTextRange(ts.createPropertyAccess(ts.createThis(), propertyName), node.name), localName)), ts.moveRangePos(node, -1)), 1536 /* NoComments */));
         }
+        /**
+         * Gets all property declarations with initializers on either the static or instance side of a class.
+         *
+         * @param node The class node.
+         * @param isStatic A value indicating whether to get properties from the static or instance side of the class.
+         */
         function getInitializedProperties(node, isStatic) {
             return ts.filter(node.members, isStatic ? isStaticInitializedProperty : isInstanceInitializedProperty);
         }
+        /**
+         * Gets a value indicating whether a class element is a static property declaration with an initializer.
+         *
+         * @param member The class element node.
+         */
         function isStaticInitializedProperty(member) {
-            return isInitializedProperty(member, true);
+            return isInitializedProperty(member, /*isStatic*/ true);
         }
+        /**
+         * Gets a value indicating whether a class element is an instance property declaration with an initializer.
+         *
+         * @param member The class element node.
+         */
         function isInstanceInitializedProperty(member) {
-            return isInitializedProperty(member, false);
+            return isInitializedProperty(member, /*isStatic*/ false);
         }
+        /**
+         * Gets a value indicating whether a class element is either a static or an instance property declaration with an initializer.
+         *
+         * @param member The class element node.
+         * @param isStatic A value indicating whether the member should be a static or instance member.
+         */
         function isInitializedProperty(member, isStatic) {
-            return member.kind === 152
-                && isStatic === ts.hasModifier(member, 32)
+            return member.kind === 152 /* PropertyDeclaration */
+                && isStatic === ts.hasModifier(member, 32 /* Static */)
                 && member.initializer !== undefined;
         }
+        /**
+         * Generates assignment statements for property initializers.
+         *
+         * @param properties An array of property declarations to transform.
+         * @param receiver The receiver on which each property should be assigned.
+         */
         function addInitializedPropertyStatements(statements, properties, receiver) {
             for (var _i = 0, properties_10 = properties; _i < properties_10.length; _i++) {
                 var property = properties_10[_i];
@@ -49492,6 +62076,12 @@ var ts;
                 statements.push(statement);
             }
         }
+        /**
+         * Generates assignment expressions for property initializers.
+         *
+         * @param properties An array of property declarations to transform.
+         * @param receiver The receiver on which each property should be assigned.
+         */
         function generateInitializedPropertyExpressions(properties, receiver) {
             var expressions = [];
             for (var _i = 0, properties_11 = properties; _i < properties_11.length; _i++) {
@@ -49504,27 +62094,66 @@ var ts;
             }
             return expressions;
         }
+        /**
+         * Transforms a property initializer into an assignment statement.
+         *
+         * @param property The property declaration.
+         * @param receiver The object receiving the property assignment.
+         */
         function transformInitializedProperty(property, receiver) {
+            // We generate a name here in order to reuse the value cached by the relocated computed name expression (which uses the same generated name)
             var propertyName = ts.isComputedPropertyName(property.name) && !isSimpleInlineableExpression(property.name.expression)
                 ? ts.updateComputedPropertyName(property.name, ts.getGeneratedNameForNode(property.name))
                 : property.name;
             var initializer = ts.visitNode(property.initializer, visitor, ts.isExpression);
-            var memberAccess = ts.createMemberAccessForPropertyName(receiver, propertyName, propertyName);
+            var memberAccess = ts.createMemberAccessForPropertyName(receiver, propertyName, /*location*/ propertyName);
             return ts.createAssignment(memberAccess, initializer);
         }
+        /**
+         * Gets either the static or instance members of a class that are decorated, or have
+         * parameters that are decorated.
+         *
+         * @param node The class containing the member.
+         * @param isStatic A value indicating whether to retrieve static or instance members of
+         *                 the class.
+         */
         function getDecoratedClassElements(node, isStatic) {
             return ts.filter(node.members, isStatic ? function (m) { return isStaticDecoratedClassElement(m, node); } : function (m) { return isInstanceDecoratedClassElement(m, node); });
         }
+        /**
+         * Determines whether a class member is a static member of a class that is decorated, or
+         * has parameters that are decorated.
+         *
+         * @param member The class member.
+         */
         function isStaticDecoratedClassElement(member, parent) {
-            return isDecoratedClassElement(member, true, parent);
+            return isDecoratedClassElement(member, /*isStatic*/ true, parent);
         }
+        /**
+         * Determines whether a class member is an instance member of a class that is decorated,
+         * or has parameters that are decorated.
+         *
+         * @param member The class member.
+         */
         function isInstanceDecoratedClassElement(member, parent) {
-            return isDecoratedClassElement(member, false, parent);
+            return isDecoratedClassElement(member, /*isStatic*/ false, parent);
         }
+        /**
+         * Determines whether a class member is either a static or an instance member of a class
+         * that is decorated, or has parameters that are decorated.
+         *
+         * @param member The class member.
+         */
         function isDecoratedClassElement(member, isStatic, parent) {
             return ts.nodeOrChildIsDecorated(member, parent)
-                && isStatic === ts.hasModifier(member, 32);
+                && isStatic === ts.hasModifier(member, 32 /* Static */);
         }
+        /**
+         * Gets an array of arrays of decorators for the parameters of a function-like node.
+         * The offset into the result array should correspond to the offset of the parameter.
+         *
+         * @param node The function-like node.
+         */
         function getDecoratorsOfParameters(node) {
             var decorators;
             if (node) {
@@ -49541,6 +62170,12 @@ var ts;
             }
             return decorators;
         }
+        /**
+         * Gets an AllDecorators object containing the decorators for the class and the decorators for the
+         * parameters of the constructor of the class.
+         *
+         * @param node The class node.
+         */
         function getAllDecoratorsOfConstructor(node) {
             var decorators = node.decorators;
             var parameters = getDecoratorsOfParameters(ts.getFirstConstructorWithBody(node));
@@ -49552,19 +62187,31 @@ var ts;
                 parameters: parameters
             };
         }
+        /**
+         * Gets an AllDecorators object containing the decorators for the member and its parameters.
+         *
+         * @param node The class node that contains the member.
+         * @param member The class member.
+         */
         function getAllDecoratorsOfClassElement(node, member) {
             switch (member.kind) {
-                case 156:
-                case 157:
+                case 156 /* GetAccessor */:
+                case 157 /* SetAccessor */:
                     return getAllDecoratorsOfAccessors(node, member);
-                case 154:
+                case 154 /* MethodDeclaration */:
                     return getAllDecoratorsOfMethod(member);
-                case 152:
+                case 152 /* PropertyDeclaration */:
                     return getAllDecoratorsOfProperty(member);
                 default:
                     return undefined;
             }
         }
+        /**
+         * Gets an AllDecorators object containing the decorators for the accessor and its parameters.
+         *
+         * @param node The class node that contains the accessor.
+         * @param accessor The class accessor member.
+         */
         function getAllDecoratorsOfAccessors(node, accessor) {
             if (!accessor.body) {
                 return undefined;
@@ -49581,6 +62228,11 @@ var ts;
             }
             return { decorators: decorators, parameters: parameters };
         }
+        /**
+         * Gets an AllDecorators object containing the decorators for the method and its parameters.
+         *
+         * @param method The class method member.
+         */
         function getAllDecoratorsOfMethod(method) {
             if (!method.body) {
                 return undefined;
@@ -49592,6 +62244,11 @@ var ts;
             }
             return { decorators: decorators, parameters: parameters };
         }
+        /**
+         * Gets an AllDecorators object containing the decorators for the property.
+         *
+         * @param property The class property member.
+         */
         function getAllDecoratorsOfProperty(property) {
             var decorators = property.decorators;
             if (!decorators) {
@@ -49599,6 +62256,12 @@ var ts;
             }
             return { decorators: decorators };
         }
+        /**
+         * Transforms all of the decorators for a declaration into an array of expressions.
+         *
+         * @param node The declaration node.
+         * @param allDecorators An object containing all of the decorators for the declaration.
+         */
         function transformAllDecoratorsOfDeclaration(node, container, allDecorators) {
             if (!allDecorators) {
                 return undefined;
@@ -49609,14 +62272,30 @@ var ts;
             addTypeMetadata(node, container, decoratorExpressions);
             return decoratorExpressions;
         }
+        /**
+         * Generates statements used to apply decorators to either the static or instance members
+         * of a class.
+         *
+         * @param node The class node.
+         * @param isStatic A value indicating whether to generate statements for static or
+         *                 instance members.
+         */
         function addClassElementDecorationStatements(statements, node, isStatic) {
             ts.addRange(statements, ts.map(generateClassElementDecorationExpressions(node, isStatic), expressionToStatement));
         }
+        /**
+         * Generates expressions used to apply decorators to either the static or instance members
+         * of a class.
+         *
+         * @param node The class node.
+         * @param isStatic A value indicating whether to generate expressions for static or
+         *                 instance members.
+         */
         function generateClassElementDecorationExpressions(node, isStatic) {
             var members = getDecoratedClassElements(node, isStatic);
             var expressions;
-            for (var _i = 0, members_5 = members; _i < members_5.length; _i++) {
-                var member = members_5[_i];
+            for (var _i = 0, members_4 = members; _i < members_4.length; _i++) {
+                var member = members_4[_i];
                 var expression = generateClassElementDecorationExpression(node, member);
                 if (expression) {
                     if (!expressions) {
@@ -49629,29 +62308,79 @@ var ts;
             }
             return expressions;
         }
+        /**
+         * Generates an expression used to evaluate class element decorators at runtime.
+         *
+         * @param node The class node that contains the member.
+         * @param member The class member.
+         */
         function generateClassElementDecorationExpression(node, member) {
             var allDecorators = getAllDecoratorsOfClassElement(node, member);
             var decoratorExpressions = transformAllDecoratorsOfDeclaration(member, node, allDecorators);
             if (!decoratorExpressions) {
                 return undefined;
             }
+            // Emit the call to __decorate. Given the following:
+            //
+            //   class C {
+            //     @dec method(@dec2 x) {}
+            //     @dec get accessor() {}
+            //     @dec prop;
+            //   }
+            //
+            // The emit for a method is:
+            //
+            //   __decorate([
+            //       dec,
+            //       __param(0, dec2),
+            //       __metadata("design:type", Function),
+            //       __metadata("design:paramtypes", [Object]),
+            //       __metadata("design:returntype", void 0)
+            //   ], C.prototype, "method", null);
+            //
+            // The emit for an accessor is:
+            //
+            //   __decorate([
+            //       dec
+            //   ], C.prototype, "accessor", null);
+            //
+            // The emit for a property is:
+            //
+            //   __decorate([
+            //       dec
+            //   ], C.prototype, "prop");
+            //
             var prefix = getClassMemberPrefix(node, member);
-            var memberName = getExpressionForPropertyName(member, true);
-            var descriptor = languageVersion > 0
-                ? member.kind === 152
+            var memberName = getExpressionForPropertyName(member, /*generateNameForComputedPropertyName*/ true);
+            var descriptor = languageVersion > 0 /* ES3 */
+                ? member.kind === 152 /* PropertyDeclaration */
+                    // We emit `void 0` here to indicate to `__decorate` that it can invoke `Object.defineProperty` directly, but that it
+                    // should not invoke `Object.getOwnPropertyDescriptor`.
                     ? ts.createVoidZero()
+                    // We emit `null` here to indicate to `__decorate` that it can invoke `Object.getOwnPropertyDescriptor` directly.
+                    // We have this extra argument here so that we can inject an explicit property descriptor at a later date.
                     : ts.createNull()
                 : undefined;
             var helper = createDecorateHelper(context, decoratorExpressions, prefix, memberName, descriptor, ts.moveRangePastDecorators(member));
-            ts.setEmitFlags(helper, 1536);
+            ts.setEmitFlags(helper, 1536 /* NoComments */);
             return helper;
         }
+        /**
+         * Generates a __decorate helper call for a class constructor.
+         *
+         * @param node The class node.
+         */
         function addConstructorDecorationStatement(statements, node) {
             var expression = generateConstructorDecorationExpression(node);
             if (expression) {
                 statements.push(ts.setOriginalNode(ts.createStatement(expression), node));
             }
         }
+        /**
+         * Generates a __decorate helper call for a class constructor.
+         *
+         * @param node The class node.
+         */
         function generateConstructorDecorationExpression(node) {
             var allDecorators = getAllDecoratorsOfConstructor(node);
             var decoratorExpressions = transformAllDecoratorsOfDeclaration(node, node, allDecorators);
@@ -49659,29 +62388,47 @@ var ts;
                 return undefined;
             }
             var classAlias = classAliases && classAliases[ts.getOriginalNodeId(node)];
-            var localName = ts.getLocalName(node, false, true);
+            var localName = ts.getLocalName(node, /*allowComments*/ false, /*allowSourceMaps*/ true);
             var decorate = createDecorateHelper(context, decoratorExpressions, localName);
             var expression = ts.createAssignment(localName, classAlias ? ts.createAssignment(classAlias, decorate) : decorate);
-            ts.setEmitFlags(expression, 1536);
+            ts.setEmitFlags(expression, 1536 /* NoComments */);
             ts.setSourceMapRange(expression, ts.moveRangePastDecorators(node));
             return expression;
         }
+        /**
+         * Transforms a decorator into an expression.
+         *
+         * @param decorator The decorator node.
+         */
         function transformDecorator(decorator) {
             return ts.visitNode(decorator.expression, visitor, ts.isExpression);
         }
+        /**
+         * Transforms the decorators of a parameter.
+         *
+         * @param decorators The decorators for the parameter at the provided offset.
+         * @param parameterOffset The offset of the parameter.
+         */
         function transformDecoratorsOfParameter(decorators, parameterOffset) {
             var expressions;
             if (decorators) {
                 expressions = [];
                 for (var _i = 0, decorators_1 = decorators; _i < decorators_1.length; _i++) {
                     var decorator = decorators_1[_i];
-                    var helper = createParamHelper(context, transformDecorator(decorator), parameterOffset, decorator.expression);
-                    ts.setEmitFlags(helper, 1536);
+                    var helper = createParamHelper(context, transformDecorator(decorator), parameterOffset, 
+                    /*location*/ decorator.expression);
+                    ts.setEmitFlags(helper, 1536 /* NoComments */);
                     expressions.push(helper);
                 }
             }
             return expressions;
         }
+        /**
+         * Adds optional type metadata for a declaration.
+         *
+         * @param node The declaration node.
+         * @param decoratorExpressions The destination array to which to add new decorator expressions.
+         */
         function addTypeMetadata(node, container, decoratorExpressions) {
             if (USE_NEW_TYPE_METADATA_FORMAT) {
                 addNewTypeMetadata(node, container, decoratorExpressions);
@@ -49707,57 +62454,88 @@ var ts;
             if (compilerOptions.emitDecoratorMetadata) {
                 var properties = void 0;
                 if (shouldAddTypeMetadata(node)) {
-                    (properties || (properties = [])).push(ts.createPropertyAssignment("type", ts.createArrowFunction(undefined, undefined, [], undefined, ts.createToken(36), serializeTypeOfNode(node))));
+                    (properties || (properties = [])).push(ts.createPropertyAssignment("type", ts.createArrowFunction(/*modifiers*/ undefined, /*typeParameters*/ undefined, [], /*type*/ undefined, ts.createToken(36 /* EqualsGreaterThanToken */), serializeTypeOfNode(node))));
                 }
                 if (shouldAddParamTypesMetadata(node)) {
-                    (properties || (properties = [])).push(ts.createPropertyAssignment("paramTypes", ts.createArrowFunction(undefined, undefined, [], undefined, ts.createToken(36), serializeParameterTypesOfNode(node, container))));
+                    (properties || (properties = [])).push(ts.createPropertyAssignment("paramTypes", ts.createArrowFunction(/*modifiers*/ undefined, /*typeParameters*/ undefined, [], /*type*/ undefined, ts.createToken(36 /* EqualsGreaterThanToken */), serializeParameterTypesOfNode(node, container))));
                 }
                 if (shouldAddReturnTypeMetadata(node)) {
-                    (properties || (properties = [])).push(ts.createPropertyAssignment("returnType", ts.createArrowFunction(undefined, undefined, [], undefined, ts.createToken(36), serializeReturnTypeOfNode(node))));
+                    (properties || (properties = [])).push(ts.createPropertyAssignment("returnType", ts.createArrowFunction(/*modifiers*/ undefined, /*typeParameters*/ undefined, [], /*type*/ undefined, ts.createToken(36 /* EqualsGreaterThanToken */), serializeReturnTypeOfNode(node))));
                 }
                 if (properties) {
-                    decoratorExpressions.push(createMetadataHelper(context, "design:typeinfo", ts.createObjectLiteral(properties, true)));
+                    decoratorExpressions.push(createMetadataHelper(context, "design:typeinfo", ts.createObjectLiteral(properties, /*multiLine*/ true)));
                 }
             }
         }
+        /**
+         * Determines whether to emit the "design:type" metadata based on the node's kind.
+         * The caller should have already tested whether the node has decorators and whether the
+         * emitDecoratorMetadata compiler option is set.
+         *
+         * @param node The node to test.
+         */
         function shouldAddTypeMetadata(node) {
             var kind = node.kind;
-            return kind === 154
-                || kind === 156
-                || kind === 157
-                || kind === 152;
+            return kind === 154 /* MethodDeclaration */
+                || kind === 156 /* GetAccessor */
+                || kind === 157 /* SetAccessor */
+                || kind === 152 /* PropertyDeclaration */;
         }
+        /**
+         * Determines whether to emit the "design:returntype" metadata based on the node's kind.
+         * The caller should have already tested whether the node has decorators and whether the
+         * emitDecoratorMetadata compiler option is set.
+         *
+         * @param node The node to test.
+         */
         function shouldAddReturnTypeMetadata(node) {
-            return node.kind === 154;
+            return node.kind === 154 /* MethodDeclaration */;
         }
+        /**
+         * Determines whether to emit the "design:paramtypes" metadata based on the node's kind.
+         * The caller should have already tested whether the node has decorators and whether the
+         * emitDecoratorMetadata compiler option is set.
+         *
+         * @param node The node to test.
+         */
         function shouldAddParamTypesMetadata(node) {
             switch (node.kind) {
-                case 235:
-                case 205:
+                case 235 /* ClassDeclaration */:
+                case 205 /* ClassExpression */:
                     return ts.getFirstConstructorWithBody(node) !== undefined;
-                case 154:
-                case 156:
-                case 157:
+                case 154 /* MethodDeclaration */:
+                case 156 /* GetAccessor */:
+                case 157 /* SetAccessor */:
                     return true;
             }
             return false;
         }
+        /**
+         * Serializes the type of a node for use with decorator type metadata.
+         *
+         * @param node The node that should have its type serialized.
+         */
         function serializeTypeOfNode(node) {
             switch (node.kind) {
-                case 152:
-                case 149:
-                case 156:
+                case 152 /* PropertyDeclaration */:
+                case 149 /* Parameter */:
+                case 156 /* GetAccessor */:
                     return serializeTypeNode(node.type);
-                case 157:
+                case 157 /* SetAccessor */:
                     return serializeTypeNode(ts.getSetAccessorTypeAnnotationNode(node));
-                case 235:
-                case 205:
-                case 154:
+                case 235 /* ClassDeclaration */:
+                case 205 /* ClassExpression */:
+                case 154 /* MethodDeclaration */:
                     return ts.createIdentifier("Function");
                 default:
                     return ts.createVoidZero();
             }
         }
+        /**
+         * Serializes the types of the parameters of a node for use with decorator type metadata.
+         *
+         * @param node The node that should have its parameter types serialized.
+         */
         function serializeParameterTypesOfNode(node, container) {
             var valueDeclaration = ts.isClassLike(node)
                 ? ts.getFirstConstructorWithBody(node)
@@ -49784,7 +62562,7 @@ var ts;
             return ts.createArrayLiteral(expressions);
         }
         function getParametersOfDecoratedDeclaration(node, container) {
-            if (container && node.kind === 156) {
+            if (container && node.kind === 156 /* GetAccessor */) {
                 var setAccessor = ts.getAllAccessorDeclarations(container.members, node).setAccessor;
                 if (setAccessor) {
                     return setAccessor.parameters;
@@ -49792,6 +62570,11 @@ var ts;
             }
             return node.parameters;
         }
+        /**
+         * Serializes the return type of a node for use with decorator type metadata.
+         *
+         * @param node The node that should have its return type serialized.
+         */
         function serializeReturnTypeOfNode(node) {
             if (ts.isFunctionLike(node) && node.type) {
                 return serializeTypeNode(node.type);
@@ -49801,62 +62584,81 @@ var ts;
             }
             return ts.createVoidZero();
         }
+        /**
+         * Serializes a type node for use with decorator type metadata.
+         *
+         * Types are serialized in the following fashion:
+         * - Void types point to "undefined" (e.g. "void 0")
+         * - Function and Constructor types point to the global "Function" constructor.
+         * - Interface types with a call or construct signature types point to the global
+         *   "Function" constructor.
+         * - Array and Tuple types point to the global "Array" constructor.
+         * - Type predicates and booleans point to the global "Boolean" constructor.
+         * - String literal types and strings point to the global "String" constructor.
+         * - Enum and number types point to the global "Number" constructor.
+         * - Symbol types point to the global "Symbol" constructor.
+         * - Type references to classes (or class-like variables) point to the constructor for the class.
+         * - Anything else points to the global "Object" constructor.
+         *
+         * @param node The type node to serialize.
+         */
         function serializeTypeNode(node) {
             if (node === undefined) {
                 return ts.createIdentifier("Object");
             }
             switch (node.kind) {
-                case 105:
-                case 140:
-                case 95:
-                case 131:
+                case 105 /* VoidKeyword */:
+                case 140 /* UndefinedKeyword */:
+                case 95 /* NullKeyword */:
+                case 131 /* NeverKeyword */:
                     return ts.createVoidZero();
-                case 173:
+                case 173 /* ParenthesizedType */:
                     return serializeTypeNode(node.type);
-                case 163:
-                case 164:
+                case 163 /* FunctionType */:
+                case 164 /* ConstructorType */:
                     return ts.createIdentifier("Function");
-                case 167:
-                case 168:
+                case 167 /* ArrayType */:
+                case 168 /* TupleType */:
                     return ts.createIdentifier("Array");
-                case 161:
-                case 122:
+                case 161 /* TypePredicate */:
+                case 122 /* BooleanKeyword */:
                     return ts.createIdentifier("Boolean");
-                case 137:
+                case 137 /* StringKeyword */:
                     return ts.createIdentifier("String");
-                case 135:
+                case 135 /* ObjectKeyword */:
                     return ts.createIdentifier("Object");
-                case 178:
+                case 178 /* LiteralType */:
                     switch (node.literal.kind) {
-                        case 9:
+                        case 9 /* StringLiteral */:
                             return ts.createIdentifier("String");
-                        case 8:
+                        case 8 /* NumericLiteral */:
                             return ts.createIdentifier("Number");
-                        case 101:
-                        case 86:
+                        case 101 /* TrueKeyword */:
+                        case 86 /* FalseKeyword */:
                             return ts.createIdentifier("Boolean");
                         default:
                             return ts.Debug.failBadSyntaxKind(node.literal);
                     }
-                case 134:
+                case 134 /* NumberKeyword */:
                     return ts.createIdentifier("Number");
-                case 138:
-                    return languageVersion < 2
+                case 138 /* SymbolKeyword */:
+                    return languageVersion < 2 /* ES2015 */
                         ? getGlobalSymbolNameWithFallback()
                         : ts.createIdentifier("Symbol");
-                case 162:
+                case 162 /* TypeReference */:
                     return serializeTypeReferenceNode(node);
-                case 170:
-                case 169:
+                case 170 /* IntersectionType */:
+                case 169 /* UnionType */:
                     return serializeUnionOrIntersectionType(node);
-                case 165:
-                case 175:
-                case 176:
-                case 177:
-                case 166:
-                case 119:
-                case 142:
-                case 174:
+                case 165 /* TypeQuery */:
+                case 175 /* TypeOperator */:
+                case 176 /* IndexedAccessType */:
+                case 177 /* MappedType */:
+                case 166 /* TypeLiteral */:
+                case 119 /* AnyKeyword */:
+                case 142 /* UnknownKeyword */:
+                case 174 /* ThisType */:
+                case 179 /* ImportType */:
                     break;
                 default:
                     return ts.Debug.failBadSyntaxKind(node);
@@ -49864,23 +62666,29 @@ var ts;
             return ts.createIdentifier("Object");
         }
         function serializeUnionOrIntersectionType(node) {
+            // Note when updating logic here also update getEntityNameForDecoratorMetadata
+            // so that aliases can be marked as referenced
             var serializedUnion;
             for (var _i = 0, _a = node.types; _i < _a.length; _i++) {
                 var typeNode = _a[_i];
-                while (typeNode.kind === 173) {
-                    typeNode = typeNode.type;
+                while (typeNode.kind === 173 /* ParenthesizedType */) {
+                    typeNode = typeNode.type; // Skip parens if need be
                 }
-                if (typeNode.kind === 131) {
-                    continue;
+                if (typeNode.kind === 131 /* NeverKeyword */) {
+                    continue; // Always elide `never` from the union/intersection if possible
                 }
-                if (!strictNullChecks && (typeNode.kind === 95 || typeNode.kind === 140)) {
-                    continue;
+                if (!strictNullChecks && (typeNode.kind === 95 /* NullKeyword */ || typeNode.kind === 140 /* UndefinedKeyword */)) {
+                    continue; // Elide null and undefined from unions for metadata, just like what we did prior to the implementation of strict null checks
                 }
                 var serializedIndividual = serializeTypeNode(typeNode);
                 if (ts.isIdentifier(serializedIndividual) && serializedIndividual.escapedText === "Object") {
+                    // One of the individual is global object, return immediately
                     return serializedIndividual;
                 }
+                // If there exists union that is not void 0 expression, check if the the common type is identifier.
+                // anything more complex and we will just default to Object
                 else if (serializedUnion) {
+                    // Different types
                     if (!ts.isIdentifier(serializedUnion) ||
                         !ts.isIdentifier(serializedIndividual) ||
                         serializedUnion.escapedText !== serializedIndividual.escapedText) {
@@ -49888,20 +62696,28 @@ var ts;
                     }
                 }
                 else {
+                    // Initialize the union type
                     serializedUnion = serializedIndividual;
                 }
             }
-            return serializedUnion || ts.createVoidZero();
+            // If we were able to find common type, use it
+            return serializedUnion || ts.createVoidZero(); // Fallback is only hit if all union constituients are null/undefined/never
         }
+        /**
+         * Serializes a TypeReferenceNode to an appropriate JS constructor value for use with
+         * decorator type metadata.
+         *
+         * @param node The type reference node.
+         */
         function serializeTypeReferenceNode(node) {
             var kind = resolver.getTypeReferenceSerializationKind(node.typeName, currentScope);
             switch (kind) {
                 case ts.TypeReferenceSerializationKind.Unknown:
-                    var serialized = serializeEntityNameAsExpression(node.typeName, true);
+                    var serialized = serializeEntityNameAsExpression(node.typeName, /*useFallback*/ true);
                     var temp = ts.createTempVariable(hoistVariableDeclaration);
                     return ts.createLogicalOr(ts.createLogicalAnd(ts.createTypeCheck(ts.createAssignment(temp, serialized), "function"), temp), ts.createIdentifier("Object"));
                 case ts.TypeReferenceSerializationKind.TypeWithConstructSignatureAndValue:
-                    return serializeEntityNameAsExpression(node.typeName, false);
+                    return serializeEntityNameAsExpression(node.typeName, /*useFallback*/ false);
                 case ts.TypeReferenceSerializationKind.VoidNullableOrNeverType:
                     return ts.createVoidZero();
                 case ts.TypeReferenceSerializationKind.BooleanType:
@@ -49913,7 +62729,7 @@ var ts;
                 case ts.TypeReferenceSerializationKind.ArrayLikeType:
                     return ts.createIdentifier("Array");
                 case ts.TypeReferenceSerializationKind.ESSymbolType:
-                    return languageVersion < 2
+                    return languageVersion < 2 /* ES2015 */
                         ? getGlobalSymbolNameWithFallback()
                         : ts.createIdentifier("Symbol");
                 case ts.TypeReferenceSerializationKind.TypeWithCallSignature:
@@ -49926,42 +62742,73 @@ var ts;
                     return ts.Debug.assertNever(kind);
             }
         }
+        /**
+         * Serializes an entity name as an expression for decorator type metadata.
+         *
+         * @param node The entity name to serialize.
+         * @param useFallback A value indicating whether to use logical operators to test for the
+         *                    entity name at runtime.
+         */
         function serializeEntityNameAsExpression(node, useFallback) {
             switch (node.kind) {
-                case 71:
+                case 71 /* Identifier */:
+                    // Create a clone of the name with a new parent, and treat it as if it were
+                    // a source tree node for the purposes of the checker.
                     var name = ts.getMutableClone(node);
-                    name.flags &= ~8;
+                    name.flags &= ~8 /* Synthesized */;
                     name.original = undefined;
-                    name.parent = ts.getParseTreeNode(currentScope);
+                    name.parent = ts.getParseTreeNode(currentScope); // ensure the parent is set to a parse tree node.
                     if (useFallback) {
                         return ts.createLogicalAnd(ts.createStrictInequality(ts.createTypeOf(name), ts.createLiteral("undefined")), name);
                     }
                     return name;
-                case 146:
+                case 146 /* QualifiedName */:
                     return serializeQualifiedNameAsExpression(node, useFallback);
             }
         }
+        /**
+         * Serializes an qualified name as an expression for decorator type metadata.
+         *
+         * @param node The qualified name to serialize.
+         * @param useFallback A value indicating whether to use logical operators to test for the
+         *                    qualified name at runtime.
+         */
         function serializeQualifiedNameAsExpression(node, useFallback) {
             var left;
-            if (node.left.kind === 71) {
+            if (node.left.kind === 71 /* Identifier */) {
                 left = serializeEntityNameAsExpression(node.left, useFallback);
             }
             else if (useFallback) {
                 var temp = ts.createTempVariable(hoistVariableDeclaration);
-                left = ts.createLogicalAnd(ts.createAssignment(temp, serializeEntityNameAsExpression(node.left, true)), temp);
+                left = ts.createLogicalAnd(ts.createAssignment(temp, serializeEntityNameAsExpression(node.left, /*useFallback*/ true)), temp);
             }
             else {
-                left = serializeEntityNameAsExpression(node.left, false);
+                left = serializeEntityNameAsExpression(node.left, /*useFallback*/ false);
             }
             return ts.createPropertyAccess(left, node.right);
         }
+        /**
+         * Gets an expression that points to the global "Symbol" constructor at runtime if it is
+         * available.
+         */
         function getGlobalSymbolNameWithFallback() {
             return ts.createConditional(ts.createTypeCheck(ts.createIdentifier("Symbol"), "function"), ts.createIdentifier("Symbol"), ts.createIdentifier("Object"));
         }
+        /**
+         * A simple inlinable expression is an expression which can be copied into multiple locations
+         * without risk of repeating any sideeffects and whose value could not possibly change between
+         * any such locations
+         */
         function isSimpleInlineableExpression(expression) {
             return !ts.isIdentifier(expression) && ts.isSimpleCopiableExpression(expression) ||
                 ts.isWellKnownSymbolSyntactically(expression);
         }
+        /**
+         * Gets an expression that represents a property name. For a computed property, a
+         * name is generated for the node.
+         *
+         * @param member The member whose name should be converted into an expression.
+         */
         function getExpressionForPropertyName(member, generateNameForComputedPropertyName) {
             var name = member.name;
             if (ts.isComputedPropertyName(name)) {
@@ -49976,6 +62823,12 @@ var ts;
                 return ts.getSynthesizedClone(name);
             }
         }
+        /**
+         * If the name is a computed property, this function transforms it, then either returns an expression which caches the
+         * value of the result or the expression itself if the value is either unused or safe to inline into multiple locations
+         * @param shouldHoist Does the expression need to be reused? (ie, for an initializer or a decorator)
+         * @param omitSimple Should expressions with no observable side-effects be elided? (ie, the expression is not hoisted for a decorator or initializer and is a literal)
+         */
         function getPropertyNameExpressionIfNeeded(name, shouldHoist, omitSimple) {
             if (ts.isComputedPropertyName(name)) {
                 var expression = ts.visitNode(name.expression, visitor, ts.isExpression);
@@ -49989,10 +62842,18 @@ var ts;
                 return (omitSimple && (inlinable || ts.isIdentifier(innerExpression))) ? undefined : expression;
             }
         }
+        /**
+         * Visits the property name of a class element, for use when emitting property
+         * initializers. For a computed property on a node with decorators, a temporary
+         * value is stored for later use.
+         *
+         * @param member The member whose name should be visited.
+         */
         function visitPropertyNameOfClassElement(member) {
             var name = member.name;
-            var expr = getPropertyNameExpressionIfNeeded(name, ts.some(member.decorators), false);
-            if (expr) {
+            var expr = getPropertyNameExpressionIfNeeded(name, ts.some(member.decorators), /*omitSimple*/ false);
+            if (expr) { // expr only exists if `name` is a computed property name
+                // Inline any pending expressions from previous elided or relocated computed property name expressions in order to preserve execution order
                 if (ts.some(pendingExpressions)) {
                     expr = ts.inlineExpressions(pendingExpressions.concat([expr]));
                     pendingExpressions.length = 0;
@@ -50003,21 +62864,45 @@ var ts;
                 return name;
             }
         }
+        /**
+         * Transforms a HeritageClause with TypeScript syntax.
+         *
+         * This function will only be called when one of the following conditions are met:
+         * - The node is a non-`extends` heritage clause that should be elided.
+         * - The node is an `extends` heritage clause that should be visited, but only allow a single type.
+         *
+         * @param node The HeritageClause to transform.
+         */
         function visitHeritageClause(node) {
-            if (node.token === 85) {
+            if (node.token === 85 /* ExtendsKeyword */) {
                 var types = ts.visitNodes(node.types, visitor, ts.isExpressionWithTypeArguments, 0, 1);
-                return ts.setTextRange(ts.createHeritageClause(85, types), node);
+                return ts.setTextRange(ts.createHeritageClause(85 /* ExtendsKeyword */, types), node);
             }
             return undefined;
         }
+        /**
+         * Transforms an ExpressionWithTypeArguments with TypeScript syntax.
+         *
+         * This function will only be called when one of the following conditions are met:
+         * - The node contains type arguments that should be elided.
+         *
+         * @param node The ExpressionWithTypeArguments to transform.
+         */
         function visitExpressionWithTypeArguments(node) {
-            return ts.updateExpressionWithTypeArguments(node, undefined, ts.visitNode(node.expression, visitor, ts.isLeftHandSideExpression));
+            return ts.updateExpressionWithTypeArguments(node, 
+            /*typeArguments*/ undefined, ts.visitNode(node.expression, visitor, ts.isLeftHandSideExpression));
         }
+        /**
+         * Determines whether to emit a function-like declaration. We should not emit the
+         * declaration if it does not have a body.
+         *
+         * @param node The declaration node.
+         */
         function shouldEmitFunctionLikeDeclaration(node) {
             return !ts.nodeIsMissing(node.body);
         }
         function visitPropertyDeclaration(node) {
-            var expr = getPropertyNameExpressionIfNeeded(node.name, ts.some(node.decorators) || !!node.initializer, true);
+            var expr = getPropertyNameExpressionIfNeeded(node.name, ts.some(node.decorators) || !!node.initializer, /*omitSimple*/ true);
             if (expr && !isSimpleInlineableExpression(expr)) {
                 (pendingExpressions || (pendingExpressions = [])).push(expr);
             }
@@ -50029,47 +62914,107 @@ var ts;
             }
             return ts.updateConstructor(node, ts.visitNodes(node.decorators, visitor, ts.isDecorator), ts.visitNodes(node.modifiers, visitor, ts.isModifier), ts.visitParameterList(node.parameters, visitor, context), ts.visitFunctionBody(node.body, visitor, context));
         }
+        /**
+         * Visits a method declaration of a class.
+         *
+         * This function will be called when one of the following conditions are met:
+         * - The node is an overload
+         * - The node is marked as abstract, public, private, protected, or readonly
+         * - The node has a computed property name
+         *
+         * @param node The method node.
+         */
         function visitMethodDeclaration(node) {
             if (!shouldEmitFunctionLikeDeclaration(node)) {
                 return undefined;
             }
-            var updated = ts.updateMethod(node, undefined, ts.visitNodes(node.modifiers, modifierVisitor, ts.isModifier), node.asteriskToken, visitPropertyNameOfClassElement(node), undefined, undefined, ts.visitParameterList(node.parameters, visitor, context), undefined, ts.visitFunctionBody(node.body, visitor, context));
+            var updated = ts.updateMethod(node, 
+            /*decorators*/ undefined, ts.visitNodes(node.modifiers, modifierVisitor, ts.isModifier), node.asteriskToken, visitPropertyNameOfClassElement(node), 
+            /*questionToken*/ undefined, 
+            /*typeParameters*/ undefined, ts.visitParameterList(node.parameters, visitor, context), 
+            /*type*/ undefined, ts.visitFunctionBody(node.body, visitor, context));
             if (updated !== node) {
+                // While we emit the source map for the node after skipping decorators and modifiers,
+                // we need to emit the comments for the original range.
                 ts.setCommentRange(updated, node);
                 ts.setSourceMapRange(updated, ts.moveRangePastDecorators(node));
             }
             return updated;
         }
+        /**
+         * Determines whether to emit an accessor declaration. We should not emit the
+         * declaration if it does not have a body and is abstract.
+         *
+         * @param node The declaration node.
+         */
         function shouldEmitAccessorDeclaration(node) {
-            return !(ts.nodeIsMissing(node.body) && ts.hasModifier(node, 128));
+            return !(ts.nodeIsMissing(node.body) && ts.hasModifier(node, 128 /* Abstract */));
         }
+        /**
+         * Visits a get accessor declaration of a class.
+         *
+         * This function will be called when one of the following conditions are met:
+         * - The node is marked as abstract, public, private, or protected
+         * - The node has a computed property name
+         *
+         * @param node The get accessor node.
+         */
         function visitGetAccessor(node) {
             if (!shouldEmitAccessorDeclaration(node)) {
                 return undefined;
             }
-            var updated = ts.updateGetAccessor(node, undefined, ts.visitNodes(node.modifiers, modifierVisitor, ts.isModifier), visitPropertyNameOfClassElement(node), ts.visitParameterList(node.parameters, visitor, context), undefined, ts.visitFunctionBody(node.body, visitor, context) || ts.createBlock([]));
+            var updated = ts.updateGetAccessor(node, 
+            /*decorators*/ undefined, ts.visitNodes(node.modifiers, modifierVisitor, ts.isModifier), visitPropertyNameOfClassElement(node), ts.visitParameterList(node.parameters, visitor, context), 
+            /*type*/ undefined, ts.visitFunctionBody(node.body, visitor, context) || ts.createBlock([]));
             if (updated !== node) {
+                // While we emit the source map for the node after skipping decorators and modifiers,
+                // we need to emit the comments for the original range.
                 ts.setCommentRange(updated, node);
                 ts.setSourceMapRange(updated, ts.moveRangePastDecorators(node));
             }
             return updated;
         }
+        /**
+         * Visits a set accessor declaration of a class.
+         *
+         * This function will be called when one of the following conditions are met:
+         * - The node is marked as abstract, public, private, or protected
+         * - The node has a computed property name
+         *
+         * @param node The set accessor node.
+         */
         function visitSetAccessor(node) {
             if (!shouldEmitAccessorDeclaration(node)) {
                 return undefined;
             }
-            var updated = ts.updateSetAccessor(node, undefined, ts.visitNodes(node.modifiers, modifierVisitor, ts.isModifier), visitPropertyNameOfClassElement(node), ts.visitParameterList(node.parameters, visitor, context), ts.visitFunctionBody(node.body, visitor, context) || ts.createBlock([]));
+            var updated = ts.updateSetAccessor(node, 
+            /*decorators*/ undefined, ts.visitNodes(node.modifiers, modifierVisitor, ts.isModifier), visitPropertyNameOfClassElement(node), ts.visitParameterList(node.parameters, visitor, context), ts.visitFunctionBody(node.body, visitor, context) || ts.createBlock([]));
             if (updated !== node) {
+                // While we emit the source map for the node after skipping decorators and modifiers,
+                // we need to emit the comments for the original range.
                 ts.setCommentRange(updated, node);
                 ts.setSourceMapRange(updated, ts.moveRangePastDecorators(node));
             }
             return updated;
         }
+        /**
+         * Visits a function declaration.
+         *
+         * This function will be called when one of the following conditions are met:
+         * - The node is an overload
+         * - The node is exported from a TypeScript namespace
+         * - The node has decorators
+         *
+         * @param node The function node.
+         */
         function visitFunctionDeclaration(node) {
             if (!shouldEmitFunctionLikeDeclaration(node)) {
                 return ts.createNotEmittedStatement(node);
             }
-            var updated = ts.updateFunctionDeclaration(node, undefined, ts.visitNodes(node.modifiers, modifierVisitor, ts.isModifier), node.asteriskToken, node.name, undefined, ts.visitParameterList(node.parameters, visitor, context), undefined, ts.visitFunctionBody(node.body, visitor, context) || ts.createBlock([]));
+            var updated = ts.updateFunctionDeclaration(node, 
+            /*decorators*/ undefined, ts.visitNodes(node.modifiers, modifierVisitor, ts.isModifier), node.asteriskToken, node.name, 
+            /*typeParameters*/ undefined, ts.visitParameterList(node.parameters, visitor, context), 
+            /*type*/ undefined, ts.visitFunctionBody(node.body, visitor, context) || ts.createBlock([]));
             if (isExportOfNamespace(node)) {
                 var statements = [updated];
                 addExportMemberAssignment(statements, node);
@@ -50077,33 +63022,73 @@ var ts;
             }
             return updated;
         }
+        /**
+         * Visits a function expression node.
+         *
+         * This function will be called when one of the following conditions are met:
+         * - The node has type annotations
+         *
+         * @param node The function expression node.
+         */
         function visitFunctionExpression(node) {
             if (!shouldEmitFunctionLikeDeclaration(node)) {
                 return ts.createOmittedExpression();
             }
-            var updated = ts.updateFunctionExpression(node, ts.visitNodes(node.modifiers, modifierVisitor, ts.isModifier), node.asteriskToken, node.name, undefined, ts.visitParameterList(node.parameters, visitor, context), undefined, ts.visitFunctionBody(node.body, visitor, context) || ts.createBlock([]));
+            var updated = ts.updateFunctionExpression(node, ts.visitNodes(node.modifiers, modifierVisitor, ts.isModifier), node.asteriskToken, node.name, 
+            /*typeParameters*/ undefined, ts.visitParameterList(node.parameters, visitor, context), 
+            /*type*/ undefined, ts.visitFunctionBody(node.body, visitor, context) || ts.createBlock([]));
             return updated;
         }
+        /**
+         * @remarks
+         * This function will be called when one of the following conditions are met:
+         * - The node has type annotations
+         */
         function visitArrowFunction(node) {
-            var updated = ts.updateArrowFunction(node, ts.visitNodes(node.modifiers, modifierVisitor, ts.isModifier), undefined, ts.visitParameterList(node.parameters, visitor, context), undefined, node.equalsGreaterThanToken, ts.visitFunctionBody(node.body, visitor, context));
+            var updated = ts.updateArrowFunction(node, ts.visitNodes(node.modifiers, modifierVisitor, ts.isModifier), 
+            /*typeParameters*/ undefined, ts.visitParameterList(node.parameters, visitor, context), 
+            /*type*/ undefined, node.equalsGreaterThanToken, ts.visitFunctionBody(node.body, visitor, context));
             return updated;
         }
+        /**
+         * Visits a parameter declaration node.
+         *
+         * This function will be called when one of the following conditions are met:
+         * - The node has an accessibility modifier.
+         * - The node has a questionToken.
+         * - The node's kind is ThisKeyword.
+         *
+         * @param node The parameter declaration node.
+         */
         function visitParameter(node) {
             if (ts.parameterIsThisKeyword(node)) {
                 return undefined;
             }
-            var parameter = ts.createParameter(undefined, undefined, node.dotDotDotToken, ts.visitNode(node.name, visitor, ts.isBindingName), undefined, undefined, ts.visitNode(node.initializer, visitor, ts.isExpression));
+            var parameter = ts.createParameter(
+            /*decorators*/ undefined, 
+            /*modifiers*/ undefined, node.dotDotDotToken, ts.visitNode(node.name, visitor, ts.isBindingName), 
+            /*questionToken*/ undefined, 
+            /*type*/ undefined, ts.visitNode(node.initializer, visitor, ts.isExpression));
+            // While we emit the source map for the node after skipping decorators and modifiers,
+            // we need to emit the comments for the original range.
             ts.setOriginalNode(parameter, node);
             ts.setTextRange(parameter, ts.moveRangePastModifiers(node));
             ts.setCommentRange(parameter, node);
             ts.setSourceMapRange(parameter, ts.moveRangePastModifiers(node));
-            ts.setEmitFlags(parameter.name, 32);
+            ts.setEmitFlags(parameter.name, 32 /* NoTrailingSourceMap */);
             return parameter;
         }
+        /**
+         * Visits a variable statement in a namespace.
+         *
+         * This function will be called when one of the following conditions are met:
+         * - The node is exported from a TypeScript namespace.
+         */
         function visitVariableStatement(node) {
             if (isExportOfNamespace(node)) {
                 var variables = ts.getInitializedVariables(node.declarationList);
                 if (variables.length === 0) {
+                    // elide statement if there are no initialized variables.
                     return undefined;
                 }
                 return ts.setTextRange(ts.createStatement(ts.inlineExpressions(ts.map(variables, transformInitializedVariable))), node);
@@ -50115,19 +63100,45 @@ var ts;
         function transformInitializedVariable(node) {
             var name = node.name;
             if (ts.isBindingPattern(name)) {
-                return ts.flattenDestructuringAssignment(node, visitor, context, 0, false, createNamespaceExportExpression);
+                return ts.flattenDestructuringAssignment(node, visitor, context, 0 /* All */, 
+                /*needsValue*/ false, createNamespaceExportExpression);
             }
             else {
-                return ts.setTextRange(ts.createAssignment(getNamespaceMemberNameWithSourceMapsAndWithoutComments(name), ts.visitNode(node.initializer, visitor, ts.isExpression)), node);
+                return ts.setTextRange(ts.createAssignment(getNamespaceMemberNameWithSourceMapsAndWithoutComments(name), ts.visitNode(node.initializer, visitor, ts.isExpression)), 
+                /*location*/ node);
             }
         }
         function visitVariableDeclaration(node) {
-            return ts.updateVariableDeclaration(node, ts.visitNode(node.name, visitor, ts.isBindingName), undefined, ts.visitNode(node.initializer, visitor, ts.isExpression));
+            return ts.updateVariableDeclaration(node, ts.visitNode(node.name, visitor, ts.isBindingName), 
+            /*type*/ undefined, ts.visitNode(node.initializer, visitor, ts.isExpression));
         }
+        /**
+         * Visits a parenthesized expression that contains either a type assertion or an `as`
+         * expression.
+         *
+         * @param node The parenthesized expression node.
+         */
         function visitParenthesizedExpression(node) {
-            var innerExpression = ts.skipOuterExpressions(node.expression, ~2);
+            var innerExpression = ts.skipOuterExpressions(node.expression, ~2 /* Assertions */);
             if (ts.isAssertionExpression(innerExpression)) {
+                // Make sure we consider all nested cast expressions, e.g.:
+                // (<any><number><any>-A).x;
                 var expression = ts.visitNode(node.expression, visitor, ts.isExpression);
+                // We have an expression of the form: (<Type>SubExpr). Emitting this as (SubExpr)
+                // is really not desirable. We would like to emit the subexpression as-is. Omitting
+                // the parentheses, however, could cause change in the semantics of the generated
+                // code if the casted expression has a lower precedence than the rest of the
+                // expression.
+                //
+                // To preserve comments, we return a "PartiallyEmittedExpression" here which will
+                // preserve the position information of the original expression.
+                //
+                // Due to the auto-parenthesization rules used by the visitor and factory functions
+                // we can safely elide the parentheses here, as a new synthetic
+                // ParenthesizedExpression will be inserted if we remove parentheses too
+                // aggressively.
+                // HOWEVER - if there are leading comments on the expression itself, to handle ASI
+                // correctly for return and throw, we must keep the parenthesis
                 if (ts.length(ts.getLeadingCommentRangesOfNode(expression, currentSourceFile))) {
                     return ts.updateParen(node, expression);
                 }
@@ -50144,48 +63155,93 @@ var ts;
             return ts.createPartiallyEmittedExpression(expression, node);
         }
         function visitCallExpression(node) {
-            return ts.updateCall(node, ts.visitNode(node.expression, visitor, ts.isExpression), undefined, ts.visitNodes(node.arguments, visitor, ts.isExpression));
+            return ts.updateCall(node, ts.visitNode(node.expression, visitor, ts.isExpression), 
+            /*typeArguments*/ undefined, ts.visitNodes(node.arguments, visitor, ts.isExpression));
         }
         function visitNewExpression(node) {
-            return ts.updateNew(node, ts.visitNode(node.expression, visitor, ts.isExpression), undefined, ts.visitNodes(node.arguments, visitor, ts.isExpression));
+            return ts.updateNew(node, ts.visitNode(node.expression, visitor, ts.isExpression), 
+            /*typeArguments*/ undefined, ts.visitNodes(node.arguments, visitor, ts.isExpression));
         }
         function visitTaggedTemplateExpression(node) {
-            return ts.updateTaggedTemplate(node, ts.visitNode(node.tag, visitor, ts.isExpression), undefined, ts.visitNode(node.template, visitor, ts.isExpression));
+            return ts.updateTaggedTemplate(node, ts.visitNode(node.tag, visitor, ts.isExpression), 
+            /*typeArguments*/ undefined, ts.visitNode(node.template, visitor, ts.isExpression));
         }
+        /**
+         * Determines whether to emit an enum declaration.
+         *
+         * @param node The enum declaration node.
+         */
         function shouldEmitEnumDeclaration(node) {
             return !ts.isConst(node)
                 || compilerOptions.preserveConstEnums
                 || compilerOptions.isolatedModules;
         }
+        /**
+         * Visits an enum declaration.
+         *
+         * This function will be called any time a TypeScript enum is encountered.
+         *
+         * @param node The enum declaration node.
+         */
         function visitEnumDeclaration(node) {
             if (!shouldEmitEnumDeclaration(node)) {
                 return undefined;
             }
             var statements = [];
-            var emitFlags = 2;
+            // We request to be advised when the printer is about to print this node. This allows
+            // us to set up the correct state for later substitutions.
+            var emitFlags = 2 /* AdviseOnEmitNode */;
+            // If needed, we should emit a variable declaration for the enum. If we emit
+            // a leading variable declaration, we should not emit leading comments for the
+            // enum body.
             if (addVarForEnumOrModuleDeclaration(statements, node)) {
+                // We should still emit the comments if we are emitting a system module.
                 if (moduleKind !== ts.ModuleKind.System || currentScope !== currentSourceFile) {
-                    emitFlags |= 512;
+                    emitFlags |= 512 /* NoLeadingComments */;
                 }
             }
+            // `parameterName` is the declaration name used inside of the enum.
             var parameterName = getNamespaceParameterName(node);
+            // `containerName` is the expression used inside of the enum for assignments.
             var containerName = getNamespaceContainerName(node);
-            var exportName = ts.hasModifier(node, 1)
-                ? ts.getExternalModuleOrNamespaceExportName(currentNamespaceContainerName, node, false, true)
-                : ts.getLocalName(node, false, true);
+            // `exportName` is the expression used within this node's container for any exported references.
+            var exportName = ts.hasModifier(node, 1 /* Export */)
+                ? ts.getExternalModuleOrNamespaceExportName(currentNamespaceContainerName, node, /*allowComments*/ false, /*allowSourceMaps*/ true)
+                : ts.getLocalName(node, /*allowComments*/ false, /*allowSourceMaps*/ true);
+            //  x || (x = {})
+            //  exports.x || (exports.x = {})
             var moduleArg = ts.createLogicalOr(exportName, ts.createAssignment(exportName, ts.createObjectLiteral()));
             if (hasNamespaceQualifiedExportName(node)) {
-                var localName = ts.getLocalName(node, false, true);
+                // `localName` is the expression used within this node's containing scope for any local references.
+                var localName = ts.getLocalName(node, /*allowComments*/ false, /*allowSourceMaps*/ true);
+                //  x = (exports.x || (exports.x = {}))
                 moduleArg = ts.createAssignment(localName, moduleArg);
             }
-            var enumStatement = ts.createStatement(ts.createCall(ts.createFunctionExpression(undefined, undefined, undefined, undefined, [ts.createParameter(undefined, undefined, undefined, parameterName)], undefined, transformEnumBody(node, containerName)), undefined, [moduleArg]));
+            //  (function (x) {
+            //      x[x["y"] = 0] = "y";
+            //      ...
+            //  })(x || (x = {}));
+            var enumStatement = ts.createStatement(ts.createCall(ts.createFunctionExpression(
+            /*modifiers*/ undefined, 
+            /*asteriskToken*/ undefined, 
+            /*name*/ undefined, 
+            /*typeParameters*/ undefined, [ts.createParameter(/*decorators*/ undefined, /*modifiers*/ undefined, /*dotDotDotToken*/ undefined, parameterName)], 
+            /*type*/ undefined, transformEnumBody(node, containerName)), 
+            /*typeArguments*/ undefined, [moduleArg]));
             ts.setOriginalNode(enumStatement, node);
             ts.setTextRange(enumStatement, node);
             ts.setEmitFlags(enumStatement, emitFlags);
             statements.push(enumStatement);
+            // Add a DeclarationMarker for the enum to preserve trailing comments and mark
+            // the end of the declaration.
             statements.push(ts.createEndOfDeclarationMarker(node));
             return statements;
         }
+        /**
+         * Transforms the body of an enum declaration.
+         *
+         * @param node The enum declaration node.
+         */
         function transformEnumBody(node, localName) {
             var savedCurrentNamespaceLocalName = currentNamespaceContainerName;
             currentNamespaceContainerName = localName;
@@ -50195,17 +63251,31 @@ var ts;
             ts.prependStatements(statements, endLexicalEnvironment());
             ts.addRange(statements, members);
             currentNamespaceContainerName = savedCurrentNamespaceLocalName;
-            return ts.createBlock(ts.setTextRange(ts.createNodeArray(statements), node.members), true);
+            return ts.createBlock(ts.setTextRange(ts.createNodeArray(statements), /*location*/ node.members), 
+            /*multiLine*/ true);
         }
+        /**
+         * Transforms an enum member into a statement.
+         *
+         * @param member The enum member node.
+         */
         function transformEnumMember(member) {
-            var name = getExpressionForPropertyName(member, false);
+            // enums don't support computed properties
+            // we pass false as 'generateNameForComputedPropertyName' for a backward compatibility purposes
+            // old emitter always generate 'expression' part of the name as-is.
+            var name = getExpressionForPropertyName(member, /*generateNameForComputedPropertyName*/ false);
             var valueExpression = transformEnumMemberDeclarationValue(member);
             var innerAssignment = ts.createAssignment(ts.createElementAccess(currentNamespaceContainerName, name), valueExpression);
-            var outerAssignment = valueExpression.kind === 9 ?
+            var outerAssignment = valueExpression.kind === 9 /* StringLiteral */ ?
                 innerAssignment :
                 ts.createAssignment(ts.createElementAccess(currentNamespaceContainerName, innerAssignment), name);
             return ts.setTextRange(ts.createStatement(ts.setTextRange(outerAssignment, member)), member);
         }
+        /**
+         * Transforms the value of an enum member.
+         *
+         * @param member The enum member node.
+         */
         function transformEnumMemberDeclarationValue(member) {
             var value = resolver.getConstantValue(member);
             if (value !== undefined) {
@@ -50221,9 +63291,18 @@ var ts;
                 }
             }
         }
+        /**
+         * Determines whether to elide a module declaration.
+         *
+         * @param node The module declaration node.
+         */
         function shouldEmitModuleDeclaration(node) {
             return ts.isInstantiatedModule(node, !!compilerOptions.preserveConstEnums || !!compilerOptions.isolatedModules);
         }
+        /**
+         * Determines whether an exported declaration will have a qualified export name (e.g. `f.x`
+         * or `exports.x`).
+         */
         function hasNamespaceQualifiedExportName(node) {
             return isExportOfNamespace(node)
                 || (isExternalModuleExport(node)
@@ -50231,6 +63310,10 @@ var ts;
                     && moduleKind !== ts.ModuleKind.ESNext
                     && moduleKind !== ts.ModuleKind.System);
         }
+        /**
+         * Records that a declaration was emitted in the current scope, if it was the first
+         * declaration for the provided symbol.
+         */
         function recordEmittedDeclarationInScope(node) {
             if (!currentScopeFirstDeclarationsOfName) {
                 currentScopeFirstDeclarationsOfName = ts.createUnderscoreEscapedMap();
@@ -50240,6 +63323,10 @@ var ts;
                 currentScopeFirstDeclarationsOfName.set(name, node);
             }
         }
+        /**
+         * Determines whether a declaration is the first declaration with
+         * the same name emitted in the current scope.
+         */
         function isFirstEmittedDeclarationInScope(node) {
             if (currentScopeFirstDeclarationsOfName) {
                 var name = declaredNameInScope(node);
@@ -50251,31 +63338,67 @@ var ts;
             ts.Debug.assertNode(node.name, ts.isIdentifier);
             return node.name.escapedText;
         }
+        /**
+         * Adds a leading VariableStatement for a enum or module declaration.
+         */
         function addVarForEnumOrModuleDeclaration(statements, node) {
+            // Emit a variable statement for the module. We emit top-level enums as a `var`
+            // declaration to avoid static errors in global scripts scripts due to redeclaration.
+            // enums in any other scope are emitted as a `let` declaration.
             var statement = ts.createVariableStatement(ts.visitNodes(node.modifiers, modifierVisitor, ts.isModifier), ts.createVariableDeclarationList([
-                ts.createVariableDeclaration(ts.getLocalName(node, false, true))
-            ], currentScope.kind === 274 ? 0 : 1));
+                ts.createVariableDeclaration(ts.getLocalName(node, /*allowComments*/ false, /*allowSourceMaps*/ true))
+            ], currentScope.kind === 274 /* SourceFile */ ? 0 /* None */ : 1 /* Let */));
             ts.setOriginalNode(statement, node);
             recordEmittedDeclarationInScope(node);
             if (isFirstEmittedDeclarationInScope(node)) {
-                if (node.kind === 238) {
+                // Adjust the source map emit to match the old emitter.
+                if (node.kind === 238 /* EnumDeclaration */) {
                     ts.setSourceMapRange(statement.declarationList, node);
                 }
                 else {
                     ts.setSourceMapRange(statement, node);
                 }
+                // Trailing comments for module declaration should be emitted after the function closure
+                // instead of the variable statement:
+                //
+                //     /** Module comment*/
+                //     module m1 {
+                //         function foo4Export() {
+                //         }
+                //     } // trailing comment module
+                //
+                // Should emit:
+                //
+                //     /** Module comment*/
+                //     var m1;
+                //     (function (m1) {
+                //         function foo4Export() {
+                //         }
+                //     })(m1 || (m1 = {})); // trailing comment module
+                //
                 ts.setCommentRange(statement, node);
-                ts.setEmitFlags(statement, 1024 | 4194304);
+                ts.setEmitFlags(statement, 1024 /* NoTrailingComments */ | 4194304 /* HasEndOfDeclarationMarker */);
                 statements.push(statement);
                 return true;
             }
             else {
+                // For an EnumDeclaration or ModuleDeclaration that merges with a preceeding
+                // declaration we do not emit a leading variable declaration. To preserve the
+                // begin/end semantics of the declararation and to properly handle exports
+                // we wrap the leading variable declaration in a `MergeDeclarationMarker`.
                 var mergeMarker = ts.createMergeDeclarationMarker(statement);
-                ts.setEmitFlags(mergeMarker, 1536 | 4194304);
+                ts.setEmitFlags(mergeMarker, 1536 /* NoComments */ | 4194304 /* HasEndOfDeclarationMarker */);
                 statements.push(mergeMarker);
                 return false;
             }
         }
+        /**
+         * Visits a module declaration node.
+         *
+         * This function will be called any time a TypeScript namespace (ModuleDeclaration) is encountered.
+         *
+         * @param node The module declaration node.
+         */
         function visitModuleDeclaration(node) {
             if (!shouldEmitModuleDeclaration(node)) {
                 return ts.createNotEmittedStatement(node);
@@ -50283,30 +63406,59 @@ var ts;
             ts.Debug.assertNode(node.name, ts.isIdentifier, "A TypeScript namespace should have an Identifier name.");
             enableSubstitutionForNamespaceExports();
             var statements = [];
-            var emitFlags = 2;
+            // We request to be advised when the printer is about to print this node. This allows
+            // us to set up the correct state for later substitutions.
+            var emitFlags = 2 /* AdviseOnEmitNode */;
+            // If needed, we should emit a variable declaration for the module. If we emit
+            // a leading variable declaration, we should not emit leading comments for the
+            // module body.
             if (addVarForEnumOrModuleDeclaration(statements, node)) {
+                // We should still emit the comments if we are emitting a system module.
                 if (moduleKind !== ts.ModuleKind.System || currentScope !== currentSourceFile) {
-                    emitFlags |= 512;
+                    emitFlags |= 512 /* NoLeadingComments */;
                 }
             }
+            // `parameterName` is the declaration name used inside of the namespace.
             var parameterName = getNamespaceParameterName(node);
+            // `containerName` is the expression used inside of the namespace for exports.
             var containerName = getNamespaceContainerName(node);
-            var exportName = ts.hasModifier(node, 1)
-                ? ts.getExternalModuleOrNamespaceExportName(currentNamespaceContainerName, node, false, true)
-                : ts.getLocalName(node, false, true);
+            // `exportName` is the expression used within this node's container for any exported references.
+            var exportName = ts.hasModifier(node, 1 /* Export */)
+                ? ts.getExternalModuleOrNamespaceExportName(currentNamespaceContainerName, node, /*allowComments*/ false, /*allowSourceMaps*/ true)
+                : ts.getLocalName(node, /*allowComments*/ false, /*allowSourceMaps*/ true);
+            //  x || (x = {})
+            //  exports.x || (exports.x = {})
             var moduleArg = ts.createLogicalOr(exportName, ts.createAssignment(exportName, ts.createObjectLiteral()));
             if (hasNamespaceQualifiedExportName(node)) {
-                var localName = ts.getLocalName(node, false, true);
+                // `localName` is the expression used within this node's containing scope for any local references.
+                var localName = ts.getLocalName(node, /*allowComments*/ false, /*allowSourceMaps*/ true);
+                //  x = (exports.x || (exports.x = {}))
                 moduleArg = ts.createAssignment(localName, moduleArg);
             }
-            var moduleStatement = ts.createStatement(ts.createCall(ts.createFunctionExpression(undefined, undefined, undefined, undefined, [ts.createParameter(undefined, undefined, undefined, parameterName)], undefined, transformModuleBody(node, containerName)), undefined, [moduleArg]));
+            //  (function (x_1) {
+            //      x_1.y = ...;
+            //  })(x || (x = {}));
+            var moduleStatement = ts.createStatement(ts.createCall(ts.createFunctionExpression(
+            /*modifiers*/ undefined, 
+            /*asteriskToken*/ undefined, 
+            /*name*/ undefined, 
+            /*typeParameters*/ undefined, [ts.createParameter(/*decorators*/ undefined, /*modifiers*/ undefined, /*dotDotDotToken*/ undefined, parameterName)], 
+            /*type*/ undefined, transformModuleBody(node, containerName)), 
+            /*typeArguments*/ undefined, [moduleArg]));
             ts.setOriginalNode(moduleStatement, node);
             ts.setTextRange(moduleStatement, node);
             ts.setEmitFlags(moduleStatement, emitFlags);
             statements.push(moduleStatement);
+            // Add a DeclarationMarker for the namespace to preserve trailing comments and mark
+            // the end of the declaration.
             statements.push(ts.createEndOfDeclarationMarker(node));
             return statements;
         }
+        /**
+         * Transforms the body of a module declaration.
+         *
+         * @param node The module declaration node.
+         */
         function transformModuleBody(node, namespaceLocalName) {
             var savedCurrentNamespaceContainerName = currentNamespaceContainerName;
             var savedCurrentNamespace = currentNamespace;
@@ -50319,7 +63471,7 @@ var ts;
             var statementsLocation;
             var blockLocation;
             var body = node.body;
-            if (body.kind === 240) {
+            if (body.kind === 240 /* ModuleBlock */) {
                 saveStateAndInvoke(body, function (body) { return ts.addRange(statements, ts.visitNodes(body.statements, namespaceElementVisitor, ts.isStatement)); });
                 statementsLocation = body.statements;
                 blockLocation = body;
@@ -50341,76 +63493,172 @@ var ts;
             currentNamespaceContainerName = savedCurrentNamespaceContainerName;
             currentNamespace = savedCurrentNamespace;
             currentScopeFirstDeclarationsOfName = savedCurrentScopeFirstDeclarationsOfName;
-            var block = ts.createBlock(ts.setTextRange(ts.createNodeArray(statements), statementsLocation), true);
+            var block = ts.createBlock(ts.setTextRange(ts.createNodeArray(statements), 
+            /*location*/ statementsLocation), 
+            /*multiLine*/ true);
             ts.setTextRange(block, blockLocation);
-            if (body.kind !== 240) {
-                ts.setEmitFlags(block, ts.getEmitFlags(block) | 1536);
+            // namespace hello.hi.world {
+            //      function foo() {}
+            //
+            //      // TODO, blah
+            // }
+            //
+            // should be emitted as
+            //
+            // var hello;
+            // (function (hello) {
+            //     var hi;
+            //     (function (hi) {
+            //         var world;
+            //         (function (world) {
+            //             function foo() { }
+            //             // TODO, blah
+            //         })(world = hi.world || (hi.world = {}));
+            //     })(hi = hello.hi || (hello.hi = {}));
+            // })(hello || (hello = {}));
+            // We only want to emit comment on the namespace which contains block body itself, not the containing namespaces.
+            if (body.kind !== 240 /* ModuleBlock */) {
+                ts.setEmitFlags(block, ts.getEmitFlags(block) | 1536 /* NoComments */);
             }
             return block;
         }
         function getInnerMostModuleDeclarationFromDottedModule(moduleDeclaration) {
-            if (moduleDeclaration.body.kind === 239) {
+            if (moduleDeclaration.body.kind === 239 /* ModuleDeclaration */) {
                 var recursiveInnerModule = getInnerMostModuleDeclarationFromDottedModule(moduleDeclaration.body);
                 return recursiveInnerModule || moduleDeclaration.body;
             }
         }
+        /**
+         * Visits an import declaration, eliding it if it is not referenced.
+         *
+         * @param node The import declaration node.
+         */
         function visitImportDeclaration(node) {
             if (!node.importClause) {
+                // Do not elide a side-effect only import declaration.
+                //  import "foo";
                 return node;
             }
+            // Elide the declaration if the import clause was elided.
             var importClause = ts.visitNode(node.importClause, visitImportClause, ts.isImportClause);
             return importClause
-                ? ts.updateImportDeclaration(node, undefined, undefined, importClause, node.moduleSpecifier)
+                ? ts.updateImportDeclaration(node, 
+                /*decorators*/ undefined, 
+                /*modifiers*/ undefined, importClause, node.moduleSpecifier)
                 : undefined;
         }
+        /**
+         * Visits an import clause, eliding it if it is not referenced.
+         *
+         * @param node The import clause node.
+         */
         function visitImportClause(node) {
+            // Elide the import clause if we elide both its name and its named bindings.
             var name = resolver.isReferencedAliasDeclaration(node) ? node.name : undefined;
             var namedBindings = ts.visitNode(node.namedBindings, visitNamedImportBindings, ts.isNamedImportBindings);
             return (name || namedBindings) ? ts.updateImportClause(node, name, namedBindings) : undefined;
         }
+        /**
+         * Visits named import bindings, eliding it if it is not referenced.
+         *
+         * @param node The named import bindings node.
+         */
         function visitNamedImportBindings(node) {
-            if (node.kind === 246) {
+            if (node.kind === 246 /* NamespaceImport */) {
+                // Elide a namespace import if it is not referenced.
                 return resolver.isReferencedAliasDeclaration(node) ? node : undefined;
             }
             else {
+                // Elide named imports if all of its import specifiers are elided.
                 var elements = ts.visitNodes(node.elements, visitImportSpecifier, ts.isImportSpecifier);
                 return ts.some(elements) ? ts.updateNamedImports(node, elements) : undefined;
             }
         }
+        /**
+         * Visits an import specifier, eliding it if it is not referenced.
+         *
+         * @param node The import specifier node.
+         */
         function visitImportSpecifier(node) {
+            // Elide an import specifier if it is not referenced.
             return resolver.isReferencedAliasDeclaration(node) ? node : undefined;
         }
+        /**
+         * Visits an export assignment, eliding it if it does not contain a clause that resolves
+         * to a value.
+         *
+         * @param node The export assignment node.
+         */
         function visitExportAssignment(node) {
+            // Elide the export assignment if it does not reference a value.
             return resolver.isValueAliasDeclaration(node)
                 ? ts.visitEachChild(node, visitor, context)
                 : undefined;
         }
+        /**
+         * Visits an export declaration, eliding it if it does not contain a clause that resolves
+         * to a value.
+         *
+         * @param node The export declaration node.
+         */
         function visitExportDeclaration(node) {
             if (!node.exportClause) {
+                // Elide a star export if the module it references does not export a value.
                 return compilerOptions.isolatedModules || resolver.moduleExportsSomeValue(node.moduleSpecifier) ? node : undefined;
             }
             if (!resolver.isValueAliasDeclaration(node)) {
+                // Elide the export declaration if it does not export a value.
                 return undefined;
             }
+            // Elide the export declaration if all of its named exports are elided.
             var exportClause = ts.visitNode(node.exportClause, visitNamedExports, ts.isNamedExports);
             return exportClause
-                ? ts.updateExportDeclaration(node, undefined, undefined, exportClause, node.moduleSpecifier)
+                ? ts.updateExportDeclaration(node, 
+                /*decorators*/ undefined, 
+                /*modifiers*/ undefined, exportClause, node.moduleSpecifier)
                 : undefined;
         }
+        /**
+         * Visits named exports, eliding it if it does not contain an export specifier that
+         * resolves to a value.
+         *
+         * @param node The named exports node.
+         */
         function visitNamedExports(node) {
+            // Elide the named exports if all of its export specifiers were elided.
             var elements = ts.visitNodes(node.elements, visitExportSpecifier, ts.isExportSpecifier);
             return ts.some(elements) ? ts.updateNamedExports(node, elements) : undefined;
         }
+        /**
+         * Visits an export specifier, eliding it if it does not resolve to a value.
+         *
+         * @param node The export specifier node.
+         */
         function visitExportSpecifier(node) {
+            // Elide an export specifier if it does not reference a value.
             return resolver.isValueAliasDeclaration(node) ? node : undefined;
         }
+        /**
+         * Determines whether to emit an import equals declaration.
+         *
+         * @param node The import equals declaration node.
+         */
         function shouldEmitImportEqualsDeclaration(node) {
+            // preserve old compiler's behavior: emit 'var' for import declaration (even if we do not consider them referenced) when
+            // - current file is not external module
+            // - import declaration is top level and target is value imported by entity name
             return resolver.isReferencedAliasDeclaration(node)
                 || (!ts.isExternalModule(currentSourceFile)
                     && resolver.isTopLevelValueImportEqualsWithEntityName(node));
         }
+        /**
+         * Visits an import equals declaration.
+         *
+         * @param node The import equals declaration node.
+         */
         function visitImportEqualsDeclaration(node) {
             if (ts.isExternalModuleImportEqualsDeclaration(node)) {
+                // Elide external module `import=` if it is not referenced.
                 return resolver.isReferencedAliasDeclaration(node)
                     ? ts.visitEachChild(node, visitor, context)
                     : undefined;
@@ -50419,59 +63667,98 @@ var ts;
                 return undefined;
             }
             var moduleReference = ts.createExpressionFromEntityName(node.moduleReference);
-            ts.setEmitFlags(moduleReference, 1536 | 2048);
+            ts.setEmitFlags(moduleReference, 1536 /* NoComments */ | 2048 /* NoNestedComments */);
             if (isNamedExternalModuleExport(node) || !isExportOfNamespace(node)) {
+                //  export var ${name} = ${moduleReference};
+                //  var ${name} = ${moduleReference};
                 return ts.setOriginalNode(ts.setTextRange(ts.createVariableStatement(ts.visitNodes(node.modifiers, modifierVisitor, ts.isModifier), ts.createVariableDeclarationList([
-                    ts.setOriginalNode(ts.createVariableDeclaration(node.name, undefined, moduleReference), node)
+                    ts.setOriginalNode(ts.createVariableDeclaration(node.name, 
+                    /*type*/ undefined, moduleReference), node)
                 ])), node), node);
             }
             else {
+                // exports.${name} = ${moduleReference};
                 return ts.setOriginalNode(createNamespaceExport(node.name, moduleReference, node), node);
             }
         }
+        /**
+         * Gets a value indicating whether the node is exported from a namespace.
+         *
+         * @param node The node to test.
+         */
         function isExportOfNamespace(node) {
-            return currentNamespace !== undefined && ts.hasModifier(node, 1);
+            return currentNamespace !== undefined && ts.hasModifier(node, 1 /* Export */);
         }
+        /**
+         * Gets a value indicating whether the node is exported from an external module.
+         *
+         * @param node The node to test.
+         */
         function isExternalModuleExport(node) {
-            return currentNamespace === undefined && ts.hasModifier(node, 1);
+            return currentNamespace === undefined && ts.hasModifier(node, 1 /* Export */);
         }
+        /**
+         * Gets a value indicating whether the node is a named export from an external module.
+         *
+         * @param node The node to test.
+         */
         function isNamedExternalModuleExport(node) {
             return isExternalModuleExport(node)
-                && !ts.hasModifier(node, 512);
+                && !ts.hasModifier(node, 512 /* Default */);
         }
+        /**
+         * Gets a value indicating whether the node is the default export of an external module.
+         *
+         * @param node The node to test.
+         */
         function isDefaultExternalModuleExport(node) {
             return isExternalModuleExport(node)
-                && ts.hasModifier(node, 512);
+                && ts.hasModifier(node, 512 /* Default */);
         }
+        /**
+         * Creates a statement for the provided expression. This is used in calls to `map`.
+         */
         function expressionToStatement(expression) {
             return ts.createStatement(expression);
         }
         function addExportMemberAssignment(statements, node) {
-            var expression = ts.createAssignment(ts.getExternalModuleOrNamespaceExportName(currentNamespaceContainerName, node, false, true), ts.getLocalName(node));
+            var expression = ts.createAssignment(ts.getExternalModuleOrNamespaceExportName(currentNamespaceContainerName, node, /*allowComments*/ false, /*allowSourceMaps*/ true), ts.getLocalName(node));
             ts.setSourceMapRange(expression, ts.createRange(node.name ? node.name.pos : node.pos, node.end));
             var statement = ts.createStatement(expression);
             ts.setSourceMapRange(statement, ts.createRange(-1, node.end));
             statements.push(statement);
         }
         function createNamespaceExport(exportName, exportValue, location) {
-            return ts.setTextRange(ts.createStatement(ts.createAssignment(ts.getNamespaceMemberName(currentNamespaceContainerName, exportName, false, true), exportValue)), location);
+            return ts.setTextRange(ts.createStatement(ts.createAssignment(ts.getNamespaceMemberName(currentNamespaceContainerName, exportName, /*allowComments*/ false, /*allowSourceMaps*/ true), exportValue)), location);
         }
         function createNamespaceExportExpression(exportName, exportValue, location) {
             return ts.setTextRange(ts.createAssignment(getNamespaceMemberNameWithSourceMapsAndWithoutComments(exportName), exportValue), location);
         }
         function getNamespaceMemberNameWithSourceMapsAndWithoutComments(name) {
-            return ts.getNamespaceMemberName(currentNamespaceContainerName, name, false, true);
+            return ts.getNamespaceMemberName(currentNamespaceContainerName, name, /*allowComments*/ false, /*allowSourceMaps*/ true);
         }
+        /**
+         * Gets the declaration name used inside of a namespace or enum.
+         */
         function getNamespaceParameterName(node) {
             var name = ts.getGeneratedNameForNode(node);
             ts.setSourceMapRange(name, node.name);
             return name;
         }
+        /**
+         * Gets the expression used to refer to a namespace or enum within the body
+         * of its declaration.
+         */
         function getNamespaceContainerName(node) {
             return ts.getGeneratedNameForNode(node);
         }
+        /**
+         * Gets a local alias for a class declaration if it is a decorated class with an internal
+         * reference to the static side of the class. This is necessary to avoid issues with
+         * double-binding semantics for the class name.
+         */
         function getClassAliasIfNeeded(node) {
-            if (resolver.getNodeCheckFlags(node) & 8388608) {
+            if (resolver.getNodeCheckFlags(node) & 8388608 /* ClassWithConstructorReference */) {
                 enableSubstitutionForClassAliases();
                 var classAlias = ts.createUniqueName(node.name && !ts.isGeneratedIdentifier(node.name) ? ts.idText(node.name) : "default");
                 classAliases[ts.getOriginalNodeId(node)] = classAlias;
@@ -50483,56 +63770,75 @@ var ts;
             return ts.createPropertyAccess(ts.getDeclarationName(node), "prototype");
         }
         function getClassMemberPrefix(node, member) {
-            return ts.hasModifier(member, 32)
+            return ts.hasModifier(member, 32 /* Static */)
                 ? ts.getDeclarationName(node)
                 : getClassPrototype(node);
         }
         function enableSubstitutionForNonQualifiedEnumMembers() {
-            if ((enabledSubstitutions & 8) === 0) {
-                enabledSubstitutions |= 8;
-                context.enableSubstitution(71);
+            if ((enabledSubstitutions & 8 /* NonQualifiedEnumMembers */) === 0) {
+                enabledSubstitutions |= 8 /* NonQualifiedEnumMembers */;
+                context.enableSubstitution(71 /* Identifier */);
             }
         }
         function enableSubstitutionForClassAliases() {
-            if ((enabledSubstitutions & 1) === 0) {
-                enabledSubstitutions |= 1;
-                context.enableSubstitution(71);
+            if ((enabledSubstitutions & 1 /* ClassAliases */) === 0) {
+                enabledSubstitutions |= 1 /* ClassAliases */;
+                // We need to enable substitutions for identifiers. This allows us to
+                // substitute class names inside of a class declaration.
+                context.enableSubstitution(71 /* Identifier */);
+                // Keep track of class aliases.
                 classAliases = [];
             }
         }
         function enableSubstitutionForNamespaceExports() {
-            if ((enabledSubstitutions & 2) === 0) {
-                enabledSubstitutions |= 2;
-                context.enableSubstitution(71);
-                context.enableSubstitution(271);
-                context.enableEmitNotification(239);
+            if ((enabledSubstitutions & 2 /* NamespaceExports */) === 0) {
+                enabledSubstitutions |= 2 /* NamespaceExports */;
+                // We need to enable substitutions for identifiers and shorthand property assignments. This allows us to
+                // substitute the names of exported members of a namespace.
+                context.enableSubstitution(71 /* Identifier */);
+                context.enableSubstitution(271 /* ShorthandPropertyAssignment */);
+                // We need to be notified when entering and exiting namespaces.
+                context.enableEmitNotification(239 /* ModuleDeclaration */);
             }
         }
         function isTransformedModuleDeclaration(node) {
-            return ts.getOriginalNode(node).kind === 239;
+            return ts.getOriginalNode(node).kind === 239 /* ModuleDeclaration */;
         }
         function isTransformedEnumDeclaration(node) {
-            return ts.getOriginalNode(node).kind === 238;
+            return ts.getOriginalNode(node).kind === 238 /* EnumDeclaration */;
         }
+        /**
+         * Hook for node emit.
+         *
+         * @param hint A hint as to the intended usage of the node.
+         * @param node The node to emit.
+         * @param emit A callback used to emit the node in the printer.
+         */
         function onEmitNode(hint, node, emitCallback) {
             var savedApplicableSubstitutions = applicableSubstitutions;
             var savedCurrentSourceFile = currentSourceFile;
             if (ts.isSourceFile(node)) {
                 currentSourceFile = node;
             }
-            if (enabledSubstitutions & 2 && isTransformedModuleDeclaration(node)) {
-                applicableSubstitutions |= 2;
+            if (enabledSubstitutions & 2 /* NamespaceExports */ && isTransformedModuleDeclaration(node)) {
+                applicableSubstitutions |= 2 /* NamespaceExports */;
             }
-            if (enabledSubstitutions & 8 && isTransformedEnumDeclaration(node)) {
-                applicableSubstitutions |= 8;
+            if (enabledSubstitutions & 8 /* NonQualifiedEnumMembers */ && isTransformedEnumDeclaration(node)) {
+                applicableSubstitutions |= 8 /* NonQualifiedEnumMembers */;
             }
             previousOnEmitNode(hint, node, emitCallback);
             applicableSubstitutions = savedApplicableSubstitutions;
             currentSourceFile = savedCurrentSourceFile;
         }
+        /**
+         * Hooks node substitutions.
+         *
+         * @param hint A hint as to the intended usage of the node.
+         * @param node The node to substitute.
+         */
         function onSubstituteNode(hint, node) {
             node = previousOnSubstituteNode(hint, node);
-            if (hint === 1) {
+            if (hint === 1 /* Expression */) {
                 return substituteExpression(node);
             }
             else if (ts.isShorthandPropertyAssignment(node)) {
@@ -50541,10 +63847,12 @@ var ts;
             return node;
         }
         function substituteShorthandPropertyAssignment(node) {
-            if (enabledSubstitutions & 2) {
+            if (enabledSubstitutions & 2 /* NamespaceExports */) {
                 var name = node.name;
                 var exportedName = trySubstituteNamespaceExportedName(name);
                 if (exportedName) {
+                    // A shorthand property with an assignment initializer is probably part of a
+                    // destructuring assignment
                     if (node.objectAssignmentInitializer) {
                         var initializer = ts.createAssignment(exportedName, node.objectAssignmentInitializer);
                         return ts.setTextRange(ts.createPropertyAssignment(name, initializer), node);
@@ -50556,11 +63864,11 @@ var ts;
         }
         function substituteExpression(node) {
             switch (node.kind) {
-                case 71:
+                case 71 /* Identifier */:
                     return substituteExpressionIdentifier(node);
-                case 185:
+                case 185 /* PropertyAccessExpression */:
                     return substitutePropertyAccessExpression(node);
-                case 186:
+                case 186 /* ElementAccessExpression */:
                     return substituteElementAccessExpression(node);
             }
             return node;
@@ -50571,11 +63879,16 @@ var ts;
                 || node;
         }
         function trySubstituteClassAlias(node) {
-            if (enabledSubstitutions & 1) {
-                if (resolver.getNodeCheckFlags(node) & 16777216) {
+            if (enabledSubstitutions & 1 /* ClassAliases */) {
+                if (resolver.getNodeCheckFlags(node) & 16777216 /* ConstructorReferenceInClass */) {
+                    // Due to the emit for class decorators, any reference to the class from inside of the class body
+                    // must instead be rewritten to point to a temporary variable to avoid issues with the double-bind
+                    // behavior of class names in ES6.
+                    // Also, when emitting statics for class expressions, we must substitute a class alias for
+                    // constructor references in static property initializers.
                     var declaration = resolver.getReferencedValueDeclaration(node);
                     if (declaration) {
-                        var classAlias = classAliases[declaration.id];
+                        var classAlias = classAliases[declaration.id]; // TODO: GH#18217
                         if (classAlias) {
                             var clone_1 = ts.getSynthesizedClone(classAlias);
                             ts.setSourceMapRange(clone_1, node);
@@ -50588,13 +63901,17 @@ var ts;
             return undefined;
         }
         function trySubstituteNamespaceExportedName(node) {
+            // If this is explicitly a local name, do not substitute.
             if (enabledSubstitutions & applicableSubstitutions && !ts.isGeneratedIdentifier(node) && !ts.isLocalName(node)) {
-                var container = resolver.getReferencedExportContainer(node, false);
-                if (container && container.kind !== 274) {
-                    var substitute = (applicableSubstitutions & 2 && container.kind === 239) ||
-                        (applicableSubstitutions & 8 && container.kind === 238);
+                // If we are nested within a namespace declaration, we may need to qualifiy
+                // an identifier that is exported from a merged namespace.
+                var container = resolver.getReferencedExportContainer(node, /*prefixLocals*/ false);
+                if (container && container.kind !== 274 /* SourceFile */) {
+                    var substitute = (applicableSubstitutions & 2 /* NamespaceExports */ && container.kind === 239 /* ModuleDeclaration */) ||
+                        (applicableSubstitutions & 8 /* NonQualifiedEnumMembers */ && container.kind === 238 /* EnumDeclaration */);
                     if (substitute) {
-                        return ts.setTextRange(ts.createPropertyAccess(ts.getGeneratedNameForNode(container), node), node);
+                        return ts.setTextRange(ts.createPropertyAccess(ts.getGeneratedNameForNode(container), node), 
+                        /*location*/ node);
                     }
                 }
             }
@@ -50609,13 +63926,14 @@ var ts;
         function substituteConstantValue(node) {
             var constantValue = tryGetConstEnumValue(node);
             if (constantValue !== undefined) {
+                // track the constant value on the node for the printer in needsDotDotForPropertyAccess
                 ts.setConstantValue(node, constantValue);
                 var substitute = ts.createLiteral(constantValue);
                 if (!compilerOptions.removeComments) {
                     var propertyName = ts.isPropertyAccessExpression(node)
                         ? ts.declarationNameToString(node.name)
                         : ts.getTextOfNode(node.argumentExpression);
-                    ts.addSyntheticTrailingComment(substitute, 3, " " + propertyName + " ");
+                    ts.addSyntheticTrailingComment(substitute, 3 /* MultiLineCommentTrivia */, " " + propertyName + " ");
                 }
                 return substitute;
             }
@@ -50631,7 +63949,7 @@ var ts;
     ts.transformTypeScript = transformTypeScript;
     function createDecorateHelper(context, decoratorExpressions, target, memberName, descriptor, location) {
         var argumentsArray = [];
-        argumentsArray.push(ts.createArrayLiteral(decoratorExpressions, true));
+        argumentsArray.push(ts.createArrayLiteral(decoratorExpressions, /*multiLine*/ true));
         argumentsArray.push(target);
         if (memberName) {
             argumentsArray.push(memberName);
@@ -50640,7 +63958,8 @@ var ts;
             }
         }
         context.requestEmitHelper(decorateHelper);
-        return ts.setTextRange(ts.createCall(ts.getHelperName("__decorate"), undefined, argumentsArray), location);
+        return ts.setTextRange(ts.createCall(ts.getHelperName("__decorate"), 
+        /*typeArguments*/ undefined, argumentsArray), location);
     }
     var decorateHelper = {
         name: "typescript:decorate",
@@ -50650,7 +63969,8 @@ var ts;
     };
     function createMetadataHelper(context, metadataKey, metadataValue) {
         context.requestEmitHelper(metadataHelper);
-        return ts.createCall(ts.getHelperName("__metadata"), undefined, [
+        return ts.createCall(ts.getHelperName("__metadata"), 
+        /*typeArguments*/ undefined, [
             ts.createLiteral(metadataKey),
             metadataValue
         ]);
@@ -50663,7 +63983,8 @@ var ts;
     };
     function createParamHelper(context, expression, parameterOffset, location) {
         context.requestEmitHelper(paramHelper);
-        return ts.setTextRange(ts.createCall(ts.getHelperName("__param"), undefined, [
+        return ts.setTextRange(ts.createCall(ts.getHelperName("__param"), 
+        /*typeArguments*/ undefined, [
             ts.createLiteral(parameterOffset),
             expression
         ]), location);
@@ -50675,18 +63996,34 @@ var ts;
         text: "\n            var __param = (this && this.__param) || function (paramIndex, decorator) {\n                return function (target, key) { decorator(target, key, paramIndex); }\n            };"
     };
 })(ts || (ts = {}));
+/*@internal*/
 var ts;
 (function (ts) {
+    var ES2017SubstitutionFlags;
+    (function (ES2017SubstitutionFlags) {
+        /** Enables substitutions for async methods with `super` calls. */
+        ES2017SubstitutionFlags[ES2017SubstitutionFlags["AsyncMethodsWithSuper"] = 1] = "AsyncMethodsWithSuper";
+    })(ES2017SubstitutionFlags || (ES2017SubstitutionFlags = {}));
     function transformES2017(context) {
         var resumeLexicalEnvironment = context.resumeLexicalEnvironment, endLexicalEnvironment = context.endLexicalEnvironment, hoistVariableDeclaration = context.hoistVariableDeclaration;
         var resolver = context.getEmitResolver();
         var compilerOptions = context.getCompilerOptions();
         var languageVersion = ts.getEmitScriptTarget(compilerOptions);
+        /**
+         * Keeps track of whether expression substitution has been enabled for specific edge cases.
+         * They are persisted between each SourceFile transformation and should not be reset.
+         */
         var enabledSubstitutions;
+        /**
+         * This keeps track of containers where `super` is valid, for use with
+         * just-in-time substitution for `super` expressions inside of async methods.
+         */
         var enclosingSuperContainerFlags = 0;
         var enclosingFunctionParameterNames;
+        // Save the previous transformation hooks.
         var previousOnEmitNode = context.onEmitNode;
         var previousOnSubstituteNode = context.onSubstituteNode;
+        // Set new transformation hooks.
         context.onEmitNode = onEmitNode;
         context.onSubstituteNode = onSubstituteNode;
         return ts.chainBundle(transformSourceFile);
@@ -50699,21 +64036,22 @@ var ts;
             return visited;
         }
         function visitor(node) {
-            if ((node.transformFlags & 16) === 0) {
+            if ((node.transformFlags & 16 /* ContainsES2017 */) === 0) {
                 return node;
             }
             switch (node.kind) {
-                case 120:
+                case 120 /* AsyncKeyword */:
+                    // ES2017 async modifier should be elided for targets < ES2017
                     return undefined;
-                case 197:
+                case 197 /* AwaitExpression */:
                     return visitAwaitExpression(node);
-                case 154:
+                case 154 /* MethodDeclaration */:
                     return visitMethodDeclaration(node);
-                case 234:
+                case 234 /* FunctionDeclaration */:
                     return visitFunctionDeclaration(node);
-                case 192:
+                case 192 /* FunctionExpression */:
                     return visitFunctionExpression(node);
-                case 193:
+                case 193 /* ArrowFunction */:
                     return visitArrowFunction(node);
                 default:
                     return ts.visitEachChild(node, visitor, context);
@@ -50722,27 +64060,27 @@ var ts;
         function asyncBodyVisitor(node) {
             if (ts.isNodeWithPossibleHoistedDeclaration(node)) {
                 switch (node.kind) {
-                    case 214:
+                    case 214 /* VariableStatement */:
                         return visitVariableStatementInAsyncBody(node);
-                    case 220:
+                    case 220 /* ForStatement */:
                         return visitForStatementInAsyncBody(node);
-                    case 221:
+                    case 221 /* ForInStatement */:
                         return visitForInStatementInAsyncBody(node);
-                    case 222:
+                    case 222 /* ForOfStatement */:
                         return visitForOfStatementInAsyncBody(node);
-                    case 269:
+                    case 269 /* CatchClause */:
                         return visitCatchClauseInAsyncBody(node);
-                    case 213:
-                    case 227:
-                    case 241:
-                    case 266:
-                    case 267:
-                    case 230:
-                    case 218:
-                    case 219:
-                    case 217:
-                    case 226:
-                    case 228:
+                    case 213 /* Block */:
+                    case 227 /* SwitchStatement */:
+                    case 241 /* CaseBlock */:
+                    case 266 /* CaseClause */:
+                    case 267 /* DefaultClause */:
+                    case 230 /* TryStatement */:
+                    case 218 /* DoStatement */:
+                    case 219 /* WhileStatement */:
+                    case 217 /* IfStatement */:
+                    case 226 /* WithStatement */:
+                    case 228 /* LabeledStatement */:
                         return ts.visitEachChild(node, asyncBodyVisitor, context);
                     default:
                         return ts.Debug.assertNever(node, "Unhandled node.");
@@ -50752,7 +64090,8 @@ var ts;
         }
         function visitCatchClauseInAsyncBody(node) {
             var catchClauseNames = ts.createUnderscoreEscapedMap();
-            recordDeclarationName(node.variableDeclaration, catchClauseNames);
+            recordDeclarationName(node.variableDeclaration, catchClauseNames); // TODO: GH#18217
+            // names declared in a catch variable are block scoped
             var catchClauseUnshadowedNames;
             catchClauseNames.forEach(function (_, escapedName) {
                 if (enclosingFunctionParameterNames.has(escapedName)) {
@@ -50775,47 +64114,98 @@ var ts;
         }
         function visitVariableStatementInAsyncBody(node) {
             if (isVariableDeclarationListWithCollidingName(node.declarationList)) {
-                var expression = visitVariableDeclarationListWithCollidingNames(node.declarationList, false);
+                var expression = visitVariableDeclarationListWithCollidingNames(node.declarationList, /*hasReceiver*/ false);
                 return expression ? ts.createStatement(expression) : undefined;
             }
             return ts.visitEachChild(node, visitor, context);
         }
         function visitForInStatementInAsyncBody(node) {
             return ts.updateForIn(node, isVariableDeclarationListWithCollidingName(node.initializer)
-                ? visitVariableDeclarationListWithCollidingNames(node.initializer, true)
+                ? visitVariableDeclarationListWithCollidingNames(node.initializer, /*hasReceiver*/ true)
                 : ts.visitNode(node.initializer, visitor, ts.isForInitializer), ts.visitNode(node.expression, visitor, ts.isExpression), ts.visitNode(node.statement, asyncBodyVisitor, ts.isStatement, ts.liftToBlock));
         }
         function visitForOfStatementInAsyncBody(node) {
             return ts.updateForOf(node, ts.visitNode(node.awaitModifier, visitor, ts.isToken), isVariableDeclarationListWithCollidingName(node.initializer)
-                ? visitVariableDeclarationListWithCollidingNames(node.initializer, true)
+                ? visitVariableDeclarationListWithCollidingNames(node.initializer, /*hasReceiver*/ true)
                 : ts.visitNode(node.initializer, visitor, ts.isForInitializer), ts.visitNode(node.expression, visitor, ts.isExpression), ts.visitNode(node.statement, asyncBodyVisitor, ts.isStatement, ts.liftToBlock));
         }
         function visitForStatementInAsyncBody(node) {
-            var initializer = node.initializer;
+            var initializer = node.initializer; // TODO: GH#18217
             return ts.updateFor(node, isVariableDeclarationListWithCollidingName(initializer)
-                ? visitVariableDeclarationListWithCollidingNames(initializer, false)
+                ? visitVariableDeclarationListWithCollidingNames(initializer, /*hasReceiver*/ false)
                 : ts.visitNode(node.initializer, visitor, ts.isForInitializer), ts.visitNode(node.condition, visitor, ts.isExpression), ts.visitNode(node.incrementor, visitor, ts.isExpression), ts.visitNode(node.statement, asyncBodyVisitor, ts.isStatement, ts.liftToBlock));
         }
+        /**
+         * Visits an AwaitExpression node.
+         *
+         * This function will be called any time a ES2017 await expression is encountered.
+         *
+         * @param node The node to visit.
+         */
         function visitAwaitExpression(node) {
-            return ts.setOriginalNode(ts.setTextRange(ts.createYield(undefined, ts.visitNode(node.expression, visitor, ts.isExpression)), node), node);
+            return ts.setOriginalNode(ts.setTextRange(ts.createYield(
+            /*asteriskToken*/ undefined, ts.visitNode(node.expression, visitor, ts.isExpression)), node), node);
         }
+        /**
+         * Visits a MethodDeclaration node.
+         *
+         * This function will be called when one of the following conditions are met:
+         * - The node is marked as async
+         *
+         * @param node The node to visit.
+         */
         function visitMethodDeclaration(node) {
-            return ts.updateMethod(node, undefined, ts.visitNodes(node.modifiers, visitor, ts.isModifier), node.asteriskToken, node.name, undefined, undefined, ts.visitParameterList(node.parameters, visitor, context), undefined, ts.getFunctionFlags(node) & 2
+            return ts.updateMethod(node, 
+            /*decorators*/ undefined, ts.visitNodes(node.modifiers, visitor, ts.isModifier), node.asteriskToken, node.name, 
+            /*questionToken*/ undefined, 
+            /*typeParameters*/ undefined, ts.visitParameterList(node.parameters, visitor, context), 
+            /*type*/ undefined, ts.getFunctionFlags(node) & 2 /* Async */
                 ? transformAsyncFunctionBody(node)
                 : ts.visitFunctionBody(node.body, visitor, context));
         }
+        /**
+         * Visits a FunctionDeclaration node.
+         *
+         * This function will be called when one of the following conditions are met:
+         * - The node is marked async
+         *
+         * @param node The node to visit.
+         */
         function visitFunctionDeclaration(node) {
-            return ts.updateFunctionDeclaration(node, undefined, ts.visitNodes(node.modifiers, visitor, ts.isModifier), node.asteriskToken, node.name, undefined, ts.visitParameterList(node.parameters, visitor, context), undefined, ts.getFunctionFlags(node) & 2
+            return ts.updateFunctionDeclaration(node, 
+            /*decorators*/ undefined, ts.visitNodes(node.modifiers, visitor, ts.isModifier), node.asteriskToken, node.name, 
+            /*typeParameters*/ undefined, ts.visitParameterList(node.parameters, visitor, context), 
+            /*type*/ undefined, ts.getFunctionFlags(node) & 2 /* Async */
                 ? transformAsyncFunctionBody(node)
                 : ts.visitFunctionBody(node.body, visitor, context));
         }
+        /**
+         * Visits a FunctionExpression node.
+         *
+         * This function will be called when one of the following conditions are met:
+         * - The node is marked async
+         *
+         * @param node The node to visit.
+         */
         function visitFunctionExpression(node) {
-            return ts.updateFunctionExpression(node, ts.visitNodes(node.modifiers, visitor, ts.isModifier), node.asteriskToken, node.name, undefined, ts.visitParameterList(node.parameters, visitor, context), undefined, ts.getFunctionFlags(node) & 2
+            return ts.updateFunctionExpression(node, ts.visitNodes(node.modifiers, visitor, ts.isModifier), node.asteriskToken, node.name, 
+            /*typeParameters*/ undefined, ts.visitParameterList(node.parameters, visitor, context), 
+            /*type*/ undefined, ts.getFunctionFlags(node) & 2 /* Async */
                 ? transformAsyncFunctionBody(node)
                 : ts.visitFunctionBody(node.body, visitor, context));
         }
+        /**
+         * Visits an ArrowFunction.
+         *
+         * This function will be called when one of the following conditions are met:
+         * - The node is marked async
+         *
+         * @param node The node to visit.
+         */
         function visitArrowFunction(node) {
-            return ts.updateArrowFunction(node, ts.visitNodes(node.modifiers, visitor, ts.isModifier), undefined, ts.visitParameterList(node.parameters, visitor, context), undefined, node.equalsGreaterThanToken, ts.getFunctionFlags(node) & 2
+            return ts.updateArrowFunction(node, ts.visitNodes(node.modifiers, visitor, ts.isModifier), 
+            /*typeParameters*/ undefined, ts.visitParameterList(node.parameters, visitor, context), 
+            /*type*/ undefined, node.equalsGreaterThanToken, ts.getFunctionFlags(node) & 2 /* Async */
                 ? transformAsyncFunctionBody(node)
                 : ts.visitFunctionBody(node.body, visitor, context));
         }
@@ -50836,7 +64226,7 @@ var ts;
         function isVariableDeclarationListWithCollidingName(node) {
             return !!node
                 && ts.isVariableDeclarationList(node)
-                && !(node.flags & 3)
+                && !(node.flags & 3 /* BlockScoped */)
                 && node.declarations.some(collidesWithParameterName);
         }
         function visitVariableDeclarationListWithCollidingNames(node, hasReceiver) {
@@ -50890,9 +64280,14 @@ var ts;
             resumeLexicalEnvironment();
             var original = ts.getOriginalNode(node, ts.isFunctionLike);
             var nodeType = original.type;
-            var promiseConstructor = languageVersion < 2 ? getPromiseConstructor(nodeType) : undefined;
-            var isArrowFunction = node.kind === 193;
-            var hasLexicalArguments = (resolver.getNodeCheckFlags(node) & 8192) !== 0;
+            var promiseConstructor = languageVersion < 2 /* ES2015 */ ? getPromiseConstructor(nodeType) : undefined;
+            var isArrowFunction = node.kind === 193 /* ArrowFunction */;
+            var hasLexicalArguments = (resolver.getNodeCheckFlags(node) & 8192 /* CaptureArguments */) !== 0;
+            // An async function is emit as an outer function that calls an inner
+            // generator function. To preserve lexical bindings, we pass the current
+            // `this` and `arguments` objects to `__awaiter`. The generator function
+            // passed to `__awaiter` is executed inside of the callback to the
+            // promise constructor.
             var savedEnclosingFunctionParameterNames = enclosingFunctionParameterNames;
             enclosingFunctionParameterNames = ts.createUnderscoreEscapedMap();
             for (var _i = 0, _a = node.parameters; _i < _a.length; _i++) {
@@ -50902,17 +64297,19 @@ var ts;
             var result;
             if (!isArrowFunction) {
                 var statements = [];
-                var statementOffset = ts.addPrologue(statements, node.body.statements, false, visitor);
+                var statementOffset = ts.addPrologue(statements, node.body.statements, /*ensureUseStrict*/ false, visitor);
                 statements.push(ts.createReturn(createAwaiterHelper(context, hasLexicalArguments, promiseConstructor, transformAsyncFunctionBodyWorker(node.body, statementOffset))));
                 ts.prependStatements(statements, endLexicalEnvironment());
-                var block = ts.createBlock(statements, true);
+                var block = ts.createBlock(statements, /*multiLine*/ true);
                 ts.setTextRange(block, node.body);
-                if (languageVersion >= 2) {
-                    if (resolver.getNodeCheckFlags(node) & 4096) {
+                // Minor optimization, emit `_super` helper to capture `super` access in an arrow.
+                // This step isn't needed if we eventually transform this to ES5.
+                if (languageVersion >= 2 /* ES2015 */) {
+                    if (resolver.getNodeCheckFlags(node) & 4096 /* AsyncMethodWithSuperBinding */) {
                         enableSubstitutionForAsyncMethodsWithSuper();
                         ts.addEmitHelper(block, ts.advancedAsyncSuperHelper);
                     }
-                    else if (resolver.getNodeCheckFlags(node) & 2048) {
+                    else if (resolver.getNodeCheckFlags(node) & 2048 /* AsyncMethodWithSuper */) {
                         enableSubstitutionForAsyncMethodsWithSuper();
                         ts.addEmitHelper(block, ts.asyncSuperHelper);
                     }
@@ -50953,21 +64350,33 @@ var ts;
             return undefined;
         }
         function enableSubstitutionForAsyncMethodsWithSuper() {
-            if ((enabledSubstitutions & 1) === 0) {
-                enabledSubstitutions |= 1;
-                context.enableSubstitution(187);
-                context.enableSubstitution(185);
-                context.enableSubstitution(186);
-                context.enableEmitNotification(235);
-                context.enableEmitNotification(154);
-                context.enableEmitNotification(156);
-                context.enableEmitNotification(157);
-                context.enableEmitNotification(155);
+            if ((enabledSubstitutions & 1 /* AsyncMethodsWithSuper */) === 0) {
+                enabledSubstitutions |= 1 /* AsyncMethodsWithSuper */;
+                // We need to enable substitutions for call, property access, and element access
+                // if we need to rewrite super calls.
+                context.enableSubstitution(187 /* CallExpression */);
+                context.enableSubstitution(185 /* PropertyAccessExpression */);
+                context.enableSubstitution(186 /* ElementAccessExpression */);
+                // We need to be notified when entering and exiting declarations that bind super.
+                context.enableEmitNotification(235 /* ClassDeclaration */);
+                context.enableEmitNotification(154 /* MethodDeclaration */);
+                context.enableEmitNotification(156 /* GetAccessor */);
+                context.enableEmitNotification(157 /* SetAccessor */);
+                context.enableEmitNotification(155 /* Constructor */);
             }
         }
+        /**
+         * Hook for node emit.
+         *
+         * @param hint A hint as to the intended usage of the node.
+         * @param node The node to emit.
+         * @param emit A callback used to emit the node in the printer.
+         */
         function onEmitNode(hint, node, emitCallback) {
-            if (enabledSubstitutions & 1 && isSuperContainer(node)) {
-                var superContainerFlags = resolver.getNodeCheckFlags(node) & (2048 | 4096);
+            // If we need to support substitutions for `super` in an async method,
+            // we should track it here.
+            if (enabledSubstitutions & 1 /* AsyncMethodsWithSuper */ && isSuperContainer(node)) {
+                var superContainerFlags = resolver.getNodeCheckFlags(node) & (2048 /* AsyncMethodWithSuper */ | 4096 /* AsyncMethodWithSuperBinding */);
                 if (superContainerFlags !== enclosingSuperContainerFlags) {
                     var savedEnclosingSuperContainerFlags = enclosingSuperContainerFlags;
                     enclosingSuperContainerFlags = superContainerFlags;
@@ -50978,32 +64387,38 @@ var ts;
             }
             previousOnEmitNode(hint, node, emitCallback);
         }
+        /**
+         * Hooks node substitutions.
+         *
+         * @param hint A hint as to the intended usage of the node.
+         * @param node The node to substitute.
+         */
         function onSubstituteNode(hint, node) {
             node = previousOnSubstituteNode(hint, node);
-            if (hint === 1 && enclosingSuperContainerFlags) {
+            if (hint === 1 /* Expression */ && enclosingSuperContainerFlags) {
                 return substituteExpression(node);
             }
             return node;
         }
         function substituteExpression(node) {
             switch (node.kind) {
-                case 185:
+                case 185 /* PropertyAccessExpression */:
                     return substitutePropertyAccessExpression(node);
-                case 186:
+                case 186 /* ElementAccessExpression */:
                     return substituteElementAccessExpression(node);
-                case 187:
+                case 187 /* CallExpression */:
                     return substituteCallExpression(node);
             }
             return node;
         }
         function substitutePropertyAccessExpression(node) {
-            if (node.expression.kind === 97) {
+            if (node.expression.kind === 97 /* SuperKeyword */) {
                 return createSuperAccessInAsyncMethod(ts.createLiteral(ts.idText(node.name)), node);
             }
             return node;
         }
         function substituteElementAccessExpression(node) {
-            if (node.expression.kind === 97) {
+            if (node.expression.kind === 97 /* SuperKeyword */) {
                 return createSuperAccessInAsyncMethod(node.argumentExpression, node);
             }
             return node;
@@ -51014,7 +64429,8 @@ var ts;
                 var argumentExpression = ts.isPropertyAccessExpression(expression)
                     ? substitutePropertyAccessExpression(expression)
                     : substituteElementAccessExpression(expression);
-                return ts.createCall(ts.createPropertyAccess(argumentExpression, "call"), undefined, [
+                return ts.createCall(ts.createPropertyAccess(argumentExpression, "call"), 
+                /*typeArguments*/ undefined, [
                     ts.createThis()
                 ].concat(node.arguments));
             }
@@ -51022,18 +64438,20 @@ var ts;
         }
         function isSuperContainer(node) {
             var kind = node.kind;
-            return kind === 235
-                || kind === 155
-                || kind === 154
-                || kind === 156
-                || kind === 157;
+            return kind === 235 /* ClassDeclaration */
+                || kind === 155 /* Constructor */
+                || kind === 154 /* MethodDeclaration */
+                || kind === 156 /* GetAccessor */
+                || kind === 157 /* SetAccessor */;
         }
         function createSuperAccessInAsyncMethod(argumentExpression, location) {
-            if (enclosingSuperContainerFlags & 4096) {
-                return ts.setTextRange(ts.createPropertyAccess(ts.createCall(ts.createFileLevelUniqueName("_super"), undefined, [argumentExpression]), "value"), location);
+            if (enclosingSuperContainerFlags & 4096 /* AsyncMethodWithSuperBinding */) {
+                return ts.setTextRange(ts.createPropertyAccess(ts.createCall(ts.createFileLevelUniqueName("_super"), 
+                /*typeArguments*/ undefined, [argumentExpression]), "value"), location);
             }
             else {
-                return ts.setTextRange(ts.createCall(ts.createFileLevelUniqueName("_super"), undefined, [argumentExpression]), location);
+                return ts.setTextRange(ts.createCall(ts.createFileLevelUniqueName("_super"), 
+                /*typeArguments*/ undefined, [argumentExpression]), location);
             }
         }
     }
@@ -51046,9 +64464,16 @@ var ts;
     };
     function createAwaiterHelper(context, hasLexicalArguments, promiseConstructor, body) {
         context.requestEmitHelper(awaiterHelper);
-        var generatorFunc = ts.createFunctionExpression(undefined, ts.createToken(39), undefined, undefined, [], undefined, body);
-        (generatorFunc.emitNode || (generatorFunc.emitNode = {})).flags |= 262144 | 524288;
-        return ts.createCall(ts.getHelperName("__awaiter"), undefined, [
+        var generatorFunc = ts.createFunctionExpression(
+        /*modifiers*/ undefined, ts.createToken(39 /* AsteriskToken */), 
+        /*name*/ undefined, 
+        /*typeParameters*/ undefined, 
+        /*parameters*/ [], 
+        /*type*/ undefined, body);
+        // Mark this node as originally an async function
+        (generatorFunc.emitNode || (generatorFunc.emitNode = {})).flags |= 262144 /* AsyncFunctionBody */ | 524288 /* ReuseTempVariableScope */;
+        return ts.createCall(ts.getHelperName("__awaiter"), 
+        /*typeArguments*/ undefined, [
             ts.createThis(),
             hasLexicalArguments ? ts.createIdentifier("arguments") : ts.createVoidZero(),
             promiseConstructor ? ts.createExpressionFromEntityName(promiseConstructor) : ts.createVoidZero(),
@@ -51066,8 +64491,14 @@ var ts;
         text: ts.helperString(__makeTemplateObject(["\n            const ", " = (function (geti, seti) {\n                const cache = Object.create(null);\n                return name => cache[name] || (cache[name] = { get value() { return geti(name); }, set value(v) { seti(name, v); } });\n            })(name => super[name], (name, value) => super[name] = value);"], ["\n            const ", " = (function (geti, seti) {\n                const cache = Object.create(null);\n                return name => cache[name] || (cache[name] = { get value() { return geti(name); }, set value(v) { seti(name, v); } });\n            })(name => super[name], (name, value) => super[name] = value);"]), "_super")
     };
 })(ts || (ts = {}));
+/*@internal*/
 var ts;
 (function (ts) {
+    var ESNextSubstitutionFlags;
+    (function (ESNextSubstitutionFlags) {
+        /** Enables substitutions for async methods with `super` calls. */
+        ESNextSubstitutionFlags[ESNextSubstitutionFlags["AsyncMethodsWithSuper"] = 1] = "AsyncMethodsWithSuper";
+    })(ESNextSubstitutionFlags || (ESNextSubstitutionFlags = {}));
     function transformESNext(context) {
         var resumeLexicalEnvironment = context.resumeLexicalEnvironment, endLexicalEnvironment = context.endLexicalEnvironment, hoistVariableDeclaration = context.hoistVariableDeclaration;
         var resolver = context.getEmitResolver();
@@ -51090,76 +64521,77 @@ var ts;
             return visited;
         }
         function visitor(node) {
-            return visitorWorker(node, false);
+            return visitorWorker(node, /*noDestructuringValue*/ false);
         }
         function visitorNoDestructuringValue(node) {
-            return visitorWorker(node, true);
+            return visitorWorker(node, /*noDestructuringValue*/ true);
         }
         function visitorNoAsyncModifier(node) {
-            if (node.kind === 120) {
+            if (node.kind === 120 /* AsyncKeyword */) {
                 return undefined;
             }
             return node;
         }
         function visitorWorker(node, noDestructuringValue) {
-            if ((node.transformFlags & 8) === 0) {
+            if ((node.transformFlags & 8 /* ContainsESNext */) === 0) {
                 return node;
             }
             switch (node.kind) {
-                case 197:
+                case 197 /* AwaitExpression */:
                     return visitAwaitExpression(node);
-                case 203:
+                case 203 /* YieldExpression */:
                     return visitYieldExpression(node);
-                case 225:
+                case 225 /* ReturnStatement */:
                     return visitReturnStatement(node);
-                case 228:
+                case 228 /* LabeledStatement */:
                     return visitLabeledStatement(node);
-                case 184:
+                case 184 /* ObjectLiteralExpression */:
                     return visitObjectLiteralExpression(node);
-                case 200:
+                case 200 /* BinaryExpression */:
                     return visitBinaryExpression(node, noDestructuringValue);
-                case 232:
+                case 232 /* VariableDeclaration */:
                     return visitVariableDeclaration(node);
-                case 222:
-                    return visitForOfStatement(node, undefined);
-                case 220:
+                case 222 /* ForOfStatement */:
+                    return visitForOfStatement(node, /*outermostLabeledStatement*/ undefined);
+                case 220 /* ForStatement */:
                     return visitForStatement(node);
-                case 196:
+                case 196 /* VoidExpression */:
                     return visitVoidExpression(node);
-                case 155:
+                case 155 /* Constructor */:
                     return visitConstructorDeclaration(node);
-                case 154:
+                case 154 /* MethodDeclaration */:
                     return visitMethodDeclaration(node);
-                case 156:
+                case 156 /* GetAccessor */:
                     return visitGetAccessorDeclaration(node);
-                case 157:
+                case 157 /* SetAccessor */:
                     return visitSetAccessorDeclaration(node);
-                case 234:
+                case 234 /* FunctionDeclaration */:
                     return visitFunctionDeclaration(node);
-                case 192:
+                case 192 /* FunctionExpression */:
                     return visitFunctionExpression(node);
-                case 193:
+                case 193 /* ArrowFunction */:
                     return visitArrowFunction(node);
-                case 149:
+                case 149 /* Parameter */:
                     return visitParameter(node);
-                case 216:
+                case 216 /* ExpressionStatement */:
                     return visitExpressionStatement(node);
-                case 191:
+                case 191 /* ParenthesizedExpression */:
                     return visitParenthesizedExpression(node, noDestructuringValue);
-                case 269:
+                case 269 /* CatchClause */:
                     return visitCatchClause(node);
                 default:
                     return ts.visitEachChild(node, visitor, context);
             }
         }
         function visitAwaitExpression(node) {
-            if (enclosingFunctionFlags & 2 && enclosingFunctionFlags & 1) {
-                return ts.setOriginalNode(ts.setTextRange(ts.createYield(createAwaitHelper(context, ts.visitNode(node.expression, visitor, ts.isExpression))), node), node);
+            if (enclosingFunctionFlags & 2 /* Async */ && enclosingFunctionFlags & 1 /* Generator */) {
+                return ts.setOriginalNode(ts.setTextRange(ts.createYield(createAwaitHelper(context, ts.visitNode(node.expression, visitor, ts.isExpression))), 
+                /*location*/ node), node);
             }
             return ts.visitEachChild(node, visitor, context);
         }
         function visitYieldExpression(node) {
-            if (enclosingFunctionFlags & 2 && enclosingFunctionFlags & 1) {
+            if (enclosingFunctionFlags & 2 /* Async */ && enclosingFunctionFlags & 1 /* Generator */) {
                 if (node.asteriskToken) {
                     var expression = ts.visitNode(node.expression, visitor, ts.isExpression);
                     return ts.setOriginalNode(ts.setTextRange(ts.createYield(createAwaitHelper(context, ts.updateYield(node, node.asteriskToken, createAsyncDelegatorHelper(context, createAsyncValuesHelper(context, expression, expression), expression)))), node), node);
@@ -51171,15 +64603,15 @@ var ts;
             return ts.visitEachChild(node, visitor, context);
         }
         function visitReturnStatement(node) {
-            if (enclosingFunctionFlags & 2 && enclosingFunctionFlags & 1) {
+            if (enclosingFunctionFlags & 2 /* Async */ && enclosingFunctionFlags & 1 /* Generator */) {
                 return ts.updateReturn(node, createDownlevelAwait(node.expression ? ts.visitNode(node.expression, visitor, ts.isExpression) : ts.createVoidZero()));
             }
             return ts.visitEachChild(node, visitor, context);
         }
         function visitLabeledStatement(node) {
-            if (enclosingFunctionFlags & 2) {
+            if (enclosingFunctionFlags & 2 /* Async */) {
                 var statement = ts.unwrapInnermostStatementOfLabel(node);
-                if (statement.kind === 222 && statement.awaitModifier) {
+                if (statement.kind === 222 /* ForOfStatement */ && statement.awaitModifier) {
                     return visitForOfStatement(statement, node);
                 }
                 return ts.restoreEnclosingLabel(ts.visitEachChild(statement, visitor, context), node);
@@ -51191,7 +64623,7 @@ var ts;
             var objects = [];
             for (var _i = 0, elements_4 = elements; _i < elements_4.length; _i++) {
                 var e = elements_4[_i];
-                if (e.kind === 272) {
+                if (e.kind === 272 /* SpreadAssignment */) {
                     if (chunkObject) {
                         objects.push(ts.createObjectLiteral(chunkObject));
                         chunkObject = undefined;
@@ -51200,7 +64632,7 @@ var ts;
                     objects.push(ts.visitNode(target, visitor, ts.isExpression));
                 }
                 else {
-                    chunkObject = ts.append(chunkObject, e.kind === 270
+                    chunkObject = ts.append(chunkObject, e.kind === 270 /* PropertyAssignment */
                         ? ts.createPropertyAssignment(e.name, ts.visitNode(e.initializer, visitor, ts.isExpression))
                         : ts.visitNode(e, visitor, ts.isObjectLiteralElementLike));
                 }
@@ -51211,9 +64643,14 @@ var ts;
             return objects;
         }
         function visitObjectLiteralExpression(node) {
-            if (node.transformFlags & 1048576) {
+            if (node.transformFlags & 1048576 /* ContainsObjectSpread */) {
+                // spread elements emit like so:
+                // non-spread elements are chunked together into object literals, and then all are passed to __assign:
+                //     { a, ...o, b } => __assign({a}, o, {b});
+                // If the first element is a spread element, then the first argument to __assign is {}:
+                //     { ...o, a, b, ...o2 } => __assign({}, o, {a, b}, o2)
                 var objects = chunkObjectLiteralElements(node.properties);
-                if (objects.length && objects[0].kind !== 184) {
+                if (objects.length && objects[0].kind !== 184 /* ObjectLiteralExpression */) {
                     objects.unshift(ts.createObjectLiteral());
                 }
                 return createAssignHelper(context, objects);
@@ -51228,22 +64665,33 @@ var ts;
         }
         function visitCatchClause(node) {
             if (!node.variableDeclaration) {
-                return ts.updateCatchClause(node, ts.createVariableDeclaration(ts.createTempVariable(undefined)), ts.visitNode(node.block, visitor, ts.isBlock));
+                return ts.updateCatchClause(node, ts.createVariableDeclaration(ts.createTempVariable(/*recordTempVariable*/ undefined)), ts.visitNode(node.block, visitor, ts.isBlock));
             }
             return ts.visitEachChild(node, visitor, context);
         }
+        /**
+         * Visits a BinaryExpression that contains a destructuring assignment.
+         *
+         * @param node A BinaryExpression node.
+         */
         function visitBinaryExpression(node, noDestructuringValue) {
-            if (ts.isDestructuringAssignment(node) && node.left.transformFlags & 1048576) {
-                return ts.flattenDestructuringAssignment(node, visitor, context, 1, !noDestructuringValue);
+            if (ts.isDestructuringAssignment(node) && node.left.transformFlags & 1048576 /* ContainsObjectRest */) {
+                return ts.flattenDestructuringAssignment(node, visitor, context, 1 /* ObjectRest */, !noDestructuringValue);
             }
-            else if (node.operatorToken.kind === 26) {
+            else if (node.operatorToken.kind === 26 /* CommaToken */) {
                 return ts.updateBinary(node, ts.visitNode(node.left, visitorNoDestructuringValue, ts.isExpression), ts.visitNode(node.right, noDestructuringValue ? visitorNoDestructuringValue : visitor, ts.isExpression));
             }
             return ts.visitEachChild(node, visitor, context);
         }
+        /**
+         * Visits a VariableDeclaration node with a binding pattern.
+         *
+         * @param node A VariableDeclaration node.
+         */
         function visitVariableDeclaration(node) {
-            if (ts.isBindingPattern(node.name) && node.name.transformFlags & 1048576) {
-                return ts.flattenDestructuringBinding(node, visitor, context, 1);
+            // If we are here it is because the name contains a binding pattern with a rest somewhere in it.
+            if (ts.isBindingPattern(node.name) && node.name.transformFlags & 1048576 /* ContainsObjectRest */) {
+                return ts.flattenDestructuringBinding(node, visitor, context, 1 /* ObjectRest */);
             }
             return ts.visitEachChild(node, visitor, context);
         }
@@ -51253,8 +64701,13 @@ var ts;
         function visitVoidExpression(node) {
             return ts.visitEachChild(node, visitorNoDestructuringValue, context);
         }
+        /**
+         * Visits a ForOfStatement and converts it into a ES2015-compatible ForOfStatement.
+         *
+         * @param node A ForOfStatement.
+         */
         function visitForOfStatement(node, outermostLabeledStatement) {
-            if (node.initializer.transformFlags & 1048576) {
+            if (node.initializer.transformFlags & 1048576 /* ContainsObjectRest */) {
                 node = transformForOfStatementWithObjectRest(node);
             }
             if (node.awaitModifier) {
@@ -51269,7 +64722,7 @@ var ts;
             if (ts.isVariableDeclarationList(initializerWithoutParens) || ts.isAssignmentPattern(initializerWithoutParens)) {
                 var bodyLocation = void 0;
                 var statementsLocation = void 0;
-                var temp = ts.createTempVariable(undefined);
+                var temp = ts.createTempVariable(/*recordTempVariable*/ undefined);
                 var statements = [ts.createForOfBindingStatement(initializerWithoutParens, temp)];
                 if (ts.isBlock(node.statement)) {
                     ts.addRange(statements, node.statement.statements);
@@ -51283,7 +64736,8 @@ var ts;
                 }
                 return ts.updateForOf(node, node.awaitModifier, ts.setTextRange(ts.createVariableDeclarationList([
                     ts.setTextRange(ts.createVariableDeclaration(temp), node.initializer)
-                ], 1), node.initializer), node.expression, ts.setTextRange(ts.createBlock(ts.setTextRange(ts.createNodeArray(statements), statementsLocation), true), bodyLocation));
+                ], 1 /* Let */), node.initializer), node.expression, ts.setTextRange(ts.createBlock(ts.setTextRange(ts.createNodeArray(statements), statementsLocation), 
+                /*multiLine*/ true), bodyLocation));
             }
             return node;
         }
@@ -51301,80 +64755,102 @@ var ts;
             else {
                 statements.push(statement);
             }
-            return ts.setEmitFlags(ts.setTextRange(ts.createBlock(ts.setTextRange(ts.createNodeArray(statements), statementsLocation), true), bodyLocation), 48 | 384);
+            return ts.setEmitFlags(ts.setTextRange(ts.createBlock(ts.setTextRange(ts.createNodeArray(statements), statementsLocation), 
+            /*multiLine*/ true), bodyLocation), 48 /* NoSourceMap */ | 384 /* NoTokenSourceMaps */);
         }
         function createDownlevelAwait(expression) {
-            return enclosingFunctionFlags & 1
-                ? ts.createYield(undefined, createAwaitHelper(context, expression))
+            return enclosingFunctionFlags & 1 /* Generator */
+                ? ts.createYield(/*asteriskToken*/ undefined, createAwaitHelper(context, expression))
                 : ts.createAwait(expression);
         }
         function transformForAwaitOfStatement(node, outermostLabeledStatement) {
             var expression = ts.visitNode(node.expression, visitor, ts.isExpression);
-            var iterator = ts.isIdentifier(expression) ? ts.getGeneratedNameForNode(expression) : ts.createTempVariable(undefined);
-            var result = ts.isIdentifier(expression) ? ts.getGeneratedNameForNode(iterator) : ts.createTempVariable(undefined);
+            var iterator = ts.isIdentifier(expression) ? ts.getGeneratedNameForNode(expression) : ts.createTempVariable(/*recordTempVariable*/ undefined);
+            var result = ts.isIdentifier(expression) ? ts.getGeneratedNameForNode(iterator) : ts.createTempVariable(/*recordTempVariable*/ undefined);
             var errorRecord = ts.createUniqueName("e");
             var catchVariable = ts.getGeneratedNameForNode(errorRecord);
-            var returnMethod = ts.createTempVariable(undefined);
-            var callValues = createAsyncValuesHelper(context, expression, node.expression);
-            var callNext = ts.createCall(ts.createPropertyAccess(iterator, "next"), undefined, []);
+            var returnMethod = ts.createTempVariable(/*recordTempVariable*/ undefined);
+            var callValues = createAsyncValuesHelper(context, expression, /*location*/ node.expression);
+            var callNext = ts.createCall(ts.createPropertyAccess(iterator, "next"), /*typeArguments*/ undefined, []);
             var getDone = ts.createPropertyAccess(result, "done");
             var getValue = ts.createPropertyAccess(result, "value");
             var callReturn = ts.createFunctionCall(returnMethod, iterator, []);
             hoistVariableDeclaration(errorRecord);
             hoistVariableDeclaration(returnMethod);
-            var forStatement = ts.setEmitFlags(ts.setTextRange(ts.createFor(ts.setEmitFlags(ts.setTextRange(ts.createVariableDeclarationList([
-                ts.setTextRange(ts.createVariableDeclaration(iterator, undefined, callValues), node.expression),
+            var forStatement = ts.setEmitFlags(ts.setTextRange(ts.createFor(
+            /*initializer*/ ts.setEmitFlags(ts.setTextRange(ts.createVariableDeclarationList([
+                ts.setTextRange(ts.createVariableDeclaration(iterator, /*type*/ undefined, callValues), node.expression),
                 ts.createVariableDeclaration(result)
-            ]), node.expression), 2097152), ts.createComma(ts.createAssignment(result, createDownlevelAwait(callNext)), ts.createLogicalNot(getDone)), undefined, convertForOfStatementHead(node, getValue)), node), 256);
+            ]), node.expression), 2097152 /* NoHoisting */), 
+            /*condition*/ ts.createComma(ts.createAssignment(result, createDownlevelAwait(callNext)), ts.createLogicalNot(getDone)), 
+            /*incrementor*/ undefined, 
+            /*statement*/ convertForOfStatementHead(node, getValue)), 
+            /*location*/ node), 256 /* NoTokenTrailingSourceMaps */);
             return ts.createTry(ts.createBlock([
                 ts.restoreEnclosingLabel(forStatement, outermostLabeledStatement)
             ]), ts.createCatchClause(ts.createVariableDeclaration(catchVariable), ts.setEmitFlags(ts.createBlock([
                 ts.createStatement(ts.createAssignment(errorRecord, ts.createObjectLiteral([
                     ts.createPropertyAssignment("error", catchVariable)
                 ])))
-            ]), 1)), ts.createBlock([
-                ts.createTry(ts.createBlock([
-                    ts.setEmitFlags(ts.createIf(ts.createLogicalAnd(ts.createLogicalAnd(result, ts.createLogicalNot(getDone)), ts.createAssignment(returnMethod, ts.createPropertyAccess(iterator, "return"))), ts.createStatement(createDownlevelAwait(callReturn))), 1)
-                ]), undefined, ts.setEmitFlags(ts.createBlock([
-                    ts.setEmitFlags(ts.createIf(errorRecord, ts.createThrow(ts.createPropertyAccess(errorRecord, "error"))), 1)
-                ]), 1))
+            ]), 1 /* SingleLine */)), ts.createBlock([
+                ts.createTry(
+                /*tryBlock*/ ts.createBlock([
+                    ts.setEmitFlags(ts.createIf(ts.createLogicalAnd(ts.createLogicalAnd(result, ts.createLogicalNot(getDone)), ts.createAssignment(returnMethod, ts.createPropertyAccess(iterator, "return"))), ts.createStatement(createDownlevelAwait(callReturn))), 1 /* SingleLine */)
+                ]), 
+                /*catchClause*/ undefined, 
+                /*finallyBlock*/ ts.setEmitFlags(ts.createBlock([
+                    ts.setEmitFlags(ts.createIf(errorRecord, ts.createThrow(ts.createPropertyAccess(errorRecord, "error"))), 1 /* SingleLine */)
+                ]), 1 /* SingleLine */))
             ]));
         }
         function visitParameter(node) {
-            if (node.transformFlags & 1048576) {
-                return ts.updateParameter(node, undefined, undefined, node.dotDotDotToken, ts.getGeneratedNameForNode(node), undefined, undefined, ts.visitNode(node.initializer, visitor, ts.isExpression));
+            if (node.transformFlags & 1048576 /* ContainsObjectRest */) {
+                // Binding patterns are converted into a generated name and are
+                // evaluated inside the function body.
+                return ts.updateParameter(node, 
+                /*decorators*/ undefined, 
+                /*modifiers*/ undefined, node.dotDotDotToken, ts.getGeneratedNameForNode(node), 
+                /*questionToken*/ undefined, 
+                /*type*/ undefined, ts.visitNode(node.initializer, visitor, ts.isExpression));
             }
             return ts.visitEachChild(node, visitor, context);
         }
         function visitConstructorDeclaration(node) {
             var savedEnclosingFunctionFlags = enclosingFunctionFlags;
-            enclosingFunctionFlags = 0;
-            var updated = ts.updateConstructor(node, undefined, node.modifiers, ts.visitParameterList(node.parameters, visitor, context), transformFunctionBody(node));
+            enclosingFunctionFlags = 0 /* Normal */;
+            var updated = ts.updateConstructor(node, 
+            /*decorators*/ undefined, node.modifiers, ts.visitParameterList(node.parameters, visitor, context), transformFunctionBody(node));
             enclosingFunctionFlags = savedEnclosingFunctionFlags;
             return updated;
         }
         function visitGetAccessorDeclaration(node) {
             var savedEnclosingFunctionFlags = enclosingFunctionFlags;
-            enclosingFunctionFlags = 0;
-            var updated = ts.updateGetAccessor(node, undefined, node.modifiers, ts.visitNode(node.name, visitor, ts.isPropertyName), ts.visitParameterList(node.parameters, visitor, context), undefined, transformFunctionBody(node));
+            enclosingFunctionFlags = 0 /* Normal */;
+            var updated = ts.updateGetAccessor(node, 
+            /*decorators*/ undefined, node.modifiers, ts.visitNode(node.name, visitor, ts.isPropertyName), ts.visitParameterList(node.parameters, visitor, context), 
+            /*type*/ undefined, transformFunctionBody(node));
             enclosingFunctionFlags = savedEnclosingFunctionFlags;
             return updated;
         }
         function visitSetAccessorDeclaration(node) {
             var savedEnclosingFunctionFlags = enclosingFunctionFlags;
-            enclosingFunctionFlags = 0;
-            var updated = ts.updateSetAccessor(node, undefined, node.modifiers, ts.visitNode(node.name, visitor, ts.isPropertyName), ts.visitParameterList(node.parameters, visitor, context), transformFunctionBody(node));
+            enclosingFunctionFlags = 0 /* Normal */;
+            var updated = ts.updateSetAccessor(node, 
+            /*decorators*/ undefined, node.modifiers, ts.visitNode(node.name, visitor, ts.isPropertyName), ts.visitParameterList(node.parameters, visitor, context), transformFunctionBody(node));
             enclosingFunctionFlags = savedEnclosingFunctionFlags;
             return updated;
         }
         function visitMethodDeclaration(node) {
             var savedEnclosingFunctionFlags = enclosingFunctionFlags;
             enclosingFunctionFlags = ts.getFunctionFlags(node);
-            var updated = ts.updateMethod(node, undefined, enclosingFunctionFlags & 1
+            var updated = ts.updateMethod(node, 
+            /*decorators*/ undefined, enclosingFunctionFlags & 1 /* Generator */
                 ? ts.visitNodes(node.modifiers, visitorNoAsyncModifier, ts.isModifier)
-                : node.modifiers, enclosingFunctionFlags & 2
+                : node.modifiers, enclosingFunctionFlags & 2 /* Async */
                 ? undefined
-                : node.asteriskToken, ts.visitNode(node.name, visitor, ts.isPropertyName), ts.visitNode(undefined, visitor, ts.isToken), undefined, ts.visitParameterList(node.parameters, visitor, context), undefined, enclosingFunctionFlags & 2 && enclosingFunctionFlags & 1
+                : node.asteriskToken, ts.visitNode(node.name, visitor, ts.isPropertyName), ts.visitNode(/*questionToken*/ undefined, visitor, ts.isToken), 
+            /*typeParameters*/ undefined, ts.visitParameterList(node.parameters, visitor, context), 
+            /*type*/ undefined, enclosingFunctionFlags & 2 /* Async */ && enclosingFunctionFlags & 1 /* Generator */
                 ? transformAsyncGeneratorFunctionBody(node)
                 : transformFunctionBody(node));
             enclosingFunctionFlags = savedEnclosingFunctionFlags;
@@ -51383,11 +64859,14 @@ var ts;
         function visitFunctionDeclaration(node) {
             var savedEnclosingFunctionFlags = enclosingFunctionFlags;
             enclosingFunctionFlags = ts.getFunctionFlags(node);
-            var updated = ts.updateFunctionDeclaration(node, undefined, enclosingFunctionFlags & 1
+            var updated = ts.updateFunctionDeclaration(node, 
+            /*decorators*/ undefined, enclosingFunctionFlags & 1 /* Generator */
                 ? ts.visitNodes(node.modifiers, visitorNoAsyncModifier, ts.isModifier)
-                : node.modifiers, enclosingFunctionFlags & 2
+                : node.modifiers, enclosingFunctionFlags & 2 /* Async */
                 ? undefined
-                : node.asteriskToken, node.name, undefined, ts.visitParameterList(node.parameters, visitor, context), undefined, enclosingFunctionFlags & 2 && enclosingFunctionFlags & 1
+                : node.asteriskToken, node.name, 
+            /*typeParameters*/ undefined, ts.visitParameterList(node.parameters, visitor, context), 
+            /*type*/ undefined, enclosingFunctionFlags & 2 /* Async */ && enclosingFunctionFlags & 1 /* Generator */
                 ? transformAsyncGeneratorFunctionBody(node)
                 : transformFunctionBody(node));
             enclosingFunctionFlags = savedEnclosingFunctionFlags;
@@ -51396,18 +64875,22 @@ var ts;
         function visitArrowFunction(node) {
             var savedEnclosingFunctionFlags = enclosingFunctionFlags;
             enclosingFunctionFlags = ts.getFunctionFlags(node);
-            var updated = ts.updateArrowFunction(node, node.modifiers, undefined, ts.visitParameterList(node.parameters, visitor, context), undefined, node.equalsGreaterThanToken, transformFunctionBody(node));
+            var updated = ts.updateArrowFunction(node, node.modifiers, 
+            /*typeParameters*/ undefined, ts.visitParameterList(node.parameters, visitor, context), 
+            /*type*/ undefined, node.equalsGreaterThanToken, transformFunctionBody(node));
             enclosingFunctionFlags = savedEnclosingFunctionFlags;
             return updated;
         }
         function visitFunctionExpression(node) {
             var savedEnclosingFunctionFlags = enclosingFunctionFlags;
             enclosingFunctionFlags = ts.getFunctionFlags(node);
-            var updated = ts.updateFunctionExpression(node, enclosingFunctionFlags & 1
+            var updated = ts.updateFunctionExpression(node, enclosingFunctionFlags & 1 /* Generator */
                 ? ts.visitNodes(node.modifiers, visitorNoAsyncModifier, ts.isModifier)
-                : node.modifiers, enclosingFunctionFlags & 2
+                : node.modifiers, enclosingFunctionFlags & 2 /* Async */
                 ? undefined
-                : node.asteriskToken, node.name, undefined, ts.visitParameterList(node.parameters, visitor, context), undefined, enclosingFunctionFlags & 2 && enclosingFunctionFlags & 1
+                : node.asteriskToken, node.name, 
+            /*typeParameters*/ undefined, ts.visitParameterList(node.parameters, visitor, context), 
+            /*type*/ undefined, enclosingFunctionFlags & 2 /* Async */ && enclosingFunctionFlags & 1 /* Generator */
                 ? transformAsyncGeneratorFunctionBody(node)
                 : transformFunctionBody(node));
             enclosingFunctionFlags = savedEnclosingFunctionFlags;
@@ -51416,17 +64899,23 @@ var ts;
         function transformAsyncGeneratorFunctionBody(node) {
             resumeLexicalEnvironment();
             var statements = [];
-            var statementOffset = ts.addPrologue(statements, node.body.statements, false, visitor);
+            var statementOffset = ts.addPrologue(statements, node.body.statements, /*ensureUseStrict*/ false, visitor);
             appendObjectRestAssignmentsIfNeeded(statements, node);
-            statements.push(ts.createReturn(createAsyncGeneratorHelper(context, ts.createFunctionExpression(undefined, ts.createToken(39), node.name && ts.getGeneratedNameForNode(node.name), undefined, [], undefined, ts.updateBlock(node.body, ts.visitLexicalEnvironment(node.body.statements, visitor, context, statementOffset))))));
+            statements.push(ts.createReturn(createAsyncGeneratorHelper(context, ts.createFunctionExpression(
+            /*modifiers*/ undefined, ts.createToken(39 /* AsteriskToken */), node.name && ts.getGeneratedNameForNode(node.name), 
+            /*typeParameters*/ undefined, 
+            /*parameters*/ [], 
+            /*type*/ undefined, ts.updateBlock(node.body, ts.visitLexicalEnvironment(node.body.statements, visitor, context, statementOffset))))));
             ts.prependStatements(statements, endLexicalEnvironment());
             var block = ts.updateBlock(node.body, statements);
-            if (languageVersion >= 2) {
-                if (resolver.getNodeCheckFlags(node) & 4096) {
+            // Minor optimization, emit `_super` helper to capture `super` access in an arrow.
+            // This step isn't needed if we eventually transform this to ES5.
+            if (languageVersion >= 2 /* ES2015 */) {
+                if (resolver.getNodeCheckFlags(node) & 4096 /* AsyncMethodWithSuperBinding */) {
                     enableSubstitutionForAsyncMethodsWithSuper();
                     ts.addEmitHelper(block, ts.advancedAsyncSuperHelper);
                 }
-                else if (resolver.getNodeCheckFlags(node) & 2048) {
+                else if (resolver.getNodeCheckFlags(node) & 2048 /* AsyncMethodWithSuper */) {
                     enableSubstitutionForAsyncMethodsWithSuper();
                     ts.addEmitHelper(block, ts.asyncSuperHelper);
                 }
@@ -51439,12 +64928,12 @@ var ts;
             var statements = [];
             var body = ts.visitNode(node.body, visitor, ts.isConciseBody);
             if (ts.isBlock(body)) {
-                statementOffset = ts.addPrologue(statements, body.statements, false, visitor);
+                statementOffset = ts.addPrologue(statements, body.statements, /*ensureUseStrict*/ false, visitor);
             }
-            ts.addRange(statements, appendObjectRestAssignmentsIfNeeded(undefined, node));
+            ts.addRange(statements, appendObjectRestAssignmentsIfNeeded(/*statements*/ undefined, node));
             var leadingStatements = endLexicalEnvironment();
             if (statementOffset > 0 || ts.some(statements) || ts.some(leadingStatements)) {
-                var block = ts.convertToFunctionBody(body, true);
+                var block = ts.convertToFunctionBody(body, /*multiLine*/ true);
                 ts.prependStatements(statements, leadingStatements);
                 ts.addRange(statements, block.statements.slice(statementOffset));
                 return ts.updateBlock(block, ts.setTextRange(ts.createNodeArray(statements), block.statements));
@@ -51454,12 +64943,15 @@ var ts;
         function appendObjectRestAssignmentsIfNeeded(statements, node) {
             for (var _i = 0, _a = node.parameters; _i < _a.length; _i++) {
                 var parameter = _a[_i];
-                if (parameter.transformFlags & 1048576) {
+                if (parameter.transformFlags & 1048576 /* ContainsObjectRest */) {
                     var temp = ts.getGeneratedNameForNode(parameter);
-                    var declarations = ts.flattenDestructuringBinding(parameter, visitor, context, 1, temp, false, true);
+                    var declarations = ts.flattenDestructuringBinding(parameter, visitor, context, 1 /* ObjectRest */, temp, 
+                    /*doNotRecordTempVariablesInLine*/ false, 
+                    /*skipInitializer*/ true);
                     if (ts.some(declarations)) {
-                        var statement = ts.createVariableStatement(undefined, ts.createVariableDeclarationList(declarations));
-                        ts.setEmitFlags(statement, 1048576);
+                        var statement = ts.createVariableStatement(
+                        /*modifiers*/ undefined, ts.createVariableDeclarationList(declarations));
+                        ts.setEmitFlags(statement, 1048576 /* CustomPrologue */);
                         statements = ts.append(statements, statement);
                     }
                 }
@@ -51467,21 +64959,33 @@ var ts;
             return statements;
         }
         function enableSubstitutionForAsyncMethodsWithSuper() {
-            if ((enabledSubstitutions & 1) === 0) {
-                enabledSubstitutions |= 1;
-                context.enableSubstitution(187);
-                context.enableSubstitution(185);
-                context.enableSubstitution(186);
-                context.enableEmitNotification(235);
-                context.enableEmitNotification(154);
-                context.enableEmitNotification(156);
-                context.enableEmitNotification(157);
-                context.enableEmitNotification(155);
+            if ((enabledSubstitutions & 1 /* AsyncMethodsWithSuper */) === 0) {
+                enabledSubstitutions |= 1 /* AsyncMethodsWithSuper */;
+                // We need to enable substitutions for call, property access, and element access
+                // if we need to rewrite super calls.
+                context.enableSubstitution(187 /* CallExpression */);
+                context.enableSubstitution(185 /* PropertyAccessExpression */);
+                context.enableSubstitution(186 /* ElementAccessExpression */);
+                // We need to be notified when entering and exiting declarations that bind super.
+                context.enableEmitNotification(235 /* ClassDeclaration */);
+                context.enableEmitNotification(154 /* MethodDeclaration */);
+                context.enableEmitNotification(156 /* GetAccessor */);
+                context.enableEmitNotification(157 /* SetAccessor */);
+                context.enableEmitNotification(155 /* Constructor */);
             }
         }
+        /**
+         * Called by the printer just before a node is printed.
+         *
+         * @param hint A hint as to the intended usage of the node.
+         * @param node The node to be printed.
+         * @param emitCallback The callback used to emit the node.
+         */
         function onEmitNode(hint, node, emitCallback) {
-            if (enabledSubstitutions & 1 && isSuperContainer(node)) {
-                var superContainerFlags = resolver.getNodeCheckFlags(node) & (2048 | 4096);
+            // If we need to support substitutions for `super` in an async method,
+            // we should track it here.
+            if (enabledSubstitutions & 1 /* AsyncMethodsWithSuper */ && isSuperContainer(node)) {
+                var superContainerFlags = resolver.getNodeCheckFlags(node) & (2048 /* AsyncMethodWithSuper */ | 4096 /* AsyncMethodWithSuperBinding */);
                 if (superContainerFlags !== enclosingSuperContainerFlags) {
                     var savedEnclosingSuperContainerFlags = enclosingSuperContainerFlags;
                     enclosingSuperContainerFlags = superContainerFlags;
@@ -51492,32 +64996,38 @@ var ts;
             }
             previousOnEmitNode(hint, node, emitCallback);
         }
+        /**
+         * Hooks node substitutions.
+         *
+         * @param hint The context for the emitter.
+         * @param node The node to substitute.
+         */
         function onSubstituteNode(hint, node) {
             node = previousOnSubstituteNode(hint, node);
-            if (hint === 1 && enclosingSuperContainerFlags) {
+            if (hint === 1 /* Expression */ && enclosingSuperContainerFlags) {
                 return substituteExpression(node);
             }
             return node;
         }
         function substituteExpression(node) {
             switch (node.kind) {
-                case 185:
+                case 185 /* PropertyAccessExpression */:
                     return substitutePropertyAccessExpression(node);
-                case 186:
+                case 186 /* ElementAccessExpression */:
                     return substituteElementAccessExpression(node);
-                case 187:
+                case 187 /* CallExpression */:
                     return substituteCallExpression(node);
             }
             return node;
         }
         function substitutePropertyAccessExpression(node) {
-            if (node.expression.kind === 97) {
+            if (node.expression.kind === 97 /* SuperKeyword */) {
                 return createSuperAccessInAsyncMethod(ts.createLiteral(ts.idText(node.name)), node);
             }
             return node;
         }
         function substituteElementAccessExpression(node) {
-            if (node.expression.kind === 97) {
+            if (node.expression.kind === 97 /* SuperKeyword */) {
                 return createSuperAccessInAsyncMethod(node.argumentExpression, node);
             }
             return node;
@@ -51528,7 +65038,8 @@ var ts;
                 var argumentExpression = ts.isPropertyAccessExpression(expression)
                     ? substitutePropertyAccessExpression(expression)
                     : substituteElementAccessExpression(expression);
-                return ts.createCall(ts.createPropertyAccess(argumentExpression, "call"), undefined, [
+                return ts.createCall(ts.createPropertyAccess(argumentExpression, "call"), 
+                /*typeArguments*/ undefined, [
                     ts.createThis()
                 ].concat(node.arguments));
             }
@@ -51536,18 +65047,20 @@ var ts;
         }
         function isSuperContainer(node) {
             var kind = node.kind;
-            return kind === 235
-                || kind === 155
-                || kind === 154
-                || kind === 156
-                || kind === 157;
+            return kind === 235 /* ClassDeclaration */
+                || kind === 155 /* Constructor */
+                || kind === 154 /* MethodDeclaration */
+                || kind === 156 /* GetAccessor */
+                || kind === 157 /* SetAccessor */;
         }
         function createSuperAccessInAsyncMethod(argumentExpression, location) {
-            if (enclosingSuperContainerFlags & 4096) {
-                return ts.setTextRange(ts.createPropertyAccess(ts.createCall(ts.createIdentifier("_super"), undefined, [argumentExpression]), "value"), location);
+            if (enclosingSuperContainerFlags & 4096 /* AsyncMethodWithSuperBinding */) {
+                return ts.setTextRange(ts.createPropertyAccess(ts.createCall(ts.createIdentifier("_super"), 
+                /*typeArguments*/ undefined, [argumentExpression]), "value"), location);
             }
             else {
-                return ts.setTextRange(ts.createCall(ts.createIdentifier("_super"), undefined, [argumentExpression]), location);
+                return ts.setTextRange(ts.createCall(ts.createIdentifier("_super"), 
+                /*typeArguments*/ undefined, [argumentExpression]), location);
             }
         }
     }
@@ -51559,11 +65072,13 @@ var ts;
         text: "\n            var __assign = (this && this.__assign) || Object.assign || function(t) {\n                for (var s, i = 1, n = arguments.length; i < n; i++) {\n                    s = arguments[i];\n                    for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))\n                        t[p] = s[p];\n                }\n                return t;\n            };"
     };
     function createAssignHelper(context, attributesSegments) {
-        if (context.getCompilerOptions().target >= 2) {
-            return ts.createCall(ts.createPropertyAccess(ts.createIdentifier("Object"), "assign"), undefined, attributesSegments);
+        if (context.getCompilerOptions().target >= 2 /* ES2015 */) {
+            return ts.createCall(ts.createPropertyAccess(ts.createIdentifier("Object"), "assign"), 
+            /*typeArguments*/ undefined, attributesSegments);
         }
         context.requestEmitHelper(assignHelper);
-        return ts.createCall(ts.getHelperName("__assign"), undefined, attributesSegments);
+        return ts.createCall(ts.getHelperName("__assign"), 
+        /*typeArguments*/ undefined, attributesSegments);
     }
     ts.createAssignHelper = createAssignHelper;
     var awaitHelper = {
@@ -51573,7 +65088,7 @@ var ts;
     };
     function createAwaitHelper(context, expression) {
         context.requestEmitHelper(awaitHelper);
-        return ts.createCall(ts.getHelperName("__await"), undefined, [expression]);
+        return ts.createCall(ts.getHelperName("__await"), /*typeArguments*/ undefined, [expression]);
     }
     var asyncGeneratorHelper = {
         name: "typescript:asyncGenerator",
@@ -51583,8 +65098,10 @@ var ts;
     function createAsyncGeneratorHelper(context, generatorFunc) {
         context.requestEmitHelper(awaitHelper);
         context.requestEmitHelper(asyncGeneratorHelper);
-        (generatorFunc.emitNode || (generatorFunc.emitNode = {})).flags |= 262144;
-        return ts.createCall(ts.getHelperName("__asyncGenerator"), undefined, [
+        // Mark this node as originally an async function
+        (generatorFunc.emitNode || (generatorFunc.emitNode = {})).flags |= 262144 /* AsyncFunctionBody */;
+        return ts.createCall(ts.getHelperName("__asyncGenerator"), 
+        /*typeArguments*/ undefined, [
             ts.createThis(),
             ts.createIdentifier("arguments"),
             generatorFunc
@@ -51598,7 +65115,8 @@ var ts;
     function createAsyncDelegatorHelper(context, expression, location) {
         context.requestEmitHelper(awaitHelper);
         context.requestEmitHelper(asyncDelegator);
-        return ts.setTextRange(ts.createCall(ts.getHelperName("__asyncDelegator"), undefined, [expression]), location);
+        return ts.setTextRange(ts.createCall(ts.getHelperName("__asyncDelegator"), 
+        /*typeArguments*/ undefined, [expression]), location);
     }
     var asyncValues = {
         name: "typescript:asyncValues",
@@ -51607,15 +65125,22 @@ var ts;
     };
     function createAsyncValuesHelper(context, expression, location) {
         context.requestEmitHelper(asyncValues);
-        return ts.setTextRange(ts.createCall(ts.getHelperName("__asyncValues"), undefined, [expression]), location);
+        return ts.setTextRange(ts.createCall(ts.getHelperName("__asyncValues"), 
+        /*typeArguments*/ undefined, [expression]), location);
     }
 })(ts || (ts = {}));
+/*@internal*/
 var ts;
 (function (ts) {
     function transformJsx(context) {
         var compilerOptions = context.getCompilerOptions();
         var currentSourceFile;
         return ts.chainBundle(transformSourceFile);
+        /**
+         * Transform JSX-specific syntax in a SourceFile.
+         *
+         * @param node A SourceFile node.
+         */
         function transformSourceFile(node) {
             if (node.isDeclarationFile) {
                 return node;
@@ -51626,7 +65151,7 @@ var ts;
             return visited;
         }
         function visitor(node) {
-            if (node.transformFlags & 4) {
+            if (node.transformFlags & 4 /* ContainsJsx */) {
                 return visitorWorker(node);
             }
             else {
@@ -51635,13 +65160,13 @@ var ts;
         }
         function visitorWorker(node) {
             switch (node.kind) {
-                case 255:
-                    return visitJsxElement(node, false);
-                case 256:
-                    return visitJsxSelfClosingElement(node, false);
-                case 259:
-                    return visitJsxFragment(node, false);
-                case 265:
+                case 255 /* JsxElement */:
+                    return visitJsxElement(node, /*isChild*/ false);
+                case 256 /* JsxSelfClosingElement */:
+                    return visitJsxSelfClosingElement(node, /*isChild*/ false);
+                case 259 /* JsxFragment */:
+                    return visitJsxFragment(node, /*isChild*/ false);
+                case 265 /* JsxExpression */:
                     return visitJsxExpression(node);
                 default:
                     return ts.visitEachChild(node, visitor, context);
@@ -51649,56 +65174,65 @@ var ts;
         }
         function transformJsxChildToExpression(node) {
             switch (node.kind) {
-                case 10:
+                case 10 /* JsxText */:
                     return visitJsxText(node);
-                case 265:
+                case 265 /* JsxExpression */:
                     return visitJsxExpression(node);
-                case 255:
-                    return visitJsxElement(node, true);
-                case 256:
-                    return visitJsxSelfClosingElement(node, true);
-                case 259:
-                    return visitJsxFragment(node, true);
+                case 255 /* JsxElement */:
+                    return visitJsxElement(node, /*isChild*/ true);
+                case 256 /* JsxSelfClosingElement */:
+                    return visitJsxSelfClosingElement(node, /*isChild*/ true);
+                case 259 /* JsxFragment */:
+                    return visitJsxFragment(node, /*isChild*/ true);
                 default:
                     return ts.Debug.failBadSyntaxKind(node);
             }
         }
         function visitJsxElement(node, isChild) {
-            return visitJsxOpeningLikeElement(node.openingElement, node.children, isChild, node);
+            return visitJsxOpeningLikeElement(node.openingElement, node.children, isChild, /*location*/ node);
         }
         function visitJsxSelfClosingElement(node, isChild) {
-            return visitJsxOpeningLikeElement(node, undefined, isChild, node);
+            return visitJsxOpeningLikeElement(node, /*children*/ undefined, isChild, /*location*/ node);
         }
         function visitJsxFragment(node, isChild) {
-            return visitJsxOpeningFragment(node.openingFragment, node.children, isChild, node);
+            return visitJsxOpeningFragment(node.openingFragment, node.children, isChild, /*location*/ node);
         }
         function visitJsxOpeningLikeElement(node, children, isChild, location) {
             var tagName = getTagName(node);
             var objectProperties;
             var attrs = node.attributes.properties;
             if (attrs.length === 0) {
+                // When there are no attributes, React wants "null"
                 objectProperties = ts.createNull();
             }
             else {
+                // Map spans of JsxAttribute nodes into object literals and spans
+                // of JsxSpreadAttribute nodes into expressions.
                 var segments = ts.flatten(ts.spanMap(attrs, ts.isJsxSpreadAttribute, function (attrs, isSpread) { return isSpread
                     ? ts.map(attrs, transformJsxSpreadAttributeToExpression)
                     : ts.createObjectLiteral(ts.map(attrs, transformJsxAttributeToObjectLiteralElement)); }));
                 if (ts.isJsxSpreadAttribute(attrs[0])) {
+                    // We must always emit at least one object literal before a spread
+                    // argument.
                     segments.unshift(ts.createObjectLiteral());
                 }
+                // Either emit one big object literal (no spread attribs), or
+                // a call to the __assign helper.
                 objectProperties = ts.singleOrUndefined(segments);
                 if (!objectProperties) {
                     objectProperties = ts.createAssignHelper(context, segments);
                 }
             }
-            var element = ts.createExpressionForJsxElement(context.getEmitResolver().getJsxFactoryEntity(currentSourceFile), compilerOptions.reactNamespace, tagName, objectProperties, ts.mapDefined(children, transformJsxChildToExpression), node, location);
+            var element = ts.createExpressionForJsxElement(context.getEmitResolver().getJsxFactoryEntity(currentSourceFile), compilerOptions.reactNamespace, // TODO: GH#18217
+            tagName, objectProperties, ts.mapDefined(children, transformJsxChildToExpression), node, location);
             if (isChild) {
                 ts.startOnNewLine(element);
             }
             return element;
         }
         function visitJsxOpeningFragment(node, children, isChild, location) {
-            var element = ts.createExpressionForJsxFragment(context.getEmitResolver().getJsxFactoryEntity(currentSourceFile), compilerOptions.reactNamespace, ts.mapDefined(children, transformJsxChildToExpression), node, location);
+            var element = ts.createExpressionForJsxFragment(context.getEmitResolver().getJsxFactoryEntity(currentSourceFile), compilerOptions.reactNamespace, // TODO: GH#18217
+            ts.mapDefined(children, transformJsxChildToExpression), node, location);
             if (isChild) {
                 ts.startOnNewLine(element);
             }
@@ -51716,12 +65250,14 @@ var ts;
             if (node === undefined) {
                 return ts.createTrue();
             }
-            else if (node.kind === 9) {
+            else if (node.kind === 9 /* StringLiteral */) {
+                // Always recreate the literal to escape any escape sequences or newlines which may be in the original jsx string and which
+                // Need to be escaped to be handled correctly in a normal string
                 var literal = ts.createLiteral(tryDecodeEntities(node.text) || node.text);
                 literal.singleQuote = node.singleQuote !== undefined ? node.singleQuote : !ts.isStringDoubleQuoted(node, currentSourceFile);
                 return ts.setTextRange(literal, node);
             }
-            else if (node.kind === 265) {
+            else if (node.kind === 265 /* JsxExpression */) {
                 if (node.expression === undefined) {
                     return ts.createTrue();
                 }
@@ -51732,19 +65268,43 @@ var ts;
             }
         }
         function visitJsxText(node) {
-            var fixed = fixupWhitespaceAndDecodeEntities(ts.getTextOfNode(node, true));
+            var fixed = fixupWhitespaceAndDecodeEntities(ts.getTextOfNode(node, /*includeTrivia*/ true));
             return fixed === undefined ? undefined : ts.createLiteral(fixed);
         }
+        /**
+         * JSX trims whitespace at the end and beginning of lines, except that the
+         * start/end of a tag is considered a start/end of a line only if that line is
+         * on the same line as the closing tag. See examples in
+         * tests/cases/conformance/jsx/tsxReactEmitWhitespace.tsx
+         * See also https://www.w3.org/TR/html4/struct/text.html#h-9.1 and https://www.w3.org/TR/CSS2/text.html#white-space-model
+         *
+         * An equivalent algorithm would be:
+         * - If there is only one line, return it.
+         * - If there is only whitespace (but multiple lines), return `undefined`.
+         * - Split the text into lines.
+         * - 'trimRight' the first line, 'trimLeft' the last line, 'trim' middle lines.
+         * - Decode entities on each line (individually).
+         * - Remove empty lines and join the rest with " ".
+         */
         function fixupWhitespaceAndDecodeEntities(text) {
             var acc;
+            // First non-whitespace character on this line.
             var firstNonWhitespace = 0;
+            // Last non-whitespace character on this line.
             var lastNonWhitespace = -1;
+            // These initial values are special because the first line is:
+            // firstNonWhitespace = 0 to indicate that we want leading whitsepace,
+            // but lastNonWhitespace = -1 as a special flag to indicate that we *don't* include the line if it's all whitespace.
             for (var i = 0; i < text.length; i++) {
                 var c = text.charCodeAt(i);
                 if (ts.isLineBreak(c)) {
+                    // If we've seen any non-whitespace characters on this line, add the 'trim' of the line.
+                    // (lastNonWhitespace === -1 is a special flag to detect whether the first line is all whitespace.)
                     if (firstNonWhitespace !== -1 && lastNonWhitespace !== -1) {
                         acc = addLineOfJsxText(acc, text.substr(firstNonWhitespace, lastNonWhitespace - firstNonWhitespace + 1));
                     }
+                    // Reset firstNonWhitespace for the next line.
+                    // Don't bother to reset lastNonWhitespace because we ignore it if firstNonWhitespace = -1.
                     firstNonWhitespace = -1;
                 }
                 else if (!ts.isWhiteSpaceSingleLine(c)) {
@@ -51755,13 +65315,21 @@ var ts;
                 }
             }
             return firstNonWhitespace !== -1
+                // Last line had a non-whitespace character. Emit the 'trimLeft', meaning keep trailing whitespace.
                 ? addLineOfJsxText(acc, text.substr(firstNonWhitespace))
+                // Last line was all whitespace, so ignore it
                 : acc;
         }
         function addLineOfJsxText(acc, trimmedLine) {
+            // We do not escape the string here as that is handled by the printer
+            // when it emits the literal. We do, however, need to decode JSX entities.
             var decoded = decodeEntities(trimmedLine);
             return acc === undefined ? decoded : acc + " " + decoded;
         }
+        /**
+         * Replace entities like "&nbsp;", "&#123;", and "&#xDEADBEEF;" with the characters they encode.
+         * See https://en.wikipedia.org/wiki/List_of_XML_and_HTML_character_entity_references
+         */
         function decodeEntities(text) {
             return text.replace(/&((#((\d+)|x([\da-fA-F]+)))|(\w+));/g, function (match, _all, _number, _digits, decimal, hex, word) {
                 if (decimal) {
@@ -51772,16 +65340,18 @@ var ts;
                 }
                 else {
                     var ch = entities.get(word);
+                    // If this is not a valid entity, then just use `match` (replace it with itself, i.e. don't replace)
                     return ch ? String.fromCharCode(ch) : match;
                 }
             });
         }
+        /** Like `decodeEntities` but returns `undefined` if there were no entities to decode. */
         function tryDecodeEntities(text) {
             var decoded = decodeEntities(text);
             return decoded === text ? undefined : decoded;
         }
         function getTagName(node) {
-            if (node.kind === 255) {
+            if (node.kind === 255 /* JsxElement */) {
                 return getTagName(node.openingElement);
             }
             else {
@@ -51794,6 +65364,11 @@ var ts;
                 }
             }
         }
+        /**
+         * Emit an attribute name, which is quoted if it needs to be quoted. Because
+         * these emit into an object literal property name, we don't need to be worried
+         * about keywords, just non-identifier characters
+         */
         function getAttributeName(node) {
             var name = node.name;
             var text = ts.idText(name);
@@ -52065,6 +65640,7 @@ var ts;
         diams: 0x2666
     });
 })(ts || (ts = {}));
+/*@internal*/
 var ts;
 (function (ts) {
     function transformES2016(context) {
@@ -52077,11 +65653,11 @@ var ts;
             return ts.visitEachChild(node, visitor, context);
         }
         function visitor(node) {
-            if ((node.transformFlags & 32) === 0) {
+            if ((node.transformFlags & 32 /* ContainsES2016 */) === 0) {
                 return node;
             }
             switch (node.kind) {
-                case 200:
+                case 200 /* BinaryExpression */:
                     return visitBinaryExpression(node);
                 default:
                     return ts.visitEachChild(node, visitor, context);
@@ -52089,9 +65665,9 @@ var ts;
         }
         function visitBinaryExpression(node) {
             switch (node.operatorToken.kind) {
-                case 62:
+                case 62 /* AsteriskAsteriskEqualsToken */:
                     return visitExponentiationAssignmentExpression(node);
-                case 40:
+                case 40 /* AsteriskAsteriskToken */:
                     return visitExponentiationExpression(node);
                 default:
                     return ts.visitEachChild(node, visitor, context);
@@ -52103,32 +65679,155 @@ var ts;
             var left = ts.visitNode(node.left, visitor, ts.isExpression);
             var right = ts.visitNode(node.right, visitor, ts.isExpression);
             if (ts.isElementAccessExpression(left)) {
+                // Transforms `a[x] **= b` into `(_a = a)[_x = x] = Math.pow(_a[_x], b)`
                 var expressionTemp = ts.createTempVariable(hoistVariableDeclaration);
                 var argumentExpressionTemp = ts.createTempVariable(hoistVariableDeclaration);
                 target = ts.setTextRange(ts.createElementAccess(ts.setTextRange(ts.createAssignment(expressionTemp, left.expression), left.expression), ts.setTextRange(ts.createAssignment(argumentExpressionTemp, left.argumentExpression), left.argumentExpression)), left);
                 value = ts.setTextRange(ts.createElementAccess(expressionTemp, argumentExpressionTemp), left);
             }
             else if (ts.isPropertyAccessExpression(left)) {
+                // Transforms `a.x **= b` into `(_a = a).x = Math.pow(_a.x, b)`
                 var expressionTemp = ts.createTempVariable(hoistVariableDeclaration);
                 target = ts.setTextRange(ts.createPropertyAccess(ts.setTextRange(ts.createAssignment(expressionTemp, left.expression), left.expression), left.name), left);
                 value = ts.setTextRange(ts.createPropertyAccess(expressionTemp, left.name), left);
             }
             else {
+                // Transforms `a **= b` into `a = Math.pow(a, b)`
                 target = left;
                 value = left;
             }
-            return ts.setTextRange(ts.createAssignment(target, ts.createMathPow(value, right, node)), node);
+            return ts.setTextRange(ts.createAssignment(target, ts.createMathPow(value, right, /*location*/ node)), node);
         }
         function visitExponentiationExpression(node) {
+            // Transforms `a ** b` into `Math.pow(a, b)`
             var left = ts.visitNode(node.left, visitor, ts.isExpression);
             var right = ts.visitNode(node.right, visitor, ts.isExpression);
-            return ts.createMathPow(left, right, node);
+            return ts.createMathPow(left, right, /*location*/ node);
         }
     }
     ts.transformES2016 = transformES2016;
 })(ts || (ts = {}));
+/*@internal*/
 var ts;
 (function (ts) {
+    var ES2015SubstitutionFlags;
+    (function (ES2015SubstitutionFlags) {
+        /** Enables substitutions for captured `this` */
+        ES2015SubstitutionFlags[ES2015SubstitutionFlags["CapturedThis"] = 1] = "CapturedThis";
+        /** Enables substitutions for block-scoped bindings. */
+        ES2015SubstitutionFlags[ES2015SubstitutionFlags["BlockScopedBindings"] = 2] = "BlockScopedBindings";
+    })(ES2015SubstitutionFlags || (ES2015SubstitutionFlags = {}));
+    var CopyDirection;
+    (function (CopyDirection) {
+        CopyDirection[CopyDirection["ToOriginal"] = 0] = "ToOriginal";
+        CopyDirection[CopyDirection["ToOutParameter"] = 1] = "ToOutParameter";
+    })(CopyDirection || (CopyDirection = {}));
+    var Jump;
+    (function (Jump) {
+        Jump[Jump["Break"] = 2] = "Break";
+        Jump[Jump["Continue"] = 4] = "Continue";
+        Jump[Jump["Return"] = 8] = "Return";
+    })(Jump || (Jump = {}));
+    var SuperCaptureResult;
+    (function (SuperCaptureResult) {
+        /**
+         * A capture may have been added for calls to 'super', but
+         * the caller should emit subsequent statements normally.
+         */
+        SuperCaptureResult[SuperCaptureResult["NoReplacement"] = 0] = "NoReplacement";
+        /**
+         * A call to 'super()' got replaced with a capturing statement like:
+         *
+         *  var _this = _super.call(...) || this;
+         *
+         * Callers should skip the current statement.
+         */
+        SuperCaptureResult[SuperCaptureResult["ReplaceSuperCapture"] = 1] = "ReplaceSuperCapture";
+        /**
+         * A call to 'super()' got replaced with a capturing statement like:
+         *
+         *  return _super.call(...) || this;
+         *
+         * Callers should skip the current statement and avoid any returns of '_this'.
+         */
+        SuperCaptureResult[SuperCaptureResult["ReplaceWithReturn"] = 2] = "ReplaceWithReturn";
+    })(SuperCaptureResult || (SuperCaptureResult = {}));
+    // Facts we track as we traverse the tree
+    var HierarchyFacts;
+    (function (HierarchyFacts) {
+        HierarchyFacts[HierarchyFacts["None"] = 0] = "None";
+        //
+        // Ancestor facts
+        //
+        HierarchyFacts[HierarchyFacts["Function"] = 1] = "Function";
+        HierarchyFacts[HierarchyFacts["ArrowFunction"] = 2] = "ArrowFunction";
+        HierarchyFacts[HierarchyFacts["AsyncFunctionBody"] = 4] = "AsyncFunctionBody";
+        HierarchyFacts[HierarchyFacts["NonStaticClassElement"] = 8] = "NonStaticClassElement";
+        HierarchyFacts[HierarchyFacts["CapturesThis"] = 16] = "CapturesThis";
+        HierarchyFacts[HierarchyFacts["ExportedVariableStatement"] = 32] = "ExportedVariableStatement";
+        HierarchyFacts[HierarchyFacts["TopLevel"] = 64] = "TopLevel";
+        HierarchyFacts[HierarchyFacts["Block"] = 128] = "Block";
+        HierarchyFacts[HierarchyFacts["IterationStatement"] = 256] = "IterationStatement";
+        HierarchyFacts[HierarchyFacts["IterationStatementBlock"] = 512] = "IterationStatementBlock";
+        HierarchyFacts[HierarchyFacts["ForStatement"] = 1024] = "ForStatement";
+        HierarchyFacts[HierarchyFacts["ForInOrForOfStatement"] = 2048] = "ForInOrForOfStatement";
+        HierarchyFacts[HierarchyFacts["ConstructorWithCapturedSuper"] = 4096] = "ConstructorWithCapturedSuper";
+        HierarchyFacts[HierarchyFacts["ComputedPropertyName"] = 8192] = "ComputedPropertyName";
+        // NOTE: do not add more ancestor flags without also updating AncestorFactsMask below.
+        //
+        // Ancestor masks
+        //
+        HierarchyFacts[HierarchyFacts["AncestorFactsMask"] = 16383] = "AncestorFactsMask";
+        // We are always in *some* kind of block scope, but only specific block-scope containers are
+        // top-level or Blocks.
+        HierarchyFacts[HierarchyFacts["BlockScopeIncludes"] = 0] = "BlockScopeIncludes";
+        HierarchyFacts[HierarchyFacts["BlockScopeExcludes"] = 4032] = "BlockScopeExcludes";
+        // A source file is a top-level block scope.
+        HierarchyFacts[HierarchyFacts["SourceFileIncludes"] = 64] = "SourceFileIncludes";
+        HierarchyFacts[HierarchyFacts["SourceFileExcludes"] = 3968] = "SourceFileExcludes";
+        // Functions, methods, and accessors are both new lexical scopes and new block scopes.
+        HierarchyFacts[HierarchyFacts["FunctionIncludes"] = 65] = "FunctionIncludes";
+        HierarchyFacts[HierarchyFacts["FunctionExcludes"] = 16286] = "FunctionExcludes";
+        HierarchyFacts[HierarchyFacts["AsyncFunctionBodyIncludes"] = 69] = "AsyncFunctionBodyIncludes";
+        HierarchyFacts[HierarchyFacts["AsyncFunctionBodyExcludes"] = 16278] = "AsyncFunctionBodyExcludes";
+        // Arrow functions are lexically scoped to their container, but are new block scopes.
+        HierarchyFacts[HierarchyFacts["ArrowFunctionIncludes"] = 66] = "ArrowFunctionIncludes";
+        HierarchyFacts[HierarchyFacts["ArrowFunctionExcludes"] = 16256] = "ArrowFunctionExcludes";
+        // Constructors are both new lexical scopes and new block scopes. Constructors are also
+        // always considered non-static members of a class.
+        HierarchyFacts[HierarchyFacts["ConstructorIncludes"] = 73] = "ConstructorIncludes";
+        HierarchyFacts[HierarchyFacts["ConstructorExcludes"] = 16278] = "ConstructorExcludes";
+        // 'do' and 'while' statements are not block scopes. We track that the subtree is contained
+        // within an IterationStatement to indicate whether the embedded statement is an
+        // IterationStatementBlock.
+        HierarchyFacts[HierarchyFacts["DoOrWhileStatementIncludes"] = 256] = "DoOrWhileStatementIncludes";
+        HierarchyFacts[HierarchyFacts["DoOrWhileStatementExcludes"] = 0] = "DoOrWhileStatementExcludes";
+        // 'for' statements are new block scopes and have special handling for 'let' declarations.
+        HierarchyFacts[HierarchyFacts["ForStatementIncludes"] = 1280] = "ForStatementIncludes";
+        HierarchyFacts[HierarchyFacts["ForStatementExcludes"] = 3008] = "ForStatementExcludes";
+        // 'for-in' and 'for-of' statements are new block scopes and have special handling for
+        // 'let' declarations.
+        HierarchyFacts[HierarchyFacts["ForInOrForOfStatementIncludes"] = 2304] = "ForInOrForOfStatementIncludes";
+        HierarchyFacts[HierarchyFacts["ForInOrForOfStatementExcludes"] = 1984] = "ForInOrForOfStatementExcludes";
+        // Blocks (other than function bodies) are new block scopes.
+        HierarchyFacts[HierarchyFacts["BlockIncludes"] = 128] = "BlockIncludes";
+        HierarchyFacts[HierarchyFacts["BlockExcludes"] = 3904] = "BlockExcludes";
+        HierarchyFacts[HierarchyFacts["IterationStatementBlockIncludes"] = 512] = "IterationStatementBlockIncludes";
+        HierarchyFacts[HierarchyFacts["IterationStatementBlockExcludes"] = 4032] = "IterationStatementBlockExcludes";
+        // Computed property names track subtree flags differently than their containing members.
+        HierarchyFacts[HierarchyFacts["ComputedPropertyNameIncludes"] = 8192] = "ComputedPropertyNameIncludes";
+        HierarchyFacts[HierarchyFacts["ComputedPropertyNameExcludes"] = 0] = "ComputedPropertyNameExcludes";
+        //
+        // Subtree facts
+        //
+        HierarchyFacts[HierarchyFacts["NewTarget"] = 16384] = "NewTarget";
+        HierarchyFacts[HierarchyFacts["NewTargetInComputedPropertyName"] = 32768] = "NewTargetInComputedPropertyName";
+        //
+        // Subtree masks
+        //
+        HierarchyFacts[HierarchyFacts["SubtreeFactsMask"] = -16384] = "SubtreeFactsMask";
+        HierarchyFacts[HierarchyFacts["PropagateNewTargetMask"] = 49152] = "PropagateNewTargetMask";
+    })(HierarchyFacts || (HierarchyFacts = {}));
     function transformES2015(context) {
         var startLexicalEnvironment = context.startLexicalEnvironment, resumeLexicalEnvironment = context.resumeLexicalEnvironment, endLexicalEnvironment = context.endLexicalEnvironment, hoistVariableDeclaration = context.hoistVariableDeclaration;
         var compilerOptions = context.getCompilerOptions();
@@ -52144,7 +65843,15 @@ var ts;
         function recordTaggedTemplateString(temp) {
             taggedTemplateStringDeclarations = ts.append(taggedTemplateStringDeclarations, ts.createVariableDeclaration(temp));
         }
+        /**
+         * Used to track if we are emitting body of the converted loop
+         */
         var convertedLoopState;
+        /**
+         * Keeps track of whether substitutions have been enabled for specific cases.
+         * They are persisted between each SourceFile transformation and should not
+         * be reset.
+         */
         var enabledSubstitutions;
         return ts.chainBundle(transformSourceFile);
         function transformSourceFile(node) {
@@ -52158,28 +65865,40 @@ var ts;
             currentSourceFile = undefined;
             currentText = undefined;
             taggedTemplateStringDeclarations = undefined;
-            hierarchyFacts = 0;
+            hierarchyFacts = 0 /* None */;
             return visited;
         }
+        /**
+         * Sets the `HierarchyFacts` for this node prior to visiting this node's subtree, returning the facts set prior to modification.
+         * @param excludeFacts The existing `HierarchyFacts` to reset before visiting the subtree.
+         * @param includeFacts The new `HierarchyFacts` to set before visiting the subtree.
+         */
         function enterSubtree(excludeFacts, includeFacts) {
             var ancestorFacts = hierarchyFacts;
-            hierarchyFacts = (hierarchyFacts & ~excludeFacts | includeFacts) & 16383;
+            hierarchyFacts = (hierarchyFacts & ~excludeFacts | includeFacts) & 16383 /* AncestorFactsMask */;
             return ancestorFacts;
         }
+        /**
+         * Restores the `HierarchyFacts` for this node's ancestor after visiting this node's
+         * subtree, propagating specific facts from the subtree.
+         * @param ancestorFacts The `HierarchyFacts` of the ancestor to restore after visiting the subtree.
+         * @param excludeFacts The existing `HierarchyFacts` of the subtree that should not be propagated.
+         * @param includeFacts The new `HierarchyFacts` of the subtree that should be propagated.
+         */
         function exitSubtree(ancestorFacts, excludeFacts, includeFacts) {
-            hierarchyFacts = (hierarchyFacts & ~excludeFacts | includeFacts) & -16384 | ancestorFacts;
+            hierarchyFacts = (hierarchyFacts & ~excludeFacts | includeFacts) & -16384 /* SubtreeFactsMask */ | ancestorFacts;
         }
         function isReturnVoidStatementInConstructorWithCapturedSuper(node) {
-            return (hierarchyFacts & 4096) !== 0
-                && node.kind === 225
+            return (hierarchyFacts & 4096 /* ConstructorWithCapturedSuper */) !== 0
+                && node.kind === 225 /* ReturnStatement */
                 && !node.expression;
         }
         function shouldVisitNode(node) {
-            return (node.transformFlags & 128) !== 0
+            return (node.transformFlags & 128 /* ContainsES2015 */) !== 0
                 || convertedLoopState !== undefined
-                || (hierarchyFacts & 4096 && (ts.isStatement(node) || (node.kind === 213)))
-                || (ts.isIterationStatement(node, false) && shouldConvertIterationStatementBody(node))
-                || (ts.getEmitFlags(node) & 33554432) !== 0;
+                || (hierarchyFacts & 4096 /* ConstructorWithCapturedSuper */ && (ts.isStatement(node) || (node.kind === 213 /* Block */)))
+                || (ts.isIterationStatement(node, /*lookInLabeledStatements*/ false) && shouldConvertIterationStatementBody(node))
+                || (ts.getEmitFlags(node) & 33554432 /* TypeScriptClassWrapper */) !== 0;
         }
         function visitor(node) {
             if (shouldVisitNode(node)) {
@@ -52191,133 +65910,134 @@ var ts;
         }
         function functionBodyVisitor(node) {
             if (shouldVisitNode(node)) {
-                return visitBlock(node, true);
+                return visitBlock(node, /*isFunctionBody*/ true);
             }
             return node;
         }
         function callExpressionVisitor(node) {
-            if (node.kind === 97) {
-                return visitSuperKeyword(true);
+            if (node.kind === 97 /* SuperKeyword */) {
+                return visitSuperKeyword(/*isExpressionOfCall*/ true);
             }
             return visitor(node);
         }
         function visitJavaScript(node) {
             switch (node.kind) {
-                case 115:
-                    return undefined;
-                case 235:
+                case 115 /* StaticKeyword */:
+                    return undefined; // elide static keyword
+                case 235 /* ClassDeclaration */:
                     return visitClassDeclaration(node);
-                case 205:
+                case 205 /* ClassExpression */:
                     return visitClassExpression(node);
-                case 149:
+                case 149 /* Parameter */:
                     return visitParameter(node);
-                case 234:
+                case 234 /* FunctionDeclaration */:
                     return visitFunctionDeclaration(node);
-                case 193:
+                case 193 /* ArrowFunction */:
                     return visitArrowFunction(node);
-                case 192:
+                case 192 /* FunctionExpression */:
                     return visitFunctionExpression(node);
-                case 232:
+                case 232 /* VariableDeclaration */:
                     return visitVariableDeclaration(node);
-                case 71:
+                case 71 /* Identifier */:
                     return visitIdentifier(node);
-                case 233:
+                case 233 /* VariableDeclarationList */:
                     return visitVariableDeclarationList(node);
-                case 227:
+                case 227 /* SwitchStatement */:
                     return visitSwitchStatement(node);
-                case 241:
+                case 241 /* CaseBlock */:
                     return visitCaseBlock(node);
-                case 213:
-                    return visitBlock(node, false);
-                case 224:
-                case 223:
+                case 213 /* Block */:
+                    return visitBlock(node, /*isFunctionBody*/ false);
+                case 224 /* BreakStatement */:
+                case 223 /* ContinueStatement */:
                     return visitBreakOrContinueStatement(node);
-                case 228:
+                case 228 /* LabeledStatement */:
                     return visitLabeledStatement(node);
-                case 218:
-                case 219:
-                    return visitDoOrWhileStatement(node, undefined);
-                case 220:
-                    return visitForStatement(node, undefined);
-                case 221:
-                    return visitForInStatement(node, undefined);
-                case 222:
-                    return visitForOfStatement(node, undefined);
-                case 216:
+                case 218 /* DoStatement */:
+                case 219 /* WhileStatement */:
+                    return visitDoOrWhileStatement(node, /*outermostLabeledStatement*/ undefined);
+                case 220 /* ForStatement */:
+                    return visitForStatement(node, /*outermostLabeledStatement*/ undefined);
+                case 221 /* ForInStatement */:
+                    return visitForInStatement(node, /*outermostLabeledStatement*/ undefined);
+                case 222 /* ForOfStatement */:
+                    return visitForOfStatement(node, /*outermostLabeledStatement*/ undefined);
+                case 216 /* ExpressionStatement */:
                     return visitExpressionStatement(node);
-                case 184:
+                case 184 /* ObjectLiteralExpression */:
                     return visitObjectLiteralExpression(node);
-                case 269:
+                case 269 /* CatchClause */:
                     return visitCatchClause(node);
-                case 271:
+                case 271 /* ShorthandPropertyAssignment */:
                     return visitShorthandPropertyAssignment(node);
-                case 147:
+                case 147 /* ComputedPropertyName */:
                     return visitComputedPropertyName(node);
-                case 183:
+                case 183 /* ArrayLiteralExpression */:
                     return visitArrayLiteralExpression(node);
-                case 187:
+                case 187 /* CallExpression */:
                     return visitCallExpression(node);
-                case 188:
+                case 188 /* NewExpression */:
                     return visitNewExpression(node);
-                case 191:
-                    return visitParenthesizedExpression(node, true);
-                case 200:
-                    return visitBinaryExpression(node, true);
-                case 13:
-                case 14:
-                case 15:
-                case 16:
+                case 191 /* ParenthesizedExpression */:
+                    return visitParenthesizedExpression(node, /*needsDestructuringValue*/ true);
+                case 200 /* BinaryExpression */:
+                    return visitBinaryExpression(node, /*needsDestructuringValue*/ true);
+                case 13 /* NoSubstitutionTemplateLiteral */:
+                case 14 /* TemplateHead */:
+                case 15 /* TemplateMiddle */:
+                case 16 /* TemplateTail */:
                     return visitTemplateLiteral(node);
-                case 9:
+                case 9 /* StringLiteral */:
                     return visitStringLiteral(node);
-                case 8:
+                case 8 /* NumericLiteral */:
                     return visitNumericLiteral(node);
-                case 189:
+                case 189 /* TaggedTemplateExpression */:
                     return visitTaggedTemplateExpression(node);
-                case 202:
+                case 202 /* TemplateExpression */:
                     return visitTemplateExpression(node);
-                case 203:
+                case 203 /* YieldExpression */:
                     return visitYieldExpression(node);
-                case 204:
+                case 204 /* SpreadElement */:
                     return visitSpreadElement(node);
-                case 97:
-                    return visitSuperKeyword(false);
-                case 99:
+                case 97 /* SuperKeyword */:
+                    return visitSuperKeyword(/*isExpressionOfCall*/ false);
+                case 99 /* ThisKeyword */:
                     return visitThisKeyword(node);
-                case 210:
+                case 210 /* MetaProperty */:
                     return visitMetaProperty(node);
-                case 154:
+                case 154 /* MethodDeclaration */:
                     return visitMethodDeclaration(node);
-                case 156:
-                case 157:
+                case 156 /* GetAccessor */:
+                case 157 /* SetAccessor */:
                     return visitAccessorDeclaration(node);
-                case 214:
+                case 214 /* VariableStatement */:
                     return visitVariableStatement(node);
-                case 225:
+                case 225 /* ReturnStatement */:
                     return visitReturnStatement(node);
                 default:
                     return ts.visitEachChild(node, visitor, context);
             }
         }
         function visitSourceFile(node) {
-            var ancestorFacts = enterSubtree(3968, 64);
+            var ancestorFacts = enterSubtree(3968 /* SourceFileExcludes */, 64 /* SourceFileIncludes */);
             var statements = [];
             startLexicalEnvironment();
-            var statementOffset = ts.addStandardPrologue(statements, node.statements, false);
+            var statementOffset = ts.addStandardPrologue(statements, node.statements, /*ensureUseStrict*/ false);
             addCaptureThisForNodeIfNeeded(statements, node);
             statementOffset = ts.addCustomPrologue(statements, node.statements, statementOffset, visitor);
             ts.addRange(statements, ts.visitNodes(node.statements, visitor, ts.isStatement, statementOffset));
             if (taggedTemplateStringDeclarations) {
-                statements.push(ts.createVariableStatement(undefined, ts.createVariableDeclarationList(taggedTemplateStringDeclarations)));
+                statements.push(ts.createVariableStatement(/*modifiers*/ undefined, ts.createVariableDeclarationList(taggedTemplateStringDeclarations)));
             }
             ts.prependStatements(statements, endLexicalEnvironment());
-            exitSubtree(ancestorFacts, 0, 0);
+            exitSubtree(ancestorFacts, 0 /* None */, 0 /* None */);
             return ts.updateSourceFileNode(node, ts.setTextRange(ts.createNodeArray(statements), node.statements));
         }
         function visitSwitchStatement(node) {
             if (convertedLoopState !== undefined) {
                 var savedAllowedNonLabeledJumps = convertedLoopState.allowedNonLabeledJumps;
-                convertedLoopState.allowedNonLabeledJumps |= 2;
+                // for switch statement allow only non-labeled break
+                convertedLoopState.allowedNonLabeledJumps |= 2 /* Break */;
                 var result = ts.visitEachChild(node, visitor, context);
                 convertedLoopState.allowedNonLabeledJumps = savedAllowedNonLabeledJumps;
                 return result;
@@ -52325,9 +66045,9 @@ var ts;
             return ts.visitEachChild(node, visitor, context);
         }
         function visitCaseBlock(node) {
-            var ancestorFacts = enterSubtree(4032, 0);
+            var ancestorFacts = enterSubtree(4032 /* BlockScopeExcludes */, 0 /* BlockScopeIncludes */);
             var updated = ts.visitEachChild(node, visitor, context);
-            exitSubtree(ancestorFacts, 0, 0);
+            exitSubtree(ancestorFacts, 0 /* None */, 0 /* None */);
             return updated;
         }
         function returnCapturedThis(node) {
@@ -52335,7 +66055,7 @@ var ts;
         }
         function visitReturnStatement(node) {
             if (convertedLoopState) {
-                convertedLoopState.nonLocalJumps |= 8;
+                convertedLoopState.nonLocalJumps |= 8 /* Return */;
                 if (isReturnVoidStatementInConstructorWithCapturedSuper(node)) {
                     node = returnCapturedThis(node);
                 }
@@ -52352,7 +66072,8 @@ var ts;
         }
         function visitThisKeyword(node) {
             if (convertedLoopState) {
-                if (hierarchyFacts & 2) {
+                if (hierarchyFacts & 2 /* ArrowFunction */) {
+                    // if the enclosing function is an ArrowFunction then we use the captured 'this' keyword.
                     convertedLoopState.containsLexicalThis = true;
                     return node;
                 }
@@ -52374,30 +66095,35 @@ var ts;
         }
         function visitBreakOrContinueStatement(node) {
             if (convertedLoopState) {
-                var jump = node.kind === 224 ? 2 : 4;
+                // check if we can emit break/continue as is
+                // it is possible if either
+                //   - break/continue is labeled and label is located inside the converted loop
+                //   - break/continue is non-labeled and located in non-converted loop/switch statement
+                var jump = node.kind === 224 /* BreakStatement */ ? 2 /* Break */ : 4 /* Continue */;
                 var canUseBreakOrContinue = (node.label && convertedLoopState.labels && convertedLoopState.labels.get(ts.idText(node.label))) ||
                     (!node.label && (convertedLoopState.allowedNonLabeledJumps & jump));
                 if (!canUseBreakOrContinue) {
                     var labelMarker = void 0;
                     var label = node.label;
                     if (!label) {
-                        if (node.kind === 224) {
-                            convertedLoopState.nonLocalJumps |= 2;
+                        if (node.kind === 224 /* BreakStatement */) {
+                            convertedLoopState.nonLocalJumps |= 2 /* Break */;
                             labelMarker = "break";
                         }
                         else {
-                            convertedLoopState.nonLocalJumps |= 4;
+                            convertedLoopState.nonLocalJumps |= 4 /* Continue */;
+                            // note: return value is emitted only to simplify debugging, call to converted loop body does not do any dispatching on it.
                             labelMarker = "continue";
                         }
                     }
                     else {
-                        if (node.kind === 224) {
+                        if (node.kind === 224 /* BreakStatement */) {
                             labelMarker = "break-" + label.escapedText;
-                            setLabeledJump(convertedLoopState, true, ts.idText(label), labelMarker);
+                            setLabeledJump(convertedLoopState, /*isBreak*/ true, ts.idText(label), labelMarker);
                         }
                         else {
                             labelMarker = "continue-" + label.escapedText;
-                            setLabeledJump(convertedLoopState, false, ts.idText(label), labelMarker);
+                            setLabeledJump(convertedLoopState, /*isBreak*/ false, ts.idText(label), labelMarker);
                         }
                     }
                     var returnExpression = ts.createLiteral(labelMarker);
@@ -52405,167 +66131,305 @@ var ts;
                         var outParams = convertedLoopState.loopOutParameters;
                         var expr = void 0;
                         for (var i = 0; i < outParams.length; i++) {
-                            var copyExpr = copyOutParameter(outParams[i], 1);
+                            var copyExpr = copyOutParameter(outParams[i], 1 /* ToOutParameter */);
                             if (i === 0) {
                                 expr = copyExpr;
                             }
                             else {
-                                expr = ts.createBinary(expr, 26, copyExpr);
+                                expr = ts.createBinary(expr, 26 /* CommaToken */, copyExpr);
                             }
                         }
-                        returnExpression = ts.createBinary(expr, 26, returnExpression);
+                        returnExpression = ts.createBinary(expr, 26 /* CommaToken */, returnExpression);
                     }
                     return ts.createReturn(returnExpression);
                 }
             }
             return ts.visitEachChild(node, visitor, context);
         }
+        /**
+         * Visits a ClassDeclaration and transforms it into a variable statement.
+         *
+         * @param node A ClassDeclaration node.
+         */
         function visitClassDeclaration(node) {
-            var variable = ts.createVariableDeclaration(ts.getLocalName(node, true), undefined, transformClassLikeDeclarationToExpression(node));
+            // [source]
+            //      class C { }
+            //
+            // [output]
+            //      var C = (function () {
+            //          function C() {
+            //          }
+            //          return C;
+            //      }());
+            var variable = ts.createVariableDeclaration(ts.getLocalName(node, /*allowComments*/ true), 
+            /*type*/ undefined, transformClassLikeDeclarationToExpression(node));
             ts.setOriginalNode(variable, node);
             var statements = [];
-            var statement = ts.createVariableStatement(undefined, ts.createVariableDeclarationList([variable]));
+            var statement = ts.createVariableStatement(/*modifiers*/ undefined, ts.createVariableDeclarationList([variable]));
             ts.setOriginalNode(statement, node);
             ts.setTextRange(statement, node);
             ts.startOnNewLine(statement);
             statements.push(statement);
-            if (ts.hasModifier(node, 1)) {
-                var exportStatement = ts.hasModifier(node, 512)
+            // Add an `export default` statement for default exports (for `--target es5 --module es6`)
+            if (ts.hasModifier(node, 1 /* Export */)) {
+                var exportStatement = ts.hasModifier(node, 512 /* Default */)
                     ? ts.createExportDefault(ts.getLocalName(node))
                     : ts.createExternalModuleExport(ts.getLocalName(node));
                 ts.setOriginalNode(exportStatement, statement);
                 statements.push(exportStatement);
             }
             var emitFlags = ts.getEmitFlags(node);
-            if ((emitFlags & 4194304) === 0) {
+            if ((emitFlags & 4194304 /* HasEndOfDeclarationMarker */) === 0) {
+                // Add a DeclarationMarker as a marker for the end of the declaration
                 statements.push(ts.createEndOfDeclarationMarker(node));
-                ts.setEmitFlags(statement, emitFlags | 4194304);
+                ts.setEmitFlags(statement, emitFlags | 4194304 /* HasEndOfDeclarationMarker */);
             }
             return ts.singleOrMany(statements);
         }
+        /**
+         * Visits a ClassExpression and transforms it into an expression.
+         *
+         * @param node A ClassExpression node.
+         */
         function visitClassExpression(node) {
+            // [source]
+            //      C = class { }
+            //
+            // [output]
+            //      C = (function () {
+            //          function class_1() {
+            //          }
+            //          return class_1;
+            //      }())
             return transformClassLikeDeclarationToExpression(node);
         }
+        /**
+         * Transforms a ClassExpression or ClassDeclaration into an expression.
+         *
+         * @param node A ClassExpression or ClassDeclaration node.
+         */
         function transformClassLikeDeclarationToExpression(node) {
+            // [source]
+            //      class C extends D {
+            //          constructor() {}
+            //          method() {}
+            //          get prop() {}
+            //          set prop(v) {}
+            //      }
+            //
+            // [output]
+            //      (function (_super) {
+            //          __extends(C, _super);
+            //          function C() {
+            //          }
+            //          C.prototype.method = function () {}
+            //          Object.defineProperty(C.prototype, "prop", {
+            //              get: function() {},
+            //              set: function() {},
+            //              enumerable: true,
+            //              configurable: true
+            //          });
+            //          return C;
+            //      }(D))
             if (node.name) {
                 enableSubstitutionsForBlockScopedBindings();
             }
             var extendsClauseElement = ts.getClassExtendsHeritageClauseElement(node);
-            var classFunction = ts.createFunctionExpression(undefined, undefined, undefined, undefined, extendsClauseElement ? [ts.createParameter(undefined, undefined, undefined, ts.createFileLevelUniqueName("_super"))] : [], undefined, transformClassBody(node, extendsClauseElement));
-            ts.setEmitFlags(classFunction, (ts.getEmitFlags(node) & 65536) | 524288);
+            var classFunction = ts.createFunctionExpression(
+            /*modifiers*/ undefined, 
+            /*asteriskToken*/ undefined, 
+            /*name*/ undefined, 
+            /*typeParameters*/ undefined, extendsClauseElement ? [ts.createParameter(/*decorators*/ undefined, /*modifiers*/ undefined, /*dotDotDotToken*/ undefined, ts.createFileLevelUniqueName("_super"))] : [], 
+            /*type*/ undefined, transformClassBody(node, extendsClauseElement));
+            // To preserve the behavior of the old emitter, we explicitly indent
+            // the body of the function here if it was requested in an earlier
+            // transformation.
+            ts.setEmitFlags(classFunction, (ts.getEmitFlags(node) & 65536 /* Indented */) | 524288 /* ReuseTempVariableScope */);
+            // "inner" and "outer" below are added purely to preserve source map locations from
+            // the old emitter
             var inner = ts.createPartiallyEmittedExpression(classFunction);
             inner.end = node.end;
-            ts.setEmitFlags(inner, 1536);
+            ts.setEmitFlags(inner, 1536 /* NoComments */);
             var outer = ts.createPartiallyEmittedExpression(inner);
             outer.end = ts.skipTrivia(currentText, node.pos);
-            ts.setEmitFlags(outer, 1536);
-            var result = ts.createParen(ts.createCall(outer, undefined, extendsClauseElement
+            ts.setEmitFlags(outer, 1536 /* NoComments */);
+            var result = ts.createParen(ts.createCall(outer, 
+            /*typeArguments*/ undefined, extendsClauseElement
                 ? [ts.visitNode(extendsClauseElement.expression, visitor, ts.isExpression)]
                 : []));
-            ts.addSyntheticLeadingComment(result, 3, "* @class ");
+            ts.addSyntheticLeadingComment(result, 3 /* MultiLineCommentTrivia */, "* @class ");
             return result;
         }
+        /**
+         * Transforms a ClassExpression or ClassDeclaration into a function body.
+         *
+         * @param node A ClassExpression or ClassDeclaration node.
+         * @param extendsClauseElement The expression for the class `extends` clause.
+         */
         function transformClassBody(node, extendsClauseElement) {
             var statements = [];
             startLexicalEnvironment();
             addExtendsHelperIfNeeded(statements, node, extendsClauseElement);
             addConstructor(statements, node, extendsClauseElement);
             addClassMembers(statements, node);
-            var closingBraceLocation = ts.createTokenRange(ts.skipTrivia(currentText, node.members.end), 18);
+            // Create a synthetic text range for the return statement.
+            var closingBraceLocation = ts.createTokenRange(ts.skipTrivia(currentText, node.members.end), 18 /* CloseBraceToken */);
             var localName = ts.getInternalName(node);
+            // The following partially-emitted expression exists purely to align our sourcemap
+            // emit with the original emitter.
             var outer = ts.createPartiallyEmittedExpression(localName);
             outer.end = closingBraceLocation.end;
-            ts.setEmitFlags(outer, 1536);
+            ts.setEmitFlags(outer, 1536 /* NoComments */);
             var statement = ts.createReturn(outer);
             statement.pos = closingBraceLocation.pos;
-            ts.setEmitFlags(statement, 1536 | 384);
+            ts.setEmitFlags(statement, 1536 /* NoComments */ | 384 /* NoTokenSourceMaps */);
             statements.push(statement);
             ts.prependStatements(statements, endLexicalEnvironment());
-            var block = ts.createBlock(ts.setTextRange(ts.createNodeArray(statements), node.members), true);
-            ts.setEmitFlags(block, 1536);
+            var block = ts.createBlock(ts.setTextRange(ts.createNodeArray(statements), /*location*/ node.members), /*multiLine*/ true);
+            ts.setEmitFlags(block, 1536 /* NoComments */);
             return block;
         }
+        /**
+         * Adds a call to the `__extends` helper if needed for a class.
+         *
+         * @param statements The statements of the class body function.
+         * @param node The ClassExpression or ClassDeclaration node.
+         * @param extendsClauseElement The expression for the class `extends` clause.
+         */
         function addExtendsHelperIfNeeded(statements, node, extendsClauseElement) {
             if (extendsClauseElement) {
-                statements.push(ts.setTextRange(ts.createStatement(createExtendsHelper(context, ts.getInternalName(node))), extendsClauseElement));
+                statements.push(ts.setTextRange(ts.createStatement(createExtendsHelper(context, ts.getInternalName(node))), 
+                /*location*/ extendsClauseElement));
             }
         }
+        /**
+         * Adds the constructor of the class to a class body function.
+         *
+         * @param statements The statements of the class body function.
+         * @param node The ClassExpression or ClassDeclaration node.
+         * @param extendsClauseElement The expression for the class `extends` clause.
+         */
         function addConstructor(statements, node, extendsClauseElement) {
             var savedConvertedLoopState = convertedLoopState;
             convertedLoopState = undefined;
-            var ancestorFacts = enterSubtree(16278, 73);
+            var ancestorFacts = enterSubtree(16278 /* ConstructorExcludes */, 73 /* ConstructorIncludes */);
             var constructor = ts.getFirstConstructorWithBody(node);
             var hasSynthesizedSuper = hasSynthesizedDefaultSuperCall(constructor, extendsClauseElement !== undefined);
-            var constructorFunction = ts.createFunctionDeclaration(undefined, undefined, undefined, ts.getInternalName(node), undefined, transformConstructorParameters(constructor, hasSynthesizedSuper), undefined, transformConstructorBody(constructor, node, extendsClauseElement, hasSynthesizedSuper));
+            var constructorFunction = ts.createFunctionDeclaration(
+            /*decorators*/ undefined, 
+            /*modifiers*/ undefined, 
+            /*asteriskToken*/ undefined, ts.getInternalName(node), 
+            /*typeParameters*/ undefined, transformConstructorParameters(constructor, hasSynthesizedSuper), 
+            /*type*/ undefined, transformConstructorBody(constructor, node, extendsClauseElement, hasSynthesizedSuper));
             ts.setTextRange(constructorFunction, constructor || node);
             if (extendsClauseElement) {
-                ts.setEmitFlags(constructorFunction, 8);
+                ts.setEmitFlags(constructorFunction, 8 /* CapturesThis */);
             }
             statements.push(constructorFunction);
-            exitSubtree(ancestorFacts, 49152, 0);
+            exitSubtree(ancestorFacts, 49152 /* PropagateNewTargetMask */, 0 /* None */);
             convertedLoopState = savedConvertedLoopState;
         }
+        /**
+         * Transforms the parameters of the constructor declaration of a class.
+         *
+         * @param constructor The constructor for the class.
+         * @param hasSynthesizedSuper A value indicating whether the constructor starts with a
+         *                            synthesized `super` call.
+         */
         function transformConstructorParameters(constructor, hasSynthesizedSuper) {
+            // If the TypeScript transformer needed to synthesize a constructor for property
+            // initializers, it would have also added a synthetic `...args` parameter and
+            // `super` call.
+            // If this is the case, we do not include the synthetic `...args` parameter and
+            // will instead use the `arguments` object in ES5/3.
             return ts.visitParameterList(constructor && !hasSynthesizedSuper ? constructor.parameters : undefined, visitor, context)
                 || [];
         }
+        /**
+         * Transforms the body of a constructor declaration of a class.
+         *
+         * @param constructor The constructor for the class.
+         * @param node The node which contains the constructor.
+         * @param extendsClauseElement The expression for the class `extends` clause.
+         * @param hasSynthesizedSuper A value indicating whether the constructor starts with a
+         *                            synthesized `super` call.
+         */
         function transformConstructorBody(constructor, node, extendsClauseElement, hasSynthesizedSuper) {
             var statements = [];
             resumeLexicalEnvironment();
             var statementOffset = -1;
             if (hasSynthesizedSuper) {
+                // If a super call has already been synthesized,
+                // we're going to assume that we should just transform everything after that.
+                // The assumption is that no prior step in the pipeline has added any prologue directives.
                 statementOffset = 0;
             }
             else if (constructor) {
-                statementOffset = ts.addStandardPrologue(statements, constructor.body.statements, false);
+                statementOffset = ts.addStandardPrologue(statements, constructor.body.statements, /*ensureUseStrict*/ false);
             }
             if (constructor) {
                 addDefaultValueAssignmentsIfNeeded(statements, constructor);
                 addRestParameterIfNeeded(statements, constructor, hasSynthesizedSuper);
                 if (!hasSynthesizedSuper) {
+                    // If no super call has been synthesized, emit custom prologue directives.
                     statementOffset = ts.addCustomPrologue(statements, constructor.body.statements, statementOffset, visitor);
                 }
                 ts.Debug.assert(statementOffset >= 0, "statementOffset not initialized correctly!");
             }
-            var isDerivedClass = !!extendsClauseElement && ts.skipOuterExpressions(extendsClauseElement.expression).kind !== 95;
+            // determine whether the class is known syntactically to be a derived class (e.g. a
+            // class that extends a value that is not syntactically known to be `null`).
+            var isDerivedClass = !!extendsClauseElement && ts.skipOuterExpressions(extendsClauseElement.expression).kind !== 95 /* NullKeyword */;
             var superCaptureStatus = declareOrCaptureOrReturnThisForConstructorIfNeeded(statements, constructor, isDerivedClass, hasSynthesizedSuper, statementOffset);
-            if (superCaptureStatus === 1 || superCaptureStatus === 2) {
+            // The last statement expression was replaced. Skip it.
+            if (superCaptureStatus === 1 /* ReplaceSuperCapture */ || superCaptureStatus === 2 /* ReplaceWithReturn */) {
                 statementOffset++;
             }
             if (constructor) {
-                if (superCaptureStatus === 1) {
-                    hierarchyFacts |= 4096;
+                if (superCaptureStatus === 1 /* ReplaceSuperCapture */) {
+                    hierarchyFacts |= 4096 /* ConstructorWithCapturedSuper */;
                 }
-                ts.addRange(statements, ts.visitNodes(constructor.body.statements, visitor, ts.isStatement, statementOffset));
+                ts.addRange(statements, ts.visitNodes(constructor.body.statements, visitor, ts.isStatement, /*start*/ statementOffset));
             }
+            // Return `_this` unless we're sure enough that it would be pointless to add a return statement.
+            // If there's a constructor that we can tell returns in enough places, then we *do not* want to add a return.
             if (isDerivedClass
-                && superCaptureStatus !== 2
+                && superCaptureStatus !== 2 /* ReplaceWithReturn */
                 && !(constructor && isSufficientlyCoveredByReturnStatements(constructor.body))) {
                 statements.push(ts.createReturn(ts.createFileLevelUniqueName("_this")));
             }
             ts.prependStatements(statements, endLexicalEnvironment());
             if (constructor) {
-                prependCaptureNewTargetIfNeeded(statements, constructor, false);
+                prependCaptureNewTargetIfNeeded(statements, constructor, /*copyOnWrite*/ false);
             }
-            var block = ts.createBlock(ts.setTextRange(ts.createNodeArray(statements), constructor ? constructor.body.statements : node.members), true);
+            var block = ts.createBlock(ts.setTextRange(ts.createNodeArray(statements), 
+            /*location*/ constructor ? constructor.body.statements : node.members), 
+            /*multiLine*/ true);
             ts.setTextRange(block, constructor ? constructor.body : node);
             if (!constructor) {
-                ts.setEmitFlags(block, 1536);
+                ts.setEmitFlags(block, 1536 /* NoComments */);
             }
             return block;
         }
+        /**
+         * We want to try to avoid emitting a return statement in certain cases if a user already returned something.
+         * It would generate obviously dead code, so we'll try to make things a little bit prettier
+         * by doing a minimal check on whether some common patterns always explicitly return.
+         */
         function isSufficientlyCoveredByReturnStatements(statement) {
-            if (statement.kind === 225) {
+            // A return statement is considered covered.
+            if (statement.kind === 225 /* ReturnStatement */) {
                 return true;
             }
-            else if (statement.kind === 217) {
+            // An if-statement with two covered branches is covered.
+            else if (statement.kind === 217 /* IfStatement */) {
                 var ifStatement = statement;
                 if (ifStatement.elseStatement) {
                     return isSufficientlyCoveredByReturnStatements(ifStatement.thenStatement) &&
                         isSufficientlyCoveredByReturnStatements(ifStatement.elseStatement);
                 }
             }
-            else if (statement.kind === 213) {
+            // A block is covered if it has a last statement which is covered.
+            else if (statement.kind === 213 /* Block */) {
                 var lastStatement = ts.lastOrUndefined(statement.statements);
                 if (lastStatement && isSufficientlyCoveredByReturnStatements(lastStatement)) {
                     return true;
@@ -52573,72 +66437,144 @@ var ts;
             }
             return false;
         }
+        /**
+         * Declares a `_this` variable for derived classes and for when arrow functions capture `this`.
+         *
+         * @returns The new statement offset into the `statements` array.
+         */
         function declareOrCaptureOrReturnThisForConstructorIfNeeded(statements, ctor, isDerivedClass, hasSynthesizedSuper, statementOffset) {
+            // If this isn't a derived class, just capture 'this' for arrow functions if necessary.
             if (!isDerivedClass) {
                 if (ctor) {
                     addCaptureThisForNodeIfNeeded(statements, ctor);
                 }
-                return 0;
+                return 0 /* NoReplacement */;
             }
+            // We must be here because the user didn't write a constructor
+            // but we needed to call 'super(...args)' anyway as per 14.5.14 of the ES2016 spec.
+            // If that's the case we can just immediately return the result of a 'super()' call.
             if (!ctor) {
                 statements.push(ts.createReturn(createDefaultSuperCallOrThis()));
-                return 2;
+                return 2 /* ReplaceWithReturn */;
             }
+            // The constructor exists, but it and the 'super()' call it contains were generated
+            // for something like property initializers.
+            // Create a captured '_this' variable and assume it will subsequently be used.
             if (hasSynthesizedSuper) {
                 captureThisForNode(statements, ctor, createDefaultSuperCallOrThis());
                 enableSubstitutionsForCapturedThis();
-                return 1;
+                return 1 /* ReplaceSuperCapture */;
             }
+            // Most of the time, a 'super' call will be the first real statement in a constructor body.
+            // In these cases, we'd like to transform these into a *single* statement instead of a declaration
+            // followed by an assignment statement for '_this'. For instance, if we emitted without an initializer,
+            // we'd get:
+            //
+            //      var _this;
+            //      _this = _super.call(...) || this;
+            //
+            // instead of
+            //
+            //      var _this = _super.call(...) || this;
+            //
+            // Additionally, if the 'super()' call is the last statement, we should just avoid capturing
+            // entirely and immediately return the result like so:
+            //
+            //      return _super.call(...) || this;
+            //
             var firstStatement;
             var superCallExpression;
             var ctorStatements = ctor.body.statements;
             if (statementOffset < ctorStatements.length) {
                 firstStatement = ctorStatements[statementOffset];
-                if (firstStatement.kind === 216 && ts.isSuperCall(firstStatement.expression)) {
+                if (firstStatement.kind === 216 /* ExpressionStatement */ && ts.isSuperCall(firstStatement.expression)) {
                     superCallExpression = visitImmediateSuperCallInBody(firstStatement.expression);
                 }
             }
+            // Return the result if we have an immediate super() call on the last statement,
+            // but only if the constructor itself doesn't use 'this' elsewhere.
             if (superCallExpression
                 && statementOffset === ctorStatements.length - 1
-                && !(ctor.transformFlags & (16384 | 32768))) {
+                && !(ctor.transformFlags & (16384 /* ContainsLexicalThis */ | 32768 /* ContainsCapturedLexicalThis */))) {
                 var returnStatement = ts.createReturn(superCallExpression);
-                if (superCallExpression.kind !== 200
-                    || superCallExpression.left.kind !== 187) {
+                if (superCallExpression.kind !== 200 /* BinaryExpression */
+                    || superCallExpression.left.kind !== 187 /* CallExpression */) {
                     ts.Debug.fail("Assumed generated super call would have form 'super.call(...) || this'.");
                 }
-                ts.setCommentRange(returnStatement, ts.getCommentRange(ts.setEmitFlags(superCallExpression.left, 1536)));
+                // Shift comments from the original super call to the return statement.
+                ts.setCommentRange(returnStatement, ts.getCommentRange(ts.setEmitFlags(superCallExpression.left, 1536 /* NoComments */)));
                 statements.push(returnStatement);
-                return 2;
+                return 2 /* ReplaceWithReturn */;
             }
+            // Perform the capture.
             captureThisForNode(statements, ctor, superCallExpression || createActualThis(), firstStatement);
+            // If we're actually replacing the original statement, we need to signal this to the caller.
             if (superCallExpression) {
-                return 1;
+                return 1 /* ReplaceSuperCapture */;
             }
-            return 0;
+            return 0 /* NoReplacement */;
         }
         function createActualThis() {
-            return ts.setEmitFlags(ts.createThis(), 4);
+            return ts.setEmitFlags(ts.createThis(), 4 /* NoSubstitution */);
         }
         function createDefaultSuperCallOrThis() {
             return ts.createLogicalOr(ts.createLogicalAnd(ts.createStrictInequality(ts.createFileLevelUniqueName("_super"), ts.createNull()), ts.createFunctionApply(ts.createFileLevelUniqueName("_super"), createActualThis(), ts.createIdentifier("arguments"))), createActualThis());
         }
+        /**
+         * Visits a parameter declaration.
+         *
+         * @param node A ParameterDeclaration node.
+         */
         function visitParameter(node) {
             if (node.dotDotDotToken) {
+                // rest parameters are elided
                 return undefined;
             }
             else if (ts.isBindingPattern(node.name)) {
-                return ts.setOriginalNode(ts.setTextRange(ts.createParameter(undefined, undefined, undefined, ts.getGeneratedNameForNode(node), undefined, undefined, undefined), node), node);
+                // Binding patterns are converted into a generated name and are
+                // evaluated inside the function body.
+                return ts.setOriginalNode(ts.setTextRange(ts.createParameter(
+                /*decorators*/ undefined, 
+                /*modifiers*/ undefined, 
+                /*dotDotDotToken*/ undefined, ts.getGeneratedNameForNode(node), 
+                /*questionToken*/ undefined, 
+                /*type*/ undefined, 
+                /*initializer*/ undefined), 
+                /*location*/ node), 
+                /*original*/ node);
             }
             else if (node.initializer) {
-                return ts.setOriginalNode(ts.setTextRange(ts.createParameter(undefined, undefined, undefined, node.name, undefined, undefined, undefined), node), node);
+                // Initializers are elided
+                return ts.setOriginalNode(ts.setTextRange(ts.createParameter(
+                /*decorators*/ undefined, 
+                /*modifiers*/ undefined, 
+                /*dotDotDotToken*/ undefined, node.name, 
+                /*questionToken*/ undefined, 
+                /*type*/ undefined, 
+                /*initializer*/ undefined), 
+                /*location*/ node), 
+                /*original*/ node);
             }
             else {
                 return node;
             }
         }
+        /**
+         * Gets a value indicating whether we need to add default value assignments for a
+         * function-like node.
+         *
+         * @param node A function-like node.
+         */
         function shouldAddDefaultValueAssignments(node) {
-            return (node.transformFlags & 131072) !== 0;
+            return (node.transformFlags & 131072 /* ContainsDefaultValueAssignments */) !== 0;
         }
+        /**
+         * Adds statements to the body of a function-like node if it contains parameters with
+         * binding patterns or initializers.
+         *
+         * @param statements The statements for the new function body.
+         * @param node A function-like node.
+         */
         function addDefaultValueAssignmentsIfNeeded(statements, node) {
             if (!shouldAddDefaultValueAssignments(node)) {
                 return;
@@ -52646,6 +66582,8 @@ var ts;
             for (var _i = 0, _a = node.parameters; _i < _a.length; _i++) {
                 var parameter = _a[_i];
                 var name = parameter.name, initializer = parameter.initializer, dotDotDotToken = parameter.dotDotDotToken;
+                // A rest parameter cannot have a binding pattern or an initializer,
+                // so let's just ignore it.
                 if (dotDotDotToken) {
                     continue;
                 }
@@ -52657,90 +66595,153 @@ var ts;
                 }
             }
         }
+        /**
+         * Adds statements to the body of a function-like node for parameters with binding patterns
+         *
+         * @param statements The statements for the new function body.
+         * @param parameter The parameter for the function.
+         * @param name The name of the parameter.
+         * @param initializer The initializer for the parameter.
+         */
         function addDefaultValueAssignmentForBindingPattern(statements, parameter, name, initializer) {
             var temp = ts.getGeneratedNameForNode(parameter);
+            // In cases where a binding pattern is simply '[]' or '{}',
+            // we usually don't want to emit a var declaration; however, in the presence
+            // of an initializer, we must emit that expression to preserve side effects.
             if (name.elements.length > 0) {
-                statements.push(ts.setEmitFlags(ts.createVariableStatement(undefined, ts.createVariableDeclarationList(ts.flattenDestructuringBinding(parameter, visitor, context, 0, temp))), 1048576));
+                statements.push(ts.setEmitFlags(ts.createVariableStatement(
+                /*modifiers*/ undefined, ts.createVariableDeclarationList(ts.flattenDestructuringBinding(parameter, visitor, context, 0 /* All */, temp))), 1048576 /* CustomPrologue */));
             }
             else if (initializer) {
-                statements.push(ts.setEmitFlags(ts.createStatement(ts.createAssignment(temp, ts.visitNode(initializer, visitor, ts.isExpression))), 1048576));
+                statements.push(ts.setEmitFlags(ts.createStatement(ts.createAssignment(temp, ts.visitNode(initializer, visitor, ts.isExpression))), 1048576 /* CustomPrologue */));
             }
         }
+        /**
+         * Adds statements to the body of a function-like node for parameters with initializers.
+         *
+         * @param statements The statements for the new function body.
+         * @param parameter The parameter for the function.
+         * @param name The name of the parameter.
+         * @param initializer The initializer for the parameter.
+         */
         function addDefaultValueAssignmentForInitializer(statements, parameter, name, initializer) {
             initializer = ts.visitNode(initializer, visitor, ts.isExpression);
             var statement = ts.createIf(ts.createTypeCheck(ts.getSynthesizedClone(name), "undefined"), ts.setEmitFlags(ts.setTextRange(ts.createBlock([
-                ts.createStatement(ts.setEmitFlags(ts.setTextRange(ts.createAssignment(ts.setEmitFlags(ts.getMutableClone(name), 48), ts.setEmitFlags(initializer, 48 | ts.getEmitFlags(initializer) | 1536)), parameter), 1536))
-            ]), parameter), 1 | 32 | 384 | 1536));
+                ts.createStatement(ts.setEmitFlags(ts.setTextRange(ts.createAssignment(ts.setEmitFlags(ts.getMutableClone(name), 48 /* NoSourceMap */), ts.setEmitFlags(initializer, 48 /* NoSourceMap */ | ts.getEmitFlags(initializer) | 1536 /* NoComments */)), parameter), 1536 /* NoComments */))
+            ]), parameter), 1 /* SingleLine */ | 32 /* NoTrailingSourceMap */ | 384 /* NoTokenSourceMaps */ | 1536 /* NoComments */));
             ts.startOnNewLine(statement);
             ts.setTextRange(statement, parameter);
-            ts.setEmitFlags(statement, 384 | 32 | 1048576 | 1536);
+            ts.setEmitFlags(statement, 384 /* NoTokenSourceMaps */ | 32 /* NoTrailingSourceMap */ | 1048576 /* CustomPrologue */ | 1536 /* NoComments */);
             statements.push(statement);
         }
+        /**
+         * Gets a value indicating whether we need to add statements to handle a rest parameter.
+         *
+         * @param node A ParameterDeclaration node.
+         * @param inConstructorWithSynthesizedSuper A value indicating whether the parameter is
+         *                                          part of a constructor declaration with a
+         *                                          synthesized call to `super`
+         */
         function shouldAddRestParameter(node, inConstructorWithSynthesizedSuper) {
-            return node && node.dotDotDotToken && node.name.kind === 71 && !inConstructorWithSynthesizedSuper;
+            return node && node.dotDotDotToken && node.name.kind === 71 /* Identifier */ && !inConstructorWithSynthesizedSuper;
         }
+        /**
+         * Adds statements to the body of a function-like node if it contains a rest parameter.
+         *
+         * @param statements The statements for the new function body.
+         * @param node A function-like node.
+         * @param inConstructorWithSynthesizedSuper A value indicating whether the parameter is
+         *                                          part of a constructor declaration with a
+         *                                          synthesized call to `super`
+         */
         function addRestParameterIfNeeded(statements, node, inConstructorWithSynthesizedSuper) {
             var parameter = ts.lastOrUndefined(node.parameters);
             if (!shouldAddRestParameter(parameter, inConstructorWithSynthesizedSuper)) {
                 return;
             }
+            // `declarationName` is the name of the local declaration for the parameter.
             var declarationName = ts.getMutableClone(parameter.name);
-            ts.setEmitFlags(declarationName, 48);
+            ts.setEmitFlags(declarationName, 48 /* NoSourceMap */);
+            // `expressionName` is the name of the parameter used in expressions.
             var expressionName = ts.getSynthesizedClone(parameter.name);
             var restIndex = node.parameters.length - 1;
             var temp = ts.createLoopVariable();
-            statements.push(ts.setEmitFlags(ts.setTextRange(ts.createVariableStatement(undefined, ts.createVariableDeclarationList([
-                ts.createVariableDeclaration(declarationName, undefined, ts.createArrayLiteral([]))
-            ])), parameter), 1048576));
+            // var param = [];
+            statements.push(ts.setEmitFlags(ts.setTextRange(ts.createVariableStatement(
+            /*modifiers*/ undefined, ts.createVariableDeclarationList([
+                ts.createVariableDeclaration(declarationName, 
+                /*type*/ undefined, ts.createArrayLiteral([]))
+            ])), 
+            /*location*/ parameter), 1048576 /* CustomPrologue */));
+            // for (var _i = restIndex; _i < arguments.length; _i++) {
+            //   param[_i - restIndex] = arguments[_i];
+            // }
             var forStatement = ts.createFor(ts.setTextRange(ts.createVariableDeclarationList([
-                ts.createVariableDeclaration(temp, undefined, ts.createLiteral(restIndex))
+                ts.createVariableDeclaration(temp, /*type*/ undefined, ts.createLiteral(restIndex))
             ]), parameter), ts.setTextRange(ts.createLessThan(temp, ts.createPropertyAccess(ts.createIdentifier("arguments"), "length")), parameter), ts.setTextRange(ts.createPostfixIncrement(temp), parameter), ts.createBlock([
                 ts.startOnNewLine(ts.setTextRange(ts.createStatement(ts.createAssignment(ts.createElementAccess(expressionName, restIndex === 0
                     ? temp
-                    : ts.createSubtract(temp, ts.createLiteral(restIndex))), ts.createElementAccess(ts.createIdentifier("arguments"), temp))), parameter))
+                    : ts.createSubtract(temp, ts.createLiteral(restIndex))), ts.createElementAccess(ts.createIdentifier("arguments"), temp))), 
+                /*location*/ parameter))
             ]));
-            ts.setEmitFlags(forStatement, 1048576);
+            ts.setEmitFlags(forStatement, 1048576 /* CustomPrologue */);
             ts.startOnNewLine(forStatement);
             statements.push(forStatement);
         }
+        /**
+         * Adds a statement to capture the `this` of a function declaration if it is needed.
+         *
+         * @param statements The statements for the new function body.
+         * @param node A node.
+         */
         function addCaptureThisForNodeIfNeeded(statements, node) {
-            if (node.transformFlags & 32768 && node.kind !== 193) {
+            if (node.transformFlags & 32768 /* ContainsCapturedLexicalThis */ && node.kind !== 193 /* ArrowFunction */) {
                 captureThisForNode(statements, node, ts.createThis());
             }
         }
         function captureThisForNode(statements, node, initializer, originalStatement) {
             enableSubstitutionsForCapturedThis();
-            var captureThisStatement = ts.createVariableStatement(undefined, ts.createVariableDeclarationList([
-                ts.createVariableDeclaration(ts.createFileLevelUniqueName("_this"), undefined, initializer)
+            var captureThisStatement = ts.createVariableStatement(
+            /*modifiers*/ undefined, ts.createVariableDeclarationList([
+                ts.createVariableDeclaration(ts.createFileLevelUniqueName("_this"), 
+                /*type*/ undefined, initializer)
             ]));
-            ts.setEmitFlags(captureThisStatement, 1536 | 1048576);
+            ts.setEmitFlags(captureThisStatement, 1536 /* NoComments */ | 1048576 /* CustomPrologue */);
             ts.setTextRange(captureThisStatement, originalStatement);
             ts.setSourceMapRange(captureThisStatement, node);
             statements.push(captureThisStatement);
         }
         function prependCaptureNewTargetIfNeeded(statements, node, copyOnWrite) {
-            if (hierarchyFacts & 16384) {
+            if (hierarchyFacts & 16384 /* NewTarget */) {
                 var newTarget = void 0;
                 switch (node.kind) {
-                    case 193:
+                    case 193 /* ArrowFunction */:
                         return statements;
-                    case 154:
-                    case 156:
-                    case 157:
+                    case 154 /* MethodDeclaration */:
+                    case 156 /* GetAccessor */:
+                    case 157 /* SetAccessor */:
+                        // Methods and accessors cannot be constructors, so 'new.target' will
+                        // always return 'undefined'.
                         newTarget = ts.createVoidZero();
                         break;
-                    case 155:
-                        newTarget = ts.createPropertyAccess(ts.setEmitFlags(ts.createThis(), 4), "constructor");
+                    case 155 /* Constructor */:
+                        // Class constructors can only be called with `new`, so `this.constructor`
+                        // should be relatively safe to use.
+                        newTarget = ts.createPropertyAccess(ts.setEmitFlags(ts.createThis(), 4 /* NoSubstitution */), "constructor");
                         break;
-                    case 234:
-                    case 192:
-                        newTarget = ts.createConditional(ts.createLogicalAnd(ts.setEmitFlags(ts.createThis(), 4), ts.createBinary(ts.setEmitFlags(ts.createThis(), 4), 93, ts.getLocalName(node))), ts.createPropertyAccess(ts.setEmitFlags(ts.createThis(), 4), "constructor"), ts.createVoidZero());
+                    case 234 /* FunctionDeclaration */:
+                    case 192 /* FunctionExpression */:
+                        // Functions can be called or constructed, and may have a `this` due to
+                        // being a member or when calling an imported function via `other_1.f()`.
+                        newTarget = ts.createConditional(ts.createLogicalAnd(ts.setEmitFlags(ts.createThis(), 4 /* NoSubstitution */), ts.createBinary(ts.setEmitFlags(ts.createThis(), 4 /* NoSubstitution */), 93 /* InstanceOfKeyword */, ts.getLocalName(node))), ts.createPropertyAccess(ts.setEmitFlags(ts.createThis(), 4 /* NoSubstitution */), "constructor"), ts.createVoidZero());
                         break;
                     default:
                         return ts.Debug.failBadSyntaxKind(node);
                 }
-                var captureNewTargetStatement = ts.createVariableStatement(undefined, ts.createVariableDeclarationList([
-                    ts.createVariableDeclaration(ts.createFileLevelUniqueName("_newTarget"), undefined, newTarget)
+                var captureNewTargetStatement = ts.createVariableStatement(
+                /*modifiers*/ undefined, ts.createVariableDeclarationList([
+                    ts.createVariableDeclaration(ts.createFileLevelUniqueName("_newTarget"), 
+                    /*type*/ undefined, newTarget)
                 ]));
                 if (copyOnWrite) {
                     return [captureNewTargetStatement].concat(statements);
@@ -52749,24 +66750,32 @@ var ts;
             }
             return statements;
         }
+        /**
+         * Adds statements to the class body function for a class to define the members of the
+         * class.
+         *
+         * @param statements The statements for the class body function.
+         * @param node The ClassExpression or ClassDeclaration node.
+         */
         function addClassMembers(statements, node) {
             for (var _i = 0, _a = node.members; _i < _a.length; _i++) {
                 var member = _a[_i];
                 switch (member.kind) {
-                    case 212:
+                    case 212 /* SemicolonClassElement */:
                         statements.push(transformSemicolonClassElementToStatement(member));
                         break;
-                    case 154:
+                    case 154 /* MethodDeclaration */:
                         statements.push(transformClassMethodDeclarationToStatement(getClassMemberPrefix(node, member), member, node));
                         break;
-                    case 156:
-                    case 157:
+                    case 156 /* GetAccessor */:
+                    case 157 /* SetAccessor */:
                         var accessors = ts.getAllAccessorDeclarations(node.members, member);
                         if (member === accessors.firstAccessor) {
                             statements.push(transformAccessorsToStatement(getClassMemberPrefix(node, member), accessors, node));
                         }
                         break;
-                    case 155:
+                    case 155 /* Constructor */:
+                        // Constructors are handled in visitClassExpression/visitClassDeclaration
                         break;
                     default:
                         ts.Debug.failBadSyntaxKind(node);
@@ -52774,158 +66783,239 @@ var ts;
                 }
             }
         }
+        /**
+         * Transforms a SemicolonClassElement into a statement for a class body function.
+         *
+         * @param member The SemicolonClassElement node.
+         */
         function transformSemicolonClassElementToStatement(member) {
             return ts.setTextRange(ts.createEmptyStatement(), member);
         }
+        /**
+         * Transforms a MethodDeclaration into a statement for a class body function.
+         *
+         * @param receiver The receiver for the member.
+         * @param member The MethodDeclaration node.
+         */
         function transformClassMethodDeclarationToStatement(receiver, member, container) {
-            var ancestorFacts = enterSubtree(0, 0);
+            var ancestorFacts = enterSubtree(0 /* None */, 0 /* None */);
             var commentRange = ts.getCommentRange(member);
             var sourceMapRange = ts.getSourceMapRange(member);
-            var memberName = ts.createMemberAccessForPropertyName(receiver, ts.visitNode(member.name, visitor, ts.isPropertyName), member.name);
-            var memberFunction = transformFunctionLikeToExpression(member, member, undefined, container);
-            ts.setEmitFlags(memberFunction, 1536);
+            var memberName = ts.createMemberAccessForPropertyName(receiver, ts.visitNode(member.name, visitor, ts.isPropertyName), /*location*/ member.name);
+            var memberFunction = transformFunctionLikeToExpression(member, /*location*/ member, /*name*/ undefined, container);
+            ts.setEmitFlags(memberFunction, 1536 /* NoComments */);
             ts.setSourceMapRange(memberFunction, sourceMapRange);
-            var statement = ts.setTextRange(ts.createStatement(ts.createAssignment(memberName, memberFunction)), member);
+            var statement = ts.setTextRange(ts.createStatement(ts.createAssignment(memberName, memberFunction)), 
+            /*location*/ member);
             ts.setOriginalNode(statement, member);
             ts.setCommentRange(statement, commentRange);
-            ts.setEmitFlags(statement, 48);
-            exitSubtree(ancestorFacts, 49152, hierarchyFacts & 49152 ? 16384 : 0);
+            // The location for the statement is used to emit comments only.
+            // No source map should be emitted for this statement to align with the
+            // old emitter.
+            ts.setEmitFlags(statement, 48 /* NoSourceMap */);
+            exitSubtree(ancestorFacts, 49152 /* PropagateNewTargetMask */, hierarchyFacts & 49152 /* PropagateNewTargetMask */ ? 16384 /* NewTarget */ : 0 /* None */);
             return statement;
         }
+        /**
+         * Transforms a set of related of get/set accessors into a statement for a class body function.
+         *
+         * @param receiver The receiver for the member.
+         * @param accessors The set of related get/set accessors.
+         */
         function transformAccessorsToStatement(receiver, accessors, container) {
-            var statement = ts.createStatement(transformAccessorsToExpression(receiver, accessors, container, false));
-            ts.setEmitFlags(statement, 1536);
+            var statement = ts.createStatement(transformAccessorsToExpression(receiver, accessors, container, /*startsOnNewLine*/ false));
+            // The location for the statement is used to emit source maps only.
+            // No comments should be emitted for this statement to align with the
+            // old emitter.
+            ts.setEmitFlags(statement, 1536 /* NoComments */);
             ts.setSourceMapRange(statement, ts.getSourceMapRange(accessors.firstAccessor));
             return statement;
         }
+        /**
+         * Transforms a set of related get/set accessors into an expression for either a class
+         * body function or an ObjectLiteralExpression with computed properties.
+         *
+         * @param receiver The receiver for the member.
+         */
         function transformAccessorsToExpression(receiver, _a, container, startsOnNewLine) {
             var firstAccessor = _a.firstAccessor, getAccessor = _a.getAccessor, setAccessor = _a.setAccessor;
-            var ancestorFacts = enterSubtree(0, 0);
+            var ancestorFacts = enterSubtree(0 /* None */, 0 /* None */);
+            // To align with source maps in the old emitter, the receiver and property name
+            // arguments are both mapped contiguously to the accessor name.
             var target = ts.getMutableClone(receiver);
-            ts.setEmitFlags(target, 1536 | 32);
-            ts.setSourceMapRange(target, firstAccessor.name);
+            ts.setEmitFlags(target, 1536 /* NoComments */ | 32 /* NoTrailingSourceMap */);
+            ts.setSourceMapRange(target, firstAccessor.name); // TODO: GH#18217
             var propertyName = ts.createExpressionForPropertyName(ts.visitNode(firstAccessor.name, visitor, ts.isPropertyName));
-            ts.setEmitFlags(propertyName, 1536 | 16);
+            ts.setEmitFlags(propertyName, 1536 /* NoComments */ | 16 /* NoLeadingSourceMap */);
             ts.setSourceMapRange(propertyName, firstAccessor.name);
             var properties = [];
             if (getAccessor) {
-                var getterFunction = transformFunctionLikeToExpression(getAccessor, undefined, undefined, container);
+                var getterFunction = transformFunctionLikeToExpression(getAccessor, /*location*/ undefined, /*name*/ undefined, container);
                 ts.setSourceMapRange(getterFunction, ts.getSourceMapRange(getAccessor));
-                ts.setEmitFlags(getterFunction, 512);
+                ts.setEmitFlags(getterFunction, 512 /* NoLeadingComments */);
                 var getter = ts.createPropertyAssignment("get", getterFunction);
                 ts.setCommentRange(getter, ts.getCommentRange(getAccessor));
                 properties.push(getter);
             }
             if (setAccessor) {
-                var setterFunction = transformFunctionLikeToExpression(setAccessor, undefined, undefined, container);
+                var setterFunction = transformFunctionLikeToExpression(setAccessor, /*location*/ undefined, /*name*/ undefined, container);
                 ts.setSourceMapRange(setterFunction, ts.getSourceMapRange(setAccessor));
-                ts.setEmitFlags(setterFunction, 512);
+                ts.setEmitFlags(setterFunction, 512 /* NoLeadingComments */);
                 var setter = ts.createPropertyAssignment("set", setterFunction);
                 ts.setCommentRange(setter, ts.getCommentRange(setAccessor));
                 properties.push(setter);
             }
             properties.push(ts.createPropertyAssignment("enumerable", ts.createTrue()), ts.createPropertyAssignment("configurable", ts.createTrue()));
-            var call = ts.createCall(ts.createPropertyAccess(ts.createIdentifier("Object"), "defineProperty"), undefined, [
+            var call = ts.createCall(ts.createPropertyAccess(ts.createIdentifier("Object"), "defineProperty"), 
+            /*typeArguments*/ undefined, [
                 target,
                 propertyName,
-                ts.createObjectLiteral(properties, true)
+                ts.createObjectLiteral(properties, /*multiLine*/ true)
             ]);
             if (startsOnNewLine) {
                 ts.startOnNewLine(call);
             }
-            exitSubtree(ancestorFacts, 49152, hierarchyFacts & 49152 ? 16384 : 0);
+            exitSubtree(ancestorFacts, 49152 /* PropagateNewTargetMask */, hierarchyFacts & 49152 /* PropagateNewTargetMask */ ? 16384 /* NewTarget */ : 0 /* None */);
             return call;
         }
+        /**
+         * Visits an ArrowFunction and transforms it into a FunctionExpression.
+         *
+         * @param node An ArrowFunction node.
+         */
         function visitArrowFunction(node) {
-            if (node.transformFlags & 16384) {
+            if (node.transformFlags & 16384 /* ContainsLexicalThis */) {
                 enableSubstitutionsForCapturedThis();
             }
             var savedConvertedLoopState = convertedLoopState;
             convertedLoopState = undefined;
-            var ancestorFacts = enterSubtree(16256, 66);
-            var func = ts.createFunctionExpression(undefined, undefined, undefined, undefined, ts.visitParameterList(node.parameters, visitor, context), undefined, transformFunctionBody(node));
+            var ancestorFacts = enterSubtree(16256 /* ArrowFunctionExcludes */, 66 /* ArrowFunctionIncludes */);
+            var func = ts.createFunctionExpression(
+            /*modifiers*/ undefined, 
+            /*asteriskToken*/ undefined, 
+            /*name*/ undefined, 
+            /*typeParameters*/ undefined, ts.visitParameterList(node.parameters, visitor, context), 
+            /*type*/ undefined, transformFunctionBody(node));
             ts.setTextRange(func, node);
             ts.setOriginalNode(func, node);
-            ts.setEmitFlags(func, 8);
-            exitSubtree(ancestorFacts, 0, 0);
+            ts.setEmitFlags(func, 8 /* CapturesThis */);
+            exitSubtree(ancestorFacts, 0 /* None */, 0 /* None */);
             convertedLoopState = savedConvertedLoopState;
             return func;
         }
+        /**
+         * Visits a FunctionExpression node.
+         *
+         * @param node a FunctionExpression node.
+         */
         function visitFunctionExpression(node) {
-            var ancestorFacts = ts.getEmitFlags(node) & 262144
-                ? enterSubtree(16278, 69)
-                : enterSubtree(16286, 65);
+            var ancestorFacts = ts.getEmitFlags(node) & 262144 /* AsyncFunctionBody */
+                ? enterSubtree(16278 /* AsyncFunctionBodyExcludes */, 69 /* AsyncFunctionBodyIncludes */)
+                : enterSubtree(16286 /* FunctionExcludes */, 65 /* FunctionIncludes */);
             var savedConvertedLoopState = convertedLoopState;
             convertedLoopState = undefined;
             var parameters = ts.visitParameterList(node.parameters, visitor, context);
-            var body = node.transformFlags & 64
+            var body = node.transformFlags & 64 /* ES2015 */
                 ? transformFunctionBody(node)
                 : visitFunctionBodyDownLevel(node);
-            var name = hierarchyFacts & 16384
+            var name = hierarchyFacts & 16384 /* NewTarget */
                 ? ts.getLocalName(node)
                 : node.name;
-            exitSubtree(ancestorFacts, 49152, 0);
+            exitSubtree(ancestorFacts, 49152 /* PropagateNewTargetMask */, 0 /* None */);
             convertedLoopState = savedConvertedLoopState;
-            return ts.updateFunctionExpression(node, undefined, node.asteriskToken, name, undefined, parameters, undefined, body);
+            return ts.updateFunctionExpression(node, 
+            /*modifiers*/ undefined, node.asteriskToken, name, 
+            /*typeParameters*/ undefined, parameters, 
+            /*type*/ undefined, body);
         }
+        /**
+         * Visits a FunctionDeclaration node.
+         *
+         * @param node a FunctionDeclaration node.
+         */
         function visitFunctionDeclaration(node) {
             var savedConvertedLoopState = convertedLoopState;
             convertedLoopState = undefined;
-            var ancestorFacts = enterSubtree(16286, 65);
+            var ancestorFacts = enterSubtree(16286 /* FunctionExcludes */, 65 /* FunctionIncludes */);
             var parameters = ts.visitParameterList(node.parameters, visitor, context);
-            var body = node.transformFlags & 64
+            var body = node.transformFlags & 64 /* ES2015 */
                 ? transformFunctionBody(node)
                 : visitFunctionBodyDownLevel(node);
-            var name = hierarchyFacts & 16384
+            var name = hierarchyFacts & 16384 /* NewTarget */
                 ? ts.getLocalName(node)
                 : node.name;
-            exitSubtree(ancestorFacts, 49152, 0);
+            exitSubtree(ancestorFacts, 49152 /* PropagateNewTargetMask */, 0 /* None */);
             convertedLoopState = savedConvertedLoopState;
-            return ts.updateFunctionDeclaration(node, undefined, ts.visitNodes(node.modifiers, visitor, ts.isModifier), node.asteriskToken, name, undefined, parameters, undefined, body);
+            return ts.updateFunctionDeclaration(node, 
+            /*decorators*/ undefined, ts.visitNodes(node.modifiers, visitor, ts.isModifier), node.asteriskToken, name, 
+            /*typeParameters*/ undefined, parameters, 
+            /*type*/ undefined, body);
         }
+        /**
+         * Transforms a function-like node into a FunctionExpression.
+         *
+         * @param node The function-like node to transform.
+         * @param location The source-map location for the new FunctionExpression.
+         * @param name The name of the new FunctionExpression.
+         */
         function transformFunctionLikeToExpression(node, location, name, container) {
             var savedConvertedLoopState = convertedLoopState;
             convertedLoopState = undefined;
-            var ancestorFacts = container && ts.isClassLike(container) && !ts.hasModifier(node, 32)
-                ? enterSubtree(16286, 65 | 8)
-                : enterSubtree(16286, 65);
+            var ancestorFacts = container && ts.isClassLike(container) && !ts.hasModifier(node, 32 /* Static */)
+                ? enterSubtree(16286 /* FunctionExcludes */, 65 /* FunctionIncludes */ | 8 /* NonStaticClassElement */)
+                : enterSubtree(16286 /* FunctionExcludes */, 65 /* FunctionIncludes */);
             var parameters = ts.visitParameterList(node.parameters, visitor, context);
             var body = transformFunctionBody(node);
-            if (hierarchyFacts & 16384 && !name && (node.kind === 234 || node.kind === 192)) {
+            if (hierarchyFacts & 16384 /* NewTarget */ && !name && (node.kind === 234 /* FunctionDeclaration */ || node.kind === 192 /* FunctionExpression */)) {
                 name = ts.getGeneratedNameForNode(node);
             }
-            exitSubtree(ancestorFacts, 49152, 0);
+            exitSubtree(ancestorFacts, 49152 /* PropagateNewTargetMask */, 0 /* None */);
             convertedLoopState = savedConvertedLoopState;
-            return ts.setOriginalNode(ts.setTextRange(ts.createFunctionExpression(undefined, node.asteriskToken, name, undefined, parameters, undefined, body), location), node);
+            return ts.setOriginalNode(ts.setTextRange(ts.createFunctionExpression(
+            /*modifiers*/ undefined, node.asteriskToken, name, 
+            /*typeParameters*/ undefined, parameters, 
+            /*type*/ undefined, body), location), 
+            /*original*/ node);
         }
+        /**
+         * Transforms the body of a function-like node.
+         *
+         * @param node A function-like node.
+         */
         function transformFunctionBody(node) {
-            var multiLine = false;
-            var singleLine = false;
+            var multiLine = false; // indicates whether the block *must* be emitted as multiple lines
+            var singleLine = false; // indicates whether the block *may* be emitted as a single line
             var statementsLocation;
             var closeBraceLocation;
+            var leadingStatements = [];
             var statements = [];
             var body = node.body;
             var statementOffset;
             resumeLexicalEnvironment();
             if (ts.isBlock(body)) {
-                statementOffset = ts.addStandardPrologue(statements, body.statements, false);
-            }
-            addCaptureThisForNodeIfNeeded(statements, node);
-            addDefaultValueAssignmentsIfNeeded(statements, node);
-            addRestParameterIfNeeded(statements, node, false);
-            if (!multiLine && statements.length > 0) {
-                multiLine = true;
+                // ensureUseStrict is false because no new prologue-directive should be added.
+                // addStandardPrologue will put already-existing directives at the beginning of the target statement-array
+                statementOffset = ts.addStandardPrologue(leadingStatements, body.statements, /*ensureUseStrict*/ false);
             }
+            addCaptureThisForNodeIfNeeded(leadingStatements, node);
+            addDefaultValueAssignmentsIfNeeded(leadingStatements, node);
+            addRestParameterIfNeeded(leadingStatements, node, /*inConstructorWithSynthesizedSuper*/ false);
             if (ts.isBlock(body)) {
-                statementOffset = ts.addCustomPrologue(statements, body.statements, statementOffset, visitor);
+                // addCustomPrologue puts already-existing directives at the beginning of the target statement-array
+                statementOffset = ts.addCustomPrologue(leadingStatements, body.statements, statementOffset, visitor);
                 statementsLocation = body.statements;
                 ts.addRange(statements, ts.visitNodes(body.statements, visitor, ts.isStatement, statementOffset));
+                // If the original body was a multi-line block, this must be a multi-line block.
                 if (!multiLine && body.multiLine) {
                     multiLine = true;
                 }
             }
             else {
-                ts.Debug.assert(node.kind === 193);
+                ts.Debug.assert(node.kind === 193 /* ArrowFunction */);
+                // To align with the old emitter, we use a synthetic end position on the location
+                // for the statement list we synthesize when we down-level an arrow function with
+                // an expression function body. This prevents both comments and source maps from
+                // being emitted for the end position only.
                 statementsLocation = ts.moveRangeEnd(body, -1);
                 var equalsGreaterThanToken = node.equalsGreaterThanToken;
                 if (!ts.nodeIsSynthesized(equalsGreaterThanToken) && !ts.nodeIsSynthesized(body)) {
@@ -52940,72 +67030,103 @@ var ts;
                 var returnStatement = ts.createReturn(expression);
                 ts.setTextRange(returnStatement, body);
                 ts.moveSyntheticComments(returnStatement, body);
-                ts.setEmitFlags(returnStatement, 384 | 32 | 1024);
+                ts.setEmitFlags(returnStatement, 384 /* NoTokenSourceMaps */ | 32 /* NoTrailingSourceMap */ | 1024 /* NoTrailingComments */);
                 statements.push(returnStatement);
+                // To align with the source map emit for the old emitter, we set a custom
+                // source map location for the close brace.
                 closeBraceLocation = body;
             }
             var lexicalEnvironment = context.endLexicalEnvironment();
             ts.prependStatements(statements, lexicalEnvironment);
-            prependCaptureNewTargetIfNeeded(statements, node, false);
-            if (!multiLine && lexicalEnvironment && lexicalEnvironment.length) {
+            prependCaptureNewTargetIfNeeded(statements, node, /*copyOnWrite*/ false);
+            // If we added any final generated statements, this must be a multi-line block
+            if (ts.some(leadingStatements) || ts.some(lexicalEnvironment)) {
                 multiLine = true;
             }
-            var block = ts.createBlock(ts.setTextRange(ts.createNodeArray(statements), statementsLocation), multiLine);
+            var block = ts.createBlock(ts.setTextRange(ts.createNodeArray(leadingStatements.concat(statements)), statementsLocation), multiLine);
             ts.setTextRange(block, node.body);
             if (!multiLine && singleLine) {
-                ts.setEmitFlags(block, 1);
+                ts.setEmitFlags(block, 1 /* SingleLine */);
             }
             if (closeBraceLocation) {
-                ts.setTokenSourceMapRange(block, 18, closeBraceLocation);
+                ts.setTokenSourceMapRange(block, 18 /* CloseBraceToken */, closeBraceLocation);
             }
             ts.setOriginalNode(block, node.body);
             return block;
         }
         function visitFunctionBodyDownLevel(node) {
             var updated = ts.visitFunctionBody(node.body, functionBodyVisitor, context);
-            return ts.updateBlock(updated, ts.setTextRange(ts.createNodeArray(prependCaptureNewTargetIfNeeded(updated.statements, node, true)), updated.statements));
+            return ts.updateBlock(updated, ts.setTextRange(ts.createNodeArray(prependCaptureNewTargetIfNeeded(updated.statements, node, /*copyOnWrite*/ true)), 
+            /*location*/ updated.statements));
         }
         function visitBlock(node, isFunctionBody) {
             if (isFunctionBody) {
+                // A function body is not a block scope.
                 return ts.visitEachChild(node, visitor, context);
             }
-            var ancestorFacts = hierarchyFacts & 256
-                ? enterSubtree(4032, 512)
-                : enterSubtree(3904, 128);
+            var ancestorFacts = hierarchyFacts & 256 /* IterationStatement */
+                ? enterSubtree(4032 /* IterationStatementBlockExcludes */, 512 /* IterationStatementBlockIncludes */)
+                : enterSubtree(3904 /* BlockExcludes */, 128 /* BlockIncludes */);
             var updated = ts.visitEachChild(node, visitor, context);
-            exitSubtree(ancestorFacts, 0, 0);
+            exitSubtree(ancestorFacts, 0 /* None */, 0 /* None */);
             return updated;
         }
+        /**
+         * Visits an ExpressionStatement that contains a destructuring assignment.
+         *
+         * @param node An ExpressionStatement node.
+         */
         function visitExpressionStatement(node) {
+            // If we are here it is most likely because our expression is a destructuring assignment.
             switch (node.expression.kind) {
-                case 191:
-                    return ts.updateStatement(node, visitParenthesizedExpression(node.expression, false));
-                case 200:
-                    return ts.updateStatement(node, visitBinaryExpression(node.expression, false));
+                case 191 /* ParenthesizedExpression */:
+                    return ts.updateStatement(node, visitParenthesizedExpression(node.expression, /*needsDestructuringValue*/ false));
+                case 200 /* BinaryExpression */:
+                    return ts.updateStatement(node, visitBinaryExpression(node.expression, /*needsDestructuringValue*/ false));
             }
             return ts.visitEachChild(node, visitor, context);
         }
+        /**
+         * Visits a ParenthesizedExpression that may contain a destructuring assignment.
+         *
+         * @param node A ParenthesizedExpression node.
+         * @param needsDestructuringValue A value indicating whether we need to hold onto the rhs
+         *                                of a destructuring assignment.
+         */
         function visitParenthesizedExpression(node, needsDestructuringValue) {
+            // If we are here it is most likely because our expression is a destructuring assignment.
             if (!needsDestructuringValue) {
+                // By default we always emit the RHS at the end of a flattened destructuring
+                // expression. If we are in a state where we do not need the destructuring value,
+                // we pass that information along to the children that care about it.
                 switch (node.expression.kind) {
-                    case 191:
-                        return ts.updateParen(node, visitParenthesizedExpression(node.expression, false));
-                    case 200:
-                        return ts.updateParen(node, visitBinaryExpression(node.expression, false));
+                    case 191 /* ParenthesizedExpression */:
+                        return ts.updateParen(node, visitParenthesizedExpression(node.expression, /*needsDestructuringValue*/ false));
+                    case 200 /* BinaryExpression */:
+                        return ts.updateParen(node, visitBinaryExpression(node.expression, /*needsDestructuringValue*/ false));
                 }
             }
             return ts.visitEachChild(node, visitor, context);
         }
+        /**
+         * Visits a BinaryExpression that contains a destructuring assignment.
+         *
+         * @param node A BinaryExpression node.
+         * @param needsDestructuringValue A value indicating whether we need to hold onto the rhs
+         *                                of a destructuring assignment.
+         */
         function visitBinaryExpression(node, needsDestructuringValue) {
+            // If we are here it is because this is a destructuring assignment.
             if (ts.isDestructuringAssignment(node)) {
-                return ts.flattenDestructuringAssignment(node, visitor, context, 0, needsDestructuringValue);
+                return ts.flattenDestructuringAssignment(node, visitor, context, 0 /* All */, needsDestructuringValue);
             }
             return ts.visitEachChild(node, visitor, context);
         }
         function visitVariableStatement(node) {
-            var ancestorFacts = enterSubtree(0, ts.hasModifier(node, 1) ? 32 : 0);
+            var ancestorFacts = enterSubtree(0 /* None */, ts.hasModifier(node, 1 /* Export */) ? 32 /* ExportedVariableStatement */ : 0 /* None */);
             var updated;
-            if (convertedLoopState && (node.declarationList.flags & 3) === 0) {
+            if (convertedLoopState && (node.declarationList.flags & 3 /* BlockScoped */) === 0) {
+                // we are inside a converted loop - hoist variable declarations
                 var assignments = void 0;
                 for (var _i = 0, _a = node.declarationList.declarations; _i < _a.length; _i++) {
                     var decl = _a[_i];
@@ -53013,10 +67134,10 @@ var ts;
                     if (decl.initializer) {
                         var assignment = void 0;
                         if (ts.isBindingPattern(decl.name)) {
-                            assignment = ts.flattenDestructuringAssignment(decl, visitor, context, 0);
+                            assignment = ts.flattenDestructuringAssignment(decl, visitor, context, 0 /* All */);
                         }
                         else {
-                            assignment = ts.createBinary(decl.name, 58, ts.visitNode(decl.initializer, visitor, ts.isExpression));
+                            assignment = ts.createBinary(decl.name, 58 /* EqualsToken */, ts.visitNode(decl.initializer, visitor, ts.isExpression));
                             ts.setTextRange(assignment, decl);
                         }
                         assignments = ts.append(assignments, assignment);
@@ -53026,29 +67147,37 @@ var ts;
                     updated = ts.setTextRange(ts.createStatement(ts.inlineExpressions(assignments)), node);
                 }
                 else {
+                    // none of declarations has initializer - the entire variable statement can be deleted
                     updated = undefined;
                 }
             }
             else {
                 updated = ts.visitEachChild(node, visitor, context);
             }
-            exitSubtree(ancestorFacts, 0, 0);
+            exitSubtree(ancestorFacts, 0 /* None */, 0 /* None */);
             return updated;
         }
+        /**
+         * Visits a VariableDeclarationList that is block scoped (e.g. `let` or `const`).
+         *
+         * @param node A VariableDeclarationList node.
+         */
         function visitVariableDeclarationList(node) {
-            if (node.transformFlags & 64) {
-                if (node.flags & 3) {
+            if (node.transformFlags & 64 /* ES2015 */) {
+                if (node.flags & 3 /* BlockScoped */) {
                     enableSubstitutionsForBlockScopedBindings();
                 }
-                var declarations = ts.flatMap(node.declarations, node.flags & 1
+                var declarations = ts.flatMap(node.declarations, node.flags & 1 /* Let */
                     ? visitVariableDeclarationInLetDeclarationList
                     : visitVariableDeclaration);
                 var declarationList = ts.createVariableDeclarationList(declarations);
                 ts.setOriginalNode(declarationList, node);
                 ts.setTextRange(declarationList, node);
                 ts.setCommentRange(declarationList, node);
-                if (node.transformFlags & 8388608
+                if (node.transformFlags & 8388608 /* ContainsBindingPattern */
                     && (ts.isBindingPattern(node.declarations[0].name) || ts.isBindingPattern(ts.last(node.declarations).name))) {
+                    // If the first or last declaration is a binding pattern, we need to modify
+                    // the source map range for the declaration list.
                     var firstDeclaration = ts.firstOrUndefined(declarations);
                     if (firstDeclaration) {
                         ts.setSourceMapRange(declarationList, ts.createRange(firstDeclaration.pos, ts.last(declarations).end));
@@ -53058,23 +67187,76 @@ var ts;
             }
             return ts.visitEachChild(node, visitor, context);
         }
+        /**
+         * Gets a value indicating whether we should emit an explicit initializer for a variable
+         * declaration in a `let` declaration list.
+         *
+         * @param node A VariableDeclaration node.
+         */
         function shouldEmitExplicitInitializerForLetDeclaration(node) {
+            // Nested let bindings might need to be initialized explicitly to preserve
+            // ES6 semantic:
+            //
+            //  { let x = 1; }
+            //  { let x; } // x here should be undefined. not 1
+            //
+            // Top level bindings never collide with anything and thus don't require
+            // explicit initialization. As for nested let bindings there are two cases:
+            //
+            // - Nested let bindings that were not renamed definitely should be
+            //   initialized explicitly:
+            //
+            //    { let x = 1; }
+            //    { let x; if (some-condition) { x = 1}; if (x) { /*1*/ } }
+            //
+            //   Without explicit initialization code in /*1*/ can be executed even if
+            //   some-condition is evaluated to false.
+            //
+            // - Renaming introduces fresh name that should not collide with any
+            //   existing names, however renamed bindings sometimes also should be
+            //   explicitly initialized. One particular case: non-captured binding
+            //   declared inside loop body (but not in loop initializer):
+            //
+            //    let x;
+            //    for (;;) {
+            //        let x;
+            //    }
+            //
+            //   In downlevel codegen inner 'x' will be renamed so it won't collide
+            //   with outer 'x' however it will should be reset on every iteration as
+            //   if it was declared anew.
+            //
+            //   * Why non-captured binding?
+            //     - Because if loop contains block scoped binding captured in some
+            //       function then loop body will be rewritten to have a fresh scope
+            //       on every iteration so everything will just work.
+            //
+            //   * Why loop initializer is excluded?
+            //     - Since we've introduced a fresh name it already will be undefined.
             var flags = resolver.getNodeCheckFlags(node);
-            var isCapturedInFunction = flags & 131072;
-            var isDeclaredInLoop = flags & 262144;
-            var emittedAsTopLevel = (hierarchyFacts & 64) !== 0
+            var isCapturedInFunction = flags & 131072 /* CapturedBlockScopedBinding */;
+            var isDeclaredInLoop = flags & 262144 /* BlockScopedBindingInLoop */;
+            var emittedAsTopLevel = (hierarchyFacts & 64 /* TopLevel */) !== 0
                 || (isCapturedInFunction
                     && isDeclaredInLoop
-                    && (hierarchyFacts & 512) !== 0);
+                    && (hierarchyFacts & 512 /* IterationStatementBlock */) !== 0);
             var emitExplicitInitializer = !emittedAsTopLevel
-                && (hierarchyFacts & 2048) === 0
+                && (hierarchyFacts & 2048 /* ForInOrForOfStatement */) === 0
                 && (!resolver.isDeclarationWithCollidingName(node)
                     || (isDeclaredInLoop
                         && !isCapturedInFunction
-                        && (hierarchyFacts & (1024 | 2048)) === 0));
+                        && (hierarchyFacts & (1024 /* ForStatement */ | 2048 /* ForInOrForOfStatement */)) === 0));
             return emitExplicitInitializer;
         }
+        /**
+         * Visits a VariableDeclaration in a `let` declaration list.
+         *
+         * @param node A VariableDeclaration node.
+         */
         function visitVariableDeclarationInLetDeclarationList(node) {
+            // For binding pattern names that lack initializers there is no point to emit
+            // explicit initializer since downlevel codegen for destructuring will fail
+            // in the absence of initializer so all binding elements will say uninitialized
             var name = node.name;
             if (ts.isBindingPattern(name)) {
                 return visitVariableDeclaration(node);
@@ -53086,16 +67268,22 @@ var ts;
             }
             return ts.visitEachChild(node, visitor, context);
         }
+        /**
+         * Visits a VariableDeclaration node with a binding pattern.
+         *
+         * @param node A VariableDeclaration node.
+         */
         function visitVariableDeclaration(node) {
-            var ancestorFacts = enterSubtree(32, 0);
+            var ancestorFacts = enterSubtree(32 /* ExportedVariableStatement */, 0 /* None */);
             var updated;
             if (ts.isBindingPattern(node.name)) {
-                updated = ts.flattenDestructuringBinding(node, visitor, context, 0, undefined, (ancestorFacts & 32) !== 0);
+                updated = ts.flattenDestructuringBinding(node, visitor, context, 0 /* All */, 
+                /*value*/ undefined, (ancestorFacts & 32 /* ExportedVariableStatement */) !== 0);
             }
             else {
                 updated = ts.visitEachChild(node, visitor, context);
             }
-            exitSubtree(ancestorFacts, 0, 0);
+            exitSubtree(ancestorFacts, 0 /* None */, 0 /* None */);
             return updated;
         }
         function recordLabel(node) {
@@ -53109,67 +67297,78 @@ var ts;
                 convertedLoopState.labels = ts.createMap();
             }
             var statement = ts.unwrapInnermostStatementOfLabel(node, convertedLoopState && recordLabel);
-            return ts.isIterationStatement(statement, false)
-                ? visitIterationStatement(statement, node)
+            return ts.isIterationStatement(statement, /*lookInLabeledStatements*/ false)
+                ? visitIterationStatement(statement, /*outermostLabeledStatement*/ node)
                 : ts.restoreEnclosingLabel(ts.visitNode(statement, visitor, ts.isStatement), node, convertedLoopState && resetLabel);
         }
         function visitIterationStatement(node, outermostLabeledStatement) {
             switch (node.kind) {
-                case 218:
-                case 219:
+                case 218 /* DoStatement */:
+                case 219 /* WhileStatement */:
                     return visitDoOrWhileStatement(node, outermostLabeledStatement);
-                case 220:
+                case 220 /* ForStatement */:
                     return visitForStatement(node, outermostLabeledStatement);
-                case 221:
+                case 221 /* ForInStatement */:
                     return visitForInStatement(node, outermostLabeledStatement);
-                case 222:
+                case 222 /* ForOfStatement */:
                     return visitForOfStatement(node, outermostLabeledStatement);
             }
         }
         function visitIterationStatementWithFacts(excludeFacts, includeFacts, node, outermostLabeledStatement, convert) {
             var ancestorFacts = enterSubtree(excludeFacts, includeFacts);
             var updated = convertIterationStatementBodyIfNecessary(node, outermostLabeledStatement, convert);
-            exitSubtree(ancestorFacts, 0, 0);
+            exitSubtree(ancestorFacts, 0 /* None */, 0 /* None */);
             return updated;
         }
         function visitDoOrWhileStatement(node, outermostLabeledStatement) {
-            return visitIterationStatementWithFacts(0, 256, node, outermostLabeledStatement);
+            return visitIterationStatementWithFacts(0 /* DoOrWhileStatementExcludes */, 256 /* DoOrWhileStatementIncludes */, node, outermostLabeledStatement);
         }
         function visitForStatement(node, outermostLabeledStatement) {
-            return visitIterationStatementWithFacts(3008, 1280, node, outermostLabeledStatement);
+            return visitIterationStatementWithFacts(3008 /* ForStatementExcludes */, 1280 /* ForStatementIncludes */, node, outermostLabeledStatement);
         }
         function visitForInStatement(node, outermostLabeledStatement) {
-            return visitIterationStatementWithFacts(1984, 2304, node, outermostLabeledStatement);
+            return visitIterationStatementWithFacts(1984 /* ForInOrForOfStatementExcludes */, 2304 /* ForInOrForOfStatementIncludes */, node, outermostLabeledStatement);
         }
         function visitForOfStatement(node, outermostLabeledStatement) {
-            return visitIterationStatementWithFacts(1984, 2304, node, outermostLabeledStatement, compilerOptions.downlevelIteration ? convertForOfStatementForIterable : convertForOfStatementForArray);
+            return visitIterationStatementWithFacts(1984 /* ForInOrForOfStatementExcludes */, 2304 /* ForInOrForOfStatementIncludes */, node, outermostLabeledStatement, compilerOptions.downlevelIteration ? convertForOfStatementForIterable : convertForOfStatementForArray);
         }
         function convertForOfStatementHead(node, boundValue, convertedLoopBodyStatements) {
             var statements = [];
             var initializer = node.initializer;
             if (ts.isVariableDeclarationList(initializer)) {
-                if (node.initializer.flags & 3) {
+                if (node.initializer.flags & 3 /* BlockScoped */) {
                     enableSubstitutionsForBlockScopedBindings();
                 }
                 var firstOriginalDeclaration = ts.firstOrUndefined(initializer.declarations);
                 if (firstOriginalDeclaration && ts.isBindingPattern(firstOriginalDeclaration.name)) {
-                    var declarations = ts.flattenDestructuringBinding(firstOriginalDeclaration, visitor, context, 0, boundValue);
+                    // This works whether the declaration is a var, let, or const.
+                    // It will use rhsIterationValue _a[_i] as the initializer.
+                    var declarations = ts.flattenDestructuringBinding(firstOriginalDeclaration, visitor, context, 0 /* All */, boundValue);
                     var declarationList = ts.setTextRange(ts.createVariableDeclarationList(declarations), node.initializer);
                     ts.setOriginalNode(declarationList, node.initializer);
+                    // Adjust the source map range for the first declaration to align with the old
+                    // emitter.
                     ts.setSourceMapRange(declarationList, ts.createRange(declarations[0].pos, ts.last(declarations).end));
-                    statements.push(ts.createVariableStatement(undefined, declarationList));
+                    statements.push(ts.createVariableStatement(
+                    /*modifiers*/ undefined, declarationList));
                 }
                 else {
-                    statements.push(ts.setTextRange(ts.createVariableStatement(undefined, ts.setOriginalNode(ts.setTextRange(ts.createVariableDeclarationList([
-                        ts.createVariableDeclaration(firstOriginalDeclaration ? firstOriginalDeclaration.name : ts.createTempVariable(undefined), undefined, boundValue)
+                    // The following call does not include the initializer, so we have
+                    // to emit it separately.
+                    statements.push(ts.setTextRange(ts.createVariableStatement(
+                    /*modifiers*/ undefined, ts.setOriginalNode(ts.setTextRange(ts.createVariableDeclarationList([
+                        ts.createVariableDeclaration(firstOriginalDeclaration ? firstOriginalDeclaration.name : ts.createTempVariable(/*recordTempVariable*/ undefined), 
+                        /*type*/ undefined, boundValue)
                     ]), ts.moveRangePos(initializer, -1)), initializer)), ts.moveRangeEnd(initializer, -1)));
                 }
             }
             else {
+                // Initializer is an expression. Emit the expression in the body, so that it's
+                // evaluated on every iteration.
                 var assignment = ts.createAssignment(initializer, boundValue);
                 if (ts.isDestructuringAssignment(assignment)) {
                     ts.aggregateTransformFlags(assignment);
-                    statements.push(ts.createStatement(visitBinaryExpression(assignment, false)));
+                    statements.push(ts.createStatement(visitBinaryExpression(assignment, /*needsDestructuringValue*/ false)));
                 }
                 else {
                     assignment.end = initializer.end;
@@ -53191,62 +67390,111 @@ var ts;
             }
         }
         function createSyntheticBlockForConvertedStatements(statements) {
-            return ts.setEmitFlags(ts.createBlock(ts.createNodeArray(statements), true), 48 | 384);
+            return ts.setEmitFlags(ts.createBlock(ts.createNodeArray(statements), 
+            /*multiLine*/ true), 48 /* NoSourceMap */ | 384 /* NoTokenSourceMaps */);
         }
         function convertForOfStatementForArray(node, outermostLabeledStatement, convertedLoopBodyStatements) {
+            // The following ES6 code:
+            //
+            //    for (let v of expr) { }
+            //
+            // should be emitted as
+            //
+            //    for (var _i = 0, _a = expr; _i < _a.length; _i++) {
+            //        var v = _a[_i];
+            //    }
+            //
+            // where _a and _i are temps emitted to capture the RHS and the counter,
+            // respectively.
+            // When the left hand side is an expression instead of a let declaration,
+            // the "let v" is not emitted.
+            // When the left hand side is a let/const, the v is renamed if there is
+            // another v in scope.
+            // Note that all assignments to the LHS are emitted in the body, including
+            // all destructuring.
+            // Note also that because an extra statement is needed to assign to the LHS,
+            // for-of bodies are always emitted as blocks.
             var expression = ts.visitNode(node.expression, visitor, ts.isExpression);
+            // In the case where the user wrote an identifier as the RHS, like this:
+            //
+            //     for (let v of arr) { }
+            //
+            // we don't want to emit a temporary variable for the RHS, just use it directly.
             var counter = ts.createLoopVariable();
-            var rhsReference = ts.isIdentifier(expression) ? ts.getGeneratedNameForNode(expression) : ts.createTempVariable(undefined);
-            ts.setEmitFlags(expression, 48 | ts.getEmitFlags(expression));
-            var forStatement = ts.setTextRange(ts.createFor(ts.setEmitFlags(ts.setTextRange(ts.createVariableDeclarationList([
-                ts.setTextRange(ts.createVariableDeclaration(counter, undefined, ts.createLiteral(0)), ts.moveRangePos(node.expression, -1)),
-                ts.setTextRange(ts.createVariableDeclaration(rhsReference, undefined, expression), node.expression)
-            ]), node.expression), 2097152), ts.setTextRange(ts.createLessThan(counter, ts.createPropertyAccess(rhsReference, "length")), node.expression), ts.setTextRange(ts.createPostfixIncrement(counter), node.expression), convertForOfStatementHead(node, ts.createElementAccess(rhsReference, counter), convertedLoopBodyStatements)), node);
-            ts.setEmitFlags(forStatement, 256);
+            var rhsReference = ts.isIdentifier(expression) ? ts.getGeneratedNameForNode(expression) : ts.createTempVariable(/*recordTempVariable*/ undefined);
+            // The old emitter does not emit source maps for the expression
+            ts.setEmitFlags(expression, 48 /* NoSourceMap */ | ts.getEmitFlags(expression));
+            var forStatement = ts.setTextRange(ts.createFor(
+            /*initializer*/ ts.setEmitFlags(ts.setTextRange(ts.createVariableDeclarationList([
+                ts.setTextRange(ts.createVariableDeclaration(counter, /*type*/ undefined, ts.createLiteral(0)), ts.moveRangePos(node.expression, -1)),
+                ts.setTextRange(ts.createVariableDeclaration(rhsReference, /*type*/ undefined, expression), node.expression)
+            ]), node.expression), 2097152 /* NoHoisting */), 
+            /*condition*/ ts.setTextRange(ts.createLessThan(counter, ts.createPropertyAccess(rhsReference, "length")), node.expression), 
+            /*incrementor*/ ts.setTextRange(ts.createPostfixIncrement(counter), node.expression), 
+            /*statement*/ convertForOfStatementHead(node, ts.createElementAccess(rhsReference, counter), convertedLoopBodyStatements)), 
+            /*location*/ node);
+            // Disable trailing source maps for the OpenParenToken to align source map emit with the old emitter.
+            ts.setEmitFlags(forStatement, 256 /* NoTokenTrailingSourceMaps */);
             ts.setTextRange(forStatement, node);
             return ts.restoreEnclosingLabel(forStatement, outermostLabeledStatement, convertedLoopState && resetLabel);
         }
         function convertForOfStatementForIterable(node, outermostLabeledStatement, convertedLoopBodyStatements) {
             var expression = ts.visitNode(node.expression, visitor, ts.isExpression);
-            var iterator = ts.isIdentifier(expression) ? ts.getGeneratedNameForNode(expression) : ts.createTempVariable(undefined);
-            var result = ts.isIdentifier(expression) ? ts.getGeneratedNameForNode(iterator) : ts.createTempVariable(undefined);
+            var iterator = ts.isIdentifier(expression) ? ts.getGeneratedNameForNode(expression) : ts.createTempVariable(/*recordTempVariable*/ undefined);
+            var result = ts.isIdentifier(expression) ? ts.getGeneratedNameForNode(iterator) : ts.createTempVariable(/*recordTempVariable*/ undefined);
             var errorRecord = ts.createUniqueName("e");
             var catchVariable = ts.getGeneratedNameForNode(errorRecord);
-            var returnMethod = ts.createTempVariable(undefined);
+            var returnMethod = ts.createTempVariable(/*recordTempVariable*/ undefined);
             var values = ts.createValuesHelper(context, expression, node.expression);
-            var next = ts.createCall(ts.createPropertyAccess(iterator, "next"), undefined, []);
+            var next = ts.createCall(ts.createPropertyAccess(iterator, "next"), /*typeArguments*/ undefined, []);
             hoistVariableDeclaration(errorRecord);
             hoistVariableDeclaration(returnMethod);
-            var forStatement = ts.setEmitFlags(ts.setTextRange(ts.createFor(ts.setEmitFlags(ts.setTextRange(ts.createVariableDeclarationList([
-                ts.setTextRange(ts.createVariableDeclaration(iterator, undefined, values), node.expression),
-                ts.createVariableDeclaration(result, undefined, next)
-            ]), node.expression), 2097152), ts.createLogicalNot(ts.createPropertyAccess(result, "done")), ts.createAssignment(result, next), convertForOfStatementHead(node, ts.createPropertyAccess(result, "value"), convertedLoopBodyStatements)), node), 256);
+            var forStatement = ts.setEmitFlags(ts.setTextRange(ts.createFor(
+            /*initializer*/ ts.setEmitFlags(ts.setTextRange(ts.createVariableDeclarationList([
+                ts.setTextRange(ts.createVariableDeclaration(iterator, /*type*/ undefined, values), node.expression),
+                ts.createVariableDeclaration(result, /*type*/ undefined, next)
+            ]), node.expression), 2097152 /* NoHoisting */), 
+            /*condition*/ ts.createLogicalNot(ts.createPropertyAccess(result, "done")), 
+            /*incrementor*/ ts.createAssignment(result, next), 
+            /*statement*/ convertForOfStatementHead(node, ts.createPropertyAccess(result, "value"), convertedLoopBodyStatements)), 
+            /*location*/ node), 256 /* NoTokenTrailingSourceMaps */);
             return ts.createTry(ts.createBlock([
                 ts.restoreEnclosingLabel(forStatement, outermostLabeledStatement, convertedLoopState && resetLabel)
             ]), ts.createCatchClause(ts.createVariableDeclaration(catchVariable), ts.setEmitFlags(ts.createBlock([
                 ts.createStatement(ts.createAssignment(errorRecord, ts.createObjectLiteral([
                     ts.createPropertyAssignment("error", catchVariable)
                 ])))
-            ]), 1)), ts.createBlock([
-                ts.createTry(ts.createBlock([
-                    ts.setEmitFlags(ts.createIf(ts.createLogicalAnd(ts.createLogicalAnd(result, ts.createLogicalNot(ts.createPropertyAccess(result, "done"))), ts.createAssignment(returnMethod, ts.createPropertyAccess(iterator, "return"))), ts.createStatement(ts.createFunctionCall(returnMethod, iterator, []))), 1),
-                ]), undefined, ts.setEmitFlags(ts.createBlock([
-                    ts.setEmitFlags(ts.createIf(errorRecord, ts.createThrow(ts.createPropertyAccess(errorRecord, "error"))), 1)
-                ]), 1))
+            ]), 1 /* SingleLine */)), ts.createBlock([
+                ts.createTry(
+                /*tryBlock*/ ts.createBlock([
+                    ts.setEmitFlags(ts.createIf(ts.createLogicalAnd(ts.createLogicalAnd(result, ts.createLogicalNot(ts.createPropertyAccess(result, "done"))), ts.createAssignment(returnMethod, ts.createPropertyAccess(iterator, "return"))), ts.createStatement(ts.createFunctionCall(returnMethod, iterator, []))), 1 /* SingleLine */),
+                ]), 
+                /*catchClause*/ undefined, 
+                /*finallyBlock*/ ts.setEmitFlags(ts.createBlock([
+                    ts.setEmitFlags(ts.createIf(errorRecord, ts.createThrow(ts.createPropertyAccess(errorRecord, "error"))), 1 /* SingleLine */)
+                ]), 1 /* SingleLine */))
             ]));
         }
+        /**
+         * Visits an ObjectLiteralExpression with computed property names.
+         *
+         * @param node An ObjectLiteralExpression node.
+         */
         function visitObjectLiteralExpression(node) {
+            // We are here because a ComputedPropertyName was used somewhere in the expression.
             var properties = node.properties;
             var numProperties = properties.length;
+            // Find the first computed property.
+            // Everything until that point can be emitted as part of the initial object literal.
             var numInitialProperties = numProperties;
             var numInitialPropertiesWithoutYield = numProperties;
             for (var i = 0; i < numProperties; i++) {
                 var property = properties[i];
-                if ((property.transformFlags & 16777216 && hierarchyFacts & 4)
+                if ((property.transformFlags & 16777216 /* ContainsYield */ && hierarchyFacts & 4 /* AsyncFunctionBody */)
                     && i < numInitialPropertiesWithoutYield) {
                     numInitialPropertiesWithoutYield = i;
                 }
-                if (property.name.kind === 147) {
+                if (property.name.kind === 147 /* ComputedPropertyName */) {
                     numInitialProperties = i;
                     break;
                 }
@@ -53255,29 +67503,37 @@ var ts;
                 if (numInitialPropertiesWithoutYield < numInitialProperties) {
                     numInitialProperties = numInitialPropertiesWithoutYield;
                 }
+                // For computed properties, we need to create a unique handle to the object
+                // literal so we can modify it without risking internal assignments tainting the object.
                 var temp = ts.createTempVariable(hoistVariableDeclaration);
+                // Write out the first non-computed properties, then emit the rest through indexing on the temp variable.
                 var expressions = [];
-                var assignment = ts.createAssignment(temp, ts.setEmitFlags(ts.createObjectLiteral(ts.visitNodes(properties, visitor, ts.isObjectLiteralElementLike, 0, numInitialProperties), node.multiLine), 65536));
+                var assignment = ts.createAssignment(temp, ts.setEmitFlags(ts.createObjectLiteral(ts.visitNodes(properties, visitor, ts.isObjectLiteralElementLike, 0, numInitialProperties), node.multiLine), 65536 /* Indented */));
                 if (node.multiLine) {
                     ts.startOnNewLine(assignment);
                 }
                 expressions.push(assignment);
                 addObjectLiteralMembers(expressions, node, temp, numInitialProperties);
+                // We need to clone the temporary identifier so that we can write it on a
+                // new line
                 expressions.push(node.multiLine ? ts.startOnNewLine(ts.getMutableClone(temp)) : temp);
                 return ts.inlineExpressions(expressions);
             }
             return ts.visitEachChild(node, visitor, context);
         }
         function shouldConvertIterationStatementBody(node) {
-            return (resolver.getNodeCheckFlags(node) & 65536) !== 0;
+            return (resolver.getNodeCheckFlags(node) & 65536 /* LoopWithCapturedBlockScopedBinding */) !== 0;
         }
+        /**
+         * Records constituents of name for the given variable to be hoisted in the outer scope.
+         */
         function hoistVariableDeclarationDeclaredInConvertedLoop(state, node) {
             if (!state.hoistedLocalVariables) {
                 state.hoistedLocalVariables = [];
             }
             visit(node.name);
             function visit(node) {
-                if (node.kind === 71) {
+                if (node.kind === 71 /* Identifier */) {
                     state.hoistedLocalVariables.push(node);
                 }
                 else {
@@ -53294,11 +67550,13 @@ var ts;
             if (!shouldConvertIterationStatementBody(node)) {
                 var saveAllowedNonLabeledJumps = void 0;
                 if (convertedLoopState) {
+                    // we get here if we are trying to emit normal loop loop inside converted loop
+                    // set allowedNonLabeledJumps to Break | Continue to mark that break\continue inside the loop should be emitted as is
                     saveAllowedNonLabeledJumps = convertedLoopState.allowedNonLabeledJumps;
-                    convertedLoopState.allowedNonLabeledJumps = 2 | 4;
+                    convertedLoopState.allowedNonLabeledJumps = 2 /* Break */ | 4 /* Continue */;
                 }
                 var result = convert
-                    ? convert(node, outermostLabeledStatement, undefined)
+                    ? convert(node, outermostLabeledStatement, /*convertedLoopBodyStatements*/ undefined)
                     : ts.restoreEnclosingLabel(ts.visitEachChild(node, visitor, context), outermostLabeledStatement, convertedLoopState && resetLabel);
                 if (convertedLoopState) {
                     convertedLoopState.allowedNonLabeledJumps = saveAllowedNonLabeledJumps;
@@ -53308,18 +67566,20 @@ var ts;
             var functionName = ts.createUniqueName("_loop");
             var loopInitializer;
             switch (node.kind) {
-                case 220:
-                case 221:
-                case 222:
+                case 220 /* ForStatement */:
+                case 221 /* ForInStatement */:
+                case 222 /* ForOfStatement */:
                     var initializer = node.initializer;
-                    if (initializer && initializer.kind === 233) {
+                    if (initializer && initializer.kind === 233 /* VariableDeclarationList */) {
                         loopInitializer = initializer;
                     }
                     break;
             }
+            // variables that will be passed to the loop as parameters
             var loopParameters = [];
+            // variables declared in the loop initializer that will be changed inside the loop
             var loopOutParameters = [];
-            if (loopInitializer && (ts.getCombinedNodeFlags(loopInitializer) & 3)) {
+            if (loopInitializer && (ts.getCombinedNodeFlags(loopInitializer) & 3 /* BlockScoped */)) {
                 for (var _i = 0, _a = loopInitializer.declarations; _i < _a.length; _i++) {
                     var decl = _a[_i];
                     processLoopVariableDeclaration(decl, loopParameters, loopOutParameters);
@@ -53328,13 +67588,21 @@ var ts;
             var outerConvertedLoopState = convertedLoopState;
             convertedLoopState = { loopOutParameters: loopOutParameters };
             if (outerConvertedLoopState) {
+                // convertedOuterLoopState !== undefined means that this converted loop is nested in another converted loop.
+                // if outer converted loop has already accumulated some state - pass it through
                 if (outerConvertedLoopState.argumentsName) {
+                    // outer loop has already used 'arguments' so we've already have some name to alias it
+                    // use the same name in all nested loops
                     convertedLoopState.argumentsName = outerConvertedLoopState.argumentsName;
                 }
                 if (outerConvertedLoopState.thisName) {
+                    // outer loop has already used 'this' so we've already have some name to alias it
+                    // use the same name in all nested loops
                     convertedLoopState.thisName = outerConvertedLoopState.thisName;
                 }
                 if (outerConvertedLoopState.hoistedLocalVariables) {
+                    // we've already collected some non-block scoped variable declarations in enclosing loop
+                    // use the same storage in nested loop
                     convertedLoopState.hoistedLocalVariables = outerConvertedLoopState.hoistedLocalVariables;
                 }
             }
@@ -53346,61 +67614,83 @@ var ts;
             if (loopOutParameters.length || lexicalEnvironment) {
                 var statements_4 = ts.isBlock(loopBody) ? loopBody.statements.slice() : [loopBody];
                 if (loopOutParameters.length) {
-                    copyOutParameters(loopOutParameters, 1, statements_4);
+                    copyOutParameters(loopOutParameters, 1 /* ToOutParameter */, statements_4);
                 }
                 ts.prependStatements(statements_4, lexicalEnvironment);
-                loopBody = ts.createBlock(statements_4, true);
+                loopBody = ts.createBlock(statements_4, /*multiline*/ true);
             }
             if (ts.isBlock(loopBody)) {
                 loopBody.multiLine = true;
             }
             else {
-                loopBody = ts.createBlock([loopBody], true);
+                loopBody = ts.createBlock([loopBody], /*multiline*/ true);
             }
-            var containsYield = (node.statement.transformFlags & 16777216) !== 0;
-            var isAsyncBlockContainingAwait = containsYield && (hierarchyFacts & 4) !== 0;
+            var containsYield = (node.statement.transformFlags & 16777216 /* ContainsYield */) !== 0;
+            var isAsyncBlockContainingAwait = containsYield && (hierarchyFacts & 4 /* AsyncFunctionBody */) !== 0;
             var loopBodyFlags = 0;
             if (currentState.containsLexicalThis) {
-                loopBodyFlags |= 8;
+                loopBodyFlags |= 8 /* CapturesThis */;
             }
             if (isAsyncBlockContainingAwait) {
-                loopBodyFlags |= 262144;
+                loopBodyFlags |= 262144 /* AsyncFunctionBody */;
             }
-            var convertedLoopVariable = ts.createVariableStatement(undefined, ts.setEmitFlags(ts.createVariableDeclarationList([
-                ts.createVariableDeclaration(functionName, undefined, ts.setEmitFlags(ts.createFunctionExpression(undefined, containsYield ? ts.createToken(39) : undefined, undefined, undefined, loopParameters, undefined, loopBody), loopBodyFlags))
-            ]), 2097152));
+            var convertedLoopVariable = ts.createVariableStatement(
+            /*modifiers*/ undefined, ts.setEmitFlags(ts.createVariableDeclarationList([
+                ts.createVariableDeclaration(functionName, 
+                /*type*/ undefined, ts.setEmitFlags(ts.createFunctionExpression(
+                /*modifiers*/ undefined, containsYield ? ts.createToken(39 /* AsteriskToken */) : undefined, 
+                /*name*/ undefined, 
+                /*typeParameters*/ undefined, loopParameters, 
+                /*type*/ undefined, loopBody), loopBodyFlags))
+            ]), 2097152 /* NoHoisting */));
             var statements = [convertedLoopVariable];
             var extraVariableDeclarations;
+            // propagate state from the inner loop to the outer loop if necessary
             if (currentState.argumentsName) {
+                // if alias for arguments is set
                 if (outerConvertedLoopState) {
+                    // pass it to outer converted loop
                     outerConvertedLoopState.argumentsName = currentState.argumentsName;
                 }
                 else {
-                    (extraVariableDeclarations || (extraVariableDeclarations = [])).push(ts.createVariableDeclaration(currentState.argumentsName, undefined, ts.createIdentifier("arguments")));
+                    // this is top level converted loop and we need to create an alias for 'arguments' object
+                    (extraVariableDeclarations || (extraVariableDeclarations = [])).push(ts.createVariableDeclaration(currentState.argumentsName, 
+                    /*type*/ undefined, ts.createIdentifier("arguments")));
                 }
             }
             if (currentState.thisName) {
+                // if alias for this is set
                 if (outerConvertedLoopState) {
+                    // pass it to outer converted loop
                     outerConvertedLoopState.thisName = currentState.thisName;
                 }
                 else {
-                    (extraVariableDeclarations || (extraVariableDeclarations = [])).push(ts.createVariableDeclaration(currentState.thisName, undefined, ts.createIdentifier("this")));
+                    // this is top level converted loop so we need to create an alias for 'this' here
+                    // NOTE:
+                    // if converted loops were all nested in arrow function then we'll always emit '_this' so convertedLoopState.thisName will not be set.
+                    // If it is set this means that all nested loops are not nested in arrow function and it is safe to capture 'this'.
+                    (extraVariableDeclarations || (extraVariableDeclarations = [])).push(ts.createVariableDeclaration(currentState.thisName, 
+                    /*type*/ undefined, ts.createIdentifier("this")));
                 }
             }
             if (currentState.hoistedLocalVariables) {
+                // if hoistedLocalVariables !== undefined this means that we've possibly collected some variable declarations to be hoisted later
                 if (outerConvertedLoopState) {
+                    // pass them to outer converted loop
                     outerConvertedLoopState.hoistedLocalVariables = currentState.hoistedLocalVariables;
                 }
                 else {
                     if (!extraVariableDeclarations) {
                         extraVariableDeclarations = [];
                     }
+                    // hoist collected variable declarations
                     for (var _b = 0, _c = currentState.hoistedLocalVariables; _b < _c.length; _b++) {
                         var identifier = _c[_b];
                         extraVariableDeclarations.push(ts.createVariableDeclaration(identifier));
                     }
                 }
             }
+            // add extra variables to hold out parameters if necessary
             if (loopOutParameters.length) {
                 if (!extraVariableDeclarations) {
                     extraVariableDeclarations = [];
@@ -53410,8 +67700,10 @@ var ts;
                     extraVariableDeclarations.push(ts.createVariableDeclaration(outParam.outParamName));
                 }
             }
+            // create variable statement to hold all introduced variable declarations
             if (extraVariableDeclarations) {
-                statements.push(ts.createVariableStatement(undefined, ts.createVariableDeclarationList(extraVariableDeclarations)));
+                statements.push(ts.createVariableStatement(
+                /*modifiers*/ undefined, ts.createVariableDeclarationList(extraVariableDeclarations)));
             }
             var convertedLoopBodyStatements = generateCallToConvertedLoop(functionName, loopParameters, currentState, containsYield);
             var loop;
@@ -53420,9 +67712,13 @@ var ts;
             }
             else {
                 var clone_3 = ts.getMutableClone(node);
+                // clean statement part
                 clone_3.statement = undefined;
+                // visit childnodes to transform initializer/condition/incrementor parts
                 clone_3 = ts.visitEachChild(clone_3, visitor, context);
-                clone_3.statement = ts.createBlock(convertedLoopBodyStatements, true);
+                // set loop statement
+                clone_3.statement = ts.createBlock(convertedLoopBodyStatements, /*multiline*/ true);
+                // reset and re-aggregate the transform flags
                 clone_3.transformFlags = 0;
                 ts.aggregateTransformFlags(clone_3);
                 loop = ts.restoreEnclosingLabel(clone_3, outermostLabeledStatement, convertedLoopState && resetLabel);
@@ -53431,9 +67727,9 @@ var ts;
             return statements;
         }
         function copyOutParameter(outParam, copyDirection) {
-            var source = copyDirection === 0 ? outParam.outParamName : outParam.originalName;
-            var target = copyDirection === 0 ? outParam.originalName : outParam.outParamName;
-            return ts.createBinary(target, 58, source);
+            var source = copyDirection === 0 /* ToOriginal */ ? outParam.outParamName : outParam.originalName;
+            var target = copyDirection === 0 /* ToOriginal */ ? outParam.originalName : outParam.outParamName;
+            return ts.createBinary(target, 58 /* EqualsToken */, source);
         }
         function copyOutParameters(outParams, copyDirection, statements) {
             for (var _i = 0, outParams_1 = outParams; _i < outParams_1.length; _i++) {
@@ -53444,40 +67740,44 @@ var ts;
         function generateCallToConvertedLoop(loopFunctionExpressionName, parameters, state, isAsyncBlockContainingAwait) {
             var outerConvertedLoopState = convertedLoopState;
             var statements = [];
-            var isSimpleLoop = !(state.nonLocalJumps & ~4) &&
+            // loop is considered simple if it does not have any return statements or break\continue that transfer control outside of the loop
+            // simple loops are emitted as just 'loop()';
+            // NOTE: if loop uses only 'continue' it still will be emitted as simple loop
+            var isSimpleLoop = !(state.nonLocalJumps & ~4 /* Continue */) &&
                 !state.labeledNonLocalBreaks &&
                 !state.labeledNonLocalContinues;
-            var call = ts.createCall(loopFunctionExpressionName, undefined, ts.map(parameters, function (p) { return p.name; }));
+            var call = ts.createCall(loopFunctionExpressionName, /*typeArguments*/ undefined, ts.map(parameters, function (p) { return p.name; }));
             var callResult = isAsyncBlockContainingAwait
-                ? ts.createYield(ts.createToken(39), ts.setEmitFlags(call, 8388608))
+                ? ts.createYield(ts.createToken(39 /* AsteriskToken */), ts.setEmitFlags(call, 8388608 /* Iterator */))
                 : call;
             if (isSimpleLoop) {
                 statements.push(ts.createStatement(callResult));
-                copyOutParameters(state.loopOutParameters, 0, statements);
+                copyOutParameters(state.loopOutParameters, 0 /* ToOriginal */, statements);
             }
             else {
                 var loopResultName = ts.createUniqueName("state");
-                var stateVariable = ts.createVariableStatement(undefined, ts.createVariableDeclarationList([ts.createVariableDeclaration(loopResultName, undefined, callResult)]));
+                var stateVariable = ts.createVariableStatement(
+                /*modifiers*/ undefined, ts.createVariableDeclarationList([ts.createVariableDeclaration(loopResultName, /*type*/ undefined, callResult)]));
                 statements.push(stateVariable);
-                copyOutParameters(state.loopOutParameters, 0, statements);
-                if (state.nonLocalJumps & 8) {
+                copyOutParameters(state.loopOutParameters, 0 /* ToOriginal */, statements);
+                if (state.nonLocalJumps & 8 /* Return */) {
                     var returnStatement = void 0;
                     if (outerConvertedLoopState) {
-                        outerConvertedLoopState.nonLocalJumps |= 8;
+                        outerConvertedLoopState.nonLocalJumps |= 8 /* Return */;
                         returnStatement = ts.createReturn(loopResultName);
                     }
                     else {
                         returnStatement = ts.createReturn(ts.createPropertyAccess(loopResultName, "value"));
                     }
-                    statements.push(ts.createIf(ts.createBinary(ts.createTypeOf(loopResultName), 34, ts.createLiteral("object")), returnStatement));
+                    statements.push(ts.createIf(ts.createBinary(ts.createTypeOf(loopResultName), 34 /* EqualsEqualsEqualsToken */, ts.createLiteral("object")), returnStatement));
                 }
-                if (state.nonLocalJumps & 2) {
-                    statements.push(ts.createIf(ts.createBinary(loopResultName, 34, ts.createLiteral("break")), ts.createBreak()));
+                if (state.nonLocalJumps & 2 /* Break */) {
+                    statements.push(ts.createIf(ts.createBinary(loopResultName, 34 /* EqualsEqualsEqualsToken */, ts.createLiteral("break")), ts.createBreak()));
                 }
                 if (state.labeledNonLocalBreaks || state.labeledNonLocalContinues) {
                     var caseClauses = [];
-                    processLabeledJumps(state.labeledNonLocalBreaks, true, loopResultName, outerConvertedLoopState, caseClauses);
-                    processLabeledJumps(state.labeledNonLocalContinues, false, loopResultName, outerConvertedLoopState, caseClauses);
+                    processLabeledJumps(state.labeledNonLocalBreaks, /*isBreak*/ true, loopResultName, outerConvertedLoopState, caseClauses);
+                    processLabeledJumps(state.labeledNonLocalContinues, /*isBreak*/ false, loopResultName, outerConvertedLoopState, caseClauses);
                     statements.push(ts.createSwitch(loopResultName, ts.createCaseBlock(caseClauses)));
                 }
             }
@@ -53503,6 +67803,9 @@ var ts;
             }
             table.forEach(function (labelMarker, labelText) {
                 var statements = [];
+                // if there are no outer converted loop or outer label in question is located inside outer converted loop
+                // then emit labeled break\continue
+                // otherwise propagate pair 'label -> marker' to outer converted loop and emit 'return labelMarker' so outer loop can later decide what to do
                 if (!outerLoop || (outerLoop.labels && outerLoop.labels.get(labelText))) {
                     var label = ts.createIdentifier(labelText);
                     statements.push(isBreak ? ts.createBreak(label) : ts.createContinue(label));
@@ -53525,33 +67828,42 @@ var ts;
                 }
             }
             else {
-                loopParameters.push(ts.createParameter(undefined, undefined, undefined, name));
-                if (resolver.getNodeCheckFlags(decl) & 2097152) {
+                loopParameters.push(ts.createParameter(/*decorators*/ undefined, /*modifiers*/ undefined, /*dotDotDotToken*/ undefined, name));
+                if (resolver.getNodeCheckFlags(decl) & 2097152 /* NeedsLoopOutParameter */) {
                     var outParamName = ts.createUniqueName("out_" + ts.idText(name));
                     loopOutParameters.push({ originalName: name, outParamName: outParamName });
                 }
             }
         }
+        /**
+         * Adds the members of an object literal to an array of expressions.
+         *
+         * @param expressions An array of expressions.
+         * @param node An ObjectLiteralExpression node.
+         * @param receiver The receiver for members of the ObjectLiteralExpression.
+         * @param numInitialNonComputedProperties The number of initial properties without
+         *                                        computed property names.
+         */
         function addObjectLiteralMembers(expressions, node, receiver, start) {
             var properties = node.properties;
             var numProperties = properties.length;
             for (var i = start; i < numProperties; i++) {
                 var property = properties[i];
                 switch (property.kind) {
-                    case 156:
-                    case 157:
+                    case 156 /* GetAccessor */:
+                    case 157 /* SetAccessor */:
                         var accessors = ts.getAllAccessorDeclarations(node.properties, property);
                         if (property === accessors.firstAccessor) {
                             expressions.push(transformAccessorsToExpression(receiver, accessors, node, !!node.multiLine));
                         }
                         break;
-                    case 154:
+                    case 154 /* MethodDeclaration */:
                         expressions.push(transformObjectLiteralMethodDeclarationToExpression(property, receiver, node, node.multiLine));
                         break;
-                    case 270:
+                    case 270 /* PropertyAssignment */:
                         expressions.push(transformPropertyAssignmentToExpression(property, receiver, node.multiLine));
                         break;
-                    case 271:
+                    case 271 /* ShorthandPropertyAssignment */:
                         expressions.push(transformShorthandPropertyAssignmentToExpression(property, receiver, node.multiLine));
                         break;
                     default:
@@ -53560,6 +67872,13 @@ var ts;
                 }
             }
         }
+        /**
+         * Transforms a PropertyAssignment node into an expression.
+         *
+         * @param node The ObjectLiteralExpression that contains the PropertyAssignment.
+         * @param property The PropertyAssignment node.
+         * @param receiver The receiver for the assignment.
+         */
         function transformPropertyAssignmentToExpression(property, receiver, startsOnNewLine) {
             var expression = ts.createAssignment(ts.createMemberAccessForPropertyName(receiver, ts.visitNode(property.name, visitor, ts.isPropertyName)), ts.visitNode(property.initializer, visitor, ts.isExpression));
             ts.setTextRange(expression, property);
@@ -53568,6 +67887,13 @@ var ts;
             }
             return expression;
         }
+        /**
+         * Transforms a ShorthandPropertyAssignment node into an expression.
+         *
+         * @param node The ObjectLiteralExpression that contains the ShorthandPropertyAssignment.
+         * @param property The ShorthandPropertyAssignment node.
+         * @param receiver The receiver for the assignment.
+         */
         function transformShorthandPropertyAssignmentToExpression(property, receiver, startsOnNewLine) {
             var expression = ts.createAssignment(ts.createMemberAccessForPropertyName(receiver, ts.visitNode(property.name, visitor, ts.isPropertyName)), ts.getSynthesizedClone(property.name));
             ts.setTextRange(expression, property);
@@ -53576,103 +67902,201 @@ var ts;
             }
             return expression;
         }
+        /**
+         * Transforms a MethodDeclaration of an ObjectLiteralExpression into an expression.
+         *
+         * @param node The ObjectLiteralExpression that contains the MethodDeclaration.
+         * @param method The MethodDeclaration node.
+         * @param receiver The receiver for the assignment.
+         */
         function transformObjectLiteralMethodDeclarationToExpression(method, receiver, container, startsOnNewLine) {
-            var ancestorFacts = enterSubtree(0, 0);
-            var expression = ts.createAssignment(ts.createMemberAccessForPropertyName(receiver, ts.visitNode(method.name, visitor, ts.isPropertyName)), transformFunctionLikeToExpression(method, method, undefined, container));
+            var ancestorFacts = enterSubtree(0 /* None */, 0 /* None */);
+            var expression = ts.createAssignment(ts.createMemberAccessForPropertyName(receiver, ts.visitNode(method.name, visitor, ts.isPropertyName)), transformFunctionLikeToExpression(method, /*location*/ method, /*name*/ undefined, container));
             ts.setTextRange(expression, method);
             if (startsOnNewLine) {
                 ts.startOnNewLine(expression);
             }
-            exitSubtree(ancestorFacts, 49152, hierarchyFacts & 49152 ? 16384 : 0);
+            exitSubtree(ancestorFacts, 49152 /* PropagateNewTargetMask */, hierarchyFacts & 49152 /* PropagateNewTargetMask */ ? 16384 /* NewTarget */ : 0 /* None */);
             return expression;
         }
         function visitCatchClause(node) {
-            var ancestorFacts = enterSubtree(4032, 0);
+            var ancestorFacts = enterSubtree(4032 /* BlockScopeExcludes */, 0 /* BlockScopeIncludes */);
             var updated;
             ts.Debug.assert(!!node.variableDeclaration, "Catch clause variable should always be present when downleveling ES2015.");
             if (ts.isBindingPattern(node.variableDeclaration.name)) {
-                var temp = ts.createTempVariable(undefined);
+                var temp = ts.createTempVariable(/*recordTempVariable*/ undefined);
                 var newVariableDeclaration = ts.createVariableDeclaration(temp);
                 ts.setTextRange(newVariableDeclaration, node.variableDeclaration);
-                var vars = ts.flattenDestructuringBinding(node.variableDeclaration, visitor, context, 0, temp);
+                var vars = ts.flattenDestructuringBinding(node.variableDeclaration, visitor, context, 0 /* All */, temp);
                 var list = ts.createVariableDeclarationList(vars);
                 ts.setTextRange(list, node.variableDeclaration);
-                var destructure = ts.createVariableStatement(undefined, list);
+                var destructure = ts.createVariableStatement(/*modifiers*/ undefined, list);
                 updated = ts.updateCatchClause(node, newVariableDeclaration, addStatementToStartOfBlock(node.block, destructure));
             }
             else {
                 updated = ts.visitEachChild(node, visitor, context);
             }
-            exitSubtree(ancestorFacts, 0, 0);
+            exitSubtree(ancestorFacts, 0 /* None */, 0 /* None */);
             return updated;
         }
         function addStatementToStartOfBlock(block, statement) {
             var transformedStatements = ts.visitNodes(block.statements, visitor, ts.isStatement);
             return ts.updateBlock(block, [statement].concat(transformedStatements));
         }
+        /**
+         * Visits a MethodDeclaration of an ObjectLiteralExpression and transforms it into a
+         * PropertyAssignment.
+         *
+         * @param node A MethodDeclaration node.
+         */
         function visitMethodDeclaration(node) {
+            // We should only get here for methods on an object literal with regular identifier names.
+            // Methods on classes are handled in visitClassDeclaration/visitClassExpression.
+            // Methods with computed property names are handled in visitObjectLiteralExpression.
             ts.Debug.assert(!ts.isComputedPropertyName(node.name));
-            var functionExpression = transformFunctionLikeToExpression(node, ts.moveRangePos(node, -1), undefined, undefined);
-            ts.setEmitFlags(functionExpression, 512 | ts.getEmitFlags(functionExpression));
-            return ts.setTextRange(ts.createPropertyAssignment(node.name, functionExpression), node);
+            var functionExpression = transformFunctionLikeToExpression(node, /*location*/ ts.moveRangePos(node, -1), /*name*/ undefined, /*container*/ undefined);
+            ts.setEmitFlags(functionExpression, 512 /* NoLeadingComments */ | ts.getEmitFlags(functionExpression));
+            return ts.setTextRange(ts.createPropertyAssignment(node.name, functionExpression), 
+            /*location*/ node);
         }
+        /**
+         * Visits an AccessorDeclaration of an ObjectLiteralExpression.
+         *
+         * @param node An AccessorDeclaration node.
+         */
         function visitAccessorDeclaration(node) {
             ts.Debug.assert(!ts.isComputedPropertyName(node.name));
             var savedConvertedLoopState = convertedLoopState;
             convertedLoopState = undefined;
-            var ancestorFacts = enterSubtree(16286, 65);
+            var ancestorFacts = enterSubtree(16286 /* FunctionExcludes */, 65 /* FunctionIncludes */);
             var updated;
             var parameters = ts.visitParameterList(node.parameters, visitor, context);
-            var body = node.transformFlags & (32768 | 128)
+            var body = node.transformFlags & (32768 /* ContainsCapturedLexicalThis */ | 128 /* ContainsES2015 */)
                 ? transformFunctionBody(node)
                 : visitFunctionBodyDownLevel(node);
-            if (node.kind === 156) {
+            if (node.kind === 156 /* GetAccessor */) {
                 updated = ts.updateGetAccessor(node, node.decorators, node.modifiers, node.name, parameters, node.type, body);
             }
             else {
                 updated = ts.updateSetAccessor(node, node.decorators, node.modifiers, node.name, parameters, body);
             }
-            exitSubtree(ancestorFacts, 49152, 0);
+            exitSubtree(ancestorFacts, 49152 /* PropagateNewTargetMask */, 0 /* None */);
             convertedLoopState = savedConvertedLoopState;
             return updated;
         }
+        /**
+         * Visits a ShorthandPropertyAssignment and transforms it into a PropertyAssignment.
+         *
+         * @param node A ShorthandPropertyAssignment node.
+         */
         function visitShorthandPropertyAssignment(node) {
-            return ts.setTextRange(ts.createPropertyAssignment(node.name, ts.getSynthesizedClone(node.name)), node);
+            return ts.setTextRange(ts.createPropertyAssignment(node.name, ts.getSynthesizedClone(node.name)), 
+            /*location*/ node);
         }
         function visitComputedPropertyName(node) {
-            var ancestorFacts = enterSubtree(0, 8192);
+            var ancestorFacts = enterSubtree(0 /* ComputedPropertyNameExcludes */, 8192 /* ComputedPropertyNameIncludes */);
             var updated = ts.visitEachChild(node, visitor, context);
-            exitSubtree(ancestorFacts, 49152, hierarchyFacts & 49152 ? 32768 : 0);
+            exitSubtree(ancestorFacts, 49152 /* PropagateNewTargetMask */, hierarchyFacts & 49152 /* PropagateNewTargetMask */ ? 32768 /* NewTargetInComputedPropertyName */ : 0 /* None */);
             return updated;
         }
+        /**
+         * Visits a YieldExpression node.
+         *
+         * @param node A YieldExpression node.
+         */
         function visitYieldExpression(node) {
+            // `yield` expressions are transformed using the generators transformer.
             return ts.visitEachChild(node, visitor, context);
         }
+        /**
+         * Visits an ArrayLiteralExpression that contains a spread element.
+         *
+         * @param node An ArrayLiteralExpression node.
+         */
         function visitArrayLiteralExpression(node) {
-            if (node.transformFlags & 64) {
-                return transformAndSpreadElements(node.elements, true, !!node.multiLine, !!node.elements.hasTrailingComma);
+            if (node.transformFlags & 64 /* ES2015 */) {
+                // We are here because we contain a SpreadElementExpression.
+                return transformAndSpreadElements(node.elements, /*needsUniqueCopy*/ true, !!node.multiLine, /*hasTrailingComma*/ !!node.elements.hasTrailingComma);
             }
             return ts.visitEachChild(node, visitor, context);
         }
+        /**
+         * Visits a CallExpression that contains either a spread element or `super`.
+         *
+         * @param node a CallExpression.
+         */
         function visitCallExpression(node) {
-            if (ts.getEmitFlags(node) & 33554432) {
+            if (ts.getEmitFlags(node) & 33554432 /* TypeScriptClassWrapper */) {
                 return visitTypeScriptClassWrapper(node);
             }
-            if (node.transformFlags & 64) {
-                return visitCallExpressionWithPotentialCapturedThisAssignment(node, true);
+            if (node.transformFlags & 64 /* ES2015 */) {
+                return visitCallExpressionWithPotentialCapturedThisAssignment(node, /*assignToCapturedThis*/ true);
             }
-            return ts.updateCall(node, ts.visitNode(node.expression, callExpressionVisitor, ts.isExpression), undefined, ts.visitNodes(node.arguments, visitor, ts.isExpression));
+            return ts.updateCall(node, ts.visitNode(node.expression, callExpressionVisitor, ts.isExpression), 
+            /*typeArguments*/ undefined, ts.visitNodes(node.arguments, visitor, ts.isExpression));
         }
         function visitTypeScriptClassWrapper(node) {
+            // This is a call to a class wrapper function (an IIFE) created by the 'ts' transformer.
+            // The wrapper has a form similar to:
+            //
+            //  (function() {
+            //      class C { // 1
+            //      }
+            //      C.x = 1; // 2
+            //      return C;
+            //  }())
+            //
+            // When we transform the class, we end up with something like this:
+            //
+            //  (function () {
+            //      var C = (function () { // 3
+            //          function C() {
+            //          }
+            //          return C; // 4
+            //      }());
+            //      C.x = 1;
+            //      return C;
+            //  }())
+            //
+            // We want to simplify the two nested IIFEs to end up with something like this:
+            //
+            //  (function () {
+            //      function C() {
+            //      }
+            //      C.x = 1;
+            //      return C;
+            //  }())
+            // We skip any outer expressions in a number of places to get to the innermost
+            // expression, but we will restore them later to preserve comments and source maps.
             var body = ts.cast(ts.cast(ts.skipOuterExpressions(node.expression), ts.isArrowFunction).body, ts.isBlock);
+            // The class statements are the statements generated by visiting the first statement with initializer of the
+            // body (1), while all other statements are added to remainingStatements (2)
             var isVariableStatementWithInitializer = function (stmt) { return ts.isVariableStatement(stmt) && !!ts.first(stmt.declarationList.declarations).initializer; };
             var bodyStatements = ts.visitNodes(body.statements, visitor, ts.isStatement);
             var classStatements = ts.filter(bodyStatements, isVariableStatementWithInitializer);
             var remainingStatements = ts.filter(bodyStatements, function (stmt) { return !isVariableStatementWithInitializer(stmt); });
             var varStatement = ts.cast(ts.first(classStatements), ts.isVariableStatement);
+            // We know there is only one variable declaration here as we verified this in an
+            // earlier call to isTypeScriptClassWrapper
             var variable = varStatement.declarationList.declarations[0];
             var initializer = ts.skipOuterExpressions(variable.initializer);
+            // Under certain conditions, the 'ts' transformer may introduce a class alias, which
+            // we see as an assignment, for example:
+            //
+            //  (function () {
+            //      var C_1;
+            //      var C = C_1 = (function () {
+            //          function C() {
+            //          }
+            //          C.x = function () { return C_1; }
+            //          return C;
+            //      }());
+            //      C = C_1 = __decorate([dec], C);
+            //      return C;
+            //  }())
+            //
             var aliasAssignment = ts.tryCast(initializer, ts.isAssignmentExpression);
+            // The underlying call (3) is another IIFE that may contain a '_super' argument.
             var call = ts.cast(aliasAssignment ? ts.skipOuterExpressions(aliasAssignment.right) : initializer, ts.isCallExpression);
             var func = ts.cast(ts.skipOuterExpressions(call.expression), ts.isFunctionExpression);
             var funcStatements = func.body.statements;
@@ -53680,47 +68104,92 @@ var ts;
             var classBodyEnd = -1;
             var statements = [];
             if (aliasAssignment) {
+                // If we have a class alias assignment, we need to move it to the down-level constructor
+                // function we generated for the class.
                 var extendsCall = ts.tryCast(funcStatements[classBodyStart], ts.isExpressionStatement);
                 if (extendsCall) {
                     statements.push(extendsCall);
                     classBodyStart++;
                 }
+                // The next statement is the function declaration.
                 statements.push(funcStatements[classBodyStart]);
                 classBodyStart++;
+                // Add the class alias following the declaration.
                 statements.push(ts.createStatement(ts.createAssignment(aliasAssignment.left, ts.cast(variable.name, ts.isIdentifier))));
             }
+            // Find the trailing 'return' statement (4)
             while (!ts.isReturnStatement(ts.elementAt(funcStatements, classBodyEnd))) {
                 classBodyEnd--;
             }
+            // When we extract the statements of the inner IIFE, we exclude the 'return' statement (4)
+            // as we already have one that has been introduced by the 'ts' transformer.
             ts.addRange(statements, funcStatements, classBodyStart, classBodyEnd);
             if (classBodyEnd < -1) {
+                // If there were any hoisted declarations following the return statement, we should
+                // append them.
                 ts.addRange(statements, funcStatements, classBodyEnd + 1);
             }
+            // Add the remaining statements of the outer wrapper.
             ts.addRange(statements, remainingStatements);
-            ts.addRange(statements, classStatements, 1);
-            return ts.recreateOuterExpressions(node.expression, ts.recreateOuterExpressions(variable.initializer, ts.recreateOuterExpressions(aliasAssignment && aliasAssignment.right, ts.updateCall(call, ts.recreateOuterExpressions(call.expression, ts.updateFunctionExpression(func, undefined, undefined, undefined, undefined, func.parameters, undefined, ts.updateBlock(func.body, statements))), undefined, call.arguments))));
+            // The 'es2015' class transform may add an end-of-declaration marker. If so we will add it
+            // after the remaining statements from the 'ts' transformer.
+            ts.addRange(statements, classStatements, /*start*/ 1);
+            // Recreate any outer parentheses or partially-emitted expressions to preserve source map
+            // and comment locations.
+            return ts.recreateOuterExpressions(node.expression, ts.recreateOuterExpressions(variable.initializer, ts.recreateOuterExpressions(aliasAssignment && aliasAssignment.right, ts.updateCall(call, ts.recreateOuterExpressions(call.expression, ts.updateFunctionExpression(func, 
+            /*modifiers*/ undefined, 
+            /*asteriskToken*/ undefined, 
+            /*name*/ undefined, 
+            /*typeParameters*/ undefined, func.parameters, 
+            /*type*/ undefined, ts.updateBlock(func.body, statements))), 
+            /*typeArguments*/ undefined, call.arguments))));
         }
         function visitImmediateSuperCallInBody(node) {
-            return visitCallExpressionWithPotentialCapturedThisAssignment(node, false);
+            return visitCallExpressionWithPotentialCapturedThisAssignment(node, /*assignToCapturedThis*/ false);
         }
         function visitCallExpressionWithPotentialCapturedThisAssignment(node, assignToCapturedThis) {
-            if (node.transformFlags & 524288 ||
-                node.expression.kind === 97 ||
+            // We are here either because SuperKeyword was used somewhere in the expression, or
+            // because we contain a SpreadElementExpression.
+            if (node.transformFlags & 524288 /* ContainsSpread */ ||
+                node.expression.kind === 97 /* SuperKeyword */ ||
                 ts.isSuperProperty(ts.skipOuterExpressions(node.expression))) {
                 var _a = ts.createCallBinding(node.expression, hoistVariableDeclaration), target = _a.target, thisArg = _a.thisArg;
-                if (node.expression.kind === 97) {
-                    ts.setEmitFlags(thisArg, 4);
+                if (node.expression.kind === 97 /* SuperKeyword */) {
+                    ts.setEmitFlags(thisArg, 4 /* NoSubstitution */);
                 }
                 var resultingCall = void 0;
-                if (node.transformFlags & 524288) {
-                    resultingCall = ts.createFunctionApply(ts.visitNode(target, callExpressionVisitor, ts.isExpression), ts.visitNode(thisArg, visitor, ts.isExpression), transformAndSpreadElements(node.arguments, false, false, false));
+                if (node.transformFlags & 524288 /* ContainsSpread */) {
+                    // [source]
+                    //      f(...a, b)
+                    //      x.m(...a, b)
+                    //      super(...a, b)
+                    //      super.m(...a, b) // in static
+                    //      super.m(...a, b) // in instance
+                    //
+                    // [output]
+                    //      f.apply(void 0, a.concat([b]))
+                    //      (_a = x).m.apply(_a, a.concat([b]))
+                    //      _super.apply(this, a.concat([b]))
+                    //      _super.m.apply(this, a.concat([b]))
+                    //      _super.prototype.m.apply(this, a.concat([b]))
+                    resultingCall = ts.createFunctionApply(ts.visitNode(target, callExpressionVisitor, ts.isExpression), ts.visitNode(thisArg, visitor, ts.isExpression), transformAndSpreadElements(node.arguments, /*needsUniqueCopy*/ false, /*multiLine*/ false, /*hasTrailingComma*/ false));
                 }
                 else {
-                    resultingCall = ts.createFunctionCall(ts.visitNode(target, callExpressionVisitor, ts.isExpression), ts.visitNode(thisArg, visitor, ts.isExpression), ts.visitNodes(node.arguments, visitor, ts.isExpression), node);
+                    // [source]
+                    //      super(a)
+                    //      super.m(a) // in static
+                    //      super.m(a) // in instance
+                    //
+                    // [output]
+                    //      _super.call(this, a)
+                    //      _super.m.call(this, a)
+                    //      _super.prototype.m.call(this, a)
+                    resultingCall = ts.createFunctionCall(ts.visitNode(target, callExpressionVisitor, ts.isExpression), ts.visitNode(thisArg, visitor, ts.isExpression), ts.visitNodes(node.arguments, visitor, ts.isExpression), 
+                    /*location*/ node);
                 }
-                if (node.expression.kind === 97) {
+                if (node.expression.kind === 97 /* SuperKeyword */) {
                     var actualThis = ts.createThis();
-                    ts.setEmitFlags(actualThis, 4);
+                    ts.setEmitFlags(actualThis, 4 /* NoSubstitution */);
                     var initializer = ts.createLogicalOr(resultingCall, actualThis);
                     resultingCall = assignToCapturedThis
                         ? ts.createAssignment(ts.createFileLevelUniqueName("_this"), initializer)
@@ -53730,14 +68199,40 @@ var ts;
             }
             return ts.visitEachChild(node, visitor, context);
         }
+        /**
+         * Visits a NewExpression that contains a spread element.
+         *
+         * @param node A NewExpression node.
+         */
         function visitNewExpression(node) {
-            if (node.transformFlags & 524288) {
+            if (node.transformFlags & 524288 /* ContainsSpread */) {
+                // We are here because we contain a SpreadElementExpression.
+                // [source]
+                //      new C(...a)
+                //
+                // [output]
+                //      new ((_a = C).bind.apply(_a, [void 0].concat(a)))()
                 var _a = ts.createCallBinding(ts.createPropertyAccess(node.expression, "bind"), hoistVariableDeclaration), target = _a.target, thisArg = _a.thisArg;
-                return ts.createNew(ts.createFunctionApply(ts.visitNode(target, visitor, ts.isExpression), thisArg, transformAndSpreadElements(ts.createNodeArray([ts.createVoidZero()].concat(node.arguments)), false, false, false)), undefined, []);
+                return ts.createNew(ts.createFunctionApply(ts.visitNode(target, visitor, ts.isExpression), thisArg, transformAndSpreadElements(ts.createNodeArray([ts.createVoidZero()].concat(node.arguments)), /*needsUniqueCopy*/ false, /*multiLine*/ false, /*hasTrailingComma*/ false)), 
+                /*typeArguments*/ undefined, []);
             }
             return ts.visitEachChild(node, visitor, context);
         }
+        /**
+         * Transforms an array of Expression nodes that contains a SpreadExpression.
+         *
+         * @param elements The array of Expression nodes.
+         * @param needsUniqueCopy A value indicating whether to ensure that the result is a fresh array.
+         * @param multiLine A value indicating whether the result should be emitted on multiple lines.
+         */
         function transformAndSpreadElements(elements, needsUniqueCopy, multiLine, hasTrailingComma) {
+            // [source]
+            //      [a, ...b, c]
+            //
+            // [output]
+            //      [a].concat(b, [c])
+            // Map spans of spread expressions into their expressions and spans of other
+            // expressions into an array literal.
             var numElements = elements.length;
             var segments = ts.flatten(ts.spanMap(elements, partitionSpread, function (partition, visitPartition, _start, end) {
                 return visitPartition(partition, multiLine, hasTrailingComma && end === numElements);
@@ -53747,7 +68242,7 @@ var ts;
                     var firstSegment = segments[0];
                     if (ts.isCallExpression(firstSegment)
                         && ts.isIdentifier(firstSegment.expression)
-                        && (ts.getEmitFlags(firstSegment.expression) & 4096)
+                        && (ts.getEmitFlags(firstSegment.expression) & 4096 /* HelperName */)
                         && firstSegment.expression.escapedText === "___spread") {
                         return segments[0];
                     }
@@ -53757,10 +68252,11 @@ var ts;
             else {
                 if (segments.length === 1) {
                     var firstElement = elements[0];
-                    return needsUniqueCopy && ts.isSpreadElement(firstElement) && firstElement.expression.kind !== 183
+                    return needsUniqueCopy && ts.isSpreadElement(firstElement) && firstElement.expression.kind !== 183 /* ArrayLiteralExpression */
                         ? ts.createArraySlice(segments[0])
                         : segments[0];
                 }
+                // Rewrite using the pattern <segment0>.concat(<segment1>, <segment2>, ...)
                 return ts.createArrayConcat(segments.shift(), segments);
             }
         }
@@ -53778,26 +68274,55 @@ var ts;
         function visitSpreadElement(node) {
             return ts.visitNode(node.expression, visitor, ts.isExpression);
         }
+        /**
+         * Transforms the expression of a SpreadExpression node.
+         *
+         * @param node A SpreadExpression node.
+         */
         function visitExpressionOfSpread(node) {
             return ts.visitNode(node.expression, visitor, ts.isExpression);
         }
+        /**
+         * Visits a template literal.
+         *
+         * @param node A template literal.
+         */
         function visitTemplateLiteral(node) {
             return ts.setTextRange(ts.createLiteral(node.text), node);
         }
+        /**
+         * Visits a string literal with an extended unicode escape.
+         *
+         * @param node A string literal.
+         */
         function visitStringLiteral(node) {
             if (node.hasExtendedUnicodeEscape) {
                 return ts.setTextRange(ts.createLiteral(node.text), node);
             }
             return node;
         }
+        /**
+         * Visits a binary or octal (ES6) numeric literal.
+         *
+         * @param node A string literal.
+         */
         function visitNumericLiteral(node) {
-            if (node.numericLiteralFlags & 384) {
+            if (node.numericLiteralFlags & 384 /* BinaryOrOctalSpecifier */) {
                 return ts.setTextRange(ts.createNumericLiteral(node.text), node);
             }
             return node;
         }
+        /**
+         * Visits a TaggedTemplateExpression node.
+         *
+         * @param node A TaggedTemplateExpression node.
+         */
         function visitTaggedTemplateExpression(node) {
+            // Visit the tag expression
             var tag = ts.visitNode(node.tag, visitor, ts.isExpression);
+            // Build up the template arguments and the raw and cooked strings for the template.
+            // We start out with 'undefined' for the first argument and revisit later
+            // to avoid walking over the template string twice and shifting all our arguments over after the fact.
             var templateArguments = [undefined];
             var cookedStrings = [];
             var rawStrings = [];
@@ -53817,6 +68342,9 @@ var ts;
                 }
             }
             var helperCall = createTemplateObjectHelper(context, ts.createArrayLiteral(cookedStrings), ts.createArrayLiteral(rawStrings));
+            // Create a variable to cache the template object if we're in a module.
+            // Do not do this in the global scope, as any variable we currently generate could conflict with
+            // variables from outside of the current compilation. In the future, we can revisit this behavior.
             if (ts.isExternalModule(currentSourceFile)) {
                 var tempVar = ts.createUniqueName("templateObject");
                 recordTaggedTemplateString(tempVar);
@@ -53825,19 +68353,48 @@ var ts;
             else {
                 templateArguments[0] = helperCall;
             }
-            return ts.createCall(tag, undefined, templateArguments);
+            return ts.createCall(tag, /*typeArguments*/ undefined, templateArguments);
         }
+        /**
+         * Creates an ES5 compatible literal from an ES6 template literal.
+         *
+         * @param node The ES6 template literal.
+         */
         function getRawLiteral(node) {
+            // Find original source text, since we need to emit the raw strings of the tagged template.
+            // The raw strings contain the (escaped) strings of what the user wrote.
+            // Examples: `\n` is converted to "\\n", a template string with a newline to "\n".
             var text = ts.getSourceTextOfNodeFromSourceFile(currentSourceFile, node);
-            var isLast = node.kind === 13 || node.kind === 16;
+            // text contains the original source, it will also contain quotes ("`"), dolar signs and braces ("${" and "}"),
+            // thus we need to remove those characters.
+            // First template piece starts with "`", others with "}"
+            // Last template piece ends with "`", others with "${"
+            var isLast = node.kind === 13 /* NoSubstitutionTemplateLiteral */ || node.kind === 16 /* TemplateTail */;
             text = text.substring(1, text.length - (isLast ? 1 : 2));
+            // Newline normalization:
+            // ES6 Spec 11.8.6.1 - Static Semantics of TV's and TRV's
+            // <CR><LF> and <CR> LineTerminatorSequences are normalized to <LF> for both TV and TRV.
             text = text.replace(/\r\n?/g, "\n");
             return ts.setTextRange(ts.createLiteral(text), node);
         }
+        /**
+         * Visits a TemplateExpression node.
+         *
+         * @param node A TemplateExpression node.
+         */
         function visitTemplateExpression(node) {
             var expressions = [];
             addTemplateHead(expressions, node);
             addTemplateSpans(expressions, node);
+            // createAdd will check if each expression binds less closely than binary '+'.
+            // If it does, it wraps the expression in parentheses. Otherwise, something like
+            //    `abc${ 1 << 2 }`
+            // becomes
+            //    "abc" + 1 << 2 + ""
+            // which is really
+            //    ("abc" + 1) << (2 + "")
+            // rather than
+            //    "abc" + (1 << 2) + ""
             var expression = ts.reduceLeft(expressions, ts.createAdd);
             if (ts.nodeIsSynthesized(expression)) {
                 expression.pos = node.pos;
@@ -53845,76 +68402,137 @@ var ts;
             }
             return expression;
         }
+        /**
+         * Gets a value indicating whether we need to include the head of a TemplateExpression.
+         *
+         * @param node A TemplateExpression node.
+         */
         function shouldAddTemplateHead(node) {
+            // If this expression has an empty head literal and the first template span has a non-empty
+            // literal, then emitting the empty head literal is not necessary.
+            //     `${ foo } and ${ bar }`
+            // can be emitted as
+            //     foo + " and " + bar
+            // This is because it is only required that one of the first two operands in the emit
+            // output must be a string literal, so that the other operand and all following operands
+            // are forced into strings.
+            //
+            // If the first template span has an empty literal, then the head must still be emitted.
+            //     `${ foo }${ bar }`
+            // must still be emitted as
+            //     "" + foo + bar
+            // There is always atleast one templateSpan in this code path, since
+            // NoSubstitutionTemplateLiterals are directly emitted via emitLiteral()
             ts.Debug.assert(node.templateSpans.length !== 0);
             return node.head.text.length !== 0 || node.templateSpans[0].literal.text.length === 0;
         }
+        /**
+         * Adds the head of a TemplateExpression to an array of expressions.
+         *
+         * @param expressions An array of expressions.
+         * @param node A TemplateExpression node.
+         */
         function addTemplateHead(expressions, node) {
             if (!shouldAddTemplateHead(node)) {
                 return;
             }
             expressions.push(ts.createLiteral(node.head.text));
         }
+        /**
+         * Visits and adds the template spans of a TemplateExpression to an array of expressions.
+         *
+         * @param expressions An array of expressions.
+         * @param node A TemplateExpression node.
+         */
         function addTemplateSpans(expressions, node) {
             for (var _i = 0, _a = node.templateSpans; _i < _a.length; _i++) {
                 var span = _a[_i];
                 expressions.push(ts.visitNode(span.expression, visitor, ts.isExpression));
+                // Only emit if the literal is non-empty.
+                // The binary '+' operator is left-associative, so the first string concatenation
+                // with the head will force the result up to this point to be a string.
+                // Emitting a '+ ""' has no semantic effect for middles and tails.
                 if (span.literal.text.length !== 0) {
                     expressions.push(ts.createLiteral(span.literal.text));
                 }
             }
         }
+        /**
+         * Visits the `super` keyword
+         */
         function visitSuperKeyword(isExpressionOfCall) {
-            return hierarchyFacts & 8
+            return hierarchyFacts & 8 /* NonStaticClassElement */
                 && !isExpressionOfCall
                 ? ts.createPropertyAccess(ts.createFileLevelUniqueName("_super"), "prototype")
                 : ts.createFileLevelUniqueName("_super");
         }
         function visitMetaProperty(node) {
-            if (node.keywordToken === 94 && node.name.escapedText === "target") {
-                if (hierarchyFacts & 8192) {
-                    hierarchyFacts |= 32768;
+            if (node.keywordToken === 94 /* NewKeyword */ && node.name.escapedText === "target") {
+                if (hierarchyFacts & 8192 /* ComputedPropertyName */) {
+                    hierarchyFacts |= 32768 /* NewTargetInComputedPropertyName */;
                 }
                 else {
-                    hierarchyFacts |= 16384;
+                    hierarchyFacts |= 16384 /* NewTarget */;
                 }
                 return ts.createFileLevelUniqueName("_newTarget");
             }
             return node;
         }
+        /**
+         * Called by the printer just before a node is printed.
+         *
+         * @param hint A hint as to the intended usage of the node.
+         * @param node The node to be printed.
+         * @param emitCallback The callback used to emit the node.
+         */
         function onEmitNode(hint, node, emitCallback) {
-            if (enabledSubstitutions & 1 && ts.isFunctionLike(node)) {
-                var ancestorFacts = enterSubtree(16286, ts.getEmitFlags(node) & 8
-                    ? 65 | 16
-                    : 65);
+            if (enabledSubstitutions & 1 /* CapturedThis */ && ts.isFunctionLike(node)) {
+                // If we are tracking a captured `this`, keep track of the enclosing function.
+                var ancestorFacts = enterSubtree(16286 /* FunctionExcludes */, ts.getEmitFlags(node) & 8 /* CapturesThis */
+                    ? 65 /* FunctionIncludes */ | 16 /* CapturesThis */
+                    : 65 /* FunctionIncludes */);
                 previousOnEmitNode(hint, node, emitCallback);
-                exitSubtree(ancestorFacts, 0, 0);
+                exitSubtree(ancestorFacts, 0 /* None */, 0 /* None */);
                 return;
             }
             previousOnEmitNode(hint, node, emitCallback);
         }
+        /**
+         * Enables a more costly code path for substitutions when we determine a source file
+         * contains block-scoped bindings (e.g. `let` or `const`).
+         */
         function enableSubstitutionsForBlockScopedBindings() {
-            if ((enabledSubstitutions & 2) === 0) {
-                enabledSubstitutions |= 2;
-                context.enableSubstitution(71);
+            if ((enabledSubstitutions & 2 /* BlockScopedBindings */) === 0) {
+                enabledSubstitutions |= 2 /* BlockScopedBindings */;
+                context.enableSubstitution(71 /* Identifier */);
             }
         }
+        /**
+         * Enables a more costly code path for substitutions when we determine a source file
+         * contains a captured `this`.
+         */
         function enableSubstitutionsForCapturedThis() {
-            if ((enabledSubstitutions & 1) === 0) {
-                enabledSubstitutions |= 1;
-                context.enableSubstitution(99);
-                context.enableEmitNotification(155);
-                context.enableEmitNotification(154);
-                context.enableEmitNotification(156);
-                context.enableEmitNotification(157);
-                context.enableEmitNotification(193);
-                context.enableEmitNotification(192);
-                context.enableEmitNotification(234);
+            if ((enabledSubstitutions & 1 /* CapturedThis */) === 0) {
+                enabledSubstitutions |= 1 /* CapturedThis */;
+                context.enableSubstitution(99 /* ThisKeyword */);
+                context.enableEmitNotification(155 /* Constructor */);
+                context.enableEmitNotification(154 /* MethodDeclaration */);
+                context.enableEmitNotification(156 /* GetAccessor */);
+                context.enableEmitNotification(157 /* SetAccessor */);
+                context.enableEmitNotification(193 /* ArrowFunction */);
+                context.enableEmitNotification(192 /* FunctionExpression */);
+                context.enableEmitNotification(234 /* FunctionDeclaration */);
             }
         }
+        /**
+         * Hooks node substitutions.
+         *
+         * @param hint The context for the emitter.
+         * @param node The node to substitute.
+         */
         function onSubstituteNode(hint, node) {
             node = previousOnSubstituteNode(hint, node);
-            if (hint === 1) {
+            if (hint === 1 /* Expression */) {
                 return substituteExpression(node);
             }
             if (ts.isIdentifier(node)) {
@@ -53922,8 +68540,13 @@ var ts;
             }
             return node;
         }
+        /**
+         * Hooks substitutions for non-expression identifiers.
+         */
         function substituteIdentifier(node) {
-            if (enabledSubstitutions & 2 && !ts.isInternalName(node)) {
+            // Only substitute the identifier if we have enabled substitutions for block-scoped
+            // bindings.
+            if (enabledSubstitutions & 2 /* BlockScopedBindings */ && !ts.isInternalName(node)) {
                 var original = ts.getParseTreeNode(node, ts.isIdentifier);
                 if (original && isNameOfDeclarationWithCollidingName(original)) {
                     return ts.setTextRange(ts.getGeneratedNameForNode(original), node);
@@ -53931,28 +68554,44 @@ var ts;
             }
             return node;
         }
+        /**
+         * Determines whether a name is the name of a declaration with a colliding name.
+         * NOTE: This function expects to be called with an original source tree node.
+         *
+         * @param node An original source tree node.
+         */
         function isNameOfDeclarationWithCollidingName(node) {
             switch (node.parent.kind) {
-                case 182:
-                case 235:
-                case 238:
-                case 232:
+                case 182 /* BindingElement */:
+                case 235 /* ClassDeclaration */:
+                case 238 /* EnumDeclaration */:
+                case 232 /* VariableDeclaration */:
                     return node.parent.name === node
                         && resolver.isDeclarationWithCollidingName(node.parent);
             }
             return false;
         }
+        /**
+         * Substitutes an expression.
+         *
+         * @param node An Expression node.
+         */
         function substituteExpression(node) {
             switch (node.kind) {
-                case 71:
+                case 71 /* Identifier */:
                     return substituteExpressionIdentifier(node);
-                case 99:
+                case 99 /* ThisKeyword */:
                     return substituteThisKeyword(node);
             }
             return node;
         }
+        /**
+         * Substitutes an expression identifier.
+         *
+         * @param node An Identifier node.
+         */
         function substituteExpressionIdentifier(node) {
-            if (enabledSubstitutions & 2 && !ts.isInternalName(node)) {
+            if (enabledSubstitutions & 2 /* BlockScopedBindings */ && !ts.isInternalName(node)) {
                 var declaration = resolver.getReferencedDeclarationWithCollidingName(node);
                 if (declaration && !(ts.isClassLike(declaration) && isPartOfClassBody(declaration, node))) {
                     return ts.setTextRange(ts.getGeneratedNameForNode(ts.getNameOfDeclaration(declaration)), node);
@@ -53963,11 +68602,17 @@ var ts;
         function isPartOfClassBody(declaration, node) {
             var currentNode = ts.getParseTreeNode(node);
             if (!currentNode || currentNode === declaration || currentNode.end <= declaration.pos || currentNode.pos >= declaration.end) {
+                // if the node has no correlation to a parse tree node, its definitely not
+                // part of the body.
+                // if the node is outside of the document range of the declaration, its
+                // definitely not part of the body.
                 return false;
             }
             var blockScope = ts.getEnclosingBlockScopeContainer(declaration);
             while (currentNode) {
                 if (currentNode === blockScope || currentNode === declaration) {
+                    // if we are in the enclosing block scope of the declaration, we are definitely
+                    // not inside the class body.
                     return false;
                 }
                 if (ts.isClassElement(currentNode) && currentNode.parent === declaration) {
@@ -53977,15 +68622,20 @@ var ts;
             }
             return false;
         }
+        /**
+         * Substitutes `this` when contained within an arrow function.
+         *
+         * @param node The ThisKeyword node.
+         */
         function substituteThisKeyword(node) {
-            if (enabledSubstitutions & 1
-                && hierarchyFacts & 16) {
+            if (enabledSubstitutions & 1 /* CapturedThis */
+                && hierarchyFacts & 16 /* CapturesThis */) {
                 return ts.setTextRange(ts.createFileLevelUniqueName("_this"), node);
             }
             return node;
         }
         function getClassMemberPrefix(node, member) {
-            return ts.hasModifier(member, 32)
+            return ts.hasModifier(member, 32 /* Static */)
                 ? ts.getInternalName(node)
                 : ts.createPropertyAccess(ts.getInternalName(node), "prototype");
         }
@@ -53997,19 +68647,19 @@ var ts;
                 return false;
             }
             var statement = ts.firstOrUndefined(constructor.body.statements);
-            if (!statement || !ts.nodeIsSynthesized(statement) || statement.kind !== 216) {
+            if (!statement || !ts.nodeIsSynthesized(statement) || statement.kind !== 216 /* ExpressionStatement */) {
                 return false;
             }
             var statementExpression = statement.expression;
-            if (!ts.nodeIsSynthesized(statementExpression) || statementExpression.kind !== 187) {
+            if (!ts.nodeIsSynthesized(statementExpression) || statementExpression.kind !== 187 /* CallExpression */) {
                 return false;
             }
             var callTarget = statementExpression.expression;
-            if (!ts.nodeIsSynthesized(callTarget) || callTarget.kind !== 97) {
+            if (!ts.nodeIsSynthesized(callTarget) || callTarget.kind !== 97 /* SuperKeyword */) {
                 return false;
             }
             var callArgument = ts.singleOrUndefined(statementExpression.arguments);
-            if (!callArgument || !ts.nodeIsSynthesized(callArgument) || callArgument.kind !== 204) {
+            if (!callArgument || !ts.nodeIsSynthesized(callArgument) || callArgument.kind !== 204 /* SpreadElement */) {
                 return false;
             }
             var expression = callArgument.expression;
@@ -54019,14 +68669,16 @@ var ts;
     ts.transformES2015 = transformES2015;
     function createExtendsHelper(context, name) {
         context.requestEmitHelper(extendsHelper);
-        return ts.createCall(ts.getHelperName("__extends"), undefined, [
+        return ts.createCall(ts.getHelperName("__extends"), 
+        /*typeArguments*/ undefined, [
             name,
             ts.createFileLevelUniqueName("_super")
         ]);
     }
     function createTemplateObjectHelper(context, cooked, raw) {
         context.requestEmitHelper(templateObjectHelper);
-        return ts.createCall(ts.getHelperName("__makeTemplateObject"), undefined, [
+        return ts.createCall(ts.getHelperName("__makeTemplateObject"), 
+        /*typeArguments*/ undefined, [
             cooked,
             raw
         ]);
@@ -54044,39 +68696,64 @@ var ts;
         text: "\n            var __makeTemplateObject = (this && this.__makeTemplateObject) || function (cooked, raw) {\n                if (Object.defineProperty) { Object.defineProperty(cooked, \"raw\", { value: raw }); } else { cooked.raw = raw; }\n                return cooked;\n            };"
     };
 })(ts || (ts = {}));
+/*@internal*/
 var ts;
 (function (ts) {
+    /**
+     * Transforms ES5 syntax into ES3 syntax.
+     *
+     * @param context Context and state information for the transformation.
+     */
     function transformES5(context) {
         var compilerOptions = context.getCompilerOptions();
+        // enable emit notification only if using --jsx preserve or react-native
         var previousOnEmitNode;
         var noSubstitution;
-        if (compilerOptions.jsx === 1 || compilerOptions.jsx === 3) {
+        if (compilerOptions.jsx === 1 /* Preserve */ || compilerOptions.jsx === 3 /* ReactNative */) {
             previousOnEmitNode = context.onEmitNode;
             context.onEmitNode = onEmitNode;
-            context.enableEmitNotification(257);
-            context.enableEmitNotification(258);
-            context.enableEmitNotification(256);
+            context.enableEmitNotification(257 /* JsxOpeningElement */);
+            context.enableEmitNotification(258 /* JsxClosingElement */);
+            context.enableEmitNotification(256 /* JsxSelfClosingElement */);
             noSubstitution = [];
         }
         var previousOnSubstituteNode = context.onSubstituteNode;
         context.onSubstituteNode = onSubstituteNode;
-        context.enableSubstitution(185);
-        context.enableSubstitution(270);
+        context.enableSubstitution(185 /* PropertyAccessExpression */);
+        context.enableSubstitution(270 /* PropertyAssignment */);
         return ts.chainBundle(transformSourceFile);
+        /**
+         * Transforms an ES5 source file to ES3.
+         *
+         * @param node A SourceFile
+         */
         function transformSourceFile(node) {
             return node;
         }
+        /**
+         * Called by the printer just before a node is printed.
+         *
+         * @param hint A hint as to the intended usage of the node.
+         * @param node The node to emit.
+         * @param emitCallback A callback used to emit the node.
+         */
         function onEmitNode(hint, node, emitCallback) {
             switch (node.kind) {
-                case 257:
-                case 258:
-                case 256:
+                case 257 /* JsxOpeningElement */:
+                case 258 /* JsxClosingElement */:
+                case 256 /* JsxSelfClosingElement */:
                     var tagName = node.tagName;
                     noSubstitution[ts.getOriginalNodeId(tagName)] = true;
                     break;
             }
             previousOnEmitNode(hint, node, emitCallback);
         }
+        /**
+         * Hooks node substitutions.
+         *
+         * @param hint A hint as to the intended usage of the node.
+         * @param node The node to substitute.
+         */
         function onSubstituteNode(hint, node) {
             if (node.id && noSubstitution && noSubstitution[node.id]) {
                 return previousOnSubstituteNode(hint, node);
@@ -54090,6 +68767,11 @@ var ts;
             }
             return node;
         }
+        /**
+         * Substitutes a PropertyAccessExpression whose name is a reserved word.
+         *
+         * @param node A PropertyAccessExpression
+         */
         function substitutePropertyAccessExpression(node) {
             var literalName = trySubstituteReservedName(node.name);
             if (literalName) {
@@ -54097,6 +68779,11 @@ var ts;
             }
             return node;
         }
+        /**
+         * Substitutes a PropertyAssignment whose name is a reserved word.
+         *
+         * @param node A PropertyAssignment
+         */
         function substitutePropertyAssignment(node) {
             var literalName = ts.isIdentifier(node.name) && trySubstituteReservedName(node.name);
             if (literalName) {
@@ -54104,9 +68791,14 @@ var ts;
             }
             return node;
         }
+        /**
+         * If an identifier name is a reserved word, returns a string literal for the name.
+         *
+         * @param name An Identifier
+         */
         function trySubstituteReservedName(name) {
             var token = name.originalKeywordKind || (ts.nodeIsSynthesized(name) ? ts.stringToToken(ts.idText(name)) : undefined);
-            if (token !== undefined && token >= 72 && token <= 107) {
+            if (token !== undefined && token >= 72 /* FirstReservedWord */ && token <= 107 /* LastReservedWord */) {
                 return ts.setTextRange(ts.createLiteral(name), name);
             }
             return undefined;
@@ -54114,16 +68806,184 @@ var ts;
     }
     ts.transformES5 = transformES5;
 })(ts || (ts = {}));
+// Transforms generator functions into a compatible ES5 representation with similar runtime
+// semantics. This is accomplished by first transforming the body of each generator
+// function into an intermediate representation that is the compiled into a JavaScript
+// switch statement.
+//
+// Many functions in this transformer will contain comments indicating the expected
+// intermediate representation. For illustrative purposes, the following intermediate
+// language is used to define this intermediate representation:
+//
+//  .nop                            - Performs no operation.
+//  .local NAME, ...                - Define local variable declarations.
+//  .mark LABEL                     - Mark the location of a label.
+//  .br LABEL                       - Jump to a label. If jumping out of a protected
+//                                    region, all .finally blocks are executed.
+//  .brtrue LABEL, (x)              - Jump to a label IIF the expression `x` is truthy.
+//                                    If jumping out of a protected region, all .finally
+//                                    blocks are executed.
+//  .brfalse LABEL, (x)             - Jump to a label IIF the expression `x` is falsey.
+//                                    If jumping out of a protected region, all .finally
+//                                    blocks are executed.
+//  .yield (x)                      - Yield the value of the optional expression `x`.
+//                                    Resume at the next label.
+//  .yieldstar (x)                  - Delegate yield to the value of the optional
+//                                    expression `x`. Resume at the next label.
+//                                    NOTE: `x` must be an Iterator, not an Iterable.
+//  .loop CONTINUE, BREAK           - Marks the beginning of a loop. Any "continue" or
+//                                    "break" abrupt completions jump to the CONTINUE or
+//                                    BREAK labels, respectively.
+//  .endloop                        - Marks the end of a loop.
+//  .with (x)                       - Marks the beginning of a WithStatement block, using
+//                                    the supplied expression.
+//  .endwith                        - Marks the end of a WithStatement.
+//  .switch                         - Marks the beginning of a SwitchStatement.
+//  .endswitch                      - Marks the end of a SwitchStatement.
+//  .labeled NAME                   - Marks the beginning of a LabeledStatement with the
+//                                    supplied name.
+//  .endlabeled                     - Marks the end of a LabeledStatement.
+//  .try TRY, CATCH, FINALLY, END   - Marks the beginning of a protected region, and the
+//                                    labels for each block.
+//  .catch (x)                      - Marks the beginning of a catch block.
+//  .finally                        - Marks the beginning of a finally block.
+//  .endfinally                     - Marks the end of a finally block.
+//  .endtry                         - Marks the end of a protected region.
+//  .throw (x)                      - Throws the value of the expression `x`.
+//  .return (x)                     - Returns the value of the expression `x`.
+//
+// In addition, the illustrative intermediate representation introduces some special
+// variables:
+//
+//  %sent%                          - Either returns the next value sent to the generator,
+//                                    returns the result of a delegated yield, or throws
+//                                    the exception sent to the generator.
+//  %error%                         - Returns the value of the current exception in a
+//                                    catch block.
+//
+// This intermediate representation is then compiled into JavaScript syntax. The resulting
+// compilation output looks something like the following:
+//
+//  function f() {
+//      var /*locals*/;
+//      /*functions*/
+//      return __generator(function (state) {
+//          switch (state.label) {
+//              /*cases per label*/
+//          }
+//      });
+//  }
+//
+// Each of the above instructions corresponds to JavaScript emit similar to the following:
+//
+//  .local NAME                   | var NAME;
+// -------------------------------|----------------------------------------------
+//  .mark LABEL                   | case LABEL:
+// -------------------------------|----------------------------------------------
+//  .br LABEL                     |     return [3 /*break*/, LABEL];
+// -------------------------------|----------------------------------------------
+//  .brtrue LABEL, (x)            |     if (x) return [3 /*break*/, LABEL];
+// -------------------------------|----------------------------------------------
+//  .brfalse LABEL, (x)           |     if (!(x)) return [3, /*break*/, LABEL];
+// -------------------------------|----------------------------------------------
+//  .yield (x)                    |     return [4 /*yield*/, x];
+//  .mark RESUME                  | case RESUME:
+//      a = %sent%;               |     a = state.sent();
+// -------------------------------|----------------------------------------------
+//  .yieldstar (x)                |     return [5 /*yield**/, x];
+//  .mark RESUME                  | case RESUME:
+//      a = %sent%;               |     a = state.sent();
+// -------------------------------|----------------------------------------------
+//  .with (_a)                    |     with (_a) {
+//      a();                      |         a();
+//                                |     }
+//                                |     state.label = LABEL;
+//  .mark LABEL                   | case LABEL:
+//                                |     with (_a) {
+//      b();                      |         b();
+//                                |     }
+//  .endwith                      |
+// -------------------------------|----------------------------------------------
+//                                | case 0:
+//                                |     state.trys = [];
+//                                | ...
+//  .try TRY, CATCH, FINALLY, END |
+//  .mark TRY                     | case TRY:
+//                                |     state.trys.push([TRY, CATCH, FINALLY, END]);
+//  .nop                          |
+//      a();                      |     a();
+//  .br END                       |     return [3 /*break*/, END];
+//  .catch (e)                    |
+//  .mark CATCH                   | case CATCH:
+//                                |     e = state.sent();
+//      b();                      |     b();
+//  .br END                       |     return [3 /*break*/, END];
+//  .finally                      |
+//  .mark FINALLY                 | case FINALLY:
+//      c();                      |     c();
+//  .endfinally                   |     return [7 /*endfinally*/];
+//  .endtry                       |
+//  .mark END                     | case END:
+/*@internal*/
 var ts;
 (function (ts) {
+    var OpCode;
+    (function (OpCode) {
+        OpCode[OpCode["Nop"] = 0] = "Nop";
+        OpCode[OpCode["Statement"] = 1] = "Statement";
+        OpCode[OpCode["Assign"] = 2] = "Assign";
+        OpCode[OpCode["Break"] = 3] = "Break";
+        OpCode[OpCode["BreakWhenTrue"] = 4] = "BreakWhenTrue";
+        OpCode[OpCode["BreakWhenFalse"] = 5] = "BreakWhenFalse";
+        OpCode[OpCode["Yield"] = 6] = "Yield";
+        OpCode[OpCode["YieldStar"] = 7] = "YieldStar";
+        OpCode[OpCode["Return"] = 8] = "Return";
+        OpCode[OpCode["Throw"] = 9] = "Throw";
+        OpCode[OpCode["Endfinally"] = 10] = "Endfinally"; // Marks the end of a `finally` block
+    })(OpCode || (OpCode = {}));
+    // whether a generated code block is opening or closing at the current operation for a FunctionBuilder
+    var BlockAction;
+    (function (BlockAction) {
+        BlockAction[BlockAction["Open"] = 0] = "Open";
+        BlockAction[BlockAction["Close"] = 1] = "Close";
+    })(BlockAction || (BlockAction = {}));
+    // the kind for a generated code block in a FunctionBuilder
+    var CodeBlockKind;
+    (function (CodeBlockKind) {
+        CodeBlockKind[CodeBlockKind["Exception"] = 0] = "Exception";
+        CodeBlockKind[CodeBlockKind["With"] = 1] = "With";
+        CodeBlockKind[CodeBlockKind["Switch"] = 2] = "Switch";
+        CodeBlockKind[CodeBlockKind["Loop"] = 3] = "Loop";
+        CodeBlockKind[CodeBlockKind["Labeled"] = 4] = "Labeled";
+    })(CodeBlockKind || (CodeBlockKind = {}));
+    // the state for a generated code exception block
+    var ExceptionBlockState;
+    (function (ExceptionBlockState) {
+        ExceptionBlockState[ExceptionBlockState["Try"] = 0] = "Try";
+        ExceptionBlockState[ExceptionBlockState["Catch"] = 1] = "Catch";
+        ExceptionBlockState[ExceptionBlockState["Finally"] = 2] = "Finally";
+        ExceptionBlockState[ExceptionBlockState["Done"] = 3] = "Done";
+    })(ExceptionBlockState || (ExceptionBlockState = {}));
+    // NOTE: changes to this enum should be reflected in the __generator helper.
+    var Instruction;
+    (function (Instruction) {
+        Instruction[Instruction["Next"] = 0] = "Next";
+        Instruction[Instruction["Throw"] = 1] = "Throw";
+        Instruction[Instruction["Return"] = 2] = "Return";
+        Instruction[Instruction["Break"] = 3] = "Break";
+        Instruction[Instruction["Yield"] = 4] = "Yield";
+        Instruction[Instruction["YieldStar"] = 5] = "YieldStar";
+        Instruction[Instruction["Catch"] = 6] = "Catch";
+        Instruction[Instruction["Endfinally"] = 7] = "Endfinally";
+    })(Instruction || (Instruction = {}));
     function getInstructionName(instruction) {
         switch (instruction) {
-            case 2: return "return";
-            case 3: return "break";
-            case 4: return "yield";
-            case 5: return "yield*";
-            case 7: return "endfinally";
-            default: return undefined;
+            case 2 /* Return */: return "return";
+            case 3 /* Break */: return "break";
+            case 4 /* Yield */: return "yield";
+            case 5 /* YieldStar */: return "yield*";
+            case 7 /* Endfinally */: return "endfinally";
+            default: return undefined; // TODO: GH#18217
         }
     }
     function transformGenerators(context) {
@@ -54137,36 +68997,57 @@ var ts;
         var renamedCatchVariableDeclarations;
         var inGeneratorFunctionBody;
         var inStatementContainingYield;
-        var blocks;
-        var blockOffsets;
-        var blockActions;
-        var blockStack;
-        var labelOffsets;
-        var labelExpressions;
-        var nextLabelId = 1;
-        var operations;
-        var operationArguments;
-        var operationLocations;
-        var state;
-        var blockIndex = 0;
-        var labelNumber = 0;
+        // The following three arrays store information about generated code blocks.
+        // All three arrays are correlated by their index. This approach is used over allocating
+        // objects to store the same information to avoid GC overhead.
+        //
+        var blocks; // Information about the code block
+        var blockOffsets; // The operation offset at which a code block begins or ends
+        var blockActions; // Whether the code block is opened or closed
+        var blockStack; // A stack of currently open code blocks
+        // Labels are used to mark locations in the code that can be the target of a Break (jump)
+        // operation. These are translated into case clauses in a switch statement.
+        // The following two arrays are correlated by their index. This approach is used over
+        // allocating objects to store the same information to avoid GC overhead.
+        //
+        var labelOffsets; // The operation offset at which the label is defined.
+        var labelExpressions; // The NumericLiteral nodes bound to each label.
+        var nextLabelId = 1; // The next label id to use.
+        // Operations store information about generated code for the function body. This
+        // Includes things like statements, assignments, breaks (jumps), and yields.
+        // The following three arrays are correlated by their index. This approach is used over
+        // allocating objects to store the same information to avoid GC overhead.
+        //
+        var operations; // The operation to perform.
+        var operationArguments; // The arguments to the operation.
+        var operationLocations; // The source map location for the operation.
+        var state; // The name of the state object used by the generator at runtime.
+        // The following variables store information used by the `build` function:
+        //
+        var blockIndex = 0; // The index of the current block.
+        var labelNumber = 0; // The current label number.
         var labelNumbers;
-        var lastOperationWasAbrupt;
-        var lastOperationWasCompletion;
-        var clauses;
-        var statements;
-        var exceptionBlockStack;
-        var currentExceptionBlock;
-        var withBlockStack;
+        var lastOperationWasAbrupt; // Indicates whether the last operation was abrupt (break/continue).
+        var lastOperationWasCompletion; // Indicates whether the last operation was a completion (return/throw).
+        var clauses; // The case clauses generated for labels.
+        var statements; // The statements for the current label.
+        var exceptionBlockStack; // A stack of containing exception blocks.
+        var currentExceptionBlock; // The current exception block.
+        var withBlockStack; // A stack containing `with` blocks.
         return ts.chainBundle(transformSourceFile);
         function transformSourceFile(node) {
-            if (node.isDeclarationFile || (node.transformFlags & 512) === 0) {
+            if (node.isDeclarationFile || (node.transformFlags & 512 /* ContainsGenerator */) === 0) {
                 return node;
             }
             var visited = ts.visitEachChild(node, visitor, context);
             ts.addEmitHelpers(visited, context.readEmitHelpers());
             return visited;
         }
+        /**
+         * Visits a node.
+         *
+         * @param node The node to visit.
+         */
         function visitor(node) {
             var transformFlags = node.transformFlags;
             if (inStatementContainingYield) {
@@ -54175,56 +69056,66 @@ var ts;
             else if (inGeneratorFunctionBody) {
                 return visitJavaScriptInGeneratorFunctionBody(node);
             }
-            else if (transformFlags & 256) {
+            else if (transformFlags & 256 /* Generator */) {
                 return visitGenerator(node);
             }
-            else if (transformFlags & 512) {
+            else if (transformFlags & 512 /* ContainsGenerator */) {
                 return ts.visitEachChild(node, visitor, context);
             }
             else {
                 return node;
             }
         }
+        /**
+         * Visits a node that is contained within a statement that contains yield.
+         *
+         * @param node The node to visit.
+         */
         function visitJavaScriptInStatementContainingYield(node) {
             switch (node.kind) {
-                case 218:
+                case 218 /* DoStatement */:
                     return visitDoStatement(node);
-                case 219:
+                case 219 /* WhileStatement */:
                     return visitWhileStatement(node);
-                case 227:
+                case 227 /* SwitchStatement */:
                     return visitSwitchStatement(node);
-                case 228:
+                case 228 /* LabeledStatement */:
                     return visitLabeledStatement(node);
                 default:
                     return visitJavaScriptInGeneratorFunctionBody(node);
             }
         }
+        /**
+         * Visits a node that is contained within a generator function.
+         *
+         * @param node The node to visit.
+         */
         function visitJavaScriptInGeneratorFunctionBody(node) {
             switch (node.kind) {
-                case 234:
+                case 234 /* FunctionDeclaration */:
                     return visitFunctionDeclaration(node);
-                case 192:
+                case 192 /* FunctionExpression */:
                     return visitFunctionExpression(node);
-                case 156:
-                case 157:
+                case 156 /* GetAccessor */:
+                case 157 /* SetAccessor */:
                     return visitAccessorDeclaration(node);
-                case 214:
+                case 214 /* VariableStatement */:
                     return visitVariableStatement(node);
-                case 220:
+                case 220 /* ForStatement */:
                     return visitForStatement(node);
-                case 221:
+                case 221 /* ForInStatement */:
                     return visitForInStatement(node);
-                case 224:
+                case 224 /* BreakStatement */:
                     return visitBreakStatement(node);
-                case 223:
+                case 223 /* ContinueStatement */:
                     return visitContinueStatement(node);
-                case 225:
+                case 225 /* ReturnStatement */:
                     return visitReturnStatement(node);
                 default:
-                    if (node.transformFlags & 16777216) {
+                    if (node.transformFlags & 16777216 /* ContainsYield */) {
                         return visitJavaScriptContainingYield(node);
                     }
-                    else if (node.transformFlags & (512 | 33554432)) {
+                    else if (node.transformFlags & (512 /* ContainsGenerator */ | 33554432 /* ContainsHoistedDeclarationOrCompletion */)) {
                         return ts.visitEachChild(node, visitor, context);
                     }
                     else {
@@ -54232,41 +69123,66 @@ var ts;
                     }
             }
         }
+        /**
+         * Visits a node that contains a YieldExpression.
+         *
+         * @param node The node to visit.
+         */
         function visitJavaScriptContainingYield(node) {
             switch (node.kind) {
-                case 200:
+                case 200 /* BinaryExpression */:
                     return visitBinaryExpression(node);
-                case 201:
+                case 201 /* ConditionalExpression */:
                     return visitConditionalExpression(node);
-                case 203:
+                case 203 /* YieldExpression */:
                     return visitYieldExpression(node);
-                case 183:
+                case 183 /* ArrayLiteralExpression */:
                     return visitArrayLiteralExpression(node);
-                case 184:
+                case 184 /* ObjectLiteralExpression */:
                     return visitObjectLiteralExpression(node);
-                case 186:
+                case 186 /* ElementAccessExpression */:
                     return visitElementAccessExpression(node);
-                case 187:
+                case 187 /* CallExpression */:
                     return visitCallExpression(node);
-                case 188:
+                case 188 /* NewExpression */:
                     return visitNewExpression(node);
                 default:
                     return ts.visitEachChild(node, visitor, context);
             }
         }
+        /**
+         * Visits a generator function.
+         *
+         * @param node The node to visit.
+         */
         function visitGenerator(node) {
             switch (node.kind) {
-                case 234:
+                case 234 /* FunctionDeclaration */:
                     return visitFunctionDeclaration(node);
-                case 192:
+                case 192 /* FunctionExpression */:
                     return visitFunctionExpression(node);
                 default:
                     return ts.Debug.failBadSyntaxKind(node);
             }
         }
+        /**
+         * Visits a function declaration.
+         *
+         * This will be called when one of the following conditions are met:
+         * - The function declaration is a generator function.
+         * - The function declaration is contained within the body of a generator function.
+         *
+         * @param node The node to visit.
+         */
         function visitFunctionDeclaration(node) {
+            // Currently, we only support generators that were originally async functions.
             if (node.asteriskToken) {
-                node = ts.setOriginalNode(ts.setTextRange(ts.createFunctionDeclaration(undefined, node.modifiers, undefined, node.name, undefined, ts.visitParameterList(node.parameters, visitor, context), undefined, transformGeneratorFunctionBody(node.body)), node), node);
+                node = ts.setOriginalNode(ts.setTextRange(ts.createFunctionDeclaration(
+                /*decorators*/ undefined, node.modifiers, 
+                /*asteriskToken*/ undefined, node.name, 
+                /*typeParameters*/ undefined, ts.visitParameterList(node.parameters, visitor, context), 
+                /*type*/ undefined, transformGeneratorFunctionBody(node.body)), 
+                /*location*/ node), node);
             }
             else {
                 var savedInGeneratorFunctionBody = inGeneratorFunctionBody;
@@ -54278,6 +69194,8 @@ var ts;
                 inStatementContainingYield = savedInStatementContainingYield;
             }
             if (inGeneratorFunctionBody) {
+                // Function declarations in a generator function body are hoisted
+                // to the top of the lexical scope and elided from the current statement.
                 hoistFunctionDeclaration(node);
                 return undefined;
             }
@@ -54285,9 +69203,24 @@ var ts;
                 return node;
             }
         }
+        /**
+         * Visits a function expression.
+         *
+         * This will be called when one of the following conditions are met:
+         * - The function expression is a generator function.
+         * - The function expression is contained within the body of a generator function.
+         *
+         * @param node The node to visit.
+         */
         function visitFunctionExpression(node) {
+            // Currently, we only support generators that were originally async functions.
             if (node.asteriskToken) {
-                node = ts.setOriginalNode(ts.setTextRange(ts.createFunctionExpression(undefined, undefined, node.name, undefined, ts.visitParameterList(node.parameters, visitor, context), undefined, transformGeneratorFunctionBody(node.body)), node), node);
+                node = ts.setOriginalNode(ts.setTextRange(ts.createFunctionExpression(
+                /*modifiers*/ undefined, 
+                /*asteriskToken*/ undefined, node.name, 
+                /*typeParameters*/ undefined, ts.visitParameterList(node.parameters, visitor, context), 
+                /*type*/ undefined, transformGeneratorFunctionBody(node.body)), 
+                /*location*/ node), node);
             }
             else {
                 var savedInGeneratorFunctionBody = inGeneratorFunctionBody;
@@ -54300,6 +69233,14 @@ var ts;
             }
             return node;
         }
+        /**
+         * Visits a get or set accessor declaration.
+         *
+         * This will be called when one of the following conditions are met:
+         * - The accessor is contained within the body of a generator function.
+         *
+         * @param node The node to visit.
+         */
         function visitAccessorDeclaration(node) {
             var savedInGeneratorFunctionBody = inGeneratorFunctionBody;
             var savedInStatementContainingYield = inStatementContainingYield;
@@ -54310,7 +69251,13 @@ var ts;
             inStatementContainingYield = savedInStatementContainingYield;
             return node;
         }
+        /**
+         * Transforms the body of a generator function declaration.
+         *
+         * @param node The function body to transform.
+         */
         function transformGeneratorFunctionBody(body) {
+            // Save existing generator state
             var statements = [];
             var savedInGeneratorFunctionBody = inGeneratorFunctionBody;
             var savedInStatementContainingYield = inStatementContainingYield;
@@ -54325,6 +69272,7 @@ var ts;
             var savedOperationArguments = operationArguments;
             var savedOperationLocations = operationLocations;
             var savedState = state;
+            // Initialize generator state
             inGeneratorFunctionBody = true;
             inStatementContainingYield = false;
             blocks = undefined;
@@ -54337,13 +69285,15 @@ var ts;
             operations = undefined;
             operationArguments = undefined;
             operationLocations = undefined;
-            state = ts.createTempVariable(undefined);
+            state = ts.createTempVariable(/*recordTempVariable*/ undefined);
+            // Build the generator
             resumeLexicalEnvironment();
-            var statementOffset = ts.addPrologue(statements, body.statements, false, visitor);
+            var statementOffset = ts.addPrologue(statements, body.statements, /*ensureUseStrict*/ false, visitor);
             transformAndEmitStatements(body.statements, statementOffset);
             var buildResult = build();
             ts.prependStatements(statements, endLexicalEnvironment());
             statements.push(ts.createReturn(buildResult));
+            // Restore previous generator state
             inGeneratorFunctionBody = savedInGeneratorFunctionBody;
             inStatementContainingYield = savedInStatementContainingYield;
             blocks = savedBlocks;
@@ -54359,13 +69309,22 @@ var ts;
             state = savedState;
             return ts.setTextRange(ts.createBlock(statements, body.multiLine), body);
         }
+        /**
+         * Visits a variable statement.
+         *
+         * This will be called when one of the following conditions are met:
+         * - The variable statement is contained within the body of a generator function.
+         *
+         * @param node The node to visit.
+         */
         function visitVariableStatement(node) {
-            if (node.transformFlags & 16777216) {
+            if (node.transformFlags & 16777216 /* ContainsYield */) {
                 transformAndEmitVariableDeclarationList(node.declarationList);
                 return undefined;
             }
             else {
-                if (ts.getEmitFlags(node) & 1048576) {
+                // Do not hoist custom prologues.
+                if (ts.getEmitFlags(node) & 1048576 /* CustomPrologue */) {
                     return node;
                 }
                 for (var _i = 0, _a = node.declarationList.declarations; _i < _a.length; _i++) {
@@ -54379,46 +69338,78 @@ var ts;
                 return ts.setSourceMapRange(ts.createStatement(ts.inlineExpressions(ts.map(variables, transformInitializedVariable))), node);
             }
         }
+        /**
+         * Visits a binary expression.
+         *
+         * This will be called when one of the following conditions are met:
+         * - The node contains a YieldExpression.
+         *
+         * @param node The node to visit.
+         */
         function visitBinaryExpression(node) {
             var assoc = ts.getExpressionAssociativity(node);
             switch (assoc) {
-                case 0:
+                case 0 /* Left */:
                     return visitLeftAssociativeBinaryExpression(node);
-                case 1:
+                case 1 /* Right */:
                     return visitRightAssociativeBinaryExpression(node);
                 default:
                     return ts.Debug.assertNever(assoc);
             }
         }
         function isCompoundAssignment(kind) {
-            return kind >= 59
-                && kind <= 70;
+            return kind >= 59 /* FirstCompoundAssignment */
+                && kind <= 70 /* LastCompoundAssignment */;
         }
         function getOperatorForCompoundAssignment(kind) {
             switch (kind) {
-                case 59: return 37;
-                case 60: return 38;
-                case 61: return 39;
-                case 62: return 40;
-                case 63: return 41;
-                case 64: return 42;
-                case 65: return 45;
-                case 66: return 46;
-                case 67: return 47;
-                case 68: return 48;
-                case 69: return 49;
-                case 70: return 50;
+                case 59 /* PlusEqualsToken */: return 37 /* PlusToken */;
+                case 60 /* MinusEqualsToken */: return 38 /* MinusToken */;
+                case 61 /* AsteriskEqualsToken */: return 39 /* AsteriskToken */;
+                case 62 /* AsteriskAsteriskEqualsToken */: return 40 /* AsteriskAsteriskToken */;
+                case 63 /* SlashEqualsToken */: return 41 /* SlashToken */;
+                case 64 /* PercentEqualsToken */: return 42 /* PercentToken */;
+                case 65 /* LessThanLessThanEqualsToken */: return 45 /* LessThanLessThanToken */;
+                case 66 /* GreaterThanGreaterThanEqualsToken */: return 46 /* GreaterThanGreaterThanToken */;
+                case 67 /* GreaterThanGreaterThanGreaterThanEqualsToken */: return 47 /* GreaterThanGreaterThanGreaterThanToken */;
+                case 68 /* AmpersandEqualsToken */: return 48 /* AmpersandToken */;
+                case 69 /* BarEqualsToken */: return 49 /* BarToken */;
+                case 70 /* CaretEqualsToken */: return 50 /* CaretToken */;
             }
         }
+        /**
+         * Visits a right-associative binary expression containing `yield`.
+         *
+         * @param node The node to visit.
+         */
         function visitRightAssociativeBinaryExpression(node) {
             var left = node.left, right = node.right;
             if (containsYield(right)) {
                 var target = void 0;
                 switch (left.kind) {
-                    case 185:
+                    case 185 /* PropertyAccessExpression */:
+                        // [source]
+                        //      a.b = yield;
+                        //
+                        // [intermediate]
+                        //  .local _a
+                        //      _a = a;
+                        //  .yield resumeLabel
+                        //  .mark resumeLabel
+                        //      _a.b = %sent%;
                         target = ts.updatePropertyAccess(left, cacheExpression(ts.visitNode(left.expression, visitor, ts.isLeftHandSideExpression)), left.name);
                         break;
-                    case 186:
+                    case 186 /* ElementAccessExpression */:
+                        // [source]
+                        //      a[b] = yield;
+                        //
+                        // [intermediate]
+                        //  .local _a, _b
+                        //      _a = a;
+                        //      _b = b;
+                        //  .yield resumeLabel
+                        //  .mark resumeLabel
+                        //      _a[_b] = %sent%;
                         target = ts.updateElementAccess(left, cacheExpression(ts.visitNode(left.expression, visitor, ts.isLeftHandSideExpression)), cacheExpression(ts.visitNode(left.argumentExpression, visitor, ts.isExpression)));
                         break;
                     default:
@@ -54440,9 +69431,17 @@ var ts;
                 if (ts.isLogicalOperator(node.operatorToken.kind)) {
                     return visitLogicalBinaryExpression(node);
                 }
-                else if (node.operatorToken.kind === 26) {
+                else if (node.operatorToken.kind === 26 /* CommaToken */) {
                     return visitCommaExpression(node);
                 }
+                // [source]
+                //      a() + (yield) + c()
+                //
+                // [intermediate]
+                //  .local _a
+                //      _a = a();
+                //  .yield resumeLabel
+                //      _a + %sent% + c()
                 var clone_4 = ts.getMutableClone(node);
                 clone_4.left = cacheExpression(ts.visitNode(node.left, visitor, ts.isExpression));
                 clone_4.right = ts.visitNode(node.right, visitor, ts.isExpression);
@@ -54450,73 +69449,176 @@ var ts;
             }
             return ts.visitEachChild(node, visitor, context);
         }
+        /**
+         * Visits a logical binary expression containing `yield`.
+         *
+         * @param node A node to visit.
+         */
         function visitLogicalBinaryExpression(node) {
+            // Logical binary expressions (`&&` and `||`) are shortcutting expressions and need
+            // to be transformed as such:
+            //
+            // [source]
+            //      x = a() && yield;
+            //
+            // [intermediate]
+            //  .local _a
+            //      _a = a();
+            //  .brfalse resultLabel, (_a)
+            //  .yield resumeLabel
+            //  .mark resumeLabel
+            //      _a = %sent%;
+            //  .mark resultLabel
+            //      x = _a;
+            //
+            // [source]
+            //      x = a() || yield;
+            //
+            // [intermediate]
+            //  .local _a
+            //      _a = a();
+            //  .brtrue resultLabel, (_a)
+            //  .yield resumeLabel
+            //  .mark resumeLabel
+            //      _a = %sent%;
+            //  .mark resultLabel
+            //      x = _a;
             var resultLabel = defineLabel();
             var resultLocal = declareLocal();
-            emitAssignment(resultLocal, ts.visitNode(node.left, visitor, ts.isExpression), node.left);
-            if (node.operatorToken.kind === 53) {
-                emitBreakWhenFalse(resultLabel, resultLocal, node.left);
+            emitAssignment(resultLocal, ts.visitNode(node.left, visitor, ts.isExpression), /*location*/ node.left);
+            if (node.operatorToken.kind === 53 /* AmpersandAmpersandToken */) {
+                // Logical `&&` shortcuts when the left-hand operand is falsey.
+                emitBreakWhenFalse(resultLabel, resultLocal, /*location*/ node.left);
             }
             else {
-                emitBreakWhenTrue(resultLabel, resultLocal, node.left);
+                // Logical `||` shortcuts when the left-hand operand is truthy.
+                emitBreakWhenTrue(resultLabel, resultLocal, /*location*/ node.left);
             }
-            emitAssignment(resultLocal, ts.visitNode(node.right, visitor, ts.isExpression), node.right);
+            emitAssignment(resultLocal, ts.visitNode(node.right, visitor, ts.isExpression), /*location*/ node.right);
             markLabel(resultLabel);
             return resultLocal;
         }
+        /**
+         * Visits a comma expression containing `yield`.
+         *
+         * @param node The node to visit.
+         */
         function visitCommaExpression(node) {
+            // [source]
+            //      x = a(), yield, b();
+            //
+            // [intermediate]
+            //      a();
+            //  .yield resumeLabel
+            //  .mark resumeLabel
+            //      x = %sent%, b();
             var pendingExpressions = [];
             visit(node.left);
             visit(node.right);
             return ts.inlineExpressions(pendingExpressions);
             function visit(node) {
-                if (ts.isBinaryExpression(node) && node.operatorToken.kind === 26) {
+                if (ts.isBinaryExpression(node) && node.operatorToken.kind === 26 /* CommaToken */) {
                     visit(node.left);
                     visit(node.right);
                 }
                 else {
                     if (containsYield(node) && pendingExpressions.length > 0) {
-                        emitWorker(1, [ts.createStatement(ts.inlineExpressions(pendingExpressions))]);
+                        emitWorker(1 /* Statement */, [ts.createStatement(ts.inlineExpressions(pendingExpressions))]);
                         pendingExpressions = [];
                     }
                     pendingExpressions.push(ts.visitNode(node, visitor, ts.isExpression));
                 }
             }
         }
+        /**
+         * Visits a conditional expression containing `yield`.
+         *
+         * @param node The node to visit.
+         */
         function visitConditionalExpression(node) {
+            // [source]
+            //      x = a() ? yield : b();
+            //
+            // [intermediate]
+            //  .local _a
+            //  .brfalse whenFalseLabel, (a())
+            //  .yield resumeLabel
+            //  .mark resumeLabel
+            //      _a = %sent%;
+            //  .br resultLabel
+            //  .mark whenFalseLabel
+            //      _a = b();
+            //  .mark resultLabel
+            //      x = _a;
+            // We only need to perform a specific transformation if a `yield` expression exists
+            // in either the `whenTrue` or `whenFalse` branches.
+            // A `yield` in the condition will be handled by the normal visitor.
             if (containsYield(node.whenTrue) || containsYield(node.whenFalse)) {
                 var whenFalseLabel = defineLabel();
                 var resultLabel = defineLabel();
                 var resultLocal = declareLocal();
-                emitBreakWhenFalse(whenFalseLabel, ts.visitNode(node.condition, visitor, ts.isExpression), node.condition);
-                emitAssignment(resultLocal, ts.visitNode(node.whenTrue, visitor, ts.isExpression), node.whenTrue);
+                emitBreakWhenFalse(whenFalseLabel, ts.visitNode(node.condition, visitor, ts.isExpression), /*location*/ node.condition);
+                emitAssignment(resultLocal, ts.visitNode(node.whenTrue, visitor, ts.isExpression), /*location*/ node.whenTrue);
                 emitBreak(resultLabel);
                 markLabel(whenFalseLabel);
-                emitAssignment(resultLocal, ts.visitNode(node.whenFalse, visitor, ts.isExpression), node.whenFalse);
+                emitAssignment(resultLocal, ts.visitNode(node.whenFalse, visitor, ts.isExpression), /*location*/ node.whenFalse);
                 markLabel(resultLabel);
                 return resultLocal;
             }
             return ts.visitEachChild(node, visitor, context);
         }
+        /**
+         * Visits a `yield` expression.
+         *
+         * @param node The node to visit.
+         */
         function visitYieldExpression(node) {
+            // [source]
+            //      x = yield a();
+            //
+            // [intermediate]
+            //  .yield resumeLabel, (a())
+            //  .mark resumeLabel
+            //      x = %sent%;
             var resumeLabel = defineLabel();
             var expression = ts.visitNode(node.expression, visitor, ts.isExpression);
             if (node.asteriskToken) {
-                var iterator = (ts.getEmitFlags(node.expression) & 8388608) === 0
-                    ? ts.createValuesHelper(context, expression, node)
+                var iterator = (ts.getEmitFlags(node.expression) & 8388608 /* Iterator */) === 0
+                    ? ts.createValuesHelper(context, expression, /*location*/ node)
                     : expression;
-                emitYieldStar(iterator, node);
+                emitYieldStar(iterator, /*location*/ node);
             }
             else {
-                emitYield(expression, node);
+                emitYield(expression, /*location*/ node);
             }
             markLabel(resumeLabel);
-            return createGeneratorResume(node);
+            return createGeneratorResume(/*location*/ node);
         }
+        /**
+         * Visits an ArrayLiteralExpression that contains a YieldExpression.
+         *
+         * @param node The node to visit.
+         */
         function visitArrayLiteralExpression(node) {
-            return visitElements(node.elements, undefined, undefined, node.multiLine);
+            return visitElements(node.elements, /*leadingElement*/ undefined, /*location*/ undefined, node.multiLine);
         }
+        /**
+         * Visits an array of expressions containing one or more YieldExpression nodes
+         * and returns an expression for the resulting value.
+         *
+         * @param elements The elements to visit.
+         * @param multiLine Whether array literals created should be emitted on multiple lines.
+         */
         function visitElements(elements, leadingElement, location, multiLine) {
+            // [source]
+            //      ar = [1, yield, 2];
+            //
+            // [intermediate]
+            //  .local _a
+            //      _a = [1];
+            //  .yield resumeLabel
+            //  .mark resumeLabel
+            //      ar = _a.concat([%sent%, 2]);
             var numInitialElements = countInitialNodesWithoutYield(elements);
             var temp;
             if (numInitialElements > 0) {
@@ -54547,6 +69649,23 @@ var ts;
             }
         }
         function visitObjectLiteralExpression(node) {
+            // [source]
+            //      o = {
+            //          a: 1,
+            //          b: yield,
+            //          c: 2
+            //      };
+            //
+            // [intermediate]
+            //  .local _a
+            //      _a = {
+            //          a: 1
+            //      };
+            //  .yield resumeLabel
+            //  .mark resumeLabel
+            //      o = (_a.b = %sent%,
+            //          _a.c = 2,
+            //          _a);
             var properties = node.properties;
             var multiLine = node.multiLine;
             var numInitialProperties = countInitialNodesWithoutYield(properties);
@@ -54571,8 +69690,22 @@ var ts;
                 return expressions;
             }
         }
+        /**
+         * Visits an ElementAccessExpression that contains a YieldExpression.
+         *
+         * @param node The node to visit.
+         */
         function visitElementAccessExpression(node) {
             if (containsYield(node.argumentExpression)) {
+                // [source]
+                //      a = x[yield];
+                //
+                // [intermediate]
+                //  .local _a
+                //      _a = x;
+                //  .yield resumeLabel
+                //  .mark resumeLabel
+                //      a = _a[%sent%]
                 var clone_5 = ts.getMutableClone(node);
                 clone_5.expression = cacheExpression(ts.visitNode(node.expression, visitor, ts.isLeftHandSideExpression));
                 clone_5.argumentExpression = ts.visitNode(node.argumentExpression, visitor, ts.isExpression);
@@ -54582,15 +69715,38 @@ var ts;
         }
         function visitCallExpression(node) {
             if (!ts.isImportCall(node) && ts.forEach(node.arguments, containsYield)) {
-                var _a = ts.createCallBinding(node.expression, hoistVariableDeclaration, languageVersion, true), target = _a.target, thisArg = _a.thisArg;
-                return ts.setOriginalNode(ts.createFunctionApply(cacheExpression(ts.visitNode(target, visitor, ts.isLeftHandSideExpression)), thisArg, visitElements(node.arguments), node), node);
+                // [source]
+                //      a.b(1, yield, 2);
+                //
+                // [intermediate]
+                //  .local _a, _b, _c
+                //      _b = (_a = a).b;
+                //      _c = [1];
+                //  .yield resumeLabel
+                //  .mark resumeLabel
+                //      _b.apply(_a, _c.concat([%sent%, 2]));
+                var _a = ts.createCallBinding(node.expression, hoistVariableDeclaration, languageVersion, /*cacheIdentifiers*/ true), target = _a.target, thisArg = _a.thisArg;
+                return ts.setOriginalNode(ts.createFunctionApply(cacheExpression(ts.visitNode(target, visitor, ts.isLeftHandSideExpression)), thisArg, visitElements(node.arguments), 
+                /*location*/ node), node);
             }
             return ts.visitEachChild(node, visitor, context);
         }
         function visitNewExpression(node) {
             if (ts.forEach(node.arguments, containsYield)) {
+                // [source]
+                //      new a.b(1, yield, 2);
+                //
+                // [intermediate]
+                //  .local _a, _b, _c
+                //      _b = (_a = a.b).bind;
+                //      _c = [1];
+                //  .yield resumeLabel
+                //  .mark resumeLabel
+                //      new (_b.apply(_a, _c.concat([%sent%, 2])));
                 var _a = ts.createCallBinding(ts.createPropertyAccess(node.expression, "bind"), hoistVariableDeclaration), target = _a.target, thisArg = _a.thisArg;
-                return ts.setOriginalNode(ts.setTextRange(ts.createNew(ts.createFunctionApply(cacheExpression(ts.visitNode(target, visitor, ts.isExpression)), thisArg, visitElements(node.arguments, ts.createVoidZero())), undefined, []), node), node);
+                return ts.setOriginalNode(ts.setTextRange(ts.createNew(ts.createFunctionApply(cacheExpression(ts.visitNode(target, visitor, ts.isExpression)), thisArg, visitElements(node.arguments, 
+                /*leadingElement*/ ts.createVoidZero())), 
+                /*typeArguments*/ undefined, []), node), node);
             }
             return ts.visitEachChild(node, visitor, context);
         }
@@ -54619,35 +69775,35 @@ var ts;
         }
         function transformAndEmitStatementWorker(node) {
             switch (node.kind) {
-                case 213:
+                case 213 /* Block */:
                     return transformAndEmitBlock(node);
-                case 216:
+                case 216 /* ExpressionStatement */:
                     return transformAndEmitExpressionStatement(node);
-                case 217:
+                case 217 /* IfStatement */:
                     return transformAndEmitIfStatement(node);
-                case 218:
+                case 218 /* DoStatement */:
                     return transformAndEmitDoStatement(node);
-                case 219:
+                case 219 /* WhileStatement */:
                     return transformAndEmitWhileStatement(node);
-                case 220:
+                case 220 /* ForStatement */:
                     return transformAndEmitForStatement(node);
-                case 221:
+                case 221 /* ForInStatement */:
                     return transformAndEmitForInStatement(node);
-                case 223:
+                case 223 /* ContinueStatement */:
                     return transformAndEmitContinueStatement(node);
-                case 224:
+                case 224 /* BreakStatement */:
                     return transformAndEmitBreakStatement(node);
-                case 225:
+                case 225 /* ReturnStatement */:
                     return transformAndEmitReturnStatement(node);
-                case 226:
+                case 226 /* WithStatement */:
                     return transformAndEmitWithStatement(node);
-                case 227:
+                case 227 /* SwitchStatement */:
                     return transformAndEmitSwitchStatement(node);
-                case 228:
+                case 228 /* LabeledStatement */:
                     return transformAndEmitLabeledStatement(node);
-                case 229:
+                case 229 /* ThrowStatement */:
                     return transformAndEmitThrowStatement(node);
-                case 230:
+                case 230 /* TryStatement */:
                     return transformAndEmitTryStatement(node);
                 default:
                     return emitStatement(ts.visitNode(node, visitor, ts.isStatement));
@@ -54696,10 +69852,23 @@ var ts;
         }
         function transformAndEmitIfStatement(node) {
             if (containsYield(node)) {
+                // [source]
+                //      if (x)
+                //          /*thenStatement*/
+                //      else
+                //          /*elseStatement*/
+                //
+                // [intermediate]
+                //  .brfalse elseLabel, (x)
+                //      /*thenStatement*/
+                //  .br endLabel
+                //  .mark elseLabel
+                //      /*elseStatement*/
+                //  .mark endLabel
                 if (containsYield(node.thenStatement) || containsYield(node.elseStatement)) {
                     var endLabel = defineLabel();
                     var elseLabel = node.elseStatement ? defineLabel() : undefined;
-                    emitBreakWhenFalse(node.elseStatement ? elseLabel : endLabel, ts.visitNode(node.expression, visitor, ts.isExpression), node.expression);
+                    emitBreakWhenFalse(node.elseStatement ? elseLabel : endLabel, ts.visitNode(node.expression, visitor, ts.isExpression), /*location*/ node.expression);
                     transformAndEmitEmbeddedStatement(node.thenStatement);
                     if (node.elseStatement) {
                         emitBreak(endLabel);
@@ -54718,9 +69887,23 @@ var ts;
         }
         function transformAndEmitDoStatement(node) {
             if (containsYield(node)) {
+                // [source]
+                //      do {
+                //          /*body*/
+                //      }
+                //      while (i < 10);
+                //
+                // [intermediate]
+                //  .loop conditionLabel, endLabel
+                //  .mark loopLabel
+                //      /*body*/
+                //  .mark conditionLabel
+                //  .brtrue loopLabel, (i < 10)
+                //  .endloop
+                //  .mark endLabel
                 var conditionLabel = defineLabel();
                 var loopLabel = defineLabel();
-                beginLoopBlock(conditionLabel);
+                beginLoopBlock(/*continueLabel*/ conditionLabel);
                 markLabel(loopLabel);
                 transformAndEmitEmbeddedStatement(node.statement);
                 markLabel(conditionLabel);
@@ -54744,6 +69927,19 @@ var ts;
         }
         function transformAndEmitWhileStatement(node) {
             if (containsYield(node)) {
+                // [source]
+                //      while (i < 10) {
+                //          /*body*/
+                //      }
+                //
+                // [intermediate]
+                //  .loop loopLabel, endLabel
+                //  .mark loopLabel
+                //  .brfalse endLabel, (i < 10)
+                //      /*body*/
+                //  .br loopLabel
+                //  .endloop
+                //  .mark endLabel
                 var loopLabel = defineLabel();
                 var endLabel = beginLoopBlock(loopLabel);
                 markLabel(loopLabel);
@@ -54769,6 +69965,23 @@ var ts;
         }
         function transformAndEmitForStatement(node) {
             if (containsYield(node)) {
+                // [source]
+                //      for (var i = 0; i < 10; i++) {
+                //          /*body*/
+                //      }
+                //
+                // [intermediate]
+                //  .local i
+                //      i = 0;
+                //  .loop incrementLabel, endLoopLabel
+                //  .mark conditionLabel
+                //  .brfalse endLoopLabel, (i < 10)
+                //      /*body*/
+                //  .mark incrementLabel
+                //      i++;
+                //  .br conditionLabel
+                //  .endloop
+                //  .mark endLoopLabel
                 var conditionLabel = defineLabel();
                 var incrementLabel = defineLabel();
                 var endLabel = beginLoopBlock(incrementLabel);
@@ -54821,14 +70034,36 @@ var ts;
             return node;
         }
         function transformAndEmitForInStatement(node) {
+            // TODO(rbuckton): Source map locations
             if (containsYield(node)) {
-                var keysArray = declareLocal();
-                var key = declareLocal();
-                var keysIndex = ts.createLoopVariable();
+                // [source]
+                //      for (var p in o) {
+                //          /*body*/
+                //      }
+                //
+                // [intermediate]
+                //  .local _a, _b, _i
+                //      _a = [];
+                //      for (_b in o) _a.push(_b);
+                //      _i = 0;
+                //  .loop incrementLabel, endLoopLabel
+                //  .mark conditionLabel
+                //  .brfalse endLoopLabel, (_i < _a.length)
+                //      p = _a[_i];
+                //      /*body*/
+                //  .mark incrementLabel
+                //      _b++;
+                //  .br conditionLabel
+                //  .endloop
+                //  .mark endLoopLabel
+                var keysArray = declareLocal(); // _a
+                var key = declareLocal(); // _b
+                var keysIndex = ts.createLoopVariable(); // _i
                 var initializer = node.initializer;
                 hoistVariableDeclaration(keysIndex);
                 emitAssignment(keysArray, ts.createArrayLiteral());
-                emitStatement(ts.createForIn(key, ts.visitNode(node.expression, visitor, ts.isExpression), ts.createStatement(ts.createCall(ts.createPropertyAccess(keysArray, "push"), undefined, [key]))));
+                emitStatement(ts.createForIn(key, ts.visitNode(node.expression, visitor, ts.isExpression), ts.createStatement(ts.createCall(ts.createPropertyAccess(keysArray, "push"), 
+                /*typeArguments*/ undefined, [key]))));
                 emitAssignment(keysIndex, ts.createLiteral(0));
                 var conditionLabel = defineLabel();
                 var incrementLabel = defineLabel();
@@ -54859,6 +70094,18 @@ var ts;
             }
         }
         function visitForInStatement(node) {
+            // [source]
+            //      for (var x in a) {
+            //          /*body*/
+            //      }
+            //
+            // [intermediate]
+            //  .local x
+            //  .loop
+            //      for (x in a) {
+            //          /*body*/
+            //      }
+            //  .endloop
             if (inStatementContainingYield) {
                 beginScriptLoopBlock();
             }
@@ -54881,9 +70128,10 @@ var ts;
         function transformAndEmitContinueStatement(node) {
             var label = findContinueTarget(node.label ? ts.idText(node.label) : undefined);
             if (label > 0) {
-                emitBreak(label, node);
+                emitBreak(label, /*location*/ node);
             }
             else {
+                // invalid continue without a containing loop. Leave the node as is, per #17875.
                 emitStatement(node);
             }
         }
@@ -54891,7 +70139,7 @@ var ts;
             if (inStatementContainingYield) {
                 var label = findContinueTarget(node.label && ts.idText(node.label));
                 if (label > 0) {
-                    return createInlineBreak(label, node);
+                    return createInlineBreak(label, /*location*/ node);
                 }
             }
             return ts.visitEachChild(node, visitor, context);
@@ -54899,9 +70147,10 @@ var ts;
         function transformAndEmitBreakStatement(node) {
             var label = findBreakTarget(node.label ? ts.idText(node.label) : undefined);
             if (label > 0) {
-                emitBreak(label, node);
+                emitBreak(label, /*location*/ node);
             }
             else {
+                // invalid break without a containing loop, switch, or labeled statement. Leave the node as is, per #17875.
                 emitStatement(node);
             }
         }
@@ -54909,19 +70158,30 @@ var ts;
             if (inStatementContainingYield) {
                 var label = findBreakTarget(node.label && ts.idText(node.label));
                 if (label > 0) {
-                    return createInlineBreak(label, node);
+                    return createInlineBreak(label, /*location*/ node);
                 }
             }
             return ts.visitEachChild(node, visitor, context);
         }
         function transformAndEmitReturnStatement(node) {
-            emitReturn(ts.visitNode(node.expression, visitor, ts.isExpression), node);
+            emitReturn(ts.visitNode(node.expression, visitor, ts.isExpression), 
+            /*location*/ node);
         }
         function visitReturnStatement(node) {
-            return createInlineReturn(ts.visitNode(node.expression, visitor, ts.isExpression), node);
+            return createInlineReturn(ts.visitNode(node.expression, visitor, ts.isExpression), 
+            /*location*/ node);
         }
         function transformAndEmitWithStatement(node) {
             if (containsYield(node)) {
+                // [source]
+                //      with (x) {
+                //          /*body*/
+                //      }
+                //
+                // [intermediate]
+                //  .with (x)
+                //      /*body*/
+                //  .endwith
                 beginWithBlock(cacheExpression(ts.visitNode(node.expression, visitor, ts.isExpression)));
                 transformAndEmitEmbeddedStatement(node.statement);
                 endWithBlock();
@@ -54932,31 +70192,66 @@ var ts;
         }
         function transformAndEmitSwitchStatement(node) {
             if (containsYield(node.caseBlock)) {
+                // [source]
+                //      switch (x) {
+                //          case a:
+                //              /*caseStatements*/
+                //          case b:
+                //              /*caseStatements*/
+                //          default:
+                //              /*defaultStatements*/
+                //      }
+                //
+                // [intermediate]
+                //  .local _a
+                //  .switch endLabel
+                //      _a = x;
+                //      switch (_a) {
+                //          case a:
+                //  .br clauseLabels[0]
+                //      }
+                //      switch (_a) {
+                //          case b:
+                //  .br clauseLabels[1]
+                //      }
+                //  .br clauseLabels[2]
+                //  .mark clauseLabels[0]
+                //      /*caseStatements*/
+                //  .mark clauseLabels[1]
+                //      /*caseStatements*/
+                //  .mark clauseLabels[2]
+                //      /*caseStatements*/
+                //  .endswitch
+                //  .mark endLabel
                 var caseBlock = node.caseBlock;
                 var numClauses = caseBlock.clauses.length;
                 var endLabel = beginSwitchBlock();
                 var expression = cacheExpression(ts.visitNode(node.expression, visitor, ts.isExpression));
+                // Create labels for each clause and find the index of the first default clause.
                 var clauseLabels = [];
                 var defaultClauseIndex = -1;
                 for (var i = 0; i < numClauses; i++) {
                     var clause = caseBlock.clauses[i];
                     clauseLabels.push(defineLabel());
-                    if (clause.kind === 267 && defaultClauseIndex === -1) {
+                    if (clause.kind === 267 /* DefaultClause */ && defaultClauseIndex === -1) {
                         defaultClauseIndex = i;
                     }
                 }
+                // Emit switch statements for each run of case clauses either from the first case
+                // clause or the next case clause with a `yield` in its expression, up to the next
+                // case clause with a `yield` in its expression.
                 var clausesWritten = 0;
                 var pendingClauses = [];
                 while (clausesWritten < numClauses) {
                     var defaultClausesSkipped = 0;
                     for (var i = clausesWritten; i < numClauses; i++) {
                         var clause = caseBlock.clauses[i];
-                        if (clause.kind === 266) {
+                        if (clause.kind === 266 /* CaseClause */) {
                             if (containsYield(clause.expression) && pendingClauses.length > 0) {
                                 break;
                             }
                             pendingClauses.push(ts.createCaseClause(ts.visitNode(clause.expression, visitor, ts.isExpression), [
-                                createInlineBreak(clauseLabels[i], clause.expression)
+                                createInlineBreak(clauseLabels[i], /*location*/ clause.expression)
                             ]));
                         }
                         else {
@@ -55001,6 +70296,16 @@ var ts;
         }
         function transformAndEmitLabeledStatement(node) {
             if (containsYield(node)) {
+                // [source]
+                //      x: {
+                //          /*body*/
+                //      }
+                //
+                // [intermediate]
+                //  .labeled "x", endLabel
+                //      /*body*/
+                //  .endlabeled
+                //  .mark endLabel
                 beginLabeledBlock(ts.idText(node.label));
                 transformAndEmitEmbeddedStatement(node.statement);
                 endLabeledBlock();
@@ -55020,14 +70325,44 @@ var ts;
             return node;
         }
         function transformAndEmitThrowStatement(node) {
-            emitThrow(ts.visitNode(node.expression, visitor, ts.isExpression), node);
+            emitThrow(ts.visitNode(node.expression, visitor, ts.isExpression), 
+            /*location*/ node);
         }
         function transformAndEmitTryStatement(node) {
             if (containsYield(node)) {
+                // [source]
+                //      try {
+                //          /*tryBlock*/
+                //      }
+                //      catch (e) {
+                //          /*catchBlock*/
+                //      }
+                //      finally {
+                //          /*finallyBlock*/
+                //      }
+                //
+                // [intermediate]
+                //  .local _a
+                //  .try tryLabel, catchLabel, finallyLabel, endLabel
+                //  .mark tryLabel
+                //  .nop
+                //      /*tryBlock*/
+                //  .br endLabel
+                //  .catch
+                //  .mark catchLabel
+                //      _a = %error%;
+                //      /*catchBlock*/
+                //  .br endLabel
+                //  .finally
+                //  .mark finallyLabel
+                //      /*finallyBlock*/
+                //  .endfinally
+                //  .endtry
+                //  .mark endLabel
                 beginExceptionBlock();
                 transformAndEmitEmbeddedStatement(node.tryBlock);
                 if (node.catchClause) {
-                    beginCatchBlock(node.catchClause.variableDeclaration);
+                    beginCatchBlock(node.catchClause.variableDeclaration); // TODO: GH#18217
                     transformAndEmitEmbeddedStatement(node.catchClause.block);
                 }
                 if (node.finallyBlock) {
@@ -55041,7 +70376,7 @@ var ts;
             }
         }
         function containsYield(node) {
-            return !!node && (node.transformFlags & 16777216) !== 0;
+            return !!node && (node.transformFlags & 16777216 /* ContainsYield */) !== 0;
         }
         function countInitialNodesWithoutYield(nodes) {
             var numNodes = nodes.length;
@@ -55054,7 +70389,7 @@ var ts;
         }
         function onSubstituteNode(hint, node) {
             node = previousOnSubstituteNode(hint, node);
-            if (hint === 1) {
+            if (hint === 1 /* Expression */) {
                 return substituteExpression(node);
             }
             return node;
@@ -55085,20 +70420,23 @@ var ts;
         }
         function cacheExpression(node) {
             var temp;
-            if (ts.isGeneratedIdentifier(node) || ts.getEmitFlags(node) & 4096) {
+            if (ts.isGeneratedIdentifier(node) || ts.getEmitFlags(node) & 4096 /* HelperName */) {
                 return node;
             }
             temp = ts.createTempVariable(hoistVariableDeclaration);
-            emitAssignment(temp, node, node);
+            emitAssignment(temp, node, /*location*/ node);
             return temp;
         }
         function declareLocal(name) {
             var temp = name
                 ? ts.createUniqueName(name)
-                : ts.createTempVariable(undefined);
+                : ts.createTempVariable(/*recordTempVariable*/ undefined);
             hoistVariableDeclaration(temp);
             return temp;
         }
+        /**
+         * Defines a label, uses as the target of a Break operation.
+         */
         function defineLabel() {
             if (!labelOffsets) {
                 labelOffsets = [];
@@ -55108,10 +70446,18 @@ var ts;
             labelOffsets[label] = -1;
             return label;
         }
+        /**
+         * Marks the current operation with the specified label.
+         */
         function markLabel(label) {
             ts.Debug.assert(labelOffsets !== undefined, "No labels were defined.");
             labelOffsets[label] = operations ? operations.length : 0;
         }
+        /**
+         * Begins a block operation (With, Break/Continue, Try/Catch/Finally)
+         *
+         * @param block Information about the block.
+         */
         function beginBlock(block) {
             if (!blocks) {
                 blocks = [];
@@ -55120,61 +70466,87 @@ var ts;
                 blockStack = [];
             }
             var index = blockActions.length;
-            blockActions[index] = 0;
+            blockActions[index] = 0 /* Open */;
             blockOffsets[index] = operations ? operations.length : 0;
             blocks[index] = block;
             blockStack.push(block);
             return index;
         }
+        /**
+         * Ends the current block operation.
+         */
         function endBlock() {
             var block = peekBlock();
             if (block === undefined)
                 return ts.Debug.fail("beginBlock was never called.");
             var index = blockActions.length;
-            blockActions[index] = 1;
+            blockActions[index] = 1 /* Close */;
             blockOffsets[index] = operations ? operations.length : 0;
             blocks[index] = block;
             blockStack.pop();
             return block;
         }
+        /**
+         * Gets the current open block.
+         */
         function peekBlock() {
             return ts.lastOrUndefined(blockStack);
         }
+        /**
+         * Gets the kind of the current open block.
+         */
         function peekBlockKind() {
             var block = peekBlock();
             return block && block.kind;
         }
+        /**
+         * Begins a code block for a generated `with` statement.
+         *
+         * @param expression An identifier representing expression for the `with` block.
+         */
         function beginWithBlock(expression) {
             var startLabel = defineLabel();
             var endLabel = defineLabel();
             markLabel(startLabel);
             beginBlock({
-                kind: 1,
+                kind: 1 /* With */,
                 expression: expression,
                 startLabel: startLabel,
                 endLabel: endLabel
             });
         }
+        /**
+         * Ends a code block for a generated `with` statement.
+         */
         function endWithBlock() {
-            ts.Debug.assert(peekBlockKind() === 1);
+            ts.Debug.assert(peekBlockKind() === 1 /* With */);
             var block = endBlock();
             markLabel(block.endLabel);
         }
+        /**
+         * Begins a code block for a generated `try` statement.
+         */
         function beginExceptionBlock() {
             var startLabel = defineLabel();
             var endLabel = defineLabel();
             markLabel(startLabel);
             beginBlock({
-                kind: 0,
-                state: 0,
+                kind: 0 /* Exception */,
+                state: 0 /* Try */,
                 startLabel: startLabel,
                 endLabel: endLabel
             });
             emitNop();
             return endLabel;
         }
+        /**
+         * Enters the `catch` clause of a generated `try` statement.
+         *
+         * @param variable The catch variable.
+         */
         function beginCatchBlock(variable) {
-            ts.Debug.assert(peekBlockKind() === 0);
+            ts.Debug.assert(peekBlockKind() === 0 /* Exception */);
+            // generated identifiers should already be unique within a file
             var name;
             if (ts.isGeneratedIdentifier(variable.name)) {
                 name = variable.name;
@@ -55186,39 +70558,45 @@ var ts;
                 if (!renamedCatchVariables) {
                     renamedCatchVariables = ts.createMap();
                     renamedCatchVariableDeclarations = [];
-                    context.enableSubstitution(71);
+                    context.enableSubstitution(71 /* Identifier */);
                 }
                 renamedCatchVariables.set(text, true);
                 renamedCatchVariableDeclarations[ts.getOriginalNodeId(variable)] = name;
             }
             var exception = peekBlock();
-            ts.Debug.assert(exception.state < 1);
+            ts.Debug.assert(exception.state < 1 /* Catch */);
             var endLabel = exception.endLabel;
             emitBreak(endLabel);
             var catchLabel = defineLabel();
             markLabel(catchLabel);
-            exception.state = 1;
+            exception.state = 1 /* Catch */;
             exception.catchVariable = name;
             exception.catchLabel = catchLabel;
-            emitAssignment(name, ts.createCall(ts.createPropertyAccess(state, "sent"), undefined, []));
+            emitAssignment(name, ts.createCall(ts.createPropertyAccess(state, "sent"), /*typeArguments*/ undefined, []));
             emitNop();
         }
+        /**
+         * Enters the `finally` block of a generated `try` statement.
+         */
         function beginFinallyBlock() {
-            ts.Debug.assert(peekBlockKind() === 0);
+            ts.Debug.assert(peekBlockKind() === 0 /* Exception */);
             var exception = peekBlock();
-            ts.Debug.assert(exception.state < 2);
+            ts.Debug.assert(exception.state < 2 /* Finally */);
             var endLabel = exception.endLabel;
             emitBreak(endLabel);
             var finallyLabel = defineLabel();
             markLabel(finallyLabel);
-            exception.state = 2;
+            exception.state = 2 /* Finally */;
             exception.finallyLabel = finallyLabel;
         }
+        /**
+         * Ends the code block for a generated `try` statement.
+         */
         function endExceptionBlock() {
-            ts.Debug.assert(peekBlockKind() === 0);
+            ts.Debug.assert(peekBlockKind() === 0 /* Exception */);
             var exception = endBlock();
             var state = exception.state;
-            if (state < 2) {
+            if (state < 2 /* Finally */) {
                 emitBreak(exception.endLabel);
             }
             else {
@@ -55226,52 +70604,83 @@ var ts;
             }
             markLabel(exception.endLabel);
             emitNop();
-            exception.state = 3;
+            exception.state = 3 /* Done */;
         }
+        /**
+         * Begins a code block that supports `break` or `continue` statements that are defined in
+         * the source tree and not from generated code.
+         *
+         * @param labelText Names from containing labeled statements.
+         */
         function beginScriptLoopBlock() {
             beginBlock({
-                kind: 3,
+                kind: 3 /* Loop */,
                 isScript: true,
                 breakLabel: -1,
                 continueLabel: -1
             });
         }
+        /**
+         * Begins a code block that supports `break` or `continue` statements that are defined in
+         * generated code. Returns a label used to mark the operation to which to jump when a
+         * `break` statement targets this block.
+         *
+         * @param continueLabel A Label used to mark the operation to which to jump when a
+         *                      `continue` statement targets this block.
+         */
         function beginLoopBlock(continueLabel) {
             var breakLabel = defineLabel();
             beginBlock({
-                kind: 3,
+                kind: 3 /* Loop */,
                 isScript: false,
                 breakLabel: breakLabel,
                 continueLabel: continueLabel,
             });
             return breakLabel;
         }
+        /**
+         * Ends a code block that supports `break` or `continue` statements that are defined in
+         * generated code or in the source tree.
+         */
         function endLoopBlock() {
-            ts.Debug.assert(peekBlockKind() === 3);
+            ts.Debug.assert(peekBlockKind() === 3 /* Loop */);
             var block = endBlock();
             var breakLabel = block.breakLabel;
             if (!block.isScript) {
                 markLabel(breakLabel);
             }
         }
+        /**
+         * Begins a code block that supports `break` statements that are defined in the source
+         * tree and not from generated code.
+         *
+         */
         function beginScriptSwitchBlock() {
             beginBlock({
-                kind: 2,
+                kind: 2 /* Switch */,
                 isScript: true,
                 breakLabel: -1
             });
         }
+        /**
+         * Begins a code block that supports `break` statements that are defined in generated code.
+         * Returns a label used to mark the operation to which to jump when a `break` statement
+         * targets this block.
+         */
         function beginSwitchBlock() {
             var breakLabel = defineLabel();
             beginBlock({
-                kind: 2,
+                kind: 2 /* Switch */,
                 isScript: false,
                 breakLabel: breakLabel,
             });
             return breakLabel;
         }
+        /**
+         * Ends a code block that supports `break` statements that are defined in generated code.
+         */
         function endSwitchBlock() {
-            ts.Debug.assert(peekBlockKind() === 2);
+            ts.Debug.assert(peekBlockKind() === 2 /* Switch */);
             var block = endBlock();
             var breakLabel = block.breakLabel;
             if (!block.isScript) {
@@ -55280,7 +70689,7 @@ var ts;
         }
         function beginScriptLabeledBlock(labelText) {
             beginBlock({
-                kind: 4,
+                kind: 4 /* Labeled */,
                 isScript: true,
                 labelText: labelText,
                 breakLabel: -1
@@ -55289,28 +70698,43 @@ var ts;
         function beginLabeledBlock(labelText) {
             var breakLabel = defineLabel();
             beginBlock({
-                kind: 4,
+                kind: 4 /* Labeled */,
                 isScript: false,
                 labelText: labelText,
                 breakLabel: breakLabel
             });
         }
         function endLabeledBlock() {
-            ts.Debug.assert(peekBlockKind() === 4);
+            ts.Debug.assert(peekBlockKind() === 4 /* Labeled */);
             var block = endBlock();
             if (!block.isScript) {
                 markLabel(block.breakLabel);
             }
         }
+        /**
+         * Indicates whether the provided block supports `break` statements.
+         *
+         * @param block A code block.
+         */
         function supportsUnlabeledBreak(block) {
-            return block.kind === 2
-                || block.kind === 3;
+            return block.kind === 2 /* Switch */
+                || block.kind === 3 /* Loop */;
         }
+        /**
+         * Indicates whether the provided block supports `break` statements with labels.
+         *
+         * @param block A code block.
+         */
         function supportsLabeledBreakOrContinue(block) {
-            return block.kind === 4;
+            return block.kind === 4 /* Labeled */;
         }
+        /**
+         * Indicates whether the provided block supports `continue` statements.
+         *
+         * @param block A code block.
+         */
         function supportsUnlabeledContinue(block) {
-            return block.kind === 3;
+            return block.kind === 3 /* Loop */;
         }
         function hasImmediateContainingLabeledBlock(labelText, start) {
             for (var j = start; j >= 0; j--) {
@@ -55326,6 +70750,11 @@ var ts;
             }
             return false;
         }
+        /**
+         * Finds the label that is the target for a `break` statement.
+         *
+         * @param labelText An optional name of a containing labeled statement.
+         */
         function findBreakTarget(labelText) {
             if (blockStack) {
                 if (labelText) {
@@ -55350,6 +70779,11 @@ var ts;
             }
             return 0;
         }
+        /**
+         * Finds the label that is the target for a `continue` statement.
+         *
+         * @param labelText An optional name of a containing labeled statement.
+         */
         function findContinueTarget(labelText) {
             if (blockStack) {
                 if (labelText) {
@@ -55371,6 +70805,11 @@ var ts;
             }
             return 0;
         }
+        /**
+         * Creates an expression that can be used to indicate the value for a label.
+         *
+         * @param label A label.
+         */
         function createLabel(label) {
             if (label !== undefined && label > 0) {
                 if (labelExpressions === undefined) {
@@ -55387,64 +70826,153 @@ var ts;
             }
             return ts.createOmittedExpression();
         }
+        /**
+         * Creates a numeric literal for the provided instruction.
+         */
         function createInstruction(instruction) {
             var literal = ts.createLiteral(instruction);
-            ts.addSyntheticTrailingComment(literal, 3, getInstructionName(instruction));
+            ts.addSyntheticTrailingComment(literal, 3 /* MultiLineCommentTrivia */, getInstructionName(instruction));
             return literal;
         }
+        /**
+         * Creates a statement that can be used indicate a Break operation to the provided label.
+         *
+         * @param label A label.
+         * @param location An optional source map location for the statement.
+         */
         function createInlineBreak(label, location) {
             ts.Debug.assertLessThan(0, label, "Invalid label");
             return ts.setTextRange(ts.createReturn(ts.createArrayLiteral([
-                createInstruction(3),
+                createInstruction(3 /* Break */),
                 createLabel(label)
             ])), location);
         }
+        /**
+         * Creates a statement that can be used indicate a Return operation.
+         *
+         * @param expression The expression for the return statement.
+         * @param location An optional source map location for the statement.
+         */
         function createInlineReturn(expression, location) {
             return ts.setTextRange(ts.createReturn(ts.createArrayLiteral(expression
-                ? [createInstruction(2), expression]
-                : [createInstruction(2)])), location);
+                ? [createInstruction(2 /* Return */), expression]
+                : [createInstruction(2 /* Return */)])), location);
         }
+        /**
+         * Creates an expression that can be used to resume from a Yield operation.
+         */
         function createGeneratorResume(location) {
-            return ts.setTextRange(ts.createCall(ts.createPropertyAccess(state, "sent"), undefined, []), location);
+            return ts.setTextRange(ts.createCall(ts.createPropertyAccess(state, "sent"), 
+            /*typeArguments*/ undefined, []), location);
         }
+        /**
+         * Emits an empty instruction.
+         */
         function emitNop() {
-            emitWorker(0);
+            emitWorker(0 /* Nop */);
         }
+        /**
+         * Emits a Statement.
+         *
+         * @param node A statement.
+         */
         function emitStatement(node) {
             if (node) {
-                emitWorker(1, [node]);
+                emitWorker(1 /* Statement */, [node]);
             }
             else {
                 emitNop();
             }
         }
+        /**
+         * Emits an Assignment operation.
+         *
+         * @param left The left-hand side of the assignment.
+         * @param right The right-hand side of the assignment.
+         * @param location An optional source map location for the assignment.
+         */
         function emitAssignment(left, right, location) {
-            emitWorker(2, [left, right], location);
+            emitWorker(2 /* Assign */, [left, right], location);
         }
+        /**
+         * Emits a Break operation to the specified label.
+         *
+         * @param label A label.
+         * @param location An optional source map location for the assignment.
+         */
         function emitBreak(label, location) {
-            emitWorker(3, [label], location);
+            emitWorker(3 /* Break */, [label], location);
         }
+        /**
+         * Emits a Break operation to the specified label when a condition evaluates to a truthy
+         * value at runtime.
+         *
+         * @param label A label.
+         * @param condition The condition.
+         * @param location An optional source map location for the assignment.
+         */
         function emitBreakWhenTrue(label, condition, location) {
-            emitWorker(4, [label, condition], location);
+            emitWorker(4 /* BreakWhenTrue */, [label, condition], location);
         }
+        /**
+         * Emits a Break to the specified label when a condition evaluates to a falsey value at
+         * runtime.
+         *
+         * @param label A label.
+         * @param condition The condition.
+         * @param location An optional source map location for the assignment.
+         */
         function emitBreakWhenFalse(label, condition, location) {
-            emitWorker(5, [label, condition], location);
+            emitWorker(5 /* BreakWhenFalse */, [label, condition], location);
         }
+        /**
+         * Emits a YieldStar operation for the provided expression.
+         *
+         * @param expression An optional value for the yield operation.
+         * @param location An optional source map location for the assignment.
+         */
         function emitYieldStar(expression, location) {
-            emitWorker(7, [expression], location);
+            emitWorker(7 /* YieldStar */, [expression], location);
         }
+        /**
+         * Emits a Yield operation for the provided expression.
+         *
+         * @param expression An optional value for the yield operation.
+         * @param location An optional source map location for the assignment.
+         */
         function emitYield(expression, location) {
-            emitWorker(6, [expression], location);
+            emitWorker(6 /* Yield */, [expression], location);
         }
+        /**
+         * Emits a Return operation for the provided expression.
+         *
+         * @param expression An optional value for the operation.
+         * @param location An optional source map location for the assignment.
+         */
         function emitReturn(expression, location) {
-            emitWorker(8, [expression], location);
+            emitWorker(8 /* Return */, [expression], location);
         }
+        /**
+         * Emits a Throw operation for the provided expression.
+         *
+         * @param expression A value for the operation.
+         * @param location An optional source map location for the assignment.
+         */
         function emitThrow(expression, location) {
-            emitWorker(9, [expression], location);
+            emitWorker(9 /* Throw */, [expression], location);
         }
+        /**
+         * Emits an Endfinally operation. This is used to handle `finally` block semantics.
+         */
         function emitEndfinally() {
-            emitWorker(10);
+            emitWorker(10 /* Endfinally */);
         }
+        /**
+         * Emits an operation.
+         *
+         * @param code The OpCode for the operation.
+         * @param args The optional arguments for the operation.
+         */
         function emitWorker(code, args, location) {
             if (operations === undefined) {
                 operations = [];
@@ -55452,6 +70980,7 @@ var ts;
                 operationLocations = [];
             }
             if (labelOffsets === undefined) {
+                // mark entry point
                 markLabel(defineLabel());
             }
             var operationIndex = operations.length;
@@ -55459,6 +70988,9 @@ var ts;
             operationArguments[operationIndex] = args;
             operationLocations[operationIndex] = location;
         }
+        /**
+         * Builds the generator function body.
+         */
         function build() {
             blockIndex = 0;
             labelNumber = 0;
@@ -55471,8 +71003,17 @@ var ts;
             currentExceptionBlock = undefined;
             withBlockStack = undefined;
             var buildResult = buildStatements();
-            return createGeneratorHelper(context, ts.setEmitFlags(ts.createFunctionExpression(undefined, undefined, undefined, undefined, [ts.createParameter(undefined, undefined, undefined, state)], undefined, ts.createBlock(buildResult, buildResult.length > 0)), 524288));
+            return createGeneratorHelper(context, ts.setEmitFlags(ts.createFunctionExpression(
+            /*modifiers*/ undefined, 
+            /*asteriskToken*/ undefined, 
+            /*name*/ undefined, 
+            /*typeParameters*/ undefined, [ts.createParameter(/*decorators*/ undefined, /*modifiers*/ undefined, /*dotDotDotToken*/ undefined, state)], 
+            /*type*/ undefined, ts.createBlock(buildResult, 
+            /*multiLine*/ buildResult.length > 0)), 524288 /* ReuseTempVariableScope */));
         }
+        /**
+         * Builds the statements for the generator function body.
+         */
         function buildStatements() {
             if (operations) {
                 for (var operationIndex = 0; operationIndex < operations.length; operationIndex++) {
@@ -55493,33 +71034,49 @@ var ts;
             }
             return [];
         }
+        /**
+         * Flush the current label and advance to a new label.
+         */
         function flushLabel() {
             if (!statements) {
                 return;
             }
-            appendLabel(!lastOperationWasAbrupt);
+            appendLabel(/*markLabelEnd*/ !lastOperationWasAbrupt);
             lastOperationWasAbrupt = false;
             lastOperationWasCompletion = false;
             labelNumber++;
         }
+        /**
+         * Flush the final label of the generator function body.
+         */
         function flushFinalLabel(operationIndex) {
             if (isFinalLabelReachable(operationIndex)) {
                 tryEnterLabel(operationIndex);
                 withBlockStack = undefined;
-                writeReturn(undefined, undefined);
+                writeReturn(/*expression*/ undefined, /*operationLocation*/ undefined);
             }
             if (statements && clauses) {
-                appendLabel(false);
+                appendLabel(/*markLabelEnd*/ false);
             }
             updateLabelExpressions();
         }
+        /**
+         * Tests whether the final label of the generator function body
+         * is reachable by user code.
+         */
         function isFinalLabelReachable(operationIndex) {
+            // if the last operation was *not* a completion (return/throw) then
+            // the final label is reachable.
             if (!lastOperationWasCompletion) {
                 return true;
             }
+            // if there are no labels defined or referenced, then the final label is
+            // not reachable.
             if (!labelOffsets || !labelExpressions) {
                 return false;
             }
+            // if the label for this offset is referenced, then the final label
+            // is reachable.
             for (var label = 0; label < labelOffsets.length; label++) {
                 if (labelOffsets[label] === operationIndex && labelExpressions[label]) {
                     return true;
@@ -55527,20 +71084,33 @@ var ts;
             }
             return false;
         }
+        /**
+         * Appends a case clause for the last label and sets the new label.
+         *
+         * @param markLabelEnd Indicates that the transition between labels was a fall-through
+         *                     from a previous case clause and the change in labels should be
+         *                     reflected on the `state` object.
+         */
         function appendLabel(markLabelEnd) {
             if (!clauses) {
                 clauses = [];
             }
             if (statements) {
                 if (withBlockStack) {
+                    // The previous label was nested inside one or more `with` blocks, so we
+                    // surround the statements in generated `with` blocks to create the same environment.
                     for (var i = withBlockStack.length - 1; i >= 0; i--) {
                         var withBlock = withBlockStack[i];
                         statements = [ts.createWith(withBlock.expression, ts.createBlock(statements))];
                     }
                 }
                 if (currentExceptionBlock) {
+                    // The previous label was nested inside of an exception block, so we must
+                    // indicate entry into a protected region by pushing the label numbers
+                    // for each block in the protected region.
                     var startLabel = currentExceptionBlock.startLabel, catchLabel = currentExceptionBlock.catchLabel, finallyLabel = currentExceptionBlock.finallyLabel, endLabel = currentExceptionBlock.endLabel;
-                    statements.unshift(ts.createStatement(ts.createCall(ts.createPropertyAccess(ts.createPropertyAccess(state, "trys"), "push"), undefined, [
+                    statements.unshift(ts.createStatement(ts.createCall(ts.createPropertyAccess(ts.createPropertyAccess(state, "trys"), "push"), 
+                    /*typeArguments*/ undefined, [
                         ts.createArrayLiteral([
                             createLabel(startLabel),
                             createLabel(catchLabel),
@@ -55551,12 +71121,17 @@ var ts;
                     currentExceptionBlock = undefined;
                 }
                 if (markLabelEnd) {
+                    // The case clause for the last label falls through to this label, so we
+                    // add an assignment statement to reflect the change in labels.
                     statements.push(ts.createStatement(ts.createAssignment(ts.createPropertyAccess(state, "label"), ts.createLiteral(labelNumber + 1))));
                 }
             }
             clauses.push(ts.createCaseClause(ts.createLiteral(labelNumber), statements || []));
             statements = undefined;
         }
+        /**
+         * Tries to enter into a new label at the current operation index.
+         */
         function tryEnterLabel(operationIndex) {
             if (!labelOffsets) {
                 return;
@@ -55576,6 +71151,9 @@ var ts;
                 }
             }
         }
+        /**
+         * Updates literal expressions for labels with actual label numbers.
+         */
         function updateLabelExpressions() {
             if (labelExpressions !== undefined && labelNumbers !== undefined) {
                 for (var labelNumber_1 = 0; labelNumber_1 < labelNumbers.length; labelNumber_1++) {
@@ -55595,14 +71173,17 @@ var ts;
                 }
             }
         }
+        /**
+         * Tries to enter or leave a code block.
+         */
         function tryEnterOrLeaveBlock(operationIndex) {
             if (blocks) {
                 for (; blockIndex < blockActions.length && blockOffsets[blockIndex] <= operationIndex; blockIndex++) {
                     var block = blocks[blockIndex];
                     var blockAction = blockActions[blockIndex];
                     switch (block.kind) {
-                        case 0:
-                            if (blockAction === 0) {
+                        case 0 /* Exception */:
+                            if (blockAction === 0 /* Open */) {
                                 if (!exceptionBlockStack) {
                                     exceptionBlockStack = [];
                                 }
@@ -55612,64 +71193,76 @@ var ts;
                                 exceptionBlockStack.push(currentExceptionBlock);
                                 currentExceptionBlock = block;
                             }
-                            else if (blockAction === 1) {
+                            else if (blockAction === 1 /* Close */) {
                                 currentExceptionBlock = exceptionBlockStack.pop();
                             }
                             break;
-                        case 1:
-                            if (blockAction === 0) {
+                        case 1 /* With */:
+                            if (blockAction === 0 /* Open */) {
                                 if (!withBlockStack) {
                                     withBlockStack = [];
                                 }
                                 withBlockStack.push(block);
                             }
-                            else if (blockAction === 1) {
+                            else if (blockAction === 1 /* Close */) {
                                 withBlockStack.pop();
                             }
                             break;
+                        // default: do nothing
                     }
                 }
             }
         }
+        /**
+         * Writes an operation as a statement to the current label's statement list.
+         *
+         * @param operation The OpCode of the operation
+         */
         function writeOperation(operationIndex) {
             tryEnterLabel(operationIndex);
             tryEnterOrLeaveBlock(operationIndex);
+            // early termination, nothing else to process in this label
             if (lastOperationWasAbrupt) {
                 return;
             }
             lastOperationWasAbrupt = false;
             lastOperationWasCompletion = false;
             var opcode = operations[operationIndex];
-            if (opcode === 0) {
+            if (opcode === 0 /* Nop */) {
                 return;
             }
-            else if (opcode === 10) {
+            else if (opcode === 10 /* Endfinally */) {
                 return writeEndfinally();
             }
             var args = operationArguments[operationIndex];
-            if (opcode === 1) {
+            if (opcode === 1 /* Statement */) {
                 return writeStatement(args[0]);
             }
             var location = operationLocations[operationIndex];
             switch (opcode) {
-                case 2:
+                case 2 /* Assign */:
                     return writeAssign(args[0], args[1], location);
-                case 3:
+                case 3 /* Break */:
                     return writeBreak(args[0], location);
-                case 4:
+                case 4 /* BreakWhenTrue */:
                     return writeBreakWhenTrue(args[0], args[1], location);
-                case 5:
+                case 5 /* BreakWhenFalse */:
                     return writeBreakWhenFalse(args[0], args[1], location);
-                case 6:
+                case 6 /* Yield */:
                     return writeYield(args[0], location);
-                case 7:
+                case 7 /* YieldStar */:
                     return writeYieldStar(args[0], location);
-                case 8:
+                case 8 /* Return */:
                     return writeReturn(args[0], location);
-                case 9:
+                case 9 /* Throw */:
                     return writeThrow(args[0], location);
             }
         }
+        /**
+         * Writes a statement to the current label's statement list.
+         *
+         * @param statement A statement to write.
+         */
         function writeStatement(statement) {
             if (statement) {
                 if (!statements) {
@@ -55680,65 +71273,179 @@ var ts;
                 }
             }
         }
+        /**
+         * Writes an Assign operation to the current label's statement list.
+         *
+         * @param left The left-hand side of the assignment.
+         * @param right The right-hand side of the assignment.
+         * @param operationLocation The source map location for the operation.
+         */
         function writeAssign(left, right, operationLocation) {
             writeStatement(ts.setTextRange(ts.createStatement(ts.createAssignment(left, right)), operationLocation));
         }
+        /**
+         * Writes a Throw operation to the current label's statement list.
+         *
+         * @param expression The value to throw.
+         * @param operationLocation The source map location for the operation.
+         */
         function writeThrow(expression, operationLocation) {
             lastOperationWasAbrupt = true;
             lastOperationWasCompletion = true;
             writeStatement(ts.setTextRange(ts.createThrow(expression), operationLocation));
         }
+        /**
+         * Writes a Return operation to the current label's statement list.
+         *
+         * @param expression The value to return.
+         * @param operationLocation The source map location for the operation.
+         */
         function writeReturn(expression, operationLocation) {
             lastOperationWasAbrupt = true;
             lastOperationWasCompletion = true;
             writeStatement(ts.setEmitFlags(ts.setTextRange(ts.createReturn(ts.createArrayLiteral(expression
-                ? [createInstruction(2), expression]
-                : [createInstruction(2)])), operationLocation), 384));
+                ? [createInstruction(2 /* Return */), expression]
+                : [createInstruction(2 /* Return */)])), operationLocation), 384 /* NoTokenSourceMaps */));
         }
+        /**
+         * Writes a Break operation to the current label's statement list.
+         *
+         * @param label The label for the Break.
+         * @param operationLocation The source map location for the operation.
+         */
         function writeBreak(label, operationLocation) {
             lastOperationWasAbrupt = true;
             writeStatement(ts.setEmitFlags(ts.setTextRange(ts.createReturn(ts.createArrayLiteral([
-                createInstruction(3),
+                createInstruction(3 /* Break */),
                 createLabel(label)
-            ])), operationLocation), 384));
+            ])), operationLocation), 384 /* NoTokenSourceMaps */));
         }
+        /**
+         * Writes a BreakWhenTrue operation to the current label's statement list.
+         *
+         * @param label The label for the Break.
+         * @param condition The condition for the Break.
+         * @param operationLocation The source map location for the operation.
+         */
         function writeBreakWhenTrue(label, condition, operationLocation) {
             writeStatement(ts.setEmitFlags(ts.createIf(condition, ts.setEmitFlags(ts.setTextRange(ts.createReturn(ts.createArrayLiteral([
-                createInstruction(3),
+                createInstruction(3 /* Break */),
                 createLabel(label)
-            ])), operationLocation), 384)), 1));
+            ])), operationLocation), 384 /* NoTokenSourceMaps */)), 1 /* SingleLine */));
         }
+        /**
+         * Writes a BreakWhenFalse operation to the current label's statement list.
+         *
+         * @param label The label for the Break.
+         * @param condition The condition for the Break.
+         * @param operationLocation The source map location for the operation.
+         */
         function writeBreakWhenFalse(label, condition, operationLocation) {
             writeStatement(ts.setEmitFlags(ts.createIf(ts.createLogicalNot(condition), ts.setEmitFlags(ts.setTextRange(ts.createReturn(ts.createArrayLiteral([
-                createInstruction(3),
+                createInstruction(3 /* Break */),
                 createLabel(label)
-            ])), operationLocation), 384)), 1));
+            ])), operationLocation), 384 /* NoTokenSourceMaps */)), 1 /* SingleLine */));
         }
+        /**
+         * Writes a Yield operation to the current label's statement list.
+         *
+         * @param expression The expression to yield.
+         * @param operationLocation The source map location for the operation.
+         */
         function writeYield(expression, operationLocation) {
             lastOperationWasAbrupt = true;
             writeStatement(ts.setEmitFlags(ts.setTextRange(ts.createReturn(ts.createArrayLiteral(expression
-                ? [createInstruction(4), expression]
-                : [createInstruction(4)])), operationLocation), 384));
+                ? [createInstruction(4 /* Yield */), expression]
+                : [createInstruction(4 /* Yield */)])), operationLocation), 384 /* NoTokenSourceMaps */));
         }
+        /**
+         * Writes a YieldStar instruction to the current label's statement list.
+         *
+         * @param expression The expression to yield.
+         * @param operationLocation The source map location for the operation.
+         */
         function writeYieldStar(expression, operationLocation) {
             lastOperationWasAbrupt = true;
             writeStatement(ts.setEmitFlags(ts.setTextRange(ts.createReturn(ts.createArrayLiteral([
-                createInstruction(5),
+                createInstruction(5 /* YieldStar */),
                 expression
-            ])), operationLocation), 384));
+            ])), operationLocation), 384 /* NoTokenSourceMaps */));
         }
+        /**
+         * Writes an Endfinally instruction to the current label's statement list.
+         */
         function writeEndfinally() {
             lastOperationWasAbrupt = true;
             writeStatement(ts.createReturn(ts.createArrayLiteral([
-                createInstruction(7)
+                createInstruction(7 /* Endfinally */)
             ])));
         }
     }
     ts.transformGenerators = transformGenerators;
     function createGeneratorHelper(context, body) {
         context.requestEmitHelper(generatorHelper);
-        return ts.createCall(ts.getHelperName("__generator"), undefined, [ts.createThis(), body]);
+        return ts.createCall(ts.getHelperName("__generator"), 
+        /*typeArguments*/ undefined, [ts.createThis(), body]);
     }
+    // The __generator helper is used by down-level transformations to emulate the runtime
+    // semantics of an ES2015 generator function. When called, this helper returns an
+    // object that implements the Iterator protocol, in that it has `next`, `return`, and
+    // `throw` methods that step through the generator when invoked.
+    //
+    // parameters:
+    //  @param thisArg  The value to use as the `this` binding for the transformed generator body.
+    //  @param body     A function that acts as the transformed generator body.
+    //
+    // variables:
+    //  _       Persistent state for the generator that is shared between the helper and the
+    //          generator body. The state object has the following members:
+    //            sent() - A method that returns or throws the current completion value.
+    //            label  - The next point at which to resume evaluation of the generator body.
+    //            trys   - A stack of protected regions (try/catch/finally blocks).
+    //            ops    - A stack of pending instructions when inside of a finally block.
+    //  f       A value indicating whether the generator is executing.
+    //  y       An iterator to delegate for a yield*.
+    //  t       A temporary variable that holds one of the following values (note that these
+    //          cases do not overlap):
+    //          - The completion value when resuming from a `yield` or `yield*`.
+    //          - The error value for a catch block.
+    //          - The current protected region (array of try/catch/finally/end labels).
+    //          - The verb (`next`, `throw`, or `return` method) to delegate to the expression
+    //            of a `yield*`.
+    //          - The result of evaluating the verb delegated to the expression of a `yield*`.
+    //
+    // functions:
+    //  verb(n)     Creates a bound callback to the `step` function for opcode `n`.
+    //  step(op)    Evaluates opcodes in a generator body until execution is suspended or
+    //              completed.
+    //
+    // The __generator helper understands a limited set of instructions:
+    //  0: next(value?)     - Start or resume the generator with the specified value.
+    //  1: throw(error)     - Resume the generator with an exception. If the generator is
+    //                        suspended inside of one or more protected regions, evaluates
+    //                        any intervening finally blocks between the current label and
+    //                        the nearest catch block or function boundary. If uncaught, the
+    //                        exception is thrown to the caller.
+    //  2: return(value?)   - Resume the generator as if with a return. If the generator is
+    //                        suspended inside of one or more protected regions, evaluates any
+    //                        intervening finally blocks.
+    //  3: break(label)     - Jump to the specified label. If the label is outside of the
+    //                        current protected region, evaluates any intervening finally
+    //                        blocks.
+    //  4: yield(value?)    - Yield execution to the caller with an optional value. When
+    //                        resumed, the generator will continue at the next label.
+    //  5: yield*(value)    - Delegates evaluation to the supplied iterator. When
+    //                        delegation completes, the generator will continue at the next
+    //                        label.
+    //  6: catch(error)     - Handles an exception thrown from within the generator body. If
+    //                        the current label is inside of one or more protected regions,
+    //                        evaluates any intervening finally blocks between the current
+    //                        label and the nearest catch block or function boundary. If
+    //                        uncaught, the exception is thrown to the caller.
+    //  7: endfinally       - Ends a finally block, resuming the last instruction prior to
+    //                        entering a finally block.
+    //
+    // For examples of how these are used, see the comments in ./transformers/generators.ts
     var generatorHelper = {
         name: "typescript:generator",
         scoped: false,
@@ -55746,6 +71453,7 @@ var ts;
         text: "\n            var __generator = (this && this.__generator) || function (thisArg, body) {\n                var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;\n                return g = { next: verb(0), \"throw\": verb(1), \"return\": verb(2) }, typeof Symbol === \"function\" && (g[Symbol.iterator] = function() { return this; }), g;\n                function verb(n) { return function (v) { return step([n, v]); }; }\n                function step(op) {\n                    if (f) throw new TypeError(\"Generator is already executing.\");\n                    while (_) try {\n                        if (f = 1, y && (t = op[0] & 2 ? y[\"return\"] : op[0] ? y[\"throw\"] || ((t = y[\"return\"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;\n                        if (y = 0, t) op = [op[0] & 2, t.value];\n                        switch (op[0]) {\n                            case 0: case 1: t = op; break;\n                            case 4: _.label++; return { value: op[1], done: false };\n                            case 5: _.label++; y = op[1]; op = [0]; continue;\n                            case 7: op = _.ops.pop(); _.trys.pop(); continue;\n                            default:\n                                if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }\n                                if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }\n                                if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }\n                                if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }\n                                if (t[2]) _.ops.pop();\n                                _.trys.pop(); continue;\n                        }\n                        op = body.call(thisArg, _);\n                    } catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }\n                    if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };\n                }\n            };"
     };
 })(ts || (ts = {}));
+/*@internal*/
 var ts;
 (function (ts) {
     function transformModule(context) {
@@ -55766,26 +71474,32 @@ var ts;
         var previousOnEmitNode = context.onEmitNode;
         context.onSubstituteNode = onSubstituteNode;
         context.onEmitNode = onEmitNode;
-        context.enableSubstitution(71);
-        context.enableSubstitution(200);
-        context.enableSubstitution(198);
-        context.enableSubstitution(199);
-        context.enableSubstitution(271);
-        context.enableEmitNotification(274);
-        var moduleInfoMap = [];
-        var deferredExports = [];
-        var currentSourceFile;
-        var currentModuleInfo;
-        var noSubstitution;
+        context.enableSubstitution(71 /* Identifier */); // Substitutes expression identifiers with imported/exported symbols.
+        context.enableSubstitution(200 /* BinaryExpression */); // Substitutes assignments to exported symbols.
+        context.enableSubstitution(198 /* PrefixUnaryExpression */); // Substitutes updates to exported symbols.
+        context.enableSubstitution(199 /* PostfixUnaryExpression */); // Substitutes updates to exported symbols.
+        context.enableSubstitution(271 /* ShorthandPropertyAssignment */); // Substitutes shorthand property assignments for imported/exported symbols.
+        context.enableEmitNotification(274 /* SourceFile */); // Restore state when substituting nodes in a file.
+        var moduleInfoMap = []; // The ExternalModuleInfo for each file.
+        var deferredExports = []; // Exports to defer until an EndOfDeclarationMarker is found.
+        var currentSourceFile; // The current file.
+        var currentModuleInfo; // The ExternalModuleInfo for the current file.
+        var noSubstitution; // Set of nodes for which substitution rules should be ignored.
         var needUMDDynamicImportHelper;
         return ts.chainBundle(transformSourceFile);
+        /**
+         * Transforms the module aspects of a SourceFile.
+         *
+         * @param node The SourceFile node.
+         */
         function transformSourceFile(node) {
-            if (node.isDeclarationFile || !(ts.isEffectiveExternalModule(node, compilerOptions) || node.transformFlags & 67108864)) {
+            if (node.isDeclarationFile || !(ts.isEffectiveExternalModule(node, compilerOptions) || node.transformFlags & 67108864 /* ContainsDynamicImport */)) {
                 return node;
             }
             currentSourceFile = node;
             currentModuleInfo = ts.collectExternalModuleInfo(node, resolver, compilerOptions);
             moduleInfoMap[ts.getOriginalNodeId(node)] = currentModuleInfo;
+            // Perform the transformation.
             var transformModule = getTransformModuleDelegate(moduleKind);
             var updated = transformModule(node);
             currentSourceFile = undefined;
@@ -55799,6 +71513,11 @@ var ts;
             }
             return false;
         }
+        /**
+         * Transforms a SourceFile into a CommonJS module.
+         *
+         * @param node The SourceFile node.
+         */
         function transformCommonJSModule(node) {
             startLexicalEnvironment();
             var statements = [];
@@ -55809,48 +71528,105 @@ var ts;
             }
             ts.append(statements, ts.visitNode(currentModuleInfo.externalHelpersImportDeclaration, sourceElementVisitor, ts.isStatement));
             ts.addRange(statements, ts.visitNodes(node.statements, sourceElementVisitor, ts.isStatement, statementOffset));
-            addExportEqualsIfNeeded(statements, false);
+            addExportEqualsIfNeeded(statements, /*emitAsReturn*/ false);
             ts.prependStatements(statements, endLexicalEnvironment());
             var updated = ts.updateSourceFileNode(node, ts.setTextRange(ts.createNodeArray(statements), node.statements));
             if (currentModuleInfo.hasExportStarsToExportValues && !compilerOptions.importHelpers) {
+                // If we have any `export * from ...` declarations
+                // we need to inform the emitter to add the __export helper.
                 ts.addEmitHelper(updated, exportStarHelper);
             }
             ts.addEmitHelpers(updated, context.readEmitHelpers());
             return updated;
         }
+        /**
+         * Transforms a SourceFile into an AMD module.
+         *
+         * @param node The SourceFile node.
+         */
         function transformAMDModule(node) {
             var define = ts.createIdentifier("define");
             var moduleName = ts.tryGetModuleNameFromFile(node, host, compilerOptions);
-            var _a = collectAsynchronousDependencies(node, true), aliasedModuleNames = _a.aliasedModuleNames, unaliasedModuleNames = _a.unaliasedModuleNames, importAliasNames = _a.importAliasNames;
+            // An AMD define function has the following shape:
+            //
+            //     define(id?, dependencies?, factory);
+            //
+            // This has the shape of the following:
+            //
+            //     define(name, ["module1", "module2"], function (module1Alias) { ... }
+            //
+            // The location of the alias in the parameter list in the factory function needs to
+            // match the position of the module name in the dependency list.
+            //
+            // To ensure this is true in cases of modules with no aliases, e.g.:
+            //
+            //     import "module"
+            //
+            // or
+            //
+            //     /// <amd-dependency path= "a.css" />
+            //
+            // we need to add modules without alias names to the end of the dependencies list
+            var _a = collectAsynchronousDependencies(node, /*includeNonAmdDependencies*/ true), aliasedModuleNames = _a.aliasedModuleNames, unaliasedModuleNames = _a.unaliasedModuleNames, importAliasNames = _a.importAliasNames;
+            // Create an updated SourceFile:
+            //
+            //     define(moduleName?, ["module1", "module2"], function ...
             var updated = ts.updateSourceFileNode(node, ts.setTextRange(ts.createNodeArray([
-                ts.createStatement(ts.createCall(define, undefined, (moduleName ? [moduleName] : []).concat([
+                ts.createStatement(ts.createCall(define, 
+                /*typeArguments*/ undefined, (moduleName ? [moduleName] : []).concat([
+                    // Add the dependency array argument:
+                    //
+                    //     ["require", "exports", module1", "module2", ...]
                     ts.createArrayLiteral([
                         ts.createLiteral("require"),
                         ts.createLiteral("exports")
                     ].concat(aliasedModuleNames, unaliasedModuleNames)),
-                    ts.createFunctionExpression(undefined, undefined, undefined, undefined, [
-                        ts.createParameter(undefined, undefined, undefined, "require"),
-                        ts.createParameter(undefined, undefined, undefined, "exports")
-                    ].concat(importAliasNames), undefined, transformAsynchronousModuleBody(node))
+                    // Add the module body function argument:
+                    //
+                    //     function (require, exports, module1, module2) ...
+                    ts.createFunctionExpression(
+                    /*modifiers*/ undefined, 
+                    /*asteriskToken*/ undefined, 
+                    /*name*/ undefined, 
+                    /*typeParameters*/ undefined, [
+                        ts.createParameter(/*decorators*/ undefined, /*modifiers*/ undefined, /*dotDotDotToken*/ undefined, "require"),
+                        ts.createParameter(/*decorators*/ undefined, /*modifiers*/ undefined, /*dotDotDotToken*/ undefined, "exports")
+                    ].concat(importAliasNames), 
+                    /*type*/ undefined, transformAsynchronousModuleBody(node))
                 ])))
-            ]), node.statements));
+            ]), 
+            /*location*/ node.statements));
             ts.addEmitHelpers(updated, context.readEmitHelpers());
             return updated;
         }
+        /**
+         * Transforms a SourceFile into a UMD module.
+         *
+         * @param node The SourceFile node.
+         */
         function transformUMDModule(node) {
-            var _a = collectAsynchronousDependencies(node, false), aliasedModuleNames = _a.aliasedModuleNames, unaliasedModuleNames = _a.unaliasedModuleNames, importAliasNames = _a.importAliasNames;
+            var _a = collectAsynchronousDependencies(node, /*includeNonAmdDependencies*/ false), aliasedModuleNames = _a.aliasedModuleNames, unaliasedModuleNames = _a.unaliasedModuleNames, importAliasNames = _a.importAliasNames;
             var moduleName = ts.tryGetModuleNameFromFile(node, host, compilerOptions);
-            var umdHeader = ts.createFunctionExpression(undefined, undefined, undefined, undefined, [ts.createParameter(undefined, undefined, undefined, "factory")], undefined, ts.setTextRange(ts.createBlock([
+            var umdHeader = ts.createFunctionExpression(
+            /*modifiers*/ undefined, 
+            /*asteriskToken*/ undefined, 
+            /*name*/ undefined, 
+            /*typeParameters*/ undefined, [ts.createParameter(/*decorators*/ undefined, /*modifiers*/ undefined, /*dotDotDotToken*/ undefined, "factory")], 
+            /*type*/ undefined, ts.setTextRange(ts.createBlock([
                 ts.createIf(ts.createLogicalAnd(ts.createTypeCheck(ts.createIdentifier("module"), "object"), ts.createTypeCheck(ts.createPropertyAccess(ts.createIdentifier("module"), "exports"), "object")), ts.createBlock([
-                    ts.createVariableStatement(undefined, [
-                        ts.createVariableDeclaration("v", undefined, ts.createCall(ts.createIdentifier("factory"), undefined, [
+                    ts.createVariableStatement(
+                    /*modifiers*/ undefined, [
+                        ts.createVariableDeclaration("v", 
+                        /*type*/ undefined, ts.createCall(ts.createIdentifier("factory"), 
+                        /*typeArguments*/ undefined, [
                             ts.createIdentifier("require"),
                             ts.createIdentifier("exports")
                         ]))
                     ]),
-                    ts.setEmitFlags(ts.createIf(ts.createStrictInequality(ts.createIdentifier("v"), ts.createIdentifier("undefined")), ts.createStatement(ts.createAssignment(ts.createPropertyAccess(ts.createIdentifier("module"), "exports"), ts.createIdentifier("v")))), 1)
+                    ts.setEmitFlags(ts.createIf(ts.createStrictInequality(ts.createIdentifier("v"), ts.createIdentifier("undefined")), ts.createStatement(ts.createAssignment(ts.createPropertyAccess(ts.createIdentifier("module"), "exports"), ts.createIdentifier("v")))), 1 /* SingleLine */)
                 ]), ts.createIf(ts.createLogicalAnd(ts.createTypeCheck(ts.createIdentifier("define"), "function"), ts.createPropertyAccess(ts.createIdentifier("define"), "amd")), ts.createBlock([
-                    ts.createStatement(ts.createCall(ts.createIdentifier("define"), undefined, (moduleName ? [moduleName] : []).concat([
+                    ts.createStatement(ts.createCall(ts.createIdentifier("define"), 
+                    /*typeArguments*/ undefined, (moduleName ? [moduleName] : []).concat([
                         ts.createArrayLiteral([
                             ts.createLiteral("require"),
                             ts.createLiteral("exports")
@@ -55858,27 +71634,62 @@ var ts;
                         ts.createIdentifier("factory")
                     ])))
                 ])))
-            ], true), undefined));
+            ], 
+            /*multiLine*/ true), 
+            /*location*/ undefined));
+            // Create an updated SourceFile:
+            //
+            //  (function (factory) {
+            //      if (typeof module === "object" && typeof module.exports === "object") {
+            //          var v = factory(require, exports);
+            //          if (v !== undefined) module.exports = v;
+            //      }
+            //      else if (typeof define === 'function' && define.amd) {
+            //          define(["require", "exports"], factory);
+            //      }
+            //  })(function ...)
             var updated = ts.updateSourceFileNode(node, ts.setTextRange(ts.createNodeArray([
-                ts.createStatement(ts.createCall(umdHeader, undefined, [
-                    ts.createFunctionExpression(undefined, undefined, undefined, undefined, [
-                        ts.createParameter(undefined, undefined, undefined, "require"),
-                        ts.createParameter(undefined, undefined, undefined, "exports")
-                    ].concat(importAliasNames), undefined, transformAsynchronousModuleBody(node))
+                ts.createStatement(ts.createCall(umdHeader, 
+                /*typeArguments*/ undefined, [
+                    // Add the module body function argument:
+                    //
+                    //     function (require, exports) ...
+                    ts.createFunctionExpression(
+                    /*modifiers*/ undefined, 
+                    /*asteriskToken*/ undefined, 
+                    /*name*/ undefined, 
+                    /*typeParameters*/ undefined, [
+                        ts.createParameter(/*decorators*/ undefined, /*modifiers*/ undefined, /*dotDotDotToken*/ undefined, "require"),
+                        ts.createParameter(/*decorators*/ undefined, /*modifiers*/ undefined, /*dotDotDotToken*/ undefined, "exports")
+                    ].concat(importAliasNames), 
+                    /*type*/ undefined, transformAsynchronousModuleBody(node))
                 ]))
-            ]), node.statements));
+            ]), 
+            /*location*/ node.statements));
             ts.addEmitHelpers(updated, context.readEmitHelpers());
             return updated;
         }
+        /**
+         * Collect the additional asynchronous dependencies for the module.
+         *
+         * @param node The source file.
+         * @param includeNonAmdDependencies A value indicating whether to include non-AMD dependencies.
+         */
         function collectAsynchronousDependencies(node, includeNonAmdDependencies) {
+            // names of modules with corresponding parameter in the factory function
             var aliasedModuleNames = [];
+            // names of modules with no corresponding parameters in factory function
             var unaliasedModuleNames = [];
+            // names of the parameters in the factory function; these
+            // parameters need to match the indexes of the corresponding
+            // module names in aliasedModuleNames.
             var importAliasNames = [];
+            // Fill in amd-dependency tags
             for (var _i = 0, _a = node.amdDependencies; _i < _a.length; _i++) {
                 var amdDependency = _a[_i];
                 if (amdDependency.name) {
                     aliasedModuleNames.push(ts.createLiteral(amdDependency.path));
-                    importAliasNames.push(ts.createParameter(undefined, undefined, undefined, amdDependency.name));
+                    importAliasNames.push(ts.createParameter(/*decorators*/ undefined, /*modifiers*/ undefined, /*dotDotDotToken*/ undefined, amdDependency.name));
                 }
                 else {
                     unaliasedModuleNames.push(ts.createLiteral(amdDependency.path));
@@ -55886,13 +71697,20 @@ var ts;
             }
             for (var _b = 0, _c = currentModuleInfo.externalImports; _b < _c.length; _b++) {
                 var importNode = _c[_b];
+                // Find the name of the external module
                 var externalModuleName = ts.getExternalModuleNameLiteral(importNode, currentSourceFile, host, resolver, compilerOptions);
+                // Find the name of the module alias, if there is one
                 var importAliasName = ts.getLocalNameForExternalImport(importNode, currentSourceFile);
+                // It is possible that externalModuleName is undefined if it is not string literal.
+                // This can happen in the invalid import syntax.
+                // E.g : "import * from alias from 'someLib';"
                 if (externalModuleName) {
                     if (includeNonAmdDependencies && importAliasName) {
-                        ts.setEmitFlags(importAliasName, 4);
+                        // Set emitFlags on the name of the classDeclaration
+                        // This is so that when printer will not substitute the identifier
+                        ts.setEmitFlags(importAliasName, 4 /* NoSubstitution */);
                         aliasedModuleNames.push(externalModuleName);
-                        importAliasNames.push(ts.createParameter(undefined, undefined, undefined, importAliasName));
+                        importAliasNames.push(ts.createParameter(/*decorators*/ undefined, /*modifiers*/ undefined, /*dotDotDotToken*/ undefined, importAliasName));
                     }
                     else {
                         unaliasedModuleNames.push(externalModuleName);
@@ -55905,29 +71723,40 @@ var ts;
             if (ts.isImportEqualsDeclaration(node) || ts.isExportDeclaration(node) || !ts.getExternalModuleNameLiteral(node, currentSourceFile, host, resolver, compilerOptions)) {
                 return undefined;
             }
-            var name = ts.getLocalNameForExternalImport(node, currentSourceFile);
+            var name = ts.getLocalNameForExternalImport(node, currentSourceFile); // TODO: GH#18217
             var expr = getHelperExpressionForImport(node, name);
             if (expr === name) {
                 return undefined;
             }
             return ts.createStatement(ts.createAssignment(name, expr));
         }
+        /**
+         * Transforms a SourceFile into an AMD or UMD module body.
+         *
+         * @param node The SourceFile node.
+         */
         function transformAsynchronousModuleBody(node) {
             startLexicalEnvironment();
             var statements = [];
-            var statementOffset = ts.addPrologue(statements, node.statements, !compilerOptions.noImplicitUseStrict, sourceElementVisitor);
+            var statementOffset = ts.addPrologue(statements, node.statements, /*ensureUseStrict*/ !compilerOptions.noImplicitUseStrict, sourceElementVisitor);
             if (shouldEmitUnderscoreUnderscoreESModule()) {
                 ts.append(statements, createUnderscoreUnderscoreESModule());
             }
+            // Visit each statement of the module body.
             ts.append(statements, ts.visitNode(currentModuleInfo.externalHelpersImportDeclaration, sourceElementVisitor, ts.isStatement));
             if (moduleKind === ts.ModuleKind.AMD) {
                 ts.addRange(statements, ts.mapDefined(currentModuleInfo.externalImports, getAMDImportExpressionForImport));
             }
             ts.addRange(statements, ts.visitNodes(node.statements, sourceElementVisitor, ts.isStatement, statementOffset));
-            addExportEqualsIfNeeded(statements, true);
+            // Append the 'export =' statement if provided.
+            addExportEqualsIfNeeded(statements, /*emitAsReturn*/ true);
+            // End the lexical environment for the module body
+            // and merge any new lexical declarations.
             ts.prependStatements(statements, endLexicalEnvironment());
-            var body = ts.createBlock(statements, true);
+            var body = ts.createBlock(statements, /*multiLine*/ true);
             if (currentModuleInfo.hasExportStarsToExportValues && !compilerOptions.importHelpers) {
+                // If we have any `export * from ...` declarations
+                // we need to inform the emitter to add the __export helper.
                 ts.addEmitHelper(body, exportStarHelper);
             }
             if (needUMDDynamicImportHelper) {
@@ -55935,6 +71764,14 @@ var ts;
             }
             return body;
         }
+        /**
+         * Adds the down-level representation of `export=` to the statement list if one exists
+         * in the source file.
+         *
+         * @param statements The Statement list to modify.
+         * @param emitAsReturn A value indicating whether to emit the `export=` statement as a
+         * return statement.
+         */
         function addExportEqualsIfNeeded(statements, emitAsReturn) {
             if (currentModuleInfo.exportEquals) {
                 var expressionResult = ts.visitNode(currentModuleInfo.exportEquals.expression, moduleExpressionElementVisitor);
@@ -55942,50 +71779,60 @@ var ts;
                     if (emitAsReturn) {
                         var statement = ts.createReturn(expressionResult);
                         ts.setTextRange(statement, currentModuleInfo.exportEquals);
-                        ts.setEmitFlags(statement, 384 | 1536);
+                        ts.setEmitFlags(statement, 384 /* NoTokenSourceMaps */ | 1536 /* NoComments */);
                         statements.push(statement);
                     }
                     else {
                         var statement = ts.createStatement(ts.createAssignment(ts.createPropertyAccess(ts.createIdentifier("module"), "exports"), expressionResult));
                         ts.setTextRange(statement, currentModuleInfo.exportEquals);
-                        ts.setEmitFlags(statement, 1536);
+                        ts.setEmitFlags(statement, 1536 /* NoComments */);
                         statements.push(statement);
                     }
                 }
             }
         }
+        //
+        // Top-Level Source Element Visitors
+        //
+        /**
+         * Visits a node at the top level of the source file.
+         *
+         * @param node The node to visit.
+         */
         function sourceElementVisitor(node) {
             switch (node.kind) {
-                case 244:
+                case 244 /* ImportDeclaration */:
                     return visitImportDeclaration(node);
-                case 243:
+                case 243 /* ImportEqualsDeclaration */:
                     return visitImportEqualsDeclaration(node);
-                case 250:
+                case 250 /* ExportDeclaration */:
                     return visitExportDeclaration(node);
-                case 249:
+                case 249 /* ExportAssignment */:
                     return visitExportAssignment(node);
-                case 214:
+                case 214 /* VariableStatement */:
                     return visitVariableStatement(node);
-                case 234:
+                case 234 /* FunctionDeclaration */:
                     return visitFunctionDeclaration(node);
-                case 235:
+                case 235 /* ClassDeclaration */:
                     return visitClassDeclaration(node);
-                case 303:
+                case 303 /* MergeDeclarationMarker */:
                     return visitMergeDeclarationMarker(node);
-                case 304:
+                case 304 /* EndOfDeclarationMarker */:
                     return visitEndOfDeclarationMarker(node);
                 default:
                     return ts.visitEachChild(node, moduleExpressionElementVisitor, context);
             }
         }
         function moduleExpressionElementVisitor(node) {
-            if (!(node.transformFlags & 67108864) && !(node.transformFlags & 2048)) {
+            // This visitor does not need to descend into the tree if there is no dynamic import or destructuring assignment,
+            // as export/import statements are only transformed at the top level of a file.
+            if (!(node.transformFlags & 67108864 /* ContainsDynamicImport */) && !(node.transformFlags & 2048 /* ContainsDestructuringAssignment */)) {
                 return node;
             }
             if (ts.isImportCall(node)) {
                 return visitImportCallExpression(node);
             }
-            else if (node.transformFlags & 1024 && ts.isBinaryExpression(node)) {
+            else if (node.transformFlags & 1024 /* DestructuringAssignment */ && ts.isBinaryExpression(node)) {
                 return visitDestructuringAssignment(node);
             }
             else {
@@ -55997,24 +71844,24 @@ var ts;
                 for (var _i = 0, _a = node.properties; _i < _a.length; _i++) {
                     var elem = _a[_i];
                     switch (elem.kind) {
-                        case 270:
+                        case 270 /* PropertyAssignment */:
                             if (destructuringNeedsFlattening(elem.initializer)) {
                                 return true;
                             }
                             break;
-                        case 271:
+                        case 271 /* ShorthandPropertyAssignment */:
                             if (destructuringNeedsFlattening(elem.name)) {
                                 return true;
                             }
                             break;
-                        case 272:
+                        case 272 /* SpreadAssignment */:
                             if (destructuringNeedsFlattening(elem.expression)) {
                                 return true;
                             }
                             break;
-                        case 154:
-                        case 156:
-                        case 157:
+                        case 154 /* MethodDeclaration */:
+                        case 156 /* GetAccessor */:
+                        case 157 /* SetAccessor */:
                             return false;
                         default: ts.Debug.assertNever(elem, "Unhandled object member kind");
                     }
@@ -56040,13 +71887,13 @@ var ts;
         }
         function visitDestructuringAssignment(node) {
             if (destructuringNeedsFlattening(node.left)) {
-                return ts.flattenDestructuringAssignment(node, moduleExpressionElementVisitor, context, 0, false, createAllExportExpressions);
+                return ts.flattenDestructuringAssignment(node, moduleExpressionElementVisitor, context, 0 /* All */, /*needsValue*/ false, createAllExportExpressions);
             }
             return ts.visitEachChild(node, moduleExpressionElementVisitor, context);
         }
         function visitImportCallExpression(node) {
             var argument = ts.visitNode(ts.firstOrUndefined(node.arguments), moduleExpressionElementVisitor);
-            var containsLexicalThis = !!(node.transformFlags & 16384);
+            var containsLexicalThis = !!(node.transformFlags & 16384 /* ContainsLexicalThis */);
             switch (compilerOptions.module) {
                 case ts.ModuleKind.AMD:
                     return createImportCallExpressionAMD(argument, containsLexicalThis);
@@ -56058,103 +71905,181 @@ var ts;
             }
         }
         function createImportCallExpressionUMD(arg, containsLexicalThis) {
+            // (function (factory) {
+            //      ... (regular UMD)
+            // }
+            // })(function (require, exports, useSyncRequire) {
+            //      "use strict";
+            //      Object.defineProperty(exports, "__esModule", { value: true });
+            //      var __syncRequire = typeof module === "object" && typeof module.exports === "object";
+            //      var __resolved = new Promise(function (resolve) { resolve(); });
+            //      .....
+            //      __syncRequire
+            //          ? __resolved.then(function () { return require(x); }) /*CommonJs Require*/
+            //          : new Promise(function (_a, _b) { require([x], _a, _b); }); /*Amd Require*/
+            // });
             needUMDDynamicImportHelper = true;
             if (ts.isSimpleCopiableExpression(arg)) {
-                var argClone = ts.isGeneratedIdentifier(arg) ? arg : ts.isStringLiteral(arg) ? ts.createLiteral(arg) : ts.setEmitFlags(ts.setTextRange(ts.getSynthesizedClone(arg), arg), 1536);
-                return ts.createConditional(ts.createIdentifier("__syncRequire"), createImportCallExpressionCommonJS(arg, containsLexicalThis), createImportCallExpressionAMD(argClone, containsLexicalThis));
+                var argClone = ts.isGeneratedIdentifier(arg) ? arg : ts.isStringLiteral(arg) ? ts.createLiteral(arg) : ts.setEmitFlags(ts.setTextRange(ts.getSynthesizedClone(arg), arg), 1536 /* NoComments */);
+                return ts.createConditional(
+                /*condition*/ ts.createIdentifier("__syncRequire"), 
+                /*whenTrue*/ createImportCallExpressionCommonJS(arg, containsLexicalThis), 
+                /*whenFalse*/ createImportCallExpressionAMD(argClone, containsLexicalThis));
             }
             else {
                 var temp = ts.createTempVariable(hoistVariableDeclaration);
-                return ts.createComma(ts.createAssignment(temp, arg), ts.createConditional(ts.createIdentifier("__syncRequire"), createImportCallExpressionCommonJS(temp, containsLexicalThis), createImportCallExpressionAMD(temp, containsLexicalThis)));
+                return ts.createComma(ts.createAssignment(temp, arg), ts.createConditional(
+                /*condition*/ ts.createIdentifier("__syncRequire"), 
+                /*whenTrue*/ createImportCallExpressionCommonJS(temp, containsLexicalThis), 
+                /*whenFalse*/ createImportCallExpressionAMD(temp, containsLexicalThis)));
             }
         }
         function createImportCallExpressionAMD(arg, containsLexicalThis) {
+            // improt("./blah")
+            // emit as
+            // define(["require", "exports", "blah"], function (require, exports) {
+            //     ...
+            //     new Promise(function (_a, _b) { require([x], _a, _b); }); /*Amd Require*/
+            // });
             var resolve = ts.createUniqueName("resolve");
             var reject = ts.createUniqueName("reject");
             var parameters = [
-                ts.createParameter(undefined, undefined, undefined, resolve),
-                ts.createParameter(undefined, undefined, undefined, reject)
+                ts.createParameter(/*decorator*/ undefined, /*modifiers*/ undefined, /*dotDotDotToken*/ undefined, /*name*/ resolve),
+                ts.createParameter(/*decorator*/ undefined, /*modifiers*/ undefined, /*dotDotDotToken*/ undefined, /*name*/ reject)
             ];
             var body = ts.createBlock([
-                ts.createStatement(ts.createCall(ts.createIdentifier("require"), undefined, [ts.createArrayLiteral([arg || ts.createOmittedExpression()]), resolve, reject]))
+                ts.createStatement(ts.createCall(ts.createIdentifier("require"), 
+                /*typeArguments*/ undefined, [ts.createArrayLiteral([arg || ts.createOmittedExpression()]), resolve, reject]))
             ]);
             var func;
-            if (languageVersion >= 2) {
-                func = ts.createArrowFunction(undefined, undefined, parameters, undefined, undefined, body);
+            if (languageVersion >= 2 /* ES2015 */) {
+                func = ts.createArrowFunction(
+                /*modifiers*/ undefined, 
+                /*typeParameters*/ undefined, parameters, 
+                /*type*/ undefined, 
+                /*equalsGreaterThanToken*/ undefined, body);
             }
             else {
-                func = ts.createFunctionExpression(undefined, undefined, undefined, undefined, parameters, undefined, body);
+                func = ts.createFunctionExpression(
+                /*modifiers*/ undefined, 
+                /*asteriskToken*/ undefined, 
+                /*name*/ undefined, 
+                /*typeParameters*/ undefined, parameters, 
+                /*type*/ undefined, body);
+                // if there is a lexical 'this' in the import call arguments, ensure we indicate
+                // that this new function expression indicates it captures 'this' so that the
+                // es2015 transformer will properly substitute 'this' with '_this'.
                 if (containsLexicalThis) {
-                    ts.setEmitFlags(func, 8);
+                    ts.setEmitFlags(func, 8 /* CapturesThis */);
                 }
             }
-            var promise = ts.createNew(ts.createIdentifier("Promise"), undefined, [func]);
+            var promise = ts.createNew(ts.createIdentifier("Promise"), /*typeArguments*/ undefined, [func]);
             if (compilerOptions.esModuleInterop) {
                 context.requestEmitHelper(importStarHelper);
-                return ts.createCall(ts.createPropertyAccess(promise, ts.createIdentifier("then")), undefined, [ts.getHelperName("__importStar")]);
+                return ts.createCall(ts.createPropertyAccess(promise, ts.createIdentifier("then")), /*typeArguments*/ undefined, [ts.getHelperName("__importStar")]);
             }
             return promise;
         }
         function createImportCallExpressionCommonJS(arg, containsLexicalThis) {
-            var promiseResolveCall = ts.createCall(ts.createPropertyAccess(ts.createIdentifier("Promise"), "resolve"), undefined, []);
-            var requireCall = ts.createCall(ts.createIdentifier("require"), undefined, arg ? [arg] : []);
+            // import("./blah")
+            // emit as
+            // Promise.resolve().then(function () { return require(x); }) /*CommonJs Require*/
+            // We have to wrap require in then callback so that require is done in asynchronously
+            // if we simply do require in resolve callback in Promise constructor. We will execute the loading immediately
+            var promiseResolveCall = ts.createCall(ts.createPropertyAccess(ts.createIdentifier("Promise"), "resolve"), /*typeArguments*/ undefined, /*argumentsArray*/ []);
+            var requireCall = ts.createCall(ts.createIdentifier("require"), /*typeArguments*/ undefined, arg ? [arg] : []);
             if (compilerOptions.esModuleInterop) {
                 context.requestEmitHelper(importStarHelper);
-                requireCall = ts.createCall(ts.getHelperName("__importStar"), undefined, [requireCall]);
+                requireCall = ts.createCall(ts.getHelperName("__importStar"), /*typeArguments*/ undefined, [requireCall]);
             }
             var func;
-            if (languageVersion >= 2) {
-                func = ts.createArrowFunction(undefined, undefined, [], undefined, undefined, requireCall);
+            if (languageVersion >= 2 /* ES2015 */) {
+                func = ts.createArrowFunction(
+                /*modifiers*/ undefined, 
+                /*typeParameters*/ undefined, 
+                /*parameters*/ [], 
+                /*type*/ undefined, 
+                /*equalsGreaterThanToken*/ undefined, requireCall);
             }
             else {
-                func = ts.createFunctionExpression(undefined, undefined, undefined, undefined, [], undefined, ts.createBlock([ts.createReturn(requireCall)]));
+                func = ts.createFunctionExpression(
+                /*modifiers*/ undefined, 
+                /*asteriskToken*/ undefined, 
+                /*name*/ undefined, 
+                /*typeParameters*/ undefined, 
+                /*parameters*/ [], 
+                /*type*/ undefined, ts.createBlock([ts.createReturn(requireCall)]));
+                // if there is a lexical 'this' in the import call arguments, ensure we indicate
+                // that this new function expression indicates it captures 'this' so that the
+                // es2015 transformer will properly substitute 'this' with '_this'.
                 if (containsLexicalThis) {
-                    ts.setEmitFlags(func, 8);
+                    ts.setEmitFlags(func, 8 /* CapturesThis */);
                 }
             }
-            return ts.createCall(ts.createPropertyAccess(promiseResolveCall, "then"), undefined, [func]);
+            return ts.createCall(ts.createPropertyAccess(promiseResolveCall, "then"), /*typeArguments*/ undefined, [func]);
         }
         function getHelperExpressionForImport(node, innerExpr) {
-            if (!compilerOptions.esModuleInterop || ts.getEmitFlags(node) & 67108864) {
+            if (!compilerOptions.esModuleInterop || ts.getEmitFlags(node) & 67108864 /* NeverApplyImportHelper */) {
                 return innerExpr;
             }
             if (ts.getImportNeedsImportStarHelper(node)) {
                 context.requestEmitHelper(importStarHelper);
-                return ts.createCall(ts.getHelperName("__importStar"), undefined, [innerExpr]);
+                return ts.createCall(ts.getHelperName("__importStar"), /*typeArguments*/ undefined, [innerExpr]);
             }
             if (ts.getImportNeedsImportDefaultHelper(node)) {
                 context.requestEmitHelper(importDefaultHelper);
-                return ts.createCall(ts.getHelperName("__importDefault"), undefined, [innerExpr]);
+                return ts.createCall(ts.getHelperName("__importDefault"), /*typeArguments*/ undefined, [innerExpr]);
             }
             return innerExpr;
         }
+        /**
+         * Visits an ImportDeclaration node.
+         *
+         * @param node The node to visit.
+         */
         function visitImportDeclaration(node) {
             var statements;
             var namespaceDeclaration = ts.getNamespaceDeclarationNode(node);
             if (moduleKind !== ts.ModuleKind.AMD) {
                 if (!node.importClause) {
+                    // import "mod";
                     return ts.setTextRange(ts.createStatement(createRequireCall(node)), node);
                 }
                 else {
                     var variables = [];
                     if (namespaceDeclaration && !ts.isDefaultImport(node)) {
-                        variables.push(ts.createVariableDeclaration(ts.getSynthesizedClone(namespaceDeclaration.name), undefined, getHelperExpressionForImport(node, createRequireCall(node))));
+                        // import * as n from "mod";
+                        variables.push(ts.createVariableDeclaration(ts.getSynthesizedClone(namespaceDeclaration.name), 
+                        /*type*/ undefined, getHelperExpressionForImport(node, createRequireCall(node))));
                     }
                     else {
-                        variables.push(ts.createVariableDeclaration(ts.getGeneratedNameForNode(node), undefined, getHelperExpressionForImport(node, createRequireCall(node))));
+                        // import d from "mod";
+                        // import { x, y } from "mod";
+                        // import d, { x, y } from "mod";
+                        // import d, * as n from "mod";
+                        variables.push(ts.createVariableDeclaration(ts.getGeneratedNameForNode(node), 
+                        /*type*/ undefined, getHelperExpressionForImport(node, createRequireCall(node))));
                         if (namespaceDeclaration && ts.isDefaultImport(node)) {
-                            variables.push(ts.createVariableDeclaration(ts.getSynthesizedClone(namespaceDeclaration.name), undefined, ts.getGeneratedNameForNode(node)));
+                            variables.push(ts.createVariableDeclaration(ts.getSynthesizedClone(namespaceDeclaration.name), 
+                            /*type*/ undefined, ts.getGeneratedNameForNode(node)));
                         }
                     }
-                    statements = ts.append(statements, ts.setTextRange(ts.createVariableStatement(undefined, ts.createVariableDeclarationList(variables, languageVersion >= 2 ? 2 : 0)), node));
+                    statements = ts.append(statements, ts.setTextRange(ts.createVariableStatement(
+                    /*modifiers*/ undefined, ts.createVariableDeclarationList(variables, languageVersion >= 2 /* ES2015 */ ? 2 /* Const */ : 0 /* None */)), 
+                    /*location*/ node));
                 }
             }
             else if (namespaceDeclaration && ts.isDefaultImport(node)) {
-                statements = ts.append(statements, ts.createVariableStatement(undefined, ts.createVariableDeclarationList([
-                    ts.setTextRange(ts.createVariableDeclaration(ts.getSynthesizedClone(namespaceDeclaration.name), undefined, ts.getGeneratedNameForNode(node)), node)
-                ], languageVersion >= 2 ? 2 : 0)));
+                // import d, * as n from "mod";
+                statements = ts.append(statements, ts.createVariableStatement(
+                /*modifiers*/ undefined, ts.createVariableDeclarationList([
+                    ts.setTextRange(ts.createVariableDeclaration(ts.getSynthesizedClone(namespaceDeclaration.name), 
+                    /*type*/ undefined, ts.getGeneratedNameForNode(node)), 
+                    /*location*/ node)
+                ], languageVersion >= 2 /* ES2015 */ ? 2 /* Const */ : 0 /* None */)));
             }
             if (hasAssociatedEndOfDeclarationMarker(node)) {
+                // Defer exports until we encounter an EndOfDeclarationMarker node
                 var id = ts.getOriginalNodeId(node);
                 deferredExports[id] = appendExportsOfImportDeclaration(deferredExports[id], node);
             }
@@ -56163,33 +72088,47 @@ var ts;
             }
             return ts.singleOrMany(statements);
         }
+        /**
+         * Creates a `require()` call to import an external module.
+         *
+         * @param importNode The declararation to import.
+         */
         function createRequireCall(importNode) {
             var moduleName = ts.getExternalModuleNameLiteral(importNode, currentSourceFile, host, resolver, compilerOptions);
             var args = [];
             if (moduleName) {
                 args.push(moduleName);
             }
-            return ts.createCall(ts.createIdentifier("require"), undefined, args);
+            return ts.createCall(ts.createIdentifier("require"), /*typeArguments*/ undefined, args);
         }
+        /**
+         * Visits an ImportEqualsDeclaration node.
+         *
+         * @param node The node to visit.
+         */
         function visitImportEqualsDeclaration(node) {
             ts.Debug.assert(ts.isExternalModuleImportEqualsDeclaration(node), "import= for internal module references should be handled in an earlier transformer.");
             var statements;
             if (moduleKind !== ts.ModuleKind.AMD) {
-                if (ts.hasModifier(node, 1)) {
+                if (ts.hasModifier(node, 1 /* Export */)) {
                     statements = ts.append(statements, ts.setTextRange(ts.createStatement(createExportExpression(node.name, createRequireCall(node))), node));
                 }
                 else {
-                    statements = ts.append(statements, ts.setTextRange(ts.createVariableStatement(undefined, ts.createVariableDeclarationList([
-                        ts.createVariableDeclaration(ts.getSynthesizedClone(node.name), undefined, createRequireCall(node))
-                    ], languageVersion >= 2 ? 2 : 0)), node));
+                    statements = ts.append(statements, ts.setTextRange(ts.createVariableStatement(
+                    /*modifiers*/ undefined, ts.createVariableDeclarationList([
+                        ts.createVariableDeclaration(ts.getSynthesizedClone(node.name), 
+                        /*type*/ undefined, createRequireCall(node))
+                    ], 
+                    /*flags*/ languageVersion >= 2 /* ES2015 */ ? 2 /* Const */ : 0 /* None */)), node));
                 }
             }
             else {
-                if (ts.hasModifier(node, 1)) {
+                if (ts.hasModifier(node, 1 /* Export */)) {
                     statements = ts.append(statements, ts.setTextRange(ts.createStatement(createExportExpression(ts.getExportName(node), ts.getLocalName(node))), node));
                 }
             }
             if (hasAssociatedEndOfDeclarationMarker(node)) {
+                // Defer exports until we encounter an EndOfDeclarationMarker node
                 var id = ts.getOriginalNodeId(node);
                 deferredExports[id] = appendExportsOfImportEqualsDeclaration(deferredExports[id], node);
             }
@@ -56198,17 +72137,28 @@ var ts;
             }
             return ts.singleOrMany(statements);
         }
+        /**
+         * Visits an ExportDeclaration node.
+         *
+         * @param The node to visit.
+         */
         function visitExportDeclaration(node) {
             if (!node.moduleSpecifier) {
+                // Elide export declarations with no module specifier as they are handled
+                // elsewhere.
                 return undefined;
             }
             var generatedName = ts.getGeneratedNameForNode(node);
             if (node.exportClause) {
                 var statements = [];
+                // export { x, y } from "mod";
                 if (moduleKind !== ts.ModuleKind.AMD) {
-                    statements.push(ts.setTextRange(ts.createVariableStatement(undefined, ts.createVariableDeclarationList([
-                        ts.createVariableDeclaration(generatedName, undefined, createRequireCall(node))
-                    ])), node));
+                    statements.push(ts.setTextRange(ts.createVariableStatement(
+                    /*modifiers*/ undefined, ts.createVariableDeclarationList([
+                        ts.createVariableDeclaration(generatedName, 
+                        /*type*/ undefined, createRequireCall(node))
+                    ])), 
+                    /*location*/ node));
                 }
                 for (var _i = 0, _a = node.exportClause.elements; _i < _a.length; _i++) {
                     var specifier = _a[_i];
@@ -56218,9 +72168,15 @@ var ts;
                 return ts.singleOrMany(statements);
             }
             else {
+                // export * from "mod";
                 return ts.setTextRange(ts.createStatement(createExportStarHelper(context, moduleKind !== ts.ModuleKind.AMD ? createRequireCall(node) : generatedName)), node);
             }
         }
+        /**
+         * Visits an ExportAssignment node.
+         *
+         * @param node The node to visit.
+         */
         function visitExportAssignment(node) {
             if (node.isExportEquals) {
                 return undefined;
@@ -56228,23 +72184,35 @@ var ts;
             var statements;
             var original = node.original;
             if (original && hasAssociatedEndOfDeclarationMarker(original)) {
+                // Defer exports until we encounter an EndOfDeclarationMarker node
                 var id = ts.getOriginalNodeId(node);
-                deferredExports[id] = appendExportStatement(deferredExports[id], ts.createIdentifier("default"), ts.visitNode(node.expression, moduleExpressionElementVisitor), node, true);
+                deferredExports[id] = appendExportStatement(deferredExports[id], ts.createIdentifier("default"), ts.visitNode(node.expression, moduleExpressionElementVisitor), /*location*/ node, /*allowComments*/ true);
             }
             else {
-                statements = appendExportStatement(statements, ts.createIdentifier("default"), ts.visitNode(node.expression, moduleExpressionElementVisitor), node, true);
+                statements = appendExportStatement(statements, ts.createIdentifier("default"), ts.visitNode(node.expression, moduleExpressionElementVisitor), /*location*/ node, /*allowComments*/ true);
             }
             return ts.singleOrMany(statements);
         }
+        /**
+         * Visits a FunctionDeclaration node.
+         *
+         * @param node The node to visit.
+         */
         function visitFunctionDeclaration(node) {
             var statements;
-            if (ts.hasModifier(node, 1)) {
-                statements = ts.append(statements, ts.setOriginalNode(ts.setTextRange(ts.createFunctionDeclaration(undefined, ts.visitNodes(node.modifiers, modifierVisitor, ts.isModifier), node.asteriskToken, ts.getDeclarationName(node, true, true), undefined, ts.visitNodes(node.parameters, moduleExpressionElementVisitor), undefined, ts.visitEachChild(node.body, moduleExpressionElementVisitor, context)), node), node));
+            if (ts.hasModifier(node, 1 /* Export */)) {
+                statements = ts.append(statements, ts.setOriginalNode(ts.setTextRange(ts.createFunctionDeclaration(
+                /*decorators*/ undefined, ts.visitNodes(node.modifiers, modifierVisitor, ts.isModifier), node.asteriskToken, ts.getDeclarationName(node, /*allowComments*/ true, /*allowSourceMaps*/ true), 
+                /*typeParameters*/ undefined, ts.visitNodes(node.parameters, moduleExpressionElementVisitor), 
+                /*type*/ undefined, ts.visitEachChild(node.body, moduleExpressionElementVisitor, context)), 
+                /*location*/ node), 
+                /*original*/ node));
             }
             else {
                 statements = ts.append(statements, ts.visitEachChild(node, moduleExpressionElementVisitor, context));
             }
             if (hasAssociatedEndOfDeclarationMarker(node)) {
+                // Defer exports until we encounter an EndOfDeclarationMarker node
                 var id = ts.getOriginalNodeId(node);
                 deferredExports[id] = appendExportsOfHoistedDeclaration(deferredExports[id], node);
             }
@@ -56253,15 +72221,23 @@ var ts;
             }
             return ts.singleOrMany(statements);
         }
+        /**
+         * Visits a ClassDeclaration node.
+         *
+         * @param node The node to visit.
+         */
         function visitClassDeclaration(node) {
             var statements;
-            if (ts.hasModifier(node, 1)) {
-                statements = ts.append(statements, ts.setOriginalNode(ts.setTextRange(ts.createClassDeclaration(undefined, ts.visitNodes(node.modifiers, modifierVisitor, ts.isModifier), ts.getDeclarationName(node, true, true), undefined, ts.visitNodes(node.heritageClauses, moduleExpressionElementVisitor), ts.visitNodes(node.members, moduleExpressionElementVisitor)), node), node));
+            if (ts.hasModifier(node, 1 /* Export */)) {
+                statements = ts.append(statements, ts.setOriginalNode(ts.setTextRange(ts.createClassDeclaration(
+                /*decorators*/ undefined, ts.visitNodes(node.modifiers, modifierVisitor, ts.isModifier), ts.getDeclarationName(node, /*allowComments*/ true, /*allowSourceMaps*/ true), 
+                /*typeParameters*/ undefined, ts.visitNodes(node.heritageClauses, moduleExpressionElementVisitor), ts.visitNodes(node.members, moduleExpressionElementVisitor)), node), node));
             }
             else {
                 statements = ts.append(statements, ts.visitEachChild(node, moduleExpressionElementVisitor, context));
             }
             if (hasAssociatedEndOfDeclarationMarker(node)) {
+                // Defer exports until we encounter an EndOfDeclarationMarker node
                 var id = ts.getOriginalNodeId(node);
                 deferredExports[id] = appendExportsOfHoistedDeclaration(deferredExports[id], node);
             }
@@ -56270,12 +72246,19 @@ var ts;
             }
             return ts.singleOrMany(statements);
         }
+        /**
+         * Visits a VariableStatement node.
+         *
+         * @param node The node to visit.
+         */
         function visitVariableStatement(node) {
             var statements;
             var variables;
             var expressions;
-            if (ts.hasModifier(node, 1)) {
+            if (ts.hasModifier(node, 1 /* Export */)) {
                 var modifiers = void 0;
+                // If we're exporting these variables, then these just become assignments to 'exports.x'.
+                // We only want to emit assignments for variables with initializers.
                 for (var _i = 0, _a = node.declarationList.declarations; _i < _a.length; _i++) {
                     var variable = _a[_i];
                     if (ts.isIdentifier(variable.name) && ts.isLocalName(variable.name)) {
@@ -56299,6 +72282,7 @@ var ts;
                 statements = ts.append(statements, ts.visitEachChild(node, moduleExpressionElementVisitor, context));
             }
             if (hasAssociatedEndOfDeclarationMarker(node)) {
+                // Defer exports until we encounter an EndOfDeclarationMarker node
                 var id = ts.getOriginalNodeId(node);
                 deferredExports[id] = appendExportsOfVariableStatement(deferredExports[id], node);
             }
@@ -56310,35 +72294,72 @@ var ts;
         function createAllExportExpressions(name, value, location) {
             var exportedNames = getExports(name);
             if (exportedNames) {
+                // For each additional export of the declaration, apply an export assignment.
                 var expression = ts.isExportName(name) ? value : ts.createAssignment(name, value);
                 for (var _i = 0, exportedNames_1 = exportedNames; _i < exportedNames_1.length; _i++) {
                     var exportName = exportedNames_1[_i];
-                    ts.setEmitFlags(expression, 4);
-                    expression = createExportExpression(exportName, expression, location);
+                    // Mark the node to prevent triggering substitution.
+                    ts.setEmitFlags(expression, 4 /* NoSubstitution */);
+                    expression = createExportExpression(exportName, expression, /*location*/ location);
                 }
                 return expression;
             }
             return ts.createAssignment(name, value);
         }
+        /**
+         * Transforms an exported variable with an initializer into an expression.
+         *
+         * @param node The node to transform.
+         */
         function transformInitializedVariable(node) {
             if (ts.isBindingPattern(node.name)) {
-                return ts.flattenDestructuringAssignment(ts.visitNode(node, moduleExpressionElementVisitor), undefined, context, 0, false, createAllExportExpressions);
+                return ts.flattenDestructuringAssignment(ts.visitNode(node, moduleExpressionElementVisitor), 
+                /*visitor*/ undefined, context, 0 /* All */, 
+                /*needsValue*/ false, createAllExportExpressions);
             }
             else {
-                return ts.createAssignment(ts.setTextRange(ts.createPropertyAccess(ts.createIdentifier("exports"), node.name), node.name), ts.visitNode(node.initializer, moduleExpressionElementVisitor));
+                return ts.createAssignment(ts.setTextRange(ts.createPropertyAccess(ts.createIdentifier("exports"), node.name), 
+                /*location*/ node.name), ts.visitNode(node.initializer, moduleExpressionElementVisitor));
             }
         }
+        /**
+         * Visits a MergeDeclarationMarker used as a placeholder for the beginning of a merged
+         * and transformed declaration.
+         *
+         * @param node The node to visit.
+         */
         function visitMergeDeclarationMarker(node) {
-            if (hasAssociatedEndOfDeclarationMarker(node) && node.original.kind === 214) {
+            // For an EnumDeclaration or ModuleDeclaration that merges with a preceeding
+            // declaration we do not emit a leading variable declaration. To preserve the
+            // begin/end semantics of the declararation and to properly handle exports
+            // we wrapped the leading variable declaration in a `MergeDeclarationMarker`.
+            //
+            // To balance the declaration, add the exports of the elided variable
+            // statement.
+            if (hasAssociatedEndOfDeclarationMarker(node) && node.original.kind === 214 /* VariableStatement */) {
                 var id = ts.getOriginalNodeId(node);
                 deferredExports[id] = appendExportsOfVariableStatement(deferredExports[id], node.original);
             }
             return node;
         }
+        /**
+         * Determines whether a node has an associated EndOfDeclarationMarker.
+         *
+         * @param node The node to test.
+         */
         function hasAssociatedEndOfDeclarationMarker(node) {
-            return (ts.getEmitFlags(node) & 4194304) !== 0;
+            return (ts.getEmitFlags(node) & 4194304 /* HasEndOfDeclarationMarker */) !== 0;
         }
+        /**
+         * Visits a DeclarationMarker used as a placeholder for the end of a transformed
+         * declaration.
+         *
+         * @param node The node to visit.
+         */
         function visitEndOfDeclarationMarker(node) {
+            // For some transformations we emit an `EndOfDeclarationMarker` to mark the actual
+            // end of the transformed declaration. We use this marker to emit any deferred exports
+            // of the declaration.
             var id = ts.getOriginalNodeId(node);
             var statements = deferredExports[id];
             if (statements) {
@@ -56347,6 +72368,15 @@ var ts;
             }
             return node;
         }
+        /**
+         * Appends the exports of an ImportDeclaration to a statement list, returning the
+         * statement list.
+         *
+         * @param statements A statement list to which the down-level export statements are to be
+         * appended. If `statements` is `undefined`, a new array is allocated if statements are
+         * appended.
+         * @param decl The declaration whose exports are to be recorded.
+         */
         function appendExportsOfImportDeclaration(statements, decl) {
             if (currentModuleInfo.exportEquals) {
                 return statements;
@@ -56361,10 +72391,10 @@ var ts;
             var namedBindings = importClause.namedBindings;
             if (namedBindings) {
                 switch (namedBindings.kind) {
-                    case 246:
+                    case 246 /* NamespaceImport */:
                         statements = appendExportsOfDeclaration(statements, namedBindings);
                         break;
-                    case 247:
+                    case 247 /* NamedImports */:
                         for (var _i = 0, _a = namedBindings.elements; _i < _a.length; _i++) {
                             var importBinding = _a[_i];
                             statements = appendExportsOfDeclaration(statements, importBinding);
@@ -56374,12 +72404,30 @@ var ts;
             }
             return statements;
         }
+        /**
+         * Appends the exports of an ImportEqualsDeclaration to a statement list, returning the
+         * statement list.
+         *
+         * @param statements A statement list to which the down-level export statements are to be
+         * appended. If `statements` is `undefined`, a new array is allocated if statements are
+         * appended.
+         * @param decl The declaration whose exports are to be recorded.
+         */
         function appendExportsOfImportEqualsDeclaration(statements, decl) {
             if (currentModuleInfo.exportEquals) {
                 return statements;
             }
             return appendExportsOfDeclaration(statements, decl);
         }
+        /**
+         * Appends the exports of a VariableStatement to a statement list, returning the statement
+         * list.
+         *
+         * @param statements A statement list to which the down-level export statements are to be
+         * appended. If `statements` is `undefined`, a new array is allocated if statements are
+         * appended.
+         * @param node The VariableStatement whose exports are to be recorded.
+         */
         function appendExportsOfVariableStatement(statements, node) {
             if (currentModuleInfo.exportEquals) {
                 return statements;
@@ -56390,6 +72438,15 @@ var ts;
             }
             return statements;
         }
+        /**
+         * Appends the exports of a VariableDeclaration or BindingElement to a statement list,
+         * returning the statement list.
+         *
+         * @param statements A statement list to which the down-level export statements are to be
+         * appended. If `statements` is `undefined`, a new array is allocated if statements are
+         * appended.
+         * @param decl The declaration whose exports are to be recorded.
+         */
         function appendExportsOfBindingElement(statements, decl) {
             if (currentModuleInfo.exportEquals) {
                 return statements;
@@ -56407,72 +72464,136 @@ var ts;
             }
             return statements;
         }
+        /**
+         * Appends the exports of a ClassDeclaration or FunctionDeclaration to a statement list,
+         * returning the statement list.
+         *
+         * @param statements A statement list to which the down-level export statements are to be
+         * appended. If `statements` is `undefined`, a new array is allocated if statements are
+         * appended.
+         * @param decl The declaration whose exports are to be recorded.
+         */
         function appendExportsOfHoistedDeclaration(statements, decl) {
             if (currentModuleInfo.exportEquals) {
                 return statements;
             }
-            if (ts.hasModifier(decl, 1)) {
-                var exportName = ts.hasModifier(decl, 512) ? ts.createIdentifier("default") : ts.getDeclarationName(decl);
-                statements = appendExportStatement(statements, exportName, ts.getLocalName(decl), decl);
+            if (ts.hasModifier(decl, 1 /* Export */)) {
+                var exportName = ts.hasModifier(decl, 512 /* Default */) ? ts.createIdentifier("default") : ts.getDeclarationName(decl);
+                statements = appendExportStatement(statements, exportName, ts.getLocalName(decl), /*location*/ decl);
             }
             if (decl.name) {
                 statements = appendExportsOfDeclaration(statements, decl);
             }
             return statements;
         }
+        /**
+         * Appends the exports of a declaration to a statement list, returning the statement list.
+         *
+         * @param statements A statement list to which the down-level export statements are to be
+         * appended. If `statements` is `undefined`, a new array is allocated if statements are
+         * appended.
+         * @param decl The declaration to export.
+         */
         function appendExportsOfDeclaration(statements, decl) {
             var name = ts.getDeclarationName(decl);
             var exportSpecifiers = currentModuleInfo.exportSpecifiers.get(ts.idText(name));
             if (exportSpecifiers) {
                 for (var _i = 0, exportSpecifiers_1 = exportSpecifiers; _i < exportSpecifiers_1.length; _i++) {
                     var exportSpecifier = exportSpecifiers_1[_i];
-                    statements = appendExportStatement(statements, exportSpecifier.name, name, exportSpecifier.name);
+                    statements = appendExportStatement(statements, exportSpecifier.name, name, /*location*/ exportSpecifier.name);
                 }
             }
             return statements;
         }
+        /**
+         * Appends the down-level representation of an export to a statement list, returning the
+         * statement list.
+         *
+         * @param statements A statement list to which the down-level export statements are to be
+         * appended. If `statements` is `undefined`, a new array is allocated if statements are
+         * appended.
+         * @param exportName The name of the export.
+         * @param expression The expression to export.
+         * @param location The location to use for source maps and comments for the export.
+         * @param allowComments Whether to allow comments on the export.
+         */
         function appendExportStatement(statements, exportName, expression, location, allowComments) {
             statements = ts.append(statements, createExportStatement(exportName, expression, location, allowComments));
             return statements;
         }
         function createUnderscoreUnderscoreESModule() {
             var statement;
-            if (languageVersion === 0) {
-                statement = ts.createStatement(createExportExpression(ts.createIdentifier("__esModule"), ts.createLiteral(true)));
+            if (languageVersion === 0 /* ES3 */) {
+                statement = ts.createStatement(createExportExpression(ts.createIdentifier("__esModule"), ts.createLiteral(/*value*/ true)));
             }
             else {
-                statement = ts.createStatement(ts.createCall(ts.createPropertyAccess(ts.createIdentifier("Object"), "defineProperty"), undefined, [
+                statement = ts.createStatement(ts.createCall(ts.createPropertyAccess(ts.createIdentifier("Object"), "defineProperty"), 
+                /*typeArguments*/ undefined, [
                     ts.createIdentifier("exports"),
                     ts.createLiteral("__esModule"),
                     ts.createObjectLiteral([
-                        ts.createPropertyAssignment("value", ts.createLiteral(true))
+                        ts.createPropertyAssignment("value", ts.createLiteral(/*value*/ true))
                     ])
                 ]));
             }
-            ts.setEmitFlags(statement, 1048576);
+            ts.setEmitFlags(statement, 1048576 /* CustomPrologue */);
             return statement;
         }
+        /**
+         * Creates a call to the current file's export function to export a value.
+         *
+         * @param name The bound name of the export.
+         * @param value The exported value.
+         * @param location The location to use for source maps and comments for the export.
+         * @param allowComments An optional value indicating whether to emit comments for the statement.
+         */
         function createExportStatement(name, value, location, allowComments) {
             var statement = ts.setTextRange(ts.createStatement(createExportExpression(name, value)), location);
             ts.startOnNewLine(statement);
             if (!allowComments) {
-                ts.setEmitFlags(statement, 1536);
+                ts.setEmitFlags(statement, 1536 /* NoComments */);
             }
             return statement;
         }
+        /**
+         * Creates a call to the current file's export function to export a value.
+         *
+         * @param name The bound name of the export.
+         * @param value The exported value.
+         * @param location The location to use for source maps and comments for the export.
+         */
         function createExportExpression(name, value, location) {
             return ts.setTextRange(ts.createAssignment(ts.createPropertyAccess(ts.createIdentifier("exports"), ts.getSynthesizedClone(name)), value), location);
         }
+        //
+        // Modifier Visitors
+        //
+        /**
+         * Visit nodes to elide module-specific modifiers.
+         *
+         * @param node The node to visit.
+         */
         function modifierVisitor(node) {
+            // Elide module-specific modifiers.
             switch (node.kind) {
-                case 84:
-                case 79:
+                case 84 /* ExportKeyword */:
+                case 79 /* DefaultKeyword */:
                     return undefined;
             }
             return node;
         }
+        //
+        // Emit Notification
+        //
+        /**
+         * Hook for node emit notifications.
+         *
+         * @param hint A hint as to the intended usage of the node.
+         * @param node The node to emit.
+         * @param emit A callback used to emit the node in the printer.
+         */
         function onEmitNode(hint, node, emitCallback) {
-            if (node.kind === 274) {
+            if (node.kind === 274 /* SourceFile */) {
                 currentSourceFile = node;
                 currentModuleInfo = moduleInfoMap[ts.getOriginalNodeId(currentSourceFile)];
                 noSubstitution = [];
@@ -56485,12 +72606,21 @@ var ts;
                 previousOnEmitNode(hint, node, emitCallback);
             }
         }
+        //
+        // Substitutions
+        //
+        /**
+         * Hooks node substitutions.
+         *
+         * @param hint A hint as to the intended usage of the node.
+         * @param node The node to substitute.
+         */
         function onSubstituteNode(hint, node) {
             node = previousOnSubstituteNode(hint, node);
             if (node.id && noSubstitution[node.id]) {
                 return node;
             }
-            if (hint === 1) {
+            if (hint === 1 /* Expression */) {
                 return substituteExpression(node);
             }
             else if (ts.isShorthandPropertyAssignment(node)) {
@@ -56498,10 +72628,18 @@ var ts;
             }
             return node;
         }
+        /**
+         * Substitution for a ShorthandPropertyAssignment whose declaration name is an imported
+         * or exported symbol.
+         *
+         * @param node The node to substitute.
+         */
         function substituteShorthandPropertyAssignment(node) {
             var name = node.name;
             var exportedOrImportedName = substituteExpressionIdentifier(name);
             if (exportedOrImportedName !== name) {
+                // A shorthand property with an assignment initializer is probably part of a
+                // destructuring assignment
                 if (node.objectAssignmentInitializer) {
                     var initializer = ts.createAssignment(exportedOrImportedName, node.objectAssignmentInitializer);
                     return ts.setTextRange(ts.createPropertyAssignment(name, initializer), node);
@@ -56510,20 +72648,31 @@ var ts;
             }
             return node;
         }
+        /**
+         * Substitution for an Expression that may contain an imported or exported symbol.
+         *
+         * @param node The node to substitute.
+         */
         function substituteExpression(node) {
             switch (node.kind) {
-                case 71:
+                case 71 /* Identifier */:
                     return substituteExpressionIdentifier(node);
-                case 200:
+                case 200 /* BinaryExpression */:
                     return substituteBinaryExpression(node);
-                case 199:
-                case 198:
+                case 199 /* PostfixUnaryExpression */:
+                case 198 /* PrefixUnaryExpression */:
                     return substituteUnaryExpression(node);
             }
             return node;
         }
+        /**
+         * Substitution for an Identifier expression that may contain an imported or exported
+         * symbol.
+         *
+         * @param node The node to substitute.
+         */
         function substituteExpressionIdentifier(node) {
-            if (ts.getEmitFlags(node) & 4096) {
+            if (ts.getEmitFlags(node) & 4096 /* HelperName */) {
                 var externalHelpersModuleName = ts.getExternalHelpersModuleName(currentSourceFile);
                 if (externalHelpersModuleName) {
                     return ts.createPropertyAccess(externalHelpersModuleName, node);
@@ -56532,23 +72681,39 @@ var ts;
             }
             if (!ts.isGeneratedIdentifier(node) && !ts.isLocalName(node)) {
                 var exportContainer = resolver.getReferencedExportContainer(node, ts.isExportName(node));
-                if (exportContainer && exportContainer.kind === 274) {
-                    return ts.setTextRange(ts.createPropertyAccess(ts.createIdentifier("exports"), ts.getSynthesizedClone(node)), node);
+                if (exportContainer && exportContainer.kind === 274 /* SourceFile */) {
+                    return ts.setTextRange(ts.createPropertyAccess(ts.createIdentifier("exports"), ts.getSynthesizedClone(node)), 
+                    /*location*/ node);
                 }
                 var importDeclaration = resolver.getReferencedImportDeclaration(node);
                 if (importDeclaration) {
                     if (ts.isImportClause(importDeclaration)) {
-                        return ts.setTextRange(ts.createPropertyAccess(ts.getGeneratedNameForNode(importDeclaration.parent), ts.createIdentifier("default")), node);
+                        return ts.setTextRange(ts.createPropertyAccess(ts.getGeneratedNameForNode(importDeclaration.parent), ts.createIdentifier("default")), 
+                        /*location*/ node);
                     }
                     else if (ts.isImportSpecifier(importDeclaration)) {
                         var name = importDeclaration.propertyName || importDeclaration.name;
-                        return ts.setTextRange(ts.createPropertyAccess(ts.getGeneratedNameForNode(importDeclaration.parent.parent.parent), ts.getSynthesizedClone(name)), node);
+                        return ts.setTextRange(ts.createPropertyAccess(ts.getGeneratedNameForNode(importDeclaration.parent.parent.parent), ts.getSynthesizedClone(name)), 
+                        /*location*/ node);
                     }
                 }
             }
             return node;
         }
+        /**
+         * Substitution for a BinaryExpression that may contain an imported or exported symbol.
+         *
+         * @param node The node to substitute.
+         */
         function substituteBinaryExpression(node) {
+            // When we see an assignment expression whose left-hand side is an exported symbol,
+            // we should ensure all exports of that symbol are updated with the correct value.
+            //
+            // - We do not substitute generated identifiers for any reason.
+            // - We do not substitute identifiers tagged with the LocalName flag.
+            // - We do not substitute identifiers that were originally the name of an enum or
+            //   namespace due to how they are transformed in TypeScript.
+            // - We only substitute identifiers that are exported at the top level.
             if (ts.isAssignmentOperator(node.operatorToken.kind)
                 && ts.isIdentifier(node.left)
                 && !ts.isGeneratedIdentifier(node.left)
@@ -56556,30 +72721,48 @@ var ts;
                 && !ts.isDeclarationNameOfEnumOrNamespace(node.left)) {
                 var exportedNames = getExports(node.left);
                 if (exportedNames) {
+                    // For each additional export of the declaration, apply an export assignment.
                     var expression = node;
                     for (var _i = 0, exportedNames_2 = exportedNames; _i < exportedNames_2.length; _i++) {
                         var exportName = exportedNames_2[_i];
+                        // Mark the node to prevent triggering this rule again.
                         noSubstitution[ts.getNodeId(expression)] = true;
-                        expression = createExportExpression(exportName, expression, node);
+                        expression = createExportExpression(exportName, expression, /*location*/ node);
                     }
                     return expression;
                 }
             }
             return node;
         }
+        /**
+         * Substitution for a UnaryExpression that may contain an imported or exported symbol.
+         *
+         * @param node The node to substitute.
+         */
         function substituteUnaryExpression(node) {
-            if ((node.operator === 43 || node.operator === 44)
+            // When we see a prefix or postfix increment expression whose operand is an exported
+            // symbol, we should ensure all exports of that symbol are updated with the correct
+            // value.
+            //
+            // - We do not substitute generated identifiers for any reason.
+            // - We do not substitute identifiers tagged with the LocalName flag.
+            // - We do not substitute identifiers that were originally the name of an enum or
+            //   namespace due to how they are transformed in TypeScript.
+            // - We only substitute identifiers that are exported at the top level.
+            if ((node.operator === 43 /* PlusPlusToken */ || node.operator === 44 /* MinusMinusToken */)
                 && ts.isIdentifier(node.operand)
                 && !ts.isGeneratedIdentifier(node.operand)
                 && !ts.isLocalName(node.operand)
                 && !ts.isDeclarationNameOfEnumOrNamespace(node.operand)) {
                 var exportedNames = getExports(node.operand);
                 if (exportedNames) {
-                    var expression = node.kind === 199
-                        ? ts.setTextRange(ts.createBinary(node.operand, ts.createToken(node.operator === 43 ? 59 : 60), ts.createLiteral(1)), node)
+                    var expression = node.kind === 199 /* PostfixUnaryExpression */
+                        ? ts.setTextRange(ts.createBinary(node.operand, ts.createToken(node.operator === 43 /* PlusPlusToken */ ? 59 /* PlusEqualsToken */ : 60 /* MinusEqualsToken */), ts.createLiteral(1)), 
+                        /*location*/ node)
                         : node;
                     for (var _i = 0, exportedNames_3 = exportedNames; _i < exportedNames_3.length; _i++) {
                         var exportName = exportedNames_3[_i];
+                        // Mark the node to prevent triggering this rule again.
                         noSubstitution[ts.getNodeId(expression)] = true;
                         expression = createExportExpression(exportName, expression);
                     }
@@ -56588,6 +72771,11 @@ var ts;
             }
             return node;
         }
+        /**
+         * Gets the additional exports of a name.
+         *
+         * @param name The name.
+         */
         function getExports(name) {
             if (!ts.isGeneratedIdentifier(name)) {
                 var valueDeclaration = resolver.getReferencedImportDeclaration(name)
@@ -56600,6 +72788,7 @@ var ts;
         }
     }
     ts.transformModule = transformModule;
+    // emit output for the __export helper function
     var exportStarHelper = {
         name: "typescript:export-star",
         scoped: true,
@@ -56608,25 +72797,29 @@ var ts;
     function createExportStarHelper(context, module) {
         var compilerOptions = context.getCompilerOptions();
         return compilerOptions.importHelpers
-            ? ts.createCall(ts.getHelperName("__exportStar"), undefined, [module, ts.createIdentifier("exports")])
-            : ts.createCall(ts.createIdentifier("__export"), undefined, [module]);
+            ? ts.createCall(ts.getHelperName("__exportStar"), /*typeArguments*/ undefined, [module, ts.createIdentifier("exports")])
+            : ts.createCall(ts.createIdentifier("__export"), /*typeArguments*/ undefined, [module]);
     }
+    // emit helper for dynamic import
     var dynamicImportUMDHelper = {
         name: "typescript:dynamicimport-sync-require",
         scoped: true,
         text: "\n            var __syncRequire = typeof module === \"object\" && typeof module.exports === \"object\";"
     };
+    // emit helper for `import * as Name from "foo"`
     var importStarHelper = {
         name: "typescript:commonjsimportstar",
         scoped: false,
         text: "\nvar __importStar = (this && this.__importStar) || function (mod) {\n    if (mod && mod.__esModule) return mod;\n    var result = {};\n    if (mod != null) for (var k in mod) if (Object.hasOwnProperty.call(mod, k)) result[k] = mod[k];\n    result[\"default\"] = mod;\n    return result;\n};"
     };
+    // emit helper for `import Name from "foo"`
     var importDefaultHelper = {
         name: "typescript:commonjsimportdefault",
         scoped: false,
         text: "\nvar __importDefault = (this && this.__importDefault) || function (mod) {\n    return (mod && mod.__esModule) ? mod : { \"default\": mod };\n};"
     };
 })(ts || (ts = {}));
+/*@internal*/
 var ts;
 (function (ts) {
     function transformSystemModule(context) {
@@ -56638,48 +72831,78 @@ var ts;
         var previousOnEmitNode = context.onEmitNode;
         context.onSubstituteNode = onSubstituteNode;
         context.onEmitNode = onEmitNode;
-        context.enableSubstitution(71);
-        context.enableSubstitution(271);
-        context.enableSubstitution(200);
-        context.enableSubstitution(198);
-        context.enableSubstitution(199);
-        context.enableEmitNotification(274);
-        var moduleInfoMap = [];
-        var deferredExports = [];
-        var exportFunctionsMap = [];
-        var noSubstitutionMap = [];
-        var currentSourceFile;
-        var moduleInfo;
-        var exportFunction;
-        var contextObject;
+        context.enableSubstitution(71 /* Identifier */); // Substitutes expression identifiers for imported symbols.
+        context.enableSubstitution(271 /* ShorthandPropertyAssignment */); // Substitutes expression identifiers for imported symbols
+        context.enableSubstitution(200 /* BinaryExpression */); // Substitutes assignments to exported symbols.
+        context.enableSubstitution(198 /* PrefixUnaryExpression */); // Substitutes updates to exported symbols.
+        context.enableSubstitution(199 /* PostfixUnaryExpression */); // Substitutes updates to exported symbols.
+        context.enableEmitNotification(274 /* SourceFile */); // Restore state when substituting nodes in a file.
+        var moduleInfoMap = []; // The ExternalModuleInfo for each file.
+        var deferredExports = []; // Exports to defer until an EndOfDeclarationMarker is found.
+        var exportFunctionsMap = []; // The export function associated with a source file.
+        var noSubstitutionMap = []; // Set of nodes for which substitution rules should be ignored for each file.
+        var currentSourceFile; // The current file.
+        var moduleInfo; // ExternalModuleInfo for the current file.
+        var exportFunction; // The export function for the current file.
+        var contextObject; // The context object for the current file.
         var hoistedStatements;
         var enclosingBlockScopedContainer;
-        var noSubstitution;
+        var noSubstitution; // Set of nodes for which substitution rules should be ignored.
         return ts.chainBundle(transformSourceFile);
+        /**
+         * Transforms the module aspects of a SourceFile.
+         *
+         * @param node The SourceFile node.
+         */
         function transformSourceFile(node) {
-            if (node.isDeclarationFile || !(ts.isEffectiveExternalModule(node, compilerOptions) || node.transformFlags & 67108864)) {
+            if (node.isDeclarationFile || !(ts.isEffectiveExternalModule(node, compilerOptions) || node.transformFlags & 67108864 /* ContainsDynamicImport */)) {
                 return node;
             }
             var id = ts.getOriginalNodeId(node);
             currentSourceFile = node;
             enclosingBlockScopedContainer = node;
+            // System modules have the following shape:
+            //
+            //     System.register(['dep-1', ... 'dep-n'], function(exports) {/* module body function */})
+            //
+            // The parameter 'exports' here is a callback '<T>(name: string, value: T) => T' that
+            // is used to publish exported values. 'exports' returns its 'value' argument so in
+            // most cases expressions that mutate exported values can be rewritten as:
+            //
+            //     expr -> exports('name', expr)
+            //
+            // The only exception in this rule is postfix unary operators,
+            // see comment to 'substitutePostfixUnaryExpression' for more details
+            // Collect information about the external module and dependency groups.
             moduleInfo = moduleInfoMap[id] = ts.collectExternalModuleInfo(node, resolver, compilerOptions);
+            // Make sure that the name of the 'exports' function does not conflict with
+            // existing identifiers.
             exportFunction = ts.createUniqueName("exports");
             exportFunctionsMap[id] = exportFunction;
             contextObject = ts.createUniqueName("context");
+            // Add the body of the module.
             var dependencyGroups = collectDependencyGroups(moduleInfo.externalImports);
             var moduleBodyBlock = createSystemModuleBody(node, dependencyGroups);
-            var moduleBodyFunction = ts.createFunctionExpression(undefined, undefined, undefined, undefined, [
-                ts.createParameter(undefined, undefined, undefined, exportFunction),
-                ts.createParameter(undefined, undefined, undefined, contextObject)
-            ], undefined, moduleBodyBlock);
+            var moduleBodyFunction = ts.createFunctionExpression(
+            /*modifiers*/ undefined, 
+            /*asteriskToken*/ undefined, 
+            /*name*/ undefined, 
+            /*typeParameters*/ undefined, [
+                ts.createParameter(/*decorators*/ undefined, /*modifiers*/ undefined, /*dotDotDotToken*/ undefined, exportFunction),
+                ts.createParameter(/*decorators*/ undefined, /*modifiers*/ undefined, /*dotDotDotToken*/ undefined, contextObject)
+            ], 
+            /*type*/ undefined, moduleBodyBlock);
+            // Write the call to `System.register`
+            // Clear the emit-helpers flag for later passes since we'll have already used it in the module body
+            // So the helper will be emit at the correct position instead of at the top of the source-file
             var moduleName = ts.tryGetModuleNameFromFile(node, host, compilerOptions);
             var dependencies = ts.createArrayLiteral(ts.map(dependencyGroups, function (dependencyGroup) { return dependencyGroup.name; }));
             var updated = ts.setEmitFlags(ts.updateSourceFileNode(node, ts.setTextRange(ts.createNodeArray([
-                ts.createStatement(ts.createCall(ts.createPropertyAccess(ts.createIdentifier("System"), "register"), undefined, moduleName
+                ts.createStatement(ts.createCall(ts.createPropertyAccess(ts.createIdentifier("System"), "register"), 
+                /*typeArguments*/ undefined, moduleName
                     ? [moduleName, dependencies, moduleBodyFunction]
                     : [dependencies, moduleBodyFunction]))
-            ]), node.statements)), 1024);
+            ]), node.statements)), 1024 /* NoTrailingComments */);
             if (!(compilerOptions.outFile || compilerOptions.out)) {
                 ts.moveEmitHelpers(updated, moduleBodyBlock, function (helper) { return !helper.scoped; });
             }
@@ -56695,6 +72918,11 @@ var ts;
             enclosingBlockScopedContainer = undefined;
             return ts.aggregateTransformFlags(updated);
         }
+        /**
+         * Collects the dependency groups for this files imports.
+         *
+         * @param externalImports The imports for the file.
+         */
         function collectDependencyGroups(externalImports) {
             var groupIndices = ts.createMap();
             var dependencyGroups = [];
@@ -56705,6 +72933,7 @@ var ts;
                     var text = externalModuleName.text;
                     var groupIndex = groupIndices.get(text);
                     if (groupIndex !== undefined) {
+                        // deduplicate/group entries in dependency list by the dependency name
                         dependencyGroups[groupIndex].externalImports.push(externalImport);
                     }
                     else {
@@ -56718,42 +72947,124 @@ var ts;
             }
             return dependencyGroups;
         }
+        /**
+         * Adds the statements for the module body function for the source file.
+         *
+         * @param node The source file for the module.
+         * @param dependencyGroups The grouped dependencies of the module.
+         */
         function createSystemModuleBody(node, dependencyGroups) {
+            // Shape of the body in system modules:
+            //
+            //  function (exports) {
+            //      <list of local aliases for imports>
+            //      <hoisted variable declarations>
+            //      <hoisted function declarations>
+            //      return {
+            //          setters: [
+            //              <list of setter function for imports>
+            //          ],
+            //          execute: function() {
+            //              <module statements>
+            //          }
+            //      }
+            //      <temp declarations>
+            //  }
+            //
+            // i.e:
+            //
+            //   import {x} from 'file1'
+            //   var y = 1;
+            //   export function foo() { return y + x(); }
+            //   console.log(y);
+            //
+            // Will be transformed to:
+            //
+            //  function(exports) {
+            //      function foo() { return y + file_1.x(); }
+            //      exports("foo", foo);
+            //      var file_1, y;
+            //      return {
+            //          setters: [
+            //              function(v) { file_1 = v }
+            //          ],
+            //          execute(): function() {
+            //              y = 1;
+            //              console.log(y);
+            //          }
+            //      };
+            //  }
             var statements = [];
+            // We start a new lexical environment in this function body, but *not* in the
+            // body of the execute function. This allows us to emit temporary declarations
+            // only in the outer module body and not in the inner one.
             startLexicalEnvironment();
+            // Add any prologue directives.
             var ensureUseStrict = ts.getStrictOptionValue(compilerOptions, "alwaysStrict") || (!compilerOptions.noImplicitUseStrict && ts.isExternalModule(currentSourceFile));
             var statementOffset = ts.addPrologue(statements, node.statements, ensureUseStrict, sourceElementVisitor);
-            statements.push(ts.createVariableStatement(undefined, ts.createVariableDeclarationList([
-                ts.createVariableDeclaration("__moduleName", undefined, ts.createLogicalAnd(contextObject, ts.createPropertyAccess(contextObject, "id")))
+            // var __moduleName = context_1 && context_1.id;
+            statements.push(ts.createVariableStatement(
+            /*modifiers*/ undefined, ts.createVariableDeclarationList([
+                ts.createVariableDeclaration("__moduleName", 
+                /*type*/ undefined, ts.createLogicalAnd(contextObject, ts.createPropertyAccess(contextObject, "id")))
             ])));
+            // Visit the synthetic external helpers import declaration if present
             ts.visitNode(moduleInfo.externalHelpersImportDeclaration, sourceElementVisitor, ts.isStatement);
+            // Visit the statements of the source file, emitting any transformations into
+            // the `executeStatements` array. We do this *before* we fill the `setters` array
+            // as we both emit transformations as well as aggregate some data used when creating
+            // setters. This allows us to reduce the number of times we need to loop through the
+            // statements of the source file.
             var executeStatements = ts.visitNodes(node.statements, sourceElementVisitor, ts.isStatement, statementOffset);
+            // Emit early exports for function declarations.
             ts.addRange(statements, hoistedStatements);
+            // We emit hoisted variables early to align roughly with our previous emit output.
+            // Two key differences in this approach are:
+            // - Temporary variables will appear at the top rather than at the bottom of the file
             ts.prependStatements(statements, endLexicalEnvironment());
-            var exportStarFunction = addExportStarIfNeeded(statements);
+            var exportStarFunction = addExportStarIfNeeded(statements); // TODO: GH#18217
             var moduleObject = ts.createObjectLiteral([
                 ts.createPropertyAssignment("setters", createSettersArray(exportStarFunction, dependencyGroups)),
-                ts.createPropertyAssignment("execute", ts.createFunctionExpression(undefined, undefined, undefined, undefined, [], undefined, ts.createBlock(executeStatements, true)))
+                ts.createPropertyAssignment("execute", ts.createFunctionExpression(
+                /*modifiers*/ undefined, 
+                /*asteriskToken*/ undefined, 
+                /*name*/ undefined, 
+                /*typeParameters*/ undefined, 
+                /*parameters*/ [], 
+                /*type*/ undefined, ts.createBlock(executeStatements, /*multiLine*/ true)))
             ]);
             moduleObject.multiLine = true;
             statements.push(ts.createReturn(moduleObject));
-            return ts.createBlock(statements, true);
+            return ts.createBlock(statements, /*multiLine*/ true);
         }
+        /**
+         * Adds an exportStar function to a statement list if it is needed for the file.
+         *
+         * @param statements A statement list.
+         */
         function addExportStarIfNeeded(statements) {
             if (!moduleInfo.hasExportStarsToExportValues) {
                 return;
             }
+            // when resolving exports local exported entries/indirect exported entries in the module
+            // should always win over entries with similar names that were added via star exports
+            // to support this we store names of local/indirect exported entries in a set.
+            // this set is used to filter names brought by star expors.
+            // local names set should only be added if we have anything exported
             if (!moduleInfo.exportedNames && moduleInfo.exportSpecifiers.size === 0) {
+                // no exported declarations (export var ...) or export specifiers (export {x})
+                // check if we have any non star export declarations.
                 var hasExportDeclarationWithExportClause = false;
                 for (var _i = 0, _a = moduleInfo.externalImports; _i < _a.length; _i++) {
                     var externalImport = _a[_i];
-                    if (externalImport.kind === 250 && externalImport.exportClause) {
+                    if (externalImport.kind === 250 /* ExportDeclaration */ && externalImport.exportClause) {
                         hasExportDeclarationWithExportClause = true;
                         break;
                     }
                 }
                 if (!hasExportDeclarationWithExportClause) {
-                    var exportStarFunction_1 = createExportStarFunction(undefined);
+                    // we still need to emit exportStar helper
+                    var exportStarFunction_1 = createExportStarFunction(/*localNames*/ undefined);
                     statements.push(exportStarFunction_1);
                     return exportStarFunction_1.name;
                 }
@@ -56765,30 +73076,42 @@ var ts;
                     if (exportedLocalName.escapedText === "default") {
                         continue;
                     }
+                    // write name of exported declaration, i.e 'export var x...'
                     exportedNames.push(ts.createPropertyAssignment(ts.createLiteral(exportedLocalName), ts.createTrue()));
                 }
             }
             for (var _d = 0, _e = moduleInfo.externalImports; _d < _e.length; _d++) {
                 var externalImport = _e[_d];
-                if (externalImport.kind !== 250) {
+                if (externalImport.kind !== 250 /* ExportDeclaration */) {
                     continue;
                 }
                 if (!externalImport.exportClause) {
+                    // export * from ...
                     continue;
                 }
                 for (var _f = 0, _g = externalImport.exportClause.elements; _f < _g.length; _f++) {
                     var element = _g[_f];
+                    // write name of indirectly exported entry, i.e. 'export {x} from ...'
                     exportedNames.push(ts.createPropertyAssignment(ts.createLiteral(ts.idText(element.name || element.propertyName)), ts.createTrue()));
                 }
             }
             var exportedNamesStorageRef = ts.createUniqueName("exportedNames");
-            statements.push(ts.createVariableStatement(undefined, ts.createVariableDeclarationList([
-                ts.createVariableDeclaration(exportedNamesStorageRef, undefined, ts.createObjectLiteral(exportedNames, true))
+            statements.push(ts.createVariableStatement(
+            /*modifiers*/ undefined, ts.createVariableDeclarationList([
+                ts.createVariableDeclaration(exportedNamesStorageRef, 
+                /*type*/ undefined, ts.createObjectLiteral(exportedNames, /*multiline*/ true))
             ])));
             var exportStarFunction = createExportStarFunction(exportedNamesStorageRef);
             statements.push(exportStarFunction);
             return exportStarFunction.name;
         }
+        /**
+         * Creates an exportStar function for the file, with an optional set of excluded local
+         * names.
+         *
+         * @param localNames An optional reference to an object containing a set of excluded local
+         * names.
+         */
         function createExportStarFunction(localNames) {
             var exportStarFunction = ts.createUniqueName("exportStar");
             var m = ts.createIdentifier("m");
@@ -56796,79 +73119,135 @@ var ts;
             var exports = ts.createIdentifier("exports");
             var condition = ts.createStrictInequality(n, ts.createLiteral("default"));
             if (localNames) {
-                condition = ts.createLogicalAnd(condition, ts.createLogicalNot(ts.createCall(ts.createPropertyAccess(localNames, "hasOwnProperty"), undefined, [n])));
+                condition = ts.createLogicalAnd(condition, ts.createLogicalNot(ts.createCall(ts.createPropertyAccess(localNames, "hasOwnProperty"), 
+                /*typeArguments*/ undefined, [n])));
             }
-            return ts.createFunctionDeclaration(undefined, undefined, undefined, exportStarFunction, undefined, [ts.createParameter(undefined, undefined, undefined, m)], undefined, ts.createBlock([
-                ts.createVariableStatement(undefined, ts.createVariableDeclarationList([
-                    ts.createVariableDeclaration(exports, undefined, ts.createObjectLiteral([]))
+            return ts.createFunctionDeclaration(
+            /*decorators*/ undefined, 
+            /*modifiers*/ undefined, 
+            /*asteriskToken*/ undefined, exportStarFunction, 
+            /*typeParameters*/ undefined, [ts.createParameter(/*decorators*/ undefined, /*modifiers*/ undefined, /*dotDotDotToken*/ undefined, m)], 
+            /*type*/ undefined, ts.createBlock([
+                ts.createVariableStatement(
+                /*modifiers*/ undefined, ts.createVariableDeclarationList([
+                    ts.createVariableDeclaration(exports, 
+                    /*type*/ undefined, ts.createObjectLiteral([]))
                 ])),
                 ts.createForIn(ts.createVariableDeclarationList([
-                    ts.createVariableDeclaration(n, undefined)
+                    ts.createVariableDeclaration(n, /*type*/ undefined)
                 ]), m, ts.createBlock([
-                    ts.setEmitFlags(ts.createIf(condition, ts.createStatement(ts.createAssignment(ts.createElementAccess(exports, n), ts.createElementAccess(m, n)))), 1)
+                    ts.setEmitFlags(ts.createIf(condition, ts.createStatement(ts.createAssignment(ts.createElementAccess(exports, n), ts.createElementAccess(m, n)))), 1 /* SingleLine */)
                 ])),
-                ts.createStatement(ts.createCall(exportFunction, undefined, [exports]))
-            ], true));
+                ts.createStatement(ts.createCall(exportFunction, 
+                /*typeArguments*/ undefined, [exports]))
+            ], /*multiline*/ true));
         }
+        /**
+         * Creates an array setter callbacks for each dependency group.
+         *
+         * @param exportStarFunction A reference to an exportStarFunction for the file.
+         * @param dependencyGroups An array of grouped dependencies.
+         */
         function createSettersArray(exportStarFunction, dependencyGroups) {
             var setters = [];
             for (var _i = 0, dependencyGroups_1 = dependencyGroups; _i < dependencyGroups_1.length; _i++) {
                 var group_1 = dependencyGroups_1[_i];
+                // derive a unique name for parameter from the first named entry in the group
                 var localName = ts.forEach(group_1.externalImports, function (i) { return ts.getLocalNameForExternalImport(i, currentSourceFile); });
                 var parameterName = localName ? ts.getGeneratedNameForNode(localName) : ts.createUniqueName("");
                 var statements = [];
                 for (var _a = 0, _b = group_1.externalImports; _a < _b.length; _a++) {
                     var entry = _b[_a];
-                    var importVariableName = ts.getLocalNameForExternalImport(entry, currentSourceFile);
+                    var importVariableName = ts.getLocalNameForExternalImport(entry, currentSourceFile); // TODO: GH#18217
                     switch (entry.kind) {
-                        case 244:
+                        case 244 /* ImportDeclaration */:
                             if (!entry.importClause) {
+                                // 'import "..."' case
+                                // module is imported only for side-effects, no emit required
                                 break;
                             }
-                        case 243:
+                        // falls through
+                        case 243 /* ImportEqualsDeclaration */:
                             ts.Debug.assert(importVariableName !== undefined);
+                            // save import into the local
                             statements.push(ts.createStatement(ts.createAssignment(importVariableName, parameterName)));
                             break;
-                        case 250:
+                        case 250 /* ExportDeclaration */:
                             ts.Debug.assert(importVariableName !== undefined);
                             if (entry.exportClause) {
+                                //  export {a, b as c} from 'foo'
+                                //
+                                // emit as:
+                                //
+                                //  exports_({
+                                //     "a": _["a"],
+                                //     "c": _["b"]
+                                //  });
                                 var properties = [];
                                 for (var _c = 0, _d = entry.exportClause.elements; _c < _d.length; _c++) {
                                     var e = _d[_c];
                                     properties.push(ts.createPropertyAssignment(ts.createLiteral(ts.idText(e.name)), ts.createElementAccess(parameterName, ts.createLiteral(ts.idText(e.propertyName || e.name)))));
                                 }
-                                statements.push(ts.createStatement(ts.createCall(exportFunction, undefined, [ts.createObjectLiteral(properties, true)])));
+                                statements.push(ts.createStatement(ts.createCall(exportFunction, 
+                                /*typeArguments*/ undefined, [ts.createObjectLiteral(properties, /*multiline*/ true)])));
                             }
                             else {
-                                statements.push(ts.createStatement(ts.createCall(exportStarFunction, undefined, [parameterName])));
+                                //  export * from 'foo'
+                                //
+                                // emit as:
+                                //
+                                //  exportStar(foo_1_1);
+                                statements.push(ts.createStatement(ts.createCall(exportStarFunction, 
+                                /*typeArguments*/ undefined, [parameterName])));
                             }
                             break;
                     }
                 }
-                setters.push(ts.createFunctionExpression(undefined, undefined, undefined, undefined, [ts.createParameter(undefined, undefined, undefined, parameterName)], undefined, ts.createBlock(statements, true)));
+                setters.push(ts.createFunctionExpression(
+                /*modifiers*/ undefined, 
+                /*asteriskToken*/ undefined, 
+                /*name*/ undefined, 
+                /*typeParameters*/ undefined, [ts.createParameter(/*decorators*/ undefined, /*modifiers*/ undefined, /*dotDotDotToken*/ undefined, parameterName)], 
+                /*type*/ undefined, ts.createBlock(statements, /*multiLine*/ true)));
             }
-            return ts.createArrayLiteral(setters, true);
+            return ts.createArrayLiteral(setters, /*multiLine*/ true);
         }
+        //
+        // Top-level Source Element Visitors
+        //
+        /**
+         * Visit source elements at the top-level of a module.
+         *
+         * @param node The node to visit.
+         */
         function sourceElementVisitor(node) {
             switch (node.kind) {
-                case 244:
+                case 244 /* ImportDeclaration */:
                     return visitImportDeclaration(node);
-                case 243:
+                case 243 /* ImportEqualsDeclaration */:
                     return visitImportEqualsDeclaration(node);
-                case 250:
+                case 250 /* ExportDeclaration */:
+                    // ExportDeclarations are elided as they are handled via
+                    // `appendExportsOfDeclaration`.
                     return undefined;
-                case 249:
+                case 249 /* ExportAssignment */:
                     return visitExportAssignment(node);
                 default:
                     return nestedElementVisitor(node);
             }
         }
+        /**
+         * Visits an ImportDeclaration node.
+         *
+         * @param node The node to visit.
+         */
         function visitImportDeclaration(node) {
             var statements;
             if (node.importClause) {
-                hoistVariableDeclaration(ts.getLocalNameForExternalImport(node, currentSourceFile));
+                hoistVariableDeclaration(ts.getLocalNameForExternalImport(node, currentSourceFile)); // TODO: GH#18217
             }
             if (hasAssociatedEndOfDeclarationMarker(node)) {
+                // Defer exports until we encounter an EndOfDeclarationMarker node
                 var id = ts.getOriginalNodeId(node);
                 deferredExports[id] = appendExportsOfImportDeclaration(deferredExports[id], node);
             }
@@ -56877,11 +73256,17 @@ var ts;
             }
             return ts.singleOrMany(statements);
         }
+        /**
+         * Visits an ImportEqualsDeclaration node.
+         *
+         * @param node The node to visit.
+         */
         function visitImportEqualsDeclaration(node) {
             ts.Debug.assert(ts.isExternalModuleImportEqualsDeclaration(node), "import= for internal module references should be handled in an earlier transformer.");
             var statements;
-            hoistVariableDeclaration(ts.getLocalNameForExternalImport(node, currentSourceFile));
+            hoistVariableDeclaration(ts.getLocalNameForExternalImport(node, currentSourceFile)); // TODO: GH#18217
             if (hasAssociatedEndOfDeclarationMarker(node)) {
+                // Defer exports until we encounter an EndOfDeclarationMarker node
                 var id = ts.getOriginalNodeId(node);
                 deferredExports[id] = appendExportsOfImportEqualsDeclaration(deferredExports[id], node);
             }
@@ -56890,28 +73275,43 @@ var ts;
             }
             return ts.singleOrMany(statements);
         }
+        /**
+         * Visits an ExportAssignment node.
+         *
+         * @param node The node to visit.
+         */
         function visitExportAssignment(node) {
             if (node.isExportEquals) {
+                // Elide `export=` as it is illegal in a SystemJS module.
                 return undefined;
             }
             var expression = ts.visitNode(node.expression, destructuringAndImportCallVisitor, ts.isExpression);
             var original = node.original;
             if (original && hasAssociatedEndOfDeclarationMarker(original)) {
+                // Defer exports until we encounter an EndOfDeclarationMarker node
                 var id = ts.getOriginalNodeId(node);
-                deferredExports[id] = appendExportStatement(deferredExports[id], ts.createIdentifier("default"), expression, true);
+                deferredExports[id] = appendExportStatement(deferredExports[id], ts.createIdentifier("default"), expression, /*allowComments*/ true);
             }
             else {
-                return createExportStatement(ts.createIdentifier("default"), expression, true);
+                return createExportStatement(ts.createIdentifier("default"), expression, /*allowComments*/ true);
             }
         }
+        /**
+         * Visits a FunctionDeclaration, hoisting it to the outer module body function.
+         *
+         * @param node The node to visit.
+         */
         function visitFunctionDeclaration(node) {
-            if (ts.hasModifier(node, 1)) {
-                hoistedStatements = ts.append(hoistedStatements, ts.updateFunctionDeclaration(node, node.decorators, ts.visitNodes(node.modifiers, modifierVisitor, ts.isModifier), node.asteriskToken, ts.getDeclarationName(node, true, true), undefined, ts.visitNodes(node.parameters, destructuringAndImportCallVisitor, ts.isParameterDeclaration), undefined, ts.visitNode(node.body, destructuringAndImportCallVisitor, ts.isBlock)));
+            if (ts.hasModifier(node, 1 /* Export */)) {
+                hoistedStatements = ts.append(hoistedStatements, ts.updateFunctionDeclaration(node, node.decorators, ts.visitNodes(node.modifiers, modifierVisitor, ts.isModifier), node.asteriskToken, ts.getDeclarationName(node, /*allowComments*/ true, /*allowSourceMaps*/ true), 
+                /*typeParameters*/ undefined, ts.visitNodes(node.parameters, destructuringAndImportCallVisitor, ts.isParameterDeclaration), 
+                /*type*/ undefined, ts.visitNode(node.body, destructuringAndImportCallVisitor, ts.isBlock)));
             }
             else {
                 hoistedStatements = ts.append(hoistedStatements, ts.visitEachChild(node, destructuringAndImportCallVisitor, context));
             }
             if (hasAssociatedEndOfDeclarationMarker(node)) {
+                // Defer exports until we encounter an EndOfDeclarationMarker node
                 var id = ts.getOriginalNodeId(node);
                 deferredExports[id] = appendExportsOfHoistedDeclaration(deferredExports[id], node);
             }
@@ -56920,12 +73320,22 @@ var ts;
             }
             return undefined;
         }
+        /**
+         * Visits a ClassDeclaration, hoisting its name to the outer module body function.
+         *
+         * @param node The node to visit.
+         */
         function visitClassDeclaration(node) {
             var statements;
+            // Hoist the name of the class declaration to the outer module body function.
             var name = ts.getLocalName(node);
             hoistVariableDeclaration(name);
-            statements = ts.append(statements, ts.setTextRange(ts.createStatement(ts.createAssignment(name, ts.setTextRange(ts.createClassExpression(undefined, node.name, undefined, ts.visitNodes(node.heritageClauses, destructuringAndImportCallVisitor, ts.isHeritageClause), ts.visitNodes(node.members, destructuringAndImportCallVisitor, ts.isClassElement)), node))), node));
+            // Rewrite the class declaration into an assignment of a class expression.
+            statements = ts.append(statements, ts.setTextRange(ts.createStatement(ts.createAssignment(name, ts.setTextRange(ts.createClassExpression(
+            /*modifiers*/ undefined, node.name, 
+            /*typeParameters*/ undefined, ts.visitNodes(node.heritageClauses, destructuringAndImportCallVisitor, ts.isHeritageClause), ts.visitNodes(node.members, destructuringAndImportCallVisitor, ts.isClassElement)), node))), node));
             if (hasAssociatedEndOfDeclarationMarker(node)) {
+                // Defer exports until we encounter an EndOfDeclarationMarker node
                 var id = ts.getOriginalNodeId(node);
                 deferredExports[id] = appendExportsOfHoistedDeclaration(deferredExports[id], node);
             }
@@ -56934,12 +73344,18 @@ var ts;
             }
             return ts.singleOrMany(statements);
         }
+        /**
+         * Visits a variable statement, hoisting declared names to the top-level module body.
+         * Each declaration is rewritten into an assignment expression.
+         *
+         * @param node The node to visit.
+         */
         function visitVariableStatement(node) {
             if (!shouldHoistVariableDeclarationList(node.declarationList)) {
                 return ts.visitNode(node, destructuringAndImportCallVisitor, ts.isStatement);
             }
             var expressions;
-            var isExportedDeclaration = ts.hasModifier(node, 1);
+            var isExportedDeclaration = ts.hasModifier(node, 1 /* Export */);
             var isMarkedDeclaration = hasAssociatedEndOfDeclarationMarker(node);
             for (var _i = 0, _a = node.declarationList.declarations; _i < _a.length; _i++) {
                 var variable = _a[_i];
@@ -56955,14 +73371,20 @@ var ts;
                 statements = ts.append(statements, ts.setTextRange(ts.createStatement(ts.inlineExpressions(expressions)), node));
             }
             if (isMarkedDeclaration) {
+                // Defer exports until we encounter an EndOfDeclarationMarker node
                 var id = ts.getOriginalNodeId(node);
                 deferredExports[id] = appendExportsOfVariableStatement(deferredExports[id], node, isExportedDeclaration);
             }
             else {
-                statements = appendExportsOfVariableStatement(statements, node, false);
+                statements = appendExportsOfVariableStatement(statements, node, /*exportSelf*/ false);
             }
             return ts.singleOrMany(statements);
         }
+        /**
+         * Hoists the declared names of a VariableDeclaration or BindingElement.
+         *
+         * @param node The declaration to hoist.
+         */
         function hoistBindingElement(node) {
             if (ts.isBindingPattern(node.name)) {
                 for (var _i = 0, _a = node.name.elements; _i < _a.length; _i++) {
@@ -56976,41 +73398,103 @@ var ts;
                 hoistVariableDeclaration(ts.getSynthesizedClone(node.name));
             }
         }
+        /**
+         * Determines whether a VariableDeclarationList should be hoisted.
+         *
+         * @param node The node to test.
+         */
         function shouldHoistVariableDeclarationList(node) {
-            return (ts.getEmitFlags(node) & 2097152) === 0
-                && (enclosingBlockScopedContainer.kind === 274
-                    || (ts.getOriginalNode(node).flags & 3) === 0);
+            // hoist only non-block scoped declarations or block scoped declarations parented by source file
+            return (ts.getEmitFlags(node) & 2097152 /* NoHoisting */) === 0
+                && (enclosingBlockScopedContainer.kind === 274 /* SourceFile */
+                    || (ts.getOriginalNode(node).flags & 3 /* BlockScoped */) === 0);
         }
+        /**
+         * Transform an initialized variable declaration into an expression.
+         *
+         * @param node The node to transform.
+         * @param isExportedDeclaration A value indicating whether the variable is exported.
+         */
         function transformInitializedVariable(node, isExportedDeclaration) {
             var createAssignment = isExportedDeclaration ? createExportedVariableAssignment : createNonExportedVariableAssignment;
             return ts.isBindingPattern(node.name)
-                ? ts.flattenDestructuringAssignment(node, destructuringAndImportCallVisitor, context, 0, false, createAssignment)
+                ? ts.flattenDestructuringAssignment(node, destructuringAndImportCallVisitor, context, 0 /* All */, 
+                /*needsValue*/ false, createAssignment)
                 : node.initializer ? createAssignment(node.name, ts.visitNode(node.initializer, destructuringAndImportCallVisitor, ts.isExpression)) : node.name;
         }
+        /**
+         * Creates an assignment expression for an exported variable declaration.
+         *
+         * @param name The name of the variable.
+         * @param value The value of the variable's initializer.
+         * @param location The source map location for the assignment.
+         */
         function createExportedVariableAssignment(name, value, location) {
-            return createVariableAssignment(name, value, location, true);
+            return createVariableAssignment(name, value, location, /*isExportedDeclaration*/ true);
         }
+        /**
+         * Creates an assignment expression for a non-exported variable declaration.
+         *
+         * @param name The name of the variable.
+         * @param value The value of the variable's initializer.
+         * @param location The source map location for the assignment.
+         */
         function createNonExportedVariableAssignment(name, value, location) {
-            return createVariableAssignment(name, value, location, false);
+            return createVariableAssignment(name, value, location, /*isExportedDeclaration*/ false);
         }
+        /**
+         * Creates an assignment expression for a variable declaration.
+         *
+         * @param name The name of the variable.
+         * @param value The value of the variable's initializer.
+         * @param location The source map location for the assignment.
+         * @param isExportedDeclaration A value indicating whether the variable is exported.
+         */
         function createVariableAssignment(name, value, location, isExportedDeclaration) {
             hoistVariableDeclaration(ts.getSynthesizedClone(name));
             return isExportedDeclaration
                 ? createExportExpression(name, preventSubstitution(ts.setTextRange(ts.createAssignment(name, value), location)))
                 : preventSubstitution(ts.setTextRange(ts.createAssignment(name, value), location));
         }
+        /**
+         * Visits a MergeDeclarationMarker used as a placeholder for the beginning of a merged
+         * and transformed declaration.
+         *
+         * @param node The node to visit.
+         */
         function visitMergeDeclarationMarker(node) {
-            if (hasAssociatedEndOfDeclarationMarker(node) && node.original.kind === 214) {
+            // For an EnumDeclaration or ModuleDeclaration that merges with a preceeding
+            // declaration we do not emit a leading variable declaration. To preserve the
+            // begin/end semantics of the declararation and to properly handle exports
+            // we wrapped the leading variable declaration in a `MergeDeclarationMarker`.
+            //
+            // To balance the declaration, we defer the exports of the elided variable
+            // statement until we visit this declaration's `EndOfDeclarationMarker`.
+            if (hasAssociatedEndOfDeclarationMarker(node) && node.original.kind === 214 /* VariableStatement */) {
                 var id = ts.getOriginalNodeId(node);
-                var isExportedDeclaration = ts.hasModifier(node.original, 1);
+                var isExportedDeclaration = ts.hasModifier(node.original, 1 /* Export */);
                 deferredExports[id] = appendExportsOfVariableStatement(deferredExports[id], node.original, isExportedDeclaration);
             }
             return node;
         }
+        /**
+         * Determines whether a node has an associated EndOfDeclarationMarker.
+         *
+         * @param node The node to test.
+         */
         function hasAssociatedEndOfDeclarationMarker(node) {
-            return (ts.getEmitFlags(node) & 4194304) !== 0;
+            return (ts.getEmitFlags(node) & 4194304 /* HasEndOfDeclarationMarker */) !== 0;
         }
+        /**
+         * Visits a DeclarationMarker used as a placeholder for the end of a transformed
+         * declaration.
+         *
+         * @param node The node to visit.
+         */
         function visitEndOfDeclarationMarker(node) {
+            // For some transformations we emit an `EndOfDeclarationMarker` to mark the actual
+            // end of the transformed declaration. We use this marker to emit any deferred exports
+            // of the declaration.
             var id = ts.getOriginalNodeId(node);
             var statements = deferredExports[id];
             if (statements) {
@@ -57025,6 +73509,15 @@ var ts;
             }
             return node;
         }
+        /**
+         * Appends the exports of an ImportDeclaration to a statement list, returning the
+         * statement list.
+         *
+         * @param statements A statement list to which the down-level export statements are to be
+         * appended. If `statements` is `undefined`, a new array is allocated if statements are
+         * appended.
+         * @param decl The declaration whose exports are to be recorded.
+         */
         function appendExportsOfImportDeclaration(statements, decl) {
             if (moduleInfo.exportEquals) {
                 return statements;
@@ -57039,10 +73532,10 @@ var ts;
             var namedBindings = importClause.namedBindings;
             if (namedBindings) {
                 switch (namedBindings.kind) {
-                    case 246:
+                    case 246 /* NamespaceImport */:
                         statements = appendExportsOfDeclaration(statements, namedBindings);
                         break;
-                    case 247:
+                    case 247 /* NamedImports */:
                         for (var _i = 0, _a = namedBindings.elements; _i < _a.length; _i++) {
                             var importBinding = _a[_i];
                             statements = appendExportsOfDeclaration(statements, importBinding);
@@ -57052,12 +73545,32 @@ var ts;
             }
             return statements;
         }
+        /**
+         * Appends the export of an ImportEqualsDeclaration to a statement list, returning the
+         * statement list.
+         *
+         * @param statements A statement list to which the down-level export statements are to be
+         * appended. If `statements` is `undefined`, a new array is allocated if statements are
+         * appended.
+         * @param decl The declaration whose exports are to be recorded.
+         */
         function appendExportsOfImportEqualsDeclaration(statements, decl) {
             if (moduleInfo.exportEquals) {
                 return statements;
             }
             return appendExportsOfDeclaration(statements, decl);
         }
+        /**
+         * Appends the exports of a VariableStatement to a statement list, returning the statement
+         * list.
+         *
+         * @param statements A statement list to which the down-level export statements are to be
+         * appended. If `statements` is `undefined`, a new array is allocated if statements are
+         * appended.
+         * @param node The VariableStatement whose exports are to be recorded.
+         * @param exportSelf A value indicating whether to also export each VariableDeclaration of
+         * `nodes` declaration list.
+         */
         function appendExportsOfVariableStatement(statements, node, exportSelf) {
             if (moduleInfo.exportEquals) {
                 return statements;
@@ -57070,6 +73583,16 @@ var ts;
             }
             return statements;
         }
+        /**
+         * Appends the exports of a VariableDeclaration or BindingElement to a statement list,
+         * returning the statement list.
+         *
+         * @param statements A statement list to which the down-level export statements are to be
+         * appended. If `statements` is `undefined`, a new array is allocated if statements are
+         * appended.
+         * @param decl The declaration whose exports are to be recorded.
+         * @param exportSelf A value indicating whether to also export the declaration itself.
+         */
         function appendExportsOfBindingElement(statements, decl, exportSelf) {
             if (moduleInfo.exportEquals) {
                 return statements;
@@ -57092,13 +73615,22 @@ var ts;
             }
             return statements;
         }
+        /**
+         * Appends the exports of a ClassDeclaration or FunctionDeclaration to a statement list,
+         * returning the statement list.
+         *
+         * @param statements A statement list to which the down-level export statements are to be
+         * appended. If `statements` is `undefined`, a new array is allocated if statements are
+         * appended.
+         * @param decl The declaration whose exports are to be recorded.
+         */
         function appendExportsOfHoistedDeclaration(statements, decl) {
             if (moduleInfo.exportEquals) {
                 return statements;
             }
             var excludeName;
-            if (ts.hasModifier(decl, 1)) {
-                var exportName = ts.hasModifier(decl, 512) ? ts.createLiteral("default") : decl.name;
+            if (ts.hasModifier(decl, 1 /* Export */)) {
+                var exportName = ts.hasModifier(decl, 512 /* Default */) ? ts.createLiteral("default") : decl.name;
                 statements = appendExportStatement(statements, exportName, ts.getLocalName(decl));
                 excludeName = ts.getTextOfIdentifierOrLiteral(exportName);
             }
@@ -57107,6 +73639,15 @@ var ts;
             }
             return statements;
         }
+        /**
+         * Appends the exports of a declaration to a statement list, returning the statement list.
+         *
+         * @param statements A statement list to which the down-level export statements are to be
+         * appended. If `statements` is `undefined`, a new array is allocated if statements are
+         * appended.
+         * @param decl The declaration to export.
+         * @param excludeName An optional name to exclude from exports.
+         */
         function appendExportsOfDeclaration(statements, decl, excludeName) {
             if (moduleInfo.exportEquals) {
                 return statements;
@@ -57123,67 +73664,104 @@ var ts;
             }
             return statements;
         }
+        /**
+         * Appends the down-level representation of an export to a statement list, returning the
+         * statement list.
+         *
+         * @param statements A statement list to which the down-level export statements are to be
+         * appended. If `statements` is `undefined`, a new array is allocated if statements are
+         * appended.
+         * @param exportName The name of the export.
+         * @param expression The expression to export.
+         * @param allowComments Whether to allow comments on the export.
+         */
         function appendExportStatement(statements, exportName, expression, allowComments) {
             statements = ts.append(statements, createExportStatement(exportName, expression, allowComments));
             return statements;
         }
+        /**
+         * Creates a call to the current file's export function to export a value.
+         *
+         * @param name The bound name of the export.
+         * @param value The exported value.
+         * @param allowComments An optional value indicating whether to emit comments for the statement.
+         */
         function createExportStatement(name, value, allowComments) {
             var statement = ts.createStatement(createExportExpression(name, value));
             ts.startOnNewLine(statement);
             if (!allowComments) {
-                ts.setEmitFlags(statement, 1536);
+                ts.setEmitFlags(statement, 1536 /* NoComments */);
             }
             return statement;
         }
+        /**
+         * Creates a call to the current file's export function to export a value.
+         *
+         * @param name The bound name of the export.
+         * @param value The exported value.
+         */
         function createExportExpression(name, value) {
             var exportName = ts.isIdentifier(name) ? ts.createLiteral(name) : name;
-            ts.setEmitFlags(value, ts.getEmitFlags(value) | 1536);
-            return ts.setCommentRange(ts.createCall(exportFunction, undefined, [exportName, value]), value);
+            ts.setEmitFlags(value, ts.getEmitFlags(value) | 1536 /* NoComments */);
+            return ts.setCommentRange(ts.createCall(exportFunction, /*typeArguments*/ undefined, [exportName, value]), value);
         }
+        //
+        // Top-Level or Nested Source Element Visitors
+        //
+        /**
+         * Visit nested elements at the top-level of a module.
+         *
+         * @param node The node to visit.
+         */
         function nestedElementVisitor(node) {
             switch (node.kind) {
-                case 214:
+                case 214 /* VariableStatement */:
                     return visitVariableStatement(node);
-                case 234:
+                case 234 /* FunctionDeclaration */:
                     return visitFunctionDeclaration(node);
-                case 235:
+                case 235 /* ClassDeclaration */:
                     return visitClassDeclaration(node);
-                case 220:
+                case 220 /* ForStatement */:
                     return visitForStatement(node);
-                case 221:
+                case 221 /* ForInStatement */:
                     return visitForInStatement(node);
-                case 222:
+                case 222 /* ForOfStatement */:
                     return visitForOfStatement(node);
-                case 218:
+                case 218 /* DoStatement */:
                     return visitDoStatement(node);
-                case 219:
+                case 219 /* WhileStatement */:
                     return visitWhileStatement(node);
-                case 228:
+                case 228 /* LabeledStatement */:
                     return visitLabeledStatement(node);
-                case 226:
+                case 226 /* WithStatement */:
                     return visitWithStatement(node);
-                case 227:
+                case 227 /* SwitchStatement */:
                     return visitSwitchStatement(node);
-                case 241:
+                case 241 /* CaseBlock */:
                     return visitCaseBlock(node);
-                case 266:
+                case 266 /* CaseClause */:
                     return visitCaseClause(node);
-                case 267:
+                case 267 /* DefaultClause */:
                     return visitDefaultClause(node);
-                case 230:
+                case 230 /* TryStatement */:
                     return visitTryStatement(node);
-                case 269:
+                case 269 /* CatchClause */:
                     return visitCatchClause(node);
-                case 213:
+                case 213 /* Block */:
                     return visitBlock(node);
-                case 303:
+                case 303 /* MergeDeclarationMarker */:
                     return visitMergeDeclarationMarker(node);
-                case 304:
+                case 304 /* EndOfDeclarationMarker */:
                     return visitEndOfDeclarationMarker(node);
                 default:
                     return destructuringAndImportCallVisitor(node);
             }
         }
+        /**
+         * Visits the body of a ForStatement to hoist declarations.
+         *
+         * @param node The node to visit.
+         */
         function visitForStatement(node) {
             var savedEnclosingBlockScopedContainer = enclosingBlockScopedContainer;
             enclosingBlockScopedContainer = node;
@@ -57191,6 +73769,11 @@ var ts;
             enclosingBlockScopedContainer = savedEnclosingBlockScopedContainer;
             return node;
         }
+        /**
+         * Visits the body of a ForInStatement to hoist declarations.
+         *
+         * @param node The node to visit.
+         */
         function visitForInStatement(node) {
             var savedEnclosingBlockScopedContainer = enclosingBlockScopedContainer;
             enclosingBlockScopedContainer = node;
@@ -57198,6 +73781,11 @@ var ts;
             enclosingBlockScopedContainer = savedEnclosingBlockScopedContainer;
             return node;
         }
+        /**
+         * Visits the body of a ForOfStatement to hoist declarations.
+         *
+         * @param node The node to visit.
+         */
         function visitForOfStatement(node) {
             var savedEnclosingBlockScopedContainer = enclosingBlockScopedContainer;
             enclosingBlockScopedContainer = node;
@@ -57205,16 +73793,27 @@ var ts;
             enclosingBlockScopedContainer = savedEnclosingBlockScopedContainer;
             return node;
         }
+        /**
+         * Determines whether to hoist the initializer of a ForStatement, ForInStatement, or
+         * ForOfStatement.
+         *
+         * @param node The node to test.
+         */
         function shouldHoistForInitializer(node) {
             return ts.isVariableDeclarationList(node)
                 && shouldHoistVariableDeclarationList(node);
         }
+        /**
+         * Visits the initializer of a ForStatement, ForInStatement, or ForOfStatement
+         *
+         * @param node The node to visit.
+         */
         function visitForInitializer(node) {
             if (shouldHoistForInitializer(node)) {
                 var expressions = void 0;
                 for (var _i = 0, _a = node.declarations; _i < _a.length; _i++) {
                     var variable = _a[_i];
-                    expressions = ts.append(expressions, transformInitializedVariable(variable, false));
+                    expressions = ts.append(expressions, transformInitializedVariable(variable, /*isExportedDeclaration*/ false));
                     if (!variable.initializer) {
                         hoistBindingElement(variable);
                     }
@@ -57225,21 +73824,51 @@ var ts;
                 return ts.visitEachChild(node, nestedElementVisitor, context);
             }
         }
+        /**
+         * Visits the body of a DoStatement to hoist declarations.
+         *
+         * @param node The node to visit.
+         */
         function visitDoStatement(node) {
             return ts.updateDo(node, ts.visitNode(node.statement, nestedElementVisitor, ts.isStatement, ts.liftToBlock), ts.visitNode(node.expression, destructuringAndImportCallVisitor, ts.isExpression));
         }
+        /**
+         * Visits the body of a WhileStatement to hoist declarations.
+         *
+         * @param node The node to visit.
+         */
         function visitWhileStatement(node) {
             return ts.updateWhile(node, ts.visitNode(node.expression, destructuringAndImportCallVisitor, ts.isExpression), ts.visitNode(node.statement, nestedElementVisitor, ts.isStatement, ts.liftToBlock));
         }
+        /**
+         * Visits the body of a LabeledStatement to hoist declarations.
+         *
+         * @param node The node to visit.
+         */
         function visitLabeledStatement(node) {
             return ts.updateLabel(node, node.label, ts.visitNode(node.statement, nestedElementVisitor, ts.isStatement, ts.liftToBlock));
         }
+        /**
+         * Visits the body of a WithStatement to hoist declarations.
+         *
+         * @param node The node to visit.
+         */
         function visitWithStatement(node) {
             return ts.updateWith(node, ts.visitNode(node.expression, destructuringAndImportCallVisitor, ts.isExpression), ts.visitNode(node.statement, nestedElementVisitor, ts.isStatement, ts.liftToBlock));
         }
+        /**
+         * Visits the body of a SwitchStatement to hoist declarations.
+         *
+         * @param node The node to visit.
+         */
         function visitSwitchStatement(node) {
             return ts.updateSwitch(node, ts.visitNode(node.expression, destructuringAndImportCallVisitor, ts.isExpression), ts.visitNode(node.caseBlock, nestedElementVisitor, ts.isCaseBlock));
         }
+        /**
+         * Visits the body of a CaseBlock to hoist declarations.
+         *
+         * @param node The node to visit.
+         */
         function visitCaseBlock(node) {
             var savedEnclosingBlockScopedContainer = enclosingBlockScopedContainer;
             enclosingBlockScopedContainer = node;
@@ -57247,15 +73876,35 @@ var ts;
             enclosingBlockScopedContainer = savedEnclosingBlockScopedContainer;
             return node;
         }
+        /**
+         * Visits the body of a CaseClause to hoist declarations.
+         *
+         * @param node The node to visit.
+         */
         function visitCaseClause(node) {
             return ts.updateCaseClause(node, ts.visitNode(node.expression, destructuringAndImportCallVisitor, ts.isExpression), ts.visitNodes(node.statements, nestedElementVisitor, ts.isStatement));
         }
+        /**
+         * Visits the body of a DefaultClause to hoist declarations.
+         *
+         * @param node The node to visit.
+         */
         function visitDefaultClause(node) {
             return ts.visitEachChild(node, nestedElementVisitor, context);
         }
+        /**
+         * Visits the body of a TryStatement to hoist declarations.
+         *
+         * @param node The node to visit.
+         */
         function visitTryStatement(node) {
             return ts.visitEachChild(node, nestedElementVisitor, context);
         }
+        /**
+         * Visits the body of a CatchClause to hoist declarations.
+         *
+         * @param node The node to visit.
+         */
         function visitCatchClause(node) {
             var savedEnclosingBlockScopedContainer = enclosingBlockScopedContainer;
             enclosingBlockScopedContainer = node;
@@ -57263,6 +73912,11 @@ var ts;
             enclosingBlockScopedContainer = savedEnclosingBlockScopedContainer;
             return node;
         }
+        /**
+         * Visits the body of a Block to hoist declarations.
+         *
+         * @param node The node to visit.
+         */
         function visitBlock(node) {
             var savedEnclosingBlockScopedContainer = enclosingBlockScopedContainer;
             enclosingBlockScopedContainer = node;
@@ -57270,15 +73924,23 @@ var ts;
             enclosingBlockScopedContainer = savedEnclosingBlockScopedContainer;
             return node;
         }
+        //
+        // Destructuring Assignment Visitors
+        //
+        /**
+         * Visit nodes to flatten destructuring assignments to exported symbols.
+         *
+         * @param node The node to visit.
+         */
         function destructuringAndImportCallVisitor(node) {
-            if (node.transformFlags & 1024
-                && node.kind === 200) {
+            if (node.transformFlags & 1024 /* DestructuringAssignment */
+                && node.kind === 200 /* BinaryExpression */) {
                 return visitDestructuringAssignment(node);
             }
             else if (ts.isImportCall(node)) {
                 return visitImportCallExpression(node);
             }
-            else if ((node.transformFlags & 2048) || (node.transformFlags & 67108864)) {
+            else if ((node.transformFlags & 2048 /* ContainsDestructuringAssignment */) || (node.transformFlags & 67108864 /* ContainsDynamicImport */)) {
                 return ts.visitEachChild(node, destructuringAndImportCallVisitor, context);
             }
             else {
@@ -57286,16 +73948,38 @@ var ts;
             }
         }
         function visitImportCallExpression(node) {
-            return ts.createCall(ts.createPropertyAccess(contextObject, ts.createIdentifier("import")), undefined, ts.some(node.arguments) ? [ts.visitNode(node.arguments[0], destructuringAndImportCallVisitor)] : []);
+            // import("./blah")
+            // emit as
+            // System.register([], function (_export, _context) {
+            //     return {
+            //         setters: [],
+            //         execute: () => {
+            //             _context.import('./blah');
+            //         }
+            //     };
+            // });
+            return ts.createCall(ts.createPropertyAccess(contextObject, ts.createIdentifier("import")), 
+            /*typeArguments*/ undefined, ts.some(node.arguments) ? [ts.visitNode(node.arguments[0], destructuringAndImportCallVisitor)] : []);
         }
+        /**
+         * Visits a DestructuringAssignment to flatten destructuring to exported symbols.
+         *
+         * @param node The node to visit.
+         */
         function visitDestructuringAssignment(node) {
             if (hasExportedReferenceInDestructuringTarget(node.left)) {
-                return ts.flattenDestructuringAssignment(node, destructuringAndImportCallVisitor, context, 0, true);
+                return ts.flattenDestructuringAssignment(node, destructuringAndImportCallVisitor, context, 0 /* All */, 
+                /*needsValue*/ true);
             }
             return ts.visitEachChild(node, destructuringAndImportCallVisitor, context);
         }
+        /**
+         * Determines whether the target of a destructuring assigment refers to an exported symbol.
+         *
+         * @param node The destructuring target.
+         */
         function hasExportedReferenceInDestructuringTarget(node) {
-            if (ts.isAssignmentExpression(node, true)) {
+            if (ts.isAssignmentExpression(node, /*excludeCompoundAssignment*/ true)) {
                 return hasExportedReferenceInDestructuringTarget(node.left);
             }
             else if (ts.isSpreadElement(node)) {
@@ -57315,22 +73999,40 @@ var ts;
             }
             else if (ts.isIdentifier(node)) {
                 var container = resolver.getReferencedExportContainer(node);
-                return container !== undefined && container.kind === 274;
+                return container !== undefined && container.kind === 274 /* SourceFile */;
             }
             else {
                 return false;
             }
         }
+        //
+        // Modifier Visitors
+        //
+        /**
+         * Visit nodes to elide module-specific modifiers.
+         *
+         * @param node The node to visit.
+         */
         function modifierVisitor(node) {
             switch (node.kind) {
-                case 84:
-                case 79:
+                case 84 /* ExportKeyword */:
+                case 79 /* DefaultKeyword */:
                     return undefined;
             }
             return node;
         }
+        //
+        // Emit Notification
+        //
+        /**
+         * Hook for node emit notifications.
+         *
+         * @param hint A hint as to the intended usage of the node.
+         * @param node The node to emit.
+         * @param emitCallback A callback used to emit the node in the printer.
+         */
         function onEmitNode(hint, node, emitCallback) {
-            if (node.kind === 274) {
+            if (node.kind === 274 /* SourceFile */) {
                 var id = ts.getOriginalNodeId(node);
                 currentSourceFile = node;
                 moduleInfo = moduleInfoMap[id];
@@ -57349,75 +74051,127 @@ var ts;
                 previousOnEmitNode(hint, node, emitCallback);
             }
         }
+        //
+        // Substitutions
+        //
+        /**
+         * Hooks node substitutions.
+         *
+         * @param hint A hint as to the intended usage of the node.
+         * @param node The node to substitute.
+         */
         function onSubstituteNode(hint, node) {
             node = previousOnSubstituteNode(hint, node);
             if (isSubstitutionPrevented(node)) {
                 return node;
             }
-            if (hint === 1) {
+            if (hint === 1 /* Expression */) {
                 return substituteExpression(node);
             }
-            else if (hint === 4) {
+            else if (hint === 4 /* Unspecified */) {
                 return substituteUnspecified(node);
             }
             return node;
         }
+        /**
+         * Substitute the node, if necessary.
+         *
+         * @param node The node to substitute.
+         */
         function substituteUnspecified(node) {
             switch (node.kind) {
-                case 271:
+                case 271 /* ShorthandPropertyAssignment */:
                     return substituteShorthandPropertyAssignment(node);
             }
             return node;
         }
+        /**
+         * Substitution for a ShorthandPropertyAssignment whose name that may contain an imported or exported symbol.
+         *
+         * @param node The node to substitute.
+         */
         function substituteShorthandPropertyAssignment(node) {
             var name = node.name;
             if (!ts.isGeneratedIdentifier(name) && !ts.isLocalName(name)) {
                 var importDeclaration = resolver.getReferencedImportDeclaration(name);
                 if (importDeclaration) {
                     if (ts.isImportClause(importDeclaration)) {
-                        return ts.setTextRange(ts.createPropertyAssignment(ts.getSynthesizedClone(name), ts.createPropertyAccess(ts.getGeneratedNameForNode(importDeclaration.parent), ts.createIdentifier("default"))), node);
+                        return ts.setTextRange(ts.createPropertyAssignment(ts.getSynthesizedClone(name), ts.createPropertyAccess(ts.getGeneratedNameForNode(importDeclaration.parent), ts.createIdentifier("default"))), 
+                        /*location*/ node);
                     }
                     else if (ts.isImportSpecifier(importDeclaration)) {
-                        return ts.setTextRange(ts.createPropertyAssignment(ts.getSynthesizedClone(name), ts.createPropertyAccess(ts.getGeneratedNameForNode(importDeclaration.parent.parent.parent), ts.getSynthesizedClone(importDeclaration.propertyName || importDeclaration.name))), node);
+                        return ts.setTextRange(ts.createPropertyAssignment(ts.getSynthesizedClone(name), ts.createPropertyAccess(ts.getGeneratedNameForNode(importDeclaration.parent.parent.parent), ts.getSynthesizedClone(importDeclaration.propertyName || importDeclaration.name))), 
+                        /*location*/ node);
                     }
                 }
             }
             return node;
         }
+        /**
+         * Substitute the expression, if necessary.
+         *
+         * @param node The node to substitute.
+         */
         function substituteExpression(node) {
             switch (node.kind) {
-                case 71:
+                case 71 /* Identifier */:
                     return substituteExpressionIdentifier(node);
-                case 200:
+                case 200 /* BinaryExpression */:
                     return substituteBinaryExpression(node);
-                case 198:
-                case 199:
+                case 198 /* PrefixUnaryExpression */:
+                case 199 /* PostfixUnaryExpression */:
                     return substituteUnaryExpression(node);
             }
             return node;
         }
+        /**
+         * Substitution for an Identifier expression that may contain an imported or exported symbol.
+         *
+         * @param node The node to substitute.
+         */
         function substituteExpressionIdentifier(node) {
-            if (ts.getEmitFlags(node) & 4096) {
+            if (ts.getEmitFlags(node) & 4096 /* HelperName */) {
                 var externalHelpersModuleName = ts.getExternalHelpersModuleName(currentSourceFile);
                 if (externalHelpersModuleName) {
                     return ts.createPropertyAccess(externalHelpersModuleName, node);
                 }
                 return node;
             }
+            // When we see an identifier in an expression position that
+            // points to an imported symbol, we should substitute a qualified
+            // reference to the imported symbol if one is needed.
+            //
+            // - We do not substitute generated identifiers for any reason.
+            // - We do not substitute identifiers tagged with the LocalName flag.
             if (!ts.isGeneratedIdentifier(node) && !ts.isLocalName(node)) {
                 var importDeclaration = resolver.getReferencedImportDeclaration(node);
                 if (importDeclaration) {
                     if (ts.isImportClause(importDeclaration)) {
-                        return ts.setTextRange(ts.createPropertyAccess(ts.getGeneratedNameForNode(importDeclaration.parent), ts.createIdentifier("default")), node);
+                        return ts.setTextRange(ts.createPropertyAccess(ts.getGeneratedNameForNode(importDeclaration.parent), ts.createIdentifier("default")), 
+                        /*location*/ node);
                     }
                     else if (ts.isImportSpecifier(importDeclaration)) {
-                        return ts.setTextRange(ts.createPropertyAccess(ts.getGeneratedNameForNode(importDeclaration.parent.parent.parent), ts.getSynthesizedClone(importDeclaration.propertyName || importDeclaration.name)), node);
+                        return ts.setTextRange(ts.createPropertyAccess(ts.getGeneratedNameForNode(importDeclaration.parent.parent.parent), ts.getSynthesizedClone(importDeclaration.propertyName || importDeclaration.name)), 
+                        /*location*/ node);
                     }
                 }
             }
             return node;
         }
+        /**
+         * Substitution for a BinaryExpression that may contain an imported or exported symbol.
+         *
+         * @param node The node to substitute.
+         */
         function substituteBinaryExpression(node) {
+            // When we see an assignment expression whose left-hand side is an exported symbol,
+            // we should ensure all exports of that symbol are updated with the correct value.
+            //
+            // - We do not substitute generated identifiers for any reason.
+            // - We do not substitute identifiers tagged with the LocalName flag.
+            // - We do not substitute identifiers that were originally the name of an enum or
+            //   namespace due to how they are transformed in TypeScript.
+            // - We only substitute identifiers that are exported at the top level.
             if (ts.isAssignmentOperator(node.operatorToken.kind)
                 && ts.isIdentifier(node.left)
                 && !ts.isGeneratedIdentifier(node.left)
@@ -57425,6 +74179,7 @@ var ts;
                 && !ts.isDeclarationNameOfEnumOrNamespace(node.left)) {
                 var exportedNames = getExports(node.left);
                 if (exportedNames) {
+                    // For each additional export of the declaration, apply an export assignment.
                     var expression = node;
                     for (var _i = 0, exportedNames_4 = exportedNames; _i < exportedNames_4.length; _i++) {
                         var exportName = exportedNames_4[_i];
@@ -57435,23 +74190,37 @@ var ts;
             }
             return node;
         }
+        /**
+         * Substitution for a UnaryExpression that may contain an imported or exported symbol.
+         *
+         * @param node The node to substitute.
+         */
         function substituteUnaryExpression(node) {
-            if ((node.operator === 43 || node.operator === 44)
+            // When we see a prefix or postfix increment expression whose operand is an exported
+            // symbol, we should ensure all exports of that symbol are updated with the correct
+            // value.
+            //
+            // - We do not substitute generated identifiers for any reason.
+            // - We do not substitute identifiers tagged with the LocalName flag.
+            // - We do not substitute identifiers that were originally the name of an enum or
+            //   namespace due to how they are transformed in TypeScript.
+            // - We only substitute identifiers that are exported at the top level.
+            if ((node.operator === 43 /* PlusPlusToken */ || node.operator === 44 /* MinusMinusToken */)
                 && ts.isIdentifier(node.operand)
                 && !ts.isGeneratedIdentifier(node.operand)
                 && !ts.isLocalName(node.operand)
                 && !ts.isDeclarationNameOfEnumOrNamespace(node.operand)) {
                 var exportedNames = getExports(node.operand);
                 if (exportedNames) {
-                    var expression = node.kind === 199
+                    var expression = node.kind === 199 /* PostfixUnaryExpression */
                         ? ts.setTextRange(ts.createPrefix(node.operator, node.operand), node)
                         : node;
                     for (var _i = 0, exportedNames_5 = exportedNames; _i < exportedNames_5.length; _i++) {
                         var exportName = exportedNames_5[_i];
                         expression = createExportExpression(exportName, preventSubstitution(expression));
                     }
-                    if (node.kind === 199) {
-                        expression = node.operator === 43
+                    if (node.kind === 199 /* PostfixUnaryExpression */) {
+                        expression = node.operator === 43 /* PlusPlusToken */
                             ? ts.createSubtract(preventSubstitution(expression), ts.createLiteral(1))
                             : ts.createAdd(preventSubstitution(expression), ts.createLiteral(1));
                     }
@@ -57460,14 +74229,19 @@ var ts;
             }
             return node;
         }
+        /**
+         * Gets the exports of a name.
+         *
+         * @param name The name.
+         */
         function getExports(name) {
             var exportedNames;
             if (!ts.isGeneratedIdentifier(name)) {
                 var valueDeclaration = resolver.getReferencedImportDeclaration(name)
                     || resolver.getReferencedValueDeclaration(name);
                 if (valueDeclaration) {
-                    var exportContainer = resolver.getReferencedExportContainer(name, false);
-                    if (exportContainer && exportContainer.kind === 274) {
+                    var exportContainer = resolver.getReferencedExportContainer(name, /*prefixLocals*/ false);
+                    if (exportContainer && exportContainer.kind === 274 /* SourceFile */) {
                         exportedNames = ts.append(exportedNames, ts.getDeclarationName(valueDeclaration));
                     }
                     exportedNames = ts.addRange(exportedNames, moduleInfo && moduleInfo.exportedBindings[ts.getOriginalNodeId(valueDeclaration)]);
@@ -57475,18 +74249,29 @@ var ts;
             }
             return exportedNames;
         }
+        /**
+         * Prevent substitution of a node for this transformer.
+         *
+         * @param node The node which should not be substituted.
+         */
         function preventSubstitution(node) {
             if (noSubstitution === undefined)
                 noSubstitution = [];
             noSubstitution[ts.getNodeId(node)] = true;
             return node;
         }
+        /**
+         * Determines whether a node should not be substituted.
+         *
+         * @param node The node to test.
+         */
         function isSubstitutionPrevented(node) {
             return noSubstitution && node.id && noSubstitution[node.id];
         }
     }
     ts.transformSystemModule = transformSystemModule;
 })(ts || (ts = {}));
+/*@internal*/
 var ts;
 (function (ts) {
     function transformES2015Module(context) {
@@ -57495,8 +74280,8 @@ var ts;
         var previousOnSubstituteNode = context.onSubstituteNode;
         context.onEmitNode = onEmitNode;
         context.onSubstituteNode = onSubstituteNode;
-        context.enableEmitNotification(274);
-        context.enableSubstitution(71);
+        context.enableEmitNotification(274 /* SourceFile */);
+        context.enableSubstitution(71 /* Identifier */);
         var currentSourceFile;
         return ts.chainBundle(transformSourceFile);
         function transformSourceFile(node) {
@@ -57508,8 +74293,10 @@ var ts;
                 if (externalHelpersModuleName) {
                     var statements = [];
                     var statementOffset = ts.addPrologue(statements, node.statements);
-                    var tslibImport = ts.createImportDeclaration(undefined, undefined, ts.createImportClause(undefined, ts.createNamespaceImport(externalHelpersModuleName)), ts.createLiteral(ts.externalHelpersModuleNameText));
-                    ts.addEmitFlags(tslibImport, 67108864);
+                    var tslibImport = ts.createImportDeclaration(
+                    /*decorators*/ undefined, 
+                    /*modifiers*/ undefined, ts.createImportClause(/*name*/ undefined, ts.createNamespaceImport(externalHelpersModuleName)), ts.createLiteral(ts.externalHelpersModuleNameText));
+                    ts.addEmitFlags(tslibImport, 67108864 /* NeverApplyImportHelper */);
                     ts.append(statements, tslibImport);
                     ts.addRange(statements, ts.visitNodes(node.statements, visitor, ts.isStatement, statementOffset));
                     return ts.updateSourceFileNode(node, ts.setTextRange(ts.createNodeArray(statements), node.statements));
@@ -57522,16 +74309,28 @@ var ts;
         }
         function visitor(node) {
             switch (node.kind) {
-                case 243:
+                case 243 /* ImportEqualsDeclaration */:
+                    // Elide `import=` as it is not legal with --module ES6
                     return undefined;
-                case 249:
+                case 249 /* ExportAssignment */:
                     return visitExportAssignment(node);
             }
             return node;
         }
         function visitExportAssignment(node) {
+            // Elide `export=` as it is not legal with --module ES6
             return node.isExportEquals ? undefined : node;
         }
+        //
+        // Emit Notification
+        //
+        /**
+         * Hook for node emit.
+         *
+         * @param hint A hint as to the intended usage of the node.
+         * @param node The node to emit.
+         * @param emit A callback used to emit the node in the printer.
+         */
         function onEmitNode(hint, node, emitCallback) {
             if (ts.isSourceFile(node)) {
                 currentSourceFile = node;
@@ -57542,15 +74341,24 @@ var ts;
                 previousOnEmitNode(hint, node, emitCallback);
             }
         }
+        //
+        // Substitutions
+        //
+        /**
+         * Hooks node substitutions.
+         *
+         * @param hint A hint as to the intended usage of the node.
+         * @param node The node to substitute.
+         */
         function onSubstituteNode(hint, node) {
             node = previousOnSubstituteNode(hint, node);
-            if (ts.isIdentifier(node) && hint === 1) {
+            if (ts.isIdentifier(node) && hint === 1 /* Expression */) {
                 return substituteExpressionIdentifier(node);
             }
             return node;
         }
         function substituteExpressionIdentifier(node) {
-            if (ts.getEmitFlags(node) & 4096) {
+            if (ts.getEmitFlags(node) & 4096 /* HelperName */) {
                 var externalHelpersModuleName = ts.getExternalHelpersModuleName(currentSourceFile);
                 if (externalHelpersModuleName) {
                     return ts.createPropertyAccess(externalHelpersModuleName, node);
@@ -57561,6 +74369,7 @@ var ts;
     }
     ts.transformES2015Module = transformES2015Module;
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     function canProduceDiagnostics(node) {
@@ -57603,16 +74412,16 @@ var ts;
             } : undefined;
         }
         function getAccessorNameVisibilityDiagnosticMessage(symbolAccessibilityResult) {
-            if (ts.hasModifier(node, 32)) {
+            if (ts.hasModifier(node, 32 /* Static */)) {
                 return symbolAccessibilityResult.errorModuleName ?
-                    symbolAccessibilityResult.accessibility === 2 ?
+                    symbolAccessibilityResult.accessibility === 2 /* CannotBeNamed */ ?
                         ts.Diagnostics.Public_static_property_0_of_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named :
                         ts.Diagnostics.Public_static_property_0_of_exported_class_has_or_is_using_name_1_from_private_module_2 :
                     ts.Diagnostics.Public_static_property_0_of_exported_class_has_or_is_using_private_name_1;
             }
-            else if (node.parent.kind === 235) {
+            else if (node.parent.kind === 235 /* ClassDeclaration */) {
                 return symbolAccessibilityResult.errorModuleName ?
-                    symbolAccessibilityResult.accessibility === 2 ?
+                    symbolAccessibilityResult.accessibility === 2 /* CannotBeNamed */ ?
                         ts.Diagnostics.Public_property_0_of_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named :
                         ts.Diagnostics.Public_property_0_of_exported_class_has_or_is_using_name_1_from_private_module_2 :
                     ts.Diagnostics.Public_property_0_of_exported_class_has_or_is_using_private_name_1;
@@ -57632,16 +74441,16 @@ var ts;
             } : undefined;
         }
         function getMethodNameVisibilityDiagnosticMessage(symbolAccessibilityResult) {
-            if (ts.hasModifier(node, 32)) {
+            if (ts.hasModifier(node, 32 /* Static */)) {
                 return symbolAccessibilityResult.errorModuleName ?
-                    symbolAccessibilityResult.accessibility === 2 ?
+                    symbolAccessibilityResult.accessibility === 2 /* CannotBeNamed */ ?
                         ts.Diagnostics.Public_static_method_0_of_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named :
                         ts.Diagnostics.Public_static_method_0_of_exported_class_has_or_is_using_name_1_from_private_module_2 :
                     ts.Diagnostics.Public_static_method_0_of_exported_class_has_or_is_using_private_name_1;
             }
-            else if (node.parent.kind === 235) {
+            else if (node.parent.kind === 235 /* ClassDeclaration */) {
                 return symbolAccessibilityResult.errorModuleName ?
-                    symbolAccessibilityResult.accessibility === 2 ?
+                    symbolAccessibilityResult.accessibility === 2 /* CannotBeNamed */ ?
                         ts.Diagnostics.Public_method_0_of_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named :
                         ts.Diagnostics.Public_method_0_of_exported_class_has_or_is_using_name_1_from_private_module_2 :
                     ts.Diagnostics.Public_method_0_of_exported_class_has_or_is_using_private_name_1;
@@ -57665,7 +74474,7 @@ var ts;
             return getReturnTypeVisibilityError;
         }
         else if (ts.isParameter(node)) {
-            if (ts.isParameterPropertyDeclaration(node) && ts.hasModifier(node.parent, 8)) {
+            if (ts.isParameterPropertyDeclaration(node) && ts.hasModifier(node.parent, 8 /* Private */)) {
                 return getVariableDeclarationTypeVisibilityError;
             }
             return getParameterDeclarationTypeVisibilityError;
@@ -57686,30 +74495,34 @@ var ts;
             return ts.Debug.assertNever(node, "Attempted to set a declaration diagnostic context for unhandled node kind: " + ts.SyntaxKind[node.kind]);
         }
         function getVariableDeclarationTypeVisibilityDiagnosticMessage(symbolAccessibilityResult) {
-            if (node.kind === 232 || node.kind === 182) {
+            if (node.kind === 232 /* VariableDeclaration */ || node.kind === 182 /* BindingElement */) {
                 return symbolAccessibilityResult.errorModuleName ?
-                    symbolAccessibilityResult.accessibility === 2 ?
+                    symbolAccessibilityResult.accessibility === 2 /* CannotBeNamed */ ?
                         ts.Diagnostics.Exported_variable_0_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named :
                         ts.Diagnostics.Exported_variable_0_has_or_is_using_name_1_from_private_module_2 :
                     ts.Diagnostics.Exported_variable_0_has_or_is_using_private_name_1;
             }
-            else if (node.kind === 152 || node.kind === 151 ||
-                (node.kind === 149 && ts.hasModifier(node.parent, 8))) {
-                if (ts.hasModifier(node, 32)) {
+            // This check is to ensure we don't report error on constructor parameter property as that error would be reported during parameter emit
+            // The only exception here is if the constructor was marked as private. we are not emitting the constructor parameters at all.
+            else if (node.kind === 152 /* PropertyDeclaration */ || node.kind === 151 /* PropertySignature */ ||
+                (node.kind === 149 /* Parameter */ && ts.hasModifier(node.parent, 8 /* Private */))) {
+                // TODO(jfreeman): Deal with computed properties in error reporting.
+                if (ts.hasModifier(node, 32 /* Static */)) {
                     return symbolAccessibilityResult.errorModuleName ?
-                        symbolAccessibilityResult.accessibility === 2 ?
+                        symbolAccessibilityResult.accessibility === 2 /* CannotBeNamed */ ?
                             ts.Diagnostics.Public_static_property_0_of_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named :
                             ts.Diagnostics.Public_static_property_0_of_exported_class_has_or_is_using_name_1_from_private_module_2 :
                         ts.Diagnostics.Public_static_property_0_of_exported_class_has_or_is_using_private_name_1;
                 }
-                else if (node.parent.kind === 235 || node.kind === 149) {
+                else if (node.parent.kind === 235 /* ClassDeclaration */ || node.kind === 149 /* Parameter */) {
                     return symbolAccessibilityResult.errorModuleName ?
-                        symbolAccessibilityResult.accessibility === 2 ?
+                        symbolAccessibilityResult.accessibility === 2 /* CannotBeNamed */ ?
                             ts.Diagnostics.Public_property_0_of_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named :
                             ts.Diagnostics.Public_property_0_of_exported_class_has_or_is_using_name_1_from_private_module_2 :
                         ts.Diagnostics.Public_property_0_of_exported_class_has_or_is_using_private_name_1;
                 }
                 else {
+                    // Interfaces cannot have types that cannot be named
                     return symbolAccessibilityResult.errorModuleName ?
                         ts.Diagnostics.Property_0_of_exported_interface_has_or_is_using_name_1_from_private_module_2 :
                         ts.Diagnostics.Property_0_of_exported_interface_has_or_is_using_private_name_1;
@@ -57726,8 +74539,10 @@ var ts;
         }
         function getAccessorDeclarationTypeVisibilityError(symbolAccessibilityResult) {
             var diagnosticMessage;
-            if (node.kind === 157) {
-                if (ts.hasModifier(node, 32)) {
+            if (node.kind === 157 /* SetAccessor */) {
+                // Getters can infer the return type from the returned expression, but setters cannot, so the
+                // "_from_external_module_1_but_cannot_be_named" case cannot occur.
+                if (ts.hasModifier(node, 32 /* Static */)) {
                     diagnosticMessage = symbolAccessibilityResult.errorModuleName ?
                         ts.Diagnostics.Parameter_type_of_public_static_setter_0_from_exported_class_has_or_is_using_name_1_from_private_module_2 :
                         ts.Diagnostics.Parameter_type_of_public_static_setter_0_from_exported_class_has_or_is_using_private_name_1;
@@ -57739,16 +74554,16 @@ var ts;
                 }
             }
             else {
-                if (ts.hasModifier(node, 32)) {
+                if (ts.hasModifier(node, 32 /* Static */)) {
                     diagnosticMessage = symbolAccessibilityResult.errorModuleName ?
-                        symbolAccessibilityResult.accessibility === 2 ?
+                        symbolAccessibilityResult.accessibility === 2 /* CannotBeNamed */ ?
                             ts.Diagnostics.Return_type_of_public_static_getter_0_from_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named :
                             ts.Diagnostics.Return_type_of_public_static_getter_0_from_exported_class_has_or_is_using_name_1_from_private_module_2 :
                         ts.Diagnostics.Return_type_of_public_static_getter_0_from_exported_class_has_or_is_using_private_name_1;
                 }
                 else {
                     diagnosticMessage = symbolAccessibilityResult.errorModuleName ?
-                        symbolAccessibilityResult.accessibility === 2 ?
+                        symbolAccessibilityResult.accessibility === 2 /* CannotBeNamed */ ?
                             ts.Diagnostics.Return_type_of_public_getter_0_from_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named :
                             ts.Diagnostics.Return_type_of_public_getter_0_from_exported_class_has_or_is_using_name_1_from_private_module_2 :
                         ts.Diagnostics.Return_type_of_public_getter_0_from_exported_class_has_or_is_using_private_name_1;
@@ -57763,46 +74578,50 @@ var ts;
         function getReturnTypeVisibilityError(symbolAccessibilityResult) {
             var diagnosticMessage;
             switch (node.kind) {
-                case 159:
+                case 159 /* ConstructSignature */:
+                    // Interfaces cannot have return types that cannot be named
                     diagnosticMessage = symbolAccessibilityResult.errorModuleName ?
                         ts.Diagnostics.Return_type_of_constructor_signature_from_exported_interface_has_or_is_using_name_0_from_private_module_1 :
                         ts.Diagnostics.Return_type_of_constructor_signature_from_exported_interface_has_or_is_using_private_name_0;
                     break;
-                case 158:
+                case 158 /* CallSignature */:
+                    // Interfaces cannot have return types that cannot be named
                     diagnosticMessage = symbolAccessibilityResult.errorModuleName ?
                         ts.Diagnostics.Return_type_of_call_signature_from_exported_interface_has_or_is_using_name_0_from_private_module_1 :
                         ts.Diagnostics.Return_type_of_call_signature_from_exported_interface_has_or_is_using_private_name_0;
                     break;
-                case 160:
+                case 160 /* IndexSignature */:
+                    // Interfaces cannot have return types that cannot be named
                     diagnosticMessage = symbolAccessibilityResult.errorModuleName ?
                         ts.Diagnostics.Return_type_of_index_signature_from_exported_interface_has_or_is_using_name_0_from_private_module_1 :
                         ts.Diagnostics.Return_type_of_index_signature_from_exported_interface_has_or_is_using_private_name_0;
                     break;
-                case 154:
-                case 153:
-                    if (ts.hasModifier(node, 32)) {
+                case 154 /* MethodDeclaration */:
+                case 153 /* MethodSignature */:
+                    if (ts.hasModifier(node, 32 /* Static */)) {
                         diagnosticMessage = symbolAccessibilityResult.errorModuleName ?
-                            symbolAccessibilityResult.accessibility === 2 ?
+                            symbolAccessibilityResult.accessibility === 2 /* CannotBeNamed */ ?
                                 ts.Diagnostics.Return_type_of_public_static_method_from_exported_class_has_or_is_using_name_0_from_external_module_1_but_cannot_be_named :
                                 ts.Diagnostics.Return_type_of_public_static_method_from_exported_class_has_or_is_using_name_0_from_private_module_1 :
                             ts.Diagnostics.Return_type_of_public_static_method_from_exported_class_has_or_is_using_private_name_0;
                     }
-                    else if (node.parent.kind === 235) {
+                    else if (node.parent.kind === 235 /* ClassDeclaration */) {
                         diagnosticMessage = symbolAccessibilityResult.errorModuleName ?
-                            symbolAccessibilityResult.accessibility === 2 ?
+                            symbolAccessibilityResult.accessibility === 2 /* CannotBeNamed */ ?
                                 ts.Diagnostics.Return_type_of_public_method_from_exported_class_has_or_is_using_name_0_from_external_module_1_but_cannot_be_named :
                                 ts.Diagnostics.Return_type_of_public_method_from_exported_class_has_or_is_using_name_0_from_private_module_1 :
                             ts.Diagnostics.Return_type_of_public_method_from_exported_class_has_or_is_using_private_name_0;
                     }
                     else {
+                        // Interfaces cannot have return types that cannot be named
                         diagnosticMessage = symbolAccessibilityResult.errorModuleName ?
                             ts.Diagnostics.Return_type_of_method_from_exported_interface_has_or_is_using_name_0_from_private_module_1 :
                             ts.Diagnostics.Return_type_of_method_from_exported_interface_has_or_is_using_private_name_0;
                     }
                     break;
-                case 234:
+                case 234 /* FunctionDeclaration */:
                     diagnosticMessage = symbolAccessibilityResult.errorModuleName ?
-                        symbolAccessibilityResult.accessibility === 2 ?
+                        symbolAccessibilityResult.accessibility === 2 /* CannotBeNamed */ ?
                             ts.Diagnostics.Return_type_of_exported_function_has_or_is_using_name_0_from_external_module_1_but_cannot_be_named :
                             ts.Diagnostics.Return_type_of_exported_function_has_or_is_using_name_0_from_private_module_1 :
                         ts.Diagnostics.Return_type_of_exported_function_has_or_is_using_private_name_0;
@@ -57825,50 +74644,54 @@ var ts;
         }
         function getParameterDeclarationTypeVisibilityDiagnosticMessage(symbolAccessibilityResult) {
             switch (node.parent.kind) {
-                case 155:
+                case 155 /* Constructor */:
                     return symbolAccessibilityResult.errorModuleName ?
-                        symbolAccessibilityResult.accessibility === 2 ?
+                        symbolAccessibilityResult.accessibility === 2 /* CannotBeNamed */ ?
                             ts.Diagnostics.Parameter_0_of_constructor_from_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named :
                             ts.Diagnostics.Parameter_0_of_constructor_from_exported_class_has_or_is_using_name_1_from_private_module_2 :
                         ts.Diagnostics.Parameter_0_of_constructor_from_exported_class_has_or_is_using_private_name_1;
-                case 159:
-                case 164:
+                case 159 /* ConstructSignature */:
+                case 164 /* ConstructorType */:
+                    // Interfaces cannot have parameter types that cannot be named
                     return symbolAccessibilityResult.errorModuleName ?
                         ts.Diagnostics.Parameter_0_of_constructor_signature_from_exported_interface_has_or_is_using_name_1_from_private_module_2 :
                         ts.Diagnostics.Parameter_0_of_constructor_signature_from_exported_interface_has_or_is_using_private_name_1;
-                case 158:
+                case 158 /* CallSignature */:
+                    // Interfaces cannot have parameter types that cannot be named
                     return symbolAccessibilityResult.errorModuleName ?
                         ts.Diagnostics.Parameter_0_of_call_signature_from_exported_interface_has_or_is_using_name_1_from_private_module_2 :
                         ts.Diagnostics.Parameter_0_of_call_signature_from_exported_interface_has_or_is_using_private_name_1;
-                case 160:
+                case 160 /* IndexSignature */:
+                    // Interfaces cannot have parameter types that cannot be named
                     return symbolAccessibilityResult.errorModuleName ?
                         ts.Diagnostics.Parameter_0_of_index_signature_from_exported_interface_has_or_is_using_name_1_from_private_module_2 :
                         ts.Diagnostics.Parameter_0_of_index_signature_from_exported_interface_has_or_is_using_private_name_1;
-                case 154:
-                case 153:
-                    if (ts.hasModifier(node.parent, 32)) {
+                case 154 /* MethodDeclaration */:
+                case 153 /* MethodSignature */:
+                    if (ts.hasModifier(node.parent, 32 /* Static */)) {
                         return symbolAccessibilityResult.errorModuleName ?
-                            symbolAccessibilityResult.accessibility === 2 ?
+                            symbolAccessibilityResult.accessibility === 2 /* CannotBeNamed */ ?
                                 ts.Diagnostics.Parameter_0_of_public_static_method_from_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named :
                                 ts.Diagnostics.Parameter_0_of_public_static_method_from_exported_class_has_or_is_using_name_1_from_private_module_2 :
                             ts.Diagnostics.Parameter_0_of_public_static_method_from_exported_class_has_or_is_using_private_name_1;
                     }
-                    else if (node.parent.parent.kind === 235) {
+                    else if (node.parent.parent.kind === 235 /* ClassDeclaration */) {
                         return symbolAccessibilityResult.errorModuleName ?
-                            symbolAccessibilityResult.accessibility === 2 ?
+                            symbolAccessibilityResult.accessibility === 2 /* CannotBeNamed */ ?
                                 ts.Diagnostics.Parameter_0_of_public_method_from_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named :
                                 ts.Diagnostics.Parameter_0_of_public_method_from_exported_class_has_or_is_using_name_1_from_private_module_2 :
                             ts.Diagnostics.Parameter_0_of_public_method_from_exported_class_has_or_is_using_private_name_1;
                     }
                     else {
+                        // Interfaces cannot have parameter types that cannot be named
                         return symbolAccessibilityResult.errorModuleName ?
                             ts.Diagnostics.Parameter_0_of_method_from_exported_interface_has_or_is_using_name_1_from_private_module_2 :
                             ts.Diagnostics.Parameter_0_of_method_from_exported_interface_has_or_is_using_private_name_1;
                     }
-                case 234:
-                case 163:
+                case 234 /* FunctionDeclaration */:
+                case 163 /* FunctionType */:
                     return symbolAccessibilityResult.errorModuleName ?
-                        symbolAccessibilityResult.accessibility === 2 ?
+                        symbolAccessibilityResult.accessibility === 2 /* CannotBeNamed */ ?
                             ts.Diagnostics.Parameter_0_of_exported_function_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named :
                             ts.Diagnostics.Parameter_0_of_exported_function_has_or_is_using_name_1_from_private_module_2 :
                         ts.Diagnostics.Parameter_0_of_exported_function_has_or_is_using_private_name_1;
@@ -57877,36 +74700,37 @@ var ts;
             }
         }
         function getTypeParameterConstraintVisibilityError() {
+            // Type parameter constraints are named by user so we should always be able to name it
             var diagnosticMessage;
             switch (node.parent.kind) {
-                case 235:
+                case 235 /* ClassDeclaration */:
                     diagnosticMessage = ts.Diagnostics.Type_parameter_0_of_exported_class_has_or_is_using_private_name_1;
                     break;
-                case 236:
+                case 236 /* InterfaceDeclaration */:
                     diagnosticMessage = ts.Diagnostics.Type_parameter_0_of_exported_interface_has_or_is_using_private_name_1;
                     break;
-                case 159:
+                case 159 /* ConstructSignature */:
                     diagnosticMessage = ts.Diagnostics.Type_parameter_0_of_constructor_signature_from_exported_interface_has_or_is_using_private_name_1;
                     break;
-                case 158:
+                case 158 /* CallSignature */:
                     diagnosticMessage = ts.Diagnostics.Type_parameter_0_of_call_signature_from_exported_interface_has_or_is_using_private_name_1;
                     break;
-                case 154:
-                case 153:
-                    if (ts.hasModifier(node.parent, 32)) {
+                case 154 /* MethodDeclaration */:
+                case 153 /* MethodSignature */:
+                    if (ts.hasModifier(node.parent, 32 /* Static */)) {
                         diagnosticMessage = ts.Diagnostics.Type_parameter_0_of_public_static_method_from_exported_class_has_or_is_using_private_name_1;
                     }
-                    else if (node.parent.parent.kind === 235) {
+                    else if (node.parent.parent.kind === 235 /* ClassDeclaration */) {
                         diagnosticMessage = ts.Diagnostics.Type_parameter_0_of_public_method_from_exported_class_has_or_is_using_private_name_1;
                     }
                     else {
                         diagnosticMessage = ts.Diagnostics.Type_parameter_0_of_method_from_exported_interface_has_or_is_using_private_name_1;
                     }
                     break;
-                case 234:
+                case 234 /* FunctionDeclaration */:
                     diagnosticMessage = ts.Diagnostics.Type_parameter_0_of_exported_function_has_or_is_using_private_name_1;
                     break;
-                case 237:
+                case 237 /* TypeAliasDeclaration */:
                     diagnosticMessage = ts.Diagnostics.Type_parameter_0_of_exported_type_alias_has_or_is_using_private_name_1;
                     break;
                 default:
@@ -57920,12 +74744,15 @@ var ts;
         }
         function getHeritageClauseVisibilityError() {
             var diagnosticMessage;
-            if (node.parent.parent.kind === 235) {
-                diagnosticMessage = node.parent.token === 108 ?
+            // Heritage clause is written by user so it can always be named
+            if (node.parent.parent.kind === 235 /* ClassDeclaration */) {
+                // Class or Interface implemented/extended is inaccessible
+                diagnosticMessage = node.parent.token === 108 /* ImplementsKeyword */ ?
                     ts.Diagnostics.Implements_clause_of_exported_class_0_has_or_is_using_private_name_1 :
                     ts.Diagnostics.extends_clause_of_exported_class_0_has_or_is_using_private_name_1;
             }
             else {
+                // interface is inaccessible
                 diagnosticMessage = ts.Diagnostics.extends_clause_of_exported_interface_0_has_or_is_using_private_name_1;
             }
             return {
@@ -57951,23 +74778,30 @@ var ts;
     }
     ts.createGetSymbolAccessibilityDiagnosticForNode = createGetSymbolAccessibilityDiagnosticForNode;
 })(ts || (ts = {}));
+/*@internal*/
 var ts;
 (function (ts) {
     function getDeclarationDiagnostics(host, resolver, file) {
         if (file && ts.isSourceFileJavaScript(file)) {
-            return [];
+            return []; // No declaration diagnostics for js for now
         }
         var compilerOptions = host.getCompilerOptions();
-        var result = ts.transformNodes(resolver, host, compilerOptions, file ? [file] : ts.filter(host.getSourceFiles(), ts.isSourceFileNotJavaScript), [transformDeclarations], false);
+        var result = ts.transformNodes(resolver, host, compilerOptions, file ? [file] : ts.filter(host.getSourceFiles(), ts.isSourceFileNotJavaScript), [transformDeclarations], /*allowDtsFiles*/ false);
         return result.diagnostics;
     }
     ts.getDeclarationDiagnostics = getDeclarationDiagnostics;
-    var declarationEmitNodeBuilderFlags = 1024 |
-        2048 |
-        4096 |
-        8 |
-        524288 |
-        4;
+    var declarationEmitNodeBuilderFlags = 1024 /* MultilineObjectLiterals */ |
+        2048 /* WriteClassExpressionAsTypeLiteral */ |
+        4096 /* UseTypeOfFunction */ |
+        8 /* UseStructuralFallback */ |
+        524288 /* AllowEmptyTuple */ |
+        4 /* GenerateNamesForShadowedTypeParams */;
+    /**
+     * Transforms a ts file into a .d.ts file
+     * This process requires type information, which is retrieved through the emit resolver. Because of this,
+     * in many places this transformer assumes it will be operating on parse tree nodes directly.
+     * This means that _no transforms should be allowed to occur before this one_.
+     */
     function transformDeclarations(context) {
         var throwDiagnostic = function () { return ts.Debug.fail("Diagnostic emitted without context"); };
         var getSymbolAccessibilityDiagnostic = throwDiagnostic;
@@ -58003,8 +74837,8 @@ var ts;
                 return;
             }
             necessaryTypeRefernces = necessaryTypeRefernces || ts.createMap();
-            for (var _i = 0, typeReferenceDirectives_2 = typeReferenceDirectives; _i < typeReferenceDirectives_2.length; _i++) {
-                var ref = typeReferenceDirectives_2[_i];
+            for (var _i = 0, typeReferenceDirectives_1 = typeReferenceDirectives; _i < typeReferenceDirectives_1.length; _i++) {
+                var ref = typeReferenceDirectives_1[_i];
                 necessaryTypeRefernces.set(ref, true);
             }
         }
@@ -58013,7 +74847,8 @@ var ts;
             refs.set("" + ts.getOriginalNodeId(container), container);
         }
         function handleSymbolAccessibilityError(symbolAccessibilityResult) {
-            if (symbolAccessibilityResult.accessibility === 0) {
+            if (symbolAccessibilityResult.accessibility === 0 /* Accessible */) {
+                // Add aliases back onto the possible imports list if they're not there so we can try them again with updated visibility info
                 if (symbolAccessibilityResult && symbolAccessibilityResult.aliasesToMakeVisible) {
                     if (!lateMarkedStatements) {
                         lateMarkedStatements = symbolAccessibilityResult.aliasesToMakeVisible;
@@ -58025,8 +74860,10 @@ var ts;
                         }
                     }
                 }
+                // TODO: Do all these accessibility checks inside/after the first pass in the checker when declarations are enabled, if possible
             }
             else {
+                // Report error
                 var errorInfo = getSymbolAccessibilityDiagnostic(symbolAccessibilityResult);
                 if (errorInfo) {
                     if (errorInfo.typeName) {
@@ -58039,9 +74876,9 @@ var ts;
             }
         }
         function trackSymbol(symbol, enclosingDeclaration, meaning) {
-            if (symbol.flags & 262144)
+            if (symbol.flags & 262144 /* TypeParameter */)
                 return;
-            handleSymbolAccessibilityError(resolver.isSymbolAccessible(symbol, enclosingDeclaration, meaning, true));
+            handleSymbolAccessibilityError(resolver.isSymbolAccessible(symbol, enclosingDeclaration, meaning, /*shouldComputeAliasesToMakeVisible*/ true));
             recordTypeReferenceDirectivesIfNecessary(resolver.getTypeReferenceDirectivesForSymbol(symbol, meaning));
         }
         function reportPrivateInBaseOfClassExpression(propertyName) {
@@ -58060,16 +74897,16 @@ var ts;
             }
         }
         function transformRoot(node) {
-            if (node.kind === 274 && (node.isDeclarationFile || ts.isSourceFileJavaScript(node))) {
+            if (node.kind === 274 /* SourceFile */ && (node.isDeclarationFile || ts.isSourceFileJavaScript(node))) {
                 return node;
             }
-            if (node.kind === 275) {
+            if (node.kind === 275 /* Bundle */) {
                 isBundledEmit = true;
                 var refs_1 = ts.createMap();
                 var hasNoDefaultLib_1 = false;
                 var bundle = ts.createBundle(ts.map(node.sourceFiles, function (sourceFile) {
                     if (sourceFile.isDeclarationFile || ts.isSourceFileJavaScript(sourceFile))
-                        return undefined;
+                        return undefined; // Omit declaration files from bundle results, too // TODO: GH#18217
                     hasNoDefaultLib_1 = hasNoDefaultLib_1 || sourceFile.hasNoDefaultLib;
                     currentSourceFile = sourceFile;
                     enclosingDeclaration = sourceFile;
@@ -58081,28 +74918,29 @@ var ts;
                     resultHasScopeMarker = false;
                     collectReferences(sourceFile, refs_1);
                     if (ts.isExternalModule(sourceFile)) {
-                        resultHasExternalModuleIndicator = false;
+                        resultHasExternalModuleIndicator = false; // unused in external module bundle emit (all external modules are within module blocks, therefore are known to be modules)
                         needsDeclare = false;
                         var statements_5 = ts.visitNodes(sourceFile.statements, visitDeclarationStatements);
-                        var newFile = ts.updateSourceFileNode(sourceFile, [ts.createModuleDeclaration([], [ts.createModifier(124)], ts.createLiteral(ts.getResolvedExternalModuleName(context.getEmitHost(), sourceFile)), ts.createModuleBlock(ts.setTextRange(ts.createNodeArray(transformAndReplaceLatePaintedStatements(statements_5)), sourceFile.statements)))], true, [], [], false);
+                        var newFile = ts.updateSourceFileNode(sourceFile, [ts.createModuleDeclaration([], [ts.createModifier(124 /* DeclareKeyword */)], ts.createLiteral(ts.getResolvedExternalModuleName(context.getEmitHost(), sourceFile)), ts.createModuleBlock(ts.setTextRange(ts.createNodeArray(transformAndReplaceLatePaintedStatements(statements_5)), sourceFile.statements)))], /*isDeclarationFile*/ true, /*referencedFiles*/ [], /*typeReferences*/ [], /*hasNoDefaultLib*/ false, /*libReferences*/ []);
                         return newFile;
                     }
                     needsDeclare = true;
                     var updated = ts.visitNodes(sourceFile.statements, visitDeclarationStatements);
-                    return ts.updateSourceFileNode(sourceFile, transformAndReplaceLatePaintedStatements(updated), true, [], [], false);
+                    return ts.updateSourceFileNode(sourceFile, transformAndReplaceLatePaintedStatements(updated), /*isDeclarationFile*/ true, /*referencedFiles*/ [], /*typeReferences*/ [], /*hasNoDefaultLib*/ false, /*libReferences*/ []);
                 }), ts.mapDefined(node.prepends, function (prepend) {
-                    if (prepend.kind === 277) {
-                        return ts.createUnparsedSourceFile(prepend.declarationText);
+                    if (prepend.kind === 277 /* InputFiles */) {
+                        return ts.createUnparsedSourceFile(prepend.declarationText, prepend.declarationMapText);
                     }
                 }));
                 bundle.syntheticFileReferences = [];
                 bundle.syntheticTypeReferences = getFileReferencesForUsedTypeReferences();
                 bundle.hasNoDefaultLib = hasNoDefaultLib_1;
-                var outputFilePath_1 = ts.getDirectoryPath(ts.normalizeSlashes(ts.getOutputPathsFor(node, host, true).declarationFilePath));
+                var outputFilePath_1 = ts.getDirectoryPath(ts.normalizeSlashes(ts.getOutputPathsFor(node, host, /*forceDtsPaths*/ true).declarationFilePath));
                 var referenceVisitor_1 = mapReferencesIntoArray(bundle.syntheticFileReferences, outputFilePath_1);
                 refs_1.forEach(referenceVisitor_1);
                 return bundle;
             }
+            // Single source file
             needsDeclare = true;
             needsScopeFixMarker = false;
             resultHasScopeMarker = false;
@@ -58117,21 +74955,22 @@ var ts;
             necessaryTypeRefernces = undefined;
             refs = collectReferences(currentSourceFile, ts.createMap());
             var references = [];
-            var outputFilePath = ts.getDirectoryPath(ts.normalizeSlashes(ts.getOutputPathsFor(node, host, true).declarationFilePath));
+            var outputFilePath = ts.getDirectoryPath(ts.normalizeSlashes(ts.getOutputPathsFor(node, host, /*forceDtsPaths*/ true).declarationFilePath));
             var referenceVisitor = mapReferencesIntoArray(references, outputFilePath);
             var statements = ts.visitNodes(node.statements, visitDeclarationStatements);
             var combinedStatements = ts.setTextRange(ts.createNodeArray(transformAndReplaceLatePaintedStatements(statements)), node.statements);
             refs.forEach(referenceVisitor);
             var emittedImports = ts.filter(combinedStatements, ts.isAnyImportSyntax);
             if (ts.isExternalModule(node) && (!resultHasExternalModuleIndicator || (needsScopeFixMarker && !resultHasScopeMarker))) {
-                combinedStatements = ts.setTextRange(ts.createNodeArray(combinedStatements.concat([ts.createExportDeclaration(undefined, undefined, ts.createNamedExports([]), undefined)])), combinedStatements);
+                combinedStatements = ts.setTextRange(ts.createNodeArray(combinedStatements.concat([ts.createExportDeclaration(/*decorators*/ undefined, /*modifiers*/ undefined, ts.createNamedExports([]), /*moduleSpecifier*/ undefined)])), combinedStatements);
             }
-            var updated = ts.updateSourceFileNode(node, combinedStatements, true, references, getFileReferencesForUsedTypeReferences(), node.hasNoDefaultLib);
+            var updated = ts.updateSourceFileNode(node, combinedStatements, /*isDeclarationFile*/ true, references, getFileReferencesForUsedTypeReferences(), node.hasNoDefaultLib);
             return updated;
             function getFileReferencesForUsedTypeReferences() {
                 return necessaryTypeRefernces ? ts.mapDefined(ts.arrayFrom(necessaryTypeRefernces.keys()), getFileReferenceForTypeName) : [];
             }
             function getFileReferenceForTypeName(typeName) {
+                // Elide type references for which we have imports
                 if (emittedImports) {
                     for (var _i = 0, emittedImports_1 = emittedImports; _i < emittedImports_1.length; _i++) {
                         var importStatement = emittedImports_1[_i];
@@ -58151,17 +74990,18 @@ var ts;
             function mapReferencesIntoArray(references, outputFilePath) {
                 return function (file) {
                     var declFileName;
-                    if (file.isDeclarationFile) {
+                    if (file.isDeclarationFile) { // Neither decl files or js should have their refs changed
                         declFileName = file.fileName;
                     }
                     else {
                         if (isBundledEmit && ts.contains(node.sourceFiles, file))
-                            return;
-                        var paths = ts.getOutputPathsFor(file, host, true);
+                            return; // Omit references to files which are being merged
+                        var paths = ts.getOutputPathsFor(file, host, /*forceDtsPaths*/ true);
                         declFileName = paths.declarationFilePath || paths.jsFilePath;
                     }
                     if (declFileName) {
-                        var fileName = ts.getRelativePathToDirectoryOrUrl(outputFilePath, declFileName, host.getCurrentDirectory(), host.getCanonicalFileName, false);
+                        var fileName = ts.getRelativePathToDirectoryOrUrl(outputFilePath, declFileName, host.getCurrentDirectory(), host.getCanonicalFileName, 
+                        /*isAbsolutePathAnUrl*/ false);
                         if (ts.startsWith(fileName, "./") && ts.hasExtension(fileName)) {
                             fileName = fileName.substring(2);
                         }
@@ -58182,11 +75022,11 @@ var ts;
             return ret;
         }
         function filterBindingPatternInitializers(name) {
-            if (name.kind === 71) {
+            if (name.kind === 71 /* Identifier */) {
                 return name;
             }
             else {
-                if (name.kind === 181) {
+                if (name.kind === 181 /* ArrayBindingPattern */) {
                     return ts.updateArrayBindingPattern(name, ts.visitNodes(name.elements, visitBindingElement));
                 }
                 else {
@@ -58194,7 +75034,7 @@ var ts;
                 }
             }
             function visitBindingElement(elem) {
-                if (elem.kind === 206) {
+                if (elem.kind === 206 /* OmittedExpression */) {
                     return elem;
                 }
                 return ts.updateBindingElement(elem, elem.dotDotDotToken, elem.propertyName, filterBindingPatternInitializers(elem.name), shouldPrintWithInitializer(elem) ? elem.initializer : undefined);
@@ -58206,39 +75046,45 @@ var ts;
                 oldDiag = getSymbolAccessibilityDiagnostic;
                 getSymbolAccessibilityDiagnostic = ts.createGetSymbolAccessibilityDiagnosticForNode(p);
             }
-            var newParam = ts.updateParameter(p, undefined, maskModifiers(p, modifierMask), p.dotDotDotToken, filterBindingPatternInitializers(p.name), resolver.isOptionalParameter(p) ? (p.questionToken || ts.createToken(55)) : undefined, ensureType(p, p.type, true), ensureNoInitializer(p));
+            var newParam = ts.updateParameter(p, 
+            /*decorators*/ undefined, maskModifiers(p, modifierMask), p.dotDotDotToken, filterBindingPatternInitializers(p.name), resolver.isOptionalParameter(p) ? (p.questionToken || ts.createToken(55 /* QuestionToken */)) : undefined, ensureType(p, p.type, /*ignorePrivate*/ true), // Ignore private param props, since this type is going straight back into a param
+            ensureNoInitializer(p));
             if (!suppressNewDiagnosticContexts) {
                 getSymbolAccessibilityDiagnostic = oldDiag;
             }
             return newParam;
         }
         function shouldPrintWithInitializer(node) {
-            return canHaveLiteralInitializer(node) && resolver.isLiteralConstDeclaration(ts.getParseTreeNode(node));
+            return canHaveLiteralInitializer(node) && resolver.isLiteralConstDeclaration(ts.getParseTreeNode(node)); // TODO: Make safe
         }
         function ensureNoInitializer(node) {
             if (shouldPrintWithInitializer(node)) {
-                return resolver.createLiteralConstValue(ts.getParseTreeNode(node));
+                return resolver.createLiteralConstValue(ts.getParseTreeNode(node)); // TODO: Make safe
             }
             return undefined;
         }
         function ensureType(node, type, ignorePrivate) {
-            if (!ignorePrivate && ts.hasModifier(node, 8)) {
+            if (!ignorePrivate && ts.hasModifier(node, 8 /* Private */)) {
+                // Private nodes emit no types (except private parameter properties, whose parameter types are actually visible)
                 return;
             }
             if (shouldPrintWithInitializer(node)) {
+                // Literal const declarations will have an initializer ensured rather than a type
                 return;
             }
-            var shouldUseResolverType = node.kind === 149 &&
+            var shouldUseResolverType = node.kind === 149 /* Parameter */ &&
                 (resolver.isRequiredInitializedParameter(node) ||
                     resolver.isOptionalUninitializedParameterProperty(node));
             if (type && !shouldUseResolverType) {
                 return ts.visitNode(type, visitDeclarationSubtree);
             }
             if (!ts.getParseTreeNode(node)) {
-                return type ? ts.visitNode(type, visitDeclarationSubtree) : ts.createKeywordTypeNode(119);
+                return type ? ts.visitNode(type, visitDeclarationSubtree) : ts.createKeywordTypeNode(119 /* AnyKeyword */);
             }
-            if (node.kind === 157) {
-                return ts.createKeywordTypeNode(119);
+            if (node.kind === 157 /* SetAccessor */) {
+                // Set accessors with no associated type node (from it's param or get accessor return) are `any` since they are never contextually typed right now
+                // (The inferred type here will be void, but the old declaration emitter printed `any`, so this replicates that)
+                return ts.createKeywordTypeNode(119 /* AnyKeyword */);
             }
             errorNameNode = node.name;
             var oldDiag;
@@ -58246,12 +75092,12 @@ var ts;
                 oldDiag = getSymbolAccessibilityDiagnostic;
                 getSymbolAccessibilityDiagnostic = ts.createGetSymbolAccessibilityDiagnosticForNode(node);
             }
-            if (node.kind === 232 || node.kind === 182) {
+            if (node.kind === 232 /* VariableDeclaration */ || node.kind === 182 /* BindingElement */) {
                 return cleanup(resolver.createTypeOfDeclaration(node, enclosingDeclaration, declarationEmitNodeBuilderFlags, symbolTracker));
             }
-            if (node.kind === 149
-                || node.kind === 152
-                || node.kind === 151) {
+            if (node.kind === 149 /* Parameter */
+                || node.kind === 152 /* PropertyDeclaration */
+                || node.kind === 151 /* PropertySignature */) {
                 if (!node.initializer)
                     return cleanup(resolver.createTypeOfDeclaration(node, enclosingDeclaration, declarationEmitNodeBuilderFlags, symbolTracker, shouldUseResolverType));
                 return cleanup(resolver.createTypeOfDeclaration(node, enclosingDeclaration, declarationEmitNodeBuilderFlags, symbolTracker, shouldUseResolverType) || resolver.createTypeOfExpression(node.initializer, enclosingDeclaration, declarationEmitNodeBuilderFlags, symbolTracker));
@@ -58262,25 +75108,26 @@ var ts;
                 if (!suppressNewDiagnosticContexts) {
                     getSymbolAccessibilityDiagnostic = oldDiag;
                 }
-                return returnValue || ts.createKeywordTypeNode(119);
+                return returnValue || ts.createKeywordTypeNode(119 /* AnyKeyword */);
             }
         }
         function isDeclarationAndNotVisible(node) {
             node = ts.getParseTreeNode(node);
             switch (node.kind) {
-                case 234:
-                case 239:
-                case 236:
-                case 235:
-                case 237:
-                case 238:
+                case 234 /* FunctionDeclaration */:
+                case 239 /* ModuleDeclaration */:
+                case 236 /* InterfaceDeclaration */:
+                case 235 /* ClassDeclaration */:
+                case 237 /* TypeAliasDeclaration */:
+                case 238 /* EnumDeclaration */:
                     return !resolver.isDeclarationVisible(node);
-                case 232:
+                // The following should be doing their own visibility checks based on filtering their members
+                case 232 /* VariableDeclaration */:
                     return !getBindingNameVisible(node);
-                case 243:
-                case 244:
-                case 250:
-                case 249:
+                case 243 /* ImportEqualsDeclaration */:
+                case 244 /* ImportDeclaration */:
+                case 250 /* ExportDeclaration */:
+                case 249 /* ExportAssignment */:
                     return false;
             }
             return false;
@@ -58290,6 +75137,7 @@ var ts;
                 return false;
             }
             if (ts.isBindingPattern(elem.name)) {
+                // If any child binding pattern element has been marked visible (usually by collect linked aliases), then this is visible
                 return ts.some(elem.name.elements, getBindingNameVisible);
             }
             else {
@@ -58297,17 +75145,17 @@ var ts;
             }
         }
         function updateParamsList(node, params, modifierMask) {
-            if (ts.hasModifier(node, 8)) {
-                return undefined;
+            if (ts.hasModifier(node, 8 /* Private */)) {
+                return undefined; // TODO: GH#18217
             }
             var newParams = ts.map(params, function (p) { return ensureParameter(p, modifierMask); });
             if (!newParams) {
-                return undefined;
+                return undefined; // TODO: GH#18217
             }
             return ts.createNodeArray(newParams, params.hasTrailingComma);
         }
         function ensureTypeParams(node, params) {
-            return ts.hasModifier(node, 8) ? undefined : ts.visitNodes(params, visitDeclarationSubtree);
+            return ts.hasModifier(node, 8 /* Private */) ? undefined : ts.visitNodes(params, visitDeclarationSubtree);
         }
         function isEnclosingDeclaration(node) {
             return ts.isSourceFile(node)
@@ -58332,9 +75180,9 @@ var ts;
         }
         function rewriteModuleSpecifier(parent, input) {
             if (!input)
-                return undefined;
-            resultHasExternalModuleIndicator = resultHasExternalModuleIndicator || (parent.kind !== 239 && parent.kind !== 179);
-            if (input.kind === 9 && isBundledEmit) {
+                return undefined; // TODO: GH#18217
+            resultHasExternalModuleIndicator = resultHasExternalModuleIndicator || (parent.kind !== 239 /* ModuleDeclaration */ && parent.kind !== 179 /* ImportType */);
+            if (input.kind === 9 /* StringLiteral */ && isBundledEmit) {
                 var newName = ts.getExternalModuleNameFromDeclaration(context.getEmitHost(), resolver, parent);
                 if (newName) {
                     return ts.createLiteral(newName);
@@ -58345,9 +75193,11 @@ var ts;
         function transformImportEqualsDeclaration(decl) {
             if (!resolver.isDeclarationVisible(decl))
                 return;
-            if (decl.moduleReference.kind === 254) {
+            if (decl.moduleReference.kind === 254 /* ExternalModuleReference */) {
+                // Rewrite external module names if necessary
                 var specifier = ts.getExternalModuleImportEqualsDeclarationExpression(decl);
-                return ts.updateImportEqualsDeclaration(decl, undefined, decl.modifiers, decl.name, ts.updateExternalModuleReference(decl.moduleReference, rewriteModuleSpecifier(decl, specifier)));
+                return ts.updateImportEqualsDeclaration(decl, 
+                /*decorators*/ undefined, decl.modifiers, decl.name, ts.updateExternalModuleReference(decl.moduleReference, rewriteModuleSpecifier(decl, specifier)));
             }
             else {
                 var oldDiag = getSymbolAccessibilityDiagnostic;
@@ -58359,30 +75209,55 @@ var ts;
         }
         function transformImportDeclaration(decl) {
             if (!decl.importClause) {
-                return ts.updateImportDeclaration(decl, undefined, decl.modifiers, decl.importClause, rewriteModuleSpecifier(decl, decl.moduleSpecifier));
+                // import "mod" - possibly needed for side effects? (global interface patches, module augmentations, etc)
+                return ts.updateImportDeclaration(decl, 
+                /*decorators*/ undefined, decl.modifiers, decl.importClause, rewriteModuleSpecifier(decl, decl.moduleSpecifier));
             }
+            // The `importClause` visibility corresponds to the default's visibility.
             var visibleDefaultBinding = decl.importClause && decl.importClause.name && resolver.isDeclarationVisible(decl.importClause) ? decl.importClause.name : undefined;
             if (!decl.importClause.namedBindings) {
-                return visibleDefaultBinding && ts.updateImportDeclaration(decl, undefined, decl.modifiers, ts.updateImportClause(decl.importClause, visibleDefaultBinding, undefined), rewriteModuleSpecifier(decl, decl.moduleSpecifier));
+                // No named bindings (either namespace or list), meaning the import is just default or should be elided
+                return visibleDefaultBinding && ts.updateImportDeclaration(decl, /*decorators*/ undefined, decl.modifiers, ts.updateImportClause(decl.importClause, visibleDefaultBinding, 
+                /*namedBindings*/ undefined), rewriteModuleSpecifier(decl, decl.moduleSpecifier));
             }
-            if (decl.importClause.namedBindings.kind === 246) {
-                var namedBindings = resolver.isDeclarationVisible(decl.importClause.namedBindings) ? decl.importClause.namedBindings : undefined;
-                return visibleDefaultBinding || namedBindings ? ts.updateImportDeclaration(decl, undefined, decl.modifiers, ts.updateImportClause(decl.importClause, visibleDefaultBinding, namedBindings), rewriteModuleSpecifier(decl, decl.moduleSpecifier)) : undefined;
+            if (decl.importClause.namedBindings.kind === 246 /* NamespaceImport */) {
+                // Namespace import (optionally with visible default)
+                var namedBindings = resolver.isDeclarationVisible(decl.importClause.namedBindings) ? decl.importClause.namedBindings : /*namedBindings*/ undefined;
+                return visibleDefaultBinding || namedBindings ? ts.updateImportDeclaration(decl, /*decorators*/ undefined, decl.modifiers, ts.updateImportClause(decl.importClause, visibleDefaultBinding, namedBindings), rewriteModuleSpecifier(decl, decl.moduleSpecifier)) : undefined;
             }
+            // Named imports (optionally with visible default)
             var bindingList = ts.mapDefined(decl.importClause.namedBindings.elements, function (b) { return resolver.isDeclarationVisible(b) ? b : undefined; });
             if ((bindingList && bindingList.length) || visibleDefaultBinding) {
-                return ts.updateImportDeclaration(decl, undefined, decl.modifiers, ts.updateImportClause(decl.importClause, visibleDefaultBinding, bindingList && bindingList.length ? ts.updateNamedImports(decl.importClause.namedBindings, bindingList) : undefined), rewriteModuleSpecifier(decl, decl.moduleSpecifier));
+                return ts.updateImportDeclaration(decl, 
+                /*decorators*/ undefined, decl.modifiers, ts.updateImportClause(decl.importClause, visibleDefaultBinding, bindingList && bindingList.length ? ts.updateNamedImports(decl.importClause.namedBindings, bindingList) : undefined), rewriteModuleSpecifier(decl, decl.moduleSpecifier));
             }
+            // Nothing visible
         }
         function transformAndReplaceLatePaintedStatements(statements) {
+            // This is a `while` loop because `handleSymbolAccessibilityError` can see additional import aliases marked as visible during
+            // error handling which must now be included in the output and themselves checked for errors.
+            // For example:
+            // ```
+            // module A {
+            //   export module Q {}
+            //   import B = Q;
+            //   import C = B;
+            //   export import D = C;
+            // }
+            // ```
+            // In such a scenario, only Q and D are initially visible, but we don't consider imports as private names - instead we say they if they are referenced they must
+            // be recorded. So while checking D's visibility we mark C as visible, then we must check C which in turn marks B, completing the chain of
+            // dependent imports and allowing a valid declaration file output. Today, this dependent alias marking only happens for internal import aliases.
             while (ts.length(lateMarkedStatements)) {
                 var i = lateMarkedStatements.shift();
                 if (!ts.isLateVisibilityPaintedStatement(i)) {
                     return ts.Debug.fail("Late replaced statement was found which is not handled by the declaration transformer!: " + (ts.SyntaxKind ? ts.SyntaxKind[i.kind] : i.kind));
                 }
-                var result = transformTopLevelDeclaration(i, true);
+                var result = transformTopLevelDeclaration(i, /*privateDeclaration*/ true);
                 lateStatementReplacementMap.set("" + ts.getOriginalNodeId(i), result);
             }
+            // And lastly, we need to get the final form of all those indetermine import declarations from before and add them to the output list
+            // (and remove them from the set to examine for outter declarations)
             return ts.visitNodes(statements, visitLateVisibilityMarkedStatements);
             function visitLateVisibilityMarkedStatements(statement) {
                 if (ts.isLateVisibilityPaintedStatement(statement)) {
@@ -58392,6 +75267,7 @@ var ts;
                         lateStatementReplacementMap.delete(key);
                         if (result && ts.isSourceFile(statement.parent)) {
                             if (ts.isArray(result) ? ts.some(result, needsScopeMarker) : needsScopeMarker(result)) {
+                                // Top-level declarations in .d.ts files are always considered exported even without a modifier unless there's an export assignment or specifier
                                 needsScopeFixMarker = true;
                             }
                             if (ts.isArray(result) ? ts.some(result, isExternalModuleIndicator) : isExternalModuleIndicator(result)) {
@@ -58405,10 +75281,11 @@ var ts;
             }
         }
         function isExternalModuleIndicator(result) {
-            return ts.isAnyImportOrReExport(result) || ts.isExportAssignment(result) || ts.hasModifier(result, 1);
+            // Exported top-level member indicates moduleness
+            return ts.isAnyImportOrReExport(result) || ts.isExportAssignment(result) || ts.hasModifier(result, 1 /* Export */);
         }
         function needsScopeMarker(result) {
-            return !ts.isAnyImportOrReExport(result) && !ts.isExportAssignment(result) && !ts.hasModifier(result, 1) && !ts.isAmbientModule(result);
+            return !ts.isAnyImportOrReExport(result) && !ts.isExportAssignment(result) && !ts.hasModifier(result, 1 /* Export */) && !ts.isAmbientModule(result);
         }
         function visitDeclarationSubtree(input) {
             if (shouldStripInternal(input))
@@ -58420,8 +75297,10 @@ var ts;
                     return;
                 }
             }
+            // Elide implementation signatures from overload sets
             if (ts.isFunctionLike(input) && resolver.isImplementationOfOverload(input))
                 return;
+            // Elide semicolon class statements
             if (ts.isSemicolonClassElement(input))
                 return;
             var previousEnclosingDeclaration;
@@ -58430,11 +75309,12 @@ var ts;
                 enclosingDeclaration = input;
             }
             var oldDiag = getSymbolAccessibilityDiagnostic;
+            // Emit methods which are private as properties with no type information
             if (ts.isMethodDeclaration(input) || ts.isMethodSignature(input)) {
-                if (ts.hasModifier(input, 8)) {
+                if (ts.hasModifier(input, 8 /* Private */)) {
                     if (input.symbol && input.symbol.declarations && input.symbol.declarations[0] !== input)
-                        return;
-                    return cleanup(ts.createProperty(undefined, ensureModifiers(input), input.name, undefined, undefined, undefined));
+                        return; // Elide all but the first overload
+                    return cleanup(ts.createProperty(/*decorators*/ undefined, ensureModifiers(input), input.name, /*questionToken*/ undefined, /*type*/ undefined, /*initializer*/ undefined));
                 }
             }
             var canProdiceDiagnostic = ts.canProduceDiagnostics(input);
@@ -58445,75 +75325,84 @@ var ts;
                 checkEntityNameVisibility(input.exprName, enclosingDeclaration);
             }
             var oldWithinObjectLiteralType = suppressNewDiagnosticContexts;
-            var shouldEnterSuppressNewDiagnosticsContextContext = ((input.kind === 166 || input.kind === 177) && input.parent.kind !== 237);
+            var shouldEnterSuppressNewDiagnosticsContextContext = ((input.kind === 166 /* TypeLiteral */ || input.kind === 177 /* MappedType */) && input.parent.kind !== 237 /* TypeAliasDeclaration */);
             if (shouldEnterSuppressNewDiagnosticsContextContext) {
+                // We stop making new diagnostic contexts within object literal types. Unless it's an object type on the RHS of a type alias declaration. Then we do.
                 suppressNewDiagnosticContexts = true;
             }
             if (isProcessedComponent(input)) {
                 switch (input.kind) {
-                    case 207: {
+                    case 207 /* ExpressionWithTypeArguments */: {
                         if ((ts.isEntityName(input.expression) || ts.isEntityNameExpression(input.expression))) {
                             checkEntityNameVisibility(input.expression, enclosingDeclaration);
                         }
                         var node = ts.visitEachChild(input, visitDeclarationSubtree, context);
                         return cleanup(ts.updateExpressionWithTypeArguments(node, ts.parenthesizeTypeParameters(node.typeArguments), node.expression));
                     }
-                    case 162: {
+                    case 162 /* TypeReference */: {
                         checkEntityNameVisibility(input.typeName, enclosingDeclaration);
                         var node = ts.visitEachChild(input, visitDeclarationSubtree, context);
                         return cleanup(ts.updateTypeReferenceNode(node, node.typeName, ts.parenthesizeTypeParameters(node.typeArguments)));
                     }
-                    case 159:
+                    case 159 /* ConstructSignature */:
                         return cleanup(ts.updateConstructSignature(input, ensureTypeParams(input, input.typeParameters), updateParamsList(input, input.parameters), ensureType(input, input.type)));
-                    case 155: {
-                        var isPrivate = ts.hasModifier(input, 8);
-                        var ctor = ts.createSignatureDeclaration(155, isPrivate ? undefined : ensureTypeParams(input, input.typeParameters), isPrivate ? undefined : updateParamsList(input, input.parameters, 0), undefined);
+                    case 155 /* Constructor */: {
+                        var isPrivate = ts.hasModifier(input, 8 /* Private */);
+                        // A constructor declaration may not have a type annotation
+                        var ctor = ts.createSignatureDeclaration(155 /* Constructor */, isPrivate ? undefined : ensureTypeParams(input, input.typeParameters), 
+                        // TODO: GH#18217
+                        isPrivate ? undefined : updateParamsList(input, input.parameters, 0 /* None */), 
+                        /*type*/ undefined);
                         ctor.modifiers = ts.createNodeArray(ensureModifiers(input));
                         return cleanup(ctor);
                     }
-                    case 154: {
-                        var sig = ts.createSignatureDeclaration(153, ensureTypeParams(input, input.typeParameters), updateParamsList(input, input.parameters), ensureType(input, input.type));
+                    case 154 /* MethodDeclaration */: {
+                        var sig = ts.createSignatureDeclaration(153 /* MethodSignature */, ensureTypeParams(input, input.typeParameters), updateParamsList(input, input.parameters), ensureType(input, input.type));
                         sig.name = input.name;
                         sig.modifiers = ts.createNodeArray(ensureModifiers(input));
                         sig.questionToken = input.questionToken;
                         return cleanup(sig);
                     }
-                    case 156: {
+                    case 156 /* GetAccessor */: {
                         var newNode = ensureAccessor(input);
                         return cleanup(newNode);
                     }
-                    case 157: {
+                    case 157 /* SetAccessor */: {
                         var newNode = ensureAccessor(input);
                         return cleanup(newNode);
                     }
-                    case 152:
-                        return cleanup(ts.updateProperty(input, undefined, ensureModifiers(input), input.name, input.questionToken, !ts.hasModifier(input, 8) ? ensureType(input, input.type) : undefined, ensureNoInitializer(input)));
-                    case 151:
-                        return cleanup(ts.updatePropertySignature(input, ensureModifiers(input), input.name, input.questionToken, !ts.hasModifier(input, 8) ? ensureType(input, input.type) : undefined, ensureNoInitializer(input)));
-                    case 153: {
+                    case 152 /* PropertyDeclaration */:
+                        return cleanup(ts.updateProperty(input, 
+                        /*decorators*/ undefined, ensureModifiers(input), input.name, input.questionToken, !ts.hasModifier(input, 8 /* Private */) ? ensureType(input, input.type) : undefined, ensureNoInitializer(input)));
+                    case 151 /* PropertySignature */:
+                        return cleanup(ts.updatePropertySignature(input, ensureModifiers(input), input.name, input.questionToken, !ts.hasModifier(input, 8 /* Private */) ? ensureType(input, input.type) : undefined, ensureNoInitializer(input)));
+                    case 153 /* MethodSignature */: {
                         return cleanup(ts.updateMethodSignature(input, ensureTypeParams(input, input.typeParameters), updateParamsList(input, input.parameters), ensureType(input, input.type), input.name, input.questionToken));
                     }
-                    case 158: {
+                    case 158 /* CallSignature */: {
                         return cleanup(ts.updateCallSignature(input, ensureTypeParams(input, input.typeParameters), updateParamsList(input, input.parameters), ensureType(input, input.type)));
                     }
-                    case 160: {
-                        return cleanup(ts.updateIndexSignature(input, undefined, ensureModifiers(input), updateParamsList(input, input.parameters), ts.visitNode(input.type, visitDeclarationSubtree) || ts.createKeywordTypeNode(119)));
+                    case 160 /* IndexSignature */: {
+                        return cleanup(ts.updateIndexSignature(input, 
+                        /*decorators*/ undefined, ensureModifiers(input), updateParamsList(input, input.parameters), ts.visitNode(input.type, visitDeclarationSubtree) || ts.createKeywordTypeNode(119 /* AnyKeyword */)));
                     }
-                    case 232: {
+                    case 232 /* VariableDeclaration */: {
                         if (ts.isBindingPattern(input.name)) {
                             return recreateBindingPattern(input.name);
                         }
                         shouldEnterSuppressNewDiagnosticsContextContext = true;
-                        suppressNewDiagnosticContexts = true;
+                        suppressNewDiagnosticContexts = true; // Variable declaration types also suppress new diagnostic contexts, provided the contexts wouldn't be made for binding pattern types
                         return cleanup(ts.updateVariableDeclaration(input, input.name, ensureType(input, input.type), ensureNoInitializer(input)));
                     }
-                    case 148: {
+                    case 148 /* TypeParameter */: {
                         if (isPrivateMethodTypeParameter(input) && (input.default || input.constraint)) {
-                            return cleanup(ts.updateTypeParameterDeclaration(input, input.name, undefined, undefined));
+                            return cleanup(ts.updateTypeParameterDeclaration(input, input.name, /*constraint*/ undefined, /*defaultType*/ undefined));
                         }
                         return cleanup(ts.visitEachChild(input, visitDeclarationSubtree, context));
                     }
-                    case 171: {
+                    case 171 /* ConditionalType */: {
+                        // We have to process conditional types in a special way because for visibility purposes we need to push a new enclosingDeclaration
+                        // just for the `infer` types in the true branch. It's an implicit declaration scope that only applies to _part_ of the type.
                         var checkType = ts.visitNode(input.checkType, visitDeclarationSubtree);
                         var extendsType = ts.visitNode(input.extendsType, visitDeclarationSubtree);
                         var oldEnclosingDecl = enclosingDeclaration;
@@ -58523,13 +75412,13 @@ var ts;
                         var falseType = ts.visitNode(input.falseType, visitDeclarationSubtree);
                         return cleanup(ts.updateConditionalTypeNode(input, checkType, extendsType, trueType, falseType));
                     }
-                    case 163: {
+                    case 163 /* FunctionType */: {
                         return cleanup(ts.updateFunctionTypeNode(input, ts.visitNodes(input.typeParameters, visitDeclarationSubtree), updateParamsList(input, input.parameters), ts.visitNode(input.type, visitDeclarationSubtree)));
                     }
-                    case 164: {
+                    case 164 /* ConstructorType */: {
                         return cleanup(ts.updateConstructorTypeNode(input, ts.visitNodes(input.typeParameters, visitDeclarationSubtree), updateParamsList(input, input.parameters), ts.visitNode(input.type, visitDeclarationSubtree)));
                     }
-                    case 179: {
+                    case 179 /* ImportType */: {
                         if (!ts.isLiteralImportTypeNode(input))
                             return cleanup(input);
                         return cleanup(ts.updateImportTypeNode(input, ts.updateLiteralTypeNode(input.argument, rewriteModuleSpecifier(input, input.argument.literal)), input.qualifier, ts.visitNodes(input.typeArguments, visitDeclarationSubtree, ts.isTypeNode), input.isTypeOf));
@@ -58558,28 +75447,32 @@ var ts;
             }
         }
         function isPrivateMethodTypeParameter(node) {
-            return node.parent.kind === 154 && ts.hasModifier(node.parent, 8);
+            return node.parent.kind === 154 /* MethodDeclaration */ && ts.hasModifier(node.parent, 8 /* Private */);
         }
         function visitDeclarationStatements(input) {
             if (!isPreservedDeclarationStatement(input)) {
+                // return undefined for unmatched kinds to omit them from the tree
                 return;
             }
             if (shouldStripInternal(input))
                 return;
             switch (input.kind) {
-                case 250: {
+                case 250 /* ExportDeclaration */: {
                     if (ts.isSourceFile(input.parent)) {
                         resultHasExternalModuleIndicator = true;
                         resultHasScopeMarker = true;
                     }
-                    return ts.updateExportDeclaration(input, undefined, input.modifiers, input.exportClause, rewriteModuleSpecifier(input, input.moduleSpecifier));
+                    // Always visible if the parent node isn't dropped for being not visible
+                    // Rewrite external module names if necessary
+                    return ts.updateExportDeclaration(input, /*decorators*/ undefined, input.modifiers, input.exportClause, rewriteModuleSpecifier(input, input.moduleSpecifier));
                 }
-                case 249: {
+                case 249 /* ExportAssignment */: {
+                    // Always visible if the parent node isn't dropped for being not visible
                     if (ts.isSourceFile(input.parent)) {
                         resultHasExternalModuleIndicator = true;
                         resultHasScopeMarker = true;
                     }
-                    if (input.expression.kind === 71) {
+                    if (input.expression.kind === 71 /* Identifier */) {
                         return input;
                     }
                     else {
@@ -58588,13 +75481,14 @@ var ts;
                             diagnosticMessage: ts.Diagnostics.Default_export_of_the_module_has_or_is_using_private_name_0,
                             errorNode: input
                         }); };
-                        var varDecl = ts.createVariableDeclaration(newId, resolver.createTypeOfExpression(input.expression, input, declarationEmitNodeBuilderFlags, symbolTracker), undefined);
-                        var statement = ts.createVariableStatement(needsDeclare ? [ts.createModifier(124)] : [], ts.createVariableDeclarationList([varDecl], 2));
+                        var varDecl = ts.createVariableDeclaration(newId, resolver.createTypeOfExpression(input.expression, input, declarationEmitNodeBuilderFlags, symbolTracker), /*initializer*/ undefined);
+                        var statement = ts.createVariableStatement(needsDeclare ? [ts.createModifier(124 /* DeclareKeyword */)] : [], ts.createVariableDeclarationList([varDecl], 2 /* Const */));
                         return [statement, ts.updateExportAssignment(input, input.decorators, input.modifiers, newId)];
                     }
                 }
             }
             var result = transformTopLevelDeclaration(input);
+            // Don't actually transform yet; just leave as original node - will be elided/swapped by late pass
             lateStatementReplacementMap.set("" + ts.getOriginalNodeId(input), result);
             return input;
         }
@@ -58602,15 +75496,16 @@ var ts;
             if (shouldStripInternal(input))
                 return;
             switch (input.kind) {
-                case 243: {
+                case 243 /* ImportEqualsDeclaration */: {
                     return transformImportEqualsDeclaration(input);
                 }
-                case 244: {
+                case 244 /* ImportDeclaration */: {
                     return transformImportDeclaration(input);
                 }
             }
             if (ts.isDeclaration(input) && isDeclarationAndNotVisible(input))
                 return;
+            // Elide implementation signatures from overload sets
             if (ts.isFunctionLike(input) && resolver.isImplementationOfOverload(input))
                 return;
             var previousEnclosingDeclaration;
@@ -58625,36 +75520,45 @@ var ts;
             }
             var previousNeedsDeclare = needsDeclare;
             switch (input.kind) {
-                case 237:
-                    return cleanup(ts.updateTypeAliasDeclaration(input, undefined, ensureModifiers(input, isPrivate), input.name, ts.visitNodes(input.typeParameters, visitDeclarationSubtree, ts.isTypeParameterDeclaration), ts.visitNode(input.type, visitDeclarationSubtree, ts.isTypeNode)));
-                case 236: {
-                    return cleanup(ts.updateInterfaceDeclaration(input, undefined, ensureModifiers(input, isPrivate), input.name, ensureTypeParams(input, input.typeParameters), transformHeritageClauses(input.heritageClauses), ts.visitNodes(input.members, visitDeclarationSubtree)));
+                case 237 /* TypeAliasDeclaration */: // Type aliases get `declare`d if need be (for legacy support), but that's all
+                    return cleanup(ts.updateTypeAliasDeclaration(input, 
+                    /*decorators*/ undefined, ensureModifiers(input, isPrivate), input.name, ts.visitNodes(input.typeParameters, visitDeclarationSubtree, ts.isTypeParameterDeclaration), ts.visitNode(input.type, visitDeclarationSubtree, ts.isTypeNode)));
+                case 236 /* InterfaceDeclaration */: {
+                    return cleanup(ts.updateInterfaceDeclaration(input, 
+                    /*decorators*/ undefined, ensureModifiers(input, isPrivate), input.name, ensureTypeParams(input, input.typeParameters), transformHeritageClauses(input.heritageClauses), ts.visitNodes(input.members, visitDeclarationSubtree)));
                 }
-                case 234: {
-                    return cleanup(ts.updateFunctionDeclaration(input, undefined, ensureModifiers(input, isPrivate), undefined, input.name, ensureTypeParams(input, input.typeParameters), updateParamsList(input, input.parameters), ensureType(input, input.type), undefined));
+                case 234 /* FunctionDeclaration */: {
+                    // Generators lose their generator-ness, excepting their return type
+                    return cleanup(ts.updateFunctionDeclaration(input, 
+                    /*decorators*/ undefined, ensureModifiers(input, isPrivate), 
+                    /*asteriskToken*/ undefined, input.name, ensureTypeParams(input, input.typeParameters), updateParamsList(input, input.parameters), ensureType(input, input.type), 
+                    /*body*/ undefined));
                 }
-                case 239: {
+                case 239 /* ModuleDeclaration */: {
                     needsDeclare = false;
                     var inner = input.body;
-                    if (inner && inner.kind === 240) {
+                    if (inner && inner.kind === 240 /* ModuleBlock */) {
                         var statements = ts.visitNodes(inner.statements, visitDeclarationStatements);
                         var body = ts.updateModuleBlock(inner, transformAndReplaceLatePaintedStatements(statements));
                         needsDeclare = previousNeedsDeclare;
                         var mods = ensureModifiers(input, isPrivate);
-                        return cleanup(ts.updateModuleDeclaration(input, undefined, mods, ts.isExternalModuleAugmentation(input) ? rewriteModuleSpecifier(input, input.name) : input.name, body));
+                        return cleanup(ts.updateModuleDeclaration(input, 
+                        /*decorators*/ undefined, mods, ts.isExternalModuleAugmentation(input) ? rewriteModuleSpecifier(input, input.name) : input.name, body));
                     }
                     else {
                         needsDeclare = previousNeedsDeclare;
                         var mods = ensureModifiers(input, isPrivate);
                         needsDeclare = false;
                         ts.visitNode(inner, visitDeclarationStatements);
-                        var id = "" + ts.getOriginalNodeId(inner);
+                        // eagerly transform nested namespaces (the nesting doesn't need any elision or painting done)
+                        var id = "" + ts.getOriginalNodeId(inner); // TODO: GH#18217
                         var body = lateStatementReplacementMap.get(id);
                         lateStatementReplacementMap.delete(id);
-                        return cleanup(ts.updateModuleDeclaration(input, undefined, mods, input.name, body));
+                        return cleanup(ts.updateModuleDeclaration(input, 
+                        /*decorators*/ undefined, mods, input.name, body));
                     }
                 }
-                case 235: {
+                case 235 /* ClassDeclaration */: {
                     var modifiers = ts.createNodeArray(ensureModifiers(input, isPrivate));
                     var typeParameters = ensureTypeParams(input, input.typeParameters);
                     var ctor = ts.getFirstConstructorWithBody(input);
@@ -58662,13 +75566,15 @@ var ts;
                     if (ctor) {
                         var oldDiag_1 = getSymbolAccessibilityDiagnostic;
                         parameterProperties = ts.compact(ts.flatMap(ctor.parameters, function (param) {
-                            if (!ts.hasModifier(param, 92))
+                            if (!ts.hasModifier(param, 92 /* ParameterPropertyModifier */))
                                 return;
                             getSymbolAccessibilityDiagnostic = ts.createGetSymbolAccessibilityDiagnosticForNode(param);
-                            if (param.name.kind === 71) {
-                                return preserveJsDoc(ts.createProperty(undefined, ensureModifiers(param), param.name, param.questionToken, ensureType(param, param.type), ensureNoInitializer(param)), param);
+                            if (param.name.kind === 71 /* Identifier */) {
+                                return preserveJsDoc(ts.createProperty(
+                                /*decorators*/ undefined, ensureModifiers(param), param.name, param.questionToken, ensureType(param, param.type), ensureNoInitializer(param)), param);
                             }
                             else {
+                                // Pattern - this is currently an error, but we emit declarations for it somewhat correctly
                                 return walkBindingPattern(param.name);
                             }
                             function walkBindingPattern(pattern) {
@@ -58681,7 +75587,10 @@ var ts;
                                         elems = ts.concatenate(elems, walkBindingPattern(elem.name));
                                     }
                                     elems = elems || [];
-                                    elems.push(ts.createProperty(undefined, ensureModifiers(param), elem.name, undefined, ensureType(elem, undefined), undefined));
+                                    elems.push(ts.createProperty(
+                                    /*decorators*/ undefined, ensureModifiers(param), elem.name, 
+                                    /*questionToken*/ undefined, ensureType(elem, /*type*/ undefined), 
+                                    /*initializer*/ undefined));
                                 }
                                 return elems;
                             }
@@ -58690,44 +75599,49 @@ var ts;
                     }
                     var members = ts.createNodeArray(ts.concatenate(parameterProperties, ts.visitNodes(input.members, visitDeclarationSubtree)));
                     var extendsClause_1 = ts.getClassExtendsHeritageClauseElement(input);
-                    if (extendsClause_1 && !ts.isEntityNameExpression(extendsClause_1.expression) && extendsClause_1.expression.kind !== 95) {
-                        var newId_1 = ts.createOptimisticUniqueName(ts.unescapeLeadingUnderscores(input.name.escapedText) + "_base");
+                    if (extendsClause_1 && !ts.isEntityNameExpression(extendsClause_1.expression) && extendsClause_1.expression.kind !== 95 /* NullKeyword */) {
+                        // We must add a temporary declaration for the extends clause expression
+                        var newId_1 = ts.createOptimisticUniqueName(ts.unescapeLeadingUnderscores(input.name.escapedText) + "_base"); // TODO: GH#18217
                         getSymbolAccessibilityDiagnostic = function () { return ({
                             diagnosticMessage: ts.Diagnostics.extends_clause_of_exported_class_0_has_or_is_using_private_name_1,
                             errorNode: extendsClause_1,
                             typeName: input.name
                         }); };
-                        var varDecl = ts.createVariableDeclaration(newId_1, resolver.createTypeOfExpression(extendsClause_1.expression, input, declarationEmitNodeBuilderFlags, symbolTracker), undefined);
-                        var statement = ts.createVariableStatement(needsDeclare ? [ts.createModifier(124)] : [], ts.createVariableDeclarationList([varDecl], 2));
+                        var varDecl = ts.createVariableDeclaration(newId_1, resolver.createTypeOfExpression(extendsClause_1.expression, input, declarationEmitNodeBuilderFlags, symbolTracker), /*initializer*/ undefined);
+                        var statement = ts.createVariableStatement(needsDeclare ? [ts.createModifier(124 /* DeclareKeyword */)] : [], ts.createVariableDeclarationList([varDecl], 2 /* Const */));
                         var heritageClauses = ts.createNodeArray(ts.map(input.heritageClauses, function (clause) {
-                            if (clause.token === 85) {
+                            if (clause.token === 85 /* ExtendsKeyword */) {
                                 var oldDiag_2 = getSymbolAccessibilityDiagnostic;
                                 getSymbolAccessibilityDiagnostic = ts.createGetSymbolAccessibilityDiagnosticForNode(clause.types[0]);
                                 var newClause = ts.updateHeritageClause(clause, ts.map(clause.types, function (t) { return ts.updateExpressionWithTypeArguments(t, ts.visitNodes(t.typeArguments, visitDeclarationSubtree), newId_1); }));
                                 getSymbolAccessibilityDiagnostic = oldDiag_2;
                                 return newClause;
                             }
-                            return ts.updateHeritageClause(clause, ts.visitNodes(ts.createNodeArray(ts.filter(clause.types, function (t) { return ts.isEntityNameExpression(t.expression) || t.expression.kind === 95; })), visitDeclarationSubtree));
+                            return ts.updateHeritageClause(clause, ts.visitNodes(ts.createNodeArray(ts.filter(clause.types, function (t) { return ts.isEntityNameExpression(t.expression) || t.expression.kind === 95 /* NullKeyword */; })), visitDeclarationSubtree));
                         }));
-                        return [statement, cleanup(ts.updateClassDeclaration(input, undefined, modifiers, input.name, typeParameters, heritageClauses, members))];
+                        return [statement, cleanup(ts.updateClassDeclaration(input, 
+                            /*decorators*/ undefined, modifiers, input.name, typeParameters, heritageClauses, members))]; // TODO: GH#18217
                     }
                     else {
                         var heritageClauses = transformHeritageClauses(input.heritageClauses);
-                        return cleanup(ts.updateClassDeclaration(input, undefined, modifiers, input.name, typeParameters, heritageClauses, members));
+                        return cleanup(ts.updateClassDeclaration(input, 
+                        /*decorators*/ undefined, modifiers, input.name, typeParameters, heritageClauses, members));
                     }
                 }
-                case 214: {
+                case 214 /* VariableStatement */: {
                     return cleanup(transformVariableStatement(input, isPrivate));
                 }
-                case 238: {
-                    return cleanup(ts.updateEnumDeclaration(input, undefined, ts.createNodeArray(ensureModifiers(input, isPrivate)), input.name, ts.createNodeArray(ts.mapDefined(input.members, function (m) {
+                case 238 /* EnumDeclaration */: {
+                    return cleanup(ts.updateEnumDeclaration(input, /*decorators*/ undefined, ts.createNodeArray(ensureModifiers(input, isPrivate)), input.name, ts.createNodeArray(ts.mapDefined(input.members, function (m) {
                         if (shouldStripInternal(m))
                             return;
+                        // Rewrite enum values to their constants, if available
                         var constValue = resolver.getConstantValue(m);
                         return preserveJsDoc(ts.updateEnumMember(m, m.name, constValue !== undefined ? ts.createLiteral(constValue) : undefined), m);
                     }))));
                 }
             }
+            // Anything left unhandled is an error, so this should be unreachable
             return ts.Debug.assertNever(input, "Unhandled top-level node in declaration emit: " + ts.SyntaxKind[input.kind]);
             function cleanup(node) {
                 if (isEnclosingDeclaration(input)) {
@@ -58736,7 +75650,7 @@ var ts;
                 if (canProdiceDiagnostic) {
                     getSymbolAccessibilityDiagnostic = oldDiag;
                 }
-                if (input.kind === 239) {
+                if (input.kind === 239 /* ModuleDeclaration */) {
                     needsDeclare = previousNeedsDeclare;
                 }
                 if (node === input) {
@@ -58757,7 +75671,7 @@ var ts;
             return ts.flatten(ts.mapDefined(d.elements, function (e) { return recreateBindingElement(e); }));
         }
         function recreateBindingElement(e) {
-            if (e.kind === 206) {
+            if (e.kind === 206 /* OmittedExpression */) {
                 return;
             }
             if (e.name) {
@@ -58767,7 +75681,7 @@ var ts;
                     return recreateBindingPattern(e.name);
                 }
                 else {
-                    return ts.createVariableDeclaration(e.name, ensureType(e, undefined), undefined);
+                    return ts.createVariableDeclaration(e.name, ensureType(e, /*type*/ undefined), /*initializer*/ undefined);
                 }
             }
         }
@@ -58778,7 +75692,7 @@ var ts;
                 getSymbolAccessibilityDiagnostic = ts.createGetSymbolAccessibilityDiagnosticForNodeName(node);
             }
             errorNameNode = node.name;
-            ts.Debug.assert(resolver.isLateBound(ts.getParseTreeNode(node)));
+            ts.Debug.assert(resolver.isLateBound(ts.getParseTreeNode(node))); // Should only be called with dynamic names
             var decl = node;
             var entityName = decl.name.expression;
             checkEntityNameVisibility(entityName, enclosingDeclaration);
@@ -58809,12 +75723,12 @@ var ts;
             return ts.createModifiersFromModifierFlags(newFlags);
         }
         function ensureModifierFlags(node, privateDeclaration) {
-            var mask = 3071 ^ (4 | 256);
-            var additions = (needsDeclare && !isAlwaysType(node)) ? 2 : 0;
-            var parentIsFile = node.parent.kind === 274;
+            var mask = 3071 /* All */ ^ (4 /* Public */ | 256 /* Async */); // No async modifiers in declaration files
+            var additions = (needsDeclare && !isAlwaysType(node)) ? 2 /* Ambient */ : 0 /* None */;
+            var parentIsFile = node.parent.kind === 274 /* SourceFile */;
             if (!parentIsFile || (isBundledEmit && parentIsFile && ts.isExternalModule(node.parent))) {
-                mask ^= ((privateDeclaration || (isBundledEmit && parentIsFile) ? 0 : 1) | 512 | 2);
-                additions = 0;
+                mask ^= ((privateDeclaration || (isBundledEmit && parentIsFile) ? 0 : 1 /* Export */) | 512 /* Default */ | 2 /* Ambient */);
+                additions = 0 /* None */;
             }
             return maskModifierFlags(node, mask, additions);
         }
@@ -58826,13 +75740,14 @@ var ts;
             var accessorType = getTypeAnnotationFromAccessor(node);
             if (!accessorType && accessors.secondAccessor) {
                 accessorType = getTypeAnnotationFromAccessor(accessors.secondAccessor);
+                // If we end up pulling the type from the second accessor, we also need to change the diagnostic context to get the expected error message
                 getSymbolAccessibilityDiagnostic = ts.createGetSymbolAccessibilityDiagnosticForNode(accessors.secondAccessor);
             }
-            var prop = ts.createProperty(undefined, maskModifiers(node, undefined, (!accessors.setAccessor) ? 64 : 0), node.name, node.questionToken, ensureType(node, accessorType), undefined);
+            var prop = ts.createProperty(/*decorators*/ undefined, maskModifiers(node, /*mask*/ undefined, (!accessors.setAccessor) ? 64 /* Readonly */ : 0 /* None */), node.name, node.questionToken, ensureType(node, accessorType), /*initializer*/ undefined);
             var leadingsSyntheticCommentRanges = accessors.secondAccessor && ts.getLeadingCommentRangesOfNode(accessors.secondAccessor, currentSourceFile);
             if (leadingsSyntheticCommentRanges) {
-                var _loop_9 = function (range) {
-                    if (range.kind === 3) {
+                var _loop_7 = function (range) {
+                    if (range.kind === 3 /* MultiLineCommentTrivia */) {
                         var text = currentSourceFile.text.slice(range.pos + 2, range.end - 2);
                         var lines = text.split(/\r\n?|\n/g);
                         if (lines.length > 1) {
@@ -58845,97 +75760,99 @@ var ts;
                 };
                 for (var _i = 0, leadingsSyntheticCommentRanges_1 = leadingsSyntheticCommentRanges; _i < leadingsSyntheticCommentRanges_1.length; _i++) {
                     var range = leadingsSyntheticCommentRanges_1[_i];
-                    _loop_9(range);
+                    _loop_7(range);
                 }
             }
             return prop;
         }
         function transformHeritageClauses(nodes) {
             return ts.createNodeArray(ts.filter(ts.map(nodes, function (clause) { return ts.updateHeritageClause(clause, ts.visitNodes(ts.createNodeArray(ts.filter(clause.types, function (t) {
-                return ts.isEntityNameExpression(t.expression) || (clause.token === 85 && t.expression.kind === 95);
+                return ts.isEntityNameExpression(t.expression) || (clause.token === 85 /* ExtendsKeyword */ && t.expression.kind === 95 /* NullKeyword */);
             })), visitDeclarationSubtree)); }), function (clause) { return clause.types && !!clause.types.length; }));
         }
     }
     ts.transformDeclarations = transformDeclarations;
     function isAlwaysType(node) {
-        if (node.kind === 236) {
+        if (node.kind === 236 /* InterfaceDeclaration */) {
             return true;
         }
         return false;
     }
+    // Elide "public" modifier, as it is the default
     function maskModifiers(node, modifierMask, modifierAdditions) {
         return ts.createModifiersFromModifierFlags(maskModifierFlags(node, modifierMask, modifierAdditions));
     }
     function maskModifierFlags(node, modifierMask, modifierAdditions) {
-        if (modifierMask === void 0) { modifierMask = 3071 ^ 4; }
-        if (modifierAdditions === void 0) { modifierAdditions = 0; }
+        if (modifierMask === void 0) { modifierMask = 3071 /* All */ ^ 4 /* Public */; }
+        if (modifierAdditions === void 0) { modifierAdditions = 0 /* None */; }
         var flags = (ts.getModifierFlags(node) & modifierMask) | modifierAdditions;
-        if (flags & 512 && flags & 2) {
-            flags ^= 2;
+        if (flags & 512 /* Default */ && flags & 2 /* Ambient */) {
+            flags ^= 2 /* Ambient */; // `declare` is never required alongside `default` (and would be an error if printed)
         }
         return flags;
     }
     function getTypeAnnotationFromAccessor(accessor) {
         if (accessor) {
-            return accessor.kind === 156
-                ? accessor.type
+            return accessor.kind === 156 /* GetAccessor */
+                ? accessor.type // Getter - return type
                 : accessor.parameters.length > 0
-                    ? accessor.parameters[0].type
+                    ? accessor.parameters[0].type // Setter parameter type
                     : undefined;
         }
     }
     function canHaveLiteralInitializer(node) {
         switch (node.kind) {
-            case 232:
-            case 152:
-            case 151:
-            case 149:
+            case 232 /* VariableDeclaration */:
+            case 152 /* PropertyDeclaration */:
+            case 151 /* PropertySignature */:
+            case 149 /* Parameter */:
                 return true;
         }
         return false;
     }
     function isPreservedDeclarationStatement(node) {
         switch (node.kind) {
-            case 234:
-            case 239:
-            case 243:
-            case 236:
-            case 235:
-            case 237:
-            case 238:
-            case 214:
-            case 244:
-            case 250:
-            case 249:
+            case 234 /* FunctionDeclaration */:
+            case 239 /* ModuleDeclaration */:
+            case 243 /* ImportEqualsDeclaration */:
+            case 236 /* InterfaceDeclaration */:
+            case 235 /* ClassDeclaration */:
+            case 237 /* TypeAliasDeclaration */:
+            case 238 /* EnumDeclaration */:
+            case 214 /* VariableStatement */:
+            case 244 /* ImportDeclaration */:
+            case 250 /* ExportDeclaration */:
+            case 249 /* ExportAssignment */:
                 return true;
         }
         return false;
     }
     function isProcessedComponent(node) {
         switch (node.kind) {
-            case 159:
-            case 155:
-            case 154:
-            case 156:
-            case 157:
-            case 152:
-            case 151:
-            case 153:
-            case 158:
-            case 160:
-            case 232:
-            case 148:
-            case 207:
-            case 162:
-            case 171:
-            case 163:
-            case 164:
-            case 179:
+            case 159 /* ConstructSignature */:
+            case 155 /* Constructor */:
+            case 154 /* MethodDeclaration */:
+            case 156 /* GetAccessor */:
+            case 157 /* SetAccessor */:
+            case 152 /* PropertyDeclaration */:
+            case 151 /* PropertySignature */:
+            case 153 /* MethodSignature */:
+            case 158 /* CallSignature */:
+            case 160 /* IndexSignature */:
+            case 232 /* VariableDeclaration */:
+            case 148 /* TypeParameter */:
+            case 207 /* ExpressionWithTypeArguments */:
+            case 162 /* TypeReference */:
+            case 171 /* ConditionalType */:
+            case 163 /* FunctionType */:
+            case 164 /* ConstructorType */:
+            case 179 /* ImportType */:
                 return true;
         }
         return false;
     }
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     function getModuleTransformer(moduleKind) {
@@ -58949,6 +75866,18 @@ var ts;
                 return ts.transformModule;
         }
     }
+    var TransformationState;
+    (function (TransformationState) {
+        TransformationState[TransformationState["Uninitialized"] = 0] = "Uninitialized";
+        TransformationState[TransformationState["Initialized"] = 1] = "Initialized";
+        TransformationState[TransformationState["Completed"] = 2] = "Completed";
+        TransformationState[TransformationState["Disposed"] = 3] = "Disposed";
+    })(TransformationState || (TransformationState = {}));
+    var SyntaxKindFeatureFlags;
+    (function (SyntaxKindFeatureFlags) {
+        SyntaxKindFeatureFlags[SyntaxKindFeatureFlags["Substitution"] = 1] = "Substitution";
+        SyntaxKindFeatureFlags[SyntaxKindFeatureFlags["EmitNotifications"] = 2] = "EmitNotifications";
+    })(SyntaxKindFeatureFlags || (SyntaxKindFeatureFlags = {}));
     function getTransformers(compilerOptions, customTransformers) {
         var jsx = compilerOptions.jsx;
         var languageVersion = ts.getEmitScriptTarget(compilerOptions);
@@ -58956,32 +75885,44 @@ var ts;
         var transformers = [];
         ts.addRange(transformers, customTransformers && customTransformers.before);
         transformers.push(ts.transformTypeScript);
-        if (jsx === 2) {
+        if (jsx === 2 /* React */) {
             transformers.push(ts.transformJsx);
         }
-        if (languageVersion < 6) {
+        if (languageVersion < 6 /* ESNext */) {
             transformers.push(ts.transformESNext);
         }
-        if (languageVersion < 4) {
+        if (languageVersion < 4 /* ES2017 */) {
             transformers.push(ts.transformES2017);
         }
-        if (languageVersion < 3) {
+        if (languageVersion < 3 /* ES2016 */) {
             transformers.push(ts.transformES2016);
         }
-        if (languageVersion < 2) {
+        if (languageVersion < 2 /* ES2015 */) {
             transformers.push(ts.transformES2015);
             transformers.push(ts.transformGenerators);
         }
         transformers.push(getModuleTransformer(moduleKind));
-        if (languageVersion < 1) {
+        // The ES5 transformer is last so that it can substitute expressions like `exports.default`
+        // for ES3.
+        if (languageVersion < 1 /* ES5 */) {
             transformers.push(ts.transformES5);
         }
         ts.addRange(transformers, customTransformers && customTransformers.after);
         return transformers;
     }
     ts.getTransformers = getTransformers;
+    /**
+     * Transforms an array of SourceFiles by passing them through each transformer.
+     *
+     * @param resolver The emit resolver provided by the checker.
+     * @param host The emit host object used to interact with the file system.
+     * @param options Compiler options to surface in the `TransformationContext`.
+     * @param nodes An array of nodes to transform.
+     * @param transforms An array of `TransformerFactory` callbacks.
+     * @param allowDtsFiles A value indicating whether to allow the transformation of .d.ts files.
+     */
     function transformNodes(resolver, host, options, nodes, transformers, allowDtsFiles) {
-        var enabledSyntaxKindFeatures = new Array(305);
+        var enabledSyntaxKindFeatures = new Array(305 /* Count */);
         var lexicalEnvironmentVariableDeclarations;
         var lexicalEnvironmentFunctionDeclarations;
         var lexicalEnvironmentVariableDeclarationsStack = [];
@@ -58991,8 +75932,10 @@ var ts;
         var emitHelpers;
         var onSubstituteNode = function (_, node) { return node; };
         var onEmitNode = function (hint, node, callback) { return callback(hint, node); };
-        var state = 0;
+        var state = 0 /* Uninitialized */;
         var diagnostics = [];
+        // The transformation context is provided to each transformer as part of transformer
+        // initialization.
         var context = {
             getCompilerOptions: function () { return options; },
             getEmitResolver: function () { return resolver; },
@@ -59011,13 +75954,13 @@ var ts;
             isEmitNotificationEnabled: isEmitNotificationEnabled,
             get onSubstituteNode() { return onSubstituteNode; },
             set onSubstituteNode(value) {
-                ts.Debug.assert(state < 1, "Cannot modify transformation hooks after initialization has completed.");
+                ts.Debug.assert(state < 1 /* Initialized */, "Cannot modify transformation hooks after initialization has completed.");
                 ts.Debug.assert(value !== undefined, "Value must not be 'undefined'");
                 onSubstituteNode = value;
             },
             get onEmitNode() { return onEmitNode; },
             set onEmitNode(value) {
-                ts.Debug.assert(state < 1, "Cannot modify transformation hooks after initialization has completed.");
+                ts.Debug.assert(state < 1 /* Initialized */, "Cannot modify transformation hooks after initialization has completed.");
                 ts.Debug.assert(value !== undefined, "Value must not be 'undefined'");
                 onEmitNode = value;
             },
@@ -59025,15 +75968,20 @@ var ts;
                 diagnostics.push(diag);
             }
         };
-        for (var _i = 0, nodes_4 = nodes; _i < nodes_4.length; _i++) {
-            var node = nodes_4[_i];
+        // Ensure the parse tree is clean before applying transformations
+        for (var _i = 0, nodes_3 = nodes; _i < nodes_3.length; _i++) {
+            var node = nodes_3[_i];
             ts.disposeEmitNodes(ts.getSourceFileOfNode(ts.getParseTreeNode(node)));
         }
         ts.performance.mark("beforeTransform");
+        // Chain together and initialize each transformer.
         var transformation = ts.chain.apply(void 0, transformers)(context);
-        state = 1;
+        // prevent modification of transformation hooks.
+        state = 1 /* Initialized */;
+        // Transform each node.
         var transformed = ts.map(nodes, allowDtsFiles ? transformation : transformRoot);
-        state = 2;
+        // prevent modification of the lexical environment.
+        state = 2 /* Completed */;
         ts.performance.mark("afterTransform");
         ts.performance.measure("transformTime", "beforeTransform", "afterTransform");
         return {
@@ -59046,28 +75994,55 @@ var ts;
         function transformRoot(node) {
             return node && (!ts.isSourceFile(node) || !node.isDeclarationFile) ? transformation(node) : node;
         }
+        /**
+         * Enables expression substitutions in the pretty printer for the provided SyntaxKind.
+         */
         function enableSubstitution(kind) {
-            ts.Debug.assert(state < 2, "Cannot modify the transformation context after transformation has completed.");
-            enabledSyntaxKindFeatures[kind] |= 1;
+            ts.Debug.assert(state < 2 /* Completed */, "Cannot modify the transformation context after transformation has completed.");
+            enabledSyntaxKindFeatures[kind] |= 1 /* Substitution */;
         }
+        /**
+         * Determines whether expression substitutions are enabled for the provided node.
+         */
         function isSubstitutionEnabled(node) {
-            return (enabledSyntaxKindFeatures[node.kind] & 1) !== 0
-                && (ts.getEmitFlags(node) & 4) === 0;
+            return (enabledSyntaxKindFeatures[node.kind] & 1 /* Substitution */) !== 0
+                && (ts.getEmitFlags(node) & 4 /* NoSubstitution */) === 0;
         }
+        /**
+         * Emits a node with possible substitution.
+         *
+         * @param hint A hint as to the intended usage of the node.
+         * @param node The node to emit.
+         * @param emitCallback The callback used to emit the node or its substitute.
+         */
         function substituteNode(hint, node) {
-            ts.Debug.assert(state < 3, "Cannot substitute a node after the result is disposed.");
+            ts.Debug.assert(state < 3 /* Disposed */, "Cannot substitute a node after the result is disposed.");
             return node && isSubstitutionEnabled(node) && onSubstituteNode(hint, node) || node;
         }
+        /**
+         * Enables before/after emit notifications in the pretty printer for the provided SyntaxKind.
+         */
         function enableEmitNotification(kind) {
-            ts.Debug.assert(state < 2, "Cannot modify the transformation context after transformation has completed.");
-            enabledSyntaxKindFeatures[kind] |= 2;
+            ts.Debug.assert(state < 2 /* Completed */, "Cannot modify the transformation context after transformation has completed.");
+            enabledSyntaxKindFeatures[kind] |= 2 /* EmitNotifications */;
         }
+        /**
+         * Determines whether before/after emit notifications should be raised in the pretty
+         * printer when it emits a node.
+         */
         function isEmitNotificationEnabled(node) {
-            return (enabledSyntaxKindFeatures[node.kind] & 2) !== 0
-                || (ts.getEmitFlags(node) & 2) !== 0;
+            return (enabledSyntaxKindFeatures[node.kind] & 2 /* EmitNotifications */) !== 0
+                || (ts.getEmitFlags(node) & 2 /* AdviseOnEmitNode */) !== 0;
         }
+        /**
+         * Emits a node with possible emit notification.
+         *
+         * @param hint A hint as to the intended usage of the node.
+         * @param node The node to emit.
+         * @param emitCallback The callback used to emit the node.
+         */
         function emitNodeWithNotification(hint, node, emitCallback) {
-            ts.Debug.assert(state < 3, "Cannot invoke TransformationResult callbacks after the result is disposed.");
+            ts.Debug.assert(state < 3 /* Disposed */, "Cannot invoke TransformationResult callbacks after the result is disposed.");
             if (node) {
                 if (isEmitNotificationEnabled(node)) {
                     onEmitNode(hint, node, emitCallback);
@@ -59077,10 +76052,13 @@ var ts;
                 }
             }
         }
+        /**
+         * Records a hoisted variable declaration for the provided name within a lexical environment.
+         */
         function hoistVariableDeclaration(name) {
-            ts.Debug.assert(state > 0, "Cannot modify the lexical environment during initialization.");
-            ts.Debug.assert(state < 2, "Cannot modify the lexical environment after transformation has completed.");
-            var decl = ts.setEmitFlags(ts.createVariableDeclaration(name), 64);
+            ts.Debug.assert(state > 0 /* Uninitialized */, "Cannot modify the lexical environment during initialization.");
+            ts.Debug.assert(state < 2 /* Completed */, "Cannot modify the lexical environment after transformation has completed.");
+            var decl = ts.setEmitFlags(ts.createVariableDeclaration(name), 64 /* NoNestedSourceMaps */);
             if (!lexicalEnvironmentVariableDeclarations) {
                 lexicalEnvironmentVariableDeclarations = [decl];
             }
@@ -59088,9 +76066,12 @@ var ts;
                 lexicalEnvironmentVariableDeclarations.push(decl);
             }
         }
+        /**
+         * Records a hoisted function declaration within a lexical environment.
+         */
         function hoistFunctionDeclaration(func) {
-            ts.Debug.assert(state > 0, "Cannot modify the lexical environment during initialization.");
-            ts.Debug.assert(state < 2, "Cannot modify the lexical environment after transformation has completed.");
+            ts.Debug.assert(state > 0 /* Uninitialized */, "Cannot modify the lexical environment during initialization.");
+            ts.Debug.assert(state < 2 /* Completed */, "Cannot modify the lexical environment after transformation has completed.");
             if (!lexicalEnvironmentFunctionDeclarations) {
                 lexicalEnvironmentFunctionDeclarations = [func];
             }
@@ -59098,31 +76079,45 @@ var ts;
                 lexicalEnvironmentFunctionDeclarations.push(func);
             }
         }
+        /**
+         * Starts a new lexical environment. Any existing hoisted variable or function declarations
+         * are pushed onto a stack, and the related storage variables are reset.
+         */
         function startLexicalEnvironment() {
-            ts.Debug.assert(state > 0, "Cannot modify the lexical environment during initialization.");
-            ts.Debug.assert(state < 2, "Cannot modify the lexical environment after transformation has completed.");
+            ts.Debug.assert(state > 0 /* Uninitialized */, "Cannot modify the lexical environment during initialization.");
+            ts.Debug.assert(state < 2 /* Completed */, "Cannot modify the lexical environment after transformation has completed.");
             ts.Debug.assert(!lexicalEnvironmentSuspended, "Lexical environment is suspended.");
+            // Save the current lexical environment. Rather than resizing the array we adjust the
+            // stack size variable. This allows us to reuse existing array slots we've
+            // already allocated between transformations to avoid allocation and GC overhead during
+            // transformation.
             lexicalEnvironmentVariableDeclarationsStack[lexicalEnvironmentStackOffset] = lexicalEnvironmentVariableDeclarations;
             lexicalEnvironmentFunctionDeclarationsStack[lexicalEnvironmentStackOffset] = lexicalEnvironmentFunctionDeclarations;
             lexicalEnvironmentStackOffset++;
             lexicalEnvironmentVariableDeclarations = undefined;
             lexicalEnvironmentFunctionDeclarations = undefined;
         }
+        /** Suspends the current lexical environment, usually after visiting a parameter list. */
         function suspendLexicalEnvironment() {
-            ts.Debug.assert(state > 0, "Cannot modify the lexical environment during initialization.");
-            ts.Debug.assert(state < 2, "Cannot modify the lexical environment after transformation has completed.");
+            ts.Debug.assert(state > 0 /* Uninitialized */, "Cannot modify the lexical environment during initialization.");
+            ts.Debug.assert(state < 2 /* Completed */, "Cannot modify the lexical environment after transformation has completed.");
             ts.Debug.assert(!lexicalEnvironmentSuspended, "Lexical environment is already suspended.");
             lexicalEnvironmentSuspended = true;
         }
+        /** Resumes a suspended lexical environment, usually before visiting a function body. */
         function resumeLexicalEnvironment() {
-            ts.Debug.assert(state > 0, "Cannot modify the lexical environment during initialization.");
-            ts.Debug.assert(state < 2, "Cannot modify the lexical environment after transformation has completed.");
+            ts.Debug.assert(state > 0 /* Uninitialized */, "Cannot modify the lexical environment during initialization.");
+            ts.Debug.assert(state < 2 /* Completed */, "Cannot modify the lexical environment after transformation has completed.");
             ts.Debug.assert(lexicalEnvironmentSuspended, "Lexical environment is not suspended.");
             lexicalEnvironmentSuspended = false;
         }
+        /**
+         * Ends a lexical environment. The previous set of hoisted declarations are restored and
+         * any hoisted declarations added in this environment are returned.
+         */
         function endLexicalEnvironment() {
-            ts.Debug.assert(state > 0, "Cannot modify the lexical environment during initialization.");
-            ts.Debug.assert(state < 2, "Cannot modify the lexical environment after transformation has completed.");
+            ts.Debug.assert(state > 0 /* Uninitialized */, "Cannot modify the lexical environment during initialization.");
+            ts.Debug.assert(state < 2 /* Completed */, "Cannot modify the lexical environment after transformation has completed.");
             ts.Debug.assert(!lexicalEnvironmentSuspended, "Lexical environment is suspended.");
             var statements;
             if (lexicalEnvironmentVariableDeclarations || lexicalEnvironmentFunctionDeclarations) {
@@ -59130,7 +76125,8 @@ var ts;
                     statements = lexicalEnvironmentFunctionDeclarations.slice();
                 }
                 if (lexicalEnvironmentVariableDeclarations) {
-                    var statement = ts.createVariableStatement(undefined, ts.createVariableDeclarationList(lexicalEnvironmentVariableDeclarations));
+                    var statement = ts.createVariableStatement(
+                    /*modifiers*/ undefined, ts.createVariableDeclarationList(lexicalEnvironmentVariableDeclarations));
                     if (!statements) {
                         statements = [statement];
                     }
@@ -59139,6 +76135,7 @@ var ts;
                     }
                 }
             }
+            // Restore the previous lexical environment.
             lexicalEnvironmentStackOffset--;
             lexicalEnvironmentVariableDeclarations = lexicalEnvironmentVariableDeclarationsStack[lexicalEnvironmentStackOffset];
             lexicalEnvironmentFunctionDeclarations = lexicalEnvironmentFunctionDeclarationsStack[lexicalEnvironmentStackOffset];
@@ -59149,24 +76146,26 @@ var ts;
             return statements;
         }
         function requestEmitHelper(helper) {
-            ts.Debug.assert(state > 0, "Cannot modify the transformation context during initialization.");
-            ts.Debug.assert(state < 2, "Cannot modify the transformation context after transformation has completed.");
+            ts.Debug.assert(state > 0 /* Uninitialized */, "Cannot modify the transformation context during initialization.");
+            ts.Debug.assert(state < 2 /* Completed */, "Cannot modify the transformation context after transformation has completed.");
             ts.Debug.assert(!helper.scoped, "Cannot request a scoped emit helper.");
             emitHelpers = ts.append(emitHelpers, helper);
         }
         function readEmitHelpers() {
-            ts.Debug.assert(state > 0, "Cannot modify the transformation context during initialization.");
-            ts.Debug.assert(state < 2, "Cannot modify the transformation context after transformation has completed.");
+            ts.Debug.assert(state > 0 /* Uninitialized */, "Cannot modify the transformation context during initialization.");
+            ts.Debug.assert(state < 2 /* Completed */, "Cannot modify the transformation context after transformation has completed.");
             var helpers = emitHelpers;
             emitHelpers = undefined;
             return helpers;
         }
         function dispose() {
-            if (state < 3) {
-                for (var _i = 0, nodes_5 = nodes; _i < nodes_5.length; _i++) {
-                    var node = nodes_5[_i];
+            if (state < 3 /* Disposed */) {
+                // Clean up emit nodes on parse tree
+                for (var _i = 0, nodes_4 = nodes; _i < nodes_4.length; _i++) {
+                    var node = nodes_4[_i];
                     ts.disposeEmitNodes(ts.getSourceFileOfNode(ts.getParseTreeNode(node)));
                 }
+                // Release references to external entries for GC purposes.
                 lexicalEnvironmentVariableDeclarations = undefined;
                 lexicalEnvironmentVariableDeclarationsStack = undefined;
                 lexicalEnvironmentFunctionDeclarations = undefined;
@@ -59174,14 +76173,17 @@ var ts;
                 onSubstituteNode = undefined;
                 onEmitNode = undefined;
                 emitHelpers = undefined;
-                state = 3;
+                // Prevent further use of the transformation result.
+                state = 3 /* Disposed */;
             }
         }
     }
     ts.transformNodes = transformNodes;
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
+    // Used for initialize lastEncodedSourceMapSpan and reset lastEncodedSourceMapSpan when updateLastEncodedAndRecordedSpans
     var defaultLastEncodedSourceMapSpan = {
         emittedLine: 1,
         emittedColumn: 1,
@@ -59194,14 +76196,20 @@ var ts;
         var extendedDiagnostics = compilerOptions.extendedDiagnostics;
         var currentSource;
         var currentSourceText;
-        var sourceMapDir;
+        var sourceMapDir; // The directory in which sourcemap will be
+        // Current source map file and its index in the sources list
         var sourceMapSourceIndex;
+        // Last recorded and encoded spans
         var lastRecordedSourceMapSpan;
         var lastEncodedSourceMapSpan;
         var lastEncodedNameIndex;
+        // Source map data
         var sourceMapData;
         var sourceMapDataList;
         var disabled = !(compilerOptions.sourceMap || compilerOptions.inlineSourceMap);
+        var completedSections;
+        var sectionStartLine;
+        var sectionStartColumn;
         return {
             initialize: initialize,
             reset: reset,
@@ -59212,11 +76220,21 @@ var ts;
             getText: getText,
             getSourceMappingURL: getSourceMappingURL,
         };
+        /**
+         * Skips trivia such as comments and white-space that can optionally overriden by the source map source
+         */
         function skipSourceTrivia(pos) {
             return currentSource.skipTrivia ? currentSource.skipTrivia(pos) : ts.skipTrivia(currentSourceText, pos);
         }
+        /**
+         * Initialize the SourceMapWriter for a new output file.
+         *
+         * @param filePath The path to the generated output file.
+         * @param sourceMapFilePath The path to the output source map file.
+         * @param sourceFileOrBundle The input source file or bundle for the program.
+         */
         function initialize(filePath, sourceMapFilePath, sourceFileOrBundle, outputSourceMapDataList) {
-            if (disabled || ts.fileExtensionIs(filePath, ".json")) {
+            if (disabled || ts.fileExtensionIs(filePath, ".json" /* Json */)) {
                 return;
             }
             if (sourceMapData) {
@@ -59225,10 +76243,16 @@ var ts;
             sourceMapDataList = outputSourceMapDataList;
             currentSource = undefined;
             currentSourceText = undefined;
+            // Current source map file and its index in the sources list
             sourceMapSourceIndex = -1;
+            // Last recorded and encoded spans
             lastRecordedSourceMapSpan = undefined;
             lastEncodedSourceMapSpan = defaultLastEncodedSourceMapSpan;
             lastEncodedNameIndex = 0;
+            // Initialize source map data
+            completedSections = [];
+            sectionStartLine = 1;
+            sectionStartColumn = 1;
             sourceMapData = {
                 sourceMapFilePath: sourceMapFilePath,
                 jsSourceMappingURL: !compilerOptions.inlineSourceMap ? ts.getBaseFileName(ts.normalizeSlashes(sourceMapFilePath)) : undefined,
@@ -59241,18 +76265,26 @@ var ts;
                 sourceMapSourcesContent: compilerOptions.inlineSources ? [] : undefined,
                 sourceMapDecodedMappings: []
             };
+            // Normalize source root and make sure it has trailing "/" so that it can be used to combine paths with the
+            // relative paths of the sources list in the sourcemap
             sourceMapData.sourceMapSourceRoot = ts.normalizeSlashes(sourceMapData.sourceMapSourceRoot);
-            if (sourceMapData.sourceMapSourceRoot.length && sourceMapData.sourceMapSourceRoot.charCodeAt(sourceMapData.sourceMapSourceRoot.length - 1) !== 47) {
+            if (sourceMapData.sourceMapSourceRoot.length && sourceMapData.sourceMapSourceRoot.charCodeAt(sourceMapData.sourceMapSourceRoot.length - 1) !== 47 /* slash */) {
                 sourceMapData.sourceMapSourceRoot += ts.directorySeparator;
             }
             if (compilerOptions.mapRoot) {
                 sourceMapDir = ts.normalizeSlashes(compilerOptions.mapRoot);
-                if (sourceFileOrBundle.kind === 274) {
+                if (sourceFileOrBundle.kind === 274 /* SourceFile */) { // emitting single module file
+                    // For modules or multiple emit files the mapRoot will have directory structure like the sources
+                    // So if src\a.ts and src\lib\b.ts are compiled together user would be moving the maps into mapRoot\a.js.map and mapRoot\lib\b.js.map
                     sourceMapDir = ts.getDirectoryPath(ts.getSourceFilePathInNewDir(sourceFileOrBundle, host, sourceMapDir));
                 }
                 if (!ts.isRootedDiskPath(sourceMapDir) && !ts.isUrl(sourceMapDir)) {
+                    // The relative paths are relative to the common directory
                     sourceMapDir = ts.combinePaths(host.getCommonSourceDirectory(), sourceMapDir);
-                    sourceMapData.jsSourceMappingURL = ts.getRelativePathToDirectoryOrUrl(ts.getDirectoryPath(ts.normalizePath(filePath)), ts.combinePaths(sourceMapDir, sourceMapData.jsSourceMappingURL), host.getCurrentDirectory(), host.getCanonicalFileName, true);
+                    sourceMapData.jsSourceMappingURL = ts.getRelativePathToDirectoryOrUrl(ts.getDirectoryPath(ts.normalizePath(filePath)), // get the relative sourceMapDir path based on jsFilePath
+                    ts.combinePaths(sourceMapDir, sourceMapData.jsSourceMappingURL), // this is where user expects to see sourceMap
+                    host.getCurrentDirectory(), host.getCanonicalFileName, 
+                    /*isAbsolutePathAnUrl*/ true);
                 }
                 else {
                     sourceMapData.jsSourceMappingURL = ts.combinePaths(sourceMapDir, sourceMapData.jsSourceMappingURL);
@@ -59262,10 +76294,14 @@ var ts;
                 sourceMapDir = ts.getDirectoryPath(ts.normalizePath(filePath));
             }
         }
+        /**
+         * Reset the SourceMapWriter to an empty state.
+         */
         function reset() {
             if (disabled) {
                 return;
             }
+            // Record source map data for the test harness.
             if (sourceMapDataList) {
                 sourceMapDataList.push(sourceMapData);
             }
@@ -59277,27 +76313,69 @@ var ts;
             lastEncodedNameIndex = undefined;
             sourceMapData = undefined;
             sourceMapDataList = undefined;
+            completedSections = undefined;
+            sectionStartLine = undefined;
+            sectionStartColumn = undefined;
         }
+        function captureSection() {
+            return {
+                version: 3,
+                file: sourceMapData.sourceMapFile,
+                sourceRoot: sourceMapData.sourceMapSourceRoot,
+                sources: sourceMapData.sourceMapSources,
+                names: sourceMapData.sourceMapNames,
+                mappings: sourceMapData.sourceMapMappings,
+                sourcesContent: sourceMapData.sourceMapSourcesContent,
+            };
+        }
+        function resetSectionalData() {
+            sourceMapData.sourceMapSources = [];
+            sourceMapData.sourceMapNames = [];
+            sourceMapData.sourceMapMappings = "";
+            sourceMapData.sourceMapSourcesContent = compilerOptions.inlineSources ? [] : undefined;
+        }
+        function generateMap() {
+            if (completedSections.length) {
+                captureSectionalSpanIfNeeded(/*reset*/ false);
+                return {
+                    version: 3,
+                    file: sourceMapData.sourceMapFile,
+                    sections: completedSections
+                };
+            }
+            else {
+                return captureSection();
+            }
+        }
+        // Encoding for sourcemap span
         function encodeLastRecordedSourceMapSpan() {
             if (!lastRecordedSourceMapSpan || lastRecordedSourceMapSpan === lastEncodedSourceMapSpan) {
                 return;
             }
             var prevEncodedEmittedColumn = lastEncodedSourceMapSpan.emittedColumn;
+            // Line/Comma delimiters
             if (lastEncodedSourceMapSpan.emittedLine === lastRecordedSourceMapSpan.emittedLine) {
+                // Emit comma to separate the entry
                 if (sourceMapData.sourceMapMappings) {
                     sourceMapData.sourceMapMappings += ",";
                 }
             }
             else {
+                // Emit line delimiters
                 for (var encodedLine = lastEncodedSourceMapSpan.emittedLine; encodedLine < lastRecordedSourceMapSpan.emittedLine; encodedLine++) {
                     sourceMapData.sourceMapMappings += ";";
                 }
                 prevEncodedEmittedColumn = 1;
             }
+            // 1. Relative Column 0 based
             sourceMapData.sourceMapMappings += base64VLQFormatEncode(lastRecordedSourceMapSpan.emittedColumn - prevEncodedEmittedColumn);
+            // 2. Relative sourceIndex
             sourceMapData.sourceMapMappings += base64VLQFormatEncode(lastRecordedSourceMapSpan.sourceIndex - lastEncodedSourceMapSpan.sourceIndex);
+            // 3. Relative sourceLine 0 based
             sourceMapData.sourceMapMappings += base64VLQFormatEncode(lastRecordedSourceMapSpan.sourceLine - lastEncodedSourceMapSpan.sourceLine);
+            // 4. Relative sourceColumn 0 based
             sourceMapData.sourceMapMappings += base64VLQFormatEncode(lastRecordedSourceMapSpan.sourceColumn - lastEncodedSourceMapSpan.sourceColumn);
+            // 5. Relative namePosition 0 based
             if (lastRecordedSourceMapSpan.nameIndex >= 0) {
                 ts.Debug.assert(false, "We do not support name index right now, Make sure to update updateLastEncodedAndRecordedSpans when we start using this");
                 sourceMapData.sourceMapMappings += base64VLQFormatEncode(lastRecordedSourceMapSpan.nameIndex - lastEncodedNameIndex);
@@ -59306,6 +76384,14 @@ var ts;
             lastEncodedSourceMapSpan = lastRecordedSourceMapSpan;
             sourceMapData.sourceMapDecodedMappings.push(lastEncodedSourceMapSpan);
         }
+        /**
+         * Emits a mapping.
+         *
+         * If the position is synthetic (undefined or a negative value), no mapping will be
+         * created.
+         *
+         * @param pos The position.
+         */
         function emitPos(pos) {
             if (disabled || ts.positionIsSynthesized(pos) || isJsonSourceMapSource(currentSource)) {
                 return;
@@ -59314,17 +76400,21 @@ var ts;
                 ts.performance.mark("beforeSourcemap");
             }
             var sourceLinePos = ts.getLineAndCharacterOfPosition(currentSource, pos);
+            // Convert the location to be one-based.
             sourceLinePos.line++;
             sourceLinePos.character++;
-            var emittedLine = writer.getLine();
-            var emittedColumn = writer.getColumn();
+            var emittedLine = writer.getLine() - sectionStartLine + 1;
+            var emittedColumn = emittedLine === 0 ? (writer.getColumn() - sectionStartColumn + 1) : writer.getColumn();
+            // If this location wasn't recorded or the location in source is going backwards, record the span
             if (!lastRecordedSourceMapSpan ||
                 lastRecordedSourceMapSpan.emittedLine !== emittedLine ||
                 lastRecordedSourceMapSpan.emittedColumn !== emittedColumn ||
                 (lastRecordedSourceMapSpan.sourceIndex === sourceMapSourceIndex &&
                     (lastRecordedSourceMapSpan.sourceLine > sourceLinePos.line ||
                         (lastRecordedSourceMapSpan.sourceLine === sourceLinePos.line && lastRecordedSourceMapSpan.sourceColumn > sourceLinePos.character)))) {
+                // Encode the last recordedSpan before assigning new
                 encodeLastRecordedSourceMapSpan();
+                // New span
                 lastRecordedSourceMapSpan = {
                     emittedLine: emittedLine,
                     emittedColumn: emittedColumn,
@@ -59334,6 +76424,7 @@ var ts;
                 };
             }
             else {
+                // Take the new pos instead since there is no change in emittedLine and column since last location
                 lastRecordedSourceMapSpan.sourceLine = sourceLinePos.line;
                 lastRecordedSourceMapSpan.sourceColumn = sourceLinePos.character;
                 lastRecordedSourceMapSpan.sourceIndex = sourceMapSourceIndex;
@@ -59343,29 +76434,72 @@ var ts;
                 ts.performance.measure("Source Map", "beforeSourcemap", "afterSourcemap");
             }
         }
+        function captureSectionalSpanIfNeeded(reset) {
+            if (lastRecordedSourceMapSpan && lastRecordedSourceMapSpan === lastEncodedSourceMapSpan) { // If we've recorded some spans, save them
+                completedSections.push({ offset: { line: sectionStartLine - 1, column: sectionStartColumn - 1 }, map: captureSection() });
+                if (reset) {
+                    resetSectionalData();
+                }
+            }
+        }
+        /**
+         * Emits a node with possible leading and trailing source maps.
+         *
+         * @param hint A hint as to the intended usage of the node.
+         * @param node The node to emit.
+         * @param emitCallback The callback used to emit the node.
+         */
         function emitNodeWithSourceMap(hint, node, emitCallback) {
             if (disabled || ts.isInJsonFile(node)) {
                 return emitCallback(hint, node);
             }
             if (node) {
+                if (ts.isUnparsedSource(node) && node.sourceMapText !== undefined) {
+                    captureSectionalSpanIfNeeded(/*reset*/ true);
+                    var text = node.sourceMapText;
+                    var parsed = void 0;
+                    try {
+                        parsed = JSON.parse(text);
+                    }
+                    catch (_a) {
+                        // empty
+                    }
+                    var offset = { line: writer.getLine() - 1, column: writer.getColumn() - 1 };
+                    completedSections.push(parsed
+                        ? {
+                            offset: offset,
+                            map: parsed
+                        }
+                        : {
+                            offset: offset,
+                            // This is just passes the buck on sourcemaps we don't really understand, instead of issuing an error (which would be difficult this late)
+                            url: "data:application/json;charset=utf-8;base64," + ts.base64encode(ts.sys, text)
+                        });
+                    var emitResult = emitCallback(hint, node);
+                    sectionStartLine = writer.getLine();
+                    sectionStartColumn = writer.getColumn();
+                    lastRecordedSourceMapSpan = undefined;
+                    lastEncodedSourceMapSpan = defaultLastEncodedSourceMapSpan;
+                    return emitResult;
+                }
                 var emitNode = node.emitNode;
-                var emitFlags = emitNode && emitNode.flags || 0;
+                var emitFlags = emitNode && emitNode.flags || 0 /* None */;
                 var range = emitNode && emitNode.sourceMapRange;
-                var _a = range || node, pos = _a.pos, end = _a.end;
+                var _b = range || node, pos = _b.pos, end = _b.end;
                 var source = range && range.source;
                 var oldSource = currentSource;
                 if (source === oldSource)
                     source = undefined;
                 if (source)
                     setSourceFile(source);
-                if (node.kind !== 300
-                    && (emitFlags & 16) === 0
+                if (node.kind !== 300 /* NotEmittedStatement */
+                    && (emitFlags & 16 /* NoLeadingSourceMap */) === 0
                     && pos >= 0) {
                     emitPos(skipSourceTrivia(pos));
                 }
                 if (source)
                     setSourceFile(oldSource);
-                if (emitFlags & 64) {
+                if (emitFlags & 64 /* NoNestedSourceMaps */) {
                     disabled = true;
                     emitCallback(hint, node);
                     disabled = false;
@@ -59375,8 +76509,8 @@ var ts;
                 }
                 if (source)
                     setSourceFile(source);
-                if (node.kind !== 300
-                    && (emitFlags & 32) === 0
+                if (node.kind !== 300 /* NotEmittedStatement */
+                    && (emitFlags & 32 /* NoTrailingSourceMap */) === 0
                     && end >= 0) {
                     emitPos(end);
                 }
@@ -59384,28 +76518,41 @@ var ts;
                     setSourceFile(oldSource);
             }
         }
+        /**
+         * Emits a token of a node with possible leading and trailing source maps.
+         *
+         * @param node The node containing the token.
+         * @param token The token to emit.
+         * @param tokenStartPos The start pos of the token.
+         * @param emitCallback The callback used to emit the token.
+         */
         function emitTokenWithSourceMap(node, token, writer, tokenPos, emitCallback) {
             if (disabled || ts.isInJsonFile(node)) {
                 return emitCallback(token, writer, tokenPos);
             }
             var emitNode = node && node.emitNode;
-            var emitFlags = emitNode && emitNode.flags || 0;
+            var emitFlags = emitNode && emitNode.flags || 0 /* None */;
             var range = emitNode && emitNode.tokenSourceMapRanges && emitNode.tokenSourceMapRanges[token];
             tokenPos = skipSourceTrivia(range ? range.pos : tokenPos);
-            if ((emitFlags & 128) === 0 && tokenPos >= 0) {
+            if ((emitFlags & 128 /* NoTokenLeadingSourceMaps */) === 0 && tokenPos >= 0) {
                 emitPos(tokenPos);
             }
             tokenPos = emitCallback(token, writer, tokenPos);
             if (range)
                 tokenPos = range.end;
-            if ((emitFlags & 256) === 0 && tokenPos >= 0) {
+            if ((emitFlags & 256 /* NoTokenTrailingSourceMaps */) === 0 && tokenPos >= 0) {
                 emitPos(tokenPos);
             }
             return tokenPos;
         }
         function isJsonSourceMapSource(sourceFile) {
-            return ts.fileExtensionIs(sourceFile.fileName, ".json");
+            return ts.fileExtensionIs(sourceFile.fileName, ".json" /* Json */);
         }
+        /**
+         * Set the current source file.
+         *
+         * @param sourceFile The source file.
+         */
         function setSourceFile(sourceFile) {
             if (disabled) {
                 return;
@@ -59415,38 +76562,42 @@ var ts;
             if (isJsonSourceMapSource(sourceFile)) {
                 return;
             }
+            // Add the file to tsFilePaths
+            // If sourceroot option: Use the relative path corresponding to the common directory path
+            // otherwise source locations relative to map file location
             var sourcesDirectoryPath = compilerOptions.sourceRoot ? host.getCommonSourceDirectory() : sourceMapDir;
-            var source = ts.getRelativePathToDirectoryOrUrl(sourcesDirectoryPath, currentSource.fileName, host.getCurrentDirectory(), host.getCanonicalFileName, true);
+            var source = ts.getRelativePathToDirectoryOrUrl(sourcesDirectoryPath, currentSource.fileName, host.getCurrentDirectory(), host.getCanonicalFileName, 
+            /*isAbsolutePathAnUrl*/ true);
             sourceMapSourceIndex = sourceMapData.sourceMapSources.indexOf(source);
             if (sourceMapSourceIndex === -1) {
                 sourceMapSourceIndex = sourceMapData.sourceMapSources.length;
                 sourceMapData.sourceMapSources.push(source);
+                // The one that can be used from program to get the actual source file
                 sourceMapData.inputSourceFileNames.push(currentSource.fileName);
                 if (compilerOptions.inlineSources) {
                     sourceMapData.sourceMapSourcesContent.push(currentSource.text);
                 }
             }
         }
+        /**
+         * Gets the text for the source map.
+         */
         function getText() {
             if (disabled || isJsonSourceMapSource(currentSource)) {
-                return undefined;
+                return undefined; // TODO: GH#18217
             }
             encodeLastRecordedSourceMapSpan();
-            return JSON.stringify({
-                version: 3,
-                file: sourceMapData.sourceMapFile,
-                sourceRoot: sourceMapData.sourceMapSourceRoot,
-                sources: sourceMapData.sourceMapSources,
-                names: sourceMapData.sourceMapNames,
-                mappings: sourceMapData.sourceMapMappings,
-                sourcesContent: sourceMapData.sourceMapSourcesContent,
-            });
+            return JSON.stringify(generateMap());
         }
+        /**
+         * Gets the SourceMappingURL for the source map.
+         */
         function getSourceMappingURL() {
             if (disabled || isJsonSourceMapSource(currentSource)) {
-                return undefined;
+                return undefined; // TODO: GH#18217
             }
             if (compilerOptions.inlineSourceMap) {
+                // Encode the sourceMap into the sourceMap url
                 var base64SourceMapText = ts.base64encode(ts.sys, getText());
                 return sourceMapData.jsSourceMappingURL = "data:application/json;base64," + base64SourceMapText;
             }
@@ -59464,17 +76615,24 @@ var ts;
         throw TypeError(inValue + ": not a 64 based value");
     }
     function base64VLQFormatEncode(inValue) {
+        // Add a new least significant bit that has the sign of the value.
+        // if negative number the least significant bit that gets added to the number has value 1
+        // else least significant bit value that gets added is 0
+        // eg. -1 changes to binary : 01 [1] => 3
+        //     +1 changes to binary : 01 [0] => 2
         if (inValue < 0) {
             inValue = ((-inValue) << 1) + 1;
         }
         else {
             inValue = inValue << 1;
         }
+        // Encode 5 bits at a time starting from least significant bits
         var encodedStr = "";
         do {
-            var currentDigit = inValue & 31;
+            var currentDigit = inValue & 31; // 11111
             inValue = inValue >> 5;
             if (inValue > 0) {
+                // There are still more digits to decode, set the msb (6th bit)
                 currentDigit = currentDigit | 32;
             }
             encodedStr = encodedStr + base64FormatEncode(currentDigit);
@@ -59482,6 +76640,7 @@ var ts;
         return encodedStr;
     }
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     function createCommentWriter(printerOptions, emitPos) {
@@ -59517,18 +76676,24 @@ var ts;
                 var emitFlags = emitNode && emitNode.flags || 0;
                 var _a = emitNode && emitNode.commentRange || node, pos = _a.pos, end = _a.end;
                 if ((pos < 0 && end < 0) || (pos === end)) {
+                    // Both pos and end are synthesized, so just emit the node without comments.
                     emitNodeWithSynthesizedComments(hint, node, emitNode, emitFlags, emitCallback);
                 }
                 else {
                     if (extendedDiagnostics) {
                         ts.performance.mark("preEmitNodeWithComment");
                     }
-                    var isEmittedNode = node.kind !== 300;
-                    var skipLeadingComments = pos < 0 || (emitFlags & 512) !== 0 || node.kind === 10;
-                    var skipTrailingComments = end < 0 || (emitFlags & 1024) !== 0 || node.kind === 10;
+                    var isEmittedNode = node.kind !== 300 /* NotEmittedStatement */;
+                    // We have to explicitly check that the node is JsxText because if the compilerOptions.jsx is "preserve" we will not do any transformation.
+                    // It is expensive to walk entire tree just to set one kind of node to have no comments.
+                    var skipLeadingComments = pos < 0 || (emitFlags & 512 /* NoLeadingComments */) !== 0 || node.kind === 10 /* JsxText */;
+                    var skipTrailingComments = end < 0 || (emitFlags & 1024 /* NoTrailingComments */) !== 0 || node.kind === 10 /* JsxText */;
+                    // Emit leading comments if the position is not synthesized and the node
+                    // has not opted out from emitting leading comments.
                     if (!skipLeadingComments) {
                         emitLeadingComments(pos, isEmittedNode);
                     }
+                    // Save current container state on the stack.
                     var savedContainerPos = containerPos;
                     var savedContainerEnd = containerEnd;
                     var savedDeclarationListContainerEnd = declarationListContainerEnd;
@@ -59537,7 +76702,9 @@ var ts;
                     }
                     if (!skipTrailingComments) {
                         containerEnd = end;
-                        if (node.kind === 233) {
+                        // To avoid invalid comment emit in a down-level binding pattern, we
+                        // keep track of the last declaration list container's end
+                        if (node.kind === 233 /* VariableDeclarationList */) {
                             declarationListContainerEnd = end;
                         }
                     }
@@ -59548,9 +76715,12 @@ var ts;
                     if (extendedDiagnostics) {
                         ts.performance.mark("postEmitNodeWithComment");
                     }
+                    // Restore previous container state.
                     containerPos = savedContainerPos;
                     containerEnd = savedContainerEnd;
                     declarationListContainerEnd = savedDeclarationListContainerEnd;
+                    // Emit trailing comments if the position is not synthesized and the node
+                    // has not opted out from emitting leading comments and is an emitted node.
                     if (!skipTrailingComments && isEmittedNode) {
                         emitTrailingComments(end);
                     }
@@ -59584,11 +76754,11 @@ var ts;
             }
         }
         function emitLeadingSynthesizedComment(comment) {
-            if (comment.kind === 2) {
+            if (comment.kind === 2 /* SingleLineCommentTrivia */) {
                 writer.writeLine();
             }
             writeSynthesizedComment(comment);
-            if (comment.hasTrailingNewLine || comment.kind === 2) {
+            if (comment.hasTrailingNewLine || comment.kind === 2 /* SingleLineCommentTrivia */) {
                 writer.writeLine();
             }
             else {
@@ -59606,16 +76776,16 @@ var ts;
         }
         function writeSynthesizedComment(comment) {
             var text = formatSynthesizedComment(comment);
-            var lineMap = comment.kind === 3 ? ts.computeLineStarts(text) : undefined;
+            var lineMap = comment.kind === 3 /* MultiLineCommentTrivia */ ? ts.computeLineStarts(text) : undefined;
             ts.writeCommentRange(text, lineMap, writer, 0, text.length, newLine);
         }
         function formatSynthesizedComment(comment) {
-            return comment.kind === 3
+            return comment.kind === 3 /* MultiLineCommentTrivia */
                 ? "/*" + comment.text + "*/"
                 : "//" + comment.text;
         }
         function emitNodeWithNestedComments(hint, node, emitFlags, emitCallback) {
-            if (emitFlags & 2048) {
+            if (emitFlags & 2048 /* NoNestedComments */) {
                 disabled = true;
                 emitCallback(hint, node);
                 disabled = false;
@@ -59630,15 +76800,15 @@ var ts;
             }
             var pos = detachedRange.pos, end = detachedRange.end;
             var emitFlags = ts.getEmitFlags(node);
-            var skipLeadingComments = pos < 0 || (emitFlags & 512) !== 0;
-            var skipTrailingComments = disabled || end < 0 || (emitFlags & 1024) !== 0;
+            var skipLeadingComments = pos < 0 || (emitFlags & 512 /* NoLeadingComments */) !== 0;
+            var skipTrailingComments = disabled || end < 0 || (emitFlags & 1024 /* NoTrailingComments */) !== 0;
             if (!skipLeadingComments) {
                 emitDetachedCommentsAndUpdateCommentsInfo(detachedRange);
             }
             if (extendedDiagnostics) {
                 ts.performance.measure("commentTime", "preEmitBodyWithDetachedComments");
             }
-            if (emitFlags & 2048 && !disabled) {
+            if (emitFlags & 2048 /* NoNestedComments */ && !disabled) {
                 disabled = true;
                 emitCallback(node);
                 disabled = false;
@@ -59650,7 +76820,7 @@ var ts;
                 ts.performance.mark("beginEmitBodyWithDetachedCommetns");
             }
             if (!skipTrailingComments) {
-                emitLeadingComments(detachedRange.end, true);
+                emitLeadingComments(detachedRange.end, /*isEmittedNode*/ true);
                 if (hasWrittenComment && !writer.isAtStartOfLine()) {
                     writer.writeLine();
                 }
@@ -59665,6 +76835,14 @@ var ts;
                 forEachLeadingCommentToEmit(pos, emitLeadingComment);
             }
             else if (pos === 0) {
+                // If the node will not be emitted in JS, remove all the comments(normal, pinned and ///) associated with the node,
+                // unless it is a triple slash comment at the top of the file.
+                // For Example:
+                //      /// <reference-path ...>
+                //      declare var x;
+                //      /// <reference-path ...>
+                //      interface F {}
+                //  The first /// will NOT be removed while the second one will be removed even though both node will not be emitted
                 forEachLeadingCommentToEmit(pos, emitTripleSlashLeadingComment);
             }
         }
@@ -59686,6 +76864,7 @@ var ts;
                 ts.emitNewLineBeforeLeadingCommentOfPosition(currentLineMap, writer, rangePos, commentPos);
                 hasWrittenComment = true;
             }
+            // Leading comments are emitted at /*leading comment1 */space/*leading comment*/space
             if (emitPos)
                 emitPos(commentPos);
             ts.writeCommentRange(currentText, currentLineMap, writer, commentPos, commentEnd, newLine);
@@ -59694,7 +76873,7 @@ var ts;
             if (hasTrailingNewLine) {
                 writer.writeLine();
             }
-            else if (kind === 3) {
+            else if (kind === 3 /* MultiLineCommentTrivia */) {
                 writer.write(" ");
             }
         }
@@ -59702,7 +76881,7 @@ var ts;
             if (disabled || pos === -1) {
                 return;
             }
-            emitLeadingComments(pos, true);
+            emitLeadingComments(pos, /*isEmittedNode*/ true);
         }
         function emitTrailingComments(pos) {
             forEachTrailingCommentToEmit(pos, emitTrailingComment);
@@ -59710,6 +76889,7 @@ var ts;
         function emitTrailingComment(commentPos, commentEnd, _kind, hasTrailingNewLine) {
             if (!shouldWriteComment(currentText, commentPos))
                 return;
+            // trailing comments are emitted at space/*trailing comment1 */space/*trailing comment2*/
             if (!writer.isAtStartOfLine()) {
                 writer.write(" ");
             }
@@ -59735,6 +76915,7 @@ var ts;
             }
         }
         function emitTrailingCommentOfPosition(commentPos, commentEnd, _kind, hasTrailingNewLine) {
+            // trailing comments of a position are emitted at /*trailing comment1 */space/*trailing comment*/space
             if (emitPos)
                 emitPos(commentPos);
             ts.writeCommentRange(currentText, currentLineMap, writer, commentPos, commentEnd, newLine);
@@ -59748,16 +76929,18 @@ var ts;
             }
         }
         function forEachLeadingCommentToEmit(pos, cb) {
+            // Emit the leading comments only if the container's pos doesn't match because the container should take care of emitting these comments
             if (containerPos === -1 || pos !== containerPos) {
                 if (hasDetachedComments(pos)) {
                     forEachLeadingCommentWithoutDetachedComments(cb);
                 }
                 else {
-                    ts.forEachLeadingCommentRange(currentText, pos, cb, pos);
+                    ts.forEachLeadingCommentRange(currentText, pos, cb, /*state*/ pos);
                 }
             }
         }
         function forEachTrailingCommentToEmit(end, cb) {
+            // Emit the trailing comments only if the container's end doesn't match because the container should take care of emitting these comments
             if (containerEnd === -1 || (end !== containerEnd && end !== declarationListContainerEnd)) {
                 ts.forEachTrailingCommentRange(currentText, end, cb);
             }
@@ -59781,6 +76964,7 @@ var ts;
             return detachedCommentsInfo !== undefined && ts.last(detachedCommentsInfo).nodePos === pos;
         }
         function forEachLeadingCommentWithoutDetachedComments(cb) {
+            // get the leading comments from detachedPos
             var pos = ts.last(detachedCommentsInfo).detachedCommentEndPos;
             if (detachedCommentsInfo.length - 1) {
                 detachedCommentsInfo.pop();
@@ -59788,7 +76972,7 @@ var ts;
             else {
                 detachedCommentsInfo = undefined;
             }
-            ts.forEachLeadingCommentRange(currentText, pos, cb, pos);
+            ts.forEachLeadingCommentRange(currentText, pos, cb, /*state*/ pos);
         }
         function emitDetachedCommentsAndUpdateCommentsInfo(range) {
             var currentDetachedCommentInfo = ts.emitDetachedComments(currentText, currentLineMap, writer, writeComment, range, newLine, disabled);
@@ -59810,6 +76994,11 @@ var ts;
             if (emitPos)
                 emitPos(commentEnd);
         }
+        /**
+         * Determine if the given comment is a triple-slash
+         *
+         * @return true if the comment is a triple-slash comment else false
+         */
         function isTripleSlashComment(commentPos, commentEnd) {
             return ts.isRecognizedTripleSlashComment(currentText, commentPos, commentEnd);
         }
@@ -59820,6 +77009,16 @@ var ts;
 (function (ts) {
     var infoExtension = ".tsbundleinfo";
     var brackets = createBracketsMap();
+    /*@internal*/
+    /**
+     * Iterates over the source files that are expected to have an emit output.
+     *
+     * @param host An EmitHost.
+     * @param action The action to execute.
+     * @param sourceFilesOrTargetSourceFile
+     *   If an array, the full list of source files to emit.
+     *   Else, calls `getSourceFilesToEmit` with the (optional) target source file to determine the list of source files to emit.
+     */
     function forEachEmittedFile(host, action, sourceFilesOrTargetSourceFile, emitOnlyDtsFiles) {
         if (emitOnlyDtsFiles === void 0) { emitOnlyDtsFiles = false; }
         var sourceFiles = ts.isArray(sourceFilesOrTargetSourceFile) ? sourceFilesOrTargetSourceFile : ts.getSourceFilesToEmit(host, sourceFilesOrTargetSourceFile);
@@ -59844,12 +77043,13 @@ var ts;
         }
     }
     ts.forEachEmittedFile = forEachEmittedFile;
+    /*@internal*/
     function getOutputPathsFor(sourceFile, host, forceDtsPaths) {
         var options = host.getCompilerOptions();
-        if (sourceFile.kind === 275) {
+        if (sourceFile.kind === 275 /* Bundle */) {
             var jsFilePath = options.outFile || options.out;
             var sourceMapFilePath = getSourceMapFilePath(jsFilePath, options);
-            var declarationFilePath = (forceDtsPaths || options.declaration) ? ts.removeFileExtension(jsFilePath) + ".d.ts" : undefined;
+            var declarationFilePath = (forceDtsPaths || options.declaration) ? ts.removeFileExtension(jsFilePath) + ".d.ts" /* Dts */ : undefined;
             var declarationMapPath = ts.getAreDeclarationMapsEnabled(options) ? declarationFilePath + ".map" : undefined;
             var bundleInfoPath = options.references && jsFilePath ? (ts.removeFileExtension(jsFilePath) + infoExtension) : undefined;
             return { jsFilePath: jsFilePath, sourceMapFilePath: sourceMapFilePath, declarationFilePath: declarationFilePath, declarationMapPath: declarationMapPath, bundleInfoPath: bundleInfoPath };
@@ -59857,6 +77057,7 @@ var ts;
         else {
             var jsFilePath = ts.getOwnEmitOutputFilePath(sourceFile, host, getOutputExtension(sourceFile, options));
             var sourceMapFilePath = ts.isJsonSourceFile(sourceFile) ? undefined : getSourceMapFilePath(jsFilePath, options);
+            // For legacy reasons (ie, we have baselines capturing the behavior), js files don't report a .d.ts output path - this would only matter if `declaration` and `allowJs` were both on, which is currently an error
             var isJs = ts.isSourceFileJavaScript(sourceFile);
             var declarationFilePath = ((forceDtsPaths || options.declaration) && !isJs) ? ts.getDeclarationEmitOutputFilePath(sourceFile, host) : undefined;
             var declarationMapPath = ts.getAreDeclarationMapsEnabled(options) ? declarationFilePath + ".map" : undefined;
@@ -59873,23 +77074,30 @@ var ts;
             totalLength: -1
         };
     }
+    // JavaScript files are always LanguageVariant.JSX, as JSX syntax is allowed in .js files also.
+    // So for JavaScript files, '.jsx' is only emitted if the input was '.jsx', and JsxEmit.Preserve.
+    // For TypeScript, the only time to emit with a '.jsx' extension, is on JSX input, and JsxEmit.Preserve
+    /* @internal */
     function getOutputExtension(sourceFile, options) {
         if (ts.isJsonSourceFile(sourceFile)) {
-            return ".json";
+            return ".json" /* Json */;
         }
-        if (options.jsx === 1) {
+        if (options.jsx === 1 /* Preserve */) {
             if (ts.isSourceFileJavaScript(sourceFile)) {
-                if (ts.fileExtensionIs(sourceFile.fileName, ".jsx")) {
-                    return ".jsx";
+                if (ts.fileExtensionIs(sourceFile.fileName, ".jsx" /* Jsx */)) {
+                    return ".jsx" /* Jsx */;
                 }
             }
-            else if (sourceFile.languageVariant === 1) {
-                return ".jsx";
+            else if (sourceFile.languageVariant === 1 /* JSX */) {
+                // TypeScript source file preserving JSX syntax
+                return ".jsx" /* Jsx */;
             }
         }
-        return ".js";
+        return ".js" /* Js */;
     }
     ts.getOutputExtension = getOutputExtension;
+    /*@internal*/
+    // targetSourceFile is when users only want one file in entire project to be emitted. This is used in compileOnSave feature
     function emitFiles(resolver, host, targetSourceFile, emitOnlyDtsFiles, transformers, declarationTransformers) {
         var compilerOptions = host.getCompilerOptions();
         var sourceMapDataList = (compilerOptions.sourceMap || compilerOptions.inlineSourceMap || ts.getAreDeclarationMapsEnabled(compilerOptions)) ? [] : undefined;
@@ -59906,6 +77114,7 @@ var ts;
         });
         var bundleInfo = createDefaultBundleInfo();
         var emitSkipped = false;
+        // Emit each output file
         ts.performance.mark("beforePrint");
         forEachEmittedFile(host, emitSourceFileOrBundle, ts.getSourceFilesToEmit(host, targetSourceFile), emitOnlyDtsFiles);
         ts.performance.measure("printTime", "beforePrint");
@@ -59935,6 +77144,7 @@ var ts;
             }
         }
         function emitJsFileOrBundle(sourceFileOrBundle, jsFilePath, sourceMapFilePath, bundleInfoPath) {
+            // Make sure not to write js file and source map file if any of them cannot be written
             if (host.isEmitBlocked(jsFilePath) || compilerOptions.noEmit || compilerOptions.emitDeclarationOnly) {
                 emitSkipped = true;
                 return;
@@ -59942,18 +77152,25 @@ var ts;
             if (emitOnlyDtsFiles) {
                 return;
             }
-            var transform = ts.transformNodes(resolver, host, compilerOptions, [sourceFileOrBundle], transformers, false);
+            // Transform the source files
+            var transform = ts.transformNodes(resolver, host, compilerOptions, [sourceFileOrBundle], transformers, /*allowDtsFiles*/ false);
+            // Create a printer to print the nodes
             var printer = createPrinter(__assign({}, compilerOptions, { noEmitHelpers: compilerOptions.noEmitHelpers }), {
+                // resolver hooks
                 hasGlobalName: resolver.hasGlobalName,
+                // transform hooks
                 onEmitNode: transform.emitNodeWithNotification,
                 substituteNode: transform.substituteNode,
+                // sourcemap hooks
                 onEmitSourceMapOfNode: sourceMap.emitNodeWithSourceMap,
                 onEmitSourceMapOfToken: sourceMap.emitTokenWithSourceMap,
                 onEmitSourceMapOfPosition: sourceMap.emitPos,
+                // emitter hooks
                 onSetSourceFile: setSourceFile,
             });
             ts.Debug.assert(transform.transformed.length === 1, "Should only see one output from the transform");
             printSourceFileOrBundle(jsFilePath, sourceMapFilePath, transform.transformed[0], bundleInfoPath, printer, sourceMap);
+            // Clean up emit nodes on parse tree
             transform.dispose();
         }
         function emitDeclarationFileOrBundle(sourceFileOrBundle, declarationFilePath, declarationMapPath) {
@@ -59961,9 +77178,10 @@ var ts;
                 return;
             }
             var sourceFiles = ts.isSourceFile(sourceFileOrBundle) ? [sourceFileOrBundle] : sourceFileOrBundle.sourceFiles;
+            // Setup and perform the transformation to retrieve declarations from the input files
             var nonJsFiles = ts.filter(sourceFiles, ts.isSourceFileNotJavaScript);
             var inputListOrBundle = (compilerOptions.outFile || compilerOptions.out) ? [ts.createBundle(nonJsFiles, !ts.isSourceFile(sourceFileOrBundle) ? sourceFileOrBundle.prepends : undefined)] : nonJsFiles;
-            var declarationTransform = ts.transformNodes(resolver, host, compilerOptions, inputListOrBundle, ts.concatenate([ts.transformDeclarations], declarationTransformers), false);
+            var declarationTransform = ts.transformNodes(resolver, host, compilerOptions, inputListOrBundle, ts.concatenate([ts.transformDeclarations], declarationTransformers), /*allowDtsFiles*/ false);
             if (ts.length(declarationTransform.diagnostics)) {
                 for (var _a = 0, _b = declarationTransform.diagnostics; _a < _b.length; _a++) {
                     var diagnostic = _b[_a];
@@ -59971,11 +77189,14 @@ var ts;
                 }
             }
             var declarationPrinter = createPrinter(__assign({}, compilerOptions, { onlyPrintJsDocStyle: true, noEmitHelpers: true }), {
+                // resolver hooks
                 hasGlobalName: resolver.hasGlobalName,
+                // sourcemap hooks
                 onEmitSourceMapOfNode: declarationSourceMap.emitNodeWithSourceMap,
                 onEmitSourceMapOfToken: declarationSourceMap.emitTokenWithSourceMap,
                 onEmitSourceMapOfPosition: declarationSourceMap.emitPos,
                 onSetSourceFile: setSourceFileForDeclarationSourceMaps,
+                // transform hooks
                 onEmitNode: declarationTransform.emitNodeWithNotification,
                 substituteNode: declarationTransform.substituteNode,
             });
@@ -59983,13 +77204,13 @@ var ts;
             emitSkipped = emitSkipped || declBlocked;
             if (!declBlocked || emitOnlyDtsFiles) {
                 ts.Debug.assert(declarationTransform.transformed.length === 1, "Should only see one output from the decl transform");
-                printSourceFileOrBundle(declarationFilePath, declarationMapPath, declarationTransform.transformed[0], undefined, declarationPrinter, declarationSourceMap);
+                printSourceFileOrBundle(declarationFilePath, declarationMapPath, declarationTransform.transformed[0], /* bundleInfopath*/ undefined, declarationPrinter, declarationSourceMap);
             }
             declarationTransform.dispose();
         }
         function printSourceFileOrBundle(jsFilePath, sourceMapFilePath, sourceFileOrBundle, bundleInfoPath, printer, mapRecorder) {
-            var bundle = sourceFileOrBundle.kind === 275 ? sourceFileOrBundle : undefined;
-            var sourceFile = sourceFileOrBundle.kind === 274 ? sourceFileOrBundle : undefined;
+            var bundle = sourceFileOrBundle.kind === 275 /* Bundle */ ? sourceFileOrBundle : undefined;
+            var sourceFile = sourceFileOrBundle.kind === 274 /* SourceFile */ ? sourceFileOrBundle : undefined;
             var sourceFiles = bundle ? bundle.sourceFiles : [sourceFile];
             mapRecorder.initialize(jsFilePath, sourceMapFilePath || "", sourceFileOrBundle, sourceMapDataList);
             if (bundle) {
@@ -60001,16 +77222,20 @@ var ts;
             writer.writeLine();
             var sourceMappingURL = mapRecorder.getSourceMappingURL();
             if (sourceMappingURL) {
-                writer.write("//# " + "sourceMappingURL" + "=" + sourceMappingURL);
+                writer.write("//# " + "sourceMappingURL" + "=" + sourceMappingURL); // Sometimes tools can sometimes see this line as a source mapping url comment
             }
+            // Write the source map
             if (sourceMapFilePath) {
-                ts.writeFile(host, emitterDiagnostics, sourceMapFilePath, mapRecorder.getText(), false, sourceFiles);
+                ts.writeFile(host, emitterDiagnostics, sourceMapFilePath, mapRecorder.getText(), /*writeByteOrderMark*/ false, sourceFiles);
             }
+            // Write the output file
             ts.writeFile(host, emitterDiagnostics, jsFilePath, writer.getText(), !!compilerOptions.emitBOM, sourceFiles);
+            // Write bundled offset information if applicable
             if (bundleInfoPath) {
                 bundleInfo.totalLength = writer.getTextPos();
-                ts.writeFile(host, emitterDiagnostics, bundleInfoPath, JSON.stringify(bundleInfo, undefined, 2), false);
+                ts.writeFile(host, emitterDiagnostics, bundleInfoPath, JSON.stringify(bundleInfo, undefined, 2), /*writeByteOrderMark*/ false);
             }
+            // Reset state
             mapRecorder.reset();
             writer.clear();
             bundleInfo = createDefaultBundleInfo();
@@ -60023,6 +77248,13 @@ var ts;
         }
     }
     ts.emitFiles = emitFiles;
+    var PipelinePhase;
+    (function (PipelinePhase) {
+        PipelinePhase[PipelinePhase["Notification"] = 0] = "Notification";
+        PipelinePhase[PipelinePhase["Comments"] = 1] = "Comments";
+        PipelinePhase[PipelinePhase["SourceMaps"] = 2] = "SourceMaps";
+        PipelinePhase[PipelinePhase["Emit"] = 3] = "Emit";
+    })(PipelinePhase || (PipelinePhase = {}));
     function createPrinter(printerOptions, handlers) {
         if (printerOptions === void 0) { printerOptions = {}; }
         if (handlers === void 0) { handlers = {}; }
@@ -60031,13 +77263,13 @@ var ts;
         var comments = ts.createCommentWriter(printerOptions, onEmitSourceMapOfPosition);
         var emitNodeWithComments = comments.emitNodeWithComments, emitBodyWithDetachedComments = comments.emitBodyWithDetachedComments, emitTrailingCommentsOfPosition = comments.emitTrailingCommentsOfPosition, emitLeadingCommentsOfPosition = comments.emitLeadingCommentsOfPosition;
         var currentSourceFile;
-        var nodeIdToGeneratedName;
-        var autoGeneratedIdToGeneratedName;
-        var generatedNames;
-        var tempFlagsStack;
-        var tempFlags;
-        var reservedNamesStack;
-        var reservedNames;
+        var nodeIdToGeneratedName; // Map of generated names for specific nodes.
+        var autoGeneratedIdToGeneratedName; // Map of generated names for temp and loop variables.
+        var generatedNames; // Set of names generated by the NameGenerator.
+        var tempFlagsStack; // Stack of enclosing name generation scopes.
+        var tempFlags; // TempFlags for the current name generation scope.
+        var reservedNamesStack; // Stack of TempFlags reserved in enclosing name generation scopes.
+        var reservedNames; // TempFlags to reserve in nested name generation scopes.
         var writer;
         var ownWriter;
         var write = writeBase;
@@ -60054,10 +77286,12 @@ var ts;
         var isOwnFileEmit;
         reset();
         return {
+            // public API
             printNode: printNode,
             printList: printList,
             printFile: printFile,
             printBundle: printBundle,
+            // internal API
             writeNode: writeNode,
             writeList: writeList,
             writeFile: writeFile,
@@ -60065,20 +77299,20 @@ var ts;
         };
         function printNode(hint, node, sourceFile) {
             switch (hint) {
-                case 0:
+                case 0 /* SourceFile */:
                     ts.Debug.assert(ts.isSourceFile(node), "Expected a SourceFile node.");
                     break;
-                case 2:
+                case 2 /* IdentifierName */:
                     ts.Debug.assert(ts.isIdentifier(node), "Expected an Identifier node.");
                     break;
-                case 1:
+                case 1 /* Expression */:
                     ts.Debug.assert(ts.isExpression(node), "Expected an Expression node.");
                     break;
             }
             switch (node.kind) {
-                case 274: return printFile(node);
-                case 275: return printBundle(node);
-                case 276: return printUnparsedSource(node);
+                case 274 /* SourceFile */: return printFile(node);
+                case 275 /* Bundle */: return printBundle(node);
+                case 276 /* UnparsedSource */: return printUnparsedSource(node);
             }
             writeNode(hint, node, sourceFile, beginPrint());
             return endPrint();
@@ -60126,7 +77360,7 @@ var ts;
             emitSyntheticTripleSlashReferencesIfNeeded(bundle);
             for (var _a = 0, _b = bundle.prepends; _a < _b.length; _a++) {
                 var prepend = _b[_a];
-                print(4, prepend, undefined);
+                print(4 /* Unspecified */, prepend, /*sourceFile*/ undefined);
                 writeLine();
             }
             if (bundleInfo) {
@@ -60134,7 +77368,7 @@ var ts;
             }
             for (var _c = 0, _d = bundle.sourceFiles; _c < _d.length; _c++) {
                 var sourceFile = _d[_c];
-                print(0, sourceFile, sourceFile);
+                print(0 /* SourceFile */, sourceFile, sourceFile);
             }
             reset();
             writer = previousWriter;
@@ -60142,7 +77376,7 @@ var ts;
         function writeUnparsedSource(unparsed, output) {
             var previousWriter = writer;
             setWriter(output);
-            print(4, unparsed, undefined);
+            print(4 /* Unspecified */, unparsed, /*sourceFile*/ undefined);
             reset();
             writer = previousWriter;
         }
@@ -60152,7 +77386,7 @@ var ts;
             setWriter(output);
             emitShebangIfNeeded(sourceFile);
             emitPrologueDirectivesIfNeeded(sourceFile);
-            print(0, sourceFile, sourceFile);
+            print(0 /* SourceFile */, sourceFile, sourceFile);
             reset();
             writer = previousWriter;
         }
@@ -60168,7 +77402,7 @@ var ts;
             if (sourceFile) {
                 setSourceFile(sourceFile);
             }
-            var pipelinePhase = getPipelinePhase(0, hint);
+            var pipelinePhase = getPipelinePhase(0 /* Notification */, hint);
             pipelinePhase(hint, node);
         }
         function setSourceFile(sourceFile) {
@@ -60179,7 +77413,7 @@ var ts;
             }
         }
         function setWriter(output) {
-            writer = output;
+            writer = output; // TODO: GH#18217
             comments.setWriter(output);
         }
         function reset() {
@@ -60187,45 +77421,47 @@ var ts;
             autoGeneratedIdToGeneratedName = [];
             generatedNames = ts.createMap();
             tempFlagsStack = [];
-            tempFlags = 0;
+            tempFlags = 0 /* Auto */;
             reservedNamesStack = [];
             comments.reset();
-            setWriter(undefined);
+            setWriter(/*output*/ undefined);
         }
         function emit(node) {
             if (!node)
                 return;
-            var pipelinePhase = getPipelinePhase(0, 4);
-            pipelinePhase(4, node);
+            var pipelinePhase = getPipelinePhase(0 /* Notification */, 4 /* Unspecified */);
+            pipelinePhase(4 /* Unspecified */, node);
         }
         function emitIdentifierName(node) {
             if (!node)
                 return;
-            var pipelinePhase = getPipelinePhase(0, 2);
-            pipelinePhase(2, node);
+            var pipelinePhase = getPipelinePhase(0 /* Notification */, 2 /* IdentifierName */);
+            pipelinePhase(2 /* IdentifierName */, node);
         }
         function emitExpression(node) {
             if (!node)
                 return;
-            var pipelinePhase = getPipelinePhase(0, 1);
-            pipelinePhase(1, node);
+            var pipelinePhase = getPipelinePhase(0 /* Notification */, 1 /* Expression */);
+            pipelinePhase(1 /* Expression */, node);
         }
         function getPipelinePhase(phase, hint) {
             switch (phase) {
-                case 0:
+                case 0 /* Notification */:
                     if (onEmitNode) {
                         return pipelineEmitWithNotification;
                     }
-                case 1:
-                    if (emitNodeWithComments && hint !== 0) {
+                // falls through
+                case 1 /* Comments */:
+                    if (emitNodeWithComments && hint !== 0 /* SourceFile */) {
                         return pipelineEmitWithComments;
                     }
                     return pipelineEmitWithoutComments;
-                case 2:
-                    if (onEmitSourceMapOfNode && hint !== 0 && hint !== 2) {
+                case 2 /* SourceMaps */:
+                    if (onEmitSourceMapOfNode && hint !== 0 /* SourceFile */ && hint !== 2 /* IdentifierName */) {
                         return pipelineEmitWithSourceMap;
                     }
-                case 3:
+                // falls through
+                case 3 /* Emit */:
                     return pipelineEmitWithHint;
                 default:
                     return ts.Debug.assertNever(phase, "Unexpected value for PipelinePhase: " + phase);
@@ -60235,341 +77471,365 @@ var ts;
             return getPipelinePhase(currentPhase + 1, hint);
         }
         function pipelineEmitWithNotification(hint, node) {
-            ts.Debug.assertDefined(onEmitNode)(hint, node, getNextPipelinePhase(0, hint));
+            ts.Debug.assertDefined(onEmitNode)(hint, node, getNextPipelinePhase(0 /* Notification */, hint));
         }
         function pipelineEmitWithComments(hint, node) {
             ts.Debug.assertDefined(emitNodeWithComments);
-            ts.Debug.assert(hint !== 0);
-            emitNodeWithComments(hint, trySubstituteNode(hint, node), getNextPipelinePhase(1, hint));
+            ts.Debug.assert(hint !== 0 /* SourceFile */);
+            emitNodeWithComments(hint, trySubstituteNode(hint, node), getNextPipelinePhase(1 /* Comments */, hint));
         }
         function pipelineEmitWithoutComments(hint, node) {
-            var pipelinePhase = getNextPipelinePhase(1, hint);
+            var pipelinePhase = getNextPipelinePhase(1 /* Comments */, hint);
             pipelinePhase(hint, trySubstituteNode(hint, node));
         }
         function pipelineEmitWithSourceMap(hint, node) {
-            ts.Debug.assert(hint !== 0 && hint !== 2);
+            ts.Debug.assert(hint !== 0 /* SourceFile */ && hint !== 2 /* IdentifierName */);
             ts.Debug.assertDefined(onEmitSourceMapOfNode)(hint, node, pipelineEmitWithHint);
         }
         function pipelineEmitWithHint(hint, node) {
-            if (hint === 0)
+            if (hint === 0 /* SourceFile */)
                 return emitSourceFile(ts.cast(node, ts.isSourceFile));
-            if (hint === 2)
+            if (hint === 2 /* IdentifierName */)
                 return emitIdentifier(ts.cast(node, ts.isIdentifier));
-            if (hint === 3)
+            if (hint === 3 /* MappedTypeParameter */)
                 return emitMappedTypeParameter(ts.cast(node, ts.isTypeParameterDeclaration));
-            if (hint === 4) {
+            if (hint === 4 /* Unspecified */) {
                 if (ts.isKeyword(node.kind))
                     return writeTokenNode(node, writeKeyword);
                 switch (node.kind) {
-                    case 14:
-                    case 15:
-                    case 16:
+                    // Pseudo-literals
+                    case 14 /* TemplateHead */:
+                    case 15 /* TemplateMiddle */:
+                    case 16 /* TemplateTail */:
                         return emitLiteral(node);
-                    case 276:
+                    case 276 /* UnparsedSource */:
                         return emitUnparsedSource(node);
-                    case 71:
+                    // Identifiers
+                    case 71 /* Identifier */:
                         return emitIdentifier(node);
-                    case 146:
+                    // Parse tree nodes
+                    // Names
+                    case 146 /* QualifiedName */:
                         return emitQualifiedName(node);
-                    case 147:
+                    case 147 /* ComputedPropertyName */:
                         return emitComputedPropertyName(node);
-                    case 148:
+                    // Signature elements
+                    case 148 /* TypeParameter */:
                         return emitTypeParameter(node);
-                    case 149:
+                    case 149 /* Parameter */:
                         return emitParameter(node);
-                    case 150:
+                    case 150 /* Decorator */:
                         return emitDecorator(node);
-                    case 151:
+                    // Type members
+                    case 151 /* PropertySignature */:
                         return emitPropertySignature(node);
-                    case 152:
+                    case 152 /* PropertyDeclaration */:
                         return emitPropertyDeclaration(node);
-                    case 153:
+                    case 153 /* MethodSignature */:
                         return emitMethodSignature(node);
-                    case 154:
+                    case 154 /* MethodDeclaration */:
                         return emitMethodDeclaration(node);
-                    case 155:
+                    case 155 /* Constructor */:
                         return emitConstructor(node);
-                    case 156:
-                    case 157:
+                    case 156 /* GetAccessor */:
+                    case 157 /* SetAccessor */:
                         return emitAccessorDeclaration(node);
-                    case 158:
+                    case 158 /* CallSignature */:
                         return emitCallSignature(node);
-                    case 159:
+                    case 159 /* ConstructSignature */:
                         return emitConstructSignature(node);
-                    case 160:
+                    case 160 /* IndexSignature */:
                         return emitIndexSignature(node);
-                    case 161:
+                    // Types
+                    case 161 /* TypePredicate */:
                         return emitTypePredicate(node);
-                    case 162:
+                    case 162 /* TypeReference */:
                         return emitTypeReference(node);
-                    case 163:
+                    case 163 /* FunctionType */:
                         return emitFunctionType(node);
-                    case 284:
+                    case 284 /* JSDocFunctionType */:
                         return emitJSDocFunctionType(node);
-                    case 164:
+                    case 164 /* ConstructorType */:
                         return emitConstructorType(node);
-                    case 165:
+                    case 165 /* TypeQuery */:
                         return emitTypeQuery(node);
-                    case 166:
+                    case 166 /* TypeLiteral */:
                         return emitTypeLiteral(node);
-                    case 167:
+                    case 167 /* ArrayType */:
                         return emitArrayType(node);
-                    case 168:
+                    case 168 /* TupleType */:
                         return emitTupleType(node);
-                    case 169:
+                    case 169 /* UnionType */:
                         return emitUnionType(node);
-                    case 170:
+                    case 170 /* IntersectionType */:
                         return emitIntersectionType(node);
-                    case 171:
+                    case 171 /* ConditionalType */:
                         return emitConditionalType(node);
-                    case 172:
+                    case 172 /* InferType */:
                         return emitInferType(node);
-                    case 173:
+                    case 173 /* ParenthesizedType */:
                         return emitParenthesizedType(node);
-                    case 207:
+                    case 207 /* ExpressionWithTypeArguments */:
                         return emitExpressionWithTypeArguments(node);
-                    case 174:
+                    case 174 /* ThisType */:
                         return emitThisType();
-                    case 175:
+                    case 175 /* TypeOperator */:
                         return emitTypeOperator(node);
-                    case 176:
+                    case 176 /* IndexedAccessType */:
                         return emitIndexedAccessType(node);
-                    case 177:
+                    case 177 /* MappedType */:
                         return emitMappedType(node);
-                    case 178:
+                    case 178 /* LiteralType */:
                         return emitLiteralType(node);
-                    case 179:
+                    case 179 /* ImportType */:
                         return emitImportTypeNode(node);
-                    case 279:
+                    case 279 /* JSDocAllType */:
                         write("*");
                         return;
-                    case 280:
+                    case 280 /* JSDocUnknownType */:
                         write("?");
                         return;
-                    case 281:
+                    case 281 /* JSDocNullableType */:
                         return emitJSDocNullableType(node);
-                    case 282:
+                    case 282 /* JSDocNonNullableType */:
                         return emitJSDocNonNullableType(node);
-                    case 283:
+                    case 283 /* JSDocOptionalType */:
                         return emitJSDocOptionalType(node);
-                    case 285:
+                    case 285 /* JSDocVariadicType */:
                         return emitJSDocVariadicType(node);
-                    case 180:
+                    // Binding patterns
+                    case 180 /* ObjectBindingPattern */:
                         return emitObjectBindingPattern(node);
-                    case 181:
+                    case 181 /* ArrayBindingPattern */:
                         return emitArrayBindingPattern(node);
-                    case 182:
+                    case 182 /* BindingElement */:
                         return emitBindingElement(node);
-                    case 211:
+                    // Misc
+                    case 211 /* TemplateSpan */:
                         return emitTemplateSpan(node);
-                    case 212:
+                    case 212 /* SemicolonClassElement */:
                         return emitSemicolonClassElement();
-                    case 213:
+                    // Statements
+                    case 213 /* Block */:
                         return emitBlock(node);
-                    case 214:
+                    case 214 /* VariableStatement */:
                         return emitVariableStatement(node);
-                    case 215:
+                    case 215 /* EmptyStatement */:
                         return emitEmptyStatement();
-                    case 216:
+                    case 216 /* ExpressionStatement */:
                         return emitExpressionStatement(node);
-                    case 217:
+                    case 217 /* IfStatement */:
                         return emitIfStatement(node);
-                    case 218:
+                    case 218 /* DoStatement */:
                         return emitDoStatement(node);
-                    case 219:
+                    case 219 /* WhileStatement */:
                         return emitWhileStatement(node);
-                    case 220:
+                    case 220 /* ForStatement */:
                         return emitForStatement(node);
-                    case 221:
+                    case 221 /* ForInStatement */:
                         return emitForInStatement(node);
-                    case 222:
+                    case 222 /* ForOfStatement */:
                         return emitForOfStatement(node);
-                    case 223:
+                    case 223 /* ContinueStatement */:
                         return emitContinueStatement(node);
-                    case 224:
+                    case 224 /* BreakStatement */:
                         return emitBreakStatement(node);
-                    case 225:
+                    case 225 /* ReturnStatement */:
                         return emitReturnStatement(node);
-                    case 226:
+                    case 226 /* WithStatement */:
                         return emitWithStatement(node);
-                    case 227:
+                    case 227 /* SwitchStatement */:
                         return emitSwitchStatement(node);
-                    case 228:
+                    case 228 /* LabeledStatement */:
                         return emitLabeledStatement(node);
-                    case 229:
+                    case 229 /* ThrowStatement */:
                         return emitThrowStatement(node);
-                    case 230:
+                    case 230 /* TryStatement */:
                         return emitTryStatement(node);
-                    case 231:
+                    case 231 /* DebuggerStatement */:
                         return emitDebuggerStatement(node);
-                    case 232:
+                    // Declarations
+                    case 232 /* VariableDeclaration */:
                         return emitVariableDeclaration(node);
-                    case 233:
+                    case 233 /* VariableDeclarationList */:
                         return emitVariableDeclarationList(node);
-                    case 234:
+                    case 234 /* FunctionDeclaration */:
                         return emitFunctionDeclaration(node);
-                    case 235:
+                    case 235 /* ClassDeclaration */:
                         return emitClassDeclaration(node);
-                    case 236:
+                    case 236 /* InterfaceDeclaration */:
                         return emitInterfaceDeclaration(node);
-                    case 237:
+                    case 237 /* TypeAliasDeclaration */:
                         return emitTypeAliasDeclaration(node);
-                    case 238:
+                    case 238 /* EnumDeclaration */:
                         return emitEnumDeclaration(node);
-                    case 239:
+                    case 239 /* ModuleDeclaration */:
                         return emitModuleDeclaration(node);
-                    case 240:
+                    case 240 /* ModuleBlock */:
                         return emitModuleBlock(node);
-                    case 241:
+                    case 241 /* CaseBlock */:
                         return emitCaseBlock(node);
-                    case 242:
+                    case 242 /* NamespaceExportDeclaration */:
                         return emitNamespaceExportDeclaration(node);
-                    case 243:
+                    case 243 /* ImportEqualsDeclaration */:
                         return emitImportEqualsDeclaration(node);
-                    case 244:
+                    case 244 /* ImportDeclaration */:
                         return emitImportDeclaration(node);
-                    case 245:
+                    case 245 /* ImportClause */:
                         return emitImportClause(node);
-                    case 246:
+                    case 246 /* NamespaceImport */:
                         return emitNamespaceImport(node);
-                    case 247:
+                    case 247 /* NamedImports */:
                         return emitNamedImports(node);
-                    case 248:
+                    case 248 /* ImportSpecifier */:
                         return emitImportSpecifier(node);
-                    case 249:
+                    case 249 /* ExportAssignment */:
                         return emitExportAssignment(node);
-                    case 250:
+                    case 250 /* ExportDeclaration */:
                         return emitExportDeclaration(node);
-                    case 251:
+                    case 251 /* NamedExports */:
                         return emitNamedExports(node);
-                    case 252:
+                    case 252 /* ExportSpecifier */:
                         return emitExportSpecifier(node);
-                    case 253:
+                    case 253 /* MissingDeclaration */:
                         return;
-                    case 254:
+                    // Module references
+                    case 254 /* ExternalModuleReference */:
                         return emitExternalModuleReference(node);
-                    case 10:
+                    // JSX (non-expression)
+                    case 10 /* JsxText */:
                         return emitJsxText(node);
-                    case 257:
-                    case 260:
+                    case 257 /* JsxOpeningElement */:
+                    case 260 /* JsxOpeningFragment */:
                         return emitJsxOpeningElementOrFragment(node);
-                    case 258:
-                    case 261:
+                    case 258 /* JsxClosingElement */:
+                    case 261 /* JsxClosingFragment */:
                         return emitJsxClosingElementOrFragment(node);
-                    case 262:
+                    case 262 /* JsxAttribute */:
                         return emitJsxAttribute(node);
-                    case 263:
+                    case 263 /* JsxAttributes */:
                         return emitJsxAttributes(node);
-                    case 264:
+                    case 264 /* JsxSpreadAttribute */:
                         return emitJsxSpreadAttribute(node);
-                    case 265:
+                    case 265 /* JsxExpression */:
                         return emitJsxExpression(node);
-                    case 266:
+                    // Clauses
+                    case 266 /* CaseClause */:
                         return emitCaseClause(node);
-                    case 267:
+                    case 267 /* DefaultClause */:
                         return emitDefaultClause(node);
-                    case 268:
+                    case 268 /* HeritageClause */:
                         return emitHeritageClause(node);
-                    case 269:
+                    case 269 /* CatchClause */:
                         return emitCatchClause(node);
-                    case 270:
+                    // Property assignments
+                    case 270 /* PropertyAssignment */:
                         return emitPropertyAssignment(node);
-                    case 271:
+                    case 271 /* ShorthandPropertyAssignment */:
                         return emitShorthandPropertyAssignment(node);
-                    case 272:
+                    case 272 /* SpreadAssignment */:
                         return emitSpreadAssignment(node);
-                    case 273:
+                    // Enum
+                    case 273 /* EnumMember */:
                         return emitEnumMember(node);
+                    // JSDoc nodes (ignored)
+                    // Transformation nodes (ignored)
                 }
                 if (ts.isExpression(node)) {
-                    hint = 1;
-                    node = trySubstituteNode(1, node);
+                    hint = 1 /* Expression */;
+                    node = trySubstituteNode(1 /* Expression */, node);
                 }
                 else if (ts.isToken(node)) {
                     return writeTokenNode(node, writePunctuation);
                 }
             }
-            if (hint === 1) {
+            if (hint === 1 /* Expression */) {
                 switch (node.kind) {
-                    case 8:
+                    // Literals
+                    case 8 /* NumericLiteral */:
                         return emitNumericLiteral(node);
-                    case 9:
-                    case 12:
-                    case 13:
+                    case 9 /* StringLiteral */:
+                    case 12 /* RegularExpressionLiteral */:
+                    case 13 /* NoSubstitutionTemplateLiteral */:
                         return emitLiteral(node);
-                    case 71:
+                    // Identifiers
+                    case 71 /* Identifier */:
                         return emitIdentifier(node);
-                    case 86:
-                    case 95:
-                    case 97:
-                    case 101:
-                    case 99:
-                    case 91:
+                    // Reserved words
+                    case 86 /* FalseKeyword */:
+                    case 95 /* NullKeyword */:
+                    case 97 /* SuperKeyword */:
+                    case 101 /* TrueKeyword */:
+                    case 99 /* ThisKeyword */:
+                    case 91 /* ImportKeyword */:
                         writeTokenNode(node, writeKeyword);
                         return;
-                    case 183:
+                    // Expressions
+                    case 183 /* ArrayLiteralExpression */:
                         return emitArrayLiteralExpression(node);
-                    case 184:
+                    case 184 /* ObjectLiteralExpression */:
                         return emitObjectLiteralExpression(node);
-                    case 185:
+                    case 185 /* PropertyAccessExpression */:
                         return emitPropertyAccessExpression(node);
-                    case 186:
+                    case 186 /* ElementAccessExpression */:
                         return emitElementAccessExpression(node);
-                    case 187:
+                    case 187 /* CallExpression */:
                         return emitCallExpression(node);
-                    case 188:
+                    case 188 /* NewExpression */:
                         return emitNewExpression(node);
-                    case 189:
+                    case 189 /* TaggedTemplateExpression */:
                         return emitTaggedTemplateExpression(node);
-                    case 190:
+                    case 190 /* TypeAssertionExpression */:
                         return emitTypeAssertionExpression(node);
-                    case 191:
+                    case 191 /* ParenthesizedExpression */:
                         return emitParenthesizedExpression(node);
-                    case 192:
+                    case 192 /* FunctionExpression */:
                         return emitFunctionExpression(node);
-                    case 193:
+                    case 193 /* ArrowFunction */:
                         return emitArrowFunction(node);
-                    case 194:
+                    case 194 /* DeleteExpression */:
                         return emitDeleteExpression(node);
-                    case 195:
+                    case 195 /* TypeOfExpression */:
                         return emitTypeOfExpression(node);
-                    case 196:
+                    case 196 /* VoidExpression */:
                         return emitVoidExpression(node);
-                    case 197:
+                    case 197 /* AwaitExpression */:
                         return emitAwaitExpression(node);
-                    case 198:
+                    case 198 /* PrefixUnaryExpression */:
                         return emitPrefixUnaryExpression(node);
-                    case 199:
+                    case 199 /* PostfixUnaryExpression */:
                         return emitPostfixUnaryExpression(node);
-                    case 200:
+                    case 200 /* BinaryExpression */:
                         return emitBinaryExpression(node);
-                    case 201:
+                    case 201 /* ConditionalExpression */:
                         return emitConditionalExpression(node);
-                    case 202:
+                    case 202 /* TemplateExpression */:
                         return emitTemplateExpression(node);
-                    case 203:
+                    case 203 /* YieldExpression */:
                         return emitYieldExpression(node);
-                    case 204:
+                    case 204 /* SpreadElement */:
                         return emitSpreadExpression(node);
-                    case 205:
+                    case 205 /* ClassExpression */:
                         return emitClassExpression(node);
-                    case 206:
+                    case 206 /* OmittedExpression */:
                         return;
-                    case 208:
+                    case 208 /* AsExpression */:
                         return emitAsExpression(node);
-                    case 209:
+                    case 209 /* NonNullExpression */:
                         return emitNonNullExpression(node);
-                    case 210:
+                    case 210 /* MetaProperty */:
                         return emitMetaProperty(node);
-                    case 255:
+                    // JSX
+                    case 255 /* JsxElement */:
                         return emitJsxElement(node);
-                    case 256:
+                    case 256 /* JsxSelfClosingElement */:
                         return emitJsxSelfClosingElement(node);
-                    case 259:
+                    case 259 /* JsxFragment */:
                         return emitJsxFragment(node);
-                    case 301:
+                    // Transformation nodes
+                    case 301 /* PartiallyEmittedExpression */:
                         return emitPartiallyEmittedExpression(node);
-                    case 302:
+                    case 302 /* CommaListExpression */:
                         return emitCommaList(node);
                 }
             }
@@ -60586,7 +77846,7 @@ var ts;
         }
         function emitHelpers(node) {
             var helpersEmitted = false;
-            var bundle = node.kind === 275 ? node : undefined;
+            var bundle = node.kind === 275 /* Bundle */ ? node : undefined;
             if (bundle && moduleKind === ts.ModuleKind.None) {
                 return;
             }
@@ -60601,8 +77861,13 @@ var ts;
                     for (var _a = 0, _b = ts.stableSort(helpers, ts.compareEmitHelpers); _a < _b.length; _a++) {
                         var helper = _b[_a];
                         if (!helper.scoped) {
+                            // Skip the helper if it can be skipped and the noEmitHelpers compiler
+                            // option is set, or if it can be imported and the importHelpers compiler
+                            // option is set.
                             if (shouldSkip)
                                 continue;
+                            // Skip the helper if it can be bundled but hasn't already been emitted and we
+                            // are emitting a bundled module.
                             if (shouldBundle) {
                                 if (bundledHelpers.get(helper.name)) {
                                     continue;
@@ -60611,6 +77876,7 @@ var ts;
                             }
                         }
                         else if (bundle) {
+                            // Skip the helper if it is scoped and we are emitting bundled helpers
                             continue;
                         }
                         if (typeof helper.text === "string") {
@@ -60625,34 +77891,52 @@ var ts;
             }
             return helpersEmitted;
         }
+        //
+        // Literals/Pseudo-literals
+        //
+        // SyntaxKind.NumericLiteral
         function emitNumericLiteral(node) {
             emitLiteral(node);
         }
+        // SyntaxKind.StringLiteral
+        // SyntaxKind.RegularExpressionLiteral
+        // SyntaxKind.NoSubstitutionTemplateLiteral
+        // SyntaxKind.TemplateHead
+        // SyntaxKind.TemplateMiddle
+        // SyntaxKind.TemplateTail
         function emitLiteral(node) {
             var text = getLiteralTextOfNode(node);
             if ((printerOptions.sourceMap || printerOptions.inlineSourceMap)
-                && (node.kind === 9 || ts.isTemplateLiteralKind(node.kind))) {
+                && (node.kind === 9 /* StringLiteral */ || ts.isTemplateLiteralKind(node.kind))) {
                 writeLiteral(text);
             }
             else {
+                // Quick info expects all literals to be called with writeStringLiteral, as there's no specific type for numberLiterals
                 writeStringLiteral(text);
             }
         }
+        // SyntaxKind.UnparsedSource
         function emitUnparsedSource(unparsed) {
-            write(unparsed.text);
+            writer.rawWrite(unparsed.text);
         }
+        //
+        // Identifiers
+        //
         function emitIdentifier(node) {
             var writeText = node.symbol ? writeSymbol : write;
-            writeText(getTextOfNode(node, false), node.symbol);
-            emitList(node, node.typeArguments, 26896);
+            writeText(getTextOfNode(node, /*includeTrivia*/ false), node.symbol);
+            emitList(node, node.typeArguments, 26896 /* TypeParameters */); // Call emitList directly since it could be an array of TypeParameterDeclarations _or_ type arguments
         }
+        //
+        // Names
+        //
         function emitQualifiedName(node) {
             emitEntityName(node.left);
             writePunctuation(".");
             emit(node.right);
         }
         function emitEntityName(node) {
-            if (node.kind === 71) {
+            if (node.kind === 71 /* Identifier */) {
                 emitExpression(node);
             }
             else {
@@ -60664,6 +77948,9 @@ var ts;
             emitExpression(node.expression);
             writePunctuation("]");
         }
+        //
+        // Signature elements
+        //
         function emitTypeParameter(node) {
             emit(node.name);
             if (node.constraint) {
@@ -60685,18 +77972,22 @@ var ts;
             emit(node.dotDotDotToken);
             emitNodeWithWriter(node.name, writeParameter);
             emit(node.questionToken);
-            if (node.parent && node.parent.kind === 284 && !node.name) {
+            if (node.parent && node.parent.kind === 284 /* JSDocFunctionType */ && !node.name) {
                 emit(node.type);
             }
             else {
                 emitTypeAnnotation(node.type);
             }
+            // The comment position has to fallback to any present node within the parameterdeclaration because as it turns out, the parser can make parameter declarations with _just_ an initializer.
             emitInitializer(node.initializer, node.type ? node.type.end : node.questionToken ? node.questionToken.end : node.name ? node.name.end : node.modifiers ? node.modifiers.end : node.decorators ? node.decorators.end : node.pos, node);
         }
         function emitDecorator(decorator) {
             writePunctuation("@");
             emitExpression(decorator.expression);
         }
+        //
+        // Type members
+        //
         function emitPropertySignature(node) {
             emitDecorators(node, node.decorators);
             emitModifiers(node, node.modifiers);
@@ -60743,7 +78034,7 @@ var ts;
         function emitAccessorDeclaration(node) {
             emitDecorators(node, node.decorators);
             emitModifiers(node, node.modifiers);
-            writeKeyword(node.kind === 156 ? "get" : "set");
+            writeKeyword(node.kind === 156 /* GetAccessor */ ? "get" : "set");
             writeSpace();
             emit(node.name);
             emitSignatureAndBody(node, emitSignatureHead);
@@ -60780,6 +78071,9 @@ var ts;
         function emitSemicolonClassElement() {
             writeSemicolon();
         }
+        //
+        // Types
+        //
         function emitTypePredicate(node) {
             emit(node.parameterName);
             writeSpace();
@@ -60838,8 +78132,8 @@ var ts;
         }
         function emitTypeLiteral(node) {
             writePunctuation("{");
-            var flags = ts.getEmitFlags(node) & 1 ? 384 : 16449;
-            emitList(node, node.members, flags | 262144);
+            var flags = ts.getEmitFlags(node) & 1 /* SingleLine */ ? 384 /* SingleLineTypeLiteralMembers */ : 16449 /* MultiLineTypeLiteralMembers */;
+            emitList(node, node.members, flags | 262144 /* NoSpaceIfEmpty */);
             writePunctuation("}");
         }
         function emitArrayType(node) {
@@ -60853,14 +78147,14 @@ var ts;
         }
         function emitTupleType(node) {
             writePunctuation("[");
-            emitList(node, node.elementTypes, 272);
+            emitList(node, node.elementTypes, 272 /* TupleTypeElements */);
             writePunctuation("]");
         }
         function emitUnionType(node) {
-            emitList(node, node.types, 260);
+            emitList(node, node.types, 260 /* UnionTypeConstituents */);
         }
         function emitIntersectionType(node) {
-            emitList(node, node.types, 264);
+            emitList(node, node.types, 264 /* IntersectionTypeConstituents */);
         }
         function emitConditionalType(node) {
             emit(node.checkType);
@@ -60904,7 +78198,7 @@ var ts;
         function emitMappedType(node) {
             var emitFlags = ts.getEmitFlags(node);
             writePunctuation("{");
-            if (emitFlags & 1) {
+            if (emitFlags & 1 /* SingleLine */) {
                 writeSpace();
             }
             else {
@@ -60913,18 +78207,18 @@ var ts;
             }
             if (node.readonlyToken) {
                 emit(node.readonlyToken);
-                if (node.readonlyToken.kind !== 132) {
+                if (node.readonlyToken.kind !== 132 /* ReadonlyKeyword */) {
                     writeKeyword("readonly");
                 }
                 writeSpace();
             }
             writePunctuation("[");
-            var pipelinePhase = getPipelinePhase(0, 3);
-            pipelinePhase(3, node.typeParameter);
+            var pipelinePhase = getPipelinePhase(0 /* Notification */, 3 /* MappedTypeParameter */);
+            pipelinePhase(3 /* MappedTypeParameter */, node.typeParameter);
             writePunctuation("]");
             if (node.questionToken) {
                 emit(node.questionToken);
-                if (node.questionToken.kind !== 55) {
+                if (node.questionToken.kind !== 55 /* QuestionToken */) {
                     writePunctuation("?");
                 }
             }
@@ -60932,7 +78226,7 @@ var ts;
             writeSpace();
             emit(node.type);
             writeSemicolon();
-            if (emitFlags & 1) {
+            if (emitFlags & 1 /* SingleLine */) {
                 writeSpace();
             }
             else {
@@ -60959,14 +78253,17 @@ var ts;
             }
             emitTypeArguments(node, node.typeArguments);
         }
+        //
+        // Binding patterns
+        //
         function emitObjectBindingPattern(node) {
             writePunctuation("{");
-            emitList(node, node.elements, 262576);
+            emitList(node, node.elements, 262576 /* ObjectBindingPatternElements */);
             writePunctuation("}");
         }
         function emitArrayBindingPattern(node) {
             writePunctuation("[");
-            emitList(node, node.elements, 262448);
+            emitList(node, node.elements, 262448 /* ArrayBindingPatternElements */);
             writePunctuation("]");
         }
         function emitBindingElement(node) {
@@ -60979,20 +78276,23 @@ var ts;
             emit(node.name);
             emitInitializer(node.initializer, node.name.end, node);
         }
+        //
+        // Expressions
+        //
         function emitArrayLiteralExpression(node) {
             var elements = node.elements;
-            var preferNewLine = node.multiLine ? 32768 : 0;
-            emitExpressionList(node, elements, 4466 | preferNewLine);
+            var preferNewLine = node.multiLine ? 32768 /* PreferNewLine */ : 0 /* None */;
+            emitExpressionList(node, elements, 4466 /* ArrayLiteralExpressionElements */ | preferNewLine);
         }
         function emitObjectLiteralExpression(node) {
             ts.forEach(node.properties, generateMemberNames);
-            var indentedFlag = ts.getEmitFlags(node) & 65536;
+            var indentedFlag = ts.getEmitFlags(node) & 65536 /* Indented */;
             if (indentedFlag) {
                 increaseIndent();
             }
-            var preferNewLine = node.multiLine ? 32768 : 0;
-            var allowTrailingComma = currentSourceFile.languageVersion >= 1 && !ts.isJsonSourceFile(currentSourceFile) ? 32 : 0;
-            emitList(node, node.properties, 263122 | allowTrailingComma | preferNewLine);
+            var preferNewLine = node.multiLine ? 32768 /* PreferNewLine */ : 0 /* None */;
+            var allowTrailingComma = currentSourceFile.languageVersion >= 1 /* ES5 */ && !ts.isJsonSourceFile(currentSourceFile) ? 32 /* AllowTrailingComma */ : 0 /* None */;
+            emitList(node, node.properties, 263122 /* ObjectLiteralExpressionProperties */ | allowTrailingComma | preferNewLine);
             if (indentedFlag) {
                 decreaseIndent();
             }
@@ -61000,10 +78300,10 @@ var ts;
         function emitPropertyAccessExpression(node) {
             var indentBeforeDot = false;
             var indentAfterDot = false;
-            if (!(ts.getEmitFlags(node) & 131072)) {
+            if (!(ts.getEmitFlags(node) & 131072 /* NoIndentation */)) {
                 var dotRangeStart = node.expression.end;
                 var dotRangeEnd = ts.skipTrivia(currentSourceFile.text, node.expression.end) + 1;
-                var dotToken = ts.createToken(23);
+                var dotToken = ts.createToken(23 /* DotToken */);
                 dotToken.pos = dotRangeStart;
                 dotToken.end = dotRangeEnd;
                 indentBeforeDot = needsIndentation(node, node.expression, dotToken);
@@ -61015,20 +78315,25 @@ var ts;
             if (shouldEmitDotDot) {
                 writePunctuation(".");
             }
-            emitTokenWithComment(23, node.expression.end, writePunctuation, node);
+            emitTokenWithComment(23 /* DotToken */, node.expression.end, writePunctuation, node);
             increaseIndentIf(indentAfterDot);
             emit(node.name);
             decreaseIndentIf(indentBeforeDot, indentAfterDot);
         }
+        // 1..toString is a valid property access, emit a dot after the literal
+        // Also emit a dot if expression is a integer const enum value - it will appear in generated code as numeric literal
         function needsDotDotForPropertyAccess(expression) {
             expression = ts.skipPartiallyEmittedExpressions(expression);
             if (ts.isNumericLiteral(expression)) {
+                // check if numeric literal is a decimal literal that was originally written with a dot
                 var text = getLiteralTextOfNode(expression);
                 return !expression.numericLiteralFlags
-                    && !ts.stringContains(text, ts.tokenToString(23));
+                    && !ts.stringContains(text, ts.tokenToString(23 /* DotToken */));
             }
             else if (ts.isPropertyAccessExpression(expression) || ts.isElementAccessExpression(expression)) {
+                // check if constant enum value is integer
                 var constantValue = ts.getConstantValue(expression);
+                // isFinite handles cases when constantValue is undefined
                 return typeof constantValue === "number" && isFinite(constantValue)
                     && Math.floor(constantValue) === constantValue
                     && printerOptions.removeComments;
@@ -61036,21 +78341,21 @@ var ts;
         }
         function emitElementAccessExpression(node) {
             emitExpression(node.expression);
-            emitTokenWithComment(21, node.expression.end, writePunctuation, node);
+            emitTokenWithComment(21 /* OpenBracketToken */, node.expression.end, writePunctuation, node);
             emitExpression(node.argumentExpression);
-            emitTokenWithComment(22, node.argumentExpression.end, writePunctuation, node);
+            emitTokenWithComment(22 /* CloseBracketToken */, node.argumentExpression.end, writePunctuation, node);
         }
         function emitCallExpression(node) {
             emitExpression(node.expression);
             emitTypeArguments(node, node.typeArguments);
-            emitExpressionList(node, node.arguments, 1296);
+            emitExpressionList(node, node.arguments, 1296 /* CallExpressionArguments */);
         }
         function emitNewExpression(node) {
-            emitTokenWithComment(94, node.pos, writeKeyword, node);
+            emitTokenWithComment(94 /* NewKeyword */, node.pos, writeKeyword, node);
             writeSpace();
             emitExpression(node.expression);
             emitTypeArguments(node, node.typeArguments);
-            emitExpressionList(node, node.arguments, 9488);
+            emitExpressionList(node, node.arguments, 9488 /* NewExpressionArguments */);
         }
         function emitTaggedTemplateExpression(node) {
             emitExpression(node.tag);
@@ -61065,9 +78370,9 @@ var ts;
             emitExpression(node.expression);
         }
         function emitParenthesizedExpression(node) {
-            var openParenPos = emitTokenWithComment(19, node.pos, writePunctuation, node);
+            var openParenPos = emitTokenWithComment(19 /* OpenParenToken */, node.pos, writePunctuation, node);
             emitExpression(node.expression);
-            emitTokenWithComment(20, node.expression ? node.expression.end : openParenPos, writePunctuation, node);
+            emitTokenWithComment(20 /* CloseParenToken */, node.expression ? node.expression.end : openParenPos, writePunctuation, node);
         }
         function emitFunctionExpression(node) {
             generateNameIfNeeded(node.name);
@@ -61086,22 +78391,22 @@ var ts;
             emit(node.equalsGreaterThanToken);
         }
         function emitDeleteExpression(node) {
-            emitTokenWithComment(80, node.pos, writeKeyword, node);
+            emitTokenWithComment(80 /* DeleteKeyword */, node.pos, writeKeyword, node);
             writeSpace();
             emitExpression(node.expression);
         }
         function emitTypeOfExpression(node) {
-            emitTokenWithComment(103, node.pos, writeKeyword, node);
+            emitTokenWithComment(103 /* TypeOfKeyword */, node.pos, writeKeyword, node);
             writeSpace();
             emitExpression(node.expression);
         }
         function emitVoidExpression(node) {
-            emitTokenWithComment(105, node.pos, writeKeyword, node);
+            emitTokenWithComment(105 /* VoidKeyword */, node.pos, writeKeyword, node);
             writeSpace();
             emitExpression(node.expression);
         }
         function emitAwaitExpression(node) {
-            emitTokenWithComment(121, node.pos, writeKeyword, node);
+            emitTokenWithComment(121 /* AwaitKeyword */, node.pos, writeKeyword, node);
             writeSpace();
             emitExpression(node.expression);
         }
@@ -61113,24 +78418,36 @@ var ts;
             emitExpression(node.operand);
         }
         function shouldEmitWhitespaceBeforeOperand(node) {
+            // In some cases, we need to emit a space between the operator and the operand. One obvious case
+            // is when the operator is an identifier, like delete or typeof. We also need to do this for plus
+            // and minus expressions in certain cases. Specifically, consider the following two cases (parens
+            // are just for clarity of exposition, and not part of the source code):
+            //
+            //  (+(+1))
+            //  (+(++1))
+            //
+            // We need to emit a space in both cases. In the first case, the absence of a space will make
+            // the resulting expression a prefix increment operation. And in the second, it will make the resulting
+            // expression a prefix increment whose operand is a plus expression - (++(+x))
+            // The same is true of minus of course.
             var operand = node.operand;
-            return operand.kind === 198
-                && ((node.operator === 37 && (operand.operator === 37 || operand.operator === 43))
-                    || (node.operator === 38 && (operand.operator === 38 || operand.operator === 44)));
+            return operand.kind === 198 /* PrefixUnaryExpression */
+                && ((node.operator === 37 /* PlusToken */ && (operand.operator === 37 /* PlusToken */ || operand.operator === 43 /* PlusPlusToken */))
+                    || (node.operator === 38 /* MinusToken */ && (operand.operator === 38 /* MinusToken */ || operand.operator === 44 /* MinusMinusToken */)));
         }
         function emitPostfixUnaryExpression(node) {
             emitExpression(node.operand);
             writeTokenText(node.operator, writeOperator);
         }
         function emitBinaryExpression(node) {
-            var isCommaOperator = node.operatorToken.kind !== 26;
+            var isCommaOperator = node.operatorToken.kind !== 26 /* CommaToken */;
             var indentBeforeOperator = needsIndentation(node, node.left, node.operatorToken);
             var indentAfterOperator = needsIndentation(node, node.operatorToken, node.right);
             emitExpression(node.left);
             increaseIndentIf(indentBeforeOperator, isCommaOperator ? " " : undefined);
             emitLeadingCommentsOfPosition(node.operatorToken.pos);
             writeTokenNode(node.operatorToken, writeOperator);
-            emitTrailingCommentsOfPosition(node.operatorToken.end, true);
+            emitTrailingCommentsOfPosition(node.operatorToken.end, /*prefixSpace*/ true); // Binary operators should have a space before the comment starts
             increaseIndentIf(indentAfterOperator, " ");
             emitExpression(node.right);
             decreaseIndentIf(indentBeforeOperator, indentAfterOperator);
@@ -61154,10 +78471,10 @@ var ts;
         }
         function emitTemplateExpression(node) {
             emit(node.head);
-            emitList(node, node.templateSpans, 131072);
+            emitList(node, node.templateSpans, 131072 /* TemplateExpressionSpans */);
         }
         function emitYieldExpression(node) {
-            emitTokenWithComment(116, node.pos, writeKeyword, node);
+            emitTokenWithComment(116 /* YieldKeyword */, node.pos, writeKeyword, node);
             emit(node.asteriskToken);
             emitExpressionWithLeadingSpace(node.expression);
         }
@@ -61191,18 +78508,24 @@ var ts;
             writePunctuation(".");
             emit(node.name);
         }
+        //
+        // Misc
+        //
         function emitTemplateSpan(node) {
             emitExpression(node.expression);
             emit(node.literal);
         }
+        //
+        // Statements
+        //
         function emitBlock(node) {
-            emitBlockStatements(node, !node.multiLine && isEmptyBlock(node));
+            emitBlockStatements(node, /*forceSingleLine*/ !node.multiLine && isEmptyBlock(node));
         }
         function emitBlockStatements(node, forceSingleLine) {
-            emitTokenWithComment(17, node.pos, writePunctuation, node);
-            var format = forceSingleLine || ts.getEmitFlags(node) & 1 ? 384 : 65;
+            emitTokenWithComment(17 /* OpenBraceToken */, node.pos, writePunctuation, /*contextNode*/ node);
+            var format = forceSingleLine || ts.getEmitFlags(node) & 1 /* SingleLine */ ? 384 /* SingleLineBlockStatements */ : 65 /* MultiLineBlockStatements */;
             emitList(node, node.statements, format);
-            emitTokenWithComment(18, node.statements.end, writePunctuation, node, !!(format & 1));
+            emitTokenWithComment(18 /* CloseBraceToken */, node.statements.end, writePunctuation, /*contextNode*/ node, /*indentLeading*/ !!(format & 1 /* MultiLine */));
         }
         function emitVariableStatement(node) {
             emitModifiers(node, node.modifiers);
@@ -61219,16 +78542,16 @@ var ts;
             }
         }
         function emitIfStatement(node) {
-            var openParenPos = emitTokenWithComment(90, node.pos, writeKeyword, node);
+            var openParenPos = emitTokenWithComment(90 /* IfKeyword */, node.pos, writeKeyword, node);
             writeSpace();
-            emitTokenWithComment(19, openParenPos, writePunctuation, node);
+            emitTokenWithComment(19 /* OpenParenToken */, openParenPos, writePunctuation, node);
             emitExpression(node.expression);
-            emitTokenWithComment(20, node.expression.end, writePunctuation, node);
+            emitTokenWithComment(20 /* CloseParenToken */, node.expression.end, writePunctuation, node);
             emitEmbeddedStatement(node, node.thenStatement);
             if (node.elseStatement) {
                 writeLineOrSpace(node);
-                emitTokenWithComment(82, node.thenStatement.end, writeKeyword, node);
-                if (node.elseStatement.kind === 217) {
+                emitTokenWithComment(82 /* ElseKeyword */, node.thenStatement.end, writeKeyword, node);
+                if (node.elseStatement.kind === 217 /* IfStatement */) {
                     writeSpace();
                     emit(node.elseStatement);
                 }
@@ -61238,14 +78561,14 @@ var ts;
             }
         }
         function emitWhileClause(node, startPos) {
-            var openParenPos = emitTokenWithComment(106, startPos, writeKeyword, node);
+            var openParenPos = emitTokenWithComment(106 /* WhileKeyword */, startPos, writeKeyword, node);
             writeSpace();
-            emitTokenWithComment(19, openParenPos, writePunctuation, node);
+            emitTokenWithComment(19 /* OpenParenToken */, openParenPos, writePunctuation, node);
             emitExpression(node.expression);
-            emitTokenWithComment(20, node.expression.end, writePunctuation, node);
+            emitTokenWithComment(20 /* CloseParenToken */, node.expression.end, writePunctuation, node);
         }
         function emitDoStatement(node) {
-            emitTokenWithComment(81, node.pos, writeKeyword, node);
+            emitTokenWithComment(81 /* DoKeyword */, node.pos, writeKeyword, node);
             emitEmbeddedStatement(node, node.statement);
             if (ts.isBlock(node.statement)) {
                 writeSpace();
@@ -61261,45 +78584,45 @@ var ts;
             emitEmbeddedStatement(node, node.statement);
         }
         function emitForStatement(node) {
-            var openParenPos = emitTokenWithComment(88, node.pos, writeKeyword, node);
+            var openParenPos = emitTokenWithComment(88 /* ForKeyword */, node.pos, writeKeyword, node);
             writeSpace();
-            var pos = emitTokenWithComment(19, openParenPos, writePunctuation, node);
+            var pos = emitTokenWithComment(19 /* OpenParenToken */, openParenPos, writePunctuation, /*contextNode*/ node);
             emitForBinding(node.initializer);
-            pos = emitTokenWithComment(25, node.initializer ? node.initializer.end : pos, writeSemicolon, node);
+            pos = emitTokenWithComment(25 /* SemicolonToken */, node.initializer ? node.initializer.end : pos, writeSemicolon, node);
             emitExpressionWithLeadingSpace(node.condition);
-            pos = emitTokenWithComment(25, node.condition ? node.condition.end : pos, writeSemicolon, node);
+            pos = emitTokenWithComment(25 /* SemicolonToken */, node.condition ? node.condition.end : pos, writeSemicolon, node);
             emitExpressionWithLeadingSpace(node.incrementor);
-            emitTokenWithComment(20, node.incrementor ? node.incrementor.end : pos, writePunctuation, node);
+            emitTokenWithComment(20 /* CloseParenToken */, node.incrementor ? node.incrementor.end : pos, writePunctuation, node);
             emitEmbeddedStatement(node, node.statement);
         }
         function emitForInStatement(node) {
-            var openParenPos = emitTokenWithComment(88, node.pos, writeKeyword, node);
+            var openParenPos = emitTokenWithComment(88 /* ForKeyword */, node.pos, writeKeyword, node);
             writeSpace();
-            emitTokenWithComment(19, openParenPos, writePunctuation, node);
+            emitTokenWithComment(19 /* OpenParenToken */, openParenPos, writePunctuation, node);
             emitForBinding(node.initializer);
             writeSpace();
-            emitTokenWithComment(92, node.initializer.end, writeKeyword, node);
+            emitTokenWithComment(92 /* InKeyword */, node.initializer.end, writeKeyword, node);
             writeSpace();
             emitExpression(node.expression);
-            emitTokenWithComment(20, node.expression.end, writePunctuation, node);
+            emitTokenWithComment(20 /* CloseParenToken */, node.expression.end, writePunctuation, node);
             emitEmbeddedStatement(node, node.statement);
         }
         function emitForOfStatement(node) {
-            var openParenPos = emitTokenWithComment(88, node.pos, writeKeyword, node);
+            var openParenPos = emitTokenWithComment(88 /* ForKeyword */, node.pos, writeKeyword, node);
             writeSpace();
             emitWithTrailingSpace(node.awaitModifier);
-            emitTokenWithComment(19, openParenPos, writePunctuation, node);
+            emitTokenWithComment(19 /* OpenParenToken */, openParenPos, writePunctuation, node);
             emitForBinding(node.initializer);
             writeSpace();
-            emitTokenWithComment(145, node.initializer.end, writeKeyword, node);
+            emitTokenWithComment(145 /* OfKeyword */, node.initializer.end, writeKeyword, node);
             writeSpace();
             emitExpression(node.expression);
-            emitTokenWithComment(20, node.expression.end, writePunctuation, node);
+            emitTokenWithComment(20 /* CloseParenToken */, node.expression.end, writePunctuation, node);
             emitEmbeddedStatement(node, node.statement);
         }
         function emitForBinding(node) {
             if (node !== undefined) {
-                if (node.kind === 233) {
+                if (node.kind === 233 /* VariableDeclarationList */) {
                     emit(node);
                 }
                 else {
@@ -61308,12 +78631,12 @@ var ts;
             }
         }
         function emitContinueStatement(node) {
-            emitTokenWithComment(77, node.pos, writeKeyword, node);
+            emitTokenWithComment(77 /* ContinueKeyword */, node.pos, writeKeyword, node);
             emitWithLeadingSpace(node.label);
             writeSemicolon();
         }
         function emitBreakStatement(node) {
-            emitTokenWithComment(72, node.pos, writeKeyword, node);
+            emitTokenWithComment(72 /* BreakKeyword */, node.pos, writeKeyword, node);
             emitWithLeadingSpace(node.label);
             writeSemicolon();
         }
@@ -61336,45 +78659,45 @@ var ts;
             }
             pos = writeTokenText(token, writer, pos);
             if (emitTrailingCommentsOfPosition && isSimilarNode && contextNode.end !== pos) {
-                emitTrailingCommentsOfPosition(pos, true);
+                emitTrailingCommentsOfPosition(pos, /*prefixSpace*/ true);
             }
             return pos;
         }
         function emitReturnStatement(node) {
-            emitTokenWithComment(96, node.pos, writeKeyword, node);
+            emitTokenWithComment(96 /* ReturnKeyword */, node.pos, writeKeyword, /*contextNode*/ node);
             emitExpressionWithLeadingSpace(node.expression);
             writeSemicolon();
         }
         function emitWithStatement(node) {
-            var openParenPos = emitTokenWithComment(107, node.pos, writeKeyword, node);
+            var openParenPos = emitTokenWithComment(107 /* WithKeyword */, node.pos, writeKeyword, node);
             writeSpace();
-            emitTokenWithComment(19, openParenPos, writePunctuation, node);
+            emitTokenWithComment(19 /* OpenParenToken */, openParenPos, writePunctuation, node);
             emitExpression(node.expression);
-            emitTokenWithComment(20, node.expression.end, writePunctuation, node);
+            emitTokenWithComment(20 /* CloseParenToken */, node.expression.end, writePunctuation, node);
             emitEmbeddedStatement(node, node.statement);
         }
         function emitSwitchStatement(node) {
-            var openParenPos = emitTokenWithComment(98, node.pos, writeKeyword, node);
+            var openParenPos = emitTokenWithComment(98 /* SwitchKeyword */, node.pos, writeKeyword, node);
             writeSpace();
-            emitTokenWithComment(19, openParenPos, writePunctuation, node);
+            emitTokenWithComment(19 /* OpenParenToken */, openParenPos, writePunctuation, node);
             emitExpression(node.expression);
-            emitTokenWithComment(20, node.expression.end, writePunctuation, node);
+            emitTokenWithComment(20 /* CloseParenToken */, node.expression.end, writePunctuation, node);
             writeSpace();
             emit(node.caseBlock);
         }
         function emitLabeledStatement(node) {
             emit(node.label);
-            emitTokenWithComment(56, node.label.end, writePunctuation, node);
+            emitTokenWithComment(56 /* ColonToken */, node.label.end, writePunctuation, node);
             writeSpace();
             emit(node.statement);
         }
         function emitThrowStatement(node) {
-            emitTokenWithComment(100, node.pos, writeKeyword, node);
+            emitTokenWithComment(100 /* ThrowKeyword */, node.pos, writeKeyword, node);
             emitExpressionWithLeadingSpace(node.expression);
             writeSemicolon();
         }
         function emitTryStatement(node) {
-            emitTokenWithComment(102, node.pos, writeKeyword, node);
+            emitTokenWithComment(102 /* TryKeyword */, node.pos, writeKeyword, node);
             writeSpace();
             emit(node.tryBlock);
             if (node.catchClause) {
@@ -61383,15 +78706,18 @@ var ts;
             }
             if (node.finallyBlock) {
                 writeLineOrSpace(node);
-                emitTokenWithComment(87, (node.catchClause || node.tryBlock).end, writeKeyword, node);
+                emitTokenWithComment(87 /* FinallyKeyword */, (node.catchClause || node.tryBlock).end, writeKeyword, node);
                 writeSpace();
                 emit(node.finallyBlock);
             }
         }
         function emitDebuggerStatement(node) {
-            writeToken(78, node.pos, writeKeyword);
+            writeToken(78 /* DebuggerKeyword */, node.pos, writeKeyword);
             writeSemicolon();
         }
+        //
+        // Declarations
+        //
         function emitVariableDeclaration(node) {
             emit(node.name);
             emitTypeAnnotation(node.type);
@@ -61400,7 +78726,7 @@ var ts;
         function emitVariableDeclarationList(node) {
             writeKeyword(ts.isLet(node) ? "let" : ts.isConst(node) ? "const" : "var");
             writeSpace();
-            emitList(node, node.declarations, 272);
+            emitList(node, node.declarations, 272 /* VariableDeclarationList */);
         }
         function emitFunctionDeclaration(node) {
             emitFunctionDeclarationOrExpression(node);
@@ -61411,7 +78737,7 @@ var ts;
             writeKeyword("function");
             emit(node.asteriskToken);
             writeSpace();
-            emitIdentifierName(node.name);
+            emitIdentifierName(node.name); // TODO: GH#18217
             emitSignatureAndBody(node, emitSignatureHead);
         }
         function emitBlockCallback(_hint, body) {
@@ -61421,7 +78747,7 @@ var ts;
             var body = node.body;
             if (body) {
                 if (ts.isBlock(body)) {
-                    var indentedFlag = ts.getEmitFlags(node) & 65536;
+                    var indentedFlag = ts.getEmitFlags(node) & 65536 /* Indented */;
                     if (indentedFlag) {
                         increaseIndent();
                     }
@@ -61430,7 +78756,7 @@ var ts;
                     generateNames(node.body);
                     emitSignatureHead(node);
                     if (onEmitNode) {
-                        onEmitNode(4, body, emitBlockCallback);
+                        onEmitNode(4 /* Unspecified */, body, emitBlockCallback);
                     }
                     else {
                         emitBlockFunctionBody(body);
@@ -61457,7 +78783,13 @@ var ts;
             emitTypeAnnotation(node.type);
         }
         function shouldEmitBlockFunctionBodyOnSingleLine(body) {
-            if (ts.getEmitFlags(body) & 1) {
+            // We must emit a function body as a single-line body in the following case:
+            // * The body has NodeEmitFlags.SingleLine specified.
+            // We must emit a function body as a multi-line body in the following cases:
+            // * The body is explicitly marked as multi-line.
+            // * A non-synthesized body's start and end position are on different lines.
+            // * Any statement in the body starts on a new line.
+            if (ts.getEmitFlags(body) & 1 /* SingleLine */) {
                 return true;
             }
             if (body.multiLine) {
@@ -61466,14 +78798,14 @@ var ts;
             if (!ts.nodeIsSynthesized(body) && !ts.rangeIsOnSingleLine(body, currentSourceFile)) {
                 return false;
             }
-            if (shouldWriteLeadingLineTerminator(body, body.statements, 2)
-                || shouldWriteClosingLineTerminator(body, body.statements, 2)) {
+            if (shouldWriteLeadingLineTerminator(body, body.statements, 2 /* PreserveLines */)
+                || shouldWriteClosingLineTerminator(body, body.statements, 2 /* PreserveLines */)) {
                 return false;
             }
             var previousStatement;
             for (var _a = 0, _b = body.statements; _a < _b.length; _a++) {
                 var statement = _b[_a];
-                if (shouldWriteSeparatingLineTerminator(previousStatement, statement, 2)) {
+                if (shouldWriteSeparatingLineTerminator(previousStatement, statement, 2 /* PreserveLines */)) {
                     return false;
                 }
                 previousStatement = statement;
@@ -61494,22 +78826,23 @@ var ts;
                 emitBlockFunctionBody(body);
             }
             decreaseIndent();
-            writeToken(18, body.statements.end, writePunctuation, body);
+            writeToken(18 /* CloseBraceToken */, body.statements.end, writePunctuation, body);
         }
         function emitBlockFunctionBodyOnSingleLine(body) {
-            emitBlockFunctionBodyWorker(body, true);
+            emitBlockFunctionBodyWorker(body, /*emitBlockFunctionBodyOnSingleLine*/ true);
         }
         function emitBlockFunctionBodyWorker(body, emitBlockFunctionBodyOnSingleLine) {
-            var statementOffset = emitPrologueDirectives(body.statements, true);
+            // Emit all the prologue directives (like "use strict").
+            var statementOffset = emitPrologueDirectives(body.statements, /*startWithNewLine*/ true);
             var pos = writer.getTextPos();
             emitHelpers(body);
             if (statementOffset === 0 && pos === writer.getTextPos() && emitBlockFunctionBodyOnSingleLine) {
                 decreaseIndent();
-                emitList(body, body.statements, 384);
+                emitList(body, body.statements, 384 /* SingleLineFunctionBodyStatements */);
                 increaseIndent();
             }
             else {
-                emitList(body, body.statements, 1, statementOffset);
+                emitList(body, body.statements, 1 /* MultiLineFunctionBodyStatements */, statementOffset);
             }
         }
         function emitClassDeclaration(node) {
@@ -61524,15 +78857,15 @@ var ts;
                 writeSpace();
                 emitIdentifierName(node.name);
             }
-            var indentedFlag = ts.getEmitFlags(node) & 65536;
+            var indentedFlag = ts.getEmitFlags(node) & 65536 /* Indented */;
             if (indentedFlag) {
                 increaseIndent();
             }
             emitTypeParameters(node, node.typeParameters);
-            emitList(node, node.heritageClauses, 0);
+            emitList(node, node.heritageClauses, 0 /* ClassHeritageClauses */);
             writeSpace();
             writePunctuation("{");
-            emitList(node, node.members, 65);
+            emitList(node, node.members, 65 /* ClassMembers */);
             writePunctuation("}");
             if (indentedFlag) {
                 decreaseIndent();
@@ -61545,10 +78878,10 @@ var ts;
             writeSpace();
             emit(node.name);
             emitTypeParameters(node, node.typeParameters);
-            emitList(node, node.heritageClauses, 256);
+            emitList(node, node.heritageClauses, 256 /* HeritageClauses */);
             writeSpace();
             writePunctuation("{");
-            emitList(node, node.members, 65);
+            emitList(node, node.members, 65 /* InterfaceMembers */);
             writePunctuation("}");
         }
         function emitTypeAliasDeclaration(node) {
@@ -61571,20 +78904,20 @@ var ts;
             emit(node.name);
             writeSpace();
             writePunctuation("{");
-            emitList(node, node.members, 81);
+            emitList(node, node.members, 81 /* EnumMembers */);
             writePunctuation("}");
         }
         function emitModuleDeclaration(node) {
             emitModifiers(node, node.modifiers);
-            if (~node.flags & 512) {
-                writeKeyword(node.flags & 16 ? "namespace" : "module");
+            if (~node.flags & 512 /* GlobalAugmentation */) {
+                writeKeyword(node.flags & 16 /* Namespace */ ? "namespace" : "module");
                 writeSpace();
             }
             emit(node.name);
             var body = node.body;
             if (!body)
                 return writeSemicolon();
-            while (body.kind === 239) {
+            while (body.kind === 239 /* ModuleDeclaration */) {
                 writePunctuation(".");
                 emit(body.name);
                 body = body.body;
@@ -61595,27 +78928,27 @@ var ts;
         function emitModuleBlock(node) {
             pushNameGenerationScope(node);
             ts.forEach(node.statements, generateNames);
-            emitBlockStatements(node, isEmptyBlock(node));
+            emitBlockStatements(node, /*forceSingleLine*/ isEmptyBlock(node));
             popNameGenerationScope(node);
         }
         function emitCaseBlock(node) {
-            emitTokenWithComment(17, node.pos, writePunctuation, node);
-            emitList(node, node.clauses, 65);
-            emitTokenWithComment(18, node.clauses.end, writePunctuation, node, true);
+            emitTokenWithComment(17 /* OpenBraceToken */, node.pos, writePunctuation, node);
+            emitList(node, node.clauses, 65 /* CaseBlockClauses */);
+            emitTokenWithComment(18 /* CloseBraceToken */, node.clauses.end, writePunctuation, node, /*indentLeading*/ true);
         }
         function emitImportEqualsDeclaration(node) {
             emitModifiers(node, node.modifiers);
-            emitTokenWithComment(91, node.modifiers ? node.modifiers.end : node.pos, writeKeyword, node);
+            emitTokenWithComment(91 /* ImportKeyword */, node.modifiers ? node.modifiers.end : node.pos, writeKeyword, node);
             writeSpace();
             emit(node.name);
             writeSpace();
-            emitTokenWithComment(58, node.name.end, writePunctuation, node);
+            emitTokenWithComment(58 /* EqualsToken */, node.name.end, writePunctuation, node);
             writeSpace();
             emitModuleReference(node.moduleReference);
             writeSemicolon();
         }
         function emitModuleReference(node) {
-            if (node.kind === 71) {
+            if (node.kind === 71 /* Identifier */) {
                 emitExpression(node);
             }
             else {
@@ -61624,12 +78957,12 @@ var ts;
         }
         function emitImportDeclaration(node) {
             emitModifiers(node, node.modifiers);
-            emitTokenWithComment(91, node.modifiers ? node.modifiers.end : node.pos, writeKeyword, node);
+            emitTokenWithComment(91 /* ImportKeyword */, node.modifiers ? node.modifiers.end : node.pos, writeKeyword, node);
             writeSpace();
             if (node.importClause) {
                 emit(node.importClause);
                 writeSpace();
-                emitTokenWithComment(143, node.importClause.end, writeKeyword, node);
+                emitTokenWithComment(143 /* FromKeyword */, node.importClause.end, writeKeyword, node);
                 writeSpace();
             }
             emitExpression(node.moduleSpecifier);
@@ -61638,15 +78971,15 @@ var ts;
         function emitImportClause(node) {
             emit(node.name);
             if (node.name && node.namedBindings) {
-                emitTokenWithComment(26, node.name.end, writePunctuation, node);
+                emitTokenWithComment(26 /* CommaToken */, node.name.end, writePunctuation, node);
                 writeSpace();
             }
             emit(node.namedBindings);
         }
         function emitNamespaceImport(node) {
-            var asPos = emitTokenWithComment(39, node.pos, writePunctuation, node);
+            var asPos = emitTokenWithComment(39 /* AsteriskToken */, node.pos, writePunctuation, node);
             writeSpace();
-            emitTokenWithComment(118, asPos, writeKeyword, node);
+            emitTokenWithComment(118 /* AsKeyword */, asPos, writeKeyword, node);
             writeSpace();
             emit(node.name);
         }
@@ -61657,42 +78990,42 @@ var ts;
             emitImportOrExportSpecifier(node);
         }
         function emitExportAssignment(node) {
-            var nextPos = emitTokenWithComment(84, node.pos, writeKeyword, node);
+            var nextPos = emitTokenWithComment(84 /* ExportKeyword */, node.pos, writeKeyword, node);
             writeSpace();
             if (node.isExportEquals) {
-                emitTokenWithComment(58, nextPos, writeOperator, node);
+                emitTokenWithComment(58 /* EqualsToken */, nextPos, writeOperator, node);
             }
             else {
-                emitTokenWithComment(79, nextPos, writeKeyword, node);
+                emitTokenWithComment(79 /* DefaultKeyword */, nextPos, writeKeyword, node);
             }
             writeSpace();
             emitExpression(node.expression);
             writeSemicolon();
         }
         function emitExportDeclaration(node) {
-            var nextPos = emitTokenWithComment(84, node.pos, writeKeyword, node);
+            var nextPos = emitTokenWithComment(84 /* ExportKeyword */, node.pos, writeKeyword, node);
             writeSpace();
             if (node.exportClause) {
                 emit(node.exportClause);
             }
             else {
-                nextPos = emitTokenWithComment(39, nextPos, writePunctuation, node);
+                nextPos = emitTokenWithComment(39 /* AsteriskToken */, nextPos, writePunctuation, node);
             }
             if (node.moduleSpecifier) {
                 writeSpace();
                 var fromPos = node.exportClause ? node.exportClause.end : nextPos;
-                emitTokenWithComment(143, fromPos, writeKeyword, node);
+                emitTokenWithComment(143 /* FromKeyword */, fromPos, writeKeyword, node);
                 writeSpace();
                 emitExpression(node.moduleSpecifier);
             }
             writeSemicolon();
         }
         function emitNamespaceExportDeclaration(node) {
-            var nextPos = emitTokenWithComment(84, node.pos, writeKeyword, node);
+            var nextPos = emitTokenWithComment(84 /* ExportKeyword */, node.pos, writeKeyword, node);
             writeSpace();
-            nextPos = emitTokenWithComment(118, nextPos, writeKeyword, node);
+            nextPos = emitTokenWithComment(118 /* AsKeyword */, nextPos, writeKeyword, node);
             writeSpace();
-            nextPos = emitTokenWithComment(130, nextPos, writeKeyword, node);
+            nextPos = emitTokenWithComment(130 /* NamespaceKeyword */, nextPos, writeKeyword, node);
             writeSpace();
             emit(node.name);
             writeSemicolon();
@@ -61705,27 +79038,33 @@ var ts;
         }
         function emitNamedImportsOrExports(node) {
             writePunctuation("{");
-            emitList(node, node.elements, 262576);
+            emitList(node, node.elements, 262576 /* NamedImportsOrExportsElements */);
             writePunctuation("}");
         }
         function emitImportOrExportSpecifier(node) {
             if (node.propertyName) {
                 emit(node.propertyName);
                 writeSpace();
-                emitTokenWithComment(118, node.propertyName.end, writeKeyword, node);
+                emitTokenWithComment(118 /* AsKeyword */, node.propertyName.end, writeKeyword, node);
                 writeSpace();
             }
             emit(node.name);
         }
+        //
+        // Module references
+        //
         function emitExternalModuleReference(node) {
             writeKeyword("require");
             writePunctuation("(");
             emitExpression(node.expression);
             writePunctuation(")");
         }
+        //
+        // JSX
+        //
         function emitJsxElement(node) {
             emit(node.openingElement);
-            emitList(node, node.children, 131072);
+            emitList(node, node.children, 131072 /* JsxElementOrFragmentChildren */);
             emit(node.closingElement);
         }
         function emitJsxSelfClosingElement(node) {
@@ -61737,7 +79076,7 @@ var ts;
         }
         function emitJsxFragment(node) {
             emit(node.openingFragment);
-            emitList(node, node.children, 131072);
+            emitList(node, node.children, 131072 /* JsxElementOrFragmentChildren */);
             emit(node.closingFragment);
         }
         function emitJsxOpeningElementOrFragment(node) {
@@ -61753,7 +79092,7 @@ var ts;
         }
         function emitJsxText(node) {
             commitPendingSemicolon();
-            writer.writeLiteral(getTextOfNode(node, true));
+            writer.writeLiteral(getTextOfNode(node, /*includeTrivia*/ true));
         }
         function emitJsxClosingElementOrFragment(node) {
             writePunctuation("</");
@@ -61763,11 +79102,11 @@ var ts;
             writePunctuation(">");
         }
         function emitJsxAttributes(node) {
-            emitList(node, node.properties, 131328);
+            emitList(node, node.properties, 131328 /* JsxElementAttributes */);
         }
         function emitJsxAttribute(node) {
             emit(node.name);
-            emitNodeWithPrefix("=", writePunctuation, node.initializer, emit);
+            emitNodeWithPrefix("=", writePunctuation, node.initializer, emit); // TODO: GH#18217
         }
         function emitJsxSpreadAttribute(node) {
             writePunctuation("{...");
@@ -61783,36 +79122,41 @@ var ts;
             }
         }
         function emitJsxTagName(node) {
-            if (node.kind === 71) {
+            if (node.kind === 71 /* Identifier */) {
                 emitExpression(node);
             }
             else {
                 emit(node);
             }
         }
+        //
+        // Clauses
+        //
         function emitCaseClause(node) {
-            emitTokenWithComment(73, node.pos, writeKeyword, node);
+            emitTokenWithComment(73 /* CaseKeyword */, node.pos, writeKeyword, node);
             writeSpace();
             emitExpression(node.expression);
             emitCaseOrDefaultClauseRest(node, node.statements, node.expression.end);
         }
         function emitDefaultClause(node) {
-            var pos = emitTokenWithComment(79, node.pos, writeKeyword, node);
+            var pos = emitTokenWithComment(79 /* DefaultKeyword */, node.pos, writeKeyword, node);
             emitCaseOrDefaultClauseRest(node, node.statements, pos);
         }
         function emitCaseOrDefaultClauseRest(parentNode, statements, colonPos) {
             var emitAsSingleStatement = statements.length === 1 &&
-                (ts.nodeIsSynthesized(parentNode) ||
+                (
+                // treat synthesized nodes as located on the same line for emit purposes
+                ts.nodeIsSynthesized(parentNode) ||
                     ts.nodeIsSynthesized(statements[0]) ||
                     ts.rangeStartPositionsAreOnSameLine(parentNode, statements[0], currentSourceFile));
-            var format = 81985;
+            var format = 81985 /* CaseOrDefaultClauseStatements */;
             if (emitAsSingleStatement) {
-                writeToken(56, colonPos, writePunctuation, parentNode);
+                writeToken(56 /* ColonToken */, colonPos, writePunctuation, parentNode);
                 writeSpace();
-                format &= ~(1 | 64);
+                format &= ~(1 /* MultiLine */ | 64 /* Indented */);
             }
             else {
-                emitTokenWithComment(56, colonPos, writePunctuation, parentNode);
+                emitTokenWithComment(56 /* ColonToken */, colonPos, writePunctuation, parentNode);
             }
             emitList(parentNode, statements, format);
         }
@@ -61820,25 +79164,35 @@ var ts;
             writeSpace();
             writeTokenText(node.token, writeKeyword);
             writeSpace();
-            emitList(node, node.types, 272);
+            emitList(node, node.types, 272 /* HeritageClauseTypes */);
         }
         function emitCatchClause(node) {
-            var openParenPos = emitTokenWithComment(74, node.pos, writeKeyword, node);
+            var openParenPos = emitTokenWithComment(74 /* CatchKeyword */, node.pos, writeKeyword, node);
             writeSpace();
             if (node.variableDeclaration) {
-                emitTokenWithComment(19, openParenPos, writePunctuation, node);
+                emitTokenWithComment(19 /* OpenParenToken */, openParenPos, writePunctuation, node);
                 emit(node.variableDeclaration);
-                emitTokenWithComment(20, node.variableDeclaration.end, writePunctuation, node);
+                emitTokenWithComment(20 /* CloseParenToken */, node.variableDeclaration.end, writePunctuation, node);
                 writeSpace();
             }
             emit(node.block);
         }
+        //
+        // Property assignments
+        //
         function emitPropertyAssignment(node) {
             emit(node.name);
             writePunctuation(":");
             writeSpace();
+            // This is to ensure that we emit comment in the following case:
+            //      For example:
+            //          obj = {
+            //              id: /*comment1*/ ()=>void
+            //          }
+            // "comment1" is not considered to be leading comment for node.initializer
+            // but rather a trailing comment on the previous node.
             var initializer = node.initializer;
-            if (emitTrailingCommentsOfPosition && (ts.getEmitFlags(initializer) & 512) === 0) {
+            if (emitTrailingCommentsOfPosition && (ts.getEmitFlags(initializer) & 512 /* NoLeadingComments */) === 0) {
                 var commentRange = ts.getCommentRange(initializer);
                 emitTrailingCommentsOfPosition(commentRange.pos);
             }
@@ -61859,14 +79213,22 @@ var ts;
                 emitExpression(node.expression);
             }
         }
+        //
+        // Enum
+        //
         function emitEnumMember(node) {
             emit(node.name);
             emitInitializer(node.initializer, node.name.end, node);
         }
+        //
+        // Top-level nodes
+        //
         function emitSourceFile(node) {
             writeLine();
             var statements = node.statements;
             if (emitBodyWithDetachedComments) {
+                // Emit detached comment if there are no prologue directives or if the first node is synthesized.
+                // The synthesized node will have no leading comment so some comments may be missed.
                 var shouldEmitDetachedComment = statements.length === 0 ||
                     !ts.isPrologueDirective(statements[0]) ||
                     ts.nodeIsSynthesized(statements[0]);
@@ -61923,15 +79285,20 @@ var ts;
             emitHelpers(node);
             var index = ts.findIndex(statements, function (statement) { return !ts.isPrologueDirective(statement); });
             emitTripleSlashDirectivesIfNeeded(node);
-            emitList(node, statements, 1, index === -1 ? statements.length : index);
+            emitList(node, statements, 1 /* MultiLine */, index === -1 ? statements.length : index);
             popNameGenerationScope(node);
         }
+        // Transformation nodes
         function emitPartiallyEmittedExpression(node) {
             emitExpression(node.expression);
         }
         function emitCommaList(node) {
-            emitExpressionList(node, node.elements, 272);
+            emitExpressionList(node, node.elements, 272 /* CommaListElements */);
         }
+        /**
+         * Emits any prologue directives at the start of a Statement list, returning the
+         * number of prologue directives written to the output.
+         */
         function emitPrologueDirectives(statements, startWithNewLine, seenPrologueDirectives) {
             for (var i = 0; i < statements.length; i++) {
                 var statement = statements[i];
@@ -61948,6 +79315,7 @@ var ts;
                     }
                 }
                 else {
+                    // return index of the first non prologue directive
                     return i;
                 }
             }
@@ -61963,7 +79331,7 @@ var ts;
                 for (var _a = 0, _b = sourceFileOrBundle.sourceFiles; _a < _b.length; _a++) {
                     var sourceFile = _b[_a];
                     setSourceFile(sourceFile);
-                    emitPrologueDirectives(sourceFile.statements, true, seenPrologueDirectives);
+                    emitPrologueDirectives(sourceFile.statements, /*startWithNewLine*/ true, seenPrologueDirectives);
                 }
             }
         }
@@ -61979,12 +79347,16 @@ var ts;
             else {
                 for (var _a = 0, _b = sourceFileOrBundle.sourceFiles; _a < _b.length; _a++) {
                     var sourceFile = _b[_a];
+                    // Emit only the first encountered shebang
                     if (emitShebangIfNeeded(sourceFile)) {
                         break;
                     }
                 }
             }
         }
+        //
+        // Helpers
+        //
         function emitNodeWithWriter(node, writer) {
             if (!node)
                 return;
@@ -61995,7 +79367,7 @@ var ts;
         }
         function emitModifiers(node, modifiers) {
             if (modifiers && modifiers.length) {
-                emitList(node, modifiers, 131328);
+                emitList(node, modifiers, 131328 /* Modifiers */);
                 writeSpace();
             }
         }
@@ -62009,7 +79381,7 @@ var ts;
         function emitInitializer(node, equalCommentStartPos, container) {
             if (node) {
                 writeSpace();
-                emitTokenWithComment(58, equalCommentStartPos, writeOperator, container);
+                emitTokenWithComment(58 /* EqualsToken */, equalCommentStartPos, writeOperator, container);
                 writeSpace();
                 emitExpression(node);
             }
@@ -62039,7 +79411,7 @@ var ts;
             }
         }
         function emitEmbeddedStatement(parent, node) {
-            if (ts.isBlock(node) || ts.getEmitFlags(parent) & 1) {
+            if (ts.isBlock(node) || ts.getEmitFlags(parent) & 1 /* SingleLine */) {
                 writeSpace();
                 emit(node);
             }
@@ -62051,65 +79423,65 @@ var ts;
             }
         }
         function emitDecorators(parentNode, decorators) {
-            emitList(parentNode, decorators, 24577);
+            emitList(parentNode, decorators, 24577 /* Decorators */);
         }
         function emitTypeArguments(parentNode, typeArguments) {
-            emitList(parentNode, typeArguments, 26896);
+            emitList(parentNode, typeArguments, 26896 /* TypeArguments */);
         }
         function emitTypeParameters(parentNode, typeParameters) {
-            if (ts.isFunctionLike(parentNode) && parentNode.typeArguments) {
+            if (ts.isFunctionLike(parentNode) && parentNode.typeArguments) { // Quick info uses type arguments in place of type parameters on instantiated signatures
                 return emitTypeArguments(parentNode, parentNode.typeArguments);
             }
-            emitList(parentNode, typeParameters, 26896);
+            emitList(parentNode, typeParameters, 26896 /* TypeParameters */);
         }
         function emitParameters(parentNode, parameters) {
-            emitList(parentNode, parameters, 1296);
+            emitList(parentNode, parameters, 1296 /* Parameters */);
         }
         function canEmitSimpleArrowHead(parentNode, parameters) {
             var parameter = ts.singleOrUndefined(parameters);
             return parameter
-                && parameter.pos === parentNode.pos
-                && !(ts.isArrowFunction(parentNode) && parentNode.type)
-                && !ts.some(parentNode.decorators)
-                && !ts.some(parentNode.modifiers)
-                && !ts.some(parentNode.typeParameters)
-                && !ts.some(parameter.decorators)
-                && !ts.some(parameter.modifiers)
-                && !parameter.dotDotDotToken
-                && !parameter.questionToken
-                && !parameter.type
-                && !parameter.initializer
-                && ts.isIdentifier(parameter.name);
+                && parameter.pos === parentNode.pos // may not have parsed tokens between parent and parameter
+                && !(ts.isArrowFunction(parentNode) && parentNode.type) // arrow function may not have return type annotation
+                && !ts.some(parentNode.decorators) // parent may not have decorators
+                && !ts.some(parentNode.modifiers) // parent may not have modifiers
+                && !ts.some(parentNode.typeParameters) // parent may not have type parameters
+                && !ts.some(parameter.decorators) // parameter may not have decorators
+                && !ts.some(parameter.modifiers) // parameter may not have modifiers
+                && !parameter.dotDotDotToken // parameter may not be rest
+                && !parameter.questionToken // parameter may not be optional
+                && !parameter.type // parameter may not have a type annotation
+                && !parameter.initializer // parameter may not have an initializer
+                && ts.isIdentifier(parameter.name); // parameter name must be identifier
         }
         function emitParametersForArrow(parentNode, parameters) {
             if (canEmitSimpleArrowHead(parentNode, parameters)) {
-                emitList(parentNode, parameters, 1296 & ~1024);
+                emitList(parentNode, parameters, 1296 /* Parameters */ & ~1024 /* Parenthesis */);
             }
             else {
                 emitParameters(parentNode, parameters);
             }
         }
         function emitParametersForIndexSignature(parentNode, parameters) {
-            emitList(parentNode, parameters, 4432);
+            emitList(parentNode, parameters, 4432 /* IndexSignatureParameters */);
         }
         function emitList(parentNode, children, format, start, count) {
             emitNodeList(emit, parentNode, children, format, start, count);
         }
         function emitExpressionList(parentNode, children, format, start, count) {
-            emitNodeList(emitExpression, parentNode, children, format, start, count);
+            emitNodeList(emitExpression, parentNode, children, format, start, count); // TODO: GH#18217
         }
         function writeDelimiter(format) {
-            switch (format & 28) {
-                case 0:
+            switch (format & 28 /* DelimitersMask */) {
+                case 0 /* None */:
                     break;
-                case 16:
+                case 16 /* CommaDelimited */:
                     writePunctuation(",");
                     break;
-                case 4:
+                case 4 /* BarDelimited */:
                     writeSpace();
                     writePunctuation("|");
                     break;
-                case 8:
+                case 8 /* AmpersandDelimited */:
                     writeSpace();
                     writePunctuation("&");
                     break;
@@ -62119,11 +79491,11 @@ var ts;
             if (start === void 0) { start = 0; }
             if (count === void 0) { count = children ? children.length - start : 0; }
             var isUndefined = children === undefined;
-            if (isUndefined && format & 8192) {
+            if (isUndefined && format & 8192 /* OptionalIfUndefined */) {
                 return;
             }
             var isEmpty = children === undefined || start >= children.length || count === 0;
-            if (isEmpty && format & 16384) {
+            if (isEmpty && format & 16384 /* OptionalIfEmpty */) {
                 if (onBeforeEmitNodeArray) {
                     onBeforeEmitNodeArray(children);
                 }
@@ -62132,57 +79504,73 @@ var ts;
                 }
                 return;
             }
-            if (format & 7680) {
+            if (format & 7680 /* BracketsMask */) {
                 writePunctuation(getOpeningBracket(format));
                 if (isEmpty && !isUndefined) {
-                    emitTrailingCommentsOfPosition(children.pos, true);
+                    // TODO: GH#18217
+                    emitTrailingCommentsOfPosition(children.pos, /*prefixSpace*/ true); // Emit comments within empty bracketed lists
                 }
             }
             if (onBeforeEmitNodeArray) {
                 onBeforeEmitNodeArray(children);
             }
             if (isEmpty) {
-                if (format & 1) {
+                // Write a line terminator if the parent node was multi-line
+                if (format & 1 /* MultiLine */) {
                     writeLine();
                 }
-                else if (format & 128 && !(format & 262144)) {
+                else if (format & 128 /* SpaceBetweenBraces */ && !(format & 262144 /* NoSpaceIfEmpty */)) {
                     writeSpace();
                 }
             }
             else {
-                var mayEmitInterveningComments = (format & 131072) === 0;
+                // Write the opening line terminator or leading whitespace.
+                var mayEmitInterveningComments = (format & 131072 /* NoInterveningComments */) === 0;
                 var shouldEmitInterveningComments = mayEmitInterveningComments;
-                if (shouldWriteLeadingLineTerminator(parentNode, children, format)) {
+                if (shouldWriteLeadingLineTerminator(parentNode, children, format)) { // TODO: GH#18217
                     writeLine();
                     shouldEmitInterveningComments = false;
                 }
-                else if (format & 128) {
+                else if (format & 128 /* SpaceBetweenBraces */) {
                     writeSpace();
                 }
-                if (format & 64) {
+                // Increase the indent, if requested.
+                if (format & 64 /* Indented */) {
                     increaseIndent();
                 }
+                // Emit each child.
                 var previousSibling = void 0;
                 var shouldDecreaseIndentAfterEmit = false;
                 for (var i = 0; i < count; i++) {
                     var child = children[start + i];
+                    // Write the delimiter if this is not the first node.
                     if (previousSibling) {
-                        if (format & 28 && previousSibling.end !== parentNode.end) {
+                        // i.e
+                        //      function commentedParameters(
+                        //          /* Parameter a */
+                        //          a
+                        //          /* End of parameter a */ -> this comment isn't considered to be trailing comment of parameter "a" due to newline
+                        //          ,
+                        if (format & 28 /* DelimitersMask */ && previousSibling.end !== parentNode.end) {
                             emitLeadingCommentsOfPosition(previousSibling.end);
                         }
                         writeDelimiter(format);
+                        // Write either a line terminator or whitespace to separate the elements.
                         if (shouldWriteSeparatingLineTerminator(previousSibling, child, format)) {
-                            if ((format & (3 | 64)) === 0) {
+                            // If a synthesized node in a single-line list starts on a new
+                            // line, we should increase the indent.
+                            if ((format & (3 /* LinesMask */ | 64 /* Indented */)) === 0 /* SingleLine */) {
                                 increaseIndent();
                                 shouldDecreaseIndentAfterEmit = true;
                             }
                             writeLine();
                             shouldEmitInterveningComments = false;
                         }
-                        else if (previousSibling && format & 256) {
+                        else if (previousSibling && format & 256 /* SpaceBetweenSiblings */) {
                             writeSpace();
                         }
                     }
+                    // Emit this child.
                     if (shouldEmitInterveningComments) {
                         if (emitTrailingCommentsOfPosition) {
                             var commentRange = ts.getCommentRange(child);
@@ -62199,29 +79587,39 @@ var ts;
                     }
                     previousSibling = child;
                 }
-                var hasTrailingComma = (format & 32) && children.hasTrailingComma;
-                if (format & 16 && hasTrailingComma) {
+                // Write a trailing comma, if requested.
+                var hasTrailingComma = (format & 32 /* AllowTrailingComma */) && children.hasTrailingComma;
+                if (format & 16 /* CommaDelimited */ && hasTrailingComma) {
                     writePunctuation(",");
                 }
-                if (previousSibling && format & 28 && previousSibling.end !== parentNode.end && !(ts.getEmitFlags(previousSibling) & 1024)) {
+                // Emit any trailing comment of the last element in the list
+                // i.e
+                //       var array = [...
+                //          2
+                //          /* end of element 2 */
+                //       ];
+                if (previousSibling && format & 28 /* DelimitersMask */ && previousSibling.end !== parentNode.end && !(ts.getEmitFlags(previousSibling) & 1024 /* NoTrailingComments */)) {
                     emitLeadingCommentsOfPosition(previousSibling.end);
                 }
-                if (format & 64) {
+                // Decrease the indent, if requested.
+                if (format & 64 /* Indented */) {
                     decreaseIndent();
                 }
+                // Write the closing line terminator or closing whitespace.
                 if (shouldWriteClosingLineTerminator(parentNode, children, format)) {
                     writeLine();
                 }
-                else if (format & 128) {
+                else if (format & 128 /* SpaceBetweenBraces */) {
                     writeSpace();
                 }
             }
             if (onAfterEmitNodeArray) {
                 onAfterEmitNodeArray(children);
             }
-            if (format & 7680) {
+            if (format & 7680 /* BracketsMask */) {
                 if (isEmpty && !isUndefined) {
-                    emitLeadingCommentsOfPosition(children.end);
+                    // TODO: GH#18217
+                    emitLeadingCommentsOfPosition(children.end); // Emit leading comments within empty lists
                 }
                 writePunctuation(getClosingBracket(format));
             }
@@ -62310,7 +79708,7 @@ var ts;
             return pos < 0 ? pos : pos + tokenString.length;
         }
         function writeLineOrSpace(node) {
-            if (ts.getEmitFlags(node) & 1) {
+            if (ts.getEmitFlags(node) & 1 /* SingleLine */) {
                 writeSpace();
             }
             else {
@@ -62320,8 +79718,8 @@ var ts;
         function writeLines(text) {
             var lines = text.split(/\r\n?|\n/g);
             var indentation = ts.guessIndentation(lines);
-            for (var _a = 0, lines_2 = lines; _a < lines_2.length; _a++) {
-                var lineText = lines_2[_a];
+            for (var _a = 0, lines_1 = lines; _a < lines_1.length; _a++) {
+                var lineText = lines_1[_a];
                 var line = indentation ? lineText.slice(indentation) : lineText;
                 if (line.length) {
                     writeLine();
@@ -62339,6 +79737,10 @@ var ts;
                 write(valueToWriteWhenNotIndenting);
             }
         }
+        // Helper function to decrease the indent if we previously indented.  Allows multiple
+        // previous indent values to be considered at a time.  This also allows caller to just
+        // call this once, passing in all their appropriate indent values, instead of needing
+        // to call this helper function multiple times.
         function decreaseIndentIf(value1, value2) {
             if (value1) {
                 decreaseIndent();
@@ -62348,11 +79750,11 @@ var ts;
             }
         }
         function shouldWriteLeadingLineTerminator(parentNode, children, format) {
-            if (format & 1) {
+            if (format & 1 /* MultiLine */) {
                 return true;
             }
-            if (format & 2) {
-                if (format & 32768) {
+            if (format & 2 /* PreserveLines */) {
+                if (format & 32768 /* PreferNewLine */) {
                     return true;
                 }
                 var firstChild = children[0];
@@ -62371,10 +79773,10 @@ var ts;
             }
         }
         function shouldWriteSeparatingLineTerminator(previousNode, nextNode, format) {
-            if (format & 1) {
+            if (format & 1 /* MultiLine */) {
                 return true;
             }
-            else if (format & 2) {
+            else if (format & 2 /* PreserveLines */) {
                 if (previousNode === undefined || nextNode === undefined) {
                     return false;
                 }
@@ -62390,11 +79792,11 @@ var ts;
             }
         }
         function shouldWriteClosingLineTerminator(parentNode, children, format) {
-            if (format & 1) {
-                return (format & 65536) === 0;
+            if (format & 1 /* MultiLine */) {
+                return (format & 65536 /* NoTrailingNewLine */) === 0;
             }
-            else if (format & 2) {
-                if (format & 32768) {
+            else if (format & 2 /* PreserveLines */) {
+                if (format & 32768 /* PreferNewLine */) {
                     return true;
                 }
                 var lastChild = ts.lastOrUndefined(children);
@@ -62416,16 +79818,17 @@ var ts;
             if (ts.nodeIsSynthesized(node)) {
                 var startsOnNewLine = ts.getStartsOnNewLine(node);
                 if (startsOnNewLine === undefined) {
-                    return (format & 32768) !== 0;
+                    return (format & 32768 /* PreferNewLine */) !== 0;
                 }
                 return startsOnNewLine;
             }
-            return (format & 32768) !== 0;
+            return (format & 32768 /* PreferNewLine */) !== 0;
         }
         function needsIndentation(parent, node1, node2) {
             parent = skipSynthesizedParentheses(parent);
             node1 = skipSynthesizedParentheses(node1);
             node2 = skipSynthesizedParentheses(node2);
+            // Always use a newline for synthesized code if the synthesizer desires it.
             if (ts.getStartsOnNewLine(node2)) {
                 return true;
             }
@@ -62439,7 +79842,7 @@ var ts;
                 && ts.rangeEndIsOnSameLineAsRangeStart(block, block, currentSourceFile);
         }
         function skipSynthesizedParentheses(node) {
-            while (node.kind === 191 && ts.nodeIsSynthesized(node)) {
+            while (node.kind === 191 /* ParenthesizedExpression */ && ts.nodeIsSynthesized(node)) {
                 node = node.expression;
             }
             return node;
@@ -62451,7 +79854,7 @@ var ts;
             else if (ts.isIdentifier(node) && (ts.nodeIsSynthesized(node) || !node.parent || !currentSourceFile || (node.parent && currentSourceFile && ts.getSourceFileOfNode(node) !== ts.getOriginalNode(currentSourceFile)))) {
                 return ts.idText(node);
             }
-            else if (node.kind === 9 && node.textSourceNode) {
+            else if (node.kind === 9 /* StringLiteral */ && node.textSourceNode) {
                 return getTextOfNode(node.textSourceNode, includeTrivia);
             }
             else if (ts.isLiteralExpression(node) && (ts.nodeIsSynthesized(node) || !node.parent)) {
@@ -62460,10 +79863,10 @@ var ts;
             return ts.getSourceTextOfNodeFromSourceFile(currentSourceFile, node, includeTrivia);
         }
         function getLiteralTextOfNode(node) {
-            if (node.kind === 9 && node.textSourceNode) {
+            if (node.kind === 9 /* StringLiteral */ && node.textSourceNode) {
                 var textSourceNode = node.textSourceNode;
                 if (ts.isIdentifier(textSourceNode)) {
-                    return ts.getEmitFlags(node) & 16777216 ?
+                    return ts.getEmitFlags(node) & 16777216 /* NoAsciiEscaping */ ?
                         "\"" + ts.escapeString(getTextOfNode(textSourceNode)) + "\"" :
                         "\"" + ts.escapeNonAsciiString(getTextOfNode(textSourceNode)) + "\"";
                 }
@@ -62473,16 +79876,22 @@ var ts;
             }
             return ts.getLiteralText(node, currentSourceFile);
         }
+        /**
+         * Push a new name generation scope.
+         */
         function pushNameGenerationScope(node) {
-            if (node && ts.getEmitFlags(node) & 524288) {
+            if (node && ts.getEmitFlags(node) & 524288 /* ReuseTempVariableScope */) {
                 return;
             }
             tempFlagsStack.push(tempFlags);
             tempFlags = 0;
             reservedNamesStack.push(reservedNames);
         }
+        /**
+         * Pop the current name generation scope.
+         */
         function popNameGenerationScope(node) {
-            if (node && ts.getEmitFlags(node) & 524288) {
+            if (node && ts.getEmitFlags(node) & 524288 /* ReuseTempVariableScope */) {
                 return;
             }
             tempFlags = tempFlagsStack.pop();
@@ -62498,81 +79907,81 @@ var ts;
             if (!node)
                 return;
             switch (node.kind) {
-                case 213:
+                case 213 /* Block */:
                     ts.forEach(node.statements, generateNames);
                     break;
-                case 228:
-                case 226:
-                case 218:
-                case 219:
+                case 228 /* LabeledStatement */:
+                case 226 /* WithStatement */:
+                case 218 /* DoStatement */:
+                case 219 /* WhileStatement */:
                     generateNames(node.statement);
                     break;
-                case 217:
+                case 217 /* IfStatement */:
                     generateNames(node.thenStatement);
                     generateNames(node.elseStatement);
                     break;
-                case 220:
-                case 222:
-                case 221:
+                case 220 /* ForStatement */:
+                case 222 /* ForOfStatement */:
+                case 221 /* ForInStatement */:
                     generateNames(node.initializer);
                     generateNames(node.statement);
                     break;
-                case 227:
+                case 227 /* SwitchStatement */:
                     generateNames(node.caseBlock);
                     break;
-                case 241:
+                case 241 /* CaseBlock */:
                     ts.forEach(node.clauses, generateNames);
                     break;
-                case 266:
-                case 267:
+                case 266 /* CaseClause */:
+                case 267 /* DefaultClause */:
                     ts.forEach(node.statements, generateNames);
                     break;
-                case 230:
+                case 230 /* TryStatement */:
                     generateNames(node.tryBlock);
                     generateNames(node.catchClause);
                     generateNames(node.finallyBlock);
                     break;
-                case 269:
+                case 269 /* CatchClause */:
                     generateNames(node.variableDeclaration);
                     generateNames(node.block);
                     break;
-                case 214:
+                case 214 /* VariableStatement */:
                     generateNames(node.declarationList);
                     break;
-                case 233:
+                case 233 /* VariableDeclarationList */:
                     ts.forEach(node.declarations, generateNames);
                     break;
-                case 232:
-                case 149:
-                case 182:
-                case 235:
+                case 232 /* VariableDeclaration */:
+                case 149 /* Parameter */:
+                case 182 /* BindingElement */:
+                case 235 /* ClassDeclaration */:
                     generateNameIfNeeded(node.name);
                     break;
-                case 234:
+                case 234 /* FunctionDeclaration */:
                     generateNameIfNeeded(node.name);
-                    if (ts.getEmitFlags(node) & 524288) {
+                    if (ts.getEmitFlags(node) & 524288 /* ReuseTempVariableScope */) {
                         ts.forEach(node.parameters, generateNames);
                         generateNames(node.body);
                     }
                     break;
-                case 180:
-                case 181:
+                case 180 /* ObjectBindingPattern */:
+                case 181 /* ArrayBindingPattern */:
                     ts.forEach(node.elements, generateNames);
                     break;
-                case 244:
+                case 244 /* ImportDeclaration */:
                     generateNames(node.importClause);
                     break;
-                case 245:
+                case 245 /* ImportClause */:
                     generateNameIfNeeded(node.name);
                     generateNames(node.namedBindings);
                     break;
-                case 246:
+                case 246 /* NamespaceImport */:
                     generateNameIfNeeded(node.name);
                     break;
-                case 247:
+                case 247 /* NamedImports */:
                     ts.forEach(node.elements, generateNames);
                     break;
-                case 248:
+                case 248 /* ImportSpecifier */:
                     generateNameIfNeeded(node.propertyName || node.name);
                     break;
             }
@@ -62581,12 +79990,12 @@ var ts;
             if (!node)
                 return;
             switch (node.kind) {
-                case 270:
-                case 271:
-                case 152:
-                case 154:
-                case 156:
-                case 157:
+                case 270 /* PropertyAssignment */:
+                case 271 /* ShorthandPropertyAssignment */:
+                case 152 /* PropertyDeclaration */:
+                case 154 /* MethodDeclaration */:
+                case 156 /* GetAccessor */:
+                case 157 /* SetAccessor */:
                     generateNameIfNeeded(node.name);
                     break;
             }
@@ -62601,11 +80010,18 @@ var ts;
                 }
             }
         }
+        /**
+         * Generate the text for a generated identifier.
+         */
         function generateName(name) {
-            if ((name.autoGenerateFlags & 7) === 4) {
+            if ((name.autoGenerateFlags & 7 /* KindMask */) === 4 /* Node */) {
+                // Node names generate unique names based on their original node
+                // and are cached based on that node's id.
                 return generateNameCached(getNodeForGeneratedName(name), name.autoGenerateFlags);
             }
             else {
+                // Auto, Loop, and Unique names are cached based on their unique
+                // autoGenerateId.
                 var autoGenerateId = name.autoGenerateId;
                 return autoGeneratedIdToGeneratedName[autoGenerateId] || (autoGeneratedIdToGeneratedName[autoGenerateId] = makeName(name));
             }
@@ -62614,28 +80030,44 @@ var ts;
             var nodeId = ts.getNodeId(node);
             return nodeIdToGeneratedName[nodeId] || (nodeIdToGeneratedName[nodeId] = generateNameForNode(node, flags));
         }
+        /**
+         * Returns a value indicating whether a name is unique globally, within the current file,
+         * or within the NameGenerator.
+         */
         function isUniqueName(name) {
             return isFileLevelUniqueName(name)
                 && !generatedNames.has(name)
                 && !(reservedNames && reservedNames.has(name));
         }
+        /**
+         * Returns a value indicating whether a name is unique globally or within the current file.
+         */
         function isFileLevelUniqueName(name) {
             return currentSourceFile ? ts.isFileLevelUniqueName(currentSourceFile, name, hasGlobalName) : true;
         }
+        /**
+         * Returns a value indicating whether a name is unique within a container.
+         */
         function isUniqueLocalName(name, container) {
             for (var node = container; ts.isNodeDescendantOf(node, container); node = node.nextContainer) {
                 if (node.locals) {
                     var local = node.locals.get(ts.escapeLeadingUnderscores(name));
-                    if (local && local.flags & (67216319 | 1048576 | 2097152)) {
+                    // We conservatively include alias symbols to cover cases where they're emitted as locals
+                    if (local && local.flags & (67216319 /* Value */ | 1048576 /* ExportValue */ | 2097152 /* Alias */)) {
                         return false;
                     }
                 }
             }
             return true;
         }
+        /**
+         * Return the next available name in the pattern _a ... _z, _0, _1, ...
+         * TempFlags._i or TempFlags._n may be used to express a preference for that dedicated name.
+         * Note that names generated by makeTempVariableName and makeUniqueName will never conflict.
+         */
         function makeTempVariableName(flags, reservedInNestedScopes) {
             if (flags && !(tempFlags & flags)) {
-                var name = flags === 268435456 ? "_i" : "_n";
+                var name = flags === 268435456 /* _i */ ? "_i" : "_n";
                 if (isUniqueName(name)) {
                     tempFlags |= flags;
                     if (reservedInNestedScopes) {
@@ -62645,11 +80077,12 @@ var ts;
                 }
             }
             while (true) {
-                var count = tempFlags & 268435455;
+                var count = tempFlags & 268435455 /* CountMask */;
                 tempFlags++;
+                // Skip over 'i' and 'n'
                 if (count !== 8 && count !== 13) {
                     var name = count < 26
-                        ? "_" + String.fromCharCode(97 + count)
+                        ? "_" + String.fromCharCode(97 /* a */ + count)
                         : "_" + (count - 26);
                     if (isUniqueName(name)) {
                         if (reservedInNestedScopes) {
@@ -62660,6 +80093,13 @@ var ts;
                 }
             }
         }
+        /**
+         * Generate a name that is unique within the current file and doesn't conflict with any names
+         * in global scope. The name is formed by adding an '_n' suffix to the specified base name,
+         * where n is a positive integer. Note that names generated by makeTempVariableName and
+         * makeUniqueName are guaranteed to never conflict.
+         * If `optimistic` is set, the first instance will use 'baseName' verbatim instead of 'baseName_1'
+         */
         function makeUniqueName(baseName, checkFn, optimistic, scoped) {
             if (checkFn === void 0) { checkFn = isUniqueName; }
             if (optimistic) {
@@ -62673,7 +80113,8 @@ var ts;
                     return baseName;
                 }
             }
-            if (baseName.charCodeAt(baseName.length - 1) !== 95) {
+            // Find the first unique 'name_n', where n is a positive number
+            if (baseName.charCodeAt(baseName.length - 1) !== 95 /* _ */) {
                 baseName += "_";
             }
             var i = 1;
@@ -62692,21 +80133,34 @@ var ts;
             }
         }
         function makeFileLevelOptmiisticUniqueName(name) {
-            return makeUniqueName(name, isFileLevelUniqueName, true);
+            return makeUniqueName(name, isFileLevelUniqueName, /*optimistic*/ true);
         }
+        /**
+         * Generates a unique name for a ModuleDeclaration or EnumDeclaration.
+         */
         function generateNameForModuleOrEnum(node) {
             var name = getTextOfNode(node.name);
+            // Use module/enum name itself if it is unique, otherwise make a unique variation
             return isUniqueLocalName(name, node) ? name : makeUniqueName(name);
         }
+        /**
+         * Generates a unique name for an ImportDeclaration or ExportDeclaration.
+         */
         function generateNameForImportOrExportDeclaration(node) {
-            var expr = ts.getExternalModuleName(node);
+            var expr = ts.getExternalModuleName(node); // TODO: GH#18217
             var baseName = ts.isStringLiteral(expr) ?
                 ts.makeIdentifierFromModuleName(expr.text) : "module";
             return makeUniqueName(baseName);
         }
+        /**
+         * Generates a unique name for a default export.
+         */
         function generateNameForExportDefault() {
             return makeUniqueName("default");
         }
+        /**
+         * Generates a unique name for a class expression.
+         */
         function generateNameForClassExpression() {
             return makeUniqueName("class");
         }
@@ -62714,75 +80168,95 @@ var ts;
             if (ts.isIdentifier(node.name)) {
                 return generateNameCached(node.name);
             }
-            return makeTempVariableName(0);
+            return makeTempVariableName(0 /* Auto */);
         }
+        /**
+         * Generates a unique name from a node.
+         */
         function generateNameForNode(node, flags) {
             switch (node.kind) {
-                case 71:
-                    return makeUniqueName(getTextOfNode(node), isUniqueName, !!(flags & 16), !!(flags & 8));
-                case 239:
-                case 238:
+                case 71 /* Identifier */:
+                    return makeUniqueName(getTextOfNode(node), isUniqueName, !!(flags & 16 /* Optimistic */), !!(flags & 8 /* ReservedInNestedScopes */));
+                case 239 /* ModuleDeclaration */:
+                case 238 /* EnumDeclaration */:
                     return generateNameForModuleOrEnum(node);
-                case 244:
-                case 250:
+                case 244 /* ImportDeclaration */:
+                case 250 /* ExportDeclaration */:
                     return generateNameForImportOrExportDeclaration(node);
-                case 234:
-                case 235:
-                case 249:
+                case 234 /* FunctionDeclaration */:
+                case 235 /* ClassDeclaration */:
+                case 249 /* ExportAssignment */:
                     return generateNameForExportDefault();
-                case 205:
+                case 205 /* ClassExpression */:
                     return generateNameForClassExpression();
-                case 154:
-                case 156:
-                case 157:
+                case 154 /* MethodDeclaration */:
+                case 156 /* GetAccessor */:
+                case 157 /* SetAccessor */:
                     return generateNameForMethodOrAccessor(node);
                 default:
-                    return makeTempVariableName(0);
+                    return makeTempVariableName(0 /* Auto */);
             }
         }
+        /**
+         * Generates a unique identifier for a node.
+         */
         function makeName(name) {
-            switch (name.autoGenerateFlags & 7) {
-                case 1:
-                    return makeTempVariableName(0, !!(name.autoGenerateFlags & 8));
-                case 2:
-                    return makeTempVariableName(268435456, !!(name.autoGenerateFlags & 8));
-                case 3:
-                    return makeUniqueName(ts.idText(name), (name.autoGenerateFlags & 32) ? isFileLevelUniqueName : isUniqueName, !!(name.autoGenerateFlags & 16), !!(name.autoGenerateFlags & 8));
+            switch (name.autoGenerateFlags & 7 /* KindMask */) {
+                case 1 /* Auto */:
+                    return makeTempVariableName(0 /* Auto */, !!(name.autoGenerateFlags & 8 /* ReservedInNestedScopes */));
+                case 2 /* Loop */:
+                    return makeTempVariableName(268435456 /* _i */, !!(name.autoGenerateFlags & 8 /* ReservedInNestedScopes */));
+                case 3 /* Unique */:
+                    return makeUniqueName(ts.idText(name), (name.autoGenerateFlags & 32 /* FileLevel */) ? isFileLevelUniqueName : isUniqueName, !!(name.autoGenerateFlags & 16 /* Optimistic */), !!(name.autoGenerateFlags & 8 /* ReservedInNestedScopes */));
             }
             return ts.Debug.fail("Unsupported GeneratedIdentifierKind.");
         }
+        /**
+         * Gets the node from which a name should be generated.
+         */
         function getNodeForGeneratedName(name) {
             var autoGenerateId = name.autoGenerateId;
             var node = name;
             var original = node.original;
             while (original) {
                 node = original;
+                // if "node" is a different generated name (having a different
+                // "autoGenerateId"), use it and stop traversing.
                 if (ts.isIdentifier(node)
-                    && !!(node.autoGenerateFlags & 4)
+                    && !!(node.autoGenerateFlags & 4 /* Node */)
                     && node.autoGenerateId !== autoGenerateId) {
                     break;
                 }
                 original = node.original;
             }
+            // otherwise, return the original node for the source;
             return node;
         }
     }
     ts.createPrinter = createPrinter;
     function createBracketsMap() {
         var brackets = [];
-        brackets[512] = ["{", "}"];
-        brackets[1024] = ["(", ")"];
-        brackets[2048] = ["<", ">"];
-        brackets[4096] = ["[", "]"];
+        brackets[512 /* Braces */] = ["{", "}"];
+        brackets[1024 /* Parenthesis */] = ["(", ")"];
+        brackets[2048 /* AngleBrackets */] = ["<", ">"];
+        brackets[4096 /* SquareBrackets */] = ["[", "]"];
         return brackets;
     }
     function getOpeningBracket(format) {
-        return brackets[format & 7680][0];
+        return brackets[format & 7680 /* BracketsMask */][0];
     }
     function getClosingBracket(format) {
-        return brackets[format & 7680][1];
+        return brackets[format & 7680 /* BracketsMask */][1];
     }
+    // Flags enum to track count of temp variables and a few dedicated names
+    var TempFlags;
+    (function (TempFlags) {
+        TempFlags[TempFlags["Auto"] = 0] = "Auto";
+        TempFlags[TempFlags["CountMask"] = 268435455] = "CountMask";
+        TempFlags[TempFlags["_i"] = 268435456] = "_i";
+    })(TempFlags || (TempFlags = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     function createCachedDirectoryStructureHost(host, currentDirectory, useCaseSensitiveFileNames) {
@@ -62818,12 +80292,17 @@ var ts;
         }
         function createCachedFileSystemEntries(rootDir, rootDirPath) {
             var resultFromHost = {
-                files: ts.map(host.readDirectory(rootDir, undefined, undefined, ["*.*"]), getBaseNameOfFileName) || [],
+                files: ts.map(host.readDirectory(rootDir, /*extensions*/ undefined, /*exclude*/ undefined, /*include*/ ["*.*"]), getBaseNameOfFileName) || [],
                 directories: host.getDirectories(rootDir) || []
             };
             cachedReadDirectoryResult.set(ts.ensureTrailingDirectorySeparator(rootDirPath), resultFromHost);
             return resultFromHost;
         }
+        /**
+         * If the readDirectory result was already cached, it returns that
+         * Otherwise gets result from host and caches it.
+         * The host request is done under try catch block to avoid caching incorrect result
+         */
         function tryReadDirectory(rootDir, rootDirPath) {
             rootDirPath = ts.ensureTrailingDirectorySeparator(rootDirPath);
             var cachedResult = getCachedFileSystemEntries(rootDirPath);
@@ -62834,6 +80313,7 @@ var ts;
                 return createCachedFileSystemEntries(rootDir, rootDirPath);
             }
             catch (_e) {
+                // If there is exception to read directories, dont cache the result and direct the calls to host
                 ts.Debug.assert(!cachedReadDirectoryResult.has(ts.ensureTrailingDirectorySeparator(rootDirPath)));
                 return undefined;
             }
@@ -62858,7 +80338,7 @@ var ts;
             var path = toPath(fileName);
             var result = getCachedFileSystemEntriesForBaseDir(path);
             if (result) {
-                updateFilesOfFileSystemEntry(result, getBaseNameOfFileName(fileName), true);
+                updateFilesOfFileSystemEntry(result, getBaseNameOfFileName(fileName), /*fileExists*/ true);
             }
             return host.writeFile(fileName, data, writeByteOrderMark);
         }
@@ -62877,7 +80357,7 @@ var ts;
             var result = getCachedFileSystemEntriesForBaseDir(path);
             var baseFileName = getBaseNameOfFileName(dirPath);
             if (result) {
-                updateFileSystemEntry(result.directories, baseFileName, true);
+                updateFileSystemEntry(result.directories, baseFileName, /*isValid*/ true);
             }
             host.createDirectory(dirPath);
         }
@@ -62907,6 +80387,8 @@ var ts;
         function addOrDeleteFileOrDirectory(fileOrDirectory, fileOrDirectoryPath) {
             var existingResult = getCachedFileSystemEntries(fileOrDirectoryPath);
             if (existingResult) {
+                // Just clear the cache for now
+                // For now just clear the cache, since this could mean that multiple level entries might need to be re-evaluated
                 clearCache();
                 return undefined;
             }
@@ -62914,7 +80396,10 @@ var ts;
             if (!parentResult) {
                 return undefined;
             }
+            // This was earlier a file (hence not in cached directory contents)
+            // or we never cached the directory containing it
             if (!host.directoryExists) {
+                // Since host doesnt support directory exists, clear the cache as otherwise it might not be same
                 clearCache();
                 return undefined;
             }
@@ -62924,9 +80409,11 @@ var ts;
                 directoryExists: host.directoryExists(fileOrDirectoryPath)
             };
             if (fsQueryResult.directoryExists || hasEntry(parentResult.directories, baseName)) {
+                // Folder added or removed, clear the cache instead of updating the folder and its structure
                 clearCache();
             }
             else {
+                // No need to update the directory structure, just files
                 updateFilesOfFileSystemEntry(parentResult, baseName, fsQueryResult.fileExists);
             }
             return fsQueryResult;
@@ -62951,31 +80438,51 @@ var ts;
     var ConfigFileProgramReloadLevel;
     (function (ConfigFileProgramReloadLevel) {
         ConfigFileProgramReloadLevel[ConfigFileProgramReloadLevel["None"] = 0] = "None";
+        /** Update the file name list from the disk */
         ConfigFileProgramReloadLevel[ConfigFileProgramReloadLevel["Partial"] = 1] = "Partial";
+        /** Reload completely by re-reading contents of config file from disk and updating program */
         ConfigFileProgramReloadLevel[ConfigFileProgramReloadLevel["Full"] = 2] = "Full";
     })(ConfigFileProgramReloadLevel = ts.ConfigFileProgramReloadLevel || (ts.ConfigFileProgramReloadLevel = {}));
+    /**
+     * Updates the existing missing file watches with the new set of missing files after new program is created
+     */
     function updateMissingFilePathsWatch(program, missingFileWatches, createMissingFileWatch) {
         var missingFilePaths = program.getMissingFilePaths();
         var newMissingFilePathMap = ts.arrayToSet(missingFilePaths);
+        // Update the missing file paths watcher
         ts.mutateMap(missingFileWatches, newMissingFilePathMap, {
+            // Watch the missing files
             createNewValue: createMissingFileWatch,
+            // Files that are no longer missing (e.g. because they are no longer required)
+            // should no longer be watched.
             onDeleteValue: ts.closeFileWatcher
         });
     }
     ts.updateMissingFilePathsWatch = updateMissingFilePathsWatch;
+    /**
+     * Updates the existing wild card directory watches with the new set of wild card directories from the config file
+     * after new program is created because the config file was reloaded or program was created first time from the config file
+     * Note that there is no need to call this function when the program is updated with additional files without reloading config files,
+     * as wildcard directories wont change unless reloading config file
+     */
     function updateWatchingWildcardDirectories(existingWatchedForWildcards, wildcardDirectories, watchDirectory) {
         ts.mutateMap(existingWatchedForWildcards, wildcardDirectories, {
+            // Create new watch and recursive info
             createNewValue: createWildcardDirectoryWatcher,
+            // Close existing watch thats not needed any more
             onDeleteValue: closeFileWatcherOf,
+            // Close existing watch that doesnt match in the flags
             onExistingValue: updateWildcardDirectoryWatcher
         });
         function createWildcardDirectoryWatcher(directory, flags) {
+            // Create new watch and recursive info
             return {
                 watcher: watchDirectory(directory, flags),
                 flags: flags
             };
         }
         function updateWildcardDirectoryWatcher(existingWatcher, flags, directory) {
+            // Watcher needs to be updated if the recursive flags dont match
             if (existingWatcher.flags === flags) {
                 return;
             }
@@ -63007,13 +80514,13 @@ var ts;
         var createDirectoryWatcher = getCreateFileWatcher(watchLogLevel, watchDirectory);
         return {
             watchFile: function (host, file, callback, pollingInterval, detailInfo1, detailInfo2) {
-                return createFileWatcher(host, file, callback, pollingInterval, undefined, detailInfo1, detailInfo2, watchFile, log, "FileWatcher", getDetailWatchInfo);
+                return createFileWatcher(host, file, callback, pollingInterval, /*passThrough*/ undefined, detailInfo1, detailInfo2, watchFile, log, "FileWatcher", getDetailWatchInfo);
             },
             watchFilePath: function (host, file, callback, pollingInterval, path, detailInfo1, detailInfo2) {
                 return createFilePathWatcher(host, file, callback, pollingInterval, path, detailInfo1, detailInfo2, watchFile, log, "FileWatcher", getDetailWatchInfo);
             },
             watchDirectory: function (host, directory, callback, flags, detailInfo1, detailInfo2) {
-                return createDirectoryWatcher(host, directory, callback, flags, undefined, detailInfo1, detailInfo2, watchDirectory, log, "DirectoryWatcher", getDetailWatchInfo);
+                return createDirectoryWatcher(host, directory, callback, flags, /*passThrough*/ undefined, detailInfo1, detailInfo2, watchDirectory, log, "DirectoryWatcher", getDetailWatchInfo);
             }
         };
         function watchFilePath(host, file, callback, pollingInterval, path) {
@@ -63024,7 +80531,7 @@ var ts;
         return host.watchFile(file, callback, pollingInterval);
     }
     function watchDirectory(host, directory, callback, flags) {
-        return host.watchDirectory(directory, callback, (flags & 1) !== 0);
+        return host.watchDirectory(directory, callback, (flags & 1 /* Recursive */) !== 0);
     }
     function getCreateFileWatcher(watchLogLevel, addWatch) {
         switch (watchLogLevel) {
@@ -63081,12 +80588,15 @@ var ts;
         return ts.normalizePath(referencedFileName);
     }
     ts.resolveTripleslashReference = resolveTripleslashReference;
+    /* @internal */
     function computeCommonSourceDirectoryOfFilenames(fileNames, currentDirectory, getCanonicalFileName) {
         var commonPathComponents;
         var failed = ts.forEach(fileNames, function (sourceFile) {
+            // Each file contributes into common source file path
             var sourcePathComponents = ts.getNormalizedPathComponents(sourceFile, currentDirectory);
-            sourcePathComponents.pop();
+            sourcePathComponents.pop(); // The base file name is not part of the common directory path
             if (!commonPathComponents) {
+                // first file
                 commonPathComponents = sourcePathComponents;
                 return;
             }
@@ -63094,20 +80604,24 @@ var ts;
             for (var i = 0; i < n; i++) {
                 if (getCanonicalFileName(commonPathComponents[i]) !== getCanonicalFileName(sourcePathComponents[i])) {
                     if (i === 0) {
+                        // Failed to find any common path component
                         return true;
                     }
+                    // New common path found that is 0 -> i-1
                     commonPathComponents.length = i;
                     break;
                 }
             }
+            // If the sourcePathComponents was shorter than the commonPathComponents, truncate to the sourcePathComponents
             if (sourcePathComponents.length < commonPathComponents.length) {
                 commonPathComponents.length = sourcePathComponents.length;
             }
         });
+        // A common path can not be found when paths span multiple drives on windows, for example
         if (failed) {
             return "";
         }
-        if (!commonPathComponents) {
+        if (!commonPathComponents) { // Can happen when all input files are .d.ts files
             return currentDirectory;
         }
         return ts.getPathFromPathComponents(commonPathComponents);
@@ -63116,6 +80630,8 @@ var ts;
     function createCompilerHost(options, setParentNodes) {
         var existingDirectories = ts.createMap();
         function getCanonicalFileName(fileName) {
+            // if underlying system can distinguish between two files whose names differs only in cases then file name already in canonical form.
+            // otherwise use toLowerCase as a canonical form.
             return ts.sys.useCaseSensitiveFileNames ? fileName : fileName.toLowerCase();
         }
         function getSourceFile(fileName, languageVersion, onError) {
@@ -63156,10 +80672,11 @@ var ts;
             if (!outputFingerprints) {
                 outputFingerprints = ts.createMap();
             }
-            var hash = ts.sys.createHash(data);
-            var mtimeBefore = ts.sys.getModifiedTime(fileName);
+            var hash = ts.sys.createHash(data); // TODO: GH#18217
+            var mtimeBefore = ts.sys.getModifiedTime(fileName); // TODO: GH#18217
             if (mtimeBefore) {
                 var fingerprint = outputFingerprints.get(fileName);
+                // If output has not been changed, and the file has no external modification
                 if (fingerprint &&
                     fingerprint.byteOrderMark === writeByteOrderMark &&
                     fingerprint.hash === hash &&
@@ -63168,7 +80685,7 @@ var ts;
                 }
             }
             ts.sys.writeFile(fileName, data, writeByteOrderMark);
-            var mtimeAfter = ts.sys.getModifiedTime(fileName);
+            var mtimeAfter = ts.sys.getModifiedTime(fileName); // TODO: GH#18217
             outputFingerprints.set(fileName, {
                 hash: hash,
                 byteOrderMark: writeByteOrderMark,
@@ -63215,7 +80732,10 @@ var ts;
             getEnvironmentVariable: function (name) { return ts.sys.getEnvironmentVariable ? ts.sys.getEnvironmentVariable(name) : ""; },
             getDirectories: function (path) { return ts.sys.getDirectories(path); },
             realpath: realpath,
-            readDirectory: function (path, extensions, include, exclude, depth) { return ts.sys.readDirectory(path, extensions, include, exclude, depth); }
+            readDirectory: function (path, extensions, include, exclude, depth) { return ts.sys.readDirectory(path, extensions, include, exclude, depth); },
+            getModifiedTime: ts.sys.getModifiedTime && (function (path) { return ts.sys.getModifiedTime(path); }),
+            setModifiedTime: ts.sys.setModifiedTime && (function (path, date) { return ts.sys.setModifiedTime(path, date); }),
+            deleteFile: ts.sys.deleteFile && (function (path) { return ts.sys.deleteFile(path); })
         };
     }
     ts.createCompilerHost = createCompilerHost;
@@ -63239,7 +80759,7 @@ var ts;
     function formatDiagnostic(diagnostic, host) {
         var errorMessage = ts.diagnosticCategoryName(diagnostic) + " TS" + diagnostic.code + ": " + flattenDiagnosticMessageText(diagnostic.messageText, host.getNewLine()) + host.getNewLine();
         if (diagnostic.file) {
-            var _a = ts.getLineAndCharacterOfPosition(diagnostic.file, diagnostic.start), line = _a.line, character = _a.character;
+            var _a = ts.getLineAndCharacterOfPosition(diagnostic.file, diagnostic.start), line = _a.line, character = _a.character; // TODO: GH#18217
             var fileName = diagnostic.file.fileName;
             var relativeFileName = ts.convertToRelativePath(fileName, host.getCurrentDirectory(), function (fileName) { return host.getCanonicalFileName(fileName); });
             return relativeFileName + "(" + (line + 1) + "," + (character + 1) + "): " + errorMessage;
@@ -63247,6 +80767,7 @@ var ts;
         return errorMessage;
     }
     ts.formatDiagnostic = formatDiagnostic;
+    /** @internal */
     var ForegroundColorEscapeSequences;
     (function (ForegroundColorEscapeSequences) {
         ForegroundColorEscapeSequences["Grey"] = "\u001B[90m";
@@ -63267,6 +80788,7 @@ var ts;
             case ts.DiagnosticCategory.Message: return ForegroundColorEscapeSequences.Blue;
         }
     }
+    /** @internal */
     function formatColorAndReset(text, formatStyle) {
         return formatStyle + text + resetEscapeSequence;
     }
@@ -63281,45 +80803,52 @@ var ts;
         var output = "";
         for (var _i = 0, diagnostics_2 = diagnostics; _i < diagnostics_2.length; _i++) {
             var diagnostic = diagnostics_2[_i];
-            var context_2 = "";
+            var context = "";
             if (diagnostic.file) {
-                var start = diagnostic.start, length_4 = diagnostic.length, file_9 = diagnostic.file;
-                var _a = ts.getLineAndCharacterOfPosition(file_9, start), firstLine = _a.line, firstLineChar = _a.character;
-                var _b = ts.getLineAndCharacterOfPosition(file_9, start + length_4), lastLine = _b.line, lastLineChar = _b.character;
-                var lastLineInFile = ts.getLineAndCharacterOfPosition(file_9, file_9.text.length).line;
-                var relativeFileName = host ? ts.convertToRelativePath(file_9.fileName, host.getCurrentDirectory(), function (fileName) { return host.getCanonicalFileName(fileName); }) : file_9.fileName;
+                var start = diagnostic.start, length_4 = diagnostic.length, file = diagnostic.file;
+                var _a = ts.getLineAndCharacterOfPosition(file, start), firstLine = _a.line, firstLineChar = _a.character; // TODO: GH#18217
+                var _b = ts.getLineAndCharacterOfPosition(file, start + length_4), lastLine = _b.line, lastLineChar = _b.character;
+                var lastLineInFile = ts.getLineAndCharacterOfPosition(file, file.text.length).line;
+                var relativeFileName = host ? ts.convertToRelativePath(file.fileName, host.getCurrentDirectory(), function (fileName) { return host.getCanonicalFileName(fileName); }) : file.fileName;
                 var hasMoreThanFiveLines = (lastLine - firstLine) >= 4;
                 var gutterWidth = (lastLine + 1 + "").length;
                 if (hasMoreThanFiveLines) {
                     gutterWidth = Math.max(ellipsis.length, gutterWidth);
                 }
                 for (var i = firstLine; i <= lastLine; i++) {
-                    context_2 += host.getNewLine();
+                    context += host.getNewLine();
+                    // If the error spans over 5 lines, we'll only show the first 2 and last 2 lines,
+                    // so we'll skip ahead to the second-to-last line.
                     if (hasMoreThanFiveLines && firstLine + 1 < i && i < lastLine - 1) {
-                        context_2 += formatColorAndReset(padLeft(ellipsis, gutterWidth), gutterStyleSequence) + gutterSeparator + host.getNewLine();
+                        context += formatColorAndReset(padLeft(ellipsis, gutterWidth), gutterStyleSequence) + gutterSeparator + host.getNewLine();
                         i = lastLine - 1;
                     }
-                    var lineStart = ts.getPositionOfLineAndCharacter(file_9, i, 0);
-                    var lineEnd = i < lastLineInFile ? ts.getPositionOfLineAndCharacter(file_9, i + 1, 0) : file_9.text.length;
-                    var lineContent = file_9.text.slice(lineStart, lineEnd);
-                    lineContent = lineContent.replace(/\s+$/g, "");
-                    lineContent = lineContent.replace("\t", " ");
-                    context_2 += formatColorAndReset(padLeft(i + 1 + "", gutterWidth), gutterStyleSequence) + gutterSeparator;
-                    context_2 += lineContent + host.getNewLine();
-                    context_2 += formatColorAndReset(padLeft("", gutterWidth), gutterStyleSequence) + gutterSeparator;
-                    context_2 += ForegroundColorEscapeSequences.Red;
+                    var lineStart = ts.getPositionOfLineAndCharacter(file, i, 0);
+                    var lineEnd = i < lastLineInFile ? ts.getPositionOfLineAndCharacter(file, i + 1, 0) : file.text.length;
+                    var lineContent = file.text.slice(lineStart, lineEnd);
+                    lineContent = lineContent.replace(/\s+$/g, ""); // trim from end
+                    lineContent = lineContent.replace("\t", " "); // convert tabs to single spaces
+                    // Output the gutter and the actual contents of the line.
+                    context += formatColorAndReset(padLeft(i + 1 + "", gutterWidth), gutterStyleSequence) + gutterSeparator;
+                    context += lineContent + host.getNewLine();
+                    // Output the gutter and the error span for the line using tildes.
+                    context += formatColorAndReset(padLeft("", gutterWidth), gutterStyleSequence) + gutterSeparator;
+                    context += ForegroundColorEscapeSequences.Red;
                     if (i === firstLine) {
+                        // If we're on the last line, then limit it to the last character of the last line.
+                        // Otherwise, we'll just squiggle the rest of the line, giving 'slice' no end position.
                         var lastCharForLine = i === lastLine ? lastLineChar : undefined;
-                        context_2 += lineContent.slice(0, firstLineChar).replace(/\S/g, " ");
-                        context_2 += lineContent.slice(firstLineChar, lastCharForLine).replace(/./g, "~");
+                        context += lineContent.slice(0, firstLineChar).replace(/\S/g, " ");
+                        context += lineContent.slice(firstLineChar, lastCharForLine).replace(/./g, "~");
                     }
                     else if (i === lastLine) {
-                        context_2 += lineContent.slice(0, lastLineChar).replace(/./g, "~");
+                        context += lineContent.slice(0, lastLineChar).replace(/./g, "~");
                     }
                     else {
-                        context_2 += lineContent.replace(/./g, "~");
+                        // Squiggle the entire line.
+                        context += lineContent.replace(/./g, "~");
                     }
-                    context_2 += resetEscapeSequence;
+                    context += resetEscapeSequence;
                 }
                 output += formatColorAndReset(relativeFileName, ForegroundColorEscapeSequences.Cyan);
                 output += ":";
@@ -63333,11 +80862,11 @@ var ts;
             output += flattenDiagnosticMessageText(diagnostic.messageText, host.getNewLine());
             if (diagnostic.file) {
                 output += host.getNewLine();
-                output += context_2;
+                output += context;
             }
             output += host.getNewLine();
         }
-        return output + host.getNewLine();
+        return output;
     }
     ts.formatDiagnosticsWithColorAndContext = formatDiagnosticsWithColorAndContext;
     function flattenDiagnosticMessageText(messageText, newLine) {
@@ -63382,23 +80911,34 @@ var ts;
         }
         return resolutions;
     }
+    /**
+     * Determines if program structure is upto date or needs to be recreated
+     */
+    /* @internal */
     function isProgramUptoDate(program, rootFileNames, newOptions, getSourceVersion, fileExists, hasInvalidatedResolution, hasChangedAutomaticTypeDirectiveNames) {
+        // If we haven't created a program yet or have changed automatic type directives, then it is not up-to-date
         if (!program || hasChangedAutomaticTypeDirectiveNames) {
             return false;
         }
+        // If number of files in the program do not match, it is not up-to-date
         if (program.getRootFileNames().length !== rootFileNames.length) {
             return false;
         }
+        // If any file is not up-to-date, then the whole program is not up-to-date
         if (program.getSourceFiles().some(sourceFileNotUptoDate)) {
             return false;
         }
+        // If any of the missing file paths are now created
         if (program.getMissingFilePaths().some(fileExists)) {
             return false;
         }
         var currentOptions = program.getCompilerOptions();
+        // If the compilation settings do no match, then the program is not up-to-date
         if (!ts.compareDataObjects(currentOptions, newOptions)) {
             return false;
         }
+        // If everything matches but the text of config file is changed,
+        // error locations can change for program options, so update the program
         if (currentOptions.configFile && newOptions.configFile) {
             return currentOptions.configFile.text === newOptions.configFile.text;
         }
@@ -63414,7 +80954,12 @@ var ts;
             configFileParseResult.errors;
     }
     ts.getConfigFileParsingDiagnostics = getConfigFileParsingDiagnostics;
+    /**
+     * Determined if source file needs to be re-created even if its text hasn't changed
+     */
     function shouldProgramCreateNewSourceFiles(program, newOptions) {
+        // If any of these options change, we can't reuse old source file even if version match
+        // The change in options like these could result in change in syntax tree change
         var oldOptions = program && program.getCompilerOptions();
         return oldOptions && (oldOptions.target !== newOptions.target ||
             oldOptions.module !== newOptions.module ||
@@ -63436,11 +80981,13 @@ var ts;
         };
     }
     function createProgram(rootNamesOrOptions, _options, _host, _oldProgram, _configFileParsingDiagnostics) {
-        var createProgramOptions = ts.isArray(rootNamesOrOptions) ? createCreateProgramOptions(rootNamesOrOptions, _options, _host, _oldProgram, _configFileParsingDiagnostics) : rootNamesOrOptions;
+        var createProgramOptions = ts.isArray(rootNamesOrOptions) ? createCreateProgramOptions(rootNamesOrOptions, _options, _host, _oldProgram, _configFileParsingDiagnostics) : rootNamesOrOptions; // TODO: GH#18217
         var rootNames = createProgramOptions.rootNames, options = createProgramOptions.options, configFileParsingDiagnostics = createProgramOptions.configFileParsingDiagnostics, projectReferences = createProgramOptions.projectReferences;
         var oldProgram = createProgramOptions.oldProgram;
         var program;
-        var files = [];
+        var processingDefaultLibFiles;
+        var processingOtherFiles;
+        var files;
         var commonSourceDirectory;
         var diagnosticsProducingTypeChecker;
         var noDiagnosticsTypeChecker;
@@ -63450,9 +80997,19 @@ var ts;
         var cachedDeclarationDiagnosticsForFile = {};
         var resolvedTypeReferenceDirectives = ts.createMap();
         var fileProcessingDiagnostics = ts.createDiagnosticCollection();
+        // The below settings are to track if a .js file should be add to the program if loaded via searching under node_modules.
+        // This works as imported modules are discovered recursively in a depth first manner, specifically:
+        // - For each root file, findSourceFile is called.
+        // - This calls processImportedModules for each module imported in the source file.
+        // - This calls resolveModuleNames, and then calls findSourceFile for each resolved module.
+        // As all these operations happen - and are nested - within the createProgram call, they close over the below variables.
+        // The current resolution depth is tracked by incrementing/decrementing as the depth first search progresses.
         var maxNodeModuleJsDepth = typeof options.maxNodeModuleJsDepth === "number" ? options.maxNodeModuleJsDepth : 0;
         var currentNodeModulesDepth = 0;
+        // If a module has some of its imports skipped due to being at the depth limit under node_modules, then track
+        // this, as it may be imported at a shallower depth later, and then it will need its skipped imports processed.
         var modulesWithElidedImports = ts.createMap();
+        // Track source files that are source files found by searching under node_modules, as these shouldn't be compiled.
         var sourceFilesFoundSearchingNodeModules = ts.createMap();
         ts.performance.mark("beforeProgram");
         var host = createProgramOptions.host || createCompilerHost(options);
@@ -63463,6 +81020,7 @@ var ts;
         var programDiagnostics = ts.createDiagnosticCollection();
         var currentDirectory = host.getCurrentDirectory();
         var supportedExtensions = ts.getSupportedExtensions(options);
+        // Map storing if there is emit blocking diagnostics for given input
         var hasEmitBlockingDiagnostics = ts.createMap();
         var _compilerOptionsObjectLiteralSyntax;
         var _referencesArrayLiteralSyntax;
@@ -63471,6 +81029,7 @@ var ts;
         var hasInvalidatedResolution = host.hasInvalidatedResolution || ts.returnFalse;
         if (host.resolveModuleNames) {
             resolveModuleNamesWorker = function (moduleNames, containingFile, reusedNames) { return host.resolveModuleNames(ts.Debug.assertEachDefined(moduleNames), containingFile, reusedNames).map(function (resolved) {
+                // An older host may have omitted extension, in which case we should infer it from the file extension of resolvedFileName.
                 if (!resolved || resolved.extension !== undefined) {
                     return resolved;
                 }
@@ -63481,7 +81040,7 @@ var ts;
         }
         else {
             moduleResolutionCache = ts.createModuleResolutionCache(currentDirectory, function (x) { return host.getCanonicalFileName(x); });
-            var loader_1 = function (moduleName, containingFile) { return ts.resolveModuleName(moduleName, containingFile, options, host, moduleResolutionCache).resolvedModule; };
+            var loader_1 = function (moduleName, containingFile) { return ts.resolveModuleName(moduleName, containingFile, options, host, moduleResolutionCache).resolvedModule; }; // TODO: GH#18217
             resolveModuleNamesWorker = function (moduleNames, containingFile) { return loadWithLocalCache(ts.Debug.assertEachDefined(moduleNames), containingFile, loader_1); };
         }
         var resolveTypeReferenceDirectiveNamesWorker;
@@ -63489,37 +81048,48 @@ var ts;
             resolveTypeReferenceDirectiveNamesWorker = function (typeDirectiveNames, containingFile) { return host.resolveTypeReferenceDirectives(ts.Debug.assertEachDefined(typeDirectiveNames), containingFile); };
         }
         else {
-            var loader_2 = function (typesRef, containingFile) { return ts.resolveTypeReferenceDirective(typesRef, containingFile, options, host).resolvedTypeReferenceDirective; };
+            var loader_2 = function (typesRef, containingFile) { return ts.resolveTypeReferenceDirective(typesRef, containingFile, options, host).resolvedTypeReferenceDirective; }; // TODO: GH#18217
             resolveTypeReferenceDirectiveNamesWorker = function (typeReferenceDirectiveNames, containingFile) { return loadWithLocalCache(ts.Debug.assertEachDefined(typeReferenceDirectiveNames), containingFile, loader_2); };
         }
+        // Map from a stringified PackageId to the source file with that id.
+        // Only one source file may have a given packageId. Others become redirects (see createRedirectSourceFile).
+        // `packageIdToSourceFile` is only used while building the program, while `sourceFileToPackageName` and `isSourceFileTargetOfRedirect` are kept around.
         var packageIdToSourceFile = ts.createMap();
+        // Maps from a SourceFile's `.path` to the name of the package it was imported with.
         var sourceFileToPackageName = ts.createMap();
         var redirectTargetsSet = ts.createMap();
         var filesByName = ts.createMap();
         var missingFilePaths;
+        // stores 'filename -> file association' ignoring case
+        // used to track cases when two file names differ only in casing
         var filesByNameIgnoreCase = host.useCaseSensitiveFileNames() ? ts.createMap() : undefined;
+        // A parallel array to projectReferences storing the results of reading in the referenced tsconfig files
         var resolvedProjectReferences = projectReferences ? [] : undefined;
         var projectReferenceRedirects = ts.createMap();
-        if (projectReferences) {
-            for (var _i = 0, projectReferences_1 = projectReferences; _i < projectReferences_1.length; _i++) {
-                var ref = projectReferences_1[_i];
-                var parsedRef = parseProjectReferenceConfigFile(ref);
-                resolvedProjectReferences.push(parsedRef);
-                if (parsedRef) {
-                    if (parsedRef.commandLine.options.outFile) {
-                        var dtsOutfile = ts.changeExtension(parsedRef.commandLine.options.outFile, ".d.ts");
-                        processSourceFile(dtsOutfile, false, undefined);
-                    }
-                    addProjectReferenceRedirects(parsedRef.commandLine, projectReferenceRedirects);
-                }
-            }
-        }
         var shouldCreateNewSourceFile = shouldProgramCreateNewSourceFiles(oldProgram, options);
         var structuralIsReused = tryReuseStructureFromOldProgram();
-        if (structuralIsReused !== 2) {
-            ts.forEach(rootNames, function (name) { return processRootFile(name, false); });
+        if (structuralIsReused !== 2 /* Completely */) {
+            processingDefaultLibFiles = [];
+            processingOtherFiles = [];
+            if (projectReferences) {
+                for (var _i = 0, projectReferences_1 = projectReferences; _i < projectReferences_1.length; _i++) {
+                    var ref = projectReferences_1[_i];
+                    var parsedRef = parseProjectReferenceConfigFile(ref);
+                    resolvedProjectReferences.push(parsedRef);
+                    if (parsedRef) {
+                        if (parsedRef.commandLine.options.outFile) {
+                            var dtsOutfile = ts.changeExtension(parsedRef.commandLine.options.outFile, ".d.ts");
+                            processSourceFile(dtsOutfile, /*isDefaultLib*/ false, /*ignoreNoDefaultLib*/ false, /*packageId*/ undefined);
+                        }
+                        addProjectReferenceRedirects(parsedRef.commandLine, projectReferenceRedirects);
+                    }
+                }
+            }
+            ts.forEach(rootNames, function (name) { return processRootFile(name, /*isDefaultLib*/ false, /*ignoreNoDefaultLib*/ false); });
+            // load type declarations specified via 'types' argument or implicitly from types/ and node_modules/@types folders
             var typeReferences = ts.getAutomaticTypeDirectiveNames(options, host);
             if (typeReferences.length) {
+                // This containingFilename needs to match with the one used in managed-side
                 var containingDirectory = options.configFilePath ? ts.getDirectoryPath(options.configFilePath) : host.getCurrentDirectory();
                 var containingFilename = ts.combinePaths(containingDirectory, "__inferred type names__.ts");
                 var resolutions = resolveTypeReferenceDirectiveNamesWorker(typeReferences, containingFilename);
@@ -63527,20 +81097,31 @@ var ts;
                     processTypeReferenceDirective(typeReferences[i], resolutions[i]);
                 }
             }
+            // Do not process the default library if:
+            //  - The '--noLib' flag is used.
+            //  - A 'no-default-lib' reference comment is encountered in
+            //      processing the root files.
             if (!skipDefaultLib) {
+                // If '--lib' is not specified, include default library file according to '--target'
+                // otherwise, using options specified in '--lib' instead of '--target' default library file
                 var defaultLibraryFileName = getDefaultLibraryFileName();
                 if (!options.lib && defaultLibraryFileName) {
-                    processRootFile(defaultLibraryFileName, true);
+                    processRootFile(defaultLibraryFileName, /*isDefaultLib*/ true, /*ignoreNoDefaultLib*/ false);
                 }
                 else {
                     ts.forEach(options.lib, function (libFileName) {
-                        processRootFile(ts.combinePaths(defaultLibraryPath, libFileName), true);
+                        processRootFile(ts.combinePaths(defaultLibraryPath, libFileName), /*isDefaultLib*/ true, /*ignoreNoDefaultLib*/ false);
                     });
                 }
             }
             missingFilePaths = ts.arrayFrom(filesByName.keys(), function (p) { return p; }).filter(function (p) { return !filesByName.get(p); });
+            files = ts.stableSort(processingDefaultLibFiles, compareDefaultLibFiles).concat(processingOtherFiles);
+            processingDefaultLibFiles = undefined;
+            processingOtherFiles = undefined;
         }
         ts.Debug.assert(!!missingFilePaths);
+        // Release any files we have acquired in the old program but are
+        // not part of the new program.
         if (oldProgram && host.onReleaseOldSourceFile) {
             var oldSourceFiles = oldProgram.getSourceFiles();
             for (var _a = 0, oldSourceFiles_1 = oldSourceFiles; _a < oldSourceFiles_1.length; _a++) {
@@ -63550,6 +81131,7 @@ var ts;
                 }
             }
         }
+        // unconditionally set oldProgram to undefined to prevent it from being captured in closure
         oldProgram = undefined;
         program = {
             getRootFileNames: function () { return rootNames; },
@@ -63580,6 +81162,7 @@ var ts;
             isSourceFileDefaultLibrary: isSourceFileDefaultLibrary,
             dropDiagnosticsProducingTypeChecker: dropDiagnosticsProducingTypeChecker,
             getSourceFileFromReference: getSourceFileFromReference,
+            getLibFileFromReference: getLibFileFromReference,
             sourceFileToPackageName: sourceFileToPackageName,
             redirectTargetsSet: redirectTargetsSet,
             isEmittedFile: isEmittedFile,
@@ -63591,6 +81174,21 @@ var ts;
         ts.performance.mark("afterProgram");
         ts.performance.measure("Program", "beforeProgram", "afterProgram");
         return program;
+        function compareDefaultLibFiles(a, b) {
+            return ts.compareValues(getDefaultLibFilePriority(a), getDefaultLibFilePriority(b));
+        }
+        function getDefaultLibFilePriority(a) {
+            if (ts.containsPath(defaultLibraryPath, a.fileName, /*ignoreCase*/ false)) {
+                var basename = ts.getBaseFileName(a.fileName);
+                if (basename === "lib.d.ts" || basename === "lib.es6.d.ts")
+                    return 0;
+                var name = ts.removeSuffix(ts.removePrefix(basename, "lib."), ".d.ts");
+                var index = ts.libs.indexOf(name);
+                if (index !== -1)
+                    return index + 1;
+            }
+            return ts.libs.length + 2;
+        }
         function getResolvedModuleWithFailedLookupLocationsFromCache(moduleName, containingFile) {
             return moduleResolutionCache && ts.resolveModuleNameFromCache(moduleName, containingFile, moduleResolutionCache);
         }
@@ -63601,16 +81199,21 @@ var ts;
             if (commonSourceDirectory === undefined) {
                 var emittedFiles = ts.filter(files, function (file) { return ts.sourceFileMayBeEmitted(file, options, isSourceFileFromExternalLibrary); });
                 if (options.rootDir && checkSourceFilesBelongToPath(emittedFiles, options.rootDir)) {
+                    // If a rootDir is specified use it as the commonSourceDirectory
                     commonSourceDirectory = ts.getNormalizedAbsolutePath(options.rootDir, currentDirectory);
                 }
                 else if (options.composite) {
-                    commonSourceDirectory = ts.getDirectoryPath(ts.normalizeSlashes(options.configFilePath));
+                    // Project compilations never infer their root from the input source paths
+                    commonSourceDirectory = ts.getDirectoryPath(ts.normalizeSlashes(options.configFilePath)); // TODO: GH#18217
                     checkSourceFilesBelongToPath(emittedFiles, commonSourceDirectory);
                 }
                 else {
                     commonSourceDirectory = computeCommonSourceDirectory(emittedFiles);
                 }
                 if (commonSourceDirectory && commonSourceDirectory[commonSourceDirectory.length - 1] !== ts.directorySeparator) {
+                    // Make sure directory path ends with directory separator so this string can directly
+                    // used to replace with "" to get the relative path of the source file and the relative path doesn't
+                    // start with / making it rooted path
                     commonSourceDirectory += ts.directorySeparator;
                 }
             }
@@ -63618,6 +81221,7 @@ var ts;
         }
         function getClassifiableNames() {
             if (!classifiableNames) {
+                // Initialize a checker so that all our files are bound.
                 getTypeChecker();
                 classifiableNames = ts.createUnderscoreEscapedMap();
                 for (var _i = 0, files_2 = files; _i < files_2.length; _i++) {
@@ -63628,25 +81232,51 @@ var ts;
             return classifiableNames;
         }
         function resolveModuleNamesReusingOldState(moduleNames, containingFile, file, oldProgramState) {
-            if (structuralIsReused === 0 && !file.ambientModuleNames.length) {
+            if (structuralIsReused === 0 /* Not */ && !file.ambientModuleNames.length) {
+                // If the old program state does not permit reusing resolutions and `file` does not contain locally defined ambient modules,
+                // the best we can do is fallback to the default logic.
                 return resolveModuleNamesWorker(moduleNames, containingFile);
             }
             var oldSourceFile = oldProgramState.program && oldProgramState.program.getSourceFile(containingFile);
             if (oldSourceFile !== file && file.resolvedModules) {
-                var result_4 = [];
+                // `file` was created for the new program.
+                //
+                // We only set `file.resolvedModules` via work from the current function,
+                // so it is defined iff we already called the current function on `file`.
+                // That call happened no later than the creation of the `file` object,
+                // which per above occurred during the current program creation.
+                // Since we assume the filesystem does not change during program creation,
+                // it is safe to reuse resolutions from the earlier call.
+                var result_3 = [];
                 for (var _i = 0, moduleNames_1 = moduleNames; _i < moduleNames_1.length; _i++) {
                     var moduleName = moduleNames_1[_i];
                     var resolvedModule = file.resolvedModules.get(moduleName);
-                    result_4.push(resolvedModule);
+                    result_3.push(resolvedModule);
                 }
-                return result_4;
+                return result_3;
             }
+            // At this point, we know at least one of the following hold:
+            // - file has local declarations for ambient modules
+            // - old program state is available
+            // With this information, we can infer some module resolutions without performing resolution.
+            /** An ordered list of module names for which we cannot recover the resolution. */
             var unknownModuleNames;
+            /**
+             * The indexing of elements in this list matches that of `moduleNames`.
+             *
+             * Before combining results, result[i] is in one of the following states:
+             * * undefined: needs to be recomputed,
+             * * predictedToResolveToAmbientModuleMarker: known to be an ambient module.
+             * Needs to be reset to undefined before returning,
+             * * ResolvedModuleFull instance: can be reused.
+             */
             var result;
             var reusedNames;
+            /** A transient placeholder used to mark predicted resolution in the result list. */
             var predictedToResolveToAmbientModuleMarker = {};
             for (var i = 0; i < moduleNames.length; i++) {
                 var moduleName = moduleNames[i];
+                // If the source file is unchanged and doesnt have invalidated resolution, reuse the module resolutions
                 if (file === oldSourceFile && !hasInvalidatedResolution(oldSourceFile.path)) {
                     var oldResolvedModule = oldSourceFile && oldSourceFile.resolvedModules.get(moduleName);
                     if (oldResolvedModule) {
@@ -63658,6 +81288,10 @@ var ts;
                         continue;
                     }
                 }
+                // We know moduleName resolves to an ambient module provided that moduleName:
+                // - is in the list of ambient modules locally declared in the current source file.
+                // - resolved to an ambient module in the old program whose declaration is in an unmodified file
+                //   (so the same module declaration will land in the new program)
                 var resolvesToAmbientModuleInNonModifiedFile = false;
                 if (ts.contains(file.ambientModuleNames, moduleName)) {
                     resolvesToAmbientModuleInNonModifiedFile = true;
@@ -63672,21 +81306,26 @@ var ts;
                     (result || (result = new Array(moduleNames.length)))[i] = predictedToResolveToAmbientModuleMarker;
                 }
                 else {
+                    // Resolution failed in the old program, or resolved to an ambient module for which we can't reuse the result.
                     (unknownModuleNames || (unknownModuleNames = [])).push(moduleName);
                 }
             }
             var resolutions = unknownModuleNames && unknownModuleNames.length
                 ? resolveModuleNamesWorker(unknownModuleNames, containingFile, reusedNames)
                 : ts.emptyArray;
+            // Combine results of resolutions and predicted results
             if (!result) {
+                // There were no unresolved/ambient resolutions.
                 ts.Debug.assert(resolutions.length === moduleNames.length);
                 return resolutions;
             }
             var j = 0;
             for (var i = 0; i < result.length; i++) {
                 if (result[i]) {
+                    // `result[i]` is either a `ResolvedModuleFull` or a marker.
+                    // If it is the former, we can leave it as is.
                     if (result[i] === predictedToResolveToAmbientModuleMarker) {
-                        result[i] = undefined;
+                        result[i] = undefined; // TODO: GH#18217
                     }
                 }
                 else {
@@ -63696,16 +81335,23 @@ var ts;
             }
             ts.Debug.assert(j === resolutions.length);
             return result;
+            // If we change our policy of rechecking failed lookups on each program create,
+            // we should adjust the value returned here.
             function moduleNameResolvesToAmbientModuleInNonModifiedFile(moduleName, oldProgramState) {
-                var resolutionToFile = ts.getResolvedModule(oldProgramState.oldSourceFile, moduleName);
+                var resolutionToFile = ts.getResolvedModule(oldProgramState.oldSourceFile, moduleName); // TODO: GH#18217
                 var resolvedFile = resolutionToFile && oldProgramState.program && oldProgramState.program.getSourceFile(resolutionToFile.resolvedFileName);
                 if (resolutionToFile && resolvedFile && !resolvedFile.externalModuleIndicator) {
+                    // In the old program, we resolved to an ambient module that was in the same
+                    //   place as we expected to find an actual module file.
+                    // We actually need to return 'false' here even though this seems like a 'true' case
+                    //   because the normal module resolution algorithm will find this anyway.
                     return false;
                 }
                 var ambientModule = oldProgramState.program && oldProgramState.program.getTypeChecker().tryFindAmbientModuleWithoutAugmentations(moduleName);
                 if (!(ambientModule && ambientModule.declarations)) {
                     return false;
                 }
+                // at least one of declarations should come from non-modified source file
                 var firstUnmodifiedFile = ts.forEach(ambientModule.declarations, function (d) {
                     var f = ts.getSourceFileOfNode(d);
                     return !ts.contains(oldProgramState.modifiedFilePaths, f.path) && f;
@@ -63721,74 +81367,93 @@ var ts;
         }
         function tryReuseStructureFromOldProgram() {
             if (!oldProgram) {
-                return 0;
+                return 0 /* Not */;
             }
+            // check properties that can affect structure of the program or module resolution strategy
+            // if any of these properties has changed - structure cannot be reused
             var oldOptions = oldProgram.getCompilerOptions();
             if (ts.changesAffectModuleResolution(oldOptions, options)) {
-                return oldProgram.structureIsReused = 0;
+                return oldProgram.structureIsReused = 0 /* Not */;
             }
-            ts.Debug.assert(!(oldProgram.structureIsReused & (2 | 1)));
+            ts.Debug.assert(!(oldProgram.structureIsReused & (2 /* Completely */ | 1 /* SafeModules */)));
+            // there is an old program, check if we can reuse its structure
             var oldRootNames = oldProgram.getRootFileNames();
             if (!ts.arrayIsEqualTo(oldRootNames, rootNames)) {
-                return oldProgram.structureIsReused = 0;
+                return oldProgram.structureIsReused = 0 /* Not */;
             }
             if (!ts.arrayIsEqualTo(options.types, oldOptions.types)) {
-                return oldProgram.structureIsReused = 0;
+                return oldProgram.structureIsReused = 0 /* Not */;
             }
+            // Check if any referenced project tsconfig files are different
             var oldRefs = oldProgram.getProjectReferences();
             if (projectReferences) {
                 if (!oldRefs) {
-                    return oldProgram.structureIsReused = 0;
+                    return oldProgram.structureIsReused = 0 /* Not */;
                 }
                 for (var i = 0; i < projectReferences.length; i++) {
                     var oldRef = oldRefs[i];
                     if (oldRef) {
                         var newRef = parseProjectReferenceConfigFile(projectReferences[i]);
                         if (!newRef || newRef.sourceFile !== oldRef.sourceFile) {
-                            return oldProgram.structureIsReused = 0;
+                            // Resolved project reference has gone missing or changed
+                            return oldProgram.structureIsReused = 0 /* Not */;
                         }
                     }
                     else {
+                        // A previously-unresolved reference may be resolved now
                         if (parseProjectReferenceConfigFile(projectReferences[i]) !== undefined) {
-                            return oldProgram.structureIsReused = 0;
+                            return oldProgram.structureIsReused = 0 /* Not */;
                         }
                     }
                 }
             }
             else {
                 if (oldRefs) {
-                    return oldProgram.structureIsReused = 0;
+                    return oldProgram.structureIsReused = 0 /* Not */;
                 }
             }
+            // check if program source files has changed in the way that can affect structure of the program
             var newSourceFiles = [];
             var filePaths = [];
             var modifiedSourceFiles = [];
-            oldProgram.structureIsReused = 2;
+            oldProgram.structureIsReused = 2 /* Completely */;
+            // If the missing file paths are now present, it can change the progam structure,
+            // and hence cant reuse the structure.
+            // This is same as how we dont reuse the structure if one of the file from old program is now missing
             if (oldProgram.getMissingFilePaths().some(function (missingFilePath) { return host.fileExists(missingFilePath); })) {
-                return oldProgram.structureIsReused = 0;
+                return oldProgram.structureIsReused = 0 /* Not */;
             }
             var oldSourceFiles = oldProgram.getSourceFiles();
+            var SeenPackageName;
+            (function (SeenPackageName) {
+                SeenPackageName[SeenPackageName["Exists"] = 0] = "Exists";
+                SeenPackageName[SeenPackageName["Modified"] = 1] = "Modified";
+            })(SeenPackageName || (SeenPackageName = {}));
             var seenPackageNames = ts.createMap();
             for (var _i = 0, oldSourceFiles_2 = oldSourceFiles; _i < oldSourceFiles_2.length; _i++) {
                 var oldSourceFile = oldSourceFiles_2[_i];
                 var newSourceFile = host.getSourceFileByPath
-                    ? host.getSourceFileByPath(oldSourceFile.fileName, oldSourceFile.path, options.target, undefined, shouldCreateNewSourceFile)
-                    : host.getSourceFile(oldSourceFile.fileName, options.target, undefined, shouldCreateNewSourceFile);
+                    ? host.getSourceFileByPath(oldSourceFile.fileName, oldSourceFile.resolvedPath || oldSourceFile.path, options.target, /*onError*/ undefined, shouldCreateNewSourceFile)
+                    : host.getSourceFile(oldSourceFile.fileName, options.target, /*onError*/ undefined, shouldCreateNewSourceFile); // TODO: GH#18217
                 if (!newSourceFile) {
-                    return oldProgram.structureIsReused = 0;
+                    return oldProgram.structureIsReused = 0 /* Not */;
                 }
                 ts.Debug.assert(!newSourceFile.redirectInfo, "Host should not return a redirect source file from `getSourceFile`");
                 var fileChanged = void 0;
                 if (oldSourceFile.redirectInfo) {
+                    // We got `newSourceFile` by path, so it is actually for the unredirected file.
+                    // This lets us know if the unredirected file has changed. If it has we should break the redirect.
                     if (newSourceFile !== oldSourceFile.redirectInfo.unredirected) {
-                        return oldProgram.structureIsReused = 0;
+                        // Underlying file has changed. Might not redirect anymore. Must rebuild program.
+                        return oldProgram.structureIsReused = 0 /* Not */;
                     }
                     fileChanged = false;
-                    newSourceFile = oldSourceFile;
+                    newSourceFile = oldSourceFile; // Use the redirect.
                 }
                 else if (oldProgram.redirectTargetsSet.has(oldSourceFile.path)) {
+                    // If a redirected-to source file changes, the redirect may be broken.
                     if (newSourceFile !== oldSourceFile) {
-                        return oldProgram.structureIsReused = 0;
+                        return oldProgram.structureIsReused = 0 /* Not */;
                     }
                     fileChanged = false;
                 }
@@ -63799,45 +81464,66 @@ var ts;
                 filePaths.push(newSourceFile.path);
                 var packageName = oldProgram.sourceFileToPackageName.get(oldSourceFile.path);
                 if (packageName !== undefined) {
+                    // If there are 2 different source files for the same package name and at least one of them changes,
+                    // they might become redirects. So we must rebuild the program.
                     var prevKind = seenPackageNames.get(packageName);
-                    var newKind = fileChanged ? 1 : 0;
-                    if ((prevKind !== undefined && newKind === 1) || prevKind === 1) {
-                        return oldProgram.structureIsReused = 0;
+                    var newKind = fileChanged ? 1 /* Modified */ : 0 /* Exists */;
+                    if ((prevKind !== undefined && newKind === 1 /* Modified */) || prevKind === 1 /* Modified */) {
+                        return oldProgram.structureIsReused = 0 /* Not */;
                     }
                     seenPackageNames.set(packageName, newKind);
                 }
                 if (fileChanged) {
+                    // The `newSourceFile` object was created for the new program.
+                    if (!ts.arrayIsEqualTo(oldSourceFile.libReferenceDirectives, newSourceFile.libReferenceDirectives, fileReferenceIsEqualTo)) {
+                        // 'lib' references has changed. Matches behavior in changesAffectModuleResolution
+                        return oldProgram.structureIsReused = 0 /* Not */;
+                    }
                     if (oldSourceFile.hasNoDefaultLib !== newSourceFile.hasNoDefaultLib) {
-                        oldProgram.structureIsReused = 1;
+                        // value of no-default-lib has changed
+                        // this will affect if default library is injected into the list of files
+                        oldProgram.structureIsReused = 1 /* SafeModules */;
                     }
+                    // check tripleslash references
                     if (!ts.arrayIsEqualTo(oldSourceFile.referencedFiles, newSourceFile.referencedFiles, fileReferenceIsEqualTo)) {
-                        oldProgram.structureIsReused = 1;
+                        // tripleslash references has changed
+                        oldProgram.structureIsReused = 1 /* SafeModules */;
                     }
+                    // check imports and module augmentations
                     collectExternalModuleReferences(newSourceFile);
                     if (!ts.arrayIsEqualTo(oldSourceFile.imports, newSourceFile.imports, moduleNameIsEqualTo)) {
-                        oldProgram.structureIsReused = 1;
+                        // imports has changed
+                        oldProgram.structureIsReused = 1 /* SafeModules */;
                     }
                     if (!ts.arrayIsEqualTo(oldSourceFile.moduleAugmentations, newSourceFile.moduleAugmentations, moduleNameIsEqualTo)) {
-                        oldProgram.structureIsReused = 1;
+                        // moduleAugmentations has changed
+                        oldProgram.structureIsReused = 1 /* SafeModules */;
                     }
-                    if ((oldSourceFile.flags & 1572864) !== (newSourceFile.flags & 1572864)) {
-                        oldProgram.structureIsReused = 1;
+                    if ((oldSourceFile.flags & 1572864 /* PermanentlySetIncrementalFlags */) !== (newSourceFile.flags & 1572864 /* PermanentlySetIncrementalFlags */)) {
+                        // dynamicImport has changed
+                        oldProgram.structureIsReused = 1 /* SafeModules */;
                     }
                     if (!ts.arrayIsEqualTo(oldSourceFile.typeReferenceDirectives, newSourceFile.typeReferenceDirectives, fileReferenceIsEqualTo)) {
-                        oldProgram.structureIsReused = 1;
+                        // 'types' references has changed
+                        oldProgram.structureIsReused = 1 /* SafeModules */;
                     }
+                    // tentatively approve the file
                     modifiedSourceFiles.push({ oldFile: oldSourceFile, newFile: newSourceFile });
                 }
                 else if (hasInvalidatedResolution(oldSourceFile.path)) {
-                    oldProgram.structureIsReused = 1;
+                    // 'module/types' references could have changed
+                    oldProgram.structureIsReused = 1 /* SafeModules */;
+                    // add file to the modified list so that we will resolve it later
                     modifiedSourceFiles.push({ oldFile: oldSourceFile, newFile: newSourceFile });
                 }
+                // if file has passed all checks it should be safe to reuse it
                 newSourceFiles.push(newSourceFile);
             }
-            if (oldProgram.structureIsReused !== 2) {
+            if (oldProgram.structureIsReused !== 2 /* Completely */) {
                 return oldProgram.structureIsReused;
             }
             modifiedFilePaths = modifiedSourceFiles.map(function (f) { return f.newFile.path; });
+            // try to verify results of module resolution
             for (var _a = 0, modifiedSourceFiles_1 = modifiedSourceFiles; _a < modifiedSourceFiles_1.length; _a++) {
                 var _b = modifiedSourceFiles_1[_a], oldSourceFile = _b.oldFile, newSourceFile = _b.newFile;
                 var newSourceFilePath = ts.getNormalizedAbsolutePath(newSourceFile.fileName, currentDirectory);
@@ -63845,9 +81531,10 @@ var ts;
                     var moduleNames = getModuleNames(newSourceFile);
                     var oldProgramState = { program: oldProgram, oldSourceFile: oldSourceFile, modifiedFilePaths: modifiedFilePaths };
                     var resolutions = resolveModuleNamesReusingOldState(moduleNames, newSourceFilePath, newSourceFile, oldProgramState);
+                    // ensure that module resolution results are still correct
                     var resolutionsChanged = ts.hasChangesInResolutions(moduleNames, resolutions, oldSourceFile.resolvedModules, ts.moduleResolutionIsEqualTo);
                     if (resolutionsChanged) {
-                        oldProgram.structureIsReused = 1;
+                        oldProgram.structureIsReused = 1 /* SafeModules */;
                         newSourceFile.resolvedModules = ts.zipToMap(moduleNames, resolutions);
                     }
                     else {
@@ -63857,9 +81544,10 @@ var ts;
                 if (resolveTypeReferenceDirectiveNamesWorker) {
                     var typesReferenceDirectives = ts.map(newSourceFile.typeReferenceDirectives, function (x) { return x.fileName; });
                     var resolutions = resolveTypeReferenceDirectiveNamesWorker(typesReferenceDirectives, newSourceFilePath);
+                    // ensure that types resolutions are still correct
                     var resolutionsChanged = ts.hasChangesInResolutions(typesReferenceDirectives, resolutions, oldSourceFile.resolvedTypeReferenceDirectiveNames, ts.typeDirectiveIsEqualTo);
                     if (resolutionsChanged) {
-                        oldProgram.structureIsReused = 1;
+                        oldProgram.structureIsReused = 1 /* SafeModules */;
                         newSourceFile.resolvedTypeReferenceDirectiveNames = ts.zipToMap(typesReferenceDirectives, resolutions);
                     }
                     else {
@@ -63867,15 +81555,17 @@ var ts;
                     }
                 }
             }
-            if (oldProgram.structureIsReused !== 2) {
+            if (oldProgram.structureIsReused !== 2 /* Completely */) {
                 return oldProgram.structureIsReused;
             }
             if (host.hasChangedAutomaticTypeDirectiveNames) {
-                return oldProgram.structureIsReused = 1;
+                return oldProgram.structureIsReused = 1 /* SafeModules */;
             }
             missingFilePaths = oldProgram.getMissingFilePaths();
+            // update fileName -> file mapping
             for (var i = 0; i < newSourceFiles.length; i++) {
                 filesByName.set(filePaths[i], newSourceFiles[i]);
+                // Set the file as found during node modules search if it was found that way in old progra,
                 if (oldProgram.isSourceFileFromExternalLibrary(oldProgram.getSourceFileByPath(filePaths[i]))) {
                     sourceFilesFoundSearchingNodeModules.set(filePaths[i], true);
                 }
@@ -63889,23 +81579,11 @@ var ts;
             resolvedTypeReferenceDirectives = oldProgram.getResolvedTypeReferenceDirectives();
             sourceFileToPackageName = oldProgram.sourceFileToPackageName;
             redirectTargetsSet = oldProgram.redirectTargetsSet;
-            return oldProgram.structureIsReused = 2;
+            return oldProgram.structureIsReused = 2 /* Completely */;
         }
         function getEmitHost(writeFileCallback) {
-            return {
-                getPrependNodes: getPrependNodes,
-                getCanonicalFileName: getCanonicalFileName,
-                getCommonSourceDirectory: program.getCommonSourceDirectory,
-                getCompilerOptions: program.getCompilerOptions,
-                getCurrentDirectory: function () { return currentDirectory; },
-                getNewLine: function () { return host.getNewLine(); },
-                getSourceFile: program.getSourceFile,
-                getSourceFileByPath: program.getSourceFileByPath,
-                getSourceFiles: program.getSourceFiles,
-                isSourceFileFromExternalLibrary: isSourceFileFromExternalLibrary,
-                writeFile: writeFileCallback || (function (fileName, data, writeByteOrderMark, onError, sourceFiles) { return host.writeFile(fileName, data, writeByteOrderMark, onError, sourceFiles); }),
-                isEmitBlocked: isEmitBlocked,
-            };
+            return __assign({ getPrependNodes: getPrependNodes,
+                getCanonicalFileName: getCanonicalFileName, getCommonSourceDirectory: program.getCommonSourceDirectory, getCompilerOptions: program.getCompilerOptions, getCurrentDirectory: function () { return currentDirectory; }, getNewLine: function () { return host.getNewLine(); }, getSourceFile: program.getSourceFile, getSourceFileByPath: program.getSourceFileByPath, getSourceFiles: program.getSourceFiles, isSourceFileFromExternalLibrary: isSourceFileFromExternalLibrary, writeFile: writeFileCallback || (function (fileName, data, writeByteOrderMark, onError, sourceFiles) { return host.writeFile(fileName, data, writeByteOrderMark, onError, sourceFiles); }), isEmitBlocked: isEmitBlocked, readFile: function (f) { return host.readFile(f); }, fileExists: function (f) { return host.fileExists(f); } }, (host.directoryExists ? { directoryExists: function (f) { return host.directoryExists(f); } } : {}));
         }
         function getProjectReferences() {
             if (!resolvedProjectReferences)
@@ -63921,12 +81599,15 @@ var ts;
                 var ref = projectReferences[i];
                 var resolvedRefOpts = resolvedProjectReferences[i].commandLine;
                 if (ref.prepend && resolvedRefOpts && resolvedRefOpts.options) {
+                    // Upstream project didn't have outFile set -- skip (error will have been issued earlier)
                     if (!resolvedRefOpts.options.outFile)
                         continue;
                     var dtsFilename = ts.changeExtension(resolvedRefOpts.options.outFile, ".d.ts");
                     var js = host.readFile(resolvedRefOpts.options.outFile) || "/* Input file " + resolvedRefOpts.options.outFile + " was missing */\r\n";
+                    var jsMap = host.readFile(resolvedRefOpts.options.outFile + ".map"); // TODO: try to read sourceMappingUrl comment from the js file
                     var dts = host.readFile(dtsFilename) || "/* Input file " + dtsFilename + " was missing */\r\n";
-                    var node = ts.createInputFiles(js, dts);
+                    var dtsMap = host.readFile(dtsFilename + ".map");
+                    var node = ts.createInputFiles(js, dts, jsMap, dtsMap);
                     nodes.push(node);
                 }
             }
@@ -63942,6 +81623,8 @@ var ts;
             if (!options.noLib) {
                 return false;
             }
+            // If '--lib' is not specified, include default library file according to '--target'
+            // otherwise, using options specified in '--lib' instead of '--target' default library file
             var equalityComparer = host.useCaseSensitiveFileNames() ? ts.equateStringsCaseSensitive : ts.equateStringsCaseInsensitive;
             if (!options.lib) {
                 return equalityComparer(file.fileName, getDefaultLibraryFileName());
@@ -63951,13 +81634,13 @@ var ts;
             }
         }
         function getDiagnosticsProducingTypeChecker() {
-            return diagnosticsProducingTypeChecker || (diagnosticsProducingTypeChecker = ts.createTypeChecker(program, true));
+            return diagnosticsProducingTypeChecker || (diagnosticsProducingTypeChecker = ts.createTypeChecker(program, /*produceDiagnostics:*/ true));
         }
         function dropDiagnosticsProducingTypeChecker() {
             diagnosticsProducingTypeChecker = undefined;
         }
         function getTypeChecker() {
-            return noDiagnosticsTypeChecker || (noDiagnosticsTypeChecker = ts.createTypeChecker(program, false));
+            return noDiagnosticsTypeChecker || (noDiagnosticsTypeChecker = ts.createTypeChecker(program, /*produceDiagnostics:*/ false));
         }
         function emit(sourceFile, writeFileCallback, cancellationToken, emitOnlyDtsFiles, transformers) {
             return runWithCancellationToken(function () { return emitWorker(program, sourceFile, writeFileCallback, cancellationToken, emitOnlyDtsFiles, transformers); });
@@ -63971,10 +81654,13 @@ var ts;
                 if (options.noEmit) {
                     return { diagnostics: declarationDiagnostics, sourceMaps: undefined, emittedFiles: undefined, emitSkipped: true };
                 }
+                // If the noEmitOnError flag is set, then check if we have any errors so far.  If so,
+                // immediately bail out.  Note that we pass 'undefined' for 'sourceFile' so that we
+                // get any preEmit diagnostics, not just the ones
                 if (options.noEmitOnError) {
                     var diagnostics = program.getOptionsDiagnostics(cancellationToken).concat(program.getSyntacticDiagnostics(sourceFile, cancellationToken), program.getGlobalDiagnostics(cancellationToken), program.getSemanticDiagnostics(sourceFile, cancellationToken));
                     if (diagnostics.length === 0 && program.getCompilerOptions().declaration) {
-                        declarationDiagnostics = program.getDeclarationDiagnostics(undefined, cancellationToken);
+                        declarationDiagnostics = program.getDeclarationDiagnostics(/*sourceFile*/ undefined, cancellationToken);
                     }
                     if (diagnostics.length > 0 || declarationDiagnostics.length > 0) {
                         return {
@@ -63986,10 +81672,19 @@ var ts;
                     }
                 }
             }
+            // Create the emit resolver outside of the "emitTime" tracking code below.  That way
+            // any cost associated with it (like type checking) are appropriate associated with
+            // the type-checking counter.
+            //
+            // If the -out option is specified, we should not pass the source file to getEmitResolver.
+            // This is because in the -out scenario all files need to be emitted, and therefore all
+            // files need to be type checked. And the way to specify that all files need to be type
+            // checked is to not pass the file to getEmitResolver.
             var emitResolver = getDiagnosticsProducingTypeChecker().getEmitResolver((options.outFile || options.out) ? undefined : sourceFile, cancellationToken);
             ts.performance.mark("beforeEmit");
             var transformers = emitOnlyDtsFiles ? [] : ts.getTransformers(options, customTransformers);
-            var emitResult = ts.emitFiles(emitResolver, getEmitHost(writeFileCallback), sourceFile, emitOnlyDtsFiles, transformers, customTransformers && customTransformers.afterDeclarations);
+            var emitResult = ts.emitFiles(emitResolver, getEmitHost(writeFileCallback), sourceFile, // TODO: GH#18217
+            emitOnlyDtsFiles, transformers, customTransformers && customTransformers.afterDeclarations);
             ts.performance.mark("afterEmit");
             ts.performance.measure("Emit", "beforeEmit", "afterEmit");
             return emitResult;
@@ -64019,6 +81714,7 @@ var ts;
         }
         function getDeclarationDiagnostics(sourceFile, cancellationToken) {
             var options = program.getCompilerOptions();
+            // collect diagnostics from the program only once if either no source file was specified or out/outFile is set (bundled emit)
             if (!sourceFile || options.out || options.outFile) {
                 return getDeclarationDiagnosticsWorker(sourceFile, cancellationToken);
             }
@@ -64027,6 +81723,8 @@ var ts;
             }
         }
         function getSyntacticDiagnosticsForFile(sourceFile) {
+            // For JavaScript files, we report semantic errors for using TypeScript-only
+            // constructs from within a JavaScript file as syntactic errors.
             if (ts.isSourceFileJavaScript(sourceFile)) {
                 if (!sourceFile.additionalSyntacticDiagnostics) {
                     sourceFile.additionalSyntacticDiagnostics = getJavaScriptSyntacticDiagnosticsForFile(sourceFile);
@@ -64041,6 +81739,15 @@ var ts;
             }
             catch (e) {
                 if (e instanceof ts.OperationCanceledException) {
+                    // We were canceled while performing the operation.  Because our type checker
+                    // might be a bad state, we need to throw it away.
+                    //
+                    // Note: we are overly aggressive here.  We do not actually *have* to throw away
+                    // the "noDiagnosticsTypeChecker".  However, for simplicity, i'd like to keep
+                    // the lifetimes of these two TypeCheckers the same.  Also, we generally only
+                    // cancel when the user has made a change anyways.  And, in that case, we (the
+                    // program instance) will get thrown away anyways.  So trying to keep one of
+                    // these type checkers alive doesn't serve much purpose.
                     noDiagnosticsTypeChecker = undefined;
                     diagnosticsProducingTypeChecker = undefined;
                 }
@@ -64052,14 +81759,18 @@ var ts;
         }
         function getSemanticDiagnosticsForFileNoCache(sourceFile, cancellationToken) {
             return runWithCancellationToken(function () {
+                // If skipLibCheck is enabled, skip reporting errors if file is a declaration file.
+                // If skipDefaultLibCheck is enabled, skip reporting errors if file contains a
+                // '/// <reference no-default-lib="true"/>' directive.
                 if (options.skipLibCheck && sourceFile.isDeclarationFile || options.skipDefaultLibCheck && sourceFile.hasNoDefaultLib) {
                     return ts.emptyArray;
                 }
                 var typeChecker = getDiagnosticsProducingTypeChecker();
                 ts.Debug.assert(!!sourceFile.bindDiagnostics);
                 var isCheckJs = ts.isCheckJsEnabledForFile(sourceFile, options);
-                var includeBindAndCheckDiagnostics = sourceFile.scriptKind === 3 || sourceFile.scriptKind === 4 ||
-                    sourceFile.scriptKind === 5 || isCheckJs || sourceFile.scriptKind === 7;
+                // By default, only type-check .ts, .tsx, 'Deferred' and 'External' files (external files are added by plugins)
+                var includeBindAndCheckDiagnostics = sourceFile.scriptKind === 3 /* TS */ || sourceFile.scriptKind === 4 /* TSX */ ||
+                    sourceFile.scriptKind === 5 /* External */ || isCheckJs || sourceFile.scriptKind === 7 /* Deferred */;
                 var bindDiagnostics = includeBindAndCheckDiagnostics ? sourceFile.bindDiagnostics : ts.emptyArray;
                 var checkDiagnostics = includeBindAndCheckDiagnostics ? typeChecker.getDiagnostics(sourceFile, cancellationToken) : ts.emptyArray;
                 var fileProcessingDiagnosticsInFile = fileProcessingDiagnostics.getDiagnostics(sourceFile.fileName);
@@ -64084,18 +81795,23 @@ var ts;
                 return getDiagnosticsProducingTypeChecker().getSuggestionDiagnostics(sourceFile, cancellationToken);
             });
         }
+        /**
+         * Skip errors if previous line start with '// @ts-ignore' comment, not counting non-empty non-comment lines
+         */
         function shouldReportDiagnostic(diagnostic) {
             var file = diagnostic.file, start = diagnostic.start;
             if (file) {
                 var lineStarts = ts.getLineStarts(file);
-                var line = ts.computeLineAndCharacterOfPosition(lineStarts, start).line;
+                var line = ts.computeLineAndCharacterOfPosition(lineStarts, start).line; // TODO: GH#18217
                 while (line > 0) {
                     var previousLineText = file.text.slice(lineStarts[line - 1], lineStarts[line]);
                     var result = ignoreDiagnosticCommentRegEx.exec(previousLineText);
                     if (!result) {
+                        // non-empty line
                         return true;
                     }
                     if (result[3]) {
+                        // @ts-ignore
                         return false;
                     }
                     line--;
@@ -64110,64 +81826,68 @@ var ts;
                 walk(sourceFile);
                 return diagnostics;
                 function walk(node) {
+                    // Return directly from the case if the given node doesnt want to visit each child
+                    // Otherwise break to visit each child
                     switch (parent.kind) {
-                        case 149:
-                        case 152:
+                        case 149 /* Parameter */:
+                        case 152 /* PropertyDeclaration */:
                             if (parent.questionToken === node) {
                                 diagnostics.push(createDiagnosticForNode(node, ts.Diagnostics._0_can_only_be_used_in_a_ts_file, "?"));
                                 return;
                             }
-                        case 154:
-                        case 153:
-                        case 155:
-                        case 156:
-                        case 157:
-                        case 192:
-                        case 234:
-                        case 193:
-                        case 232:
+                        // falls through
+                        case 154 /* MethodDeclaration */:
+                        case 153 /* MethodSignature */:
+                        case 155 /* Constructor */:
+                        case 156 /* GetAccessor */:
+                        case 157 /* SetAccessor */:
+                        case 192 /* FunctionExpression */:
+                        case 234 /* FunctionDeclaration */:
+                        case 193 /* ArrowFunction */:
+                        case 232 /* VariableDeclaration */:
+                            // type annotation
                             if (parent.type === node) {
                                 diagnostics.push(createDiagnosticForNode(node, ts.Diagnostics.types_can_only_be_used_in_a_ts_file));
                                 return;
                             }
                     }
                     switch (node.kind) {
-                        case 243:
+                        case 243 /* ImportEqualsDeclaration */:
                             diagnostics.push(createDiagnosticForNode(node, ts.Diagnostics.import_can_only_be_used_in_a_ts_file));
                             return;
-                        case 249:
+                        case 249 /* ExportAssignment */:
                             if (node.isExportEquals) {
                                 diagnostics.push(createDiagnosticForNode(node, ts.Diagnostics.export_can_only_be_used_in_a_ts_file));
                                 return;
                             }
                             break;
-                        case 268:
+                        case 268 /* HeritageClause */:
                             var heritageClause = node;
-                            if (heritageClause.token === 108) {
+                            if (heritageClause.token === 108 /* ImplementsKeyword */) {
                                 diagnostics.push(createDiagnosticForNode(node, ts.Diagnostics.implements_clauses_can_only_be_used_in_a_ts_file));
                                 return;
                             }
                             break;
-                        case 236:
+                        case 236 /* InterfaceDeclaration */:
                             diagnostics.push(createDiagnosticForNode(node, ts.Diagnostics.interface_declarations_can_only_be_used_in_a_ts_file));
                             return;
-                        case 239:
+                        case 239 /* ModuleDeclaration */:
                             diagnostics.push(createDiagnosticForNode(node, ts.Diagnostics.module_declarations_can_only_be_used_in_a_ts_file));
                             return;
-                        case 237:
+                        case 237 /* TypeAliasDeclaration */:
                             diagnostics.push(createDiagnosticForNode(node, ts.Diagnostics.type_aliases_can_only_be_used_in_a_ts_file));
                             return;
-                        case 238:
+                        case 238 /* EnumDeclaration */:
                             diagnostics.push(createDiagnosticForNode(node, ts.Diagnostics.enum_declarations_can_only_be_used_in_a_ts_file));
                             return;
-                        case 209:
+                        case 209 /* NonNullExpression */:
                             diagnostics.push(createDiagnosticForNode(node, ts.Diagnostics.non_null_assertions_can_only_be_used_in_a_ts_file));
                             return;
-                        case 208:
+                        case 208 /* AsExpression */:
                             diagnostics.push(createDiagnosticForNode(node.type, ts.Diagnostics.type_assertion_expressions_can_only_be_used_in_a_ts_file));
                             return;
-                        case 190:
-                            ts.Debug.fail();
+                        case 190 /* TypeAssertionExpression */:
+                            ts.Debug.fail(); // Won't parse these in a JS file anyway, as they are interpreted as JSX.
                     }
                     var prevParent = parent;
                     parent = node;
@@ -64179,54 +81899,60 @@ var ts;
                         diagnostics.push(createDiagnosticForNode(parent, ts.Diagnostics.Experimental_support_for_decorators_is_a_feature_that_is_subject_to_change_in_a_future_release_Set_the_experimentalDecorators_option_to_remove_this_warning));
                     }
                     switch (parent.kind) {
-                        case 235:
-                        case 154:
-                        case 153:
-                        case 155:
-                        case 156:
-                        case 157:
-                        case 192:
-                        case 234:
-                        case 193:
+                        case 235 /* ClassDeclaration */:
+                        case 154 /* MethodDeclaration */:
+                        case 153 /* MethodSignature */:
+                        case 155 /* Constructor */:
+                        case 156 /* GetAccessor */:
+                        case 157 /* SetAccessor */:
+                        case 192 /* FunctionExpression */:
+                        case 234 /* FunctionDeclaration */:
+                        case 193 /* ArrowFunction */:
+                            // Check type parameters
                             if (nodes === parent.typeParameters) {
                                 diagnostics.push(createDiagnosticForNodeArray(nodes, ts.Diagnostics.type_parameter_declarations_can_only_be_used_in_a_ts_file));
                                 return;
                             }
-                        case 214:
+                        // falls through
+                        case 214 /* VariableStatement */:
+                            // Check modifiers
                             if (nodes === parent.modifiers) {
-                                return checkModifiers(nodes, parent.kind === 214);
+                                return checkModifiers(nodes, parent.kind === 214 /* VariableStatement */);
                             }
                             break;
-                        case 152:
+                        case 152 /* PropertyDeclaration */:
+                            // Check modifiers of property declaration
                             if (nodes === parent.modifiers) {
                                 for (var _i = 0, _a = nodes; _i < _a.length; _i++) {
                                     var modifier = _a[_i];
-                                    if (modifier.kind !== 115) {
+                                    if (modifier.kind !== 115 /* StaticKeyword */) {
                                         diagnostics.push(createDiagnosticForNode(modifier, ts.Diagnostics._0_can_only_be_used_in_a_ts_file, ts.tokenToString(modifier.kind)));
                                     }
                                 }
                                 return;
                             }
                             break;
-                        case 149:
+                        case 149 /* Parameter */:
+                            // Check modifiers of parameter declaration
                             if (nodes === parent.modifiers) {
                                 diagnostics.push(createDiagnosticForNodeArray(nodes, ts.Diagnostics.parameter_modifiers_can_only_be_used_in_a_ts_file));
                                 return;
                             }
                             break;
-                        case 187:
-                        case 188:
-                        case 207:
-                        case 256:
-                        case 257:
+                        case 187 /* CallExpression */:
+                        case 188 /* NewExpression */:
+                        case 207 /* ExpressionWithTypeArguments */:
+                        case 256 /* JsxSelfClosingElement */:
+                        case 257 /* JsxOpeningElement */:
+                            // Check type arguments
                             if (nodes === parent.typeArguments) {
                                 diagnostics.push(createDiagnosticForNodeArray(nodes, ts.Diagnostics.type_arguments_can_only_be_used_in_a_ts_file));
                                 return;
                             }
                             break;
                     }
-                    for (var _b = 0, nodes_6 = nodes; _b < nodes_6.length; _b++) {
-                        var node = nodes_6[_b];
+                    for (var _b = 0, nodes_5 = nodes; _b < nodes_5.length; _b++) {
+                        var node = nodes_5[_b];
                         walk(node);
                     }
                 }
@@ -64234,21 +81960,24 @@ var ts;
                     for (var _i = 0, modifiers_1 = modifiers; _i < modifiers_1.length; _i++) {
                         var modifier = modifiers_1[_i];
                         switch (modifier.kind) {
-                            case 76:
+                            case 76 /* ConstKeyword */:
                                 if (isConstValid) {
                                     continue;
                                 }
-                            case 114:
-                            case 112:
-                            case 113:
-                            case 132:
-                            case 124:
-                            case 117:
+                            // to report error,
+                            // falls through
+                            case 114 /* PublicKeyword */:
+                            case 112 /* PrivateKeyword */:
+                            case 113 /* ProtectedKeyword */:
+                            case 132 /* ReadonlyKeyword */:
+                            case 124 /* DeclareKeyword */:
+                            case 117 /* AbstractKeyword */:
                                 diagnostics.push(createDiagnosticForNode(modifier, ts.Diagnostics._0_can_only_be_used_in_a_ts_file, ts.tokenToString(modifier.kind)));
                                 break;
-                            case 115:
-                            case 84:
-                            case 79:
+                            // These are all legal modifiers.
+                            case 115 /* StaticKeyword */:
+                            case 84 /* ExportKeyword */:
+                            case 79 /* DefaultKeyword */:
                         }
                     }
                 }
@@ -64256,6 +81985,8 @@ var ts;
                     var start = nodes.pos;
                     return ts.createFileDiagnostic(sourceFile, start, nodes.end - start, message, arg0, arg1, arg2);
                 }
+                // Since these are syntactic diagnostics, parent might not have been set
+                // this means the sourceFile cannot be infered from the node
                 function createDiagnosticForNode(node, message, arg0, arg1, arg2) {
                     return ts.createDiagnosticForNodeInSourceFile(sourceFile, node, message, arg0, arg1, arg2);
                 }
@@ -64267,6 +81998,7 @@ var ts;
         function getDeclarationDiagnosticsForFileNoCache(sourceFile, cancellationToken) {
             return runWithCancellationToken(function () {
                 var resolver = getDiagnosticsProducingTypeChecker().getEmitResolver(sourceFile, cancellationToken);
+                // Don't actually write any files since we're just getting diagnostics.
                 return ts.getDeclarationDiagnostics(getEmitHost(ts.noop), resolver, sourceFile);
             });
         }
@@ -64277,7 +82009,7 @@ var ts;
             if (cachedResult) {
                 return cachedResult;
             }
-            var result = getDiagnostics(sourceFile, cancellationToken) || ts.emptyArray;
+            var result = getDiagnostics(sourceFile, cancellationToken) || ts.emptyArray; // TODO: GH#18217
             if (sourceFile) {
                 if (!cache.perFile) {
                     cache.perFile = ts.createMap();
@@ -64301,16 +82033,16 @@ var ts;
         function getConfigFileParsingDiagnostics() {
             return configFileParsingDiagnostics || ts.emptyArray;
         }
-        function processRootFile(fileName, isDefaultLib) {
-            processSourceFile(ts.normalizePath(fileName), isDefaultLib, undefined);
+        function processRootFile(fileName, isDefaultLib, ignoreNoDefaultLib) {
+            processSourceFile(ts.normalizePath(fileName), isDefaultLib, ignoreNoDefaultLib, /*packageId*/ undefined);
         }
         function fileReferenceIsEqualTo(a, b) {
             return a.fileName === b.fileName;
         }
         function moduleNameIsEqualTo(a, b) {
-            return a.kind === 71
-                ? b.kind === 71 && a.escapedText === b.escapedText
-                : b.kind === 9 && a.text === b.text;
+            return a.kind === 71 /* Identifier */
+                ? b.kind === 71 /* Identifier */ && a.escapedText === b.escapedText
+                : b.kind === 9 /* StringLiteral */ && a.text === b.text;
         }
         function collectExternalModuleReferences(file) {
             if (file.imports) {
@@ -64318,27 +82050,31 @@ var ts;
             }
             var isJavaScriptFile = ts.isSourceFileJavaScript(file);
             var isExternalModuleFile = ts.isExternalModule(file);
+            // file.imports may not be undefined if there exists dynamic import
             var imports;
             var moduleAugmentations;
             var ambientModules;
+            // If we are importing helpers, we need to add a synthetic reference to resolve the
+            // helpers library.
             if (options.importHelpers
                 && (options.isolatedModules || isExternalModuleFile)
                 && !file.isDeclarationFile) {
+                // synthesize 'import "tslib"' declaration
                 var externalHelpersModuleReference = ts.createLiteral(ts.externalHelpersModuleNameText);
-                var importDecl = ts.createImportDeclaration(undefined, undefined, undefined, externalHelpersModuleReference);
-                ts.addEmitFlags(importDecl, 67108864);
+                var importDecl = ts.createImportDeclaration(/*decorators*/ undefined, /*modifiers*/ undefined, /*importClause*/ undefined, externalHelpersModuleReference);
+                ts.addEmitFlags(importDecl, 67108864 /* NeverApplyImportHelper */);
                 externalHelpersModuleReference.parent = importDecl;
                 importDecl.parent = file;
                 imports = [externalHelpersModuleReference];
             }
             for (var _i = 0, _a = file.statements; _i < _a.length; _i++) {
                 var node = _a[_i];
-                collectModuleReferences(node, false);
-                if ((file.flags & 524288) || isJavaScriptFile) {
+                collectModuleReferences(node, /*inAmbientModule*/ false);
+                if ((file.flags & 524288 /* PossiblyContainsDynamicImport */) || isJavaScriptFile) {
                     collectDynamicImportOrRequireCalls(node);
                 }
             }
-            if ((file.flags & 524288) || isJavaScriptFile) {
+            if ((file.flags & 524288 /* PossiblyContainsDynamicImport */) || isJavaScriptFile) {
                 collectDynamicImportOrRequireCalls(file.endOfFileToken);
             }
             file.imports = imports || ts.emptyArray;
@@ -64348,25 +82084,39 @@ var ts;
             function collectModuleReferences(node, inAmbientModule) {
                 if (ts.isAnyImportOrReExport(node)) {
                     var moduleNameExpr = ts.getExternalModuleName(node);
+                    // TypeScript 1.0 spec (April 2014): 12.1.6
+                    // An ExternalImportDeclaration in an AmbientExternalModuleDeclaration may reference other external modules
+                    // only through top - level external module names. Relative external module names are not permitted.
                     if (moduleNameExpr && ts.isStringLiteral(moduleNameExpr) && moduleNameExpr.text && (!inAmbientModule || !ts.isExternalModuleNameRelative(moduleNameExpr.text))) {
                         imports = ts.append(imports, moduleNameExpr);
                     }
                 }
                 else if (ts.isModuleDeclaration(node)) {
-                    if (ts.isAmbientModule(node) && (inAmbientModule || ts.hasModifier(node, 2) || file.isDeclarationFile)) {
+                    if (ts.isAmbientModule(node) && (inAmbientModule || ts.hasModifier(node, 2 /* Ambient */) || file.isDeclarationFile)) {
                         var nameText = ts.getTextOfIdentifierOrLiteral(node.name);
+                        // Ambient module declarations can be interpreted as augmentations for some existing external modules.
+                        // This will happen in two cases:
+                        // - if current file is external module then module augmentation is a ambient module declaration defined in the top level scope
+                        // - if current file is not external module then module augmentation is an ambient module declaration with non-relative module name
+                        //   immediately nested in top level ambient module declaration .
                         if (isExternalModuleFile || (inAmbientModule && !ts.isExternalModuleNameRelative(nameText))) {
                             (moduleAugmentations || (moduleAugmentations = [])).push(node.name);
                         }
                         else if (!inAmbientModule) {
                             if (file.isDeclarationFile) {
+                                // for global .d.ts files record name of ambient module
                                 (ambientModules || (ambientModules = [])).push(nameText);
                             }
+                            // An AmbientExternalModuleDeclaration declares an external module.
+                            // This type of declaration is permitted only in the global module.
+                            // The StringLiteral must specify a top - level external module name.
+                            // Relative external module names are not permitted
+                            // NOTE: body of ambient module is always a module block, if it exists
                             var body = node.body;
                             if (body) {
                                 for (var _i = 0, _a = body.statements; _i < _a.length; _i++) {
                                     var statement = _a[_i];
-                                    collectModuleReferences(statement, true);
+                                    collectModuleReferences(statement, /*inAmbientModule*/ true);
                                 }
                             }
                         }
@@ -64374,26 +82124,33 @@ var ts;
                 }
             }
             function collectDynamicImportOrRequireCalls(node) {
-                if (ts.isRequireCall(node, true)) {
+                if (ts.isRequireCall(node, /*checkArgumentIsStringLiteralLike*/ true)) {
                     imports = ts.append(imports, node.arguments[0]);
                 }
+                // we have to check the argument list has length of 1. We will still have to process these even though we have parsing error.
                 else if (ts.isImportCall(node) && node.arguments.length === 1 && ts.isStringLiteralLike(node.arguments[0])) {
                     imports = ts.append(imports, node.arguments[0]);
                 }
                 else if (ts.isLiteralImportTypeNode(node)) {
                     imports = ts.append(imports, node.argument.literal);
                 }
-                else {
-                    collectDynamicImportOrRequireCallsForEachChild(node);
-                    if (ts.hasJSDocNodes(node)) {
-                        ts.forEach(node.jsDoc, collectDynamicImportOrRequireCallsForEachChild);
-                    }
+                collectDynamicImportOrRequireCallsForEachChild(node);
+                if (ts.hasJSDocNodes(node)) {
+                    ts.forEach(node.jsDoc, collectDynamicImportOrRequireCallsForEachChild);
                 }
             }
             function collectDynamicImportOrRequireCallsForEachChild(node) {
                 ts.forEachChild(node, collectDynamicImportOrRequireCalls);
             }
         }
+        function getLibFileFromReference(ref) {
+            var libName = ref.fileName.toLocaleLowerCase();
+            var libFileName = ts.libMap.get(libName);
+            if (libFileName) {
+                return getSourceFile(ts.combinePaths(defaultLibraryPath, libFileName));
+            }
+        }
+        /** This should have similar behavior to 'processSourceFile' without diagnostics or mutation. */
         function getSourceFileFromReference(referencingFile, ref) {
             return getSourceFileFromReferenceWorker(resolveTripleslashReference(ref.fileName, referencingFile.fileName), function (fileName) { return filesByName.get(toPath(fileName)); });
         }
@@ -64431,12 +82188,14 @@ var ts;
                 }
                 var sourceFileWithAddedExtension = ts.forEach(supportedExtensions, function (extension) { return getSourceFile(fileName + extension); });
                 if (fail && !sourceFileWithAddedExtension)
-                    fail(ts.Diagnostics.File_0_not_found, fileName + ".ts");
+                    fail(ts.Diagnostics.File_0_not_found, fileName + ".ts" /* Ts */);
                 return sourceFileWithAddedExtension;
             }
         }
-        function processSourceFile(fileName, isDefaultLib, packageId, refFile, refPos, refEnd) {
-            getSourceFileFromReferenceWorker(fileName, function (fileName) { return findSourceFile(fileName, toPath(fileName), isDefaultLib, refFile, refPos, refEnd, packageId); }, function (diagnostic) {
+        /** This has side effects through `findSourceFile`. */
+        function processSourceFile(fileName, isDefaultLib, ignoreNoDefaultLib, packageId, refFile, refPos, refEnd) {
+            getSourceFileFromReferenceWorker(fileName, function (fileName) { return findSourceFile(fileName, toPath(fileName), isDefaultLib, ignoreNoDefaultLib, refFile, refPos, refEnd, packageId); }, // TODO: GH#18217
+            function (diagnostic) {
                 var args = [];
                 for (var _i = 1; _i < arguments.length; _i++) {
                     args[_i - 1] = arguments[_i];
@@ -64470,28 +82229,35 @@ var ts;
             });
             return redirect;
         }
-        function findSourceFile(fileName, path, isDefaultLib, refFile, refPos, refEnd, packageId) {
+        // Get source file from normalized fileName
+        function findSourceFile(fileName, path, isDefaultLib, ignoreNoDefaultLib, refFile, refPos, refEnd, packageId) {
             if (filesByName.has(path)) {
-                var file_10 = filesByName.get(path);
-                if (file_10 && options.forceConsistentCasingInFileNames && ts.getNormalizedAbsolutePath(file_10.fileName, currentDirectory) !== ts.getNormalizedAbsolutePath(fileName, currentDirectory)) {
-                    reportFileNamesDifferOnlyInCasingError(fileName, file_10.fileName, refFile, refPos, refEnd);
+                var file_1 = filesByName.get(path);
+                // try to check if we've already seen this file but with a different casing in path
+                // NOTE: this only makes sense for case-insensitive file systems
+                if (file_1 && options.forceConsistentCasingInFileNames && ts.getNormalizedAbsolutePath(file_1.fileName, currentDirectory) !== ts.getNormalizedAbsolutePath(fileName, currentDirectory)) {
+                    reportFileNamesDifferOnlyInCasingError(fileName, file_1.fileName, refFile, refPos, refEnd);
                 }
-                if (file_10 && sourceFilesFoundSearchingNodeModules.get(file_10.path) && currentNodeModulesDepth === 0) {
-                    sourceFilesFoundSearchingNodeModules.set(file_10.path, false);
+                // If the file was previously found via a node_modules search, but is now being processed as a root file,
+                // then everything it sucks in may also be marked incorrectly, and needs to be checked again.
+                if (file_1 && sourceFilesFoundSearchingNodeModules.get(file_1.path) && currentNodeModulesDepth === 0) {
+                    sourceFilesFoundSearchingNodeModules.set(file_1.path, false);
                     if (!options.noResolve) {
-                        processReferencedFiles(file_10, isDefaultLib);
-                        processTypeReferenceDirectives(file_10);
+                        processReferencedFiles(file_1, isDefaultLib);
+                        processTypeReferenceDirectives(file_1);
                     }
-                    modulesWithElidedImports.set(file_10.path, false);
-                    processImportedModules(file_10);
+                    processLibReferenceDirectives(file_1);
+                    modulesWithElidedImports.set(file_1.path, false);
+                    processImportedModules(file_1);
                 }
-                else if (file_10 && modulesWithElidedImports.get(file_10.path)) {
+                // See if we need to reprocess the imports due to prior skipped imports
+                else if (file_1 && modulesWithElidedImports.get(file_1.path)) {
                     if (currentNodeModulesDepth < maxNodeModuleJsDepth) {
-                        modulesWithElidedImports.set(file_10.path, false);
-                        processImportedModules(file_10);
+                        modulesWithElidedImports.set(file_1.path, false);
+                        processImportedModules(file_1);
                     }
                 }
-                return file_10;
+                return file_1;
             }
             var redirectedPath;
             if (refFile) {
@@ -64499,9 +82265,15 @@ var ts;
                 if (redirect) {
                     (refFile.redirectedReferences || (refFile.redirectedReferences = [])).push(fileName);
                     fileName = redirect;
+                    // Once we start redirecting to a file, we can potentially come back to it
+                    // via a back-reference from another file in the .d.ts folder. If that happens we'll
+                    // end up trying to add it to the program *again* because we were tracking it via its
+                    // original (un-redirected) name. So we have to map both the original path and the redirected path
+                    // to the source file we're about to find/create
                     redirectedPath = toPath(redirect);
                 }
             }
+            // We haven't looked for this file, do so now and cache result
             var file = host.getSourceFile(fileName, options.target, function (hostErrorMessage) {
                 if (refFile !== undefined && refPos !== undefined && refEnd !== undefined) {
                     fileProcessingDiagnostics.add(ts.createFileDiagnostic(refFile, refPos, refEnd - refPos, ts.Diagnostics.Cannot_read_file_0_Colon_1, fileName, hostErrorMessage));
@@ -64514,14 +82286,17 @@ var ts;
                 var packageIdKey = ts.packageIdToString(packageId);
                 var fileFromPackageId = packageIdToSourceFile.get(packageIdKey);
                 if (fileFromPackageId) {
-                    var dupFile = createRedirectSourceFile(fileFromPackageId, file, fileName, path);
+                    // Some other SourceFile already exists with this package name and version.
+                    // Instead of creating a duplicate, just redirect to the existing one.
+                    var dupFile = createRedirectSourceFile(fileFromPackageId, file, fileName, path); // TODO: GH#18217
                     redirectTargetsSet.set(fileFromPackageId.path, true);
                     filesByName.set(path, dupFile);
                     sourceFileToPackageName.set(path, packageId.name);
-                    files.push(dupFile);
+                    processingOtherFiles.push(dupFile);
                     return dupFile;
                 }
                 else if (file) {
+                    // This is the first source file to have this packageId.
                     packageIdToSourceFile.set(packageIdKey, file);
                     sourceFileToPackageName.set(path, packageId.name);
                 }
@@ -64533,8 +82308,10 @@ var ts;
             if (file) {
                 sourceFilesFoundSearchingNodeModules.set(path, currentNodeModulesDepth > 0);
                 file.path = path;
+                file.resolvedPath = toPath(fileName);
                 if (host.useCaseSensitiveFileNames()) {
                     var pathLowerCase = path.toLowerCase();
+                    // for case-sensitive file systems check if we've already seen some file with similar filename ignoring case
                     var existingFile = filesByNameIgnoreCase.get(pathLowerCase);
                     if (existingFile) {
                         reportFileNamesDifferOnlyInCasingError(fileName, existingFile.fileName, refFile, refPos, refEnd);
@@ -64543,23 +82320,27 @@ var ts;
                         filesByNameIgnoreCase.set(pathLowerCase, file);
                     }
                 }
-                skipDefaultLib = skipDefaultLib || file.hasNoDefaultLib;
+                skipDefaultLib = skipDefaultLib || (file.hasNoDefaultLib && !ignoreNoDefaultLib);
                 if (!options.noResolve) {
                     processReferencedFiles(file, isDefaultLib);
                     processTypeReferenceDirectives(file);
                 }
+                processLibReferenceDirectives(file);
+                // always process imported modules to record module name resolutions
                 processImportedModules(file);
                 if (isDefaultLib) {
-                    files.unshift(file);
+                    processingDefaultLibFiles.push(file);
                 }
                 else {
-                    files.push(file);
+                    processingOtherFiles.push(file);
                 }
             }
             return file;
         }
         function getProjectReferenceRedirect(fileName) {
             var path = toPath(fileName);
+            // If this file is produced by a referenced project, we need to rewrite it to
+            // look in the output folder of the referenced project rather than the input
             var normalized = ts.getNormalizedAbsolutePath(fileName, path);
             var result;
             projectReferenceRedirects.forEach(function (v, k) {
@@ -64575,10 +82356,11 @@ var ts;
         function processReferencedFiles(file, isDefaultLib) {
             ts.forEach(file.referencedFiles, function (ref) {
                 var referencedFileName = resolveTripleslashReference(ref.fileName, file.fileName);
-                processSourceFile(referencedFileName, isDefaultLib, undefined, file, ref.pos, ref.end);
+                processSourceFile(referencedFileName, isDefaultLib, /*ignoreNoDefaultLib*/ false, /*packageId*/ undefined, file, ref.pos, ref.end);
             });
         }
         function processTypeReferenceDirectives(file) {
+            // We lower-case all type references because npm automatically lowercases all packages. See GH#9824.
             var typeDirectives = ts.map(file.typeReferenceDirectives, function (ref) { return ref.fileName.toLocaleLowerCase(); });
             if (!typeDirectives) {
                 return;
@@ -64587,12 +82369,14 @@ var ts;
             for (var i = 0; i < typeDirectives.length; i++) {
                 var ref = file.typeReferenceDirectives[i];
                 var resolvedTypeReferenceDirective = resolutions[i];
+                // store resolved type directive on the file
                 var fileName = ref.fileName.toLocaleLowerCase();
                 ts.setResolvedTypeReferenceDirective(file, fileName, resolvedTypeReferenceDirective);
                 processTypeReferenceDirective(fileName, resolvedTypeReferenceDirective, file, ref.pos, ref.end);
             }
         }
         function processTypeReferenceDirective(typeReferenceDirective, resolvedTypeReferenceDirective, refFile, refPos, refEnd) {
+            // If we already found this library as a primary reference - nothing to do
             var previousResolution = resolvedTypeReferenceDirectives.get(typeReferenceDirective);
             if (previousResolution && previousResolution.primary) {
                 return;
@@ -64600,30 +82384,53 @@ var ts;
             var saveResolution = true;
             if (resolvedTypeReferenceDirective) {
                 if (resolvedTypeReferenceDirective.primary) {
-                    processSourceFile(resolvedTypeReferenceDirective.resolvedFileName, false, resolvedTypeReferenceDirective.packageId, refFile, refPos, refEnd);
+                    // resolved from the primary path
+                    processSourceFile(resolvedTypeReferenceDirective.resolvedFileName, /*isDefaultLib*/ false, /*ignoreNoDefaultLib*/ false, resolvedTypeReferenceDirective.packageId, refFile, refPos, refEnd); // TODO: GH#18217
                 }
                 else {
+                    // If we already resolved to this file, it must have been a secondary reference. Check file contents
+                    // for sameness and possibly issue an error
                     if (previousResolution) {
+                        // Don't bother reading the file again if it's the same file.
                         if (resolvedTypeReferenceDirective.resolvedFileName !== previousResolution.resolvedFileName) {
                             var otherFileText = host.readFile(resolvedTypeReferenceDirective.resolvedFileName);
                             if (otherFileText !== getSourceFile(previousResolution.resolvedFileName).text) {
-                                fileProcessingDiagnostics.add(createDiagnostic(refFile, refPos, refEnd, ts.Diagnostics.Conflicting_definitions_for_0_found_at_1_and_2_Consider_installing_a_specific_version_of_this_library_to_resolve_the_conflict, typeReferenceDirective, resolvedTypeReferenceDirective.resolvedFileName, previousResolution.resolvedFileName));
+                                fileProcessingDiagnostics.add(createDiagnostic(refFile, refPos, refEnd, // TODO: GH#18217
+                                ts.Diagnostics.Conflicting_definitions_for_0_found_at_1_and_2_Consider_installing_a_specific_version_of_this_library_to_resolve_the_conflict, typeReferenceDirective, resolvedTypeReferenceDirective.resolvedFileName, previousResolution.resolvedFileName));
                             }
                         }
+                        // don't overwrite previous resolution result
                         saveResolution = false;
                     }
                     else {
-                        processSourceFile(resolvedTypeReferenceDirective.resolvedFileName, false, resolvedTypeReferenceDirective.packageId, refFile, refPos, refEnd);
+                        // First resolution of this library
+                        processSourceFile(resolvedTypeReferenceDirective.resolvedFileName, /*isDefaultLib*/ false, /*ignoreNoDefaultLib*/ false, resolvedTypeReferenceDirective.packageId, refFile, refPos, refEnd);
                     }
                 }
             }
             else {
-                fileProcessingDiagnostics.add(createDiagnostic(refFile, refPos, refEnd, ts.Diagnostics.Cannot_find_type_definition_file_for_0, typeReferenceDirective));
+                fileProcessingDiagnostics.add(createDiagnostic(refFile, refPos, refEnd, ts.Diagnostics.Cannot_find_type_definition_file_for_0, typeReferenceDirective)); // TODO: GH#18217
             }
             if (saveResolution) {
                 resolvedTypeReferenceDirectives.set(typeReferenceDirective, resolvedTypeReferenceDirective);
             }
         }
+        function processLibReferenceDirectives(file) {
+            ts.forEach(file.libReferenceDirectives, function (libReference) {
+                var libName = libReference.fileName.toLocaleLowerCase();
+                var libFileName = ts.libMap.get(libName);
+                if (libFileName) {
+                    // we ignore any 'no-default-lib' reference set on this file.
+                    processRootFile(ts.combinePaths(defaultLibraryPath, libFileName), /*isDefaultLib*/ true, /*ignoreNoDefaultLib*/ true);
+                }
+                else {
+                    var unqualifiedLibName = ts.removeSuffix(ts.removePrefix(libName, "lib."), ".d.ts");
+                    var suggestion = ts.getSpellingSuggestion(unqualifiedLibName, ts.libs, ts.identity);
+                    var message = suggestion ? ts.Diagnostics.Cannot_find_lib_definition_for_0_Did_you_mean_1 : ts.Diagnostics.Cannot_find_lib_definition_for_0;
+                    fileProcessingDiagnostics.add(createDiagnostic(file, libReference.pos, libReference.end, message, libName, suggestion));
+                }
+            });
+        }
         function createDiagnostic(refFile, refPos, refEnd, message) {
             var args = [];
             for (var _i = 4; _i < arguments.length; _i++) {
@@ -64642,6 +82449,7 @@ var ts;
         function processImportedModules(file) {
             collectExternalModuleReferences(file);
             if (file.imports.length || file.moduleAugmentations.length) {
+                // Because global augmentation doesn't have string literal name, we can check for global augmentation as such.
                 var moduleNames = getModuleNames(file);
                 var oldProgramState = { program: oldProgram, oldSourceFile: oldProgram && oldProgram.getSourceFile(file.fileName), modifiedFilePaths: modifiedFilePaths };
                 var resolutions = resolveModuleNamesReusingOldState(moduleNames, ts.getNormalizedAbsolutePath(file.fileName, currentDirectory), file, oldProgramState);
@@ -64659,21 +82467,28 @@ var ts;
                     if (isFromNodeModulesSearch) {
                         currentNodeModulesDepth++;
                     }
+                    // add file to program only if:
+                    // - resolution was successful
+                    // - noResolve is falsy
+                    // - module name comes from the list of imports
+                    // - it's not a top level JavaScript module that exceeded the search max
                     var elideImport = isJsFileFromNodeModules && currentNodeModulesDepth > maxNodeModuleJsDepth;
+                    // Don't add the file if it has a bad extension (e.g. 'tsx' if we don't have '--allowJs')
+                    // This may still end up being an untyped module -- the file won't be included but imports will be allowed.
                     var shouldAddFile = resolvedFileName
                         && !getResolutionDiagnostic(options, resolution)
                         && !options.noResolve
                         && i < file.imports.length
                         && !elideImport
                         && !(isJsFile && !options.allowJs)
-                        && (ts.isInJavaScriptFile(file.imports[i]) || !(file.imports[i].flags & 2097152));
+                        && (ts.isInJavaScriptFile(file.imports[i]) || !(file.imports[i].flags & 2097152 /* JSDoc */));
                     if (elideImport) {
                         modulesWithElidedImports.set(file.path, true);
                     }
                     else if (shouldAddFile) {
                         var path = toPath(resolvedFileName);
                         var pos = ts.skipTrivia(file.text, file.imports[i].pos);
-                        findSourceFile(resolvedFileName, path, false, file, pos, file.imports[i].end, resolution.packageId);
+                        findSourceFile(resolvedFileName, path, /*isDefaultLib*/ false, /*ignoreNoDefaultLib*/ false, file, pos, file.imports[i].end, resolution.packageId);
                     }
                     if (isFromNodeModulesSearch) {
                         currentNodeModulesDepth--;
@@ -64681,15 +82496,16 @@ var ts;
                 }
             }
             else {
+                // no imports - drop cached module resolutions
                 file.resolvedModules = undefined;
             }
         }
         function computeCommonSourceDirectory(sourceFiles) {
             var fileNames = [];
             for (var _i = 0, sourceFiles_2 = sourceFiles; _i < sourceFiles_2.length; _i++) {
-                var file_11 = sourceFiles_2[_i];
-                if (!file_11.isDeclarationFile) {
-                    fileNames.push(file_11.fileName);
+                var file = sourceFiles_2[_i];
+                if (!file.isDeclarationFile) {
+                    fileNames.push(file.fileName);
                 }
             }
             return computeCommonSourceDirectoryOfFilenames(fileNames, currentDirectory, getCanonicalFileName);
@@ -64712,23 +82528,25 @@ var ts;
             return allFilesBelongToPath;
         }
         function parseProjectReferenceConfigFile(ref) {
-            var refPath = resolveProjectReferencePath(host, ref);
+            // The actual filename (i.e. add "/tsconfig.json" if necessary)
+            var refPath = resolveProjectReferencePath(host, ref); // TODO: GH#18217
+            // An absolute path pointing to the containing directory of the config file
             var basePath = ts.getNormalizedAbsolutePath(ts.getDirectoryPath(refPath), host.getCurrentDirectory());
-            var sourceFile = host.getSourceFile(refPath, 100);
+            var sourceFile = host.getSourceFile(refPath, 100 /* JSON */);
             if (sourceFile === undefined) {
                 return undefined;
             }
-            var commandLine = ts.parseJsonSourceFileConfigFileContent(sourceFile, configParsingHost, basePath, undefined, refPath);
+            var commandLine = ts.parseJsonSourceFileConfigFileContent(sourceFile, configParsingHost, basePath, /*existingOptions*/ undefined, refPath);
             return { commandLine: commandLine, sourceFile: sourceFile };
         }
         function addProjectReferenceRedirects(referencedProject, target) {
-            var rootDir = ts.normalizePath(referencedProject.options.rootDir || ts.getDirectoryPath(referencedProject.options.configFilePath));
+            var rootDir = ts.normalizePath(referencedProject.options.rootDir || ts.getDirectoryPath(referencedProject.options.configFilePath)); // TODO: GH#18217
             target.set(rootDir, getDeclarationOutputDirectory(referencedProject));
         }
         function getDeclarationOutputDirectory(proj) {
             return proj.options.declarationDir ||
                 proj.options.outDir ||
-                ts.getDirectoryPath(proj.options.configFilePath);
+                ts.getDirectoryPath(proj.options.configFilePath); // TODO: GH#18217
         }
         function verifyCompilerOptions() {
             if (options.strictPropertyInitialization && !options.strictNullChecks) {
@@ -64787,17 +82605,18 @@ var ts;
                     }
                 }
             }
+            // List of collected files is complete; validate exhautiveness if this is a project with a file list
             if (options.composite && rootNames.length < files.length) {
                 var normalizedRootNames = rootNames.map(function (r) { return ts.normalizePath(r).toLowerCase(); });
                 var sourceFiles = files.filter(function (f) { return !f.isDeclarationFile; }).map(function (f) { return ts.normalizePath(f.path).toLowerCase(); });
-                var _loop_10 = function (file_12) {
-                    if (normalizedRootNames.every(function (r) { return r !== file_12; })) {
-                        programDiagnostics.add(ts.createCompilerDiagnostic(ts.Diagnostics.File_0_is_not_in_project_file_list_Projects_must_list_all_files_or_use_an_include_pattern, file_12));
+                var _loop_8 = function (file) {
+                    if (normalizedRootNames.every(function (r) { return r !== file; })) {
+                        programDiagnostics.add(ts.createCompilerDiagnostic(ts.Diagnostics.File_0_is_not_in_project_file_list_Projects_must_list_all_files_or_use_an_include_pattern, file));
                     }
                 };
                 for (var _i = 0, sourceFiles_4 = sourceFiles; _i < sourceFiles_4.length; _i++) {
-                    var file_12 = sourceFiles_4[_i];
-                    _loop_10(file_12);
+                    var file = sourceFiles_4[_i];
+                    _loop_8(file);
                 }
             }
             if (options.paths) {
@@ -64806,12 +82625,12 @@ var ts;
                         continue;
                     }
                     if (!ts.hasZeroOrOneAsteriskCharacter(key)) {
-                        createDiagnosticForOptionPaths(true, key, ts.Diagnostics.Pattern_0_can_have_at_most_one_Asterisk_character, key);
+                        createDiagnosticForOptionPaths(/*onKey*/ true, key, ts.Diagnostics.Pattern_0_can_have_at_most_one_Asterisk_character, key);
                     }
                     if (ts.isArray(options.paths[key])) {
                         var len = options.paths[key].length;
                         if (len === 0) {
-                            createDiagnosticForOptionPaths(false, key, ts.Diagnostics.Substitutions_for_pattern_0_shouldn_t_be_an_empty_array, key);
+                            createDiagnosticForOptionPaths(/*onKey*/ false, key, ts.Diagnostics.Substitutions_for_pattern_0_shouldn_t_be_an_empty_array, key);
                         }
                         for (var i = 0; i < len; i++) {
                             var subst = options.paths[key][i];
@@ -64827,7 +82646,7 @@ var ts;
                         }
                     }
                     else {
-                        createDiagnosticForOptionPaths(false, key, ts.Diagnostics.Substitutions_for_pattern_0_should_be_an_array, key);
+                        createDiagnosticForOptionPaths(/*onKey*/ false, key, ts.Diagnostics.Substitutions_for_pattern_0_should_be_an_array, key);
                     }
                 }
             }
@@ -64843,6 +82662,7 @@ var ts;
                 createDiagnosticForOptionName(ts.Diagnostics.Option_0_cannot_be_specified_with_option_1, "out", "outFile");
             }
             if (options.mapRoot && !(options.sourceMap || options.declarationMap)) {
+                // Error to specify --mapRoot without --sourcemap
                 createDiagnosticForOptionName(ts.Diagnostics.Option_0_cannot_be_specified_without_specifying_option_1_or_option_2, "mapRoot", "sourceMap", "declarationMap");
             }
             if (options.declarationDir) {
@@ -64862,11 +82682,11 @@ var ts;
             if (options.noImplicitUseStrict && ts.getStrictOptionValue(options, "alwaysStrict")) {
                 createDiagnosticForOptionName(ts.Diagnostics.Option_0_cannot_be_specified_with_option_1, "noImplicitUseStrict", "alwaysStrict");
             }
-            var languageVersion = options.target || 0;
+            var languageVersion = options.target || 0 /* ES3 */;
             var outFile = options.outFile || options.out;
             var firstNonAmbientExternalModuleSourceFile = ts.forEach(files, function (f) { return ts.isExternalModule(f) && !f.isDeclarationFile ? f : undefined; });
             if (options.isolatedModules) {
-                if (options.module === ts.ModuleKind.None && languageVersion < 2) {
+                if (options.module === ts.ModuleKind.None && languageVersion < 2 /* ES2015 */) {
                     createDiagnosticForOptionName(ts.Diagnostics.Option_isolatedModules_can_only_be_used_when_either_option_module_is_provided_or_option_target_is_ES2015_or_higher, "isolatedModules", "target");
                 }
                 var firstNonExternalModuleSourceFile = ts.forEach(files, function (f) { return !ts.isExternalModule(f) && !f.isDeclarationFile ? f : undefined; });
@@ -64875,10 +82695,12 @@ var ts;
                     programDiagnostics.add(ts.createFileDiagnostic(firstNonExternalModuleSourceFile, span.start, span.length, ts.Diagnostics.Cannot_compile_namespaces_when_the_isolatedModules_flag_is_provided));
                 }
             }
-            else if (firstNonAmbientExternalModuleSourceFile && languageVersion < 2 && options.module === ts.ModuleKind.None) {
+            else if (firstNonAmbientExternalModuleSourceFile && languageVersion < 2 /* ES2015 */ && options.module === ts.ModuleKind.None) {
+                // We cannot use createDiagnosticFromNode because nodes do not have parents yet
                 var span = ts.getErrorSpanForNode(firstNonAmbientExternalModuleSourceFile, firstNonAmbientExternalModuleSourceFile.externalModuleIndicator);
                 programDiagnostics.add(ts.createFileDiagnostic(firstNonAmbientExternalModuleSourceFile, span.start, span.length, ts.Diagnostics.Cannot_use_imports_exports_or_module_augmentations_when_module_is_none));
             }
+            // Cannot specify module gen that isn't amd or system with --out
             if (outFile) {
                 if (options.module && !(options.module === ts.ModuleKind.AMD || options.module === ts.ModuleKind.System)) {
                     createDiagnosticForOptionName(ts.Diagnostics.Only_amd_and_system_modules_are_supported_alongside_0, options.out ? "out" : "outFile", "module");
@@ -64893,10 +82715,14 @@ var ts;
                     createDiagnosticForOptionName(ts.Diagnostics.Option_resolveJsonModule_cannot_be_specified_without_node_module_resolution_strategy, "resolveJsonModule");
                 }
             }
-            if (options.outDir ||
-                options.sourceRoot ||
-                options.mapRoot) {
+            // there has to be common source directory if user specified --outdir || --sourceRoot
+            // if user specified --mapRoot, there needs to be common source directory if there would be multiple files being emitted
+            if (options.outDir || // there is --outDir specified
+                options.sourceRoot || // there is --sourceRoot specified
+                options.mapRoot) { // there is --mapRoot specified
+                // Precalculate and cache the common source directory
                 var dir = getCommonSourceDirectory();
+                // If we failed to find a good common directory, but outDir is specified and at least one of our files is on a windows drive/URL/other resource, add a failure
                 if (options.outDir && dir === "" && ts.forEach(files, function (file) { return ts.getRootLength(file.fileName) > 1; })) {
                     createDiagnosticForOptionName(ts.Diagnostics.Cannot_find_the_common_subdirectory_path_for_the_input_files, "outDir");
                 }
@@ -64930,6 +82756,7 @@ var ts;
             else if (options.reactNamespace && !ts.isIdentifierText(options.reactNamespace, languageVersion)) {
                 createOptionValueDiagnostic("reactNamespace", ts.Diagnostics.Invalid_value_for_reactNamespace_0_is_not_a_valid_identifier, options.reactNamespace);
             }
+            // If the emit is enabled make sure that every output file is unique and not overwriting any of the input files
             if (!options.noEmit && !options.suppressOutputPathCheck) {
                 var emitHost = getEmitHost();
                 var emitFilesSeen_1 = ts.createMap();
@@ -64940,19 +82767,24 @@ var ts;
                     verifyEmitFilePath(emitFileNames.declarationFilePath, emitFilesSeen_1);
                 });
             }
+            // Verify that all the emit files are unique and don't overwrite input files
             function verifyEmitFilePath(emitFileName, emitFilesSeen) {
                 if (emitFileName) {
                     var emitFilePath = toPath(emitFileName);
+                    // Report error if the output overwrites input file
                     if (filesByName.has(emitFilePath)) {
                         var chain_2;
                         if (!options.configFilePath) {
-                            chain_2 = ts.chainDiagnosticMessages(undefined, ts.Diagnostics.Adding_a_tsconfig_json_file_will_help_organize_projects_that_contain_both_TypeScript_and_JavaScript_files_Learn_more_at_https_Colon_Slash_Slashaka_ms_Slashtsconfig);
+                            // The program is from either an inferred project or an external project
+                            chain_2 = ts.chainDiagnosticMessages(/*details*/ undefined, ts.Diagnostics.Adding_a_tsconfig_json_file_will_help_organize_projects_that_contain_both_TypeScript_and_JavaScript_files_Learn_more_at_https_Colon_Slash_Slashaka_ms_Slashtsconfig);
                         }
                         chain_2 = ts.chainDiagnosticMessages(chain_2, ts.Diagnostics.Cannot_write_file_0_because_it_would_overwrite_input_file, emitFileName);
                         blockEmittingOfFile(emitFileName, ts.createCompilerDiagnosticFromMessageChain(chain_2));
                     }
                     var emitFileKey = !host.useCaseSensitiveFileNames() ? emitFilePath.toLocaleLowerCase() : emitFilePath;
+                    // Report error if multiple files write into same file
                     if (emitFilesSeen.has(emitFileKey)) {
+                        // Already seen the same emit file - report error
                         blockEmittingOfFile(emitFileName, ts.createCompilerDiagnostic(ts.Diagnostics.Cannot_write_file_0_because_it_would_be_overwritten_by_multiple_input_files, emitFileName));
                     }
                     else {
@@ -64987,7 +82819,7 @@ var ts;
             for (var _i = 0, pathsSyntax_2 = pathsSyntax; _i < pathsSyntax_2.length; _i++) {
                 var pathProp = pathsSyntax_2[_i];
                 if (ts.isObjectLiteralExpression(pathProp.initializer) &&
-                    createOptionDiagnosticInObjectLiteralSyntax(pathProp.initializer, onKey, key, undefined, message, arg0)) {
+                    createOptionDiagnosticInObjectLiteralSyntax(pathProp.initializer, onKey, key, /*key2*/ undefined, message, arg0)) {
                     needCompilerDiagnostic = false;
                 }
             }
@@ -65006,10 +82838,10 @@ var ts;
             return getOptionsSyntaxByName("paths") || ts.emptyArray;
         }
         function createDiagnosticForOptionName(message, option1, option2, option3) {
-            createDiagnosticForOption(true, option1, option2, message, option1, option2, option3);
+            createDiagnosticForOption(/*onKey*/ true, option1, option2, message, option1, option2, option3);
         }
         function createOptionValueDiagnostic(option1, message, arg0) {
-            createDiagnosticForOption(false, option1, undefined, message, arg0);
+            createDiagnosticForOption(/*onKey*/ false, option1, /*option2*/ undefined, message, arg0);
         }
         function createDiagnosticForReference(index, message, arg0, arg1) {
             var referencesSyntax = getProjectReferencesSyntax();
@@ -65030,9 +82862,9 @@ var ts;
         }
         function getProjectReferencesSyntax() {
             if (_referencesArrayLiteralSyntax === undefined) {
-                _referencesArrayLiteralSyntax = null;
+                _referencesArrayLiteralSyntax = null; // tslint:disable-line:no-null-keyword
                 if (options.configFile) {
-                    var jsonObjectLiteral = ts.getTsConfigObjectLiteralExpression(options.configFile);
+                    var jsonObjectLiteral = ts.getTsConfigObjectLiteralExpression(options.configFile); // TODO: GH#18217
                     for (var _i = 0, _a = ts.getPropertyAssignment(jsonObjectLiteral, "references"); _i < _a.length; _i++) {
                         var prop = _a[_i];
                         if (ts.isArrayLiteralExpression(prop.initializer)) {
@@ -65046,7 +82878,7 @@ var ts;
         }
         function getCompilerOptionsObjectLiteralSyntax() {
             if (_compilerOptionsObjectLiteralSyntax === undefined) {
-                _compilerOptionsObjectLiteralSyntax = null;
+                _compilerOptionsObjectLiteralSyntax = null; // tslint:disable-line:no-null-keyword
                 var jsonObjectLiteral = ts.getTsConfigObjectLiteralExpression(options.configFile);
                 if (jsonObjectLiteral) {
                     for (var _i = 0, _a = ts.getPropertyAssignment(jsonObjectLiteral, "compilerOptions"); _i < _a.length; _i++) {
@@ -65070,10 +82902,11 @@ var ts;
         }
         function createOptionDiagnosticInArrayLiteralSyntax(arrayLiteral, index, message, arg0, arg1, arg2) {
             if (arrayLiteral.elements.length <= index) {
+                // Out-of-bounds
                 return false;
             }
             programDiagnostics.add(ts.createDiagnosticForNodeInSourceFile(options.configFile, arrayLiteral.elements[index], message, arg0, arg1, arg2));
-            return false;
+            return false; // TODO: GH#18217 This function always returns `false`!`
         }
         function blockEmittingOfFile(emitFileName, diag) {
             hasEmitBlockingDiagnostics.set(toPath(emitFileName), true);
@@ -65083,32 +82916,38 @@ var ts;
             if (options.noEmit) {
                 return false;
             }
+            // If this is source file, its not emitted file
             var filePath = toPath(file);
             if (getSourceFileByPath(filePath)) {
                 return false;
             }
+            // If options have --outFile or --out just check that
             var out = options.outFile || options.out;
             if (out) {
-                return isSameFile(filePath, out) || isSameFile(filePath, ts.removeFileExtension(out) + ".d.ts");
+                return isSameFile(filePath, out) || isSameFile(filePath, ts.removeFileExtension(out) + ".d.ts" /* Dts */);
             }
+            // If declarationDir is specified, return if its a file in that directory
             if (options.declarationDir && ts.containsPath(options.declarationDir, filePath, currentDirectory, !host.useCaseSensitiveFileNames())) {
                 return true;
             }
+            // If --outDir, check if file is in that directory
             if (options.outDir) {
                 return ts.containsPath(options.outDir, filePath, currentDirectory, !host.useCaseSensitiveFileNames());
             }
-            if (ts.fileExtensionIsOneOf(filePath, ts.supportedJavascriptExtensions) || ts.fileExtensionIs(filePath, ".d.ts")) {
+            if (ts.fileExtensionIsOneOf(filePath, ts.supportedJavascriptExtensions) || ts.fileExtensionIs(filePath, ".d.ts" /* Dts */)) {
+                // Otherwise just check if sourceFile with the name exists
                 var filePathWithoutExtension = ts.removeFileExtension(filePath);
-                return !!getSourceFileByPath((filePathWithoutExtension + ".ts")) ||
-                    !!getSourceFileByPath((filePathWithoutExtension + ".tsx"));
+                return !!getSourceFileByPath((filePathWithoutExtension + ".ts" /* Ts */)) ||
+                    !!getSourceFileByPath((filePathWithoutExtension + ".tsx" /* Tsx */));
             }
             return false;
         }
         function isSameFile(file1, file2) {
-            return ts.comparePaths(file1, file2, currentDirectory, !host.useCaseSensitiveFileNames()) === 0;
+            return ts.comparePaths(file1, file2, currentDirectory, !host.useCaseSensitiveFileNames()) === 0 /* EqualTo */;
         }
     }
     ts.createProgram = createProgram;
+    /* @internal */
     function parseConfigHostFromCompilerHost(host) {
         return {
             fileExists: function (f) { return host.fileExists(f); },
@@ -65120,24 +82959,35 @@ var ts;
         };
     }
     ts.parseConfigHostFromCompilerHost = parseConfigHostFromCompilerHost;
+    /**
+     * Returns the target config filename of a project reference
+     */
     function resolveProjectReferencePath(host, ref) {
         if (!host.fileExists(ref.path)) {
             return ts.combinePaths(ref.path, "tsconfig.json");
         }
         return ref.path;
     }
+    ts.resolveProjectReferencePath = resolveProjectReferencePath;
+    /* @internal */
+    /**
+     * Returns a DiagnosticMessage if we won't include a resolved module due to its extension.
+     * The DiagnosticMessage's parameters are the imported module name, and the filename it resolved to.
+     * This returns a diagnostic even if the module will be an untyped module.
+     */
     function getResolutionDiagnostic(options, _a) {
         var extension = _a.extension;
         switch (extension) {
-            case ".ts":
-            case ".d.ts":
-            case ".json":
+            case ".ts" /* Ts */:
+            case ".d.ts" /* Dts */:
+            case ".json" /* Json */: // Since module is resolved to json file only when --resolveJsonModule, we dont need further check
+                // These are always allowed.
                 return undefined;
-            case ".tsx":
+            case ".tsx" /* Tsx */:
                 return needJsx();
-            case ".jsx":
+            case ".jsx" /* Jsx */:
                 return needJsx() || needAllowJs();
-            case ".js":
+            case ".js" /* Js */:
                 return needAllowJs();
         }
         function needJsx() {
@@ -65153,13 +83003,15 @@ var ts;
         var res = imports.map(function (i) { return i.text; });
         for (var _i = 0, moduleAugmentations_1 = moduleAugmentations; _i < moduleAugmentations_1.length; _i++) {
             var aug = moduleAugmentations_1[_i];
-            if (aug.kind === 9) {
+            if (aug.kind === 9 /* StringLiteral */) {
                 res.push(aug.text);
             }
+            // Do nothing if it's an Identifier; we don't need to do module resolution for `declare global`.
         }
         return res;
     }
 })(ts || (ts = {}));
+/*@internal*/
 var ts;
 (function (ts) {
     function getFileEmitOutput(program, sourceFile, emitOnlyDtsFiles, cancellationToken, customTransformers) {
@@ -65172,11 +83024,18 @@ var ts;
     }
     ts.getFileEmitOutput = getFileEmitOutput;
 })(ts || (ts = {}));
+/*@internal*/
 (function (ts) {
     var BuilderState;
     (function (BuilderState) {
+        /**
+         * Gets the referenced files for a file from the program with values for the keys as referenced file's path to be true
+         */
         function getReferencedFiles(program, sourceFile, getCanonicalFileName) {
             var referencedFiles;
+            // We need to use a set here since the code can contain the same import twice,
+            // but that will only be one dependency.
+            // To avoid invernal conversion, the key of the referencedFiles map must be of type Path
             if (sourceFile.imports && sourceFile.imports.length > 0) {
                 var checker = program.getTypeChecker();
                 for (var _i = 0, _a = sourceFile.imports; _i < _a.length; _i++) {
@@ -65191,6 +83050,7 @@ var ts;
                 }
             }
             var sourceFileDirectory = ts.getDirectoryPath(sourceFile.path);
+            // Handle triple slash references
             if (sourceFile.referencedFiles && sourceFile.referencedFiles.length > 0) {
                 for (var _b = 0, _c = sourceFile.referencedFiles; _b < _c.length; _b++) {
                     var referencedFile = _c[_b];
@@ -65198,12 +83058,13 @@ var ts;
                     addReferencedFile(referencedPath);
                 }
             }
+            // Handle type reference directives
             if (sourceFile.resolvedTypeReferenceDirectiveNames) {
                 sourceFile.resolvedTypeReferenceDirectiveNames.forEach(function (resolvedTypeReferenceDirective) {
                     if (!resolvedTypeReferenceDirective) {
                         return;
                     }
-                    var fileName = resolvedTypeReferenceDirective.resolvedFileName;
+                    var fileName = resolvedTypeReferenceDirective.resolvedFileName; // TODO: GH#18217
                     var typeFilePath = ts.toPath(fileName, sourceFileDirectory, getCanonicalFileName);
                     addReferencedFile(typeFilePath);
                 });
@@ -65216,15 +83077,22 @@ var ts;
                 referencedFiles.set(referencedPath, true);
             }
         }
+        /**
+         * Returns true if oldState is reusable, that is the emitKind = module/non module has not changed
+         */
         function canReuseOldState(newReferencedMap, oldState) {
             return oldState && !oldState.referencedMap === !newReferencedMap;
         }
         BuilderState.canReuseOldState = canReuseOldState;
+        /**
+         * Creates the state of file references and signature for the new program from oldState if it is safe
+         */
         function create(newProgram, getCanonicalFileName, oldState) {
             var fileInfos = ts.createMap();
             var referencedMap = newProgram.getCompilerOptions().module !== ts.ModuleKind.None ? ts.createMap() : undefined;
             var hasCalledUpdateShapeSignature = ts.createMap();
             var useOldState = canReuseOldState(referencedMap, oldState);
+            // Create the reference map, and set the file infos
             for (var _i = 0, _a = newProgram.getSourceFiles(); _i < _a.length; _i++) {
                 var sourceFile = _a[_i];
                 var version_1 = sourceFile.version;
@@ -65246,7 +83114,14 @@ var ts;
             };
         }
         BuilderState.create = create;
+        /**
+         * Gets the files affected by the path from the program
+         */
         function getFilesAffectedBy(state, programOfThisState, path, cancellationToken, computeHash, cacheToUpdateSignature) {
+            // Since the operation could be cancelled, the signatures are always stored in the cache
+            // They will be commited once it is safe to use them
+            // eg when calling this api from tsserver, if there is no cancellation of the operation
+            // In the other cases the affected files signatures are commited only after the iteration through the result is complete
             var signatureCache = cacheToUpdateSignature || ts.createMap();
             var sourceFile = programOfThisState.getSourceFileByPath(path);
             if (!sourceFile) {
@@ -65257,11 +83132,16 @@ var ts;
             }
             var result = (state.referencedMap ? getFilesAffectedByUpdatedShapeWhenModuleEmit : getFilesAffectedByUpdatedShapeWhenNonModuleEmit)(state, programOfThisState, sourceFile, signatureCache, cancellationToken, computeHash);
             if (!cacheToUpdateSignature) {
+                // Commit all the signatures in the signature cache
                 updateSignaturesFromCache(state, signatureCache);
             }
             return result;
         }
         BuilderState.getFilesAffectedBy = getFilesAffectedBy;
+        /**
+         * Updates the signatures from the cache into state's fileinfo signatures
+         * This should be called whenever it is safe to commit the state of the builder
+         */
         function updateSignaturesFromCache(state, signatureCache) {
             signatureCache.forEach(function (signature, path) {
                 state.fileInfos.get(path).signature = signature;
@@ -65269,8 +83149,12 @@ var ts;
             });
         }
         BuilderState.updateSignaturesFromCache = updateSignaturesFromCache;
+        /**
+         * Returns if the shape of the signature has changed since last emit
+         */
         function updateShapeSignature(state, programOfThisState, sourceFile, cacheToUpdateSignature, cancellationToken, computeHash) {
             ts.Debug.assert(!!sourceFile);
+            // If we have cached the result for this file, that means hence forth we should assume file shape is uptodate
             if (state.hasCalledUpdateShapeSignature.has(sourceFile.path) || cacheToUpdateSignature.has(sourceFile.path)) {
                 return false;
             }
@@ -65283,26 +83167,32 @@ var ts;
                 latestSignature = sourceFile.version;
             }
             else {
-                var emitOutput = ts.getFileEmitOutput(programOfThisState, sourceFile, true, cancellationToken);
+                var emitOutput = ts.getFileEmitOutput(programOfThisState, sourceFile, /*emitOnlyDtsFiles*/ true, cancellationToken);
                 if (emitOutput.outputFiles && emitOutput.outputFiles.length > 0) {
                     latestSignature = computeHash(emitOutput.outputFiles[0].text);
                 }
                 else {
-                    latestSignature = prevSignature;
+                    latestSignature = prevSignature; // TODO: GH#18217
                 }
             }
             cacheToUpdateSignature.set(sourceFile.path, latestSignature);
             return !prevSignature || latestSignature !== prevSignature;
         }
+        /**
+         * Get all the dependencies of the sourceFile
+         */
         function getAllDependencies(state, programOfThisState, sourceFile) {
             var _a;
             var compilerOptions = programOfThisState.getCompilerOptions();
+            // With --out or --outFile all outputs go into single file, all files depend on each other
             if (compilerOptions.outFile || compilerOptions.out) {
                 return getAllFileNames(state, programOfThisState);
             }
+            // If this is non module emit, or its a global file, it depends on all the source files
             if (!state.referencedMap || (!ts.isExternalModule(sourceFile) && !containsOnlyAmbientModules(sourceFile))) {
                 return getAllFileNames(state, programOfThisState);
             }
+            // Get the references, traversing deep from the referenceMap
             var seenMap = ts.createMap();
             var queue = [sourceFile.path];
             while (queue.length) {
@@ -65324,6 +83214,9 @@ var ts;
             }));
         }
         BuilderState.getAllDependencies = getAllDependencies;
+        /**
+         * Gets the names of all files from the program
+         */
         function getAllFileNames(state, programOfThisState) {
             if (!state.allFileNames) {
                 var sourceFiles = programOfThisState.getSourceFiles();
@@ -65331,12 +83224,21 @@ var ts;
             }
             return state.allFileNames;
         }
+        /**
+         * Gets the files referenced by the the file path
+         */
         function getReferencedByPaths(state, referencedFilePath) {
             return ts.arrayFrom(ts.mapDefinedIterator(state.referencedMap.entries(), function (_a) {
                 var filePath = _a[0], referencesInFile = _a[1];
                 return referencesInFile.has(referencedFilePath) ? filePath : undefined;
             }));
         }
+        /**
+         * For script files that contains only ambient external modules, although they are not actually external module files,
+         * they can only be consumed via importing elements from them. Regular script files cannot consume them. Therefore,
+         * there are no point to rebuild all script files if these special files have changed. However, if any statement
+         * in the file is not ambient external module, we treat it as a regular script file.
+         */
         function containsOnlyAmbientModules(sourceFile) {
             for (var _i = 0, _a = sourceFile.statements; _i < _a.length; _i++) {
                 var statement = _a[_i];
@@ -65346,7 +83248,11 @@ var ts;
             }
             return true;
         }
+        /**
+         * Gets all files of the program excluding the default library file
+         */
         function getAllFilesExcludingDefaultLibraryFile(state, programOfThisState, firstSourceFile) {
+            // Use cached result
             if (state.allFilesExcludingDefaultLibraryFile) {
                 return state.allFilesExcludingDefaultLibraryFile;
             }
@@ -65366,13 +83272,21 @@ var ts;
                 }
             }
         }
+        /**
+         * When program emits non modular code, gets the files affected by the sourceFile whose shape has changed
+         */
         function getFilesAffectedByUpdatedShapeWhenNonModuleEmit(state, programOfThisState, sourceFileWithUpdatedShape) {
             var compilerOptions = programOfThisState.getCompilerOptions();
+            // If `--out` or `--outFile` is specified, any new emit will result in re-emitting the entire project,
+            // so returning the file itself is good enough.
             if (compilerOptions && (compilerOptions.out || compilerOptions.outFile)) {
                 return [sourceFileWithUpdatedShape];
             }
             return getAllFilesExcludingDefaultLibraryFile(state, programOfThisState, sourceFileWithUpdatedShape);
         }
+        /**
+         * When program emits modular code, gets the files affected by the sourceFile whose shape has changed
+         */
         function getFilesAffectedByUpdatedShapeWhenModuleEmit(state, programOfThisState, sourceFileWithUpdatedShape, cacheToUpdateSignature, cancellationToken, computeHash) {
             if (!ts.isExternalModule(sourceFileWithUpdatedShape) && !containsOnlyAmbientModules(sourceFileWithUpdatedShape)) {
                 return getAllFilesExcludingDefaultLibraryFile(state, programOfThisState, sourceFileWithUpdatedShape);
@@ -65381,7 +83295,11 @@ var ts;
             if (compilerOptions && (compilerOptions.isolatedModules || compilerOptions.out || compilerOptions.outFile)) {
                 return [sourceFileWithUpdatedShape];
             }
+            // Now we need to if each file in the referencedBy list has a shape change as well.
+            // Because if so, its own referencedBy files need to be saved as well to make the
+            // emitting result consistent with files on disk.
             var seenFileNamesMap = ts.createMap();
+            // Start with the paths this file was referenced by
             seenFileNamesMap.set(sourceFileWithUpdatedShape.path, sourceFileWithUpdatedShape);
             var queue = getReferencedByPaths(state, sourceFileWithUpdatedShape.path);
             while (queue.length > 0) {
@@ -65389,20 +83307,28 @@ var ts;
                 if (!seenFileNamesMap.has(currentPath)) {
                     var currentSourceFile = programOfThisState.getSourceFileByPath(currentPath);
                     seenFileNamesMap.set(currentPath, currentSourceFile);
-                    if (currentSourceFile && updateShapeSignature(state, programOfThisState, currentSourceFile, cacheToUpdateSignature, cancellationToken, computeHash)) {
-                        queue.push.apply(queue, getReferencedByPaths(state, currentPath));
+                    if (currentSourceFile && updateShapeSignature(state, programOfThisState, currentSourceFile, cacheToUpdateSignature, cancellationToken, computeHash)) { // TODO: GH#18217
+                        queue.push.apply(// TODO: GH#18217
+                        queue, getReferencedByPaths(state, currentPath));
                     }
                 }
             }
+            // Return array of values that needs emit
+            // Return array of values that needs emit
             return ts.arrayFrom(ts.mapDefinedIterator(seenFileNamesMap.values(), function (value) { return value; }));
         }
     })(BuilderState = ts.BuilderState || (ts.BuilderState = {}));
 })(ts || (ts = {}));
+/*@internal*/
 var ts;
 (function (ts) {
     function hasSameKeys(map1, map2) {
+        // Has same size and every key is present in both maps
         return map1 === map2 || map1 !== undefined && map2 !== undefined && map1.size === map2.size && !ts.forEachKey(map1, function (key) { return !map2.has(key); });
     }
+    /**
+     * Create the state so that we can iterate on changedFiles/affected files
+     */
     function createBuilderProgramState(newProgram, getCanonicalFileName, oldState) {
         var state = ts.BuilderState.create(newProgram, getCanonicalFileName, oldState);
         state.program = newProgram;
@@ -65414,27 +83340,37 @@ var ts;
         var useOldState = ts.BuilderState.canReuseOldState(state.referencedMap, oldState);
         var canCopySemanticDiagnostics = useOldState && oldState.semanticDiagnosticsPerFile && !!state.semanticDiagnosticsPerFile;
         if (useOldState) {
+            // Verify the sanity of old state
             if (!oldState.currentChangedFilePath) {
                 ts.Debug.assert(!oldState.affectedFiles && (!oldState.currentAffectedFilesSignatures || !oldState.currentAffectedFilesSignatures.size), "Cannot reuse if only few affected files of currentChangedFile were iterated");
             }
             if (canCopySemanticDiagnostics) {
                 ts.Debug.assert(!ts.forEachKey(oldState.changedFilesSet, function (path) { return oldState.semanticDiagnosticsPerFile.has(path); }), "Semantic diagnostics shouldnt be available for changed files");
             }
+            // Copy old state's changed files set
             ts.copyEntries(oldState.changedFilesSet, state.changedFilesSet);
         }
+        // Update changed files and copy semantic diagnostics if we can
         var referencedMap = state.referencedMap;
         var oldReferencedMap = useOldState ? oldState.referencedMap : undefined;
         state.fileInfos.forEach(function (info, sourceFilePath) {
             var oldInfo;
             var newReferences;
+            // if not using old state, every file is changed
             if (!useOldState ||
+                // File wasnt present in old state
                 !(oldInfo = oldState.fileInfos.get(sourceFilePath)) ||
+                // versions dont match
                 oldInfo.version !== info.version ||
+                // Referenced files changed
                 !hasSameKeys(newReferences = referencedMap && referencedMap.get(sourceFilePath), oldReferencedMap && oldReferencedMap.get(sourceFilePath)) ||
+                // Referenced file was deleted in the new program
                 newReferences && ts.forEachKey(newReferences, function (path) { return !state.fileInfos.has(path) && oldState.fileInfos.has(path); })) {
+                // Register file as changed file and do not copy semantic diagnostics, since all changed files need to be re-evaluated
                 state.changedFilesSet.set(sourceFilePath, true);
             }
             else if (canCopySemanticDiagnostics) {
+                // Unchanged file copy diagnostics
                 var diagnostics = oldState.semanticDiagnosticsPerFile.get(sourceFilePath);
                 if (diagnostics) {
                     state.semanticDiagnosticsPerFile.set(sourceFilePath, diagnostics);
@@ -65443,18 +83379,28 @@ var ts;
         });
         return state;
     }
+    /**
+     * Verifies that source file is ok to be used in calls that arent handled by next
+     */
     function assertSourceFileOkWithoutNextAffectedCall(state, sourceFile) {
         ts.Debug.assert(!sourceFile || !state.affectedFiles || state.affectedFiles[state.affectedFilesIndex - 1] !== sourceFile || !state.semanticDiagnosticsPerFile.has(sourceFile.path));
     }
+    /**
+     * This function returns the next affected file to be processed.
+     * Note that until doneAffected is called it would keep reporting same result
+     * This is to allow the callers to be able to actually remove affected file only when the operation is complete
+     * eg. if during diagnostics check cancellation token ends up cancelling the request, the affected file should be retained
+     */
     function getNextAffectedFile(state, cancellationToken, computeHash) {
         while (true) {
             var affectedFiles = state.affectedFiles;
             if (affectedFiles) {
                 var seenAffectedFiles = state.seenAffectedFiles, semanticDiagnosticsPerFile = state.semanticDiagnosticsPerFile;
-                var affectedFilesIndex = state.affectedFilesIndex;
+                var affectedFilesIndex = state.affectedFilesIndex; // TODO: GH#18217
                 while (affectedFilesIndex < affectedFiles.length) {
                     var affectedFile = affectedFiles[affectedFilesIndex];
                     if (!seenAffectedFiles.has(affectedFile.path)) {
+                        // Set the next affected file as seen and remove the cached semantic diagnostics
                         state.affectedFilesIndex = affectedFilesIndex;
                         semanticDiagnosticsPerFile.delete(affectedFile.path);
                         return affectedFile;
@@ -65462,21 +83408,28 @@ var ts;
                     seenAffectedFiles.set(affectedFile.path, true);
                     affectedFilesIndex++;
                 }
+                // Remove the changed file from the change set
                 state.changedFilesSet.delete(state.currentChangedFilePath);
                 state.currentChangedFilePath = undefined;
+                // Commit the changes in file signature
                 ts.BuilderState.updateSignaturesFromCache(state, state.currentAffectedFilesSignatures);
                 state.currentAffectedFilesSignatures.clear();
                 state.affectedFiles = undefined;
             }
+            // Get next changed file
             var nextKey = state.changedFilesSet.keys().next();
             if (nextKey.done) {
+                // Done
                 return undefined;
             }
+            // With --out or --outFile all outputs go into single file
+            // so operations are performed directly on program, return program
             var compilerOptions = state.program.getCompilerOptions();
             if (compilerOptions.outFile || compilerOptions.out) {
                 ts.Debug.assert(!state.semanticDiagnosticsPerFile);
                 return state.program;
             }
+            // Get next batch of affected files
             state.currentAffectedFilesSignatures = state.currentAffectedFilesSignatures || ts.createMap();
             state.affectedFiles = ts.BuilderState.getFilesAffectedBy(state, state.program, nextKey.value, cancellationToken, computeHash, state.currentAffectedFilesSignatures);
             state.currentChangedFilePath = nextKey.value;
@@ -65485,6 +83438,10 @@ var ts;
             state.seenAffectedFiles = state.seenAffectedFiles || ts.createMap();
         }
     }
+    /**
+     * This is called after completing operation on the next affected file.
+     * The operations here are postponed to ensure that cancellation during the iteration is handled correctly
+     */
     function doneWithAffectedFile(state, affected) {
         if (affected === state.program) {
             state.changedFilesSet.clear();
@@ -65494,16 +83451,25 @@ var ts;
             state.affectedFilesIndex++;
         }
     }
+    /**
+     * Returns the result with affected file
+     */
     function toAffectedFileResult(state, result, affected) {
         doneWithAffectedFile(state, affected);
         return { result: result, affected: affected };
     }
+    /**
+     * Gets the semantic diagnostics either from cache if present, or otherwise from program and caches it
+     * Note that it is assumed that the when asked about semantic diagnostics, the file has been taken out of affected files/changed file set
+     */
     function getSemanticDiagnosticsOfFile(state, sourceFile, cancellationToken) {
         var path = sourceFile.path;
         var cachedDiagnostics = state.semanticDiagnosticsPerFile.get(path);
+        // Report the semantic diagnostics from the cache if we already have those diagnostics present
         if (cachedDiagnostics) {
             return cachedDiagnostics;
         }
+        // Diagnostics werent cached, get them from program, and cache the result
         var diagnostics = state.program.getSemanticDiagnostics(sourceFile, cancellationToken);
         state.semanticDiagnosticsPerFile.set(path, diagnostics);
         return diagnostics;
@@ -65540,16 +83506,24 @@ var ts;
     ts.getBuilderCreationParameters = getBuilderCreationParameters;
     function createBuilderProgram(kind, _a) {
         var newProgram = _a.newProgram, host = _a.host, oldProgram = _a.oldProgram, configFileParsingDiagnostics = _a.configFileParsingDiagnostics;
+        // Return same program if underlying program doesnt change
         var oldState = oldProgram && oldProgram.getState();
         if (oldState && newProgram === oldState.program && configFileParsingDiagnostics === newProgram.getConfigFileParsingDiagnostics()) {
-            newProgram = undefined;
+            newProgram = undefined; // TODO: GH#18217
             oldState = undefined;
             return oldProgram;
         }
+        /**
+         * Create the canonical file name for identity
+         */
         var getCanonicalFileName = ts.createGetCanonicalFileName(host.useCaseSensitiveFileNames());
+        /**
+         * Computing hash to for signature verification
+         */
         var computeHash = host.createHash || ts.identity;
         var state = createBuilderProgramState(newProgram, getCanonicalFileName, oldState);
-        newProgram = undefined;
+        // To ensure that we arent storing any references to old program or new program without state
+        newProgram = undefined; // TODO: GH#18217
         oldProgram = undefined;
         oldState = undefined;
         var result = {
@@ -65577,17 +83551,38 @@ var ts;
             ts.notImplemented();
         }
         return result;
+        /**
+         * Emits the next affected file's emit result (EmitResult and sourceFiles emitted) or returns undefined if iteration is complete
+         * The first of writeFile if provided, writeFile of BuilderProgramHost if provided, writeFile of compiler host
+         * in that order would be used to write the files
+         */
         function emitNextAffectedFile(writeFile, cancellationToken, emitOnlyDtsFiles, customTransformers) {
             var affected = getNextAffectedFile(state, cancellationToken, computeHash);
             if (!affected) {
+                // Done
                 return undefined;
             }
-            return toAffectedFileResult(state, state.program.emit(affected === state.program ? undefined : affected, writeFile || host.writeFile, cancellationToken, emitOnlyDtsFiles, customTransformers), affected);
+            return toAffectedFileResult(state, 
+            // When whole program is affected, do emit only once (eg when --out or --outFile is specified)
+            // Otherwise just affected file
+            state.program.emit(affected === state.program ? undefined : affected, writeFile || host.writeFile, cancellationToken, emitOnlyDtsFiles, customTransformers), affected);
         }
+        /**
+         * Emits the JavaScript and declaration files.
+         * When targetSource file is specified, emits the files corresponding to that source file,
+         * otherwise for the whole program.
+         * In case of EmitAndSemanticDiagnosticsBuilderProgram, when targetSourceFile is specified,
+         * it is assumed that that file is handled from affected file list. If targetSourceFile is not specified,
+         * it will only emit all the affected files instead of whole program
+         *
+         * The first of writeFile if provided, writeFile of BuilderProgramHost if provided, writeFile of compiler host
+         * in that order would be used to write the files
+         */
         function emit(targetSourceFile, writeFile, cancellationToken, emitOnlyDtsFiles, customTransformers) {
             if (kind === BuilderProgramKind.EmitAndSemanticDiagnosticsBuilderProgram) {
                 assertSourceFileOkWithoutNextAffectedCall(state, targetSourceFile);
                 if (!targetSourceFile) {
+                    // Emit and report any errors we ran into.
                     var sourceMaps = [];
                     var emitSkipped = false;
                     var diagnostics = void 0;
@@ -65609,33 +83604,52 @@ var ts;
             }
             return state.program.emit(targetSourceFile, writeFile || host.writeFile, cancellationToken, emitOnlyDtsFiles, customTransformers);
         }
+        /**
+         * Return the semantic diagnostics for the next affected file or undefined if iteration is complete
+         * If provided ignoreSourceFile would be called before getting the diagnostics and would ignore the sourceFile if the returned value was true
+         */
         function getSemanticDiagnosticsOfNextAffectedFile(cancellationToken, ignoreSourceFile) {
             while (true) {
                 var affected = getNextAffectedFile(state, cancellationToken, computeHash);
                 if (!affected) {
+                    // Done
                     return undefined;
                 }
                 else if (affected === state.program) {
-                    return toAffectedFileResult(state, state.program.getSemanticDiagnostics(undefined, cancellationToken), affected);
+                    // When whole program is affected, get all semantic diagnostics (eg when --out or --outFile is specified)
+                    return toAffectedFileResult(state, state.program.getSemanticDiagnostics(/*targetSourceFile*/ undefined, cancellationToken), affected);
                 }
+                // Get diagnostics for the affected file if its not ignored
                 if (ignoreSourceFile && ignoreSourceFile(affected)) {
+                    // Get next affected file
                     doneWithAffectedFile(state, affected);
                     continue;
                 }
                 return toAffectedFileResult(state, getSemanticDiagnosticsOfFile(state, affected, cancellationToken), affected);
             }
         }
+        /**
+         * Gets the semantic diagnostics from the program corresponding to this state of file (if provided) or whole program
+         * The semantic diagnostics are cached and managed here
+         * Note that it is assumed that when asked about semantic diagnostics through this API,
+         * the file has been taken out of affected files so it is safe to use cache or get from program and cache the diagnostics
+         * In case of SemanticDiagnosticsBuilderProgram if the source file is not provided,
+         * it will iterate through all the affected files, to ensure that cache stays valid and yet provide a way to get all semantic diagnostics
+         */
         function getSemanticDiagnostics(sourceFile, cancellationToken) {
             assertSourceFileOkWithoutNextAffectedCall(state, sourceFile);
             var compilerOptions = state.program.getCompilerOptions();
             if (compilerOptions.outFile || compilerOptions.out) {
                 ts.Debug.assert(!state.semanticDiagnosticsPerFile);
+                // We dont need to cache the diagnostics just return them from program
                 return state.program.getSemanticDiagnostics(sourceFile, cancellationToken);
             }
             if (sourceFile) {
                 return getSemanticDiagnosticsOfFile(state, sourceFile, cancellationToken);
             }
             if (kind === BuilderProgramKind.SemanticDiagnosticsBuilderProgram) {
+                // When semantic builder asks for diagnostics of the whole program,
+                // ensure that all the affected files are handled
                 var affected = void 0;
                 while (affected = getNextAffectedFile(state, cancellationToken, computeHash)) {
                     doneWithAffectedFile(state, affected);
@@ -65663,6 +83677,7 @@ var ts;
     function createAbstractBuilder(newProgramOrRootNames, hostOrOptions, oldProgramOrHost, configFileParsingDiagnosticsOrOldProgram, configFileParsingDiagnostics) {
         var program = ts.getBuilderCreationParameters(newProgramOrRootNames, hostOrOptions, oldProgramOrHost, configFileParsingDiagnosticsOrOldProgram, configFileParsingDiagnostics).newProgram;
         return {
+            // Only return program, all other methods are not implemented
             getProgram: function () { return program; },
             getState: ts.notImplemented,
             getCompilerOptions: ts.notImplemented,
@@ -65680,6 +83695,7 @@ var ts;
     }
     ts.createAbstractBuilder = createAbstractBuilder;
 })(ts || (ts = {}));
+/*@internal*/
 var ts;
 (function (ts) {
     ts.maxNumberOfFilesToIterateForInvalidation = 256;
@@ -65688,23 +83704,35 @@ var ts;
         var filesWithInvalidatedResolutions;
         var filesWithInvalidatedNonRelativeUnresolvedImports;
         var allFilesHaveInvalidatedResolution = false;
-        var getCurrentDirectory = ts.memoize(function () { return resolutionHost.getCurrentDirectory(); });
+        var getCurrentDirectory = ts.memoize(function () { return resolutionHost.getCurrentDirectory(); }); // TODO: GH#18217
         var cachedDirectoryStructureHost = resolutionHost.getCachedDirectoryStructureHost();
+        // The resolvedModuleNames and resolvedTypeReferenceDirectives are the cache of resolutions per file.
+        // The key in the map is source file's path.
+        // The values are Map of resolutions with key being name lookedup.
         var resolvedModuleNames = ts.createMap();
         var perDirectoryResolvedModuleNames = ts.createMap();
         var nonRelaticeModuleNameCache = ts.createMap();
         var moduleResolutionCache = ts.createModuleResolutionCacheWithMaps(perDirectoryResolvedModuleNames, nonRelaticeModuleNameCache, getCurrentDirectory(), resolutionHost.getCanonicalFileName);
         var resolvedTypeReferenceDirectives = ts.createMap();
         var perDirectoryResolvedTypeReferenceDirectives = ts.createMap();
-        var failedLookupDefaultExtensions = [".ts", ".tsx", ".js", ".jsx", ".json"];
+        /**
+         * These are the extensions that failed lookup files will have by default,
+         * any other extension of failed lookup will be store that path in custom failed lookup path
+         * This helps in not having to comb through all resolutions when files are added/removed
+         * Note that .d.ts file also has .d.ts extension hence will be part of default extensions
+         */
+        var failedLookupDefaultExtensions = [".ts" /* Ts */, ".tsx" /* Tsx */, ".js" /* Js */, ".jsx" /* Jsx */, ".json" /* Json */];
         var customFailedLookupPaths = ts.createMap();
         var directoryWatchesOfFailedLookups = ts.createMap();
         var rootDir = rootDirForResolution && ts.removeTrailingDirectorySeparator(ts.getNormalizedAbsolutePath(rootDirForResolution, getCurrentDirectory()));
-        var rootPath = (rootDir && resolutionHost.toPath(rootDir));
+        var rootPath = (rootDir && resolutionHost.toPath(rootDir)); // TODO: GH#18217
+        // TypeRoot watches for the types that get added as part of getAutomaticTypeDirectiveNames
         var typeRootsWatches = ts.createMap();
         return {
             startRecordingFilesWithChangedResolutions: startRecordingFilesWithChangedResolutions,
             finishRecordingFilesWithChangedResolutions: finishRecordingFilesWithChangedResolutions,
+            // perDirectoryResolvedModuleNames and perDirectoryResolvedTypeReferenceDirectives could be non empty if there was exception during program update
+            // (between startCachingPerDirectoryResolution and finishCachingPerDirectoryResolution)
             startCachingPerDirectoryResolution: clearPerDirectoryResolutions,
             finishCachingPerDirectoryResolution: finishCachingPerDirectoryResolution,
             resolveModuleNames: resolveModuleNames,
@@ -65737,6 +83765,8 @@ var ts;
             resolvedModuleNames.clear();
             resolvedTypeReferenceDirectives.clear();
             allFilesHaveInvalidatedResolution = false;
+            // perDirectoryResolvedModuleNames and perDirectoryResolvedTypeReferenceDirectives could be non empty if there was exception during program update
+            // (between startCachingPerDirectoryResolution and finishCachingPerDirectoryResolution)
             clearPerDirectoryResolutions();
         }
         function startRecordingFilesWithChangedResolutions() {
@@ -65751,11 +83781,13 @@ var ts;
             if (!filesWithInvalidatedNonRelativeUnresolvedImports) {
                 return false;
             }
+            // Invalidated if file has unresolved imports
             var value = filesWithInvalidatedNonRelativeUnresolvedImports.get(path);
             return !!value && !!value.length;
         }
         function createHasInvalidatedResolution(forceAllFilesAsInvalidated) {
             if (allFilesHaveInvalidatedResolution || forceAllFilesAsInvalidated) {
+                // Any file asked would have invalidated resolution
                 filesWithInvalidatedResolutions = undefined;
                 return ts.returnTrue;
             }
@@ -65782,16 +83814,21 @@ var ts;
         }
         function resolveModuleName(moduleName, containingFile, compilerOptions, host) {
             var primaryResult = ts.resolveModuleName(moduleName, containingFile, compilerOptions, host, moduleResolutionCache);
+            // return result immediately only if global cache support is not enabled or if it is .ts, .tsx or .d.ts
             if (!resolutionHost.getGlobalCache) {
                 return primaryResult;
             }
+            // otherwise try to load typings from @types
             var globalCache = resolutionHost.getGlobalCache();
             if (globalCache !== undefined && !ts.isExternalModuleNameRelative(moduleName) && !(primaryResult.resolvedModule && ts.extensionIsTypeScript(primaryResult.resolvedModule.extension))) {
+                // create different collection of failed lookup locations for second pass
+                // if it will fail and we've already found something during the first pass - we don't want to pollute its results
                 var _a = ts.loadModuleFromGlobalCache(moduleName, resolutionHost.projectName, compilerOptions, host, globalCache), resolvedModule = _a.resolvedModule, failedLookupLocations = _a.failedLookupLocations;
                 if (resolvedModule) {
                     return { resolvedModule: resolvedModule, failedLookupLocations: ts.addRange(primaryResult.failedLookupLocations, failedLookupLocations) };
                 }
             }
+            // Default return the result from the first pass
             return primaryResult;
         }
         function resolveNamesWithLocalCache(names, containingFile, cache, perDirectoryCache, loader, getResolutionWithResolvedFileName, reusedNames, logChanges) {
@@ -65810,8 +83847,10 @@ var ts;
             for (var _i = 0, names_2 = names; _i < names_2.length; _i++) {
                 var name = names_2[_i];
                 var resolution = resolutionsInFile.get(name);
+                // Resolution is valid if it is present and not invalidated
                 if (!seenNamesInFile.has(name) &&
                     allFilesHaveInvalidatedResolution || !resolution || resolution.isInvalidated ||
+                    // If the name is unresolved import that was invalidated, recalculate
                     (hasInvalidatedNonRelativeUnresolvedImport && !ts.isExternalModuleNameRelative(name) && !getResolutionWithResolvedFileName(resolution))) {
                     var existingResolution = resolution;
                     var resolutionInDirectory = perDirectoryResolution.get(name);
@@ -65829,13 +83868,15 @@ var ts;
                     }
                     if (logChanges && filesWithChangedSetOfUnresolvedImports && !resolutionIsEqualTo(existingResolution, resolution)) {
                         filesWithChangedSetOfUnresolvedImports.push(path);
+                        // reset log changes to avoid recording the same file multiple times
                         logChanges = false;
                     }
                 }
                 ts.Debug.assert(resolution !== undefined && !resolution.isInvalidated);
                 seenNamesInFile.set(name, true);
-                resolvedModules.push(getResolutionWithResolvedFileName(resolution));
+                resolvedModules.push(getResolutionWithResolvedFileName(resolution)); // TODO: GH#18217
             }
+            // Stop watching and remove the unused name
             resolutionsInFile.forEach(function (resolution, name) {
                 if (!seenNamesInFile.has(name) && !ts.contains(reusedNames, name)) {
                     stopWatchFailedLookupLocationOfResolution(resolution);
@@ -65862,7 +83903,8 @@ var ts;
             }
         }
         function resolveTypeReferenceDirectives(typeDirectiveNames, containingFile) {
-            return resolveNamesWithLocalCache(typeDirectiveNames, containingFile, resolvedTypeReferenceDirectives, perDirectoryResolvedTypeReferenceDirectives, ts.resolveTypeReferenceDirective, getResolvedTypeReferenceDirective, undefined, false);
+            return resolveNamesWithLocalCache(typeDirectiveNames, containingFile, resolvedTypeReferenceDirectives, perDirectoryResolvedTypeReferenceDirectives, ts.resolveTypeReferenceDirective, getResolvedTypeReferenceDirective, 
+            /*reusedNames*/ undefined, /*logChanges*/ false);
         }
         function resolveModuleNames(moduleNames, containingFile, reusedNames) {
             return resolveNamesWithLocalCache(moduleNames, containingFile, resolvedModuleNames, perDirectoryResolvedModuleNames, resolveModuleName, getResolvedModule, reusedNames, logChangesWhenResolvingModule);
@@ -65877,18 +83919,37 @@ var ts;
         function isNodeModulesAtTypesDirectory(dirPath) {
             return ts.endsWith(dirPath, "/node_modules/@types");
         }
-        function isDirectoryAtleastAtLevelFromFSRoot(dirPath, minLevels) {
-            for (var searchIndex = ts.getRootLength(dirPath); minLevels > 0; minLevels--) {
+        /**
+         * Filter out paths like
+         * "/", "/user", "/user/username", "/user/username/folderAtRoot",
+         * "c:/", "c:/users", "c:/users/username", "c:/users/username/folderAtRoot", "c:/folderAtRoot"
+         * @param dirPath
+         */
+        function canWatchDirectory(dirPath) {
+            var rootLength = ts.getRootLength(dirPath);
+            if (dirPath.length === rootLength) {
+                // Ignore "/", "c:/"
+                return false;
+            }
+            var nextDirectorySeparator = dirPath.indexOf(ts.directorySeparator, rootLength);
+            if (nextDirectorySeparator === -1) {
+                // ignore "/user", "c:/users" or "c:/folderAtRoot"
+                return false;
+            }
+            if (dirPath.charCodeAt(0) !== 47 /* slash */ &&
+                dirPath.substr(rootLength, nextDirectorySeparator).search(/users/i) === -1) {
+                // Paths like c:/folderAtRoot/subFolder are allowed
+                return true;
+            }
+            for (var searchIndex = nextDirectorySeparator + 1, searchLevels = 2; searchLevels > 0; searchLevels--) {
                 searchIndex = dirPath.indexOf(ts.directorySeparator, searchIndex) + 1;
                 if (searchIndex === 0) {
+                    // Folder isnt at expected minimun levels
                     return false;
                 }
             }
             return true;
         }
-        function canWatchDirectory(dirPath) {
-            return isDirectoryAtleastAtLevelFromFSRoot(dirPath, dirPath.charCodeAt(0) === 47 ? 3 : 1);
-        }
         function filterFSRootDirectoriesToWatch(watchPath, dirPath) {
             if (!canWatchDirectory(dirPath)) {
                 watchPath.ignore = true;
@@ -65897,18 +83958,21 @@ var ts;
         }
         function getDirectoryToWatchFailedLookupLocation(failedLookupLocation, failedLookupLocationPath) {
             if (isInDirectoryPath(rootPath, failedLookupLocationPath)) {
-                return { dir: rootDir, dirPath: rootPath };
+                return { dir: rootDir, dirPath: rootPath }; // TODO: GH#18217
             }
             return getDirectoryToWatchFromFailedLookupLocationDirectory(ts.getDirectoryPath(ts.getNormalizedAbsolutePath(failedLookupLocation, getCurrentDirectory())), ts.getDirectoryPath(failedLookupLocationPath));
         }
         function getDirectoryToWatchFromFailedLookupLocationDirectory(dir, dirPath) {
+            // If directory path contains node module, get the most parent node_modules directory for watching
             while (ts.stringContains(dirPath, "/node_modules/")) {
                 dir = ts.getDirectoryPath(dir);
                 dirPath = ts.getDirectoryPath(dirPath);
             }
+            // If the directory is node_modules use it to watch
             if (isNodeModulesDirectory(dirPath)) {
                 return filterFSRootDirectoriesToWatch({ dir: dir, dirPath: dirPath }, ts.getDirectoryPath(dirPath));
             }
+            // Use some ancestor of the root directory
             var subDirectoryPath, subDirectory;
             if (rootPath !== undefined) {
                 while (!isInDirectoryPath(dirPath, rootPath)) {
@@ -65928,6 +83992,7 @@ var ts;
             return ts.fileExtensionIsOneOf(path, failedLookupDefaultExtensions);
         }
         function watchFailedLookupLocationOfResolution(resolution) {
+            // No need to set the resolution refCount
             if (!resolution.failedLookupLocations || !resolution.failedLookupLocations.length) {
                 return;
             }
@@ -65943,6 +84008,8 @@ var ts;
                 var failedLookupLocationPath = resolutionHost.toPath(failedLookupLocation);
                 var _a = getDirectoryToWatchFailedLookupLocation(failedLookupLocation, failedLookupLocationPath), dir = _a.dir, dirPath = _a.dirPath, ignore = _a.ignore;
                 if (!ignore) {
+                    // If the failed lookup location path is not one of the supported extensions,
+                    // store it in the custom path
                     if (!isPathWithDefaultFailedLookupExtension(failedLookupLocationPath)) {
                         var refCount = customFailedLookupPaths.get(failedLookupLocationPath) || 0;
                         customFailedLookupPaths.set(failedLookupLocationPath, refCount + 1);
@@ -65956,7 +84023,7 @@ var ts;
                 }
             }
             if (setAtRoot) {
-                setDirectoryWatcher(rootDir, rootPath);
+                setDirectoryWatcher(rootDir, rootPath); // TODO: GH#18217
             }
         }
         function setDirectoryWatcher(dir, dirPath) {
@@ -66007,20 +84074,23 @@ var ts;
         }
         function removeDirectoryWatcher(dirPath) {
             var dirWatcher = directoryWatchesOfFailedLookups.get(dirPath);
+            // Do not close the watcher yet since it might be needed by other failed lookup locations.
             dirWatcher.refCount--;
         }
         function createDirectoryWatcher(directory, dirPath) {
             return resolutionHost.watchDirectoryOfFailedLookupLocation(directory, function (fileOrDirectory) {
                 var fileOrDirectoryPath = resolutionHost.toPath(fileOrDirectory);
                 if (cachedDirectoryStructureHost) {
+                    // Since the file existence changed, update the sourceFiles cache
                     cachedDirectoryStructureHost.addOrDeleteFileOrDirectory(fileOrDirectory, fileOrDirectoryPath);
                 }
                 if (!allFilesHaveInvalidatedResolution && invalidateResolutionOfFailedLookupLocation(fileOrDirectoryPath, dirPath === fileOrDirectoryPath)) {
                     resolutionHost.onInvalidatedResolution();
                 }
-            }, 1);
+            }, 1 /* Recursive */);
         }
         function removeResolutionsOfFileFromCache(cache, filePath) {
+            // Deleted file, stop watching failed lookups for all the resolutions in the file
             var resolutions = cache.get(filePath);
             if (resolutions) {
                 resolutions.forEach(stopWatchFailedLookupLocationOfResolution);
@@ -66046,6 +84116,7 @@ var ts;
                     }
                     seenInDir.set(name, true);
                     if (!resolution.isInvalidated && isInvalidatedResolution(resolution, getResolutionWithResolvedFileName)) {
+                        // Mark the file as needing re-evaluation of module resolution instead of using it blindly.
                         resolution.isInvalidated = true;
                         (filesWithInvalidatedResolutions || (filesWithInvalidatedResolutions = ts.createMap())).set(containingFilePath, true);
                     }
@@ -66057,6 +84128,8 @@ var ts;
             return resolvedModuleNames.size > maxSize || resolvedTypeReferenceDirectives.size > maxSize;
         }
         function invalidateResolutions(isInvalidatedResolution) {
+            // If more than maxNumberOfFilesToIterateForInvalidation present,
+            // just invalidated all files and recalculate the resolutions for files instead
             if (hasReachedResolutionIterationLimit()) {
                 allFilesHaveInvalidatedResolution = true;
                 return;
@@ -66066,9 +84139,11 @@ var ts;
         }
         function invalidateResolutionOfFile(filePath) {
             removeResolutionsOfFile(filePath);
-            invalidateResolutions(function (resolution, getResolutionWithResolvedFileName) {
+            invalidateResolutions(
+            // Resolution is invalidated if the resulting file name is same as the deleted file path
+            function (resolution, getResolutionWithResolvedFileName) {
                 var result = getResolutionWithResolvedFileName(resolution);
-                return !!result && resolutionHost.toPath(result.resolvedFileName) === filePath;
+                return !!result && resolutionHost.toPath(result.resolvedFileName) === filePath; // TODO: GH#18217
             });
         }
         function setFilesWithInvalidatedNonRelativeUnresolvedImports(filesMap) {
@@ -66078,12 +84153,17 @@ var ts;
         function invalidateResolutionOfFailedLookupLocation(fileOrDirectoryPath, isCreatingWatchedDirectory) {
             var isChangedFailedLookupLocation;
             if (isCreatingWatchedDirectory) {
+                // Watching directory is created
+                // Invalidate any resolution has failed lookup in this directory
                 isChangedFailedLookupLocation = function (location) { return isInDirectoryPath(fileOrDirectoryPath, resolutionHost.toPath(location)); };
             }
             else {
+                // Some file or directory in the watching directory is created
+                // Return early if it does not have any of the watching extension or not the custom failed lookup path
                 var dirOfFileOrDirectory = ts.getDirectoryPath(fileOrDirectoryPath);
                 if (isNodeModulesAtTypesDirectory(fileOrDirectoryPath) || isNodeModulesDirectory(fileOrDirectoryPath) ||
                     isNodeModulesAtTypesDirectory(dirOfFileOrDirectory) || isNodeModulesDirectory(dirOfFileOrDirectory)) {
+                    // Invalidate any resolution from this directory
                     isChangedFailedLookupLocation = function (location) {
                         var locationPath = resolutionHost.toPath(location);
                         return locationPath === fileOrDirectoryPath || ts.startsWith(resolutionHost.toPath(location), fileOrDirectoryPath);
@@ -66093,15 +84173,19 @@ var ts;
                     if (!isPathWithDefaultFailedLookupExtension(fileOrDirectoryPath) && !customFailedLookupPaths.has(fileOrDirectoryPath)) {
                         return false;
                     }
+                    // Ignore emits from the program
                     if (ts.isEmittedFileOfProgram(resolutionHost.getCurrentProgram(), fileOrDirectoryPath)) {
                         return false;
                     }
+                    // Resolution need to be invalidated if failed lookup location is same as the file or directory getting created
                     isChangedFailedLookupLocation = function (location) { return resolutionHost.toPath(location) === fileOrDirectoryPath; };
                 }
             }
             var hasChangedFailedLookupLocation = function (resolution) { return ts.some(resolution.failedLookupLocations, isChangedFailedLookupLocation); };
             var invalidatedFilesCount = filesWithInvalidatedResolutions && filesWithInvalidatedResolutions.size;
-            invalidateResolutions(hasChangedFailedLookupLocation);
+            invalidateResolutions(
+            // Resolution is invalidated if the resulting file name is same as the deleted file path
+            hasChangedFailedLookupLocation);
             return allFilesHaveInvalidatedResolution || filesWithInvalidatedResolutions && filesWithInvalidatedResolutions.size !== invalidatedFilesCount;
         }
         function closeTypeRootsWatch() {
@@ -66118,24 +84202,39 @@ var ts;
             return !ignore && directoryWatchesOfFailedLookups.has(dirPath) ? dirPath : undefined;
         }
         function createTypeRootsWatch(typeRootPath, typeRoot) {
+            // Create new watch and recursive info
             return resolutionHost.watchTypeRootsDirectory(typeRoot, function (fileOrDirectory) {
                 var fileOrDirectoryPath = resolutionHost.toPath(fileOrDirectory);
                 if (cachedDirectoryStructureHost) {
+                    // Since the file existence changed, update the sourceFiles cache
                     cachedDirectoryStructureHost.addOrDeleteFileOrDirectory(fileOrDirectory, fileOrDirectoryPath);
                 }
+                // For now just recompile
+                // We could potentially store more data here about whether it was/would be really be used or not
+                // and with that determine to trigger compilation but for now this is enough
                 resolutionHost.onChangedAutomaticTypeDirectiveNames();
+                // Since directory watchers invoked are flaky, the failed lookup location events might not be triggered
+                // So handle to failed lookup locations here as well to ensure we are invalidating resolutions
                 var dirPath = getDirectoryToWatchFailedLookupLocationFromTypeRoot(typeRoot, typeRootPath);
                 if (dirPath && invalidateResolutionOfFailedLookupLocation(fileOrDirectoryPath, dirPath === fileOrDirectoryPath)) {
                     resolutionHost.onInvalidatedResolution();
                 }
-            }, 1);
+            }, 1 /* Recursive */);
         }
+        /**
+         * Watches the types that would get added as part of getAutomaticTypeDirectiveNames
+         * To be called when compiler options change
+         */
         function updateTypeRootsWatch() {
             var options = resolutionHost.getCompilationSettings();
             if (options.types) {
+                // No need to do any watch since resolution cache is going to handle the failed lookups
+                // for the types added by this
                 closeTypeRootsWatch();
                 return;
             }
+            // we need to assume the directories exist to ensure that we can get all the type root directories that get included
+            // But filter directories that are at root level to say directory doesnt exist, so that we arent watching them
             var typeRoots = ts.getEffectiveTypeRoots(options, { directoryExists: directoryExistsForTypeRootWatch, getCurrentDirectory: getCurrentDirectory });
             if (typeRoots) {
                 ts.mutateMap(typeRootsWatches, ts.arrayToMap(typeRoots, function (tr) { return resolutionHost.toPath(tr); }), {
@@ -66147,6 +84246,11 @@ var ts;
                 closeTypeRootsWatch();
             }
         }
+        /**
+         * Use this function to return if directory exists to get type roots to watch
+         * If we return directory exists then only the paths will be added to type roots
+         * Hence return true for all directories except root directories which are filtered from watching
+         */
         function directoryExistsForTypeRootWatch(nodeTypesDirectory) {
             var dir = ts.getDirectoryPath(ts.getDirectoryPath(nodeTypesDirectory));
             var dirPath = resolutionHost.toPath(dir);
@@ -66155,13 +84259,326 @@ var ts;
     }
     ts.createResolutionCache = createResolutionCache;
 })(ts || (ts = {}));
+// Used by importFixes to synthesize import module specifiers.
+/* @internal */
+var ts;
+(function (ts) {
+    var moduleSpecifiers;
+    (function (moduleSpecifiers) {
+        // Note: fromSourceFile is just for usesJsExtensionOnImports
+        function getModuleSpecifier(compilerOptions, fromSourceFile, fromSourceFileName, toFileName, host, preferences) {
+            if (preferences === void 0) { preferences = {}; }
+            var info = getInfo(compilerOptions, fromSourceFile, fromSourceFileName, host);
+            return getGlobalModuleSpecifier(toFileName, info, host, compilerOptions) ||
+                ts.first(getLocalModuleSpecifiers(toFileName, info, compilerOptions, preferences));
+        }
+        moduleSpecifiers.getModuleSpecifier = getModuleSpecifier;
+        // For each symlink/original for a module, returns a list of ways to import that file.
+        function getModuleSpecifiers(moduleSymbol, program, importingSourceFile, host, preferences) {
+            var ambient = tryGetModuleNameFromAmbientModule(moduleSymbol);
+            if (ambient)
+                return [[ambient]];
+            var compilerOptions = program.getCompilerOptions();
+            var info = getInfo(compilerOptions, importingSourceFile, importingSourceFile.fileName, host);
+            var modulePaths = getAllModulePaths(program, ts.getSourceFileOfNode(moduleSymbol.valueDeclaration));
+            var global = ts.mapDefined(modulePaths, function (moduleFileName) { return getGlobalModuleSpecifier(moduleFileName, info, host, compilerOptions); });
+            return global.length ? global.map(function (g) { return [g]; }) : modulePaths.map(function (moduleFileName) {
+                return getLocalModuleSpecifiers(moduleFileName, info, compilerOptions, preferences);
+            });
+        }
+        moduleSpecifiers.getModuleSpecifiers = getModuleSpecifiers;
+        // importingSourceFileName is separate because getEditsForFileRename may need to specify an updated path
+        function getInfo(compilerOptions, importingSourceFile, importingSourceFileName, host) {
+            var moduleResolutionKind = ts.getEmitModuleResolutionKind(compilerOptions);
+            var addJsExtension = usesJsExtensionOnImports(importingSourceFile);
+            var getCanonicalFileName = ts.createGetCanonicalFileName(host.useCaseSensitiveFileNames ? host.useCaseSensitiveFileNames() : true);
+            var sourceDirectory = ts.getDirectoryPath(importingSourceFileName);
+            return { moduleResolutionKind: moduleResolutionKind, addJsExtension: addJsExtension, getCanonicalFileName: getCanonicalFileName, sourceDirectory: sourceDirectory };
+        }
+        function getGlobalModuleSpecifier(moduleFileName, _a, host, compilerOptions) {
+            var addJsExtension = _a.addJsExtension, getCanonicalFileName = _a.getCanonicalFileName, sourceDirectory = _a.sourceDirectory;
+            return tryGetModuleNameFromTypeRoots(compilerOptions, host, getCanonicalFileName, moduleFileName, addJsExtension)
+                || tryGetModuleNameAsNodeModule(compilerOptions, moduleFileName, host, getCanonicalFileName, sourceDirectory)
+                || compilerOptions.rootDirs && tryGetModuleNameFromRootDirs(compilerOptions.rootDirs, moduleFileName, sourceDirectory, getCanonicalFileName);
+        }
+        function getLocalModuleSpecifiers(moduleFileName, _a, compilerOptions, preferences) {
+            var moduleResolutionKind = _a.moduleResolutionKind, addJsExtension = _a.addJsExtension, getCanonicalFileName = _a.getCanonicalFileName, sourceDirectory = _a.sourceDirectory;
+            var baseUrl = compilerOptions.baseUrl, paths = compilerOptions.paths;
+            var relativePath = removeExtensionAndIndexPostFix(ts.ensurePathIsNonModuleName(ts.getRelativePathFromDirectory(sourceDirectory, moduleFileName, getCanonicalFileName)), moduleResolutionKind, addJsExtension);
+            if (!baseUrl || preferences.importModuleSpecifierPreference === "relative") {
+                return [relativePath];
+            }
+            var relativeToBaseUrl = getRelativePathIfInDirectory(moduleFileName, baseUrl, getCanonicalFileName);
+            if (!relativeToBaseUrl) {
+                return [relativePath];
+            }
+            var importRelativeToBaseUrl = removeExtensionAndIndexPostFix(relativeToBaseUrl, moduleResolutionKind, addJsExtension);
+            if (paths) {
+                var fromPaths = tryGetModuleNameFromPaths(ts.removeFileExtension(relativeToBaseUrl), importRelativeToBaseUrl, paths);
+                if (fromPaths) {
+                    return [fromPaths];
+                }
+            }
+            if (preferences.importModuleSpecifierPreference === "non-relative") {
+                return [importRelativeToBaseUrl];
+            }
+            if (preferences.importModuleSpecifierPreference !== undefined)
+                ts.Debug.assertNever(preferences.importModuleSpecifierPreference);
+            if (isPathRelativeToParent(relativeToBaseUrl)) {
+                return [relativePath];
+            }
+            /*
+            Prefer a relative import over a baseUrl import if it doesn't traverse up to baseUrl.
+    
+            Suppose we have:
+                baseUrl = /base
+                sourceDirectory = /base/a/b
+                moduleFileName = /base/foo/bar
+            Then:
+                relativePath = ../../foo/bar
+                getRelativePathNParents(relativePath) = 2
+                pathFromSourceToBaseUrl = ../../
+                getRelativePathNParents(pathFromSourceToBaseUrl) = 2
+                2 < 2 = false
+            In this case we should prefer using the baseUrl path "/a/b" instead of the relative path "../../foo/bar".
+    
+            Suppose we have:
+                baseUrl = /base
+                sourceDirectory = /base/foo/a
+                moduleFileName = /base/foo/bar
+            Then:
+                relativePath = ../a
+                getRelativePathNParents(relativePath) = 1
+                pathFromSourceToBaseUrl = ../../
+                getRelativePathNParents(pathFromSourceToBaseUrl) = 2
+                1 < 2 = true
+            In this case we should prefer using the relative path "../a" instead of the baseUrl path "foo/a".
+            */
+            var pathFromSourceToBaseUrl = ts.ensurePathIsNonModuleName(ts.getRelativePathFromDirectory(sourceDirectory, baseUrl, getCanonicalFileName));
+            var relativeFirst = getRelativePathNParents(relativePath) < getRelativePathNParents(pathFromSourceToBaseUrl);
+            return relativeFirst ? [relativePath, importRelativeToBaseUrl] : [importRelativeToBaseUrl, relativePath];
+        }
+        function usesJsExtensionOnImports(_a) {
+            var imports = _a.imports;
+            return ts.firstDefined(imports, function (_a) {
+                var text = _a.text;
+                return ts.pathIsRelative(text) ? ts.fileExtensionIs(text, ".js" /* Js */) : undefined;
+            }) || false;
+        }
+        /**
+         * Looks for a existing imports that use symlinks to this module.
+         * Only if no symlink is available, the real path will be used.
+         */
+        function getAllModulePaths(program, _a) {
+            var fileName = _a.fileName;
+            var symlinks = ts.mapDefined(program.getSourceFiles(), function (sf) {
+                return sf.resolvedModules && ts.firstDefinedIterator(sf.resolvedModules.values(), function (res) {
+                    return res && res.resolvedFileName === fileName ? res.originalPath : undefined;
+                });
+            });
+            return symlinks.length === 0 ? [fileName] : symlinks;
+        }
+        function getRelativePathNParents(relativePath) {
+            var components = ts.getPathComponents(relativePath);
+            if (components[0] || components.length === 1)
+                return 0;
+            for (var i = 1; i < components.length; i++) {
+                if (components[i] !== "..")
+                    return i - 1;
+            }
+            return components.length - 1;
+        }
+        function tryGetModuleNameFromAmbientModule(moduleSymbol) {
+            var decl = moduleSymbol.valueDeclaration;
+            if (ts.isModuleDeclaration(decl) && ts.isStringLiteral(decl.name)) {
+                return decl.name.text;
+            }
+        }
+        function tryGetModuleNameFromPaths(relativeToBaseUrlWithIndex, relativeToBaseUrl, paths) {
+            for (var key in paths) {
+                for (var _i = 0, _a = paths[key]; _i < _a.length; _i++) {
+                    var patternText_1 = _a[_i];
+                    var pattern = ts.removeFileExtension(ts.normalizePath(patternText_1));
+                    var indexOfStar = pattern.indexOf("*");
+                    if (indexOfStar === 0 && pattern.length === 1) {
+                        continue;
+                    }
+                    else if (indexOfStar !== -1) {
+                        var prefix = pattern.substr(0, indexOfStar);
+                        var suffix = pattern.substr(indexOfStar + 1);
+                        if (relativeToBaseUrl.length >= prefix.length + suffix.length &&
+                            ts.startsWith(relativeToBaseUrl, prefix) &&
+                            ts.endsWith(relativeToBaseUrl, suffix)) {
+                            var matchedStar = relativeToBaseUrl.substr(prefix.length, relativeToBaseUrl.length - suffix.length);
+                            return key.replace("*", matchedStar);
+                        }
+                    }
+                    else if (pattern === relativeToBaseUrl || pattern === relativeToBaseUrlWithIndex) {
+                        return key;
+                    }
+                }
+            }
+        }
+        function tryGetModuleNameFromRootDirs(rootDirs, moduleFileName, sourceDirectory, getCanonicalFileName) {
+            var normalizedTargetPath = getPathRelativeToRootDirs(moduleFileName, rootDirs, getCanonicalFileName);
+            if (normalizedTargetPath === undefined) {
+                return undefined;
+            }
+            var normalizedSourcePath = getPathRelativeToRootDirs(sourceDirectory, rootDirs, getCanonicalFileName);
+            var relativePath = normalizedSourcePath !== undefined ? ts.ensurePathIsNonModuleName(ts.getRelativePathFromDirectory(normalizedSourcePath, normalizedTargetPath, getCanonicalFileName)) : normalizedTargetPath;
+            return ts.removeFileExtension(relativePath);
+        }
+        function tryGetModuleNameFromTypeRoots(options, host, getCanonicalFileName, moduleFileName, addJsExtension) {
+            var roots = ts.getEffectiveTypeRoots(options, host);
+            return ts.firstDefined(roots, function (unNormalizedTypeRoot) {
+                var typeRoot = ts.toPath(unNormalizedTypeRoot, /*basePath*/ undefined, getCanonicalFileName);
+                if (ts.startsWith(moduleFileName, typeRoot)) {
+                    // For a type definition, we can strip `/index` even with classic resolution.
+                    return removeExtensionAndIndexPostFix(moduleFileName.substring(typeRoot.length + 1), ts.ModuleResolutionKind.NodeJs, addJsExtension);
+                }
+            });
+        }
+        function tryGetModuleNameAsNodeModule(options, moduleFileName, host, getCanonicalFileName, sourceDirectory) {
+            if (ts.getEmitModuleResolutionKind(options) !== ts.ModuleResolutionKind.NodeJs) {
+                // nothing to do here
+                return undefined;
+            }
+            var parts = getNodeModulePathParts(moduleFileName);
+            if (!parts) {
+                return undefined;
+            }
+            // Simplify the full file path to something that can be resolved by Node.
+            // If the module could be imported by a directory name, use that directory's name
+            var moduleSpecifier = getDirectoryOrExtensionlessFileName(moduleFileName);
+            // Get a path that's relative to node_modules or the importing file's path
+            // if node_modules folder is in this folder or any of its parent folders, no need to keep it.
+            if (!ts.startsWith(sourceDirectory, moduleSpecifier.substring(0, parts.topLevelNodeModulesIndex)))
+                return undefined;
+            // If the module was found in @types, get the actual Node package name
+            return ts.getPackageNameFromAtTypesDirectory(moduleSpecifier.substring(parts.topLevelPackageNameIndex + 1));
+            function getDirectoryOrExtensionlessFileName(path) {
+                // If the file is the main module, it can be imported by the package name
+                var packageRootPath = path.substring(0, parts.packageRootIndex);
+                var packageJsonPath = ts.combinePaths(packageRootPath, "package.json");
+                if (host.fileExists(packageJsonPath)) { // TODO: GH#18217
+                    var packageJsonContent = JSON.parse(host.readFile(packageJsonPath));
+                    if (packageJsonContent) {
+                        var mainFileRelative = packageJsonContent.typings || packageJsonContent.types || packageJsonContent.main;
+                        if (mainFileRelative) {
+                            var mainExportFile = ts.toPath(mainFileRelative, packageRootPath, getCanonicalFileName);
+                            if (ts.removeFileExtension(mainExportFile) === ts.removeFileExtension(getCanonicalFileName(path))) {
+                                return packageRootPath;
+                            }
+                        }
+                    }
+                }
+                // We still have a file name - remove the extension
+                var fullModulePathWithoutExtension = ts.removeFileExtension(path);
+                // If the file is /index, it can be imported by its directory name
+                // IFF there is not _also_ a file by the same name
+                if (getCanonicalFileName(fullModulePathWithoutExtension.substring(parts.fileNameIndex)) === "/index" && !tryGetAnyFileFromPath(host, fullModulePathWithoutExtension.substring(0, parts.fileNameIndex))) {
+                    return fullModulePathWithoutExtension.substring(0, parts.fileNameIndex);
+                }
+                return fullModulePathWithoutExtension;
+            }
+        }
+        function tryGetAnyFileFromPath(host, path) {
+            // We check all js, `node` and `json` extensions in addition to TS, since node module resolution would also choose those over the directory
+            var extensions = ts.getSupportedExtensions({ allowJs: true }, [{ extension: "node", isMixedContent: false }, { extension: "json", isMixedContent: false, scriptKind: 6 /* JSON */ }]);
+            for (var _i = 0, extensions_1 = extensions; _i < extensions_1.length; _i++) {
+                var e = extensions_1[_i];
+                var fullPath = path + e;
+                if (host.fileExists(fullPath)) { // TODO: GH#18217
+                    return fullPath;
+                }
+            }
+        }
+        function getNodeModulePathParts(fullPath) {
+            // If fullPath can't be valid module file within node_modules, returns undefined.
+            // Example of expected pattern: /base/path/node_modules/[@scope/otherpackage/@otherscope/node_modules/]package/[subdirectory/]file.js
+            // Returns indices:                       ^            ^                                                      ^             ^
+            var topLevelNodeModulesIndex = 0;
+            var topLevelPackageNameIndex = 0;
+            var packageRootIndex = 0;
+            var fileNameIndex = 0;
+            var States;
+            (function (States) {
+                States[States["BeforeNodeModules"] = 0] = "BeforeNodeModules";
+                States[States["NodeModules"] = 1] = "NodeModules";
+                States[States["Scope"] = 2] = "Scope";
+                States[States["PackageContent"] = 3] = "PackageContent";
+            })(States || (States = {}));
+            var partStart = 0;
+            var partEnd = 0;
+            var state = 0 /* BeforeNodeModules */;
+            while (partEnd >= 0) {
+                partStart = partEnd;
+                partEnd = fullPath.indexOf("/", partStart + 1);
+                switch (state) {
+                    case 0 /* BeforeNodeModules */:
+                        if (fullPath.indexOf("/node_modules/", partStart) === partStart) {
+                            topLevelNodeModulesIndex = partStart;
+                            topLevelPackageNameIndex = partEnd;
+                            state = 1 /* NodeModules */;
+                        }
+                        break;
+                    case 1 /* NodeModules */:
+                    case 2 /* Scope */:
+                        if (state === 1 /* NodeModules */ && fullPath.charAt(partStart + 1) === "@") {
+                            state = 2 /* Scope */;
+                        }
+                        else {
+                            packageRootIndex = partEnd;
+                            state = 3 /* PackageContent */;
+                        }
+                        break;
+                    case 3 /* PackageContent */:
+                        if (fullPath.indexOf("/node_modules/", partStart) === partStart) {
+                            state = 1 /* NodeModules */;
+                        }
+                        else {
+                            state = 3 /* PackageContent */;
+                        }
+                        break;
+                }
+            }
+            fileNameIndex = partStart;
+            return state > 1 /* NodeModules */ ? { topLevelNodeModulesIndex: topLevelNodeModulesIndex, topLevelPackageNameIndex: topLevelPackageNameIndex, packageRootIndex: packageRootIndex, fileNameIndex: fileNameIndex } : undefined;
+        }
+        function getPathRelativeToRootDirs(path, rootDirs, getCanonicalFileName) {
+            return ts.firstDefined(rootDirs, function (rootDir) {
+                var relativePath = getRelativePathIfInDirectory(path, rootDir, getCanonicalFileName); // TODO: GH#18217
+                return isPathRelativeToParent(relativePath) ? undefined : relativePath;
+            });
+        }
+        function removeExtensionAndIndexPostFix(fileName, moduleResolutionKind, addJsExtension) {
+            var noExtension = ts.removeFileExtension(fileName);
+            return addJsExtension
+                ? noExtension + ".js"
+                : moduleResolutionKind === ts.ModuleResolutionKind.NodeJs
+                    ? ts.removeSuffix(noExtension, "/index")
+                    : noExtension;
+        }
+        function getRelativePathIfInDirectory(path, directoryPath, getCanonicalFileName) {
+            var relativePath = ts.getRelativePathToDirectoryOrUrl(directoryPath, path, directoryPath, getCanonicalFileName, /*isAbsolutePathAnUrl*/ false);
+            return ts.isRootedDiskPath(relativePath) ? undefined : relativePath;
+        }
+        function isPathRelativeToParent(path) {
+            return ts.startsWith(path, "..");
+        }
+    })(moduleSpecifiers = ts.moduleSpecifiers || (ts.moduleSpecifiers = {}));
+})(ts || (ts = {}));
+/*@internal*/
 var ts;
 (function (ts) {
     var sysFormatDiagnosticsHost = ts.sys ? {
         getCurrentDirectory: function () { return ts.sys.getCurrentDirectory(); },
         getNewLine: function () { return ts.sys.newLine; },
         getCanonicalFileName: ts.createGetCanonicalFileName(ts.sys.useCaseSensitiveFileNames)
-    } : undefined;
+    } : undefined; // TODO: GH#18217
+    /**
+     * Create a function that reports error by writing to the system and handles the formating of the diagnostic
+     */
     function createDiagnosticReporter(system, pretty) {
         var host = system === ts.sys ? sysFormatDiagnosticsHost : {
             getCurrentDirectory: function () { return system.getCurrentDirectory(); },
@@ -66175,14 +84592,18 @@ var ts;
         return function (diagnostic) {
             diagnostics[0] = diagnostic;
             system.write(ts.formatDiagnosticsWithColorAndContext(diagnostics, host) + host.getNewLine());
-            diagnostics[0] = undefined;
+            diagnostics[0] = undefined; // TODO: GH#18217
         };
     }
     ts.createDiagnosticReporter = createDiagnosticReporter;
+    /** @internal */
     ts.nonClearingMessageCodes = [
         ts.Diagnostics.Found_1_error_Watching_for_file_changes.code,
         ts.Diagnostics.Found_0_errors_Watching_for_file_changes.code
     ];
+    /**
+     * @returns Whether the screen was cleared.
+     */
     function clearScreenIfNotWatchingForFileChanges(system, diagnostic, options) {
         if (system.clearScreen &&
             !options.preserveWatchOutput &&
@@ -66194,6 +84615,7 @@ var ts;
         }
         return false;
     }
+    /** @internal */
     ts.screenStartingMessageCodes = [
         ts.Diagnostics.Starting_compilation_in_watch_mode.code,
         ts.Diagnostics.File_change_detected_Starting_incremental_compilation.code,
@@ -66203,6 +84625,9 @@ var ts;
             ? newLine + newLine
             : newLine;
     }
+    /**
+     * Create a function that reports watch status by writing to the system and handles the formating of the diagnostic
+     */
     function createWatchStatusReporter(system, pretty) {
         return pretty ?
             function (diagnostic, newLine, options) {
@@ -66222,19 +84647,26 @@ var ts;
             };
     }
     ts.createWatchStatusReporter = createWatchStatusReporter;
+    /** Parses config file using System interface */
     function parseConfigFileWithSystem(configFileName, optionsToExtend, system, reportDiagnostic) {
         var host = system;
         host.onUnRecoverableConfigFileDiagnostic = function (diagnostic) { return reportUnrecoverableDiagnostic(ts.sys, reportDiagnostic, diagnostic); };
         var result = ts.getParsedCommandLineOfConfigFile(configFileName, optionsToExtend, host);
-        host.onUnRecoverableConfigFileDiagnostic = undefined;
+        host.onUnRecoverableConfigFileDiagnostic = undefined; // TODO: GH#18217
         return result;
     }
     ts.parseConfigFileWithSystem = parseConfigFileWithSystem;
+    /**
+     * Helper that emit files, report diagnostics and lists emitted and/or source files depending on compiler options
+     */
     function emitFilesAndReportErrors(program, reportDiagnostic, writeFileName, reportSummary) {
+        // First get and report any syntactic errors.
         var diagnostics = program.getConfigFileParsingDiagnostics().slice();
         var configFileParsingDiagnosticsLength = diagnostics.length;
         ts.addRange(diagnostics, program.getSyntacticDiagnostics());
         var reportSemanticDiagnostics = false;
+        // If we didn't have any syntactic errors, then also try getting the global and
+        // semantic errors.
         if (diagnostics.length === configFileParsingDiagnosticsLength) {
             ts.addRange(diagnostics, program.getOptionsDiagnostics());
             ts.addRange(diagnostics, program.getGlobalDiagnostics());
@@ -66242,6 +84674,7 @@ var ts;
                 reportSemanticDiagnostics = true;
             }
         }
+        // Emit and report any errors we ran into.
         var _a = program.emit(), emittedFiles = _a.emittedFiles, emitSkipped = _a.emitSkipped, emitDiagnostics = _a.diagnostics;
         ts.addRange(diagnostics, emitDiagnostics);
         if (reportSemanticDiagnostics) {
@@ -66264,15 +84697,21 @@ var ts;
             reportSummary(diagnostics.filter(function (diagnostic) { return diagnostic.category === ts.DiagnosticCategory.Error; }).length);
         }
         if (emitSkipped && diagnostics.length > 0) {
+            // If the emitter didn't emit anything, then pass that value along.
             return ts.ExitStatus.DiagnosticsPresent_OutputsSkipped;
         }
         else if (diagnostics.length > 0) {
+            // The emitter emitted something, inform the caller if that happened in the presence
+            // of diagnostics or not.
             return ts.ExitStatus.DiagnosticsPresent_OutputsGenerated;
         }
         return ts.ExitStatus.Success;
     }
     ts.emitFilesAndReportErrors = emitFilesAndReportErrors;
     var noopFileWatcher = { close: ts.noop };
+    /**
+     * Creates the watch compiler host that can be extended with config file or root file names and options host
+     */
     function createWatchCompilerHost(system, createProgram, reportDiagnostic, reportWatchStatus) {
         if (system === void 0) { system = ts.sys; }
         if (!createProgram) {
@@ -66298,11 +84737,11 @@ var ts;
             watchFile: system.watchFile ? (function (path, callback, pollingInterval) { return system.watchFile(path, callback, pollingInterval); }) : function () { return noopFileWatcher; },
             watchDirectory: system.watchDirectory ? (function (path, callback, recursive) { return system.watchDirectory(path, callback, recursive); }) : function () { return noopFileWatcher; },
             setTimeout: system.setTimeout ? (function (callback, ms) {
-                var _a;
                 var args = [];
                 for (var _i = 2; _i < arguments.length; _i++) {
                     args[_i - 2] = arguments[_i];
                 }
+                var _a;
                 return (_a = system.setTimeout).call.apply(_a, [system, callback, ms].concat(args));
             }) : ts.noop,
             clearTimeout: system.clearTimeout ? (function (timeoutId) { return system.clearTimeout(timeoutId); }) : ts.noop,
@@ -66332,10 +84771,16 @@ var ts;
             emitFilesAndReportErrors(builderProgram, reportDiagnostic, writeFileName, reportSummary);
         }
     }
+    /**
+     * Report error and exit
+     */
     function reportUnrecoverableDiagnostic(system, reportDiagnostic, diagnostic) {
         reportDiagnostic(diagnostic);
         system.exit(ts.ExitStatus.DiagnosticsPresent_OutputsSkipped);
     }
+    /**
+     * Creates the watch compiler host from system for config file in watch mode
+     */
     function createWatchCompilerHostOfConfigFile(configFileName, optionsToExtend, system, createProgram, reportDiagnostic, reportWatchStatus) {
         var diagnosticReporter = reportDiagnostic || createDiagnosticReporter(system);
         var host = createWatchCompilerHost(system, createProgram, diagnosticReporter, reportWatchStatus);
@@ -66345,6 +84790,9 @@ var ts;
         return host;
     }
     ts.createWatchCompilerHostOfConfigFile = createWatchCompilerHostOfConfigFile;
+    /**
+     * Creates the watch compiler host from system for compiling root files and options in watch mode
+     */
     function createWatchCompilerHostOfFilesAndCompilerOptions(rootFiles, options, system, createProgram, reportDiagnostic, reportWatchStatus) {
         var host = createWatchCompilerHost(system, createProgram, reportDiagnostic || createDiagnosticReporter(system), reportWatchStatus);
         host.rootFiles = rootFiles;
@@ -66356,7 +84804,7 @@ var ts;
 (function (ts) {
     function createWatchCompilerHost(rootFilesOrConfigFileName, options, system, createProgram, reportDiagnostic, reportWatchStatus) {
         if (ts.isArray(rootFilesOrConfigFileName)) {
-            return ts.createWatchCompilerHostOfFilesAndCompilerOptions(rootFilesOrConfigFileName, options, system, createProgram, reportDiagnostic, reportWatchStatus);
+            return ts.createWatchCompilerHostOfFilesAndCompilerOptions(rootFilesOrConfigFileName, options, system, createProgram, reportDiagnostic, reportWatchStatus); // TODO: GH#18217
         }
         else {
             return ts.createWatchCompilerHostOfConfigFile(rootFilesOrConfigFileName, options, system, createProgram, reportDiagnostic, reportWatchStatus);
@@ -66366,14 +84814,14 @@ var ts;
     var initialVersion = 1;
     function createWatchProgram(host) {
         var builderProgram;
-        var reloadLevel;
-        var missingFilesMap;
-        var watchedWildcardDirectories;
-        var timerToUpdateProgram;
-        var sourceFilesCache = ts.createMap();
-        var missingFilePathsRequestedForRelease;
-        var hasChangedCompilerOptions = false;
-        var hasChangedAutomaticTypeDirectiveNames = false;
+        var reloadLevel; // level to indicate if the program needs to be reloaded from config file/just filenames etc
+        var missingFilesMap; // Map of file watchers for the missing files
+        var watchedWildcardDirectories; // map of watchers for the wild card directories in the config file
+        var timerToUpdateProgram; // timer callback to recompile the program
+        var sourceFilesCache = ts.createMap(); // Cache that stores the source file and version info
+        var missingFilePathsRequestedForRelease; // These paths are held temparirly so that we can remove the entry from source file cache if the file is not tracked by missing files
+        var hasChangedCompilerOptions = false; // True if the compiler options have changed between compilations
+        var hasChangedAutomaticTypeDirectiveNames = false; // True if the automatic type directives have changed
         var useCaseSensitiveFileNames = host.useCaseSensitiveFileNames();
         var currentDirectory = host.getCurrentDirectory();
         var getCurrentDirectory = function () { return currentDirectory; };
@@ -66396,6 +84844,7 @@ var ts;
             getCurrentDirectory: getCurrentDirectory,
             onUnRecoverableConfigFileDiagnostic: host.onUnRecoverableConfigFileDiagnostic
         };
+        // From tsc we want to get already parsed result and hence check for rootFileNames
         var newLine = updateNewLine();
         reportWatchDiagnostic(ts.Diagnostics.Starting_compilation_in_watch_mode);
         if (configFileName) {
@@ -66412,7 +84861,7 @@ var ts;
         var trace = host.trace && (function (s) { host.trace(s + newLine); });
         var watchLogLevel = trace ? compilerOptions.extendedDiagnostics ? ts.WatchLogLevel.Verbose :
             compilerOptions.diagnostis ? ts.WatchLogLevel.TriggerOnly : ts.WatchLogLevel.None : ts.WatchLogLevel.None;
-        var writeLog = watchLogLevel !== ts.WatchLogLevel.None ? trace : ts.noop;
+        var writeLog = watchLogLevel !== ts.WatchLogLevel.None ? trace : ts.noop; // TODO: GH#18217
         var _b = ts.getWatchFactory(watchLogLevel, writeLog), watchFile = _b.watchFile, watchFilePath = _b.watchFilePath, watchDirectory = _b.watchDirectory;
         var getCanonicalFileName = ts.createGetCanonicalFileName(useCaseSensitiveFileNames);
         writeLog("Current directory: " + currentDirectory + " CaseSensitiveFileNames: " + useCaseSensitiveFileNames);
@@ -66420,6 +84869,7 @@ var ts;
             watchFile(host, configFileName, scheduleProgramReload, ts.PollingInterval.High, "Config file");
         }
         var compilerHost = {
+            // Members for CompilerHost
             getSourceFile: function (fileName, languageVersion, onError, shouldCreateNewSourceFile) { return getVersionedSourceFileByPath(fileName, toPath(fileName), languageVersion, onError, shouldCreateNewSourceFile); },
             getSourceFileByPath: getVersionedSourceFileByPath,
             getDefaultLibLocation: host.getDefaultLibLocation && (function () { return host.getDefaultLibLocation(); }),
@@ -66438,6 +84888,7 @@ var ts;
             getEnvironmentVariable: host.getEnvironmentVariable ? (function (name) { return host.getEnvironmentVariable(name); }) : (function () { return ""; }),
             onReleaseOldSourceFile: onReleaseOldSourceFile,
             createHash: host.createHash && (function (data) { return host.createHash(data); }),
+            // Members for ResolutionCacheHost
             toPath: toPath,
             getCompilationSettings: function () { return compilerOptions; },
             watchDirectoryOfFailedLookupLocation: function (dir, cb, flags) { return watchDirectory(host, dir, cb, flags, "Failed Lookup Locations"); },
@@ -66452,9 +84903,12 @@ var ts;
             getCurrentProgram: getCurrentProgram,
             writeLog: writeLog
         };
+        // Cache for the module resolution
         var resolutionCache = ts.createResolutionCache(compilerHost, configFileName ?
             ts.getDirectoryPath(ts.getNormalizedAbsolutePath(configFileName, currentDirectory)) :
-            currentDirectory, false);
+            currentDirectory, 
+        /*logChangesWhenResolvingModule*/ false);
+        // Resolve module using host module resolution strategy if provided otherwise use resolution cache to resolve module names
         compilerHost.resolveModuleNames = host.resolveModuleNames ?
             (function (moduleNames, containingFile, reusedNames) { return host.resolveModuleNames(moduleNames, containingFile, reusedNames); }) :
             (function (moduleNames, containingFile, reusedNames) { return resolutionCache.resolveModuleNames(moduleNames, containingFile, reusedNames); });
@@ -66463,6 +84917,7 @@ var ts;
             (function (typeDirectiveNames, containingFile) { return resolutionCache.resolveTypeReferenceDirectives(typeDirectiveNames, containingFile); });
         var userProvidedResolution = !!host.resolveModuleNames || !!host.resolveTypeReferenceDirectives;
         synchronizeProgram();
+        // Update the wild card directory watch
         watchConfigFileWildCardDirectories();
         return configFileName ?
             { getCurrentProgram: getCurrentBuilderProgram, getProgram: synchronizeProgram } :
@@ -66482,10 +84937,11 @@ var ts;
                     resolutionCache.clear();
                 }
             }
+            // All resolutions are invalid if user provided resolutions
             var hasInvalidatedResolution = resolutionCache.createHasInvalidatedResolution(userProvidedResolution);
             if (ts.isProgramUptoDate(getCurrentProgram(), rootFileNames, compilerOptions, getSourceVersion, fileExists, hasInvalidatedResolution, hasChangedAutomaticTypeDirectiveNames)) {
                 if (hasChangedConfigFileParsingErrors) {
-                    builderProgram = createProgram(undefined, undefined, compilerHost, builderProgram, configFileParsingDiagnostics);
+                    builderProgram = createProgram(/*rootNames*/ undefined, /*options*/ undefined, compilerHost, builderProgram, configFileParsingDiagnostics);
                     hasChangedConfigFileParsingErrors = false;
                 }
             }
@@ -66498,6 +84954,7 @@ var ts;
             return builderProgram;
         }
         function createNewProgram(program, hasInvalidatedResolution) {
+            // Compile the program
             if (watchLogLevel !== ts.WatchLogLevel.None) {
                 writeLog("CreatingProgramWith::");
                 writeLog("  roots: " + JSON.stringify(rootFileNames));
@@ -66511,11 +84968,17 @@ var ts;
             compilerHost.hasChangedAutomaticTypeDirectiveNames = hasChangedAutomaticTypeDirectiveNames;
             builderProgram = createProgram(rootFileNames, compilerOptions, compilerHost, builderProgram, configFileParsingDiagnostics);
             resolutionCache.finishCachingPerDirectoryResolution();
+            // Update watches
             ts.updateMissingFilePathsWatch(builderProgram.getProgram(), missingFilesMap || (missingFilesMap = ts.createMap()), watchMissingFilePath);
             if (needsUpdateInTypeRootWatch) {
                 resolutionCache.updateTypeRootsWatch();
             }
             if (missingFilePathsRequestedForRelease) {
+                // These are the paths that program creater told us as not in use any more but were missing on the disk.
+                // We didnt remove the entry for them from sourceFiles cache so that we dont have to do File IO,
+                // if there is already watcher for it (for missing files)
+                // At this point our watches were updated, hence now we know that these paths are not tracked and need to be removed
+                // so that at later time we have correct result of their presence
                 for (var _i = 0, missingFilePathsRequestedForRelease_1 = missingFilePathsRequestedForRelease; _i < missingFilePathsRequestedForRelease_1.length; _i++) {
                     var missingFilePath = missingFilePathsRequestedForRelease_1[_i];
                     if (!missingFilesMap.has(missingFilePath)) {
@@ -66544,6 +85007,8 @@ var ts;
         }
         function fileExists(fileName) {
             var path = toPath(fileName);
+            // If file is missing on host from cache, we can definitely say file doesnt exist
+            // otherwise we need to ensure from the disk
             if (isFileMissingOnHost(sourceFilesCache.get(path))) {
                 return true;
             }
@@ -66551,9 +85016,11 @@ var ts;
         }
         function getVersionedSourceFileByPath(fileName, path, languageVersion, onError, shouldCreateNewSourceFile) {
             var hostSourceFile = sourceFilesCache.get(path);
+            // No source file on the host
             if (isFileMissingOnHost(hostSourceFile)) {
                 return undefined;
             }
+            // Create new source file if requested or the versions dont match
             if (!hostSourceFile || shouldCreateNewSourceFile || !isFilePresentOnHost(hostSourceFile) || hostSourceFile.version.toString() !== hostSourceFile.sourceFile.version) {
                 var sourceFile = getNewSourceFile();
                 if (hostSourceFile) {
@@ -66561,6 +85028,7 @@ var ts;
                         hostSourceFile.version++;
                     }
                     if (sourceFile) {
+                        // Set the source file and create file watcher now that file was present on the disk
                         hostSourceFile.sourceFile = sourceFile;
                         sourceFile.version = hostSourceFile.version.toString();
                         if (!hostSourceFile.fileWatcher) {
@@ -66568,6 +85036,7 @@ var ts;
                         }
                     }
                     else {
+                        // There is no source file on host any more, close the watch, missing file paths will track it
                         if (isFilePresentOnHost(hostSourceFile)) {
                             hostSourceFile.fileWatcher.close();
                         }
@@ -66607,6 +85076,7 @@ var ts;
             var hostSourceFile = sourceFilesCache.get(path);
             if (hostSourceFile !== undefined) {
                 if (isFileMissingOnHost(hostSourceFile)) {
+                    // The next version, lets set it as presence unknown file
                     sourceFilesCache.set(path, { version: Number(hostSourceFile) + 1 });
                 }
                 else {
@@ -66620,7 +85090,12 @@ var ts;
         }
         function onReleaseOldSourceFile(oldSourceFile, _oldOptions) {
             var hostSourceFileInfo = sourceFilesCache.get(oldSourceFile.path);
+            // If this is the source file thats in the cache and new program doesnt need it,
+            // remove the cached entry.
+            // Note we arent deleting entry if file became missing in new program or
+            // there was version update and new source file was created.
             if (hostSourceFileInfo) {
+                // record the missing file paths so they can be removed later if watchers arent tracking them
                 if (isFileMissingOnHost(hostSourceFileInfo)) {
                     (missingFilePathsRequestedForRelease || (missingFilePathsRequestedForRelease = [])).push(oldSourceFile.path);
                 }
@@ -66638,6 +85113,9 @@ var ts;
                 host.onWatchStatusChange(ts.createCompilerDiagnostic(message), newLine, compilerOptions || optionsToExtendForConfigFile);
             }
         }
+        // Upon detecting a file change, wait for 250ms and then perform a recompilation. This gives batch
+        // operations (such as saving all modified files in an editor) a chance to complete before we kick
+        // off a new compilation.
         function scheduleProgramUpdate() {
             if (!host.setTimeout || !host.clearTimeout) {
                 return;
@@ -66678,6 +85156,7 @@ var ts;
                 hasChangedConfigFileParsingErrors = true;
             }
             rootFileNames = result.fileNames;
+            // Update the program
             synchronizeProgram();
         }
         function reloadConfigFile() {
@@ -66689,24 +85168,27 @@ var ts;
             parseConfigFile();
             hasChangedCompilerOptions = true;
             synchronizeProgram();
+            // Update the wild card directory watch
             watchConfigFileWildCardDirectories();
         }
         function parseConfigFile() {
-            setConfigFileParsingResult(ts.getParsedCommandLineOfConfigFile(configFileName, optionsToExtendForConfigFile, parseConfigFileHost));
+            setConfigFileParsingResult(ts.getParsedCommandLineOfConfigFile(configFileName, optionsToExtendForConfigFile, parseConfigFileHost)); // TODO: GH#18217
         }
         function setConfigFileParsingResult(configFileParseResult) {
             rootFileNames = configFileParseResult.fileNames;
             compilerOptions = configFileParseResult.options;
-            configFileSpecs = configFileParseResult.configFileSpecs;
+            configFileSpecs = configFileParseResult.configFileSpecs; // TODO: GH#18217
             configFileParsingDiagnostics = ts.getConfigFileParsingDiagnostics(configFileParseResult);
             hasChangedConfigFileParsingErrors = true;
         }
         function onSourceFileChange(fileName, eventKind, path) {
             updateCachedSystemWithFile(fileName, path, eventKind);
+            // Update the source file cache
             if (eventKind === ts.FileWatcherEventKind.Deleted && sourceFilesCache.get(path)) {
                 resolutionCache.invalidateResolutionOfFile(path);
             }
             nextSourceFileVersion(path);
+            // Update the program
             scheduleProgramUpdate();
         }
         function updateCachedSystemWithFile(fileName, path, eventKind) {
@@ -66722,7 +85204,9 @@ var ts;
             if (eventKind === ts.FileWatcherEventKind.Created && missingFilesMap.has(missingFilePath)) {
                 missingFilesMap.get(missingFilePath).close();
                 missingFilesMap.delete(missingFilePath);
+                // Delete the entry in the source files cache so that new source file is created
                 nextSourceFileVersion(missingFilePath);
+                // When a missing file is created, we should update the graph.
                 scheduleProgramUpdate();
             }
         }
@@ -66738,16 +85222,21 @@ var ts;
             return watchDirectory(host, directory, function (fileOrDirectory) {
                 ts.Debug.assert(!!configFileName);
                 var fileOrDirectoryPath = toPath(fileOrDirectory);
+                // Since the file existance changed, update the sourceFiles cache
                 if (cachedDirectoryStructureHost) {
                     cachedDirectoryStructureHost.addOrDeleteFileOrDirectory(fileOrDirectory, fileOrDirectoryPath);
                 }
                 nextSourceFileVersion(fileOrDirectoryPath);
+                // If the the added or created file or directory is not supported file name, ignore the file
+                // But when watched directory is added/removed, we need to reload the file list
                 if (fileOrDirectoryPath !== directory && ts.hasExtension(fileOrDirectoryPath) && !ts.isSupportedSourceFileName(fileOrDirectory, compilerOptions)) {
                     writeLog("Project: " + configFileName + " Detected file add/remove of non supported extension: " + fileOrDirectory);
                     return;
                 }
+                // Reload is pending, do the reload
                 if (reloadLevel !== ts.ConfigFileProgramReloadLevel.Full) {
                     reloadLevel = ts.ConfigFileProgramReloadLevel.Partial;
+                    // Schedule Update the program
                     scheduleProgramUpdate();
                 }
             }, flags, "Wild card directories");
@@ -66778,1873 +85267,953 @@ var ts;
 })(ts || (ts = {}));
 var ts;
 (function (ts) {
-    ts.compileOnSaveCommandLineOption = { name: "compileOnSave", type: "boolean" };
-    ts.optionDeclarations = [
+    var minimumDate = new Date(-8640000000000000);
+    var maximumDate = new Date(8640000000000000);
+    var BuildResultFlags;
+    (function (BuildResultFlags) {
+        BuildResultFlags[BuildResultFlags["None"] = 0] = "None";
+        /**
+         * No errors of any kind occurred during build
+         */
+        BuildResultFlags[BuildResultFlags["Success"] = 1] = "Success";
+        /**
+         * None of the .d.ts files emitted by this build were
+         * different from the existing files on disk
+         */
+        BuildResultFlags[BuildResultFlags["DeclarationOutputUnchanged"] = 2] = "DeclarationOutputUnchanged";
+        BuildResultFlags[BuildResultFlags["ConfigFileErrors"] = 4] = "ConfigFileErrors";
+        BuildResultFlags[BuildResultFlags["SyntaxErrors"] = 8] = "SyntaxErrors";
+        BuildResultFlags[BuildResultFlags["TypeErrors"] = 16] = "TypeErrors";
+        BuildResultFlags[BuildResultFlags["DeclarationEmitErrors"] = 32] = "DeclarationEmitErrors";
+        BuildResultFlags[BuildResultFlags["AnyErrors"] = 60] = "AnyErrors";
+    })(BuildResultFlags || (BuildResultFlags = {}));
+    var UpToDateStatusType;
+    (function (UpToDateStatusType) {
+        UpToDateStatusType[UpToDateStatusType["Unbuildable"] = 0] = "Unbuildable";
+        UpToDateStatusType[UpToDateStatusType["UpToDate"] = 1] = "UpToDate";
+        /**
+         * The project appears out of date because its upstream inputs are newer than its outputs,
+         * but all of its outputs are actually newer than the previous identical outputs of its (.d.ts) inputs.
+         * This means we can Pseudo-build (just touch timestamps), as if we had actually built this project.
+         */
+        UpToDateStatusType[UpToDateStatusType["UpToDateWithUpstreamTypes"] = 2] = "UpToDateWithUpstreamTypes";
+        UpToDateStatusType[UpToDateStatusType["OutputMissing"] = 3] = "OutputMissing";
+        UpToDateStatusType[UpToDateStatusType["OutOfDateWithSelf"] = 4] = "OutOfDateWithSelf";
+        UpToDateStatusType[UpToDateStatusType["OutOfDateWithUpstream"] = 5] = "OutOfDateWithUpstream";
+        UpToDateStatusType[UpToDateStatusType["UpstreamOutOfDate"] = 6] = "UpstreamOutOfDate";
+        UpToDateStatusType[UpToDateStatusType["UpstreamBlocked"] = 7] = "UpstreamBlocked";
+        /**
+         * Projects with no outputs (i.e. "solution" files)
+         */
+        UpToDateStatusType[UpToDateStatusType["ContainerOnly"] = 8] = "ContainerOnly";
+    })(UpToDateStatusType = ts.UpToDateStatusType || (ts.UpToDateStatusType = {}));
+    /**
+     * A FileMap maintains a normalized-key to value relationship
+     */
+    function createFileMap() {
+        // tslint:disable-next-line:no-null-keyword
+        var lookup = ts.createMap();
+        return {
+            setValue: setValue,
+            getValue: getValue,
+            getValueOrUndefined: getValueOrUndefined,
+            removeKey: removeKey,
+            getKeys: getKeys,
+            hasKey: hasKey
+        };
+        function getKeys() {
+            return Object.keys(lookup);
+        }
+        function hasKey(fileName) {
+            return lookup.has(ts.normalizePath(fileName));
+        }
+        function removeKey(fileName) {
+            lookup.delete(ts.normalizePath(fileName));
+        }
+        function setValue(fileName, value) {
+            lookup.set(ts.normalizePath(fileName), value);
+        }
+        function getValue(fileName) {
+            var f = ts.normalizePath(fileName);
+            if (lookup.has(f)) {
+                return lookup.get(f);
+            }
+            else {
+                throw new Error("No value corresponding to " + fileName + " exists in this map");
+            }
+        }
+        function getValueOrUndefined(fileName) {
+            var f = ts.normalizePath(fileName);
+            return lookup.get(f);
+        }
+    }
+    function createDependencyMapper() {
+        var childToParents = createFileMap();
+        var parentToChildren = createFileMap();
+        var allKeys = createFileMap();
+        function addReference(childConfigFileName, parentConfigFileName) {
+            addEntry(childToParents, childConfigFileName, parentConfigFileName);
+            addEntry(parentToChildren, parentConfigFileName, childConfigFileName);
+        }
+        function getReferencesTo(parentConfigFileName) {
+            return parentToChildren.getValueOrUndefined(parentConfigFileName) || [];
+        }
+        function getReferencesOf(childConfigFileName) {
+            return childToParents.getValueOrUndefined(childConfigFileName) || [];
+        }
+        function getKeys() {
+            return allKeys.getKeys();
+        }
+        function addEntry(mapToAddTo, key, element) {
+            key = ts.normalizePath(key);
+            element = ts.normalizePath(element);
+            var arr = mapToAddTo.getValueOrUndefined(key);
+            if (arr === undefined) {
+                mapToAddTo.setValue(key, arr = []);
+            }
+            if (arr.indexOf(element) < 0) {
+                arr.push(element);
+            }
+            allKeys.setValue(key, true);
+            allKeys.setValue(element, true);
+        }
+        return {
+            addReference: addReference,
+            getReferencesTo: getReferencesTo,
+            getReferencesOf: getReferencesOf,
+            getKeys: getKeys
+        };
+    }
+    ts.createDependencyMapper = createDependencyMapper;
+    function getOutputDeclarationFileName(inputFileName, configFile) {
+        var relativePath = ts.getRelativePathFromDirectory(rootDirOfOptions(configFile.options, configFile.options.configFilePath), inputFileName, /*ignoreCase*/ true);
+        var outputPath = ts.resolvePath(configFile.options.declarationDir || configFile.options.outDir || ts.getDirectoryPath(configFile.options.configFilePath), relativePath);
+        return ts.changeExtension(outputPath, ".d.ts" /* Dts */);
+    }
+    function getOutputJavaScriptFileName(inputFileName, configFile) {
+        var relativePath = ts.getRelativePathFromDirectory(rootDirOfOptions(configFile.options, configFile.options.configFilePath), inputFileName, /*ignoreCase*/ true);
+        var outputPath = ts.resolvePath(configFile.options.outDir || ts.getDirectoryPath(configFile.options.configFilePath), relativePath);
+        return ts.changeExtension(outputPath, (ts.fileExtensionIs(inputFileName, ".tsx" /* Tsx */) && configFile.options.jsx === 1 /* Preserve */) ? ".jsx" /* Jsx */ : ".js" /* Js */);
+    }
+    function getOutputFileNames(inputFileName, configFile) {
+        if (configFile.options.outFile) {
+            return ts.emptyArray;
+        }
+        var outputs = [];
+        outputs.push(getOutputJavaScriptFileName(inputFileName, configFile));
+        if (configFile.options.declaration) {
+            var dts = outputs.push(getOutputDeclarationFileName(inputFileName, configFile));
+            if (configFile.options.declarationMap) {
+                outputs.push(dts + ".map");
+            }
+        }
+        return outputs;
+    }
+    function getOutFileOutputs(project) {
+        if (!project.options.outFile) {
+            return ts.Debug.fail("outFile must be set");
+        }
+        var outputs = [];
+        outputs.push(project.options.outFile);
+        if (project.options.declaration) {
+            var dts = ts.changeExtension(project.options.outFile, ".d.ts" /* Dts */);
+            outputs.push(dts);
+            if (project.options.declarationMap) {
+                outputs.push(dts + ".map");
+            }
+        }
+        return outputs;
+    }
+    function rootDirOfOptions(opts, configFileName) {
+        return opts.rootDir || ts.getDirectoryPath(configFileName);
+    }
+    function createConfigFileCache(host) {
+        var cache = createFileMap();
+        var configParseHost = ts.parseConfigHostFromCompilerHost(host);
+        function parseConfigFile(configFilePath) {
+            var sourceFile = host.getSourceFile(configFilePath, 100 /* JSON */);
+            if (sourceFile === undefined) {
+                return undefined;
+            }
+            var parsed = ts.parseJsonSourceFileConfigFileContent(sourceFile, configParseHost, ts.getDirectoryPath(configFilePath));
+            parsed.options.configFilePath = configFilePath;
+            cache.setValue(configFilePath, parsed);
+            return parsed;
+        }
+        function removeKey(configFilePath) {
+            cache.removeKey(configFilePath);
+        }
+        return {
+            parseConfigFile: parseConfigFile,
+            removeKey: removeKey
+        };
+    }
+    function newer(date1, date2) {
+        return date2 > date1 ? date2 : date1;
+    }
+    function isDeclarationFile(fileName) {
+        return ts.fileExtensionIs(fileName, ".d.ts" /* Dts */);
+    }
+    function createBuildContext(options) {
+        var invalidatedProjects = createFileMap();
+        var queuedProjects = createFileMap();
+        var missingRoots = ts.createMap();
+        return {
+            options: options,
+            projectStatus: createFileMap(),
+            unchangedOutputs: createFileMap(),
+            invalidatedProjects: invalidatedProjects,
+            missingRoots: missingRoots,
+            queuedProjects: queuedProjects
+        };
+    }
+    ts.createBuildContext = createBuildContext;
+    var buildOpts = [
         {
-            name: "help",
-            shortName: "h",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
+            name: "verbose",
+            shortName: "v",
             category: ts.Diagnostics.Command_line_Options,
-            description: ts.Diagnostics.Print_this_message,
-        },
-        {
-            name: "help",
-            shortName: "?",
+            description: ts.Diagnostics.Enable_verbose_logging,
             type: "boolean"
         },
         {
-            name: "all",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
+            name: "dry",
+            shortName: "d",
             category: ts.Diagnostics.Command_line_Options,
-            description: ts.Diagnostics.Show_all_compiler_options,
+            description: ts.Diagnostics.Show_what_would_be_built_or_deleted_if_specified_with_clean,
+            type: "boolean"
         },
         {
-            name: "version",
-            shortName: "v",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
+            name: "force",
+            shortName: "f",
             category: ts.Diagnostics.Command_line_Options,
-            description: ts.Diagnostics.Print_the_compiler_s_version,
+            description: ts.Diagnostics.Build_all_projects_including_those_that_appear_to_be_up_to_date,
+            type: "boolean"
         },
         {
-            name: "init",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
+            name: "clean",
             category: ts.Diagnostics.Command_line_Options,
-            description: ts.Diagnostics.Initializes_a_TypeScript_project_and_creates_a_tsconfig_json_file,
-        },
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-            category: ts.Diagnostics.Command_line_Options,
-            paramType: ts.Diagnostics.FILE_OR_DIRECTORY,
-            description: ts.Diagnostics.Compile_the_project_given_the_path_to_its_configuration_file_or_to_a_folder_with_a_tsconfig_json,
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-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Command_line_Options,
-            description: ts.Diagnostics.Stylize_errors_and_messages_using_color_and_context_experimental
-        },
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-            type: "boolean",
-            showInSimplifiedHelpView: false,
-            category: ts.Diagnostics.Command_line_Options,
-            description: ts.Diagnostics.Whether_to_keep_outdated_console_output_in_watch_mode_instead_of_clearing_the_screen,
+            description: ts.Diagnostics.Delete_the_outputs_of_all_projects,
+            type: "boolean"
         },
         {
             name: "watch",
-            shortName: "w",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
             category: ts.Diagnostics.Command_line_Options,
             description: ts.Diagnostics.Watch_input_files,
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-            type: ts.createMapFromTemplate({
-                es3: 0,
-                es5: 1,
-                es6: 2,
-                es2015: 2,
-                es2016: 3,
-                es2017: 4,
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-                esnext: 6,
-            }),
-            paramType: ts.Diagnostics.VERSION,
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Specify_ECMAScript_target_version_Colon_ES3_default_ES5_ES2015_ES2016_ES2017_ES2018_or_ESNEXT,
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-            type: ts.createMapFromTemplate({
-                none: ts.ModuleKind.None,
-                commonjs: ts.ModuleKind.CommonJS,
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-                system: ts.ModuleKind.System,
-                umd: ts.ModuleKind.UMD,
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-            paramType: ts.Diagnostics.KIND,
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Specify_module_code_generation_Colon_none_commonjs_amd_system_umd_es2015_or_ESNext,
-        },
-        {
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-            type: "list",
-            element: {
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-                type: ts.createMapFromTemplate({
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-                    "es6": "lib.es2015.d.ts",
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-                    "es7": "lib.es2016.d.ts",
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-                    "es2017": "lib.es2017.d.ts",
-                    "es2018": "lib.es2018.d.ts",
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-                    "dom.iterable": "lib.dom.iterable.d.ts",
-                    "webworker": "lib.webworker.d.ts",
-                    "scripthost": "lib.scripthost.d.ts",
-                    "es2015.core": "lib.es2015.core.d.ts",
-                    "es2015.collection": "lib.es2015.collection.d.ts",
-                    "es2015.generator": "lib.es2015.generator.d.ts",
-                    "es2015.iterable": "lib.es2015.iterable.d.ts",
-                    "es2015.promise": "lib.es2015.promise.d.ts",
-                    "es2015.proxy": "lib.es2015.proxy.d.ts",
-                    "es2015.reflect": "lib.es2015.reflect.d.ts",
-                    "es2015.symbol": "lib.es2015.symbol.d.ts",
-                    "es2015.symbol.wellknown": "lib.es2015.symbol.wellknown.d.ts",
-                    "es2016.array.include": "lib.es2016.array.include.d.ts",
-                    "es2017.object": "lib.es2017.object.d.ts",
-                    "es2017.sharedmemory": "lib.es2017.sharedmemory.d.ts",
-                    "es2017.string": "lib.es2017.string.d.ts",
-                    "es2017.intl": "lib.es2017.intl.d.ts",
-                    "es2017.typedarrays": "lib.es2017.typedarrays.d.ts",
-                    "es2018.intl": "lib.es2018.intl.d.ts",
-                    "es2018.promise": "lib.es2018.promise.d.ts",
-                    "es2018.regexp": "lib.es2018.regexp.d.ts",
-                    "esnext.array": "lib.esnext.array.d.ts",
-                    "esnext.symbol": "lib.esnext.symbol.d.ts",
-                    "esnext.asynciterable": "lib.esnext.asynciterable.d.ts",
-                }),
-            },
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Specify_library_files_to_be_included_in_the_compilation
-        },
-        {
-            name: "allowJs",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Allow_javascript_files_to_be_compiled
-        },
-        {
-            name: "checkJs",
-            type: "boolean",
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Report_errors_in_js_files
-        },
-        {
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-            type: ts.createMapFromTemplate({
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-                "react-native": 3,
-                "react": 2
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-            paramType: ts.Diagnostics.KIND,
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Specify_JSX_code_generation_Colon_preserve_react_native_or_react,
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-        {
-            name: "declaration",
-            shortName: "d",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Generates_corresponding_d_ts_file,
-        },
-        {
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-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Generates_a_sourcemap_for_each_corresponding_d_ts_file,
-        },
-        {
-            name: "emitDeclarationOnly",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Only_emit_d_ts_declaration_files,
-        },
-        {
-            name: "sourceMap",
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-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Generates_corresponding_map_file,
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-            isFilePath: true,
-            paramType: ts.Diagnostics.FILE,
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Concatenate_and_emit_output_to_single_file,
-        },
-        {
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-            type: "string",
-            isFilePath: true,
-            paramType: ts.Diagnostics.DIRECTORY,
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Redirect_output_structure_to_the_directory,
-        },
-        {
-            name: "rootDir",
-            type: "string",
-            isFilePath: true,
-            paramType: ts.Diagnostics.LOCATION,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Specify_the_root_directory_of_input_files_Use_to_control_the_output_directory_structure_with_outDir,
-        },
-        {
-            name: "composite",
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-            isTSConfigOnly: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Enable_project_compilation,
-        },
-        {
-            name: "removeComments",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Do_not_emit_comments_to_output,
-        },
-        {
-            name: "noEmit",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Do_not_emit_outputs,
-        },
-        {
-            name: "importHelpers",
-            type: "boolean",
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Import_emit_helpers_from_tslib
-        },
-        {
-            name: "downlevelIteration",
-            type: "boolean",
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Provide_full_support_for_iterables_in_for_of_spread_and_destructuring_when_targeting_ES5_or_ES3
-        },
-        {
-            name: "isolatedModules",
-            type: "boolean",
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Transpile_each_file_as_a_separate_module_similar_to_ts_transpileModule
-        },
-        {
-            name: "strict",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Strict_Type_Checking_Options,
-            description: ts.Diagnostics.Enable_all_strict_type_checking_options
-        },
-        {
-            name: "noImplicitAny",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Strict_Type_Checking_Options,
-            description: ts.Diagnostics.Raise_error_on_expressions_and_declarations_with_an_implied_any_type,
-        },
-        {
-            name: "strictNullChecks",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Strict_Type_Checking_Options,
-            description: ts.Diagnostics.Enable_strict_null_checks
-        },
-        {
-            name: "strictFunctionTypes",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Strict_Type_Checking_Options,
-            description: ts.Diagnostics.Enable_strict_checking_of_function_types
-        },
-        {
-            name: "strictPropertyInitialization",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Strict_Type_Checking_Options,
-            description: ts.Diagnostics.Enable_strict_checking_of_property_initialization_in_classes
-        },
-        {
-            name: "noImplicitThis",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Strict_Type_Checking_Options,
-            description: ts.Diagnostics.Raise_error_on_this_expressions_with_an_implied_any_type,
-        },
-        {
-            name: "alwaysStrict",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Strict_Type_Checking_Options,
-            description: ts.Diagnostics.Parse_in_strict_mode_and_emit_use_strict_for_each_source_file
-        },
-        {
-            name: "noUnusedLocals",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Additional_Checks,
-            description: ts.Diagnostics.Report_errors_on_unused_locals,
-        },
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-            name: "noUnusedParameters",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Additional_Checks,
-            description: ts.Diagnostics.Report_errors_on_unused_parameters,
-        },
-        {
-            name: "noImplicitReturns",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Additional_Checks,
-            description: ts.Diagnostics.Report_error_when_not_all_code_paths_in_function_return_a_value
-        },
-        {
-            name: "noFallthroughCasesInSwitch",
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-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Additional_Checks,
-            description: ts.Diagnostics.Report_errors_for_fallthrough_cases_in_switch_statement
-        },
-        {
-            name: "moduleResolution",
-            type: ts.createMapFromTemplate({
-                node: ts.ModuleResolutionKind.NodeJs,
-                classic: ts.ModuleResolutionKind.Classic,
-            }),
-            paramType: ts.Diagnostics.STRATEGY,
-            category: ts.Diagnostics.Module_Resolution_Options,
-            description: ts.Diagnostics.Specify_module_resolution_strategy_Colon_node_Node_js_or_classic_TypeScript_pre_1_6,
-        },
-        {
-            name: "baseUrl",
-            type: "string",
-            isFilePath: true,
-            category: ts.Diagnostics.Module_Resolution_Options,
-            description: ts.Diagnostics.Base_directory_to_resolve_non_absolute_module_names
-        },
-        {
-            name: "paths",
-            type: "object",
-            isTSConfigOnly: true,
-            category: ts.Diagnostics.Module_Resolution_Options,
-            description: ts.Diagnostics.A_series_of_entries_which_re_map_imports_to_lookup_locations_relative_to_the_baseUrl
-        },
-        {
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-            isTSConfigOnly: true,
-            element: {
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-                type: "string",
-                isFilePath: true
-            },
-            category: ts.Diagnostics.Module_Resolution_Options,
-            description: ts.Diagnostics.List_of_root_folders_whose_combined_content_represents_the_structure_of_the_project_at_runtime
-        },
-        {
-            name: "typeRoots",
-            type: "list",
-            element: {
-                name: "typeRoots",
-                type: "string",
-                isFilePath: true
-            },
-            category: ts.Diagnostics.Module_Resolution_Options,
-            description: ts.Diagnostics.List_of_folders_to_include_type_definitions_from
-        },
-        {
-            name: "types",
-            type: "list",
-            element: {
-                name: "types",
-                type: "string"
-            },
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Module_Resolution_Options,
-            description: ts.Diagnostics.Type_declaration_files_to_be_included_in_compilation
-        },
-        {
-            name: "allowSyntheticDefaultImports",
-            type: "boolean",
-            category: ts.Diagnostics.Module_Resolution_Options,
-            description: ts.Diagnostics.Allow_default_imports_from_modules_with_no_default_export_This_does_not_affect_code_emit_just_typechecking
-        },
-        {
-            name: "esModuleInterop",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Module_Resolution_Options,
-            description: ts.Diagnostics.Enables_emit_interoperability_between_CommonJS_and_ES_Modules_via_creation_of_namespace_objects_for_all_imports_Implies_allowSyntheticDefaultImports
-        },
-        {
-            name: "preserveSymlinks",
-            type: "boolean",
-            category: ts.Diagnostics.Module_Resolution_Options,
-            description: ts.Diagnostics.Do_not_resolve_the_real_path_of_symlinks,
-        },
-        {
-            name: "sourceRoot",
-            type: "string",
-            isFilePath: true,
-            paramType: ts.Diagnostics.LOCATION,
-            category: ts.Diagnostics.Source_Map_Options,
-            description: ts.Diagnostics.Specify_the_location_where_debugger_should_locate_TypeScript_files_instead_of_source_locations,
-        },
-        {
-            name: "mapRoot",
-            type: "string",
-            isFilePath: true,
-            paramType: ts.Diagnostics.LOCATION,
-            category: ts.Diagnostics.Source_Map_Options,
-            description: ts.Diagnostics.Specify_the_location_where_debugger_should_locate_map_files_instead_of_generated_locations,
-        },
-        {
-            name: "inlineSourceMap",
-            type: "boolean",
-            category: ts.Diagnostics.Source_Map_Options,
-            description: ts.Diagnostics.Emit_a_single_file_with_source_maps_instead_of_having_a_separate_file
-        },
-        {
-            name: "inlineSources",
-            type: "boolean",
-            category: ts.Diagnostics.Source_Map_Options,
-            description: ts.Diagnostics.Emit_the_source_alongside_the_sourcemaps_within_a_single_file_requires_inlineSourceMap_or_sourceMap_to_be_set
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-        {
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-        {
-            name: "jsxFactory",
-            type: "string",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Specify_the_JSX_factory_function_to_use_when_targeting_react_JSX_emit_e_g_React_createElement_or_h
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-        {
-            name: "diagnostics",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Show_diagnostic_information
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-            category: ts.Diagnostics.Advanced_Options,
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-            description: ts.Diagnostics.Enable_tracing_of_the_name_resolution_process
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-        {
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-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Include_modules_imported_with_json_extension
-        },
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-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Print_names_of_files_part_of_the_compilation
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-            category: ts.Diagnostics.Advanced_Options,
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-        },
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-            isFilePath: false,
-            category: ts.Diagnostics.Advanced_Options,
-            paramType: ts.Diagnostics.FILE,
-            description: ts.Diagnostics.Deprecated_Use_outFile_instead_Concatenate_and_emit_output_to_single_file,
-        },
-        {
-            name: "reactNamespace",
-            type: "string",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Deprecated_Use_jsxFactory_instead_Specify_the_object_invoked_for_createElement_when_targeting_react_JSX_emit
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-            description: ts.Diagnostics.Deprecated_Use_skipLibCheck_instead_Skip_type_checking_of_default_library_declaration_files
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-            description: ts.Diagnostics.The_character_set_of_the_input_files
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-            category: ts.Diagnostics.Advanced_Options,
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-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Disallow_inconsistently_cased_references_to_the_same_file
-        },
-        {
-            name: "maxNodeModuleJsDepth",
-            type: "number",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.The_maximum_dependency_depth_to_search_under_node_modules_and_load_JavaScript_files
-        },
-        {
-            name: "noStrictGenericChecks",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Disable_strict_checking_of_generic_signatures_in_function_types,
-        },
-        {
-            name: "keyofStringsOnly",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Resolve_keyof_to_string_valued_property_names_only_no_numbers_or_symbols,
-        },
-        {
-            name: "plugins",
-            type: "list",
-            isTSConfigOnly: true,
-            element: {
-                name: "plugin",
-                type: "object"
-            },
-            description: ts.Diagnostics.List_of_language_service_plugins
+            type: "boolean"
         }
     ];
-    ts.typeAcquisitionDeclarations = [
-        {
-            name: "enableAutoDiscovery",
-            type: "boolean",
-        },
-        {
-            name: "enable",
-            type: "boolean",
-        },
-        {
-            name: "include",
-            type: "list",
-            element: {
-                name: "include",
-                type: "string"
+    function performBuild(args, compilerHost, buildHost, system) {
+        var verbose = false;
+        var dry = false;
+        var force = false;
+        var clean = false;
+        var watch = false;
+        var projects = [];
+        for (var _i = 0, args_3 = args; _i < args_3.length; _i++) {
+            var arg = args_3[_i];
+            switch (arg.toLowerCase()) {
+                case "-v":
+                case "--verbose":
+                    verbose = true;
+                    continue;
+                case "-d":
+                case "--dry":
+                    dry = true;
+                    continue;
+                case "-f":
+                case "--force":
+                    force = true;
+                    continue;
+                case "--clean":
+                    clean = true;
+                    continue;
+                case "--watch":
+                case "-w":
+                    watch = true;
+                    continue;
+                case "--?":
+                case "-?":
+                case "--help":
+                    return ts.printHelp(buildOpts, "--build ");
             }
-        },
-        {
-            name: "exclude",
-            type: "list",
-            element: {
-                name: "exclude",
-                type: "string"
+            // Not a flag, parse as filename
+            addProject(arg);
+        }
+        // Nonsensical combinations
+        if (clean && force) {
+            return buildHost.error(ts.Diagnostics.Options_0_and_1_cannot_be_combined, "clean", "force");
+        }
+        if (clean && verbose) {
+            return buildHost.error(ts.Diagnostics.Options_0_and_1_cannot_be_combined, "clean", "verbose");
+        }
+        if (clean && watch) {
+            return buildHost.error(ts.Diagnostics.Options_0_and_1_cannot_be_combined, "clean", "watch");
+        }
+        if (watch && dry) {
+            return buildHost.error(ts.Diagnostics.Options_0_and_1_cannot_be_combined, "watch", "dry");
+        }
+        if (projects.length === 0) {
+            // tsc -b invoked with no extra arguments; act as if invoked with "tsc -b ."
+            addProject(".");
+        }
+        var builder = createSolutionBuilder(compilerHost, buildHost, projects, { dry: dry, force: force, verbose: verbose }, system);
+        if (clean) {
+            builder.cleanAllProjects();
+        }
+        else {
+            builder.buildAllProjects();
+        }
+        if (watch) {
+            return builder.startWatching();
+        }
+        function addProject(projectSpecification) {
+            var fileName = ts.resolvePath(compilerHost.getCurrentDirectory(), projectSpecification);
+            var refPath = ts.resolveProjectReferencePath(compilerHost, { path: fileName });
+            if (!refPath) {
+                return buildHost.error(ts.Diagnostics.File_0_does_not_exist, projectSpecification);
             }
-        }
-    ];
-    ts.defaultInitCompilerOptions = {
-        module: ts.ModuleKind.CommonJS,
-        target: 1,
-        strict: true,
-        esModuleInterop: true
-    };
-    var optionNameMapCache;
-    function convertEnableAutoDiscoveryToEnable(typeAcquisition) {
-        if (typeAcquisition && typeAcquisition.enableAutoDiscovery !== undefined && typeAcquisition.enable === undefined) {
-            return {
-                enable: typeAcquisition.enableAutoDiscovery,
-                include: typeAcquisition.include || [],
-                exclude: typeAcquisition.exclude || []
-            };
-        }
-        return typeAcquisition;
-    }
-    ts.convertEnableAutoDiscoveryToEnable = convertEnableAutoDiscoveryToEnable;
-    function getOptionNameMap() {
-        if (optionNameMapCache) {
-            return optionNameMapCache;
-        }
-        var optionNameMap = ts.createMap();
-        var shortOptionNames = ts.createMap();
-        ts.forEach(ts.optionDeclarations, function (option) {
-            optionNameMap.set(option.name.toLowerCase(), option);
-            if (option.shortName) {
-                shortOptionNames.set(option.shortName, option.name);
+            if (!compilerHost.fileExists(refPath)) {
+                return buildHost.error(ts.Diagnostics.File_0_does_not_exist, fileName);
             }
-        });
-        optionNameMapCache = { optionNameMap: optionNameMap, shortOptionNames: shortOptionNames };
-        return optionNameMapCache;
-    }
-    function createCompilerDiagnosticForInvalidCustomType(opt) {
-        return createDiagnosticForInvalidCustomType(opt, ts.createCompilerDiagnostic);
-    }
-    ts.createCompilerDiagnosticForInvalidCustomType = createCompilerDiagnosticForInvalidCustomType;
-    function createDiagnosticForInvalidCustomType(opt, createDiagnostic) {
-        var namesOfType = ts.arrayFrom(opt.type.keys()).map(function (key) { return "'" + key + "'"; }).join(", ");
-        return createDiagnostic(ts.Diagnostics.Argument_for_0_option_must_be_Colon_1, "--" + opt.name, namesOfType);
-    }
-    function parseCustomTypeOption(opt, value, errors) {
-        return convertJsonOptionOfCustomType(opt, trimString(value || ""), errors);
-    }
-    ts.parseCustomTypeOption = parseCustomTypeOption;
-    function parseListTypeOption(opt, value, errors) {
-        if (value === void 0) { value = ""; }
-        value = trimString(value);
-        if (ts.startsWith(value, "-")) {
-            return undefined;
-        }
-        if (value === "") {
-            return [];
-        }
-        var values = value.split(",");
-        switch (opt.element.type) {
-            case "number":
-                return ts.map(values, parseInt);
-            case "string":
-                return ts.map(values, function (v) { return v || ""; });
-            default:
-                return ts.mapDefined(values, function (v) { return parseCustomTypeOption(opt.element, v, errors); });
+            projects.push(refPath);
         }
     }
-    ts.parseListTypeOption = parseListTypeOption;
-    function parseCommandLine(commandLine, readFile) {
-        var options = {};
-        var fileNames = [];
-        var projectReferences = undefined;
-        var errors = [];
-        parseStrings(commandLine);
+    ts.performBuild = performBuild;
+    /**
+     * A SolutionBuilder has an immutable set of rootNames that are the "entry point" projects, but
+     * can dynamically add/remove other projects based on changes on the rootNames' references
+     */
+    function createSolutionBuilder(compilerHost, buildHost, rootNames, defaultOptions, system) {
+        if (!compilerHost.getModifiedTime || !compilerHost.setModifiedTime) {
+            throw new Error("Host must support timestamp APIs");
+        }
+        var configFileCache = createConfigFileCache(compilerHost);
+        var context = createBuildContext(defaultOptions);
+        var existingWatchersForWildcards = ts.createMap();
         return {
-            options: options,
-            fileNames: fileNames,
-            projectReferences: projectReferences,
-            errors: errors
+            buildAllProjects: buildAllProjects,
+            getUpToDateStatus: getUpToDateStatus,
+            getUpToDateStatusOfFile: getUpToDateStatusOfFile,
+            cleanAllProjects: cleanAllProjects,
+            resetBuildContext: resetBuildContext,
+            getBuildGraph: getBuildGraph,
+            invalidateProject: invalidateProject,
+            buildInvalidatedProjects: buildInvalidatedProjects,
+            buildDependentInvalidatedProjects: buildDependentInvalidatedProjects,
+            resolveProjectName: resolveProjectName,
+            startWatching: startWatching
         };
-        function parseStrings(args) {
-            var i = 0;
-            while (i < args.length) {
-                var s = args[i];
-                i++;
-                if (s.charCodeAt(0) === 64) {
-                    parseResponseFile(s.slice(1));
-                }
-                else if (s.charCodeAt(0) === 45) {
-                    var opt = getOptionFromName(s.slice(s.charCodeAt(1) === 45 ? 2 : 1), true);
-                    if (opt) {
-                        if (opt.isTSConfigOnly) {
-                            errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Option_0_can_only_be_specified_in_tsconfig_json_file, opt.name));
-                        }
-                        else {
-                            if (!args[i] && opt.type !== "boolean") {
-                                errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Compiler_option_0_expects_an_argument, opt.name));
-                            }
-                            switch (opt.type) {
-                                case "number":
-                                    options[opt.name] = parseInt(args[i]);
-                                    i++;
-                                    break;
-                                case "boolean":
-                                    var optValue = args[i];
-                                    options[opt.name] = optValue !== "false";
-                                    if (optValue === "false" || optValue === "true") {
-                                        i++;
-                                    }
-                                    break;
-                                case "string":
-                                    options[opt.name] = args[i] || "";
-                                    i++;
-                                    break;
-                                case "list":
-                                    var result = parseListTypeOption(opt, args[i], errors);
-                                    options[opt.name] = result || [];
-                                    if (result) {
-                                        i++;
-                                    }
-                                    break;
-                                default:
-                                    options[opt.name] = parseCustomTypeOption(opt, args[i], errors);
-                                    i++;
-                                    break;
-                            }
-                        }
-                    }
-                    else {
-                        errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Unknown_compiler_option_0, s));
-                    }
-                }
-                else {
-                    fileNames.push(s);
-                }
-            }
-        }
-        function parseResponseFile(fileName) {
-            var text = readFile ? readFile(fileName) : ts.sys.readFile(fileName);
-            if (!text) {
-                errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.File_0_not_found, fileName));
+        function startWatching() {
+            if (!system)
+                throw new Error("System host must be provided if using --watch");
+            if (!system.watchFile || !system.watchDirectory || !system.setTimeout)
+                throw new Error("System host must support watchFile / watchDirectory / setTimeout if using --watch");
+            var graph = getGlobalDependencyGraph();
+            if (!graph.buildQueue) {
+                // Everything is broken - we don't even know what to watch. Give up.
                 return;
             }
-            var args = [];
-            var pos = 0;
-            while (true) {
-                while (pos < text.length && text.charCodeAt(pos) <= 32)
-                    pos++;
-                if (pos >= text.length)
-                    break;
-                var start = pos;
-                if (text.charCodeAt(start) === 34) {
-                    pos++;
-                    while (pos < text.length && text.charCodeAt(pos) !== 34)
-                        pos++;
-                    if (pos < text.length) {
-                        args.push(text.substring(start + 1, pos));
-                        pos++;
-                    }
-                    else {
-                        errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Unterminated_quoted_string_in_response_file_0, fileName));
-                    }
-                }
-                else {
-                    while (text.charCodeAt(pos) > 32)
-                        pos++;
-                    args.push(text.substring(start, pos));
-                }
-            }
-            parseStrings(args);
-        }
-    }
-    ts.parseCommandLine = parseCommandLine;
-    function getOptionFromName(optionName, allowShort) {
-        if (allowShort === void 0) { allowShort = false; }
-        optionName = optionName.toLowerCase();
-        var _a = getOptionNameMap(), optionNameMap = _a.optionNameMap, shortOptionNames = _a.shortOptionNames;
-        if (allowShort) {
-            var short = shortOptionNames.get(optionName);
-            if (short !== undefined) {
-                optionName = short;
-            }
-        }
-        return optionNameMap.get(optionName);
-    }
-    ts.getOptionFromName = getOptionFromName;
-    function getParsedCommandLineOfConfigFile(configFileName, optionsToExtend, host) {
-        var configFileText;
-        try {
-            configFileText = host.readFile(configFileName);
-        }
-        catch (e) {
-            var error = ts.createCompilerDiagnostic(ts.Diagnostics.Cannot_read_file_0_Colon_1, configFileName, e.message);
-            host.onUnRecoverableConfigFileDiagnostic(error);
-            return undefined;
-        }
-        if (!configFileText) {
-            var error = ts.createCompilerDiagnostic(ts.Diagnostics.File_0_not_found, configFileName);
-            host.onUnRecoverableConfigFileDiagnostic(error);
-            return undefined;
-        }
-        var result = ts.parseJsonText(configFileName, configFileText);
-        var cwd = host.getCurrentDirectory();
-        return parseJsonSourceFileConfigFileContent(result, host, ts.getNormalizedAbsolutePath(ts.getDirectoryPath(configFileName), cwd), optionsToExtend, ts.getNormalizedAbsolutePath(configFileName, cwd));
-    }
-    ts.getParsedCommandLineOfConfigFile = getParsedCommandLineOfConfigFile;
-    function readConfigFile(fileName, readFile) {
-        var textOrDiagnostic = tryReadFile(fileName, readFile);
-        return ts.isString(textOrDiagnostic) ? parseConfigFileTextToJson(fileName, textOrDiagnostic) : { config: {}, error: textOrDiagnostic };
-    }
-    ts.readConfigFile = readConfigFile;
-    function parseConfigFileTextToJson(fileName, jsonText) {
-        var jsonSourceFile = ts.parseJsonText(fileName, jsonText);
-        return {
-            config: convertToObject(jsonSourceFile, jsonSourceFile.parseDiagnostics),
-            error: jsonSourceFile.parseDiagnostics.length ? jsonSourceFile.parseDiagnostics[0] : undefined
-        };
-    }
-    ts.parseConfigFileTextToJson = parseConfigFileTextToJson;
-    function readJsonConfigFile(fileName, readFile) {
-        var textOrDiagnostic = tryReadFile(fileName, readFile);
-        return ts.isString(textOrDiagnostic) ? ts.parseJsonText(fileName, textOrDiagnostic) : { parseDiagnostics: [textOrDiagnostic] };
-    }
-    ts.readJsonConfigFile = readJsonConfigFile;
-    function tryReadFile(fileName, readFile) {
-        var text;
-        try {
-            text = readFile(fileName);
-        }
-        catch (e) {
-            return ts.createCompilerDiagnostic(ts.Diagnostics.Cannot_read_file_0_Colon_1, fileName, e.message);
-        }
-        return text === undefined ? ts.createCompilerDiagnostic(ts.Diagnostics.The_specified_path_does_not_exist_Colon_0, fileName) : text;
-    }
-    function commandLineOptionsToMap(options) {
-        return ts.arrayToMap(options, function (option) { return option.name; });
-    }
-    var _tsconfigRootOptions;
-    function getTsconfigRootOptionsMap() {
-        if (_tsconfigRootOptions === undefined) {
-            _tsconfigRootOptions = {
-                name: undefined,
-                type: "object",
-                elementOptions: commandLineOptionsToMap([
-                    {
-                        name: "compilerOptions",
-                        type: "object",
-                        elementOptions: commandLineOptionsToMap(ts.optionDeclarations),
-                        extraKeyDiagnosticMessage: ts.Diagnostics.Unknown_compiler_option_0
-                    },
-                    {
-                        name: "typingOptions",
-                        type: "object",
-                        elementOptions: commandLineOptionsToMap(ts.typeAcquisitionDeclarations),
-                        extraKeyDiagnosticMessage: ts.Diagnostics.Unknown_type_acquisition_option_0
-                    },
-                    {
-                        name: "typeAcquisition",
-                        type: "object",
-                        elementOptions: commandLineOptionsToMap(ts.typeAcquisitionDeclarations),
-                        extraKeyDiagnosticMessage: ts.Diagnostics.Unknown_type_acquisition_option_0
-                    },
-                    {
-                        name: "extends",
-                        type: "string"
-                    },
-                    {
-                        name: "references",
-                        type: "list",
-                        element: {
-                            name: "references",
-                            type: "object"
-                        }
-                    },
-                    {
-                        name: "files",
-                        type: "list",
-                        element: {
-                            name: "files",
-                            type: "string"
-                        }
-                    },
-                    {
-                        name: "include",
-                        type: "list",
-                        element: {
-                            name: "include",
-                            type: "string"
-                        }
-                    },
-                    {
-                        name: "exclude",
-                        type: "list",
-                        element: {
-                            name: "exclude",
-                            type: "string"
-                        }
-                    },
-                    ts.compileOnSaveCommandLineOption
-                ])
-            };
-        }
-        return _tsconfigRootOptions;
-    }
-    function convertToObject(sourceFile, errors) {
-        return convertToObjectWorker(sourceFile, errors, true, undefined, undefined);
-    }
-    ts.convertToObject = convertToObject;
-    function convertToObjectWorker(sourceFile, errors, returnValue, knownRootOptions, jsonConversionNotifier) {
-        if (!sourceFile.statements.length) {
-            return returnValue ? {} : undefined;
-        }
-        return convertPropertyValueToJson(sourceFile.statements[0].expression, knownRootOptions);
-        function isRootOptionMap(knownOptions) {
-            return knownRootOptions && knownRootOptions.elementOptions === knownOptions;
-        }
-        function convertObjectLiteralExpressionToJson(node, knownOptions, extraKeyDiagnosticMessage, parentOption) {
-            var result = returnValue ? {} : undefined;
-            for (var _i = 0, _a = node.properties; _i < _a.length; _i++) {
-                var element = _a[_i];
-                if (element.kind !== 270) {
-                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, element, ts.Diagnostics.Property_assignment_expected));
-                    continue;
-                }
-                if (element.questionToken) {
-                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, element.questionToken, ts.Diagnostics._0_can_only_be_used_in_a_ts_file, "?"));
-                }
-                if (!isDoubleQuotedString(element.name)) {
-                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, element.name, ts.Diagnostics.String_literal_with_double_quotes_expected));
-                }
-                var keyText = ts.unescapeLeadingUnderscores(ts.getTextOfPropertyName(element.name));
-                var option = knownOptions ? knownOptions.get(keyText) : undefined;
-                if (extraKeyDiagnosticMessage && !option) {
-                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, element.name, extraKeyDiagnosticMessage, keyText));
-                }
-                var value = convertPropertyValueToJson(element.initializer, option);
-                if (typeof keyText !== "undefined") {
-                    if (returnValue) {
-                        result[keyText] = value;
-                    }
-                    if (jsonConversionNotifier &&
-                        (parentOption || isRootOptionMap(knownOptions))) {
-                        var isValidOptionValue = isCompilerOptionsValue(option, value);
-                        if (parentOption) {
-                            if (isValidOptionValue) {
-                                jsonConversionNotifier.onSetValidOptionKeyValueInParent(parentOption, option, value);
-                            }
-                        }
-                        else if (isRootOptionMap(knownOptions)) {
-                            if (isValidOptionValue) {
-                                jsonConversionNotifier.onSetValidOptionKeyValueInRoot(keyText, element.name, value, element.initializer);
-                            }
-                            else if (!option) {
-                                jsonConversionNotifier.onSetUnknownOptionKeyValueInRoot(keyText, element.name, value, element.initializer);
-                            }
-                        }
-                    }
-                }
-            }
-            return result;
-        }
-        function convertArrayLiteralExpressionToJson(elements, elementOption) {
-            return (returnValue ? elements.map : elements.forEach).call(elements, function (element) { return convertPropertyValueToJson(element, elementOption); });
-        }
-        function convertPropertyValueToJson(valueExpression, option) {
-            switch (valueExpression.kind) {
-                case 101:
-                    reportInvalidOptionValue(option && option.type !== "boolean");
-                    return true;
-                case 86:
-                    reportInvalidOptionValue(option && option.type !== "boolean");
-                    return false;
-                case 95:
-                    reportInvalidOptionValue(option && option.name === "extends");
-                    return null;
-                case 9:
-                    if (!isDoubleQuotedString(valueExpression)) {
-                        errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, valueExpression, ts.Diagnostics.String_literal_with_double_quotes_expected));
-                    }
-                    reportInvalidOptionValue(option && (ts.isString(option.type) && option.type !== "string"));
-                    var text = valueExpression.text;
-                    if (option && !ts.isString(option.type)) {
-                        var customOption = option;
-                        if (!customOption.type.has(text.toLowerCase())) {
-                            errors.push(createDiagnosticForInvalidCustomType(customOption, function (message, arg0, arg1) { return ts.createDiagnosticForNodeInSourceFile(sourceFile, valueExpression, message, arg0, arg1); }));
-                        }
-                    }
-                    return text;
-                case 8:
-                    reportInvalidOptionValue(option && option.type !== "number");
-                    return Number(valueExpression.text);
-                case 198:
-                    if (valueExpression.operator !== 38 || valueExpression.operand.kind !== 8) {
-                        break;
-                    }
-                    reportInvalidOptionValue(option && option.type !== "number");
-                    return -Number(valueExpression.operand.text);
-                case 184:
-                    reportInvalidOptionValue(option && option.type !== "object");
-                    var objectLiteralExpression = valueExpression;
-                    if (option) {
-                        var _a = option, elementOptions = _a.elementOptions, extraKeyDiagnosticMessage = _a.extraKeyDiagnosticMessage, optionName = _a.name;
-                        return convertObjectLiteralExpressionToJson(objectLiteralExpression, elementOptions, extraKeyDiagnosticMessage, optionName);
-                    }
-                    else {
-                        return convertObjectLiteralExpressionToJson(objectLiteralExpression, undefined, undefined, undefined);
-                    }
-                case 183:
-                    reportInvalidOptionValue(option && option.type !== "list");
-                    return convertArrayLiteralExpressionToJson(valueExpression.elements, option && option.element);
-            }
-            if (option) {
-                reportInvalidOptionValue(true);
-            }
-            else {
-                errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, valueExpression, ts.Diagnostics.Property_value_can_only_be_string_literal_numeric_literal_true_false_null_object_literal_or_array_literal));
-            }
-            return undefined;
-            function reportInvalidOptionValue(isError) {
-                if (isError) {
-                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, valueExpression, ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, option.name, getCompilerOptionValueTypeString(option)));
-                }
-            }
-        }
-        function isDoubleQuotedString(node) {
-            return ts.isStringLiteral(node) && ts.isStringDoubleQuoted(node, sourceFile);
-        }
-    }
-    ts.convertToObjectWorker = convertToObjectWorker;
-    function getCompilerOptionValueTypeString(option) {
-        return option.type === "list" ?
-            "Array" :
-            ts.isString(option.type) ? option.type : "string";
-    }
-    function isCompilerOptionsValue(option, value) {
-        if (option) {
-            if (isNullOrUndefined(value))
-                return true;
-            if (option.type === "list") {
-                return ts.isArray(value);
-            }
-            var expectedType = ts.isString(option.type) ? option.type : "string";
-            return typeof value === expectedType;
-        }
-        return false;
-    }
-    function generateTSConfig(options, fileNames, newLine) {
-        var compilerOptions = ts.extend(options, ts.defaultInitCompilerOptions);
-        var compilerOptionsMap = serializeCompilerOptions(compilerOptions);
-        return writeConfigurations();
-        function getCustomTypeMapOfCommandLineOption(optionDefinition) {
-            if (optionDefinition.type === "string" || optionDefinition.type === "number" || optionDefinition.type === "boolean") {
-                return undefined;
-            }
-            else if (optionDefinition.type === "list") {
-                return getCustomTypeMapOfCommandLineOption(optionDefinition.element);
-            }
-            else {
-                return optionDefinition.type;
-            }
-        }
-        function getNameOfCompilerOptionValue(value, customTypeMap) {
-            return ts.forEachEntry(customTypeMap, function (mapValue, key) {
-                if (mapValue === value) {
-                    return key;
-                }
-            });
-        }
-        function serializeCompilerOptions(options) {
-            var result = ts.createMap();
-            var optionsNameMap = getOptionNameMap().optionNameMap;
-            var _loop_11 = function (name) {
-                if (ts.hasProperty(options, name)) {
-                    if (optionsNameMap.has(name) && optionsNameMap.get(name).category === ts.Diagnostics.Command_line_Options) {
-                        return "continue";
-                    }
-                    var value = options[name];
-                    var optionDefinition = optionsNameMap.get(name.toLowerCase());
-                    if (optionDefinition) {
-                        var customTypeMap_1 = getCustomTypeMapOfCommandLineOption(optionDefinition);
-                        if (!customTypeMap_1) {
-                            result.set(name, value);
-                        }
-                        else {
-                            if (optionDefinition.type === "list") {
-                                result.set(name, value.map(function (element) { return getNameOfCompilerOptionValue(element, customTypeMap_1); }));
-                            }
-                            else {
-                                result.set(name, getNameOfCompilerOptionValue(value, customTypeMap_1));
-                            }
-                        }
-                    }
-                }
-            };
-            for (var name in options) {
-                _loop_11(name);
-            }
-            return result;
-        }
-        function getDefaultValueForOption(option) {
-            switch (option.type) {
-                case "number":
-                    return 1;
-                case "boolean":
-                    return true;
-                case "string":
-                    return option.isFilePath ? "./" : "";
-                case "list":
-                    return [];
-                case "object":
-                    return {};
-                default:
-                    return option.type.keys().next().value;
-            }
-        }
-        function makePadding(paddingLength) {
-            return Array(paddingLength + 1).join(" ");
-        }
-        function isAllowedOption(_a) {
-            var category = _a.category, name = _a.name;
-            return category !== undefined
-                && category !== ts.Diagnostics.Command_line_Options
-                && (category !== ts.Diagnostics.Advanced_Options || compilerOptionsMap.has(name));
-        }
-        function writeConfigurations() {
-            var categorizedOptions = ts.createMultiMap();
-            for (var _i = 0, optionDeclarations_1 = ts.optionDeclarations; _i < optionDeclarations_1.length; _i++) {
-                var option = optionDeclarations_1[_i];
-                var category = option.category;
-                if (isAllowedOption(option)) {
-                    categorizedOptions.add(ts.getLocaleSpecificMessage(category), option);
-                }
-            }
-            var marginLength = 0;
-            var seenKnownKeys = 0;
-            var nameColumn = [];
-            var descriptionColumn = [];
-            categorizedOptions.forEach(function (options, category) {
-                if (nameColumn.length !== 0) {
-                    nameColumn.push("");
-                    descriptionColumn.push("");
-                }
-                nameColumn.push("/* " + category + " */");
-                descriptionColumn.push("");
-                for (var _i = 0, options_1 = options; _i < options_1.length; _i++) {
-                    var option = options_1[_i];
-                    var optionName = void 0;
-                    if (compilerOptionsMap.has(option.name)) {
-                        optionName = "\"" + option.name + "\": " + JSON.stringify(compilerOptionsMap.get(option.name)) + ((seenKnownKeys += 1) === compilerOptionsMap.size ? "" : ",");
-                    }
-                    else {
-                        optionName = "// \"" + option.name + "\": " + JSON.stringify(getDefaultValueForOption(option)) + ",";
-                    }
-                    nameColumn.push(optionName);
-                    descriptionColumn.push("/* " + (option.description && ts.getLocaleSpecificMessage(option.description) || option.name) + " */");
-                    marginLength = Math.max(optionName.length, marginLength);
-                }
-            });
-            var tab = makePadding(2);
-            var result = [];
-            result.push("{");
-            result.push(tab + "\"compilerOptions\": {");
-            for (var i = 0; i < nameColumn.length; i++) {
-                var optionName = nameColumn[i];
-                var description = descriptionColumn[i];
-                result.push(optionName && "" + tab + tab + optionName + (description && (makePadding(marginLength - optionName.length + 2) + description)));
-            }
-            if (fileNames.length) {
-                result.push(tab + "},");
-                result.push(tab + "\"files\": [");
-                for (var i = 0; i < fileNames.length; i++) {
-                    result.push("" + tab + tab + JSON.stringify(fileNames[i]) + (i === fileNames.length - 1 ? "" : ","));
-                }
-                result.push(tab + "]");
-            }
-            else {
-                result.push(tab + "}");
-            }
-            result.push("}");
-            return result.join(newLine);
-        }
-    }
-    ts.generateTSConfig = generateTSConfig;
-    function parseJsonConfigFileContent(json, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions) {
-        return parseJsonConfigFileContentWorker(json, undefined, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions);
-    }
-    ts.parseJsonConfigFileContent = parseJsonConfigFileContent;
-    function parseJsonSourceFileConfigFileContent(sourceFile, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions) {
-        return parseJsonConfigFileContentWorker(undefined, sourceFile, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions);
-    }
-    ts.parseJsonSourceFileConfigFileContent = parseJsonSourceFileConfigFileContent;
-    function setConfigFileInOptions(options, configFile) {
-        if (configFile) {
-            Object.defineProperty(options, "configFile", { enumerable: false, writable: false, value: configFile });
-        }
-    }
-    ts.setConfigFileInOptions = setConfigFileInOptions;
-    function isNullOrUndefined(x) {
-        return x === undefined || x === null;
-    }
-    function directoryOfCombinedPath(fileName, basePath) {
-        return ts.getDirectoryPath(ts.getNormalizedAbsolutePath(fileName, basePath));
-    }
-    function parseJsonConfigFileContentWorker(json, sourceFile, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions) {
-        if (existingOptions === void 0) { existingOptions = {}; }
-        if (resolutionStack === void 0) { resolutionStack = []; }
-        if (extraFileExtensions === void 0) { extraFileExtensions = []; }
-        ts.Debug.assert((json === undefined && sourceFile !== undefined) || (json !== undefined && sourceFile === undefined));
-        var errors = [];
-        var parsedConfig = parseConfig(json, sourceFile, host, basePath, configFileName, resolutionStack, errors);
-        var raw = parsedConfig.raw;
-        var options = ts.extend(existingOptions, parsedConfig.options || {});
-        options.configFilePath = configFileName && ts.normalizeSlashes(configFileName);
-        setConfigFileInOptions(options, sourceFile);
-        var _a = getFileNames(), fileNames = _a.fileNames, wildcardDirectories = _a.wildcardDirectories, spec = _a.spec, projectReferences = _a.projectReferences;
-        return {
-            options: options,
-            fileNames: fileNames,
-            projectReferences: projectReferences,
-            typeAcquisition: parsedConfig.typeAcquisition || getDefaultTypeAcquisition(),
-            raw: raw,
-            errors: errors,
-            wildcardDirectories: wildcardDirectories,
-            compileOnSave: !!raw.compileOnSave,
-            configFileSpecs: spec
-        };
-        function getFileNames() {
-            var filesSpecs;
-            if (ts.hasProperty(raw, "files") && !isNullOrUndefined(raw.files)) {
-                if (ts.isArray(raw.files)) {
-                    filesSpecs = raw.files;
-                    if (filesSpecs.length === 0) {
-                        createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.The_files_list_in_config_file_0_is_empty, configFileName || "tsconfig.json");
-                    }
-                }
-                else {
-                    createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "files", "Array");
-                }
-            }
-            var includeSpecs;
-            if (ts.hasProperty(raw, "include") && !isNullOrUndefined(raw.include)) {
-                if (ts.isArray(raw.include)) {
-                    includeSpecs = raw.include;
-                }
-                else {
-                    createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "include", "Array");
-                }
-            }
-            var excludeSpecs;
-            if (ts.hasProperty(raw, "exclude") && !isNullOrUndefined(raw.exclude)) {
-                if (ts.isArray(raw.exclude)) {
-                    excludeSpecs = raw.exclude;
-                }
-                else {
-                    createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "exclude", "Array");
-                }
-            }
-            else if (raw.compilerOptions) {
-                var outDir = raw.compilerOptions.outDir;
-                var declarationDir = raw.compilerOptions.declarationDir;
-                if (outDir || declarationDir) {
-                    excludeSpecs = [outDir, declarationDir].filter(function (d) { return !!d; });
-                }
-            }
-            if (filesSpecs === undefined && includeSpecs === undefined) {
-                includeSpecs = ["**/*"];
-            }
-            var result = matchFileNames(filesSpecs, includeSpecs, excludeSpecs, configFileName ? directoryOfCombinedPath(configFileName, basePath) : basePath, options, host, errors, extraFileExtensions, sourceFile);
-            if (result.fileNames.length === 0 && !ts.hasProperty(raw, "files") && resolutionStack.length === 0 && !ts.hasProperty(raw, "references")) {
-                errors.push(getErrorForNoInputFiles(result.spec, configFileName));
-            }
-            if (ts.hasProperty(raw, "references") && !isNullOrUndefined(raw.references)) {
-                if (ts.isArray(raw.references)) {
-                    var references = [];
-                    for (var _i = 0, _a = raw.references; _i < _a.length; _i++) {
-                        var ref = _a[_i];
-                        if (typeof ref.path !== "string") {
-                            createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "reference.path", "string");
-                        }
-                        else {
-                            references.push({
-                                path: ts.getNormalizedAbsolutePath(ref.path, basePath),
-                                originalPath: ref.path,
-                                prepend: ref.prepend,
-                                circular: ref.circular
-                            });
-                        }
-                    }
-                    result.projectReferences = references;
-                }
-                else {
-                    createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "references", "Array");
-                }
-            }
-            return result;
-        }
-        function createCompilerDiagnosticOnlyIfJson(message, arg0, arg1) {
-            if (!sourceFile) {
-                errors.push(ts.createCompilerDiagnostic(message, arg0, arg1));
-            }
-        }
-    }
-    function isErrorNoInputFiles(error) {
-        return error.code === ts.Diagnostics.No_inputs_were_found_in_config_file_0_Specified_include_paths_were_1_and_exclude_paths_were_2.code;
-    }
-    ts.isErrorNoInputFiles = isErrorNoInputFiles;
-    function getErrorForNoInputFiles(_a, configFileName) {
-        var includeSpecs = _a.includeSpecs, excludeSpecs = _a.excludeSpecs;
-        return ts.createCompilerDiagnostic(ts.Diagnostics.No_inputs_were_found_in_config_file_0_Specified_include_paths_were_1_and_exclude_paths_were_2, configFileName || "tsconfig.json", JSON.stringify(includeSpecs || []), JSON.stringify(excludeSpecs || []));
-    }
-    ts.getErrorForNoInputFiles = getErrorForNoInputFiles;
-    function isSuccessfulParsedTsconfig(value) {
-        return !!value.options;
-    }
-    function parseConfig(json, sourceFile, host, basePath, configFileName, resolutionStack, errors) {
-        basePath = ts.normalizeSlashes(basePath);
-        var resolvedPath = ts.getNormalizedAbsolutePath(configFileName || "", basePath);
-        if (resolutionStack.indexOf(resolvedPath) >= 0) {
-            errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Circularity_detected_while_resolving_configuration_Colon_0, resolutionStack.concat([resolvedPath]).join(" -> ")));
-            return { raw: json || convertToObject(sourceFile, errors) };
-        }
-        var ownConfig = json ?
-            parseOwnConfigOfJson(json, host, basePath, configFileName, errors) :
-            parseOwnConfigOfJsonSourceFile(sourceFile, host, basePath, configFileName, errors);
-        if (ownConfig.extendedConfigPath) {
-            resolutionStack = resolutionStack.concat([resolvedPath]);
-            var extendedConfig = getExtendedConfig(sourceFile, ownConfig.extendedConfigPath, host, basePath, resolutionStack, errors);
-            if (extendedConfig && isSuccessfulParsedTsconfig(extendedConfig)) {
-                var baseRaw_1 = extendedConfig.raw;
-                var raw_1 = ownConfig.raw;
-                var setPropertyInRawIfNotUndefined = function (propertyName) {
-                    var value = raw_1[propertyName] || baseRaw_1[propertyName];
-                    if (value) {
-                        raw_1[propertyName] = value;
-                    }
-                };
-                setPropertyInRawIfNotUndefined("include");
-                setPropertyInRawIfNotUndefined("exclude");
-                setPropertyInRawIfNotUndefined("files");
-                if (raw_1.compileOnSave === undefined) {
-                    raw_1.compileOnSave = baseRaw_1.compileOnSave;
-                }
-                ownConfig.options = ts.assign({}, extendedConfig.options, ownConfig.options);
-            }
-        }
-        return ownConfig;
-    }
-    function parseOwnConfigOfJson(json, host, basePath, configFileName, errors) {
-        if (ts.hasProperty(json, "excludes")) {
-            errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Unknown_option_excludes_Did_you_mean_exclude));
-        }
-        var options = convertCompilerOptionsFromJsonWorker(json.compilerOptions, basePath, errors, configFileName);
-        var typeAcquisition = convertTypeAcquisitionFromJsonWorker(json.typeAcquisition || json.typingOptions, basePath, errors, configFileName);
-        json.compileOnSave = convertCompileOnSaveOptionFromJson(json, basePath, errors);
-        var extendedConfigPath;
-        if (json.extends) {
-            if (!ts.isString(json.extends)) {
-                errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "extends", "string"));
-            }
-            else {
-                var newBase = configFileName ? directoryOfCombinedPath(configFileName, basePath) : basePath;
-                extendedConfigPath = getExtendsConfigPath(json.extends, host, newBase, errors, ts.createCompilerDiagnostic);
-            }
-        }
-        return { raw: json, options: options, typeAcquisition: typeAcquisition, extendedConfigPath: extendedConfigPath };
-    }
-    function parseOwnConfigOfJsonSourceFile(sourceFile, host, basePath, configFileName, errors) {
-        var options = getDefaultCompilerOptions(configFileName);
-        var typeAcquisition, typingOptionstypeAcquisition;
-        var extendedConfigPath;
-        var optionsIterator = {
-            onSetValidOptionKeyValueInParent: function (parentOption, option, value) {
-                ts.Debug.assert(parentOption === "compilerOptions" || parentOption === "typeAcquisition" || parentOption === "typingOptions");
-                var currentOption = parentOption === "compilerOptions" ?
-                    options :
-                    parentOption === "typeAcquisition" ?
-                        (typeAcquisition || (typeAcquisition = getDefaultTypeAcquisition(configFileName))) :
-                        (typingOptionstypeAcquisition || (typingOptionstypeAcquisition = getDefaultTypeAcquisition(configFileName)));
-                currentOption[option.name] = normalizeOptionValue(option, basePath, value);
-            },
-            onSetValidOptionKeyValueInRoot: function (key, _keyNode, value, valueNode) {
-                switch (key) {
-                    case "extends":
-                        var newBase = configFileName ? directoryOfCombinedPath(configFileName, basePath) : basePath;
-                        extendedConfigPath = getExtendsConfigPath(value, host, newBase, errors, function (message, arg0) {
-                            return ts.createDiagnosticForNodeInSourceFile(sourceFile, valueNode, message, arg0);
+            var _loop_9 = function (resolved) {
+                var cfg = configFileCache.parseConfigFile(resolved);
+                if (cfg) {
+                    // Watch this file
+                    system.watchFile(resolved, function () {
+                        configFileCache.removeKey(resolved);
+                        invalidateProjectAndScheduleBuilds(resolved);
+                    });
+                    // Update watchers for wildcard directories
+                    if (cfg.configFileSpecs) {
+                        ts.updateWatchingWildcardDirectories(existingWatchersForWildcards, ts.createMapFromTemplate(cfg.configFileSpecs.wildcardDirectories), function (dir, flags) {
+                            return system.watchDirectory(dir, function () {
+                                invalidateProjectAndScheduleBuilds(resolved);
+                            }, !!(flags & 1 /* Recursive */));
                         });
-                        return;
-                    case "files":
-                        if (value.length === 0) {
-                            errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, valueNode, ts.Diagnostics.The_files_list_in_config_file_0_is_empty, configFileName || "tsconfig.json"));
-                        }
-                        return;
+                    }
+                    // Watch input files
+                    for (var _i = 0, _a = cfg.fileNames; _i < _a.length; _i++) {
+                        var input = _a[_i];
+                        system.watchFile(input, function () {
+                            invalidateProjectAndScheduleBuilds(resolved);
+                        });
+                    }
                 }
-            },
-            onSetUnknownOptionKeyValueInRoot: function (key, keyNode, _value, _valueNode) {
-                if (key === "excludes") {
-                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, keyNode, ts.Diagnostics.Unknown_option_excludes_Did_you_mean_exclude));
+            };
+            for (var _i = 0, _a = graph.buildQueue; _i < _a.length; _i++) {
+                var resolved = _a[_i];
+                _loop_9(resolved);
+            }
+            function invalidateProjectAndScheduleBuilds(resolved) {
+                invalidateProject(resolved);
+                system.setTimeout(buildInvalidatedProjects, 100);
+                system.setTimeout(buildDependentInvalidatedProjects, 3000);
+            }
+        }
+        function resetBuildContext(opts) {
+            if (opts === void 0) { opts = defaultOptions; }
+            context = createBuildContext(opts);
+        }
+        function getUpToDateStatusOfFile(configFileName) {
+            return getUpToDateStatus(configFileCache.parseConfigFile(configFileName));
+        }
+        function getBuildGraph(configFileNames) {
+            var resolvedNames = resolveProjectNames(configFileNames);
+            if (resolvedNames === undefined)
+                return undefined;
+            return createDependencyGraph(resolvedNames);
+        }
+        function getGlobalDependencyGraph() {
+            return getBuildGraph(rootNames);
+        }
+        function getUpToDateStatus(project) {
+            if (project === undefined) {
+                return { type: UpToDateStatusType.Unbuildable, reason: "File deleted mid-build" };
+            }
+            var prior = context.projectStatus.getValueOrUndefined(project.options.configFilePath);
+            if (prior !== undefined) {
+                return prior;
+            }
+            var actual = getUpToDateStatusWorker(project);
+            context.projectStatus.setValue(project.options.configFilePath, actual);
+            return actual;
+        }
+        function invalidateProject(configFileName) {
+            var resolved = resolveProjectName(configFileName);
+            if (resolved === undefined) {
+                // If this was a rootName, we need to track it as missing.
+                // Otherwise we can just ignore it and have it possibly surface as an error in any downstream projects,
+                // if they exist
+                // TODO: do those things
+                return;
+            }
+            configFileCache.removeKey(resolved);
+            context.invalidatedProjects.setValue(resolved, true);
+            context.projectStatus.removeKey(resolved);
+            var graph = getGlobalDependencyGraph();
+            if (graph) {
+                queueBuildForDownstreamReferences(resolved);
+            }
+            // Mark all downstream projects of this one needing to be built "later"
+            function queueBuildForDownstreamReferences(root) {
+                debugger;
+                var deps = graph.dependencyMap.getReferencesTo(root);
+                for (var _i = 0, deps_1 = deps; _i < deps_1.length; _i++) {
+                    var ref = deps_1[_i];
+                    // Can skip circular references
+                    if (!context.queuedProjects.hasKey(ref)) {
+                        context.queuedProjects.setValue(ref, true);
+                        queueBuildForDownstreamReferences(ref);
+                    }
                 }
             }
-        };
-        var json = convertToObjectWorker(sourceFile, errors, true, getTsconfigRootOptionsMap(), optionsIterator);
-        if (!typeAcquisition) {
-            if (typingOptionstypeAcquisition) {
-                typeAcquisition = (typingOptionstypeAcquisition.enableAutoDiscovery !== undefined) ?
-                    {
-                        enable: typingOptionstypeAcquisition.enableAutoDiscovery,
-                        include: typingOptionstypeAcquisition.include,
-                        exclude: typingOptionstypeAcquisition.exclude
-                    } :
-                    typingOptionstypeAcquisition;
+        }
+        function buildInvalidatedProjects() {
+            buildSomeProjects(function (p) { return context.invalidatedProjects.hasKey(p); });
+        }
+        function buildDependentInvalidatedProjects() {
+            buildSomeProjects(function (p) { return context.queuedProjects.hasKey(p); });
+        }
+        function buildSomeProjects(predicate) {
+            var resolvedNames = resolveProjectNames(rootNames);
+            if (resolvedNames === undefined)
+                return;
+            var graph = createDependencyGraph(resolvedNames);
+            for (var _i = 0, _a = graph.buildQueue; _i < _a.length; _i++) {
+                var next = _a[_i];
+                if (!predicate(next))
+                    continue;
+                var resolved = resolveProjectName(next);
+                if (!resolved)
+                    continue; // ??
+                var proj = configFileCache.parseConfigFile(resolved);
+                if (!proj)
+                    continue; // ?
+                var status = getUpToDateStatus(proj);
+                verboseReportProjectStatus(next, status);
+                if (status.type === UpToDateStatusType.UpstreamBlocked) {
+                    if (context.options.verbose)
+                        buildHost.verbose(ts.Diagnostics.Skipping_build_of_project_0_because_its_dependency_1_has_errors, resolved, status.upstreamProjectName);
+                    continue;
+                }
+                buildSingleProject(next);
+            }
+        }
+        function getAllProjectOutputs(project) {
+            if (project.options.outFile) {
+                return getOutFileOutputs(project);
             }
             else {
-                typeAcquisition = getDefaultTypeAcquisition(configFileName);
+                var outputs = [];
+                for (var _i = 0, _a = project.fileNames; _i < _a.length; _i++) {
+                    var inputFile = _a[_i];
+                    outputs.push.apply(outputs, getOutputFileNames(inputFile, project));
+                }
+                return outputs;
             }
         }
-        return { raw: json, options: options, typeAcquisition: typeAcquisition, extendedConfigPath: extendedConfigPath };
-    }
-    function getExtendsConfigPath(extendedConfig, host, basePath, errors, createDiagnostic) {
-        extendedConfig = ts.normalizeSlashes(extendedConfig);
-        if (!(ts.isRootedDiskPath(extendedConfig) || ts.startsWith(extendedConfig, "./") || ts.startsWith(extendedConfig, "../"))) {
-            errors.push(createDiagnostic(ts.Diagnostics.A_path_in_an_extends_option_must_be_relative_or_rooted_but_0_is_not, extendedConfig));
-            return undefined;
+        function getUpToDateStatusWorker(project) {
+            var newestInputFileName = undefined;
+            var newestInputFileTime = minimumDate;
+            // Get timestamps of input files
+            for (var _i = 0, _a = project.fileNames; _i < _a.length; _i++) {
+                var inputFile = _a[_i];
+                if (!compilerHost.fileExists(inputFile)) {
+                    return {
+                        type: UpToDateStatusType.Unbuildable,
+                        reason: inputFile + " does not exist"
+                    };
+                }
+                var inputTime = compilerHost.getModifiedTime(inputFile);
+                if (inputTime > newestInputFileTime) {
+                    newestInputFileName = inputFile;
+                    newestInputFileTime = inputTime;
+                }
+            }
+            // Collect the expected outputs of this project
+            var outputs = getAllProjectOutputs(project);
+            if (outputs.length === 0) {
+                return {
+                    type: UpToDateStatusType.ContainerOnly
+                };
+            }
+            // Now see if all outputs are newer than the newest input
+            var oldestOutputFileName = "(none)";
+            var oldestOutputFileTime = maximumDate;
+            var newestOutputFileName = "(none)";
+            var newestOutputFileTime = minimumDate;
+            var missingOutputFileName;
+            var newestDeclarationFileContentChangedTime = minimumDate;
+            var isOutOfDateWithInputs = false;
+            for (var _b = 0, outputs_1 = outputs; _b < outputs_1.length; _b++) {
+                var output = outputs_1[_b];
+                // Output is missing; can stop checking
+                // Don't immediately return because we can still be upstream-blocked, which is a higher-priority status
+                if (!compilerHost.fileExists(output)) {
+                    missingOutputFileName = output;
+                    break;
+                }
+                var outputTime = compilerHost.getModifiedTime(output);
+                if (outputTime < oldestOutputFileTime) {
+                    oldestOutputFileTime = outputTime;
+                    oldestOutputFileName = output;
+                }
+                // If an output is older than the newest input, we can stop checking
+                // Don't immediately return because we can still be upstream-blocked, which is a higher-priority status
+                if (outputTime < newestInputFileTime) {
+                    isOutOfDateWithInputs = true;
+                    break;
+                }
+                if (outputTime > newestOutputFileTime) {
+                    newestOutputFileTime = outputTime;
+                    newestOutputFileName = output;
+                }
+                // Keep track of when the most recent time a .d.ts file was changed.
+                // In addition to file timestamps, we also keep track of when a .d.ts file
+                // had its file touched but not had its contents changed - this allows us
+                // to skip a downstream typecheck
+                if (isDeclarationFile(output)) {
+                    var unchangedTime = context.unchangedOutputs.getValueOrUndefined(output);
+                    if (unchangedTime !== undefined) {
+                        newestDeclarationFileContentChangedTime = newer(unchangedTime, newestDeclarationFileContentChangedTime);
+                    }
+                    else {
+                        newestDeclarationFileContentChangedTime = newer(newestDeclarationFileContentChangedTime, compilerHost.getModifiedTime(output));
+                    }
+                }
+            }
+            var pseudoUpToDate = false;
+            if (project.projectReferences) {
+                for (var _c = 0, _d = project.projectReferences; _c < _d.length; _c++) {
+                    var ref = _d[_c];
+                    var resolvedRef = ts.resolveProjectReferencePath(compilerHost, ref);
+                    var refStatus = getUpToDateStatus(configFileCache.parseConfigFile(resolvedRef));
+                    // An upstream project is blocked
+                    if (refStatus.type === UpToDateStatusType.Unbuildable) {
+                        return {
+                            type: UpToDateStatusType.UpstreamBlocked,
+                            upstreamProjectName: ref.path
+                        };
+                    }
+                    // If the upstream project is out of date, then so are we (someone shouldn't have asked, though?)
+                    if (refStatus.type !== UpToDateStatusType.UpToDate) {
+                        return {
+                            type: UpToDateStatusType.UpstreamOutOfDate,
+                            upstreamProjectName: ref.path
+                        };
+                    }
+                    // If the upstream project's newest file is older than our oldest output, we
+                    // can't be out of date because of it
+                    if (refStatus.newestInputFileTime <= oldestOutputFileTime) {
+                        continue;
+                    }
+                    // If the upstream project has only change .d.ts files, and we've built
+                    // *after* those files, then we're "psuedo up to date" and eligible for a fast rebuild
+                    if (refStatus.newestDeclarationFileContentChangedTime <= oldestOutputFileTime) {
+                        pseudoUpToDate = true;
+                        continue;
+                    }
+                    // We have an output older than an upstream output - we are out of date
+                    ts.Debug.assert(oldestOutputFileName !== undefined, "Should have an oldest output filename here");
+                    return {
+                        type: UpToDateStatusType.OutOfDateWithUpstream,
+                        outOfDateOutputFileName: oldestOutputFileName,
+                        newerProjectName: ref.path
+                    };
+                }
+            }
+            if (missingOutputFileName !== undefined) {
+                return {
+                    type: UpToDateStatusType.OutputMissing,
+                    missingOutputFileName: missingOutputFileName
+                };
+            }
+            if (isOutOfDateWithInputs) {
+                return {
+                    type: UpToDateStatusType.OutOfDateWithSelf,
+                    outOfDateOutputFileName: oldestOutputFileName,
+                    newerInputFileName: newestInputFileName
+                };
+            }
+            // Up to date
+            return {
+                type: pseudoUpToDate ? UpToDateStatusType.UpToDateWithUpstreamTypes : UpToDateStatusType.UpToDate,
+                newestDeclarationFileContentChangedTime: newestDeclarationFileContentChangedTime,
+                newestInputFileTime: newestInputFileTime,
+                newestOutputFileTime: newestOutputFileTime,
+                newestInputFileName: newestInputFileName,
+                newestOutputFileName: newestOutputFileName,
+                oldestOutputFileName: oldestOutputFileName
+            };
         }
-        var extendedConfigPath = ts.getNormalizedAbsolutePath(extendedConfig, basePath);
-        if (!host.fileExists(extendedConfigPath) && !ts.endsWith(extendedConfigPath, ".json")) {
-            extendedConfigPath = extendedConfigPath + ".json";
-            if (!host.fileExists(extendedConfigPath)) {
-                errors.push(createDiagnostic(ts.Diagnostics.File_0_does_not_exist, extendedConfig));
+        function createDependencyGraph(roots) {
+            var temporaryMarks = {};
+            var permanentMarks = {};
+            var circularityReportStack = [];
+            var buildOrder = [];
+            var graph = createDependencyMapper();
+            var hadError = false;
+            for (var _i = 0, roots_1 = roots; _i < roots_1.length; _i++) {
+                var root = roots_1[_i];
+                visit(root);
+            }
+            if (hadError) {
                 return undefined;
             }
-        }
-        return extendedConfigPath;
-    }
-    function getExtendedConfig(sourceFile, extendedConfigPath, host, basePath, resolutionStack, errors) {
-        var _a;
-        var extendedResult = readJsonConfigFile(extendedConfigPath, function (path) { return host.readFile(path); });
-        if (sourceFile) {
-            (sourceFile.extendedSourceFiles || (sourceFile.extendedSourceFiles = [])).push(extendedResult.fileName);
-        }
-        if (extendedResult.parseDiagnostics.length) {
-            errors.push.apply(errors, extendedResult.parseDiagnostics);
-            return undefined;
-        }
-        var extendedDirname = ts.getDirectoryPath(extendedConfigPath);
-        var extendedConfig = parseConfig(undefined, extendedResult, host, extendedDirname, ts.getBaseFileName(extendedConfigPath), resolutionStack, errors);
-        if (sourceFile) {
-            (_a = sourceFile.extendedSourceFiles).push.apply(_a, extendedResult.extendedSourceFiles);
-        }
-        if (isSuccessfulParsedTsconfig(extendedConfig)) {
-            var relativeDifference_1 = ts.convertToRelativePath(extendedDirname, basePath, ts.identity);
-            var updatePath_1 = function (path) { return ts.isRootedDiskPath(path) ? path : ts.combinePaths(relativeDifference_1, path); };
-            var mapPropertiesInRawIfNotUndefined = function (propertyName) {
-                if (raw_2[propertyName]) {
-                    raw_2[propertyName] = ts.map(raw_2[propertyName], updatePath_1);
-                }
-            };
-            var raw_2 = extendedConfig.raw;
-            mapPropertiesInRawIfNotUndefined("include");
-            mapPropertiesInRawIfNotUndefined("exclude");
-            mapPropertiesInRawIfNotUndefined("files");
-        }
-        return extendedConfig;
-    }
-    function convertCompileOnSaveOptionFromJson(jsonOption, basePath, errors) {
-        if (!ts.hasProperty(jsonOption, ts.compileOnSaveCommandLineOption.name)) {
-            return false;
-        }
-        var result = convertJsonOption(ts.compileOnSaveCommandLineOption, jsonOption.compileOnSave, basePath, errors);
-        return typeof result === "boolean" && result;
-    }
-    function convertCompilerOptionsFromJson(jsonOptions, basePath, configFileName) {
-        var errors = [];
-        var options = convertCompilerOptionsFromJsonWorker(jsonOptions, basePath, errors, configFileName);
-        return { options: options, errors: errors };
-    }
-    ts.convertCompilerOptionsFromJson = convertCompilerOptionsFromJson;
-    function convertTypeAcquisitionFromJson(jsonOptions, basePath, configFileName) {
-        var errors = [];
-        var options = convertTypeAcquisitionFromJsonWorker(jsonOptions, basePath, errors, configFileName);
-        return { options: options, errors: errors };
-    }
-    ts.convertTypeAcquisitionFromJson = convertTypeAcquisitionFromJson;
-    function getDefaultCompilerOptions(configFileName) {
-        var options = configFileName && ts.getBaseFileName(configFileName) === "jsconfig.json"
-            ? { allowJs: true, maxNodeModuleJsDepth: 2, allowSyntheticDefaultImports: true, skipLibCheck: true, noEmit: true }
-            : {};
-        return options;
-    }
-    function convertCompilerOptionsFromJsonWorker(jsonOptions, basePath, errors, configFileName) {
-        var options = getDefaultCompilerOptions(configFileName);
-        convertOptionsFromJson(ts.optionDeclarations, jsonOptions, basePath, options, ts.Diagnostics.Unknown_compiler_option_0, errors);
-        if (configFileName) {
-            options.configFilePath = ts.normalizeSlashes(configFileName);
-        }
-        return options;
-    }
-    function getDefaultTypeAcquisition(configFileName) {
-        return { enable: !!configFileName && ts.getBaseFileName(configFileName) === "jsconfig.json", include: [], exclude: [] };
-    }
-    function convertTypeAcquisitionFromJsonWorker(jsonOptions, basePath, errors, configFileName) {
-        var options = getDefaultTypeAcquisition(configFileName);
-        var typeAcquisition = convertEnableAutoDiscoveryToEnable(jsonOptions);
-        convertOptionsFromJson(ts.typeAcquisitionDeclarations, typeAcquisition, basePath, options, ts.Diagnostics.Unknown_type_acquisition_option_0, errors);
-        return options;
-    }
-    function convertOptionsFromJson(optionDeclarations, jsonOptions, basePath, defaultOptions, diagnosticMessage, errors) {
-        if (!jsonOptions) {
-            return;
-        }
-        var optionNameMap = commandLineOptionsToMap(optionDeclarations);
-        for (var id in jsonOptions) {
-            var opt = optionNameMap.get(id);
-            if (opt) {
-                defaultOptions[opt.name] = convertJsonOption(opt, jsonOptions[id], basePath, errors);
-            }
-            else {
-                errors.push(ts.createCompilerDiagnostic(diagnosticMessage, id));
-            }
-        }
-    }
-    function convertJsonOption(opt, value, basePath, errors) {
-        if (isCompilerOptionsValue(opt, value)) {
-            var optType = opt.type;
-            if (optType === "list" && ts.isArray(value)) {
-                return convertJsonOptionOfListType(opt, value, basePath, errors);
-            }
-            else if (!ts.isString(optType)) {
-                return convertJsonOptionOfCustomType(opt, value, errors);
-            }
-            return normalizeNonListOptionValue(opt, basePath, value);
-        }
-        else {
-            errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, opt.name, getCompilerOptionValueTypeString(opt)));
-        }
-    }
-    function normalizeOptionValue(option, basePath, value) {
-        if (isNullOrUndefined(value))
-            return undefined;
-        if (option.type === "list") {
-            var listOption_1 = option;
-            if (listOption_1.element.isFilePath || !ts.isString(listOption_1.element.type)) {
-                return ts.filter(ts.map(value, function (v) { return normalizeOptionValue(listOption_1.element, basePath, v); }), function (v) { return !!v; });
-            }
-            return value;
-        }
-        else if (!ts.isString(option.type)) {
-            return option.type.get(ts.isString(value) ? value.toLowerCase() : value);
-        }
-        return normalizeNonListOptionValue(option, basePath, value);
-    }
-    function normalizeNonListOptionValue(option, basePath, value) {
-        if (option.isFilePath) {
-            value = ts.normalizePath(ts.combinePaths(basePath, value));
-            if (value === "") {
-                value = ".";
-            }
-        }
-        return value;
-    }
-    function convertJsonOptionOfCustomType(opt, value, errors) {
-        if (isNullOrUndefined(value))
-            return undefined;
-        var key = value.toLowerCase();
-        var val = opt.type.get(key);
-        if (val !== undefined) {
-            return val;
-        }
-        else {
-            errors.push(createCompilerDiagnosticForInvalidCustomType(opt));
-        }
-    }
-    function convertJsonOptionOfListType(option, values, basePath, errors) {
-        return ts.filter(ts.map(values, function (v) { return convertJsonOption(option.element, v, basePath, errors); }), function (v) { return !!v; });
-    }
-    function trimString(s) {
-        return typeof s.trim === "function" ? s.trim() : s.replace(/^[\s]+|[\s]+$/g, "");
-    }
-    var invalidTrailingRecursionPattern = /(^|\/)\*\*\/?$/;
-    var invalidDotDotAfterRecursiveWildcardPattern = /(^|\/)\*\*\/(.*\/)?\.\.($|\/)/;
-    var watchRecursivePattern = /\/[^/]*?[*?][^/]*\//;
-    var wildcardDirectoryPattern = /^[^*?]*(?=\/[^/]*[*?])/;
-    function matchFileNames(filesSpecs, includeSpecs, excludeSpecs, basePath, options, host, errors, extraFileExtensions, jsonSourceFile) {
-        basePath = ts.normalizePath(basePath);
-        var validatedIncludeSpecs, validatedExcludeSpecs;
-        if (includeSpecs) {
-            validatedIncludeSpecs = validateSpecs(includeSpecs, errors, false, jsonSourceFile, "include");
-        }
-        if (excludeSpecs) {
-            validatedExcludeSpecs = validateSpecs(excludeSpecs, errors, true, jsonSourceFile, "exclude");
-        }
-        var wildcardDirectories = getWildcardDirectories(validatedIncludeSpecs, validatedExcludeSpecs, basePath, host.useCaseSensitiveFileNames);
-        var spec = { filesSpecs: filesSpecs, referencesSpecs: undefined, includeSpecs: includeSpecs, excludeSpecs: excludeSpecs, validatedIncludeSpecs: validatedIncludeSpecs, validatedExcludeSpecs: validatedExcludeSpecs, wildcardDirectories: wildcardDirectories };
-        return getFileNamesFromConfigSpecs(spec, basePath, options, host, extraFileExtensions);
-    }
-    function getFileNamesFromConfigSpecs(spec, basePath, options, host, extraFileExtensions) {
-        if (extraFileExtensions === void 0) { extraFileExtensions = []; }
-        basePath = ts.normalizePath(basePath);
-        var keyMapper = host.useCaseSensitiveFileNames ? ts.identity : ts.toLowerCase;
-        var literalFileMap = ts.createMap();
-        var wildcardFileMap = ts.createMap();
-        var filesSpecs = spec.filesSpecs, validatedIncludeSpecs = spec.validatedIncludeSpecs, validatedExcludeSpecs = spec.validatedExcludeSpecs, wildcardDirectories = spec.wildcardDirectories;
-        var supportedExtensions = ts.getSupportedExtensions(options, extraFileExtensions);
-        if (filesSpecs) {
-            for (var _i = 0, filesSpecs_1 = filesSpecs; _i < filesSpecs_1.length; _i++) {
-                var fileName = filesSpecs_1[_i];
-                var file_13 = ts.getNormalizedAbsolutePath(fileName, basePath);
-                literalFileMap.set(keyMapper(file_13), file_13);
-            }
-        }
-        if (validatedIncludeSpecs && validatedIncludeSpecs.length > 0) {
-            for (var _a = 0, _b = host.readDirectory(basePath, supportedExtensions, validatedExcludeSpecs, validatedIncludeSpecs, undefined); _a < _b.length; _a++) {
-                var file_14 = _b[_a];
-                if (hasFileWithHigherPriorityExtension(file_14, literalFileMap, wildcardFileMap, supportedExtensions, keyMapper)) {
-                    continue;
-                }
-                removeWildcardFilesWithLowerPriorityExtension(file_14, wildcardFileMap, supportedExtensions, keyMapper);
-                var key = keyMapper(file_14);
-                if (!literalFileMap.has(key) && !wildcardFileMap.has(key)) {
-                    wildcardFileMap.set(key, file_14);
-                }
-            }
-        }
-        var literalFiles = ts.arrayFrom(literalFileMap.values());
-        var wildcardFiles = ts.arrayFrom(wildcardFileMap.values());
-        var projectReferences = spec.referencesSpecs && spec.referencesSpecs.map(function (r) {
-            return __assign({}, r, { path: ts.getNormalizedAbsolutePath(r.path, basePath) });
-        });
-        return {
-            fileNames: literalFiles.concat(wildcardFiles),
-            projectReferences: projectReferences,
-            wildcardDirectories: wildcardDirectories,
-            spec: spec
-        };
-    }
-    ts.getFileNamesFromConfigSpecs = getFileNamesFromConfigSpecs;
-    function validateSpecs(specs, errors, allowTrailingRecursion, jsonSourceFile, specKey) {
-        return specs.filter(function (spec) {
-            var diag = specToDiagnostic(spec, allowTrailingRecursion);
-            if (diag !== undefined) {
-                errors.push(createDiagnostic(diag, spec));
-            }
-            return diag === undefined;
-        });
-        function createDiagnostic(message, spec) {
-            var element = ts.getTsConfigPropArrayElementValue(jsonSourceFile, specKey, spec);
-            return element ?
-                ts.createDiagnosticForNodeInSourceFile(jsonSourceFile, element, message, spec) :
-                ts.createCompilerDiagnostic(message, spec);
-        }
-    }
-    function specToDiagnostic(spec, allowTrailingRecursion) {
-        if (!allowTrailingRecursion && invalidTrailingRecursionPattern.test(spec)) {
-            return ts.Diagnostics.File_specification_cannot_end_in_a_recursive_directory_wildcard_Asterisk_Asterisk_Colon_0;
-        }
-        else if (invalidDotDotAfterRecursiveWildcardPattern.test(spec)) {
-            return ts.Diagnostics.File_specification_cannot_contain_a_parent_directory_that_appears_after_a_recursive_directory_wildcard_Asterisk_Asterisk_Colon_0;
-        }
-    }
-    function getWildcardDirectories(include, exclude, path, useCaseSensitiveFileNames) {
-        var rawExcludeRegex = ts.getRegularExpressionForWildcard(exclude, path, "exclude");
-        var excludeRegex = rawExcludeRegex && new RegExp(rawExcludeRegex, useCaseSensitiveFileNames ? "" : "i");
-        var wildcardDirectories = {};
-        if (include !== undefined) {
-            var recursiveKeys = [];
-            for (var _i = 0, include_1 = include; _i < include_1.length; _i++) {
-                var file_15 = include_1[_i];
-                var spec = ts.normalizePath(ts.combinePaths(path, file_15));
-                if (excludeRegex && excludeRegex.test(spec)) {
-                    continue;
-                }
-                var match = getWildcardDirectoryFromSpec(spec, useCaseSensitiveFileNames);
-                if (match) {
-                    var key = match.key, flags = match.flags;
-                    var existingFlags = wildcardDirectories[key];
-                    if (existingFlags === undefined || existingFlags < flags) {
-                        wildcardDirectories[key] = flags;
-                        if (flags === 1) {
-                            recursiveKeys.push(key);
-                        }
-                    }
-                }
-            }
-            for (var key in wildcardDirectories) {
-                if (ts.hasProperty(wildcardDirectories, key)) {
-                    for (var _a = 0, recursiveKeys_1 = recursiveKeys; _a < recursiveKeys_1.length; _a++) {
-                        var recursiveKey = recursiveKeys_1[_a];
-                        if (key !== recursiveKey && ts.containsPath(recursiveKey, key, path, !useCaseSensitiveFileNames)) {
-                            delete wildcardDirectories[key];
-                        }
-                    }
-                }
-            }
-        }
-        return wildcardDirectories;
-    }
-    function getWildcardDirectoryFromSpec(spec, useCaseSensitiveFileNames) {
-        var match = wildcardDirectoryPattern.exec(spec);
-        if (match) {
             return {
-                key: useCaseSensitiveFileNames ? match[0] : match[0].toLowerCase(),
-                flags: watchRecursivePattern.test(spec) ? 1 : 0
+                buildQueue: buildOrder,
+                dependencyMap: graph
             };
-        }
-        if (ts.isImplicitGlob(spec)) {
-            return { key: spec, flags: 1 };
-        }
-        return undefined;
-    }
-    function hasFileWithHigherPriorityExtension(file, literalFiles, wildcardFiles, extensions, keyMapper) {
-        var extensionPriority = ts.getExtensionPriority(file, extensions);
-        var adjustedExtensionPriority = ts.adjustExtensionPriority(extensionPriority, extensions);
-        for (var i = 0; i < adjustedExtensionPriority; i++) {
-            var higherPriorityExtension = extensions[i];
-            var higherPriorityPath = keyMapper(ts.changeExtension(file, higherPriorityExtension));
-            if (literalFiles.has(higherPriorityPath) || wildcardFiles.has(higherPriorityPath)) {
-                return true;
+            function visit(projPath, inCircularContext) {
+                if (inCircularContext === void 0) { inCircularContext = false; }
+                // Already visited
+                if (permanentMarks[projPath])
+                    return;
+                // Circular
+                if (temporaryMarks[projPath]) {
+                    if (!inCircularContext) {
+                        hadError = true;
+                        buildHost.error(ts.Diagnostics.Project_references_may_not_form_a_circular_graph_Cycle_detected_Colon_0, circularityReportStack.join("\r\n"));
+                        return;
+                    }
+                }
+                temporaryMarks[projPath] = true;
+                circularityReportStack.push(projPath);
+                var parsed = configFileCache.parseConfigFile(projPath);
+                if (parsed === undefined) {
+                    hadError = true;
+                    return;
+                }
+                if (parsed.projectReferences) {
+                    for (var _i = 0, _a = parsed.projectReferences; _i < _a.length; _i++) {
+                        var ref = _a[_i];
+                        var resolvedRefPath = resolveProjectName(ref.path);
+                        if (resolvedRefPath === undefined) {
+                            hadError = true;
+                            break;
+                        }
+                        visit(resolvedRefPath, inCircularContext || ref.circular);
+                        graph.addReference(projPath, resolvedRefPath);
+                    }
+                }
+                circularityReportStack.pop();
+                permanentMarks[projPath] = true;
+                buildOrder.push(projPath);
             }
         }
-        return false;
-    }
-    function removeWildcardFilesWithLowerPriorityExtension(file, wildcardFiles, extensions, keyMapper) {
-        var extensionPriority = ts.getExtensionPriority(file, extensions);
-        var nextExtensionPriority = ts.getNextLowestExtensionPriority(extensionPriority, extensions);
-        for (var i = nextExtensionPriority; i < extensions.length; i++) {
-            var lowerPriorityExtension = extensions[i];
-            var lowerPriorityPath = keyMapper(ts.changeExtension(file, lowerPriorityExtension));
-            wildcardFiles.delete(lowerPriorityPath);
-        }
-    }
-    function convertCompilerOptionsForTelemetry(opts) {
-        var out = {};
-        for (var key in opts) {
-            if (opts.hasOwnProperty(key)) {
-                var type = getOptionFromName(key);
-                if (type !== undefined) {
-                    out[key] = getOptionValueWithEmptyStrings(opts[key], type);
+        function buildSingleProject(proj) {
+            if (context.options.dry) {
+                buildHost.message(ts.Diagnostics.A_non_dry_build_would_build_project_0, proj);
+                return BuildResultFlags.Success;
+            }
+            if (context.options.verbose)
+                buildHost.verbose(ts.Diagnostics.Building_project_0, proj);
+            var resultFlags = BuildResultFlags.None;
+            resultFlags |= BuildResultFlags.DeclarationOutputUnchanged;
+            var configFile = configFileCache.parseConfigFile(proj);
+            if (!configFile) {
+                // Failed to read the config file
+                resultFlags |= BuildResultFlags.ConfigFileErrors;
+                context.projectStatus.setValue(proj, { type: UpToDateStatusType.Unbuildable, reason: "Config file errors" });
+                return resultFlags;
+            }
+            if (configFile.fileNames.length === 0) {
+                // Nothing to build - must be a solution file, basically
+                return BuildResultFlags.None;
+            }
+            var programOptions = {
+                projectReferences: configFile.projectReferences,
+                host: compilerHost,
+                rootNames: configFile.fileNames,
+                options: configFile.options
+            };
+            var program = ts.createProgram(programOptions);
+            // Don't emit anything in the presence of syntactic errors or options diagnostics
+            var syntaxDiagnostics = program.getOptionsDiagnostics().concat(program.getSyntacticDiagnostics());
+            if (syntaxDiagnostics.length) {
+                resultFlags |= BuildResultFlags.SyntaxErrors;
+                for (var _i = 0, syntaxDiagnostics_1 = syntaxDiagnostics; _i < syntaxDiagnostics_1.length; _i++) {
+                    var diag = syntaxDiagnostics_1[_i];
+                    buildHost.errorDiagnostic(diag);
+                }
+                context.projectStatus.setValue(proj, { type: UpToDateStatusType.Unbuildable, reason: "Syntactic errors" });
+                return resultFlags;
+            }
+            // Don't emit .d.ts if there are decl file errors
+            if (program.getCompilerOptions().declaration) {
+                var declDiagnostics = program.getDeclarationDiagnostics();
+                if (declDiagnostics.length) {
+                    resultFlags |= BuildResultFlags.DeclarationEmitErrors;
+                    for (var _a = 0, declDiagnostics_1 = declDiagnostics; _a < declDiagnostics_1.length; _a++) {
+                        var diag = declDiagnostics_1[_a];
+                        buildHost.errorDiagnostic(diag);
+                    }
+                    context.projectStatus.setValue(proj, { type: UpToDateStatusType.Unbuildable, reason: "Declaration file errors" });
+                    return resultFlags;
                 }
             }
-        }
-        return out;
-    }
-    ts.convertCompilerOptionsForTelemetry = convertCompilerOptionsForTelemetry;
-    function getOptionValueWithEmptyStrings(value, option) {
-        switch (option.type) {
-            case "object":
-                return "";
-            case "string":
-                return "";
-            case "number":
-                return typeof value === "number" ? value : "";
-            case "boolean":
-                return typeof value === "boolean" ? value : "";
-            case "list":
-                var elementType_1 = option.element;
-                return ts.isArray(value) ? value.map(function (v) { return getOptionValueWithEmptyStrings(v, elementType_1); }) : "";
-            default:
-                return ts.forEachEntry(option.type, function (optionEnumValue, optionStringValue) {
-                    if (optionEnumValue === value) {
-                        return optionStringValue;
+            // Same as above but now for semantic diagnostics
+            var semanticDiagnostics = program.getSemanticDiagnostics();
+            if (semanticDiagnostics.length) {
+                resultFlags |= BuildResultFlags.TypeErrors;
+                for (var _b = 0, semanticDiagnostics_1 = semanticDiagnostics; _b < semanticDiagnostics_1.length; _b++) {
+                    var diag = semanticDiagnostics_1[_b];
+                    buildHost.errorDiagnostic(diag);
+                }
+                context.projectStatus.setValue(proj, { type: UpToDateStatusType.Unbuildable, reason: "Semantic errors" });
+                return resultFlags;
+            }
+            var newestDeclarationFileContentChangedTime = minimumDate;
+            program.emit(/*targetSourceFile*/ undefined, function (fileName, content, writeBom, onError) {
+                var priorChangeTime;
+                if (isDeclarationFile(fileName) && compilerHost.fileExists(fileName)) {
+                    if (compilerHost.readFile(fileName) === content) {
+                        // Check for unchanged .d.ts files
+                        resultFlags &= ~BuildResultFlags.DeclarationOutputUnchanged;
+                        priorChangeTime = compilerHost.getModifiedTime && compilerHost.getModifiedTime(fileName);
                     }
-                });
+                }
+                compilerHost.writeFile(fileName, content, writeBom, onError, ts.emptyArray);
+                if (priorChangeTime !== undefined) {
+                    newestDeclarationFileContentChangedTime = newer(priorChangeTime, newestDeclarationFileContentChangedTime);
+                    context.unchangedOutputs.setValue(fileName, priorChangeTime);
+                }
+            });
+            context.projectStatus.setValue(proj, { type: UpToDateStatusType.UpToDate, newestDeclarationFileContentChangedTime: newestDeclarationFileContentChangedTime });
+            return resultFlags;
+        }
+        function updateOutputTimestamps(proj) {
+            if (context.options.dry) {
+                return buildHost.message(ts.Diagnostics.A_non_dry_build_would_build_project_0, proj.options.configFilePath);
+            }
+            if (context.options.verbose)
+                buildHost.verbose(ts.Diagnostics.Updating_output_timestamps_of_project_0, proj.options.configFilePath);
+            var now = new Date();
+            var outputs = getAllProjectOutputs(proj);
+            var priorNewestUpdateTime = minimumDate;
+            for (var _i = 0, outputs_2 = outputs; _i < outputs_2.length; _i++) {
+                var file = outputs_2[_i];
+                if (isDeclarationFile(file)) {
+                    priorNewestUpdateTime = newer(priorNewestUpdateTime, compilerHost.getModifiedTime(file));
+                }
+                compilerHost.setModifiedTime(file, now);
+            }
+            context.projectStatus.setValue(proj.options.configFilePath, { type: UpToDateStatusType.UpToDate, newestDeclarationFileContentChangedTime: priorNewestUpdateTime });
+        }
+        function getFilesToClean(configFileNames) {
+            var resolvedNames = resolveProjectNames(configFileNames);
+            if (resolvedNames === undefined)
+                return undefined;
+            // Get the same graph for cleaning we'd use for building
+            var graph = createDependencyGraph(resolvedNames);
+            if (graph === undefined)
+                return undefined;
+            var filesToDelete = [];
+            for (var _i = 0, _a = graph.buildQueue; _i < _a.length; _i++) {
+                var proj = _a[_i];
+                var parsed = configFileCache.parseConfigFile(proj);
+                if (parsed === undefined) {
+                    // File has gone missing; fine to ignore here
+                    continue;
+                }
+                var outputs = getAllProjectOutputs(parsed);
+                for (var _b = 0, outputs_3 = outputs; _b < outputs_3.length; _b++) {
+                    var output = outputs_3[_b];
+                    if (compilerHost.fileExists(output)) {
+                        filesToDelete.push(output);
+                    }
+                }
+            }
+            return filesToDelete;
+        }
+        function getAllProjectsInScope() {
+            var resolvedNames = resolveProjectNames(rootNames);
+            if (resolvedNames === undefined)
+                return undefined;
+            var graph = createDependencyGraph(resolvedNames);
+            if (graph === undefined)
+                return undefined;
+            return graph.buildQueue;
+        }
+        function cleanAllProjects() {
+            var resolvedNames = getAllProjectsInScope();
+            if (resolvedNames === undefined) {
+                return buildHost.message(ts.Diagnostics.Skipping_clean_because_not_all_projects_could_be_located);
+            }
+            var filesToDelete = getFilesToClean(resolvedNames);
+            if (filesToDelete === undefined) {
+                return buildHost.message(ts.Diagnostics.Skipping_clean_because_not_all_projects_could_be_located);
+            }
+            if (context.options.dry) {
+                return buildHost.message(ts.Diagnostics.A_non_dry_build_would_delete_the_following_files_Colon_0, filesToDelete.map(function (f) { return "\r\n * " + f; }).join(""));
+            }
+            // Do this check later to allow --clean --dry to function even if the host can't delete files
+            if (!compilerHost.deleteFile) {
+                throw new Error("Host does not support deleting files");
+            }
+            for (var _i = 0, filesToDelete_1 = filesToDelete; _i < filesToDelete_1.length; _i++) {
+                var output = filesToDelete_1[_i];
+                compilerHost.deleteFile(output);
+            }
+        }
+        function resolveProjectName(name) {
+            var fullPath = ts.resolvePath(compilerHost.getCurrentDirectory(), name);
+            if (compilerHost.fileExists(fullPath)) {
+                return fullPath;
+            }
+            var fullPathWithTsconfig = ts.combinePaths(fullPath, "tsconfig.json");
+            if (compilerHost.fileExists(fullPathWithTsconfig)) {
+                return fullPathWithTsconfig;
+            }
+            buildHost.error(ts.Diagnostics.File_0_not_found, relName(fullPath));
+            return undefined;
+        }
+        function resolveProjectNames(configFileNames) {
+            var resolvedNames = [];
+            for (var _i = 0, configFileNames_1 = configFileNames; _i < configFileNames_1.length; _i++) {
+                var name = configFileNames_1[_i];
+                var resolved = resolveProjectName(name);
+                if (resolved === undefined) {
+                    return undefined;
+                }
+                resolvedNames.push(resolved);
+            }
+            return resolvedNames;
+        }
+        function buildAllProjects() {
+            var graph = getGlobalDependencyGraph();
+            if (graph === undefined)
+                return;
+            var queue = graph.buildQueue;
+            reportBuildQueue(graph);
+            for (var _i = 0, queue_1 = queue; _i < queue_1.length; _i++) {
+                var next = queue_1[_i];
+                var proj = configFileCache.parseConfigFile(next);
+                if (proj === undefined) {
+                    break;
+                }
+                var status = getUpToDateStatus(proj);
+                verboseReportProjectStatus(next, status);
+                var projName = proj.options.configFilePath;
+                if (status.type === UpToDateStatusType.UpToDate && !context.options.force) {
+                    // Up to date, skip
+                    if (defaultOptions.dry) {
+                        // In a dry build, inform the user of this fact
+                        buildHost.message(ts.Diagnostics.Project_0_is_up_to_date, projName);
+                    }
+                    continue;
+                }
+                if (status.type === UpToDateStatusType.UpToDateWithUpstreamTypes && !context.options.force) {
+                    // Fake build
+                    updateOutputTimestamps(proj);
+                    continue;
+                }
+                if (status.type === UpToDateStatusType.UpstreamBlocked) {
+                    if (context.options.verbose)
+                        buildHost.verbose(ts.Diagnostics.Skipping_build_of_project_0_because_its_dependency_1_has_errors, projName, status.upstreamProjectName);
+                    continue;
+                }
+                if (status.type === UpToDateStatusType.ContainerOnly) {
+                    // Do nothing
+                    continue;
+                }
+                buildSingleProject(next);
+            }
+        }
+        /**
+         * Report the build ordering inferred from the current project graph if we're in verbose mode
+         */
+        function reportBuildQueue(graph) {
+            if (!context.options.verbose)
+                return;
+            var names = [];
+            for (var _i = 0, _a = graph.buildQueue; _i < _a.length; _i++) {
+                var name = _a[_i];
+                names.push(name);
+            }
+            if (context.options.verbose)
+                buildHost.verbose(ts.Diagnostics.Projects_in_this_build_Colon_0, names.map(function (s) { return "\r\n    * " + relName(s); }).join(""));
+        }
+        function relName(path) {
+            return ts.convertToRelativePath(path, compilerHost.getCurrentDirectory(), function (f) { return compilerHost.getCanonicalFileName(f); });
+        }
+        /**
+         * Report the up-to-date status of a project if we're in verbose mode
+         */
+        function verboseReportProjectStatus(configFileName, status) {
+            if (!context.options.verbose)
+                return;
+            switch (status.type) {
+                case UpToDateStatusType.OutOfDateWithSelf:
+                    return buildHost.verbose(ts.Diagnostics.Project_0_is_out_of_date_because_oldest_output_1_is_older_than_newest_input_2, relName(configFileName), relName(status.outOfDateOutputFileName), relName(status.newerInputFileName));
+                case UpToDateStatusType.OutOfDateWithUpstream:
+                    return buildHost.verbose(ts.Diagnostics.Project_0_is_out_of_date_because_oldest_output_1_is_older_than_newest_input_2, relName(configFileName), relName(status.outOfDateOutputFileName), relName(status.newerProjectName));
+                case UpToDateStatusType.OutputMissing:
+                    return buildHost.verbose(ts.Diagnostics.Project_0_is_out_of_date_because_output_file_1_does_not_exist, relName(configFileName), relName(status.missingOutputFileName));
+                case UpToDateStatusType.UpToDate:
+                    if (status.newestInputFileTime !== undefined) {
+                        return buildHost.verbose(ts.Diagnostics.Project_0_is_up_to_date_because_newest_input_1_is_older_than_oldest_output_2, relName(configFileName), relName(status.newestInputFileName), relName(status.oldestOutputFileName));
+                    }
+                    // Don't report anything for "up to date because it was already built" -- too verbose
+                    break;
+                case UpToDateStatusType.UpToDateWithUpstreamTypes:
+                    return buildHost.verbose(ts.Diagnostics.Project_0_is_up_to_date_with_d_ts_files_from_its_dependencies, relName(configFileName));
+                case UpToDateStatusType.UpstreamOutOfDate:
+                    return buildHost.verbose(ts.Diagnostics.Project_0_is_out_of_date_because_its_dependency_1_is_out_of_date, relName(configFileName), relName(status.upstreamProjectName));
+                case UpToDateStatusType.UpstreamBlocked:
+                    return buildHost.verbose(ts.Diagnostics.Project_0_can_t_be_built_because_its_dependency_1_has_errors, relName(configFileName), relName(status.upstreamProjectName));
+                case UpToDateStatusType.Unbuildable:
+                    return buildHost.verbose(ts.Diagnostics.Failed_to_parse_file_0_Colon_1, relName(configFileName), status.reason);
+                case UpToDateStatusType.ContainerOnly:
+                    // Don't report status on "solution" projects
+                    break;
+                default:
+                    ts.assertTypeIsNever(status);
+            }
         }
     }
+    ts.createSolutionBuilder = createSolutionBuilder;
 })(ts || (ts = {}));
+//# sourceMappingURL=compiler.js.map
 var ts;
 (function (ts) {
     function countLines(program) {
@@ -68654,18 +86223,10 @@ var ts;
         });
         return count;
     }
-    function getDiagnosticText(_message) {
-        var _args = [];
-        for (var _i = 1; _i < arguments.length; _i++) {
-            _args[_i - 1] = arguments[_i];
-        }
-        var diagnostic = ts.createCompilerDiagnostic.apply(undefined, arguments);
-        return diagnostic.messageText;
-    }
     var reportDiagnostic = ts.createDiagnosticReporter(ts.sys);
     function updateReportDiagnostic(options) {
         if (shouldBePretty(options)) {
-            reportDiagnostic = ts.createDiagnosticReporter(ts.sys, true);
+            reportDiagnostic = ts.createDiagnosticReporter(ts.sys, /*pretty*/ true);
         }
     }
     function shouldBePretty(options) {
@@ -68686,12 +86247,42 @@ var ts;
         }
         return s;
     }
+    function getOptionsForHelp(commandLine) {
+        // Sort our options by their names, (e.g. "--noImplicitAny" comes before "--watch")
+        return !!commandLine.options.all ?
+            ts.sort(ts.optionDeclarations, function (a, b) { return ts.compareStringsCaseInsensitive(a.name, b.name); }) :
+            ts.filter(ts.optionDeclarations.slice(), function (v) { return !!v.showInSimplifiedHelpView; });
+    }
     function executeCommandLine(args) {
+        if (args.length > 0 && ((args[0].toLowerCase() === "--build") || (args[0].toLowerCase() === "-b"))) {
+            var reportDiag_1 = ts.createDiagnosticReporter(ts.sys, /*pretty*/ true);
+            var report = function (message) {
+                var args = [];
+                for (var _i = 1; _i < arguments.length; _i++) {
+                    args[_i - 1] = arguments[_i];
+                }
+                return reportDiag_1(ts.createCompilerDiagnostic.apply(void 0, [message].concat(args)));
+            };
+            var buildHost = {
+                error: report,
+                verbose: report,
+                message: report,
+                errorDiagnostic: function (d) { return reportDiag_1(d); }
+            };
+            return ts.performBuild(args.slice(1), ts.createCompilerHost({}), buildHost, ts.sys);
+        }
         var commandLine = ts.parseCommandLine(args);
+        if (commandLine.options.build) {
+            reportDiagnostic(ts.createCompilerDiagnostic(ts.Diagnostics.Option_build_must_be_the_first_command_line_argument));
+            return ts.sys.exit(ts.ExitStatus.DiagnosticsPresent_OutputsSkipped);
+        }
+        // Configuration file name (if any)
         var configFileName;
         if (commandLine.options.locale) {
             ts.validateLocaleAndSetLanguage(commandLine.options.locale, ts.sys, commandLine.errors);
         }
+        // If there are any errors due to command line parsing and/or
+        // setting up localization, report them and quit.
         if (commandLine.errors.length > 0) {
             commandLine.errors.forEach(reportDiagnostic);
             return ts.sys.exit(ts.ExitStatus.DiagnosticsPresent_OutputsSkipped);
@@ -68701,12 +86292,12 @@ var ts;
             return ts.sys.exit(ts.ExitStatus.Success);
         }
         if (commandLine.options.version) {
-            printVersion();
+            ts.printVersion();
             return ts.sys.exit(ts.ExitStatus.Success);
         }
         if (commandLine.options.help || commandLine.options.all) {
-            printVersion();
-            printHelp(!!commandLine.options.all);
+            ts.printVersion();
+            ts.printHelp(getOptionsForHelp(commandLine));
             return ts.sys.exit(ts.ExitStatus.Success);
         }
         if (commandLine.options.project) {
@@ -68715,7 +86306,7 @@ var ts;
                 return ts.sys.exit(ts.ExitStatus.DiagnosticsPresent_OutputsSkipped);
             }
             var fileOrDirectory = ts.normalizePath(commandLine.options.project);
-            if (!fileOrDirectory || ts.sys.directoryExists(fileOrDirectory)) {
+            if (!fileOrDirectory /* current directory "." */ || ts.sys.directoryExists(fileOrDirectory)) {
                 configFileName = ts.combinePaths(fileOrDirectory, "tsconfig.json");
                 if (!ts.sys.fileExists(configFileName)) {
                     reportDiagnostic(ts.createCompilerDiagnostic(ts.Diagnostics.Cannot_find_a_tsconfig_json_file_at_the_specified_directory_Colon_0, commandLine.options.project));
@@ -68735,13 +86326,13 @@ var ts;
             configFileName = ts.findConfigFile(searchPath, ts.sys.fileExists);
         }
         if (commandLine.fileNames.length === 0 && !configFileName) {
-            printVersion();
-            printHelp(!!commandLine.options.all);
+            ts.printVersion();
+            ts.printHelp(getOptionsForHelp(commandLine));
             return ts.sys.exit(ts.ExitStatus.Success);
         }
         var commandLineOptions = commandLine.options;
         if (configFileName) {
-            var configParseResult = ts.parseConfigFileWithSystem(configFileName, commandLineOptions, ts.sys, reportDiagnostic);
+            var configParseResult = ts.parseConfigFileWithSystem(configFileName, commandLineOptions, ts.sys, reportDiagnostic); // TODO: GH#18217
             updateReportDiagnostic(configParseResult.options);
             if (ts.isWatchSet(configParseResult.options)) {
                 reportWatchModeWithoutSysSupport();
@@ -68758,7 +86349,7 @@ var ts;
                 createWatchOfFilesAndCompilerOptions(commandLine.fileNames, commandLineOptions);
             }
             else {
-                performCompilation(commandLine.fileNames, undefined, commandLineOptions);
+                performCompilation(commandLine.fileNames, /*references*/ undefined, commandLineOptions);
             }
         }
     }
@@ -68793,7 +86384,7 @@ var ts;
             }
             return compileUsingBuilder(rootNames, options, host, oldProgram, configFileParsingDiagnostics);
         };
-        var emitFilesUsingBuilder = watchCompilerHost.afterProgramCreate;
+        var emitFilesUsingBuilder = watchCompilerHost.afterProgramCreate; // TODO: GH#18217
         watchCompilerHost.afterProgramCreate = function (builderProgram) {
             emitFilesUsingBuilder(builderProgram);
             reportStatistics(builderProgram.getProgram());
@@ -68803,13 +86394,13 @@ var ts;
         return ts.createWatchStatusReporter(ts.sys, shouldBePretty(options));
     }
     function createWatchOfConfigFile(configParseResult, optionsToExtend) {
-        var watchCompilerHost = ts.createWatchCompilerHostOfConfigFile(configParseResult.options.configFilePath, optionsToExtend, ts.sys, undefined, reportDiagnostic, createWatchStatusReporter(configParseResult.options));
+        var watchCompilerHost = ts.createWatchCompilerHostOfConfigFile(configParseResult.options.configFilePath, optionsToExtend, ts.sys, /*createProgram*/ undefined, reportDiagnostic, createWatchStatusReporter(configParseResult.options)); // TODO: GH#18217
         updateWatchCompilationHost(watchCompilerHost);
         watchCompilerHost.configFileParsingResult = configParseResult;
         ts.createWatchProgram(watchCompilerHost);
     }
     function createWatchOfFilesAndCompilerOptions(rootFiles, options) {
-        var watchCompilerHost = ts.createWatchCompilerHostOfFilesAndCompilerOptions(rootFiles, options, ts.sys, undefined, reportDiagnostic, createWatchStatusReporter(options));
+        var watchCompilerHost = ts.createWatchCompilerHostOfFilesAndCompilerOptions(rootFiles, options, ts.sys, /*createProgram*/ undefined, reportDiagnostic, createWatchStatusReporter(options));
         updateWatchCompilationHost(watchCompilerHost);
         ts.createWatchProgram(watchCompilerHost);
     }
@@ -68841,6 +86432,10 @@ var ts;
                 ts.performance.forEachMeasure(function (name, duration) { return reportTimeStatistic(name + " time", duration); });
             }
             else {
+                // Individual component times.
+                // Note: To match the behavior of previous versions of the compiler, the reported parse time includes
+                // I/O read time and processing time for triple-slash references and module imports, and the reported
+                // emit time includes I/O write time. We preserve this behavior so we can accurately compare times.
                 reportTimeStatistic("I/O read", ts.performance.getDuration("I/O Read"));
                 reportTimeStatistic("I/O write", ts.performance.getDuration("I/O Write"));
                 reportTimeStatistic("Parse time", programTime);
@@ -68879,91 +86474,6 @@ var ts;
             reportStatisticalValue(name, (time / 1000).toFixed(2) + "s");
         }
     }
-    function printVersion() {
-        ts.sys.write(getDiagnosticText(ts.Diagnostics.Version_0, ts.version) + ts.sys.newLine);
-    }
-    function printHelp(showAllOptions) {
-        var output = [];
-        var syntaxLength = getDiagnosticText(ts.Diagnostics.Syntax_Colon_0, "").length;
-        var examplesLength = getDiagnosticText(ts.Diagnostics.Examples_Colon_0, "").length;
-        var marginLength = Math.max(syntaxLength, examplesLength);
-        var syntax = makePadding(marginLength - syntaxLength);
-        syntax += "tsc [" + getDiagnosticText(ts.Diagnostics.options) + "] [" + getDiagnosticText(ts.Diagnostics.file) + " ...]";
-        output.push(getDiagnosticText(ts.Diagnostics.Syntax_Colon_0, syntax));
-        output.push(ts.sys.newLine + ts.sys.newLine);
-        var padding = makePadding(marginLength);
-        output.push(getDiagnosticText(ts.Diagnostics.Examples_Colon_0, makePadding(marginLength - examplesLength) + "tsc hello.ts") + ts.sys.newLine);
-        output.push(padding + "tsc --outFile file.js file.ts" + ts.sys.newLine);
-        output.push(padding + "tsc @args.txt" + ts.sys.newLine);
-        output.push(ts.sys.newLine);
-        output.push(getDiagnosticText(ts.Diagnostics.Options_Colon) + ts.sys.newLine);
-        var optsList = showAllOptions ?
-            ts.sort(ts.optionDeclarations, function (a, b) { return ts.compareStringsCaseInsensitive(a.name, b.name); }) :
-            ts.filter(ts.optionDeclarations.slice(), function (v) { return !!v.showInSimplifiedHelpView; });
-        marginLength = 0;
-        var usageColumn = [];
-        var descriptionColumn = [];
-        var optionsDescriptionMap = ts.createMap();
-        for (var _i = 0, optsList_1 = optsList; _i < optsList_1.length; _i++) {
-            var option = optsList_1[_i];
-            if (!option.description) {
-                continue;
-            }
-            var usageText_1 = " ";
-            if (option.shortName) {
-                usageText_1 += "-" + option.shortName;
-                usageText_1 += getParamType(option);
-                usageText_1 += ", ";
-            }
-            usageText_1 += "--" + option.name;
-            usageText_1 += getParamType(option);
-            usageColumn.push(usageText_1);
-            var description = void 0;
-            if (option.name === "lib") {
-                description = getDiagnosticText(option.description);
-                var element = option.element;
-                var typeMap = element.type;
-                optionsDescriptionMap.set(description, ts.arrayFrom(typeMap.keys()).map(function (key) { return "'" + key + "'"; }));
-            }
-            else {
-                description = getDiagnosticText(option.description);
-            }
-            descriptionColumn.push(description);
-            marginLength = Math.max(usageText_1.length, marginLength);
-        }
-        var usageText = " @<" + getDiagnosticText(ts.Diagnostics.file) + ">";
-        usageColumn.push(usageText);
-        descriptionColumn.push(getDiagnosticText(ts.Diagnostics.Insert_command_line_options_and_files_from_a_file));
-        marginLength = Math.max(usageText.length, marginLength);
-        for (var i = 0; i < usageColumn.length; i++) {
-            var usage = usageColumn[i];
-            var description = descriptionColumn[i];
-            var kindsList = optionsDescriptionMap.get(description);
-            output.push(usage + makePadding(marginLength - usage.length + 2) + description + ts.sys.newLine);
-            if (kindsList) {
-                output.push(makePadding(marginLength + 4));
-                for (var _a = 0, kindsList_1 = kindsList; _a < kindsList_1.length; _a++) {
-                    var kind = kindsList_1[_a];
-                    output.push(kind + " ");
-                }
-                output.push(ts.sys.newLine);
-            }
-        }
-        for (var _b = 0, output_1 = output; _b < output_1.length; _b++) {
-            var line = output_1[_b];
-            ts.sys.write(line);
-        }
-        return;
-        function getParamType(option) {
-            if (option.paramType !== undefined) {
-                return " " + getDiagnosticText(option.paramType);
-            }
-            return "";
-        }
-        function makePadding(paddingLength) {
-            return Array(paddingLength + 1).join(" ");
-        }
-    }
     function writeConfigFile(options, fileNames) {
         var currentDirectory = ts.sys.getCurrentDirectory();
         var file = ts.normalizePath(ts.combinePaths(currentDirectory, "tsconfig.json"));
@@ -68987,3 +86497,4 @@ if (ts.sys.setBlocking) {
     ts.sys.setBlocking();
 }
 ts.executeCommandLine(ts.sys.args);
+//# sourceMappingURL=tsc.js.map
\ No newline at end of file
diff --git a/lib/tsserver.js b/lib/tsserver.js
index 035ba5afaf9..7d905fd3777 100644
--- a/lib/tsserver.js
+++ b/lib/tsserver.js
@@ -14,18 +14,6 @@ and limitations under the License.
 ***************************************************************************** */
 
 "use strict";
-var __assign = (this && this.__assign) || Object.assign || function(t) {
-    for (var s, i = 1, n = arguments.length; i < n; i++) {
-        s = arguments[i];
-        for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
-            t[p] = s[p];
-    }
-    return t;
-};
-var __makeTemplateObject = (this && this.__makeTemplateObject) || function (cooked, raw) {
-    if (Object.defineProperty) { Object.defineProperty(cooked, "raw", { value: raw }); } else { cooked.raw = raw; }
-    return cooked;
-};
 var __extends = (this && this.__extends) || (function () {
     var extendStatics = Object.setPrototypeOf ||
         ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
@@ -36,1314 +24,38 @@ var __extends = (this && this.__extends) || (function () {
         d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
     };
 })();
+var __assign = (this && this.__assign) || Object.assign || function(t) {
+    for (var s, i = 1, n = arguments.length; i < n; i++) {
+        s = arguments[i];
+        for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
+            t[p] = s[p];
+    }
+    return t;
+};
+"use strict";
+/*@internal*/
 var ts;
 (function (ts) {
-    var Comparison;
-    (function (Comparison) {
-        Comparison[Comparison["LessThan"] = -1] = "LessThan";
-        Comparison[Comparison["EqualTo"] = 0] = "EqualTo";
-        Comparison[Comparison["GreaterThan"] = 1] = "GreaterThan";
-    })(Comparison = ts.Comparison || (ts.Comparison = {}));
-    var SyntaxKind;
-    (function (SyntaxKind) {
-        SyntaxKind[SyntaxKind["Unknown"] = 0] = "Unknown";
-        SyntaxKind[SyntaxKind["EndOfFileToken"] = 1] = "EndOfFileToken";
-        SyntaxKind[SyntaxKind["SingleLineCommentTrivia"] = 2] = "SingleLineCommentTrivia";
-        SyntaxKind[SyntaxKind["MultiLineCommentTrivia"] = 3] = "MultiLineCommentTrivia";
-        SyntaxKind[SyntaxKind["NewLineTrivia"] = 4] = "NewLineTrivia";
-        SyntaxKind[SyntaxKind["WhitespaceTrivia"] = 5] = "WhitespaceTrivia";
-        SyntaxKind[SyntaxKind["ShebangTrivia"] = 6] = "ShebangTrivia";
-        SyntaxKind[SyntaxKind["ConflictMarkerTrivia"] = 7] = "ConflictMarkerTrivia";
-        SyntaxKind[SyntaxKind["NumericLiteral"] = 8] = "NumericLiteral";
-        SyntaxKind[SyntaxKind["StringLiteral"] = 9] = "StringLiteral";
-        SyntaxKind[SyntaxKind["JsxText"] = 10] = "JsxText";
-        SyntaxKind[SyntaxKind["JsxTextAllWhiteSpaces"] = 11] = "JsxTextAllWhiteSpaces";
-        SyntaxKind[SyntaxKind["RegularExpressionLiteral"] = 12] = "RegularExpressionLiteral";
-        SyntaxKind[SyntaxKind["NoSubstitutionTemplateLiteral"] = 13] = "NoSubstitutionTemplateLiteral";
-        SyntaxKind[SyntaxKind["TemplateHead"] = 14] = "TemplateHead";
-        SyntaxKind[SyntaxKind["TemplateMiddle"] = 15] = "TemplateMiddle";
-        SyntaxKind[SyntaxKind["TemplateTail"] = 16] = "TemplateTail";
-        SyntaxKind[SyntaxKind["OpenBraceToken"] = 17] = "OpenBraceToken";
-        SyntaxKind[SyntaxKind["CloseBraceToken"] = 18] = "CloseBraceToken";
-        SyntaxKind[SyntaxKind["OpenParenToken"] = 19] = "OpenParenToken";
-        SyntaxKind[SyntaxKind["CloseParenToken"] = 20] = "CloseParenToken";
-        SyntaxKind[SyntaxKind["OpenBracketToken"] = 21] = "OpenBracketToken";
-        SyntaxKind[SyntaxKind["CloseBracketToken"] = 22] = "CloseBracketToken";
-        SyntaxKind[SyntaxKind["DotToken"] = 23] = "DotToken";
-        SyntaxKind[SyntaxKind["DotDotDotToken"] = 24] = "DotDotDotToken";
-        SyntaxKind[SyntaxKind["SemicolonToken"] = 25] = "SemicolonToken";
-        SyntaxKind[SyntaxKind["CommaToken"] = 26] = "CommaToken";
-        SyntaxKind[SyntaxKind["LessThanToken"] = 27] = "LessThanToken";
-        SyntaxKind[SyntaxKind["LessThanSlashToken"] = 28] = "LessThanSlashToken";
-        SyntaxKind[SyntaxKind["GreaterThanToken"] = 29] = "GreaterThanToken";
-        SyntaxKind[SyntaxKind["LessThanEqualsToken"] = 30] = "LessThanEqualsToken";
-        SyntaxKind[SyntaxKind["GreaterThanEqualsToken"] = 31] = "GreaterThanEqualsToken";
-        SyntaxKind[SyntaxKind["EqualsEqualsToken"] = 32] = "EqualsEqualsToken";
-        SyntaxKind[SyntaxKind["ExclamationEqualsToken"] = 33] = "ExclamationEqualsToken";
-        SyntaxKind[SyntaxKind["EqualsEqualsEqualsToken"] = 34] = "EqualsEqualsEqualsToken";
-        SyntaxKind[SyntaxKind["ExclamationEqualsEqualsToken"] = 35] = "ExclamationEqualsEqualsToken";
-        SyntaxKind[SyntaxKind["EqualsGreaterThanToken"] = 36] = "EqualsGreaterThanToken";
-        SyntaxKind[SyntaxKind["PlusToken"] = 37] = "PlusToken";
-        SyntaxKind[SyntaxKind["MinusToken"] = 38] = "MinusToken";
-        SyntaxKind[SyntaxKind["AsteriskToken"] = 39] = "AsteriskToken";
-        SyntaxKind[SyntaxKind["AsteriskAsteriskToken"] = 40] = "AsteriskAsteriskToken";
-        SyntaxKind[SyntaxKind["SlashToken"] = 41] = "SlashToken";
-        SyntaxKind[SyntaxKind["PercentToken"] = 42] = "PercentToken";
-        SyntaxKind[SyntaxKind["PlusPlusToken"] = 43] = "PlusPlusToken";
-        SyntaxKind[SyntaxKind["MinusMinusToken"] = 44] = "MinusMinusToken";
-        SyntaxKind[SyntaxKind["LessThanLessThanToken"] = 45] = "LessThanLessThanToken";
-        SyntaxKind[SyntaxKind["GreaterThanGreaterThanToken"] = 46] = "GreaterThanGreaterThanToken";
-        SyntaxKind[SyntaxKind["GreaterThanGreaterThanGreaterThanToken"] = 47] = "GreaterThanGreaterThanGreaterThanToken";
-        SyntaxKind[SyntaxKind["AmpersandToken"] = 48] = "AmpersandToken";
-        SyntaxKind[SyntaxKind["BarToken"] = 49] = "BarToken";
-        SyntaxKind[SyntaxKind["CaretToken"] = 50] = "CaretToken";
-        SyntaxKind[SyntaxKind["ExclamationToken"] = 51] = "ExclamationToken";
-        SyntaxKind[SyntaxKind["TildeToken"] = 52] = "TildeToken";
-        SyntaxKind[SyntaxKind["AmpersandAmpersandToken"] = 53] = "AmpersandAmpersandToken";
-        SyntaxKind[SyntaxKind["BarBarToken"] = 54] = "BarBarToken";
-        SyntaxKind[SyntaxKind["QuestionToken"] = 55] = "QuestionToken";
-        SyntaxKind[SyntaxKind["ColonToken"] = 56] = "ColonToken";
-        SyntaxKind[SyntaxKind["AtToken"] = 57] = "AtToken";
-        SyntaxKind[SyntaxKind["EqualsToken"] = 58] = "EqualsToken";
-        SyntaxKind[SyntaxKind["PlusEqualsToken"] = 59] = "PlusEqualsToken";
-        SyntaxKind[SyntaxKind["MinusEqualsToken"] = 60] = "MinusEqualsToken";
-        SyntaxKind[SyntaxKind["AsteriskEqualsToken"] = 61] = "AsteriskEqualsToken";
-        SyntaxKind[SyntaxKind["AsteriskAsteriskEqualsToken"] = 62] = "AsteriskAsteriskEqualsToken";
-        SyntaxKind[SyntaxKind["SlashEqualsToken"] = 63] = "SlashEqualsToken";
-        SyntaxKind[SyntaxKind["PercentEqualsToken"] = 64] = "PercentEqualsToken";
-        SyntaxKind[SyntaxKind["LessThanLessThanEqualsToken"] = 65] = "LessThanLessThanEqualsToken";
-        SyntaxKind[SyntaxKind["GreaterThanGreaterThanEqualsToken"] = 66] = "GreaterThanGreaterThanEqualsToken";
-        SyntaxKind[SyntaxKind["GreaterThanGreaterThanGreaterThanEqualsToken"] = 67] = "GreaterThanGreaterThanGreaterThanEqualsToken";
-        SyntaxKind[SyntaxKind["AmpersandEqualsToken"] = 68] = "AmpersandEqualsToken";
-        SyntaxKind[SyntaxKind["BarEqualsToken"] = 69] = "BarEqualsToken";
-        SyntaxKind[SyntaxKind["CaretEqualsToken"] = 70] = "CaretEqualsToken";
-        SyntaxKind[SyntaxKind["Identifier"] = 71] = "Identifier";
-        SyntaxKind[SyntaxKind["BreakKeyword"] = 72] = "BreakKeyword";
-        SyntaxKind[SyntaxKind["CaseKeyword"] = 73] = "CaseKeyword";
-        SyntaxKind[SyntaxKind["CatchKeyword"] = 74] = "CatchKeyword";
-        SyntaxKind[SyntaxKind["ClassKeyword"] = 75] = "ClassKeyword";
-        SyntaxKind[SyntaxKind["ConstKeyword"] = 76] = "ConstKeyword";
-        SyntaxKind[SyntaxKind["ContinueKeyword"] = 77] = "ContinueKeyword";
-        SyntaxKind[SyntaxKind["DebuggerKeyword"] = 78] = "DebuggerKeyword";
-        SyntaxKind[SyntaxKind["DefaultKeyword"] = 79] = "DefaultKeyword";
-        SyntaxKind[SyntaxKind["DeleteKeyword"] = 80] = "DeleteKeyword";
-        SyntaxKind[SyntaxKind["DoKeyword"] = 81] = "DoKeyword";
-        SyntaxKind[SyntaxKind["ElseKeyword"] = 82] = "ElseKeyword";
-        SyntaxKind[SyntaxKind["EnumKeyword"] = 83] = "EnumKeyword";
-        SyntaxKind[SyntaxKind["ExportKeyword"] = 84] = "ExportKeyword";
-        SyntaxKind[SyntaxKind["ExtendsKeyword"] = 85] = "ExtendsKeyword";
-        SyntaxKind[SyntaxKind["FalseKeyword"] = 86] = "FalseKeyword";
-        SyntaxKind[SyntaxKind["FinallyKeyword"] = 87] = "FinallyKeyword";
-        SyntaxKind[SyntaxKind["ForKeyword"] = 88] = "ForKeyword";
-        SyntaxKind[SyntaxKind["FunctionKeyword"] = 89] = "FunctionKeyword";
-        SyntaxKind[SyntaxKind["IfKeyword"] = 90] = "IfKeyword";
-        SyntaxKind[SyntaxKind["ImportKeyword"] = 91] = "ImportKeyword";
-        SyntaxKind[SyntaxKind["InKeyword"] = 92] = "InKeyword";
-        SyntaxKind[SyntaxKind["InstanceOfKeyword"] = 93] = "InstanceOfKeyword";
-        SyntaxKind[SyntaxKind["NewKeyword"] = 94] = "NewKeyword";
-        SyntaxKind[SyntaxKind["NullKeyword"] = 95] = "NullKeyword";
-        SyntaxKind[SyntaxKind["ReturnKeyword"] = 96] = "ReturnKeyword";
-        SyntaxKind[SyntaxKind["SuperKeyword"] = 97] = "SuperKeyword";
-        SyntaxKind[SyntaxKind["SwitchKeyword"] = 98] = "SwitchKeyword";
-        SyntaxKind[SyntaxKind["ThisKeyword"] = 99] = "ThisKeyword";
-        SyntaxKind[SyntaxKind["ThrowKeyword"] = 100] = "ThrowKeyword";
-        SyntaxKind[SyntaxKind["TrueKeyword"] = 101] = "TrueKeyword";
-        SyntaxKind[SyntaxKind["TryKeyword"] = 102] = "TryKeyword";
-        SyntaxKind[SyntaxKind["TypeOfKeyword"] = 103] = "TypeOfKeyword";
-        SyntaxKind[SyntaxKind["VarKeyword"] = 104] = "VarKeyword";
-        SyntaxKind[SyntaxKind["VoidKeyword"] = 105] = "VoidKeyword";
-        SyntaxKind[SyntaxKind["WhileKeyword"] = 106] = "WhileKeyword";
-        SyntaxKind[SyntaxKind["WithKeyword"] = 107] = "WithKeyword";
-        SyntaxKind[SyntaxKind["ImplementsKeyword"] = 108] = "ImplementsKeyword";
-        SyntaxKind[SyntaxKind["InterfaceKeyword"] = 109] = "InterfaceKeyword";
-        SyntaxKind[SyntaxKind["LetKeyword"] = 110] = "LetKeyword";
-        SyntaxKind[SyntaxKind["PackageKeyword"] = 111] = "PackageKeyword";
-        SyntaxKind[SyntaxKind["PrivateKeyword"] = 112] = "PrivateKeyword";
-        SyntaxKind[SyntaxKind["ProtectedKeyword"] = 113] = "ProtectedKeyword";
-        SyntaxKind[SyntaxKind["PublicKeyword"] = 114] = "PublicKeyword";
-        SyntaxKind[SyntaxKind["StaticKeyword"] = 115] = "StaticKeyword";
-        SyntaxKind[SyntaxKind["YieldKeyword"] = 116] = "YieldKeyword";
-        SyntaxKind[SyntaxKind["AbstractKeyword"] = 117] = "AbstractKeyword";
-        SyntaxKind[SyntaxKind["AsKeyword"] = 118] = "AsKeyword";
-        SyntaxKind[SyntaxKind["AnyKeyword"] = 119] = "AnyKeyword";
-        SyntaxKind[SyntaxKind["AsyncKeyword"] = 120] = "AsyncKeyword";
-        SyntaxKind[SyntaxKind["AwaitKeyword"] = 121] = "AwaitKeyword";
-        SyntaxKind[SyntaxKind["BooleanKeyword"] = 122] = "BooleanKeyword";
-        SyntaxKind[SyntaxKind["ConstructorKeyword"] = 123] = "ConstructorKeyword";
-        SyntaxKind[SyntaxKind["DeclareKeyword"] = 124] = "DeclareKeyword";
-        SyntaxKind[SyntaxKind["GetKeyword"] = 125] = "GetKeyword";
-        SyntaxKind[SyntaxKind["InferKeyword"] = 126] = "InferKeyword";
-        SyntaxKind[SyntaxKind["IsKeyword"] = 127] = "IsKeyword";
-        SyntaxKind[SyntaxKind["KeyOfKeyword"] = 128] = "KeyOfKeyword";
-        SyntaxKind[SyntaxKind["ModuleKeyword"] = 129] = "ModuleKeyword";
-        SyntaxKind[SyntaxKind["NamespaceKeyword"] = 130] = "NamespaceKeyword";
-        SyntaxKind[SyntaxKind["NeverKeyword"] = 131] = "NeverKeyword";
-        SyntaxKind[SyntaxKind["ReadonlyKeyword"] = 132] = "ReadonlyKeyword";
-        SyntaxKind[SyntaxKind["RequireKeyword"] = 133] = "RequireKeyword";
-        SyntaxKind[SyntaxKind["NumberKeyword"] = 134] = "NumberKeyword";
-        SyntaxKind[SyntaxKind["ObjectKeyword"] = 135] = "ObjectKeyword";
-        SyntaxKind[SyntaxKind["SetKeyword"] = 136] = "SetKeyword";
-        SyntaxKind[SyntaxKind["StringKeyword"] = 137] = "StringKeyword";
-        SyntaxKind[SyntaxKind["SymbolKeyword"] = 138] = "SymbolKeyword";
-        SyntaxKind[SyntaxKind["TypeKeyword"] = 139] = "TypeKeyword";
-        SyntaxKind[SyntaxKind["UndefinedKeyword"] = 140] = "UndefinedKeyword";
-        SyntaxKind[SyntaxKind["UniqueKeyword"] = 141] = "UniqueKeyword";
-        SyntaxKind[SyntaxKind["UnknownKeyword"] = 142] = "UnknownKeyword";
-        SyntaxKind[SyntaxKind["FromKeyword"] = 143] = "FromKeyword";
-        SyntaxKind[SyntaxKind["GlobalKeyword"] = 144] = "GlobalKeyword";
-        SyntaxKind[SyntaxKind["OfKeyword"] = 145] = "OfKeyword";
-        SyntaxKind[SyntaxKind["QualifiedName"] = 146] = "QualifiedName";
-        SyntaxKind[SyntaxKind["ComputedPropertyName"] = 147] = "ComputedPropertyName";
-        SyntaxKind[SyntaxKind["TypeParameter"] = 148] = "TypeParameter";
-        SyntaxKind[SyntaxKind["Parameter"] = 149] = "Parameter";
-        SyntaxKind[SyntaxKind["Decorator"] = 150] = "Decorator";
-        SyntaxKind[SyntaxKind["PropertySignature"] = 151] = "PropertySignature";
-        SyntaxKind[SyntaxKind["PropertyDeclaration"] = 152] = "PropertyDeclaration";
-        SyntaxKind[SyntaxKind["MethodSignature"] = 153] = "MethodSignature";
-        SyntaxKind[SyntaxKind["MethodDeclaration"] = 154] = "MethodDeclaration";
-        SyntaxKind[SyntaxKind["Constructor"] = 155] = "Constructor";
-        SyntaxKind[SyntaxKind["GetAccessor"] = 156] = "GetAccessor";
-        SyntaxKind[SyntaxKind["SetAccessor"] = 157] = "SetAccessor";
-        SyntaxKind[SyntaxKind["CallSignature"] = 158] = "CallSignature";
-        SyntaxKind[SyntaxKind["ConstructSignature"] = 159] = "ConstructSignature";
-        SyntaxKind[SyntaxKind["IndexSignature"] = 160] = "IndexSignature";
-        SyntaxKind[SyntaxKind["TypePredicate"] = 161] = "TypePredicate";
-        SyntaxKind[SyntaxKind["TypeReference"] = 162] = "TypeReference";
-        SyntaxKind[SyntaxKind["FunctionType"] = 163] = "FunctionType";
-        SyntaxKind[SyntaxKind["ConstructorType"] = 164] = "ConstructorType";
-        SyntaxKind[SyntaxKind["TypeQuery"] = 165] = "TypeQuery";
-        SyntaxKind[SyntaxKind["TypeLiteral"] = 166] = "TypeLiteral";
-        SyntaxKind[SyntaxKind["ArrayType"] = 167] = "ArrayType";
-        SyntaxKind[SyntaxKind["TupleType"] = 168] = "TupleType";
-        SyntaxKind[SyntaxKind["UnionType"] = 169] = "UnionType";
-        SyntaxKind[SyntaxKind["IntersectionType"] = 170] = "IntersectionType";
-        SyntaxKind[SyntaxKind["ConditionalType"] = 171] = "ConditionalType";
-        SyntaxKind[SyntaxKind["InferType"] = 172] = "InferType";
-        SyntaxKind[SyntaxKind["ParenthesizedType"] = 173] = "ParenthesizedType";
-        SyntaxKind[SyntaxKind["ThisType"] = 174] = "ThisType";
-        SyntaxKind[SyntaxKind["TypeOperator"] = 175] = "TypeOperator";
-        SyntaxKind[SyntaxKind["IndexedAccessType"] = 176] = "IndexedAccessType";
-        SyntaxKind[SyntaxKind["MappedType"] = 177] = "MappedType";
-        SyntaxKind[SyntaxKind["LiteralType"] = 178] = "LiteralType";
-        SyntaxKind[SyntaxKind["ImportType"] = 179] = "ImportType";
-        SyntaxKind[SyntaxKind["ObjectBindingPattern"] = 180] = "ObjectBindingPattern";
-        SyntaxKind[SyntaxKind["ArrayBindingPattern"] = 181] = "ArrayBindingPattern";
-        SyntaxKind[SyntaxKind["BindingElement"] = 182] = "BindingElement";
-        SyntaxKind[SyntaxKind["ArrayLiteralExpression"] = 183] = "ArrayLiteralExpression";
-        SyntaxKind[SyntaxKind["ObjectLiteralExpression"] = 184] = "ObjectLiteralExpression";
-        SyntaxKind[SyntaxKind["PropertyAccessExpression"] = 185] = "PropertyAccessExpression";
-        SyntaxKind[SyntaxKind["ElementAccessExpression"] = 186] = "ElementAccessExpression";
-        SyntaxKind[SyntaxKind["CallExpression"] = 187] = "CallExpression";
-        SyntaxKind[SyntaxKind["NewExpression"] = 188] = "NewExpression";
-        SyntaxKind[SyntaxKind["TaggedTemplateExpression"] = 189] = "TaggedTemplateExpression";
-        SyntaxKind[SyntaxKind["TypeAssertionExpression"] = 190] = "TypeAssertionExpression";
-        SyntaxKind[SyntaxKind["ParenthesizedExpression"] = 191] = "ParenthesizedExpression";
-        SyntaxKind[SyntaxKind["FunctionExpression"] = 192] = "FunctionExpression";
-        SyntaxKind[SyntaxKind["ArrowFunction"] = 193] = "ArrowFunction";
-        SyntaxKind[SyntaxKind["DeleteExpression"] = 194] = "DeleteExpression";
-        SyntaxKind[SyntaxKind["TypeOfExpression"] = 195] = "TypeOfExpression";
-        SyntaxKind[SyntaxKind["VoidExpression"] = 196] = "VoidExpression";
-        SyntaxKind[SyntaxKind["AwaitExpression"] = 197] = "AwaitExpression";
-        SyntaxKind[SyntaxKind["PrefixUnaryExpression"] = 198] = "PrefixUnaryExpression";
-        SyntaxKind[SyntaxKind["PostfixUnaryExpression"] = 199] = "PostfixUnaryExpression";
-        SyntaxKind[SyntaxKind["BinaryExpression"] = 200] = "BinaryExpression";
-        SyntaxKind[SyntaxKind["ConditionalExpression"] = 201] = "ConditionalExpression";
-        SyntaxKind[SyntaxKind["TemplateExpression"] = 202] = "TemplateExpression";
-        SyntaxKind[SyntaxKind["YieldExpression"] = 203] = "YieldExpression";
-        SyntaxKind[SyntaxKind["SpreadElement"] = 204] = "SpreadElement";
-        SyntaxKind[SyntaxKind["ClassExpression"] = 205] = "ClassExpression";
-        SyntaxKind[SyntaxKind["OmittedExpression"] = 206] = "OmittedExpression";
-        SyntaxKind[SyntaxKind["ExpressionWithTypeArguments"] = 207] = "ExpressionWithTypeArguments";
-        SyntaxKind[SyntaxKind["AsExpression"] = 208] = "AsExpression";
-        SyntaxKind[SyntaxKind["NonNullExpression"] = 209] = "NonNullExpression";
-        SyntaxKind[SyntaxKind["MetaProperty"] = 210] = "MetaProperty";
-        SyntaxKind[SyntaxKind["TemplateSpan"] = 211] = "TemplateSpan";
-        SyntaxKind[SyntaxKind["SemicolonClassElement"] = 212] = "SemicolonClassElement";
-        SyntaxKind[SyntaxKind["Block"] = 213] = "Block";
-        SyntaxKind[SyntaxKind["VariableStatement"] = 214] = "VariableStatement";
-        SyntaxKind[SyntaxKind["EmptyStatement"] = 215] = "EmptyStatement";
-        SyntaxKind[SyntaxKind["ExpressionStatement"] = 216] = "ExpressionStatement";
-        SyntaxKind[SyntaxKind["IfStatement"] = 217] = "IfStatement";
-        SyntaxKind[SyntaxKind["DoStatement"] = 218] = "DoStatement";
-        SyntaxKind[SyntaxKind["WhileStatement"] = 219] = "WhileStatement";
-        SyntaxKind[SyntaxKind["ForStatement"] = 220] = "ForStatement";
-        SyntaxKind[SyntaxKind["ForInStatement"] = 221] = "ForInStatement";
-        SyntaxKind[SyntaxKind["ForOfStatement"] = 222] = "ForOfStatement";
-        SyntaxKind[SyntaxKind["ContinueStatement"] = 223] = "ContinueStatement";
-        SyntaxKind[SyntaxKind["BreakStatement"] = 224] = "BreakStatement";
-        SyntaxKind[SyntaxKind["ReturnStatement"] = 225] = "ReturnStatement";
-        SyntaxKind[SyntaxKind["WithStatement"] = 226] = "WithStatement";
-        SyntaxKind[SyntaxKind["SwitchStatement"] = 227] = "SwitchStatement";
-        SyntaxKind[SyntaxKind["LabeledStatement"] = 228] = "LabeledStatement";
-        SyntaxKind[SyntaxKind["ThrowStatement"] = 229] = "ThrowStatement";
-        SyntaxKind[SyntaxKind["TryStatement"] = 230] = "TryStatement";
-        SyntaxKind[SyntaxKind["DebuggerStatement"] = 231] = "DebuggerStatement";
-        SyntaxKind[SyntaxKind["VariableDeclaration"] = 232] = "VariableDeclaration";
-        SyntaxKind[SyntaxKind["VariableDeclarationList"] = 233] = "VariableDeclarationList";
-        SyntaxKind[SyntaxKind["FunctionDeclaration"] = 234] = "FunctionDeclaration";
-        SyntaxKind[SyntaxKind["ClassDeclaration"] = 235] = "ClassDeclaration";
-        SyntaxKind[SyntaxKind["InterfaceDeclaration"] = 236] = "InterfaceDeclaration";
-        SyntaxKind[SyntaxKind["TypeAliasDeclaration"] = 237] = "TypeAliasDeclaration";
-        SyntaxKind[SyntaxKind["EnumDeclaration"] = 238] = "EnumDeclaration";
-        SyntaxKind[SyntaxKind["ModuleDeclaration"] = 239] = "ModuleDeclaration";
-        SyntaxKind[SyntaxKind["ModuleBlock"] = 240] = "ModuleBlock";
-        SyntaxKind[SyntaxKind["CaseBlock"] = 241] = "CaseBlock";
-        SyntaxKind[SyntaxKind["NamespaceExportDeclaration"] = 242] = "NamespaceExportDeclaration";
-        SyntaxKind[SyntaxKind["ImportEqualsDeclaration"] = 243] = "ImportEqualsDeclaration";
-        SyntaxKind[SyntaxKind["ImportDeclaration"] = 244] = "ImportDeclaration";
-        SyntaxKind[SyntaxKind["ImportClause"] = 245] = "ImportClause";
-        SyntaxKind[SyntaxKind["NamespaceImport"] = 246] = "NamespaceImport";
-        SyntaxKind[SyntaxKind["NamedImports"] = 247] = "NamedImports";
-        SyntaxKind[SyntaxKind["ImportSpecifier"] = 248] = "ImportSpecifier";
-        SyntaxKind[SyntaxKind["ExportAssignment"] = 249] = "ExportAssignment";
-        SyntaxKind[SyntaxKind["ExportDeclaration"] = 250] = "ExportDeclaration";
-        SyntaxKind[SyntaxKind["NamedExports"] = 251] = "NamedExports";
-        SyntaxKind[SyntaxKind["ExportSpecifier"] = 252] = "ExportSpecifier";
-        SyntaxKind[SyntaxKind["MissingDeclaration"] = 253] = "MissingDeclaration";
-        SyntaxKind[SyntaxKind["ExternalModuleReference"] = 254] = "ExternalModuleReference";
-        SyntaxKind[SyntaxKind["JsxElement"] = 255] = "JsxElement";
-        SyntaxKind[SyntaxKind["JsxSelfClosingElement"] = 256] = "JsxSelfClosingElement";
-        SyntaxKind[SyntaxKind["JsxOpeningElement"] = 257] = "JsxOpeningElement";
-        SyntaxKind[SyntaxKind["JsxClosingElement"] = 258] = "JsxClosingElement";
-        SyntaxKind[SyntaxKind["JsxFragment"] = 259] = "JsxFragment";
-        SyntaxKind[SyntaxKind["JsxOpeningFragment"] = 260] = "JsxOpeningFragment";
-        SyntaxKind[SyntaxKind["JsxClosingFragment"] = 261] = "JsxClosingFragment";
-        SyntaxKind[SyntaxKind["JsxAttribute"] = 262] = "JsxAttribute";
-        SyntaxKind[SyntaxKind["JsxAttributes"] = 263] = "JsxAttributes";
-        SyntaxKind[SyntaxKind["JsxSpreadAttribute"] = 264] = "JsxSpreadAttribute";
-        SyntaxKind[SyntaxKind["JsxExpression"] = 265] = "JsxExpression";
-        SyntaxKind[SyntaxKind["CaseClause"] = 266] = "CaseClause";
-        SyntaxKind[SyntaxKind["DefaultClause"] = 267] = "DefaultClause";
-        SyntaxKind[SyntaxKind["HeritageClause"] = 268] = "HeritageClause";
-        SyntaxKind[SyntaxKind["CatchClause"] = 269] = "CatchClause";
-        SyntaxKind[SyntaxKind["PropertyAssignment"] = 270] = "PropertyAssignment";
-        SyntaxKind[SyntaxKind["ShorthandPropertyAssignment"] = 271] = "ShorthandPropertyAssignment";
-        SyntaxKind[SyntaxKind["SpreadAssignment"] = 272] = "SpreadAssignment";
-        SyntaxKind[SyntaxKind["EnumMember"] = 273] = "EnumMember";
-        SyntaxKind[SyntaxKind["SourceFile"] = 274] = "SourceFile";
-        SyntaxKind[SyntaxKind["Bundle"] = 275] = "Bundle";
-        SyntaxKind[SyntaxKind["UnparsedSource"] = 276] = "UnparsedSource";
-        SyntaxKind[SyntaxKind["InputFiles"] = 277] = "InputFiles";
-        SyntaxKind[SyntaxKind["JSDocTypeExpression"] = 278] = "JSDocTypeExpression";
-        SyntaxKind[SyntaxKind["JSDocAllType"] = 279] = "JSDocAllType";
-        SyntaxKind[SyntaxKind["JSDocUnknownType"] = 280] = "JSDocUnknownType";
-        SyntaxKind[SyntaxKind["JSDocNullableType"] = 281] = "JSDocNullableType";
-        SyntaxKind[SyntaxKind["JSDocNonNullableType"] = 282] = "JSDocNonNullableType";
-        SyntaxKind[SyntaxKind["JSDocOptionalType"] = 283] = "JSDocOptionalType";
-        SyntaxKind[SyntaxKind["JSDocFunctionType"] = 284] = "JSDocFunctionType";
-        SyntaxKind[SyntaxKind["JSDocVariadicType"] = 285] = "JSDocVariadicType";
-        SyntaxKind[SyntaxKind["JSDocComment"] = 286] = "JSDocComment";
-        SyntaxKind[SyntaxKind["JSDocTypeLiteral"] = 287] = "JSDocTypeLiteral";
-        SyntaxKind[SyntaxKind["JSDocSignature"] = 288] = "JSDocSignature";
-        SyntaxKind[SyntaxKind["JSDocTag"] = 289] = "JSDocTag";
-        SyntaxKind[SyntaxKind["JSDocAugmentsTag"] = 290] = "JSDocAugmentsTag";
-        SyntaxKind[SyntaxKind["JSDocClassTag"] = 291] = "JSDocClassTag";
-        SyntaxKind[SyntaxKind["JSDocCallbackTag"] = 292] = "JSDocCallbackTag";
-        SyntaxKind[SyntaxKind["JSDocParameterTag"] = 293] = "JSDocParameterTag";
-        SyntaxKind[SyntaxKind["JSDocReturnTag"] = 294] = "JSDocReturnTag";
-        SyntaxKind[SyntaxKind["JSDocTypeTag"] = 295] = "JSDocTypeTag";
-        SyntaxKind[SyntaxKind["JSDocTemplateTag"] = 296] = "JSDocTemplateTag";
-        SyntaxKind[SyntaxKind["JSDocTypedefTag"] = 297] = "JSDocTypedefTag";
-        SyntaxKind[SyntaxKind["JSDocPropertyTag"] = 298] = "JSDocPropertyTag";
-        SyntaxKind[SyntaxKind["SyntaxList"] = 299] = "SyntaxList";
-        SyntaxKind[SyntaxKind["NotEmittedStatement"] = 300] = "NotEmittedStatement";
-        SyntaxKind[SyntaxKind["PartiallyEmittedExpression"] = 301] = "PartiallyEmittedExpression";
-        SyntaxKind[SyntaxKind["CommaListExpression"] = 302] = "CommaListExpression";
-        SyntaxKind[SyntaxKind["MergeDeclarationMarker"] = 303] = "MergeDeclarationMarker";
-        SyntaxKind[SyntaxKind["EndOfDeclarationMarker"] = 304] = "EndOfDeclarationMarker";
-        SyntaxKind[SyntaxKind["Count"] = 305] = "Count";
-        SyntaxKind[SyntaxKind["FirstAssignment"] = 58] = "FirstAssignment";
-        SyntaxKind[SyntaxKind["LastAssignment"] = 70] = "LastAssignment";
-        SyntaxKind[SyntaxKind["FirstCompoundAssignment"] = 59] = "FirstCompoundAssignment";
-        SyntaxKind[SyntaxKind["LastCompoundAssignment"] = 70] = "LastCompoundAssignment";
-        SyntaxKind[SyntaxKind["FirstReservedWord"] = 72] = "FirstReservedWord";
-        SyntaxKind[SyntaxKind["LastReservedWord"] = 107] = "LastReservedWord";
-        SyntaxKind[SyntaxKind["FirstKeyword"] = 72] = "FirstKeyword";
-        SyntaxKind[SyntaxKind["LastKeyword"] = 145] = "LastKeyword";
-        SyntaxKind[SyntaxKind["FirstFutureReservedWord"] = 108] = "FirstFutureReservedWord";
-        SyntaxKind[SyntaxKind["LastFutureReservedWord"] = 116] = "LastFutureReservedWord";
-        SyntaxKind[SyntaxKind["FirstTypeNode"] = 161] = "FirstTypeNode";
-        SyntaxKind[SyntaxKind["LastTypeNode"] = 179] = "LastTypeNode";
-        SyntaxKind[SyntaxKind["FirstPunctuation"] = 17] = "FirstPunctuation";
-        SyntaxKind[SyntaxKind["LastPunctuation"] = 70] = "LastPunctuation";
-        SyntaxKind[SyntaxKind["FirstToken"] = 0] = "FirstToken";
-        SyntaxKind[SyntaxKind["LastToken"] = 145] = "LastToken";
-        SyntaxKind[SyntaxKind["FirstTriviaToken"] = 2] = "FirstTriviaToken";
-        SyntaxKind[SyntaxKind["LastTriviaToken"] = 7] = "LastTriviaToken";
-        SyntaxKind[SyntaxKind["FirstLiteralToken"] = 8] = "FirstLiteralToken";
-        SyntaxKind[SyntaxKind["LastLiteralToken"] = 13] = "LastLiteralToken";
-        SyntaxKind[SyntaxKind["FirstTemplateToken"] = 13] = "FirstTemplateToken";
-        SyntaxKind[SyntaxKind["LastTemplateToken"] = 16] = "LastTemplateToken";
-        SyntaxKind[SyntaxKind["FirstBinaryOperator"] = 27] = "FirstBinaryOperator";
-        SyntaxKind[SyntaxKind["LastBinaryOperator"] = 70] = "LastBinaryOperator";
-        SyntaxKind[SyntaxKind["FirstNode"] = 146] = "FirstNode";
-        SyntaxKind[SyntaxKind["FirstJSDocNode"] = 278] = "FirstJSDocNode";
-        SyntaxKind[SyntaxKind["LastJSDocNode"] = 298] = "LastJSDocNode";
-        SyntaxKind[SyntaxKind["FirstJSDocTagNode"] = 289] = "FirstJSDocTagNode";
-        SyntaxKind[SyntaxKind["LastJSDocTagNode"] = 298] = "LastJSDocTagNode";
-        SyntaxKind[SyntaxKind["FirstContextualKeyword"] = 117] = "FirstContextualKeyword";
-        SyntaxKind[SyntaxKind["LastContextualKeyword"] = 145] = "LastContextualKeyword";
-    })(SyntaxKind = ts.SyntaxKind || (ts.SyntaxKind = {}));
-    var NodeFlags;
-    (function (NodeFlags) {
-        NodeFlags[NodeFlags["None"] = 0] = "None";
-        NodeFlags[NodeFlags["Let"] = 1] = "Let";
-        NodeFlags[NodeFlags["Const"] = 2] = "Const";
-        NodeFlags[NodeFlags["NestedNamespace"] = 4] = "NestedNamespace";
-        NodeFlags[NodeFlags["Synthesized"] = 8] = "Synthesized";
-        NodeFlags[NodeFlags["Namespace"] = 16] = "Namespace";
-        NodeFlags[NodeFlags["ExportContext"] = 32] = "ExportContext";
-        NodeFlags[NodeFlags["ContainsThis"] = 64] = "ContainsThis";
-        NodeFlags[NodeFlags["HasImplicitReturn"] = 128] = "HasImplicitReturn";
-        NodeFlags[NodeFlags["HasExplicitReturn"] = 256] = "HasExplicitReturn";
-        NodeFlags[NodeFlags["GlobalAugmentation"] = 512] = "GlobalAugmentation";
-        NodeFlags[NodeFlags["HasAsyncFunctions"] = 1024] = "HasAsyncFunctions";
-        NodeFlags[NodeFlags["DisallowInContext"] = 2048] = "DisallowInContext";
-        NodeFlags[NodeFlags["YieldContext"] = 4096] = "YieldContext";
-        NodeFlags[NodeFlags["DecoratorContext"] = 8192] = "DecoratorContext";
-        NodeFlags[NodeFlags["AwaitContext"] = 16384] = "AwaitContext";
-        NodeFlags[NodeFlags["ThisNodeHasError"] = 32768] = "ThisNodeHasError";
-        NodeFlags[NodeFlags["JavaScriptFile"] = 65536] = "JavaScriptFile";
-        NodeFlags[NodeFlags["ThisNodeOrAnySubNodesHasError"] = 131072] = "ThisNodeOrAnySubNodesHasError";
-        NodeFlags[NodeFlags["HasAggregatedChildData"] = 262144] = "HasAggregatedChildData";
-        NodeFlags[NodeFlags["PossiblyContainsDynamicImport"] = 524288] = "PossiblyContainsDynamicImport";
-        NodeFlags[NodeFlags["PossiblyContainsImportMeta"] = 1048576] = "PossiblyContainsImportMeta";
-        NodeFlags[NodeFlags["JSDoc"] = 2097152] = "JSDoc";
-        NodeFlags[NodeFlags["Ambient"] = 4194304] = "Ambient";
-        NodeFlags[NodeFlags["InWithStatement"] = 8388608] = "InWithStatement";
-        NodeFlags[NodeFlags["JsonFile"] = 16777216] = "JsonFile";
-        NodeFlags[NodeFlags["BlockScoped"] = 3] = "BlockScoped";
-        NodeFlags[NodeFlags["ReachabilityCheckFlags"] = 384] = "ReachabilityCheckFlags";
-        NodeFlags[NodeFlags["ReachabilityAndEmitFlags"] = 1408] = "ReachabilityAndEmitFlags";
-        NodeFlags[NodeFlags["ContextFlags"] = 12679168] = "ContextFlags";
-        NodeFlags[NodeFlags["TypeExcludesFlags"] = 20480] = "TypeExcludesFlags";
-        NodeFlags[NodeFlags["PermanentlySetIncrementalFlags"] = 1572864] = "PermanentlySetIncrementalFlags";
-    })(NodeFlags = ts.NodeFlags || (ts.NodeFlags = {}));
-    var ModifierFlags;
-    (function (ModifierFlags) {
-        ModifierFlags[ModifierFlags["None"] = 0] = "None";
-        ModifierFlags[ModifierFlags["Export"] = 1] = "Export";
-        ModifierFlags[ModifierFlags["Ambient"] = 2] = "Ambient";
-        ModifierFlags[ModifierFlags["Public"] = 4] = "Public";
-        ModifierFlags[ModifierFlags["Private"] = 8] = "Private";
-        ModifierFlags[ModifierFlags["Protected"] = 16] = "Protected";
-        ModifierFlags[ModifierFlags["Static"] = 32] = "Static";
-        ModifierFlags[ModifierFlags["Readonly"] = 64] = "Readonly";
-        ModifierFlags[ModifierFlags["Abstract"] = 128] = "Abstract";
-        ModifierFlags[ModifierFlags["Async"] = 256] = "Async";
-        ModifierFlags[ModifierFlags["Default"] = 512] = "Default";
-        ModifierFlags[ModifierFlags["Const"] = 2048] = "Const";
-        ModifierFlags[ModifierFlags["HasComputedFlags"] = 536870912] = "HasComputedFlags";
-        ModifierFlags[ModifierFlags["AccessibilityModifier"] = 28] = "AccessibilityModifier";
-        ModifierFlags[ModifierFlags["ParameterPropertyModifier"] = 92] = "ParameterPropertyModifier";
-        ModifierFlags[ModifierFlags["NonPublicAccessibilityModifier"] = 24] = "NonPublicAccessibilityModifier";
-        ModifierFlags[ModifierFlags["TypeScriptModifier"] = 2270] = "TypeScriptModifier";
-        ModifierFlags[ModifierFlags["ExportDefault"] = 513] = "ExportDefault";
-        ModifierFlags[ModifierFlags["All"] = 3071] = "All";
-    })(ModifierFlags = ts.ModifierFlags || (ts.ModifierFlags = {}));
-    var JsxFlags;
-    (function (JsxFlags) {
-        JsxFlags[JsxFlags["None"] = 0] = "None";
-        JsxFlags[JsxFlags["IntrinsicNamedElement"] = 1] = "IntrinsicNamedElement";
-        JsxFlags[JsxFlags["IntrinsicIndexedElement"] = 2] = "IntrinsicIndexedElement";
-        JsxFlags[JsxFlags["IntrinsicElement"] = 3] = "IntrinsicElement";
-    })(JsxFlags = ts.JsxFlags || (ts.JsxFlags = {}));
-    var RelationComparisonResult;
-    (function (RelationComparisonResult) {
-        RelationComparisonResult[RelationComparisonResult["Succeeded"] = 1] = "Succeeded";
-        RelationComparisonResult[RelationComparisonResult["Failed"] = 2] = "Failed";
-        RelationComparisonResult[RelationComparisonResult["FailedAndReported"] = 3] = "FailedAndReported";
-    })(RelationComparisonResult = ts.RelationComparisonResult || (ts.RelationComparisonResult = {}));
-    var GeneratedIdentifierFlags;
-    (function (GeneratedIdentifierFlags) {
-        GeneratedIdentifierFlags[GeneratedIdentifierFlags["None"] = 0] = "None";
-        GeneratedIdentifierFlags[GeneratedIdentifierFlags["Auto"] = 1] = "Auto";
-        GeneratedIdentifierFlags[GeneratedIdentifierFlags["Loop"] = 2] = "Loop";
-        GeneratedIdentifierFlags[GeneratedIdentifierFlags["Unique"] = 3] = "Unique";
-        GeneratedIdentifierFlags[GeneratedIdentifierFlags["Node"] = 4] = "Node";
-        GeneratedIdentifierFlags[GeneratedIdentifierFlags["KindMask"] = 7] = "KindMask";
-        GeneratedIdentifierFlags[GeneratedIdentifierFlags["ReservedInNestedScopes"] = 8] = "ReservedInNestedScopes";
-        GeneratedIdentifierFlags[GeneratedIdentifierFlags["Optimistic"] = 16] = "Optimistic";
-        GeneratedIdentifierFlags[GeneratedIdentifierFlags["FileLevel"] = 32] = "FileLevel";
-    })(GeneratedIdentifierFlags = ts.GeneratedIdentifierFlags || (ts.GeneratedIdentifierFlags = {}));
-    var TokenFlags;
-    (function (TokenFlags) {
-        TokenFlags[TokenFlags["None"] = 0] = "None";
-        TokenFlags[TokenFlags["PrecedingLineBreak"] = 1] = "PrecedingLineBreak";
-        TokenFlags[TokenFlags["PrecedingJSDocComment"] = 2] = "PrecedingJSDocComment";
-        TokenFlags[TokenFlags["Unterminated"] = 4] = "Unterminated";
-        TokenFlags[TokenFlags["ExtendedUnicodeEscape"] = 8] = "ExtendedUnicodeEscape";
-        TokenFlags[TokenFlags["Scientific"] = 16] = "Scientific";
-        TokenFlags[TokenFlags["Octal"] = 32] = "Octal";
-        TokenFlags[TokenFlags["HexSpecifier"] = 64] = "HexSpecifier";
-        TokenFlags[TokenFlags["BinarySpecifier"] = 128] = "BinarySpecifier";
-        TokenFlags[TokenFlags["OctalSpecifier"] = 256] = "OctalSpecifier";
-        TokenFlags[TokenFlags["ContainsSeparator"] = 512] = "ContainsSeparator";
-        TokenFlags[TokenFlags["BinaryOrOctalSpecifier"] = 384] = "BinaryOrOctalSpecifier";
-        TokenFlags[TokenFlags["NumericLiteralFlags"] = 1008] = "NumericLiteralFlags";
-    })(TokenFlags = ts.TokenFlags || (ts.TokenFlags = {}));
-    var FlowFlags;
-    (function (FlowFlags) {
-        FlowFlags[FlowFlags["Unreachable"] = 1] = "Unreachable";
-        FlowFlags[FlowFlags["Start"] = 2] = "Start";
-        FlowFlags[FlowFlags["BranchLabel"] = 4] = "BranchLabel";
-        FlowFlags[FlowFlags["LoopLabel"] = 8] = "LoopLabel";
-        FlowFlags[FlowFlags["Assignment"] = 16] = "Assignment";
-        FlowFlags[FlowFlags["TrueCondition"] = 32] = "TrueCondition";
-        FlowFlags[FlowFlags["FalseCondition"] = 64] = "FalseCondition";
-        FlowFlags[FlowFlags["SwitchClause"] = 128] = "SwitchClause";
-        FlowFlags[FlowFlags["ArrayMutation"] = 256] = "ArrayMutation";
-        FlowFlags[FlowFlags["Referenced"] = 512] = "Referenced";
-        FlowFlags[FlowFlags["Shared"] = 1024] = "Shared";
-        FlowFlags[FlowFlags["PreFinally"] = 2048] = "PreFinally";
-        FlowFlags[FlowFlags["AfterFinally"] = 4096] = "AfterFinally";
-        FlowFlags[FlowFlags["Label"] = 12] = "Label";
-        FlowFlags[FlowFlags["Condition"] = 96] = "Condition";
-    })(FlowFlags = ts.FlowFlags || (ts.FlowFlags = {}));
-    var OperationCanceledException = (function () {
-        function OperationCanceledException() {
-        }
-        return OperationCanceledException;
-    }());
-    ts.OperationCanceledException = OperationCanceledException;
-    var StructureIsReused;
-    (function (StructureIsReused) {
-        StructureIsReused[StructureIsReused["Not"] = 0] = "Not";
-        StructureIsReused[StructureIsReused["SafeModules"] = 1] = "SafeModules";
-        StructureIsReused[StructureIsReused["Completely"] = 2] = "Completely";
-    })(StructureIsReused = ts.StructureIsReused || (ts.StructureIsReused = {}));
-    var ExitStatus;
-    (function (ExitStatus) {
-        ExitStatus[ExitStatus["Success"] = 0] = "Success";
-        ExitStatus[ExitStatus["DiagnosticsPresent_OutputsSkipped"] = 1] = "DiagnosticsPresent_OutputsSkipped";
-        ExitStatus[ExitStatus["DiagnosticsPresent_OutputsGenerated"] = 2] = "DiagnosticsPresent_OutputsGenerated";
-    })(ExitStatus = ts.ExitStatus || (ts.ExitStatus = {}));
-    var UnionReduction;
-    (function (UnionReduction) {
-        UnionReduction[UnionReduction["None"] = 0] = "None";
-        UnionReduction[UnionReduction["Literal"] = 1] = "Literal";
-        UnionReduction[UnionReduction["Subtype"] = 2] = "Subtype";
-    })(UnionReduction = ts.UnionReduction || (ts.UnionReduction = {}));
-    var NodeBuilderFlags;
-    (function (NodeBuilderFlags) {
-        NodeBuilderFlags[NodeBuilderFlags["None"] = 0] = "None";
-        NodeBuilderFlags[NodeBuilderFlags["NoTruncation"] = 1] = "NoTruncation";
-        NodeBuilderFlags[NodeBuilderFlags["WriteArrayAsGenericType"] = 2] = "WriteArrayAsGenericType";
-        NodeBuilderFlags[NodeBuilderFlags["GenerateNamesForShadowedTypeParams"] = 4] = "GenerateNamesForShadowedTypeParams";
-        NodeBuilderFlags[NodeBuilderFlags["UseStructuralFallback"] = 8] = "UseStructuralFallback";
-        NodeBuilderFlags[NodeBuilderFlags["ForbidIndexedAccessSymbolReferences"] = 16] = "ForbidIndexedAccessSymbolReferences";
-        NodeBuilderFlags[NodeBuilderFlags["WriteTypeArgumentsOfSignature"] = 32] = "WriteTypeArgumentsOfSignature";
-        NodeBuilderFlags[NodeBuilderFlags["UseFullyQualifiedType"] = 64] = "UseFullyQualifiedType";
-        NodeBuilderFlags[NodeBuilderFlags["UseOnlyExternalAliasing"] = 128] = "UseOnlyExternalAliasing";
-        NodeBuilderFlags[NodeBuilderFlags["SuppressAnyReturnType"] = 256] = "SuppressAnyReturnType";
-        NodeBuilderFlags[NodeBuilderFlags["WriteTypeParametersInQualifiedName"] = 512] = "WriteTypeParametersInQualifiedName";
-        NodeBuilderFlags[NodeBuilderFlags["MultilineObjectLiterals"] = 1024] = "MultilineObjectLiterals";
-        NodeBuilderFlags[NodeBuilderFlags["WriteClassExpressionAsTypeLiteral"] = 2048] = "WriteClassExpressionAsTypeLiteral";
-        NodeBuilderFlags[NodeBuilderFlags["UseTypeOfFunction"] = 4096] = "UseTypeOfFunction";
-        NodeBuilderFlags[NodeBuilderFlags["OmitParameterModifiers"] = 8192] = "OmitParameterModifiers";
-        NodeBuilderFlags[NodeBuilderFlags["UseAliasDefinedOutsideCurrentScope"] = 16384] = "UseAliasDefinedOutsideCurrentScope";
-        NodeBuilderFlags[NodeBuilderFlags["AllowThisInObjectLiteral"] = 32768] = "AllowThisInObjectLiteral";
-        NodeBuilderFlags[NodeBuilderFlags["AllowQualifedNameInPlaceOfIdentifier"] = 65536] = "AllowQualifedNameInPlaceOfIdentifier";
-        NodeBuilderFlags[NodeBuilderFlags["AllowAnonymousIdentifier"] = 131072] = "AllowAnonymousIdentifier";
-        NodeBuilderFlags[NodeBuilderFlags["AllowEmptyUnionOrIntersection"] = 262144] = "AllowEmptyUnionOrIntersection";
-        NodeBuilderFlags[NodeBuilderFlags["AllowEmptyTuple"] = 524288] = "AllowEmptyTuple";
-        NodeBuilderFlags[NodeBuilderFlags["AllowUniqueESSymbolType"] = 1048576] = "AllowUniqueESSymbolType";
-        NodeBuilderFlags[NodeBuilderFlags["AllowEmptyIndexInfoType"] = 2097152] = "AllowEmptyIndexInfoType";
-        NodeBuilderFlags[NodeBuilderFlags["IgnoreErrors"] = 3112960] = "IgnoreErrors";
-        NodeBuilderFlags[NodeBuilderFlags["InObjectTypeLiteral"] = 4194304] = "InObjectTypeLiteral";
-        NodeBuilderFlags[NodeBuilderFlags["InTypeAlias"] = 8388608] = "InTypeAlias";
-        NodeBuilderFlags[NodeBuilderFlags["InInitialEntityName"] = 16777216] = "InInitialEntityName";
-        NodeBuilderFlags[NodeBuilderFlags["InReverseMappedType"] = 33554432] = "InReverseMappedType";
-    })(NodeBuilderFlags = ts.NodeBuilderFlags || (ts.NodeBuilderFlags = {}));
-    var TypeFormatFlags;
-    (function (TypeFormatFlags) {
-        TypeFormatFlags[TypeFormatFlags["None"] = 0] = "None";
-        TypeFormatFlags[TypeFormatFlags["NoTruncation"] = 1] = "NoTruncation";
-        TypeFormatFlags[TypeFormatFlags["WriteArrayAsGenericType"] = 2] = "WriteArrayAsGenericType";
-        TypeFormatFlags[TypeFormatFlags["UseStructuralFallback"] = 8] = "UseStructuralFallback";
-        TypeFormatFlags[TypeFormatFlags["WriteTypeArgumentsOfSignature"] = 32] = "WriteTypeArgumentsOfSignature";
-        TypeFormatFlags[TypeFormatFlags["UseFullyQualifiedType"] = 64] = "UseFullyQualifiedType";
-        TypeFormatFlags[TypeFormatFlags["SuppressAnyReturnType"] = 256] = "SuppressAnyReturnType";
-        TypeFormatFlags[TypeFormatFlags["MultilineObjectLiterals"] = 1024] = "MultilineObjectLiterals";
-        TypeFormatFlags[TypeFormatFlags["WriteClassExpressionAsTypeLiteral"] = 2048] = "WriteClassExpressionAsTypeLiteral";
-        TypeFormatFlags[TypeFormatFlags["UseTypeOfFunction"] = 4096] = "UseTypeOfFunction";
-        TypeFormatFlags[TypeFormatFlags["OmitParameterModifiers"] = 8192] = "OmitParameterModifiers";
-        TypeFormatFlags[TypeFormatFlags["UseAliasDefinedOutsideCurrentScope"] = 16384] = "UseAliasDefinedOutsideCurrentScope";
-        TypeFormatFlags[TypeFormatFlags["AllowUniqueESSymbolType"] = 1048576] = "AllowUniqueESSymbolType";
-        TypeFormatFlags[TypeFormatFlags["AddUndefined"] = 131072] = "AddUndefined";
-        TypeFormatFlags[TypeFormatFlags["WriteArrowStyleSignature"] = 262144] = "WriteArrowStyleSignature";
-        TypeFormatFlags[TypeFormatFlags["InArrayType"] = 524288] = "InArrayType";
-        TypeFormatFlags[TypeFormatFlags["InElementType"] = 2097152] = "InElementType";
-        TypeFormatFlags[TypeFormatFlags["InFirstTypeArgument"] = 4194304] = "InFirstTypeArgument";
-        TypeFormatFlags[TypeFormatFlags["InTypeAlias"] = 8388608] = "InTypeAlias";
-        TypeFormatFlags[TypeFormatFlags["WriteOwnNameForAnyLike"] = 0] = "WriteOwnNameForAnyLike";
-        TypeFormatFlags[TypeFormatFlags["NodeBuilderFlagsMask"] = 9469291] = "NodeBuilderFlagsMask";
-    })(TypeFormatFlags = ts.TypeFormatFlags || (ts.TypeFormatFlags = {}));
-    var SymbolFormatFlags;
-    (function (SymbolFormatFlags) {
-        SymbolFormatFlags[SymbolFormatFlags["None"] = 0] = "None";
-        SymbolFormatFlags[SymbolFormatFlags["WriteTypeParametersOrArguments"] = 1] = "WriteTypeParametersOrArguments";
-        SymbolFormatFlags[SymbolFormatFlags["UseOnlyExternalAliasing"] = 2] = "UseOnlyExternalAliasing";
-        SymbolFormatFlags[SymbolFormatFlags["AllowAnyNodeKind"] = 4] = "AllowAnyNodeKind";
-        SymbolFormatFlags[SymbolFormatFlags["UseAliasDefinedOutsideCurrentScope"] = 8] = "UseAliasDefinedOutsideCurrentScope";
-    })(SymbolFormatFlags = ts.SymbolFormatFlags || (ts.SymbolFormatFlags = {}));
-    var SymbolAccessibility;
-    (function (SymbolAccessibility) {
-        SymbolAccessibility[SymbolAccessibility["Accessible"] = 0] = "Accessible";
-        SymbolAccessibility[SymbolAccessibility["NotAccessible"] = 1] = "NotAccessible";
-        SymbolAccessibility[SymbolAccessibility["CannotBeNamed"] = 2] = "CannotBeNamed";
-    })(SymbolAccessibility = ts.SymbolAccessibility || (ts.SymbolAccessibility = {}));
-    var SyntheticSymbolKind;
-    (function (SyntheticSymbolKind) {
-        SyntheticSymbolKind[SyntheticSymbolKind["UnionOrIntersection"] = 0] = "UnionOrIntersection";
-        SyntheticSymbolKind[SyntheticSymbolKind["Spread"] = 1] = "Spread";
-    })(SyntheticSymbolKind = ts.SyntheticSymbolKind || (ts.SyntheticSymbolKind = {}));
-    var TypePredicateKind;
-    (function (TypePredicateKind) {
-        TypePredicateKind[TypePredicateKind["This"] = 0] = "This";
-        TypePredicateKind[TypePredicateKind["Identifier"] = 1] = "Identifier";
-    })(TypePredicateKind = ts.TypePredicateKind || (ts.TypePredicateKind = {}));
-    var TypeReferenceSerializationKind;
-    (function (TypeReferenceSerializationKind) {
-        TypeReferenceSerializationKind[TypeReferenceSerializationKind["Unknown"] = 0] = "Unknown";
-        TypeReferenceSerializationKind[TypeReferenceSerializationKind["TypeWithConstructSignatureAndValue"] = 1] = "TypeWithConstructSignatureAndValue";
-        TypeReferenceSerializationKind[TypeReferenceSerializationKind["VoidNullableOrNeverType"] = 2] = "VoidNullableOrNeverType";
-        TypeReferenceSerializationKind[TypeReferenceSerializationKind["NumberLikeType"] = 3] = "NumberLikeType";
-        TypeReferenceSerializationKind[TypeReferenceSerializationKind["StringLikeType"] = 4] = "StringLikeType";
-        TypeReferenceSerializationKind[TypeReferenceSerializationKind["BooleanType"] = 5] = "BooleanType";
-        TypeReferenceSerializationKind[TypeReferenceSerializationKind["ArrayLikeType"] = 6] = "ArrayLikeType";
-        TypeReferenceSerializationKind[TypeReferenceSerializationKind["ESSymbolType"] = 7] = "ESSymbolType";
-        TypeReferenceSerializationKind[TypeReferenceSerializationKind["Promise"] = 8] = "Promise";
-        TypeReferenceSerializationKind[TypeReferenceSerializationKind["TypeWithCallSignature"] = 9] = "TypeWithCallSignature";
-        TypeReferenceSerializationKind[TypeReferenceSerializationKind["ObjectType"] = 10] = "ObjectType";
-    })(TypeReferenceSerializationKind = ts.TypeReferenceSerializationKind || (ts.TypeReferenceSerializationKind = {}));
-    var SymbolFlags;
-    (function (SymbolFlags) {
-        SymbolFlags[SymbolFlags["None"] = 0] = "None";
-        SymbolFlags[SymbolFlags["FunctionScopedVariable"] = 1] = "FunctionScopedVariable";
-        SymbolFlags[SymbolFlags["BlockScopedVariable"] = 2] = "BlockScopedVariable";
-        SymbolFlags[SymbolFlags["Property"] = 4] = "Property";
-        SymbolFlags[SymbolFlags["EnumMember"] = 8] = "EnumMember";
-        SymbolFlags[SymbolFlags["Function"] = 16] = "Function";
-        SymbolFlags[SymbolFlags["Class"] = 32] = "Class";
-        SymbolFlags[SymbolFlags["Interface"] = 64] = "Interface";
-        SymbolFlags[SymbolFlags["ConstEnum"] = 128] = "ConstEnum";
-        SymbolFlags[SymbolFlags["RegularEnum"] = 256] = "RegularEnum";
-        SymbolFlags[SymbolFlags["ValueModule"] = 512] = "ValueModule";
-        SymbolFlags[SymbolFlags["NamespaceModule"] = 1024] = "NamespaceModule";
-        SymbolFlags[SymbolFlags["TypeLiteral"] = 2048] = "TypeLiteral";
-        SymbolFlags[SymbolFlags["ObjectLiteral"] = 4096] = "ObjectLiteral";
-        SymbolFlags[SymbolFlags["Method"] = 8192] = "Method";
-        SymbolFlags[SymbolFlags["Constructor"] = 16384] = "Constructor";
-        SymbolFlags[SymbolFlags["GetAccessor"] = 32768] = "GetAccessor";
-        SymbolFlags[SymbolFlags["SetAccessor"] = 65536] = "SetAccessor";
-        SymbolFlags[SymbolFlags["Signature"] = 131072] = "Signature";
-        SymbolFlags[SymbolFlags["TypeParameter"] = 262144] = "TypeParameter";
-        SymbolFlags[SymbolFlags["TypeAlias"] = 524288] = "TypeAlias";
-        SymbolFlags[SymbolFlags["ExportValue"] = 1048576] = "ExportValue";
-        SymbolFlags[SymbolFlags["Alias"] = 2097152] = "Alias";
-        SymbolFlags[SymbolFlags["Prototype"] = 4194304] = "Prototype";
-        SymbolFlags[SymbolFlags["ExportStar"] = 8388608] = "ExportStar";
-        SymbolFlags[SymbolFlags["Optional"] = 16777216] = "Optional";
-        SymbolFlags[SymbolFlags["Transient"] = 33554432] = "Transient";
-        SymbolFlags[SymbolFlags["JSContainer"] = 67108864] = "JSContainer";
-        SymbolFlags[SymbolFlags["All"] = 67108863] = "All";
-        SymbolFlags[SymbolFlags["Enum"] = 384] = "Enum";
-        SymbolFlags[SymbolFlags["Variable"] = 3] = "Variable";
-        SymbolFlags[SymbolFlags["Value"] = 67216319] = "Value";
-        SymbolFlags[SymbolFlags["Type"] = 67901928] = "Type";
-        SymbolFlags[SymbolFlags["Namespace"] = 1920] = "Namespace";
-        SymbolFlags[SymbolFlags["Module"] = 1536] = "Module";
-        SymbolFlags[SymbolFlags["Accessor"] = 98304] = "Accessor";
-        SymbolFlags[SymbolFlags["FunctionScopedVariableExcludes"] = 67216318] = "FunctionScopedVariableExcludes";
-        SymbolFlags[SymbolFlags["BlockScopedVariableExcludes"] = 67216319] = "BlockScopedVariableExcludes";
-        SymbolFlags[SymbolFlags["ParameterExcludes"] = 67216319] = "ParameterExcludes";
-        SymbolFlags[SymbolFlags["PropertyExcludes"] = 0] = "PropertyExcludes";
-        SymbolFlags[SymbolFlags["EnumMemberExcludes"] = 68008959] = "EnumMemberExcludes";
-        SymbolFlags[SymbolFlags["FunctionExcludes"] = 67215791] = "FunctionExcludes";
-        SymbolFlags[SymbolFlags["ClassExcludes"] = 68008383] = "ClassExcludes";
-        SymbolFlags[SymbolFlags["InterfaceExcludes"] = 67901832] = "InterfaceExcludes";
-        SymbolFlags[SymbolFlags["RegularEnumExcludes"] = 68008191] = "RegularEnumExcludes";
-        SymbolFlags[SymbolFlags["ConstEnumExcludes"] = 68008831] = "ConstEnumExcludes";
-        SymbolFlags[SymbolFlags["ValueModuleExcludes"] = 67215503] = "ValueModuleExcludes";
-        SymbolFlags[SymbolFlags["NamespaceModuleExcludes"] = 0] = "NamespaceModuleExcludes";
-        SymbolFlags[SymbolFlags["MethodExcludes"] = 67208127] = "MethodExcludes";
-        SymbolFlags[SymbolFlags["GetAccessorExcludes"] = 67150783] = "GetAccessorExcludes";
-        SymbolFlags[SymbolFlags["SetAccessorExcludes"] = 67183551] = "SetAccessorExcludes";
-        SymbolFlags[SymbolFlags["TypeParameterExcludes"] = 67639784] = "TypeParameterExcludes";
-        SymbolFlags[SymbolFlags["TypeAliasExcludes"] = 67901928] = "TypeAliasExcludes";
-        SymbolFlags[SymbolFlags["AliasExcludes"] = 2097152] = "AliasExcludes";
-        SymbolFlags[SymbolFlags["ModuleMember"] = 2623475] = "ModuleMember";
-        SymbolFlags[SymbolFlags["ExportHasLocal"] = 944] = "ExportHasLocal";
-        SymbolFlags[SymbolFlags["HasExports"] = 1952] = "HasExports";
-        SymbolFlags[SymbolFlags["HasMembers"] = 6240] = "HasMembers";
-        SymbolFlags[SymbolFlags["BlockScoped"] = 418] = "BlockScoped";
-        SymbolFlags[SymbolFlags["PropertyOrAccessor"] = 98308] = "PropertyOrAccessor";
-        SymbolFlags[SymbolFlags["ClassMember"] = 106500] = "ClassMember";
-        SymbolFlags[SymbolFlags["Classifiable"] = 2885600] = "Classifiable";
-        SymbolFlags[SymbolFlags["LateBindingContainer"] = 6240] = "LateBindingContainer";
-    })(SymbolFlags = ts.SymbolFlags || (ts.SymbolFlags = {}));
-    var EnumKind;
-    (function (EnumKind) {
-        EnumKind[EnumKind["Numeric"] = 0] = "Numeric";
-        EnumKind[EnumKind["Literal"] = 1] = "Literal";
-    })(EnumKind = ts.EnumKind || (ts.EnumKind = {}));
-    var CheckFlags;
-    (function (CheckFlags) {
-        CheckFlags[CheckFlags["Instantiated"] = 1] = "Instantiated";
-        CheckFlags[CheckFlags["SyntheticProperty"] = 2] = "SyntheticProperty";
-        CheckFlags[CheckFlags["SyntheticMethod"] = 4] = "SyntheticMethod";
-        CheckFlags[CheckFlags["Readonly"] = 8] = "Readonly";
-        CheckFlags[CheckFlags["Partial"] = 16] = "Partial";
-        CheckFlags[CheckFlags["HasNonUniformType"] = 32] = "HasNonUniformType";
-        CheckFlags[CheckFlags["ContainsPublic"] = 64] = "ContainsPublic";
-        CheckFlags[CheckFlags["ContainsProtected"] = 128] = "ContainsProtected";
-        CheckFlags[CheckFlags["ContainsPrivate"] = 256] = "ContainsPrivate";
-        CheckFlags[CheckFlags["ContainsStatic"] = 512] = "ContainsStatic";
-        CheckFlags[CheckFlags["Late"] = 1024] = "Late";
-        CheckFlags[CheckFlags["ReverseMapped"] = 2048] = "ReverseMapped";
-        CheckFlags[CheckFlags["Synthetic"] = 6] = "Synthetic";
-    })(CheckFlags = ts.CheckFlags || (ts.CheckFlags = {}));
-    var InternalSymbolName;
-    (function (InternalSymbolName) {
-        InternalSymbolName["Call"] = "__call";
-        InternalSymbolName["Constructor"] = "__constructor";
-        InternalSymbolName["New"] = "__new";
-        InternalSymbolName["Index"] = "__index";
-        InternalSymbolName["ExportStar"] = "__export";
-        InternalSymbolName["Global"] = "__global";
-        InternalSymbolName["Missing"] = "__missing";
-        InternalSymbolName["Type"] = "__type";
-        InternalSymbolName["Object"] = "__object";
-        InternalSymbolName["JSXAttributes"] = "__jsxAttributes";
-        InternalSymbolName["Class"] = "__class";
-        InternalSymbolName["Function"] = "__function";
-        InternalSymbolName["Computed"] = "__computed";
-        InternalSymbolName["Resolving"] = "__resolving__";
-        InternalSymbolName["ExportEquals"] = "export=";
-        InternalSymbolName["Default"] = "default";
-    })(InternalSymbolName = ts.InternalSymbolName || (ts.InternalSymbolName = {}));
-    var NodeCheckFlags;
-    (function (NodeCheckFlags) {
-        NodeCheckFlags[NodeCheckFlags["TypeChecked"] = 1] = "TypeChecked";
-        NodeCheckFlags[NodeCheckFlags["LexicalThis"] = 2] = "LexicalThis";
-        NodeCheckFlags[NodeCheckFlags["CaptureThis"] = 4] = "CaptureThis";
-        NodeCheckFlags[NodeCheckFlags["CaptureNewTarget"] = 8] = "CaptureNewTarget";
-        NodeCheckFlags[NodeCheckFlags["SuperInstance"] = 256] = "SuperInstance";
-        NodeCheckFlags[NodeCheckFlags["SuperStatic"] = 512] = "SuperStatic";
-        NodeCheckFlags[NodeCheckFlags["ContextChecked"] = 1024] = "ContextChecked";
-        NodeCheckFlags[NodeCheckFlags["AsyncMethodWithSuper"] = 2048] = "AsyncMethodWithSuper";
-        NodeCheckFlags[NodeCheckFlags["AsyncMethodWithSuperBinding"] = 4096] = "AsyncMethodWithSuperBinding";
-        NodeCheckFlags[NodeCheckFlags["CaptureArguments"] = 8192] = "CaptureArguments";
-        NodeCheckFlags[NodeCheckFlags["EnumValuesComputed"] = 16384] = "EnumValuesComputed";
-        NodeCheckFlags[NodeCheckFlags["LexicalModuleMergesWithClass"] = 32768] = "LexicalModuleMergesWithClass";
-        NodeCheckFlags[NodeCheckFlags["LoopWithCapturedBlockScopedBinding"] = 65536] = "LoopWithCapturedBlockScopedBinding";
-        NodeCheckFlags[NodeCheckFlags["CapturedBlockScopedBinding"] = 131072] = "CapturedBlockScopedBinding";
-        NodeCheckFlags[NodeCheckFlags["BlockScopedBindingInLoop"] = 262144] = "BlockScopedBindingInLoop";
-        NodeCheckFlags[NodeCheckFlags["ClassWithBodyScopedClassBinding"] = 524288] = "ClassWithBodyScopedClassBinding";
-        NodeCheckFlags[NodeCheckFlags["BodyScopedClassBinding"] = 1048576] = "BodyScopedClassBinding";
-        NodeCheckFlags[NodeCheckFlags["NeedsLoopOutParameter"] = 2097152] = "NeedsLoopOutParameter";
-        NodeCheckFlags[NodeCheckFlags["AssignmentsMarked"] = 4194304] = "AssignmentsMarked";
-        NodeCheckFlags[NodeCheckFlags["ClassWithConstructorReference"] = 8388608] = "ClassWithConstructorReference";
-        NodeCheckFlags[NodeCheckFlags["ConstructorReferenceInClass"] = 16777216] = "ConstructorReferenceInClass";
-    })(NodeCheckFlags = ts.NodeCheckFlags || (ts.NodeCheckFlags = {}));
-    var TypeFlags;
-    (function (TypeFlags) {
-        TypeFlags[TypeFlags["Any"] = 1] = "Any";
-        TypeFlags[TypeFlags["Unknown"] = 2] = "Unknown";
-        TypeFlags[TypeFlags["String"] = 4] = "String";
-        TypeFlags[TypeFlags["Number"] = 8] = "Number";
-        TypeFlags[TypeFlags["Boolean"] = 16] = "Boolean";
-        TypeFlags[TypeFlags["Enum"] = 32] = "Enum";
-        TypeFlags[TypeFlags["StringLiteral"] = 64] = "StringLiteral";
-        TypeFlags[TypeFlags["NumberLiteral"] = 128] = "NumberLiteral";
-        TypeFlags[TypeFlags["BooleanLiteral"] = 256] = "BooleanLiteral";
-        TypeFlags[TypeFlags["EnumLiteral"] = 512] = "EnumLiteral";
-        TypeFlags[TypeFlags["ESSymbol"] = 1024] = "ESSymbol";
-        TypeFlags[TypeFlags["UniqueESSymbol"] = 2048] = "UniqueESSymbol";
-        TypeFlags[TypeFlags["Void"] = 4096] = "Void";
-        TypeFlags[TypeFlags["Undefined"] = 8192] = "Undefined";
-        TypeFlags[TypeFlags["Null"] = 16384] = "Null";
-        TypeFlags[TypeFlags["Never"] = 32768] = "Never";
-        TypeFlags[TypeFlags["TypeParameter"] = 65536] = "TypeParameter";
-        TypeFlags[TypeFlags["Object"] = 131072] = "Object";
-        TypeFlags[TypeFlags["Union"] = 262144] = "Union";
-        TypeFlags[TypeFlags["Intersection"] = 524288] = "Intersection";
-        TypeFlags[TypeFlags["Index"] = 1048576] = "Index";
-        TypeFlags[TypeFlags["IndexedAccess"] = 2097152] = "IndexedAccess";
-        TypeFlags[TypeFlags["Conditional"] = 4194304] = "Conditional";
-        TypeFlags[TypeFlags["Substitution"] = 8388608] = "Substitution";
-        TypeFlags[TypeFlags["NonPrimitive"] = 16777216] = "NonPrimitive";
-        TypeFlags[TypeFlags["FreshLiteral"] = 33554432] = "FreshLiteral";
-        TypeFlags[TypeFlags["UnionOfUnitTypes"] = 67108864] = "UnionOfUnitTypes";
-        TypeFlags[TypeFlags["ContainsWideningType"] = 134217728] = "ContainsWideningType";
-        TypeFlags[TypeFlags["ContainsObjectLiteral"] = 268435456] = "ContainsObjectLiteral";
-        TypeFlags[TypeFlags["ContainsAnyFunctionType"] = 536870912] = "ContainsAnyFunctionType";
-        TypeFlags[TypeFlags["AnyOrUnknown"] = 3] = "AnyOrUnknown";
-        TypeFlags[TypeFlags["Nullable"] = 24576] = "Nullable";
-        TypeFlags[TypeFlags["Literal"] = 448] = "Literal";
-        TypeFlags[TypeFlags["Unit"] = 27072] = "Unit";
-        TypeFlags[TypeFlags["StringOrNumberLiteral"] = 192] = "StringOrNumberLiteral";
-        TypeFlags[TypeFlags["StringOrNumberLiteralOrUnique"] = 2240] = "StringOrNumberLiteralOrUnique";
-        TypeFlags[TypeFlags["DefinitelyFalsy"] = 29120] = "DefinitelyFalsy";
-        TypeFlags[TypeFlags["PossiblyFalsy"] = 29148] = "PossiblyFalsy";
-        TypeFlags[TypeFlags["Intrinsic"] = 16839967] = "Intrinsic";
-        TypeFlags[TypeFlags["Primitive"] = 32764] = "Primitive";
-        TypeFlags[TypeFlags["StringLike"] = 68] = "StringLike";
-        TypeFlags[TypeFlags["NumberLike"] = 168] = "NumberLike";
-        TypeFlags[TypeFlags["BooleanLike"] = 272] = "BooleanLike";
-        TypeFlags[TypeFlags["EnumLike"] = 544] = "EnumLike";
-        TypeFlags[TypeFlags["ESSymbolLike"] = 3072] = "ESSymbolLike";
-        TypeFlags[TypeFlags["VoidLike"] = 12288] = "VoidLike";
-        TypeFlags[TypeFlags["DisjointDomains"] = 16809468] = "DisjointDomains";
-        TypeFlags[TypeFlags["UnionOrIntersection"] = 786432] = "UnionOrIntersection";
-        TypeFlags[TypeFlags["StructuredType"] = 917504] = "StructuredType";
-        TypeFlags[TypeFlags["TypeVariable"] = 2162688] = "TypeVariable";
-        TypeFlags[TypeFlags["InstantiableNonPrimitive"] = 14745600] = "InstantiableNonPrimitive";
-        TypeFlags[TypeFlags["InstantiablePrimitive"] = 1048576] = "InstantiablePrimitive";
-        TypeFlags[TypeFlags["Instantiable"] = 15794176] = "Instantiable";
-        TypeFlags[TypeFlags["StructuredOrInstantiable"] = 16711680] = "StructuredOrInstantiable";
-        TypeFlags[TypeFlags["Narrowable"] = 33492479] = "Narrowable";
-        TypeFlags[TypeFlags["NotUnionOrUnit"] = 16909315] = "NotUnionOrUnit";
-        TypeFlags[TypeFlags["NotUnit"] = 16749629] = "NotUnit";
-        TypeFlags[TypeFlags["RequiresWidening"] = 402653184] = "RequiresWidening";
-        TypeFlags[TypeFlags["PropagatingFlags"] = 939524096] = "PropagatingFlags";
-        TypeFlags[TypeFlags["NonWideningType"] = 134217728] = "NonWideningType";
-        TypeFlags[TypeFlags["Wildcard"] = 268435456] = "Wildcard";
-        TypeFlags[TypeFlags["EmptyObject"] = 536870912] = "EmptyObject";
-        TypeFlags[TypeFlags["ConstructionFlags"] = 939524096] = "ConstructionFlags";
-        TypeFlags[TypeFlags["GenericMappedType"] = 134217728] = "GenericMappedType";
-    })(TypeFlags = ts.TypeFlags || (ts.TypeFlags = {}));
-    var ObjectFlags;
-    (function (ObjectFlags) {
-        ObjectFlags[ObjectFlags["Class"] = 1] = "Class";
-        ObjectFlags[ObjectFlags["Interface"] = 2] = "Interface";
-        ObjectFlags[ObjectFlags["Reference"] = 4] = "Reference";
-        ObjectFlags[ObjectFlags["Tuple"] = 8] = "Tuple";
-        ObjectFlags[ObjectFlags["Anonymous"] = 16] = "Anonymous";
-        ObjectFlags[ObjectFlags["Mapped"] = 32] = "Mapped";
-        ObjectFlags[ObjectFlags["Instantiated"] = 64] = "Instantiated";
-        ObjectFlags[ObjectFlags["ObjectLiteral"] = 128] = "ObjectLiteral";
-        ObjectFlags[ObjectFlags["EvolvingArray"] = 256] = "EvolvingArray";
-        ObjectFlags[ObjectFlags["ObjectLiteralPatternWithComputedProperties"] = 512] = "ObjectLiteralPatternWithComputedProperties";
-        ObjectFlags[ObjectFlags["ContainsSpread"] = 1024] = "ContainsSpread";
-        ObjectFlags[ObjectFlags["ReverseMapped"] = 2048] = "ReverseMapped";
-        ObjectFlags[ObjectFlags["JsxAttributes"] = 4096] = "JsxAttributes";
-        ObjectFlags[ObjectFlags["MarkerType"] = 8192] = "MarkerType";
-        ObjectFlags[ObjectFlags["ClassOrInterface"] = 3] = "ClassOrInterface";
-    })(ObjectFlags = ts.ObjectFlags || (ts.ObjectFlags = {}));
-    var Variance;
-    (function (Variance) {
-        Variance[Variance["Invariant"] = 0] = "Invariant";
-        Variance[Variance["Covariant"] = 1] = "Covariant";
-        Variance[Variance["Contravariant"] = 2] = "Contravariant";
-        Variance[Variance["Bivariant"] = 3] = "Bivariant";
-        Variance[Variance["Independent"] = 4] = "Independent";
-    })(Variance = ts.Variance || (ts.Variance = {}));
-    var SignatureKind;
-    (function (SignatureKind) {
-        SignatureKind[SignatureKind["Call"] = 0] = "Call";
-        SignatureKind[SignatureKind["Construct"] = 1] = "Construct";
-    })(SignatureKind = ts.SignatureKind || (ts.SignatureKind = {}));
-    var IndexKind;
-    (function (IndexKind) {
-        IndexKind[IndexKind["String"] = 0] = "String";
-        IndexKind[IndexKind["Number"] = 1] = "Number";
-    })(IndexKind = ts.IndexKind || (ts.IndexKind = {}));
-    var InferencePriority;
-    (function (InferencePriority) {
-        InferencePriority[InferencePriority["NakedTypeVariable"] = 1] = "NakedTypeVariable";
-        InferencePriority[InferencePriority["HomomorphicMappedType"] = 2] = "HomomorphicMappedType";
-        InferencePriority[InferencePriority["MappedTypeConstraint"] = 4] = "MappedTypeConstraint";
-        InferencePriority[InferencePriority["ReturnType"] = 8] = "ReturnType";
-        InferencePriority[InferencePriority["LiteralKeyof"] = 16] = "LiteralKeyof";
-        InferencePriority[InferencePriority["NoConstraints"] = 32] = "NoConstraints";
-        InferencePriority[InferencePriority["AlwaysStrict"] = 64] = "AlwaysStrict";
-        InferencePriority[InferencePriority["PriorityImpliesCombination"] = 28] = "PriorityImpliesCombination";
-    })(InferencePriority = ts.InferencePriority || (ts.InferencePriority = {}));
-    var InferenceFlags;
-    (function (InferenceFlags) {
-        InferenceFlags[InferenceFlags["None"] = 0] = "None";
-        InferenceFlags[InferenceFlags["InferUnionTypes"] = 1] = "InferUnionTypes";
-        InferenceFlags[InferenceFlags["NoDefault"] = 2] = "NoDefault";
-        InferenceFlags[InferenceFlags["AnyDefault"] = 4] = "AnyDefault";
-    })(InferenceFlags = ts.InferenceFlags || (ts.InferenceFlags = {}));
-    var Ternary;
-    (function (Ternary) {
-        Ternary[Ternary["False"] = 0] = "False";
-        Ternary[Ternary["Maybe"] = 1] = "Maybe";
-        Ternary[Ternary["True"] = -1] = "True";
-    })(Ternary = ts.Ternary || (ts.Ternary = {}));
-    var SpecialPropertyAssignmentKind;
-    (function (SpecialPropertyAssignmentKind) {
-        SpecialPropertyAssignmentKind[SpecialPropertyAssignmentKind["None"] = 0] = "None";
-        SpecialPropertyAssignmentKind[SpecialPropertyAssignmentKind["ExportsProperty"] = 1] = "ExportsProperty";
-        SpecialPropertyAssignmentKind[SpecialPropertyAssignmentKind["ModuleExports"] = 2] = "ModuleExports";
-        SpecialPropertyAssignmentKind[SpecialPropertyAssignmentKind["PrototypeProperty"] = 3] = "PrototypeProperty";
-        SpecialPropertyAssignmentKind[SpecialPropertyAssignmentKind["ThisProperty"] = 4] = "ThisProperty";
-        SpecialPropertyAssignmentKind[SpecialPropertyAssignmentKind["Property"] = 5] = "Property";
-        SpecialPropertyAssignmentKind[SpecialPropertyAssignmentKind["Prototype"] = 6] = "Prototype";
-    })(SpecialPropertyAssignmentKind = ts.SpecialPropertyAssignmentKind || (ts.SpecialPropertyAssignmentKind = {}));
-    var DiagnosticCategory;
-    (function (DiagnosticCategory) {
-        DiagnosticCategory[DiagnosticCategory["Warning"] = 0] = "Warning";
-        DiagnosticCategory[DiagnosticCategory["Error"] = 1] = "Error";
-        DiagnosticCategory[DiagnosticCategory["Suggestion"] = 2] = "Suggestion";
-        DiagnosticCategory[DiagnosticCategory["Message"] = 3] = "Message";
-    })(DiagnosticCategory = ts.DiagnosticCategory || (ts.DiagnosticCategory = {}));
-    function diagnosticCategoryName(d, lowerCase) {
-        if (lowerCase === void 0) { lowerCase = true; }
-        var name = DiagnosticCategory[d.category];
-        return lowerCase ? name.toLowerCase() : name;
-    }
-    ts.diagnosticCategoryName = diagnosticCategoryName;
-    var ModuleResolutionKind;
-    (function (ModuleResolutionKind) {
-        ModuleResolutionKind[ModuleResolutionKind["Classic"] = 1] = "Classic";
-        ModuleResolutionKind[ModuleResolutionKind["NodeJs"] = 2] = "NodeJs";
-    })(ModuleResolutionKind = ts.ModuleResolutionKind || (ts.ModuleResolutionKind = {}));
-    var ModuleKind;
-    (function (ModuleKind) {
-        ModuleKind[ModuleKind["None"] = 0] = "None";
-        ModuleKind[ModuleKind["CommonJS"] = 1] = "CommonJS";
-        ModuleKind[ModuleKind["AMD"] = 2] = "AMD";
-        ModuleKind[ModuleKind["UMD"] = 3] = "UMD";
-        ModuleKind[ModuleKind["System"] = 4] = "System";
-        ModuleKind[ModuleKind["ES2015"] = 5] = "ES2015";
-        ModuleKind[ModuleKind["ESNext"] = 6] = "ESNext";
-    })(ModuleKind = ts.ModuleKind || (ts.ModuleKind = {}));
-    var JsxEmit;
-    (function (JsxEmit) {
-        JsxEmit[JsxEmit["None"] = 0] = "None";
-        JsxEmit[JsxEmit["Preserve"] = 1] = "Preserve";
-        JsxEmit[JsxEmit["React"] = 2] = "React";
-        JsxEmit[JsxEmit["ReactNative"] = 3] = "ReactNative";
-    })(JsxEmit = ts.JsxEmit || (ts.JsxEmit = {}));
-    var NewLineKind;
-    (function (NewLineKind) {
-        NewLineKind[NewLineKind["CarriageReturnLineFeed"] = 0] = "CarriageReturnLineFeed";
-        NewLineKind[NewLineKind["LineFeed"] = 1] = "LineFeed";
-    })(NewLineKind = ts.NewLineKind || (ts.NewLineKind = {}));
-    var ScriptKind;
-    (function (ScriptKind) {
-        ScriptKind[ScriptKind["Unknown"] = 0] = "Unknown";
-        ScriptKind[ScriptKind["JS"] = 1] = "JS";
-        ScriptKind[ScriptKind["JSX"] = 2] = "JSX";
-        ScriptKind[ScriptKind["TS"] = 3] = "TS";
-        ScriptKind[ScriptKind["TSX"] = 4] = "TSX";
-        ScriptKind[ScriptKind["External"] = 5] = "External";
-        ScriptKind[ScriptKind["JSON"] = 6] = "JSON";
-        ScriptKind[ScriptKind["Deferred"] = 7] = "Deferred";
-    })(ScriptKind = ts.ScriptKind || (ts.ScriptKind = {}));
-    var ScriptTarget;
-    (function (ScriptTarget) {
-        ScriptTarget[ScriptTarget["ES3"] = 0] = "ES3";
-        ScriptTarget[ScriptTarget["ES5"] = 1] = "ES5";
-        ScriptTarget[ScriptTarget["ES2015"] = 2] = "ES2015";
-        ScriptTarget[ScriptTarget["ES2016"] = 3] = "ES2016";
-        ScriptTarget[ScriptTarget["ES2017"] = 4] = "ES2017";
-        ScriptTarget[ScriptTarget["ES2018"] = 5] = "ES2018";
-        ScriptTarget[ScriptTarget["ESNext"] = 6] = "ESNext";
-        ScriptTarget[ScriptTarget["JSON"] = 100] = "JSON";
-        ScriptTarget[ScriptTarget["Latest"] = 6] = "Latest";
-    })(ScriptTarget = ts.ScriptTarget || (ts.ScriptTarget = {}));
-    var LanguageVariant;
-    (function (LanguageVariant) {
-        LanguageVariant[LanguageVariant["Standard"] = 0] = "Standard";
-        LanguageVariant[LanguageVariant["JSX"] = 1] = "JSX";
-    })(LanguageVariant = ts.LanguageVariant || (ts.LanguageVariant = {}));
-    var WatchDirectoryFlags;
-    (function (WatchDirectoryFlags) {
-        WatchDirectoryFlags[WatchDirectoryFlags["None"] = 0] = "None";
-        WatchDirectoryFlags[WatchDirectoryFlags["Recursive"] = 1] = "Recursive";
-    })(WatchDirectoryFlags = ts.WatchDirectoryFlags || (ts.WatchDirectoryFlags = {}));
-    var CharacterCodes;
-    (function (CharacterCodes) {
-        CharacterCodes[CharacterCodes["nullCharacter"] = 0] = "nullCharacter";
-        CharacterCodes[CharacterCodes["maxAsciiCharacter"] = 127] = "maxAsciiCharacter";
-        CharacterCodes[CharacterCodes["lineFeed"] = 10] = "lineFeed";
-        CharacterCodes[CharacterCodes["carriageReturn"] = 13] = "carriageReturn";
-        CharacterCodes[CharacterCodes["lineSeparator"] = 8232] = "lineSeparator";
-        CharacterCodes[CharacterCodes["paragraphSeparator"] = 8233] = "paragraphSeparator";
-        CharacterCodes[CharacterCodes["nextLine"] = 133] = "nextLine";
-        CharacterCodes[CharacterCodes["space"] = 32] = "space";
-        CharacterCodes[CharacterCodes["nonBreakingSpace"] = 160] = "nonBreakingSpace";
-        CharacterCodes[CharacterCodes["enQuad"] = 8192] = "enQuad";
-        CharacterCodes[CharacterCodes["emQuad"] = 8193] = "emQuad";
-        CharacterCodes[CharacterCodes["enSpace"] = 8194] = "enSpace";
-        CharacterCodes[CharacterCodes["emSpace"] = 8195] = "emSpace";
-        CharacterCodes[CharacterCodes["threePerEmSpace"] = 8196] = "threePerEmSpace";
-        CharacterCodes[CharacterCodes["fourPerEmSpace"] = 8197] = "fourPerEmSpace";
-        CharacterCodes[CharacterCodes["sixPerEmSpace"] = 8198] = "sixPerEmSpace";
-        CharacterCodes[CharacterCodes["figureSpace"] = 8199] = "figureSpace";
-        CharacterCodes[CharacterCodes["punctuationSpace"] = 8200] = "punctuationSpace";
-        CharacterCodes[CharacterCodes["thinSpace"] = 8201] = "thinSpace";
-        CharacterCodes[CharacterCodes["hairSpace"] = 8202] = "hairSpace";
-        CharacterCodes[CharacterCodes["zeroWidthSpace"] = 8203] = "zeroWidthSpace";
-        CharacterCodes[CharacterCodes["narrowNoBreakSpace"] = 8239] = "narrowNoBreakSpace";
-        CharacterCodes[CharacterCodes["ideographicSpace"] = 12288] = "ideographicSpace";
-        CharacterCodes[CharacterCodes["mathematicalSpace"] = 8287] = "mathematicalSpace";
-        CharacterCodes[CharacterCodes["ogham"] = 5760] = "ogham";
-        CharacterCodes[CharacterCodes["_"] = 95] = "_";
-        CharacterCodes[CharacterCodes["$"] = 36] = "$";
-        CharacterCodes[CharacterCodes["_0"] = 48] = "_0";
-        CharacterCodes[CharacterCodes["_1"] = 49] = "_1";
-        CharacterCodes[CharacterCodes["_2"] = 50] = "_2";
-        CharacterCodes[CharacterCodes["_3"] = 51] = "_3";
-        CharacterCodes[CharacterCodes["_4"] = 52] = "_4";
-        CharacterCodes[CharacterCodes["_5"] = 53] = "_5";
-        CharacterCodes[CharacterCodes["_6"] = 54] = "_6";
-        CharacterCodes[CharacterCodes["_7"] = 55] = "_7";
-        CharacterCodes[CharacterCodes["_8"] = 56] = "_8";
-        CharacterCodes[CharacterCodes["_9"] = 57] = "_9";
-        CharacterCodes[CharacterCodes["a"] = 97] = "a";
-        CharacterCodes[CharacterCodes["b"] = 98] = "b";
-        CharacterCodes[CharacterCodes["c"] = 99] = "c";
-        CharacterCodes[CharacterCodes["d"] = 100] = "d";
-        CharacterCodes[CharacterCodes["e"] = 101] = "e";
-        CharacterCodes[CharacterCodes["f"] = 102] = "f";
-        CharacterCodes[CharacterCodes["g"] = 103] = "g";
-        CharacterCodes[CharacterCodes["h"] = 104] = "h";
-        CharacterCodes[CharacterCodes["i"] = 105] = "i";
-        CharacterCodes[CharacterCodes["j"] = 106] = "j";
-        CharacterCodes[CharacterCodes["k"] = 107] = "k";
-        CharacterCodes[CharacterCodes["l"] = 108] = "l";
-        CharacterCodes[CharacterCodes["m"] = 109] = "m";
-        CharacterCodes[CharacterCodes["n"] = 110] = "n";
-        CharacterCodes[CharacterCodes["o"] = 111] = "o";
-        CharacterCodes[CharacterCodes["p"] = 112] = "p";
-        CharacterCodes[CharacterCodes["q"] = 113] = "q";
-        CharacterCodes[CharacterCodes["r"] = 114] = "r";
-        CharacterCodes[CharacterCodes["s"] = 115] = "s";
-        CharacterCodes[CharacterCodes["t"] = 116] = "t";
-        CharacterCodes[CharacterCodes["u"] = 117] = "u";
-        CharacterCodes[CharacterCodes["v"] = 118] = "v";
-        CharacterCodes[CharacterCodes["w"] = 119] = "w";
-        CharacterCodes[CharacterCodes["x"] = 120] = "x";
-        CharacterCodes[CharacterCodes["y"] = 121] = "y";
-        CharacterCodes[CharacterCodes["z"] = 122] = "z";
-        CharacterCodes[CharacterCodes["A"] = 65] = "A";
-        CharacterCodes[CharacterCodes["B"] = 66] = "B";
-        CharacterCodes[CharacterCodes["C"] = 67] = "C";
-        CharacterCodes[CharacterCodes["D"] = 68] = "D";
-        CharacterCodes[CharacterCodes["E"] = 69] = "E";
-        CharacterCodes[CharacterCodes["F"] = 70] = "F";
-        CharacterCodes[CharacterCodes["G"] = 71] = "G";
-        CharacterCodes[CharacterCodes["H"] = 72] = "H";
-        CharacterCodes[CharacterCodes["I"] = 73] = "I";
-        CharacterCodes[CharacterCodes["J"] = 74] = "J";
-        CharacterCodes[CharacterCodes["K"] = 75] = "K";
-        CharacterCodes[CharacterCodes["L"] = 76] = "L";
-        CharacterCodes[CharacterCodes["M"] = 77] = "M";
-        CharacterCodes[CharacterCodes["N"] = 78] = "N";
-        CharacterCodes[CharacterCodes["O"] = 79] = "O";
-        CharacterCodes[CharacterCodes["P"] = 80] = "P";
-        CharacterCodes[CharacterCodes["Q"] = 81] = "Q";
-        CharacterCodes[CharacterCodes["R"] = 82] = "R";
-        CharacterCodes[CharacterCodes["S"] = 83] = "S";
-        CharacterCodes[CharacterCodes["T"] = 84] = "T";
-        CharacterCodes[CharacterCodes["U"] = 85] = "U";
-        CharacterCodes[CharacterCodes["V"] = 86] = "V";
-        CharacterCodes[CharacterCodes["W"] = 87] = "W";
-        CharacterCodes[CharacterCodes["X"] = 88] = "X";
-        CharacterCodes[CharacterCodes["Y"] = 89] = "Y";
-        CharacterCodes[CharacterCodes["Z"] = 90] = "Z";
-        CharacterCodes[CharacterCodes["ampersand"] = 38] = "ampersand";
-        CharacterCodes[CharacterCodes["asterisk"] = 42] = "asterisk";
-        CharacterCodes[CharacterCodes["at"] = 64] = "at";
-        CharacterCodes[CharacterCodes["backslash"] = 92] = "backslash";
-        CharacterCodes[CharacterCodes["backtick"] = 96] = "backtick";
-        CharacterCodes[CharacterCodes["bar"] = 124] = "bar";
-        CharacterCodes[CharacterCodes["caret"] = 94] = "caret";
-        CharacterCodes[CharacterCodes["closeBrace"] = 125] = "closeBrace";
-        CharacterCodes[CharacterCodes["closeBracket"] = 93] = "closeBracket";
-        CharacterCodes[CharacterCodes["closeParen"] = 41] = "closeParen";
-        CharacterCodes[CharacterCodes["colon"] = 58] = "colon";
-        CharacterCodes[CharacterCodes["comma"] = 44] = "comma";
-        CharacterCodes[CharacterCodes["dot"] = 46] = "dot";
-        CharacterCodes[CharacterCodes["doubleQuote"] = 34] = "doubleQuote";
-        CharacterCodes[CharacterCodes["equals"] = 61] = "equals";
-        CharacterCodes[CharacterCodes["exclamation"] = 33] = "exclamation";
-        CharacterCodes[CharacterCodes["greaterThan"] = 62] = "greaterThan";
-        CharacterCodes[CharacterCodes["hash"] = 35] = "hash";
-        CharacterCodes[CharacterCodes["lessThan"] = 60] = "lessThan";
-        CharacterCodes[CharacterCodes["minus"] = 45] = "minus";
-        CharacterCodes[CharacterCodes["openBrace"] = 123] = "openBrace";
-        CharacterCodes[CharacterCodes["openBracket"] = 91] = "openBracket";
-        CharacterCodes[CharacterCodes["openParen"] = 40] = "openParen";
-        CharacterCodes[CharacterCodes["percent"] = 37] = "percent";
-        CharacterCodes[CharacterCodes["plus"] = 43] = "plus";
-        CharacterCodes[CharacterCodes["question"] = 63] = "question";
-        CharacterCodes[CharacterCodes["semicolon"] = 59] = "semicolon";
-        CharacterCodes[CharacterCodes["singleQuote"] = 39] = "singleQuote";
-        CharacterCodes[CharacterCodes["slash"] = 47] = "slash";
-        CharacterCodes[CharacterCodes["tilde"] = 126] = "tilde";
-        CharacterCodes[CharacterCodes["backspace"] = 8] = "backspace";
-        CharacterCodes[CharacterCodes["formFeed"] = 12] = "formFeed";
-        CharacterCodes[CharacterCodes["byteOrderMark"] = 65279] = "byteOrderMark";
-        CharacterCodes[CharacterCodes["tab"] = 9] = "tab";
-        CharacterCodes[CharacterCodes["verticalTab"] = 11] = "verticalTab";
-    })(CharacterCodes = ts.CharacterCodes || (ts.CharacterCodes = {}));
-    var Extension;
-    (function (Extension) {
-        Extension["Ts"] = ".ts";
-        Extension["Tsx"] = ".tsx";
-        Extension["Dts"] = ".d.ts";
-        Extension["Js"] = ".js";
-        Extension["Jsx"] = ".jsx";
-        Extension["Json"] = ".json";
-    })(Extension = ts.Extension || (ts.Extension = {}));
-    var TransformFlags;
-    (function (TransformFlags) {
-        TransformFlags[TransformFlags["None"] = 0] = "None";
-        TransformFlags[TransformFlags["TypeScript"] = 1] = "TypeScript";
-        TransformFlags[TransformFlags["ContainsTypeScript"] = 2] = "ContainsTypeScript";
-        TransformFlags[TransformFlags["ContainsJsx"] = 4] = "ContainsJsx";
-        TransformFlags[TransformFlags["ContainsESNext"] = 8] = "ContainsESNext";
-        TransformFlags[TransformFlags["ContainsES2017"] = 16] = "ContainsES2017";
-        TransformFlags[TransformFlags["ContainsES2016"] = 32] = "ContainsES2016";
-        TransformFlags[TransformFlags["ES2015"] = 64] = "ES2015";
-        TransformFlags[TransformFlags["ContainsES2015"] = 128] = "ContainsES2015";
-        TransformFlags[TransformFlags["Generator"] = 256] = "Generator";
-        TransformFlags[TransformFlags["ContainsGenerator"] = 512] = "ContainsGenerator";
-        TransformFlags[TransformFlags["DestructuringAssignment"] = 1024] = "DestructuringAssignment";
-        TransformFlags[TransformFlags["ContainsDestructuringAssignment"] = 2048] = "ContainsDestructuringAssignment";
-        TransformFlags[TransformFlags["ContainsDecorators"] = 4096] = "ContainsDecorators";
-        TransformFlags[TransformFlags["ContainsPropertyInitializer"] = 8192] = "ContainsPropertyInitializer";
-        TransformFlags[TransformFlags["ContainsLexicalThis"] = 16384] = "ContainsLexicalThis";
-        TransformFlags[TransformFlags["ContainsCapturedLexicalThis"] = 32768] = "ContainsCapturedLexicalThis";
-        TransformFlags[TransformFlags["ContainsLexicalThisInComputedPropertyName"] = 65536] = "ContainsLexicalThisInComputedPropertyName";
-        TransformFlags[TransformFlags["ContainsDefaultValueAssignments"] = 131072] = "ContainsDefaultValueAssignments";
-        TransformFlags[TransformFlags["ContainsParameterPropertyAssignments"] = 262144] = "ContainsParameterPropertyAssignments";
-        TransformFlags[TransformFlags["ContainsSpread"] = 524288] = "ContainsSpread";
-        TransformFlags[TransformFlags["ContainsObjectSpread"] = 1048576] = "ContainsObjectSpread";
-        TransformFlags[TransformFlags["ContainsRest"] = 524288] = "ContainsRest";
-        TransformFlags[TransformFlags["ContainsObjectRest"] = 1048576] = "ContainsObjectRest";
-        TransformFlags[TransformFlags["ContainsComputedPropertyName"] = 2097152] = "ContainsComputedPropertyName";
-        TransformFlags[TransformFlags["ContainsBlockScopedBinding"] = 4194304] = "ContainsBlockScopedBinding";
-        TransformFlags[TransformFlags["ContainsBindingPattern"] = 8388608] = "ContainsBindingPattern";
-        TransformFlags[TransformFlags["ContainsYield"] = 16777216] = "ContainsYield";
-        TransformFlags[TransformFlags["ContainsHoistedDeclarationOrCompletion"] = 33554432] = "ContainsHoistedDeclarationOrCompletion";
-        TransformFlags[TransformFlags["ContainsDynamicImport"] = 67108864] = "ContainsDynamicImport";
-        TransformFlags[TransformFlags["Super"] = 134217728] = "Super";
-        TransformFlags[TransformFlags["ContainsSuper"] = 268435456] = "ContainsSuper";
-        TransformFlags[TransformFlags["HasComputedFlags"] = 536870912] = "HasComputedFlags";
-        TransformFlags[TransformFlags["AssertTypeScript"] = 3] = "AssertTypeScript";
-        TransformFlags[TransformFlags["AssertJsx"] = 4] = "AssertJsx";
-        TransformFlags[TransformFlags["AssertESNext"] = 8] = "AssertESNext";
-        TransformFlags[TransformFlags["AssertES2017"] = 16] = "AssertES2017";
-        TransformFlags[TransformFlags["AssertES2016"] = 32] = "AssertES2016";
-        TransformFlags[TransformFlags["AssertES2015"] = 192] = "AssertES2015";
-        TransformFlags[TransformFlags["AssertGenerator"] = 768] = "AssertGenerator";
-        TransformFlags[TransformFlags["AssertDestructuringAssignment"] = 3072] = "AssertDestructuringAssignment";
-        TransformFlags[TransformFlags["OuterExpressionExcludes"] = 536872257] = "OuterExpressionExcludes";
-        TransformFlags[TransformFlags["PropertyAccessExcludes"] = 671089985] = "PropertyAccessExcludes";
-        TransformFlags[TransformFlags["NodeExcludes"] = 939525441] = "NodeExcludes";
-        TransformFlags[TransformFlags["ArrowFunctionExcludes"] = 1003902273] = "ArrowFunctionExcludes";
-        TransformFlags[TransformFlags["FunctionExcludes"] = 1003935041] = "FunctionExcludes";
-        TransformFlags[TransformFlags["ConstructorExcludes"] = 1003668801] = "ConstructorExcludes";
-        TransformFlags[TransformFlags["MethodOrAccessorExcludes"] = 1003668801] = "MethodOrAccessorExcludes";
-        TransformFlags[TransformFlags["ClassExcludes"] = 942011713] = "ClassExcludes";
-        TransformFlags[TransformFlags["ModuleExcludes"] = 977327425] = "ModuleExcludes";
-        TransformFlags[TransformFlags["TypeExcludes"] = -3] = "TypeExcludes";
-        TransformFlags[TransformFlags["ObjectLiteralExcludes"] = 942740801] = "ObjectLiteralExcludes";
-        TransformFlags[TransformFlags["ArrayLiteralOrCallOrNewExcludes"] = 940049729] = "ArrayLiteralOrCallOrNewExcludes";
-        TransformFlags[TransformFlags["VariableDeclarationListExcludes"] = 948962625] = "VariableDeclarationListExcludes";
-        TransformFlags[TransformFlags["ParameterExcludes"] = 939525441] = "ParameterExcludes";
-        TransformFlags[TransformFlags["CatchClauseExcludes"] = 940574017] = "CatchClauseExcludes";
-        TransformFlags[TransformFlags["BindingPatternExcludes"] = 940049729] = "BindingPatternExcludes";
-        TransformFlags[TransformFlags["TypeScriptClassSyntaxMask"] = 274432] = "TypeScriptClassSyntaxMask";
-        TransformFlags[TransformFlags["ES2015FunctionSyntaxMask"] = 163840] = "ES2015FunctionSyntaxMask";
-    })(TransformFlags = ts.TransformFlags || (ts.TransformFlags = {}));
-    var EmitFlags;
-    (function (EmitFlags) {
-        EmitFlags[EmitFlags["None"] = 0] = "None";
-        EmitFlags[EmitFlags["SingleLine"] = 1] = "SingleLine";
-        EmitFlags[EmitFlags["AdviseOnEmitNode"] = 2] = "AdviseOnEmitNode";
-        EmitFlags[EmitFlags["NoSubstitution"] = 4] = "NoSubstitution";
-        EmitFlags[EmitFlags["CapturesThis"] = 8] = "CapturesThis";
-        EmitFlags[EmitFlags["NoLeadingSourceMap"] = 16] = "NoLeadingSourceMap";
-        EmitFlags[EmitFlags["NoTrailingSourceMap"] = 32] = "NoTrailingSourceMap";
-        EmitFlags[EmitFlags["NoSourceMap"] = 48] = "NoSourceMap";
-        EmitFlags[EmitFlags["NoNestedSourceMaps"] = 64] = "NoNestedSourceMaps";
-        EmitFlags[EmitFlags["NoTokenLeadingSourceMaps"] = 128] = "NoTokenLeadingSourceMaps";
-        EmitFlags[EmitFlags["NoTokenTrailingSourceMaps"] = 256] = "NoTokenTrailingSourceMaps";
-        EmitFlags[EmitFlags["NoTokenSourceMaps"] = 384] = "NoTokenSourceMaps";
-        EmitFlags[EmitFlags["NoLeadingComments"] = 512] = "NoLeadingComments";
-        EmitFlags[EmitFlags["NoTrailingComments"] = 1024] = "NoTrailingComments";
-        EmitFlags[EmitFlags["NoComments"] = 1536] = "NoComments";
-        EmitFlags[EmitFlags["NoNestedComments"] = 2048] = "NoNestedComments";
-        EmitFlags[EmitFlags["HelperName"] = 4096] = "HelperName";
-        EmitFlags[EmitFlags["ExportName"] = 8192] = "ExportName";
-        EmitFlags[EmitFlags["LocalName"] = 16384] = "LocalName";
-        EmitFlags[EmitFlags["InternalName"] = 32768] = "InternalName";
-        EmitFlags[EmitFlags["Indented"] = 65536] = "Indented";
-        EmitFlags[EmitFlags["NoIndentation"] = 131072] = "NoIndentation";
-        EmitFlags[EmitFlags["AsyncFunctionBody"] = 262144] = "AsyncFunctionBody";
-        EmitFlags[EmitFlags["ReuseTempVariableScope"] = 524288] = "ReuseTempVariableScope";
-        EmitFlags[EmitFlags["CustomPrologue"] = 1048576] = "CustomPrologue";
-        EmitFlags[EmitFlags["NoHoisting"] = 2097152] = "NoHoisting";
-        EmitFlags[EmitFlags["HasEndOfDeclarationMarker"] = 4194304] = "HasEndOfDeclarationMarker";
-        EmitFlags[EmitFlags["Iterator"] = 8388608] = "Iterator";
-        EmitFlags[EmitFlags["NoAsciiEscaping"] = 16777216] = "NoAsciiEscaping";
-        EmitFlags[EmitFlags["TypeScriptClassWrapper"] = 33554432] = "TypeScriptClassWrapper";
-        EmitFlags[EmitFlags["NeverApplyImportHelper"] = 67108864] = "NeverApplyImportHelper";
-    })(EmitFlags = ts.EmitFlags || (ts.EmitFlags = {}));
-    var ExternalEmitHelpers;
-    (function (ExternalEmitHelpers) {
-        ExternalEmitHelpers[ExternalEmitHelpers["Extends"] = 1] = "Extends";
-        ExternalEmitHelpers[ExternalEmitHelpers["Assign"] = 2] = "Assign";
-        ExternalEmitHelpers[ExternalEmitHelpers["Rest"] = 4] = "Rest";
-        ExternalEmitHelpers[ExternalEmitHelpers["Decorate"] = 8] = "Decorate";
-        ExternalEmitHelpers[ExternalEmitHelpers["Metadata"] = 16] = "Metadata";
-        ExternalEmitHelpers[ExternalEmitHelpers["Param"] = 32] = "Param";
-        ExternalEmitHelpers[ExternalEmitHelpers["Awaiter"] = 64] = "Awaiter";
-        ExternalEmitHelpers[ExternalEmitHelpers["Generator"] = 128] = "Generator";
-        ExternalEmitHelpers[ExternalEmitHelpers["Values"] = 256] = "Values";
-        ExternalEmitHelpers[ExternalEmitHelpers["Read"] = 512] = "Read";
-        ExternalEmitHelpers[ExternalEmitHelpers["Spread"] = 1024] = "Spread";
-        ExternalEmitHelpers[ExternalEmitHelpers["Await"] = 2048] = "Await";
-        ExternalEmitHelpers[ExternalEmitHelpers["AsyncGenerator"] = 4096] = "AsyncGenerator";
-        ExternalEmitHelpers[ExternalEmitHelpers["AsyncDelegator"] = 8192] = "AsyncDelegator";
-        ExternalEmitHelpers[ExternalEmitHelpers["AsyncValues"] = 16384] = "AsyncValues";
-        ExternalEmitHelpers[ExternalEmitHelpers["ExportStar"] = 32768] = "ExportStar";
-        ExternalEmitHelpers[ExternalEmitHelpers["MakeTemplateObject"] = 65536] = "MakeTemplateObject";
-        ExternalEmitHelpers[ExternalEmitHelpers["FirstEmitHelper"] = 1] = "FirstEmitHelper";
-        ExternalEmitHelpers[ExternalEmitHelpers["LastEmitHelper"] = 65536] = "LastEmitHelper";
-        ExternalEmitHelpers[ExternalEmitHelpers["ForOfIncludes"] = 256] = "ForOfIncludes";
-        ExternalEmitHelpers[ExternalEmitHelpers["ForAwaitOfIncludes"] = 16384] = "ForAwaitOfIncludes";
-        ExternalEmitHelpers[ExternalEmitHelpers["AsyncGeneratorIncludes"] = 6144] = "AsyncGeneratorIncludes";
-        ExternalEmitHelpers[ExternalEmitHelpers["AsyncDelegatorIncludes"] = 26624] = "AsyncDelegatorIncludes";
-        ExternalEmitHelpers[ExternalEmitHelpers["SpreadIncludes"] = 1536] = "SpreadIncludes";
-    })(ExternalEmitHelpers = ts.ExternalEmitHelpers || (ts.ExternalEmitHelpers = {}));
-    var EmitHint;
-    (function (EmitHint) {
-        EmitHint[EmitHint["SourceFile"] = 0] = "SourceFile";
-        EmitHint[EmitHint["Expression"] = 1] = "Expression";
-        EmitHint[EmitHint["IdentifierName"] = 2] = "IdentifierName";
-        EmitHint[EmitHint["MappedTypeParameter"] = 3] = "MappedTypeParameter";
-        EmitHint[EmitHint["Unspecified"] = 4] = "Unspecified";
-    })(EmitHint = ts.EmitHint || (ts.EmitHint = {}));
-    var ListFormat;
-    (function (ListFormat) {
-        ListFormat[ListFormat["None"] = 0] = "None";
-        ListFormat[ListFormat["SingleLine"] = 0] = "SingleLine";
-        ListFormat[ListFormat["MultiLine"] = 1] = "MultiLine";
-        ListFormat[ListFormat["PreserveLines"] = 2] = "PreserveLines";
-        ListFormat[ListFormat["LinesMask"] = 3] = "LinesMask";
-        ListFormat[ListFormat["NotDelimited"] = 0] = "NotDelimited";
-        ListFormat[ListFormat["BarDelimited"] = 4] = "BarDelimited";
-        ListFormat[ListFormat["AmpersandDelimited"] = 8] = "AmpersandDelimited";
-        ListFormat[ListFormat["CommaDelimited"] = 16] = "CommaDelimited";
-        ListFormat[ListFormat["DelimitersMask"] = 28] = "DelimitersMask";
-        ListFormat[ListFormat["AllowTrailingComma"] = 32] = "AllowTrailingComma";
-        ListFormat[ListFormat["Indented"] = 64] = "Indented";
-        ListFormat[ListFormat["SpaceBetweenBraces"] = 128] = "SpaceBetweenBraces";
-        ListFormat[ListFormat["SpaceBetweenSiblings"] = 256] = "SpaceBetweenSiblings";
-        ListFormat[ListFormat["Braces"] = 512] = "Braces";
-        ListFormat[ListFormat["Parenthesis"] = 1024] = "Parenthesis";
-        ListFormat[ListFormat["AngleBrackets"] = 2048] = "AngleBrackets";
-        ListFormat[ListFormat["SquareBrackets"] = 4096] = "SquareBrackets";
-        ListFormat[ListFormat["BracketsMask"] = 7680] = "BracketsMask";
-        ListFormat[ListFormat["OptionalIfUndefined"] = 8192] = "OptionalIfUndefined";
-        ListFormat[ListFormat["OptionalIfEmpty"] = 16384] = "OptionalIfEmpty";
-        ListFormat[ListFormat["Optional"] = 24576] = "Optional";
-        ListFormat[ListFormat["PreferNewLine"] = 32768] = "PreferNewLine";
-        ListFormat[ListFormat["NoTrailingNewLine"] = 65536] = "NoTrailingNewLine";
-        ListFormat[ListFormat["NoInterveningComments"] = 131072] = "NoInterveningComments";
-        ListFormat[ListFormat["NoSpaceIfEmpty"] = 262144] = "NoSpaceIfEmpty";
-        ListFormat[ListFormat["SingleElement"] = 524288] = "SingleElement";
-        ListFormat[ListFormat["Modifiers"] = 131328] = "Modifiers";
-        ListFormat[ListFormat["HeritageClauses"] = 256] = "HeritageClauses";
-        ListFormat[ListFormat["SingleLineTypeLiteralMembers"] = 384] = "SingleLineTypeLiteralMembers";
-        ListFormat[ListFormat["MultiLineTypeLiteralMembers"] = 16449] = "MultiLineTypeLiteralMembers";
-        ListFormat[ListFormat["TupleTypeElements"] = 272] = "TupleTypeElements";
-        ListFormat[ListFormat["UnionTypeConstituents"] = 260] = "UnionTypeConstituents";
-        ListFormat[ListFormat["IntersectionTypeConstituents"] = 264] = "IntersectionTypeConstituents";
-        ListFormat[ListFormat["ObjectBindingPatternElements"] = 262576] = "ObjectBindingPatternElements";
-        ListFormat[ListFormat["ArrayBindingPatternElements"] = 262448] = "ArrayBindingPatternElements";
-        ListFormat[ListFormat["ObjectLiteralExpressionProperties"] = 263122] = "ObjectLiteralExpressionProperties";
-        ListFormat[ListFormat["ArrayLiteralExpressionElements"] = 4466] = "ArrayLiteralExpressionElements";
-        ListFormat[ListFormat["CommaListElements"] = 272] = "CommaListElements";
-        ListFormat[ListFormat["CallExpressionArguments"] = 1296] = "CallExpressionArguments";
-        ListFormat[ListFormat["NewExpressionArguments"] = 9488] = "NewExpressionArguments";
-        ListFormat[ListFormat["TemplateExpressionSpans"] = 131072] = "TemplateExpressionSpans";
-        ListFormat[ListFormat["SingleLineBlockStatements"] = 384] = "SingleLineBlockStatements";
-        ListFormat[ListFormat["MultiLineBlockStatements"] = 65] = "MultiLineBlockStatements";
-        ListFormat[ListFormat["VariableDeclarationList"] = 272] = "VariableDeclarationList";
-        ListFormat[ListFormat["SingleLineFunctionBodyStatements"] = 384] = "SingleLineFunctionBodyStatements";
-        ListFormat[ListFormat["MultiLineFunctionBodyStatements"] = 1] = "MultiLineFunctionBodyStatements";
-        ListFormat[ListFormat["ClassHeritageClauses"] = 0] = "ClassHeritageClauses";
-        ListFormat[ListFormat["ClassMembers"] = 65] = "ClassMembers";
-        ListFormat[ListFormat["InterfaceMembers"] = 65] = "InterfaceMembers";
-        ListFormat[ListFormat["EnumMembers"] = 81] = "EnumMembers";
-        ListFormat[ListFormat["CaseBlockClauses"] = 65] = "CaseBlockClauses";
-        ListFormat[ListFormat["NamedImportsOrExportsElements"] = 262576] = "NamedImportsOrExportsElements";
-        ListFormat[ListFormat["JsxElementOrFragmentChildren"] = 131072] = "JsxElementOrFragmentChildren";
-        ListFormat[ListFormat["JsxElementAttributes"] = 131328] = "JsxElementAttributes";
-        ListFormat[ListFormat["CaseOrDefaultClauseStatements"] = 81985] = "CaseOrDefaultClauseStatements";
-        ListFormat[ListFormat["HeritageClauseTypes"] = 272] = "HeritageClauseTypes";
-        ListFormat[ListFormat["SourceFileStatements"] = 65537] = "SourceFileStatements";
-        ListFormat[ListFormat["Decorators"] = 24577] = "Decorators";
-        ListFormat[ListFormat["TypeArguments"] = 26896] = "TypeArguments";
-        ListFormat[ListFormat["TypeParameters"] = 26896] = "TypeParameters";
-        ListFormat[ListFormat["Parameters"] = 1296] = "Parameters";
-        ListFormat[ListFormat["IndexSignatureParameters"] = 4432] = "IndexSignatureParameters";
-    })(ListFormat = ts.ListFormat || (ts.ListFormat = {}));
-    var PragmaKindFlags;
-    (function (PragmaKindFlags) {
-        PragmaKindFlags[PragmaKindFlags["None"] = 0] = "None";
-        PragmaKindFlags[PragmaKindFlags["TripleSlashXML"] = 1] = "TripleSlashXML";
-        PragmaKindFlags[PragmaKindFlags["SingleLine"] = 2] = "SingleLine";
-        PragmaKindFlags[PragmaKindFlags["MultiLine"] = 4] = "MultiLine";
-        PragmaKindFlags[PragmaKindFlags["All"] = 7] = "All";
-        PragmaKindFlags[PragmaKindFlags["Default"] = 7] = "Default";
-    })(PragmaKindFlags = ts.PragmaKindFlags || (ts.PragmaKindFlags = {}));
-    function _contextuallyTypePragmas(args) {
-        return args;
-    }
-    ts.commentPragmas = _contextuallyTypePragmas({
-        "reference": {
-            args: [
-                { name: "types", optional: true, captureSpan: true },
-                { name: "path", optional: true, captureSpan: true },
-                { name: "no-default-lib", optional: true }
-            ],
-            kind: 1
-        },
-        "amd-dependency": {
-            args: [{ name: "path" }, { name: "name", optional: true }],
-            kind: 1
-        },
-        "amd-module": {
-            args: [{ name: "name" }],
-            kind: 1
-        },
-        "ts-check": {
-            kind: 2
-        },
-        "ts-nocheck": {
-            kind: 2
-        },
-        "jsx": {
-            args: [{ name: "factory" }],
-            kind: 4
-        },
-    });
-})(ts || (ts = {}));
-var ts;
-(function (ts) {
+    /** Gets a timestamp with (at least) ms resolution */
     ts.timestamp = typeof performance !== "undefined" && performance.now ? function () { return performance.now(); } : Date.now ? Date.now : function () { return +(new Date()); };
 })(ts || (ts = {}));
+/*@internal*/
+/** Performance measurements for the compiler. */
 (function (ts) {
     var performance;
     (function (performance) {
+        // NOTE: cannot use ts.noop as core.ts loads after this
         var profilerEvent = typeof onProfilerEvent === "function" && onProfilerEvent.profiler === true ? onProfilerEvent : function () { };
         var enabled = false;
         var profilerStart = 0;
         var counts;
         var marks;
         var measures;
+        /**
+         * Marks a performance event.
+         *
+         * @param markName The name of the mark.
+         */
         function mark(markName) {
             if (enabled) {
                 marks.set(markName, ts.timestamp());
@@ -1352,6 +64,15 @@ var ts;
             }
         }
         performance.mark = mark;
+        /**
+         * Adds a performance measurement with the specified name.
+         *
+         * @param measureName The name of the performance measurement.
+         * @param startMarkName The name of the starting mark. If not supplied, the point at which the
+         *      profiler was enabled is used.
+         * @param endMarkName The name of the ending mark. If not supplied, the current timestamp is
+         *      used.
+         */
         function measure(measureName, startMarkName, endMarkName) {
             if (enabled) {
                 var end = endMarkName && marks.get(endMarkName) || ts.timestamp();
@@ -1360,20 +81,36 @@ var ts;
             }
         }
         performance.measure = measure;
+        /**
+         * Gets the number of times a marker was encountered.
+         *
+         * @param markName The name of the mark.
+         */
         function getCount(markName) {
             return counts && counts.get(markName) || 0;
         }
         performance.getCount = getCount;
+        /**
+         * Gets the total duration of all measurements with the supplied name.
+         *
+         * @param measureName The name of the measure whose durations should be accumulated.
+         */
         function getDuration(measureName) {
             return measures && measures.get(measureName) || 0;
         }
         performance.getDuration = getDuration;
+        /**
+         * Iterate over each measure, performing some action
+         *
+         * @param cb The action to perform for each measure
+         */
         function forEachMeasure(cb) {
             measures.forEach(function (measure, key) {
                 cb(key, measure);
             });
         }
         performance.forEachMeasure = forEachMeasure;
+        /** Enables (and resets) performance measurements for the compiler. */
         function enable() {
             counts = ts.createMap();
             marks = ts.createMap();
@@ -1382,6 +119,7 @@ var ts;
             profilerStart = ts.timestamp();
         }
         performance.enable = enable;
+        /** Disables performance measurements for the compiler. */
         function disable() {
             enabled = false;
         }
@@ -1390,52 +128,48 @@ var ts;
 })(ts || (ts = {}));
 var ts;
 (function (ts) {
+    // WARNING: The script `configureNightly.ts` uses a regexp to parse out these values.
+    // If changing the text in this section, be sure to test `configureNightly` too.
     ts.versionMajorMinor = "3.0";
+    /** The version of the TypeScript compiler release */
     ts.version = ts.versionMajorMinor + ".0-dev";
 })(ts || (ts = {}));
+/* @internal */
 (function (ts) {
-    function isExternalModuleNameRelative(moduleName) {
-        return ts.pathIsRelative(moduleName) || ts.isRootedDiskPath(moduleName);
-    }
-    ts.isExternalModuleNameRelative = isExternalModuleNameRelative;
-    function sortAndDeduplicateDiagnostics(diagnostics) {
-        return ts.sortAndDeduplicate(diagnostics, ts.compareDiagnostics);
-    }
-    ts.sortAndDeduplicateDiagnostics = sortAndDeduplicateDiagnostics;
-})(ts || (ts = {}));
-(function (ts) {
-    ts.emptyArray = [];
-    function closeFileWatcher(watcher) {
-        watcher.close();
-    }
-    ts.closeFileWatcher = closeFileWatcher;
+    var Comparison;
+    (function (Comparison) {
+        Comparison[Comparison["LessThan"] = -1] = "LessThan";
+        Comparison[Comparison["EqualTo"] = 0] = "EqualTo";
+        Comparison[Comparison["GreaterThan"] = 1] = "GreaterThan";
+    })(Comparison = ts.Comparison || (ts.Comparison = {}));
+    /** Create a MapLike with good performance. */
     function createDictionaryObject() {
-        var map = Object.create(null);
+        var map = Object.create(/*prototype*/ null); // tslint:disable-line:no-null-keyword
+        // Using 'delete' on an object causes V8 to put the object in dictionary mode.
+        // This disables creation of hidden classes, which are expensive when an object is
+        // constantly changing shape.
         map.__ = undefined;
         delete map.__;
         return map;
     }
+    /** Create a new map. If a template object is provided, the map will copy entries from it. */
     function createMap() {
-        return new MapCtr();
+        return new ts.MapCtr();
     }
     ts.createMap = createMap;
-    function createUnderscoreEscapedMap() {
-        return new MapCtr();
-    }
-    ts.createUnderscoreEscapedMap = createUnderscoreEscapedMap;
-    function createSymbolTable(symbols) {
-        var result = createMap();
-        if (symbols) {
-            for (var _i = 0, symbols_1 = symbols; _i < symbols_1.length; _i++) {
-                var symbol = symbols_1[_i];
-                result.set(symbol.escapedName, symbol);
-            }
+    function createMapFromEntries(entries) {
+        var map = createMap();
+        for (var _i = 0, entries_1 = entries; _i < entries_1.length; _i++) {
+            var _a = entries_1[_i], key = _a[0], value = _a[1];
+            map.set(key, value);
         }
-        return result;
+        return map;
     }
-    ts.createSymbolTable = createSymbolTable;
+    ts.createMapFromEntries = createMapFromEntries;
     function createMapFromTemplate(template) {
-        var map = new MapCtr();
+        var map = new ts.MapCtr();
+        // Copies keys/values from template. Note that for..in will not throw if
+        // template is undefined, and instead will just exit the loop.
         for (var key in template) {
             if (hasOwnProperty.call(template, key)) {
                 map.set(key, template[key]);
@@ -1444,9 +178,12 @@ var ts;
         return map;
     }
     ts.createMapFromTemplate = createMapFromTemplate;
-    var MapCtr = typeof Map !== "undefined" && "entries" in Map.prototype ? Map : shimMap();
+    // Internet Explorer's Map doesn't support iteration, so don't use it.
+    // tslint:disable-next-line no-in-operator variable-name
+    ts.MapCtr = typeof Map !== "undefined" && "entries" in Map.prototype ? Map : shimMap();
+    // Keep the class inside a function so it doesn't get compiled if it's not used.
     function shimMap() {
-        var MapIterator = (function () {
+        var MapIterator = /** @class */ (function () {
             function MapIterator(data, selector) {
                 this.index = 0;
                 this.data = data;
@@ -1463,7 +200,7 @@ var ts;
             };
             return MapIterator;
         }());
-        return (function () {
+        return /** @class */ (function () {
             function class_1() {
                 this.data = createDictionaryObject();
                 this.size = 0;
@@ -1479,6 +216,7 @@ var ts;
                 return this;
             };
             class_1.prototype.has = function (key) {
+                // tslint:disable-next-line:no-in-operator
                 return key in this.data;
             };
             class_1.prototype.delete = function (key) {
@@ -1510,21 +248,15 @@ var ts;
             return class_1;
         }());
     }
-    function toPath(fileName, basePath, getCanonicalFileName) {
-        var nonCanonicalizedPath = isRootedDiskPath(fileName)
-            ? normalizePath(fileName)
-            : getNormalizedAbsolutePath(fileName, basePath);
-        return getCanonicalFileName(nonCanonicalizedPath);
-    }
-    ts.toPath = toPath;
     function length(array) {
         return array ? array.length : 0;
     }
     ts.length = length;
-    function hasEntries(map) {
-        return !!map && !!map.size;
-    }
-    ts.hasEntries = hasEntries;
+    /**
+     * Iterates through 'array' by index and performs the callback on each element of array until the callback
+     * returns a truthy value, then returns that value.
+     * If no such value is found, the callback is applied to each element of array and undefined is returned.
+     */
     function forEach(array, callback) {
         if (array) {
             for (var i = 0; i < array.length; i++) {
@@ -1537,6 +269,7 @@ var ts;
         return undefined;
     }
     ts.forEach = forEach;
+    /** Like `forEach`, but suitable for use with numbers and strings (which may be falsy). */
     function firstDefined(array, callback) {
         if (array === undefined) {
             return undefined;
@@ -1563,20 +296,6 @@ var ts;
         }
     }
     ts.firstDefinedIterator = firstDefinedIterator;
-    function findAncestor(node, callback) {
-        while (node) {
-            var result = callback(node);
-            if (result === "quit") {
-                return undefined;
-            }
-            else if (result) {
-                return node;
-            }
-            node = node.parent;
-        }
-        return undefined;
-    }
-    ts.findAncestor = findAncestor;
     function zipWith(arrayA, arrayB, callback) {
         var result = [];
         Debug.assertEqual(arrayA.length, arrayB.length);
@@ -1609,6 +328,11 @@ var ts;
         return map;
     }
     ts.zipToMap = zipToMap;
+    /**
+     * Iterates through `array` by index and performs the callback on each element of array until the callback
+     * returns a falsey value, then returns false.
+     * If no such value is found, the callback is applied to each element of array and `true` is returned.
+     */
     function every(array, callback) {
         if (array) {
             for (var i = 0; i < array.length; i++) {
@@ -1640,6 +364,7 @@ var ts;
         return undefined;
     }
     ts.findLast = findLast;
+    /** Works like Array.prototype.findIndex, returning `-1` if no element satisfying the predicate is found. */
     function findIndex(array, predicate, startIndex) {
         for (var i = startIndex || 0; i < array.length; i++) {
             if (predicate(array[i], i)) {
@@ -1658,6 +383,10 @@ var ts;
         return -1;
     }
     ts.findLastIndex = findLastIndex;
+    /**
+     * Returns the first truthy result of `callback`, or else fails.
+     * This is like `forEach`, but never returns undefined.
+     */
     function findMap(array, callback) {
         for (var i = 0; i < array.length; i++) {
             var result = callback(array[i], i);
@@ -1988,6 +717,7 @@ var ts;
         return false;
     }
     ts.some = some;
+    /** Calls the callback with (start, afterEnd) index pairs for each range where 'pred' is true. */
     function getRangesWhere(arr, pred, cb) {
         var start;
         for (var i = 0; i < arr.length; i++) {
@@ -2014,6 +744,8 @@ var ts;
     }
     ts.concatenate = concatenate;
     function deduplicateRelational(array, equalityComparer, comparer) {
+        // Perform a stable sort of the array. This ensures the first entry in a list of
+        // duplicates remains the first entry in the result.
         var indices = array.map(function (_, i) { return i; });
         stableSortIndices(array, indices, comparer);
         var last = array[indices[0]];
@@ -2026,6 +758,7 @@ var ts;
                 last = item;
             }
         }
+        // restore original order
         deduplicated.sort();
         return deduplicated.map(function (i) { return array[i]; });
     }
@@ -2055,10 +788,13 @@ var ts;
         for (var i = 1; i < array.length; i++) {
             var next = array[i];
             switch (comparer(next, last)) {
+                // equality comparison
                 case true:
-                case 0:
+                // relational comparison
+                case 0 /* EqualTo */:
                     continue;
-                case -1:
+                case -1 /* LessThan */:
+                    // If `array` is sorted, `next` should **never** be less than `last`.
                     return Debug.fail("Array is unsorted.");
             }
             deduplicated.push(last = next);
@@ -2096,25 +832,6 @@ var ts;
         return true;
     }
     ts.arrayIsEqualTo = arrayIsEqualTo;
-    function changesAffectModuleResolution(oldOptions, newOptions) {
-        return !oldOptions ||
-            (oldOptions.module !== newOptions.module) ||
-            (oldOptions.moduleResolution !== newOptions.moduleResolution) ||
-            (oldOptions.noResolve !== newOptions.noResolve) ||
-            (oldOptions.target !== newOptions.target) ||
-            (oldOptions.noLib !== newOptions.noLib) ||
-            (oldOptions.jsx !== newOptions.jsx) ||
-            (oldOptions.allowJs !== newOptions.allowJs) ||
-            (oldOptions.rootDir !== newOptions.rootDir) ||
-            (oldOptions.configFilePath !== newOptions.configFilePath) ||
-            (oldOptions.baseUrl !== newOptions.baseUrl) ||
-            (oldOptions.maxNodeModuleJsDepth !== newOptions.maxNodeModuleJsDepth) ||
-            !arrayIsEqualTo(oldOptions.lib, newOptions.lib) ||
-            !arrayIsEqualTo(oldOptions.typeRoots, newOptions.typeRoots) ||
-            !arrayIsEqualTo(oldOptions.rootDirs, newOptions.rootDirs) ||
-            !equalOwnProperties(oldOptions.paths, newOptions.paths);
-    }
-    ts.changesAffectModuleResolution = changesAffectModuleResolution;
     function compact(array) {
         var result;
         if (array) {
@@ -2133,25 +850,41 @@ var ts;
         return result || array;
     }
     ts.compact = compact;
+    /**
+     * Gets the relative complement of `arrayA` with respect to `arrayB`, returning the elements that
+     * are not present in `arrayA` but are present in `arrayB`. Assumes both arrays are sorted
+     * based on the provided comparer.
+     */
     function relativeComplement(arrayA, arrayB, comparer) {
         if (!arrayB || !arrayA || arrayB.length === 0 || arrayA.length === 0)
             return arrayB;
         var result = [];
         loopB: for (var offsetA = 0, offsetB = 0; offsetB < arrayB.length; offsetB++) {
             if (offsetB > 0) {
-                Debug.assertGreaterThanOrEqual(comparer(arrayB[offsetB], arrayB[offsetB - 1]), 0);
+                // Ensure `arrayB` is properly sorted.
+                Debug.assertGreaterThanOrEqual(comparer(arrayB[offsetB], arrayB[offsetB - 1]), 0 /* EqualTo */);
             }
             loopA: for (var startA = offsetA; offsetA < arrayA.length; offsetA++) {
                 if (offsetA > startA) {
-                    Debug.assertGreaterThanOrEqual(comparer(arrayA[offsetA], arrayA[offsetA - 1]), 0);
+                    // Ensure `arrayA` is properly sorted. We only need to perform this check if
+                    // `offsetA` has changed since we entered the loop.
+                    Debug.assertGreaterThanOrEqual(comparer(arrayA[offsetA], arrayA[offsetA - 1]), 0 /* EqualTo */);
                 }
                 switch (comparer(arrayB[offsetB], arrayA[offsetA])) {
-                    case -1:
+                    case -1 /* LessThan */:
+                        // If B is less than A, B does not exist in arrayA. Add B to the result and
+                        // move to the next element in arrayB without changing the current position
+                        // in arrayA.
                         result.push(arrayB[offsetB]);
                         continue loopB;
-                    case 0:
+                    case 0 /* EqualTo */:
+                        // If B is equal to A, B exists in arrayA. Move to the next element in
+                        // arrayB without adding B to the result or changing the current position
+                        // in arrayA.
                         continue loopB;
-                    case 1:
+                    case 1 /* GreaterThan */:
+                        // If B is greater than A, we need to keep looking for B in arrayA. Move to
+                        // the next element in arrayA and recheck.
                         continue loopA;
                 }
             }
@@ -2177,6 +910,10 @@ var ts;
         return to;
     }
     ts.append = append;
+    /**
+     * Gets the actual offset into an array for a relative offset. Negative offsets indicate a
+     * position offset from the end of the array.
+     */
     function toOffset(array, offset) {
         return offset < 0 ? array.length + offset : offset;
     }
@@ -2195,6 +932,9 @@ var ts;
         return to;
     }
     ts.addRange = addRange;
+    /**
+     * @return Whether the value was added.
+     */
     function pushIfUnique(array, toAdd, equalityComparer) {
         if (contains(array, toAdd, equalityComparer)) {
             return false;
@@ -2205,6 +945,9 @@ var ts;
         }
     }
     ts.pushIfUnique = pushIfUnique;
+    /**
+     * Unlike `pushIfUnique`, this can take `undefined` as an input, and returns a new array.
+     */
     function appendIfUnique(array, toAdd, equalityComparer) {
         if (array) {
             pushIfUnique(array, toAdd, equalityComparer);
@@ -2216,8 +959,12 @@ var ts;
     }
     ts.appendIfUnique = appendIfUnique;
     function stableSortIndices(array, indices, comparer) {
+        // sort indices by value then position
         indices.sort(function (x, y) { return comparer(array[x], array[y]) || compareValues(x, y); });
     }
+    /**
+     * Returns a new sorted array.
+     */
     function sort(array, comparer) {
         return array.slice().sort(comparer);
     }
@@ -2252,6 +999,9 @@ var ts;
             } };
     }
     ts.arrayIterator = arrayIterator;
+    /**
+     * Stable sort of an array. Elements equal to each other maintain their relative position in the array.
+     */
     function stableSort(array, comparer) {
         var indices = array.map(function (_, i) { return i; });
         stableSortIndices(array, indices, comparer);
@@ -2268,6 +1018,10 @@ var ts;
         return true;
     }
     ts.rangeEquals = rangeEquals;
+    /**
+     * Returns the element at a specific offset in an array if non-empty, `undefined` otherwise.
+     * A negative offset indicates the element should be retrieved from the end of the array.
+     */
     function elementAt(array, offset) {
         if (array) {
             offset = toOffset(array, offset);
@@ -2278,6 +1032,9 @@ var ts;
         return undefined;
     }
     ts.elementAt = elementAt;
+    /**
+     * Returns the first element of an array if non-empty, `undefined` otherwise.
+     */
     function firstOrUndefined(array) {
         return array.length === 0 ? undefined : array[0];
     }
@@ -2287,6 +1044,9 @@ var ts;
         return array[0];
     }
     ts.first = first;
+    /**
+     * Returns the last element of an array if non-empty, `undefined` otherwise.
+     */
     function lastOrUndefined(array) {
         return array.length === 0 ? undefined : array[array.length - 1];
     }
@@ -2296,6 +1056,9 @@ var ts;
         return array[array.length - 1];
     }
     ts.last = last;
+    /**
+     * Returns the only element of an array if it contains only one element, `undefined` otherwise.
+     */
     function singleOrUndefined(array) {
         return array && array.length === 1
             ? array[0]
@@ -2314,6 +1077,17 @@ var ts;
         return result;
     }
     ts.replaceElement = replaceElement;
+    /**
+     * Performs a binary search, finding the index at which `value` occurs in `array`.
+     * If no such index is found, returns the 2's-complement of first index at which
+     * `array[index]` exceeds `value`.
+     * @param array A sorted array whose first element must be no larger than number
+     * @param value The value to be searched for in the array.
+     * @param keySelector A callback used to select the search key from `value` and each element of
+     * `array`.
+     * @param keyComparer A callback used to compare two keys in a sorted array.
+     * @param offset An offset into `array` at which to start the search.
+     */
     function binarySearch(array, value, keySelector, keyComparer, offset) {
         if (!array || array.length === 0) {
             return -1;
@@ -2325,12 +1099,12 @@ var ts;
             var middle = low + ((high - low) >> 1);
             var midKey = keySelector(array[middle]);
             switch (keyComparer(midKey, key)) {
-                case -1:
+                case -1 /* LessThan */:
                     low = middle + 1;
                     break;
-                case 0:
+                case 0 /* EqualTo */:
                     return middle;
-                case 1:
+                case 1 /* GreaterThan */:
                     high = middle - 1;
                     break;
             }
@@ -2363,14 +1137,29 @@ var ts;
     }
     ts.reduceLeft = reduceLeft;
     var hasOwnProperty = Object.prototype.hasOwnProperty;
+    /**
+     * Indicates whether a map-like contains an own property with the specified key.
+     *
+     * @param map A map-like.
+     * @param key A property key.
+     */
     function hasProperty(map, key) {
         return hasOwnProperty.call(map, key);
     }
     ts.hasProperty = hasProperty;
+    /**
+     * Gets the value of an owned property in a map-like.
+     *
+     * @param map A map-like.
+     * @param key A property key.
+     */
     function getProperty(map, key) {
         return hasOwnProperty.call(map, key) ? map[key] : undefined;
     }
     ts.getProperty = getProperty;
+    /**
+     * Gets the owned, enumerable property keys of a map-like.
+     */
     function getOwnKeys(map) {
         var keys = [];
         for (var key in map) {
@@ -2400,37 +1189,6 @@ var ts;
         return result;
     }
     ts.arrayFrom = arrayFrom;
-    function forEachEntry(map, callback) {
-        var _a;
-        var iterator = map.entries();
-        for (var _b = iterator.next(), pair = _b.value, done = _b.done; !done; _a = iterator.next(), pair = _a.value, done = _a.done, _a) {
-            var key = pair[0], value = pair[1];
-            var result = callback(value, key);
-            if (result) {
-                return result;
-            }
-        }
-        return undefined;
-    }
-    ts.forEachEntry = forEachEntry;
-    function forEachKey(map, callback) {
-        var _a;
-        var iterator = map.keys();
-        for (var _b = iterator.next(), key = _b.value, done = _b.done; !done; _a = iterator.next(), key = _a.value, done = _a.done, _a) {
-            var result = callback(key);
-            if (result) {
-                return result;
-            }
-        }
-        return undefined;
-    }
-    ts.forEachKey = forEachKey;
-    function copyEntries(source, target) {
-        source.forEach(function (value, key) {
-            target.set(key, value);
-        });
-    }
-    ts.copyEntries = copyEntries;
     function assign(t) {
         var args = [];
         for (var _i = 1; _i < arguments.length; _i++) {
@@ -2440,13 +1198,19 @@ var ts;
             var arg = args_1[_a];
             for (var p in arg) {
                 if (hasProperty(arg, p)) {
-                    t[p] = arg[p];
+                    t[p] = arg[p]; // TODO: GH#23368
                 }
             }
         }
         return t;
     }
     ts.assign = assign;
+    /**
+     * Performs a shallow equality comparison of the contents of two map-likes.
+     *
+     * @param left A map-like whose properties should be compared.
+     * @param right A map-like whose properties should be compared.
+     */
     function equalOwnProperties(left, right, equalityComparer) {
         if (equalityComparer === void 0) { equalityComparer = equateValues; }
         if (left === right)
@@ -2492,10 +1256,6 @@ var ts;
         return result;
     }
     ts.arrayToNumericMap = arrayToNumericMap;
-    function arrayToSet(array, makeKey) {
-        return arrayToMap(array, makeKey || (function (s) { return s; }), function () { return true; });
-    }
-    ts.arrayToSet = arrayToSet;
     function arrayToMultiMap(values, makeKey, makeValue) {
         if (makeValue === void 0) { makeValue = identity; }
         var result = createMultiMap();
@@ -2510,12 +1270,6 @@ var ts;
         return arrayFrom(arrayToMultiMap(values, getGroupId).values());
     }
     ts.group = group;
-    function cloneMap(map) {
-        var clone = createMap();
-        copyEntries(map, clone);
-        return clone;
-    }
-    ts.cloneMap = cloneMap;
     function clone(object) {
         var result = {};
         for (var id in object) {
@@ -2567,6 +1321,9 @@ var ts;
             }
         }
     }
+    /**
+     * Tests whether a value is an array.
+     */
     function isArray(value) {
         return Array.isArray ? Array.isArray(value) : value instanceof Array;
     }
@@ -2575,6 +1332,9 @@ var ts;
         return isArray(value) ? value : [value];
     }
     ts.toArray = toArray;
+    /**
+     * Tests whether a value is string
+     */
     function isString(text) {
         return typeof text === "string";
     }
@@ -2586,24 +1346,25 @@ var ts;
     function cast(value, test) {
         if (value !== undefined && test(value))
             return value;
-        if (value && typeof value.kind === "number") {
-            return Debug.fail("Invalid cast. The supplied " + Debug.showSyntaxKind(value) + " did not pass the test '" + Debug.getFunctionName(test) + "'.");
-        }
-        else {
-            return Debug.fail("Invalid cast. The supplied value did not pass the test '" + Debug.getFunctionName(test) + "'.");
-        }
+        return Debug.fail("Invalid cast. The supplied value " + value + " did not pass the test '" + Debug.getFunctionName(test) + "'.");
     }
     ts.cast = cast;
-    function noop(_) { }
+    /** Does nothing. */
+    function noop(_) { } // tslint:disable-line no-empty
     ts.noop = noop;
+    /** Do nothing and return false */
     function returnFalse() { return false; }
     ts.returnFalse = returnFalse;
+    /** Do nothing and return true */
     function returnTrue() { return true; }
     ts.returnTrue = returnTrue;
+    /** Returns its argument. */
     function identity(x) { return x; }
     ts.identity = identity;
+    /** Returns lower case string */
     function toLowerCase(x) { return x.toLowerCase(); }
     ts.toLowerCase = toLowerCase;
+    /** Throws an error because a function is not implemented. */
     function notImplemented() {
         throw new Error("Not implemented");
     }
@@ -2669,1114 +1430,6 @@ var ts;
         }
     }
     ts.compose = compose;
-    function formatStringFromArgs(text, args, baseIndex) {
-        if (baseIndex === void 0) { baseIndex = 0; }
-        return text.replace(/{(\d+)}/g, function (_match, index) { return Debug.assertDefined(args[+index + baseIndex]); });
-    }
-    ts.formatStringFromArgs = formatStringFromArgs;
-    function getLocaleSpecificMessage(message) {
-        return ts.localizedDiagnosticMessages && ts.localizedDiagnosticMessages[message.key] || message.message;
-    }
-    ts.getLocaleSpecificMessage = getLocaleSpecificMessage;
-    function createFileDiagnostic(file, start, length, message) {
-        Debug.assertGreaterThanOrEqual(start, 0);
-        Debug.assertGreaterThanOrEqual(length, 0);
-        if (file) {
-            Debug.assertLessThanOrEqual(start, file.text.length);
-            Debug.assertLessThanOrEqual(start + length, file.text.length);
-        }
-        var text = getLocaleSpecificMessage(message);
-        if (arguments.length > 4) {
-            text = formatStringFromArgs(text, arguments, 4);
-        }
-        return {
-            file: file,
-            start: start,
-            length: length,
-            messageText: text,
-            category: message.category,
-            code: message.code,
-            reportsUnnecessary: message.reportsUnnecessary,
-        };
-    }
-    ts.createFileDiagnostic = createFileDiagnostic;
-    function formatMessage(_dummy, message) {
-        var text = getLocaleSpecificMessage(message);
-        if (arguments.length > 2) {
-            text = formatStringFromArgs(text, arguments, 2);
-        }
-        return text;
-    }
-    ts.formatMessage = formatMessage;
-    function createCompilerDiagnostic(message) {
-        var text = getLocaleSpecificMessage(message);
-        if (arguments.length > 1) {
-            text = formatStringFromArgs(text, arguments, 1);
-        }
-        return {
-            file: undefined,
-            start: undefined,
-            length: undefined,
-            messageText: text,
-            category: message.category,
-            code: message.code,
-            reportsUnnecessary: message.reportsUnnecessary,
-        };
-    }
-    ts.createCompilerDiagnostic = createCompilerDiagnostic;
-    function createCompilerDiagnosticFromMessageChain(chain) {
-        return {
-            file: undefined,
-            start: undefined,
-            length: undefined,
-            code: chain.code,
-            category: chain.category,
-            messageText: chain.next ? chain : chain.messageText,
-        };
-    }
-    ts.createCompilerDiagnosticFromMessageChain = createCompilerDiagnosticFromMessageChain;
-    function chainDiagnosticMessages(details, message) {
-        var text = getLocaleSpecificMessage(message);
-        if (arguments.length > 2) {
-            text = formatStringFromArgs(text, arguments, 2);
-        }
-        return {
-            messageText: text,
-            category: message.category,
-            code: message.code,
-            next: details
-        };
-    }
-    ts.chainDiagnosticMessages = chainDiagnosticMessages;
-    function concatenateDiagnosticMessageChains(headChain, tailChain) {
-        var lastChain = headChain;
-        while (lastChain.next) {
-            lastChain = lastChain.next;
-        }
-        lastChain.next = tailChain;
-        return headChain;
-    }
-    ts.concatenateDiagnosticMessageChains = concatenateDiagnosticMessageChains;
-    function equateValues(a, b) {
-        return a === b;
-    }
-    ts.equateValues = equateValues;
-    function equateStringsCaseInsensitive(a, b) {
-        return a === b
-            || a !== undefined
-                && b !== undefined
-                && a.toUpperCase() === b.toUpperCase();
-    }
-    ts.equateStringsCaseInsensitive = equateStringsCaseInsensitive;
-    function equateStringsCaseSensitive(a, b) {
-        return equateValues(a, b);
-    }
-    ts.equateStringsCaseSensitive = equateStringsCaseSensitive;
-    function compareComparableValues(a, b) {
-        return a === b ? 0 :
-            a === undefined ? -1 :
-                b === undefined ? 1 :
-                    a < b ? -1 :
-                        1;
-    }
-    function compareValues(a, b) {
-        return compareComparableValues(a, b);
-    }
-    ts.compareValues = compareValues;
-    function min(a, b, compare) {
-        return compare(a, b) === -1 ? a : b;
-    }
-    ts.min = min;
-    function compareStringsCaseInsensitive(a, b) {
-        if (a === b)
-            return 0;
-        if (a === undefined)
-            return -1;
-        if (b === undefined)
-            return 1;
-        a = a.toUpperCase();
-        b = b.toUpperCase();
-        return a < b ? -1 : a > b ? 1 : 0;
-    }
-    ts.compareStringsCaseInsensitive = compareStringsCaseInsensitive;
-    function compareStringsCaseSensitive(a, b) {
-        return compareComparableValues(a, b);
-    }
-    ts.compareStringsCaseSensitive = compareStringsCaseSensitive;
-    function getStringComparer(ignoreCase) {
-        return ignoreCase ? compareStringsCaseInsensitive : compareStringsCaseSensitive;
-    }
-    ts.getStringComparer = getStringComparer;
-    var createUIStringComparer = (function () {
-        var defaultComparer;
-        var enUSComparer;
-        var stringComparerFactory = getStringComparerFactory();
-        return createStringComparer;
-        function compareWithCallback(a, b, comparer) {
-            if (a === b)
-                return 0;
-            if (a === undefined)
-                return -1;
-            if (b === undefined)
-                return 1;
-            var value = comparer(a, b);
-            return value < 0 ? -1 : value > 0 ? 1 : 0;
-        }
-        function createIntlCollatorStringComparer(locale) {
-            var comparer = new Intl.Collator(locale, { usage: "sort", sensitivity: "variant" }).compare;
-            return function (a, b) { return compareWithCallback(a, b, comparer); };
-        }
-        function createLocaleCompareStringComparer(locale) {
-            if (locale !== undefined)
-                return createFallbackStringComparer();
-            return function (a, b) { return compareWithCallback(a, b, compareStrings); };
-            function compareStrings(a, b) {
-                return a.localeCompare(b);
-            }
-        }
-        function createFallbackStringComparer() {
-            return function (a, b) { return compareWithCallback(a, b, compareDictionaryOrder); };
-            function compareDictionaryOrder(a, b) {
-                return compareStrings(a.toUpperCase(), b.toUpperCase()) || compareStrings(a, b);
-            }
-            function compareStrings(a, b) {
-                return a < b ? -1 : a > b ? 1 : 0;
-            }
-        }
-        function getStringComparerFactory() {
-            if (typeof Intl === "object" && typeof Intl.Collator === "function") {
-                return createIntlCollatorStringComparer;
-            }
-            if (typeof String.prototype.localeCompare === "function" &&
-                typeof String.prototype.toLocaleUpperCase === "function" &&
-                "a".localeCompare("B") < 0) {
-                return createLocaleCompareStringComparer;
-            }
-            return createFallbackStringComparer;
-        }
-        function createStringComparer(locale) {
-            if (locale === undefined) {
-                return defaultComparer || (defaultComparer = stringComparerFactory(locale));
-            }
-            else if (locale === "en-US") {
-                return enUSComparer || (enUSComparer = stringComparerFactory(locale));
-            }
-            else {
-                return stringComparerFactory(locale);
-            }
-        }
-    })();
-    var uiComparerCaseSensitive;
-    var uiLocale;
-    function getUILocale() {
-        return uiLocale;
-    }
-    ts.getUILocale = getUILocale;
-    function setUILocale(value) {
-        if (uiLocale !== value) {
-            uiLocale = value;
-            uiComparerCaseSensitive = undefined;
-        }
-    }
-    ts.setUILocale = setUILocale;
-    function compareStringsCaseSensitiveUI(a, b) {
-        var comparer = uiComparerCaseSensitive || (uiComparerCaseSensitive = createUIStringComparer(uiLocale));
-        return comparer(a, b);
-    }
-    ts.compareStringsCaseSensitiveUI = compareStringsCaseSensitiveUI;
-    function compareProperties(a, b, key, comparer) {
-        return a === b ? 0 :
-            a === undefined ? -1 :
-                b === undefined ? 1 :
-                    comparer(a[key], b[key]);
-    }
-    ts.compareProperties = compareProperties;
-    function getDiagnosticFilePath(diagnostic) {
-        return diagnostic.file ? diagnostic.file.path : undefined;
-    }
-    function compareDiagnostics(d1, d2) {
-        return compareStringsCaseSensitive(getDiagnosticFilePath(d1), getDiagnosticFilePath(d2)) ||
-            compareValues(d1.start, d2.start) ||
-            compareValues(d1.length, d2.length) ||
-            compareValues(d1.code, d2.code) ||
-            compareMessageText(d1.messageText, d2.messageText) ||
-            0;
-    }
-    ts.compareDiagnostics = compareDiagnostics;
-    function compareBooleans(a, b) {
-        return compareValues(a ? 1 : 0, b ? 1 : 0);
-    }
-    ts.compareBooleans = compareBooleans;
-    function compareMessageText(t1, t2) {
-        var text1 = t1;
-        var text2 = t2;
-        while (text1 && text2) {
-            var string1 = isString(text1) ? text1 : text1.messageText;
-            var string2 = isString(text2) ? text2 : text2.messageText;
-            var res = compareStringsCaseSensitive(string1, string2);
-            if (res) {
-                return res;
-            }
-            text1 = isString(text1) ? undefined : text1.next;
-            text2 = isString(text2) ? undefined : text2.next;
-        }
-        if (!text1 && !text2) {
-            return 0;
-        }
-        return text1 ? 1 : -1;
-    }
-    function getEmitScriptTarget(compilerOptions) {
-        return compilerOptions.target || 0;
-    }
-    ts.getEmitScriptTarget = getEmitScriptTarget;
-    function getEmitModuleKind(compilerOptions) {
-        return typeof compilerOptions.module === "number" ?
-            compilerOptions.module :
-            getEmitScriptTarget(compilerOptions) >= 2 ? ts.ModuleKind.ES2015 : ts.ModuleKind.CommonJS;
-    }
-    ts.getEmitModuleKind = getEmitModuleKind;
-    function getEmitModuleResolutionKind(compilerOptions) {
-        var moduleResolution = compilerOptions.moduleResolution;
-        if (moduleResolution === undefined) {
-            moduleResolution = getEmitModuleKind(compilerOptions) === ts.ModuleKind.CommonJS ? ts.ModuleResolutionKind.NodeJs : ts.ModuleResolutionKind.Classic;
-        }
-        return moduleResolution;
-    }
-    ts.getEmitModuleResolutionKind = getEmitModuleResolutionKind;
-    function unreachableCodeIsError(options) {
-        return options.allowUnreachableCode === false;
-    }
-    ts.unreachableCodeIsError = unreachableCodeIsError;
-    function unusedLabelIsError(options) {
-        return options.allowUnusedLabels === false;
-    }
-    ts.unusedLabelIsError = unusedLabelIsError;
-    function getAreDeclarationMapsEnabled(options) {
-        return !!(options.declaration && options.declarationMap);
-    }
-    ts.getAreDeclarationMapsEnabled = getAreDeclarationMapsEnabled;
-    function getAllowSyntheticDefaultImports(compilerOptions) {
-        var moduleKind = getEmitModuleKind(compilerOptions);
-        return compilerOptions.allowSyntheticDefaultImports !== undefined
-            ? compilerOptions.allowSyntheticDefaultImports
-            : compilerOptions.esModuleInterop
-                ? moduleKind !== ts.ModuleKind.None && moduleKind < ts.ModuleKind.ES2015
-                : moduleKind === ts.ModuleKind.System;
-    }
-    ts.getAllowSyntheticDefaultImports = getAllowSyntheticDefaultImports;
-    function getEmitDeclarations(compilerOptions) {
-        return !!(compilerOptions.declaration || compilerOptions.composite);
-    }
-    ts.getEmitDeclarations = getEmitDeclarations;
-    function getStrictOptionValue(compilerOptions, flag) {
-        return compilerOptions[flag] === undefined ? !!compilerOptions.strict : !!compilerOptions[flag];
-    }
-    ts.getStrictOptionValue = getStrictOptionValue;
-    function hasZeroOrOneAsteriskCharacter(str) {
-        var seenAsterisk = false;
-        for (var i = 0; i < str.length; i++) {
-            if (str.charCodeAt(i) === 42) {
-                if (!seenAsterisk) {
-                    seenAsterisk = true;
-                }
-                else {
-                    return false;
-                }
-            }
-        }
-        return true;
-    }
-    ts.hasZeroOrOneAsteriskCharacter = hasZeroOrOneAsteriskCharacter;
-    ts.directorySeparator = "/";
-    var altDirectorySeparator = "\\";
-    var urlSchemeSeparator = "://";
-    var backslashRegExp = /\\/g;
-    function normalizeSlashes(path) {
-        return path.replace(backslashRegExp, ts.directorySeparator);
-    }
-    ts.normalizeSlashes = normalizeSlashes;
-    function isVolumeCharacter(charCode) {
-        return (charCode >= 97 && charCode <= 122) ||
-            (charCode >= 65 && charCode <= 90);
-    }
-    function getFileUrlVolumeSeparatorEnd(url, start) {
-        var ch0 = url.charCodeAt(start);
-        if (ch0 === 58)
-            return start + 1;
-        if (ch0 === 37 && url.charCodeAt(start + 1) === 51) {
-            var ch2 = url.charCodeAt(start + 2);
-            if (ch2 === 97 || ch2 === 65)
-                return start + 3;
-        }
-        return -1;
-    }
-    function getEncodedRootLength(path) {
-        if (!path)
-            return 0;
-        var ch0 = path.charCodeAt(0);
-        if (ch0 === 47 || ch0 === 92) {
-            if (path.charCodeAt(1) !== ch0)
-                return 1;
-            var p1 = path.indexOf(ch0 === 47 ? ts.directorySeparator : altDirectorySeparator, 2);
-            if (p1 < 0)
-                return path.length;
-            return p1 + 1;
-        }
-        if (isVolumeCharacter(ch0) && path.charCodeAt(1) === 58) {
-            var ch2 = path.charCodeAt(2);
-            if (ch2 === 47 || ch2 === 92)
-                return 3;
-            if (path.length === 2)
-                return 2;
-        }
-        var schemeEnd = path.indexOf(urlSchemeSeparator);
-        if (schemeEnd !== -1) {
-            var authorityStart = schemeEnd + urlSchemeSeparator.length;
-            var authorityEnd = path.indexOf(ts.directorySeparator, authorityStart);
-            if (authorityEnd !== -1) {
-                var scheme = path.slice(0, schemeEnd);
-                var authority = path.slice(authorityStart, authorityEnd);
-                if (scheme === "file" && (authority === "" || authority === "localhost") &&
-                    isVolumeCharacter(path.charCodeAt(authorityEnd + 1))) {
-                    var volumeSeparatorEnd = getFileUrlVolumeSeparatorEnd(path, authorityEnd + 2);
-                    if (volumeSeparatorEnd !== -1) {
-                        if (path.charCodeAt(volumeSeparatorEnd) === 47) {
-                            return ~(volumeSeparatorEnd + 1);
-                        }
-                        if (volumeSeparatorEnd === path.length) {
-                            return ~volumeSeparatorEnd;
-                        }
-                    }
-                }
-                return ~(authorityEnd + 1);
-            }
-            return ~path.length;
-        }
-        return 0;
-    }
-    function getRootLength(path) {
-        var rootLength = getEncodedRootLength(path);
-        return rootLength < 0 ? ~rootLength : rootLength;
-    }
-    ts.getRootLength = getRootLength;
-    function normalizePath(path) {
-        return resolvePath(path);
-    }
-    ts.normalizePath = normalizePath;
-    function normalizePathAndParts(path) {
-        path = normalizeSlashes(path);
-        var _a = reducePathComponents(getPathComponents(path)), root = _a[0], parts = _a.slice(1);
-        if (parts.length) {
-            var joinedParts = root + parts.join(ts.directorySeparator);
-            return { path: hasTrailingDirectorySeparator(path) ? ensureTrailingDirectorySeparator(joinedParts) : joinedParts, parts: parts };
-        }
-        else {
-            return { path: root, parts: parts };
-        }
-    }
-    ts.normalizePathAndParts = normalizePathAndParts;
-    function getDirectoryPath(path) {
-        path = normalizeSlashes(path);
-        var rootLength = getRootLength(path);
-        if (rootLength === path.length)
-            return path;
-        path = removeTrailingDirectorySeparator(path);
-        return path.slice(0, Math.max(rootLength, path.lastIndexOf(ts.directorySeparator)));
-    }
-    ts.getDirectoryPath = getDirectoryPath;
-    function isUrl(path) {
-        return getEncodedRootLength(path) < 0;
-    }
-    ts.isUrl = isUrl;
-    function pathIsRelative(path) {
-        return /^\.\.?($|[\\/])/.test(path);
-    }
-    ts.pathIsRelative = pathIsRelative;
-    function isRootedDiskPath(path) {
-        return getEncodedRootLength(path) > 0;
-    }
-    ts.isRootedDiskPath = isRootedDiskPath;
-    function isDiskPathRoot(path) {
-        var rootLength = getEncodedRootLength(path);
-        return rootLength > 0 && rootLength === path.length;
-    }
-    ts.isDiskPathRoot = isDiskPathRoot;
-    function convertToRelativePath(absoluteOrRelativePath, basePath, getCanonicalFileName) {
-        return !isRootedDiskPath(absoluteOrRelativePath)
-            ? absoluteOrRelativePath
-            : getRelativePathToDirectoryOrUrl(basePath, absoluteOrRelativePath, basePath, getCanonicalFileName, false);
-    }
-    ts.convertToRelativePath = convertToRelativePath;
-    function pathComponents(path, rootLength) {
-        var root = path.substring(0, rootLength);
-        var rest = path.substring(rootLength).split(ts.directorySeparator);
-        if (rest.length && !lastOrUndefined(rest))
-            rest.pop();
-        return [root].concat(rest);
-    }
-    function getPathComponents(path, currentDirectory) {
-        if (currentDirectory === void 0) { currentDirectory = ""; }
-        path = combinePaths(currentDirectory, path);
-        var rootLength = getRootLength(path);
-        return pathComponents(path, rootLength);
-    }
-    ts.getPathComponents = getPathComponents;
-    function reducePathComponents(components) {
-        if (!some(components))
-            return [];
-        var reduced = [components[0]];
-        for (var i = 1; i < components.length; i++) {
-            var component = components[i];
-            if (!component)
-                continue;
-            if (component === ".")
-                continue;
-            if (component === "..") {
-                if (reduced.length > 1) {
-                    if (reduced[reduced.length - 1] !== "..") {
-                        reduced.pop();
-                        continue;
-                    }
-                }
-                else if (reduced[0])
-                    continue;
-            }
-            reduced.push(component);
-        }
-        return reduced;
-    }
-    ts.reducePathComponents = reducePathComponents;
-    function getNormalizedPathComponents(path, currentDirectory) {
-        return reducePathComponents(getPathComponents(path, currentDirectory));
-    }
-    ts.getNormalizedPathComponents = getNormalizedPathComponents;
-    function getNormalizedAbsolutePath(fileName, currentDirectory) {
-        return getPathFromPathComponents(getNormalizedPathComponents(fileName, currentDirectory));
-    }
-    ts.getNormalizedAbsolutePath = getNormalizedAbsolutePath;
-    function getPathFromPathComponents(pathComponents) {
-        if (pathComponents.length === 0)
-            return "";
-        var root = pathComponents[0] && ensureTrailingDirectorySeparator(pathComponents[0]);
-        if (pathComponents.length === 1)
-            return root;
-        return root + pathComponents.slice(1).join(ts.directorySeparator);
-    }
-    ts.getPathFromPathComponents = getPathFromPathComponents;
-    function getPathComponentsRelativeTo(from, to, stringEqualityComparer, getCanonicalFileName) {
-        var fromComponents = reducePathComponents(getPathComponents(from));
-        var toComponents = reducePathComponents(getPathComponents(to));
-        var start;
-        for (start = 0; start < fromComponents.length && start < toComponents.length; start++) {
-            var fromComponent = getCanonicalFileName(fromComponents[start]);
-            var toComponent = getCanonicalFileName(toComponents[start]);
-            var comparer = start === 0 ? equateStringsCaseInsensitive : stringEqualityComparer;
-            if (!comparer(fromComponent, toComponent))
-                break;
-        }
-        if (start === 0) {
-            return toComponents;
-        }
-        var components = toComponents.slice(start);
-        var relative = [];
-        for (; start < fromComponents.length; start++) {
-            relative.push("..");
-        }
-        return [""].concat(relative, components);
-    }
-    function getRelativePathFromFile(from, to, getCanonicalFileName) {
-        return ensurePathIsNonModuleName(getRelativePathFromDirectory(getDirectoryPath(from), to, getCanonicalFileName));
-    }
-    ts.getRelativePathFromFile = getRelativePathFromFile;
-    function getRelativePathFromDirectory(fromDirectory, to, getCanonicalFileNameOrIgnoreCase) {
-        Debug.assert((getRootLength(fromDirectory) > 0) === (getRootLength(to) > 0), "Paths must either both be absolute or both be relative");
-        var getCanonicalFileName = typeof getCanonicalFileNameOrIgnoreCase === "function" ? getCanonicalFileNameOrIgnoreCase : identity;
-        var ignoreCase = typeof getCanonicalFileNameOrIgnoreCase === "boolean" ? getCanonicalFileNameOrIgnoreCase : false;
-        var pathComponents = getPathComponentsRelativeTo(fromDirectory, to, ignoreCase ? equateStringsCaseInsensitive : equateStringsCaseSensitive, getCanonicalFileName);
-        return getPathFromPathComponents(pathComponents);
-    }
-    ts.getRelativePathFromDirectory = getRelativePathFromDirectory;
-    function getRelativePathToDirectoryOrUrl(directoryPathOrUrl, relativeOrAbsolutePath, currentDirectory, getCanonicalFileName, isAbsolutePathAnUrl) {
-        var pathComponents = getPathComponentsRelativeTo(resolvePath(currentDirectory, directoryPathOrUrl), resolvePath(currentDirectory, relativeOrAbsolutePath), equateStringsCaseSensitive, getCanonicalFileName);
-        var firstComponent = pathComponents[0];
-        if (isAbsolutePathAnUrl && isRootedDiskPath(firstComponent)) {
-            var prefix = firstComponent.charAt(0) === ts.directorySeparator ? "file://" : "file:///";
-            pathComponents[0] = prefix + firstComponent;
-        }
-        return getPathFromPathComponents(pathComponents);
-    }
-    ts.getRelativePathToDirectoryOrUrl = getRelativePathToDirectoryOrUrl;
-    function ensurePathIsNonModuleName(path) {
-        return getRootLength(path) === 0 && !pathIsRelative(path) ? "./" + path : path;
-    }
-    ts.ensurePathIsNonModuleName = ensurePathIsNonModuleName;
-    function getBaseFileName(path, extensions, ignoreCase) {
-        path = normalizeSlashes(path);
-        var rootLength = getRootLength(path);
-        if (rootLength === path.length)
-            return "";
-        path = removeTrailingDirectorySeparator(path);
-        var name = path.slice(Math.max(getRootLength(path), path.lastIndexOf(ts.directorySeparator) + 1));
-        var extension = extensions !== undefined && ignoreCase !== undefined ? getAnyExtensionFromPath(name, extensions, ignoreCase) : undefined;
-        return extension ? name.slice(0, name.length - extension.length) : name;
-    }
-    ts.getBaseFileName = getBaseFileName;
-    function combinePaths(path) {
-        var paths = [];
-        for (var _i = 1; _i < arguments.length; _i++) {
-            paths[_i - 1] = arguments[_i];
-        }
-        if (path)
-            path = normalizeSlashes(path);
-        for (var _a = 0, paths_1 = paths; _a < paths_1.length; _a++) {
-            var relativePath = paths_1[_a];
-            if (!relativePath)
-                continue;
-            relativePath = normalizeSlashes(relativePath);
-            if (!path || getRootLength(relativePath) !== 0) {
-                path = relativePath;
-            }
-            else {
-                path = ensureTrailingDirectorySeparator(path) + relativePath;
-            }
-        }
-        return path;
-    }
-    ts.combinePaths = combinePaths;
-    function resolvePath(path) {
-        var paths = [];
-        for (var _i = 1; _i < arguments.length; _i++) {
-            paths[_i - 1] = arguments[_i];
-        }
-        var combined = some(paths) ? combinePaths.apply(void 0, [path].concat(paths)) : normalizeSlashes(path);
-        var normalized = getPathFromPathComponents(reducePathComponents(getPathComponents(combined)));
-        return normalized && hasTrailingDirectorySeparator(combined) ? ensureTrailingDirectorySeparator(normalized) : normalized;
-    }
-    ts.resolvePath = resolvePath;
-    function hasTrailingDirectorySeparator(path) {
-        if (path.length === 0)
-            return false;
-        var ch = path.charCodeAt(path.length - 1);
-        return ch === 47 || ch === 92;
-    }
-    ts.hasTrailingDirectorySeparator = hasTrailingDirectorySeparator;
-    function removeTrailingDirectorySeparator(path) {
-        if (hasTrailingDirectorySeparator(path)) {
-            return path.substr(0, path.length - 1);
-        }
-        return path;
-    }
-    ts.removeTrailingDirectorySeparator = removeTrailingDirectorySeparator;
-    function ensureTrailingDirectorySeparator(path) {
-        if (!hasTrailingDirectorySeparator(path)) {
-            return path + ts.directorySeparator;
-        }
-        return path;
-    }
-    ts.ensureTrailingDirectorySeparator = ensureTrailingDirectorySeparator;
-    function comparePathsWorker(a, b, componentComparer) {
-        if (a === b)
-            return 0;
-        if (a === undefined)
-            return -1;
-        if (b === undefined)
-            return 1;
-        var aComponents = reducePathComponents(getPathComponents(a));
-        var bComponents = reducePathComponents(getPathComponents(b));
-        var sharedLength = Math.min(aComponents.length, bComponents.length);
-        for (var i = 0; i < sharedLength; i++) {
-            var stringComparer = i === 0 ? compareStringsCaseInsensitive : componentComparer;
-            var result = stringComparer(aComponents[i], bComponents[i]);
-            if (result !== 0) {
-                return result;
-            }
-        }
-        return compareValues(aComponents.length, bComponents.length);
-    }
-    function comparePathsCaseSensitive(a, b) {
-        return comparePathsWorker(a, b, compareStringsCaseSensitive);
-    }
-    ts.comparePathsCaseSensitive = comparePathsCaseSensitive;
-    function comparePathsCaseInsensitive(a, b) {
-        return comparePathsWorker(a, b, compareStringsCaseInsensitive);
-    }
-    ts.comparePathsCaseInsensitive = comparePathsCaseInsensitive;
-    function comparePaths(a, b, currentDirectory, ignoreCase) {
-        if (typeof currentDirectory === "string") {
-            a = combinePaths(currentDirectory, a);
-            b = combinePaths(currentDirectory, b);
-        }
-        else if (typeof currentDirectory === "boolean") {
-            ignoreCase = currentDirectory;
-        }
-        return comparePathsWorker(a, b, getStringComparer(ignoreCase));
-    }
-    ts.comparePaths = comparePaths;
-    function containsPath(parent, child, currentDirectory, ignoreCase) {
-        if (typeof currentDirectory === "string") {
-            parent = combinePaths(currentDirectory, parent);
-            child = combinePaths(currentDirectory, child);
-        }
-        else if (typeof currentDirectory === "boolean") {
-            ignoreCase = currentDirectory;
-        }
-        if (parent === undefined || child === undefined)
-            return false;
-        if (parent === child)
-            return true;
-        var parentComponents = reducePathComponents(getPathComponents(parent));
-        var childComponents = reducePathComponents(getPathComponents(child));
-        if (childComponents.length < parentComponents.length) {
-            return false;
-        }
-        var componentEqualityComparer = ignoreCase ? equateStringsCaseInsensitive : equateStringsCaseSensitive;
-        for (var i = 0; i < parentComponents.length; i++) {
-            var equalityComparer = i === 0 ? equateStringsCaseInsensitive : componentEqualityComparer;
-            if (!equalityComparer(parentComponents[i], childComponents[i])) {
-                return false;
-            }
-        }
-        return true;
-    }
-    ts.containsPath = containsPath;
-    function startsWith(str, prefix) {
-        return str.lastIndexOf(prefix, 0) === 0;
-    }
-    ts.startsWith = startsWith;
-    function removePrefix(str, prefix) {
-        return startsWith(str, prefix) ? str.substr(prefix.length) : str;
-    }
-    ts.removePrefix = removePrefix;
-    function tryRemovePrefix(str, prefix) {
-        return startsWith(str, prefix) ? str.substring(prefix.length) : undefined;
-    }
-    ts.tryRemovePrefix = tryRemovePrefix;
-    function tryRemoveDirectoryPrefix(path, dirPath) {
-        var a = tryRemovePrefix(path, dirPath);
-        if (a === undefined)
-            return undefined;
-        switch (a.charCodeAt(0)) {
-            case 47:
-            case 92:
-                return a.slice(1);
-            default:
-                return undefined;
-        }
-    }
-    ts.tryRemoveDirectoryPrefix = tryRemoveDirectoryPrefix;
-    function endsWith(str, suffix) {
-        var expectedPos = str.length - suffix.length;
-        return expectedPos >= 0 && str.indexOf(suffix, expectedPos) === expectedPos;
-    }
-    ts.endsWith = endsWith;
-    function removeSuffix(str, suffix) {
-        return endsWith(str, suffix) ? str.slice(0, str.length - suffix.length) : str;
-    }
-    ts.removeSuffix = removeSuffix;
-    function tryRemoveSuffix(str, suffix) {
-        return endsWith(str, suffix) ? str.slice(0, str.length - suffix.length) : undefined;
-    }
-    ts.tryRemoveSuffix = tryRemoveSuffix;
-    function stringContains(str, substring) {
-        return str.indexOf(substring) !== -1;
-    }
-    ts.stringContains = stringContains;
-    function hasExtension(fileName) {
-        return stringContains(getBaseFileName(fileName), ".");
-    }
-    ts.hasExtension = hasExtension;
-    function fileExtensionIs(path, extension) {
-        return path.length > extension.length && endsWith(path, extension);
-    }
-    ts.fileExtensionIs = fileExtensionIs;
-    function fileExtensionIsOneOf(path, extensions) {
-        for (var _i = 0, extensions_1 = extensions; _i < extensions_1.length; _i++) {
-            var extension = extensions_1[_i];
-            if (fileExtensionIs(path, extension)) {
-                return true;
-            }
-        }
-        return false;
-    }
-    ts.fileExtensionIsOneOf = fileExtensionIsOneOf;
-    var reservedCharacterPattern = /[^\w\s\/]/g;
-    var wildcardCharCodes = [42, 63];
-    ts.commonPackageFolders = ["node_modules", "bower_components", "jspm_packages"];
-    var implicitExcludePathRegexPattern = "(?!(" + ts.commonPackageFolders.join("|") + ")(/|$))";
-    var filesMatcher = {
-        singleAsteriskRegexFragment: "([^./]|(\\.(?!min\\.js$))?)*",
-        doubleAsteriskRegexFragment: "(/" + implicitExcludePathRegexPattern + "[^/.][^/]*)*?",
-        replaceWildcardCharacter: function (match) { return replaceWildcardCharacter(match, filesMatcher.singleAsteriskRegexFragment); }
-    };
-    var directoriesMatcher = {
-        singleAsteriskRegexFragment: "[^/]*",
-        doubleAsteriskRegexFragment: "(/" + implicitExcludePathRegexPattern + "[^/.][^/]*)*?",
-        replaceWildcardCharacter: function (match) { return replaceWildcardCharacter(match, directoriesMatcher.singleAsteriskRegexFragment); }
-    };
-    var excludeMatcher = {
-        singleAsteriskRegexFragment: "[^/]*",
-        doubleAsteriskRegexFragment: "(/.+?)?",
-        replaceWildcardCharacter: function (match) { return replaceWildcardCharacter(match, excludeMatcher.singleAsteriskRegexFragment); }
-    };
-    var wildcardMatchers = {
-        files: filesMatcher,
-        directories: directoriesMatcher,
-        exclude: excludeMatcher
-    };
-    function getRegularExpressionForWildcard(specs, basePath, usage) {
-        var patterns = getRegularExpressionsForWildcards(specs, basePath, usage);
-        if (!patterns || !patterns.length) {
-            return undefined;
-        }
-        var pattern = patterns.map(function (pattern) { return "(" + pattern + ")"; }).join("|");
-        var terminator = usage === "exclude" ? "($|/)" : "$";
-        return "^(" + pattern + ")" + terminator;
-    }
-    ts.getRegularExpressionForWildcard = getRegularExpressionForWildcard;
-    function getRegularExpressionsForWildcards(specs, basePath, usage) {
-        if (specs === undefined || specs.length === 0) {
-            return undefined;
-        }
-        return flatMap(specs, function (spec) {
-            return spec && getSubPatternFromSpec(spec, basePath, usage, wildcardMatchers[usage]);
-        });
-    }
-    function isImplicitGlob(lastPathComponent) {
-        return !/[.*?]/.test(lastPathComponent);
-    }
-    ts.isImplicitGlob = isImplicitGlob;
-    function getSubPatternFromSpec(spec, basePath, usage, _a) {
-        var singleAsteriskRegexFragment = _a.singleAsteriskRegexFragment, doubleAsteriskRegexFragment = _a.doubleAsteriskRegexFragment, replaceWildcardCharacter = _a.replaceWildcardCharacter;
-        var subpattern = "";
-        var hasWrittenComponent = false;
-        var components = getNormalizedPathComponents(spec, basePath);
-        var lastComponent = last(components);
-        if (usage !== "exclude" && lastComponent === "**") {
-            return undefined;
-        }
-        components[0] = removeTrailingDirectorySeparator(components[0]);
-        if (isImplicitGlob(lastComponent)) {
-            components.push("**", "*");
-        }
-        var optionalCount = 0;
-        for (var _i = 0, components_1 = components; _i < components_1.length; _i++) {
-            var component = components_1[_i];
-            if (component === "**") {
-                subpattern += doubleAsteriskRegexFragment;
-            }
-            else {
-                if (usage === "directories") {
-                    subpattern += "(";
-                    optionalCount++;
-                }
-                if (hasWrittenComponent) {
-                    subpattern += ts.directorySeparator;
-                }
-                if (usage !== "exclude") {
-                    var componentPattern = "";
-                    if (component.charCodeAt(0) === 42) {
-                        componentPattern += "([^./]" + singleAsteriskRegexFragment + ")?";
-                        component = component.substr(1);
-                    }
-                    else if (component.charCodeAt(0) === 63) {
-                        componentPattern += "[^./]";
-                        component = component.substr(1);
-                    }
-                    componentPattern += component.replace(reservedCharacterPattern, replaceWildcardCharacter);
-                    if (componentPattern !== component) {
-                        subpattern += implicitExcludePathRegexPattern;
-                    }
-                    subpattern += componentPattern;
-                }
-                else {
-                    subpattern += component.replace(reservedCharacterPattern, replaceWildcardCharacter);
-                }
-            }
-            hasWrittenComponent = true;
-        }
-        while (optionalCount > 0) {
-            subpattern += ")?";
-            optionalCount--;
-        }
-        return subpattern;
-    }
-    function replaceWildcardCharacter(match, singleAsteriskRegexFragment) {
-        return match === "*" ? singleAsteriskRegexFragment : match === "?" ? "[^/]" : "\\" + match;
-    }
-    function getFileMatcherPatterns(path, excludes, includes, useCaseSensitiveFileNames, currentDirectory) {
-        path = normalizePath(path);
-        currentDirectory = normalizePath(currentDirectory);
-        var absolutePath = combinePaths(currentDirectory, path);
-        return {
-            includeFilePatterns: map(getRegularExpressionsForWildcards(includes, absolutePath, "files"), function (pattern) { return "^" + pattern + "$"; }),
-            includeFilePattern: getRegularExpressionForWildcard(includes, absolutePath, "files"),
-            includeDirectoryPattern: getRegularExpressionForWildcard(includes, absolutePath, "directories"),
-            excludePattern: getRegularExpressionForWildcard(excludes, absolutePath, "exclude"),
-            basePaths: getBasePaths(path, includes, useCaseSensitiveFileNames)
-        };
-    }
-    ts.getFileMatcherPatterns = getFileMatcherPatterns;
-    function getRegexFromPattern(pattern, useCaseSensitiveFileNames) {
-        return new RegExp(pattern, useCaseSensitiveFileNames ? "" : "i");
-    }
-    ts.getRegexFromPattern = getRegexFromPattern;
-    function matchFiles(path, extensions, excludes, includes, useCaseSensitiveFileNames, currentDirectory, depth, getFileSystemEntries) {
-        path = normalizePath(path);
-        currentDirectory = normalizePath(currentDirectory);
-        var patterns = getFileMatcherPatterns(path, excludes, includes, useCaseSensitiveFileNames, currentDirectory);
-        var includeFileRegexes = patterns.includeFilePatterns && patterns.includeFilePatterns.map(function (pattern) { return getRegexFromPattern(pattern, useCaseSensitiveFileNames); });
-        var includeDirectoryRegex = patterns.includeDirectoryPattern && getRegexFromPattern(patterns.includeDirectoryPattern, useCaseSensitiveFileNames);
-        var excludeRegex = patterns.excludePattern && getRegexFromPattern(patterns.excludePattern, useCaseSensitiveFileNames);
-        var results = includeFileRegexes ? includeFileRegexes.map(function () { return []; }) : [[]];
-        for (var _i = 0, _a = patterns.basePaths; _i < _a.length; _i++) {
-            var basePath = _a[_i];
-            visitDirectory(basePath, combinePaths(currentDirectory, basePath), depth);
-        }
-        return flatten(results);
-        function visitDirectory(path, absolutePath, depth) {
-            var _a = getFileSystemEntries(path), files = _a.files, directories = _a.directories;
-            var _loop_1 = function (current) {
-                var name = combinePaths(path, current);
-                var absoluteName = combinePaths(absolutePath, current);
-                if (extensions && !fileExtensionIsOneOf(name, extensions))
-                    return "continue";
-                if (excludeRegex && excludeRegex.test(absoluteName))
-                    return "continue";
-                if (!includeFileRegexes) {
-                    results[0].push(name);
-                }
-                else {
-                    var includeIndex = findIndex(includeFileRegexes, function (re) { return re.test(absoluteName); });
-                    if (includeIndex !== -1) {
-                        results[includeIndex].push(name);
-                    }
-                }
-            };
-            for (var _i = 0, _b = sort(files, compareStringsCaseSensitive); _i < _b.length; _i++) {
-                var current = _b[_i];
-                _loop_1(current);
-            }
-            if (depth !== undefined) {
-                depth--;
-                if (depth === 0) {
-                    return;
-                }
-            }
-            for (var _c = 0, _d = sort(directories, compareStringsCaseSensitive); _c < _d.length; _c++) {
-                var current = _d[_c];
-                var name = combinePaths(path, current);
-                var absoluteName = combinePaths(absolutePath, current);
-                if ((!includeDirectoryRegex || includeDirectoryRegex.test(absoluteName)) &&
-                    (!excludeRegex || !excludeRegex.test(absoluteName))) {
-                    visitDirectory(name, absoluteName, depth);
-                }
-            }
-        }
-    }
-    ts.matchFiles = matchFiles;
-    function getBasePaths(path, includes, useCaseSensitiveFileNames) {
-        var basePaths = [path];
-        if (includes) {
-            var includeBasePaths = [];
-            for (var _i = 0, includes_1 = includes; _i < includes_1.length; _i++) {
-                var include = includes_1[_i];
-                var absolute = isRootedDiskPath(include) ? include : normalizePath(combinePaths(path, include));
-                includeBasePaths.push(getIncludeBasePath(absolute));
-            }
-            includeBasePaths.sort(getStringComparer(!useCaseSensitiveFileNames));
-            var _loop_2 = function (includeBasePath) {
-                if (every(basePaths, function (basePath) { return !containsPath(basePath, includeBasePath, path, !useCaseSensitiveFileNames); })) {
-                    basePaths.push(includeBasePath);
-                }
-            };
-            for (var _a = 0, includeBasePaths_1 = includeBasePaths; _a < includeBasePaths_1.length; _a++) {
-                var includeBasePath = includeBasePaths_1[_a];
-                _loop_2(includeBasePath);
-            }
-        }
-        return basePaths;
-    }
-    function getIncludeBasePath(absolute) {
-        var wildcardOffset = indexOfAnyCharCode(absolute, wildcardCharCodes);
-        if (wildcardOffset < 0) {
-            return !hasExtension(absolute)
-                ? absolute
-                : removeTrailingDirectorySeparator(getDirectoryPath(absolute));
-        }
-        return absolute.substring(0, absolute.lastIndexOf(ts.directorySeparator, wildcardOffset));
-    }
-    function ensureScriptKind(fileName, scriptKind) {
-        return scriptKind || getScriptKindFromFileName(fileName) || 3;
-    }
-    ts.ensureScriptKind = ensureScriptKind;
-    function getScriptKindFromFileName(fileName) {
-        var ext = fileName.substr(fileName.lastIndexOf("."));
-        switch (ext.toLowerCase()) {
-            case ".js":
-                return 1;
-            case ".jsx":
-                return 2;
-            case ".ts":
-                return 3;
-            case ".tsx":
-                return 4;
-            case ".json":
-                return 6;
-            default:
-                return 0;
-        }
-    }
-    ts.getScriptKindFromFileName = getScriptKindFromFileName;
-    ts.supportedTypeScriptExtensions = [".ts", ".tsx", ".d.ts"];
-    ts.supportedTypescriptExtensionsForExtractExtension = [".d.ts", ".ts", ".tsx"];
-    ts.supportedJavascriptExtensions = [".js", ".jsx"];
-    var allSupportedExtensions = ts.supportedTypeScriptExtensions.concat(ts.supportedJavascriptExtensions);
-    function getSupportedExtensions(options, extraFileExtensions) {
-        var needJsExtensions = options && options.allowJs;
-        if (!extraFileExtensions || extraFileExtensions.length === 0) {
-            return needJsExtensions ? allSupportedExtensions : ts.supportedTypeScriptExtensions;
-        }
-        var extensions = (needJsExtensions ? allSupportedExtensions : ts.supportedTypeScriptExtensions).concat(mapDefined(extraFileExtensions, function (x) { return x.scriptKind === 7 || needJsExtensions && isJavaScriptLike(x.scriptKind) ? x.extension : undefined; }));
-        return deduplicate(extensions, equateStringsCaseSensitive, compareStringsCaseSensitive);
-    }
-    ts.getSupportedExtensions = getSupportedExtensions;
-    function isJavaScriptLike(scriptKind) {
-        return scriptKind === 1 || scriptKind === 2;
-    }
-    function hasJavaScriptFileExtension(fileName) {
-        return some(ts.supportedJavascriptExtensions, function (extension) { return fileExtensionIs(fileName, extension); });
-    }
-    ts.hasJavaScriptFileExtension = hasJavaScriptFileExtension;
-    function hasTypeScriptFileExtension(fileName) {
-        return some(ts.supportedTypeScriptExtensions, function (extension) { return fileExtensionIs(fileName, extension); });
-    }
-    ts.hasTypeScriptFileExtension = hasTypeScriptFileExtension;
-    function isSupportedSourceFileName(fileName, compilerOptions, extraFileExtensions) {
-        if (!fileName) {
-            return false;
-        }
-        for (var _i = 0, _a = getSupportedExtensions(compilerOptions, extraFileExtensions); _i < _a.length; _i++) {
-            var extension = _a[_i];
-            if (fileExtensionIs(fileName, extension)) {
-                return true;
-            }
-        }
-        return false;
-    }
-    ts.isSupportedSourceFileName = isSupportedSourceFileName;
-    var ExtensionPriority;
-    (function (ExtensionPriority) {
-        ExtensionPriority[ExtensionPriority["TypeScriptFiles"] = 0] = "TypeScriptFiles";
-        ExtensionPriority[ExtensionPriority["DeclarationAndJavaScriptFiles"] = 2] = "DeclarationAndJavaScriptFiles";
-        ExtensionPriority[ExtensionPriority["Highest"] = 0] = "Highest";
-        ExtensionPriority[ExtensionPriority["Lowest"] = 2] = "Lowest";
-    })(ExtensionPriority = ts.ExtensionPriority || (ts.ExtensionPriority = {}));
-    function getExtensionPriority(path, supportedExtensions) {
-        for (var i = supportedExtensions.length - 1; i >= 0; i--) {
-            if (fileExtensionIs(path, supportedExtensions[i])) {
-                return adjustExtensionPriority(i, supportedExtensions);
-            }
-        }
-        return 0;
-    }
-    ts.getExtensionPriority = getExtensionPriority;
-    function adjustExtensionPriority(extensionPriority, supportedExtensions) {
-        if (extensionPriority < 2) {
-            return 0;
-        }
-        else if (extensionPriority < supportedExtensions.length) {
-            return 2;
-        }
-        else {
-            return supportedExtensions.length;
-        }
-    }
-    ts.adjustExtensionPriority = adjustExtensionPriority;
-    function getNextLowestExtensionPriority(extensionPriority, supportedExtensions) {
-        if (extensionPriority < 2) {
-            return 2;
-        }
-        else {
-            return supportedExtensions.length;
-        }
-    }
-    ts.getNextLowestExtensionPriority = getNextLowestExtensionPriority;
-    var extensionsToRemove = [".d.ts", ".ts", ".js", ".tsx", ".jsx", ".json"];
-    function removeFileExtension(path) {
-        for (var _i = 0, extensionsToRemove_1 = extensionsToRemove; _i < extensionsToRemove_1.length; _i++) {
-            var ext = extensionsToRemove_1[_i];
-            var extensionless = tryRemoveExtension(path, ext);
-            if (extensionless !== undefined) {
-                return extensionless;
-            }
-        }
-        return path;
-    }
-    ts.removeFileExtension = removeFileExtension;
-    function tryRemoveExtension(path, extension) {
-        return fileExtensionIs(path, extension) ? removeExtension(path, extension) : undefined;
-    }
-    ts.tryRemoveExtension = tryRemoveExtension;
-    function removeExtension(path, extension) {
-        return path.substring(0, path.length - extension.length);
-    }
-    ts.removeExtension = removeExtension;
-    function changeExtension(path, newExtension) {
-        return changeAnyExtension(path, newExtension, extensionsToRemove, false);
-    }
-    ts.changeExtension = changeExtension;
-    function changeAnyExtension(path, ext, extensions, ignoreCase) {
-        var pathext = extensions !== undefined && ignoreCase !== undefined ? getAnyExtensionFromPath(path, extensions, ignoreCase) : getAnyExtensionFromPath(path);
-        return pathext ? path.slice(0, path.length - pathext.length) + (startsWith(ext, ".") ? ext : "." + ext) : path;
-    }
-    ts.changeAnyExtension = changeAnyExtension;
-    function removeMinAndVersionNumbers(fileName) {
-        var trailingMinOrVersion = /[.-]((min)|(\d+(\.\d+)*))$/;
-        return fileName.replace(trailingMinOrVersion, "").replace(trailingMinOrVersion, "");
-    }
-    ts.removeMinAndVersionNumbers = removeMinAndVersionNumbers;
-    function Symbol(flags, name) {
-        this.flags = flags;
-        this.escapedName = name;
-        this.declarations = undefined;
-        this.valueDeclaration = undefined;
-        this.id = undefined;
-        this.mergeId = undefined;
-        this.parent = undefined;
-    }
-    function Type(checker, flags) {
-        this.flags = flags;
-        if (Debug.isDebugging) {
-            this.checker = checker;
-        }
-    }
-    function Signature() { }
-    function Node(kind, pos, end) {
-        this.pos = pos;
-        this.end = end;
-        this.kind = kind;
-        this.id = 0;
-        this.flags = 0;
-        this.modifierFlagsCache = 0;
-        this.transformFlags = 0;
-        this.parent = undefined;
-        this.original = undefined;
-    }
-    function SourceMapSource(fileName, text, skipTrivia) {
-        this.fileName = fileName;
-        this.text = text;
-        this.skipTrivia = skipTrivia || (function (pos) { return pos; });
-    }
-    ts.objectAllocator = {
-        getNodeConstructor: function () { return Node; },
-        getTokenConstructor: function () { return Node; },
-        getIdentifierConstructor: function () { return Node; },
-        getSourceFileConstructor: function () { return Node; },
-        getSymbolConstructor: function () { return Symbol; },
-        getTypeConstructor: function () { return Type; },
-        getSignatureConstructor: function () { return Signature; },
-        getSourceMapSourceConstructor: function () { return SourceMapSource; },
-    };
     var AssertionLevel;
     (function (AssertionLevel) {
         AssertionLevel[AssertionLevel["None"] = 0] = "None";
@@ -3786,7 +1439,7 @@ var ts;
     })(AssertionLevel = ts.AssertionLevel || (ts.AssertionLevel = {}));
     var Debug;
     (function (Debug) {
-        Debug.currentAssertionLevel = 0;
+        Debug.currentAssertionLevel = 0 /* None */;
         Debug.isDebugging = false;
         function shouldAssert(level) {
             return Debug.currentAssertionLevel >= level;
@@ -3867,27 +1520,350 @@ var ts;
             }
         }
         Debug.getFunctionName = getFunctionName;
-        function showSymbol(symbol) {
-            var symbolFlags = ts.SymbolFlags;
-            return "{ flags: " + (symbolFlags ? showFlags(symbol.flags, symbolFlags) : symbol.flags) + "; declarations: " + map(symbol.declarations, showSyntaxKind) + " }";
+    })(Debug = ts.Debug || (ts.Debug = {}));
+    function equateValues(a, b) {
+        return a === b;
+    }
+    ts.equateValues = equateValues;
+    /**
+     * Compare the equality of two strings using a case-sensitive ordinal comparison.
+     *
+     * Case-sensitive comparisons compare both strings one code-point at a time using the integer
+     * value of each code-point after applying `toUpperCase` to each string. We always map both
+     * strings to their upper-case form as some unicode characters do not properly round-trip to
+     * lowercase (such as `ẞ` (German sharp capital s)).
+     */
+    function equateStringsCaseInsensitive(a, b) {
+        return a === b
+            || a !== undefined
+                && b !== undefined
+                && a.toUpperCase() === b.toUpperCase();
+    }
+    ts.equateStringsCaseInsensitive = equateStringsCaseInsensitive;
+    /**
+     * Compare the equality of two strings using a case-sensitive ordinal comparison.
+     *
+     * Case-sensitive comparisons compare both strings one code-point at a time using the
+     * integer value of each code-point.
+     */
+    function equateStringsCaseSensitive(a, b) {
+        return equateValues(a, b);
+    }
+    ts.equateStringsCaseSensitive = equateStringsCaseSensitive;
+    function compareComparableValues(a, b) {
+        return a === b ? 0 /* EqualTo */ :
+            a === undefined ? -1 /* LessThan */ :
+                b === undefined ? 1 /* GreaterThan */ :
+                    a < b ? -1 /* LessThan */ :
+                        1 /* GreaterThan */;
+    }
+    /**
+     * Compare two numeric values for their order relative to each other.
+     * To compare strings, use any of the `compareStrings` functions.
+     */
+    function compareValues(a, b) {
+        return compareComparableValues(a, b);
+    }
+    ts.compareValues = compareValues;
+    function min(a, b, compare) {
+        return compare(a, b) === -1 /* LessThan */ ? a : b;
+    }
+    ts.min = min;
+    /**
+     * Compare two strings using a case-insensitive ordinal comparison.
+     *
+     * Ordinal comparisons are based on the difference between the unicode code points of both
+     * strings. Characters with multiple unicode representations are considered unequal. Ordinal
+     * comparisons provide predictable ordering, but place "a" after "B".
+     *
+     * Case-insensitive comparisons compare both strings one code-point at a time using the integer
+     * value of each code-point after applying `toUpperCase` to each string. We always map both
+     * strings to their upper-case form as some unicode characters do not properly round-trip to
+     * lowercase (such as `ẞ` (German sharp capital s)).
+     */
+    function compareStringsCaseInsensitive(a, b) {
+        if (a === b)
+            return 0 /* EqualTo */;
+        if (a === undefined)
+            return -1 /* LessThan */;
+        if (b === undefined)
+            return 1 /* GreaterThan */;
+        a = a.toUpperCase();
+        b = b.toUpperCase();
+        return a < b ? -1 /* LessThan */ : a > b ? 1 /* GreaterThan */ : 0 /* EqualTo */;
+    }
+    ts.compareStringsCaseInsensitive = compareStringsCaseInsensitive;
+    /**
+     * Compare two strings using a case-sensitive ordinal comparison.
+     *
+     * Ordinal comparisons are based on the difference between the unicode code points of both
+     * strings. Characters with multiple unicode representations are considered unequal. Ordinal
+     * comparisons provide predictable ordering, but place "a" after "B".
+     *
+     * Case-sensitive comparisons compare both strings one code-point at a time using the integer
+     * value of each code-point.
+     */
+    function compareStringsCaseSensitive(a, b) {
+        return compareComparableValues(a, b);
+    }
+    ts.compareStringsCaseSensitive = compareStringsCaseSensitive;
+    function getStringComparer(ignoreCase) {
+        return ignoreCase ? compareStringsCaseInsensitive : compareStringsCaseSensitive;
+    }
+    ts.getStringComparer = getStringComparer;
+    /**
+     * Creates a string comparer for use with string collation in the UI.
+     */
+    var createUIStringComparer = (function () {
+        var defaultComparer;
+        var enUSComparer;
+        var stringComparerFactory = getStringComparerFactory();
+        return createStringComparer;
+        function compareWithCallback(a, b, comparer) {
+            if (a === b)
+                return 0 /* EqualTo */;
+            if (a === undefined)
+                return -1 /* LessThan */;
+            if (b === undefined)
+                return 1 /* GreaterThan */;
+            var value = comparer(a, b);
+            return value < 0 ? -1 /* LessThan */ : value > 0 ? 1 /* GreaterThan */ : 0 /* EqualTo */;
         }
-        Debug.showSymbol = showSymbol;
-        function showFlags(flags, flagsEnum) {
-            var out = [];
-            for (var pow = 0; pow <= 30; pow++) {
-                var n = 1 << pow;
-                if (flags & n) {
-                    out.push(flagsEnum[n]);
+        function createIntlCollatorStringComparer(locale) {
+            // Intl.Collator.prototype.compare is bound to the collator. See NOTE in
+            // http://www.ecma-international.org/ecma-402/2.0/#sec-Intl.Collator.prototype.compare
+            var comparer = new Intl.Collator(locale, { usage: "sort", sensitivity: "variant" }).compare;
+            return function (a, b) { return compareWithCallback(a, b, comparer); };
+        }
+        function createLocaleCompareStringComparer(locale) {
+            // if the locale is not the default locale (`undefined`), use the fallback comparer.
+            if (locale !== undefined)
+                return createFallbackStringComparer();
+            return function (a, b) { return compareWithCallback(a, b, compareStrings); };
+            function compareStrings(a, b) {
+                return a.localeCompare(b);
+            }
+        }
+        function createFallbackStringComparer() {
+            // An ordinal comparison puts "A" after "b", but for the UI we want "A" before "b".
+            // We first sort case insensitively.  So "Aaa" will come before "baa".
+            // Then we sort case sensitively, so "aaa" will come before "Aaa".
+            //
+            // For case insensitive comparisons we always map both strings to their
+            // upper-case form as some unicode characters do not properly round-trip to
+            // lowercase (such as `ẞ` (German sharp capital s)).
+            return function (a, b) { return compareWithCallback(a, b, compareDictionaryOrder); };
+            function compareDictionaryOrder(a, b) {
+                return compareStrings(a.toUpperCase(), b.toUpperCase()) || compareStrings(a, b);
+            }
+            function compareStrings(a, b) {
+                return a < b ? -1 /* LessThan */ : a > b ? 1 /* GreaterThan */ : 0 /* EqualTo */;
+            }
+        }
+        function getStringComparerFactory() {
+            // If the host supports Intl, we use it for comparisons using the default locale.
+            if (typeof Intl === "object" && typeof Intl.Collator === "function") {
+                return createIntlCollatorStringComparer;
+            }
+            // If the host does not support Intl, we fall back to localeCompare.
+            // localeCompare in Node v0.10 is just an ordinal comparison, so don't use it.
+            if (typeof String.prototype.localeCompare === "function" &&
+                typeof String.prototype.toLocaleUpperCase === "function" &&
+                "a".localeCompare("B") < 0) {
+                return createLocaleCompareStringComparer;
+            }
+            // Otherwise, fall back to ordinal comparison:
+            return createFallbackStringComparer;
+        }
+        function createStringComparer(locale) {
+            // Hold onto common string comparers. This avoids constantly reallocating comparers during
+            // tests.
+            if (locale === undefined) {
+                return defaultComparer || (defaultComparer = stringComparerFactory(locale));
+            }
+            else if (locale === "en-US") {
+                return enUSComparer || (enUSComparer = stringComparerFactory(locale));
+            }
+            else {
+                return stringComparerFactory(locale);
+            }
+        }
+    })();
+    var uiComparerCaseSensitive;
+    var uiLocale;
+    function getUILocale() {
+        return uiLocale;
+    }
+    ts.getUILocale = getUILocale;
+    function setUILocale(value) {
+        if (uiLocale !== value) {
+            uiLocale = value;
+            uiComparerCaseSensitive = undefined;
+        }
+    }
+    ts.setUILocale = setUILocale;
+    /**
+     * Compare two strings in a using the case-sensitive sort behavior of the UI locale.
+     *
+     * Ordering is not predictable between different host locales, but is best for displaying
+     * ordered data for UI presentation. Characters with multiple unicode representations may
+     * be considered equal.
+     *
+     * Case-sensitive comparisons compare strings that differ in base characters, or
+     * accents/diacritic marks, or case as unequal.
+     */
+    function compareStringsCaseSensitiveUI(a, b) {
+        var comparer = uiComparerCaseSensitive || (uiComparerCaseSensitive = createUIStringComparer(uiLocale));
+        return comparer(a, b);
+    }
+    ts.compareStringsCaseSensitiveUI = compareStringsCaseSensitiveUI;
+    function compareProperties(a, b, key, comparer) {
+        return a === b ? 0 /* EqualTo */ :
+            a === undefined ? -1 /* LessThan */ :
+                b === undefined ? 1 /* GreaterThan */ :
+                    comparer(a[key], b[key]);
+    }
+    ts.compareProperties = compareProperties;
+    /** True is greater than false. */
+    function compareBooleans(a, b) {
+        return compareValues(a ? 1 : 0, b ? 1 : 0);
+    }
+    ts.compareBooleans = compareBooleans;
+    /**
+     * Given a name and a list of names that are *not* equal to the name, return a spelling suggestion if there is one that is close enough.
+     * Names less than length 3 only check for case-insensitive equality, not Levenshtein distance.
+     *
+     * If there is a candidate that's the same except for case, return that.
+     * If there is a candidate that's within one edit of the name, return that.
+     * Otherwise, return the candidate with the smallest Levenshtein distance,
+     *    except for candidates:
+     *      * With no name
+     *      * Whose length differs from the target name by more than 0.34 of the length of the name.
+     *      * Whose levenshtein distance is more than 0.4 of the length of the name
+     *        (0.4 allows 1 substitution/transposition for every 5 characters,
+     *         and 1 insertion/deletion at 3 characters)
+     */
+    function getSpellingSuggestion(name, candidates, getName) {
+        var maximumLengthDifference = Math.min(2, Math.floor(name.length * 0.34));
+        var bestDistance = Math.floor(name.length * 0.4) + 1; // If the best result isn't better than this, don't bother.
+        var bestCandidate;
+        var justCheckExactMatches = false;
+        var nameLowerCase = name.toLowerCase();
+        for (var _i = 0, candidates_1 = candidates; _i < candidates_1.length; _i++) {
+            var candidate = candidates_1[_i];
+            var candidateName = getName(candidate);
+            if (candidateName !== undefined && Math.abs(candidateName.length - nameLowerCase.length) <= maximumLengthDifference) {
+                var candidateNameLowerCase = candidateName.toLowerCase();
+                if (candidateNameLowerCase === nameLowerCase) {
+                    return candidate;
+                }
+                if (justCheckExactMatches) {
+                    continue;
+                }
+                if (candidateName.length < 3) {
+                    // Don't bother, user would have noticed a 2-character name having an extra character
+                    continue;
+                }
+                // Only care about a result better than the best so far.
+                var distance = levenshteinWithMax(nameLowerCase, candidateNameLowerCase, bestDistance - 1);
+                if (distance === undefined) {
+                    continue;
+                }
+                if (distance < 3) {
+                    justCheckExactMatches = true;
+                    bestCandidate = candidate;
+                }
+                else {
+                    Debug.assert(distance < bestDistance); // Else `levenshteinWithMax` should return undefined
+                    bestDistance = distance;
+                    bestCandidate = candidate;
                 }
             }
-            return out.join("|");
         }
-        function showSyntaxKind(node) {
-            var syntaxKind = ts.SyntaxKind;
-            return syntaxKind ? syntaxKind[node.kind] : node.kind.toString();
+        return bestCandidate;
+    }
+    ts.getSpellingSuggestion = getSpellingSuggestion;
+    function levenshteinWithMax(s1, s2, max) {
+        var previous = new Array(s2.length + 1);
+        var current = new Array(s2.length + 1);
+        /** Represents any value > max. We don't care about the particular value. */
+        var big = max + 1;
+        for (var i = 0; i <= s2.length; i++) {
+            previous[i] = i;
         }
-        Debug.showSyntaxKind = showSyntaxKind;
-    })(Debug = ts.Debug || (ts.Debug = {}));
+        for (var i = 1; i <= s1.length; i++) {
+            var c1 = s1.charCodeAt(i - 1);
+            var minJ = i > max ? i - max : 1;
+            var maxJ = s2.length > max + i ? max + i : s2.length;
+            current[0] = i;
+            /** Smallest value of the matrix in the ith column. */
+            var colMin = i;
+            for (var j = 1; j < minJ; j++) {
+                current[j] = big;
+            }
+            for (var j = minJ; j <= maxJ; j++) {
+                var dist = c1 === s2.charCodeAt(j - 1)
+                    ? previous[j - 1]
+                    : Math.min(/*delete*/ previous[j] + 1, /*insert*/ current[j - 1] + 1, /*substitute*/ previous[j - 1] + 2);
+                current[j] = dist;
+                colMin = Math.min(colMin, dist);
+            }
+            for (var j = maxJ + 1; j <= s2.length; j++) {
+                current[j] = big;
+            }
+            if (colMin > max) {
+                // Give up -- everything in this column is > max and it can't get better in future columns.
+                return undefined;
+            }
+            var temp = previous;
+            previous = current;
+            current = temp;
+        }
+        var res = previous[s2.length];
+        return res > max ? undefined : res;
+    }
+    function endsWith(str, suffix) {
+        var expectedPos = str.length - suffix.length;
+        return expectedPos >= 0 && str.indexOf(suffix, expectedPos) === expectedPos;
+    }
+    ts.endsWith = endsWith;
+    function removeSuffix(str, suffix) {
+        return endsWith(str, suffix) ? str.slice(0, str.length - suffix.length) : str;
+    }
+    ts.removeSuffix = removeSuffix;
+    function tryRemoveSuffix(str, suffix) {
+        return endsWith(str, suffix) ? str.slice(0, str.length - suffix.length) : undefined;
+    }
+    ts.tryRemoveSuffix = tryRemoveSuffix;
+    function stringContains(str, substring) {
+        return str.indexOf(substring) !== -1;
+    }
+    ts.stringContains = stringContains;
+    function fileExtensionIs(path, extension) {
+        return path.length > extension.length && endsWith(path, extension);
+    }
+    ts.fileExtensionIs = fileExtensionIs;
+    function fileExtensionIsOneOf(path, extensions) {
+        for (var _i = 0, extensions_1 = extensions; _i < extensions_1.length; _i++) {
+            var extension = extensions_1[_i];
+            if (fileExtensionIs(path, extension)) {
+                return true;
+            }
+        }
+        return false;
+    }
+    ts.fileExtensionIsOneOf = fileExtensionIsOneOf;
+    /**
+     * Takes a string like "jquery-min.4.2.3" and returns "jquery"
+     */
+    function removeMinAndVersionNumbers(fileName) {
+        // Match a "." or "-" followed by a version number or 'min' at the end of the name
+        var trailingMinOrVersion = /[.-]((min)|(\d+(\.\d+)*))$/;
+        // The "min" or version may both be present, in either order, so try applying the above twice.
+        return fileName.replace(trailingMinOrVersion, "").replace(trailingMinOrVersion, "");
+    }
+    ts.removeMinAndVersionNumbers = removeMinAndVersionNumbers;
+    /** Remove an item from an array, moving everything to its right one space left. */
     function orderedRemoveItem(array, item) {
         for (var i = 0; i < array.length; i++) {
             if (array[i] === item) {
@@ -3898,7 +1874,9 @@ var ts;
         return false;
     }
     ts.orderedRemoveItem = orderedRemoveItem;
+    /** Remove an item by index from an array, moving everything to its right one space left. */
     function orderedRemoveItemAt(array, index) {
+        // This seems to be faster than either `array.splice(i, 1)` or `array.copyWithin(i, i+ 1)`.
         for (var i = index; i < array.length - 1; i++) {
             array[i] = array[i + 1];
         }
@@ -3906,14 +1884,17 @@ var ts;
     }
     ts.orderedRemoveItemAt = orderedRemoveItemAt;
     function unorderedRemoveItemAt(array, index) {
+        // Fill in the "hole" left at `index`.
         array[index] = array[array.length - 1];
         array.pop();
     }
     ts.unorderedRemoveItemAt = unorderedRemoveItemAt;
+    /** Remove the *first* occurrence of `item` from the array. */
     function unorderedRemoveItem(array, item) {
         return unorderedRemoveFirstItemWhere(array, function (element) { return element === item; });
     }
     ts.unorderedRemoveItem = unorderedRemoveItem;
+    /** Remove the *first* element satisfying `predicate`. */
     function unorderedRemoveFirstItemWhere(array, predicate) {
         for (var i = 0; i < array.length; i++) {
             if (predicate(array[i])) {
@@ -3927,33 +1908,24 @@ var ts;
         return useCaseSensitiveFileNames ? identity : toLowerCase;
     }
     ts.createGetCanonicalFileName = createGetCanonicalFileName;
-    function matchPatternOrExact(patternStrings, candidate) {
-        var patterns = [];
-        for (var _i = 0, patternStrings_1 = patternStrings; _i < patternStrings_1.length; _i++) {
-            var patternString = patternStrings_1[_i];
-            var pattern = tryParsePattern(patternString);
-            if (pattern) {
-                patterns.push(pattern);
-            }
-            else if (patternString === candidate) {
-                return patternString;
-            }
-        }
-        return findBestPatternMatch(patterns, function (_) { return _; }, candidate);
-    }
-    ts.matchPatternOrExact = matchPatternOrExact;
     function patternText(_a) {
         var prefix = _a.prefix, suffix = _a.suffix;
         return prefix + "*" + suffix;
     }
     ts.patternText = patternText;
+    /**
+     * Given that candidate matches pattern, returns the text matching the '*'.
+     * E.g.: matchedText(tryParsePattern("foo*baz"), "foobarbaz") === "bar"
+     */
     function matchedText(pattern, candidate) {
         Debug.assert(isPatternMatch(pattern, candidate));
         return candidate.substring(pattern.prefix.length, candidate.length - pattern.suffix.length);
     }
     ts.matchedText = matchedText;
+    /** Return the object corresponding to the best pattern to match `candidate`. */
     function findBestPatternMatch(values, getPattern, candidate) {
         var matchedValue;
+        // use length of prefix as betterness criteria
         var longestMatchPrefixLength = -1;
         for (var _i = 0, values_2 = values; _i < values_2.length; _i++) {
             var v = values_2[_i];
@@ -3966,78 +1938,24 @@ var ts;
         return matchedValue;
     }
     ts.findBestPatternMatch = findBestPatternMatch;
+    function startsWith(str, prefix) {
+        return str.lastIndexOf(prefix, 0) === 0;
+    }
+    ts.startsWith = startsWith;
+    function removePrefix(str, prefix) {
+        return startsWith(str, prefix) ? str.substr(prefix.length) : str;
+    }
+    ts.removePrefix = removePrefix;
+    function tryRemovePrefix(str, prefix) {
+        return startsWith(str, prefix) ? str.substring(prefix.length) : undefined;
+    }
+    ts.tryRemovePrefix = tryRemovePrefix;
     function isPatternMatch(_a, candidate) {
         var prefix = _a.prefix, suffix = _a.suffix;
         return candidate.length >= prefix.length + suffix.length &&
             startsWith(candidate, prefix) &&
             endsWith(candidate, suffix);
     }
-    function tryParsePattern(pattern) {
-        Debug.assert(hasZeroOrOneAsteriskCharacter(pattern));
-        var indexOfStar = pattern.indexOf("*");
-        return indexOfStar === -1 ? undefined : {
-            prefix: pattern.substr(0, indexOfStar),
-            suffix: pattern.substr(indexOfStar + 1)
-        };
-    }
-    ts.tryParsePattern = tryParsePattern;
-    function positionIsSynthesized(pos) {
-        return !(pos >= 0);
-    }
-    ts.positionIsSynthesized = positionIsSynthesized;
-    function extensionIsTypeScript(ext) {
-        return ext === ".ts" || ext === ".tsx" || ext === ".d.ts";
-    }
-    ts.extensionIsTypeScript = extensionIsTypeScript;
-    function resolutionExtensionIsTypeScriptOrJson(ext) {
-        return extensionIsTypeScript(ext) || ext === ".json";
-    }
-    ts.resolutionExtensionIsTypeScriptOrJson = resolutionExtensionIsTypeScriptOrJson;
-    function extensionFromPath(path) {
-        var ext = tryGetExtensionFromPath(path);
-        return ext !== undefined ? ext : Debug.fail("File " + path + " has unknown extension.");
-    }
-    ts.extensionFromPath = extensionFromPath;
-    function isAnySupportedFileExtension(path) {
-        return tryGetExtensionFromPath(path) !== undefined;
-    }
-    ts.isAnySupportedFileExtension = isAnySupportedFileExtension;
-    function tryGetExtensionFromPath(path) {
-        return find(ts.supportedTypescriptExtensionsForExtractExtension, function (e) { return fileExtensionIs(path, e); }) || find(ts.supportedJavascriptExtensions, function (e) { return fileExtensionIs(path, e); });
-    }
-    ts.tryGetExtensionFromPath = tryGetExtensionFromPath;
-    function getAnyExtensionFromPathWorker(path, extensions, stringEqualityComparer) {
-        if (typeof extensions === "string")
-            extensions = [extensions];
-        for (var _i = 0, extensions_2 = extensions; _i < extensions_2.length; _i++) {
-            var extension = extensions_2[_i];
-            if (!startsWith(extension, "."))
-                extension = "." + extension;
-            if (path.length >= extension.length && path.charAt(path.length - extension.length) === ".") {
-                var pathExtension = path.slice(path.length - extension.length);
-                if (stringEqualityComparer(pathExtension, extension)) {
-                    return pathExtension;
-                }
-            }
-        }
-        return "";
-    }
-    function getAnyExtensionFromPath(path, extensions, ignoreCase) {
-        if (extensions) {
-            return getAnyExtensionFromPathWorker(path, extensions, ignoreCase ? equateStringsCaseInsensitive : equateStringsCaseSensitive);
-        }
-        var baseFileName = getBaseFileName(path);
-        var extensionIndex = baseFileName.lastIndexOf(".");
-        if (extensionIndex >= 0) {
-            return baseFileName.substring(extensionIndex);
-        }
-        return "";
-    }
-    ts.getAnyExtensionFromPath = getAnyExtensionFromPath;
-    function isCheckJsEnabledForFile(sourceFile, compilerOptions) {
-        return sourceFile.checkJsDirective ? sourceFile.checkJsDirective.enabled : compilerOptions.checkJs;
-    }
-    ts.isCheckJsEnabledForFile = isCheckJsEnabledForFile;
     function and(f, g) {
         return function (arg) { return f(arg) && g(arg); };
     }
@@ -4046,12 +1964,8 @@ var ts;
         return function (arg) { return f(arg) || g(arg); };
     }
     ts.or = or;
-    function assertTypeIsNever(_) { }
+    function assertTypeIsNever(_) { } // tslint:disable-line no-empty
     ts.assertTypeIsNever = assertTypeIsNever;
-    ts.emptyFileSystemEntries = {
-        files: ts.emptyArray,
-        directories: ts.emptyArray
-    };
     function singleElementArray(t) {
         return t === undefined ? undefined : [t];
     }
@@ -4066,11 +1980,11 @@ var ts;
             var newItem = newItems[newIndex];
             var oldItem = oldItems[oldIndex];
             var compareResult = comparer(newItem, oldItem);
-            if (compareResult === -1) {
+            if (compareResult === -1 /* LessThan */) {
                 inserted(newItem);
                 newIndex++;
             }
-            else if (compareResult === 1) {
+            else if (compareResult === 1 /* GreaterThan */) {
                 deleted(oldItem);
                 oldIndex++;
             }
@@ -4089,10 +2003,1526 @@ var ts;
     }
     ts.enumerateInsertsAndDeletes = enumerateInsertsAndDeletes;
 })(ts || (ts = {}));
+//# sourceMappingURL=core.js.map
+"use strict";
+var __assign = (this && this.__assign) || Object.assign || function(t) {
+    for (var s, i = 1, n = arguments.length; i < n; i++) {
+        s = arguments[i];
+        for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
+            t[p] = s[p];
+    }
+    return t;
+};
 var ts;
 (function (ts) {
+    // token > SyntaxKind.Identifier => token is a keyword
+    // Also, If you add a new SyntaxKind be sure to keep the `Markers` section at the bottom in sync
+    var SyntaxKind;
+    (function (SyntaxKind) {
+        SyntaxKind[SyntaxKind["Unknown"] = 0] = "Unknown";
+        SyntaxKind[SyntaxKind["EndOfFileToken"] = 1] = "EndOfFileToken";
+        SyntaxKind[SyntaxKind["SingleLineCommentTrivia"] = 2] = "SingleLineCommentTrivia";
+        SyntaxKind[SyntaxKind["MultiLineCommentTrivia"] = 3] = "MultiLineCommentTrivia";
+        SyntaxKind[SyntaxKind["NewLineTrivia"] = 4] = "NewLineTrivia";
+        SyntaxKind[SyntaxKind["WhitespaceTrivia"] = 5] = "WhitespaceTrivia";
+        // We detect and preserve #! on the first line
+        SyntaxKind[SyntaxKind["ShebangTrivia"] = 6] = "ShebangTrivia";
+        // We detect and provide better error recovery when we encounter a git merge marker.  This
+        // allows us to edit files with git-conflict markers in them in a much more pleasant manner.
+        SyntaxKind[SyntaxKind["ConflictMarkerTrivia"] = 7] = "ConflictMarkerTrivia";
+        // Literals
+        SyntaxKind[SyntaxKind["NumericLiteral"] = 8] = "NumericLiteral";
+        SyntaxKind[SyntaxKind["StringLiteral"] = 9] = "StringLiteral";
+        SyntaxKind[SyntaxKind["JsxText"] = 10] = "JsxText";
+        SyntaxKind[SyntaxKind["JsxTextAllWhiteSpaces"] = 11] = "JsxTextAllWhiteSpaces";
+        SyntaxKind[SyntaxKind["RegularExpressionLiteral"] = 12] = "RegularExpressionLiteral";
+        SyntaxKind[SyntaxKind["NoSubstitutionTemplateLiteral"] = 13] = "NoSubstitutionTemplateLiteral";
+        // Pseudo-literals
+        SyntaxKind[SyntaxKind["TemplateHead"] = 14] = "TemplateHead";
+        SyntaxKind[SyntaxKind["TemplateMiddle"] = 15] = "TemplateMiddle";
+        SyntaxKind[SyntaxKind["TemplateTail"] = 16] = "TemplateTail";
+        // Punctuation
+        SyntaxKind[SyntaxKind["OpenBraceToken"] = 17] = "OpenBraceToken";
+        SyntaxKind[SyntaxKind["CloseBraceToken"] = 18] = "CloseBraceToken";
+        SyntaxKind[SyntaxKind["OpenParenToken"] = 19] = "OpenParenToken";
+        SyntaxKind[SyntaxKind["CloseParenToken"] = 20] = "CloseParenToken";
+        SyntaxKind[SyntaxKind["OpenBracketToken"] = 21] = "OpenBracketToken";
+        SyntaxKind[SyntaxKind["CloseBracketToken"] = 22] = "CloseBracketToken";
+        SyntaxKind[SyntaxKind["DotToken"] = 23] = "DotToken";
+        SyntaxKind[SyntaxKind["DotDotDotToken"] = 24] = "DotDotDotToken";
+        SyntaxKind[SyntaxKind["SemicolonToken"] = 25] = "SemicolonToken";
+        SyntaxKind[SyntaxKind["CommaToken"] = 26] = "CommaToken";
+        SyntaxKind[SyntaxKind["LessThanToken"] = 27] = "LessThanToken";
+        SyntaxKind[SyntaxKind["LessThanSlashToken"] = 28] = "LessThanSlashToken";
+        SyntaxKind[SyntaxKind["GreaterThanToken"] = 29] = "GreaterThanToken";
+        SyntaxKind[SyntaxKind["LessThanEqualsToken"] = 30] = "LessThanEqualsToken";
+        SyntaxKind[SyntaxKind["GreaterThanEqualsToken"] = 31] = "GreaterThanEqualsToken";
+        SyntaxKind[SyntaxKind["EqualsEqualsToken"] = 32] = "EqualsEqualsToken";
+        SyntaxKind[SyntaxKind["ExclamationEqualsToken"] = 33] = "ExclamationEqualsToken";
+        SyntaxKind[SyntaxKind["EqualsEqualsEqualsToken"] = 34] = "EqualsEqualsEqualsToken";
+        SyntaxKind[SyntaxKind["ExclamationEqualsEqualsToken"] = 35] = "ExclamationEqualsEqualsToken";
+        SyntaxKind[SyntaxKind["EqualsGreaterThanToken"] = 36] = "EqualsGreaterThanToken";
+        SyntaxKind[SyntaxKind["PlusToken"] = 37] = "PlusToken";
+        SyntaxKind[SyntaxKind["MinusToken"] = 38] = "MinusToken";
+        SyntaxKind[SyntaxKind["AsteriskToken"] = 39] = "AsteriskToken";
+        SyntaxKind[SyntaxKind["AsteriskAsteriskToken"] = 40] = "AsteriskAsteriskToken";
+        SyntaxKind[SyntaxKind["SlashToken"] = 41] = "SlashToken";
+        SyntaxKind[SyntaxKind["PercentToken"] = 42] = "PercentToken";
+        SyntaxKind[SyntaxKind["PlusPlusToken"] = 43] = "PlusPlusToken";
+        SyntaxKind[SyntaxKind["MinusMinusToken"] = 44] = "MinusMinusToken";
+        SyntaxKind[SyntaxKind["LessThanLessThanToken"] = 45] = "LessThanLessThanToken";
+        SyntaxKind[SyntaxKind["GreaterThanGreaterThanToken"] = 46] = "GreaterThanGreaterThanToken";
+        SyntaxKind[SyntaxKind["GreaterThanGreaterThanGreaterThanToken"] = 47] = "GreaterThanGreaterThanGreaterThanToken";
+        SyntaxKind[SyntaxKind["AmpersandToken"] = 48] = "AmpersandToken";
+        SyntaxKind[SyntaxKind["BarToken"] = 49] = "BarToken";
+        SyntaxKind[SyntaxKind["CaretToken"] = 50] = "CaretToken";
+        SyntaxKind[SyntaxKind["ExclamationToken"] = 51] = "ExclamationToken";
+        SyntaxKind[SyntaxKind["TildeToken"] = 52] = "TildeToken";
+        SyntaxKind[SyntaxKind["AmpersandAmpersandToken"] = 53] = "AmpersandAmpersandToken";
+        SyntaxKind[SyntaxKind["BarBarToken"] = 54] = "BarBarToken";
+        SyntaxKind[SyntaxKind["QuestionToken"] = 55] = "QuestionToken";
+        SyntaxKind[SyntaxKind["ColonToken"] = 56] = "ColonToken";
+        SyntaxKind[SyntaxKind["AtToken"] = 57] = "AtToken";
+        // Assignments
+        SyntaxKind[SyntaxKind["EqualsToken"] = 58] = "EqualsToken";
+        SyntaxKind[SyntaxKind["PlusEqualsToken"] = 59] = "PlusEqualsToken";
+        SyntaxKind[SyntaxKind["MinusEqualsToken"] = 60] = "MinusEqualsToken";
+        SyntaxKind[SyntaxKind["AsteriskEqualsToken"] = 61] = "AsteriskEqualsToken";
+        SyntaxKind[SyntaxKind["AsteriskAsteriskEqualsToken"] = 62] = "AsteriskAsteriskEqualsToken";
+        SyntaxKind[SyntaxKind["SlashEqualsToken"] = 63] = "SlashEqualsToken";
+        SyntaxKind[SyntaxKind["PercentEqualsToken"] = 64] = "PercentEqualsToken";
+        SyntaxKind[SyntaxKind["LessThanLessThanEqualsToken"] = 65] = "LessThanLessThanEqualsToken";
+        SyntaxKind[SyntaxKind["GreaterThanGreaterThanEqualsToken"] = 66] = "GreaterThanGreaterThanEqualsToken";
+        SyntaxKind[SyntaxKind["GreaterThanGreaterThanGreaterThanEqualsToken"] = 67] = "GreaterThanGreaterThanGreaterThanEqualsToken";
+        SyntaxKind[SyntaxKind["AmpersandEqualsToken"] = 68] = "AmpersandEqualsToken";
+        SyntaxKind[SyntaxKind["BarEqualsToken"] = 69] = "BarEqualsToken";
+        SyntaxKind[SyntaxKind["CaretEqualsToken"] = 70] = "CaretEqualsToken";
+        // Identifiers
+        SyntaxKind[SyntaxKind["Identifier"] = 71] = "Identifier";
+        // Reserved words
+        SyntaxKind[SyntaxKind["BreakKeyword"] = 72] = "BreakKeyword";
+        SyntaxKind[SyntaxKind["CaseKeyword"] = 73] = "CaseKeyword";
+        SyntaxKind[SyntaxKind["CatchKeyword"] = 74] = "CatchKeyword";
+        SyntaxKind[SyntaxKind["ClassKeyword"] = 75] = "ClassKeyword";
+        SyntaxKind[SyntaxKind["ConstKeyword"] = 76] = "ConstKeyword";
+        SyntaxKind[SyntaxKind["ContinueKeyword"] = 77] = "ContinueKeyword";
+        SyntaxKind[SyntaxKind["DebuggerKeyword"] = 78] = "DebuggerKeyword";
+        SyntaxKind[SyntaxKind["DefaultKeyword"] = 79] = "DefaultKeyword";
+        SyntaxKind[SyntaxKind["DeleteKeyword"] = 80] = "DeleteKeyword";
+        SyntaxKind[SyntaxKind["DoKeyword"] = 81] = "DoKeyword";
+        SyntaxKind[SyntaxKind["ElseKeyword"] = 82] = "ElseKeyword";
+        SyntaxKind[SyntaxKind["EnumKeyword"] = 83] = "EnumKeyword";
+        SyntaxKind[SyntaxKind["ExportKeyword"] = 84] = "ExportKeyword";
+        SyntaxKind[SyntaxKind["ExtendsKeyword"] = 85] = "ExtendsKeyword";
+        SyntaxKind[SyntaxKind["FalseKeyword"] = 86] = "FalseKeyword";
+        SyntaxKind[SyntaxKind["FinallyKeyword"] = 87] = "FinallyKeyword";
+        SyntaxKind[SyntaxKind["ForKeyword"] = 88] = "ForKeyword";
+        SyntaxKind[SyntaxKind["FunctionKeyword"] = 89] = "FunctionKeyword";
+        SyntaxKind[SyntaxKind["IfKeyword"] = 90] = "IfKeyword";
+        SyntaxKind[SyntaxKind["ImportKeyword"] = 91] = "ImportKeyword";
+        SyntaxKind[SyntaxKind["InKeyword"] = 92] = "InKeyword";
+        SyntaxKind[SyntaxKind["InstanceOfKeyword"] = 93] = "InstanceOfKeyword";
+        SyntaxKind[SyntaxKind["NewKeyword"] = 94] = "NewKeyword";
+        SyntaxKind[SyntaxKind["NullKeyword"] = 95] = "NullKeyword";
+        SyntaxKind[SyntaxKind["ReturnKeyword"] = 96] = "ReturnKeyword";
+        SyntaxKind[SyntaxKind["SuperKeyword"] = 97] = "SuperKeyword";
+        SyntaxKind[SyntaxKind["SwitchKeyword"] = 98] = "SwitchKeyword";
+        SyntaxKind[SyntaxKind["ThisKeyword"] = 99] = "ThisKeyword";
+        SyntaxKind[SyntaxKind["ThrowKeyword"] = 100] = "ThrowKeyword";
+        SyntaxKind[SyntaxKind["TrueKeyword"] = 101] = "TrueKeyword";
+        SyntaxKind[SyntaxKind["TryKeyword"] = 102] = "TryKeyword";
+        SyntaxKind[SyntaxKind["TypeOfKeyword"] = 103] = "TypeOfKeyword";
+        SyntaxKind[SyntaxKind["VarKeyword"] = 104] = "VarKeyword";
+        SyntaxKind[SyntaxKind["VoidKeyword"] = 105] = "VoidKeyword";
+        SyntaxKind[SyntaxKind["WhileKeyword"] = 106] = "WhileKeyword";
+        SyntaxKind[SyntaxKind["WithKeyword"] = 107] = "WithKeyword";
+        // Strict mode reserved words
+        SyntaxKind[SyntaxKind["ImplementsKeyword"] = 108] = "ImplementsKeyword";
+        SyntaxKind[SyntaxKind["InterfaceKeyword"] = 109] = "InterfaceKeyword";
+        SyntaxKind[SyntaxKind["LetKeyword"] = 110] = "LetKeyword";
+        SyntaxKind[SyntaxKind["PackageKeyword"] = 111] = "PackageKeyword";
+        SyntaxKind[SyntaxKind["PrivateKeyword"] = 112] = "PrivateKeyword";
+        SyntaxKind[SyntaxKind["ProtectedKeyword"] = 113] = "ProtectedKeyword";
+        SyntaxKind[SyntaxKind["PublicKeyword"] = 114] = "PublicKeyword";
+        SyntaxKind[SyntaxKind["StaticKeyword"] = 115] = "StaticKeyword";
+        SyntaxKind[SyntaxKind["YieldKeyword"] = 116] = "YieldKeyword";
+        // Contextual keywords
+        SyntaxKind[SyntaxKind["AbstractKeyword"] = 117] = "AbstractKeyword";
+        SyntaxKind[SyntaxKind["AsKeyword"] = 118] = "AsKeyword";
+        SyntaxKind[SyntaxKind["AnyKeyword"] = 119] = "AnyKeyword";
+        SyntaxKind[SyntaxKind["AsyncKeyword"] = 120] = "AsyncKeyword";
+        SyntaxKind[SyntaxKind["AwaitKeyword"] = 121] = "AwaitKeyword";
+        SyntaxKind[SyntaxKind["BooleanKeyword"] = 122] = "BooleanKeyword";
+        SyntaxKind[SyntaxKind["ConstructorKeyword"] = 123] = "ConstructorKeyword";
+        SyntaxKind[SyntaxKind["DeclareKeyword"] = 124] = "DeclareKeyword";
+        SyntaxKind[SyntaxKind["GetKeyword"] = 125] = "GetKeyword";
+        SyntaxKind[SyntaxKind["InferKeyword"] = 126] = "InferKeyword";
+        SyntaxKind[SyntaxKind["IsKeyword"] = 127] = "IsKeyword";
+        SyntaxKind[SyntaxKind["KeyOfKeyword"] = 128] = "KeyOfKeyword";
+        SyntaxKind[SyntaxKind["ModuleKeyword"] = 129] = "ModuleKeyword";
+        SyntaxKind[SyntaxKind["NamespaceKeyword"] = 130] = "NamespaceKeyword";
+        SyntaxKind[SyntaxKind["NeverKeyword"] = 131] = "NeverKeyword";
+        SyntaxKind[SyntaxKind["ReadonlyKeyword"] = 132] = "ReadonlyKeyword";
+        SyntaxKind[SyntaxKind["RequireKeyword"] = 133] = "RequireKeyword";
+        SyntaxKind[SyntaxKind["NumberKeyword"] = 134] = "NumberKeyword";
+        SyntaxKind[SyntaxKind["ObjectKeyword"] = 135] = "ObjectKeyword";
+        SyntaxKind[SyntaxKind["SetKeyword"] = 136] = "SetKeyword";
+        SyntaxKind[SyntaxKind["StringKeyword"] = 137] = "StringKeyword";
+        SyntaxKind[SyntaxKind["SymbolKeyword"] = 138] = "SymbolKeyword";
+        SyntaxKind[SyntaxKind["TypeKeyword"] = 139] = "TypeKeyword";
+        SyntaxKind[SyntaxKind["UndefinedKeyword"] = 140] = "UndefinedKeyword";
+        SyntaxKind[SyntaxKind["UniqueKeyword"] = 141] = "UniqueKeyword";
+        SyntaxKind[SyntaxKind["UnknownKeyword"] = 142] = "UnknownKeyword";
+        SyntaxKind[SyntaxKind["FromKeyword"] = 143] = "FromKeyword";
+        SyntaxKind[SyntaxKind["GlobalKeyword"] = 144] = "GlobalKeyword";
+        SyntaxKind[SyntaxKind["OfKeyword"] = 145] = "OfKeyword";
+        // Parse tree nodes
+        // Names
+        SyntaxKind[SyntaxKind["QualifiedName"] = 146] = "QualifiedName";
+        SyntaxKind[SyntaxKind["ComputedPropertyName"] = 147] = "ComputedPropertyName";
+        // Signature elements
+        SyntaxKind[SyntaxKind["TypeParameter"] = 148] = "TypeParameter";
+        SyntaxKind[SyntaxKind["Parameter"] = 149] = "Parameter";
+        SyntaxKind[SyntaxKind["Decorator"] = 150] = "Decorator";
+        // TypeMember
+        SyntaxKind[SyntaxKind["PropertySignature"] = 151] = "PropertySignature";
+        SyntaxKind[SyntaxKind["PropertyDeclaration"] = 152] = "PropertyDeclaration";
+        SyntaxKind[SyntaxKind["MethodSignature"] = 153] = "MethodSignature";
+        SyntaxKind[SyntaxKind["MethodDeclaration"] = 154] = "MethodDeclaration";
+        SyntaxKind[SyntaxKind["Constructor"] = 155] = "Constructor";
+        SyntaxKind[SyntaxKind["GetAccessor"] = 156] = "GetAccessor";
+        SyntaxKind[SyntaxKind["SetAccessor"] = 157] = "SetAccessor";
+        SyntaxKind[SyntaxKind["CallSignature"] = 158] = "CallSignature";
+        SyntaxKind[SyntaxKind["ConstructSignature"] = 159] = "ConstructSignature";
+        SyntaxKind[SyntaxKind["IndexSignature"] = 160] = "IndexSignature";
+        // Type
+        SyntaxKind[SyntaxKind["TypePredicate"] = 161] = "TypePredicate";
+        SyntaxKind[SyntaxKind["TypeReference"] = 162] = "TypeReference";
+        SyntaxKind[SyntaxKind["FunctionType"] = 163] = "FunctionType";
+        SyntaxKind[SyntaxKind["ConstructorType"] = 164] = "ConstructorType";
+        SyntaxKind[SyntaxKind["TypeQuery"] = 165] = "TypeQuery";
+        SyntaxKind[SyntaxKind["TypeLiteral"] = 166] = "TypeLiteral";
+        SyntaxKind[SyntaxKind["ArrayType"] = 167] = "ArrayType";
+        SyntaxKind[SyntaxKind["TupleType"] = 168] = "TupleType";
+        SyntaxKind[SyntaxKind["UnionType"] = 169] = "UnionType";
+        SyntaxKind[SyntaxKind["IntersectionType"] = 170] = "IntersectionType";
+        SyntaxKind[SyntaxKind["ConditionalType"] = 171] = "ConditionalType";
+        SyntaxKind[SyntaxKind["InferType"] = 172] = "InferType";
+        SyntaxKind[SyntaxKind["ParenthesizedType"] = 173] = "ParenthesizedType";
+        SyntaxKind[SyntaxKind["ThisType"] = 174] = "ThisType";
+        SyntaxKind[SyntaxKind["TypeOperator"] = 175] = "TypeOperator";
+        SyntaxKind[SyntaxKind["IndexedAccessType"] = 176] = "IndexedAccessType";
+        SyntaxKind[SyntaxKind["MappedType"] = 177] = "MappedType";
+        SyntaxKind[SyntaxKind["LiteralType"] = 178] = "LiteralType";
+        SyntaxKind[SyntaxKind["ImportType"] = 179] = "ImportType";
+        // Binding patterns
+        SyntaxKind[SyntaxKind["ObjectBindingPattern"] = 180] = "ObjectBindingPattern";
+        SyntaxKind[SyntaxKind["ArrayBindingPattern"] = 181] = "ArrayBindingPattern";
+        SyntaxKind[SyntaxKind["BindingElement"] = 182] = "BindingElement";
+        // Expression
+        SyntaxKind[SyntaxKind["ArrayLiteralExpression"] = 183] = "ArrayLiteralExpression";
+        SyntaxKind[SyntaxKind["ObjectLiteralExpression"] = 184] = "ObjectLiteralExpression";
+        SyntaxKind[SyntaxKind["PropertyAccessExpression"] = 185] = "PropertyAccessExpression";
+        SyntaxKind[SyntaxKind["ElementAccessExpression"] = 186] = "ElementAccessExpression";
+        SyntaxKind[SyntaxKind["CallExpression"] = 187] = "CallExpression";
+        SyntaxKind[SyntaxKind["NewExpression"] = 188] = "NewExpression";
+        SyntaxKind[SyntaxKind["TaggedTemplateExpression"] = 189] = "TaggedTemplateExpression";
+        SyntaxKind[SyntaxKind["TypeAssertionExpression"] = 190] = "TypeAssertionExpression";
+        SyntaxKind[SyntaxKind["ParenthesizedExpression"] = 191] = "ParenthesizedExpression";
+        SyntaxKind[SyntaxKind["FunctionExpression"] = 192] = "FunctionExpression";
+        SyntaxKind[SyntaxKind["ArrowFunction"] = 193] = "ArrowFunction";
+        SyntaxKind[SyntaxKind["DeleteExpression"] = 194] = "DeleteExpression";
+        SyntaxKind[SyntaxKind["TypeOfExpression"] = 195] = "TypeOfExpression";
+        SyntaxKind[SyntaxKind["VoidExpression"] = 196] = "VoidExpression";
+        SyntaxKind[SyntaxKind["AwaitExpression"] = 197] = "AwaitExpression";
+        SyntaxKind[SyntaxKind["PrefixUnaryExpression"] = 198] = "PrefixUnaryExpression";
+        SyntaxKind[SyntaxKind["PostfixUnaryExpression"] = 199] = "PostfixUnaryExpression";
+        SyntaxKind[SyntaxKind["BinaryExpression"] = 200] = "BinaryExpression";
+        SyntaxKind[SyntaxKind["ConditionalExpression"] = 201] = "ConditionalExpression";
+        SyntaxKind[SyntaxKind["TemplateExpression"] = 202] = "TemplateExpression";
+        SyntaxKind[SyntaxKind["YieldExpression"] = 203] = "YieldExpression";
+        SyntaxKind[SyntaxKind["SpreadElement"] = 204] = "SpreadElement";
+        SyntaxKind[SyntaxKind["ClassExpression"] = 205] = "ClassExpression";
+        SyntaxKind[SyntaxKind["OmittedExpression"] = 206] = "OmittedExpression";
+        SyntaxKind[SyntaxKind["ExpressionWithTypeArguments"] = 207] = "ExpressionWithTypeArguments";
+        SyntaxKind[SyntaxKind["AsExpression"] = 208] = "AsExpression";
+        SyntaxKind[SyntaxKind["NonNullExpression"] = 209] = "NonNullExpression";
+        SyntaxKind[SyntaxKind["MetaProperty"] = 210] = "MetaProperty";
+        // Misc
+        SyntaxKind[SyntaxKind["TemplateSpan"] = 211] = "TemplateSpan";
+        SyntaxKind[SyntaxKind["SemicolonClassElement"] = 212] = "SemicolonClassElement";
+        // Element
+        SyntaxKind[SyntaxKind["Block"] = 213] = "Block";
+        SyntaxKind[SyntaxKind["VariableStatement"] = 214] = "VariableStatement";
+        SyntaxKind[SyntaxKind["EmptyStatement"] = 215] = "EmptyStatement";
+        SyntaxKind[SyntaxKind["ExpressionStatement"] = 216] = "ExpressionStatement";
+        SyntaxKind[SyntaxKind["IfStatement"] = 217] = "IfStatement";
+        SyntaxKind[SyntaxKind["DoStatement"] = 218] = "DoStatement";
+        SyntaxKind[SyntaxKind["WhileStatement"] = 219] = "WhileStatement";
+        SyntaxKind[SyntaxKind["ForStatement"] = 220] = "ForStatement";
+        SyntaxKind[SyntaxKind["ForInStatement"] = 221] = "ForInStatement";
+        SyntaxKind[SyntaxKind["ForOfStatement"] = 222] = "ForOfStatement";
+        SyntaxKind[SyntaxKind["ContinueStatement"] = 223] = "ContinueStatement";
+        SyntaxKind[SyntaxKind["BreakStatement"] = 224] = "BreakStatement";
+        SyntaxKind[SyntaxKind["ReturnStatement"] = 225] = "ReturnStatement";
+        SyntaxKind[SyntaxKind["WithStatement"] = 226] = "WithStatement";
+        SyntaxKind[SyntaxKind["SwitchStatement"] = 227] = "SwitchStatement";
+        SyntaxKind[SyntaxKind["LabeledStatement"] = 228] = "LabeledStatement";
+        SyntaxKind[SyntaxKind["ThrowStatement"] = 229] = "ThrowStatement";
+        SyntaxKind[SyntaxKind["TryStatement"] = 230] = "TryStatement";
+        SyntaxKind[SyntaxKind["DebuggerStatement"] = 231] = "DebuggerStatement";
+        SyntaxKind[SyntaxKind["VariableDeclaration"] = 232] = "VariableDeclaration";
+        SyntaxKind[SyntaxKind["VariableDeclarationList"] = 233] = "VariableDeclarationList";
+        SyntaxKind[SyntaxKind["FunctionDeclaration"] = 234] = "FunctionDeclaration";
+        SyntaxKind[SyntaxKind["ClassDeclaration"] = 235] = "ClassDeclaration";
+        SyntaxKind[SyntaxKind["InterfaceDeclaration"] = 236] = "InterfaceDeclaration";
+        SyntaxKind[SyntaxKind["TypeAliasDeclaration"] = 237] = "TypeAliasDeclaration";
+        SyntaxKind[SyntaxKind["EnumDeclaration"] = 238] = "EnumDeclaration";
+        SyntaxKind[SyntaxKind["ModuleDeclaration"] = 239] = "ModuleDeclaration";
+        SyntaxKind[SyntaxKind["ModuleBlock"] = 240] = "ModuleBlock";
+        SyntaxKind[SyntaxKind["CaseBlock"] = 241] = "CaseBlock";
+        SyntaxKind[SyntaxKind["NamespaceExportDeclaration"] = 242] = "NamespaceExportDeclaration";
+        SyntaxKind[SyntaxKind["ImportEqualsDeclaration"] = 243] = "ImportEqualsDeclaration";
+        SyntaxKind[SyntaxKind["ImportDeclaration"] = 244] = "ImportDeclaration";
+        SyntaxKind[SyntaxKind["ImportClause"] = 245] = "ImportClause";
+        SyntaxKind[SyntaxKind["NamespaceImport"] = 246] = "NamespaceImport";
+        SyntaxKind[SyntaxKind["NamedImports"] = 247] = "NamedImports";
+        SyntaxKind[SyntaxKind["ImportSpecifier"] = 248] = "ImportSpecifier";
+        SyntaxKind[SyntaxKind["ExportAssignment"] = 249] = "ExportAssignment";
+        SyntaxKind[SyntaxKind["ExportDeclaration"] = 250] = "ExportDeclaration";
+        SyntaxKind[SyntaxKind["NamedExports"] = 251] = "NamedExports";
+        SyntaxKind[SyntaxKind["ExportSpecifier"] = 252] = "ExportSpecifier";
+        SyntaxKind[SyntaxKind["MissingDeclaration"] = 253] = "MissingDeclaration";
+        // Module references
+        SyntaxKind[SyntaxKind["ExternalModuleReference"] = 254] = "ExternalModuleReference";
+        // JSX
+        SyntaxKind[SyntaxKind["JsxElement"] = 255] = "JsxElement";
+        SyntaxKind[SyntaxKind["JsxSelfClosingElement"] = 256] = "JsxSelfClosingElement";
+        SyntaxKind[SyntaxKind["JsxOpeningElement"] = 257] = "JsxOpeningElement";
+        SyntaxKind[SyntaxKind["JsxClosingElement"] = 258] = "JsxClosingElement";
+        SyntaxKind[SyntaxKind["JsxFragment"] = 259] = "JsxFragment";
+        SyntaxKind[SyntaxKind["JsxOpeningFragment"] = 260] = "JsxOpeningFragment";
+        SyntaxKind[SyntaxKind["JsxClosingFragment"] = 261] = "JsxClosingFragment";
+        SyntaxKind[SyntaxKind["JsxAttribute"] = 262] = "JsxAttribute";
+        SyntaxKind[SyntaxKind["JsxAttributes"] = 263] = "JsxAttributes";
+        SyntaxKind[SyntaxKind["JsxSpreadAttribute"] = 264] = "JsxSpreadAttribute";
+        SyntaxKind[SyntaxKind["JsxExpression"] = 265] = "JsxExpression";
+        // Clauses
+        SyntaxKind[SyntaxKind["CaseClause"] = 266] = "CaseClause";
+        SyntaxKind[SyntaxKind["DefaultClause"] = 267] = "DefaultClause";
+        SyntaxKind[SyntaxKind["HeritageClause"] = 268] = "HeritageClause";
+        SyntaxKind[SyntaxKind["CatchClause"] = 269] = "CatchClause";
+        // Property assignments
+        SyntaxKind[SyntaxKind["PropertyAssignment"] = 270] = "PropertyAssignment";
+        SyntaxKind[SyntaxKind["ShorthandPropertyAssignment"] = 271] = "ShorthandPropertyAssignment";
+        SyntaxKind[SyntaxKind["SpreadAssignment"] = 272] = "SpreadAssignment";
+        // Enum
+        SyntaxKind[SyntaxKind["EnumMember"] = 273] = "EnumMember";
+        // Top-level nodes
+        SyntaxKind[SyntaxKind["SourceFile"] = 274] = "SourceFile";
+        SyntaxKind[SyntaxKind["Bundle"] = 275] = "Bundle";
+        SyntaxKind[SyntaxKind["UnparsedSource"] = 276] = "UnparsedSource";
+        SyntaxKind[SyntaxKind["InputFiles"] = 277] = "InputFiles";
+        // JSDoc nodes
+        SyntaxKind[SyntaxKind["JSDocTypeExpression"] = 278] = "JSDocTypeExpression";
+        // The * type
+        SyntaxKind[SyntaxKind["JSDocAllType"] = 279] = "JSDocAllType";
+        // The ? type
+        SyntaxKind[SyntaxKind["JSDocUnknownType"] = 280] = "JSDocUnknownType";
+        SyntaxKind[SyntaxKind["JSDocNullableType"] = 281] = "JSDocNullableType";
+        SyntaxKind[SyntaxKind["JSDocNonNullableType"] = 282] = "JSDocNonNullableType";
+        SyntaxKind[SyntaxKind["JSDocOptionalType"] = 283] = "JSDocOptionalType";
+        SyntaxKind[SyntaxKind["JSDocFunctionType"] = 284] = "JSDocFunctionType";
+        SyntaxKind[SyntaxKind["JSDocVariadicType"] = 285] = "JSDocVariadicType";
+        SyntaxKind[SyntaxKind["JSDocComment"] = 286] = "JSDocComment";
+        SyntaxKind[SyntaxKind["JSDocTypeLiteral"] = 287] = "JSDocTypeLiteral";
+        SyntaxKind[SyntaxKind["JSDocSignature"] = 288] = "JSDocSignature";
+        SyntaxKind[SyntaxKind["JSDocTag"] = 289] = "JSDocTag";
+        SyntaxKind[SyntaxKind["JSDocAugmentsTag"] = 290] = "JSDocAugmentsTag";
+        SyntaxKind[SyntaxKind["JSDocClassTag"] = 291] = "JSDocClassTag";
+        SyntaxKind[SyntaxKind["JSDocCallbackTag"] = 292] = "JSDocCallbackTag";
+        SyntaxKind[SyntaxKind["JSDocParameterTag"] = 293] = "JSDocParameterTag";
+        SyntaxKind[SyntaxKind["JSDocReturnTag"] = 294] = "JSDocReturnTag";
+        SyntaxKind[SyntaxKind["JSDocTypeTag"] = 295] = "JSDocTypeTag";
+        SyntaxKind[SyntaxKind["JSDocTemplateTag"] = 296] = "JSDocTemplateTag";
+        SyntaxKind[SyntaxKind["JSDocTypedefTag"] = 297] = "JSDocTypedefTag";
+        SyntaxKind[SyntaxKind["JSDocPropertyTag"] = 298] = "JSDocPropertyTag";
+        // Synthesized list
+        SyntaxKind[SyntaxKind["SyntaxList"] = 299] = "SyntaxList";
+        // Transformation nodes
+        SyntaxKind[SyntaxKind["NotEmittedStatement"] = 300] = "NotEmittedStatement";
+        SyntaxKind[SyntaxKind["PartiallyEmittedExpression"] = 301] = "PartiallyEmittedExpression";
+        SyntaxKind[SyntaxKind["CommaListExpression"] = 302] = "CommaListExpression";
+        SyntaxKind[SyntaxKind["MergeDeclarationMarker"] = 303] = "MergeDeclarationMarker";
+        SyntaxKind[SyntaxKind["EndOfDeclarationMarker"] = 304] = "EndOfDeclarationMarker";
+        // Enum value count
+        SyntaxKind[SyntaxKind["Count"] = 305] = "Count";
+        // Markers
+        SyntaxKind[SyntaxKind["FirstAssignment"] = 58] = "FirstAssignment";
+        SyntaxKind[SyntaxKind["LastAssignment"] = 70] = "LastAssignment";
+        SyntaxKind[SyntaxKind["FirstCompoundAssignment"] = 59] = "FirstCompoundAssignment";
+        SyntaxKind[SyntaxKind["LastCompoundAssignment"] = 70] = "LastCompoundAssignment";
+        SyntaxKind[SyntaxKind["FirstReservedWord"] = 72] = "FirstReservedWord";
+        SyntaxKind[SyntaxKind["LastReservedWord"] = 107] = "LastReservedWord";
+        SyntaxKind[SyntaxKind["FirstKeyword"] = 72] = "FirstKeyword";
+        SyntaxKind[SyntaxKind["LastKeyword"] = 145] = "LastKeyword";
+        SyntaxKind[SyntaxKind["FirstFutureReservedWord"] = 108] = "FirstFutureReservedWord";
+        SyntaxKind[SyntaxKind["LastFutureReservedWord"] = 116] = "LastFutureReservedWord";
+        SyntaxKind[SyntaxKind["FirstTypeNode"] = 161] = "FirstTypeNode";
+        SyntaxKind[SyntaxKind["LastTypeNode"] = 179] = "LastTypeNode";
+        SyntaxKind[SyntaxKind["FirstPunctuation"] = 17] = "FirstPunctuation";
+        SyntaxKind[SyntaxKind["LastPunctuation"] = 70] = "LastPunctuation";
+        SyntaxKind[SyntaxKind["FirstToken"] = 0] = "FirstToken";
+        SyntaxKind[SyntaxKind["LastToken"] = 145] = "LastToken";
+        SyntaxKind[SyntaxKind["FirstTriviaToken"] = 2] = "FirstTriviaToken";
+        SyntaxKind[SyntaxKind["LastTriviaToken"] = 7] = "LastTriviaToken";
+        SyntaxKind[SyntaxKind["FirstLiteralToken"] = 8] = "FirstLiteralToken";
+        SyntaxKind[SyntaxKind["LastLiteralToken"] = 13] = "LastLiteralToken";
+        SyntaxKind[SyntaxKind["FirstTemplateToken"] = 13] = "FirstTemplateToken";
+        SyntaxKind[SyntaxKind["LastTemplateToken"] = 16] = "LastTemplateToken";
+        SyntaxKind[SyntaxKind["FirstBinaryOperator"] = 27] = "FirstBinaryOperator";
+        SyntaxKind[SyntaxKind["LastBinaryOperator"] = 70] = "LastBinaryOperator";
+        SyntaxKind[SyntaxKind["FirstNode"] = 146] = "FirstNode";
+        SyntaxKind[SyntaxKind["FirstJSDocNode"] = 278] = "FirstJSDocNode";
+        SyntaxKind[SyntaxKind["LastJSDocNode"] = 298] = "LastJSDocNode";
+        SyntaxKind[SyntaxKind["FirstJSDocTagNode"] = 289] = "FirstJSDocTagNode";
+        SyntaxKind[SyntaxKind["LastJSDocTagNode"] = 298] = "LastJSDocTagNode";
+        /* @internal */ SyntaxKind[SyntaxKind["FirstContextualKeyword"] = 117] = "FirstContextualKeyword";
+        /* @internal */ SyntaxKind[SyntaxKind["LastContextualKeyword"] = 145] = "LastContextualKeyword";
+    })(SyntaxKind = ts.SyntaxKind || (ts.SyntaxKind = {}));
+    var NodeFlags;
+    (function (NodeFlags) {
+        NodeFlags[NodeFlags["None"] = 0] = "None";
+        NodeFlags[NodeFlags["Let"] = 1] = "Let";
+        NodeFlags[NodeFlags["Const"] = 2] = "Const";
+        NodeFlags[NodeFlags["NestedNamespace"] = 4] = "NestedNamespace";
+        NodeFlags[NodeFlags["Synthesized"] = 8] = "Synthesized";
+        NodeFlags[NodeFlags["Namespace"] = 16] = "Namespace";
+        NodeFlags[NodeFlags["ExportContext"] = 32] = "ExportContext";
+        NodeFlags[NodeFlags["ContainsThis"] = 64] = "ContainsThis";
+        NodeFlags[NodeFlags["HasImplicitReturn"] = 128] = "HasImplicitReturn";
+        NodeFlags[NodeFlags["HasExplicitReturn"] = 256] = "HasExplicitReturn";
+        NodeFlags[NodeFlags["GlobalAugmentation"] = 512] = "GlobalAugmentation";
+        NodeFlags[NodeFlags["HasAsyncFunctions"] = 1024] = "HasAsyncFunctions";
+        NodeFlags[NodeFlags["DisallowInContext"] = 2048] = "DisallowInContext";
+        NodeFlags[NodeFlags["YieldContext"] = 4096] = "YieldContext";
+        NodeFlags[NodeFlags["DecoratorContext"] = 8192] = "DecoratorContext";
+        NodeFlags[NodeFlags["AwaitContext"] = 16384] = "AwaitContext";
+        NodeFlags[NodeFlags["ThisNodeHasError"] = 32768] = "ThisNodeHasError";
+        NodeFlags[NodeFlags["JavaScriptFile"] = 65536] = "JavaScriptFile";
+        NodeFlags[NodeFlags["ThisNodeOrAnySubNodesHasError"] = 131072] = "ThisNodeOrAnySubNodesHasError";
+        NodeFlags[NodeFlags["HasAggregatedChildData"] = 262144] = "HasAggregatedChildData";
+        // These flags will be set when the parser encounters a dynamic import expression or 'import.meta' to avoid
+        // walking the tree if the flags are not set. However, these flags are just a approximation
+        // (hence why it's named "PossiblyContainsDynamicImport") because once set, the flags never get cleared.
+        // During editing, if a dynamic import is removed, incremental parsing will *NOT* clear this flag.
+        // This means that the tree will always be traversed during module resolution, or when looking for external module indicators.
+        // However, the removal operation should not occur often and in the case of the
+        // removal, it is likely that users will add the import anyway.
+        // The advantage of this approach is its simplicity. For the case of batch compilation,
+        // we guarantee that users won't have to pay the price of walking the tree if a dynamic import isn't used.
+        /* @internal */ NodeFlags[NodeFlags["PossiblyContainsDynamicImport"] = 524288] = "PossiblyContainsDynamicImport";
+        /* @internal */ NodeFlags[NodeFlags["PossiblyContainsImportMeta"] = 1048576] = "PossiblyContainsImportMeta";
+        NodeFlags[NodeFlags["JSDoc"] = 2097152] = "JSDoc";
+        /* @internal */ NodeFlags[NodeFlags["Ambient"] = 4194304] = "Ambient";
+        /* @internal */ NodeFlags[NodeFlags["InWithStatement"] = 8388608] = "InWithStatement";
+        NodeFlags[NodeFlags["JsonFile"] = 16777216] = "JsonFile";
+        NodeFlags[NodeFlags["BlockScoped"] = 3] = "BlockScoped";
+        NodeFlags[NodeFlags["ReachabilityCheckFlags"] = 384] = "ReachabilityCheckFlags";
+        NodeFlags[NodeFlags["ReachabilityAndEmitFlags"] = 1408] = "ReachabilityAndEmitFlags";
+        // Parsing context flags
+        NodeFlags[NodeFlags["ContextFlags"] = 12679168] = "ContextFlags";
+        // Exclude these flags when parsing a Type
+        NodeFlags[NodeFlags["TypeExcludesFlags"] = 20480] = "TypeExcludesFlags";
+        // Represents all flags that are potentially set once and
+        // never cleared on SourceFiles which get re-used in between incremental parses.
+        // See the comment above on `PossiblyContainsDynamicImport` and `PossiblyContainsImportMeta`.
+        /* @internal */ NodeFlags[NodeFlags["PermanentlySetIncrementalFlags"] = 1572864] = "PermanentlySetIncrementalFlags";
+    })(NodeFlags = ts.NodeFlags || (ts.NodeFlags = {}));
+    var ModifierFlags;
+    (function (ModifierFlags) {
+        ModifierFlags[ModifierFlags["None"] = 0] = "None";
+        ModifierFlags[ModifierFlags["Export"] = 1] = "Export";
+        ModifierFlags[ModifierFlags["Ambient"] = 2] = "Ambient";
+        ModifierFlags[ModifierFlags["Public"] = 4] = "Public";
+        ModifierFlags[ModifierFlags["Private"] = 8] = "Private";
+        ModifierFlags[ModifierFlags["Protected"] = 16] = "Protected";
+        ModifierFlags[ModifierFlags["Static"] = 32] = "Static";
+        ModifierFlags[ModifierFlags["Readonly"] = 64] = "Readonly";
+        ModifierFlags[ModifierFlags["Abstract"] = 128] = "Abstract";
+        ModifierFlags[ModifierFlags["Async"] = 256] = "Async";
+        ModifierFlags[ModifierFlags["Default"] = 512] = "Default";
+        ModifierFlags[ModifierFlags["Const"] = 2048] = "Const";
+        ModifierFlags[ModifierFlags["HasComputedFlags"] = 536870912] = "HasComputedFlags";
+        ModifierFlags[ModifierFlags["AccessibilityModifier"] = 28] = "AccessibilityModifier";
+        // Accessibility modifiers and 'readonly' can be attached to a parameter in a constructor to make it a property.
+        ModifierFlags[ModifierFlags["ParameterPropertyModifier"] = 92] = "ParameterPropertyModifier";
+        ModifierFlags[ModifierFlags["NonPublicAccessibilityModifier"] = 24] = "NonPublicAccessibilityModifier";
+        ModifierFlags[ModifierFlags["TypeScriptModifier"] = 2270] = "TypeScriptModifier";
+        ModifierFlags[ModifierFlags["ExportDefault"] = 513] = "ExportDefault";
+        ModifierFlags[ModifierFlags["All"] = 3071] = "All";
+    })(ModifierFlags = ts.ModifierFlags || (ts.ModifierFlags = {}));
+    var JsxFlags;
+    (function (JsxFlags) {
+        JsxFlags[JsxFlags["None"] = 0] = "None";
+        /** An element from a named property of the JSX.IntrinsicElements interface */
+        JsxFlags[JsxFlags["IntrinsicNamedElement"] = 1] = "IntrinsicNamedElement";
+        /** An element inferred from the string index signature of the JSX.IntrinsicElements interface */
+        JsxFlags[JsxFlags["IntrinsicIndexedElement"] = 2] = "IntrinsicIndexedElement";
+        JsxFlags[JsxFlags["IntrinsicElement"] = 3] = "IntrinsicElement";
+    })(JsxFlags = ts.JsxFlags || (ts.JsxFlags = {}));
+    /* @internal */
+    var RelationComparisonResult;
+    (function (RelationComparisonResult) {
+        RelationComparisonResult[RelationComparisonResult["Succeeded"] = 1] = "Succeeded";
+        RelationComparisonResult[RelationComparisonResult["Failed"] = 2] = "Failed";
+        RelationComparisonResult[RelationComparisonResult["FailedAndReported"] = 3] = "FailedAndReported";
+    })(RelationComparisonResult = ts.RelationComparisonResult || (ts.RelationComparisonResult = {}));
+    /*@internal*/
+    var GeneratedIdentifierFlags;
+    (function (GeneratedIdentifierFlags) {
+        // Kinds
+        GeneratedIdentifierFlags[GeneratedIdentifierFlags["None"] = 0] = "None";
+        GeneratedIdentifierFlags[GeneratedIdentifierFlags["Auto"] = 1] = "Auto";
+        GeneratedIdentifierFlags[GeneratedIdentifierFlags["Loop"] = 2] = "Loop";
+        GeneratedIdentifierFlags[GeneratedIdentifierFlags["Unique"] = 3] = "Unique";
+        GeneratedIdentifierFlags[GeneratedIdentifierFlags["Node"] = 4] = "Node";
+        GeneratedIdentifierFlags[GeneratedIdentifierFlags["KindMask"] = 7] = "KindMask";
+        // Flags
+        GeneratedIdentifierFlags[GeneratedIdentifierFlags["ReservedInNestedScopes"] = 8] = "ReservedInNestedScopes";
+        GeneratedIdentifierFlags[GeneratedIdentifierFlags["Optimistic"] = 16] = "Optimistic";
+        GeneratedIdentifierFlags[GeneratedIdentifierFlags["FileLevel"] = 32] = "FileLevel";
+    })(GeneratedIdentifierFlags = ts.GeneratedIdentifierFlags || (ts.GeneratedIdentifierFlags = {}));
+    /* @internal */
+    var TokenFlags;
+    (function (TokenFlags) {
+        TokenFlags[TokenFlags["None"] = 0] = "None";
+        TokenFlags[TokenFlags["PrecedingLineBreak"] = 1] = "PrecedingLineBreak";
+        TokenFlags[TokenFlags["PrecedingJSDocComment"] = 2] = "PrecedingJSDocComment";
+        TokenFlags[TokenFlags["Unterminated"] = 4] = "Unterminated";
+        TokenFlags[TokenFlags["ExtendedUnicodeEscape"] = 8] = "ExtendedUnicodeEscape";
+        TokenFlags[TokenFlags["Scientific"] = 16] = "Scientific";
+        TokenFlags[TokenFlags["Octal"] = 32] = "Octal";
+        TokenFlags[TokenFlags["HexSpecifier"] = 64] = "HexSpecifier";
+        TokenFlags[TokenFlags["BinarySpecifier"] = 128] = "BinarySpecifier";
+        TokenFlags[TokenFlags["OctalSpecifier"] = 256] = "OctalSpecifier";
+        TokenFlags[TokenFlags["ContainsSeparator"] = 512] = "ContainsSeparator";
+        TokenFlags[TokenFlags["BinaryOrOctalSpecifier"] = 384] = "BinaryOrOctalSpecifier";
+        TokenFlags[TokenFlags["NumericLiteralFlags"] = 1008] = "NumericLiteralFlags";
+    })(TokenFlags = ts.TokenFlags || (ts.TokenFlags = {}));
+    var FlowFlags;
+    (function (FlowFlags) {
+        FlowFlags[FlowFlags["Unreachable"] = 1] = "Unreachable";
+        FlowFlags[FlowFlags["Start"] = 2] = "Start";
+        FlowFlags[FlowFlags["BranchLabel"] = 4] = "BranchLabel";
+        FlowFlags[FlowFlags["LoopLabel"] = 8] = "LoopLabel";
+        FlowFlags[FlowFlags["Assignment"] = 16] = "Assignment";
+        FlowFlags[FlowFlags["TrueCondition"] = 32] = "TrueCondition";
+        FlowFlags[FlowFlags["FalseCondition"] = 64] = "FalseCondition";
+        FlowFlags[FlowFlags["SwitchClause"] = 128] = "SwitchClause";
+        FlowFlags[FlowFlags["ArrayMutation"] = 256] = "ArrayMutation";
+        FlowFlags[FlowFlags["Referenced"] = 512] = "Referenced";
+        FlowFlags[FlowFlags["Shared"] = 1024] = "Shared";
+        FlowFlags[FlowFlags["PreFinally"] = 2048] = "PreFinally";
+        FlowFlags[FlowFlags["AfterFinally"] = 4096] = "AfterFinally";
+        FlowFlags[FlowFlags["Label"] = 12] = "Label";
+        FlowFlags[FlowFlags["Condition"] = 96] = "Condition";
+    })(FlowFlags = ts.FlowFlags || (ts.FlowFlags = {}));
+    var OperationCanceledException = /** @class */ (function () {
+        function OperationCanceledException() {
+        }
+        return OperationCanceledException;
+    }());
+    ts.OperationCanceledException = OperationCanceledException;
+    /* @internal */
+    var StructureIsReused;
+    (function (StructureIsReused) {
+        StructureIsReused[StructureIsReused["Not"] = 0] = "Not";
+        StructureIsReused[StructureIsReused["SafeModules"] = 1] = "SafeModules";
+        StructureIsReused[StructureIsReused["Completely"] = 2] = "Completely";
+    })(StructureIsReused = ts.StructureIsReused || (ts.StructureIsReused = {}));
+    /** Return code used by getEmitOutput function to indicate status of the function */
+    var ExitStatus;
+    (function (ExitStatus) {
+        // Compiler ran successfully.  Either this was a simple do-nothing compilation (for example,
+        // when -version or -help was provided, or this was a normal compilation, no diagnostics
+        // were produced, and all outputs were generated successfully.
+        ExitStatus[ExitStatus["Success"] = 0] = "Success";
+        // Diagnostics were produced and because of them no code was generated.
+        ExitStatus[ExitStatus["DiagnosticsPresent_OutputsSkipped"] = 1] = "DiagnosticsPresent_OutputsSkipped";
+        // Diagnostics were produced and outputs were generated in spite of them.
+        ExitStatus[ExitStatus["DiagnosticsPresent_OutputsGenerated"] = 2] = "DiagnosticsPresent_OutputsGenerated";
+    })(ExitStatus = ts.ExitStatus || (ts.ExitStatus = {}));
+    /* @internal */
+    var UnionReduction;
+    (function (UnionReduction) {
+        UnionReduction[UnionReduction["None"] = 0] = "None";
+        UnionReduction[UnionReduction["Literal"] = 1] = "Literal";
+        UnionReduction[UnionReduction["Subtype"] = 2] = "Subtype";
+    })(UnionReduction = ts.UnionReduction || (ts.UnionReduction = {}));
+    var NodeBuilderFlags;
+    (function (NodeBuilderFlags) {
+        NodeBuilderFlags[NodeBuilderFlags["None"] = 0] = "None";
+        // Options
+        NodeBuilderFlags[NodeBuilderFlags["NoTruncation"] = 1] = "NoTruncation";
+        NodeBuilderFlags[NodeBuilderFlags["WriteArrayAsGenericType"] = 2] = "WriteArrayAsGenericType";
+        NodeBuilderFlags[NodeBuilderFlags["GenerateNamesForShadowedTypeParams"] = 4] = "GenerateNamesForShadowedTypeParams";
+        NodeBuilderFlags[NodeBuilderFlags["UseStructuralFallback"] = 8] = "UseStructuralFallback";
+        NodeBuilderFlags[NodeBuilderFlags["ForbidIndexedAccessSymbolReferences"] = 16] = "ForbidIndexedAccessSymbolReferences";
+        NodeBuilderFlags[NodeBuilderFlags["WriteTypeArgumentsOfSignature"] = 32] = "WriteTypeArgumentsOfSignature";
+        NodeBuilderFlags[NodeBuilderFlags["UseFullyQualifiedType"] = 64] = "UseFullyQualifiedType";
+        NodeBuilderFlags[NodeBuilderFlags["UseOnlyExternalAliasing"] = 128] = "UseOnlyExternalAliasing";
+        NodeBuilderFlags[NodeBuilderFlags["SuppressAnyReturnType"] = 256] = "SuppressAnyReturnType";
+        NodeBuilderFlags[NodeBuilderFlags["WriteTypeParametersInQualifiedName"] = 512] = "WriteTypeParametersInQualifiedName";
+        NodeBuilderFlags[NodeBuilderFlags["MultilineObjectLiterals"] = 1024] = "MultilineObjectLiterals";
+        NodeBuilderFlags[NodeBuilderFlags["WriteClassExpressionAsTypeLiteral"] = 2048] = "WriteClassExpressionAsTypeLiteral";
+        NodeBuilderFlags[NodeBuilderFlags["UseTypeOfFunction"] = 4096] = "UseTypeOfFunction";
+        NodeBuilderFlags[NodeBuilderFlags["OmitParameterModifiers"] = 8192] = "OmitParameterModifiers";
+        NodeBuilderFlags[NodeBuilderFlags["UseAliasDefinedOutsideCurrentScope"] = 16384] = "UseAliasDefinedOutsideCurrentScope";
+        // Error handling
+        NodeBuilderFlags[NodeBuilderFlags["AllowThisInObjectLiteral"] = 32768] = "AllowThisInObjectLiteral";
+        NodeBuilderFlags[NodeBuilderFlags["AllowQualifedNameInPlaceOfIdentifier"] = 65536] = "AllowQualifedNameInPlaceOfIdentifier";
+        NodeBuilderFlags[NodeBuilderFlags["AllowAnonymousIdentifier"] = 131072] = "AllowAnonymousIdentifier";
+        NodeBuilderFlags[NodeBuilderFlags["AllowEmptyUnionOrIntersection"] = 262144] = "AllowEmptyUnionOrIntersection";
+        NodeBuilderFlags[NodeBuilderFlags["AllowEmptyTuple"] = 524288] = "AllowEmptyTuple";
+        NodeBuilderFlags[NodeBuilderFlags["AllowUniqueESSymbolType"] = 1048576] = "AllowUniqueESSymbolType";
+        NodeBuilderFlags[NodeBuilderFlags["AllowEmptyIndexInfoType"] = 2097152] = "AllowEmptyIndexInfoType";
+        NodeBuilderFlags[NodeBuilderFlags["IgnoreErrors"] = 3112960] = "IgnoreErrors";
+        // State
+        NodeBuilderFlags[NodeBuilderFlags["InObjectTypeLiteral"] = 4194304] = "InObjectTypeLiteral";
+        NodeBuilderFlags[NodeBuilderFlags["InTypeAlias"] = 8388608] = "InTypeAlias";
+        NodeBuilderFlags[NodeBuilderFlags["InInitialEntityName"] = 16777216] = "InInitialEntityName";
+        NodeBuilderFlags[NodeBuilderFlags["InReverseMappedType"] = 33554432] = "InReverseMappedType";
+    })(NodeBuilderFlags = ts.NodeBuilderFlags || (ts.NodeBuilderFlags = {}));
+    // Ensure the shared flags between this and `NodeBuilderFlags` stay in alignment
+    var TypeFormatFlags;
+    (function (TypeFormatFlags) {
+        TypeFormatFlags[TypeFormatFlags["None"] = 0] = "None";
+        TypeFormatFlags[TypeFormatFlags["NoTruncation"] = 1] = "NoTruncation";
+        TypeFormatFlags[TypeFormatFlags["WriteArrayAsGenericType"] = 2] = "WriteArrayAsGenericType";
+        // hole because there's a hole in node builder flags
+        TypeFormatFlags[TypeFormatFlags["UseStructuralFallback"] = 8] = "UseStructuralFallback";
+        // hole because there's a hole in node builder flags
+        TypeFormatFlags[TypeFormatFlags["WriteTypeArgumentsOfSignature"] = 32] = "WriteTypeArgumentsOfSignature";
+        TypeFormatFlags[TypeFormatFlags["UseFullyQualifiedType"] = 64] = "UseFullyQualifiedType";
+        // hole because `UseOnlyExternalAliasing` is here in node builder flags, but functions which take old flags use `SymbolFormatFlags` instead
+        TypeFormatFlags[TypeFormatFlags["SuppressAnyReturnType"] = 256] = "SuppressAnyReturnType";
+        // hole because `WriteTypeParametersInQualifiedName` is here in node builder flags, but functions which take old flags use `SymbolFormatFlags` for this instead
+        TypeFormatFlags[TypeFormatFlags["MultilineObjectLiterals"] = 1024] = "MultilineObjectLiterals";
+        TypeFormatFlags[TypeFormatFlags["WriteClassExpressionAsTypeLiteral"] = 2048] = "WriteClassExpressionAsTypeLiteral";
+        TypeFormatFlags[TypeFormatFlags["UseTypeOfFunction"] = 4096] = "UseTypeOfFunction";
+        TypeFormatFlags[TypeFormatFlags["OmitParameterModifiers"] = 8192] = "OmitParameterModifiers";
+        TypeFormatFlags[TypeFormatFlags["UseAliasDefinedOutsideCurrentScope"] = 16384] = "UseAliasDefinedOutsideCurrentScope";
+        // even though `T` can't be accessed in the current scope.
+        // Error Handling
+        TypeFormatFlags[TypeFormatFlags["AllowUniqueESSymbolType"] = 1048576] = "AllowUniqueESSymbolType";
+        // TypeFormatFlags exclusive
+        TypeFormatFlags[TypeFormatFlags["AddUndefined"] = 131072] = "AddUndefined";
+        TypeFormatFlags[TypeFormatFlags["WriteArrowStyleSignature"] = 262144] = "WriteArrowStyleSignature";
+        // State
+        TypeFormatFlags[TypeFormatFlags["InArrayType"] = 524288] = "InArrayType";
+        TypeFormatFlags[TypeFormatFlags["InElementType"] = 2097152] = "InElementType";
+        TypeFormatFlags[TypeFormatFlags["InFirstTypeArgument"] = 4194304] = "InFirstTypeArgument";
+        TypeFormatFlags[TypeFormatFlags["InTypeAlias"] = 8388608] = "InTypeAlias";
+        /** @deprecated */ TypeFormatFlags[TypeFormatFlags["WriteOwnNameForAnyLike"] = 0] = "WriteOwnNameForAnyLike";
+        TypeFormatFlags[TypeFormatFlags["NodeBuilderFlagsMask"] = 9469291] = "NodeBuilderFlagsMask";
+    })(TypeFormatFlags = ts.TypeFormatFlags || (ts.TypeFormatFlags = {}));
+    var SymbolFormatFlags;
+    (function (SymbolFormatFlags) {
+        SymbolFormatFlags[SymbolFormatFlags["None"] = 0] = "None";
+        // Write symbols's type argument if it is instantiated symbol
+        // eg. class C<T> { p: T }   <-- Show p as C<T>.p here
+        //     var a: C<number>;
+        //     var p = a.p; <--- Here p is property of C<number> so show it as C<number>.p instead of just C.p
+        SymbolFormatFlags[SymbolFormatFlags["WriteTypeParametersOrArguments"] = 1] = "WriteTypeParametersOrArguments";
+        // Use only external alias information to get the symbol name in the given context
+        // eg.  module m { export class c { } } import x = m.c;
+        // When this flag is specified m.c will be used to refer to the class instead of alias symbol x
+        SymbolFormatFlags[SymbolFormatFlags["UseOnlyExternalAliasing"] = 2] = "UseOnlyExternalAliasing";
+        // Build symbol name using any nodes needed, instead of just components of an entity name
+        SymbolFormatFlags[SymbolFormatFlags["AllowAnyNodeKind"] = 4] = "AllowAnyNodeKind";
+        // Prefer aliases which are not directly visible
+        SymbolFormatFlags[SymbolFormatFlags["UseAliasDefinedOutsideCurrentScope"] = 8] = "UseAliasDefinedOutsideCurrentScope";
+    })(SymbolFormatFlags = ts.SymbolFormatFlags || (ts.SymbolFormatFlags = {}));
+    /* @internal */
+    var SymbolAccessibility;
+    (function (SymbolAccessibility) {
+        SymbolAccessibility[SymbolAccessibility["Accessible"] = 0] = "Accessible";
+        SymbolAccessibility[SymbolAccessibility["NotAccessible"] = 1] = "NotAccessible";
+        SymbolAccessibility[SymbolAccessibility["CannotBeNamed"] = 2] = "CannotBeNamed";
+    })(SymbolAccessibility = ts.SymbolAccessibility || (ts.SymbolAccessibility = {}));
+    /* @internal */
+    var SyntheticSymbolKind;
+    (function (SyntheticSymbolKind) {
+        SyntheticSymbolKind[SyntheticSymbolKind["UnionOrIntersection"] = 0] = "UnionOrIntersection";
+        SyntheticSymbolKind[SyntheticSymbolKind["Spread"] = 1] = "Spread";
+    })(SyntheticSymbolKind = ts.SyntheticSymbolKind || (ts.SyntheticSymbolKind = {}));
+    var TypePredicateKind;
+    (function (TypePredicateKind) {
+        TypePredicateKind[TypePredicateKind["This"] = 0] = "This";
+        TypePredicateKind[TypePredicateKind["Identifier"] = 1] = "Identifier";
+    })(TypePredicateKind = ts.TypePredicateKind || (ts.TypePredicateKind = {}));
+    /** Indicates how to serialize the name for a TypeReferenceNode when emitting decorator metadata */
+    /* @internal */
+    var TypeReferenceSerializationKind;
+    (function (TypeReferenceSerializationKind) {
+        TypeReferenceSerializationKind[TypeReferenceSerializationKind["Unknown"] = 0] = "Unknown";
+        // should be emitted using a safe fallback.
+        TypeReferenceSerializationKind[TypeReferenceSerializationKind["TypeWithConstructSignatureAndValue"] = 1] = "TypeWithConstructSignatureAndValue";
+        // function that can be reached at runtime (e.g. a `class`
+        // declaration or a `var` declaration for the static side
+        // of a type, such as the global `Promise` type in lib.d.ts).
+        TypeReferenceSerializationKind[TypeReferenceSerializationKind["VoidNullableOrNeverType"] = 2] = "VoidNullableOrNeverType";
+        TypeReferenceSerializationKind[TypeReferenceSerializationKind["NumberLikeType"] = 3] = "NumberLikeType";
+        TypeReferenceSerializationKind[TypeReferenceSerializationKind["StringLikeType"] = 4] = "StringLikeType";
+        TypeReferenceSerializationKind[TypeReferenceSerializationKind["BooleanType"] = 5] = "BooleanType";
+        TypeReferenceSerializationKind[TypeReferenceSerializationKind["ArrayLikeType"] = 6] = "ArrayLikeType";
+        TypeReferenceSerializationKind[TypeReferenceSerializationKind["ESSymbolType"] = 7] = "ESSymbolType";
+        TypeReferenceSerializationKind[TypeReferenceSerializationKind["Promise"] = 8] = "Promise";
+        TypeReferenceSerializationKind[TypeReferenceSerializationKind["TypeWithCallSignature"] = 9] = "TypeWithCallSignature";
+        // with call signatures.
+        TypeReferenceSerializationKind[TypeReferenceSerializationKind["ObjectType"] = 10] = "ObjectType";
+    })(TypeReferenceSerializationKind = ts.TypeReferenceSerializationKind || (ts.TypeReferenceSerializationKind = {}));
+    var SymbolFlags;
+    (function (SymbolFlags) {
+        SymbolFlags[SymbolFlags["None"] = 0] = "None";
+        SymbolFlags[SymbolFlags["FunctionScopedVariable"] = 1] = "FunctionScopedVariable";
+        SymbolFlags[SymbolFlags["BlockScopedVariable"] = 2] = "BlockScopedVariable";
+        SymbolFlags[SymbolFlags["Property"] = 4] = "Property";
+        SymbolFlags[SymbolFlags["EnumMember"] = 8] = "EnumMember";
+        SymbolFlags[SymbolFlags["Function"] = 16] = "Function";
+        SymbolFlags[SymbolFlags["Class"] = 32] = "Class";
+        SymbolFlags[SymbolFlags["Interface"] = 64] = "Interface";
+        SymbolFlags[SymbolFlags["ConstEnum"] = 128] = "ConstEnum";
+        SymbolFlags[SymbolFlags["RegularEnum"] = 256] = "RegularEnum";
+        SymbolFlags[SymbolFlags["ValueModule"] = 512] = "ValueModule";
+        SymbolFlags[SymbolFlags["NamespaceModule"] = 1024] = "NamespaceModule";
+        SymbolFlags[SymbolFlags["TypeLiteral"] = 2048] = "TypeLiteral";
+        SymbolFlags[SymbolFlags["ObjectLiteral"] = 4096] = "ObjectLiteral";
+        SymbolFlags[SymbolFlags["Method"] = 8192] = "Method";
+        SymbolFlags[SymbolFlags["Constructor"] = 16384] = "Constructor";
+        SymbolFlags[SymbolFlags["GetAccessor"] = 32768] = "GetAccessor";
+        SymbolFlags[SymbolFlags["SetAccessor"] = 65536] = "SetAccessor";
+        SymbolFlags[SymbolFlags["Signature"] = 131072] = "Signature";
+        SymbolFlags[SymbolFlags["TypeParameter"] = 262144] = "TypeParameter";
+        SymbolFlags[SymbolFlags["TypeAlias"] = 524288] = "TypeAlias";
+        SymbolFlags[SymbolFlags["ExportValue"] = 1048576] = "ExportValue";
+        SymbolFlags[SymbolFlags["Alias"] = 2097152] = "Alias";
+        SymbolFlags[SymbolFlags["Prototype"] = 4194304] = "Prototype";
+        SymbolFlags[SymbolFlags["ExportStar"] = 8388608] = "ExportStar";
+        SymbolFlags[SymbolFlags["Optional"] = 16777216] = "Optional";
+        SymbolFlags[SymbolFlags["Transient"] = 33554432] = "Transient";
+        SymbolFlags[SymbolFlags["JSContainer"] = 67108864] = "JSContainer";
+        /* @internal */
+        SymbolFlags[SymbolFlags["All"] = 67108863] = "All";
+        SymbolFlags[SymbolFlags["Enum"] = 384] = "Enum";
+        SymbolFlags[SymbolFlags["Variable"] = 3] = "Variable";
+        SymbolFlags[SymbolFlags["Value"] = 67216319] = "Value";
+        SymbolFlags[SymbolFlags["Type"] = 67901928] = "Type";
+        SymbolFlags[SymbolFlags["Namespace"] = 1920] = "Namespace";
+        SymbolFlags[SymbolFlags["Module"] = 1536] = "Module";
+        SymbolFlags[SymbolFlags["Accessor"] = 98304] = "Accessor";
+        // Variables can be redeclared, but can not redeclare a block-scoped declaration with the
+        // same name, or any other value that is not a variable, e.g. ValueModule or Class
+        SymbolFlags[SymbolFlags["FunctionScopedVariableExcludes"] = 67216318] = "FunctionScopedVariableExcludes";
+        // Block-scoped declarations are not allowed to be re-declared
+        // they can not merge with anything in the value space
+        SymbolFlags[SymbolFlags["BlockScopedVariableExcludes"] = 67216319] = "BlockScopedVariableExcludes";
+        SymbolFlags[SymbolFlags["ParameterExcludes"] = 67216319] = "ParameterExcludes";
+        SymbolFlags[SymbolFlags["PropertyExcludes"] = 0] = "PropertyExcludes";
+        SymbolFlags[SymbolFlags["EnumMemberExcludes"] = 68008959] = "EnumMemberExcludes";
+        SymbolFlags[SymbolFlags["FunctionExcludes"] = 67215791] = "FunctionExcludes";
+        SymbolFlags[SymbolFlags["ClassExcludes"] = 68008383] = "ClassExcludes";
+        SymbolFlags[SymbolFlags["InterfaceExcludes"] = 67901832] = "InterfaceExcludes";
+        SymbolFlags[SymbolFlags["RegularEnumExcludes"] = 68008191] = "RegularEnumExcludes";
+        SymbolFlags[SymbolFlags["ConstEnumExcludes"] = 68008831] = "ConstEnumExcludes";
+        SymbolFlags[SymbolFlags["ValueModuleExcludes"] = 67215503] = "ValueModuleExcludes";
+        SymbolFlags[SymbolFlags["NamespaceModuleExcludes"] = 0] = "NamespaceModuleExcludes";
+        SymbolFlags[SymbolFlags["MethodExcludes"] = 67208127] = "MethodExcludes";
+        SymbolFlags[SymbolFlags["GetAccessorExcludes"] = 67150783] = "GetAccessorExcludes";
+        SymbolFlags[SymbolFlags["SetAccessorExcludes"] = 67183551] = "SetAccessorExcludes";
+        SymbolFlags[SymbolFlags["TypeParameterExcludes"] = 67639784] = "TypeParameterExcludes";
+        SymbolFlags[SymbolFlags["TypeAliasExcludes"] = 67901928] = "TypeAliasExcludes";
+        SymbolFlags[SymbolFlags["AliasExcludes"] = 2097152] = "AliasExcludes";
+        SymbolFlags[SymbolFlags["ModuleMember"] = 2623475] = "ModuleMember";
+        SymbolFlags[SymbolFlags["ExportHasLocal"] = 944] = "ExportHasLocal";
+        SymbolFlags[SymbolFlags["HasExports"] = 1952] = "HasExports";
+        SymbolFlags[SymbolFlags["HasMembers"] = 6240] = "HasMembers";
+        SymbolFlags[SymbolFlags["BlockScoped"] = 418] = "BlockScoped";
+        SymbolFlags[SymbolFlags["PropertyOrAccessor"] = 98308] = "PropertyOrAccessor";
+        SymbolFlags[SymbolFlags["ClassMember"] = 106500] = "ClassMember";
+        /* @internal */
+        // The set of things we consider semantically classifiable.  Used to speed up the LS during
+        // classification.
+        SymbolFlags[SymbolFlags["Classifiable"] = 2885600] = "Classifiable";
+        /* @internal */
+        SymbolFlags[SymbolFlags["LateBindingContainer"] = 6240] = "LateBindingContainer";
+    })(SymbolFlags = ts.SymbolFlags || (ts.SymbolFlags = {}));
+    /* @internal */
+    var EnumKind;
+    (function (EnumKind) {
+        EnumKind[EnumKind["Numeric"] = 0] = "Numeric";
+        EnumKind[EnumKind["Literal"] = 1] = "Literal"; // Literal enum (each member has a TypeFlags.EnumLiteral type)
+    })(EnumKind = ts.EnumKind || (ts.EnumKind = {}));
+    /* @internal */
+    var CheckFlags;
+    (function (CheckFlags) {
+        CheckFlags[CheckFlags["Instantiated"] = 1] = "Instantiated";
+        CheckFlags[CheckFlags["SyntheticProperty"] = 2] = "SyntheticProperty";
+        CheckFlags[CheckFlags["SyntheticMethod"] = 4] = "SyntheticMethod";
+        CheckFlags[CheckFlags["Readonly"] = 8] = "Readonly";
+        CheckFlags[CheckFlags["Partial"] = 16] = "Partial";
+        CheckFlags[CheckFlags["HasNonUniformType"] = 32] = "HasNonUniformType";
+        CheckFlags[CheckFlags["ContainsPublic"] = 64] = "ContainsPublic";
+        CheckFlags[CheckFlags["ContainsProtected"] = 128] = "ContainsProtected";
+        CheckFlags[CheckFlags["ContainsPrivate"] = 256] = "ContainsPrivate";
+        CheckFlags[CheckFlags["ContainsStatic"] = 512] = "ContainsStatic";
+        CheckFlags[CheckFlags["Late"] = 1024] = "Late";
+        CheckFlags[CheckFlags["ReverseMapped"] = 2048] = "ReverseMapped";
+        CheckFlags[CheckFlags["Synthetic"] = 6] = "Synthetic";
+    })(CheckFlags = ts.CheckFlags || (ts.CheckFlags = {}));
+    var InternalSymbolName;
+    (function (InternalSymbolName) {
+        InternalSymbolName["Call"] = "__call";
+        InternalSymbolName["Constructor"] = "__constructor";
+        InternalSymbolName["New"] = "__new";
+        InternalSymbolName["Index"] = "__index";
+        InternalSymbolName["ExportStar"] = "__export";
+        InternalSymbolName["Global"] = "__global";
+        InternalSymbolName["Missing"] = "__missing";
+        InternalSymbolName["Type"] = "__type";
+        InternalSymbolName["Object"] = "__object";
+        InternalSymbolName["JSXAttributes"] = "__jsxAttributes";
+        InternalSymbolName["Class"] = "__class";
+        InternalSymbolName["Function"] = "__function";
+        InternalSymbolName["Computed"] = "__computed";
+        InternalSymbolName["Resolving"] = "__resolving__";
+        InternalSymbolName["ExportEquals"] = "export=";
+        InternalSymbolName["Default"] = "default";
+    })(InternalSymbolName = ts.InternalSymbolName || (ts.InternalSymbolName = {}));
+    /* @internal */
+    var NodeCheckFlags;
+    (function (NodeCheckFlags) {
+        NodeCheckFlags[NodeCheckFlags["TypeChecked"] = 1] = "TypeChecked";
+        NodeCheckFlags[NodeCheckFlags["LexicalThis"] = 2] = "LexicalThis";
+        NodeCheckFlags[NodeCheckFlags["CaptureThis"] = 4] = "CaptureThis";
+        NodeCheckFlags[NodeCheckFlags["CaptureNewTarget"] = 8] = "CaptureNewTarget";
+        NodeCheckFlags[NodeCheckFlags["SuperInstance"] = 256] = "SuperInstance";
+        NodeCheckFlags[NodeCheckFlags["SuperStatic"] = 512] = "SuperStatic";
+        NodeCheckFlags[NodeCheckFlags["ContextChecked"] = 1024] = "ContextChecked";
+        NodeCheckFlags[NodeCheckFlags["AsyncMethodWithSuper"] = 2048] = "AsyncMethodWithSuper";
+        NodeCheckFlags[NodeCheckFlags["AsyncMethodWithSuperBinding"] = 4096] = "AsyncMethodWithSuperBinding";
+        NodeCheckFlags[NodeCheckFlags["CaptureArguments"] = 8192] = "CaptureArguments";
+        NodeCheckFlags[NodeCheckFlags["EnumValuesComputed"] = 16384] = "EnumValuesComputed";
+        NodeCheckFlags[NodeCheckFlags["LexicalModuleMergesWithClass"] = 32768] = "LexicalModuleMergesWithClass";
+        NodeCheckFlags[NodeCheckFlags["LoopWithCapturedBlockScopedBinding"] = 65536] = "LoopWithCapturedBlockScopedBinding";
+        NodeCheckFlags[NodeCheckFlags["CapturedBlockScopedBinding"] = 131072] = "CapturedBlockScopedBinding";
+        NodeCheckFlags[NodeCheckFlags["BlockScopedBindingInLoop"] = 262144] = "BlockScopedBindingInLoop";
+        NodeCheckFlags[NodeCheckFlags["ClassWithBodyScopedClassBinding"] = 524288] = "ClassWithBodyScopedClassBinding";
+        NodeCheckFlags[NodeCheckFlags["BodyScopedClassBinding"] = 1048576] = "BodyScopedClassBinding";
+        NodeCheckFlags[NodeCheckFlags["NeedsLoopOutParameter"] = 2097152] = "NeedsLoopOutParameter";
+        NodeCheckFlags[NodeCheckFlags["AssignmentsMarked"] = 4194304] = "AssignmentsMarked";
+        NodeCheckFlags[NodeCheckFlags["ClassWithConstructorReference"] = 8388608] = "ClassWithConstructorReference";
+        NodeCheckFlags[NodeCheckFlags["ConstructorReferenceInClass"] = 16777216] = "ConstructorReferenceInClass";
+    })(NodeCheckFlags = ts.NodeCheckFlags || (ts.NodeCheckFlags = {}));
+    var TypeFlags;
+    (function (TypeFlags) {
+        TypeFlags[TypeFlags["Any"] = 1] = "Any";
+        TypeFlags[TypeFlags["Unknown"] = 2] = "Unknown";
+        TypeFlags[TypeFlags["String"] = 4] = "String";
+        TypeFlags[TypeFlags["Number"] = 8] = "Number";
+        TypeFlags[TypeFlags["Boolean"] = 16] = "Boolean";
+        TypeFlags[TypeFlags["Enum"] = 32] = "Enum";
+        TypeFlags[TypeFlags["StringLiteral"] = 64] = "StringLiteral";
+        TypeFlags[TypeFlags["NumberLiteral"] = 128] = "NumberLiteral";
+        TypeFlags[TypeFlags["BooleanLiteral"] = 256] = "BooleanLiteral";
+        TypeFlags[TypeFlags["EnumLiteral"] = 512] = "EnumLiteral";
+        TypeFlags[TypeFlags["ESSymbol"] = 1024] = "ESSymbol";
+        TypeFlags[TypeFlags["UniqueESSymbol"] = 2048] = "UniqueESSymbol";
+        TypeFlags[TypeFlags["Void"] = 4096] = "Void";
+        TypeFlags[TypeFlags["Undefined"] = 8192] = "Undefined";
+        TypeFlags[TypeFlags["Null"] = 16384] = "Null";
+        TypeFlags[TypeFlags["Never"] = 32768] = "Never";
+        TypeFlags[TypeFlags["TypeParameter"] = 65536] = "TypeParameter";
+        TypeFlags[TypeFlags["Object"] = 131072] = "Object";
+        TypeFlags[TypeFlags["Union"] = 262144] = "Union";
+        TypeFlags[TypeFlags["Intersection"] = 524288] = "Intersection";
+        TypeFlags[TypeFlags["Index"] = 1048576] = "Index";
+        TypeFlags[TypeFlags["IndexedAccess"] = 2097152] = "IndexedAccess";
+        TypeFlags[TypeFlags["Conditional"] = 4194304] = "Conditional";
+        TypeFlags[TypeFlags["Substitution"] = 8388608] = "Substitution";
+        TypeFlags[TypeFlags["NonPrimitive"] = 16777216] = "NonPrimitive";
+        /* @internal */
+        TypeFlags[TypeFlags["FreshLiteral"] = 33554432] = "FreshLiteral";
+        /* @internal */
+        TypeFlags[TypeFlags["UnionOfUnitTypes"] = 67108864] = "UnionOfUnitTypes";
+        /* @internal */
+        TypeFlags[TypeFlags["ContainsWideningType"] = 134217728] = "ContainsWideningType";
+        /* @internal */
+        TypeFlags[TypeFlags["ContainsObjectLiteral"] = 268435456] = "ContainsObjectLiteral";
+        /* @internal */
+        TypeFlags[TypeFlags["ContainsAnyFunctionType"] = 536870912] = "ContainsAnyFunctionType";
+        /* @internal */
+        TypeFlags[TypeFlags["AnyOrUnknown"] = 3] = "AnyOrUnknown";
+        /* @internal */
+        TypeFlags[TypeFlags["Nullable"] = 24576] = "Nullable";
+        TypeFlags[TypeFlags["Literal"] = 448] = "Literal";
+        TypeFlags[TypeFlags["Unit"] = 27072] = "Unit";
+        TypeFlags[TypeFlags["StringOrNumberLiteral"] = 192] = "StringOrNumberLiteral";
+        /* @internal */
+        TypeFlags[TypeFlags["StringOrNumberLiteralOrUnique"] = 2240] = "StringOrNumberLiteralOrUnique";
+        /* @internal */
+        TypeFlags[TypeFlags["DefinitelyFalsy"] = 29120] = "DefinitelyFalsy";
+        TypeFlags[TypeFlags["PossiblyFalsy"] = 29148] = "PossiblyFalsy";
+        /* @internal */
+        TypeFlags[TypeFlags["Intrinsic"] = 16839967] = "Intrinsic";
+        /* @internal */
+        TypeFlags[TypeFlags["Primitive"] = 32764] = "Primitive";
+        TypeFlags[TypeFlags["StringLike"] = 68] = "StringLike";
+        TypeFlags[TypeFlags["NumberLike"] = 168] = "NumberLike";
+        TypeFlags[TypeFlags["BooleanLike"] = 272] = "BooleanLike";
+        TypeFlags[TypeFlags["EnumLike"] = 544] = "EnumLike";
+        TypeFlags[TypeFlags["ESSymbolLike"] = 3072] = "ESSymbolLike";
+        TypeFlags[TypeFlags["VoidLike"] = 12288] = "VoidLike";
+        /* @internal */
+        TypeFlags[TypeFlags["DisjointDomains"] = 16809468] = "DisjointDomains";
+        TypeFlags[TypeFlags["UnionOrIntersection"] = 786432] = "UnionOrIntersection";
+        TypeFlags[TypeFlags["StructuredType"] = 917504] = "StructuredType";
+        TypeFlags[TypeFlags["TypeVariable"] = 2162688] = "TypeVariable";
+        TypeFlags[TypeFlags["InstantiableNonPrimitive"] = 14745600] = "InstantiableNonPrimitive";
+        TypeFlags[TypeFlags["InstantiablePrimitive"] = 1048576] = "InstantiablePrimitive";
+        TypeFlags[TypeFlags["Instantiable"] = 15794176] = "Instantiable";
+        TypeFlags[TypeFlags["StructuredOrInstantiable"] = 16711680] = "StructuredOrInstantiable";
+        // 'Narrowable' types are types where narrowing actually narrows.
+        // This *should* be every type other than null, undefined, void, and never
+        TypeFlags[TypeFlags["Narrowable"] = 33492479] = "Narrowable";
+        TypeFlags[TypeFlags["NotUnionOrUnit"] = 16909315] = "NotUnionOrUnit";
+        /* @internal */
+        TypeFlags[TypeFlags["NotUnit"] = 16749629] = "NotUnit";
+        /* @internal */
+        TypeFlags[TypeFlags["RequiresWidening"] = 402653184] = "RequiresWidening";
+        /* @internal */
+        TypeFlags[TypeFlags["PropagatingFlags"] = 939524096] = "PropagatingFlags";
+        // The following flags are used for different purposes during union and intersection type construction
+        /* @internal */
+        TypeFlags[TypeFlags["NonWideningType"] = 134217728] = "NonWideningType";
+        /* @internal */
+        TypeFlags[TypeFlags["Wildcard"] = 268435456] = "Wildcard";
+        /* @internal */
+        TypeFlags[TypeFlags["EmptyObject"] = 536870912] = "EmptyObject";
+        /* @internal */
+        TypeFlags[TypeFlags["ConstructionFlags"] = 939524096] = "ConstructionFlags";
+        // The following flag is used for different purposes by maybeTypeOfKind
+        /* @internal */
+        TypeFlags[TypeFlags["GenericMappedType"] = 134217728] = "GenericMappedType";
+    })(TypeFlags = ts.TypeFlags || (ts.TypeFlags = {}));
+    var ObjectFlags;
+    (function (ObjectFlags) {
+        ObjectFlags[ObjectFlags["Class"] = 1] = "Class";
+        ObjectFlags[ObjectFlags["Interface"] = 2] = "Interface";
+        ObjectFlags[ObjectFlags["Reference"] = 4] = "Reference";
+        ObjectFlags[ObjectFlags["Tuple"] = 8] = "Tuple";
+        ObjectFlags[ObjectFlags["Anonymous"] = 16] = "Anonymous";
+        ObjectFlags[ObjectFlags["Mapped"] = 32] = "Mapped";
+        ObjectFlags[ObjectFlags["Instantiated"] = 64] = "Instantiated";
+        ObjectFlags[ObjectFlags["ObjectLiteral"] = 128] = "ObjectLiteral";
+        ObjectFlags[ObjectFlags["EvolvingArray"] = 256] = "EvolvingArray";
+        ObjectFlags[ObjectFlags["ObjectLiteralPatternWithComputedProperties"] = 512] = "ObjectLiteralPatternWithComputedProperties";
+        ObjectFlags[ObjectFlags["ContainsSpread"] = 1024] = "ContainsSpread";
+        ObjectFlags[ObjectFlags["ReverseMapped"] = 2048] = "ReverseMapped";
+        ObjectFlags[ObjectFlags["JsxAttributes"] = 4096] = "JsxAttributes";
+        ObjectFlags[ObjectFlags["MarkerType"] = 8192] = "MarkerType";
+        ObjectFlags[ObjectFlags["ClassOrInterface"] = 3] = "ClassOrInterface";
+    })(ObjectFlags = ts.ObjectFlags || (ts.ObjectFlags = {}));
+    /* @internal */
+    var Variance;
+    (function (Variance) {
+        Variance[Variance["Invariant"] = 0] = "Invariant";
+        Variance[Variance["Covariant"] = 1] = "Covariant";
+        Variance[Variance["Contravariant"] = 2] = "Contravariant";
+        Variance[Variance["Bivariant"] = 3] = "Bivariant";
+        Variance[Variance["Independent"] = 4] = "Independent";
+    })(Variance = ts.Variance || (ts.Variance = {}));
+    var SignatureKind;
+    (function (SignatureKind) {
+        SignatureKind[SignatureKind["Call"] = 0] = "Call";
+        SignatureKind[SignatureKind["Construct"] = 1] = "Construct";
+    })(SignatureKind = ts.SignatureKind || (ts.SignatureKind = {}));
+    var IndexKind;
+    (function (IndexKind) {
+        IndexKind[IndexKind["String"] = 0] = "String";
+        IndexKind[IndexKind["Number"] = 1] = "Number";
+    })(IndexKind = ts.IndexKind || (ts.IndexKind = {}));
+    var InferencePriority;
+    (function (InferencePriority) {
+        InferencePriority[InferencePriority["NakedTypeVariable"] = 1] = "NakedTypeVariable";
+        InferencePriority[InferencePriority["HomomorphicMappedType"] = 2] = "HomomorphicMappedType";
+        InferencePriority[InferencePriority["MappedTypeConstraint"] = 4] = "MappedTypeConstraint";
+        InferencePriority[InferencePriority["ReturnType"] = 8] = "ReturnType";
+        InferencePriority[InferencePriority["LiteralKeyof"] = 16] = "LiteralKeyof";
+        InferencePriority[InferencePriority["NoConstraints"] = 32] = "NoConstraints";
+        InferencePriority[InferencePriority["AlwaysStrict"] = 64] = "AlwaysStrict";
+        InferencePriority[InferencePriority["PriorityImpliesCombination"] = 28] = "PriorityImpliesCombination";
+    })(InferencePriority = ts.InferencePriority || (ts.InferencePriority = {}));
+    /* @internal */
+    var InferenceFlags;
+    (function (InferenceFlags) {
+        InferenceFlags[InferenceFlags["None"] = 0] = "None";
+        InferenceFlags[InferenceFlags["InferUnionTypes"] = 1] = "InferUnionTypes";
+        InferenceFlags[InferenceFlags["NoDefault"] = 2] = "NoDefault";
+        InferenceFlags[InferenceFlags["AnyDefault"] = 4] = "AnyDefault";
+    })(InferenceFlags = ts.InferenceFlags || (ts.InferenceFlags = {}));
+    /**
+     * Ternary values are defined such that
+     * x & y is False if either x or y is False.
+     * x & y is Maybe if either x or y is Maybe, but neither x or y is False.
+     * x & y is True if both x and y are True.
+     * x | y is False if both x and y are False.
+     * x | y is Maybe if either x or y is Maybe, but neither x or y is True.
+     * x | y is True if either x or y is True.
+     */
+    /* @internal */
+    var Ternary;
+    (function (Ternary) {
+        Ternary[Ternary["False"] = 0] = "False";
+        Ternary[Ternary["Maybe"] = 1] = "Maybe";
+        Ternary[Ternary["True"] = -1] = "True";
+    })(Ternary = ts.Ternary || (ts.Ternary = {}));
+    /* @internal */
+    var SpecialPropertyAssignmentKind;
+    (function (SpecialPropertyAssignmentKind) {
+        SpecialPropertyAssignmentKind[SpecialPropertyAssignmentKind["None"] = 0] = "None";
+        /// exports.name = expr
+        SpecialPropertyAssignmentKind[SpecialPropertyAssignmentKind["ExportsProperty"] = 1] = "ExportsProperty";
+        /// module.exports = expr
+        SpecialPropertyAssignmentKind[SpecialPropertyAssignmentKind["ModuleExports"] = 2] = "ModuleExports";
+        /// className.prototype.name = expr
+        SpecialPropertyAssignmentKind[SpecialPropertyAssignmentKind["PrototypeProperty"] = 3] = "PrototypeProperty";
+        /// this.name = expr
+        SpecialPropertyAssignmentKind[SpecialPropertyAssignmentKind["ThisProperty"] = 4] = "ThisProperty";
+        // F.name = expr
+        SpecialPropertyAssignmentKind[SpecialPropertyAssignmentKind["Property"] = 5] = "Property";
+        // F.prototype = { ... }
+        SpecialPropertyAssignmentKind[SpecialPropertyAssignmentKind["Prototype"] = 6] = "Prototype";
+    })(SpecialPropertyAssignmentKind = ts.SpecialPropertyAssignmentKind || (ts.SpecialPropertyAssignmentKind = {}));
+    var DiagnosticCategory;
+    (function (DiagnosticCategory) {
+        DiagnosticCategory[DiagnosticCategory["Warning"] = 0] = "Warning";
+        DiagnosticCategory[DiagnosticCategory["Error"] = 1] = "Error";
+        DiagnosticCategory[DiagnosticCategory["Suggestion"] = 2] = "Suggestion";
+        DiagnosticCategory[DiagnosticCategory["Message"] = 3] = "Message";
+    })(DiagnosticCategory = ts.DiagnosticCategory || (ts.DiagnosticCategory = {}));
+    /* @internal */
+    function diagnosticCategoryName(d, lowerCase) {
+        if (lowerCase === void 0) { lowerCase = true; }
+        var name = DiagnosticCategory[d.category];
+        return lowerCase ? name.toLowerCase() : name;
+    }
+    ts.diagnosticCategoryName = diagnosticCategoryName;
+    var ModuleResolutionKind;
+    (function (ModuleResolutionKind) {
+        ModuleResolutionKind[ModuleResolutionKind["Classic"] = 1] = "Classic";
+        ModuleResolutionKind[ModuleResolutionKind["NodeJs"] = 2] = "NodeJs";
+    })(ModuleResolutionKind = ts.ModuleResolutionKind || (ts.ModuleResolutionKind = {}));
+    var ModuleKind;
+    (function (ModuleKind) {
+        ModuleKind[ModuleKind["None"] = 0] = "None";
+        ModuleKind[ModuleKind["CommonJS"] = 1] = "CommonJS";
+        ModuleKind[ModuleKind["AMD"] = 2] = "AMD";
+        ModuleKind[ModuleKind["UMD"] = 3] = "UMD";
+        ModuleKind[ModuleKind["System"] = 4] = "System";
+        ModuleKind[ModuleKind["ES2015"] = 5] = "ES2015";
+        ModuleKind[ModuleKind["ESNext"] = 6] = "ESNext";
+    })(ModuleKind = ts.ModuleKind || (ts.ModuleKind = {}));
+    var JsxEmit;
+    (function (JsxEmit) {
+        JsxEmit[JsxEmit["None"] = 0] = "None";
+        JsxEmit[JsxEmit["Preserve"] = 1] = "Preserve";
+        JsxEmit[JsxEmit["React"] = 2] = "React";
+        JsxEmit[JsxEmit["ReactNative"] = 3] = "ReactNative";
+    })(JsxEmit = ts.JsxEmit || (ts.JsxEmit = {}));
+    var NewLineKind;
+    (function (NewLineKind) {
+        NewLineKind[NewLineKind["CarriageReturnLineFeed"] = 0] = "CarriageReturnLineFeed";
+        NewLineKind[NewLineKind["LineFeed"] = 1] = "LineFeed";
+    })(NewLineKind = ts.NewLineKind || (ts.NewLineKind = {}));
+    var ScriptKind;
+    (function (ScriptKind) {
+        ScriptKind[ScriptKind["Unknown"] = 0] = "Unknown";
+        ScriptKind[ScriptKind["JS"] = 1] = "JS";
+        ScriptKind[ScriptKind["JSX"] = 2] = "JSX";
+        ScriptKind[ScriptKind["TS"] = 3] = "TS";
+        ScriptKind[ScriptKind["TSX"] = 4] = "TSX";
+        ScriptKind[ScriptKind["External"] = 5] = "External";
+        ScriptKind[ScriptKind["JSON"] = 6] = "JSON";
+        /**
+         * Used on extensions that doesn't define the ScriptKind but the content defines it.
+         * Deferred extensions are going to be included in all project contexts.
+         */
+        ScriptKind[ScriptKind["Deferred"] = 7] = "Deferred";
+    })(ScriptKind = ts.ScriptKind || (ts.ScriptKind = {}));
+    var ScriptTarget;
+    (function (ScriptTarget) {
+        ScriptTarget[ScriptTarget["ES3"] = 0] = "ES3";
+        ScriptTarget[ScriptTarget["ES5"] = 1] = "ES5";
+        ScriptTarget[ScriptTarget["ES2015"] = 2] = "ES2015";
+        ScriptTarget[ScriptTarget["ES2016"] = 3] = "ES2016";
+        ScriptTarget[ScriptTarget["ES2017"] = 4] = "ES2017";
+        ScriptTarget[ScriptTarget["ES2018"] = 5] = "ES2018";
+        ScriptTarget[ScriptTarget["ESNext"] = 6] = "ESNext";
+        ScriptTarget[ScriptTarget["JSON"] = 100] = "JSON";
+        ScriptTarget[ScriptTarget["Latest"] = 6] = "Latest";
+    })(ScriptTarget = ts.ScriptTarget || (ts.ScriptTarget = {}));
+    var LanguageVariant;
+    (function (LanguageVariant) {
+        LanguageVariant[LanguageVariant["Standard"] = 0] = "Standard";
+        LanguageVariant[LanguageVariant["JSX"] = 1] = "JSX";
+    })(LanguageVariant = ts.LanguageVariant || (ts.LanguageVariant = {}));
+    var WatchDirectoryFlags;
+    (function (WatchDirectoryFlags) {
+        WatchDirectoryFlags[WatchDirectoryFlags["None"] = 0] = "None";
+        WatchDirectoryFlags[WatchDirectoryFlags["Recursive"] = 1] = "Recursive";
+    })(WatchDirectoryFlags = ts.WatchDirectoryFlags || (ts.WatchDirectoryFlags = {}));
+    /* @internal */
+    var CharacterCodes;
+    (function (CharacterCodes) {
+        CharacterCodes[CharacterCodes["nullCharacter"] = 0] = "nullCharacter";
+        CharacterCodes[CharacterCodes["maxAsciiCharacter"] = 127] = "maxAsciiCharacter";
+        CharacterCodes[CharacterCodes["lineFeed"] = 10] = "lineFeed";
+        CharacterCodes[CharacterCodes["carriageReturn"] = 13] = "carriageReturn";
+        CharacterCodes[CharacterCodes["lineSeparator"] = 8232] = "lineSeparator";
+        CharacterCodes[CharacterCodes["paragraphSeparator"] = 8233] = "paragraphSeparator";
+        CharacterCodes[CharacterCodes["nextLine"] = 133] = "nextLine";
+        // Unicode 3.0 space characters
+        CharacterCodes[CharacterCodes["space"] = 32] = "space";
+        CharacterCodes[CharacterCodes["nonBreakingSpace"] = 160] = "nonBreakingSpace";
+        CharacterCodes[CharacterCodes["enQuad"] = 8192] = "enQuad";
+        CharacterCodes[CharacterCodes["emQuad"] = 8193] = "emQuad";
+        CharacterCodes[CharacterCodes["enSpace"] = 8194] = "enSpace";
+        CharacterCodes[CharacterCodes["emSpace"] = 8195] = "emSpace";
+        CharacterCodes[CharacterCodes["threePerEmSpace"] = 8196] = "threePerEmSpace";
+        CharacterCodes[CharacterCodes["fourPerEmSpace"] = 8197] = "fourPerEmSpace";
+        CharacterCodes[CharacterCodes["sixPerEmSpace"] = 8198] = "sixPerEmSpace";
+        CharacterCodes[CharacterCodes["figureSpace"] = 8199] = "figureSpace";
+        CharacterCodes[CharacterCodes["punctuationSpace"] = 8200] = "punctuationSpace";
+        CharacterCodes[CharacterCodes["thinSpace"] = 8201] = "thinSpace";
+        CharacterCodes[CharacterCodes["hairSpace"] = 8202] = "hairSpace";
+        CharacterCodes[CharacterCodes["zeroWidthSpace"] = 8203] = "zeroWidthSpace";
+        CharacterCodes[CharacterCodes["narrowNoBreakSpace"] = 8239] = "narrowNoBreakSpace";
+        CharacterCodes[CharacterCodes["ideographicSpace"] = 12288] = "ideographicSpace";
+        CharacterCodes[CharacterCodes["mathematicalSpace"] = 8287] = "mathematicalSpace";
+        CharacterCodes[CharacterCodes["ogham"] = 5760] = "ogham";
+        CharacterCodes[CharacterCodes["_"] = 95] = "_";
+        CharacterCodes[CharacterCodes["$"] = 36] = "$";
+        CharacterCodes[CharacterCodes["_0"] = 48] = "_0";
+        CharacterCodes[CharacterCodes["_1"] = 49] = "_1";
+        CharacterCodes[CharacterCodes["_2"] = 50] = "_2";
+        CharacterCodes[CharacterCodes["_3"] = 51] = "_3";
+        CharacterCodes[CharacterCodes["_4"] = 52] = "_4";
+        CharacterCodes[CharacterCodes["_5"] = 53] = "_5";
+        CharacterCodes[CharacterCodes["_6"] = 54] = "_6";
+        CharacterCodes[CharacterCodes["_7"] = 55] = "_7";
+        CharacterCodes[CharacterCodes["_8"] = 56] = "_8";
+        CharacterCodes[CharacterCodes["_9"] = 57] = "_9";
+        CharacterCodes[CharacterCodes["a"] = 97] = "a";
+        CharacterCodes[CharacterCodes["b"] = 98] = "b";
+        CharacterCodes[CharacterCodes["c"] = 99] = "c";
+        CharacterCodes[CharacterCodes["d"] = 100] = "d";
+        CharacterCodes[CharacterCodes["e"] = 101] = "e";
+        CharacterCodes[CharacterCodes["f"] = 102] = "f";
+        CharacterCodes[CharacterCodes["g"] = 103] = "g";
+        CharacterCodes[CharacterCodes["h"] = 104] = "h";
+        CharacterCodes[CharacterCodes["i"] = 105] = "i";
+        CharacterCodes[CharacterCodes["j"] = 106] = "j";
+        CharacterCodes[CharacterCodes["k"] = 107] = "k";
+        CharacterCodes[CharacterCodes["l"] = 108] = "l";
+        CharacterCodes[CharacterCodes["m"] = 109] = "m";
+        CharacterCodes[CharacterCodes["n"] = 110] = "n";
+        CharacterCodes[CharacterCodes["o"] = 111] = "o";
+        CharacterCodes[CharacterCodes["p"] = 112] = "p";
+        CharacterCodes[CharacterCodes["q"] = 113] = "q";
+        CharacterCodes[CharacterCodes["r"] = 114] = "r";
+        CharacterCodes[CharacterCodes["s"] = 115] = "s";
+        CharacterCodes[CharacterCodes["t"] = 116] = "t";
+        CharacterCodes[CharacterCodes["u"] = 117] = "u";
+        CharacterCodes[CharacterCodes["v"] = 118] = "v";
+        CharacterCodes[CharacterCodes["w"] = 119] = "w";
+        CharacterCodes[CharacterCodes["x"] = 120] = "x";
+        CharacterCodes[CharacterCodes["y"] = 121] = "y";
+        CharacterCodes[CharacterCodes["z"] = 122] = "z";
+        CharacterCodes[CharacterCodes["A"] = 65] = "A";
+        CharacterCodes[CharacterCodes["B"] = 66] = "B";
+        CharacterCodes[CharacterCodes["C"] = 67] = "C";
+        CharacterCodes[CharacterCodes["D"] = 68] = "D";
+        CharacterCodes[CharacterCodes["E"] = 69] = "E";
+        CharacterCodes[CharacterCodes["F"] = 70] = "F";
+        CharacterCodes[CharacterCodes["G"] = 71] = "G";
+        CharacterCodes[CharacterCodes["H"] = 72] = "H";
+        CharacterCodes[CharacterCodes["I"] = 73] = "I";
+        CharacterCodes[CharacterCodes["J"] = 74] = "J";
+        CharacterCodes[CharacterCodes["K"] = 75] = "K";
+        CharacterCodes[CharacterCodes["L"] = 76] = "L";
+        CharacterCodes[CharacterCodes["M"] = 77] = "M";
+        CharacterCodes[CharacterCodes["N"] = 78] = "N";
+        CharacterCodes[CharacterCodes["O"] = 79] = "O";
+        CharacterCodes[CharacterCodes["P"] = 80] = "P";
+        CharacterCodes[CharacterCodes["Q"] = 81] = "Q";
+        CharacterCodes[CharacterCodes["R"] = 82] = "R";
+        CharacterCodes[CharacterCodes["S"] = 83] = "S";
+        CharacterCodes[CharacterCodes["T"] = 84] = "T";
+        CharacterCodes[CharacterCodes["U"] = 85] = "U";
+        CharacterCodes[CharacterCodes["V"] = 86] = "V";
+        CharacterCodes[CharacterCodes["W"] = 87] = "W";
+        CharacterCodes[CharacterCodes["X"] = 88] = "X";
+        CharacterCodes[CharacterCodes["Y"] = 89] = "Y";
+        CharacterCodes[CharacterCodes["Z"] = 90] = "Z";
+        CharacterCodes[CharacterCodes["ampersand"] = 38] = "ampersand";
+        CharacterCodes[CharacterCodes["asterisk"] = 42] = "asterisk";
+        CharacterCodes[CharacterCodes["at"] = 64] = "at";
+        CharacterCodes[CharacterCodes["backslash"] = 92] = "backslash";
+        CharacterCodes[CharacterCodes["backtick"] = 96] = "backtick";
+        CharacterCodes[CharacterCodes["bar"] = 124] = "bar";
+        CharacterCodes[CharacterCodes["caret"] = 94] = "caret";
+        CharacterCodes[CharacterCodes["closeBrace"] = 125] = "closeBrace";
+        CharacterCodes[CharacterCodes["closeBracket"] = 93] = "closeBracket";
+        CharacterCodes[CharacterCodes["closeParen"] = 41] = "closeParen";
+        CharacterCodes[CharacterCodes["colon"] = 58] = "colon";
+        CharacterCodes[CharacterCodes["comma"] = 44] = "comma";
+        CharacterCodes[CharacterCodes["dot"] = 46] = "dot";
+        CharacterCodes[CharacterCodes["doubleQuote"] = 34] = "doubleQuote";
+        CharacterCodes[CharacterCodes["equals"] = 61] = "equals";
+        CharacterCodes[CharacterCodes["exclamation"] = 33] = "exclamation";
+        CharacterCodes[CharacterCodes["greaterThan"] = 62] = "greaterThan";
+        CharacterCodes[CharacterCodes["hash"] = 35] = "hash";
+        CharacterCodes[CharacterCodes["lessThan"] = 60] = "lessThan";
+        CharacterCodes[CharacterCodes["minus"] = 45] = "minus";
+        CharacterCodes[CharacterCodes["openBrace"] = 123] = "openBrace";
+        CharacterCodes[CharacterCodes["openBracket"] = 91] = "openBracket";
+        CharacterCodes[CharacterCodes["openParen"] = 40] = "openParen";
+        CharacterCodes[CharacterCodes["percent"] = 37] = "percent";
+        CharacterCodes[CharacterCodes["plus"] = 43] = "plus";
+        CharacterCodes[CharacterCodes["question"] = 63] = "question";
+        CharacterCodes[CharacterCodes["semicolon"] = 59] = "semicolon";
+        CharacterCodes[CharacterCodes["singleQuote"] = 39] = "singleQuote";
+        CharacterCodes[CharacterCodes["slash"] = 47] = "slash";
+        CharacterCodes[CharacterCodes["tilde"] = 126] = "tilde";
+        CharacterCodes[CharacterCodes["backspace"] = 8] = "backspace";
+        CharacterCodes[CharacterCodes["formFeed"] = 12] = "formFeed";
+        CharacterCodes[CharacterCodes["byteOrderMark"] = 65279] = "byteOrderMark";
+        CharacterCodes[CharacterCodes["tab"] = 9] = "tab";
+        CharacterCodes[CharacterCodes["verticalTab"] = 11] = "verticalTab";
+    })(CharacterCodes = ts.CharacterCodes || (ts.CharacterCodes = {}));
+    var Extension;
+    (function (Extension) {
+        Extension["Ts"] = ".ts";
+        Extension["Tsx"] = ".tsx";
+        Extension["Dts"] = ".d.ts";
+        Extension["Js"] = ".js";
+        Extension["Jsx"] = ".jsx";
+        Extension["Json"] = ".json";
+    })(Extension = ts.Extension || (ts.Extension = {}));
+    /* @internal */
+    var TransformFlags;
+    (function (TransformFlags) {
+        TransformFlags[TransformFlags["None"] = 0] = "None";
+        // Facts
+        // - Flags used to indicate that a node or subtree contains syntax that requires transformation.
+        TransformFlags[TransformFlags["TypeScript"] = 1] = "TypeScript";
+        TransformFlags[TransformFlags["ContainsTypeScript"] = 2] = "ContainsTypeScript";
+        TransformFlags[TransformFlags["ContainsJsx"] = 4] = "ContainsJsx";
+        TransformFlags[TransformFlags["ContainsESNext"] = 8] = "ContainsESNext";
+        TransformFlags[TransformFlags["ContainsES2017"] = 16] = "ContainsES2017";
+        TransformFlags[TransformFlags["ContainsES2016"] = 32] = "ContainsES2016";
+        TransformFlags[TransformFlags["ES2015"] = 64] = "ES2015";
+        TransformFlags[TransformFlags["ContainsES2015"] = 128] = "ContainsES2015";
+        TransformFlags[TransformFlags["Generator"] = 256] = "Generator";
+        TransformFlags[TransformFlags["ContainsGenerator"] = 512] = "ContainsGenerator";
+        TransformFlags[TransformFlags["DestructuringAssignment"] = 1024] = "DestructuringAssignment";
+        TransformFlags[TransformFlags["ContainsDestructuringAssignment"] = 2048] = "ContainsDestructuringAssignment";
+        // Markers
+        // - Flags used to indicate that a subtree contains a specific transformation.
+        TransformFlags[TransformFlags["ContainsDecorators"] = 4096] = "ContainsDecorators";
+        TransformFlags[TransformFlags["ContainsPropertyInitializer"] = 8192] = "ContainsPropertyInitializer";
+        TransformFlags[TransformFlags["ContainsLexicalThis"] = 16384] = "ContainsLexicalThis";
+        TransformFlags[TransformFlags["ContainsCapturedLexicalThis"] = 32768] = "ContainsCapturedLexicalThis";
+        TransformFlags[TransformFlags["ContainsLexicalThisInComputedPropertyName"] = 65536] = "ContainsLexicalThisInComputedPropertyName";
+        TransformFlags[TransformFlags["ContainsDefaultValueAssignments"] = 131072] = "ContainsDefaultValueAssignments";
+        TransformFlags[TransformFlags["ContainsParameterPropertyAssignments"] = 262144] = "ContainsParameterPropertyAssignments";
+        TransformFlags[TransformFlags["ContainsSpread"] = 524288] = "ContainsSpread";
+        TransformFlags[TransformFlags["ContainsObjectSpread"] = 1048576] = "ContainsObjectSpread";
+        TransformFlags[TransformFlags["ContainsRest"] = 524288] = "ContainsRest";
+        TransformFlags[TransformFlags["ContainsObjectRest"] = 1048576] = "ContainsObjectRest";
+        TransformFlags[TransformFlags["ContainsComputedPropertyName"] = 2097152] = "ContainsComputedPropertyName";
+        TransformFlags[TransformFlags["ContainsBlockScopedBinding"] = 4194304] = "ContainsBlockScopedBinding";
+        TransformFlags[TransformFlags["ContainsBindingPattern"] = 8388608] = "ContainsBindingPattern";
+        TransformFlags[TransformFlags["ContainsYield"] = 16777216] = "ContainsYield";
+        TransformFlags[TransformFlags["ContainsHoistedDeclarationOrCompletion"] = 33554432] = "ContainsHoistedDeclarationOrCompletion";
+        TransformFlags[TransformFlags["ContainsDynamicImport"] = 67108864] = "ContainsDynamicImport";
+        TransformFlags[TransformFlags["Super"] = 134217728] = "Super";
+        TransformFlags[TransformFlags["ContainsSuper"] = 268435456] = "ContainsSuper";
+        // Please leave this as 1 << 29.
+        // It is the maximum bit we can set before we outgrow the size of a v8 small integer (SMI) on an x86 system.
+        // It is a good reminder of how much room we have left
+        TransformFlags[TransformFlags["HasComputedFlags"] = 536870912] = "HasComputedFlags";
+        // Assertions
+        // - Bitmasks that are used to assert facts about the syntax of a node and its subtree.
+        TransformFlags[TransformFlags["AssertTypeScript"] = 3] = "AssertTypeScript";
+        TransformFlags[TransformFlags["AssertJsx"] = 4] = "AssertJsx";
+        TransformFlags[TransformFlags["AssertESNext"] = 8] = "AssertESNext";
+        TransformFlags[TransformFlags["AssertES2017"] = 16] = "AssertES2017";
+        TransformFlags[TransformFlags["AssertES2016"] = 32] = "AssertES2016";
+        TransformFlags[TransformFlags["AssertES2015"] = 192] = "AssertES2015";
+        TransformFlags[TransformFlags["AssertGenerator"] = 768] = "AssertGenerator";
+        TransformFlags[TransformFlags["AssertDestructuringAssignment"] = 3072] = "AssertDestructuringAssignment";
+        // Scope Exclusions
+        // - Bitmasks that exclude flags from propagating out of a specific context
+        //   into the subtree flags of their container.
+        TransformFlags[TransformFlags["OuterExpressionExcludes"] = 536872257] = "OuterExpressionExcludes";
+        TransformFlags[TransformFlags["PropertyAccessExcludes"] = 671089985] = "PropertyAccessExcludes";
+        TransformFlags[TransformFlags["NodeExcludes"] = 939525441] = "NodeExcludes";
+        TransformFlags[TransformFlags["ArrowFunctionExcludes"] = 1003902273] = "ArrowFunctionExcludes";
+        TransformFlags[TransformFlags["FunctionExcludes"] = 1003935041] = "FunctionExcludes";
+        TransformFlags[TransformFlags["ConstructorExcludes"] = 1003668801] = "ConstructorExcludes";
+        TransformFlags[TransformFlags["MethodOrAccessorExcludes"] = 1003668801] = "MethodOrAccessorExcludes";
+        TransformFlags[TransformFlags["ClassExcludes"] = 942011713] = "ClassExcludes";
+        TransformFlags[TransformFlags["ModuleExcludes"] = 977327425] = "ModuleExcludes";
+        TransformFlags[TransformFlags["TypeExcludes"] = -3] = "TypeExcludes";
+        TransformFlags[TransformFlags["ObjectLiteralExcludes"] = 942740801] = "ObjectLiteralExcludes";
+        TransformFlags[TransformFlags["ArrayLiteralOrCallOrNewExcludes"] = 940049729] = "ArrayLiteralOrCallOrNewExcludes";
+        TransformFlags[TransformFlags["VariableDeclarationListExcludes"] = 948962625] = "VariableDeclarationListExcludes";
+        TransformFlags[TransformFlags["ParameterExcludes"] = 939525441] = "ParameterExcludes";
+        TransformFlags[TransformFlags["CatchClauseExcludes"] = 940574017] = "CatchClauseExcludes";
+        TransformFlags[TransformFlags["BindingPatternExcludes"] = 940049729] = "BindingPatternExcludes";
+        // Masks
+        // - Additional bitmasks
+        TransformFlags[TransformFlags["TypeScriptClassSyntaxMask"] = 274432] = "TypeScriptClassSyntaxMask";
+        TransformFlags[TransformFlags["ES2015FunctionSyntaxMask"] = 163840] = "ES2015FunctionSyntaxMask";
+    })(TransformFlags = ts.TransformFlags || (ts.TransformFlags = {}));
+    var EmitFlags;
+    (function (EmitFlags) {
+        EmitFlags[EmitFlags["None"] = 0] = "None";
+        EmitFlags[EmitFlags["SingleLine"] = 1] = "SingleLine";
+        EmitFlags[EmitFlags["AdviseOnEmitNode"] = 2] = "AdviseOnEmitNode";
+        EmitFlags[EmitFlags["NoSubstitution"] = 4] = "NoSubstitution";
+        EmitFlags[EmitFlags["CapturesThis"] = 8] = "CapturesThis";
+        EmitFlags[EmitFlags["NoLeadingSourceMap"] = 16] = "NoLeadingSourceMap";
+        EmitFlags[EmitFlags["NoTrailingSourceMap"] = 32] = "NoTrailingSourceMap";
+        EmitFlags[EmitFlags["NoSourceMap"] = 48] = "NoSourceMap";
+        EmitFlags[EmitFlags["NoNestedSourceMaps"] = 64] = "NoNestedSourceMaps";
+        EmitFlags[EmitFlags["NoTokenLeadingSourceMaps"] = 128] = "NoTokenLeadingSourceMaps";
+        EmitFlags[EmitFlags["NoTokenTrailingSourceMaps"] = 256] = "NoTokenTrailingSourceMaps";
+        EmitFlags[EmitFlags["NoTokenSourceMaps"] = 384] = "NoTokenSourceMaps";
+        EmitFlags[EmitFlags["NoLeadingComments"] = 512] = "NoLeadingComments";
+        EmitFlags[EmitFlags["NoTrailingComments"] = 1024] = "NoTrailingComments";
+        EmitFlags[EmitFlags["NoComments"] = 1536] = "NoComments";
+        EmitFlags[EmitFlags["NoNestedComments"] = 2048] = "NoNestedComments";
+        EmitFlags[EmitFlags["HelperName"] = 4096] = "HelperName";
+        EmitFlags[EmitFlags["ExportName"] = 8192] = "ExportName";
+        EmitFlags[EmitFlags["LocalName"] = 16384] = "LocalName";
+        EmitFlags[EmitFlags["InternalName"] = 32768] = "InternalName";
+        EmitFlags[EmitFlags["Indented"] = 65536] = "Indented";
+        EmitFlags[EmitFlags["NoIndentation"] = 131072] = "NoIndentation";
+        EmitFlags[EmitFlags["AsyncFunctionBody"] = 262144] = "AsyncFunctionBody";
+        EmitFlags[EmitFlags["ReuseTempVariableScope"] = 524288] = "ReuseTempVariableScope";
+        EmitFlags[EmitFlags["CustomPrologue"] = 1048576] = "CustomPrologue";
+        EmitFlags[EmitFlags["NoHoisting"] = 2097152] = "NoHoisting";
+        EmitFlags[EmitFlags["HasEndOfDeclarationMarker"] = 4194304] = "HasEndOfDeclarationMarker";
+        EmitFlags[EmitFlags["Iterator"] = 8388608] = "Iterator";
+        EmitFlags[EmitFlags["NoAsciiEscaping"] = 16777216] = "NoAsciiEscaping";
+        /*@internal*/ EmitFlags[EmitFlags["TypeScriptClassWrapper"] = 33554432] = "TypeScriptClassWrapper";
+        /*@internal*/ EmitFlags[EmitFlags["NeverApplyImportHelper"] = 67108864] = "NeverApplyImportHelper";
+    })(EmitFlags = ts.EmitFlags || (ts.EmitFlags = {}));
+    /**
+     * Used by the checker, this enum keeps track of external emit helpers that should be type
+     * checked.
+     */
+    /* @internal */
+    var ExternalEmitHelpers;
+    (function (ExternalEmitHelpers) {
+        ExternalEmitHelpers[ExternalEmitHelpers["Extends"] = 1] = "Extends";
+        ExternalEmitHelpers[ExternalEmitHelpers["Assign"] = 2] = "Assign";
+        ExternalEmitHelpers[ExternalEmitHelpers["Rest"] = 4] = "Rest";
+        ExternalEmitHelpers[ExternalEmitHelpers["Decorate"] = 8] = "Decorate";
+        ExternalEmitHelpers[ExternalEmitHelpers["Metadata"] = 16] = "Metadata";
+        ExternalEmitHelpers[ExternalEmitHelpers["Param"] = 32] = "Param";
+        ExternalEmitHelpers[ExternalEmitHelpers["Awaiter"] = 64] = "Awaiter";
+        ExternalEmitHelpers[ExternalEmitHelpers["Generator"] = 128] = "Generator";
+        ExternalEmitHelpers[ExternalEmitHelpers["Values"] = 256] = "Values";
+        ExternalEmitHelpers[ExternalEmitHelpers["Read"] = 512] = "Read";
+        ExternalEmitHelpers[ExternalEmitHelpers["Spread"] = 1024] = "Spread";
+        ExternalEmitHelpers[ExternalEmitHelpers["Await"] = 2048] = "Await";
+        ExternalEmitHelpers[ExternalEmitHelpers["AsyncGenerator"] = 4096] = "AsyncGenerator";
+        ExternalEmitHelpers[ExternalEmitHelpers["AsyncDelegator"] = 8192] = "AsyncDelegator";
+        ExternalEmitHelpers[ExternalEmitHelpers["AsyncValues"] = 16384] = "AsyncValues";
+        ExternalEmitHelpers[ExternalEmitHelpers["ExportStar"] = 32768] = "ExportStar";
+        ExternalEmitHelpers[ExternalEmitHelpers["MakeTemplateObject"] = 65536] = "MakeTemplateObject";
+        ExternalEmitHelpers[ExternalEmitHelpers["FirstEmitHelper"] = 1] = "FirstEmitHelper";
+        ExternalEmitHelpers[ExternalEmitHelpers["LastEmitHelper"] = 65536] = "LastEmitHelper";
+        // Helpers included by ES2015 for..of
+        ExternalEmitHelpers[ExternalEmitHelpers["ForOfIncludes"] = 256] = "ForOfIncludes";
+        // Helpers included by ES2017 for..await..of
+        ExternalEmitHelpers[ExternalEmitHelpers["ForAwaitOfIncludes"] = 16384] = "ForAwaitOfIncludes";
+        // Helpers included by ES2017 async generators
+        ExternalEmitHelpers[ExternalEmitHelpers["AsyncGeneratorIncludes"] = 6144] = "AsyncGeneratorIncludes";
+        // Helpers included by yield* in ES2017 async generators
+        ExternalEmitHelpers[ExternalEmitHelpers["AsyncDelegatorIncludes"] = 26624] = "AsyncDelegatorIncludes";
+        // Helpers included by ES2015 spread
+        ExternalEmitHelpers[ExternalEmitHelpers["SpreadIncludes"] = 1536] = "SpreadIncludes";
+    })(ExternalEmitHelpers = ts.ExternalEmitHelpers || (ts.ExternalEmitHelpers = {}));
+    var EmitHint;
+    (function (EmitHint) {
+        EmitHint[EmitHint["SourceFile"] = 0] = "SourceFile";
+        EmitHint[EmitHint["Expression"] = 1] = "Expression";
+        EmitHint[EmitHint["IdentifierName"] = 2] = "IdentifierName";
+        EmitHint[EmitHint["MappedTypeParameter"] = 3] = "MappedTypeParameter";
+        EmitHint[EmitHint["Unspecified"] = 4] = "Unspecified";
+    })(EmitHint = ts.EmitHint || (ts.EmitHint = {}));
+    var ListFormat;
+    (function (ListFormat) {
+        ListFormat[ListFormat["None"] = 0] = "None";
+        // Line separators
+        ListFormat[ListFormat["SingleLine"] = 0] = "SingleLine";
+        ListFormat[ListFormat["MultiLine"] = 1] = "MultiLine";
+        ListFormat[ListFormat["PreserveLines"] = 2] = "PreserveLines";
+        ListFormat[ListFormat["LinesMask"] = 3] = "LinesMask";
+        // Delimiters
+        ListFormat[ListFormat["NotDelimited"] = 0] = "NotDelimited";
+        ListFormat[ListFormat["BarDelimited"] = 4] = "BarDelimited";
+        ListFormat[ListFormat["AmpersandDelimited"] = 8] = "AmpersandDelimited";
+        ListFormat[ListFormat["CommaDelimited"] = 16] = "CommaDelimited";
+        ListFormat[ListFormat["DelimitersMask"] = 28] = "DelimitersMask";
+        ListFormat[ListFormat["AllowTrailingComma"] = 32] = "AllowTrailingComma";
+        // Whitespace
+        ListFormat[ListFormat["Indented"] = 64] = "Indented";
+        ListFormat[ListFormat["SpaceBetweenBraces"] = 128] = "SpaceBetweenBraces";
+        ListFormat[ListFormat["SpaceBetweenSiblings"] = 256] = "SpaceBetweenSiblings";
+        // Brackets/Braces
+        ListFormat[ListFormat["Braces"] = 512] = "Braces";
+        ListFormat[ListFormat["Parenthesis"] = 1024] = "Parenthesis";
+        ListFormat[ListFormat["AngleBrackets"] = 2048] = "AngleBrackets";
+        ListFormat[ListFormat["SquareBrackets"] = 4096] = "SquareBrackets";
+        ListFormat[ListFormat["BracketsMask"] = 7680] = "BracketsMask";
+        ListFormat[ListFormat["OptionalIfUndefined"] = 8192] = "OptionalIfUndefined";
+        ListFormat[ListFormat["OptionalIfEmpty"] = 16384] = "OptionalIfEmpty";
+        ListFormat[ListFormat["Optional"] = 24576] = "Optional";
+        // Other
+        ListFormat[ListFormat["PreferNewLine"] = 32768] = "PreferNewLine";
+        ListFormat[ListFormat["NoTrailingNewLine"] = 65536] = "NoTrailingNewLine";
+        ListFormat[ListFormat["NoInterveningComments"] = 131072] = "NoInterveningComments";
+        ListFormat[ListFormat["NoSpaceIfEmpty"] = 262144] = "NoSpaceIfEmpty";
+        ListFormat[ListFormat["SingleElement"] = 524288] = "SingleElement";
+        // Precomputed Formats
+        ListFormat[ListFormat["Modifiers"] = 131328] = "Modifiers";
+        ListFormat[ListFormat["HeritageClauses"] = 256] = "HeritageClauses";
+        ListFormat[ListFormat["SingleLineTypeLiteralMembers"] = 384] = "SingleLineTypeLiteralMembers";
+        ListFormat[ListFormat["MultiLineTypeLiteralMembers"] = 16449] = "MultiLineTypeLiteralMembers";
+        ListFormat[ListFormat["TupleTypeElements"] = 272] = "TupleTypeElements";
+        ListFormat[ListFormat["UnionTypeConstituents"] = 260] = "UnionTypeConstituents";
+        ListFormat[ListFormat["IntersectionTypeConstituents"] = 264] = "IntersectionTypeConstituents";
+        ListFormat[ListFormat["ObjectBindingPatternElements"] = 262576] = "ObjectBindingPatternElements";
+        ListFormat[ListFormat["ArrayBindingPatternElements"] = 262448] = "ArrayBindingPatternElements";
+        ListFormat[ListFormat["ObjectLiteralExpressionProperties"] = 263122] = "ObjectLiteralExpressionProperties";
+        ListFormat[ListFormat["ArrayLiteralExpressionElements"] = 4466] = "ArrayLiteralExpressionElements";
+        ListFormat[ListFormat["CommaListElements"] = 272] = "CommaListElements";
+        ListFormat[ListFormat["CallExpressionArguments"] = 1296] = "CallExpressionArguments";
+        ListFormat[ListFormat["NewExpressionArguments"] = 9488] = "NewExpressionArguments";
+        ListFormat[ListFormat["TemplateExpressionSpans"] = 131072] = "TemplateExpressionSpans";
+        ListFormat[ListFormat["SingleLineBlockStatements"] = 384] = "SingleLineBlockStatements";
+        ListFormat[ListFormat["MultiLineBlockStatements"] = 65] = "MultiLineBlockStatements";
+        ListFormat[ListFormat["VariableDeclarationList"] = 272] = "VariableDeclarationList";
+        ListFormat[ListFormat["SingleLineFunctionBodyStatements"] = 384] = "SingleLineFunctionBodyStatements";
+        ListFormat[ListFormat["MultiLineFunctionBodyStatements"] = 1] = "MultiLineFunctionBodyStatements";
+        ListFormat[ListFormat["ClassHeritageClauses"] = 0] = "ClassHeritageClauses";
+        ListFormat[ListFormat["ClassMembers"] = 65] = "ClassMembers";
+        ListFormat[ListFormat["InterfaceMembers"] = 65] = "InterfaceMembers";
+        ListFormat[ListFormat["EnumMembers"] = 81] = "EnumMembers";
+        ListFormat[ListFormat["CaseBlockClauses"] = 65] = "CaseBlockClauses";
+        ListFormat[ListFormat["NamedImportsOrExportsElements"] = 262576] = "NamedImportsOrExportsElements";
+        ListFormat[ListFormat["JsxElementOrFragmentChildren"] = 131072] = "JsxElementOrFragmentChildren";
+        ListFormat[ListFormat["JsxElementAttributes"] = 131328] = "JsxElementAttributes";
+        ListFormat[ListFormat["CaseOrDefaultClauseStatements"] = 81985] = "CaseOrDefaultClauseStatements";
+        ListFormat[ListFormat["HeritageClauseTypes"] = 272] = "HeritageClauseTypes";
+        ListFormat[ListFormat["SourceFileStatements"] = 65537] = "SourceFileStatements";
+        ListFormat[ListFormat["Decorators"] = 24577] = "Decorators";
+        ListFormat[ListFormat["TypeArguments"] = 26896] = "TypeArguments";
+        ListFormat[ListFormat["TypeParameters"] = 26896] = "TypeParameters";
+        ListFormat[ListFormat["Parameters"] = 1296] = "Parameters";
+        ListFormat[ListFormat["IndexSignatureParameters"] = 4432] = "IndexSignatureParameters";
+    })(ListFormat = ts.ListFormat || (ts.ListFormat = {}));
+    /* @internal */
+    var PragmaKindFlags;
+    (function (PragmaKindFlags) {
+        PragmaKindFlags[PragmaKindFlags["None"] = 0] = "None";
+        /**
+         * Triple slash comment of the form
+         * /// <pragma-name argname="value" />
+         */
+        PragmaKindFlags[PragmaKindFlags["TripleSlashXML"] = 1] = "TripleSlashXML";
+        /**
+         * Single line comment of the form
+         * // @pragma-name argval1 argval2
+         * or
+         * /// @pragma-name argval1 argval2
+         */
+        PragmaKindFlags[PragmaKindFlags["SingleLine"] = 2] = "SingleLine";
+        /**
+         * Multiline non-jsdoc pragma of the form
+         * /* @pragma-name argval1 argval2 * /
+         */
+        PragmaKindFlags[PragmaKindFlags["MultiLine"] = 4] = "MultiLine";
+        PragmaKindFlags[PragmaKindFlags["All"] = 7] = "All";
+        PragmaKindFlags[PragmaKindFlags["Default"] = 7] = "Default";
+    })(PragmaKindFlags = ts.PragmaKindFlags || (ts.PragmaKindFlags = {}));
+    /**
+     * This function only exists to cause exact types to be inferred for all the literals within `commentPragmas`
+     */
+    /* @internal */
+    function _contextuallyTypePragmas(args) {
+        return args;
+    }
+    // While not strictly a type, this is here because `PragmaMap` needs to be here to be used with `SourceFile`, and we don't
+    //  fancy effectively defining it twice, once in value-space and once in type-space
+    /* @internal */
+    ts.commentPragmas = _contextuallyTypePragmas({
+        "reference": {
+            args: [
+                { name: "types", optional: true, captureSpan: true },
+                { name: "lib", optional: true, captureSpan: true },
+                { name: "path", optional: true, captureSpan: true },
+                { name: "no-default-lib", optional: true }
+            ],
+            kind: 1 /* TripleSlashXML */
+        },
+        "amd-dependency": {
+            args: [{ name: "path" }, { name: "name", optional: true }],
+            kind: 1 /* TripleSlashXML */
+        },
+        "amd-module": {
+            args: [{ name: "name" }],
+            kind: 1 /* TripleSlashXML */
+        },
+        "ts-check": {
+            kind: 2 /* SingleLine */
+        },
+        "ts-nocheck": {
+            kind: 2 /* SingleLine */
+        },
+        "jsx": {
+            args: [{ name: "factory" }],
+            kind: 4 /* MultiLine */
+        },
+    });
+})(ts || (ts = {}));
+var ts;
+(function (ts) {
+    /**
+     * Set a high stack trace limit to provide more information in case of an error.
+     * Called for command-line and server use cases.
+     * Not called if TypeScript is used as a library.
+     */
+    /* @internal */
     function setStackTraceLimit() {
-        if (Error.stackTraceLimit < 100) {
+        if (Error.stackTraceLimit < 100) { // Also tests that we won't set the property if it doesn't exist.
             Error.stackTraceLimit = 100;
         }
     }
@@ -4103,6 +3533,7 @@ var ts;
         FileWatcherEventKind[FileWatcherEventKind["Changed"] = 1] = "Changed";
         FileWatcherEventKind[FileWatcherEventKind["Deleted"] = 2] = "Deleted";
     })(FileWatcherEventKind = ts.FileWatcherEventKind || (ts.FileWatcherEventKind = {}));
+    /* @internal */
     var PollingInterval;
     (function (PollingInterval) {
         PollingInterval[PollingInterval["High"] = 2000] = "High";
@@ -4118,11 +3549,13 @@ var ts;
         return pollingIntervalsForPriority[watchPriority];
     }
     var pollingIntervalsForPriority = getPriorityValues(250);
+    /* @internal */
     function watchFileUsingPriorityPollingInterval(host, fileName, callback, watchPriority) {
         return host.watchFile(fileName, callback, pollingInterval(watchPriority));
     }
     ts.watchFileUsingPriorityPollingInterval = watchFileUsingPriorityPollingInterval;
-    ts.missingFileModifiedTime = new Date(0);
+    /* @internal */
+    ts.missingFileModifiedTime = new Date(0); // Any subsequent modification will occur after this time
     function createPollingIntervalBasedLevels(levels) {
         var _a;
         return _a = {},
@@ -4133,7 +3566,9 @@ var ts;
     }
     var defaultChunkLevels = { Low: 32, Medium: 64, High: 256 };
     var pollingChunkSize = createPollingIntervalBasedLevels(defaultChunkLevels);
+    /* @internal */
     ts.unchangedPollThresholds = createPollingIntervalBasedLevels(defaultChunkLevels);
+    /* @internal */
     function setCustomPollingValues(system) {
         if (!system.getEnvironmentVariable) {
             return;
@@ -4177,6 +3612,7 @@ var ts;
         }
     }
     ts.setCustomPollingValues = setCustomPollingValues;
+    /* @internal */
     function createDynamicPriorityPollingWatchFile(host) {
         var watchedFiles = [];
         var changedFilesInLastPoll = [];
@@ -4196,7 +3632,9 @@ var ts;
             return {
                 close: function () {
                     file.isClosed = true;
+                    // Remove from watchedFiles
                     ts.unorderedRemoveItem(watchedFiles, file);
+                    // Do not update polling interval queue since that will happen as part of polling
                 }
             };
         }
@@ -4209,6 +3647,7 @@ var ts;
         }
         function pollPollingIntervalQueue(queue) {
             queue.pollIndex = pollQueue(queue, queue.pollingInterval, queue.pollIndex, pollingChunkSize[queue.pollingInterval]);
+            // Set the next polling index and timeout
             if (queue.length) {
                 scheduleNextPoll(queue.pollingInterval);
             }
@@ -4218,13 +3657,18 @@ var ts;
             }
         }
         function pollLowPollingIntervalQueue(queue) {
-            pollQueue(changedFilesInLastPoll, PollingInterval.Low, 0, changedFilesInLastPoll.length);
+            // Always poll complete list of changedFilesInLastPoll
+            pollQueue(changedFilesInLastPoll, PollingInterval.Low, /*pollIndex*/ 0, changedFilesInLastPoll.length);
+            // Finally do the actual polling of the queue
             pollPollingIntervalQueue(queue);
+            // Schedule poll if there are files in changedFilesInLastPoll but no files in the actual queue
+            // as pollPollingIntervalQueue wont schedule for next poll
             if (!queue.pollScheduled && changedFilesInLastPoll.length) {
                 scheduleNextPoll(PollingInterval.Low);
             }
         }
         function pollQueue(queue, pollingInterval, pollIndex, chunkSize) {
+            // Max visit would be all elements of the queue
             var needsVisit = queue.length;
             var definedValueCopyToIndex = pollIndex;
             for (var polled = 0; polled < chunkSize && needsVisit > 0; nextPollIndex(), needsVisit--) {
@@ -4239,10 +3683,12 @@ var ts;
                 polled++;
                 var fileChanged = onWatchedFileStat(watchedFile, getModifiedTime(watchedFile.fileName));
                 if (watchedFile.isClosed) {
+                    // Closed watcher as part of callback
                     queue[pollIndex] = undefined;
                 }
                 else if (fileChanged) {
                     watchedFile.unchangedPolls = 0;
+                    // Changed files go to changedFilesInLastPoll queue
                     if (queue !== changedFilesInLastPoll) {
                         queue[pollIndex] = undefined;
                         addChangedFileToLowPollingIntervalQueue(watchedFile);
@@ -4252,6 +3698,7 @@ var ts;
                     watchedFile.unchangedPolls++;
                 }
                 else if (queue === changedFilesInLastPoll) {
+                    // Restart unchangedPollCount for unchanged file and move to low polling interval queue
                     watchedFile.unchangedPolls = 1;
                     queue[pollIndex] = undefined;
                     addToPollingIntervalQueue(watchedFile, PollingInterval.Low);
@@ -4262,6 +3709,7 @@ var ts;
                     addToPollingIntervalQueue(watchedFile, pollingInterval === PollingInterval.Low ? PollingInterval.Medium : PollingInterval.High);
                 }
                 if (queue[pollIndex]) {
+                    // Copy this file to the non hole location
                     if (definedValueCopyToIndex < pollIndex) {
                         queue[definedValueCopyToIndex] = watchedFile;
                         queue[pollIndex] = undefined;
@@ -4269,11 +3717,13 @@ var ts;
                     definedValueCopyToIndex++;
                 }
             }
+            // Return next poll index
             return pollIndex;
             function nextPollIndex() {
                 pollIndex++;
                 if (pollIndex === queue.length) {
                     if (definedValueCopyToIndex < pollIndex) {
+                        // There are holes from nextDefinedValueIndex to end of queue, change queue size
                         queue.length = definedValueCopyToIndex;
                     }
                     pollIndex = 0;
@@ -4312,6 +3762,10 @@ var ts;
         }
     }
     ts.createDynamicPriorityPollingWatchFile = createDynamicPriorityPollingWatchFile;
+    /**
+     * Returns true if file status changed
+     */
+    /*@internal*/
     function onWatchedFileStat(watchedFile, modifiedTime) {
         var oldTime = watchedFile.mtime.getTime();
         var newTime = modifiedTime.getTime();
@@ -4328,11 +3782,22 @@ var ts;
         return false;
     }
     ts.onWatchedFileStat = onWatchedFileStat;
+    /**
+     * Watch the directory recursively using host provided method to watch child directories
+     * that means if this is recursive watcher, watch the children directories as well
+     * (eg on OS that dont support recursive watch using fs.watch use fs.watchFile)
+     */
+    /*@internal*/
     function createRecursiveDirectoryWatcher(host) {
         return createDirectoryWatcher;
+        /**
+         * Create the directory watcher for the dirPath.
+         */
         function createDirectoryWatcher(dirName, callback) {
             var watcher = host.watchDirectory(dirName, function (fileName) {
+                // Call the actual callback
                 callback(fileName);
+                // Iterate through existing children and update the watches if needed
                 updateChildWatches(result, callback);
             });
             var result = {
@@ -4348,21 +3813,33 @@ var ts;
             return result;
         }
         function updateChildWatches(watcher, callback) {
+            // Iterate through existing children and update the watches if needed
             if (watcher) {
                 watcher.childWatches = watchChildDirectories(watcher.dirName, watcher.childWatches, callback);
             }
         }
+        /**
+         * Watch the directories in the parentDir
+         */
         function watchChildDirectories(parentDir, existingChildWatches, callback) {
             var newChildWatches;
             ts.enumerateInsertsAndDeletes(host.directoryExists(parentDir) ? ts.mapDefined(host.getAccessibleSortedChildDirectories(parentDir), function (child) {
                 var childFullName = ts.getNormalizedAbsolutePath(child, parentDir);
-                return host.filePathComparer(childFullName, host.realpath(childFullName)) === 0 ? childFullName : undefined;
+                // Filter our the symbolic link directories since those arent included in recursive watch
+                // which is same behaviour when recursive: true is passed to fs.watch
+                return host.filePathComparer(childFullName, host.realpath(childFullName)) === 0 /* EqualTo */ ? childFullName : undefined;
             }) : ts.emptyArray, existingChildWatches, function (child, childWatcher) { return host.filePathComparer(child, childWatcher.dirName); }, createAndAddChildDirectoryWatcher, ts.closeFileWatcher, addChildDirectoryWatcher);
             return newChildWatches || ts.emptyArray;
+            /**
+             * Create new childDirectoryWatcher and add it to the new ChildDirectoryWatcher list
+             */
             function createAndAddChildDirectoryWatcher(childName) {
                 var result = createDirectoryWatcher(childName, callback);
                 addChildDirectoryWatcher(result);
             }
+            /**
+             * Add child directory watcher to the new ChildDirectoryWatcher list
+             */
             function addChildDirectoryWatcher(childWatcher) {
                 (newChildWatches || (newChildWatches = [])).push(childWatcher);
             }
@@ -4384,12 +3861,17 @@ var ts;
         return parseInt(version.substring(1, dot));
     }
     ts.getNodeMajorVersion = getNodeMajorVersion;
+    // TODO: this is used as if it's certainly defined in many places.
     ts.sys = (function () {
+        // NodeJS detects "\uFEFF" at the start of the string and *replaces* it with the actual
+        // byte order mark from the specified encoding. Using any other byte order mark does
+        // not actually work.
         var byteOrderMarkIndicator = "\uFEFF";
         function getNodeSystem() {
             var _fs = require("fs");
             var _path = require("path");
             var _os = require("os");
+            // crypto can be absent on reduced node installations
             var _crypto;
             try {
                 _crypto = require("crypto");
@@ -4445,6 +3927,8 @@ var ts;
                 },
                 readDirectory: readDirectory,
                 getModifiedTime: getModifiedTime,
+                setModifiedTime: setModifiedTime,
+                deleteFile: deleteFile,
                 createHash: _crypto ? createMD5HashUsingNativeCrypto : generateDjb2Hash,
                 createSHA256Hash: _crypto ? createSHA256Hash : undefined,
                 getMemoryUsage: function () {
@@ -4460,7 +3944,7 @@ var ts;
                             return stat.size;
                         }
                     }
-                    catch (_a) { }
+                    catch ( /*ignore*/_a) { /*ignore*/ }
                     return 0;
                 },
                 exit: function (exitCode) {
@@ -4473,6 +3957,7 @@ var ts;
                         require("source-map-support").install();
                     }
                     catch (_a) {
+                        // Could not enable source maps.
                     }
                 },
                 setTimeout: setTimeout,
@@ -4498,11 +3983,14 @@ var ts;
             };
             return nodeSystem;
             function isFileSystemCaseSensitive() {
+                // win32\win64 are case insensitive platforms
                 if (platform === "win32" || platform === "win64") {
                     return false;
                 }
+                // If this file exists under a different case, we must be case-insensitve.
                 return !fileExists(swapCase(__filename));
             }
+            /** Convert all lowercase chars to uppercase, and vice-versa */
             function swapCase(s) {
                 return s.replace(/\w/g, function (ch) {
                     var up = ch.toUpperCase();
@@ -4512,22 +4000,30 @@ var ts;
             function getWatchFile() {
                 switch (tscWatchFile) {
                     case "PriorityPollingInterval":
+                        // Use polling interval based on priority when create watch using host.watchFile
                         return fsWatchFile;
                     case "DynamicPriorityPolling":
+                        // Use polling interval but change the interval depending on file changes and their default polling interval
                         return createDynamicPriorityPollingWatchFile({ getModifiedTime: getModifiedTime, setTimeout: setTimeout });
                     case "UseFsEvents":
+                        // Use notifications from FS to watch with falling back to fs.watchFile
                         return watchFileUsingFsWatch;
                     case "UseFsEventsWithFallbackDynamicPolling":
+                        // Use notifications from FS to watch with falling back to dynamic watch file
                         dynamicPollingWatchFile = createDynamicPriorityPollingWatchFile({ getModifiedTime: getModifiedTime, setTimeout: setTimeout });
                         return createWatchFileUsingDynamicWatchFile(dynamicPollingWatchFile);
                     case "UseFsEventsOnParentDirectory":
+                        // Use notifications from FS to watch with falling back to fs.watchFile
                         return createNonPollingWatchFile();
                 }
                 return useNonPollingWatchers ?
                     createNonPollingWatchFile() :
+                    // Default to do not use polling interval as it is before this experiment branch
                     function (fileName, callback) { return fsWatchFile(fileName, callback); };
             }
             function getWatchDirectory() {
+                // Node 4.0 `fs.watch` function supports the "recursive" option on both OSX and Windows
+                // (ref: https://github.com/nodejs/node/pull/2649 and https://github.com/Microsoft/TypeScript/issues/4643)
                 var fsSupportsRecursive = isNode4OrLater && (process.platform === "win32" || process.platform === "darwin");
                 if (fsSupportsRecursive) {
                     return watchDirectoryUsingFsWatch;
@@ -4549,10 +4045,11 @@ var ts;
                         return watchDirectoryRecursively(directoryName, callback);
                     }
                     watchDirectory(directoryName, callback);
-                    return undefined;
+                    return undefined; // TODO: GH#18217
                 };
             }
             function createNonPollingWatchFile() {
+                // One file can have multiple watchers
                 var fileWatcherCallbacks = ts.createMultiMap();
                 var dirWatchers = ts.createMap();
                 var toCanonicalName = ts.createGetCanonicalFileName(useCaseSensitiveFileNames);
@@ -4578,9 +4075,11 @@ var ts;
                 }
                 function createDirectoryWatcher(dirName, dirPath) {
                     var watcher = fsWatchDirectory(dirName, function (_eventName, relativeFileName) {
+                        // When files are deleted from disk, the triggered "rename" event would have a relativefileName of "undefined"
                         var fileName = !ts.isString(relativeFileName)
-                            ? undefined
+                            ? undefined // TODO: GH#18217
                             : ts.getNormalizedAbsolutePath(relativeFileName, dirName);
+                        // Some applications save a working file via rename operations
                         var callbacks = fileWatcherCallbacks.get(toCanonicalName(fileName));
                         if (callbacks) {
                             for (var _i = 0, callbacks_1 = callbacks; _i < callbacks_1.length; _i++) {
@@ -4601,9 +4100,12 @@ var ts;
                     close: function () { return _fs.unwatchFile(fileName, fileChanged); }
                 };
                 function fileChanged(curr, prev) {
+                    // previous event kind check is to ensure we recongnize the file as previously also missing when it is restored or renamed twice (that is it disappears and reappears)
+                    // In such case, prevTime returned is same as prev time of event when file was deleted as per node documentation
                     var isPreviouslyDeleted = +prev.mtime === 0 || eventKind === FileWatcherEventKind.Deleted;
                     if (+curr.mtime === 0) {
                         if (isPreviouslyDeleted) {
+                            // Already deleted file, no need to callback again
                             return;
                         }
                         eventKind = FileWatcherEventKind.Deleted;
@@ -4611,10 +4113,12 @@ var ts;
                     else if (isPreviouslyDeleted) {
                         eventKind = FileWatcherEventKind.Created;
                     }
+                    // If there is no change in modified time, ignore the event
                     else if (+curr.mtime === +prev.mtime) {
                         return;
                     }
                     else {
+                        // File changed
                         eventKind = FileWatcherEventKind.Changed;
                     }
                     callback(fileName, eventKind);
@@ -4629,36 +4133,55 @@ var ts;
                         callback(fileName, fileExists(fileName) ? FileWatcherEventKind.Created : FileWatcherEventKind.Deleted);
                     }
                     else {
+                        // Change
                         callback(fileName, FileWatcherEventKind.Changed);
                     }
                 };
             }
             function createFsWatchCallbackForDirectoryWatcherCallback(directoryName, callback) {
                 return function (eventName, relativeFileName) {
+                    // In watchDirectory we only care about adding and removing files (when event name is
+                    // "rename"); changes made within files are handled by corresponding fileWatchers (when
+                    // event name is "change")
                     if (eventName === "rename") {
+                        // When deleting a file, the passed baseFileName is null
                         callback(!relativeFileName ? directoryName : ts.normalizePath(ts.combinePaths(directoryName, relativeFileName)));
                     }
                 };
             }
             function fsWatch(fileOrDirectory, entryKind, callback, recursive, fallbackPollingWatchFile, pollingInterval) {
                 var options;
+                /** Watcher for the file system entry depending on whether it is missing or present */
                 var watcher = !fileSystemEntryExists(fileOrDirectory, entryKind) ?
                     watchMissingFileSystemEntry() :
                     watchPresentFileSystemEntry();
                 return {
                     close: function () {
+                        // Close the watcher (either existing file system entry watcher or missing file system entry watcher)
                         watcher.close();
                         watcher = undefined;
                     }
                 };
+                /**
+                 * Invoke the callback with rename and update the watcher if not closed
+                 * @param createWatcher
+                 */
                 function invokeCallbackAndUpdateWatcher(createWatcher) {
+                    // Call the callback for current directory
                     callback("rename", "");
+                    // If watcher is not closed, update it
                     if (watcher) {
                         watcher.close();
                         watcher = createWatcher();
                     }
                 }
+                /**
+                 * Watch the file or directory that is currently present
+                 * and when the watched file or directory is deleted, switch to missing file system entry watcher
+                 */
                 function watchPresentFileSystemEntry() {
+                    // Node 4.0 `fs.watch` function supports the "recursive" option on both OSX and Windows
+                    // (ref: https://github.com/nodejs/node/pull/2649 and https://github.com/Microsoft/TypeScript/issues/4643)
                     if (options === undefined) {
                         if (isNode4OrLater && (process.platform === "win32" || process.platform === "darwin")) {
                             options = { persistent: true, recursive: !!recursive };
@@ -4669,32 +4192,47 @@ var ts;
                     }
                     try {
                         var presentWatcher = _fs.watch(fileOrDirectory, options, callback);
+                        // Watch the missing file or directory or error
                         presentWatcher.on("error", function () { return invokeCallbackAndUpdateWatcher(watchMissingFileSystemEntry); });
                         return presentWatcher;
                     }
                     catch (e) {
+                        // Catch the exception and use polling instead
+                        // Eg. on linux the number of watches are limited and one could easily exhaust watches and the exception ENOSPC is thrown when creating watcher at that point
+                        // so instead of throwing error, use fs.watchFile
                         return watchPresentFileSystemEntryWithFsWatchFile();
                     }
                 }
+                /**
+                 * Watch the file or directory using fs.watchFile since fs.watch threw exception
+                 * Eg. on linux the number of watches are limited and one could easily exhaust watches and the exception ENOSPC is thrown when creating watcher at that point
+                 */
                 function watchPresentFileSystemEntryWithFsWatchFile() {
                     return fallbackPollingWatchFile(fileOrDirectory, createFileWatcherCallback(callback), pollingInterval);
                 }
+                /**
+                 * Watch the file or directory that is missing
+                 * and switch to existing file or directory when the missing filesystem entry is created
+                 */
                 function watchMissingFileSystemEntry() {
                     return fallbackPollingWatchFile(fileOrDirectory, function (_fileName, eventKind) {
                         if (eventKind === FileWatcherEventKind.Created && fileSystemEntryExists(fileOrDirectory, entryKind)) {
+                            // Call the callback for current file or directory
+                            // For now it could be callback for the inner directory creation,
+                            // but just return current directory, better than current no-op
                             invokeCallbackAndUpdateWatcher(watchPresentFileSystemEntry);
                         }
                     }, pollingInterval);
                 }
             }
             function watchFileUsingFsWatch(fileName, callback, pollingInterval) {
-                return fsWatch(fileName, 0, createFsWatchCallbackForFileWatcherCallback(fileName, callback), false, fsWatchFile, pollingInterval);
+                return fsWatch(fileName, 0 /* File */, createFsWatchCallbackForFileWatcherCallback(fileName, callback), /*recursive*/ false, fsWatchFile, pollingInterval);
             }
             function createWatchFileUsingDynamicWatchFile(watchFile) {
-                return function (fileName, callback, pollingInterval) { return fsWatch(fileName, 0, createFsWatchCallbackForFileWatcherCallback(fileName, callback), false, watchFile, pollingInterval); };
+                return function (fileName, callback, pollingInterval) { return fsWatch(fileName, 0 /* File */, createFsWatchCallbackForFileWatcherCallback(fileName, callback), /*recursive*/ false, watchFile, pollingInterval); };
             }
             function fsWatchDirectory(directoryName, callback, recursive) {
-                return fsWatch(directoryName, 1, callback, !!recursive, fsWatchFile);
+                return fsWatch(directoryName, 1 /* Directory */, callback, !!recursive, fsWatchFile);
             }
             function watchDirectoryUsingFsWatch(directoryName, callback, recursive) {
                 return fsWatchDirectory(directoryName, createFsWatchCallbackForDirectoryWatcherCallback(directoryName, callback), recursive);
@@ -4709,7 +4247,9 @@ var ts;
                 var buffer = _fs.readFileSync(fileName);
                 var len = buffer.length;
                 if (len >= 2 && buffer[0] === 0xFE && buffer[1] === 0xFF) {
-                    len &= ~1;
+                    // Big endian UTF-16 byte order mark detected. Since big endian is not supported by node.js,
+                    // flip all byte pairs and treat as little endian.
+                    len &= ~1; // Round down to a multiple of 2
                     for (var i = 0; i < len; i += 2) {
                         var temp = buffer[i];
                         buffer[i] = buffer[i + 1];
@@ -4718,21 +4258,25 @@ var ts;
                     return buffer.toString("utf16le", 2);
                 }
                 if (len >= 2 && buffer[0] === 0xFF && buffer[1] === 0xFE) {
+                    // Little endian UTF-16 byte order mark detected
                     return buffer.toString("utf16le", 2);
                 }
                 if (len >= 3 && buffer[0] === 0xEF && buffer[1] === 0xBB && buffer[2] === 0xBF) {
+                    // UTF-8 byte order mark detected
                     return buffer.toString("utf8", 3);
                 }
+                // Default is UTF-8 with no byte order mark
                 return buffer.toString("utf8");
             }
             function writeFile(fileName, data, writeByteOrderMark) {
+                // If a BOM is required, emit one
                 if (writeByteOrderMark) {
                     data = byteOrderMarkIndicator + data;
                 }
                 var fd;
                 try {
                     fd = _fs.openSync(fileName, "w");
-                    _fs.writeSync(fd, data, undefined, "utf8");
+                    _fs.writeSync(fd, data, /*position*/ undefined, "utf8");
                 }
                 finally {
                     if (fd !== undefined) {
@@ -4747,6 +4291,8 @@ var ts;
                     var directories = [];
                     for (var _i = 0, entries_1 = entries; _i < entries_1.length; _i++) {
                         var entry = entries_1[_i];
+                        // This is necessary because on some file system node fails to exclude
+                        // "." and "..". See https://github.com/nodejs/node/issues/4002
                         if (entry === "." || entry === "..") {
                             continue;
                         }
@@ -4778,8 +4324,8 @@ var ts;
                 try {
                     var stat = _fs.statSync(path);
                     switch (entryKind) {
-                        case 0: return stat.isFile();
-                        case 1: return stat.isDirectory();
+                        case 0 /* File */: return stat.isFile();
+                        case 1 /* Directory */: return stat.isDirectory();
                         default: return false;
                     }
                 }
@@ -4788,13 +4334,13 @@ var ts;
                 }
             }
             function fileExists(path) {
-                return fileSystemEntryExists(path, 0);
+                return fileSystemEntryExists(path, 0 /* File */);
             }
             function directoryExists(path) {
-                return fileSystemEntryExists(path, 1);
+                return fileSystemEntryExists(path, 1 /* Directory */);
             }
             function getDirectories(path) {
-                return ts.filter(_fs.readdirSync(path), function (dir) { return fileSystemEntryExists(ts.combinePaths(path, dir), 1); });
+                return ts.filter(_fs.readdirSync(path), function (dir) { return fileSystemEntryExists(ts.combinePaths(path, dir), 1 /* Directory */); });
             }
             function realpath(path) {
                 try {
@@ -4812,6 +4358,26 @@ var ts;
                     return undefined;
                 }
             }
+            function setModifiedTime(path, time) {
+                try {
+                    _fs.utimesSync(path, time, time);
+                }
+                catch (e) {
+                    return;
+                }
+            }
+            function deleteFile(path) {
+                try {
+                    return _fs.unlinkSync(path);
+                }
+                catch (e) {
+                    return;
+                }
+            }
+            /**
+             * djb2 hashing algorithm
+             * http://www.cse.yorku.ca/~oz/hash.html
+             */
             function generateDjb2Hash(data) {
                 var chars = data.split("").map(function (str) { return str.charCodeAt(0); });
                 return "" + chars.reduce(function (prev, curr) { return ((prev << 5) + prev) + curr; }, 5381);
@@ -4835,9 +4401,11 @@ var ts;
                 useCaseSensitiveFileNames: !!ChakraHost.useCaseSensitiveFileNames,
                 write: ChakraHost.echo,
                 readFile: function (path, _encoding) {
+                    // encoding is automatically handled by the implementation in ChakraHost
                     return ChakraHost.readFile(path);
                 },
                 writeFile: function (path, data, writeByteOrderMark) {
+                    // If a BOM is required, emit one
                     if (writeByteOrderMark) {
                         data = byteOrderMarkIndicator + data;
                     }
@@ -4874,9 +4442,12 @@ var ts;
             sys = getChakraSystem();
         }
         else if (typeof process !== "undefined" && process.nextTick && !process.browser && typeof require !== "undefined") {
+            // process and process.nextTick checks if current environment is node-like
+            // process.browser check excludes webpack and browserify
             sys = getNodeSystem();
         }
         if (sys) {
+            // patch writefile to create folder before writing the file
             var originalWriteFile_1 = sys.writeFile;
             sys.writeFile = function (path, data, writeBom) {
                 var directoryPath = ts.getDirectoryPath(ts.normalizeSlashes(path));
@@ -4891,18 +4462,22 @@ var ts;
     if (ts.sys && ts.sys.getEnvironmentVariable) {
         setCustomPollingValues(ts.sys);
         ts.Debug.currentAssertionLevel = /^development$/i.test(ts.sys.getEnvironmentVariable("NODE_ENV"))
-            ? 1
-            : 0;
+            ? 1 /* Normal */
+            : 0 /* None */;
     }
     if (ts.sys && ts.sys.debugMode) {
         ts.Debug.isDebugging = true;
     }
 })(ts || (ts = {}));
+// <auto-generated />
+// generated from './diagnosticInformationMap.generated.ts' by 'src\parser'
+/* @internal */
 var ts;
 (function (ts) {
     function diag(code, category, key, message, reportsUnnecessary) {
         return { code: code, category: category, key: key, message: message, reportsUnnecessary: reportsUnnecessary };
     }
+    // tslint:disable-next-line variable-name
     ts.Diagnostics = {
         Unterminated_string_literal: diag(1002, ts.DiagnosticCategory.Error, "Unterminated_string_literal_1002", "Unterminated string literal."),
         Identifier_expected: diag(1003, ts.DiagnosticCategory.Error, "Identifier_expected_1003", "Identifier expected."),
@@ -5465,7 +5040,7 @@ var ts;
         _0_is_a_primitive_but_1_is_a_wrapper_object_Prefer_using_0_when_possible: diag(2692, ts.DiagnosticCategory.Error, "_0_is_a_primitive_but_1_is_a_wrapper_object_Prefer_using_0_when_possible_2692", "'{0}' is a primitive, but '{1}' is a wrapper object. Prefer using '{0}' when possible."),
         _0_only_refers_to_a_type_but_is_being_used_as_a_value_here: diag(2693, ts.DiagnosticCategory.Error, "_0_only_refers_to_a_type_but_is_being_used_as_a_value_here_2693", "'{0}' only refers to a type, but is being used as a value here."),
         Namespace_0_has_no_exported_member_1: diag(2694, ts.DiagnosticCategory.Error, "Namespace_0_has_no_exported_member_1_2694", "Namespace '{0}' has no exported member '{1}'."),
-        Left_side_of_comma_operator_is_unused_and_has_no_side_effects: diag(2695, ts.DiagnosticCategory.Error, "Left_side_of_comma_operator_is_unused_and_has_no_side_effects_2695", "Left side of comma operator is unused and has no side effects.", true),
+        Left_side_of_comma_operator_is_unused_and_has_no_side_effects: diag(2695, ts.DiagnosticCategory.Error, "Left_side_of_comma_operator_is_unused_and_has_no_side_effects_2695", "Left side of comma operator is unused and has no side effects.", /*reportsUnnecessary*/ true),
         The_Object_type_is_assignable_to_very_few_other_types_Did_you_mean_to_use_the_any_type_instead: diag(2696, ts.DiagnosticCategory.Error, "The_Object_type_is_assignable_to_very_few_other_types_Did_you_mean_to_use_the_any_type_instead_2696", "The 'Object' type is assignable to very few other types. Did you mean to use the 'any' type instead?"),
         An_async_function_or_method_must_return_a_Promise_Make_sure_you_have_a_declaration_for_Promise_or_include_ES2015_in_your_lib_option: diag(2697, ts.DiagnosticCategory.Error, "An_async_function_or_method_must_return_a_Promise_Make_sure_you_have_a_declaration_for_Promise_or_in_2697", "An async function or method must return a 'Promise'. Make sure you have a declaration for 'Promise' or include 'ES2015' in your `--lib` option."),
         Spread_types_may_only_be_created_from_object_types: diag(2698, ts.DiagnosticCategory.Error, "Spread_types_may_only_be_created_from_object_types_2698", "Spread types may only be created from object types."),
@@ -5496,6 +5071,8 @@ var ts;
         Cannot_invoke_an_object_which_is_possibly_null_or_undefined: diag(2723, ts.DiagnosticCategory.Error, "Cannot_invoke_an_object_which_is_possibly_null_or_undefined_2723", "Cannot invoke an object which is possibly 'null' or 'undefined'."),
         Module_0_has_no_exported_member_1_Did_you_mean_2: diag(2724, ts.DiagnosticCategory.Error, "Module_0_has_no_exported_member_1_Did_you_mean_2_2724", "Module '{0}' has no exported member '{1}'. Did you mean '{2}'?"),
         Class_name_cannot_be_Object_when_targeting_ES5_with_module_0: diag(2725, ts.DiagnosticCategory.Error, "Class_name_cannot_be_Object_when_targeting_ES5_with_module_0_2725", "Class name cannot be 'Object' when targeting ES5 with module {0}."),
+        Cannot_find_lib_definition_for_0: diag(2726, ts.DiagnosticCategory.Error, "Cannot_find_lib_definition_for_0_2726", "Cannot find lib definition for '{0}'."),
+        Cannot_find_lib_definition_for_0_Did_you_mean_1: diag(2727, ts.DiagnosticCategory.Error, "Cannot_find_lib_definition_for_0_Did_you_mean_1_2727", "Cannot find lib definition for '{0}'. Did you mean '{1}'?"),
         Import_declaration_0_is_using_private_name_1: diag(4000, ts.DiagnosticCategory.Error, "Import_declaration_0_is_using_private_name_1_4000", "Import declaration '{0}' is using private name '{1}'."),
         Type_parameter_0_of_exported_class_has_or_is_using_private_name_1: diag(4002, ts.DiagnosticCategory.Error, "Type_parameter_0_of_exported_class_has_or_is_using_private_name_1_4002", "Type parameter '{0}' of exported class has or is using private name '{1}'."),
         Type_parameter_0_of_exported_interface_has_or_is_using_private_name_1: diag(4004, ts.DiagnosticCategory.Error, "Type_parameter_0_of_exported_interface_has_or_is_using_private_name_1_4004", "Type parameter '{0}' of exported interface has or is using private name '{1}'."),
@@ -5729,12 +5306,12 @@ var ts;
         Resolving_real_path_for_0_result_1: diag(6130, ts.DiagnosticCategory.Message, "Resolving_real_path_for_0_result_1_6130", "Resolving real path for '{0}', result '{1}'."),
         Cannot_compile_modules_using_option_0_unless_the_module_flag_is_amd_or_system: diag(6131, ts.DiagnosticCategory.Error, "Cannot_compile_modules_using_option_0_unless_the_module_flag_is_amd_or_system_6131", "Cannot compile modules using option '{0}' unless the '--module' flag is 'amd' or 'system'."),
         File_name_0_has_a_1_extension_stripping_it: diag(6132, ts.DiagnosticCategory.Message, "File_name_0_has_a_1_extension_stripping_it_6132", "File name '{0}' has a '{1}' extension - stripping it."),
-        _0_is_declared_but_its_value_is_never_read: diag(6133, ts.DiagnosticCategory.Error, "_0_is_declared_but_its_value_is_never_read_6133", "'{0}' is declared but its value is never read.", true),
+        _0_is_declared_but_its_value_is_never_read: diag(6133, ts.DiagnosticCategory.Error, "_0_is_declared_but_its_value_is_never_read_6133", "'{0}' is declared but its value is never read.", /*reportsUnnecessary*/ true),
         Report_errors_on_unused_locals: diag(6134, ts.DiagnosticCategory.Message, "Report_errors_on_unused_locals_6134", "Report errors on unused locals."),
         Report_errors_on_unused_parameters: diag(6135, ts.DiagnosticCategory.Message, "Report_errors_on_unused_parameters_6135", "Report errors on unused parameters."),
         The_maximum_dependency_depth_to_search_under_node_modules_and_load_JavaScript_files: diag(6136, ts.DiagnosticCategory.Message, "The_maximum_dependency_depth_to_search_under_node_modules_and_load_JavaScript_files_6136", "The maximum dependency depth to search under node_modules and load JavaScript files."),
         Cannot_import_type_declaration_files_Consider_importing_0_instead_of_1: diag(6137, ts.DiagnosticCategory.Error, "Cannot_import_type_declaration_files_Consider_importing_0_instead_of_1_6137", "Cannot import type declaration files. Consider importing '{0}' instead of '{1}'."),
-        Property_0_is_declared_but_its_value_is_never_read: diag(6138, ts.DiagnosticCategory.Error, "Property_0_is_declared_but_its_value_is_never_read_6138", "Property '{0}' is declared but its value is never read.", true),
+        Property_0_is_declared_but_its_value_is_never_read: diag(6138, ts.DiagnosticCategory.Error, "Property_0_is_declared_but_its_value_is_never_read_6138", "Property '{0}' is declared but its value is never read.", /*reportsUnnecessary*/ true),
         Import_emit_helpers_from_tslib: diag(6139, ts.DiagnosticCategory.Message, "Import_emit_helpers_from_tslib_6139", "Import emit helpers from 'tslib'."),
         Auto_discovery_for_typings_is_enabled_in_project_0_Running_extra_resolution_pass_for_module_1_using_cache_location_2: diag(6140, ts.DiagnosticCategory.Error, "Auto_discovery_for_typings_is_enabled_in_project_0_Running_extra_resolution_pass_for_module_1_using__6140", "Auto discovery for typings is enabled in project '{0}'. Running extra resolution pass for module '{1}' using cache location '{2}'."),
         Parse_in_strict_mode_and_emit_use_strict_for_each_source_file: diag(6141, ts.DiagnosticCategory.Message, "Parse_in_strict_mode_and_emit_use_strict_for_each_source_file_6141", "Parse in strict mode and emit \"use strict\" for each source file."),
@@ -5787,14 +5364,14 @@ var ts;
         Multiple_consecutive_numeric_separators_are_not_permitted: diag(6189, ts.DiagnosticCategory.Error, "Multiple_consecutive_numeric_separators_are_not_permitted_6189", "Multiple consecutive numeric separators are not permitted."),
         Found_package_json_at_0_Package_ID_is_1: diag(6190, ts.DiagnosticCategory.Message, "Found_package_json_at_0_Package_ID_is_1_6190", "Found 'package.json' at '{0}'. Package ID is '{1}'."),
         Whether_to_keep_outdated_console_output_in_watch_mode_instead_of_clearing_the_screen: diag(6191, ts.DiagnosticCategory.Message, "Whether_to_keep_outdated_console_output_in_watch_mode_instead_of_clearing_the_screen_6191", "Whether to keep outdated console output in watch mode instead of clearing the screen."),
-        All_imports_in_import_declaration_are_unused: diag(6192, ts.DiagnosticCategory.Error, "All_imports_in_import_declaration_are_unused_6192", "All imports in import declaration are unused.", true),
+        All_imports_in_import_declaration_are_unused: diag(6192, ts.DiagnosticCategory.Error, "All_imports_in_import_declaration_are_unused_6192", "All imports in import declaration are unused.", /*reportsUnnecessary*/ true),
         Found_1_error_Watching_for_file_changes: diag(6193, ts.DiagnosticCategory.Message, "Found_1_error_Watching_for_file_changes_6193", "Found 1 error. Watching for file changes."),
         Found_0_errors_Watching_for_file_changes: diag(6194, ts.DiagnosticCategory.Message, "Found_0_errors_Watching_for_file_changes_6194", "Found {0} errors. Watching for file changes."),
         Resolve_keyof_to_string_valued_property_names_only_no_numbers_or_symbols: diag(6195, ts.DiagnosticCategory.Message, "Resolve_keyof_to_string_valued_property_names_only_no_numbers_or_symbols_6195", "Resolve 'keyof' to string valued property names only (no numbers or symbols)."),
-        _0_is_declared_but_never_used: diag(6196, ts.DiagnosticCategory.Error, "_0_is_declared_but_never_used_6196", "'{0}' is declared but never used.", true),
+        _0_is_declared_but_never_used: diag(6196, ts.DiagnosticCategory.Error, "_0_is_declared_but_never_used_6196", "'{0}' is declared but never used.", /*reportsUnnecessary*/ true),
         Include_modules_imported_with_json_extension: diag(6197, ts.DiagnosticCategory.Message, "Include_modules_imported_with_json_extension_6197", "Include modules imported with '.json' extension"),
-        All_destructured_elements_are_unused: diag(6198, ts.DiagnosticCategory.Error, "All_destructured_elements_are_unused_6198", "All destructured elements are unused.", true),
-        All_variables_are_unused: diag(6199, ts.DiagnosticCategory.Error, "All_variables_are_unused_6199", "All variables are unused.", true),
+        All_destructured_elements_are_unused: diag(6198, ts.DiagnosticCategory.Error, "All_destructured_elements_are_unused_6198", "All destructured elements are unused.", /*reportsUnnecessary*/ true),
+        All_variables_are_unused: diag(6199, ts.DiagnosticCategory.Error, "All_variables_are_unused_6199", "All variables are unused.", /*reportsUnnecessary*/ true),
         Projects_to_reference: diag(6300, ts.DiagnosticCategory.Message, "Projects_to_reference_6300", "Projects to reference"),
         Enable_project_compilation: diag(6302, ts.DiagnosticCategory.Message, "Enable_project_compilation_6302", "Enable project compilation"),
         Project_references_may_not_form_a_circular_graph_Cycle_detected_Colon_0: diag(6202, ts.DiagnosticCategory.Error, "Project_references_may_not_form_a_circular_graph_Cycle_detected_Colon_0_6202", "Project references may not form a circular graph. Cycle detected: {0}"),
@@ -5804,6 +5381,28 @@ var ts;
         File_0_is_not_in_project_file_list_Projects_must_list_all_files_or_use_an_include_pattern: diag(6307, ts.DiagnosticCategory.Error, "File_0_is_not_in_project_file_list_Projects_must_list_all_files_or_use_an_include_pattern_6307", "File '{0}' is not in project file list. Projects must list all files or use an 'include' pattern."),
         Cannot_prepend_project_0_because_it_does_not_have_outFile_set: diag(6308, ts.DiagnosticCategory.Error, "Cannot_prepend_project_0_because_it_does_not_have_outFile_set_6308", "Cannot prepend project '{0}' because it does not have 'outFile' set"),
         Output_file_0_from_project_1_does_not_exist: diag(6309, ts.DiagnosticCategory.Error, "Output_file_0_from_project_1_does_not_exist_6309", "Output file '{0}' from project '{1}' does not exist"),
+        Project_0_is_out_of_date_because_oldest_output_1_is_older_than_newest_input_2: diag(6350, ts.DiagnosticCategory.Message, "Project_0_is_out_of_date_because_oldest_output_1_is_older_than_newest_input_2_6350", "Project '{0}' is out of date because oldest output '{1}' is older than newest input '{2}'"),
+        Project_0_is_up_to_date_because_newest_input_1_is_older_than_oldest_output_2: diag(6351, ts.DiagnosticCategory.Message, "Project_0_is_up_to_date_because_newest_input_1_is_older_than_oldest_output_2_6351", "Project '{0}' is up to date because newest input '{1}' is older than oldest output '{2}'"),
+        Project_0_is_out_of_date_because_output_file_1_does_not_exist: diag(6352, ts.DiagnosticCategory.Message, "Project_0_is_out_of_date_because_output_file_1_does_not_exist_6352", "Project '{0}' is out of date because output file '{1}' does not exist"),
+        Project_0_is_out_of_date_because_its_dependency_1_is_out_of_date: diag(6353, ts.DiagnosticCategory.Message, "Project_0_is_out_of_date_because_its_dependency_1_is_out_of_date_6353", "Project '{0}' is out of date because its dependency '{1}' is out of date"),
+        Project_0_is_up_to_date_with_d_ts_files_from_its_dependencies: diag(6354, ts.DiagnosticCategory.Message, "Project_0_is_up_to_date_with_d_ts_files_from_its_dependencies_6354", "Project '{0}' is up to date with .d.ts files from its dependencies"),
+        Projects_in_this_build_Colon_0: diag(6355, ts.DiagnosticCategory.Message, "Projects_in_this_build_Colon_0_6355", "Projects in this build: {0}"),
+        A_non_dry_build_would_delete_the_following_files_Colon_0: diag(6356, ts.DiagnosticCategory.Message, "A_non_dry_build_would_delete_the_following_files_Colon_0_6356", "A non-dry build would delete the following files: {0}"),
+        A_non_dry_build_would_build_project_0: diag(6357, ts.DiagnosticCategory.Message, "A_non_dry_build_would_build_project_0_6357", "A non-dry build would build project '{0}'"),
+        Building_project_0: diag(6358, ts.DiagnosticCategory.Message, "Building_project_0_6358", "Building project '{0}'..."),
+        Updating_output_timestamps_of_project_0: diag(6359, ts.DiagnosticCategory.Message, "Updating_output_timestamps_of_project_0_6359", "Updating output timestamps of project '{0}'..."),
+        delete_this_Project_0_is_up_to_date_because_it_was_previously_built: diag(6360, ts.DiagnosticCategory.Message, "delete_this_Project_0_is_up_to_date_because_it_was_previously_built_6360", "delete this - Project '{0}' is up to date because it was previously built"),
+        Project_0_is_up_to_date: diag(6361, ts.DiagnosticCategory.Message, "Project_0_is_up_to_date_6361", "Project '{0}' is up to date"),
+        Skipping_build_of_project_0_because_its_dependency_1_has_errors: diag(6362, ts.DiagnosticCategory.Message, "Skipping_build_of_project_0_because_its_dependency_1_has_errors_6362", "Skipping build of project '{0}' because its dependency '{1}' has errors"),
+        Project_0_can_t_be_built_because_its_dependency_1_has_errors: diag(6363, ts.DiagnosticCategory.Message, "Project_0_can_t_be_built_because_its_dependency_1_has_errors_6363", "Project '{0}' can't be built because its dependency '{1}' has errors"),
+        Build_one_or_more_projects_and_their_dependencies_if_out_of_date: diag(6364, ts.DiagnosticCategory.Message, "Build_one_or_more_projects_and_their_dependencies_if_out_of_date_6364", "Build one or more projects and their dependencies, if out of date"),
+        Delete_the_outputs_of_all_projects: diag(6365, ts.DiagnosticCategory.Message, "Delete_the_outputs_of_all_projects_6365", "Delete the outputs of all projects"),
+        Enable_verbose_logging: diag(6366, ts.DiagnosticCategory.Message, "Enable_verbose_logging_6366", "Enable verbose logging"),
+        Show_what_would_be_built_or_deleted_if_specified_with_clean: diag(6367, ts.DiagnosticCategory.Message, "Show_what_would_be_built_or_deleted_if_specified_with_clean_6367", "Show what would be built (or deleted, if specified with '--clean')"),
+        Build_all_projects_including_those_that_appear_to_be_up_to_date: diag(6368, ts.DiagnosticCategory.Message, "Build_all_projects_including_those_that_appear_to_be_up_to_date_6368", "Build all projects, including those that appear to be up to date"),
+        Option_build_must_be_the_first_command_line_argument: diag(6369, ts.DiagnosticCategory.Error, "Option_build_must_be_the_first_command_line_argument_6369", "Option '--build' must be the first command line argument."),
+        Options_0_and_1_cannot_be_combined: diag(6370, ts.DiagnosticCategory.Error, "Options_0_and_1_cannot_be_combined_6370", "Options '{0}' and '{1}' cannot be combined."),
+        Skipping_clean_because_not_all_projects_could_be_located: diag(6371, ts.DiagnosticCategory.Error, "Skipping_clean_because_not_all_projects_could_be_located_6371", "Skipping clean because not all projects could be located"),
         Variable_0_implicitly_has_an_1_type: diag(7005, ts.DiagnosticCategory.Error, "Variable_0_implicitly_has_an_1_type_7005", "Variable '{0}' implicitly has an '{1}' type."),
         Parameter_0_implicitly_has_an_1_type: diag(7006, ts.DiagnosticCategory.Error, "Parameter_0_implicitly_has_an_1_type_7006", "Parameter '{0}' implicitly has an '{1}' type."),
         Member_0_implicitly_has_an_1_type: diag(7008, ts.DiagnosticCategory.Error, "Member_0_implicitly_has_an_1_type_7008", "Member '{0}' implicitly has an '{1}' type."),
@@ -5822,8 +5421,8 @@ var ts;
         Function_implicitly_has_return_type_any_because_it_does_not_have_a_return_type_annotation_and_is_referenced_directly_or_indirectly_in_one_of_its_return_expressions: diag(7024, ts.DiagnosticCategory.Error, "Function_implicitly_has_return_type_any_because_it_does_not_have_a_return_type_annotation_and_is_ref_7024", "Function implicitly has return type 'any' because it does not have a return type annotation and is referenced directly or indirectly in one of its return expressions."),
         Generator_implicitly_has_type_0_because_it_does_not_yield_any_values_Consider_supplying_a_return_type: diag(7025, ts.DiagnosticCategory.Error, "Generator_implicitly_has_type_0_because_it_does_not_yield_any_values_Consider_supplying_a_return_typ_7025", "Generator implicitly has type '{0}' because it does not yield any values. Consider supplying a return type."),
         JSX_element_implicitly_has_type_any_because_no_interface_JSX_0_exists: diag(7026, ts.DiagnosticCategory.Error, "JSX_element_implicitly_has_type_any_because_no_interface_JSX_0_exists_7026", "JSX element implicitly has type 'any' because no interface 'JSX.{0}' exists."),
-        Unreachable_code_detected: diag(7027, ts.DiagnosticCategory.Error, "Unreachable_code_detected_7027", "Unreachable code detected.", true),
-        Unused_label: diag(7028, ts.DiagnosticCategory.Error, "Unused_label_7028", "Unused label.", true),
+        Unreachable_code_detected: diag(7027, ts.DiagnosticCategory.Error, "Unreachable_code_detected_7027", "Unreachable code detected.", /*reportsUnnecessary*/ true),
+        Unused_label: diag(7028, ts.DiagnosticCategory.Error, "Unused_label_7028", "Unused label.", /*reportsUnnecessary*/ true),
         Fallthrough_case_in_switch: diag(7029, ts.DiagnosticCategory.Error, "Fallthrough_case_in_switch_7029", "Fallthrough case in switch."),
         Not_all_code_paths_return_a_value: diag(7030, ts.DiagnosticCategory.Error, "Not_all_code_paths_return_a_value_7030", "Not all code paths return a value."),
         Binding_element_0_implicitly_has_an_1_type: diag(7031, ts.DiagnosticCategory.Error, "Binding_element_0_implicitly_has_an_1_type_7031", "Binding element '{0}' implicitly has an '{1}' type."),
@@ -5980,157 +5579,204 @@ var ts;
 })(ts || (ts = {}));
 var ts;
 (function (ts) {
+    /* @internal */
     function tokenIsIdentifierOrKeyword(token) {
-        return token >= 71;
+        return token >= 71 /* Identifier */;
     }
     ts.tokenIsIdentifierOrKeyword = tokenIsIdentifierOrKeyword;
+    /* @internal */
     function tokenIsIdentifierOrKeywordOrGreaterThan(token) {
-        return token === 29 || tokenIsIdentifierOrKeyword(token);
+        return token === 29 /* GreaterThanToken */ || tokenIsIdentifierOrKeyword(token);
     }
     ts.tokenIsIdentifierOrKeywordOrGreaterThan = tokenIsIdentifierOrKeywordOrGreaterThan;
     var textToToken = ts.createMapFromTemplate({
-        "abstract": 117,
-        "any": 119,
-        "as": 118,
-        "boolean": 122,
-        "break": 72,
-        "case": 73,
-        "catch": 74,
-        "class": 75,
-        "continue": 77,
-        "const": 76,
-        "constructor": 123,
-        "debugger": 78,
-        "declare": 124,
-        "default": 79,
-        "delete": 80,
-        "do": 81,
-        "else": 82,
-        "enum": 83,
-        "export": 84,
-        "extends": 85,
-        "false": 86,
-        "finally": 87,
-        "for": 88,
-        "from": 143,
-        "function": 89,
-        "get": 125,
-        "if": 90,
-        "implements": 108,
-        "import": 91,
-        "in": 92,
-        "infer": 126,
-        "instanceof": 93,
-        "interface": 109,
-        "is": 127,
-        "keyof": 128,
-        "let": 110,
-        "module": 129,
-        "namespace": 130,
-        "never": 131,
-        "new": 94,
-        "null": 95,
-        "number": 134,
-        "object": 135,
-        "package": 111,
-        "private": 112,
-        "protected": 113,
-        "public": 114,
-        "readonly": 132,
-        "require": 133,
-        "global": 144,
-        "return": 96,
-        "set": 136,
-        "static": 115,
-        "string": 137,
-        "super": 97,
-        "switch": 98,
-        "symbol": 138,
-        "this": 99,
-        "throw": 100,
-        "true": 101,
-        "try": 102,
-        "type": 139,
-        "typeof": 103,
-        "undefined": 140,
-        "unique": 141,
-        "unknown": 142,
-        "var": 104,
-        "void": 105,
-        "while": 106,
-        "with": 107,
-        "yield": 116,
-        "async": 120,
-        "await": 121,
-        "of": 145,
-        "{": 17,
-        "}": 18,
-        "(": 19,
-        ")": 20,
-        "[": 21,
-        "]": 22,
-        ".": 23,
-        "...": 24,
-        ";": 25,
-        ",": 26,
-        "<": 27,
-        ">": 29,
-        "<=": 30,
-        ">=": 31,
-        "==": 32,
-        "!=": 33,
-        "===": 34,
-        "!==": 35,
-        "=>": 36,
-        "+": 37,
-        "-": 38,
-        "**": 40,
-        "*": 39,
-        "/": 41,
-        "%": 42,
-        "++": 43,
-        "--": 44,
-        "<<": 45,
-        "</": 28,
-        ">>": 46,
-        ">>>": 47,
-        "&": 48,
-        "|": 49,
-        "^": 50,
-        "!": 51,
-        "~": 52,
-        "&&": 53,
-        "||": 54,
-        "?": 55,
-        ":": 56,
-        "=": 58,
-        "+=": 59,
-        "-=": 60,
-        "*=": 61,
-        "**=": 62,
-        "/=": 63,
-        "%=": 64,
-        "<<=": 65,
-        ">>=": 66,
-        ">>>=": 67,
-        "&=": 68,
-        "|=": 69,
-        "^=": 70,
-        "@": 57,
+        "abstract": 117 /* AbstractKeyword */,
+        "any": 119 /* AnyKeyword */,
+        "as": 118 /* AsKeyword */,
+        "boolean": 122 /* BooleanKeyword */,
+        "break": 72 /* BreakKeyword */,
+        "case": 73 /* CaseKeyword */,
+        "catch": 74 /* CatchKeyword */,
+        "class": 75 /* ClassKeyword */,
+        "continue": 77 /* ContinueKeyword */,
+        "const": 76 /* ConstKeyword */,
+        "constructor": 123 /* ConstructorKeyword */,
+        "debugger": 78 /* DebuggerKeyword */,
+        "declare": 124 /* DeclareKeyword */,
+        "default": 79 /* DefaultKeyword */,
+        "delete": 80 /* DeleteKeyword */,
+        "do": 81 /* DoKeyword */,
+        "else": 82 /* ElseKeyword */,
+        "enum": 83 /* EnumKeyword */,
+        "export": 84 /* ExportKeyword */,
+        "extends": 85 /* ExtendsKeyword */,
+        "false": 86 /* FalseKeyword */,
+        "finally": 87 /* FinallyKeyword */,
+        "for": 88 /* ForKeyword */,
+        "from": 143 /* FromKeyword */,
+        "function": 89 /* FunctionKeyword */,
+        "get": 125 /* GetKeyword */,
+        "if": 90 /* IfKeyword */,
+        "implements": 108 /* ImplementsKeyword */,
+        "import": 91 /* ImportKeyword */,
+        "in": 92 /* InKeyword */,
+        "infer": 126 /* InferKeyword */,
+        "instanceof": 93 /* InstanceOfKeyword */,
+        "interface": 109 /* InterfaceKeyword */,
+        "is": 127 /* IsKeyword */,
+        "keyof": 128 /* KeyOfKeyword */,
+        "let": 110 /* LetKeyword */,
+        "module": 129 /* ModuleKeyword */,
+        "namespace": 130 /* NamespaceKeyword */,
+        "never": 131 /* NeverKeyword */,
+        "new": 94 /* NewKeyword */,
+        "null": 95 /* NullKeyword */,
+        "number": 134 /* NumberKeyword */,
+        "object": 135 /* ObjectKeyword */,
+        "package": 111 /* PackageKeyword */,
+        "private": 112 /* PrivateKeyword */,
+        "protected": 113 /* ProtectedKeyword */,
+        "public": 114 /* PublicKeyword */,
+        "readonly": 132 /* ReadonlyKeyword */,
+        "require": 133 /* RequireKeyword */,
+        "global": 144 /* GlobalKeyword */,
+        "return": 96 /* ReturnKeyword */,
+        "set": 136 /* SetKeyword */,
+        "static": 115 /* StaticKeyword */,
+        "string": 137 /* StringKeyword */,
+        "super": 97 /* SuperKeyword */,
+        "switch": 98 /* SwitchKeyword */,
+        "symbol": 138 /* SymbolKeyword */,
+        "this": 99 /* ThisKeyword */,
+        "throw": 100 /* ThrowKeyword */,
+        "true": 101 /* TrueKeyword */,
+        "try": 102 /* TryKeyword */,
+        "type": 139 /* TypeKeyword */,
+        "typeof": 103 /* TypeOfKeyword */,
+        "undefined": 140 /* UndefinedKeyword */,
+        "unique": 141 /* UniqueKeyword */,
+        "unknown": 142 /* UnknownKeyword */,
+        "var": 104 /* VarKeyword */,
+        "void": 105 /* VoidKeyword */,
+        "while": 106 /* WhileKeyword */,
+        "with": 107 /* WithKeyword */,
+        "yield": 116 /* YieldKeyword */,
+        "async": 120 /* AsyncKeyword */,
+        "await": 121 /* AwaitKeyword */,
+        "of": 145 /* OfKeyword */,
+        "{": 17 /* OpenBraceToken */,
+        "}": 18 /* CloseBraceToken */,
+        "(": 19 /* OpenParenToken */,
+        ")": 20 /* CloseParenToken */,
+        "[": 21 /* OpenBracketToken */,
+        "]": 22 /* CloseBracketToken */,
+        ".": 23 /* DotToken */,
+        "...": 24 /* DotDotDotToken */,
+        ";": 25 /* SemicolonToken */,
+        ",": 26 /* CommaToken */,
+        "<": 27 /* LessThanToken */,
+        ">": 29 /* GreaterThanToken */,
+        "<=": 30 /* LessThanEqualsToken */,
+        ">=": 31 /* GreaterThanEqualsToken */,
+        "==": 32 /* EqualsEqualsToken */,
+        "!=": 33 /* ExclamationEqualsToken */,
+        "===": 34 /* EqualsEqualsEqualsToken */,
+        "!==": 35 /* ExclamationEqualsEqualsToken */,
+        "=>": 36 /* EqualsGreaterThanToken */,
+        "+": 37 /* PlusToken */,
+        "-": 38 /* MinusToken */,
+        "**": 40 /* AsteriskAsteriskToken */,
+        "*": 39 /* AsteriskToken */,
+        "/": 41 /* SlashToken */,
+        "%": 42 /* PercentToken */,
+        "++": 43 /* PlusPlusToken */,
+        "--": 44 /* MinusMinusToken */,
+        "<<": 45 /* LessThanLessThanToken */,
+        "</": 28 /* LessThanSlashToken */,
+        ">>": 46 /* GreaterThanGreaterThanToken */,
+        ">>>": 47 /* GreaterThanGreaterThanGreaterThanToken */,
+        "&": 48 /* AmpersandToken */,
+        "|": 49 /* BarToken */,
+        "^": 50 /* CaretToken */,
+        "!": 51 /* ExclamationToken */,
+        "~": 52 /* TildeToken */,
+        "&&": 53 /* AmpersandAmpersandToken */,
+        "||": 54 /* BarBarToken */,
+        "?": 55 /* QuestionToken */,
+        ":": 56 /* ColonToken */,
+        "=": 58 /* EqualsToken */,
+        "+=": 59 /* PlusEqualsToken */,
+        "-=": 60 /* MinusEqualsToken */,
+        "*=": 61 /* AsteriskEqualsToken */,
+        "**=": 62 /* AsteriskAsteriskEqualsToken */,
+        "/=": 63 /* SlashEqualsToken */,
+        "%=": 64 /* PercentEqualsToken */,
+        "<<=": 65 /* LessThanLessThanEqualsToken */,
+        ">>=": 66 /* GreaterThanGreaterThanEqualsToken */,
+        ">>>=": 67 /* GreaterThanGreaterThanGreaterThanEqualsToken */,
+        "&=": 68 /* AmpersandEqualsToken */,
+        "|=": 69 /* BarEqualsToken */,
+        "^=": 70 /* CaretEqualsToken */,
+        "@": 57 /* AtToken */,
     });
+    /*
+        As per ECMAScript Language Specification 3th Edition, Section 7.6: Identifiers
+        IdentifierStart ::
+            Can contain Unicode 3.0.0 categories:
+            Uppercase letter (Lu),
+            Lowercase letter (Ll),
+            Titlecase letter (Lt),
+            Modifier letter (Lm),
+            Other letter (Lo), or
+            Letter number (Nl).
+        IdentifierPart :: =
+            Can contain IdentifierStart + Unicode 3.0.0 categories:
+            Non-spacing mark (Mn),
+            Combining spacing mark (Mc),
+            Decimal number (Nd), or
+            Connector punctuation (Pc).
+
+        Codepoint ranges for ES3 Identifiers are extracted from the Unicode 3.0.0 specification at:
+        http://www.unicode.org/Public/3.0-Update/UnicodeData-3.0.0.txt
+    */
     var unicodeES3IdentifierStart = [170, 170, 181, 181, 186, 186, 192, 214, 216, 246, 248, 543, 546, 563, 592, 685, 688, 696, 699, 705, 720, 721, 736, 740, 750, 750, 890, 890, 902, 902, 904, 906, 908, 908, 910, 929, 931, 974, 976, 983, 986, 1011, 1024, 1153, 1164, 1220, 1223, 1224, 1227, 1228, 1232, 1269, 1272, 1273, 1329, 1366, 1369, 1369, 1377, 1415, 1488, 1514, 1520, 1522, 1569, 1594, 1600, 1610, 1649, 1747, 1749, 1749, 1765, 1766, 1786, 1788, 1808, 1808, 1810, 1836, 1920, 1957, 2309, 2361, 2365, 2365, 2384, 2384, 2392, 2401, 2437, 2444, 2447, 2448, 2451, 2472, 2474, 2480, 2482, 2482, 2486, 2489, 2524, 2525, 2527, 2529, 2544, 2545, 2565, 2570, 2575, 2576, 2579, 2600, 2602, 2608, 2610, 2611, 2613, 2614, 2616, 2617, 2649, 2652, 2654, 2654, 2674, 2676, 2693, 2699, 2701, 2701, 2703, 2705, 2707, 2728, 2730, 2736, 2738, 2739, 2741, 2745, 2749, 2749, 2768, 2768, 2784, 2784, 2821, 2828, 2831, 2832, 2835, 2856, 2858, 2864, 2866, 2867, 2870, 2873, 2877, 2877, 2908, 2909, 2911, 2913, 2949, 2954, 2958, 2960, 2962, 2965, 2969, 2970, 2972, 2972, 2974, 2975, 2979, 2980, 2984, 2986, 2990, 2997, 2999, 3001, 3077, 3084, 3086, 3088, 3090, 3112, 3114, 3123, 3125, 3129, 3168, 3169, 3205, 3212, 3214, 3216, 3218, 3240, 3242, 3251, 3253, 3257, 3294, 3294, 3296, 3297, 3333, 3340, 3342, 3344, 3346, 3368, 3370, 3385, 3424, 3425, 3461, 3478, 3482, 3505, 3507, 3515, 3517, 3517, 3520, 3526, 3585, 3632, 3634, 3635, 3648, 3654, 3713, 3714, 3716, 3716, 3719, 3720, 3722, 3722, 3725, 3725, 3732, 3735, 3737, 3743, 3745, 3747, 3749, 3749, 3751, 3751, 3754, 3755, 3757, 3760, 3762, 3763, 3773, 3773, 3776, 3780, 3782, 3782, 3804, 3805, 3840, 3840, 3904, 3911, 3913, 3946, 3976, 3979, 4096, 4129, 4131, 4135, 4137, 4138, 4176, 4181, 4256, 4293, 4304, 4342, 4352, 4441, 4447, 4514, 4520, 4601, 4608, 4614, 4616, 4678, 4680, 4680, 4682, 4685, 4688, 4694, 4696, 4696, 4698, 4701, 4704, 4742, 4744, 4744, 4746, 4749, 4752, 4782, 4784, 4784, 4786, 4789, 4792, 4798, 4800, 4800, 4802, 4805, 4808, 4814, 4816, 4822, 4824, 4846, 4848, 4878, 4880, 4880, 4882, 4885, 4888, 4894, 4896, 4934, 4936, 4954, 5024, 5108, 5121, 5740, 5743, 5750, 5761, 5786, 5792, 5866, 6016, 6067, 6176, 6263, 6272, 6312, 7680, 7835, 7840, 7929, 7936, 7957, 7960, 7965, 7968, 8005, 8008, 8013, 8016, 8023, 8025, 8025, 8027, 8027, 8029, 8029, 8031, 8061, 8064, 8116, 8118, 8124, 8126, 8126, 8130, 8132, 8134, 8140, 8144, 8147, 8150, 8155, 8160, 8172, 8178, 8180, 8182, 8188, 8319, 8319, 8450, 8450, 8455, 8455, 8458, 8467, 8469, 8469, 8473, 8477, 8484, 8484, 8486, 8486, 8488, 8488, 8490, 8493, 8495, 8497, 8499, 8505, 8544, 8579, 12293, 12295, 12321, 12329, 12337, 12341, 12344, 12346, 12353, 12436, 12445, 12446, 12449, 12538, 12540, 12542, 12549, 12588, 12593, 12686, 12704, 12727, 13312, 19893, 19968, 40869, 40960, 42124, 44032, 55203, 63744, 64045, 64256, 64262, 64275, 64279, 64285, 64285, 64287, 64296, 64298, 64310, 64312, 64316, 64318, 64318, 64320, 64321, 64323, 64324, 64326, 64433, 64467, 64829, 64848, 64911, 64914, 64967, 65008, 65019, 65136, 65138, 65140, 65140, 65142, 65276, 65313, 65338, 65345, 65370, 65382, 65470, 65474, 65479, 65482, 65487, 65490, 65495, 65498, 65500,];
     var unicodeES3IdentifierPart = [170, 170, 181, 181, 186, 186, 192, 214, 216, 246, 248, 543, 546, 563, 592, 685, 688, 696, 699, 705, 720, 721, 736, 740, 750, 750, 768, 846, 864, 866, 890, 890, 902, 902, 904, 906, 908, 908, 910, 929, 931, 974, 976, 983, 986, 1011, 1024, 1153, 1155, 1158, 1164, 1220, 1223, 1224, 1227, 1228, 1232, 1269, 1272, 1273, 1329, 1366, 1369, 1369, 1377, 1415, 1425, 1441, 1443, 1465, 1467, 1469, 1471, 1471, 1473, 1474, 1476, 1476, 1488, 1514, 1520, 1522, 1569, 1594, 1600, 1621, 1632, 1641, 1648, 1747, 1749, 1756, 1759, 1768, 1770, 1773, 1776, 1788, 1808, 1836, 1840, 1866, 1920, 1968, 2305, 2307, 2309, 2361, 2364, 2381, 2384, 2388, 2392, 2403, 2406, 2415, 2433, 2435, 2437, 2444, 2447, 2448, 2451, 2472, 2474, 2480, 2482, 2482, 2486, 2489, 2492, 2492, 2494, 2500, 2503, 2504, 2507, 2509, 2519, 2519, 2524, 2525, 2527, 2531, 2534, 2545, 2562, 2562, 2565, 2570, 2575, 2576, 2579, 2600, 2602, 2608, 2610, 2611, 2613, 2614, 2616, 2617, 2620, 2620, 2622, 2626, 2631, 2632, 2635, 2637, 2649, 2652, 2654, 2654, 2662, 2676, 2689, 2691, 2693, 2699, 2701, 2701, 2703, 2705, 2707, 2728, 2730, 2736, 2738, 2739, 2741, 2745, 2748, 2757, 2759, 2761, 2763, 2765, 2768, 2768, 2784, 2784, 2790, 2799, 2817, 2819, 2821, 2828, 2831, 2832, 2835, 2856, 2858, 2864, 2866, 2867, 2870, 2873, 2876, 2883, 2887, 2888, 2891, 2893, 2902, 2903, 2908, 2909, 2911, 2913, 2918, 2927, 2946, 2947, 2949, 2954, 2958, 2960, 2962, 2965, 2969, 2970, 2972, 2972, 2974, 2975, 2979, 2980, 2984, 2986, 2990, 2997, 2999, 3001, 3006, 3010, 3014, 3016, 3018, 3021, 3031, 3031, 3047, 3055, 3073, 3075, 3077, 3084, 3086, 3088, 3090, 3112, 3114, 3123, 3125, 3129, 3134, 3140, 3142, 3144, 3146, 3149, 3157, 3158, 3168, 3169, 3174, 3183, 3202, 3203, 3205, 3212, 3214, 3216, 3218, 3240, 3242, 3251, 3253, 3257, 3262, 3268, 3270, 3272, 3274, 3277, 3285, 3286, 3294, 3294, 3296, 3297, 3302, 3311, 3330, 3331, 3333, 3340, 3342, 3344, 3346, 3368, 3370, 3385, 3390, 3395, 3398, 3400, 3402, 3405, 3415, 3415, 3424, 3425, 3430, 3439, 3458, 3459, 3461, 3478, 3482, 3505, 3507, 3515, 3517, 3517, 3520, 3526, 3530, 3530, 3535, 3540, 3542, 3542, 3544, 3551, 3570, 3571, 3585, 3642, 3648, 3662, 3664, 3673, 3713, 3714, 3716, 3716, 3719, 3720, 3722, 3722, 3725, 3725, 3732, 3735, 3737, 3743, 3745, 3747, 3749, 3749, 3751, 3751, 3754, 3755, 3757, 3769, 3771, 3773, 3776, 3780, 3782, 3782, 3784, 3789, 3792, 3801, 3804, 3805, 3840, 3840, 3864, 3865, 3872, 3881, 3893, 3893, 3895, 3895, 3897, 3897, 3902, 3911, 3913, 3946, 3953, 3972, 3974, 3979, 3984, 3991, 3993, 4028, 4038, 4038, 4096, 4129, 4131, 4135, 4137, 4138, 4140, 4146, 4150, 4153, 4160, 4169, 4176, 4185, 4256, 4293, 4304, 4342, 4352, 4441, 4447, 4514, 4520, 4601, 4608, 4614, 4616, 4678, 4680, 4680, 4682, 4685, 4688, 4694, 4696, 4696, 4698, 4701, 4704, 4742, 4744, 4744, 4746, 4749, 4752, 4782, 4784, 4784, 4786, 4789, 4792, 4798, 4800, 4800, 4802, 4805, 4808, 4814, 4816, 4822, 4824, 4846, 4848, 4878, 4880, 4880, 4882, 4885, 4888, 4894, 4896, 4934, 4936, 4954, 4969, 4977, 5024, 5108, 5121, 5740, 5743, 5750, 5761, 5786, 5792, 5866, 6016, 6099, 6112, 6121, 6160, 6169, 6176, 6263, 6272, 6313, 7680, 7835, 7840, 7929, 7936, 7957, 7960, 7965, 7968, 8005, 8008, 8013, 8016, 8023, 8025, 8025, 8027, 8027, 8029, 8029, 8031, 8061, 8064, 8116, 8118, 8124, 8126, 8126, 8130, 8132, 8134, 8140, 8144, 8147, 8150, 8155, 8160, 8172, 8178, 8180, 8182, 8188, 8255, 8256, 8319, 8319, 8400, 8412, 8417, 8417, 8450, 8450, 8455, 8455, 8458, 8467, 8469, 8469, 8473, 8477, 8484, 8484, 8486, 8486, 8488, 8488, 8490, 8493, 8495, 8497, 8499, 8505, 8544, 8579, 12293, 12295, 12321, 12335, 12337, 12341, 12344, 12346, 12353, 12436, 12441, 12442, 12445, 12446, 12449, 12542, 12549, 12588, 12593, 12686, 12704, 12727, 13312, 19893, 19968, 40869, 40960, 42124, 44032, 55203, 63744, 64045, 64256, 64262, 64275, 64279, 64285, 64296, 64298, 64310, 64312, 64316, 64318, 64318, 64320, 64321, 64323, 64324, 64326, 64433, 64467, 64829, 64848, 64911, 64914, 64967, 65008, 65019, 65056, 65059, 65075, 65076, 65101, 65103, 65136, 65138, 65140, 65140, 65142, 65276, 65296, 65305, 65313, 65338, 65343, 65343, 65345, 65370, 65381, 65470, 65474, 65479, 65482, 65487, 65490, 65495, 65498, 65500,];
+    /*
+        As per ECMAScript Language Specification 5th Edition, Section 7.6: ISyntaxToken Names and Identifiers
+        IdentifierStart ::
+            Can contain Unicode 6.2 categories:
+            Uppercase letter (Lu),
+            Lowercase letter (Ll),
+            Titlecase letter (Lt),
+            Modifier letter (Lm),
+            Other letter (Lo), or
+            Letter number (Nl).
+        IdentifierPart ::
+            Can contain IdentifierStart + Unicode 6.2 categories:
+            Non-spacing mark (Mn),
+            Combining spacing mark (Mc),
+            Decimal number (Nd),
+            Connector punctuation (Pc),
+            <ZWNJ>, or
+            <ZWJ>.
+
+        Codepoint ranges for ES5 Identifiers are extracted from the Unicode 6.2 specification at:
+        http://www.unicode.org/Public/6.2.0/ucd/UnicodeData.txt
+    */
     var unicodeES5IdentifierStart = [170, 170, 181, 181, 186, 186, 192, 214, 216, 246, 248, 705, 710, 721, 736, 740, 748, 748, 750, 750, 880, 884, 886, 887, 890, 893, 902, 902, 904, 906, 908, 908, 910, 929, 931, 1013, 1015, 1153, 1162, 1319, 1329, 1366, 1369, 1369, 1377, 1415, 1488, 1514, 1520, 1522, 1568, 1610, 1646, 1647, 1649, 1747, 1749, 1749, 1765, 1766, 1774, 1775, 1786, 1788, 1791, 1791, 1808, 1808, 1810, 1839, 1869, 1957, 1969, 1969, 1994, 2026, 2036, 2037, 2042, 2042, 2048, 2069, 2074, 2074, 2084, 2084, 2088, 2088, 2112, 2136, 2208, 2208, 2210, 2220, 2308, 2361, 2365, 2365, 2384, 2384, 2392, 2401, 2417, 2423, 2425, 2431, 2437, 2444, 2447, 2448, 2451, 2472, 2474, 2480, 2482, 2482, 2486, 2489, 2493, 2493, 2510, 2510, 2524, 2525, 2527, 2529, 2544, 2545, 2565, 2570, 2575, 2576, 2579, 2600, 2602, 2608, 2610, 2611, 2613, 2614, 2616, 2617, 2649, 2652, 2654, 2654, 2674, 2676, 2693, 2701, 2703, 2705, 2707, 2728, 2730, 2736, 2738, 2739, 2741, 2745, 2749, 2749, 2768, 2768, 2784, 2785, 2821, 2828, 2831, 2832, 2835, 2856, 2858, 2864, 2866, 2867, 2869, 2873, 2877, 2877, 2908, 2909, 2911, 2913, 2929, 2929, 2947, 2947, 2949, 2954, 2958, 2960, 2962, 2965, 2969, 2970, 2972, 2972, 2974, 2975, 2979, 2980, 2984, 2986, 2990, 3001, 3024, 3024, 3077, 3084, 3086, 3088, 3090, 3112, 3114, 3123, 3125, 3129, 3133, 3133, 3160, 3161, 3168, 3169, 3205, 3212, 3214, 3216, 3218, 3240, 3242, 3251, 3253, 3257, 3261, 3261, 3294, 3294, 3296, 3297, 3313, 3314, 3333, 3340, 3342, 3344, 3346, 3386, 3389, 3389, 3406, 3406, 3424, 3425, 3450, 3455, 3461, 3478, 3482, 3505, 3507, 3515, 3517, 3517, 3520, 3526, 3585, 3632, 3634, 3635, 3648, 3654, 3713, 3714, 3716, 3716, 3719, 3720, 3722, 3722, 3725, 3725, 3732, 3735, 3737, 3743, 3745, 3747, 3749, 3749, 3751, 3751, 3754, 3755, 3757, 3760, 3762, 3763, 3773, 3773, 3776, 3780, 3782, 3782, 3804, 3807, 3840, 3840, 3904, 3911, 3913, 3948, 3976, 3980, 4096, 4138, 4159, 4159, 4176, 4181, 4186, 4189, 4193, 4193, 4197, 4198, 4206, 4208, 4213, 4225, 4238, 4238, 4256, 4293, 4295, 4295, 4301, 4301, 4304, 4346, 4348, 4680, 4682, 4685, 4688, 4694, 4696, 4696, 4698, 4701, 4704, 4744, 4746, 4749, 4752, 4784, 4786, 4789, 4792, 4798, 4800, 4800, 4802, 4805, 4808, 4822, 4824, 4880, 4882, 4885, 4888, 4954, 4992, 5007, 5024, 5108, 5121, 5740, 5743, 5759, 5761, 5786, 5792, 5866, 5870, 5872, 5888, 5900, 5902, 5905, 5920, 5937, 5952, 5969, 5984, 5996, 5998, 6000, 6016, 6067, 6103, 6103, 6108, 6108, 6176, 6263, 6272, 6312, 6314, 6314, 6320, 6389, 6400, 6428, 6480, 6509, 6512, 6516, 6528, 6571, 6593, 6599, 6656, 6678, 6688, 6740, 6823, 6823, 6917, 6963, 6981, 6987, 7043, 7072, 7086, 7087, 7098, 7141, 7168, 7203, 7245, 7247, 7258, 7293, 7401, 7404, 7406, 7409, 7413, 7414, 7424, 7615, 7680, 7957, 7960, 7965, 7968, 8005, 8008, 8013, 8016, 8023, 8025, 8025, 8027, 8027, 8029, 8029, 8031, 8061, 8064, 8116, 8118, 8124, 8126, 8126, 8130, 8132, 8134, 8140, 8144, 8147, 8150, 8155, 8160, 8172, 8178, 8180, 8182, 8188, 8305, 8305, 8319, 8319, 8336, 8348, 8450, 8450, 8455, 8455, 8458, 8467, 8469, 8469, 8473, 8477, 8484, 8484, 8486, 8486, 8488, 8488, 8490, 8493, 8495, 8505, 8508, 8511, 8517, 8521, 8526, 8526, 8544, 8584, 11264, 11310, 11312, 11358, 11360, 11492, 11499, 11502, 11506, 11507, 11520, 11557, 11559, 11559, 11565, 11565, 11568, 11623, 11631, 11631, 11648, 11670, 11680, 11686, 11688, 11694, 11696, 11702, 11704, 11710, 11712, 11718, 11720, 11726, 11728, 11734, 11736, 11742, 11823, 11823, 12293, 12295, 12321, 12329, 12337, 12341, 12344, 12348, 12353, 12438, 12445, 12447, 12449, 12538, 12540, 12543, 12549, 12589, 12593, 12686, 12704, 12730, 12784, 12799, 13312, 19893, 19968, 40908, 40960, 42124, 42192, 42237, 42240, 42508, 42512, 42527, 42538, 42539, 42560, 42606, 42623, 42647, 42656, 42735, 42775, 42783, 42786, 42888, 42891, 42894, 42896, 42899, 42912, 42922, 43000, 43009, 43011, 43013, 43015, 43018, 43020, 43042, 43072, 43123, 43138, 43187, 43250, 43255, 43259, 43259, 43274, 43301, 43312, 43334, 43360, 43388, 43396, 43442, 43471, 43471, 43520, 43560, 43584, 43586, 43588, 43595, 43616, 43638, 43642, 43642, 43648, 43695, 43697, 43697, 43701, 43702, 43705, 43709, 43712, 43712, 43714, 43714, 43739, 43741, 43744, 43754, 43762, 43764, 43777, 43782, 43785, 43790, 43793, 43798, 43808, 43814, 43816, 43822, 43968, 44002, 44032, 55203, 55216, 55238, 55243, 55291, 63744, 64109, 64112, 64217, 64256, 64262, 64275, 64279, 64285, 64285, 64287, 64296, 64298, 64310, 64312, 64316, 64318, 64318, 64320, 64321, 64323, 64324, 64326, 64433, 64467, 64829, 64848, 64911, 64914, 64967, 65008, 65019, 65136, 65140, 65142, 65276, 65313, 65338, 65345, 65370, 65382, 65470, 65474, 65479, 65482, 65487, 65490, 65495, 65498, 65500,];
     var unicodeES5IdentifierPart = [170, 170, 181, 181, 186, 186, 192, 214, 216, 246, 248, 705, 710, 721, 736, 740, 748, 748, 750, 750, 768, 884, 886, 887, 890, 893, 902, 902, 904, 906, 908, 908, 910, 929, 931, 1013, 1015, 1153, 1155, 1159, 1162, 1319, 1329, 1366, 1369, 1369, 1377, 1415, 1425, 1469, 1471, 1471, 1473, 1474, 1476, 1477, 1479, 1479, 1488, 1514, 1520, 1522, 1552, 1562, 1568, 1641, 1646, 1747, 1749, 1756, 1759, 1768, 1770, 1788, 1791, 1791, 1808, 1866, 1869, 1969, 1984, 2037, 2042, 2042, 2048, 2093, 2112, 2139, 2208, 2208, 2210, 2220, 2276, 2302, 2304, 2403, 2406, 2415, 2417, 2423, 2425, 2431, 2433, 2435, 2437, 2444, 2447, 2448, 2451, 2472, 2474, 2480, 2482, 2482, 2486, 2489, 2492, 2500, 2503, 2504, 2507, 2510, 2519, 2519, 2524, 2525, 2527, 2531, 2534, 2545, 2561, 2563, 2565, 2570, 2575, 2576, 2579, 2600, 2602, 2608, 2610, 2611, 2613, 2614, 2616, 2617, 2620, 2620, 2622, 2626, 2631, 2632, 2635, 2637, 2641, 2641, 2649, 2652, 2654, 2654, 2662, 2677, 2689, 2691, 2693, 2701, 2703, 2705, 2707, 2728, 2730, 2736, 2738, 2739, 2741, 2745, 2748, 2757, 2759, 2761, 2763, 2765, 2768, 2768, 2784, 2787, 2790, 2799, 2817, 2819, 2821, 2828, 2831, 2832, 2835, 2856, 2858, 2864, 2866, 2867, 2869, 2873, 2876, 2884, 2887, 2888, 2891, 2893, 2902, 2903, 2908, 2909, 2911, 2915, 2918, 2927, 2929, 2929, 2946, 2947, 2949, 2954, 2958, 2960, 2962, 2965, 2969, 2970, 2972, 2972, 2974, 2975, 2979, 2980, 2984, 2986, 2990, 3001, 3006, 3010, 3014, 3016, 3018, 3021, 3024, 3024, 3031, 3031, 3046, 3055, 3073, 3075, 3077, 3084, 3086, 3088, 3090, 3112, 3114, 3123, 3125, 3129, 3133, 3140, 3142, 3144, 3146, 3149, 3157, 3158, 3160, 3161, 3168, 3171, 3174, 3183, 3202, 3203, 3205, 3212, 3214, 3216, 3218, 3240, 3242, 3251, 3253, 3257, 3260, 3268, 3270, 3272, 3274, 3277, 3285, 3286, 3294, 3294, 3296, 3299, 3302, 3311, 3313, 3314, 3330, 3331, 3333, 3340, 3342, 3344, 3346, 3386, 3389, 3396, 3398, 3400, 3402, 3406, 3415, 3415, 3424, 3427, 3430, 3439, 3450, 3455, 3458, 3459, 3461, 3478, 3482, 3505, 3507, 3515, 3517, 3517, 3520, 3526, 3530, 3530, 3535, 3540, 3542, 3542, 3544, 3551, 3570, 3571, 3585, 3642, 3648, 3662, 3664, 3673, 3713, 3714, 3716, 3716, 3719, 3720, 3722, 3722, 3725, 3725, 3732, 3735, 3737, 3743, 3745, 3747, 3749, 3749, 3751, 3751, 3754, 3755, 3757, 3769, 3771, 3773, 3776, 3780, 3782, 3782, 3784, 3789, 3792, 3801, 3804, 3807, 3840, 3840, 3864, 3865, 3872, 3881, 3893, 3893, 3895, 3895, 3897, 3897, 3902, 3911, 3913, 3948, 3953, 3972, 3974, 3991, 3993, 4028, 4038, 4038, 4096, 4169, 4176, 4253, 4256, 4293, 4295, 4295, 4301, 4301, 4304, 4346, 4348, 4680, 4682, 4685, 4688, 4694, 4696, 4696, 4698, 4701, 4704, 4744, 4746, 4749, 4752, 4784, 4786, 4789, 4792, 4798, 4800, 4800, 4802, 4805, 4808, 4822, 4824, 4880, 4882, 4885, 4888, 4954, 4957, 4959, 4992, 5007, 5024, 5108, 5121, 5740, 5743, 5759, 5761, 5786, 5792, 5866, 5870, 5872, 5888, 5900, 5902, 5908, 5920, 5940, 5952, 5971, 5984, 5996, 5998, 6000, 6002, 6003, 6016, 6099, 6103, 6103, 6108, 6109, 6112, 6121, 6155, 6157, 6160, 6169, 6176, 6263, 6272, 6314, 6320, 6389, 6400, 6428, 6432, 6443, 6448, 6459, 6470, 6509, 6512, 6516, 6528, 6571, 6576, 6601, 6608, 6617, 6656, 6683, 6688, 6750, 6752, 6780, 6783, 6793, 6800, 6809, 6823, 6823, 6912, 6987, 6992, 7001, 7019, 7027, 7040, 7155, 7168, 7223, 7232, 7241, 7245, 7293, 7376, 7378, 7380, 7414, 7424, 7654, 7676, 7957, 7960, 7965, 7968, 8005, 8008, 8013, 8016, 8023, 8025, 8025, 8027, 8027, 8029, 8029, 8031, 8061, 8064, 8116, 8118, 8124, 8126, 8126, 8130, 8132, 8134, 8140, 8144, 8147, 8150, 8155, 8160, 8172, 8178, 8180, 8182, 8188, 8204, 8205, 8255, 8256, 8276, 8276, 8305, 8305, 8319, 8319, 8336, 8348, 8400, 8412, 8417, 8417, 8421, 8432, 8450, 8450, 8455, 8455, 8458, 8467, 8469, 8469, 8473, 8477, 8484, 8484, 8486, 8486, 8488, 8488, 8490, 8493, 8495, 8505, 8508, 8511, 8517, 8521, 8526, 8526, 8544, 8584, 11264, 11310, 11312, 11358, 11360, 11492, 11499, 11507, 11520, 11557, 11559, 11559, 11565, 11565, 11568, 11623, 11631, 11631, 11647, 11670, 11680, 11686, 11688, 11694, 11696, 11702, 11704, 11710, 11712, 11718, 11720, 11726, 11728, 11734, 11736, 11742, 11744, 11775, 11823, 11823, 12293, 12295, 12321, 12335, 12337, 12341, 12344, 12348, 12353, 12438, 12441, 12442, 12445, 12447, 12449, 12538, 12540, 12543, 12549, 12589, 12593, 12686, 12704, 12730, 12784, 12799, 13312, 19893, 19968, 40908, 40960, 42124, 42192, 42237, 42240, 42508, 42512, 42539, 42560, 42607, 42612, 42621, 42623, 42647, 42655, 42737, 42775, 42783, 42786, 42888, 42891, 42894, 42896, 42899, 42912, 42922, 43000, 43047, 43072, 43123, 43136, 43204, 43216, 43225, 43232, 43255, 43259, 43259, 43264, 43309, 43312, 43347, 43360, 43388, 43392, 43456, 43471, 43481, 43520, 43574, 43584, 43597, 43600, 43609, 43616, 43638, 43642, 43643, 43648, 43714, 43739, 43741, 43744, 43759, 43762, 43766, 43777, 43782, 43785, 43790, 43793, 43798, 43808, 43814, 43816, 43822, 43968, 44010, 44012, 44013, 44016, 44025, 44032, 55203, 55216, 55238, 55243, 55291, 63744, 64109, 64112, 64217, 64256, 64262, 64275, 64279, 64285, 64296, 64298, 64310, 64312, 64316, 64318, 64318, 64320, 64321, 64323, 64324, 64326, 64433, 64467, 64829, 64848, 64911, 64914, 64967, 65008, 65019, 65024, 65039, 65056, 65062, 65075, 65076, 65101, 65103, 65136, 65140, 65142, 65276, 65296, 65305, 65313, 65338, 65343, 65343, 65345, 65370, 65382, 65470, 65474, 65479, 65482, 65487, 65490, 65495, 65498, 65500,];
     function lookupInUnicodeMap(code, map) {
+        // Bail out quickly if it couldn't possibly be in the map.
         if (code < map[0]) {
             return false;
         }
+        // Perform binary search in one of the Unicode range maps
         var lo = 0;
         var hi = map.length;
         var mid;
         while (lo + 1 < hi) {
             mid = lo + (hi - lo) / 2;
+            // mid has to be even to catch a range's beginning
             mid -= mid % 2;
             if (map[mid] <= code && code <= map[mid + 1]) {
                 return true;
@@ -6144,14 +5790,14 @@ var ts;
         }
         return false;
     }
-    function isUnicodeIdentifierStart(code, languageVersion) {
-        return languageVersion >= 1 ?
+    /* @internal */ function isUnicodeIdentifierStart(code, languageVersion) {
+        return languageVersion >= 1 /* ES5 */ ?
             lookupInUnicodeMap(code, unicodeES5IdentifierStart) :
             lookupInUnicodeMap(code, unicodeES3IdentifierStart);
     }
     ts.isUnicodeIdentifierStart = isUnicodeIdentifierStart;
     function isUnicodeIdentifierPart(code, languageVersion) {
-        return languageVersion >= 1 ?
+        return languageVersion >= 1 /* ES5 */ ?
             lookupInUnicodeMap(code, unicodeES5IdentifierPart) :
             lookupInUnicodeMap(code, unicodeES3IdentifierPart);
     }
@@ -6167,10 +5813,12 @@ var ts;
         return tokenStrings[t];
     }
     ts.tokenToString = tokenToString;
+    /* @internal */
     function stringToToken(s) {
         return textToToken.get(s);
     }
     ts.stringToToken = stringToToken;
+    /* @internal */
     function computeLineStarts(text) {
         var result = new Array();
         var pos = 0;
@@ -6179,16 +5827,17 @@ var ts;
             var ch = text.charCodeAt(pos);
             pos++;
             switch (ch) {
-                case 13:
-                    if (text.charCodeAt(pos) === 10) {
+                case 13 /* carriageReturn */:
+                    if (text.charCodeAt(pos) === 10 /* lineFeed */) {
                         pos++;
                     }
-                case 10:
+                // falls through
+                case 10 /* lineFeed */:
                     result.push(lineStart);
                     lineStart = pos;
                     break;
                 default:
-                    if (ch > 127 && isLineBreak(ch)) {
+                    if (ch > 127 /* maxAsciiCharacter */ && isLineBreak(ch)) {
                         result.push(lineStart);
                         lineStart = pos;
                     }
@@ -6203,6 +5852,7 @@ var ts;
         return computePositionOfLineAndCharacter(getLineStarts(sourceFile), line, character, sourceFile.text);
     }
     ts.getPositionOfLineAndCharacter = getPositionOfLineAndCharacter;
+    /* @internal */
     function computePositionOfLineAndCharacter(lineStarts, line, character, debugText) {
         if (line < 0 || line >= lineStarts.length) {
             ts.Debug.fail("Bad line number. Line: " + line + ", lineStarts.length: " + lineStarts.length + " , line map is correct? " + (debugText !== undefined ? ts.arraysEqual(lineStarts, computeLineStarts(debugText)) : "unknown"));
@@ -6212,18 +5862,30 @@ var ts;
             ts.Debug.assert(res < lineStarts[line + 1]);
         }
         else if (debugText !== undefined) {
-            ts.Debug.assert(res <= debugText.length);
+            ts.Debug.assert(res <= debugText.length); // Allow single character overflow for trailing newline
         }
         return res;
     }
     ts.computePositionOfLineAndCharacter = computePositionOfLineAndCharacter;
+    /* @internal */
     function getLineStarts(sourceFile) {
         return sourceFile.lineMap || (sourceFile.lineMap = computeLineStarts(sourceFile.text));
     }
     ts.getLineStarts = getLineStarts;
+    /* @internal */
+    /**
+     * We assume the first line starts at position 0 and 'position' is non-negative.
+     */
     function computeLineAndCharacterOfPosition(lineStarts, position) {
         var lineNumber = ts.binarySearch(lineStarts, position, ts.identity, ts.compareValues);
         if (lineNumber < 0) {
+            // If the actual position was not found,
+            // the binary search returns the 2's-complement of the next line start
+            // e.g. if the line starts at [5, 10, 23, 80] and the position requested was 20
+            // then the search will return -2.
+            //
+            // We want the index of the previous line start, so we subtract 1.
+            // Review 2's-complement if this is confusing.
             lineNumber = ~lineNumber - 1;
             ts.Debug.assert(lineNumber !== -1, "position cannot precede the beginning of the file");
         }
@@ -6241,86 +5903,107 @@ var ts;
         return isWhiteSpaceSingleLine(ch) || isLineBreak(ch);
     }
     ts.isWhiteSpaceLike = isWhiteSpaceLike;
+    /** Does not include line breaks. For that, see isWhiteSpaceLike. */
     function isWhiteSpaceSingleLine(ch) {
-        return ch === 32 ||
-            ch === 9 ||
-            ch === 11 ||
-            ch === 12 ||
-            ch === 160 ||
-            ch === 133 ||
-            ch === 5760 ||
-            ch >= 8192 && ch <= 8203 ||
-            ch === 8239 ||
-            ch === 8287 ||
-            ch === 12288 ||
-            ch === 65279;
+        // Note: nextLine is in the Zs space, and should be considered to be a whitespace.
+        // It is explicitly not a line-break as it isn't in the exact set specified by EcmaScript.
+        return ch === 32 /* space */ ||
+            ch === 9 /* tab */ ||
+            ch === 11 /* verticalTab */ ||
+            ch === 12 /* formFeed */ ||
+            ch === 160 /* nonBreakingSpace */ ||
+            ch === 133 /* nextLine */ ||
+            ch === 5760 /* ogham */ ||
+            ch >= 8192 /* enQuad */ && ch <= 8203 /* zeroWidthSpace */ ||
+            ch === 8239 /* narrowNoBreakSpace */ ||
+            ch === 8287 /* mathematicalSpace */ ||
+            ch === 12288 /* ideographicSpace */ ||
+            ch === 65279 /* byteOrderMark */;
     }
     ts.isWhiteSpaceSingleLine = isWhiteSpaceSingleLine;
     function isLineBreak(ch) {
-        return ch === 10 ||
-            ch === 13 ||
-            ch === 8232 ||
-            ch === 8233;
+        // ES5 7.3:
+        // The ECMAScript line terminator characters are listed in Table 3.
+        //     Table 3: Line Terminator Characters
+        //     Code Unit Value     Name                    Formal Name
+        //     \u000A              Line Feed               <LF>
+        //     \u000D              Carriage Return         <CR>
+        //     \u2028              Line separator          <LS>
+        //     \u2029              Paragraph separator     <PS>
+        // Only the characters in Table 3 are treated as line terminators. Other new line or line
+        // breaking characters are treated as white space but not as line terminators.
+        return ch === 10 /* lineFeed */ ||
+            ch === 13 /* carriageReturn */ ||
+            ch === 8232 /* lineSeparator */ ||
+            ch === 8233 /* paragraphSeparator */;
     }
     ts.isLineBreak = isLineBreak;
     function isDigit(ch) {
-        return ch >= 48 && ch <= 57;
+        return ch >= 48 /* _0 */ && ch <= 57 /* _9 */;
     }
+    /* @internal */
     function isOctalDigit(ch) {
-        return ch >= 48 && ch <= 55;
+        return ch >= 48 /* _0 */ && ch <= 55 /* _7 */;
     }
     ts.isOctalDigit = isOctalDigit;
     function couldStartTrivia(text, pos) {
+        // Keep in sync with skipTrivia
         var ch = text.charCodeAt(pos);
         switch (ch) {
-            case 13:
-            case 10:
-            case 9:
-            case 11:
-            case 12:
-            case 32:
-            case 47:
-            case 60:
-            case 124:
-            case 61:
-            case 62:
+            case 13 /* carriageReturn */:
+            case 10 /* lineFeed */:
+            case 9 /* tab */:
+            case 11 /* verticalTab */:
+            case 12 /* formFeed */:
+            case 32 /* space */:
+            case 47 /* slash */:
+            // starts of normal trivia
+            case 60 /* lessThan */:
+            case 124 /* bar */:
+            case 61 /* equals */:
+            case 62 /* greaterThan */:
+                // Starts of conflict marker trivia
                 return true;
-            case 35:
+            case 35 /* hash */:
+                // Only if its the beginning can we have #! trivia
                 return pos === 0;
             default:
-                return ch > 127;
+                return ch > 127 /* maxAsciiCharacter */;
         }
     }
     ts.couldStartTrivia = couldStartTrivia;
+    /* @internal */
     function skipTrivia(text, pos, stopAfterLineBreak, stopAtComments) {
         if (stopAtComments === void 0) { stopAtComments = false; }
         if (ts.positionIsSynthesized(pos)) {
             return pos;
         }
+        // Keep in sync with couldStartTrivia
         while (true) {
             var ch = text.charCodeAt(pos);
             switch (ch) {
-                case 13:
-                    if (text.charCodeAt(pos + 1) === 10) {
+                case 13 /* carriageReturn */:
+                    if (text.charCodeAt(pos + 1) === 10 /* lineFeed */) {
                         pos++;
                     }
-                case 10:
+                // falls through
+                case 10 /* lineFeed */:
                     pos++;
                     if (stopAfterLineBreak) {
                         return pos;
                     }
                     continue;
-                case 9:
-                case 11:
-                case 12:
-                case 32:
+                case 9 /* tab */:
+                case 11 /* verticalTab */:
+                case 12 /* formFeed */:
+                case 32 /* space */:
                     pos++;
                     continue;
-                case 47:
+                case 47 /* slash */:
                     if (stopAtComments) {
                         break;
                     }
-                    if (text.charCodeAt(pos + 1) === 47) {
+                    if (text.charCodeAt(pos + 1) === 47 /* slash */) {
                         pos += 2;
                         while (pos < text.length) {
                             if (isLineBreak(text.charCodeAt(pos))) {
@@ -6330,10 +6013,10 @@ var ts;
                         }
                         continue;
                     }
-                    if (text.charCodeAt(pos + 1) === 42) {
+                    if (text.charCodeAt(pos + 1) === 42 /* asterisk */) {
                         pos += 2;
                         while (pos < text.length) {
-                            if (text.charCodeAt(pos) === 42 && text.charCodeAt(pos + 1) === 47) {
+                            if (text.charCodeAt(pos) === 42 /* asterisk */ && text.charCodeAt(pos + 1) === 47 /* slash */) {
                                 pos += 2;
                                 break;
                             }
@@ -6342,23 +6025,23 @@ var ts;
                         continue;
                     }
                     break;
-                case 60:
-                case 124:
-                case 61:
-                case 62:
+                case 60 /* lessThan */:
+                case 124 /* bar */:
+                case 61 /* equals */:
+                case 62 /* greaterThan */:
                     if (isConflictMarkerTrivia(text, pos)) {
                         pos = scanConflictMarkerTrivia(text, pos);
                         continue;
                     }
                     break;
-                case 35:
+                case 35 /* hash */:
                     if (pos === 0 && isShebangTrivia(text, pos)) {
                         pos = scanShebangTrivia(text, pos);
                         continue;
                     }
                     break;
                 default:
-                    if (ch > 127 && (isWhiteSpaceLike(ch))) {
+                    if (ch > 127 /* maxAsciiCharacter */ && (isWhiteSpaceLike(ch))) {
                         pos++;
                         continue;
                     }
@@ -6368,9 +6051,12 @@ var ts;
         }
     }
     ts.skipTrivia = skipTrivia;
+    // All conflict markers consist of the same character repeated seven times.  If it is
+    // a <<<<<<< or >>>>>>> marker then it is also followed by a space.
     var mergeConflictMarkerLength = "<<<<<<<".length;
     function isConflictMarkerTrivia(text, pos) {
         ts.Debug.assert(pos >= 0);
+        // Conflict markers must be at the start of a line.
         if (pos === 0 || isLineBreak(text.charCodeAt(pos - 1))) {
             var ch = text.charCodeAt(pos);
             if ((pos + mergeConflictMarkerLength) < text.length) {
@@ -6379,8 +6065,8 @@ var ts;
                         return false;
                     }
                 }
-                return ch === 61 ||
-                    text.charCodeAt(pos + mergeConflictMarkerLength) === 32;
+                return ch === 61 /* equals */ ||
+                    text.charCodeAt(pos + mergeConflictMarkerLength) === 32 /* space */;
             }
         }
         return false;
@@ -6391,16 +6077,18 @@ var ts;
         }
         var ch = text.charCodeAt(pos);
         var len = text.length;
-        if (ch === 60 || ch === 62) {
+        if (ch === 60 /* lessThan */ || ch === 62 /* greaterThan */) {
             while (pos < len && !isLineBreak(text.charCodeAt(pos))) {
                 pos++;
             }
         }
         else {
-            ts.Debug.assert(ch === 124 || ch === 61);
+            ts.Debug.assert(ch === 124 /* bar */ || ch === 61 /* equals */);
+            // Consume everything from the start of a ||||||| or ======= marker to the start
+            // of the next ======= or >>>>>>> marker.
             while (pos < len) {
                 var currentChar = text.charCodeAt(pos);
-                if ((currentChar === 61 || currentChar === 62) && currentChar !== ch && isConflictMarkerTrivia(text, pos)) {
+                if ((currentChar === 61 /* equals */ || currentChar === 62 /* greaterThan */) && currentChar !== ch && isConflictMarkerTrivia(text, pos)) {
                     break;
                 }
                 pos++;
@@ -6410,6 +6098,7 @@ var ts;
     }
     var shebangTriviaRegex = /^#!.*/;
     function isShebangTrivia(text, pos) {
+        // Shebangs check must only be done at the start of the file
         ts.Debug.assert(pos === 0);
         return shebangTriviaRegex.test(text);
     }
@@ -6418,6 +6107,26 @@ var ts;
         pos = pos + shebang.length;
         return pos;
     }
+    /**
+     * Invokes a callback for each comment range following the provided position.
+     *
+     * Single-line comment ranges include the leading double-slash characters but not the ending
+     * line break. Multi-line comment ranges include the leading slash-asterisk and trailing
+     * asterisk-slash characters.
+     *
+     * @param reduce If true, accumulates the result of calling the callback in a fashion similar
+     *      to reduceLeft. If false, iteration stops when the callback returns a truthy value.
+     * @param text The source text to scan.
+     * @param pos The position at which to start scanning.
+     * @param trailing If false, whitespace is skipped until the first line break and comments
+     *      between that location and the next token are returned. If true, comments occurring
+     *      between the given position and the next line break are returned.
+     * @param cb The callback to execute as each comment range is encountered.
+     * @param state A state value to pass to each iteration of the callback.
+     * @param initial An initial value to pass when accumulating results (when "reduce" is true).
+     * @returns If "reduce" is true, the accumulated value. If "reduce" is false, the first truthy
+     *      return value of the callback.
+     */
     function iterateCommentRanges(reduce, text, pos, trailing, cb, state, initial) {
         var pendingPos;
         var pendingEnd;
@@ -6429,11 +6138,12 @@ var ts;
         scan: while (pos >= 0 && pos < text.length) {
             var ch = text.charCodeAt(pos);
             switch (ch) {
-                case 13:
-                    if (text.charCodeAt(pos + 1) === 10) {
+                case 13 /* carriageReturn */:
+                    if (text.charCodeAt(pos + 1) === 10 /* lineFeed */) {
                         pos++;
                     }
-                case 10:
+                // falls through
+                case 10 /* lineFeed */:
                     pos++;
                     if (trailing) {
                         break scan;
@@ -6443,20 +6153,20 @@ var ts;
                         pendingHasTrailingNewLine = true;
                     }
                     continue;
-                case 9:
-                case 11:
-                case 12:
-                case 32:
+                case 9 /* tab */:
+                case 11 /* verticalTab */:
+                case 12 /* formFeed */:
+                case 32 /* space */:
                     pos++;
                     continue;
-                case 47:
+                case 47 /* slash */:
                     var nextChar = text.charCodeAt(pos + 1);
                     var hasTrailingNewLine = false;
-                    if (nextChar === 47 || nextChar === 42) {
-                        var kind = nextChar === 47 ? 2 : 3;
+                    if (nextChar === 47 /* slash */ || nextChar === 42 /* asterisk */) {
+                        var kind = nextChar === 47 /* slash */ ? 2 /* SingleLineCommentTrivia */ : 3 /* MultiLineCommentTrivia */;
                         var startPos = pos;
                         pos += 2;
-                        if (nextChar === 47) {
+                        if (nextChar === 47 /* slash */) {
                             while (pos < text.length) {
                                 if (isLineBreak(text.charCodeAt(pos))) {
                                     hasTrailingNewLine = true;
@@ -6467,7 +6177,7 @@ var ts;
                         }
                         else {
                             while (pos < text.length) {
-                                if (text.charCodeAt(pos) === 42 && text.charCodeAt(pos + 1) === 47) {
+                                if (text.charCodeAt(pos) === 42 /* asterisk */ && text.charCodeAt(pos + 1) === 47 /* slash */) {
                                     pos += 2;
                                     break;
                                 }
@@ -6478,6 +6188,7 @@ var ts;
                             if (hasPendingCommentRange) {
                                 accumulator = cb(pendingPos, pendingEnd, pendingKind, pendingHasTrailingNewLine, state, accumulator);
                                 if (!reduce && accumulator) {
+                                    // If we are not reducing and we have a truthy result, return it.
                                     return accumulator;
                                 }
                             }
@@ -6491,7 +6202,7 @@ var ts;
                     }
                     break scan;
                 default:
-                    if (ch > 127 && (isWhiteSpaceLike(ch))) {
+                    if (ch > 127 /* maxAsciiCharacter */ && (isWhiteSpaceLike(ch))) {
                         if (hasPendingCommentRange && isLineBreak(ch)) {
                             pendingHasTrailingNewLine = true;
                         }
@@ -6507,19 +6218,19 @@ var ts;
         return accumulator;
     }
     function forEachLeadingCommentRange(text, pos, cb, state) {
-        return iterateCommentRanges(false, text, pos, false, cb, state);
+        return iterateCommentRanges(/*reduce*/ false, text, pos, /*trailing*/ false, cb, state);
     }
     ts.forEachLeadingCommentRange = forEachLeadingCommentRange;
     function forEachTrailingCommentRange(text, pos, cb, state) {
-        return iterateCommentRanges(false, text, pos, true, cb, state);
+        return iterateCommentRanges(/*reduce*/ false, text, pos, /*trailing*/ true, cb, state);
     }
     ts.forEachTrailingCommentRange = forEachTrailingCommentRange;
     function reduceEachLeadingCommentRange(text, pos, cb, state, initial) {
-        return iterateCommentRanges(true, text, pos, false, cb, state, initial);
+        return iterateCommentRanges(/*reduce*/ true, text, pos, /*trailing*/ false, cb, state, initial);
     }
     ts.reduceEachLeadingCommentRange = reduceEachLeadingCommentRange;
     function reduceEachTrailingCommentRange(text, pos, cb, state, initial) {
-        return iterateCommentRanges(true, text, pos, true, cb, state, initial);
+        return iterateCommentRanges(/*reduce*/ true, text, pos, /*trailing*/ true, cb, state, initial);
     }
     ts.reduceEachTrailingCommentRange = reduceEachTrailingCommentRange;
     function appendCommentRange(pos, end, kind, hasTrailingNewLine, _state, comments) {
@@ -6530,13 +6241,14 @@ var ts;
         return comments;
     }
     function getLeadingCommentRanges(text, pos) {
-        return reduceEachLeadingCommentRange(text, pos, appendCommentRange, undefined, undefined);
+        return reduceEachLeadingCommentRange(text, pos, appendCommentRange, /*state*/ undefined, /*initial*/ undefined);
     }
     ts.getLeadingCommentRanges = getLeadingCommentRanges;
     function getTrailingCommentRanges(text, pos) {
-        return reduceEachTrailingCommentRange(text, pos, appendCommentRange, undefined, undefined);
+        return reduceEachTrailingCommentRange(text, pos, appendCommentRange, /*state*/ undefined, /*initial*/ undefined);
     }
     ts.getTrailingCommentRanges = getTrailingCommentRanges;
+    /** Optionally, get the shebang */
     function getShebang(text) {
         var match = shebangTriviaRegex.exec(text);
         if (match) {
@@ -6545,17 +6257,18 @@ var ts;
     }
     ts.getShebang = getShebang;
     function isIdentifierStart(ch, languageVersion) {
-        return ch >= 65 && ch <= 90 || ch >= 97 && ch <= 122 ||
-            ch === 36 || ch === 95 ||
-            ch > 127 && isUnicodeIdentifierStart(ch, languageVersion);
+        return ch >= 65 /* A */ && ch <= 90 /* Z */ || ch >= 97 /* a */ && ch <= 122 /* z */ ||
+            ch === 36 /* $ */ || ch === 95 /* _ */ ||
+            ch > 127 /* maxAsciiCharacter */ && isUnicodeIdentifierStart(ch, languageVersion);
     }
     ts.isIdentifierStart = isIdentifierStart;
     function isIdentifierPart(ch, languageVersion) {
-        return ch >= 65 && ch <= 90 || ch >= 97 && ch <= 122 ||
-            ch >= 48 && ch <= 57 || ch === 36 || ch === 95 ||
-            ch > 127 && isUnicodeIdentifierPart(ch, languageVersion);
+        return ch >= 65 /* A */ && ch <= 90 /* Z */ || ch >= 97 /* a */ && ch <= 122 /* z */ ||
+            ch >= 48 /* _0 */ && ch <= 57 /* _9 */ || ch === 36 /* $ */ || ch === 95 /* _ */ ||
+            ch > 127 /* maxAsciiCharacter */ && isUnicodeIdentifierPart(ch, languageVersion);
     }
     ts.isIdentifierPart = isIdentifierPart;
+    /* @internal */
     function isIdentifierText(name, languageVersion) {
         if (!isIdentifierStart(name.charCodeAt(0), languageVersion)) {
             return false;
@@ -6568,12 +6281,17 @@ var ts;
         return true;
     }
     ts.isIdentifierText = isIdentifierText;
+    // Creates a scanner over a (possibly unspecified) range of a piece of text.
     function createScanner(languageVersion, skipTrivia, languageVariant, textInitial, onError, start, length) {
-        if (languageVariant === void 0) { languageVariant = 0; }
+        if (languageVariant === void 0) { languageVariant = 0 /* Standard */; }
         var text = textInitial;
+        // Current position (end position of text of current token)
         var pos;
+        // end of text
         var end;
+        // Start position of whitespace before current token
         var startPos;
+        // Start position of text of current token
         var tokenPos;
         var token;
         var tokenValue;
@@ -6586,11 +6304,11 @@ var ts;
             getTokenPos: function () { return tokenPos; },
             getTokenText: function () { return text.substring(tokenPos, pos); },
             getTokenValue: function () { return tokenValue; },
-            hasExtendedUnicodeEscape: function () { return (tokenFlags & 8) !== 0; },
-            hasPrecedingLineBreak: function () { return (tokenFlags & 1) !== 0; },
-            isIdentifier: function () { return token === 71 || token > 107; },
-            isReservedWord: function () { return token >= 72 && token <= 107; },
-            isUnterminated: function () { return (tokenFlags & 4) !== 0; },
+            hasExtendedUnicodeEscape: function () { return (tokenFlags & 8 /* ExtendedUnicodeEscape */) !== 0; },
+            hasPrecedingLineBreak: function () { return (tokenFlags & 1 /* PrecedingLineBreak */) !== 0; },
+            isIdentifier: function () { return token === 71 /* Identifier */ || token > 107 /* LastReservedWord */; },
+            isReservedWord: function () { return token >= 72 /* FirstReservedWord */ && token <= 107 /* LastReservedWord */; },
+            isUnterminated: function () { return (tokenFlags & 4 /* Unterminated */) !== 0; },
             getTokenFlags: function () { return tokenFlags; },
             reScanGreaterToken: reScanGreaterToken,
             reScanSlashToken: reScanSlashToken,
@@ -6627,8 +6345,8 @@ var ts;
             var result = "";
             while (true) {
                 var ch = text.charCodeAt(pos);
-                if (ch === 95) {
-                    tokenFlags |= 512;
+                if (ch === 95 /* _ */) {
+                    tokenFlags |= 512 /* ContainsSeparator */;
                     if (allowSeparator) {
                         allowSeparator = false;
                         isPreviousTokenSeparator = true;
@@ -6652,7 +6370,7 @@ var ts;
                 }
                 break;
             }
-            if (text.charCodeAt(pos - 1) === 95) {
+            if (text.charCodeAt(pos - 1) === 95 /* _ */) {
                 error(ts.Diagnostics.Numeric_separators_are_not_allowed_here, pos - 1, 1);
             }
             return result + text.substring(start, pos);
@@ -6662,15 +6380,15 @@ var ts;
             var mainFragment = scanNumberFragment();
             var decimalFragment;
             var scientificFragment;
-            if (text.charCodeAt(pos) === 46) {
+            if (text.charCodeAt(pos) === 46 /* dot */) {
                 pos++;
                 decimalFragment = scanNumberFragment();
             }
             var end = pos;
-            if (text.charCodeAt(pos) === 69 || text.charCodeAt(pos) === 101) {
+            if (text.charCodeAt(pos) === 69 /* E */ || text.charCodeAt(pos) === 101 /* e */) {
                 pos++;
-                tokenFlags |= 16;
-                if (text.charCodeAt(pos) === 43 || text.charCodeAt(pos) === 45)
+                tokenFlags |= 16 /* Scientific */;
+                if (text.charCodeAt(pos) === 43 /* plus */ || text.charCodeAt(pos) === 45 /* minus */)
                     pos++;
                 var preNumericPart = pos;
                 var finalFragment = scanNumberFragment();
@@ -6682,7 +6400,7 @@ var ts;
                     end = pos;
                 }
             }
-            if (tokenFlags & 512) {
+            if (tokenFlags & 512 /* ContainsSeparator */) {
                 var result = mainFragment;
                 if (decimalFragment) {
                     result += "." + decimalFragment;
@@ -6693,7 +6411,7 @@ var ts;
                 return "" + +result;
             }
             else {
-                return "" + +(text.substring(start, end));
+                return "" + +(text.substring(start, end)); // No need to use all the fragments; no _ removal needed
             }
         }
         function scanOctalDigits() {
@@ -6703,11 +6421,19 @@ var ts;
             }
             return +(text.substring(start, pos));
         }
+        /**
+         * Scans the given number of hexadecimal digits in the text,
+         * returning -1 if the given number is unavailable.
+         */
         function scanExactNumberOfHexDigits(count, canHaveSeparators) {
-            return scanHexDigits(count, false, canHaveSeparators);
+            return scanHexDigits(/*minCount*/ count, /*scanAsManyAsPossible*/ false, canHaveSeparators);
         }
+        /**
+         * Scans as many hexadecimal digits as are available in the text,
+         * returning -1 if the given number of digits was unavailable.
+         */
         function scanMinimumNumberOfHexDigits(count, canHaveSeparators) {
-            return scanHexDigits(count, true, canHaveSeparators);
+            return scanHexDigits(/*minCount*/ count, /*scanAsManyAsPossible*/ true, canHaveSeparators);
         }
         function scanHexDigits(minCount, scanAsManyAsPossible, canHaveSeparators) {
             var digits = 0;
@@ -6716,8 +6442,8 @@ var ts;
             var isPreviousTokenSeparator = false;
             while (digits < minCount || scanAsManyAsPossible) {
                 var ch = text.charCodeAt(pos);
-                if (canHaveSeparators && ch === 95) {
-                    tokenFlags |= 512;
+                if (canHaveSeparators && ch === 95 /* _ */) {
+                    tokenFlags |= 512 /* ContainsSeparator */;
                     if (allowSeparator) {
                         allowSeparator = false;
                         isPreviousTokenSeparator = true;
@@ -6732,14 +6458,14 @@ var ts;
                     continue;
                 }
                 allowSeparator = canHaveSeparators;
-                if (ch >= 48 && ch <= 57) {
-                    value = value * 16 + ch - 48;
+                if (ch >= 48 /* _0 */ && ch <= 57 /* _9 */) {
+                    value = value * 16 + ch - 48 /* _0 */;
                 }
-                else if (ch >= 65 && ch <= 70) {
-                    value = value * 16 + ch - 65 + 10;
+                else if (ch >= 65 /* A */ && ch <= 70 /* F */) {
+                    value = value * 16 + ch - 65 /* A */ + 10;
                 }
-                else if (ch >= 97 && ch <= 102) {
-                    value = value * 16 + ch - 97 + 10;
+                else if (ch >= 97 /* a */ && ch <= 102 /* f */) {
+                    value = value * 16 + ch - 97 /* a */ + 10;
                 }
                 else {
                     break;
@@ -6751,7 +6477,7 @@ var ts;
             if (digits < minCount) {
                 value = -1;
             }
-            if (text.charCodeAt(pos - 1) === 95) {
+            if (text.charCodeAt(pos - 1) === 95 /* _ */) {
                 error(ts.Diagnostics.Numeric_separators_are_not_allowed_here, pos - 1, 1);
             }
             return value;
@@ -6765,7 +6491,7 @@ var ts;
             while (true) {
                 if (pos >= end) {
                     result += text.substring(start, pos);
-                    tokenFlags |= 4;
+                    tokenFlags |= 4 /* Unterminated */;
                     error(ts.Diagnostics.Unterminated_string_literal);
                     break;
                 }
@@ -6775,7 +6501,7 @@ var ts;
                     pos++;
                     break;
                 }
-                if (ch === 92 && !jsxAttributeString) {
+                if (ch === 92 /* backslash */ && !jsxAttributeString) {
                     result += text.substring(start, pos);
                     result += scanEscapeSequence();
                     start = pos;
@@ -6783,7 +6509,7 @@ var ts;
                 }
                 if (isLineBreak(ch) && !jsxAttributeString) {
                     result += text.substring(start, pos);
-                    tokenFlags |= 4;
+                    tokenFlags |= 4 /* Unterminated */;
                     error(ts.Diagnostics.Unterminated_string_literal);
                     break;
                 }
@@ -6791,8 +6517,12 @@ var ts;
             }
             return result;
         }
+        /**
+         * Sets the current 'tokenValue' and returns a NoSubstitutionTemplateLiteral or
+         * a literal component of a TemplateExpression.
+         */
         function scanTemplateAndSetTokenValue() {
-            var startedWithBacktick = text.charCodeAt(pos) === 96;
+            var startedWithBacktick = text.charCodeAt(pos) === 96 /* backtick */;
             pos++;
             var start = pos;
             var contents = "";
@@ -6800,34 +6530,39 @@ var ts;
             while (true) {
                 if (pos >= end) {
                     contents += text.substring(start, pos);
-                    tokenFlags |= 4;
+                    tokenFlags |= 4 /* Unterminated */;
                     error(ts.Diagnostics.Unterminated_template_literal);
-                    resultingToken = startedWithBacktick ? 13 : 16;
+                    resultingToken = startedWithBacktick ? 13 /* NoSubstitutionTemplateLiteral */ : 16 /* TemplateTail */;
                     break;
                 }
                 var currChar = text.charCodeAt(pos);
-                if (currChar === 96) {
+                // '`'
+                if (currChar === 96 /* backtick */) {
                     contents += text.substring(start, pos);
                     pos++;
-                    resultingToken = startedWithBacktick ? 13 : 16;
+                    resultingToken = startedWithBacktick ? 13 /* NoSubstitutionTemplateLiteral */ : 16 /* TemplateTail */;
                     break;
                 }
-                if (currChar === 36 && pos + 1 < end && text.charCodeAt(pos + 1) === 123) {
+                // '${'
+                if (currChar === 36 /* $ */ && pos + 1 < end && text.charCodeAt(pos + 1) === 123 /* openBrace */) {
                     contents += text.substring(start, pos);
                     pos += 2;
-                    resultingToken = startedWithBacktick ? 14 : 15;
+                    resultingToken = startedWithBacktick ? 14 /* TemplateHead */ : 15 /* TemplateMiddle */;
                     break;
                 }
-                if (currChar === 92) {
+                // Escape character
+                if (currChar === 92 /* backslash */) {
                     contents += text.substring(start, pos);
                     contents += scanEscapeSequence();
                     start = pos;
                     continue;
                 }
-                if (currChar === 13) {
+                // Speculated ECMAScript 6 Spec 11.8.6.1:
+                // <CR><LF> and <CR> LineTerminatorSequences are normalized to <LF> for Template Values
+                if (currChar === 13 /* carriageReturn */) {
                     contents += text.substring(start, pos);
                     pos++;
-                    if (pos < end && text.charCodeAt(pos) === 10) {
+                    if (pos < end && text.charCodeAt(pos) === 10 /* lineFeed */) {
                         pos++;
                     }
                     contents += "\n";
@@ -6849,47 +6584,53 @@ var ts;
             var ch = text.charCodeAt(pos);
             pos++;
             switch (ch) {
-                case 48:
+                case 48 /* _0 */:
                     return "\0";
-                case 98:
+                case 98 /* b */:
                     return "\b";
-                case 116:
+                case 116 /* t */:
                     return "\t";
-                case 110:
+                case 110 /* n */:
                     return "\n";
-                case 118:
+                case 118 /* v */:
                     return "\v";
-                case 102:
+                case 102 /* f */:
                     return "\f";
-                case 114:
+                case 114 /* r */:
                     return "\r";
-                case 39:
+                case 39 /* singleQuote */:
                     return "\'";
-                case 34:
+                case 34 /* doubleQuote */:
                     return "\"";
-                case 117:
-                    if (pos < end && text.charCodeAt(pos) === 123) {
-                        tokenFlags |= 8;
+                case 117 /* u */:
+                    // '\u{DDDDDDDD}'
+                    if (pos < end && text.charCodeAt(pos) === 123 /* openBrace */) {
+                        tokenFlags |= 8 /* ExtendedUnicodeEscape */;
                         pos++;
                         return scanExtendedUnicodeEscape();
                     }
-                    return scanHexadecimalEscape(4);
-                case 120:
-                    return scanHexadecimalEscape(2);
-                case 13:
-                    if (pos < end && text.charCodeAt(pos) === 10) {
+                    // '\uDDDD'
+                    return scanHexadecimalEscape(/*numDigits*/ 4);
+                case 120 /* x */:
+                    // '\xDD'
+                    return scanHexadecimalEscape(/*numDigits*/ 2);
+                // when encountering a LineContinuation (i.e. a backslash and a line terminator sequence),
+                // the line terminator is interpreted to be "the empty code unit sequence".
+                case 13 /* carriageReturn */:
+                    if (pos < end && text.charCodeAt(pos) === 10 /* lineFeed */) {
                         pos++;
                     }
-                case 10:
-                case 8232:
-                case 8233:
+                // falls through
+                case 10 /* lineFeed */:
+                case 8232 /* lineSeparator */:
+                case 8233 /* paragraphSeparator */:
                     return "";
                 default:
                     return String.fromCharCode(ch);
             }
         }
         function scanHexadecimalEscape(numDigits) {
-            var escapedValue = scanExactNumberOfHexDigits(numDigits, false);
+            var escapedValue = scanExactNumberOfHexDigits(numDigits, /*canHaveSeparators*/ false);
             if (escapedValue >= 0) {
                 return String.fromCharCode(escapedValue);
             }
@@ -6899,8 +6640,9 @@ var ts;
             }
         }
         function scanExtendedUnicodeEscape() {
-            var escapedValue = scanMinimumNumberOfHexDigits(1, false);
+            var escapedValue = scanMinimumNumberOfHexDigits(1, /*canHaveSeparators*/ false);
             var isInvalidExtendedEscape = false;
+            // Validate the value of the digit
             if (escapedValue < 0) {
                 error(ts.Diagnostics.Hexadecimal_digit_expected);
                 isInvalidExtendedEscape = true;
@@ -6913,7 +6655,8 @@ var ts;
                 error(ts.Diagnostics.Unexpected_end_of_text);
                 isInvalidExtendedEscape = true;
             }
-            else if (text.charCodeAt(pos) === 125) {
+            else if (text.charCodeAt(pos) === 125 /* closeBrace */) {
+                // Only swallow the following character up if it's a '}'.
                 pos++;
             }
             else {
@@ -6925,6 +6668,7 @@ var ts;
             }
             return utf16EncodeAsString(escapedValue);
         }
+        // Derived from the 10.1.1 UTF16Encoding of the ES6 Spec.
         function utf16EncodeAsString(codePoint) {
             ts.Debug.assert(0x0 <= codePoint && codePoint <= 0x10FFFF);
             if (codePoint <= 65535) {
@@ -6934,11 +6678,13 @@ var ts;
             var codeUnit2 = ((codePoint - 65536) % 1024) + 0xDC00;
             return String.fromCharCode(codeUnit1, codeUnit2);
         }
+        // Current character is known to be a backslash. Check for Unicode escape of the form '\uXXXX'
+        // and return code point value if valid Unicode escape is found. Otherwise return -1.
         function peekUnicodeEscape() {
-            if (pos + 5 < end && text.charCodeAt(pos + 1) === 117) {
+            if (pos + 5 < end && text.charCodeAt(pos + 1) === 117 /* u */) {
                 var start_1 = pos;
                 pos += 2;
-                var value = scanExactNumberOfHexDigits(4, false);
+                var value = scanExactNumberOfHexDigits(4, /*canHaveSeparators*/ false);
                 pos = start_1;
                 return value;
             }
@@ -6952,13 +6698,14 @@ var ts;
                 if (isIdentifierPart(ch, languageVersion)) {
                     pos++;
                 }
-                else if (ch === 92) {
+                else if (ch === 92 /* backslash */) {
                     ch = peekUnicodeEscape();
                     if (!(ch >= 0 && isIdentifierPart(ch, languageVersion))) {
                         break;
                     }
                     result += text.substring(start, pos);
                     result += String.fromCharCode(ch);
+                    // Valid Unicode escape is always six characters
                     pos += 6;
                     start = pos;
                 }
@@ -6970,28 +6717,32 @@ var ts;
             return result;
         }
         function getIdentifierToken() {
+            // Reserved words are between 2 and 11 characters long and start with a lowercase letter
             var len = tokenValue.length;
             if (len >= 2 && len <= 11) {
                 var ch = tokenValue.charCodeAt(0);
-                if (ch >= 97 && ch <= 122) {
+                if (ch >= 97 /* a */ && ch <= 122 /* z */) {
                     token = textToToken.get(tokenValue);
                     if (token !== undefined) {
                         return token;
                     }
                 }
             }
-            return token = 71;
+            return token = 71 /* Identifier */;
         }
         function scanBinaryOrOctalDigits(base) {
             ts.Debug.assert(base === 2 || base === 8, "Expected either base 2 or base 8");
             var value = 0;
+            // For counting number of digits; Valid binaryIntegerLiteral must have at least one binary digit following B or b.
+            // Similarly valid octalIntegerLiteral must have at least one octal digit following o or O.
             var numberOfDigits = 0;
             var separatorAllowed = false;
             var isPreviousTokenSeparator = false;
             while (true) {
                 var ch = text.charCodeAt(pos);
-                if (ch === 95) {
-                    tokenFlags |= 512;
+                // Numeric separators are allowed anywhere within a numeric literal, except not at the beginning, or following another separator
+                if (ch === 95 /* _ */) {
+                    tokenFlags |= 512 /* ContainsSeparator */;
                     if (separatorAllowed) {
                         separatorAllowed = false;
                         isPreviousTokenSeparator = true;
@@ -7006,7 +6757,7 @@ var ts;
                     continue;
                 }
                 separatorAllowed = true;
-                var valueOfCh = ch - 48;
+                var valueOfCh = ch - 48 /* _0 */;
                 if (!isDigit(ch) || valueOfCh >= base) {
                     break;
                 }
@@ -7015,10 +6766,12 @@ var ts;
                 numberOfDigits++;
                 isPreviousTokenSeparator = false;
             }
+            // Invalid binaryIntegerLiteral or octalIntegerLiteral
             if (numberOfDigits === 0) {
                 return -1;
             }
-            if (text.charCodeAt(pos - 1) === 95) {
+            if (text.charCodeAt(pos - 1) === 95 /* _ */) {
+                // Literal ends with underscore - not allowed
                 error(ts.Diagnostics.Numeric_separators_are_not_allowed_here, pos - 1, 1);
                 return value;
             }
@@ -7030,39 +6783,41 @@ var ts;
             while (true) {
                 tokenPos = pos;
                 if (pos >= end) {
-                    return token = 1;
+                    return token = 1 /* EndOfFileToken */;
                 }
                 var ch = text.charCodeAt(pos);
-                if (ch === 35 && pos === 0 && isShebangTrivia(text, pos)) {
+                // Special handling for shebang
+                if (ch === 35 /* hash */ && pos === 0 && isShebangTrivia(text, pos)) {
                     pos = scanShebangTrivia(text, pos);
                     if (skipTrivia) {
                         continue;
                     }
                     else {
-                        return token = 6;
+                        return token = 6 /* ShebangTrivia */;
                     }
                 }
                 switch (ch) {
-                    case 10:
-                    case 13:
-                        tokenFlags |= 1;
+                    case 10 /* lineFeed */:
+                    case 13 /* carriageReturn */:
+                        tokenFlags |= 1 /* PrecedingLineBreak */;
                         if (skipTrivia) {
                             pos++;
                             continue;
                         }
                         else {
-                            if (ch === 13 && pos + 1 < end && text.charCodeAt(pos + 1) === 10) {
+                            if (ch === 13 /* carriageReturn */ && pos + 1 < end && text.charCodeAt(pos + 1) === 10 /* lineFeed */) {
+                                // consume both CR and LF
                                 pos += 2;
                             }
                             else {
                                 pos++;
                             }
-                            return token = 4;
+                            return token = 4 /* NewLineTrivia */;
                         }
-                    case 9:
-                    case 11:
-                    case 12:
-                    case 32:
+                    case 9 /* tab */:
+                    case 11 /* verticalTab */:
+                    case 12 /* formFeed */:
+                    case 32 /* space */:
                         if (skipTrivia) {
                             pos++;
                             continue;
@@ -7071,89 +6826,90 @@ var ts;
                             while (pos < end && isWhiteSpaceSingleLine(text.charCodeAt(pos))) {
                                 pos++;
                             }
-                            return token = 5;
+                            return token = 5 /* WhitespaceTrivia */;
                         }
-                    case 33:
-                        if (text.charCodeAt(pos + 1) === 61) {
-                            if (text.charCodeAt(pos + 2) === 61) {
-                                return pos += 3, token = 35;
+                    case 33 /* exclamation */:
+                        if (text.charCodeAt(pos + 1) === 61 /* equals */) {
+                            if (text.charCodeAt(pos + 2) === 61 /* equals */) {
+                                return pos += 3, token = 35 /* ExclamationEqualsEqualsToken */;
                             }
-                            return pos += 2, token = 33;
+                            return pos += 2, token = 33 /* ExclamationEqualsToken */;
                         }
                         pos++;
-                        return token = 51;
-                    case 34:
-                    case 39:
+                        return token = 51 /* ExclamationToken */;
+                    case 34 /* doubleQuote */:
+                    case 39 /* singleQuote */:
                         tokenValue = scanString();
-                        return token = 9;
-                    case 96:
+                        return token = 9 /* StringLiteral */;
+                    case 96 /* backtick */:
                         return token = scanTemplateAndSetTokenValue();
-                    case 37:
-                        if (text.charCodeAt(pos + 1) === 61) {
-                            return pos += 2, token = 64;
+                    case 37 /* percent */:
+                        if (text.charCodeAt(pos + 1) === 61 /* equals */) {
+                            return pos += 2, token = 64 /* PercentEqualsToken */;
                         }
                         pos++;
-                        return token = 42;
-                    case 38:
-                        if (text.charCodeAt(pos + 1) === 38) {
-                            return pos += 2, token = 53;
+                        return token = 42 /* PercentToken */;
+                    case 38 /* ampersand */:
+                        if (text.charCodeAt(pos + 1) === 38 /* ampersand */) {
+                            return pos += 2, token = 53 /* AmpersandAmpersandToken */;
                         }
-                        if (text.charCodeAt(pos + 1) === 61) {
-                            return pos += 2, token = 68;
+                        if (text.charCodeAt(pos + 1) === 61 /* equals */) {
+                            return pos += 2, token = 68 /* AmpersandEqualsToken */;
                         }
                         pos++;
-                        return token = 48;
-                    case 40:
+                        return token = 48 /* AmpersandToken */;
+                    case 40 /* openParen */:
                         pos++;
-                        return token = 19;
-                    case 41:
+                        return token = 19 /* OpenParenToken */;
+                    case 41 /* closeParen */:
                         pos++;
-                        return token = 20;
-                    case 42:
-                        if (text.charCodeAt(pos + 1) === 61) {
-                            return pos += 2, token = 61;
+                        return token = 20 /* CloseParenToken */;
+                    case 42 /* asterisk */:
+                        if (text.charCodeAt(pos + 1) === 61 /* equals */) {
+                            return pos += 2, token = 61 /* AsteriskEqualsToken */;
                         }
-                        if (text.charCodeAt(pos + 1) === 42) {
-                            if (text.charCodeAt(pos + 2) === 61) {
-                                return pos += 3, token = 62;
+                        if (text.charCodeAt(pos + 1) === 42 /* asterisk */) {
+                            if (text.charCodeAt(pos + 2) === 61 /* equals */) {
+                                return pos += 3, token = 62 /* AsteriskAsteriskEqualsToken */;
                             }
-                            return pos += 2, token = 40;
+                            return pos += 2, token = 40 /* AsteriskAsteriskToken */;
                         }
                         pos++;
-                        return token = 39;
-                    case 43:
-                        if (text.charCodeAt(pos + 1) === 43) {
-                            return pos += 2, token = 43;
+                        return token = 39 /* AsteriskToken */;
+                    case 43 /* plus */:
+                        if (text.charCodeAt(pos + 1) === 43 /* plus */) {
+                            return pos += 2, token = 43 /* PlusPlusToken */;
                         }
-                        if (text.charCodeAt(pos + 1) === 61) {
-                            return pos += 2, token = 59;
+                        if (text.charCodeAt(pos + 1) === 61 /* equals */) {
+                            return pos += 2, token = 59 /* PlusEqualsToken */;
                         }
                         pos++;
-                        return token = 37;
-                    case 44:
+                        return token = 37 /* PlusToken */;
+                    case 44 /* comma */:
                         pos++;
-                        return token = 26;
-                    case 45:
-                        if (text.charCodeAt(pos + 1) === 45) {
-                            return pos += 2, token = 44;
+                        return token = 26 /* CommaToken */;
+                    case 45 /* minus */:
+                        if (text.charCodeAt(pos + 1) === 45 /* minus */) {
+                            return pos += 2, token = 44 /* MinusMinusToken */;
                         }
-                        if (text.charCodeAt(pos + 1) === 61) {
-                            return pos += 2, token = 60;
+                        if (text.charCodeAt(pos + 1) === 61 /* equals */) {
+                            return pos += 2, token = 60 /* MinusEqualsToken */;
                         }
                         pos++;
-                        return token = 38;
-                    case 46:
+                        return token = 38 /* MinusToken */;
+                    case 46 /* dot */:
                         if (isDigit(text.charCodeAt(pos + 1))) {
                             tokenValue = scanNumber();
-                            return token = 8;
+                            return token = 8 /* NumericLiteral */;
                         }
-                        if (text.charCodeAt(pos + 1) === 46 && text.charCodeAt(pos + 2) === 46) {
-                            return pos += 3, token = 24;
+                        if (text.charCodeAt(pos + 1) === 46 /* dot */ && text.charCodeAt(pos + 2) === 46 /* dot */) {
+                            return pos += 3, token = 24 /* DotDotDotToken */;
                         }
                         pos++;
-                        return token = 23;
-                    case 47:
-                        if (text.charCodeAt(pos + 1) === 47) {
+                        return token = 23 /* DotToken */;
+                    case 47 /* slash */:
+                        // Single-line comment
+                        if (text.charCodeAt(pos + 1) === 47 /* slash */) {
                             pos += 2;
                             while (pos < end) {
                                 if (isLineBreak(text.charCodeAt(pos))) {
@@ -7165,24 +6921,25 @@ var ts;
                                 continue;
                             }
                             else {
-                                return token = 2;
+                                return token = 2 /* SingleLineCommentTrivia */;
                             }
                         }
-                        if (text.charCodeAt(pos + 1) === 42) {
+                        // Multi-line comment
+                        if (text.charCodeAt(pos + 1) === 42 /* asterisk */) {
                             pos += 2;
-                            if (text.charCodeAt(pos) === 42 && text.charCodeAt(pos + 1) !== 47) {
-                                tokenFlags |= 2;
+                            if (text.charCodeAt(pos) === 42 /* asterisk */ && text.charCodeAt(pos + 1) !== 47 /* slash */) {
+                                tokenFlags |= 2 /* PrecedingJSDocComment */;
                             }
                             var commentClosed = false;
                             while (pos < end) {
                                 var ch_1 = text.charCodeAt(pos);
-                                if (ch_1 === 42 && text.charCodeAt(pos + 1) === 47) {
+                                if (ch_1 === 42 /* asterisk */ && text.charCodeAt(pos + 1) === 47 /* slash */) {
                                     pos += 2;
                                     commentClosed = true;
                                     break;
                                 }
                                 if (isLineBreak(ch_1)) {
-                                    tokenFlags |= 1;
+                                    tokenFlags |= 1 /* PrecedingLineBreak */;
                                 }
                                 pos++;
                             }
@@ -7194,177 +6951,182 @@ var ts;
                             }
                             else {
                                 if (!commentClosed) {
-                                    tokenFlags |= 4;
+                                    tokenFlags |= 4 /* Unterminated */;
                                 }
-                                return token = 3;
+                                return token = 3 /* MultiLineCommentTrivia */;
                             }
                         }
-                        if (text.charCodeAt(pos + 1) === 61) {
-                            return pos += 2, token = 63;
+                        if (text.charCodeAt(pos + 1) === 61 /* equals */) {
+                            return pos += 2, token = 63 /* SlashEqualsToken */;
                         }
                         pos++;
-                        return token = 41;
-                    case 48:
-                        if (pos + 2 < end && (text.charCodeAt(pos + 1) === 88 || text.charCodeAt(pos + 1) === 120)) {
+                        return token = 41 /* SlashToken */;
+                    case 48 /* _0 */:
+                        if (pos + 2 < end && (text.charCodeAt(pos + 1) === 88 /* X */ || text.charCodeAt(pos + 1) === 120 /* x */)) {
                             pos += 2;
-                            var value = scanMinimumNumberOfHexDigits(1, true);
+                            var value = scanMinimumNumberOfHexDigits(1, /*canHaveSeparators*/ true);
                             if (value < 0) {
                                 error(ts.Diagnostics.Hexadecimal_digit_expected);
                                 value = 0;
                             }
                             tokenValue = "" + value;
-                            tokenFlags |= 64;
-                            return token = 8;
+                            tokenFlags |= 64 /* HexSpecifier */;
+                            return token = 8 /* NumericLiteral */;
                         }
-                        else if (pos + 2 < end && (text.charCodeAt(pos + 1) === 66 || text.charCodeAt(pos + 1) === 98)) {
+                        else if (pos + 2 < end && (text.charCodeAt(pos + 1) === 66 /* B */ || text.charCodeAt(pos + 1) === 98 /* b */)) {
                             pos += 2;
-                            var value = scanBinaryOrOctalDigits(2);
+                            var value = scanBinaryOrOctalDigits(/* base */ 2);
                             if (value < 0) {
                                 error(ts.Diagnostics.Binary_digit_expected);
                                 value = 0;
                             }
                             tokenValue = "" + value;
-                            tokenFlags |= 128;
-                            return token = 8;
+                            tokenFlags |= 128 /* BinarySpecifier */;
+                            return token = 8 /* NumericLiteral */;
                         }
-                        else if (pos + 2 < end && (text.charCodeAt(pos + 1) === 79 || text.charCodeAt(pos + 1) === 111)) {
+                        else if (pos + 2 < end && (text.charCodeAt(pos + 1) === 79 /* O */ || text.charCodeAt(pos + 1) === 111 /* o */)) {
                             pos += 2;
-                            var value = scanBinaryOrOctalDigits(8);
+                            var value = scanBinaryOrOctalDigits(/* base */ 8);
                             if (value < 0) {
                                 error(ts.Diagnostics.Octal_digit_expected);
                                 value = 0;
                             }
                             tokenValue = "" + value;
-                            tokenFlags |= 256;
-                            return token = 8;
+                            tokenFlags |= 256 /* OctalSpecifier */;
+                            return token = 8 /* NumericLiteral */;
                         }
+                        // Try to parse as an octal
                         if (pos + 1 < end && isOctalDigit(text.charCodeAt(pos + 1))) {
                             tokenValue = "" + scanOctalDigits();
-                            tokenFlags |= 32;
-                            return token = 8;
+                            tokenFlags |= 32 /* Octal */;
+                            return token = 8 /* NumericLiteral */;
                         }
-                    case 49:
-                    case 50:
-                    case 51:
-                    case 52:
-                    case 53:
-                    case 54:
-                    case 55:
-                    case 56:
-                    case 57:
+                    // This fall-through is a deviation from the EcmaScript grammar. The grammar says that a leading zero
+                    // can only be followed by an octal digit, a dot, or the end of the number literal. However, we are being
+                    // permissive and allowing decimal digits of the form 08* and 09* (which many browsers also do).
+                    // falls through
+                    case 49 /* _1 */:
+                    case 50 /* _2 */:
+                    case 51 /* _3 */:
+                    case 52 /* _4 */:
+                    case 53 /* _5 */:
+                    case 54 /* _6 */:
+                    case 55 /* _7 */:
+                    case 56 /* _8 */:
+                    case 57 /* _9 */:
                         tokenValue = scanNumber();
-                        return token = 8;
-                    case 58:
+                        return token = 8 /* NumericLiteral */;
+                    case 58 /* colon */:
                         pos++;
-                        return token = 56;
-                    case 59:
+                        return token = 56 /* ColonToken */;
+                    case 59 /* semicolon */:
                         pos++;
-                        return token = 25;
-                    case 60:
+                        return token = 25 /* SemicolonToken */;
+                    case 60 /* lessThan */:
                         if (isConflictMarkerTrivia(text, pos)) {
                             pos = scanConflictMarkerTrivia(text, pos, error);
                             if (skipTrivia) {
                                 continue;
                             }
                             else {
-                                return token = 7;
+                                return token = 7 /* ConflictMarkerTrivia */;
                             }
                         }
-                        if (text.charCodeAt(pos + 1) === 60) {
-                            if (text.charCodeAt(pos + 2) === 61) {
-                                return pos += 3, token = 65;
+                        if (text.charCodeAt(pos + 1) === 60 /* lessThan */) {
+                            if (text.charCodeAt(pos + 2) === 61 /* equals */) {
+                                return pos += 3, token = 65 /* LessThanLessThanEqualsToken */;
                             }
-                            return pos += 2, token = 45;
+                            return pos += 2, token = 45 /* LessThanLessThanToken */;
                         }
-                        if (text.charCodeAt(pos + 1) === 61) {
-                            return pos += 2, token = 30;
+                        if (text.charCodeAt(pos + 1) === 61 /* equals */) {
+                            return pos += 2, token = 30 /* LessThanEqualsToken */;
                         }
-                        if (languageVariant === 1 &&
-                            text.charCodeAt(pos + 1) === 47 &&
-                            text.charCodeAt(pos + 2) !== 42) {
-                            return pos += 2, token = 28;
+                        if (languageVariant === 1 /* JSX */ &&
+                            text.charCodeAt(pos + 1) === 47 /* slash */ &&
+                            text.charCodeAt(pos + 2) !== 42 /* asterisk */) {
+                            return pos += 2, token = 28 /* LessThanSlashToken */;
                         }
                         pos++;
-                        return token = 27;
-                    case 61:
+                        return token = 27 /* LessThanToken */;
+                    case 61 /* equals */:
                         if (isConflictMarkerTrivia(text, pos)) {
                             pos = scanConflictMarkerTrivia(text, pos, error);
                             if (skipTrivia) {
                                 continue;
                             }
                             else {
-                                return token = 7;
+                                return token = 7 /* ConflictMarkerTrivia */;
                             }
                         }
-                        if (text.charCodeAt(pos + 1) === 61) {
-                            if (text.charCodeAt(pos + 2) === 61) {
-                                return pos += 3, token = 34;
+                        if (text.charCodeAt(pos + 1) === 61 /* equals */) {
+                            if (text.charCodeAt(pos + 2) === 61 /* equals */) {
+                                return pos += 3, token = 34 /* EqualsEqualsEqualsToken */;
                             }
-                            return pos += 2, token = 32;
+                            return pos += 2, token = 32 /* EqualsEqualsToken */;
                         }
-                        if (text.charCodeAt(pos + 1) === 62) {
-                            return pos += 2, token = 36;
+                        if (text.charCodeAt(pos + 1) === 62 /* greaterThan */) {
+                            return pos += 2, token = 36 /* EqualsGreaterThanToken */;
                         }
                         pos++;
-                        return token = 58;
-                    case 62:
+                        return token = 58 /* EqualsToken */;
+                    case 62 /* greaterThan */:
                         if (isConflictMarkerTrivia(text, pos)) {
                             pos = scanConflictMarkerTrivia(text, pos, error);
                             if (skipTrivia) {
                                 continue;
                             }
                             else {
-                                return token = 7;
+                                return token = 7 /* ConflictMarkerTrivia */;
                             }
                         }
                         pos++;
-                        return token = 29;
-                    case 63:
+                        return token = 29 /* GreaterThanToken */;
+                    case 63 /* question */:
                         pos++;
-                        return token = 55;
-                    case 91:
+                        return token = 55 /* QuestionToken */;
+                    case 91 /* openBracket */:
                         pos++;
-                        return token = 21;
-                    case 93:
+                        return token = 21 /* OpenBracketToken */;
+                    case 93 /* closeBracket */:
                         pos++;
-                        return token = 22;
-                    case 94:
-                        if (text.charCodeAt(pos + 1) === 61) {
-                            return pos += 2, token = 70;
+                        return token = 22 /* CloseBracketToken */;
+                    case 94 /* caret */:
+                        if (text.charCodeAt(pos + 1) === 61 /* equals */) {
+                            return pos += 2, token = 70 /* CaretEqualsToken */;
                         }
                         pos++;
-                        return token = 50;
-                    case 123:
+                        return token = 50 /* CaretToken */;
+                    case 123 /* openBrace */:
                         pos++;
-                        return token = 17;
-                    case 124:
+                        return token = 17 /* OpenBraceToken */;
+                    case 124 /* bar */:
                         if (isConflictMarkerTrivia(text, pos)) {
                             pos = scanConflictMarkerTrivia(text, pos, error);
                             if (skipTrivia) {
                                 continue;
                             }
                             else {
-                                return token = 7;
+                                return token = 7 /* ConflictMarkerTrivia */;
                             }
                         }
-                        if (text.charCodeAt(pos + 1) === 124) {
-                            return pos += 2, token = 54;
+                        if (text.charCodeAt(pos + 1) === 124 /* bar */) {
+                            return pos += 2, token = 54 /* BarBarToken */;
                         }
-                        if (text.charCodeAt(pos + 1) === 61) {
-                            return pos += 2, token = 69;
+                        if (text.charCodeAt(pos + 1) === 61 /* equals */) {
+                            return pos += 2, token = 69 /* BarEqualsToken */;
                         }
                         pos++;
-                        return token = 49;
-                    case 125:
+                        return token = 49 /* BarToken */;
+                    case 125 /* closeBrace */:
                         pos++;
-                        return token = 18;
-                    case 126:
+                        return token = 18 /* CloseBraceToken */;
+                    case 126 /* tilde */:
                         pos++;
-                        return token = 52;
-                    case 64:
+                        return token = 52 /* TildeToken */;
+                    case 64 /* at */:
                         pos++;
-                        return token = 57;
-                    case 92:
+                        return token = 57 /* AtToken */;
+                    case 92 /* backslash */:
                         var cookedChar = peekUnicodeEscape();
                         if (cookedChar >= 0 && isIdentifierStart(cookedChar, languageVersion)) {
                             pos += 6;
@@ -7373,14 +7135,14 @@ var ts;
                         }
                         error(ts.Diagnostics.Invalid_character);
                         pos++;
-                        return token = 0;
+                        return token = 0 /* Unknown */;
                     default:
                         if (isIdentifierStart(ch, languageVersion)) {
                             pos++;
                             while (pos < end && isIdentifierPart(ch = text.charCodeAt(pos), languageVersion))
                                 pos++;
                             tokenValue = text.substring(tokenPos, pos);
-                            if (ch === 92) {
+                            if (ch === 92 /* backslash */) {
                                 tokenValue += scanIdentifierParts();
                             }
                             return token = getIdentifierToken();
@@ -7390,69 +7152,75 @@ var ts;
                             continue;
                         }
                         else if (isLineBreak(ch)) {
-                            tokenFlags |= 1;
+                            tokenFlags |= 1 /* PrecedingLineBreak */;
                             pos++;
                             continue;
                         }
                         error(ts.Diagnostics.Invalid_character);
                         pos++;
-                        return token = 0;
+                        return token = 0 /* Unknown */;
                 }
             }
         }
         function reScanGreaterToken() {
-            if (token === 29) {
-                if (text.charCodeAt(pos) === 62) {
-                    if (text.charCodeAt(pos + 1) === 62) {
-                        if (text.charCodeAt(pos + 2) === 61) {
-                            return pos += 3, token = 67;
+            if (token === 29 /* GreaterThanToken */) {
+                if (text.charCodeAt(pos) === 62 /* greaterThan */) {
+                    if (text.charCodeAt(pos + 1) === 62 /* greaterThan */) {
+                        if (text.charCodeAt(pos + 2) === 61 /* equals */) {
+                            return pos += 3, token = 67 /* GreaterThanGreaterThanGreaterThanEqualsToken */;
                         }
-                        return pos += 2, token = 47;
+                        return pos += 2, token = 47 /* GreaterThanGreaterThanGreaterThanToken */;
                     }
-                    if (text.charCodeAt(pos + 1) === 61) {
-                        return pos += 2, token = 66;
+                    if (text.charCodeAt(pos + 1) === 61 /* equals */) {
+                        return pos += 2, token = 66 /* GreaterThanGreaterThanEqualsToken */;
                     }
                     pos++;
-                    return token = 46;
+                    return token = 46 /* GreaterThanGreaterThanToken */;
                 }
-                if (text.charCodeAt(pos) === 61) {
+                if (text.charCodeAt(pos) === 61 /* equals */) {
                     pos++;
-                    return token = 31;
+                    return token = 31 /* GreaterThanEqualsToken */;
                 }
             }
             return token;
         }
         function reScanSlashToken() {
-            if (token === 41 || token === 63) {
+            if (token === 41 /* SlashToken */ || token === 63 /* SlashEqualsToken */) {
                 var p = tokenPos + 1;
                 var inEscape = false;
                 var inCharacterClass = false;
                 while (true) {
+                    // If we reach the end of a file, or hit a newline, then this is an unterminated
+                    // regex.  Report error and return what we have so far.
                     if (p >= end) {
-                        tokenFlags |= 4;
+                        tokenFlags |= 4 /* Unterminated */;
                         error(ts.Diagnostics.Unterminated_regular_expression_literal);
                         break;
                     }
                     var ch = text.charCodeAt(p);
                     if (isLineBreak(ch)) {
-                        tokenFlags |= 4;
+                        tokenFlags |= 4 /* Unterminated */;
                         error(ts.Diagnostics.Unterminated_regular_expression_literal);
                         break;
                     }
                     if (inEscape) {
+                        // Parsing an escape character;
+                        // reset the flag and just advance to the next char.
                         inEscape = false;
                     }
-                    else if (ch === 47 && !inCharacterClass) {
+                    else if (ch === 47 /* slash */ && !inCharacterClass) {
+                        // A slash within a character class is permissible,
+                        // but in general it signals the end of the regexp literal.
                         p++;
                         break;
                     }
-                    else if (ch === 91) {
+                    else if (ch === 91 /* openBracket */) {
                         inCharacterClass = true;
                     }
-                    else if (ch === 92) {
+                    else if (ch === 92 /* backslash */) {
                         inEscape = true;
                     }
-                    else if (ch === 93) {
+                    else if (ch === 93 /* closeBracket */) {
                         inCharacterClass = false;
                     }
                     p++;
@@ -7462,12 +7230,15 @@ var ts;
                 }
                 pos = p;
                 tokenValue = text.substring(tokenPos, pos);
-                token = 12;
+                token = 12 /* RegularExpressionLiteral */;
             }
             return token;
         }
+        /**
+         * Unconditionally back up and scan a template expression portion.
+         */
         function reScanTemplateToken() {
-            ts.Debug.assert(token === 18, "'reScanTemplateToken' should only be called on a '}'");
+            ts.Debug.assert(token === 18 /* CloseBraceToken */, "'reScanTemplateToken' should only be called on a '}'");
             pos = tokenPos;
             return token = scanTemplateAndSetTokenValue();
         }
@@ -7478,34 +7249,43 @@ var ts;
         function scanJsxToken() {
             startPos = tokenPos = pos;
             if (pos >= end) {
-                return token = 1;
+                return token = 1 /* EndOfFileToken */;
             }
             var char = text.charCodeAt(pos);
-            if (char === 60) {
-                if (text.charCodeAt(pos + 1) === 47) {
+            if (char === 60 /* lessThan */) {
+                if (text.charCodeAt(pos + 1) === 47 /* slash */) {
                     pos += 2;
-                    return token = 28;
+                    return token = 28 /* LessThanSlashToken */;
                 }
                 pos++;
-                return token = 27;
+                return token = 27 /* LessThanToken */;
             }
-            if (char === 123) {
+            if (char === 123 /* openBrace */) {
                 pos++;
-                return token = 17;
+                return token = 17 /* OpenBraceToken */;
             }
+            // First non-whitespace character on this line.
             var firstNonWhitespace = 0;
+            // These initial values are special because the first line is:
+            // firstNonWhitespace = 0 to indicate that we want leading whitspace,
             while (pos < end) {
                 char = text.charCodeAt(pos);
-                if (char === 123) {
+                if (char === 123 /* openBrace */) {
                     break;
                 }
-                if (char === 60) {
+                if (char === 60 /* lessThan */) {
                     if (isConflictMarkerTrivia(text, pos)) {
                         pos = scanConflictMarkerTrivia(text, pos, error);
-                        return token = 7;
+                        return token = 7 /* ConflictMarkerTrivia */;
                     }
                     break;
                 }
+                // FirstNonWhitespace is 0, then we only see whitespaces so far. If we see a linebreak, we want to ignore that whitespaces.
+                // i.e (- : whitespace)
+                //      <div>----
+                //      </div> becomes <div></div>
+                //
+                //      <div>----</div> becomes <div>----</div>
                 if (isLineBreak(char) && firstNonWhitespace === 0) {
                     firstNonWhitespace = -1;
                 }
@@ -7514,14 +7294,16 @@ var ts;
                 }
                 pos++;
             }
-            return firstNonWhitespace === -1 ? 11 : 10;
+            return firstNonWhitespace === -1 ? 11 /* JsxTextAllWhiteSpaces */ : 10 /* JsxText */;
         }
+        // Scans a JSX identifier; these differ from normal identifiers in that
+        // they allow dashes
         function scanJsxIdentifier() {
             if (tokenIsIdentifierOrKeyword(token)) {
                 var firstCharPosition = pos;
                 while (pos < end) {
                     var ch = text.charCodeAt(pos);
-                    if (ch === 45 || ((firstCharPosition === pos) ? isIdentifierStart(ch, languageVersion) : isIdentifierPart(ch, languageVersion))) {
+                    if (ch === 45 /* minus */ || ((firstCharPosition === pos) ? isIdentifierStart(ch, languageVersion) : isIdentifierPart(ch, languageVersion))) {
                         pos++;
                     }
                     else {
@@ -7535,70 +7317,71 @@ var ts;
         function scanJsxAttributeValue() {
             startPos = pos;
             switch (text.charCodeAt(pos)) {
-                case 34:
-                case 39:
-                    tokenValue = scanString(true);
-                    return token = 9;
+                case 34 /* doubleQuote */:
+                case 39 /* singleQuote */:
+                    tokenValue = scanString(/*jsxAttributeString*/ true);
+                    return token = 9 /* StringLiteral */;
                 default:
+                    // If this scans anything other than `{`, it's a parse error.
                     return scan();
             }
         }
         function scanJSDocToken() {
             startPos = tokenPos = pos;
             if (pos >= end) {
-                return token = 1;
+                return token = 1 /* EndOfFileToken */;
             }
             var ch = text.charCodeAt(pos);
             pos++;
             switch (ch) {
-                case 9:
-                case 11:
-                case 12:
-                case 32:
+                case 9 /* tab */:
+                case 11 /* verticalTab */:
+                case 12 /* formFeed */:
+                case 32 /* space */:
                     while (pos < end && isWhiteSpaceSingleLine(text.charCodeAt(pos))) {
                         pos++;
                     }
-                    return token = 5;
-                case 64:
-                    return token = 57;
-                case 10:
-                case 13:
-                    return token = 4;
-                case 42:
-                    return token = 39;
-                case 123:
-                    return token = 17;
-                case 125:
-                    return token = 18;
-                case 91:
-                    return token = 21;
-                case 93:
-                    return token = 22;
-                case 60:
-                    return token = 27;
-                case 61:
-                    return token = 58;
-                case 44:
-                    return token = 26;
-                case 46:
-                    return token = 23;
-                case 96:
-                    while (pos < end && text.charCodeAt(pos) !== 96) {
+                    return token = 5 /* WhitespaceTrivia */;
+                case 64 /* at */:
+                    return token = 57 /* AtToken */;
+                case 10 /* lineFeed */:
+                case 13 /* carriageReturn */:
+                    return token = 4 /* NewLineTrivia */;
+                case 42 /* asterisk */:
+                    return token = 39 /* AsteriskToken */;
+                case 123 /* openBrace */:
+                    return token = 17 /* OpenBraceToken */;
+                case 125 /* closeBrace */:
+                    return token = 18 /* CloseBraceToken */;
+                case 91 /* openBracket */:
+                    return token = 21 /* OpenBracketToken */;
+                case 93 /* closeBracket */:
+                    return token = 22 /* CloseBracketToken */;
+                case 60 /* lessThan */:
+                    return token = 27 /* LessThanToken */;
+                case 61 /* equals */:
+                    return token = 58 /* EqualsToken */;
+                case 44 /* comma */:
+                    return token = 26 /* CommaToken */;
+                case 46 /* dot */:
+                    return token = 23 /* DotToken */;
+                case 96 /* backtick */:
+                    while (pos < end && text.charCodeAt(pos) !== 96 /* backtick */) {
                         pos++;
                     }
                     tokenValue = text.substring(tokenPos + 1, pos);
                     pos++;
-                    return token = 13;
+                    return token = 13 /* NoSubstitutionTemplateLiteral */;
             }
-            if (isIdentifierStart(ch, 6)) {
-                while (isIdentifierPart(text.charCodeAt(pos), 6) && pos < end) {
+            if (isIdentifierStart(ch, 6 /* Latest */)) {
+                while (isIdentifierPart(text.charCodeAt(pos), 6 /* Latest */) && pos < end) {
                     pos++;
                 }
                 tokenValue = text.substring(tokenPos, pos);
-                return token = 71;
+                return token = 71 /* Identifier */;
             }
             else {
-                return token = 0;
+                return token = 0 /* Unknown */;
             }
         }
         function speculationHelper(callback, isLookahead) {
@@ -7609,6 +7392,8 @@ var ts;
             var saveTokenValue = tokenValue;
             var saveTokenFlags = tokenFlags;
             var result = callback();
+            // If our callback returned something 'falsy' or we're just looking ahead,
+            // then unconditionally restore us to where we were.
             if (!result || isLookahead) {
                 pos = savePos;
                 startPos = saveStartPos;
@@ -7639,10 +7424,10 @@ var ts;
             return result;
         }
         function lookAhead(callback) {
-            return speculationHelper(callback, true);
+            return speculationHelper(callback, /*isLookahead*/ true);
         }
         function tryScan(callback) {
-            return speculationHelper(callback, false);
+            return speculationHelper(callback, /*isLookahead*/ false);
         }
         function getText() {
             return text;
@@ -7666,14 +7451,45 @@ var ts;
             pos = textPos;
             startPos = textPos;
             tokenPos = textPos;
-            token = 0;
+            token = 0 /* Unknown */;
             tokenValue = undefined;
             tokenFlags = 0;
         }
     }
     ts.createScanner = createScanner;
 })(ts || (ts = {}));
+/** Non-internal stuff goes here */
 var ts;
+(function (ts) {
+    ts.emptyArray = [];
+    function closeFileWatcher(watcher) {
+        watcher.close();
+    }
+    ts.closeFileWatcher = closeFileWatcher;
+    function isExternalModuleNameRelative(moduleName) {
+        // TypeScript 1.0 spec (April 2014): 11.2.1
+        // An external module name is "relative" if the first term is "." or "..".
+        // Update: We also consider a path like `C:\foo.ts` "relative" because we do not search for it in `node_modules` or treat it as an ambient module.
+        return ts.pathIsRelative(moduleName) || ts.isRootedDiskPath(moduleName);
+    }
+    ts.isExternalModuleNameRelative = isExternalModuleNameRelative;
+    function sortAndDeduplicateDiagnostics(diagnostics) {
+        return ts.sortAndDeduplicate(diagnostics, ts.compareDiagnostics);
+    }
+    ts.sortAndDeduplicateDiagnostics = sortAndDeduplicateDiagnostics;
+    function toPath(fileName, basePath, getCanonicalFileName) {
+        var nonCanonicalizedPath = ts.isRootedDiskPath(fileName)
+            ? ts.normalizePath(fileName)
+            : ts.getNormalizedAbsolutePath(fileName, basePath);
+        return getCanonicalFileName(nonCanonicalizedPath);
+    }
+    ts.toPath = toPath;
+    function hasEntries(map) {
+        return !!map && !!map.size;
+    }
+    ts.hasEntries = hasEntries;
+})(ts || (ts = {}));
+/* @internal */
 (function (ts) {
     ts.resolvingEmptyArray = [];
     ts.emptyMap = ts.createMap();
@@ -7692,6 +7508,22 @@ var ts;
         return undefined;
     }
     ts.getDeclarationOfKind = getDeclarationOfKind;
+    /** Create a new escaped identifier map. */
+    function createUnderscoreEscapedMap() {
+        return new ts.MapCtr();
+    }
+    ts.createUnderscoreEscapedMap = createUnderscoreEscapedMap;
+    function createSymbolTable(symbols) {
+        var result = ts.createMap();
+        if (symbols) {
+            for (var _i = 0, symbols_1 = symbols; _i < symbols_1.length; _i++) {
+                var symbol = symbols_1[_i];
+                result.set(symbol.escapedName, symbol);
+            }
+        }
+        return result;
+    }
+    ts.createSymbolTable = createSymbolTable;
     var stringWriter = createSingleLineStringWriter();
     function createSingleLineStringWriter() {
         var str = "";
@@ -7715,6 +7547,8 @@ var ts;
             getColumn: function () { return 0; },
             getIndent: function () { return 0; },
             isAtStartOfLine: function () { return false; },
+            // Completely ignore indentation for string writers.  And map newlines to
+            // a single space.
             writeLine: function () { return str += " "; },
             increaseIndent: ts.noop,
             decreaseIndent: ts.noop,
@@ -7725,6 +7559,80 @@ var ts;
             reportPrivateInBaseOfClassExpression: ts.noop,
         };
     }
+    function changesAffectModuleResolution(oldOptions, newOptions) {
+        return !oldOptions ||
+            (oldOptions.module !== newOptions.module) ||
+            (oldOptions.moduleResolution !== newOptions.moduleResolution) ||
+            (oldOptions.noResolve !== newOptions.noResolve) ||
+            (oldOptions.target !== newOptions.target) ||
+            (oldOptions.noLib !== newOptions.noLib) ||
+            (oldOptions.jsx !== newOptions.jsx) ||
+            (oldOptions.allowJs !== newOptions.allowJs) ||
+            (oldOptions.rootDir !== newOptions.rootDir) ||
+            (oldOptions.configFilePath !== newOptions.configFilePath) ||
+            (oldOptions.baseUrl !== newOptions.baseUrl) ||
+            (oldOptions.maxNodeModuleJsDepth !== newOptions.maxNodeModuleJsDepth) ||
+            !ts.arrayIsEqualTo(oldOptions.lib, newOptions.lib) ||
+            !ts.arrayIsEqualTo(oldOptions.typeRoots, newOptions.typeRoots) ||
+            !ts.arrayIsEqualTo(oldOptions.rootDirs, newOptions.rootDirs) ||
+            !ts.equalOwnProperties(oldOptions.paths, newOptions.paths);
+    }
+    ts.changesAffectModuleResolution = changesAffectModuleResolution;
+    function findAncestor(node, callback) {
+        while (node) {
+            var result = callback(node);
+            if (result === "quit") {
+                return undefined;
+            }
+            else if (result) {
+                return node;
+            }
+            node = node.parent;
+        }
+        return undefined;
+    }
+    ts.findAncestor = findAncestor;
+    function forEachEntry(map, callback) {
+        var _a;
+        var iterator = map.entries();
+        for (var _b = iterator.next(), pair = _b.value, done = _b.done; !done; _a = iterator.next(), pair = _a.value, done = _a.done, _a) {
+            var key = pair[0], value = pair[1];
+            var result = callback(value, key);
+            if (result) {
+                return result;
+            }
+        }
+        return undefined;
+    }
+    ts.forEachEntry = forEachEntry;
+    function forEachKey(map, callback) {
+        var _a;
+        var iterator = map.keys();
+        for (var _b = iterator.next(), key = _b.value, done = _b.done; !done; _a = iterator.next(), key = _a.value, done = _a.done, _a) {
+            var result = callback(key);
+            if (result) {
+                return result;
+            }
+        }
+        return undefined;
+    }
+    ts.forEachKey = forEachKey;
+    function copyEntries(source, target) {
+        source.forEach(function (value, key) {
+            target.set(key, value);
+        });
+    }
+    ts.copyEntries = copyEntries;
+    function arrayToSet(array, makeKey) {
+        return ts.arrayToMap(array, makeKey || (function (s) { return s; }), function () { return true; });
+    }
+    ts.arrayToSet = arrayToSet;
+    function cloneMap(map) {
+        var clone = ts.createMap();
+        copyEntries(map, clone);
+        return clone;
+    }
+    ts.cloneMap = cloneMap;
     function usingSingleLineStringWriter(action) {
         var oldString = stringWriter.getText();
         try {
@@ -7795,23 +7703,31 @@ var ts;
         return false;
     }
     ts.hasChangesInResolutions = hasChangesInResolutions;
+    // Returns true if this node contains a parse error anywhere underneath it.
     function containsParseError(node) {
         aggregateChildData(node);
-        return (node.flags & 131072) !== 0;
+        return (node.flags & 131072 /* ThisNodeOrAnySubNodesHasError */) !== 0;
     }
     ts.containsParseError = containsParseError;
     function aggregateChildData(node) {
-        if (!(node.flags & 262144)) {
-            var thisNodeOrAnySubNodesHasError = ((node.flags & 32768) !== 0) ||
+        if (!(node.flags & 262144 /* HasAggregatedChildData */)) {
+            // A node is considered to contain a parse error if:
+            //  a) the parser explicitly marked that it had an error
+            //  b) any of it's children reported that it had an error.
+            var thisNodeOrAnySubNodesHasError = ((node.flags & 32768 /* ThisNodeHasError */) !== 0) ||
                 ts.forEachChild(node, containsParseError);
+            // If so, mark ourselves accordingly.
             if (thisNodeOrAnySubNodesHasError) {
-                node.flags |= 131072;
+                node.flags |= 131072 /* ThisNodeOrAnySubNodesHasError */;
             }
-            node.flags |= 262144;
+            // Also mark that we've propagated the child information to this node.  This way we can
+            // always consult the bit directly on this node without needing to check its children
+            // again.
+            node.flags |= 262144 /* HasAggregatedChildData */;
         }
     }
     function getSourceFileOfNode(node) {
-        while (node && node.kind !== 274) {
+        while (node && node.kind !== 274 /* SourceFile */) {
             node = node.parent;
         }
         return node;
@@ -7819,11 +7735,11 @@ var ts;
     ts.getSourceFileOfNode = getSourceFileOfNode;
     function isStatementWithLocals(node) {
         switch (node.kind) {
-            case 213:
-            case 241:
-            case 220:
-            case 221:
-            case 222:
+            case 213 /* Block */:
+            case 241 /* CaseBlock */:
+            case 220 /* ForStatement */:
+            case 221 /* ForInStatement */:
+            case 222 /* ForOfStatement */:
                 return true;
         }
         return false;
@@ -7834,6 +7750,7 @@ var ts;
         return ts.getLineStarts(sourceFile)[line];
     }
     ts.getStartPositionOfLine = getStartPositionOfLine;
+    // This is a useful function for debugging purposes.
     function nodePosToString(node) {
         var file = getSourceFileOfNode(node);
         var loc = ts.getLineAndCharacterOfPosition(file, node.pos);
@@ -7846,12 +7763,19 @@ var ts;
         var lineIndex = line;
         var sourceText = sourceFile.text;
         if (lineIndex + 1 === lineStarts.length) {
+            // last line - return EOF
             return sourceText.length - 1;
         }
         else {
+            // current line start
             var start = lineStarts[lineIndex];
+            // take the start position of the next line - 1 = it should be some line break
             var pos = lineStarts[lineIndex + 1] - 1;
             ts.Debug.assert(ts.isLineBreak(sourceText.charCodeAt(pos)));
+            // walk backwards skipping line breaks, stop the the beginning of current line.
+            // i.e:
+            // <some text>
+            // $ <- end of line for this position should match the start position
             while (start <= pos && ts.isLineBreak(sourceText.charCodeAt(pos))) {
                 pos--;
             }
@@ -7859,21 +7783,45 @@ var ts;
         }
     }
     ts.getEndLinePosition = getEndLinePosition;
+    /**
+     * Returns a value indicating whether a name is unique globally or within the current file.
+     * Note: This does not consider whether a name appears as a free identifier or not, so at the expression `x.y` this includes both `x` and `y`.
+     */
     function isFileLevelUniqueName(sourceFile, name, hasGlobalName) {
         return !(hasGlobalName && hasGlobalName(name)) && !sourceFile.identifiers.has(name);
     }
     ts.isFileLevelUniqueName = isFileLevelUniqueName;
+    // Returns true if this node is missing from the actual source code. A 'missing' node is different
+    // from 'undefined/defined'. When a node is undefined (which can happen for optional nodes
+    // in the tree), it is definitely missing. However, a node may be defined, but still be
+    // missing.  This happens whenever the parser knows it needs to parse something, but can't
+    // get anything in the source code that it expects at that location. For example:
+    //
+    //          let a: ;
+    //
+    // Here, the Type in the Type-Annotation is not-optional (as there is a colon in the source
+    // code). So the parser will attempt to parse out a type, and will create an actual node.
+    // However, this node will be 'missing' in the sense that no actual source-code/tokens are
+    // contained within it.
     function nodeIsMissing(node) {
         if (node === undefined) {
             return true;
         }
-        return node.pos === node.end && node.pos >= 0 && node.kind !== 1;
+        return node.pos === node.end && node.pos >= 0 && node.kind !== 1 /* EndOfFileToken */;
     }
     ts.nodeIsMissing = nodeIsMissing;
     function nodeIsPresent(node) {
         return !nodeIsMissing(node);
     }
     ts.nodeIsPresent = nodeIsPresent;
+    /**
+     * Appends a range of value to begin of an array, returning the array.
+     *
+     * @param to The array to which `value` is to be appended. If `to` is `undefined`, a new array
+     * is created if `value` was appended.
+     * @param from The values to append to the array. If `from` is `undefined`, nothing is
+     * appended. If an element of `from` is `undefined`, that element is not appended.
+     */
     function prependStatements(to, from) {
         if (from === undefined || from.length === 0)
             return to;
@@ -7887,10 +7835,17 @@ var ts;
         return to;
     }
     ts.prependStatements = prependStatements;
+    /**
+     * Determine if the given comment is a triple-slash
+     *
+     * @return true if the comment is a triple-slash comment else false
+     */
     function isRecognizedTripleSlashComment(text, commentPos, commentEnd) {
-        if (text.charCodeAt(commentPos + 1) === 47 &&
+        // Verify this is /// comment, but do the regexp match only when we first can find /// in the comment text
+        // so that we don't end up computing comment string and doing match for all // comments
+        if (text.charCodeAt(commentPos + 1) === 47 /* slash */ &&
             commentPos + 2 < commentEnd &&
-            text.charCodeAt(commentPos + 2) === 47) {
+            text.charCodeAt(commentPos + 2) === 47 /* slash */) {
             var textSubStr = text.substring(commentPos, commentEnd);
             return textSubStr.match(ts.fullTripleSlashReferencePathRegEx) ||
                 textSubStr.match(ts.fullTripleSlashAMDReferencePathRegEx) ||
@@ -7902,21 +7857,27 @@ var ts;
     }
     ts.isRecognizedTripleSlashComment = isRecognizedTripleSlashComment;
     function isPinnedComment(text, start) {
-        return text.charCodeAt(start + 1) === 42 &&
-            text.charCodeAt(start + 2) === 33;
+        return text.charCodeAt(start + 1) === 42 /* asterisk */ &&
+            text.charCodeAt(start + 2) === 33 /* exclamation */;
     }
     ts.isPinnedComment = isPinnedComment;
     function getTokenPosOfNode(node, sourceFile, includeJsDoc) {
+        // With nodes that have no width (i.e. 'Missing' nodes), we actually *don't*
+        // want to skip trivia because this will launch us forward to the next token.
         if (nodeIsMissing(node)) {
             return node.pos;
         }
         if (ts.isJSDocNode(node)) {
-            return ts.skipTrivia((sourceFile || getSourceFileOfNode(node)).text, node.pos, false, true);
+            return ts.skipTrivia((sourceFile || getSourceFileOfNode(node)).text, node.pos, /*stopAfterLineBreak*/ false, /*stopAtComments*/ true);
         }
         if (includeJsDoc && ts.hasJSDocNodes(node)) {
             return getTokenPosOfNode(node.jsDoc[0]);
         }
-        if (node.kind === 299 && node._children.length > 0) {
+        // For a syntax list, it is possible that one of its children has JSDocComment nodes, while
+        // the syntax list itself considers them as normal trivia. Therefore if we simply skip
+        // trivia for the list, we may have skipped the JSDocComment as well. So we should process its
+        // first child to determine the actual position of its first token.
+        if (node.kind === 299 /* SyntaxList */ && node._children.length > 0) {
             return getTokenPosOfNode(node._children[0], sourceFile, includeJsDoc);
         }
         return ts.skipTrivia((sourceFile || getSourceFileOfNode(node)).text, node.pos);
@@ -7950,38 +7911,51 @@ var ts;
     function getPos(range) {
         return range.pos;
     }
+    /**
+     * Note: it is expected that the `nodeArray` and the `node` are within the same file.
+     * For example, searching for a `SourceFile` in a `SourceFile[]` wouldn't work.
+     */
     function indexOfNode(nodeArray, node) {
         return ts.binarySearch(nodeArray, node, getPos, ts.compareValues);
     }
     ts.indexOfNode = indexOfNode;
+    /**
+     * Gets flags that control emit behavior of a node.
+     */
     function getEmitFlags(node) {
         var emitNode = node.emitNode;
         return emitNode && emitNode.flags || 0;
     }
     ts.getEmitFlags = getEmitFlags;
     function getLiteralText(node, sourceFile) {
-        if (!nodeIsSynthesized(node) && node.parent && !(ts.isNumericLiteral(node) && node.numericLiteralFlags & 512)) {
+        // If we don't need to downlevel and we can reach the original source text using
+        // the node's parent reference, then simply get the text as it was originally written.
+        if (!nodeIsSynthesized(node) && node.parent && !(ts.isNumericLiteral(node) && node.numericLiteralFlags & 512 /* ContainsSeparator */)) {
             return getSourceTextOfNodeFromSourceFile(sourceFile, node);
         }
-        var escapeText = getEmitFlags(node) & 16777216 ? escapeString : escapeNonAsciiString;
+        var escapeText = getEmitFlags(node) & 16777216 /* NoAsciiEscaping */ ? escapeString : escapeNonAsciiString;
+        // If we can't reach the original source text, use the canonical form if it's a number,
+        // or a (possibly escaped) quoted form of the original text if it's string-like.
         switch (node.kind) {
-            case 9:
+            case 9 /* StringLiteral */:
                 if (node.singleQuote) {
-                    return "'" + escapeText(node.text, 39) + "'";
+                    return "'" + escapeText(node.text, 39 /* singleQuote */) + "'";
                 }
                 else {
-                    return '"' + escapeText(node.text, 34) + '"';
+                    return '"' + escapeText(node.text, 34 /* doubleQuote */) + '"';
                 }
-            case 13:
-                return "`" + escapeText(node.text, 96) + "`";
-            case 14:
-                return "`" + escapeText(node.text, 96) + "${";
-            case 15:
-                return "}" + escapeText(node.text, 96) + "${";
-            case 16:
-                return "}" + escapeText(node.text, 96) + "`";
-            case 8:
-            case 12:
+            case 13 /* NoSubstitutionTemplateLiteral */:
+                return "`" + escapeText(node.text, 96 /* backtick */) + "`";
+            case 14 /* TemplateHead */:
+                // tslint:disable-next-line no-invalid-template-strings
+                return "`" + escapeText(node.text, 96 /* backtick */) + "${";
+            case 15 /* TemplateMiddle */:
+                // tslint:disable-next-line no-invalid-template-strings
+                return "}" + escapeText(node.text, 96 /* backtick */) + "${";
+            case 16 /* TemplateTail */:
+                return "}" + escapeText(node.text, 96 /* backtick */) + "`";
+            case 8 /* NumericLiteral */:
+            case 12 /* RegularExpressionLiteral */:
                 return node.text;
         }
         return ts.Debug.fail("Literal kind '" + node.kind + "' not accounted for.");
@@ -7991,55 +7965,74 @@ var ts;
         return ts.isString(value) ? '"' + escapeNonAsciiString(value) + '"' : "" + value;
     }
     ts.getTextOfConstantValue = getTextOfConstantValue;
+    // Add an extra underscore to identifiers that start with two underscores to avoid issues with magic names like '__proto__'
     function escapeLeadingUnderscores(identifier) {
-        return (identifier.length >= 2 && identifier.charCodeAt(0) === 95 && identifier.charCodeAt(1) === 95 ? "_" + identifier : identifier);
+        return (identifier.length >= 2 && identifier.charCodeAt(0) === 95 /* _ */ && identifier.charCodeAt(1) === 95 /* _ */ ? "_" + identifier : identifier);
     }
     ts.escapeLeadingUnderscores = escapeLeadingUnderscores;
+    /**
+     * @deprecated Use `id.escapedText` to get the escaped text of an Identifier.
+     * @param identifier The identifier to escape
+     */
     function escapeIdentifier(identifier) {
         return identifier;
     }
     ts.escapeIdentifier = escapeIdentifier;
+    // Make an identifier from an external module name by extracting the string after the last "/" and replacing
+    // all non-alphanumeric characters with underscores
     function makeIdentifierFromModuleName(moduleName) {
         return ts.getBaseFileName(moduleName).replace(/^(\d)/, "_$1").replace(/\W/g, "_");
     }
     ts.makeIdentifierFromModuleName = makeIdentifierFromModuleName;
     function isBlockOrCatchScoped(declaration) {
-        return (ts.getCombinedNodeFlags(declaration) & 3) !== 0 ||
+        return (ts.getCombinedNodeFlags(declaration) & 3 /* BlockScoped */) !== 0 ||
             isCatchClauseVariableDeclarationOrBindingElement(declaration);
     }
     ts.isBlockOrCatchScoped = isBlockOrCatchScoped;
     function isCatchClauseVariableDeclarationOrBindingElement(declaration) {
         var node = getRootDeclaration(declaration);
-        return node.kind === 232 && node.parent.kind === 269;
+        return node.kind === 232 /* VariableDeclaration */ && node.parent.kind === 269 /* CatchClause */;
     }
     ts.isCatchClauseVariableDeclarationOrBindingElement = isCatchClauseVariableDeclarationOrBindingElement;
     function isAmbientModule(node) {
-        return ts.isModuleDeclaration(node) && (node.name.kind === 9 || isGlobalScopeAugmentation(node));
+        return ts.isModuleDeclaration(node) && (node.name.kind === 9 /* StringLiteral */ || isGlobalScopeAugmentation(node));
     }
     ts.isAmbientModule = isAmbientModule;
     function isModuleWithStringLiteralName(node) {
-        return ts.isModuleDeclaration(node) && node.name.kind === 9;
+        return ts.isModuleDeclaration(node) && node.name.kind === 9 /* StringLiteral */;
     }
     ts.isModuleWithStringLiteralName = isModuleWithStringLiteralName;
     function isNonGlobalAmbientModule(node) {
         return ts.isModuleDeclaration(node) && ts.isStringLiteral(node.name);
     }
     ts.isNonGlobalAmbientModule = isNonGlobalAmbientModule;
+    /**
+     * An effective module (namespace) declaration is either
+     * 1. An actual declaration: namespace X { ... }
+     * 2. A Javascript declaration, which is:
+     *    An identifier in a nested property access expression: Y in `X.Y.Z = { ... }`
+     */
+    function isEffectiveModuleDeclaration(node) {
+        return ts.isModuleDeclaration(node) || ts.isIdentifier(node);
+    }
+    ts.isEffectiveModuleDeclaration = isEffectiveModuleDeclaration;
+    /** Given a symbol for a module, checks that it is a shorthand ambient module. */
     function isShorthandAmbientModuleSymbol(moduleSymbol) {
         return isShorthandAmbientModule(moduleSymbol.valueDeclaration);
     }
     ts.isShorthandAmbientModuleSymbol = isShorthandAmbientModuleSymbol;
     function isShorthandAmbientModule(node) {
-        return node && node.kind === 239 && (!node.body);
+        // The only kind of module that can be missing a body is a shorthand ambient module.
+        return node && node.kind === 239 /* ModuleDeclaration */ && (!node.body);
     }
     function isBlockScopedContainerTopLevel(node) {
-        return node.kind === 274 ||
-            node.kind === 239 ||
+        return node.kind === 274 /* SourceFile */ ||
+            node.kind === 239 /* ModuleDeclaration */ ||
             ts.isFunctionLike(node);
     }
     ts.isBlockScopedContainerTopLevel = isBlockScopedContainerTopLevel;
     function isGlobalScopeAugmentation(module) {
-        return !!(module.flags & 512);
+        return !!(module.flags & 512 /* GlobalAugmentation */);
     }
     ts.isGlobalScopeAugmentation = isGlobalScopeAugmentation;
     function isExternalModuleAugmentation(node) {
@@ -8047,10 +8040,13 @@ var ts;
     }
     ts.isExternalModuleAugmentation = isExternalModuleAugmentation;
     function isModuleAugmentationExternal(node) {
+        // external module augmentation is a ambient module declaration that is either:
+        // - defined in the top level scope and source file is an external module
+        // - defined inside ambient module declaration located in the top level scope and source file not an external module
         switch (node.parent.kind) {
-            case 274:
+            case 274 /* SourceFile */:
                 return ts.isExternalModule(node.parent);
-            case 240:
+            case 240 /* ModuleBlock */:
                 return isAmbientModule(node.parent.parent) && ts.isSourceFile(node.parent.parent.parent) && !ts.isExternalModule(node.parent.parent.parent);
         }
         return false;
@@ -8062,22 +8058,24 @@ var ts;
     ts.isEffectiveExternalModule = isEffectiveExternalModule;
     function isBlockScope(node, parentNode) {
         switch (node.kind) {
-            case 274:
-            case 241:
-            case 269:
-            case 239:
-            case 220:
-            case 221:
-            case 222:
-            case 155:
-            case 154:
-            case 156:
-            case 157:
-            case 234:
-            case 192:
-            case 193:
+            case 274 /* SourceFile */:
+            case 241 /* CaseBlock */:
+            case 269 /* CatchClause */:
+            case 239 /* ModuleDeclaration */:
+            case 220 /* ForStatement */:
+            case 221 /* ForInStatement */:
+            case 222 /* ForOfStatement */:
+            case 155 /* Constructor */:
+            case 154 /* MethodDeclaration */:
+            case 156 /* GetAccessor */:
+            case 157 /* SetAccessor */:
+            case 234 /* FunctionDeclaration */:
+            case 192 /* FunctionExpression */:
+            case 193 /* ArrowFunction */:
                 return true;
-            case 213:
+            case 213 /* Block */:
+                // function block is not considered block-scope container
+                // see comment in binder.ts: bind(...), case for SyntaxKind.Block
                 return !ts.isFunctionLike(parentNode);
         }
         return false;
@@ -8085,28 +8083,28 @@ var ts;
     ts.isBlockScope = isBlockScope;
     function isDeclarationWithTypeParameters(node) {
         switch (node.kind) {
-            case 158:
-            case 159:
-            case 153:
-            case 160:
-            case 163:
-            case 164:
-            case 284:
-            case 235:
-            case 205:
-            case 236:
-            case 237:
-            case 296:
-            case 234:
-            case 154:
-            case 155:
-            case 156:
-            case 157:
-            case 192:
-            case 193:
-            case 292:
-            case 297:
-            case 288:
+            case 158 /* CallSignature */:
+            case 159 /* ConstructSignature */:
+            case 153 /* MethodSignature */:
+            case 160 /* IndexSignature */:
+            case 163 /* FunctionType */:
+            case 164 /* ConstructorType */:
+            case 284 /* JSDocFunctionType */:
+            case 235 /* ClassDeclaration */:
+            case 205 /* ClassExpression */:
+            case 236 /* InterfaceDeclaration */:
+            case 237 /* TypeAliasDeclaration */:
+            case 296 /* JSDocTemplateTag */:
+            case 234 /* FunctionDeclaration */:
+            case 154 /* MethodDeclaration */:
+            case 155 /* Constructor */:
+            case 156 /* GetAccessor */:
+            case 157 /* SetAccessor */:
+            case 192 /* FunctionExpression */:
+            case 193 /* ArrowFunction */:
+            case 292 /* JSDocCallbackTag */:
+            case 297 /* JSDocTypedefTag */:
+            case 288 /* JSDocSignature */:
                 return true;
             default:
                 ts.assertTypeIsNever(node);
@@ -8116,8 +8114,8 @@ var ts;
     ts.isDeclarationWithTypeParameters = isDeclarationWithTypeParameters;
     function isAnyImportSyntax(node) {
         switch (node.kind) {
-            case 244:
-            case 243:
+            case 244 /* ImportDeclaration */:
+            case 243 /* ImportEqualsDeclaration */:
                 return true;
             default:
                 return false;
@@ -8126,15 +8124,15 @@ var ts;
     ts.isAnyImportSyntax = isAnyImportSyntax;
     function isLateVisibilityPaintedStatement(node) {
         switch (node.kind) {
-            case 244:
-            case 243:
-            case 214:
-            case 235:
-            case 234:
-            case 239:
-            case 237:
-            case 236:
-            case 238:
+            case 244 /* ImportDeclaration */:
+            case 243 /* ImportEqualsDeclaration */:
+            case 214 /* VariableStatement */:
+            case 235 /* ClassDeclaration */:
+            case 234 /* FunctionDeclaration */:
+            case 239 /* ModuleDeclaration */:
+            case 237 /* TypeAliasDeclaration */:
+            case 236 /* InterfaceDeclaration */:
+            case 238 /* EnumDeclaration */:
                 return true;
             default:
                 return false;
@@ -8145,10 +8143,15 @@ var ts;
         return isAnyImportSyntax(node) || ts.isExportDeclaration(node);
     }
     ts.isAnyImportOrReExport = isAnyImportOrReExport;
+    // Gets the nearest enclosing block scope container that has the provided node
+    // as a descendant, that is not the provided node.
     function getEnclosingBlockScopeContainer(node) {
-        return ts.findAncestor(node.parent, function (current) { return isBlockScope(current, current.parent); });
+        return findAncestor(node.parent, function (current) { return isBlockScope(current, current.parent); });
     }
     ts.getEnclosingBlockScopeContainer = getEnclosingBlockScopeContainer;
+    // Return display name of an identifier
+    // Computed property names will just be emitted as "[<expr>]", where <expr> is the source
+    // text of the expression in the computed property.
     function declarationNameToString(name) {
         return getFullWidth(name) === 0 ? "(Missing)" : getTextOfNode(name);
     }
@@ -8159,13 +8162,13 @@ var ts;
     ts.getNameFromIndexInfo = getNameFromIndexInfo;
     function getTextOfPropertyName(name) {
         switch (name.kind) {
-            case 71:
+            case 71 /* Identifier */:
                 return name.escapedText;
-            case 9:
-            case 8:
+            case 9 /* StringLiteral */:
+            case 8 /* NumericLiteral */:
                 return escapeLeadingUnderscores(name.text);
-            case 147:
-                return isStringOrNumericLiteral(name.expression) ? escapeLeadingUnderscores(name.expression.text) : undefined;
+            case 147 /* ComputedPropertyName */:
+                return isStringOrNumericLiteral(name.expression) ? escapeLeadingUnderscores(name.expression.text) : undefined; // TODO: GH#18217 Almost all uses of this assume the result to be defined!
             default:
                 ts.Debug.assertNever(name);
         }
@@ -8173,11 +8176,11 @@ var ts;
     ts.getTextOfPropertyName = getTextOfPropertyName;
     function entityNameToString(name) {
         switch (name.kind) {
-            case 71:
+            case 71 /* Identifier */:
                 return getFullWidth(name) === 0 ? ts.idText(name) : getTextOfNode(name);
-            case 146:
+            case 146 /* QualifiedName */:
                 return entityNameToString(name.left) + "." + entityNameToString(name.right);
-            case 185:
+            case 185 /* PropertyAccessExpression */:
                 return entityNameToString(name.expression) + "." + entityNameToString(name.name);
             default:
                 throw ts.Debug.assertNever(name);
@@ -8213,7 +8216,7 @@ var ts;
     }
     ts.createDiagnosticForNodeFromMessageChain = createDiagnosticForNodeFromMessageChain;
     function getSpanOfTokenAtPosition(sourceFile, pos) {
-        var scanner = ts.createScanner(sourceFile.languageVersion, true, sourceFile.languageVariant, sourceFile.text, undefined, pos);
+        var scanner = ts.createScanner(sourceFile.languageVersion, /*skipTrivia*/ true, sourceFile.languageVariant, sourceFile.text, /*onError:*/ undefined, pos);
         scanner.scan();
         var start = scanner.getTokenPos();
         return ts.createTextSpanFromBounds(start, scanner.getTextPos());
@@ -8221,10 +8224,12 @@ var ts;
     ts.getSpanOfTokenAtPosition = getSpanOfTokenAtPosition;
     function getErrorSpanForArrowFunction(sourceFile, node) {
         var pos = ts.skipTrivia(sourceFile.text, node.pos);
-        if (node.body && node.body.kind === 213) {
+        if (node.body && node.body.kind === 213 /* Block */) {
             var startLine = ts.getLineAndCharacterOfPosition(sourceFile, node.body.pos).line;
             var endLine = ts.getLineAndCharacterOfPosition(sourceFile, node.body.end).line;
             if (startLine < endLine) {
+                // The arrow function spans multiple lines,
+                // make the error span be the first line, inclusive.
                 return ts.createTextSpan(pos, getEndLinePosition(startLine, sourceFile) - pos + 1);
             }
         }
@@ -8233,40 +8238,46 @@ var ts;
     function getErrorSpanForNode(sourceFile, node) {
         var errorNode = node;
         switch (node.kind) {
-            case 274:
-                var pos_1 = ts.skipTrivia(sourceFile.text, 0, false);
+            case 274 /* SourceFile */:
+                var pos_1 = ts.skipTrivia(sourceFile.text, 0, /*stopAfterLineBreak*/ false);
                 if (pos_1 === sourceFile.text.length) {
+                    // file is empty - return span for the beginning of the file
                     return ts.createTextSpan(0, 0);
                 }
                 return getSpanOfTokenAtPosition(sourceFile, pos_1);
-            case 232:
-            case 182:
-            case 235:
-            case 205:
-            case 236:
-            case 239:
-            case 238:
-            case 273:
-            case 234:
-            case 192:
-            case 154:
-            case 156:
-            case 157:
-            case 237:
-            case 152:
-            case 151:
+            // This list is a work in progress. Add missing node kinds to improve their error
+            // spans.
+            case 232 /* VariableDeclaration */:
+            case 182 /* BindingElement */:
+            case 235 /* ClassDeclaration */:
+            case 205 /* ClassExpression */:
+            case 236 /* InterfaceDeclaration */:
+            case 239 /* ModuleDeclaration */:
+            case 238 /* EnumDeclaration */:
+            case 273 /* EnumMember */:
+            case 234 /* FunctionDeclaration */:
+            case 192 /* FunctionExpression */:
+            case 154 /* MethodDeclaration */:
+            case 156 /* GetAccessor */:
+            case 157 /* SetAccessor */:
+            case 237 /* TypeAliasDeclaration */:
+            case 152 /* PropertyDeclaration */:
+            case 151 /* PropertySignature */:
                 errorNode = node.name;
                 break;
-            case 193:
+            case 193 /* ArrowFunction */:
                 return getErrorSpanForArrowFunction(sourceFile, node);
         }
         if (errorNode === undefined) {
+            // If we don't have a better node, then just set the error on the first token of
+            // construct.
             return getSpanOfTokenAtPosition(sourceFile, node.pos);
         }
         var isMissing = nodeIsMissing(errorNode);
         var pos = isMissing
             ? errorNode.pos
             : ts.skipTrivia(sourceFile.text, errorNode.pos);
+        // These asserts should all be satisfied for a properly constructed `errorNode`.
         if (isMissing) {
             ts.Debug.assert(pos === errorNode.pos, "This failure could trigger https://github.com/Microsoft/TypeScript/issues/20809");
             ts.Debug.assert(pos === errorNode.end, "This failure could trigger https://github.com/Microsoft/TypeScript/issues/20809");
@@ -8283,57 +8294,58 @@ var ts;
     }
     ts.isExternalOrCommonJsModule = isExternalOrCommonJsModule;
     function isJsonSourceFile(file) {
-        return file.scriptKind === 6;
+        return file.scriptKind === 6 /* JSON */;
     }
     ts.isJsonSourceFile = isJsonSourceFile;
     function isConstEnumDeclaration(node) {
-        return node.kind === 238 && isConst(node);
+        return node.kind === 238 /* EnumDeclaration */ && isConst(node);
     }
     ts.isConstEnumDeclaration = isConstEnumDeclaration;
     function isConst(node) {
-        return !!(ts.getCombinedNodeFlags(node) & 2)
-            || !!(ts.getCombinedModifierFlags(node) & 2048);
+        return !!(ts.getCombinedNodeFlags(node) & 2 /* Const */)
+            || !!(ts.getCombinedModifierFlags(node) & 2048 /* Const */);
     }
     ts.isConst = isConst;
     function isLet(node) {
-        return !!(ts.getCombinedNodeFlags(node) & 1);
+        return !!(ts.getCombinedNodeFlags(node) & 1 /* Let */);
     }
     ts.isLet = isLet;
     function isSuperCall(n) {
-        return n.kind === 187 && n.expression.kind === 97;
+        return n.kind === 187 /* CallExpression */ && n.expression.kind === 97 /* SuperKeyword */;
     }
     ts.isSuperCall = isSuperCall;
     function isImportCall(n) {
-        return n.kind === 187 && n.expression.kind === 91;
+        return n.kind === 187 /* CallExpression */ && n.expression.kind === 91 /* ImportKeyword */;
     }
     ts.isImportCall = isImportCall;
     function isLiteralImportTypeNode(n) {
-        return n.kind === 179 &&
-            n.argument.kind === 178 &&
+        return n.kind === 179 /* ImportType */ &&
+            n.argument.kind === 178 /* LiteralType */ &&
             ts.isStringLiteral(n.argument.literal);
     }
     ts.isLiteralImportTypeNode = isLiteralImportTypeNode;
     function isPrologueDirective(node) {
-        return node.kind === 216
-            && node.expression.kind === 9;
+        return node.kind === 216 /* ExpressionStatement */
+            && node.expression.kind === 9 /* StringLiteral */;
     }
     ts.isPrologueDirective = isPrologueDirective;
     function getLeadingCommentRangesOfNode(node, sourceFileOfNode) {
-        return node.kind !== 10 ? ts.getLeadingCommentRanges(sourceFileOfNode.text, node.pos) : undefined;
+        return node.kind !== 10 /* JsxText */ ? ts.getLeadingCommentRanges(sourceFileOfNode.text, node.pos) : undefined;
     }
     ts.getLeadingCommentRangesOfNode = getLeadingCommentRangesOfNode;
     function getJSDocCommentRanges(node, text) {
-        var commentRanges = (node.kind === 149 ||
-            node.kind === 148 ||
-            node.kind === 192 ||
-            node.kind === 193 ||
-            node.kind === 191) ?
+        var commentRanges = (node.kind === 149 /* Parameter */ ||
+            node.kind === 148 /* TypeParameter */ ||
+            node.kind === 192 /* FunctionExpression */ ||
+            node.kind === 193 /* ArrowFunction */ ||
+            node.kind === 191 /* ParenthesizedExpression */) ?
             ts.concatenate(ts.getTrailingCommentRanges(text, node.pos), ts.getLeadingCommentRanges(text, node.pos)) :
             ts.getLeadingCommentRanges(text, node.pos);
+        // True if the comment starts with '/**' but not if it is '/**/'
         return ts.filter(commentRanges, function (comment) {
-            return text.charCodeAt(comment.pos + 1) === 42 &&
-                text.charCodeAt(comment.pos + 2) === 42 &&
-                text.charCodeAt(comment.pos + 3) !== 47;
+            return text.charCodeAt(comment.pos + 1) === 42 /* asterisk */ &&
+                text.charCodeAt(comment.pos + 2) === 42 /* asterisk */ &&
+                text.charCodeAt(comment.pos + 3) !== 47 /* slash */;
         });
     }
     ts.getJSDocCommentRanges = getJSDocCommentRanges;
@@ -8342,75 +8354,87 @@ var ts;
     ts.fullTripleSlashAMDReferencePathRegEx = /^(\/\/\/\s*<amd-dependency\s+path\s*=\s*)('|")(.+?)\2.*?\/>/;
     var defaultLibReferenceRegEx = /^(\/\/\/\s*<reference\s+no-default-lib\s*=\s*)('|")(.+?)\2\s*\/>/;
     function isPartOfTypeNode(node) {
-        if (161 <= node.kind && node.kind <= 179) {
+        if (161 /* FirstTypeNode */ <= node.kind && node.kind <= 179 /* LastTypeNode */) {
             return true;
         }
         switch (node.kind) {
-            case 119:
-            case 142:
-            case 134:
-            case 137:
-            case 122:
-            case 138:
-            case 140:
-            case 131:
+            case 119 /* AnyKeyword */:
+            case 142 /* UnknownKeyword */:
+            case 134 /* NumberKeyword */:
+            case 137 /* StringKeyword */:
+            case 122 /* BooleanKeyword */:
+            case 138 /* SymbolKeyword */:
+            case 140 /* UndefinedKeyword */:
+            case 131 /* NeverKeyword */:
                 return true;
-            case 105:
-                return node.parent.kind !== 196;
-            case 207:
+            case 105 /* VoidKeyword */:
+                return node.parent.kind !== 196 /* VoidExpression */;
+            case 207 /* ExpressionWithTypeArguments */:
                 return !isExpressionWithTypeArgumentsInClassExtendsClause(node);
-            case 148:
-                return node.parent.kind === 177 || node.parent.kind === 172;
-            case 71:
-                if (node.parent.kind === 146 && node.parent.right === node) {
+            case 148 /* TypeParameter */:
+                return node.parent.kind === 177 /* MappedType */ || node.parent.kind === 172 /* InferType */;
+            // Identifiers and qualified names may be type nodes, depending on their context. Climb
+            // above them to find the lowest container
+            case 71 /* Identifier */:
+                // If the identifier is the RHS of a qualified name, then it's a type iff its parent is.
+                if (node.parent.kind === 146 /* QualifiedName */ && node.parent.right === node) {
                     node = node.parent;
                 }
-                else if (node.parent.kind === 185 && node.parent.name === node) {
+                else if (node.parent.kind === 185 /* PropertyAccessExpression */ && node.parent.name === node) {
                     node = node.parent;
                 }
-                ts.Debug.assert(node.kind === 71 || node.kind === 146 || node.kind === 185, "'node' was expected to be a qualified name, identifier or property access in 'isPartOfTypeNode'.");
-            case 146:
-            case 185:
-            case 99: {
+                // At this point, node is either a qualified name or an identifier
+                ts.Debug.assert(node.kind === 71 /* Identifier */ || node.kind === 146 /* QualifiedName */ || node.kind === 185 /* PropertyAccessExpression */, "'node' was expected to be a qualified name, identifier or property access in 'isPartOfTypeNode'.");
+            // falls through
+            case 146 /* QualifiedName */:
+            case 185 /* PropertyAccessExpression */:
+            case 99 /* ThisKeyword */: {
                 var parent = node.parent;
-                if (parent.kind === 165) {
+                if (parent.kind === 165 /* TypeQuery */) {
                     return false;
                 }
-                if (parent.kind === 179) {
+                if (parent.kind === 179 /* ImportType */) {
                     return !parent.isTypeOf;
                 }
-                if (161 <= parent.kind && parent.kind <= 179) {
+                // Do not recursively call isPartOfTypeNode on the parent. In the example:
+                //
+                //     let a: A.B.C;
+                //
+                // Calling isPartOfTypeNode would consider the qualified name A.B a type node.
+                // Only C and A.B.C are type nodes.
+                if (161 /* FirstTypeNode */ <= parent.kind && parent.kind <= 179 /* LastTypeNode */) {
                     return true;
                 }
                 switch (parent.kind) {
-                    case 207:
+                    case 207 /* ExpressionWithTypeArguments */:
                         return !isExpressionWithTypeArgumentsInClassExtendsClause(parent);
-                    case 148:
+                    case 148 /* TypeParameter */:
                         return node === parent.constraint;
-                    case 152:
-                    case 151:
-                    case 149:
-                    case 232:
+                    case 152 /* PropertyDeclaration */:
+                    case 151 /* PropertySignature */:
+                    case 149 /* Parameter */:
+                    case 232 /* VariableDeclaration */:
                         return node === parent.type;
-                    case 234:
-                    case 192:
-                    case 193:
-                    case 155:
-                    case 154:
-                    case 153:
-                    case 156:
-                    case 157:
+                    case 234 /* FunctionDeclaration */:
+                    case 192 /* FunctionExpression */:
+                    case 193 /* ArrowFunction */:
+                    case 155 /* Constructor */:
+                    case 154 /* MethodDeclaration */:
+                    case 153 /* MethodSignature */:
+                    case 156 /* GetAccessor */:
+                    case 157 /* SetAccessor */:
                         return node === parent.type;
-                    case 158:
-                    case 159:
-                    case 160:
+                    case 158 /* CallSignature */:
+                    case 159 /* ConstructSignature */:
+                    case 160 /* IndexSignature */:
                         return node === parent.type;
-                    case 190:
+                    case 190 /* TypeAssertionExpression */:
                         return node === parent.type;
-                    case 187:
-                    case 188:
+                    case 187 /* CallExpression */:
+                    case 188 /* NewExpression */:
                         return ts.contains(parent.typeArguments, node);
-                    case 189:
+                    case 189 /* TaggedTemplateExpression */:
+                        // TODO (drosen): TaggedTemplateExpressions may eventually support type arguments.
                         return false;
                 }
             }
@@ -8428,27 +8452,29 @@ var ts;
         return false;
     }
     ts.isChildOfNodeWithKind = isChildOfNodeWithKind;
+    // Warning: This has the same semantics as the forEach family of functions,
+    //          in that traversal terminates in the event that 'visitor' supplies a truthy value.
     function forEachReturnStatement(body, visitor) {
         return traverse(body);
         function traverse(node) {
             switch (node.kind) {
-                case 225:
+                case 225 /* ReturnStatement */:
                     return visitor(node);
-                case 241:
-                case 213:
-                case 217:
-                case 218:
-                case 219:
-                case 220:
-                case 221:
-                case 222:
-                case 226:
-                case 227:
-                case 266:
-                case 267:
-                case 228:
-                case 230:
-                case 269:
+                case 241 /* CaseBlock */:
+                case 213 /* Block */:
+                case 217 /* IfStatement */:
+                case 218 /* DoStatement */:
+                case 219 /* WhileStatement */:
+                case 220 /* ForStatement */:
+                case 221 /* ForInStatement */:
+                case 222 /* ForOfStatement */:
+                case 226 /* WithStatement */:
+                case 227 /* SwitchStatement */:
+                case 266 /* CaseClause */:
+                case 267 /* DefaultClause */:
+                case 228 /* LabeledStatement */:
+                case 230 /* TryStatement */:
+                case 269 /* CatchClause */:
                     return ts.forEachChild(node, traverse);
             }
         }
@@ -8458,39 +8484,52 @@ var ts;
         return traverse(body);
         function traverse(node) {
             switch (node.kind) {
-                case 203:
+                case 203 /* YieldExpression */:
                     visitor(node);
                     var operand = node.expression;
                     if (operand) {
                         traverse(operand);
                     }
                     return;
-                case 238:
-                case 236:
-                case 239:
-                case 237:
-                case 235:
-                case 205:
+                case 238 /* EnumDeclaration */:
+                case 236 /* InterfaceDeclaration */:
+                case 239 /* ModuleDeclaration */:
+                case 237 /* TypeAliasDeclaration */:
+                case 235 /* ClassDeclaration */:
+                case 205 /* ClassExpression */:
+                    // These are not allowed inside a generator now, but eventually they may be allowed
+                    // as local types. Regardless, any yield statements contained within them should be
+                    // skipped in this traversal.
                     return;
                 default:
                     if (ts.isFunctionLike(node)) {
-                        if (node.name && node.name.kind === 147) {
+                        if (node.name && node.name.kind === 147 /* ComputedPropertyName */) {
+                            // Note that we will not include methods/accessors of a class because they would require
+                            // first descending into the class. This is by design.
                             traverse(node.name.expression);
                             return;
                         }
                     }
                     else if (!isPartOfTypeNode(node)) {
+                        // This is the general case, which should include mostly expressions and statements.
+                        // Also includes NodeArrays.
                         ts.forEachChild(node, traverse);
                     }
             }
         }
     }
     ts.forEachYieldExpression = forEachYieldExpression;
+    /**
+     * Gets the most likely element type for a TypeNode. This is not an exhaustive test
+     * as it assumes a rest argument can only be an array type (either T[], or Array<T>).
+     *
+     * @param node The type node.
+     */
     function getRestParameterElementType(node) {
-        if (node && node.kind === 167) {
+        if (node && node.kind === 167 /* ArrayType */) {
             return node.elementType;
         }
-        else if (node && node.kind === 162) {
+        else if (node && node.kind === 162 /* TypeReference */) {
             return ts.singleOrUndefined(node.typeArguments);
         }
         else {
@@ -8500,12 +8539,12 @@ var ts;
     ts.getRestParameterElementType = getRestParameterElementType;
     function getMembersOfDeclaration(node) {
         switch (node.kind) {
-            case 236:
-            case 235:
-            case 205:
-            case 166:
+            case 236 /* InterfaceDeclaration */:
+            case 235 /* ClassDeclaration */:
+            case 205 /* ClassExpression */:
+            case 166 /* TypeLiteral */:
                 return node.members;
-            case 184:
+            case 184 /* ObjectLiteralExpression */:
                 return node.properties;
         }
     }
@@ -8513,14 +8552,14 @@ var ts;
     function isVariableLike(node) {
         if (node) {
             switch (node.kind) {
-                case 182:
-                case 273:
-                case 149:
-                case 270:
-                case 152:
-                case 151:
-                case 271:
-                case 232:
+                case 182 /* BindingElement */:
+                case 273 /* EnumMember */:
+                case 149 /* Parameter */:
+                case 270 /* PropertyAssignment */:
+                case 152 /* PropertyDeclaration */:
+                case 151 /* PropertySignature */:
+                case 271 /* ShorthandPropertyAssignment */:
+                case 232 /* VariableDeclaration */:
                     return true;
             }
         }
@@ -8532,8 +8571,8 @@ var ts;
     }
     ts.isVariableLikeOrAccessor = isVariableLikeOrAccessor;
     function isVariableDeclarationInVariableStatement(node) {
-        return node.parent.kind === 233
-            && node.parent.parent.kind === 214;
+        return node.parent.kind === 233 /* VariableDeclarationList */
+            && node.parent.parent.kind === 214 /* VariableStatement */;
     }
     ts.isVariableDeclarationInVariableStatement = isVariableDeclarationInVariableStatement;
     function isValidESSymbolDeclaration(node) {
@@ -8544,13 +8583,13 @@ var ts;
     ts.isValidESSymbolDeclaration = isValidESSymbolDeclaration;
     function introducesArgumentsExoticObject(node) {
         switch (node.kind) {
-            case 154:
-            case 153:
-            case 155:
-            case 156:
-            case 157:
-            case 234:
-            case 192:
+            case 154 /* MethodDeclaration */:
+            case 153 /* MethodSignature */:
+            case 155 /* Constructor */:
+            case 156 /* GetAccessor */:
+            case 157 /* SetAccessor */:
+            case 234 /* FunctionDeclaration */:
+            case 192 /* FunctionExpression */:
                 return true;
         }
         return false;
@@ -8561,7 +8600,7 @@ var ts;
             if (beforeUnwrapLabelCallback) {
                 beforeUnwrapLabelCallback(node);
             }
-            if (node.statement.kind !== 228) {
+            if (node.statement.kind !== 228 /* LabeledStatement */) {
                 return node.statement;
             }
             node = node.statement;
@@ -8569,30 +8608,30 @@ var ts;
     }
     ts.unwrapInnermostStatementOfLabel = unwrapInnermostStatementOfLabel;
     function isFunctionBlock(node) {
-        return node && node.kind === 213 && ts.isFunctionLike(node.parent);
+        return node && node.kind === 213 /* Block */ && ts.isFunctionLike(node.parent);
     }
     ts.isFunctionBlock = isFunctionBlock;
     function isObjectLiteralMethod(node) {
-        return node && node.kind === 154 && node.parent.kind === 184;
+        return node && node.kind === 154 /* MethodDeclaration */ && node.parent.kind === 184 /* ObjectLiteralExpression */;
     }
     ts.isObjectLiteralMethod = isObjectLiteralMethod;
     function isObjectLiteralOrClassExpressionMethod(node) {
-        return node.kind === 154 &&
-            (node.parent.kind === 184 ||
-                node.parent.kind === 205);
+        return node.kind === 154 /* MethodDeclaration */ &&
+            (node.parent.kind === 184 /* ObjectLiteralExpression */ ||
+                node.parent.kind === 205 /* ClassExpression */);
     }
     ts.isObjectLiteralOrClassExpressionMethod = isObjectLiteralOrClassExpressionMethod;
     function isIdentifierTypePredicate(predicate) {
-        return predicate && predicate.kind === 1;
+        return predicate && predicate.kind === 1 /* Identifier */;
     }
     ts.isIdentifierTypePredicate = isIdentifierTypePredicate;
     function isThisTypePredicate(predicate) {
-        return predicate && predicate.kind === 0;
+        return predicate && predicate.kind === 0 /* This */;
     }
     ts.isThisTypePredicate = isThisTypePredicate;
     function getPropertyAssignment(objectLiteral, key, key2) {
         return objectLiteral.properties.filter(function (property) {
-            if (property.kind === 270) {
+            if (property.kind === 270 /* PropertyAssignment */) {
                 var propName = getTextOfPropertyName(property.name);
                 return key === propName || (!!key2 && key2 === propName);
             }
@@ -8621,72 +8660,95 @@ var ts;
     }
     ts.getTsConfigPropArray = getTsConfigPropArray;
     function getContainingFunction(node) {
-        return ts.findAncestor(node.parent, ts.isFunctionLike);
+        return findAncestor(node.parent, ts.isFunctionLike);
     }
     ts.getContainingFunction = getContainingFunction;
     function getContainingClass(node) {
-        return ts.findAncestor(node.parent, ts.isClassLike);
+        return findAncestor(node.parent, ts.isClassLike);
     }
     ts.getContainingClass = getContainingClass;
     function getThisContainer(node, includeArrowFunctions) {
-        ts.Debug.assert(node.kind !== 274);
+        ts.Debug.assert(node.kind !== 274 /* SourceFile */);
         while (true) {
             node = node.parent;
             if (!node) {
-                return ts.Debug.fail();
+                return ts.Debug.fail(); // If we never pass in a SourceFile, this should be unreachable, since we'll stop when we reach that.
             }
             switch (node.kind) {
-                case 147:
+                case 147 /* ComputedPropertyName */:
+                    // If the grandparent node is an object literal (as opposed to a class),
+                    // then the computed property is not a 'this' container.
+                    // A computed property name in a class needs to be a this container
+                    // so that we can error on it.
                     if (ts.isClassLike(node.parent.parent)) {
                         return node;
                     }
+                    // If this is a computed property, then the parent should not
+                    // make it a this container. The parent might be a property
+                    // in an object literal, like a method or accessor. But in order for
+                    // such a parent to be a this container, the reference must be in
+                    // the *body* of the container.
                     node = node.parent;
                     break;
-                case 150:
-                    if (node.parent.kind === 149 && ts.isClassElement(node.parent.parent)) {
+                case 150 /* Decorator */:
+                    // Decorators are always applied outside of the body of a class or method.
+                    if (node.parent.kind === 149 /* Parameter */ && ts.isClassElement(node.parent.parent)) {
+                        // If the decorator's parent is a Parameter, we resolve the this container from
+                        // the grandparent class declaration.
                         node = node.parent.parent;
                     }
                     else if (ts.isClassElement(node.parent)) {
+                        // If the decorator's parent is a class element, we resolve the 'this' container
+                        // from the parent class declaration.
                         node = node.parent;
                     }
                     break;
-                case 193:
+                case 193 /* ArrowFunction */:
                     if (!includeArrowFunctions) {
                         continue;
                     }
-                case 234:
-                case 192:
-                case 239:
-                case 152:
-                case 151:
-                case 154:
-                case 153:
-                case 155:
-                case 156:
-                case 157:
-                case 158:
-                case 159:
-                case 160:
-                case 238:
-                case 274:
+                // falls through
+                case 234 /* FunctionDeclaration */:
+                case 192 /* FunctionExpression */:
+                case 239 /* ModuleDeclaration */:
+                case 152 /* PropertyDeclaration */:
+                case 151 /* PropertySignature */:
+                case 154 /* MethodDeclaration */:
+                case 153 /* MethodSignature */:
+                case 155 /* Constructor */:
+                case 156 /* GetAccessor */:
+                case 157 /* SetAccessor */:
+                case 158 /* CallSignature */:
+                case 159 /* ConstructSignature */:
+                case 160 /* IndexSignature */:
+                case 238 /* EnumDeclaration */:
+                case 274 /* SourceFile */:
                     return node;
             }
         }
     }
     ts.getThisContainer = getThisContainer;
     function getNewTargetContainer(node) {
-        var container = getThisContainer(node, false);
+        var container = getThisContainer(node, /*includeArrowFunctions*/ false);
         if (container) {
             switch (container.kind) {
-                case 155:
-                case 234:
-                case 192:
+                case 155 /* Constructor */:
+                case 234 /* FunctionDeclaration */:
+                case 192 /* FunctionExpression */:
                     return container;
             }
         }
         return undefined;
     }
     ts.getNewTargetContainer = getNewTargetContainer;
+    /**
+     * Given an super call/property node, returns the closest node where
+     * - a super call/property access is legal in the node and not legal in the parent node the node.
+     *   i.e. super call is legal in constructor but not legal in the class body.
+     * - the container is an arrow function (so caller might need to call getSuperContainer again in case it needs to climb higher)
+     * - a super call/property is definitely illegal in the container (but might be legal in some subnode)
+     *   i.e. super property access is illegal in function declaration but can be legal in the statement list
+     */
     function getSuperContainer(node, stopOnFunctions) {
         while (true) {
             node = node.parent;
@@ -8694,28 +8756,34 @@ var ts;
                 return node;
             }
             switch (node.kind) {
-                case 147:
+                case 147 /* ComputedPropertyName */:
                     node = node.parent;
                     break;
-                case 234:
-                case 192:
-                case 193:
+                case 234 /* FunctionDeclaration */:
+                case 192 /* FunctionExpression */:
+                case 193 /* ArrowFunction */:
                     if (!stopOnFunctions) {
                         continue;
                     }
-                case 152:
-                case 151:
-                case 154:
-                case 153:
-                case 155:
-                case 156:
-                case 157:
+                // falls through
+                case 152 /* PropertyDeclaration */:
+                case 151 /* PropertySignature */:
+                case 154 /* MethodDeclaration */:
+                case 153 /* MethodSignature */:
+                case 155 /* Constructor */:
+                case 156 /* GetAccessor */:
+                case 157 /* SetAccessor */:
                     return node;
-                case 150:
-                    if (node.parent.kind === 149 && ts.isClassElement(node.parent.parent)) {
+                case 150 /* Decorator */:
+                    // Decorators are always applied outside of the body of a class or method.
+                    if (node.parent.kind === 149 /* Parameter */ && ts.isClassElement(node.parent.parent)) {
+                        // If the decorator's parent is a Parameter, we resolve the this container from
+                        // the grandparent class declaration.
                         node = node.parent.parent;
                     }
                     else if (ts.isClassElement(node.parent)) {
+                        // If the decorator's parent is a class element, we resolve the 'this' container
+                        // from the parent class declaration.
                         node = node.parent;
                     }
                     break;
@@ -8724,41 +8792,47 @@ var ts;
     }
     ts.getSuperContainer = getSuperContainer;
     function getImmediatelyInvokedFunctionExpression(func) {
-        if (func.kind === 192 || func.kind === 193) {
+        if (func.kind === 192 /* FunctionExpression */ || func.kind === 193 /* ArrowFunction */) {
             var prev = func;
             var parent = func.parent;
-            while (parent.kind === 191) {
+            while (parent.kind === 191 /* ParenthesizedExpression */) {
                 prev = parent;
                 parent = parent.parent;
             }
-            if (parent.kind === 187 && parent.expression === prev) {
+            if (parent.kind === 187 /* CallExpression */ && parent.expression === prev) {
                 return parent;
             }
         }
     }
     ts.getImmediatelyInvokedFunctionExpression = getImmediatelyInvokedFunctionExpression;
+    /**
+     * Determines whether a node is a property or element access expression for `super`.
+     */
     function isSuperProperty(node) {
         var kind = node.kind;
-        return (kind === 185 || kind === 186)
-            && node.expression.kind === 97;
+        return (kind === 185 /* PropertyAccessExpression */ || kind === 186 /* ElementAccessExpression */)
+            && node.expression.kind === 97 /* SuperKeyword */;
     }
     ts.isSuperProperty = isSuperProperty;
+    /**
+     * Determines whether a node is a property or element access expression for `this`.
+     */
     function isThisProperty(node) {
         var kind = node.kind;
-        return (kind === 185 || kind === 186)
-            && node.expression.kind === 99;
+        return (kind === 185 /* PropertyAccessExpression */ || kind === 186 /* ElementAccessExpression */)
+            && node.expression.kind === 99 /* ThisKeyword */;
     }
     ts.isThisProperty = isThisProperty;
     function getEntityNameFromTypeNode(node) {
         switch (node.kind) {
-            case 162:
+            case 162 /* TypeReference */:
                 return node.typeName;
-            case 207:
+            case 207 /* ExpressionWithTypeArguments */:
                 return isEntityNameExpression(node.expression)
                     ? node.expression
                     : undefined;
-            case 71:
-            case 146:
+            case 71 /* Identifier */:
+            case 146 /* QualifiedName */:
                 return node;
         }
         return undefined;
@@ -8766,10 +8840,10 @@ var ts;
     ts.getEntityNameFromTypeNode = getEntityNameFromTypeNode;
     function getInvokedExpression(node) {
         switch (node.kind) {
-            case 189:
+            case 189 /* TaggedTemplateExpression */:
                 return node.tag;
-            case 257:
-            case 256:
+            case 257 /* JsxOpeningElement */:
+            case 256 /* JsxSelfClosingElement */:
                 return node.tagName;
             default:
                 return node.expression;
@@ -8778,41 +8852,45 @@ var ts;
     ts.getInvokedExpression = getInvokedExpression;
     function nodeCanBeDecorated(node, parent, grandparent) {
         switch (node.kind) {
-            case 235:
+            case 235 /* ClassDeclaration */:
+                // classes are valid targets
                 return true;
-            case 152:
-                return parent.kind === 235;
-            case 156:
-            case 157:
-            case 154:
+            case 152 /* PropertyDeclaration */:
+                // property declarations are valid if their parent is a class declaration.
+                return parent.kind === 235 /* ClassDeclaration */;
+            case 156 /* GetAccessor */:
+            case 157 /* SetAccessor */:
+            case 154 /* MethodDeclaration */:
+                // if this method has a body and its parent is a class declaration, this is a valid target.
                 return node.body !== undefined
-                    && parent.kind === 235;
-            case 149:
+                    && parent.kind === 235 /* ClassDeclaration */;
+            case 149 /* Parameter */:
+                // if the parameter's parent has a body and its grandparent is a class declaration, this is a valid target;
                 return parent.body !== undefined
-                    && (parent.kind === 155
-                        || parent.kind === 154
-                        || parent.kind === 157)
-                    && grandparent.kind === 235;
+                    && (parent.kind === 155 /* Constructor */
+                        || parent.kind === 154 /* MethodDeclaration */
+                        || parent.kind === 157 /* SetAccessor */)
+                    && grandparent.kind === 235 /* ClassDeclaration */;
         }
         return false;
     }
     ts.nodeCanBeDecorated = nodeCanBeDecorated;
     function nodeIsDecorated(node, parent, grandparent) {
         return node.decorators !== undefined
-            && nodeCanBeDecorated(node, parent, grandparent);
+            && nodeCanBeDecorated(node, parent, grandparent); // TODO: GH#18217
     }
     ts.nodeIsDecorated = nodeIsDecorated;
     function nodeOrChildIsDecorated(node, parent, grandparent) {
-        return nodeIsDecorated(node, parent, grandparent) || childIsDecorated(node, parent);
+        return nodeIsDecorated(node, parent, grandparent) || childIsDecorated(node, parent); // TODO: GH#18217
     }
     ts.nodeOrChildIsDecorated = nodeOrChildIsDecorated;
     function childIsDecorated(node, parent) {
         switch (node.kind) {
-            case 235:
-                return ts.some(node.members, function (m) { return nodeOrChildIsDecorated(m, node, parent); });
-            case 154:
-            case 157:
-                return ts.some(node.parameters, function (p) { return nodeIsDecorated(p, node, parent); });
+            case 235 /* ClassDeclaration */:
+                return ts.some(node.members, function (m) { return nodeOrChildIsDecorated(m, node, parent); }); // TODO: GH#18217
+            case 154 /* MethodDeclaration */:
+            case 157 /* SetAccessor */:
+                return ts.some(node.parameters, function (p) { return nodeIsDecorated(p, node, parent); }); // TODO: GH#18217
             default:
                 return false;
         }
@@ -8820,9 +8898,9 @@ var ts;
     ts.childIsDecorated = childIsDecorated;
     function isJSXTagName(node) {
         var parent = node.parent;
-        if (parent.kind === 257 ||
-            parent.kind === 256 ||
-            parent.kind === 258) {
+        if (parent.kind === 257 /* JsxOpeningElement */ ||
+            parent.kind === 256 /* JsxSelfClosingElement */ ||
+            parent.kind === 258 /* JsxClosingElement */) {
             return parent.tagName === node;
         }
         return false;
@@ -8830,55 +8908,56 @@ var ts;
     ts.isJSXTagName = isJSXTagName;
     function isExpressionNode(node) {
         switch (node.kind) {
-            case 97:
-            case 95:
-            case 101:
-            case 86:
-            case 12:
-            case 183:
-            case 184:
-            case 185:
-            case 186:
-            case 187:
-            case 188:
-            case 189:
-            case 208:
-            case 190:
-            case 209:
-            case 191:
-            case 192:
-            case 205:
-            case 193:
-            case 196:
-            case 194:
-            case 195:
-            case 198:
-            case 199:
-            case 200:
-            case 201:
-            case 204:
-            case 202:
-            case 13:
-            case 206:
-            case 255:
-            case 256:
-            case 259:
-            case 203:
-            case 197:
-            case 210:
+            case 97 /* SuperKeyword */:
+            case 95 /* NullKeyword */:
+            case 101 /* TrueKeyword */:
+            case 86 /* FalseKeyword */:
+            case 12 /* RegularExpressionLiteral */:
+            case 183 /* ArrayLiteralExpression */:
+            case 184 /* ObjectLiteralExpression */:
+            case 185 /* PropertyAccessExpression */:
+            case 186 /* ElementAccessExpression */:
+            case 187 /* CallExpression */:
+            case 188 /* NewExpression */:
+            case 189 /* TaggedTemplateExpression */:
+            case 208 /* AsExpression */:
+            case 190 /* TypeAssertionExpression */:
+            case 209 /* NonNullExpression */:
+            case 191 /* ParenthesizedExpression */:
+            case 192 /* FunctionExpression */:
+            case 205 /* ClassExpression */:
+            case 193 /* ArrowFunction */:
+            case 196 /* VoidExpression */:
+            case 194 /* DeleteExpression */:
+            case 195 /* TypeOfExpression */:
+            case 198 /* PrefixUnaryExpression */:
+            case 199 /* PostfixUnaryExpression */:
+            case 200 /* BinaryExpression */:
+            case 201 /* ConditionalExpression */:
+            case 204 /* SpreadElement */:
+            case 202 /* TemplateExpression */:
+            case 13 /* NoSubstitutionTemplateLiteral */:
+            case 206 /* OmittedExpression */:
+            case 255 /* JsxElement */:
+            case 256 /* JsxSelfClosingElement */:
+            case 259 /* JsxFragment */:
+            case 203 /* YieldExpression */:
+            case 197 /* AwaitExpression */:
+            case 210 /* MetaProperty */:
                 return true;
-            case 146:
-                while (node.parent.kind === 146) {
+            case 146 /* QualifiedName */:
+                while (node.parent.kind === 146 /* QualifiedName */) {
                     node = node.parent;
                 }
-                return node.parent.kind === 165 || isJSXTagName(node);
-            case 71:
-                if (node.parent.kind === 165 || isJSXTagName(node)) {
+                return node.parent.kind === 165 /* TypeQuery */ || isJSXTagName(node);
+            case 71 /* Identifier */:
+                if (node.parent.kind === 165 /* TypeQuery */ || isJSXTagName(node)) {
                     return true;
                 }
-            case 8:
-            case 9:
-            case 99:
+            // falls through
+            case 8 /* NumericLiteral */:
+            case 9 /* StringLiteral */:
+            case 99 /* ThisKeyword */:
                 return isInExpressionContext(node);
             default:
                 return false;
@@ -8888,47 +8967,47 @@ var ts;
     function isInExpressionContext(node) {
         var parent = node.parent;
         switch (parent.kind) {
-            case 232:
-            case 149:
-            case 152:
-            case 151:
-            case 273:
-            case 270:
-            case 182:
+            case 232 /* VariableDeclaration */:
+            case 149 /* Parameter */:
+            case 152 /* PropertyDeclaration */:
+            case 151 /* PropertySignature */:
+            case 273 /* EnumMember */:
+            case 270 /* PropertyAssignment */:
+            case 182 /* BindingElement */:
                 return parent.initializer === node;
-            case 216:
-            case 217:
-            case 218:
-            case 219:
-            case 225:
-            case 226:
-            case 227:
-            case 266:
-            case 229:
+            case 216 /* ExpressionStatement */:
+            case 217 /* IfStatement */:
+            case 218 /* DoStatement */:
+            case 219 /* WhileStatement */:
+            case 225 /* ReturnStatement */:
+            case 226 /* WithStatement */:
+            case 227 /* SwitchStatement */:
+            case 266 /* CaseClause */:
+            case 229 /* ThrowStatement */:
                 return parent.expression === node;
-            case 220:
+            case 220 /* ForStatement */:
                 var forStatement = parent;
-                return (forStatement.initializer === node && forStatement.initializer.kind !== 233) ||
+                return (forStatement.initializer === node && forStatement.initializer.kind !== 233 /* VariableDeclarationList */) ||
                     forStatement.condition === node ||
                     forStatement.incrementor === node;
-            case 221:
-            case 222:
+            case 221 /* ForInStatement */:
+            case 222 /* ForOfStatement */:
                 var forInStatement = parent;
-                return (forInStatement.initializer === node && forInStatement.initializer.kind !== 233) ||
+                return (forInStatement.initializer === node && forInStatement.initializer.kind !== 233 /* VariableDeclarationList */) ||
                     forInStatement.expression === node;
-            case 190:
-            case 208:
+            case 190 /* TypeAssertionExpression */:
+            case 208 /* AsExpression */:
                 return node === parent.expression;
-            case 211:
+            case 211 /* TemplateSpan */:
                 return node === parent.expression;
-            case 147:
+            case 147 /* ComputedPropertyName */:
                 return node === parent.expression;
-            case 150:
-            case 265:
-            case 264:
-            case 272:
+            case 150 /* Decorator */:
+            case 265 /* JsxExpression */:
+            case 264 /* JsxSpreadAttribute */:
+            case 272 /* SpreadAssignment */:
                 return true;
-            case 207:
+            case 207 /* ExpressionWithTypeArguments */:
                 return parent.expression === node && isExpressionWithTypeArgumentsInClassExtendsClause(parent);
             default:
                 return isExpressionNode(parent);
@@ -8936,7 +9015,7 @@ var ts;
     }
     ts.isInExpressionContext = isInExpressionContext;
     function isExternalModuleImportEqualsDeclaration(node) {
-        return node.kind === 243 && node.moduleReference.kind === 254;
+        return node.kind === 243 /* ImportEqualsDeclaration */ && node.moduleReference.kind === 254 /* ExternalModuleReference */;
     }
     ts.isExternalModuleImportEqualsDeclaration = isExternalModuleImportEqualsDeclaration;
     function getExternalModuleImportEqualsDeclarationExpression(node) {
@@ -8945,7 +9024,7 @@ var ts;
     }
     ts.getExternalModuleImportEqualsDeclarationExpression = getExternalModuleImportEqualsDeclarationExpression;
     function isInternalModuleImportEqualsDeclaration(node) {
-        return node.kind === 243 && node.moduleReference.kind !== 254;
+        return node.kind === 243 /* ImportEqualsDeclaration */ && node.moduleReference.kind !== 254 /* ExternalModuleReference */;
     }
     ts.isInternalModuleImportEqualsDeclaration = isInternalModuleImportEqualsDeclaration;
     function isSourceFileJavaScript(file) {
@@ -8957,15 +9036,15 @@ var ts;
     }
     ts.isSourceFileNotJavaScript = isSourceFileNotJavaScript;
     function isInJavaScriptFile(node) {
-        return !!node && !!(node.flags & 65536);
+        return !!node && !!(node.flags & 65536 /* JavaScriptFile */);
     }
     ts.isInJavaScriptFile = isInJavaScriptFile;
     function isInJsonFile(node) {
-        return !!node && !!(node.flags & 16777216);
+        return !!node && !!(node.flags & 16777216 /* JsonFile */);
     }
     ts.isInJsonFile = isInJsonFile;
     function isInJSDoc(node) {
-        return !!node && !!(node.flags & 2097152);
+        return !!node && !!(node.flags & 2097152 /* JSDoc */);
     }
     ts.isInJSDoc = isInJSDoc;
     function isJSDocIndexSignature(node) {
@@ -8973,15 +9052,15 @@ var ts;
             ts.isIdentifier(node.typeName) &&
             node.typeName.escapedText === "Object" &&
             node.typeArguments && node.typeArguments.length === 2 &&
-            (node.typeArguments[0].kind === 137 || node.typeArguments[0].kind === 134);
+            (node.typeArguments[0].kind === 137 /* StringKeyword */ || node.typeArguments[0].kind === 134 /* NumberKeyword */);
     }
     ts.isJSDocIndexSignature = isJSDocIndexSignature;
     function isRequireCall(callExpression, checkArgumentIsStringLiteralLike) {
-        if (callExpression.kind !== 187) {
+        if (callExpression.kind !== 187 /* CallExpression */) {
             return false;
         }
         var _a = callExpression, expression = _a.expression, args = _a.arguments;
-        if (expression.kind !== 71 || expression.escapedText !== "require") {
+        if (expression.kind !== 71 /* Identifier */ || expression.escapedText !== "require") {
             return false;
         }
         if (args.length !== 1) {
@@ -8992,11 +9071,11 @@ var ts;
     }
     ts.isRequireCall = isRequireCall;
     function isSingleOrDoubleQuote(charCode) {
-        return charCode === 39 || charCode === 34;
+        return charCode === 39 /* singleQuote */ || charCode === 34 /* doubleQuote */;
     }
     ts.isSingleOrDoubleQuote = isSingleOrDoubleQuote;
     function isStringDoubleQuoted(str, sourceFile) {
-        return getSourceTextOfNodeFromSourceFile(sourceFile, str).charCodeAt(0) === 34;
+        return getSourceTextOfNodeFromSourceFile(sourceFile, str).charCodeAt(0) === 34 /* doubleQuote */;
     }
     ts.isStringDoubleQuoted = isStringDoubleQuoted;
     function getDeclarationOfJSInitializer(node) {
@@ -9009,16 +9088,16 @@ var ts;
             name = node.parent.name;
             decl = node.parent;
         }
-        else if (ts.isBinaryExpression(node.parent) && node.parent.operatorToken.kind === 58 && node.parent.right === node) {
+        else if (ts.isBinaryExpression(node.parent) && node.parent.operatorToken.kind === 58 /* EqualsToken */ && node.parent.right === node) {
             name = node.parent.left;
             decl = name;
         }
-        else if (ts.isBinaryExpression(node.parent) && node.parent.operatorToken.kind === 54) {
+        else if (ts.isBinaryExpression(node.parent) && node.parent.operatorToken.kind === 54 /* BarBarToken */) {
             if (ts.isVariableDeclaration(node.parent.parent) && node.parent.parent.initializer === node.parent) {
                 name = node.parent.parent.name;
                 decl = node.parent.parent;
             }
-            else if (ts.isBinaryExpression(node.parent.parent) && node.parent.parent.operatorToken.kind === 58 && node.parent.parent.right === node.parent) {
+            else if (ts.isBinaryExpression(node.parent.parent) && node.parent.parent.operatorToken.kind === 58 /* EqualsToken */ && node.parent.parent.right === node.parent) {
                 name = node.parent.parent.left;
                 decl = name;
             }
@@ -9032,31 +9111,46 @@ var ts;
         return decl;
     }
     ts.getDeclarationOfJSInitializer = getDeclarationOfJSInitializer;
+    /** Get the initializer, taking into account defaulted Javascript initializers */
     function getEffectiveInitializer(node) {
         if (isInJavaScriptFile(node) && node.initializer &&
-            ts.isBinaryExpression(node.initializer) && node.initializer.operatorToken.kind === 54 &&
+            ts.isBinaryExpression(node.initializer) && node.initializer.operatorToken.kind === 54 /* BarBarToken */ &&
             node.name && isEntityNameExpression(node.name) && isSameEntityName(node.name, node.initializer.left)) {
             return node.initializer.right;
         }
         return node.initializer;
     }
     ts.getEffectiveInitializer = getEffectiveInitializer;
+    /**
+     * Get the assignment 'initializer' -- the righthand side-- when the initializer is container-like (See getJavascriptInitializer).
+     * We treat the right hand side of assignments with container-like initalizers as declarations.
+     */
     function getAssignedJavascriptInitializer(node) {
-        if (node && node.parent && ts.isBinaryExpression(node.parent) && node.parent.operatorToken.kind === 58) {
+        if (node && node.parent && ts.isBinaryExpression(node.parent) && node.parent.operatorToken.kind === 58 /* EqualsToken */) {
             var isPrototypeAssignment = isPrototypeAccess(node.parent.left);
             return getJavascriptInitializer(node.parent.right, isPrototypeAssignment) ||
                 getDefaultedJavascriptInitializer(node.parent.left, node.parent.right, isPrototypeAssignment);
         }
     }
     ts.getAssignedJavascriptInitializer = getAssignedJavascriptInitializer;
+    /**
+     * Recognized Javascript container-like initializers are:
+     * 1. (function() {})() -- IIFEs
+     * 2. function() { } -- Function expressions
+     * 3. class { } -- Class expressions
+     * 4. {} -- Empty object literals
+     * 5. { ... } -- Non-empty object literals, when used to initialize a prototype, like `C.prototype = { m() { } }`
+     *
+     * This function returns the provided initializer, or undefined if it is not valid.
+     */
     function getJavascriptInitializer(initializer, isPrototypeAssignment) {
         if (ts.isCallExpression(initializer)) {
             var e = skipParentheses(initializer.expression);
-            return e.kind === 192 || e.kind === 193 ? initializer : undefined;
+            return e.kind === 192 /* FunctionExpression */ || e.kind === 193 /* ArrowFunction */ ? initializer : undefined;
         }
-        if (initializer.kind === 192 ||
-            initializer.kind === 205 ||
-            initializer.kind === 193) {
+        if (initializer.kind === 192 /* FunctionExpression */ ||
+            initializer.kind === 205 /* ClassExpression */ ||
+            initializer.kind === 193 /* ArrowFunction */) {
             return initializer;
         }
         if (ts.isObjectLiteralExpression(initializer) && (initializer.properties.length === 0 || isPrototypeAssignment)) {
@@ -9064,23 +9158,32 @@ var ts;
         }
     }
     ts.getJavascriptInitializer = getJavascriptInitializer;
+    /**
+     * A defaulted Javascript initializer matches the pattern
+     * `Lhs = Lhs || JavascriptInitializer`
+     * or `var Lhs = Lhs || JavascriptInitializer`
+     *
+     * The second Lhs is required to be the same as the first except that it may be prefixed with
+     * 'window.', 'global.' or 'self.' The second Lhs is otherwise ignored by the binder and checker.
+     */
     function getDefaultedJavascriptInitializer(name, initializer, isPrototypeAssignment) {
-        var e = ts.isBinaryExpression(initializer) && initializer.operatorToken.kind === 54 && getJavascriptInitializer(initializer.right, isPrototypeAssignment);
+        var e = ts.isBinaryExpression(initializer) && initializer.operatorToken.kind === 54 /* BarBarToken */ && getJavascriptInitializer(initializer.right, isPrototypeAssignment);
         if (e && isSameEntityName(name, initializer.left)) {
             return e;
         }
     }
     function isDefaultedJavascriptInitializer(node) {
         var name = ts.isVariableDeclaration(node.parent) ? node.parent.name :
-            ts.isBinaryExpression(node.parent) && node.parent.operatorToken.kind === 58 ? node.parent.left :
+            ts.isBinaryExpression(node.parent) && node.parent.operatorToken.kind === 58 /* EqualsToken */ ? node.parent.left :
                 undefined;
         return name && getJavascriptInitializer(node.right, isPrototypeAccess(name)) && isEntityNameExpression(name) && isSameEntityName(name, node.left);
     }
     ts.isDefaultedJavascriptInitializer = isDefaultedJavascriptInitializer;
+    /** Given a Javascript initializer, return the outer name. That is, the lhs of the assignment or the declaration name. */
     function getOuterNameOfJsInitializer(node) {
         if (ts.isBinaryExpression(node.parent)) {
-            var parent = (node.parent.operatorToken.kind === 54 && ts.isBinaryExpression(node.parent.parent)) ? node.parent.parent : node.parent;
-            if (parent.operatorToken.kind === 58 && ts.isIdentifier(parent.left)) {
+            var parent = (node.parent.operatorToken.kind === 54 /* BarBarToken */ && ts.isBinaryExpression(node.parent.parent)) ? node.parent.parent : node.parent;
+            if (parent.operatorToken.kind === 58 /* EqualsToken */ && ts.isIdentifier(parent.left)) {
                 return parent.left;
             }
         }
@@ -9089,12 +9192,21 @@ var ts;
         }
     }
     ts.getOuterNameOfJsInitializer = getOuterNameOfJsInitializer;
+    /**
+     * Is the 'declared' name the same as the one in the initializer?
+     * @return true for identical entity names, as well as ones where the initializer is prefixed with
+     * 'window', 'self' or 'global'. For example:
+     *
+     * var my = my || {}
+     * var min = window.min || {}
+     * my.app = self.my.app || class { }
+     */
     function isSameEntityName(name, initializer) {
         if (ts.isIdentifier(name) && ts.isIdentifier(initializer)) {
             return name.escapedText === initializer.escapedText;
         }
         if (ts.isIdentifier(name) && ts.isPropertyAccessExpression(initializer)) {
-            return (initializer.expression.kind === 99 ||
+            return (initializer.expression.kind === 99 /* ThisKeyword */ ||
                 ts.isIdentifier(initializer.expression) &&
                     (initializer.expression.escapedText === "window" ||
                         initializer.expression.escapedText === "self" ||
@@ -9107,7 +9219,7 @@ var ts;
         return false;
     }
     function getRightMostAssignedExpression(node) {
-        while (isAssignmentExpression(node, true)) {
+        while (isAssignmentExpression(node, /*excludeCompoundAssignements*/ true)) {
             node = node.right;
         }
         return node;
@@ -9121,25 +9233,30 @@ var ts;
         return ts.isPropertyAccessExpression(node) && ts.isIdentifier(node.expression) && node.expression.escapedText === "module" && node.name.escapedText === "exports";
     }
     ts.isModuleExportsPropertyAccessExpression = isModuleExportsPropertyAccessExpression;
+    /// Given a BinaryExpression, returns SpecialPropertyAssignmentKind for the various kinds of property
+    /// assignments we treat as special in the binder
     function getSpecialPropertyAssignmentKind(expr) {
         if (!isInJavaScriptFile(expr) ||
-            expr.operatorToken.kind !== 58 ||
+            expr.operatorToken.kind !== 58 /* EqualsToken */ ||
             !ts.isPropertyAccessExpression(expr.left)) {
-            return 0;
+            return 0 /* None */;
         }
         var lhs = expr.left;
-        if (lhs.expression.kind === 99) {
-            return 4;
+        if (lhs.expression.kind === 99 /* ThisKeyword */) {
+            return 4 /* ThisProperty */;
         }
         else if (ts.isIdentifier(lhs.expression) && lhs.expression.escapedText === "module" && lhs.name.escapedText === "exports") {
-            return 2;
+            // module.exports = expr
+            return 2 /* ModuleExports */;
         }
         else if (isEntityNameExpression(lhs.expression)) {
             if (lhs.name.escapedText === "prototype" && ts.isObjectLiteralExpression(getInitializerOfBinaryExpression(expr))) {
-                return 6;
+                // F.prototype = { ... }
+                return 6 /* Prototype */;
             }
             else if (isPrototypeAccess(lhs.expression)) {
-                return 3;
+                // F.G....prototype.x = expr
+                return 3 /* PrototypeProperty */;
             }
             var nextToLast = lhs;
             while (ts.isPropertyAccessExpression(nextToLast.expression)) {
@@ -9149,11 +9266,13 @@ var ts;
             var id = nextToLast.expression;
             if (id.escapedText === "exports" ||
                 id.escapedText === "module" && nextToLast.name.escapedText === "exports") {
-                return 1;
+                // exports.name = expr OR module.exports.name = expr
+                return 1 /* ExportsProperty */;
             }
-            return 5;
+            // F.G...x = expr
+            return 5 /* Property */;
         }
-        return 0;
+        return 0 /* None */;
     }
     ts.getSpecialPropertyAssignmentKind = getSpecialPropertyAssignmentKind;
     function getInitializerOfBinaryExpression(expr) {
@@ -9164,12 +9283,12 @@ var ts;
     }
     ts.getInitializerOfBinaryExpression = getInitializerOfBinaryExpression;
     function isPrototypePropertyAssignment(node) {
-        return ts.isBinaryExpression(node) && getSpecialPropertyAssignmentKind(node) === 3;
+        return ts.isBinaryExpression(node) && getSpecialPropertyAssignmentKind(node) === 3 /* PrototypeProperty */;
     }
     ts.isPrototypePropertyAssignment = isPrototypePropertyAssignment;
     function isSpecialPropertyDeclaration(expr) {
         return isInJavaScriptFile(expr) &&
-            expr.parent && expr.parent.kind === 216 &&
+            expr.parent && expr.parent.kind === 216 /* ExpressionStatement */ &&
             !!ts.getJSDocTypeTag(expr.parent);
     }
     ts.isSpecialPropertyDeclaration = isSpecialPropertyDeclaration;
@@ -9179,14 +9298,14 @@ var ts;
     ts.importFromModuleSpecifier = importFromModuleSpecifier;
     function tryGetImportFromModuleSpecifier(node) {
         switch (node.parent.kind) {
-            case 244:
-            case 250:
+            case 244 /* ImportDeclaration */:
+            case 250 /* ExportDeclaration */:
                 return node.parent;
-            case 254:
+            case 254 /* ExternalModuleReference */:
                 return node.parent.parent;
-            case 187:
+            case 187 /* CallExpression */:
                 return node.parent;
-            case 178:
+            case 178 /* LiteralType */:
                 ts.Debug.assert(ts.isStringLiteral(node));
                 return ts.tryCast(node.parent.parent, ts.isImportTypeNode);
             default:
@@ -9196,12 +9315,12 @@ var ts;
     ts.tryGetImportFromModuleSpecifier = tryGetImportFromModuleSpecifier;
     function getExternalModuleName(node) {
         switch (node.kind) {
-            case 244:
-            case 250:
+            case 244 /* ImportDeclaration */:
+            case 250 /* ExportDeclaration */:
                 return node.moduleSpecifier;
-            case 243:
-                return node.moduleReference.kind === 254 ? node.moduleReference.expression : undefined;
-            case 179:
+            case 243 /* ImportEqualsDeclaration */:
+                return node.moduleReference.kind === 254 /* ExternalModuleReference */ ? node.moduleReference.expression : undefined;
+            case 179 /* ImportType */:
                 return isLiteralImportTypeNode(node) ? node.argument.literal : undefined;
             default:
                 return ts.Debug.assertNever(node);
@@ -9210,11 +9329,11 @@ var ts;
     ts.getExternalModuleName = getExternalModuleName;
     function getNamespaceDeclarationNode(node) {
         switch (node.kind) {
-            case 244:
+            case 244 /* ImportDeclaration */:
                 return node.importClause && ts.tryCast(node.importClause.namedBindings, ts.isNamespaceImport);
-            case 243:
+            case 243 /* ImportEqualsDeclaration */:
                 return node;
-            case 250:
+            case 250 /* ExportDeclaration */:
                 return undefined;
             default:
                 return ts.Debug.assertNever(node);
@@ -9222,19 +9341,19 @@ var ts;
     }
     ts.getNamespaceDeclarationNode = getNamespaceDeclarationNode;
     function isDefaultImport(node) {
-        return node.kind === 244 && !!node.importClause && !!node.importClause.name;
+        return node.kind === 244 /* ImportDeclaration */ && !!node.importClause && !!node.importClause.name;
     }
     ts.isDefaultImport = isDefaultImport;
     function hasQuestionToken(node) {
         if (node) {
             switch (node.kind) {
-                case 149:
-                case 154:
-                case 153:
-                case 271:
-                case 270:
-                case 152:
-                case 151:
+                case 149 /* Parameter */:
+                case 154 /* MethodDeclaration */:
+                case 153 /* MethodSignature */:
+                case 271 /* ShorthandPropertyAssignment */:
+                case 270 /* PropertyAssignment */:
+                case 152 /* PropertyDeclaration */:
+                case 151 /* PropertySignature */:
                     return node.questionToken !== undefined;
             }
         }
@@ -9242,14 +9361,14 @@ var ts;
     }
     ts.hasQuestionToken = hasQuestionToken;
     function isJSDocConstructSignature(node) {
-        return node.kind === 284 &&
+        return node.kind === 284 /* JSDocFunctionType */ &&
             node.parameters.length > 0 &&
             node.parameters[0].name &&
             node.parameters[0].name.escapedText === "new";
     }
     ts.isJSDocConstructSignature = isJSDocConstructSignature;
     function isJSDocTypeAlias(node) {
-        return node.kind === 297 || node.kind === 292;
+        return node.kind === 297 /* JSDocTypedefTag */ || node.kind === 292 /* JSDocCallbackTag */;
     }
     ts.isJSDocTypeAlias = isJSDocTypeAlias;
     function isTypeAlias(node) {
@@ -9259,27 +9378,27 @@ var ts;
     function getSourceOfAssignment(node) {
         return ts.isExpressionStatement(node) &&
             node.expression && ts.isBinaryExpression(node.expression) &&
-            node.expression.operatorToken.kind === 58
+            node.expression.operatorToken.kind === 58 /* EqualsToken */
             ? node.expression.right
             : undefined;
     }
     function getSourceOfDefaultedAssignment(node) {
         return ts.isExpressionStatement(node) &&
             ts.isBinaryExpression(node.expression) &&
-            getSpecialPropertyAssignmentKind(node.expression) !== 0 &&
+            getSpecialPropertyAssignmentKind(node.expression) !== 0 /* None */ &&
             ts.isBinaryExpression(node.expression.right) &&
-            node.expression.right.operatorToken.kind === 54
+            node.expression.right.operatorToken.kind === 54 /* BarBarToken */
             ? node.expression.right.right
             : undefined;
     }
     function getSingleInitializerOfVariableStatementOrPropertyDeclaration(node) {
         switch (node.kind) {
-            case 214:
+            case 214 /* VariableStatement */:
                 var v = getSingleVariableOfVariableStatement(node);
                 return v && v.initializer;
-            case 152:
+            case 152 /* PropertyDeclaration */:
                 return node.initializer;
-            case 270:
+            case 270 /* PropertyAssignment */:
                 return node.initializer;
         }
     }
@@ -9289,7 +9408,7 @@ var ts;
     function getNestedModuleDeclaration(node) {
         return ts.isModuleDeclaration(node) &&
             node.body &&
-            node.body.kind === 239
+            node.body.kind === 239 /* ModuleDeclaration */
             ? node.body
             : undefined;
     }
@@ -9301,9 +9420,15 @@ var ts;
             var parent = node.parent;
             if (!parent)
                 return;
-            if (parent.kind === 270 || parent.kind === 152 || getNestedModuleDeclaration(parent)) {
+            if (parent.kind === 270 /* PropertyAssignment */ || parent.kind === 152 /* PropertyDeclaration */ || getNestedModuleDeclaration(parent)) {
                 getJSDocCommentsAndTagsWorker(parent);
             }
+            // Try to recognize this pattern when node is initializer of variable declaration and JSDoc comments are on containing variable statement.
+            // /**
+            //   * @param {number} name
+            //   * @returns {number}
+            //   */
+            // var x = function(name) { return name.length; }
             if (parent.parent && (getSingleVariableOfVariableStatement(parent.parent) === node)) {
                 getJSDocCommentsAndTagsWorker(parent.parent);
             }
@@ -9313,12 +9438,13 @@ var ts;
                     getSourceOfDefaultedAssignment(parent.parent.parent))) {
                 getJSDocCommentsAndTagsWorker(parent.parent.parent);
             }
-            if (ts.isBinaryExpression(node) && node.operatorToken.kind === 58 ||
-                ts.isBinaryExpression(parent) && parent.operatorToken.kind === 58 ||
-                node.kind === 185 && node.parent && node.parent.kind === 216) {
+            if (ts.isBinaryExpression(node) && node.operatorToken.kind === 58 /* EqualsToken */ ||
+                ts.isBinaryExpression(parent) && parent.operatorToken.kind === 58 /* EqualsToken */ ||
+                node.kind === 185 /* PropertyAccessExpression */ && node.parent && node.parent.kind === 216 /* ExpressionStatement */) {
                 getJSDocCommentsAndTagsWorker(parent);
             }
-            if (node.kind === 149) {
+            // Pull parameter comments from declaring function as well
+            if (node.kind === 149 /* Parameter */) {
                 result = ts.addRange(result, ts.getJSDocParameterTags(node));
             }
             if (isVariableLike(node) && ts.hasInitializer(node) && node.initializer !== hostNode && ts.hasJSDocNodes(node.initializer)) {
@@ -9330,6 +9456,7 @@ var ts;
         }
     }
     ts.getJSDocCommentsAndTags = getJSDocCommentsAndTags;
+    /** Does the opposite of `getJSDocParameterTags`: given a JSDoc parameter, finds the parameter corresponding to it. */
     function getParameterSymbolFromJSDoc(node) {
         if (node.symbol) {
             return node.symbol;
@@ -9342,7 +9469,7 @@ var ts;
         if (!decl) {
             return undefined;
         }
-        var parameter = ts.find(decl.parameters, function (p) { return p.name.kind === 71 && p.name.escapedText === name; });
+        var parameter = ts.find(decl.parameters, function (p) { return p.name.kind === 71 /* Identifier */ && p.name.escapedText === name; });
         return parameter && parameter.symbol;
     }
     ts.getParameterSymbolFromJSDoc = getParameterSymbolFromJSDoc;
@@ -9361,7 +9488,7 @@ var ts;
     }
     ts.getHostSignatureFromJSDocHost = getHostSignatureFromJSDocHost;
     function getJSDocHost(node) {
-        return ts.Debug.assertDefined(ts.findAncestor(node.parent, ts.isJSDoc)).parent;
+        return ts.Debug.assertDefined(findAncestor(node.parent, ts.isJSDoc)).parent;
     }
     ts.getJSDocHost = getJSDocHost;
     function getTypeParameterFromJsDoc(node) {
@@ -9377,7 +9504,7 @@ var ts;
     ts.hasRestParameter = hasRestParameter;
     function isRestParameter(node) {
         var type = ts.isJSDocParameterTag(node) ? (node.typeExpression && node.typeExpression.type) : node.type;
-        return node.dotDotDotToken !== undefined || !!type && type.kind === 285;
+        return node.dotDotDotToken !== undefined || !!type && type.kind === 285 /* JSDocVariadicType */;
     }
     ts.isRestParameter = isRestParameter;
     var AssignmentKind;
@@ -9390,65 +9517,73 @@ var ts;
         var parent = node.parent;
         while (true) {
             switch (parent.kind) {
-                case 200:
+                case 200 /* BinaryExpression */:
                     var binaryOperator = parent.operatorToken.kind;
                     return isAssignmentOperator(binaryOperator) && parent.left === node ?
-                        binaryOperator === 58 ? 1 : 2 :
-                        0;
-                case 198:
-                case 199:
+                        binaryOperator === 58 /* EqualsToken */ ? 1 /* Definite */ : 2 /* Compound */ :
+                        0 /* None */;
+                case 198 /* PrefixUnaryExpression */:
+                case 199 /* PostfixUnaryExpression */:
                     var unaryOperator = parent.operator;
-                    return unaryOperator === 43 || unaryOperator === 44 ? 2 : 0;
-                case 221:
-                case 222:
-                    return parent.initializer === node ? 1 : 0;
-                case 191:
-                case 183:
-                case 204:
-                case 209:
+                    return unaryOperator === 43 /* PlusPlusToken */ || unaryOperator === 44 /* MinusMinusToken */ ? 2 /* Compound */ : 0 /* None */;
+                case 221 /* ForInStatement */:
+                case 222 /* ForOfStatement */:
+                    return parent.initializer === node ? 1 /* Definite */ : 0 /* None */;
+                case 191 /* ParenthesizedExpression */:
+                case 183 /* ArrayLiteralExpression */:
+                case 204 /* SpreadElement */:
+                case 209 /* NonNullExpression */:
                     node = parent;
                     break;
-                case 271:
+                case 271 /* ShorthandPropertyAssignment */:
                     if (parent.name !== node) {
-                        return 0;
+                        return 0 /* None */;
                     }
                     node = parent.parent;
                     break;
-                case 270:
+                case 270 /* PropertyAssignment */:
                     if (parent.name === node) {
-                        return 0;
+                        return 0 /* None */;
                     }
                     node = parent.parent;
                     break;
                 default:
-                    return 0;
+                    return 0 /* None */;
             }
             parent = node.parent;
         }
     }
     ts.getAssignmentTargetKind = getAssignmentTargetKind;
+    // A node is an assignment target if it is on the left hand side of an '=' token, if it is parented by a property
+    // assignment in an object literal that is an assignment target, or if it is parented by an array literal that is
+    // an assignment target. Examples include 'a = xxx', '{ p: a } = xxx', '[{ a }] = xxx'.
+    // (Note that `p` is not a target in the above examples, only `a`.)
     function isAssignmentTarget(node) {
-        return getAssignmentTargetKind(node) !== 0;
+        return getAssignmentTargetKind(node) !== 0 /* None */;
     }
     ts.isAssignmentTarget = isAssignmentTarget;
+    /**
+     * Indicates whether a node could contain a `var` VariableDeclarationList that contributes to
+     * the same `var` declaration scope as the node's parent.
+     */
     function isNodeWithPossibleHoistedDeclaration(node) {
         switch (node.kind) {
-            case 213:
-            case 214:
-            case 226:
-            case 217:
-            case 227:
-            case 241:
-            case 266:
-            case 267:
-            case 228:
-            case 220:
-            case 221:
-            case 222:
-            case 218:
-            case 219:
-            case 230:
-            case 269:
+            case 213 /* Block */:
+            case 214 /* VariableStatement */:
+            case 226 /* WithStatement */:
+            case 217 /* IfStatement */:
+            case 227 /* SwitchStatement */:
+            case 241 /* CaseBlock */:
+            case 266 /* CaseClause */:
+            case 267 /* DefaultClause */:
+            case 228 /* LabeledStatement */:
+            case 220 /* ForStatement */:
+            case 221 /* ForInStatement */:
+            case 222 /* ForOfStatement */:
+            case 218 /* DoStatement */:
+            case 219 /* WhileStatement */:
+            case 230 /* TryStatement */:
+            case 269 /* CatchClause */:
                 return true;
         }
         return false;
@@ -9465,26 +9600,27 @@ var ts;
         return node;
     }
     function walkUpParenthesizedTypes(node) {
-        return walkUp(node, 173);
+        return walkUp(node, 173 /* ParenthesizedType */);
     }
     ts.walkUpParenthesizedTypes = walkUpParenthesizedTypes;
     function walkUpParenthesizedExpressions(node) {
-        return walkUp(node, 191);
+        return walkUp(node, 191 /* ParenthesizedExpression */);
     }
     ts.walkUpParenthesizedExpressions = walkUpParenthesizedExpressions;
     function skipParentheses(node) {
-        while (node.kind === 191) {
+        while (node.kind === 191 /* ParenthesizedExpression */) {
             node = node.expression;
         }
         return node;
     }
     ts.skipParentheses = skipParentheses;
+    // a node is delete target iff. it is PropertyAccessExpression/ElementAccessExpression with parentheses skipped
     function isDeleteTarget(node) {
-        if (node.kind !== 185 && node.kind !== 186) {
+        if (node.kind !== 185 /* PropertyAccessExpression */ && node.kind !== 186 /* ElementAccessExpression */) {
             return false;
         }
         node = walkUpParenthesizedExpressions(node.parent);
-        return node && node.kind === 194;
+        return node && node.kind === 194 /* DeleteExpression */;
     }
     ts.isDeleteTarget = isDeleteTarget;
     function isNodeDescendantOf(node, ancestor) {
@@ -9496,15 +9632,17 @@ var ts;
         return false;
     }
     ts.isNodeDescendantOf = isNodeDescendantOf;
+    // True if `name` is the name of a declaration node
     function isDeclarationName(name) {
         return !ts.isSourceFile(name) && !ts.isBindingPattern(name) && ts.isDeclaration(name.parent) && name.parent.name === name;
     }
     ts.isDeclarationName = isDeclarationName;
+    // See GH#16030
     function isAnyDeclarationName(name) {
         switch (name.kind) {
-            case 71:
-            case 9:
-            case 8: {
+            case 71 /* Identifier */:
+            case 9 /* StringLiteral */:
+            case 8 /* NumericLiteral */: {
                 var parent = name.parent;
                 if (ts.isDeclaration(parent)) {
                     return parent.name === name;
@@ -9515,7 +9653,7 @@ var ts;
                 }
                 else {
                     var binExp = name.parent.parent;
-                    return ts.isBinaryExpression(binExp) && getSpecialPropertyAssignmentKind(binExp) !== 0 && ts.getNameOfDeclaration(binExp) === name;
+                    return ts.isBinaryExpression(binExp) && getSpecialPropertyAssignmentKind(binExp) !== 0 /* None */ && ts.getNameOfDeclaration(binExp) === name;
                 }
             }
             default:
@@ -9524,51 +9662,64 @@ var ts;
     }
     ts.isAnyDeclarationName = isAnyDeclarationName;
     function isLiteralComputedPropertyDeclarationName(node) {
-        return (node.kind === 9 || node.kind === 8) &&
-            node.parent.kind === 147 &&
+        return (node.kind === 9 /* StringLiteral */ || node.kind === 8 /* NumericLiteral */) &&
+            node.parent.kind === 147 /* ComputedPropertyName */ &&
             ts.isDeclaration(node.parent.parent);
     }
     ts.isLiteralComputedPropertyDeclarationName = isLiteralComputedPropertyDeclarationName;
+    // Return true if the given identifier is classified as an IdentifierName
     function isIdentifierName(node) {
         var parent = node.parent;
         switch (parent.kind) {
-            case 152:
-            case 151:
-            case 154:
-            case 153:
-            case 156:
-            case 157:
-            case 273:
-            case 270:
-            case 185:
+            case 152 /* PropertyDeclaration */:
+            case 151 /* PropertySignature */:
+            case 154 /* MethodDeclaration */:
+            case 153 /* MethodSignature */:
+            case 156 /* GetAccessor */:
+            case 157 /* SetAccessor */:
+            case 273 /* EnumMember */:
+            case 270 /* PropertyAssignment */:
+            case 185 /* PropertyAccessExpression */:
+                // Name in member declaration or property name in property access
                 return parent.name === node;
-            case 146:
+            case 146 /* QualifiedName */:
+                // Name on right hand side of dot in a type query or type reference
                 if (parent.right === node) {
-                    while (parent.kind === 146) {
+                    while (parent.kind === 146 /* QualifiedName */) {
                         parent = parent.parent;
                     }
-                    return parent.kind === 165 || parent.kind === 162;
+                    return parent.kind === 165 /* TypeQuery */ || parent.kind === 162 /* TypeReference */;
                 }
                 return false;
-            case 182:
-            case 248:
+            case 182 /* BindingElement */:
+            case 248 /* ImportSpecifier */:
+                // Property name in binding element or import specifier
                 return parent.propertyName === node;
-            case 252:
-            case 262:
+            case 252 /* ExportSpecifier */:
+            case 262 /* JsxAttribute */:
+                // Any name in an export specifier or JSX Attribute
                 return true;
         }
         return false;
     }
     ts.isIdentifierName = isIdentifierName;
+    // An alias symbol is created by one of the following declarations:
+    // import <symbol> = ...
+    // import <symbol> from ...
+    // import * as <symbol> from ...
+    // import { x as <symbol> } from ...
+    // export { x as <symbol> } from ...
+    // export = <EntityNameExpression>
+    // export default <EntityNameExpression>
     function isAliasSymbolDeclaration(node) {
-        return node.kind === 243 ||
-            node.kind === 242 ||
-            node.kind === 245 && !!node.name ||
-            node.kind === 246 ||
-            node.kind === 248 ||
-            node.kind === 252 ||
-            node.kind === 249 && exportAssignmentIsAlias(node) ||
-            ts.isBinaryExpression(node) && getSpecialPropertyAssignmentKind(node) === 2;
+        return node.kind === 243 /* ImportEqualsDeclaration */ ||
+            node.kind === 242 /* NamespaceExportDeclaration */ ||
+            node.kind === 245 /* ImportClause */ && !!node.name ||
+            node.kind === 246 /* NamespaceImport */ ||
+            node.kind === 248 /* ImportSpecifier */ ||
+            node.kind === 252 /* ExportSpecifier */ ||
+            node.kind === 249 /* ExportAssignment */ && exportAssignmentIsAlias(node) ||
+            ts.isBinaryExpression(node) && getSpecialPropertyAssignmentKind(node) === 2 /* ModuleExports */;
     }
     ts.isAliasSymbolDeclaration = isAliasSymbolDeclaration;
     function exportAssignmentIsAlias(node) {
@@ -9577,15 +9728,16 @@ var ts;
     }
     ts.exportAssignmentIsAlias = exportAssignmentIsAlias;
     function getClassExtendsHeritageClauseElement(node) {
-        var heritageClause = getHeritageClause(node.heritageClauses, 85);
+        var heritageClause = getHeritageClause(node.heritageClauses, 85 /* ExtendsKeyword */);
         return heritageClause && heritageClause.types.length > 0 ? heritageClause.types[0] : undefined;
     }
     ts.getClassExtendsHeritageClauseElement = getClassExtendsHeritageClauseElement;
     function getClassImplementsHeritageClauseElements(node) {
-        var heritageClause = getHeritageClause(node.heritageClauses, 108);
+        var heritageClause = getHeritageClause(node.heritageClauses, 108 /* ImplementsKeyword */);
         return heritageClause ? heritageClause.types : undefined;
     }
     ts.getClassImplementsHeritageClauseElements = getClassImplementsHeritageClauseElements;
+    /** Returns the node in an `extends` or `implements` clause of a class or interface. */
     function getAllSuperTypeNodes(node) {
         return ts.isInterfaceDeclaration(node) ? getInterfaceBaseTypeNodes(node) || ts.emptyArray
             : ts.isClassLike(node) ? ts.concatenate(ts.singleElementArray(getClassExtendsHeritageClauseElement(node)), getClassImplementsHeritageClauseElements(node)) || ts.emptyArray
@@ -9593,7 +9745,7 @@ var ts;
     }
     ts.getAllSuperTypeNodes = getAllSuperTypeNodes;
     function getInterfaceBaseTypeNodes(node) {
-        var heritageClause = getHeritageClause(node.heritageClauses, 85);
+        var heritageClause = getHeritageClause(node.heritageClauses, 85 /* ExtendsKeyword */);
         return heritageClause ? heritageClause.types : undefined;
     }
     ts.getInterfaceBaseTypeNodes = getInterfaceBaseTypeNodes;
@@ -9627,11 +9779,11 @@ var ts;
     }
     ts.getAncestor = getAncestor;
     function isKeyword(token) {
-        return 72 <= token && token <= 145;
+        return 72 /* FirstKeyword */ <= token && token <= 145 /* LastKeyword */;
     }
     ts.isKeyword = isKeyword;
     function isContextualKeyword(token) {
-        return 117 <= token && token <= 145;
+        return 117 /* FirstContextualKeyword */ <= token && token <= 145 /* LastContextualKeyword */;
     }
     ts.isContextualKeyword = isContextualKeyword;
     function isNonContextualKeyword(token) {
@@ -9644,7 +9796,7 @@ var ts;
     }
     ts.isStringANonContextualKeyword = isStringANonContextualKeyword;
     function isTrivia(token) {
-        return 2 <= token && token <= 7;
+        return 2 /* FirstTriviaToken */ <= token && token <= 7 /* LastTriviaToken */;
     }
     ts.isTrivia = isTrivia;
     var FunctionFlags;
@@ -9657,75 +9809,88 @@ var ts;
     })(FunctionFlags = ts.FunctionFlags || (ts.FunctionFlags = {}));
     function getFunctionFlags(node) {
         if (!node) {
-            return 4;
+            return 4 /* Invalid */;
         }
-        var flags = 0;
+        var flags = 0 /* Normal */;
         switch (node.kind) {
-            case 234:
-            case 192:
-            case 154:
+            case 234 /* FunctionDeclaration */:
+            case 192 /* FunctionExpression */:
+            case 154 /* MethodDeclaration */:
                 if (node.asteriskToken) {
-                    flags |= 1;
+                    flags |= 1 /* Generator */;
                 }
-            case 193:
-                if (hasModifier(node, 256)) {
-                    flags |= 2;
+            // falls through
+            case 193 /* ArrowFunction */:
+                if (hasModifier(node, 256 /* Async */)) {
+                    flags |= 2 /* Async */;
                 }
                 break;
         }
         if (!node.body) {
-            flags |= 4;
+            flags |= 4 /* Invalid */;
         }
         return flags;
     }
     ts.getFunctionFlags = getFunctionFlags;
     function isAsyncFunction(node) {
         switch (node.kind) {
-            case 234:
-            case 192:
-            case 193:
-            case 154:
+            case 234 /* FunctionDeclaration */:
+            case 192 /* FunctionExpression */:
+            case 193 /* ArrowFunction */:
+            case 154 /* MethodDeclaration */:
                 return node.body !== undefined
                     && node.asteriskToken === undefined
-                    && hasModifier(node, 256);
+                    && hasModifier(node, 256 /* Async */);
         }
         return false;
     }
     ts.isAsyncFunction = isAsyncFunction;
     function isStringOrNumericLiteral(node) {
         var kind = node.kind;
-        return kind === 9
-            || kind === 8;
+        return kind === 9 /* StringLiteral */
+            || kind === 8 /* NumericLiteral */;
     }
     ts.isStringOrNumericLiteral = isStringOrNumericLiteral;
+    /**
+     * A declaration has a dynamic name if both of the following are true:
+     *   1. The declaration has a computed property name
+     *   2. The computed name is *not* expressed as Symbol.<name>, where name
+     *      is a property of the Symbol constructor that denotes a built in
+     *      Symbol.
+     */
     function hasDynamicName(declaration) {
         var name = ts.getNameOfDeclaration(declaration);
         return !!name && isDynamicName(name);
     }
     ts.hasDynamicName = hasDynamicName;
     function isDynamicName(name) {
-        return name.kind === 147 &&
+        return name.kind === 147 /* ComputedPropertyName */ &&
             !isStringOrNumericLiteral(name.expression) &&
             !isWellKnownSymbolSyntactically(name.expression);
     }
     ts.isDynamicName = isDynamicName;
+    /**
+     * Checks if the expression is of the form:
+     *    Symbol.name
+     * where Symbol is literally the word "Symbol", and name is any identifierName
+     */
     function isWellKnownSymbolSyntactically(node) {
         return ts.isPropertyAccessExpression(node) && isESSymbolIdentifier(node.expression);
     }
     ts.isWellKnownSymbolSyntactically = isWellKnownSymbolSyntactically;
     function getPropertyNameForPropertyNameNode(name) {
-        if (name.kind === 71) {
+        if (name.kind === 71 /* Identifier */) {
             return name.escapedText;
         }
-        if (name.kind === 9 || name.kind === 8) {
+        if (name.kind === 9 /* StringLiteral */ || name.kind === 8 /* NumericLiteral */) {
             return escapeLeadingUnderscores(name.text);
         }
-        if (name.kind === 147) {
+        if (name.kind === 147 /* ComputedPropertyName */) {
             var nameExpression = name.expression;
             if (isWellKnownSymbolSyntactically(nameExpression)) {
                 return getPropertyNameForKnownSymbolName(ts.idText(nameExpression.name));
             }
-            else if (nameExpression.kind === 9 || nameExpression.kind === 8) {
+            else if (nameExpression.kind === 9 /* StringLiteral */ || nameExpression.kind === 8 /* NumericLiteral */) {
                 return escapeLeadingUnderscores(nameExpression.text);
             }
         }
@@ -9734,10 +9899,10 @@ var ts;
     ts.getPropertyNameForPropertyNameNode = getPropertyNameForPropertyNameNode;
     function isPropertyNameLiteral(node) {
         switch (node.kind) {
-            case 71:
-            case 9:
-            case 13:
-            case 8:
+            case 71 /* Identifier */:
+            case 9 /* StringLiteral */:
+            case 13 /* NoSubstitutionTemplateLiteral */:
+            case 8 /* NumericLiteral */:
                 return true;
             default:
                 return false;
@@ -9745,11 +9910,11 @@ var ts;
     }
     ts.isPropertyNameLiteral = isPropertyNameLiteral;
     function getTextOfIdentifierOrLiteral(node) {
-        return node.kind === 71 ? ts.idText(node) : node.text;
+        return node.kind === 71 /* Identifier */ ? ts.idText(node) : node.text;
     }
     ts.getTextOfIdentifierOrLiteral = getTextOfIdentifierOrLiteral;
     function getEscapedTextOfIdentifierOrLiteral(node) {
-        return node.kind === 71 ? node.escapedText : escapeLeadingUnderscores(node.text);
+        return node.kind === 71 /* Identifier */ ? node.escapedText : escapeLeadingUnderscores(node.text);
     }
     ts.getEscapedTextOfIdentifierOrLiteral = getEscapedTextOfIdentifierOrLiteral;
     function getPropertyNameForKnownSymbolName(symbolName) {
@@ -9760,8 +9925,11 @@ var ts;
         return ts.startsWith(symbol.escapedName, "__@");
     }
     ts.isKnownSymbol = isKnownSymbol;
+    /**
+     * Includes the word "Symbol" with unicode escapes
+     */
     function isESSymbolIdentifier(node) {
-        return node.kind === 71 && node.escapedText === "Symbol";
+        return node.kind === 71 /* Identifier */ && node.escapedText === "Symbol";
     }
     ts.isESSymbolIdentifier = isESSymbolIdentifier;
     function isPushOrUnshiftIdentifier(node) {
@@ -9770,11 +9938,11 @@ var ts;
     ts.isPushOrUnshiftIdentifier = isPushOrUnshiftIdentifier;
     function isParameterDeclaration(node) {
         var root = getRootDeclaration(node);
-        return root.kind === 149;
+        return root.kind === 149 /* Parameter */;
     }
     ts.isParameterDeclaration = isParameterDeclaration;
     function getRootDeclaration(node) {
-        while (node.kind === 182) {
+        while (node.kind === 182 /* BindingElement */) {
             node = node.parent.parent;
         }
         return node;
@@ -9782,15 +9950,15 @@ var ts;
     ts.getRootDeclaration = getRootDeclaration;
     function nodeStartsNewLexicalEnvironment(node) {
         var kind = node.kind;
-        return kind === 155
-            || kind === 192
-            || kind === 234
-            || kind === 193
-            || kind === 154
-            || kind === 156
-            || kind === 157
-            || kind === 239
-            || kind === 274;
+        return kind === 155 /* Constructor */
+            || kind === 192 /* FunctionExpression */
+            || kind === 234 /* FunctionDeclaration */
+            || kind === 193 /* ArrowFunction */
+            || kind === 154 /* MethodDeclaration */
+            || kind === 156 /* GetAccessor */
+            || kind === 157 /* SetAccessor */
+            || kind === 239 /* ModuleDeclaration */
+            || kind === 274 /* SourceFile */;
     }
     ts.nodeStartsNewLexicalEnvironment = nodeStartsNewLexicalEnvironment;
     function nodeIsSynthesized(range) {
@@ -9809,55 +9977,55 @@ var ts;
     })(Associativity = ts.Associativity || (ts.Associativity = {}));
     function getExpressionAssociativity(expression) {
         var operator = getOperator(expression);
-        var hasArguments = expression.kind === 188 && expression.arguments !== undefined;
+        var hasArguments = expression.kind === 188 /* NewExpression */ && expression.arguments !== undefined;
         return getOperatorAssociativity(expression.kind, operator, hasArguments);
     }
     ts.getExpressionAssociativity = getExpressionAssociativity;
     function getOperatorAssociativity(kind, operator, hasArguments) {
         switch (kind) {
-            case 188:
-                return hasArguments ? 0 : 1;
-            case 198:
-            case 195:
-            case 196:
-            case 194:
-            case 197:
-            case 201:
-            case 203:
-                return 1;
-            case 200:
+            case 188 /* NewExpression */:
+                return hasArguments ? 0 /* Left */ : 1 /* Right */;
+            case 198 /* PrefixUnaryExpression */:
+            case 195 /* TypeOfExpression */:
+            case 196 /* VoidExpression */:
+            case 194 /* DeleteExpression */:
+            case 197 /* AwaitExpression */:
+            case 201 /* ConditionalExpression */:
+            case 203 /* YieldExpression */:
+                return 1 /* Right */;
+            case 200 /* BinaryExpression */:
                 switch (operator) {
-                    case 40:
-                    case 58:
-                    case 59:
-                    case 60:
-                    case 62:
-                    case 61:
-                    case 63:
-                    case 64:
-                    case 65:
-                    case 66:
-                    case 67:
-                    case 68:
-                    case 70:
-                    case 69:
-                        return 1;
+                    case 40 /* AsteriskAsteriskToken */:
+                    case 58 /* EqualsToken */:
+                    case 59 /* PlusEqualsToken */:
+                    case 60 /* MinusEqualsToken */:
+                    case 62 /* AsteriskAsteriskEqualsToken */:
+                    case 61 /* AsteriskEqualsToken */:
+                    case 63 /* SlashEqualsToken */:
+                    case 64 /* PercentEqualsToken */:
+                    case 65 /* LessThanLessThanEqualsToken */:
+                    case 66 /* GreaterThanGreaterThanEqualsToken */:
+                    case 67 /* GreaterThanGreaterThanGreaterThanEqualsToken */:
+                    case 68 /* AmpersandEqualsToken */:
+                    case 70 /* CaretEqualsToken */:
+                    case 69 /* BarEqualsToken */:
+                        return 1 /* Right */;
                 }
         }
-        return 0;
+        return 0 /* Left */;
     }
     ts.getOperatorAssociativity = getOperatorAssociativity;
     function getExpressionPrecedence(expression) {
         var operator = getOperator(expression);
-        var hasArguments = expression.kind === 188 && expression.arguments !== undefined;
+        var hasArguments = expression.kind === 188 /* NewExpression */ && expression.arguments !== undefined;
         return getOperatorPrecedence(expression.kind, operator, hasArguments);
     }
     ts.getExpressionPrecedence = getExpressionPrecedence;
     function getOperator(expression) {
-        if (expression.kind === 200) {
+        if (expression.kind === 200 /* BinaryExpression */) {
             return expression.operatorToken.kind;
         }
-        else if (expression.kind === 198 || expression.kind === 199) {
+        else if (expression.kind === 198 /* PrefixUnaryExpression */ || expression.kind === 199 /* PostfixUnaryExpression */) {
             return expression.operator;
         }
         else {
@@ -9867,122 +10035,125 @@ var ts;
     ts.getOperator = getOperator;
     function getOperatorPrecedence(nodeKind, operatorKind, hasArguments) {
         switch (nodeKind) {
-            case 302:
+            case 302 /* CommaListExpression */:
                 return 0;
-            case 204:
+            case 204 /* SpreadElement */:
                 return 1;
-            case 203:
+            case 203 /* YieldExpression */:
                 return 2;
-            case 201:
+            case 201 /* ConditionalExpression */:
                 return 4;
-            case 200:
+            case 200 /* BinaryExpression */:
                 switch (operatorKind) {
-                    case 26:
+                    case 26 /* CommaToken */:
                         return 0;
-                    case 58:
-                    case 59:
-                    case 60:
-                    case 62:
-                    case 61:
-                    case 63:
-                    case 64:
-                    case 65:
-                    case 66:
-                    case 67:
-                    case 68:
-                    case 70:
-                    case 69:
+                    case 58 /* EqualsToken */:
+                    case 59 /* PlusEqualsToken */:
+                    case 60 /* MinusEqualsToken */:
+                    case 62 /* AsteriskAsteriskEqualsToken */:
+                    case 61 /* AsteriskEqualsToken */:
+                    case 63 /* SlashEqualsToken */:
+                    case 64 /* PercentEqualsToken */:
+                    case 65 /* LessThanLessThanEqualsToken */:
+                    case 66 /* GreaterThanGreaterThanEqualsToken */:
+                    case 67 /* GreaterThanGreaterThanGreaterThanEqualsToken */:
+                    case 68 /* AmpersandEqualsToken */:
+                    case 70 /* CaretEqualsToken */:
+                    case 69 /* BarEqualsToken */:
                         return 3;
                     default:
                         return getBinaryOperatorPrecedence(operatorKind);
                 }
-            case 198:
-            case 195:
-            case 196:
-            case 194:
-            case 197:
+            case 198 /* PrefixUnaryExpression */:
+            case 195 /* TypeOfExpression */:
+            case 196 /* VoidExpression */:
+            case 194 /* DeleteExpression */:
+            case 197 /* AwaitExpression */:
                 return 16;
-            case 199:
+            case 199 /* PostfixUnaryExpression */:
                 return 17;
-            case 187:
+            case 187 /* CallExpression */:
                 return 18;
-            case 188:
+            case 188 /* NewExpression */:
                 return hasArguments ? 19 : 18;
-            case 189:
-            case 185:
-            case 186:
+            case 189 /* TaggedTemplateExpression */:
+            case 185 /* PropertyAccessExpression */:
+            case 186 /* ElementAccessExpression */:
                 return 19;
-            case 99:
-            case 97:
-            case 71:
-            case 95:
-            case 101:
-            case 86:
-            case 8:
-            case 9:
-            case 183:
-            case 184:
-            case 192:
-            case 193:
-            case 205:
-            case 255:
-            case 256:
-            case 259:
-            case 12:
-            case 13:
-            case 202:
-            case 191:
-            case 206:
+            case 99 /* ThisKeyword */:
+            case 97 /* SuperKeyword */:
+            case 71 /* Identifier */:
+            case 95 /* NullKeyword */:
+            case 101 /* TrueKeyword */:
+            case 86 /* FalseKeyword */:
+            case 8 /* NumericLiteral */:
+            case 9 /* StringLiteral */:
+            case 183 /* ArrayLiteralExpression */:
+            case 184 /* ObjectLiteralExpression */:
+            case 192 /* FunctionExpression */:
+            case 193 /* ArrowFunction */:
+            case 205 /* ClassExpression */:
+            case 255 /* JsxElement */:
+            case 256 /* JsxSelfClosingElement */:
+            case 259 /* JsxFragment */:
+            case 12 /* RegularExpressionLiteral */:
+            case 13 /* NoSubstitutionTemplateLiteral */:
+            case 202 /* TemplateExpression */:
+            case 191 /* ParenthesizedExpression */:
+            case 206 /* OmittedExpression */:
                 return 20;
             default:
                 return -1;
         }
     }
     ts.getOperatorPrecedence = getOperatorPrecedence;
+    /* @internal */
     function getBinaryOperatorPrecedence(kind) {
         switch (kind) {
-            case 54:
+            case 54 /* BarBarToken */:
                 return 5;
-            case 53:
+            case 53 /* AmpersandAmpersandToken */:
                 return 6;
-            case 49:
+            case 49 /* BarToken */:
                 return 7;
-            case 50:
+            case 50 /* CaretToken */:
                 return 8;
-            case 48:
+            case 48 /* AmpersandToken */:
                 return 9;
-            case 32:
-            case 33:
-            case 34:
-            case 35:
+            case 32 /* EqualsEqualsToken */:
+            case 33 /* ExclamationEqualsToken */:
+            case 34 /* EqualsEqualsEqualsToken */:
+            case 35 /* ExclamationEqualsEqualsToken */:
                 return 10;
-            case 27:
-            case 29:
-            case 30:
-            case 31:
-            case 93:
-            case 92:
-            case 118:
+            case 27 /* LessThanToken */:
+            case 29 /* GreaterThanToken */:
+            case 30 /* LessThanEqualsToken */:
+            case 31 /* GreaterThanEqualsToken */:
+            case 93 /* InstanceOfKeyword */:
+            case 92 /* InKeyword */:
+            case 118 /* AsKeyword */:
                 return 11;
-            case 45:
-            case 46:
-            case 47:
+            case 45 /* LessThanLessThanToken */:
+            case 46 /* GreaterThanGreaterThanToken */:
+            case 47 /* GreaterThanGreaterThanGreaterThanToken */:
                 return 12;
-            case 37:
-            case 38:
+            case 37 /* PlusToken */:
+            case 38 /* MinusToken */:
                 return 13;
-            case 39:
-            case 41:
-            case 42:
+            case 39 /* AsteriskToken */:
+            case 41 /* SlashToken */:
+            case 42 /* PercentToken */:
                 return 14;
-            case 40:
+            case 40 /* AsteriskAsteriskToken */:
                 return 15;
         }
+        // -1 is lower than all other precedences.  Returning it will cause binary expression
+        // parsing to stop.
         return -1;
     }
     ts.getBinaryOperatorPrecedence = getBinaryOperatorPrecedence;
     function createDiagnosticCollection() {
-        var nonFileDiagnostics = [];
+        var nonFileDiagnostics = []; // See GH#19873
         var filesWithDiagnostics = [];
         var fileDiagnostics = ts.createMap();
         var hasReadNonFileDiagnostics = false;
@@ -10000,12 +10171,13 @@ var ts;
             if (diagnostic.file) {
                 diagnostics = fileDiagnostics.get(diagnostic.file.fileName);
                 if (!diagnostics) {
-                    diagnostics = [];
+                    diagnostics = []; // See GH#19873
                     fileDiagnostics.set(diagnostic.file.fileName, diagnostics);
                     ts.insertSorted(filesWithDiagnostics, diagnostic.file.fileName, ts.compareStringsCaseSensitive);
                 }
             }
             else {
+                // If we've already read the non-file diagnostics, do not modify the existing array.
                 if (hasReadNonFileDiagnostics) {
                     hasReadNonFileDiagnostics = false;
                     nonFileDiagnostics = nonFileDiagnostics.slice();
@@ -10031,6 +10203,11 @@ var ts;
         }
     }
     ts.createDiagnosticCollection = createDiagnosticCollection;
+    // This consists of the first 19 unprintable ASCII characters, canonical escapes, lineSeparator,
+    // paragraphSeparator, and nextLine. The latter three are just desirable to suppress new lines in
+    // the language service. These characters should be escaped when printing, and if any characters are added,
+    // the map below must be updated. Note that this regexp *does not* include the 'delete' character.
+    // There is no reason for this other than that JSON.stringify does not handle it either.
     var doubleQuoteEscapedCharsRegExp = /[\\\"\u0000-\u001f\t\v\f\b\r\n\u2028\u2029\u0085]/g;
     var singleQuoteEscapedCharsRegExp = /[\\\'\u0000-\u001f\t\v\f\b\r\n\u2028\u2029\u0085]/g;
     var backtickQuoteEscapedCharsRegExp = /[\\\`\u0000-\u001f\t\v\f\b\r\n\u2028\u2029\u0085]/g;
@@ -10047,28 +10224,35 @@ var ts;
         "\`": "\\\`",
         "\u2028": "\\u2028",
         "\u2029": "\\u2029",
-        "\u0085": "\\u0085"
+        "\u0085": "\\u0085" // nextLine
     });
+    /**
+     * Based heavily on the abstract 'Quote'/'QuoteJSONString' operation from ECMA-262 (24.3.2.2),
+     * but augmented for a few select characters (e.g. lineSeparator, paragraphSeparator, nextLine)
+     * Note that this doesn't actually wrap the input in double quotes.
+     */
     function escapeString(s, quoteChar) {
-        var escapedCharsRegExp = quoteChar === 96 ? backtickQuoteEscapedCharsRegExp :
-            quoteChar === 39 ? singleQuoteEscapedCharsRegExp :
+        var escapedCharsRegExp = quoteChar === 96 /* backtick */ ? backtickQuoteEscapedCharsRegExp :
+            quoteChar === 39 /* singleQuote */ ? singleQuoteEscapedCharsRegExp :
                 doubleQuoteEscapedCharsRegExp;
         return s.replace(escapedCharsRegExp, getReplacement);
     }
     ts.escapeString = escapeString;
     function getReplacement(c, offset, input) {
-        if (c.charCodeAt(0) === 0) {
+        if (c.charCodeAt(0) === 0 /* nullCharacter */) {
             var lookAhead = input.charCodeAt(offset + c.length);
-            if (lookAhead >= 48 && lookAhead <= 57) {
+            if (lookAhead >= 48 /* _0 */ && lookAhead <= 57 /* _9 */) {
+                // If the null character is followed by digits, print as a hex escape to prevent the result from parsing as an octal (which is forbidden in strict mode)
                 return "\\x00";
             }
+            // Otherwise, keep printing a literal \0 for the null character
             return "\\0";
         }
         return escapedCharsMap.get(c) || get16BitUnicodeEscapeSequence(c.charCodeAt(0));
     }
     function isIntrinsicJsxName(name) {
         var ch = name.charCodeAt(0);
-        return (ch >= 97 && ch <= 122) || name.indexOf("-") > -1;
+        return (ch >= 97 /* a */ && ch <= 122 /* z */) || name.indexOf("-") > -1;
     }
     ts.isIntrinsicJsxName = isIntrinsicJsxName;
     function get16BitUnicodeEscapeSequence(charCode) {
@@ -10079,6 +10263,8 @@ var ts;
     var nonAsciiCharacters = /[^\u0000-\u007F]/g;
     function escapeNonAsciiString(s, quoteChar) {
         s = escapeString(s, quoteChar);
+        // Replace non-ASCII characters with '\uNNNN' escapes if any exist.
+        // Otherwise just return the original string.
         return nonAsciiCharacters.test(s) ?
             s.replace(nonAsciiCharacters, function (c) { return get16BitUnicodeEscapeSequence(c.charCodeAt(0)); }) :
             s;
@@ -10102,13 +10288,25 @@ var ts;
         var lineStart;
         var lineCount;
         var linePos;
+        function updateLineCountAndPosFor(s) {
+            var lineStartsOfS = ts.computeLineStarts(s);
+            if (lineStartsOfS.length > 1) {
+                lineCount = lineCount + lineStartsOfS.length - 1;
+                linePos = output.length - s.length + ts.last(lineStartsOfS);
+                lineStart = (linePos - output.length) === 0;
+            }
+            else {
+                lineStart = false;
+            }
+        }
         function write(s) {
             if (s && s.length) {
                 if (lineStart) {
-                    output += getIndentString(indent);
+                    s = getIndentString(indent) + s;
                     lineStart = false;
                 }
                 output += s;
+                updateLineCountAndPosFor(s);
             }
         }
         function reset() {
@@ -10120,20 +10318,13 @@ var ts;
         }
         function rawWrite(s) {
             if (s !== undefined) {
-                if (lineStart) {
-                    lineStart = false;
-                }
                 output += s;
+                updateLineCountAndPosFor(s);
             }
         }
         function writeLiteral(s) {
             if (s && s.length) {
                 write(s);
-                var lineStartsOfS = ts.computeLineStarts(s);
-                if (lineStartsOfS.length > 1) {
-                    lineCount = lineCount + lineStartsOfS.length - 1;
-                    linePos = output.length - s.length + ts.last(lineStartsOfS);
-                }
             }
         }
         function writeLine() {
@@ -10145,7 +10336,9 @@ var ts;
             }
         }
         function writeTextOfNode(text, node) {
-            write(getTextOfNodeFromSourceText(text, node));
+            var s = getTextOfNodeFromSourceText(text, node);
+            write(s);
+            updateLineCountAndPosFor(s);
         }
         reset();
         return {
@@ -10190,11 +10383,14 @@ var ts;
         return getResolvedExternalModuleName(host, file);
     }
     ts.getExternalModuleNameFromDeclaration = getExternalModuleNameFromDeclaration;
+    /**
+     * Resolves a local path to a path which is absolute to the base of the emit
+     */
     function getExternalModuleNameFromPath(host, fileName, referencePath) {
         var getCanonicalFileName = function (f) { return host.getCanonicalFileName(f); };
         var dir = ts.toPath(referencePath ? ts.getDirectoryPath(referencePath) : host.getCommonSourceDirectory(), host.getCurrentDirectory(), getCanonicalFileName);
         var filePath = ts.getNormalizedAbsolutePath(fileName, host.getCurrentDirectory());
-        var relativePath = ts.getRelativePathToDirectoryOrUrl(dir, filePath, dir, getCanonicalFileName, false);
+        var relativePath = ts.getRelativePathToDirectoryOrUrl(dir, filePath, dir, getCanonicalFileName, /*isAbsolutePathAnUrl*/ false);
         var extensionless = ts.removeFileExtension(relativePath);
         return referencePath ? ts.ensurePathIsNonModuleName(extensionless) : extensionless;
     }
@@ -10213,19 +10409,29 @@ var ts;
     ts.getOwnEmitOutputFilePath = getOwnEmitOutputFilePath;
     function getDeclarationEmitOutputFilePath(sourceFile, host) {
         var options = host.getCompilerOptions();
-        var outputDir = options.declarationDir || options.outDir;
+        var outputDir = options.declarationDir || options.outDir; // Prefer declaration folder if specified
         var path = outputDir
             ? getSourceFilePathInNewDir(sourceFile, host, outputDir)
             : sourceFile.fileName;
-        return ts.removeFileExtension(path) + ".d.ts";
+        return ts.removeFileExtension(path) + ".d.ts" /* Dts */;
     }
     ts.getDeclarationEmitOutputFilePath = getDeclarationEmitOutputFilePath;
+    /**
+     * Gets the source files that are expected to have an emit output.
+     *
+     * Originally part of `forEachExpectedEmitFile`, this functionality was extracted to support
+     * transformations.
+     *
+     * @param host An EmitHost.
+     * @param targetSourceFile An optional target source file to emit.
+     */
     function getSourceFilesToEmit(host, targetSourceFile) {
         var options = host.getCompilerOptions();
         var isSourceFileFromExternalLibrary = function (file) { return host.isSourceFileFromExternalLibrary(file); };
         if (options.outFile || options.out) {
             var moduleKind = ts.getEmitModuleKind(options);
             var moduleEmitEnabled_1 = moduleKind === ts.ModuleKind.AMD || moduleKind === ts.ModuleKind.System;
+            // Can emit only sources that are not declaration file and are either non module code or module with --module or --target es6 specified
             return ts.filter(host.getSourceFiles(), function (sourceFile) {
                 return (moduleEmitEnabled_1 || !ts.isExternalModule(sourceFile)) && sourceFileMayBeEmitted(sourceFile, options, isSourceFileFromExternalLibrary);
             });
@@ -10236,6 +10442,7 @@ var ts;
         }
     }
     ts.getSourceFilesToEmit = getSourceFilesToEmit;
+    /** Don't call this for `--outFile`, just for `--outDir` or plain emit. `--outFile` needs additional checks. */
     function sourceFileMayBeEmitted(sourceFile, options, isSourceFileFromExternalLibrary) {
         return !(options.noEmitForJsFiles && isSourceFileJavaScript(sourceFile)) && !sourceFile.isDeclarationFile && !isSourceFileFromExternalLibrary(sourceFile);
     }
@@ -10272,12 +10479,14 @@ var ts;
             return accessor.parameters[hasThis ? 1 : 0];
         }
     }
+    /** Get the type annotation for the value parameter. */
     function getSetAccessorTypeAnnotationNode(accessor) {
         var parameter = getSetAccessorValueParameter(accessor);
         return parameter && parameter.type;
     }
     ts.getSetAccessorTypeAnnotationNode = getSetAccessorTypeAnnotationNode;
     function getThisParameter(signature) {
+        // callback tags do not currently support this parameters
         if (signature.parameters.length && !ts.isJSDocSignature(signature)) {
             var thisParameter = signature.parameters[0];
             if (parameterIsThisKeyword(thisParameter)) {
@@ -10291,24 +10500,25 @@ var ts;
     }
     ts.parameterIsThisKeyword = parameterIsThisKeyword;
     function isThisIdentifier(node) {
-        return !!node && node.kind === 71 && identifierIsThisKeyword(node);
+        return !!node && node.kind === 71 /* Identifier */ && identifierIsThisKeyword(node);
     }
     ts.isThisIdentifier = isThisIdentifier;
     function identifierIsThisKeyword(id) {
-        return id.originalKeywordKind === 99;
+        return id.originalKeywordKind === 99 /* ThisKeyword */;
     }
     ts.identifierIsThisKeyword = identifierIsThisKeyword;
     function getAllAccessorDeclarations(declarations, accessor) {
+        // TODO: GH#18217
         var firstAccessor;
         var secondAccessor;
         var getAccessor;
         var setAccessor;
         if (hasDynamicName(accessor)) {
             firstAccessor = accessor;
-            if (accessor.kind === 156) {
+            if (accessor.kind === 156 /* GetAccessor */) {
                 getAccessor = accessor;
             }
-            else if (accessor.kind === 157) {
+            else if (accessor.kind === 157 /* SetAccessor */) {
                 setAccessor = accessor;
             }
             else {
@@ -10317,8 +10527,8 @@ var ts;
         }
         else {
             ts.forEach(declarations, function (member) {
-                if ((member.kind === 156 || member.kind === 157)
-                    && hasModifier(member, 32) === hasModifier(accessor, 32)) {
+                if ((member.kind === 156 /* GetAccessor */ || member.kind === 157 /* SetAccessor */)
+                    && hasModifier(member, 32 /* Static */) === hasModifier(accessor, 32 /* Static */)) {
                     var memberName = getPropertyNameForPropertyNameNode(member.name);
                     var accessorName = getPropertyNameForPropertyNameNode(accessor.name);
                     if (memberName === accessorName) {
@@ -10328,10 +10538,10 @@ var ts;
                         else if (!secondAccessor) {
                             secondAccessor = member;
                         }
-                        if (member.kind === 156 && !getAccessor) {
+                        if (member.kind === 156 /* GetAccessor */ && !getAccessor) {
                             getAccessor = member;
                         }
-                        if (member.kind === 157 && !setAccessor) {
+                        if (member.kind === 157 /* SetAccessor */ && !setAccessor) {
                             setAccessor = member;
                         }
                     }
@@ -10346,6 +10556,10 @@ var ts;
         };
     }
     ts.getAllAccessorDeclarations = getAllAccessorDeclarations;
+    /**
+     * Gets the effective type annotation of a variable, parameter, or property. If the node was
+     * parsed in a JavaScript file, gets the type annotation from JSDoc.
+     */
     function getEffectiveTypeAnnotationNode(node) {
         return node.type || (isInJavaScriptFile(node) ? ts.getJSDocType(node) : undefined);
     }
@@ -10354,6 +10568,10 @@ var ts;
         return node.type;
     }
     ts.getTypeAnnotationNode = getTypeAnnotationNode;
+    /**
+     * Gets the effective return type annotation of a signature. If the node was parsed in a
+     * JavaScript file, gets the return type annotation from JSDoc.
+     */
     function getEffectiveReturnTypeNode(node) {
         if (ts.isJSDocSignature(node)) {
             return node.type && node.type.typeExpression && node.type.typeExpression.type;
@@ -10361,12 +10579,16 @@ var ts;
         return node.type || (isInJavaScriptFile(node) ? ts.getJSDocReturnType(node) : undefined);
     }
     ts.getEffectiveReturnTypeNode = getEffectiveReturnTypeNode;
+    /**
+     * Gets the effective type parameters. If the node was parsed in a
+     * JavaScript file, gets the type parameters from the `@template` tag from JSDoc.
+     */
     function getEffectiveTypeParameterDeclarations(node) {
         if (ts.isJSDocSignature(node)) {
             return ts.emptyArray;
         }
         if (isJSDocTypeAlias(node)) {
-            ts.Debug.assert(node.parent.kind === 286);
+            ts.Debug.assert(node.parent.kind === 286 /* JSDocComment */);
             return ts.flatMap(node.parent.tags, function (tag) { return ts.isJSDocTemplateTag(tag) ? tag.typeParameters : undefined; });
         }
         return node.typeParameters || (isInJavaScriptFile(node) ? getJSDocTypeParameterDeclarations(node) : ts.emptyArray);
@@ -10376,9 +10598,14 @@ var ts;
         return ts.flatMap(ts.getJSDocTags(node), function (tag) { return isNonTypeAliasTemplate(tag) ? tag.typeParameters : undefined; });
     }
     ts.getJSDocTypeParameterDeclarations = getJSDocTypeParameterDeclarations;
+    /** template tags are only available when a typedef isn't already using them */
     function isNonTypeAliasTemplate(tag) {
-        return ts.isJSDocTemplateTag(tag) && !(tag.parent.kind === 286 && tag.parent.tags.some(isJSDocTypeAlias));
+        return ts.isJSDocTemplateTag(tag) && !(tag.parent.kind === 286 /* JSDocComment */ && tag.parent.tags.some(isJSDocTypeAlias));
     }
+    /**
+     * Gets the effective type annotation of the value parameter of a set accessor. If the node
+     * was parsed in a JavaScript file, gets the type annotation from JSDoc.
+     */
     function getEffectiveSetAccessorTypeAnnotationNode(node) {
         var parameter = getSetAccessorValueParameter(node);
         return parameter && getEffectiveTypeAnnotationNode(parameter);
@@ -10389,6 +10616,7 @@ var ts;
     }
     ts.emitNewLineBeforeLeadingComments = emitNewLineBeforeLeadingComments;
     function emitNewLineBeforeLeadingCommentsOfPosition(lineMap, writer, pos, leadingComments) {
+        // If the leading comments start on different line than the start of node, write new line
         if (leadingComments && leadingComments.length && pos !== leadingComments[0].pos &&
             getLineOfLocalPositionFromLineMap(lineMap, pos) !== getLineOfLocalPositionFromLineMap(lineMap, leadingComments[0].pos)) {
             writer.writeLine();
@@ -10396,6 +10624,7 @@ var ts;
     }
     ts.emitNewLineBeforeLeadingCommentsOfPosition = emitNewLineBeforeLeadingCommentsOfPosition;
     function emitNewLineBeforeLeadingCommentOfPosition(lineMap, writer, pos, commentPos) {
+        // If the leading comments start on different line than the start of node, write new line
         if (pos !== commentPos &&
             getLineOfLocalPositionFromLineMap(lineMap, pos) !== getLineOfLocalPositionFromLineMap(lineMap, commentPos)) {
             writer.writeLine();
@@ -10428,15 +10657,25 @@ var ts;
         }
     }
     ts.emitComments = emitComments;
+    /**
+     * Detached comment is a comment at the top of file or function body that is separated from
+     * the next statement by space.
+     */
     function emitDetachedComments(text, lineMap, writer, writeComment, node, newLine, removeComments) {
         var leadingComments;
         var currentDetachedCommentInfo;
         if (removeComments) {
+            // removeComments is true, only reserve pinned comment at the top of file
+            // For example:
+            //      /*! Pinned Comment */
+            //
+            //      var x = 10;
             if (node.pos === 0) {
                 leadingComments = ts.filter(ts.getLeadingCommentRanges(text, node.pos), isPinnedCommentLocal);
             }
         }
         else {
+            // removeComments is false, just get detached as normal and bypass the process to filter comment
             leadingComments = ts.getLeadingCommentRanges(text, node.pos);
         }
         if (leadingComments) {
@@ -10448,6 +10687,9 @@ var ts;
                     var lastCommentLine = getLineOfLocalPositionFromLineMap(lineMap, lastComment.end);
                     var commentLine = getLineOfLocalPositionFromLineMap(lineMap, comment.pos);
                     if (commentLine >= lastCommentLine + 2) {
+                        // There was a blank line between the last comment and this comment.  This
+                        // comment is not part of the copyright comments.  Return what we have so
+                        // far.
                         break;
                     }
                 }
@@ -10455,11 +10697,15 @@ var ts;
                 lastComment = comment;
             }
             if (detachedComments.length) {
+                // All comments look like they could have been part of the copyright header.  Make
+                // sure there is at least one blank line between it and the node.  If not, it's not
+                // a copyright header.
                 var lastCommentLine = getLineOfLocalPositionFromLineMap(lineMap, ts.last(detachedComments).end);
                 var nodeLine = getLineOfLocalPositionFromLineMap(lineMap, ts.skipTrivia(text, node.pos));
                 if (nodeLine >= lastCommentLine + 2) {
+                    // Valid detachedComments
                     emitNewLineBeforeLeadingComments(lineMap, writer, node, leadingComments);
-                    emitComments(text, lineMap, writer, detachedComments, false, true, newLine, writeComment);
+                    emitComments(text, lineMap, writer, detachedComments, /*leadingSeparator*/ false, /*trailingSeparator*/ true, newLine, writeComment);
                     currentDetachedCommentInfo = { nodePos: node.pos, detachedCommentEndPos: ts.last(detachedComments).end };
                 }
             }
@@ -10471,7 +10717,7 @@ var ts;
     }
     ts.emitDetachedComments = emitDetachedComments;
     function writeCommentRange(text, lineMap, writer, commentPos, commentEnd, newLine) {
-        if (text.charCodeAt(commentPos + 1) === 42) {
+        if (text.charCodeAt(commentPos + 1) === 42 /* asterisk */) {
             var firstCommentLineAndCharacter = ts.computeLineAndCharacterOfPosition(lineMap, commentPos);
             var lineCount = lineMap.length;
             var firstCommentLineIndent = void 0;
@@ -10480,29 +10726,50 @@ var ts;
                     ? text.length + 1
                     : lineMap[currentLine + 1];
                 if (pos !== commentPos) {
+                    // If we are not emitting first line, we need to write the spaces to adjust the alignment
                     if (firstCommentLineIndent === undefined) {
                         firstCommentLineIndent = calculateIndent(text, lineMap[firstCommentLineAndCharacter.line], commentPos);
                     }
+                    // These are number of spaces writer is going to write at current indent
                     var currentWriterIndentSpacing = writer.getIndent() * getIndentSize();
+                    // Number of spaces we want to be writing
+                    // eg: Assume writer indent
+                    // module m {
+                    //         /* starts at character 9 this is line 1
+                    //    * starts at character pos 4 line                        --1  = 8 - 8 + 3
+                    //   More left indented comment */                            --2  = 8 - 8 + 2
+                    //     class c { }
+                    // }
+                    // module m {
+                    //     /* this is line 1 -- Assume current writer indent 8
+                    //      * line                                                --3 = 8 - 4 + 5
+                    //            More right indented comment */                  --4 = 8 - 4 + 11
+                    //     class c { }
+                    // }
                     var spacesToEmit = currentWriterIndentSpacing - firstCommentLineIndent + calculateIndent(text, pos, nextLineStart);
                     if (spacesToEmit > 0) {
                         var numberOfSingleSpacesToEmit = spacesToEmit % getIndentSize();
                         var indentSizeSpaceString = getIndentString((spacesToEmit - numberOfSingleSpacesToEmit) / getIndentSize());
+                        // Write indent size string ( in eg 1: = "", 2: "" , 3: string with 8 spaces 4: string with 12 spaces
                         writer.rawWrite(indentSizeSpaceString);
+                        // Emit the single spaces (in eg: 1: 3 spaces, 2: 2 spaces, 3: 1 space, 4: 3 spaces)
                         while (numberOfSingleSpacesToEmit) {
                             writer.rawWrite(" ");
                             numberOfSingleSpacesToEmit--;
                         }
                     }
                     else {
+                        // No spaces to emit write empty string
                         writer.rawWrite("");
                     }
                 }
+                // Write the comment line text
                 writeTrimmedCurrentLine(text, commentEnd, writer, newLine, pos, nextLineStart);
                 pos = nextLineStart;
             }
         }
         else {
+            // Single line comment of style //....
             writer.write(text.substring(commentPos, commentEnd));
         }
     }
@@ -10511,29 +10778,33 @@ var ts;
         var end = Math.min(commentEnd, nextLineStart - 1);
         var currentLineText = text.substring(pos, end).replace(/^\s+|\s+$/g, "");
         if (currentLineText) {
+            // trimmed forward and ending spaces text
             writer.write(currentLineText);
             if (end !== commentEnd) {
                 writer.writeLine();
             }
         }
         else {
+            // Empty string - make sure we write empty line
             writer.writeLiteral(newLine);
         }
     }
     function calculateIndent(text, pos, end) {
         var currentLineIndent = 0;
         for (; pos < end && ts.isWhiteSpaceSingleLine(text.charCodeAt(pos)); pos++) {
-            if (text.charCodeAt(pos) === 9) {
+            if (text.charCodeAt(pos) === 9 /* tab */) {
+                // Tabs = TabSize = indent size and go to next tabStop
                 currentLineIndent += getIndentSize() - (currentLineIndent % getIndentSize());
             }
             else {
+                // Single space
                 currentLineIndent++;
             }
         }
         return currentLineIndent;
     }
     function hasModifiers(node) {
-        return getModifierFlags(node) !== 0;
+        return getModifierFlags(node) !== 0 /* None */;
     }
     ts.hasModifiers = hasModifiers;
     function hasModifier(node, flags) {
@@ -10541,11 +10812,11 @@ var ts;
     }
     ts.hasModifier = hasModifier;
     function hasStaticModifier(node) {
-        return hasModifier(node, 32);
+        return hasModifier(node, 32 /* Static */);
     }
     ts.hasStaticModifier = hasStaticModifier;
     function hasReadonlyModifier(node) {
-        return hasModifier(node, 64);
+        return hasModifier(node, 64 /* Readonly */);
     }
     ts.hasReadonlyModifier = hasReadonlyModifier;
     function getSelectedModifierFlags(node, flags) {
@@ -10553,58 +10824,59 @@ var ts;
     }
     ts.getSelectedModifierFlags = getSelectedModifierFlags;
     function getModifierFlags(node) {
-        if (node.modifierFlagsCache & 536870912) {
-            return node.modifierFlagsCache & ~536870912;
+        if (node.modifierFlagsCache & 536870912 /* HasComputedFlags */) {
+            return node.modifierFlagsCache & ~536870912 /* HasComputedFlags */;
         }
         var flags = getModifierFlagsNoCache(node);
-        node.modifierFlagsCache = flags | 536870912;
+        node.modifierFlagsCache = flags | 536870912 /* HasComputedFlags */;
         return flags;
     }
     ts.getModifierFlags = getModifierFlags;
     function getModifierFlagsNoCache(node) {
-        var flags = 0;
+        var flags = 0 /* None */;
         if (node.modifiers) {
             for (var _i = 0, _a = node.modifiers; _i < _a.length; _i++) {
                 var modifier = _a[_i];
                 flags |= modifierToFlag(modifier.kind);
             }
         }
-        if (node.flags & 4 || (node.kind === 71 && node.isInJSDocNamespace)) {
-            flags |= 1;
+        if (node.flags & 4 /* NestedNamespace */ || (node.kind === 71 /* Identifier */ && node.isInJSDocNamespace)) {
+            flags |= 1 /* Export */;
         }
         return flags;
     }
     ts.getModifierFlagsNoCache = getModifierFlagsNoCache;
     function modifierToFlag(token) {
         switch (token) {
-            case 115: return 32;
-            case 114: return 4;
-            case 113: return 16;
-            case 112: return 8;
-            case 117: return 128;
-            case 84: return 1;
-            case 124: return 2;
-            case 76: return 2048;
-            case 79: return 512;
-            case 120: return 256;
-            case 132: return 64;
+            case 115 /* StaticKeyword */: return 32 /* Static */;
+            case 114 /* PublicKeyword */: return 4 /* Public */;
+            case 113 /* ProtectedKeyword */: return 16 /* Protected */;
+            case 112 /* PrivateKeyword */: return 8 /* Private */;
+            case 117 /* AbstractKeyword */: return 128 /* Abstract */;
+            case 84 /* ExportKeyword */: return 1 /* Export */;
+            case 124 /* DeclareKeyword */: return 2 /* Ambient */;
+            case 76 /* ConstKeyword */: return 2048 /* Const */;
+            case 79 /* DefaultKeyword */: return 512 /* Default */;
+            case 120 /* AsyncKeyword */: return 256 /* Async */;
+            case 132 /* ReadonlyKeyword */: return 64 /* Readonly */;
         }
-        return 0;
+        return 0 /* None */;
     }
     ts.modifierToFlag = modifierToFlag;
     function isLogicalOperator(token) {
-        return token === 54
-            || token === 53
-            || token === 51;
+        return token === 54 /* BarBarToken */
+            || token === 53 /* AmpersandAmpersandToken */
+            || token === 51 /* ExclamationToken */;
     }
     ts.isLogicalOperator = isLogicalOperator;
     function isAssignmentOperator(token) {
-        return token >= 58 && token <= 70;
+        return token >= 58 /* FirstAssignment */ && token <= 70 /* LastAssignment */;
     }
     ts.isAssignmentOperator = isAssignmentOperator;
+    /** Get `C` given `N` if `N` is in the position `class C extends N` where `N` is an ExpressionWithTypeArguments. */
     function tryGetClassExtendingExpressionWithTypeArguments(node) {
         if (ts.isExpressionWithTypeArguments(node) &&
-            node.parent.token === 85 &&
+            node.parent.token === 85 /* ExtendsKeyword */ &&
             ts.isClassLike(node.parent.parent)) {
             return node.parent.parent;
         }
@@ -10613,16 +10885,16 @@ var ts;
     function isAssignmentExpression(node, excludeCompoundAssignment) {
         return ts.isBinaryExpression(node)
             && (excludeCompoundAssignment
-                ? node.operatorToken.kind === 58
+                ? node.operatorToken.kind === 58 /* EqualsToken */
                 : isAssignmentOperator(node.operatorToken.kind))
             && ts.isLeftHandSideExpression(node.left);
     }
     ts.isAssignmentExpression = isAssignmentExpression;
     function isDestructuringAssignment(node) {
-        if (isAssignmentExpression(node, true)) {
+        if (isAssignmentExpression(node, /*excludeCompoundAssignment*/ true)) {
             var kind = node.left.kind;
-            return kind === 184
-                || kind === 183;
+            return kind === 184 /* ObjectLiteralExpression */
+                || kind === 183 /* ArrayLiteralExpression */;
         }
         return false;
     }
@@ -10632,16 +10904,16 @@ var ts;
     }
     ts.isExpressionWithTypeArgumentsInClassExtendsClause = isExpressionWithTypeArgumentsInClassExtendsClause;
     function isExpressionWithTypeArgumentsInClassImplementsClause(node) {
-        return node.kind === 207
+        return node.kind === 207 /* ExpressionWithTypeArguments */
             && isEntityNameExpression(node.expression)
             && node.parent
-            && node.parent.token === 108
+            && node.parent.token === 108 /* ImplementsKeyword */
             && node.parent.parent
             && ts.isClassLike(node.parent.parent);
     }
     ts.isExpressionWithTypeArgumentsInClassImplementsClause = isExpressionWithTypeArgumentsInClassImplementsClause;
     function isEntityNameExpression(node) {
-        return node.kind === 71 || isPropertyAccessEntityNameExpression(node);
+        return node.kind === 71 /* Identifier */ || isPropertyAccessEntityNameExpression(node);
     }
     ts.isEntityNameExpression = isEntityNameExpression;
     function isPropertyAccessEntityNameExpression(node) {
@@ -10653,17 +10925,17 @@ var ts;
     }
     ts.isPrototypeAccess = isPrototypeAccess;
     function isRightSideOfQualifiedNameOrPropertyAccess(node) {
-        return (node.parent.kind === 146 && node.parent.right === node) ||
-            (node.parent.kind === 185 && node.parent.name === node);
+        return (node.parent.kind === 146 /* QualifiedName */ && node.parent.right === node) ||
+            (node.parent.kind === 185 /* PropertyAccessExpression */ && node.parent.name === node);
     }
     ts.isRightSideOfQualifiedNameOrPropertyAccess = isRightSideOfQualifiedNameOrPropertyAccess;
     function isEmptyObjectLiteral(expression) {
-        return expression.kind === 184 &&
+        return expression.kind === 184 /* ObjectLiteralExpression */ &&
             expression.properties.length === 0;
     }
     ts.isEmptyObjectLiteral = isEmptyObjectLiteral;
     function isEmptyArrayLiteral(expression) {
-        return expression.kind === 183 &&
+        return expression.kind === 183 /* ArrayLiteralExpression */ &&
             expression.elements.length === 0;
     }
     ts.isEmptyArrayLiteral = isEmptyArrayLiteral;
@@ -10672,17 +10944,23 @@ var ts;
     }
     ts.getLocalSymbolForExportDefault = getLocalSymbolForExportDefault;
     function isExportDefaultSymbol(symbol) {
-        return symbol && ts.length(symbol.declarations) > 0 && hasModifier(symbol.declarations[0], 512);
+        return symbol && ts.length(symbol.declarations) > 0 && hasModifier(symbol.declarations[0], 512 /* Default */);
     }
+    /** Return ".ts", ".d.ts", or ".tsx", if that is the extension. */
     function tryExtractTypeScriptExtension(fileName) {
         return ts.find(ts.supportedTypescriptExtensionsForExtractExtension, function (extension) { return ts.fileExtensionIs(fileName, extension); });
     }
     ts.tryExtractTypeScriptExtension = tryExtractTypeScriptExtension;
+    /**
+     * Replace each instance of non-ascii characters by one, two, three, or four escape sequences
+     * representing the UTF-8 encoding of the character, and return the expanded char code list.
+     */
     function getExpandedCharCodes(input) {
         var output = [];
         var length = input.length;
         for (var i = 0; i < length; i++) {
             var charCode = input.charCodeAt(i);
+            // handle utf8
             if (charCode < 0x80) {
                 output.push(charCode);
             }
@@ -10708,6 +10986,9 @@ var ts;
         return output;
     }
     var base64Digits = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
+    /**
+     * Converts a string to a base-64 encoded ASCII string.
+     */
     function convertToBase64(input) {
         var result = "";
         var charCodes = getExpandedCharCodes(input);
@@ -10715,16 +10996,21 @@ var ts;
         var length = charCodes.length;
         var byte1, byte2, byte3, byte4;
         while (i < length) {
+            // Convert every 6-bits in the input 3 character points
+            // into a base64 digit
             byte1 = charCodes[i] >> 2;
             byte2 = (charCodes[i] & 3) << 4 | charCodes[i + 1] >> 4;
             byte3 = (charCodes[i + 1] & 15) << 2 | charCodes[i + 2] >> 6;
             byte4 = charCodes[i + 2] & 63;
+            // We are out of characters in the input, set the extra
+            // digits to 64 (padding character).
             if (i + 1 >= length) {
                 byte3 = byte4 = 64;
             }
             else if (i + 2 >= length) {
                 byte4 = 64;
             }
+            // Write to the output
             result += base64Digits.charAt(byte1) + base64Digits.charAt(byte2) + base64Digits.charAt(byte3) + base64Digits.charAt(byte4);
             i += 3;
         }
@@ -10750,9 +11036,12 @@ var ts;
                     i++;
                     nextCode = codes[i];
                 }
+                // `value` may be greater than 10FFFF (the maximum unicode codepoint) - JS will just make this into an invalid character for us
                 output += String.fromCharCode(value);
             }
             else {
+                // We don't want to kill the process when decoding fails (due to a following char byte not
+                // following a leading char), so we just print the (bad) value
                 output += String.fromCharCode(charCode);
                 i++;
             }
@@ -10774,9 +11063,11 @@ var ts;
         var expandedCharCodes = [];
         var i = 0;
         while (i < length) {
+            // Stop decoding once padding characters are present
             if (input.charCodeAt(i) === base64Digits.charCodeAt(64)) {
                 break;
             }
+            // convert 4 input digits into three characters, ignoring padding characters at the end
             var ch1 = base64Digits.indexOf(input[i]);
             var ch2 = base64Digits.indexOf(input[i + 1]);
             var ch3 = base64Digits.indexOf(input[i + 2]);
@@ -10784,10 +11075,10 @@ var ts;
             var code1 = ((ch1 & 63) << 2) | ((ch2 >> 4) & 3);
             var code2 = ((ch2 & 15) << 4) | ((ch3 >> 2) & 15);
             var code3 = ((ch3 & 3) << 6) | (ch4 & 63);
-            if (code2 === 0 && ch3 !== 0) {
+            if (code2 === 0 && ch3 !== 0) { // code2 decoded to zero, but ch3 was padding - elide code2 and code3
                 expandedCharCodes.push(code1);
             }
-            else if (code3 === 0 && ch4 !== 0) {
+            else if (code3 === 0 && ch4 !== 0) { // code3 decoded to zero, but ch4 was padding, elide code3
                 expandedCharCodes.push(code1, code2);
             }
             else {
@@ -10802,14 +11093,17 @@ var ts;
     var lineFeed = "\n";
     function getNewLineCharacter(options, getNewLine) {
         switch (options.newLine) {
-            case 0:
+            case 0 /* CarriageReturnLineFeed */:
                 return carriageReturnLineFeed;
-            case 1:
+            case 1 /* LineFeed */:
                 return lineFeed;
         }
         return getNewLine ? getNewLine() : ts.sys ? ts.sys.newLine : carriageReturnLineFeed;
     }
     ts.getNewLineCharacter = getNewLineCharacter;
+    /**
+     * Formats an enum value as a string for debugging and debug assertions.
+     */
     function formatEnum(value, enumObject, isFlags) {
         if (value === void 0) { value = 0; }
         var members = getEnumMembers(enumObject);
@@ -10851,61 +11145,96 @@ var ts;
         return ts.stableSort(result, function (x, y) { return ts.compareValues(x[0], y[0]); });
     }
     function formatSyntaxKind(kind) {
-        return formatEnum(kind, ts.SyntaxKind, false);
+        return formatEnum(kind, ts.SyntaxKind, /*isFlags*/ false);
     }
     ts.formatSyntaxKind = formatSyntaxKind;
     function formatModifierFlags(flags) {
-        return formatEnum(flags, ts.ModifierFlags, true);
+        return formatEnum(flags, ts.ModifierFlags, /*isFlags*/ true);
     }
     ts.formatModifierFlags = formatModifierFlags;
     function formatTransformFlags(flags) {
-        return formatEnum(flags, ts.TransformFlags, true);
+        return formatEnum(flags, ts.TransformFlags, /*isFlags*/ true);
     }
     ts.formatTransformFlags = formatTransformFlags;
     function formatEmitFlags(flags) {
-        return formatEnum(flags, ts.EmitFlags, true);
+        return formatEnum(flags, ts.EmitFlags, /*isFlags*/ true);
     }
     ts.formatEmitFlags = formatEmitFlags;
     function formatSymbolFlags(flags) {
-        return formatEnum(flags, ts.SymbolFlags, true);
+        return formatEnum(flags, ts.SymbolFlags, /*isFlags*/ true);
     }
     ts.formatSymbolFlags = formatSymbolFlags;
     function formatTypeFlags(flags) {
-        return formatEnum(flags, ts.TypeFlags, true);
+        return formatEnum(flags, ts.TypeFlags, /*isFlags*/ true);
     }
     ts.formatTypeFlags = formatTypeFlags;
     function formatObjectFlags(flags) {
-        return formatEnum(flags, ts.ObjectFlags, true);
+        return formatEnum(flags, ts.ObjectFlags, /*isFlags*/ true);
     }
     ts.formatObjectFlags = formatObjectFlags;
+    /**
+     * Creates a new TextRange from the provided pos and end.
+     *
+     * @param pos The start position.
+     * @param end The end position.
+     */
     function createRange(pos, end) {
         return { pos: pos, end: end };
     }
     ts.createRange = createRange;
+    /**
+     * Creates a new TextRange from a provided range with a new end position.
+     *
+     * @param range A TextRange.
+     * @param end The new end position.
+     */
     function moveRangeEnd(range, end) {
         return createRange(range.pos, end);
     }
     ts.moveRangeEnd = moveRangeEnd;
+    /**
+     * Creates a new TextRange from a provided range with a new start position.
+     *
+     * @param range A TextRange.
+     * @param pos The new Start position.
+     */
     function moveRangePos(range, pos) {
         return createRange(pos, range.end);
     }
     ts.moveRangePos = moveRangePos;
+    /**
+     * Moves the start position of a range past any decorators.
+     */
     function moveRangePastDecorators(node) {
         return node.decorators && node.decorators.length > 0
             ? moveRangePos(node, node.decorators.end)
             : node;
     }
     ts.moveRangePastDecorators = moveRangePastDecorators;
+    /**
+     * Moves the start position of a range past any decorators or modifiers.
+     */
     function moveRangePastModifiers(node) {
         return node.modifiers && node.modifiers.length > 0
             ? moveRangePos(node, node.modifiers.end)
             : moveRangePastDecorators(node);
     }
     ts.moveRangePastModifiers = moveRangePastModifiers;
+    /**
+     * Determines whether a TextRange has the same start and end positions.
+     *
+     * @param range A TextRange.
+     */
     function isCollapsedRange(range) {
         return range.pos === range.end;
     }
     ts.isCollapsedRange = isCollapsedRange;
+    /**
+     * Creates a new TextRange for a token at the provides start position.
+     *
+     * @param pos The start position.
+     * @param token The token.
+     */
     function createTokenRange(pos, token) {
         return createRange(pos, pos + ts.tokenToString(token).length);
     }
@@ -10939,12 +11268,16 @@ var ts;
         return ts.positionIsSynthesized(range.pos) ? -1 : ts.skipTrivia(sourceFile.text, range.pos);
     }
     ts.getStartPositionOfRange = getStartPositionOfRange;
+    /**
+     * Determines whether a name was originally the declaration name of an enum or namespace
+     * declaration.
+     */
     function isDeclarationNameOfEnumOrNamespace(node) {
         var parseNode = ts.getParseTreeNode(node);
         if (parseNode) {
             switch (parseNode.parent.kind) {
-                case 238:
-                case 239:
+                case 238 /* EnumDeclaration */:
+                case 239 /* ModuleDeclaration */:
                     return parseNode === parseNode.parent.name;
             }
         }
@@ -10959,73 +11292,79 @@ var ts;
         return node.initializer !== undefined;
     }
     function isWatchSet(options) {
+        // Firefox has Object.prototype.watch
         return options.watch && options.hasOwnProperty("watch");
     }
     ts.isWatchSet = isWatchSet;
     function getCheckFlags(symbol) {
-        return symbol.flags & 33554432 ? symbol.checkFlags : 0;
+        return symbol.flags & 33554432 /* Transient */ ? symbol.checkFlags : 0;
     }
     ts.getCheckFlags = getCheckFlags;
     function getDeclarationModifierFlagsFromSymbol(s) {
         if (s.valueDeclaration) {
             var flags = ts.getCombinedModifierFlags(s.valueDeclaration);
-            return s.parent && s.parent.flags & 32 ? flags : flags & ~28;
+            return s.parent && s.parent.flags & 32 /* Class */ ? flags : flags & ~28 /* AccessibilityModifier */;
         }
-        if (getCheckFlags(s) & 6) {
+        if (getCheckFlags(s) & 6 /* Synthetic */) {
             var checkFlags = s.checkFlags;
-            var accessModifier = checkFlags & 256 ? 8 :
-                checkFlags & 64 ? 4 :
-                    16;
-            var staticModifier = checkFlags & 512 ? 32 : 0;
+            var accessModifier = checkFlags & 256 /* ContainsPrivate */ ? 8 /* Private */ :
+                checkFlags & 64 /* ContainsPublic */ ? 4 /* Public */ :
+                    16 /* Protected */;
+            var staticModifier = checkFlags & 512 /* ContainsStatic */ ? 32 /* Static */ : 0;
             return accessModifier | staticModifier;
         }
-        if (s.flags & 4194304) {
-            return 4 | 32;
+        if (s.flags & 4194304 /* Prototype */) {
+            return 4 /* Public */ | 32 /* Static */;
         }
         return 0;
     }
     ts.getDeclarationModifierFlagsFromSymbol = getDeclarationModifierFlagsFromSymbol;
     function skipAlias(symbol, checker) {
-        return symbol.flags & 2097152 ? checker.getAliasedSymbol(symbol) : symbol;
+        return symbol.flags & 2097152 /* Alias */ ? checker.getAliasedSymbol(symbol) : symbol;
     }
     ts.skipAlias = skipAlias;
+    /** See comment on `declareModuleMember` in `binder.ts`. */
     function getCombinedLocalAndExportSymbolFlags(symbol) {
         return symbol.exportSymbol ? symbol.exportSymbol.flags | symbol.flags : symbol.flags;
     }
     ts.getCombinedLocalAndExportSymbolFlags = getCombinedLocalAndExportSymbolFlags;
     function isWriteOnlyAccess(node) {
-        return accessKind(node) === 1;
+        return accessKind(node) === 1 /* Write */;
     }
     ts.isWriteOnlyAccess = isWriteOnlyAccess;
     function isWriteAccess(node) {
-        return accessKind(node) !== 0;
+        return accessKind(node) !== 0 /* Read */;
     }
     ts.isWriteAccess = isWriteAccess;
     var AccessKind;
     (function (AccessKind) {
+        /** Only reads from a variable. */
         AccessKind[AccessKind["Read"] = 0] = "Read";
+        /** Only writes to a variable without using the result. E.g.: `x++;`. */
         AccessKind[AccessKind["Write"] = 1] = "Write";
+        /** Writes to a variable and uses the result as an expression. E.g.: `f(x++);`. */
         AccessKind[AccessKind["ReadWrite"] = 2] = "ReadWrite";
     })(AccessKind || (AccessKind = {}));
     function accessKind(node) {
         var parent = node.parent;
         if (!parent)
-            return 0;
+            return 0 /* Read */;
         switch (parent.kind) {
-            case 199:
-            case 198:
+            case 199 /* PostfixUnaryExpression */:
+            case 198 /* PrefixUnaryExpression */:
                 var operator = parent.operator;
-                return operator === 43 || operator === 44 ? writeOrReadWrite() : 0;
-            case 200:
+                return operator === 43 /* PlusPlusToken */ || operator === 44 /* MinusMinusToken */ ? writeOrReadWrite() : 0 /* Read */;
+            case 200 /* BinaryExpression */:
                 var _a = parent, left = _a.left, operatorToken = _a.operatorToken;
-                return left === node && isAssignmentOperator(operatorToken.kind) ? writeOrReadWrite() : 0;
-            case 185:
-                return parent.name !== node ? 0 : accessKind(parent);
+                return left === node && isAssignmentOperator(operatorToken.kind) ? writeOrReadWrite() : 0 /* Read */;
+            case 185 /* PropertyAccessExpression */:
+                return parent.name !== node ? 0 /* Read */ : accessKind(parent);
             default:
-                return 0;
+                return 0 /* Read */;
         }
         function writeOrReadWrite() {
-            return parent.parent && parent.parent.kind === 216 ? 1 : 2;
+            // If grandparent is not an ExpressionStatement, this is used as an expression in addition to having a side effect.
+            return parent.parent && parent.parent.kind === 216 /* ExpressionStatement */ ? 1 /* Write */ : 2 /* ReadWrite */;
         }
     }
     function compareDataObjects(dst, src) {
@@ -11047,30 +11386,43 @@ var ts;
         return true;
     }
     ts.compareDataObjects = compareDataObjects;
+    /**
+     * clears already present map by calling onDeleteExistingValue callback before deleting that key/value
+     */
     function clearMap(map, onDeleteValue) {
+        // Remove all
         map.forEach(onDeleteValue);
         map.clear();
     }
     ts.clearMap = clearMap;
+    /**
+     * Mutates the map with newMap such that keys in map will be same as newMap.
+     */
     function mutateMap(map, newMap, options) {
         var createNewValue = options.createNewValue, onDeleteValue = options.onDeleteValue, onExistingValue = options.onExistingValue;
+        // Needs update
         map.forEach(function (existingValue, key) {
             var valueInNewMap = newMap.get(key);
+            // Not present any more in new map, remove it
             if (valueInNewMap === undefined) {
                 map.delete(key);
                 onDeleteValue(existingValue, key);
             }
+            // If present notify about existing values
             else if (onExistingValue) {
                 onExistingValue(existingValue, valueInNewMap, key);
             }
         });
+        // Add new values that are not already present
         newMap.forEach(function (valueInNewMap, key) {
             if (!map.has(key)) {
+                // New values
                 map.set(key, createNewValue(key, valueInNewMap));
             }
         });
     }
     ts.mutateMap = mutateMap;
+    /** Calls `callback` on `directory` and every ancestor directory it has, returning the first defined result. */
     function forEachAncestorDirectory(directory, callback) {
         while (true) {
             var result = callback(directory);
@@ -11085,14 +11437,15 @@ var ts;
         }
     }
     ts.forEachAncestorDirectory = forEachAncestorDirectory;
+    // Return true if the given type is the constructor type for an abstract class
     function isAbstractConstructorType(type) {
-        return !!(getObjectFlags(type) & 16) && !!type.symbol && isAbstractConstructorSymbol(type.symbol);
+        return !!(getObjectFlags(type) & 16 /* Anonymous */) && !!type.symbol && isAbstractConstructorSymbol(type.symbol);
     }
     ts.isAbstractConstructorType = isAbstractConstructorType;
     function isAbstractConstructorSymbol(symbol) {
-        if (symbol.flags & 32) {
+        if (symbol.flags & 32 /* Class */) {
             var declaration = getClassLikeDeclarationOfSymbol(symbol);
-            return !!declaration && hasModifier(declaration, 128);
+            return !!declaration && hasModifier(declaration, 128 /* Abstract */);
         }
         return false;
     }
@@ -11102,11 +11455,11 @@ var ts;
     }
     ts.getClassLikeDeclarationOfSymbol = getClassLikeDeclarationOfSymbol;
     function getObjectFlags(type) {
-        return type.flags & 131072 ? type.objectFlags : 0;
+        return type.flags & 131072 /* Object */ ? type.objectFlags : 0;
     }
     ts.getObjectFlags = getObjectFlags;
     function typeHasCallOrConstructSignatures(type, checker) {
-        return checker.getSignaturesOfType(type, 0).length !== 0 || checker.getSignaturesOfType(type, 1).length !== 0;
+        return checker.getSignaturesOfType(type, 0 /* Call */).length !== 0 || checker.getSignaturesOfType(type, 1 /* Construct */).length !== 0;
     }
     ts.typeHasCallOrConstructSignatures = typeHasCallOrConstructSignatures;
     function forSomeAncestorDirectory(directory, callback) {
@@ -11128,6 +11481,7 @@ var ts;
             if (nodeIsPresent(child))
                 lastChild = child;
         }, function (children) {
+            // As an optimization, jump straight to the end of the list.
             for (var i = children.length - 1; i >= 0; i--) {
                 if (nodeIsPresent(children[i])) {
                     lastChild = children[i];
@@ -11156,14 +11510,14 @@ var ts;
 (function (ts) {
     function getDefaultLibFileName(options) {
         switch (options.target) {
-            case 6:
+            case 6 /* ESNext */:
                 return "lib.esnext.full.d.ts";
-            case 4:
+            case 4 /* ES2017 */:
                 return "lib.es2017.full.d.ts";
-            case 3:
+            case 3 /* ES2016 */:
                 return "lib.es2016.full.d.ts";
-            case 2:
-                return "lib.es6.d.ts";
+            case 2 /* ES2015 */:
+                return "lib.es6.d.ts"; // We don't use lib.es2015.full.d.ts due to breaking change.
             default:
                 return "lib.d.ts";
         }
@@ -11181,6 +11535,7 @@ var ts;
         return position >= span.start && position < textSpanEnd(span);
     }
     ts.textSpanContainsPosition = textSpanContainsPosition;
+    // Returns true if 'span' contains 'other'.
     function textSpanContainsTextSpan(span, other) {
         return other.start >= span.start && textSpanEnd(other) <= textSpanEnd(span);
     }
@@ -11228,6 +11583,7 @@ var ts;
         return { start: start, length: length };
     }
     ts.createTextSpan = createTextSpan;
+    /* @internal */
     function createTextRange(pos, end) {
         if (end === void 0) { end = pos; }
         ts.Debug.assert(end >= pos);
@@ -11254,6 +11610,14 @@ var ts;
     }
     ts.createTextChangeRange = createTextChangeRange;
     ts.unchangedTextChangeRange = createTextChangeRange(createTextSpan(0, 0), 0);
+    /**
+     * Called to merge all the changes that occurred across several versions of a script snapshot
+     * into a single change.  i.e. if a user keeps making successive edits to a script we will
+     * have a text change from V1 to V2, V2 to V3, ..., Vn.
+     *
+     * This function will then merge those changes into a single change range valid between V1 and
+     * Vn.
+     */
     function collapseTextChangeRangesAcrossMultipleVersions(changes) {
         if (changes.length === 0) {
             return ts.unchangedTextChangeRange;
@@ -11261,12 +11625,93 @@ var ts;
         if (changes.length === 1) {
             return changes[0];
         }
+        // We change from talking about { { oldStart, oldLength }, newLength } to { oldStart, oldEnd, newEnd }
+        // as it makes things much easier to reason about.
         var change0 = changes[0];
         var oldStartN = change0.span.start;
         var oldEndN = textSpanEnd(change0.span);
         var newEndN = oldStartN + change0.newLength;
         for (var i = 1; i < changes.length; i++) {
             var nextChange = changes[i];
+            // Consider the following case:
+            // i.e. two edits.  The first represents the text change range { { 10, 50 }, 30 }.  i.e. The span starting
+            // at 10, with length 50 is reduced to length 30.  The second represents the text change range { { 30, 30 }, 40 }.
+            // i.e. the span starting at 30 with length 30 is increased to length 40.
+            //
+            //      0         10        20        30        40        50        60        70        80        90        100
+            //      -------------------------------------------------------------------------------------------------------
+            //                |                                                 /
+            //                |                                            /----
+            //  T1            |                                       /----
+            //                |                                  /----
+            //                |                             /----
+            //      -------------------------------------------------------------------------------------------------------
+            //                                     |                            \
+            //                                     |                               \
+            //   T2                                |                                 \
+            //                                     |                                   \
+            //                                     |                                      \
+            //      -------------------------------------------------------------------------------------------------------
+            //
+            // Merging these turns out to not be too difficult.  First, determining the new start of the change is trivial
+            // it's just the min of the old and new starts.  i.e.:
+            //
+            //      0         10        20        30        40        50        60        70        80        90        100
+            //      ------------------------------------------------------------*------------------------------------------
+            //                |                                                 /
+            //                |                                            /----
+            //  T1            |                                       /----
+            //                |                                  /----
+            //                |                             /----
+            //      ----------------------------------------$-------------------$------------------------------------------
+            //                .                    |                            \
+            //                .                    |                               \
+            //   T2           .                    |                                 \
+            //                .                    |                                   \
+            //                .                    |                                      \
+            //      ----------------------------------------------------------------------*--------------------------------
+            //
+            // (Note the dots represent the newly inferred start.
+            // Determining the new and old end is also pretty simple.  Basically it boils down to paying attention to the
+            // absolute positions at the asterisks, and the relative change between the dollar signs. Basically, we see
+            // which if the two $'s precedes the other, and we move that one forward until they line up.  in this case that
+            // means:
+            //
+            //      0         10        20        30        40        50        60        70        80        90        100
+            //      --------------------------------------------------------------------------------*----------------------
+            //                |                                                                     /
+            //                |                                                                /----
+            //  T1            |                                                           /----
+            //                |                                                      /----
+            //                |                                                 /----
+            //      ------------------------------------------------------------$------------------------------------------
+            //                .                    |                            \
+            //                .                    |                               \
+            //   T2           .                    |                                 \
+            //                .                    |                                   \
+            //                .                    |                                      \
+            //      ----------------------------------------------------------------------*--------------------------------
+            //
+            // In other words (in this case), we're recognizing that the second edit happened after where the first edit
+            // ended with a delta of 20 characters (60 - 40).  Thus, if we go back in time to where the first edit started
+            // that's the same as if we started at char 80 instead of 60.
+            //
+            // As it so happens, the same logic applies if the second edit precedes the first edit.  In that case rather
+            // than pushing the first edit forward to match the second, we'll push the second edit forward to match the
+            // first.
+            //
+            // In this case that means we have { oldStart: 10, oldEnd: 80, newEnd: 70 } or, in TextChangeRange
+            // semantics: { { start: 10, length: 70 }, newLength: 60 }
+            //
+            // The math then works out as follows.
+            // If we have { oldStart1, oldEnd1, newEnd1 } and { oldStart2, oldEnd2, newEnd2 } then we can compute the
+            // final result like so:
+            //
+            // {
+            //      oldStart3: Min(oldStart1, oldStart2),
+            //      oldEnd3: Max(oldEnd1, oldEnd1 + (oldEnd2 - newEnd1)),
+            //      newEnd3: Max(newEnd2, newEnd2 + (newEnd1 - oldEnd2))
+            // }
             var oldStart1 = oldStartN;
             var oldEnd1 = oldEndN;
             var newEnd1 = newEndN;
@@ -11277,13 +11722,13 @@ var ts;
             oldEndN = Math.max(oldEnd1, oldEnd1 + (oldEnd2 - newEnd1));
             newEndN = Math.max(newEnd2, newEnd2 + (newEnd1 - oldEnd2));
         }
-        return createTextChangeRange(createTextSpanFromBounds(oldStartN, oldEndN), newEndN - oldStartN);
+        return createTextChangeRange(createTextSpanFromBounds(oldStartN, oldEndN), /*newLength*/ newEndN - oldStartN);
     }
     ts.collapseTextChangeRangesAcrossMultipleVersions = collapseTextChangeRangesAcrossMultipleVersions;
     function getTypeParameterOwner(d) {
-        if (d && d.kind === 148) {
+        if (d && d.kind === 148 /* TypeParameter */) {
             for (var current = d; current; current = current.parent) {
-                if (ts.isFunctionLike(current) || ts.isClassLike(current) || current.kind === 236) {
+                if (ts.isFunctionLike(current) || ts.isClassLike(current) || current.kind === 236 /* InterfaceDeclaration */) {
                     return current;
                 }
             }
@@ -11291,7 +11736,7 @@ var ts;
     }
     ts.getTypeParameterOwner = getTypeParameterOwner;
     function isParameterPropertyDeclaration(node) {
-        return ts.hasModifier(node, 92) && node.parent.kind === 155;
+        return ts.hasModifier(node, 92 /* ParameterPropertyModifier */) && node.parent.kind === 155 /* Constructor */;
     }
     ts.isParameterPropertyDeclaration = isParameterPropertyDeclaration;
     function isEmptyBindingPattern(node) {
@@ -11309,7 +11754,7 @@ var ts;
     }
     ts.isEmptyBindingElement = isEmptyBindingElement;
     function walkUpBindingElementsAndPatterns(node) {
-        while (node && (node.kind === 182 || ts.isBindingPattern(node))) {
+        while (node && (node.kind === 182 /* BindingElement */ || ts.isBindingPattern(node))) {
             node = node.parent;
         }
         return node;
@@ -11317,35 +11762,46 @@ var ts;
     function getCombinedModifierFlags(node) {
         node = walkUpBindingElementsAndPatterns(node);
         var flags = ts.getModifierFlags(node);
-        if (node.kind === 232) {
+        if (node.kind === 232 /* VariableDeclaration */) {
             node = node.parent;
         }
-        if (node && node.kind === 233) {
+        if (node && node.kind === 233 /* VariableDeclarationList */) {
             flags |= ts.getModifierFlags(node);
             node = node.parent;
         }
-        if (node && node.kind === 214) {
+        if (node && node.kind === 214 /* VariableStatement */) {
             flags |= ts.getModifierFlags(node);
         }
         return flags;
     }
     ts.getCombinedModifierFlags = getCombinedModifierFlags;
+    // Returns the node flags for this node and all relevant parent nodes.  This is done so that
+    // nodes like variable declarations and binding elements can returned a view of their flags
+    // that includes the modifiers from their container.  i.e. flags like export/declare aren't
+    // stored on the variable declaration directly, but on the containing variable statement
+    // (if it has one).  Similarly, flags for let/const are store on the variable declaration
+    // list.  By calling this function, all those flags are combined so that the client can treat
+    // the node as if it actually had those flags.
     function getCombinedNodeFlags(node) {
         node = walkUpBindingElementsAndPatterns(node);
         var flags = node.flags;
-        if (node.kind === 232) {
+        if (node.kind === 232 /* VariableDeclaration */) {
             node = node.parent;
         }
-        if (node && node.kind === 233) {
+        if (node && node.kind === 233 /* VariableDeclarationList */) {
             flags |= node.flags;
             node = node.parent;
         }
-        if (node && node.kind === 214) {
+        if (node && node.kind === 214 /* VariableStatement */) {
             flags |= node.flags;
         }
         return flags;
     }
     ts.getCombinedNodeFlags = getCombinedNodeFlags;
+    /**
+     * Checks to see if the locale is in the appropriate format,
+     * and if it is, attempts to set the appropriate language.
+     */
     function validateLocaleAndSetLanguage(locale, sys, errors) {
         var matchResult = /^([a-z]+)([_\-]([a-z]+))?$/.exec(locale.toLowerCase());
         if (!matchResult) {
@@ -11356,9 +11812,12 @@ var ts;
         }
         var language = matchResult[1];
         var territory = matchResult[3];
+        // First try the entire locale, then fall back to just language if that's all we have.
+        // Either ways do not fail, and fallback to the English diagnostic strings.
         if (!trySetLanguageAndTerritory(language, territory, errors)) {
-            trySetLanguageAndTerritory(language, undefined, errors);
+            trySetLanguageAndTerritory(language, /*territory*/ undefined, errors);
         }
+        // Set the UI locale for string collation
         ts.setUILocale(locale);
         function trySetLanguageAndTerritory(language, territory, errors) {
             var compilerFilePath = ts.normalizePath(sys.getExecutingFilePath());
@@ -11371,6 +11830,7 @@ var ts;
             if (!sys.fileExists(filePath)) {
                 return false;
             }
+            // TODO: Add codePage support for readFile?
             var fileContents = "";
             try {
                 fileContents = sys.readFile(filePath);
@@ -11382,6 +11842,7 @@ var ts;
                 return false;
             }
             try {
+                // tslint:disable-next-line no-unnecessary-qualifier (making clear this is a global mutation!)
                 ts.localizedDiagnosticMessages = JSON.parse(fileContents);
             }
             catch (_a) {
@@ -11403,8 +11864,13 @@ var ts;
         return !nodeTest || nodeTest(node) ? node : undefined;
     }
     ts.getOriginalNode = getOriginalNode;
+    /**
+     * Gets a value indicating whether a node originated in the parse tree.
+     *
+     * @param node The node to test.
+     */
     function isParseTreeNode(node) {
-        return (node.flags & 8) === 0;
+        return (node.flags & 8 /* Synthesized */) === 0;
     }
     ts.isParseTreeNode = isParseTreeNode;
     function getParseTreeNode(node, nodeTest) {
@@ -11418,9 +11884,15 @@ var ts;
         return undefined;
     }
     ts.getParseTreeNode = getParseTreeNode;
+    /**
+     * Remove extra underscore from escaped identifier text content.
+     *
+     * @param identifier The escaped identifier text.
+     * @returns The unescaped identifier text.
+     */
     function unescapeLeadingUnderscores(identifier) {
         var id = identifier;
-        return id.length >= 3 && id.charCodeAt(0) === 95 && id.charCodeAt(1) === 95 && id.charCodeAt(2) === 95 ? id.substr(1) : id;
+        return id.length >= 3 && id.charCodeAt(0) === 95 /* _ */ && id.charCodeAt(1) === 95 /* _ */ && id.charCodeAt(2) === 95 /* _ */ ? id.substr(1) : id;
     }
     ts.unescapeLeadingUnderscores = unescapeLeadingUnderscores;
     function idText(identifier) {
@@ -11431,42 +11903,55 @@ var ts;
         return unescapeLeadingUnderscores(symbol.escapedName);
     }
     ts.symbolName = symbolName;
+    /**
+     * Remove extra underscore from escaped identifier text content.
+     * @deprecated Use `id.text` for the unescaped text.
+     * @param identifier The escaped identifier text.
+     * @returns The unescaped identifier text.
+     */
     function unescapeIdentifier(id) {
         return id;
     }
     ts.unescapeIdentifier = unescapeIdentifier;
+    /**
+     * A JSDocTypedef tag has an _optional_ name field - if a name is not directly present, we should
+     * attempt to draw the name from the node the declaration is on (as that declaration is what its' symbol
+     * will be merged with)
+     */
     function nameForNamelessJSDocTypedef(declaration) {
         var hostNode = declaration.parent.parent;
         if (!hostNode) {
             return undefined;
         }
+        // Covers classes, functions - any named declaration host node
         if (ts.isDeclaration(hostNode)) {
             return getDeclarationIdentifier(hostNode);
         }
+        // Covers remaining cases
         switch (hostNode.kind) {
-            case 214:
+            case 214 /* VariableStatement */:
                 if (hostNode.declarationList && hostNode.declarationList.declarations[0]) {
                     return getDeclarationIdentifier(hostNode.declarationList.declarations[0]);
                 }
                 return undefined;
-            case 216:
+            case 216 /* ExpressionStatement */:
                 var expr = hostNode.expression;
                 switch (expr.kind) {
-                    case 185:
+                    case 185 /* PropertyAccessExpression */:
                         return expr.name;
-                    case 186:
+                    case 186 /* ElementAccessExpression */:
                         var arg = expr.argumentExpression;
                         if (ts.isIdentifier(arg)) {
                             return arg;
                         }
                 }
                 return undefined;
-            case 1:
+            case 1 /* EndOfFileToken */:
                 return undefined;
-            case 191: {
+            case 191 /* ParenthesizedExpression */: {
                 return getDeclarationIdentifier(hostNode.expression);
             }
-            case 228: {
+            case 228 /* LabeledStatement */: {
                 if (ts.isDeclaration(hostNode.statement) || ts.isExpression(hostNode.statement)) {
                     return getDeclarationIdentifier(hostNode.statement);
                 }
@@ -11484,48 +11969,50 @@ var ts;
         return declaration.name || nameForNamelessJSDocTypedef(declaration);
     }
     ts.getNameOfJSDocTypedef = getNameOfJSDocTypedef;
+    /** @internal */
     function isNamedDeclaration(node) {
-        return !!node.name;
+        return !!node.name; // A 'name' property should always be a DeclarationName.
     }
     ts.isNamedDeclaration = isNamedDeclaration;
+    // TODO: GH#18217 This is often used as if it returns a defined result
     function getNameOfDeclaration(declaration) {
         if (!declaration) {
             return undefined;
         }
         switch (declaration.kind) {
-            case 205:
-            case 192:
+            case 205 /* ClassExpression */:
+            case 192 /* FunctionExpression */:
                 if (!declaration.name) {
                     return getAssignedName(declaration);
                 }
                 break;
-            case 71:
+            case 71 /* Identifier */:
                 return declaration;
-            case 298:
-            case 293: {
+            case 298 /* JSDocPropertyTag */:
+            case 293 /* JSDocParameterTag */: {
                 var name = declaration.name;
-                if (name.kind === 146) {
+                if (name.kind === 146 /* QualifiedName */) {
                     return name.right;
                 }
                 break;
             }
-            case 200: {
+            case 200 /* BinaryExpression */: {
                 var expr = declaration;
                 switch (ts.getSpecialPropertyAssignmentKind(expr)) {
-                    case 1:
-                    case 4:
-                    case 5:
-                    case 3:
+                    case 1 /* ExportsProperty */:
+                    case 4 /* ThisProperty */:
+                    case 5 /* Property */:
+                    case 3 /* PrototypeProperty */:
                         return expr.left.name;
                     default:
                         return undefined;
                 }
             }
-            case 292:
+            case 292 /* JSDocCallbackTag */:
                 return declaration.name;
-            case 297:
+            case 297 /* JSDocTypedefTag */:
                 return getNameOfJSDocTypedef(declaration);
-            case 249: {
+            case 249 /* ExportAssignment */: {
                 var expression = declaration.expression;
                 return ts.isIdentifier(expression) ? expression : undefined;
             }
@@ -11549,6 +12036,19 @@ var ts;
             }
         }
     }
+    /**
+     * Gets the JSDoc parameter tags for the node if present.
+     *
+     * @remarks Returns any JSDoc param tag that matches the provided
+     * parameter, whether a param tag on a containing function
+     * expression, or a param tag on a variable declaration whose
+     * initializer is the containing function. The tags closest to the
+     * node are returned first, so in the previous example, the param
+     * tag on the containing function expression would be first.
+     *
+     * Does not return tags for binding patterns, because JSDoc matches
+     * parameters by name and binding patterns do not have a name.
+     */
     function getJSDocParameterTags(param) {
         if (param.name) {
             if (ts.isIdentifier(param.name)) {
@@ -11564,30 +12064,43 @@ var ts;
                 }
             }
         }
+        // return empty array for: out-of-order binding patterns and JSDoc function syntax, which has un-named parameters
         return ts.emptyArray;
     }
     ts.getJSDocParameterTags = getJSDocParameterTags;
+    /**
+     * Return true if the node has JSDoc parameter tags.
+     *
+     * @remarks Includes parameter tags that are not directly on the node,
+     * for example on a variable declaration whose initializer is a function expression.
+     */
     function hasJSDocParameterTags(node) {
         return !!getFirstJSDocTag(node, ts.isJSDocParameterTag);
     }
     ts.hasJSDocParameterTags = hasJSDocParameterTags;
+    /** Gets the JSDoc augments tag for the node if present */
     function getJSDocAugmentsTag(node) {
         return getFirstJSDocTag(node, ts.isJSDocAugmentsTag);
     }
     ts.getJSDocAugmentsTag = getJSDocAugmentsTag;
+    /** Gets the JSDoc class tag for the node if present */
     function getJSDocClassTag(node) {
         return getFirstJSDocTag(node, ts.isJSDocClassTag);
     }
     ts.getJSDocClassTag = getJSDocClassTag;
+    /** Gets the JSDoc return tag for the node if present */
     function getJSDocReturnTag(node) {
         return getFirstJSDocTag(node, ts.isJSDocReturnTag);
     }
     ts.getJSDocReturnTag = getJSDocReturnTag;
+    /** Gets the JSDoc template tag for the node if present */
     function getJSDocTemplateTag(node) {
         return getFirstJSDocTag(node, ts.isJSDocTemplateTag);
     }
     ts.getJSDocTemplateTag = getJSDocTemplateTag;
+    /** Gets the JSDoc type tag for the node if present and valid */
     function getJSDocTypeTag(node) {
+        // We should have already issued an error if there were multiple type jsdocs, so just use the first one.
         var tag = getFirstJSDocTag(node, ts.isJSDocTypeTag);
         if (tag && tag.typeExpression && tag.typeExpression.type) {
             return tag;
@@ -11595,6 +12108,17 @@ var ts;
         return undefined;
     }
     ts.getJSDocTypeTag = getJSDocTypeTag;
+    /**
+     * Gets the type node for the node if provided via JSDoc.
+     *
+     * @remarks The search includes any JSDoc param tag that relates
+     * to the provided parameter, for example a type tag on the
+     * parameter itself, or a param tag on a containing function
+     * expression, or a param tag on a variable declaration whose
+     * initializer is the containing function. The tags closest to the
+     * node are examined first, so in the previous example, the type
+     * tag directly on the node would be returned.
+     */
     function getJSDocType(node) {
         var tag = getFirstJSDocTag(node, ts.isJSDocTypeTag);
         if (!tag && ts.isParameter(node)) {
@@ -11603,13 +12127,21 @@ var ts;
         return tag && tag.typeExpression && tag.typeExpression.type;
     }
     ts.getJSDocType = getJSDocType;
+    /**
+     * Gets the return type node for the node if provided via JSDoc's return tag.
+     *
+     * @remarks `getJSDocReturnTag` just gets the whole JSDoc tag. This function
+     * gets the type from inside the braces.
+     */
     function getJSDocReturnType(node) {
         var returnTag = getJSDocReturnTag(node);
         return returnTag && returnTag.typeExpression && returnTag.typeExpression.type;
     }
     ts.getJSDocReturnType = getJSDocReturnType;
+    /** Get all JSDoc tags related to a node, including those on parent nodes. */
     function getJSDocTags(node) {
         var tags = node.jsDocCache;
+        // If cache is 'null', that means we did the work of searching for JSDoc tags and came up with nothing.
         if (tags === undefined) {
             var comments = ts.getJSDocCommentsAndTags(node);
             ts.Debug.assert(comments.length < 2 || comments[0] !== comments[1]);
@@ -11618,702 +12150,745 @@ var ts;
         return tags;
     }
     ts.getJSDocTags = getJSDocTags;
+    /** Get the first JSDoc tag of a specified kind, or undefined if not present. */
     function getFirstJSDocTag(node, predicate) {
         return ts.find(getJSDocTags(node), predicate);
     }
+    /** Gets all JSDoc tags of a specified kind, or undefined if not present. */
     function getAllJSDocTagsOfKind(node, kind) {
         return getJSDocTags(node).filter(function (doc) { return doc.kind === kind; });
     }
     ts.getAllJSDocTagsOfKind = getAllJSDocTagsOfKind;
 })(ts || (ts = {}));
+// Simple node tests of the form `node.kind === SyntaxKind.Foo`.
 (function (ts) {
+    // Literals
     function isNumericLiteral(node) {
-        return node.kind === 8;
+        return node.kind === 8 /* NumericLiteral */;
     }
     ts.isNumericLiteral = isNumericLiteral;
     function isStringLiteral(node) {
-        return node.kind === 9;
+        return node.kind === 9 /* StringLiteral */;
     }
     ts.isStringLiteral = isStringLiteral;
     function isJsxText(node) {
-        return node.kind === 10;
+        return node.kind === 10 /* JsxText */;
     }
     ts.isJsxText = isJsxText;
     function isRegularExpressionLiteral(node) {
-        return node.kind === 12;
+        return node.kind === 12 /* RegularExpressionLiteral */;
     }
     ts.isRegularExpressionLiteral = isRegularExpressionLiteral;
     function isNoSubstitutionTemplateLiteral(node) {
-        return node.kind === 13;
+        return node.kind === 13 /* NoSubstitutionTemplateLiteral */;
     }
     ts.isNoSubstitutionTemplateLiteral = isNoSubstitutionTemplateLiteral;
+    // Pseudo-literals
     function isTemplateHead(node) {
-        return node.kind === 14;
+        return node.kind === 14 /* TemplateHead */;
     }
     ts.isTemplateHead = isTemplateHead;
     function isTemplateMiddle(node) {
-        return node.kind === 15;
+        return node.kind === 15 /* TemplateMiddle */;
     }
     ts.isTemplateMiddle = isTemplateMiddle;
     function isTemplateTail(node) {
-        return node.kind === 16;
+        return node.kind === 16 /* TemplateTail */;
     }
     ts.isTemplateTail = isTemplateTail;
     function isIdentifier(node) {
-        return node.kind === 71;
+        return node.kind === 71 /* Identifier */;
     }
     ts.isIdentifier = isIdentifier;
+    // Names
     function isQualifiedName(node) {
-        return node.kind === 146;
+        return node.kind === 146 /* QualifiedName */;
     }
     ts.isQualifiedName = isQualifiedName;
     function isComputedPropertyName(node) {
-        return node.kind === 147;
+        return node.kind === 147 /* ComputedPropertyName */;
     }
     ts.isComputedPropertyName = isComputedPropertyName;
+    // Signature elements
     function isTypeParameterDeclaration(node) {
-        return node.kind === 148;
+        return node.kind === 148 /* TypeParameter */;
     }
     ts.isTypeParameterDeclaration = isTypeParameterDeclaration;
     function isParameter(node) {
-        return node.kind === 149;
+        return node.kind === 149 /* Parameter */;
     }
     ts.isParameter = isParameter;
     function isDecorator(node) {
-        return node.kind === 150;
+        return node.kind === 150 /* Decorator */;
     }
     ts.isDecorator = isDecorator;
+    // TypeMember
     function isPropertySignature(node) {
-        return node.kind === 151;
+        return node.kind === 151 /* PropertySignature */;
     }
     ts.isPropertySignature = isPropertySignature;
     function isPropertyDeclaration(node) {
-        return node.kind === 152;
+        return node.kind === 152 /* PropertyDeclaration */;
     }
     ts.isPropertyDeclaration = isPropertyDeclaration;
     function isMethodSignature(node) {
-        return node.kind === 153;
+        return node.kind === 153 /* MethodSignature */;
     }
     ts.isMethodSignature = isMethodSignature;
     function isMethodDeclaration(node) {
-        return node.kind === 154;
+        return node.kind === 154 /* MethodDeclaration */;
     }
     ts.isMethodDeclaration = isMethodDeclaration;
     function isConstructorDeclaration(node) {
-        return node.kind === 155;
+        return node.kind === 155 /* Constructor */;
     }
     ts.isConstructorDeclaration = isConstructorDeclaration;
     function isGetAccessorDeclaration(node) {
-        return node.kind === 156;
+        return node.kind === 156 /* GetAccessor */;
     }
     ts.isGetAccessorDeclaration = isGetAccessorDeclaration;
     function isSetAccessorDeclaration(node) {
-        return node.kind === 157;
+        return node.kind === 157 /* SetAccessor */;
     }
     ts.isSetAccessorDeclaration = isSetAccessorDeclaration;
     function isCallSignatureDeclaration(node) {
-        return node.kind === 158;
+        return node.kind === 158 /* CallSignature */;
     }
     ts.isCallSignatureDeclaration = isCallSignatureDeclaration;
     function isConstructSignatureDeclaration(node) {
-        return node.kind === 159;
+        return node.kind === 159 /* ConstructSignature */;
     }
     ts.isConstructSignatureDeclaration = isConstructSignatureDeclaration;
     function isIndexSignatureDeclaration(node) {
-        return node.kind === 160;
+        return node.kind === 160 /* IndexSignature */;
     }
     ts.isIndexSignatureDeclaration = isIndexSignatureDeclaration;
+    /* @internal */
     function isGetOrSetAccessorDeclaration(node) {
-        return node.kind === 157 || node.kind === 156;
+        return node.kind === 157 /* SetAccessor */ || node.kind === 156 /* GetAccessor */;
     }
     ts.isGetOrSetAccessorDeclaration = isGetOrSetAccessorDeclaration;
+    // Type
     function isTypePredicateNode(node) {
-        return node.kind === 161;
+        return node.kind === 161 /* TypePredicate */;
     }
     ts.isTypePredicateNode = isTypePredicateNode;
     function isTypeReferenceNode(node) {
-        return node.kind === 162;
+        return node.kind === 162 /* TypeReference */;
     }
     ts.isTypeReferenceNode = isTypeReferenceNode;
     function isFunctionTypeNode(node) {
-        return node.kind === 163;
+        return node.kind === 163 /* FunctionType */;
     }
     ts.isFunctionTypeNode = isFunctionTypeNode;
     function isConstructorTypeNode(node) {
-        return node.kind === 164;
+        return node.kind === 164 /* ConstructorType */;
     }
     ts.isConstructorTypeNode = isConstructorTypeNode;
     function isTypeQueryNode(node) {
-        return node.kind === 165;
+        return node.kind === 165 /* TypeQuery */;
     }
     ts.isTypeQueryNode = isTypeQueryNode;
     function isTypeLiteralNode(node) {
-        return node.kind === 166;
+        return node.kind === 166 /* TypeLiteral */;
     }
     ts.isTypeLiteralNode = isTypeLiteralNode;
     function isArrayTypeNode(node) {
-        return node.kind === 167;
+        return node.kind === 167 /* ArrayType */;
     }
     ts.isArrayTypeNode = isArrayTypeNode;
     function isTupleTypeNode(node) {
-        return node.kind === 168;
+        return node.kind === 168 /* TupleType */;
     }
     ts.isTupleTypeNode = isTupleTypeNode;
     function isUnionTypeNode(node) {
-        return node.kind === 169;
+        return node.kind === 169 /* UnionType */;
     }
     ts.isUnionTypeNode = isUnionTypeNode;
     function isIntersectionTypeNode(node) {
-        return node.kind === 170;
+        return node.kind === 170 /* IntersectionType */;
     }
     ts.isIntersectionTypeNode = isIntersectionTypeNode;
     function isConditionalTypeNode(node) {
-        return node.kind === 171;
+        return node.kind === 171 /* ConditionalType */;
     }
     ts.isConditionalTypeNode = isConditionalTypeNode;
     function isInferTypeNode(node) {
-        return node.kind === 172;
+        return node.kind === 172 /* InferType */;
     }
     ts.isInferTypeNode = isInferTypeNode;
     function isParenthesizedTypeNode(node) {
-        return node.kind === 173;
+        return node.kind === 173 /* ParenthesizedType */;
     }
     ts.isParenthesizedTypeNode = isParenthesizedTypeNode;
     function isThisTypeNode(node) {
-        return node.kind === 174;
+        return node.kind === 174 /* ThisType */;
     }
     ts.isThisTypeNode = isThisTypeNode;
     function isTypeOperatorNode(node) {
-        return node.kind === 175;
+        return node.kind === 175 /* TypeOperator */;
     }
     ts.isTypeOperatorNode = isTypeOperatorNode;
     function isIndexedAccessTypeNode(node) {
-        return node.kind === 176;
+        return node.kind === 176 /* IndexedAccessType */;
     }
     ts.isIndexedAccessTypeNode = isIndexedAccessTypeNode;
     function isMappedTypeNode(node) {
-        return node.kind === 177;
+        return node.kind === 177 /* MappedType */;
     }
     ts.isMappedTypeNode = isMappedTypeNode;
     function isLiteralTypeNode(node) {
-        return node.kind === 178;
+        return node.kind === 178 /* LiteralType */;
     }
     ts.isLiteralTypeNode = isLiteralTypeNode;
     function isImportTypeNode(node) {
-        return node.kind === 179;
+        return node.kind === 179 /* ImportType */;
     }
     ts.isImportTypeNode = isImportTypeNode;
+    // Binding patterns
     function isObjectBindingPattern(node) {
-        return node.kind === 180;
+        return node.kind === 180 /* ObjectBindingPattern */;
     }
     ts.isObjectBindingPattern = isObjectBindingPattern;
     function isArrayBindingPattern(node) {
-        return node.kind === 181;
+        return node.kind === 181 /* ArrayBindingPattern */;
     }
     ts.isArrayBindingPattern = isArrayBindingPattern;
     function isBindingElement(node) {
-        return node.kind === 182;
+        return node.kind === 182 /* BindingElement */;
     }
     ts.isBindingElement = isBindingElement;
+    // Expression
     function isArrayLiteralExpression(node) {
-        return node.kind === 183;
+        return node.kind === 183 /* ArrayLiteralExpression */;
     }
     ts.isArrayLiteralExpression = isArrayLiteralExpression;
     function isObjectLiteralExpression(node) {
-        return node.kind === 184;
+        return node.kind === 184 /* ObjectLiteralExpression */;
     }
     ts.isObjectLiteralExpression = isObjectLiteralExpression;
     function isPropertyAccessExpression(node) {
-        return node.kind === 185;
+        return node.kind === 185 /* PropertyAccessExpression */;
     }
     ts.isPropertyAccessExpression = isPropertyAccessExpression;
     function isElementAccessExpression(node) {
-        return node.kind === 186;
+        return node.kind === 186 /* ElementAccessExpression */;
     }
     ts.isElementAccessExpression = isElementAccessExpression;
     function isCallExpression(node) {
-        return node.kind === 187;
+        return node.kind === 187 /* CallExpression */;
     }
     ts.isCallExpression = isCallExpression;
     function isNewExpression(node) {
-        return node.kind === 188;
+        return node.kind === 188 /* NewExpression */;
     }
     ts.isNewExpression = isNewExpression;
     function isTaggedTemplateExpression(node) {
-        return node.kind === 189;
+        return node.kind === 189 /* TaggedTemplateExpression */;
     }
     ts.isTaggedTemplateExpression = isTaggedTemplateExpression;
     function isTypeAssertion(node) {
-        return node.kind === 190;
+        return node.kind === 190 /* TypeAssertionExpression */;
     }
     ts.isTypeAssertion = isTypeAssertion;
     function isParenthesizedExpression(node) {
-        return node.kind === 191;
+        return node.kind === 191 /* ParenthesizedExpression */;
     }
     ts.isParenthesizedExpression = isParenthesizedExpression;
     function skipPartiallyEmittedExpressions(node) {
-        while (node.kind === 301) {
+        while (node.kind === 301 /* PartiallyEmittedExpression */) {
             node = node.expression;
         }
         return node;
     }
     ts.skipPartiallyEmittedExpressions = skipPartiallyEmittedExpressions;
     function isFunctionExpression(node) {
-        return node.kind === 192;
+        return node.kind === 192 /* FunctionExpression */;
     }
     ts.isFunctionExpression = isFunctionExpression;
     function isArrowFunction(node) {
-        return node.kind === 193;
+        return node.kind === 193 /* ArrowFunction */;
     }
     ts.isArrowFunction = isArrowFunction;
     function isDeleteExpression(node) {
-        return node.kind === 194;
+        return node.kind === 194 /* DeleteExpression */;
     }
     ts.isDeleteExpression = isDeleteExpression;
     function isTypeOfExpression(node) {
-        return node.kind === 195;
+        return node.kind === 195 /* TypeOfExpression */;
     }
     ts.isTypeOfExpression = isTypeOfExpression;
     function isVoidExpression(node) {
-        return node.kind === 196;
+        return node.kind === 196 /* VoidExpression */;
     }
     ts.isVoidExpression = isVoidExpression;
     function isAwaitExpression(node) {
-        return node.kind === 197;
+        return node.kind === 197 /* AwaitExpression */;
     }
     ts.isAwaitExpression = isAwaitExpression;
     function isPrefixUnaryExpression(node) {
-        return node.kind === 198;
+        return node.kind === 198 /* PrefixUnaryExpression */;
     }
     ts.isPrefixUnaryExpression = isPrefixUnaryExpression;
     function isPostfixUnaryExpression(node) {
-        return node.kind === 199;
+        return node.kind === 199 /* PostfixUnaryExpression */;
     }
     ts.isPostfixUnaryExpression = isPostfixUnaryExpression;
     function isBinaryExpression(node) {
-        return node.kind === 200;
+        return node.kind === 200 /* BinaryExpression */;
     }
     ts.isBinaryExpression = isBinaryExpression;
     function isConditionalExpression(node) {
-        return node.kind === 201;
+        return node.kind === 201 /* ConditionalExpression */;
     }
     ts.isConditionalExpression = isConditionalExpression;
     function isTemplateExpression(node) {
-        return node.kind === 202;
+        return node.kind === 202 /* TemplateExpression */;
     }
     ts.isTemplateExpression = isTemplateExpression;
     function isYieldExpression(node) {
-        return node.kind === 203;
+        return node.kind === 203 /* YieldExpression */;
     }
     ts.isYieldExpression = isYieldExpression;
     function isSpreadElement(node) {
-        return node.kind === 204;
+        return node.kind === 204 /* SpreadElement */;
     }
     ts.isSpreadElement = isSpreadElement;
     function isClassExpression(node) {
-        return node.kind === 205;
+        return node.kind === 205 /* ClassExpression */;
     }
     ts.isClassExpression = isClassExpression;
     function isOmittedExpression(node) {
-        return node.kind === 206;
+        return node.kind === 206 /* OmittedExpression */;
     }
     ts.isOmittedExpression = isOmittedExpression;
     function isExpressionWithTypeArguments(node) {
-        return node.kind === 207;
+        return node.kind === 207 /* ExpressionWithTypeArguments */;
     }
     ts.isExpressionWithTypeArguments = isExpressionWithTypeArguments;
     function isAsExpression(node) {
-        return node.kind === 208;
+        return node.kind === 208 /* AsExpression */;
     }
     ts.isAsExpression = isAsExpression;
     function isNonNullExpression(node) {
-        return node.kind === 209;
+        return node.kind === 209 /* NonNullExpression */;
     }
     ts.isNonNullExpression = isNonNullExpression;
     function isMetaProperty(node) {
-        return node.kind === 210;
+        return node.kind === 210 /* MetaProperty */;
     }
     ts.isMetaProperty = isMetaProperty;
+    // Misc
     function isTemplateSpan(node) {
-        return node.kind === 211;
+        return node.kind === 211 /* TemplateSpan */;
     }
     ts.isTemplateSpan = isTemplateSpan;
     function isSemicolonClassElement(node) {
-        return node.kind === 212;
+        return node.kind === 212 /* SemicolonClassElement */;
     }
     ts.isSemicolonClassElement = isSemicolonClassElement;
+    // Block
     function isBlock(node) {
-        return node.kind === 213;
+        return node.kind === 213 /* Block */;
     }
     ts.isBlock = isBlock;
     function isVariableStatement(node) {
-        return node.kind === 214;
+        return node.kind === 214 /* VariableStatement */;
     }
     ts.isVariableStatement = isVariableStatement;
     function isEmptyStatement(node) {
-        return node.kind === 215;
+        return node.kind === 215 /* EmptyStatement */;
     }
     ts.isEmptyStatement = isEmptyStatement;
     function isExpressionStatement(node) {
-        return node.kind === 216;
+        return node.kind === 216 /* ExpressionStatement */;
     }
     ts.isExpressionStatement = isExpressionStatement;
     function isIfStatement(node) {
-        return node.kind === 217;
+        return node.kind === 217 /* IfStatement */;
     }
     ts.isIfStatement = isIfStatement;
     function isDoStatement(node) {
-        return node.kind === 218;
+        return node.kind === 218 /* DoStatement */;
     }
     ts.isDoStatement = isDoStatement;
     function isWhileStatement(node) {
-        return node.kind === 219;
+        return node.kind === 219 /* WhileStatement */;
     }
     ts.isWhileStatement = isWhileStatement;
     function isForStatement(node) {
-        return node.kind === 220;
+        return node.kind === 220 /* ForStatement */;
     }
     ts.isForStatement = isForStatement;
     function isForInStatement(node) {
-        return node.kind === 221;
+        return node.kind === 221 /* ForInStatement */;
     }
     ts.isForInStatement = isForInStatement;
     function isForOfStatement(node) {
-        return node.kind === 222;
+        return node.kind === 222 /* ForOfStatement */;
     }
     ts.isForOfStatement = isForOfStatement;
     function isContinueStatement(node) {
-        return node.kind === 223;
+        return node.kind === 223 /* ContinueStatement */;
     }
     ts.isContinueStatement = isContinueStatement;
     function isBreakStatement(node) {
-        return node.kind === 224;
+        return node.kind === 224 /* BreakStatement */;
     }
     ts.isBreakStatement = isBreakStatement;
     function isBreakOrContinueStatement(node) {
-        return node.kind === 224 || node.kind === 223;
+        return node.kind === 224 /* BreakStatement */ || node.kind === 223 /* ContinueStatement */;
     }
     ts.isBreakOrContinueStatement = isBreakOrContinueStatement;
     function isReturnStatement(node) {
-        return node.kind === 225;
+        return node.kind === 225 /* ReturnStatement */;
     }
     ts.isReturnStatement = isReturnStatement;
     function isWithStatement(node) {
-        return node.kind === 226;
+        return node.kind === 226 /* WithStatement */;
     }
     ts.isWithStatement = isWithStatement;
     function isSwitchStatement(node) {
-        return node.kind === 227;
+        return node.kind === 227 /* SwitchStatement */;
     }
     ts.isSwitchStatement = isSwitchStatement;
     function isLabeledStatement(node) {
-        return node.kind === 228;
+        return node.kind === 228 /* LabeledStatement */;
     }
     ts.isLabeledStatement = isLabeledStatement;
     function isThrowStatement(node) {
-        return node.kind === 229;
+        return node.kind === 229 /* ThrowStatement */;
     }
     ts.isThrowStatement = isThrowStatement;
     function isTryStatement(node) {
-        return node.kind === 230;
+        return node.kind === 230 /* TryStatement */;
     }
     ts.isTryStatement = isTryStatement;
     function isDebuggerStatement(node) {
-        return node.kind === 231;
+        return node.kind === 231 /* DebuggerStatement */;
     }
     ts.isDebuggerStatement = isDebuggerStatement;
     function isVariableDeclaration(node) {
-        return node.kind === 232;
+        return node.kind === 232 /* VariableDeclaration */;
     }
     ts.isVariableDeclaration = isVariableDeclaration;
     function isVariableDeclarationList(node) {
-        return node.kind === 233;
+        return node.kind === 233 /* VariableDeclarationList */;
     }
     ts.isVariableDeclarationList = isVariableDeclarationList;
     function isFunctionDeclaration(node) {
-        return node.kind === 234;
+        return node.kind === 234 /* FunctionDeclaration */;
     }
     ts.isFunctionDeclaration = isFunctionDeclaration;
     function isClassDeclaration(node) {
-        return node.kind === 235;
+        return node.kind === 235 /* ClassDeclaration */;
     }
     ts.isClassDeclaration = isClassDeclaration;
     function isInterfaceDeclaration(node) {
-        return node.kind === 236;
+        return node.kind === 236 /* InterfaceDeclaration */;
     }
     ts.isInterfaceDeclaration = isInterfaceDeclaration;
     function isTypeAliasDeclaration(node) {
-        return node.kind === 237;
+        return node.kind === 237 /* TypeAliasDeclaration */;
     }
     ts.isTypeAliasDeclaration = isTypeAliasDeclaration;
     function isEnumDeclaration(node) {
-        return node.kind === 238;
+        return node.kind === 238 /* EnumDeclaration */;
     }
     ts.isEnumDeclaration = isEnumDeclaration;
     function isModuleDeclaration(node) {
-        return node.kind === 239;
+        return node.kind === 239 /* ModuleDeclaration */;
     }
     ts.isModuleDeclaration = isModuleDeclaration;
     function isModuleBlock(node) {
-        return node.kind === 240;
+        return node.kind === 240 /* ModuleBlock */;
     }
     ts.isModuleBlock = isModuleBlock;
     function isCaseBlock(node) {
-        return node.kind === 241;
+        return node.kind === 241 /* CaseBlock */;
     }
     ts.isCaseBlock = isCaseBlock;
     function isNamespaceExportDeclaration(node) {
-        return node.kind === 242;
+        return node.kind === 242 /* NamespaceExportDeclaration */;
     }
     ts.isNamespaceExportDeclaration = isNamespaceExportDeclaration;
     function isImportEqualsDeclaration(node) {
-        return node.kind === 243;
+        return node.kind === 243 /* ImportEqualsDeclaration */;
     }
     ts.isImportEqualsDeclaration = isImportEqualsDeclaration;
     function isImportDeclaration(node) {
-        return node.kind === 244;
+        return node.kind === 244 /* ImportDeclaration */;
     }
     ts.isImportDeclaration = isImportDeclaration;
     function isImportClause(node) {
-        return node.kind === 245;
+        return node.kind === 245 /* ImportClause */;
     }
     ts.isImportClause = isImportClause;
     function isNamespaceImport(node) {
-        return node.kind === 246;
+        return node.kind === 246 /* NamespaceImport */;
     }
     ts.isNamespaceImport = isNamespaceImport;
     function isNamedImports(node) {
-        return node.kind === 247;
+        return node.kind === 247 /* NamedImports */;
     }
     ts.isNamedImports = isNamedImports;
     function isImportSpecifier(node) {
-        return node.kind === 248;
+        return node.kind === 248 /* ImportSpecifier */;
     }
     ts.isImportSpecifier = isImportSpecifier;
     function isExportAssignment(node) {
-        return node.kind === 249;
+        return node.kind === 249 /* ExportAssignment */;
     }
     ts.isExportAssignment = isExportAssignment;
     function isExportDeclaration(node) {
-        return node.kind === 250;
+        return node.kind === 250 /* ExportDeclaration */;
     }
     ts.isExportDeclaration = isExportDeclaration;
     function isNamedExports(node) {
-        return node.kind === 251;
+        return node.kind === 251 /* NamedExports */;
     }
     ts.isNamedExports = isNamedExports;
     function isExportSpecifier(node) {
-        return node.kind === 252;
+        return node.kind === 252 /* ExportSpecifier */;
     }
     ts.isExportSpecifier = isExportSpecifier;
     function isMissingDeclaration(node) {
-        return node.kind === 253;
+        return node.kind === 253 /* MissingDeclaration */;
     }
     ts.isMissingDeclaration = isMissingDeclaration;
+    // Module References
     function isExternalModuleReference(node) {
-        return node.kind === 254;
+        return node.kind === 254 /* ExternalModuleReference */;
     }
     ts.isExternalModuleReference = isExternalModuleReference;
+    // JSX
     function isJsxElement(node) {
-        return node.kind === 255;
+        return node.kind === 255 /* JsxElement */;
     }
     ts.isJsxElement = isJsxElement;
     function isJsxSelfClosingElement(node) {
-        return node.kind === 256;
+        return node.kind === 256 /* JsxSelfClosingElement */;
     }
     ts.isJsxSelfClosingElement = isJsxSelfClosingElement;
     function isJsxOpeningElement(node) {
-        return node.kind === 257;
+        return node.kind === 257 /* JsxOpeningElement */;
     }
     ts.isJsxOpeningElement = isJsxOpeningElement;
     function isJsxClosingElement(node) {
-        return node.kind === 258;
+        return node.kind === 258 /* JsxClosingElement */;
     }
     ts.isJsxClosingElement = isJsxClosingElement;
     function isJsxFragment(node) {
-        return node.kind === 259;
+        return node.kind === 259 /* JsxFragment */;
     }
     ts.isJsxFragment = isJsxFragment;
     function isJsxOpeningFragment(node) {
-        return node.kind === 260;
+        return node.kind === 260 /* JsxOpeningFragment */;
     }
     ts.isJsxOpeningFragment = isJsxOpeningFragment;
     function isJsxClosingFragment(node) {
-        return node.kind === 261;
+        return node.kind === 261 /* JsxClosingFragment */;
     }
     ts.isJsxClosingFragment = isJsxClosingFragment;
     function isJsxAttribute(node) {
-        return node.kind === 262;
+        return node.kind === 262 /* JsxAttribute */;
     }
     ts.isJsxAttribute = isJsxAttribute;
     function isJsxAttributes(node) {
-        return node.kind === 263;
+        return node.kind === 263 /* JsxAttributes */;
     }
     ts.isJsxAttributes = isJsxAttributes;
     function isJsxSpreadAttribute(node) {
-        return node.kind === 264;
+        return node.kind === 264 /* JsxSpreadAttribute */;
     }
     ts.isJsxSpreadAttribute = isJsxSpreadAttribute;
     function isJsxExpression(node) {
-        return node.kind === 265;
+        return node.kind === 265 /* JsxExpression */;
     }
     ts.isJsxExpression = isJsxExpression;
+    // Clauses
     function isCaseClause(node) {
-        return node.kind === 266;
+        return node.kind === 266 /* CaseClause */;
     }
     ts.isCaseClause = isCaseClause;
     function isDefaultClause(node) {
-        return node.kind === 267;
+        return node.kind === 267 /* DefaultClause */;
     }
     ts.isDefaultClause = isDefaultClause;
     function isHeritageClause(node) {
-        return node.kind === 268;
+        return node.kind === 268 /* HeritageClause */;
     }
     ts.isHeritageClause = isHeritageClause;
     function isCatchClause(node) {
-        return node.kind === 269;
+        return node.kind === 269 /* CatchClause */;
     }
     ts.isCatchClause = isCatchClause;
+    // Property assignments
     function isPropertyAssignment(node) {
-        return node.kind === 270;
+        return node.kind === 270 /* PropertyAssignment */;
     }
     ts.isPropertyAssignment = isPropertyAssignment;
     function isShorthandPropertyAssignment(node) {
-        return node.kind === 271;
+        return node.kind === 271 /* ShorthandPropertyAssignment */;
     }
     ts.isShorthandPropertyAssignment = isShorthandPropertyAssignment;
     function isSpreadAssignment(node) {
-        return node.kind === 272;
+        return node.kind === 272 /* SpreadAssignment */;
     }
     ts.isSpreadAssignment = isSpreadAssignment;
+    // Enum
     function isEnumMember(node) {
-        return node.kind === 273;
+        return node.kind === 273 /* EnumMember */;
     }
     ts.isEnumMember = isEnumMember;
+    // Top-level nodes
     function isSourceFile(node) {
-        return node.kind === 274;
+        return node.kind === 274 /* SourceFile */;
     }
     ts.isSourceFile = isSourceFile;
     function isBundle(node) {
-        return node.kind === 275;
+        return node.kind === 275 /* Bundle */;
     }
     ts.isBundle = isBundle;
+    function isUnparsedSource(node) {
+        return node.kind === 276 /* UnparsedSource */;
+    }
+    ts.isUnparsedSource = isUnparsedSource;
+    // JSDoc
     function isJSDocTypeExpression(node) {
-        return node.kind === 278;
+        return node.kind === 278 /* JSDocTypeExpression */;
     }
     ts.isJSDocTypeExpression = isJSDocTypeExpression;
     function isJSDocAllType(node) {
-        return node.kind === 279;
+        return node.kind === 279 /* JSDocAllType */;
     }
     ts.isJSDocAllType = isJSDocAllType;
     function isJSDocUnknownType(node) {
-        return node.kind === 280;
+        return node.kind === 280 /* JSDocUnknownType */;
     }
     ts.isJSDocUnknownType = isJSDocUnknownType;
     function isJSDocNullableType(node) {
-        return node.kind === 281;
+        return node.kind === 281 /* JSDocNullableType */;
     }
     ts.isJSDocNullableType = isJSDocNullableType;
     function isJSDocNonNullableType(node) {
-        return node.kind === 282;
+        return node.kind === 282 /* JSDocNonNullableType */;
     }
     ts.isJSDocNonNullableType = isJSDocNonNullableType;
     function isJSDocOptionalType(node) {
-        return node.kind === 283;
+        return node.kind === 283 /* JSDocOptionalType */;
     }
     ts.isJSDocOptionalType = isJSDocOptionalType;
     function isJSDocFunctionType(node) {
-        return node.kind === 284;
+        return node.kind === 284 /* JSDocFunctionType */;
     }
     ts.isJSDocFunctionType = isJSDocFunctionType;
     function isJSDocVariadicType(node) {
-        return node.kind === 285;
+        return node.kind === 285 /* JSDocVariadicType */;
     }
     ts.isJSDocVariadicType = isJSDocVariadicType;
     function isJSDoc(node) {
-        return node.kind === 286;
+        return node.kind === 286 /* JSDocComment */;
     }
     ts.isJSDoc = isJSDoc;
     function isJSDocAugmentsTag(node) {
-        return node.kind === 290;
+        return node.kind === 290 /* JSDocAugmentsTag */;
     }
     ts.isJSDocAugmentsTag = isJSDocAugmentsTag;
     function isJSDocClassTag(node) {
-        return node.kind === 291;
+        return node.kind === 291 /* JSDocClassTag */;
     }
     ts.isJSDocClassTag = isJSDocClassTag;
     function isJSDocParameterTag(node) {
-        return node.kind === 293;
+        return node.kind === 293 /* JSDocParameterTag */;
     }
     ts.isJSDocParameterTag = isJSDocParameterTag;
     function isJSDocReturnTag(node) {
-        return node.kind === 294;
+        return node.kind === 294 /* JSDocReturnTag */;
     }
     ts.isJSDocReturnTag = isJSDocReturnTag;
     function isJSDocTypeTag(node) {
-        return node.kind === 295;
+        return node.kind === 295 /* JSDocTypeTag */;
     }
     ts.isJSDocTypeTag = isJSDocTypeTag;
     function isJSDocTemplateTag(node) {
-        return node.kind === 296;
+        return node.kind === 296 /* JSDocTemplateTag */;
     }
     ts.isJSDocTemplateTag = isJSDocTemplateTag;
     function isJSDocTypedefTag(node) {
-        return node.kind === 297;
+        return node.kind === 297 /* JSDocTypedefTag */;
     }
     ts.isJSDocTypedefTag = isJSDocTypedefTag;
     function isJSDocPropertyTag(node) {
-        return node.kind === 298;
+        return node.kind === 298 /* JSDocPropertyTag */;
     }
     ts.isJSDocPropertyTag = isJSDocPropertyTag;
     function isJSDocPropertyLikeTag(node) {
-        return node.kind === 298 || node.kind === 293;
+        return node.kind === 298 /* JSDocPropertyTag */ || node.kind === 293 /* JSDocParameterTag */;
     }
     ts.isJSDocPropertyLikeTag = isJSDocPropertyLikeTag;
     function isJSDocTypeLiteral(node) {
-        return node.kind === 287;
+        return node.kind === 287 /* JSDocTypeLiteral */;
     }
     ts.isJSDocTypeLiteral = isJSDocTypeLiteral;
     function isJSDocCallbackTag(node) {
-        return node.kind === 292;
+        return node.kind === 292 /* JSDocCallbackTag */;
     }
     ts.isJSDocCallbackTag = isJSDocCallbackTag;
     function isJSDocSignature(node) {
-        return node.kind === 288;
+        return node.kind === 288 /* JSDocSignature */;
     }
     ts.isJSDocSignature = isJSDocSignature;
 })(ts || (ts = {}));
+// Node tests
+//
+// All node tests in the following list should *not* reference parent pointers so that
+// they may be used with transformations.
 (function (ts) {
+    /* @internal */
     function isSyntaxList(n) {
-        return n.kind === 299;
+        return n.kind === 299 /* SyntaxList */;
     }
     ts.isSyntaxList = isSyntaxList;
+    /* @internal */
     function isNode(node) {
         return isNodeKind(node.kind);
     }
     ts.isNode = isNode;
+    /* @internal */
     function isNodeKind(kind) {
-        return kind >= 146;
+        return kind >= 146 /* FirstNode */;
     }
     ts.isNodeKind = isNodeKind;
+    /**
+     * True if node is of some token syntax kind.
+     * For example, this is true for an IfKeyword but not for an IfStatement.
+     * Literals are considered tokens, except TemplateLiteral, but does include TemplateHead/Middle/Tail.
+     */
     function isToken(n) {
-        return n.kind >= 0 && n.kind <= 145;
+        return n.kind >= 0 /* FirstToken */ && n.kind <= 145 /* LastToken */;
     }
     ts.isToken = isToken;
+    // Node Arrays
+    /* @internal */
     function isNodeArray(array) {
         return array.hasOwnProperty("pos") && array.hasOwnProperty("end");
     }
     ts.isNodeArray = isNodeArray;
+    // Literals
+    /* @internal */
     function isLiteralKind(kind) {
-        return 8 <= kind && kind <= 13;
+        return 8 /* FirstLiteralToken */ <= kind && kind <= 13 /* LastLiteralToken */;
     }
     ts.isLiteralKind = isLiteralKind;
     function isLiteralExpression(node) {
         return isLiteralKind(node.kind);
     }
     ts.isLiteralExpression = isLiteralExpression;
+    // Pseudo-literals
+    /* @internal */
     function isTemplateLiteralKind(kind) {
-        return 13 <= kind && kind <= 16;
+        return 13 /* FirstTemplateToken */ <= kind && kind <= 16 /* LastTemplateToken */;
     }
     ts.isTemplateLiteralKind = isTemplateLiteralKind;
     function isTemplateLiteralToken(node) {
@@ -12322,42 +12897,48 @@ var ts;
     ts.isTemplateLiteralToken = isTemplateLiteralToken;
     function isTemplateMiddleOrTemplateTail(node) {
         var kind = node.kind;
-        return kind === 15
-            || kind === 16;
+        return kind === 15 /* TemplateMiddle */
+            || kind === 16 /* TemplateTail */;
     }
     ts.isTemplateMiddleOrTemplateTail = isTemplateMiddleOrTemplateTail;
     function isStringTextContainingNode(node) {
-        return node.kind === 9 || isTemplateLiteralKind(node.kind);
+        return node.kind === 9 /* StringLiteral */ || isTemplateLiteralKind(node.kind);
     }
     ts.isStringTextContainingNode = isStringTextContainingNode;
+    // Identifiers
+    /* @internal */
     function isGeneratedIdentifier(node) {
-        return ts.isIdentifier(node) && (node.autoGenerateFlags & 7) > 0;
+        return ts.isIdentifier(node) && (node.autoGenerateFlags & 7 /* KindMask */) > 0 /* None */;
     }
     ts.isGeneratedIdentifier = isGeneratedIdentifier;
+    // Keywords
+    /* @internal */
     function isModifierKind(token) {
         switch (token) {
-            case 117:
-            case 120:
-            case 76:
-            case 124:
-            case 79:
-            case 84:
-            case 114:
-            case 112:
-            case 113:
-            case 132:
-            case 115:
+            case 117 /* AbstractKeyword */:
+            case 120 /* AsyncKeyword */:
+            case 76 /* ConstKeyword */:
+            case 124 /* DeclareKeyword */:
+            case 79 /* DefaultKeyword */:
+            case 84 /* ExportKeyword */:
+            case 114 /* PublicKeyword */:
+            case 112 /* PrivateKeyword */:
+            case 113 /* ProtectedKeyword */:
+            case 132 /* ReadonlyKeyword */:
+            case 115 /* StaticKeyword */:
                 return true;
         }
         return false;
     }
     ts.isModifierKind = isModifierKind;
+    /* @internal */
     function isParameterPropertyModifier(kind) {
-        return !!(ts.modifierToFlag(kind) & 92);
+        return !!(ts.modifierToFlag(kind) & 92 /* ParameterPropertyModifier */);
     }
     ts.isParameterPropertyModifier = isParameterPropertyModifier;
+    /* @internal */
     function isClassMemberModifier(idToken) {
-        return isParameterPropertyModifier(idToken) || idToken === 115;
+        return isParameterPropertyModifier(idToken) || idToken === 115 /* StaticKeyword */;
     }
     ts.isClassMemberModifier = isClassMemberModifier;
     function isModifier(node) {
@@ -12366,104 +12947,111 @@ var ts;
     ts.isModifier = isModifier;
     function isEntityName(node) {
         var kind = node.kind;
-        return kind === 146
-            || kind === 71;
+        return kind === 146 /* QualifiedName */
+            || kind === 71 /* Identifier */;
     }
     ts.isEntityName = isEntityName;
     function isPropertyName(node) {
         var kind = node.kind;
-        return kind === 71
-            || kind === 9
-            || kind === 8
-            || kind === 147;
+        return kind === 71 /* Identifier */
+            || kind === 9 /* StringLiteral */
+            || kind === 8 /* NumericLiteral */
+            || kind === 147 /* ComputedPropertyName */;
     }
     ts.isPropertyName = isPropertyName;
     function isBindingName(node) {
         var kind = node.kind;
-        return kind === 71
-            || kind === 180
-            || kind === 181;
+        return kind === 71 /* Identifier */
+            || kind === 180 /* ObjectBindingPattern */
+            || kind === 181 /* ArrayBindingPattern */;
     }
     ts.isBindingName = isBindingName;
+    // Functions
     function isFunctionLike(node) {
         return node && isFunctionLikeKind(node.kind);
     }
     ts.isFunctionLike = isFunctionLike;
+    /* @internal */
     function isFunctionLikeDeclaration(node) {
         return node && isFunctionLikeDeclarationKind(node.kind);
     }
     ts.isFunctionLikeDeclaration = isFunctionLikeDeclaration;
     function isFunctionLikeDeclarationKind(kind) {
         switch (kind) {
-            case 234:
-            case 154:
-            case 155:
-            case 156:
-            case 157:
-            case 192:
-            case 193:
+            case 234 /* FunctionDeclaration */:
+            case 154 /* MethodDeclaration */:
+            case 155 /* Constructor */:
+            case 156 /* GetAccessor */:
+            case 157 /* SetAccessor */:
+            case 192 /* FunctionExpression */:
+            case 193 /* ArrowFunction */:
                 return true;
             default:
                 return false;
         }
     }
+    /* @internal */
     function isFunctionLikeKind(kind) {
         switch (kind) {
-            case 153:
-            case 158:
-            case 288:
-            case 159:
-            case 160:
-            case 163:
-            case 284:
-            case 164:
+            case 153 /* MethodSignature */:
+            case 158 /* CallSignature */:
+            case 288 /* JSDocSignature */:
+            case 159 /* ConstructSignature */:
+            case 160 /* IndexSignature */:
+            case 163 /* FunctionType */:
+            case 284 /* JSDocFunctionType */:
+            case 164 /* ConstructorType */:
                 return true;
             default:
                 return isFunctionLikeDeclarationKind(kind);
         }
     }
     ts.isFunctionLikeKind = isFunctionLikeKind;
+    /* @internal */
     function isFunctionOrModuleBlock(node) {
         return ts.isSourceFile(node) || ts.isModuleBlock(node) || ts.isBlock(node) && isFunctionLike(node.parent);
     }
     ts.isFunctionOrModuleBlock = isFunctionOrModuleBlock;
+    // Classes
     function isClassElement(node) {
         var kind = node.kind;
-        return kind === 155
-            || kind === 152
-            || kind === 154
-            || kind === 156
-            || kind === 157
-            || kind === 160
-            || kind === 212;
+        return kind === 155 /* Constructor */
+            || kind === 152 /* PropertyDeclaration */
+            || kind === 154 /* MethodDeclaration */
+            || kind === 156 /* GetAccessor */
+            || kind === 157 /* SetAccessor */
+            || kind === 160 /* IndexSignature */
+            || kind === 212 /* SemicolonClassElement */;
     }
     ts.isClassElement = isClassElement;
     function isClassLike(node) {
-        return node && (node.kind === 235 || node.kind === 205);
+        return node && (node.kind === 235 /* ClassDeclaration */ || node.kind === 205 /* ClassExpression */);
     }
     ts.isClassLike = isClassLike;
     function isAccessor(node) {
-        return node && (node.kind === 156 || node.kind === 157);
+        return node && (node.kind === 156 /* GetAccessor */ || node.kind === 157 /* SetAccessor */);
     }
     ts.isAccessor = isAccessor;
+    /* @internal */
     function isMethodOrAccessor(node) {
         switch (node.kind) {
-            case 154:
-            case 156:
-            case 157:
+            case 154 /* MethodDeclaration */:
+            case 156 /* GetAccessor */:
+            case 157 /* SetAccessor */:
                 return true;
             default:
                 return false;
         }
     }
     ts.isMethodOrAccessor = isMethodOrAccessor;
+    // Type members
     function isTypeElement(node) {
         var kind = node.kind;
-        return kind === 159
-            || kind === 158
-            || kind === 151
-            || kind === 153
-            || kind === 160;
+        return kind === 159 /* ConstructSignature */
+            || kind === 158 /* CallSignature */
+            || kind === 151 /* PropertySignature */
+            || kind === 153 /* MethodSignature */
+            || kind === 160 /* IndexSignature */;
     }
     ts.isTypeElement = isTypeElement;
     function isClassOrTypeElement(node) {
@@ -12472,125 +13060,153 @@ var ts;
     ts.isClassOrTypeElement = isClassOrTypeElement;
     function isObjectLiteralElementLike(node) {
         var kind = node.kind;
-        return kind === 270
-            || kind === 271
-            || kind === 272
-            || kind === 154
-            || kind === 156
-            || kind === 157;
+        return kind === 270 /* PropertyAssignment */
+            || kind === 271 /* ShorthandPropertyAssignment */
+            || kind === 272 /* SpreadAssignment */
+            || kind === 154 /* MethodDeclaration */
+            || kind === 156 /* GetAccessor */
+            || kind === 157 /* SetAccessor */;
     }
     ts.isObjectLiteralElementLike = isObjectLiteralElementLike;
+    // Type
     function isTypeNodeKind(kind) {
-        return (kind >= 161 && kind <= 179)
-            || kind === 119
-            || kind === 142
-            || kind === 134
-            || kind === 135
-            || kind === 122
-            || kind === 137
-            || kind === 138
-            || kind === 99
-            || kind === 105
-            || kind === 140
-            || kind === 95
-            || kind === 131
-            || kind === 207
-            || kind === 279
-            || kind === 280
-            || kind === 281
-            || kind === 282
-            || kind === 283
-            || kind === 284
-            || kind === 285;
+        return (kind >= 161 /* FirstTypeNode */ && kind <= 179 /* LastTypeNode */)
+            || kind === 119 /* AnyKeyword */
+            || kind === 142 /* UnknownKeyword */
+            || kind === 134 /* NumberKeyword */
+            || kind === 135 /* ObjectKeyword */
+            || kind === 122 /* BooleanKeyword */
+            || kind === 137 /* StringKeyword */
+            || kind === 138 /* SymbolKeyword */
+            || kind === 99 /* ThisKeyword */
+            || kind === 105 /* VoidKeyword */
+            || kind === 140 /* UndefinedKeyword */
+            || kind === 95 /* NullKeyword */
+            || kind === 131 /* NeverKeyword */
+            || kind === 207 /* ExpressionWithTypeArguments */
+            || kind === 279 /* JSDocAllType */
+            || kind === 280 /* JSDocUnknownType */
+            || kind === 281 /* JSDocNullableType */
+            || kind === 282 /* JSDocNonNullableType */
+            || kind === 283 /* JSDocOptionalType */
+            || kind === 284 /* JSDocFunctionType */
+            || kind === 285 /* JSDocVariadicType */;
     }
+    /**
+     * Node test that determines whether a node is a valid type node.
+     * This differs from the `isPartOfTypeNode` function which determines whether a node is *part*
+     * of a TypeNode.
+     */
     function isTypeNode(node) {
         return isTypeNodeKind(node.kind);
     }
     ts.isTypeNode = isTypeNode;
     function isFunctionOrConstructorTypeNode(node) {
         switch (node.kind) {
-            case 163:
-            case 164:
+            case 163 /* FunctionType */:
+            case 164 /* ConstructorType */:
                 return true;
         }
         return false;
     }
     ts.isFunctionOrConstructorTypeNode = isFunctionOrConstructorTypeNode;
+    // Binding patterns
+    /* @internal */
     function isBindingPattern(node) {
         if (node) {
             var kind = node.kind;
-            return kind === 181
-                || kind === 180;
+            return kind === 181 /* ArrayBindingPattern */
+                || kind === 180 /* ObjectBindingPattern */;
         }
         return false;
     }
     ts.isBindingPattern = isBindingPattern;
+    /* @internal */
     function isAssignmentPattern(node) {
         var kind = node.kind;
-        return kind === 183
-            || kind === 184;
+        return kind === 183 /* ArrayLiteralExpression */
+            || kind === 184 /* ObjectLiteralExpression */;
     }
     ts.isAssignmentPattern = isAssignmentPattern;
+    /* @internal */
     function isArrayBindingElement(node) {
         var kind = node.kind;
-        return kind === 182
-            || kind === 206;
+        return kind === 182 /* BindingElement */
+            || kind === 206 /* OmittedExpression */;
     }
     ts.isArrayBindingElement = isArrayBindingElement;
+    /**
+     * Determines whether the BindingOrAssignmentElement is a BindingElement-like declaration
+     */
+    /* @internal */
     function isDeclarationBindingElement(bindingElement) {
         switch (bindingElement.kind) {
-            case 232:
-            case 149:
-            case 182:
+            case 232 /* VariableDeclaration */:
+            case 149 /* Parameter */:
+            case 182 /* BindingElement */:
                 return true;
         }
         return false;
     }
     ts.isDeclarationBindingElement = isDeclarationBindingElement;
+    /**
+     * Determines whether a node is a BindingOrAssignmentPattern
+     */
+    /* @internal */
     function isBindingOrAssignmentPattern(node) {
         return isObjectBindingOrAssignmentPattern(node)
             || isArrayBindingOrAssignmentPattern(node);
     }
     ts.isBindingOrAssignmentPattern = isBindingOrAssignmentPattern;
+    /**
+     * Determines whether a node is an ObjectBindingOrAssignmentPattern
+     */
+    /* @internal */
     function isObjectBindingOrAssignmentPattern(node) {
         switch (node.kind) {
-            case 180:
-            case 184:
+            case 180 /* ObjectBindingPattern */:
+            case 184 /* ObjectLiteralExpression */:
                 return true;
         }
         return false;
     }
     ts.isObjectBindingOrAssignmentPattern = isObjectBindingOrAssignmentPattern;
+    /**
+     * Determines whether a node is an ArrayBindingOrAssignmentPattern
+     */
+    /* @internal */
     function isArrayBindingOrAssignmentPattern(node) {
         switch (node.kind) {
-            case 181:
-            case 183:
+            case 181 /* ArrayBindingPattern */:
+            case 183 /* ArrayLiteralExpression */:
                 return true;
         }
         return false;
     }
     ts.isArrayBindingOrAssignmentPattern = isArrayBindingOrAssignmentPattern;
+    /* @internal */
     function isPropertyAccessOrQualifiedNameOrImportTypeNode(node) {
         var kind = node.kind;
-        return kind === 185
-            || kind === 146
-            || kind === 179;
+        return kind === 185 /* PropertyAccessExpression */
+            || kind === 146 /* QualifiedName */
+            || kind === 179 /* ImportType */;
     }
     ts.isPropertyAccessOrQualifiedNameOrImportTypeNode = isPropertyAccessOrQualifiedNameOrImportTypeNode;
+    // Expression
     function isPropertyAccessOrQualifiedName(node) {
         var kind = node.kind;
-        return kind === 185
-            || kind === 146;
+        return kind === 185 /* PropertyAccessExpression */
+            || kind === 146 /* QualifiedName */;
     }
     ts.isPropertyAccessOrQualifiedName = isPropertyAccessOrQualifiedName;
     function isCallLikeExpression(node) {
         switch (node.kind) {
-            case 257:
-            case 256:
-            case 187:
-            case 188:
-            case 189:
-            case 150:
+            case 257 /* JsxOpeningElement */:
+            case 256 /* JsxSelfClosingElement */:
+            case 187 /* CallExpression */:
+            case 188 /* NewExpression */:
+            case 189 /* TaggedTemplateExpression */:
+            case 150 /* Decorator */:
                 return true;
             default:
                 return false;
@@ -12598,98 +13214,106 @@ var ts;
     }
     ts.isCallLikeExpression = isCallLikeExpression;
     function isCallOrNewExpression(node) {
-        return node.kind === 187 || node.kind === 188;
+        return node.kind === 187 /* CallExpression */ || node.kind === 188 /* NewExpression */;
     }
     ts.isCallOrNewExpression = isCallOrNewExpression;
     function isTemplateLiteral(node) {
         var kind = node.kind;
-        return kind === 202
-            || kind === 13;
+        return kind === 202 /* TemplateExpression */
+            || kind === 13 /* NoSubstitutionTemplateLiteral */;
     }
     ts.isTemplateLiteral = isTemplateLiteral;
+    /* @internal */
     function isLeftHandSideExpression(node) {
         return isLeftHandSideExpressionKind(ts.skipPartiallyEmittedExpressions(node).kind);
     }
     ts.isLeftHandSideExpression = isLeftHandSideExpression;
     function isLeftHandSideExpressionKind(kind) {
         switch (kind) {
-            case 185:
-            case 186:
-            case 188:
-            case 187:
-            case 255:
-            case 256:
-            case 259:
-            case 189:
-            case 183:
-            case 191:
-            case 184:
-            case 205:
-            case 192:
-            case 71:
-            case 12:
-            case 8:
-            case 9:
-            case 13:
-            case 202:
-            case 86:
-            case 95:
-            case 99:
-            case 101:
-            case 97:
-            case 209:
-            case 210:
-            case 91:
+            case 185 /* PropertyAccessExpression */:
+            case 186 /* ElementAccessExpression */:
+            case 188 /* NewExpression */:
+            case 187 /* CallExpression */:
+            case 255 /* JsxElement */:
+            case 256 /* JsxSelfClosingElement */:
+            case 259 /* JsxFragment */:
+            case 189 /* TaggedTemplateExpression */:
+            case 183 /* ArrayLiteralExpression */:
+            case 191 /* ParenthesizedExpression */:
+            case 184 /* ObjectLiteralExpression */:
+            case 205 /* ClassExpression */:
+            case 192 /* FunctionExpression */:
+            case 71 /* Identifier */:
+            case 12 /* RegularExpressionLiteral */:
+            case 8 /* NumericLiteral */:
+            case 9 /* StringLiteral */:
+            case 13 /* NoSubstitutionTemplateLiteral */:
+            case 202 /* TemplateExpression */:
+            case 86 /* FalseKeyword */:
+            case 95 /* NullKeyword */:
+            case 99 /* ThisKeyword */:
+            case 101 /* TrueKeyword */:
+            case 97 /* SuperKeyword */:
+            case 209 /* NonNullExpression */:
+            case 210 /* MetaProperty */:
+            case 91 /* ImportKeyword */: // technically this is only an Expression if it's in a CallExpression
                 return true;
             default:
                 return false;
         }
     }
+    /* @internal */
     function isUnaryExpression(node) {
         return isUnaryExpressionKind(ts.skipPartiallyEmittedExpressions(node).kind);
     }
     ts.isUnaryExpression = isUnaryExpression;
     function isUnaryExpressionKind(kind) {
         switch (kind) {
-            case 198:
-            case 199:
-            case 194:
-            case 195:
-            case 196:
-            case 197:
-            case 190:
+            case 198 /* PrefixUnaryExpression */:
+            case 199 /* PostfixUnaryExpression */:
+            case 194 /* DeleteExpression */:
+            case 195 /* TypeOfExpression */:
+            case 196 /* VoidExpression */:
+            case 197 /* AwaitExpression */:
+            case 190 /* TypeAssertionExpression */:
                 return true;
             default:
                 return isLeftHandSideExpressionKind(kind);
         }
     }
+    /* @internal */
     function isUnaryExpressionWithWrite(expr) {
         switch (expr.kind) {
-            case 199:
+            case 199 /* PostfixUnaryExpression */:
                 return true;
-            case 198:
-                return expr.operator === 43 ||
-                    expr.operator === 44;
+            case 198 /* PrefixUnaryExpression */:
+                return expr.operator === 43 /* PlusPlusToken */ ||
+                    expr.operator === 44 /* MinusMinusToken */;
             default:
                 return false;
         }
     }
     ts.isUnaryExpressionWithWrite = isUnaryExpressionWithWrite;
+    /* @internal */
+    /**
+     * Determines whether a node is an expression based only on its kind.
+     * Use `isExpressionNode` if not in transforms.
+     */
     function isExpression(node) {
         return isExpressionKind(ts.skipPartiallyEmittedExpressions(node).kind);
     }
     ts.isExpression = isExpression;
     function isExpressionKind(kind) {
         switch (kind) {
-            case 201:
-            case 203:
-            case 193:
-            case 200:
-            case 204:
-            case 208:
-            case 206:
-            case 302:
-            case 301:
+            case 201 /* ConditionalExpression */:
+            case 203 /* YieldExpression */:
+            case 193 /* ArrowFunction */:
+            case 200 /* BinaryExpression */:
+            case 204 /* SpreadElement */:
+            case 208 /* AsExpression */:
+            case 206 /* OmittedExpression */:
+            case 302 /* CommaListExpression */:
+            case 301 /* PartiallyEmittedExpression */:
                 return true;
             default:
                 return isUnaryExpressionKind(kind);
@@ -12697,18 +13321,21 @@ var ts;
     }
     function isAssertionExpression(node) {
         var kind = node.kind;
-        return kind === 190
-            || kind === 208;
+        return kind === 190 /* TypeAssertionExpression */
+            || kind === 208 /* AsExpression */;
     }
     ts.isAssertionExpression = isAssertionExpression;
+    /* @internal */
     function isPartiallyEmittedExpression(node) {
-        return node.kind === 301;
+        return node.kind === 301 /* PartiallyEmittedExpression */;
     }
     ts.isPartiallyEmittedExpression = isPartiallyEmittedExpression;
+    /* @internal */
     function isNotEmittedStatement(node) {
-        return node.kind === 300;
+        return node.kind === 300 /* NotEmittedStatement */;
     }
     ts.isNotEmittedStatement = isNotEmittedStatement;
+    /* @internal */
     function isNotEmittedOrPartiallyEmittedNode(node) {
         return isNotEmittedStatement(node)
             || isPartiallyEmittedExpression(node);
@@ -12716,152 +13343,169 @@ var ts;
     ts.isNotEmittedOrPartiallyEmittedNode = isNotEmittedOrPartiallyEmittedNode;
     function isIterationStatement(node, lookInLabeledStatements) {
         switch (node.kind) {
-            case 220:
-            case 221:
-            case 222:
-            case 218:
-            case 219:
+            case 220 /* ForStatement */:
+            case 221 /* ForInStatement */:
+            case 222 /* ForOfStatement */:
+            case 218 /* DoStatement */:
+            case 219 /* WhileStatement */:
                 return true;
-            case 228:
+            case 228 /* LabeledStatement */:
                 return lookInLabeledStatements && isIterationStatement(node.statement, lookInLabeledStatements);
         }
         return false;
     }
     ts.isIterationStatement = isIterationStatement;
+    /* @internal */
     function isForInOrOfStatement(node) {
-        return node.kind === 221 || node.kind === 222;
+        return node.kind === 221 /* ForInStatement */ || node.kind === 222 /* ForOfStatement */;
     }
     ts.isForInOrOfStatement = isForInOrOfStatement;
+    // Element
+    /* @internal */
     function isConciseBody(node) {
         return ts.isBlock(node)
             || isExpression(node);
     }
     ts.isConciseBody = isConciseBody;
+    /* @internal */
     function isFunctionBody(node) {
         return ts.isBlock(node);
     }
     ts.isFunctionBody = isFunctionBody;
+    /* @internal */
     function isForInitializer(node) {
         return ts.isVariableDeclarationList(node)
             || isExpression(node);
     }
     ts.isForInitializer = isForInitializer;
+    /* @internal */
     function isModuleBody(node) {
         var kind = node.kind;
-        return kind === 240
-            || kind === 239
-            || kind === 71;
+        return kind === 240 /* ModuleBlock */
+            || kind === 239 /* ModuleDeclaration */
+            || kind === 71 /* Identifier */;
     }
     ts.isModuleBody = isModuleBody;
+    /* @internal */
     function isNamespaceBody(node) {
         var kind = node.kind;
-        return kind === 240
-            || kind === 239;
+        return kind === 240 /* ModuleBlock */
+            || kind === 239 /* ModuleDeclaration */;
     }
     ts.isNamespaceBody = isNamespaceBody;
+    /* @internal */
     function isJSDocNamespaceBody(node) {
         var kind = node.kind;
-        return kind === 71
-            || kind === 239;
+        return kind === 71 /* Identifier */
+            || kind === 239 /* ModuleDeclaration */;
     }
     ts.isJSDocNamespaceBody = isJSDocNamespaceBody;
+    /* @internal */
     function isNamedImportBindings(node) {
         var kind = node.kind;
-        return kind === 247
-            || kind === 246;
+        return kind === 247 /* NamedImports */
+            || kind === 246 /* NamespaceImport */;
     }
     ts.isNamedImportBindings = isNamedImportBindings;
+    /* @internal */
     function isModuleOrEnumDeclaration(node) {
-        return node.kind === 239 || node.kind === 238;
+        return node.kind === 239 /* ModuleDeclaration */ || node.kind === 238 /* EnumDeclaration */;
     }
     ts.isModuleOrEnumDeclaration = isModuleOrEnumDeclaration;
     function isDeclarationKind(kind) {
-        return kind === 193
-            || kind === 182
-            || kind === 235
-            || kind === 205
-            || kind === 155
-            || kind === 238
-            || kind === 273
-            || kind === 252
-            || kind === 234
-            || kind === 192
-            || kind === 156
-            || kind === 245
-            || kind === 243
-            || kind === 248
-            || kind === 236
-            || kind === 262
-            || kind === 154
-            || kind === 153
-            || kind === 239
-            || kind === 242
-            || kind === 246
-            || kind === 149
-            || kind === 270
-            || kind === 152
-            || kind === 151
-            || kind === 157
-            || kind === 271
-            || kind === 237
-            || kind === 148
-            || kind === 232
-            || kind === 297
-            || kind === 292
-            || kind === 298;
+        return kind === 193 /* ArrowFunction */
+            || kind === 182 /* BindingElement */
+            || kind === 235 /* ClassDeclaration */
+            || kind === 205 /* ClassExpression */
+            || kind === 155 /* Constructor */
+            || kind === 238 /* EnumDeclaration */
+            || kind === 273 /* EnumMember */
+            || kind === 252 /* ExportSpecifier */
+            || kind === 234 /* FunctionDeclaration */
+            || kind === 192 /* FunctionExpression */
+            || kind === 156 /* GetAccessor */
+            || kind === 245 /* ImportClause */
+            || kind === 243 /* ImportEqualsDeclaration */
+            || kind === 248 /* ImportSpecifier */
+            || kind === 236 /* InterfaceDeclaration */
+            || kind === 262 /* JsxAttribute */
+            || kind === 154 /* MethodDeclaration */
+            || kind === 153 /* MethodSignature */
+            || kind === 239 /* ModuleDeclaration */
+            || kind === 242 /* NamespaceExportDeclaration */
+            || kind === 246 /* NamespaceImport */
+            || kind === 149 /* Parameter */
+            || kind === 270 /* PropertyAssignment */
+            || kind === 152 /* PropertyDeclaration */
+            || kind === 151 /* PropertySignature */
+            || kind === 157 /* SetAccessor */
+            || kind === 271 /* ShorthandPropertyAssignment */
+            || kind === 237 /* TypeAliasDeclaration */
+            || kind === 148 /* TypeParameter */
+            || kind === 232 /* VariableDeclaration */
+            || kind === 297 /* JSDocTypedefTag */
+            || kind === 292 /* JSDocCallbackTag */
+            || kind === 298 /* JSDocPropertyTag */;
     }
     function isDeclarationStatementKind(kind) {
-        return kind === 234
-            || kind === 253
-            || kind === 235
-            || kind === 236
-            || kind === 237
-            || kind === 238
-            || kind === 239
-            || kind === 244
-            || kind === 243
-            || kind === 250
-            || kind === 249
-            || kind === 242;
+        return kind === 234 /* FunctionDeclaration */
+            || kind === 253 /* MissingDeclaration */
+            || kind === 235 /* ClassDeclaration */
+            || kind === 236 /* InterfaceDeclaration */
+            || kind === 237 /* TypeAliasDeclaration */
+            || kind === 238 /* EnumDeclaration */
+            || kind === 239 /* ModuleDeclaration */
+            || kind === 244 /* ImportDeclaration */
+            || kind === 243 /* ImportEqualsDeclaration */
+            || kind === 250 /* ExportDeclaration */
+            || kind === 249 /* ExportAssignment */
+            || kind === 242 /* NamespaceExportDeclaration */;
     }
     function isStatementKindButNotDeclarationKind(kind) {
-        return kind === 224
-            || kind === 223
-            || kind === 231
-            || kind === 218
-            || kind === 216
-            || kind === 215
-            || kind === 221
-            || kind === 222
-            || kind === 220
-            || kind === 217
-            || kind === 228
-            || kind === 225
-            || kind === 227
-            || kind === 229
-            || kind === 230
-            || kind === 214
-            || kind === 219
-            || kind === 226
-            || kind === 300
-            || kind === 304
-            || kind === 303;
+        return kind === 224 /* BreakStatement */
+            || kind === 223 /* ContinueStatement */
+            || kind === 231 /* DebuggerStatement */
+            || kind === 218 /* DoStatement */
+            || kind === 216 /* ExpressionStatement */
+            || kind === 215 /* EmptyStatement */
+            || kind === 221 /* ForInStatement */
+            || kind === 222 /* ForOfStatement */
+            || kind === 220 /* ForStatement */
+            || kind === 217 /* IfStatement */
+            || kind === 228 /* LabeledStatement */
+            || kind === 225 /* ReturnStatement */
+            || kind === 227 /* SwitchStatement */
+            || kind === 229 /* ThrowStatement */
+            || kind === 230 /* TryStatement */
+            || kind === 214 /* VariableStatement */
+            || kind === 219 /* WhileStatement */
+            || kind === 226 /* WithStatement */
+            || kind === 300 /* NotEmittedStatement */
+            || kind === 304 /* EndOfDeclarationMarker */
+            || kind === 303 /* MergeDeclarationMarker */;
     }
+    /* @internal */
     function isDeclaration(node) {
-        if (node.kind === 148) {
-            return node.parent.kind !== 296 || ts.isInJavaScriptFile(node);
+        if (node.kind === 148 /* TypeParameter */) {
+            return node.parent.kind !== 296 /* JSDocTemplateTag */ || ts.isInJavaScriptFile(node);
         }
         return isDeclarationKind(node.kind);
     }
     ts.isDeclaration = isDeclaration;
+    /* @internal */
     function isDeclarationStatement(node) {
         return isDeclarationStatementKind(node.kind);
     }
     ts.isDeclarationStatement = isDeclarationStatement;
+    /**
+     * Determines whether the node is a statement that is not also a declaration
+     */
+    /* @internal */
     function isStatementButNotDeclaration(node) {
         return isStatementKindButNotDeclarationKind(node.kind);
     }
     ts.isStatementButNotDeclaration = isStatementButNotDeclaration;
+    /* @internal */
     function isStatement(node) {
         var kind = node.kind;
         return isStatementKindButNotDeclarationKind(kind)
@@ -12870,156 +13514,183 @@ var ts;
     }
     ts.isStatement = isStatement;
     function isBlockStatement(node) {
-        if (node.kind !== 213)
+        if (node.kind !== 213 /* Block */)
             return false;
         if (node.parent !== undefined) {
-            if (node.parent.kind === 230 || node.parent.kind === 269) {
+            if (node.parent.kind === 230 /* TryStatement */ || node.parent.kind === 269 /* CatchClause */) {
                 return false;
             }
         }
         return !ts.isFunctionBlock(node);
     }
+    // Module references
+    /* @internal */
     function isModuleReference(node) {
         var kind = node.kind;
-        return kind === 254
-            || kind === 146
-            || kind === 71;
+        return kind === 254 /* ExternalModuleReference */
+            || kind === 146 /* QualifiedName */
+            || kind === 71 /* Identifier */;
     }
     ts.isModuleReference = isModuleReference;
+    // JSX
+    /* @internal */
     function isJsxTagNameExpression(node) {
         var kind = node.kind;
-        return kind === 99
-            || kind === 71
-            || kind === 185;
+        return kind === 99 /* ThisKeyword */
+            || kind === 71 /* Identifier */
+            || kind === 185 /* PropertyAccessExpression */;
     }
     ts.isJsxTagNameExpression = isJsxTagNameExpression;
+    /* @internal */
     function isJsxChild(node) {
         var kind = node.kind;
-        return kind === 255
-            || kind === 265
-            || kind === 256
-            || kind === 10
-            || kind === 259;
+        return kind === 255 /* JsxElement */
+            || kind === 265 /* JsxExpression */
+            || kind === 256 /* JsxSelfClosingElement */
+            || kind === 10 /* JsxText */
+            || kind === 259 /* JsxFragment */;
     }
     ts.isJsxChild = isJsxChild;
+    /* @internal */
     function isJsxAttributeLike(node) {
         var kind = node.kind;
-        return kind === 262
-            || kind === 264;
+        return kind === 262 /* JsxAttribute */
+            || kind === 264 /* JsxSpreadAttribute */;
     }
     ts.isJsxAttributeLike = isJsxAttributeLike;
+    /* @internal */
     function isStringLiteralOrJsxExpression(node) {
         var kind = node.kind;
-        return kind === 9
-            || kind === 265;
+        return kind === 9 /* StringLiteral */
+            || kind === 265 /* JsxExpression */;
     }
     ts.isStringLiteralOrJsxExpression = isStringLiteralOrJsxExpression;
     function isJsxOpeningLikeElement(node) {
         var kind = node.kind;
-        return kind === 257
-            || kind === 256;
+        return kind === 257 /* JsxOpeningElement */
+            || kind === 256 /* JsxSelfClosingElement */;
     }
     ts.isJsxOpeningLikeElement = isJsxOpeningLikeElement;
+    // Clauses
     function isCaseOrDefaultClause(node) {
         var kind = node.kind;
-        return kind === 266
-            || kind === 267;
+        return kind === 266 /* CaseClause */
+            || kind === 267 /* DefaultClause */;
     }
     ts.isCaseOrDefaultClause = isCaseOrDefaultClause;
+    // JSDoc
+    /** True if node is of some JSDoc syntax kind. */
+    /* @internal */
     function isJSDocNode(node) {
-        return node.kind >= 278 && node.kind <= 298;
+        return node.kind >= 278 /* FirstJSDocNode */ && node.kind <= 298 /* LastJSDocNode */;
     }
     ts.isJSDocNode = isJSDocNode;
+    /** True if node is of a kind that may contain comment text. */
     function isJSDocCommentContainingNode(node) {
-        return node.kind === 286 || isJSDocTag(node) || ts.isJSDocTypeLiteral(node) || ts.isJSDocSignature(node);
+        return node.kind === 286 /* JSDocComment */ || isJSDocTag(node) || ts.isJSDocTypeLiteral(node) || ts.isJSDocSignature(node);
     }
     ts.isJSDocCommentContainingNode = isJSDocCommentContainingNode;
+    // TODO: determine what this does before making it public.
+    /* @internal */
     function isJSDocTag(node) {
-        return node.kind >= 289 && node.kind <= 298;
+        return node.kind >= 289 /* FirstJSDocTagNode */ && node.kind <= 298 /* LastJSDocTagNode */;
     }
     ts.isJSDocTag = isJSDocTag;
     function isSetAccessor(node) {
-        return node.kind === 157;
+        return node.kind === 157 /* SetAccessor */;
     }
     ts.isSetAccessor = isSetAccessor;
     function isGetAccessor(node) {
-        return node.kind === 156;
+        return node.kind === 156 /* GetAccessor */;
     }
     ts.isGetAccessor = isGetAccessor;
+    /** True if has jsdoc nodes attached to it. */
+    /* @internal */
+    // TODO: GH#19856 Would like to return `node is Node & { jsDoc: JSDoc[] }` but it causes long compile times
     function hasJSDocNodes(node) {
         var jsDoc = node.jsDoc;
         return !!jsDoc && jsDoc.length > 0;
     }
     ts.hasJSDocNodes = hasJSDocNodes;
+    /** True if has type node attached to it. */
+    /* @internal */
     function hasType(node) {
         return !!node.type;
     }
     ts.hasType = hasType;
+    /* True if the node could have a type node a `.type` */
+    /* @internal */
     function couldHaveType(node) {
         switch (node.kind) {
-            case 149:
-            case 151:
-            case 152:
-            case 153:
-            case 154:
-            case 155:
-            case 156:
-            case 157:
-            case 158:
-            case 159:
-            case 160:
-            case 161:
-            case 163:
-            case 164:
-            case 173:
-            case 175:
-            case 177:
-            case 190:
-            case 192:
-            case 193:
-            case 208:
-            case 232:
-            case 234:
-            case 237:
-            case 278:
-            case 281:
-            case 282:
-            case 283:
-            case 284:
-            case 285:
+            case 149 /* Parameter */:
+            case 151 /* PropertySignature */:
+            case 152 /* PropertyDeclaration */:
+            case 153 /* MethodSignature */:
+            case 154 /* MethodDeclaration */:
+            case 155 /* Constructor */:
+            case 156 /* GetAccessor */:
+            case 157 /* SetAccessor */:
+            case 158 /* CallSignature */:
+            case 159 /* ConstructSignature */:
+            case 160 /* IndexSignature */:
+            case 161 /* TypePredicate */:
+            case 163 /* FunctionType */:
+            case 164 /* ConstructorType */:
+            case 173 /* ParenthesizedType */:
+            case 175 /* TypeOperator */:
+            case 177 /* MappedType */:
+            case 190 /* TypeAssertionExpression */:
+            case 192 /* FunctionExpression */:
+            case 193 /* ArrowFunction */:
+            case 208 /* AsExpression */:
+            case 232 /* VariableDeclaration */:
+            case 234 /* FunctionDeclaration */:
+            case 237 /* TypeAliasDeclaration */:
+            case 278 /* JSDocTypeExpression */:
+            case 281 /* JSDocNullableType */:
+            case 282 /* JSDocNonNullableType */:
+            case 283 /* JSDocOptionalType */:
+            case 284 /* JSDocFunctionType */:
+            case 285 /* JSDocVariadicType */:
                 return true;
         }
         return false;
     }
     ts.couldHaveType = couldHaveType;
+    /** True if has initializer node attached to it. */
+    /* @internal */
     function hasInitializer(node) {
         return !!node.initializer;
     }
     ts.hasInitializer = hasInitializer;
+    /** True if has initializer node attached to it. */
+    /* @internal */
     function hasOnlyExpressionInitializer(node) {
         return hasInitializer(node) && !ts.isForStatement(node) && !ts.isForInStatement(node) && !ts.isForOfStatement(node) && !ts.isJsxAttribute(node);
     }
     ts.hasOnlyExpressionInitializer = hasOnlyExpressionInitializer;
     function isObjectLiteralElement(node) {
         switch (node.kind) {
-            case 262:
-            case 264:
-            case 270:
-            case 271:
-            case 154:
-            case 156:
-            case 157:
+            case 262 /* JsxAttribute */:
+            case 264 /* JsxSpreadAttribute */:
+            case 270 /* PropertyAssignment */:
+            case 271 /* ShorthandPropertyAssignment */:
+            case 154 /* MethodDeclaration */:
+            case 156 /* GetAccessor */:
+            case 157 /* SetAccessor */:
                 return true;
             default:
                 return false;
         }
     }
     ts.isObjectLiteralElement = isObjectLiteralElement;
+    /* @internal */
     function isTypeReferenceType(node) {
-        return node.kind === 162 || node.kind === 207;
+        return node.kind === 162 /* TypeReference */ || node.kind === 207 /* ExpressionWithTypeArguments */;
     }
     ts.isTypeReferenceType = isTypeReferenceType;
     var MAX_SMI_X86 = 1073741823;
+    /* @internal */
     function guessIndentation(lines) {
         var indentation = MAX_SMI_X86;
         for (var _i = 0, lines_1 = lines; _i < lines_1.length; _i++) {
@@ -13044,13 +13715,1238 @@ var ts;
     }
     ts.guessIndentation = guessIndentation;
     function isStringLiteralLike(node) {
-        return node.kind === 9 || node.kind === 13;
+        return node.kind === 9 /* StringLiteral */ || node.kind === 13 /* NoSubstitutionTemplateLiteral */;
     }
     ts.isStringLiteralLike = isStringLiteralLike;
+    /** @internal */
     function isNamedImportsOrExports(node) {
-        return node.kind === 247 || node.kind === 251;
+        return node.kind === 247 /* NamedImports */ || node.kind === 251 /* NamedExports */;
     }
     ts.isNamedImportsOrExports = isNamedImportsOrExports;
+    function Symbol(flags, name) {
+        this.flags = flags;
+        this.escapedName = name;
+        this.declarations = undefined;
+        this.valueDeclaration = undefined;
+        this.id = undefined;
+        this.mergeId = undefined;
+        this.parent = undefined;
+    }
+    function Type(checker, flags) {
+        this.flags = flags;
+        if (Debug.isDebugging) {
+            this.checker = checker;
+        }
+    }
+    function Signature() { } // tslint:disable-line no-empty
+    function Node(kind, pos, end) {
+        this.pos = pos;
+        this.end = end;
+        this.kind = kind;
+        this.id = 0;
+        this.flags = 0 /* None */;
+        this.modifierFlagsCache = 0 /* None */;
+        this.transformFlags = 0 /* None */;
+        this.parent = undefined;
+        this.original = undefined;
+    }
+    function SourceMapSource(fileName, text, skipTrivia) {
+        this.fileName = fileName;
+        this.text = text;
+        this.skipTrivia = skipTrivia || (function (pos) { return pos; });
+    }
+    ts.objectAllocator = {
+        getNodeConstructor: function () { return Node; },
+        getTokenConstructor: function () { return Node; },
+        getIdentifierConstructor: function () { return Node; },
+        getSourceFileConstructor: function () { return Node; },
+        getSymbolConstructor: function () { return Symbol; },
+        getTypeConstructor: function () { return Type; },
+        getSignatureConstructor: function () { return Signature; },
+        getSourceMapSourceConstructor: function () { return SourceMapSource; },
+    };
+    function formatStringFromArgs(text, args, baseIndex) {
+        if (baseIndex === void 0) { baseIndex = 0; }
+        return text.replace(/{(\d+)}/g, function (_match, index) { return Debug.assertDefined(args[+index + baseIndex]); });
+    }
+    ts.formatStringFromArgs = formatStringFromArgs;
+    function getLocaleSpecificMessage(message) {
+        return ts.localizedDiagnosticMessages && ts.localizedDiagnosticMessages[message.key] || message.message;
+    }
+    ts.getLocaleSpecificMessage = getLocaleSpecificMessage;
+    function createFileDiagnostic(file, start, length, message) {
+        Debug.assertGreaterThanOrEqual(start, 0);
+        Debug.assertGreaterThanOrEqual(length, 0);
+        if (file) {
+            Debug.assertLessThanOrEqual(start, file.text.length);
+            Debug.assertLessThanOrEqual(start + length, file.text.length);
+        }
+        var text = getLocaleSpecificMessage(message);
+        if (arguments.length > 4) {
+            text = formatStringFromArgs(text, arguments, 4);
+        }
+        return {
+            file: file,
+            start: start,
+            length: length,
+            messageText: text,
+            category: message.category,
+            code: message.code,
+            reportsUnnecessary: message.reportsUnnecessary,
+        };
+    }
+    ts.createFileDiagnostic = createFileDiagnostic;
+    /* @internal */
+    function formatMessage(_dummy, message) {
+        var text = getLocaleSpecificMessage(message);
+        if (arguments.length > 2) {
+            text = formatStringFromArgs(text, arguments, 2);
+        }
+        return text;
+    }
+    ts.formatMessage = formatMessage;
+    function createCompilerDiagnostic(message) {
+        var text = getLocaleSpecificMessage(message);
+        if (arguments.length > 1) {
+            text = formatStringFromArgs(text, arguments, 1);
+        }
+        return {
+            file: undefined,
+            start: undefined,
+            length: undefined,
+            messageText: text,
+            category: message.category,
+            code: message.code,
+            reportsUnnecessary: message.reportsUnnecessary,
+        };
+    }
+    ts.createCompilerDiagnostic = createCompilerDiagnostic;
+    function createCompilerDiagnosticFromMessageChain(chain) {
+        return {
+            file: undefined,
+            start: undefined,
+            length: undefined,
+            code: chain.code,
+            category: chain.category,
+            messageText: chain.next ? chain : chain.messageText,
+        };
+    }
+    ts.createCompilerDiagnosticFromMessageChain = createCompilerDiagnosticFromMessageChain;
+    function chainDiagnosticMessages(details, message) {
+        var text = getLocaleSpecificMessage(message);
+        if (arguments.length > 2) {
+            text = formatStringFromArgs(text, arguments, 2);
+        }
+        return {
+            messageText: text,
+            category: message.category,
+            code: message.code,
+            next: details
+        };
+    }
+    ts.chainDiagnosticMessages = chainDiagnosticMessages;
+    function concatenateDiagnosticMessageChains(headChain, tailChain) {
+        var lastChain = headChain;
+        while (lastChain.next) {
+            lastChain = lastChain.next;
+        }
+        lastChain.next = tailChain;
+        return headChain;
+    }
+    ts.concatenateDiagnosticMessageChains = concatenateDiagnosticMessageChains;
+    function getDiagnosticFilePath(diagnostic) {
+        return diagnostic.file ? diagnostic.file.path : undefined;
+    }
+    function compareDiagnostics(d1, d2) {
+        return ts.compareStringsCaseSensitive(getDiagnosticFilePath(d1), getDiagnosticFilePath(d2)) ||
+            ts.compareValues(d1.start, d2.start) ||
+            ts.compareValues(d1.length, d2.length) ||
+            ts.compareValues(d1.code, d2.code) ||
+            compareMessageText(d1.messageText, d2.messageText) ||
+            0 /* EqualTo */;
+    }
+    ts.compareDiagnostics = compareDiagnostics;
+    function compareMessageText(t1, t2) {
+        var text1 = t1;
+        var text2 = t2;
+        while (text1 && text2) {
+            // We still have both chains.
+            var string1 = ts.isString(text1) ? text1 : text1.messageText;
+            var string2 = ts.isString(text2) ? text2 : text2.messageText;
+            var res = ts.compareStringsCaseSensitive(string1, string2);
+            if (res) {
+                return res;
+            }
+            text1 = ts.isString(text1) ? undefined : text1.next;
+            text2 = ts.isString(text2) ? undefined : text2.next;
+        }
+        if (!text1 && !text2) {
+            // if the chains are done, then these messages are the same.
+            return 0 /* EqualTo */;
+        }
+        // We still have one chain remaining.  The shorter chain should come first.
+        return text1 ? 1 /* GreaterThan */ : -1 /* LessThan */;
+    }
+    function getEmitScriptTarget(compilerOptions) {
+        return compilerOptions.target || 0 /* ES3 */;
+    }
+    ts.getEmitScriptTarget = getEmitScriptTarget;
+    function getEmitModuleKind(compilerOptions) {
+        return typeof compilerOptions.module === "number" ?
+            compilerOptions.module :
+            getEmitScriptTarget(compilerOptions) >= 2 /* ES2015 */ ? ts.ModuleKind.ES2015 : ts.ModuleKind.CommonJS;
+    }
+    ts.getEmitModuleKind = getEmitModuleKind;
+    function getEmitModuleResolutionKind(compilerOptions) {
+        var moduleResolution = compilerOptions.moduleResolution;
+        if (moduleResolution === undefined) {
+            moduleResolution = getEmitModuleKind(compilerOptions) === ts.ModuleKind.CommonJS ? ts.ModuleResolutionKind.NodeJs : ts.ModuleResolutionKind.Classic;
+        }
+        return moduleResolution;
+    }
+    ts.getEmitModuleResolutionKind = getEmitModuleResolutionKind;
+    function unreachableCodeIsError(options) {
+        return options.allowUnreachableCode === false;
+    }
+    ts.unreachableCodeIsError = unreachableCodeIsError;
+    function unusedLabelIsError(options) {
+        return options.allowUnusedLabels === false;
+    }
+    ts.unusedLabelIsError = unusedLabelIsError;
+    function getAreDeclarationMapsEnabled(options) {
+        return !!(options.declaration && options.declarationMap);
+    }
+    ts.getAreDeclarationMapsEnabled = getAreDeclarationMapsEnabled;
+    function getAllowSyntheticDefaultImports(compilerOptions) {
+        var moduleKind = getEmitModuleKind(compilerOptions);
+        return compilerOptions.allowSyntheticDefaultImports !== undefined
+            ? compilerOptions.allowSyntheticDefaultImports
+            : compilerOptions.esModuleInterop
+                ? moduleKind !== ts.ModuleKind.None && moduleKind < ts.ModuleKind.ES2015
+                : moduleKind === ts.ModuleKind.System;
+    }
+    ts.getAllowSyntheticDefaultImports = getAllowSyntheticDefaultImports;
+    function getEmitDeclarations(compilerOptions) {
+        return !!(compilerOptions.declaration || compilerOptions.composite);
+    }
+    ts.getEmitDeclarations = getEmitDeclarations;
+    function getStrictOptionValue(compilerOptions, flag) {
+        return compilerOptions[flag] === undefined ? !!compilerOptions.strict : !!compilerOptions[flag];
+    }
+    ts.getStrictOptionValue = getStrictOptionValue;
+    function hasZeroOrOneAsteriskCharacter(str) {
+        var seenAsterisk = false;
+        for (var i = 0; i < str.length; i++) {
+            if (str.charCodeAt(i) === 42 /* asterisk */) {
+                if (!seenAsterisk) {
+                    seenAsterisk = true;
+                }
+                else {
+                    // have already seen asterisk
+                    return false;
+                }
+            }
+        }
+        return true;
+    }
+    ts.hasZeroOrOneAsteriskCharacter = hasZeroOrOneAsteriskCharacter;
+    /**
+     * Internally, we represent paths as strings with '/' as the directory separator.
+     * When we make system calls (eg: LanguageServiceHost.getDirectory()),
+     * we expect the host to correctly handle paths in our specified format.
+     */
+    ts.directorySeparator = "/";
+    var altDirectorySeparator = "\\";
+    var urlSchemeSeparator = "://";
+    var backslashRegExp = /\\/g;
+    /**
+     * Normalize path separators.
+     */
+    function normalizeSlashes(path) {
+        return path.replace(backslashRegExp, ts.directorySeparator);
+    }
+    ts.normalizeSlashes = normalizeSlashes;
+    function isVolumeCharacter(charCode) {
+        return (charCode >= 97 /* a */ && charCode <= 122 /* z */) ||
+            (charCode >= 65 /* A */ && charCode <= 90 /* Z */);
+    }
+    function getFileUrlVolumeSeparatorEnd(url, start) {
+        var ch0 = url.charCodeAt(start);
+        if (ch0 === 58 /* colon */)
+            return start + 1;
+        if (ch0 === 37 /* percent */ && url.charCodeAt(start + 1) === 51 /* _3 */) {
+            var ch2 = url.charCodeAt(start + 2);
+            if (ch2 === 97 /* a */ || ch2 === 65 /* A */)
+                return start + 3;
+        }
+        return -1;
+    }
+    /**
+     * Returns length of the root part of a path or URL (i.e. length of "/", "x:/", "//server/share/, file:///user/files").
+     * If the root is part of a URL, the twos-complement of the root length is returned.
+     */
+    function getEncodedRootLength(path) {
+        if (!path)
+            return 0;
+        var ch0 = path.charCodeAt(0);
+        // POSIX or UNC
+        if (ch0 === 47 /* slash */ || ch0 === 92 /* backslash */) {
+            if (path.charCodeAt(1) !== ch0)
+                return 1; // POSIX: "/" (or non-normalized "\")
+            var p1 = path.indexOf(ch0 === 47 /* slash */ ? ts.directorySeparator : altDirectorySeparator, 2);
+            if (p1 < 0)
+                return path.length; // UNC: "//server" or "\\server"
+            return p1 + 1; // UNC: "//server/" or "\\server\"
+        }
+        // DOS
+        if (isVolumeCharacter(ch0) && path.charCodeAt(1) === 58 /* colon */) {
+            var ch2 = path.charCodeAt(2);
+            if (ch2 === 47 /* slash */ || ch2 === 92 /* backslash */)
+                return 3; // DOS: "c:/" or "c:\"
+            if (path.length === 2)
+                return 2; // DOS: "c:" (but not "c:d")
+        }
+        // URL
+        var schemeEnd = path.indexOf(urlSchemeSeparator);
+        if (schemeEnd !== -1) {
+            var authorityStart = schemeEnd + urlSchemeSeparator.length;
+            var authorityEnd = path.indexOf(ts.directorySeparator, authorityStart);
+            if (authorityEnd !== -1) { // URL: "file:///", "file://server/", "file://server/path"
+                // For local "file" URLs, include the leading DOS volume (if present).
+                // Per https://www.ietf.org/rfc/rfc1738.txt, a host of "" or "localhost" is a
+                // special case interpreted as "the machine from which the URL is being interpreted".
+                var scheme = path.slice(0, schemeEnd);
+                var authority = path.slice(authorityStart, authorityEnd);
+                if (scheme === "file" && (authority === "" || authority === "localhost") &&
+                    isVolumeCharacter(path.charCodeAt(authorityEnd + 1))) {
+                    var volumeSeparatorEnd = getFileUrlVolumeSeparatorEnd(path, authorityEnd + 2);
+                    if (volumeSeparatorEnd !== -1) {
+                        if (path.charCodeAt(volumeSeparatorEnd) === 47 /* slash */) {
+                            // URL: "file:///c:/", "file://localhost/c:/", "file:///c%3a/", "file://localhost/c%3a/"
+                            return ~(volumeSeparatorEnd + 1);
+                        }
+                        if (volumeSeparatorEnd === path.length) {
+                            // URL: "file:///c:", "file://localhost/c:", "file:///c$3a", "file://localhost/c%3a"
+                            // but not "file:///c:d" or "file:///c%3ad"
+                            return ~volumeSeparatorEnd;
+                        }
+                    }
+                }
+                return ~(authorityEnd + 1); // URL: "file://server/", "http://server/"
+            }
+            return ~path.length; // URL: "file://server", "http://server"
+        }
+        // relative
+        return 0;
+    }
+    /**
+     * Returns length of the root part of a path or URL (i.e. length of "/", "x:/", "//server/share/, file:///user/files").
+     *
+     * For example:
+     * ```ts
+     * getRootLength("a") === 0                   // ""
+     * getRootLength("/") === 1                   // "/"
+     * getRootLength("c:") === 2                  // "c:"
+     * getRootLength("c:d") === 0                 // ""
+     * getRootLength("c:/") === 3                 // "c:/"
+     * getRootLength("c:\\") === 3                // "c:\\"
+     * getRootLength("//server") === 7            // "//server"
+     * getRootLength("//server/share") === 8      // "//server/"
+     * getRootLength("\\\\server") === 7          // "\\\\server"
+     * getRootLength("\\\\server\\share") === 8   // "\\\\server\\"
+     * getRootLength("file:///path") === 8        // "file:///"
+     * getRootLength("file:///c:") === 10         // "file:///c:"
+     * getRootLength("file:///c:d") === 8         // "file:///"
+     * getRootLength("file:///c:/path") === 11    // "file:///c:/"
+     * getRootLength("file://server") === 13      // "file://server"
+     * getRootLength("file://server/path") === 14 // "file://server/"
+     * getRootLength("http://server") === 13      // "http://server"
+     * getRootLength("http://server/path") === 14 // "http://server/"
+     * ```
+     */
+    function getRootLength(path) {
+        var rootLength = getEncodedRootLength(path);
+        return rootLength < 0 ? ~rootLength : rootLength;
+    }
+    ts.getRootLength = getRootLength;
+    // TODO(rbuckton): replace references with `resolvePath`
+    function normalizePath(path) {
+        return resolvePath(path);
+    }
+    ts.normalizePath = normalizePath;
+    function normalizePathAndParts(path) {
+        path = normalizeSlashes(path);
+        var _a = reducePathComponents(getPathComponents(path)), root = _a[0], parts = _a.slice(1);
+        if (parts.length) {
+            var joinedParts = root + parts.join(ts.directorySeparator);
+            return { path: hasTrailingDirectorySeparator(path) ? ensureTrailingDirectorySeparator(joinedParts) : joinedParts, parts: parts };
+        }
+        else {
+            return { path: root, parts: parts };
+        }
+    }
+    ts.normalizePathAndParts = normalizePathAndParts;
+    function getDirectoryPath(path) {
+        path = normalizeSlashes(path);
+        // If the path provided is itself the root, then return it.
+        var rootLength = getRootLength(path);
+        if (rootLength === path.length)
+            return path;
+        // return the leading portion of the path up to the last (non-terminal) directory separator
+        // but not including any trailing directory separator.
+        path = removeTrailingDirectorySeparator(path);
+        return path.slice(0, Math.max(rootLength, path.lastIndexOf(ts.directorySeparator)));
+    }
+    ts.getDirectoryPath = getDirectoryPath;
+    function isUrl(path) {
+        return getEncodedRootLength(path) < 0;
+    }
+    ts.isUrl = isUrl;
+    function pathIsRelative(path) {
+        return /^\.\.?($|[\\/])/.test(path);
+    }
+    ts.pathIsRelative = pathIsRelative;
+    /**
+     * Determines whether a path is an absolute path (e.g. starts with `/`, or a dos path
+     * like `c:`, `c:\` or `c:/`).
+     */
+    function isRootedDiskPath(path) {
+        return getEncodedRootLength(path) > 0;
+    }
+    ts.isRootedDiskPath = isRootedDiskPath;
+    /**
+     * Determines whether a path consists only of a path root.
+     */
+    function isDiskPathRoot(path) {
+        var rootLength = getEncodedRootLength(path);
+        return rootLength > 0 && rootLength === path.length;
+    }
+    ts.isDiskPathRoot = isDiskPathRoot;
+    function convertToRelativePath(absoluteOrRelativePath, basePath, getCanonicalFileName) {
+        return !isRootedDiskPath(absoluteOrRelativePath)
+            ? absoluteOrRelativePath
+            : getRelativePathToDirectoryOrUrl(basePath, absoluteOrRelativePath, basePath, getCanonicalFileName, /*isAbsolutePathAnUrl*/ false);
+    }
+    ts.convertToRelativePath = convertToRelativePath;
+    function pathComponents(path, rootLength) {
+        var root = path.substring(0, rootLength);
+        var rest = path.substring(rootLength).split(ts.directorySeparator);
+        if (rest.length && !ts.lastOrUndefined(rest))
+            rest.pop();
+        return [root].concat(rest);
+    }
+    /**
+     * Parse a path into an array containing a root component (at index 0) and zero or more path
+     * components (at indices > 0). The result is not normalized.
+     * If the path is relative, the root component is `""`.
+     * If the path is absolute, the root component includes the first path separator (`/`).
+     */
+    function getPathComponents(path, currentDirectory) {
+        if (currentDirectory === void 0) { currentDirectory = ""; }
+        path = combinePaths(currentDirectory, path);
+        var rootLength = getRootLength(path);
+        return pathComponents(path, rootLength);
+    }
+    ts.getPathComponents = getPathComponents;
+    /**
+     * Reduce an array of path components to a more simplified path by navigating any
+     * `"."` or `".."` entries in the path.
+     */
+    function reducePathComponents(components) {
+        if (!ts.some(components))
+            return [];
+        var reduced = [components[0]];
+        for (var i = 1; i < components.length; i++) {
+            var component = components[i];
+            if (!component)
+                continue;
+            if (component === ".")
+                continue;
+            if (component === "..") {
+                if (reduced.length > 1) {
+                    if (reduced[reduced.length - 1] !== "..") {
+                        reduced.pop();
+                        continue;
+                    }
+                }
+                else if (reduced[0])
+                    continue;
+            }
+            reduced.push(component);
+        }
+        return reduced;
+    }
+    ts.reducePathComponents = reducePathComponents;
+    /**
+     * Parse a path into an array containing a root component (at index 0) and zero or more path
+     * components (at indices > 0). The result is normalized.
+     * If the path is relative, the root component is `""`.
+     * If the path is absolute, the root component includes the first path separator (`/`).
+     */
+    function getNormalizedPathComponents(path, currentDirectory) {
+        return reducePathComponents(getPathComponents(path, currentDirectory));
+    }
+    ts.getNormalizedPathComponents = getNormalizedPathComponents;
+    function getNormalizedAbsolutePath(fileName, currentDirectory) {
+        return getPathFromPathComponents(getNormalizedPathComponents(fileName, currentDirectory));
+    }
+    ts.getNormalizedAbsolutePath = getNormalizedAbsolutePath;
+    /**
+     * Formats a parsed path consisting of a root component (at index 0) and zero or more path
+     * segments (at indices > 0).
+     */
+    function getPathFromPathComponents(pathComponents) {
+        if (pathComponents.length === 0)
+            return "";
+        var root = pathComponents[0] && ensureTrailingDirectorySeparator(pathComponents[0]);
+        if (pathComponents.length === 1)
+            return root;
+        return root + pathComponents.slice(1).join(ts.directorySeparator);
+    }
+    ts.getPathFromPathComponents = getPathFromPathComponents;
+    function getPathComponentsRelativeTo(from, to, stringEqualityComparer, getCanonicalFileName) {
+        var fromComponents = reducePathComponents(getPathComponents(from));
+        var toComponents = reducePathComponents(getPathComponents(to));
+        var start;
+        for (start = 0; start < fromComponents.length && start < toComponents.length; start++) {
+            var fromComponent = getCanonicalFileName(fromComponents[start]);
+            var toComponent = getCanonicalFileName(toComponents[start]);
+            var comparer = start === 0 ? ts.equateStringsCaseInsensitive : stringEqualityComparer;
+            if (!comparer(fromComponent, toComponent))
+                break;
+        }
+        if (start === 0) {
+            return toComponents;
+        }
+        var components = toComponents.slice(start);
+        var relative = [];
+        for (; start < fromComponents.length; start++) {
+            relative.push("..");
+        }
+        return [""].concat(relative, components);
+    }
+    function getRelativePathFromFile(from, to, getCanonicalFileName) {
+        return ensurePathIsNonModuleName(getRelativePathFromDirectory(getDirectoryPath(from), to, getCanonicalFileName));
+    }
+    ts.getRelativePathFromFile = getRelativePathFromFile;
+    function getRelativePathFromDirectory(fromDirectory, to, getCanonicalFileNameOrIgnoreCase) {
+        Debug.assert((getRootLength(fromDirectory) > 0) === (getRootLength(to) > 0), "Paths must either both be absolute or both be relative");
+        var getCanonicalFileName = typeof getCanonicalFileNameOrIgnoreCase === "function" ? getCanonicalFileNameOrIgnoreCase : ts.identity;
+        var ignoreCase = typeof getCanonicalFileNameOrIgnoreCase === "boolean" ? getCanonicalFileNameOrIgnoreCase : false;
+        var pathComponents = getPathComponentsRelativeTo(fromDirectory, to, ignoreCase ? ts.equateStringsCaseInsensitive : ts.equateStringsCaseSensitive, getCanonicalFileName);
+        return getPathFromPathComponents(pathComponents);
+    }
+    ts.getRelativePathFromDirectory = getRelativePathFromDirectory;
+    function getRelativePathToDirectoryOrUrl(directoryPathOrUrl, relativeOrAbsolutePath, currentDirectory, getCanonicalFileName, isAbsolutePathAnUrl) {
+        var pathComponents = getPathComponentsRelativeTo(resolvePath(currentDirectory, directoryPathOrUrl), resolvePath(currentDirectory, relativeOrAbsolutePath), ts.equateStringsCaseSensitive, getCanonicalFileName);
+        var firstComponent = pathComponents[0];
+        if (isAbsolutePathAnUrl && isRootedDiskPath(firstComponent)) {
+            var prefix = firstComponent.charAt(0) === ts.directorySeparator ? "file://" : "file:///";
+            pathComponents[0] = prefix + firstComponent;
+        }
+        return getPathFromPathComponents(pathComponents);
+    }
+    ts.getRelativePathToDirectoryOrUrl = getRelativePathToDirectoryOrUrl;
+    /**
+     * Ensures a path is either absolute (prefixed with `/` or `c:`) or dot-relative (prefixed
+     * with `./` or `../`) so as not to be confused with an unprefixed module name.
+     */
+    function ensurePathIsNonModuleName(path) {
+        return getRootLength(path) === 0 && !pathIsRelative(path) ? "./" + path : path;
+    }
+    ts.ensurePathIsNonModuleName = ensurePathIsNonModuleName;
+    function getBaseFileName(path, extensions, ignoreCase) {
+        path = normalizeSlashes(path);
+        // if the path provided is itself the root, then it has not file name.
+        var rootLength = getRootLength(path);
+        if (rootLength === path.length)
+            return "";
+        // return the trailing portion of the path starting after the last (non-terminal) directory
+        // separator but not including any trailing directory separator.
+        path = removeTrailingDirectorySeparator(path);
+        var name = path.slice(Math.max(getRootLength(path), path.lastIndexOf(ts.directorySeparator) + 1));
+        var extension = extensions !== undefined && ignoreCase !== undefined ? getAnyExtensionFromPath(name, extensions, ignoreCase) : undefined;
+        return extension ? name.slice(0, name.length - extension.length) : name;
+    }
+    ts.getBaseFileName = getBaseFileName;
+    /**
+     * Combines paths. If a path is absolute, it replaces any previous path.
+     */
+    function combinePaths(path) {
+        var paths = [];
+        for (var _i = 1; _i < arguments.length; _i++) {
+            paths[_i - 1] = arguments[_i];
+        }
+        if (path)
+            path = normalizeSlashes(path);
+        for (var _a = 0, paths_1 = paths; _a < paths_1.length; _a++) {
+            var relativePath = paths_1[_a];
+            if (!relativePath)
+                continue;
+            relativePath = normalizeSlashes(relativePath);
+            if (!path || getRootLength(relativePath) !== 0) {
+                path = relativePath;
+            }
+            else {
+                path = ensureTrailingDirectorySeparator(path) + relativePath;
+            }
+        }
+        return path;
+    }
+    ts.combinePaths = combinePaths;
+    /**
+     * Combines and resolves paths. If a path is absolute, it replaces any previous path. Any
+     * `.` and `..` path components are resolved.
+     */
+    function resolvePath(path) {
+        var paths = [];
+        for (var _i = 1; _i < arguments.length; _i++) {
+            paths[_i - 1] = arguments[_i];
+        }
+        var combined = ts.some(paths) ? combinePaths.apply(void 0, [path].concat(paths)) : normalizeSlashes(path);
+        var normalized = getPathFromPathComponents(reducePathComponents(getPathComponents(combined)));
+        return normalized && hasTrailingDirectorySeparator(combined) ? ensureTrailingDirectorySeparator(normalized) : normalized;
+    }
+    ts.resolvePath = resolvePath;
+    /**
+     * Determines whether a path has a trailing separator (`/` or `\\`).
+     */
+    function hasTrailingDirectorySeparator(path) {
+        if (path.length === 0)
+            return false;
+        var ch = path.charCodeAt(path.length - 1);
+        return ch === 47 /* slash */ || ch === 92 /* backslash */;
+    }
+    ts.hasTrailingDirectorySeparator = hasTrailingDirectorySeparator;
+    function removeTrailingDirectorySeparator(path) {
+        if (hasTrailingDirectorySeparator(path)) {
+            return path.substr(0, path.length - 1);
+        }
+        return path;
+    }
+    ts.removeTrailingDirectorySeparator = removeTrailingDirectorySeparator;
+    function ensureTrailingDirectorySeparator(path) {
+        if (!hasTrailingDirectorySeparator(path)) {
+            return path + ts.directorySeparator;
+        }
+        return path;
+    }
+    ts.ensureTrailingDirectorySeparator = ensureTrailingDirectorySeparator;
+    function comparePathsWorker(a, b, componentComparer) {
+        if (a === b)
+            return 0 /* EqualTo */;
+        if (a === undefined)
+            return -1 /* LessThan */;
+        if (b === undefined)
+            return 1 /* GreaterThan */;
+        var aComponents = reducePathComponents(getPathComponents(a));
+        var bComponents = reducePathComponents(getPathComponents(b));
+        var sharedLength = Math.min(aComponents.length, bComponents.length);
+        for (var i = 0; i < sharedLength; i++) {
+            var stringComparer = i === 0 ? ts.compareStringsCaseInsensitive : componentComparer;
+            var result = stringComparer(aComponents[i], bComponents[i]);
+            if (result !== 0 /* EqualTo */) {
+                return result;
+            }
+        }
+        return ts.compareValues(aComponents.length, bComponents.length);
+    }
+    /**
+     * Performs a case-sensitive comparison of two paths.
+     */
+    function comparePathsCaseSensitive(a, b) {
+        return comparePathsWorker(a, b, ts.compareStringsCaseSensitive);
+    }
+    ts.comparePathsCaseSensitive = comparePathsCaseSensitive;
+    /**
+     * Performs a case-insensitive comparison of two paths.
+     */
+    function comparePathsCaseInsensitive(a, b) {
+        return comparePathsWorker(a, b, ts.compareStringsCaseInsensitive);
+    }
+    ts.comparePathsCaseInsensitive = comparePathsCaseInsensitive;
+    function comparePaths(a, b, currentDirectory, ignoreCase) {
+        if (typeof currentDirectory === "string") {
+            a = combinePaths(currentDirectory, a);
+            b = combinePaths(currentDirectory, b);
+        }
+        else if (typeof currentDirectory === "boolean") {
+            ignoreCase = currentDirectory;
+        }
+        return comparePathsWorker(a, b, ts.getStringComparer(ignoreCase));
+    }
+    ts.comparePaths = comparePaths;
+    function containsPath(parent, child, currentDirectory, ignoreCase) {
+        if (typeof currentDirectory === "string") {
+            parent = combinePaths(currentDirectory, parent);
+            child = combinePaths(currentDirectory, child);
+        }
+        else if (typeof currentDirectory === "boolean") {
+            ignoreCase = currentDirectory;
+        }
+        if (parent === undefined || child === undefined)
+            return false;
+        if (parent === child)
+            return true;
+        var parentComponents = reducePathComponents(getPathComponents(parent));
+        var childComponents = reducePathComponents(getPathComponents(child));
+        if (childComponents.length < parentComponents.length) {
+            return false;
+        }
+        var componentEqualityComparer = ignoreCase ? ts.equateStringsCaseInsensitive : ts.equateStringsCaseSensitive;
+        for (var i = 0; i < parentComponents.length; i++) {
+            var equalityComparer = i === 0 ? ts.equateStringsCaseInsensitive : componentEqualityComparer;
+            if (!equalityComparer(parentComponents[i], childComponents[i])) {
+                return false;
+            }
+        }
+        return true;
+    }
+    ts.containsPath = containsPath;
+    function tryRemoveDirectoryPrefix(path, dirPath) {
+        var a = ts.tryRemovePrefix(path, dirPath);
+        if (a === undefined)
+            return undefined;
+        switch (a.charCodeAt(0)) {
+            case 47 /* slash */:
+            case 92 /* backslash */:
+                return a.slice(1);
+            default:
+                return undefined;
+        }
+    }
+    ts.tryRemoveDirectoryPrefix = tryRemoveDirectoryPrefix;
+    // Reserved characters, forces escaping of any non-word (or digit), non-whitespace character.
+    // It may be inefficient (we could just match (/[-[\]{}()*+?.,\\^$|#\s]/g), but this is future
+    // proof.
+    var reservedCharacterPattern = /[^\w\s\/]/g;
+    var wildcardCharCodes = [42 /* asterisk */, 63 /* question */];
+    function hasExtension(fileName) {
+        return ts.stringContains(getBaseFileName(fileName), ".");
+    }
+    ts.hasExtension = hasExtension;
+    ts.commonPackageFolders = ["node_modules", "bower_components", "jspm_packages"];
+    var implicitExcludePathRegexPattern = "(?!(" + ts.commonPackageFolders.join("|") + ")(/|$))";
+    var filesMatcher = {
+        /**
+         * Matches any single directory segment unless it is the last segment and a .min.js file
+         * Breakdown:
+         *  [^./]                   # matches everything up to the first . character (excluding directory separators)
+         *  (\\.(?!min\\.js$))?     # matches . characters but not if they are part of the .min.js file extension
+         */
+        singleAsteriskRegexFragment: "([^./]|(\\.(?!min\\.js$))?)*",
+        /**
+         * Regex for the ** wildcard. Matches any number of subdirectories. When used for including
+         * files or directories, does not match subdirectories that start with a . character
+         */
+        doubleAsteriskRegexFragment: "(/" + implicitExcludePathRegexPattern + "[^/.][^/]*)*?",
+        replaceWildcardCharacter: function (match) { return replaceWildcardCharacter(match, filesMatcher.singleAsteriskRegexFragment); }
+    };
+    var directoriesMatcher = {
+        singleAsteriskRegexFragment: "[^/]*",
+        /**
+         * Regex for the ** wildcard. Matches any number of subdirectories. When used for including
+         * files or directories, does not match subdirectories that start with a . character
+         */
+        doubleAsteriskRegexFragment: "(/" + implicitExcludePathRegexPattern + "[^/.][^/]*)*?",
+        replaceWildcardCharacter: function (match) { return replaceWildcardCharacter(match, directoriesMatcher.singleAsteriskRegexFragment); }
+    };
+    var excludeMatcher = {
+        singleAsteriskRegexFragment: "[^/]*",
+        doubleAsteriskRegexFragment: "(/.+?)?",
+        replaceWildcardCharacter: function (match) { return replaceWildcardCharacter(match, excludeMatcher.singleAsteriskRegexFragment); }
+    };
+    var wildcardMatchers = {
+        files: filesMatcher,
+        directories: directoriesMatcher,
+        exclude: excludeMatcher
+    };
+    function getRegularExpressionForWildcard(specs, basePath, usage) {
+        var patterns = getRegularExpressionsForWildcards(specs, basePath, usage);
+        if (!patterns || !patterns.length) {
+            return undefined;
+        }
+        var pattern = patterns.map(function (pattern) { return "(" + pattern + ")"; }).join("|");
+        // If excluding, match "foo/bar/baz...", but if including, only allow "foo".
+        var terminator = usage === "exclude" ? "($|/)" : "$";
+        return "^(" + pattern + ")" + terminator;
+    }
+    ts.getRegularExpressionForWildcard = getRegularExpressionForWildcard;
+    function getRegularExpressionsForWildcards(specs, basePath, usage) {
+        if (specs === undefined || specs.length === 0) {
+            return undefined;
+        }
+        return ts.flatMap(specs, function (spec) {
+            return spec && getSubPatternFromSpec(spec, basePath, usage, wildcardMatchers[usage]);
+        });
+    }
+    /**
+     * An "includes" path "foo" is implicitly a glob "foo/** /*" (without the space) if its last component has no extension,
+     * and does not contain any glob characters itself.
+     */
+    function isImplicitGlob(lastPathComponent) {
+        return !/[.*?]/.test(lastPathComponent);
+    }
+    ts.isImplicitGlob = isImplicitGlob;
+    function getSubPatternFromSpec(spec, basePath, usage, _a) {
+        var singleAsteriskRegexFragment = _a.singleAsteriskRegexFragment, doubleAsteriskRegexFragment = _a.doubleAsteriskRegexFragment, replaceWildcardCharacter = _a.replaceWildcardCharacter;
+        var subpattern = "";
+        var hasWrittenComponent = false;
+        var components = getNormalizedPathComponents(spec, basePath);
+        var lastComponent = ts.last(components);
+        if (usage !== "exclude" && lastComponent === "**") {
+            return undefined;
+        }
+        // getNormalizedPathComponents includes the separator for the root component.
+        // We need to remove to create our regex correctly.
+        components[0] = removeTrailingDirectorySeparator(components[0]);
+        if (isImplicitGlob(lastComponent)) {
+            components.push("**", "*");
+        }
+        var optionalCount = 0;
+        for (var _i = 0, components_1 = components; _i < components_1.length; _i++) {
+            var component = components_1[_i];
+            if (component === "**") {
+                subpattern += doubleAsteriskRegexFragment;
+            }
+            else {
+                if (usage === "directories") {
+                    subpattern += "(";
+                    optionalCount++;
+                }
+                if (hasWrittenComponent) {
+                    subpattern += ts.directorySeparator;
+                }
+                if (usage !== "exclude") {
+                    var componentPattern = "";
+                    // The * and ? wildcards should not match directories or files that start with . if they
+                    // appear first in a component. Dotted directories and files can be included explicitly
+                    // like so: **/.*/.*
+                    if (component.charCodeAt(0) === 42 /* asterisk */) {
+                        componentPattern += "([^./]" + singleAsteriskRegexFragment + ")?";
+                        component = component.substr(1);
+                    }
+                    else if (component.charCodeAt(0) === 63 /* question */) {
+                        componentPattern += "[^./]";
+                        component = component.substr(1);
+                    }
+                    componentPattern += component.replace(reservedCharacterPattern, replaceWildcardCharacter);
+                    // Patterns should not include subfolders like node_modules unless they are
+                    // explicitly included as part of the path.
+                    //
+                    // As an optimization, if the component pattern is the same as the component,
+                    // then there definitely were no wildcard characters and we do not need to
+                    // add the exclusion pattern.
+                    if (componentPattern !== component) {
+                        subpattern += implicitExcludePathRegexPattern;
+                    }
+                    subpattern += componentPattern;
+                }
+                else {
+                    subpattern += component.replace(reservedCharacterPattern, replaceWildcardCharacter);
+                }
+            }
+            hasWrittenComponent = true;
+        }
+        while (optionalCount > 0) {
+            subpattern += ")?";
+            optionalCount--;
+        }
+        return subpattern;
+    }
+    function replaceWildcardCharacter(match, singleAsteriskRegexFragment) {
+        return match === "*" ? singleAsteriskRegexFragment : match === "?" ? "[^/]" : "\\" + match;
+    }
+    /** @param path directory of the tsconfig.json */
+    function getFileMatcherPatterns(path, excludes, includes, useCaseSensitiveFileNames, currentDirectory) {
+        path = normalizePath(path);
+        currentDirectory = normalizePath(currentDirectory);
+        var absolutePath = combinePaths(currentDirectory, path);
+        return {
+            includeFilePatterns: ts.map(getRegularExpressionsForWildcards(includes, absolutePath, "files"), function (pattern) { return "^" + pattern + "$"; }),
+            includeFilePattern: getRegularExpressionForWildcard(includes, absolutePath, "files"),
+            includeDirectoryPattern: getRegularExpressionForWildcard(includes, absolutePath, "directories"),
+            excludePattern: getRegularExpressionForWildcard(excludes, absolutePath, "exclude"),
+            basePaths: getBasePaths(path, includes, useCaseSensitiveFileNames)
+        };
+    }
+    ts.getFileMatcherPatterns = getFileMatcherPatterns;
+    function getRegexFromPattern(pattern, useCaseSensitiveFileNames) {
+        return new RegExp(pattern, useCaseSensitiveFileNames ? "" : "i");
+    }
+    ts.getRegexFromPattern = getRegexFromPattern;
+    /** @param path directory of the tsconfig.json */
+    function matchFiles(path, extensions, excludes, includes, useCaseSensitiveFileNames, currentDirectory, depth, getFileSystemEntries) {
+        path = normalizePath(path);
+        currentDirectory = normalizePath(currentDirectory);
+        var patterns = getFileMatcherPatterns(path, excludes, includes, useCaseSensitiveFileNames, currentDirectory);
+        var includeFileRegexes = patterns.includeFilePatterns && patterns.includeFilePatterns.map(function (pattern) { return getRegexFromPattern(pattern, useCaseSensitiveFileNames); });
+        var includeDirectoryRegex = patterns.includeDirectoryPattern && getRegexFromPattern(patterns.includeDirectoryPattern, useCaseSensitiveFileNames);
+        var excludeRegex = patterns.excludePattern && getRegexFromPattern(patterns.excludePattern, useCaseSensitiveFileNames);
+        // Associate an array of results with each include regex. This keeps results in order of the "include" order.
+        // If there are no "includes", then just put everything in results[0].
+        var results = includeFileRegexes ? includeFileRegexes.map(function () { return []; }) : [[]];
+        for (var _i = 0, _a = patterns.basePaths; _i < _a.length; _i++) {
+            var basePath = _a[_i];
+            visitDirectory(basePath, combinePaths(currentDirectory, basePath), depth);
+        }
+        return ts.flatten(results);
+        function visitDirectory(path, absolutePath, depth) {
+            var _a = getFileSystemEntries(path), files = _a.files, directories = _a.directories;
+            var _loop_1 = function (current) {
+                var name = combinePaths(path, current);
+                var absoluteName = combinePaths(absolutePath, current);
+                if (extensions && !ts.fileExtensionIsOneOf(name, extensions))
+                    return "continue";
+                if (excludeRegex && excludeRegex.test(absoluteName))
+                    return "continue";
+                if (!includeFileRegexes) {
+                    results[0].push(name);
+                }
+                else {
+                    var includeIndex = ts.findIndex(includeFileRegexes, function (re) { return re.test(absoluteName); });
+                    if (includeIndex !== -1) {
+                        results[includeIndex].push(name);
+                    }
+                }
+            };
+            for (var _i = 0, _b = ts.sort(files, ts.compareStringsCaseSensitive); _i < _b.length; _i++) {
+                var current = _b[_i];
+                _loop_1(current);
+            }
+            if (depth !== undefined) {
+                depth--;
+                if (depth === 0) {
+                    return;
+                }
+            }
+            for (var _c = 0, _d = ts.sort(directories, ts.compareStringsCaseSensitive); _c < _d.length; _c++) {
+                var current = _d[_c];
+                var name = combinePaths(path, current);
+                var absoluteName = combinePaths(absolutePath, current);
+                if ((!includeDirectoryRegex || includeDirectoryRegex.test(absoluteName)) &&
+                    (!excludeRegex || !excludeRegex.test(absoluteName))) {
+                    visitDirectory(name, absoluteName, depth);
+                }
+            }
+        }
+    }
+    ts.matchFiles = matchFiles;
+    /**
+     * Computes the unique non-wildcard base paths amongst the provided include patterns.
+     */
+    function getBasePaths(path, includes, useCaseSensitiveFileNames) {
+        // Storage for our results in the form of literal paths (e.g. the paths as written by the user).
+        var basePaths = [path];
+        if (includes) {
+            // Storage for literal base paths amongst the include patterns.
+            var includeBasePaths = [];
+            for (var _i = 0, includes_1 = includes; _i < includes_1.length; _i++) {
+                var include = includes_1[_i];
+                // We also need to check the relative paths by converting them to absolute and normalizing
+                // in case they escape the base path (e.g "..\somedirectory")
+                var absolute = isRootedDiskPath(include) ? include : normalizePath(combinePaths(path, include));
+                // Append the literal and canonical candidate base paths.
+                includeBasePaths.push(getIncludeBasePath(absolute));
+            }
+            // Sort the offsets array using either the literal or canonical path representations.
+            includeBasePaths.sort(ts.getStringComparer(!useCaseSensitiveFileNames));
+            var _loop_2 = function (includeBasePath) {
+                if (ts.every(basePaths, function (basePath) { return !containsPath(basePath, includeBasePath, path, !useCaseSensitiveFileNames); })) {
+                    basePaths.push(includeBasePath);
+                }
+            };
+            // Iterate over each include base path and include unique base paths that are not a
+            // subpath of an existing base path
+            for (var _a = 0, includeBasePaths_1 = includeBasePaths; _a < includeBasePaths_1.length; _a++) {
+                var includeBasePath = includeBasePaths_1[_a];
+                _loop_2(includeBasePath);
+            }
+        }
+        return basePaths;
+    }
+    function getIncludeBasePath(absolute) {
+        var wildcardOffset = ts.indexOfAnyCharCode(absolute, wildcardCharCodes);
+        if (wildcardOffset < 0) {
+            // No "*" or "?" in the path
+            return !hasExtension(absolute)
+                ? absolute
+                : removeTrailingDirectorySeparator(getDirectoryPath(absolute));
+        }
+        return absolute.substring(0, absolute.lastIndexOf(ts.directorySeparator, wildcardOffset));
+    }
+    function ensureScriptKind(fileName, scriptKind) {
+        // Using scriptKind as a condition handles both:
+        // - 'scriptKind' is unspecified and thus it is `undefined`
+        // - 'scriptKind' is set and it is `Unknown` (0)
+        // If the 'scriptKind' is 'undefined' or 'Unknown' then we attempt
+        // to get the ScriptKind from the file name. If it cannot be resolved
+        // from the file name then the default 'TS' script kind is returned.
+        return scriptKind || getScriptKindFromFileName(fileName) || 3 /* TS */;
+    }
+    ts.ensureScriptKind = ensureScriptKind;
+    function getScriptKindFromFileName(fileName) {
+        var ext = fileName.substr(fileName.lastIndexOf("."));
+        switch (ext.toLowerCase()) {
+            case ".js" /* Js */:
+                return 1 /* JS */;
+            case ".jsx" /* Jsx */:
+                return 2 /* JSX */;
+            case ".ts" /* Ts */:
+                return 3 /* TS */;
+            case ".tsx" /* Tsx */:
+                return 4 /* TSX */;
+            case ".json" /* Json */:
+                return 6 /* JSON */;
+            default:
+                return 0 /* Unknown */;
+        }
+    }
+    ts.getScriptKindFromFileName = getScriptKindFromFileName;
+    /**
+     *  List of supported extensions in order of file resolution precedence.
+     */
+    ts.supportedTypeScriptExtensions = [".ts" /* Ts */, ".tsx" /* Tsx */, ".d.ts" /* Dts */];
+    /** Must have ".d.ts" first because if ".ts" goes first, that will be detected as the extension instead of ".d.ts". */
+    ts.supportedTypescriptExtensionsForExtractExtension = [".d.ts" /* Dts */, ".ts" /* Ts */, ".tsx" /* Tsx */];
+    ts.supportedJavascriptExtensions = [".js" /* Js */, ".jsx" /* Jsx */];
+    var allSupportedExtensions = ts.supportedTypeScriptExtensions.concat(ts.supportedJavascriptExtensions);
+    function getSupportedExtensions(options, extraFileExtensions) {
+        var needJsExtensions = options && options.allowJs;
+        if (!extraFileExtensions || extraFileExtensions.length === 0) {
+            return needJsExtensions ? allSupportedExtensions : ts.supportedTypeScriptExtensions;
+        }
+        var extensions = (needJsExtensions ? allSupportedExtensions : ts.supportedTypeScriptExtensions).concat(ts.mapDefined(extraFileExtensions, function (x) { return x.scriptKind === 7 /* Deferred */ || needJsExtensions && isJavaScriptLike(x.scriptKind) ? x.extension : undefined; }));
+        return ts.deduplicate(extensions, ts.equateStringsCaseSensitive, ts.compareStringsCaseSensitive);
+    }
+    ts.getSupportedExtensions = getSupportedExtensions;
+    function isJavaScriptLike(scriptKind) {
+        return scriptKind === 1 /* JS */ || scriptKind === 2 /* JSX */;
+    }
+    function hasJavaScriptFileExtension(fileName) {
+        return ts.some(ts.supportedJavascriptExtensions, function (extension) { return ts.fileExtensionIs(fileName, extension); });
+    }
+    ts.hasJavaScriptFileExtension = hasJavaScriptFileExtension;
+    function hasTypeScriptFileExtension(fileName) {
+        return ts.some(ts.supportedTypeScriptExtensions, function (extension) { return ts.fileExtensionIs(fileName, extension); });
+    }
+    ts.hasTypeScriptFileExtension = hasTypeScriptFileExtension;
+    function isSupportedSourceFileName(fileName, compilerOptions, extraFileExtensions) {
+        if (!fileName) {
+            return false;
+        }
+        for (var _i = 0, _a = getSupportedExtensions(compilerOptions, extraFileExtensions); _i < _a.length; _i++) {
+            var extension = _a[_i];
+            if (ts.fileExtensionIs(fileName, extension)) {
+                return true;
+            }
+        }
+        return false;
+    }
+    ts.isSupportedSourceFileName = isSupportedSourceFileName;
+    /**
+     * Extension boundaries by priority. Lower numbers indicate higher priorities, and are
+     * aligned to the offset of the highest priority extension in the
+     * allSupportedExtensions array.
+     */
+    var ExtensionPriority;
+    (function (ExtensionPriority) {
+        ExtensionPriority[ExtensionPriority["TypeScriptFiles"] = 0] = "TypeScriptFiles";
+        ExtensionPriority[ExtensionPriority["DeclarationAndJavaScriptFiles"] = 2] = "DeclarationAndJavaScriptFiles";
+        ExtensionPriority[ExtensionPriority["Highest"] = 0] = "Highest";
+        ExtensionPriority[ExtensionPriority["Lowest"] = 2] = "Lowest";
+    })(ExtensionPriority = ts.ExtensionPriority || (ts.ExtensionPriority = {}));
+    function getExtensionPriority(path, supportedExtensions) {
+        for (var i = supportedExtensions.length - 1; i >= 0; i--) {
+            if (ts.fileExtensionIs(path, supportedExtensions[i])) {
+                return adjustExtensionPriority(i, supportedExtensions);
+            }
+        }
+        // If its not in the list of supported extensions, this is likely a
+        // TypeScript file with a non-ts extension
+        return 0 /* Highest */;
+    }
+    ts.getExtensionPriority = getExtensionPriority;
+    /**
+     * Adjusts an extension priority to be the highest priority within the same range.
+     */
+    function adjustExtensionPriority(extensionPriority, supportedExtensions) {
+        if (extensionPriority < 2 /* DeclarationAndJavaScriptFiles */) {
+            return 0 /* TypeScriptFiles */;
+        }
+        else if (extensionPriority < supportedExtensions.length) {
+            return 2 /* DeclarationAndJavaScriptFiles */;
+        }
+        else {
+            return supportedExtensions.length;
+        }
+    }
+    ts.adjustExtensionPriority = adjustExtensionPriority;
+    /**
+     * Gets the next lowest extension priority for a given priority.
+     */
+    function getNextLowestExtensionPriority(extensionPriority, supportedExtensions) {
+        if (extensionPriority < 2 /* DeclarationAndJavaScriptFiles */) {
+            return 2 /* DeclarationAndJavaScriptFiles */;
+        }
+        else {
+            return supportedExtensions.length;
+        }
+    }
+    ts.getNextLowestExtensionPriority = getNextLowestExtensionPriority;
+    var extensionsToRemove = [".d.ts" /* Dts */, ".ts" /* Ts */, ".js" /* Js */, ".tsx" /* Tsx */, ".jsx" /* Jsx */, ".json" /* Json */];
+    function removeFileExtension(path) {
+        for (var _i = 0, extensionsToRemove_1 = extensionsToRemove; _i < extensionsToRemove_1.length; _i++) {
+            var ext = extensionsToRemove_1[_i];
+            var extensionless = tryRemoveExtension(path, ext);
+            if (extensionless !== undefined) {
+                return extensionless;
+            }
+        }
+        return path;
+    }
+    ts.removeFileExtension = removeFileExtension;
+    function tryRemoveExtension(path, extension) {
+        return ts.fileExtensionIs(path, extension) ? removeExtension(path, extension) : undefined;
+    }
+    ts.tryRemoveExtension = tryRemoveExtension;
+    function removeExtension(path, extension) {
+        return path.substring(0, path.length - extension.length);
+    }
+    ts.removeExtension = removeExtension;
+    function changeExtension(path, newExtension) {
+        return changeAnyExtension(path, newExtension, extensionsToRemove, /*ignoreCase*/ false);
+    }
+    ts.changeExtension = changeExtension;
+    function changeAnyExtension(path, ext, extensions, ignoreCase) {
+        var pathext = extensions !== undefined && ignoreCase !== undefined ? getAnyExtensionFromPath(path, extensions, ignoreCase) : getAnyExtensionFromPath(path);
+        return pathext ? path.slice(0, path.length - pathext.length) + (ts.startsWith(ext, ".") ? ext : "." + ext) : path;
+    }
+    ts.changeAnyExtension = changeAnyExtension;
+    var Debug;
+    (function (Debug) {
+        function showSymbol(symbol) {
+            var symbolFlags = ts.SymbolFlags;
+            return "{ flags: " + (symbolFlags ? showFlags(symbol.flags, symbolFlags) : symbol.flags) + "; declarations: " + ts.map(symbol.declarations, showSyntaxKind) + " }";
+        }
+        Debug.showSymbol = showSymbol;
+        function showFlags(flags, flagsEnum) {
+            var out = [];
+            for (var pow = 0; pow <= 30; pow++) {
+                var n = 1 << pow;
+                if (flags & n) {
+                    out.push(flagsEnum[n]);
+                }
+            }
+            return out.join("|");
+        }
+        function showSyntaxKind(node) {
+            var syntaxKind = ts.SyntaxKind;
+            return syntaxKind ? syntaxKind[node.kind] : node.kind.toString();
+        }
+        Debug.showSyntaxKind = showSyntaxKind;
+    })(Debug = ts.Debug || (ts.Debug = {}));
+    function tryParsePattern(pattern) {
+        // This should be verified outside of here and a proper error thrown.
+        Debug.assert(hasZeroOrOneAsteriskCharacter(pattern));
+        var indexOfStar = pattern.indexOf("*");
+        return indexOfStar === -1 ? undefined : {
+            prefix: pattern.substr(0, indexOfStar),
+            suffix: pattern.substr(indexOfStar + 1)
+        };
+    }
+    ts.tryParsePattern = tryParsePattern;
+    function positionIsSynthesized(pos) {
+        // This is a fast way of testing the following conditions:
+        //  pos === undefined || pos === null || isNaN(pos) || pos < 0;
+        return !(pos >= 0);
+    }
+    ts.positionIsSynthesized = positionIsSynthesized;
+    /** True if an extension is one of the supported TypeScript extensions. */
+    function extensionIsTypeScript(ext) {
+        return ext === ".ts" /* Ts */ || ext === ".tsx" /* Tsx */ || ext === ".d.ts" /* Dts */;
+    }
+    ts.extensionIsTypeScript = extensionIsTypeScript;
+    function resolutionExtensionIsTypeScriptOrJson(ext) {
+        return extensionIsTypeScript(ext) || ext === ".json" /* Json */;
+    }
+    ts.resolutionExtensionIsTypeScriptOrJson = resolutionExtensionIsTypeScriptOrJson;
+    /**
+     * Gets the extension from a path.
+     * Path must have a valid extension.
+     */
+    function extensionFromPath(path) {
+        var ext = tryGetExtensionFromPath(path);
+        return ext !== undefined ? ext : Debug.fail("File " + path + " has unknown extension.");
+    }
+    ts.extensionFromPath = extensionFromPath;
+    function isAnySupportedFileExtension(path) {
+        return tryGetExtensionFromPath(path) !== undefined;
+    }
+    ts.isAnySupportedFileExtension = isAnySupportedFileExtension;
+    function tryGetExtensionFromPath(path) {
+        return ts.find(ts.supportedTypescriptExtensionsForExtractExtension, function (e) { return ts.fileExtensionIs(path, e); }) || ts.find(ts.supportedJavascriptExtensions, function (e) { return ts.fileExtensionIs(path, e); });
+    }
+    ts.tryGetExtensionFromPath = tryGetExtensionFromPath;
+    function getAnyExtensionFromPathWorker(path, extensions, stringEqualityComparer) {
+        if (typeof extensions === "string")
+            extensions = [extensions];
+        for (var _i = 0, extensions_1 = extensions; _i < extensions_1.length; _i++) {
+            var extension = extensions_1[_i];
+            if (!ts.startsWith(extension, "."))
+                extension = "." + extension;
+            if (path.length >= extension.length && path.charAt(path.length - extension.length) === ".") {
+                var pathExtension = path.slice(path.length - extension.length);
+                if (stringEqualityComparer(pathExtension, extension)) {
+                    return pathExtension;
+                }
+            }
+        }
+        return "";
+    }
+    function getAnyExtensionFromPath(path, extensions, ignoreCase) {
+        // Retrieves any string from the final "." onwards from a base file name.
+        // Unlike extensionFromPath, which throws an exception on unrecognized extensions.
+        if (extensions) {
+            return getAnyExtensionFromPathWorker(path, extensions, ignoreCase ? ts.equateStringsCaseInsensitive : ts.equateStringsCaseSensitive);
+        }
+        var baseFileName = getBaseFileName(path);
+        var extensionIndex = baseFileName.lastIndexOf(".");
+        if (extensionIndex >= 0) {
+            return baseFileName.substring(extensionIndex);
+        }
+        return "";
+    }
+    ts.getAnyExtensionFromPath = getAnyExtensionFromPath;
+    function isCheckJsEnabledForFile(sourceFile, compilerOptions) {
+        return sourceFile.checkJsDirective ? sourceFile.checkJsDirective.enabled : compilerOptions.checkJs;
+    }
+    ts.isCheckJsEnabledForFile = isCheckJsEnabledForFile;
+    ts.emptyFileSystemEntries = {
+        files: ts.emptyArray,
+        directories: ts.emptyArray
+    };
+    /**
+     * patternStrings contains both pattern strings (containing "*") and regular strings.
+     * Return an exact match if possible, or a pattern match, or undefined.
+     * (These are verified by verifyCompilerOptions to have 0 or 1 "*" characters.)
+     */
+    function matchPatternOrExact(patternStrings, candidate) {
+        var patterns = [];
+        for (var _i = 0, patternStrings_1 = patternStrings; _i < patternStrings_1.length; _i++) {
+            var patternString = patternStrings_1[_i];
+            var pattern = tryParsePattern(patternString);
+            if (pattern) {
+                patterns.push(pattern);
+            }
+            else if (patternString === candidate) {
+                // pattern was matched as is - no need to search further
+                return patternString;
+            }
+        }
+        return ts.findBestPatternMatch(patterns, function (_) { return _; }, candidate);
+    }
+    ts.matchPatternOrExact = matchPatternOrExact;
 })(ts || (ts = {}));
 var ts;
 (function (ts) {
@@ -13060,19 +14956,20 @@ var ts;
         SignatureFlags[SignatureFlags["Yield"] = 1] = "Yield";
         SignatureFlags[SignatureFlags["Await"] = 2] = "Await";
         SignatureFlags[SignatureFlags["Type"] = 4] = "Type";
-        SignatureFlags[SignatureFlags["RequireCompleteParameterList"] = 8] = "RequireCompleteParameterList";
         SignatureFlags[SignatureFlags["IgnoreMissingOpenBrace"] = 16] = "IgnoreMissingOpenBrace";
         SignatureFlags[SignatureFlags["JSDoc"] = 32] = "JSDoc";
     })(SignatureFlags || (SignatureFlags = {}));
+    // tslint:disable variable-name
     var NodeConstructor;
     var TokenConstructor;
     var IdentifierConstructor;
     var SourceFileConstructor;
+    // tslint:enable variable-name
     function createNode(kind, pos, end) {
-        if (kind === 274) {
+        if (kind === 274 /* SourceFile */) {
             return new (SourceFileConstructor || (SourceFileConstructor = ts.objectAllocator.getSourceFileConstructor()))(kind, pos, end);
         }
-        else if (kind === 71) {
+        else if (kind === 71 /* Identifier */) {
             return new (IdentifierConstructor || (IdentifierConstructor = ts.objectAllocator.getIdentifierConstructor()))(kind, pos, end);
         }
         else if (!ts.isNodeKind(kind)) {
@@ -13100,35 +14997,49 @@ var ts;
             }
         }
     }
+    /*@internal*/
     function isJSDocLikeText(text, start) {
-        return text.charCodeAt(start + 1) === 42 &&
-            text.charCodeAt(start + 2) === 42 &&
-            text.charCodeAt(start + 3) !== 47;
+        return text.charCodeAt(start + 1) === 42 /* asterisk */ &&
+            text.charCodeAt(start + 2) === 42 /* asterisk */ &&
+            text.charCodeAt(start + 3) !== 47 /* slash */;
     }
     ts.isJSDocLikeText = isJSDocLikeText;
+    /**
+     * Invokes a callback for each child of the given node. The 'cbNode' callback is invoked for all child nodes
+     * stored in properties. If a 'cbNodes' callback is specified, it is invoked for embedded arrays; otherwise,
+     * embedded arrays are flattened and the 'cbNode' callback is invoked for each element. If a callback returns
+     * a truthy value, iteration stops and that value is returned. Otherwise, undefined is returned.
+     *
+     * @param node a given node to visit its children
+     * @param cbNode a callback to be invoked for all child nodes
+     * @param cbNodes a callback to be invoked for embedded array
+     *
+     * @remarks `forEachChild` must visit the children of a node in the order
+     * that they appear in the source code. The language service depends on this property to locate nodes by position.
+     */
     function forEachChild(node, cbNode, cbNodes) {
-        if (!node || node.kind <= 145) {
+        if (!node || node.kind <= 145 /* LastToken */) {
             return;
         }
         switch (node.kind) {
-            case 146:
+            case 146 /* QualifiedName */:
                 return visitNode(cbNode, node.left) ||
                     visitNode(cbNode, node.right);
-            case 148:
+            case 148 /* TypeParameter */:
                 return visitNode(cbNode, node.name) ||
                     visitNode(cbNode, node.constraint) ||
                     visitNode(cbNode, node.default) ||
                     visitNode(cbNode, node.expression);
-            case 271:
+            case 271 /* ShorthandPropertyAssignment */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.name) ||
                     visitNode(cbNode, node.questionToken) ||
                     visitNode(cbNode, node.equalsToken) ||
                     visitNode(cbNode, node.objectAssignmentInitializer);
-            case 272:
+            case 272 /* SpreadAssignment */:
                 return visitNode(cbNode, node.expression);
-            case 149:
+            case 149 /* Parameter */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.dotDotDotToken) ||
@@ -13136,7 +15047,7 @@ var ts;
                     visitNode(cbNode, node.questionToken) ||
                     visitNode(cbNode, node.type) ||
                     visitNode(cbNode, node.initializer);
-            case 152:
+            case 152 /* PropertyDeclaration */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.name) ||
@@ -13144,51 +15055,51 @@ var ts;
                     visitNode(cbNode, node.exclamationToken) ||
                     visitNode(cbNode, node.type) ||
                     visitNode(cbNode, node.initializer);
-            case 151:
+            case 151 /* PropertySignature */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.name) ||
                     visitNode(cbNode, node.questionToken) ||
                     visitNode(cbNode, node.type) ||
                     visitNode(cbNode, node.initializer);
-            case 270:
+            case 270 /* PropertyAssignment */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.name) ||
                     visitNode(cbNode, node.questionToken) ||
                     visitNode(cbNode, node.initializer);
-            case 232:
+            case 232 /* VariableDeclaration */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.name) ||
                     visitNode(cbNode, node.exclamationToken) ||
                     visitNode(cbNode, node.type) ||
                     visitNode(cbNode, node.initializer);
-            case 182:
+            case 182 /* BindingElement */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.dotDotDotToken) ||
                     visitNode(cbNode, node.propertyName) ||
                     visitNode(cbNode, node.name) ||
                     visitNode(cbNode, node.initializer);
-            case 163:
-            case 164:
-            case 158:
-            case 159:
-            case 160:
+            case 163 /* FunctionType */:
+            case 164 /* ConstructorType */:
+            case 158 /* CallSignature */:
+            case 159 /* ConstructSignature */:
+            case 160 /* IndexSignature */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNodes(cbNode, cbNodes, node.typeParameters) ||
                     visitNodes(cbNode, cbNodes, node.parameters) ||
                     visitNode(cbNode, node.type);
-            case 154:
-            case 153:
-            case 155:
-            case 156:
-            case 157:
-            case 192:
-            case 234:
-            case 193:
+            case 154 /* MethodDeclaration */:
+            case 153 /* MethodSignature */:
+            case 155 /* Constructor */:
+            case 156 /* GetAccessor */:
+            case 157 /* SetAccessor */:
+            case 192 /* FunctionExpression */:
+            case 234 /* FunctionDeclaration */:
+            case 193 /* ArrowFunction */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.asteriskToken) ||
@@ -13199,304 +15110,304 @@ var ts;
                     visitNode(cbNode, node.type) ||
                     visitNode(cbNode, node.equalsGreaterThanToken) ||
                     visitNode(cbNode, node.body);
-            case 162:
+            case 162 /* TypeReference */:
                 return visitNode(cbNode, node.typeName) ||
                     visitNodes(cbNode, cbNodes, node.typeArguments);
-            case 161:
+            case 161 /* TypePredicate */:
                 return visitNode(cbNode, node.parameterName) ||
                     visitNode(cbNode, node.type);
-            case 165:
+            case 165 /* TypeQuery */:
                 return visitNode(cbNode, node.exprName);
-            case 166:
+            case 166 /* TypeLiteral */:
                 return visitNodes(cbNode, cbNodes, node.members);
-            case 167:
+            case 167 /* ArrayType */:
                 return visitNode(cbNode, node.elementType);
-            case 168:
+            case 168 /* TupleType */:
                 return visitNodes(cbNode, cbNodes, node.elementTypes);
-            case 169:
-            case 170:
+            case 169 /* UnionType */:
+            case 170 /* IntersectionType */:
                 return visitNodes(cbNode, cbNodes, node.types);
-            case 171:
+            case 171 /* ConditionalType */:
                 return visitNode(cbNode, node.checkType) ||
                     visitNode(cbNode, node.extendsType) ||
                     visitNode(cbNode, node.trueType) ||
                     visitNode(cbNode, node.falseType);
-            case 172:
+            case 172 /* InferType */:
                 return visitNode(cbNode, node.typeParameter);
-            case 179:
+            case 179 /* ImportType */:
                 return visitNode(cbNode, node.argument) ||
                     visitNode(cbNode, node.qualifier) ||
                     visitNodes(cbNode, cbNodes, node.typeArguments);
-            case 173:
-            case 175:
+            case 173 /* ParenthesizedType */:
+            case 175 /* TypeOperator */:
                 return visitNode(cbNode, node.type);
-            case 176:
+            case 176 /* IndexedAccessType */:
                 return visitNode(cbNode, node.objectType) ||
                     visitNode(cbNode, node.indexType);
-            case 177:
+            case 177 /* MappedType */:
                 return visitNode(cbNode, node.readonlyToken) ||
                     visitNode(cbNode, node.typeParameter) ||
                     visitNode(cbNode, node.questionToken) ||
                     visitNode(cbNode, node.type);
-            case 178:
+            case 178 /* LiteralType */:
                 return visitNode(cbNode, node.literal);
-            case 180:
-            case 181:
+            case 180 /* ObjectBindingPattern */:
+            case 181 /* ArrayBindingPattern */:
                 return visitNodes(cbNode, cbNodes, node.elements);
-            case 183:
+            case 183 /* ArrayLiteralExpression */:
                 return visitNodes(cbNode, cbNodes, node.elements);
-            case 184:
+            case 184 /* ObjectLiteralExpression */:
                 return visitNodes(cbNode, cbNodes, node.properties);
-            case 185:
+            case 185 /* PropertyAccessExpression */:
                 return visitNode(cbNode, node.expression) ||
                     visitNode(cbNode, node.name);
-            case 186:
+            case 186 /* ElementAccessExpression */:
                 return visitNode(cbNode, node.expression) ||
                     visitNode(cbNode, node.argumentExpression);
-            case 187:
-            case 188:
+            case 187 /* CallExpression */:
+            case 188 /* NewExpression */:
                 return visitNode(cbNode, node.expression) ||
                     visitNodes(cbNode, cbNodes, node.typeArguments) ||
                     visitNodes(cbNode, cbNodes, node.arguments);
-            case 189:
+            case 189 /* TaggedTemplateExpression */:
                 return visitNode(cbNode, node.tag) ||
                     visitNodes(cbNode, cbNodes, node.typeArguments) ||
                     visitNode(cbNode, node.template);
-            case 190:
+            case 190 /* TypeAssertionExpression */:
                 return visitNode(cbNode, node.type) ||
                     visitNode(cbNode, node.expression);
-            case 191:
+            case 191 /* ParenthesizedExpression */:
                 return visitNode(cbNode, node.expression);
-            case 194:
+            case 194 /* DeleteExpression */:
                 return visitNode(cbNode, node.expression);
-            case 195:
+            case 195 /* TypeOfExpression */:
                 return visitNode(cbNode, node.expression);
-            case 196:
+            case 196 /* VoidExpression */:
                 return visitNode(cbNode, node.expression);
-            case 198:
+            case 198 /* PrefixUnaryExpression */:
                 return visitNode(cbNode, node.operand);
-            case 203:
+            case 203 /* YieldExpression */:
                 return visitNode(cbNode, node.asteriskToken) ||
                     visitNode(cbNode, node.expression);
-            case 197:
+            case 197 /* AwaitExpression */:
                 return visitNode(cbNode, node.expression);
-            case 199:
+            case 199 /* PostfixUnaryExpression */:
                 return visitNode(cbNode, node.operand);
-            case 200:
+            case 200 /* BinaryExpression */:
                 return visitNode(cbNode, node.left) ||
                     visitNode(cbNode, node.operatorToken) ||
                     visitNode(cbNode, node.right);
-            case 208:
+            case 208 /* AsExpression */:
                 return visitNode(cbNode, node.expression) ||
                     visitNode(cbNode, node.type);
-            case 209:
+            case 209 /* NonNullExpression */:
                 return visitNode(cbNode, node.expression);
-            case 210:
+            case 210 /* MetaProperty */:
                 return visitNode(cbNode, node.name);
-            case 201:
+            case 201 /* ConditionalExpression */:
                 return visitNode(cbNode, node.condition) ||
                     visitNode(cbNode, node.questionToken) ||
                     visitNode(cbNode, node.whenTrue) ||
                     visitNode(cbNode, node.colonToken) ||
                     visitNode(cbNode, node.whenFalse);
-            case 204:
+            case 204 /* SpreadElement */:
                 return visitNode(cbNode, node.expression);
-            case 213:
-            case 240:
+            case 213 /* Block */:
+            case 240 /* ModuleBlock */:
                 return visitNodes(cbNode, cbNodes, node.statements);
-            case 274:
+            case 274 /* SourceFile */:
                 return visitNodes(cbNode, cbNodes, node.statements) ||
                     visitNode(cbNode, node.endOfFileToken);
-            case 214:
+            case 214 /* VariableStatement */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.declarationList);
-            case 233:
+            case 233 /* VariableDeclarationList */:
                 return visitNodes(cbNode, cbNodes, node.declarations);
-            case 216:
+            case 216 /* ExpressionStatement */:
                 return visitNode(cbNode, node.expression);
-            case 217:
+            case 217 /* IfStatement */:
                 return visitNode(cbNode, node.expression) ||
                     visitNode(cbNode, node.thenStatement) ||
                     visitNode(cbNode, node.elseStatement);
-            case 218:
+            case 218 /* DoStatement */:
                 return visitNode(cbNode, node.statement) ||
                     visitNode(cbNode, node.expression);
-            case 219:
+            case 219 /* WhileStatement */:
                 return visitNode(cbNode, node.expression) ||
                     visitNode(cbNode, node.statement);
-            case 220:
+            case 220 /* ForStatement */:
                 return visitNode(cbNode, node.initializer) ||
                     visitNode(cbNode, node.condition) ||
                     visitNode(cbNode, node.incrementor) ||
                     visitNode(cbNode, node.statement);
-            case 221:
+            case 221 /* ForInStatement */:
                 return visitNode(cbNode, node.initializer) ||
                     visitNode(cbNode, node.expression) ||
                     visitNode(cbNode, node.statement);
-            case 222:
+            case 222 /* ForOfStatement */:
                 return visitNode(cbNode, node.awaitModifier) ||
                     visitNode(cbNode, node.initializer) ||
                     visitNode(cbNode, node.expression) ||
                     visitNode(cbNode, node.statement);
-            case 223:
-            case 224:
+            case 223 /* ContinueStatement */:
+            case 224 /* BreakStatement */:
                 return visitNode(cbNode, node.label);
-            case 225:
+            case 225 /* ReturnStatement */:
                 return visitNode(cbNode, node.expression);
-            case 226:
+            case 226 /* WithStatement */:
                 return visitNode(cbNode, node.expression) ||
                     visitNode(cbNode, node.statement);
-            case 227:
+            case 227 /* SwitchStatement */:
                 return visitNode(cbNode, node.expression) ||
                     visitNode(cbNode, node.caseBlock);
-            case 241:
+            case 241 /* CaseBlock */:
                 return visitNodes(cbNode, cbNodes, node.clauses);
-            case 266:
+            case 266 /* CaseClause */:
                 return visitNode(cbNode, node.expression) ||
                     visitNodes(cbNode, cbNodes, node.statements);
-            case 267:
+            case 267 /* DefaultClause */:
                 return visitNodes(cbNode, cbNodes, node.statements);
-            case 228:
+            case 228 /* LabeledStatement */:
                 return visitNode(cbNode, node.label) ||
                     visitNode(cbNode, node.statement);
-            case 229:
+            case 229 /* ThrowStatement */:
                 return visitNode(cbNode, node.expression);
-            case 230:
+            case 230 /* TryStatement */:
                 return visitNode(cbNode, node.tryBlock) ||
                     visitNode(cbNode, node.catchClause) ||
                     visitNode(cbNode, node.finallyBlock);
-            case 269:
+            case 269 /* CatchClause */:
                 return visitNode(cbNode, node.variableDeclaration) ||
                     visitNode(cbNode, node.block);
-            case 150:
+            case 150 /* Decorator */:
                 return visitNode(cbNode, node.expression);
-            case 235:
-            case 205:
+            case 235 /* ClassDeclaration */:
+            case 205 /* ClassExpression */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.name) ||
                     visitNodes(cbNode, cbNodes, node.typeParameters) ||
                     visitNodes(cbNode, cbNodes, node.heritageClauses) ||
                     visitNodes(cbNode, cbNodes, node.members);
-            case 236:
+            case 236 /* InterfaceDeclaration */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.name) ||
                     visitNodes(cbNode, cbNodes, node.typeParameters) ||
                     visitNodes(cbNode, cbNodes, node.heritageClauses) ||
                     visitNodes(cbNode, cbNodes, node.members);
-            case 237:
+            case 237 /* TypeAliasDeclaration */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.name) ||
                     visitNodes(cbNode, cbNodes, node.typeParameters) ||
                     visitNode(cbNode, node.type);
-            case 238:
+            case 238 /* EnumDeclaration */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.name) ||
                     visitNodes(cbNode, cbNodes, node.members);
-            case 273:
+            case 273 /* EnumMember */:
                 return visitNode(cbNode, node.name) ||
                     visitNode(cbNode, node.initializer);
-            case 239:
+            case 239 /* ModuleDeclaration */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.name) ||
                     visitNode(cbNode, node.body);
-            case 243:
+            case 243 /* ImportEqualsDeclaration */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.name) ||
                     visitNode(cbNode, node.moduleReference);
-            case 244:
+            case 244 /* ImportDeclaration */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.importClause) ||
                     visitNode(cbNode, node.moduleSpecifier);
-            case 245:
+            case 245 /* ImportClause */:
                 return visitNode(cbNode, node.name) ||
                     visitNode(cbNode, node.namedBindings);
-            case 242:
+            case 242 /* NamespaceExportDeclaration */:
                 return visitNode(cbNode, node.name);
-            case 246:
+            case 246 /* NamespaceImport */:
                 return visitNode(cbNode, node.name);
-            case 247:
-            case 251:
+            case 247 /* NamedImports */:
+            case 251 /* NamedExports */:
                 return visitNodes(cbNode, cbNodes, node.elements);
-            case 250:
+            case 250 /* ExportDeclaration */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.exportClause) ||
                     visitNode(cbNode, node.moduleSpecifier);
-            case 248:
-            case 252:
+            case 248 /* ImportSpecifier */:
+            case 252 /* ExportSpecifier */:
                 return visitNode(cbNode, node.propertyName) ||
                     visitNode(cbNode, node.name);
-            case 249:
+            case 249 /* ExportAssignment */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.expression);
-            case 202:
+            case 202 /* TemplateExpression */:
                 return visitNode(cbNode, node.head) || visitNodes(cbNode, cbNodes, node.templateSpans);
-            case 211:
+            case 211 /* TemplateSpan */:
                 return visitNode(cbNode, node.expression) || visitNode(cbNode, node.literal);
-            case 147:
+            case 147 /* ComputedPropertyName */:
                 return visitNode(cbNode, node.expression);
-            case 268:
+            case 268 /* HeritageClause */:
                 return visitNodes(cbNode, cbNodes, node.types);
-            case 207:
+            case 207 /* ExpressionWithTypeArguments */:
                 return visitNode(cbNode, node.expression) ||
                     visitNodes(cbNode, cbNodes, node.typeArguments);
-            case 254:
+            case 254 /* ExternalModuleReference */:
                 return visitNode(cbNode, node.expression);
-            case 253:
+            case 253 /* MissingDeclaration */:
                 return visitNodes(cbNode, cbNodes, node.decorators);
-            case 302:
+            case 302 /* CommaListExpression */:
                 return visitNodes(cbNode, cbNodes, node.elements);
-            case 255:
+            case 255 /* JsxElement */:
                 return visitNode(cbNode, node.openingElement) ||
                     visitNodes(cbNode, cbNodes, node.children) ||
                     visitNode(cbNode, node.closingElement);
-            case 259:
+            case 259 /* JsxFragment */:
                 return visitNode(cbNode, node.openingFragment) ||
                     visitNodes(cbNode, cbNodes, node.children) ||
                     visitNode(cbNode, node.closingFragment);
-            case 256:
-            case 257:
+            case 256 /* JsxSelfClosingElement */:
+            case 257 /* JsxOpeningElement */:
                 return visitNode(cbNode, node.tagName) ||
                     visitNodes(cbNode, cbNodes, node.typeArguments) ||
                     visitNode(cbNode, node.attributes);
-            case 263:
+            case 263 /* JsxAttributes */:
                 return visitNodes(cbNode, cbNodes, node.properties);
-            case 262:
+            case 262 /* JsxAttribute */:
                 return visitNode(cbNode, node.name) ||
                     visitNode(cbNode, node.initializer);
-            case 264:
+            case 264 /* JsxSpreadAttribute */:
                 return visitNode(cbNode, node.expression);
-            case 265:
+            case 265 /* JsxExpression */:
                 return visitNode(cbNode, node.dotDotDotToken) ||
                     visitNode(cbNode, node.expression);
-            case 258:
+            case 258 /* JsxClosingElement */:
                 return visitNode(cbNode, node.tagName);
-            case 278:
+            case 278 /* JSDocTypeExpression */:
                 return visitNode(cbNode, node.type);
-            case 282:
+            case 282 /* JSDocNonNullableType */:
                 return visitNode(cbNode, node.type);
-            case 281:
+            case 281 /* JSDocNullableType */:
                 return visitNode(cbNode, node.type);
-            case 283:
+            case 283 /* JSDocOptionalType */:
                 return visitNode(cbNode, node.type);
-            case 284:
+            case 284 /* JSDocFunctionType */:
                 return visitNodes(cbNode, cbNodes, node.parameters) ||
                     visitNode(cbNode, node.type);
-            case 285:
+            case 285 /* JSDocVariadicType */:
                 return visitNode(cbNode, node.type);
-            case 286:
+            case 286 /* JSDocComment */:
                 return visitNodes(cbNode, cbNodes, node.tags);
-            case 293:
-            case 298:
+            case 293 /* JSDocParameterTag */:
+            case 298 /* JSDocPropertyTag */:
                 if (node.isNameFirst) {
                     return visitNode(cbNode, node.name) ||
                         visitNode(cbNode, node.typeExpression);
@@ -13505,17 +15416,17 @@ var ts;
                     return visitNode(cbNode, node.typeExpression) ||
                         visitNode(cbNode, node.name);
                 }
-            case 294:
+            case 294 /* JSDocReturnTag */:
                 return visitNode(cbNode, node.typeExpression);
-            case 295:
+            case 295 /* JSDocTypeTag */:
                 return visitNode(cbNode, node.typeExpression);
-            case 290:
+            case 290 /* JSDocAugmentsTag */:
                 return visitNode(cbNode, node.class);
-            case 296:
+            case 296 /* JSDocTemplateTag */:
                 return visitNodes(cbNode, cbNodes, node.typeParameters);
-            case 297:
+            case 297 /* JSDocTypedefTag */:
                 if (node.typeExpression &&
-                    node.typeExpression.kind === 278) {
+                    node.typeExpression.kind === 278 /* JSDocTypeExpression */) {
                     return visitNode(cbNode, node.typeExpression) ||
                         visitNode(cbNode, node.fullName);
                 }
@@ -13523,16 +15434,16 @@ var ts;
                     return visitNode(cbNode, node.fullName) ||
                         visitNode(cbNode, node.typeExpression);
                 }
-            case 292:
+            case 292 /* JSDocCallbackTag */:
                 return visitNode(cbNode, node.fullName) ||
                     visitNode(cbNode, node.typeExpression);
-            case 288:
+            case 288 /* JSDocSignature */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNodes(cbNode, cbNodes, node.typeParameters) ||
                     visitNodes(cbNode, cbNodes, node.parameters) ||
                     visitNode(cbNode, node.type);
-            case 287:
+            case 287 /* JSDocTypeLiteral */:
                 if (node.jsDocPropertyTags) {
                     for (var _i = 0, _a = node.jsDocPropertyTags; _i < _a.length; _i++) {
                         var tag = _a[_i];
@@ -13540,7 +15451,7 @@ var ts;
                     }
                 }
                 return;
-            case 301:
+            case 301 /* PartiallyEmittedExpression */:
                 return visitNode(cbNode, node.expression);
         }
     }
@@ -13549,11 +15460,11 @@ var ts;
         if (setParentNodes === void 0) { setParentNodes = false; }
         ts.performance.mark("beforeParse");
         var result;
-        if (languageVersion === 100) {
-            result = Parser.parseJsonText(fileName, sourceText, languageVersion, undefined, setParentNodes);
+        if (languageVersion === 100 /* JSON */) {
+            result = Parser.parseJsonText(fileName, sourceText, languageVersion, /*syntaxCursor*/ undefined, setParentNodes);
         }
         else {
-            result = Parser.parseSourceFile(fileName, sourceText, languageVersion, undefined, setParentNodes, scriptKind);
+            result = Parser.parseSourceFile(fileName, sourceText, languageVersion, /*syntaxCursor*/ undefined, setParentNodes, scriptKind);
         }
         ts.performance.mark("afterParse");
         ts.performance.measure("Parse", "beforeParse", "afterParse");
@@ -13564,41 +15475,71 @@ var ts;
         return Parser.parseIsolatedEntityName(text, languageVersion);
     }
     ts.parseIsolatedEntityName = parseIsolatedEntityName;
+    /**
+     * Parse json text into SyntaxTree and return node and parse errors if any
+     * @param fileName
+     * @param sourceText
+     */
     function parseJsonText(fileName, sourceText) {
         return Parser.parseJsonText(fileName, sourceText);
     }
     ts.parseJsonText = parseJsonText;
+    // See also `isExternalOrCommonJsModule` in utilities.ts
     function isExternalModule(file) {
         return file.externalModuleIndicator !== undefined;
     }
     ts.isExternalModule = isExternalModule;
+    // Produces a new SourceFile for the 'newText' provided. The 'textChangeRange' parameter
+    // indicates what changed between the 'text' that this SourceFile has and the 'newText'.
+    // The SourceFile will be created with the compiler attempting to reuse as many nodes from
+    // this file as possible.
+    //
+    // Note: this function mutates nodes from this SourceFile. That means any existing nodes
+    // from this SourceFile that are being held onto may change as a result (including
+    // becoming detached from any SourceFile).  It is recommended that this SourceFile not
+    // be used once 'update' is called on it.
     function updateSourceFile(sourceFile, newText, textChangeRange, aggressiveChecks) {
         if (aggressiveChecks === void 0) { aggressiveChecks = false; }
         var newSourceFile = IncrementalParser.updateSourceFile(sourceFile, newText, textChangeRange, aggressiveChecks);
-        newSourceFile.flags |= (sourceFile.flags & 1572864);
+        // Because new source file node is created, it may not have the flag PossiblyContainDynamicImport. This is the case if there is no new edit to add dynamic import.
+        // We will manually port the flag to the new source file.
+        newSourceFile.flags |= (sourceFile.flags & 1572864 /* PermanentlySetIncrementalFlags */);
         return newSourceFile;
     }
     ts.updateSourceFile = updateSourceFile;
+    /* @internal */
     function parseIsolatedJSDocComment(content, start, length) {
         var result = Parser.JSDocParser.parseIsolatedJSDocComment(content, start, length);
         if (result && result.jsDoc) {
+            // because the jsDocComment was parsed out of the source file, it might
+            // not be covered by the fixupParentReferences.
             Parser.fixupParentReferences(result.jsDoc);
         }
         return result;
     }
     ts.parseIsolatedJSDocComment = parseIsolatedJSDocComment;
+    /* @internal */
+    // Exposed only for testing.
     function parseJSDocTypeExpressionForTests(content, start, length) {
         return Parser.JSDocParser.parseJSDocTypeExpressionForTests(content, start, length);
     }
     ts.parseJSDocTypeExpressionForTests = parseJSDocTypeExpressionForTests;
+    // Implement the parser as a singleton module.  We do this for perf reasons because creating
+    // parser instances can actually be expensive enough to impact us on projects with many source
+    // files.
     var Parser;
     (function (Parser) {
-        var scanner = ts.createScanner(6, true);
-        var disallowInAndDecoratorContext = 2048 | 8192;
+        // Share a single scanner across all calls to parse a source file.  This helps speed things
+        // up by avoiding the cost of creating/compiling scanners over and over again.
+        var scanner = ts.createScanner(6 /* Latest */, /*skipTrivia*/ true);
+        var disallowInAndDecoratorContext = 2048 /* DisallowInContext */ | 8192 /* DecoratorContext */;
+        // capture constructors in 'initializeState' to avoid null checks
+        // tslint:disable variable-name
         var NodeConstructor;
         var TokenConstructor;
         var IdentifierConstructor;
         var SourceFileConstructor;
+        // tslint:enable variable-name
         var sourceFile;
         var parseDiagnostics;
         var syntaxCursor;
@@ -13608,14 +15549,87 @@ var ts;
         var identifiers;
         var identifierCount;
         var parsingContext;
+        // Flags that dictate what parsing context we're in.  For example:
+        // Whether or not we are in strict parsing mode.  All that changes in strict parsing mode is
+        // that some tokens that would be considered identifiers may be considered keywords.
+        //
+        // When adding more parser context flags, consider which is the more common case that the
+        // flag will be in.  This should be the 'false' state for that flag.  The reason for this is
+        // that we don't store data in our nodes unless the value is in the *non-default* state.  So,
+        // for example, more often than code 'allows-in' (or doesn't 'disallow-in').  We opt for
+        // 'disallow-in' set to 'false'.  Otherwise, if we had 'allowsIn' set to 'true', then almost
+        // all nodes would need extra state on them to store this info.
+        //
+        // Note: 'allowIn' and 'allowYield' track 1:1 with the [in] and [yield] concepts in the ES6
+        // grammar specification.
+        //
+        // An important thing about these context concepts.  By default they are effectively inherited
+        // while parsing through every grammar production.  i.e. if you don't change them, then when
+        // you parse a sub-production, it will have the same context values as the parent production.
+        // This is great most of the time.  After all, consider all the 'expression' grammar productions
+        // and how nearly all of them pass along the 'in' and 'yield' context values:
+        //
+        // EqualityExpression[In, Yield] :
+        //      RelationalExpression[?In, ?Yield]
+        //      EqualityExpression[?In, ?Yield] == RelationalExpression[?In, ?Yield]
+        //      EqualityExpression[?In, ?Yield] != RelationalExpression[?In, ?Yield]
+        //      EqualityExpression[?In, ?Yield] === RelationalExpression[?In, ?Yield]
+        //      EqualityExpression[?In, ?Yield] !== RelationalExpression[?In, ?Yield]
+        //
+        // Where you have to be careful is then understanding what the points are in the grammar
+        // where the values are *not* passed along.  For example:
+        //
+        // SingleNameBinding[Yield,GeneratorParameter]
+        //      [+GeneratorParameter]BindingIdentifier[Yield] Initializer[In]opt
+        //      [~GeneratorParameter]BindingIdentifier[?Yield]Initializer[In, ?Yield]opt
+        //
+        // Here this is saying that if the GeneratorParameter context flag is set, that we should
+        // explicitly set the 'yield' context flag to false before calling into the BindingIdentifier
+        // and we should explicitly unset the 'yield' context flag before calling into the Initializer.
+        // production.  Conversely, if the GeneratorParameter context flag is not set, then we
+        // should leave the 'yield' context flag alone.
+        //
+        // Getting this all correct is tricky and requires careful reading of the grammar to
+        // understand when these values should be changed versus when they should be inherited.
+        //
+        // Note: it should not be necessary to save/restore these flags during speculative/lookahead
+        // parsing.  These context flags are naturally stored and restored through normal recursive
+        // descent parsing and unwinding.
         var contextFlags;
+        // Whether or not we've had a parse error since creating the last AST node.  If we have
+        // encountered an error, it will be stored on the next AST node we create.  Parse errors
+        // can be broken down into three categories:
+        //
+        // 1) An error that occurred during scanning.  For example, an unterminated literal, or a
+        //    character that was completely not understood.
+        //
+        // 2) A token was expected, but was not present.  This type of error is commonly produced
+        //    by the 'parseExpected' function.
+        //
+        // 3) A token was present that no parsing function was able to consume.  This type of error
+        //    only occurs in the 'abortParsingListOrMoveToNextToken' function when the parser
+        //    decides to skip the token.
+        //
+        // In all of these cases, we want to mark the next node as having had an error before it.
+        // With this mark, we can know in incremental settings if this node can be reused, or if
+        // we have to reparse it.  If we don't keep this information around, we may just reuse the
+        // node.  in that event we would then not produce the same errors as we did before, causing
+        // significant confusion problems.
+        //
+        // Note: it is necessary that this value be saved/restored during speculative/lookahead
+        // parsing.  During lookahead parsing, we will often create a node.  That node will have
+        // this value attached, and then this value will be set back to 'false'.  If we decide to
+        // rewind, we must get back to the same value we had prior to the lookahead.
+        //
+        // Note: any errors at the end of the file that do not precede a regular node, should get
+        // attached to the EOF token.
         var parseErrorBeforeNextFinishedNode = false;
         function parseSourceFile(fileName, sourceText, languageVersion, syntaxCursor, setParentNodes, scriptKind) {
             if (setParentNodes === void 0) { setParentNodes = false; }
             scriptKind = ts.ensureScriptKind(fileName, scriptKind);
-            if (scriptKind === 6) {
+            if (scriptKind === 6 /* JSON */) {
                 var result_1 = parseJsonText(fileName, sourceText, languageVersion, syntaxCursor, setParentNodes);
-                ts.convertToObjectWorker(result_1, result_1.parseDiagnostics, false, undefined, undefined);
+                ts.convertToObjectWorker(result_1, result_1.parseDiagnostics, /*returnValue*/ false, /*knownRootOptions*/ undefined, /*jsonConversionNotifier*/ undefined);
                 result_1.typeReferenceDirectives = ts.emptyArray;
                 result_1.amdDependencies = ts.emptyArray;
                 return result_1;
@@ -13627,57 +15641,62 @@ var ts;
         }
         Parser.parseSourceFile = parseSourceFile;
         function parseIsolatedEntityName(content, languageVersion) {
-            initializeState(content, languageVersion, undefined, 1);
+            // Choice of `isDeclarationFile` should be arbitrary
+            initializeState(content, languageVersion, /*syntaxCursor*/ undefined, 1 /* JS */);
+            // Prime the scanner.
             nextToken();
-            var entityName = parseEntityName(true);
-            var isInvalid = token() === 1 && !parseDiagnostics.length;
+            var entityName = parseEntityName(/*allowReservedWords*/ true);
+            var isInvalid = token() === 1 /* EndOfFileToken */ && !parseDiagnostics.length;
             clearState();
             return isInvalid ? entityName : undefined;
         }
         Parser.parseIsolatedEntityName = parseIsolatedEntityName;
         function parseJsonText(fileName, sourceText, languageVersion, syntaxCursor, setParentNodes) {
-            if (languageVersion === void 0) { languageVersion = 2; }
-            initializeState(sourceText, languageVersion, syntaxCursor, 6);
-            sourceFile = createSourceFile(fileName, 2, 6, false);
+            if (languageVersion === void 0) { languageVersion = 2 /* ES2015 */; }
+            initializeState(sourceText, languageVersion, syntaxCursor, 6 /* JSON */);
+            // Set source file so that errors will be reported with this file name
+            sourceFile = createSourceFile(fileName, 2 /* ES2015 */, 6 /* JSON */, /*isDeclaration*/ false);
             sourceFile.flags = contextFlags;
+            // Prime the scanner.
             nextToken();
             var pos = getNodePos();
-            if (token() === 1) {
+            if (token() === 1 /* EndOfFileToken */) {
                 sourceFile.statements = createNodeArray([], pos, pos);
                 sourceFile.endOfFileToken = parseTokenNode();
             }
             else {
-                var statement = createNode(216);
+                var statement = createNode(216 /* ExpressionStatement */);
                 switch (token()) {
-                    case 21:
+                    case 21 /* OpenBracketToken */:
                         statement.expression = parseArrayLiteralExpression();
                         break;
-                    case 101:
-                    case 86:
-                    case 95:
+                    case 101 /* TrueKeyword */:
+                    case 86 /* FalseKeyword */:
+                    case 95 /* NullKeyword */:
                         statement.expression = parseTokenNode();
                         break;
-                    case 38:
-                        if (lookAhead(function () { return nextToken() === 8 && nextToken() !== 56; })) {
+                    case 38 /* MinusToken */:
+                        if (lookAhead(function () { return nextToken() === 8 /* NumericLiteral */ && nextToken() !== 56 /* ColonToken */; })) {
                             statement.expression = parsePrefixUnaryExpression();
                         }
                         else {
                             statement.expression = parseObjectLiteralExpression();
                         }
                         break;
-                    case 8:
-                    case 9:
-                        if (lookAhead(function () { return nextToken() !== 56; })) {
+                    case 8 /* NumericLiteral */:
+                    case 9 /* StringLiteral */:
+                        if (lookAhead(function () { return nextToken() !== 56 /* ColonToken */; })) {
                             statement.expression = parseLiteralNode();
                             break;
                         }
+                    // falls through
                     default:
                         statement.expression = parseObjectLiteralExpression();
                         break;
                 }
                 finishNode(statement);
                 sourceFile.statements = createNodeArray([statement], pos);
-                sourceFile.endOfFileToken = parseExpectedToken(1, ts.Diagnostics.Unexpected_token);
+                sourceFile.endOfFileToken = parseExpectedToken(1 /* EndOfFileToken */, ts.Diagnostics.Unexpected_token);
             }
             if (setParentNodes) {
                 fixupParentReferences(sourceFile);
@@ -13689,7 +15708,8 @@ var ts;
         }
         Parser.parseJsonText = parseJsonText;
         function getLanguageVariant(scriptKind) {
-            return scriptKind === 4 || scriptKind === 2 || scriptKind === 1 || scriptKind === 6 ? 1 : 0;
+            // .tsx and .jsx files are treated as jsx language variant.
+            return scriptKind === 4 /* TSX */ || scriptKind === 2 /* JSX */ || scriptKind === 1 /* JS */ || scriptKind === 6 /* JSON */ ? 1 /* JSX */ : 0 /* Standard */;
         }
         function initializeState(_sourceText, languageVersion, _syntaxCursor, scriptKind) {
             NodeConstructor = ts.objectAllocator.getNodeConstructor();
@@ -13704,26 +15724,29 @@ var ts;
             identifierCount = 0;
             nodeCount = 0;
             switch (scriptKind) {
-                case 1:
-                case 2:
-                    contextFlags = 65536;
+                case 1 /* JS */:
+                case 2 /* JSX */:
+                    contextFlags = 65536 /* JavaScriptFile */;
                     break;
-                case 6:
-                    contextFlags = 65536 | 16777216;
+                case 6 /* JSON */:
+                    contextFlags = 65536 /* JavaScriptFile */ | 16777216 /* JsonFile */;
                     break;
                 default:
-                    contextFlags = 0;
+                    contextFlags = 0 /* None */;
                     break;
             }
             parseErrorBeforeNextFinishedNode = false;
+            // Initialize and prime the scanner before parsing the source elements.
             scanner.setText(sourceText);
             scanner.setOnError(scanError);
             scanner.setScriptTarget(languageVersion);
             scanner.setLanguageVariant(getLanguageVariant(scriptKind));
         }
         function clearState() {
+            // Clear out the text the scanner is pointing at, so it doesn't keep anything alive unnecessarily.
             scanner.setText("");
             scanner.setOnError(undefined);
+            // Clear any data.  We don't want to accidentally hold onto it for too long.
             parseDiagnostics = undefined;
             sourceFile = undefined;
             identifiers = undefined;
@@ -13733,15 +15756,17 @@ var ts;
         function parseSourceFileWorker(fileName, languageVersion, setParentNodes, scriptKind) {
             var isDeclarationFile = isDeclarationFileName(fileName);
             if (isDeclarationFile) {
-                contextFlags |= 4194304;
+                contextFlags |= 4194304 /* Ambient */;
             }
             sourceFile = createSourceFile(fileName, languageVersion, scriptKind, isDeclarationFile);
             sourceFile.flags = contextFlags;
+            // Prime the scanner.
             nextToken();
+            // A member of ReadonlyArray<T> isn't assignable to a member of T[] (and prevents a direct cast) - but this is where we set up those members so they can be readonly in the future
             processCommentPragmas(sourceFile, sourceText);
             processPragmasIntoFields(sourceFile, reportPragmaDiagnostic);
-            sourceFile.statements = parseList(0, parseStatement);
-            ts.Debug.assert(token() === 1);
+            sourceFile.statements = parseList(0 /* SourceElements */, parseStatement);
+            ts.Debug.assert(token() === 1 /* EndOfFileToken */);
             sourceFile.endOfFileToken = addJSDocComment(parseTokenNode());
             setExternalModuleIndicator(sourceFile);
             sourceFile.nodeCount = nodeCount;
@@ -13767,10 +15792,17 @@ var ts;
             return node;
         }
         function fixupParentReferences(rootNode) {
+            // normally parent references are set during binding. However, for clients that only need
+            // a syntax tree, and no semantic features, then the binding process is an unnecessary
+            // overhead.  This functions allows us to set all the parents, without all the expense of
+            // binding.
             var parent = rootNode;
             forEachChild(rootNode, visitNode);
             return;
             function visitNode(n) {
+                // walk down setting parents that differ from the parent we think it should be.  This
+                // allows us to quickly bail out of setting parents for subtrees during incremental
+                // parsing
                 if (n.parent !== parent) {
                     n.parent = parent;
                     var saveParent = parent;
@@ -13790,7 +15822,9 @@ var ts;
         }
         Parser.fixupParentReferences = fixupParentReferences;
         function createSourceFile(fileName, languageVersion, scriptKind, isDeclarationFile) {
-            var sourceFile = new SourceFileConstructor(274, 0, sourceText.length);
+            // code from createNode is inlined here so createNode won't have to deal with special case of creating source files
+            // this is quite rare comparing to other nodes and createNode should be as fast as possible
+            var sourceFile = new SourceFileConstructor(274 /* SourceFile */, /*pos*/ 0, /* end */ sourceText.length);
             nodeCount++;
             sourceFile.text = sourceText;
             sourceFile.bindDiagnostics = [];
@@ -13811,81 +15845,102 @@ var ts;
             }
         }
         function setDisallowInContext(val) {
-            setContextFlag(val, 2048);
+            setContextFlag(val, 2048 /* DisallowInContext */);
         }
         function setYieldContext(val) {
-            setContextFlag(val, 4096);
+            setContextFlag(val, 4096 /* YieldContext */);
         }
         function setDecoratorContext(val) {
-            setContextFlag(val, 8192);
+            setContextFlag(val, 8192 /* DecoratorContext */);
         }
         function setAwaitContext(val) {
-            setContextFlag(val, 16384);
+            setContextFlag(val, 16384 /* AwaitContext */);
         }
         function doOutsideOfContext(context, func) {
+            // contextFlagsToClear will contain only the context flags that are
+            // currently set that we need to temporarily clear
+            // We don't just blindly reset to the previous flags to ensure
+            // that we do not mutate cached flags for the incremental
+            // parser (ThisNodeHasError, ThisNodeOrAnySubNodesHasError, and
+            // HasAggregatedChildData).
             var contextFlagsToClear = context & contextFlags;
             if (contextFlagsToClear) {
-                setContextFlag(false, contextFlagsToClear);
+                // clear the requested context flags
+                setContextFlag(/*val*/ false, contextFlagsToClear);
                 var result = func();
-                setContextFlag(true, contextFlagsToClear);
+                // restore the context flags we just cleared
+                setContextFlag(/*val*/ true, contextFlagsToClear);
                 return result;
             }
+            // no need to do anything special as we are not in any of the requested contexts
             return func();
         }
         function doInsideOfContext(context, func) {
+            // contextFlagsToSet will contain only the context flags that
+            // are not currently set that we need to temporarily enable.
+            // We don't just blindly reset to the previous flags to ensure
+            // that we do not mutate cached flags for the incremental
+            // parser (ThisNodeHasError, ThisNodeOrAnySubNodesHasError, and
+            // HasAggregatedChildData).
             var contextFlagsToSet = context & ~contextFlags;
             if (contextFlagsToSet) {
-                setContextFlag(true, contextFlagsToSet);
+                // set the requested context flags
+                setContextFlag(/*val*/ true, contextFlagsToSet);
                 var result = func();
-                setContextFlag(false, contextFlagsToSet);
+                // reset the context flags we just set
+                setContextFlag(/*val*/ false, contextFlagsToSet);
                 return result;
             }
+            // no need to do anything special as we are already in all of the requested contexts
             return func();
         }
         function allowInAnd(func) {
-            return doOutsideOfContext(2048, func);
+            return doOutsideOfContext(2048 /* DisallowInContext */, func);
         }
         function disallowInAnd(func) {
-            return doInsideOfContext(2048, func);
+            return doInsideOfContext(2048 /* DisallowInContext */, func);
         }
         function doInYieldContext(func) {
-            return doInsideOfContext(4096, func);
+            return doInsideOfContext(4096 /* YieldContext */, func);
         }
         function doInDecoratorContext(func) {
-            return doInsideOfContext(8192, func);
+            return doInsideOfContext(8192 /* DecoratorContext */, func);
         }
         function doInAwaitContext(func) {
-            return doInsideOfContext(16384, func);
+            return doInsideOfContext(16384 /* AwaitContext */, func);
         }
         function doOutsideOfAwaitContext(func) {
-            return doOutsideOfContext(16384, func);
+            return doOutsideOfContext(16384 /* AwaitContext */, func);
         }
         function doInYieldAndAwaitContext(func) {
-            return doInsideOfContext(4096 | 16384, func);
+            return doInsideOfContext(4096 /* YieldContext */ | 16384 /* AwaitContext */, func);
         }
         function inContext(flags) {
             return (contextFlags & flags) !== 0;
         }
         function inYieldContext() {
-            return inContext(4096);
+            return inContext(4096 /* YieldContext */);
         }
         function inDisallowInContext() {
-            return inContext(2048);
+            return inContext(2048 /* DisallowInContext */);
         }
         function inDecoratorContext() {
-            return inContext(8192);
+            return inContext(8192 /* DecoratorContext */);
         }
         function inAwaitContext() {
-            return inContext(16384);
+            return inContext(16384 /* AwaitContext */);
         }
         function parseErrorAtCurrentToken(message, arg0) {
             parseErrorAt(scanner.getTokenPos(), scanner.getTextPos(), message, arg0);
         }
         function parseErrorAtPosition(start, length, message, arg0) {
+            // Don't report another error if it would just be at the same position as the last error.
             var lastError = ts.lastOrUndefined(parseDiagnostics);
             if (!lastError || start !== lastError.start) {
                 parseDiagnostics.push(ts.createFileDiagnostic(sourceFile, start, length, message, arg0));
             }
+            // Mark that we've encountered an error.  We'll set an appropriate bit on the next
+            // node we finish so that it can't be reused incrementally.
             parseErrorBeforeNextFinishedNode = true;
         }
         function parseErrorAt(start, end, message, arg0) {
@@ -13900,6 +15955,12 @@ var ts;
         function getNodePos() {
             return scanner.getStartPos();
         }
+        // Use this function to access the current token instead of reading the currentToken
+        // variable. Since function results aren't narrowed in control flow analysis, this ensures
+        // that the type checker doesn't make wrong assumptions about the type of the current
+        // token (e.g. a call to nextToken() changes the current token but the checker doesn't
+        // reason about this side effect).  Mainstream VMs inline simple functions like this, so
+        // there is no performance penalty.
         function token() {
             return currentToken;
         }
@@ -13925,14 +15986,25 @@ var ts;
             return currentToken = scanner.scanJsxAttributeValue();
         }
         function speculationHelper(callback, isLookAhead) {
+            // Keep track of the state we'll need to rollback to if lookahead fails (or if the
+            // caller asked us to always reset our state).
             var saveToken = currentToken;
             var saveParseDiagnosticsLength = parseDiagnostics.length;
             var saveParseErrorBeforeNextFinishedNode = parseErrorBeforeNextFinishedNode;
+            // Note: it is not actually necessary to save/restore the context flags here.  That's
+            // because the saving/restoring of these flags happens naturally through the recursive
+            // descent nature of our parser.  However, we still store this here just so we can
+            // assert that invariant holds.
             var saveContextFlags = contextFlags;
+            // If we're only looking ahead, then tell the scanner to only lookahead as well.
+            // Otherwise, if we're actually speculatively parsing, then tell the scanner to do the
+            // same.
             var result = isLookAhead
                 ? scanner.lookAhead(callback)
                 : scanner.tryScan(callback);
             ts.Debug.assert(saveContextFlags === contextFlags);
+            // If our callback returned something 'falsy' or we're just looking ahead,
+            // then unconditionally restore us to where we were.
             if (!result || isLookAhead) {
                 currentToken = saveToken;
                 parseDiagnostics.length = saveParseDiagnosticsLength;
@@ -13940,23 +16012,37 @@ var ts;
             }
             return result;
         }
+        /** Invokes the provided callback then unconditionally restores the parser to the state it
+         * was in immediately prior to invoking the callback.  The result of invoking the callback
+         * is returned from this function.
+         */
         function lookAhead(callback) {
-            return speculationHelper(callback, true);
+            return speculationHelper(callback, /*isLookAhead*/ true);
         }
+        /** Invokes the provided callback.  If the callback returns something falsy, then it restores
+         * the parser to the state it was in immediately prior to invoking the callback.  If the
+         * callback returns something truthy, then the parser state is not rolled back.  The result
+         * of invoking the callback is returned from this function.
+         */
         function tryParse(callback) {
-            return speculationHelper(callback, false);
+            return speculationHelper(callback, /*isLookAhead*/ false);
         }
+        // Ignore strict mode flag because we will report an error in type checker instead.
         function isIdentifier() {
-            if (token() === 71) {
+            if (token() === 71 /* Identifier */) {
                 return true;
             }
-            if (token() === 116 && inYieldContext()) {
+            // If we have a 'yield' keyword, and we're in the [yield] context, then 'yield' is
+            // considered a keyword and is not an identifier.
+            if (token() === 116 /* YieldKeyword */ && inYieldContext()) {
                 return false;
             }
-            if (token() === 121 && inAwaitContext()) {
+            // If we have a 'await' keyword, and we're in the [Await] context, then 'await' is
+            // considered a keyword and is not an identifier.
+            if (token() === 121 /* AwaitKeyword */ && inAwaitContext()) {
                 return false;
             }
-            return token() > 107;
+            return token() > 107 /* LastReservedWord */;
         }
         function parseExpected(kind, diagnosticMessage, shouldAdvance) {
             if (shouldAdvance === void 0) { shouldAdvance = true; }
@@ -13966,6 +16052,7 @@ var ts;
                 }
                 return true;
             }
+            // Report specific message if provided with one.  Otherwise, report generic fallback message.
             if (diagnosticMessage) {
                 parseErrorAtCurrentToken(diagnosticMessage);
             }
@@ -13989,7 +16076,7 @@ var ts;
         }
         function parseExpectedToken(t, diagnosticMessage, arg0) {
             return parseOptionalToken(t) ||
-                createMissingNode(t, false, diagnosticMessage || ts.Diagnostics._0_expected, arg0 || ts.tokenToString(t));
+                createMissingNode(t, /*reportAtCurrentPosition*/ false, diagnosticMessage || ts.Diagnostics._0_expected, arg0 || ts.tokenToString(t));
         }
         function parseTokenNode() {
             var node = createNode(token());
@@ -13997,37 +16084,43 @@ var ts;
             return finishNode(node);
         }
         function canParseSemicolon() {
-            if (token() === 25) {
+            // If there's a real semicolon, then we can always parse it out.
+            if (token() === 25 /* SemicolonToken */) {
                 return true;
             }
-            return token() === 18 || token() === 1 || scanner.hasPrecedingLineBreak();
+            // We can parse out an optional semicolon in ASI cases in the following cases.
+            return token() === 18 /* CloseBraceToken */ || token() === 1 /* EndOfFileToken */ || scanner.hasPrecedingLineBreak();
         }
         function parseSemicolon() {
             if (canParseSemicolon()) {
-                if (token() === 25) {
+                if (token() === 25 /* SemicolonToken */) {
+                    // consume the semicolon if it was explicitly provided.
                     nextToken();
                 }
                 return true;
             }
             else {
-                return parseExpected(25);
+                return parseExpected(25 /* SemicolonToken */);
             }
         }
         function createNode(kind, pos) {
             nodeCount++;
             var p = pos >= 0 ? pos : scanner.getStartPos();
-            return ts.isNodeKind(kind) || kind === 0 ? new NodeConstructor(kind, p, p) :
-                kind === 71 ? new IdentifierConstructor(kind, p, p) :
+            return ts.isNodeKind(kind) || kind === 0 /* Unknown */ ? new NodeConstructor(kind, p, p) :
+                kind === 71 /* Identifier */ ? new IdentifierConstructor(kind, p, p) :
                     new TokenConstructor(kind, p, p);
         }
-        function createNodeWithJSDoc(kind) {
-            var node = createNode(kind);
-            if (scanner.getTokenFlags() & 2) {
+        function createNodeWithJSDoc(kind, pos) {
+            var node = createNode(kind, pos);
+            if (scanner.getTokenFlags() & 2 /* PrecedingJSDocComment */) {
                 addJSDocComment(node);
             }
             return node;
         }
         function createNodeArray(elements, pos, end) {
+            // Since the element list of a node array is typically created by starting with an empty array and
+            // repeatedly calling push(), the list may not have the optimal memory layout. We invoke slice() for
+            // small arrays (1 to 4 elements) to give the VM a chance to allocate an optimal representation.
             var length = elements.length;
             var array = (length >= 1 && length <= 4 ? elements.slice() : elements);
             array.pos = pos;
@@ -14039,9 +16132,12 @@ var ts;
             if (contextFlags) {
                 node.flags |= contextFlags;
             }
+            // Keep track on the node if we encountered an error while parsing it.  If we did, then
+            // we cannot reuse the node incrementally.  Once we've marked this node, clear out the
+            // flag so that we don't mark any subsequent nodes.
             if (parseErrorBeforeNextFinishedNode) {
                 parseErrorBeforeNextFinishedNode = false;
-                node.flags |= 32768;
+                node.flags |= 32768 /* ThisNodeHasError */;
             }
             return node;
         }
@@ -14053,7 +16149,7 @@ var ts;
                 parseErrorAtCurrentToken(diagnosticMessage, arg0);
             }
             var result = createNode(kind);
-            if (kind === 71) {
+            if (kind === 71 /* Identifier */) {
                 result.escapedText = "";
             }
             else if (ts.isLiteralKind(kind) || ts.isTemplateLiteralKind(kind)) {
@@ -14068,19 +16164,24 @@ var ts;
             }
             return identifier;
         }
+        // An identifier that starts with two underscores has an extra underscore character prepended to it to avoid issues
+        // with magic property names like '__proto__'. The 'identifiers' object is used to share a single string instance for
+        // each identifier in order to reduce memory consumption.
         function createIdentifier(isIdentifier, diagnosticMessage) {
             identifierCount++;
             if (isIdentifier) {
-                var node = createNode(71);
-                if (token() !== 71) {
+                var node = createNode(71 /* Identifier */);
+                // Store original token kind if it is not just an Identifier so we can report appropriate error later in type checker
+                if (token() !== 71 /* Identifier */) {
                     node.originalKeywordKind = token();
                 }
                 node.escapedText = ts.escapeLeadingUnderscores(internIdentifier(scanner.getTokenValue()));
                 nextToken();
                 return finishNode(node);
             }
-            var reportAtCurrentPosition = token() === 1;
-            return createMissingNode(71, reportAtCurrentPosition, diagnosticMessage || ts.Diagnostics.Identifier_expected);
+            // Only for end of file because the error gets reported incorrectly on embedded script tags.
+            var reportAtCurrentPosition = token() === 1 /* EndOfFileToken */;
+            return createMissingNode(71 /* Identifier */, reportAtCurrentPosition, diagnosticMessage || ts.Diagnostics.Identifier_expected);
         }
         function parseIdentifier(diagnosticMessage) {
             return createIdentifier(isIdentifier(), diagnosticMessage);
@@ -14090,28 +16191,34 @@ var ts;
         }
         function isLiteralPropertyName() {
             return ts.tokenIsIdentifierOrKeyword(token()) ||
-                token() === 9 ||
-                token() === 8;
+                token() === 9 /* StringLiteral */ ||
+                token() === 8 /* NumericLiteral */;
         }
         function parsePropertyNameWorker(allowComputedPropertyNames) {
-            if (token() === 9 || token() === 8) {
+            if (token() === 9 /* StringLiteral */ || token() === 8 /* NumericLiteral */) {
                 var node = parseLiteralNode();
                 node.text = internIdentifier(node.text);
                 return node;
             }
-            if (allowComputedPropertyNames && token() === 21) {
+            if (allowComputedPropertyNames && token() === 21 /* OpenBracketToken */) {
                 return parseComputedPropertyName();
             }
             return parseIdentifierName();
         }
         function parsePropertyName() {
-            return parsePropertyNameWorker(true);
+            return parsePropertyNameWorker(/*allowComputedPropertyNames*/ true);
         }
         function parseComputedPropertyName() {
-            var node = createNode(147);
-            parseExpected(21);
+            // PropertyName [Yield]:
+            //      LiteralPropertyName
+            //      ComputedPropertyName[?Yield]
+            var node = createNode(147 /* ComputedPropertyName */);
+            parseExpected(21 /* OpenBracketToken */);
+            // We parse any expression (including a comma expression). But the grammar
+            // says that only an assignment expression is allowed, so the grammar checker
+            // will error if it sees a comma expression.
             node.expression = allowInAnd(parseExpression);
-            parseExpected(22);
+            parseExpected(22 /* CloseBracketToken */);
             return finishNode(node);
         }
         function parseContextualModifier(t) {
@@ -14126,19 +16233,20 @@ var ts;
         }
         function nextTokenCanFollowModifier() {
             switch (token()) {
-                case 76:
-                    return nextToken() === 83;
-                case 84:
+                case 76 /* ConstKeyword */:
+                    // 'const' is only a modifier if followed by 'enum'.
+                    return nextToken() === 83 /* EnumKeyword */;
+                case 84 /* ExportKeyword */:
                     nextToken();
-                    if (token() === 79) {
+                    if (token() === 79 /* DefaultKeyword */) {
                         return lookAhead(nextTokenCanFollowDefaultKeyword);
                     }
-                    return token() !== 39 && token() !== 118 && token() !== 17 && canFollowModifier();
-                case 79:
+                    return token() !== 39 /* AsteriskToken */ && token() !== 118 /* AsKeyword */ && token() !== 17 /* OpenBraceToken */ && canFollowModifier();
+                case 79 /* DefaultKeyword */:
                     return nextTokenCanFollowDefaultKeyword();
-                case 115:
-                case 125:
-                case 136:
+                case 115 /* StaticKeyword */:
+                case 125 /* GetKeyword */:
+                case 136 /* SetKeyword */:
                     nextToken();
                     return canFollowModifier();
                 default:
@@ -14149,86 +16257,112 @@ var ts;
             return ts.isModifierKind(token()) && tryParse(nextTokenCanFollowModifier);
         }
         function canFollowModifier() {
-            return token() === 21
-                || token() === 17
-                || token() === 39
-                || token() === 24
+            return token() === 21 /* OpenBracketToken */
+                || token() === 17 /* OpenBraceToken */
+                || token() === 39 /* AsteriskToken */
+                || token() === 24 /* DotDotDotToken */
                 || isLiteralPropertyName();
         }
         function nextTokenCanFollowDefaultKeyword() {
             nextToken();
-            return token() === 75 || token() === 89 ||
-                token() === 109 ||
-                (token() === 117 && lookAhead(nextTokenIsClassKeywordOnSameLine)) ||
-                (token() === 120 && lookAhead(nextTokenIsFunctionKeywordOnSameLine));
+            return token() === 75 /* ClassKeyword */ || token() === 89 /* FunctionKeyword */ ||
+                token() === 109 /* InterfaceKeyword */ ||
+                (token() === 117 /* AbstractKeyword */ && lookAhead(nextTokenIsClassKeywordOnSameLine)) ||
+                (token() === 120 /* AsyncKeyword */ && lookAhead(nextTokenIsFunctionKeywordOnSameLine));
         }
+        // True if positioned at the start of a list element
         function isListElement(parsingContext, inErrorRecovery) {
             var node = currentNode(parsingContext);
             if (node) {
                 return true;
             }
             switch (parsingContext) {
-                case 0:
-                case 1:
-                case 3:
-                    return !(token() === 25 && inErrorRecovery) && isStartOfStatement();
-                case 2:
-                    return token() === 73 || token() === 79;
-                case 4:
+                case 0 /* SourceElements */:
+                case 1 /* BlockStatements */:
+                case 3 /* SwitchClauseStatements */:
+                    // If we're in error recovery, then we don't want to treat ';' as an empty statement.
+                    // The problem is that ';' can show up in far too many contexts, and if we see one
+                    // and assume it's a statement, then we may bail out inappropriately from whatever
+                    // we're parsing.  For example, if we have a semicolon in the middle of a class, then
+                    // we really don't want to assume the class is over and we're on a statement in the
+                    // outer module.  We just want to consume and move on.
+                    return !(token() === 25 /* SemicolonToken */ && inErrorRecovery) && isStartOfStatement();
+                case 2 /* SwitchClauses */:
+                    return token() === 73 /* CaseKeyword */ || token() === 79 /* DefaultKeyword */;
+                case 4 /* TypeMembers */:
                     return lookAhead(isTypeMemberStart);
-                case 5:
-                    return lookAhead(isClassMemberStart) || (token() === 25 && !inErrorRecovery);
-                case 6:
-                    return token() === 21 || isLiteralPropertyName();
-                case 12:
-                    return token() === 21 || token() === 39 || token() === 24 || isLiteralPropertyName();
-                case 17:
+                case 5 /* ClassMembers */:
+                    // We allow semicolons as class elements (as specified by ES6) as long as we're
+                    // not in error recovery.  If we're in error recovery, we don't want an errant
+                    // semicolon to be treated as a class member (since they're almost always used
+                    // for statements.
+                    return lookAhead(isClassMemberStart) || (token() === 25 /* SemicolonToken */ && !inErrorRecovery);
+                case 6 /* EnumMembers */:
+                    // Include open bracket computed properties. This technically also lets in indexers,
+                    // which would be a candidate for improved error reporting.
+                    return token() === 21 /* OpenBracketToken */ || isLiteralPropertyName();
+                case 12 /* ObjectLiteralMembers */:
+                    return token() === 21 /* OpenBracketToken */ || token() === 39 /* AsteriskToken */ || token() === 24 /* DotDotDotToken */ || isLiteralPropertyName();
+                case 17 /* RestProperties */:
                     return isLiteralPropertyName();
-                case 9:
-                    return token() === 21 || token() === 24 || isLiteralPropertyName();
-                case 7:
-                    if (token() === 17) {
+                case 9 /* ObjectBindingElements */:
+                    return token() === 21 /* OpenBracketToken */ || token() === 24 /* DotDotDotToken */ || isLiteralPropertyName();
+                case 7 /* HeritageClauseElement */:
+                    // If we see `{ ... }` then only consume it as an expression if it is followed by `,` or `{`
+                    // That way we won't consume the body of a class in its heritage clause.
+                    if (token() === 17 /* OpenBraceToken */) {
                         return lookAhead(isValidHeritageClauseObjectLiteral);
                     }
                     if (!inErrorRecovery) {
                         return isStartOfLeftHandSideExpression() && !isHeritageClauseExtendsOrImplementsKeyword();
                     }
                     else {
+                        // If we're in error recovery we tighten up what we're willing to match.
+                        // That way we don't treat something like "this" as a valid heritage clause
+                        // element during recovery.
                         return isIdentifier() && !isHeritageClauseExtendsOrImplementsKeyword();
                     }
-                case 8:
+                case 8 /* VariableDeclarations */:
                     return isIdentifierOrPattern();
-                case 10:
-                    return token() === 26 || token() === 24 || isIdentifierOrPattern();
-                case 18:
+                case 10 /* ArrayBindingElements */:
+                    return token() === 26 /* CommaToken */ || token() === 24 /* DotDotDotToken */ || isIdentifierOrPattern();
+                case 18 /* TypeParameters */:
                     return isIdentifier();
-                case 15:
-                    if (token() === 26) {
+                case 15 /* ArrayLiteralMembers */:
+                    if (token() === 26 /* CommaToken */) {
                         return true;
                     }
-                case 11:
-                    return token() === 24 || isStartOfExpression();
-                case 16:
+                // falls through
+                case 11 /* ArgumentExpressions */:
+                    return token() === 24 /* DotDotDotToken */ || isStartOfExpression();
+                case 16 /* Parameters */:
                     return isStartOfParameter();
-                case 19:
-                case 20:
-                    return token() === 26 || isStartOfType();
-                case 21:
+                case 19 /* TypeArguments */:
+                case 20 /* TupleElementTypes */:
+                    return token() === 26 /* CommaToken */ || isStartOfType();
+                case 21 /* HeritageClauses */:
                     return isHeritageClause();
-                case 22:
+                case 22 /* ImportOrExportSpecifiers */:
                     return ts.tokenIsIdentifierOrKeyword(token());
-                case 13:
-                    return ts.tokenIsIdentifierOrKeyword(token()) || token() === 17;
-                case 14:
+                case 13 /* JsxAttributes */:
+                    return ts.tokenIsIdentifierOrKeyword(token()) || token() === 17 /* OpenBraceToken */;
+                case 14 /* JsxChildren */:
                     return true;
             }
             return ts.Debug.fail("Non-exhaustive case in 'isListElement'.");
         }
         function isValidHeritageClauseObjectLiteral() {
-            ts.Debug.assert(token() === 17);
-            if (nextToken() === 18) {
+            ts.Debug.assert(token() === 17 /* OpenBraceToken */);
+            if (nextToken() === 18 /* CloseBraceToken */) {
+                // if we see "extends {}" then only treat the {} as what we're extending (and not
+                // the class body) if we have:
+                //
+                //      extends {} {
+                //      extends {},
+                //      extends {} extends
+                //      extends {} implements
                 var next = nextToken();
-                return next === 26 || next === 17 || next === 85 || next === 108;
+                return next === 26 /* CommaToken */ || next === 17 /* OpenBraceToken */ || next === 85 /* ExtendsKeyword */ || next === 108 /* ImplementsKeyword */;
             }
             return true;
         }
@@ -14245,8 +16379,8 @@ var ts;
             return ts.tokenIsIdentifierOrKeywordOrGreaterThan(token());
         }
         function isHeritageClauseExtendsOrImplementsKeyword() {
-            if (token() === 108 ||
-                token() === 85) {
+            if (token() === 108 /* ImplementsKeyword */ ||
+                token() === 85 /* ExtendsKeyword */) {
                 return lookAhead(nextTokenIsStartOfExpression);
             }
             return false;
@@ -14259,78 +16393,95 @@ var ts;
             nextToken();
             return isStartOfType();
         }
+        // True if positioned at a list terminator
         function isListTerminator(kind) {
-            if (token() === 1) {
+            if (token() === 1 /* EndOfFileToken */) {
+                // Being at the end of the file ends all lists.
                 return true;
             }
             switch (kind) {
-                case 1:
-                case 2:
-                case 4:
-                case 5:
-                case 6:
-                case 12:
-                case 9:
-                case 22:
-                    return token() === 18;
-                case 3:
-                    return token() === 18 || token() === 73 || token() === 79;
-                case 7:
-                    return token() === 17 || token() === 85 || token() === 108;
-                case 8:
+                case 1 /* BlockStatements */:
+                case 2 /* SwitchClauses */:
+                case 4 /* TypeMembers */:
+                case 5 /* ClassMembers */:
+                case 6 /* EnumMembers */:
+                case 12 /* ObjectLiteralMembers */:
+                case 9 /* ObjectBindingElements */:
+                case 22 /* ImportOrExportSpecifiers */:
+                    return token() === 18 /* CloseBraceToken */;
+                case 3 /* SwitchClauseStatements */:
+                    return token() === 18 /* CloseBraceToken */ || token() === 73 /* CaseKeyword */ || token() === 79 /* DefaultKeyword */;
+                case 7 /* HeritageClauseElement */:
+                    return token() === 17 /* OpenBraceToken */ || token() === 85 /* ExtendsKeyword */ || token() === 108 /* ImplementsKeyword */;
+                case 8 /* VariableDeclarations */:
                     return isVariableDeclaratorListTerminator();
-                case 18:
-                    return token() === 29 || token() === 19 || token() === 17 || token() === 85 || token() === 108;
-                case 11:
-                    return token() === 20 || token() === 25;
-                case 15:
-                case 20:
-                case 10:
-                    return token() === 22;
-                case 16:
-                case 17:
-                    return token() === 20 || token() === 22;
-                case 19:
-                    return token() !== 26;
-                case 21:
-                    return token() === 17 || token() === 18;
-                case 13:
-                    return token() === 29 || token() === 41;
-                case 14:
-                    return token() === 27 && lookAhead(nextTokenIsSlash);
+                case 18 /* TypeParameters */:
+                    // Tokens other than '>' are here for better error recovery
+                    return token() === 29 /* GreaterThanToken */ || token() === 19 /* OpenParenToken */ || token() === 17 /* OpenBraceToken */ || token() === 85 /* ExtendsKeyword */ || token() === 108 /* ImplementsKeyword */;
+                case 11 /* ArgumentExpressions */:
+                    // Tokens other than ')' are here for better error recovery
+                    return token() === 20 /* CloseParenToken */ || token() === 25 /* SemicolonToken */;
+                case 15 /* ArrayLiteralMembers */:
+                case 20 /* TupleElementTypes */:
+                case 10 /* ArrayBindingElements */:
+                    return token() === 22 /* CloseBracketToken */;
+                case 16 /* Parameters */:
+                case 17 /* RestProperties */:
+                    // Tokens other than ')' and ']' (the latter for index signatures) are here for better error recovery
+                    return token() === 20 /* CloseParenToken */ || token() === 22 /* CloseBracketToken */ /*|| token === SyntaxKind.OpenBraceToken*/;
+                case 19 /* TypeArguments */:
+                    // All other tokens should cause the type-argument to terminate except comma token
+                    return token() !== 26 /* CommaToken */;
+                case 21 /* HeritageClauses */:
+                    return token() === 17 /* OpenBraceToken */ || token() === 18 /* CloseBraceToken */;
+                case 13 /* JsxAttributes */:
+                    return token() === 29 /* GreaterThanToken */ || token() === 41 /* SlashToken */;
+                case 14 /* JsxChildren */:
+                    return token() === 27 /* LessThanToken */ && lookAhead(nextTokenIsSlash);
                 default:
                     return false;
             }
         }
         function isVariableDeclaratorListTerminator() {
+            // If we can consume a semicolon (either explicitly, or with ASI), then consider us done
+            // with parsing the list of variable declarators.
             if (canParseSemicolon()) {
                 return true;
             }
+            // in the case where we're parsing the variable declarator of a 'for-in' statement, we
+            // are done if we see an 'in' keyword in front of us. Same with for-of
             if (isInOrOfKeyword(token())) {
                 return true;
             }
-            if (token() === 36) {
+            // ERROR RECOVERY TWEAK:
+            // For better error recovery, if we see an '=>' then we just stop immediately.  We've got an
+            // arrow function here and it's going to be very unlikely that we'll resynchronize and get
+            // another variable declaration.
+            if (token() === 36 /* EqualsGreaterThanToken */) {
                 return true;
             }
+            // Keep trying to parse out variable declarators.
             return false;
         }
+        // True if positioned at element or terminator of the current list or any enclosing list
         function isInSomeParsingContext() {
-            for (var kind = 0; kind < 23; kind++) {
+            for (var kind = 0; kind < 23 /* Count */; kind++) {
                 if (parsingContext & (1 << kind)) {
-                    if (isListElement(kind, true) || isListTerminator(kind)) {
+                    if (isListElement(kind, /*inErrorRecovery*/ true) || isListTerminator(kind)) {
                         return true;
                     }
                 }
             }
             return false;
         }
+        // Parses a list of elements
         function parseList(kind, parseElement) {
             var saveParsingContext = parsingContext;
             parsingContext |= 1 << kind;
             var list = [];
             var listPos = getNodePos();
             while (!isListTerminator(kind)) {
-                if (isListElement(kind, false)) {
+                if (isListElement(kind, /*inErrorRecovery*/ false)) {
                     var element = parseListElement(kind, parseElement);
                     list.push(element);
                     continue;
@@ -14350,85 +16501,145 @@ var ts;
             return parseElement();
         }
         function currentNode(parsingContext) {
+            // If there is an outstanding parse error that we've encountered, but not attached to
+            // some node, then we cannot get a node from the old source tree.  This is because we
+            // want to mark the next node we encounter as being unusable.
+            //
+            // Note: This may be too conservative.  Perhaps we could reuse the node and set the bit
+            // on it (or its leftmost child) as having the error.  For now though, being conservative
+            // is nice and likely won't ever affect perf.
             if (parseErrorBeforeNextFinishedNode) {
                 return undefined;
             }
             if (!syntaxCursor) {
+                // if we don't have a cursor, we could never return a node from the old tree.
                 return undefined;
             }
             var node = syntaxCursor.currentNode(scanner.getStartPos());
+            // Can't reuse a missing node.
             if (ts.nodeIsMissing(node)) {
                 return undefined;
             }
+            // Can't reuse a node that intersected the change range.
             if (node.intersectsChange) {
                 return undefined;
             }
+            // Can't reuse a node that contains a parse error.  This is necessary so that we
+            // produce the same set of errors again.
             if (ts.containsParseError(node)) {
                 return undefined;
             }
-            var nodeContextFlags = node.flags & 12679168;
+            // We can only reuse a node if it was parsed under the same strict mode that we're
+            // currently in.  i.e. if we originally parsed a node in non-strict mode, but then
+            // the user added 'using strict' at the top of the file, then we can't use that node
+            // again as the presence of strict mode may cause us to parse the tokens in the file
+            // differently.
+            //
+            // Note: we *can* reuse tokens when the strict mode changes.  That's because tokens
+            // are unaffected by strict mode.  It's just the parser will decide what to do with it
+            // differently depending on what mode it is in.
+            //
+            // This also applies to all our other context flags as well.
+            var nodeContextFlags = node.flags & 12679168 /* ContextFlags */;
             if (nodeContextFlags !== contextFlags) {
                 return undefined;
             }
+            // Ok, we have a node that looks like it could be reused.  Now verify that it is valid
+            // in the current list parsing context that we're currently at.
             if (!canReuseNode(node, parsingContext)) {
                 return undefined;
             }
             if (node.jsDocCache) {
+                // jsDocCache may include tags from parent nodes, which might have been modified.
                 node.jsDocCache = undefined;
             }
             return node;
         }
         function consumeNode(node) {
+            // Move the scanner so it is after the node we just consumed.
             scanner.setTextPos(node.end);
             nextToken();
             return node;
         }
         function canReuseNode(node, parsingContext) {
             switch (parsingContext) {
-                case 5:
+                case 5 /* ClassMembers */:
                     return isReusableClassMember(node);
-                case 2:
+                case 2 /* SwitchClauses */:
                     return isReusableSwitchClause(node);
-                case 0:
-                case 1:
-                case 3:
+                case 0 /* SourceElements */:
+                case 1 /* BlockStatements */:
+                case 3 /* SwitchClauseStatements */:
                     return isReusableStatement(node);
-                case 6:
+                case 6 /* EnumMembers */:
                     return isReusableEnumMember(node);
-                case 4:
+                case 4 /* TypeMembers */:
                     return isReusableTypeMember(node);
-                case 8:
+                case 8 /* VariableDeclarations */:
                     return isReusableVariableDeclaration(node);
-                case 16:
+                case 16 /* Parameters */:
                     return isReusableParameter(node);
-                case 17:
+                case 17 /* RestProperties */:
                     return false;
-                case 21:
-                case 18:
-                case 20:
-                case 19:
-                case 11:
-                case 12:
-                case 7:
-                case 13:
-                case 14:
+                // Any other lists we do not care about reusing nodes in.  But feel free to add if
+                // you can do so safely.  Danger areas involve nodes that may involve speculative
+                // parsing.  If speculative parsing is involved with the node, then the range the
+                // parser reached while looking ahead might be in the edited range (see the example
+                // in canReuseVariableDeclaratorNode for a good case of this).
+                case 21 /* HeritageClauses */:
+                // This would probably be safe to reuse.  There is no speculative parsing with
+                // heritage clauses.
+                case 18 /* TypeParameters */:
+                // This would probably be safe to reuse.  There is no speculative parsing with
+                // type parameters.  Note that that's because type *parameters* only occur in
+                // unambiguous *type* contexts.  While type *arguments* occur in very ambiguous
+                // *expression* contexts.
+                case 20 /* TupleElementTypes */:
+                // This would probably be safe to reuse.  There is no speculative parsing with
+                // tuple types.
+                // Technically, type argument list types are probably safe to reuse.  While
+                // speculative parsing is involved with them (since type argument lists are only
+                // produced from speculative parsing a < as a type argument list), we only have
+                // the types because speculative parsing succeeded.  Thus, the lookahead never
+                // went past the end of the list and rewound.
+                case 19 /* TypeArguments */:
+                // Note: these are almost certainly not safe to ever reuse.  Expressions commonly
+                // need a large amount of lookahead, and we should not reuse them as they may
+                // have actually intersected the edit.
+                case 11 /* ArgumentExpressions */:
+                // This is not safe to reuse for the same reason as the 'AssignmentExpression'
+                // cases.  i.e. a property assignment may end with an expression, and thus might
+                // have lookahead far beyond it's old node.
+                case 12 /* ObjectLiteralMembers */:
+                // This is probably not safe to reuse.  There can be speculative parsing with
+                // type names in a heritage clause.  There can be generic names in the type
+                // name list, and there can be left hand side expressions (which can have type
+                // arguments.)
+                case 7 /* HeritageClauseElement */:
+                // Perhaps safe to reuse, but it's unlikely we'd see more than a dozen attributes
+                // on any given element. Same for children.
+                case 13 /* JsxAttributes */:
+                case 14 /* JsxChildren */:
             }
             return false;
         }
         function isReusableClassMember(node) {
             if (node) {
                 switch (node.kind) {
-                    case 155:
-                    case 160:
-                    case 156:
-                    case 157:
-                    case 152:
-                    case 212:
+                    case 155 /* Constructor */:
+                    case 160 /* IndexSignature */:
+                    case 156 /* GetAccessor */:
+                    case 157 /* SetAccessor */:
+                    case 152 /* PropertyDeclaration */:
+                    case 212 /* SemicolonClassElement */:
                         return true;
-                    case 154:
+                    case 154 /* MethodDeclaration */:
+                        // Method declarations are not necessarily reusable.  An object-literal
+                        // may have a method calls "constructor(...)" and we must reparse that
+                        // into an actual .ConstructorDeclaration.
                         var methodDeclaration = node;
-                        var nameIsConstructor = methodDeclaration.name.kind === 71 &&
-                            methodDeclaration.name.originalKeywordKind === 123;
+                        var nameIsConstructor = methodDeclaration.name.kind === 71 /* Identifier */ &&
+                            methodDeclaration.name.originalKeywordKind === 123 /* ConstructorKeyword */;
                         return !nameIsConstructor;
                 }
             }
@@ -14437,8 +16648,8 @@ var ts;
         function isReusableSwitchClause(node) {
             if (node) {
                 switch (node.kind) {
-                    case 266:
-                    case 267:
+                    case 266 /* CaseClause */:
+                    case 267 /* DefaultClause */:
                         return true;
                 }
             }
@@ -14447,70 +16658,86 @@ var ts;
         function isReusableStatement(node) {
             if (node) {
                 switch (node.kind) {
-                    case 234:
-                    case 214:
-                    case 213:
-                    case 217:
-                    case 216:
-                    case 229:
-                    case 225:
-                    case 227:
-                    case 224:
-                    case 223:
-                    case 221:
-                    case 222:
-                    case 220:
-                    case 219:
-                    case 226:
-                    case 215:
-                    case 230:
-                    case 228:
-                    case 218:
-                    case 231:
-                    case 244:
-                    case 243:
-                    case 250:
-                    case 249:
-                    case 239:
-                    case 235:
-                    case 236:
-                    case 238:
-                    case 237:
+                    case 234 /* FunctionDeclaration */:
+                    case 214 /* VariableStatement */:
+                    case 213 /* Block */:
+                    case 217 /* IfStatement */:
+                    case 216 /* ExpressionStatement */:
+                    case 229 /* ThrowStatement */:
+                    case 225 /* ReturnStatement */:
+                    case 227 /* SwitchStatement */:
+                    case 224 /* BreakStatement */:
+                    case 223 /* ContinueStatement */:
+                    case 221 /* ForInStatement */:
+                    case 222 /* ForOfStatement */:
+                    case 220 /* ForStatement */:
+                    case 219 /* WhileStatement */:
+                    case 226 /* WithStatement */:
+                    case 215 /* EmptyStatement */:
+                    case 230 /* TryStatement */:
+                    case 228 /* LabeledStatement */:
+                    case 218 /* DoStatement */:
+                    case 231 /* DebuggerStatement */:
+                    case 244 /* ImportDeclaration */:
+                    case 243 /* ImportEqualsDeclaration */:
+                    case 250 /* ExportDeclaration */:
+                    case 249 /* ExportAssignment */:
+                    case 239 /* ModuleDeclaration */:
+                    case 235 /* ClassDeclaration */:
+                    case 236 /* InterfaceDeclaration */:
+                    case 238 /* EnumDeclaration */:
+                    case 237 /* TypeAliasDeclaration */:
                         return true;
                 }
             }
             return false;
         }
         function isReusableEnumMember(node) {
-            return node.kind === 273;
+            return node.kind === 273 /* EnumMember */;
         }
         function isReusableTypeMember(node) {
             if (node) {
                 switch (node.kind) {
-                    case 159:
-                    case 153:
-                    case 160:
-                    case 151:
-                    case 158:
+                    case 159 /* ConstructSignature */:
+                    case 153 /* MethodSignature */:
+                    case 160 /* IndexSignature */:
+                    case 151 /* PropertySignature */:
+                    case 158 /* CallSignature */:
                         return true;
                 }
             }
             return false;
         }
         function isReusableVariableDeclaration(node) {
-            if (node.kind !== 232) {
+            if (node.kind !== 232 /* VariableDeclaration */) {
                 return false;
             }
+            // Very subtle incremental parsing bug.  Consider the following code:
+            //
+            //      let v = new List < A, B
+            //
+            // This is actually legal code.  It's a list of variable declarators "v = new List<A"
+            // on one side and "B" on the other. If you then change that to:
+            //
+            //      let v = new List < A, B >()
+            //
+            // then we have a problem.  "v = new List<A" doesn't intersect the change range, so we
+            // start reparsing at "B" and we completely fail to handle this properly.
+            //
+            // In order to prevent this, we do not allow a variable declarator to be reused if it
+            // has an initializer.
             var variableDeclarator = node;
             return variableDeclarator.initializer === undefined;
         }
         function isReusableParameter(node) {
-            if (node.kind !== 149) {
+            if (node.kind !== 149 /* Parameter */) {
                 return false;
             }
+            // See the comment in isReusableVariableDeclaration for why we do this.
             var parameter = node;
             return parameter.initializer === undefined;
         }
+        // Returns true if we should abort parsing.
         function abortParsingListOrMoveToNextToken(kind) {
             parseErrorAtCurrentToken(parsingContextErrors(kind));
             if (isInSomeParsingContext()) {
@@ -14521,55 +16748,68 @@ var ts;
         }
         function parsingContextErrors(context) {
             switch (context) {
-                case 0: return ts.Diagnostics.Declaration_or_statement_expected;
-                case 1: return ts.Diagnostics.Declaration_or_statement_expected;
-                case 2: return ts.Diagnostics.case_or_default_expected;
-                case 3: return ts.Diagnostics.Statement_expected;
-                case 17:
-                case 4: return ts.Diagnostics.Property_or_signature_expected;
-                case 5: return ts.Diagnostics.Unexpected_token_A_constructor_method_accessor_or_property_was_expected;
-                case 6: return ts.Diagnostics.Enum_member_expected;
-                case 7: return ts.Diagnostics.Expression_expected;
-                case 8: return ts.Diagnostics.Variable_declaration_expected;
-                case 9: return ts.Diagnostics.Property_destructuring_pattern_expected;
-                case 10: return ts.Diagnostics.Array_element_destructuring_pattern_expected;
-                case 11: return ts.Diagnostics.Argument_expression_expected;
-                case 12: return ts.Diagnostics.Property_assignment_expected;
-                case 15: return ts.Diagnostics.Expression_or_comma_expected;
-                case 16: return ts.Diagnostics.Parameter_declaration_expected;
-                case 18: return ts.Diagnostics.Type_parameter_declaration_expected;
-                case 19: return ts.Diagnostics.Type_argument_expected;
-                case 20: return ts.Diagnostics.Type_expected;
-                case 21: return ts.Diagnostics.Unexpected_token_expected;
-                case 22: return ts.Diagnostics.Identifier_expected;
-                case 13: return ts.Diagnostics.Identifier_expected;
-                case 14: return ts.Diagnostics.Identifier_expected;
-                default: return undefined;
+                case 0 /* SourceElements */: return ts.Diagnostics.Declaration_or_statement_expected;
+                case 1 /* BlockStatements */: return ts.Diagnostics.Declaration_or_statement_expected;
+                case 2 /* SwitchClauses */: return ts.Diagnostics.case_or_default_expected;
+                case 3 /* SwitchClauseStatements */: return ts.Diagnostics.Statement_expected;
+                case 17 /* RestProperties */: // fallthrough
+                case 4 /* TypeMembers */: return ts.Diagnostics.Property_or_signature_expected;
+                case 5 /* ClassMembers */: return ts.Diagnostics.Unexpected_token_A_constructor_method_accessor_or_property_was_expected;
+                case 6 /* EnumMembers */: return ts.Diagnostics.Enum_member_expected;
+                case 7 /* HeritageClauseElement */: return ts.Diagnostics.Expression_expected;
+                case 8 /* VariableDeclarations */: return ts.Diagnostics.Variable_declaration_expected;
+                case 9 /* ObjectBindingElements */: return ts.Diagnostics.Property_destructuring_pattern_expected;
+                case 10 /* ArrayBindingElements */: return ts.Diagnostics.Array_element_destructuring_pattern_expected;
+                case 11 /* ArgumentExpressions */: return ts.Diagnostics.Argument_expression_expected;
+                case 12 /* ObjectLiteralMembers */: return ts.Diagnostics.Property_assignment_expected;
+                case 15 /* ArrayLiteralMembers */: return ts.Diagnostics.Expression_or_comma_expected;
+                case 16 /* Parameters */: return ts.Diagnostics.Parameter_declaration_expected;
+                case 18 /* TypeParameters */: return ts.Diagnostics.Type_parameter_declaration_expected;
+                case 19 /* TypeArguments */: return ts.Diagnostics.Type_argument_expected;
+                case 20 /* TupleElementTypes */: return ts.Diagnostics.Type_expected;
+                case 21 /* HeritageClauses */: return ts.Diagnostics.Unexpected_token_expected;
+                case 22 /* ImportOrExportSpecifiers */: return ts.Diagnostics.Identifier_expected;
+                case 13 /* JsxAttributes */: return ts.Diagnostics.Identifier_expected;
+                case 14 /* JsxChildren */: return ts.Diagnostics.Identifier_expected;
+                default: return undefined; // TODO: GH#18217 `default: Debug.assertNever(context);`
             }
         }
+        // Parses a comma-delimited list of elements
         function parseDelimitedList(kind, parseElement, considerSemicolonAsDelimiter) {
             var saveParsingContext = parsingContext;
             parsingContext |= 1 << kind;
             var list = [];
             var listPos = getNodePos();
-            var commaStart = -1;
+            var commaStart = -1; // Meaning the previous token was not a comma
             while (true) {
-                if (isListElement(kind, false)) {
+                if (isListElement(kind, /*inErrorRecovery*/ false)) {
                     var startPos = scanner.getStartPos();
                     list.push(parseListElement(kind, parseElement));
                     commaStart = scanner.getTokenPos();
-                    if (parseOptional(26)) {
+                    if (parseOptional(26 /* CommaToken */)) {
+                        // No need to check for a zero length node since we know we parsed a comma
                         continue;
                     }
-                    commaStart = -1;
+                    commaStart = -1; // Back to the state where the last token was not a comma
                     if (isListTerminator(kind)) {
                         break;
                     }
-                    parseExpected(26);
-                    if (considerSemicolonAsDelimiter && token() === 25 && !scanner.hasPrecedingLineBreak()) {
+                    // We didn't get a comma, and the list wasn't terminated, explicitly parse
+                    // out a comma so we give a good error message.
+                    parseExpected(26 /* CommaToken */);
+                    // If the token was a semicolon, and the caller allows that, then skip it and
+                    // continue.  This ensures we get back on track and don't result in tons of
+                    // parse errors.  For example, this can happen when people do things like use
+                    // a semicolon to delimit object literal members.   Note: we'll have already
+                    // reported an error when we called parseExpected above.
+                    if (considerSemicolonAsDelimiter && token() === 25 /* SemicolonToken */ && !scanner.hasPrecedingLineBreak()) {
                         nextToken();
                     }
                     if (startPos === scanner.getStartPos()) {
+                        // What we're parsing isn't actually remotely recognizable as a element and we've consumed no tokens whatsoever
+                        // Consume a token to advance the parser in some way and avoid an infinite loop
+                        // This can happen when we're speculatively parsing parenthesized expressions which we think may be arrow functions,
+                        // or when a modifier keyword which is disallowed as a parameter name (ie, `static` in strict mode) is supplied
                         nextToken();
                     }
                     continue;
@@ -14583,7 +16823,13 @@ var ts;
             }
             parsingContext = saveParsingContext;
             var result = createNodeArray(list, listPos);
+            // Recording the trailing comma is deliberately done after the previous
+            // loop, and not just if we see a list terminator. This is because the list
+            // may have ended incorrectly, but it is still important to know if there
+            // was a trailing comma.
+            // Check if the last token was a comma.
             if (commaStart >= 0) {
+                // Always preserve a trailing comma by marking it on the NodeArray
                 result.hasTrailingComma = true;
             }
             return result;
@@ -14602,8 +16848,9 @@ var ts;
         function parseEntityName(allowReservedWords, diagnosticMessage) {
             var entity = allowReservedWords ? parseIdentifierName(diagnosticMessage) : parseIdentifier(diagnosticMessage);
             var dotPos = scanner.getStartPos();
-            while (parseOptional(23)) {
-                if (token() === 27) {
+            while (parseOptional(23 /* DotToken */)) {
+                if (token() === 27 /* LessThanToken */) {
+                    // the entity is part of a JSDoc-style generic, so record the trailing dot for later error reporting
                     entity.jsdocDotPos = dotPos;
                     break;
                 }
@@ -14613,42 +16860,64 @@ var ts;
             return entity;
         }
         function createQualifiedName(entity, name) {
-            var node = createNode(146, entity.pos);
+            var node = createNode(146 /* QualifiedName */, entity.pos);
             node.left = entity;
             node.right = name;
             return finishNode(node);
         }
         function parseRightSideOfDot(allowIdentifierNames) {
+            // Technically a keyword is valid here as all identifiers and keywords are identifier names.
+            // However, often we'll encounter this in error situations when the identifier or keyword
+            // is actually starting another valid construct.
+            //
+            // So, we check for the following specific case:
+            //
+            //      name.
+            //      identifierOrKeyword identifierNameOrKeyword
+            //
+            // Note: the newlines are important here.  For example, if that above code
+            // were rewritten into:
+            //
+            //      name.identifierOrKeyword
+            //      identifierNameOrKeyword
+            //
+            // Then we would consider it valid.  That's because ASI would take effect and
+            // the code would be implicitly: "name.identifierOrKeyword; identifierNameOrKeyword".
+            // In the first case though, ASI will not take effect because there is not a
+            // line terminator after the identifier or keyword.
             if (scanner.hasPrecedingLineBreak() && ts.tokenIsIdentifierOrKeyword(token())) {
                 var matchesPattern = lookAhead(nextTokenIsIdentifierOrKeywordOnSameLine);
                 if (matchesPattern) {
-                    return createMissingNode(71, true, ts.Diagnostics.Identifier_expected);
+                    // Report that we need an identifier.  However, report it right after the dot,
+                    // and not on the next token.  This is because the next token might actually
+                    // be an identifier and the error would be quite confusing.
+                    return createMissingNode(71 /* Identifier */, /*reportAtCurrentPosition*/ true, ts.Diagnostics.Identifier_expected);
                 }
             }
             return allowIdentifierNames ? parseIdentifierName() : parseIdentifier();
         }
         function parseTemplateExpression() {
-            var template = createNode(202);
+            var template = createNode(202 /* TemplateExpression */);
             template.head = parseTemplateHead();
-            ts.Debug.assert(template.head.kind === 14, "Template head has wrong token kind");
+            ts.Debug.assert(template.head.kind === 14 /* TemplateHead */, "Template head has wrong token kind");
             var list = [];
             var listPos = getNodePos();
             do {
                 list.push(parseTemplateSpan());
-            } while (ts.last(list).literal.kind === 15);
+            } while (ts.last(list).literal.kind === 15 /* TemplateMiddle */);
             template.templateSpans = createNodeArray(list, listPos);
             return finishNode(template);
         }
         function parseTemplateSpan() {
-            var span = createNode(211);
+            var span = createNode(211 /* TemplateSpan */);
             span.expression = allowInAnd(parseExpression);
             var literal;
-            if (token() === 18) {
+            if (token() === 18 /* CloseBraceToken */) {
                 reScanTemplateToken();
                 literal = parseTemplateMiddleOrTemplateTail();
             }
             else {
-                literal = parseExpectedToken(16, ts.Diagnostics._0_expected, ts.tokenToString(18));
+                literal = parseExpectedToken(16 /* TemplateTail */, ts.Diagnostics._0_expected, ts.tokenToString(18 /* CloseBraceToken */));
             }
             span.literal = literal;
             return finishNode(span);
@@ -14658,12 +16927,12 @@ var ts;
         }
         function parseTemplateHead() {
             var fragment = parseLiteralLikeNode(token());
-            ts.Debug.assert(fragment.kind === 14, "Template head has wrong token kind");
+            ts.Debug.assert(fragment.kind === 14 /* TemplateHead */, "Template head has wrong token kind");
             return fragment;
         }
         function parseTemplateMiddleOrTemplateTail() {
             var fragment = parseLiteralLikeNode(token());
-            ts.Debug.assert(fragment.kind === 15 || fragment.kind === 16, "Template fragment has wrong token kind");
+            ts.Debug.assert(fragment.kind === 15 /* TemplateMiddle */ || fragment.kind === 16 /* TemplateTail */, "Template fragment has wrong token kind");
             return fragment;
         }
         function parseLiteralLikeNode(kind) {
@@ -14676,37 +16945,61 @@ var ts;
             if (scanner.isUnterminated()) {
                 node.isUnterminated = true;
             }
-            if (node.kind === 8) {
-                node.numericLiteralFlags = scanner.getTokenFlags() & 1008;
+            // Octal literals are not allowed in strict mode or ES5
+            // Note that theoretically the following condition would hold true literals like 009,
+            // which is not octal.But because of how the scanner separates the tokens, we would
+            // never get a token like this. Instead, we would get 00 and 9 as two separate tokens.
+            // We also do not need to check for negatives because any prefix operator would be part of a
+            // parent unary expression.
+            if (node.kind === 8 /* NumericLiteral */) {
+                node.numericLiteralFlags = scanner.getTokenFlags() & 1008 /* NumericLiteralFlags */;
             }
             nextToken();
             finishNode(node);
             return node;
         }
+        // TYPES
         function parseTypeReference() {
-            var node = createNode(162);
-            node.typeName = parseEntityName(true, ts.Diagnostics.Type_expected);
-            if (!scanner.hasPrecedingLineBreak() && token() === 27) {
-                node.typeArguments = parseBracketedList(19, parseType, 27, 29);
+            var node = createNode(162 /* TypeReference */);
+            node.typeName = parseEntityName(/*allowReservedWords*/ true, ts.Diagnostics.Type_expected);
+            if (!scanner.hasPrecedingLineBreak() && token() === 27 /* LessThanToken */) {
+                node.typeArguments = parseBracketedList(19 /* TypeArguments */, parseType, 27 /* LessThanToken */, 29 /* GreaterThanToken */);
             }
             return finishNode(node);
         }
+        // If true, we should abort parsing an error function.
+        function typeHasArrowFunctionBlockingParseError(node) {
+            switch (node.kind) {
+                case 162 /* TypeReference */:
+                    return ts.nodeIsMissing(node.typeName);
+                case 163 /* FunctionType */:
+                case 164 /* ConstructorType */: {
+                    var _a = node, parameters = _a.parameters, type = _a.type;
+                    // parameters.pos === parameters.end only if we used parseMissingList, else should contain at least `()`
+                    return parameters.pos === parameters.end || typeHasArrowFunctionBlockingParseError(type);
+                }
+                case 173 /* ParenthesizedType */:
+                    return typeHasArrowFunctionBlockingParseError(node.type);
+                default:
+                    return false;
+            }
+        }
         function parseThisTypePredicate(lhs) {
             nextToken();
-            var node = createNode(161, lhs.pos);
+            var node = createNode(161 /* TypePredicate */, lhs.pos);
             node.parameterName = lhs;
             node.type = parseType();
             return finishNode(node);
         }
         function parseThisTypeNode() {
-            var node = createNode(174);
+            var node = createNode(174 /* ThisType */);
             nextToken();
             return finishNode(node);
         }
         function parseJSDocAllType(postFixEquals) {
-            var result = createNode(279);
+            var result = createNode(279 /* JSDocAllType */);
             if (postFixEquals) {
-                return createJSDocPostfixType(283, result);
+                return createJSDocPostfixType(283 /* JSDocOptionalType */, result);
             }
             else {
                 nextToken();
@@ -14714,184 +17007,252 @@ var ts;
             return finishNode(result);
         }
         function parseJSDocNonNullableType() {
-            var result = createNode(282);
+            var result = createNode(282 /* JSDocNonNullableType */);
             nextToken();
             result.type = parseNonArrayType();
             return finishNode(result);
         }
         function parseJSDocUnknownOrNullableType() {
             var pos = scanner.getStartPos();
+            // skip the ?
             nextToken();
-            if (token() === 26 ||
-                token() === 18 ||
-                token() === 20 ||
-                token() === 29 ||
-                token() === 58 ||
-                token() === 49) {
-                var result = createNode(280, pos);
+            // Need to lookahead to decide if this is a nullable or unknown type.
+            // Here are cases where we'll pick the unknown type:
+            //
+            //      Foo(?,
+            //      { a: ? }
+            //      Foo(?)
+            //      Foo<?>
+            //      Foo(?=
+            //      (?|
+            if (token() === 26 /* CommaToken */ ||
+                token() === 18 /* CloseBraceToken */ ||
+                token() === 20 /* CloseParenToken */ ||
+                token() === 29 /* GreaterThanToken */ ||
+                token() === 58 /* EqualsToken */ ||
+                token() === 49 /* BarToken */) {
+                var result = createNode(280 /* JSDocUnknownType */, pos);
                 return finishNode(result);
             }
             else {
-                var result = createNode(281, pos);
+                var result = createNode(281 /* JSDocNullableType */, pos);
                 result.type = parseType();
                 return finishNode(result);
             }
         }
         function parseJSDocFunctionType() {
             if (lookAhead(nextTokenIsOpenParen)) {
-                var result = createNodeWithJSDoc(284);
+                var result = createNodeWithJSDoc(284 /* JSDocFunctionType */);
                 nextToken();
-                fillSignature(56, 4 | 32, result);
+                fillSignature(56 /* ColonToken */, 4 /* Type */ | 32 /* JSDoc */, result);
                 return finishNode(result);
             }
-            var node = createNode(162);
+            var node = createNode(162 /* TypeReference */);
             node.typeName = parseIdentifierName();
             return finishNode(node);
         }
         function parseJSDocParameter() {
-            var parameter = createNode(149);
-            if (token() === 99 || token() === 94) {
+            var parameter = createNode(149 /* Parameter */);
+            if (token() === 99 /* ThisKeyword */ || token() === 94 /* NewKeyword */) {
                 parameter.name = parseIdentifierName();
-                parseExpected(56);
+                parseExpected(56 /* ColonToken */);
             }
             parameter.type = parseJSDocType();
             return finishNode(parameter);
         }
         function parseJSDocType() {
-            var dotdotdot = parseOptionalToken(24);
+            var dotdotdot = parseOptionalToken(24 /* DotDotDotToken */);
             var type = parseType();
             if (dotdotdot) {
-                var variadic = createNode(285, dotdotdot.pos);
+                var variadic = createNode(285 /* JSDocVariadicType */, dotdotdot.pos);
                 variadic.type = type;
                 type = finishNode(variadic);
             }
-            if (token() === 58) {
-                return createJSDocPostfixType(283, type);
+            if (token() === 58 /* EqualsToken */) {
+                return createJSDocPostfixType(283 /* JSDocOptionalType */, type);
             }
             return type;
         }
         function parseTypeQuery() {
-            var node = createNode(165);
-            parseExpected(103);
-            node.exprName = parseEntityName(true);
+            var node = createNode(165 /* TypeQuery */);
+            parseExpected(103 /* TypeOfKeyword */);
+            node.exprName = parseEntityName(/*allowReservedWords*/ true);
             return finishNode(node);
         }
         function parseTypeParameter() {
-            var node = createNode(148);
+            var node = createNode(148 /* TypeParameter */);
             node.name = parseIdentifier();
-            if (parseOptional(85)) {
+            if (parseOptional(85 /* ExtendsKeyword */)) {
+                // It's not uncommon for people to write improper constraints to a generic.  If the
+                // user writes a constraint that is an expression and not an actual type, then parse
+                // it out as an expression (so we can recover well), but report that a type is needed
+                // instead.
                 if (isStartOfType() || !isStartOfExpression()) {
                     node.constraint = parseType();
                 }
                 else {
+                    // It was not a type, and it looked like an expression.  Parse out an expression
+                    // here so we recover well.  Note: it is important that we call parseUnaryExpression
+                    // and not parseExpression here.  If the user has:
+                    //
+                    //      <T extends "">
+                    //
+                    // We do *not* want to consume the `>` as we're consuming the expression for "".
                     node.expression = parseUnaryExpressionOrHigher();
                 }
             }
-            if (parseOptional(58)) {
+            if (parseOptional(58 /* EqualsToken */)) {
                 node.default = parseType();
             }
             return finishNode(node);
         }
         function parseTypeParameters() {
-            if (token() === 27) {
-                return parseBracketedList(18, parseTypeParameter, 27, 29);
+            if (token() === 27 /* LessThanToken */) {
+                return parseBracketedList(18 /* TypeParameters */, parseTypeParameter, 27 /* LessThanToken */, 29 /* GreaterThanToken */);
             }
         }
         function parseParameterType() {
-            if (parseOptional(56)) {
+            if (parseOptional(56 /* ColonToken */)) {
                 return parseType();
             }
             return undefined;
         }
         function isStartOfParameter() {
-            return token() === 24 ||
+            return token() === 24 /* DotDotDotToken */ ||
                 isIdentifierOrPattern() ||
                 ts.isModifierKind(token()) ||
-                token() === 57 ||
-                isStartOfType(true);
+                token() === 57 /* AtToken */ ||
+                isStartOfType(/*inStartOfParameter*/ true);
         }
         function parseParameter() {
-            var node = createNodeWithJSDoc(149);
-            if (token() === 99) {
-                node.name = createIdentifier(true);
+            var node = createNodeWithJSDoc(149 /* Parameter */);
+            if (token() === 99 /* ThisKeyword */) {
+                node.name = createIdentifier(/*isIdentifier*/ true);
                 node.type = parseParameterType();
                 return finishNode(node);
             }
             node.decorators = parseDecorators();
             node.modifiers = parseModifiers();
-            node.dotDotDotToken = parseOptionalToken(24);
+            node.dotDotDotToken = parseOptionalToken(24 /* DotDotDotToken */);
+            // FormalParameter [Yield,Await]:
+            //      BindingElement[?Yield,?Await]
             node.name = parseIdentifierOrPattern();
             if (ts.getFullWidth(node.name) === 0 && !ts.hasModifiers(node) && ts.isModifierKind(token())) {
+                // in cases like
+                // 'use strict'
+                // function foo(static)
+                // isParameter('static') === true, because of isModifier('static')
+                // however 'static' is not a legal identifier in a strict mode.
+                // so result of this function will be ParameterDeclaration (flags = 0, name = missing, type = undefined, initializer = undefined)
+                // and current token will not change => parsing of the enclosing parameter list will last till the end of time (or OOM)
+                // to avoid this we'll advance cursor to the next token.
                 nextToken();
             }
-            node.questionToken = parseOptionalToken(55);
+            node.questionToken = parseOptionalToken(55 /* QuestionToken */);
             node.type = parseParameterType();
             node.initializer = parseInitializer();
             return finishNode(node);
         }
+        /**
+         * Note: If returnToken is EqualsGreaterThanToken, `signature.type` will always be defined.
+         * @returns If return type parsing succeeds
+         */
         function fillSignature(returnToken, flags, signature) {
-            if (!(flags & 32)) {
+            if (!(flags & 32 /* JSDoc */)) {
                 signature.typeParameters = parseTypeParameters();
             }
-            signature.parameters = parseParameterList(flags);
-            if (shouldParseReturnType(returnToken, !!(flags & 4))) {
+            var parametersParsedSuccessfully = parseParameterList(signature, flags);
+            if (shouldParseReturnType(returnToken, !!(flags & 4 /* Type */))) {
                 signature.type = parseTypeOrTypePredicate();
-                return signature.type !== undefined;
+                if (typeHasArrowFunctionBlockingParseError(signature.type))
+                    return false;
             }
-            return true;
+            return parametersParsedSuccessfully;
         }
         function shouldParseReturnType(returnToken, isType) {
-            if (returnToken === 36) {
+            if (returnToken === 36 /* EqualsGreaterThanToken */) {
                 parseExpected(returnToken);
                 return true;
             }
-            else if (parseOptional(56)) {
+            else if (parseOptional(56 /* ColonToken */)) {
                 return true;
             }
-            else if (isType && token() === 36) {
-                parseErrorAtCurrentToken(ts.Diagnostics._0_expected, ts.tokenToString(56));
+            else if (isType && token() === 36 /* EqualsGreaterThanToken */) {
+                // This is easy to get backward, especially in type contexts, so parse the type anyway
+                parseErrorAtCurrentToken(ts.Diagnostics._0_expected, ts.tokenToString(56 /* ColonToken */));
                 nextToken();
                 return true;
             }
             return false;
         }
-        function parseParameterList(flags) {
-            if (parseExpected(19)) {
-                var savedYieldContext = inYieldContext();
-                var savedAwaitContext = inAwaitContext();
-                setYieldContext(!!(flags & 1));
-                setAwaitContext(!!(flags & 2));
-                var result = parseDelimitedList(16, flags & 32 ? parseJSDocParameter : parseParameter);
-                setYieldContext(savedYieldContext);
-                setAwaitContext(savedAwaitContext);
-                if (!parseExpected(20) && (flags & 8)) {
-                    return undefined;
-                }
-                return result;
+        // Returns true on success.
+        function parseParameterList(signature, flags) {
+            // FormalParameters [Yield,Await]: (modified)
+            //      [empty]
+            //      FormalParameterList[?Yield,Await]
+            //
+            // FormalParameter[Yield,Await]: (modified)
+            //      BindingElement[?Yield,Await]
+            //
+            // BindingElement [Yield,Await]: (modified)
+            //      SingleNameBinding[?Yield,?Await]
+            //      BindingPattern[?Yield,?Await]Initializer [In, ?Yield,?Await] opt
+            //
+            // SingleNameBinding [Yield,Await]:
+            //      BindingIdentifier[?Yield,?Await]Initializer [In, ?Yield,?Await] opt
+            if (!parseExpected(19 /* OpenParenToken */)) {
+                signature.parameters = createMissingList();
+                return false;
             }
-            return (flags & 8) ? undefined : createMissingList();
+            var savedYieldContext = inYieldContext();
+            var savedAwaitContext = inAwaitContext();
+            setYieldContext(!!(flags & 1 /* Yield */));
+            setAwaitContext(!!(flags & 2 /* Await */));
+            signature.parameters = parseDelimitedList(16 /* Parameters */, flags & 32 /* JSDoc */ ? parseJSDocParameter : parseParameter);
+            setYieldContext(savedYieldContext);
+            setAwaitContext(savedAwaitContext);
+            return parseExpected(20 /* CloseParenToken */);
         }
         function parseTypeMemberSemicolon() {
-            if (parseOptional(26)) {
+            // We allow type members to be separated by commas or (possibly ASI) semicolons.
+            // First check if it was a comma.  If so, we're done with the member.
+            if (parseOptional(26 /* CommaToken */)) {
                 return;
             }
+            // Didn't have a comma.  We must have a (possible ASI) semicolon.
             parseSemicolon();
         }
         function parseSignatureMember(kind) {
             var node = createNodeWithJSDoc(kind);
-            if (kind === 159) {
-                parseExpected(94);
+            if (kind === 159 /* ConstructSignature */) {
+                parseExpected(94 /* NewKeyword */);
             }
-            fillSignature(56, 4, node);
+            fillSignature(56 /* ColonToken */, 4 /* Type */, node);
             parseTypeMemberSemicolon();
             return finishNode(node);
         }
         function isIndexSignature() {
-            return token() === 21 && lookAhead(isUnambiguouslyIndexSignature);
+            return token() === 21 /* OpenBracketToken */ && lookAhead(isUnambiguouslyIndexSignature);
         }
         function isUnambiguouslyIndexSignature() {
+            // The only allowed sequence is:
+            //
+            //   [id:
+            //
+            // However, for error recovery, we also check the following cases:
+            //
+            //   [...
+            //   [id,
+            //   [id?,
+            //   [id?:
+            //   [id?]
+            //   [public id
+            //   [private id
+            //   [protected id
+            //   []
+            //
             nextToken();
-            if (token() === 24 || token() === 22) {
+            if (token() === 24 /* DotDotDotToken */ || token() === 22 /* CloseBracketToken */) {
                 return true;
             }
             if (ts.isModifierKind(token())) {
@@ -14904,35 +17265,48 @@ var ts;
                 return false;
             }
             else {
+                // Skip the identifier
                 nextToken();
             }
-            if (token() === 56 || token() === 26) {
+            // A colon signifies a well formed indexer
+            // A comma should be a badly formed indexer because comma expressions are not allowed
+            // in computed properties.
+            if (token() === 56 /* ColonToken */ || token() === 26 /* CommaToken */) {
                 return true;
             }
-            if (token() !== 55) {
+            // Question mark could be an indexer with an optional property,
+            // or it could be a conditional expression in a computed property.
+            if (token() !== 55 /* QuestionToken */) {
                 return false;
             }
+            // If any of the following tokens are after the question mark, it cannot
+            // be a conditional expression, so treat it as an indexer.
             nextToken();
-            return token() === 56 || token() === 26 || token() === 22;
+            return token() === 56 /* ColonToken */ || token() === 26 /* CommaToken */ || token() === 22 /* CloseBracketToken */;
         }
         function parseIndexSignatureDeclaration(node) {
-            node.kind = 160;
-            node.parameters = parseBracketedList(16, parseParameter, 21, 22);
+            node.kind = 160 /* IndexSignature */;
+            node.parameters = parseBracketedList(16 /* Parameters */, parseParameter, 21 /* OpenBracketToken */, 22 /* CloseBracketToken */);
             node.type = parseTypeAnnotation();
             parseTypeMemberSemicolon();
             return finishNode(node);
         }
         function parsePropertyOrMethodSignature(node) {
             node.name = parsePropertyName();
-            node.questionToken = parseOptionalToken(55);
-            if (token() === 19 || token() === 27) {
-                node.kind = 153;
-                fillSignature(56, 4, node);
+            node.questionToken = parseOptionalToken(55 /* QuestionToken */);
+            if (token() === 19 /* OpenParenToken */ || token() === 27 /* LessThanToken */) {
+                node.kind = 153 /* MethodSignature */;
+                // Method signatures don't exist in expression contexts.  So they have neither
+                // [Yield] nor [Await]
+                fillSignature(56 /* ColonToken */, 4 /* Type */, node);
             }
             else {
-                node.kind = 151;
+                node.kind = 151 /* PropertySignature */;
                 node.type = parseTypeAnnotation();
-                if (token() === 58) {
+                if (token() === 58 /* EqualsToken */) {
+                    // Although type literal properties cannot not have initializers, we attempt
+                    // to parse an initializer so we can report in the checker that an interface
+                    // property or type literal property cannot have an initializer.
                     node.initializer = parseInitializer();
                 }
             }
@@ -14940,39 +17314,45 @@ var ts;
             return finishNode(node);
         }
         function isTypeMemberStart() {
-            if (token() === 19 || token() === 27) {
+            // Return true if we have the start of a signature member
+            if (token() === 19 /* OpenParenToken */ || token() === 27 /* LessThanToken */) {
                 return true;
             }
             var idToken = false;
+            // Eat up all modifiers, but hold on to the last one in case it is actually an identifier
             while (ts.isModifierKind(token())) {
                 idToken = true;
                 nextToken();
             }
-            if (token() === 21) {
+            // Index signatures and computed property names are type members
+            if (token() === 21 /* OpenBracketToken */) {
                 return true;
             }
+            // Try to get the first property-like token following all modifiers
             if (isLiteralPropertyName()) {
                 idToken = true;
                 nextToken();
             }
+            // If we were able to get any potential identifier, check that it is
+            // the start of a member declaration
             if (idToken) {
-                return token() === 19 ||
-                    token() === 27 ||
-                    token() === 55 ||
-                    token() === 56 ||
-                    token() === 26 ||
+                return token() === 19 /* OpenParenToken */ ||
+                    token() === 27 /* LessThanToken */ ||
+                    token() === 55 /* QuestionToken */ ||
+                    token() === 56 /* ColonToken */ ||
+                    token() === 26 /* CommaToken */ ||
                     canParseSemicolon();
             }
             return false;
         }
         function parseTypeMember() {
-            if (token() === 19 || token() === 27) {
-                return parseSignatureMember(158);
+            if (token() === 19 /* OpenParenToken */ || token() === 27 /* LessThanToken */) {
+                return parseSignatureMember(158 /* CallSignature */);
             }
-            if (token() === 94 && lookAhead(nextTokenIsOpenParenOrLessThan)) {
-                return parseSignatureMember(159);
+            if (token() === 94 /* NewKeyword */ && lookAhead(nextTokenIsOpenParenOrLessThan)) {
+                return parseSignatureMember(159 /* ConstructSignature */);
             }
-            var node = createNodeWithJSDoc(0);
+            var node = createNodeWithJSDoc(0 /* Unknown */);
             node.modifiers = parseModifiers();
             if (isIndexSignature()) {
                 return parseIndexSignatureDeclaration(node);
@@ -14981,30 +17361,30 @@ var ts;
         }
         function nextTokenIsOpenParenOrLessThan() {
             nextToken();
-            return token() === 19 || token() === 27;
+            return token() === 19 /* OpenParenToken */ || token() === 27 /* LessThanToken */;
         }
         function nextTokenIsDot() {
-            return nextToken() === 23;
+            return nextToken() === 23 /* DotToken */;
         }
         function nextTokenIsOpenParenOrLessThanOrDot() {
             switch (nextToken()) {
-                case 19:
-                case 27:
-                case 23:
+                case 19 /* OpenParenToken */:
+                case 27 /* LessThanToken */:
+                case 23 /* DotToken */:
                     return true;
             }
             return false;
         }
         function parseTypeLiteral() {
-            var node = createNode(166);
+            var node = createNode(166 /* TypeLiteral */);
             node.members = parseObjectTypeMembers();
             return finishNode(node);
         }
         function parseObjectTypeMembers() {
             var members;
-            if (parseExpected(17)) {
-                members = parseList(4, parseTypeMember);
-                parseExpected(18);
+            if (parseExpected(17 /* OpenBraceToken */)) {
+                members = parseList(4 /* TypeMembers */, parseTypeMember);
+                parseExpected(18 /* CloseBraceToken */);
             }
             else {
                 members = createMissingList();
@@ -15013,85 +17393,76 @@ var ts;
         }
         function isStartOfMappedType() {
             nextToken();
-            if (token() === 37 || token() === 38) {
-                return nextToken() === 132;
+            if (token() === 37 /* PlusToken */ || token() === 38 /* MinusToken */) {
+                return nextToken() === 132 /* ReadonlyKeyword */;
             }
-            if (token() === 132) {
+            if (token() === 132 /* ReadonlyKeyword */) {
                 nextToken();
             }
-            return token() === 21 && nextTokenIsIdentifier() && nextToken() === 92;
+            return token() === 21 /* OpenBracketToken */ && nextTokenIsIdentifier() && nextToken() === 92 /* InKeyword */;
         }
         function parseMappedTypeParameter() {
-            var node = createNode(148);
+            var node = createNode(148 /* TypeParameter */);
             node.name = parseIdentifier();
-            parseExpected(92);
+            parseExpected(92 /* InKeyword */);
             node.constraint = parseType();
             return finishNode(node);
         }
         function parseMappedType() {
-            var node = createNode(177);
-            parseExpected(17);
-            if (token() === 132 || token() === 37 || token() === 38) {
+            var node = createNode(177 /* MappedType */);
+            parseExpected(17 /* OpenBraceToken */);
+            if (token() === 132 /* ReadonlyKeyword */ || token() === 37 /* PlusToken */ || token() === 38 /* MinusToken */) {
                 node.readonlyToken = parseTokenNode();
-                if (node.readonlyToken.kind !== 132) {
-                    parseExpectedToken(132);
+                if (node.readonlyToken.kind !== 132 /* ReadonlyKeyword */) {
+                    parseExpectedToken(132 /* ReadonlyKeyword */);
                 }
             }
-            parseExpected(21);
+            parseExpected(21 /* OpenBracketToken */);
             node.typeParameter = parseMappedTypeParameter();
-            parseExpected(22);
-            if (token() === 55 || token() === 37 || token() === 38) {
+            parseExpected(22 /* CloseBracketToken */);
+            if (token() === 55 /* QuestionToken */ || token() === 37 /* PlusToken */ || token() === 38 /* MinusToken */) {
                 node.questionToken = parseTokenNode();
-                if (node.questionToken.kind !== 55) {
-                    parseExpectedToken(55);
+                if (node.questionToken.kind !== 55 /* QuestionToken */) {
+                    parseExpectedToken(55 /* QuestionToken */);
                 }
             }
             node.type = parseTypeAnnotation();
             parseSemicolon();
-            parseExpected(18);
+            parseExpected(18 /* CloseBraceToken */);
             return finishNode(node);
         }
         function parseTupleType() {
-            var node = createNode(168);
-            node.elementTypes = parseBracketedList(20, parseType, 21, 22);
+            var node = createNode(168 /* TupleType */);
+            node.elementTypes = parseBracketedList(20 /* TupleElementTypes */, parseType, 21 /* OpenBracketToken */, 22 /* CloseBracketToken */);
             return finishNode(node);
         }
         function parseParenthesizedType() {
-            var node = createNode(173);
-            parseExpected(19);
+            var node = createNode(173 /* ParenthesizedType */);
+            parseExpected(19 /* OpenParenToken */);
             node.type = parseType();
-            if (!node.type) {
-                return undefined;
-            }
-            parseExpected(20);
+            parseExpected(20 /* CloseParenToken */);
             return finishNode(node);
         }
-        function parseFunctionOrConstructorType(kind) {
-            var node = createNodeWithJSDoc(kind);
-            if (kind === 164) {
-                parseExpected(94);
-            }
-            if (!fillSignature(36, 4 | (sourceFile.languageVariant === 1 ? 8 : 0), node)) {
-                return undefined;
-            }
-            if (!node.parameters) {
-                return undefined;
-            }
+        function parseFunctionOrConstructorType() {
+            var pos = getNodePos();
+            var kind = parseOptional(94 /* NewKeyword */) ? 164 /* ConstructorType */ : 163 /* FunctionType */;
+            var node = createNodeWithJSDoc(kind, pos);
+            fillSignature(36 /* EqualsGreaterThanToken */, 4 /* Type */, node);
             return finishNode(node);
         }
         function parseKeywordAndNoDot() {
             var node = parseTokenNode();
-            return token() === 23 ? undefined : node;
+            return token() === 23 /* DotToken */ ? undefined : node;
         }
         function parseLiteralTypeNode(negative) {
-            var node = createNode(178);
+            var node = createNode(178 /* LiteralType */);
             var unaryMinusExpression;
             if (negative) {
-                unaryMinusExpression = createNode(198);
-                unaryMinusExpression.operator = 38;
+                unaryMinusExpression = createNode(198 /* PrefixUnaryExpression */);
+                unaryMinusExpression.operator = 38 /* MinusToken */;
                 nextToken();
             }
-            var expression = token() === 101 || token() === 86
+            var expression = token() === 101 /* TrueKeyword */ || token() === 86 /* FalseKeyword */
                 ? parseTokenNode()
                 : parseLiteralLikeNode(token());
             if (negative) {
@@ -15104,78 +17475,79 @@ var ts;
         }
         function isStartOfTypeOfImportType() {
             nextToken();
-            return token() === 91;
+            return token() === 91 /* ImportKeyword */;
         }
         function parseImportType() {
-            sourceFile.flags |= 524288;
-            var node = createNode(179);
-            if (parseOptional(103)) {
+            sourceFile.flags |= 524288 /* PossiblyContainsDynamicImport */;
+            var node = createNode(179 /* ImportType */);
+            if (parseOptional(103 /* TypeOfKeyword */)) {
                 node.isTypeOf = true;
             }
-            parseExpected(91);
-            parseExpected(19);
+            parseExpected(91 /* ImportKeyword */);
+            parseExpected(19 /* OpenParenToken */);
             node.argument = parseType();
-            parseExpected(20);
-            if (parseOptional(23)) {
-                node.qualifier = parseEntityName(true, ts.Diagnostics.Type_expected);
+            parseExpected(20 /* CloseParenToken */);
+            if (parseOptional(23 /* DotToken */)) {
+                node.qualifier = parseEntityName(/*allowReservedWords*/ true, ts.Diagnostics.Type_expected);
             }
             node.typeArguments = tryParseTypeArguments();
             return finishNode(node);
         }
         function nextTokenIsNumericLiteral() {
-            return nextToken() === 8;
+            return nextToken() === 8 /* NumericLiteral */;
         }
         function parseNonArrayType() {
             switch (token()) {
-                case 119:
-                case 142:
-                case 137:
-                case 134:
-                case 138:
-                case 122:
-                case 140:
-                case 131:
-                case 135:
+                case 119 /* AnyKeyword */:
+                case 142 /* UnknownKeyword */:
+                case 137 /* StringKeyword */:
+                case 134 /* NumberKeyword */:
+                case 138 /* SymbolKeyword */:
+                case 122 /* BooleanKeyword */:
+                case 140 /* UndefinedKeyword */:
+                case 131 /* NeverKeyword */:
+                case 135 /* ObjectKeyword */:
+                    // If these are followed by a dot, then parse these out as a dotted type reference instead.
                     return tryParse(parseKeywordAndNoDot) || parseTypeReference();
-                case 39:
-                    return parseJSDocAllType(false);
-                case 61:
-                    return parseJSDocAllType(true);
-                case 55:
+                case 39 /* AsteriskToken */:
+                    return parseJSDocAllType(/*postfixEquals*/ false);
+                case 61 /* AsteriskEqualsToken */:
+                    return parseJSDocAllType(/*postfixEquals*/ true);
+                case 55 /* QuestionToken */:
                     return parseJSDocUnknownOrNullableType();
-                case 89:
+                case 89 /* FunctionKeyword */:
                     return parseJSDocFunctionType();
-                case 51:
+                case 51 /* ExclamationToken */:
                     return parseJSDocNonNullableType();
-                case 13:
-                case 9:
-                case 8:
-                case 101:
-                case 86:
+                case 13 /* NoSubstitutionTemplateLiteral */:
+                case 9 /* StringLiteral */:
+                case 8 /* NumericLiteral */:
+                case 101 /* TrueKeyword */:
+                case 86 /* FalseKeyword */:
                     return parseLiteralTypeNode();
-                case 38:
-                    return lookAhead(nextTokenIsNumericLiteral) ? parseLiteralTypeNode(true) : parseTypeReference();
-                case 105:
-                case 95:
+                case 38 /* MinusToken */:
+                    return lookAhead(nextTokenIsNumericLiteral) ? parseLiteralTypeNode(/*negative*/ true) : parseTypeReference();
+                case 105 /* VoidKeyword */:
+                case 95 /* NullKeyword */:
                     return parseTokenNode();
-                case 99: {
+                case 99 /* ThisKeyword */: {
                     var thisKeyword = parseThisTypeNode();
-                    if (token() === 127 && !scanner.hasPrecedingLineBreak()) {
+                    if (token() === 127 /* IsKeyword */ && !scanner.hasPrecedingLineBreak()) {
                         return parseThisTypePredicate(thisKeyword);
                     }
                     else {
                         return thisKeyword;
                     }
                 }
-                case 103:
+                case 103 /* TypeOfKeyword */:
                     return lookAhead(isStartOfTypeOfImportType) ? parseImportType() : parseTypeQuery();
-                case 17:
+                case 17 /* OpenBraceToken */:
                     return lookAhead(isStartOfMappedType) ? parseMappedType() : parseTypeLiteral();
-                case 21:
+                case 21 /* OpenBracketToken */:
                     return parseTupleType();
-                case 19:
+                case 19 /* OpenParenToken */:
                     return parseParenthesizedType();
-                case 91:
+                case 91 /* ImportKeyword */:
                     return parseImportType();
                 default:
                     return parseTypeReference();
@@ -15183,40 +17555,42 @@ var ts;
         }
         function isStartOfType(inStartOfParameter) {
             switch (token()) {
-                case 119:
-                case 142:
-                case 137:
-                case 134:
-                case 122:
-                case 138:
-                case 141:
-                case 105:
-                case 140:
-                case 95:
-                case 99:
-                case 103:
-                case 131:
-                case 17:
-                case 21:
-                case 27:
-                case 49:
-                case 48:
-                case 94:
-                case 9:
-                case 8:
-                case 101:
-                case 86:
-                case 135:
-                case 39:
-                case 55:
-                case 51:
-                case 24:
-                case 126:
-                case 91:
+                case 119 /* AnyKeyword */:
+                case 142 /* UnknownKeyword */:
+                case 137 /* StringKeyword */:
+                case 134 /* NumberKeyword */:
+                case 122 /* BooleanKeyword */:
+                case 138 /* SymbolKeyword */:
+                case 141 /* UniqueKeyword */:
+                case 105 /* VoidKeyword */:
+                case 140 /* UndefinedKeyword */:
+                case 95 /* NullKeyword */:
+                case 99 /* ThisKeyword */:
+                case 103 /* TypeOfKeyword */:
+                case 131 /* NeverKeyword */:
+                case 17 /* OpenBraceToken */:
+                case 21 /* OpenBracketToken */:
+                case 27 /* LessThanToken */:
+                case 49 /* BarToken */:
+                case 48 /* AmpersandToken */:
+                case 94 /* NewKeyword */:
+                case 9 /* StringLiteral */:
+                case 8 /* NumericLiteral */:
+                case 101 /* TrueKeyword */:
+                case 86 /* FalseKeyword */:
+                case 135 /* ObjectKeyword */:
+                case 39 /* AsteriskToken */:
+                case 55 /* QuestionToken */:
+                case 51 /* ExclamationToken */:
+                case 24 /* DotDotDotToken */:
+                case 126 /* InferKeyword */:
+                case 91 /* ImportKeyword */:
                     return true;
-                case 38:
+                case 38 /* MinusToken */:
                     return !inStartOfParameter && lookAhead(nextTokenIsNumericLiteral);
-                case 19:
+                case 19 /* OpenParenToken */:
+                    // Only consider '(' the start of a type if followed by ')', '...', an identifier, a modifier,
+                    // or something that starts a type. We don't want to consider things like '(1)' a type.
                     return !inStartOfParameter && lookAhead(isStartOfParenthesizedOrFunctionType);
                 default:
                     return isIdentifier();
@@ -15224,34 +17598,35 @@ var ts;
         }
         function isStartOfParenthesizedOrFunctionType() {
             nextToken();
-            return token() === 20 || isStartOfParameter() || isStartOfType();
+            return token() === 20 /* CloseParenToken */ || isStartOfParameter() || isStartOfType();
         }
         function parsePostfixTypeOrHigher() {
             var type = parseNonArrayType();
             while (!scanner.hasPrecedingLineBreak()) {
                 switch (token()) {
-                    case 51:
-                        type = createJSDocPostfixType(282, type);
+                    case 51 /* ExclamationToken */:
+                        type = createJSDocPostfixType(282 /* JSDocNonNullableType */, type);
                         break;
-                    case 55:
-                        if (!(contextFlags & 2097152) && lookAhead(nextTokenIsStartOfType)) {
+                    case 55 /* QuestionToken */:
+                        // If not in JSDoc and next token is start of a type we have a conditional type
+                        if (!(contextFlags & 2097152 /* JSDoc */) && lookAhead(nextTokenIsStartOfType)) {
                             return type;
                         }
-                        type = createJSDocPostfixType(281, type);
+                        type = createJSDocPostfixType(281 /* JSDocNullableType */, type);
                         break;
-                    case 21:
-                        parseExpected(21);
+                    case 21 /* OpenBracketToken */:
+                        parseExpected(21 /* OpenBracketToken */);
                         if (isStartOfType()) {
-                            var node = createNode(176, type.pos);
+                            var node = createNode(176 /* IndexedAccessType */, type.pos);
                             node.objectType = type;
                             node.indexType = parseType();
-                            parseExpected(22);
+                            parseExpected(22 /* CloseBracketToken */);
                             type = finishNode(node);
                         }
                         else {
-                            var node = createNode(167, type.pos);
+                            var node = createNode(167 /* ArrayType */, type.pos);
                             node.elementType = type;
-                            parseExpected(22);
+                            parseExpected(22 /* CloseBracketToken */);
                             type = finishNode(node);
                         }
                         break;
@@ -15268,16 +17643,16 @@ var ts;
             return finishNode(postfix);
         }
         function parseTypeOperator(operator) {
-            var node = createNode(175);
+            var node = createNode(175 /* TypeOperator */);
             parseExpected(operator);
             node.operator = operator;
             node.type = parseTypeOperatorOrHigher();
             return finishNode(node);
         }
         function parseInferType() {
-            var node = createNode(172);
-            parseExpected(126);
-            var typeParameter = createNode(148);
+            var node = createNode(172 /* InferType */);
+            parseExpected(126 /* InferKeyword */);
+            var typeParameter = createNode(148 /* TypeParameter */);
             typeParameter.name = parseIdentifier();
             node.typeParameter = finishNode(typeParameter);
             return finishNode(node);
@@ -15285,10 +17660,10 @@ var ts;
         function parseTypeOperatorOrHigher() {
             var operator = token();
             switch (operator) {
-                case 128:
-                case 141:
+                case 128 /* KeyOfKeyword */:
+                case 141 /* UniqueKeyword */:
                     return parseTypeOperator(operator);
-                case 126:
+                case 126 /* InferKeyword */:
                     return parseInferType();
             }
             return parsePostfixTypeOrHigher();
@@ -15308,26 +17683,28 @@ var ts;
             return type;
         }
         function parseIntersectionTypeOrHigher() {
-            return parseUnionOrIntersectionType(170, parseTypeOperatorOrHigher, 48);
+            return parseUnionOrIntersectionType(170 /* IntersectionType */, parseTypeOperatorOrHigher, 48 /* AmpersandToken */);
         }
         function parseUnionTypeOrHigher() {
-            return parseUnionOrIntersectionType(169, parseIntersectionTypeOrHigher, 49);
+            return parseUnionOrIntersectionType(169 /* UnionType */, parseIntersectionTypeOrHigher, 49 /* BarToken */);
         }
         function isStartOfFunctionType() {
-            if (token() === 27) {
+            if (token() === 27 /* LessThanToken */) {
                 return true;
             }
-            return token() === 19 && lookAhead(isUnambiguouslyStartOfFunctionType);
+            return token() === 19 /* OpenParenToken */ && lookAhead(isUnambiguouslyStartOfFunctionType);
         }
         function skipParameterStart() {
             if (ts.isModifierKind(token())) {
+                // Skip modifiers
                 parseModifiers();
             }
-            if (isIdentifier() || token() === 99) {
+            if (isIdentifier() || token() === 99 /* ThisKeyword */) {
                 nextToken();
                 return true;
             }
-            if (token() === 21 || token() === 17) {
+            if (token() === 21 /* OpenBracketToken */ || token() === 17 /* OpenBraceToken */) {
+                // Return true if we can parse an array or object binding pattern with no errors
                 var previousErrorCount = parseDiagnostics.length;
                 parseIdentifierOrPattern();
                 return previousErrorCount === parseDiagnostics.length;
@@ -15336,17 +17713,26 @@ var ts;
         }
         function isUnambiguouslyStartOfFunctionType() {
             nextToken();
-            if (token() === 20 || token() === 24) {
+            if (token() === 20 /* CloseParenToken */ || token() === 24 /* DotDotDotToken */) {
+                // ( )
+                // ( ...
                 return true;
             }
             if (skipParameterStart()) {
-                if (token() === 56 || token() === 26 ||
-                    token() === 55 || token() === 58) {
+                // We successfully skipped modifiers (if any) and an identifier or binding pattern,
+                // now see if we have something that indicates a parameter declaration
+                if (token() === 56 /* ColonToken */ || token() === 26 /* CommaToken */ ||
+                    token() === 55 /* QuestionToken */ || token() === 58 /* EqualsToken */) {
+                    // ( xxx :
+                    // ( xxx ,
+                    // ( xxx ?
+                    // ( xxx =
                     return true;
                 }
-                if (token() === 20) {
+                if (token() === 20 /* CloseParenToken */) {
                     nextToken();
-                    if (token() === 36) {
+                    if (token() === 36 /* EqualsGreaterThanToken */) {
+                        // ( xxx ) =>
                         return true;
                     }
                 }
@@ -15357,7 +17743,7 @@ var ts;
             var typePredicateVariable = isIdentifier() && tryParse(parseTypePredicatePrefix);
             var type = parseType();
             if (typePredicateVariable) {
-                var node = createNode(161, typePredicateVariable.pos);
+                var node = createNode(161 /* TypePredicate */, typePredicateVariable.pos);
                 node.parameterName = typePredicateVariable;
                 node.type = type;
                 return finishNode(node);
@@ -15368,59 +17754,60 @@ var ts;
         }
         function parseTypePredicatePrefix() {
             var id = parseIdentifier();
-            if (token() === 127 && !scanner.hasPrecedingLineBreak()) {
+            if (token() === 127 /* IsKeyword */ && !scanner.hasPrecedingLineBreak()) {
                 nextToken();
                 return id;
             }
         }
         function parseType() {
-            return doOutsideOfContext(20480, parseTypeWorker);
+            // The rules about 'yield' only apply to actual code/expression contexts.  They don't
+            // apply to 'type' contexts.  So we disable these parameters here before moving on.
+            return doOutsideOfContext(20480 /* TypeExcludesFlags */, parseTypeWorker);
         }
         function parseTypeWorker(noConditionalTypes) {
-            if (isStartOfFunctionType()) {
-                return parseFunctionOrConstructorType(163);
-            }
-            if (token() === 94) {
-                return parseFunctionOrConstructorType(164);
+            if (isStartOfFunctionType() || token() === 94 /* NewKeyword */) {
+                return parseFunctionOrConstructorType();
             }
             var type = parseUnionTypeOrHigher();
-            if (!noConditionalTypes && !scanner.hasPrecedingLineBreak() && parseOptional(85)) {
-                var node = createNode(171, type.pos);
+            if (!noConditionalTypes && !scanner.hasPrecedingLineBreak() && parseOptional(85 /* ExtendsKeyword */)) {
+                var node = createNode(171 /* ConditionalType */, type.pos);
                 node.checkType = type;
-                node.extendsType = parseTypeWorker(true);
-                parseExpected(55);
+                // The type following 'extends' is not permitted to be another conditional type
+                node.extendsType = parseTypeWorker(/*noConditionalTypes*/ true);
+                parseExpected(55 /* QuestionToken */);
                 node.trueType = parseTypeWorker();
-                parseExpected(56);
+                parseExpected(56 /* ColonToken */);
                 node.falseType = parseTypeWorker();
                 return finishNode(node);
             }
             return type;
         }
         function parseTypeAnnotation() {
-            return parseOptional(56) ? parseType() : undefined;
+            return parseOptional(56 /* ColonToken */) ? parseType() : undefined;
         }
+        // EXPRESSIONS
         function isStartOfLeftHandSideExpression() {
             switch (token()) {
-                case 99:
-                case 97:
-                case 95:
-                case 101:
-                case 86:
-                case 8:
-                case 9:
-                case 13:
-                case 14:
-                case 19:
-                case 21:
-                case 17:
-                case 89:
-                case 75:
-                case 94:
-                case 41:
-                case 63:
-                case 71:
+                case 99 /* ThisKeyword */:
+                case 97 /* SuperKeyword */:
+                case 95 /* NullKeyword */:
+                case 101 /* TrueKeyword */:
+                case 86 /* FalseKeyword */:
+                case 8 /* NumericLiteral */:
+                case 9 /* StringLiteral */:
+                case 13 /* NoSubstitutionTemplateLiteral */:
+                case 14 /* TemplateHead */:
+                case 19 /* OpenParenToken */:
+                case 21 /* OpenBracketToken */:
+                case 17 /* OpenBraceToken */:
+                case 89 /* FunctionKeyword */:
+                case 75 /* ClassKeyword */:
+                case 94 /* NewKeyword */:
+                case 41 /* SlashToken */:
+                case 63 /* SlashEqualsToken */:
+                case 71 /* Identifier */:
                     return true;
-                case 91:
+                case 91 /* ImportKeyword */:
                     return lookAhead(nextTokenIsOpenParenOrLessThanOrDot);
                 default:
                     return isIdentifier();
@@ -15431,20 +17818,27 @@ var ts;
                 return true;
             }
             switch (token()) {
-                case 37:
-                case 38:
-                case 52:
-                case 51:
-                case 80:
-                case 103:
-                case 105:
-                case 43:
-                case 44:
-                case 27:
-                case 121:
-                case 116:
+                case 37 /* PlusToken */:
+                case 38 /* MinusToken */:
+                case 52 /* TildeToken */:
+                case 51 /* ExclamationToken */:
+                case 80 /* DeleteKeyword */:
+                case 103 /* TypeOfKeyword */:
+                case 105 /* VoidKeyword */:
+                case 43 /* PlusPlusToken */:
+                case 44 /* MinusMinusToken */:
+                case 27 /* LessThanToken */:
+                case 121 /* AwaitKeyword */:
+                case 116 /* YieldKeyword */:
+                    // Yield/await always starts an expression.  Either it is an identifier (in which case
+                    // it is definitely an expression).  Or it's a keyword (either because we're in
+                    // a generator or async function, or in strict mode (or both)) and it started a yield or await expression.
                     return true;
                 default:
+                    // Error tolerance.  If we see the start of some binary operator, we consider
+                    // that the start of an expression.  That way we'll parse out a missing identifier,
+                    // give a good message about an identifier being missing, and then consume the
+                    // rest of the binary expression.
                     if (isBinaryOperator()) {
                         return true;
                     }
@@ -15452,52 +17846,114 @@ var ts;
             }
         }
         function isStartOfExpressionStatement() {
-            return token() !== 17 &&
-                token() !== 89 &&
-                token() !== 75 &&
-                token() !== 57 &&
+            // As per the grammar, none of '{' or 'function' or 'class' can start an expression statement.
+            return token() !== 17 /* OpenBraceToken */ &&
+                token() !== 89 /* FunctionKeyword */ &&
+                token() !== 75 /* ClassKeyword */ &&
+                token() !== 57 /* AtToken */ &&
                 isStartOfExpression();
         }
         function parseExpression() {
+            // Expression[in]:
+            //      AssignmentExpression[in]
+            //      Expression[in] , AssignmentExpression[in]
+            // clear the decorator context when parsing Expression, as it should be unambiguous when parsing a decorator
             var saveDecoratorContext = inDecoratorContext();
             if (saveDecoratorContext) {
-                setDecoratorContext(false);
+                setDecoratorContext(/*val*/ false);
             }
             var expr = parseAssignmentExpressionOrHigher();
             var operatorToken;
-            while ((operatorToken = parseOptionalToken(26))) {
+            while ((operatorToken = parseOptionalToken(26 /* CommaToken */))) {
                 expr = makeBinaryExpression(expr, operatorToken, parseAssignmentExpressionOrHigher());
             }
             if (saveDecoratorContext) {
-                setDecoratorContext(true);
+                setDecoratorContext(/*val*/ true);
             }
             return expr;
         }
         function parseInitializer() {
-            return parseOptional(58) ? parseAssignmentExpressionOrHigher() : undefined;
+            return parseOptional(58 /* EqualsToken */) ? parseAssignmentExpressionOrHigher() : undefined;
         }
         function parseAssignmentExpressionOrHigher() {
+            //  AssignmentExpression[in,yield]:
+            //      1) ConditionalExpression[?in,?yield]
+            //      2) LeftHandSideExpression = AssignmentExpression[?in,?yield]
+            //      3) LeftHandSideExpression AssignmentOperator AssignmentExpression[?in,?yield]
+            //      4) ArrowFunctionExpression[?in,?yield]
+            //      5) AsyncArrowFunctionExpression[in,yield,await]
+            //      6) [+Yield] YieldExpression[?In]
+            //
+            // Note: for ease of implementation we treat productions '2' and '3' as the same thing.
+            // (i.e. they're both BinaryExpressions with an assignment operator in it).
+            // First, do the simple check if we have a YieldExpression (production '6').
             if (isYieldExpression()) {
                 return parseYieldExpression();
             }
+            // Then, check if we have an arrow function (production '4' and '5') that starts with a parenthesized
+            // parameter list or is an async arrow function.
+            // AsyncArrowFunctionExpression:
+            //      1) async[no LineTerminator here]AsyncArrowBindingIdentifier[?Yield][no LineTerminator here]=>AsyncConciseBody[?In]
+            //      2) CoverCallExpressionAndAsyncArrowHead[?Yield, ?Await][no LineTerminator here]=>AsyncConciseBody[?In]
+            // Production (1) of AsyncArrowFunctionExpression is parsed in "tryParseAsyncSimpleArrowFunctionExpression".
+            // And production (2) is parsed in "tryParseParenthesizedArrowFunctionExpression".
+            //
+            // If we do successfully parse arrow-function, we must *not* recurse for productions 1, 2 or 3. An ArrowFunction is
+            // not a LeftHandSideExpression, nor does it start a ConditionalExpression.  So we are done
+            // with AssignmentExpression if we see one.
             var arrowExpression = tryParseParenthesizedArrowFunctionExpression() || tryParseAsyncSimpleArrowFunctionExpression();
             if (arrowExpression) {
                 return arrowExpression;
             }
-            var expr = parseBinaryExpressionOrHigher(0);
-            if (expr.kind === 71 && token() === 36) {
+            // Now try to see if we're in production '1', '2' or '3'.  A conditional expression can
+            // start with a LogicalOrExpression, while the assignment productions can only start with
+            // LeftHandSideExpressions.
+            //
+            // So, first, we try to just parse out a BinaryExpression.  If we get something that is a
+            // LeftHandSide or higher, then we can try to parse out the assignment expression part.
+            // Otherwise, we try to parse out the conditional expression bit.  We want to allow any
+            // binary expression here, so we pass in the 'lowest' precedence here so that it matches
+            // and consumes anything.
+            var expr = parseBinaryExpressionOrHigher(/*precedence*/ 0);
+            // To avoid a look-ahead, we did not handle the case of an arrow function with a single un-parenthesized
+            // parameter ('x => ...') above. We handle it here by checking if the parsed expression was a single
+            // identifier and the current token is an arrow.
+            if (expr.kind === 71 /* Identifier */ && token() === 36 /* EqualsGreaterThanToken */) {
                 return parseSimpleArrowFunctionExpression(expr);
             }
+            // Now see if we might be in cases '2' or '3'.
+            // If the expression was a LHS expression, and we have an assignment operator, then
+            // we're in '2' or '3'. Consume the assignment and return.
+            //
+            // Note: we call reScanGreaterToken so that we get an appropriately merged token
+            // for cases like `> > =` becoming `>>=`
             if (ts.isLeftHandSideExpression(expr) && ts.isAssignmentOperator(reScanGreaterToken())) {
                 return makeBinaryExpression(expr, parseTokenNode(), parseAssignmentExpressionOrHigher());
             }
+            // It wasn't an assignment or a lambda.  This is a conditional expression:
             return parseConditionalExpressionRest(expr);
         }
         function isYieldExpression() {
-            if (token() === 116) {
+            if (token() === 116 /* YieldKeyword */) {
+                // If we have a 'yield' keyword, and this is a context where yield expressions are
+                // allowed, then definitely parse out a yield expression.
                 if (inYieldContext()) {
                     return true;
                 }
+                // We're in a context where 'yield expr' is not allowed.  However, if we can
+                // definitely tell that the user was trying to parse a 'yield expr' and not
+                // just a normal expr that start with a 'yield' identifier, then parse out
+                // a 'yield expr'.  We can then report an error later that they are only
+                // allowed in generator expressions.
+                //
+                // for example, if we see 'yield(foo)', then we'll have to treat that as an
+                // invocation expression of something called 'yield'.  However, if we have
+                // 'yield foo' then that is not legal as a normal expression, so we can
+                // definitely recognize this as a yield expression.
+                //
+                // for now we just check if the next token is an identifier.  More heuristics
+                // can be added here later as necessary.  We just need to make sure that we
+                // don't accidentally consume something legal.
                 return lookAhead(nextTokenIsIdentifierOrKeywordOrLiteralOnSameLine);
             }
             return false;
@@ -15507,216 +17963,302 @@ var ts;
             return !scanner.hasPrecedingLineBreak() && isIdentifier();
         }
         function parseYieldExpression() {
-            var node = createNode(203);
+            var node = createNode(203 /* YieldExpression */);
+            // YieldExpression[In] :
+            //      yield
+            //      yield [no LineTerminator here] [Lexical goal InputElementRegExp]AssignmentExpression[?In, Yield]
+            //      yield [no LineTerminator here] * [Lexical goal InputElementRegExp]AssignmentExpression[?In, Yield]
             nextToken();
             if (!scanner.hasPrecedingLineBreak() &&
-                (token() === 39 || isStartOfExpression())) {
-                node.asteriskToken = parseOptionalToken(39);
+                (token() === 39 /* AsteriskToken */ || isStartOfExpression())) {
+                node.asteriskToken = parseOptionalToken(39 /* AsteriskToken */);
                 node.expression = parseAssignmentExpressionOrHigher();
                 return finishNode(node);
             }
             else {
+                // if the next token is not on the same line as yield.  or we don't have an '*' or
+                // the start of an expression, then this is just a simple "yield" expression.
                 return finishNode(node);
             }
         }
         function parseSimpleArrowFunctionExpression(identifier, asyncModifier) {
-            ts.Debug.assert(token() === 36, "parseSimpleArrowFunctionExpression should only have been called if we had a =>");
+            ts.Debug.assert(token() === 36 /* EqualsGreaterThanToken */, "parseSimpleArrowFunctionExpression should only have been called if we had a =>");
             var node;
             if (asyncModifier) {
-                node = createNode(193, asyncModifier.pos);
+                node = createNode(193 /* ArrowFunction */, asyncModifier.pos);
                 node.modifiers = asyncModifier;
             }
             else {
-                node = createNode(193, identifier.pos);
+                node = createNode(193 /* ArrowFunction */, identifier.pos);
             }
-            var parameter = createNode(149, identifier.pos);
+            var parameter = createNode(149 /* Parameter */, identifier.pos);
             parameter.name = identifier;
             finishNode(parameter);
             node.parameters = createNodeArray([parameter], parameter.pos, parameter.end);
-            node.equalsGreaterThanToken = parseExpectedToken(36);
-            node.body = parseArrowFunctionExpressionBody(!!asyncModifier);
+            node.equalsGreaterThanToken = parseExpectedToken(36 /* EqualsGreaterThanToken */);
+            node.body = parseArrowFunctionExpressionBody(/*isAsync*/ !!asyncModifier);
             return addJSDocComment(finishNode(node));
         }
         function tryParseParenthesizedArrowFunctionExpression() {
             var triState = isParenthesizedArrowFunctionExpression();
-            if (triState === 0) {
+            if (triState === 0 /* False */) {
+                // It's definitely not a parenthesized arrow function expression.
                 return undefined;
             }
-            var arrowFunction = triState === 1
-                ? parseParenthesizedArrowFunctionExpressionHead(true)
+            // If we definitely have an arrow function, then we can just parse one, not requiring a
+            // following => or { token. Otherwise, we *might* have an arrow function.  Try to parse
+            // it out, but don't allow any ambiguity, and return 'undefined' if this could be an
+            // expression instead.
+            var arrowFunction = triState === 1 /* True */
+                ? parseParenthesizedArrowFunctionExpressionHead(/*allowAmbiguity*/ true)
                 : tryParse(parsePossibleParenthesizedArrowFunctionExpressionHead);
             if (!arrowFunction) {
+                // Didn't appear to actually be a parenthesized arrow function.  Just bail out.
                 return undefined;
             }
-            var isAsync = ts.hasModifier(arrowFunction, 256);
+            var isAsync = ts.hasModifier(arrowFunction, 256 /* Async */);
+            // If we have an arrow, then try to parse the body. Even if not, try to parse if we
+            // have an opening brace, just in case we're in an error state.
             var lastToken = token();
-            arrowFunction.equalsGreaterThanToken = parseExpectedToken(36);
-            arrowFunction.body = (lastToken === 36 || lastToken === 17)
+            arrowFunction.equalsGreaterThanToken = parseExpectedToken(36 /* EqualsGreaterThanToken */);
+            arrowFunction.body = (lastToken === 36 /* EqualsGreaterThanToken */ || lastToken === 17 /* OpenBraceToken */)
                 ? parseArrowFunctionExpressionBody(isAsync)
                 : parseIdentifier();
             return finishNode(arrowFunction);
         }
+        //  True        -> We definitely expect a parenthesized arrow function here.
+        //  False       -> There *cannot* be a parenthesized arrow function here.
+        //  Unknown     -> There *might* be a parenthesized arrow function here.
+        //                 Speculatively look ahead to be sure, and rollback if not.
         function isParenthesizedArrowFunctionExpression() {
-            if (token() === 19 || token() === 27 || token() === 120) {
+            if (token() === 19 /* OpenParenToken */ || token() === 27 /* LessThanToken */ || token() === 120 /* AsyncKeyword */) {
                 return lookAhead(isParenthesizedArrowFunctionExpressionWorker);
             }
-            if (token() === 36) {
-                return 1;
+            if (token() === 36 /* EqualsGreaterThanToken */) {
+                // ERROR RECOVERY TWEAK:
+                // If we see a standalone => try to parse it as an arrow function expression as that's
+                // likely what the user intended to write.
+                return 1 /* True */;
             }
-            return 0;
+            // Definitely not a parenthesized arrow function.
+            return 0 /* False */;
         }
         function isParenthesizedArrowFunctionExpressionWorker() {
-            if (token() === 120) {
+            if (token() === 120 /* AsyncKeyword */) {
                 nextToken();
                 if (scanner.hasPrecedingLineBreak()) {
-                    return 0;
+                    return 0 /* False */;
                 }
-                if (token() !== 19 && token() !== 27) {
-                    return 0;
+                if (token() !== 19 /* OpenParenToken */ && token() !== 27 /* LessThanToken */) {
+                    return 0 /* False */;
                 }
             }
             var first = token();
             var second = nextToken();
-            if (first === 19) {
-                if (second === 20) {
+            if (first === 19 /* OpenParenToken */) {
+                if (second === 20 /* CloseParenToken */) {
+                    // Simple cases: "() =>", "(): ", and "() {".
+                    // This is an arrow function with no parameters.
+                    // The last one is not actually an arrow function,
+                    // but this is probably what the user intended.
                     var third = nextToken();
                     switch (third) {
-                        case 36:
-                        case 56:
-                        case 17:
-                            return 1;
+                        case 36 /* EqualsGreaterThanToken */:
+                        case 56 /* ColonToken */:
+                        case 17 /* OpenBraceToken */:
+                            return 1 /* True */;
                         default:
-                            return 0;
+                            return 0 /* False */;
                     }
                 }
-                if (second === 21 || second === 17) {
-                    return 2;
+                // If encounter "([" or "({", this could be the start of a binding pattern.
+                // Examples:
+                //      ([ x ]) => { }
+                //      ({ x }) => { }
+                //      ([ x ])
+                //      ({ x })
+                if (second === 21 /* OpenBracketToken */ || second === 17 /* OpenBraceToken */) {
+                    return 2 /* Unknown */;
                 }
-                if (second === 24) {
-                    return 1;
+                // Simple case: "(..."
+                // This is an arrow function with a rest parameter.
+                if (second === 24 /* DotDotDotToken */) {
+                    return 1 /* True */;
                 }
-                if (ts.isModifierKind(second) && second !== 120 && lookAhead(nextTokenIsIdentifier)) {
-                    return 1;
+                // Check for "(xxx yyy", where xxx is a modifier and yyy is an identifier. This
+                // isn't actually allowed, but we want to treat it as a lambda so we can provide
+                // a good error message.
+                if (ts.isModifierKind(second) && second !== 120 /* AsyncKeyword */ && lookAhead(nextTokenIsIdentifier)) {
+                    return 1 /* True */;
                 }
+                // If we had "(" followed by something that's not an identifier,
+                // then this definitely doesn't look like a lambda.
                 if (!isIdentifier()) {
-                    return 0;
+                    return 0 /* False */;
                 }
                 switch (nextToken()) {
-                    case 56:
-                        return 1;
-                    case 55:
+                    case 56 /* ColonToken */:
+                        // If we have something like "(a:", then we must have a
+                        // type-annotated parameter in an arrow function expression.
+                        return 1 /* True */;
+                    case 55 /* QuestionToken */:
                         nextToken();
-                        if (token() === 56 || token() === 26 || token() === 58 || token() === 20) {
-                            return 1;
+                        // If we have "(a?:" or "(a?," or "(a?=" or "(a?)" then it is definitely a lambda.
+                        if (token() === 56 /* ColonToken */ || token() === 26 /* CommaToken */ || token() === 58 /* EqualsToken */ || token() === 20 /* CloseParenToken */) {
+                            return 1 /* True */;
                         }
-                        return 0;
-                    case 26:
-                    case 58:
-                    case 20:
-                        return 2;
+                        // Otherwise it is definitely not a lambda.
+                        return 0 /* False */;
+                    case 26 /* CommaToken */:
+                    case 58 /* EqualsToken */:
+                    case 20 /* CloseParenToken */:
+                        // If we have "(a," or "(a=" or "(a)" this *could* be an arrow function
+                        return 2 /* Unknown */;
                 }
-                return 0;
+                // It is definitely not an arrow function
+                return 0 /* False */;
             }
             else {
-                ts.Debug.assert(first === 27);
+                ts.Debug.assert(first === 27 /* LessThanToken */);
+                // If we have "<" not followed by an identifier,
+                // then this definitely is not an arrow function.
                 if (!isIdentifier()) {
-                    return 0;
+                    return 0 /* False */;
                 }
-                if (sourceFile.languageVariant === 1) {
+                // JSX overrides
+                if (sourceFile.languageVariant === 1 /* JSX */) {
                     var isArrowFunctionInJsx = lookAhead(function () {
                         var third = nextToken();
-                        if (third === 85) {
+                        if (third === 85 /* ExtendsKeyword */) {
                             var fourth = nextToken();
                             switch (fourth) {
-                                case 58:
-                                case 29:
+                                case 58 /* EqualsToken */:
+                                case 29 /* GreaterThanToken */:
                                     return false;
                                 default:
                                     return true;
                             }
                         }
-                        else if (third === 26) {
+                        else if (third === 26 /* CommaToken */) {
                             return true;
                         }
                         return false;
                     });
                     if (isArrowFunctionInJsx) {
-                        return 1;
+                        return 1 /* True */;
                     }
-                    return 0;
+                    return 0 /* False */;
                 }
-                return 2;
+                // This *could* be a parenthesized arrow function.
+                return 2 /* Unknown */;
             }
         }
         function parsePossibleParenthesizedArrowFunctionExpressionHead() {
-            return parseParenthesizedArrowFunctionExpressionHead(false);
+            return parseParenthesizedArrowFunctionExpressionHead(/*allowAmbiguity*/ false);
         }
         function tryParseAsyncSimpleArrowFunctionExpression() {
-            if (token() === 120) {
-                if (lookAhead(isUnParenthesizedAsyncArrowFunctionWorker) === 1) {
+            // We do a check here so that we won't be doing unnecessarily call to "lookAhead"
+            if (token() === 120 /* AsyncKeyword */) {
+                if (lookAhead(isUnParenthesizedAsyncArrowFunctionWorker) === 1 /* True */) {
                     var asyncModifier = parseModifiersForArrowFunction();
-                    var expr = parseBinaryExpressionOrHigher(0);
+                    var expr = parseBinaryExpressionOrHigher(/*precedence*/ 0);
                     return parseSimpleArrowFunctionExpression(expr, asyncModifier);
                 }
             }
             return undefined;
         }
         function isUnParenthesizedAsyncArrowFunctionWorker() {
-            if (token() === 120) {
+            // AsyncArrowFunctionExpression:
+            //      1) async[no LineTerminator here]AsyncArrowBindingIdentifier[?Yield][no LineTerminator here]=>AsyncConciseBody[?In]
+            //      2) CoverCallExpressionAndAsyncArrowHead[?Yield, ?Await][no LineTerminator here]=>AsyncConciseBody[?In]
+            if (token() === 120 /* AsyncKeyword */) {
                 nextToken();
-                if (scanner.hasPrecedingLineBreak() || token() === 36) {
-                    return 0;
+                // If the "async" is followed by "=>" token then it is not a beginning of an async arrow-function
+                // but instead a simple arrow-function which will be parsed inside "parseAssignmentExpressionOrHigher"
+                if (scanner.hasPrecedingLineBreak() || token() === 36 /* EqualsGreaterThanToken */) {
+                    return 0 /* False */;
                 }
-                var expr = parseBinaryExpressionOrHigher(0);
-                if (!scanner.hasPrecedingLineBreak() && expr.kind === 71 && token() === 36) {
-                    return 1;
+                // Check for un-parenthesized AsyncArrowFunction
+                var expr = parseBinaryExpressionOrHigher(/*precedence*/ 0);
+                if (!scanner.hasPrecedingLineBreak() && expr.kind === 71 /* Identifier */ && token() === 36 /* EqualsGreaterThanToken */) {
+                    return 1 /* True */;
                 }
             }
-            return 0;
+            return 0 /* False */;
         }
         function parseParenthesizedArrowFunctionExpressionHead(allowAmbiguity) {
-            var node = createNodeWithJSDoc(193);
+            var node = createNodeWithJSDoc(193 /* ArrowFunction */);
             node.modifiers = parseModifiersForArrowFunction();
-            var isAsync = ts.hasModifier(node, 256) ? 2 : 0;
-            if (!fillSignature(56, isAsync | (allowAmbiguity ? 0 : 8), node)) {
+            var isAsync = ts.hasModifier(node, 256 /* Async */) ? 2 /* Await */ : 0 /* None */;
+            // Arrow functions are never generators.
+            //
+            // If we're speculatively parsing a signature for a parenthesized arrow function, then
+            // we have to have a complete parameter list.  Otherwise we might see something like
+            // a => (b => c)
+            // And think that "(b =>" was actually a parenthesized arrow function with a missing
+            // close paren.
+            if (!fillSignature(56 /* ColonToken */, isAsync, node) && !allowAmbiguity) {
                 return undefined;
             }
-            if (!node.parameters) {
-                return undefined;
-            }
-            if (!allowAmbiguity && token() !== 36 && token() !== 17) {
+            // Parsing a signature isn't enough.
+            // Parenthesized arrow signatures often look like other valid expressions.
+            // For instance:
+            //  - "(x = 10)" is an assignment expression parsed as a signature with a default parameter value.
+            //  - "(x,y)" is a comma expression parsed as a signature with two parameters.
+            //  - "a ? (b): c" will have "(b):" parsed as a signature with a return type annotation.
+            //
+            // So we need just a bit of lookahead to ensure that it can only be a signature.
+            if (!allowAmbiguity && token() !== 36 /* EqualsGreaterThanToken */ && token() !== 17 /* OpenBraceToken */) {
+                // Returning undefined here will cause our caller to rewind to where we started from.
                 return undefined;
             }
             return node;
         }
         function parseArrowFunctionExpressionBody(isAsync) {
-            if (token() === 17) {
-                return parseFunctionBlock(isAsync ? 2 : 0);
+            if (token() === 17 /* OpenBraceToken */) {
+                return parseFunctionBlock(isAsync ? 2 /* Await */ : 0 /* None */);
             }
-            if (token() !== 25 &&
-                token() !== 89 &&
-                token() !== 75 &&
+            if (token() !== 25 /* SemicolonToken */ &&
+                token() !== 89 /* FunctionKeyword */ &&
+                token() !== 75 /* ClassKeyword */ &&
                 isStartOfStatement() &&
                 !isStartOfExpressionStatement()) {
-                return parseFunctionBlock(16 | (isAsync ? 2 : 0));
+                // Check if we got a plain statement (i.e. no expression-statements, no function/class expressions/declarations)
+                //
+                // Here we try to recover from a potential error situation in the case where the
+                // user meant to supply a block. For example, if the user wrote:
+                //
+                //  a =>
+                //      let v = 0;
+                //  }
+                //
+                // they may be missing an open brace.  Check to see if that's the case so we can
+                // try to recover better.  If we don't do this, then the next close curly we see may end
+                // up preemptively closing the containing construct.
+                //
+                // Note: even when 'IgnoreMissingOpenBrace' is passed, parseBody will still error.
+                return parseFunctionBlock(16 /* IgnoreMissingOpenBrace */ | (isAsync ? 2 /* Await */ : 0 /* None */));
             }
             return isAsync
                 ? doInAwaitContext(parseAssignmentExpressionOrHigher)
                 : doOutsideOfAwaitContext(parseAssignmentExpressionOrHigher);
         }
         function parseConditionalExpressionRest(leftOperand) {
-            var questionToken = parseOptionalToken(55);
+            // Note: we are passed in an expression which was produced from parseBinaryExpressionOrHigher.
+            var questionToken = parseOptionalToken(55 /* QuestionToken */);
             if (!questionToken) {
                 return leftOperand;
             }
-            var node = createNode(201, leftOperand.pos);
+            // Note: we explicitly 'allowIn' in the whenTrue part of the condition expression, and
+            // we do not that for the 'whenFalse' part.
+            var node = createNode(201 /* ConditionalExpression */, leftOperand.pos);
             node.condition = leftOperand;
             node.questionToken = questionToken;
             node.whenTrue = doOutsideOfContext(disallowInAndDecoratorContext, parseAssignmentExpressionOrHigher);
-            node.colonToken = parseExpectedToken(56);
+            node.colonToken = parseExpectedToken(56 /* ColonToken */);
             node.whenFalse = ts.nodeIsPresent(node.colonToken)
                 ? parseAssignmentExpressionOrHigher()
-                : createMissingNode(71, false, ts.Diagnostics._0_expected, ts.tokenToString(56));
+                : createMissingNode(71 /* Identifier */, /*reportAtCurrentPosition*/ false, ts.Diagnostics._0_expected, ts.tokenToString(56 /* ColonToken */));
             return finishNode(node);
         }
         function parseBinaryExpressionOrHigher(precedence) {
@@ -15724,22 +18266,50 @@ var ts;
             return parseBinaryExpressionRest(precedence, leftOperand);
         }
         function isInOrOfKeyword(t) {
-            return t === 92 || t === 145;
+            return t === 92 /* InKeyword */ || t === 145 /* OfKeyword */;
         }
         function parseBinaryExpressionRest(precedence, leftOperand) {
             while (true) {
+                // We either have a binary operator here, or we're finished.  We call
+                // reScanGreaterToken so that we merge token sequences like > and = into >=
                 reScanGreaterToken();
                 var newPrecedence = ts.getBinaryOperatorPrecedence(token());
-                var consumeCurrentOperator = token() === 40 ?
+                // Check the precedence to see if we should "take" this operator
+                // - For left associative operator (all operator but **), consume the operator,
+                //   recursively call the function below, and parse binaryExpression as a rightOperand
+                //   of the caller if the new precedence of the operator is greater then or equal to the current precedence.
+                //   For example:
+                //      a - b - c;
+                //            ^token; leftOperand = b. Return b to the caller as a rightOperand
+                //      a * b - c
+                //            ^token; leftOperand = b. Return b to the caller as a rightOperand
+                //      a - b * c;
+                //            ^token; leftOperand = b. Return b * c to the caller as a rightOperand
+                // - For right associative operator (**), consume the operator, recursively call the function
+                //   and parse binaryExpression as a rightOperand of the caller if the new precedence of
+                //   the operator is strictly grater than the current precedence
+                //   For example:
+                //      a ** b ** c;
+                //             ^^token; leftOperand = b. Return b ** c to the caller as a rightOperand
+                //      a - b ** c;
+                //            ^^token; leftOperand = b. Return b ** c to the caller as a rightOperand
+                //      a ** b - c
+                //             ^token; leftOperand = b. Return b to the caller as a rightOperand
+                var consumeCurrentOperator = token() === 40 /* AsteriskAsteriskToken */ ?
                     newPrecedence >= precedence :
                     newPrecedence > precedence;
                 if (!consumeCurrentOperator) {
                     break;
                 }
-                if (token() === 92 && inDisallowInContext()) {
+                if (token() === 92 /* InKeyword */ && inDisallowInContext()) {
                     break;
                 }
-                if (token() === 118) {
+                if (token() === 118 /* AsKeyword */) {
+                    // Make sure we *do* perform ASI for constructs like this:
+                    //    var x = foo
+                    //    as (Bar)
+                    // This should be parsed as an initialized variable, followed
+                    // by a function call to 'as' with the argument 'Bar'
                     if (scanner.hasPrecedingLineBreak()) {
                         break;
                     }
@@ -15755,77 +18325,105 @@ var ts;
             return leftOperand;
         }
         function isBinaryOperator() {
-            if (inDisallowInContext() && token() === 92) {
+            if (inDisallowInContext() && token() === 92 /* InKeyword */) {
                 return false;
             }
             return ts.getBinaryOperatorPrecedence(token()) > 0;
         }
         function makeBinaryExpression(left, operatorToken, right) {
-            var node = createNode(200, left.pos);
+            var node = createNode(200 /* BinaryExpression */, left.pos);
             node.left = left;
             node.operatorToken = operatorToken;
             node.right = right;
             return finishNode(node);
         }
         function makeAsExpression(left, right) {
-            var node = createNode(208, left.pos);
+            var node = createNode(208 /* AsExpression */, left.pos);
             node.expression = left;
             node.type = right;
             return finishNode(node);
         }
         function parsePrefixUnaryExpression() {
-            var node = createNode(198);
+            var node = createNode(198 /* PrefixUnaryExpression */);
             node.operator = token();
             nextToken();
             node.operand = parseSimpleUnaryExpression();
             return finishNode(node);
         }
         function parseDeleteExpression() {
-            var node = createNode(194);
+            var node = createNode(194 /* DeleteExpression */);
             nextToken();
             node.expression = parseSimpleUnaryExpression();
             return finishNode(node);
         }
         function parseTypeOfExpression() {
-            var node = createNode(195);
+            var node = createNode(195 /* TypeOfExpression */);
             nextToken();
             node.expression = parseSimpleUnaryExpression();
             return finishNode(node);
         }
         function parseVoidExpression() {
-            var node = createNode(196);
+            var node = createNode(196 /* VoidExpression */);
             nextToken();
             node.expression = parseSimpleUnaryExpression();
             return finishNode(node);
         }
         function isAwaitExpression() {
-            if (token() === 121) {
+            if (token() === 121 /* AwaitKeyword */) {
                 if (inAwaitContext()) {
                     return true;
                 }
+                // here we are using similar heuristics as 'isYieldExpression'
                 return lookAhead(nextTokenIsIdentifierOrKeywordOrLiteralOnSameLine);
             }
             return false;
         }
         function parseAwaitExpression() {
-            var node = createNode(197);
+            var node = createNode(197 /* AwaitExpression */);
             nextToken();
             node.expression = parseSimpleUnaryExpression();
             return finishNode(node);
         }
+        /**
+         * Parse ES7 exponential expression and await expression
+         *
+         * ES7 ExponentiationExpression:
+         *      1) UnaryExpression[?Yield]
+         *      2) UpdateExpression[?Yield] ** ExponentiationExpression[?Yield]
+         *
+         */
         function parseUnaryExpressionOrHigher() {
+            /**
+             * ES7 UpdateExpression:
+             *      1) LeftHandSideExpression[?Yield]
+             *      2) LeftHandSideExpression[?Yield][no LineTerminator here]++
+             *      3) LeftHandSideExpression[?Yield][no LineTerminator here]--
+             *      4) ++UnaryExpression[?Yield]
+             *      5) --UnaryExpression[?Yield]
+             */
             if (isUpdateExpression()) {
                 var updateExpression = parseUpdateExpression();
-                return token() === 40 ?
+                return token() === 40 /* AsteriskAsteriskToken */ ?
                     parseBinaryExpressionRest(ts.getBinaryOperatorPrecedence(token()), updateExpression) :
                     updateExpression;
             }
+            /**
+             * ES7 UnaryExpression:
+             *      1) UpdateExpression[?yield]
+             *      2) delete UpdateExpression[?yield]
+             *      3) void UpdateExpression[?yield]
+             *      4) typeof UpdateExpression[?yield]
+             *      5) + UpdateExpression[?yield]
+             *      6) - UpdateExpression[?yield]
+             *      7) ~ UpdateExpression[?yield]
+             *      8) ! UpdateExpression[?yield]
+             */
             var unaryOperator = token();
             var simpleUnaryExpression = parseSimpleUnaryExpression();
-            if (token() === 40) {
+            if (token() === 40 /* AsteriskAsteriskToken */) {
                 var pos = ts.skipTrivia(sourceText, simpleUnaryExpression.pos);
                 var end = simpleUnaryExpression.end;
-                if (simpleUnaryExpression.kind === 190) {
+                if (simpleUnaryExpression.kind === 190 /* TypeAssertionExpression */) {
                     parseErrorAt(pos, end, ts.Diagnostics.A_type_assertion_expression_is_not_allowed_in_the_left_hand_side_of_an_exponentiation_expression_Consider_enclosing_the_expression_in_parentheses);
                 }
                 else {
@@ -15834,63 +18432,108 @@ var ts;
             }
             return simpleUnaryExpression;
         }
+        /**
+         * Parse ES7 simple-unary expression or higher:
+         *
+         * ES7 UnaryExpression:
+         *      1) UpdateExpression[?yield]
+         *      2) delete UnaryExpression[?yield]
+         *      3) void UnaryExpression[?yield]
+         *      4) typeof UnaryExpression[?yield]
+         *      5) + UnaryExpression[?yield]
+         *      6) - UnaryExpression[?yield]
+         *      7) ~ UnaryExpression[?yield]
+         *      8) ! UnaryExpression[?yield]
+         *      9) [+Await] await UnaryExpression[?yield]
+         */
         function parseSimpleUnaryExpression() {
             switch (token()) {
-                case 37:
-                case 38:
-                case 52:
-                case 51:
+                case 37 /* PlusToken */:
+                case 38 /* MinusToken */:
+                case 52 /* TildeToken */:
+                case 51 /* ExclamationToken */:
                     return parsePrefixUnaryExpression();
-                case 80:
+                case 80 /* DeleteKeyword */:
                     return parseDeleteExpression();
-                case 103:
+                case 103 /* TypeOfKeyword */:
                     return parseTypeOfExpression();
-                case 105:
+                case 105 /* VoidKeyword */:
                     return parseVoidExpression();
-                case 27:
+                case 27 /* LessThanToken */:
+                    // This is modified UnaryExpression grammar in TypeScript
+                    //  UnaryExpression (modified):
+                    //      < type > UnaryExpression
                     return parseTypeAssertion();
-                case 121:
+                case 121 /* AwaitKeyword */:
                     if (isAwaitExpression()) {
                         return parseAwaitExpression();
                     }
+                // falls through
                 default:
                     return parseUpdateExpression();
             }
         }
+        /**
+         * Check if the current token can possibly be an ES7 increment expression.
+         *
+         * ES7 UpdateExpression:
+         *      LeftHandSideExpression[?Yield]
+         *      LeftHandSideExpression[?Yield][no LineTerminator here]++
+         *      LeftHandSideExpression[?Yield][no LineTerminator here]--
+         *      ++LeftHandSideExpression[?Yield]
+         *      --LeftHandSideExpression[?Yield]
+         */
         function isUpdateExpression() {
+            // This function is called inside parseUnaryExpression to decide
+            // whether to call parseSimpleUnaryExpression or call parseUpdateExpression directly
             switch (token()) {
-                case 37:
-                case 38:
-                case 52:
-                case 51:
-                case 80:
-                case 103:
-                case 105:
-                case 121:
+                case 37 /* PlusToken */:
+                case 38 /* MinusToken */:
+                case 52 /* TildeToken */:
+                case 51 /* ExclamationToken */:
+                case 80 /* DeleteKeyword */:
+                case 103 /* TypeOfKeyword */:
+                case 105 /* VoidKeyword */:
+                case 121 /* AwaitKeyword */:
                     return false;
-                case 27:
-                    if (sourceFile.languageVariant !== 1) {
+                case 27 /* LessThanToken */:
+                    // If we are not in JSX context, we are parsing TypeAssertion which is an UnaryExpression
+                    if (sourceFile.languageVariant !== 1 /* JSX */) {
                         return false;
                     }
+                // We are in JSX context and the token is part of JSXElement.
+                // falls through
                 default:
                     return true;
             }
         }
+        /**
+         * Parse ES7 UpdateExpression. UpdateExpression is used instead of ES6's PostFixExpression.
+         *
+         * ES7 UpdateExpression[yield]:
+         *      1) LeftHandSideExpression[?yield]
+         *      2) LeftHandSideExpression[?yield] [[no LineTerminator here]]++
+         *      3) LeftHandSideExpression[?yield] [[no LineTerminator here]]--
+         *      4) ++LeftHandSideExpression[?yield]
+         *      5) --LeftHandSideExpression[?yield]
+         * In TypeScript (2), (3) are parsed as PostfixUnaryExpression. (4), (5) are parsed as PrefixUnaryExpression
+         */
         function parseUpdateExpression() {
-            if (token() === 43 || token() === 44) {
-                var node = createNode(198);
+            if (token() === 43 /* PlusPlusToken */ || token() === 44 /* MinusMinusToken */) {
+                var node = createNode(198 /* PrefixUnaryExpression */);
                 node.operator = token();
                 nextToken();
                 node.operand = parseLeftHandSideExpressionOrHigher();
                 return finishNode(node);
             }
-            else if (sourceFile.languageVariant === 1 && token() === 27 && lookAhead(nextTokenIsIdentifierOrKeywordOrGreaterThan)) {
-                return parseJsxElementOrSelfClosingElementOrFragment(true);
+            else if (sourceFile.languageVariant === 1 /* JSX */ && token() === 27 /* LessThanToken */ && lookAhead(nextTokenIsIdentifierOrKeywordOrGreaterThan)) {
+                // JSXElement is part of primaryExpression
+                return parseJsxElementOrSelfClosingElementOrFragment(/*inExpressionContext*/ true);
             }
             var expression = parseLeftHandSideExpressionOrHigher();
             ts.Debug.assert(ts.isLeftHandSideExpression(expression));
-            if ((token() === 43 || token() === 44) && !scanner.hasPrecedingLineBreak()) {
-                var node = createNode(199, expression.pos);
+            if ((token() === 43 /* PlusPlusToken */ || token() === 44 /* MinusMinusToken */) && !scanner.hasPrecedingLineBreak()) {
+                var node = createNode(199 /* PostfixUnaryExpression */, expression.pos);
                 node.operand = expression;
                 node.operator = token();
                 nextToken();
@@ -15899,51 +18542,139 @@ var ts;
             return expression;
         }
         function parseLeftHandSideExpressionOrHigher() {
+            // Original Ecma:
+            // LeftHandSideExpression: See 11.2
+            //      NewExpression
+            //      CallExpression
+            //
+            // Our simplification:
+            //
+            // LeftHandSideExpression: See 11.2
+            //      MemberExpression
+            //      CallExpression
+            //
+            // See comment in parseMemberExpressionOrHigher on how we replaced NewExpression with
+            // MemberExpression to make our lives easier.
+            //
+            // to best understand the below code, it's important to see how CallExpression expands
+            // out into its own productions:
+            //
+            // CallExpression:
+            //      MemberExpression Arguments
+            //      CallExpression Arguments
+            //      CallExpression[Expression]
+            //      CallExpression.IdentifierName
+            //      import (AssignmentExpression)
+            //      super Arguments
+            //      super.IdentifierName
+            //
+            // Because of the recursion in these calls, we need to bottom out first. There are three
+            // bottom out states we can run into: 1) We see 'super' which must start either of
+            // the last two CallExpression productions. 2) We see 'import' which must start import call.
+            // 3)we have a MemberExpression which either completes the LeftHandSideExpression,
+            // or starts the beginning of the first four CallExpression productions.
             var expression;
-            if (token() === 91) {
+            if (token() === 91 /* ImportKeyword */) {
                 if (lookAhead(nextTokenIsOpenParenOrLessThan)) {
-                    sourceFile.flags |= 524288;
+                    // We don't want to eagerly consume all import keyword as import call expression so we look ahead to find "("
+                    // For example:
+                    //      var foo3 = require("subfolder
+                    //      import * as foo1 from "module-from-node
+                    // We want this import to be a statement rather than import call expression
+                    sourceFile.flags |= 524288 /* PossiblyContainsDynamicImport */;
                     expression = parseTokenNode();
                 }
                 else if (lookAhead(nextTokenIsDot)) {
+                    // This is an 'import.*' metaproperty (i.e. 'import.meta')
                     var fullStart = scanner.getStartPos();
-                    nextToken();
-                    nextToken();
-                    var node = createNode(210, fullStart);
-                    node.keywordToken = 91;
+                    nextToken(); // advance past the 'import'
+                    nextToken(); // advance past the dot
+                    var node = createNode(210 /* MetaProperty */, fullStart);
+                    node.keywordToken = 91 /* ImportKeyword */;
                     node.name = parseIdentifierName();
                     expression = finishNode(node);
-                    sourceFile.flags |= 1048576;
+                    sourceFile.flags |= 1048576 /* PossiblyContainsImportMeta */;
                 }
                 else {
                     expression = parseMemberExpressionOrHigher();
                 }
             }
             else {
-                expression = token() === 97 ? parseSuperExpression() : parseMemberExpressionOrHigher();
+                expression = token() === 97 /* SuperKeyword */ ? parseSuperExpression() : parseMemberExpressionOrHigher();
             }
+            // Now, we *may* be complete.  However, we might have consumed the start of a
+            // CallExpression.  As such, we need to consume the rest of it here to be complete.
             return parseCallExpressionRest(expression);
         }
         function parseMemberExpressionOrHigher() {
+            // Note: to make our lives simpler, we decompose the NewExpression productions and
+            // place ObjectCreationExpression and FunctionExpression into PrimaryExpression.
+            // like so:
+            //
+            //   PrimaryExpression : See 11.1
+            //      this
+            //      Identifier
+            //      Literal
+            //      ArrayLiteral
+            //      ObjectLiteral
+            //      (Expression)
+            //      FunctionExpression
+            //      new MemberExpression Arguments?
+            //
+            //   MemberExpression : See 11.2
+            //      PrimaryExpression
+            //      MemberExpression[Expression]
+            //      MemberExpression.IdentifierName
+            //
+            //   CallExpression : See 11.2
+            //      MemberExpression
+            //      CallExpression Arguments
+            //      CallExpression[Expression]
+            //      CallExpression.IdentifierName
+            //
+            // Technically this is ambiguous.  i.e. CallExpression defines:
+            //
+            //   CallExpression:
+            //      CallExpression Arguments
+            //
+            // If you see: "new Foo()"
+            //
+            // Then that could be treated as a single ObjectCreationExpression, or it could be
+            // treated as the invocation of "new Foo".  We disambiguate that in code (to match
+            // the original grammar) by making sure that if we see an ObjectCreationExpression
+            // we always consume arguments if they are there. So we treat "new Foo()" as an
+            // object creation only, and not at all as an invocation.  Another way to think
+            // about this is that for every "new" that we see, we will consume an argument list if
+            // it is there as part of the *associated* object creation node.  Any additional
+            // argument lists we see, will become invocation expressions.
+            //
+            // Because there are no other places in the grammar now that refer to FunctionExpression
+            // or ObjectCreationExpression, it is safe to push down into the PrimaryExpression
+            // production.
+            //
+            // Because CallExpression and MemberExpression are left recursive, we need to bottom out
+            // of the recursion immediately.  So we parse out a primary expression to start with.
             var expression = parsePrimaryExpression();
             return parseMemberExpressionRest(expression);
         }
         function parseSuperExpression() {
             var expression = parseTokenNode();
-            if (token() === 19 || token() === 23 || token() === 21) {
+            if (token() === 19 /* OpenParenToken */ || token() === 23 /* DotToken */ || token() === 21 /* OpenBracketToken */) {
                 return expression;
             }
-            var node = createNode(185, expression.pos);
+            // If we have seen "super" it must be followed by '(' or '.'.
+            // If it wasn't then just try to parse out a '.' and report an error.
+            var node = createNode(185 /* PropertyAccessExpression */, expression.pos);
             node.expression = expression;
-            parseExpectedToken(23, ts.Diagnostics.super_must_be_followed_by_an_argument_list_or_member_access);
-            node.name = parseRightSideOfDot(true);
+            parseExpectedToken(23 /* DotToken */, ts.Diagnostics.super_must_be_followed_by_an_argument_list_or_member_access);
+            node.name = parseRightSideOfDot(/*allowIdentifierNames*/ true);
             return finishNode(node);
         }
         function parseJsxElementOrSelfClosingElementOrFragment(inExpressionContext) {
             var opening = parseJsxOpeningOrSelfClosingElementOrOpeningFragment(inExpressionContext);
             var result;
-            if (opening.kind === 257) {
-                var node = createNode(255, opening.pos);
+            if (opening.kind === 257 /* JsxOpeningElement */) {
+                var node = createNode(255 /* JsxElement */, opening.pos);
                 node.openingElement = opening;
                 node.children = parseJsxChildren(node.openingElement);
                 node.closingElement = parseJsxClosingElement(inExpressionContext);
@@ -15952,26 +18683,34 @@ var ts;
                 }
                 result = finishNode(node);
             }
-            else if (opening.kind === 260) {
-                var node = createNode(259, opening.pos);
+            else if (opening.kind === 260 /* JsxOpeningFragment */) {
+                var node = createNode(259 /* JsxFragment */, opening.pos);
                 node.openingFragment = opening;
                 node.children = parseJsxChildren(node.openingFragment);
                 node.closingFragment = parseJsxClosingFragment(inExpressionContext);
                 result = finishNode(node);
             }
             else {
-                ts.Debug.assert(opening.kind === 256);
+                ts.Debug.assert(opening.kind === 256 /* JsxSelfClosingElement */);
+                // Nothing else to do for self-closing elements
                 result = opening;
             }
-            if (inExpressionContext && token() === 27) {
-                var invalidElement = tryParse(function () { return parseJsxElementOrSelfClosingElementOrFragment(true); });
+            // If the user writes the invalid code '<div></div><div></div>' in an expression context (i.e. not wrapped in
+            // an enclosing tag), we'll naively try to parse   ^ this as a 'less than' operator and the remainder of the tag
+            // as garbage, which will cause the formatter to badly mangle the JSX. Perform a speculative parse of a JSX
+            // element if we see a < token so that we can wrap it in a synthetic binary expression so the formatter
+            // does less damage and we can report a better error.
+            // Since JSX elements are invalid < operands anyway, this lookahead parse will only occur in error scenarios
+            // of one sort or another.
+            if (inExpressionContext && token() === 27 /* LessThanToken */) {
+                var invalidElement = tryParse(function () { return parseJsxElementOrSelfClosingElementOrFragment(/*inExpressionContext*/ true); });
                 if (invalidElement) {
                     parseErrorAtCurrentToken(ts.Diagnostics.JSX_expressions_must_have_one_parent_element);
-                    var badNode = createNode(200, result.pos);
+                    var badNode = createNode(200 /* BinaryExpression */, result.pos);
                     badNode.end = invalidElement.end;
                     badNode.left = result;
                     badNode.right = invalidElement;
-                    badNode.operatorToken = createMissingNode(26, false, undefined);
+                    badNode.operatorToken = createMissingNode(26 /* CommaToken */, /*reportAtCurrentPosition*/ false, /*diagnosticMessage*/ undefined); // TODO: GH#18217
                     badNode.operatorToken.pos = badNode.operatorToken.end = badNode.right.pos;
                     return badNode;
                 }
@@ -15979,14 +18718,16 @@ var ts;
             return result;
         }
         function parseJsxText() {
-            var node = createNode(10);
-            node.containsOnlyWhiteSpaces = currentToken === 11;
+            var node = createNode(10 /* JsxText */);
+            node.containsOnlyWhiteSpaces = currentToken === 11 /* JsxTextAllWhiteSpaces */;
             currentToken = scanner.scanJsxToken();
             return finishNode(node);
         }
         function parseJsxChild(openingTag, token) {
             switch (token) {
-                case 1:
+                case 1 /* EndOfFileToken */:
+                    // If we hit EOF, issue the error at the tag that lacks the closing element
+                    // rather than at the end of the file (which is useless)
                     if (ts.isJsxOpeningFragment(openingTag)) {
                         parseErrorAtRange(openingTag, ts.Diagnostics.JSX_fragment_has_no_corresponding_closing_tag);
                     }
@@ -15994,16 +18735,16 @@ var ts;
                         parseErrorAtRange(openingTag.tagName, ts.Diagnostics.JSX_element_0_has_no_corresponding_closing_tag, ts.getTextOfNodeFromSourceText(sourceText, openingTag.tagName));
                     }
                     return undefined;
-                case 28:
-                case 7:
+                case 28 /* LessThanSlashToken */:
+                case 7 /* ConflictMarkerTrivia */:
                     return undefined;
-                case 10:
-                case 11:
+                case 10 /* JsxText */:
+                case 11 /* JsxTextAllWhiteSpaces */:
                     return parseJsxText();
-                case 17:
-                    return parseJsxExpression(false);
-                case 27:
-                    return parseJsxElementOrSelfClosingElementOrFragment(false);
+                case 17 /* OpenBraceToken */:
+                    return parseJsxExpression(/*inExpressionContext*/ false);
+                case 27 /* LessThanToken */:
+                    return parseJsxElementOrSelfClosingElementOrFragment(/*inExpressionContext*/ false);
                 default:
                     return ts.Debug.assertNever(token);
             }
@@ -16012,7 +18753,7 @@ var ts;
             var list = [];
             var listPos = getNodePos();
             var saveParsingContext = parsingContext;
-            parsingContext |= 1 << 14;
+            parsingContext |= 1 << 14 /* JsxChildren */;
             while (true) {
                 var child = parseJsxChild(openingTag, currentToken = scanner.reScanJsxToken());
                 if (!child)
@@ -16023,15 +18764,16 @@ var ts;
             return createNodeArray(list, listPos);
         }
         function parseJsxAttributes() {
-            var jsxAttributes = createNode(263);
-            jsxAttributes.properties = parseList(13, parseJsxAttribute);
+            var jsxAttributes = createNode(263 /* JsxAttributes */);
+            jsxAttributes.properties = parseList(13 /* JsxAttributes */, parseJsxAttribute);
             return finishNode(jsxAttributes);
         }
         function parseJsxOpeningOrSelfClosingElementOrOpeningFragment(inExpressionContext) {
             var fullStart = scanner.getStartPos();
-            parseExpected(27);
-            if (token() === 29) {
-                var node_1 = createNode(260, fullStart);
+            parseExpected(27 /* LessThanToken */);
+            if (token() === 29 /* GreaterThanToken */) {
+                // See below for explanation of scanJsxText
+                var node_1 = createNode(260 /* JsxOpeningFragment */, fullStart);
                 scanJsxText();
                 return finishNode(node_1);
             }
@@ -16039,20 +18781,23 @@ var ts;
             var typeArguments = tryParseTypeArguments();
             var attributes = parseJsxAttributes();
             var node;
-            if (token() === 29) {
-                node = createNode(257, fullStart);
+            if (token() === 29 /* GreaterThanToken */) {
+                // Closing tag, so scan the immediately-following text with the JSX scanning instead
+                // of regular scanning to avoid treating illegal characters (e.g. '#') as immediate
+                // scanning errors
+                node = createNode(257 /* JsxOpeningElement */, fullStart);
                 scanJsxText();
             }
             else {
-                parseExpected(41);
+                parseExpected(41 /* SlashToken */);
                 if (inExpressionContext) {
-                    parseExpected(29);
+                    parseExpected(29 /* GreaterThanToken */);
                 }
                 else {
-                    parseExpected(29, undefined, false);
+                    parseExpected(29 /* GreaterThanToken */, /*diagnostic*/ undefined, /*shouldAdvance*/ false);
                     scanJsxText();
                 }
-                node = createNode(256, fullStart);
+                node = createNode(256 /* JsxSelfClosingElement */, fullStart);
             }
             node.tagName = tagName;
             node.typeArguments = typeArguments;
@@ -16061,119 +18806,125 @@ var ts;
         }
         function parseJsxElementName() {
             scanJsxIdentifier();
-            var expression = token() === 99 ?
+            // JsxElement can have name in the form of
+            //      propertyAccessExpression
+            //      primaryExpression in the form of an identifier and "this" keyword
+            // We can't just simply use parseLeftHandSideExpressionOrHigher because then we will start consider class,function etc as a keyword
+            // We only want to consider "this" as a primaryExpression
+            var expression = token() === 99 /* ThisKeyword */ ?
                 parseTokenNode() : parseIdentifierName();
-            while (parseOptional(23)) {
-                var propertyAccess = createNode(185, expression.pos);
+            while (parseOptional(23 /* DotToken */)) {
+                var propertyAccess = createNode(185 /* PropertyAccessExpression */, expression.pos);
                 propertyAccess.expression = expression;
-                propertyAccess.name = parseRightSideOfDot(true);
+                propertyAccess.name = parseRightSideOfDot(/*allowIdentifierNames*/ true);
                 expression = finishNode(propertyAccess);
             }
             return expression;
         }
         function parseJsxExpression(inExpressionContext) {
-            var node = createNode(265);
-            if (!parseExpected(17)) {
+            var node = createNode(265 /* JsxExpression */);
+            if (!parseExpected(17 /* OpenBraceToken */)) {
                 return undefined;
             }
-            if (token() !== 18) {
-                node.dotDotDotToken = parseOptionalToken(24);
+            if (token() !== 18 /* CloseBraceToken */) {
+                node.dotDotDotToken = parseOptionalToken(24 /* DotDotDotToken */);
                 node.expression = parseAssignmentExpressionOrHigher();
             }
             if (inExpressionContext) {
-                parseExpected(18);
+                parseExpected(18 /* CloseBraceToken */);
             }
             else {
-                parseExpected(18, undefined, false);
+                parseExpected(18 /* CloseBraceToken */, /*message*/ undefined, /*shouldAdvance*/ false);
                 scanJsxText();
             }
             return finishNode(node);
         }
         function parseJsxAttribute() {
-            if (token() === 17) {
+            if (token() === 17 /* OpenBraceToken */) {
                 return parseJsxSpreadAttribute();
             }
             scanJsxIdentifier();
-            var node = createNode(262);
+            var node = createNode(262 /* JsxAttribute */);
             node.name = parseIdentifierName();
-            if (token() === 58) {
+            if (token() === 58 /* EqualsToken */) {
                 switch (scanJsxAttributeValue()) {
-                    case 9:
+                    case 9 /* StringLiteral */:
                         node.initializer = parseLiteralNode();
                         break;
                     default:
-                        node.initializer = parseJsxExpression(true);
+                        node.initializer = parseJsxExpression(/*inExpressionContext*/ true);
                         break;
                 }
             }
             return finishNode(node);
         }
         function parseJsxSpreadAttribute() {
-            var node = createNode(264);
-            parseExpected(17);
-            parseExpected(24);
+            var node = createNode(264 /* JsxSpreadAttribute */);
+            parseExpected(17 /* OpenBraceToken */);
+            parseExpected(24 /* DotDotDotToken */);
             node.expression = parseExpression();
-            parseExpected(18);
+            parseExpected(18 /* CloseBraceToken */);
             return finishNode(node);
         }
         function parseJsxClosingElement(inExpressionContext) {
-            var node = createNode(258);
-            parseExpected(28);
+            var node = createNode(258 /* JsxClosingElement */);
+            parseExpected(28 /* LessThanSlashToken */);
             node.tagName = parseJsxElementName();
             if (inExpressionContext) {
-                parseExpected(29);
+                parseExpected(29 /* GreaterThanToken */);
             }
             else {
-                parseExpected(29, undefined, false);
+                parseExpected(29 /* GreaterThanToken */, /*diagnostic*/ undefined, /*shouldAdvance*/ false);
                 scanJsxText();
             }
             return finishNode(node);
         }
         function parseJsxClosingFragment(inExpressionContext) {
-            var node = createNode(261);
-            parseExpected(28);
+            var node = createNode(261 /* JsxClosingFragment */);
+            parseExpected(28 /* LessThanSlashToken */);
             if (ts.tokenIsIdentifierOrKeyword(token())) {
                 parseErrorAtRange(parseJsxElementName(), ts.Diagnostics.Expected_corresponding_closing_tag_for_JSX_fragment);
             }
             if (inExpressionContext) {
-                parseExpected(29);
+                parseExpected(29 /* GreaterThanToken */);
             }
             else {
-                parseExpected(29, undefined, false);
+                parseExpected(29 /* GreaterThanToken */, /*diagnostic*/ undefined, /*shouldAdvance*/ false);
                 scanJsxText();
             }
             return finishNode(node);
         }
         function parseTypeAssertion() {
-            var node = createNode(190);
-            parseExpected(27);
+            var node = createNode(190 /* TypeAssertionExpression */);
+            parseExpected(27 /* LessThanToken */);
             node.type = parseType();
-            parseExpected(29);
+            parseExpected(29 /* GreaterThanToken */);
             node.expression = parseSimpleUnaryExpression();
             return finishNode(node);
         }
         function parseMemberExpressionRest(expression) {
             while (true) {
-                var dotToken = parseOptionalToken(23);
+                var dotToken = parseOptionalToken(23 /* DotToken */);
                 if (dotToken) {
-                    var propertyAccess = createNode(185, expression.pos);
+                    var propertyAccess = createNode(185 /* PropertyAccessExpression */, expression.pos);
                     propertyAccess.expression = expression;
-                    propertyAccess.name = parseRightSideOfDot(true);
+                    propertyAccess.name = parseRightSideOfDot(/*allowIdentifierNames*/ true);
                     expression = finishNode(propertyAccess);
                     continue;
                 }
-                if (token() === 51 && !scanner.hasPrecedingLineBreak()) {
+                if (token() === 51 /* ExclamationToken */ && !scanner.hasPrecedingLineBreak()) {
                     nextToken();
-                    var nonNullExpression = createNode(209, expression.pos);
+                    var nonNullExpression = createNode(209 /* NonNullExpression */, expression.pos);
                     nonNullExpression.expression = expression;
                     expression = finishNode(nonNullExpression);
                     continue;
                 }
-                if (!inDecoratorContext() && parseOptional(21)) {
-                    var indexedAccess = createNode(186, expression.pos);
+                // when in the [Decorator] context, we do not parse ElementAccess as it could be part of a ComputedPropertyName
+                if (!inDecoratorContext() && parseOptional(21 /* OpenBracketToken */)) {
+                    var indexedAccess = createNode(186 /* ElementAccessExpression */, expression.pos);
                     indexedAccess.expression = expression;
-                    if (token() === 22) {
-                        indexedAccess.argumentExpression = createMissingNode(71, true, ts.Diagnostics.An_element_access_expression_should_take_an_argument);
+                    if (token() === 22 /* CloseBracketToken */) {
+                        indexedAccess.argumentExpression = createMissingNode(71 /* Identifier */, /*reportAtCurrentPosition*/ true, ts.Diagnostics.An_element_access_expression_should_take_an_argument);
                     }
                     else {
                         var argument = allowInAnd(parseExpression);
@@ -16182,25 +18933,25 @@ var ts;
                         }
                         indexedAccess.argumentExpression = argument;
                     }
-                    parseExpected(22);
+                    parseExpected(22 /* CloseBracketToken */);
                     expression = finishNode(indexedAccess);
                     continue;
                 }
                 if (isTemplateStartOfTaggedTemplate()) {
-                    expression = parseTaggedTemplateRest(expression, undefined);
+                    expression = parseTaggedTemplateRest(expression, /*typeArguments*/ undefined);
                     continue;
                 }
                 return expression;
             }
         }
         function isTemplateStartOfTaggedTemplate() {
-            return token() === 13 || token() === 14;
+            return token() === 13 /* NoSubstitutionTemplateLiteral */ || token() === 14 /* TemplateHead */;
         }
         function parseTaggedTemplateRest(tag, typeArguments) {
-            var tagExpression = createNode(189, tag.pos);
+            var tagExpression = createNode(189 /* TaggedTemplateExpression */, tag.pos);
             tagExpression.tag = tag;
             tagExpression.typeArguments = typeArguments;
-            tagExpression.template = token() === 13
+            tagExpression.template = token() === 13 /* NoSubstitutionTemplateLiteral */
                 ? parseLiteralNode()
                 : parseTemplateExpression();
             return finishNode(tagExpression);
@@ -16208,7 +18959,11 @@ var ts;
         function parseCallExpressionRest(expression) {
             while (true) {
                 expression = parseMemberExpressionRest(expression);
-                if (token() === 27) {
+                if (token() === 27 /* LessThanToken */) {
+                    // See if this is the start of a generic invocation.  If so, consume it and
+                    // keep checking for postfix expressions.  Otherwise, it's just a '<' that's
+                    // part of an arithmetic expression.  Break out so we consume it higher in the
+                    // stack.
                     var typeArguments = tryParse(parseTypeArgumentsInExpression);
                     if (!typeArguments) {
                         return expression;
@@ -16217,15 +18972,15 @@ var ts;
                         expression = parseTaggedTemplateRest(expression, typeArguments);
                         continue;
                     }
-                    var callExpr = createNode(187, expression.pos);
+                    var callExpr = createNode(187 /* CallExpression */, expression.pos);
                     callExpr.expression = expression;
                     callExpr.typeArguments = typeArguments;
                     callExpr.arguments = parseArgumentList();
                     expression = finishNode(callExpr);
                     continue;
                 }
-                else if (token() === 19) {
-                    var callExpr = createNode(187, expression.pos);
+                else if (token() === 19 /* OpenParenToken */) {
+                    var callExpr = createNode(187 /* CallExpression */, expression.pos);
                     callExpr.expression = expression;
                     callExpr.arguments = parseArgumentList();
                     expression = finishNode(callExpr);
@@ -16235,191 +18990,217 @@ var ts;
             }
         }
         function parseArgumentList() {
-            parseExpected(19);
-            var result = parseDelimitedList(11, parseArgumentExpression);
-            parseExpected(20);
+            parseExpected(19 /* OpenParenToken */);
+            var result = parseDelimitedList(11 /* ArgumentExpressions */, parseArgumentExpression);
+            parseExpected(20 /* CloseParenToken */);
             return result;
         }
         function parseTypeArgumentsInExpression() {
-            if (!parseOptional(27)) {
+            if (!parseOptional(27 /* LessThanToken */)) {
                 return undefined;
             }
-            var typeArguments = parseDelimitedList(19, parseType);
-            if (!parseExpected(29)) {
+            var typeArguments = parseDelimitedList(19 /* TypeArguments */, parseType);
+            if (!parseExpected(29 /* GreaterThanToken */)) {
+                // If it doesn't have the closing `>` then it's definitely not an type argument list.
                 return undefined;
             }
+            // If we have a '<', then only parse this as a argument list if the type arguments
+            // are complete and we have an open paren.  if we don't, rewind and return nothing.
             return typeArguments && canFollowTypeArgumentsInExpression()
                 ? typeArguments
                 : undefined;
         }
         function canFollowTypeArgumentsInExpression() {
             switch (token()) {
-                case 19:
-                case 13:
-                case 14:
-                case 23:
-                case 20:
-                case 22:
-                case 56:
-                case 25:
-                case 55:
-                case 32:
-                case 34:
-                case 33:
-                case 35:
-                case 53:
-                case 54:
-                case 50:
-                case 48:
-                case 49:
-                case 18:
-                case 1:
+                case 19 /* OpenParenToken */: // foo<x>(
+                case 13 /* NoSubstitutionTemplateLiteral */: // foo<T> `...`
+                case 14 /* TemplateHead */: // foo<T> `...${100}...`
+                // these are the only tokens can legally follow a type argument
+                // list. So we definitely want to treat them as type arg lists.
+                case 23 /* DotToken */: // foo<x>.
+                case 20 /* CloseParenToken */: // foo<x>)
+                case 22 /* CloseBracketToken */: // foo<x>]
+                case 56 /* ColonToken */: // foo<x>:
+                case 25 /* SemicolonToken */: // foo<x>;
+                case 55 /* QuestionToken */: // foo<x>?
+                case 32 /* EqualsEqualsToken */: // foo<x> ==
+                case 34 /* EqualsEqualsEqualsToken */: // foo<x> ===
+                case 33 /* ExclamationEqualsToken */: // foo<x> !=
+                case 35 /* ExclamationEqualsEqualsToken */: // foo<x> !==
+                case 53 /* AmpersandAmpersandToken */: // foo<x> &&
+                case 54 /* BarBarToken */: // foo<x> ||
+                case 50 /* CaretToken */: // foo<x> ^
+                case 48 /* AmpersandToken */: // foo<x> &
+                case 49 /* BarToken */: // foo<x> |
+                case 18 /* CloseBraceToken */: // foo<x> }
+                case 1 /* EndOfFileToken */: // foo<x>
+                    // these cases can't legally follow a type arg list.  However, they're not legal
+                    // expressions either.  The user is probably in the middle of a generic type. So
+                    // treat it as such.
                     return true;
-                case 26:
-                case 17:
+                case 26 /* CommaToken */: // foo<x>,
+                case 17 /* OpenBraceToken */: // foo<x> {
+                // We don't want to treat these as type arguments.  Otherwise we'll parse this
+                // as an invocation expression.  Instead, we want to parse out the expression
+                // in isolation from the type arguments.
                 default:
+                    // Anything else treat as an expression.
                     return false;
             }
         }
         function parsePrimaryExpression() {
             switch (token()) {
-                case 8:
-                case 9:
-                case 13:
+                case 8 /* NumericLiteral */:
+                case 9 /* StringLiteral */:
+                case 13 /* NoSubstitutionTemplateLiteral */:
                     return parseLiteralNode();
-                case 99:
-                case 97:
-                case 95:
-                case 101:
-                case 86:
+                case 99 /* ThisKeyword */:
+                case 97 /* SuperKeyword */:
+                case 95 /* NullKeyword */:
+                case 101 /* TrueKeyword */:
+                case 86 /* FalseKeyword */:
                     return parseTokenNode();
-                case 19:
+                case 19 /* OpenParenToken */:
                     return parseParenthesizedExpression();
-                case 21:
+                case 21 /* OpenBracketToken */:
                     return parseArrayLiteralExpression();
-                case 17:
+                case 17 /* OpenBraceToken */:
                     return parseObjectLiteralExpression();
-                case 120:
+                case 120 /* AsyncKeyword */:
+                    // Async arrow functions are parsed earlier in parseAssignmentExpressionOrHigher.
+                    // If we encounter `async [no LineTerminator here] function` then this is an async
+                    // function; otherwise, its an identifier.
                     if (!lookAhead(nextTokenIsFunctionKeywordOnSameLine)) {
                         break;
                     }
                     return parseFunctionExpression();
-                case 75:
+                case 75 /* ClassKeyword */:
                     return parseClassExpression();
-                case 89:
+                case 89 /* FunctionKeyword */:
                     return parseFunctionExpression();
-                case 94:
+                case 94 /* NewKeyword */:
                     return parseNewExpressionOrNewDotTarget();
-                case 41:
-                case 63:
-                    if (reScanSlashToken() === 12) {
+                case 41 /* SlashToken */:
+                case 63 /* SlashEqualsToken */:
+                    if (reScanSlashToken() === 12 /* RegularExpressionLiteral */) {
                         return parseLiteralNode();
                     }
                     break;
-                case 14:
+                case 14 /* TemplateHead */:
                     return parseTemplateExpression();
             }
             return parseIdentifier(ts.Diagnostics.Expression_expected);
         }
         function parseParenthesizedExpression() {
-            var node = createNodeWithJSDoc(191);
-            parseExpected(19);
+            var node = createNodeWithJSDoc(191 /* ParenthesizedExpression */);
+            parseExpected(19 /* OpenParenToken */);
             node.expression = allowInAnd(parseExpression);
-            parseExpected(20);
+            parseExpected(20 /* CloseParenToken */);
             return finishNode(node);
         }
         function parseSpreadElement() {
-            var node = createNode(204);
-            parseExpected(24);
+            var node = createNode(204 /* SpreadElement */);
+            parseExpected(24 /* DotDotDotToken */);
             node.expression = parseAssignmentExpressionOrHigher();
             return finishNode(node);
         }
         function parseArgumentOrArrayLiteralElement() {
-            return token() === 24 ? parseSpreadElement() :
-                token() === 26 ? createNode(206) :
+            return token() === 24 /* DotDotDotToken */ ? parseSpreadElement() :
+                token() === 26 /* CommaToken */ ? createNode(206 /* OmittedExpression */) :
                     parseAssignmentExpressionOrHigher();
         }
         function parseArgumentExpression() {
             return doOutsideOfContext(disallowInAndDecoratorContext, parseArgumentOrArrayLiteralElement);
         }
         function parseArrayLiteralExpression() {
-            var node = createNode(183);
-            parseExpected(21);
+            var node = createNode(183 /* ArrayLiteralExpression */);
+            parseExpected(21 /* OpenBracketToken */);
             if (scanner.hasPrecedingLineBreak()) {
                 node.multiLine = true;
             }
-            node.elements = parseDelimitedList(15, parseArgumentOrArrayLiteralElement);
-            parseExpected(22);
+            node.elements = parseDelimitedList(15 /* ArrayLiteralMembers */, parseArgumentOrArrayLiteralElement);
+            parseExpected(22 /* CloseBracketToken */);
             return finishNode(node);
         }
         function parseObjectLiteralElement() {
-            var node = createNodeWithJSDoc(0);
-            if (parseOptionalToken(24)) {
-                node.kind = 272;
+            var node = createNodeWithJSDoc(0 /* Unknown */);
+            if (parseOptionalToken(24 /* DotDotDotToken */)) {
+                node.kind = 272 /* SpreadAssignment */;
                 node.expression = parseAssignmentExpressionOrHigher();
                 return finishNode(node);
             }
             node.decorators = parseDecorators();
             node.modifiers = parseModifiers();
-            if (parseContextualModifier(125)) {
-                return parseAccessorDeclaration(node, 156);
+            if (parseContextualModifier(125 /* GetKeyword */)) {
+                return parseAccessorDeclaration(node, 156 /* GetAccessor */);
             }
-            if (parseContextualModifier(136)) {
-                return parseAccessorDeclaration(node, 157);
+            if (parseContextualModifier(136 /* SetKeyword */)) {
+                return parseAccessorDeclaration(node, 157 /* SetAccessor */);
             }
-            var asteriskToken = parseOptionalToken(39);
+            var asteriskToken = parseOptionalToken(39 /* AsteriskToken */);
             var tokenIsIdentifier = isIdentifier();
             node.name = parsePropertyName();
-            node.questionToken = parseOptionalToken(55);
-            if (asteriskToken || token() === 19 || token() === 27) {
+            // Disallowing of optional property assignments happens in the grammar checker.
+            node.questionToken = parseOptionalToken(55 /* QuestionToken */);
+            if (asteriskToken || token() === 19 /* OpenParenToken */ || token() === 27 /* LessThanToken */) {
                 return parseMethodDeclaration(node, asteriskToken);
             }
-            var isShorthandPropertyAssignment = tokenIsIdentifier && (token() === 26 || token() === 18 || token() === 58);
+            // check if it is short-hand property assignment or normal property assignment
+            // NOTE: if token is EqualsToken it is interpreted as CoverInitializedName production
+            // CoverInitializedName[Yield] :
+            //     IdentifierReference[?Yield] Initializer[In, ?Yield]
+            // this is necessary because ObjectLiteral productions are also used to cover grammar for ObjectAssignmentPattern
+            var isShorthandPropertyAssignment = tokenIsIdentifier && (token() === 26 /* CommaToken */ || token() === 18 /* CloseBraceToken */ || token() === 58 /* EqualsToken */);
             if (isShorthandPropertyAssignment) {
-                node.kind = 271;
-                var equalsToken = parseOptionalToken(58);
+                node.kind = 271 /* ShorthandPropertyAssignment */;
+                var equalsToken = parseOptionalToken(58 /* EqualsToken */);
                 if (equalsToken) {
                     node.equalsToken = equalsToken;
                     node.objectAssignmentInitializer = allowInAnd(parseAssignmentExpressionOrHigher);
                 }
             }
             else {
-                node.kind = 270;
-                parseExpected(56);
+                node.kind = 270 /* PropertyAssignment */;
+                parseExpected(56 /* ColonToken */);
                 node.initializer = allowInAnd(parseAssignmentExpressionOrHigher);
             }
             return finishNode(node);
         }
         function parseObjectLiteralExpression() {
-            var node = createNode(184);
-            parseExpected(17);
+            var node = createNode(184 /* ObjectLiteralExpression */);
+            parseExpected(17 /* OpenBraceToken */);
             if (scanner.hasPrecedingLineBreak()) {
                 node.multiLine = true;
             }
-            node.properties = parseDelimitedList(12, parseObjectLiteralElement, true);
-            parseExpected(18);
+            node.properties = parseDelimitedList(12 /* ObjectLiteralMembers */, parseObjectLiteralElement, /*considerSemicolonAsDelimiter*/ true);
+            parseExpected(18 /* CloseBraceToken */);
             return finishNode(node);
         }
         function parseFunctionExpression() {
+            // GeneratorExpression:
+            //      function* BindingIdentifier [Yield][opt](FormalParameters[Yield]){ GeneratorBody }
+            //
+            // FunctionExpression:
+            //      function BindingIdentifier[opt](FormalParameters){ FunctionBody }
             var saveDecoratorContext = inDecoratorContext();
             if (saveDecoratorContext) {
-                setDecoratorContext(false);
+                setDecoratorContext(/*val*/ false);
             }
-            var node = createNodeWithJSDoc(192);
+            var node = createNodeWithJSDoc(192 /* FunctionExpression */);
             node.modifiers = parseModifiers();
-            parseExpected(89);
-            node.asteriskToken = parseOptionalToken(39);
-            var isGenerator = node.asteriskToken ? 1 : 0;
-            var isAsync = ts.hasModifier(node, 256) ? 2 : 0;
+            parseExpected(89 /* FunctionKeyword */);
+            node.asteriskToken = parseOptionalToken(39 /* AsteriskToken */);
+            var isGenerator = node.asteriskToken ? 1 /* Yield */ : 0 /* None */;
+            var isAsync = ts.hasModifier(node, 256 /* Async */) ? 2 /* Await */ : 0 /* None */;
             node.name =
                 isGenerator && isAsync ? doInYieldAndAwaitContext(parseOptionalIdentifier) :
                     isGenerator ? doInYieldContext(parseOptionalIdentifier) :
                         isAsync ? doInAwaitContext(parseOptionalIdentifier) :
                             parseOptionalIdentifier();
-            fillSignature(56, isGenerator | isAsync, node);
+            fillSignature(56 /* ColonToken */, isGenerator | isAsync, node);
             node.body = parseFunctionBlock(isGenerator | isAsync);
             if (saveDecoratorContext) {
-                setDecoratorContext(true);
+                setDecoratorContext(/*val*/ true);
             }
             return finishNode(node);
         }
@@ -16428,10 +19209,10 @@ var ts;
         }
         function parseNewExpressionOrNewDotTarget() {
             var fullStart = scanner.getStartPos();
-            parseExpected(94);
-            if (parseOptional(23)) {
-                var node_2 = createNode(210, fullStart);
-                node_2.keywordToken = 94;
+            parseExpected(94 /* NewKeyword */);
+            if (parseOptional(23 /* DotToken */)) {
+                var node_2 = createNode(210 /* MetaProperty */, fullStart);
+                node_2.keywordToken = 94 /* NewKeyword */;
                 node_2.name = parseIdentifierName();
                 return finishNode(node_2);
             }
@@ -16447,22 +19228,23 @@ var ts;
                 }
                 break;
             }
-            var node = createNode(188, fullStart);
+            var node = createNode(188 /* NewExpression */, fullStart);
             node.expression = expression;
             node.typeArguments = typeArguments;
-            if (node.typeArguments || token() === 19) {
+            if (node.typeArguments || token() === 19 /* OpenParenToken */) {
                 node.arguments = parseArgumentList();
             }
             return finishNode(node);
         }
+        // STATEMENTS
         function parseBlock(ignoreMissingOpenBrace, diagnosticMessage) {
-            var node = createNode(213);
-            if (parseExpected(17, diagnosticMessage) || ignoreMissingOpenBrace) {
+            var node = createNode(213 /* Block */);
+            if (parseExpected(17 /* OpenBraceToken */, diagnosticMessage) || ignoreMissingOpenBrace) {
                 if (scanner.hasPrecedingLineBreak()) {
                     node.multiLine = true;
                 }
-                node.statements = parseList(1, parseStatement);
-                parseExpected(18);
+                node.statements = parseList(1 /* BlockStatements */, parseStatement);
+                parseExpected(18 /* CloseBraceToken */);
             }
             else {
                 node.statements = createMissingList();
@@ -16471,98 +19253,104 @@ var ts;
         }
         function parseFunctionBlock(flags, diagnosticMessage) {
             var savedYieldContext = inYieldContext();
-            setYieldContext(!!(flags & 1));
+            setYieldContext(!!(flags & 1 /* Yield */));
             var savedAwaitContext = inAwaitContext();
-            setAwaitContext(!!(flags & 2));
+            setAwaitContext(!!(flags & 2 /* Await */));
+            // We may be in a [Decorator] context when parsing a function expression or
+            // arrow function. The body of the function is not in [Decorator] context.
             var saveDecoratorContext = inDecoratorContext();
             if (saveDecoratorContext) {
-                setDecoratorContext(false);
+                setDecoratorContext(/*val*/ false);
             }
-            var block = parseBlock(!!(flags & 16), diagnosticMessage);
+            var block = parseBlock(!!(flags & 16 /* IgnoreMissingOpenBrace */), diagnosticMessage);
             if (saveDecoratorContext) {
-                setDecoratorContext(true);
+                setDecoratorContext(/*val*/ true);
             }
             setYieldContext(savedYieldContext);
             setAwaitContext(savedAwaitContext);
             return block;
         }
         function parseEmptyStatement() {
-            var node = createNode(215);
-            parseExpected(25);
+            var node = createNode(215 /* EmptyStatement */);
+            parseExpected(25 /* SemicolonToken */);
             return finishNode(node);
         }
         function parseIfStatement() {
-            var node = createNode(217);
-            parseExpected(90);
-            parseExpected(19);
+            var node = createNode(217 /* IfStatement */);
+            parseExpected(90 /* IfKeyword */);
+            parseExpected(19 /* OpenParenToken */);
             node.expression = allowInAnd(parseExpression);
-            parseExpected(20);
+            parseExpected(20 /* CloseParenToken */);
             node.thenStatement = parseStatement();
-            node.elseStatement = parseOptional(82) ? parseStatement() : undefined;
+            node.elseStatement = parseOptional(82 /* ElseKeyword */) ? parseStatement() : undefined;
             return finishNode(node);
         }
         function parseDoStatement() {
-            var node = createNode(218);
-            parseExpected(81);
+            var node = createNode(218 /* DoStatement */);
+            parseExpected(81 /* DoKeyword */);
             node.statement = parseStatement();
-            parseExpected(106);
-            parseExpected(19);
+            parseExpected(106 /* WhileKeyword */);
+            parseExpected(19 /* OpenParenToken */);
             node.expression = allowInAnd(parseExpression);
-            parseExpected(20);
-            parseOptional(25);
+            parseExpected(20 /* CloseParenToken */);
+            // From: https://mail.mozilla.org/pipermail/es-discuss/2011-August/016188.html
+            // 157 min --- All allen at wirfs-brock.com CONF --- "do{;}while(false)false" prohibited in
+            // spec but allowed in consensus reality. Approved -- this is the de-facto standard whereby
+            //  do;while(0)x will have a semicolon inserted before x.
+            parseOptional(25 /* SemicolonToken */);
             return finishNode(node);
         }
         function parseWhileStatement() {
-            var node = createNode(219);
-            parseExpected(106);
-            parseExpected(19);
+            var node = createNode(219 /* WhileStatement */);
+            parseExpected(106 /* WhileKeyword */);
+            parseExpected(19 /* OpenParenToken */);
             node.expression = allowInAnd(parseExpression);
-            parseExpected(20);
+            parseExpected(20 /* CloseParenToken */);
             node.statement = parseStatement();
             return finishNode(node);
         }
         function parseForOrForInOrForOfStatement() {
             var pos = getNodePos();
-            parseExpected(88);
-            var awaitToken = parseOptionalToken(121);
-            parseExpected(19);
+            parseExpected(88 /* ForKeyword */);
+            var awaitToken = parseOptionalToken(121 /* AwaitKeyword */);
+            parseExpected(19 /* OpenParenToken */);
             var initializer;
-            if (token() !== 25) {
-                if (token() === 104 || token() === 110 || token() === 76) {
-                    initializer = parseVariableDeclarationList(true);
+            if (token() !== 25 /* SemicolonToken */) {
+                if (token() === 104 /* VarKeyword */ || token() === 110 /* LetKeyword */ || token() === 76 /* ConstKeyword */) {
+                    initializer = parseVariableDeclarationList(/*inForStatementInitializer*/ true);
                 }
                 else {
                     initializer = disallowInAnd(parseExpression);
                 }
             }
             var forOrForInOrForOfStatement;
-            if (awaitToken ? parseExpected(145) : parseOptional(145)) {
-                var forOfStatement = createNode(222, pos);
+            if (awaitToken ? parseExpected(145 /* OfKeyword */) : parseOptional(145 /* OfKeyword */)) {
+                var forOfStatement = createNode(222 /* ForOfStatement */, pos);
                 forOfStatement.awaitModifier = awaitToken;
                 forOfStatement.initializer = initializer;
                 forOfStatement.expression = allowInAnd(parseAssignmentExpressionOrHigher);
-                parseExpected(20);
+                parseExpected(20 /* CloseParenToken */);
                 forOrForInOrForOfStatement = forOfStatement;
             }
-            else if (parseOptional(92)) {
-                var forInStatement = createNode(221, pos);
+            else if (parseOptional(92 /* InKeyword */)) {
+                var forInStatement = createNode(221 /* ForInStatement */, pos);
                 forInStatement.initializer = initializer;
                 forInStatement.expression = allowInAnd(parseExpression);
-                parseExpected(20);
+                parseExpected(20 /* CloseParenToken */);
                 forOrForInOrForOfStatement = forInStatement;
             }
             else {
-                var forStatement = createNode(220, pos);
+                var forStatement = createNode(220 /* ForStatement */, pos);
                 forStatement.initializer = initializer;
-                parseExpected(25);
-                if (token() !== 25 && token() !== 20) {
+                parseExpected(25 /* SemicolonToken */);
+                if (token() !== 25 /* SemicolonToken */ && token() !== 20 /* CloseParenToken */) {
                     forStatement.condition = allowInAnd(parseExpression);
                 }
-                parseExpected(25);
-                if (token() !== 20) {
+                parseExpected(25 /* SemicolonToken */);
+                if (token() !== 20 /* CloseParenToken */) {
                     forStatement.incrementor = allowInAnd(parseExpression);
                 }
-                parseExpected(20);
+                parseExpected(20 /* CloseParenToken */);
                 forOrForInOrForOfStatement = forStatement;
             }
             forOrForInOrForOfStatement.statement = parseStatement();
@@ -16570,7 +19358,7 @@ var ts;
         }
         function parseBreakOrContinueStatement(kind) {
             var node = createNode(kind);
-            parseExpected(kind === 224 ? 72 : 77);
+            parseExpected(kind === 224 /* BreakStatement */ ? 72 /* BreakKeyword */ : 77 /* ContinueKeyword */);
             if (!canParseSemicolon()) {
                 node.label = parseIdentifier();
             }
@@ -16578,8 +19366,8 @@ var ts;
             return finishNode(node);
         }
         function parseReturnStatement() {
-            var node = createNode(225);
-            parseExpected(96);
+            var node = createNode(225 /* ReturnStatement */);
+            parseExpected(96 /* ReturnKeyword */);
             if (!canParseSemicolon()) {
                 node.expression = allowInAnd(parseExpression);
             }
@@ -16587,92 +19375,106 @@ var ts;
             return finishNode(node);
         }
         function parseWithStatement() {
-            var node = createNode(226);
-            parseExpected(107);
-            parseExpected(19);
+            var node = createNode(226 /* WithStatement */);
+            parseExpected(107 /* WithKeyword */);
+            parseExpected(19 /* OpenParenToken */);
             node.expression = allowInAnd(parseExpression);
-            parseExpected(20);
-            node.statement = doInsideOfContext(8388608, parseStatement);
+            parseExpected(20 /* CloseParenToken */);
+            node.statement = doInsideOfContext(8388608 /* InWithStatement */, parseStatement);
             return finishNode(node);
         }
         function parseCaseClause() {
-            var node = createNode(266);
-            parseExpected(73);
+            var node = createNode(266 /* CaseClause */);
+            parseExpected(73 /* CaseKeyword */);
             node.expression = allowInAnd(parseExpression);
-            parseExpected(56);
-            node.statements = parseList(3, parseStatement);
+            parseExpected(56 /* ColonToken */);
+            node.statements = parseList(3 /* SwitchClauseStatements */, parseStatement);
             return finishNode(node);
         }
         function parseDefaultClause() {
-            var node = createNode(267);
-            parseExpected(79);
-            parseExpected(56);
-            node.statements = parseList(3, parseStatement);
+            var node = createNode(267 /* DefaultClause */);
+            parseExpected(79 /* DefaultKeyword */);
+            parseExpected(56 /* ColonToken */);
+            node.statements = parseList(3 /* SwitchClauseStatements */, parseStatement);
             return finishNode(node);
         }
         function parseCaseOrDefaultClause() {
-            return token() === 73 ? parseCaseClause() : parseDefaultClause();
+            return token() === 73 /* CaseKeyword */ ? parseCaseClause() : parseDefaultClause();
         }
         function parseSwitchStatement() {
-            var node = createNode(227);
-            parseExpected(98);
-            parseExpected(19);
+            var node = createNode(227 /* SwitchStatement */);
+            parseExpected(98 /* SwitchKeyword */);
+            parseExpected(19 /* OpenParenToken */);
             node.expression = allowInAnd(parseExpression);
-            parseExpected(20);
-            var caseBlock = createNode(241);
-            parseExpected(17);
-            caseBlock.clauses = parseList(2, parseCaseOrDefaultClause);
-            parseExpected(18);
+            parseExpected(20 /* CloseParenToken */);
+            var caseBlock = createNode(241 /* CaseBlock */);
+            parseExpected(17 /* OpenBraceToken */);
+            caseBlock.clauses = parseList(2 /* SwitchClauses */, parseCaseOrDefaultClause);
+            parseExpected(18 /* CloseBraceToken */);
             node.caseBlock = finishNode(caseBlock);
             return finishNode(node);
         }
         function parseThrowStatement() {
-            var node = createNode(229);
-            parseExpected(100);
+            // ThrowStatement[Yield] :
+            //      throw [no LineTerminator here]Expression[In, ?Yield];
+            // Because of automatic semicolon insertion, we need to report error if this
+            // throw could be terminated with a semicolon.  Note: we can't call 'parseExpression'
+            // directly as that might consume an expression on the following line.
+            // We just return 'undefined' in that case.  The actual error will be reported in the
+            // grammar walker.
+            var node = createNode(229 /* ThrowStatement */);
+            parseExpected(100 /* ThrowKeyword */);
             node.expression = scanner.hasPrecedingLineBreak() ? undefined : allowInAnd(parseExpression);
             parseSemicolon();
             return finishNode(node);
         }
+        // TODO: Review for error recovery
         function parseTryStatement() {
-            var node = createNode(230);
-            parseExpected(102);
-            node.tryBlock = parseBlock(false);
-            node.catchClause = token() === 74 ? parseCatchClause() : undefined;
-            if (!node.catchClause || token() === 87) {
-                parseExpected(87);
-                node.finallyBlock = parseBlock(false);
+            var node = createNode(230 /* TryStatement */);
+            parseExpected(102 /* TryKeyword */);
+            node.tryBlock = parseBlock(/*ignoreMissingOpenBrace*/ false);
+            node.catchClause = token() === 74 /* CatchKeyword */ ? parseCatchClause() : undefined;
+            // If we don't have a catch clause, then we must have a finally clause.  Try to parse
+            // one out no matter what.
+            if (!node.catchClause || token() === 87 /* FinallyKeyword */) {
+                parseExpected(87 /* FinallyKeyword */);
+                node.finallyBlock = parseBlock(/*ignoreMissingOpenBrace*/ false);
             }
             return finishNode(node);
         }
         function parseCatchClause() {
-            var result = createNode(269);
-            parseExpected(74);
-            if (parseOptional(19)) {
+            var result = createNode(269 /* CatchClause */);
+            parseExpected(74 /* CatchKeyword */);
+            if (parseOptional(19 /* OpenParenToken */)) {
                 result.variableDeclaration = parseVariableDeclaration();
-                parseExpected(20);
+                parseExpected(20 /* CloseParenToken */);
             }
             else {
+                // Keep shape of node to avoid degrading performance.
                 result.variableDeclaration = undefined;
             }
-            result.block = parseBlock(false);
+            result.block = parseBlock(/*ignoreMissingOpenBrace*/ false);
             return finishNode(result);
         }
         function parseDebuggerStatement() {
-            var node = createNode(231);
-            parseExpected(78);
+            var node = createNode(231 /* DebuggerStatement */);
+            parseExpected(78 /* DebuggerKeyword */);
             parseSemicolon();
             return finishNode(node);
         }
         function parseExpressionOrLabeledStatement() {
-            var node = createNodeWithJSDoc(0);
+            // Avoiding having to do the lookahead for a labeled statement by just trying to parse
+            // out an expression, seeing if it is identifier and then seeing if it is followed by
+            // a colon.
+            var node = createNodeWithJSDoc(0 /* Unknown */);
             var expression = allowInAnd(parseExpression);
-            if (expression.kind === 71 && parseOptional(56)) {
-                node.kind = 228;
+            if (expression.kind === 71 /* Identifier */ && parseOptional(56 /* ColonToken */)) {
+                node.kind = 228 /* LabeledStatement */;
                 node.label = expression;
                 node.statement = parseStatement();
             }
             else {
-                node.kind = 216;
+                node.kind = 216 /* ExpressionStatement */;
                 node.expression = expression;
                 parseSemicolon();
             }
@@ -16684,60 +19486,82 @@ var ts;
         }
         function nextTokenIsClassKeywordOnSameLine() {
             nextToken();
-            return token() === 75 && !scanner.hasPrecedingLineBreak();
+            return token() === 75 /* ClassKeyword */ && !scanner.hasPrecedingLineBreak();
         }
         function nextTokenIsFunctionKeywordOnSameLine() {
             nextToken();
-            return token() === 89 && !scanner.hasPrecedingLineBreak();
+            return token() === 89 /* FunctionKeyword */ && !scanner.hasPrecedingLineBreak();
         }
         function nextTokenIsIdentifierOrKeywordOrLiteralOnSameLine() {
             nextToken();
-            return (ts.tokenIsIdentifierOrKeyword(token()) || token() === 8 || token() === 9) && !scanner.hasPrecedingLineBreak();
+            return (ts.tokenIsIdentifierOrKeyword(token()) || token() === 8 /* NumericLiteral */ || token() === 9 /* StringLiteral */) && !scanner.hasPrecedingLineBreak();
         }
         function isDeclaration() {
             while (true) {
                 switch (token()) {
-                    case 104:
-                    case 110:
-                    case 76:
-                    case 89:
-                    case 75:
-                    case 83:
+                    case 104 /* VarKeyword */:
+                    case 110 /* LetKeyword */:
+                    case 76 /* ConstKeyword */:
+                    case 89 /* FunctionKeyword */:
+                    case 75 /* ClassKeyword */:
+                    case 83 /* EnumKeyword */:
                         return true;
-                    case 109:
-                    case 139:
+                    // 'declare', 'module', 'namespace', 'interface'* and 'type' are all legal JavaScript identifiers;
+                    // however, an identifier cannot be followed by another identifier on the same line. This is what we
+                    // count on to parse out the respective declarations. For instance, we exploit this to say that
+                    //
+                    //    namespace n
+                    //
+                    // can be none other than the beginning of a namespace declaration, but need to respect that JavaScript sees
+                    //
+                    //    namespace
+                    //    n
+                    //
+                    // as the identifier 'namespace' on one line followed by the identifier 'n' on another.
+                    // We need to look one token ahead to see if it permissible to try parsing a declaration.
+                    //
+                    // *Note*: 'interface' is actually a strict mode reserved word. So while
+                    //
+                    //   "use strict"
+                    //   interface
+                    //   I {}
+                    //
+                    // could be legal, it would add complexity for very little gain.
+                    case 109 /* InterfaceKeyword */:
+                    case 139 /* TypeKeyword */:
                         return nextTokenIsIdentifierOnSameLine();
-                    case 129:
-                    case 130:
+                    case 129 /* ModuleKeyword */:
+                    case 130 /* NamespaceKeyword */:
                         return nextTokenIsIdentifierOrStringLiteralOnSameLine();
-                    case 117:
-                    case 120:
-                    case 124:
-                    case 112:
-                    case 113:
-                    case 114:
-                    case 132:
+                    case 117 /* AbstractKeyword */:
+                    case 120 /* AsyncKeyword */:
+                    case 124 /* DeclareKeyword */:
+                    case 112 /* PrivateKeyword */:
+                    case 113 /* ProtectedKeyword */:
+                    case 114 /* PublicKeyword */:
+                    case 132 /* ReadonlyKeyword */:
                         nextToken();
+                        // ASI takes effect for this modifier.
                         if (scanner.hasPrecedingLineBreak()) {
                             return false;
                         }
                         continue;
-                    case 144:
+                    case 144 /* GlobalKeyword */:
                         nextToken();
-                        return token() === 17 || token() === 71 || token() === 84;
-                    case 91:
+                        return token() === 17 /* OpenBraceToken */ || token() === 71 /* Identifier */ || token() === 84 /* ExportKeyword */;
+                    case 91 /* ImportKeyword */:
                         nextToken();
-                        return token() === 9 || token() === 39 ||
-                            token() === 17 || ts.tokenIsIdentifierOrKeyword(token());
-                    case 84:
+                        return token() === 9 /* StringLiteral */ || token() === 39 /* AsteriskToken */ ||
+                            token() === 17 /* OpenBraceToken */ || ts.tokenIsIdentifierOrKeyword(token());
+                    case 84 /* ExportKeyword */:
                         nextToken();
-                        if (token() === 58 || token() === 39 ||
-                            token() === 17 || token() === 79 ||
-                            token() === 118) {
+                        if (token() === 58 /* EqualsToken */ || token() === 39 /* AsteriskToken */ ||
+                            token() === 17 /* OpenBraceToken */ || token() === 79 /* DefaultKeyword */ ||
+                            token() === 118 /* AsKeyword */) {
                             return true;
                         }
                         continue;
-                    case 115:
+                    case 115 /* StaticKeyword */:
                         nextToken();
                         continue;
                     default:
@@ -16750,47 +19574,52 @@ var ts;
         }
         function isStartOfStatement() {
             switch (token()) {
-                case 57:
-                case 25:
-                case 17:
-                case 104:
-                case 110:
-                case 89:
-                case 75:
-                case 83:
-                case 90:
-                case 81:
-                case 106:
-                case 88:
-                case 77:
-                case 72:
-                case 96:
-                case 107:
-                case 98:
-                case 100:
-                case 102:
-                case 78:
-                case 74:
-                case 87:
+                case 57 /* AtToken */:
+                case 25 /* SemicolonToken */:
+                case 17 /* OpenBraceToken */:
+                case 104 /* VarKeyword */:
+                case 110 /* LetKeyword */:
+                case 89 /* FunctionKeyword */:
+                case 75 /* ClassKeyword */:
+                case 83 /* EnumKeyword */:
+                case 90 /* IfKeyword */:
+                case 81 /* DoKeyword */:
+                case 106 /* WhileKeyword */:
+                case 88 /* ForKeyword */:
+                case 77 /* ContinueKeyword */:
+                case 72 /* BreakKeyword */:
+                case 96 /* ReturnKeyword */:
+                case 107 /* WithKeyword */:
+                case 98 /* SwitchKeyword */:
+                case 100 /* ThrowKeyword */:
+                case 102 /* TryKeyword */:
+                case 78 /* DebuggerKeyword */:
+                // 'catch' and 'finally' do not actually indicate that the code is part of a statement,
+                // however, we say they are here so that we may gracefully parse them and error later.
+                case 74 /* CatchKeyword */:
+                case 87 /* FinallyKeyword */:
                     return true;
-                case 91:
+                case 91 /* ImportKeyword */:
                     return isStartOfDeclaration() || lookAhead(nextTokenIsOpenParenOrLessThanOrDot);
-                case 76:
-                case 84:
+                case 76 /* ConstKeyword */:
+                case 84 /* ExportKeyword */:
                     return isStartOfDeclaration();
-                case 120:
-                case 124:
-                case 109:
-                case 129:
-                case 130:
-                case 139:
-                case 144:
+                case 120 /* AsyncKeyword */:
+                case 124 /* DeclareKeyword */:
+                case 109 /* InterfaceKeyword */:
+                case 129 /* ModuleKeyword */:
+                case 130 /* NamespaceKeyword */:
+                case 139 /* TypeKeyword */:
+                case 144 /* GlobalKeyword */:
+                    // When these don't start a declaration, they're an identifier in an expression statement
                     return true;
-                case 114:
-                case 112:
-                case 113:
-                case 115:
-                case 132:
+                case 114 /* PublicKeyword */:
+                case 112 /* PrivateKeyword */:
+                case 113 /* ProtectedKeyword */:
+                case 115 /* StaticKeyword */:
+                case 132 /* ReadonlyKeyword */:
+                    // When these don't start a declaration, they may be the start of a class member if an identifier
+                    // immediately follows. Otherwise they're an identifier in an expression statement.
                     return isStartOfDeclaration() || !lookAhead(nextTokenIsIdentifierOrKeywordOnSameLine);
                 default:
                     return isStartOfExpression();
@@ -16798,73 +19627,76 @@ var ts;
         }
         function nextTokenIsIdentifierOrStartOfDestructuring() {
             nextToken();
-            return isIdentifier() || token() === 17 || token() === 21;
+            return isIdentifier() || token() === 17 /* OpenBraceToken */ || token() === 21 /* OpenBracketToken */;
         }
         function isLetDeclaration() {
+            // In ES6 'let' always starts a lexical declaration if followed by an identifier or {
+            // or [.
             return lookAhead(nextTokenIsIdentifierOrStartOfDestructuring);
         }
         function parseStatement() {
             switch (token()) {
-                case 25:
+                case 25 /* SemicolonToken */:
                     return parseEmptyStatement();
-                case 17:
-                    return parseBlock(false);
-                case 104:
-                    return parseVariableStatement(createNodeWithJSDoc(232));
-                case 110:
+                case 17 /* OpenBraceToken */:
+                    return parseBlock(/*ignoreMissingOpenBrace*/ false);
+                case 104 /* VarKeyword */:
+                    return parseVariableStatement(createNodeWithJSDoc(232 /* VariableDeclaration */));
+                case 110 /* LetKeyword */:
                     if (isLetDeclaration()) {
-                        return parseVariableStatement(createNodeWithJSDoc(232));
+                        return parseVariableStatement(createNodeWithJSDoc(232 /* VariableDeclaration */));
                     }
                     break;
-                case 89:
-                    return parseFunctionDeclaration(createNodeWithJSDoc(234));
-                case 75:
-                    return parseClassDeclaration(createNodeWithJSDoc(235));
-                case 90:
+                case 89 /* FunctionKeyword */:
+                    return parseFunctionDeclaration(createNodeWithJSDoc(234 /* FunctionDeclaration */));
+                case 75 /* ClassKeyword */:
+                    return parseClassDeclaration(createNodeWithJSDoc(235 /* ClassDeclaration */));
+                case 90 /* IfKeyword */:
                     return parseIfStatement();
-                case 81:
+                case 81 /* DoKeyword */:
                     return parseDoStatement();
-                case 106:
+                case 106 /* WhileKeyword */:
                     return parseWhileStatement();
-                case 88:
+                case 88 /* ForKeyword */:
                     return parseForOrForInOrForOfStatement();
-                case 77:
-                    return parseBreakOrContinueStatement(223);
-                case 72:
-                    return parseBreakOrContinueStatement(224);
-                case 96:
+                case 77 /* ContinueKeyword */:
+                    return parseBreakOrContinueStatement(223 /* ContinueStatement */);
+                case 72 /* BreakKeyword */:
+                    return parseBreakOrContinueStatement(224 /* BreakStatement */);
+                case 96 /* ReturnKeyword */:
                     return parseReturnStatement();
-                case 107:
+                case 107 /* WithKeyword */:
                     return parseWithStatement();
-                case 98:
+                case 98 /* SwitchKeyword */:
                     return parseSwitchStatement();
-                case 100:
+                case 100 /* ThrowKeyword */:
                     return parseThrowStatement();
-                case 102:
-                case 74:
-                case 87:
+                case 102 /* TryKeyword */:
+                // Include 'catch' and 'finally' for error recovery.
+                case 74 /* CatchKeyword */:
+                case 87 /* FinallyKeyword */:
                     return parseTryStatement();
-                case 78:
+                case 78 /* DebuggerKeyword */:
                     return parseDebuggerStatement();
-                case 57:
+                case 57 /* AtToken */:
                     return parseDeclaration();
-                case 120:
-                case 109:
-                case 139:
-                case 129:
-                case 130:
-                case 124:
-                case 76:
-                case 83:
-                case 84:
-                case 91:
-                case 112:
-                case 113:
-                case 114:
-                case 117:
-                case 115:
-                case 132:
-                case 144:
+                case 120 /* AsyncKeyword */:
+                case 109 /* InterfaceKeyword */:
+                case 139 /* TypeKeyword */:
+                case 129 /* ModuleKeyword */:
+                case 130 /* NamespaceKeyword */:
+                case 124 /* DeclareKeyword */:
+                case 76 /* ConstKeyword */:
+                case 83 /* EnumKeyword */:
+                case 84 /* ExportKeyword */:
+                case 91 /* ImportKeyword */:
+                case 112 /* PrivateKeyword */:
+                case 113 /* ProtectedKeyword */:
+                case 114 /* PublicKeyword */:
+                case 117 /* AbstractKeyword */:
+                case 115 /* StaticKeyword */:
+                case 132 /* ReadonlyKeyword */:
+                case 144 /* GlobalKeyword */:
                     if (isStartOfDeclaration()) {
                         return parseDeclaration();
                     }
@@ -16873,18 +19705,18 @@ var ts;
             return parseExpressionOrLabeledStatement();
         }
         function isDeclareModifier(modifier) {
-            return modifier.kind === 124;
+            return modifier.kind === 124 /* DeclareKeyword */;
         }
         function parseDeclaration() {
-            var node = createNodeWithJSDoc(0);
+            var node = createNodeWithJSDoc(0 /* Unknown */);
             node.decorators = parseDecorators();
             node.modifiers = parseModifiers();
             if (ts.some(node.modifiers, isDeclareModifier)) {
                 for (var _i = 0, _a = node.modifiers; _i < _a.length; _i++) {
                     var m = _a[_i];
-                    m.flags |= 4194304;
+                    m.flags |= 4194304 /* Ambient */;
                 }
-                return doInsideOfContext(4194304, function () { return parseDeclarationWorker(node); });
+                return doInsideOfContext(4194304 /* Ambient */, function () { return parseDeclarationWorker(node); });
             }
             else {
                 return parseDeclarationWorker(node);
@@ -16892,79 +19724,82 @@ var ts;
         }
         function parseDeclarationWorker(node) {
             switch (token()) {
-                case 104:
-                case 110:
-                case 76:
+                case 104 /* VarKeyword */:
+                case 110 /* LetKeyword */:
+                case 76 /* ConstKeyword */:
                     return parseVariableStatement(node);
-                case 89:
+                case 89 /* FunctionKeyword */:
                     return parseFunctionDeclaration(node);
-                case 75:
+                case 75 /* ClassKeyword */:
                     return parseClassDeclaration(node);
-                case 109:
+                case 109 /* InterfaceKeyword */:
                     return parseInterfaceDeclaration(node);
-                case 139:
+                case 139 /* TypeKeyword */:
                     return parseTypeAliasDeclaration(node);
-                case 83:
+                case 83 /* EnumKeyword */:
                     return parseEnumDeclaration(node);
-                case 144:
-                case 129:
-                case 130:
+                case 144 /* GlobalKeyword */:
+                case 129 /* ModuleKeyword */:
+                case 130 /* NamespaceKeyword */:
                     return parseModuleDeclaration(node);
-                case 91:
+                case 91 /* ImportKeyword */:
                     return parseImportDeclarationOrImportEqualsDeclaration(node);
-                case 84:
+                case 84 /* ExportKeyword */:
                     nextToken();
                     switch (token()) {
-                        case 79:
-                        case 58:
+                        case 79 /* DefaultKeyword */:
+                        case 58 /* EqualsToken */:
                             return parseExportAssignment(node);
-                        case 118:
+                        case 118 /* AsKeyword */:
                             return parseNamespaceExportDeclaration(node);
                         default:
                             return parseExportDeclaration(node);
                     }
                 default:
                     if (node.decorators || node.modifiers) {
-                        var missing = createMissingNode(253, true, ts.Diagnostics.Declaration_expected);
+                        // We reached this point because we encountered decorators and/or modifiers and assumed a declaration
+                        // would follow. For recovery and error reporting purposes, return an incomplete declaration.
+                        var missing = createMissingNode(253 /* MissingDeclaration */, /*reportAtCurrentPosition*/ true, ts.Diagnostics.Declaration_expected);
                         missing.pos = node.pos;
                         missing.decorators = node.decorators;
                         missing.modifiers = node.modifiers;
                         return finishNode(missing);
                     }
-                    return undefined;
+                    return undefined; // TODO: GH#18217
             }
         }
         function nextTokenIsIdentifierOrStringLiteralOnSameLine() {
             nextToken();
-            return !scanner.hasPrecedingLineBreak() && (isIdentifier() || token() === 9);
+            return !scanner.hasPrecedingLineBreak() && (isIdentifier() || token() === 9 /* StringLiteral */);
         }
         function parseFunctionBlockOrSemicolon(flags, diagnosticMessage) {
-            if (token() !== 17 && canParseSemicolon()) {
+            if (token() !== 17 /* OpenBraceToken */ && canParseSemicolon()) {
                 parseSemicolon();
                 return;
             }
             return parseFunctionBlock(flags, diagnosticMessage);
         }
+        // DECLARATIONS
         function parseArrayBindingElement() {
-            if (token() === 26) {
-                return createNode(206);
+            if (token() === 26 /* CommaToken */) {
+                return createNode(206 /* OmittedExpression */);
             }
-            var node = createNode(182);
-            node.dotDotDotToken = parseOptionalToken(24);
+            var node = createNode(182 /* BindingElement */);
+            node.dotDotDotToken = parseOptionalToken(24 /* DotDotDotToken */);
             node.name = parseIdentifierOrPattern();
             node.initializer = parseInitializer();
             return finishNode(node);
         }
         function parseObjectBindingElement() {
-            var node = createNode(182);
-            node.dotDotDotToken = parseOptionalToken(24);
+            var node = createNode(182 /* BindingElement */);
+            node.dotDotDotToken = parseOptionalToken(24 /* DotDotDotToken */);
             var tokenIsIdentifier = isIdentifier();
             var propertyName = parsePropertyName();
-            if (tokenIsIdentifier && token() !== 56) {
+            if (tokenIsIdentifier && token() !== 56 /* ColonToken */) {
                 node.name = propertyName;
             }
             else {
-                parseExpected(56);
+                parseExpected(56 /* ColonToken */);
                 node.propertyName = propertyName;
                 node.name = parseIdentifierOrPattern();
             }
@@ -16972,39 +19807,39 @@ var ts;
             return finishNode(node);
         }
         function parseObjectBindingPattern() {
-            var node = createNode(180);
-            parseExpected(17);
-            node.elements = parseDelimitedList(9, parseObjectBindingElement);
-            parseExpected(18);
+            var node = createNode(180 /* ObjectBindingPattern */);
+            parseExpected(17 /* OpenBraceToken */);
+            node.elements = parseDelimitedList(9 /* ObjectBindingElements */, parseObjectBindingElement);
+            parseExpected(18 /* CloseBraceToken */);
             return finishNode(node);
         }
         function parseArrayBindingPattern() {
-            var node = createNode(181);
-            parseExpected(21);
-            node.elements = parseDelimitedList(10, parseArrayBindingElement);
-            parseExpected(22);
+            var node = createNode(181 /* ArrayBindingPattern */);
+            parseExpected(21 /* OpenBracketToken */);
+            node.elements = parseDelimitedList(10 /* ArrayBindingElements */, parseArrayBindingElement);
+            parseExpected(22 /* CloseBracketToken */);
             return finishNode(node);
         }
         function isIdentifierOrPattern() {
-            return token() === 17 || token() === 21 || isIdentifier();
+            return token() === 17 /* OpenBraceToken */ || token() === 21 /* OpenBracketToken */ || isIdentifier();
         }
         function parseIdentifierOrPattern() {
-            if (token() === 21) {
+            if (token() === 21 /* OpenBracketToken */) {
                 return parseArrayBindingPattern();
             }
-            if (token() === 17) {
+            if (token() === 17 /* OpenBraceToken */) {
                 return parseObjectBindingPattern();
             }
             return parseIdentifier();
         }
         function parseVariableDeclarationAllowExclamation() {
-            return parseVariableDeclaration(true);
+            return parseVariableDeclaration(/*allowExclamation*/ true);
         }
         function parseVariableDeclaration(allowExclamation) {
-            var node = createNode(232);
+            var node = createNode(232 /* VariableDeclaration */);
             node.name = parseIdentifierOrPattern();
-            if (allowExclamation && node.name.kind === 71 &&
-                token() === 51 && !scanner.hasPrecedingLineBreak()) {
+            if (allowExclamation && node.name.kind === 71 /* Identifier */ &&
+                token() === 51 /* ExclamationToken */ && !scanner.hasPrecedingLineBreak()) {
                 node.exclamationToken = parseTokenNode();
             }
             node.type = parseTypeAnnotation();
@@ -17014,84 +19849,104 @@ var ts;
             return finishNode(node);
         }
         function parseVariableDeclarationList(inForStatementInitializer) {
-            var node = createNode(233);
+            var node = createNode(233 /* VariableDeclarationList */);
             switch (token()) {
-                case 104:
+                case 104 /* VarKeyword */:
                     break;
-                case 110:
-                    node.flags |= 1;
+                case 110 /* LetKeyword */:
+                    node.flags |= 1 /* Let */;
                     break;
-                case 76:
-                    node.flags |= 2;
+                case 76 /* ConstKeyword */:
+                    node.flags |= 2 /* Const */;
                     break;
                 default:
                     ts.Debug.fail();
             }
             nextToken();
-            if (token() === 145 && lookAhead(canFollowContextualOfKeyword)) {
+            // The user may have written the following:
+            //
+            //    for (let of X) { }
+            //
+            // In this case, we want to parse an empty declaration list, and then parse 'of'
+            // as a keyword. The reason this is not automatic is that 'of' is a valid identifier.
+            // So we need to look ahead to determine if 'of' should be treated as a keyword in
+            // this context.
+            // The checker will then give an error that there is an empty declaration list.
+            if (token() === 145 /* OfKeyword */ && lookAhead(canFollowContextualOfKeyword)) {
                 node.declarations = createMissingList();
             }
             else {
                 var savedDisallowIn = inDisallowInContext();
                 setDisallowInContext(inForStatementInitializer);
-                node.declarations = parseDelimitedList(8, inForStatementInitializer ? parseVariableDeclaration : parseVariableDeclarationAllowExclamation);
+                node.declarations = parseDelimitedList(8 /* VariableDeclarations */, inForStatementInitializer ? parseVariableDeclaration : parseVariableDeclarationAllowExclamation);
                 setDisallowInContext(savedDisallowIn);
             }
             return finishNode(node);
         }
         function canFollowContextualOfKeyword() {
-            return nextTokenIsIdentifier() && nextToken() === 20;
+            return nextTokenIsIdentifier() && nextToken() === 20 /* CloseParenToken */;
         }
         function parseVariableStatement(node) {
-            node.kind = 214;
-            node.declarationList = parseVariableDeclarationList(false);
+            node.kind = 214 /* VariableStatement */;
+            node.declarationList = parseVariableDeclarationList(/*inForStatementInitializer*/ false);
             parseSemicolon();
             return finishNode(node);
         }
         function parseFunctionDeclaration(node) {
-            node.kind = 234;
-            parseExpected(89);
-            node.asteriskToken = parseOptionalToken(39);
-            node.name = ts.hasModifier(node, 512) ? parseOptionalIdentifier() : parseIdentifier();
-            var isGenerator = node.asteriskToken ? 1 : 0;
-            var isAsync = ts.hasModifier(node, 256) ? 2 : 0;
-            fillSignature(56, isGenerator | isAsync, node);
+            node.kind = 234 /* FunctionDeclaration */;
+            parseExpected(89 /* FunctionKeyword */);
+            node.asteriskToken = parseOptionalToken(39 /* AsteriskToken */);
+            node.name = ts.hasModifier(node, 512 /* Default */) ? parseOptionalIdentifier() : parseIdentifier();
+            var isGenerator = node.asteriskToken ? 1 /* Yield */ : 0 /* None */;
+            var isAsync = ts.hasModifier(node, 256 /* Async */) ? 2 /* Await */ : 0 /* None */;
+            fillSignature(56 /* ColonToken */, isGenerator | isAsync, node);
             node.body = parseFunctionBlockOrSemicolon(isGenerator | isAsync, ts.Diagnostics.or_expected);
             return finishNode(node);
         }
         function parseConstructorDeclaration(node) {
-            node.kind = 155;
-            parseExpected(123);
-            fillSignature(56, 0, node);
-            node.body = parseFunctionBlockOrSemicolon(0, ts.Diagnostics.or_expected);
+            node.kind = 155 /* Constructor */;
+            parseExpected(123 /* ConstructorKeyword */);
+            fillSignature(56 /* ColonToken */, 0 /* None */, node);
+            node.body = parseFunctionBlockOrSemicolon(0 /* None */, ts.Diagnostics.or_expected);
             return finishNode(node);
         }
         function parseMethodDeclaration(node, asteriskToken, diagnosticMessage) {
-            node.kind = 154;
+            node.kind = 154 /* MethodDeclaration */;
             node.asteriskToken = asteriskToken;
-            var isGenerator = asteriskToken ? 1 : 0;
-            var isAsync = ts.hasModifier(node, 256) ? 2 : 0;
-            fillSignature(56, isGenerator | isAsync, node);
+            var isGenerator = asteriskToken ? 1 /* Yield */ : 0 /* None */;
+            var isAsync = ts.hasModifier(node, 256 /* Async */) ? 2 /* Await */ : 0 /* None */;
+            fillSignature(56 /* ColonToken */, isGenerator | isAsync, node);
             node.body = parseFunctionBlockOrSemicolon(isGenerator | isAsync, diagnosticMessage);
             return finishNode(node);
         }
         function parsePropertyDeclaration(node) {
-            node.kind = 152;
-            if (!node.questionToken && token() === 51 && !scanner.hasPrecedingLineBreak()) {
+            node.kind = 152 /* PropertyDeclaration */;
+            if (!node.questionToken && token() === 51 /* ExclamationToken */ && !scanner.hasPrecedingLineBreak()) {
                 node.exclamationToken = parseTokenNode();
             }
             node.type = parseTypeAnnotation();
-            node.initializer = ts.hasModifier(node, 32)
+            // For instance properties specifically, since they are evaluated inside the constructor,
+            // we do *not * want to parse yield expressions, so we specifically turn the yield context
+            // off. The grammar would look something like this:
+            //
+            //    MemberVariableDeclaration[Yield]:
+            //        AccessibilityModifier_opt PropertyName TypeAnnotation_opt Initializer_opt[In];
+            //        AccessibilityModifier_opt static_opt PropertyName TypeAnnotation_opt Initializer_opt[In, ?Yield];
+            //
+            // The checker may still error in the static case to explicitly disallow the yield expression.
+            node.initializer = ts.hasModifier(node, 32 /* Static */)
                 ? allowInAnd(parseInitializer)
-                : doOutsideOfContext(4096 | 2048, parseInitializer);
+                : doOutsideOfContext(4096 /* YieldContext */ | 2048 /* DisallowInContext */, parseInitializer);
             parseSemicolon();
             return finishNode(node);
         }
         function parsePropertyOrMethodDeclaration(node) {
-            var asteriskToken = parseOptionalToken(39);
+            var asteriskToken = parseOptionalToken(39 /* AsteriskToken */);
             node.name = parsePropertyName();
-            node.questionToken = parseOptionalToken(55);
-            if (asteriskToken || token() === 19 || token() === 27) {
+            // Note: this is not legal as per the grammar.  But we allow it in the parser and
+            // report an error in the grammar checker.
+            node.questionToken = parseOptionalToken(55 /* QuestionToken */);
+            if (asteriskToken || token() === 19 /* OpenParenToken */ || token() === 27 /* LessThanToken */) {
                 return parseMethodDeclaration(node, asteriskToken, ts.Diagnostics.or_expected);
             }
             return parsePropertyDeclaration(node);
@@ -17099,45 +19954,64 @@ var ts;
         function parseAccessorDeclaration(node, kind) {
             node.kind = kind;
             node.name = parsePropertyName();
-            fillSignature(56, 0, node);
-            node.body = parseFunctionBlockOrSemicolon(0);
+            fillSignature(56 /* ColonToken */, 0 /* None */, node);
+            node.body = parseFunctionBlockOrSemicolon(0 /* None */);
             return finishNode(node);
         }
         function isClassMemberStart() {
             var idToken;
-            if (token() === 57) {
+            if (token() === 57 /* AtToken */) {
                 return true;
             }
+            // Eat up all modifiers, but hold on to the last one in case it is actually an identifier.
             while (ts.isModifierKind(token())) {
                 idToken = token();
+                // If the idToken is a class modifier (protected, private, public, and static), it is
+                // certain that we are starting to parse class member. This allows better error recovery
+                // Example:
+                //      public foo() ...     // true
+                //      public @dec blah ... // true; we will then report an error later
+                //      export public ...    // true; we will then report an error later
                 if (ts.isClassMemberModifier(idToken)) {
                     return true;
                 }
                 nextToken();
             }
-            if (token() === 39) {
+            if (token() === 39 /* AsteriskToken */) {
                 return true;
             }
+            // Try to get the first property-like token following all modifiers.
+            // This can either be an identifier or the 'get' or 'set' keywords.
             if (isLiteralPropertyName()) {
                 idToken = token();
                 nextToken();
             }
-            if (token() === 21) {
+            // Index signatures and computed properties are class members; we can parse.
+            if (token() === 21 /* OpenBracketToken */) {
                 return true;
             }
+            // If we were able to get any potential identifier...
             if (idToken !== undefined) {
-                if (!ts.isKeyword(idToken) || idToken === 136 || idToken === 125) {
+                // If we have a non-keyword identifier, or if we have an accessor, then it's safe to parse.
+                if (!ts.isKeyword(idToken) || idToken === 136 /* SetKeyword */ || idToken === 125 /* GetKeyword */) {
                     return true;
                 }
+                // If it *is* a keyword, but not an accessor, check a little farther along
+                // to see if it should actually be parsed as a class member.
                 switch (token()) {
-                    case 19:
-                    case 27:
-                    case 51:
-                    case 56:
-                    case 58:
-                    case 55:
+                    case 19 /* OpenParenToken */: // Method declaration
+                    case 27 /* LessThanToken */: // Generic Method declaration
+                    case 51 /* ExclamationToken */: // Non-null assertion on property name
+                    case 56 /* ColonToken */: // Type Annotation for declaration
+                    case 58 /* EqualsToken */: // Initializer for declaration
+                    case 55 /* QuestionToken */: // Not valid, but permitted so that it gets caught later on.
                         return true;
                     default:
+                        // Covers
+                        //  - Semicolons     (declaration termination)
+                        //  - Closing braces (end-of-class, must be declaration)
+                        //  - End-of-files   (not valid, but permitted so that it gets caught later on)
+                        //  - Line-breaks    (enabling *automatic semicolon insertion*)
                         return canParseSemicolon();
                 }
             }
@@ -17148,23 +20022,32 @@ var ts;
             var listPos = getNodePos();
             while (true) {
                 var decoratorStart = getNodePos();
-                if (!parseOptional(57)) {
+                if (!parseOptional(57 /* AtToken */)) {
                     break;
                 }
-                var decorator = createNode(150, decoratorStart);
+                var decorator = createNode(150 /* Decorator */, decoratorStart);
                 decorator.expression = doInDecoratorContext(parseLeftHandSideExpressionOrHigher);
                 finishNode(decorator);
                 (list || (list = [])).push(decorator);
             }
             return list && createNodeArray(list, listPos);
         }
+        /*
+         * There are situations in which a modifier like 'const' will appear unexpectedly, such as on a class member.
+         * In those situations, if we are entirely sure that 'const' is not valid on its own (such as when ASI takes effect
+         * and turns it into a standalone declaration), then it is better to parse it and report an error later.
+         *
+         * In such situations, 'permitInvalidConstAsModifier' should be set to true.
+         */
         function parseModifiers(permitInvalidConstAsModifier) {
             var list;
             var listPos = getNodePos();
             while (true) {
                 var modifierStart = scanner.getStartPos();
                 var modifierKind = token();
-                if (token() === 76 && permitInvalidConstAsModifier) {
+                if (token() === 76 /* ConstKeyword */ && permitInvalidConstAsModifier) {
+                    // We need to ensure that any subsequent modifiers appear on the same line
+                    // so that when 'const' is a standalone declaration, we don't issue an error.
                     if (!tryParse(nextTokenIsOnSameLineAndCanFollowModifier)) {
                         break;
                     }
@@ -17181,7 +20064,7 @@ var ts;
         }
         function parseModifiersForArrowFunction() {
             var modifiers;
-            if (token() === 120) {
+            if (token() === 120 /* AsyncKeyword */) {
                 var modifierStart = scanner.getStartPos();
                 var modifierKind = token();
                 nextToken();
@@ -17191,54 +20074,60 @@ var ts;
             return modifiers;
         }
         function parseClassElement() {
-            if (token() === 25) {
-                var result = createNode(212);
+            if (token() === 25 /* SemicolonToken */) {
+                var result = createNode(212 /* SemicolonClassElement */);
                 nextToken();
                 return finishNode(result);
             }
-            var node = createNodeWithJSDoc(0);
+            var node = createNodeWithJSDoc(0 /* Unknown */);
             node.decorators = parseDecorators();
-            node.modifiers = parseModifiers(true);
-            if (parseContextualModifier(125)) {
-                return parseAccessorDeclaration(node, 156);
+            node.modifiers = parseModifiers(/*permitInvalidConstAsModifier*/ true);
+            if (parseContextualModifier(125 /* GetKeyword */)) {
+                return parseAccessorDeclaration(node, 156 /* GetAccessor */);
             }
-            if (parseContextualModifier(136)) {
-                return parseAccessorDeclaration(node, 157);
+            if (parseContextualModifier(136 /* SetKeyword */)) {
+                return parseAccessorDeclaration(node, 157 /* SetAccessor */);
             }
-            if (token() === 123) {
+            if (token() === 123 /* ConstructorKeyword */) {
                 return parseConstructorDeclaration(node);
             }
             if (isIndexSignature()) {
                 return parseIndexSignatureDeclaration(node);
             }
+            // It is very important that we check this *after* checking indexers because
+            // the [ token can start an index signature or a computed property name
             if (ts.tokenIsIdentifierOrKeyword(token()) ||
-                token() === 9 ||
-                token() === 8 ||
-                token() === 39 ||
-                token() === 21) {
+                token() === 9 /* StringLiteral */ ||
+                token() === 8 /* NumericLiteral */ ||
+                token() === 39 /* AsteriskToken */ ||
+                token() === 21 /* OpenBracketToken */) {
                 return parsePropertyOrMethodDeclaration(node);
             }
             if (node.decorators || node.modifiers) {
-                node.name = createMissingNode(71, true, ts.Diagnostics.Declaration_expected);
+                // treat this as a property declaration with a missing name.
+                node.name = createMissingNode(71 /* Identifier */, /*reportAtCurrentPosition*/ true, ts.Diagnostics.Declaration_expected);
                 return parsePropertyDeclaration(node);
             }
+            // 'isClassMemberStart' should have hinted not to attempt parsing.
             return ts.Debug.fail("Should not have attempted to parse class member declaration.");
         }
         function parseClassExpression() {
-            return parseClassDeclarationOrExpression(createNodeWithJSDoc(0), 205);
+            return parseClassDeclarationOrExpression(createNodeWithJSDoc(0 /* Unknown */), 205 /* ClassExpression */);
         }
         function parseClassDeclaration(node) {
-            return parseClassDeclarationOrExpression(node, 235);
+            return parseClassDeclarationOrExpression(node, 235 /* ClassDeclaration */);
         }
         function parseClassDeclarationOrExpression(node, kind) {
             node.kind = kind;
-            parseExpected(75);
+            parseExpected(75 /* ClassKeyword */);
             node.name = parseNameOfClassDeclarationOrExpression();
             node.typeParameters = parseTypeParameters();
             node.heritageClauses = parseHeritageClauses();
-            if (parseExpected(17)) {
+            if (parseExpected(17 /* OpenBraceToken */)) {
+                // ClassTail[Yield,Await] : (Modified) See 14.5
+                //      ClassHeritage[?Yield,?Await]opt { ClassBody[?Yield,?Await]opt }
                 node.members = parseClassMembers();
-                parseExpected(18);
+                parseExpected(18 /* CloseBraceToken */);
             }
             else {
                 node.members = createMissingList();
@@ -17246,48 +20135,55 @@ var ts;
             return finishNode(node);
         }
         function parseNameOfClassDeclarationOrExpression() {
+            // implements is a future reserved word so
+            // 'class implements' might mean either
+            // - class expression with omitted name, 'implements' starts heritage clause
+            // - class with name 'implements'
+            // 'isImplementsClause' helps to disambiguate between these two cases
             return isIdentifier() && !isImplementsClause()
                 ? parseIdentifier()
                 : undefined;
         }
         function isImplementsClause() {
-            return token() === 108 && lookAhead(nextTokenIsIdentifierOrKeyword);
+            return token() === 108 /* ImplementsKeyword */ && lookAhead(nextTokenIsIdentifierOrKeyword);
         }
         function parseHeritageClauses() {
+            // ClassTail[Yield,Await] : (Modified) See 14.5
+            //      ClassHeritage[?Yield,?Await]opt { ClassBody[?Yield,?Await]opt }
             if (isHeritageClause()) {
-                return parseList(21, parseHeritageClause);
+                return parseList(21 /* HeritageClauses */, parseHeritageClause);
             }
             return undefined;
         }
         function parseHeritageClause() {
             var tok = token();
-            ts.Debug.assert(tok === 85 || tok === 108);
-            var node = createNode(268);
+            ts.Debug.assert(tok === 85 /* ExtendsKeyword */ || tok === 108 /* ImplementsKeyword */); // isListElement() should ensure this.
+            var node = createNode(268 /* HeritageClause */);
             node.token = tok;
             nextToken();
-            node.types = parseDelimitedList(7, parseExpressionWithTypeArguments);
+            node.types = parseDelimitedList(7 /* HeritageClauseElement */, parseExpressionWithTypeArguments);
             return finishNode(node);
         }
         function parseExpressionWithTypeArguments() {
-            var node = createNode(207);
+            var node = createNode(207 /* ExpressionWithTypeArguments */);
             node.expression = parseLeftHandSideExpressionOrHigher();
             node.typeArguments = tryParseTypeArguments();
             return finishNode(node);
         }
         function tryParseTypeArguments() {
-            return token() === 27
-                ? parseBracketedList(19, parseType, 27, 29)
+            return token() === 27 /* LessThanToken */
+                ? parseBracketedList(19 /* TypeArguments */, parseType, 27 /* LessThanToken */, 29 /* GreaterThanToken */)
                 : undefined;
         }
         function isHeritageClause() {
-            return token() === 85 || token() === 108;
+            return token() === 85 /* ExtendsKeyword */ || token() === 108 /* ImplementsKeyword */;
         }
         function parseClassMembers() {
-            return parseList(5, parseClassElement);
+            return parseList(5 /* ClassMembers */, parseClassElement);
         }
         function parseInterfaceDeclaration(node) {
-            node.kind = 236;
-            parseExpected(109);
+            node.kind = 236 /* InterfaceDeclaration */;
+            parseExpected(109 /* InterfaceKeyword */);
             node.name = parseIdentifier();
             node.typeParameters = parseTypeParameters();
             node.heritageClauses = parseHeritageClauses();
@@ -17295,28 +20191,32 @@ var ts;
             return finishNode(node);
         }
         function parseTypeAliasDeclaration(node) {
-            node.kind = 237;
-            parseExpected(139);
+            node.kind = 237 /* TypeAliasDeclaration */;
+            parseExpected(139 /* TypeKeyword */);
             node.name = parseIdentifier();
             node.typeParameters = parseTypeParameters();
-            parseExpected(58);
+            parseExpected(58 /* EqualsToken */);
             node.type = parseType();
             parseSemicolon();
             return finishNode(node);
         }
+        // In an ambient declaration, the grammar only allows integer literals as initializers.
+        // In a non-ambient declaration, the grammar allows uninitialized members only in a
+        // ConstantEnumMemberSection, which starts at the beginning of an enum declaration
+        // or any time an integer literal initializer is encountered.
         function parseEnumMember() {
-            var node = createNodeWithJSDoc(273);
+            var node = createNodeWithJSDoc(273 /* EnumMember */);
             node.name = parsePropertyName();
             node.initializer = allowInAnd(parseInitializer);
             return finishNode(node);
         }
         function parseEnumDeclaration(node) {
-            node.kind = 238;
-            parseExpected(83);
+            node.kind = 238 /* EnumDeclaration */;
+            parseExpected(83 /* EnumKeyword */);
             node.name = parseIdentifier();
-            if (parseExpected(17)) {
-                node.members = parseDelimitedList(6, parseEnumMember);
-                parseExpected(18);
+            if (parseExpected(17 /* OpenBraceToken */)) {
+                node.members = parseDelimitedList(6 /* EnumMembers */, parseEnumMember);
+                parseExpected(18 /* CloseBraceToken */);
             }
             else {
                 node.members = createMissingList();
@@ -17324,10 +20224,10 @@ var ts;
             return finishNode(node);
         }
         function parseModuleBlock() {
-            var node = createNode(240);
-            if (parseExpected(17)) {
-                node.statements = parseList(1, parseStatement);
-                parseExpected(18);
+            var node = createNode(240 /* ModuleBlock */);
+            if (parseExpected(17 /* OpenBraceToken */)) {
+                node.statements = parseList(1 /* BlockStatements */, parseStatement);
+                parseExpected(18 /* CloseBraceToken */);
             }
             else {
                 node.statements = createMissingList();
@@ -17335,26 +20235,29 @@ var ts;
             return finishNode(node);
         }
         function parseModuleOrNamespaceDeclaration(node, flags) {
-            node.kind = 239;
-            var namespaceFlag = flags & 16;
+            node.kind = 239 /* ModuleDeclaration */;
+            // If we are parsing a dotted namespace name, we want to
+            // propagate the 'Namespace' flag across the names if set.
+            var namespaceFlag = flags & 16 /* Namespace */;
             node.flags |= flags;
             node.name = parseIdentifier();
-            node.body = parseOptional(23)
-                ? parseModuleOrNamespaceDeclaration(createNode(0), 4 | namespaceFlag)
+            node.body = parseOptional(23 /* DotToken */)
+                ? parseModuleOrNamespaceDeclaration(createNode(0 /* Unknown */), 4 /* NestedNamespace */ | namespaceFlag)
                 : parseModuleBlock();
             return finishNode(node);
         }
         function parseAmbientExternalModuleDeclaration(node) {
-            node.kind = 239;
-            if (token() === 144) {
+            node.kind = 239 /* ModuleDeclaration */;
+            if (token() === 144 /* GlobalKeyword */) {
+                // parse 'global' as name of global scope augmentation
                 node.name = parseIdentifier();
-                node.flags |= 512;
+                node.flags |= 512 /* GlobalAugmentation */;
             }
             else {
                 node.name = parseLiteralNode();
                 node.name.text = internIdentifier(node.name.text);
             }
-            if (token() === 17) {
+            if (token() === 17 /* OpenBraceToken */) {
                 node.body = parseModuleBlock();
             }
             else {
@@ -17364,128 +20267,161 @@ var ts;
         }
         function parseModuleDeclaration(node) {
             var flags = 0;
-            if (token() === 144) {
+            if (token() === 144 /* GlobalKeyword */) {
+                // global augmentation
                 return parseAmbientExternalModuleDeclaration(node);
             }
-            else if (parseOptional(130)) {
-                flags |= 16;
+            else if (parseOptional(130 /* NamespaceKeyword */)) {
+                flags |= 16 /* Namespace */;
             }
             else {
-                parseExpected(129);
-                if (token() === 9) {
+                parseExpected(129 /* ModuleKeyword */);
+                if (token() === 9 /* StringLiteral */) {
                     return parseAmbientExternalModuleDeclaration(node);
                 }
             }
             return parseModuleOrNamespaceDeclaration(node, flags);
         }
         function isExternalModuleReference() {
-            return token() === 133 &&
+            return token() === 133 /* RequireKeyword */ &&
                 lookAhead(nextTokenIsOpenParen);
         }
         function nextTokenIsOpenParen() {
-            return nextToken() === 19;
+            return nextToken() === 19 /* OpenParenToken */;
         }
         function nextTokenIsSlash() {
-            return nextToken() === 41;
+            return nextToken() === 41 /* SlashToken */;
         }
         function parseNamespaceExportDeclaration(node) {
-            node.kind = 242;
-            parseExpected(118);
-            parseExpected(130);
+            node.kind = 242 /* NamespaceExportDeclaration */;
+            parseExpected(118 /* AsKeyword */);
+            parseExpected(130 /* NamespaceKeyword */);
             node.name = parseIdentifier();
             parseSemicolon();
             return finishNode(node);
         }
         function parseImportDeclarationOrImportEqualsDeclaration(node) {
-            parseExpected(91);
+            parseExpected(91 /* ImportKeyword */);
             var afterImportPos = scanner.getStartPos();
             var identifier;
             if (isIdentifier()) {
                 identifier = parseIdentifier();
-                if (token() !== 26 && token() !== 143) {
+                if (token() !== 26 /* CommaToken */ && token() !== 143 /* FromKeyword */) {
                     return parseImportEqualsDeclaration(node, identifier);
                 }
             }
-            node.kind = 244;
-            if (identifier ||
-                token() === 39 ||
-                token() === 17) {
+            // Import statement
+            node.kind = 244 /* ImportDeclaration */;
+            // ImportDeclaration:
+            //  import ImportClause from ModuleSpecifier ;
+            //  import ModuleSpecifier;
+            if (identifier || // import id
+                token() === 39 /* AsteriskToken */ || // import *
+                token() === 17 /* OpenBraceToken */) { // import {
                 node.importClause = parseImportClause(identifier, afterImportPos);
-                parseExpected(143);
+                parseExpected(143 /* FromKeyword */);
             }
             node.moduleSpecifier = parseModuleSpecifier();
             parseSemicolon();
             return finishNode(node);
         }
         function parseImportEqualsDeclaration(node, identifier) {
-            node.kind = 243;
+            node.kind = 243 /* ImportEqualsDeclaration */;
             node.name = identifier;
-            parseExpected(58);
+            parseExpected(58 /* EqualsToken */);
             node.moduleReference = parseModuleReference();
             parseSemicolon();
             return finishNode(node);
         }
         function parseImportClause(identifier, fullStart) {
-            var importClause = createNode(245, fullStart);
+            // ImportClause:
+            //  ImportedDefaultBinding
+            //  NameSpaceImport
+            //  NamedImports
+            //  ImportedDefaultBinding, NameSpaceImport
+            //  ImportedDefaultBinding, NamedImports
+            var importClause = createNode(245 /* ImportClause */, fullStart);
             if (identifier) {
+                // ImportedDefaultBinding:
+                //  ImportedBinding
                 importClause.name = identifier;
             }
+            // If there was no default import or if there is comma token after default import
+            // parse namespace or named imports
             if (!importClause.name ||
-                parseOptional(26)) {
-                importClause.namedBindings = token() === 39 ? parseNamespaceImport() : parseNamedImportsOrExports(247);
+                parseOptional(26 /* CommaToken */)) {
+                importClause.namedBindings = token() === 39 /* AsteriskToken */ ? parseNamespaceImport() : parseNamedImportsOrExports(247 /* NamedImports */);
             }
             return finishNode(importClause);
         }
         function parseModuleReference() {
             return isExternalModuleReference()
                 ? parseExternalModuleReference()
-                : parseEntityName(false);
+                : parseEntityName(/*allowReservedWords*/ false);
         }
         function parseExternalModuleReference() {
-            var node = createNode(254);
-            parseExpected(133);
-            parseExpected(19);
+            var node = createNode(254 /* ExternalModuleReference */);
+            parseExpected(133 /* RequireKeyword */);
+            parseExpected(19 /* OpenParenToken */);
             node.expression = parseModuleSpecifier();
-            parseExpected(20);
+            parseExpected(20 /* CloseParenToken */);
             return finishNode(node);
         }
         function parseModuleSpecifier() {
-            if (token() === 9) {
+            if (token() === 9 /* StringLiteral */) {
                 var result = parseLiteralNode();
                 result.text = internIdentifier(result.text);
                 return result;
             }
             else {
+                // We allow arbitrary expressions here, even though the grammar only allows string
+                // literals.  We check to ensure that it is only a string literal later in the grammar
+                // check pass.
                 return parseExpression();
             }
         }
         function parseNamespaceImport() {
-            var namespaceImport = createNode(246);
-            parseExpected(39);
-            parseExpected(118);
+            // NameSpaceImport:
+            //  * as ImportedBinding
+            var namespaceImport = createNode(246 /* NamespaceImport */);
+            parseExpected(39 /* AsteriskToken */);
+            parseExpected(118 /* AsKeyword */);
             namespaceImport.name = parseIdentifier();
             return finishNode(namespaceImport);
         }
         function parseNamedImportsOrExports(kind) {
             var node = createNode(kind);
-            node.elements = parseBracketedList(22, kind === 247 ? parseImportSpecifier : parseExportSpecifier, 17, 18);
+            // NamedImports:
+            //  { }
+            //  { ImportsList }
+            //  { ImportsList, }
+            // ImportsList:
+            //  ImportSpecifier
+            //  ImportsList, ImportSpecifier
+            node.elements = parseBracketedList(22 /* ImportOrExportSpecifiers */, kind === 247 /* NamedImports */ ? parseImportSpecifier : parseExportSpecifier, 17 /* OpenBraceToken */, 18 /* CloseBraceToken */);
             return finishNode(node);
         }
         function parseExportSpecifier() {
-            return parseImportOrExportSpecifier(252);
+            return parseImportOrExportSpecifier(252 /* ExportSpecifier */);
         }
         function parseImportSpecifier() {
-            return parseImportOrExportSpecifier(248);
+            return parseImportOrExportSpecifier(248 /* ImportSpecifier */);
         }
         function parseImportOrExportSpecifier(kind) {
             var node = createNode(kind);
+            // ImportSpecifier:
+            //   BindingIdentifier
+            //   IdentifierName as BindingIdentifier
+            // ExportSpecifier:
+            //   IdentifierName
+            //   IdentifierName as IdentifierName
             var checkIdentifierIsKeyword = ts.isKeyword(token()) && !isIdentifier();
             var checkIdentifierStart = scanner.getTokenPos();
             var checkIdentifierEnd = scanner.getTextPos();
             var identifierName = parseIdentifierName();
-            if (token() === 118) {
+            if (token() === 118 /* AsKeyword */) {
                 node.propertyName = identifierName;
-                parseExpected(118);
+                parseExpected(118 /* AsKeyword */);
                 checkIdentifierIsKeyword = ts.isKeyword(token()) && !isIdentifier();
                 checkIdentifierStart = scanner.getTokenPos();
                 checkIdentifierEnd = scanner.getTextPos();
@@ -17494,21 +20430,24 @@ var ts;
             else {
                 node.name = identifierName;
             }
-            if (kind === 248 && checkIdentifierIsKeyword) {
+            if (kind === 248 /* ImportSpecifier */ && checkIdentifierIsKeyword) {
                 parseErrorAt(checkIdentifierStart, checkIdentifierEnd, ts.Diagnostics.Identifier_expected);
             }
             return finishNode(node);
         }
         function parseExportDeclaration(node) {
-            node.kind = 250;
-            if (parseOptional(39)) {
-                parseExpected(143);
+            node.kind = 250 /* ExportDeclaration */;
+            if (parseOptional(39 /* AsteriskToken */)) {
+                parseExpected(143 /* FromKeyword */);
                 node.moduleSpecifier = parseModuleSpecifier();
             }
             else {
-                node.exportClause = parseNamedImportsOrExports(251);
-                if (token() === 143 || (token() === 9 && !scanner.hasPrecedingLineBreak())) {
-                    parseExpected(143);
+                node.exportClause = parseNamedImportsOrExports(251 /* NamedExports */);
+                // It is not uncommon to accidentally omit the 'from' keyword. Additionally, in editing scenarios,
+                // the 'from' keyword can be parsed as a named export when the export clause is unterminated (i.e. `export { from "moduleName";`)
+                // If we don't have a 'from' keyword, see if we have a string literal such that ASI won't take effect.
+                if (token() === 143 /* FromKeyword */ || (token() === 9 /* StringLiteral */ && !scanner.hasPrecedingLineBreak())) {
+                    parseExpected(143 /* FromKeyword */);
                     node.moduleSpecifier = parseModuleSpecifier();
                 }
             }
@@ -17516,33 +20455,35 @@ var ts;
             return finishNode(node);
         }
         function parseExportAssignment(node) {
-            node.kind = 249;
-            if (parseOptional(58)) {
+            node.kind = 249 /* ExportAssignment */;
+            if (parseOptional(58 /* EqualsToken */)) {
                 node.isExportEquals = true;
             }
             else {
-                parseExpected(79);
+                parseExpected(79 /* DefaultKeyword */);
             }
             node.expression = parseAssignmentExpressionOrHigher();
             parseSemicolon();
             return finishNode(node);
         }
         function setExternalModuleIndicator(sourceFile) {
+            // Try to use the first top-level import/export when available, then
+            // fall back to looking for an 'import.meta' somewhere in the tree if necessary.
             sourceFile.externalModuleIndicator =
                 ts.forEach(sourceFile.statements, isAnExternalModuleIndicatorNode) ||
                     getImportMetaIfNecessary(sourceFile);
         }
         function isAnExternalModuleIndicatorNode(node) {
-            return ts.hasModifier(node, 1)
-                || node.kind === 243 && node.moduleReference.kind === 254
-                || node.kind === 244
-                || node.kind === 249
-                || node.kind === 250
+            return ts.hasModifier(node, 1 /* Export */)
+                || node.kind === 243 /* ImportEqualsDeclaration */ && node.moduleReference.kind === 254 /* ExternalModuleReference */
+                || node.kind === 244 /* ImportDeclaration */
+                || node.kind === 249 /* ExportAssignment */
+                || node.kind === 250 /* ExportDeclaration */
                 ? node
                 : undefined;
         }
         function getImportMetaIfNecessary(sourceFile) {
-            return sourceFile.flags & 1048576 ?
+            return sourceFile.flags & 1048576 /* PossiblyContainsImportMeta */ ?
                 walkTreeForExternalModuleIndicators(sourceFile) :
                 undefined;
         }
@@ -17550,7 +20491,7 @@ var ts;
             return isImportMeta(node) ? node : forEachChild(node, walkTreeForExternalModuleIndicators);
         }
         function isImportMeta(node) {
-            return ts.isMetaProperty(node) && node.keywordToken === 91 && node.name.escapedText === "meta";
+            return ts.isMetaProperty(node) && node.keywordToken === 91 /* ImportKeyword */ && node.name.escapedText === "meta";
         }
         var ParsingContext;
         (function (ParsingContext) {
@@ -17577,7 +20518,7 @@ var ts;
             ParsingContext[ParsingContext["TupleElementTypes"] = 20] = "TupleElementTypes";
             ParsingContext[ParsingContext["HeritageClauses"] = 21] = "HeritageClauses";
             ParsingContext[ParsingContext["ImportOrExportSpecifiers"] = 22] = "ImportOrExportSpecifiers";
-            ParsingContext[ParsingContext["Count"] = 23] = "Count";
+            ParsingContext[ParsingContext["Count"] = 23] = "Count"; // Number of parsing contexts
         })(ParsingContext || (ParsingContext = {}));
         var Tristate;
         (function (Tristate) {
@@ -17588,8 +20529,8 @@ var ts;
         var JSDocParser;
         (function (JSDocParser) {
             function parseJSDocTypeExpressionForTests(content, start, length) {
-                initializeState(content, 6, undefined, 1);
-                sourceFile = createSourceFile("file.js", 6, 1, false);
+                initializeState(content, 6 /* Latest */, /*_syntaxCursor:*/ undefined, 1 /* JS */);
+                sourceFile = createSourceFile("file.js", 6 /* Latest */, 1 /* JS */, /*isDeclarationFile*/ false);
                 scanner.setText(content, start, length);
                 currentToken = scanner.scan();
                 var jsDocTypeExpression = parseJSDocTypeExpression();
@@ -17598,20 +20539,21 @@ var ts;
                 return jsDocTypeExpression ? { jsDocTypeExpression: jsDocTypeExpression, diagnostics: diagnostics } : undefined;
             }
             JSDocParser.parseJSDocTypeExpressionForTests = parseJSDocTypeExpressionForTests;
+            // Parses out a JSDoc type expression.
             function parseJSDocTypeExpression(mayOmitBraces) {
-                var result = createNode(278, scanner.getTokenPos());
-                var hasBrace = (mayOmitBraces ? parseOptional : parseExpected)(17);
-                result.type = doInsideOfContext(2097152, parseJSDocType);
+                var result = createNode(278 /* JSDocTypeExpression */, scanner.getTokenPos());
+                var hasBrace = (mayOmitBraces ? parseOptional : parseExpected)(17 /* OpenBraceToken */);
+                result.type = doInsideOfContext(2097152 /* JSDoc */, parseJSDocType);
                 if (!mayOmitBraces || hasBrace) {
-                    parseExpected(18);
+                    parseExpected(18 /* CloseBraceToken */);
                 }
                 fixupParentReferences(result);
                 return finishNode(result);
             }
             JSDocParser.parseJSDocTypeExpression = parseJSDocTypeExpression;
             function parseIsolatedJSDocComment(content, start, length) {
-                initializeState(content, 6, undefined, 1);
-                sourceFile = { languageVariant: 0, text: content };
+                initializeState(content, 6 /* Latest */, /*_syntaxCursor:*/ undefined, 1 /* JS */);
+                sourceFile = { languageVariant: 0 /* Standard */, text: content }; // tslint:disable-line no-object-literal-type-assertion
                 var jsDoc = parseJSDocCommentWorker(start, length);
                 var diagnostics = parseDiagnostics;
                 clearState();
@@ -17627,7 +20569,7 @@ var ts;
                 if (comment) {
                     comment.parent = parent;
                 }
-                if (contextFlags & 65536) {
+                if (contextFlags & 65536 /* JavaScriptFile */) {
                     if (!sourceFile.jsDocDiagnostics) {
                         sourceFile.jsDocDiagnostics = [];
                     }
@@ -17664,12 +20606,17 @@ var ts;
                 var tagsEnd;
                 var comments = [];
                 var result;
+                // Check for /** (JSDoc opening part)
                 if (!isJSDocLikeText(content, start)) {
                     return result;
                 }
+                // + 3 for leading /**, - 5 in total for /** */
                 scanner.scanRange(start + 3, length - 5, function () {
-                    var state = 1;
+                    // Initially we can parse out a tag.  We also have seen a starting asterisk.
+                    // This is so that /** * @type */ doesn't parse.
+                    var state = 1 /* SawAsterisk */;
                     var margin;
+                    // + 4 for leading '/** '
                     var indent = start - Math.max(content.lastIndexOf("\n", start), 0) + 4;
                     function pushComment(text) {
                         if (!margin) {
@@ -17679,19 +20626,22 @@ var ts;
                         indent += text.length;
                     }
                     nextJSDocToken();
-                    while (parseOptionalJsdoc(5))
+                    while (parseOptionalJsdoc(5 /* WhitespaceTrivia */))
                         ;
-                    if (parseOptionalJsdoc(4)) {
-                        state = 0;
+                    if (parseOptionalJsdoc(4 /* NewLineTrivia */)) {
+                        state = 0 /* BeginningOfLine */;
                         indent = 0;
                     }
                     loop: while (true) {
                         switch (token()) {
-                            case 57:
-                                if (state === 0 || state === 1) {
+                            case 57 /* AtToken */:
+                                if (state === 0 /* BeginningOfLine */ || state === 1 /* SawAsterisk */) {
                                     removeTrailingNewlines(comments);
                                     addTag(parseTag(indent));
-                                    state = 0;
+                                    // NOTE: According to usejsdoc.org, a tag goes to end of line, except the last tag.
+                                    // Real-world comments may break this rule, so "BeginningOfLine" will not be a real line beginning
+                                    // for malformed examples like `/** @param {string} x @returns {number} the length */`
+                                    state = 0 /* BeginningOfLine */;
                                     margin = undefined;
                                     indent++;
                                 }
@@ -17699,29 +20649,35 @@ var ts;
                                     pushComment(scanner.getTokenText());
                                 }
                                 break;
-                            case 4:
+                            case 4 /* NewLineTrivia */:
                                 comments.push(scanner.getTokenText());
-                                state = 0;
+                                state = 0 /* BeginningOfLine */;
                                 indent = 0;
                                 break;
-                            case 39:
+                            case 39 /* AsteriskToken */:
                                 var asterisk = scanner.getTokenText();
-                                if (state === 1 || state === 2) {
-                                    state = 2;
+                                if (state === 1 /* SawAsterisk */ || state === 2 /* SavingComments */) {
+                                    // If we've already seen an asterisk, then we can no longer parse a tag on this line
+                                    state = 2 /* SavingComments */;
                                     pushComment(asterisk);
                                 }
                                 else {
-                                    state = 1;
+                                    // Ignore the first asterisk on a line
+                                    state = 1 /* SawAsterisk */;
                                     indent += asterisk.length;
                                 }
                                 break;
-                            case 71:
+                            case 71 /* Identifier */:
+                                // Anything else is doc comment text. We just save it. Because it
+                                // wasn't a tag, we can no longer parse a tag on this line until we hit the next
+                                // line break.
                                 pushComment(scanner.getTokenText());
-                                state = 2;
+                                state = 2 /* SavingComments */;
                                 break;
-                            case 5:
+                            case 5 /* WhitespaceTrivia */:
+                                // only collect whitespace if we're already saving comments or have just crossed the comment indent margin
                                 var whitespace = scanner.getTokenText();
-                                if (state === 2) {
+                                if (state === 2 /* SavingComments */) {
                                     comments.push(whitespace);
                                 }
                                 else if (margin !== undefined && indent + whitespace.length > margin) {
@@ -17729,10 +20685,11 @@ var ts;
                                 }
                                 indent += whitespace.length;
                                 break;
-                            case 1:
+                            case 1 /* EndOfFileToken */:
                                 break loop;
                             default:
-                                state = 2;
+                                // anything other than whitespace or asterisk at the beginning of the line starts the comment text
+                                state = 2 /* SavingComments */;
                                 pushComment(scanner.getTokenText());
                                 break;
                         }
@@ -17754,92 +20711,83 @@ var ts;
                     }
                 }
                 function createJSDocComment() {
-                    var result = createNode(286, start);
+                    var result = createNode(286 /* JSDocComment */, start);
                     result.tags = tags && createNodeArray(tags, tagsPos, tagsEnd);
                     result.comment = comments.length ? comments.join("") : undefined;
                     return finishNode(result, end);
                 }
                 function isNextNonwhitespaceTokenEndOfFile() {
+                    // We must use infinite lookahead, as there could be any number of newlines :(
                     while (true) {
                         nextJSDocToken();
-                        if (token() === 1) {
+                        if (token() === 1 /* EndOfFileToken */) {
                             return true;
                         }
-                        if (!(token() === 5 || token() === 4)) {
+                        if (!(token() === 5 /* WhitespaceTrivia */ || token() === 4 /* NewLineTrivia */)) {
                             return false;
                         }
                     }
                 }
                 function skipWhitespace() {
-                    if (token() === 5 || token() === 4) {
+                    if (token() === 5 /* WhitespaceTrivia */ || token() === 4 /* NewLineTrivia */) {
                         if (lookAhead(isNextNonwhitespaceTokenEndOfFile)) {
-                            return;
+                            return; // Don't skip whitespace prior to EoF (or end of comment) - that shouldn't be included in any node's range
                         }
                     }
-                    while (token() === 5 || token() === 4) {
+                    while (token() === 5 /* WhitespaceTrivia */ || token() === 4 /* NewLineTrivia */) {
                         nextJSDocToken();
                     }
                 }
                 function parseTag(indent) {
-                    ts.Debug.assert(token() === 57);
-                    var atToken = createNode(57, scanner.getTokenPos());
+                    ts.Debug.assert(token() === 57 /* AtToken */);
+                    var atToken = createNode(57 /* AtToken */, scanner.getTokenPos());
                     atToken.end = scanner.getTextPos();
                     nextJSDocToken();
                     var tagName = parseJSDocIdentifierName();
                     skipWhitespace();
-                    if (!tagName) {
-                        return;
-                    }
                     var tag;
-                    if (tagName) {
-                        switch (tagName.escapedText) {
-                            case "augments":
-                            case "extends":
-                                tag = parseAugmentsTag(atToken, tagName);
-                                break;
-                            case "class":
-                            case "constructor":
-                                tag = parseClassTag(atToken, tagName);
-                                break;
-                            case "arg":
-                            case "argument":
-                            case "param":
-                                return parseParameterOrPropertyTag(atToken, tagName, 2, indent);
-                            case "return":
-                            case "returns":
-                                tag = parseReturnTag(atToken, tagName);
-                                break;
-                            case "template":
-                                tag = parseTemplateTag(atToken, tagName);
-                                break;
-                            case "type":
-                                tag = parseTypeTag(atToken, tagName);
-                                break;
-                            case "typedef":
-                                tag = parseTypedefTag(atToken, tagName, indent);
-                                break;
-                            case "callback":
-                                tag = parseCallbackTag(atToken, tagName, indent);
-                                break;
-                            default:
-                                tag = parseUnknownTag(atToken, tagName);
-                                break;
-                        }
-                    }
-                    else {
-                        tag = parseUnknownTag(atToken, tagName);
-                    }
-                    if (!tag) {
-                        return;
+                    switch (tagName.escapedText) {
+                        case "augments":
+                        case "extends":
+                            tag = parseAugmentsTag(atToken, tagName);
+                            break;
+                        case "class":
+                        case "constructor":
+                            tag = parseClassTag(atToken, tagName);
+                            break;
+                        case "arg":
+                        case "argument":
+                        case "param":
+                            return parseParameterOrPropertyTag(atToken, tagName, 2 /* Parameter */, indent);
+                        case "return":
+                        case "returns":
+                            tag = parseReturnTag(atToken, tagName);
+                            break;
+                        case "template":
+                            tag = parseTemplateTag(atToken, tagName);
+                            break;
+                        case "type":
+                            tag = parseTypeTag(atToken, tagName);
+                            break;
+                        case "typedef":
+                            tag = parseTypedefTag(atToken, tagName, indent);
+                            break;
+                        case "callback":
+                            tag = parseCallbackTag(atToken, tagName, indent);
+                            break;
+                        default:
+                            tag = parseUnknownTag(atToken, tagName);
+                            break;
                     }
                     if (!tag.comment) {
+                        // some tags, like typedef and callback, have already parsed their comments earlier
                         tag.comment = parseTagComments(indent + tag.end - tag.pos);
                     }
                     return tag;
                 }
                 function parseTagComments(indent) {
                     var comments = [];
-                    var state = 0;
+                    var state = 0 /* BeginningOfLine */;
                     var margin;
                     function pushComment(text) {
                         if (!margin) {
@@ -17851,37 +20799,43 @@ var ts;
                     var tok = token();
                     loop: while (true) {
                         switch (tok) {
-                            case 4:
-                                if (state >= 1) {
-                                    state = 0;
+                            case 4 /* NewLineTrivia */:
+                                if (state >= 1 /* SawAsterisk */) {
+                                    state = 0 /* BeginningOfLine */;
                                     comments.push(scanner.getTokenText());
                                 }
                                 indent = 0;
                                 break;
-                            case 57:
+                            case 57 /* AtToken */:
                                 scanner.setTextPos(scanner.getTextPos() - 1);
-                            case 1:
+                            // falls through
+                            case 1 /* EndOfFileToken */:
+                                // Done
                                 break loop;
-                            case 5:
-                                if (state === 2) {
+                            case 5 /* WhitespaceTrivia */:
+                                if (state === 2 /* SavingComments */) {
                                     pushComment(scanner.getTokenText());
                                 }
                                 else {
                                     var whitespace = scanner.getTokenText();
+                                    // if the whitespace crosses the margin, take only the whitespace that passes the margin
                                     if (margin !== undefined && indent + whitespace.length > margin) {
                                         comments.push(whitespace.slice(margin - indent - 1));
                                     }
                                     indent += whitespace.length;
                                 }
                                 break;
-                            case 39:
-                                if (state === 0) {
-                                    state = 1;
+                            case 39 /* AsteriskToken */:
+                                if (state === 0 /* BeginningOfLine */) {
+                                    // leading asterisks start recording on the *next* (non-whitespace) token
+                                    state = 1 /* SawAsterisk */;
                                     indent += 1;
                                     break;
                                 }
+                            // record the * as a comment
+                            // falls through
                             default:
-                                state = 2;
+                                state = 2 /* SavingComments */; // leading identifiers start recording as well
                                 pushComment(scanner.getTokenText());
                                 break;
                         }
@@ -17892,7 +20846,7 @@ var ts;
                     return comments.length === 0 ? undefined : comments.join("");
                 }
                 function parseUnknownTag(atToken, tagName) {
-                    var result = createNode(289, atToken.pos);
+                    var result = createNode(289 /* JSDocTag */, atToken.pos);
                     result.atToken = atToken;
                     result.tagName = tagName;
                     return finishNode(result);
@@ -17912,28 +20866,31 @@ var ts;
                 }
                 function tryParseTypeExpression() {
                     skipWhitespace();
-                    return token() === 17 ? parseJSDocTypeExpression() : undefined;
+                    return token() === 17 /* OpenBraceToken */ ? parseJSDocTypeExpression() : undefined;
                 }
                 function parseBracketNameInPropertyAndParamTag() {
-                    if (token() === 13) {
-                        return { name: createIdentifier(true), isBracketed: false };
+                    if (token() === 13 /* NoSubstitutionTemplateLiteral */) {
+                        // a markdown-quoted name: `arg` is not legal jsdoc, but occurs in the wild
+                        return { name: createIdentifier(/*isIdentifier*/ true), isBracketed: false };
                     }
-                    var isBracketed = parseOptional(21);
+                    // Looking for something like '[foo]', 'foo', '[foo.bar]' or 'foo.bar'
+                    var isBracketed = parseOptional(21 /* OpenBracketToken */);
                     var name = parseJSDocEntityName();
                     if (isBracketed) {
                         skipWhitespace();
-                        if (parseOptionalToken(58)) {
+                        // May have an optional default, e.g. '[foo = 42]'
+                        if (parseOptionalToken(58 /* EqualsToken */)) {
                             parseExpression();
                         }
-                        parseExpected(22);
+                        parseExpected(22 /* CloseBracketToken */);
                     }
                     return { name: name, isBracketed: isBracketed };
                 }
                 function isObjectOrObjectArrayTypeReference(node) {
                     switch (node.kind) {
-                        case 135:
+                        case 135 /* ObjectKeyword */:
                             return true;
-                        case 167:
+                        case 167 /* ArrayType */:
                             return isObjectOrObjectArrayTypeReference(node.elementType);
                         default:
                             return ts.isTypeReferenceNode(node) && ts.isIdentifier(node.typeName) && node.typeName.escapedText === "Object";
@@ -17948,13 +20905,13 @@ var ts;
                     if (isNameFirst) {
                         typeExpression = tryParseTypeExpression();
                     }
-                    var result = target === 1 ?
-                        createNode(298, atToken.pos) :
-                        createNode(293, atToken.pos);
+                    var result = target === 1 /* Property */ ?
+                        createNode(298 /* JSDocPropertyTag */, atToken.pos) :
+                        createNode(293 /* JSDocParameterTag */, atToken.pos);
                     var comment;
                     if (indent !== undefined)
                         comment = parseTagComments(indent + scanner.getStartPos() - atToken.pos);
-                    var nestedTypeLiteral = target !== 4 && parseNestedTypeLiteral(typeExpression, name, target);
+                    var nestedTypeLiteral = target !== 4 /* CallbackParameter */ && parseNestedTypeLiteral(typeExpression, name, target);
                     if (nestedTypeLiteral) {
                         typeExpression = nestedTypeLiteral;
                         isNameFirst = true;
@@ -17970,20 +20927,20 @@ var ts;
                 }
                 function parseNestedTypeLiteral(typeExpression, name, target) {
                     if (typeExpression && isObjectOrObjectArrayTypeReference(typeExpression.type)) {
-                        var typeLiteralExpression = createNode(278, scanner.getTokenPos());
+                        var typeLiteralExpression = createNode(278 /* JSDocTypeExpression */, scanner.getTokenPos());
                         var child = void 0;
                         var jsdocTypeLiteral = void 0;
                         var start_2 = scanner.getStartPos();
                         var children = void 0;
                         while (child = tryParse(function () { return parseChildParameterOrPropertyTag(target, name); })) {
-                            if (child.kind === 293 || child.kind === 298) {
+                            if (child.kind === 293 /* JSDocParameterTag */ || child.kind === 298 /* JSDocPropertyTag */) {
                                 children = ts.append(children, child);
                             }
                         }
                         if (children) {
-                            jsdocTypeLiteral = createNode(287, start_2);
+                            jsdocTypeLiteral = createNode(287 /* JSDocTypeLiteral */, start_2);
                             jsdocTypeLiteral.jsDocPropertyTags = children;
-                            if (typeExpression.type.kind === 167) {
+                            if (typeExpression.type.kind === 167 /* ArrayType */) {
                                 jsdocTypeLiteral.isArrayType = true;
                             }
                             typeLiteralExpression.type = finishNode(jsdocTypeLiteral);
@@ -17992,47 +20949,47 @@ var ts;
                     }
                 }
                 function parseReturnTag(atToken, tagName) {
-                    if (ts.forEach(tags, function (t) { return t.kind === 294; })) {
+                    if (ts.forEach(tags, function (t) { return t.kind === 294 /* JSDocReturnTag */; })) {
                         parseErrorAt(tagName.pos, scanner.getTokenPos(), ts.Diagnostics._0_tag_already_specified, tagName.escapedText);
                     }
-                    var result = createNode(294, atToken.pos);
+                    var result = createNode(294 /* JSDocReturnTag */, atToken.pos);
                     result.atToken = atToken;
                     result.tagName = tagName;
                     result.typeExpression = tryParseTypeExpression();
                     return finishNode(result);
                 }
                 function parseTypeTag(atToken, tagName) {
-                    if (ts.forEach(tags, function (t) { return t.kind === 295; })) {
+                    if (ts.forEach(tags, function (t) { return t.kind === 295 /* JSDocTypeTag */; })) {
                         parseErrorAt(tagName.pos, scanner.getTokenPos(), ts.Diagnostics._0_tag_already_specified, tagName.escapedText);
                     }
-                    var result = createNode(295, atToken.pos);
+                    var result = createNode(295 /* JSDocTypeTag */, atToken.pos);
                     result.atToken = atToken;
                     result.tagName = tagName;
-                    result.typeExpression = parseJSDocTypeExpression(true);
+                    result.typeExpression = parseJSDocTypeExpression(/*mayOmitBraces*/ true);
                     return finishNode(result);
                 }
                 function parseAugmentsTag(atToken, tagName) {
-                    var result = createNode(290, atToken.pos);
+                    var result = createNode(290 /* JSDocAugmentsTag */, atToken.pos);
                     result.atToken = atToken;
                     result.tagName = tagName;
                     result.class = parseExpressionWithTypeArgumentsForAugments();
                     return finishNode(result);
                 }
                 function parseExpressionWithTypeArgumentsForAugments() {
-                    var usedBrace = parseOptional(17);
-                    var node = createNode(207);
+                    var usedBrace = parseOptional(17 /* OpenBraceToken */);
+                    var node = createNode(207 /* ExpressionWithTypeArguments */);
                     node.expression = parsePropertyAccessEntityNameExpression();
                     node.typeArguments = tryParseTypeArguments();
                     var res = finishNode(node);
                     if (usedBrace) {
-                        parseExpected(18);
+                        parseExpected(18 /* CloseBraceToken */);
                     }
                     return res;
                 }
                 function parsePropertyAccessEntityNameExpression() {
-                    var node = parseJSDocIdentifierName(true);
-                    while (parseOptional(23)) {
-                        var prop = createNode(185, node.pos);
+                    var node = parseJSDocIdentifierName();
+                    while (parseOptional(23 /* DotToken */)) {
+                        var prop = createNode(185 /* PropertyAccessExpression */, node.pos);
                         prop.expression = node;
                         prop.name = parseJSDocIdentifierName();
                         node = finishNode(prop);
@@ -18040,7 +20997,7 @@ var ts;
                     return node;
                 }
                 function parseClassTag(atToken, tagName) {
-                    var tag = createNode(291, atToken.pos);
+                    var tag = createNode(291 /* JSDocClassTag */, atToken.pos);
                     tag.atToken = atToken;
                     tag.tagName = tagName;
                     return finishNode(tag);
@@ -18048,7 +21005,7 @@ var ts;
                 function parseTypedefTag(atToken, tagName, indent) {
                     var typeExpression = tryParseTypeExpression();
                     skipWhitespace();
-                    var typedefTag = createNode(297, atToken.pos);
+                    var typedefTag = createNode(297 /* JSDocTypedefTag */, atToken.pos);
                     typedefTag.atToken = atToken;
                     typedefTag.tagName = tagName;
                     typedefTag.fullName = parseJSDocTypeNameWithNamespace();
@@ -18064,9 +21021,9 @@ var ts;
                         var start_3 = scanner.getStartPos();
                         while (child = tryParse(function () { return parseChildPropertyTag(); })) {
                             if (!jsdocTypeLiteral) {
-                                jsdocTypeLiteral = createNode(287, start_3);
+                                jsdocTypeLiteral = createNode(287 /* JSDocTypeLiteral */, start_3);
                             }
-                            if (child.kind === 295) {
+                            if (child.kind === 295 /* JSDocTypeTag */) {
                                 if (childTypeTag) {
                                     break;
                                 }
@@ -18079,7 +21036,7 @@ var ts;
                             }
                         }
                         if (jsdocTypeLiteral) {
-                            if (typeExpression && typeExpression.type.kind === 167) {
+                            if (typeExpression && typeExpression.type.kind === 167 /* ArrayType */) {
                                 jsdocTypeLiteral.isArrayType = true;
                             }
                             typedefTag.typeExpression = childTypeTag && childTypeTag.typeExpression && !isObjectOrObjectArrayTypeReference(childTypeTag.typeExpression.type) ?
@@ -18088,27 +21045,31 @@ var ts;
                             end = typedefTag.typeExpression.end;
                         }
                     }
+                    // Only include the characters between the name end and the next token if a comment was actually parsed out - otherwise it's just whitespace
                     return finishNode(typedefTag, end || typedefTag.comment !== undefined ? scanner.getStartPos() : (typedefTag.fullName || typedefTag.typeExpression || typedefTag.tagName).end);
                 }
                 function parseJSDocTypeNameWithNamespace(nested) {
                     var pos = scanner.getTokenPos();
+                    if (!ts.tokenIsIdentifierOrKeyword(token())) {
+                        return undefined;
+                    }
                     var typeNameOrNamespaceName = parseJSDocIdentifierName();
-                    if (typeNameOrNamespaceName && parseOptional(23)) {
-                        var jsDocNamespaceNode = createNode(239, pos);
+                    if (parseOptional(23 /* DotToken */)) {
+                        var jsDocNamespaceNode = createNode(239 /* ModuleDeclaration */, pos);
                         if (nested) {
-                            jsDocNamespaceNode.flags |= 4;
+                            jsDocNamespaceNode.flags |= 4 /* NestedNamespace */;
                         }
                         jsDocNamespaceNode.name = typeNameOrNamespaceName;
-                        jsDocNamespaceNode.body = parseJSDocTypeNameWithNamespace(true);
+                        jsDocNamespaceNode.body = parseJSDocTypeNameWithNamespace(/*nested*/ true);
                         return finishNode(jsDocNamespaceNode);
                     }
-                    if (typeNameOrNamespaceName && nested) {
+                    if (nested) {
                         typeNameOrNamespaceName.isInJSDocNamespace = true;
                     }
                     return typeNameOrNamespaceName;
                 }
                 function parseCallbackTag(atToken, tagName, indent) {
-                    var callbackTag = createNode(292, atToken.pos);
+                    var callbackTag = createNode(292 /* JSDocCallbackTag */, atToken.pos);
                     callbackTag.atToken = atToken;
                     callbackTag.tagName = tagName;
                     callbackTag.fullName = parseJSDocTypeNameWithNamespace();
@@ -18117,15 +21078,15 @@ var ts;
                     callbackTag.comment = parseTagComments(indent);
                     var child;
                     var start = scanner.getStartPos();
-                    var jsdocSignature = createNode(288, start);
+                    var jsdocSignature = createNode(288 /* JSDocSignature */, start);
                     jsdocSignature.parameters = [];
-                    while (child = tryParse(function () { return parseChildParameterOrPropertyTag(4); })) {
+                    while (child = tryParse(function () { return parseChildParameterOrPropertyTag(4 /* CallbackParameter */); })) {
                         jsdocSignature.parameters = ts.append(jsdocSignature.parameters, child);
                     }
                     var returnTag = tryParse(function () {
-                        if (parseOptionalJsdoc(57)) {
+                        if (parseOptionalJsdoc(57 /* AtToken */)) {
                             var tag = parseTag(indent);
-                            if (tag && tag.kind === 294) {
+                            if (tag && tag.kind === 294 /* JSDocReturnTag */) {
                                 return tag;
                             }
                         }
@@ -18160,65 +21121,62 @@ var ts;
                     return a.escapedText === b.escapedText;
                 }
                 function parseChildPropertyTag() {
-                    return parseChildParameterOrPropertyTag(1);
+                    return parseChildParameterOrPropertyTag(1 /* Property */);
                 }
                 function parseChildParameterOrPropertyTag(target, name) {
                     var canParseTag = true;
                     var seenAsterisk = false;
                     while (true) {
                         switch (nextJSDocToken()) {
-                            case 57:
+                            case 57 /* AtToken */:
                                 if (canParseTag) {
                                     var child = tryParseChildTag(target);
-                                    if (child && child.kind === 293 &&
-                                        target !== 4 &&
-                                        (ts.isIdentifier(child.name) || !escapedTextsEqual(name, child.name.left))) {
+                                    if (child && child.kind === 293 /* JSDocParameterTag */ &&
+                                        target !== 4 /* CallbackParameter */ &&
+                                        (ts.isIdentifier(child.name) || !escapedTextsEqual(name, child.name.left))) { // TODO: GH#18217
                                         return false;
                                     }
                                     return child;
                                 }
                                 seenAsterisk = false;
                                 break;
-                            case 4:
+                            case 4 /* NewLineTrivia */:
                                 canParseTag = true;
                                 seenAsterisk = false;
                                 break;
-                            case 39:
+                            case 39 /* AsteriskToken */:
                                 if (seenAsterisk) {
                                     canParseTag = false;
                                 }
                                 seenAsterisk = true;
                                 break;
-                            case 71:
+                            case 71 /* Identifier */:
                                 canParseTag = false;
                                 break;
-                            case 1:
+                            case 1 /* EndOfFileToken */:
                                 return false;
                         }
                     }
                 }
                 function tryParseChildTag(target) {
-                    ts.Debug.assert(token() === 57);
-                    var atToken = createNode(57);
+                    ts.Debug.assert(token() === 57 /* AtToken */);
+                    var atToken = createNode(57 /* AtToken */);
                     atToken.end = scanner.getTextPos();
                     nextJSDocToken();
                     var tagName = parseJSDocIdentifierName();
                     skipWhitespace();
-                    if (!tagName) {
-                        return false;
-                    }
                     var t;
                     switch (tagName.escapedText) {
                         case "type":
-                            return target === 1 && parseTypeTag(atToken, tagName);
+                            return target === 1 /* Property */ && parseTypeTag(atToken, tagName);
                         case "prop":
                         case "property":
-                            t = 1;
+                            t = 1 /* Property */;
                             break;
                         case "arg":
                         case "argument":
                         case "param":
-                            t = 2 | 4;
+                            t = 2 /* Parameter */ | 4 /* CallbackParameter */;
                             break;
                         default:
                             return false;
@@ -18226,33 +21184,30 @@ var ts;
                     if (!(target & t)) {
                         return false;
                     }
-                    var tag = parseParameterOrPropertyTag(atToken, tagName, target, undefined);
+                    var tag = parseParameterOrPropertyTag(atToken, tagName, target, /*indent*/ undefined);
                     tag.comment = parseTagComments(tag.end - tag.pos);
                     return tag;
                 }
                 function parseTemplateTag(atToken, tagName) {
+                    // the template tag looks like '@template {Constraint} T,U,V'
                     var constraint;
-                    if (token() === 17) {
+                    if (token() === 17 /* OpenBraceToken */) {
                         constraint = parseJSDocTypeExpression();
                     }
                     var typeParameters = [];
                     var typeParametersPos = getNodePos();
                     do {
                         skipWhitespace();
-                        var typeParameter = createNode(148);
-                        if (!ts.tokenIsIdentifierOrKeyword(token())) {
-                            parseErrorAtCurrentToken(ts.Diagnostics.Unexpected_token_A_type_parameter_name_was_expected_without_curly_braces);
-                            return undefined;
-                        }
-                        typeParameter.name = parseJSDocIdentifierName();
+                        var typeParameter = createNode(148 /* TypeParameter */);
+                        typeParameter.name = parseJSDocIdentifierName(ts.Diagnostics.Unexpected_token_A_type_parameter_name_was_expected_without_curly_braces);
                         skipWhitespace();
                         finishNode(typeParameter);
                         typeParameters.push(typeParameter);
-                    } while (parseOptionalJsdoc(26));
+                    } while (parseOptionalJsdoc(26 /* CommaToken */));
                     if (constraint) {
                         ts.first(typeParameters).constraint = constraint.type;
                     }
-                    var result = createNode(296, atToken.pos);
+                    var result = createNode(296 /* JSDocTemplateTag */, atToken.pos);
                     result.atToken = atToken;
                     result.tagName = tagName;
                     result.typeParameters = createNodeArray(typeParameters, typeParametersPos);
@@ -18270,33 +21225,29 @@ var ts;
                     return false;
                 }
                 function parseJSDocEntityName() {
-                    var entity = parseJSDocIdentifierName(true);
-                    if (parseOptional(21)) {
-                        parseExpected(22);
+                    var entity = parseJSDocIdentifierName();
+                    if (parseOptional(21 /* OpenBracketToken */)) {
+                        parseExpected(22 /* CloseBracketToken */);
+                        // Note that y[] is accepted as an entity name, but the postfix brackets are not saved for checking.
+                        // Technically usejsdoc.org requires them for specifying a property of a type equivalent to Array<{ x: ...}>
+                        // but it's not worth it to enforce that restriction.
                     }
-                    while (parseOptional(23)) {
-                        var name = parseJSDocIdentifierName(true);
-                        if (parseOptional(21)) {
-                            parseExpected(22);
+                    while (parseOptional(23 /* DotToken */)) {
+                        var name = parseJSDocIdentifierName();
+                        if (parseOptional(21 /* OpenBracketToken */)) {
+                            parseExpected(22 /* CloseBracketToken */);
                         }
                         entity = createQualifiedName(entity, name);
                     }
                     return entity;
                 }
-                function parseJSDocIdentifierName(createIfMissing) {
-                    if (createIfMissing === void 0) { createIfMissing = false; }
+                function parseJSDocIdentifierName(message) {
                     if (!ts.tokenIsIdentifierOrKeyword(token())) {
-                        if (createIfMissing) {
-                            return createMissingNode(71, true, ts.Diagnostics.Identifier_expected);
-                        }
-                        else {
-                            parseErrorAtCurrentToken(ts.Diagnostics.Identifier_expected);
-                            return undefined;
-                        }
+                        return createMissingNode(71 /* Identifier */, /*reportAtCurrentPosition*/ !message, message || ts.Diagnostics.Identifier_expected);
                     }
                     var pos = scanner.getTokenPos();
                     var end = scanner.getTextPos();
-                    var result = createNode(71, pos);
+                    var result = createNode(71 /* Identifier */, pos);
                     result.escapedText = ts.escapeLeadingUnderscores(scanner.getTokenText());
                     finishNode(result, end);
                     nextJSDocToken();
@@ -18309,27 +21260,72 @@ var ts;
     var IncrementalParser;
     (function (IncrementalParser) {
         function updateSourceFile(sourceFile, newText, textChangeRange, aggressiveChecks) {
-            aggressiveChecks = aggressiveChecks || ts.Debug.shouldAssert(2);
+            aggressiveChecks = aggressiveChecks || ts.Debug.shouldAssert(2 /* Aggressive */);
             checkChangeRange(sourceFile, newText, textChangeRange, aggressiveChecks);
             if (ts.textChangeRangeIsUnchanged(textChangeRange)) {
+                // if the text didn't change, then we can just return our current source file as-is.
                 return sourceFile;
             }
             if (sourceFile.statements.length === 0) {
-                return Parser.parseSourceFile(sourceFile.fileName, newText, sourceFile.languageVersion, undefined, true, sourceFile.scriptKind);
+                // If we don't have any statements in the current source file, then there's no real
+                // way to incrementally parse.  So just do a full parse instead.
+                return Parser.parseSourceFile(sourceFile.fileName, newText, sourceFile.languageVersion, /*syntaxCursor*/ undefined, /*setParentNodes*/ true, sourceFile.scriptKind);
             }
+            // Make sure we're not trying to incrementally update a source file more than once.  Once
+            // we do an update the original source file is considered unusable from that point onwards.
+            //
+            // This is because we do incremental parsing in-place.  i.e. we take nodes from the old
+            // tree and give them new positions and parents.  From that point on, trusting the old
+            // tree at all is not possible as far too much of it may violate invariants.
             var incrementalSourceFile = sourceFile;
             ts.Debug.assert(!incrementalSourceFile.hasBeenIncrementallyParsed);
             incrementalSourceFile.hasBeenIncrementallyParsed = true;
             var oldText = sourceFile.text;
             var syntaxCursor = createSyntaxCursor(sourceFile);
+            // Make the actual change larger so that we know to reparse anything whose lookahead
+            // might have intersected the change.
             var changeRange = extendToAffectedRange(sourceFile, textChangeRange);
             checkChangeRange(sourceFile, newText, changeRange, aggressiveChecks);
+            // Ensure that extending the affected range only moved the start of the change range
+            // earlier in the file.
             ts.Debug.assert(changeRange.span.start <= textChangeRange.span.start);
             ts.Debug.assert(ts.textSpanEnd(changeRange.span) === ts.textSpanEnd(textChangeRange.span));
             ts.Debug.assert(ts.textSpanEnd(ts.textChangeRangeNewSpan(changeRange)) === ts.textSpanEnd(ts.textChangeRangeNewSpan(textChangeRange)));
+            // The is the amount the nodes after the edit range need to be adjusted.  It can be
+            // positive (if the edit added characters), negative (if the edit deleted characters)
+            // or zero (if this was a pure overwrite with nothing added/removed).
             var delta = ts.textChangeRangeNewSpan(changeRange).length - changeRange.span.length;
+            // If we added or removed characters during the edit, then we need to go and adjust all
+            // the nodes after the edit.  Those nodes may move forward (if we inserted chars) or they
+            // may move backward (if we deleted chars).
+            //
+            // Doing this helps us out in two ways.  First, it means that any nodes/tokens we want
+            // to reuse are already at the appropriate position in the new text.  That way when we
+            // reuse them, we don't have to figure out if they need to be adjusted.  Second, it makes
+            // it very easy to determine if we can reuse a node.  If the node's position is at where
+            // we are in the text, then we can reuse it.  Otherwise we can't.  If the node's position
+            // is ahead of us, then we'll need to rescan tokens.  If the node's position is behind
+            // us, then we'll need to skip it or crumble it as appropriate
+            //
+            // We will also adjust the positions of nodes that intersect the change range as well.
+            // By doing this, we ensure that all the positions in the old tree are consistent, not
+            // just the positions of nodes entirely before/after the change range.  By being
+            // consistent, we can then easily map from positions to nodes in the old tree easily.
+            //
+            // Also, mark any syntax elements that intersect the changed span.  We know, up front,
+            // that we cannot reuse these elements.
             updateTokenPositionsAndMarkElements(incrementalSourceFile, changeRange.span.start, ts.textSpanEnd(changeRange.span), ts.textSpanEnd(ts.textChangeRangeNewSpan(changeRange)), delta, oldText, newText, aggressiveChecks);
-            var result = Parser.parseSourceFile(sourceFile.fileName, newText, sourceFile.languageVersion, syntaxCursor, true, sourceFile.scriptKind);
+            // Now that we've set up our internal incremental state just proceed and parse the
+            // source file in the normal fashion.  When possible the parser will retrieve and
+            // reuse nodes from the old tree.
+            //
+            // Note: passing in 'true' for setNodeParents is very important.  When incrementally
+            // parsing, we will be reusing nodes from the old tree, and placing it into new
+            // parents.  If we don't set the parents now, we'll end up with an observably
+            // inconsistent tree.  Setting the parents on the new tree should be very fast.  We
+            // will immediately bail out of walking any subtrees when we can see that their parents
+            // are already correct.
+            var result = Parser.parseSourceFile(sourceFile.fileName, newText, sourceFile.languageVersion, syntaxCursor, /*setParentNodes*/ true, sourceFile.scriptKind);
             return result;
         }
         IncrementalParser.updateSourceFile = updateSourceFile;
@@ -18346,6 +21342,8 @@ var ts;
                 if (aggressiveChecks && shouldCheckNode(node)) {
                     text = oldText.substring(node.pos, node.end);
                 }
+                // Ditch any existing LS children we may have created.  This way we can avoid
+                // moving them forward.
                 if (node._children) {
                     node._children = undefined;
                 }
@@ -18367,17 +21365,17 @@ var ts;
                 array._children = undefined;
                 array.pos += delta;
                 array.end += delta;
-                for (var _i = 0, array_8 = array; _i < array_8.length; _i++) {
-                    var node = array_8[_i];
+                for (var _i = 0, array_1 = array; _i < array_1.length; _i++) {
+                    var node = array_1[_i];
                     visitNode(node);
                 }
             }
         }
         function shouldCheckNode(node) {
             switch (node.kind) {
-                case 9:
-                case 8:
-                case 71:
+                case 9 /* StringLiteral */:
+                case 8 /* NumericLiteral */:
+                case 71 /* Identifier */:
                     return true;
             }
             return false;
@@ -18386,11 +21384,63 @@ var ts;
             ts.Debug.assert(element.end >= changeStart, "Adjusting an element that was entirely before the change range");
             ts.Debug.assert(element.pos <= changeRangeOldEnd, "Adjusting an element that was entirely after the change range");
             ts.Debug.assert(element.pos <= element.end);
+            // We have an element that intersects the change range in some way.  It may have its
+            // start, or its end (or both) in the changed range.  We want to adjust any part
+            // that intersects such that the final tree is in a consistent state.  i.e. all
+            // children have spans within the span of their parent, and all siblings are ordered
+            // properly.
+            // We may need to update both the 'pos' and the 'end' of the element.
+            // If the 'pos' is before the start of the change, then we don't need to touch it.
+            // If it isn't, then the 'pos' must be inside the change.  How we update it will
+            // depend if delta is positive or negative. If delta is positive then we have
+            // something like:
+            //
+            //  -------------------AAA-----------------
+            //  -------------------BBBCCCCCCC-----------------
+            //
+            // In this case, we consider any node that started in the change range to still be
+            // starting at the same position.
+            //
+            // however, if the delta is negative, then we instead have something like this:
+            //
+            //  -------------------XXXYYYYYYY-----------------
+            //  -------------------ZZZ-----------------
+            //
+            // In this case, any element that started in the 'X' range will keep its position.
+            // However any element that started after that will have their pos adjusted to be
+            // at the end of the new range.  i.e. any node that started in the 'Y' range will
+            // be adjusted to have their start at the end of the 'Z' range.
+            //
+            // The element will keep its position if possible.  Or Move backward to the new-end
+            // if it's in the 'Y' range.
             element.pos = Math.min(element.pos, changeRangeNewEnd);
+            // If the 'end' is after the change range, then we always adjust it by the delta
+            // amount.  However, if the end is in the change range, then how we adjust it
+            // will depend on if delta is positive or negative.  If delta is positive then we
+            // have something like:
+            //
+            //  -------------------AAA-----------------
+            //  -------------------BBBCCCCCCC-----------------
+            //
+            // In this case, we consider any node that ended inside the change range to keep its
+            // end position.
+            //
+            // however, if the delta is negative, then we instead have something like this:
+            //
+            //  -------------------XXXYYYYYYY-----------------
+            //  -------------------ZZZ-----------------
+            //
+            // In this case, any element that ended in the 'X' range will keep its position.
+            // However any element that ended after that will have their pos adjusted to be
+            // at the end of the new range.  i.e. any node that ended in the 'Y' range will
+            // be adjusted to have their end at the end of the 'Z' range.
             if (element.end >= changeRangeOldEnd) {
+                // Element ends after the change range.  Always adjust the end pos.
                 element.end += delta;
             }
             else {
+                // Element ends in the change range.  The element will keep its position if
+                // possible. Or Move backward to the new-end if it's in the 'Y' range.
                 element.end = Math.min(element.end, changeRangeNewEnd);
             }
             ts.Debug.assert(element.pos <= element.end);
@@ -18422,13 +21472,19 @@ var ts;
             function visitNode(child) {
                 ts.Debug.assert(child.pos <= child.end);
                 if (child.pos > changeRangeOldEnd) {
-                    moveElementEntirelyPastChangeRange(child, false, delta, oldText, newText, aggressiveChecks);
+                    // Node is entirely past the change range.  We need to move both its pos and
+                    // end, forward or backward appropriately.
+                    moveElementEntirelyPastChangeRange(child, /*isArray*/ false, delta, oldText, newText, aggressiveChecks);
                     return;
                 }
+                // Check if the element intersects the change range.  If it does, then it is not
+                // reusable.  Also, we'll need to recurse to see what constituent portions we may
+                // be able to use.
                 var fullEnd = child.end;
                 if (fullEnd >= changeStart) {
                     child.intersectsChange = true;
                     child._children = undefined;
+                    // Adjust the pos or end (or both) of the intersecting element accordingly.
                     adjustIntersectingElement(child, changeStart, changeRangeOldEnd, changeRangeNewEnd, delta);
                     forEachChild(child, visitNode, visitArray);
                     if (ts.hasJSDocNodes(child)) {
@@ -18440,31 +21496,52 @@ var ts;
                     checkNodePositions(child, aggressiveChecks);
                     return;
                 }
+                // Otherwise, the node is entirely before the change range.  No need to do anything with it.
                 ts.Debug.assert(fullEnd < changeStart);
             }
             function visitArray(array) {
                 ts.Debug.assert(array.pos <= array.end);
                 if (array.pos > changeRangeOldEnd) {
-                    moveElementEntirelyPastChangeRange(array, true, delta, oldText, newText, aggressiveChecks);
+                    // Array is entirely after the change range.  We need to move it, and move any of
+                    // its children.
+                    moveElementEntirelyPastChangeRange(array, /*isArray*/ true, delta, oldText, newText, aggressiveChecks);
                     return;
                 }
+                // Check if the element intersects the change range.  If it does, then it is not
+                // reusable.  Also, we'll need to recurse to see what constituent portions we may
+                // be able to use.
                 var fullEnd = array.end;
                 if (fullEnd >= changeStart) {
                     array.intersectsChange = true;
                     array._children = undefined;
+                    // Adjust the pos or end (or both) of the intersecting array accordingly.
                     adjustIntersectingElement(array, changeStart, changeRangeOldEnd, changeRangeNewEnd, delta);
-                    for (var _i = 0, array_9 = array; _i < array_9.length; _i++) {
-                        var node = array_9[_i];
+                    for (var _i = 0, array_2 = array; _i < array_2.length; _i++) {
+                        var node = array_2[_i];
                         visitNode(node);
                     }
                     return;
                 }
+                // Otherwise, the array is entirely before the change range.  No need to do anything with it.
                 ts.Debug.assert(fullEnd < changeStart);
             }
         }
         function extendToAffectedRange(sourceFile, changeRange) {
+            // Consider the following code:
+            //      void foo() { /; }
+            //
+            // If the text changes with an insertion of / just before the semicolon then we end up with:
+            //      void foo() { //; }
+            //
+            // If we were to just use the changeRange a is, then we would not rescan the { token
+            // (as it does not intersect the actual original change range).  Because an edit may
+            // change the token touching it, we actually need to look back *at least* one token so
+            // that the prior token sees that change.
             var maxLookahead = 1;
             var start = changeRange.span.start;
+            // the first iteration aligns us with the change start. subsequent iteration move us to
+            // the left by maxLookahead tokens.  We only need to do this as long as we're not at the
+            // start of the tree.
             for (var i = 0; start > 0 && i <= maxLookahead; i++) {
                 var nearestNode = findNearestNodeStartingBeforeOrAtPosition(sourceFile, start);
                 ts.Debug.assert(nearestNode.pos <= start);
@@ -18499,23 +21576,54 @@ var ts;
             }
             function visit(child) {
                 if (ts.nodeIsMissing(child)) {
+                    // Missing nodes are effectively invisible to us.  We never even consider them
+                    // When trying to find the nearest node before us.
                     return;
                 }
+                // If the child intersects this position, then this node is currently the nearest
+                // node that starts before the position.
                 if (child.pos <= position) {
                     if (child.pos >= bestResult.pos) {
+                        // This node starts before the position, and is closer to the position than
+                        // the previous best node we found.  It is now the new best node.
                         bestResult = child;
                     }
+                    // Now, the node may overlap the position, or it may end entirely before the
+                    // position.  If it overlaps with the position, then either it, or one of its
+                    // children must be the nearest node before the position.  So we can just
+                    // recurse into this child to see if we can find something better.
                     if (position < child.end) {
+                        // The nearest node is either this child, or one of the children inside
+                        // of it.  We've already marked this child as the best so far.  Recurse
+                        // in case one of the children is better.
                         forEachChild(child, visit);
+                        // Once we look at the children of this node, then there's no need to
+                        // continue any further.
                         return true;
                     }
                     else {
                         ts.Debug.assert(child.end <= position);
+                        // The child ends entirely before this position.  Say you have the following
+                        // (where $ is the position)
+                        //
+                        //      <complex expr 1> ? <complex expr 2> $ : <...> <...>
+                        //
+                        // We would want to find the nearest preceding node in "complex expr 2".
+                        // To support that, we keep track of this node, and once we're done searching
+                        // for a best node, we recurse down this node to see if we can find a good
+                        // result in it.
+                        //
+                        // This approach allows us to quickly skip over nodes that are entirely
+                        // before the position, while still allowing us to find any nodes in the
+                        // last one that might be what we want.
                         lastNodeEntirelyBeforePosition = child;
                     }
                 }
                 else {
                     ts.Debug.assert(child.pos > position);
+                    // We're now at a node that is entirely past the position we're searching for.
+                    // This node (and all following nodes) could never contribute to the result,
+                    // so just skip them by returning 'true' here.
                     return true;
                 }
             }
@@ -18524,7 +21632,7 @@ var ts;
             var oldText = sourceFile.text;
             if (textChangeRange) {
                 ts.Debug.assert((oldText.length - textChangeRange.span.length + textChangeRange.newLength) === newText.length);
-                if (aggressiveChecks || ts.Debug.shouldAssert(3)) {
+                if (aggressiveChecks || ts.Debug.shouldAssert(3 /* VeryAggressive */)) {
                     var oldTextPrefix = oldText.substr(0, textChangeRange.span.start);
                     var newTextPrefix = newText.substr(0, textChangeRange.span.start);
                     ts.Debug.assert(oldTextPrefix === newTextPrefix);
@@ -18539,42 +21647,68 @@ var ts;
             var currentArrayIndex = 0;
             ts.Debug.assert(currentArrayIndex < currentArray.length);
             var current = currentArray[currentArrayIndex];
-            var lastQueriedPosition = -1;
+            var lastQueriedPosition = -1 /* Value */;
             return {
                 currentNode: function (position) {
+                    // Only compute the current node if the position is different than the last time
+                    // we were asked.  The parser commonly asks for the node at the same position
+                    // twice.  Once to know if can read an appropriate list element at a certain point,
+                    // and then to actually read and consume the node.
                     if (position !== lastQueriedPosition) {
+                        // Much of the time the parser will need the very next node in the array that
+                        // we just returned a node from.So just simply check for that case and move
+                        // forward in the array instead of searching for the node again.
                         if (current && current.end === position && currentArrayIndex < (currentArray.length - 1)) {
                             currentArrayIndex++;
                             current = currentArray[currentArrayIndex];
                         }
+                        // If we don't have a node, or the node we have isn't in the right position,
+                        // then try to find a viable node at the position requested.
                         if (!current || current.pos !== position) {
                             findHighestListElementThatStartsAtPosition(position);
                         }
                     }
+                    // Cache this query so that we don't do any extra work if the parser calls back
+                    // into us.  Note: this is very common as the parser will make pairs of calls like
+                    // 'isListElement -> parseListElement'.  If we were unable to find a node when
+                    // called with 'isListElement', we don't want to redo the work when parseListElement
+                    // is called immediately after.
                     lastQueriedPosition = position;
+                    // Either we don'd have a node, or we have a node at the position being asked for.
                     ts.Debug.assert(!current || current.pos === position);
                     return current;
                 }
             };
+            // Finds the highest element in the tree we can find that starts at the provided position.
+            // The element must be a direct child of some node list in the tree.  This way after we
+            // return it, we can easily return its next sibling in the list.
             function findHighestListElementThatStartsAtPosition(position) {
+                // Clear out any cached state about the last node we found.
                 currentArray = undefined;
-                currentArrayIndex = -1;
+                currentArrayIndex = -1 /* Value */;
                 current = undefined;
+                // Recurse into the source file to find the highest node at this position.
                 forEachChild(sourceFile, visitNode, visitArray);
                 return;
                 function visitNode(node) {
                     if (position >= node.pos && position < node.end) {
+                        // Position was within this node.  Keep searching deeper to find the node.
                         forEachChild(node, visitNode, visitArray);
+                        // don't proceed any further in the search.
                         return true;
                     }
+                    // position wasn't in this node, have to keep searching.
                     return false;
                 }
                 function visitArray(array) {
                     if (position >= array.pos && position < array.end) {
+                        // position was in this array.  Search through this array to see if we find a
+                        // viable element.
                         for (var i = 0; i < array.length; i++) {
                             var child = array[i];
                             if (child) {
                                 if (child.pos === position) {
+                                    // Found the right node.  We're done.
                                     currentArray = array;
                                     currentArrayIndex = i;
                                     current = child;
@@ -18582,6 +21716,8 @@ var ts;
                                 }
                                 else {
                                     if (child.pos < position && position < child.end) {
+                                        // Position in somewhere within this child.  Search in it and
+                                        // stop searching in this array.
                                         forEachChild(child, visitNode, visitArray);
                                         return true;
                                     }
@@ -18589,6 +21725,7 @@ var ts;
                             }
                         }
                     }
+                    // position wasn't in this array, have to keep searching.
                     return false;
                 }
             }
@@ -18599,11 +21736,15 @@ var ts;
         })(InvalidPosition || (InvalidPosition = {}));
     })(IncrementalParser || (IncrementalParser = {}));
     function isDeclarationFileName(fileName) {
-        return ts.fileExtensionIs(fileName, ".d.ts");
+        return ts.fileExtensionIs(fileName, ".d.ts" /* Dts */);
     }
+    /*@internal*/
     function processCommentPragmas(context, sourceText) {
-        var triviaScanner = ts.createScanner(context.languageVersion, false, 0, sourceText);
+        var triviaScanner = ts.createScanner(context.languageVersion, /*skipTrivia*/ false, 0 /* Standard */, sourceText);
         var pragmas = [];
+        // Keep scanning all the leading trivia in the file until we get to something that
+        // isn't trivia.  Any single line comment will be analyzed to see if it is a
+        // reference comment.
         while (true) {
             var kind = triviaScanner.scan();
             if (!ts.isTrivia(kind)) {
@@ -18620,7 +21761,7 @@ var ts;
         context.pragmas = ts.createMap();
         for (var _i = 0, pragmas_1 = pragmas; _i < pragmas_1.length; _i++) {
             var pragma = pragmas_1[_i];
-            if (context.pragmas.has(pragma.name)) {
+            if (context.pragmas.has(pragma.name)) { // TODO: GH#18217
                 var currentValue = context.pragmas.get(pragma.name);
                 if (currentValue instanceof Array) {
                     currentValue.push(pragma.args);
@@ -18634,24 +21775,33 @@ var ts;
         }
     }
     ts.processCommentPragmas = processCommentPragmas;
+    /*@internal*/
     function processPragmasIntoFields(context, reportDiagnostic) {
         context.checkJsDirective = undefined;
         context.referencedFiles = [];
         context.typeReferenceDirectives = [];
+        context.libReferenceDirectives = [];
         context.amdDependencies = [];
         context.hasNoDefaultLib = false;
         context.pragmas.forEach(function (entryOrList, key) {
+            // TODO: The below should be strongly type-guarded and not need casts/explicit annotations, since entryOrList is related to
+            // key and key is constrained to a union; but it's not (see GH#21483 for at least partial fix) :(
             switch (key) {
                 case "reference": {
                     var referencedFiles_1 = context.referencedFiles;
                     var typeReferenceDirectives_1 = context.typeReferenceDirectives;
+                    var libReferenceDirectives_1 = context.libReferenceDirectives;
                     ts.forEach(ts.toArray(entryOrList), function (arg) {
+                        // TODO: GH#18217
                         if (arg.arguments["no-default-lib"]) {
                             context.hasNoDefaultLib = true;
                         }
                         else if (arg.arguments.types) {
                             typeReferenceDirectives_1.push({ pos: arg.arguments.types.pos, end: arg.arguments.types.end, fileName: arg.arguments.types.value });
                         }
+                        else if (arg.arguments.lib) {
+                            libReferenceDirectives_1.push({ pos: arg.arguments.lib.pos, end: arg.arguments.lib.end, fileName: arg.arguments.lib.value });
+                        }
                         else if (arg.arguments.path) {
                             referencedFiles_1.push({ pos: arg.arguments.path.pos, end: arg.arguments.path.end, fileName: arg.arguments.path.value });
                         }
@@ -18662,7 +21812,7 @@ var ts;
                     break;
                 }
                 case "amd-dependency": {
-                    context.amdDependencies = ts.map(ts.toArray(entryOrList), function (x) { return ({ name: x.arguments.name, path: x.arguments.path }); });
+                    context.amdDependencies = ts.map(ts.toArray(entryOrList), function (x) { return ({ name: x.arguments.name, path: x.arguments.path }); }); // TODO: GH#18217
                     break;
                 }
                 case "amd-module": {
@@ -18670,6 +21820,7 @@ var ts;
                         for (var _i = 0, entryOrList_1 = entryOrList; _i < entryOrList_1.length; _i++) {
                             var entry = entryOrList_1[_i];
                             if (context.moduleName) {
+                                // TODO: It's probably fine to issue this diagnostic on all instances of the pragma
                                 reportDiagnostic(entry.range.pos, entry.range.end - entry.range.pos, ts.Diagnostics.An_AMD_module_cannot_have_multiple_name_assignments);
                             }
                             context.moduleName = entry.arguments.name;
@@ -18682,8 +21833,9 @@ var ts;
                 }
                 case "ts-nocheck":
                 case "ts-check": {
+                    // _last_ of either nocheck or check in a file is the "winner"
                     ts.forEach(ts.toArray(entryOrList), function (entry) {
-                        if (!context.checkJsDirective || entry.range.pos > context.checkJsDirective.pos) {
+                        if (!context.checkJsDirective || entry.range.pos > context.checkJsDirective.pos) { // TODO: GH#18217
                             context.checkJsDirective = {
                                 enabled: key === "ts-check",
                                 end: entry.range.end,
@@ -18693,8 +21845,8 @@ var ts;
                     });
                     break;
                 }
-                case "jsx": return;
-                default: ts.Debug.fail("Unhandled pragma kind");
+                case "jsx": return; // Accessed directly
+                default: ts.Debug.fail("Unhandled pragma kind"); // Can this be made into an assertNever in the future?
             }
         });
     }
@@ -18711,11 +21863,11 @@ var ts;
     var tripleSlashXMLCommentStartRegEx = /^\/\/\/\s*<(\S+)\s.*?\/>/im;
     var singleLinePragmaRegEx = /^\/\/\/?\s*@(\S+)\s*(.*)\s*$/im;
     function extractPragmas(pragmas, range, text) {
-        var tripleSlash = range.kind === 2 && tripleSlashXMLCommentStartRegEx.exec(text);
+        var tripleSlash = range.kind === 2 /* SingleLineCommentTrivia */ && tripleSlashXMLCommentStartRegEx.exec(text);
         if (tripleSlash) {
-            var name = tripleSlash[1].toLowerCase();
+            var name = tripleSlash[1].toLowerCase(); // Technically unsafe cast, but we do it so the below check to make it safe typechecks
             var pragma = ts.commentPragmas[name];
-            if (!pragma || !(pragma.kind & 1)) {
+            if (!pragma || !(pragma.kind & 1 /* TripleSlashXML */)) {
                 return;
             }
             if (pragma.args) {
@@ -18725,7 +21877,7 @@ var ts;
                     var matcher = getNamedArgRegEx(arg.name);
                     var matchResult = matcher.exec(text);
                     if (!matchResult && !arg.optional) {
-                        return;
+                        return; // Missing required argument, don't parse
                     }
                     else if (matchResult) {
                         if (arg.captureSpan) {
@@ -18748,30 +21900,30 @@ var ts;
             }
             return;
         }
-        var singleLine = range.kind === 2 && singleLinePragmaRegEx.exec(text);
+        var singleLine = range.kind === 2 /* SingleLineCommentTrivia */ && singleLinePragmaRegEx.exec(text);
         if (singleLine) {
-            return addPragmaForMatch(pragmas, range, 2, singleLine);
+            return addPragmaForMatch(pragmas, range, 2 /* SingleLine */, singleLine);
         }
-        if (range.kind === 3) {
-            var multiLinePragmaRegEx = /\s*@(\S+)\s*(.*)\s*$/gim;
+        if (range.kind === 3 /* MultiLineCommentTrivia */) {
+            var multiLinePragmaRegEx = /\s*@(\S+)\s*(.*)\s*$/gim; // Defined inline since it uses the "g" flag, which keeps a persistent index (for iterating)
             var multiLineMatch = void 0;
             while (multiLineMatch = multiLinePragmaRegEx.exec(text)) {
-                addPragmaForMatch(pragmas, range, 4, multiLineMatch);
+                addPragmaForMatch(pragmas, range, 4 /* MultiLine */, multiLineMatch);
             }
         }
     }
     function addPragmaForMatch(pragmas, range, kind, match) {
         if (!match)
             return;
-        var name = match[1].toLowerCase();
+        var name = match[1].toLowerCase(); // Technically unsafe cast, but we do it so they below check to make it safe typechecks
         var pragma = ts.commentPragmas[name];
         if (!pragma || !(pragma.kind & kind)) {
             return;
         }
-        var args = match[2];
+        var args = match[2]; // Split on spaces and match up positionally with definition
         var argument = getNamedPragmaArguments(pragma, args);
         if (argument === "fail")
-            return;
+            return; // Missing required argument, fail to parse it
         pragmas.push({ name: name, args: { arguments: argument, range: range } });
         return;
     }
@@ -18794,16 +21946,20 @@ var ts;
         }
         return argMap;
     }
+    /** @internal */
     function tagNamesAreEquivalent(lhs, rhs) {
         if (lhs.kind !== rhs.kind) {
             return false;
         }
-        if (lhs.kind === 71) {
+        if (lhs.kind === 71 /* Identifier */) {
             return lhs.escapedText === rhs.escapedText;
         }
-        if (lhs.kind === 99) {
+        if (lhs.kind === 99 /* ThisKeyword */) {
             return true;
         }
+        // If we are at this statement then we must have PropertyAccessExpression and because tag name in Jsx element can only
+        // take forms of JsxTagNameExpression which includes an identifier, "this" expression, or another propertyAccessExpression
+        // it is safe to case the expression property as such. See parseJsxElementName for how we parse tag name in Jsx element
         return lhs.name.escapedText === rhs.name.escapedText &&
             tagNamesAreEquivalent(lhs.expression, rhs.expression);
     }
@@ -18811,3040 +21967,2271 @@ var ts;
 })(ts || (ts = {}));
 var ts;
 (function (ts) {
-    var ModuleInstanceState;
-    (function (ModuleInstanceState) {
-        ModuleInstanceState[ModuleInstanceState["NonInstantiated"] = 0] = "NonInstantiated";
-        ModuleInstanceState[ModuleInstanceState["Instantiated"] = 1] = "Instantiated";
-        ModuleInstanceState[ModuleInstanceState["ConstEnumOnly"] = 2] = "ConstEnumOnly";
-    })(ModuleInstanceState = ts.ModuleInstanceState || (ts.ModuleInstanceState = {}));
-    function getModuleInstanceState(node) {
-        return node.body ? getModuleInstanceStateWorker(node.body) : 1;
-    }
-    ts.getModuleInstanceState = getModuleInstanceState;
-    function getModuleInstanceStateWorker(node) {
-        switch (node.kind) {
-            case 236:
-            case 237:
-                return 0;
-            case 238:
-                if (ts.isConst(node)) {
-                    return 2;
-                }
-                break;
-            case 244:
-            case 243:
-                if (!(ts.hasModifier(node, 1))) {
-                    return 0;
-                }
-                break;
-            case 240: {
-                var state_1 = 0;
-                ts.forEachChild(node, function (n) {
-                    var childState = getModuleInstanceStateWorker(n);
-                    switch (childState) {
-                        case 0:
-                            return;
-                        case 2:
-                            state_1 = 2;
-                            return;
-                        case 1:
-                            state_1 = 1;
-                            return true;
-                        default:
-                            ts.Debug.assertNever(childState);
-                    }
-                });
-                return state_1;
-            }
-            case 239:
-                return getModuleInstanceState(node);
-            case 71:
-                if (node.isInJSDocNamespace) {
-                    return 0;
-                }
+    /* @internal */
+    ts.compileOnSaveCommandLineOption = { name: "compileOnSave", type: "boolean" };
+    // NOTE: The order here is important to default lib ordering as entries will have the same
+    //       order in the generated program (see `getDefaultLibPriority` in program.ts). This
+    //       order also affects overload resolution when a type declared in one lib is
+    //       augmented in another lib.
+    var libEntries = [
+        // JavaScript only
+        ["es5", "lib.es5.d.ts"],
+        ["es6", "lib.es2015.d.ts"],
+        ["es2015", "lib.es2015.d.ts"],
+        ["es7", "lib.es2016.d.ts"],
+        ["es2016", "lib.es2016.d.ts"],
+        ["es2017", "lib.es2017.d.ts"],
+        ["es2018", "lib.es2018.d.ts"],
+        ["esnext", "lib.esnext.d.ts"],
+        // Host only
+        ["dom", "lib.dom.d.ts"],
+        ["dom.iterable", "lib.dom.iterable.d.ts"],
+        ["webworker", "lib.webworker.d.ts"],
+        ["webworker.importscripts", "lib.webworker.importscripts.d.ts"],
+        ["scripthost", "lib.scripthost.d.ts"],
+        // ES2015 Or ESNext By-feature options
+        ["es2015.core", "lib.es2015.core.d.ts"],
+        ["es2015.collection", "lib.es2015.collection.d.ts"],
+        ["es2015.generator", "lib.es2015.generator.d.ts"],
+        ["es2015.iterable", "lib.es2015.iterable.d.ts"],
+        ["es2015.promise", "lib.es2015.promise.d.ts"],
+        ["es2015.proxy", "lib.es2015.proxy.d.ts"],
+        ["es2015.reflect", "lib.es2015.reflect.d.ts"],
+        ["es2015.symbol", "lib.es2015.symbol.d.ts"],
+        ["es2015.symbol.wellknown", "lib.es2015.symbol.wellknown.d.ts"],
+        ["es2016.array.include", "lib.es2016.array.include.d.ts"],
+        ["es2017.object", "lib.es2017.object.d.ts"],
+        ["es2017.sharedmemory", "lib.es2017.sharedmemory.d.ts"],
+        ["es2017.string", "lib.es2017.string.d.ts"],
+        ["es2017.intl", "lib.es2017.intl.d.ts"],
+        ["es2017.typedarrays", "lib.es2017.typedarrays.d.ts"],
+        ["es2018.intl", "lib.es2018.intl.d.ts"],
+        ["es2018.promise", "lib.es2018.promise.d.ts"],
+        ["es2018.regexp", "lib.es2018.regexp.d.ts"],
+        ["esnext.array", "lib.esnext.array.d.ts"],
+        ["esnext.symbol", "lib.esnext.symbol.d.ts"],
+        ["esnext.asynciterable", "lib.esnext.asynciterable.d.ts"],
+    ];
+    /**
+     * An array of supported "lib" reference file names used to determine the order for inclusion
+     * when referenced, as well as for spelling suggestions. This ensures the correct ordering for
+     * overload resolution when a type declared in one lib is extended by another.
+     */
+    /* @internal */
+    ts.libs = libEntries.map(function (entry) { return entry[0]; });
+    /**
+     * A map of lib names to lib files. This map is used both for parsing the "lib" command line
+     * option as well as for resolving lib reference directives.
+     */
+    /* @internal */
+    ts.libMap = ts.createMapFromEntries(libEntries);
+    /* @internal */
+    ts.optionDeclarations = [
+        // CommandLine only options
+        {
+            name: "help",
+            shortName: "h",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Command_line_Options,
+            description: ts.Diagnostics.Print_this_message,
+        },
+        {
+            name: "help",
+            shortName: "?",
+            type: "boolean"
+        },
+        {
+            name: "all",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Command_line_Options,
+            description: ts.Diagnostics.Show_all_compiler_options,
+        },
+        {
+            name: "version",
+            shortName: "v",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Command_line_Options,
+            description: ts.Diagnostics.Print_the_compiler_s_version,
+        },
+        {
+            name: "init",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Command_line_Options,
+            description: ts.Diagnostics.Initializes_a_TypeScript_project_and_creates_a_tsconfig_json_file,
+        },
+        {
+            name: "project",
+            shortName: "p",
+            type: "string",
+            isFilePath: true,
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Command_line_Options,
+            paramType: ts.Diagnostics.FILE_OR_DIRECTORY,
+            description: ts.Diagnostics.Compile_the_project_given_the_path_to_its_configuration_file_or_to_a_folder_with_a_tsconfig_json,
+        },
+        {
+            name: "build",
+            type: "boolean",
+            shortName: "b",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Command_line_Options,
+            description: ts.Diagnostics.Build_one_or_more_projects_and_their_dependencies_if_out_of_date
+        },
+        {
+            name: "pretty",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Command_line_Options,
+            description: ts.Diagnostics.Stylize_errors_and_messages_using_color_and_context_experimental
+        },
+        {
+            name: "preserveWatchOutput",
+            type: "boolean",
+            showInSimplifiedHelpView: false,
+            category: ts.Diagnostics.Command_line_Options,
+            description: ts.Diagnostics.Whether_to_keep_outdated_console_output_in_watch_mode_instead_of_clearing_the_screen,
+        },
+        {
+            name: "watch",
+            shortName: "w",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Command_line_Options,
+            description: ts.Diagnostics.Watch_input_files,
+        },
+        // Basic
+        {
+            name: "target",
+            shortName: "t",
+            type: ts.createMapFromTemplate({
+                es3: 0 /* ES3 */,
+                es5: 1 /* ES5 */,
+                es6: 2 /* ES2015 */,
+                es2015: 2 /* ES2015 */,
+                es2016: 3 /* ES2016 */,
+                es2017: 4 /* ES2017 */,
+                es2018: 5 /* ES2018 */,
+                esnext: 6 /* ESNext */,
+            }),
+            paramType: ts.Diagnostics.VERSION,
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Specify_ECMAScript_target_version_Colon_ES3_default_ES5_ES2015_ES2016_ES2017_ES2018_or_ESNEXT,
+        },
+        {
+            name: "module",
+            shortName: "m",
+            type: ts.createMapFromTemplate({
+                none: ts.ModuleKind.None,
+                commonjs: ts.ModuleKind.CommonJS,
+                amd: ts.ModuleKind.AMD,
+                system: ts.ModuleKind.System,
+                umd: ts.ModuleKind.UMD,
+                es6: ts.ModuleKind.ES2015,
+                es2015: ts.ModuleKind.ES2015,
+                esnext: ts.ModuleKind.ESNext
+            }),
+            paramType: ts.Diagnostics.KIND,
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Specify_module_code_generation_Colon_none_commonjs_amd_system_umd_es2015_or_ESNext,
+        },
+        {
+            name: "lib",
+            type: "list",
+            element: {
+                name: "lib",
+                type: ts.libMap
+            },
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Specify_library_files_to_be_included_in_the_compilation
+        },
+        {
+            name: "allowJs",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Allow_javascript_files_to_be_compiled
+        },
+        {
+            name: "checkJs",
+            type: "boolean",
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Report_errors_in_js_files
+        },
+        {
+            name: "jsx",
+            type: ts.createMapFromTemplate({
+                "preserve": 1 /* Preserve */,
+                "react-native": 3 /* ReactNative */,
+                "react": 2 /* React */
+            }),
+            paramType: ts.Diagnostics.KIND,
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Specify_JSX_code_generation_Colon_preserve_react_native_or_react,
+        },
+        {
+            name: "declaration",
+            shortName: "d",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Generates_corresponding_d_ts_file,
+        },
+        {
+            name: "declarationMap",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Generates_a_sourcemap_for_each_corresponding_d_ts_file,
+        },
+        {
+            name: "emitDeclarationOnly",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Only_emit_d_ts_declaration_files,
+        },
+        {
+            name: "sourceMap",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Generates_corresponding_map_file,
+        },
+        {
+            name: "outFile",
+            type: "string",
+            isFilePath: true,
+            paramType: ts.Diagnostics.FILE,
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Concatenate_and_emit_output_to_single_file,
+        },
+        {
+            name: "outDir",
+            type: "string",
+            isFilePath: true,
+            paramType: ts.Diagnostics.DIRECTORY,
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Redirect_output_structure_to_the_directory,
+        },
+        {
+            name: "rootDir",
+            type: "string",
+            isFilePath: true,
+            paramType: ts.Diagnostics.LOCATION,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Specify_the_root_directory_of_input_files_Use_to_control_the_output_directory_structure_with_outDir,
+        },
+        {
+            name: "composite",
+            type: "boolean",
+            isTSConfigOnly: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Enable_project_compilation,
+        },
+        {
+            name: "removeComments",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Do_not_emit_comments_to_output,
+        },
+        {
+            name: "noEmit",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Do_not_emit_outputs,
+        },
+        {
+            name: "importHelpers",
+            type: "boolean",
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Import_emit_helpers_from_tslib
+        },
+        {
+            name: "downlevelIteration",
+            type: "boolean",
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Provide_full_support_for_iterables_in_for_of_spread_and_destructuring_when_targeting_ES5_or_ES3
+        },
+        {
+            name: "isolatedModules",
+            type: "boolean",
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Transpile_each_file_as_a_separate_module_similar_to_ts_transpileModule
+        },
+        // Strict Type Checks
+        {
+            name: "strict",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Strict_Type_Checking_Options,
+            description: ts.Diagnostics.Enable_all_strict_type_checking_options
+        },
+        {
+            name: "noImplicitAny",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Strict_Type_Checking_Options,
+            description: ts.Diagnostics.Raise_error_on_expressions_and_declarations_with_an_implied_any_type,
+        },
+        {
+            name: "strictNullChecks",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Strict_Type_Checking_Options,
+            description: ts.Diagnostics.Enable_strict_null_checks
+        },
+        {
+            name: "strictFunctionTypes",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Strict_Type_Checking_Options,
+            description: ts.Diagnostics.Enable_strict_checking_of_function_types
+        },
+        {
+            name: "strictPropertyInitialization",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Strict_Type_Checking_Options,
+            description: ts.Diagnostics.Enable_strict_checking_of_property_initialization_in_classes
+        },
+        {
+            name: "noImplicitThis",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Strict_Type_Checking_Options,
+            description: ts.Diagnostics.Raise_error_on_this_expressions_with_an_implied_any_type,
+        },
+        {
+            name: "alwaysStrict",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Strict_Type_Checking_Options,
+            description: ts.Diagnostics.Parse_in_strict_mode_and_emit_use_strict_for_each_source_file
+        },
+        // Additional Checks
+        {
+            name: "noUnusedLocals",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Additional_Checks,
+            description: ts.Diagnostics.Report_errors_on_unused_locals,
+        },
+        {
+            name: "noUnusedParameters",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Additional_Checks,
+            description: ts.Diagnostics.Report_errors_on_unused_parameters,
+        },
+        {
+            name: "noImplicitReturns",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Additional_Checks,
+            description: ts.Diagnostics.Report_error_when_not_all_code_paths_in_function_return_a_value
+        },
+        {
+            name: "noFallthroughCasesInSwitch",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Additional_Checks,
+            description: ts.Diagnostics.Report_errors_for_fallthrough_cases_in_switch_statement
+        },
+        // Module Resolution
+        {
+            name: "moduleResolution",
+            type: ts.createMapFromTemplate({
+                node: ts.ModuleResolutionKind.NodeJs,
+                classic: ts.ModuleResolutionKind.Classic,
+            }),
+            paramType: ts.Diagnostics.STRATEGY,
+            category: ts.Diagnostics.Module_Resolution_Options,
+            description: ts.Diagnostics.Specify_module_resolution_strategy_Colon_node_Node_js_or_classic_TypeScript_pre_1_6,
+        },
+        {
+            name: "baseUrl",
+            type: "string",
+            isFilePath: true,
+            category: ts.Diagnostics.Module_Resolution_Options,
+            description: ts.Diagnostics.Base_directory_to_resolve_non_absolute_module_names
+        },
+        {
+            // this option can only be specified in tsconfig.json
+            // use type = object to copy the value as-is
+            name: "paths",
+            type: "object",
+            isTSConfigOnly: true,
+            category: ts.Diagnostics.Module_Resolution_Options,
+            description: ts.Diagnostics.A_series_of_entries_which_re_map_imports_to_lookup_locations_relative_to_the_baseUrl
+        },
+        {
+            // this option can only be specified in tsconfig.json
+            // use type = object to copy the value as-is
+            name: "rootDirs",
+            type: "list",
+            isTSConfigOnly: true,
+            element: {
+                name: "rootDirs",
+                type: "string",
+                isFilePath: true
+            },
+            category: ts.Diagnostics.Module_Resolution_Options,
+            description: ts.Diagnostics.List_of_root_folders_whose_combined_content_represents_the_structure_of_the_project_at_runtime
+        },
+        {
+            name: "typeRoots",
+            type: "list",
+            element: {
+                name: "typeRoots",
+                type: "string",
+                isFilePath: true
+            },
+            category: ts.Diagnostics.Module_Resolution_Options,
+            description: ts.Diagnostics.List_of_folders_to_include_type_definitions_from
+        },
+        {
+            name: "types",
+            type: "list",
+            element: {
+                name: "types",
+                type: "string"
+            },
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Module_Resolution_Options,
+            description: ts.Diagnostics.Type_declaration_files_to_be_included_in_compilation
+        },
+        {
+            name: "allowSyntheticDefaultImports",
+            type: "boolean",
+            category: ts.Diagnostics.Module_Resolution_Options,
+            description: ts.Diagnostics.Allow_default_imports_from_modules_with_no_default_export_This_does_not_affect_code_emit_just_typechecking
+        },
+        {
+            name: "esModuleInterop",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Module_Resolution_Options,
+            description: ts.Diagnostics.Enables_emit_interoperability_between_CommonJS_and_ES_Modules_via_creation_of_namespace_objects_for_all_imports_Implies_allowSyntheticDefaultImports
+        },
+        {
+            name: "preserveSymlinks",
+            type: "boolean",
+            category: ts.Diagnostics.Module_Resolution_Options,
+            description: ts.Diagnostics.Do_not_resolve_the_real_path_of_symlinks,
+        },
+        // Source Maps
+        {
+            name: "sourceRoot",
+            type: "string",
+            isFilePath: true,
+            paramType: ts.Diagnostics.LOCATION,
+            category: ts.Diagnostics.Source_Map_Options,
+            description: ts.Diagnostics.Specify_the_location_where_debugger_should_locate_TypeScript_files_instead_of_source_locations,
+        },
+        {
+            name: "mapRoot",
+            type: "string",
+            isFilePath: true,
+            paramType: ts.Diagnostics.LOCATION,
+            category: ts.Diagnostics.Source_Map_Options,
+            description: ts.Diagnostics.Specify_the_location_where_debugger_should_locate_map_files_instead_of_generated_locations,
+        },
+        {
+            name: "inlineSourceMap",
+            type: "boolean",
+            category: ts.Diagnostics.Source_Map_Options,
+            description: ts.Diagnostics.Emit_a_single_file_with_source_maps_instead_of_having_a_separate_file
+        },
+        {
+            name: "inlineSources",
+            type: "boolean",
+            category: ts.Diagnostics.Source_Map_Options,
+            description: ts.Diagnostics.Emit_the_source_alongside_the_sourcemaps_within_a_single_file_requires_inlineSourceMap_or_sourceMap_to_be_set
+        },
+        // Experimental
+        {
+            name: "experimentalDecorators",
+            type: "boolean",
+            category: ts.Diagnostics.Experimental_Options,
+            description: ts.Diagnostics.Enables_experimental_support_for_ES7_decorators
+        },
+        {
+            name: "emitDecoratorMetadata",
+            type: "boolean",
+            category: ts.Diagnostics.Experimental_Options,
+            description: ts.Diagnostics.Enables_experimental_support_for_emitting_type_metadata_for_decorators
+        },
+        // Advanced
+        {
+            name: "jsxFactory",
+            type: "string",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Specify_the_JSX_factory_function_to_use_when_targeting_react_JSX_emit_e_g_React_createElement_or_h
+        },
+        {
+            name: "diagnostics",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Show_diagnostic_information
+        },
+        {
+            name: "extendedDiagnostics",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Show_verbose_diagnostic_information
+        },
+        {
+            name: "traceResolution",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Enable_tracing_of_the_name_resolution_process
+        },
+        {
+            name: "resolveJsonModule",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Include_modules_imported_with_json_extension
+        },
+        {
+            name: "listFiles",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Print_names_of_files_part_of_the_compilation
+        },
+        {
+            name: "listEmittedFiles",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Print_names_of_generated_files_part_of_the_compilation
+        },
+        {
+            name: "out",
+            type: "string",
+            isFilePath: false,
+            // for correct behaviour, please use outFile
+            category: ts.Diagnostics.Advanced_Options,
+            paramType: ts.Diagnostics.FILE,
+            description: ts.Diagnostics.Deprecated_Use_outFile_instead_Concatenate_and_emit_output_to_single_file,
+        },
+        {
+            name: "reactNamespace",
+            type: "string",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Deprecated_Use_jsxFactory_instead_Specify_the_object_invoked_for_createElement_when_targeting_react_JSX_emit
+        },
+        {
+            name: "skipDefaultLibCheck",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Deprecated_Use_skipLibCheck_instead_Skip_type_checking_of_default_library_declaration_files
+        },
+        {
+            name: "charset",
+            type: "string",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.The_character_set_of_the_input_files
+        },
+        {
+            name: "emitBOM",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Emit_a_UTF_8_Byte_Order_Mark_BOM_in_the_beginning_of_output_files
+        },
+        {
+            name: "locale",
+            type: "string",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.The_locale_used_when_displaying_messages_to_the_user_e_g_en_us
+        },
+        {
+            name: "newLine",
+            type: ts.createMapFromTemplate({
+                crlf: 0 /* CarriageReturnLineFeed */,
+                lf: 1 /* LineFeed */
+            }),
+            paramType: ts.Diagnostics.NEWLINE,
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Specify_the_end_of_line_sequence_to_be_used_when_emitting_files_Colon_CRLF_dos_or_LF_unix,
+        },
+        {
+            name: "noErrorTruncation",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Do_not_truncate_error_messages
+        },
+        {
+            name: "noLib",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Do_not_include_the_default_library_file_lib_d_ts
+        },
+        {
+            name: "noResolve",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Do_not_add_triple_slash_references_or_imported_modules_to_the_list_of_compiled_files
+        },
+        {
+            name: "stripInternal",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Do_not_emit_declarations_for_code_that_has_an_internal_annotation,
+        },
+        {
+            name: "disableSizeLimit",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Disable_size_limitations_on_JavaScript_projects
+        },
+        {
+            name: "noImplicitUseStrict",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Do_not_emit_use_strict_directives_in_module_output
+        },
+        {
+            name: "noEmitHelpers",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Do_not_generate_custom_helper_functions_like_extends_in_compiled_output
+        },
+        {
+            name: "noEmitOnError",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Do_not_emit_outputs_if_any_errors_were_reported,
+        },
+        {
+            name: "preserveConstEnums",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Do_not_erase_const_enum_declarations_in_generated_code
+        },
+        {
+            name: "declarationDir",
+            type: "string",
+            isFilePath: true,
+            paramType: ts.Diagnostics.DIRECTORY,
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Output_directory_for_generated_declaration_files
+        },
+        {
+            name: "skipLibCheck",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Skip_type_checking_of_declaration_files,
+        },
+        {
+            name: "allowUnusedLabels",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Do_not_report_errors_on_unused_labels
+        },
+        {
+            name: "allowUnreachableCode",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Do_not_report_errors_on_unreachable_code
+        },
+        {
+            name: "suppressExcessPropertyErrors",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Suppress_excess_property_checks_for_object_literals,
+        },
+        {
+            name: "suppressImplicitAnyIndexErrors",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Suppress_noImplicitAny_errors_for_indexing_objects_lacking_index_signatures,
+        },
+        {
+            name: "forceConsistentCasingInFileNames",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Disallow_inconsistently_cased_references_to_the_same_file
+        },
+        {
+            name: "maxNodeModuleJsDepth",
+            type: "number",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.The_maximum_dependency_depth_to_search_under_node_modules_and_load_JavaScript_files
+        },
+        {
+            name: "noStrictGenericChecks",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Disable_strict_checking_of_generic_signatures_in_function_types,
+        },
+        {
+            name: "keyofStringsOnly",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Resolve_keyof_to_string_valued_property_names_only_no_numbers_or_symbols,
+        },
+        {
+            // A list of plugins to load in the language service
+            name: "plugins",
+            type: "list",
+            isTSConfigOnly: true,
+            element: {
+                name: "plugin",
+                type: "object"
+            },
+            description: ts.Diagnostics.List_of_language_service_plugins
         }
-        return 1;
-    }
-    var ContainerFlags;
-    (function (ContainerFlags) {
-        ContainerFlags[ContainerFlags["None"] = 0] = "None";
-        ContainerFlags[ContainerFlags["IsContainer"] = 1] = "IsContainer";
-        ContainerFlags[ContainerFlags["IsBlockScopedContainer"] = 2] = "IsBlockScopedContainer";
-        ContainerFlags[ContainerFlags["IsControlFlowContainer"] = 4] = "IsControlFlowContainer";
-        ContainerFlags[ContainerFlags["IsFunctionLike"] = 8] = "IsFunctionLike";
-        ContainerFlags[ContainerFlags["IsFunctionExpression"] = 16] = "IsFunctionExpression";
-        ContainerFlags[ContainerFlags["HasLocals"] = 32] = "HasLocals";
-        ContainerFlags[ContainerFlags["IsInterface"] = 64] = "IsInterface";
-        ContainerFlags[ContainerFlags["IsObjectLiteralOrClassExpressionMethod"] = 128] = "IsObjectLiteralOrClassExpressionMethod";
-    })(ContainerFlags || (ContainerFlags = {}));
-    var binder = createBinder();
-    function bindSourceFile(file, options) {
-        ts.performance.mark("beforeBind");
-        binder(file, options);
-        ts.performance.mark("afterBind");
-        ts.performance.measure("Bind", "beforeBind", "afterBind");
-    }
-    ts.bindSourceFile = bindSourceFile;
-    function createBinder() {
-        var file;
-        var options;
-        var languageVersion;
-        var parent;
-        var container;
-        var thisParentContainer;
-        var blockScopeContainer;
-        var lastContainer;
-        var delayedTypeAliases;
-        var seenThisKeyword;
-        var currentFlow;
-        var currentBreakTarget;
-        var currentContinueTarget;
-        var currentReturnTarget;
-        var currentTrueTarget;
-        var currentFalseTarget;
-        var preSwitchCaseFlow;
-        var activeLabels;
-        var hasExplicitReturn;
-        var emitFlags;
-        var inStrictMode;
-        var symbolCount = 0;
-        var Symbol;
-        var classifiableNames;
-        var unreachableFlow = { flags: 1 };
-        var reportedUnreachableFlow = { flags: 1 };
-        var subtreeTransformFlags = 0;
-        var skipTransformFlagAggregation;
-        function createDiagnosticForNode(node, message, arg0, arg1, arg2) {
-            return ts.createDiagnosticForNodeInSourceFile(ts.getSourceFileOfNode(node) || file, node, message, arg0, arg1, arg2);
-        }
-        function bindSourceFile(f, opts) {
-            file = f;
-            options = opts;
-            languageVersion = ts.getEmitScriptTarget(options);
-            inStrictMode = bindInStrictMode(file, opts);
-            classifiableNames = ts.createUnderscoreEscapedMap();
-            symbolCount = 0;
-            skipTransformFlagAggregation = file.isDeclarationFile;
-            Symbol = ts.objectAllocator.getSymbolConstructor();
-            if (!file.locals) {
-                bind(file);
-                file.symbolCount = symbolCount;
-                file.classifiableNames = classifiableNames;
-                delayedBindJSDocTypedefTag();
+    ];
+    /* @internal */
+    ts.typeAcquisitionDeclarations = [
+        {
+            /* @deprecated typingOptions.enableAutoDiscovery
+             * Use typeAcquisition.enable instead.
+             */
+            name: "enableAutoDiscovery",
+            type: "boolean",
+        },
+        {
+            name: "enable",
+            type: "boolean",
+        },
+        {
+            name: "include",
+            type: "list",
+            element: {
+                name: "include",
+                type: "string"
             }
-            file = undefined;
-            options = undefined;
-            languageVersion = undefined;
-            parent = undefined;
-            container = undefined;
-            thisParentContainer = undefined;
-            blockScopeContainer = undefined;
-            lastContainer = undefined;
-            delayedTypeAliases = undefined;
-            seenThisKeyword = false;
-            currentFlow = undefined;
-            currentBreakTarget = undefined;
-            currentContinueTarget = undefined;
-            currentReturnTarget = undefined;
-            currentTrueTarget = undefined;
-            currentFalseTarget = undefined;
-            activeLabels = undefined;
-            hasExplicitReturn = false;
-            emitFlags = 0;
-            subtreeTransformFlags = 0;
-        }
-        return bindSourceFile;
-        function bindInStrictMode(file, opts) {
-            if (ts.getStrictOptionValue(opts, "alwaysStrict") && !file.isDeclarationFile) {
-                return true;
-            }
-            else {
-                return !!file.externalModuleIndicator;
+        },
+        {
+            name: "exclude",
+            type: "list",
+            element: {
+                name: "exclude",
+                type: "string"
             }
         }
-        function createSymbol(flags, name) {
-            symbolCount++;
-            return new Symbol(flags, name);
-        }
-        function addDeclarationToSymbol(symbol, node, symbolFlags) {
-            symbol.flags |= symbolFlags;
-            node.symbol = symbol;
-            symbol.declarations = ts.append(symbol.declarations, node);
-            if (symbolFlags & 1952 && !symbol.exports) {
-                symbol.exports = ts.createSymbolTable();
-            }
-            if (symbolFlags & 6240 && !symbol.members) {
-                symbol.members = ts.createSymbolTable();
-            }
-            if (symbolFlags & 67216319) {
-                var valueDeclaration = symbol.valueDeclaration;
-                if (!valueDeclaration ||
-                    (valueDeclaration.kind !== node.kind && valueDeclaration.kind === 239)) {
-                    symbol.valueDeclaration = node;
-                }
-            }
-        }
-        function getDeclarationName(node) {
-            if (node.kind === 249) {
-                return node.isExportEquals ? "export=" : "default";
-            }
-            var name = ts.getNameOfDeclaration(node);
-            if (name) {
-                if (ts.isAmbientModule(node)) {
-                    var moduleName = ts.getTextOfIdentifierOrLiteral(name);
-                    return (ts.isGlobalScopeAugmentation(node) ? "__global" : "\"" + moduleName + "\"");
-                }
-                if (name.kind === 147) {
-                    var nameExpression = name.expression;
-                    if (ts.isStringOrNumericLiteral(nameExpression)) {
-                        return ts.escapeLeadingUnderscores(nameExpression.text);
-                    }
-                    ts.Debug.assert(ts.isWellKnownSymbolSyntactically(nameExpression));
-                    return ts.getPropertyNameForKnownSymbolName(ts.idText(nameExpression.name));
-                }
-                return ts.isPropertyNameLiteral(name) ? ts.getEscapedTextOfIdentifierOrLiteral(name) : undefined;
-            }
-            switch (node.kind) {
-                case 155:
-                    return "__constructor";
-                case 163:
-                case 158:
-                case 288:
-                    return "__call";
-                case 164:
-                case 159:
-                    return "__new";
-                case 160:
-                    return "__index";
-                case 250:
-                    return "__export";
-                case 274:
-                    return "export=";
-                case 200:
-                    if (ts.getSpecialPropertyAssignmentKind(node) === 2) {
-                        return "export=";
-                    }
-                    ts.Debug.fail("Unknown binary declaration kind");
-                    break;
-                case 284:
-                    return (ts.isJSDocConstructSignature(node) ? "__new" : "__call");
-                case 149:
-                    ts.Debug.assert(node.parent.kind === 284, "Impossible parameter parent kind", function () { return "parent is: " + (ts.SyntaxKind ? ts.SyntaxKind[node.parent.kind] : node.parent.kind) + ", expected JSDocFunctionType"; });
-                    var functionType = node.parent;
-                    var index = functionType.parameters.indexOf(node);
-                    return "arg" + index;
-            }
-        }
-        function getDisplayName(node) {
-            return ts.isNamedDeclaration(node) ? ts.declarationNameToString(node.name) : ts.unescapeLeadingUnderscores(getDeclarationName(node));
-        }
-        function declareSymbol(symbolTable, parent, node, includes, excludes, isReplaceableByMethod) {
-            ts.Debug.assert(!ts.hasDynamicName(node));
-            var isDefaultExport = ts.hasModifier(node, 512);
-            var name = isDefaultExport && parent ? "default" : getDeclarationName(node);
-            var symbol;
-            if (name === undefined) {
-                symbol = createSymbol(0, "__missing");
-            }
-            else {
-                symbol = symbolTable.get(name);
-                if (includes & 2885600) {
-                    classifiableNames.set(name, true);
-                }
-                if (!symbol) {
-                    symbolTable.set(name, symbol = createSymbol(0, name));
-                    if (isReplaceableByMethod)
-                        symbol.isReplaceableByMethod = true;
-                }
-                else if (isReplaceableByMethod && !symbol.isReplaceableByMethod) {
-                    return symbol;
-                }
-                else if (symbol.flags & excludes) {
-                    if (symbol.isReplaceableByMethod) {
-                        symbolTable.set(name, symbol = createSymbol(0, name));
-                    }
-                    else {
-                        if (ts.isNamedDeclaration(node)) {
-                            node.name.parent = node;
-                        }
-                        var message_1 = symbol.flags & 2
-                            ? ts.Diagnostics.Cannot_redeclare_block_scoped_variable_0
-                            : ts.Diagnostics.Duplicate_identifier_0;
-                        if (symbol.flags & 384 || includes & 384) {
-                            message_1 = ts.Diagnostics.Enum_declarations_can_only_merge_with_namespace_or_other_enum_declarations;
-                        }
-                        if (symbol.declarations && symbol.declarations.length) {
-                            if (isDefaultExport) {
-                                message_1 = ts.Diagnostics.A_module_cannot_have_multiple_default_exports;
-                            }
-                            else {
-                                if (symbol.declarations && symbol.declarations.length &&
-                                    (node.kind === 249 && !node.isExportEquals)) {
-                                    message_1 = ts.Diagnostics.A_module_cannot_have_multiple_default_exports;
-                                }
-                            }
-                        }
-                        ts.forEach(symbol.declarations, function (declaration) {
-                            file.bindDiagnostics.push(createDiagnosticForNode(ts.getNameOfDeclaration(declaration) || declaration, message_1, getDisplayName(declaration)));
-                        });
-                        file.bindDiagnostics.push(createDiagnosticForNode(ts.getNameOfDeclaration(node) || node, message_1, getDisplayName(node)));
-                        symbol = createSymbol(0, name);
-                    }
-                }
-            }
-            addDeclarationToSymbol(symbol, node, includes);
-            if (symbol.parent) {
-                ts.Debug.assert(symbol.parent === parent, "Existing symbol parent should match new one");
-            }
-            else {
-                symbol.parent = parent;
-            }
-            return symbol;
-        }
-        function declareModuleMember(node, symbolFlags, symbolExcludes) {
-            var hasExportModifier = ts.getCombinedModifierFlags(node) & 1;
-            if (symbolFlags & 2097152) {
-                if (node.kind === 252 || (node.kind === 243 && hasExportModifier)) {
-                    return declareSymbol(container.symbol.exports, container.symbol, node, symbolFlags, symbolExcludes);
-                }
-                else {
-                    return declareSymbol(container.locals, undefined, node, symbolFlags, symbolExcludes);
-                }
-            }
-            else {
-                if (ts.isJSDocTypeAlias(node))
-                    ts.Debug.assert(ts.isInJavaScriptFile(node));
-                if ((!ts.isAmbientModule(node) && (hasExportModifier || container.flags & 32)) || ts.isJSDocTypeAlias(node)) {
-                    if (ts.hasModifier(node, 512) && !getDeclarationName(node)) {
-                        return declareSymbol(container.symbol.exports, container.symbol, node, symbolFlags, symbolExcludes);
-                    }
-                    var exportKind = symbolFlags & 67216319 ? 1048576 : 0;
-                    var local = declareSymbol(container.locals, undefined, node, exportKind, symbolExcludes);
-                    local.exportSymbol = declareSymbol(container.symbol.exports, container.symbol, node, symbolFlags, symbolExcludes);
-                    node.localSymbol = local;
-                    return local;
-                }
-                else {
-                    return declareSymbol(container.locals, undefined, node, symbolFlags, symbolExcludes);
-                }
-            }
-        }
-        function bindContainer(node, containerFlags) {
-            var saveContainer = container;
-            var saveThisParentContainer = thisParentContainer;
-            var savedBlockScopeContainer = blockScopeContainer;
-            if (containerFlags & 1) {
-                if (node.kind !== 193) {
-                    thisParentContainer = container;
-                }
-                container = blockScopeContainer = node;
-                if (containerFlags & 32) {
-                    container.locals = ts.createSymbolTable();
-                }
-                addToContainerChain(container);
-            }
-            else if (containerFlags & 2) {
-                blockScopeContainer = node;
-                blockScopeContainer.locals = undefined;
-            }
-            if (containerFlags & 4) {
-                var saveCurrentFlow = currentFlow;
-                var saveBreakTarget = currentBreakTarget;
-                var saveContinueTarget = currentContinueTarget;
-                var saveReturnTarget = currentReturnTarget;
-                var saveActiveLabels = activeLabels;
-                var saveHasExplicitReturn = hasExplicitReturn;
-                var isIIFE = containerFlags & 16 && !ts.hasModifier(node, 256) &&
-                    !node.asteriskToken && !!ts.getImmediatelyInvokedFunctionExpression(node);
-                if (!isIIFE) {
-                    currentFlow = { flags: 2 };
-                    if (containerFlags & (16 | 128)) {
-                        currentFlow.container = node;
-                    }
-                }
-                currentReturnTarget = isIIFE || node.kind === 155 ? createBranchLabel() : undefined;
-                currentBreakTarget = undefined;
-                currentContinueTarget = undefined;
-                activeLabels = undefined;
-                hasExplicitReturn = false;
-                bindChildren(node);
-                node.flags &= ~1408;
-                if (!(currentFlow.flags & 1) && containerFlags & 8 && ts.nodeIsPresent(node.body)) {
-                    node.flags |= 128;
-                    if (hasExplicitReturn)
-                        node.flags |= 256;
-                }
-                if (node.kind === 274) {
-                    node.flags |= emitFlags;
-                }
-                if (currentReturnTarget) {
-                    addAntecedent(currentReturnTarget, currentFlow);
-                    currentFlow = finishFlowLabel(currentReturnTarget);
-                    if (node.kind === 155) {
-                        node.returnFlowNode = currentFlow;
-                    }
-                }
-                if (!isIIFE) {
-                    currentFlow = saveCurrentFlow;
-                }
-                currentBreakTarget = saveBreakTarget;
-                currentContinueTarget = saveContinueTarget;
-                currentReturnTarget = saveReturnTarget;
-                activeLabels = saveActiveLabels;
-                hasExplicitReturn = saveHasExplicitReturn;
-            }
-            else if (containerFlags & 64) {
-                seenThisKeyword = false;
-                bindChildren(node);
-                node.flags = seenThisKeyword ? node.flags | 64 : node.flags & ~64;
-            }
-            else {
-                bindChildren(node);
-            }
-            container = saveContainer;
-            thisParentContainer = saveThisParentContainer;
-            blockScopeContainer = savedBlockScopeContainer;
-        }
-        function bindChildren(node) {
-            if (skipTransformFlagAggregation) {
-                bindChildrenWorker(node);
-            }
-            else if (node.transformFlags & 536870912) {
-                skipTransformFlagAggregation = true;
-                bindChildrenWorker(node);
-                skipTransformFlagAggregation = false;
-                subtreeTransformFlags |= node.transformFlags & ~getTransformFlagsSubtreeExclusions(node.kind);
-            }
-            else {
-                var savedSubtreeTransformFlags = subtreeTransformFlags;
-                subtreeTransformFlags = 0;
-                bindChildrenWorker(node);
-                subtreeTransformFlags = savedSubtreeTransformFlags | computeTransformFlagsForNode(node, subtreeTransformFlags);
-            }
-        }
-        function bindEachFunctionsFirst(nodes) {
-            bindEach(nodes, function (n) { return n.kind === 234 ? bind(n) : undefined; });
-            bindEach(nodes, function (n) { return n.kind !== 234 ? bind(n) : undefined; });
-        }
-        function bindEach(nodes, bindFunction) {
-            if (bindFunction === void 0) { bindFunction = bind; }
-            if (nodes === undefined) {
-                return;
-            }
-            if (skipTransformFlagAggregation) {
-                ts.forEach(nodes, bindFunction);
-            }
-            else {
-                var savedSubtreeTransformFlags = subtreeTransformFlags;
-                subtreeTransformFlags = 0;
-                var nodeArrayFlags = 0;
-                for (var _i = 0, nodes_2 = nodes; _i < nodes_2.length; _i++) {
-                    var node = nodes_2[_i];
-                    bindFunction(node);
-                    nodeArrayFlags |= node.transformFlags & ~536870912;
-                }
-                nodes.transformFlags = nodeArrayFlags | 536870912;
-                subtreeTransformFlags |= savedSubtreeTransformFlags;
-            }
-        }
-        function bindEachChild(node) {
-            ts.forEachChild(node, bind, bindEach);
-        }
-        function bindChildrenWorker(node) {
-            if (checkUnreachable(node)) {
-                bindEachChild(node);
-                return;
-            }
-            switch (node.kind) {
-                case 219:
-                    bindWhileStatement(node);
-                    break;
-                case 218:
-                    bindDoStatement(node);
-                    break;
-                case 220:
-                    bindForStatement(node);
-                    break;
-                case 221:
-                case 222:
-                    bindForInOrForOfStatement(node);
-                    break;
-                case 217:
-                    bindIfStatement(node);
-                    break;
-                case 225:
-                case 229:
-                    bindReturnOrThrow(node);
-                    break;
-                case 224:
-                case 223:
-                    bindBreakOrContinueStatement(node);
-                    break;
-                case 230:
-                    bindTryStatement(node);
-                    break;
-                case 227:
-                    bindSwitchStatement(node);
-                    break;
-                case 241:
-                    bindCaseBlock(node);
-                    break;
-                case 266:
-                    bindCaseClause(node);
-                    break;
-                case 228:
-                    bindLabeledStatement(node);
-                    break;
-                case 198:
-                    bindPrefixUnaryExpressionFlow(node);
-                    break;
-                case 199:
-                    bindPostfixUnaryExpressionFlow(node);
-                    break;
-                case 200:
-                    bindBinaryExpressionFlow(node);
-                    break;
-                case 194:
-                    bindDeleteExpressionFlow(node);
-                    break;
-                case 201:
-                    bindConditionalExpressionFlow(node);
-                    break;
-                case 232:
-                    bindVariableDeclarationFlow(node);
-                    break;
-                case 187:
-                    bindCallExpressionFlow(node);
-                    break;
-                case 297:
-                case 292:
-                    bindJSDocTypeAlias(node);
-                    break;
-                case 274:
-                    bindEachFunctionsFirst(node.statements);
-                    bind(node.endOfFileToken);
-                    break;
-                case 213:
-                case 240:
-                    bindEachFunctionsFirst(node.statements);
-                    break;
-                default:
-                    bindEachChild(node);
-                    break;
-            }
-            bindJSDoc(node);
-        }
-        function isNarrowingExpression(expr) {
-            switch (expr.kind) {
-                case 71:
-                case 99:
-                case 185:
-                    return isNarrowableReference(expr);
-                case 187:
-                    return hasNarrowableArgument(expr);
-                case 191:
-                    return isNarrowingExpression(expr.expression);
-                case 200:
-                    return isNarrowingBinaryExpression(expr);
-                case 198:
-                    return expr.operator === 51 && isNarrowingExpression(expr.operand);
-            }
-            return false;
-        }
-        function isNarrowableReference(expr) {
-            return expr.kind === 71 ||
-                expr.kind === 99 ||
-                expr.kind === 97 ||
-                expr.kind === 185 && isNarrowableReference(expr.expression);
-        }
-        function hasNarrowableArgument(expr) {
-            if (expr.arguments) {
-                for (var _i = 0, _a = expr.arguments; _i < _a.length; _i++) {
-                    var argument = _a[_i];
-                    if (isNarrowableReference(argument)) {
-                        return true;
-                    }
-                }
-            }
-            if (expr.expression.kind === 185 &&
-                isNarrowableReference(expr.expression.expression)) {
-                return true;
-            }
-            return false;
-        }
-        function isNarrowingTypeofOperands(expr1, expr2) {
-            return ts.isTypeOfExpression(expr1) && isNarrowableOperand(expr1.expression) && ts.isStringLiteralLike(expr2);
-        }
-        function isNarrowableInOperands(left, right) {
-            return ts.isStringLiteralLike(left) && isNarrowingExpression(right);
-        }
-        function isNarrowingBinaryExpression(expr) {
-            switch (expr.operatorToken.kind) {
-                case 58:
-                    return isNarrowableReference(expr.left);
-                case 32:
-                case 33:
-                case 34:
-                case 35:
-                    return isNarrowableOperand(expr.left) || isNarrowableOperand(expr.right) ||
-                        isNarrowingTypeofOperands(expr.right, expr.left) || isNarrowingTypeofOperands(expr.left, expr.right);
-                case 93:
-                    return isNarrowableOperand(expr.left);
-                case 92:
-                    return isNarrowableInOperands(expr.left, expr.right);
-                case 26:
-                    return isNarrowingExpression(expr.right);
-            }
-            return false;
-        }
-        function isNarrowableOperand(expr) {
-            switch (expr.kind) {
-                case 191:
-                    return isNarrowableOperand(expr.expression);
-                case 200:
-                    switch (expr.operatorToken.kind) {
-                        case 58:
-                            return isNarrowableOperand(expr.left);
-                        case 26:
-                            return isNarrowableOperand(expr.right);
-                    }
-            }
-            return isNarrowableReference(expr);
-        }
-        function createBranchLabel() {
+    ];
+    /* @internal */
+    ts.defaultInitCompilerOptions = {
+        module: ts.ModuleKind.CommonJS,
+        target: 1 /* ES5 */,
+        strict: true,
+        esModuleInterop: true
+    };
+    var optionNameMapCache;
+    /* @internal */
+    function convertEnableAutoDiscoveryToEnable(typeAcquisition) {
+        // Convert deprecated typingOptions.enableAutoDiscovery to typeAcquisition.enable
+        if (typeAcquisition && typeAcquisition.enableAutoDiscovery !== undefined && typeAcquisition.enable === undefined) {
             return {
-                flags: 4,
-                antecedents: undefined
+                enable: typeAcquisition.enableAutoDiscovery,
+                include: typeAcquisition.include || [],
+                exclude: typeAcquisition.exclude || []
             };
         }
-        function createLoopLabel() {
-            return {
-                flags: 8,
-                antecedents: undefined
-            };
+        return typeAcquisition;
+    }
+    ts.convertEnableAutoDiscoveryToEnable = convertEnableAutoDiscoveryToEnable;
+    function getOptionNameMap() {
+        if (optionNameMapCache) {
+            return optionNameMapCache;
         }
-        function setFlowNodeReferenced(flow) {
-            flow.flags |= flow.flags & 512 ? 1024 : 512;
-        }
-        function addAntecedent(label, antecedent) {
-            if (!(antecedent.flags & 1) && !ts.contains(label.antecedents, antecedent)) {
-                (label.antecedents || (label.antecedents = [])).push(antecedent);
-                setFlowNodeReferenced(antecedent);
-            }
-        }
-        function createFlowCondition(flags, antecedent, expression) {
-            if (antecedent.flags & 1) {
-                return antecedent;
-            }
-            if (!expression) {
-                return flags & 32 ? antecedent : unreachableFlow;
-            }
-            if (expression.kind === 101 && flags & 64 ||
-                expression.kind === 86 && flags & 32) {
-                return unreachableFlow;
-            }
-            if (!isNarrowingExpression(expression)) {
-                return antecedent;
-            }
-            setFlowNodeReferenced(antecedent);
-            return { flags: flags, expression: expression, antecedent: antecedent };
-        }
-        function createFlowSwitchClause(antecedent, switchStatement, clauseStart, clauseEnd) {
-            if (!isNarrowingExpression(switchStatement.expression)) {
-                return antecedent;
-            }
-            setFlowNodeReferenced(antecedent);
-            return { flags: 128, switchStatement: switchStatement, clauseStart: clauseStart, clauseEnd: clauseEnd, antecedent: antecedent };
-        }
-        function createFlowAssignment(antecedent, node) {
-            setFlowNodeReferenced(antecedent);
-            return { flags: 16, antecedent: antecedent, node: node };
-        }
-        function createFlowArrayMutation(antecedent, node) {
-            setFlowNodeReferenced(antecedent);
-            var res = { flags: 256, antecedent: antecedent, node: node };
-            return res;
-        }
-        function finishFlowLabel(flow) {
-            var antecedents = flow.antecedents;
-            if (!antecedents) {
-                return unreachableFlow;
-            }
-            if (antecedents.length === 1) {
-                return antecedents[0];
-            }
-            return flow;
-        }
-        function isStatementCondition(node) {
-            var parent = node.parent;
-            switch (parent.kind) {
-                case 217:
-                case 219:
-                case 218:
-                    return parent.expression === node;
-                case 220:
-                case 201:
-                    return parent.condition === node;
-            }
-            return false;
-        }
-        function isLogicalExpression(node) {
-            while (true) {
-                if (node.kind === 191) {
-                    node = node.expression;
-                }
-                else if (node.kind === 198 && node.operator === 51) {
-                    node = node.operand;
-                }
-                else {
-                    return node.kind === 200 && (node.operatorToken.kind === 53 ||
-                        node.operatorToken.kind === 54);
-                }
-            }
-        }
-        function isTopLevelLogicalExpression(node) {
-            while (node.parent.kind === 191 ||
-                node.parent.kind === 198 &&
-                    node.parent.operator === 51) {
-                node = node.parent;
-            }
-            return !isStatementCondition(node) && !isLogicalExpression(node.parent);
-        }
-        function bindCondition(node, trueTarget, falseTarget) {
-            var saveTrueTarget = currentTrueTarget;
-            var saveFalseTarget = currentFalseTarget;
-            currentTrueTarget = trueTarget;
-            currentFalseTarget = falseTarget;
-            bind(node);
-            currentTrueTarget = saveTrueTarget;
-            currentFalseTarget = saveFalseTarget;
-            if (!node || !isLogicalExpression(node)) {
-                addAntecedent(trueTarget, createFlowCondition(32, currentFlow, node));
-                addAntecedent(falseTarget, createFlowCondition(64, currentFlow, node));
-            }
-        }
-        function bindIterativeStatement(node, breakTarget, continueTarget) {
-            var saveBreakTarget = currentBreakTarget;
-            var saveContinueTarget = currentContinueTarget;
-            currentBreakTarget = breakTarget;
-            currentContinueTarget = continueTarget;
-            bind(node);
-            currentBreakTarget = saveBreakTarget;
-            currentContinueTarget = saveContinueTarget;
-        }
-        function bindWhileStatement(node) {
-            var preWhileLabel = createLoopLabel();
-            var preBodyLabel = createBranchLabel();
-            var postWhileLabel = createBranchLabel();
-            addAntecedent(preWhileLabel, currentFlow);
-            currentFlow = preWhileLabel;
-            bindCondition(node.expression, preBodyLabel, postWhileLabel);
-            currentFlow = finishFlowLabel(preBodyLabel);
-            bindIterativeStatement(node.statement, postWhileLabel, preWhileLabel);
-            addAntecedent(preWhileLabel, currentFlow);
-            currentFlow = finishFlowLabel(postWhileLabel);
-        }
-        function bindDoStatement(node) {
-            var preDoLabel = createLoopLabel();
-            var enclosingLabeledStatement = node.parent.kind === 228
-                ? ts.lastOrUndefined(activeLabels)
-                : undefined;
-            var preConditionLabel = enclosingLabeledStatement ? enclosingLabeledStatement.continueTarget : createBranchLabel();
-            var postDoLabel = enclosingLabeledStatement ? enclosingLabeledStatement.breakTarget : createBranchLabel();
-            addAntecedent(preDoLabel, currentFlow);
-            currentFlow = preDoLabel;
-            bindIterativeStatement(node.statement, postDoLabel, preConditionLabel);
-            addAntecedent(preConditionLabel, currentFlow);
-            currentFlow = finishFlowLabel(preConditionLabel);
-            bindCondition(node.expression, preDoLabel, postDoLabel);
-            currentFlow = finishFlowLabel(postDoLabel);
-        }
-        function bindForStatement(node) {
-            var preLoopLabel = createLoopLabel();
-            var preBodyLabel = createBranchLabel();
-            var postLoopLabel = createBranchLabel();
-            bind(node.initializer);
-            addAntecedent(preLoopLabel, currentFlow);
-            currentFlow = preLoopLabel;
-            bindCondition(node.condition, preBodyLabel, postLoopLabel);
-            currentFlow = finishFlowLabel(preBodyLabel);
-            bindIterativeStatement(node.statement, postLoopLabel, preLoopLabel);
-            bind(node.incrementor);
-            addAntecedent(preLoopLabel, currentFlow);
-            currentFlow = finishFlowLabel(postLoopLabel);
-        }
-        function bindForInOrForOfStatement(node) {
-            var preLoopLabel = createLoopLabel();
-            var postLoopLabel = createBranchLabel();
-            addAntecedent(preLoopLabel, currentFlow);
-            currentFlow = preLoopLabel;
-            if (node.kind === 222) {
-                bind(node.awaitModifier);
-            }
-            bind(node.expression);
-            addAntecedent(postLoopLabel, currentFlow);
-            bind(node.initializer);
-            if (node.initializer.kind !== 233) {
-                bindAssignmentTargetFlow(node.initializer);
-            }
-            bindIterativeStatement(node.statement, postLoopLabel, preLoopLabel);
-            addAntecedent(preLoopLabel, currentFlow);
-            currentFlow = finishFlowLabel(postLoopLabel);
-        }
-        function bindIfStatement(node) {
-            var thenLabel = createBranchLabel();
-            var elseLabel = createBranchLabel();
-            var postIfLabel = createBranchLabel();
-            bindCondition(node.expression, thenLabel, elseLabel);
-            currentFlow = finishFlowLabel(thenLabel);
-            bind(node.thenStatement);
-            addAntecedent(postIfLabel, currentFlow);
-            currentFlow = finishFlowLabel(elseLabel);
-            bind(node.elseStatement);
-            addAntecedent(postIfLabel, currentFlow);
-            currentFlow = finishFlowLabel(postIfLabel);
-        }
-        function bindReturnOrThrow(node) {
-            bind(node.expression);
-            if (node.kind === 225) {
-                hasExplicitReturn = true;
-                if (currentReturnTarget) {
-                    addAntecedent(currentReturnTarget, currentFlow);
-                }
-            }
-            currentFlow = unreachableFlow;
-        }
-        function findActiveLabel(name) {
-            if (activeLabels) {
-                for (var _i = 0, activeLabels_1 = activeLabels; _i < activeLabels_1.length; _i++) {
-                    var label = activeLabels_1[_i];
-                    if (label.name === name) {
-                        return label;
-                    }
-                }
+        var optionNameMap = ts.createMap();
+        var shortOptionNames = ts.createMap();
+        ts.forEach(ts.optionDeclarations, function (option) {
+            optionNameMap.set(option.name.toLowerCase(), option);
+            if (option.shortName) {
+                shortOptionNames.set(option.shortName, option.name);
             }
+        });
+        optionNameMapCache = { optionNameMap: optionNameMap, shortOptionNames: shortOptionNames };
+        return optionNameMapCache;
+    }
+    /* @internal */
+    function createCompilerDiagnosticForInvalidCustomType(opt) {
+        return createDiagnosticForInvalidCustomType(opt, ts.createCompilerDiagnostic);
+    }
+    ts.createCompilerDiagnosticForInvalidCustomType = createCompilerDiagnosticForInvalidCustomType;
+    function createDiagnosticForInvalidCustomType(opt, createDiagnostic) {
+        var namesOfType = ts.arrayFrom(opt.type.keys()).map(function (key) { return "'" + key + "'"; }).join(", ");
+        return createDiagnostic(ts.Diagnostics.Argument_for_0_option_must_be_Colon_1, "--" + opt.name, namesOfType);
+    }
+    /* @internal */
+    function parseCustomTypeOption(opt, value, errors) {
+        return convertJsonOptionOfCustomType(opt, trimString(value || ""), errors);
+    }
+    ts.parseCustomTypeOption = parseCustomTypeOption;
+    /* @internal */
+    function parseListTypeOption(opt, value, errors) {
+        if (value === void 0) { value = ""; }
+        value = trimString(value);
+        if (ts.startsWith(value, "-")) {
             return undefined;
         }
-        function bindBreakOrContinueFlow(node, breakTarget, continueTarget) {
-            var flowLabel = node.kind === 224 ? breakTarget : continueTarget;
-            if (flowLabel) {
-                addAntecedent(flowLabel, currentFlow);
-                currentFlow = unreachableFlow;
-            }
+        if (value === "") {
+            return [];
         }
-        function bindBreakOrContinueStatement(node) {
-            bind(node.label);
-            if (node.label) {
-                var activeLabel = findActiveLabel(node.label.escapedText);
-                if (activeLabel) {
-                    activeLabel.referenced = true;
-                    bindBreakOrContinueFlow(node, activeLabel.breakTarget, activeLabel.continueTarget);
+        var values = value.split(",");
+        switch (opt.element.type) {
+            case "number":
+                return ts.map(values, parseInt);
+            case "string":
+                return ts.map(values, function (v) { return v || ""; });
+            default:
+                return ts.mapDefined(values, function (v) { return parseCustomTypeOption(opt.element, v, errors); });
+        }
+    }
+    ts.parseListTypeOption = parseListTypeOption;
+    function parseCommandLine(commandLine, readFile) {
+        var options = {};
+        var fileNames = [];
+        var projectReferences = undefined;
+        var errors = [];
+        parseStrings(commandLine);
+        return {
+            options: options,
+            fileNames: fileNames,
+            projectReferences: projectReferences,
+            errors: errors
+        };
+        function parseStrings(args) {
+            var i = 0;
+            while (i < args.length) {
+                var s = args[i];
+                i++;
+                if (s.charCodeAt(0) === 64 /* at */) {
+                    parseResponseFile(s.slice(1));
                 }
-            }
-            else {
-                bindBreakOrContinueFlow(node, currentBreakTarget, currentContinueTarget);
-            }
-        }
-        function bindTryStatement(node) {
-            var preFinallyLabel = createBranchLabel();
-            var preTryFlow = currentFlow;
-            bind(node.tryBlock);
-            addAntecedent(preFinallyLabel, currentFlow);
-            var flowAfterTry = currentFlow;
-            var flowAfterCatch = unreachableFlow;
-            if (node.catchClause) {
-                currentFlow = preTryFlow;
-                bind(node.catchClause);
-                addAntecedent(preFinallyLabel, currentFlow);
-                flowAfterCatch = currentFlow;
-            }
-            if (node.finallyBlock) {
-                var preFinallyFlow = { flags: 2048, antecedent: preTryFlow, lock: {} };
-                addAntecedent(preFinallyLabel, preFinallyFlow);
-                currentFlow = finishFlowLabel(preFinallyLabel);
-                bind(node.finallyBlock);
-                if (!(currentFlow.flags & 1)) {
-                    if ((flowAfterTry.flags & 1) && (flowAfterCatch.flags & 1)) {
-                        currentFlow = flowAfterTry === reportedUnreachableFlow || flowAfterCatch === reportedUnreachableFlow
-                            ? reportedUnreachableFlow
-                            : unreachableFlow;
-                    }
-                }
-                if (!(currentFlow.flags & 1)) {
-                    var afterFinallyFlow = { flags: 4096, antecedent: currentFlow };
-                    preFinallyFlow.lock = afterFinallyFlow;
-                    currentFlow = afterFinallyFlow;
-                }
-            }
-            else {
-                currentFlow = finishFlowLabel(preFinallyLabel);
-            }
-        }
-        function bindSwitchStatement(node) {
-            var postSwitchLabel = createBranchLabel();
-            bind(node.expression);
-            var saveBreakTarget = currentBreakTarget;
-            var savePreSwitchCaseFlow = preSwitchCaseFlow;
-            currentBreakTarget = postSwitchLabel;
-            preSwitchCaseFlow = currentFlow;
-            bind(node.caseBlock);
-            addAntecedent(postSwitchLabel, currentFlow);
-            var hasDefault = ts.forEach(node.caseBlock.clauses, function (c) { return c.kind === 267; });
-            node.possiblyExhaustive = !hasDefault && !postSwitchLabel.antecedents;
-            if (!hasDefault) {
-                addAntecedent(postSwitchLabel, createFlowSwitchClause(preSwitchCaseFlow, node, 0, 0));
-            }
-            currentBreakTarget = saveBreakTarget;
-            preSwitchCaseFlow = savePreSwitchCaseFlow;
-            currentFlow = finishFlowLabel(postSwitchLabel);
-        }
-        function bindCaseBlock(node) {
-            var savedSubtreeTransformFlags = subtreeTransformFlags;
-            subtreeTransformFlags = 0;
-            var clauses = node.clauses;
-            var fallthroughFlow = unreachableFlow;
-            for (var i = 0; i < clauses.length; i++) {
-                var clauseStart = i;
-                while (!clauses[i].statements.length && i + 1 < clauses.length) {
-                    bind(clauses[i]);
-                    i++;
-                }
-                var preCaseLabel = createBranchLabel();
-                addAntecedent(preCaseLabel, createFlowSwitchClause(preSwitchCaseFlow, node.parent, clauseStart, i + 1));
-                addAntecedent(preCaseLabel, createFlowSwitchClause(preSwitchCaseFlow, node.parent, clauseStart, i + 1));
-                addAntecedent(preCaseLabel, fallthroughFlow);
-                currentFlow = finishFlowLabel(preCaseLabel);
-                var clause = clauses[i];
-                bind(clause);
-                fallthroughFlow = currentFlow;
-                if (!(currentFlow.flags & 1) && i !== clauses.length - 1 && options.noFallthroughCasesInSwitch) {
-                    errorOnFirstToken(clause, ts.Diagnostics.Fallthrough_case_in_switch);
-                }
-            }
-            clauses.transformFlags = subtreeTransformFlags | 536870912;
-            subtreeTransformFlags |= savedSubtreeTransformFlags;
-        }
-        function bindCaseClause(node) {
-            var saveCurrentFlow = currentFlow;
-            currentFlow = preSwitchCaseFlow;
-            bind(node.expression);
-            currentFlow = saveCurrentFlow;
-            bindEach(node.statements);
-        }
-        function pushActiveLabel(name, breakTarget, continueTarget) {
-            var activeLabel = {
-                name: name,
-                breakTarget: breakTarget,
-                continueTarget: continueTarget,
-                referenced: false
-            };
-            (activeLabels || (activeLabels = [])).push(activeLabel);
-            return activeLabel;
-        }
-        function popActiveLabel() {
-            activeLabels.pop();
-        }
-        function bindLabeledStatement(node) {
-            var preStatementLabel = createLoopLabel();
-            var postStatementLabel = createBranchLabel();
-            bind(node.label);
-            addAntecedent(preStatementLabel, currentFlow);
-            var activeLabel = pushActiveLabel(node.label.escapedText, postStatementLabel, preStatementLabel);
-            bind(node.statement);
-            popActiveLabel();
-            if (!activeLabel.referenced && !options.allowUnusedLabels) {
-                errorOrSuggestionOnFirstToken(ts.unusedLabelIsError(options), node, ts.Diagnostics.Unused_label);
-            }
-            if (!node.statement || node.statement.kind !== 218) {
-                addAntecedent(postStatementLabel, currentFlow);
-                currentFlow = finishFlowLabel(postStatementLabel);
-            }
-        }
-        function bindDestructuringTargetFlow(node) {
-            if (node.kind === 200 && node.operatorToken.kind === 58) {
-                bindAssignmentTargetFlow(node.left);
-            }
-            else {
-                bindAssignmentTargetFlow(node);
-            }
-        }
-        function bindAssignmentTargetFlow(node) {
-            if (isNarrowableReference(node)) {
-                currentFlow = createFlowAssignment(currentFlow, node);
-            }
-            else if (node.kind === 183) {
-                for (var _i = 0, _a = node.elements; _i < _a.length; _i++) {
-                    var e = _a[_i];
-                    if (e.kind === 204) {
-                        bindAssignmentTargetFlow(e.expression);
-                    }
-                    else {
-                        bindDestructuringTargetFlow(e);
-                    }
-                }
-            }
-            else if (node.kind === 184) {
-                for (var _b = 0, _c = node.properties; _b < _c.length; _b++) {
-                    var p = _c[_b];
-                    if (p.kind === 270) {
-                        bindDestructuringTargetFlow(p.initializer);
-                    }
-                    else if (p.kind === 271) {
-                        bindAssignmentTargetFlow(p.name);
-                    }
-                    else if (p.kind === 272) {
-                        bindAssignmentTargetFlow(p.expression);
-                    }
-                }
-            }
-        }
-        function bindLogicalExpression(node, trueTarget, falseTarget) {
-            var preRightLabel = createBranchLabel();
-            if (node.operatorToken.kind === 53) {
-                bindCondition(node.left, preRightLabel, falseTarget);
-            }
-            else {
-                bindCondition(node.left, trueTarget, preRightLabel);
-            }
-            currentFlow = finishFlowLabel(preRightLabel);
-            bind(node.operatorToken);
-            bindCondition(node.right, trueTarget, falseTarget);
-        }
-        function bindPrefixUnaryExpressionFlow(node) {
-            if (node.operator === 51) {
-                var saveTrueTarget = currentTrueTarget;
-                currentTrueTarget = currentFalseTarget;
-                currentFalseTarget = saveTrueTarget;
-                bindEachChild(node);
-                currentFalseTarget = currentTrueTarget;
-                currentTrueTarget = saveTrueTarget;
-            }
-            else {
-                bindEachChild(node);
-                if (node.operator === 43 || node.operator === 44) {
-                    bindAssignmentTargetFlow(node.operand);
-                }
-            }
-        }
-        function bindPostfixUnaryExpressionFlow(node) {
-            bindEachChild(node);
-            if (node.operator === 43 || node.operator === 44) {
-                bindAssignmentTargetFlow(node.operand);
-            }
-        }
-        function bindBinaryExpressionFlow(node) {
-            var operator = node.operatorToken.kind;
-            if (operator === 53 || operator === 54) {
-                if (isTopLevelLogicalExpression(node)) {
-                    var postExpressionLabel = createBranchLabel();
-                    bindLogicalExpression(node, postExpressionLabel, postExpressionLabel);
-                    currentFlow = finishFlowLabel(postExpressionLabel);
-                }
-                else {
-                    bindLogicalExpression(node, currentTrueTarget, currentFalseTarget);
-                }
-            }
-            else {
-                bindEachChild(node);
-                if (ts.isAssignmentOperator(operator) && !ts.isAssignmentTarget(node)) {
-                    bindAssignmentTargetFlow(node.left);
-                    if (operator === 58 && node.left.kind === 186) {
-                        var elementAccess = node.left;
-                        if (isNarrowableOperand(elementAccess.expression)) {
-                            currentFlow = createFlowArrayMutation(currentFlow, node);
-                        }
-                    }
-                }
-            }
-        }
-        function bindDeleteExpressionFlow(node) {
-            bindEachChild(node);
-            if (node.expression.kind === 185) {
-                bindAssignmentTargetFlow(node.expression);
-            }
-        }
-        function bindConditionalExpressionFlow(node) {
-            var trueLabel = createBranchLabel();
-            var falseLabel = createBranchLabel();
-            var postExpressionLabel = createBranchLabel();
-            bindCondition(node.condition, trueLabel, falseLabel);
-            currentFlow = finishFlowLabel(trueLabel);
-            bind(node.questionToken);
-            bind(node.whenTrue);
-            addAntecedent(postExpressionLabel, currentFlow);
-            currentFlow = finishFlowLabel(falseLabel);
-            bind(node.colonToken);
-            bind(node.whenFalse);
-            addAntecedent(postExpressionLabel, currentFlow);
-            currentFlow = finishFlowLabel(postExpressionLabel);
-        }
-        function bindInitializedVariableFlow(node) {
-            var name = !ts.isOmittedExpression(node) ? node.name : undefined;
-            if (ts.isBindingPattern(name)) {
-                for (var _i = 0, _a = name.elements; _i < _a.length; _i++) {
-                    var child = _a[_i];
-                    bindInitializedVariableFlow(child);
-                }
-            }
-            else {
-                currentFlow = createFlowAssignment(currentFlow, node);
-            }
-        }
-        function bindVariableDeclarationFlow(node) {
-            bindEachChild(node);
-            if (node.initializer || ts.isForInOrOfStatement(node.parent.parent)) {
-                bindInitializedVariableFlow(node);
-            }
-        }
-        function bindJSDocTypeAlias(node) {
-            if (node.fullName) {
-                setParentPointers(node, node.fullName);
-            }
-        }
-        function bindCallExpressionFlow(node) {
-            var expr = node.expression;
-            while (expr.kind === 191) {
-                expr = expr.expression;
-            }
-            if (expr.kind === 192 || expr.kind === 193) {
-                bindEach(node.typeArguments);
-                bindEach(node.arguments);
-                bind(node.expression);
-            }
-            else {
-                bindEachChild(node);
-            }
-            if (node.expression.kind === 185) {
-                var propertyAccess = node.expression;
-                if (isNarrowableOperand(propertyAccess.expression) && ts.isPushOrUnshiftIdentifier(propertyAccess.name)) {
-                    currentFlow = createFlowArrayMutation(currentFlow, node);
-                }
-            }
-        }
-        function getContainerFlags(node) {
-            switch (node.kind) {
-                case 205:
-                case 235:
-                case 238:
-                case 184:
-                case 166:
-                case 287:
-                case 263:
-                    return 1;
-                case 236:
-                    return 1 | 64;
-                case 239:
-                case 237:
-                case 177:
-                    return 1 | 32;
-                case 274:
-                    return 1 | 4 | 32;
-                case 154:
-                    if (ts.isObjectLiteralOrClassExpressionMethod(node)) {
-                        return 1 | 4 | 32 | 8 | 128;
-                    }
-                case 155:
-                case 234:
-                case 153:
-                case 156:
-                case 157:
-                case 158:
-                case 288:
-                case 284:
-                case 163:
-                case 159:
-                case 160:
-                case 164:
-                    return 1 | 4 | 32 | 8;
-                case 192:
-                case 193:
-                    return 1 | 4 | 32 | 8 | 16;
-                case 240:
-                    return 4;
-                case 152:
-                    return node.initializer ? 4 : 0;
-                case 269:
-                case 220:
-                case 221:
-                case 222:
-                case 241:
-                    return 2;
-                case 213:
-                    return ts.isFunctionLike(node.parent) ? 0 : 2;
-            }
-            return 0;
-        }
-        function addToContainerChain(next) {
-            if (lastContainer) {
-                lastContainer.nextContainer = next;
-            }
-            lastContainer = next;
-        }
-        function declareSymbolAndAddToSymbolTable(node, symbolFlags, symbolExcludes) {
-            switch (container.kind) {
-                case 239:
-                    return declareModuleMember(node, symbolFlags, symbolExcludes);
-                case 274:
-                    return declareSourceFileMember(node, symbolFlags, symbolExcludes);
-                case 205:
-                case 235:
-                    return declareClassMember(node, symbolFlags, symbolExcludes);
-                case 238:
-                    return declareSymbol(container.symbol.exports, container.symbol, node, symbolFlags, symbolExcludes);
-                case 166:
-                case 287:
-                case 184:
-                case 236:
-                case 263:
-                    return declareSymbol(container.symbol.members, container.symbol, node, symbolFlags, symbolExcludes);
-                case 163:
-                case 164:
-                case 158:
-                case 159:
-                case 288:
-                case 160:
-                case 154:
-                case 153:
-                case 155:
-                case 156:
-                case 157:
-                case 234:
-                case 192:
-                case 193:
-                case 284:
-                case 297:
-                case 292:
-                case 237:
-                case 177:
-                    return declareSymbol(container.locals, undefined, node, symbolFlags, symbolExcludes);
-            }
-        }
-        function declareClassMember(node, symbolFlags, symbolExcludes) {
-            return ts.hasModifier(node, 32)
-                ? declareSymbol(container.symbol.exports, container.symbol, node, symbolFlags, symbolExcludes)
-                : declareSymbol(container.symbol.members, container.symbol, node, symbolFlags, symbolExcludes);
-        }
-        function declareSourceFileMember(node, symbolFlags, symbolExcludes) {
-            return ts.isExternalModule(file)
-                ? declareModuleMember(node, symbolFlags, symbolExcludes)
-                : declareSymbol(file.locals, undefined, node, symbolFlags, symbolExcludes);
-        }
-        function hasExportDeclarations(node) {
-            var body = node.kind === 274 ? node : node.body;
-            if (body && (body.kind === 274 || body.kind === 240)) {
-                for (var _i = 0, _a = body.statements; _i < _a.length; _i++) {
-                    var stat = _a[_i];
-                    if (stat.kind === 250 || stat.kind === 249) {
-                        return true;
-                    }
-                }
-            }
-            return false;
-        }
-        function setExportContextFlag(node) {
-            if (node.flags & 4194304 && !hasExportDeclarations(node)) {
-                node.flags |= 32;
-            }
-            else {
-                node.flags &= ~32;
-            }
-        }
-        function bindModuleDeclaration(node) {
-            setExportContextFlag(node);
-            if (ts.isAmbientModule(node)) {
-                if (ts.hasModifier(node, 1)) {
-                    errorOnFirstToken(node, ts.Diagnostics.export_modifier_cannot_be_applied_to_ambient_modules_and_module_augmentations_since_they_are_always_visible);
-                }
-                if (ts.isModuleAugmentationExternal(node)) {
-                    declareModuleSymbol(node);
-                }
-                else {
-                    var pattern = void 0;
-                    if (node.name.kind === 9) {
-                        var text = node.name.text;
-                        if (ts.hasZeroOrOneAsteriskCharacter(text)) {
-                            pattern = ts.tryParsePattern(text);
+                else if (s.charCodeAt(0) === 45 /* minus */) {
+                    var opt = getOptionFromName(s.slice(s.charCodeAt(1) === 45 /* minus */ ? 2 : 1), /*allowShort*/ true);
+                    if (opt) {
+                        if (opt.isTSConfigOnly) {
+                            errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Option_0_can_only_be_specified_in_tsconfig_json_file, opt.name));
                         }
                         else {
-                            errorOnFirstToken(node.name, ts.Diagnostics.Pattern_0_can_have_at_most_one_Asterisk_character, text);
+                            // Check to see if no argument was provided (e.g. "--locale" is the last command-line argument).
+                            if (!args[i] && opt.type !== "boolean") {
+                                errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Compiler_option_0_expects_an_argument, opt.name));
+                            }
+                            switch (opt.type) {
+                                case "number":
+                                    options[opt.name] = parseInt(args[i]);
+                                    i++;
+                                    break;
+                                case "boolean":
+                                    // boolean flag has optional value true, false, others
+                                    var optValue = args[i];
+                                    options[opt.name] = optValue !== "false";
+                                    // consume next argument as boolean flag value
+                                    if (optValue === "false" || optValue === "true") {
+                                        i++;
+                                    }
+                                    break;
+                                case "string":
+                                    options[opt.name] = args[i] || "";
+                                    i++;
+                                    break;
+                                case "list":
+                                    var result = parseListTypeOption(opt, args[i], errors);
+                                    options[opt.name] = result || [];
+                                    if (result) {
+                                        i++;
+                                    }
+                                    break;
+                                // If not a primitive, the possible types are specified in what is effectively a map of options.
+                                default:
+                                    options[opt.name] = parseCustomTypeOption(opt, args[i], errors);
+                                    i++;
+                                    break;
+                            }
                         }
                     }
-                    var symbol = declareSymbolAndAddToSymbolTable(node, 512, 67215503);
-                    file.patternAmbientModules = ts.append(file.patternAmbientModules, pattern && { pattern: pattern, symbol: symbol });
-                }
-            }
-            else {
-                var state = declareModuleSymbol(node);
-                if (state !== 0) {
-                    var symbol = node.symbol;
-                    symbol.constEnumOnlyModule = (!(symbol.flags & (16 | 32 | 256)))
-                        && state === 2
-                        && symbol.constEnumOnlyModule !== false;
-                }
-            }
-        }
-        function declareModuleSymbol(node) {
-            var state = getModuleInstanceState(node);
-            var instantiated = state !== 0;
-            declareSymbolAndAddToSymbolTable(node, instantiated ? 512 : 1024, instantiated ? 67215503 : 0);
-            return state;
-        }
-        function bindFunctionOrConstructorType(node) {
-            var symbol = createSymbol(131072, getDeclarationName(node));
-            addDeclarationToSymbol(symbol, node, 131072);
-            var typeLiteralSymbol = createSymbol(2048, "__type");
-            addDeclarationToSymbol(typeLiteralSymbol, node, 2048);
-            typeLiteralSymbol.members = ts.createSymbolTable();
-            typeLiteralSymbol.members.set(symbol.escapedName, symbol);
-        }
-        function bindObjectLiteralExpression(node) {
-            var ElementKind;
-            (function (ElementKind) {
-                ElementKind[ElementKind["Property"] = 1] = "Property";
-                ElementKind[ElementKind["Accessor"] = 2] = "Accessor";
-            })(ElementKind || (ElementKind = {}));
-            if (inStrictMode) {
-                var seen = ts.createUnderscoreEscapedMap();
-                for (var _i = 0, _a = node.properties; _i < _a.length; _i++) {
-                    var prop = _a[_i];
-                    if (prop.kind === 272 || prop.name.kind !== 71) {
-                        continue;
-                    }
-                    var identifier = prop.name;
-                    var currentKind = prop.kind === 270 || prop.kind === 271 || prop.kind === 154
-                        ? 1
-                        : 2;
-                    var existingKind = seen.get(identifier.escapedText);
-                    if (!existingKind) {
-                        seen.set(identifier.escapedText, currentKind);
-                        continue;
-                    }
-                    if (currentKind === 1 && existingKind === 1) {
-                        var span = ts.getErrorSpanForNode(file, identifier);
-                        file.bindDiagnostics.push(ts.createFileDiagnostic(file, span.start, span.length, ts.Diagnostics.An_object_literal_cannot_have_multiple_properties_with_the_same_name_in_strict_mode));
-                    }
-                }
-            }
-            return bindAnonymousDeclaration(node, 4096, "__object");
-        }
-        function bindJsxAttributes(node) {
-            return bindAnonymousDeclaration(node, 4096, "__jsxAttributes");
-        }
-        function bindJsxAttribute(node, symbolFlags, symbolExcludes) {
-            return declareSymbolAndAddToSymbolTable(node, symbolFlags, symbolExcludes);
-        }
-        function bindAnonymousDeclaration(node, symbolFlags, name) {
-            var symbol = createSymbol(symbolFlags, name);
-            if (symbolFlags & (8 | 106500)) {
-                symbol.parent = container.symbol;
-            }
-            addDeclarationToSymbol(symbol, node, symbolFlags);
-            return symbol;
-        }
-        function bindBlockScopedDeclaration(node, symbolFlags, symbolExcludes) {
-            switch (blockScopeContainer.kind) {
-                case 239:
-                    declareModuleMember(node, symbolFlags, symbolExcludes);
-                    break;
-                case 274:
-                    if (ts.isExternalOrCommonJsModule(container)) {
-                        declareModuleMember(node, symbolFlags, symbolExcludes);
-                        break;
-                    }
-                default:
-                    if (!blockScopeContainer.locals) {
-                        blockScopeContainer.locals = ts.createSymbolTable();
-                        addToContainerChain(blockScopeContainer);
-                    }
-                    declareSymbol(blockScopeContainer.locals, undefined, node, symbolFlags, symbolExcludes);
-            }
-        }
-        function bindBlockScopedVariableDeclaration(node) {
-            bindBlockScopedDeclaration(node, 2, 67216319);
-        }
-        function delayedBindJSDocTypedefTag() {
-            if (!delayedTypeAliases) {
-                return;
-            }
-            var saveContainer = container;
-            var saveLastContainer = lastContainer;
-            var saveBlockScopeContainer = blockScopeContainer;
-            var saveParent = parent;
-            var saveCurrentFlow = currentFlow;
-            for (var _i = 0, delayedTypeAliases_1 = delayedTypeAliases; _i < delayedTypeAliases_1.length; _i++) {
-                var typeAlias = delayedTypeAliases_1[_i];
-                var host = ts.getJSDocHost(typeAlias);
-                container = ts.findAncestor(host.parent, function (n) { return !!(getContainerFlags(n) & 1); }) || file;
-                blockScopeContainer = ts.getEnclosingBlockScopeContainer(host) || file;
-                currentFlow = { flags: 2 };
-                parent = typeAlias;
-                bind(typeAlias.typeExpression);
-                if (!typeAlias.fullName || typeAlias.fullName.kind === 71) {
-                    parent = typeAlias.parent;
-                    bindBlockScopedDeclaration(typeAlias, 524288, 67901928);
-                }
-                else {
-                    bind(typeAlias.fullName);
-                }
-            }
-            container = saveContainer;
-            lastContainer = saveLastContainer;
-            blockScopeContainer = saveBlockScopeContainer;
-            parent = saveParent;
-            currentFlow = saveCurrentFlow;
-        }
-        function checkStrictModeIdentifier(node) {
-            if (inStrictMode &&
-                node.originalKeywordKind >= 108 &&
-                node.originalKeywordKind <= 116 &&
-                !ts.isIdentifierName(node) &&
-                !(node.flags & 4194304)) {
-                if (!file.parseDiagnostics.length) {
-                    file.bindDiagnostics.push(createDiagnosticForNode(node, getStrictModeIdentifierMessage(node), ts.declarationNameToString(node)));
-                }
-            }
-        }
-        function getStrictModeIdentifierMessage(node) {
-            if (ts.getContainingClass(node)) {
-                return ts.Diagnostics.Identifier_expected_0_is_a_reserved_word_in_strict_mode_Class_definitions_are_automatically_in_strict_mode;
-            }
-            if (file.externalModuleIndicator) {
-                return ts.Diagnostics.Identifier_expected_0_is_a_reserved_word_in_strict_mode_Modules_are_automatically_in_strict_mode;
-            }
-            return ts.Diagnostics.Identifier_expected_0_is_a_reserved_word_in_strict_mode;
-        }
-        function checkStrictModeBinaryExpression(node) {
-            if (inStrictMode && ts.isLeftHandSideExpression(node.left) && ts.isAssignmentOperator(node.operatorToken.kind)) {
-                checkStrictModeEvalOrArguments(node, node.left);
-            }
-        }
-        function checkStrictModeCatchClause(node) {
-            if (inStrictMode && node.variableDeclaration) {
-                checkStrictModeEvalOrArguments(node, node.variableDeclaration.name);
-            }
-        }
-        function checkStrictModeDeleteExpression(node) {
-            if (inStrictMode && node.expression.kind === 71) {
-                var span = ts.getErrorSpanForNode(file, node.expression);
-                file.bindDiagnostics.push(ts.createFileDiagnostic(file, span.start, span.length, ts.Diagnostics.delete_cannot_be_called_on_an_identifier_in_strict_mode));
-            }
-        }
-        function isEvalOrArgumentsIdentifier(node) {
-            return ts.isIdentifier(node) && (node.escapedText === "eval" || node.escapedText === "arguments");
-        }
-        function checkStrictModeEvalOrArguments(contextNode, name) {
-            if (name && name.kind === 71) {
-                var identifier = name;
-                if (isEvalOrArgumentsIdentifier(identifier)) {
-                    var span = ts.getErrorSpanForNode(file, name);
-                    file.bindDiagnostics.push(ts.createFileDiagnostic(file, span.start, span.length, getStrictModeEvalOrArgumentsMessage(contextNode), ts.idText(identifier)));
-                }
-            }
-        }
-        function getStrictModeEvalOrArgumentsMessage(node) {
-            if (ts.getContainingClass(node)) {
-                return ts.Diagnostics.Invalid_use_of_0_Class_definitions_are_automatically_in_strict_mode;
-            }
-            if (file.externalModuleIndicator) {
-                return ts.Diagnostics.Invalid_use_of_0_Modules_are_automatically_in_strict_mode;
-            }
-            return ts.Diagnostics.Invalid_use_of_0_in_strict_mode;
-        }
-        function checkStrictModeFunctionName(node) {
-            if (inStrictMode) {
-                checkStrictModeEvalOrArguments(node, node.name);
-            }
-        }
-        function getStrictModeBlockScopeFunctionDeclarationMessage(node) {
-            if (ts.getContainingClass(node)) {
-                return ts.Diagnostics.Function_declarations_are_not_allowed_inside_blocks_in_strict_mode_when_targeting_ES3_or_ES5_Class_definitions_are_automatically_in_strict_mode;
-            }
-            if (file.externalModuleIndicator) {
-                return ts.Diagnostics.Function_declarations_are_not_allowed_inside_blocks_in_strict_mode_when_targeting_ES3_or_ES5_Modules_are_automatically_in_strict_mode;
-            }
-            return ts.Diagnostics.Function_declarations_are_not_allowed_inside_blocks_in_strict_mode_when_targeting_ES3_or_ES5;
-        }
-        function checkStrictModeFunctionDeclaration(node) {
-            if (languageVersion < 2) {
-                if (blockScopeContainer.kind !== 274 &&
-                    blockScopeContainer.kind !== 239 &&
-                    !ts.isFunctionLike(blockScopeContainer)) {
-                    var errorSpan = ts.getErrorSpanForNode(file, node);
-                    file.bindDiagnostics.push(ts.createFileDiagnostic(file, errorSpan.start, errorSpan.length, getStrictModeBlockScopeFunctionDeclarationMessage(node)));
-                }
-            }
-        }
-        function checkStrictModeNumericLiteral(node) {
-            if (inStrictMode && node.numericLiteralFlags & 32) {
-                file.bindDiagnostics.push(createDiagnosticForNode(node, ts.Diagnostics.Octal_literals_are_not_allowed_in_strict_mode));
-            }
-        }
-        function checkStrictModePostfixUnaryExpression(node) {
-            if (inStrictMode) {
-                checkStrictModeEvalOrArguments(node, node.operand);
-            }
-        }
-        function checkStrictModePrefixUnaryExpression(node) {
-            if (inStrictMode) {
-                if (node.operator === 43 || node.operator === 44) {
-                    checkStrictModeEvalOrArguments(node, node.operand);
-                }
-            }
-        }
-        function checkStrictModeWithStatement(node) {
-            if (inStrictMode) {
-                errorOnFirstToken(node, ts.Diagnostics.with_statements_are_not_allowed_in_strict_mode);
-            }
-        }
-        function errorOnFirstToken(node, message, arg0, arg1, arg2) {
-            var span = ts.getSpanOfTokenAtPosition(file, node.pos);
-            file.bindDiagnostics.push(ts.createFileDiagnostic(file, span.start, span.length, message, arg0, arg1, arg2));
-        }
-        function errorOrSuggestionOnFirstToken(isError, node, message, arg0, arg1, arg2) {
-            var span = ts.getSpanOfTokenAtPosition(file, node.pos);
-            var diag = ts.createFileDiagnostic(file, span.start, span.length, message, arg0, arg1, arg2);
-            if (isError) {
-                file.bindDiagnostics.push(diag);
-            }
-            else {
-                file.bindSuggestionDiagnostics = ts.append(file.bindSuggestionDiagnostics, __assign({}, diag, { category: ts.DiagnosticCategory.Suggestion }));
-            }
-        }
-        function bind(node) {
-            if (!node) {
-                return;
-            }
-            node.parent = parent;
-            var saveInStrictMode = inStrictMode;
-            bindWorker(node);
-            if (node.kind > 145) {
-                var saveParent = parent;
-                parent = node;
-                var containerFlags = getContainerFlags(node);
-                if (containerFlags === 0) {
-                    bindChildren(node);
-                }
-                else {
-                    bindContainer(node, containerFlags);
-                }
-                parent = saveParent;
-            }
-            else if (!skipTransformFlagAggregation && (node.transformFlags & 536870912) === 0) {
-                subtreeTransformFlags |= computeTransformFlagsForNode(node, 0);
-                bindJSDoc(node);
-            }
-            inStrictMode = saveInStrictMode;
-        }
-        function bindJSDoc(node) {
-            if (ts.hasJSDocNodes(node)) {
-                if (ts.isInJavaScriptFile(node)) {
-                    for (var _i = 0, _a = node.jsDoc; _i < _a.length; _i++) {
-                        var j = _a[_i];
-                        bind(j);
-                    }
-                }
-                else {
-                    for (var _b = 0, _c = node.jsDoc; _b < _c.length; _b++) {
-                        var j = _c[_b];
-                        setParentPointers(node, j);
-                    }
-                }
-            }
-        }
-        function updateStrictModeStatementList(statements) {
-            if (!inStrictMode) {
-                for (var _i = 0, statements_1 = statements; _i < statements_1.length; _i++) {
-                    var statement = statements_1[_i];
-                    if (!ts.isPrologueDirective(statement)) {
-                        return;
-                    }
-                    if (isUseStrictPrologueDirective(statement)) {
-                        inStrictMode = true;
-                        return;
-                    }
-                }
-            }
-        }
-        function isUseStrictPrologueDirective(node) {
-            var nodeText = ts.getSourceTextOfNodeFromSourceFile(file, node.expression);
-            return nodeText === '"use strict"' || nodeText === "'use strict'";
-        }
-        function bindWorker(node) {
-            switch (node.kind) {
-                case 71:
-                    if (node.isInJSDocNamespace) {
-                        var parentNode = node.parent;
-                        while (parentNode && !ts.isJSDocTypeAlias(parentNode)) {
-                            parentNode = parentNode.parent;
-                        }
-                        bindBlockScopedDeclaration(parentNode, 524288, 67901928);
-                        break;
-                    }
-                case 99:
-                    if (currentFlow && (ts.isExpression(node) || parent.kind === 271)) {
-                        node.flowNode = currentFlow;
-                    }
-                    return checkStrictModeIdentifier(node);
-                case 185:
-                    if (currentFlow && isNarrowableReference(node)) {
-                        node.flowNode = currentFlow;
-                    }
-                    if (ts.isSpecialPropertyDeclaration(node)) {
-                        bindSpecialPropertyDeclaration(node);
-                    }
-                    break;
-                case 200:
-                    var specialKind = ts.getSpecialPropertyAssignmentKind(node);
-                    switch (specialKind) {
-                        case 1:
-                            bindExportsPropertyAssignment(node);
-                            break;
-                        case 2:
-                            bindModuleExportsAssignment(node);
-                            break;
-                        case 3:
-                            bindPrototypePropertyAssignment(node.left, node);
-                            break;
-                        case 6:
-                            bindPrototypeAssignment(node);
-                            break;
-                        case 4:
-                            bindThisPropertyAssignment(node);
-                            break;
-                        case 5:
-                            bindSpecialPropertyAssignment(node);
-                            break;
-                        case 0:
-                            break;
-                        default:
-                            ts.Debug.fail("Unknown special property assignment kind");
-                    }
-                    return checkStrictModeBinaryExpression(node);
-                case 269:
-                    return checkStrictModeCatchClause(node);
-                case 194:
-                    return checkStrictModeDeleteExpression(node);
-                case 8:
-                    return checkStrictModeNumericLiteral(node);
-                case 199:
-                    return checkStrictModePostfixUnaryExpression(node);
-                case 198:
-                    return checkStrictModePrefixUnaryExpression(node);
-                case 226:
-                    return checkStrictModeWithStatement(node);
-                case 174:
-                    seenThisKeyword = true;
-                    return;
-                case 161:
-                    break;
-                case 148:
-                    return bindTypeParameter(node);
-                case 149:
-                    return bindParameter(node);
-                case 232:
-                    return bindVariableDeclarationOrBindingElement(node);
-                case 182:
-                    node.flowNode = currentFlow;
-                    return bindVariableDeclarationOrBindingElement(node);
-                case 152:
-                case 151:
-                    return bindPropertyWorker(node);
-                case 270:
-                case 271:
-                    return bindPropertyOrMethodOrAccessor(node, 4, 0);
-                case 273:
-                    return bindPropertyOrMethodOrAccessor(node, 8, 68008959);
-                case 158:
-                case 159:
-                case 160:
-                    return declareSymbolAndAddToSymbolTable(node, 131072, 0);
-                case 154:
-                case 153:
-                    return bindPropertyOrMethodOrAccessor(node, 8192 | (node.questionToken ? 16777216 : 0), ts.isObjectLiteralMethod(node) ? 0 : 67208127);
-                case 234:
-                    return bindFunctionDeclaration(node);
-                case 155:
-                    return declareSymbolAndAddToSymbolTable(node, 16384, 0);
-                case 156:
-                    return bindPropertyOrMethodOrAccessor(node, 32768, 67150783);
-                case 157:
-                    return bindPropertyOrMethodOrAccessor(node, 65536, 67183551);
-                case 163:
-                case 284:
-                case 288:
-                case 164:
-                    return bindFunctionOrConstructorType(node);
-                case 166:
-                case 287:
-                case 177:
-                    return bindAnonymousTypeWorker(node);
-                case 184:
-                    return bindObjectLiteralExpression(node);
-                case 192:
-                case 193:
-                    return bindFunctionExpression(node);
-                case 187:
-                    if (ts.isInJavaScriptFile(node)) {
-                        bindCallExpression(node);
-                    }
-                    break;
-                case 205:
-                case 235:
-                    inStrictMode = true;
-                    return bindClassLikeDeclaration(node);
-                case 236:
-                    return bindBlockScopedDeclaration(node, 64, 67901832);
-                case 237:
-                    return bindBlockScopedDeclaration(node, 524288, 67901928);
-                case 238:
-                    return bindEnumDeclaration(node);
-                case 239:
-                    return bindModuleDeclaration(node);
-                case 263:
-                    return bindJsxAttributes(node);
-                case 262:
-                    return bindJsxAttribute(node, 4, 0);
-                case 243:
-                case 246:
-                case 248:
-                case 252:
-                    return declareSymbolAndAddToSymbolTable(node, 2097152, 2097152);
-                case 242:
-                    return bindNamespaceExportDeclaration(node);
-                case 245:
-                    return bindImportClause(node);
-                case 250:
-                    return bindExportDeclaration(node);
-                case 249:
-                    return bindExportAssignment(node);
-                case 274:
-                    updateStrictModeStatementList(node.statements);
-                    return bindSourceFileIfExternalModule();
-                case 213:
-                    if (!ts.isFunctionLike(node.parent)) {
-                        return;
-                    }
-                case 240:
-                    return updateStrictModeStatementList(node.statements);
-                case 293:
-                    if (node.parent.kind === 288) {
-                        return bindParameter(node);
-                    }
-                    if (node.parent.kind !== 287) {
-                        break;
-                    }
-                case 298:
-                    var propTag = node;
-                    var flags = propTag.isBracketed || propTag.typeExpression && propTag.typeExpression.type.kind === 283 ?
-                        4 | 16777216 :
-                        4;
-                    return declareSymbolAndAddToSymbolTable(propTag, flags, 0);
-                case 297:
-                case 292:
-                    return (delayedTypeAliases || (delayedTypeAliases = [])).push(node);
-            }
-        }
-        function bindPropertyWorker(node) {
-            return bindPropertyOrMethodOrAccessor(node, 4 | (node.questionToken ? 16777216 : 0), 0);
-        }
-        function bindAnonymousTypeWorker(node) {
-            return bindAnonymousDeclaration(node, 2048, "__type");
-        }
-        function bindSourceFileIfExternalModule() {
-            setExportContextFlag(file);
-            if (ts.isExternalModule(file)) {
-                bindSourceFileAsExternalModule();
-            }
-            else if (ts.isJsonSourceFile(file)) {
-                bindSourceFileAsExternalModule();
-                var originalSymbol = file.symbol;
-                declareSymbol(file.symbol.exports, file.symbol, file, 4, 67108863);
-                file.symbol = originalSymbol;
-            }
-        }
-        function bindSourceFileAsExternalModule() {
-            bindAnonymousDeclaration(file, 512, "\"" + ts.removeFileExtension(file.fileName) + "\"");
-        }
-        function bindExportAssignment(node) {
-            if (!container.symbol || !container.symbol.exports) {
-                bindAnonymousDeclaration(node, 2097152, getDeclarationName(node));
-            }
-            else {
-                var flags = node.kind === 249 && ts.exportAssignmentIsAlias(node)
-                    ? 2097152
-                    : 4;
-                declareSymbol(container.symbol.exports, container.symbol, node, flags, 67108863);
-            }
-        }
-        function bindNamespaceExportDeclaration(node) {
-            if (node.modifiers && node.modifiers.length) {
-                file.bindDiagnostics.push(createDiagnosticForNode(node, ts.Diagnostics.Modifiers_cannot_appear_here));
-            }
-            if (node.parent.kind !== 274) {
-                file.bindDiagnostics.push(createDiagnosticForNode(node, ts.Diagnostics.Global_module_exports_may_only_appear_at_top_level));
-                return;
-            }
-            else {
-                var parent_1 = node.parent;
-                if (!ts.isExternalModule(parent_1)) {
-                    file.bindDiagnostics.push(createDiagnosticForNode(node, ts.Diagnostics.Global_module_exports_may_only_appear_in_module_files));
-                    return;
-                }
-                if (!parent_1.isDeclarationFile) {
-                    file.bindDiagnostics.push(createDiagnosticForNode(node, ts.Diagnostics.Global_module_exports_may_only_appear_in_declaration_files));
-                    return;
-                }
-            }
-            file.symbol.globalExports = file.symbol.globalExports || ts.createSymbolTable();
-            declareSymbol(file.symbol.globalExports, file.symbol, node, 2097152, 2097152);
-        }
-        function bindExportDeclaration(node) {
-            if (!container.symbol || !container.symbol.exports) {
-                bindAnonymousDeclaration(node, 8388608, getDeclarationName(node));
-            }
-            else if (!node.exportClause) {
-                declareSymbol(container.symbol.exports, container.symbol, node, 8388608, 0);
-            }
-        }
-        function bindImportClause(node) {
-            if (node.name) {
-                declareSymbolAndAddToSymbolTable(node, 2097152, 2097152);
-            }
-        }
-        function setCommonJsModuleIndicator(node) {
-            if (!file.commonJsModuleIndicator) {
-                file.commonJsModuleIndicator = node;
-                if (!file.externalModuleIndicator) {
-                    bindSourceFileAsExternalModule();
-                }
-            }
-        }
-        function bindExportsPropertyAssignment(node) {
-            setCommonJsModuleIndicator(node);
-            var lhs = node.left;
-            var symbol = forEachIdentifierInEntityName(lhs.expression, undefined, function (id, symbol) {
-                if (symbol) {
-                    addDeclarationToSymbol(symbol, id, 1536 | 67108864);
-                }
-                return symbol;
-            });
-            if (symbol) {
-                var flags = ts.isClassExpression(node.right) ?
-                    4 | 1048576 | 32 :
-                    4 | 1048576;
-                declareSymbol(symbol.exports, symbol, lhs, flags, 0);
-            }
-        }
-        function bindModuleExportsAssignment(node) {
-            var assignedExpression = ts.getRightMostAssignedExpression(node.right);
-            if (ts.isEmptyObjectLiteral(assignedExpression) || container === file && isExportsOrModuleExportsOrAlias(file, assignedExpression)) {
-                setCommonJsModuleIndicator(node);
-                return;
-            }
-            setCommonJsModuleIndicator(node);
-            var flags = ts.exportAssignmentIsAlias(node)
-                ? 2097152
-                : 4 | 1048576 | 512;
-            declareSymbol(file.symbol.exports, file.symbol, node, flags, 0);
-        }
-        function bindThisPropertyAssignment(node) {
-            ts.Debug.assert(ts.isInJavaScriptFile(node));
-            var thisContainer = ts.getThisContainer(node, false);
-            switch (thisContainer.kind) {
-                case 234:
-                case 192:
-                    var constructorSymbol = thisContainer.symbol;
-                    if (ts.isBinaryExpression(thisContainer.parent) && thisContainer.parent.operatorToken.kind === 58) {
-                        var l = thisContainer.parent.left;
-                        if (ts.isPropertyAccessEntityNameExpression(l) && ts.isPrototypeAccess(l.expression)) {
-                            constructorSymbol = lookupSymbolForPropertyAccess(l.expression.expression, thisParentContainer);
-                        }
-                    }
-                    if (constructorSymbol) {
-                        constructorSymbol.members = constructorSymbol.members || ts.createSymbolTable();
-                        declareSymbol(constructorSymbol.members, constructorSymbol, node, 4, 0 & ~4);
-                    }
-                    break;
-                case 155:
-                case 152:
-                case 154:
-                case 156:
-                case 157:
-                    var containingClass = thisContainer.parent;
-                    var symbolTable = ts.hasModifier(thisContainer, 32) ? containingClass.symbol.exports : containingClass.symbol.members;
-                    declareSymbol(symbolTable, containingClass.symbol, node, 4, 0, true);
-                    break;
-                case 274:
-                    break;
-                default:
-                    ts.Debug.fail(ts.Debug.showSyntaxKind(thisContainer));
-            }
-        }
-        function bindSpecialPropertyDeclaration(node) {
-            if (node.expression.kind === 99) {
-                bindThisPropertyAssignment(node);
-            }
-            else if (ts.isPropertyAccessEntityNameExpression(node) && node.parent.parent.kind === 274) {
-                if (ts.isPrototypeAccess(node.expression)) {
-                    bindPrototypePropertyAssignment(node, node.parent);
-                }
-                else {
-                    bindStaticPropertyAssignment(node);
-                }
-            }
-        }
-        function bindPrototypeAssignment(node) {
-            node.left.parent = node;
-            node.right.parent = node;
-            var lhs = node.left;
-            bindPropertyAssignment(lhs, lhs, false);
-        }
-        function bindPrototypePropertyAssignment(lhs, parent) {
-            var classPrototype = lhs.expression;
-            var constructorFunction = classPrototype.expression;
-            lhs.parent = parent;
-            constructorFunction.parent = classPrototype;
-            classPrototype.parent = lhs;
-            bindPropertyAssignment(constructorFunction, lhs, true);
-        }
-        function bindSpecialPropertyAssignment(node) {
-            var lhs = node.left;
-            node.left.parent = node;
-            node.right.parent = node;
-            if (ts.isIdentifier(lhs.expression) && container === file && isNameOfExportsOrModuleExportsAliasDeclaration(file, lhs.expression)) {
-                bindExportsPropertyAssignment(node);
-            }
-            else {
-                bindStaticPropertyAssignment(lhs);
-            }
-        }
-        function bindStaticPropertyAssignment(node) {
-            node.expression.parent = node;
-            bindPropertyAssignment(node.expression, node, false);
-        }
-        function bindPropertyAssignment(name, propertyAccess, isPrototypeProperty) {
-            var namespaceSymbol = lookupSymbolForPropertyAccess(name);
-            var isToplevelNamespaceableInitializer = ts.isBinaryExpression(propertyAccess.parent)
-                ? getParentOfBinaryExpression(propertyAccess.parent).parent.kind === 274 &&
-                    !!ts.getJavascriptInitializer(ts.getInitializerOfBinaryExpression(propertyAccess.parent), ts.isPrototypeAccess(propertyAccess.parent.left))
-                : propertyAccess.parent.parent.kind === 274;
-            if (!isPrototypeProperty && (!namespaceSymbol || !(namespaceSymbol.flags & 1920)) && isToplevelNamespaceableInitializer) {
-                var flags_1 = 1536 | 67108864;
-                var excludeFlags_1 = 67215503 & ~67108864;
-                namespaceSymbol = forEachIdentifierInEntityName(propertyAccess.expression, namespaceSymbol, function (id, symbol, parent) {
-                    if (symbol) {
-                        addDeclarationToSymbol(symbol, id, flags_1);
-                        return symbol;
-                    }
                     else {
-                        return declareSymbol(parent ? parent.exports : container.locals, parent, id, flags_1, excludeFlags_1);
+                        errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Unknown_compiler_option_0, s));
                     }
-                });
+                }
+                else {
+                    fileNames.push(s);
+                }
             }
-            if (!namespaceSymbol || !isJavascriptContainer(namespaceSymbol)) {
+        }
+        function parseResponseFile(fileName) {
+            var text = readFile ? readFile(fileName) : ts.sys.readFile(fileName);
+            if (!text) {
+                errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.File_0_not_found, fileName));
                 return;
             }
-            var symbolTable = isPrototypeProperty ?
-                (namespaceSymbol.members || (namespaceSymbol.members = ts.createSymbolTable())) :
-                (namespaceSymbol.exports || (namespaceSymbol.exports = ts.createSymbolTable()));
-            var jsContainerFlag = isToplevelNamespaceableInitializer ? 67108864 : 0;
-            var isMethod = ts.isFunctionLikeDeclaration(ts.getAssignedJavascriptInitializer(propertyAccess));
-            var symbolFlags = (isMethod ? 8192 : 4) | jsContainerFlag;
-            var symbolExcludes = (isMethod ? 67208127 : 0) & ~jsContainerFlag;
-            declareSymbol(symbolTable, namespaceSymbol, propertyAccess, symbolFlags, symbolExcludes);
+            var args = [];
+            var pos = 0;
+            while (true) {
+                while (pos < text.length && text.charCodeAt(pos) <= 32 /* space */)
+                    pos++;
+                if (pos >= text.length)
+                    break;
+                var start = pos;
+                if (text.charCodeAt(start) === 34 /* doubleQuote */) {
+                    pos++;
+                    while (pos < text.length && text.charCodeAt(pos) !== 34 /* doubleQuote */)
+                        pos++;
+                    if (pos < text.length) {
+                        args.push(text.substring(start + 1, pos));
+                        pos++;
+                    }
+                    else {
+                        errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Unterminated_quoted_string_in_response_file_0, fileName));
+                    }
+                }
+                else {
+                    while (text.charCodeAt(pos) > 32 /* space */)
+                        pos++;
+                    args.push(text.substring(start, pos));
+                }
+            }
+            parseStrings(args);
         }
-        function isJavascriptContainer(symbol) {
-            if (symbol.flags & (16 | 32 | 1024)) {
-                return true;
+    }
+    ts.parseCommandLine = parseCommandLine;
+    /** @internal */
+    function getOptionFromName(optionName, allowShort) {
+        if (allowShort === void 0) { allowShort = false; }
+        optionName = optionName.toLowerCase();
+        var _a = getOptionNameMap(), optionNameMap = _a.optionNameMap, shortOptionNames = _a.shortOptionNames;
+        // Try to translate short option names to their full equivalents.
+        if (allowShort) {
+            var short = shortOptionNames.get(optionName);
+            if (short !== undefined) {
+                optionName = short;
             }
-            var node = symbol.valueDeclaration;
-            var init = !node ? undefined :
-                ts.isVariableDeclaration(node) ? node.initializer :
-                    ts.isBinaryExpression(node) ? node.right :
-                        ts.isPropertyAccessExpression(node) && ts.isBinaryExpression(node.parent) ? node.parent.right :
-                            undefined;
-            if (init) {
-                var isPrototypeAssignment = ts.isPrototypeAccess(ts.isVariableDeclaration(node) ? node.name : ts.isBinaryExpression(node) ? node.left : node);
-                return !!ts.getJavascriptInitializer(ts.isBinaryExpression(init) && init.operatorToken.kind === 54 ? init.right : init, isPrototypeAssignment);
+        }
+        return optionNameMap.get(optionName);
+    }
+    ts.getOptionFromName = getOptionFromName;
+    function getDiagnosticText(_message) {
+        var _args = [];
+        for (var _i = 1; _i < arguments.length; _i++) {
+            _args[_i - 1] = arguments[_i];
+        }
+        var diagnostic = ts.createCompilerDiagnostic.apply(undefined, arguments);
+        return diagnostic.messageText;
+    }
+    /* @internal */
+    function printVersion() {
+        ts.sys.write(getDiagnosticText(ts.Diagnostics.Version_0, ts.version) + ts.sys.newLine);
+    }
+    ts.printVersion = printVersion;
+    /* @internal */
+    function printHelp(optionsList, syntaxPrefix) {
+        if (syntaxPrefix === void 0) { syntaxPrefix = ""; }
+        var output = [];
+        // We want to align our "syntax" and "examples" commands to a certain margin.
+        var syntaxLength = getDiagnosticText(ts.Diagnostics.Syntax_Colon_0, "").length;
+        var examplesLength = getDiagnosticText(ts.Diagnostics.Examples_Colon_0, "").length;
+        var marginLength = Math.max(syntaxLength, examplesLength);
+        // Build up the syntactic skeleton.
+        var syntax = makePadding(marginLength - syntaxLength);
+        syntax += "tsc " + syntaxPrefix + "[" + getDiagnosticText(ts.Diagnostics.options) + "] [" + getDiagnosticText(ts.Diagnostics.file) + "...]";
+        output.push(getDiagnosticText(ts.Diagnostics.Syntax_Colon_0, syntax));
+        output.push(ts.sys.newLine + ts.sys.newLine);
+        // Build up the list of examples.
+        var padding = makePadding(marginLength);
+        output.push(getDiagnosticText(ts.Diagnostics.Examples_Colon_0, makePadding(marginLength - examplesLength) + "tsc hello.ts") + ts.sys.newLine);
+        output.push(padding + "tsc --outFile file.js file.ts" + ts.sys.newLine);
+        output.push(padding + "tsc @args.txt" + ts.sys.newLine);
+        output.push(padding + "tsc --build tsconfig.json" + ts.sys.newLine);
+        output.push(ts.sys.newLine);
+        output.push(getDiagnosticText(ts.Diagnostics.Options_Colon) + ts.sys.newLine);
+        // We want our descriptions to align at the same column in our output,
+        // so we keep track of the longest option usage string.
+        marginLength = 0;
+        var usageColumn = []; // Things like "-d, --declaration" go in here.
+        var descriptionColumn = [];
+        var optionsDescriptionMap = ts.createMap(); // Map between option.description and list of option.type if it is a kind
+        for (var _i = 0, optionsList_1 = optionsList; _i < optionsList_1.length; _i++) {
+            var option = optionsList_1[_i];
+            // If an option lacks a description,
+            // it is not officially supported.
+            if (!option.description) {
+                continue;
             }
+            var usageText_1 = " ";
+            if (option.shortName) {
+                usageText_1 += "-" + option.shortName;
+                usageText_1 += getParamType(option);
+                usageText_1 += ", ";
+            }
+            usageText_1 += "--" + option.name;
+            usageText_1 += getParamType(option);
+            usageColumn.push(usageText_1);
+            var description = void 0;
+            if (option.name === "lib") {
+                description = getDiagnosticText(option.description);
+                var element = option.element;
+                var typeMap = element.type;
+                optionsDescriptionMap.set(description, ts.arrayFrom(typeMap.keys()).map(function (key) { return "'" + key + "'"; }));
+            }
+            else {
+                description = getDiagnosticText(option.description);
+            }
+            descriptionColumn.push(description);
+            // Set the new margin for the description column if necessary.
+            marginLength = Math.max(usageText_1.length, marginLength);
+        }
+        // Special case that can't fit in the loop.
+        var usageText = " @<" + getDiagnosticText(ts.Diagnostics.file) + ">";
+        usageColumn.push(usageText);
+        descriptionColumn.push(getDiagnosticText(ts.Diagnostics.Insert_command_line_options_and_files_from_a_file));
+        marginLength = Math.max(usageText.length, marginLength);
+        // Print out each row, aligning all the descriptions on the same column.
+        for (var i = 0; i < usageColumn.length; i++) {
+            var usage = usageColumn[i];
+            var description = descriptionColumn[i];
+            var kindsList = optionsDescriptionMap.get(description);
+            output.push(usage + makePadding(marginLength - usage.length + 2) + description + ts.sys.newLine);
+            if (kindsList) {
+                output.push(makePadding(marginLength + 4));
+                for (var _a = 0, kindsList_1 = kindsList; _a < kindsList_1.length; _a++) {
+                    var kind = kindsList_1[_a];
+                    output.push(kind + " ");
+                }
+                output.push(ts.sys.newLine);
+            }
+        }
+        for (var _b = 0, output_1 = output; _b < output_1.length; _b++) {
+            var line = output_1[_b];
+            ts.sys.write(line);
+        }
+        return;
+        function getParamType(option) {
+            if (option.paramType !== undefined) {
+                return " " + getDiagnosticText(option.paramType);
+            }
+            return "";
+        }
+        function makePadding(paddingLength) {
+            return Array(paddingLength + 1).join(" ");
+        }
+    }
+    ts.printHelp = printHelp;
+    /**
+     * Reads the config file, reports errors if any and exits if the config file cannot be found
+     */
+    function getParsedCommandLineOfConfigFile(configFileName, optionsToExtend, host) {
+        var configFileText;
+        try {
+            configFileText = host.readFile(configFileName);
+        }
+        catch (e) {
+            var error = ts.createCompilerDiagnostic(ts.Diagnostics.Cannot_read_file_0_Colon_1, configFileName, e.message);
+            host.onUnRecoverableConfigFileDiagnostic(error);
+            return undefined;
+        }
+        if (!configFileText) {
+            var error = ts.createCompilerDiagnostic(ts.Diagnostics.File_0_not_found, configFileName);
+            host.onUnRecoverableConfigFileDiagnostic(error);
+            return undefined;
+        }
+        var result = ts.parseJsonText(configFileName, configFileText);
+        var cwd = host.getCurrentDirectory();
+        return parseJsonSourceFileConfigFileContent(result, host, ts.getNormalizedAbsolutePath(ts.getDirectoryPath(configFileName), cwd), optionsToExtend, ts.getNormalizedAbsolutePath(configFileName, cwd));
+    }
+    ts.getParsedCommandLineOfConfigFile = getParsedCommandLineOfConfigFile;
+    /**
+     * Read tsconfig.json file
+     * @param fileName The path to the config file
+     */
+    function readConfigFile(fileName, readFile) {
+        var textOrDiagnostic = tryReadFile(fileName, readFile);
+        return ts.isString(textOrDiagnostic) ? parseConfigFileTextToJson(fileName, textOrDiagnostic) : { config: {}, error: textOrDiagnostic };
+    }
+    ts.readConfigFile = readConfigFile;
+    /**
+     * Parse the text of the tsconfig.json file
+     * @param fileName The path to the config file
+     * @param jsonText The text of the config file
+     */
+    function parseConfigFileTextToJson(fileName, jsonText) {
+        var jsonSourceFile = ts.parseJsonText(fileName, jsonText);
+        return {
+            config: convertToObject(jsonSourceFile, jsonSourceFile.parseDiagnostics),
+            error: jsonSourceFile.parseDiagnostics.length ? jsonSourceFile.parseDiagnostics[0] : undefined
+        };
+    }
+    ts.parseConfigFileTextToJson = parseConfigFileTextToJson;
+    /**
+     * Read tsconfig.json file
+     * @param fileName The path to the config file
+     */
+    function readJsonConfigFile(fileName, readFile) {
+        var textOrDiagnostic = tryReadFile(fileName, readFile);
+        return ts.isString(textOrDiagnostic) ? ts.parseJsonText(fileName, textOrDiagnostic) : { parseDiagnostics: [textOrDiagnostic] };
+    }
+    ts.readJsonConfigFile = readJsonConfigFile;
+    function tryReadFile(fileName, readFile) {
+        var text;
+        try {
+            text = readFile(fileName);
+        }
+        catch (e) {
+            return ts.createCompilerDiagnostic(ts.Diagnostics.Cannot_read_file_0_Colon_1, fileName, e.message);
+        }
+        return text === undefined ? ts.createCompilerDiagnostic(ts.Diagnostics.The_specified_path_does_not_exist_Colon_0, fileName) : text;
+    }
+    function commandLineOptionsToMap(options) {
+        return ts.arrayToMap(options, function (option) { return option.name; });
+    }
+    var _tsconfigRootOptions;
+    function getTsconfigRootOptionsMap() {
+        if (_tsconfigRootOptions === undefined) {
+            _tsconfigRootOptions = {
+                name: undefined,
+                type: "object",
+                elementOptions: commandLineOptionsToMap([
+                    {
+                        name: "compilerOptions",
+                        type: "object",
+                        elementOptions: commandLineOptionsToMap(ts.optionDeclarations),
+                        extraKeyDiagnosticMessage: ts.Diagnostics.Unknown_compiler_option_0
+                    },
+                    {
+                        name: "typingOptions",
+                        type: "object",
+                        elementOptions: commandLineOptionsToMap(ts.typeAcquisitionDeclarations),
+                        extraKeyDiagnosticMessage: ts.Diagnostics.Unknown_type_acquisition_option_0
+                    },
+                    {
+                        name: "typeAcquisition",
+                        type: "object",
+                        elementOptions: commandLineOptionsToMap(ts.typeAcquisitionDeclarations),
+                        extraKeyDiagnosticMessage: ts.Diagnostics.Unknown_type_acquisition_option_0
+                    },
+                    {
+                        name: "extends",
+                        type: "string"
+                    },
+                    {
+                        name: "references",
+                        type: "list",
+                        element: {
+                            name: "references",
+                            type: "object"
+                        }
+                    },
+                    {
+                        name: "files",
+                        type: "list",
+                        element: {
+                            name: "files",
+                            type: "string"
+                        }
+                    },
+                    {
+                        name: "include",
+                        type: "list",
+                        element: {
+                            name: "include",
+                            type: "string"
+                        }
+                    },
+                    {
+                        name: "exclude",
+                        type: "list",
+                        element: {
+                            name: "exclude",
+                            type: "string"
+                        }
+                    },
+                    ts.compileOnSaveCommandLineOption
+                ])
+            };
+        }
+        return _tsconfigRootOptions;
+    }
+    /**
+     * Convert the json syntax tree into the json value
+     */
+    function convertToObject(sourceFile, errors) {
+        return convertToObjectWorker(sourceFile, errors, /*returnValue*/ true, /*knownRootOptions*/ undefined, /*jsonConversionNotifier*/ undefined);
+    }
+    ts.convertToObject = convertToObject;
+    /**
+     * Convert the json syntax tree into the json value and report errors
+     * This returns the json value (apart from checking errors) only if returnValue provided is true.
+     * Otherwise it just checks the errors and returns undefined
+     */
+    /*@internal*/
+    function convertToObjectWorker(sourceFile, errors, returnValue, knownRootOptions, jsonConversionNotifier) {
+        if (!sourceFile.statements.length) {
+            return returnValue ? {} : undefined;
+        }
+        return convertPropertyValueToJson(sourceFile.statements[0].expression, knownRootOptions);
+        function isRootOptionMap(knownOptions) {
+            return knownRootOptions && knownRootOptions.elementOptions === knownOptions;
+        }
+        function convertObjectLiteralExpressionToJson(node, knownOptions, extraKeyDiagnosticMessage, parentOption) {
+            var result = returnValue ? {} : undefined;
+            for (var _i = 0, _a = node.properties; _i < _a.length; _i++) {
+                var element = _a[_i];
+                if (element.kind !== 270 /* PropertyAssignment */) {
+                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, element, ts.Diagnostics.Property_assignment_expected));
+                    continue;
+                }
+                if (element.questionToken) {
+                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, element.questionToken, ts.Diagnostics._0_can_only_be_used_in_a_ts_file, "?"));
+                }
+                if (!isDoubleQuotedString(element.name)) {
+                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, element.name, ts.Diagnostics.String_literal_with_double_quotes_expected));
+                }
+                var keyText = ts.unescapeLeadingUnderscores(ts.getTextOfPropertyName(element.name));
+                var option = knownOptions ? knownOptions.get(keyText) : undefined;
+                if (extraKeyDiagnosticMessage && !option) {
+                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, element.name, extraKeyDiagnosticMessage, keyText));
+                }
+                var value = convertPropertyValueToJson(element.initializer, option);
+                if (typeof keyText !== "undefined") {
+                    if (returnValue) {
+                        result[keyText] = value;
+                    }
+                    // Notify key value set, if user asked for it
+                    if (jsonConversionNotifier &&
+                        // Current callbacks are only on known parent option or if we are setting values in the root
+                        (parentOption || isRootOptionMap(knownOptions))) {
+                        var isValidOptionValue = isCompilerOptionsValue(option, value);
+                        if (parentOption) {
+                            if (isValidOptionValue) {
+                                // Notify option set in the parent if its a valid option value
+                                jsonConversionNotifier.onSetValidOptionKeyValueInParent(parentOption, option, value);
+                            }
+                        }
+                        else if (isRootOptionMap(knownOptions)) {
+                            if (isValidOptionValue) {
+                                // Notify about the valid root key value being set
+                                jsonConversionNotifier.onSetValidOptionKeyValueInRoot(keyText, element.name, value, element.initializer);
+                            }
+                            else if (!option) {
+                                // Notify about the unknown root key value being set
+                                jsonConversionNotifier.onSetUnknownOptionKeyValueInRoot(keyText, element.name, value, element.initializer);
+                            }
+                        }
+                    }
+                }
+            }
+            return result;
+        }
+        function convertArrayLiteralExpressionToJson(elements, elementOption) {
+            return (returnValue ? elements.map : elements.forEach).call(elements, function (element) { return convertPropertyValueToJson(element, elementOption); });
+        }
+        function convertPropertyValueToJson(valueExpression, option) {
+            switch (valueExpression.kind) {
+                case 101 /* TrueKeyword */:
+                    reportInvalidOptionValue(option && option.type !== "boolean");
+                    return true;
+                case 86 /* FalseKeyword */:
+                    reportInvalidOptionValue(option && option.type !== "boolean");
+                    return false;
+                case 95 /* NullKeyword */:
+                    reportInvalidOptionValue(option && option.name === "extends"); // "extends" is the only option we don't allow null/undefined for
+                    return null; // tslint:disable-line:no-null-keyword
+                case 9 /* StringLiteral */:
+                    if (!isDoubleQuotedString(valueExpression)) {
+                        errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, valueExpression, ts.Diagnostics.String_literal_with_double_quotes_expected));
+                    }
+                    reportInvalidOptionValue(option && (ts.isString(option.type) && option.type !== "string"));
+                    var text = valueExpression.text;
+                    if (option && !ts.isString(option.type)) {
+                        var customOption = option;
+                        // Validate custom option type
+                        if (!customOption.type.has(text.toLowerCase())) {
+                            errors.push(createDiagnosticForInvalidCustomType(customOption, function (message, arg0, arg1) { return ts.createDiagnosticForNodeInSourceFile(sourceFile, valueExpression, message, arg0, arg1); }));
+                        }
+                    }
+                    return text;
+                case 8 /* NumericLiteral */:
+                    reportInvalidOptionValue(option && option.type !== "number");
+                    return Number(valueExpression.text);
+                case 198 /* PrefixUnaryExpression */:
+                    if (valueExpression.operator !== 38 /* MinusToken */ || valueExpression.operand.kind !== 8 /* NumericLiteral */) {
+                        break; // not valid JSON syntax
+                    }
+                    reportInvalidOptionValue(option && option.type !== "number");
+                    return -Number(valueExpression.operand.text);
+                case 184 /* ObjectLiteralExpression */:
+                    reportInvalidOptionValue(option && option.type !== "object");
+                    var objectLiteralExpression = valueExpression;
+                    // Currently having element option declaration in the tsconfig with type "object"
+                    // determines if it needs onSetValidOptionKeyValueInParent callback or not
+                    // At moment there are only "compilerOptions", "typeAcquisition" and "typingOptions"
+                    // that satifies it and need it to modify options set in them (for normalizing file paths)
+                    // vs what we set in the json
+                    // If need arises, we can modify this interface and callbacks as needed
+                    if (option) {
+                        var _a = option, elementOptions = _a.elementOptions, extraKeyDiagnosticMessage = _a.extraKeyDiagnosticMessage, optionName = _a.name;
+                        return convertObjectLiteralExpressionToJson(objectLiteralExpression, elementOptions, extraKeyDiagnosticMessage, optionName);
+                    }
+                    else {
+                        return convertObjectLiteralExpressionToJson(objectLiteralExpression, /* knownOptions*/ undefined, 
+                        /*extraKeyDiagnosticMessage */ undefined, /*parentOption*/ undefined);
+                    }
+                case 183 /* ArrayLiteralExpression */:
+                    reportInvalidOptionValue(option && option.type !== "list");
+                    return convertArrayLiteralExpressionToJson(valueExpression.elements, option && option.element);
+            }
+            // Not in expected format
+            if (option) {
+                reportInvalidOptionValue(/*isError*/ true);
+            }
+            else {
+                errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, valueExpression, ts.Diagnostics.Property_value_can_only_be_string_literal_numeric_literal_true_false_null_object_literal_or_array_literal));
+            }
+            return undefined;
+            function reportInvalidOptionValue(isError) {
+                if (isError) {
+                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, valueExpression, ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, option.name, getCompilerOptionValueTypeString(option)));
+                }
+            }
+        }
+        function isDoubleQuotedString(node) {
+            return ts.isStringLiteral(node) && ts.isStringDoubleQuoted(node, sourceFile);
+        }
+    }
+    ts.convertToObjectWorker = convertToObjectWorker;
+    function getCompilerOptionValueTypeString(option) {
+        return option.type === "list" ?
+            "Array" :
+            ts.isString(option.type) ? option.type : "string";
+    }
+    function isCompilerOptionsValue(option, value) {
+        if (option) {
+            if (isNullOrUndefined(value))
+                return true; // All options are undefinable/nullable
+            if (option.type === "list") {
+                return ts.isArray(value);
+            }
+            var expectedType = ts.isString(option.type) ? option.type : "string";
+            return typeof value === expectedType;
+        }
+        return false;
+    }
+    /**
+     * Generate tsconfig configuration when running command line "--init"
+     * @param options commandlineOptions to be generated into tsconfig.json
+     * @param fileNames array of filenames to be generated into tsconfig.json
+     */
+    /* @internal */
+    function generateTSConfig(options, fileNames, newLine) {
+        var compilerOptions = ts.extend(options, ts.defaultInitCompilerOptions);
+        var compilerOptionsMap = serializeCompilerOptions(compilerOptions);
+        return writeConfigurations();
+        function getCustomTypeMapOfCommandLineOption(optionDefinition) {
+            if (optionDefinition.type === "string" || optionDefinition.type === "number" || optionDefinition.type === "boolean") {
+                // this is of a type CommandLineOptionOfPrimitiveType
+                return undefined;
+            }
+            else if (optionDefinition.type === "list") {
+                return getCustomTypeMapOfCommandLineOption(optionDefinition.element);
+            }
+            else {
+                return optionDefinition.type;
+            }
+        }
+        function getNameOfCompilerOptionValue(value, customTypeMap) {
+            // There is a typeMap associated with this command-line option so use it to map value back to its name
+            return ts.forEachEntry(customTypeMap, function (mapValue, key) {
+                if (mapValue === value) {
+                    return key;
+                }
+            });
+        }
+        function serializeCompilerOptions(options) {
+            var result = ts.createMap();
+            var optionsNameMap = getOptionNameMap().optionNameMap;
+            var _loop_3 = function (name) {
+                if (ts.hasProperty(options, name)) {
+                    // tsconfig only options cannot be specified via command line,
+                    // so we can assume that only types that can appear here string | number | boolean
+                    if (optionsNameMap.has(name) && optionsNameMap.get(name).category === ts.Diagnostics.Command_line_Options) {
+                        return "continue";
+                    }
+                    var value = options[name];
+                    var optionDefinition = optionsNameMap.get(name.toLowerCase());
+                    if (optionDefinition) {
+                        var customTypeMap_1 = getCustomTypeMapOfCommandLineOption(optionDefinition);
+                        if (!customTypeMap_1) {
+                            // There is no map associated with this compiler option then use the value as-is
+                            // This is the case if the value is expect to be string, number, boolean or list of string
+                            result.set(name, value);
+                        }
+                        else {
+                            if (optionDefinition.type === "list") {
+                                result.set(name, value.map(function (element) { return getNameOfCompilerOptionValue(element, customTypeMap_1); })); // TODO: GH#18217
+                            }
+                            else {
+                                // There is a typeMap associated with this command-line option so use it to map value back to its name
+                                result.set(name, getNameOfCompilerOptionValue(value, customTypeMap_1));
+                            }
+                        }
+                    }
+                }
+            };
+            for (var name in options) {
+                _loop_3(name);
+            }
+            return result;
+        }
+        function getDefaultValueForOption(option) {
+            switch (option.type) {
+                case "number":
+                    return 1;
+                case "boolean":
+                    return true;
+                case "string":
+                    return option.isFilePath ? "./" : "";
+                case "list":
+                    return [];
+                case "object":
+                    return {};
+                default:
+                    return option.type.keys().next().value;
+            }
+        }
+        function makePadding(paddingLength) {
+            return Array(paddingLength + 1).join(" ");
+        }
+        function isAllowedOption(_a) {
+            var category = _a.category, name = _a.name;
+            // Skip options which do not have a category or have category `Command_line_Options`
+            // Exclude all possible `Advanced_Options` in tsconfig.json which were NOT defined in command line
+            return category !== undefined
+                && category !== ts.Diagnostics.Command_line_Options
+                && (category !== ts.Diagnostics.Advanced_Options || compilerOptionsMap.has(name));
+        }
+        function writeConfigurations() {
+            // Filter applicable options to place in the file
+            var categorizedOptions = ts.createMultiMap();
+            for (var _i = 0, optionDeclarations_1 = ts.optionDeclarations; _i < optionDeclarations_1.length; _i++) {
+                var option = optionDeclarations_1[_i];
+                var category = option.category;
+                if (isAllowedOption(option)) {
+                    categorizedOptions.add(ts.getLocaleSpecificMessage(category), option);
+                }
+            }
+            // Serialize all options and their descriptions
+            var marginLength = 0;
+            var seenKnownKeys = 0;
+            var nameColumn = [];
+            var descriptionColumn = [];
+            categorizedOptions.forEach(function (options, category) {
+                if (nameColumn.length !== 0) {
+                    nameColumn.push("");
+                    descriptionColumn.push("");
+                }
+                nameColumn.push("/* " + category + " */");
+                descriptionColumn.push("");
+                for (var _i = 0, options_1 = options; _i < options_1.length; _i++) {
+                    var option = options_1[_i];
+                    var optionName = void 0;
+                    if (compilerOptionsMap.has(option.name)) {
+                        optionName = "\"" + option.name + "\": " + JSON.stringify(compilerOptionsMap.get(option.name)) + ((seenKnownKeys += 1) === compilerOptionsMap.size ? "" : ",");
+                    }
+                    else {
+                        optionName = "// \"" + option.name + "\": " + JSON.stringify(getDefaultValueForOption(option)) + ",";
+                    }
+                    nameColumn.push(optionName);
+                    descriptionColumn.push("/* " + (option.description && ts.getLocaleSpecificMessage(option.description) || option.name) + " */");
+                    marginLength = Math.max(optionName.length, marginLength);
+                }
+            });
+            // Write the output
+            var tab = makePadding(2);
+            var result = [];
+            result.push("{");
+            result.push(tab + "\"compilerOptions\": {");
+            // Print out each row, aligning all the descriptions on the same column.
+            for (var i = 0; i < nameColumn.length; i++) {
+                var optionName = nameColumn[i];
+                var description = descriptionColumn[i];
+                result.push(optionName && "" + tab + tab + optionName + (description && (makePadding(marginLength - optionName.length + 2) + description)));
+            }
+            if (fileNames.length) {
+                result.push(tab + "},");
+                result.push(tab + "\"files\": [");
+                for (var i = 0; i < fileNames.length; i++) {
+                    result.push("" + tab + tab + JSON.stringify(fileNames[i]) + (i === fileNames.length - 1 ? "" : ","));
+                }
+                result.push(tab + "]");
+            }
+            else {
+                result.push(tab + "}");
+            }
+            result.push("}");
+            return result.join(newLine);
+        }
+    }
+    ts.generateTSConfig = generateTSConfig;
+    /**
+     * Parse the contents of a config file (tsconfig.json).
+     * @param json The contents of the config file to parse
+     * @param host Instance of ParseConfigHost used to enumerate files in folder.
+     * @param basePath A root directory to resolve relative path entries in the config
+     *    file to. e.g. outDir
+     */
+    function parseJsonConfigFileContent(json, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions) {
+        return parseJsonConfigFileContentWorker(json, /*sourceFile*/ undefined, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions);
+    }
+    ts.parseJsonConfigFileContent = parseJsonConfigFileContent;
+    /**
+     * Parse the contents of a config file (tsconfig.json).
+     * @param jsonNode The contents of the config file to parse
+     * @param host Instance of ParseConfigHost used to enumerate files in folder.
+     * @param basePath A root directory to resolve relative path entries in the config
+     *    file to. e.g. outDir
+     */
+    function parseJsonSourceFileConfigFileContent(sourceFile, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions) {
+        return parseJsonConfigFileContentWorker(/*json*/ undefined, sourceFile, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions);
+    }
+    ts.parseJsonSourceFileConfigFileContent = parseJsonSourceFileConfigFileContent;
+    /*@internal*/
+    function setConfigFileInOptions(options, configFile) {
+        if (configFile) {
+            Object.defineProperty(options, "configFile", { enumerable: false, writable: false, value: configFile });
+        }
+    }
+    ts.setConfigFileInOptions = setConfigFileInOptions;
+    function isNullOrUndefined(x) {
+        // tslint:disable-next-line:no-null-keyword
+        return x === undefined || x === null;
+    }
+    function directoryOfCombinedPath(fileName, basePath) {
+        // Use the `getNormalizedAbsolutePath` function to avoid canonicalizing the path, as it must remain noncanonical
+        // until consistient casing errors are reported
+        return ts.getDirectoryPath(ts.getNormalizedAbsolutePath(fileName, basePath));
+    }
+    /**
+     * Parse the contents of a config file from json or json source file (tsconfig.json).
+     * @param json The contents of the config file to parse
+     * @param sourceFile sourceFile corresponding to the Json
+     * @param host Instance of ParseConfigHost used to enumerate files in folder.
+     * @param basePath A root directory to resolve relative path entries in the config
+     *    file to. e.g. outDir
+     * @param resolutionStack Only present for backwards-compatibility. Should be empty.
+     */
+    function parseJsonConfigFileContentWorker(json, sourceFile, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions) {
+        if (existingOptions === void 0) { existingOptions = {}; }
+        if (resolutionStack === void 0) { resolutionStack = []; }
+        if (extraFileExtensions === void 0) { extraFileExtensions = []; }
+        ts.Debug.assert((json === undefined && sourceFile !== undefined) || (json !== undefined && sourceFile === undefined));
+        var errors = [];
+        var parsedConfig = parseConfig(json, sourceFile, host, basePath, configFileName, resolutionStack, errors);
+        var raw = parsedConfig.raw;
+        var options = ts.extend(existingOptions, parsedConfig.options || {});
+        options.configFilePath = configFileName && ts.normalizeSlashes(configFileName);
+        setConfigFileInOptions(options, sourceFile);
+        var _a = getFileNames(), fileNames = _a.fileNames, wildcardDirectories = _a.wildcardDirectories, spec = _a.spec, projectReferences = _a.projectReferences;
+        return {
+            options: options,
+            fileNames: fileNames,
+            projectReferences: projectReferences,
+            typeAcquisition: parsedConfig.typeAcquisition || getDefaultTypeAcquisition(),
+            raw: raw,
+            errors: errors,
+            wildcardDirectories: wildcardDirectories,
+            compileOnSave: !!raw.compileOnSave,
+            configFileSpecs: spec
+        };
+        function getFileNames() {
+            var filesSpecs;
+            if (ts.hasProperty(raw, "files") && !isNullOrUndefined(raw.files)) {
+                if (ts.isArray(raw.files)) {
+                    filesSpecs = raw.files;
+                    if (filesSpecs.length === 0) {
+                        createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.The_files_list_in_config_file_0_is_empty, configFileName || "tsconfig.json");
+                    }
+                }
+                else {
+                    createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "files", "Array");
+                }
+            }
+            var includeSpecs;
+            if (ts.hasProperty(raw, "include") && !isNullOrUndefined(raw.include)) {
+                if (ts.isArray(raw.include)) {
+                    includeSpecs = raw.include;
+                }
+                else {
+                    createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "include", "Array");
+                }
+            }
+            var excludeSpecs;
+            if (ts.hasProperty(raw, "exclude") && !isNullOrUndefined(raw.exclude)) {
+                if (ts.isArray(raw.exclude)) {
+                    excludeSpecs = raw.exclude;
+                }
+                else {
+                    createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "exclude", "Array");
+                }
+            }
+            else if (raw.compilerOptions) {
+                var outDir = raw.compilerOptions.outDir;
+                var declarationDir = raw.compilerOptions.declarationDir;
+                if (outDir || declarationDir) {
+                    excludeSpecs = [outDir, declarationDir].filter(function (d) { return !!d; });
+                }
+            }
+            if (filesSpecs === undefined && includeSpecs === undefined) {
+                includeSpecs = ["**/*"];
+            }
+            var result = matchFileNames(filesSpecs, includeSpecs, excludeSpecs, configFileName ? directoryOfCombinedPath(configFileName, basePath) : basePath, options, host, errors, extraFileExtensions, sourceFile);
+            if (result.fileNames.length === 0 && !ts.hasProperty(raw, "files") && resolutionStack.length === 0 && !ts.hasProperty(raw, "references")) {
+                errors.push(getErrorForNoInputFiles(result.spec, configFileName));
+            }
+            if (ts.hasProperty(raw, "references") && !isNullOrUndefined(raw.references)) {
+                if (ts.isArray(raw.references)) {
+                    var references = [];
+                    for (var _i = 0, _a = raw.references; _i < _a.length; _i++) {
+                        var ref = _a[_i];
+                        if (typeof ref.path !== "string") {
+                            createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "reference.path", "string");
+                        }
+                        else {
+                            references.push({
+                                path: ts.getNormalizedAbsolutePath(ref.path, basePath),
+                                originalPath: ref.path,
+                                prepend: ref.prepend,
+                                circular: ref.circular
+                            });
+                        }
+                    }
+                    result.projectReferences = references;
+                }
+                else {
+                    createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "references", "Array");
+                }
+            }
+            return result;
+        }
+        function createCompilerDiagnosticOnlyIfJson(message, arg0, arg1) {
+            if (!sourceFile) {
+                errors.push(ts.createCompilerDiagnostic(message, arg0, arg1));
+            }
+        }
+    }
+    /*@internal*/
+    function isErrorNoInputFiles(error) {
+        return error.code === ts.Diagnostics.No_inputs_were_found_in_config_file_0_Specified_include_paths_were_1_and_exclude_paths_were_2.code;
+    }
+    ts.isErrorNoInputFiles = isErrorNoInputFiles;
+    /*@internal*/
+    function getErrorForNoInputFiles(_a, configFileName) {
+        var includeSpecs = _a.includeSpecs, excludeSpecs = _a.excludeSpecs;
+        return ts.createCompilerDiagnostic(ts.Diagnostics.No_inputs_were_found_in_config_file_0_Specified_include_paths_were_1_and_exclude_paths_were_2, configFileName || "tsconfig.json", JSON.stringify(includeSpecs || []), JSON.stringify(excludeSpecs || []));
+    }
+    ts.getErrorForNoInputFiles = getErrorForNoInputFiles;
+    function isSuccessfulParsedTsconfig(value) {
+        return !!value.options;
+    }
+    /**
+     * This *just* extracts options/include/exclude/files out of a config file.
+     * It does *not* resolve the included files.
+     */
+    function parseConfig(json, sourceFile, host, basePath, configFileName, resolutionStack, errors) {
+        basePath = ts.normalizeSlashes(basePath);
+        var resolvedPath = ts.getNormalizedAbsolutePath(configFileName || "", basePath);
+        if (resolutionStack.indexOf(resolvedPath) >= 0) {
+            errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Circularity_detected_while_resolving_configuration_Colon_0, resolutionStack.concat([resolvedPath]).join(" -> ")));
+            return { raw: json || convertToObject(sourceFile, errors) };
+        }
+        var ownConfig = json ?
+            parseOwnConfigOfJson(json, host, basePath, configFileName, errors) :
+            parseOwnConfigOfJsonSourceFile(sourceFile, host, basePath, configFileName, errors);
+        if (ownConfig.extendedConfigPath) {
+            // copy the resolution stack so it is never reused between branches in potential diamond-problem scenarios.
+            resolutionStack = resolutionStack.concat([resolvedPath]);
+            var extendedConfig = getExtendedConfig(sourceFile, ownConfig.extendedConfigPath, host, basePath, resolutionStack, errors);
+            if (extendedConfig && isSuccessfulParsedTsconfig(extendedConfig)) {
+                var baseRaw_1 = extendedConfig.raw;
+                var raw_1 = ownConfig.raw;
+                var setPropertyInRawIfNotUndefined = function (propertyName) {
+                    var value = raw_1[propertyName] || baseRaw_1[propertyName];
+                    if (value) {
+                        raw_1[propertyName] = value;
+                    }
+                };
+                setPropertyInRawIfNotUndefined("include");
+                setPropertyInRawIfNotUndefined("exclude");
+                setPropertyInRawIfNotUndefined("files");
+                if (raw_1.compileOnSave === undefined) {
+                    raw_1.compileOnSave = baseRaw_1.compileOnSave;
+                }
+                ownConfig.options = ts.assign({}, extendedConfig.options, ownConfig.options);
+                // TODO extend type typeAcquisition
+            }
+        }
+        return ownConfig;
+    }
+    function parseOwnConfigOfJson(json, host, basePath, configFileName, errors) {
+        if (ts.hasProperty(json, "excludes")) {
+            errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Unknown_option_excludes_Did_you_mean_exclude));
+        }
+        var options = convertCompilerOptionsFromJsonWorker(json.compilerOptions, basePath, errors, configFileName);
+        // typingOptions has been deprecated and is only supported for backward compatibility purposes.
+        // It should be removed in future releases - use typeAcquisition instead.
+        var typeAcquisition = convertTypeAcquisitionFromJsonWorker(json.typeAcquisition || json.typingOptions, basePath, errors, configFileName);
+        json.compileOnSave = convertCompileOnSaveOptionFromJson(json, basePath, errors);
+        var extendedConfigPath;
+        if (json.extends) {
+            if (!ts.isString(json.extends)) {
+                errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "extends", "string"));
+            }
+            else {
+                var newBase = configFileName ? directoryOfCombinedPath(configFileName, basePath) : basePath;
+                extendedConfigPath = getExtendsConfigPath(json.extends, host, newBase, errors, ts.createCompilerDiagnostic);
+            }
+        }
+        return { raw: json, options: options, typeAcquisition: typeAcquisition, extendedConfigPath: extendedConfigPath };
+    }
+    function parseOwnConfigOfJsonSourceFile(sourceFile, host, basePath, configFileName, errors) {
+        var options = getDefaultCompilerOptions(configFileName);
+        var typeAcquisition, typingOptionstypeAcquisition;
+        var extendedConfigPath;
+        var optionsIterator = {
+            onSetValidOptionKeyValueInParent: function (parentOption, option, value) {
+                ts.Debug.assert(parentOption === "compilerOptions" || parentOption === "typeAcquisition" || parentOption === "typingOptions");
+                var currentOption = parentOption === "compilerOptions" ?
+                    options :
+                    parentOption === "typeAcquisition" ?
+                        (typeAcquisition || (typeAcquisition = getDefaultTypeAcquisition(configFileName))) :
+                        (typingOptionstypeAcquisition || (typingOptionstypeAcquisition = getDefaultTypeAcquisition(configFileName)));
+                currentOption[option.name] = normalizeOptionValue(option, basePath, value);
+            },
+            onSetValidOptionKeyValueInRoot: function (key, _keyNode, value, valueNode) {
+                switch (key) {
+                    case "extends":
+                        var newBase = configFileName ? directoryOfCombinedPath(configFileName, basePath) : basePath;
+                        extendedConfigPath = getExtendsConfigPath(value, host, newBase, errors, function (message, arg0) {
+                            return ts.createDiagnosticForNodeInSourceFile(sourceFile, valueNode, message, arg0);
+                        });
+                        return;
+                    case "files":
+                        if (value.length === 0) {
+                            errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, valueNode, ts.Diagnostics.The_files_list_in_config_file_0_is_empty, configFileName || "tsconfig.json"));
+                        }
+                        return;
+                }
+            },
+            onSetUnknownOptionKeyValueInRoot: function (key, keyNode, _value, _valueNode) {
+                if (key === "excludes") {
+                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, keyNode, ts.Diagnostics.Unknown_option_excludes_Did_you_mean_exclude));
+                }
+            }
+        };
+        var json = convertToObjectWorker(sourceFile, errors, /*returnValue*/ true, getTsconfigRootOptionsMap(), optionsIterator);
+        if (!typeAcquisition) {
+            if (typingOptionstypeAcquisition) {
+                typeAcquisition = (typingOptionstypeAcquisition.enableAutoDiscovery !== undefined) ?
+                    {
+                        enable: typingOptionstypeAcquisition.enableAutoDiscovery,
+                        include: typingOptionstypeAcquisition.include,
+                        exclude: typingOptionstypeAcquisition.exclude
+                    } :
+                    typingOptionstypeAcquisition;
+            }
+            else {
+                typeAcquisition = getDefaultTypeAcquisition(configFileName);
+            }
+        }
+        return { raw: json, options: options, typeAcquisition: typeAcquisition, extendedConfigPath: extendedConfigPath };
+    }
+    function getExtendsConfigPath(extendedConfig, host, basePath, errors, createDiagnostic) {
+        extendedConfig = ts.normalizeSlashes(extendedConfig);
+        // If the path isn't a rooted or relative path, don't try to resolve it (we reserve the right to special case module-id like paths in the future)
+        if (!(ts.isRootedDiskPath(extendedConfig) || ts.startsWith(extendedConfig, "./") || ts.startsWith(extendedConfig, "../"))) {
+            errors.push(createDiagnostic(ts.Diagnostics.A_path_in_an_extends_option_must_be_relative_or_rooted_but_0_is_not, extendedConfig));
+            return undefined;
+        }
+        var extendedConfigPath = ts.getNormalizedAbsolutePath(extendedConfig, basePath);
+        if (!host.fileExists(extendedConfigPath) && !ts.endsWith(extendedConfigPath, ".json" /* Json */)) {
+            extendedConfigPath = extendedConfigPath + ".json";
+            if (!host.fileExists(extendedConfigPath)) {
+                errors.push(createDiagnostic(ts.Diagnostics.File_0_does_not_exist, extendedConfig));
+                return undefined;
+            }
+        }
+        return extendedConfigPath;
+    }
+    function getExtendedConfig(sourceFile, extendedConfigPath, host, basePath, resolutionStack, errors) {
+        var _a;
+        var extendedResult = readJsonConfigFile(extendedConfigPath, function (path) { return host.readFile(path); });
+        if (sourceFile) {
+            (sourceFile.extendedSourceFiles || (sourceFile.extendedSourceFiles = [])).push(extendedResult.fileName);
+        }
+        if (extendedResult.parseDiagnostics.length) {
+            errors.push.apply(errors, extendedResult.parseDiagnostics);
+            return undefined;
+        }
+        var extendedDirname = ts.getDirectoryPath(extendedConfigPath);
+        var extendedConfig = parseConfig(/*json*/ undefined, extendedResult, host, extendedDirname, ts.getBaseFileName(extendedConfigPath), resolutionStack, errors);
+        if (sourceFile) {
+            (_a = sourceFile.extendedSourceFiles).push.apply(_a, extendedResult.extendedSourceFiles);
+        }
+        if (isSuccessfulParsedTsconfig(extendedConfig)) {
+            // Update the paths to reflect base path
+            var relativeDifference_1 = ts.convertToRelativePath(extendedDirname, basePath, ts.identity);
+            var updatePath_1 = function (path) { return ts.isRootedDiskPath(path) ? path : ts.combinePaths(relativeDifference_1, path); };
+            var mapPropertiesInRawIfNotUndefined = function (propertyName) {
+                if (raw_2[propertyName]) {
+                    raw_2[propertyName] = ts.map(raw_2[propertyName], updatePath_1);
+                }
+            };
+            var raw_2 = extendedConfig.raw;
+            mapPropertiesInRawIfNotUndefined("include");
+            mapPropertiesInRawIfNotUndefined("exclude");
+            mapPropertiesInRawIfNotUndefined("files");
+        }
+        return extendedConfig;
+    }
+    function convertCompileOnSaveOptionFromJson(jsonOption, basePath, errors) {
+        if (!ts.hasProperty(jsonOption, ts.compileOnSaveCommandLineOption.name)) {
             return false;
         }
-        function getParentOfBinaryExpression(expr) {
-            while (ts.isBinaryExpression(expr.parent)) {
-                expr = expr.parent;
-            }
-            return expr.parent;
+        var result = convertJsonOption(ts.compileOnSaveCommandLineOption, jsonOption.compileOnSave, basePath, errors);
+        return typeof result === "boolean" && result;
+    }
+    function convertCompilerOptionsFromJson(jsonOptions, basePath, configFileName) {
+        var errors = [];
+        var options = convertCompilerOptionsFromJsonWorker(jsonOptions, basePath, errors, configFileName);
+        return { options: options, errors: errors };
+    }
+    ts.convertCompilerOptionsFromJson = convertCompilerOptionsFromJson;
+    function convertTypeAcquisitionFromJson(jsonOptions, basePath, configFileName) {
+        var errors = [];
+        var options = convertTypeAcquisitionFromJsonWorker(jsonOptions, basePath, errors, configFileName);
+        return { options: options, errors: errors };
+    }
+    ts.convertTypeAcquisitionFromJson = convertTypeAcquisitionFromJson;
+    function getDefaultCompilerOptions(configFileName) {
+        var options = configFileName && ts.getBaseFileName(configFileName) === "jsconfig.json"
+            ? { allowJs: true, maxNodeModuleJsDepth: 2, allowSyntheticDefaultImports: true, skipLibCheck: true, noEmit: true }
+            : {};
+        return options;
+    }
+    function convertCompilerOptionsFromJsonWorker(jsonOptions, basePath, errors, configFileName) {
+        var options = getDefaultCompilerOptions(configFileName);
+        convertOptionsFromJson(ts.optionDeclarations, jsonOptions, basePath, options, ts.Diagnostics.Unknown_compiler_option_0, errors);
+        if (configFileName) {
+            options.configFilePath = ts.normalizeSlashes(configFileName);
         }
-        function lookupSymbolForPropertyAccess(node, lookupContainer) {
-            if (lookupContainer === void 0) { lookupContainer = container; }
-            if (ts.isIdentifier(node)) {
-                return lookupSymbolForNameWorker(lookupContainer, node.escapedText);
+        return options;
+    }
+    function getDefaultTypeAcquisition(configFileName) {
+        return { enable: !!configFileName && ts.getBaseFileName(configFileName) === "jsconfig.json", include: [], exclude: [] };
+    }
+    function convertTypeAcquisitionFromJsonWorker(jsonOptions, basePath, errors, configFileName) {
+        var options = getDefaultTypeAcquisition(configFileName);
+        var typeAcquisition = convertEnableAutoDiscoveryToEnable(jsonOptions);
+        convertOptionsFromJson(ts.typeAcquisitionDeclarations, typeAcquisition, basePath, options, ts.Diagnostics.Unknown_type_acquisition_option_0, errors);
+        return options;
+    }
+    function convertOptionsFromJson(optionDeclarations, jsonOptions, basePath, defaultOptions, diagnosticMessage, errors) {
+        if (!jsonOptions) {
+            return;
+        }
+        var optionNameMap = commandLineOptionsToMap(optionDeclarations);
+        for (var id in jsonOptions) {
+            var opt = optionNameMap.get(id);
+            if (opt) {
+                defaultOptions[opt.name] = convertJsonOption(opt, jsonOptions[id], basePath, errors);
             }
             else {
-                var symbol = lookupSymbolForPropertyAccess(node.expression);
-                return symbol && symbol.exports && symbol.exports.get(node.name.escapedText);
+                errors.push(ts.createCompilerDiagnostic(diagnosticMessage, id));
             }
         }
-        function forEachIdentifierInEntityName(e, parent, action) {
-            if (isExportsOrModuleExportsOrAlias(file, e)) {
-                return file.symbol;
+    }
+    function convertJsonOption(opt, value, basePath, errors) {
+        if (isCompilerOptionsValue(opt, value)) {
+            var optType = opt.type;
+            if (optType === "list" && ts.isArray(value)) {
+                return convertJsonOptionOfListType(opt, value, basePath, errors);
             }
-            else if (ts.isIdentifier(e)) {
-                return action(e, lookupSymbolForPropertyAccess(e), parent);
+            else if (!ts.isString(optType)) {
+                return convertJsonOptionOfCustomType(opt, value, errors);
             }
-            else {
-                var s = forEachIdentifierInEntityName(e.expression, parent, action);
-                if (!s || !s.exports)
-                    return ts.Debug.fail();
-                return action(e.name, s.exports.get(e.name.escapedText), s);
+            return normalizeNonListOptionValue(opt, basePath, value);
+        }
+        else {
+            errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, opt.name, getCompilerOptionValueTypeString(opt)));
+        }
+    }
+    function normalizeOptionValue(option, basePath, value) {
+        if (isNullOrUndefined(value))
+            return undefined;
+        if (option.type === "list") {
+            var listOption_1 = option;
+            if (listOption_1.element.isFilePath || !ts.isString(listOption_1.element.type)) {
+                return ts.filter(ts.map(value, function (v) { return normalizeOptionValue(listOption_1.element, basePath, v); }), function (v) { return !!v; });
+            }
+            return value;
+        }
+        else if (!ts.isString(option.type)) {
+            return option.type.get(ts.isString(value) ? value.toLowerCase() : value);
+        }
+        return normalizeNonListOptionValue(option, basePath, value);
+    }
+    function normalizeNonListOptionValue(option, basePath, value) {
+        if (option.isFilePath) {
+            value = ts.normalizePath(ts.combinePaths(basePath, value));
+            if (value === "") {
+                value = ".";
             }
         }
-        function bindCallExpression(node) {
-            if (!file.commonJsModuleIndicator && ts.isRequireCall(node, false)) {
-                setCommonJsModuleIndicator(node);
+        return value;
+    }
+    function convertJsonOptionOfCustomType(opt, value, errors) {
+        if (isNullOrUndefined(value))
+            return undefined;
+        var key = value.toLowerCase();
+        var val = opt.type.get(key);
+        if (val !== undefined) {
+            return val;
+        }
+        else {
+            errors.push(createCompilerDiagnosticForInvalidCustomType(opt));
+        }
+    }
+    function convertJsonOptionOfListType(option, values, basePath, errors) {
+        return ts.filter(ts.map(values, function (v) { return convertJsonOption(option.element, v, basePath, errors); }), function (v) { return !!v; });
+    }
+    function trimString(s) {
+        return typeof s.trim === "function" ? s.trim() : s.replace(/^[\s]+|[\s]+$/g, "");
+    }
+    /**
+     * Tests for a path that ends in a recursive directory wildcard.
+     * Matches **, \**, **\, and \**\, but not a**b.
+     *
+     * NOTE: used \ in place of / above to avoid issues with multiline comments.
+     *
+     * Breakdown:
+     *  (^|\/)      # matches either the beginning of the string or a directory separator.
+     *  \*\*        # matches the recursive directory wildcard "**".
+     *  \/?$        # matches an optional trailing directory separator at the end of the string.
+     */
+    var invalidTrailingRecursionPattern = /(^|\/)\*\*\/?$/;
+    /**
+     * Tests for a path where .. appears after a recursive directory wildcard.
+     * Matches **\..\*, **\a\..\*, and **\.., but not ..\**\*
+     *
+     * NOTE: used \ in place of / above to avoid issues with multiline comments.
+     *
+     * Breakdown:
+     *  (^|\/)      # matches either the beginning of the string or a directory separator.
+     *  \*\*\/      # matches a recursive directory wildcard "**" followed by a directory separator.
+     *  (.*\/)?     # optionally matches any number of characters followed by a directory separator.
+     *  \.\.        # matches a parent directory path component ".."
+     *  ($|\/)      # matches either the end of the string or a directory separator.
+     */
+    var invalidDotDotAfterRecursiveWildcardPattern = /(^|\/)\*\*\/(.*\/)?\.\.($|\/)/;
+    /**
+     * Tests for a path containing a wildcard character in a directory component of the path.
+     * Matches \*\, \?\, and \a*b\, but not \a\ or \a\*.
+     *
+     * NOTE: used \ in place of / above to avoid issues with multiline comments.
+     *
+     * Breakdown:
+     *  \/          # matches a directory separator.
+     *  [^/]*?      # matches any number of characters excluding directory separators (non-greedy).
+     *  [*?]        # matches either a wildcard character (* or ?)
+     *  [^/]*       # matches any number of characters excluding directory separators (greedy).
+     *  \/          # matches a directory separator.
+     */
+    var watchRecursivePattern = /\/[^/]*?[*?][^/]*\//;
+    /**
+     * Matches the portion of a wildcard path that does not contain wildcards.
+     * Matches \a of \a\*, or \a\b\c of \a\b\c\?\d.
+     *
+     * NOTE: used \ in place of / above to avoid issues with multiline comments.
+     *
+     * Breakdown:
+     *  ^                   # matches the beginning of the string
+     *  [^*?]*              # matches any number of non-wildcard characters
+     *  (?=\/[^/]*[*?])     # lookahead that matches a directory separator followed by
+     *                      # a path component that contains at least one wildcard character (* or ?).
+     */
+    var wildcardDirectoryPattern = /^[^*?]*(?=\/[^/]*[*?])/;
+    /**
+     * Expands an array of file specifications.
+     *
+     * @param filesSpecs The literal file names to include.
+     * @param includeSpecs The wildcard file specifications to include.
+     * @param excludeSpecs The wildcard file specifications to exclude.
+     * @param basePath The base path for any relative file specifications.
+     * @param options Compiler options.
+     * @param host The host used to resolve files and directories.
+     * @param errors An array for diagnostic reporting.
+     */
+    function matchFileNames(filesSpecs, includeSpecs, excludeSpecs, basePath, options, host, errors, extraFileExtensions, jsonSourceFile) {
+        basePath = ts.normalizePath(basePath);
+        var validatedIncludeSpecs, validatedExcludeSpecs;
+        // The exclude spec list is converted into a regular expression, which allows us to quickly
+        // test whether a file or directory should be excluded before recursively traversing the
+        // file system.
+        if (includeSpecs) {
+            validatedIncludeSpecs = validateSpecs(includeSpecs, errors, /*allowTrailingRecursion*/ false, jsonSourceFile, "include");
+        }
+        if (excludeSpecs) {
+            validatedExcludeSpecs = validateSpecs(excludeSpecs, errors, /*allowTrailingRecursion*/ true, jsonSourceFile, "exclude");
+        }
+        // Wildcard directories (provided as part of a wildcard path) are stored in a
+        // file map that marks whether it was a regular wildcard match (with a `*` or `?` token),
+        // or a recursive directory. This information is used by filesystem watchers to monitor for
+        // new entries in these paths.
+        var wildcardDirectories = getWildcardDirectories(validatedIncludeSpecs, validatedExcludeSpecs, basePath, host.useCaseSensitiveFileNames);
+        var spec = { filesSpecs: filesSpecs, referencesSpecs: undefined, includeSpecs: includeSpecs, excludeSpecs: excludeSpecs, validatedIncludeSpecs: validatedIncludeSpecs, validatedExcludeSpecs: validatedExcludeSpecs, wildcardDirectories: wildcardDirectories };
+        return getFileNamesFromConfigSpecs(spec, basePath, options, host, extraFileExtensions);
+    }
+    /**
+     * Gets the file names from the provided config file specs that contain, files, include, exclude and
+     * other properties needed to resolve the file names
+     * @param spec The config file specs extracted with file names to include, wildcards to include/exclude and other details
+     * @param basePath The base path for any relative file specifications.
+     * @param options Compiler options.
+     * @param host The host used to resolve files and directories.
+     * @param extraFileExtensions optionaly file extra file extension information from host
+     */
+    /* @internal */
+    function getFileNamesFromConfigSpecs(spec, basePath, options, host, extraFileExtensions) {
+        if (extraFileExtensions === void 0) { extraFileExtensions = []; }
+        basePath = ts.normalizePath(basePath);
+        var keyMapper = host.useCaseSensitiveFileNames ? ts.identity : ts.toLowerCase;
+        // Literal file names (provided via the "files" array in tsconfig.json) are stored in a
+        // file map with a possibly case insensitive key. We use this map later when when including
+        // wildcard paths.
+        var literalFileMap = ts.createMap();
+        // Wildcard paths (provided via the "includes" array in tsconfig.json) are stored in a
+        // file map with a possibly case insensitive key. We use this map to store paths matched
+        // via wildcard, and to handle extension priority.
+        var wildcardFileMap = ts.createMap();
+        var filesSpecs = spec.filesSpecs, validatedIncludeSpecs = spec.validatedIncludeSpecs, validatedExcludeSpecs = spec.validatedExcludeSpecs, wildcardDirectories = spec.wildcardDirectories;
+        // Rather than requery this for each file and filespec, we query the supported extensions
+        // once and store it on the expansion context.
+        var supportedExtensions = ts.getSupportedExtensions(options, extraFileExtensions);
+        // Literal files are always included verbatim. An "include" or "exclude" specification cannot
+        // remove a literal file.
+        if (filesSpecs) {
+            for (var _i = 0, filesSpecs_1 = filesSpecs; _i < filesSpecs_1.length; _i++) {
+                var fileName = filesSpecs_1[_i];
+                var file = ts.getNormalizedAbsolutePath(fileName, basePath);
+                literalFileMap.set(keyMapper(file), file);
             }
         }
-        function bindClassLikeDeclaration(node) {
-            if (node.kind === 235) {
-                bindBlockScopedDeclaration(node, 32, 68008383);
-            }
-            else {
-                var bindingName = node.name ? node.name.escapedText : "__class";
-                bindAnonymousDeclaration(node, 32, bindingName);
-                if (node.name) {
-                    classifiableNames.set(node.name.escapedText, true);
+        if (validatedIncludeSpecs && validatedIncludeSpecs.length > 0) {
+            for (var _a = 0, _b = host.readDirectory(basePath, supportedExtensions, validatedExcludeSpecs, validatedIncludeSpecs, /*depth*/ undefined); _a < _b.length; _a++) {
+                var file = _b[_a];
+                // If we have already included a literal or wildcard path with a
+                // higher priority extension, we should skip this file.
+                //
+                // This handles cases where we may encounter both <file>.ts and
+                // <file>.d.ts (or <file>.js if "allowJs" is enabled) in the same
+                // directory when they are compilation outputs.
+                if (hasFileWithHigherPriorityExtension(file, literalFileMap, wildcardFileMap, supportedExtensions, keyMapper)) {
+                    continue;
                 }
-            }
-            var symbol = node.symbol;
-            var prototypeSymbol = createSymbol(4 | 4194304, "prototype");
-            var symbolExport = symbol.exports.get(prototypeSymbol.escapedName);
-            if (symbolExport) {
-                if (node.name) {
-                    node.name.parent = node;
-                }
-                file.bindDiagnostics.push(createDiagnosticForNode(symbolExport.declarations[0], ts.Diagnostics.Duplicate_identifier_0, ts.symbolName(prototypeSymbol)));
-            }
-            symbol.exports.set(prototypeSymbol.escapedName, prototypeSymbol);
-            prototypeSymbol.parent = symbol;
-        }
-        function bindEnumDeclaration(node) {
-            return ts.isConst(node)
-                ? bindBlockScopedDeclaration(node, 128, 68008831)
-                : bindBlockScopedDeclaration(node, 256, 68008191);
-        }
-        function bindVariableDeclarationOrBindingElement(node) {
-            if (inStrictMode) {
-                checkStrictModeEvalOrArguments(node, node.name);
-            }
-            if (!ts.isBindingPattern(node.name)) {
-                if (ts.isBlockOrCatchScoped(node)) {
-                    bindBlockScopedVariableDeclaration(node);
-                }
-                else if (ts.isParameterDeclaration(node)) {
-                    declareSymbolAndAddToSymbolTable(node, 1, 67216319);
-                }
-                else {
-                    declareSymbolAndAddToSymbolTable(node, 1, 67216318);
+                // We may have included a wildcard path with a lower priority
+                // extension due to the user-defined order of entries in the
+                // "include" array. If there is a lower priority extension in the
+                // same directory, we should remove it.
+                removeWildcardFilesWithLowerPriorityExtension(file, wildcardFileMap, supportedExtensions, keyMapper);
+                var key = keyMapper(file);
+                if (!literalFileMap.has(key) && !wildcardFileMap.has(key)) {
+                    wildcardFileMap.set(key, file);
                 }
             }
         }
-        function bindParameter(node) {
-            if (node.kind === 293 && container.kind !== 288) {
-                return;
-            }
-            if (inStrictMode && !(node.flags & 4194304)) {
-                checkStrictModeEvalOrArguments(node, node.name);
-            }
-            if (ts.isBindingPattern(node.name)) {
-                bindAnonymousDeclaration(node, 1, "__" + node.parent.parameters.indexOf(node));
-            }
-            else {
-                declareSymbolAndAddToSymbolTable(node, 1, 67216319);
-            }
-            if (ts.isParameterPropertyDeclaration(node)) {
-                var classDeclaration = node.parent.parent;
-                declareSymbol(classDeclaration.symbol.members, classDeclaration.symbol, node, 4 | (node.questionToken ? 16777216 : 0), 0);
+        var literalFiles = ts.arrayFrom(literalFileMap.values());
+        var wildcardFiles = ts.arrayFrom(wildcardFileMap.values());
+        var projectReferences = spec.referencesSpecs && spec.referencesSpecs.map(function (r) {
+            return __assign({}, r, { path: ts.getNormalizedAbsolutePath(r.path, basePath) });
+        });
+        return {
+            fileNames: literalFiles.concat(wildcardFiles),
+            projectReferences: projectReferences,
+            wildcardDirectories: wildcardDirectories,
+            spec: spec
+        };
+    }
+    ts.getFileNamesFromConfigSpecs = getFileNamesFromConfigSpecs;
+    function validateSpecs(specs, errors, allowTrailingRecursion, jsonSourceFile, specKey) {
+        return specs.filter(function (spec) {
+            var diag = specToDiagnostic(spec, allowTrailingRecursion);
+            if (diag !== undefined) {
+                errors.push(createDiagnostic(diag, spec));
             }
+            return diag === undefined;
+        });
+        function createDiagnostic(message, spec) {
+            var element = ts.getTsConfigPropArrayElementValue(jsonSourceFile, specKey, spec);
+            return element ?
+                ts.createDiagnosticForNodeInSourceFile(jsonSourceFile, element, message, spec) :
+                ts.createCompilerDiagnostic(message, spec);
         }
-        function bindFunctionDeclaration(node) {
-            if (!file.isDeclarationFile && !(node.flags & 4194304)) {
-                if (ts.isAsyncFunction(node)) {
-                    emitFlags |= 1024;
+    }
+    function specToDiagnostic(spec, allowTrailingRecursion) {
+        if (!allowTrailingRecursion && invalidTrailingRecursionPattern.test(spec)) {
+            return ts.Diagnostics.File_specification_cannot_end_in_a_recursive_directory_wildcard_Asterisk_Asterisk_Colon_0;
+        }
+        else if (invalidDotDotAfterRecursiveWildcardPattern.test(spec)) {
+            return ts.Diagnostics.File_specification_cannot_contain_a_parent_directory_that_appears_after_a_recursive_directory_wildcard_Asterisk_Asterisk_Colon_0;
+        }
+    }
+    /**
+     * Gets directories in a set of include patterns that should be watched for changes.
+     */
+    function getWildcardDirectories(include, exclude, path, useCaseSensitiveFileNames) {
+        // We watch a directory recursively if it contains a wildcard anywhere in a directory segment
+        // of the pattern:
+        //
+        //  /a/b/**/d   - Watch /a/b recursively to catch changes to any d in any subfolder recursively
+        //  /a/b/*/d    - Watch /a/b recursively to catch any d in any immediate subfolder, even if a new subfolder is added
+        //  /a/b        - Watch /a/b recursively to catch changes to anything in any recursive subfoler
+        //
+        // We watch a directory without recursion if it contains a wildcard in the file segment of
+        // the pattern:
+        //
+        //  /a/b/*      - Watch /a/b directly to catch any new file
+        //  /a/b/a?z    - Watch /a/b directly to catch any new file matching a?z
+        var rawExcludeRegex = ts.getRegularExpressionForWildcard(exclude, path, "exclude");
+        var excludeRegex = rawExcludeRegex && new RegExp(rawExcludeRegex, useCaseSensitiveFileNames ? "" : "i");
+        var wildcardDirectories = {};
+        if (include !== undefined) {
+            var recursiveKeys = [];
+            for (var _i = 0, include_1 = include; _i < include_1.length; _i++) {
+                var file = include_1[_i];
+                var spec = ts.normalizePath(ts.combinePaths(path, file));
+                if (excludeRegex && excludeRegex.test(spec)) {
+                    continue;
                 }
-            }
-            checkStrictModeFunctionName(node);
-            if (inStrictMode) {
-                checkStrictModeFunctionDeclaration(node);
-                bindBlockScopedDeclaration(node, 16, 67215791);
-            }
-            else {
-                declareSymbolAndAddToSymbolTable(node, 16, 67215791);
-            }
-        }
-        function bindFunctionExpression(node) {
-            if (!file.isDeclarationFile && !(node.flags & 4194304)) {
-                if (ts.isAsyncFunction(node)) {
-                    emitFlags |= 1024;
-                }
-            }
-            if (currentFlow) {
-                node.flowNode = currentFlow;
-            }
-            checkStrictModeFunctionName(node);
-            var bindingName = node.name ? node.name.escapedText : "__function";
-            return bindAnonymousDeclaration(node, 16, bindingName);
-        }
-        function bindPropertyOrMethodOrAccessor(node, symbolFlags, symbolExcludes) {
-            if (!file.isDeclarationFile && !(node.flags & 4194304) && ts.isAsyncFunction(node)) {
-                emitFlags |= 1024;
-            }
-            if (currentFlow && ts.isObjectLiteralOrClassExpressionMethod(node)) {
-                node.flowNode = currentFlow;
-            }
-            return ts.hasDynamicName(node)
-                ? bindAnonymousDeclaration(node, symbolFlags, "__computed")
-                : declareSymbolAndAddToSymbolTable(node, symbolFlags, symbolExcludes);
-        }
-        function getInferTypeContainer(node) {
-            var extendsType = ts.findAncestor(node, function (n) { return n.parent && ts.isConditionalTypeNode(n.parent) && n.parent.extendsType === n; });
-            return extendsType && extendsType.parent;
-        }
-        function bindTypeParameter(node) {
-            if (ts.isJSDocTemplateTag(node.parent)) {
-                var container_1 = ts.find(node.parent.parent.tags, ts.isJSDocTypeAlias) || ts.getHostSignatureFromJSDoc(node.parent);
-                if (container_1) {
-                    if (!container_1.locals) {
-                        container_1.locals = ts.createSymbolTable();
-                    }
-                    declareSymbol(container_1.locals, undefined, node, 262144, 67639784);
-                }
-                else {
-                    declareSymbolAndAddToSymbolTable(node, 262144, 67639784);
-                }
-            }
-            else if (node.parent.kind === 172) {
-                var container_2 = getInferTypeContainer(node.parent);
-                if (container_2) {
-                    if (!container_2.locals) {
-                        container_2.locals = ts.createSymbolTable();
-                    }
-                    declareSymbol(container_2.locals, undefined, node, 262144, 67639784);
-                }
-                else {
-                    bindAnonymousDeclaration(node, 262144, getDeclarationName(node));
-                }
-            }
-            else {
-                declareSymbolAndAddToSymbolTable(node, 262144, 67639784);
-            }
-        }
-        function shouldReportErrorOnModuleDeclaration(node) {
-            var instanceState = getModuleInstanceState(node);
-            return instanceState === 1 || (instanceState === 2 && !!options.preserveConstEnums);
-        }
-        function checkUnreachable(node) {
-            if (!(currentFlow.flags & 1)) {
-                return false;
-            }
-            if (currentFlow === unreachableFlow) {
-                var reportError = (ts.isStatementButNotDeclaration(node) && node.kind !== 215) ||
-                    node.kind === 235 ||
-                    (node.kind === 239 && shouldReportErrorOnModuleDeclaration(node)) ||
-                    (node.kind === 238 && (!ts.isConstEnumDeclaration(node) || options.preserveConstEnums));
-                if (reportError) {
-                    currentFlow = reportedUnreachableFlow;
-                    if (!options.allowUnreachableCode) {
-                        var isError = ts.unreachableCodeIsError(options) &&
-                            !(node.flags & 4194304) &&
-                            (!ts.isVariableStatement(node) ||
-                                !!(ts.getCombinedNodeFlags(node.declarationList) & 3) ||
-                                node.declarationList.declarations.some(function (d) { return !!d.initializer; }));
-                        errorOrSuggestionOnFirstToken(isError, node, ts.Diagnostics.Unreachable_code_detected);
+                var match = getWildcardDirectoryFromSpec(spec, useCaseSensitiveFileNames);
+                if (match) {
+                    var key = match.key, flags = match.flags;
+                    var existingFlags = wildcardDirectories[key];
+                    if (existingFlags === undefined || existingFlags < flags) {
+                        wildcardDirectories[key] = flags;
+                        if (flags === 1 /* Recursive */) {
+                            recursiveKeys.push(key);
+                        }
                     }
                 }
             }
-            return true;
-        }
-    }
-    function isExportsOrModuleExportsOrAlias(sourceFile, node) {
-        return ts.isExportsIdentifier(node) ||
-            ts.isModuleExportsPropertyAccessExpression(node) ||
-            ts.isIdentifier(node) && isNameOfExportsOrModuleExportsAliasDeclaration(sourceFile, node);
-    }
-    ts.isExportsOrModuleExportsOrAlias = isExportsOrModuleExportsOrAlias;
-    function isNameOfExportsOrModuleExportsAliasDeclaration(sourceFile, node) {
-        var symbol = lookupSymbolForNameWorker(sourceFile, node.escapedText);
-        return !!symbol && !!symbol.valueDeclaration && ts.isVariableDeclaration(symbol.valueDeclaration) &&
-            !!symbol.valueDeclaration.initializer && isExportsOrModuleExportsOrAliasOrAssignment(sourceFile, symbol.valueDeclaration.initializer);
-    }
-    function isExportsOrModuleExportsOrAliasOrAssignment(sourceFile, node) {
-        return isExportsOrModuleExportsOrAlias(sourceFile, node) ||
-            (ts.isAssignmentExpression(node, true) && (isExportsOrModuleExportsOrAliasOrAssignment(sourceFile, node.left) || isExportsOrModuleExportsOrAliasOrAssignment(sourceFile, node.right)));
-    }
-    function lookupSymbolForNameWorker(container, name) {
-        var local = container.locals && container.locals.get(name);
-        if (local) {
-            return local.exportSymbol || local;
-        }
-        return container.symbol && container.symbol.exports && container.symbol.exports.get(name);
-    }
-    function computeTransformFlagsForNode(node, subtreeFlags) {
-        var kind = node.kind;
-        switch (kind) {
-            case 187:
-                return computeCallExpression(node, subtreeFlags);
-            case 188:
-                return computeNewExpression(node, subtreeFlags);
-            case 239:
-                return computeModuleDeclaration(node, subtreeFlags);
-            case 191:
-                return computeParenthesizedExpression(node, subtreeFlags);
-            case 200:
-                return computeBinaryExpression(node, subtreeFlags);
-            case 216:
-                return computeExpressionStatement(node, subtreeFlags);
-            case 149:
-                return computeParameter(node, subtreeFlags);
-            case 193:
-                return computeArrowFunction(node, subtreeFlags);
-            case 192:
-                return computeFunctionExpression(node, subtreeFlags);
-            case 234:
-                return computeFunctionDeclaration(node, subtreeFlags);
-            case 232:
-                return computeVariableDeclaration(node, subtreeFlags);
-            case 233:
-                return computeVariableDeclarationList(node, subtreeFlags);
-            case 214:
-                return computeVariableStatement(node, subtreeFlags);
-            case 228:
-                return computeLabeledStatement(node, subtreeFlags);
-            case 235:
-                return computeClassDeclaration(node, subtreeFlags);
-            case 205:
-                return computeClassExpression(node, subtreeFlags);
-            case 268:
-                return computeHeritageClause(node, subtreeFlags);
-            case 269:
-                return computeCatchClause(node, subtreeFlags);
-            case 207:
-                return computeExpressionWithTypeArguments(node, subtreeFlags);
-            case 155:
-                return computeConstructor(node, subtreeFlags);
-            case 152:
-                return computePropertyDeclaration(node, subtreeFlags);
-            case 154:
-                return computeMethod(node, subtreeFlags);
-            case 156:
-            case 157:
-                return computeAccessor(node, subtreeFlags);
-            case 243:
-                return computeImportEquals(node, subtreeFlags);
-            case 185:
-                return computePropertyAccess(node, subtreeFlags);
-            case 186:
-                return computeElementAccess(node, subtreeFlags);
-            default:
-                return computeOther(node, kind, subtreeFlags);
-        }
-    }
-    ts.computeTransformFlagsForNode = computeTransformFlagsForNode;
-    function computeCallExpression(node, subtreeFlags) {
-        var transformFlags = subtreeFlags;
-        var expression = node.expression;
-        if (node.typeArguments) {
-            transformFlags |= 3;
-        }
-        if (subtreeFlags & 524288
-            || (expression.transformFlags & (134217728 | 268435456))) {
-            transformFlags |= 192;
-            if (expression.transformFlags & 268435456) {
-                transformFlags |= 16384;
+            // Remove any subpaths under an existing recursively watched directory.
+            for (var key in wildcardDirectories) {
+                if (ts.hasProperty(wildcardDirectories, key)) {
+                    for (var _a = 0, recursiveKeys_1 = recursiveKeys; _a < recursiveKeys_1.length; _a++) {
+                        var recursiveKey = recursiveKeys_1[_a];
+                        if (key !== recursiveKey && ts.containsPath(recursiveKey, key, path, !useCaseSensitiveFileNames)) {
+                            delete wildcardDirectories[key];
+                        }
+                    }
+                }
             }
         }
-        if (expression.kind === 91) {
-            transformFlags |= 67108864;
-            if (subtreeFlags & 16384) {
-                transformFlags |= 32768;
-            }
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~940049729;
+        return wildcardDirectories;
     }
-    function computeNewExpression(node, subtreeFlags) {
-        var transformFlags = subtreeFlags;
-        if (node.typeArguments) {
-            transformFlags |= 3;
-        }
-        if (subtreeFlags & 524288) {
-            transformFlags |= 192;
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~940049729;
-    }
-    function computeBinaryExpression(node, subtreeFlags) {
-        var transformFlags = subtreeFlags;
-        var operatorTokenKind = node.operatorToken.kind;
-        var leftKind = node.left.kind;
-        if (operatorTokenKind === 58 && leftKind === 184) {
-            transformFlags |= 8 | 192 | 3072;
-        }
-        else if (operatorTokenKind === 58 && leftKind === 183) {
-            transformFlags |= 192 | 3072;
-        }
-        else if (operatorTokenKind === 40
-            || operatorTokenKind === 62) {
-            transformFlags |= 32;
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~939525441;
-    }
-    function computeParameter(node, subtreeFlags) {
-        var transformFlags = subtreeFlags;
-        var name = node.name;
-        var initializer = node.initializer;
-        var dotDotDotToken = node.dotDotDotToken;
-        if (node.questionToken
-            || node.type
-            || subtreeFlags & 4096
-            || ts.isThisIdentifier(name)) {
-            transformFlags |= 3;
-        }
-        if (ts.hasModifier(node, 92)) {
-            transformFlags |= 3 | 262144;
-        }
-        if (subtreeFlags & 1048576) {
-            transformFlags |= 8;
-        }
-        if (subtreeFlags & 8388608 || initializer || dotDotDotToken) {
-            transformFlags |= 192 | 131072;
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~939525441;
-    }
-    function computeParenthesizedExpression(node, subtreeFlags) {
-        var transformFlags = subtreeFlags;
-        var expression = node.expression;
-        var expressionKind = expression.kind;
-        var expressionTransformFlags = expression.transformFlags;
-        if (expressionKind === 208
-            || expressionKind === 190) {
-            transformFlags |= 3;
-        }
-        if (expressionTransformFlags & 1024) {
-            transformFlags |= 1024;
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~536872257;
-    }
-    function computeClassDeclaration(node, subtreeFlags) {
-        var transformFlags;
-        if (ts.hasModifier(node, 2)) {
-            transformFlags = 3;
-        }
-        else {
-            transformFlags = subtreeFlags | 192;
-            if ((subtreeFlags & 274432)
-                || node.typeParameters) {
-                transformFlags |= 3;
-            }
-            if (subtreeFlags & 65536) {
-                transformFlags |= 16384;
-            }
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~942011713;
-    }
-    function computeClassExpression(node, subtreeFlags) {
-        var transformFlags = subtreeFlags | 192;
-        if (subtreeFlags & 274432
-            || node.typeParameters) {
-            transformFlags |= 3;
-        }
-        if (subtreeFlags & 65536) {
-            transformFlags |= 16384;
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~942011713;
-    }
-    function computeHeritageClause(node, subtreeFlags) {
-        var transformFlags = subtreeFlags;
-        switch (node.token) {
-            case 85:
-                transformFlags |= 192;
-                break;
-            case 108:
-                transformFlags |= 3;
-                break;
-            default:
-                ts.Debug.fail("Unexpected token for heritage clause");
-                break;
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~939525441;
-    }
-    function computeCatchClause(node, subtreeFlags) {
-        var transformFlags = subtreeFlags;
-        if (!node.variableDeclaration) {
-            transformFlags |= 8;
-        }
-        else if (ts.isBindingPattern(node.variableDeclaration.name)) {
-            transformFlags |= 192;
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~940574017;
-    }
-    function computeExpressionWithTypeArguments(node, subtreeFlags) {
-        var transformFlags = subtreeFlags | 192;
-        if (node.typeArguments) {
-            transformFlags |= 3;
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~939525441;
-    }
-    function computeConstructor(node, subtreeFlags) {
-        var transformFlags = subtreeFlags;
-        if (ts.hasModifier(node, 2270)
-            || !node.body) {
-            transformFlags |= 3;
-        }
-        if (subtreeFlags & 1048576) {
-            transformFlags |= 8;
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~1003668801;
-    }
-    function computeMethod(node, subtreeFlags) {
-        var transformFlags = subtreeFlags | 192;
-        if (node.decorators
-            || ts.hasModifier(node, 2270)
-            || node.typeParameters
-            || node.type
-            || (node.name && ts.isComputedPropertyName(node.name))
-            || !node.body) {
-            transformFlags |= 3;
-        }
-        if (subtreeFlags & 1048576) {
-            transformFlags |= 8;
-        }
-        if (ts.hasModifier(node, 256)) {
-            transformFlags |= node.asteriskToken ? 8 : 16;
-        }
-        if (node.asteriskToken) {
-            transformFlags |= 768;
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~1003668801;
-    }
-    function computeAccessor(node, subtreeFlags) {
-        var transformFlags = subtreeFlags;
-        if (node.decorators
-            || ts.hasModifier(node, 2270)
-            || node.type
-            || (node.name && ts.isComputedPropertyName(node.name))
-            || !node.body) {
-            transformFlags |= 3;
-        }
-        if (subtreeFlags & 1048576) {
-            transformFlags |= 8;
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~1003668801;
-    }
-    function computePropertyDeclaration(node, subtreeFlags) {
-        var transformFlags = subtreeFlags | 3;
-        if (node.initializer || ts.isComputedPropertyName(node.name)) {
-            transformFlags |= 8192;
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~939525441;
-    }
-    function computeFunctionDeclaration(node, subtreeFlags) {
-        var transformFlags;
-        var modifierFlags = ts.getModifierFlags(node);
-        var body = node.body;
-        if (!body || (modifierFlags & 2)) {
-            transformFlags = 3;
-        }
-        else {
-            transformFlags = subtreeFlags | 33554432;
-            if (modifierFlags & 2270
-                || node.typeParameters
-                || node.type) {
-                transformFlags |= 3;
-            }
-            if (modifierFlags & 256) {
-                transformFlags |= node.asteriskToken ? 8 : 16;
-            }
-            if (subtreeFlags & 1048576) {
-                transformFlags |= 8;
-            }
-            if (subtreeFlags & 163840) {
-                transformFlags |= 192;
-            }
-            if (node.asteriskToken) {
-                transformFlags |= 768;
-            }
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~1003935041;
-    }
-    function computeFunctionExpression(node, subtreeFlags) {
-        var transformFlags = subtreeFlags;
-        if (ts.hasModifier(node, 2270)
-            || node.typeParameters
-            || node.type) {
-            transformFlags |= 3;
-        }
-        if (ts.hasModifier(node, 256)) {
-            transformFlags |= node.asteriskToken ? 8 : 16;
-        }
-        if (subtreeFlags & 1048576) {
-            transformFlags |= 8;
-        }
-        if (subtreeFlags & 163840) {
-            transformFlags |= 192;
-        }
-        if (node.asteriskToken) {
-            transformFlags |= 768;
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~1003935041;
-    }
-    function computeArrowFunction(node, subtreeFlags) {
-        var transformFlags = subtreeFlags | 192;
-        if (ts.hasModifier(node, 2270)
-            || node.typeParameters
-            || node.type) {
-            transformFlags |= 3;
-        }
-        if (ts.hasModifier(node, 256)) {
-            transformFlags |= 16;
-        }
-        if (subtreeFlags & 1048576) {
-            transformFlags |= 8;
-        }
-        if (subtreeFlags & 16384) {
-            transformFlags |= 32768;
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~1003902273;
-    }
-    function computePropertyAccess(node, subtreeFlags) {
-        var transformFlags = subtreeFlags;
-        if (transformFlags & 134217728) {
-            transformFlags ^= 134217728;
-            transformFlags |= 268435456;
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~671089985;
-    }
-    function computeElementAccess(node, subtreeFlags) {
-        var transformFlags = subtreeFlags;
-        var expression = node.expression;
-        var expressionFlags = expression.transformFlags;
-        if (expressionFlags & 134217728) {
-            transformFlags &= ~134217728;
-            transformFlags |= 268435456;
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~671089985;
-    }
-    function computeVariableDeclaration(node, subtreeFlags) {
-        var transformFlags = subtreeFlags;
-        transformFlags |= 192 | 8388608;
-        if (subtreeFlags & 1048576) {
-            transformFlags |= 8;
-        }
-        if (node.type) {
-            transformFlags |= 3;
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~939525441;
-    }
-    function computeVariableStatement(node, subtreeFlags) {
-        var transformFlags;
-        var declarationListTransformFlags = node.declarationList.transformFlags;
-        if (ts.hasModifier(node, 2)) {
-            transformFlags = 3;
-        }
-        else {
-            transformFlags = subtreeFlags;
-            if (declarationListTransformFlags & 8388608) {
-                transformFlags |= 192;
-            }
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~939525441;
-    }
-    function computeLabeledStatement(node, subtreeFlags) {
-        var transformFlags = subtreeFlags;
-        if (subtreeFlags & 4194304
-            && ts.isIterationStatement(node, true)) {
-            transformFlags |= 192;
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~939525441;
-    }
-    function computeImportEquals(node, subtreeFlags) {
-        var transformFlags = subtreeFlags;
-        if (!ts.isExternalModuleImportEqualsDeclaration(node)) {
-            transformFlags |= 3;
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~939525441;
-    }
-    function computeExpressionStatement(node, subtreeFlags) {
-        var transformFlags = subtreeFlags;
-        if (node.expression.transformFlags & 1024) {
-            transformFlags |= 192;
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~939525441;
-    }
-    function computeModuleDeclaration(node, subtreeFlags) {
-        var transformFlags = 3;
-        var modifierFlags = ts.getModifierFlags(node);
-        if ((modifierFlags & 2) === 0) {
-            transformFlags |= subtreeFlags;
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~977327425;
-    }
-    function computeVariableDeclarationList(node, subtreeFlags) {
-        var transformFlags = subtreeFlags | 33554432;
-        if (subtreeFlags & 8388608) {
-            transformFlags |= 192;
-        }
-        if (node.flags & 3) {
-            transformFlags |= 192 | 4194304;
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~948962625;
-    }
-    function computeOther(node, kind, subtreeFlags) {
-        var transformFlags = subtreeFlags;
-        var excludeFlags = 939525441;
-        switch (kind) {
-            case 120:
-            case 197:
-                transformFlags |= 8 | 16;
-                break;
-            case 190:
-            case 208:
-            case 301:
-                transformFlags |= 3;
-                excludeFlags = 536872257;
-                break;
-            case 114:
-            case 112:
-            case 113:
-            case 117:
-            case 124:
-            case 76:
-            case 238:
-            case 273:
-            case 209:
-            case 132:
-                transformFlags |= 3;
-                break;
-            case 255:
-            case 256:
-            case 257:
-            case 10:
-            case 258:
-            case 259:
-            case 260:
-            case 261:
-            case 262:
-            case 263:
-            case 264:
-            case 265:
-                transformFlags |= 4;
-                break;
-            case 13:
-            case 14:
-            case 15:
-            case 16:
-            case 202:
-            case 189:
-            case 271:
-            case 115:
-            case 210:
-                transformFlags |= 192;
-                break;
-            case 9:
-                if (node.hasExtendedUnicodeEscape) {
-                    transformFlags |= 192;
-                }
-                break;
-            case 8:
-                if (node.numericLiteralFlags & 384) {
-                    transformFlags |= 192;
-                }
-                break;
-            case 222:
-                if (node.awaitModifier) {
-                    transformFlags |= 8;
-                }
-                transformFlags |= 192;
-                break;
-            case 203:
-                transformFlags |= 8 | 192 | 16777216;
-                break;
-            case 119:
-            case 134:
-            case 131:
-            case 135:
-            case 137:
-            case 122:
-            case 138:
-            case 105:
-            case 148:
-            case 151:
-            case 153:
-            case 158:
-            case 159:
-            case 160:
-            case 161:
-            case 162:
-            case 163:
-            case 164:
-            case 165:
-            case 166:
-            case 167:
-            case 168:
-            case 169:
-            case 170:
-            case 171:
-            case 172:
-            case 173:
-            case 236:
-            case 237:
-            case 174:
-            case 175:
-            case 176:
-            case 177:
-            case 178:
-            case 242:
-                transformFlags = 3;
-                excludeFlags = -3;
-                break;
-            case 147:
-                transformFlags |= 2097152;
-                if (subtreeFlags & 16384) {
-                    transformFlags |= 65536;
-                }
-                break;
-            case 204:
-                transformFlags |= 192 | 524288;
-                break;
-            case 272:
-                transformFlags |= 8 | 1048576;
-                break;
-            case 97:
-                transformFlags |= 192 | 134217728;
-                excludeFlags = 536872257;
-                break;
-            case 99:
-                transformFlags |= 16384;
-                break;
-            case 180:
-                transformFlags |= 192 | 8388608;
-                if (subtreeFlags & 524288) {
-                    transformFlags |= 8 | 1048576;
-                }
-                excludeFlags = 940049729;
-                break;
-            case 181:
-                transformFlags |= 192 | 8388608;
-                excludeFlags = 940049729;
-                break;
-            case 182:
-                transformFlags |= 192;
-                if (node.dotDotDotToken) {
-                    transformFlags |= 524288;
-                }
-                break;
-            case 150:
-                transformFlags |= 3 | 4096;
-                break;
-            case 184:
-                excludeFlags = 942740801;
-                if (subtreeFlags & 2097152) {
-                    transformFlags |= 192;
-                }
-                if (subtreeFlags & 65536) {
-                    transformFlags |= 16384;
-                }
-                if (subtreeFlags & 1048576) {
-                    transformFlags |= 8;
-                }
-                break;
-            case 183:
-            case 188:
-                excludeFlags = 940049729;
-                if (subtreeFlags & 524288) {
-                    transformFlags |= 192;
-                }
-                break;
-            case 218:
-            case 219:
-            case 220:
-            case 221:
-                if (subtreeFlags & 4194304) {
-                    transformFlags |= 192;
-                }
-                break;
-            case 274:
-                if (subtreeFlags & 32768) {
-                    transformFlags |= 192;
-                }
-                break;
-            case 225:
-                transformFlags |= 33554432 | 8;
-                break;
-            case 223:
-            case 224:
-                transformFlags |= 33554432;
-                break;
-        }
-        node.transformFlags = transformFlags | 536870912;
-        return transformFlags & ~excludeFlags;
-    }
-    function getTransformFlagsSubtreeExclusions(kind) {
-        if (kind >= 161 && kind <= 179) {
-            return -3;
-        }
-        switch (kind) {
-            case 187:
-            case 188:
-            case 183:
-                return 940049729;
-            case 239:
-                return 977327425;
-            case 149:
-                return 939525441;
-            case 193:
-                return 1003902273;
-            case 192:
-            case 234:
-                return 1003935041;
-            case 233:
-                return 948962625;
-            case 235:
-            case 205:
-                return 942011713;
-            case 155:
-                return 1003668801;
-            case 154:
-            case 156:
-            case 157:
-                return 1003668801;
-            case 119:
-            case 134:
-            case 131:
-            case 137:
-            case 135:
-            case 122:
-            case 138:
-            case 105:
-            case 148:
-            case 151:
-            case 153:
-            case 158:
-            case 159:
-            case 160:
-            case 236:
-            case 237:
-                return -3;
-            case 184:
-                return 942740801;
-            case 269:
-                return 940574017;
-            case 180:
-            case 181:
-                return 940049729;
-            case 190:
-            case 208:
-            case 301:
-            case 191:
-            case 97:
-                return 536872257;
-            case 185:
-            case 186:
-                return 671089985;
-            default:
-                return 939525441;
-        }
-    }
-    ts.getTransformFlagsSubtreeExclusions = getTransformFlagsSubtreeExclusions;
-    function setParentPointers(parent, child) {
-        child.parent = parent;
-        ts.forEachChild(child, function (grandchild) { return setParentPointers(child, grandchild); });
-    }
-})(ts || (ts = {}));
-var ts;
-(function (ts) {
-    function createGetSymbolWalker(getRestTypeOfSignature, getTypePredicateOfSignature, getReturnTypeOfSignature, getBaseTypes, resolveStructuredTypeMembers, getTypeOfSymbol, getResolvedSymbol, getIndexTypeOfStructuredType, getConstraintFromTypeParameter, getFirstIdentifier) {
-        return getSymbolWalker;
-        function getSymbolWalker(accept) {
-            if (accept === void 0) { accept = function () { return true; }; }
-            var visitedTypes = [];
-            var visitedSymbols = [];
+    function getWildcardDirectoryFromSpec(spec, useCaseSensitiveFileNames) {
+        var match = wildcardDirectoryPattern.exec(spec);
+        if (match) {
             return {
-                walkType: function (type) {
-                    try {
-                        visitType(type);
-                        return { visitedTypes: ts.getOwnValues(visitedTypes), visitedSymbols: ts.getOwnValues(visitedSymbols) };
-                    }
-                    finally {
-                        ts.clear(visitedTypes);
-                        ts.clear(visitedSymbols);
-                    }
-                },
-                walkSymbol: function (symbol) {
-                    try {
-                        visitSymbol(symbol);
-                        return { visitedTypes: ts.getOwnValues(visitedTypes), visitedSymbols: ts.getOwnValues(visitedSymbols) };
-                    }
-                    finally {
-                        ts.clear(visitedTypes);
-                        ts.clear(visitedSymbols);
-                    }
-                },
+                key: useCaseSensitiveFileNames ? match[0] : match[0].toLowerCase(),
+                flags: watchRecursivePattern.test(spec) ? 1 /* Recursive */ : 0 /* None */
             };
-            function visitType(type) {
-                if (!type) {
-                    return;
-                }
-                if (visitedTypes[type.id]) {
-                    return;
-                }
-                visitedTypes[type.id] = type;
-                var shouldBail = visitSymbol(type.symbol);
-                if (shouldBail)
-                    return;
-                if (type.flags & 131072) {
-                    var objectType = type;
-                    var objectFlags = objectType.objectFlags;
-                    if (objectFlags & 4) {
-                        visitTypeReference(type);
-                    }
-                    if (objectFlags & 32) {
-                        visitMappedType(type);
-                    }
-                    if (objectFlags & (1 | 2)) {
-                        visitInterfaceType(type);
-                    }
-                    if (objectFlags & (8 | 16)) {
-                        visitObjectType(objectType);
-                    }
-                }
-                if (type.flags & 65536) {
-                    visitTypeParameter(type);
-                }
-                if (type.flags & 786432) {
-                    visitUnionOrIntersectionType(type);
-                }
-                if (type.flags & 1048576) {
-                    visitIndexType(type);
-                }
-                if (type.flags & 2097152) {
-                    visitIndexedAccessType(type);
-                }
-            }
-            function visitTypeReference(type) {
-                visitType(type.target);
-                ts.forEach(type.typeArguments, visitType);
-            }
-            function visitTypeParameter(type) {
-                visitType(getConstraintFromTypeParameter(type));
-            }
-            function visitUnionOrIntersectionType(type) {
-                ts.forEach(type.types, visitType);
-            }
-            function visitIndexType(type) {
-                visitType(type.type);
-            }
-            function visitIndexedAccessType(type) {
-                visitType(type.objectType);
-                visitType(type.indexType);
-                visitType(type.constraint);
-            }
-            function visitMappedType(type) {
-                visitType(type.typeParameter);
-                visitType(type.constraintType);
-                visitType(type.templateType);
-                visitType(type.modifiersType);
-            }
-            function visitSignature(signature) {
-                var typePredicate = getTypePredicateOfSignature(signature);
-                if (typePredicate) {
-                    visitType(typePredicate.type);
-                }
-                ts.forEach(signature.typeParameters, visitType);
-                for (var _i = 0, _a = signature.parameters; _i < _a.length; _i++) {
-                    var parameter = _a[_i];
-                    visitSymbol(parameter);
-                }
-                visitType(getRestTypeOfSignature(signature));
-                visitType(getReturnTypeOfSignature(signature));
-            }
-            function visitInterfaceType(interfaceT) {
-                visitObjectType(interfaceT);
-                ts.forEach(interfaceT.typeParameters, visitType);
-                ts.forEach(getBaseTypes(interfaceT), visitType);
-                visitType(interfaceT.thisType);
-            }
-            function visitObjectType(type) {
-                var stringIndexType = getIndexTypeOfStructuredType(type, 0);
-                visitType(stringIndexType);
-                var numberIndexType = getIndexTypeOfStructuredType(type, 1);
-                visitType(numberIndexType);
-                var resolved = resolveStructuredTypeMembers(type);
-                for (var _i = 0, _a = resolved.callSignatures; _i < _a.length; _i++) {
-                    var signature = _a[_i];
-                    visitSignature(signature);
-                }
-                for (var _b = 0, _c = resolved.constructSignatures; _b < _c.length; _b++) {
-                    var signature = _c[_b];
-                    visitSignature(signature);
-                }
-                for (var _d = 0, _e = resolved.properties; _d < _e.length; _d++) {
-                    var p = _e[_d];
-                    visitSymbol(p);
-                }
-            }
-            function visitSymbol(symbol) {
-                if (!symbol) {
-                    return false;
-                }
-                var symbolId = ts.getSymbolId(symbol);
-                if (visitedSymbols[symbolId]) {
-                    return false;
-                }
-                visitedSymbols[symbolId] = symbol;
-                if (!accept(symbol)) {
-                    return true;
-                }
-                var t = getTypeOfSymbol(symbol);
-                visitType(t);
-                if (symbol.flags & 1952) {
-                    symbol.exports.forEach(visitSymbol);
-                }
-                ts.forEach(symbol.declarations, function (d) {
-                    if (d.type && d.type.kind === 165) {
-                        var query = d.type;
-                        var entity = getResolvedSymbol(getFirstIdentifier(query.exprName));
-                        visitSymbol(entity);
-                    }
-                });
-                return false;
+        }
+        if (ts.isImplicitGlob(spec)) {
+            return { key: spec, flags: 1 /* Recursive */ };
+        }
+        return undefined;
+    }
+    /**
+     * Determines whether a literal or wildcard file has already been included that has a higher
+     * extension priority.
+     *
+     * @param file The path to the file.
+     * @param extensionPriority The priority of the extension.
+     * @param context The expansion context.
+     */
+    function hasFileWithHigherPriorityExtension(file, literalFiles, wildcardFiles, extensions, keyMapper) {
+        var extensionPriority = ts.getExtensionPriority(file, extensions);
+        var adjustedExtensionPriority = ts.adjustExtensionPriority(extensionPriority, extensions);
+        for (var i = 0 /* Highest */; i < adjustedExtensionPriority; i++) {
+            var higherPriorityExtension = extensions[i];
+            var higherPriorityPath = keyMapper(ts.changeExtension(file, higherPriorityExtension));
+            if (literalFiles.has(higherPriorityPath) || wildcardFiles.has(higherPriorityPath)) {
+                return true;
             }
         }
+        return false;
+    }
+    /**
+     * Removes files included via wildcard expansion with a lower extension priority that have
+     * already been included.
+     *
+     * @param file The path to the file.
+     * @param extensionPriority The priority of the extension.
+     * @param context The expansion context.
+     */
+    function removeWildcardFilesWithLowerPriorityExtension(file, wildcardFiles, extensions, keyMapper) {
+        var extensionPriority = ts.getExtensionPriority(file, extensions);
+        var nextExtensionPriority = ts.getNextLowestExtensionPriority(extensionPriority, extensions);
+        for (var i = nextExtensionPriority; i < extensions.length; i++) {
+            var lowerPriorityExtension = extensions[i];
+            var lowerPriorityPath = keyMapper(ts.changeExtension(file, lowerPriorityExtension));
+            wildcardFiles.delete(lowerPriorityPath);
+        }
+    }
+    /**
+     * Produces a cleaned version of compiler options with personally identifiying info (aka, paths) removed.
+     * Also converts enum values back to strings.
+     */
+    /* @internal */
+    function convertCompilerOptionsForTelemetry(opts) {
+        var out = {};
+        for (var key in opts) {
+            if (opts.hasOwnProperty(key)) {
+                var type = getOptionFromName(key);
+                if (type !== undefined) { // Ignore unknown options
+                    out[key] = getOptionValueWithEmptyStrings(opts[key], type);
+                }
+            }
+        }
+        return out;
+    }
+    ts.convertCompilerOptionsForTelemetry = convertCompilerOptionsForTelemetry;
+    function getOptionValueWithEmptyStrings(value, option) {
+        switch (option.type) {
+            case "object": // "paths". Can't get any useful information from the value since we blank out strings, so just return "".
+                return "";
+            case "string": // Could be any arbitrary string -- use empty string instead.
+                return "";
+            case "number": // Allow numbers, but be sure to check it's actually a number.
+                return typeof value === "number" ? value : "";
+            case "boolean":
+                return typeof value === "boolean" ? value : "";
+            case "list":
+                var elementType_1 = option.element;
+                return ts.isArray(value) ? value.map(function (v) { return getOptionValueWithEmptyStrings(v, elementType_1); }) : "";
+            default:
+                return ts.forEachEntry(option.type, function (optionEnumValue, optionStringValue) {
+                    if (optionEnumValue === value) {
+                        return optionStringValue;
+                    }
+                }); // TODO: GH#18217
+        }
     }
-    ts.createGetSymbolWalker = createGetSymbolWalker;
 })(ts || (ts = {}));
 var ts;
 (function (ts) {
@@ -21852,6 +24239,7 @@ var ts;
         host.trace(ts.formatMessage.apply(undefined, arguments));
     }
     ts.trace = trace;
+    /* @internal */
     function isTraceEnabled(compilerOptions, host) {
         return !!compilerOptions.traceResolution && host.trace !== undefined;
     }
@@ -21860,15 +24248,20 @@ var ts;
         return r && { path: r.path, extension: r.ext, packageId: packageId };
     }
     function noPackageId(r) {
-        return withPackageId(undefined, r);
+        return withPackageId(/*packageId*/ undefined, r);
     }
+    /**
+     * Kinds of file that we are currently looking for.
+     * Typically there is one pass with Extensions.TypeScript, then a second pass with Extensions.JavaScript.
+     */
     var Extensions;
     (function (Extensions) {
         Extensions[Extensions["TypeScript"] = 0] = "TypeScript";
         Extensions[Extensions["JavaScript"] = 1] = "JavaScript";
         Extensions[Extensions["Json"] = 2] = "Json";
-        Extensions[Extensions["DtsOnly"] = 3] = "DtsOnly";
+        Extensions[Extensions["DtsOnly"] = 3] = "DtsOnly"; /** Only '.d.ts' */
     })(Extensions || (Extensions = {}));
+    /** Used with `Extensions.DtsOnly` to extract the path from TypeScript results. */
     function resolvedTypeScriptOnly(resolved) {
         if (!resolved) {
             return undefined;
@@ -21882,6 +24275,7 @@ var ts;
             failedLookupLocations: failedLookupLocations
         };
     }
+    /** Reads from "main" or "types"/"typings" depending on `extensions`. */
     function tryReadPackageJsonFields(readTypes, jsonContent, baseDirectory, state) {
         return readTypes ? tryReadFromField("typings") || tryReadFromField("types") : tryReadFromField("main");
         function tryReadFromField(fieldName) {
@@ -21905,6 +24299,7 @@ var ts;
             return path;
         }
     }
+    /* @internal */
     function readJson(path, host) {
         try {
             var jsonText = host.readFile(path);
@@ -21917,6 +24312,7 @@ var ts;
             return result.config;
         }
         catch (e) {
+            // gracefully handle if readFile fails or returns not JSON
             return {};
         }
     }
@@ -21937,9 +24333,14 @@ var ts;
         }
     }
     ts.getEffectiveTypeRoots = getEffectiveTypeRoots;
+    /**
+     * Returns the path to every node_modules/@types directory from some ancestor directory.
+     * Returns undefined if there are none.
+     */
     function getDefaultTypeRoots(currentDirectory, host) {
         if (!host.directoryExists) {
             return [ts.combinePaths(currentDirectory, nodeModulesAtTypes)];
+            // And if it doesn't exist, tough.
         }
         var typeRoots;
         ts.forEachAncestorDirectory(ts.normalizePath(currentDirectory), function (directory) {
@@ -21952,6 +24353,11 @@ var ts;
         return typeRoots;
     }
     var nodeModulesAtTypes = ts.combinePaths("node_modules", "@types");
+    /**
+     * @param {string | undefined} containingFile - file that contains type reference directive, can be undefined if containing file is unknown.
+     * This is possible in case if resolution is performed for directives specified via 'types' parameter. In this case initial path for secondary lookups
+     * is assumed to be the same as root directory of the project.
+     */
     function resolveTypeReferenceDirective(typeReferenceDirectiveName, containingFile, options, host) {
         var traceEnabled = isTraceEnabled(options, host);
         var moduleResolutionState = { compilerOptions: options, host: host, traceEnabled: traceEnabled };
@@ -21993,6 +24399,7 @@ var ts;
         }
         return { resolvedTypeReferenceDirective: resolvedTypeReferenceDirective, failedLookupLocations: failedLookupLocations };
         function primaryLookup() {
+            // Check primary library paths
             if (typeRoots && typeRoots.length) {
                 if (traceEnabled) {
                     trace(host, ts.Diagnostics.Resolving_with_primary_search_path_0, typeRoots.join(", "));
@@ -22016,10 +24423,11 @@ var ts;
         function secondaryLookup() {
             var initialLocationForSecondaryLookup = containingFile && ts.getDirectoryPath(containingFile);
             if (initialLocationForSecondaryLookup !== undefined) {
+                // check secondary locations
                 if (traceEnabled) {
                     trace(host, ts.Diagnostics.Looking_up_in_node_modules_folder_initial_location_0, initialLocationForSecondaryLookup);
                 }
-                var result = loadModuleFromNodeModules(Extensions.DtsOnly, typeReferenceDirectiveName, initialLocationForSecondaryLookup, failedLookupLocations, moduleResolutionState, undefined);
+                var result = loadModuleFromNodeModules(Extensions.DtsOnly, typeReferenceDirectiveName, initialLocationForSecondaryLookup, failedLookupLocations, moduleResolutionState, /*cache*/ undefined);
                 var resolvedFile = resolvedTypeScriptOnly(result && result.value);
                 if (!resolvedFile && traceEnabled) {
                     trace(host, ts.Diagnostics.Type_reference_directive_0_was_not_resolved, typeReferenceDirectiveName);
@@ -22034,10 +24442,20 @@ var ts;
         }
     }
     ts.resolveTypeReferenceDirective = resolveTypeReferenceDirective;
+    /**
+     * Given a set of options, returns the set of type directive names
+     *   that should be included for this program automatically.
+     * This list could either come from the config file,
+     *   or from enumerating the types root + initial secondary types lookup location.
+     * More type directives might appear in the program later as a result of loading actual source files;
+     *   this list is only the set of defaults that are implicitly included.
+     */
     function getAutomaticTypeDirectiveNames(options, host) {
+        // Use explicit type list from tsconfig.json
         if (options.types) {
             return options.types;
         }
+        // Walk the primary type lookup locations
         var result = [];
         if (host.directoryExists && host.getDirectories) {
             var typeRoots = getEffectiveTypeRoots(options, host);
@@ -22049,8 +24467,12 @@ var ts;
                             var typeDirectivePath = _b[_a];
                             var normalized = ts.normalizePath(typeDirectivePath);
                             var packageJsonPath = pathToPackageJson(ts.combinePaths(root, normalized));
+                            // `types-publisher` sometimes creates packages with `"typings": null` for packages that don't provide their own types.
+                            // See `createNotNeededPackageJSON` in the types-publisher` repo.
+                            // tslint:disable-next-line:no-null-keyword
                             var isNotNeededPackage = host.fileExists(packageJsonPath) && readJson(packageJsonPath, host).typings === null;
                             if (!isNotNeededPackage) {
+                                // Return just the type directive names
                                 result.push(ts.getBaseFileName(normalized));
                             }
                         }
@@ -22065,6 +24487,7 @@ var ts;
         return createModuleResolutionCacheWithMaps(ts.createMap(), ts.createMap(), currentDirectory, getCanonicalFileName);
     }
     ts.createModuleResolutionCache = createModuleResolutionCache;
+    /*@internal*/
     function createModuleResolutionCacheWithMaps(directoryToModuleNameMap, moduleNameToDirectoryMap, currentDirectory, getCanonicalFileName) {
         return { getOrCreateCacheForDirectory: getOrCreateCacheForDirectory, getOrCreateCacheForModuleName: getOrCreateCacheForModuleName };
         function getOrCreateCacheForDirectory(directoryName) {
@@ -22078,7 +24501,7 @@ var ts;
         }
         function getOrCreateCacheForModuleName(nonRelativeModuleName) {
             if (ts.isExternalModuleNameRelative(nonRelativeModuleName)) {
-                return undefined;
+                return undefined; // TODO: GH#18217
             }
             var perModuleNameCache = moduleNameToDirectoryMap.get(nonRelativeModuleName);
             if (!perModuleNameCache) {
@@ -22093,13 +24516,29 @@ var ts;
             function get(directory) {
                 return directoryPathMap.get(ts.toPath(directory, currentDirectory, getCanonicalFileName));
             }
+            /**
+             * At first this function add entry directory -> module resolution result to the table.
+             * Then it computes the set of parent folders for 'directory' that should have the same module resolution result
+             * and for every parent folder in set it adds entry: parent -> module resolution. .
+             * Lets say we first directory name: /a/b/c/d/e and resolution result is: /a/b/bar.ts.
+             * Set of parent folders that should have the same result will be:
+             * [
+             *     /a/b/c/d, /a/b/c, /a/b
+             * ]
+             * this means that request for module resolution from file in any of these folder will be immediately found in cache.
+             */
             function set(directory, result) {
                 var path = ts.toPath(directory, currentDirectory, getCanonicalFileName);
+                // if entry is already in cache do nothing
                 if (directoryPathMap.has(path)) {
                     return;
                 }
                 directoryPathMap.set(path, result);
                 var resolvedFileName = result.resolvedModule && result.resolvedModule.resolvedFileName;
+                // find common prefix between directory and resolved file name
+                // this common prefix should be the shorted path that has the same resolution
+                // directory: /a/b/c/d/e
+                // resolvedFileName: /a/b/foo.d.ts
                 var commonPrefix = getCommonPrefix(path, resolvedFileName);
                 var current = path;
                 while (true) {
@@ -22119,10 +24558,12 @@ var ts;
                     return undefined;
                 }
                 var resolutionDirectory = ts.toPath(ts.getDirectoryPath(resolution), currentDirectory, getCanonicalFileName);
+                // find first position where directory and resolution differs
                 var i = 0;
                 while (i < Math.min(directory.length, resolutionDirectory.length) && directory.charCodeAt(i) === resolutionDirectory.charCodeAt(i)) {
                     i++;
                 }
+                // find last directory separator before position i
                 var sep = directory.lastIndexOf(ts.directorySeparator, i);
                 if (sep < 0) {
                     return undefined;
@@ -22176,6 +24617,7 @@ var ts;
             }
             if (perFolderCache) {
                 perFolderCache.set(moduleName, result);
+                // put result in per-module name cache
                 var perModuleNameCache = cache.getOrCreateCacheForModuleName(moduleName);
                 if (perModuleNameCache) {
                     perModuleNameCache.set(containingDirectory, result);
@@ -22193,6 +24635,66 @@ var ts;
         return result;
     }
     ts.resolveModuleName = resolveModuleName;
+    /**
+     * Any module resolution kind can be augmented with optional settings: 'baseUrl', 'paths' and 'rootDirs' - they are used to
+     * mitigate differences between design time structure of the project and its runtime counterpart so the same import name
+     * can be resolved successfully by TypeScript compiler and runtime module loader.
+     * If these settings are set then loading procedure will try to use them to resolve module name and it can of failure it will
+     * fallback to standard resolution routine.
+     *
+     * - baseUrl - this setting controls how non-relative module names are resolved. If this setting is specified then non-relative
+     * names will be resolved relative to baseUrl: i.e. if baseUrl is '/a/b' then candidate location to resolve module name 'c/d' will
+     * be '/a/b/c/d'
+     * - paths - this setting can only be used when baseUrl is specified. allows to tune how non-relative module names
+     * will be resolved based on the content of the module name.
+     * Structure of 'paths' compiler options
+     * 'paths': {
+     *    pattern-1: [...substitutions],
+     *    pattern-2: [...substitutions],
+     *    ...
+     *    pattern-n: [...substitutions]
+     * }
+     * Pattern here is a string that can contain zero or one '*' character. During module resolution module name will be matched against
+     * all patterns in the list. Matching for patterns that don't contain '*' means that module name must be equal to pattern respecting the case.
+     * If pattern contains '*' then to match pattern "<prefix>*<suffix>" module name must start with the <prefix> and end with <suffix>.
+     * <MatchedStar> denotes part of the module name between <prefix> and <suffix>.
+     * If module name can be matches with multiple patterns then pattern with the longest prefix will be picked.
+     * After selecting pattern we'll use list of substitutions to get candidate locations of the module and the try to load module
+     * from the candidate location.
+     * Substitution is a string that can contain zero or one '*'. To get candidate location from substitution we'll pick every
+     * substitution in the list and replace '*' with <MatchedStar> string. If candidate location is not rooted it
+     * will be converted to absolute using baseUrl.
+     * For example:
+     * baseUrl: /a/b/c
+     * "paths": {
+     *     // match all module names
+     *     "*": [
+     *         "*",        // use matched name as is,
+     *                     // <matched name> will be looked as /a/b/c/<matched name>
+     *
+     *         "folder1/*" // substitution will convert matched name to 'folder1/<matched name>',
+     *                     // since it is not rooted then final candidate location will be /a/b/c/folder1/<matched name>
+     *     ],
+     *     // match module names that start with 'components/'
+     *     "components/*": [ "/root/components/*" ] // substitution will convert /components/folder1/<matched name> to '/root/components/folder1/<matched name>',
+     *                                              // it is rooted so it will be final candidate location
+     * }
+     *
+     * 'rootDirs' allows the project to be spreaded across multiple locations and resolve modules with relative names as if
+     * they were in the same location. For example lets say there are two files
+     * '/local/src/content/file1.ts'
+     * '/shared/components/contracts/src/content/protocols/file2.ts'
+     * After bundling content of '/shared/components/contracts/src' will be merged with '/local/src' so
+     * if file1 has the following import 'import {x} from "./protocols/file2"' it will be resolved successfully in runtime.
+     * 'rootDirs' provides the way to tell compiler that in order to get the whole project it should behave as if content of all
+     * root dirs were merged together.
+     * I.e. for the example above 'rootDirs' will have two entries: [ '/local/src', '/shared/components/contracts/src' ].
+     * Compiler will first convert './protocols/file2' into absolute path relative to the location of containing file:
+     * '/local/src/content/protocols/file2' and try to load it - failure.
+     * Then it will search 'rootDirs' looking for a longest matching prefix of this absolute path and if such prefix is found - absolute path will
+     * be converted to a path relative to found rootDir entry './content/protocols/file2' (*). As a last step compiler will check all remaining
+     * entries in 'rootDirs', use them to build absolute path out of (*) and try to resolve module from this location.
+     */
     function tryLoadModuleUsingOptionalResolutionSettings(extensions, moduleName, containingDirectory, loader, failedLookupLocations, state) {
         if (!ts.isExternalModuleNameRelative(moduleName)) {
             return tryLoadModuleUsingBaseUrl(extensions, moduleName, loader, failedLookupLocations, state);
@@ -22213,6 +24715,9 @@ var ts;
         var matchedNormalizedPrefix;
         for (var _i = 0, _a = state.compilerOptions.rootDirs; _i < _a.length; _i++) {
             var rootDir = _a[_i];
+            // rootDirs are expected to be absolute
+            // in case of tsconfig.json this will happen automatically - compiler will expand relative names
+            // using location of tsconfig.json as base location
             var normalizedRoot = ts.normalizePath(rootDir);
             if (!ts.endsWith(normalizedRoot, ts.directorySeparator)) {
                 normalizedRoot += ts.directorySeparator;
@@ -22232,6 +24737,7 @@ var ts;
                 trace(state.host, ts.Diagnostics.Longest_matching_prefix_for_0_is_1, candidate, matchedNormalizedPrefix);
             }
             var suffix = candidate.substr(matchedNormalizedPrefix.length);
+            // first - try to load from a initial location
             if (state.traceEnabled) {
                 trace(state.host, ts.Diagnostics.Loading_0_from_the_root_dir_1_candidate_location_2, suffix, matchedNormalizedPrefix, candidate);
             }
@@ -22242,9 +24748,11 @@ var ts;
             if (state.traceEnabled) {
                 trace(state.host, ts.Diagnostics.Trying_other_entries_in_rootDirs);
             }
+            // then try to resolve using remaining entries in rootDirs
             for (var _b = 0, _c = state.compilerOptions.rootDirs; _b < _c.length; _b++) {
                 var rootDir = _c[_b];
                 if (rootDir === matchedRootDir) {
+                    // skip the initially matched entry
                     continue;
                 }
                 var candidate_1 = ts.combinePaths(ts.normalizePath(rootDir), suffix);
@@ -22270,6 +24778,7 @@ var ts;
         if (state.traceEnabled) {
             trace(state.host, ts.Diagnostics.baseUrl_option_is_set_to_0_using_this_value_to_resolve_non_relative_module_name_1, state.compilerOptions.baseUrl, moduleName);
         }
+        // string is for exact match
         var matchedPattern;
         if (state.compilerOptions.paths) {
             if (state.traceEnabled) {
@@ -22289,9 +24798,10 @@ var ts;
                 if (state.traceEnabled) {
                     trace(state.host, ts.Diagnostics.Trying_substitution_0_candidate_module_location_Colon_1, subst, path);
                 }
+                // A path mapping may have an extension, in contrast to an import, which should omit it.
                 var extension = ts.tryGetExtensionFromPath(candidate);
                 if (extension !== undefined) {
-                    var path_1 = tryFile(candidate, failedLookupLocations, false, state);
+                    var path_1 = tryFile(candidate, failedLookupLocations, /*onlyRecordFailures*/ false, state);
                     if (path_1 !== undefined) {
                         return noPackageId({ path: path_1, ext: extension });
                     }
@@ -22308,11 +24818,17 @@ var ts;
         }
     }
     function nodeModuleNameResolver(moduleName, containingFile, compilerOptions, host, cache) {
-        return nodeModuleNameResolverWorker(moduleName, ts.getDirectoryPath(containingFile), compilerOptions, host, cache, false);
+        return nodeModuleNameResolverWorker(moduleName, ts.getDirectoryPath(containingFile), compilerOptions, host, cache, /*jsOnly*/ false);
     }
     ts.nodeModuleNameResolver = nodeModuleNameResolver;
+    /**
+     * Expose resolution logic to allow us to use Node module resolution logic from arbitrary locations.
+     * No way to do this with `require()`: https://github.com/nodejs/node/issues/5963
+     * Throws an error if the module can't be resolved.
+     */
+    /* @internal */
     function resolveJavaScriptModule(moduleName, initialDir, host) {
-        var _a = nodeModuleNameResolverWorker(moduleName, initialDir, { moduleResolution: ts.ModuleResolutionKind.NodeJs, allowJs: true }, host, undefined, true), resolvedModule = _a.resolvedModule, failedLookupLocations = _a.failedLookupLocations;
+        var _a = nodeModuleNameResolverWorker(moduleName, initialDir, { moduleResolution: ts.ModuleResolutionKind.NodeJs, allowJs: true }, host, /*cache*/ undefined, /*jsOnly*/ true), resolvedModule = _a.resolvedModule, failedLookupLocations = _a.failedLookupLocations;
         if (!resolvedModule) {
             throw new Error("Could not resolve JS module '" + moduleName + "' starting at '" + initialDir + "'. Looked in: " + failedLookupLocations.join(", "));
         }
@@ -22334,7 +24850,7 @@ var ts;
         }
         return { resolvedModule: undefined, failedLookupLocations: failedLookupLocations };
         function tryResolve(extensions) {
-            var loader = function (extensions, candidate, failedLookupLocations, onlyRecordFailures, state) { return nodeLoadModuleByRelativeName(extensions, candidate, failedLookupLocations, onlyRecordFailures, state, true); };
+            var loader = function (extensions, candidate, failedLookupLocations, onlyRecordFailures, state) { return nodeLoadModuleByRelativeName(extensions, candidate, failedLookupLocations, onlyRecordFailures, state, /*considerPackageJson*/ true); };
             var resolved = tryLoadModuleUsingOptionalResolutionSettings(extensions, moduleName, containingDirectory, loader, failedLookupLocations, state);
             if (resolved) {
                 return toSearchResult({ resolved: resolved, isExternalLibraryImport: false });
@@ -22356,11 +24872,13 @@ var ts;
                     }
                     resolvedValue = __assign({}, resolvedValue, { path: path });
                 }
+                // For node_modules lookups, get the real path so that multiple accesses to an `npm link`-ed module do not create duplicate files.
                 return { value: resolvedValue && { resolved: resolvedValue, originalPath: originalPath, isExternalLibraryImport: true } };
             }
             else {
                 var _a = ts.normalizePathAndParts(ts.combinePaths(containingDirectory, moduleName)), candidate = _a.path, parts = _a.parts;
-                var resolved_2 = nodeLoadModuleByRelativeName(extensions, candidate, failedLookupLocations, false, state, true);
+                var resolved_2 = nodeLoadModuleByRelativeName(extensions, candidate, failedLookupLocations, /*onlyRecordFailures*/ false, state, /*considerPackageJson*/ true);
+                // Treat explicit "node_modules" import as an external library import.
                 return resolved_2 && toSearchResult({ resolved: resolved_2, isExternalLibraryImport: ts.contains(parts, "node_modules") });
             }
         }
@@ -22373,7 +24891,7 @@ var ts;
         if (traceEnabled) {
             trace(host, ts.Diagnostics.Resolving_real_path_for_0_result_1, path, real);
         }
-        ts.Debug.assert(host.fileExists(real), path + " linked to nonexistent file " + real);
+        ts.Debug.assert(host.fileExists(real), path + " linked to nonexistent file " + real); // tslint:disable-line
         return real;
     }
     function nodeLoadModuleByRelativeName(extensions, candidate, failedLookupLocations, onlyRecordFailures, state, considerPackageJson) {
@@ -22393,7 +24911,7 @@ var ts;
             var resolvedFromFile = loadModuleFromFile(extensions, candidate, failedLookupLocations, onlyRecordFailures, state);
             if (resolvedFromFile) {
                 var nm = considerPackageJson ? parseNodeModuleFromPath(resolvedFromFile) : undefined;
-                var packageId = nm && getPackageJsonInfo(nm.packageDirectory, nm.subModuleName, failedLookupLocations, false, state).packageId;
+                var packageId = nm && getPackageJsonInfo(nm.packageDirectory, nm.subModuleName, failedLookupLocations, /*onlyRecordFailures*/ false, state).packageId;
                 return withPackageId(packageId, resolvedFromFile);
             }
         }
@@ -22409,6 +24927,17 @@ var ts;
         return loadNodeModuleFromDirectory(extensions, candidate, failedLookupLocations, onlyRecordFailures, state, considerPackageJson);
     }
     var nodeModulesPathPart = "/node_modules/";
+    /**
+     * This will be called on the successfully resolved path from `loadModuleFromFile`.
+     * (Not neeeded for `loadModuleFromNodeModules` as that looks up the `package.json` as part of resolution.)
+     *
+     * packageDirectory is the directory of the package itself.
+     * subModuleName is the path within the package.
+     *   For `blah/node_modules/foo/index.d.ts` this is { packageDirectory: "foo", subModuleName: "index.d.ts" }. (Part before "/node_modules/" is ignored.)
+     *   For `/node_modules/foo/bar.d.ts` this is { packageDirectory: "foo", subModuleName": "bar/index.d.ts" }.
+     *   For `/node_modules/@types/foo/bar/index.d.ts` this is { packageDirectory: "@types/foo", subModuleName: "bar/index.d.ts" }.
+     *   For `/node_modules/foo/bar/index.d.ts` this is { packageDirectory: "foo", subModuleName": "bar/index.d.ts" }.
+     */
     function parseNodeModuleFromPath(resolved) {
         var path = ts.normalizePath(resolved.path);
         var idx = path.lastIndexOf(nodeModulesPathPart);
@@ -22417,11 +24946,11 @@ var ts;
         }
         var indexAfterNodeModules = idx + nodeModulesPathPart.length;
         var indexAfterPackageName = moveToNextDirectorySeparatorIfAvailable(path, indexAfterNodeModules);
-        if (path.charCodeAt(indexAfterNodeModules) === 64) {
+        if (path.charCodeAt(indexAfterNodeModules) === 64 /* at */) {
             indexAfterPackageName = moveToNextDirectorySeparatorIfAvailable(path, indexAfterPackageName);
         }
         var packageDirectory = path.slice(0, indexAfterPackageName);
-        var subModuleName = ts.removeExtension(path.slice(indexAfterPackageName + 1), resolved.ext) + ".d.ts";
+        var subModuleName = ts.removeExtension(path.slice(indexAfterPackageName + 1), resolved.ext) + ".d.ts" /* Dts */;
         return { packageDirectory: packageDirectory, subModuleName: subModuleName };
     }
     function moveToNextDirectorySeparatorIfAvailable(path, prevSeparatorIndex) {
@@ -22440,22 +24969,31 @@ var ts;
         }
         return path + "/index.d.ts";
     }
+    /* @internal */
     function directoryProbablyExists(directoryName, host) {
+        // if host does not support 'directoryExists' assume that directory will exist
         return !host.directoryExists || host.directoryExists(directoryName);
     }
     ts.directoryProbablyExists = directoryProbablyExists;
     function loadModuleFromFileNoPackageId(extensions, candidate, failedLookupLocations, onlyRecordFailures, state) {
         return noPackageId(loadModuleFromFile(extensions, candidate, failedLookupLocations, onlyRecordFailures, state));
     }
+    /**
+     * @param {boolean} onlyRecordFailures - if true then function won't try to actually load files but instead record all attempts as failures. This flag is necessary
+     * in cases when we know upfront that all load attempts will fail (because containing folder does not exists) however we still need to record all failed lookup locations.
+     */
     function loadModuleFromFile(extensions, candidate, failedLookupLocations, onlyRecordFailures, state) {
         if (extensions === Extensions.Json) {
-            var extensionLess = ts.tryRemoveExtension(candidate, ".json");
+            var extensionLess = ts.tryRemoveExtension(candidate, ".json" /* Json */);
             return extensionLess === undefined ? undefined : tryAddingExtensions(extensionLess, extensions, failedLookupLocations, onlyRecordFailures, state);
         }
+        // First, try adding an extension. An import of "foo" could be matched by a file "foo.ts", or "foo.js" by "foo.js.ts"
         var resolvedByAddingExtension = tryAddingExtensions(candidate, extensions, failedLookupLocations, onlyRecordFailures, state);
         if (resolvedByAddingExtension) {
             return resolvedByAddingExtension;
         }
+        // If that didn't work, try stripping a ".js" or ".jsx" extension and replacing it with a TypeScript one;
+        // e.g. "./foo.js" can be matched by "./foo.ts" or "./foo.d.ts"
         if (ts.hasJavaScriptFileExtension(candidate)) {
             var extensionless = ts.removeFileExtension(candidate);
             if (state.traceEnabled) {
@@ -22465,8 +25003,10 @@ var ts;
             return tryAddingExtensions(extensionless, extensions, failedLookupLocations, onlyRecordFailures, state);
         }
     }
+    /** Try to return an existing file that adds one of the `extensions` to `candidate`. */
     function tryAddingExtensions(candidate, extensions, failedLookupLocations, onlyRecordFailures, state) {
         if (!onlyRecordFailures) {
+            // check if containing folder exists - if it doesn't then just record failures for all supported extensions without disk probing
             var directory = ts.getDirectoryPath(candidate);
             if (directory) {
                 onlyRecordFailures = !directoryProbablyExists(directory, state.host);
@@ -22474,19 +25014,20 @@ var ts;
         }
         switch (extensions) {
             case Extensions.DtsOnly:
-                return tryExtension(".d.ts");
+                return tryExtension(".d.ts" /* Dts */);
             case Extensions.TypeScript:
-                return tryExtension(".ts") || tryExtension(".tsx") || tryExtension(".d.ts");
+                return tryExtension(".ts" /* Ts */) || tryExtension(".tsx" /* Tsx */) || tryExtension(".d.ts" /* Dts */);
             case Extensions.JavaScript:
-                return tryExtension(".js") || tryExtension(".jsx");
+                return tryExtension(".js" /* Js */) || tryExtension(".jsx" /* Jsx */);
             case Extensions.Json:
-                return tryExtension(".json");
+                return tryExtension(".json" /* Json */);
         }
         function tryExtension(ext) {
             var path = tryFile(candidate + ext, failedLookupLocations, onlyRecordFailures, state);
             return path === undefined ? undefined : { path: path, ext: ext };
         }
     }
+    /** Return the file if it exists. */
     function tryFile(fileName, failedLookupLocations, onlyRecordFailures, state) {
         if (!onlyRecordFailures) {
             if (state.host.fileExists(fileName)) {
@@ -22525,25 +25066,25 @@ var ts;
         var packageJsonPath = pathToPackageJson(nodeModuleDirectory);
         if (directoryExists && host.fileExists(packageJsonPath)) {
             var packageJsonContent = readJson(packageJsonPath, host);
-            if (subModuleName === "") {
-                var path = tryReadPackageJsonFields(true, packageJsonContent, nodeModuleDirectory, state);
+            if (subModuleName === "") { // looking up the root - need to handle types/typings/main redirects for subModuleName
+                var path = tryReadPackageJsonFields(/*readTypes*/ true, packageJsonContent, nodeModuleDirectory, state);
                 if (typeof path === "string") {
                     subModuleName = addExtensionAndIndex(path.substring(nodeModuleDirectory.length + 1));
                 }
                 else {
-                    var jsPath = tryReadPackageJsonFields(false, packageJsonContent, nodeModuleDirectory, state);
+                    var jsPath = tryReadPackageJsonFields(/*readTypes*/ false, packageJsonContent, nodeModuleDirectory, state);
                     if (typeof jsPath === "string" && jsPath.length > nodeModuleDirectory.length) {
                         var potentialSubModule_1 = jsPath.substring(nodeModuleDirectory.length + 1);
                         subModuleName = (ts.forEach(ts.supportedJavascriptExtensions, function (extension) {
                             return ts.tryRemoveExtension(potentialSubModule_1, extension);
-                        }) || potentialSubModule_1) + ".d.ts";
+                        }) || potentialSubModule_1) + ".d.ts" /* Dts */;
                     }
                     else {
                         subModuleName = "index.d.ts";
                     }
                 }
             }
-            if (!ts.endsWith(subModuleName, ".d.ts")) {
+            if (!ts.endsWith(subModuleName, ".d.ts" /* Dts */)) {
                 subModuleName = addExtensionAndIndex(subModuleName);
             }
             var packageId = typeof packageJsonContent.name === "string" && typeof packageJsonContent.version === "string"
@@ -22563,6 +25104,7 @@ var ts;
             if (directoryExists && traceEnabled) {
                 trace(host, ts.Diagnostics.File_0_does_not_exist, packageJsonPath);
             }
+            // record package json as one of failed lookup locations - in the future if this file will appear it will invalidate resolution results
             failedLookupLocations.push(packageJsonPath);
             return { found: false, packageJsonContent: undefined, packageId: undefined };
         }
@@ -22571,7 +25113,8 @@ var ts;
         var file = tryReadPackageJsonFields(extensions !== Extensions.JavaScript && extensions !== Extensions.Json, jsonContent, candidate, state);
         if (!file) {
             if (extensions === Extensions.TypeScript) {
-                file = tryReadPackageJsonFields(false, jsonContent, candidate, state);
+                // When resolving typescript modules, try resolving using main field as well
+                file = tryReadPackageJsonFields(/*readTypes*/ false, jsonContent, candidate, state);
                 if (!file) {
                     return undefined;
                 }
@@ -22591,27 +25134,32 @@ var ts;
                 trace(state.host, ts.Diagnostics.File_0_has_an_unsupported_extension_so_skipping_it, fromFile);
             }
         }
+        // Even if extensions is DtsOnly, we can still look up a .ts file as a result of package.json "types"
         var nextExtensions = extensions === Extensions.DtsOnly ? Extensions.TypeScript : extensions;
-        var result = nodeLoadModuleByRelativeName(nextExtensions, file, failedLookupLocations, onlyRecordFailures, state, false);
+        // Don't do package.json lookup recursively, because Node.js' package lookup doesn't.
+        var result = nodeLoadModuleByRelativeName(nextExtensions, file, failedLookupLocations, onlyRecordFailures, state, /*considerPackageJson*/ false);
         if (result) {
+            // It won't have a `packageId` set, because we disabled `considerPackageJson`.
             ts.Debug.assert(result.packageId === undefined);
             return { path: result.path, ext: result.extension };
         }
     }
+    /** Resolve from an arbitrarily specified file. Return `undefined` if it has an unsupported extension. */
     function resolvedIfExtensionMatches(extensions, path) {
         var ext = ts.tryGetExtensionFromPath(path);
         return ext !== undefined && extensionIsOk(extensions, ext) ? { path: path, ext: ext } : undefined;
     }
+    /** True if `extension` is one of the supported `extensions`. */
     function extensionIsOk(extensions, extension) {
         switch (extensions) {
             case Extensions.JavaScript:
-                return extension === ".js" || extension === ".jsx";
+                return extension === ".js" /* Js */ || extension === ".jsx" /* Jsx */;
             case Extensions.Json:
-                return extension === ".json";
+                return extension === ".json" /* Json */;
             case Extensions.TypeScript:
-                return extension === ".ts" || extension === ".tsx" || extension === ".d.ts";
+                return extension === ".ts" /* Ts */ || extension === ".tsx" /* Tsx */ || extension === ".d.ts" /* Dts */;
             case Extensions.DtsOnly:
-                return extension === ".d.ts";
+                return extension === ".d.ts" /* Dts */;
         }
     }
     function pathToPackageJson(directory) {
@@ -22619,16 +25167,18 @@ var ts;
     }
     function loadModuleFromNodeModulesFolder(extensions, moduleName, nodeModulesFolder, nodeModulesFolderExists, failedLookupLocations, state) {
         var candidate = ts.normalizePath(ts.combinePaths(nodeModulesFolder, moduleName));
+        // First look for a nested package.json, as in `node_modules/foo/bar/package.json`.
         var packageJsonContent;
         var packageId;
-        var packageInfo = getPackageJsonInfo(candidate, "", failedLookupLocations, !nodeModulesFolderExists, state);
+        var packageInfo = getPackageJsonInfo(candidate, "", failedLookupLocations, /*onlyRecordFailures*/ !nodeModulesFolderExists, state);
         if (packageInfo.found) {
             (packageJsonContent = packageInfo.packageJsonContent, packageId = packageInfo.packageId);
         }
         else {
             var _a = getPackageName(moduleName), packageName = _a.packageName, rest = _a.rest;
-            if (rest !== "") {
+            if (rest !== "") { // If "rest" is empty, we just did this search above.
                 var packageRootPath = ts.combinePaths(nodeModulesFolder, packageName);
+                // Don't use a "types" or "main" from here because we're not loading the root, but a subdirectory -- just here for the packageId.
                 packageId = getPackageJsonInfo(packageRootPath, rest, failedLookupLocations, !nodeModulesFolderExists, state).packageId;
             }
         }
@@ -22636,6 +25186,7 @@ var ts;
             loadNodeModuleFromDirectoryWorker(extensions, candidate, failedLookupLocations, !nodeModulesFolderExists, state, packageJsonContent);
         return withPackageId(packageId, pathAndExtension);
     }
+    /* @internal */
     function getPackageName(moduleName) {
         var idx = moduleName.indexOf(ts.directorySeparator);
         if (moduleName[0] === "@") {
@@ -22645,10 +25196,11 @@ var ts;
     }
     ts.getPackageName = getPackageName;
     function loadModuleFromNodeModules(extensions, moduleName, directory, failedLookupLocations, state, cache) {
-        return loadModuleFromNodeModulesWorker(extensions, moduleName, directory, failedLookupLocations, state, false, cache);
+        return loadModuleFromNodeModulesWorker(extensions, moduleName, directory, failedLookupLocations, state, /*typesOnly*/ false, cache);
     }
     function loadModuleFromNodeModulesAtTypes(moduleName, directory, failedLookupLocations, state) {
-        return loadModuleFromNodeModulesWorker(Extensions.DtsOnly, moduleName, directory, failedLookupLocations, state, true, undefined);
+        // Extensions parameter here doesn't actually matter, because typesOnly ensures we're just doing @types lookup, which is always DtsOnly.
+        return loadModuleFromNodeModulesWorker(Extensions.DtsOnly, moduleName, directory, failedLookupLocations, state, /*typesOnly*/ true, /*cache*/ undefined);
     }
     function loadModuleFromNodeModulesWorker(extensions, moduleName, directory, failedLookupLocations, state, typesOnly, cache) {
         var perModuleNameCache = cache && cache.getOrCreateCacheForModuleName(moduleName);
@@ -22662,6 +25214,7 @@ var ts;
             }
         });
     }
+    /** Load a module from a single node_modules directory, but not from any ancestors' node_modules directories. */
     function loadModuleFromNodeModulesOneLevel(extensions, moduleName, directory, failedLookupLocations, state, typesOnly) {
         if (typesOnly === void 0) { typesOnly = false; }
         var nodeModulesFolder = ts.combinePaths(directory, "node_modules");
@@ -22685,7 +25238,9 @@ var ts;
             return loadModuleFromNodeModulesFolder(Extensions.DtsOnly, mangleScopedPackage(moduleName, state), nodeModulesAtTypes_1, nodeModulesAtTypesExists, failedLookupLocations, state);
         }
     }
+    /** Double underscores are used in DefinitelyTyped to delimit scoped packages. */
     var mangledScopedPackageSeparator = "__";
+    /** For a scoped package, we must look in `@types/foo__bar` instead of `@types/@foo/bar`. */
     function mangleScopedPackage(packageName, state) {
         var mangled = getMangledNameForScopedPackage(packageName);
         if (state.traceEnabled && mangled !== packageName) {
@@ -22693,20 +25248,23 @@ var ts;
         }
         return mangled;
     }
+    /* @internal */
     function getTypesPackageName(packageName) {
         return "@types/" + getMangledNameForScopedPackage(packageName);
     }
     ts.getTypesPackageName = getTypesPackageName;
+    /* @internal */
     function getMangledNameForScopedPackage(packageName) {
         if (ts.startsWith(packageName, "@")) {
             var replaceSlash = packageName.replace(ts.directorySeparator, mangledScopedPackageSeparator);
             if (replaceSlash !== packageName) {
-                return replaceSlash.slice(1);
+                return replaceSlash.slice(1); // Take off the "@"
             }
         }
         return packageName;
     }
     ts.getMangledNameForScopedPackage = getMangledNameForScopedPackage;
+    /* @internal */
     function getPackageNameFromAtTypesDirectory(mangledName) {
         var withoutAtTypePrefix = ts.removePrefix(mangledName, "@types/");
         if (withoutAtTypePrefix !== mangledName) {
@@ -22715,6 +25273,7 @@ var ts;
         return mangledName;
     }
     ts.getPackageNameFromAtTypesDirectory = getPackageNameFromAtTypesDirectory;
+    /* @internal */
     function getUnmangledNameForScopedPackage(typesPackageName) {
         return ts.stringContains(typesPackageName, mangledScopedPackageSeparator) ?
             "@" + typesPackageName.replace(mangledScopedPackageSeparator, ts.directorySeparator) :
@@ -22737,7 +25296,8 @@ var ts;
         var failedLookupLocations = [];
         var containingDirectory = ts.getDirectoryPath(containingFile);
         var resolved = tryResolve(Extensions.TypeScript) || tryResolve(Extensions.JavaScript);
-        return createResolvedModuleWithFailedLookupLocations(resolved && resolved.value, undefined, false, failedLookupLocations);
+        // No originalPath because classic resolution doesn't resolve realPath
+        return createResolvedModuleWithFailedLookupLocations(resolved && resolved.value, /*originalPath*/ undefined, /*isExternalLibraryImport*/ false, failedLookupLocations);
         function tryResolve(extensions) {
             var resolvedUsingSettings = tryLoadModuleUsingOptionalResolutionSettings(extensions, moduleName, containingDirectory, loadModuleFromFileNoPackageId, failedLookupLocations, state);
             if (resolvedUsingSettings) {
@@ -22745,28 +25305,35 @@ var ts;
             }
             var perModuleNameCache = cache && cache.getOrCreateCacheForModuleName(moduleName);
             if (!ts.isExternalModuleNameRelative(moduleName)) {
+                // Climb up parent directories looking for a module.
                 var resolved_3 = ts.forEachAncestorDirectory(containingDirectory, function (directory) {
                     var resolutionFromCache = tryFindNonRelativeModuleNameInCache(perModuleNameCache, moduleName, directory, traceEnabled, host, failedLookupLocations);
                     if (resolutionFromCache) {
                         return resolutionFromCache;
                     }
                     var searchName = ts.normalizePath(ts.combinePaths(directory, moduleName));
-                    return toSearchResult(loadModuleFromFileNoPackageId(extensions, searchName, failedLookupLocations, false, state));
+                    return toSearchResult(loadModuleFromFileNoPackageId(extensions, searchName, failedLookupLocations, /*onlyRecordFailures*/ false, state));
                 });
                 if (resolved_3) {
                     return resolved_3;
                 }
                 if (extensions === Extensions.TypeScript) {
+                    // If we didn't find the file normally, look it up in @types.
                     return loadModuleFromNodeModulesAtTypes(moduleName, containingDirectory, failedLookupLocations, state);
                 }
             }
             else {
                 var candidate = ts.normalizePath(ts.combinePaths(containingDirectory, moduleName));
-                return toSearchResult(loadModuleFromFileNoPackageId(extensions, candidate, failedLookupLocations, false, state));
+                return toSearchResult(loadModuleFromFileNoPackageId(extensions, candidate, failedLookupLocations, /*onlyRecordFailures*/ false, state));
             }
         }
     }
     ts.classicNameResolver = classicNameResolver;
+    /**
+     * LSHost may load a module from a global cache of typings.
+     * This is the minumum code needed to expose that functionality; the rest is in LSHost.
+     */
+    /* @internal */
     function loadModuleFromGlobalCache(moduleName, projectName, compilerOptions, host, globalCache) {
         var traceEnabled = isTraceEnabled(compilerOptions, host);
         if (traceEnabled) {
@@ -22775,13 +25342,3618 @@ var ts;
         var state = { compilerOptions: compilerOptions, host: host, traceEnabled: traceEnabled };
         var failedLookupLocations = [];
         var resolved = loadModuleFromNodeModulesOneLevel(Extensions.DtsOnly, moduleName, globalCache, failedLookupLocations, state);
-        return createResolvedModuleWithFailedLookupLocations(resolved, undefined, true, failedLookupLocations);
+        return createResolvedModuleWithFailedLookupLocations(resolved, /*originalPath*/ undefined, /*isExternalLibraryImport*/ true, failedLookupLocations);
     }
     ts.loadModuleFromGlobalCache = loadModuleFromGlobalCache;
+    /**
+     * Wraps value to SearchResult.
+     * @returns undefined if value is undefined or { value } otherwise
+     */
     function toSearchResult(value) {
         return value !== undefined ? { value: value } : undefined;
     }
 })(ts || (ts = {}));
+//# sourceMappingURL=parser.js.map
+"use strict";
+var __assign = (this && this.__assign) || Object.assign || function(t) {
+    for (var s, i = 1, n = arguments.length; i < n; i++) {
+        s = arguments[i];
+        for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
+            t[p] = s[p];
+    }
+    return t;
+};
+var __makeTemplateObject = (this && this.__makeTemplateObject) || function (cooked, raw) {
+    if (Object.defineProperty) { Object.defineProperty(cooked, "raw", { value: raw }); } else { cooked.raw = raw; }
+    return cooked;
+};
+/* @internal */
+var ts;
+(function (ts) {
+    var ModuleInstanceState;
+    (function (ModuleInstanceState) {
+        ModuleInstanceState[ModuleInstanceState["NonInstantiated"] = 0] = "NonInstantiated";
+        ModuleInstanceState[ModuleInstanceState["Instantiated"] = 1] = "Instantiated";
+        ModuleInstanceState[ModuleInstanceState["ConstEnumOnly"] = 2] = "ConstEnumOnly";
+    })(ModuleInstanceState = ts.ModuleInstanceState || (ts.ModuleInstanceState = {}));
+    function getModuleInstanceState(node) {
+        return node.body ? getModuleInstanceStateWorker(node.body) : 1 /* Instantiated */;
+    }
+    ts.getModuleInstanceState = getModuleInstanceState;
+    function getModuleInstanceStateWorker(node) {
+        // A module is uninstantiated if it contains only
+        switch (node.kind) {
+            // 1. interface declarations, type alias declarations
+            case 236 /* InterfaceDeclaration */:
+            case 237 /* TypeAliasDeclaration */:
+                return 0 /* NonInstantiated */;
+            // 2. const enum declarations
+            case 238 /* EnumDeclaration */:
+                if (ts.isConst(node)) {
+                    return 2 /* ConstEnumOnly */;
+                }
+                break;
+            // 3. non-exported import declarations
+            case 244 /* ImportDeclaration */:
+            case 243 /* ImportEqualsDeclaration */:
+                if (!(ts.hasModifier(node, 1 /* Export */))) {
+                    return 0 /* NonInstantiated */;
+                }
+                break;
+            // 4. other uninstantiated module declarations.
+            case 240 /* ModuleBlock */: {
+                var state_1 = 0 /* NonInstantiated */;
+                ts.forEachChild(node, function (n) {
+                    var childState = getModuleInstanceStateWorker(n);
+                    switch (childState) {
+                        case 0 /* NonInstantiated */:
+                            // child is non-instantiated - continue searching
+                            return;
+                        case 2 /* ConstEnumOnly */:
+                            // child is const enum only - record state and continue searching
+                            state_1 = 2 /* ConstEnumOnly */;
+                            return;
+                        case 1 /* Instantiated */:
+                            // child is instantiated - record state and stop
+                            state_1 = 1 /* Instantiated */;
+                            return true;
+                        default:
+                            ts.Debug.assertNever(childState);
+                    }
+                });
+                return state_1;
+            }
+            case 239 /* ModuleDeclaration */:
+                return getModuleInstanceState(node);
+            case 71 /* Identifier */:
+                // Only jsdoc typedef definition can exist in jsdoc namespace, and it should
+                // be considered the same as type alias
+                if (node.isInJSDocNamespace) {
+                    return 0 /* NonInstantiated */;
+                }
+        }
+        return 1 /* Instantiated */;
+    }
+    var ContainerFlags;
+    (function (ContainerFlags) {
+        // The current node is not a container, and no container manipulation should happen before
+        // recursing into it.
+        ContainerFlags[ContainerFlags["None"] = 0] = "None";
+        // The current node is a container.  It should be set as the current container (and block-
+        // container) before recursing into it.  The current node does not have locals.  Examples:
+        //
+        //      Classes, ObjectLiterals, TypeLiterals, Interfaces...
+        ContainerFlags[ContainerFlags["IsContainer"] = 1] = "IsContainer";
+        // The current node is a block-scoped-container.  It should be set as the current block-
+        // container before recursing into it.  Examples:
+        //
+        //      Blocks (when not parented by functions), Catch clauses, For/For-in/For-of statements...
+        ContainerFlags[ContainerFlags["IsBlockScopedContainer"] = 2] = "IsBlockScopedContainer";
+        // The current node is the container of a control flow path. The current control flow should
+        // be saved and restored, and a new control flow initialized within the container.
+        ContainerFlags[ContainerFlags["IsControlFlowContainer"] = 4] = "IsControlFlowContainer";
+        ContainerFlags[ContainerFlags["IsFunctionLike"] = 8] = "IsFunctionLike";
+        ContainerFlags[ContainerFlags["IsFunctionExpression"] = 16] = "IsFunctionExpression";
+        ContainerFlags[ContainerFlags["HasLocals"] = 32] = "HasLocals";
+        ContainerFlags[ContainerFlags["IsInterface"] = 64] = "IsInterface";
+        ContainerFlags[ContainerFlags["IsObjectLiteralOrClassExpressionMethod"] = 128] = "IsObjectLiteralOrClassExpressionMethod";
+    })(ContainerFlags || (ContainerFlags = {}));
+    var binder = createBinder();
+    function bindSourceFile(file, options) {
+        ts.performance.mark("beforeBind");
+        binder(file, options);
+        ts.performance.mark("afterBind");
+        ts.performance.measure("Bind", "beforeBind", "afterBind");
+    }
+    ts.bindSourceFile = bindSourceFile;
+    function createBinder() {
+        var file;
+        var options;
+        var languageVersion;
+        var parent;
+        var container;
+        var thisParentContainer; // Container one level up
+        var blockScopeContainer;
+        var lastContainer;
+        var delayedTypeAliases;
+        var seenThisKeyword;
+        // state used by control flow analysis
+        var currentFlow;
+        var currentBreakTarget;
+        var currentContinueTarget;
+        var currentReturnTarget;
+        var currentTrueTarget;
+        var currentFalseTarget;
+        var preSwitchCaseFlow;
+        var activeLabels;
+        var hasExplicitReturn;
+        // state used for emit helpers
+        var emitFlags;
+        // If this file is an external module, then it is automatically in strict-mode according to
+        // ES6.  If it is not an external module, then we'll determine if it is in strict mode or
+        // not depending on if we see "use strict" in certain places or if we hit a class/namespace
+        // or if compiler options contain alwaysStrict.
+        var inStrictMode;
+        var symbolCount = 0;
+        var Symbol; // tslint:disable-line variable-name
+        var classifiableNames;
+        var unreachableFlow = { flags: 1 /* Unreachable */ };
+        var reportedUnreachableFlow = { flags: 1 /* Unreachable */ };
+        // state used to aggregate transform flags during bind.
+        var subtreeTransformFlags = 0 /* None */;
+        var skipTransformFlagAggregation;
+        /**
+         * Inside the binder, we may create a diagnostic for an as-yet unbound node (with potentially no parent pointers, implying no accessible source file)
+         * If so, the node _must_ be in the current file (as that's the only way anything could have traversed to it to yield it as the error node)
+         * This version of `createDiagnosticForNode` uses the binder's context to account for this, and always yields correct diagnostics even in these situations.
+         */
+        function createDiagnosticForNode(node, message, arg0, arg1, arg2) {
+            return ts.createDiagnosticForNodeInSourceFile(ts.getSourceFileOfNode(node) || file, node, message, arg0, arg1, arg2);
+        }
+        function bindSourceFile(f, opts) {
+            file = f;
+            options = opts;
+            languageVersion = ts.getEmitScriptTarget(options);
+            inStrictMode = bindInStrictMode(file, opts);
+            classifiableNames = ts.createUnderscoreEscapedMap();
+            symbolCount = 0;
+            skipTransformFlagAggregation = file.isDeclarationFile;
+            Symbol = ts.objectAllocator.getSymbolConstructor();
+            if (!file.locals) {
+                bind(file);
+                file.symbolCount = symbolCount;
+                file.classifiableNames = classifiableNames;
+                delayedBindJSDocTypedefTag();
+            }
+            file = undefined;
+            options = undefined;
+            languageVersion = undefined;
+            parent = undefined;
+            container = undefined;
+            thisParentContainer = undefined;
+            blockScopeContainer = undefined;
+            lastContainer = undefined;
+            delayedTypeAliases = undefined;
+            seenThisKeyword = false;
+            currentFlow = undefined;
+            currentBreakTarget = undefined;
+            currentContinueTarget = undefined;
+            currentReturnTarget = undefined;
+            currentTrueTarget = undefined;
+            currentFalseTarget = undefined;
+            activeLabels = undefined;
+            hasExplicitReturn = false;
+            emitFlags = 0 /* None */;
+            subtreeTransformFlags = 0 /* None */;
+        }
+        return bindSourceFile;
+        function bindInStrictMode(file, opts) {
+            if (ts.getStrictOptionValue(opts, "alwaysStrict") && !file.isDeclarationFile) {
+                // bind in strict mode source files with alwaysStrict option
+                return true;
+            }
+            else {
+                return !!file.externalModuleIndicator;
+            }
+        }
+        function createSymbol(flags, name) {
+            symbolCount++;
+            return new Symbol(flags, name);
+        }
+        function addDeclarationToSymbol(symbol, node, symbolFlags) {
+            symbol.flags |= symbolFlags;
+            node.symbol = symbol;
+            symbol.declarations = ts.append(symbol.declarations, node);
+            if (symbolFlags & 1952 /* HasExports */ && !symbol.exports) {
+                symbol.exports = ts.createSymbolTable();
+            }
+            if (symbolFlags & 6240 /* HasMembers */ && !symbol.members) {
+                symbol.members = ts.createSymbolTable();
+            }
+            if (symbolFlags & 67216319 /* Value */) {
+                var valueDeclaration = symbol.valueDeclaration;
+                if (!valueDeclaration ||
+                    (valueDeclaration.kind !== node.kind && ts.isEffectiveModuleDeclaration(valueDeclaration))) {
+                    // other kinds of value declarations take precedence over modules
+                    symbol.valueDeclaration = node;
+                }
+            }
+        }
+        // Should not be called on a declaration with a computed property name,
+        // unless it is a well known Symbol.
+        function getDeclarationName(node) {
+            if (node.kind === 249 /* ExportAssignment */) {
+                return node.isExportEquals ? "export=" /* ExportEquals */ : "default" /* Default */;
+            }
+            var name = ts.getNameOfDeclaration(node);
+            if (name) {
+                if (ts.isAmbientModule(node)) {
+                    var moduleName = ts.getTextOfIdentifierOrLiteral(name);
+                    return (ts.isGlobalScopeAugmentation(node) ? "__global" : "\"" + moduleName + "\"");
+                }
+                if (name.kind === 147 /* ComputedPropertyName */) {
+                    var nameExpression = name.expression;
+                    // treat computed property names where expression is string/numeric literal as just string/numeric literal
+                    if (ts.isStringOrNumericLiteral(nameExpression)) {
+                        return ts.escapeLeadingUnderscores(nameExpression.text);
+                    }
+                    ts.Debug.assert(ts.isWellKnownSymbolSyntactically(nameExpression));
+                    return ts.getPropertyNameForKnownSymbolName(ts.idText(nameExpression.name));
+                }
+                return ts.isPropertyNameLiteral(name) ? ts.getEscapedTextOfIdentifierOrLiteral(name) : undefined;
+            }
+            switch (node.kind) {
+                case 155 /* Constructor */:
+                    return "__constructor" /* Constructor */;
+                case 163 /* FunctionType */:
+                case 158 /* CallSignature */:
+                case 288 /* JSDocSignature */:
+                    return "__call" /* Call */;
+                case 164 /* ConstructorType */:
+                case 159 /* ConstructSignature */:
+                    return "__new" /* New */;
+                case 160 /* IndexSignature */:
+                    return "__index" /* Index */;
+                case 250 /* ExportDeclaration */:
+                    return "__export" /* ExportStar */;
+                case 274 /* SourceFile */:
+                    // json file should behave as
+                    // module.exports = ...
+                    return "export=" /* ExportEquals */;
+                case 200 /* BinaryExpression */:
+                    if (ts.getSpecialPropertyAssignmentKind(node) === 2 /* ModuleExports */) {
+                        // module.exports = ...
+                        return "export=" /* ExportEquals */;
+                    }
+                    ts.Debug.fail("Unknown binary declaration kind");
+                    break;
+                case 284 /* JSDocFunctionType */:
+                    return (ts.isJSDocConstructSignature(node) ? "__new" /* New */ : "__call" /* Call */);
+                case 149 /* Parameter */:
+                    // Parameters with names are handled at the top of this function.  Parameters
+                    // without names can only come from JSDocFunctionTypes.
+                    ts.Debug.assert(node.parent.kind === 284 /* JSDocFunctionType */, "Impossible parameter parent kind", function () { return "parent is: " + (ts.SyntaxKind ? ts.SyntaxKind[node.parent.kind] : node.parent.kind) + ", expected JSDocFunctionType"; });
+                    var functionType = node.parent;
+                    var index = functionType.parameters.indexOf(node);
+                    return "arg" + index;
+            }
+        }
+        function getDisplayName(node) {
+            return ts.isNamedDeclaration(node) ? ts.declarationNameToString(node.name) : ts.unescapeLeadingUnderscores(getDeclarationName(node)); // TODO: GH#18217
+        }
+        /**
+         * Declares a Symbol for the node and adds it to symbols. Reports errors for conflicting identifier names.
+         * @param symbolTable - The symbol table which node will be added to.
+         * @param parent - node's parent declaration.
+         * @param node - The declaration to be added to the symbol table
+         * @param includes - The SymbolFlags that node has in addition to its declaration type (eg: export, ambient, etc.)
+         * @param excludes - The flags which node cannot be declared alongside in a symbol table. Used to report forbidden declarations.
+         */
+        function declareSymbol(symbolTable, parent, node, includes, excludes, isReplaceableByMethod) {
+            ts.Debug.assert(!ts.hasDynamicName(node));
+            var isDefaultExport = ts.hasModifier(node, 512 /* Default */);
+            // The exported symbol for an export default function/class node is always named "default"
+            var name = isDefaultExport && parent ? "default" /* Default */ : getDeclarationName(node);
+            var symbol;
+            if (name === undefined) {
+                symbol = createSymbol(0 /* None */, "__missing" /* Missing */);
+            }
+            else {
+                // Check and see if the symbol table already has a symbol with this name.  If not,
+                // create a new symbol with this name and add it to the table.  Note that we don't
+                // give the new symbol any flags *yet*.  This ensures that it will not conflict
+                // with the 'excludes' flags we pass in.
+                //
+                // If we do get an existing symbol, see if it conflicts with the new symbol we're
+                // creating.  For example, a 'var' symbol and a 'class' symbol will conflict within
+                // the same symbol table.  If we have a conflict, report the issue on each
+                // declaration we have for this symbol, and then create a new symbol for this
+                // declaration.
+                //
+                // Note that when properties declared in Javascript constructors
+                // (marked by isReplaceableByMethod) conflict with another symbol, the property loses.
+                // Always. This allows the common Javascript pattern of overwriting a prototype method
+                // with an bound instance method of the same type: `this.method = this.method.bind(this)`
+                //
+                // If we created a new symbol, either because we didn't have a symbol with this name
+                // in the symbol table, or we conflicted with an existing symbol, then just add this
+                // node as the sole declaration of the new symbol.
+                //
+                // Otherwise, we'll be merging into a compatible existing symbol (for example when
+                // you have multiple 'vars' with the same name in the same container).  In this case
+                // just add this node into the declarations list of the symbol.
+                symbol = symbolTable.get(name);
+                if (includes & 2885600 /* Classifiable */) {
+                    classifiableNames.set(name, true);
+                }
+                if (!symbol) {
+                    symbolTable.set(name, symbol = createSymbol(0 /* None */, name));
+                    if (isReplaceableByMethod)
+                        symbol.isReplaceableByMethod = true;
+                }
+                else if (isReplaceableByMethod && !symbol.isReplaceableByMethod) {
+                    // A symbol already exists, so don't add this as a declaration.
+                    return symbol;
+                }
+                else if (symbol.flags & excludes) {
+                    if (symbol.isReplaceableByMethod) {
+                        // Javascript constructor-declared symbols can be discarded in favor of
+                        // prototype symbols like methods.
+                        symbolTable.set(name, symbol = createSymbol(0 /* None */, name));
+                    }
+                    else {
+                        if (ts.isNamedDeclaration(node)) {
+                            node.name.parent = node;
+                        }
+                        // Report errors every position with duplicate declaration
+                        // Report errors on previous encountered declarations
+                        var message_1 = symbol.flags & 2 /* BlockScopedVariable */
+                            ? ts.Diagnostics.Cannot_redeclare_block_scoped_variable_0
+                            : ts.Diagnostics.Duplicate_identifier_0;
+                        if (symbol.flags & 384 /* Enum */ || includes & 384 /* Enum */) {
+                            message_1 = ts.Diagnostics.Enum_declarations_can_only_merge_with_namespace_or_other_enum_declarations;
+                        }
+                        if (symbol.declarations && symbol.declarations.length) {
+                            // If the current node is a default export of some sort, then check if
+                            // there are any other default exports that we need to error on.
+                            // We'll know whether we have other default exports depending on if `symbol` already has a declaration list set.
+                            if (isDefaultExport) {
+                                message_1 = ts.Diagnostics.A_module_cannot_have_multiple_default_exports;
+                            }
+                            else {
+                                // This is to properly report an error in the case "export default { }" is after export default of class declaration or function declaration.
+                                // Error on multiple export default in the following case:
+                                // 1. multiple export default of class declaration or function declaration by checking NodeFlags.Default
+                                // 2. multiple export default of export assignment. This one doesn't have NodeFlags.Default on (as export default doesn't considered as modifiers)
+                                if (symbol.declarations && symbol.declarations.length &&
+                                    (node.kind === 249 /* ExportAssignment */ && !node.isExportEquals)) {
+                                    message_1 = ts.Diagnostics.A_module_cannot_have_multiple_default_exports;
+                                }
+                            }
+                        }
+                        ts.forEach(symbol.declarations, function (declaration) {
+                            file.bindDiagnostics.push(createDiagnosticForNode(ts.getNameOfDeclaration(declaration) || declaration, message_1, getDisplayName(declaration)));
+                        });
+                        file.bindDiagnostics.push(createDiagnosticForNode(ts.getNameOfDeclaration(node) || node, message_1, getDisplayName(node)));
+                        symbol = createSymbol(0 /* None */, name);
+                    }
+                }
+            }
+            addDeclarationToSymbol(symbol, node, includes);
+            if (symbol.parent) {
+                ts.Debug.assert(symbol.parent === parent, "Existing symbol parent should match new one");
+            }
+            else {
+                symbol.parent = parent;
+            }
+            return symbol;
+        }
+        function declareModuleMember(node, symbolFlags, symbolExcludes) {
+            var hasExportModifier = ts.getCombinedModifierFlags(node) & 1 /* Export */;
+            if (symbolFlags & 2097152 /* Alias */) {
+                if (node.kind === 252 /* ExportSpecifier */ || (node.kind === 243 /* ImportEqualsDeclaration */ && hasExportModifier)) {
+                    return declareSymbol(container.symbol.exports, container.symbol, node, symbolFlags, symbolExcludes);
+                }
+                else {
+                    return declareSymbol(container.locals, /*parent*/ undefined, node, symbolFlags, symbolExcludes);
+                }
+            }
+            else {
+                // Exported module members are given 2 symbols: A local symbol that is classified with an ExportValue flag,
+                // and an associated export symbol with all the correct flags set on it. There are 2 main reasons:
+                //
+                //   1. We treat locals and exports of the same name as mutually exclusive within a container.
+                //      That means the binder will issue a Duplicate Identifier error if you mix locals and exports
+                //      with the same name in the same container.
+                //      TODO: Make this a more specific error and decouple it from the exclusion logic.
+                //   2. When we checkIdentifier in the checker, we set its resolved symbol to the local symbol,
+                //      but return the export symbol (by calling getExportSymbolOfValueSymbolIfExported). That way
+                //      when the emitter comes back to it, it knows not to qualify the name if it was found in a containing scope.
+                // NOTE: Nested ambient modules always should go to to 'locals' table to prevent their automatic merge
+                //       during global merging in the checker. Why? The only case when ambient module is permitted inside another module is module augmentation
+                //       and this case is specially handled. Module augmentations should only be merged with original module definition
+                //       and should never be merged directly with other augmentation, and the latter case would be possible if automatic merge is allowed.
+                if (ts.isJSDocTypeAlias(node))
+                    ts.Debug.assert(ts.isInJavaScriptFile(node)); // We shouldn't add symbols for JSDoc nodes if not in a JS file.
+                if ((!ts.isAmbientModule(node) && (hasExportModifier || container.flags & 32 /* ExportContext */)) || ts.isJSDocTypeAlias(node)) {
+                    if (ts.hasModifier(node, 512 /* Default */) && !getDeclarationName(node)) {
+                        return declareSymbol(container.symbol.exports, container.symbol, node, symbolFlags, symbolExcludes); // No local symbol for an unnamed default!
+                    }
+                    var exportKind = symbolFlags & 67216319 /* Value */ ? 1048576 /* ExportValue */ : 0;
+                    var local = declareSymbol(container.locals, /*parent*/ undefined, node, exportKind, symbolExcludes);
+                    local.exportSymbol = declareSymbol(container.symbol.exports, container.symbol, node, symbolFlags, symbolExcludes);
+                    node.localSymbol = local;
+                    return local;
+                }
+                else {
+                    return declareSymbol(container.locals, /*parent*/ undefined, node, symbolFlags, symbolExcludes);
+                }
+            }
+        }
+        // All container nodes are kept on a linked list in declaration order. This list is used by
+        // the getLocalNameOfContainer function in the type checker to validate that the local name
+        // used for a container is unique.
+        function bindContainer(node, containerFlags) {
+            // Before we recurse into a node's children, we first save the existing parent, container
+            // and block-container.  Then after we pop out of processing the children, we restore
+            // these saved values.
+            var saveContainer = container;
+            var saveThisParentContainer = thisParentContainer;
+            var savedBlockScopeContainer = blockScopeContainer;
+            // Depending on what kind of node this is, we may have to adjust the current container
+            // and block-container.   If the current node is a container, then it is automatically
+            // considered the current block-container as well.  Also, for containers that we know
+            // may contain locals, we eagerly initialize the .locals field. We do this because
+            // it's highly likely that the .locals will be needed to place some child in (for example,
+            // a parameter, or variable declaration).
+            //
+            // However, we do not proactively create the .locals for block-containers because it's
+            // totally normal and common for block-containers to never actually have a block-scoped
+            // variable in them.  We don't want to end up allocating an object for every 'block' we
+            // run into when most of them won't be necessary.
+            //
+            // Finally, if this is a block-container, then we clear out any existing .locals object
+            // it may contain within it.  This happens in incremental scenarios.  Because we can be
+            // reusing a node from a previous compilation, that node may have had 'locals' created
+            // for it.  We must clear this so we don't accidentally move any stale data forward from
+            // a previous compilation.
+            if (containerFlags & 1 /* IsContainer */) {
+                if (node.kind !== 193 /* ArrowFunction */) {
+                    thisParentContainer = container;
+                }
+                container = blockScopeContainer = node;
+                if (containerFlags & 32 /* HasLocals */) {
+                    container.locals = ts.createSymbolTable();
+                }
+                addToContainerChain(container);
+            }
+            else if (containerFlags & 2 /* IsBlockScopedContainer */) {
+                blockScopeContainer = node;
+                blockScopeContainer.locals = undefined;
+            }
+            if (containerFlags & 4 /* IsControlFlowContainer */) {
+                var saveCurrentFlow = currentFlow;
+                var saveBreakTarget = currentBreakTarget;
+                var saveContinueTarget = currentContinueTarget;
+                var saveReturnTarget = currentReturnTarget;
+                var saveActiveLabels = activeLabels;
+                var saveHasExplicitReturn = hasExplicitReturn;
+                var isIIFE = containerFlags & 16 /* IsFunctionExpression */ && !ts.hasModifier(node, 256 /* Async */) &&
+                    !node.asteriskToken && !!ts.getImmediatelyInvokedFunctionExpression(node);
+                // A non-async, non-generator IIFE is considered part of the containing control flow. Return statements behave
+                // similarly to break statements that exit to a label just past the statement body.
+                if (!isIIFE) {
+                    currentFlow = { flags: 2 /* Start */ };
+                    if (containerFlags & (16 /* IsFunctionExpression */ | 128 /* IsObjectLiteralOrClassExpressionMethod */)) {
+                        currentFlow.container = node;
+                    }
+                }
+                // We create a return control flow graph for IIFEs and constructors. For constructors
+                // we use the return control flow graph in strict property intialization checks.
+                currentReturnTarget = isIIFE || node.kind === 155 /* Constructor */ ? createBranchLabel() : undefined;
+                currentBreakTarget = undefined;
+                currentContinueTarget = undefined;
+                activeLabels = undefined;
+                hasExplicitReturn = false;
+                bindChildren(node);
+                // Reset all reachability check related flags on node (for incremental scenarios)
+                node.flags &= ~1408 /* ReachabilityAndEmitFlags */;
+                if (!(currentFlow.flags & 1 /* Unreachable */) && containerFlags & 8 /* IsFunctionLike */ && ts.nodeIsPresent(node.body)) {
+                    node.flags |= 128 /* HasImplicitReturn */;
+                    if (hasExplicitReturn)
+                        node.flags |= 256 /* HasExplicitReturn */;
+                }
+                if (node.kind === 274 /* SourceFile */) {
+                    node.flags |= emitFlags;
+                }
+                if (currentReturnTarget) {
+                    addAntecedent(currentReturnTarget, currentFlow);
+                    currentFlow = finishFlowLabel(currentReturnTarget);
+                    if (node.kind === 155 /* Constructor */) {
+                        node.returnFlowNode = currentFlow;
+                    }
+                }
+                if (!isIIFE) {
+                    currentFlow = saveCurrentFlow;
+                }
+                currentBreakTarget = saveBreakTarget;
+                currentContinueTarget = saveContinueTarget;
+                currentReturnTarget = saveReturnTarget;
+                activeLabels = saveActiveLabels;
+                hasExplicitReturn = saveHasExplicitReturn;
+            }
+            else if (containerFlags & 64 /* IsInterface */) {
+                seenThisKeyword = false;
+                bindChildren(node);
+                node.flags = seenThisKeyword ? node.flags | 64 /* ContainsThis */ : node.flags & ~64 /* ContainsThis */;
+            }
+            else {
+                bindChildren(node);
+            }
+            container = saveContainer;
+            thisParentContainer = saveThisParentContainer;
+            blockScopeContainer = savedBlockScopeContainer;
+        }
+        function bindChildren(node) {
+            if (skipTransformFlagAggregation) {
+                bindChildrenWorker(node);
+            }
+            else if (node.transformFlags & 536870912 /* HasComputedFlags */) {
+                skipTransformFlagAggregation = true;
+                bindChildrenWorker(node);
+                skipTransformFlagAggregation = false;
+                subtreeTransformFlags |= node.transformFlags & ~getTransformFlagsSubtreeExclusions(node.kind);
+            }
+            else {
+                var savedSubtreeTransformFlags = subtreeTransformFlags;
+                subtreeTransformFlags = 0;
+                bindChildrenWorker(node);
+                subtreeTransformFlags = savedSubtreeTransformFlags | computeTransformFlagsForNode(node, subtreeTransformFlags);
+            }
+        }
+        function bindEachFunctionsFirst(nodes) {
+            bindEach(nodes, function (n) { return n.kind === 234 /* FunctionDeclaration */ ? bind(n) : undefined; });
+            bindEach(nodes, function (n) { return n.kind !== 234 /* FunctionDeclaration */ ? bind(n) : undefined; });
+        }
+        function bindEach(nodes, bindFunction) {
+            if (bindFunction === void 0) { bindFunction = bind; }
+            if (nodes === undefined) {
+                return;
+            }
+            if (skipTransformFlagAggregation) {
+                ts.forEach(nodes, bindFunction);
+            }
+            else {
+                var savedSubtreeTransformFlags = subtreeTransformFlags;
+                subtreeTransformFlags = 0 /* None */;
+                var nodeArrayFlags = 0 /* None */;
+                for (var _i = 0, nodes_1 = nodes; _i < nodes_1.length; _i++) {
+                    var node = nodes_1[_i];
+                    bindFunction(node);
+                    nodeArrayFlags |= node.transformFlags & ~536870912 /* HasComputedFlags */;
+                }
+                nodes.transformFlags = nodeArrayFlags | 536870912 /* HasComputedFlags */;
+                subtreeTransformFlags |= savedSubtreeTransformFlags;
+            }
+        }
+        function bindEachChild(node) {
+            ts.forEachChild(node, bind, bindEach);
+        }
+        function bindChildrenWorker(node) {
+            if (checkUnreachable(node)) {
+                bindEachChild(node);
+                return;
+            }
+            switch (node.kind) {
+                case 219 /* WhileStatement */:
+                    bindWhileStatement(node);
+                    break;
+                case 218 /* DoStatement */:
+                    bindDoStatement(node);
+                    break;
+                case 220 /* ForStatement */:
+                    bindForStatement(node);
+                    break;
+                case 221 /* ForInStatement */:
+                case 222 /* ForOfStatement */:
+                    bindForInOrForOfStatement(node);
+                    break;
+                case 217 /* IfStatement */:
+                    bindIfStatement(node);
+                    break;
+                case 225 /* ReturnStatement */:
+                case 229 /* ThrowStatement */:
+                    bindReturnOrThrow(node);
+                    break;
+                case 224 /* BreakStatement */:
+                case 223 /* ContinueStatement */:
+                    bindBreakOrContinueStatement(node);
+                    break;
+                case 230 /* TryStatement */:
+                    bindTryStatement(node);
+                    break;
+                case 227 /* SwitchStatement */:
+                    bindSwitchStatement(node);
+                    break;
+                case 241 /* CaseBlock */:
+                    bindCaseBlock(node);
+                    break;
+                case 266 /* CaseClause */:
+                    bindCaseClause(node);
+                    break;
+                case 228 /* LabeledStatement */:
+                    bindLabeledStatement(node);
+                    break;
+                case 198 /* PrefixUnaryExpression */:
+                    bindPrefixUnaryExpressionFlow(node);
+                    break;
+                case 199 /* PostfixUnaryExpression */:
+                    bindPostfixUnaryExpressionFlow(node);
+                    break;
+                case 200 /* BinaryExpression */:
+                    bindBinaryExpressionFlow(node);
+                    break;
+                case 194 /* DeleteExpression */:
+                    bindDeleteExpressionFlow(node);
+                    break;
+                case 201 /* ConditionalExpression */:
+                    bindConditionalExpressionFlow(node);
+                    break;
+                case 232 /* VariableDeclaration */:
+                    bindVariableDeclarationFlow(node);
+                    break;
+                case 187 /* CallExpression */:
+                    bindCallExpressionFlow(node);
+                    break;
+                case 297 /* JSDocTypedefTag */:
+                case 292 /* JSDocCallbackTag */:
+                    bindJSDocTypeAlias(node);
+                    break;
+                // In source files and blocks, bind functions first to match hoisting that occurs at runtime
+                case 274 /* SourceFile */:
+                    bindEachFunctionsFirst(node.statements);
+                    bind(node.endOfFileToken);
+                    break;
+                case 213 /* Block */:
+                case 240 /* ModuleBlock */:
+                    bindEachFunctionsFirst(node.statements);
+                    break;
+                default:
+                    bindEachChild(node);
+                    break;
+            }
+            bindJSDoc(node);
+        }
+        function isNarrowingExpression(expr) {
+            switch (expr.kind) {
+                case 71 /* Identifier */:
+                case 99 /* ThisKeyword */:
+                case 185 /* PropertyAccessExpression */:
+                    return isNarrowableReference(expr);
+                case 187 /* CallExpression */:
+                    return hasNarrowableArgument(expr);
+                case 191 /* ParenthesizedExpression */:
+                    return isNarrowingExpression(expr.expression);
+                case 200 /* BinaryExpression */:
+                    return isNarrowingBinaryExpression(expr);
+                case 198 /* PrefixUnaryExpression */:
+                    return expr.operator === 51 /* ExclamationToken */ && isNarrowingExpression(expr.operand);
+            }
+            return false;
+        }
+        function isNarrowableReference(expr) {
+            return expr.kind === 71 /* Identifier */ ||
+                expr.kind === 99 /* ThisKeyword */ ||
+                expr.kind === 97 /* SuperKeyword */ ||
+                expr.kind === 185 /* PropertyAccessExpression */ && isNarrowableReference(expr.expression);
+        }
+        function hasNarrowableArgument(expr) {
+            if (expr.arguments) {
+                for (var _i = 0, _a = expr.arguments; _i < _a.length; _i++) {
+                    var argument = _a[_i];
+                    if (isNarrowableReference(argument)) {
+                        return true;
+                    }
+                }
+            }
+            if (expr.expression.kind === 185 /* PropertyAccessExpression */ &&
+                isNarrowableReference(expr.expression.expression)) {
+                return true;
+            }
+            return false;
+        }
+        function isNarrowingTypeofOperands(expr1, expr2) {
+            return ts.isTypeOfExpression(expr1) && isNarrowableOperand(expr1.expression) && ts.isStringLiteralLike(expr2);
+        }
+        function isNarrowableInOperands(left, right) {
+            return ts.isStringLiteralLike(left) && isNarrowingExpression(right);
+        }
+        function isNarrowingBinaryExpression(expr) {
+            switch (expr.operatorToken.kind) {
+                case 58 /* EqualsToken */:
+                    return isNarrowableReference(expr.left);
+                case 32 /* EqualsEqualsToken */:
+                case 33 /* ExclamationEqualsToken */:
+                case 34 /* EqualsEqualsEqualsToken */:
+                case 35 /* ExclamationEqualsEqualsToken */:
+                    return isNarrowableOperand(expr.left) || isNarrowableOperand(expr.right) ||
+                        isNarrowingTypeofOperands(expr.right, expr.left) || isNarrowingTypeofOperands(expr.left, expr.right);
+                case 93 /* InstanceOfKeyword */:
+                    return isNarrowableOperand(expr.left);
+                case 92 /* InKeyword */:
+                    return isNarrowableInOperands(expr.left, expr.right);
+                case 26 /* CommaToken */:
+                    return isNarrowingExpression(expr.right);
+            }
+            return false;
+        }
+        function isNarrowableOperand(expr) {
+            switch (expr.kind) {
+                case 191 /* ParenthesizedExpression */:
+                    return isNarrowableOperand(expr.expression);
+                case 200 /* BinaryExpression */:
+                    switch (expr.operatorToken.kind) {
+                        case 58 /* EqualsToken */:
+                            return isNarrowableOperand(expr.left);
+                        case 26 /* CommaToken */:
+                            return isNarrowableOperand(expr.right);
+                    }
+            }
+            return isNarrowableReference(expr);
+        }
+        function createBranchLabel() {
+            return {
+                flags: 4 /* BranchLabel */,
+                antecedents: undefined
+            };
+        }
+        function createLoopLabel() {
+            return {
+                flags: 8 /* LoopLabel */,
+                antecedents: undefined
+            };
+        }
+        function setFlowNodeReferenced(flow) {
+            // On first reference we set the Referenced flag, thereafter we set the Shared flag
+            flow.flags |= flow.flags & 512 /* Referenced */ ? 1024 /* Shared */ : 512 /* Referenced */;
+        }
+        function addAntecedent(label, antecedent) {
+            if (!(antecedent.flags & 1 /* Unreachable */) && !ts.contains(label.antecedents, antecedent)) {
+                (label.antecedents || (label.antecedents = [])).push(antecedent);
+                setFlowNodeReferenced(antecedent);
+            }
+        }
+        function createFlowCondition(flags, antecedent, expression) {
+            if (antecedent.flags & 1 /* Unreachable */) {
+                return antecedent;
+            }
+            if (!expression) {
+                return flags & 32 /* TrueCondition */ ? antecedent : unreachableFlow;
+            }
+            if (expression.kind === 101 /* TrueKeyword */ && flags & 64 /* FalseCondition */ ||
+                expression.kind === 86 /* FalseKeyword */ && flags & 32 /* TrueCondition */) {
+                return unreachableFlow;
+            }
+            if (!isNarrowingExpression(expression)) {
+                return antecedent;
+            }
+            setFlowNodeReferenced(antecedent);
+            return { flags: flags, expression: expression, antecedent: antecedent };
+        }
+        function createFlowSwitchClause(antecedent, switchStatement, clauseStart, clauseEnd) {
+            if (!isNarrowingExpression(switchStatement.expression)) {
+                return antecedent;
+            }
+            setFlowNodeReferenced(antecedent);
+            return { flags: 128 /* SwitchClause */, switchStatement: switchStatement, clauseStart: clauseStart, clauseEnd: clauseEnd, antecedent: antecedent };
+        }
+        function createFlowAssignment(antecedent, node) {
+            setFlowNodeReferenced(antecedent);
+            return { flags: 16 /* Assignment */, antecedent: antecedent, node: node };
+        }
+        function createFlowArrayMutation(antecedent, node) {
+            setFlowNodeReferenced(antecedent);
+            var res = { flags: 256 /* ArrayMutation */, antecedent: antecedent, node: node };
+            return res;
+        }
+        function finishFlowLabel(flow) {
+            var antecedents = flow.antecedents;
+            if (!antecedents) {
+                return unreachableFlow;
+            }
+            if (antecedents.length === 1) {
+                return antecedents[0];
+            }
+            return flow;
+        }
+        function isStatementCondition(node) {
+            var parent = node.parent;
+            switch (parent.kind) {
+                case 217 /* IfStatement */:
+                case 219 /* WhileStatement */:
+                case 218 /* DoStatement */:
+                    return parent.expression === node;
+                case 220 /* ForStatement */:
+                case 201 /* ConditionalExpression */:
+                    return parent.condition === node;
+            }
+            return false;
+        }
+        function isLogicalExpression(node) {
+            while (true) {
+                if (node.kind === 191 /* ParenthesizedExpression */) {
+                    node = node.expression;
+                }
+                else if (node.kind === 198 /* PrefixUnaryExpression */ && node.operator === 51 /* ExclamationToken */) {
+                    node = node.operand;
+                }
+                else {
+                    return node.kind === 200 /* BinaryExpression */ && (node.operatorToken.kind === 53 /* AmpersandAmpersandToken */ ||
+                        node.operatorToken.kind === 54 /* BarBarToken */);
+                }
+            }
+        }
+        function isTopLevelLogicalExpression(node) {
+            while (node.parent.kind === 191 /* ParenthesizedExpression */ ||
+                node.parent.kind === 198 /* PrefixUnaryExpression */ &&
+                    node.parent.operator === 51 /* ExclamationToken */) {
+                node = node.parent;
+            }
+            return !isStatementCondition(node) && !isLogicalExpression(node.parent);
+        }
+        function bindCondition(node, trueTarget, falseTarget) {
+            var saveTrueTarget = currentTrueTarget;
+            var saveFalseTarget = currentFalseTarget;
+            currentTrueTarget = trueTarget;
+            currentFalseTarget = falseTarget;
+            bind(node);
+            currentTrueTarget = saveTrueTarget;
+            currentFalseTarget = saveFalseTarget;
+            if (!node || !isLogicalExpression(node)) {
+                addAntecedent(trueTarget, createFlowCondition(32 /* TrueCondition */, currentFlow, node));
+                addAntecedent(falseTarget, createFlowCondition(64 /* FalseCondition */, currentFlow, node));
+            }
+        }
+        function bindIterativeStatement(node, breakTarget, continueTarget) {
+            var saveBreakTarget = currentBreakTarget;
+            var saveContinueTarget = currentContinueTarget;
+            currentBreakTarget = breakTarget;
+            currentContinueTarget = continueTarget;
+            bind(node);
+            currentBreakTarget = saveBreakTarget;
+            currentContinueTarget = saveContinueTarget;
+        }
+        function bindWhileStatement(node) {
+            var preWhileLabel = createLoopLabel();
+            var preBodyLabel = createBranchLabel();
+            var postWhileLabel = createBranchLabel();
+            addAntecedent(preWhileLabel, currentFlow);
+            currentFlow = preWhileLabel;
+            bindCondition(node.expression, preBodyLabel, postWhileLabel);
+            currentFlow = finishFlowLabel(preBodyLabel);
+            bindIterativeStatement(node.statement, postWhileLabel, preWhileLabel);
+            addAntecedent(preWhileLabel, currentFlow);
+            currentFlow = finishFlowLabel(postWhileLabel);
+        }
+        function bindDoStatement(node) {
+            var preDoLabel = createLoopLabel();
+            var enclosingLabeledStatement = node.parent.kind === 228 /* LabeledStatement */
+                ? ts.lastOrUndefined(activeLabels)
+                : undefined;
+            // if do statement is wrapped in labeled statement then target labels for break/continue with or without
+            // label should be the same
+            var preConditionLabel = enclosingLabeledStatement ? enclosingLabeledStatement.continueTarget : createBranchLabel();
+            var postDoLabel = enclosingLabeledStatement ? enclosingLabeledStatement.breakTarget : createBranchLabel();
+            addAntecedent(preDoLabel, currentFlow);
+            currentFlow = preDoLabel;
+            bindIterativeStatement(node.statement, postDoLabel, preConditionLabel);
+            addAntecedent(preConditionLabel, currentFlow);
+            currentFlow = finishFlowLabel(preConditionLabel);
+            bindCondition(node.expression, preDoLabel, postDoLabel);
+            currentFlow = finishFlowLabel(postDoLabel);
+        }
+        function bindForStatement(node) {
+            var preLoopLabel = createLoopLabel();
+            var preBodyLabel = createBranchLabel();
+            var postLoopLabel = createBranchLabel();
+            bind(node.initializer);
+            addAntecedent(preLoopLabel, currentFlow);
+            currentFlow = preLoopLabel;
+            bindCondition(node.condition, preBodyLabel, postLoopLabel);
+            currentFlow = finishFlowLabel(preBodyLabel);
+            bindIterativeStatement(node.statement, postLoopLabel, preLoopLabel);
+            bind(node.incrementor);
+            addAntecedent(preLoopLabel, currentFlow);
+            currentFlow = finishFlowLabel(postLoopLabel);
+        }
+        function bindForInOrForOfStatement(node) {
+            var preLoopLabel = createLoopLabel();
+            var postLoopLabel = createBranchLabel();
+            addAntecedent(preLoopLabel, currentFlow);
+            currentFlow = preLoopLabel;
+            if (node.kind === 222 /* ForOfStatement */) {
+                bind(node.awaitModifier);
+            }
+            bind(node.expression);
+            addAntecedent(postLoopLabel, currentFlow);
+            bind(node.initializer);
+            if (node.initializer.kind !== 233 /* VariableDeclarationList */) {
+                bindAssignmentTargetFlow(node.initializer);
+            }
+            bindIterativeStatement(node.statement, postLoopLabel, preLoopLabel);
+            addAntecedent(preLoopLabel, currentFlow);
+            currentFlow = finishFlowLabel(postLoopLabel);
+        }
+        function bindIfStatement(node) {
+            var thenLabel = createBranchLabel();
+            var elseLabel = createBranchLabel();
+            var postIfLabel = createBranchLabel();
+            bindCondition(node.expression, thenLabel, elseLabel);
+            currentFlow = finishFlowLabel(thenLabel);
+            bind(node.thenStatement);
+            addAntecedent(postIfLabel, currentFlow);
+            currentFlow = finishFlowLabel(elseLabel);
+            bind(node.elseStatement);
+            addAntecedent(postIfLabel, currentFlow);
+            currentFlow = finishFlowLabel(postIfLabel);
+        }
+        function bindReturnOrThrow(node) {
+            bind(node.expression);
+            if (node.kind === 225 /* ReturnStatement */) {
+                hasExplicitReturn = true;
+                if (currentReturnTarget) {
+                    addAntecedent(currentReturnTarget, currentFlow);
+                }
+            }
+            currentFlow = unreachableFlow;
+        }
+        function findActiveLabel(name) {
+            if (activeLabels) {
+                for (var _i = 0, activeLabels_1 = activeLabels; _i < activeLabels_1.length; _i++) {
+                    var label = activeLabels_1[_i];
+                    if (label.name === name) {
+                        return label;
+                    }
+                }
+            }
+            return undefined;
+        }
+        function bindBreakOrContinueFlow(node, breakTarget, continueTarget) {
+            var flowLabel = node.kind === 224 /* BreakStatement */ ? breakTarget : continueTarget;
+            if (flowLabel) {
+                addAntecedent(flowLabel, currentFlow);
+                currentFlow = unreachableFlow;
+            }
+        }
+        function bindBreakOrContinueStatement(node) {
+            bind(node.label);
+            if (node.label) {
+                var activeLabel = findActiveLabel(node.label.escapedText);
+                if (activeLabel) {
+                    activeLabel.referenced = true;
+                    bindBreakOrContinueFlow(node, activeLabel.breakTarget, activeLabel.continueTarget);
+                }
+            }
+            else {
+                bindBreakOrContinueFlow(node, currentBreakTarget, currentContinueTarget);
+            }
+        }
+        function bindTryStatement(node) {
+            var preFinallyLabel = createBranchLabel();
+            var preTryFlow = currentFlow;
+            // TODO: Every statement in try block is potentially an exit point!
+            bind(node.tryBlock);
+            addAntecedent(preFinallyLabel, currentFlow);
+            var flowAfterTry = currentFlow;
+            var flowAfterCatch = unreachableFlow;
+            if (node.catchClause) {
+                currentFlow = preTryFlow;
+                bind(node.catchClause);
+                addAntecedent(preFinallyLabel, currentFlow);
+                flowAfterCatch = currentFlow;
+            }
+            if (node.finallyBlock) {
+                // in finally flow is combined from pre-try/flow from try/flow from catch
+                // pre-flow is necessary to make sure that finally is reachable even if finally flows in both try and finally blocks are unreachable
+                // also for finally blocks we inject two extra edges into the flow graph.
+                // first -> edge that connects pre-try flow with the label at the beginning of the finally block, it has lock associated with it
+                // second -> edge that represents post-finally flow.
+                // these edges are used in following scenario:
+                // let a; (1)
+                // try { a = someOperation(); (2)}
+                // finally { (3) console.log(a) } (4)
+                // (5) a
+                // flow graph for this case looks roughly like this (arrows show ):
+                // (1-pre-try-flow) <--.. <-- (2-post-try-flow)
+                //  ^                                ^
+                //  |*****(3-pre-finally-label) -----|
+                //                ^
+                //                |-- ... <-- (4-post-finally-label) <--- (5)
+                // In case when we walk the flow starting from inside the finally block we want to take edge '*****' into account
+                // since it ensures that finally is always reachable. However when we start outside the finally block and go through label (5)
+                // then edge '*****' should be discarded because label 4 is only reachable if post-finally label-4 is reachable
+                // Simply speaking code inside finally block is treated as reachable as pre-try-flow
+                // since we conservatively assume that any line in try block can throw or return in which case we'll enter finally.
+                // However code after finally is reachable only if control flow was not abrupted in try/catch or finally blocks - it should be composed from
+                // final flows of these blocks without taking pre-try flow into account.
+                //
+                // extra edges that we inject allows to control this behavior
+                // if when walking the flow we step on post-finally edge - we can mark matching pre-finally edge as locked so it will be skipped.
+                var preFinallyFlow = { flags: 2048 /* PreFinally */, antecedent: preTryFlow, lock: {} };
+                addAntecedent(preFinallyLabel, preFinallyFlow);
+                currentFlow = finishFlowLabel(preFinallyLabel);
+                bind(node.finallyBlock);
+                // if flow after finally is unreachable - keep it
+                // otherwise check if flows after try and after catch are unreachable
+                // if yes - convert current flow to unreachable
+                // i.e.
+                // try { return "1" } finally { console.log(1); }
+                // console.log(2); // this line should be unreachable even if flow falls out of finally block
+                if (!(currentFlow.flags & 1 /* Unreachable */)) {
+                    if ((flowAfterTry.flags & 1 /* Unreachable */) && (flowAfterCatch.flags & 1 /* Unreachable */)) {
+                        currentFlow = flowAfterTry === reportedUnreachableFlow || flowAfterCatch === reportedUnreachableFlow
+                            ? reportedUnreachableFlow
+                            : unreachableFlow;
+                    }
+                }
+                if (!(currentFlow.flags & 1 /* Unreachable */)) {
+                    var afterFinallyFlow = { flags: 4096 /* AfterFinally */, antecedent: currentFlow };
+                    preFinallyFlow.lock = afterFinallyFlow;
+                    currentFlow = afterFinallyFlow;
+                }
+            }
+            else {
+                currentFlow = finishFlowLabel(preFinallyLabel);
+            }
+        }
+        function bindSwitchStatement(node) {
+            var postSwitchLabel = createBranchLabel();
+            bind(node.expression);
+            var saveBreakTarget = currentBreakTarget;
+            var savePreSwitchCaseFlow = preSwitchCaseFlow;
+            currentBreakTarget = postSwitchLabel;
+            preSwitchCaseFlow = currentFlow;
+            bind(node.caseBlock);
+            addAntecedent(postSwitchLabel, currentFlow);
+            var hasDefault = ts.forEach(node.caseBlock.clauses, function (c) { return c.kind === 267 /* DefaultClause */; });
+            // We mark a switch statement as possibly exhaustive if it has no default clause and if all
+            // case clauses have unreachable end points (e.g. they all return).
+            node.possiblyExhaustive = !hasDefault && !postSwitchLabel.antecedents;
+            if (!hasDefault) {
+                addAntecedent(postSwitchLabel, createFlowSwitchClause(preSwitchCaseFlow, node, 0, 0));
+            }
+            currentBreakTarget = saveBreakTarget;
+            preSwitchCaseFlow = savePreSwitchCaseFlow;
+            currentFlow = finishFlowLabel(postSwitchLabel);
+        }
+        function bindCaseBlock(node) {
+            var savedSubtreeTransformFlags = subtreeTransformFlags;
+            subtreeTransformFlags = 0;
+            var clauses = node.clauses;
+            var fallthroughFlow = unreachableFlow;
+            for (var i = 0; i < clauses.length; i++) {
+                var clauseStart = i;
+                while (!clauses[i].statements.length && i + 1 < clauses.length) {
+                    bind(clauses[i]);
+                    i++;
+                }
+                var preCaseLabel = createBranchLabel();
+                addAntecedent(preCaseLabel, createFlowSwitchClause(preSwitchCaseFlow, node.parent, clauseStart, i + 1));
+                addAntecedent(preCaseLabel, createFlowSwitchClause(preSwitchCaseFlow, node.parent, clauseStart, i + 1));
+                addAntecedent(preCaseLabel, fallthroughFlow);
+                currentFlow = finishFlowLabel(preCaseLabel);
+                var clause = clauses[i];
+                bind(clause);
+                fallthroughFlow = currentFlow;
+                if (!(currentFlow.flags & 1 /* Unreachable */) && i !== clauses.length - 1 && options.noFallthroughCasesInSwitch) {
+                    errorOnFirstToken(clause, ts.Diagnostics.Fallthrough_case_in_switch);
+                }
+            }
+            clauses.transformFlags = subtreeTransformFlags | 536870912 /* HasComputedFlags */;
+            subtreeTransformFlags |= savedSubtreeTransformFlags;
+        }
+        function bindCaseClause(node) {
+            var saveCurrentFlow = currentFlow;
+            currentFlow = preSwitchCaseFlow;
+            bind(node.expression);
+            currentFlow = saveCurrentFlow;
+            bindEach(node.statements);
+        }
+        function pushActiveLabel(name, breakTarget, continueTarget) {
+            var activeLabel = {
+                name: name,
+                breakTarget: breakTarget,
+                continueTarget: continueTarget,
+                referenced: false
+            };
+            (activeLabels || (activeLabels = [])).push(activeLabel);
+            return activeLabel;
+        }
+        function popActiveLabel() {
+            activeLabels.pop();
+        }
+        function bindLabeledStatement(node) {
+            var preStatementLabel = createLoopLabel();
+            var postStatementLabel = createBranchLabel();
+            bind(node.label);
+            addAntecedent(preStatementLabel, currentFlow);
+            var activeLabel = pushActiveLabel(node.label.escapedText, postStatementLabel, preStatementLabel);
+            bind(node.statement);
+            popActiveLabel();
+            if (!activeLabel.referenced && !options.allowUnusedLabels) {
+                errorOrSuggestionOnFirstToken(ts.unusedLabelIsError(options), node, ts.Diagnostics.Unused_label);
+            }
+            if (!node.statement || node.statement.kind !== 218 /* DoStatement */) {
+                // do statement sets current flow inside bindDoStatement
+                addAntecedent(postStatementLabel, currentFlow);
+                currentFlow = finishFlowLabel(postStatementLabel);
+            }
+        }
+        function bindDestructuringTargetFlow(node) {
+            if (node.kind === 200 /* BinaryExpression */ && node.operatorToken.kind === 58 /* EqualsToken */) {
+                bindAssignmentTargetFlow(node.left);
+            }
+            else {
+                bindAssignmentTargetFlow(node);
+            }
+        }
+        function bindAssignmentTargetFlow(node) {
+            if (isNarrowableReference(node)) {
+                currentFlow = createFlowAssignment(currentFlow, node);
+            }
+            else if (node.kind === 183 /* ArrayLiteralExpression */) {
+                for (var _i = 0, _a = node.elements; _i < _a.length; _i++) {
+                    var e = _a[_i];
+                    if (e.kind === 204 /* SpreadElement */) {
+                        bindAssignmentTargetFlow(e.expression);
+                    }
+                    else {
+                        bindDestructuringTargetFlow(e);
+                    }
+                }
+            }
+            else if (node.kind === 184 /* ObjectLiteralExpression */) {
+                for (var _b = 0, _c = node.properties; _b < _c.length; _b++) {
+                    var p = _c[_b];
+                    if (p.kind === 270 /* PropertyAssignment */) {
+                        bindDestructuringTargetFlow(p.initializer);
+                    }
+                    else if (p.kind === 271 /* ShorthandPropertyAssignment */) {
+                        bindAssignmentTargetFlow(p.name);
+                    }
+                    else if (p.kind === 272 /* SpreadAssignment */) {
+                        bindAssignmentTargetFlow(p.expression);
+                    }
+                }
+            }
+        }
+        function bindLogicalExpression(node, trueTarget, falseTarget) {
+            var preRightLabel = createBranchLabel();
+            if (node.operatorToken.kind === 53 /* AmpersandAmpersandToken */) {
+                bindCondition(node.left, preRightLabel, falseTarget);
+            }
+            else {
+                bindCondition(node.left, trueTarget, preRightLabel);
+            }
+            currentFlow = finishFlowLabel(preRightLabel);
+            bind(node.operatorToken);
+            bindCondition(node.right, trueTarget, falseTarget);
+        }
+        function bindPrefixUnaryExpressionFlow(node) {
+            if (node.operator === 51 /* ExclamationToken */) {
+                var saveTrueTarget = currentTrueTarget;
+                currentTrueTarget = currentFalseTarget;
+                currentFalseTarget = saveTrueTarget;
+                bindEachChild(node);
+                currentFalseTarget = currentTrueTarget;
+                currentTrueTarget = saveTrueTarget;
+            }
+            else {
+                bindEachChild(node);
+                if (node.operator === 43 /* PlusPlusToken */ || node.operator === 44 /* MinusMinusToken */) {
+                    bindAssignmentTargetFlow(node.operand);
+                }
+            }
+        }
+        function bindPostfixUnaryExpressionFlow(node) {
+            bindEachChild(node);
+            if (node.operator === 43 /* PlusPlusToken */ || node.operator === 44 /* MinusMinusToken */) {
+                bindAssignmentTargetFlow(node.operand);
+            }
+        }
+        function bindBinaryExpressionFlow(node) {
+            var operator = node.operatorToken.kind;
+            if (operator === 53 /* AmpersandAmpersandToken */ || operator === 54 /* BarBarToken */) {
+                if (isTopLevelLogicalExpression(node)) {
+                    var postExpressionLabel = createBranchLabel();
+                    bindLogicalExpression(node, postExpressionLabel, postExpressionLabel);
+                    currentFlow = finishFlowLabel(postExpressionLabel);
+                }
+                else {
+                    bindLogicalExpression(node, currentTrueTarget, currentFalseTarget);
+                }
+            }
+            else {
+                bindEachChild(node);
+                if (ts.isAssignmentOperator(operator) && !ts.isAssignmentTarget(node)) {
+                    bindAssignmentTargetFlow(node.left);
+                    if (operator === 58 /* EqualsToken */ && node.left.kind === 186 /* ElementAccessExpression */) {
+                        var elementAccess = node.left;
+                        if (isNarrowableOperand(elementAccess.expression)) {
+                            currentFlow = createFlowArrayMutation(currentFlow, node);
+                        }
+                    }
+                }
+            }
+        }
+        function bindDeleteExpressionFlow(node) {
+            bindEachChild(node);
+            if (node.expression.kind === 185 /* PropertyAccessExpression */) {
+                bindAssignmentTargetFlow(node.expression);
+            }
+        }
+        function bindConditionalExpressionFlow(node) {
+            var trueLabel = createBranchLabel();
+            var falseLabel = createBranchLabel();
+            var postExpressionLabel = createBranchLabel();
+            bindCondition(node.condition, trueLabel, falseLabel);
+            currentFlow = finishFlowLabel(trueLabel);
+            bind(node.questionToken);
+            bind(node.whenTrue);
+            addAntecedent(postExpressionLabel, currentFlow);
+            currentFlow = finishFlowLabel(falseLabel);
+            bind(node.colonToken);
+            bind(node.whenFalse);
+            addAntecedent(postExpressionLabel, currentFlow);
+            currentFlow = finishFlowLabel(postExpressionLabel);
+        }
+        function bindInitializedVariableFlow(node) {
+            var name = !ts.isOmittedExpression(node) ? node.name : undefined;
+            if (ts.isBindingPattern(name)) {
+                for (var _i = 0, _a = name.elements; _i < _a.length; _i++) {
+                    var child = _a[_i];
+                    bindInitializedVariableFlow(child);
+                }
+            }
+            else {
+                currentFlow = createFlowAssignment(currentFlow, node);
+            }
+        }
+        function bindVariableDeclarationFlow(node) {
+            bindEachChild(node);
+            if (node.initializer || ts.isForInOrOfStatement(node.parent.parent)) {
+                bindInitializedVariableFlow(node);
+            }
+        }
+        function bindJSDocTypeAlias(node) {
+            if (node.fullName) {
+                setParentPointers(node, node.fullName);
+            }
+        }
+        function bindCallExpressionFlow(node) {
+            // If the target of the call expression is a function expression or arrow function we have
+            // an immediately invoked function expression (IIFE). Initialize the flowNode property to
+            // the current control flow (which includes evaluation of the IIFE arguments).
+            var expr = node.expression;
+            while (expr.kind === 191 /* ParenthesizedExpression */) {
+                expr = expr.expression;
+            }
+            if (expr.kind === 192 /* FunctionExpression */ || expr.kind === 193 /* ArrowFunction */) {
+                bindEach(node.typeArguments);
+                bindEach(node.arguments);
+                bind(node.expression);
+            }
+            else {
+                bindEachChild(node);
+            }
+            if (node.expression.kind === 185 /* PropertyAccessExpression */) {
+                var propertyAccess = node.expression;
+                if (isNarrowableOperand(propertyAccess.expression) && ts.isPushOrUnshiftIdentifier(propertyAccess.name)) {
+                    currentFlow = createFlowArrayMutation(currentFlow, node);
+                }
+            }
+        }
+        function getContainerFlags(node) {
+            switch (node.kind) {
+                case 205 /* ClassExpression */:
+                case 235 /* ClassDeclaration */:
+                case 238 /* EnumDeclaration */:
+                case 184 /* ObjectLiteralExpression */:
+                case 166 /* TypeLiteral */:
+                case 287 /* JSDocTypeLiteral */:
+                case 263 /* JsxAttributes */:
+                    return 1 /* IsContainer */;
+                case 236 /* InterfaceDeclaration */:
+                    return 1 /* IsContainer */ | 64 /* IsInterface */;
+                case 239 /* ModuleDeclaration */:
+                case 237 /* TypeAliasDeclaration */:
+                case 177 /* MappedType */:
+                    return 1 /* IsContainer */ | 32 /* HasLocals */;
+                case 274 /* SourceFile */:
+                    return 1 /* IsContainer */ | 4 /* IsControlFlowContainer */ | 32 /* HasLocals */;
+                case 154 /* MethodDeclaration */:
+                    if (ts.isObjectLiteralOrClassExpressionMethod(node)) {
+                        return 1 /* IsContainer */ | 4 /* IsControlFlowContainer */ | 32 /* HasLocals */ | 8 /* IsFunctionLike */ | 128 /* IsObjectLiteralOrClassExpressionMethod */;
+                    }
+                // falls through
+                case 155 /* Constructor */:
+                case 234 /* FunctionDeclaration */:
+                case 153 /* MethodSignature */:
+                case 156 /* GetAccessor */:
+                case 157 /* SetAccessor */:
+                case 158 /* CallSignature */:
+                case 288 /* JSDocSignature */:
+                case 284 /* JSDocFunctionType */:
+                case 163 /* FunctionType */:
+                case 159 /* ConstructSignature */:
+                case 160 /* IndexSignature */:
+                case 164 /* ConstructorType */:
+                    return 1 /* IsContainer */ | 4 /* IsControlFlowContainer */ | 32 /* HasLocals */ | 8 /* IsFunctionLike */;
+                case 192 /* FunctionExpression */:
+                case 193 /* ArrowFunction */:
+                    return 1 /* IsContainer */ | 4 /* IsControlFlowContainer */ | 32 /* HasLocals */ | 8 /* IsFunctionLike */ | 16 /* IsFunctionExpression */;
+                case 240 /* ModuleBlock */:
+                    return 4 /* IsControlFlowContainer */;
+                case 152 /* PropertyDeclaration */:
+                    return node.initializer ? 4 /* IsControlFlowContainer */ : 0;
+                case 269 /* CatchClause */:
+                case 220 /* ForStatement */:
+                case 221 /* ForInStatement */:
+                case 222 /* ForOfStatement */:
+                case 241 /* CaseBlock */:
+                    return 2 /* IsBlockScopedContainer */;
+                case 213 /* Block */:
+                    // do not treat blocks directly inside a function as a block-scoped-container.
+                    // Locals that reside in this block should go to the function locals. Otherwise 'x'
+                    // would not appear to be a redeclaration of a block scoped local in the following
+                    // example:
+                    //
+                    //      function foo() {
+                    //          var x;
+                    //          let x;
+                    //      }
+                    //
+                    // If we placed 'var x' into the function locals and 'let x' into the locals of
+                    // the block, then there would be no collision.
+                    //
+                    // By not creating a new block-scoped-container here, we ensure that both 'var x'
+                    // and 'let x' go into the Function-container's locals, and we do get a collision
+                    // conflict.
+                    return ts.isFunctionLike(node.parent) ? 0 /* None */ : 2 /* IsBlockScopedContainer */;
+            }
+            return 0 /* None */;
+        }
+        function addToContainerChain(next) {
+            if (lastContainer) {
+                lastContainer.nextContainer = next;
+            }
+            lastContainer = next;
+        }
+        function declareSymbolAndAddToSymbolTable(node, symbolFlags, symbolExcludes) {
+            switch (container.kind) {
+                // Modules, source files, and classes need specialized handling for how their
+                // members are declared (for example, a member of a class will go into a specific
+                // symbol table depending on if it is static or not). We defer to specialized
+                // handlers to take care of declaring these child members.
+                case 239 /* ModuleDeclaration */:
+                    return declareModuleMember(node, symbolFlags, symbolExcludes);
+                case 274 /* SourceFile */:
+                    return declareSourceFileMember(node, symbolFlags, symbolExcludes);
+                case 205 /* ClassExpression */:
+                case 235 /* ClassDeclaration */:
+                    return declareClassMember(node, symbolFlags, symbolExcludes);
+                case 238 /* EnumDeclaration */:
+                    return declareSymbol(container.symbol.exports, container.symbol, node, symbolFlags, symbolExcludes);
+                case 166 /* TypeLiteral */:
+                case 287 /* JSDocTypeLiteral */:
+                case 184 /* ObjectLiteralExpression */:
+                case 236 /* InterfaceDeclaration */:
+                case 263 /* JsxAttributes */:
+                    // Interface/Object-types always have their children added to the 'members' of
+                    // their container. They are only accessible through an instance of their
+                    // container, and are never in scope otherwise (even inside the body of the
+                    // object / type / interface declaring them). An exception is type parameters,
+                    // which are in scope without qualification (similar to 'locals').
+                    return declareSymbol(container.symbol.members, container.symbol, node, symbolFlags, symbolExcludes);
+                case 163 /* FunctionType */:
+                case 164 /* ConstructorType */:
+                case 158 /* CallSignature */:
+                case 159 /* ConstructSignature */:
+                case 288 /* JSDocSignature */:
+                case 160 /* IndexSignature */:
+                case 154 /* MethodDeclaration */:
+                case 153 /* MethodSignature */:
+                case 155 /* Constructor */:
+                case 156 /* GetAccessor */:
+                case 157 /* SetAccessor */:
+                case 234 /* FunctionDeclaration */:
+                case 192 /* FunctionExpression */:
+                case 193 /* ArrowFunction */:
+                case 284 /* JSDocFunctionType */:
+                case 297 /* JSDocTypedefTag */:
+                case 292 /* JSDocCallbackTag */:
+                case 237 /* TypeAliasDeclaration */:
+                case 177 /* MappedType */:
+                    // All the children of these container types are never visible through another
+                    // symbol (i.e. through another symbol's 'exports' or 'members').  Instead,
+                    // they're only accessed 'lexically' (i.e. from code that exists underneath
+                    // their container in the tree). To accomplish this, we simply add their declared
+                    // symbol to the 'locals' of the container.  These symbols can then be found as
+                    // the type checker walks up the containers, checking them for matching names.
+                    return declareSymbol(container.locals, /*parent*/ undefined, node, symbolFlags, symbolExcludes);
+            }
+        }
+        function declareClassMember(node, symbolFlags, symbolExcludes) {
+            return ts.hasModifier(node, 32 /* Static */)
+                ? declareSymbol(container.symbol.exports, container.symbol, node, symbolFlags, symbolExcludes)
+                : declareSymbol(container.symbol.members, container.symbol, node, symbolFlags, symbolExcludes);
+        }
+        function declareSourceFileMember(node, symbolFlags, symbolExcludes) {
+            return ts.isExternalModule(file)
+                ? declareModuleMember(node, symbolFlags, symbolExcludes)
+                : declareSymbol(file.locals, /*parent*/ undefined, node, symbolFlags, symbolExcludes);
+        }
+        function hasExportDeclarations(node) {
+            var body = node.kind === 274 /* SourceFile */ ? node : node.body;
+            if (body && (body.kind === 274 /* SourceFile */ || body.kind === 240 /* ModuleBlock */)) {
+                for (var _i = 0, _a = body.statements; _i < _a.length; _i++) {
+                    var stat = _a[_i];
+                    if (stat.kind === 250 /* ExportDeclaration */ || stat.kind === 249 /* ExportAssignment */) {
+                        return true;
+                    }
+                }
+            }
+            return false;
+        }
+        function setExportContextFlag(node) {
+            // A declaration source file or ambient module declaration that contains no export declarations (but possibly regular
+            // declarations with export modifiers) is an export context in which declarations are implicitly exported.
+            if (node.flags & 4194304 /* Ambient */ && !hasExportDeclarations(node)) {
+                node.flags |= 32 /* ExportContext */;
+            }
+            else {
+                node.flags &= ~32 /* ExportContext */;
+            }
+        }
+        function bindModuleDeclaration(node) {
+            setExportContextFlag(node);
+            if (ts.isAmbientModule(node)) {
+                if (ts.hasModifier(node, 1 /* Export */)) {
+                    errorOnFirstToken(node, ts.Diagnostics.export_modifier_cannot_be_applied_to_ambient_modules_and_module_augmentations_since_they_are_always_visible);
+                }
+                if (ts.isModuleAugmentationExternal(node)) {
+                    declareModuleSymbol(node);
+                }
+                else {
+                    var pattern = void 0;
+                    if (node.name.kind === 9 /* StringLiteral */) {
+                        var text = node.name.text;
+                        if (ts.hasZeroOrOneAsteriskCharacter(text)) {
+                            pattern = ts.tryParsePattern(text);
+                        }
+                        else {
+                            errorOnFirstToken(node.name, ts.Diagnostics.Pattern_0_can_have_at_most_one_Asterisk_character, text);
+                        }
+                    }
+                    var symbol = declareSymbolAndAddToSymbolTable(node, 512 /* ValueModule */, 67215503 /* ValueModuleExcludes */);
+                    file.patternAmbientModules = ts.append(file.patternAmbientModules, pattern && { pattern: pattern, symbol: symbol });
+                }
+            }
+            else {
+                var state = declareModuleSymbol(node);
+                if (state !== 0 /* NonInstantiated */) {
+                    var symbol = node.symbol;
+                    // if module was already merged with some function, class or non-const enum, treat it as non-const-enum-only
+                    symbol.constEnumOnlyModule = (!(symbol.flags & (16 /* Function */ | 32 /* Class */ | 256 /* RegularEnum */)))
+                        // Current must be `const enum` only
+                        && state === 2 /* ConstEnumOnly */
+                        // Can't have been set to 'false' in a previous merged symbol. ('undefined' OK)
+                        && symbol.constEnumOnlyModule !== false;
+                }
+            }
+        }
+        function declareModuleSymbol(node) {
+            var state = getModuleInstanceState(node);
+            var instantiated = state !== 0 /* NonInstantiated */;
+            declareSymbolAndAddToSymbolTable(node, instantiated ? 512 /* ValueModule */ : 1024 /* NamespaceModule */, instantiated ? 67215503 /* ValueModuleExcludes */ : 0 /* NamespaceModuleExcludes */);
+            return state;
+        }
+        function bindFunctionOrConstructorType(node) {
+            // For a given function symbol "<...>(...) => T" we want to generate a symbol identical
+            // to the one we would get for: { <...>(...): T }
+            //
+            // We do that by making an anonymous type literal symbol, and then setting the function
+            // symbol as its sole member. To the rest of the system, this symbol will be indistinguishable
+            // from an actual type literal symbol you would have gotten had you used the long form.
+            var symbol = createSymbol(131072 /* Signature */, getDeclarationName(node)); // TODO: GH#18217
+            addDeclarationToSymbol(symbol, node, 131072 /* Signature */);
+            var typeLiteralSymbol = createSymbol(2048 /* TypeLiteral */, "__type" /* Type */);
+            addDeclarationToSymbol(typeLiteralSymbol, node, 2048 /* TypeLiteral */);
+            typeLiteralSymbol.members = ts.createSymbolTable();
+            typeLiteralSymbol.members.set(symbol.escapedName, symbol);
+        }
+        function bindObjectLiteralExpression(node) {
+            var ElementKind;
+            (function (ElementKind) {
+                ElementKind[ElementKind["Property"] = 1] = "Property";
+                ElementKind[ElementKind["Accessor"] = 2] = "Accessor";
+            })(ElementKind || (ElementKind = {}));
+            if (inStrictMode) {
+                var seen = ts.createUnderscoreEscapedMap();
+                for (var _i = 0, _a = node.properties; _i < _a.length; _i++) {
+                    var prop = _a[_i];
+                    if (prop.kind === 272 /* SpreadAssignment */ || prop.name.kind !== 71 /* Identifier */) {
+                        continue;
+                    }
+                    var identifier = prop.name;
+                    // ECMA-262 11.1.5 Object Initializer
+                    // If previous is not undefined then throw a SyntaxError exception if any of the following conditions are true
+                    // a.This production is contained in strict code and IsDataDescriptor(previous) is true and
+                    // IsDataDescriptor(propId.descriptor) is true.
+                    //    b.IsDataDescriptor(previous) is true and IsAccessorDescriptor(propId.descriptor) is true.
+                    //    c.IsAccessorDescriptor(previous) is true and IsDataDescriptor(propId.descriptor) is true.
+                    //    d.IsAccessorDescriptor(previous) is true and IsAccessorDescriptor(propId.descriptor) is true
+                    // and either both previous and propId.descriptor have[[Get]] fields or both previous and propId.descriptor have[[Set]] fields
+                    var currentKind = prop.kind === 270 /* PropertyAssignment */ || prop.kind === 271 /* ShorthandPropertyAssignment */ || prop.kind === 154 /* MethodDeclaration */
+                        ? 1 /* Property */
+                        : 2 /* Accessor */;
+                    var existingKind = seen.get(identifier.escapedText);
+                    if (!existingKind) {
+                        seen.set(identifier.escapedText, currentKind);
+                        continue;
+                    }
+                    if (currentKind === 1 /* Property */ && existingKind === 1 /* Property */) {
+                        var span = ts.getErrorSpanForNode(file, identifier);
+                        file.bindDiagnostics.push(ts.createFileDiagnostic(file, span.start, span.length, ts.Diagnostics.An_object_literal_cannot_have_multiple_properties_with_the_same_name_in_strict_mode));
+                    }
+                }
+            }
+            return bindAnonymousDeclaration(node, 4096 /* ObjectLiteral */, "__object" /* Object */);
+        }
+        function bindJsxAttributes(node) {
+            return bindAnonymousDeclaration(node, 4096 /* ObjectLiteral */, "__jsxAttributes" /* JSXAttributes */);
+        }
+        function bindJsxAttribute(node, symbolFlags, symbolExcludes) {
+            return declareSymbolAndAddToSymbolTable(node, symbolFlags, symbolExcludes);
+        }
+        function bindAnonymousDeclaration(node, symbolFlags, name) {
+            var symbol = createSymbol(symbolFlags, name);
+            if (symbolFlags & (8 /* EnumMember */ | 106500 /* ClassMember */)) {
+                symbol.parent = container.symbol;
+            }
+            addDeclarationToSymbol(symbol, node, symbolFlags);
+            return symbol;
+        }
+        function bindBlockScopedDeclaration(node, symbolFlags, symbolExcludes) {
+            switch (blockScopeContainer.kind) {
+                case 239 /* ModuleDeclaration */:
+                    declareModuleMember(node, symbolFlags, symbolExcludes);
+                    break;
+                case 274 /* SourceFile */:
+                    if (ts.isExternalOrCommonJsModule(container)) {
+                        declareModuleMember(node, symbolFlags, symbolExcludes);
+                        break;
+                    }
+                // falls through
+                default:
+                    if (!blockScopeContainer.locals) {
+                        blockScopeContainer.locals = ts.createSymbolTable();
+                        addToContainerChain(blockScopeContainer);
+                    }
+                    declareSymbol(blockScopeContainer.locals, /*parent*/ undefined, node, symbolFlags, symbolExcludes);
+            }
+        }
+        function bindBlockScopedVariableDeclaration(node) {
+            bindBlockScopedDeclaration(node, 2 /* BlockScopedVariable */, 67216319 /* BlockScopedVariableExcludes */);
+        }
+        function delayedBindJSDocTypedefTag() {
+            if (!delayedTypeAliases) {
+                return;
+            }
+            var saveContainer = container;
+            var saveLastContainer = lastContainer;
+            var saveBlockScopeContainer = blockScopeContainer;
+            var saveParent = parent;
+            var saveCurrentFlow = currentFlow;
+            for (var _i = 0, delayedTypeAliases_1 = delayedTypeAliases; _i < delayedTypeAliases_1.length; _i++) {
+                var typeAlias = delayedTypeAliases_1[_i];
+                var host = ts.getJSDocHost(typeAlias);
+                container = ts.findAncestor(host.parent, function (n) { return !!(getContainerFlags(n) & 1 /* IsContainer */); }) || file;
+                blockScopeContainer = ts.getEnclosingBlockScopeContainer(host) || file;
+                currentFlow = { flags: 2 /* Start */ };
+                parent = typeAlias;
+                bind(typeAlias.typeExpression);
+                if (!typeAlias.fullName || typeAlias.fullName.kind === 71 /* Identifier */) {
+                    parent = typeAlias.parent;
+                    bindBlockScopedDeclaration(typeAlias, 524288 /* TypeAlias */, 67901928 /* TypeAliasExcludes */);
+                }
+                else {
+                    bind(typeAlias.fullName);
+                }
+            }
+            container = saveContainer;
+            lastContainer = saveLastContainer;
+            blockScopeContainer = saveBlockScopeContainer;
+            parent = saveParent;
+            currentFlow = saveCurrentFlow;
+        }
+        // The binder visits every node in the syntax tree so it is a convenient place to perform a single localized
+        // check for reserved words used as identifiers in strict mode code.
+        function checkStrictModeIdentifier(node) {
+            if (inStrictMode &&
+                node.originalKeywordKind >= 108 /* FirstFutureReservedWord */ &&
+                node.originalKeywordKind <= 116 /* LastFutureReservedWord */ &&
+                !ts.isIdentifierName(node) &&
+                !(node.flags & 4194304 /* Ambient */)) {
+                // Report error only if there are no parse errors in file
+                if (!file.parseDiagnostics.length) {
+                    file.bindDiagnostics.push(createDiagnosticForNode(node, getStrictModeIdentifierMessage(node), ts.declarationNameToString(node)));
+                }
+            }
+        }
+        function getStrictModeIdentifierMessage(node) {
+            // Provide specialized messages to help the user understand why we think they're in
+            // strict mode.
+            if (ts.getContainingClass(node)) {
+                return ts.Diagnostics.Identifier_expected_0_is_a_reserved_word_in_strict_mode_Class_definitions_are_automatically_in_strict_mode;
+            }
+            if (file.externalModuleIndicator) {
+                return ts.Diagnostics.Identifier_expected_0_is_a_reserved_word_in_strict_mode_Modules_are_automatically_in_strict_mode;
+            }
+            return ts.Diagnostics.Identifier_expected_0_is_a_reserved_word_in_strict_mode;
+        }
+        function checkStrictModeBinaryExpression(node) {
+            if (inStrictMode && ts.isLeftHandSideExpression(node.left) && ts.isAssignmentOperator(node.operatorToken.kind)) {
+                // ECMA 262 (Annex C) The identifier eval or arguments may not appear as the LeftHandSideExpression of an
+                // Assignment operator(11.13) or of a PostfixExpression(11.3)
+                checkStrictModeEvalOrArguments(node, node.left);
+            }
+        }
+        function checkStrictModeCatchClause(node) {
+            // It is a SyntaxError if a TryStatement with a Catch occurs within strict code and the Identifier of the
+            // Catch production is eval or arguments
+            if (inStrictMode && node.variableDeclaration) {
+                checkStrictModeEvalOrArguments(node, node.variableDeclaration.name);
+            }
+        }
+        function checkStrictModeDeleteExpression(node) {
+            // Grammar checking
+            if (inStrictMode && node.expression.kind === 71 /* Identifier */) {
+                // When a delete operator occurs within strict mode code, a SyntaxError is thrown if its
+                // UnaryExpression is a direct reference to a variable, function argument, or function name
+                var span = ts.getErrorSpanForNode(file, node.expression);
+                file.bindDiagnostics.push(ts.createFileDiagnostic(file, span.start, span.length, ts.Diagnostics.delete_cannot_be_called_on_an_identifier_in_strict_mode));
+            }
+        }
+        function isEvalOrArgumentsIdentifier(node) {
+            return ts.isIdentifier(node) && (node.escapedText === "eval" || node.escapedText === "arguments");
+        }
+        function checkStrictModeEvalOrArguments(contextNode, name) {
+            if (name && name.kind === 71 /* Identifier */) {
+                var identifier = name;
+                if (isEvalOrArgumentsIdentifier(identifier)) {
+                    // We check first if the name is inside class declaration or class expression; if so give explicit message
+                    // otherwise report generic error message.
+                    var span = ts.getErrorSpanForNode(file, name);
+                    file.bindDiagnostics.push(ts.createFileDiagnostic(file, span.start, span.length, getStrictModeEvalOrArgumentsMessage(contextNode), ts.idText(identifier)));
+                }
+            }
+        }
+        function getStrictModeEvalOrArgumentsMessage(node) {
+            // Provide specialized messages to help the user understand why we think they're in
+            // strict mode.
+            if (ts.getContainingClass(node)) {
+                return ts.Diagnostics.Invalid_use_of_0_Class_definitions_are_automatically_in_strict_mode;
+            }
+            if (file.externalModuleIndicator) {
+                return ts.Diagnostics.Invalid_use_of_0_Modules_are_automatically_in_strict_mode;
+            }
+            return ts.Diagnostics.Invalid_use_of_0_in_strict_mode;
+        }
+        function checkStrictModeFunctionName(node) {
+            if (inStrictMode) {
+                // It is a SyntaxError if the identifier eval or arguments appears within a FormalParameterList of a strict mode FunctionDeclaration or FunctionExpression (13.1))
+                checkStrictModeEvalOrArguments(node, node.name);
+            }
+        }
+        function getStrictModeBlockScopeFunctionDeclarationMessage(node) {
+            // Provide specialized messages to help the user understand why we think they're in
+            // strict mode.
+            if (ts.getContainingClass(node)) {
+                return ts.Diagnostics.Function_declarations_are_not_allowed_inside_blocks_in_strict_mode_when_targeting_ES3_or_ES5_Class_definitions_are_automatically_in_strict_mode;
+            }
+            if (file.externalModuleIndicator) {
+                return ts.Diagnostics.Function_declarations_are_not_allowed_inside_blocks_in_strict_mode_when_targeting_ES3_or_ES5_Modules_are_automatically_in_strict_mode;
+            }
+            return ts.Diagnostics.Function_declarations_are_not_allowed_inside_blocks_in_strict_mode_when_targeting_ES3_or_ES5;
+        }
+        function checkStrictModeFunctionDeclaration(node) {
+            if (languageVersion < 2 /* ES2015 */) {
+                // Report error if function is not top level function declaration
+                if (blockScopeContainer.kind !== 274 /* SourceFile */ &&
+                    blockScopeContainer.kind !== 239 /* ModuleDeclaration */ &&
+                    !ts.isFunctionLike(blockScopeContainer)) {
+                    // We check first if the name is inside class declaration or class expression; if so give explicit message
+                    // otherwise report generic error message.
+                    var errorSpan = ts.getErrorSpanForNode(file, node);
+                    file.bindDiagnostics.push(ts.createFileDiagnostic(file, errorSpan.start, errorSpan.length, getStrictModeBlockScopeFunctionDeclarationMessage(node)));
+                }
+            }
+        }
+        function checkStrictModeNumericLiteral(node) {
+            if (inStrictMode && node.numericLiteralFlags & 32 /* Octal */) {
+                file.bindDiagnostics.push(createDiagnosticForNode(node, ts.Diagnostics.Octal_literals_are_not_allowed_in_strict_mode));
+            }
+        }
+        function checkStrictModePostfixUnaryExpression(node) {
+            // Grammar checking
+            // The identifier eval or arguments may not appear as the LeftHandSideExpression of an
+            // Assignment operator(11.13) or of a PostfixExpression(11.3) or as the UnaryExpression
+            // operated upon by a Prefix Increment(11.4.4) or a Prefix Decrement(11.4.5) operator.
+            if (inStrictMode) {
+                checkStrictModeEvalOrArguments(node, node.operand);
+            }
+        }
+        function checkStrictModePrefixUnaryExpression(node) {
+            // Grammar checking
+            if (inStrictMode) {
+                if (node.operator === 43 /* PlusPlusToken */ || node.operator === 44 /* MinusMinusToken */) {
+                    checkStrictModeEvalOrArguments(node, node.operand);
+                }
+            }
+        }
+        function checkStrictModeWithStatement(node) {
+            // Grammar checking for withStatement
+            if (inStrictMode) {
+                errorOnFirstToken(node, ts.Diagnostics.with_statements_are_not_allowed_in_strict_mode);
+            }
+        }
+        function errorOnFirstToken(node, message, arg0, arg1, arg2) {
+            var span = ts.getSpanOfTokenAtPosition(file, node.pos);
+            file.bindDiagnostics.push(ts.createFileDiagnostic(file, span.start, span.length, message, arg0, arg1, arg2));
+        }
+        function errorOrSuggestionOnFirstToken(isError, node, message, arg0, arg1, arg2) {
+            var span = ts.getSpanOfTokenAtPosition(file, node.pos);
+            var diag = ts.createFileDiagnostic(file, span.start, span.length, message, arg0, arg1, arg2);
+            if (isError) {
+                file.bindDiagnostics.push(diag);
+            }
+            else {
+                file.bindSuggestionDiagnostics = ts.append(file.bindSuggestionDiagnostics, __assign({}, diag, { category: ts.DiagnosticCategory.Suggestion }));
+            }
+        }
+        function bind(node) {
+            if (!node) {
+                return;
+            }
+            node.parent = parent;
+            var saveInStrictMode = inStrictMode;
+            // Even though in the AST the jsdoc @typedef node belongs to the current node,
+            // its symbol might be in the same scope with the current node's symbol. Consider:
+            //
+            //     /** @typedef {string | number} MyType */
+            //     function foo();
+            //
+            // Here the current node is "foo", which is a container, but the scope of "MyType" should
+            // not be inside "foo". Therefore we always bind @typedef before bind the parent node,
+            // and skip binding this tag later when binding all the other jsdoc tags.
+            // First we bind declaration nodes to a symbol if possible. We'll both create a symbol
+            // and then potentially add the symbol to an appropriate symbol table. Possible
+            // destination symbol tables are:
+            //
+            //  1) The 'exports' table of the current container's symbol.
+            //  2) The 'members' table of the current container's symbol.
+            //  3) The 'locals' table of the current container.
+            //
+            // However, not all symbols will end up in any of these tables. 'Anonymous' symbols
+            // (like TypeLiterals for example) will not be put in any table.
+            bindWorker(node);
+            // Then we recurse into the children of the node to bind them as well. For certain
+            // symbols we do specialized work when we recurse. For example, we'll keep track of
+            // the current 'container' node when it changes. This helps us know which symbol table
+            // a local should go into for example. Since terminal nodes are known not to have
+            // children, as an optimization we don't process those.
+            if (node.kind > 145 /* LastToken */) {
+                var saveParent = parent;
+                parent = node;
+                var containerFlags = getContainerFlags(node);
+                if (containerFlags === 0 /* None */) {
+                    bindChildren(node);
+                }
+                else {
+                    bindContainer(node, containerFlags);
+                }
+                parent = saveParent;
+            }
+            else if (!skipTransformFlagAggregation && (node.transformFlags & 536870912 /* HasComputedFlags */) === 0) {
+                subtreeTransformFlags |= computeTransformFlagsForNode(node, 0);
+                bindJSDoc(node);
+            }
+            inStrictMode = saveInStrictMode;
+        }
+        function bindJSDoc(node) {
+            if (ts.hasJSDocNodes(node)) {
+                if (ts.isInJavaScriptFile(node)) {
+                    for (var _i = 0, _a = node.jsDoc; _i < _a.length; _i++) {
+                        var j = _a[_i];
+                        bind(j);
+                    }
+                }
+                else {
+                    for (var _b = 0, _c = node.jsDoc; _b < _c.length; _b++) {
+                        var j = _c[_b];
+                        setParentPointers(node, j);
+                    }
+                }
+            }
+        }
+        function updateStrictModeStatementList(statements) {
+            if (!inStrictMode) {
+                for (var _i = 0, statements_1 = statements; _i < statements_1.length; _i++) {
+                    var statement = statements_1[_i];
+                    if (!ts.isPrologueDirective(statement)) {
+                        return;
+                    }
+                    if (isUseStrictPrologueDirective(statement)) {
+                        inStrictMode = true;
+                        return;
+                    }
+                }
+            }
+        }
+        /// Should be called only on prologue directives (isPrologueDirective(node) should be true)
+        function isUseStrictPrologueDirective(node) {
+            var nodeText = ts.getSourceTextOfNodeFromSourceFile(file, node.expression);
+            // Note: the node text must be exactly "use strict" or 'use strict'.  It is not ok for the
+            // string to contain unicode escapes (as per ES5).
+            return nodeText === '"use strict"' || nodeText === "'use strict'";
+        }
+        function bindWorker(node) {
+            switch (node.kind) {
+                /* Strict mode checks */
+                case 71 /* Identifier */:
+                    // for typedef type names with namespaces, bind the new jsdoc type symbol here
+                    // because it requires all containing namespaces to be in effect, namely the
+                    // current "blockScopeContainer" needs to be set to its immediate namespace parent.
+                    if (node.isInJSDocNamespace) {
+                        var parentNode = node.parent;
+                        while (parentNode && !ts.isJSDocTypeAlias(parentNode)) {
+                            parentNode = parentNode.parent;
+                        }
+                        bindBlockScopedDeclaration(parentNode, 524288 /* TypeAlias */, 67901928 /* TypeAliasExcludes */);
+                        break;
+                    }
+                // falls through
+                case 99 /* ThisKeyword */:
+                    if (currentFlow && (ts.isExpression(node) || parent.kind === 271 /* ShorthandPropertyAssignment */)) {
+                        node.flowNode = currentFlow;
+                    }
+                    return checkStrictModeIdentifier(node);
+                case 185 /* PropertyAccessExpression */:
+                    if (currentFlow && isNarrowableReference(node)) {
+                        node.flowNode = currentFlow;
+                    }
+                    if (ts.isSpecialPropertyDeclaration(node)) {
+                        bindSpecialPropertyDeclaration(node);
+                    }
+                    break;
+                case 200 /* BinaryExpression */:
+                    var specialKind = ts.getSpecialPropertyAssignmentKind(node);
+                    switch (specialKind) {
+                        case 1 /* ExportsProperty */:
+                            bindExportsPropertyAssignment(node);
+                            break;
+                        case 2 /* ModuleExports */:
+                            bindModuleExportsAssignment(node);
+                            break;
+                        case 3 /* PrototypeProperty */:
+                            bindPrototypePropertyAssignment(node.left, node);
+                            break;
+                        case 6 /* Prototype */:
+                            bindPrototypeAssignment(node);
+                            break;
+                        case 4 /* ThisProperty */:
+                            bindThisPropertyAssignment(node);
+                            break;
+                        case 5 /* Property */:
+                            bindSpecialPropertyAssignment(node);
+                            break;
+                        case 0 /* None */:
+                            // Nothing to do
+                            break;
+                        default:
+                            ts.Debug.fail("Unknown special property assignment kind");
+                    }
+                    return checkStrictModeBinaryExpression(node);
+                case 269 /* CatchClause */:
+                    return checkStrictModeCatchClause(node);
+                case 194 /* DeleteExpression */:
+                    return checkStrictModeDeleteExpression(node);
+                case 8 /* NumericLiteral */:
+                    return checkStrictModeNumericLiteral(node);
+                case 199 /* PostfixUnaryExpression */:
+                    return checkStrictModePostfixUnaryExpression(node);
+                case 198 /* PrefixUnaryExpression */:
+                    return checkStrictModePrefixUnaryExpression(node);
+                case 226 /* WithStatement */:
+                    return checkStrictModeWithStatement(node);
+                case 174 /* ThisType */:
+                    seenThisKeyword = true;
+                    return;
+                case 161 /* TypePredicate */:
+                    break; // Binding the children will handle everything
+                case 148 /* TypeParameter */:
+                    return bindTypeParameter(node);
+                case 149 /* Parameter */:
+                    return bindParameter(node);
+                case 232 /* VariableDeclaration */:
+                    return bindVariableDeclarationOrBindingElement(node);
+                case 182 /* BindingElement */:
+                    node.flowNode = currentFlow;
+                    return bindVariableDeclarationOrBindingElement(node);
+                case 152 /* PropertyDeclaration */:
+                case 151 /* PropertySignature */:
+                    return bindPropertyWorker(node);
+                case 270 /* PropertyAssignment */:
+                case 271 /* ShorthandPropertyAssignment */:
+                    return bindPropertyOrMethodOrAccessor(node, 4 /* Property */, 0 /* PropertyExcludes */);
+                case 273 /* EnumMember */:
+                    return bindPropertyOrMethodOrAccessor(node, 8 /* EnumMember */, 68008959 /* EnumMemberExcludes */);
+                case 158 /* CallSignature */:
+                case 159 /* ConstructSignature */:
+                case 160 /* IndexSignature */:
+                    return declareSymbolAndAddToSymbolTable(node, 131072 /* Signature */, 0 /* None */);
+                case 154 /* MethodDeclaration */:
+                case 153 /* MethodSignature */:
+                    // If this is an ObjectLiteralExpression method, then it sits in the same space
+                    // as other properties in the object literal.  So we use SymbolFlags.PropertyExcludes
+                    // so that it will conflict with any other object literal members with the same
+                    // name.
+                    return bindPropertyOrMethodOrAccessor(node, 8192 /* Method */ | (node.questionToken ? 16777216 /* Optional */ : 0 /* None */), ts.isObjectLiteralMethod(node) ? 0 /* PropertyExcludes */ : 67208127 /* MethodExcludes */);
+                case 234 /* FunctionDeclaration */:
+                    return bindFunctionDeclaration(node);
+                case 155 /* Constructor */:
+                    return declareSymbolAndAddToSymbolTable(node, 16384 /* Constructor */, /*symbolExcludes:*/ 0 /* None */);
+                case 156 /* GetAccessor */:
+                    return bindPropertyOrMethodOrAccessor(node, 32768 /* GetAccessor */, 67150783 /* GetAccessorExcludes */);
+                case 157 /* SetAccessor */:
+                    return bindPropertyOrMethodOrAccessor(node, 65536 /* SetAccessor */, 67183551 /* SetAccessorExcludes */);
+                case 163 /* FunctionType */:
+                case 284 /* JSDocFunctionType */:
+                case 288 /* JSDocSignature */:
+                case 164 /* ConstructorType */:
+                    return bindFunctionOrConstructorType(node);
+                case 166 /* TypeLiteral */:
+                case 287 /* JSDocTypeLiteral */:
+                case 177 /* MappedType */:
+                    return bindAnonymousTypeWorker(node);
+                case 184 /* ObjectLiteralExpression */:
+                    return bindObjectLiteralExpression(node);
+                case 192 /* FunctionExpression */:
+                case 193 /* ArrowFunction */:
+                    return bindFunctionExpression(node);
+                case 187 /* CallExpression */:
+                    if (ts.isInJavaScriptFile(node)) {
+                        bindCallExpression(node);
+                    }
+                    break;
+                // Members of classes, interfaces, and modules
+                case 205 /* ClassExpression */:
+                case 235 /* ClassDeclaration */:
+                    // All classes are automatically in strict mode in ES6.
+                    inStrictMode = true;
+                    return bindClassLikeDeclaration(node);
+                case 236 /* InterfaceDeclaration */:
+                    return bindBlockScopedDeclaration(node, 64 /* Interface */, 67901832 /* InterfaceExcludes */);
+                case 237 /* TypeAliasDeclaration */:
+                    return bindBlockScopedDeclaration(node, 524288 /* TypeAlias */, 67901928 /* TypeAliasExcludes */);
+                case 238 /* EnumDeclaration */:
+                    return bindEnumDeclaration(node);
+                case 239 /* ModuleDeclaration */:
+                    return bindModuleDeclaration(node);
+                // Jsx-attributes
+                case 263 /* JsxAttributes */:
+                    return bindJsxAttributes(node);
+                case 262 /* JsxAttribute */:
+                    return bindJsxAttribute(node, 4 /* Property */, 0 /* PropertyExcludes */);
+                // Imports and exports
+                case 243 /* ImportEqualsDeclaration */:
+                case 246 /* NamespaceImport */:
+                case 248 /* ImportSpecifier */:
+                case 252 /* ExportSpecifier */:
+                    return declareSymbolAndAddToSymbolTable(node, 2097152 /* Alias */, 2097152 /* AliasExcludes */);
+                case 242 /* NamespaceExportDeclaration */:
+                    return bindNamespaceExportDeclaration(node);
+                case 245 /* ImportClause */:
+                    return bindImportClause(node);
+                case 250 /* ExportDeclaration */:
+                    return bindExportDeclaration(node);
+                case 249 /* ExportAssignment */:
+                    return bindExportAssignment(node);
+                case 274 /* SourceFile */:
+                    updateStrictModeStatementList(node.statements);
+                    return bindSourceFileIfExternalModule();
+                case 213 /* Block */:
+                    if (!ts.isFunctionLike(node.parent)) {
+                        return;
+                    }
+                // falls through
+                case 240 /* ModuleBlock */:
+                    return updateStrictModeStatementList(node.statements);
+                case 293 /* JSDocParameterTag */:
+                    if (node.parent.kind === 288 /* JSDocSignature */) {
+                        return bindParameter(node);
+                    }
+                    if (node.parent.kind !== 287 /* JSDocTypeLiteral */) {
+                        break;
+                    }
+                // falls through
+                case 298 /* JSDocPropertyTag */:
+                    var propTag = node;
+                    var flags = propTag.isBracketed || propTag.typeExpression && propTag.typeExpression.type.kind === 283 /* JSDocOptionalType */ ?
+                        4 /* Property */ | 16777216 /* Optional */ :
+                        4 /* Property */;
+                    return declareSymbolAndAddToSymbolTable(propTag, flags, 0 /* PropertyExcludes */);
+                case 297 /* JSDocTypedefTag */:
+                case 292 /* JSDocCallbackTag */:
+                    return (delayedTypeAliases || (delayedTypeAliases = [])).push(node);
+            }
+        }
+        function bindPropertyWorker(node) {
+            return bindPropertyOrMethodOrAccessor(node, 4 /* Property */ | (node.questionToken ? 16777216 /* Optional */ : 0 /* None */), 0 /* PropertyExcludes */);
+        }
+        function bindAnonymousTypeWorker(node) {
+            return bindAnonymousDeclaration(node, 2048 /* TypeLiteral */, "__type" /* Type */);
+        }
+        function bindSourceFileIfExternalModule() {
+            setExportContextFlag(file);
+            if (ts.isExternalModule(file)) {
+                bindSourceFileAsExternalModule();
+            }
+            else if (ts.isJsonSourceFile(file)) {
+                bindSourceFileAsExternalModule();
+                // Create symbol equivalent for the module.exports = {}
+                var originalSymbol = file.symbol;
+                declareSymbol(file.symbol.exports, file.symbol, file, 4 /* Property */, 67108863 /* All */);
+                file.symbol = originalSymbol;
+            }
+        }
+        function bindSourceFileAsExternalModule() {
+            bindAnonymousDeclaration(file, 512 /* ValueModule */, "\"" + ts.removeFileExtension(file.fileName) + "\"");
+        }
+        function bindExportAssignment(node) {
+            if (!container.symbol || !container.symbol.exports) {
+                // Export assignment in some sort of block construct
+                bindAnonymousDeclaration(node, 2097152 /* Alias */, getDeclarationName(node));
+            }
+            else {
+                var flags = node.kind === 249 /* ExportAssignment */ && ts.exportAssignmentIsAlias(node)
+                    // An export default clause with an EntityNameExpression or a class expression exports all meanings of that identifier or expression;
+                    ? 2097152 /* Alias */
+                    // An export default clause with any other expression exports a value
+                    : 4 /* Property */;
+                // If there is an `export default x;` alias declaration, can't `export default` anything else.
+                // (In contrast, you can still have `export default function f() {}` and `export default interface I {}`.)
+                declareSymbol(container.symbol.exports, container.symbol, node, flags, 67108863 /* All */);
+            }
+        }
+        function bindNamespaceExportDeclaration(node) {
+            if (node.modifiers && node.modifiers.length) {
+                file.bindDiagnostics.push(createDiagnosticForNode(node, ts.Diagnostics.Modifiers_cannot_appear_here));
+            }
+            if (node.parent.kind !== 274 /* SourceFile */) {
+                file.bindDiagnostics.push(createDiagnosticForNode(node, ts.Diagnostics.Global_module_exports_may_only_appear_at_top_level));
+                return;
+            }
+            else {
+                var parent_1 = node.parent;
+                if (!ts.isExternalModule(parent_1)) {
+                    file.bindDiagnostics.push(createDiagnosticForNode(node, ts.Diagnostics.Global_module_exports_may_only_appear_in_module_files));
+                    return;
+                }
+                if (!parent_1.isDeclarationFile) {
+                    file.bindDiagnostics.push(createDiagnosticForNode(node, ts.Diagnostics.Global_module_exports_may_only_appear_in_declaration_files));
+                    return;
+                }
+            }
+            file.symbol.globalExports = file.symbol.globalExports || ts.createSymbolTable();
+            declareSymbol(file.symbol.globalExports, file.symbol, node, 2097152 /* Alias */, 2097152 /* AliasExcludes */);
+        }
+        function bindExportDeclaration(node) {
+            if (!container.symbol || !container.symbol.exports) {
+                // Export * in some sort of block construct
+                bindAnonymousDeclaration(node, 8388608 /* ExportStar */, getDeclarationName(node));
+            }
+            else if (!node.exportClause) {
+                // All export * declarations are collected in an __export symbol
+                declareSymbol(container.symbol.exports, container.symbol, node, 8388608 /* ExportStar */, 0 /* None */);
+            }
+        }
+        function bindImportClause(node) {
+            if (node.name) {
+                declareSymbolAndAddToSymbolTable(node, 2097152 /* Alias */, 2097152 /* AliasExcludes */);
+            }
+        }
+        function setCommonJsModuleIndicator(node) {
+            if (!file.commonJsModuleIndicator) {
+                file.commonJsModuleIndicator = node;
+                if (!file.externalModuleIndicator) {
+                    bindSourceFileAsExternalModule();
+                }
+            }
+        }
+        function bindExportsPropertyAssignment(node) {
+            // When we create a property via 'exports.foo = bar', the 'exports.foo' property access
+            // expression is the declaration
+            setCommonJsModuleIndicator(node);
+            var lhs = node.left;
+            var symbol = forEachIdentifierInEntityName(lhs.expression, /*parent*/ undefined, function (id, symbol) {
+                if (symbol) {
+                    addDeclarationToSymbol(symbol, id, 1536 /* Module */ | 67108864 /* JSContainer */);
+                }
+                return symbol;
+            });
+            if (symbol) {
+                var flags = ts.isClassExpression(node.right) ?
+                    4 /* Property */ | 1048576 /* ExportValue */ | 32 /* Class */ :
+                    4 /* Property */ | 1048576 /* ExportValue */;
+                declareSymbol(symbol.exports, symbol, lhs, flags, 0 /* None */);
+            }
+        }
+        function bindModuleExportsAssignment(node) {
+            // A common practice in node modules is to set 'export = module.exports = {}', this ensures that 'exports'
+            // is still pointing to 'module.exports'.
+            // We do not want to consider this as 'export=' since a module can have only one of these.
+            // Similarly we do not want to treat 'module.exports = exports' as an 'export='.
+            var assignedExpression = ts.getRightMostAssignedExpression(node.right);
+            if (ts.isEmptyObjectLiteral(assignedExpression) || container === file && isExportsOrModuleExportsOrAlias(file, assignedExpression)) {
+                // Mark it as a module in case there are no other exports in the file
+                setCommonJsModuleIndicator(node);
+                return;
+            }
+            // 'module.exports = expr' assignment
+            setCommonJsModuleIndicator(node);
+            var flags = ts.exportAssignmentIsAlias(node)
+                ? 2097152 /* Alias */
+                : 4 /* Property */ | 1048576 /* ExportValue */ | 512 /* ValueModule */;
+            declareSymbol(file.symbol.exports, file.symbol, node, flags, 0 /* None */);
+        }
+        function bindThisPropertyAssignment(node) {
+            ts.Debug.assert(ts.isInJavaScriptFile(node));
+            var thisContainer = ts.getThisContainer(node, /*includeArrowFunctions*/ false);
+            switch (thisContainer.kind) {
+                case 234 /* FunctionDeclaration */:
+                case 192 /* FunctionExpression */:
+                    var constructorSymbol = thisContainer.symbol;
+                    // For `f.prototype.m = function() { this.x = 0; }`, `this.x = 0` should modify `f`'s members, not the function expression.
+                    if (ts.isBinaryExpression(thisContainer.parent) && thisContainer.parent.operatorToken.kind === 58 /* EqualsToken */) {
+                        var l = thisContainer.parent.left;
+                        if (ts.isPropertyAccessEntityNameExpression(l) && ts.isPrototypeAccess(l.expression)) {
+                            constructorSymbol = lookupSymbolForPropertyAccess(l.expression.expression, thisParentContainer);
+                        }
+                    }
+                    if (constructorSymbol) {
+                        // Declare a 'member' if the container is an ES5 class or ES6 constructor
+                        constructorSymbol.members = constructorSymbol.members || ts.createSymbolTable();
+                        // It's acceptable for multiple 'this' assignments of the same identifier to occur
+                        declareSymbol(constructorSymbol.members, constructorSymbol, node, 4 /* Property */, 0 /* PropertyExcludes */ & ~4 /* Property */);
+                    }
+                    break;
+                case 155 /* Constructor */:
+                case 152 /* PropertyDeclaration */:
+                case 154 /* MethodDeclaration */:
+                case 156 /* GetAccessor */:
+                case 157 /* SetAccessor */:
+                    // this.foo assignment in a JavaScript class
+                    // Bind this property to the containing class
+                    var containingClass = thisContainer.parent;
+                    var symbolTable = ts.hasModifier(thisContainer, 32 /* Static */) ? containingClass.symbol.exports : containingClass.symbol.members;
+                    declareSymbol(symbolTable, containingClass.symbol, node, 4 /* Property */, 0 /* None */, /*isReplaceableByMethod*/ true);
+                    break;
+                case 274 /* SourceFile */:
+                    // this.foo assignment in a source file
+                    // Do not bind. It would be nice to support this someday though.
+                    break;
+                default:
+                    ts.Debug.fail(ts.Debug.showSyntaxKind(thisContainer));
+            }
+        }
+        function bindSpecialPropertyDeclaration(node) {
+            if (node.expression.kind === 99 /* ThisKeyword */) {
+                bindThisPropertyAssignment(node);
+            }
+            else if (ts.isPropertyAccessEntityNameExpression(node) && node.parent.parent.kind === 274 /* SourceFile */) {
+                if (ts.isPrototypeAccess(node.expression)) {
+                    bindPrototypePropertyAssignment(node, node.parent);
+                }
+                else {
+                    bindStaticPropertyAssignment(node);
+                }
+            }
+        }
+        /** For `x.prototype = { p, ... }`, declare members p,... if `x` is function/class/{}, or not declared. */
+        function bindPrototypeAssignment(node) {
+            node.left.parent = node;
+            node.right.parent = node;
+            var lhs = node.left;
+            bindPropertyAssignment(lhs, lhs, /*isPrototypeProperty*/ false);
+        }
+        /**
+         * For `x.prototype.y = z`, declare a member `y` on `x` if `x` is a function or class, or not declared.
+         * Note that jsdoc preceding an ExpressionStatement like `x.prototype.y;` is also treated as a declaration.
+         */
+        function bindPrototypePropertyAssignment(lhs, parent) {
+            // Look up the function in the local scope, since prototype assignments should
+            // follow the function declaration
+            var classPrototype = lhs.expression;
+            var constructorFunction = classPrototype.expression;
+            // Fix up parent pointers since we're going to use these nodes before we bind into them
+            lhs.parent = parent;
+            constructorFunction.parent = classPrototype;
+            classPrototype.parent = lhs;
+            bindPropertyAssignment(constructorFunction, lhs, /*isPrototypeProperty*/ true);
+        }
+        function bindSpecialPropertyAssignment(node) {
+            var lhs = node.left;
+            // Fix up parent pointers since we're going to use these nodes before we bind into them
+            node.left.parent = node;
+            node.right.parent = node;
+            if (ts.isIdentifier(lhs.expression) && container === file && isNameOfExportsOrModuleExportsAliasDeclaration(file, lhs.expression)) {
+                // This can be an alias for the 'exports' or 'module.exports' names, e.g.
+                //    var util = module.exports;
+                //    util.property = function ...
+                bindExportsPropertyAssignment(node);
+            }
+            else {
+                bindStaticPropertyAssignment(lhs);
+            }
+        }
+        /**
+         * For nodes like `x.y = z`, declare a member 'y' on 'x' if x is a function (or IIFE) or class or {}, or not declared.
+         * Also works for expression statements preceded by JSDoc, like / ** @type number * / x.y;
+         */
+        function bindStaticPropertyAssignment(node) {
+            node.expression.parent = node;
+            bindPropertyAssignment(node.expression, node, /*isPrototypeProperty*/ false);
+        }
+        function bindPropertyAssignment(name, propertyAccess, isPrototypeProperty) {
+            var namespaceSymbol = lookupSymbolForPropertyAccess(name);
+            var isToplevelNamespaceableInitializer = ts.isBinaryExpression(propertyAccess.parent)
+                ? getParentOfBinaryExpression(propertyAccess.parent).parent.kind === 274 /* SourceFile */ &&
+                    !!ts.getJavascriptInitializer(ts.getInitializerOfBinaryExpression(propertyAccess.parent), ts.isPrototypeAccess(propertyAccess.parent.left))
+                : propertyAccess.parent.parent.kind === 274 /* SourceFile */;
+            if (!isPrototypeProperty && (!namespaceSymbol || !(namespaceSymbol.flags & 1920 /* Namespace */)) && isToplevelNamespaceableInitializer) {
+                // make symbols or add declarations for intermediate containers
+                var flags_1 = 1536 /* Module */ | 67108864 /* JSContainer */;
+                var excludeFlags_1 = 67215503 /* ValueModuleExcludes */ & ~67108864 /* JSContainer */;
+                namespaceSymbol = forEachIdentifierInEntityName(propertyAccess.expression, namespaceSymbol, function (id, symbol, parent) {
+                    if (symbol) {
+                        addDeclarationToSymbol(symbol, id, flags_1);
+                        return symbol;
+                    }
+                    else {
+                        return declareSymbol(parent ? parent.exports : container.locals, parent, id, flags_1, excludeFlags_1);
+                    }
+                });
+            }
+            if (!namespaceSymbol || !isJavascriptContainer(namespaceSymbol)) {
+                return;
+            }
+            // Set up the members collection if it doesn't exist already
+            var symbolTable = isPrototypeProperty ?
+                (namespaceSymbol.members || (namespaceSymbol.members = ts.createSymbolTable())) :
+                (namespaceSymbol.exports || (namespaceSymbol.exports = ts.createSymbolTable()));
+            // Declare the method/property
+            var jsContainerFlag = isToplevelNamespaceableInitializer ? 67108864 /* JSContainer */ : 0;
+            var isMethod = ts.isFunctionLikeDeclaration(ts.getAssignedJavascriptInitializer(propertyAccess));
+            var symbolFlags = (isMethod ? 8192 /* Method */ : 4 /* Property */) | jsContainerFlag;
+            var symbolExcludes = (isMethod ? 67208127 /* MethodExcludes */ : 0 /* PropertyExcludes */) & ~jsContainerFlag;
+            declareSymbol(symbolTable, namespaceSymbol, propertyAccess, symbolFlags, symbolExcludes);
+        }
+        /**
+         * Javascript containers are:
+         * - Functions
+         * - classes
+         * - namespaces
+         * - variables initialized with function expressions
+         * -                       with class expressions
+         * -                       with empty object literals
+         * -                       with non-empty object literals if assigned to the prototype property
+         */
+        function isJavascriptContainer(symbol) {
+            if (symbol.flags & (16 /* Function */ | 32 /* Class */ | 1024 /* NamespaceModule */)) {
+                return true;
+            }
+            var node = symbol.valueDeclaration;
+            var init = !node ? undefined :
+                ts.isVariableDeclaration(node) ? node.initializer :
+                    ts.isBinaryExpression(node) ? node.right :
+                        ts.isPropertyAccessExpression(node) && ts.isBinaryExpression(node.parent) ? node.parent.right :
+                            undefined;
+            if (init) {
+                var isPrototypeAssignment = ts.isPrototypeAccess(ts.isVariableDeclaration(node) ? node.name : ts.isBinaryExpression(node) ? node.left : node);
+                return !!ts.getJavascriptInitializer(ts.isBinaryExpression(init) && init.operatorToken.kind === 54 /* BarBarToken */ ? init.right : init, isPrototypeAssignment);
+            }
+            return false;
+        }
+        function getParentOfBinaryExpression(expr) {
+            while (ts.isBinaryExpression(expr.parent)) {
+                expr = expr.parent;
+            }
+            return expr.parent;
+        }
+        function lookupSymbolForPropertyAccess(node, lookupContainer) {
+            if (lookupContainer === void 0) { lookupContainer = container; }
+            if (ts.isIdentifier(node)) {
+                return lookupSymbolForNameWorker(lookupContainer, node.escapedText);
+            }
+            else {
+                var symbol = lookupSymbolForPropertyAccess(node.expression);
+                return symbol && symbol.exports && symbol.exports.get(node.name.escapedText);
+            }
+        }
+        function forEachIdentifierInEntityName(e, parent, action) {
+            if (isExportsOrModuleExportsOrAlias(file, e)) {
+                return file.symbol;
+            }
+            else if (ts.isIdentifier(e)) {
+                return action(e, lookupSymbolForPropertyAccess(e), parent);
+            }
+            else {
+                var s = forEachIdentifierInEntityName(e.expression, parent, action);
+                if (!s || !s.exports)
+                    return ts.Debug.fail();
+                return action(e.name, s.exports.get(e.name.escapedText), s);
+            }
+        }
+        function bindCallExpression(node) {
+            // We're only inspecting call expressions to detect CommonJS modules, so we can skip
+            // this check if we've already seen the module indicator
+            if (!file.commonJsModuleIndicator && ts.isRequireCall(node, /*checkArgumentIsStringLiteralLike*/ false)) {
+                setCommonJsModuleIndicator(node);
+            }
+        }
+        function bindClassLikeDeclaration(node) {
+            if (node.kind === 235 /* ClassDeclaration */) {
+                bindBlockScopedDeclaration(node, 32 /* Class */, 68008383 /* ClassExcludes */);
+            }
+            else {
+                var bindingName = node.name ? node.name.escapedText : "__class" /* Class */;
+                bindAnonymousDeclaration(node, 32 /* Class */, bindingName);
+                // Add name of class expression into the map for semantic classifier
+                if (node.name) {
+                    classifiableNames.set(node.name.escapedText, true);
+                }
+            }
+            var symbol = node.symbol;
+            // TypeScript 1.0 spec (April 2014): 8.4
+            // Every class automatically contains a static property member named 'prototype', the
+            // type of which is an instantiation of the class type with type Any supplied as a type
+            // argument for each type parameter. It is an error to explicitly declare a static
+            // property member with the name 'prototype'.
+            //
+            // Note: we check for this here because this class may be merging into a module.  The
+            // module might have an exported variable called 'prototype'.  We can't allow that as
+            // that would clash with the built-in 'prototype' for the class.
+            var prototypeSymbol = createSymbol(4 /* Property */ | 4194304 /* Prototype */, "prototype");
+            var symbolExport = symbol.exports.get(prototypeSymbol.escapedName);
+            if (symbolExport) {
+                if (node.name) {
+                    node.name.parent = node;
+                }
+                file.bindDiagnostics.push(createDiagnosticForNode(symbolExport.declarations[0], ts.Diagnostics.Duplicate_identifier_0, ts.symbolName(prototypeSymbol)));
+            }
+            symbol.exports.set(prototypeSymbol.escapedName, prototypeSymbol);
+            prototypeSymbol.parent = symbol;
+        }
+        function bindEnumDeclaration(node) {
+            return ts.isConst(node)
+                ? bindBlockScopedDeclaration(node, 128 /* ConstEnum */, 68008831 /* ConstEnumExcludes */)
+                : bindBlockScopedDeclaration(node, 256 /* RegularEnum */, 68008191 /* RegularEnumExcludes */);
+        }
+        function bindVariableDeclarationOrBindingElement(node) {
+            if (inStrictMode) {
+                checkStrictModeEvalOrArguments(node, node.name);
+            }
+            if (!ts.isBindingPattern(node.name)) {
+                if (ts.isBlockOrCatchScoped(node)) {
+                    bindBlockScopedVariableDeclaration(node);
+                }
+                else if (ts.isParameterDeclaration(node)) {
+                    // It is safe to walk up parent chain to find whether the node is a destructuring parameter declaration
+                    // because its parent chain has already been set up, since parents are set before descending into children.
+                    //
+                    // If node is a binding element in parameter declaration, we need to use ParameterExcludes.
+                    // Using ParameterExcludes flag allows the compiler to report an error on duplicate identifiers in Parameter Declaration
+                    // For example:
+                    //      function foo([a,a]) {} // Duplicate Identifier error
+                    //      function bar(a,a) {}   // Duplicate Identifier error, parameter declaration in this case is handled in bindParameter
+                    //                             // which correctly set excluded symbols
+                    declareSymbolAndAddToSymbolTable(node, 1 /* FunctionScopedVariable */, 67216319 /* ParameterExcludes */);
+                }
+                else {
+                    declareSymbolAndAddToSymbolTable(node, 1 /* FunctionScopedVariable */, 67216318 /* FunctionScopedVariableExcludes */);
+                }
+            }
+        }
+        function bindParameter(node) {
+            if (node.kind === 293 /* JSDocParameterTag */ && container.kind !== 288 /* JSDocSignature */) {
+                return;
+            }
+            if (inStrictMode && !(node.flags & 4194304 /* Ambient */)) {
+                // It is a SyntaxError if the identifier eval or arguments appears within a FormalParameterList of a
+                // strict mode FunctionLikeDeclaration or FunctionExpression(13.1)
+                checkStrictModeEvalOrArguments(node, node.name);
+            }
+            if (ts.isBindingPattern(node.name)) {
+                bindAnonymousDeclaration(node, 1 /* FunctionScopedVariable */, "__" + node.parent.parameters.indexOf(node));
+            }
+            else {
+                declareSymbolAndAddToSymbolTable(node, 1 /* FunctionScopedVariable */, 67216319 /* ParameterExcludes */);
+            }
+            // If this is a property-parameter, then also declare the property symbol into the
+            // containing class.
+            if (ts.isParameterPropertyDeclaration(node)) {
+                var classDeclaration = node.parent.parent;
+                declareSymbol(classDeclaration.symbol.members, classDeclaration.symbol, node, 4 /* Property */ | (node.questionToken ? 16777216 /* Optional */ : 0 /* None */), 0 /* PropertyExcludes */);
+            }
+        }
+        function bindFunctionDeclaration(node) {
+            if (!file.isDeclarationFile && !(node.flags & 4194304 /* Ambient */)) {
+                if (ts.isAsyncFunction(node)) {
+                    emitFlags |= 1024 /* HasAsyncFunctions */;
+                }
+            }
+            checkStrictModeFunctionName(node);
+            if (inStrictMode) {
+                checkStrictModeFunctionDeclaration(node);
+                bindBlockScopedDeclaration(node, 16 /* Function */, 67215791 /* FunctionExcludes */);
+            }
+            else {
+                declareSymbolAndAddToSymbolTable(node, 16 /* Function */, 67215791 /* FunctionExcludes */);
+            }
+        }
+        function bindFunctionExpression(node) {
+            if (!file.isDeclarationFile && !(node.flags & 4194304 /* Ambient */)) {
+                if (ts.isAsyncFunction(node)) {
+                    emitFlags |= 1024 /* HasAsyncFunctions */;
+                }
+            }
+            if (currentFlow) {
+                node.flowNode = currentFlow;
+            }
+            checkStrictModeFunctionName(node);
+            var bindingName = node.name ? node.name.escapedText : "__function" /* Function */;
+            return bindAnonymousDeclaration(node, 16 /* Function */, bindingName);
+        }
+        function bindPropertyOrMethodOrAccessor(node, symbolFlags, symbolExcludes) {
+            if (!file.isDeclarationFile && !(node.flags & 4194304 /* Ambient */) && ts.isAsyncFunction(node)) {
+                emitFlags |= 1024 /* HasAsyncFunctions */;
+            }
+            if (currentFlow && ts.isObjectLiteralOrClassExpressionMethod(node)) {
+                node.flowNode = currentFlow;
+            }
+            return ts.hasDynamicName(node)
+                ? bindAnonymousDeclaration(node, symbolFlags, "__computed" /* Computed */)
+                : declareSymbolAndAddToSymbolTable(node, symbolFlags, symbolExcludes);
+        }
+        function getInferTypeContainer(node) {
+            var extendsType = ts.findAncestor(node, function (n) { return n.parent && ts.isConditionalTypeNode(n.parent) && n.parent.extendsType === n; });
+            return extendsType && extendsType.parent;
+        }
+        function bindTypeParameter(node) {
+            if (ts.isJSDocTemplateTag(node.parent)) {
+                var container_1 = ts.find(node.parent.parent.tags, ts.isJSDocTypeAlias) || ts.getHostSignatureFromJSDoc(node.parent); // TODO: GH#18217
+                if (container_1) {
+                    if (!container_1.locals) {
+                        container_1.locals = ts.createSymbolTable();
+                    }
+                    declareSymbol(container_1.locals, /*parent*/ undefined, node, 262144 /* TypeParameter */, 67639784 /* TypeParameterExcludes */);
+                }
+                else {
+                    declareSymbolAndAddToSymbolTable(node, 262144 /* TypeParameter */, 67639784 /* TypeParameterExcludes */);
+                }
+            }
+            else if (node.parent.kind === 172 /* InferType */) {
+                var container_2 = getInferTypeContainer(node.parent);
+                if (container_2) {
+                    if (!container_2.locals) {
+                        container_2.locals = ts.createSymbolTable();
+                    }
+                    declareSymbol(container_2.locals, /*parent*/ undefined, node, 262144 /* TypeParameter */, 67639784 /* TypeParameterExcludes */);
+                }
+                else {
+                    bindAnonymousDeclaration(node, 262144 /* TypeParameter */, getDeclarationName(node)); // TODO: GH#18217
+                }
+            }
+            else {
+                declareSymbolAndAddToSymbolTable(node, 262144 /* TypeParameter */, 67639784 /* TypeParameterExcludes */);
+            }
+        }
+        // reachability checks
+        function shouldReportErrorOnModuleDeclaration(node) {
+            var instanceState = getModuleInstanceState(node);
+            return instanceState === 1 /* Instantiated */ || (instanceState === 2 /* ConstEnumOnly */ && !!options.preserveConstEnums);
+        }
+        function checkUnreachable(node) {
+            if (!(currentFlow.flags & 1 /* Unreachable */)) {
+                return false;
+            }
+            if (currentFlow === unreachableFlow) {
+                var reportError = 
+                // report error on all statements except empty ones
+                (ts.isStatementButNotDeclaration(node) && node.kind !== 215 /* EmptyStatement */) ||
+                    // report error on class declarations
+                    node.kind === 235 /* ClassDeclaration */ ||
+                    // report error on instantiated modules or const-enums only modules if preserveConstEnums is set
+                    (node.kind === 239 /* ModuleDeclaration */ && shouldReportErrorOnModuleDeclaration(node)) ||
+                    // report error on regular enums and const enums if preserveConstEnums is set
+                    (node.kind === 238 /* EnumDeclaration */ && (!ts.isConstEnumDeclaration(node) || options.preserveConstEnums));
+                if (reportError) {
+                    currentFlow = reportedUnreachableFlow;
+                    if (!options.allowUnreachableCode) {
+                        // unreachable code is reported if
+                        // - user has explicitly asked about it AND
+                        // - statement is in not ambient context (statements in ambient context is already an error
+                        //   so we should not report extras) AND
+                        //   - node is not variable statement OR
+                        //   - node is block scoped variable statement OR
+                        //   - node is not block scoped variable statement and at least one variable declaration has initializer
+                        //   Rationale: we don't want to report errors on non-initialized var's since they are hoisted
+                        //   On the other side we do want to report errors on non-initialized 'lets' because of TDZ
+                        var isError = ts.unreachableCodeIsError(options) &&
+                            !(node.flags & 4194304 /* Ambient */) &&
+                            (!ts.isVariableStatement(node) ||
+                                !!(ts.getCombinedNodeFlags(node.declarationList) & 3 /* BlockScoped */) ||
+                                node.declarationList.declarations.some(function (d) { return !!d.initializer; }));
+                        errorOrSuggestionOnFirstToken(isError, node, ts.Diagnostics.Unreachable_code_detected);
+                    }
+                }
+            }
+            return true;
+        }
+    }
+    /* @internal */
+    function isExportsOrModuleExportsOrAlias(sourceFile, node) {
+        return ts.isExportsIdentifier(node) ||
+            ts.isModuleExportsPropertyAccessExpression(node) ||
+            ts.isIdentifier(node) && isNameOfExportsOrModuleExportsAliasDeclaration(sourceFile, node);
+    }
+    ts.isExportsOrModuleExportsOrAlias = isExportsOrModuleExportsOrAlias;
+    function isNameOfExportsOrModuleExportsAliasDeclaration(sourceFile, node) {
+        var symbol = lookupSymbolForNameWorker(sourceFile, node.escapedText);
+        return !!symbol && !!symbol.valueDeclaration && ts.isVariableDeclaration(symbol.valueDeclaration) &&
+            !!symbol.valueDeclaration.initializer && isExportsOrModuleExportsOrAliasOrAssignment(sourceFile, symbol.valueDeclaration.initializer);
+    }
+    function isExportsOrModuleExportsOrAliasOrAssignment(sourceFile, node) {
+        return isExportsOrModuleExportsOrAlias(sourceFile, node) ||
+            (ts.isAssignmentExpression(node, /*excludeCompoundAssignment*/ true) && (isExportsOrModuleExportsOrAliasOrAssignment(sourceFile, node.left) || isExportsOrModuleExportsOrAliasOrAssignment(sourceFile, node.right)));
+    }
+    function lookupSymbolForNameWorker(container, name) {
+        var local = container.locals && container.locals.get(name);
+        if (local) {
+            return local.exportSymbol || local;
+        }
+        return container.symbol && container.symbol.exports && container.symbol.exports.get(name);
+    }
+    /**
+     * Computes the transform flags for a node, given the transform flags of its subtree
+     *
+     * @param node The node to analyze
+     * @param subtreeFlags Transform flags computed for this node's subtree
+     */
+    function computeTransformFlagsForNode(node, subtreeFlags) {
+        var kind = node.kind;
+        switch (kind) {
+            case 187 /* CallExpression */:
+                return computeCallExpression(node, subtreeFlags);
+            case 188 /* NewExpression */:
+                return computeNewExpression(node, subtreeFlags);
+            case 239 /* ModuleDeclaration */:
+                return computeModuleDeclaration(node, subtreeFlags);
+            case 191 /* ParenthesizedExpression */:
+                return computeParenthesizedExpression(node, subtreeFlags);
+            case 200 /* BinaryExpression */:
+                return computeBinaryExpression(node, subtreeFlags);
+            case 216 /* ExpressionStatement */:
+                return computeExpressionStatement(node, subtreeFlags);
+            case 149 /* Parameter */:
+                return computeParameter(node, subtreeFlags);
+            case 193 /* ArrowFunction */:
+                return computeArrowFunction(node, subtreeFlags);
+            case 192 /* FunctionExpression */:
+                return computeFunctionExpression(node, subtreeFlags);
+            case 234 /* FunctionDeclaration */:
+                return computeFunctionDeclaration(node, subtreeFlags);
+            case 232 /* VariableDeclaration */:
+                return computeVariableDeclaration(node, subtreeFlags);
+            case 233 /* VariableDeclarationList */:
+                return computeVariableDeclarationList(node, subtreeFlags);
+            case 214 /* VariableStatement */:
+                return computeVariableStatement(node, subtreeFlags);
+            case 228 /* LabeledStatement */:
+                return computeLabeledStatement(node, subtreeFlags);
+            case 235 /* ClassDeclaration */:
+                return computeClassDeclaration(node, subtreeFlags);
+            case 205 /* ClassExpression */:
+                return computeClassExpression(node, subtreeFlags);
+            case 268 /* HeritageClause */:
+                return computeHeritageClause(node, subtreeFlags);
+            case 269 /* CatchClause */:
+                return computeCatchClause(node, subtreeFlags);
+            case 207 /* ExpressionWithTypeArguments */:
+                return computeExpressionWithTypeArguments(node, subtreeFlags);
+            case 155 /* Constructor */:
+                return computeConstructor(node, subtreeFlags);
+            case 152 /* PropertyDeclaration */:
+                return computePropertyDeclaration(node, subtreeFlags);
+            case 154 /* MethodDeclaration */:
+                return computeMethod(node, subtreeFlags);
+            case 156 /* GetAccessor */:
+            case 157 /* SetAccessor */:
+                return computeAccessor(node, subtreeFlags);
+            case 243 /* ImportEqualsDeclaration */:
+                return computeImportEquals(node, subtreeFlags);
+            case 185 /* PropertyAccessExpression */:
+                return computePropertyAccess(node, subtreeFlags);
+            case 186 /* ElementAccessExpression */:
+                return computeElementAccess(node, subtreeFlags);
+            default:
+                return computeOther(node, kind, subtreeFlags);
+        }
+    }
+    ts.computeTransformFlagsForNode = computeTransformFlagsForNode;
+    function computeCallExpression(node, subtreeFlags) {
+        var transformFlags = subtreeFlags;
+        var expression = node.expression;
+        if (node.typeArguments) {
+            transformFlags |= 3 /* AssertTypeScript */;
+        }
+        if (subtreeFlags & 524288 /* ContainsSpread */
+            || (expression.transformFlags & (134217728 /* Super */ | 268435456 /* ContainsSuper */))) {
+            // If the this node contains a SpreadExpression, or is a super call, then it is an ES6
+            // node.
+            transformFlags |= 192 /* AssertES2015 */;
+            // super property or element accesses could be inside lambdas, etc, and need a captured `this`,
+            // while super keyword for super calls (indicated by TransformFlags.Super) does not (since it can only be top-level in a constructor)
+            if (expression.transformFlags & 268435456 /* ContainsSuper */) {
+                transformFlags |= 16384 /* ContainsLexicalThis */;
+            }
+        }
+        if (expression.kind === 91 /* ImportKeyword */) {
+            transformFlags |= 67108864 /* ContainsDynamicImport */;
+            // A dynamic 'import()' call that contains a lexical 'this' will
+            // require a captured 'this' when emitting down-level.
+            if (subtreeFlags & 16384 /* ContainsLexicalThis */) {
+                transformFlags |= 32768 /* ContainsCapturedLexicalThis */;
+            }
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~940049729 /* ArrayLiteralOrCallOrNewExcludes */;
+    }
+    function computeNewExpression(node, subtreeFlags) {
+        var transformFlags = subtreeFlags;
+        if (node.typeArguments) {
+            transformFlags |= 3 /* AssertTypeScript */;
+        }
+        if (subtreeFlags & 524288 /* ContainsSpread */) {
+            // If the this node contains a SpreadElementExpression then it is an ES6
+            // node.
+            transformFlags |= 192 /* AssertES2015 */;
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~940049729 /* ArrayLiteralOrCallOrNewExcludes */;
+    }
+    function computeBinaryExpression(node, subtreeFlags) {
+        var transformFlags = subtreeFlags;
+        var operatorTokenKind = node.operatorToken.kind;
+        var leftKind = node.left.kind;
+        if (operatorTokenKind === 58 /* EqualsToken */ && leftKind === 184 /* ObjectLiteralExpression */) {
+            // Destructuring object assignments with are ES2015 syntax
+            // and possibly ESNext if they contain rest
+            transformFlags |= 8 /* AssertESNext */ | 192 /* AssertES2015 */ | 3072 /* AssertDestructuringAssignment */;
+        }
+        else if (operatorTokenKind === 58 /* EqualsToken */ && leftKind === 183 /* ArrayLiteralExpression */) {
+            // Destructuring assignments are ES2015 syntax.
+            transformFlags |= 192 /* AssertES2015 */ | 3072 /* AssertDestructuringAssignment */;
+        }
+        else if (operatorTokenKind === 40 /* AsteriskAsteriskToken */
+            || operatorTokenKind === 62 /* AsteriskAsteriskEqualsToken */) {
+            // Exponentiation is ES2016 syntax.
+            transformFlags |= 32 /* AssertES2016 */;
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~939525441 /* NodeExcludes */;
+    }
+    function computeParameter(node, subtreeFlags) {
+        var transformFlags = subtreeFlags;
+        var name = node.name;
+        var initializer = node.initializer;
+        var dotDotDotToken = node.dotDotDotToken;
+        // The '?' token, type annotations, decorators, and 'this' parameters are TypeSCript
+        // syntax.
+        if (node.questionToken
+            || node.type
+            || subtreeFlags & 4096 /* ContainsDecorators */
+            || ts.isThisIdentifier(name)) {
+            transformFlags |= 3 /* AssertTypeScript */;
+        }
+        // If a parameter has an accessibility modifier, then it is TypeScript syntax.
+        if (ts.hasModifier(node, 92 /* ParameterPropertyModifier */)) {
+            transformFlags |= 3 /* AssertTypeScript */ | 262144 /* ContainsParameterPropertyAssignments */;
+        }
+        // parameters with object rest destructuring are ES Next syntax
+        if (subtreeFlags & 1048576 /* ContainsObjectRest */) {
+            transformFlags |= 8 /* AssertESNext */;
+        }
+        // If a parameter has an initializer, a binding pattern or a dotDotDot token, then
+        // it is ES6 syntax and its container must emit default value assignments or parameter destructuring downlevel.
+        if (subtreeFlags & 8388608 /* ContainsBindingPattern */ || initializer || dotDotDotToken) {
+            transformFlags |= 192 /* AssertES2015 */ | 131072 /* ContainsDefaultValueAssignments */;
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~939525441 /* ParameterExcludes */;
+    }
+    function computeParenthesizedExpression(node, subtreeFlags) {
+        var transformFlags = subtreeFlags;
+        var expression = node.expression;
+        var expressionKind = expression.kind;
+        var expressionTransformFlags = expression.transformFlags;
+        // If the node is synthesized, it means the emitter put the parentheses there,
+        // not the user. If we didn't want them, the emitter would not have put them
+        // there.
+        if (expressionKind === 208 /* AsExpression */
+            || expressionKind === 190 /* TypeAssertionExpression */) {
+            transformFlags |= 3 /* AssertTypeScript */;
+        }
+        // If the expression of a ParenthesizedExpression is a destructuring assignment,
+        // then the ParenthesizedExpression is a destructuring assignment.
+        if (expressionTransformFlags & 1024 /* DestructuringAssignment */) {
+            transformFlags |= 1024 /* DestructuringAssignment */;
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~536872257 /* OuterExpressionExcludes */;
+    }
+    function computeClassDeclaration(node, subtreeFlags) {
+        var transformFlags;
+        if (ts.hasModifier(node, 2 /* Ambient */)) {
+            // An ambient declaration is TypeScript syntax.
+            transformFlags = 3 /* AssertTypeScript */;
+        }
+        else {
+            // A ClassDeclaration is ES6 syntax.
+            transformFlags = subtreeFlags | 192 /* AssertES2015 */;
+            // A class with a parameter property assignment, property initializer, computed property name, or decorator is
+            // TypeScript syntax.
+            // An exported declaration may be TypeScript syntax, but is handled by the visitor
+            // for a namespace declaration.
+            if ((subtreeFlags & 274432 /* TypeScriptClassSyntaxMask */)
+                || node.typeParameters) {
+                transformFlags |= 3 /* AssertTypeScript */;
+            }
+            if (subtreeFlags & 65536 /* ContainsLexicalThisInComputedPropertyName */) {
+                // A computed property name containing `this` might need to be rewritten,
+                // so propagate the ContainsLexicalThis flag upward.
+                transformFlags |= 16384 /* ContainsLexicalThis */;
+            }
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~942011713 /* ClassExcludes */;
+    }
+    function computeClassExpression(node, subtreeFlags) {
+        // A ClassExpression is ES6 syntax.
+        var transformFlags = subtreeFlags | 192 /* AssertES2015 */;
+        // A class with a parameter property assignment, property initializer, or decorator is
+        // TypeScript syntax.
+        if (subtreeFlags & 274432 /* TypeScriptClassSyntaxMask */
+            || node.typeParameters) {
+            transformFlags |= 3 /* AssertTypeScript */;
+        }
+        if (subtreeFlags & 65536 /* ContainsLexicalThisInComputedPropertyName */) {
+            // A computed property name containing `this` might need to be rewritten,
+            // so propagate the ContainsLexicalThis flag upward.
+            transformFlags |= 16384 /* ContainsLexicalThis */;
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~942011713 /* ClassExcludes */;
+    }
+    function computeHeritageClause(node, subtreeFlags) {
+        var transformFlags = subtreeFlags;
+        switch (node.token) {
+            case 85 /* ExtendsKeyword */:
+                // An `extends` HeritageClause is ES6 syntax.
+                transformFlags |= 192 /* AssertES2015 */;
+                break;
+            case 108 /* ImplementsKeyword */:
+                // An `implements` HeritageClause is TypeScript syntax.
+                transformFlags |= 3 /* AssertTypeScript */;
+                break;
+            default:
+                ts.Debug.fail("Unexpected token for heritage clause");
+                break;
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~939525441 /* NodeExcludes */;
+    }
+    function computeCatchClause(node, subtreeFlags) {
+        var transformFlags = subtreeFlags;
+        if (!node.variableDeclaration) {
+            transformFlags |= 8 /* AssertESNext */;
+        }
+        else if (ts.isBindingPattern(node.variableDeclaration.name)) {
+            transformFlags |= 192 /* AssertES2015 */;
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~940574017 /* CatchClauseExcludes */;
+    }
+    function computeExpressionWithTypeArguments(node, subtreeFlags) {
+        // An ExpressionWithTypeArguments is ES6 syntax, as it is used in the
+        // extends clause of a class.
+        var transformFlags = subtreeFlags | 192 /* AssertES2015 */;
+        // If an ExpressionWithTypeArguments contains type arguments, then it
+        // is TypeScript syntax.
+        if (node.typeArguments) {
+            transformFlags |= 3 /* AssertTypeScript */;
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~939525441 /* NodeExcludes */;
+    }
+    function computeConstructor(node, subtreeFlags) {
+        var transformFlags = subtreeFlags;
+        // TypeScript-specific modifiers and overloads are TypeScript syntax
+        if (ts.hasModifier(node, 2270 /* TypeScriptModifier */)
+            || !node.body) {
+            transformFlags |= 3 /* AssertTypeScript */;
+        }
+        // function declarations with object rest destructuring are ES Next syntax
+        if (subtreeFlags & 1048576 /* ContainsObjectRest */) {
+            transformFlags |= 8 /* AssertESNext */;
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~1003668801 /* ConstructorExcludes */;
+    }
+    function computeMethod(node, subtreeFlags) {
+        // A MethodDeclaration is ES6 syntax.
+        var transformFlags = subtreeFlags | 192 /* AssertES2015 */;
+        // Decorators, TypeScript-specific modifiers, type parameters, type annotations, and
+        // overloads are TypeScript syntax.
+        if (node.decorators
+            || ts.hasModifier(node, 2270 /* TypeScriptModifier */)
+            || node.typeParameters
+            || node.type
+            || (node.name && ts.isComputedPropertyName(node.name)) // While computed method names aren't typescript, the TS transform must visit them to emit property declarations correctly
+            || !node.body) {
+            transformFlags |= 3 /* AssertTypeScript */;
+        }
+        // function declarations with object rest destructuring are ES Next syntax
+        if (subtreeFlags & 1048576 /* ContainsObjectRest */) {
+            transformFlags |= 8 /* AssertESNext */;
+        }
+        // An async method declaration is ES2017 syntax.
+        if (ts.hasModifier(node, 256 /* Async */)) {
+            transformFlags |= node.asteriskToken ? 8 /* AssertESNext */ : 16 /* AssertES2017 */;
+        }
+        if (node.asteriskToken) {
+            transformFlags |= 768 /* AssertGenerator */;
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~1003668801 /* MethodOrAccessorExcludes */;
+    }
+    function computeAccessor(node, subtreeFlags) {
+        var transformFlags = subtreeFlags;
+        // Decorators, TypeScript-specific modifiers, type annotations, and overloads are
+        // TypeScript syntax.
+        if (node.decorators
+            || ts.hasModifier(node, 2270 /* TypeScriptModifier */)
+            || node.type
+            || (node.name && ts.isComputedPropertyName(node.name)) // While computed accessor names aren't typescript, the TS transform must visit them to emit property declarations correctly
+            || !node.body) {
+            transformFlags |= 3 /* AssertTypeScript */;
+        }
+        // function declarations with object rest destructuring are ES Next syntax
+        if (subtreeFlags & 1048576 /* ContainsObjectRest */) {
+            transformFlags |= 8 /* AssertESNext */;
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~1003668801 /* MethodOrAccessorExcludes */;
+    }
+    function computePropertyDeclaration(node, subtreeFlags) {
+        // A PropertyDeclaration is TypeScript syntax.
+        var transformFlags = subtreeFlags | 3 /* AssertTypeScript */;
+        // If the PropertyDeclaration has an initializer or a computed name, we need to inform its ancestor
+        // so that it handle the transformation.
+        if (node.initializer || ts.isComputedPropertyName(node.name)) {
+            transformFlags |= 8192 /* ContainsPropertyInitializer */;
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~939525441 /* NodeExcludes */;
+    }
+    function computeFunctionDeclaration(node, subtreeFlags) {
+        var transformFlags;
+        var modifierFlags = ts.getModifierFlags(node);
+        var body = node.body;
+        if (!body || (modifierFlags & 2 /* Ambient */)) {
+            // An ambient declaration is TypeScript syntax.
+            // A FunctionDeclaration without a body is an overload and is TypeScript syntax.
+            transformFlags = 3 /* AssertTypeScript */;
+        }
+        else {
+            transformFlags = subtreeFlags | 33554432 /* ContainsHoistedDeclarationOrCompletion */;
+            // TypeScript-specific modifiers, type parameters, and type annotations are TypeScript
+            // syntax.
+            if (modifierFlags & 2270 /* TypeScriptModifier */
+                || node.typeParameters
+                || node.type) {
+                transformFlags |= 3 /* AssertTypeScript */;
+            }
+            // An async function declaration is ES2017 syntax.
+            if (modifierFlags & 256 /* Async */) {
+                transformFlags |= node.asteriskToken ? 8 /* AssertESNext */ : 16 /* AssertES2017 */;
+            }
+            // function declarations with object rest destructuring are ES Next syntax
+            if (subtreeFlags & 1048576 /* ContainsObjectRest */) {
+                transformFlags |= 8 /* AssertESNext */;
+            }
+            // If a FunctionDeclaration's subtree has marked the container as needing to capture the
+            // lexical this, or the function contains parameters with initializers, then this node is
+            // ES6 syntax.
+            if (subtreeFlags & 163840 /* ES2015FunctionSyntaxMask */) {
+                transformFlags |= 192 /* AssertES2015 */;
+            }
+            // If a FunctionDeclaration is generator function and is the body of a
+            // transformed async function, then this node can be transformed to a
+            // down-level generator.
+            // Currently we do not support transforming any other generator fucntions
+            // down level.
+            if (node.asteriskToken) {
+                transformFlags |= 768 /* AssertGenerator */;
+            }
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~1003935041 /* FunctionExcludes */;
+    }
+    function computeFunctionExpression(node, subtreeFlags) {
+        var transformFlags = subtreeFlags;
+        // TypeScript-specific modifiers, type parameters, and type annotations are TypeScript
+        // syntax.
+        if (ts.hasModifier(node, 2270 /* TypeScriptModifier */)
+            || node.typeParameters
+            || node.type) {
+            transformFlags |= 3 /* AssertTypeScript */;
+        }
+        // An async function expression is ES2017 syntax.
+        if (ts.hasModifier(node, 256 /* Async */)) {
+            transformFlags |= node.asteriskToken ? 8 /* AssertESNext */ : 16 /* AssertES2017 */;
+        }
+        // function expressions with object rest destructuring are ES Next syntax
+        if (subtreeFlags & 1048576 /* ContainsObjectRest */) {
+            transformFlags |= 8 /* AssertESNext */;
+        }
+        // If a FunctionExpression's subtree has marked the container as needing to capture the
+        // lexical this, or the function contains parameters with initializers, then this node is
+        // ES6 syntax.
+        if (subtreeFlags & 163840 /* ES2015FunctionSyntaxMask */) {
+            transformFlags |= 192 /* AssertES2015 */;
+        }
+        // If a FunctionExpression is generator function and is the body of a
+        // transformed async function, then this node can be transformed to a
+        // down-level generator.
+        if (node.asteriskToken) {
+            transformFlags |= 768 /* AssertGenerator */;
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~1003935041 /* FunctionExcludes */;
+    }
+    function computeArrowFunction(node, subtreeFlags) {
+        // An ArrowFunction is ES6 syntax, and excludes markers that should not escape the scope of an ArrowFunction.
+        var transformFlags = subtreeFlags | 192 /* AssertES2015 */;
+        // TypeScript-specific modifiers, type parameters, and type annotations are TypeScript
+        // syntax.
+        if (ts.hasModifier(node, 2270 /* TypeScriptModifier */)
+            || node.typeParameters
+            || node.type) {
+            transformFlags |= 3 /* AssertTypeScript */;
+        }
+        // An async arrow function is ES2017 syntax.
+        if (ts.hasModifier(node, 256 /* Async */)) {
+            transformFlags |= 16 /* AssertES2017 */;
+        }
+        // arrow functions with object rest destructuring are ES Next syntax
+        if (subtreeFlags & 1048576 /* ContainsObjectRest */) {
+            transformFlags |= 8 /* AssertESNext */;
+        }
+        // If an ArrowFunction contains a lexical this, its container must capture the lexical this.
+        if (subtreeFlags & 16384 /* ContainsLexicalThis */) {
+            transformFlags |= 32768 /* ContainsCapturedLexicalThis */;
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~1003902273 /* ArrowFunctionExcludes */;
+    }
+    function computePropertyAccess(node, subtreeFlags) {
+        var transformFlags = subtreeFlags;
+        // If a PropertyAccessExpression starts with a super keyword, then it is
+        // ES6 syntax, and requires a lexical `this` binding.
+        if (transformFlags & 134217728 /* Super */) {
+            transformFlags ^= 134217728 /* Super */;
+            transformFlags |= 268435456 /* ContainsSuper */;
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~671089985 /* PropertyAccessExcludes */;
+    }
+    function computeElementAccess(node, subtreeFlags) {
+        var transformFlags = subtreeFlags;
+        var expression = node.expression;
+        var expressionFlags = expression.transformFlags; // We do not want to aggregate flags from the argument expression for super/this capturing
+        // If an ElementAccessExpression starts with a super keyword, then it is
+        // ES6 syntax, and requires a lexical `this` binding.
+        if (expressionFlags & 134217728 /* Super */) {
+            transformFlags &= ~134217728 /* Super */;
+            transformFlags |= 268435456 /* ContainsSuper */;
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~671089985 /* PropertyAccessExcludes */;
+    }
+    function computeVariableDeclaration(node, subtreeFlags) {
+        var transformFlags = subtreeFlags;
+        transformFlags |= 192 /* AssertES2015 */ | 8388608 /* ContainsBindingPattern */;
+        // A VariableDeclaration containing ObjectRest is ESNext syntax
+        if (subtreeFlags & 1048576 /* ContainsObjectRest */) {
+            transformFlags |= 8 /* AssertESNext */;
+        }
+        // Type annotations are TypeScript syntax.
+        if (node.type) {
+            transformFlags |= 3 /* AssertTypeScript */;
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~939525441 /* NodeExcludes */;
+    }
+    function computeVariableStatement(node, subtreeFlags) {
+        var transformFlags;
+        var declarationListTransformFlags = node.declarationList.transformFlags;
+        // An ambient declaration is TypeScript syntax.
+        if (ts.hasModifier(node, 2 /* Ambient */)) {
+            transformFlags = 3 /* AssertTypeScript */;
+        }
+        else {
+            transformFlags = subtreeFlags;
+            if (declarationListTransformFlags & 8388608 /* ContainsBindingPattern */) {
+                transformFlags |= 192 /* AssertES2015 */;
+            }
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~939525441 /* NodeExcludes */;
+    }
+    function computeLabeledStatement(node, subtreeFlags) {
+        var transformFlags = subtreeFlags;
+        // A labeled statement containing a block scoped binding *may* need to be transformed from ES6.
+        if (subtreeFlags & 4194304 /* ContainsBlockScopedBinding */
+            && ts.isIterationStatement(node, /*lookInLabeledStatements*/ true)) {
+            transformFlags |= 192 /* AssertES2015 */;
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~939525441 /* NodeExcludes */;
+    }
+    function computeImportEquals(node, subtreeFlags) {
+        var transformFlags = subtreeFlags;
+        // An ImportEqualsDeclaration with a namespace reference is TypeScript.
+        if (!ts.isExternalModuleImportEqualsDeclaration(node)) {
+            transformFlags |= 3 /* AssertTypeScript */;
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~939525441 /* NodeExcludes */;
+    }
+    function computeExpressionStatement(node, subtreeFlags) {
+        var transformFlags = subtreeFlags;
+        // If the expression of an expression statement is a destructuring assignment,
+        // then we treat the statement as ES6 so that we can indicate that we do not
+        // need to hold on to the right-hand side.
+        if (node.expression.transformFlags & 1024 /* DestructuringAssignment */) {
+            transformFlags |= 192 /* AssertES2015 */;
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~939525441 /* NodeExcludes */;
+    }
+    function computeModuleDeclaration(node, subtreeFlags) {
+        var transformFlags = 3 /* AssertTypeScript */;
+        var modifierFlags = ts.getModifierFlags(node);
+        if ((modifierFlags & 2 /* Ambient */) === 0) {
+            transformFlags |= subtreeFlags;
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~977327425 /* ModuleExcludes */;
+    }
+    function computeVariableDeclarationList(node, subtreeFlags) {
+        var transformFlags = subtreeFlags | 33554432 /* ContainsHoistedDeclarationOrCompletion */;
+        if (subtreeFlags & 8388608 /* ContainsBindingPattern */) {
+            transformFlags |= 192 /* AssertES2015 */;
+        }
+        // If a VariableDeclarationList is `let` or `const`, then it is ES6 syntax.
+        if (node.flags & 3 /* BlockScoped */) {
+            transformFlags |= 192 /* AssertES2015 */ | 4194304 /* ContainsBlockScopedBinding */;
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~948962625 /* VariableDeclarationListExcludes */;
+    }
+    function computeOther(node, kind, subtreeFlags) {
+        // Mark transformations needed for each node
+        var transformFlags = subtreeFlags;
+        var excludeFlags = 939525441 /* NodeExcludes */;
+        switch (kind) {
+            case 120 /* AsyncKeyword */:
+            case 197 /* AwaitExpression */:
+                // async/await is ES2017 syntax, but may be ESNext syntax (for async generators)
+                transformFlags |= 8 /* AssertESNext */ | 16 /* AssertES2017 */;
+                break;
+            case 190 /* TypeAssertionExpression */:
+            case 208 /* AsExpression */:
+            case 301 /* PartiallyEmittedExpression */:
+                // These nodes are TypeScript syntax.
+                transformFlags |= 3 /* AssertTypeScript */;
+                excludeFlags = 536872257 /* OuterExpressionExcludes */;
+                break;
+            case 114 /* PublicKeyword */:
+            case 112 /* PrivateKeyword */:
+            case 113 /* ProtectedKeyword */:
+            case 117 /* AbstractKeyword */:
+            case 124 /* DeclareKeyword */:
+            case 76 /* ConstKeyword */:
+            case 238 /* EnumDeclaration */:
+            case 273 /* EnumMember */:
+            case 209 /* NonNullExpression */:
+            case 132 /* ReadonlyKeyword */:
+                // These nodes are TypeScript syntax.
+                transformFlags |= 3 /* AssertTypeScript */;
+                break;
+            case 255 /* JsxElement */:
+            case 256 /* JsxSelfClosingElement */:
+            case 257 /* JsxOpeningElement */:
+            case 10 /* JsxText */:
+            case 258 /* JsxClosingElement */:
+            case 259 /* JsxFragment */:
+            case 260 /* JsxOpeningFragment */:
+            case 261 /* JsxClosingFragment */:
+            case 262 /* JsxAttribute */:
+            case 263 /* JsxAttributes */:
+            case 264 /* JsxSpreadAttribute */:
+            case 265 /* JsxExpression */:
+                // These nodes are Jsx syntax.
+                transformFlags |= 4 /* AssertJsx */;
+                break;
+            case 13 /* NoSubstitutionTemplateLiteral */:
+            case 14 /* TemplateHead */:
+            case 15 /* TemplateMiddle */:
+            case 16 /* TemplateTail */:
+            case 202 /* TemplateExpression */:
+            case 189 /* TaggedTemplateExpression */:
+            case 271 /* ShorthandPropertyAssignment */:
+            case 115 /* StaticKeyword */:
+            case 210 /* MetaProperty */:
+                // These nodes are ES6 syntax.
+                transformFlags |= 192 /* AssertES2015 */;
+                break;
+            case 9 /* StringLiteral */:
+                if (node.hasExtendedUnicodeEscape) {
+                    transformFlags |= 192 /* AssertES2015 */;
+                }
+                break;
+            case 8 /* NumericLiteral */:
+                if (node.numericLiteralFlags & 384 /* BinaryOrOctalSpecifier */) {
+                    transformFlags |= 192 /* AssertES2015 */;
+                }
+                break;
+            case 222 /* ForOfStatement */:
+                // This node is either ES2015 syntax or ES2017 syntax (if it is a for-await-of).
+                if (node.awaitModifier) {
+                    transformFlags |= 8 /* AssertESNext */;
+                }
+                transformFlags |= 192 /* AssertES2015 */;
+                break;
+            case 203 /* YieldExpression */:
+                // This node is either ES2015 syntax (in a generator) or ES2017 syntax (in an async
+                // generator).
+                transformFlags |= 8 /* AssertESNext */ | 192 /* AssertES2015 */ | 16777216 /* ContainsYield */;
+                break;
+            case 119 /* AnyKeyword */:
+            case 134 /* NumberKeyword */:
+            case 131 /* NeverKeyword */:
+            case 135 /* ObjectKeyword */:
+            case 137 /* StringKeyword */:
+            case 122 /* BooleanKeyword */:
+            case 138 /* SymbolKeyword */:
+            case 105 /* VoidKeyword */:
+            case 148 /* TypeParameter */:
+            case 151 /* PropertySignature */:
+            case 153 /* MethodSignature */:
+            case 158 /* CallSignature */:
+            case 159 /* ConstructSignature */:
+            case 160 /* IndexSignature */:
+            case 161 /* TypePredicate */:
+            case 162 /* TypeReference */:
+            case 163 /* FunctionType */:
+            case 164 /* ConstructorType */:
+            case 165 /* TypeQuery */:
+            case 166 /* TypeLiteral */:
+            case 167 /* ArrayType */:
+            case 168 /* TupleType */:
+            case 169 /* UnionType */:
+            case 170 /* IntersectionType */:
+            case 171 /* ConditionalType */:
+            case 172 /* InferType */:
+            case 173 /* ParenthesizedType */:
+            case 236 /* InterfaceDeclaration */:
+            case 237 /* TypeAliasDeclaration */:
+            case 174 /* ThisType */:
+            case 175 /* TypeOperator */:
+            case 176 /* IndexedAccessType */:
+            case 177 /* MappedType */:
+            case 178 /* LiteralType */:
+            case 242 /* NamespaceExportDeclaration */:
+                // Types and signatures are TypeScript syntax, and exclude all other facts.
+                transformFlags = 3 /* AssertTypeScript */;
+                excludeFlags = -3 /* TypeExcludes */;
+                break;
+            case 147 /* ComputedPropertyName */:
+                // Even though computed property names are ES6, we don't treat them as such.
+                // This is so that they can flow through PropertyName transforms unaffected.
+                // Instead, we mark the container as ES6, so that it can properly handle the transform.
+                transformFlags |= 2097152 /* ContainsComputedPropertyName */;
+                if (subtreeFlags & 16384 /* ContainsLexicalThis */) {
+                    // A computed method name like `[this.getName()](x: string) { ... }` needs to
+                    // distinguish itself from the normal case of a method body containing `this`:
+                    // `this` inside a method doesn't need to be rewritten (the method provides `this`),
+                    // whereas `this` inside a computed name *might* need to be rewritten if the class/object
+                    // is inside an arrow function:
+                    // `_this = this; () => class K { [_this.getName()]() { ... } }`
+                    // To make this distinction, use ContainsLexicalThisInComputedPropertyName
+                    // instead of ContainsLexicalThis for computed property names
+                    transformFlags |= 65536 /* ContainsLexicalThisInComputedPropertyName */;
+                }
+                break;
+            case 204 /* SpreadElement */:
+                transformFlags |= 192 /* AssertES2015 */ | 524288 /* ContainsSpread */;
+                break;
+            case 272 /* SpreadAssignment */:
+                transformFlags |= 8 /* AssertESNext */ | 1048576 /* ContainsObjectSpread */;
+                break;
+            case 97 /* SuperKeyword */:
+                // This node is ES6 syntax.
+                transformFlags |= 192 /* AssertES2015 */ | 134217728 /* Super */;
+                excludeFlags = 536872257 /* OuterExpressionExcludes */; // must be set to persist `Super`
+                break;
+            case 99 /* ThisKeyword */:
+                // Mark this node and its ancestors as containing a lexical `this` keyword.
+                transformFlags |= 16384 /* ContainsLexicalThis */;
+                break;
+            case 180 /* ObjectBindingPattern */:
+                transformFlags |= 192 /* AssertES2015 */ | 8388608 /* ContainsBindingPattern */;
+                if (subtreeFlags & 524288 /* ContainsRest */) {
+                    transformFlags |= 8 /* AssertESNext */ | 1048576 /* ContainsObjectRest */;
+                }
+                excludeFlags = 940049729 /* BindingPatternExcludes */;
+                break;
+            case 181 /* ArrayBindingPattern */:
+                transformFlags |= 192 /* AssertES2015 */ | 8388608 /* ContainsBindingPattern */;
+                excludeFlags = 940049729 /* BindingPatternExcludes */;
+                break;
+            case 182 /* BindingElement */:
+                transformFlags |= 192 /* AssertES2015 */;
+                if (node.dotDotDotToken) {
+                    transformFlags |= 524288 /* ContainsRest */;
+                }
+                break;
+            case 150 /* Decorator */:
+                // This node is TypeScript syntax, and marks its container as also being TypeScript syntax.
+                transformFlags |= 3 /* AssertTypeScript */ | 4096 /* ContainsDecorators */;
+                break;
+            case 184 /* ObjectLiteralExpression */:
+                excludeFlags = 942740801 /* ObjectLiteralExcludes */;
+                if (subtreeFlags & 2097152 /* ContainsComputedPropertyName */) {
+                    // If an ObjectLiteralExpression contains a ComputedPropertyName, then it
+                    // is an ES6 node.
+                    transformFlags |= 192 /* AssertES2015 */;
+                }
+                if (subtreeFlags & 65536 /* ContainsLexicalThisInComputedPropertyName */) {
+                    // A computed property name containing `this` might need to be rewritten,
+                    // so propagate the ContainsLexicalThis flag upward.
+                    transformFlags |= 16384 /* ContainsLexicalThis */;
+                }
+                if (subtreeFlags & 1048576 /* ContainsObjectSpread */) {
+                    // If an ObjectLiteralExpression contains a spread element, then it
+                    // is an ES next node.
+                    transformFlags |= 8 /* AssertESNext */;
+                }
+                break;
+            case 183 /* ArrayLiteralExpression */:
+            case 188 /* NewExpression */:
+                excludeFlags = 940049729 /* ArrayLiteralOrCallOrNewExcludes */;
+                if (subtreeFlags & 524288 /* ContainsSpread */) {
+                    // If the this node contains a SpreadExpression, then it is an ES6
+                    // node.
+                    transformFlags |= 192 /* AssertES2015 */;
+                }
+                break;
+            case 218 /* DoStatement */:
+            case 219 /* WhileStatement */:
+            case 220 /* ForStatement */:
+            case 221 /* ForInStatement */:
+                // A loop containing a block scoped binding *may* need to be transformed from ES6.
+                if (subtreeFlags & 4194304 /* ContainsBlockScopedBinding */) {
+                    transformFlags |= 192 /* AssertES2015 */;
+                }
+                break;
+            case 274 /* SourceFile */:
+                if (subtreeFlags & 32768 /* ContainsCapturedLexicalThis */) {
+                    transformFlags |= 192 /* AssertES2015 */;
+                }
+                break;
+            case 225 /* ReturnStatement */:
+                // Return statements may require an `await` in ESNext.
+                transformFlags |= 33554432 /* ContainsHoistedDeclarationOrCompletion */ | 8 /* AssertESNext */;
+                break;
+            case 223 /* ContinueStatement */:
+            case 224 /* BreakStatement */:
+                transformFlags |= 33554432 /* ContainsHoistedDeclarationOrCompletion */;
+                break;
+        }
+        node.transformFlags = transformFlags | 536870912 /* HasComputedFlags */;
+        return transformFlags & ~excludeFlags;
+    }
+    /**
+     * Gets the transform flags to exclude when unioning the transform flags of a subtree.
+     *
+     * NOTE: This needs to be kept up-to-date with the exclusions used in `computeTransformFlagsForNode`.
+     *       For performance reasons, `computeTransformFlagsForNode` uses local constant values rather
+     *       than calling this function.
+     */
+    /* @internal */
+    function getTransformFlagsSubtreeExclusions(kind) {
+        if (kind >= 161 /* FirstTypeNode */ && kind <= 179 /* LastTypeNode */) {
+            return -3 /* TypeExcludes */;
+        }
+        switch (kind) {
+            case 187 /* CallExpression */:
+            case 188 /* NewExpression */:
+            case 183 /* ArrayLiteralExpression */:
+                return 940049729 /* ArrayLiteralOrCallOrNewExcludes */;
+            case 239 /* ModuleDeclaration */:
+                return 977327425 /* ModuleExcludes */;
+            case 149 /* Parameter */:
+                return 939525441 /* ParameterExcludes */;
+            case 193 /* ArrowFunction */:
+                return 1003902273 /* ArrowFunctionExcludes */;
+            case 192 /* FunctionExpression */:
+            case 234 /* FunctionDeclaration */:
+                return 1003935041 /* FunctionExcludes */;
+            case 233 /* VariableDeclarationList */:
+                return 948962625 /* VariableDeclarationListExcludes */;
+            case 235 /* ClassDeclaration */:
+            case 205 /* ClassExpression */:
+                return 942011713 /* ClassExcludes */;
+            case 155 /* Constructor */:
+                return 1003668801 /* ConstructorExcludes */;
+            case 154 /* MethodDeclaration */:
+            case 156 /* GetAccessor */:
+            case 157 /* SetAccessor */:
+                return 1003668801 /* MethodOrAccessorExcludes */;
+            case 119 /* AnyKeyword */:
+            case 134 /* NumberKeyword */:
+            case 131 /* NeverKeyword */:
+            case 137 /* StringKeyword */:
+            case 135 /* ObjectKeyword */:
+            case 122 /* BooleanKeyword */:
+            case 138 /* SymbolKeyword */:
+            case 105 /* VoidKeyword */:
+            case 148 /* TypeParameter */:
+            case 151 /* PropertySignature */:
+            case 153 /* MethodSignature */:
+            case 158 /* CallSignature */:
+            case 159 /* ConstructSignature */:
+            case 160 /* IndexSignature */:
+            case 236 /* InterfaceDeclaration */:
+            case 237 /* TypeAliasDeclaration */:
+                return -3 /* TypeExcludes */;
+            case 184 /* ObjectLiteralExpression */:
+                return 942740801 /* ObjectLiteralExcludes */;
+            case 269 /* CatchClause */:
+                return 940574017 /* CatchClauseExcludes */;
+            case 180 /* ObjectBindingPattern */:
+            case 181 /* ArrayBindingPattern */:
+                return 940049729 /* BindingPatternExcludes */;
+            case 190 /* TypeAssertionExpression */:
+            case 208 /* AsExpression */:
+            case 301 /* PartiallyEmittedExpression */:
+            case 191 /* ParenthesizedExpression */:
+            case 97 /* SuperKeyword */:
+                return 536872257 /* OuterExpressionExcludes */;
+            case 185 /* PropertyAccessExpression */:
+            case 186 /* ElementAccessExpression */:
+                return 671089985 /* PropertyAccessExcludes */;
+            default:
+                return 939525441 /* NodeExcludes */;
+        }
+    }
+    ts.getTransformFlagsSubtreeExclusions = getTransformFlagsSubtreeExclusions;
+    /**
+     * "Binds" JSDoc nodes in TypeScript code.
+     * Since we will never create symbols for JSDoc, we just set parent pointers instead.
+     */
+    function setParentPointers(parent, child) {
+        child.parent = parent;
+        ts.forEachChild(child, function (grandchild) { return setParentPointers(child, grandchild); });
+    }
+})(ts || (ts = {}));
+/** @internal */
+var ts;
+(function (ts) {
+    function createGetSymbolWalker(getRestTypeOfSignature, getTypePredicateOfSignature, getReturnTypeOfSignature, getBaseTypes, resolveStructuredTypeMembers, getTypeOfSymbol, getResolvedSymbol, getIndexTypeOfStructuredType, getConstraintFromTypeParameter, getFirstIdentifier) {
+        return getSymbolWalker;
+        function getSymbolWalker(accept) {
+            if (accept === void 0) { accept = function () { return true; }; }
+            var visitedTypes = []; // Sparse array from id to type
+            var visitedSymbols = []; // Sparse array from id to symbol
+            return {
+                walkType: function (type) {
+                    try {
+                        visitType(type);
+                        return { visitedTypes: ts.getOwnValues(visitedTypes), visitedSymbols: ts.getOwnValues(visitedSymbols) };
+                    }
+                    finally {
+                        ts.clear(visitedTypes);
+                        ts.clear(visitedSymbols);
+                    }
+                },
+                walkSymbol: function (symbol) {
+                    try {
+                        visitSymbol(symbol);
+                        return { visitedTypes: ts.getOwnValues(visitedTypes), visitedSymbols: ts.getOwnValues(visitedSymbols) };
+                    }
+                    finally {
+                        ts.clear(visitedTypes);
+                        ts.clear(visitedSymbols);
+                    }
+                },
+            };
+            function visitType(type) {
+                if (!type) {
+                    return;
+                }
+                if (visitedTypes[type.id]) {
+                    return;
+                }
+                visitedTypes[type.id] = type;
+                // Reuse visitSymbol to visit the type's symbol,
+                //  but be sure to bail on recuring into the type if accept declines the symbol.
+                var shouldBail = visitSymbol(type.symbol);
+                if (shouldBail)
+                    return;
+                // Visit the type's related types, if any
+                if (type.flags & 131072 /* Object */) {
+                    var objectType = type;
+                    var objectFlags = objectType.objectFlags;
+                    if (objectFlags & 4 /* Reference */) {
+                        visitTypeReference(type);
+                    }
+                    if (objectFlags & 32 /* Mapped */) {
+                        visitMappedType(type);
+                    }
+                    if (objectFlags & (1 /* Class */ | 2 /* Interface */)) {
+                        visitInterfaceType(type);
+                    }
+                    if (objectFlags & (8 /* Tuple */ | 16 /* Anonymous */)) {
+                        visitObjectType(objectType);
+                    }
+                }
+                if (type.flags & 65536 /* TypeParameter */) {
+                    visitTypeParameter(type);
+                }
+                if (type.flags & 786432 /* UnionOrIntersection */) {
+                    visitUnionOrIntersectionType(type);
+                }
+                if (type.flags & 1048576 /* Index */) {
+                    visitIndexType(type);
+                }
+                if (type.flags & 2097152 /* IndexedAccess */) {
+                    visitIndexedAccessType(type);
+                }
+            }
+            function visitTypeReference(type) {
+                visitType(type.target);
+                ts.forEach(type.typeArguments, visitType);
+            }
+            function visitTypeParameter(type) {
+                visitType(getConstraintFromTypeParameter(type));
+            }
+            function visitUnionOrIntersectionType(type) {
+                ts.forEach(type.types, visitType);
+            }
+            function visitIndexType(type) {
+                visitType(type.type);
+            }
+            function visitIndexedAccessType(type) {
+                visitType(type.objectType);
+                visitType(type.indexType);
+                visitType(type.constraint);
+            }
+            function visitMappedType(type) {
+                visitType(type.typeParameter);
+                visitType(type.constraintType);
+                visitType(type.templateType);
+                visitType(type.modifiersType);
+            }
+            function visitSignature(signature) {
+                var typePredicate = getTypePredicateOfSignature(signature);
+                if (typePredicate) {
+                    visitType(typePredicate.type);
+                }
+                ts.forEach(signature.typeParameters, visitType);
+                for (var _i = 0, _a = signature.parameters; _i < _a.length; _i++) {
+                    var parameter = _a[_i];
+                    visitSymbol(parameter);
+                }
+                visitType(getRestTypeOfSignature(signature));
+                visitType(getReturnTypeOfSignature(signature));
+            }
+            function visitInterfaceType(interfaceT) {
+                visitObjectType(interfaceT);
+                ts.forEach(interfaceT.typeParameters, visitType);
+                ts.forEach(getBaseTypes(interfaceT), visitType);
+                visitType(interfaceT.thisType);
+            }
+            function visitObjectType(type) {
+                var stringIndexType = getIndexTypeOfStructuredType(type, 0 /* String */);
+                visitType(stringIndexType);
+                var numberIndexType = getIndexTypeOfStructuredType(type, 1 /* Number */);
+                visitType(numberIndexType);
+                // The two checks above *should* have already resolved the type (if needed), so this should be cached
+                var resolved = resolveStructuredTypeMembers(type);
+                for (var _i = 0, _a = resolved.callSignatures; _i < _a.length; _i++) {
+                    var signature = _a[_i];
+                    visitSignature(signature);
+                }
+                for (var _b = 0, _c = resolved.constructSignatures; _b < _c.length; _b++) {
+                    var signature = _c[_b];
+                    visitSignature(signature);
+                }
+                for (var _d = 0, _e = resolved.properties; _d < _e.length; _d++) {
+                    var p = _e[_d];
+                    visitSymbol(p);
+                }
+            }
+            function visitSymbol(symbol) {
+                if (!symbol) {
+                    return false;
+                }
+                var symbolId = ts.getSymbolId(symbol);
+                if (visitedSymbols[symbolId]) {
+                    return false;
+                }
+                visitedSymbols[symbolId] = symbol;
+                if (!accept(symbol)) {
+                    return true;
+                }
+                var t = getTypeOfSymbol(symbol);
+                visitType(t); // Should handle members on classes and such
+                if (symbol.flags & 1952 /* HasExports */) {
+                    symbol.exports.forEach(visitSymbol);
+                }
+                ts.forEach(symbol.declarations, function (d) {
+                    // Type queries are too far resolved when we just visit the symbol's type
+                    //  (their type resolved directly to the member deeply referenced)
+                    // So to get the intervening symbols, we need to check if there's a type
+                    // query node on any of the symbol's declarations and get symbols there
+                    if (d.type && d.type.kind === 165 /* TypeQuery */) {
+                        var query = d.type;
+                        var entity = getResolvedSymbol(getFirstIdentifier(query.exprName));
+                        visitSymbol(entity);
+                    }
+                });
+                return false;
+            }
+        }
+    }
+    ts.createGetSymbolWalker = createGetSymbolWalker;
+})(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var ambientModuleSymbolRegex = /^".+"$/;
@@ -22807,17 +28979,28 @@ var ts;
     ts.getSymbolId = getSymbolId;
     function isInstantiatedModule(node, preserveConstEnums) {
         var moduleState = ts.getModuleInstanceState(node);
-        return moduleState === 1 ||
-            (preserveConstEnums && moduleState === 2);
+        return moduleState === 1 /* Instantiated */ ||
+            (preserveConstEnums && moduleState === 2 /* ConstEnumOnly */);
     }
     ts.isInstantiatedModule = isInstantiatedModule;
     function createTypeChecker(host, produceDiagnostics) {
+        // Cancellation that controls whether or not we can cancel in the middle of type checking.
+        // In general cancelling is *not* safe for the type checker.  We might be in the middle of
+        // computing something, and we will leave our internals in an inconsistent state.  Callers
+        // who set the cancellation token should catch if a cancellation exception occurs, and
+        // should throw away and create a new TypeChecker.
+        //
+        // Currently we only support setting the cancellation token when getting diagnostics.  This
+        // is because diagnostics can be quite expensive, and we want to allow hosts to bail out if
+        // they no longer need the information (for example, if the user started editing again).
         var cancellationToken;
         var requestedExternalEmitHelpers;
         var externalHelpersModule;
+        // tslint:disable variable-name
         var Symbol = ts.objectAllocator.getSymbolConstructor();
         var Type = ts.objectAllocator.getTypeConstructor();
         var Signature = ts.objectAllocator.getSignatureConstructor();
+        // tslint:enable variable-name
         var typeCount = 0;
         var symbolCount = 0;
         var enumCount = 0;
@@ -22836,12 +29019,18 @@ var ts;
         var keyofStringsOnly = !!compilerOptions.keyofStringsOnly;
         var emitResolver = createResolver();
         var nodeBuilder = createNodeBuilder();
-        var undefinedSymbol = createSymbol(4, "undefined");
+        var undefinedSymbol = createSymbol(4 /* Property */, "undefined");
         undefinedSymbol.declarations = [];
-        var argumentsSymbol = createSymbol(4, "arguments");
-        var requireSymbol = createSymbol(4, "require");
-        var moduleSymbol = createSymbol(4, "module");
+        var argumentsSymbol = createSymbol(4 /* Property */, "arguments");
+        var requireSymbol = createSymbol(4 /* Property */, "require");
+        var moduleSymbol = createSymbol(4 /* Property */, "module");
+        /** This will be set during calls to `getResolvedSignature` where services determines an apparent number of arguments greater than what is actually provided. */
         var apparentArgumentCount;
+        // for public members that accept a Node or one of its subtypes, we must guard against
+        // synthetic nodes created during transformations by calling `getParseTreeNode`.
+        // for most of these, we perform the guard only on `checker` to avoid any possible
+        // extra cost of calling `getParseTreeNode` when calling these functions from inside the
+        // checker.
         var checker = {
             getNodeCount: function () { return ts.sum(host.getSourceFiles(), "nodeCount"); },
             getIdentifierCount: function () { return ts.sum(host.getSourceFiles(), "identifierCount"); },
@@ -22984,13 +29173,13 @@ var ts;
                 return parsed ? isImplementationOfOverload(parsed) : undefined;
             },
             getImmediateAliasedSymbol: function (symbol) {
-                ts.Debug.assert((symbol.flags & 2097152) !== 0, "Should only get Alias here.");
+                ts.Debug.assert((symbol.flags & 2097152 /* Alias */) !== 0, "Should only get Alias here.");
                 var links = getSymbolLinks(symbol);
                 if (!links.immediateTarget) {
                     var node = getDeclarationOfAliasSymbol(symbol);
                     if (!node)
                         return ts.Debug.fail();
-                    links.immediateTarget = getTargetOfAliasDeclaration(node, true);
+                    links.immediateTarget = getTargetOfAliasDeclaration(node, /*dontRecursivelyResolve*/ true);
                 }
                 return links.immediateTarget;
             },
@@ -23012,7 +29201,9 @@ var ts;
             tryGetMemberInModuleExports: function (name, symbol) { return tryGetMemberInModuleExports(ts.escapeLeadingUnderscores(name), symbol); },
             tryGetMemberInModuleExportsAndProperties: function (name, symbol) { return tryGetMemberInModuleExportsAndProperties(ts.escapeLeadingUnderscores(name), symbol); },
             tryFindAmbientModuleWithoutAugmentations: function (moduleName) {
-                return tryFindAmbientModule(moduleName, false);
+                // we deliberately exclude augmentations
+                // since we are only interested in declarations of the module itself
+                return tryFindAmbientModule(moduleName, /*withAugmentations*/ false);
             },
             getApparentType: getApparentType,
             getUnionType: getUnionType,
@@ -23026,6 +29217,8 @@ var ts;
             createPromiseType: createPromiseType,
             createArrayType: createArrayType,
             getBooleanType: function () { return booleanType; },
+            getFalseType: function () { return falseType; },
+            getTrueType: function () { return trueType; },
             getVoidType: function () { return voidType; },
             getUndefinedType: function () { return undefinedType; },
             getNullType: function () { return nullType; },
@@ -23038,9 +29231,9 @@ var ts;
             getSuggestionForNonexistentSymbol: function (location, name, meaning) { return getSuggestionForNonexistentSymbol(location, ts.escapeLeadingUnderscores(name), meaning); },
             getSuggestionForNonexistentModule: function (node, target) { return getSuggestionForNonexistentModule(node, target); },
             getBaseConstraintOfType: getBaseConstraintOfType,
-            getDefaultFromTypeParameter: function (type) { return type && type.flags & 65536 ? getDefaultFromTypeParameter(type) : undefined; },
+            getDefaultFromTypeParameter: function (type) { return type && type.flags & 65536 /* TypeParameter */ ? getDefaultFromTypeParameter(type) : undefined; },
             resolveName: function (name, location, meaning, excludeGlobals) {
-                return resolveName(location, ts.escapeLeadingUnderscores(name), meaning, undefined, undefined, false, excludeGlobals);
+                return resolveName(location, ts.escapeLeadingUnderscores(name), meaning, /*nameNotFoundMessage*/ undefined, /*nameArg*/ undefined, /*isUse*/ false, excludeGlobals);
             },
             getJsxNamespace: function (n) { return ts.unescapeLeadingUnderscores(getJsxNamespace(n)); },
             getAccessibleSymbolChain: getAccessibleSymbolChain,
@@ -23057,11 +29250,15 @@ var ts;
             getSuggestionDiagnostics: function (file, ct) {
                 var diagnostics;
                 try {
+                    // Record the cancellation token so it can be checked later on during checkSourceElement.
+                    // Do this in a finally block so we can ensure that it gets reset back to nothing after
+                    // this call is done.
                     cancellationToken = ct;
+                    // Ensure file is type checked
                     checkSourceFile(file);
-                    ts.Debug.assert(!!(getNodeLinks(file).flags & 1));
+                    ts.Debug.assert(!!(getNodeLinks(file).flags & 1 /* TypeChecked */));
                     diagnostics = ts.addRange(diagnostics, suggestionDiagnostics.get(file.fileName));
-                    if (!file.isDeclarationFile && (!unusedIsError(0) || !unusedIsError(1))) {
+                    if (!file.isDeclarationFile && (!unusedIsError(0 /* Local */) || !unusedIsError(1 /* Parameter */))) {
                         addUnusedDiagnostics();
                     }
                     return diagnostics || ts.emptyArray;
@@ -23094,56 +29291,63 @@ var ts;
         var indexedAccessTypes = ts.createMap();
         var evolvingArrayTypes = [];
         var undefinedProperties = ts.createMap();
-        var unknownSymbol = createSymbol(4, "unknown");
-        var resolvingSymbol = createSymbol(0, "__resolving__");
-        var anyType = createIntrinsicType(1, "any");
-        var autoType = createIntrinsicType(1, "any");
-        var wildcardType = createIntrinsicType(1, "any");
-        var errorType = createIntrinsicType(1, "error");
-        var unknownType = createIntrinsicType(2, "unknown");
-        var undefinedType = createIntrinsicType(8192, "undefined");
-        var undefinedWideningType = strictNullChecks ? undefinedType : createIntrinsicType(8192 | 134217728, "undefined");
-        var nullType = createIntrinsicType(16384, "null");
-        var nullWideningType = strictNullChecks ? nullType : createIntrinsicType(16384 | 134217728, "null");
-        var stringType = createIntrinsicType(4, "string");
-        var numberType = createIntrinsicType(8, "number");
-        var trueType = createIntrinsicType(256, "true");
-        var falseType = createIntrinsicType(256, "false");
-        var booleanType = createBooleanType([trueType, falseType]);
-        var esSymbolType = createIntrinsicType(1024, "symbol");
-        var voidType = createIntrinsicType(4096, "void");
-        var neverType = createIntrinsicType(32768, "never");
-        var silentNeverType = createIntrinsicType(32768, "never");
-        var implicitNeverType = createIntrinsicType(32768, "never");
-        var nonPrimitiveType = createIntrinsicType(16777216, "object");
+        var unknownSymbol = createSymbol(4 /* Property */, "unknown");
+        var resolvingSymbol = createSymbol(0, "__resolving__" /* Resolving */);
+        var anyType = createIntrinsicType(1 /* Any */, "any");
+        var autoType = createIntrinsicType(1 /* Any */, "any");
+        var wildcardType = createIntrinsicType(1 /* Any */, "any");
+        var errorType = createIntrinsicType(1 /* Any */, "error");
+        var unknownType = createIntrinsicType(2 /* Unknown */, "unknown");
+        var undefinedType = createIntrinsicType(8192 /* Undefined */, "undefined");
+        var undefinedWideningType = strictNullChecks ? undefinedType : createIntrinsicType(8192 /* Undefined */ | 134217728 /* ContainsWideningType */, "undefined");
+        var nullType = createIntrinsicType(16384 /* Null */, "null");
+        var nullWideningType = strictNullChecks ? nullType : createIntrinsicType(16384 /* Null */ | 134217728 /* ContainsWideningType */, "null");
+        var stringType = createIntrinsicType(4 /* String */, "string");
+        var numberType = createIntrinsicType(8 /* Number */, "number");
+        var falseType = createIntrinsicType(256 /* BooleanLiteral */, "false");
+        var trueType = createIntrinsicType(256 /* BooleanLiteral */, "true");
+        var booleanType = createBooleanType([falseType, trueType]);
+        var esSymbolType = createIntrinsicType(1024 /* ESSymbol */, "symbol");
+        var voidType = createIntrinsicType(4096 /* Void */, "void");
+        var neverType = createIntrinsicType(32768 /* Never */, "never");
+        var silentNeverType = createIntrinsicType(32768 /* Never */, "never");
+        var implicitNeverType = createIntrinsicType(32768 /* Never */, "never");
+        var nonPrimitiveType = createIntrinsicType(16777216 /* NonPrimitive */, "object");
         var stringNumberSymbolType = getUnionType([stringType, numberType, esSymbolType]);
         var keyofConstraintType = keyofStringsOnly ? stringType : stringNumberSymbolType;
         var emptyObjectType = createAnonymousType(undefined, emptySymbols, ts.emptyArray, ts.emptyArray, undefined, undefined);
-        var emptyTypeLiteralSymbol = createSymbol(2048, "__type");
+        var emptyTypeLiteralSymbol = createSymbol(2048 /* TypeLiteral */, "__type" /* Type */);
         emptyTypeLiteralSymbol.members = ts.createSymbolTable();
         var emptyTypeLiteralType = createAnonymousType(emptyTypeLiteralSymbol, emptySymbols, ts.emptyArray, ts.emptyArray, undefined, undefined);
         var emptyGenericType = createAnonymousType(undefined, emptySymbols, ts.emptyArray, ts.emptyArray, undefined, undefined);
         emptyGenericType.instantiations = ts.createMap();
         var anyFunctionType = createAnonymousType(undefined, emptySymbols, ts.emptyArray, ts.emptyArray, undefined, undefined);
-        anyFunctionType.flags |= 536870912;
+        // The anyFunctionType contains the anyFunctionType by definition. The flag is further propagated
+        // in getPropagatingFlagsOfTypes, and it is checked in inferFromTypes.
+        anyFunctionType.flags |= 536870912 /* ContainsAnyFunctionType */;
         var noConstraintType = createAnonymousType(undefined, emptySymbols, ts.emptyArray, ts.emptyArray, undefined, undefined);
         var circularConstraintType = createAnonymousType(undefined, emptySymbols, ts.emptyArray, ts.emptyArray, undefined, undefined);
         var resolvingDefaultType = createAnonymousType(undefined, emptySymbols, ts.emptyArray, ts.emptyArray, undefined, undefined);
-        var markerSuperType = createType(65536);
-        var markerSubType = createType(65536);
+        var markerSuperType = createType(65536 /* TypeParameter */);
+        var markerSubType = createType(65536 /* TypeParameter */);
         markerSubType.constraint = markerSuperType;
-        var markerOtherType = createType(65536);
+        var markerOtherType = createType(65536 /* TypeParameter */);
         var noTypePredicate = createIdentifierTypePredicate("<<unresolved>>", 0, anyType);
-        var anySignature = createSignature(undefined, undefined, undefined, ts.emptyArray, anyType, undefined, 0, false, false);
-        var unknownSignature = createSignature(undefined, undefined, undefined, ts.emptyArray, errorType, undefined, 0, false, false);
-        var resolvingSignature = createSignature(undefined, undefined, undefined, ts.emptyArray, anyType, undefined, 0, false, false);
-        var silentNeverSignature = createSignature(undefined, undefined, undefined, ts.emptyArray, silentNeverType, undefined, 0, false, false);
+        var anySignature = createSignature(undefined, undefined, undefined, ts.emptyArray, anyType, /*resolvedTypePredicate*/ undefined, 0, /*hasRestParameter*/ false, /*hasLiteralTypes*/ false);
+        var unknownSignature = createSignature(undefined, undefined, undefined, ts.emptyArray, errorType, /*resolvedTypePredicate*/ undefined, 0, /*hasRestParameter*/ false, /*hasLiteralTypes*/ false);
+        var resolvingSignature = createSignature(undefined, undefined, undefined, ts.emptyArray, anyType, /*resolvedTypePredicate*/ undefined, 0, /*hasRestParameter*/ false, /*hasLiteralTypes*/ false);
+        var silentNeverSignature = createSignature(undefined, undefined, undefined, ts.emptyArray, silentNeverType, /*resolvedTypePredicate*/ undefined, 0, /*hasRestParameter*/ false, /*hasLiteralTypes*/ false);
         var resolvingSignaturesArray = [resolvingSignature];
-        var enumNumberIndexInfo = createIndexInfo(stringType, true);
-        var jsObjectLiteralIndexInfo = createIndexInfo(anyType, false);
+        var enumNumberIndexInfo = createIndexInfo(stringType, /*isReadonly*/ true);
+        var jsObjectLiteralIndexInfo = createIndexInfo(anyType, /*isReadonly*/ false);
         var globals = ts.createSymbolTable();
         var reverseMappedCache = ts.createMap();
         var ambientModulesCache;
+        /**
+         * List of every ambient module with a "*" wildcard.
+         * Unlike other ambient modules, these can't be stored in `globals` because symbol tables only deal with exact matches.
+         * This is only used if there is no exact match.
+         */
         var patternAmbientModules;
         var globalObjectType;
         var globalFunctionType;
@@ -23158,6 +29362,9 @@ var ts;
         var autoArrayType;
         var anyReadonlyArrayType;
         var deferredGlobalNonNullableTypeAlias;
+        // The library files are only loaded when the feature is used.
+        // This allows users to just specify library files they want to used through --lib
+        // and they will not get an error from not having unrelated library files
         var deferredGlobalESSymbolConstructorSymbol;
         var deferredGlobalESSymbolType;
         var deferredGlobalTypedPropertyDescriptorType;
@@ -23174,7 +29381,7 @@ var ts;
         var deferredGlobalImportMetaType;
         var deferredGlobalExtractSymbol;
         var deferredNodes;
-        var allPotentiallyUnusedIdentifiers = ts.createMap();
+        var allPotentiallyUnusedIdentifiers = ts.createMap(); // key is file name
         var flowLoopStart = 0;
         var flowLoopCount = 0;
         var sharedFlowCount = 0;
@@ -23199,6 +29406,7 @@ var ts;
         var potentialNewTargetCollisions = [];
         var awaitedTypeStack = [];
         var diagnostics = ts.createDiagnosticCollection();
+        // Suggestion diagnostics must have a file. Keyed by source file name.
         var suggestionDiagnostics = ts.createMultiMap();
         var TypeFacts;
         (function (TypeFacts) {
@@ -23226,6 +29434,9 @@ var ts;
             TypeFacts[TypeFacts["Truthy"] = 1048576] = "Truthy";
             TypeFacts[TypeFacts["Falsy"] = 2097152] = "Falsy";
             TypeFacts[TypeFacts["All"] = 4194303] = "All";
+            // The following members encode facts about particular kinds of types for use in the getTypeFacts function.
+            // The presence of a particular fact means that the given test is true for some (and possibly all) values
+            // of that kind of type.
             TypeFacts[TypeFacts["BaseStringStrictFacts"] = 933633] = "BaseStringStrictFacts";
             TypeFacts[TypeFacts["BaseStringFacts"] = 3145473] = "BaseStringFacts";
             TypeFacts[TypeFacts["StringStrictFacts"] = 4079361] = "StringStrictFacts";
@@ -23260,22 +29471,22 @@ var ts;
             TypeFacts[TypeFacts["NullFacts"] = 2340752] = "NullFacts";
         })(TypeFacts || (TypeFacts = {}));
         var typeofEQFacts = ts.createMapFromTemplate({
-            string: 1,
-            number: 2,
-            boolean: 4,
-            symbol: 8,
-            undefined: 16384,
-            object: 16,
-            function: 32
+            string: 1 /* TypeofEQString */,
+            number: 2 /* TypeofEQNumber */,
+            boolean: 4 /* TypeofEQBoolean */,
+            symbol: 8 /* TypeofEQSymbol */,
+            undefined: 16384 /* EQUndefined */,
+            object: 16 /* TypeofEQObject */,
+            function: 32 /* TypeofEQFunction */
         });
         var typeofNEFacts = ts.createMapFromTemplate({
-            string: 128,
-            number: 256,
-            boolean: 512,
-            symbol: 1024,
-            undefined: 131072,
-            object: 2048,
-            function: 4096
+            string: 128 /* TypeofNEString */,
+            number: 256 /* TypeofNENumber */,
+            boolean: 512 /* TypeofNEBoolean */,
+            symbol: 1024 /* TypeofNESymbol */,
+            undefined: 131072 /* NEUndefined */,
+            object: 2048 /* TypeofNEObject */,
+            function: 4096 /* TypeofNEFunction */
         });
         var typeofTypesByName = ts.createMapFromTemplate({
             string: stringType,
@@ -23343,52 +29554,55 @@ var ts;
         var isNotOverloadAndNotAccessor = ts.and(isNotOverload, isNotAccessor);
         initializeTypeChecker();
         return checker;
+        /**
+         * @deprecated
+         */
         function getSymbolDisplayBuilder() {
             return {
                 buildTypeDisplay: function (type, writer, enclosingDeclaration, flags) {
                     typeToString(type, enclosingDeclaration, flags, emitTextWriterWrapper(writer));
                 },
                 buildSymbolDisplay: function (symbol, writer, enclosingDeclaration, meaning, flags) {
-                    if (flags === void 0) { flags = 0; }
-                    symbolToString(symbol, enclosingDeclaration, meaning, flags | 4, emitTextWriterWrapper(writer));
+                    if (flags === void 0) { flags = 0 /* None */; }
+                    symbolToString(symbol, enclosingDeclaration, meaning, flags | 4 /* AllowAnyNodeKind */, emitTextWriterWrapper(writer));
                 },
                 buildSignatureDisplay: function (signature, writer, enclosing, flags, kind) {
                     signatureToString(signature, enclosing, flags, kind, emitTextWriterWrapper(writer));
                 },
                 buildIndexSignatureDisplay: function (info, writer, kind, enclosing, flags) {
-                    var sig = nodeBuilder.indexInfoToIndexSignatureDeclaration(info, kind, enclosing, toNodeBuilderFlags(flags) | 3112960, writer);
+                    var sig = nodeBuilder.indexInfoToIndexSignatureDeclaration(info, kind, enclosing, toNodeBuilderFlags(flags) | 3112960 /* IgnoreErrors */, writer);
                     var printer = ts.createPrinter({ removeComments: true });
-                    printer.writeNode(4, sig, ts.getSourceFileOfNode(ts.getParseTreeNode(enclosing)), emitTextWriterWrapper(writer));
+                    printer.writeNode(4 /* Unspecified */, sig, ts.getSourceFileOfNode(ts.getParseTreeNode(enclosing)), emitTextWriterWrapper(writer));
                 },
                 buildParameterDisplay: function (symbol, writer, enclosing, flags) {
-                    var node = nodeBuilder.symbolToParameterDeclaration(symbol, enclosing, toNodeBuilderFlags(flags) | 3112960, writer);
+                    var node = nodeBuilder.symbolToParameterDeclaration(symbol, enclosing, toNodeBuilderFlags(flags) | 3112960 /* IgnoreErrors */, writer);
                     var printer = ts.createPrinter({ removeComments: true });
-                    printer.writeNode(4, node, ts.getSourceFileOfNode(ts.getParseTreeNode(enclosing)), emitTextWriterWrapper(writer));
+                    printer.writeNode(4 /* Unspecified */, node, ts.getSourceFileOfNode(ts.getParseTreeNode(enclosing)), emitTextWriterWrapper(writer)); // TODO: GH#18217
                 },
                 buildTypeParameterDisplay: function (tp, writer, enclosing, flags) {
-                    var node = nodeBuilder.typeParameterToDeclaration(tp, enclosing, toNodeBuilderFlags(flags) | 3112960 | 8192, writer);
+                    var node = nodeBuilder.typeParameterToDeclaration(tp, enclosing, toNodeBuilderFlags(flags) | 3112960 /* IgnoreErrors */ | 8192 /* OmitParameterModifiers */, writer);
                     var printer = ts.createPrinter({ removeComments: true });
-                    printer.writeNode(4, node, ts.getSourceFileOfNode(ts.getParseTreeNode(enclosing)), emitTextWriterWrapper(writer));
+                    printer.writeNode(4 /* Unspecified */, node, ts.getSourceFileOfNode(ts.getParseTreeNode(enclosing)), emitTextWriterWrapper(writer)); // TODO: GH#18217
                 },
                 buildTypePredicateDisplay: function (predicate, writer, enclosing, flags) {
                     typePredicateToString(predicate, enclosing, flags, emitTextWriterWrapper(writer));
                 },
                 buildTypeParameterDisplayFromSymbol: function (symbol, writer, enclosing, flags) {
-                    var nodes = nodeBuilder.symbolToTypeParameterDeclarations(symbol, enclosing, toNodeBuilderFlags(flags) | 3112960, writer);
+                    var nodes = nodeBuilder.symbolToTypeParameterDeclarations(symbol, enclosing, toNodeBuilderFlags(flags) | 3112960 /* IgnoreErrors */, writer);
                     var printer = ts.createPrinter({ removeComments: true });
-                    printer.writeList(26896, nodes, ts.getSourceFileOfNode(ts.getParseTreeNode(enclosing)), emitTextWriterWrapper(writer));
+                    printer.writeList(26896 /* TypeParameters */, nodes, ts.getSourceFileOfNode(ts.getParseTreeNode(enclosing)), emitTextWriterWrapper(writer));
                 },
                 buildDisplayForParametersAndDelimiters: function (thisParameter, parameters, writer, enclosing, originalFlags) {
                     var printer = ts.createPrinter({ removeComments: true });
-                    var flags = 8192 | 3112960 | toNodeBuilderFlags(originalFlags);
-                    var thisParameterArray = thisParameter ? [nodeBuilder.symbolToParameterDeclaration(thisParameter, enclosing, flags)] : [];
-                    var params = ts.createNodeArray(thisParameterArray.concat(ts.map(parameters, function (param) { return nodeBuilder.symbolToParameterDeclaration(param, enclosing, flags); })));
-                    printer.writeList(1296, params, ts.getSourceFileOfNode(ts.getParseTreeNode(enclosing)), emitTextWriterWrapper(writer));
+                    var flags = 8192 /* OmitParameterModifiers */ | 3112960 /* IgnoreErrors */ | toNodeBuilderFlags(originalFlags);
+                    var thisParameterArray = thisParameter ? [nodeBuilder.symbolToParameterDeclaration(thisParameter, enclosing, flags)] : []; // TODO: GH#18217
+                    var params = ts.createNodeArray(thisParameterArray.concat(ts.map(parameters, function (param) { return nodeBuilder.symbolToParameterDeclaration(param, enclosing, flags); }))); // TODO: GH#18217
+                    printer.writeList(1296 /* CallExpressionArguments */, params, ts.getSourceFileOfNode(ts.getParseTreeNode(enclosing)), emitTextWriterWrapper(writer));
                 },
                 buildDisplayForTypeParametersAndDelimiters: function (typeParameters, writer, enclosing, flags) {
                     var printer = ts.createPrinter({ removeComments: true });
-                    var args = ts.createNodeArray(ts.map(typeParameters, function (p) { return nodeBuilder.typeParameterToDeclaration(p, enclosing, toNodeBuilderFlags(flags)); }));
-                    printer.writeList(26896, args, ts.getSourceFileOfNode(ts.getParseTreeNode(enclosing)), emitTextWriterWrapper(writer));
+                    var args = ts.createNodeArray(ts.map(typeParameters, function (p) { return nodeBuilder.typeParameterToDeclaration(p, enclosing, toNodeBuilderFlags(flags)); })); // TODO: GH#18217
+                    printer.writeList(26896 /* TypeParameters */, args, ts.getSourceFileOfNode(ts.getParseTreeNode(enclosing)), emitTextWriterWrapper(writer));
                 },
                 buildReturnTypeDisplay: function (signature, writer, enclosing, flags) {
                     writer.writePunctuation(":");
@@ -23397,9 +29611,9 @@ var ts;
                     if (predicate) {
                         return typePredicateToString(predicate, enclosing, flags, emitTextWriterWrapper(writer));
                     }
-                    var node = nodeBuilder.typeToTypeNode(getReturnTypeOfSignature(signature), enclosing, toNodeBuilderFlags(flags) | 3112960, writer);
+                    var node = nodeBuilder.typeToTypeNode(getReturnTypeOfSignature(signature), enclosing, toNodeBuilderFlags(flags) | 3112960 /* IgnoreErrors */, writer);
                     var printer = ts.createPrinter({ removeComments: true });
-                    printer.writeNode(4, node, ts.getSourceFileOfNode(ts.getParseTreeNode(enclosing)), emitTextWriterWrapper(writer));
+                    printer.writeNode(4 /* Unspecified */, node, ts.getSourceFileOfNode(ts.getParseTreeNode(enclosing)), emitTextWriterWrapper(writer)); // TODO: GH#18217
                 }
             };
             function emitTextWriterWrapper(underlying) {
@@ -23486,7 +29700,7 @@ var ts;
                     }
                     var jsxPragma = file.pragmas.get("jsx");
                     if (jsxPragma) {
-                        var chosenpragma = ts.isArray(jsxPragma) ? jsxPragma[0] : jsxPragma;
+                        var chosenpragma = ts.isArray(jsxPragma) ? jsxPragma[0] : jsxPragma; // TODO: GH#18217
                         file.localJsxFactory = ts.parseIsolatedEntityName(chosenpragma.arguments.factory, languageVersion);
                         if (file.localJsxFactory) {
                             return file.localJsxNamespace = getFirstIdentifier(file.localJsxFactory).escapedText;
@@ -23509,6 +29723,8 @@ var ts;
             return _jsxNamespace;
         }
         function getEmitResolver(sourceFile, cancellationToken) {
+            // Ensure we have all the type information in place for this file so that all the
+            // emitter questions of this resolver will return the right information.
             getDiagnostics(sourceFile, cancellationToken);
             return emitResolver;
         }
@@ -23531,47 +29747,47 @@ var ts;
         }
         function createSymbol(flags, name, checkFlags) {
             symbolCount++;
-            var symbol = (new Symbol(flags | 33554432, name));
+            var symbol = (new Symbol(flags | 33554432 /* Transient */, name));
             symbol.checkFlags = checkFlags || 0;
             return symbol;
         }
         function isTransientSymbol(symbol) {
-            return (symbol.flags & 33554432) !== 0;
+            return (symbol.flags & 33554432 /* Transient */) !== 0;
         }
         function getExcludedSymbolFlags(flags) {
             var result = 0;
-            if (flags & 2)
-                result |= 67216319;
-            if (flags & 1)
-                result |= 67216318;
-            if (flags & 4)
-                result |= 0;
-            if (flags & 8)
-                result |= 68008959;
-            if (flags & 16)
-                result |= 67215791;
-            if (flags & 32)
-                result |= 68008383;
-            if (flags & 64)
-                result |= 67901832;
-            if (flags & 256)
-                result |= 68008191;
-            if (flags & 128)
-                result |= 68008831;
-            if (flags & 512)
-                result |= 67215503;
-            if (flags & 8192)
-                result |= 67208127;
-            if (flags & 32768)
-                result |= 67150783;
-            if (flags & 65536)
-                result |= 67183551;
-            if (flags & 262144)
-                result |= 67639784;
-            if (flags & 524288)
-                result |= 67901928;
-            if (flags & 2097152)
-                result |= 2097152;
+            if (flags & 2 /* BlockScopedVariable */)
+                result |= 67216319 /* BlockScopedVariableExcludes */;
+            if (flags & 1 /* FunctionScopedVariable */)
+                result |= 67216318 /* FunctionScopedVariableExcludes */;
+            if (flags & 4 /* Property */)
+                result |= 0 /* PropertyExcludes */;
+            if (flags & 8 /* EnumMember */)
+                result |= 68008959 /* EnumMemberExcludes */;
+            if (flags & 16 /* Function */)
+                result |= 67215791 /* FunctionExcludes */;
+            if (flags & 32 /* Class */)
+                result |= 68008383 /* ClassExcludes */;
+            if (flags & 64 /* Interface */)
+                result |= 67901832 /* InterfaceExcludes */;
+            if (flags & 256 /* RegularEnum */)
+                result |= 68008191 /* RegularEnumExcludes */;
+            if (flags & 128 /* ConstEnum */)
+                result |= 68008831 /* ConstEnumExcludes */;
+            if (flags & 512 /* ValueModule */)
+                result |= 67215503 /* ValueModuleExcludes */;
+            if (flags & 8192 /* Method */)
+                result |= 67208127 /* MethodExcludes */;
+            if (flags & 32768 /* GetAccessor */)
+                result |= 67150783 /* GetAccessorExcludes */;
+            if (flags & 65536 /* SetAccessor */)
+                result |= 67183551 /* SetAccessorExcludes */;
+            if (flags & 262144 /* TypeParameter */)
+                result |= 67639784 /* TypeParameterExcludes */;
+            if (flags & 524288 /* TypeAlias */)
+                result |= 67901928 /* TypeAliasExcludes */;
+            if (flags & 2097152 /* Alias */)
+                result |= 2097152 /* AliasExcludes */;
             return result;
         }
         function recordMergedSymbol(target, source) {
@@ -23596,20 +29812,27 @@ var ts;
             recordMergedSymbol(result, symbol);
             return result;
         }
+        /**
+         * Note: if target is transient, then it is mutable, and mergeSymbol with both mutate and return it.
+         * If target is not transient, mergeSymbol will produce a transient clone, mutate that and return it.
+         */
         function mergeSymbol(target, source) {
             if (!(target.flags & getExcludedSymbolFlags(source.flags)) ||
-                (source.flags | target.flags) & 67108864) {
+                (source.flags | target.flags) & 67108864 /* JSContainer */) {
                 ts.Debug.assert(source !== target);
-                if (!(target.flags & 33554432)) {
+                if (!(target.flags & 33554432 /* Transient */)) {
                     target = cloneSymbol(target);
                 }
-                if (source.flags & 512 && target.flags & 512 && target.constEnumOnlyModule && !source.constEnumOnlyModule) {
+                // Javascript static-property-assignment declarations always merge, even though they are also values
+                if (source.flags & 512 /* ValueModule */ && target.flags & 512 /* ValueModule */ && target.constEnumOnlyModule && !source.constEnumOnlyModule) {
+                    // reset flag when merging instantiated module into value module that has only const enums
                     target.constEnumOnlyModule = false;
                 }
                 target.flags |= source.flags;
                 if (source.valueDeclaration &&
                     (!target.valueDeclaration ||
-                        (target.valueDeclaration.kind === 239 && source.valueDeclaration.kind !== 239))) {
+                        ts.isEffectiveModuleDeclaration(target.valueDeclaration) && !ts.isEffectiveModuleDeclaration(source.valueDeclaration))) {
+                    // other kinds of value declarations take precedence over modules
                     target.valueDeclaration = source.valueDeclaration;
                 }
                 ts.addRange(target.declarations, source.declarations);
@@ -23625,21 +29848,21 @@ var ts;
                 }
                 recordMergedSymbol(target, source);
             }
-            else if (target.flags & 1024) {
+            else if (target.flags & 1024 /* NamespaceModule */) {
                 error(ts.getNameOfDeclaration(source.declarations[0]), ts.Diagnostics.Cannot_augment_module_0_with_value_exports_because_it_resolves_to_a_non_module_entity, symbolToString(target));
             }
             else {
-                var message_2 = target.flags & 384 || source.flags & 384
+                var message_2 = target.flags & 384 /* Enum */ || source.flags & 384 /* Enum */
                     ? ts.Diagnostics.Enum_declarations_can_only_merge_with_namespace_or_other_enum_declarations
-                    : target.flags & 2 || source.flags & 2
+                    : target.flags & 2 /* BlockScopedVariable */ || source.flags & 2 /* BlockScopedVariable */
                         ? ts.Diagnostics.Cannot_redeclare_block_scoped_variable_0
                         : ts.Diagnostics.Duplicate_identifier_0;
                 ts.forEach(source.declarations, function (node) {
-                    var errorNode = (ts.getJavascriptInitializer(node, false) ? ts.getOuterNameOfJsInitializer(node) : ts.getNameOfDeclaration(node)) || node;
+                    var errorNode = (ts.getJavascriptInitializer(node, /*isPrototypeAssignment*/ false) ? ts.getOuterNameOfJsInitializer(node) : ts.getNameOfDeclaration(node)) || node;
                     error(errorNode, message_2, symbolToString(source));
                 });
                 ts.forEach(target.declarations, function (node) {
-                    var errorNode = (ts.getJavascriptInitializer(node, false) ? ts.getOuterNameOfJsInitializer(node) : ts.getNameOfDeclaration(node)) || node;
+                    var errorNode = (ts.getJavascriptInitializer(node, /*isPrototypeAssignment*/ false) ? ts.getOuterNameOfJsInitializer(node) : ts.getNameOfDeclaration(node)) || node;
                     error(errorNode, message_2, symbolToString(source));
                 });
             }
@@ -23663,6 +29886,9 @@ var ts;
         function mergeModuleAugmentation(moduleName) {
             var moduleAugmentation = moduleName.parent;
             if (moduleAugmentation.symbol.declarations[0] !== moduleAugmentation) {
+                // this is a combined symbol for multiple augmentations within the same file.
+                // its symbol already has accumulated information for all declarations
+                // so we need to add it just once - do the work only for first declaration
                 ts.Debug.assert(moduleAugmentation.symbol.declarations.length > 1);
                 return;
             }
@@ -23670,18 +29896,22 @@ var ts;
                 mergeSymbolTable(globals, moduleAugmentation.symbol.exports);
             }
             else {
-                var moduleNotFoundError = !(moduleName.parent.parent.flags & 4194304)
+                // find a module that about to be augmented
+                // do not validate names of augmentations that are defined in ambient context
+                var moduleNotFoundError = !(moduleName.parent.parent.flags & 4194304 /* Ambient */)
                     ? ts.Diagnostics.Invalid_module_name_in_augmentation_module_0_cannot_be_found
                     : undefined;
-                var mainModule = resolveExternalModuleNameWorker(moduleName, moduleName, moduleNotFoundError, true);
+                var mainModule = resolveExternalModuleNameWorker(moduleName, moduleName, moduleNotFoundError, /*isForAugmentation*/ true);
                 if (!mainModule) {
                     return;
                 }
+                // obtain item referenced by 'export='
                 mainModule = resolveExternalModuleSymbol(mainModule);
-                if (mainModule.flags & 1920) {
+                if (mainModule.flags & 1920 /* Namespace */) {
                     mainModule = mergeSymbol(mainModule, moduleAugmentation.symbol);
                 }
                 else {
+                    // moduleName will be a StringLiteral since this is not `declare global`.
                     error(moduleName, ts.Diagnostics.Cannot_augment_module_0_because_it_resolves_to_a_non_module_entity, moduleName.text);
                 }
             }
@@ -23690,6 +29920,7 @@ var ts;
             source.forEach(function (sourceSymbol, id) {
                 var targetSymbol = target.get(id);
                 if (targetSymbol) {
+                    // Error on redeclarations
                     ts.forEach(targetSymbol.declarations, addDeclarationDiagnostic(ts.unescapeLeadingUnderscores(id), message));
                 }
                 else {
@@ -23701,7 +29932,7 @@ var ts;
             }
         }
         function getSymbolLinks(symbol) {
-            if (symbol.flags & 33554432)
+            if (symbol.flags & 33554432 /* Transient */)
                 return symbol;
             var id = getSymbolId(symbol);
             return symbolLinks[id] || (symbolLinks[id] = {});
@@ -23711,30 +29942,38 @@ var ts;
             return nodeLinks[nodeId] || (nodeLinks[nodeId] = { flags: 0 });
         }
         function isGlobalSourceFile(node) {
-            return node.kind === 274 && !ts.isExternalOrCommonJsModule(node);
+            return node.kind === 274 /* SourceFile */ && !ts.isExternalOrCommonJsModule(node);
         }
         function getSymbol(symbols, name, meaning) {
             if (meaning) {
                 var symbol = symbols.get(name);
                 if (symbol) {
-                    ts.Debug.assert((ts.getCheckFlags(symbol) & 1) === 0, "Should never get an instantiated symbol here.");
+                    ts.Debug.assert((ts.getCheckFlags(symbol) & 1 /* Instantiated */) === 0, "Should never get an instantiated symbol here.");
                     if (symbol.flags & meaning) {
                         return symbol;
                     }
-                    if (symbol.flags & 2097152) {
+                    if (symbol.flags & 2097152 /* Alias */) {
                         var target = resolveAlias(symbol);
+                        // Unknown symbol means an error occurred in alias resolution, treat it as positive answer to avoid cascading errors
                         if (target === unknownSymbol || target.flags & meaning) {
                             return symbol;
                         }
                     }
                 }
             }
+            // return undefined if we can't find a symbol.
         }
+        /**
+         * Get symbols that represent parameter-property-declaration as parameter and as property declaration
+         * @param parameter a parameterDeclaration node
+         * @param parameterName a name of the parameter to get the symbols for.
+         * @return a tuple of two symbols
+         */
         function getSymbolsOfParameterPropertyDeclaration(parameter, parameterName) {
             var constructorDeclaration = parameter.parent;
             var classDeclaration = parameter.parent.parent;
-            var parameterSymbol = getSymbol(constructorDeclaration.locals, parameterName, 67216319);
-            var propertySymbol = getSymbol(getMembersOfSymbol(classDeclaration.symbol), parameterName, 67216319);
+            var parameterSymbol = getSymbol(constructorDeclaration.locals, parameterName, 67216319 /* Value */);
+            var propertySymbol = getSymbol(getMembersOfSymbol(classDeclaration.symbol), parameterName, 67216319 /* Value */);
             if (parameterSymbol && propertySymbol) {
                 return [parameterSymbol, propertySymbol];
             }
@@ -23747,9 +29986,12 @@ var ts;
                 if ((moduleKind && (declarationFile.externalModuleIndicator || useFile.externalModuleIndicator)) ||
                     (!compilerOptions.outFile && !compilerOptions.out) ||
                     isInTypeQuery(usage) ||
-                    declaration.flags & 4194304) {
+                    declaration.flags & 4194304 /* Ambient */) {
+                    // nodes are in different files and order cannot be determined
                     return true;
                 }
+                // declaration is after usage
+                // can be legal if usage is deferred (i.e. inside function or in initializer of instance property)
                 if (isUsedInFunctionOrInstanceProperty(usage, declaration)) {
                     return true;
                 }
@@ -23757,26 +29999,41 @@ var ts;
                 return sourceFiles.indexOf(declarationFile) <= sourceFiles.indexOf(useFile);
             }
             if (declaration.pos <= usage.pos) {
-                if (declaration.kind === 182) {
-                    var errorBindingElement = ts.getAncestor(usage, 182);
+                // declaration is before usage
+                if (declaration.kind === 182 /* BindingElement */) {
+                    // still might be illegal if declaration and usage are both binding elements (eg var [a = b, b = b] = [1, 2])
+                    var errorBindingElement = ts.getAncestor(usage, 182 /* BindingElement */);
                     if (errorBindingElement) {
                         return ts.findAncestor(errorBindingElement, ts.isBindingElement) !== ts.findAncestor(declaration, ts.isBindingElement) ||
                             declaration.pos < errorBindingElement.pos;
                     }
-                    return isBlockScopedNameDeclaredBeforeUse(ts.getAncestor(declaration, 232), usage);
+                    // or it might be illegal if usage happens before parent variable is declared (eg var [a] = a)
+                    return isBlockScopedNameDeclaredBeforeUse(ts.getAncestor(declaration, 232 /* VariableDeclaration */), usage);
                 }
-                else if (declaration.kind === 232) {
+                else if (declaration.kind === 232 /* VariableDeclaration */) {
+                    // still might be illegal if usage is in the initializer of the variable declaration (eg var a = a)
                     return !isImmediatelyUsedInInitializerOfBlockScopedVariable(declaration, usage);
                 }
                 else if (ts.isClassDeclaration(declaration)) {
+                    // still might be illegal if the usage is within a computed property name in the class (eg class A { static p = "a"; [A.p]() {} })
                     return !ts.findAncestor(usage, function (n) { return ts.isComputedPropertyName(n) && n.parent.parent === declaration; });
                 }
                 return true;
             }
-            if (usage.parent.kind === 252 || (usage.parent.kind === 249 && usage.parent.isExportEquals)) {
+            // declaration is after usage, but it can still be legal if usage is deferred:
+            // 1. inside an export specifier
+            // 2. inside a function
+            // 3. inside an instance property initializer, a reference to a non-instance property
+            // 4. inside a static property initializer, a reference to a static method in the same class
+            // 5. inside a TS export= declaration (since we will move the export statement during emit to avoid TDZ)
+            // or if usage is in a type context:
+            // 1. inside a type query (typeof in type position)
+            if (usage.parent.kind === 252 /* ExportSpecifier */ || (usage.parent.kind === 249 /* ExportAssignment */ && usage.parent.isExportEquals)) {
+                // export specifiers do not use the variable, they only make it available for use
                 return true;
             }
-            if (usage.kind === 249 && usage.isExportEquals) {
+            // When resolving symbols for exports, the `usage` location passed in can be the export site directly
+            if (usage.kind === 249 /* ExportAssignment */ && usage.isExportEquals) {
                 return true;
             }
             var container = ts.getEnclosingBlockScopeContainer(declaration);
@@ -23784,14 +30041,17 @@ var ts;
             function isImmediatelyUsedInInitializerOfBlockScopedVariable(declaration, usage) {
                 var container = ts.getEnclosingBlockScopeContainer(declaration);
                 switch (declaration.parent.parent.kind) {
-                    case 214:
-                    case 220:
-                    case 222:
+                    case 214 /* VariableStatement */:
+                    case 220 /* ForStatement */:
+                    case 222 /* ForOfStatement */:
+                        // variable statement/for/for-of statement case,
+                        // use site should not be inside variable declaration (initializer of declaration or binding element)
                         if (isSameScopeDescendentOf(usage, declaration, container)) {
                             return true;
                         }
                         break;
                 }
+                // ForIn/ForOf case - use site should not be used in expression part
                 var grandparent = declaration.parent.parent;
                 return ts.isForInOrOfStatement(grandparent) && isSameScopeDescendentOf(usage, grandparent.expression, container);
             }
@@ -23804,16 +30064,16 @@ var ts;
                         return true;
                     }
                     var initializerOfProperty = current.parent &&
-                        current.parent.kind === 152 &&
+                        current.parent.kind === 152 /* PropertyDeclaration */ &&
                         current.parent.initializer === current;
                     if (initializerOfProperty) {
-                        if (ts.hasModifier(current.parent, 32)) {
-                            if (declaration.kind === 154) {
+                        if (ts.hasModifier(current.parent, 32 /* Static */)) {
+                            if (declaration.kind === 154 /* MethodDeclaration */) {
                                 return true;
                             }
                         }
                         else {
-                            var isDeclarationInstanceProperty = declaration.kind === 152 && !ts.hasModifier(declaration, 32);
+                            var isDeclarationInstanceProperty = declaration.kind === 152 /* PropertyDeclaration */ && !ts.hasModifier(declaration, 32 /* Static */);
                             if (!isDeclarationInstanceProperty || ts.getContainingClass(usage) !== ts.getContainingClass(declaration)) {
                                 return true;
                             }
@@ -23823,12 +30083,19 @@ var ts;
                 });
             }
         }
+        /**
+         * Resolve a given name for a given meaning at a given location. An error is reported if the name was not found and
+         * the nameNotFoundMessage argument is not undefined. Returns the resolved symbol, or undefined if no symbol with
+         * the given name can be found.
+         *
+         * @param isUse If true, this will count towards --noUnusedLocals / --noUnusedParameters.
+         */
         function resolveName(location, name, meaning, nameNotFoundMessage, nameArg, isUse, excludeGlobals, suggestedNameNotFoundMessage) {
             if (excludeGlobals === void 0) { excludeGlobals = false; }
             return resolveNameHelper(location, name, meaning, nameNotFoundMessage, nameArg, isUse, excludeGlobals, getSymbol, suggestedNameNotFoundMessage);
         }
         function resolveNameHelper(location, name, meaning, nameNotFoundMessage, nameArg, isUse, excludeGlobals, lookup, suggestedNameNotFoundMessage) {
-            var originalLocation = location;
+            var originalLocation = location; // needed for did-you-mean error reporting, which gathers candidates starting from the original location
             var result;
             var lastLocation;
             var lastSelfReferenceLocation;
@@ -23837,25 +30104,40 @@ var ts;
             var grandparent;
             var isInExternalModule = false;
             loop: while (location) {
+                // Locals of a source file are not in scope (because they get merged into the global symbol table)
                 if (location.locals && !isGlobalSourceFile(location)) {
                     if (result = lookup(location.locals, name, meaning)) {
                         var useResult = true;
                         if (ts.isFunctionLike(location) && lastLocation && lastLocation !== location.body) {
-                            if (meaning & result.flags & 67901928 && lastLocation.kind !== 286) {
-                                useResult = result.flags & 262144
+                            // symbol lookup restrictions for function-like declarations
+                            // - Type parameters of a function are in scope in the entire function declaration, including the parameter
+                            //   list and return type. However, local types are only in scope in the function body.
+                            // - parameters are only in the scope of function body
+                            // This restriction does not apply to JSDoc comment types because they are parented
+                            // at a higher level than type parameters would normally be
+                            if (meaning & result.flags & 67901928 /* Type */ && lastLocation.kind !== 286 /* JSDocComment */) {
+                                useResult = result.flags & 262144 /* TypeParameter */
+                                    // type parameters are visible in parameter list, return type and type parameter list
                                     ? lastLocation === location.type ||
-                                        lastLocation.kind === 149 ||
-                                        lastLocation.kind === 148
+                                        lastLocation.kind === 149 /* Parameter */ ||
+                                        lastLocation.kind === 148 /* TypeParameter */
+                                    // local types not visible outside the function body
                                     : false;
                             }
-                            if (meaning & 67216319 && result.flags & 1) {
+                            if (meaning & 67216319 /* Value */ && result.flags & 1 /* FunctionScopedVariable */) {
+                                // parameters are visible only inside function body, parameter list and return type
+                                // technically for parameter list case here we might mix parameters and variables declared in function,
+                                // however it is detected separately when checking initializers of parameters
+                                // to make sure that they reference no variables declared after them.
                                 useResult =
-                                    lastLocation.kind === 149 ||
+                                    lastLocation.kind === 149 /* Parameter */ ||
                                         (lastLocation === location.type &&
                                             !!ts.findAncestor(result.valueDeclaration, ts.isParameter));
                             }
                         }
-                        else if (location.kind === 171) {
+                        else if (location.kind === 171 /* ConditionalType */) {
+                            // A type parameter declared using 'infer T' in a conditional type is visible only in
+                            // the true branch of the conditional type.
                             useResult = lastLocation === location.trueType;
                         }
                         if (useResult) {
@@ -23867,28 +30149,43 @@ var ts;
                     }
                 }
                 switch (location.kind) {
-                    case 274:
+                    case 274 /* SourceFile */:
                         if (!ts.isExternalOrCommonJsModule(location))
                             break;
                         isInExternalModule = true;
-                    case 239:
+                    // falls through
+                    case 239 /* ModuleDeclaration */:
                         var moduleExports = getSymbolOfNode(location).exports;
-                        if (location.kind === 274 || ts.isAmbientModule(location)) {
-                            if (result = moduleExports.get("default")) {
+                        if (location.kind === 274 /* SourceFile */ || ts.isAmbientModule(location)) {
+                            // It's an external module. First see if the module has an export default and if the local
+                            // name of that export default matches.
+                            if (result = moduleExports.get("default" /* Default */)) {
                                 var localSymbol = ts.getLocalSymbolForExportDefault(result);
                                 if (localSymbol && (result.flags & meaning) && localSymbol.escapedName === name) {
                                     break loop;
                                 }
                                 result = undefined;
                             }
+                            // Because of module/namespace merging, a module's exports are in scope,
+                            // yet we never want to treat an export specifier as putting a member in scope.
+                            // Therefore, if the name we find is purely an export specifier, it is not actually considered in scope.
+                            // Two things to note about this:
+                            //     1. We have to check this without calling getSymbol. The problem with calling getSymbol
+                            //        on an export specifier is that it might find the export specifier itself, and try to
+                            //        resolve it as an alias. This will cause the checker to consider the export specifier
+                            //        a circular alias reference when it might not be.
+                            //     2. We check === SymbolFlags.Alias in order to check that the symbol is *purely*
+                            //        an alias. If we used &, we'd be throwing out symbols that have non alias aspects,
+                            //        which is not the desired behavior.
                             var moduleExport = moduleExports.get(name);
                             if (moduleExport &&
-                                moduleExport.flags === 2097152 &&
-                                ts.getDeclarationOfKind(moduleExport, 252)) {
+                                moduleExport.flags === 2097152 /* Alias */ &&
+                                ts.getDeclarationOfKind(moduleExport, 252 /* ExportSpecifier */)) {
                                 break;
                             }
                         }
-                        if (name !== "default" && (result = lookup(moduleExports, name, meaning & 2623475))) {
+                        // ES6 exports are also visible locally (except for 'default'), but commonjs exports are not (except typedefs)
+                        if (name !== "default" /* Default */ && (result = lookup(moduleExports, name, meaning & 2623475 /* ModuleMember */))) {
                             if (ts.isSourceFile(location) && location.commonJsModuleIndicator && !result.declarations.some(ts.isJSDocTypeAlias)) {
                                 result = undefined;
                             }
@@ -23897,37 +30194,48 @@ var ts;
                             }
                         }
                         break;
-                    case 238:
-                        if (result = lookup(getSymbolOfNode(location).exports, name, meaning & 8)) {
+                    case 238 /* EnumDeclaration */:
+                        if (result = lookup(getSymbolOfNode(location).exports, name, meaning & 8 /* EnumMember */)) {
                             break loop;
                         }
                         break;
-                    case 152:
-                    case 151:
-                        if (ts.isClassLike(location.parent) && !ts.hasModifier(location, 32)) {
+                    case 152 /* PropertyDeclaration */:
+                    case 151 /* PropertySignature */:
+                        // TypeScript 1.0 spec (April 2014): 8.4.1
+                        // Initializer expressions for instance member variables are evaluated in the scope
+                        // of the class constructor body but are not permitted to reference parameters or
+                        // local variables of the constructor. This effectively means that entities from outer scopes
+                        // by the same name as a constructor parameter or local variable are inaccessible
+                        // in initializer expressions for instance member variables.
+                        if (ts.isClassLike(location.parent) && !ts.hasModifier(location, 32 /* Static */)) {
                             var ctor = findConstructorDeclaration(location.parent);
                             if (ctor && ctor.locals) {
-                                if (lookup(ctor.locals, name, meaning & 67216319)) {
+                                if (lookup(ctor.locals, name, meaning & 67216319 /* Value */)) {
+                                    // Remember the property node, it will be used later to report appropriate error
                                     propertyWithInvalidInitializer = location;
                                 }
                             }
                         }
                         break;
-                    case 235:
-                    case 205:
-                    case 236:
-                        if (result = lookup(getMembersOfSymbol(getSymbolOfNode(location)), name, meaning & 67901928)) {
+                    case 235 /* ClassDeclaration */:
+                    case 205 /* ClassExpression */:
+                    case 236 /* InterfaceDeclaration */:
+                        if (result = lookup(getMembersOfSymbol(getSymbolOfNode(location)), name, meaning & 67901928 /* Type */)) {
                             if (!isTypeParameterSymbolDeclaredInContainer(result, location)) {
+                                // ignore type parameters not declared in this container
                                 result = undefined;
                                 break;
                             }
-                            if (lastLocation && ts.hasModifier(lastLocation, 32)) {
+                            if (lastLocation && ts.hasModifier(lastLocation, 32 /* Static */)) {
+                                // TypeScript 1.0 spec (April 2014): 3.4.1
+                                // The scope of a type parameter extends over the entire declaration with which the type
+                                // parameter list is associated, with the exception of static member declarations in classes.
                                 error(errorLocation, ts.Diagnostics.Static_members_cannot_reference_class_type_parameters);
                                 return undefined;
                             }
                             break loop;
                         }
-                        if (location.kind === 205 && meaning & 32) {
+                        if (location.kind === 205 /* ClassExpression */ && meaning & 32 /* Class */) {
                             var className = location.name;
                             if (className && name === className.escapedText) {
                                 result = location.symbol;
@@ -23935,10 +30243,11 @@ var ts;
                             }
                         }
                         break;
-                    case 207:
-                        if (lastLocation === location.expression && location.parent.token === 85) {
+                    case 207 /* ExpressionWithTypeArguments */:
+                        // The type parameters of a class are not in scope in the base class expression.
+                        if (lastLocation === location.expression && location.parent.token === 85 /* ExtendsKeyword */) {
                             var container = location.parent.parent;
-                            if (ts.isClassLike(container) && (result = lookup(getSymbolOfNode(container).members, name, meaning & 67901928))) {
+                            if (ts.isClassLike(container) && (result = lookup(getSymbolOfNode(container).members, name, meaning & 67901928 /* Type */))) {
                                 if (nameNotFoundMessage) {
                                     error(errorLocation, ts.Diagnostics.Base_class_expressions_cannot_reference_class_type_parameters);
                                 }
@@ -23946,33 +30255,42 @@ var ts;
                             }
                         }
                         break;
-                    case 147:
+                    // It is not legal to reference a class's own type parameters from a computed property name that
+                    // belongs to the class. For example:
+                    //
+                    //   function foo<T>() { return '' }
+                    //   class C<T> { // <-- Class's own type parameter T
+                    //       [foo<T>()]() { } // <-- Reference to T from class's own computed property
+                    //   }
+                    //
+                    case 147 /* ComputedPropertyName */:
                         grandparent = location.parent.parent;
-                        if (ts.isClassLike(grandparent) || grandparent.kind === 236) {
-                            if (result = lookup(getSymbolOfNode(grandparent).members, name, meaning & 67901928)) {
+                        if (ts.isClassLike(grandparent) || grandparent.kind === 236 /* InterfaceDeclaration */) {
+                            // A reference to this grandparent's type parameters would be an error
+                            if (result = lookup(getSymbolOfNode(grandparent).members, name, meaning & 67901928 /* Type */)) {
                                 error(errorLocation, ts.Diagnostics.A_computed_property_name_cannot_reference_a_type_parameter_from_its_containing_type);
                                 return undefined;
                             }
                         }
                         break;
-                    case 154:
-                    case 153:
-                    case 155:
-                    case 156:
-                    case 157:
-                    case 234:
-                    case 193:
-                        if (meaning & 3 && name === "arguments") {
+                    case 154 /* MethodDeclaration */:
+                    case 153 /* MethodSignature */:
+                    case 155 /* Constructor */:
+                    case 156 /* GetAccessor */:
+                    case 157 /* SetAccessor */:
+                    case 234 /* FunctionDeclaration */:
+                    case 193 /* ArrowFunction */:
+                        if (meaning & 3 /* Variable */ && name === "arguments") {
                             result = argumentsSymbol;
                             break loop;
                         }
                         break;
-                    case 192:
-                        if (meaning & 3 && name === "arguments") {
+                    case 192 /* FunctionExpression */:
+                        if (meaning & 3 /* Variable */ && name === "arguments") {
                             result = argumentsSymbol;
                             break loop;
                         }
-                        if (meaning & 16) {
+                        if (meaning & 16 /* Function */) {
                             var functionName = location.name;
                             if (functionName && name === functionName.escapedText) {
                                 result = location.symbol;
@@ -23980,16 +30298,31 @@ var ts;
                             }
                         }
                         break;
-                    case 150:
-                        if (location.parent && location.parent.kind === 149) {
+                    case 150 /* Decorator */:
+                        // Decorators are resolved at the class declaration. Resolving at the parameter
+                        // or member would result in looking up locals in the method.
+                        //
+                        //   function y() {}
+                        //   class C {
+                        //       method(@y x, y) {} // <-- decorator y should be resolved at the class declaration, not the parameter.
+                        //   }
+                        //
+                        if (location.parent && location.parent.kind === 149 /* Parameter */) {
                             location = location.parent;
                         }
+                        //
+                        //   function y() {}
+                        //   class C {
+                        //       @y method(x, y) {} // <-- decorator y should be resolved at the class declaration, not the method.
+                        //   }
+                        //
                         if (location.parent && ts.isClassElement(location.parent)) {
                             location = location.parent;
                         }
                         break;
-                    case 297:
-                    case 292:
+                    case 297 /* JSDocTypedefTag */:
+                    case 292 /* JSDocCallbackTag */:
+                        // js type aliases do not resolve names from their host, so skip past it
                         location = ts.getJSDocHost(location);
                         break;
                 }
@@ -23999,12 +30332,15 @@ var ts;
                 lastLocation = location;
                 location = location.parent;
             }
+            // We just climbed up parents looking for the name, meaning that we started in a descendant node of `lastLocation`.
+            // If `result === lastSelfReferenceLocation.symbol`, that means that we are somewhere inside `lastSelfReferenceLocation` looking up a name, and resolving to `lastLocation` itself.
+            // That means that this is a self-reference of `lastLocation`, and shouldn't count this when considering whether `lastLocation` is used.
             if (isUse && result && (!lastSelfReferenceLocation || result !== lastSelfReferenceLocation.symbol)) {
                 result.isReferenced |= meaning;
             }
             if (!result) {
                 if (lastLocation) {
-                    ts.Debug.assert(lastLocation.kind === 274);
+                    ts.Debug.assert(lastLocation.kind === 274 /* SourceFile */);
                     if (lastLocation.commonJsModuleIndicator && name === "exports") {
                         return lastLocation.symbol;
                     }
@@ -24015,7 +30351,7 @@ var ts;
             }
             if (!result) {
                 if (originalLocation && ts.isInJavaScriptFile(originalLocation) && originalLocation.parent) {
-                    if (ts.isRequireCall(originalLocation.parent, false)) {
+                    if (ts.isRequireCall(originalLocation.parent, /*checkArgumentIsStringLiteralLike*/ false)) {
                         return requireSymbol;
                     }
                     if (ts.isIdentifier(originalLocation) && ts.isPropertyAccessExpression(originalLocation.parent) &&
@@ -24027,7 +30363,7 @@ var ts;
             if (!result) {
                 if (nameNotFoundMessage) {
                     if (!errorLocation ||
-                        !checkAndReportErrorForMissingPrefix(errorLocation, name, nameArg) &&
+                        !checkAndReportErrorForMissingPrefix(errorLocation, name, nameArg) && // TODO: GH#18217
                             !checkAndReportErrorForExtendingInterface(errorLocation) &&
                             !checkAndReportErrorForUsingTypeAsNamespace(errorLocation, name, meaning) &&
                             !checkAndReportErrorForUsingTypeAsValue(errorLocation, name, meaning) &&
@@ -24047,24 +30383,39 @@ var ts;
                 }
                 return undefined;
             }
+            // Perform extra checks only if error reporting was requested
             if (nameNotFoundMessage) {
                 if (propertyWithInvalidInitializer) {
+                    // We have a match, but the reference occurred within a property initializer and the identifier also binds
+                    // to a local variable in the constructor where the code will be emitted.
                     var propertyName = propertyWithInvalidInitializer.name;
                     error(errorLocation, ts.Diagnostics.Initializer_of_instance_member_variable_0_cannot_reference_identifier_1_declared_in_the_constructor, ts.declarationNameToString(propertyName), diagnosticName(nameArg));
                     return undefined;
                 }
+                // Only check for block-scoped variable if we have an error location and are looking for the
+                // name with variable meaning
+                //      For example,
+                //          declare module foo {
+                //              interface bar {}
+                //          }
+                //      const foo/*1*/: foo/*2*/.bar;
+                // The foo at /*1*/ and /*2*/ will share same symbol with two meanings:
+                // block-scoped variable and namespace module. However, only when we
+                // try to resolve name in /*1*/ which is used in variable position,
+                // we want to check for block-scoped
                 if (errorLocation &&
-                    (meaning & 2 ||
-                        ((meaning & 32 || meaning & 384) && (meaning & 67216319) === 67216319))) {
+                    (meaning & 2 /* BlockScopedVariable */ ||
+                        ((meaning & 32 /* Class */ || meaning & 384 /* Enum */) && (meaning & 67216319 /* Value */) === 67216319 /* Value */))) {
                     var exportOrLocalSymbol = getExportSymbolOfValueSymbolIfExported(result);
-                    if (exportOrLocalSymbol.flags & 2 || exportOrLocalSymbol.flags & 32 || exportOrLocalSymbol.flags & 384) {
+                    if (exportOrLocalSymbol.flags & 2 /* BlockScopedVariable */ || exportOrLocalSymbol.flags & 32 /* Class */ || exportOrLocalSymbol.flags & 384 /* Enum */) {
                         checkResolvedBlockScopedVariable(exportOrLocalSymbol, errorLocation);
                     }
                 }
-                if (result && isInExternalModule && (meaning & 67216319) === 67216319 && !(originalLocation.flags & 2097152)) {
+                // If we're in an external module, we can't reference value symbols created from UMD export declarations
+                if (result && isInExternalModule && (meaning & 67216319 /* Value */) === 67216319 /* Value */ && !(originalLocation.flags & 2097152 /* JSDoc */)) {
                     var decls = result.declarations;
-                    if (decls && decls.length === 1 && decls[0].kind === 242) {
-                        error(errorLocation, ts.Diagnostics._0_refers_to_a_UMD_global_but_the_current_file_is_a_module_Consider_adding_an_import_instead, ts.unescapeLeadingUnderscores(name));
+                    if (decls && decls.length === 1 && decls[0].kind === 242 /* NamespaceExportDeclaration */) {
+                        error(errorLocation, ts.Diagnostics._0_refers_to_a_UMD_global_but_the_current_file_is_a_module_Consider_adding_an_import_instead, ts.unescapeLeadingUnderscores(name)); // TODO: GH#18217
                     }
                 }
             }
@@ -24072,12 +30423,12 @@ var ts;
         }
         function isSelfReferenceLocation(node) {
             switch (node.kind) {
-                case 234:
-                case 235:
-                case 236:
-                case 238:
-                case 237:
-                case 239:
+                case 234 /* FunctionDeclaration */:
+                case 235 /* ClassDeclaration */:
+                case 236 /* InterfaceDeclaration */:
+                case 238 /* EnumDeclaration */:
+                case 237 /* TypeAliasDeclaration */:
+                case 239 /* ModuleDeclaration */: // For `namespace N { N; }`
                     return true;
                 default:
                     return false;
@@ -24089,10 +30440,10 @@ var ts;
         function isTypeParameterSymbolDeclaredInContainer(symbol, container) {
             for (var _i = 0, _a = symbol.declarations; _i < _a.length; _i++) {
                 var decl = _a[_i];
-                if (decl.kind === 148) {
+                if (decl.kind === 148 /* TypeParameter */) {
                     var parent = ts.isJSDocTemplateTag(decl.parent) ? ts.getJSDocHost(decl.parent) : decl.parent;
                     if (parent === container) {
-                        return !(ts.isJSDocTemplateTag(decl.parent) && ts.find(decl.parent.parent.tags, ts.isJSDocTypeAlias));
+                        return !(ts.isJSDocTemplateTag(decl.parent) && ts.find(decl.parent.parent.tags, ts.isJSDocTypeAlias)); // TODO: GH#18217
                     }
                 }
             }
@@ -24102,7 +30453,7 @@ var ts;
             if (!ts.isIdentifier(errorLocation) || errorLocation.escapedText !== name || isTypeReferenceIdentifier(errorLocation) || isInTypeQuery(errorLocation)) {
                 return false;
             }
-            var container = ts.getThisContainer(errorLocation, false);
+            var container = ts.getThisContainer(errorLocation, /*includeArrowFunctions*/ false);
             var location = container;
             while (location) {
                 if (ts.isClassLike(location.parent)) {
@@ -24110,13 +30461,16 @@ var ts;
                     if (!classSymbol) {
                         break;
                     }
+                    // Check to see if a static member exists.
                     var constructorType = getTypeOfSymbol(classSymbol);
                     if (getPropertyOfType(constructorType, name)) {
                         error(errorLocation, ts.Diagnostics.Cannot_find_name_0_Did_you_mean_the_static_member_1_0, diagnosticName(nameArg), symbolToString(classSymbol));
                         return true;
                     }
-                    if (location === container && !ts.hasModifier(location, 32)) {
-                        var instanceType = getDeclaredTypeOfSymbol(classSymbol).thisType;
+                    // No static member is present.
+                    // Check if we're in an instance method and look for a relevant instance member.
+                    if (location === container && !ts.hasModifier(location, 32 /* Static */)) {
+                        var instanceType = getDeclaredTypeOfSymbol(classSymbol).thisType; // TODO: GH#18217
                         if (getPropertyOfType(instanceType, name)) {
                             error(errorLocation, ts.Diagnostics.Cannot_find_name_0_Did_you_mean_the_instance_member_this_0, diagnosticName(nameArg));
                             return true;
@@ -24129,29 +30483,34 @@ var ts;
         }
         function checkAndReportErrorForExtendingInterface(errorLocation) {
             var expression = getEntityNameForExtendingInterface(errorLocation);
-            if (expression && resolveEntityName(expression, 64, true)) {
+            if (expression && resolveEntityName(expression, 64 /* Interface */, /*ignoreErrors*/ true)) {
                 error(errorLocation, ts.Diagnostics.Cannot_extend_an_interface_0_Did_you_mean_implements, ts.getTextOfNode(expression));
                 return true;
             }
             return false;
         }
+        /**
+         * Climbs up parents to an ExpressionWithTypeArguments, and returns its expression,
+         * but returns undefined if that expression is not an EntityNameExpression.
+         */
         function getEntityNameForExtendingInterface(node) {
             switch (node.kind) {
-                case 71:
-                case 185:
+                case 71 /* Identifier */:
+                case 185 /* PropertyAccessExpression */:
                     return node.parent ? getEntityNameForExtendingInterface(node.parent) : undefined;
-                case 207:
+                case 207 /* ExpressionWithTypeArguments */:
                     if (ts.isEntityNameExpression(node.expression)) {
                         return node.expression;
                     }
+                // falls through
                 default:
                     return undefined;
             }
         }
         function checkAndReportErrorForUsingTypeAsNamespace(errorLocation, name, meaning) {
-            var namespaceMeaning = 1920 | (ts.isInJavaScriptFile(errorLocation) ? 67216319 : 0);
+            var namespaceMeaning = 1920 /* Namespace */ | (ts.isInJavaScriptFile(errorLocation) ? 67216319 /* Value */ : 0);
             if (meaning === namespaceMeaning) {
-                var symbol = resolveSymbol(resolveName(errorLocation, name, 67901928 & ~namespaceMeaning, undefined, undefined, false));
+                var symbol = resolveSymbol(resolveName(errorLocation, name, 67901928 /* Type */ & ~namespaceMeaning, /*nameNotFoundMessage*/ undefined, /*nameArg*/ undefined, /*isUse*/ false));
                 var parent = errorLocation.parent;
                 if (symbol) {
                     if (ts.isQualifiedName(parent)) {
@@ -24170,13 +30529,13 @@ var ts;
             return false;
         }
         function checkAndReportErrorForUsingTypeAsValue(errorLocation, name, meaning) {
-            if (meaning & (67216319 & ~1024)) {
+            if (meaning & (67216319 /* Value */ & ~1024 /* NamespaceModule */)) {
                 if (name === "any" || name === "string" || name === "number" || name === "boolean" || name === "never") {
                     error(errorLocation, ts.Diagnostics._0_only_refers_to_a_type_but_is_being_used_as_a_value_here, ts.unescapeLeadingUnderscores(name));
                     return true;
                 }
-                var symbol = resolveSymbol(resolveName(errorLocation, name, 67901928 & ~67216319, undefined, undefined, false));
-                if (symbol && !(symbol.flags & 1024)) {
+                var symbol = resolveSymbol(resolveName(errorLocation, name, 67901928 /* Type */ & ~67216319 /* Value */, /*nameNotFoundMessage*/ undefined, /*nameArg*/ undefined, /*isUse*/ false));
+                if (symbol && !(symbol.flags & 1024 /* NamespaceModule */)) {
                     error(errorLocation, ts.Diagnostics._0_only_refers_to_a_type_but_is_being_used_as_a_value_here, ts.unescapeLeadingUnderscores(name));
                     return true;
                 }
@@ -24184,15 +30543,15 @@ var ts;
             return false;
         }
         function checkAndReportErrorForUsingNamespaceModuleAsValue(errorLocation, name, meaning) {
-            if (meaning & (67216319 & ~1024 & ~67901928)) {
-                var symbol = resolveSymbol(resolveName(errorLocation, name, 1024 & ~67216319, undefined, undefined, false));
+            if (meaning & (67216319 /* Value */ & ~1024 /* NamespaceModule */ & ~67901928 /* Type */)) {
+                var symbol = resolveSymbol(resolveName(errorLocation, name, 1024 /* NamespaceModule */ & ~67216319 /* Value */, /*nameNotFoundMessage*/ undefined, /*nameArg*/ undefined, /*isUse*/ false));
                 if (symbol) {
                     error(errorLocation, ts.Diagnostics.Cannot_use_namespace_0_as_a_value, ts.unescapeLeadingUnderscores(name));
                     return true;
                 }
             }
-            else if (meaning & (67901928 & ~1024 & ~67216319)) {
-                var symbol = resolveSymbol(resolveName(errorLocation, name, (512 | 1024) & ~67901928, undefined, undefined, false));
+            else if (meaning & (67901928 /* Type */ & ~1024 /* NamespaceModule */ & ~67216319 /* Value */)) {
+                var symbol = resolveSymbol(resolveName(errorLocation, name, (512 /* ValueModule */ | 1024 /* NamespaceModule */) & ~67901928 /* Type */, /*nameNotFoundMessage*/ undefined, /*nameArg*/ undefined, /*isUse*/ false));
                 if (symbol) {
                     error(errorLocation, ts.Diagnostics.Cannot_use_namespace_0_as_a_type, ts.unescapeLeadingUnderscores(name));
                     return true;
@@ -24201,34 +30560,39 @@ var ts;
             return false;
         }
         function checkResolvedBlockScopedVariable(result, errorLocation) {
-            ts.Debug.assert(!!(result.flags & 2 || result.flags & 32 || result.flags & 384));
-            var declaration = ts.forEach(result.declarations, function (d) { return ts.isBlockOrCatchScoped(d) || ts.isClassLike(d) || (d.kind === 238) ? d : undefined; });
+            ts.Debug.assert(!!(result.flags & 2 /* BlockScopedVariable */ || result.flags & 32 /* Class */ || result.flags & 384 /* Enum */));
+            // Block-scoped variables cannot be used before their definition
+            var declaration = ts.forEach(result.declarations, function (d) { return ts.isBlockOrCatchScoped(d) || ts.isClassLike(d) || (d.kind === 238 /* EnumDeclaration */) ? d : undefined; });
             if (declaration === undefined)
                 return ts.Debug.fail("Declaration to checkResolvedBlockScopedVariable is undefined");
-            if (!(declaration.flags & 4194304) && !isBlockScopedNameDeclaredBeforeUse(declaration, errorLocation)) {
-                if (result.flags & 2) {
+            if (!(declaration.flags & 4194304 /* Ambient */) && !isBlockScopedNameDeclaredBeforeUse(declaration, errorLocation)) {
+                if (result.flags & 2 /* BlockScopedVariable */) {
                     error(errorLocation, ts.Diagnostics.Block_scoped_variable_0_used_before_its_declaration, ts.declarationNameToString(ts.getNameOfDeclaration(declaration)));
                 }
-                else if (result.flags & 32) {
+                else if (result.flags & 32 /* Class */) {
                     error(errorLocation, ts.Diagnostics.Class_0_used_before_its_declaration, ts.declarationNameToString(ts.getNameOfDeclaration(declaration)));
                 }
-                else if (result.flags & 256) {
+                else if (result.flags & 256 /* RegularEnum */) {
                     error(errorLocation, ts.Diagnostics.Enum_0_used_before_its_declaration, ts.declarationNameToString(ts.getNameOfDeclaration(declaration)));
                 }
             }
         }
+        /* Starting from 'initial' node walk up the parent chain until 'stopAt' node is reached.
+         * If at any point current node is equal to 'parent' node - return true.
+         * Return false if 'stopAt' node is reached or isFunctionLike(current) === true.
+         */
         function isSameScopeDescendentOf(initial, parent, stopAt) {
             return !!parent && !!ts.findAncestor(initial, function (n) { return n === stopAt || ts.isFunctionLike(n) ? "quit" : n === parent; });
         }
         function getAnyImportSyntax(node) {
             switch (node.kind) {
-                case 243:
+                case 243 /* ImportEqualsDeclaration */:
                     return node;
-                case 245:
+                case 245 /* ImportClause */:
                     return node.parent;
-                case 246:
+                case 246 /* NamespaceImport */:
                     return node.parent.parent;
-                case 248:
+                case 248 /* ImportSpecifier */:
                     return node.parent.parent.parent;
                 default:
                     return undefined;
@@ -24238,37 +30602,48 @@ var ts;
             return ts.find(symbol.declarations, ts.isAliasSymbolDeclaration);
         }
         function getTargetOfImportEqualsDeclaration(node, dontResolveAlias) {
-            if (node.moduleReference.kind === 254) {
+            if (node.moduleReference.kind === 254 /* ExternalModuleReference */) {
                 return resolveExternalModuleSymbol(resolveExternalModuleName(node, ts.getExternalModuleImportEqualsDeclarationExpression(node)));
             }
             return getSymbolOfPartOfRightHandSideOfImportEquals(node.moduleReference, dontResolveAlias);
         }
         function resolveExportByName(moduleSymbol, name, dontResolveAlias) {
-            var exportValue = moduleSymbol.exports.get("export=");
+            var exportValue = moduleSymbol.exports.get("export=" /* ExportEquals */);
             return exportValue
                 ? getPropertyOfType(getTypeOfSymbol(exportValue), name)
                 : resolveSymbol(moduleSymbol.exports.get(name), dontResolveAlias);
         }
         function isSyntacticDefault(node) {
-            return ((ts.isExportAssignment(node) && !node.isExportEquals) || ts.hasModifier(node, 512) || ts.isExportSpecifier(node));
+            return ((ts.isExportAssignment(node) && !node.isExportEquals) || ts.hasModifier(node, 512 /* Default */) || ts.isExportSpecifier(node));
         }
         function canHaveSyntheticDefault(file, moduleSymbol, dontResolveAlias) {
             if (!allowSyntheticDefaultImports) {
                 return false;
             }
+            // Declaration files (and ambient modules)
             if (!file || file.isDeclarationFile) {
-                var defaultExportSymbol = resolveExportByName(moduleSymbol, "default", true);
+                // Definitely cannot have a synthetic default if they have a syntactic default member specified
+                var defaultExportSymbol = resolveExportByName(moduleSymbol, "default" /* Default */, /*dontResolveAlias*/ true); // Dont resolve alias because we want the immediately exported symbol's declaration
                 if (defaultExportSymbol && ts.some(defaultExportSymbol.declarations, isSyntacticDefault)) {
                     return false;
                 }
+                // It _might_ still be incorrect to assume there is no __esModule marker on the import at runtime, even if there is no `default` member
+                // So we check a bit more,
                 if (resolveExportByName(moduleSymbol, ts.escapeLeadingUnderscores("__esModule"), dontResolveAlias)) {
+                    // If there is an `__esModule` specified in the declaration (meaning someone explicitly added it or wrote it in their code),
+                    // it definitely is a module and does not have a synthetic default
                     return false;
                 }
+                // There are _many_ declaration files not written with esmodules in mind that still get compiled into a format with __esModule set
+                // Meaning there may be no default at runtime - however to be on the permissive side, we allow access to a synthetic default member
+                // as there is no marker to indicate if the accompanying JS has `__esModule` or not, or is even native esm
                 return true;
             }
+            // TypeScript files never have a synthetic default (as they are always emitted with an __esModule marker) _unless_ they contain an export= statement
             if (!ts.isSourceFileJavaScript(file)) {
                 return hasExportAssignmentSymbol(moduleSymbol);
             }
+            // JS files have a synthetic default if they do not contain ES2015+ module syntax (export = is not valid in js) _and_ do not have an __esModule marker
             return !file.externalModuleIndicator && !resolveExportByName(moduleSymbol, ts.escapeLeadingUnderscores("__esModule"), dontResolveAlias);
         }
         function getTargetOfImportClause(node, dontResolveAlias) {
@@ -24279,7 +30654,7 @@ var ts;
                     exportDefaultSymbol = moduleSymbol;
                 }
                 else {
-                    exportDefaultSymbol = resolveExportByName(moduleSymbol, "default", dontResolveAlias);
+                    exportDefaultSymbol = resolveExportByName(moduleSymbol, "default" /* Default */, dontResolveAlias);
                 }
                 var file = ts.find(moduleSymbol.declarations, ts.isSourceFile);
                 var hasSyntheticDefault = canHaveSyntheticDefault(file, moduleSymbol, dontResolveAlias);
@@ -24287,6 +30662,7 @@ var ts;
                     error(node.name, ts.Diagnostics.Module_0_has_no_default_export, symbolToString(moduleSymbol));
                 }
                 else if (hasSyntheticDefault) {
+                    // per emit behavior, a synthetic default overrides a "real" .default member if `__esModule` is not present
                     return resolveExternalModuleSymbol(moduleSymbol, dontResolveAlias) || resolveSymbol(moduleSymbol, dontResolveAlias);
                 }
                 return exportDefaultSymbol;
@@ -24296,11 +30672,29 @@ var ts;
             var moduleSpecifier = node.parent.parent.moduleSpecifier;
             return resolveESModuleSymbol(resolveExternalModuleName(node, moduleSpecifier), moduleSpecifier, dontResolveAlias);
         }
+        // This function creates a synthetic symbol that combines the value side of one symbol with the
+        // type/namespace side of another symbol. Consider this example:
+        //
+        //   declare module graphics {
+        //       interface Point {
+        //           x: number;
+        //           y: number;
+        //       }
+        //   }
+        //   declare var graphics: {
+        //       Point: new (x: number, y: number) => graphics.Point;
+        //   }
+        //   declare module "graphics" {
+        //       export = graphics;
+        //   }
+        //
+        // An 'import { Point } from "graphics"' needs to create a symbol that combines the value side 'Point'
+        // property with the type/namespace side interface 'Point'.
         function combineValueAndTypeSymbols(valueSymbol, typeSymbol) {
             if (valueSymbol === unknownSymbol && typeSymbol === unknownSymbol) {
                 return unknownSymbol;
             }
-            if (valueSymbol.flags & (67901928 | 1920)) {
+            if (valueSymbol.flags & (67901928 /* Type */ | 1920 /* Namespace */)) {
                 return valueSymbol;
             }
             var result = createSymbol(valueSymbol.flags | typeSymbol.flags, valueSymbol.escapedName);
@@ -24315,21 +30709,21 @@ var ts;
             return result;
         }
         function getExportOfModule(symbol, name, dontResolveAlias) {
-            if (symbol.flags & 1536) {
+            if (symbol.flags & 1536 /* Module */) {
                 return resolveSymbol(getExportsOfSymbol(symbol).get(name), dontResolveAlias);
             }
         }
         function getPropertyOfVariable(symbol, name) {
-            if (symbol.flags & 3) {
+            if (symbol.flags & 3 /* Variable */) {
                 var typeAnnotation = symbol.valueDeclaration.type;
                 if (typeAnnotation) {
-                    return resolveSymbol(getPropertyOfType(getTypeFromTypeNode(typeAnnotation), name));
+                    return resolveSymbol(getPropertyOfType(getTypeFromTypeNode(typeAnnotation), name)); // TODO: GH#18217
                 }
             }
         }
         function getExternalModuleMember(node, specifier, dontResolveAlias) {
             if (dontResolveAlias === void 0) { dontResolveAlias = false; }
-            var moduleSymbol = resolveExternalModuleName(node, node.moduleSpecifier);
+            var moduleSymbol = resolveExternalModuleName(node, node.moduleSpecifier); // TODO: GH#18217
             var targetSymbol = resolveESModuleSymbol(moduleSymbol, node.moduleSpecifier, dontResolveAlias);
             if (targetSymbol) {
                 var name = specifier.propertyName || specifier.name;
@@ -24338,15 +30732,18 @@ var ts;
                         return moduleSymbol;
                     }
                     var symbolFromVariable = void 0;
-                    if (moduleSymbol && moduleSymbol.exports && moduleSymbol.exports.get("export=")) {
+                    // First check if module was specified with "export=". If so, get the member from the resolved type
+                    if (moduleSymbol && moduleSymbol.exports && moduleSymbol.exports.get("export=" /* ExportEquals */)) {
                         symbolFromVariable = getPropertyOfType(getTypeOfSymbol(targetSymbol), name.escapedText);
                     }
                     else {
                         symbolFromVariable = getPropertyOfVariable(targetSymbol, name.escapedText);
                     }
+                    // if symbolFromVariable is export - get its final target
                     symbolFromVariable = resolveSymbol(symbolFromVariable, dontResolveAlias);
                     var symbolFromModule = getExportOfModule(targetSymbol, name.escapedText, dontResolveAlias);
-                    if (!symbolFromModule && allowSyntheticDefaultImports && name.escapedText === "default") {
+                    // If the export member we're looking for is default, and there is no real default but allowSyntheticDefaultImports is on, return the entire module as the default
+                    if (!symbolFromModule && allowSyntheticDefaultImports && name.escapedText === "default" /* Default */) {
                         symbolFromModule = resolveExternalModuleSymbol(moduleSymbol, dontResolveAlias) || resolveSymbol(moduleSymbol, dontResolveAlias);
                     }
                     var symbol = symbolFromModule && symbolFromVariable && symbolFromModule !== symbolFromVariable ?
@@ -24376,14 +30773,14 @@ var ts;
         function getTargetOfExportSpecifier(node, meaning, dontResolveAlias) {
             return node.parent.parent.moduleSpecifier ?
                 getExternalModuleMember(node.parent.parent, node, dontResolveAlias) :
-                resolveEntityName(node.propertyName || node.name, meaning, false, dontResolveAlias);
+                resolveEntityName(node.propertyName || node.name, meaning, /*ignoreErrors*/ false, dontResolveAlias);
         }
         function getTargetOfExportAssignment(node, dontResolveAlias) {
             var expression = (ts.isExportAssignment(node) ? node.expression : node.right);
             if (ts.isClassExpression(expression)) {
                 return checkExpression(expression).symbol;
             }
-            var aliasLike = resolveEntityName(expression, 67216319 | 67901928 | 1920, true, dontResolveAlias);
+            var aliasLike = resolveEntityName(expression, 67216319 /* Value */ | 67901928 /* Type */ | 1920 /* Namespace */, /*ignoreErrors*/ true, dontResolveAlias);
             if (aliasLike) {
                 return aliasLike;
             }
@@ -24393,36 +30790,40 @@ var ts;
         function getTargetOfAliasDeclaration(node, dontRecursivelyResolve) {
             if (dontRecursivelyResolve === void 0) { dontRecursivelyResolve = false; }
             switch (node.kind) {
-                case 243:
+                case 243 /* ImportEqualsDeclaration */:
                     return getTargetOfImportEqualsDeclaration(node, dontRecursivelyResolve);
-                case 245:
+                case 245 /* ImportClause */:
                     return getTargetOfImportClause(node, dontRecursivelyResolve);
-                case 246:
+                case 246 /* NamespaceImport */:
                     return getTargetOfNamespaceImport(node, dontRecursivelyResolve);
-                case 248:
+                case 248 /* ImportSpecifier */:
                     return getTargetOfImportSpecifier(node, dontRecursivelyResolve);
-                case 252:
-                    return getTargetOfExportSpecifier(node, 67216319 | 67901928 | 1920, dontRecursivelyResolve);
-                case 249:
-                case 200:
+                case 252 /* ExportSpecifier */:
+                    return getTargetOfExportSpecifier(node, 67216319 /* Value */ | 67901928 /* Type */ | 1920 /* Namespace */, dontRecursivelyResolve);
+                case 249 /* ExportAssignment */:
+                case 200 /* BinaryExpression */:
                     return getTargetOfExportAssignment(node, dontRecursivelyResolve);
-                case 242:
+                case 242 /* NamespaceExportDeclaration */:
                     return getTargetOfNamespaceExportDeclaration(node, dontRecursivelyResolve);
                 default:
                     return ts.Debug.fail();
             }
         }
+        /**
+         * Indicates that a symbol is an alias that does not merge with a local declaration.
+         * OR Is a JSContainer which may merge an alias with a local declaration
+         */
         function isNonLocalAlias(symbol, excludes) {
-            if (excludes === void 0) { excludes = 67216319 | 67901928 | 1920; }
+            if (excludes === void 0) { excludes = 67216319 /* Value */ | 67901928 /* Type */ | 1920 /* Namespace */; }
             if (!symbol)
                 return false;
-            return (symbol.flags & (2097152 | excludes)) === 2097152 || !!(symbol.flags & 2097152 && symbol.flags & 67108864);
+            return (symbol.flags & (2097152 /* Alias */ | excludes)) === 2097152 /* Alias */ || !!(symbol.flags & 2097152 /* Alias */ && symbol.flags & 67108864 /* JSContainer */);
         }
         function resolveSymbol(symbol, dontResolveAlias) {
             return !dontResolveAlias && isNonLocalAlias(symbol) ? resolveAlias(symbol) : symbol;
         }
         function resolveAlias(symbol) {
-            ts.Debug.assert((symbol.flags & 2097152) !== 0, "Should only get Alias here.");
+            ts.Debug.assert((symbol.flags & 2097152 /* Alias */) !== 0, "Should only get Alias here.");
             var links = getSymbolLinks(symbol);
             if (!links.target) {
                 links.target = resolvingSymbol;
@@ -24447,12 +30848,15 @@ var ts;
             var target = resolveAlias(symbol);
             if (target) {
                 var markAlias = target === unknownSymbol ||
-                    ((target.flags & 67216319) && !isConstEnumOrConstEnumOnlyModule(target));
+                    ((target.flags & 67216319 /* Value */) && !isConstEnumOrConstEnumOnlyModule(target));
                 if (markAlias) {
                     markAliasSymbolAsReferenced(symbol);
                 }
             }
         }
+        // When an alias symbol is referenced, we need to mark the entity it references as referenced and in turn repeat that until
+        // we reach a non-alias or an exported entity (which is always considered referenced). We do this by checking the target of
+        // the alias as an expression (which recursively takes us back here if the target references another alias).
         function markAliasSymbolAsReferenced(symbol) {
             var links = getSymbolLinks(symbol);
             if (!links.referenced) {
@@ -24460,50 +30864,66 @@ var ts;
                 var node = getDeclarationOfAliasSymbol(symbol);
                 if (!node)
                     return ts.Debug.fail();
-                if (node.kind === 249) {
+                if (node.kind === 249 /* ExportAssignment */) {
+                    // export default <symbol>
                     checkExpressionCached(node.expression);
                 }
-                else if (node.kind === 252) {
+                else if (node.kind === 252 /* ExportSpecifier */) {
+                    // export { <symbol> } or export { <symbol> as foo }
                     checkExpressionCached(node.propertyName || node.name);
                 }
                 else if (ts.isInternalModuleImportEqualsDeclaration(node)) {
+                    // import foo = <symbol>
                     checkExpressionCached(node.moduleReference);
                 }
             }
         }
+        // This function is only for imports with entity names
         function getSymbolOfPartOfRightHandSideOfImportEquals(entityName, dontResolveAlias) {
-            if (entityName.kind === 71 && ts.isRightSideOfQualifiedNameOrPropertyAccess(entityName)) {
+            // There are three things we might try to look for. In the following examples,
+            // the search term is enclosed in |...|:
+            //
+            //     import a = |b|; // Namespace
+            //     import a = |b.c|; // Value, type, namespace
+            //     import a = |b.c|.d; // Namespace
+            if (entityName.kind === 71 /* Identifier */ && ts.isRightSideOfQualifiedNameOrPropertyAccess(entityName)) {
                 entityName = entityName.parent;
             }
-            if (entityName.kind === 71 || entityName.parent.kind === 146) {
-                return resolveEntityName(entityName, 1920, false, dontResolveAlias);
+            // Check for case 1 and 3 in the above example
+            if (entityName.kind === 71 /* Identifier */ || entityName.parent.kind === 146 /* QualifiedName */) {
+                return resolveEntityName(entityName, 1920 /* Namespace */, /*ignoreErrors*/ false, dontResolveAlias);
             }
             else {
-                ts.Debug.assert(entityName.parent.kind === 243);
-                return resolveEntityName(entityName, 67216319 | 67901928 | 1920, false, dontResolveAlias);
+                // Case 2 in above example
+                // entityName.kind could be a QualifiedName or a Missing identifier
+                ts.Debug.assert(entityName.parent.kind === 243 /* ImportEqualsDeclaration */);
+                return resolveEntityName(entityName, 67216319 /* Value */ | 67901928 /* Type */ | 1920 /* Namespace */, /*ignoreErrors*/ false, dontResolveAlias);
             }
         }
         function getFullyQualifiedName(symbol) {
             return symbol.parent ? getFullyQualifiedName(symbol.parent) + "." + symbolToString(symbol) : symbolToString(symbol);
         }
+        /**
+         * Resolves a qualified name and any involved aliases.
+         */
         function resolveEntityName(name, meaning, ignoreErrors, dontResolveAlias, location) {
             if (ts.nodeIsMissing(name)) {
                 return undefined;
             }
-            var namespaceMeaning = 1920 | (ts.isInJavaScriptFile(name) ? meaning & 67216319 : 0);
+            var namespaceMeaning = 1920 /* Namespace */ | (ts.isInJavaScriptFile(name) ? meaning & 67216319 /* Value */ : 0);
             var symbol;
-            if (name.kind === 71) {
+            if (name.kind === 71 /* Identifier */) {
                 var message = meaning === namespaceMeaning ? ts.Diagnostics.Cannot_find_namespace_0 : ts.Diagnostics.Cannot_find_name_0;
                 var symbolFromJSPrototype = ts.isInJavaScriptFile(name) ? resolveEntityNameFromJSSpecialAssignment(name, meaning) : undefined;
-                symbol = resolveName(location || name, name.escapedText, meaning, ignoreErrors || symbolFromJSPrototype ? undefined : message, name, true);
+                symbol = resolveName(location || name, name.escapedText, meaning, ignoreErrors || symbolFromJSPrototype ? undefined : message, name, /*isUse*/ true);
                 if (!symbol) {
                     return symbolFromJSPrototype;
                 }
             }
-            else if (name.kind === 146 || name.kind === 185) {
-                var left = name.kind === 146 ? name.left : name.expression;
-                var right = name.kind === 146 ? name.right : name.name;
-                var namespace = resolveEntityName(left, namespaceMeaning, ignoreErrors, false, location);
+            else if (name.kind === 146 /* QualifiedName */ || name.kind === 185 /* PropertyAccessExpression */) {
+                var left = name.kind === 146 /* QualifiedName */ ? name.left : name.expression;
+                var right = name.kind === 146 /* QualifiedName */ ? name.right : name.name;
+                var namespace = resolveEntityName(left, namespaceMeaning, ignoreErrors, /*dontResolveAlias*/ false, location);
                 if (!namespace || ts.nodeIsMissing(right)) {
                     return undefined;
                 }
@@ -24536,26 +30956,32 @@ var ts;
             else {
                 throw ts.Debug.assertNever(name, "Unknown entity name kind.");
             }
-            ts.Debug.assert((ts.getCheckFlags(symbol) & 1) === 0, "Should never get an instantiated symbol here.");
+            ts.Debug.assert((ts.getCheckFlags(symbol) & 1 /* Instantiated */) === 0, "Should never get an instantiated symbol here.");
             return (symbol.flags & meaning) || dontResolveAlias ? symbol : resolveAlias(symbol);
         }
+        /**
+         * 1. For prototype-property methods like `A.prototype.m = function () ...`, try to resolve names in the scope of `A` too.
+         * Note that prototype-property assignment to locations outside the current file (eg globals) doesn't work, so
+         * name resolution won't work either.
+         * 2. For property assignments like `{ x: function f () { } }`, try to resolve names in the scope of `f` too.
+         */
         function resolveEntityNameFromJSSpecialAssignment(name, meaning) {
             if (isJSDocTypeReference(name.parent)) {
                 var secondaryLocation = getJSSpecialAssignmentLocation(name.parent);
                 if (secondaryLocation) {
-                    return resolveName(secondaryLocation, name.escapedText, meaning, undefined, name, true);
+                    return resolveName(secondaryLocation, name.escapedText, meaning, /*nameNotFoundMessage*/ undefined, name, /*isUse*/ true);
                 }
             }
         }
         function getJSSpecialAssignmentLocation(node) {
-            var typeAlias = ts.findAncestor(node, function (node) { return !(ts.isJSDocNode(node) || node.flags & 2097152) ? "quit" : ts.isJSDocTypeAlias(node); });
+            var typeAlias = ts.findAncestor(node, function (node) { return !(ts.isJSDocNode(node) || node.flags & 2097152 /* JSDoc */) ? "quit" : ts.isJSDocTypeAlias(node); });
             if (typeAlias) {
                 return;
             }
             var host = ts.getJSDocHost(node);
             if (ts.isExpressionStatement(host) &&
                 ts.isBinaryExpression(host.expression) &&
-                ts.getSpecialPropertyAssignmentKind(host.expression) === 3) {
+                ts.getSpecialPropertyAssignmentKind(host.expression) === 3 /* PrototypeProperty */) {
                 var symbol = getSymbolOfNode(host.expression.left);
                 return symbol && symbol.parent.valueDeclaration;
             }
@@ -24584,22 +31010,24 @@ var ts;
                 var withoutAtTypePrefix = ts.removePrefix(moduleReference, "@types/");
                 error(errorNode, diag, withoutAtTypePrefix, moduleReference);
             }
-            var ambientModule = tryFindAmbientModule(moduleReference, true);
+            var ambientModule = tryFindAmbientModule(moduleReference, /*withAugmentations*/ true);
             if (ambientModule) {
                 return ambientModule;
             }
             var currentSourceFile = ts.getSourceFileOfNode(location);
-            var resolvedModule = ts.getResolvedModule(currentSourceFile, moduleReference);
+            var resolvedModule = ts.getResolvedModule(currentSourceFile, moduleReference); // TODO: GH#18217
             var resolutionDiagnostic = resolvedModule && ts.getResolutionDiagnostic(compilerOptions, resolvedModule);
             var sourceFile = resolvedModule && !resolutionDiagnostic && host.getSourceFile(resolvedModule.resolvedFileName);
             if (sourceFile) {
                 if (sourceFile.symbol) {
                     if (resolvedModule.isExternalLibraryImport && !ts.extensionIsTypeScript(resolvedModule.extension)) {
-                        errorOnImplicitAnyModule(false, errorNode, resolvedModule, moduleReference);
+                        errorOnImplicitAnyModule(/*isError*/ false, errorNode, resolvedModule, moduleReference);
                     }
+                    // merged symbol is module declaration symbol combined with all augmentations
                     return getMergedSymbol(sourceFile.symbol);
                 }
                 if (moduleNotFoundError) {
+                    // report errors only if it was requested
                     error(errorNode, ts.Diagnostics.File_0_is_not_a_module, sourceFile.fileName);
                 }
                 return undefined;
@@ -24610,23 +31038,26 @@ var ts;
                     return getMergedSymbol(pattern.symbol);
                 }
             }
+            // May be an untyped module. If so, ignore resolutionDiagnostic.
             if (resolvedModule && !ts.resolutionExtensionIsTypeScriptOrJson(resolvedModule.extension) && resolutionDiagnostic === undefined || resolutionDiagnostic === ts.Diagnostics.Could_not_find_a_declaration_file_for_module_0_1_implicitly_has_an_any_type) {
                 if (isForAugmentation) {
                     var diag = ts.Diagnostics.Invalid_module_name_in_augmentation_Module_0_resolves_to_an_untyped_module_at_1_which_cannot_be_augmented;
                     error(errorNode, diag, moduleReference, resolvedModule.resolvedFileName);
                 }
                 else {
-                    errorOnImplicitAnyModule(noImplicitAny && !!moduleNotFoundError, errorNode, resolvedModule, moduleReference);
+                    errorOnImplicitAnyModule(/*isError*/ noImplicitAny && !!moduleNotFoundError, errorNode, resolvedModule, moduleReference);
                 }
+                // Failed imports and untyped modules are both treated in an untyped manner; only difference is whether we give a diagnostic first.
                 return undefined;
             }
             if (moduleNotFoundError) {
+                // For relative paths, see if this was possibly a projectReference redirect
                 if (ts.pathIsRelative(moduleReference)) {
                     var sourceFile_1 = ts.getSourceFileOfNode(location);
                     var redirects = sourceFile_1.redirectedReferences;
                     if (redirects) {
                         var normalizedTargetPath = ts.getNormalizedAbsolutePath(moduleReference, ts.getDirectoryPath(sourceFile_1.fileName));
-                        for (var _i = 0, _a = [".ts", ".tsx"]; _i < _a.length; _i++) {
+                        for (var _i = 0, _a = [".ts" /* Ts */, ".tsx" /* Tsx */]; _i < _a.length; _i++) {
                             var ext = _a[_i];
                             var probePath = normalizedTargetPath + ext;
                             if (redirects.indexOf(probePath) >= 0) {
@@ -24654,11 +31085,12 @@ var ts;
         }
         function errorOnImplicitAnyModule(isError, errorNode, _a, moduleReference) {
             var packageId = _a.packageId, resolvedFileName = _a.resolvedFileName;
-            var errorInfo = packageId && ts.chainDiagnosticMessages(undefined, ts.Diagnostics.Try_npm_install_types_Slash_0_if_it_exists_or_add_a_new_declaration_d_ts_file_containing_declare_module_0, ts.getMangledNameForScopedPackage(packageId.name));
+            var errorInfo = packageId && ts.chainDiagnosticMessages(
+            /*details*/ undefined, ts.Diagnostics.Try_npm_install_types_Slash_0_if_it_exists_or_add_a_new_declaration_d_ts_file_containing_declare_module_0, ts.getMangledNameForScopedPackage(packageId.name));
             errorOrSuggestion(isError, errorNode, ts.chainDiagnosticMessages(errorInfo, ts.Diagnostics.Could_not_find_a_declaration_file_for_module_0_1_implicitly_has_an_any_type, moduleReference, resolvedFileName));
         }
         function resolveExternalModuleSymbol(moduleSymbol, dontResolveAlias) {
-            return moduleSymbol && getMergedSymbol(getCommonJsExportEquals(resolveSymbol(moduleSymbol.exports.get("export="), dontResolveAlias), moduleSymbol)) || moduleSymbol;
+            return moduleSymbol && getMergedSymbol(getCommonJsExportEquals(resolveSymbol(moduleSymbol.exports.get("export=" /* ExportEquals */), dontResolveAlias), moduleSymbol)) || moduleSymbol;
         }
         function getCommonJsExportEquals(exported, moduleSymbol) {
             if (!exported || moduleSymbol.exports.size === 1) {
@@ -24666,20 +31098,23 @@ var ts;
             }
             var merged = cloneSymbol(exported);
             if (merged.exports === undefined) {
-                merged.flags = merged.flags | 512;
+                merged.flags = merged.flags | 512 /* ValueModule */;
                 merged.exports = ts.createSymbolTable();
             }
             moduleSymbol.exports.forEach(function (s, name) {
-                if (name === "export=")
+                if (name === "export=" /* ExportEquals */)
                     return;
                 merged.exports.set(name, merged.exports.has(name) ? mergeSymbol(merged.exports.get(name), s) : s);
             });
             return merged;
         }
+        // An external module with an 'export =' declaration may be referenced as an ES6 module provided the 'export ='
+        // references a symbol that is at least declared as a module or a variable. The target of the 'export =' may
+        // combine other declarations with the module or variable (e.g. a class/module, function/module, interface/variable).
         function resolveESModuleSymbol(moduleSymbol, referencingLocation, dontResolveAlias) {
             var symbol = resolveExternalModuleSymbol(moduleSymbol, dontResolveAlias);
             if (!dontResolveAlias && symbol) {
-                if (!(symbol.flags & (1536 | 3))) {
+                if (!(symbol.flags & (1536 /* Module */ | 3 /* Variable */))) {
                     error(referencingLocation, ts.Diagnostics.Module_0_resolves_to_a_non_module_entity_and_cannot_be_imported_using_this_construct, symbolToString(moduleSymbol));
                     return symbol;
                 }
@@ -24688,12 +31123,13 @@ var ts;
                     if ((ts.isImportDeclaration(referenceParent) && ts.getNamespaceDeclarationNode(referenceParent)) ||
                         ts.isImportCall(referenceParent)) {
                         var type = getTypeOfSymbol(symbol);
-                        var sigs = getSignaturesOfStructuredType(type, 0);
+                        var sigs = getSignaturesOfStructuredType(type, 0 /* Call */);
                         if (!sigs || !sigs.length) {
-                            sigs = getSignaturesOfStructuredType(type, 1);
+                            sigs = getSignaturesOfStructuredType(type, 1 /* Construct */);
                         }
                         if (sigs && sigs.length) {
                             var moduleType = getTypeWithSyntheticDefaultImportType(type, symbol, moduleSymbol);
+                            // Create a new symbol which has the module's type less the call and construct signatures
                             var result = createSymbol(symbol.flags, symbol.escapedName);
                             result.declarations = symbol.declarations ? symbol.declarations.slice() : [];
                             result.parent = symbol.parent;
@@ -24707,7 +31143,7 @@ var ts;
                                 result.members = ts.cloneMap(symbol.members);
                             if (symbol.exports)
                                 result.exports = ts.cloneMap(symbol.exports);
-                            var resolvedModuleType = resolveStructuredTypeMembers(moduleType);
+                            var resolvedModuleType = resolveStructuredTypeMembers(moduleType); // Should already be resolved from the signature checks above
                             result.type = createAnonymousType(result, resolvedModuleType.members, ts.emptyArray, ts.emptyArray, resolvedModuleType.stringIndexInfo, resolvedModuleType.numberIndexInfo);
                             return result;
                         }
@@ -24717,7 +31153,7 @@ var ts;
             return symbol;
         }
         function hasExportAssignmentSymbol(moduleSymbol) {
-            return moduleSymbol.exports.get("export=") !== undefined;
+            return moduleSymbol.exports.get("export=" /* ExportEquals */) !== undefined;
         }
         function getExportsOfModuleAsArray(moduleSymbol) {
             return symbolsToArray(getExportsOfModule(moduleSymbol));
@@ -24746,22 +31182,26 @@ var ts;
                 return undefined;
             }
             var type = getTypeOfSymbol(exportEquals);
-            return type.flags & 32764 ? undefined : getPropertyOfType(type, memberName);
+            return type.flags & 32764 /* Primitive */ ? undefined : getPropertyOfType(type, memberName);
         }
         function getExportsOfSymbol(symbol) {
-            return symbol.flags & 32 ? getResolvedMembersOrExportsOfSymbol(symbol, "resolvedExports") :
-                symbol.flags & 1536 ? getExportsOfModule(symbol) :
+            return symbol.flags & 32 /* Class */ ? getResolvedMembersOrExportsOfSymbol(symbol, "resolvedExports" /* resolvedExports */) :
+                symbol.flags & 1536 /* Module */ ? getExportsOfModule(symbol) :
                     symbol.exports || emptySymbols;
         }
         function getExportsOfModule(moduleSymbol) {
             var links = getSymbolLinks(moduleSymbol);
             return links.resolvedExports || (links.resolvedExports = getExportsOfModuleWorker(moduleSymbol));
         }
+        /**
+         * Extends one symbol table with another while collecting information on name collisions for error message generation into the `lookupTable` argument
+         * Not passing `lookupTable` and `exportNode` disables this collection, and just extends the tables
+         */
         function extendExportSymbols(target, source, lookupTable, exportNode) {
             if (!source)
                 return;
             source.forEach(function (sourceSymbol, id) {
-                if (id === "default")
+                if (id === "default" /* Default */)
                     return;
                 var targetSymbol = target.get(id);
                 if (!targetSymbol) {
@@ -24785,14 +31225,18 @@ var ts;
         }
         function getExportsOfModuleWorker(moduleSymbol) {
             var visitedSymbols = [];
+            // A module defined by an 'export=' consists on one export that needs to be resolved
             moduleSymbol = resolveExternalModuleSymbol(moduleSymbol);
             return visit(moduleSymbol) || emptySymbols;
+            // The ES6 spec permits export * declarations in a module to circularly reference the module itself. For example,
+            // module 'a' can 'export * from "b"' and 'b' can 'export * from "a"' without error.
             function visit(symbol) {
-                if (!(symbol && symbol.flags & 1952 && ts.pushIfUnique(visitedSymbols, symbol))) {
+                if (!(symbol && symbol.flags & 1952 /* HasExports */ && ts.pushIfUnique(visitedSymbols, symbol))) {
                     return;
                 }
                 var symbols = ts.cloneMap(symbol.exports);
-                var exportStars = symbol.exports.get("__export");
+                // All export * declarations are collected in an __export symbol by the binder
+                var exportStars = symbol.exports.get("__export" /* ExportStar */);
                 if (exportStars) {
                     var nestedSymbols = ts.createSymbolTable();
                     var lookupTable_1 = ts.createMap();
@@ -24804,6 +31248,7 @@ var ts;
                     }
                     lookupTable_1.forEach(function (_a, id) {
                         var exportsWithDuplicate = _a.exportsWithDuplicate;
+                        // It's not an error if the file with multiple `export *`s with duplicate names exports a member with that name itself
                         if (id === "export=" || !(exportsWithDuplicate && exportsWithDuplicate.length) || symbols.has(id)) {
                             return;
                         }
@@ -24827,6 +31272,10 @@ var ts;
         function getParentOfSymbol(symbol) {
             return getMergedSymbol(symbol.parent && getLateBoundSymbol(symbol.parent));
         }
+        /**
+         * Attempts to find the symbol corresponding to the container a symbol is in - usually this
+         * is just its' `.parent`, but for locals, this value is `undefined`
+         */
         function getContainerOfSymbol(symbol) {
             var container = getParentOfSymbol(symbol);
             if (container) {
@@ -24841,6 +31290,7 @@ var ts;
         }
         function getAliasForSymbolInContainer(container, symbol) {
             if (container === getParentOfSymbol(symbol)) {
+                // fast path, `symbol` is either already the alias or isn't aliased
                 return symbol;
             }
             var exports = getExportsOfSymbol(container);
@@ -24860,18 +31310,18 @@ var ts;
             }
         }
         function getExportSymbolOfValueSymbolIfExported(symbol) {
-            return symbol && (symbol.flags & 1048576) !== 0
+            return symbol && (symbol.flags & 1048576 /* ExportValue */) !== 0
                 ? getMergedSymbol(symbol.exportSymbol)
                 : symbol;
         }
         function symbolIsValue(symbol) {
-            return !!(symbol.flags & 67216319 || symbol.flags & 2097152 && resolveAlias(symbol).flags & 67216319);
+            return !!(symbol.flags & 67216319 /* Value */ || symbol.flags & 2097152 /* Alias */ && resolveAlias(symbol).flags & 67216319 /* Value */);
         }
         function findConstructorDeclaration(node) {
             var members = node.members;
-            for (var _i = 0, members_2 = members; _i < members_2.length; _i++) {
-                var member = members_2[_i];
-                if (member.kind === 155 && ts.nodeIsPresent(member.body)) {
+            for (var _i = 0, members_1 = members; _i < members_1.length; _i++) {
+                var member = members_1[_i];
+                if (member.kind === 155 /* Constructor */ && ts.nodeIsPresent(member.body)) {
                     return member;
                 }
             }
@@ -24889,12 +31339,12 @@ var ts;
         }
         function createBooleanType(trueFalseTypes) {
             var type = getUnionType(trueFalseTypes);
-            type.flags |= 16;
+            type.flags |= 16 /* Boolean */;
             type.intrinsicName = "boolean";
             return type;
         }
         function createObjectType(objectFlags, symbol) {
-            var type = createType(131072);
+            var type = createType(131072 /* Object */);
             type.objectFlags = objectFlags;
             type.symbol = symbol;
             return type;
@@ -24902,11 +31352,15 @@ var ts;
         function createTypeofType() {
             return getUnionType(ts.arrayFrom(typeofEQFacts.keys(), getLiteralType));
         }
+        // A reserved member name starts with two underscores, but the third character cannot be an underscore
+        // or the @ symbol. A third underscore indicates an escaped form of an identifer that started
+        // with at least two underscores. The @ character indicates that the name is denoted by a well known ES
+        // Symbol instance.
         function isReservedMemberName(name) {
-            return name.charCodeAt(0) === 95 &&
-                name.charCodeAt(1) === 95 &&
-                name.charCodeAt(2) !== 95 &&
-                name.charCodeAt(2) !== 64;
+            return name.charCodeAt(0) === 95 /* _ */ &&
+                name.charCodeAt(1) === 95 /* _ */ &&
+                name.charCodeAt(2) !== 95 /* _ */ &&
+                name.charCodeAt(2) !== 64 /* at */;
         }
         function getNamedMembers(members) {
             var result;
@@ -24933,22 +31387,24 @@ var ts;
             return type;
         }
         function createAnonymousType(symbol, members, callSignatures, constructSignatures, stringIndexInfo, numberIndexInfo) {
-            return setStructuredTypeMembers(createObjectType(16, symbol), members, callSignatures, constructSignatures, stringIndexInfo, numberIndexInfo);
+            return setStructuredTypeMembers(createObjectType(16 /* Anonymous */, symbol), members, callSignatures, constructSignatures, stringIndexInfo, numberIndexInfo);
         }
         function forEachSymbolTableInScope(enclosingDeclaration, callback) {
             var result;
             for (var location = enclosingDeclaration; location; location = location.parent) {
+                // Locals of a source file are not in scope (because they get merged into the global symbol table)
                 if (location.locals && !isGlobalSourceFile(location)) {
                     if (result = callback(location.locals)) {
                         return result;
                     }
                 }
                 switch (location.kind) {
-                    case 274:
+                    case 274 /* SourceFile */:
                         if (!ts.isExternalOrCommonJsModule(location)) {
                             break;
                         }
-                    case 239:
+                    // falls through
+                    case 239 /* ModuleDeclaration */:
                         if (result = callback(getSymbolOfNode(location).exports)) {
                             return result;
                         }
@@ -24958,7 +31414,8 @@ var ts;
             return callback(globals);
         }
         function getQualifiedLeftMeaning(rightMeaning) {
-            return rightMeaning === 67216319 ? 67216319 : 1920;
+            // If we are looking in value space, the parent meaning is value, other wise it is namespace
+            return rightMeaning === 67216319 /* Value */ ? 67216319 /* Value */ : 1920 /* Namespace */;
         }
         function getAccessibleSymbolChain(symbol, enclosingDeclaration, meaning, useOnlyExternalAliasing, visitedSymbolTablesMap) {
             if (visitedSymbolTablesMap === void 0) { visitedSymbolTablesMap = ts.createMap(); }
@@ -24971,6 +31428,9 @@ var ts;
                 visitedSymbolTablesMap.set(id, visitedSymbolTables = []);
             }
             return forEachSymbolTableInScope(enclosingDeclaration, getAccessibleSymbolChainFromSymbolTable);
+            /**
+             * @param {ignoreQualification} boolean Set when a symbol is being looked for through the exports of another symbol (meaning we have a route to qualify it already)
+             */
             function getAccessibleSymbolChainFromSymbolTable(symbols, ignoreQualification) {
                 if (!ts.pushIfUnique(visitedSymbolTables, symbols)) {
                     return undefined;
@@ -24980,36 +31440,46 @@ var ts;
                 return result;
             }
             function canQualifySymbol(symbolFromSymbolTable, meaning) {
+                // If the symbol is equivalent and doesn't need further qualification, this symbol is accessible
                 return !needsQualification(symbolFromSymbolTable, enclosingDeclaration, meaning) ||
+                    // If symbol needs qualification, make sure that parent is accessible, if it is then this symbol is accessible too
                     !!getAccessibleSymbolChain(symbolFromSymbolTable.parent, enclosingDeclaration, getQualifiedLeftMeaning(meaning), useOnlyExternalAliasing, visitedSymbolTablesMap);
             }
             function isAccessible(symbolFromSymbolTable, resolvedAliasSymbol, ignoreQualification) {
                 return symbol === (resolvedAliasSymbol || symbolFromSymbolTable) &&
+                    // if the symbolFromSymbolTable is not external module (it could be if it was determined as ambient external module and would be in globals table)
+                    // and if symbolFromSymbolTable or alias resolution matches the symbol,
+                    // check the symbol can be qualified, it is only then this symbol is accessible
                     !ts.some(symbolFromSymbolTable.declarations, hasNonGlobalAugmentationExternalModuleSymbol) &&
                     (ignoreQualification || canQualifySymbol(symbolFromSymbolTable, meaning));
             }
             function trySymbolTable(symbols, ignoreQualification) {
-                if (isAccessible(symbols.get(symbol.escapedName), undefined, ignoreQualification)) {
+                // If symbol is directly available by its name in the symbol table
+                if (isAccessible(symbols.get(symbol.escapedName), /*resolvedAliasSymbol*/ undefined, ignoreQualification)) {
                     return [symbol];
                 }
+                // Check if symbol is any of the alias
                 return ts.forEachEntry(symbols, function (symbolFromSymbolTable) {
-                    if (symbolFromSymbolTable.flags & 2097152
-                        && symbolFromSymbolTable.escapedName !== "export="
-                        && symbolFromSymbolTable.escapedName !== "default"
+                    if (symbolFromSymbolTable.flags & 2097152 /* Alias */
+                        && symbolFromSymbolTable.escapedName !== "export=" /* ExportEquals */
+                        && symbolFromSymbolTable.escapedName !== "default" /* Default */
                         && !(ts.isUMDExportSymbol(symbolFromSymbolTable) && enclosingDeclaration && ts.isExternalModule(ts.getSourceFileOfNode(enclosingDeclaration)))
+                        // If `!useOnlyExternalAliasing`, we can use any type of alias to get the name
                         && (!useOnlyExternalAliasing || ts.some(symbolFromSymbolTable.declarations, ts.isExternalModuleImportEqualsDeclaration))) {
                         var resolvedImportedSymbol = resolveAlias(symbolFromSymbolTable);
                         if (isAccessible(symbolFromSymbolTable, resolvedImportedSymbol, ignoreQualification)) {
                             return [symbolFromSymbolTable];
                         }
+                        // Look in the exported members, if we can find accessibleSymbolChain, symbol is accessible using this chain
+                        // but only if the symbolFromSymbolTable can be qualified
                         var candidateTable = getExportsOfSymbol(resolvedImportedSymbol);
-                        var accessibleSymbolsFromExports = candidateTable && getAccessibleSymbolChainFromSymbolTable(candidateTable, true);
+                        var accessibleSymbolsFromExports = candidateTable && getAccessibleSymbolChainFromSymbolTable(candidateTable, /*ignoreQualification*/ true);
                         if (accessibleSymbolsFromExports && canQualifySymbol(symbolFromSymbolTable, getQualifiedLeftMeaning(meaning))) {
                             return [symbolFromSymbolTable].concat(accessibleSymbolsFromExports);
                         }
                     }
                     if (symbolFromSymbolTable.escapedName === symbol.escapedName && symbolFromSymbolTable.exportSymbol) {
-                        if (isAccessible(getMergedSymbol(symbolFromSymbolTable.exportSymbol), undefined, ignoreQualification)) {
+                        if (isAccessible(getMergedSymbol(symbolFromSymbolTable.exportSymbol), /*aliasSymbol*/ undefined, ignoreQualification)) {
                             return [symbol];
                         }
                     }
@@ -25019,18 +31489,24 @@ var ts;
         function needsQualification(symbol, enclosingDeclaration, meaning) {
             var qualify = false;
             forEachSymbolTableInScope(enclosingDeclaration, function (symbolTable) {
+                // If symbol of this name is not available in the symbol table we are ok
                 var symbolFromSymbolTable = getMergedSymbol(symbolTable.get(symbol.escapedName));
                 if (!symbolFromSymbolTable) {
+                    // Continue to the next symbol table
                     return false;
                 }
+                // If the symbol with this name is present it should refer to the symbol
                 if (symbolFromSymbolTable === symbol) {
+                    // No need to qualify
                     return true;
                 }
-                symbolFromSymbolTable = (symbolFromSymbolTable.flags & 2097152 && !ts.getDeclarationOfKind(symbolFromSymbolTable, 252)) ? resolveAlias(symbolFromSymbolTable) : symbolFromSymbolTable;
+                // Qualify if the symbol from symbol table has same meaning as expected
+                symbolFromSymbolTable = (symbolFromSymbolTable.flags & 2097152 /* Alias */ && !ts.getDeclarationOfKind(symbolFromSymbolTable, 252 /* ExportSpecifier */)) ? resolveAlias(symbolFromSymbolTable) : symbolFromSymbolTable;
                 if (symbolFromSymbolTable.flags & meaning) {
                     qualify = true;
                     return true;
                 }
+                // Continue to the next symbol table
                 return false;
             });
             return qualify;
@@ -25040,10 +31516,10 @@ var ts;
                 for (var _i = 0, _a = symbol.declarations; _i < _a.length; _i++) {
                     var declaration = _a[_i];
                     switch (declaration.kind) {
-                        case 152:
-                        case 154:
-                        case 156:
-                        case 157:
+                        case 152 /* PropertyDeclaration */:
+                        case 154 /* MethodDeclaration */:
+                        case 156 /* GetAccessor */:
+                        case 157 /* SetAccessor */:
                             continue;
                         default:
                             return false;
@@ -25054,97 +31530,129 @@ var ts;
             return false;
         }
         function isTypeSymbolAccessible(typeSymbol, enclosingDeclaration) {
-            var access = isSymbolAccessible(typeSymbol, enclosingDeclaration, 67901928, false);
-            return access.accessibility === 0;
+            var access = isSymbolAccessible(typeSymbol, enclosingDeclaration, 67901928 /* Type */, /*shouldComputeAliasesToMakeVisible*/ false);
+            return access.accessibility === 0 /* Accessible */;
         }
         function isValueSymbolAccessible(typeSymbol, enclosingDeclaration) {
-            var access = isSymbolAccessible(typeSymbol, enclosingDeclaration, 67216319, false);
-            return access.accessibility === 0;
+            var access = isSymbolAccessible(typeSymbol, enclosingDeclaration, 67216319 /* Value */, /*shouldComputeAliasesToMakeVisible*/ false);
+            return access.accessibility === 0 /* Accessible */;
         }
+        /**
+         * Check if the given symbol in given enclosing declaration is accessible and mark all associated alias to be visible if requested
+         *
+         * @param symbol a Symbol to check if accessible
+         * @param enclosingDeclaration a Node containing reference to the symbol
+         * @param meaning a SymbolFlags to check if such meaning of the symbol is accessible
+         * @param shouldComputeAliasToMakeVisible a boolean value to indicate whether to return aliases to be mark visible in case the symbol is accessible
+         */
         function isSymbolAccessible(symbol, enclosingDeclaration, meaning, shouldComputeAliasesToMakeVisible) {
             if (symbol && enclosingDeclaration) {
                 var initialSymbol = symbol;
                 var meaningToLook = meaning;
                 while (symbol) {
-                    var accessibleSymbolChain = getAccessibleSymbolChain(symbol, enclosingDeclaration, meaningToLook, false);
+                    // Symbol is accessible if it by itself is accessible
+                    var accessibleSymbolChain = getAccessibleSymbolChain(symbol, enclosingDeclaration, meaningToLook, /*useOnlyExternalAliasing*/ false);
                     if (accessibleSymbolChain) {
                         var hasAccessibleDeclarations = hasVisibleDeclarations(accessibleSymbolChain[0], shouldComputeAliasesToMakeVisible);
                         if (!hasAccessibleDeclarations) {
                             return {
-                                accessibility: 1,
+                                accessibility: 1 /* NotAccessible */,
                                 errorSymbolName: symbolToString(initialSymbol, enclosingDeclaration, meaning),
-                                errorModuleName: symbol !== initialSymbol ? symbolToString(symbol, enclosingDeclaration, 1920) : undefined,
+                                errorModuleName: symbol !== initialSymbol ? symbolToString(symbol, enclosingDeclaration, 1920 /* Namespace */) : undefined,
                             };
                         }
                         return hasAccessibleDeclarations;
                     }
                     else {
                         if (ts.some(symbol.declarations, hasNonGlobalAugmentationExternalModuleSymbol)) {
+                            // Any meaning of a module symbol is always accessible via an `import` type
                             return {
-                                accessibility: 0
+                                accessibility: 0 /* Accessible */
                             };
                         }
                     }
+                    // If we haven't got the accessible symbol, it doesn't mean the symbol is actually inaccessible.
+                    // It could be a qualified symbol and hence verify the path
+                    // e.g.:
+                    // module m {
+                    //     export class c {
+                    //     }
+                    // }
+                    // const x: typeof m.c
+                    // In the above example when we start with checking if typeof m.c symbol is accessible,
+                    // we are going to see if c can be accessed in scope directly.
+                    // But it can't, hence the accessible is going to be undefined, but that doesn't mean m.c is inaccessible
+                    // It is accessible if the parent m is accessible because then m.c can be accessed through qualification
                     meaningToLook = getQualifiedLeftMeaning(meaning);
                     symbol = getContainerOfSymbol(symbol);
                 }
+                // This could be a symbol that is not exported in the external module
+                // or it could be a symbol from different external module that is not aliased and hence cannot be named
                 var symbolExternalModule = ts.forEach(initialSymbol.declarations, getExternalModuleContainer);
                 if (symbolExternalModule) {
                     var enclosingExternalModule = getExternalModuleContainer(enclosingDeclaration);
                     if (symbolExternalModule !== enclosingExternalModule) {
+                        // name from different external module that is not visible
                         return {
-                            accessibility: 2,
+                            accessibility: 2 /* CannotBeNamed */,
                             errorSymbolName: symbolToString(initialSymbol, enclosingDeclaration, meaning),
                             errorModuleName: symbolToString(symbolExternalModule)
                         };
                     }
                 }
+                // Just a local name that is not accessible
                 return {
-                    accessibility: 1,
+                    accessibility: 1 /* NotAccessible */,
                     errorSymbolName: symbolToString(initialSymbol, enclosingDeclaration, meaning),
                 };
             }
-            return { accessibility: 0 };
+            return { accessibility: 0 /* Accessible */ };
             function getExternalModuleContainer(declaration) {
                 var node = ts.findAncestor(declaration, hasExternalModuleSymbol);
                 return node && getSymbolOfNode(node);
             }
         }
         function hasExternalModuleSymbol(declaration) {
-            return ts.isAmbientModule(declaration) || (declaration.kind === 274 && ts.isExternalOrCommonJsModule(declaration));
+            return ts.isAmbientModule(declaration) || (declaration.kind === 274 /* SourceFile */ && ts.isExternalOrCommonJsModule(declaration));
         }
         function hasNonGlobalAugmentationExternalModuleSymbol(declaration) {
-            return ts.isModuleWithStringLiteralName(declaration) || (declaration.kind === 274 && ts.isExternalOrCommonJsModule(declaration));
+            return ts.isModuleWithStringLiteralName(declaration) || (declaration.kind === 274 /* SourceFile */ && ts.isExternalOrCommonJsModule(declaration));
         }
         function hasVisibleDeclarations(symbol, shouldComputeAliasToMakeVisible) {
             var aliasesToMakeVisible;
-            if (ts.forEach(symbol.declarations, function (declaration) { return !getIsDeclarationVisible(declaration); })) {
+            if (!ts.every(symbol.declarations, getIsDeclarationVisible)) {
                 return undefined;
             }
-            return { accessibility: 0, aliasesToMakeVisible: aliasesToMakeVisible };
+            return { accessibility: 0 /* Accessible */, aliasesToMakeVisible: aliasesToMakeVisible };
             function getIsDeclarationVisible(declaration) {
                 if (!isDeclarationVisible(declaration)) {
+                    // Mark the unexported alias as visible if its parent is visible
+                    // because these kind of aliases can be used to name types in declaration file
                     var anyImportSyntax = getAnyImportSyntax(declaration);
                     if (anyImportSyntax &&
-                        !ts.hasModifier(anyImportSyntax, 1) &&
+                        !ts.hasModifier(anyImportSyntax, 1 /* Export */) && // import clause without export
                         isDeclarationVisible(anyImportSyntax.parent)) {
                         return addVisibleAlias(declaration, anyImportSyntax);
                     }
                     else if (ts.isVariableDeclaration(declaration) && ts.isVariableStatement(declaration.parent.parent) &&
-                        !ts.hasModifier(declaration.parent.parent, 1) &&
+                        !ts.hasModifier(declaration.parent.parent, 1 /* Export */) && // unexported variable statement
                         isDeclarationVisible(declaration.parent.parent.parent)) {
                         return addVisibleAlias(declaration, declaration.parent.parent);
                     }
-                    else if (ts.isLateVisibilityPaintedStatement(declaration)
-                        && !ts.hasModifier(declaration, 1)
+                    else if (ts.isLateVisibilityPaintedStatement(declaration) // unexported top-level statement
+                        && !ts.hasModifier(declaration, 1 /* Export */)
                         && isDeclarationVisible(declaration.parent)) {
                         return addVisibleAlias(declaration, declaration);
                     }
+                    // Declaration is not visible
                     return false;
                 }
                 return true;
             }
             function addVisibleAlias(declaration, aliasingStatement) {
+                // In function "buildTypeDisplay" where we decide whether to write type-alias or serialize types,
+                // we want to just check if type- alias is accessible or not but we don't care about emitting those alias at that time
+                // since we will do the emitting later in trackSymbol.
                 if (shouldComputeAliasToMakeVisible) {
                     getNodeLinks(declaration).isVisible = true;
                     aliasesToMakeVisible = ts.appendIfUnique(aliasesToMakeVisible, aliasingStatement);
@@ -25153,141 +31661,147 @@ var ts;
             }
         }
         function isEntityNameVisible(entityName, enclosingDeclaration) {
+            // get symbol of the first identifier of the entityName
             var meaning;
-            if (entityName.parent.kind === 165 ||
+            if (entityName.parent.kind === 165 /* TypeQuery */ ||
                 ts.isExpressionWithTypeArgumentsInClassExtendsClause(entityName.parent) ||
-                entityName.parent.kind === 147) {
-                meaning = 67216319 | 1048576;
+                entityName.parent.kind === 147 /* ComputedPropertyName */) {
+                // Typeof value
+                meaning = 67216319 /* Value */ | 1048576 /* ExportValue */;
             }
-            else if (entityName.kind === 146 || entityName.kind === 185 ||
-                entityName.parent.kind === 243) {
-                meaning = 1920;
+            else if (entityName.kind === 146 /* QualifiedName */ || entityName.kind === 185 /* PropertyAccessExpression */ ||
+                entityName.parent.kind === 243 /* ImportEqualsDeclaration */) {
+                // Left identifier from type reference or TypeAlias
+                // Entity name of the import declaration
+                meaning = 1920 /* Namespace */;
             }
             else {
-                meaning = 67901928;
+                // Type Reference or TypeAlias entity = Identifier
+                meaning = 67901928 /* Type */;
             }
             var firstIdentifier = getFirstIdentifier(entityName);
-            var symbol = resolveName(enclosingDeclaration, firstIdentifier.escapedText, meaning, undefined, undefined, false);
-            return (symbol && hasVisibleDeclarations(symbol, true)) || {
-                accessibility: 1,
+            var symbol = resolveName(enclosingDeclaration, firstIdentifier.escapedText, meaning, /*nodeNotFoundErrorMessage*/ undefined, /*nameArg*/ undefined, /*isUse*/ false);
+            // Verify if the symbol is accessible
+            return (symbol && hasVisibleDeclarations(symbol, /*shouldComputeAliasToMakeVisible*/ true)) || {
+                accessibility: 1 /* NotAccessible */,
                 errorSymbolName: ts.getTextOfNode(firstIdentifier),
                 errorNode: firstIdentifier
             };
         }
         function symbolToString(symbol, enclosingDeclaration, meaning, flags, writer) {
-            if (flags === void 0) { flags = 4; }
-            var nodeFlags = 3112960;
-            if (flags & 2) {
-                nodeFlags |= 128;
+            if (flags === void 0) { flags = 4 /* AllowAnyNodeKind */; }
+            var nodeFlags = 3112960 /* IgnoreErrors */;
+            if (flags & 2 /* UseOnlyExternalAliasing */) {
+                nodeFlags |= 128 /* UseOnlyExternalAliasing */;
             }
-            if (flags & 1) {
-                nodeFlags |= 512;
+            if (flags & 1 /* WriteTypeParametersOrArguments */) {
+                nodeFlags |= 512 /* WriteTypeParametersInQualifiedName */;
             }
-            if (flags & 8) {
-                nodeFlags |= 16384;
+            if (flags & 8 /* UseAliasDefinedOutsideCurrentScope */) {
+                nodeFlags |= 16384 /* UseAliasDefinedOutsideCurrentScope */;
             }
-            var builder = flags & 4 ? nodeBuilder.symbolToExpression : nodeBuilder.symbolToEntityName;
+            var builder = flags & 4 /* AllowAnyNodeKind */ ? nodeBuilder.symbolToExpression : nodeBuilder.symbolToEntityName;
             return writer ? symbolToStringWorker(writer).getText() : ts.usingSingleLineStringWriter(symbolToStringWorker);
             function symbolToStringWorker(writer) {
-                var entity = builder(symbol, meaning, enclosingDeclaration, nodeFlags);
+                var entity = builder(symbol, meaning, enclosingDeclaration, nodeFlags); // TODO: GH#18217
                 var printer = ts.createPrinter({ removeComments: true });
                 var sourceFile = enclosingDeclaration && ts.getSourceFileOfNode(enclosingDeclaration);
-                printer.writeNode(4, entity, sourceFile, writer);
+                printer.writeNode(4 /* Unspecified */, entity, /*sourceFile*/ sourceFile, writer);
                 return writer;
             }
         }
         function signatureToString(signature, enclosingDeclaration, flags, kind, writer) {
-            if (flags === void 0) { flags = 0; }
+            if (flags === void 0) { flags = 0 /* None */; }
             return writer ? signatureToStringWorker(writer).getText() : ts.usingSingleLineStringWriter(signatureToStringWorker);
             function signatureToStringWorker(writer) {
                 var sigOutput;
-                if (flags & 262144) {
-                    sigOutput = kind === 1 ? 164 : 163;
+                if (flags & 262144 /* WriteArrowStyleSignature */) {
+                    sigOutput = kind === 1 /* Construct */ ? 164 /* ConstructorType */ : 163 /* FunctionType */;
                 }
                 else {
-                    sigOutput = kind === 1 ? 159 : 158;
+                    sigOutput = kind === 1 /* Construct */ ? 159 /* ConstructSignature */ : 158 /* CallSignature */;
                 }
-                var sig = nodeBuilder.signatureToSignatureDeclaration(signature, sigOutput, enclosingDeclaration, toNodeBuilderFlags(flags) | 3112960 | 512);
+                var sig = nodeBuilder.signatureToSignatureDeclaration(signature, sigOutput, enclosingDeclaration, toNodeBuilderFlags(flags) | 3112960 /* IgnoreErrors */ | 512 /* WriteTypeParametersInQualifiedName */);
                 var printer = ts.createPrinter({ removeComments: true, omitTrailingSemicolon: true });
                 var sourceFile = enclosingDeclaration && ts.getSourceFileOfNode(enclosingDeclaration);
-                printer.writeNode(4, sig, sourceFile, writer);
+                printer.writeNode(4 /* Unspecified */, sig, /*sourceFile*/ sourceFile, writer); // TODO: GH#18217
                 return writer;
             }
         }
         function typeToString(type, enclosingDeclaration, flags, writer) {
-            if (flags === void 0) { flags = 1048576 | 16384; }
+            if (flags === void 0) { flags = 1048576 /* AllowUniqueESSymbolType */ | 16384 /* UseAliasDefinedOutsideCurrentScope */; }
             if (writer === void 0) { writer = ts.createTextWriter(""); }
-            var typeNode = nodeBuilder.typeToTypeNode(type, enclosingDeclaration, toNodeBuilderFlags(flags) | 3112960, writer);
+            var typeNode = nodeBuilder.typeToTypeNode(type, enclosingDeclaration, toNodeBuilderFlags(flags) | 3112960 /* IgnoreErrors */, writer);
             if (typeNode === undefined)
                 return ts.Debug.fail("should always get typenode");
             var options = { removeComments: true };
             var printer = ts.createPrinter(options);
             var sourceFile = enclosingDeclaration && ts.getSourceFileOfNode(enclosingDeclaration);
-            printer.writeNode(4, typeNode, sourceFile, writer);
+            printer.writeNode(4 /* Unspecified */, typeNode, /*sourceFile*/ sourceFile, writer);
             var result = writer.getText();
-            var maxLength = compilerOptions.noErrorTruncation || flags & 1 ? undefined : 100;
+            var maxLength = compilerOptions.noErrorTruncation || flags & 1 /* NoTruncation */ ? undefined : 100;
             if (maxLength && result && result.length >= maxLength) {
                 return result.substr(0, maxLength - "...".length) + "...";
             }
             return result;
         }
         function toNodeBuilderFlags(flags) {
-            if (flags === void 0) { flags = 0; }
-            return flags & 9469291;
+            if (flags === void 0) { flags = 0 /* None */; }
+            return flags & 9469291 /* NodeBuilderFlagsMask */;
         }
         function createNodeBuilder() {
             return {
                 typeToTypeNode: function (type, enclosingDeclaration, flags, tracker) {
-                    ts.Debug.assert(enclosingDeclaration === undefined || (enclosingDeclaration.flags & 8) === 0);
+                    ts.Debug.assert(enclosingDeclaration === undefined || (enclosingDeclaration.flags & 8 /* Synthesized */) === 0);
                     var context = createNodeBuilderContext(enclosingDeclaration, flags, tracker);
                     var resultingNode = typeToTypeNodeHelper(type, context);
                     var result = context.encounteredError ? undefined : resultingNode;
                     return result;
                 },
                 indexInfoToIndexSignatureDeclaration: function (indexInfo, kind, enclosingDeclaration, flags, tracker) {
-                    ts.Debug.assert(enclosingDeclaration === undefined || (enclosingDeclaration.flags & 8) === 0);
+                    ts.Debug.assert(enclosingDeclaration === undefined || (enclosingDeclaration.flags & 8 /* Synthesized */) === 0);
                     var context = createNodeBuilderContext(enclosingDeclaration, flags, tracker);
                     var resultingNode = indexInfoToIndexSignatureDeclarationHelper(indexInfo, kind, context);
                     var result = context.encounteredError ? undefined : resultingNode;
-                    return result;
+                    return result; // TODO: GH#18217
                 },
                 signatureToSignatureDeclaration: function (signature, kind, enclosingDeclaration, flags, tracker) {
-                    ts.Debug.assert(enclosingDeclaration === undefined || (enclosingDeclaration.flags & 8) === 0);
+                    ts.Debug.assert(enclosingDeclaration === undefined || (enclosingDeclaration.flags & 8 /* Synthesized */) === 0);
                     var context = createNodeBuilderContext(enclosingDeclaration, flags, tracker);
                     var resultingNode = signatureToSignatureDeclarationHelper(signature, kind, context);
                     var result = context.encounteredError ? undefined : resultingNode;
                     return result;
                 },
                 symbolToEntityName: function (symbol, meaning, enclosingDeclaration, flags, tracker) {
-                    ts.Debug.assert(enclosingDeclaration === undefined || (enclosingDeclaration.flags & 8) === 0);
+                    ts.Debug.assert(enclosingDeclaration === undefined || (enclosingDeclaration.flags & 8 /* Synthesized */) === 0);
                     var context = createNodeBuilderContext(enclosingDeclaration, flags, tracker);
-                    var resultingNode = symbolToName(symbol, context, meaning, false);
+                    var resultingNode = symbolToName(symbol, context, meaning, /*expectsIdentifier*/ false);
                     var result = context.encounteredError ? undefined : resultingNode;
                     return result;
                 },
                 symbolToExpression: function (symbol, meaning, enclosingDeclaration, flags, tracker) {
-                    ts.Debug.assert(enclosingDeclaration === undefined || (enclosingDeclaration.flags & 8) === 0);
+                    ts.Debug.assert(enclosingDeclaration === undefined || (enclosingDeclaration.flags & 8 /* Synthesized */) === 0);
                     var context = createNodeBuilderContext(enclosingDeclaration, flags, tracker);
                     var resultingNode = symbolToExpression(symbol, context, meaning);
                     var result = context.encounteredError ? undefined : resultingNode;
                     return result;
                 },
                 symbolToTypeParameterDeclarations: function (symbol, enclosingDeclaration, flags, tracker) {
-                    ts.Debug.assert(enclosingDeclaration === undefined || (enclosingDeclaration.flags & 8) === 0);
+                    ts.Debug.assert(enclosingDeclaration === undefined || (enclosingDeclaration.flags & 8 /* Synthesized */) === 0);
                     var context = createNodeBuilderContext(enclosingDeclaration, flags, tracker);
                     var resultingNode = typeParametersToTypeParameterDeclarations(symbol, context);
                     var result = context.encounteredError ? undefined : resultingNode;
                     return result;
                 },
                 symbolToParameterDeclaration: function (symbol, enclosingDeclaration, flags, tracker) {
-                    ts.Debug.assert(enclosingDeclaration === undefined || (enclosingDeclaration.flags & 8) === 0);
+                    ts.Debug.assert(enclosingDeclaration === undefined || (enclosingDeclaration.flags & 8 /* Synthesized */) === 0);
                     var context = createNodeBuilderContext(enclosingDeclaration, flags, tracker);
                     var resultingNode = symbolToParameterDeclaration(symbol, context);
                     var result = context.encounteredError ? undefined : resultingNode;
                     return result;
                 },
                 typeParameterToDeclaration: function (parameter, enclosingDeclaration, flags, tracker) {
-                    ts.Debug.assert(enclosingDeclaration === undefined || (enclosingDeclaration.flags & 8) === 0);
+                    ts.Debug.assert(enclosingDeclaration === undefined || (enclosingDeclaration.flags & 8 /* Synthesized */) === 0);
                     var context = createNodeBuilderContext(enclosingDeclaration, flags, tracker);
                     var resultingNode = typeParameterToDeclaration(parameter, context);
                     var result = context.encounteredError ? undefined : resultingNode;
@@ -25297,7 +31811,7 @@ var ts;
             function createNodeBuilderContext(enclosingDeclaration, flags, tracker) {
                 return {
                     enclosingDeclaration: enclosingDeclaration,
-                    flags: flags || 0,
+                    flags: flags || 0 /* None */,
                     tracker: tracker && tracker.trackSymbol ? tracker : { trackSymbol: ts.noop },
                     encounteredError: false,
                     visitedSymbols: undefined,
@@ -25308,78 +31822,78 @@ var ts;
                 if (cancellationToken && cancellationToken.throwIfCancellationRequested) {
                     cancellationToken.throwIfCancellationRequested();
                 }
-                var inTypeAlias = context.flags & 8388608;
-                context.flags &= ~8388608;
+                var inTypeAlias = context.flags & 8388608 /* InTypeAlias */;
+                context.flags &= ~8388608 /* InTypeAlias */;
                 if (!type) {
                     context.encounteredError = true;
-                    return undefined;
+                    return undefined; // TODO: GH#18217
                 }
-                if (type.flags & 1) {
-                    return ts.createKeywordTypeNode(119);
+                if (type.flags & 1 /* Any */) {
+                    return ts.createKeywordTypeNode(119 /* AnyKeyword */);
                 }
-                if (type.flags & 2) {
-                    return ts.createKeywordTypeNode(142);
+                if (type.flags & 2 /* Unknown */) {
+                    return ts.createKeywordTypeNode(142 /* UnknownKeyword */);
                 }
-                if (type.flags & 4) {
-                    return ts.createKeywordTypeNode(137);
+                if (type.flags & 4 /* String */) {
+                    return ts.createKeywordTypeNode(137 /* StringKeyword */);
                 }
-                if (type.flags & 8) {
-                    return ts.createKeywordTypeNode(134);
+                if (type.flags & 8 /* Number */) {
+                    return ts.createKeywordTypeNode(134 /* NumberKeyword */);
                 }
-                if (type.flags & 16) {
-                    return ts.createKeywordTypeNode(122);
+                if (type.flags & 16 /* Boolean */) {
+                    return ts.createKeywordTypeNode(122 /* BooleanKeyword */);
                 }
-                if (type.flags & 512 && !(type.flags & 262144)) {
+                if (type.flags & 512 /* EnumLiteral */ && !(type.flags & 262144 /* Union */)) {
                     var parentSymbol = getParentOfSymbol(type.symbol);
-                    var parentName = symbolToName(parentSymbol, context, 67901928, false);
+                    var parentName = symbolToName(parentSymbol, context, 67901928 /* Type */, /*expectsIdentifier*/ false);
                     var enumLiteralName = getDeclaredTypeOfSymbol(parentSymbol) === type ? parentName : ts.createQualifiedName(parentName, ts.symbolName(type.symbol));
-                    return ts.createTypeReferenceNode(enumLiteralName, undefined);
+                    return ts.createTypeReferenceNode(enumLiteralName, /*typeArguments*/ undefined);
                 }
-                if (type.flags & 544) {
-                    var name = symbolToName(type.symbol, context, 67901928, false);
-                    return ts.createTypeReferenceNode(name, undefined);
+                if (type.flags & 544 /* EnumLike */) {
+                    var name = symbolToName(type.symbol, context, 67901928 /* Type */, /*expectsIdentifier*/ false);
+                    return ts.createTypeReferenceNode(name, /*typeArguments*/ undefined);
                 }
-                if (type.flags & (64)) {
-                    return ts.createLiteralTypeNode(ts.setEmitFlags(ts.createLiteral(type.value), 16777216));
+                if (type.flags & (64 /* StringLiteral */)) {
+                    return ts.createLiteralTypeNode(ts.setEmitFlags(ts.createLiteral(type.value), 16777216 /* NoAsciiEscaping */));
                 }
-                if (type.flags & (128)) {
+                if (type.flags & (128 /* NumberLiteral */)) {
                     return ts.createLiteralTypeNode((ts.createLiteral(type.value)));
                 }
-                if (type.flags & 256) {
+                if (type.flags & 256 /* BooleanLiteral */) {
                     return type.intrinsicName === "true" ? ts.createTrue() : ts.createFalse();
                 }
-                if (type.flags & 2048) {
-                    if (!(context.flags & 1048576)) {
+                if (type.flags & 2048 /* UniqueESSymbol */) {
+                    if (!(context.flags & 1048576 /* AllowUniqueESSymbolType */)) {
                         if (isValueSymbolAccessible(type.symbol, context.enclosingDeclaration)) {
-                            return symbolToTypeNode(type.symbol, context, 67216319);
+                            return symbolToTypeNode(type.symbol, context, 67216319 /* Value */);
                         }
                         if (context.tracker.reportInaccessibleUniqueSymbolError) {
                             context.tracker.reportInaccessibleUniqueSymbolError();
                         }
                     }
-                    return ts.createTypeOperatorNode(141, ts.createKeywordTypeNode(138));
+                    return ts.createTypeOperatorNode(141 /* UniqueKeyword */, ts.createKeywordTypeNode(138 /* SymbolKeyword */));
                 }
-                if (type.flags & 4096) {
-                    return ts.createKeywordTypeNode(105);
+                if (type.flags & 4096 /* Void */) {
+                    return ts.createKeywordTypeNode(105 /* VoidKeyword */);
                 }
-                if (type.flags & 8192) {
-                    return ts.createKeywordTypeNode(140);
+                if (type.flags & 8192 /* Undefined */) {
+                    return ts.createKeywordTypeNode(140 /* UndefinedKeyword */);
                 }
-                if (type.flags & 16384) {
-                    return ts.createKeywordTypeNode(95);
+                if (type.flags & 16384 /* Null */) {
+                    return ts.createKeywordTypeNode(95 /* NullKeyword */);
                 }
-                if (type.flags & 32768) {
-                    return ts.createKeywordTypeNode(131);
+                if (type.flags & 32768 /* Never */) {
+                    return ts.createKeywordTypeNode(131 /* NeverKeyword */);
                 }
-                if (type.flags & 1024) {
-                    return ts.createKeywordTypeNode(138);
+                if (type.flags & 1024 /* ESSymbol */) {
+                    return ts.createKeywordTypeNode(138 /* SymbolKeyword */);
                 }
-                if (type.flags & 16777216) {
-                    return ts.createKeywordTypeNode(135);
+                if (type.flags & 16777216 /* NonPrimitive */) {
+                    return ts.createKeywordTypeNode(135 /* ObjectKeyword */);
                 }
-                if (type.flags & 65536 && type.isThisType) {
-                    if (context.flags & 4194304) {
-                        if (!context.encounteredError && !(context.flags & 32768)) {
+                if (type.flags & 65536 /* TypeParameter */ && type.isThisType) {
+                    if (context.flags & 4194304 /* InObjectTypeLiteral */) {
+                        if (!context.encounteredError && !(context.flags & 32768 /* AllowThisInObjectLiteral */)) {
                             context.encounteredError = true;
                         }
                         if (context.tracker.reportInaccessibleThisError) {
@@ -25389,61 +31903,63 @@ var ts;
                     return ts.createThis();
                 }
                 var objectFlags = ts.getObjectFlags(type);
-                if (objectFlags & 4) {
-                    ts.Debug.assert(!!(type.flags & 131072));
+                if (objectFlags & 4 /* Reference */) {
+                    ts.Debug.assert(!!(type.flags & 131072 /* Object */));
                     return typeReferenceToTypeNode(type);
                 }
-                if (type.flags & 65536 || objectFlags & 3) {
-                    if (type.flags & 65536 && ts.contains(context.inferTypeParameters, type)) {
-                        return ts.createInferTypeNode(typeParameterToDeclarationWithConstraint(type, context, undefined));
+                if (type.flags & 65536 /* TypeParameter */ || objectFlags & 3 /* ClassOrInterface */) {
+                    if (type.flags & 65536 /* TypeParameter */ && ts.contains(context.inferTypeParameters, type)) {
+                        return ts.createInferTypeNode(typeParameterToDeclarationWithConstraint(type, context, /*constraintNode*/ undefined));
                     }
-                    if (context.flags & 4 &&
-                        type.flags & 65536 &&
+                    if (context.flags & 4 /* GenerateNamesForShadowedTypeParams */ &&
+                        type.flags & 65536 /* TypeParameter */ &&
                         ts.length(type.symbol.declarations) &&
                         ts.isTypeParameterDeclaration(type.symbol.declarations[0]) &&
                         typeParameterShadowsNameInScope(type, context) &&
                         !isTypeSymbolAccessible(type.symbol, context.enclosingDeclaration)) {
-                        return ts.createTypeReferenceNode(ts.getGeneratedNameForNode(type.symbol.declarations[0].name, 16 | 8), undefined);
+                        return ts.createTypeReferenceNode(ts.getGeneratedNameForNode(type.symbol.declarations[0].name, 16 /* Optimistic */ | 8 /* ReservedInNestedScopes */), /*typeArguments*/ undefined);
                     }
+                    // Ignore constraint/default when creating a usage (as opposed to declaration) of a type parameter.
                     return type.symbol
-                        ? symbolToTypeNode(type.symbol, context, 67901928)
-                        : ts.createTypeReferenceNode(ts.createIdentifier("?"), undefined);
+                        ? symbolToTypeNode(type.symbol, context, 67901928 /* Type */)
+                        : ts.createTypeReferenceNode(ts.createIdentifier("?"), /*typeArguments*/ undefined);
                 }
-                if (!inTypeAlias && type.aliasSymbol && (context.flags & 16384 || isTypeSymbolAccessible(type.aliasSymbol, context.enclosingDeclaration))) {
+                if (!inTypeAlias && type.aliasSymbol && (context.flags & 16384 /* UseAliasDefinedOutsideCurrentScope */ || isTypeSymbolAccessible(type.aliasSymbol, context.enclosingDeclaration))) {
                     var typeArgumentNodes = mapToTypeNodes(type.aliasTypeArguments, context);
-                    if (isReservedMemberName(type.aliasSymbol.escapedName) && !(type.aliasSymbol.flags & 32))
+                    if (isReservedMemberName(type.aliasSymbol.escapedName) && !(type.aliasSymbol.flags & 32 /* Class */))
                         return ts.createTypeReferenceNode(ts.createIdentifier(""), typeArgumentNodes);
-                    return symbolToTypeNode(type.aliasSymbol, context, 67901928, typeArgumentNodes);
+                    return symbolToTypeNode(type.aliasSymbol, context, 67901928 /* Type */, typeArgumentNodes);
                 }
-                if (type.flags & (262144 | 524288)) {
-                    var types = type.flags & 262144 ? formatUnionTypes(type.types) : type.types;
+                if (type.flags & (262144 /* Union */ | 524288 /* Intersection */)) {
+                    var types = type.flags & 262144 /* Union */ ? formatUnionTypes(type.types) : type.types;
                     var typeNodes = mapToTypeNodes(types, context);
                     if (typeNodes && typeNodes.length > 0) {
-                        var unionOrIntersectionTypeNode = ts.createUnionOrIntersectionTypeNode(type.flags & 262144 ? 169 : 170, typeNodes);
+                        var unionOrIntersectionTypeNode = ts.createUnionOrIntersectionTypeNode(type.flags & 262144 /* Union */ ? 169 /* UnionType */ : 170 /* IntersectionType */, typeNodes);
                         return unionOrIntersectionTypeNode;
                     }
                     else {
-                        if (!context.encounteredError && !(context.flags & 262144)) {
+                        if (!context.encounteredError && !(context.flags & 262144 /* AllowEmptyUnionOrIntersection */)) {
                             context.encounteredError = true;
                         }
-                        return undefined;
+                        return undefined; // TODO: GH#18217
                     }
                 }
-                if (objectFlags & (16 | 32)) {
-                    ts.Debug.assert(!!(type.flags & 131072));
+                if (objectFlags & (16 /* Anonymous */ | 32 /* Mapped */)) {
+                    ts.Debug.assert(!!(type.flags & 131072 /* Object */));
+                    // The type is an object literal type.
                     return createAnonymousTypeNode(type);
                 }
-                if (type.flags & 1048576) {
+                if (type.flags & 1048576 /* Index */) {
                     var indexedType = type.type;
                     var indexTypeNode = typeToTypeNodeHelper(indexedType, context);
                     return ts.createTypeOperatorNode(indexTypeNode);
                 }
-                if (type.flags & 2097152) {
+                if (type.flags & 2097152 /* IndexedAccess */) {
                     var objectTypeNode = typeToTypeNodeHelper(type.objectType, context);
                     var indexTypeNode = typeToTypeNodeHelper(type.indexType, context);
                     return ts.createIndexedAccessTypeNode(objectTypeNode, indexTypeNode);
                 }
-                if (type.flags & 4194304) {
+                if (type.flags & 4194304 /* Conditional */) {
                     var checkTypeNode = typeToTypeNodeHelper(type.checkType, context);
                     var saveInferTypeParameters = context.inferTypeParameters;
                     context.inferTypeParameters = type.root.inferTypeParameters;
@@ -25453,16 +31969,18 @@ var ts;
                     var falseTypeNode = typeToTypeNodeHelper(getFalseTypeFromConditionalType(type), context);
                     return ts.createConditionalTypeNode(checkTypeNode, extendsTypeNode, trueTypeNode, falseTypeNode);
                 }
-                if (type.flags & 8388608) {
+                if (type.flags & 8388608 /* Substitution */) {
                     return typeToTypeNodeHelper(type.typeVariable, context);
                 }
                 return ts.Debug.fail("Should be unreachable.");
                 function createMappedTypeNodeFromType(type) {
-                    ts.Debug.assert(!!(type.flags & 131072));
+                    ts.Debug.assert(!!(type.flags & 131072 /* Object */));
                     var readonlyToken = type.declaration.readonlyToken ? ts.createToken(type.declaration.readonlyToken.kind) : undefined;
                     var questionToken = type.declaration.questionToken ? ts.createToken(type.declaration.questionToken.kind) : undefined;
                     var appropriateConstraintTypeNode;
                     if (isMappedTypeWithKeyofConstraintDeclaration(type)) {
+                        // We have a { [P in keyof T]: X }
+                        // We do this to ensure we retain the toplevel keyof-ness of the type which may be lost due to keyof distribution during `getConstraintTypeFromMappedType`
                         appropriateConstraintTypeNode = ts.createTypeOperatorNode(typeToTypeNodeHelper(getModifiersTypeFromMappedType(type), context));
                     }
                     else {
@@ -25471,33 +31989,39 @@ var ts;
                     var typeParameterNode = typeParameterToDeclarationWithConstraint(getTypeParameterFromMappedType(type), context, appropriateConstraintTypeNode);
                     var templateTypeNode = typeToTypeNodeHelper(getTemplateTypeFromMappedType(type), context);
                     var mappedTypeNode = ts.createMappedTypeNode(readonlyToken, typeParameterNode, questionToken, templateTypeNode);
-                    return ts.setEmitFlags(mappedTypeNode, 1);
+                    return ts.setEmitFlags(mappedTypeNode, 1 /* SingleLine */);
                 }
                 function createAnonymousTypeNode(type) {
                     var symbol = type.symbol;
                     var id;
                     if (symbol) {
-                        var isConstructorObject = ts.getObjectFlags(type) & 16 && type.symbol && type.symbol.flags & 32;
+                        var isConstructorObject = ts.getObjectFlags(type) & 16 /* Anonymous */ && type.symbol && type.symbol.flags & 32 /* Class */;
                         id = (isConstructorObject ? "+" : "") + getSymbolId(symbol);
                         if (isJavaScriptConstructor(symbol.valueDeclaration)) {
-                            var isInstanceType = type === getInferredClassType(symbol) ? 67901928 : 67216319;
+                            // Instance and static types share the same symbol; only add 'typeof' for the static side.
+                            var isInstanceType = type === getInferredClassType(symbol) ? 67901928 /* Type */ : 67216319 /* Value */;
                             return symbolToTypeNode(symbol, context, isInstanceType);
                         }
-                        else if (symbol.flags & 32 && !getBaseTypeVariableOfClass(symbol) && !(symbol.valueDeclaration.kind === 205 && context.flags & 2048) ||
-                            symbol.flags & (384 | 512) ||
+                        // Always use 'typeof T' for type of class, enum, and module objects
+                        else if (symbol.flags & 32 /* Class */ && !getBaseTypeVariableOfClass(symbol) && !(symbol.valueDeclaration.kind === 205 /* ClassExpression */ && context.flags & 2048 /* WriteClassExpressionAsTypeLiteral */) ||
+                            symbol.flags & (384 /* Enum */ | 512 /* ValueModule */) ||
                             shouldWriteTypeOfFunctionSymbol()) {
-                            return symbolToTypeNode(symbol, context, 67216319);
+                            return symbolToTypeNode(symbol, context, 67216319 /* Value */);
                         }
                         else if (context.visitedSymbols && context.visitedSymbols.has(id)) {
+                            // If type is an anonymous type literal in a type alias declaration, use type alias name
                             var typeAlias = getTypeAliasForTypeLiteral(type);
                             if (typeAlias) {
-                                return symbolToTypeNode(typeAlias, context, 67901928);
+                                // The specified symbol flags need to be reinterpreted as type flags
+                                return symbolToTypeNode(typeAlias, context, 67901928 /* Type */);
                             }
                             else {
-                                return ts.createKeywordTypeNode(119);
+                                return ts.createKeywordTypeNode(119 /* AnyKeyword */);
                             }
                         }
                         else {
+                            // Since instantiations of the same anonymous type have the same symbol, tracking symbols instead
+                            // of types allows us to catch circular references to instantiations of the same anonymous type
                             if (!context.visitedSymbols) {
                                 context.visitedSymbols = ts.createMap();
                             }
@@ -25508,19 +32032,21 @@ var ts;
                         }
                     }
                     else {
+                        // Anonymous types without a symbol are never circular.
                         return createTypeNodeFromObjectType(type);
                     }
                     function shouldWriteTypeOfFunctionSymbol() {
-                        var isStaticMethodSymbol = !!(symbol.flags & 8192) &&
-                            ts.some(symbol.declarations, function (declaration) { return ts.hasModifier(declaration, 32); });
-                        var isNonLocalFunctionSymbol = !!(symbol.flags & 16) &&
-                            (symbol.parent ||
+                        var isStaticMethodSymbol = !!(symbol.flags & 8192 /* Method */) && // typeof static method
+                            ts.some(symbol.declarations, function (declaration) { return ts.hasModifier(declaration, 32 /* Static */); });
+                        var isNonLocalFunctionSymbol = !!(symbol.flags & 16 /* Function */) &&
+                            (symbol.parent || // is exported function symbol
                                 ts.forEach(symbol.declarations, function (declaration) {
-                                    return declaration.parent.kind === 274 || declaration.parent.kind === 240;
+                                    return declaration.parent.kind === 274 /* SourceFile */ || declaration.parent.kind === 240 /* ModuleBlock */;
                                 }));
                         if (isStaticMethodSymbol || isNonLocalFunctionSymbol) {
-                            return (!!(context.flags & 4096) || (context.visitedSymbols && context.visitedSymbols.has(id))) &&
-                                (!(context.flags & 8) || isValueSymbolAccessible(symbol, context.enclosingDeclaration));
+                            // typeof is allowed only for static/non local functions
+                            return (!!(context.flags & 4096 /* UseTypeOfFunction */) || (context.visitedSymbols && context.visitedSymbols.has(id))) && // it is type of the symbol uses itself recursively
+                                (!(context.flags & 8 /* UseStructuralFallback */) || isValueSymbolAccessible(symbol, context.enclosingDeclaration)); // TODO: GH#18217 // And the build is going to succeed without visibility error or there is no structural fallback allowed
                         }
                     }
                 }
@@ -25531,50 +32057,50 @@ var ts;
                     var resolved = resolveStructuredTypeMembers(type);
                     if (!resolved.properties.length && !resolved.stringIndexInfo && !resolved.numberIndexInfo) {
                         if (!resolved.callSignatures.length && !resolved.constructSignatures.length) {
-                            return ts.setEmitFlags(ts.createTypeLiteralNode(undefined), 1);
+                            return ts.setEmitFlags(ts.createTypeLiteralNode(/*members*/ undefined), 1 /* SingleLine */);
                         }
                         if (resolved.callSignatures.length === 1 && !resolved.constructSignatures.length) {
                             var signature = resolved.callSignatures[0];
-                            var signatureNode = signatureToSignatureDeclarationHelper(signature, 163, context);
+                            var signatureNode = signatureToSignatureDeclarationHelper(signature, 163 /* FunctionType */, context);
                             return signatureNode;
                         }
                         if (resolved.constructSignatures.length === 1 && !resolved.callSignatures.length) {
                             var signature = resolved.constructSignatures[0];
-                            var signatureNode = signatureToSignatureDeclarationHelper(signature, 164, context);
+                            var signatureNode = signatureToSignatureDeclarationHelper(signature, 164 /* ConstructorType */, context);
                             return signatureNode;
                         }
                     }
                     var savedFlags = context.flags;
-                    context.flags |= 4194304;
+                    context.flags |= 4194304 /* InObjectTypeLiteral */;
                     var members = createTypeNodesFromResolvedType(resolved);
                     context.flags = savedFlags;
                     var typeLiteralNode = ts.createTypeLiteralNode(members);
-                    return ts.setEmitFlags(typeLiteralNode, (context.flags & 1024) ? 0 : 1);
+                    return ts.setEmitFlags(typeLiteralNode, (context.flags & 1024 /* MultilineObjectLiterals */) ? 0 : 1 /* SingleLine */);
                 }
                 function typeReferenceToTypeNode(type) {
                     var typeArguments = type.typeArguments || ts.emptyArray;
                     if (type.target === globalArrayType) {
-                        if (context.flags & 2) {
+                        if (context.flags & 2 /* WriteArrayAsGenericType */) {
                             var typeArgumentNode = typeToTypeNodeHelper(typeArguments[0], context);
                             return ts.createTypeReferenceNode("Array", [typeArgumentNode]);
                         }
                         var elementType = typeToTypeNodeHelper(typeArguments[0], context);
                         return ts.createArrayTypeNode(elementType);
                     }
-                    else if (type.target.objectFlags & 8) {
+                    else if (type.target.objectFlags & 8 /* Tuple */) {
                         if (typeArguments.length > 0) {
                             var tupleConstituentNodes = mapToTypeNodes(typeArguments.slice(0, getTypeReferenceArity(type)), context);
                             if (tupleConstituentNodes && tupleConstituentNodes.length > 0) {
                                 return ts.createTupleTypeNode(tupleConstituentNodes);
                             }
                         }
-                        if (context.encounteredError || (context.flags & 524288)) {
+                        if (context.encounteredError || (context.flags & 524288 /* AllowEmptyTuple */)) {
                             return ts.createTupleTypeNode([]);
                         }
                         context.encounteredError = true;
-                        return undefined;
+                        return undefined; // TODO: GH#18217
                     }
-                    else if (context.flags & 2048 &&
+                    else if (context.flags & 2048 /* WriteClassExpressionAsTypeLiteral */ &&
                         type.symbol.valueDeclaration &&
                         ts.isClassLike(type.symbol.valueDeclaration) &&
                         !isValueSymbolAccessible(type.symbol, context.enclosingDeclaration)) {
@@ -25587,16 +32113,19 @@ var ts;
                         if (outerTypeParameters) {
                             var length_1 = outerTypeParameters.length;
                             while (i < length_1) {
+                                // Find group of type arguments for type parameters with the same declaring container.
                                 var start = i;
                                 var parent = getParentSymbolOfTypeParameter(outerTypeParameters[i]);
                                 do {
                                     i++;
                                 } while (i < length_1 && getParentSymbolOfTypeParameter(outerTypeParameters[i]) === parent);
+                                // When type parameters are their own type arguments for the whole group (i.e. we have
+                                // the default outer type arguments), we don't show the group.
                                 if (!ts.rangeEquals(outerTypeParameters, typeArguments, start, i)) {
                                     var typeArgumentSlice = mapToTypeNodes(typeArguments.slice(start, i), context);
                                     var flags_2 = context.flags;
-                                    context.flags |= 16;
-                                    var ref = symbolToTypeNode(parent, context, 67901928, typeArgumentSlice);
+                                    context.flags |= 16 /* ForbidIndexedAccessSymbolReferences */;
+                                    var ref = symbolToTypeNode(parent, context, 67901928 /* Type */, typeArgumentSlice);
                                     context.flags = flags_2;
                                     resultType = !resultType ? ref : appendReferenceToType(resultType, ref);
                                 }
@@ -25608,19 +32137,21 @@ var ts;
                             typeArgumentNodes = mapToTypeNodes(typeArguments.slice(i, typeParameterCount), context);
                         }
                         var flags = context.flags;
-                        context.flags |= 16;
-                        var finalRef = symbolToTypeNode(type.symbol, context, 67901928, typeArgumentNodes);
+                        context.flags |= 16 /* ForbidIndexedAccessSymbolReferences */;
+                        var finalRef = symbolToTypeNode(type.symbol, context, 67901928 /* Type */, typeArgumentNodes);
                         context.flags = flags;
                         return !resultType ? finalRef : appendReferenceToType(resultType, finalRef);
                     }
                 }
                 function appendReferenceToType(root, ref) {
                     if (ts.isImportTypeNode(root)) {
+                        // first shift type arguments
                         var innerParams = root.typeArguments;
                         if (root.qualifier) {
                             (ts.isIdentifier(root.qualifier) ? root.qualifier : root.qualifier.right).typeArguments = innerParams;
                         }
                         root.typeArguments = ref.typeArguments;
+                        // then move qualifiers
                         var ids = getAccessStack(ref);
                         for (var _i = 0, ids_1 = ids; _i < ids_1.length; _i++) {
                             var id = ids_1[_i];
@@ -25629,9 +32160,11 @@ var ts;
                         return root;
                     }
                     else {
+                        // first shift type arguments
                         var innerParams = root.typeArguments;
                         (ts.isIdentifier(root.typeName) ? root.typeName : root.typeName.right).typeArguments = innerParams;
                         root.typeArguments = ref.typeArguments;
+                        // then move qualifiers
                         var ids = getAccessStack(ref);
                         for (var _a = 0, ids_2 = ids; _a < ids_2.length; _a++) {
                             var id = ids_2[_a];
@@ -25654,20 +32187,20 @@ var ts;
                     var typeElements = [];
                     for (var _i = 0, _a = resolvedType.callSignatures; _i < _a.length; _i++) {
                         var signature = _a[_i];
-                        typeElements.push(signatureToSignatureDeclarationHelper(signature, 158, context));
+                        typeElements.push(signatureToSignatureDeclarationHelper(signature, 158 /* CallSignature */, context));
                     }
                     for (var _b = 0, _c = resolvedType.constructSignatures; _b < _c.length; _b++) {
                         var signature = _c[_b];
-                        typeElements.push(signatureToSignatureDeclarationHelper(signature, 159, context));
+                        typeElements.push(signatureToSignatureDeclarationHelper(signature, 159 /* ConstructSignature */, context));
                     }
                     if (resolvedType.stringIndexInfo) {
-                        var indexInfo = resolvedType.objectFlags & 2048 ?
+                        var indexInfo = resolvedType.objectFlags & 2048 /* ReverseMapped */ ?
                             createIndexInfo(anyType, resolvedType.stringIndexInfo.isReadonly, resolvedType.stringIndexInfo.declaration) :
                             resolvedType.stringIndexInfo;
-                        typeElements.push(indexInfoToIndexSignatureDeclarationHelper(indexInfo, 0, context));
+                        typeElements.push(indexInfoToIndexSignatureDeclarationHelper(indexInfo, 0 /* String */, context));
                     }
                     if (resolvedType.numberIndexInfo) {
-                        typeElements.push(indexInfoToIndexSignatureDeclarationHelper(resolvedType.numberIndexInfo, 1, context));
+                        typeElements.push(indexInfoToIndexSignatureDeclarationHelper(resolvedType.numberIndexInfo, 1 /* Number */, context));
                     }
                     var properties = resolvedType.properties;
                     if (!properties) {
@@ -25675,36 +32208,41 @@ var ts;
                     }
                     for (var _d = 0, properties_1 = properties; _d < properties_1.length; _d++) {
                         var propertySymbol = properties_1[_d];
-                        if (context.flags & 2048) {
-                            if (propertySymbol.flags & 4194304) {
+                        if (context.flags & 2048 /* WriteClassExpressionAsTypeLiteral */) {
+                            if (propertySymbol.flags & 4194304 /* Prototype */) {
                                 continue;
                             }
-                            if (ts.getDeclarationModifierFlagsFromSymbol(propertySymbol) & (8 | 16) && context.tracker.reportPrivateInBaseOfClassExpression) {
+                            if (ts.getDeclarationModifierFlagsFromSymbol(propertySymbol) & (8 /* Private */ | 16 /* Protected */) && context.tracker.reportPrivateInBaseOfClassExpression) {
                                 context.tracker.reportPrivateInBaseOfClassExpression(ts.unescapeLeadingUnderscores(propertySymbol.escapedName));
                             }
                         }
-                        var propertyType = ts.getCheckFlags(propertySymbol) & 2048 && context.flags & 33554432 ?
+                        var propertyType = ts.getCheckFlags(propertySymbol) & 2048 /* ReverseMapped */ && context.flags & 33554432 /* InReverseMappedType */ ?
                             anyType : getTypeOfSymbol(propertySymbol);
                         var saveEnclosingDeclaration = context.enclosingDeclaration;
                         context.enclosingDeclaration = undefined;
-                        if (ts.getCheckFlags(propertySymbol) & 1024) {
+                        if (ts.getCheckFlags(propertySymbol) & 1024 /* Late */) {
                             var decl = ts.first(propertySymbol.declarations);
-                            var name = hasLateBindableName(decl) && resolveEntityName(decl.name.expression, 67216319);
-                            if (name && context.tracker.trackSymbol) {
-                                context.tracker.trackSymbol(name, saveEnclosingDeclaration, 67216319);
+                            if (context.tracker.trackSymbol && hasLateBindableName(decl)) {
+                                // get symbol of the first identifier of the entityName
+                                var firstIdentifier = getFirstIdentifier(decl.name.expression);
+                                var name = resolveName(firstIdentifier, firstIdentifier.escapedText, 67216319 /* Value */ | 1048576 /* ExportValue */, /*nodeNotFoundErrorMessage*/ undefined, /*nameArg*/ undefined, /*isUse*/ true);
+                                if (name) {
+                                    context.tracker.trackSymbol(name, saveEnclosingDeclaration, 67216319 /* Value */);
+                                }
                             }
                         }
-                        var propertyName = symbolToName(propertySymbol, context, 67216319, true);
+                        var propertyName = symbolToName(propertySymbol, context, 67216319 /* Value */, /*expectsIdentifier*/ true);
                         context.enclosingDeclaration = saveEnclosingDeclaration;
-                        var optionalToken = propertySymbol.flags & 16777216 ? ts.createToken(55) : undefined;
-                        if (propertySymbol.flags & (16 | 8192) && !getPropertiesOfObjectType(propertyType).length) {
-                            var signatures = getSignaturesOfType(propertyType, 0);
+                        var optionalToken = propertySymbol.flags & 16777216 /* Optional */ ? ts.createToken(55 /* QuestionToken */) : undefined;
+                        if (propertySymbol.flags & (16 /* Function */ | 8192 /* Method */) && !getPropertiesOfObjectType(propertyType).length) {
+                            var signatures = getSignaturesOfType(propertyType, 0 /* Call */);
                             for (var _e = 0, signatures_1 = signatures; _e < signatures_1.length; _e++) {
                                 var signature = signatures_1[_e];
-                                var methodDeclaration = signatureToSignatureDeclarationHelper(signature, 153, context);
+                                var methodDeclaration = signatureToSignatureDeclarationHelper(signature, 153 /* MethodSignature */, context);
                                 methodDeclaration.name = propertyName;
                                 methodDeclaration.questionToken = optionalToken;
                                 if (propertySymbol.valueDeclaration) {
+                                    // Copy comments to node for declaration emit
                                     ts.setCommentRange(methodDeclaration, propertySymbol.valueDeclaration);
                                 }
                                 typeElements.push(methodDeclaration);
@@ -25712,12 +32250,14 @@ var ts;
                         }
                         else {
                             var savedFlags = context.flags;
-                            context.flags |= !!(ts.getCheckFlags(propertySymbol) & 2048) ? 33554432 : 0;
-                            var propertyTypeNode = propertyType ? typeToTypeNodeHelper(propertyType, context) : ts.createKeywordTypeNode(119);
+                            context.flags |= !!(ts.getCheckFlags(propertySymbol) & 2048 /* ReverseMapped */) ? 33554432 /* InReverseMappedType */ : 0;
+                            var propertyTypeNode = propertyType ? typeToTypeNodeHelper(propertyType, context) : ts.createKeywordTypeNode(119 /* AnyKeyword */);
                             context.flags = savedFlags;
-                            var modifiers = isReadonlySymbol(propertySymbol) ? [ts.createToken(132)] : undefined;
-                            var propertySignature = ts.createPropertySignature(modifiers, propertyName, optionalToken, propertyTypeNode, undefined);
+                            var modifiers = isReadonlySymbol(propertySymbol) ? [ts.createToken(132 /* ReadonlyKeyword */)] : undefined;
+                            var propertySignature = ts.createPropertySignature(modifiers, propertyName, optionalToken, propertyTypeNode, 
+                            /*initializer*/ undefined);
                             if (propertySymbol.valueDeclaration) {
+                                // Copy comments to node for declaration emit
                                 ts.setCommentRange(propertySignature, propertySymbol.valueDeclaration);
                             }
                             typeElements.push(propertySignature);
@@ -25741,24 +32281,30 @@ var ts;
             }
             function indexInfoToIndexSignatureDeclarationHelper(indexInfo, kind, context) {
                 var name = ts.getNameFromIndexInfo(indexInfo) || "x";
-                var indexerTypeNode = ts.createKeywordTypeNode(kind === 0 ? 137 : 134);
-                var indexingParameter = ts.createParameter(undefined, undefined, undefined, name, undefined, indexerTypeNode, undefined);
+                var indexerTypeNode = ts.createKeywordTypeNode(kind === 0 /* String */ ? 137 /* StringKeyword */ : 134 /* NumberKeyword */);
+                var indexingParameter = ts.createParameter(
+                /*decorators*/ undefined, 
+                /*modifiers*/ undefined, 
+                /*dotDotDotToken*/ undefined, name, 
+                /*questionToken*/ undefined, indexerTypeNode, 
+                /*initializer*/ undefined);
                 var typeNode = typeToTypeNodeHelper(indexInfo.type || anyType, context);
-                if (!indexInfo.type && !(context.flags & 2097152)) {
+                if (!indexInfo.type && !(context.flags & 2097152 /* AllowEmptyIndexInfoType */)) {
                     context.encounteredError = true;
                 }
-                return ts.createIndexSignature(undefined, indexInfo.isReadonly ? [ts.createToken(132)] : undefined, [indexingParameter], typeNode);
+                return ts.createIndexSignature(
+                /*decorators*/ undefined, indexInfo.isReadonly ? [ts.createToken(132 /* ReadonlyKeyword */)] : undefined, [indexingParameter], typeNode);
             }
             function signatureToSignatureDeclarationHelper(signature, kind, context) {
                 var typeParameters;
                 var typeArguments;
-                if (context.flags & 32 && signature.target && signature.mapper && signature.target.typeParameters) {
+                if (context.flags & 32 /* WriteTypeArgumentsOfSignature */ && signature.target && signature.mapper && signature.target.typeParameters) {
                     typeArguments = signature.target.typeParameters.map(function (parameter) { return typeToTypeNodeHelper(instantiateType(parameter, signature.mapper), context); });
                 }
                 else {
                     typeParameters = signature.typeParameters && signature.typeParameters.map(function (parameter) { return typeParameterToDeclaration(parameter, context); });
                 }
-                var parameters = signature.parameters.map(function (parameter) { return symbolToParameterDeclaration(parameter, context, kind === 155); });
+                var parameters = signature.parameters.map(function (parameter) { return symbolToParameterDeclaration(parameter, context, kind === 155 /* Constructor */); });
                 if (signature.thisParameter) {
                     var thisParameter = symbolToParameterDeclaration(signature.thisParameter, context);
                     parameters.unshift(thisParameter);
@@ -25766,8 +32312,8 @@ var ts;
                 var returnTypeNode;
                 var typePredicate = getTypePredicateOfSignature(signature);
                 if (typePredicate) {
-                    var parameterName = typePredicate.kind === 1 ?
-                        ts.setEmitFlags(ts.createIdentifier(typePredicate.parameterName), 16777216) :
+                    var parameterName = typePredicate.kind === 1 /* Identifier */ ?
+                        ts.setEmitFlags(ts.createIdentifier(typePredicate.parameterName), 16777216 /* NoAsciiEscaping */) :
                         ts.createThisTypeNode();
                     var typeNode = typeToTypeNodeHelper(typePredicate.type, context);
                     returnTypeNode = ts.createTypePredicateNode(parameterName, typeNode);
@@ -25776,29 +32322,29 @@ var ts;
                     var returnType = getReturnTypeOfSignature(signature);
                     returnTypeNode = returnType && typeToTypeNodeHelper(returnType, context);
                 }
-                if (context.flags & 256) {
-                    if (returnTypeNode && returnTypeNode.kind === 119) {
+                if (context.flags & 256 /* SuppressAnyReturnType */) {
+                    if (returnTypeNode && returnTypeNode.kind === 119 /* AnyKeyword */) {
                         returnTypeNode = undefined;
                     }
                 }
                 else if (!returnTypeNode) {
-                    returnTypeNode = ts.createKeywordTypeNode(119);
+                    returnTypeNode = ts.createKeywordTypeNode(119 /* AnyKeyword */);
                 }
                 return ts.createSignatureDeclaration(kind, typeParameters, parameters, returnTypeNode, typeArguments);
             }
             function typeParameterShadowsNameInScope(type, context) {
-                return !!resolveName(context.enclosingDeclaration, type.symbol.escapedName, 67901928, undefined, type.symbol.escapedName, false);
+                return !!resolveName(context.enclosingDeclaration, type.symbol.escapedName, 67901928 /* Type */, /*nameNotFoundArg*/ undefined, type.symbol.escapedName, /*isUse*/ false);
             }
             function typeParameterToDeclarationWithConstraint(type, context, constraintNode) {
                 var savedContextFlags = context.flags;
-                context.flags &= ~512;
-                var shouldUseGeneratedName = context.flags & 4 &&
+                context.flags &= ~512 /* WriteTypeParametersInQualifiedName */; // Avoids potential infinite loop when building for a claimspace with a generic
+                var shouldUseGeneratedName = context.flags & 4 /* GenerateNamesForShadowedTypeParams */ &&
                     type.symbol.declarations[0] &&
                     ts.isTypeParameterDeclaration(type.symbol.declarations[0]) &&
                     typeParameterShadowsNameInScope(type, context);
                 var name = shouldUseGeneratedName
-                    ? ts.getGeneratedNameForNode(type.symbol.declarations[0].name, 16 | 8)
-                    : symbolToName(type.symbol, context, 67901928, true);
+                    ? ts.getGeneratedNameForNode(type.symbol.declarations[0].name, 16 /* Optimistic */ | 8 /* ReservedInNestedScopes */)
+                    : symbolToName(type.symbol, context, 67901928 /* Type */, /*expectsIdentifier*/ true);
                 var defaultParameter = getDefaultFromTypeParameter(type);
                 var defaultParameterNode = defaultParameter && typeToTypeNodeHelper(defaultParameter, context);
                 context.flags = savedContextFlags;
@@ -25810,60 +32356,65 @@ var ts;
                 return typeParameterToDeclarationWithConstraint(type, context, constraintNode);
             }
             function symbolToParameterDeclaration(parameterSymbol, context, preserveModifierFlags) {
-                var parameterDeclaration = ts.getDeclarationOfKind(parameterSymbol, 149);
+                var parameterDeclaration = ts.getDeclarationOfKind(parameterSymbol, 149 /* Parameter */);
                 if (!parameterDeclaration && !isTransientSymbol(parameterSymbol)) {
-                    parameterDeclaration = ts.getDeclarationOfKind(parameterSymbol, 293);
+                    parameterDeclaration = ts.getDeclarationOfKind(parameterSymbol, 293 /* JSDocParameterTag */);
                 }
                 var parameterType = getTypeOfSymbol(parameterSymbol);
                 if (parameterDeclaration && isRequiredInitializedParameter(parameterDeclaration)) {
                     parameterType = getOptionalType(parameterType);
                 }
                 var parameterTypeNode = typeToTypeNodeHelper(parameterType, context);
-                var modifiers = !(context.flags & 8192) && preserveModifierFlags && parameterDeclaration && parameterDeclaration.modifiers ? parameterDeclaration.modifiers.map(ts.getSynthesizedClone) : undefined;
+                var modifiers = !(context.flags & 8192 /* OmitParameterModifiers */) && preserveModifierFlags && parameterDeclaration && parameterDeclaration.modifiers ? parameterDeclaration.modifiers.map(ts.getSynthesizedClone) : undefined;
                 var isRest = parameterDeclaration ? ts.isRestParameter(parameterDeclaration) : parameterSymbol.isRestParameter;
-                var dotDotDotToken = isRest ? ts.createToken(24) : undefined;
+                var dotDotDotToken = isRest ? ts.createToken(24 /* DotDotDotToken */) : undefined;
                 var name = parameterDeclaration
                     ? parameterDeclaration.name ?
-                        parameterDeclaration.name.kind === 71 ? ts.setEmitFlags(ts.getSynthesizedClone(parameterDeclaration.name), 16777216) :
-                            parameterDeclaration.name.kind === 146 ? ts.setEmitFlags(ts.getSynthesizedClone(parameterDeclaration.name.right), 16777216) :
+                        parameterDeclaration.name.kind === 71 /* Identifier */ ? ts.setEmitFlags(ts.getSynthesizedClone(parameterDeclaration.name), 16777216 /* NoAsciiEscaping */) :
+                            parameterDeclaration.name.kind === 146 /* QualifiedName */ ? ts.setEmitFlags(ts.getSynthesizedClone(parameterDeclaration.name.right), 16777216 /* NoAsciiEscaping */) :
                                 cloneBindingName(parameterDeclaration.name) :
                         ts.symbolName(parameterSymbol)
                     : ts.symbolName(parameterSymbol);
-                var questionToken = parameterDeclaration && isOptionalParameter(parameterDeclaration) ? ts.createToken(55) : undefined;
-                var parameterNode = ts.createParameter(undefined, modifiers, dotDotDotToken, name, questionToken, parameterTypeNode, undefined);
+                var questionToken = parameterDeclaration && isOptionalParameter(parameterDeclaration) ? ts.createToken(55 /* QuestionToken */) : undefined;
+                var parameterNode = ts.createParameter(
+                /*decorators*/ undefined, modifiers, dotDotDotToken, name, questionToken, parameterTypeNode, 
+                /*initializer*/ undefined);
                 return parameterNode;
                 function cloneBindingName(node) {
                     return elideInitializerAndSetEmitFlags(node);
                     function elideInitializerAndSetEmitFlags(node) {
-                        var visited = ts.visitEachChild(node, elideInitializerAndSetEmitFlags, ts.nullTransformationContext, undefined, elideInitializerAndSetEmitFlags);
+                        var visited = ts.visitEachChild(node, elideInitializerAndSetEmitFlags, ts.nullTransformationContext, /*nodesVisitor*/ undefined, elideInitializerAndSetEmitFlags);
                         var clone = ts.nodeIsSynthesized(visited) ? visited : ts.getSynthesizedClone(visited);
-                        if (clone.kind === 182) {
+                        if (clone.kind === 182 /* BindingElement */) {
                             clone.initializer = undefined;
                         }
-                        return ts.setEmitFlags(clone, 1 | 16777216);
+                        return ts.setEmitFlags(clone, 1 /* SingleLine */ | 16777216 /* NoAsciiEscaping */);
                     }
                 }
             }
             function lookupSymbolChain(symbol, context, meaning, yieldModuleSymbol) {
-                context.tracker.trackSymbol(symbol, context.enclosingDeclaration, meaning);
+                context.tracker.trackSymbol(symbol, context.enclosingDeclaration, meaning); // TODO: GH#18217
+                // Try to get qualified name if the symbol is not a type parameter and there is an enclosing declaration.
                 var chain;
-                var isTypeParameter = symbol.flags & 262144;
-                if (!isTypeParameter && (context.enclosingDeclaration || context.flags & 64)) {
-                    chain = ts.Debug.assertDefined(getSymbolChain(symbol, meaning, true));
+                var isTypeParameter = symbol.flags & 262144 /* TypeParameter */;
+                if (!isTypeParameter && (context.enclosingDeclaration || context.flags & 64 /* UseFullyQualifiedType */)) {
+                    chain = ts.Debug.assertDefined(getSymbolChain(symbol, meaning, /*endOfChain*/ true));
                     ts.Debug.assert(chain && chain.length > 0);
                 }
                 else {
                     chain = [symbol];
                 }
                 return chain;
+                /** @param endOfChain Set to false for recursive calls; non-recursive calls should always output something. */
                 function getSymbolChain(symbol, meaning, endOfChain) {
-                    var accessibleSymbolChain = getAccessibleSymbolChain(symbol, context.enclosingDeclaration, meaning, !!(context.flags & 128));
+                    var accessibleSymbolChain = getAccessibleSymbolChain(symbol, context.enclosingDeclaration, meaning, !!(context.flags & 128 /* UseOnlyExternalAliasing */));
                     var parentSymbol;
                     if (!accessibleSymbolChain ||
                         needsQualification(accessibleSymbolChain[0], context.enclosingDeclaration, accessibleSymbolChain.length === 1 ? meaning : getQualifiedLeftMeaning(meaning))) {
+                        // Go up and add our parent.
                         var parent = getContainerOfSymbol(accessibleSymbolChain ? accessibleSymbolChain[0] : symbol);
                         if (parent) {
-                            var parentChain = getSymbolChain(parent, getQualifiedLeftMeaning(meaning), false);
+                            var parentChain = getSymbolChain(parent, getQualifiedLeftMeaning(meaning), /*endOfChain*/ false);
                             if (parentChain) {
                                 parentSymbol = parent;
                                 accessibleSymbolChain = parentChain.concat(accessibleSymbolChain || [getAliasForSymbolInContainer(parent, symbol) || symbol]);
@@ -25873,9 +32424,13 @@ var ts;
                     if (accessibleSymbolChain) {
                         return accessibleSymbolChain;
                     }
-                    if (endOfChain ||
+                    if (
+                    // If this is the last part of outputting the symbol, always output. The cases apply only to parent symbols.
+                    endOfChain ||
+                        // If a parent symbol is an external module, don't write it. (We prefer just `x` vs `"foo/bar".x`.)
                         (yieldModuleSymbol || !(!parentSymbol && ts.forEach(symbol.declarations, hasNonGlobalAugmentationExternalModuleSymbol))) &&
-                            !(symbol.flags & (2048 | 4096))) {
+                            // If a parent symbol is an anonymous type, don't write it.
+                            !(symbol.flags & (2048 /* TypeLiteral */ | 4096 /* ObjectLiteral */))) {
                         return [symbol];
                     }
                 }
@@ -25883,7 +32438,7 @@ var ts;
             function typeParametersToTypeParameterDeclarations(symbol, context) {
                 var typeParameterNodes;
                 var targetSymbol = getTargetSymbol(symbol);
-                if (targetSymbol.flags & (32 | 64 | 524288)) {
+                if (targetSymbol.flags & (32 /* Class */ | 64 /* Interface */ | 524288 /* TypeAlias */)) {
                     typeParameterNodes = ts.createNodeArray(ts.map(getLocalTypeParametersOfClassOrInterfaceOrTypeAlias(symbol), function (tp) { return typeParameterToDeclaration(tp, context); }));
                 }
                 return typeParameterNodes;
@@ -25892,11 +32447,11 @@ var ts;
                 ts.Debug.assert(chain && 0 <= index && index < chain.length);
                 var symbol = chain[index];
                 var typeParameterNodes;
-                if (context.flags & 512 && index < (chain.length - 1)) {
+                if (context.flags & 512 /* WriteTypeParametersInQualifiedName */ && index < (chain.length - 1)) {
                     var parentSymbol = symbol;
                     var nextSymbol = chain[index + 1];
-                    if (ts.getCheckFlags(nextSymbol) & 1) {
-                        var params = getTypeParametersOfClassOrInterface(parentSymbol.flags & 2097152 ? resolveAlias(parentSymbol) : parentSymbol);
+                    if (ts.getCheckFlags(nextSymbol) & 1 /* Instantiated */) {
+                        var params = getTypeParametersOfClassOrInterface(parentSymbol.flags & 2097152 /* Alias */ ? resolveAlias(parentSymbol) : parentSymbol);
                         typeParameterNodes = mapToTypeNodes(ts.map(params, nextSymbol.mapper), context);
                     }
                     else {
@@ -25905,6 +32460,9 @@ var ts;
                 }
                 return typeParameterNodes;
             }
+            /**
+             * Given A[B][C][D], finds A[B]
+             */
             function getTopmostIndexedAccessType(top) {
                 if (ts.isIndexedAccessTypeNode(top.objectType)) {
                     return getTopmostIndexedAccessType(top.objectType);
@@ -25912,12 +32470,13 @@ var ts;
                 return top;
             }
             function symbolToTypeNode(symbol, context, meaning, overrideTypeArguments) {
-                var chain = lookupSymbolChain(symbol, context, meaning, !(context.flags & 16384));
-                context.flags |= 16777216;
+                var chain = lookupSymbolChain(symbol, context, meaning, !(context.flags & 16384 /* UseAliasDefinedOutsideCurrentScope */)); // If we're using aliases outside the current scope, dont bother with the module
+                context.flags |= 16777216 /* InInitialEntityName */;
                 var rootName = getNameOfSymbolAsWritten(chain[0], context);
-                context.flags ^= 16777216;
-                var isTypeOf = meaning === 67216319;
+                context.flags ^= 16777216 /* InInitialEntityName */;
+                var isTypeOf = meaning === 67216319 /* Value */;
                 if (ambientModuleSymbolRegex.test(rootName)) {
+                    // module is root, must use `ImportTypeNode`
                     var nonRootParts = chain.length > 1 ? createAccessFromSymbolChain(chain, chain.length - 1, 1) : undefined;
                     var typeParameterNodes = overrideTypeArguments || lookupTypeParameterNodes(chain, 0, context);
                     var lit = ts.createLiteralTypeNode(ts.createLiteral(rootName.substring(1, rootName.length - 1)));
@@ -25936,7 +32495,7 @@ var ts;
                 }
                 var entityName = createAccessFromSymbolChain(chain, chain.length - 1, 0);
                 if (ts.isIndexedAccessTypeNode(entityName)) {
-                    return entityName;
+                    return entityName; // Indexed accesses can never be `typeof`
                 }
                 if (isTypeOf) {
                     return ts.createTypeQueryNode(entityName);
@@ -25951,14 +32510,15 @@ var ts;
                     var typeParameterNodes = index === (chain.length - 1) ? overrideTypeArguments : lookupTypeParameterNodes(chain, index, context);
                     var symbol = chain[index];
                     if (index === 0) {
-                        context.flags |= 16777216;
+                        context.flags |= 16777216 /* InInitialEntityName */;
                     }
                     var symbolName = getNameOfSymbolAsWritten(symbol, context);
                     if (index === 0) {
-                        context.flags ^= 16777216;
+                        context.flags ^= 16777216 /* InInitialEntityName */;
                     }
                     var parent = chain[index - 1];
-                    if (!(context.flags & 16) && parent && getMembersOfSymbol(parent) && getMembersOfSymbol(parent).get(symbol.escapedName) === symbol) {
+                    if (!(context.flags & 16 /* ForbidIndexedAccessSymbolReferences */) && parent && getMembersOfSymbol(parent) && getMembersOfSymbol(parent).get(symbol.escapedName) === symbol) {
+                        // Should use an indexed access
                         var LHS = createAccessFromSymbolChain(chain, index - 1, stopper);
                         if (ts.isIndexedAccessTypeNode(LHS)) {
                             return ts.createIndexedAccessTypeNode(LHS, ts.createLiteralTypeNode(ts.createLiteral(symbolName)));
@@ -25967,7 +32527,7 @@ var ts;
                             return ts.createIndexedAccessTypeNode(ts.createTypeReferenceNode(LHS, typeParameterNodes), ts.createLiteralTypeNode(ts.createLiteral(symbolName)));
                         }
                     }
-                    var identifier = ts.setEmitFlags(ts.createIdentifier(symbolName, typeParameterNodes), 16777216);
+                    var identifier = ts.setEmitFlags(ts.createIdentifier(symbolName, typeParameterNodes), 16777216 /* NoAsciiEscaping */);
                     identifier.symbol = symbol;
                     if (index > stopper) {
                         var LHS = createAccessFromSymbolChain(chain, index - 1, stopper);
@@ -25983,7 +32543,7 @@ var ts;
                 var chain = lookupSymbolChain(symbol, context, meaning);
                 if (expectsIdentifier && chain.length !== 1
                     && !context.encounteredError
-                    && !(context.flags & 65536)) {
+                    && !(context.flags & 65536 /* AllowQualifedNameInPlaceOfIdentifier */)) {
                     context.encounteredError = true;
                 }
                 return createEntityNameFromSymbolChain(chain, chain.length - 1);
@@ -25991,13 +32551,13 @@ var ts;
                     var typeParameterNodes = lookupTypeParameterNodes(chain, index, context);
                     var symbol = chain[index];
                     if (index === 0) {
-                        context.flags |= 16777216;
+                        context.flags |= 16777216 /* InInitialEntityName */;
                     }
                     var symbolName = getNameOfSymbolAsWritten(symbol, context);
                     if (index === 0) {
-                        context.flags ^= 16777216;
+                        context.flags ^= 16777216 /* InInitialEntityName */;
                     }
-                    var identifier = ts.setEmitFlags(ts.createIdentifier(symbolName, typeParameterNodes), 16777216);
+                    var identifier = ts.setEmitFlags(ts.createIdentifier(symbolName, typeParameterNodes), 16777216 /* NoAsciiEscaping */);
                     identifier.symbol = symbol;
                     return index > 0 ? ts.createQualifiedName(createEntityNameFromSymbolChain(chain, index - 1), identifier) : identifier;
                 }
@@ -26009,34 +32569,34 @@ var ts;
                     var typeParameterNodes = lookupTypeParameterNodes(chain, index, context);
                     var symbol = chain[index];
                     if (index === 0) {
-                        context.flags |= 16777216;
+                        context.flags |= 16777216 /* InInitialEntityName */;
                     }
                     var symbolName = getNameOfSymbolAsWritten(symbol, context);
                     if (index === 0) {
-                        context.flags ^= 16777216;
+                        context.flags ^= 16777216 /* InInitialEntityName */;
                     }
                     var firstChar = symbolName.charCodeAt(0);
                     var canUsePropertyAccess = ts.isIdentifierStart(firstChar, languageVersion);
                     if (index === 0 || canUsePropertyAccess) {
-                        var identifier = ts.setEmitFlags(ts.createIdentifier(symbolName, typeParameterNodes), 16777216);
+                        var identifier = ts.setEmitFlags(ts.createIdentifier(symbolName, typeParameterNodes), 16777216 /* NoAsciiEscaping */);
                         identifier.symbol = symbol;
                         return index > 0 ? ts.createPropertyAccess(createExpressionFromSymbolChain(chain, index - 1), identifier) : identifier;
                     }
                     else {
-                        if (firstChar === 91) {
+                        if (firstChar === 91 /* openBracket */) {
                             symbolName = symbolName.substring(1, symbolName.length - 1);
                             firstChar = symbolName.charCodeAt(0);
                         }
                         var expression = void 0;
                         if (ts.isSingleOrDoubleQuote(firstChar)) {
                             expression = ts.createLiteral(symbolName.substring(1, symbolName.length - 1).replace(/\\./g, function (s) { return s.substring(1); }));
-                            expression.singleQuote = firstChar === 39;
+                            expression.singleQuote = firstChar === 39 /* singleQuote */;
                         }
                         else if (("" + +symbolName) === symbolName) {
                             expression = ts.createLiteral(+symbolName);
                         }
                         if (!expression) {
-                            expression = ts.setEmitFlags(ts.createIdentifier(symbolName, typeParameterNodes), 16777216);
+                            expression = ts.setEmitFlags(ts.createIdentifier(symbolName, typeParameterNodes), 16777216 /* NoAsciiEscaping */);
                             expression.symbol = symbol;
                         }
                         return ts.createElementAccess(createExpressionFromSymbolChain(chain, index - 1), expression);
@@ -26045,13 +32605,13 @@ var ts;
             }
         }
         function typePredicateToString(typePredicate, enclosingDeclaration, flags, writer) {
-            if (flags === void 0) { flags = 16384; }
+            if (flags === void 0) { flags = 16384 /* UseAliasDefinedOutsideCurrentScope */; }
             return writer ? typePredicateToStringWorker(writer).getText() : ts.usingSingleLineStringWriter(typePredicateToStringWorker);
             function typePredicateToStringWorker(writer) {
-                var predicate = ts.createTypePredicateNode(typePredicate.kind === 1 ? ts.createIdentifier(typePredicate.parameterName) : ts.createThisTypeNode(), nodeBuilder.typeToTypeNode(typePredicate.type, enclosingDeclaration, toNodeBuilderFlags(flags) | 3112960 | 512));
+                var predicate = ts.createTypePredicateNode(typePredicate.kind === 1 /* Identifier */ ? ts.createIdentifier(typePredicate.parameterName) : ts.createThisTypeNode(), nodeBuilder.typeToTypeNode(typePredicate.type, enclosingDeclaration, toNodeBuilderFlags(flags) | 3112960 /* IgnoreErrors */ | 512 /* WriteTypeParametersInQualifiedName */));
                 var printer = ts.createPrinter({ removeComments: true });
                 var sourceFile = enclosingDeclaration && ts.getSourceFileOfNode(enclosingDeclaration);
-                printer.writeNode(4, predicate, sourceFile, writer);
+                printer.writeNode(4 /* Unspecified */, predicate, /*sourceFile*/ sourceFile, writer);
                 return writer;
             }
         }
@@ -26061,10 +32621,10 @@ var ts;
             for (var i = 0; i < types.length; i++) {
                 var t = types[i];
                 flags |= t.flags;
-                if (!(t.flags & 24576)) {
-                    if (t.flags & (256 | 512)) {
-                        var baseType = t.flags & 256 ? booleanType : getBaseTypeOfEnumLiteralType(t);
-                        if (baseType.flags & 262144) {
+                if (!(t.flags & 24576 /* Nullable */)) {
+                    if (t.flags & (256 /* BooleanLiteral */ | 512 /* EnumLiteral */)) {
+                        var baseType = t.flags & 256 /* BooleanLiteral */ ? booleanType : getBaseTypeOfEnumLiteralType(t);
+                        if (baseType.flags & 262144 /* Union */) {
                             var count = baseType.types.length;
                             if (i + count <= types.length && types[i + count - 1] === baseType.types[count - 1]) {
                                 result.push(baseType);
@@ -26076,25 +32636,25 @@ var ts;
                     result.push(t);
                 }
             }
-            if (flags & 16384)
+            if (flags & 16384 /* Null */)
                 result.push(nullType);
-            if (flags & 8192)
+            if (flags & 8192 /* Undefined */)
                 result.push(undefinedType);
             return result || types;
         }
         function visibilityToString(flags) {
-            if (flags === 8) {
+            if (flags === 8 /* Private */) {
                 return "private";
             }
-            if (flags === 16) {
+            if (flags === 16 /* Protected */) {
                 return "protected";
             }
             return "public";
         }
         function getTypeAliasForTypeLiteral(type) {
-            if (type.symbol && type.symbol.flags & 2048) {
-                var node = ts.findAncestor(type.symbol.declarations[0].parent, function (n) { return n.kind !== 173; });
-                if (node.kind === 237) {
+            if (type.symbol && type.symbol.flags & 2048 /* TypeLiteral */) {
+                var node = ts.findAncestor(type.symbol.declarations[0].parent, function (n) { return n.kind !== 173 /* ParenthesizedType */; });
+                if (node.kind === 237 /* TypeAliasDeclaration */) {
                     return getSymbolOfNode(node);
                 }
             }
@@ -26102,35 +32662,47 @@ var ts;
         }
         function isTopLevelInExternalModuleAugmentation(node) {
             return node && node.parent &&
-                node.parent.kind === 240 &&
+                node.parent.kind === 240 /* ModuleBlock */ &&
                 ts.isExternalModuleAugmentation(node.parent.parent);
         }
         function isDefaultBindingContext(location) {
-            return location.kind === 274 || ts.isAmbientModule(location);
+            return location.kind === 274 /* SourceFile */ || ts.isAmbientModule(location);
         }
+        /**
+         * Gets a human-readable name for a symbol.
+         * Should *not* be used for the right-hand side of a `.` -- use `symbolName(symbol)` for that instead.
+         *
+         * Unlike `symbolName(symbol)`, this will include quotes if the name is from a string literal.
+         * It will also use a representation of a number as written instead of a decimal form, e.g. `0o11` instead of `9`.
+         */
         function getNameOfSymbolAsWritten(symbol, context) {
-            if (context && symbol.escapedName === "default" && !(context.flags & 16384) &&
-                (!(context.flags & 16777216) ||
+            if (context && symbol.escapedName === "default" /* Default */ && !(context.flags & 16384 /* UseAliasDefinedOutsideCurrentScope */) &&
+                // If it's not the first part of an entity name, it must print as `default`
+                (!(context.flags & 16777216 /* InInitialEntityName */) ||
+                    // if the symbol is synthesized, it will only be referenced externally it must print as `default`
                     !symbol.declarations ||
+                    // if not in the same binding context (source file, module declaration), it must print as `default`
                     (context.enclosingDeclaration && ts.findAncestor(symbol.declarations[0], isDefaultBindingContext) !== ts.findAncestor(context.enclosingDeclaration, isDefaultBindingContext)))) {
                 return "default";
             }
             if (symbol.declarations && symbol.declarations.length) {
-                if (ts.some(symbol.declarations, hasExternalModuleSymbol) && context.enclosingDeclaration) {
-                    var file = ts.getDeclarationOfKind(symbol, 274);
+                if (ts.some(symbol.declarations, hasExternalModuleSymbol) && context.enclosingDeclaration) { // TODO: GH#18217
+                    var file = ts.getDeclarationOfKind(symbol, 274 /* SourceFile */);
                     if (!file || !context.tracker.moduleResolverHost) {
                         if (context.tracker.trackReferencedAmbientModule) {
                             var ambientDecls = ts.filter(symbol.declarations, ts.isAmbientModule);
                             if (ts.length(ambientDecls)) {
                                 for (var _i = 0, ambientDecls_1 = ambientDecls; _i < ambientDecls_1.length; _i++) {
                                     var decl = ambientDecls_1[_i];
-                                    context.tracker.trackReferencedAmbientModule(decl);
+                                    context.tracker.trackReferencedAmbientModule(decl); // TODO: GH#18217
                                 }
                             }
                         }
+                        // ambient module, just use declaration/symbol name (fallthrough)
                     }
                     else {
-                        return "\"" + ts.getResolvedExternalModuleName(context.tracker.moduleResolverHost, file, ts.getSourceFileOfNode(ts.getOriginalNode(context.enclosingDeclaration))) + "\"";
+                        var contextFile = ts.getSourceFileOfNode(ts.getOriginalNode(context.enclosingDeclaration));
+                        return "\"" + (file.moduleName || ts.moduleSpecifiers.getModuleSpecifier(compilerOptions, contextFile, contextFile.path, file.path, context.tracker.moduleResolverHost)) + "\"";
                     }
                 }
                 var declaration = symbol.declarations[0];
@@ -26138,26 +32710,26 @@ var ts;
                 if (name) {
                     return ts.declarationNameToString(name);
                 }
-                if (declaration.parent && declaration.parent.kind === 232) {
+                if (declaration.parent && declaration.parent.kind === 232 /* VariableDeclaration */) {
                     return ts.declarationNameToString(declaration.parent.name);
                 }
-                if (context && !context.encounteredError && !(context.flags & 131072)) {
+                if (context && !context.encounteredError && !(context.flags & 131072 /* AllowAnonymousIdentifier */)) {
                     context.encounteredError = true;
                 }
                 switch (declaration.kind) {
-                    case 205:
+                    case 205 /* ClassExpression */:
                         return "(Anonymous class)";
-                    case 192:
-                    case 193:
+                    case 192 /* FunctionExpression */:
+                    case 193 /* ArrowFunction */:
                         return "(Anonymous function)";
                 }
             }
             var nameType = symbol.nameType;
             if (nameType) {
-                if (nameType.flags & 64 && !ts.isIdentifierText(nameType.value, compilerOptions.target)) {
-                    return "\"" + ts.escapeString(nameType.value, 34) + "\"";
+                if (nameType.flags & 64 /* StringLiteral */ && !ts.isIdentifierText(nameType.value, compilerOptions.target)) {
+                    return "\"" + ts.escapeString(nameType.value, 34 /* doubleQuote */) + "\"";
                 }
-                if (nameType && nameType.flags & 2048) {
+                if (nameType && nameType.flags & 2048 /* UniqueESSymbol */) {
                     return "[" + getNameOfSymbolAsWritten(nameType.symbol, context) + "]";
                 }
             }
@@ -26174,66 +32746,81 @@ var ts;
             return false;
             function determineIfDeclarationIsVisible() {
                 switch (node.kind) {
-                    case 292:
-                    case 297:
+                    case 292 /* JSDocCallbackTag */:
+                    case 297 /* JSDocTypedefTag */:
+                        // Top-level jsdoc type aliases are considered exported
+                        // First parent is comment node, second is hosting declaration or token; we only care about those tokens or declarations whose parent is a source file
                         return !!(node.parent && node.parent.parent && node.parent.parent.parent && ts.isSourceFile(node.parent.parent.parent));
-                    case 182:
+                    case 182 /* BindingElement */:
                         return isDeclarationVisible(node.parent.parent);
-                    case 232:
+                    case 232 /* VariableDeclaration */:
                         if (ts.isBindingPattern(node.name) &&
                             !node.name.elements.length) {
+                            // If the binding pattern is empty, this variable declaration is not visible
                             return false;
                         }
-                    case 239:
-                    case 235:
-                    case 236:
-                    case 237:
-                    case 234:
-                    case 238:
-                    case 243:
+                    // falls through
+                    case 239 /* ModuleDeclaration */:
+                    case 235 /* ClassDeclaration */:
+                    case 236 /* InterfaceDeclaration */:
+                    case 237 /* TypeAliasDeclaration */:
+                    case 234 /* FunctionDeclaration */:
+                    case 238 /* EnumDeclaration */:
+                    case 243 /* ImportEqualsDeclaration */:
+                        // external module augmentation is always visible
                         if (ts.isExternalModuleAugmentation(node)) {
                             return true;
                         }
                         var parent = getDeclarationContainer(node);
-                        if (!(ts.getCombinedModifierFlags(node) & 1) &&
-                            !(node.kind !== 243 && parent.kind !== 274 && parent.flags & 4194304)) {
+                        // If the node is not exported or it is not ambient module element (except import declaration)
+                        if (!(ts.getCombinedModifierFlags(node) & 1 /* Export */) &&
+                            !(node.kind !== 243 /* ImportEqualsDeclaration */ && parent.kind !== 274 /* SourceFile */ && parent.flags & 4194304 /* Ambient */)) {
                             return isGlobalSourceFile(parent);
                         }
+                        // Exported members/ambient module elements (exception import declaration) are visible if parent is visible
                         return isDeclarationVisible(parent);
-                    case 152:
-                    case 151:
-                    case 156:
-                    case 157:
-                    case 154:
-                    case 153:
-                        if (ts.hasModifier(node, 8 | 16)) {
+                    case 152 /* PropertyDeclaration */:
+                    case 151 /* PropertySignature */:
+                    case 156 /* GetAccessor */:
+                    case 157 /* SetAccessor */:
+                    case 154 /* MethodDeclaration */:
+                    case 153 /* MethodSignature */:
+                        if (ts.hasModifier(node, 8 /* Private */ | 16 /* Protected */)) {
+                            // Private/protected properties/methods are not visible
                             return false;
                         }
-                    case 155:
-                    case 159:
-                    case 158:
-                    case 160:
-                    case 149:
-                    case 240:
-                    case 163:
-                    case 164:
-                    case 166:
-                    case 162:
-                    case 167:
-                    case 168:
-                    case 169:
-                    case 170:
-                    case 173:
+                    // Public properties/methods are visible if its parents are visible, so:
+                    // falls through
+                    case 155 /* Constructor */:
+                    case 159 /* ConstructSignature */:
+                    case 158 /* CallSignature */:
+                    case 160 /* IndexSignature */:
+                    case 149 /* Parameter */:
+                    case 240 /* ModuleBlock */:
+                    case 163 /* FunctionType */:
+                    case 164 /* ConstructorType */:
+                    case 166 /* TypeLiteral */:
+                    case 162 /* TypeReference */:
+                    case 167 /* ArrayType */:
+                    case 168 /* TupleType */:
+                    case 169 /* UnionType */:
+                    case 170 /* IntersectionType */:
+                    case 173 /* ParenthesizedType */:
                         return isDeclarationVisible(node.parent);
-                    case 245:
-                    case 246:
-                    case 248:
+                    // Default binding, import specifier and namespace import is visible
+                    // only on demand so by default it is not visible
+                    case 245 /* ImportClause */:
+                    case 246 /* NamespaceImport */:
+                    case 248 /* ImportSpecifier */:
                         return false;
-                    case 148:
-                    case 274:
-                    case 242:
+                    // Type parameters are always visible
+                    case 148 /* TypeParameter */:
+                    // Source file and namespace export are always visible
+                    case 274 /* SourceFile */:
+                    case 242 /* NamespaceExportDeclaration */:
                         return true;
-                    case 249:
+                    // Export assignments do not create name bindings outside the module
+                    case 249 /* ExportAssignment */:
                         return false;
                     default:
                         return false;
@@ -26242,11 +32829,11 @@ var ts;
         }
         function collectLinkedAliases(node, setVisibility) {
             var exportSymbol;
-            if (node.parent && node.parent.kind === 249) {
-                exportSymbol = resolveName(node, node.escapedText, 67216319 | 67901928 | 1920 | 2097152, undefined, node, false);
+            if (node.parent && node.parent.kind === 249 /* ExportAssignment */) {
+                exportSymbol = resolveName(node, node.escapedText, 67216319 /* Value */ | 67901928 /* Type */ | 1920 /* Namespace */ | 2097152 /* Alias */, /*nameNotFoundMessage*/ undefined, node, /*isUse*/ false);
             }
-            else if (node.parent.kind === 252) {
-                exportSymbol = getTargetOfExportSpecifier(node.parent, 67216319 | 67901928 | 1920 | 2097152);
+            else if (node.parent.kind === 252 /* ExportSpecifier */) {
+                exportSymbol = getTargetOfExportSpecifier(node.parent, 67216319 /* Value */ | 67901928 /* Type */ | 1920 /* Namespace */ | 2097152 /* Alias */);
             }
             var result;
             if (exportSymbol) {
@@ -26264,9 +32851,10 @@ var ts;
                         ts.pushIfUnique(result, resultNode);
                     }
                     if (ts.isInternalModuleImportEqualsDeclaration(declaration)) {
+                        // Add the referenced top container visible
                         var internalModuleReference = declaration.moduleReference;
                         var firstIdentifier = getFirstIdentifier(internalModuleReference);
-                        var importSymbol = resolveName(declaration, firstIdentifier.escapedText, 67216319 | 67901928 | 1920, undefined, undefined, false);
+                        var importSymbol = resolveName(declaration, firstIdentifier.escapedText, 67216319 /* Value */ | 67901928 /* Type */ | 1920 /* Namespace */, undefined, undefined, /*isUse*/ false);
                         if (importSymbol) {
                             buildVisibleNodeList(importSymbol.declarations);
                         }
@@ -26274,9 +32862,21 @@ var ts;
                 });
             }
         }
+        /**
+         * Push an entry on the type resolution stack. If an entry with the given target and the given property name
+         * is already on the stack, and no entries in between already have a type, then a circularity has occurred.
+         * In this case, the result values of the existing entry and all entries pushed after it are changed to false,
+         * and the value false is returned. Otherwise, the new entry is just pushed onto the stack, and true is returned.
+         * In order to see if the same query has already been done before, the target object and the propertyName both
+         * must match the one passed in.
+         *
+         * @param target The symbol, type, or signature whose type is being queried
+         * @param propertyName The property name that should be used to query the target for its type
+         */
         function pushTypeResolution(target, propertyName) {
             var resolutionCycleStartIndex = findResolutionCycleStartIndex(target, propertyName);
             if (resolutionCycleStartIndex >= 0) {
+                // A cycle was found
                 var length_2 = resolutionTargets.length;
                 for (var i = resolutionCycleStartIndex; i < length_2; i++) {
                     resolutionResults[i] = false;
@@ -26284,7 +32884,7 @@ var ts;
                 return false;
             }
             resolutionTargets.push(target);
-            resolutionResults.push(true);
+            resolutionResults.push(/*items*/ true);
             resolutionPropertyNames.push(propertyName);
             return true;
         }
@@ -26300,24 +32900,26 @@ var ts;
             return -1;
         }
         function hasType(target, propertyName) {
-            if (propertyName === 0) {
+            if (propertyName === 0 /* Type */) {
                 return !!getSymbolLinks(target).type;
             }
-            if (propertyName === 2) {
+            if (propertyName === 2 /* DeclaredType */) {
                 return !!getSymbolLinks(target).declaredType;
             }
-            if (propertyName === 1) {
+            if (propertyName === 1 /* ResolvedBaseConstructorType */) {
                 return !!target.resolvedBaseConstructorType;
             }
-            if (propertyName === 3) {
+            if (propertyName === 3 /* ResolvedReturnType */) {
                 return !!target.resolvedReturnType;
             }
-            if (propertyName === 4) {
+            if (propertyName === 4 /* ResolvedBaseConstraint */) {
                 var bc = target.resolvedBaseConstraint;
                 return !!bc && bc !== circularConstraintType;
             }
             return ts.Debug.fail("Unhandled TypeSystemPropertyName " + propertyName);
         }
+        // Pop an entry from the type resolution stack and return its associated result value. The result value will
+        // be true if no circularities were detected, or false if a circularity was found.
         function popTypeResolution() {
             resolutionTargets.pop();
             resolutionPropertyNames.pop();
@@ -26326,12 +32928,12 @@ var ts;
         function getDeclarationContainer(node) {
             return ts.findAncestor(ts.getRootDeclaration(node), function (node) {
                 switch (node.kind) {
-                    case 232:
-                    case 233:
-                    case 248:
-                    case 247:
-                    case 246:
-                    case 245:
+                    case 232 /* VariableDeclaration */:
+                    case 233 /* VariableDeclarationList */:
+                    case 248 /* ImportSpecifier */:
+                    case 247 /* NamedImports */:
+                    case 246 /* NamespaceImport */:
+                    case 245 /* ImportClause */:
                         return false;
                     default:
                         return true;
@@ -26339,29 +32941,36 @@ var ts;
             }).parent;
         }
         function getTypeOfPrototypeProperty(prototype) {
+            // TypeScript 1.0 spec (April 2014): 8.4
+            // Every class automatically contains a static property member named 'prototype',
+            // the type of which is an instantiation of the class type with type Any supplied as a type argument for each type parameter.
+            // It is an error to explicitly declare a static property member with the name 'prototype'.
             var classType = getDeclaredTypeOfSymbol(getParentOfSymbol(prototype));
             return classType.typeParameters ? createTypeReference(classType, ts.map(classType.typeParameters, function (_) { return anyType; })) : classType;
         }
+        // Return the type of the given property in the given type, or undefined if no such property exists
         function getTypeOfPropertyOfType(type, name) {
             var prop = getPropertyOfType(type, name);
             return prop ? getTypeOfSymbol(prop) : undefined;
         }
         function isTypeAny(type) {
-            return type && (type.flags & 1) !== 0;
+            return type && (type.flags & 1 /* Any */) !== 0;
         }
+        // Return the type of a binding element parent. We check SymbolLinks first to see if a type has been
+        // assigned by contextual typing.
         function getTypeForBindingElementParent(node) {
             var symbol = getSymbolOfNode(node);
-            return symbol && getSymbolLinks(symbol).type || getTypeForVariableLikeDeclaration(node, false);
+            return symbol && getSymbolLinks(symbol).type || getTypeForVariableLikeDeclaration(node, /*includeOptionality*/ false);
         }
         function isComputedNonLiteralName(name) {
-            return name.kind === 147 && !ts.isStringOrNumericLiteral(name.expression);
+            return name.kind === 147 /* ComputedPropertyName */ && !ts.isStringOrNumericLiteral(name.expression);
         }
         function getRestType(source, properties, symbol) {
-            source = filterType(source, function (t) { return !(t.flags & 24576); });
-            if (source.flags & 32768) {
+            source = filterType(source, function (t) { return !(t.flags & 24576 /* Nullable */); });
+            if (source.flags & 32768 /* Never */) {
                 return emptyObjectType;
             }
-            if (source.flags & 262144) {
+            if (source.flags & 262144 /* Union */) {
                 return mapType(source, function (t) { return getRestType(t, properties, symbol); });
             }
             var members = ts.createSymbolTable();
@@ -26373,22 +32982,27 @@ var ts;
             for (var _a = 0, _b = getPropertiesOfType(source); _a < _b.length; _a++) {
                 var prop = _b[_a];
                 var inNamesToRemove = names.has(prop.escapedName);
-                var isPrivate = ts.getDeclarationModifierFlagsFromSymbol(prop) & (8 | 16);
-                var isSetOnlyAccessor = prop.flags & 65536 && !(prop.flags & 32768);
+                var isPrivate = ts.getDeclarationModifierFlagsFromSymbol(prop) & (8 /* Private */ | 16 /* Protected */);
+                var isSetOnlyAccessor = prop.flags & 65536 /* SetAccessor */ && !(prop.flags & 32768 /* GetAccessor */);
                 if (!inNamesToRemove && !isPrivate && !isClassMethod(prop) && !isSetOnlyAccessor) {
                     members.set(prop.escapedName, getNonReadonlySymbol(prop));
                 }
             }
-            var stringIndexInfo = getIndexInfoOfType(source, 0);
-            var numberIndexInfo = getIndexInfoOfType(source, 1);
+            var stringIndexInfo = getIndexInfoOfType(source, 0 /* String */);
+            var numberIndexInfo = getIndexInfoOfType(source, 1 /* Number */);
             return createAnonymousType(symbol, members, ts.emptyArray, ts.emptyArray, stringIndexInfo, numberIndexInfo);
         }
+        /** Return the inferred type for a binding element */
         function getTypeForBindingElement(declaration) {
             var pattern = declaration.parent;
             var parentType = getTypeForBindingElementParent(pattern.parent);
+            // If parent has the unknown (error) type, then so does this binding element
             if (parentType === errorType) {
                 return errorType;
             }
+            // If no type was specified or inferred for parent,
+            // infer from the initializer of the binding element if one is present.
+            // Otherwise, go with the undefined type of the parent.
             if (!parentType) {
                 return declaration.initializer ? checkDeclarationInitializer(declaration) : parentType;
             }
@@ -26396,9 +33010,9 @@ var ts;
                 return parentType;
             }
             var type;
-            if (pattern.kind === 180) {
+            if (pattern.kind === 180 /* ObjectBindingPattern */) {
                 if (declaration.dotDotDotToken) {
-                    if (parentType.flags & 2 || !isValidSpreadType(parentType)) {
+                    if (parentType.flags & 2 /* Unknown */ || !isValidSpreadType(parentType)) {
                         error(declaration, ts.Diagnostics.Rest_types_may_only_be_created_from_object_types);
                         return errorType;
                     }
@@ -26412,20 +33026,21 @@ var ts;
                     type = getRestType(parentType, literalMembers, declaration.symbol);
                 }
                 else {
+                    // Use explicitly specified property name ({ p: xxx } form), or otherwise the implied name ({ p } form)
                     var name = declaration.propertyName || declaration.name;
                     var isLate = isLateBindableName(name);
                     var isWellKnown = ts.isComputedPropertyName(name) && ts.isWellKnownSymbolSyntactically(name.expression);
                     if (!isLate && !isWellKnown && isComputedNonLiteralName(name)) {
                         var exprType = checkExpression(name.expression);
-                        if (isTypeAssignableToKind(exprType, 3072)) {
+                        if (isTypeAssignableToKind(exprType, 3072 /* ESSymbolLike */)) {
                             if (noImplicitAny) {
                                 error(declaration, ts.Diagnostics.Type_0_cannot_be_used_to_index_type_1, typeToString(exprType), typeToString(parentType));
                             }
                             return anyType;
                         }
-                        var indexerType = isTypeAssignableToKind(exprType, 168) && getIndexTypeOfType(parentType, 1) || getIndexTypeOfType(parentType, 0);
+                        var indexerType = isTypeAssignableToKind(exprType, 168 /* NumberLike */) && getIndexTypeOfType(parentType, 1 /* Number */) || getIndexTypeOfType(parentType, 0 /* String */);
                         if (!indexerType && noImplicitAny && !compilerOptions.suppressImplicitAnyIndexErrors) {
-                            if (getIndexTypeOfType(parentType, 1)) {
+                            if (getIndexTypeOfType(parentType, 1 /* Number */)) {
                                 error(declaration, ts.Diagnostics.Element_implicitly_has_an_any_type_because_index_expression_is_not_of_type_number);
                             }
                             else {
@@ -26434,14 +33049,17 @@ var ts;
                         }
                         return indexerType || anyType;
                     }
+                    // Use type of the specified property, or otherwise, for a numeric name, the type of the numeric index signature,
+                    // or otherwise the type of the string index signature.
                     var nameType = isLate ? checkComputedPropertyName(name) : undefined;
                     var text = isLate ? getLateBoundNameFromType(nameType) :
                         isWellKnown ? ts.getPropertyNameForKnownSymbolName(ts.idText(name.expression.name)) :
                             ts.getTextOfPropertyName(name);
-                    if (strictNullChecks && declaration.flags & 4194304 && ts.isParameterDeclaration(declaration)) {
+                    // Relax null check on ambient destructuring parameters, since the parameters have no implementation and are just documentation
+                    if (strictNullChecks && declaration.flags & 4194304 /* Ambient */ && ts.isParameterDeclaration(declaration)) {
                         parentType = getNonNullableType(parentType);
                     }
-                    if (isLate && nameType && !getPropertyOfType(parentType, text) && isTypeAssignableToKind(nameType, 3072)) {
+                    if (isLate && nameType && !getPropertyOfType(parentType, text) && isTypeAssignableToKind(nameType, 3072 /* ESSymbolLike */)) {
                         if (noImplicitAny) {
                             error(declaration, ts.Diagnostics.Type_0_cannot_be_used_to_index_type_1, typeToString(nameType), typeToString(parentType));
                         }
@@ -26449,8 +33067,8 @@ var ts;
                     }
                     var declaredType = getConstraintForLocation(getTypeOfPropertyOfType(parentType, text), declaration.name);
                     type = declaredType && getFlowTypeOfReference(declaration, declaredType) ||
-                        isNumericLiteralName(text) && getIndexTypeOfType(parentType, 1) ||
-                        getIndexTypeOfType(parentType, 0);
+                        isNumericLiteralName(text) && getIndexTypeOfType(parentType, 1 /* Number */) ||
+                        getIndexTypeOfType(parentType, 0 /* String */);
                     if (!type) {
                         error(name, ts.Diagnostics.Type_0_has_no_property_1_and_no_string_index_signature, typeToString(parentType), ts.declarationNameToString(name));
                         return errorType;
@@ -26458,11 +33076,16 @@ var ts;
                 }
             }
             else {
-                var elementType = checkIteratedTypeOrElementType(parentType, pattern, false, false);
+                // This elementType will be used if the specific property corresponding to this index is not
+                // present (aka the tuple element property). This call also checks that the parentType is in
+                // fact an iterable or array (depending on target language).
+                var elementType = checkIteratedTypeOrElementType(parentType, pattern, /*allowStringInput*/ false, /*allowAsyncIterables*/ false);
                 if (declaration.dotDotDotToken) {
+                    // Rest element has an array type with the same element type as the parent type
                     type = createArrayType(elementType);
                 }
                 else {
+                    // Use specific property type when parent is a tuple or numeric index type when parent is an array
                     var propName = "" + pattern.elements.indexOf(declaration);
                     type = isTupleLikeType(parentType)
                         ? getTypeOfPropertyOfType(parentType, propName)
@@ -26478,11 +33101,13 @@ var ts;
                     }
                 }
             }
-            if (strictNullChecks && declaration.initializer && !(getFalsyFlags(checkExpressionCached(declaration.initializer)) & 8192)) {
-                type = getTypeWithFacts(type, 131072);
+            // In strict null checking mode, if a default value of a non-undefined type is specified, remove
+            // undefined from the final type.
+            if (strictNullChecks && declaration.initializer && !(getFalsyFlags(checkExpressionCached(declaration.initializer)) & 8192 /* Undefined */)) {
+                type = getTypeWithFacts(type, 131072 /* NEUndefined */);
             }
             return declaration.initializer ?
-                getUnionType([type, checkExpressionCached(declaration.initializer)], 2) :
+                getUnionType([type, checkExpressionCached(declaration.initializer)], 2 /* Subtype */) :
                 type;
         }
         function getTypeForDeclarationFromJSDocComment(declaration) {
@@ -26494,22 +33119,29 @@ var ts;
         }
         function isNullOrUndefined(node) {
             var expr = ts.skipParentheses(node);
-            return expr.kind === 95 || expr.kind === 71 && getResolvedSymbol(expr) === undefinedSymbol;
+            return expr.kind === 95 /* NullKeyword */ || expr.kind === 71 /* Identifier */ && getResolvedSymbol(expr) === undefinedSymbol;
         }
         function isEmptyArrayLiteral(node) {
             var expr = ts.skipParentheses(node);
-            return expr.kind === 183 && expr.elements.length === 0;
+            return expr.kind === 183 /* ArrayLiteralExpression */ && expr.elements.length === 0;
         }
         function addOptionality(type, optional) {
             if (optional === void 0) { optional = true; }
             return strictNullChecks && optional ? getOptionalType(type) : type;
         }
+        // Return the inferred type for a variable, parameter, or property declaration
         function getTypeForVariableLikeDeclaration(declaration, includeOptionality) {
-            if (ts.isVariableDeclaration(declaration) && declaration.parent.parent.kind === 221) {
+            // A variable declared in a for..in statement is of type string, or of type keyof T when the
+            // right hand expression is of a type parameter type.
+            if (ts.isVariableDeclaration(declaration) && declaration.parent.parent.kind === 221 /* ForInStatement */) {
                 var indexType = getIndexType(checkNonNullExpression(declaration.parent.parent.expression));
-                return indexType.flags & (65536 | 1048576) ? getExtractStringType(indexType) : stringType;
+                return indexType.flags & (65536 /* TypeParameter */ | 1048576 /* Index */) ? getExtractStringType(indexType) : stringType;
             }
-            if (ts.isVariableDeclaration(declaration) && declaration.parent.parent.kind === 222) {
+            if (ts.isVariableDeclaration(declaration) && declaration.parent.parent.kind === 222 /* ForOfStatement */) {
+                // checkRightHandSideOfForOf will return undefined if the for-of expression type was
+                // missing properties/signatures required to get its iteratedType (like
+                // [Symbol.iterator] or next). This may be because we accessed properties from anyType,
+                // or it may have led to an error inside getElementTypeOfIterable.
                 var forOfStatement = declaration.parent.parent;
                 return checkRightHandSideOfForOf(forOfStatement.expression, forOfStatement.awaitModifier) || anyType;
             }
@@ -26518,34 +33150,43 @@ var ts;
             }
             var isOptional = includeOptionality && (ts.isParameter(declaration) && isJSDocOptionalParameter(declaration)
                 || !ts.isBindingElement(declaration) && !ts.isVariableDeclaration(declaration) && !!declaration.questionToken);
+            // Use type from type annotation if one is present
             var declaredType = tryGetTypeFromEffectiveTypeNode(declaration);
             if (declaredType) {
                 return addOptionality(declaredType, isOptional);
             }
             if ((noImplicitAny || ts.isInJavaScriptFile(declaration)) &&
-                declaration.kind === 232 && !ts.isBindingPattern(declaration.name) &&
-                !(ts.getCombinedModifierFlags(declaration) & 1) && !(declaration.flags & 4194304)) {
-                if (!(ts.getCombinedNodeFlags(declaration) & 2) && (!declaration.initializer || isNullOrUndefined(declaration.initializer))) {
+                declaration.kind === 232 /* VariableDeclaration */ && !ts.isBindingPattern(declaration.name) &&
+                !(ts.getCombinedModifierFlags(declaration) & 1 /* Export */) && !(declaration.flags & 4194304 /* Ambient */)) {
+                // If --noImplicitAny is on or the declaration is in a Javascript file,
+                // use control flow tracked 'any' type for non-ambient, non-exported var or let variables with no
+                // initializer or a 'null' or 'undefined' initializer.
+                if (!(ts.getCombinedNodeFlags(declaration) & 2 /* Const */) && (!declaration.initializer || isNullOrUndefined(declaration.initializer))) {
                     return autoType;
                 }
+                // Use control flow tracked 'any[]' type for non-ambient, non-exported variables with an empty array
+                // literal initializer.
                 if (declaration.initializer && isEmptyArrayLiteral(declaration.initializer)) {
                     return autoArrayType;
                 }
             }
-            if (declaration.kind === 149) {
+            if (declaration.kind === 149 /* Parameter */) {
                 var func = declaration.parent;
-                if (func.kind === 157 && !hasNonBindableDynamicName(func)) {
-                    var getter = ts.getDeclarationOfKind(getSymbolOfNode(declaration.parent), 156);
+                // For a parameter of a set accessor, use the type of the get accessor if one is present
+                if (func.kind === 157 /* SetAccessor */ && !hasNonBindableDynamicName(func)) {
+                    var getter = ts.getDeclarationOfKind(getSymbolOfNode(declaration.parent), 156 /* GetAccessor */);
                     if (getter) {
                         var getterSignature = getSignatureFromDeclaration(getter);
                         var thisParameter = getAccessorThisParameter(func);
                         if (thisParameter && declaration === thisParameter) {
+                            // Use the type from the *getter*
                             ts.Debug.assert(!thisParameter.type);
                             return getTypeOfSymbol(getterSignature.thisParameter);
                         }
                         return getReturnTypeOfSignature(getterSignature);
                     }
                 }
+                // Use contextual parameter type if one is available
                 var type = void 0;
                 if (declaration.symbol.escapedName === "this") {
                     type = getContextualThisParameterType(func);
@@ -26557,19 +33198,25 @@ var ts;
                     return addOptionality(type, isOptional);
                 }
             }
+            // Use the type of the initializer expression if one is present
             if (declaration.initializer) {
                 var type = checkDeclarationInitializer(declaration);
                 return addOptionality(type, isOptional);
             }
             if (ts.isJsxAttribute(declaration)) {
+                // if JSX attribute doesn't have initializer, by default the attribute will have boolean value of true.
+                // I.e <Elem attr /> is sugar for <Elem attr={true} />
                 return trueType;
             }
+            // If the declaration specifies a binding pattern, use the type implied by the binding pattern
             if (ts.isBindingPattern(declaration.name)) {
-                return getTypeFromBindingPattern(declaration.name, false, true);
+                return getTypeFromBindingPattern(declaration.name, /*includePatternInType*/ false, /*reportErrors*/ true);
             }
+            // No type specified and nothing can be inferred
             return undefined;
         }
         function getWidenedTypeFromJSSpecialPropertyDeclarations(symbol) {
+            // function/class/{} assignments are fresh declarations, not property assignments, so only add prototype assignments
             var specialDeclaration = ts.getAssignedJavascriptInitializer(symbol.valueDeclaration);
             if (specialDeclaration) {
                 return getWidenedLiteralType(checkExpressionCached(specialDeclaration));
@@ -26579,20 +33226,22 @@ var ts;
             var definedInConstructor = false;
             var definedInMethod = false;
             var jsDocType;
-            var _loop_3 = function (declaration) {
+            var _loop_1 = function (declaration) {
                 var declarationInConstructor = false;
-                var expression = declaration.kind === 200 ? declaration :
-                    declaration.kind === 185 ? ts.cast(declaration.parent, ts.isBinaryExpression) :
+                var expression = declaration.kind === 200 /* BinaryExpression */ ? declaration :
+                    declaration.kind === 185 /* PropertyAccessExpression */ ? ts.cast(declaration.parent, ts.isBinaryExpression) :
                         undefined;
                 if (!expression) {
                     return { value: errorType };
                 }
                 var special = ts.getSpecialPropertyAssignmentKind(expression);
-                if (special === 4) {
-                    var thisContainer = ts.getThisContainer(expression, false);
-                    declarationInConstructor = thisContainer.kind === 155 ||
-                        thisContainer.kind === 234 ||
-                        (thisContainer.kind === 192 && !ts.isPrototypePropertyAssignment(thisContainer.parent));
+                if (special === 4 /* ThisProperty */) {
+                    var thisContainer = ts.getThisContainer(expression, /*includeArrowFunctions*/ false);
+                    // Properties defined in a constructor (or base constructor, or javascript constructor function) don't get undefined added.
+                    // Function expressions that are assigned to the prototype count as methods.
+                    declarationInConstructor = thisContainer.kind === 155 /* Constructor */ ||
+                        thisContainer.kind === 234 /* FunctionDeclaration */ ||
+                        (thisContainer.kind === 192 /* FunctionExpression */ && !ts.isPrototypePropertyAssignment(thisContainer.parent));
                     if (declarationInConstructor) {
                         definedInConstructor = true;
                     }
@@ -26600,6 +33249,7 @@ var ts;
                         definedInMethod = true;
                     }
                 }
+                // If there is a JSDoc type, use it
                 var type_1 = getTypeForDeclarationFromJSDocComment(expression.parent);
                 if (type_1) {
                     var declarationType = getWidenedType(type_1);
@@ -26608,30 +33258,31 @@ var ts;
                     }
                     else if (jsDocType !== errorType && declarationType !== errorType &&
                         !isTypeIdenticalTo(jsDocType, declarationType) &&
-                        !(symbol.flags & 67108864)) {
+                        !(symbol.flags & 67108864 /* JSContainer */)) {
                         errorNextVariableOrPropertyDeclarationMustHaveSameType(jsDocType, declaration, declarationType);
                     }
                 }
                 else if (!jsDocType) {
+                    // If we don't have an explicit JSDoc type, get the type from the expression.
                     var type_2 = getWidenedLiteralType(checkExpressionCached(expression.right));
-                    if (ts.getObjectFlags(type_2) & 16 &&
-                        special === 2 &&
-                        symbol.escapedName === "export=") {
+                    if (ts.getObjectFlags(type_2) & 16 /* Anonymous */ &&
+                        special === 2 /* ModuleExports */ &&
+                        symbol.escapedName === "export=" /* ExportEquals */) {
                         var exportedType_1 = resolveStructuredTypeMembers(type_2);
-                        var members_3 = ts.createSymbolTable();
-                        ts.copyEntries(exportedType_1.members, members_3);
+                        var members_2 = ts.createSymbolTable();
+                        ts.copyEntries(exportedType_1.members, members_2);
                         symbol.exports.forEach(function (s, name) {
-                            if (members_3.has(name)) {
+                            if (members_2.has(name)) {
                                 var exportedMember = exportedType_1.members.get(name);
                                 var union = createSymbol(s.flags | exportedMember.flags, name);
                                 union.type = getUnionType([getTypeOfSymbol(s), getTypeOfSymbol(exportedMember)]);
-                                members_3.set(name, union);
+                                members_2.set(name, union);
                             }
                             else {
-                                members_3.set(name, s);
+                                members_2.set(name, s);
                             }
                         });
-                        type_2 = createAnonymousType(exportedType_1.symbol, members_3, exportedType_1.callSignatures, exportedType_1.constructSignatures, exportedType_1.stringIndexInfo, exportedType_1.numberIndexInfo);
+                        type_2 = createAnonymousType(exportedType_1.symbol, members_2, exportedType_1.callSignatures, exportedType_1.constructSignatures, exportedType_1.stringIndexInfo, exportedType_1.numberIndexInfo);
                     }
                     var anyedType = type_2;
                     if (isEmptyArrayLiteralType(type_2)) {
@@ -26648,12 +33299,13 @@ var ts;
             };
             for (var _i = 0, _a = symbol.declarations; _i < _a.length; _i++) {
                 var declaration = _a[_i];
-                var state_2 = _loop_3(declaration);
+                var state_2 = _loop_1(declaration);
                 if (typeof state_2 === "object")
                     return state_2.value;
             }
             var type = jsDocType;
             if (!type) {
+                // use only the constructor types unless they were only assigned null | undefined (including widening variants)
                 if (definedInMethod) {
                     var propType = getTypeOfSpecialPropertyOfBaseType(symbol);
                     if (propType) {
@@ -26661,11 +33313,11 @@ var ts;
                         definedInConstructor = true;
                     }
                 }
-                var sourceTypes = ts.some(constructorTypes, function (t) { return !!(t.flags & ~(24576 | 134217728)); }) ? constructorTypes : types;
-                type = getUnionType(sourceTypes, 2);
+                var sourceTypes = ts.some(constructorTypes, function (t) { return !!(t.flags & ~(24576 /* Nullable */ | 134217728 /* ContainsWideningType */)); }) ? constructorTypes : types; // TODO: GH#18217
+                type = getUnionType(sourceTypes, 2 /* Subtype */);
             }
             var widened = getWidenedType(addOptionality(type, definedInMethod && !definedInConstructor));
-            if (filterType(widened, function (t) { return !!(t.flags & ~24576); }) === neverType) {
+            if (filterType(widened, function (t) { return !!(t.flags & ~24576 /* Nullable */); }) === neverType) {
                 if (noImplicitAny) {
                     reportImplicitAnyError(symbol.valueDeclaration, anyType);
                 }
@@ -26673,9 +33325,10 @@ var ts;
             }
             return widened;
         }
+        /** check for definition in base class if any declaration is in a class */
         function getTypeOfSpecialPropertyOfBaseType(specialProperty) {
             var parentDeclaration = ts.forEach(specialProperty.declarations, function (d) {
-                var parent = ts.getThisContainer(d, false).parent;
+                var parent = ts.getThisContainer(d, /*includeArrowFunctions*/ false).parent;
                 return ts.isClassLike(parent) && parent;
             });
             if (parentDeclaration) {
@@ -26686,6 +33339,9 @@ var ts;
                 }
             }
         }
+        // Return the type implied by a binding pattern element. This is the type of the initializer of the element if
+        // one is present. Otherwise, if the element is itself a binding pattern, it is the type implied by the binding
+        // pattern. Otherwise, it is the type any.
         function getTypeFromBindingElement(element, includePatternInType, reportErrors) {
             if (element.initializer) {
                 return checkDeclarationInitializer(element);
@@ -26698,41 +33354,45 @@ var ts;
             }
             return anyType;
         }
+        // Return the type implied by an object binding pattern
         function getTypeFromObjectBindingPattern(pattern, includePatternInType, reportErrors) {
             var members = ts.createSymbolTable();
             var stringIndexInfo;
-            var objectFlags = 128;
+            var objectFlags = 128 /* ObjectLiteral */;
             ts.forEach(pattern.elements, function (e) {
                 var name = e.propertyName || e.name;
                 if (isComputedNonLiteralName(name)) {
-                    objectFlags |= 512;
+                    // do not include computed properties in the implied type
+                    objectFlags |= 512 /* ObjectLiteralPatternWithComputedProperties */;
                     return;
                 }
                 if (e.dotDotDotToken) {
-                    stringIndexInfo = createIndexInfo(anyType, false);
+                    stringIndexInfo = createIndexInfo(anyType, /*isReadonly*/ false);
                     return;
                 }
                 var text = ts.getTextOfPropertyName(name);
-                var flags = 4 | (e.initializer ? 16777216 : 0);
+                var flags = 4 /* Property */ | (e.initializer ? 16777216 /* Optional */ : 0);
                 var symbol = createSymbol(flags, text);
                 symbol.type = getTypeFromBindingElement(e, includePatternInType, reportErrors);
                 symbol.bindingElement = e;
                 members.set(symbol.escapedName, symbol);
             });
             var result = createAnonymousType(undefined, members, ts.emptyArray, ts.emptyArray, stringIndexInfo, undefined);
-            result.flags |= 268435456;
+            result.flags |= 268435456 /* ContainsObjectLiteral */;
             result.objectFlags |= objectFlags;
             if (includePatternInType) {
                 result.pattern = pattern;
             }
             return result;
         }
+        // Return the type implied by an array binding pattern
         function getTypeFromArrayBindingPattern(pattern, includePatternInType, reportErrors) {
             var elements = pattern.elements;
             var lastElement = ts.lastOrUndefined(elements);
             if (!lastElement || (!ts.isOmittedExpression(lastElement) && lastElement.dotDotDotToken)) {
-                return languageVersion >= 2 ? createIterableType(anyType) : anyArrayType;
+                return languageVersion >= 2 /* ES2015 */ ? createIterableType(anyType) : anyArrayType;
             }
+            // If the pattern has at least one element, and no rest element, then it should imply a tuple type.
             var elementTypes = ts.map(elements, function (e) { return ts.isOmittedExpression(e) ? anyType : getTypeFromBindingElement(e, includePatternInType, reportErrors); });
             var result = createTupleType(elementTypes);
             if (includePatternInType) {
@@ -26741,25 +33401,44 @@ var ts;
             }
             return result;
         }
+        // Return the type implied by a binding pattern. This is the type implied purely by the binding pattern itself
+        // and without regard to its context (i.e. without regard any type annotation or initializer associated with the
+        // declaration in which the binding pattern is contained). For example, the implied type of [x, y] is [any, any]
+        // and the implied type of { x, y: z = 1 } is { x: any; y: number; }. The type implied by a binding pattern is
+        // used as the contextual type of an initializer associated with the binding pattern. Also, for a destructuring
+        // parameter with no type annotation or initializer, the type implied by the binding pattern becomes the type of
+        // the parameter.
         function getTypeFromBindingPattern(pattern, includePatternInType, reportErrors) {
             if (includePatternInType === void 0) { includePatternInType = false; }
             if (reportErrors === void 0) { reportErrors = false; }
-            return pattern.kind === 180
+            return pattern.kind === 180 /* ObjectBindingPattern */
                 ? getTypeFromObjectBindingPattern(pattern, includePatternInType, reportErrors)
                 : getTypeFromArrayBindingPattern(pattern, includePatternInType, reportErrors);
         }
+        // Return the type associated with a variable, parameter, or property declaration. In the simple case this is the type
+        // specified in a type annotation or inferred from an initializer. However, in the case of a destructuring declaration it
+        // is a bit more involved. For example:
+        //
+        //   var [x, s = ""] = [1, "one"];
+        //
+        // Here, the array literal [1, "one"] is contextually typed by the type [any, string], which is the implied type of the
+        // binding pattern [x, s = ""]. Because the contextual type is a tuple type, the resulting type of [1, "one"] is the
+        // tuple type [number, string]. Thus, the type inferred for 'x' is number and the type inferred for 's' is string.
         function getWidenedTypeForVariableLikeDeclaration(declaration, reportErrors) {
-            var type = getTypeForVariableLikeDeclaration(declaration, true);
+            var type = getTypeForVariableLikeDeclaration(declaration, /*includeOptionality*/ true);
             if (type) {
                 if (reportErrors) {
                     reportErrorsFromWidening(declaration, type);
                 }
-                if (type.flags & 2048 && (ts.isBindingElement(declaration) || !declaration.type) && type.symbol !== getSymbolOfNode(declaration)) {
+                // always widen a 'unique symbol' type if the type was created for a different declaration.
+                if (type.flags & 2048 /* UniqueESSymbol */ && (ts.isBindingElement(declaration) || !declaration.type) && type.symbol !== getSymbolOfNode(declaration)) {
                     type = esSymbolType;
                 }
                 return getWidenedType(type);
             }
+            // Rest parameters default to type any[], other parameters default to type any
             type = ts.isParameter(declaration) && declaration.dotDotDotToken ? anyArrayType : anyType;
+            // Report implicit any errors unless this is a private property within an ambient declaration
             if (reportErrors && noImplicitAny) {
                 if (!declarationBelongsToPrivateAmbientMember(declaration)) {
                     reportImplicitAnyError(declaration, type);
@@ -26769,7 +33448,7 @@ var ts;
         }
         function declarationBelongsToPrivateAmbientMember(declaration) {
             var root = ts.getRootDeclaration(declaration);
-            var memberDeclaration = root.kind === 149 ? root.parent : root;
+            var memberDeclaration = root.kind === 149 /* Parameter */ ? root.parent : root;
             return isPrivateWithinAmbient(memberDeclaration);
         }
         function tryGetTypeFromEffectiveTypeNode(declaration) {
@@ -26781,32 +33460,42 @@ var ts;
         function getTypeOfVariableOrParameterOrProperty(symbol) {
             var links = getSymbolLinks(symbol);
             if (!links.type) {
-                if (symbol.flags & 4194304) {
+                // Handle prototype property
+                if (symbol.flags & 4194304 /* Prototype */) {
                     return links.type = getTypeOfPrototypeProperty(symbol);
                 }
+                // CommonsJS require and module both have type any.
                 if (symbol === requireSymbol || symbol === moduleSymbol) {
                     return links.type = anyType;
                 }
+                // Handle catch clause variables
                 var declaration = symbol.valueDeclaration;
                 if (ts.isCatchClauseVariableDeclarationOrBindingElement(declaration)) {
                     return links.type = anyType;
                 }
+                // Handle export default expressions
                 if (ts.isSourceFile(declaration)) {
                     var jsonSourceFile = ts.cast(declaration, ts.isJsonSourceFile);
                     return links.type = jsonSourceFile.statements.length ? checkExpression(jsonSourceFile.statements[0].expression) : emptyObjectType;
                 }
-                if (declaration.kind === 249) {
+                if (declaration.kind === 249 /* ExportAssignment */) {
                     return links.type = checkExpression(declaration.expression);
                 }
                 if (ts.isInJavaScriptFile(declaration) && ts.isJSDocPropertyLikeTag(declaration) && declaration.typeExpression) {
                     return links.type = getTypeFromTypeNode(declaration.typeExpression.type);
                 }
-                if (!pushTypeResolution(symbol, 0)) {
+                // Handle variable, parameter or property
+                if (!pushTypeResolution(symbol, 0 /* Type */)) {
                     return errorType;
                 }
                 var type = void 0;
-                if (declaration.kind === 200 ||
-                    declaration.kind === 185 && declaration.parent.kind === 200) {
+                // Handle certain special assignment kinds, which happen to union across multiple declarations:
+                // * module.exports = expr
+                // * exports.p = expr
+                // * this.p = expr
+                // * className.prototype.method = expr
+                if (declaration.kind === 200 /* BinaryExpression */ ||
+                    declaration.kind === 185 /* PropertyAccessExpression */ && declaration.parent.kind === 200 /* BinaryExpression */) {
                     type = getWidenedTypeFromJSSpecialPropertyDeclarations(symbol);
                 }
                 else if (ts.isJSDocPropertyLikeTag(declaration)
@@ -26816,7 +33505,8 @@ var ts;
                     || ts.isFunctionDeclaration(declaration)
                     || (ts.isMethodDeclaration(declaration) && !ts.isObjectLiteralMethod(declaration))
                     || ts.isMethodSignature(declaration)) {
-                    if (symbol.flags & (16 | 8192 | 32 | 384 | 512)) {
+                    // Symbol is property of some kind that is merged with something - should use `getTypeOfFuncClassEnumModule` and not `getTypeOfVariableOrParameterOrProperty`
+                    if (symbol.flags & (16 /* Function */ | 8192 /* Method */ | 32 /* Class */ | 384 /* Enum */ | 512 /* ValueModule */)) {
                         return getTypeOfFuncClassEnumModule(symbol);
                     }
                     type = tryGetTypeFromEffectiveTypeNode(declaration) || anyType;
@@ -26828,17 +33518,17 @@ var ts;
                     type = tryGetTypeFromEffectiveTypeNode(declaration) || checkJsxAttribute(declaration);
                 }
                 else if (ts.isShorthandPropertyAssignment(declaration)) {
-                    type = tryGetTypeFromEffectiveTypeNode(declaration) || checkExpressionForMutableLocation(declaration.name, 0);
+                    type = tryGetTypeFromEffectiveTypeNode(declaration) || checkExpressionForMutableLocation(declaration.name, 0 /* Normal */);
                 }
                 else if (ts.isObjectLiteralMethod(declaration)) {
-                    type = tryGetTypeFromEffectiveTypeNode(declaration) || checkObjectLiteralMethod(declaration, 0);
+                    type = tryGetTypeFromEffectiveTypeNode(declaration) || checkObjectLiteralMethod(declaration, 0 /* Normal */);
                 }
                 else if (ts.isParameter(declaration)
                     || ts.isPropertyDeclaration(declaration)
                     || ts.isPropertySignature(declaration)
                     || ts.isVariableDeclaration(declaration)
                     || ts.isBindingElement(declaration)) {
-                    type = getWidenedTypeForVariableLikeDeclaration(declaration, true);
+                    type = getWidenedTypeForVariableLikeDeclaration(declaration, /*reportErrors*/ true);
                 }
                 else {
                     return ts.Debug.fail("Unhandled declaration kind! " + ts.Debug.showSyntaxKind(declaration) + " for " + ts.Debug.showSymbol(symbol));
@@ -26852,7 +33542,7 @@ var ts;
         }
         function getAnnotatedAccessorType(accessor) {
             if (accessor) {
-                if (accessor.kind === 156) {
+                if (accessor.kind === 156 /* GetAccessor */) {
                     var getterTypeAnnotation = ts.getEffectiveReturnTypeNode(accessor);
                     return getterTypeAnnotation && getTypeFromTypeNode(getterTypeAnnotation);
                 }
@@ -26873,31 +33563,35 @@ var ts;
         function getTypeOfAccessors(symbol) {
             var links = getSymbolLinks(symbol);
             if (!links.type) {
-                var getter = ts.getDeclarationOfKind(symbol, 156);
-                var setter = ts.getDeclarationOfKind(symbol, 157);
+                var getter = ts.getDeclarationOfKind(symbol, 156 /* GetAccessor */);
+                var setter = ts.getDeclarationOfKind(symbol, 157 /* SetAccessor */);
                 if (getter && ts.isInJavaScriptFile(getter)) {
                     var jsDocType = getTypeForDeclarationFromJSDocComment(getter);
                     if (jsDocType) {
                         return links.type = jsDocType;
                     }
                 }
-                if (!pushTypeResolution(symbol, 0)) {
+                if (!pushTypeResolution(symbol, 0 /* Type */)) {
                     return errorType;
                 }
                 var type = void 0;
+                // First try to see if the user specified a return type on the get-accessor.
                 var getterReturnType = getAnnotatedAccessorType(getter);
                 if (getterReturnType) {
                     type = getterReturnType;
                 }
                 else {
+                    // If the user didn't specify a return type, try to use the set-accessor's parameter type.
                     var setterParameterType = getAnnotatedAccessorType(setter);
                     if (setterParameterType) {
                         type = setterParameterType;
                     }
                     else {
+                        // If there are no specified types, try to infer it from the body of the get accessor if it exists.
                         if (getter && getter.body) {
                             type = getReturnTypeFromBody(getter);
                         }
+                        // Otherwise, fall back to 'any'.
                         else {
                             if (noImplicitAny) {
                                 if (setter) {
@@ -26915,7 +33609,7 @@ var ts;
                 if (!popTypeResolution()) {
                     type = anyType;
                     if (noImplicitAny) {
-                        var getter_1 = ts.getDeclarationOfKind(symbol, 156);
+                        var getter_1 = ts.getDeclarationOfKind(symbol, 156 /* GetAccessor */);
                         error(getter_1, ts.Diagnostics._0_implicitly_has_return_type_any_because_it_does_not_have_a_return_type_annotation_and_is_referenced_directly_or_indirectly_in_one_of_its_return_expressions, symbolToString(symbol));
                     }
                 }
@@ -26925,7 +33619,7 @@ var ts;
         }
         function getBaseTypeVariableOfClass(symbol) {
             var baseConstructorType = getBaseConstructorTypeOfClass(getDeclaredTypeOfClassOrInterface(symbol));
-            return baseConstructorType.flags & 2162688 ? baseConstructorType : undefined;
+            return baseConstructorType.flags & 2162688 /* TypeVariable */ ? baseConstructorType : undefined;
         }
         function getTypeOfFuncClassEnumModule(symbol) {
             var links = getSymbolLinks(symbol);
@@ -26935,6 +33629,7 @@ var ts;
                     var jsSymbol = getSymbolOfNode(jsDeclaration);
                     if (jsSymbol && (ts.hasEntries(jsSymbol.exports) || ts.hasEntries(jsSymbol.members))) {
                         symbol = cloneSymbol(symbol);
+                        // note:we overwrite links because we just cloned the symbol
                         links = symbol;
                         if (ts.hasEntries(jsSymbol.exports)) {
                             symbol.exports = symbol.exports || ts.createSymbolTable();
@@ -26946,21 +33641,21 @@ var ts;
                         }
                     }
                 }
-                if (symbol.flags & 1536 && ts.isShorthandAmbientModuleSymbol(symbol)) {
+                if (symbol.flags & 1536 /* Module */ && ts.isShorthandAmbientModuleSymbol(symbol)) {
                     links.type = anyType;
                 }
-                else if (symbol.valueDeclaration.kind === 200 ||
-                    symbol.valueDeclaration.kind === 185 && symbol.valueDeclaration.parent.kind === 200) {
+                else if (symbol.valueDeclaration.kind === 200 /* BinaryExpression */ ||
+                    symbol.valueDeclaration.kind === 185 /* PropertyAccessExpression */ && symbol.valueDeclaration.parent.kind === 200 /* BinaryExpression */) {
                     links.type = getWidenedTypeFromJSSpecialPropertyDeclarations(symbol);
                 }
                 else {
-                    var type = createObjectType(16, symbol);
-                    if (symbol.flags & 32) {
+                    var type = createObjectType(16 /* Anonymous */, symbol);
+                    if (symbol.flags & 32 /* Class */) {
                         var baseTypeVariable = getBaseTypeVariableOfClass(symbol);
                         links.type = baseTypeVariable ? getIntersectionType([type, baseTypeVariable]) : type;
                     }
                     else {
-                        links.type = strictNullChecks && symbol.flags & 16777216 ? getOptionalType(type) : type;
+                        links.type = strictNullChecks && symbol.flags & 16777216 /* Optional */ ? getOptionalType(type) : type;
                     }
                 }
             }
@@ -26977,7 +33672,12 @@ var ts;
             var links = getSymbolLinks(symbol);
             if (!links.type) {
                 var targetSymbol = resolveAlias(symbol);
-                links.type = targetSymbol.flags & 67216319
+                // It only makes sense to get the type of a value symbol. If the result of resolving
+                // the alias is not a value, then it has no type. To get the type associated with a
+                // type symbol, call getDeclaredTypeOfSymbol.
+                // This check is important because without it, a call to getTypeOfSymbol could end
+                // up recursively calling getTypeOfAlias, causing a stack overflow.
+                links.type = targetSymbol.flags & 67216319 /* Value */
                     ? getTypeOfSymbol(targetSymbol)
                     : errorType;
             }
@@ -26991,7 +33691,7 @@ var ts;
                     links.type = errorType;
                 }
                 else {
-                    if (!pushTypeResolution(symbol, 0)) {
+                    if (!pushTypeResolution(symbol, 0 /* Type */)) {
                         return errorType;
                     }
                     symbolInstantiationDepth++;
@@ -27006,35 +33706,37 @@ var ts;
             return links.type;
         }
         function reportCircularityError(symbol) {
+            // Check if variable has type annotation that circularly references the variable itself
             if (ts.getEffectiveTypeAnnotationNode(symbol.valueDeclaration)) {
                 error(symbol.valueDeclaration, ts.Diagnostics._0_is_referenced_directly_or_indirectly_in_its_own_type_annotation, symbolToString(symbol));
                 return errorType;
             }
+            // Otherwise variable has initializer that circularly references the variable itself
             if (noImplicitAny) {
                 error(symbol.valueDeclaration, ts.Diagnostics._0_implicitly_has_type_any_because_it_does_not_have_a_type_annotation_and_is_referenced_directly_or_indirectly_in_its_own_initializer, symbolToString(symbol));
             }
             return anyType;
         }
         function getTypeOfSymbol(symbol) {
-            if (ts.getCheckFlags(symbol) & 1) {
+            if (ts.getCheckFlags(symbol) & 1 /* Instantiated */) {
                 return getTypeOfInstantiatedSymbol(symbol);
             }
-            if (ts.getCheckFlags(symbol) & 2048) {
+            if (ts.getCheckFlags(symbol) & 2048 /* ReverseMapped */) {
                 return getTypeOfReverseMappedSymbol(symbol);
             }
-            if (symbol.flags & (3 | 4)) {
+            if (symbol.flags & (3 /* Variable */ | 4 /* Property */)) {
                 return getTypeOfVariableOrParameterOrProperty(symbol);
             }
-            if (symbol.flags & (16 | 8192 | 32 | 384 | 512)) {
+            if (symbol.flags & (16 /* Function */ | 8192 /* Method */ | 32 /* Class */ | 384 /* Enum */ | 512 /* ValueModule */)) {
                 return getTypeOfFuncClassEnumModule(symbol);
             }
-            if (symbol.flags & 8) {
+            if (symbol.flags & 8 /* EnumMember */) {
                 return getTypeOfEnumMember(symbol);
             }
-            if (symbol.flags & 98304) {
+            if (symbol.flags & 98304 /* Accessor */) {
                 return getTypeOfAccessors(symbol);
             }
-            if (symbol.flags & 2097152) {
+            if (symbol.flags & 2097152 /* Alias */) {
                 return getTypeOfAlias(symbol);
             }
             return errorType;
@@ -27042,84 +33744,92 @@ var ts;
         function isReferenceToType(type, target) {
             return type !== undefined
                 && target !== undefined
-                && (ts.getObjectFlags(type) & 4) !== 0
+                && (ts.getObjectFlags(type) & 4 /* Reference */) !== 0
                 && type.target === target;
         }
         function getTargetType(type) {
-            return ts.getObjectFlags(type) & 4 ? type.target : type;
+            return ts.getObjectFlags(type) & 4 /* Reference */ ? type.target : type;
         }
+        // TODO: GH#18217 If `checkBase` is undefined, we should not call this because this will always return false.
         function hasBaseType(type, checkBase) {
             return check(type);
             function check(type) {
-                if (ts.getObjectFlags(type) & (3 | 4)) {
+                if (ts.getObjectFlags(type) & (3 /* ClassOrInterface */ | 4 /* Reference */)) {
                     var target = getTargetType(type);
                     return target === checkBase || ts.some(getBaseTypes(target), check);
                 }
-                else if (type.flags & 524288) {
+                else if (type.flags & 524288 /* Intersection */) {
                     return ts.some(type.types, check);
                 }
                 return false;
             }
         }
+        // Appends the type parameters given by a list of declarations to a set of type parameters and returns the resulting set.
+        // The function allocates a new array if the input type parameter set is undefined, but otherwise it modifies the set
+        // in-place and returns the same array.
         function appendTypeParameters(typeParameters, declarations) {
-            for (var _i = 0, declarations_2 = declarations; _i < declarations_2.length; _i++) {
-                var declaration = declarations_2[_i];
+            for (var _i = 0, declarations_1 = declarations; _i < declarations_1.length; _i++) {
+                var declaration = declarations_1[_i];
                 typeParameters = ts.appendIfUnique(typeParameters, getDeclaredTypeOfTypeParameter(getSymbolOfNode(declaration)));
             }
             return typeParameters;
         }
+        // Return the outer type parameters of a node or undefined if the node has no outer type parameters.
         function getOuterTypeParameters(node, includeThisTypes) {
             while (true) {
-                node = node.parent;
+                node = node.parent; // TODO: GH#18217 Use SourceFile kind check instead
                 if (!node) {
                     return undefined;
                 }
                 switch (node.kind) {
-                    case 235:
-                    case 205:
-                    case 236:
-                    case 158:
-                    case 159:
-                    case 153:
-                    case 163:
-                    case 164:
-                    case 284:
-                    case 234:
-                    case 154:
-                    case 192:
-                    case 193:
-                    case 237:
-                    case 296:
-                    case 297:
-                    case 292:
-                    case 177:
-                    case 171:
+                    case 235 /* ClassDeclaration */:
+                    case 205 /* ClassExpression */:
+                    case 236 /* InterfaceDeclaration */:
+                    case 158 /* CallSignature */:
+                    case 159 /* ConstructSignature */:
+                    case 153 /* MethodSignature */:
+                    case 163 /* FunctionType */:
+                    case 164 /* ConstructorType */:
+                    case 284 /* JSDocFunctionType */:
+                    case 234 /* FunctionDeclaration */:
+                    case 154 /* MethodDeclaration */:
+                    case 192 /* FunctionExpression */:
+                    case 193 /* ArrowFunction */:
+                    case 237 /* TypeAliasDeclaration */:
+                    case 296 /* JSDocTemplateTag */:
+                    case 297 /* JSDocTypedefTag */:
+                    case 292 /* JSDocCallbackTag */:
+                    case 177 /* MappedType */:
+                    case 171 /* ConditionalType */:
                         var outerTypeParameters = getOuterTypeParameters(node, includeThisTypes);
-                        if (node.kind === 177) {
+                        if (node.kind === 177 /* MappedType */) {
                             return ts.append(outerTypeParameters, getDeclaredTypeOfTypeParameter(getSymbolOfNode(node.typeParameter)));
                         }
-                        else if (node.kind === 171) {
+                        else if (node.kind === 171 /* ConditionalType */) {
                             return ts.concatenate(outerTypeParameters, getInferTypeParameters(node));
                         }
                         var outerAndOwnTypeParameters = appendTypeParameters(outerTypeParameters, ts.getEffectiveTypeParameterDeclarations(node));
                         var thisType = includeThisTypes &&
-                            (node.kind === 235 || node.kind === 205 || node.kind === 236) &&
+                            (node.kind === 235 /* ClassDeclaration */ || node.kind === 205 /* ClassExpression */ || node.kind === 236 /* InterfaceDeclaration */) &&
                             getDeclaredTypeOfClassOrInterface(getSymbolOfNode(node)).thisType;
                         return thisType ? ts.append(outerAndOwnTypeParameters, thisType) : outerAndOwnTypeParameters;
                 }
             }
         }
+        // The outer type parameters are those defined by enclosing generic classes, methods, or functions.
         function getOuterTypeParametersOfClassOrInterface(symbol) {
-            var declaration = symbol.flags & 32 ? symbol.valueDeclaration : ts.getDeclarationOfKind(symbol, 236);
+            var declaration = symbol.flags & 32 /* Class */ ? symbol.valueDeclaration : ts.getDeclarationOfKind(symbol, 236 /* InterfaceDeclaration */);
             return getOuterTypeParameters(declaration);
         }
+        // The local type parameters are the combined set of type parameters from all declarations of the class,
+        // interface, or type alias.
         function getLocalTypeParametersOfClassOrInterfaceOrTypeAlias(symbol) {
             var result;
             for (var _i = 0, _a = symbol.declarations; _i < _a.length; _i++) {
                 var node = _a[_i];
-                if (node.kind === 236 ||
-                    node.kind === 235 ||
-                    node.kind === 205 ||
+                if (node.kind === 236 /* InterfaceDeclaration */ ||
+                    node.kind === 235 /* ClassDeclaration */ ||
+                    node.kind === 205 /* ClassExpression */ ||
                     ts.isTypeAlias(node)) {
                     var declaration = node;
                     result = appendTypeParameters(result, ts.getEffectiveTypeParameterDeclarations(declaration));
@@ -27127,11 +33837,15 @@ var ts;
             }
             return result;
         }
+        // The full set of type parameters for a generic class or interface type consists of its outer type parameters plus
+        // its locally declared type parameters.
         function getTypeParametersOfClassOrInterface(symbol) {
             return ts.concatenate(getOuterTypeParametersOfClassOrInterface(symbol), getLocalTypeParametersOfClassOrInterfaceOrTypeAlias(symbol));
         }
+        // A type is a mixin constructor if it has a single construct signature taking no type parameters and a single
+        // rest parameter of type any[].
         function isMixinConstructorType(type) {
-            var signatures = getSignaturesOfType(type, 1);
+            var signatures = getSignaturesOfType(type, 1 /* Construct */);
             if (signatures.length === 1) {
                 var s = signatures[0];
                 return !s.typeParameters && s.parameters.length === 1 && s.hasRestParameter && getTypeOfParameter(s.parameters[0]) === anyArrayType;
@@ -27139,10 +33853,10 @@ var ts;
             return false;
         }
         function isConstructorType(type) {
-            if (isValidBaseType(type) && getSignaturesOfType(type, 1).length > 0) {
+            if (isValidBaseType(type) && getSignaturesOfType(type, 1 /* Construct */).length > 0) {
                 return true;
             }
-            if (type.flags & 2162688) {
+            if (type.flags & 2162688 /* TypeVariable */) {
                 var constraint = getBaseConstraintOfType(type);
                 return !!constraint && isValidBaseType(constraint) && isMixinConstructorType(constraint);
             }
@@ -27151,6 +33865,7 @@ var ts;
         function getBaseTypeNodeOfClass(type) {
             var decl = type.symbol.valueDeclaration;
             if (ts.isInJavaScriptFile(decl)) {
+                // Prefer an @augments tag because it may have type parameters.
                 var tag = ts.getJSDocAugmentsTag(decl);
                 if (tag) {
                     return tag.class;
@@ -27161,13 +33876,21 @@ var ts;
         function getConstructorsForTypeArguments(type, typeArgumentNodes, location) {
             var typeArgCount = ts.length(typeArgumentNodes);
             var isJavaScript = ts.isInJavaScriptFile(location);
-            return ts.filter(getSignaturesOfType(type, 1), function (sig) { return (isJavaScript || typeArgCount >= getMinTypeArgumentCount(sig.typeParameters)) && typeArgCount <= ts.length(sig.typeParameters); });
+            return ts.filter(getSignaturesOfType(type, 1 /* Construct */), function (sig) { return (isJavaScript || typeArgCount >= getMinTypeArgumentCount(sig.typeParameters)) && typeArgCount <= ts.length(sig.typeParameters); });
         }
         function getInstantiatedConstructorsForTypeArguments(type, typeArgumentNodes, location) {
             var signatures = getConstructorsForTypeArguments(type, typeArgumentNodes, location);
             var typeArguments = ts.map(typeArgumentNodes, getTypeFromTypeNode);
             return ts.sameMap(signatures, function (sig) { return ts.some(sig.typeParameters) ? getSignatureInstantiation(sig, typeArguments, ts.isInJavaScriptFile(location)) : sig; });
         }
+        /**
+         * The base constructor of a class can resolve to
+         * * undefinedType if the class has no extends clause,
+         * * unknownType if an error occurred during resolution of the extends expression,
+         * * nullType if the extends expression is the null value,
+         * * anyType if the extends expression has type any, or
+         * * an object type with at least one construct signature.
+         */
         function getBaseConstructorTypeOfClass(type) {
             if (!type.resolvedBaseConstructorType) {
                 var decl = type.symbol.valueDeclaration;
@@ -27176,22 +33899,24 @@ var ts;
                 if (!baseTypeNode) {
                     return type.resolvedBaseConstructorType = undefinedType;
                 }
-                if (!pushTypeResolution(type, 1)) {
+                if (!pushTypeResolution(type, 1 /* ResolvedBaseConstructorType */)) {
                     return errorType;
                 }
                 var baseConstructorType = checkExpression(baseTypeNode.expression);
                 if (extended && baseTypeNode !== extended) {
-                    ts.Debug.assert(!extended.typeArguments);
+                    ts.Debug.assert(!extended.typeArguments); // Because this is in a JS file, and baseTypeNode is in an @extends tag
                     checkExpression(extended.expression);
                 }
-                if (baseConstructorType.flags & (131072 | 524288)) {
+                if (baseConstructorType.flags & (131072 /* Object */ | 524288 /* Intersection */)) {
+                    // Resolving the members of a class requires us to resolve the base class of that class.
+                    // We force resolution here such that we catch circularities now.
                     resolveStructuredTypeMembers(baseConstructorType);
                 }
                 if (!popTypeResolution()) {
                     error(type.symbol.valueDeclaration, ts.Diagnostics._0_is_referenced_directly_or_indirectly_in_its_own_base_expression, symbolToString(type.symbol));
                     return type.resolvedBaseConstructorType = errorType;
                 }
-                if (!(baseConstructorType.flags & 1) && baseConstructorType !== nullWideningType && !isConstructorType(baseConstructorType)) {
+                if (!(baseConstructorType.flags & 1 /* Any */) && baseConstructorType !== nullWideningType && !isConstructorType(baseConstructorType)) {
                     error(baseTypeNode.expression, ts.Diagnostics.Type_0_is_not_a_constructor_function_type, typeToString(baseConstructorType));
                     return type.resolvedBaseConstructorType = errorType;
                 }
@@ -27201,14 +33926,14 @@ var ts;
         }
         function getBaseTypes(type) {
             if (!type.resolvedBaseTypes) {
-                if (type.objectFlags & 8) {
+                if (type.objectFlags & 8 /* Tuple */) {
                     type.resolvedBaseTypes = [createArrayType(getUnionType(type.typeParameters))];
                 }
-                else if (type.symbol.flags & (32 | 64)) {
-                    if (type.symbol.flags & 32) {
+                else if (type.symbol.flags & (32 /* Class */ | 64 /* Interface */)) {
+                    if (type.symbol.flags & 32 /* Class */) {
                         resolveBaseTypesOfClass(type);
                     }
-                    if (type.symbol.flags & 64) {
+                    if (type.symbol.flags & 64 /* Interface */) {
                         resolveBaseTypesOfInterface(type);
                     }
                 }
@@ -27221,21 +33946,27 @@ var ts;
         function resolveBaseTypesOfClass(type) {
             type.resolvedBaseTypes = ts.resolvingEmptyArray;
             var baseConstructorType = getApparentType(getBaseConstructorTypeOfClass(type));
-            if (!(baseConstructorType.flags & (131072 | 524288 | 1))) {
+            if (!(baseConstructorType.flags & (131072 /* Object */ | 524288 /* Intersection */ | 1 /* Any */))) {
                 return type.resolvedBaseTypes = ts.emptyArray;
             }
             var baseTypeNode = getBaseTypeNodeOfClass(type);
             var typeArgs = typeArgumentsFromTypeReferenceNode(baseTypeNode);
             var baseType;
             var originalBaseType = baseConstructorType && baseConstructorType.symbol ? getDeclaredTypeOfSymbol(baseConstructorType.symbol) : undefined;
-            if (baseConstructorType.symbol && baseConstructorType.symbol.flags & 32 &&
+            if (baseConstructorType.symbol && baseConstructorType.symbol.flags & 32 /* Class */ &&
                 areAllOuterTypeParametersApplied(originalBaseType)) {
+                // When base constructor type is a class with no captured type arguments we know that the constructors all have the same type parameters as the
+                // class and all return the instance type of the class. There is no need for further checks and we can apply the
+                // type arguments in the same manner as a type reference to get the same error reporting experience.
                 baseType = getTypeFromClassOrInterfaceReference(baseTypeNode, baseConstructorType.symbol, typeArgs);
             }
-            else if (baseConstructorType.flags & 1) {
+            else if (baseConstructorType.flags & 1 /* Any */) {
                 baseType = baseConstructorType;
             }
             else {
+                // The class derives from a "class-like" constructor function, check that we have at least one construct signature
+                // with a matching number of type parameters and use the return type of the first instantiated signature. Elsewhere
+                // we check that all instantiated signatures return the same type.
                 var constructors = getInstantiatedConstructorsForTypeArguments(baseConstructorType, baseTypeNode.typeArguments, baseTypeNode);
                 if (!constructors.length) {
                     error(baseTypeNode.expression, ts.Diagnostics.No_base_constructor_has_the_specified_number_of_type_arguments);
@@ -27251,15 +33982,21 @@ var ts;
                 return type.resolvedBaseTypes = ts.emptyArray;
             }
             if (type === baseType || hasBaseType(baseType, type)) {
-                error(type.symbol.valueDeclaration, ts.Diagnostics.Type_0_recursively_references_itself_as_a_base_type, typeToString(type, undefined, 2));
+                error(type.symbol.valueDeclaration, ts.Diagnostics.Type_0_recursively_references_itself_as_a_base_type, typeToString(type, /*enclosingDeclaration*/ undefined, 2 /* WriteArrayAsGenericType */));
                 return type.resolvedBaseTypes = ts.emptyArray;
             }
             if (type.resolvedBaseTypes === ts.resolvingEmptyArray) {
-                type.members = undefined;
+                // Circular reference, likely through instantiation of default parameters
+                // (otherwise there'd be an error from hasBaseType) - this is fine, but `.members` should be reset
+                // as `getIndexedAccessType` via `instantiateType` via `getTypeFromClassOrInterfaceReference` forces a
+                // partial instantiation of the members without the base types fully resolved
+                type.members = undefined; // TODO: GH#18217
             }
             return type.resolvedBaseTypes = [baseType];
         }
         function areAllOuterTypeParametersApplied(type) {
+            // An unapplied type parameter has its symbol still the same as the matching argument symbol.
+            // Since parameters are applied outer-to-inner, only the last outer parameter needs to be checked.
             var outerTypeParameters = type.outerTypeParameters;
             if (outerTypeParameters) {
                 var last_1 = outerTypeParameters.length - 1;
@@ -27268,15 +34005,17 @@ var ts;
             }
             return true;
         }
+        // A valid base type is `any`, any non-generic object type or intersection of non-generic
+        // object types.
         function isValidBaseType(type) {
-            return !!(type.flags & (131072 | 16777216 | 1)) && !isGenericMappedType(type) ||
-                !!(type.flags & 524288) && !ts.some(type.types, function (t) { return !isValidBaseType(t); });
+            return !!(type.flags & (131072 /* Object */ | 16777216 /* NonPrimitive */ | 1 /* Any */)) && !isGenericMappedType(type) ||
+                !!(type.flags & 524288 /* Intersection */) && ts.every(type.types, isValidBaseType);
         }
         function resolveBaseTypesOfInterface(type) {
             type.resolvedBaseTypes = type.resolvedBaseTypes || ts.emptyArray;
             for (var _i = 0, _a = type.symbol.declarations; _i < _a.length; _i++) {
                 var declaration = _a[_i];
-                if (declaration.kind === 236 && ts.getInterfaceBaseTypeNodes(declaration)) {
+                if (declaration.kind === 236 /* InterfaceDeclaration */ && ts.getInterfaceBaseTypeNodes(declaration)) {
                     for (var _b = 0, _c = ts.getInterfaceBaseTypeNodes(declaration); _b < _c.length; _b++) {
                         var node = _c[_b];
                         var baseType = getTypeFromTypeNode(node);
@@ -27291,7 +34030,7 @@ var ts;
                                     }
                                 }
                                 else {
-                                    error(declaration, ts.Diagnostics.Type_0_recursively_references_itself_as_a_base_type, typeToString(type, undefined, 2));
+                                    error(declaration, ts.Diagnostics.Type_0_recursively_references_itself_as_a_base_type, typeToString(type, /*enclosingDeclaration*/ undefined, 2 /* WriteArrayAsGenericType */));
                                 }
                             }
                             else {
@@ -27302,11 +34041,18 @@ var ts;
                 }
             }
         }
+        /**
+         * Returns true if the interface given by the symbol is free of "this" references.
+         *
+         * Specifically, the result is true if the interface itself contains no references
+         * to "this" in its body, if all base types are interfaces,
+         * and if none of the base interfaces have a "this" type.
+         */
         function isThislessInterface(symbol) {
             for (var _i = 0, _a = symbol.declarations; _i < _a.length; _i++) {
                 var declaration = _a[_i];
-                if (declaration.kind === 236) {
-                    if (declaration.flags & 64) {
+                if (declaration.kind === 236 /* InterfaceDeclaration */) {
+                    if (declaration.flags & 64 /* ContainsThis */) {
                         return false;
                     }
                     var baseTypeNodes = ts.getInterfaceBaseTypeNodes(declaration);
@@ -27314,8 +34060,8 @@ var ts;
                         for (var _b = 0, baseTypeNodes_1 = baseTypeNodes; _b < baseTypeNodes_1.length; _b++) {
                             var node = baseTypeNodes_1[_b];
                             if (ts.isEntityNameExpression(node.expression)) {
-                                var baseSymbol = resolveEntityName(node.expression, 67901928, true);
-                                if (!baseSymbol || !(baseSymbol.flags & 64) || getDeclaredTypeOfClassOrInterface(baseSymbol).thisType) {
+                                var baseSymbol = resolveEntityName(node.expression, 67901928 /* Type */, /*ignoreErrors*/ true);
+                                if (!baseSymbol || !(baseSymbol.flags & 64 /* Interface */) || getDeclaredTypeOfClassOrInterface(baseSymbol).thisType) {
                                     return false;
                                 }
                             }
@@ -27328,12 +34074,17 @@ var ts;
         function getDeclaredTypeOfClassOrInterface(symbol) {
             var links = getSymbolLinks(symbol);
             if (!links.declaredType) {
-                var kind = symbol.flags & 32 ? 1 : 2;
+                var kind = symbol.flags & 32 /* Class */ ? 1 /* Class */ : 2 /* Interface */;
                 var type = links.declaredType = createObjectType(kind, symbol);
                 var outerTypeParameters = getOuterTypeParametersOfClassOrInterface(symbol);
                 var localTypeParameters = getLocalTypeParametersOfClassOrInterfaceOrTypeAlias(symbol);
-                if (outerTypeParameters || localTypeParameters || kind === 1 || !isThislessInterface(symbol)) {
-                    type.objectFlags |= 4;
+                // A class or interface is generic if it has type parameters or a "this" type. We always give classes a "this" type
+                // because it is not feasible to analyze all members to determine if the "this" type escapes the class (in particular,
+                // property types inferred from initializers and method return types inferred from return statements are very hard
+                // to exhaustively analyze). We give interfaces a "this" type if we can't definitely determine that they are free of
+                // "this" references.
+                if (outerTypeParameters || localTypeParameters || kind === 1 /* Class */ || !isThislessInterface(symbol)) {
+                    type.objectFlags |= 4 /* Reference */;
                     type.typeParameters = ts.concatenate(outerTypeParameters, localTypeParameters);
                     type.outerTypeParameters = outerTypeParameters;
                     type.localTypeParameters = localTypeParameters;
@@ -27341,7 +34092,7 @@ var ts;
                     type.instantiations.set(getTypeListId(type.typeParameters), type);
                     type.target = type;
                     type.typeArguments = type.typeParameters;
-                    type.thisType = createType(65536);
+                    type.thisType = createType(65536 /* TypeParameter */);
                     type.thisType.isThisType = true;
                     type.thisType.symbol = symbol;
                     type.thisType.constraint = type;
@@ -27352,17 +34103,22 @@ var ts;
         function getDeclaredTypeOfTypeAlias(symbol) {
             var links = getSymbolLinks(symbol);
             if (!links.declaredType) {
-                if (!pushTypeResolution(symbol, 2)) {
+                // Note that we use the links object as the target here because the symbol object is used as the unique
+                // identity for resolution of the 'type' property in SymbolLinks.
+                if (!pushTypeResolution(symbol, 2 /* DeclaredType */)) {
                     return errorType;
                 }
                 var declaration = ts.find(symbol.declarations, function (d) {
-                    return ts.isJSDocTypeAlias(d) || d.kind === 237;
+                    return ts.isJSDocTypeAlias(d) || d.kind === 237 /* TypeAliasDeclaration */;
                 });
                 var typeNode = ts.isJSDocTypeAlias(declaration) ? declaration.typeExpression : declaration.type;
+                // If typeNode is missing, we will error in checkJSDocTypedefTag.
                 var type = typeNode ? getTypeFromTypeNode(typeNode) : errorType;
                 if (popTypeResolution()) {
                     var typeParameters = getLocalTypeParametersOfClassOrInterfaceOrTypeAlias(symbol);
                     if (typeParameters) {
+                        // Initialize the instantiation cache for generic type aliases. The declared type corresponds to
+                        // an instantiation of the type alias with the type parameters supplied as type arguments.
                         links.typeParameters = typeParameters;
                         links.instantiations = ts.createMap();
                         links.instantiations.set(getTypeListId(typeParameters), type);
@@ -27377,10 +34133,10 @@ var ts;
             return links.declaredType;
         }
         function isStringConcatExpression(expr) {
-            if (expr.kind === 9) {
+            if (expr.kind === 9 /* StringLiteral */) {
                 return true;
             }
-            else if (expr.kind === 200) {
+            else if (expr.kind === 200 /* BinaryExpression */) {
                 return isStringConcatExpression(expr.left) && isStringConcatExpression(expr.right);
             }
             return false;
@@ -27388,18 +34144,18 @@ var ts;
         function isLiteralEnumMember(member) {
             var expr = member.initializer;
             if (!expr) {
-                return !(member.flags & 4194304);
+                return !(member.flags & 4194304 /* Ambient */);
             }
             switch (expr.kind) {
-                case 9:
-                case 8:
+                case 9 /* StringLiteral */:
+                case 8 /* NumericLiteral */:
                     return true;
-                case 198:
-                    return expr.operator === 38 &&
-                        expr.operand.kind === 8;
-                case 71:
+                case 198 /* PrefixUnaryExpression */:
+                    return expr.operator === 38 /* MinusToken */ &&
+                        expr.operand.kind === 8 /* NumericLiteral */;
+                case 71 /* Identifier */:
                     return ts.nodeIsMissing(expr) || !!getSymbolOfNode(member.parent).exports.get(expr.escapedText);
-                case 200:
+                case 200 /* BinaryExpression */:
                     return isStringConcatExpression(expr);
                 default:
                     return false;
@@ -27413,11 +34169,11 @@ var ts;
             var hasNonLiteralMember = false;
             for (var _i = 0, _a = symbol.declarations; _i < _a.length; _i++) {
                 var declaration = _a[_i];
-                if (declaration.kind === 238) {
+                if (declaration.kind === 238 /* EnumDeclaration */) {
                     for (var _b = 0, _c = declaration.members; _b < _c.length; _b++) {
                         var member = _c[_b];
-                        if (member.initializer && member.initializer.kind === 9) {
-                            return links.enumKind = 1;
+                        if (member.initializer && member.initializer.kind === 9 /* StringLiteral */) {
+                            return links.enumKind = 1 /* Literal */;
                         }
                         if (!isLiteralEnumMember(member)) {
                             hasNonLiteralMember = true;
@@ -27425,40 +34181,40 @@ var ts;
                     }
                 }
             }
-            return links.enumKind = hasNonLiteralMember ? 0 : 1;
+            return links.enumKind = hasNonLiteralMember ? 0 /* Numeric */ : 1 /* Literal */;
         }
         function getBaseTypeOfEnumLiteralType(type) {
-            return type.flags & 512 && !(type.flags & 262144) ? getDeclaredTypeOfSymbol(getParentOfSymbol(type.symbol)) : type;
+            return type.flags & 512 /* EnumLiteral */ && !(type.flags & 262144 /* Union */) ? getDeclaredTypeOfSymbol(getParentOfSymbol(type.symbol)) : type;
         }
         function getDeclaredTypeOfEnum(symbol) {
             var links = getSymbolLinks(symbol);
             if (links.declaredType) {
                 return links.declaredType;
             }
-            if (getEnumKind(symbol) === 1) {
+            if (getEnumKind(symbol) === 1 /* Literal */) {
                 enumCount++;
                 var memberTypeList = [];
                 for (var _i = 0, _a = symbol.declarations; _i < _a.length; _i++) {
                     var declaration = _a[_i];
-                    if (declaration.kind === 238) {
+                    if (declaration.kind === 238 /* EnumDeclaration */) {
                         for (var _b = 0, _c = declaration.members; _b < _c.length; _b++) {
                             var member = _c[_b];
-                            var memberType = getLiteralType(getEnumMemberValue(member), enumCount, getSymbolOfNode(member));
+                            var memberType = getLiteralType(getEnumMemberValue(member), enumCount, getSymbolOfNode(member)); // TODO: GH#18217
                             getSymbolLinks(getSymbolOfNode(member)).declaredType = memberType;
                             memberTypeList.push(memberType);
                         }
                     }
                 }
                 if (memberTypeList.length) {
-                    var enumType_1 = getUnionType(memberTypeList, 1, symbol, undefined);
-                    if (enumType_1.flags & 262144) {
-                        enumType_1.flags |= 512;
+                    var enumType_1 = getUnionType(memberTypeList, 1 /* Literal */, symbol, /*aliasTypeArguments*/ undefined);
+                    if (enumType_1.flags & 262144 /* Union */) {
+                        enumType_1.flags |= 512 /* EnumLiteral */;
                         enumType_1.symbol = symbol;
                     }
                     return links.declaredType = enumType_1;
                 }
             }
-            var enumType = createType(32);
+            var enumType = createType(32 /* Enum */);
             enumType.symbol = symbol;
             return links.declaredType = enumType;
         }
@@ -27475,7 +34231,7 @@ var ts;
         function getDeclaredTypeOfTypeParameter(symbol) {
             var links = getSymbolLinks(symbol);
             if (!links.declaredType) {
-                var type = createType(65536);
+                var type = createType(65536 /* TypeParameter */);
                 type.symbol = symbol;
                 links.declaredType = type;
             }
@@ -27492,83 +34248,107 @@ var ts;
             return tryGetDeclaredTypeOfSymbol(symbol) || errorType;
         }
         function tryGetDeclaredTypeOfSymbol(symbol) {
-            if (symbol.flags & (32 | 64)) {
+            if (symbol.flags & (32 /* Class */ | 64 /* Interface */)) {
                 return getDeclaredTypeOfClassOrInterface(symbol);
             }
-            if (symbol.flags & 524288) {
+            if (symbol.flags & 524288 /* TypeAlias */) {
                 return getDeclaredTypeOfTypeAlias(symbol);
             }
-            if (symbol.flags & 262144) {
+            if (symbol.flags & 262144 /* TypeParameter */) {
                 return getDeclaredTypeOfTypeParameter(symbol);
             }
-            if (symbol.flags & 384) {
+            if (symbol.flags & 384 /* Enum */) {
                 return getDeclaredTypeOfEnum(symbol);
             }
-            if (symbol.flags & 8) {
+            if (symbol.flags & 8 /* EnumMember */) {
                 return getDeclaredTypeOfEnumMember(symbol);
             }
-            if (symbol.flags & 2097152) {
+            if (symbol.flags & 2097152 /* Alias */) {
                 return getDeclaredTypeOfAlias(symbol);
             }
             return undefined;
         }
+        /**
+         * A type is free of this references if it's the any, string, number, boolean, symbol, or void keyword, a string
+         * literal type, an array with an element type that is free of this references, or a type reference that is
+         * free of this references.
+         */
         function isThislessType(node) {
             switch (node.kind) {
-                case 119:
-                case 142:
-                case 137:
-                case 134:
-                case 122:
-                case 138:
-                case 135:
-                case 105:
-                case 140:
-                case 95:
-                case 131:
-                case 178:
+                case 119 /* AnyKeyword */:
+                case 142 /* UnknownKeyword */:
+                case 137 /* StringKeyword */:
+                case 134 /* NumberKeyword */:
+                case 122 /* BooleanKeyword */:
+                case 138 /* SymbolKeyword */:
+                case 135 /* ObjectKeyword */:
+                case 105 /* VoidKeyword */:
+                case 140 /* UndefinedKeyword */:
+                case 95 /* NullKeyword */:
+                case 131 /* NeverKeyword */:
+                case 178 /* LiteralType */:
                     return true;
-                case 167:
+                case 167 /* ArrayType */:
                     return isThislessType(node.elementType);
-                case 162:
+                case 162 /* TypeReference */:
                     return !node.typeArguments || node.typeArguments.every(isThislessType);
             }
             return false;
         }
+        /** A type parameter is thisless if its contraint is thisless, or if it has no constraint. */
         function isThislessTypeParameter(node) {
             return !node.constraint || isThislessType(node.constraint);
         }
+        /**
+         * A variable-like declaration is free of this references if it has a type annotation
+         * that is thisless, or if it has no type annotation and no initializer (and is thus of type any).
+         */
         function isThislessVariableLikeDeclaration(node) {
             var typeNode = ts.getEffectiveTypeAnnotationNode(node);
             return typeNode ? isThislessType(typeNode) : !ts.hasInitializer(node);
         }
+        /**
+         * A function-like declaration is considered free of `this` references if it has a return type
+         * annotation that is free of this references and if each parameter is thisless and if
+         * each type parameter (if present) is thisless.
+         */
         function isThislessFunctionLikeDeclaration(node) {
             var returnType = ts.getEffectiveReturnTypeNode(node);
             var typeParameters = ts.getEffectiveTypeParameterDeclarations(node);
-            return (node.kind === 155 || (!!returnType && isThislessType(returnType))) &&
+            return (node.kind === 155 /* Constructor */ || (!!returnType && isThislessType(returnType))) &&
                 node.parameters.every(isThislessVariableLikeDeclaration) &&
                 typeParameters.every(isThislessTypeParameter);
         }
+        /**
+         * Returns true if the class or interface member given by the symbol is free of "this" references. The
+         * function may return false for symbols that are actually free of "this" references because it is not
+         * feasible to perform a complete analysis in all cases. In particular, property members with types
+         * inferred from their initializers and function members with inferred return types are conservatively
+         * assumed not to be free of "this" references.
+         */
         function isThisless(symbol) {
             if (symbol.declarations && symbol.declarations.length === 1) {
                 var declaration = symbol.declarations[0];
                 if (declaration) {
                     switch (declaration.kind) {
-                        case 152:
-                        case 151:
+                        case 152 /* PropertyDeclaration */:
+                        case 151 /* PropertySignature */:
                             return isThislessVariableLikeDeclaration(declaration);
-                        case 154:
-                        case 153:
-                        case 155:
+                        case 154 /* MethodDeclaration */:
+                        case 153 /* MethodSignature */:
+                        case 155 /* Constructor */:
                             return isThislessFunctionLikeDeclaration(declaration);
                     }
                 }
             }
             return false;
         }
+        // The mappingThisOnly flag indicates that the only type parameter being mapped is "this". When the flag is true,
+        // we check symbols to see if we can quickly conclude they are free of "this" references, thus needing no instantiation.
         function createInstantiatedSymbolTable(symbols, mapper, mappingThisOnly) {
             var result = ts.createSymbolTable();
-            for (var _i = 0, symbols_2 = symbols; _i < symbols_2.length; _i++) {
-                var symbol = symbols_2[_i];
+            for (var _i = 0, symbols_1 = symbols; _i < symbols_1.length; _i++) {
+                var symbol = symbols_1[_i];
                 result.set(symbol.escapedName, mappingThisOnly && isThisless(symbol) ? symbol : instantiateSymbol(symbol, mapper));
             }
             return result;
@@ -27586,44 +34366,73 @@ var ts;
                 var symbol = type.symbol;
                 var members = getMembersOfSymbol(symbol);
                 type.declaredProperties = getNamedMembers(members);
+                // Start with signatures at empty array in case of recursive types
                 type.declaredCallSignatures = ts.emptyArray;
                 type.declaredConstructSignatures = ts.emptyArray;
-                type.declaredCallSignatures = getSignaturesOfSymbol(members.get("__call"));
-                type.declaredConstructSignatures = getSignaturesOfSymbol(members.get("__new"));
-                type.declaredStringIndexInfo = getIndexInfoOfSymbol(symbol, 0);
-                type.declaredNumberIndexInfo = getIndexInfoOfSymbol(symbol, 1);
+                type.declaredCallSignatures = getSignaturesOfSymbol(members.get("__call" /* Call */));
+                type.declaredConstructSignatures = getSignaturesOfSymbol(members.get("__new" /* New */));
+                type.declaredStringIndexInfo = getIndexInfoOfSymbol(symbol, 0 /* String */);
+                type.declaredNumberIndexInfo = getIndexInfoOfSymbol(symbol, 1 /* Number */);
             }
             return type;
         }
+        /**
+         * Indicates whether a type can be used as a late-bound name.
+         */
         function isTypeUsableAsLateBoundName(type) {
-            return !!(type.flags & 2240);
+            return !!(type.flags & 2240 /* StringOrNumberLiteralOrUnique */);
         }
+        /**
+         * Indicates whether a declaration name is definitely late-bindable.
+         * A declaration name is only late-bindable if:
+         * - It is a `ComputedPropertyName`.
+         * - Its expression is an `Identifier` or either a `PropertyAccessExpression` an
+         * `ElementAccessExpression` consisting only of these same three types of nodes.
+         * - The type of its expression is a string or numeric literal type, or is a `unique symbol` type.
+         */
         function isLateBindableName(node) {
             return ts.isComputedPropertyName(node)
                 && ts.isEntityNameExpression(node.expression)
                 && isTypeUsableAsLateBoundName(checkComputedPropertyName(node));
         }
+        /**
+         * Indicates whether a declaration has a late-bindable dynamic name.
+         */
         function hasLateBindableName(node) {
             var name = ts.getNameOfDeclaration(node);
             return !!name && isLateBindableName(name);
         }
+        /**
+         * Indicates whether a declaration has a dynamic name that cannot be late-bound.
+         */
         function hasNonBindableDynamicName(node) {
             return ts.hasDynamicName(node) && !hasLateBindableName(node);
         }
+        /**
+         * Indicates whether a declaration name is a dynamic name that cannot be late-bound.
+         */
         function isNonBindableDynamicName(node) {
             return ts.isDynamicName(node) && !isLateBindableName(node);
         }
+        /**
+         * Gets the symbolic name for a late-bound member from its type.
+         */
         function getLateBoundNameFromType(type) {
-            if (type.flags & 2048) {
+            if (type.flags & 2048 /* UniqueESSymbol */) {
                 return "__@" + type.symbol.escapedName + "@" + getSymbolId(type.symbol);
             }
-            if (type.flags & 192) {
+            if (type.flags & 192 /* StringOrNumberLiteral */) {
                 return ts.escapeLeadingUnderscores("" + type.value);
             }
             return ts.Debug.fail();
         }
+        /**
+         * Adds a declaration to a late-bound dynamic member. This performs the same function for
+         * late-bound members that `addDeclarationToSymbol` in binder.ts performs for early-bound
+         * members.
+         */
         function addDeclarationToLateBoundSymbol(symbol, member, symbolFlags) {
-            ts.Debug.assert(!!(ts.getCheckFlags(symbol) & 1024), "Expected a late-bound symbol.");
+            ts.Debug.assert(!!(ts.getCheckFlags(symbol) & 1024 /* Late */), "Expected a late-bound symbol.");
             symbol.flags |= symbolFlags;
             getSymbolLinks(member.symbol).lateSymbol = symbol;
             if (!symbol.declarations) {
@@ -27632,31 +34441,67 @@ var ts;
             else {
                 symbol.declarations.push(member);
             }
-            if (symbolFlags & 67216319) {
+            if (symbolFlags & 67216319 /* Value */) {
                 if (!symbol.valueDeclaration || symbol.valueDeclaration.kind !== member.kind) {
                     symbol.valueDeclaration = member;
                 }
             }
         }
+        /**
+         * Performs late-binding of a dynamic member. This performs the same function for
+         * late-bound members that `declareSymbol` in binder.ts performs for early-bound
+         * members.
+         *
+         * If a symbol is a dynamic name from a computed property, we perform an additional "late"
+         * binding phase to attempt to resolve the name for the symbol from the type of the computed
+         * property's expression. If the type of the expression is a string-literal, numeric-literal,
+         * or unique symbol type, we can use that type as the name of the symbol.
+         *
+         * For example, given:
+         *
+         *   const x = Symbol();
+         *
+         *   interface I {
+         *     [x]: number;
+         *   }
+         *
+         * The binder gives the property `[x]: number` a special symbol with the name "__computed".
+         * In the late-binding phase we can type-check the expression `x` and see that it has a
+         * unique symbol type which we can then use as the name of the member. This allows users
+         * to define custom symbols that can be used in the members of an object type.
+         *
+         * @param parent The containing symbol for the member.
+         * @param earlySymbols The early-bound symbols of the parent.
+         * @param lateSymbols The late-bound symbols of the parent.
+         * @param decl The member to bind.
+         */
         function lateBindMember(parent, earlySymbols, lateSymbols, decl) {
             ts.Debug.assert(!!decl.symbol, "The member is expected to have a symbol.");
             var links = getNodeLinks(decl);
             if (!links.resolvedSymbol) {
+                // In the event we attempt to resolve the late-bound name of this member recursively,
+                // fall back to the early-bound name of this member.
                 links.resolvedSymbol = decl.symbol;
                 var type = checkComputedPropertyName(decl.name);
                 if (isTypeUsableAsLateBoundName(type)) {
                     var memberName = getLateBoundNameFromType(type);
                     var symbolFlags = decl.symbol.flags;
+                    // Get or add a late-bound symbol for the member. This allows us to merge late-bound accessor declarations.
                     var lateSymbol = lateSymbols.get(memberName);
                     if (!lateSymbol)
-                        lateSymbols.set(memberName, lateSymbol = createSymbol(0, memberName, 1024));
+                        lateSymbols.set(memberName, lateSymbol = createSymbol(0 /* None */, memberName, 1024 /* Late */));
+                    // Report an error if a late-bound member has the same name as an early-bound member,
+                    // or if we have another early-bound symbol declaration with the same name and
+                    // conflicting flags.
                     var earlySymbol = earlySymbols && earlySymbols.get(memberName);
                     if (lateSymbol.flags & getExcludedSymbolFlags(symbolFlags) || earlySymbol) {
+                        // If we have an existing early-bound member, combine its declarations so that we can
+                        // report an error at each declaration.
                         var declarations = earlySymbol ? ts.concatenate(earlySymbol.declarations, lateSymbol.declarations) : lateSymbol.declarations;
-                        var name_2 = ts.declarationNameToString(decl.name);
-                        ts.forEach(declarations, function (declaration) { return error(ts.getNameOfDeclaration(declaration) || declaration, ts.Diagnostics.Duplicate_declaration_0, name_2); });
-                        error(decl.name || decl, ts.Diagnostics.Duplicate_declaration_0, name_2);
-                        lateSymbol = createSymbol(0, memberName, 1024);
+                        var name_1 = ts.declarationNameToString(decl.name);
+                        ts.forEach(declarations, function (declaration) { return error(ts.getNameOfDeclaration(declaration) || declaration, ts.Diagnostics.Duplicate_declaration_0, name_1); });
+                        error(decl.name || decl, ts.Diagnostics.Duplicate_declaration_0, name_1);
+                        lateSymbol = createSymbol(0 /* None */, memberName, 1024 /* Late */);
                     }
                     lateSymbol.nameType = type;
                     addDeclarationToLateBoundSymbol(lateSymbol, decl, symbolFlags);
@@ -27674,18 +34519,22 @@ var ts;
         function getResolvedMembersOrExportsOfSymbol(symbol, resolutionKind) {
             var links = getSymbolLinks(symbol);
             if (!links[resolutionKind]) {
-                var isStatic = resolutionKind === "resolvedExports";
+                var isStatic = resolutionKind === "resolvedExports" /* resolvedExports */;
                 var earlySymbols = !isStatic ? symbol.members :
-                    symbol.flags & 1536 ? getExportsOfModuleWorker(symbol) :
+                    symbol.flags & 1536 /* Module */ ? getExportsOfModuleWorker(symbol) :
                         symbol.exports;
+                // In the event we recursively resolve the members/exports of the symbol, we
+                // set the initial value of resolvedMembers/resolvedExports to the early-bound
+                // members/exports of the symbol.
                 links[resolutionKind] = earlySymbols || emptySymbols;
+                // fill in any as-yet-unresolved late-bound members.
                 var lateSymbols = ts.createSymbolTable();
                 for (var _i = 0, _a = symbol.declarations; _i < _a.length; _i++) {
                     var decl = _a[_i];
                     var members = ts.getMembersOfDeclaration(decl);
                     if (members) {
-                        for (var _b = 0, members_4 = members; _b < members_4.length; _b++) {
-                            var member = members_4[_b];
+                        for (var _b = 0, members_3 = members; _b < members_3.length; _b++) {
+                            var member = members_3[_b];
                             if (isStatic === ts.hasStaticModifier(member) && hasLateBindableName(member)) {
                                 lateBindMember(symbol, earlySymbols, lateSymbols, member);
                             }
@@ -27696,15 +34545,27 @@ var ts;
             }
             return links[resolutionKind];
         }
+        /**
+         * Gets a SymbolTable containing both the early- and late-bound members of a symbol.
+         *
+         * For a description of late-binding, see `lateBindMember`.
+         */
         function getMembersOfSymbol(symbol) {
-            return symbol.flags & 6240
-                ? getResolvedMembersOrExportsOfSymbol(symbol, "resolvedMembers")
+            return symbol.flags & 6240 /* LateBindingContainer */
+                ? getResolvedMembersOrExportsOfSymbol(symbol, "resolvedMembers" /* resolvedMembers */)
                 : symbol.members || emptySymbols;
         }
+        /**
+         * If a symbol is the dynamic name of the member of an object type, get the late-bound
+         * symbol of the member.
+         *
+         * For a description of late-binding, see `lateBindMember`.
+         */
         function getLateBoundSymbol(symbol) {
-            if (symbol.flags & 106500 && symbol.escapedName === "__computed") {
+            if (symbol.flags & 106500 /* ClassMember */ && symbol.escapedName === "__computed" /* Computed */) {
                 var links = getSymbolLinks(symbol);
                 if (!links.lateSymbol && ts.some(symbol.declarations, hasLateBindableName)) {
+                    // force late binding of members/exports. This will set the late-bound symbol
                     if (ts.some(symbol.declarations, ts.hasStaticModifier)) {
                         getExportsOfSymbol(symbol.parent);
                     }
@@ -27717,7 +34578,7 @@ var ts;
             return symbol;
         }
         function getTypeWithThisArgument(type, thisArgument, needApparentType) {
-            if (ts.getObjectFlags(type) & 4) {
+            if (ts.getObjectFlags(type) & 4 /* Reference */) {
                 var target = type.target;
                 var typeArguments = type.typeArguments;
                 if (ts.length(target.typeParameters) === ts.length(typeArguments)) {
@@ -27725,7 +34586,7 @@ var ts;
                     return needApparentType ? getApparentType(ref) : ref;
                 }
             }
-            else if (type.flags & 524288) {
+            else if (type.flags & 524288 /* Intersection */) {
                 return getIntersectionType(ts.map(type.types, function (t) { return getTypeWithThisArgument(t, thisArgument, needApparentType); }));
             }
             return needApparentType ? getApparentType(type) : type;
@@ -27747,7 +34608,7 @@ var ts;
             }
             else {
                 mapper = createTypeMapper(typeParameters, typeArguments);
-                members = createInstantiatedSymbolTable(source.declaredProperties, mapper, typeParameters.length === 1);
+                members = createInstantiatedSymbolTable(source.declaredProperties, mapper, /*mappingThisOnly*/ typeParameters.length === 1);
                 callSignatures = instantiateSignatures(source.declaredCallSignatures, mapper);
                 constructSignatures = instantiateSignatures(source.declaredConstructSignatures, mapper);
                 stringIndexInfo = instantiateIndexInfo(source.declaredStringIndexInfo, mapper);
@@ -27764,14 +34625,14 @@ var ts;
                     var baseType = baseTypes_1[_i];
                     var instantiatedBaseType = thisArgument ? getTypeWithThisArgument(instantiateType(baseType, mapper), thisArgument) : baseType;
                     addInheritedMembers(members, getPropertiesOfType(instantiatedBaseType));
-                    callSignatures = ts.concatenate(callSignatures, getSignaturesOfType(instantiatedBaseType, 0));
-                    constructSignatures = ts.concatenate(constructSignatures, getSignaturesOfType(instantiatedBaseType, 1));
+                    callSignatures = ts.concatenate(callSignatures, getSignaturesOfType(instantiatedBaseType, 0 /* Call */));
+                    constructSignatures = ts.concatenate(constructSignatures, getSignaturesOfType(instantiatedBaseType, 1 /* Construct */));
                     if (!stringIndexInfo) {
                         stringIndexInfo = instantiatedBaseType === anyType ?
-                            createIndexInfo(anyType, false) :
-                            getIndexInfoOfType(instantiatedBaseType, 0);
+                            createIndexInfo(anyType, /*isReadonly*/ false) :
+                            getIndexInfoOfType(instantiatedBaseType, 0 /* String */);
                     }
-                    numberIndexInfo = numberIndexInfo || getIndexInfoOfType(instantiatedBaseType, 1);
+                    numberIndexInfo = numberIndexInfo || getIndexInfoOfType(instantiatedBaseType, 1 /* Number */);
                 }
             }
             setStructuredTypeMembers(type, members, callSignatures, constructSignatures, stringIndexInfo, numberIndexInfo);
@@ -27802,13 +34663,14 @@ var ts;
             return sig;
         }
         function cloneSignature(sig) {
-            return createSignature(sig.declaration, sig.typeParameters, sig.thisParameter, sig.parameters, undefined, undefined, sig.minArgumentCount, sig.hasRestParameter, sig.hasLiteralTypes);
+            return createSignature(sig.declaration, sig.typeParameters, sig.thisParameter, sig.parameters, /*resolvedReturnType*/ undefined, 
+            /*resolvedTypePredicate*/ undefined, sig.minArgumentCount, sig.hasRestParameter, sig.hasLiteralTypes);
         }
         function getDefaultConstructSignatures(classType) {
             var baseConstructorType = getBaseConstructorTypeOfClass(classType);
-            var baseSignatures = getSignaturesOfType(baseConstructorType, 1);
+            var baseSignatures = getSignaturesOfType(baseConstructorType, 1 /* Construct */);
             if (baseSignatures.length === 0) {
-                return [createSignature(undefined, classType.localTypeParameters, undefined, ts.emptyArray, classType, undefined, 0, false, false)];
+                return [createSignature(undefined, classType.localTypeParameters, undefined, ts.emptyArray, classType, /*resolvedTypePredicate*/ undefined, 0, /*hasRestParameter*/ false, /*hasLiteralTypes*/ false)]; // TODO: GH#18217
             }
             var baseTypeNode = getBaseTypeNodeOfClass(classType);
             var isJavaScript = ts.isInJavaScriptFile(baseTypeNode);
@@ -27838,11 +34700,13 @@ var ts;
         }
         function findMatchingSignatures(signatureLists, signature, listIndex) {
             if (signature.typeParameters) {
+                // We require an exact match for generic signatures, so we only return signatures from the first
+                // signature list and only if they have exact matches in the other signature lists.
                 if (listIndex > 0) {
                     return undefined;
                 }
                 for (var i = 1; i < signatureLists.length; i++) {
-                    if (!findMatchingSignature(signatureLists[i], signature, false, false, false)) {
+                    if (!findMatchingSignature(signatureLists[i], signature, /*partialMatch*/ false, /*ignoreThisTypes*/ false, /*ignoreReturnTypes*/ false)) {
                         return undefined;
                     }
                 }
@@ -27850,7 +34714,8 @@ var ts;
             }
             var result;
             for (var i = 0; i < signatureLists.length; i++) {
-                var match = i === listIndex ? signature : findMatchingSignature(signatureLists[i], signature, true, true, true);
+                // Allow matching non-generic signatures to have excess parameters and different return types
+                var match = i === listIndex ? signature : findMatchingSignature(signatureLists[i], signature, /*partialMatch*/ true, /*ignoreThisTypes*/ true, /*ignoreReturnTypes*/ true);
                 if (!match) {
                     return undefined;
                 }
@@ -27858,20 +34723,27 @@ var ts;
             }
             return result;
         }
+        // The signatures of a union type are those signatures that are present in each of the constituent types.
+        // Generic signatures must match exactly, but non-generic signatures are allowed to have extra optional
+        // parameters and may differ in return types. When signatures differ in return types, the resulting return
+        // type is the union of the constituent return types.
         function getUnionSignatures(types, kind) {
             var signatureLists = ts.map(types, function (t) { return getSignaturesOfType(t, kind); });
             var result;
             for (var i = 0; i < signatureLists.length; i++) {
                 for (var _i = 0, _a = signatureLists[i]; _i < _a.length; _i++) {
                     var signature = _a[_i];
-                    if (!result || !findMatchingSignature(result, signature, false, true, true)) {
+                    // Only process signatures with parameter lists that aren't already in the result list
+                    if (!result || !findMatchingSignature(result, signature, /*partialMatch*/ false, /*ignoreThisTypes*/ true, /*ignoreReturnTypes*/ true)) {
                         var unionSignatures = findMatchingSignatures(signatureLists, signature, i);
                         if (unionSignatures) {
                             var s = signature;
+                            // Union the result types when more than one signature matches
                             if (unionSignatures.length > 1) {
                                 var thisParameter = signature.thisParameter;
                                 if (ts.forEach(unionSignatures, function (sig) { return sig.thisParameter; })) {
-                                    var thisType = getUnionType(ts.map(unionSignatures, function (sig) { return sig.thisParameter ? getTypeOfSymbol(sig.thisParameter) : anyType; }), 2);
+                                    // TODO: GH#18217 We tested that *some* has thisParameter and now act as if *all* do
+                                    var thisType = getUnionType(ts.map(unionSignatures, function (sig) { return sig.thisParameter ? getTypeOfSymbol(sig.thisParameter) : anyType; }), 2 /* Subtype */);
                                     thisParameter = createSymbolWithType(signature.thisParameter, thisType);
                                 }
                                 s = cloneSignature(signature);
@@ -27897,13 +34769,15 @@ var ts;
                 indexTypes.push(indexInfo.type);
                 isAnyReadonly = isAnyReadonly || indexInfo.isReadonly;
             }
-            return createIndexInfo(getUnionType(indexTypes, 2), isAnyReadonly);
+            return createIndexInfo(getUnionType(indexTypes, 2 /* Subtype */), isAnyReadonly);
         }
         function resolveUnionTypeMembers(type) {
-            var callSignatures = getUnionSignatures(type.types, 0);
-            var constructSignatures = getUnionSignatures(type.types, 1);
-            var stringIndexInfo = getUnionIndexInfo(type.types, 0);
-            var numberIndexInfo = getUnionIndexInfo(type.types, 1);
+            // The members and properties collections are empty for union types. To get all properties of a union
+            // type use getPropertiesOfType (only the language service uses this).
+            var callSignatures = getUnionSignatures(type.types, 0 /* Call */);
+            var constructSignatures = getUnionSignatures(type.types, 1 /* Construct */);
+            var stringIndexInfo = getUnionIndexInfo(type.types, 0 /* String */);
+            var numberIndexInfo = getUnionIndexInfo(type.types, 1 /* Number */);
             setStructuredTypeMembers(type, emptySymbols, callSignatures, constructSignatures, stringIndexInfo, numberIndexInfo);
         }
         function intersectTypes(type1, type2) {
@@ -27922,22 +34796,29 @@ var ts;
                     mixedTypes.push(type);
                 }
                 else if (isMixinConstructorType(types[i])) {
-                    mixedTypes.push(getReturnTypeOfSignature(getSignaturesOfType(types[i], 1)[0]));
+                    mixedTypes.push(getReturnTypeOfSignature(getSignaturesOfType(types[i], 1 /* Construct */)[0]));
                 }
             }
             return getIntersectionType(mixedTypes);
         }
         function resolveIntersectionTypeMembers(type) {
+            // The members and properties collections are empty for intersection types. To get all properties of an
+            // intersection type use getPropertiesOfType (only the language service uses this).
             var callSignatures = ts.emptyArray;
             var constructSignatures = ts.emptyArray;
             var stringIndexInfo;
             var numberIndexInfo;
             var types = type.types;
             var mixinCount = ts.countWhere(types, isMixinConstructorType);
-            var _loop_4 = function (i) {
+            var _loop_2 = function (i) {
                 var t = type.types[i];
+                // When an intersection type contains mixin constructor types, the construct signatures from
+                // those types are discarded and their return types are mixed into the return types of all
+                // other construct signatures in the intersection type. For example, the intersection type
+                // '{ new(...args: any[]) => A } & { new(s: string) => B }' has a single construct signature
+                // 'new(s: string) => A & B'.
                 if (mixinCount === 0 || mixinCount === types.length && i === 0 || !isMixinConstructorType(t)) {
-                    var signatures = getSignaturesOfType(t, 1);
+                    var signatures = getSignaturesOfType(t, 1 /* Construct */);
                     if (signatures.length && mixinCount > 0) {
                         signatures = ts.map(signatures, function (s) {
                             var clone = cloneSignature(s);
@@ -27947,59 +34828,68 @@ var ts;
                     }
                     constructSignatures = ts.concatenate(constructSignatures, signatures);
                 }
-                callSignatures = ts.concatenate(callSignatures, getSignaturesOfType(t, 0));
-                stringIndexInfo = intersectIndexInfos(stringIndexInfo, getIndexInfoOfType(t, 0));
-                numberIndexInfo = intersectIndexInfos(numberIndexInfo, getIndexInfoOfType(t, 1));
+                callSignatures = ts.concatenate(callSignatures, getSignaturesOfType(t, 0 /* Call */));
+                stringIndexInfo = intersectIndexInfos(stringIndexInfo, getIndexInfoOfType(t, 0 /* String */));
+                numberIndexInfo = intersectIndexInfos(numberIndexInfo, getIndexInfoOfType(t, 1 /* Number */));
             };
             for (var i = 0; i < types.length; i++) {
-                _loop_4(i);
+                _loop_2(i);
             }
             setStructuredTypeMembers(type, emptySymbols, callSignatures, constructSignatures, stringIndexInfo, numberIndexInfo);
         }
+        /**
+         * Converts an AnonymousType to a ResolvedType.
+         */
         function resolveAnonymousTypeMembers(type) {
             var symbol = type.symbol;
             if (type.target) {
-                var members = createInstantiatedSymbolTable(getPropertiesOfObjectType(type.target), type.mapper, false);
-                var callSignatures = instantiateSignatures(getSignaturesOfType(type.target, 0), type.mapper);
-                var constructSignatures = instantiateSignatures(getSignaturesOfType(type.target, 1), type.mapper);
-                var stringIndexInfo = instantiateIndexInfo(getIndexInfoOfType(type.target, 0), type.mapper);
-                var numberIndexInfo = instantiateIndexInfo(getIndexInfoOfType(type.target, 1), type.mapper);
+                var members = createInstantiatedSymbolTable(getPropertiesOfObjectType(type.target), type.mapper, /*mappingThisOnly*/ false);
+                var callSignatures = instantiateSignatures(getSignaturesOfType(type.target, 0 /* Call */), type.mapper);
+                var constructSignatures = instantiateSignatures(getSignaturesOfType(type.target, 1 /* Construct */), type.mapper);
+                var stringIndexInfo = instantiateIndexInfo(getIndexInfoOfType(type.target, 0 /* String */), type.mapper);
+                var numberIndexInfo = instantiateIndexInfo(getIndexInfoOfType(type.target, 1 /* Number */), type.mapper);
                 setStructuredTypeMembers(type, members, callSignatures, constructSignatures, stringIndexInfo, numberIndexInfo);
             }
-            else if (symbol.flags & 2048) {
+            else if (symbol.flags & 2048 /* TypeLiteral */) {
                 var members = getMembersOfSymbol(symbol);
-                var callSignatures = getSignaturesOfSymbol(members.get("__call"));
-                var constructSignatures = getSignaturesOfSymbol(members.get("__new"));
-                var stringIndexInfo = getIndexInfoOfSymbol(symbol, 0);
-                var numberIndexInfo = getIndexInfoOfSymbol(symbol, 1);
+                var callSignatures = getSignaturesOfSymbol(members.get("__call" /* Call */));
+                var constructSignatures = getSignaturesOfSymbol(members.get("__new" /* New */));
+                var stringIndexInfo = getIndexInfoOfSymbol(symbol, 0 /* String */);
+                var numberIndexInfo = getIndexInfoOfSymbol(symbol, 1 /* Number */);
                 setStructuredTypeMembers(type, members, callSignatures, constructSignatures, stringIndexInfo, numberIndexInfo);
             }
             else {
+                // Combinations of function, class, enum and module
                 var members = emptySymbols;
                 var stringIndexInfo = void 0;
                 if (symbol.exports) {
                     members = getExportsOfSymbol(symbol);
                 }
                 setStructuredTypeMembers(type, members, ts.emptyArray, ts.emptyArray, undefined, undefined);
-                if (symbol.flags & 32) {
+                if (symbol.flags & 32 /* Class */) {
                     var classType = getDeclaredTypeOfClassOrInterface(symbol);
                     var baseConstructorType = getBaseConstructorTypeOfClass(classType);
-                    if (baseConstructorType.flags & (131072 | 524288 | 2162688)) {
+                    if (baseConstructorType.flags & (131072 /* Object */ | 524288 /* Intersection */ | 2162688 /* TypeVariable */)) {
                         members = ts.createSymbolTable(getNamedMembers(members));
                         addInheritedMembers(members, getPropertiesOfType(baseConstructorType));
                     }
                     else if (baseConstructorType === anyType) {
-                        stringIndexInfo = createIndexInfo(anyType, false);
+                        stringIndexInfo = createIndexInfo(anyType, /*isReadonly*/ false);
                     }
                 }
-                var numberIndexInfo = symbol.flags & 384 ? enumNumberIndexInfo : undefined;
+                var numberIndexInfo = symbol.flags & 384 /* Enum */ ? enumNumberIndexInfo : undefined;
                 setStructuredTypeMembers(type, members, ts.emptyArray, ts.emptyArray, stringIndexInfo, numberIndexInfo);
-                if (symbol.flags & (16 | 8192)) {
+                // We resolve the members before computing the signatures because a signature may use
+                // typeof with a qualified name expression that circularly references the type we are
+                // in the process of resolving (see issue #6072). The temporarily empty signature list
+                // will never be observed because a qualified name can't reference signatures.
+                if (symbol.flags & (16 /* Function */ | 8192 /* Method */)) {
                     type.callSignatures = getSignaturesOfSymbol(symbol);
                 }
-                if (symbol.flags & 32) {
+                // And likewise for construct signatures for classes
+                if (symbol.flags & 32 /* Class */) {
                     var classType = getDeclaredTypeOfClassOrInterface(symbol);
-                    var constructSignatures = getSignaturesOfSymbol(symbol.members.get("__constructor"));
+                    var constructSignatures = getSignaturesOfSymbol(symbol.members.get("__constructor" /* Constructor */));
                     if (!constructSignatures.length) {
                         constructSignatures = getDefaultConstructSignatures(classType);
                     }
@@ -28008,16 +34898,16 @@ var ts;
             }
         }
         function resolveReverseMappedTypeMembers(type) {
-            var indexInfo = getIndexInfoOfType(type.source, 0);
+            var indexInfo = getIndexInfoOfType(type.source, 0 /* String */);
             var modifiers = getMappedTypeModifiers(type.mappedType);
-            var readonlyMask = modifiers & 1 ? false : true;
-            var optionalMask = modifiers & 4 ? 0 : 16777216;
+            var readonlyMask = modifiers & 1 /* IncludeReadonly */ ? false : true;
+            var optionalMask = modifiers & 4 /* IncludeOptional */ ? 0 : 16777216 /* Optional */;
             var stringIndexInfo = indexInfo && createIndexInfo(inferReverseMappedType(indexInfo.type, type.mappedType), readonlyMask && indexInfo.isReadonly);
             var members = ts.createSymbolTable();
             for (var _i = 0, _a = getPropertiesOfType(type.source); _i < _a.length; _i++) {
                 var prop = _a[_i];
-                var checkFlags = 2048 | (readonlyMask && isReadonlySymbol(prop) ? 8 : 0);
-                var inferredProp = createSymbol(4 | prop.flags & optionalMask, prop.escapedName, checkFlags);
+                var checkFlags = 2048 /* ReverseMapped */ | (readonlyMask && isReadonlySymbol(prop) ? 8 /* Readonly */ : 0);
+                var inferredProp = createSymbol(4 /* Property */ | prop.flags & optionalMask, prop.escapedName, checkFlags);
                 inferredProp.declarations = prop.declarations;
                 inferredProp.nameType = prop.nameType;
                 inferredProp.propertyType = getTypeOfSymbol(prop);
@@ -28026,48 +34916,64 @@ var ts;
             }
             setStructuredTypeMembers(type, members, ts.emptyArray, ts.emptyArray, stringIndexInfo, undefined);
         }
+        /** Resolve the members of a mapped type { [P in K]: T } */
         function resolveMappedTypeMembers(type) {
             var members = ts.createSymbolTable();
             var stringIndexInfo;
             var numberIndexInfo;
+            // Resolve upfront such that recursive references see an empty object type.
             setStructuredTypeMembers(type, emptySymbols, ts.emptyArray, ts.emptyArray, undefined, undefined);
+            // In { [P in K]: T }, we refer to P as the type parameter type, K as the constraint type,
+            // and T as the template type.
             var typeParameter = getTypeParameterFromMappedType(type);
             var constraintType = getConstraintTypeFromMappedType(type);
             var templateType = getTemplateTypeFromMappedType(type.target || type);
-            var modifiersType = getApparentType(getModifiersTypeFromMappedType(type));
+            var modifiersType = getApparentType(getModifiersTypeFromMappedType(type)); // The 'T' in 'keyof T'
             var templateModifiers = getMappedTypeModifiers(type);
-            var include = keyofStringsOnly ? 64 : 2240;
+            var include = keyofStringsOnly ? 64 /* StringLiteral */ : 2240 /* StringOrNumberLiteralOrUnique */;
             if (isMappedTypeWithKeyofConstraintDeclaration(type)) {
+                // We have a { [P in keyof T]: X }
                 for (var _i = 0, _a = getPropertiesOfType(modifiersType); _i < _a.length; _i++) {
                     var prop = _a[_i];
-                    addMemberForKeyType(getLiteralTypeFromPropertyName(prop, include), undefined, prop);
+                    addMemberForKeyType(getLiteralTypeFromPropertyName(prop, include), /*_index*/ undefined, prop);
                 }
-                if (modifiersType.flags & 1 || getIndexInfoOfType(modifiersType, 0)) {
+                if (modifiersType.flags & 1 /* Any */ || getIndexInfoOfType(modifiersType, 0 /* String */)) {
                     addMemberForKeyType(stringType);
                 }
-                if (!keyofStringsOnly && getIndexInfoOfType(modifiersType, 1)) {
+                if (!keyofStringsOnly && getIndexInfoOfType(modifiersType, 1 /* Number */)) {
                     addMemberForKeyType(numberType);
                 }
             }
             else {
-                var keyType = constraintType.flags & 14745600 ? getApparentType(constraintType) : constraintType;
-                var iterationType = keyType.flags & 1048576 ? getIndexType(getApparentType(keyType.type)) : keyType;
+                // First, if the constraint type is a type parameter, obtain the base constraint. Then,
+                // if the key type is a 'keyof X', obtain 'keyof C' where C is the base constraint of X.
+                // Finally, iterate over the constituents of the resulting iteration type.
+                var keyType = constraintType.flags & 14745600 /* InstantiableNonPrimitive */ ? getApparentType(constraintType) : constraintType;
+                var iterationType = keyType.flags & 1048576 /* Index */ ? getIndexType(getApparentType(keyType.type)) : keyType;
                 forEachType(iterationType, addMemberForKeyType);
             }
             setStructuredTypeMembers(type, members, ts.emptyArray, ts.emptyArray, stringIndexInfo, numberIndexInfo);
             function addMemberForKeyType(t, _index, origin) {
+                // Create a mapper from T to the current iteration type constituent. Then, if the
+                // mapped type is itself an instantiated type, combine the iteration mapper with the
+                // instantiation mapper.
                 var templateMapper = combineTypeMappers(type.mapper, createTypeMapper([typeParameter], [t]));
                 var propType = instantiateType(templateType, templateMapper);
-                if (t.flags & 2240) {
+                // If the current iteration type constituent is a string literal type, create a property.
+                // Otherwise, for type string create a string index signature.
+                if (t.flags & 2240 /* StringOrNumberLiteralOrUnique */) {
                     var propName = getLateBoundNameFromType(t);
                     var modifiersProp = getPropertyOfType(modifiersType, propName);
-                    var isOptional = !!(templateModifiers & 4 ||
-                        !(templateModifiers & 8) && modifiersProp && modifiersProp.flags & 16777216);
-                    var isReadonly = !!(templateModifiers & 1 ||
-                        !(templateModifiers & 2) && modifiersProp && isReadonlySymbol(modifiersProp));
-                    var prop = createSymbol(4 | (isOptional ? 16777216 : 0), propName, isReadonly ? 8 : 0);
+                    var isOptional = !!(templateModifiers & 4 /* IncludeOptional */ ||
+                        !(templateModifiers & 8 /* ExcludeOptional */) && modifiersProp && modifiersProp.flags & 16777216 /* Optional */);
+                    var isReadonly = !!(templateModifiers & 1 /* IncludeReadonly */ ||
+                        !(templateModifiers & 2 /* ExcludeReadonly */) && modifiersProp && isReadonlySymbol(modifiersProp));
+                    var prop = createSymbol(4 /* Property */ | (isOptional ? 16777216 /* Optional */ : 0), propName, isReadonly ? 8 /* Readonly */ : 0);
+                    // When creating an optional property in strictNullChecks mode, if 'undefined' isn't assignable to the
+                    // type, we include 'undefined' in the type. Similarly, when creating a non-optional property in strictNullChecks
+                    // mode, if the underlying property is optional we remove 'undefined' from the type.
                     prop.type = strictNullChecks && isOptional && !isTypeAssignableTo(undefinedType, propType) ? getOptionalType(propType) :
-                        strictNullChecks && !isOptional && modifiersProp && modifiersProp.flags & 16777216 ? getTypeWithFacts(propType, 131072) :
+                        strictNullChecks && !isOptional && modifiersProp && modifiersProp.flags & 16777216 /* Optional */ ? getTypeWithFacts(propType, 131072 /* NEUndefined */) :
                             propType;
                     if (origin) {
                         prop.syntheticOrigin = origin;
@@ -28076,11 +34982,11 @@ var ts;
                     prop.nameType = t;
                     members.set(propName, prop);
                 }
-                else if (t.flags & (1 | 4)) {
-                    stringIndexInfo = createIndexInfo(propType, !!(templateModifiers & 1));
+                else if (t.flags & (1 /* Any */ | 4 /* String */)) {
+                    stringIndexInfo = createIndexInfo(propType, !!(templateModifiers & 1 /* IncludeReadonly */));
                 }
-                else if (t.flags & 8) {
-                    numberIndexInfo = createIndexInfo(propType, !!(templateModifiers & 1));
+                else if (t.flags & 8 /* Number */) {
+                    numberIndexInfo = createIndexInfo(propType, !!(templateModifiers & 1 /* IncludeReadonly */));
                 }
             }
         }
@@ -28095,39 +35001,45 @@ var ts;
         function getTemplateTypeFromMappedType(type) {
             return type.templateType ||
                 (type.templateType = type.declaration.type ?
-                    instantiateType(addOptionality(getTypeFromTypeNode(type.declaration.type), !!(getMappedTypeModifiers(type) & 4)), type.mapper || identityMapper) :
+                    instantiateType(addOptionality(getTypeFromTypeNode(type.declaration.type), !!(getMappedTypeModifiers(type) & 4 /* IncludeOptional */)), type.mapper || identityMapper) :
                     errorType);
         }
         function getConstraintDeclarationForMappedType(type) {
             return type.declaration.typeParameter.constraint;
         }
         function isMappedTypeWithKeyofConstraintDeclaration(type) {
-            var constraintDeclaration = getConstraintDeclarationForMappedType(type);
-            return constraintDeclaration.kind === 175 &&
-                constraintDeclaration.operator === 128;
+            var constraintDeclaration = getConstraintDeclarationForMappedType(type); // TODO: GH#18217
+            return constraintDeclaration.kind === 175 /* TypeOperator */ &&
+                constraintDeclaration.operator === 128 /* KeyOfKeyword */;
         }
         function getModifiersTypeFromMappedType(type) {
             if (!type.modifiersType) {
                 if (isMappedTypeWithKeyofConstraintDeclaration(type)) {
+                    // If the constraint declaration is a 'keyof T' node, the modifiers type is T. We check
+                    // AST nodes here because, when T is a non-generic type, the logic below eagerly resolves
+                    // 'keyof T' to a literal union type and we can't recover T from that type.
                     type.modifiersType = instantiateType(getTypeFromTypeNode(getConstraintDeclarationForMappedType(type).type), type.mapper || identityMapper);
                 }
                 else {
+                    // Otherwise, get the declared constraint type, and if the constraint type is a type parameter,
+                    // get the constraint of that type parameter. If the resulting type is an indexed type 'keyof T',
+                    // the modifiers type is T. Otherwise, the modifiers type is {}.
                     var declaredType = getTypeFromMappedTypeNode(type.declaration);
                     var constraint = getConstraintTypeFromMappedType(declaredType);
-                    var extendedConstraint = constraint && constraint.flags & 65536 ? getConstraintOfTypeParameter(constraint) : constraint;
-                    type.modifiersType = extendedConstraint && extendedConstraint.flags & 1048576 ? instantiateType(extendedConstraint.type, type.mapper || identityMapper) : emptyObjectType;
+                    var extendedConstraint = constraint && constraint.flags & 65536 /* TypeParameter */ ? getConstraintOfTypeParameter(constraint) : constraint;
+                    type.modifiersType = extendedConstraint && extendedConstraint.flags & 1048576 /* Index */ ? instantiateType(extendedConstraint.type, type.mapper || identityMapper) : emptyObjectType;
                 }
             }
             return type.modifiersType;
         }
         function getMappedTypeModifiers(type) {
             var declaration = type.declaration;
-            return (declaration.readonlyToken ? declaration.readonlyToken.kind === 38 ? 2 : 1 : 0) |
-                (declaration.questionToken ? declaration.questionToken.kind === 38 ? 8 : 4 : 0);
+            return (declaration.readonlyToken ? declaration.readonlyToken.kind === 38 /* MinusToken */ ? 2 /* ExcludeReadonly */ : 1 /* IncludeReadonly */ : 0) |
+                (declaration.questionToken ? declaration.questionToken.kind === 38 /* MinusToken */ ? 8 /* ExcludeOptional */ : 4 /* IncludeOptional */ : 0);
         }
         function getMappedTypeOptionality(type) {
             var modifiers = getMappedTypeModifiers(type);
-            return modifiers & 8 ? -1 : modifiers & 4 ? 1 : 0;
+            return modifiers & 8 /* ExcludeOptional */ ? -1 : modifiers & 4 /* IncludeOptional */ ? 1 : 0;
         }
         function getCombinedMappedTypeOptionality(type) {
             var optionality = getMappedTypeOptionality(type);
@@ -28135,47 +35047,51 @@ var ts;
             return optionality || (isGenericMappedType(modifiersType) ? getMappedTypeOptionality(modifiersType) : 0);
         }
         function isPartialMappedType(type) {
-            return !!(ts.getObjectFlags(type) & 32 && getMappedTypeModifiers(type) & 4);
+            return !!(ts.getObjectFlags(type) & 32 /* Mapped */ && getMappedTypeModifiers(type) & 4 /* IncludeOptional */);
         }
         function isGenericMappedType(type) {
-            return !!(ts.getObjectFlags(type) & 32) && isGenericIndexType(getConstraintTypeFromMappedType(type));
+            return !!(ts.getObjectFlags(type) & 32 /* Mapped */) && isGenericIndexType(getConstraintTypeFromMappedType(type));
         }
         function resolveStructuredTypeMembers(type) {
             if (!type.members) {
-                if (type.flags & 131072) {
-                    if (type.objectFlags & 4) {
+                if (type.flags & 131072 /* Object */) {
+                    if (type.objectFlags & 4 /* Reference */) {
                         resolveTypeReferenceMembers(type);
                     }
-                    else if (type.objectFlags & 3) {
+                    else if (type.objectFlags & 3 /* ClassOrInterface */) {
                         resolveClassOrInterfaceMembers(type);
                     }
-                    else if (type.objectFlags & 2048) {
+                    else if (type.objectFlags & 2048 /* ReverseMapped */) {
                         resolveReverseMappedTypeMembers(type);
                     }
-                    else if (type.objectFlags & 16) {
+                    else if (type.objectFlags & 16 /* Anonymous */) {
                         resolveAnonymousTypeMembers(type);
                     }
-                    else if (type.objectFlags & 32) {
+                    else if (type.objectFlags & 32 /* Mapped */) {
                         resolveMappedTypeMembers(type);
                     }
                 }
-                else if (type.flags & 262144) {
+                else if (type.flags & 262144 /* Union */) {
                     resolveUnionTypeMembers(type);
                 }
-                else if (type.flags & 524288) {
+                else if (type.flags & 524288 /* Intersection */) {
                     resolveIntersectionTypeMembers(type);
                 }
             }
             return type;
         }
+        /** Return properties of an object type or an empty array for other types */
         function getPropertiesOfObjectType(type) {
-            if (type.flags & 131072) {
+            if (type.flags & 131072 /* Object */) {
                 return resolveStructuredTypeMembers(type).properties;
             }
             return ts.emptyArray;
         }
+        /** If the given type is an object type and that type has a property by the given name,
+         * return the symbol for that property. Otherwise return undefined.
+         */
         function getPropertyOfObjectType(type, name) {
-            if (type.flags & 131072) {
+            if (type.flags & 131072 /* Object */) {
                 var resolved = resolveStructuredTypeMembers(type);
                 var symbol = resolved.members.get(name);
                 if (symbol && symbolIsValue(symbol)) {
@@ -28197,7 +35113,9 @@ var ts;
                             }
                         }
                     }
-                    if (type.flags & 262144) {
+                    // The properties of a union type are those that are present in all constituent types, so
+                    // we only need to check the properties of the first type
+                    if (type.flags & 262144 /* Union */) {
                         break;
                     }
                 }
@@ -28207,13 +35125,13 @@ var ts;
         }
         function getPropertiesOfType(type) {
             type = getApparentType(type);
-            return type.flags & 786432 ?
+            return type.flags & 786432 /* UnionOrIntersection */ ?
                 getPropertiesOfUnionOrIntersectionType(type) :
                 getPropertiesOfObjectType(type);
         }
         function getAllPossiblePropertiesOfTypes(types) {
             var unionType = getUnionType(types);
-            if (!(unionType.flags & 262144)) {
+            if (!(unionType.flags & 262144 /* Union */)) {
                 return getAugmentedPropertiesOfType(unionType);
             }
             var props = ts.createSymbolTable();
@@ -28223,6 +35141,7 @@ var ts;
                     var escapedName = _b[_a].escapedName;
                     if (!props.has(escapedName)) {
                         var prop = createUnionOrIntersectionProperty(unionType, escapedName);
+                        // May be undefined if the property is private
                         if (prop)
                             props.set(escapedName, prop);
                     }
@@ -28231,9 +35150,9 @@ var ts;
             return ts.arrayFrom(props.values());
         }
         function getConstraintOfType(type) {
-            return type.flags & 65536 ? getConstraintOfTypeParameter(type) :
-                type.flags & 2097152 ? getConstraintOfIndexedAccess(type) :
-                    type.flags & 4194304 ? getConstraintOfConditionalType(type) :
+            return type.flags & 65536 /* TypeParameter */ ? getConstraintOfTypeParameter(type) :
+                type.flags & 2097152 /* IndexedAccess */ ? getConstraintOfIndexedAccess(type) :
+                    type.flags & 4194304 /* Conditional */ ? getConstraintOfConditionalType(type) :
                         getBaseConstraintOfType(type);
         }
         function getConstraintOfTypeParameter(typeParameter) {
@@ -28248,18 +35167,23 @@ var ts;
         function getDefaultConstraintOfConditionalType(type) {
             if (!type.resolvedDefaultConstraint) {
                 var rootTrueType = type.root.trueType;
-                var rootTrueConstraint = rootTrueType.flags & 8388608 ? rootTrueType.substitute : rootTrueType;
+                var rootTrueConstraint = rootTrueType.flags & 8388608 /* Substitution */ ? rootTrueType.substitute : rootTrueType;
                 type.resolvedDefaultConstraint = getUnionType([instantiateType(rootTrueConstraint, type.combinedMapper || type.mapper), getFalseTypeFromConditionalType(type)]);
             }
             return type.resolvedDefaultConstraint;
         }
         function getConstraintOfDistributiveConditionalType(type) {
+            // Check if we have a conditional type of the form 'T extends U ? X : Y', where T is a constrained
+            // type parameter. If so, create an instantiation of the conditional type where T is replaced
+            // with its constraint. We do this because if the constraint is a union type it will be distributed
+            // over the conditional type and possibly reduced. For example, 'T extends undefined ? never : T'
+            // removes 'undefined' from T.
             if (type.root.isDistributive) {
                 var constraint = getConstraintOfType(getSimplifiedType(type.checkType));
                 if (constraint) {
                     var mapper = makeUnaryTypeMapper(type.root.checkType, constraint);
                     var instantiated = getConditionalTypeInstantiation(type, combineTypeMappers(mapper, type.mapper));
-                    if (!(instantiated.flags & 32768)) {
+                    if (!(instantiated.flags & 32768 /* Never */)) {
                         return instantiated;
                     }
                 }
@@ -28274,27 +35198,35 @@ var ts;
             var hasDisjointDomainType = false;
             for (var _i = 0, _a = type.types; _i < _a.length; _i++) {
                 var t = _a[_i];
-                if (t.flags & 15794176) {
+                if (t.flags & 15794176 /* Instantiable */) {
+                    // We keep following constraints as long as we have an instantiable type that is known
+                    // not to be circular or infinite (hence we stop on index access types).
                     var constraint = getConstraintOfType(t);
-                    while (constraint && constraint.flags & (65536 | 1048576 | 4194304)) {
+                    while (constraint && constraint.flags & (65536 /* TypeParameter */ | 1048576 /* Index */ | 4194304 /* Conditional */)) {
                         constraint = getConstraintOfType(constraint);
                     }
                     if (constraint) {
-                        if (!(constraint.flags & 262144)) {
+                        // A constraint that isn't a union type implies that the final type would be a non-union
+                        // type as well. Since non-union constraints are of no interest, we can exit here.
+                        if (!(constraint.flags & 262144 /* Union */)) {
                             return undefined;
                         }
                         constraints = ts.append(constraints, constraint);
                     }
                 }
-                else if (t.flags & 16809468) {
+                else if (t.flags & 16809468 /* DisjointDomains */) {
                     hasDisjointDomainType = true;
                 }
             }
+            // If the target is a union type or if we are intersecting with types belonging to one of the
+            // disjoint domans, we may end up producing a constraint that hasn't been examined before.
             if (constraints && (targetIsUnion || hasDisjointDomainType)) {
                 if (hasDisjointDomainType) {
+                    // We add any types belong to one of the disjoint domans because they might cause the final
+                    // intersection operation to reduce the union constraints.
                     for (var _b = 0, _c = type.types; _b < _c.length; _b++) {
                         var t = _c[_b];
-                        if (t.flags & 16809468) {
+                        if (t.flags & 16809468 /* DisjointDomains */) {
                             constraints = ts.append(constraints, t);
                         }
                     }
@@ -28304,7 +35236,7 @@ var ts;
             return undefined;
         }
         function getBaseConstraintOfInstantiableNonPrimitiveUnionOrIntersection(type) {
-            if (type.flags & (14745600 | 786432)) {
+            if (type.flags & (14745600 /* InstantiableNonPrimitive */ | 786432 /* UnionOrIntersection */)) {
                 var constraint = getResolvedBaseConstraint(type);
                 if (constraint !== noConstraintType && constraint !== circularConstraintType) {
                     return constraint;
@@ -28313,17 +35245,26 @@ var ts;
         }
         function getBaseConstraintOfType(type) {
             var constraint = getBaseConstraintOfInstantiableNonPrimitiveUnionOrIntersection(type);
-            if (!constraint && type.flags & 1048576) {
+            if (!constraint && type.flags & 1048576 /* Index */) {
                 return keyofConstraintType;
             }
             return constraint;
         }
+        /**
+         * This is similar to `getBaseConstraintOfType` except it returns the input type if there's no base constraint, instead of `undefined`
+         * It also doesn't map indexes to `string`, as where this is used this would be unneeded (and likely undesirable)
+         */
         function getBaseConstraintOrType(type) {
             return getBaseConstraintOfType(type) || type;
         }
         function hasNonCircularBaseConstraint(type) {
             return getResolvedBaseConstraint(type) !== circularConstraintType;
         }
+        /**
+         * Return the resolved base constraint of a type variable. The noConstraintType singleton is returned if the
+         * type variable has no constraint, and the circularConstraintType singleton is returned if the constraint
+         * circularly references the type variable.
+         */
         function getResolvedBaseConstraint(type) {
             var circular;
             if (!type.resolvedBaseConstraint) {
@@ -28332,7 +35273,7 @@ var ts;
             }
             return type.resolvedBaseConstraint;
             function getBaseConstraint(t) {
-                if (!pushTypeResolution(t, 4)) {
+                if (!pushTypeResolution(t, 4 /* ResolvedBaseConstraint */)) {
                     circular = true;
                     return undefined;
                 }
@@ -28344,13 +35285,13 @@ var ts;
                 return result;
             }
             function computeBaseConstraint(t) {
-                if (t.flags & 65536) {
+                if (t.flags & 65536 /* TypeParameter */) {
                     var constraint = getConstraintFromTypeParameter(t);
                     return t.isThisType || !constraint ?
                         constraint :
                         getBaseConstraint(constraint);
                 }
-                if (t.flags & 786432) {
+                if (t.flags & 786432 /* UnionOrIntersection */) {
                     var types = t.types;
                     var baseTypes = [];
                     for (var _i = 0, types_4 = types; _i < types_4.length; _i++) {
@@ -28360,24 +35301,24 @@ var ts;
                             baseTypes.push(baseType);
                         }
                     }
-                    return t.flags & 262144 && baseTypes.length === types.length ? getUnionType(baseTypes) :
-                        t.flags & 524288 && baseTypes.length ? getIntersectionType(baseTypes) :
+                    return t.flags & 262144 /* Union */ && baseTypes.length === types.length ? getUnionType(baseTypes) :
+                        t.flags & 524288 /* Intersection */ && baseTypes.length ? getIntersectionType(baseTypes) :
                             undefined;
                 }
-                if (t.flags & 1048576) {
+                if (t.flags & 1048576 /* Index */) {
                     return keyofConstraintType;
                 }
-                if (t.flags & 2097152) {
+                if (t.flags & 2097152 /* IndexedAccess */) {
                     var baseObjectType = getBaseConstraint(t.objectType);
                     var baseIndexType = getBaseConstraint(t.indexType);
                     var baseIndexedAccess = baseObjectType && baseIndexType ? getIndexedAccessType(baseObjectType, baseIndexType) : undefined;
                     return baseIndexedAccess && baseIndexedAccess !== errorType ? getBaseConstraint(baseIndexedAccess) : undefined;
                 }
-                if (t.flags & 4194304) {
+                if (t.flags & 4194304 /* Conditional */) {
                     var constraint = getConstraintOfConditionalType(t);
                     return constraint && getBaseConstraint(constraint);
                 }
-                if (t.flags & 8388608) {
+                if (t.flags & 8388608 /* Substitution */) {
                     return getBaseConstraint(t.substitute);
                 }
                 if (isGenericMappedType(t)) {
@@ -28387,7 +35328,7 @@ var ts;
             }
         }
         function getApparentTypeOfIntersectionType(type) {
-            return type.resolvedApparentType || (type.resolvedApparentType = getTypeWithThisArgument(type, type, true));
+            return type.resolvedApparentType || (type.resolvedApparentType = getTypeWithThisArgument(type, type, /*apparentType*/ true));
         }
         function getResolvedTypeParameterDefault(typeParameter) {
             if (!typeParameter.default) {
@@ -28396,19 +35337,29 @@ var ts;
                     typeParameter.default = targetDefault ? instantiateType(targetDefault, typeParameter.mapper) : noConstraintType;
                 }
                 else {
+                    // To block recursion, set the initial value to the resolvingDefaultType.
                     typeParameter.default = resolvingDefaultType;
                     var defaultDeclaration = typeParameter.symbol && ts.forEach(typeParameter.symbol.declarations, function (decl) { return ts.isTypeParameterDeclaration(decl) && decl.default; });
                     var defaultType = defaultDeclaration ? getTypeFromTypeNode(defaultDeclaration) : noConstraintType;
                     if (typeParameter.default === resolvingDefaultType) {
+                        // If we have not been called recursively, set the correct default type.
                         typeParameter.default = defaultType;
                     }
                 }
             }
             else if (typeParameter.default === resolvingDefaultType) {
+                // If we are called recursively for this type parameter, mark the default as circular.
                 typeParameter.default = circularConstraintType;
             }
             return typeParameter.default;
         }
+        /**
+         * Gets the default type for a type parameter.
+         *
+         * If the type parameter is the result of an instantiation, this gets the instantiated
+         * default type of its target. If the type parameter has no default type or the default is
+         * circular, `undefined` is returned.
+         */
         function getDefaultFromTypeParameter(typeParameter) {
             var defaultType = getResolvedTypeParameterDefault(typeParameter);
             return defaultType !== noConstraintType && defaultType !== circularConstraintType ? defaultType : undefined;
@@ -28416,26 +35367,35 @@ var ts;
         function hasNonCircularTypeParameterDefault(typeParameter) {
             return getResolvedTypeParameterDefault(typeParameter) !== circularConstraintType;
         }
+        /**
+         * Indicates whether the declaration of a typeParameter has a default type.
+         */
         function hasTypeParameterDefault(typeParameter) {
             return !!(typeParameter.symbol && ts.forEach(typeParameter.symbol.declarations, function (decl) { return ts.isTypeParameterDeclaration(decl) && decl.default; }));
         }
+        /**
+         * For a type parameter, return the base constraint of the type parameter. For the string, number,
+         * boolean, and symbol primitive types, return the corresponding object types. Otherwise return the
+         * type itself. Note that the apparent type of a union type is the union type itself.
+         */
         function getApparentType(type) {
-            var t = type.flags & 15794176 ? getBaseConstraintOfType(type) || emptyObjectType : type;
-            return t.flags & 524288 ? getApparentTypeOfIntersectionType(t) :
-                t.flags & 68 ? globalStringType :
-                    t.flags & 168 ? globalNumberType :
-                        t.flags & 272 ? globalBooleanType :
-                            t.flags & 3072 ? getGlobalESSymbolType(languageVersion >= 2) :
-                                t.flags & 16777216 ? emptyObjectType :
-                                    t.flags & 1048576 ? keyofConstraintType :
+            var t = type.flags & 15794176 /* Instantiable */ ? getBaseConstraintOfType(type) || emptyObjectType : type;
+            return t.flags & 524288 /* Intersection */ ? getApparentTypeOfIntersectionType(t) :
+                t.flags & 68 /* StringLike */ ? globalStringType :
+                    t.flags & 168 /* NumberLike */ ? globalNumberType :
+                        t.flags & 272 /* BooleanLike */ ? globalBooleanType :
+                            t.flags & 3072 /* ESSymbolLike */ ? getGlobalESSymbolType(/*reportErrors*/ languageVersion >= 2 /* ES2015 */) :
+                                t.flags & 16777216 /* NonPrimitive */ ? emptyObjectType :
+                                    t.flags & 1048576 /* Index */ ? keyofConstraintType :
                                         t;
         }
         function createUnionOrIntersectionProperty(containingType, name) {
             var props;
-            var isUnion = containingType.flags & 262144;
-            var excludeModifiers = isUnion ? 24 : 0;
-            var commonFlags = isUnion ? 0 : 16777216;
-            var syntheticFlag = 4;
+            var isUnion = containingType.flags & 262144 /* Union */;
+            var excludeModifiers = isUnion ? 24 /* NonPublicAccessibilityModifier */ : 0;
+            // Flags we want to propagate to the result if they exist in all source symbols
+            var commonFlags = isUnion ? 0 /* None */ : 16777216 /* Optional */;
+            var syntheticFlag = 4 /* SyntheticMethod */;
             var checkFlags = 0;
             for (var _i = 0, _a = containingType.types; _i < _a.length; _i++) {
                 var current = _a[_i];
@@ -28446,24 +35406,24 @@ var ts;
                     if (prop && !(modifiers & excludeModifiers)) {
                         commonFlags &= prop.flags;
                         props = ts.appendIfUnique(props, prop);
-                        checkFlags |= (isReadonlySymbol(prop) ? 8 : 0) |
-                            (!(modifiers & 24) ? 64 : 0) |
-                            (modifiers & 16 ? 128 : 0) |
-                            (modifiers & 8 ? 256 : 0) |
-                            (modifiers & 32 ? 512 : 0);
+                        checkFlags |= (isReadonlySymbol(prop) ? 8 /* Readonly */ : 0) |
+                            (!(modifiers & 24 /* NonPublicAccessibilityModifier */) ? 64 /* ContainsPublic */ : 0) |
+                            (modifiers & 16 /* Protected */ ? 128 /* ContainsProtected */ : 0) |
+                            (modifiers & 8 /* Private */ ? 256 /* ContainsPrivate */ : 0) |
+                            (modifiers & 32 /* Static */ ? 512 /* ContainsStatic */ : 0);
                         if (!isPrototypeProperty(prop)) {
-                            syntheticFlag = 2;
+                            syntheticFlag = 2 /* SyntheticProperty */;
                         }
                     }
                     else if (isUnion) {
-                        checkFlags |= 16;
+                        checkFlags |= 16 /* Partial */;
                     }
                 }
             }
             if (!props) {
                 return undefined;
             }
-            if (props.length === 1 && !(checkFlags & 16)) {
+            if (props.length === 1 && !(checkFlags & 16 /* Partial */)) {
                 return props[0];
             }
             var declarations;
@@ -28490,12 +35450,12 @@ var ts;
                 }
                 else {
                     if (type !== commonType) {
-                        checkFlags |= 32;
+                        checkFlags |= 32 /* HasNonUniformType */;
                     }
                 }
                 propTypes.push(type);
             }
-            var result = createSymbol(4 | commonFlags, name, syntheticFlag | checkFlags);
+            var result = createSymbol(4 /* Property */ | commonFlags, name, syntheticFlag | checkFlags);
             result.containingType = containingType;
             if (!hasNonUniformValueDeclaration && commonValueDeclaration) {
                 result.valueDeclaration = commonValueDeclaration;
@@ -28505,6 +35465,11 @@ var ts;
             result.type = isUnion ? getUnionType(propTypes) : getIntersectionType(propTypes);
             return result;
         }
+        // Return the symbol for a given property in a union or intersection type, or undefined if the property
+        // does not exist in any constituent type. Note that the returned property may only be present in some
+        // constituents, in which case the isPartial flag is set when the containing type is union type. We need
+        // these partial properties when identifying discriminant properties, but otherwise they are filtered out
+        // and do not appear to be present in the union type.
         function getUnionOrIntersectionProperty(type, name) {
             var properties = type.propertyCache || (type.propertyCache = ts.createSymbolTable());
             var property = properties.get(name);
@@ -28518,11 +35483,20 @@ var ts;
         }
         function getPropertyOfUnionOrIntersectionType(type, name) {
             var property = getUnionOrIntersectionProperty(type, name);
-            return property && !(ts.getCheckFlags(property) & 16) ? property : undefined;
+            // We need to filter out partial properties in union types
+            return property && !(ts.getCheckFlags(property) & 16 /* Partial */) ? property : undefined;
         }
+        /**
+         * Return the symbol for the property with the given name in the given type. Creates synthetic union properties when
+         * necessary, maps primitive types and type parameters are to their apparent types, and augments with properties from
+         * Object and Function as appropriate.
+         *
+         * @param type a type to look up property from
+         * @param name a name of property to look up in a given type
+         */
         function getPropertyOfType(type, name) {
             type = getApparentType(type);
-            if (type.flags & 131072) {
+            if (type.flags & 131072 /* Object */) {
                 var resolved = resolveStructuredTypeMembers(type);
                 var symbol = resolved.members.get(name);
                 if (symbol && symbolIsValue(symbol)) {
@@ -28536,34 +35510,42 @@ var ts;
                 }
                 return getPropertyOfObjectType(globalObjectType, name);
             }
-            if (type.flags & 786432) {
+            if (type.flags & 786432 /* UnionOrIntersection */) {
                 return getPropertyOfUnionOrIntersectionType(type, name);
             }
             return undefined;
         }
         function getSignaturesOfStructuredType(type, kind) {
-            if (type.flags & 917504) {
+            if (type.flags & 917504 /* StructuredType */) {
                 var resolved = resolveStructuredTypeMembers(type);
-                return kind === 0 ? resolved.callSignatures : resolved.constructSignatures;
+                return kind === 0 /* Call */ ? resolved.callSignatures : resolved.constructSignatures;
             }
             return ts.emptyArray;
         }
+        /**
+         * Return the signatures of the given kind in the given type. Creates synthetic union signatures when necessary and
+         * maps primitive types and type parameters are to their apparent types.
+         */
         function getSignaturesOfType(type, kind) {
             return getSignaturesOfStructuredType(getApparentType(type), kind);
         }
         function getIndexInfoOfStructuredType(type, kind) {
-            if (type.flags & 917504) {
+            if (type.flags & 917504 /* StructuredType */) {
                 var resolved = resolveStructuredTypeMembers(type);
-                return kind === 0 ? resolved.stringIndexInfo : resolved.numberIndexInfo;
+                return kind === 0 /* String */ ? resolved.stringIndexInfo : resolved.numberIndexInfo;
             }
         }
         function getIndexTypeOfStructuredType(type, kind) {
             var info = getIndexInfoOfStructuredType(type, kind);
             return info && info.type;
         }
+        // Return the indexing info of the given kind in the given type. Creates synthetic union index types when necessary and
+        // maps primitive types and type parameters are to their apparent types.
         function getIndexInfoOfType(type, kind) {
             return getIndexInfoOfStructuredType(getApparentType(type), kind);
         }
+        // Return the index type of the given kind in the given type. Creates synthetic union index types when necessary and
+        // maps primitive types and type parameters are to their apparent types.
         function getIndexTypeOfType(type, kind) {
             return getIndexTypeOfStructuredType(getApparentType(type), kind);
         }
@@ -28572,16 +35554,18 @@ var ts;
                 var propTypes = [];
                 for (var _i = 0, _a = getPropertiesOfType(type); _i < _a.length; _i++) {
                     var prop = _a[_i];
-                    if (kind === 0 || isNumericLiteralName(prop.escapedName)) {
+                    if (kind === 0 /* String */ || isNumericLiteralName(prop.escapedName)) {
                         propTypes.push(getTypeOfSymbol(prop));
                     }
                 }
                 if (propTypes.length) {
-                    return getUnionType(propTypes, 2);
+                    return getUnionType(propTypes, 2 /* Subtype */);
                 }
             }
             return undefined;
         }
+        // Return list of type parameters with duplicates removed (duplicate identifier errors are generated in the actual
+        // type checking functions).
         function getTypeParametersFromDeclaration(declaration) {
             var result;
             for (var _i = 0, _a = ts.getEffectiveTypeParameterDeclarations(declaration); _i < _a.length; _i++) {
@@ -28600,17 +35584,20 @@ var ts;
             return result;
         }
         function isJSDocOptionalParameter(node) {
-            return ts.isInJavaScriptFile(node) && (node.type && node.type.kind === 283
+            return ts.isInJavaScriptFile(node) && (
+            // node.type should only be a JSDocOptionalType when node is a parameter of a JSDocFunctionType
+            node.type && node.type.kind === 283 /* JSDocOptionalType */
                 || ts.getJSDocParameterTags(node).some(function (_a) {
                     var isBracketed = _a.isBracketed, typeExpression = _a.typeExpression;
-                    return isBracketed || !!typeExpression && typeExpression.type.kind === 283;
+                    return isBracketed || !!typeExpression && typeExpression.type.kind === 283 /* JSDocOptionalType */;
                 }));
         }
         function tryFindAmbientModule(moduleName, withAugmentations) {
             if (ts.isExternalModuleNameRelative(moduleName)) {
                 return undefined;
             }
-            var symbol = getSymbol(globals, '"' + moduleName + '"', 512);
+            var symbol = getSymbol(globals, '"' + moduleName + '"', 512 /* ValueModule */);
+            // merged symbol is module declaration symbol combined with all augmentations
             return symbol && withAugmentations ? getMergedSymbol(symbol) : symbol;
         }
         function isOptionalParameter(node) {
@@ -28636,24 +35623,29 @@ var ts;
                 return false;
             }
             var isBracketed = node.isBracketed, typeExpression = node.typeExpression;
-            return isBracketed || !!typeExpression && typeExpression.type.kind === 283;
+            return isBracketed || !!typeExpression && typeExpression.type.kind === 283 /* JSDocOptionalType */;
         }
         function createTypePredicateFromTypePredicateNode(node) {
             var parameterName = node.parameterName;
             var type = getTypeFromTypeNode(node.type);
-            if (parameterName.kind === 71) {
-                return createIdentifierTypePredicate(parameterName && parameterName.escapedText, parameterName && getTypePredicateParameterIndex(node.parent.parameters, parameterName), type);
+            if (parameterName.kind === 71 /* Identifier */) {
+                return createIdentifierTypePredicate(parameterName && parameterName.escapedText, // TODO: GH#18217
+                parameterName && getTypePredicateParameterIndex(node.parent.parameters, parameterName), type);
             }
             else {
                 return createThisTypePredicate(type);
             }
         }
         function createIdentifierTypePredicate(parameterName, parameterIndex, type) {
-            return { kind: 1, parameterName: parameterName, parameterIndex: parameterIndex, type: type };
+            return { kind: 1 /* Identifier */, parameterName: parameterName, parameterIndex: parameterIndex, type: type };
         }
         function createThisTypePredicate(type) {
-            return { kind: 0, type: type };
+            return { kind: 0 /* This */, type: type };
         }
+        /**
+         * Gets the minimum number of type arguments needed to satisfy all non-optional type
+         * parameters.
+         */
         function getMinTypeArgumentCount(typeParameters) {
             var minTypeArgumentCount = 0;
             if (typeParameters) {
@@ -28673,6 +35665,9 @@ var ts;
                     if (!typeArguments) {
                         typeArguments = [];
                     }
+                    // Map an unsatisfied type parameter with a default type.
+                    // If a type parameter does not have a default type, or if the default type
+                    // is a forward reference, the empty object type is used.
                     for (var i = numTypeArguments; i < numTypeParameters; i++) {
                         typeArguments[i] = getDefaultTypeArgumentType(isJavaScriptImplicitAny);
                     }
@@ -28704,12 +35699,16 @@ var ts;
                     ts.isValueSignatureDeclaration(declaration) &&
                     !ts.hasJSDocParameterTags(declaration) &&
                     !ts.getJSDocType(declaration);
+                // If this is a JSDoc construct signature, then skip the first parameter in the
+                // parameter list.  The first parameter represents the return type of the construct
+                // signature.
                 for (var i = isJSConstructSignature ? 1 : 0; i < declaration.parameters.length; i++) {
                     var param = declaration.parameters[i];
                     var paramSymbol = param.symbol;
                     var type = ts.isJSDocParameterTag(param) ? (param.typeExpression && param.typeExpression.type) : param.type;
-                    if (paramSymbol && !!(paramSymbol.flags & 4) && !ts.isBindingPattern(param.name)) {
-                        var resolvedSymbol = resolveName(param, paramSymbol.escapedName, 67216319, undefined, undefined, false);
+                    // Include parameter symbol instead of property symbol in the signature
+                    if (paramSymbol && !!(paramSymbol.flags & 4 /* Property */) && !ts.isBindingPattern(param.name)) {
+                        var resolvedSymbol = resolveName(param, paramSymbol.escapedName, 67216319 /* Value */, undefined, undefined, /*isUse*/ false);
                         paramSymbol = resolvedSymbol;
                     }
                     if (i === 0 && paramSymbol.escapedName === "this") {
@@ -28719,9 +35718,10 @@ var ts;
                     else {
                         parameters.push(paramSymbol);
                     }
-                    if (type && type.kind === 178) {
+                    if (type && type.kind === 178 /* LiteralType */) {
                         hasLiteralTypes = true;
                     }
+                    // Record a new minimum argument count if this is not an optional parameter
                     var isOptionalParameter_1 = isOptionalJSDocParameterTag(param) ||
                         param.initializer || param.questionToken || param.dotDotDotToken ||
                         iife && parameters.length > iife.arguments.length && !type ||
@@ -28731,25 +35731,32 @@ var ts;
                         minArgumentCount = parameters.length;
                     }
                 }
-                if ((declaration.kind === 156 || declaration.kind === 157) &&
+                // If only one accessor includes a this-type annotation, the other behaves as if it had the same type annotation
+                if ((declaration.kind === 156 /* GetAccessor */ || declaration.kind === 157 /* SetAccessor */) &&
                     !hasNonBindableDynamicName(declaration) &&
                     (!hasThisParameter || !thisParameter)) {
-                    var otherKind = declaration.kind === 156 ? 157 : 156;
+                    var otherKind = declaration.kind === 156 /* GetAccessor */ ? 157 /* SetAccessor */ : 156 /* GetAccessor */;
                     var other = ts.getDeclarationOfKind(getSymbolOfNode(declaration), otherKind);
                     if (other) {
                         thisParameter = getAnnotatedAccessorThisParameter(other);
                     }
                 }
-                var classType = declaration.kind === 155 ?
+                var classType = declaration.kind === 155 /* Constructor */ ?
                     getDeclaredTypeOfClassOrInterface(getMergedSymbol(declaration.parent.symbol))
                     : undefined;
                 var typeParameters = classType ? classType.localTypeParameters : getTypeParametersFromDeclaration(declaration);
                 var returnType = getSignatureReturnTypeFromDeclaration(declaration, isJSConstructSignature, classType);
                 var hasRestLikeParameter = ts.hasRestParameter(declaration) || ts.isInJavaScriptFile(declaration) && maybeAddJsSyntheticRestParameter(declaration, parameters);
-                links.resolvedSignature = createSignature(declaration, typeParameters, thisParameter, parameters, returnType, undefined, minArgumentCount, hasRestLikeParameter, hasLiteralTypes);
+                links.resolvedSignature = createSignature(declaration, typeParameters, thisParameter, parameters, returnType, /*resolvedTypePredicate*/ undefined, minArgumentCount, hasRestLikeParameter, hasLiteralTypes);
             }
             return links.resolvedSignature;
         }
+        /**
+         * A JS function gets a synthetic rest parameter if it references `arguments` AND:
+         * 1. It has no parameters but at least one `@param` with a type that starts with `...`
+         * OR
+         * 2. It has at least one parameter, and the last parameter has a matching `@param` with a type that starts with `...`
+         */
         function maybeAddJsSyntheticRestParameter(declaration, parameters) {
             if (ts.isJSDocSignature(declaration) || !containsArgumentsReference(declaration)) {
                 return false;
@@ -28759,10 +35766,11 @@ var ts;
             var lastParamVariadicType = ts.firstDefined(lastParamTags, function (p) {
                 return p.typeExpression && ts.isJSDocVariadicType(p.typeExpression.type) ? p.typeExpression.type : undefined;
             });
-            var syntheticArgsSymbol = createSymbol(3, "args");
+            var syntheticArgsSymbol = createSymbol(3 /* Variable */, "args");
             syntheticArgsSymbol.type = lastParamVariadicType ? createArrayType(getTypeFromTypeNode(lastParamVariadicType.type)) : anyArrayType;
             syntheticArgsSymbol.isRestParameter = true;
             if (lastParamVariadicType) {
+                // Replace the last parameter with a rest parameter.
                 parameters.pop();
             }
             parameters.push(syntheticArgsSymbol);
@@ -28770,7 +35778,7 @@ var ts;
         }
         function getSignatureReturnTypeFromDeclaration(declaration, isJSConstructSignature, classType) {
             if (isJSConstructSignature) {
-                return getTypeFromTypeNode(declaration.parameters[0].type);
+                return getTypeFromTypeNode(declaration.parameters[0].type); // TODO: GH#18217
             }
             else if (classType) {
                 return classType;
@@ -28779,8 +35787,10 @@ var ts;
             if (typeNode) {
                 return getTypeFromTypeNode(typeNode);
             }
-            if (declaration.kind === 156 && !hasNonBindableDynamicName(declaration)) {
-                var setter = ts.getDeclarationOfKind(getSymbolOfNode(declaration), 157);
+            // TypeScript 1.0 spec (April 2014):
+            // If only one accessor includes a type annotation, the other behaves as if it had the same type annotation.
+            if (declaration.kind === 156 /* GetAccessor */ && !hasNonBindableDynamicName(declaration)) {
+                var setter = ts.getDeclarationOfKind(getSymbolOfNode(declaration), 157 /* SetAccessor */);
                 return getAnnotatedAccessorType(setter);
             }
             if (ts.nodeIsMissing(declaration.body)) {
@@ -28790,7 +35800,7 @@ var ts;
         function containsArgumentsReference(declaration) {
             var links = getNodeLinks(declaration);
             if (links.containsArgumentsReference === undefined) {
-                if (links.flags & 8192) {
+                if (links.flags & 8192 /* CaptureArguments */) {
                     links.containsArgumentsReference = true;
                 }
                 else {
@@ -28802,13 +35812,13 @@ var ts;
                 if (!node)
                     return false;
                 switch (node.kind) {
-                    case 71:
+                    case 71 /* Identifier */:
                         return node.escapedText === "arguments" && ts.isExpressionNode(node);
-                    case 152:
-                    case 154:
-                    case 156:
-                    case 157:
-                        return node.name.kind === 147
+                    case 152 /* PropertyDeclaration */:
+                    case 154 /* MethodDeclaration */:
+                    case 156 /* GetAccessor */:
+                    case 157 /* SetAccessor */:
+                        return node.name.kind === 147 /* ComputedPropertyName */
                             && traverse(node.name);
                     default:
                         return !ts.nodeStartsNewLexicalEnvironment(node) && !ts.isPartOfTypeNode(node) && !!ts.forEachChild(node, traverse);
@@ -28823,6 +35833,9 @@ var ts;
                 var decl = symbol.declarations[i];
                 if (!ts.isFunctionLike(decl))
                     continue;
+                // Don't include signature if node is the implementation of an overloaded function. A node is considered
+                // an implementation node if it has a body and the previous node is of the same kind and immediately
+                // precedes the implementation node (i.e. has the same parent and ends where the implementation starts).
                 if (i > 0 && decl.body) {
                     var previous = symbol.declarations[i - 1];
                     if (decl.parent === previous.parent && decl.kind === previous.kind && decl.pos === previous.end) {
@@ -28862,7 +35875,7 @@ var ts;
                 }
                 else {
                     var declaration = signature.declaration;
-                    signature.resolvedTypePredicate = declaration && declaration.type && declaration.type.kind === 161 ?
+                    signature.resolvedTypePredicate = declaration && declaration.type && declaration.type.kind === 161 /* TypePredicate */ ?
                         createTypePredicateFromTypePredicateNode(declaration.type) :
                         noTypePredicate;
                 }
@@ -28872,7 +35885,7 @@ var ts;
         }
         function getReturnTypeOfSignature(signature) {
             if (!signature.resolvedReturnType) {
-                if (!pushTypeResolution(signature, 3)) {
+                if (!pushTypeResolution(signature, 3 /* ResolvedReturnType */)) {
                     return errorType;
                 }
                 var type = void 0;
@@ -28880,7 +35893,7 @@ var ts;
                     type = instantiateType(getReturnTypeOfSignature(signature.target), signature.mapper);
                 }
                 else if (signature.unionSignatures) {
-                    type = getUnionType(ts.map(signature.unionSignatures, getReturnTypeOfSignature), 2);
+                    type = getUnionType(ts.map(signature.unionSignatures, getReturnTypeOfSignature), 2 /* Subtype */);
                 }
                 else {
                     type = getReturnTypeFromBody(signature.declaration);
@@ -28903,12 +35916,12 @@ var ts;
             return signature.resolvedReturnType;
         }
         function isResolvingReturnTypeOfSignature(signature) {
-            return !signature.resolvedReturnType && findResolutionCycleStartIndex(signature, 3) >= 0;
+            return !signature.resolvedReturnType && findResolutionCycleStartIndex(signature, 3 /* ResolvedReturnType */) >= 0;
         }
         function getRestTypeOfSignature(signature) {
             if (signature.hasRestParameter) {
                 var type = getTypeOfSymbol(ts.last(signature.parameters));
-                if (ts.getObjectFlags(type) & 4 && type.target === globalArrayType) {
+                if (ts.getObjectFlags(type) & 4 /* Reference */ && type.target === globalArrayType) {
                     return type.typeArguments[0];
                 }
             }
@@ -28925,7 +35938,7 @@ var ts;
             return instantiation;
         }
         function createSignatureInstantiation(signature, typeArguments) {
-            return instantiateSignature(signature, createSignatureTypeMapper(signature, typeArguments), true);
+            return instantiateSignature(signature, createSignatureTypeMapper(signature, typeArguments), /*eraseTypeParameters*/ true);
         }
         function createSignatureTypeMapper(signature, typeArguments) {
             return createTypeMapper(signature.typeParameters, typeArguments);
@@ -28936,7 +35949,8 @@ var ts;
                 signature;
         }
         function createErasedSignature(signature) {
-            return instantiateSignature(signature, createTypeEraser(signature.typeParameters), true);
+            // Create an instantiation of the signature where all type arguments are the any type.
+            return instantiateSignature(signature, createTypeEraser(signature.typeParameters), /*eraseTypeParameters*/ true);
         }
         function getCanonicalSignature(signature) {
             return signature.typeParameters ?
@@ -28944,6 +35958,12 @@ var ts;
                 signature;
         }
         function createCanonicalSignature(signature) {
+            // Create an instantiation of the signature where each unconstrained type parameter is replaced with
+            // its original. When a generic class or interface is instantiated, each generic method in the class or
+            // interface is instantiated with a fresh set of cloned type parameters (which we need to handle scenarios
+            // where different generations of the same type parameter are in scope). This leads to a lot of new type
+            // identities, and potentially a lot of work comparing those identities, so here we create an instantiation
+            // that uses the original type identities for all unconstrained type parameters.
             return getSignatureInstantiation(signature, ts.map(signature.typeParameters, function (tp) { return tp.target && !getConstraintOfTypeParameter(tp.target) ? tp.target : tp; }), ts.isInJavaScriptFile(signature.declaration));
         }
         function getBaseSignature(signature) {
@@ -28951,14 +35971,18 @@ var ts;
             if (typeParameters) {
                 var typeEraser_1 = createTypeEraser(typeParameters);
                 var baseConstraints = ts.map(typeParameters, function (tp) { return instantiateType(getBaseConstraintOfType(tp), typeEraser_1) || emptyObjectType; });
-                return instantiateSignature(signature, createTypeMapper(typeParameters, baseConstraints), true);
+                return instantiateSignature(signature, createTypeMapper(typeParameters, baseConstraints), /*eraseTypeParameters*/ true);
             }
             return signature;
         }
         function getOrCreateTypeFromSignature(signature) {
+            // There are two ways to declare a construct signature, one is by declaring a class constructor
+            // using the constructor keyword, and the other is declaring a bare construct signature in an
+            // object type literal or interface (using the new keyword). Each way of declaring a constructor
+            // will result in a different declaration kind.
             if (!signature.isolatedSignatureType) {
-                var isConstructor = signature.declaration.kind === 155 || signature.declaration.kind === 159;
-                var type = createObjectType(16);
+                var isConstructor = signature.declaration.kind === 155 /* Constructor */ || signature.declaration.kind === 159 /* ConstructSignature */; // TODO: GH#18217
+                var type = createObjectType(16 /* Anonymous */);
                 type.members = emptySymbols;
                 type.properties = ts.emptyArray;
                 type.callSignatures = !isConstructor ? [signature] : ts.emptyArray;
@@ -28968,10 +35992,10 @@ var ts;
             return signature.isolatedSignatureType;
         }
         function getIndexSymbol(symbol) {
-            return symbol.members.get("__index");
+            return symbol.members.get("__index" /* Index */);
         }
         function getIndexDeclarationOfSymbol(symbol, kind) {
-            var syntaxKind = kind === 1 ? 134 : 137;
+            var syntaxKind = kind === 1 /* Number */ ? 134 /* NumberKeyword */ : 137 /* StringKeyword */;
             var indexSymbol = getIndexSymbol(symbol);
             if (indexSymbol) {
                 for (var _i = 0, _a = indexSymbol.declarations; _i < _a.length; _i++) {
@@ -28993,12 +36017,12 @@ var ts;
         function getIndexInfoOfSymbol(symbol, kind) {
             var declaration = getIndexDeclarationOfSymbol(symbol, kind);
             if (declaration) {
-                return createIndexInfo(declaration.type ? getTypeFromTypeNode(declaration.type) : anyType, ts.hasModifier(declaration, 64), declaration);
+                return createIndexInfo(declaration.type ? getTypeFromTypeNode(declaration.type) : anyType, ts.hasModifier(declaration, 64 /* Readonly */), declaration);
             }
             return undefined;
         }
         function getConstraintDeclaration(type) {
-            var decl = type.symbol && ts.getDeclarationOfKind(type.symbol, 148);
+            var decl = type.symbol && ts.getDeclarationOfKind(type.symbol, 148 /* TypeParameter */);
             return decl && decl.constraint;
         }
         function getInferredTypeParameterConstraint(typeParameter) {
@@ -29006,7 +36030,11 @@ var ts;
             if (typeParameter.symbol) {
                 for (var _i = 0, _a = typeParameter.symbol.declarations; _i < _a.length; _i++) {
                     var declaration = _a[_i];
-                    if (declaration.parent.kind === 172 && declaration.parent.parent.kind === 162) {
+                    // When an 'infer T' declaration is immediately contained in a type reference node
+                    // (such as 'Foo<infer T>'), T's constraint is inferred from the constraint of the
+                    // corresponding type parameter in 'Foo'. When multiple 'infer T' declarations are
+                    // present, we form an intersection of the inferred constraint types.
+                    if (declaration.parent.kind === 172 /* InferType */ && declaration.parent.parent.kind === 162 /* TypeReference */) {
                         var typeReference = declaration.parent.parent;
                         var typeParameters = getTypeParametersForTypeReference(typeReference);
                         if (typeParameters) {
@@ -29014,6 +36042,12 @@ var ts;
                             if (index < typeParameters.length) {
                                 var declaredConstraint = getConstraintOfTypeParameter(typeParameters[index]);
                                 if (declaredConstraint) {
+                                    // Type parameter constraints can reference other type parameters so
+                                    // constraints need to be instantiated. If instantiation produces the
+                                    // type parameter itself, we discard that inference. For example, in
+                                    //   type Foo<T extends string, U extends T> = [T, U];
+                                    //   type Bar<T> = T extends Foo<infer X, infer X> ? Foo<X, X> : T;
+                                    // the instantiated constraint for U is X, so we discard that inference.
                                     var mapper = createTypeMapper(typeParameters, getEffectiveTypeArguments(typeReference, typeParameters));
                                     var constraint = instantiateType(declaredConstraint, mapper);
                                     if (constraint !== typeParameter) {
@@ -29042,7 +36076,7 @@ var ts;
             return typeParameter.constraint === noConstraintType ? undefined : typeParameter.constraint;
         }
         function getParentSymbolOfTypeParameter(typeParameter) {
-            return getSymbolOfNode(ts.getDeclarationOfKind(typeParameter.symbol, 148).parent);
+            return getSymbolOfNode(ts.getDeclarationOfKind(typeParameter.symbol, 148 /* TypeParameter */).parent);
         }
         function getTypeListId(types) {
             var result = "";
@@ -29067,6 +36101,10 @@ var ts;
             }
             return result;
         }
+        // This function is used to propagate certain flags when creating new object type references and union types.
+        // It is only necessary to do so if a constituent type might be the undefined type, the null type, the type
+        // of an object literal or the anyFunctionType. This is because there are operations in the type checker
+        // that care about the presence of such types at arbitrary depth in a containing type.
         function getPropagatingFlagsOfTypes(types, excludeKinds) {
             var result = 0;
             for (var _i = 0, types_5 = types; _i < types_5.length; _i++) {
@@ -29075,15 +36113,15 @@ var ts;
                     result |= type.flags;
                 }
             }
-            return result & 939524096;
+            return result & 939524096 /* PropagatingFlags */;
         }
         function createTypeReference(target, typeArguments) {
             var id = getTypeListId(typeArguments);
             var type = target.instantiations.get(id);
             if (!type) {
-                type = createObjectType(4, target.symbol);
+                type = createObjectType(4 /* Reference */, target.symbol);
                 target.instantiations.set(id, type);
-                type.flags |= typeArguments ? getPropagatingFlagsOfTypes(typeArguments, 0) : 0;
+                type.flags |= typeArguments ? getPropagatingFlagsOfTypes(typeArguments, /*excludeKinds*/ 0) : 0;
                 type.target = target;
                 type.typeArguments = typeArguments;
             }
@@ -29100,6 +36138,9 @@ var ts;
         function getTypeReferenceArity(type) {
             return ts.length(type.target.typeParameters);
         }
+        /**
+         * Get type from type-reference that reference to class or interface
+         */
         function getTypeFromClassOrInterfaceReference(node, symbol, typeArgs) {
             var type = getDeclaredTypeOfSymbol(getMergedSymbol(symbol));
             var typeParameters = type.localTypeParameters;
@@ -29109,7 +36150,7 @@ var ts;
                 var isJs = ts.isInJavaScriptFile(node);
                 var isJsImplicitAny = !noImplicitAny && isJs;
                 if (!isJsImplicitAny && (numTypeArguments < minTypeArgumentCount || numTypeArguments > typeParameters.length)) {
-                    var missingAugmentsTag = isJs && node.parent.kind !== 290;
+                    var missingAugmentsTag = isJs && node.parent.kind !== 290 /* JSDocAugmentsTag */;
                     var diag = minTypeArgumentCount === typeParameters.length
                         ? missingAugmentsTag
                             ? ts.Diagnostics.Expected_0_type_arguments_provide_these_with_an_extends_tag
@@ -29117,12 +36158,16 @@ var ts;
                         : missingAugmentsTag
                             ? ts.Diagnostics.Expected_0_1_type_arguments_provide_these_with_an_extends_tag
                             : ts.Diagnostics.Generic_type_0_requires_between_1_and_2_type_arguments;
-                    var typeStr = typeToString(type, undefined, 2);
+                    var typeStr = typeToString(type, /*enclosingDeclaration*/ undefined, 2 /* WriteArrayAsGenericType */);
                     error(node, diag, typeStr, minTypeArgumentCount, typeParameters.length);
                     if (!isJs) {
+                        // TODO: Adopt same permissive behavior in TS as in JS to reduce follow-on editing experience failures (requires editing fillMissingTypeArguments)
                         return errorType;
                     }
                 }
+                // In a type reference, the outer type parameters of the referenced class or interface are automatically
+                // supplied as type arguments and the type reference only specifies arguments for the local type parameters
+                // of the class or interface.
                 var typeArguments = ts.concatenate(type.outerTypeParameters, fillMissingTypeArguments(typeArgs, typeParameters, minTypeArgumentCount, isJs));
                 return createTypeReference(type, typeArguments);
             }
@@ -29139,6 +36184,11 @@ var ts;
             }
             return instantiation;
         }
+        /**
+         * Get type from reference to type alias. When a type alias is generic, the declared type of the type alias may include
+         * references to the type parameters of the alias. We replace those with the actual type arguments by instantiating the
+         * declared type. Instantiations are cached using the type identities of the type arguments as the key.
+         */
         function getTypeFromTypeAliasReference(node, symbol, typeArguments) {
             var type = getDeclaredTypeOfSymbol(symbol);
             var typeParameters = getSymbolLinks(symbol).typeParameters;
@@ -29157,13 +36207,16 @@ var ts;
         }
         function getTypeReferenceName(node) {
             switch (node.kind) {
-                case 162:
+                case 162 /* TypeReference */:
                     return node.typeName;
-                case 207:
+                case 207 /* ExpressionWithTypeArguments */:
+                    // We only support expressions that are simple qualified names. For other
+                    // expressions this produces undefined.
                     var expr = node.expression;
                     if (ts.isEntityNameExpression(expr)) {
                         return expr;
                     }
+                // fall through;
             }
             return undefined;
         }
@@ -29174,7 +36227,7 @@ var ts;
             return resolveEntityName(typeReferenceName, meaning) || unknownSymbol;
         }
         function getTypeReferenceType(node, symbol) {
-            var typeArguments = typeArgumentsFromTypeReferenceNode(node);
+            var typeArguments = typeArgumentsFromTypeReferenceNode(node); // Do unconditionally so we mark type arguments as referenced.
             if (symbol === unknownSymbol) {
                 return errorType;
             }
@@ -29182,32 +36235,40 @@ var ts;
             if (type) {
                 return type;
             }
+            // Get type from reference to named type that cannot be generic (enum or type parameter)
             var res = tryGetDeclaredTypeOfSymbol(symbol);
             if (res) {
                 return checkNoTypeArguments(node, symbol) ?
-                    res.flags & 65536 ? getConstrainedTypeVariable(res, node) : res :
+                    res.flags & 65536 /* TypeParameter */ ? getConstrainedTypeVariable(res, node) : res :
                     errorType;
             }
-            if (!(symbol.flags & 67216319 && isJSDocTypeReference(node))) {
+            if (!(symbol.flags & 67216319 /* Value */ && isJSDocTypeReference(node))) {
                 return errorType;
             }
             var jsdocType = getJSDocTypeReference(node, symbol, typeArguments);
             if (jsdocType) {
                 return jsdocType;
             }
-            resolveTypeReferenceName(getTypeReferenceName(node), 67901928);
+            // Resolve the type reference as a Type for the purpose of reporting errors.
+            resolveTypeReferenceName(getTypeReferenceName(node), 67901928 /* Type */);
             return getTypeOfSymbol(symbol);
         }
+        /**
+         * A jsdoc TypeReference may have resolved to a value (as opposed to a type). If
+         * the symbol is a constructor function, return the inferred class type; otherwise,
+         * the type of this reference is just the type of the value we resolved to.
+         */
         function getJSDocTypeReference(node, symbol, typeArguments) {
             var assignedType = getAssignedClassType(symbol);
             var valueType = getTypeOfSymbol(symbol);
             var referenceType = valueType.symbol && valueType.symbol !== symbol && !isInferredClassType(valueType) && getTypeReferenceTypeWorker(node, valueType.symbol, typeArguments);
             if (referenceType || assignedType) {
+                // TODO: GH#18217 (should the `|| assignedType` be at a lower precedence?)
                 return (referenceType && assignedType ? getIntersectionType([assignedType, referenceType]) : referenceType || assignedType);
             }
         }
         function getTypeReferenceTypeWorker(node, symbol, typeArguments) {
-            if (symbol.flags & (32 | 64)) {
+            if (symbol.flags & (32 /* Class */ | 64 /* Interface */)) {
                 if (symbol.valueDeclaration && ts.isBinaryExpression(symbol.valueDeclaration.parent)) {
                     var jsdocType = getJSDocTypeReference(node, symbol, typeArguments);
                     if (jsdocType) {
@@ -29216,23 +36277,23 @@ var ts;
                 }
                 return getTypeFromClassOrInterfaceReference(node, symbol, typeArguments);
             }
-            if (symbol.flags & 524288) {
+            if (symbol.flags & 524288 /* TypeAlias */) {
                 return getTypeFromTypeAliasReference(node, symbol, typeArguments);
             }
-            if (symbol.flags & 16 &&
+            if (symbol.flags & 16 /* Function */ &&
                 isJSDocTypeReference(node) &&
                 (symbol.members || ts.getJSDocClassTag(symbol.valueDeclaration))) {
                 return getInferredClassType(symbol);
             }
         }
         function getSubstitutionType(typeVariable, substitute) {
-            var result = createType(8388608);
+            var result = createType(8388608 /* Substitution */);
             result.typeVariable = typeVariable;
             result.substitute = substitute;
             return result;
         }
         function isUnaryTupleTypeNode(node) {
-            return node.kind === 168 && node.elementTypes.length === 1;
+            return node.kind === 168 /* TupleType */ && node.elementTypes.length === 1;
         }
         function getImpliedConstraint(typeVariable, checkNode, extendsNode) {
             return isUnaryTupleTypeNode(checkNode) && isUnaryTupleTypeNode(extendsNode) ? getImpliedConstraint(typeVariable, checkNode.elementTypes[0], extendsNode.elementTypes[0]) :
@@ -29241,9 +36302,9 @@ var ts;
         }
         function getConstrainedTypeVariable(typeVariable, node) {
             var constraints;
-            while (node && !ts.isStatement(node) && node.kind !== 286) {
+            while (node && !ts.isStatement(node) && node.kind !== 286 /* JSDocComment */) {
                 var parent = node.parent;
-                if (parent.kind === 171 && node === parent.trueType) {
+                if (parent.kind === 171 /* ConditionalType */ && node === parent.trueType) {
                     var constraint = getImpliedConstraint(typeVariable, parent.checkType, parent.extendsType);
                     if (constraint) {
                         constraints = ts.append(constraints, constraint);
@@ -29254,7 +36315,7 @@ var ts;
             return constraints ? getSubstitutionType(typeVariable, getIntersectionType(ts.append(constraints, typeVariable))) : typeVariable;
         }
         function isJSDocTypeReference(node) {
-            return !!(node.flags & 2097152) && node.kind === 162;
+            return !!(node.flags & 2097152 /* JSDoc */) && node.kind === 162 /* TypeReference */;
         }
         function checkNoTypeArguments(node, symbol) {
             if (node.typeArguments) {
@@ -29300,7 +36361,7 @@ var ts;
                             if (ts.isJSDocIndexSignature(node)) {
                                 var indexed = getTypeFromTypeNode(typeArgs[0]);
                                 var target = getTypeFromTypeNode(typeArgs[1]);
-                                var index = createIndexInfo(target, false);
+                                var index = createIndexInfo(target, /*isReadonly*/ false);
                                 return createAnonymousType(undefined, emptySymbols, ts.emptyArray, ts.emptyArray, indexed === stringType ? index : undefined, indexed === numberType ? index : undefined);
                             }
                             return anyType;
@@ -29312,22 +36373,24 @@ var ts;
         }
         function getTypeFromJSDocNullableTypeNode(node) {
             var type = getTypeFromTypeNode(node.type);
-            return strictNullChecks ? getNullableType(type, 16384) : type;
+            return strictNullChecks ? getNullableType(type, 16384 /* Null */) : type;
         }
         function getTypeFromTypeReference(node) {
             var links = getNodeLinks(node);
             if (!links.resolvedType) {
                 var symbol = void 0;
                 var type = void 0;
-                var meaning = 67901928;
+                var meaning = 67901928 /* Type */;
                 if (isJSDocTypeReference(node)) {
                     type = getIntendedTypeFromJSDocTypeReference(node);
-                    meaning |= 67216319;
+                    meaning |= 67216319 /* Value */;
                 }
                 if (!type) {
                     symbol = resolveTypeReferenceName(getTypeReferenceName(node), meaning);
                     type = getTypeReferenceType(node, symbol);
                 }
+                // Cache both the resolved symbol and the resolved type. The resolved symbol is needed in when we check the
+                // type reference in checkTypeReferenceNode.
                 links.resolvedSymbol = symbol;
                 links.resolvedType = type;
             }
@@ -29339,6 +36402,10 @@ var ts;
         function getTypeFromTypeQueryNode(node) {
             var links = getNodeLinks(node);
             if (!links.resolvedType) {
+                // TypeScript 1.0 spec (April 2014): 3.6.3
+                // The expression is processed as an identifier expression (section 4.3)
+                // or property access expression(section 4.10),
+                // the widened type(section 3.9) of which becomes the result.
                 links.resolvedType = getWidenedType(checkExpression(node.exprName));
             }
             return links.resolvedType;
@@ -29346,12 +36413,12 @@ var ts;
         function getTypeOfGlobalSymbol(symbol, arity) {
             function getTypeDeclaration(symbol) {
                 var declarations = symbol.declarations;
-                for (var _i = 0, declarations_3 = declarations; _i < declarations_3.length; _i++) {
-                    var declaration = declarations_3[_i];
+                for (var _i = 0, declarations_2 = declarations; _i < declarations_2.length; _i++) {
+                    var declaration = declarations_2[_i];
                     switch (declaration.kind) {
-                        case 235:
-                        case 236:
-                        case 238:
+                        case 235 /* ClassDeclaration */:
+                        case 236 /* InterfaceDeclaration */:
+                        case 238 /* EnumDeclaration */:
                             return declaration;
                     }
                 }
@@ -29360,7 +36427,7 @@ var ts;
                 return arity ? emptyGenericType : emptyObjectType;
             }
             var type = getDeclaredTypeOfSymbol(symbol);
-            if (!(type.flags & 131072)) {
+            if (!(type.flags & 131072 /* Object */)) {
                 error(getTypeDeclaration(symbol), ts.Diagnostics.Global_type_0_must_be_a_class_or_interface_type, ts.symbolName(symbol));
                 return arity ? emptyGenericType : emptyObjectType;
             }
@@ -29371,68 +36438,72 @@ var ts;
             return type;
         }
         function getGlobalValueSymbol(name, reportErrors) {
-            return getGlobalSymbol(name, 67216319, reportErrors ? ts.Diagnostics.Cannot_find_global_value_0 : undefined);
+            return getGlobalSymbol(name, 67216319 /* Value */, reportErrors ? ts.Diagnostics.Cannot_find_global_value_0 : undefined);
         }
         function getGlobalTypeSymbol(name, reportErrors) {
-            return getGlobalSymbol(name, 67901928, reportErrors ? ts.Diagnostics.Cannot_find_global_type_0 : undefined);
+            return getGlobalSymbol(name, 67901928 /* Type */, reportErrors ? ts.Diagnostics.Cannot_find_global_type_0 : undefined);
         }
         function getGlobalSymbol(name, meaning, diagnostic) {
-            return resolveName(undefined, name, meaning, diagnostic, name, false);
+            // Don't track references for global symbols anyway, so value if `isReference` is arbitrary
+            return resolveName(undefined, name, meaning, diagnostic, name, /*isUse*/ false);
         }
         function getGlobalType(name, arity, reportErrors) {
             var symbol = getGlobalTypeSymbol(name, reportErrors);
             return symbol || reportErrors ? getTypeOfGlobalSymbol(symbol, arity) : undefined;
         }
         function getGlobalTypedPropertyDescriptorType() {
-            return deferredGlobalTypedPropertyDescriptorType || (deferredGlobalTypedPropertyDescriptorType = getGlobalType("TypedPropertyDescriptor", 1, true)) || emptyGenericType;
+            return deferredGlobalTypedPropertyDescriptorType || (deferredGlobalTypedPropertyDescriptorType = getGlobalType("TypedPropertyDescriptor", /*arity*/ 1, /*reportErrors*/ true)) || emptyGenericType;
         }
         function getGlobalTemplateStringsArrayType() {
-            return deferredGlobalTemplateStringsArrayType || (deferredGlobalTemplateStringsArrayType = getGlobalType("TemplateStringsArray", 0, true)) || emptyObjectType;
+            return deferredGlobalTemplateStringsArrayType || (deferredGlobalTemplateStringsArrayType = getGlobalType("TemplateStringsArray", /*arity*/ 0, /*reportErrors*/ true)) || emptyObjectType;
         }
         function getGlobalImportMetaType() {
-            return deferredGlobalImportMetaType || (deferredGlobalImportMetaType = getGlobalType("ImportMeta", 0, true)) || emptyObjectType;
+            return deferredGlobalImportMetaType || (deferredGlobalImportMetaType = getGlobalType("ImportMeta", /*arity*/ 0, /*reportErrors*/ true)) || emptyObjectType;
         }
         function getGlobalESSymbolConstructorSymbol(reportErrors) {
             return deferredGlobalESSymbolConstructorSymbol || (deferredGlobalESSymbolConstructorSymbol = getGlobalValueSymbol("Symbol", reportErrors));
         }
         function getGlobalESSymbolType(reportErrors) {
-            return deferredGlobalESSymbolType || (deferredGlobalESSymbolType = getGlobalType("Symbol", 0, reportErrors)) || emptyObjectType;
+            return deferredGlobalESSymbolType || (deferredGlobalESSymbolType = getGlobalType("Symbol", /*arity*/ 0, reportErrors)) || emptyObjectType;
         }
         function getGlobalPromiseType(reportErrors) {
-            return deferredGlobalPromiseType || (deferredGlobalPromiseType = getGlobalType("Promise", 1, reportErrors)) || emptyGenericType;
+            return deferredGlobalPromiseType || (deferredGlobalPromiseType = getGlobalType("Promise", /*arity*/ 1, reportErrors)) || emptyGenericType;
         }
         function getGlobalPromiseConstructorSymbol(reportErrors) {
             return deferredGlobalPromiseConstructorSymbol || (deferredGlobalPromiseConstructorSymbol = getGlobalValueSymbol("Promise", reportErrors));
         }
         function getGlobalPromiseConstructorLikeType(reportErrors) {
-            return deferredGlobalPromiseConstructorLikeType || (deferredGlobalPromiseConstructorLikeType = getGlobalType("PromiseConstructorLike", 0, reportErrors)) || emptyObjectType;
+            return deferredGlobalPromiseConstructorLikeType || (deferredGlobalPromiseConstructorLikeType = getGlobalType("PromiseConstructorLike", /*arity*/ 0, reportErrors)) || emptyObjectType;
         }
         function getGlobalAsyncIterableType(reportErrors) {
-            return deferredGlobalAsyncIterableType || (deferredGlobalAsyncIterableType = getGlobalType("AsyncIterable", 1, reportErrors)) || emptyGenericType;
+            return deferredGlobalAsyncIterableType || (deferredGlobalAsyncIterableType = getGlobalType("AsyncIterable", /*arity*/ 1, reportErrors)) || emptyGenericType;
         }
         function getGlobalAsyncIteratorType(reportErrors) {
-            return deferredGlobalAsyncIteratorType || (deferredGlobalAsyncIteratorType = getGlobalType("AsyncIterator", 1, reportErrors)) || emptyGenericType;
+            return deferredGlobalAsyncIteratorType || (deferredGlobalAsyncIteratorType = getGlobalType("AsyncIterator", /*arity*/ 1, reportErrors)) || emptyGenericType;
         }
         function getGlobalAsyncIterableIteratorType(reportErrors) {
-            return deferredGlobalAsyncIterableIteratorType || (deferredGlobalAsyncIterableIteratorType = getGlobalType("AsyncIterableIterator", 1, reportErrors)) || emptyGenericType;
+            return deferredGlobalAsyncIterableIteratorType || (deferredGlobalAsyncIterableIteratorType = getGlobalType("AsyncIterableIterator", /*arity*/ 1, reportErrors)) || emptyGenericType;
         }
         function getGlobalIterableType(reportErrors) {
-            return deferredGlobalIterableType || (deferredGlobalIterableType = getGlobalType("Iterable", 1, reportErrors)) || emptyGenericType;
+            return deferredGlobalIterableType || (deferredGlobalIterableType = getGlobalType("Iterable", /*arity*/ 1, reportErrors)) || emptyGenericType;
         }
         function getGlobalIteratorType(reportErrors) {
-            return deferredGlobalIteratorType || (deferredGlobalIteratorType = getGlobalType("Iterator", 1, reportErrors)) || emptyGenericType;
+            return deferredGlobalIteratorType || (deferredGlobalIteratorType = getGlobalType("Iterator", /*arity*/ 1, reportErrors)) || emptyGenericType;
         }
         function getGlobalIterableIteratorType(reportErrors) {
-            return deferredGlobalIterableIteratorType || (deferredGlobalIterableIteratorType = getGlobalType("IterableIterator", 1, reportErrors)) || emptyGenericType;
+            return deferredGlobalIterableIteratorType || (deferredGlobalIterableIteratorType = getGlobalType("IterableIterator", /*arity*/ 1, reportErrors)) || emptyGenericType;
         }
         function getGlobalTypeOrUndefined(name, arity) {
             if (arity === void 0) { arity = 0; }
-            var symbol = getGlobalSymbol(name, 67901928, undefined);
+            var symbol = getGlobalSymbol(name, 67901928 /* Type */, /*diagnostic*/ undefined);
             return symbol && getTypeOfGlobalSymbol(symbol, arity);
         }
         function getGlobalExtractSymbol() {
-            return deferredGlobalExtractSymbol || (deferredGlobalExtractSymbol = getGlobalSymbol("Extract", 524288, ts.Diagnostics.Cannot_find_global_type_0));
+            return deferredGlobalExtractSymbol || (deferredGlobalExtractSymbol = getGlobalSymbol("Extract", 524288 /* TypeAlias */, ts.Diagnostics.Cannot_find_global_type_0)); // TODO: GH#18217
         }
+        /**
+         * Instantiates a global type that is generic with some element type, and returns that instantiation.
+         */
         function createTypeFromGenericGlobalType(genericGlobalType, typeArguments) {
             return genericGlobalType !== emptyGenericType ? createTypeReference(genericGlobalType, typeArguments) : emptyObjectType;
         }
@@ -29440,16 +36511,16 @@ var ts;
             return createTypeFromGenericGlobalType(getGlobalTypedPropertyDescriptorType(), [propertyType]);
         }
         function createAsyncIterableType(iteratedType) {
-            return createTypeFromGenericGlobalType(getGlobalAsyncIterableType(true), [iteratedType]);
+            return createTypeFromGenericGlobalType(getGlobalAsyncIterableType(/*reportErrors*/ true), [iteratedType]);
         }
         function createAsyncIterableIteratorType(iteratedType) {
-            return createTypeFromGenericGlobalType(getGlobalAsyncIterableIteratorType(true), [iteratedType]);
+            return createTypeFromGenericGlobalType(getGlobalAsyncIterableIteratorType(/*reportErrors*/ true), [iteratedType]);
         }
         function createIterableType(iteratedType) {
-            return createTypeFromGenericGlobalType(getGlobalIterableType(true), [iteratedType]);
+            return createTypeFromGenericGlobalType(getGlobalIterableType(/*reportErrors*/ true), [iteratedType]);
         }
         function createIterableIteratorType(iteratedType) {
-            return createTypeFromGenericGlobalType(getGlobalIterableIteratorType(true), [iteratedType]);
+            return createTypeFromGenericGlobalType(getGlobalIterableIteratorType(/*reportErrors*/ true), [iteratedType]);
         }
         function createArrayType(elementType) {
             return createTypeFromGenericGlobalType(globalArrayType, [elementType]);
@@ -29461,20 +36532,27 @@ var ts;
             }
             return links.resolvedType;
         }
+        // We represent tuple types as type references to synthesized generic interface types created by
+        // this function. The types are of the form:
+        //
+        //   interface Tuple<T0, T1, T2, ...> extends Array<T0 | T1 | T2 | ...> { 0: T0, 1: T1, 2: T2, ... }
+        //
+        // Note that the generic type created by this function has no symbol associated with it. The same
+        // is true for each of the synthesized type parameters.
         function createTupleTypeOfArity(arity) {
             var typeParameters = [];
             var properties = [];
             for (var i = 0; i < arity; i++) {
-                var typeParameter = createType(65536);
+                var typeParameter = createType(65536 /* TypeParameter */);
                 typeParameters.push(typeParameter);
-                var property = createSymbol(4, "" + i);
+                var property = createSymbol(4 /* Property */, "" + i);
                 property.type = typeParameter;
                 properties.push(property);
             }
-            var lengthSymbol = createSymbol(4, "length");
+            var lengthSymbol = createSymbol(4 /* Property */, "length");
             lengthSymbol.type = getLiteralType(arity);
             properties.push(lengthSymbol);
-            var type = createObjectType(8 | 4);
+            var type = createObjectType(8 /* Tuple */ | 4 /* Reference */);
             type.typeParameters = typeParameters;
             type.outerTypeParameters = undefined;
             type.localTypeParameters = typeParameters;
@@ -29482,7 +36560,7 @@ var ts;
             type.instantiations.set(getTypeListId(type.typeParameters), type);
             type.target = type;
             type.typeArguments = type.typeParameters;
-            type.thisType = createType(65536);
+            type.thisType = createType(65536 /* TypeParameter */);
             type.thisType.isThisType = true;
             type.thisType.constraint = type;
             type.declaredProperties = properties;
@@ -29511,20 +36589,28 @@ var ts;
         function containsType(types, type) {
             return ts.binarySearch(types, type, getTypeId, ts.compareValues) >= 0;
         }
+        // Return true if the given intersection type contains
+        // more than one unit type or,
+        // an object type and a nullable type (null or undefined), or
+        // a string-like type and a type known to be non-string-like, or
+        // a number-like type and a type known to be non-number-like, or
+        // a symbol-like type and a type known to be non-symbol-like, or
+        // a void-like type and a type known to be non-void-like, or
+        // a non-primitive type and a type known to be primitive.
         function isEmptyIntersectionType(type) {
             var combined = 0;
             for (var _i = 0, _a = type.types; _i < _a.length; _i++) {
                 var t = _a[_i];
-                if (t.flags & 27072 && combined & 27072) {
+                if (t.flags & 27072 /* Unit */ && combined & 27072 /* Unit */) {
                     return true;
                 }
                 combined |= t.flags;
-                if (combined & 24576 && combined & (131072 | 16777216) ||
-                    combined & 16777216 && combined & (16809468 & ~16777216) ||
-                    combined & 68 && combined & (16809468 & ~68) ||
-                    combined & 168 && combined & (16809468 & ~168) ||
-                    combined & 3072 && combined & (16809468 & ~3072) ||
-                    combined & 12288 && combined & (16809468 & ~12288)) {
+                if (combined & 24576 /* Nullable */ && combined & (131072 /* Object */ | 16777216 /* NonPrimitive */) ||
+                    combined & 16777216 /* NonPrimitive */ && combined & (16809468 /* DisjointDomains */ & ~16777216 /* NonPrimitive */) ||
+                    combined & 68 /* StringLike */ && combined & (16809468 /* DisjointDomains */ & ~68 /* StringLike */) ||
+                    combined & 168 /* NumberLike */ && combined & (16809468 /* DisjointDomains */ & ~168 /* NumberLike */) ||
+                    combined & 3072 /* ESSymbolLike */ && combined & (16809468 /* DisjointDomains */ & ~3072 /* ESSymbolLike */) ||
+                    combined & 12288 /* VoidLike */ && combined & (16809468 /* DisjointDomains */ & ~12288 /* VoidLike */)) {
                     return true;
                 }
             }
@@ -29532,25 +36618,29 @@ var ts;
         }
         function addTypeToUnion(typeSet, includes, type) {
             var flags = type.flags;
-            if (flags & 262144) {
+            if (flags & 262144 /* Union */) {
                 return addTypesToUnion(typeSet, includes, type.types);
             }
-            if (!(flags & 32768 || flags & 524288 && isEmptyIntersectionType(type))) {
-                includes |= flags & ~939524096;
-                if (flags & 3) {
+            // We ignore 'never' types in unions. Likewise, we ignore intersections of unit types as they are
+            // another form of 'never' (in that they have an empty value domain). We could in theory turn
+            // intersections of unit types into 'never' upon construction, but deferring the reduction makes it
+            // easier to reason about their origin.
+            if (!(flags & 32768 /* Never */ || flags & 524288 /* Intersection */ && isEmptyIntersectionType(type))) {
+                includes |= flags & ~939524096 /* ConstructionFlags */;
+                if (flags & 3 /* AnyOrUnknown */) {
                     if (type === wildcardType)
-                        includes |= 268435456;
+                        includes |= 268435456 /* Wildcard */;
                 }
-                else if (!strictNullChecks && flags & 24576) {
-                    if (!(flags & 134217728))
-                        includes |= 134217728;
+                else if (!strictNullChecks && flags & 24576 /* Nullable */) {
+                    if (!(flags & 134217728 /* ContainsWideningType */))
+                        includes |= 134217728 /* NonWideningType */;
                 }
                 else {
                     var len = typeSet.length;
                     var index = len && type.id > typeSet[len - 1].id ? ~len : ts.binarySearch(typeSet, type, getTypeId, ts.compareValues);
                     if (index < 0) {
-                        if (!(flags & 131072 && type.objectFlags & 16 &&
-                            type.symbol && type.symbol.flags & (16 | 8192) && containsIdenticalType(typeSet, type))) {
+                        if (!(flags & 131072 /* Object */ && type.objectFlags & 16 /* Anonymous */ &&
+                            type.symbol && type.symbol.flags & (16 /* Function */ | 8192 /* Method */) && containsIdenticalType(typeSet, type))) {
                             typeSet.splice(~index, 0, type);
                         }
                     }
@@ -29558,6 +36648,8 @@ var ts;
             }
             return includes;
         }
+        // Add the given types to the given type set. Order is preserved, duplicates are removed,
+        // and nested types of the given kind are flattened into the set.
         function addTypesToUnion(typeSet, includes, types) {
             for (var _i = 0, types_6 = types; _i < types_6.length; _i++) {
                 var type = types_6[_i];
@@ -29577,8 +36669,8 @@ var ts;
         function isSubtypeOfAny(source, targets) {
             for (var _i = 0, targets_1 = targets; _i < targets_1.length; _i++) {
                 var target = targets_1[_i];
-                if (source !== target && isTypeSubtypeOf(source, target) && (!(ts.getObjectFlags(getTargetType(source)) & 1) ||
-                    !(ts.getObjectFlags(getTargetType(target)) & 1) ||
+                if (source !== target && isTypeSubtypeOf(source, target) && (!(ts.getObjectFlags(getTargetType(source)) & 1 /* Class */) ||
+                    !(ts.getObjectFlags(getTargetType(target)) & 1 /* Class */) ||
                     isTypeDerivedFrom(source, target))) {
                     return true;
                 }
@@ -29587,11 +36679,11 @@ var ts;
         }
         function isSetOfLiteralsFromSameEnum(types) {
             var first = types[0];
-            if (first.flags & 512) {
+            if (first.flags & 512 /* EnumLiteral */) {
                 var firstEnum = getParentOfSymbol(first.symbol);
                 for (var i = 1; i < types.length; i++) {
                     var other = types[i];
-                    if (!(other.flags & 512) || (firstEnum !== getParentOfSymbol(other.symbol))) {
+                    if (!(other.flags & 512 /* EnumLiteral */) || (firstEnum !== getParentOfSymbol(other.symbol))) {
                         return false;
                     }
                 }
@@ -29616,17 +36708,24 @@ var ts;
             while (i > 0) {
                 i--;
                 var t = types[i];
-                var remove = t.flags & 64 && includes & 4 ||
-                    t.flags & 128 && includes & 8 ||
-                    t.flags & 2048 && includes & 1024 ||
-                    t.flags & 192 && t.flags & 33554432 && containsType(types, t.regularType);
+                var remove = t.flags & 64 /* StringLiteral */ && includes & 4 /* String */ ||
+                    t.flags & 128 /* NumberLiteral */ && includes & 8 /* Number */ ||
+                    t.flags & 2048 /* UniqueESSymbol */ && includes & 1024 /* ESSymbol */ ||
+                    t.flags & 192 /* StringOrNumberLiteral */ && t.flags & 33554432 /* FreshLiteral */ && containsType(types, t.regularType);
                 if (remove) {
                     ts.orderedRemoveItemAt(types, i);
                 }
             }
         }
+        // We sort and deduplicate the constituent types based on object identity. If the subtypeReduction
+        // flag is specified we also reduce the constituent type set to only include types that aren't subtypes
+        // of other types. Subtype reduction is expensive for large union types and is possible only when union
+        // types are known not to circularly reference themselves (as is the case with union types created by
+        // expression constructs such as array literals and the || and ?: operators). Named types can
+        // circularly reference themselves and therefore cannot be subtype reduced during their declaration.
+        // For example, "type Item = string | (() => Item" is a named type that circularly references itself.
         function getUnionType(types, unionReduction, aliasSymbol, aliasTypeArguments) {
-            if (unionReduction === void 0) { unionReduction = 1; }
+            if (unionReduction === void 0) { unionReduction = 1 /* Literal */; }
             if (types.length === 0) {
                 return neverType;
             }
@@ -29635,25 +36734,25 @@ var ts;
             }
             var typeSet = [];
             var includes = addTypesToUnion(typeSet, 0, types);
-            if (includes & 3) {
-                return includes & 1 ? includes & 268435456 ? wildcardType : anyType : unknownType;
+            if (includes & 3 /* AnyOrUnknown */) {
+                return includes & 1 /* Any */ ? includes & 268435456 /* Wildcard */ ? wildcardType : anyType : unknownType;
             }
             switch (unionReduction) {
-                case 1:
-                    if (includes & 2240) {
+                case 1 /* Literal */:
+                    if (includes & 2240 /* StringOrNumberLiteralOrUnique */) {
                         removeRedundantLiteralTypes(typeSet, includes);
                     }
                     break;
-                case 2:
+                case 2 /* Subtype */:
                     removeSubtypes(typeSet);
                     break;
             }
             if (typeSet.length === 0) {
-                return includes & 16384 ? includes & 134217728 ? nullType : nullWideningType :
-                    includes & 8192 ? includes & 134217728 ? undefinedType : undefinedWideningType :
+                return includes & 16384 /* Null */ ? includes & 134217728 /* NonWideningType */ ? nullType : nullWideningType :
+                    includes & 8192 /* Undefined */ ? includes & 134217728 /* NonWideningType */ ? undefinedType : undefinedWideningType :
                         neverType;
             }
-            return getUnionTypeFromSortedList(typeSet, includes & 16749629 ? 0 : 67108864, aliasSymbol, aliasTypeArguments);
+            return getUnionTypeFromSortedList(typeSet, includes & 16749629 /* NotUnit */ ? 0 : 67108864 /* UnionOfUnitTypes */, aliasSymbol, aliasTypeArguments);
         }
         function getUnionTypePredicate(signatures) {
             var first;
@@ -29666,6 +36765,7 @@ var ts;
                 }
                 if (first) {
                     if (!typePredicateKindsMatch(first, pred)) {
+                        // No common type predicate.
                         return undefined;
                     }
                 }
@@ -29675,6 +36775,7 @@ var ts;
                 types.push(pred.type);
             }
             if (!first) {
+                // No union signatures had a type predicate.
                 return undefined;
             }
             var unionType = getUnionType(types);
@@ -29687,6 +36788,7 @@ var ts;
                 ? ts.isIdentifierTypePredicate(b) && a.parameterIndex === b.parameterIndex
                 : !ts.isIdentifierTypePredicate(b);
         }
+        // This function assumes the constituent type list is sorted and deduplicated.
         function getUnionTypeFromSortedList(types, unionOfUnitTypes, aliasSymbol, aliasTypeArguments) {
             if (types.length === 0) {
                 return neverType;
@@ -29697,10 +36799,16 @@ var ts;
             var id = getTypeListId(types);
             var type = unionTypes.get(id);
             if (!type) {
-                var propagatedFlags = getPropagatingFlagsOfTypes(types, 24576);
-                type = createType(262144 | propagatedFlags | unionOfUnitTypes);
+                var propagatedFlags = getPropagatingFlagsOfTypes(types, /*excludeKinds*/ 24576 /* Nullable */);
+                type = createType(262144 /* Union */ | propagatedFlags | unionOfUnitTypes);
                 unionTypes.set(id, type);
                 type.types = types;
+                /*
+                Note: This is the alias symbol (or lack thereof) that we see when we first encounter this union type.
+                For aliases of identical unions, eg `type T = A | B; type U = A | B`, the symbol of the first alias encountered is the aliasSymbol.
+                (In the language service, the order may depend on the order in which a user takes actions, such as hovering over symbols.)
+                It's important that we create equivalent union types only once, so that's an unfortunate side effect.
+                */
                 type.aliasSymbol = aliasSymbol;
                 type.aliasTypeArguments = aliasTypeArguments;
             }
@@ -29710,33 +36818,35 @@ var ts;
             var links = getNodeLinks(node);
             if (!links.resolvedType) {
                 var aliasSymbol = getAliasSymbolForTypeNode(node);
-                links.resolvedType = getUnionType(ts.map(node.types, getTypeFromTypeNode), 1, aliasSymbol, getTypeArgumentsForAliasSymbol(aliasSymbol));
+                links.resolvedType = getUnionType(ts.map(node.types, getTypeFromTypeNode), 1 /* Literal */, aliasSymbol, getTypeArgumentsForAliasSymbol(aliasSymbol));
             }
             return links.resolvedType;
         }
         function addTypeToIntersection(typeSet, includes, type) {
             var flags = type.flags;
-            if (flags & 524288) {
+            if (flags & 524288 /* Intersection */) {
                 return addTypesToIntersection(typeSet, includes, type.types);
             }
-            if (ts.getObjectFlags(type) & 16 && isEmptyObjectType(type)) {
-                includes |= 536870912;
+            if (ts.getObjectFlags(type) & 16 /* Anonymous */ && isEmptyObjectType(type)) {
+                includes |= 536870912 /* EmptyObject */;
             }
             else {
-                includes |= flags & ~939524096;
-                if (flags & 3) {
+                includes |= flags & ~939524096 /* ConstructionFlags */;
+                if (flags & 3 /* AnyOrUnknown */) {
                     if (type === wildcardType)
-                        includes |= 268435456;
+                        includes |= 268435456 /* Wildcard */;
                 }
-                else if ((strictNullChecks || !(flags & 24576)) && !ts.contains(typeSet, type) &&
-                    !(flags & 131072 && type.objectFlags & 16 &&
-                        type.symbol && type.symbol.flags & (16 | 8192) &&
+                else if ((strictNullChecks || !(flags & 24576 /* Nullable */)) && !ts.contains(typeSet, type) &&
+                    !(flags & 131072 /* Object */ && type.objectFlags & 16 /* Anonymous */ &&
+                        type.symbol && type.symbol.flags & (16 /* Function */ | 8192 /* Method */) &&
                         containsIdenticalType(typeSet, type))) {
                     typeSet.push(type);
                 }
             }
             return includes;
         }
+        // Add the given types to the given type set. Order is preserved, freshness is removed from literal
+        // types, duplicates are removed, and nested types of the given kind are flattened into the set.
         function addTypesToIntersection(typeSet, includes, types) {
             for (var _i = 0, types_8 = types; _i < types_8.length; _i++) {
                 var type = types_8[_i];
@@ -29749,54 +36859,67 @@ var ts;
             while (i > 0) {
                 i--;
                 var t = types[i];
-                var remove = t.flags & 4 && includes & 64 ||
-                    t.flags & 8 && includes & 128 ||
-                    t.flags & 1024 && includes & 2048;
+                var remove = t.flags & 4 /* String */ && includes & 64 /* StringLiteral */ ||
+                    t.flags & 8 /* Number */ && includes & 128 /* NumberLiteral */ ||
+                    t.flags & 1024 /* ESSymbol */ && includes & 2048 /* UniqueESSymbol */;
                 if (remove) {
                     ts.orderedRemoveItemAt(types, i);
                 }
             }
         }
+        // When intersecting unions of unit types we can simply intersect based on type identity.
+        // Here we remove all unions of unit types from the given list and replace them with a
+        // a single union containing an intersection of the unit types.
         function intersectUnionsOfUnitTypes(types) {
-            var unionIndex = ts.findIndex(types, function (t) { return (t.flags & 67108864) !== 0; });
+            var unionIndex = ts.findIndex(types, function (t) { return (t.flags & 67108864 /* UnionOfUnitTypes */) !== 0; });
             var unionType = types[unionIndex];
             var intersection = unionType.types;
             var i = types.length - 1;
-            var _loop_5 = function () {
+            var _loop_3 = function () {
                 var t = types[i];
-                if (t.flags & 67108864) {
+                if (t.flags & 67108864 /* UnionOfUnitTypes */) {
                     intersection = ts.filter(intersection, function (u) { return containsType(t.types, u); });
                     ts.orderedRemoveItemAt(types, i);
                 }
                 i--;
             };
             while (i > unionIndex) {
-                _loop_5();
+                _loop_3();
             }
             if (intersection === unionType.types) {
                 return false;
             }
-            types[unionIndex] = getUnionTypeFromSortedList(intersection, unionType.flags & 67108864);
+            types[unionIndex] = getUnionTypeFromSortedList(intersection, unionType.flags & 67108864 /* UnionOfUnitTypes */);
             return true;
         }
+        // We normalize combinations of intersection and union types based on the distributive property of the '&'
+        // operator. Specifically, because X & (A | B) is equivalent to X & A | X & B, we can transform intersection
+        // types with union type constituents into equivalent union types with intersection type constituents and
+        // effectively ensure that union types are always at the top level in type representations.
+        //
+        // We do not perform structural deduplication on intersection types. Intersection types are created only by the &
+        // type operator and we can't reduce those because we want to support recursive intersection types. For example,
+        // a type alias of the form "type List<T> = T & { next: List<T> }" cannot be reduced during its declaration.
+        // Also, unlike union types, the order of the constituent types is preserved in order that overload resolution
+        // for intersections of types with signatures can be deterministic.
         function getIntersectionType(types, aliasSymbol, aliasTypeArguments) {
             var typeSet = [];
             var includes = addTypesToIntersection(typeSet, 0, types);
-            if (includes & 32768) {
+            if (includes & 32768 /* Never */) {
                 return neverType;
             }
-            if (includes & 1) {
-                return includes & 268435456 ? wildcardType : anyType;
+            if (includes & 1 /* Any */) {
+                return includes & 268435456 /* Wildcard */ ? wildcardType : anyType;
             }
-            if (!strictNullChecks && includes & 24576) {
-                return includes & 8192 ? undefinedType : nullType;
+            if (!strictNullChecks && includes & 24576 /* Nullable */) {
+                return includes & 8192 /* Undefined */ ? undefinedType : nullType;
             }
-            if (includes & 4 && includes & 64 ||
-                includes & 8 && includes & 128 ||
-                includes & 1024 && includes & 2048) {
+            if (includes & 4 /* String */ && includes & 64 /* StringLiteral */ ||
+                includes & 8 /* Number */ && includes & 128 /* NumberLiteral */ ||
+                includes & 1024 /* ESSymbol */ && includes & 2048 /* UniqueESSymbol */) {
                 removeRedundantPrimitiveTypes(typeSet, includes);
             }
-            if (includes & 536870912 && !(includes & 131072)) {
+            if (includes & 536870912 /* EmptyObject */ && !(includes & 131072 /* Object */)) {
                 typeSet.push(emptyObjectType);
             }
             if (typeSet.length === 0) {
@@ -29805,22 +36928,27 @@ var ts;
             if (typeSet.length === 1) {
                 return typeSet[0];
             }
-            if (includes & 262144) {
-                if (includes & 67108864 && intersectUnionsOfUnitTypes(typeSet)) {
+            if (includes & 262144 /* Union */) {
+                if (includes & 67108864 /* UnionOfUnitTypes */ && intersectUnionsOfUnitTypes(typeSet)) {
+                    // When the intersection creates a reduced set (which might mean that *all* union types have
+                    // disappeared), we restart the operation to get a new set of combined flags. Once we have
+                    // reduced we'll never reduce again, so this occurs at most once.
                     return getIntersectionType(typeSet, aliasSymbol, aliasTypeArguments);
                 }
-                var unionIndex_1 = ts.findIndex(typeSet, function (t) { return (t.flags & 262144) !== 0; });
+                // We are attempting to construct a type of the form X & (A | B) & Y. Transform this into a type of
+                // the form X & A & Y | X & B & Y and recursively reduce until no union type constituents remain.
+                var unionIndex_1 = ts.findIndex(typeSet, function (t) { return (t.flags & 262144 /* Union */) !== 0; });
                 var unionType = typeSet[unionIndex_1];
-                return getUnionType(ts.map(unionType.types, function (t) { return getIntersectionType(ts.replaceElement(typeSet, unionIndex_1, t)); }), 1, aliasSymbol, aliasTypeArguments);
+                return getUnionType(ts.map(unionType.types, function (t) { return getIntersectionType(ts.replaceElement(typeSet, unionIndex_1, t)); }), 1 /* Literal */, aliasSymbol, aliasTypeArguments);
             }
             var id = getTypeListId(typeSet);
             var type = intersectionTypes.get(id);
             if (!type) {
-                var propagatedFlags = getPropagatingFlagsOfTypes(typeSet, 24576);
-                type = createType(524288 | propagatedFlags);
+                var propagatedFlags = getPropagatingFlagsOfTypes(typeSet, /*excludeKinds*/ 24576 /* Nullable */);
+                type = createType(524288 /* Intersection */ | propagatedFlags);
                 intersectionTypes.set(id, type);
                 type.types = typeSet;
-                type.aliasSymbol = aliasSymbol;
+                type.aliasSymbol = aliasSymbol; // See comment in `getUnionTypeFromSortedList`.
                 type.aliasTypeArguments = aliasTypeArguments;
             }
             return type;
@@ -29834,23 +36962,23 @@ var ts;
             return links.resolvedType;
         }
         function createIndexType(type, stringsOnly) {
-            var result = createType(1048576);
+            var result = createType(1048576 /* Index */);
             result.type = type;
             result.stringsOnly = stringsOnly;
             return result;
         }
         function getIndexTypeForGenericType(type, stringsOnly) {
             return stringsOnly ?
-                type.resolvedStringIndexType || (type.resolvedStringIndexType = createIndexType(type, true)) :
-                type.resolvedIndexType || (type.resolvedIndexType = createIndexType(type, false));
+                type.resolvedStringIndexType || (type.resolvedStringIndexType = createIndexType(type, /*stringsOnly*/ true)) :
+                type.resolvedIndexType || (type.resolvedIndexType = createIndexType(type, /*stringsOnly*/ false));
         }
         function getLiteralTypeFromPropertyName(prop, include) {
-            if (!(ts.getDeclarationModifierFlagsFromSymbol(prop) & 24)) {
+            if (!(ts.getDeclarationModifierFlagsFromSymbol(prop) & 24 /* NonPublicAccessibilityModifier */)) {
                 var type = getLateBoundSymbol(prop).nameType;
                 if (!type && !ts.isKnownSymbol(prop)) {
                     var name = ts.getNameOfDeclaration(prop.valueDeclaration);
                     type = name && ts.isNumericLiteral(name) ? getLiteralType(+name.text) :
-                        name && name.kind === 147 && ts.isNumericLiteral(name.expression) ? getLiteralType(+name.expression.text) :
+                        name && name.kind === 147 /* ComputedPropertyName */ && ts.isNumericLiteral(name.expression) ? getLiteralType(+name.expression.text) :
                             getLiteralType(ts.symbolName(prop));
                 }
                 if (type && type.flags & include) {
@@ -29863,21 +36991,21 @@ var ts;
             return getUnionType(ts.map(getPropertiesOfType(type), function (t) { return getLiteralTypeFromPropertyName(t, include); }));
         }
         function getNonEnumNumberIndexInfo(type) {
-            var numberIndexInfo = getIndexInfoOfType(type, 1);
+            var numberIndexInfo = getIndexInfoOfType(type, 1 /* Number */);
             return numberIndexInfo !== enumNumberIndexInfo ? numberIndexInfo : undefined;
         }
         function getIndexType(type, stringsOnly) {
             if (stringsOnly === void 0) { stringsOnly = keyofStringsOnly; }
-            return type.flags & 262144 ? getIntersectionType(ts.map(type.types, function (t) { return getIndexType(t, stringsOnly); })) :
-                type.flags & 524288 ? getUnionType(ts.map(type.types, function (t) { return getIndexType(t, stringsOnly); })) :
-                    maybeTypeOfKind(type, 14745600) ? getIndexTypeForGenericType(type, stringsOnly) :
-                        ts.getObjectFlags(type) & 32 ? getConstraintTypeFromMappedType(type) :
+            return type.flags & 262144 /* Union */ ? getIntersectionType(ts.map(type.types, function (t) { return getIndexType(t, stringsOnly); })) :
+                type.flags & 524288 /* Intersection */ ? getUnionType(ts.map(type.types, function (t) { return getIndexType(t, stringsOnly); })) :
+                    maybeTypeOfKind(type, 14745600 /* InstantiableNonPrimitive */) ? getIndexTypeForGenericType(type, stringsOnly) :
+                        ts.getObjectFlags(type) & 32 /* Mapped */ ? getConstraintTypeFromMappedType(type) :
                             type === wildcardType ? wildcardType :
-                                type.flags & 1 ? keyofConstraintType :
-                                    stringsOnly ? getIndexInfoOfType(type, 0) ? stringType : getLiteralTypeFromPropertyNames(type, 64) :
-                                        getIndexInfoOfType(type, 0) ? getUnionType([stringType, numberType, getLiteralTypeFromPropertyNames(type, 2048)]) :
-                                            getNonEnumNumberIndexInfo(type) ? getUnionType([numberType, getLiteralTypeFromPropertyNames(type, 64 | 2048)]) :
-                                                getLiteralTypeFromPropertyNames(type, 2240);
+                                type.flags & 1 /* Any */ ? keyofConstraintType :
+                                    stringsOnly ? getIndexInfoOfType(type, 0 /* String */) ? stringType : getLiteralTypeFromPropertyNames(type, 64 /* StringLiteral */) :
+                                        getIndexInfoOfType(type, 0 /* String */) ? getUnionType([stringType, numberType, getLiteralTypeFromPropertyNames(type, 2048 /* UniqueESSymbol */)]) :
+                                            getNonEnumNumberIndexInfo(type) ? getUnionType([numberType, getLiteralTypeFromPropertyNames(type, 64 /* StringLiteral */ | 2048 /* UniqueESSymbol */)]) :
+                                                getLiteralTypeFromPropertyNames(type, 2240 /* StringOrNumberLiteralOrUnique */);
         }
         function getExtractStringType(type) {
             if (keyofStringsOnly) {
@@ -29888,41 +37016,41 @@ var ts;
         }
         function getIndexTypeOrString(type) {
             var indexType = getExtractStringType(getIndexType(type));
-            return indexType.flags & 32768 ? stringType : indexType;
+            return indexType.flags & 32768 /* Never */ ? stringType : indexType;
         }
         function getTypeFromTypeOperatorNode(node) {
             var links = getNodeLinks(node);
             if (!links.resolvedType) {
                 switch (node.operator) {
-                    case 128:
+                    case 128 /* KeyOfKeyword */:
                         links.resolvedType = getIndexType(getTypeFromTypeNode(node.type));
                         break;
-                    case 141:
-                        links.resolvedType = node.type.kind === 138
+                    case 141 /* UniqueKeyword */:
+                        links.resolvedType = node.type.kind === 138 /* SymbolKeyword */
                             ? getESSymbolLikeTypeForNode(ts.walkUpParenthesizedTypes(node.parent))
                             : errorType;
                         break;
                 }
             }
-            return links.resolvedType;
+            return links.resolvedType; // TODO: GH#18217
         }
         function createIndexedAccessType(objectType, indexType) {
-            var type = createType(2097152);
+            var type = createType(2097152 /* IndexedAccess */);
             type.objectType = objectType;
             type.indexType = indexType;
             return type;
         }
         function getPropertyTypeForIndexType(objectType, indexType, accessNode, cacheSymbol) {
-            var accessExpression = accessNode && accessNode.kind === 186 ? accessNode : undefined;
+            var accessExpression = accessNode && accessNode.kind === 186 /* ElementAccessExpression */ ? accessNode : undefined;
             var propName = isTypeUsableAsLateBoundName(indexType) ? getLateBoundNameFromType(indexType) :
-                accessExpression && checkThatExpressionIsProperSymbolReference(accessExpression.argumentExpression, indexType, false) ?
+                accessExpression && checkThatExpressionIsProperSymbolReference(accessExpression.argumentExpression, indexType, /*reportError*/ false) ?
                     ts.getPropertyNameForKnownSymbolName(ts.idText(accessExpression.argumentExpression.name)) :
                     undefined;
             if (propName !== undefined) {
                 var prop = getPropertyOfType(objectType, propName);
                 if (prop) {
                     if (accessExpression) {
-                        markPropertyAsReferenced(prop, accessExpression, accessExpression.expression.kind === 99);
+                        markPropertyAsReferenced(prop, accessExpression, /*isThisAccess*/ accessExpression.expression.kind === 99 /* ThisKeyword */);
                         if (ts.isAssignmentTarget(accessExpression) && (isReferenceToReadonlyEntity(accessExpression, prop) || isReferenceThroughNamespaceImport(accessExpression))) {
                             error(accessExpression.argumentExpression, ts.Diagnostics.Cannot_assign_to_0_because_it_is_a_constant_or_a_read_only_property, symbolToString(prop));
                             return errorType;
@@ -29934,16 +37062,16 @@ var ts;
                     return getTypeOfSymbol(prop);
                 }
             }
-            if (!(indexType.flags & 24576) && isTypeAssignableToKind(indexType, 68 | 168 | 3072)) {
+            if (!(indexType.flags & 24576 /* Nullable */) && isTypeAssignableToKind(indexType, 68 /* StringLike */ | 168 /* NumberLike */ | 3072 /* ESSymbolLike */)) {
                 if (isTypeAny(objectType)) {
                     return objectType;
                 }
-                var indexInfo = isTypeAssignableToKind(indexType, 168) && getIndexInfoOfType(objectType, 1) ||
-                    getIndexInfoOfType(objectType, 0) ||
+                var indexInfo = isTypeAssignableToKind(indexType, 168 /* NumberLike */) && getIndexInfoOfType(objectType, 1 /* Number */) ||
+                    getIndexInfoOfType(objectType, 0 /* String */) ||
                     undefined;
                 if (indexInfo) {
-                    if (accessNode && !isTypeAssignableToKind(indexType, 4 | 8)) {
-                        var indexNode = accessNode.kind === 186 ? accessNode.argumentExpression : accessNode.indexType;
+                    if (accessNode && !isTypeAssignableToKind(indexType, 4 /* String */ | 8 /* Number */)) {
+                        var indexNode = accessNode.kind === 186 /* ElementAccessExpression */ ? accessNode.argumentExpression : accessNode.indexType;
                         error(indexNode, ts.Diagnostics.Type_0_cannot_be_used_as_an_index_type, typeToString(indexType));
                     }
                     else if (accessExpression && indexInfo.isReadonly && (ts.isAssignmentTarget(accessExpression) || ts.isDeleteTarget(accessExpression))) {
@@ -29951,12 +37079,12 @@ var ts;
                     }
                     return indexInfo.type;
                 }
-                if (indexType.flags & 32768) {
+                if (indexType.flags & 32768 /* Never */) {
                     return neverType;
                 }
                 if (accessExpression && !isConstEnumObjectType(objectType)) {
                     if (noImplicitAny && !compilerOptions.suppressImplicitAnyIndexErrors) {
-                        if (getIndexTypeOfType(objectType, 1)) {
+                        if (getIndexTypeOfType(objectType, 1 /* Number */)) {
                             error(accessExpression.argumentExpression, ts.Diagnostics.Element_implicitly_has_an_any_type_because_index_expression_is_not_of_type_number);
                         }
                         else {
@@ -29967,11 +37095,11 @@ var ts;
                 }
             }
             if (accessNode) {
-                var indexNode = accessNode.kind === 186 ? accessNode.argumentExpression : accessNode.indexType;
-                if (indexType.flags & (64 | 128)) {
+                var indexNode = accessNode.kind === 186 /* ElementAccessExpression */ ? accessNode.argumentExpression : accessNode.indexType;
+                if (indexType.flags & (64 /* StringLiteral */ | 128 /* NumberLiteral */)) {
                     error(indexNode, ts.Diagnostics.Property_0_does_not_exist_on_type_1, "" + indexType.value, typeToString(objectType));
                 }
-                else if (indexType.flags & (4 | 8)) {
+                else if (indexType.flags & (4 /* String */ | 8 /* Number */)) {
                     error(indexNode, ts.Diagnostics.Type_0_has_no_matching_index_signature_for_type_1, typeToString(objectType), typeToString(indexType));
                 }
                 else {
@@ -29981,13 +37109,15 @@ var ts;
             return errorType;
         }
         function isGenericObjectType(type) {
-            return maybeTypeOfKind(type, 14745600 | 134217728);
+            return maybeTypeOfKind(type, 14745600 /* InstantiableNonPrimitive */ | 134217728 /* GenericMappedType */);
         }
         function isGenericIndexType(type) {
-            return maybeTypeOfKind(type, 14745600 | 1048576);
+            return maybeTypeOfKind(type, 14745600 /* InstantiableNonPrimitive */ | 1048576 /* Index */);
         }
+        // Return true if the given type is a non-generic object type with a string index signature and no
+        // other members.
         function isStringIndexOnlyType(type) {
-            if (type.flags & 131072 && !isGenericMappedType(type)) {
+            if (type.flags & 131072 /* Object */ && !isGenericMappedType(type)) {
                 var t = resolveStructuredTypeMembers(type);
                 return t.properties.length === 0 &&
                     t.callSignatures.length === 0 && t.constructSignatures.length === 0 &&
@@ -29996,25 +37126,33 @@ var ts;
             return false;
         }
         function isMappedTypeToNever(type) {
-            return !!(ts.getObjectFlags(type) & 32) && getTemplateTypeFromMappedType(type) === neverType;
+            return !!(ts.getObjectFlags(type) & 32 /* Mapped */) && getTemplateTypeFromMappedType(type) === neverType;
         }
         function getSimplifiedType(type) {
-            return type.flags & 2097152 ? getSimplifiedIndexedAccessType(type) : type;
+            return type.flags & 2097152 /* IndexedAccess */ ? getSimplifiedIndexedAccessType(type) : type;
         }
+        // Transform an indexed access to a simpler form, if possible. Return the simpler form, or return
+        // the type itself if no transformation is possible.
         function getSimplifiedIndexedAccessType(type) {
             if (type.simplified) {
                 return type.simplified === circularConstraintType ? type : type.simplified;
             }
             type.simplified = circularConstraintType;
+            // We recursively simplify the object type as it may in turn be an indexed access type. For example, with
+            // '{ [P in T]: { [Q in U]: number } }[T][U]' we want to first simplify the inner indexed access type.
             var objectType = getSimplifiedType(type.objectType);
-            if (objectType.flags & 524288 && isGenericObjectType(objectType)) {
+            if (objectType.flags & 524288 /* Intersection */ && isGenericObjectType(objectType)) {
+                // Given an indexed access type T[K], if T is an intersection containing one or more generic types and one or
+                // more object types with only a string index signature, e.g. '(U & V & { [x: string]: D })[K]', return a
+                // transformed type of the form '(U & V)[K] | D'. This allows us to properly reason about higher order indexed
+                // access types with default property values as expressed by D.
                 if (ts.some(objectType.types, isStringIndexOnlyType)) {
                     var regularTypes = [];
                     var stringIndexTypes = [];
                     for (var _i = 0, _a = objectType.types; _i < _a.length; _i++) {
                         var t = _a[_i];
                         if (isStringIndexOnlyType(t)) {
-                            stringIndexTypes.push(getIndexTypeOfType(t, 0));
+                            stringIndexTypes.push(getIndexTypeOfType(t, 0 /* String */));
                         }
                         else {
                             regularTypes.push(t);
@@ -30025,15 +37163,23 @@ var ts;
                         getIntersectionType(stringIndexTypes)
                     ]);
                 }
+                // Given an indexed access type T[K], if T is an intersection containing one or more generic types and one or
+                // more mapped types with a template type `never`, '(U & V & { [P in T]: never })[K]', return a
+                // transformed type that removes the never-mapped type: '(U & V)[K]'. This mirrors what would happen
+                // eventually anyway, but it easier to reason about.
                 if (ts.some(objectType.types, isMappedTypeToNever)) {
                     var nonNeverTypes = ts.filter(objectType.types, function (t) { return !isMappedTypeToNever(t); });
                     return type.simplified = getSimplifiedType(getIndexedAccessType(getIntersectionType(nonNeverTypes), type.indexType));
                 }
             }
+            // If the object type is a mapped type { [P in K]: E }, where K is generic, instantiate E using a mapper
+            // that substitutes the index type for P. For example, for an index access { [P in K]: Box<T[P]> }[X], we
+            // construct the type Box<T[X]>. We do not further simplify the result because mapped types can be recursive
+            // and we might never terminate.
             if (isGenericMappedType(objectType)) {
                 return type.simplified = substituteIndexedMappedType(objectType, type);
             }
-            if (objectType.flags & 65536) {
+            if (objectType.flags & 65536 /* TypeParameter */) {
                 var constraint = getConstraintFromTypeParameter(objectType);
                 if (constraint && isGenericMappedType(constraint)) {
                     return type.simplified = substituteIndexedMappedType(constraint, type);
@@ -30050,10 +37196,16 @@ var ts;
             if (objectType === wildcardType || indexType === wildcardType) {
                 return wildcardType;
             }
-            if (isGenericIndexType(indexType) || !(accessNode && accessNode.kind === 186) && isGenericObjectType(objectType)) {
-                if (objectType.flags & 3) {
+            // If the index type is generic, or if the object type is generic and doesn't originate in an expression,
+            // we are performing a higher-order index access where we cannot meaningfully access the properties of the
+            // object type. Note that for a generic T and a non-generic K, we eagerly resolve T[K] if it originates in
+            // an expression. This is to preserve backwards compatibility. For example, an element access 'this["foo"]'
+            // has always been resolved eagerly using the constraint type of 'this' at the given location.
+            if (isGenericIndexType(indexType) || !(accessNode && accessNode.kind === 186 /* ElementAccessExpression */) && isGenericObjectType(objectType)) {
+                if (objectType.flags & 3 /* AnyOrUnknown */) {
                     return objectType;
                 }
+                // Defer the operation by creating an indexed access type.
                 var id = objectType.id + "," + indexType.id;
                 var type = indexedAccessTypes.get(id);
                 if (!type) {
@@ -30061,12 +37213,15 @@ var ts;
                 }
                 return type;
             }
+            // In the following we resolve T[K] to the type of the property in T selected by K.
+            // We treat boolean as different from other unions to improve errors;
+            // skipping straight to getPropertyTypeForIndexType gives errors with 'boolean' instead of 'true'.
             var apparentObjectType = getApparentType(objectType);
-            if (indexType.flags & 262144 && !(indexType.flags & 16)) {
+            if (indexType.flags & 262144 /* Union */ && !(indexType.flags & 16 /* Boolean */)) {
                 var propTypes = [];
                 for (var _i = 0, _a = indexType.types; _i < _a.length; _i++) {
                     var t = _a[_i];
-                    var propType = getPropertyTypeForIndexType(apparentObjectType, t, accessNode, false);
+                    var propType = getPropertyTypeForIndexType(apparentObjectType, t, accessNode, /*cacheSymbol*/ false);
                     if (propType === errorType) {
                         return errorType;
                     }
@@ -30074,7 +37229,7 @@ var ts;
                 }
                 return getUnionType(propTypes);
             }
-            return getPropertyTypeForIndexType(apparentObjectType, indexType, accessNode, true);
+            return getPropertyTypeForIndexType(apparentObjectType, indexType, accessNode, /*cacheSymbol*/ true);
         }
         function getTypeFromIndexedAccessTypeNode(node) {
             var links = getNodeLinks(node);
@@ -30082,7 +37237,7 @@ var ts;
                 var objectType = getTypeFromTypeNode(node.objectType);
                 var indexType = getTypeFromTypeNode(node.indexType);
                 var resolved = getIndexedAccessType(objectType, indexType, node);
-                links.resolvedType = resolved.flags & 2097152 &&
+                links.resolvedType = resolved.flags & 2097152 /* IndexedAccess */ &&
                     resolved.objectType === objectType &&
                     resolved.indexType === indexType ?
                     getConstrainedTypeVariable(resolved, node) : resolved;
@@ -30092,17 +37247,19 @@ var ts;
         function getTypeFromMappedTypeNode(node) {
             var links = getNodeLinks(node);
             if (!links.resolvedType) {
-                var type = createObjectType(32, node.symbol);
+                var type = createObjectType(32 /* Mapped */, node.symbol);
                 type.declaration = node;
                 type.aliasSymbol = getAliasSymbolForTypeNode(node);
                 type.aliasTypeArguments = getTypeArgumentsForAliasSymbol(type.aliasSymbol);
                 links.resolvedType = type;
+                // Eagerly resolve the constraint type which forces an error if the constraint type circularly
+                // references itself through one or more type aliases.
                 getConstraintTypeFromMappedType(type);
             }
             return links.resolvedType;
         }
         function getActualTypeVariable(type) {
-            return type.flags & 8388608 ? type.typeVariable : type;
+            return type.flags & 8388608 /* Substitution */ ? type.typeVariable : type;
         }
         function getConditionalType(root, mapper) {
             var checkType = instantiateType(root.checkType, mapper);
@@ -30110,39 +37267,56 @@ var ts;
             if (checkType === wildcardType || extendsType === wildcardType) {
                 return wildcardType;
             }
-            var isDeferred = root.isDistributive && maybeTypeOfKind(checkType, 15794176);
+            // If this is a distributive conditional type and the check type is generic we need to defer
+            // resolution of the conditional type such that a later instantiation will properly distribute
+            // over union types.
+            var isDeferred = root.isDistributive && maybeTypeOfKind(checkType, 15794176 /* Instantiable */);
             var combinedMapper;
             if (root.inferTypeParameters) {
-                var context = createInferenceContext(root.inferTypeParameters, undefined, 0);
+                var context = createInferenceContext(root.inferTypeParameters, /*signature*/ undefined, 0 /* None */);
                 if (!isDeferred) {
-                    inferTypes(context.inferences, checkType, extendsType, 32 | 64);
+                    // We don't want inferences from constraints as they may cause us to eagerly resolve the
+                    // conditional type instead of deferring resolution. Also, we always want strict function
+                    // types rules (i.e. proper contravariance) for inferences.
+                    inferTypes(context.inferences, checkType, extendsType, 32 /* NoConstraints */ | 64 /* AlwaysStrict */);
                 }
                 combinedMapper = combineTypeMappers(mapper, context);
             }
             if (!isDeferred) {
-                if (extendsType.flags & 3) {
+                if (extendsType.flags & 3 /* AnyOrUnknown */) {
                     return instantiateType(root.trueType, mapper);
                 }
-                if (checkType.flags & 1) {
+                // Return union of trueType and falseType for 'any' since it matches anything
+                if (checkType.flags & 1 /* Any */) {
                     return getUnionType([instantiateType(root.trueType, combinedMapper || mapper), instantiateType(root.falseType, mapper)]);
                 }
+                // Instantiate the extends type including inferences for 'infer T' type parameters
                 var inferredExtendsType = combinedMapper ? instantiateType(root.extendsType, combinedMapper) : extendsType;
+                // Return falseType for a definitely false extends check. We check an instantations of the two
+                // types with type parameters mapped to the wildcard type, the most permissive instantiations
+                // possible (the wildcard type is assignable to and from all types). If those are not related,
+                // then no instatiations will be and we can just return the false branch type.
                 if (!isTypeAssignableTo(getWildcardInstantiation(checkType), getWildcardInstantiation(inferredExtendsType))) {
                     return instantiateType(root.falseType, mapper);
                 }
-                if (checkTypeRelatedTo(checkType, inferredExtendsType, definitelyAssignableRelation, undefined)) {
+                // Return trueType for a definitely true extends check. The definitely assignable relation excludes
+                // type variable constraints from consideration. Without the definitely assignable relation, the type
+                //   type Foo<T extends { x: any }> = T extends { x: string } ? string : number
+                // would immediately resolve to 'string' instead of being deferred.
+                if (checkTypeRelatedTo(checkType, inferredExtendsType, definitelyAssignableRelation, /*errorNode*/ undefined)) {
                     return instantiateType(root.trueType, combinedMapper || mapper);
                 }
             }
+            // Return a deferred type for a check that is neither definitely true nor definitely false
             var erasedCheckType = getActualTypeVariable(checkType);
-            var result = createType(4194304);
+            var result = createType(4194304 /* Conditional */);
             result.root = root;
             result.checkType = erasedCheckType;
             result.extendsType = extendsType;
             result.mapper = mapper;
             result.combinedMapper = combinedMapper;
             result.aliasSymbol = root.aliasSymbol;
-            result.aliasTypeArguments = instantiateTypes(root.aliasTypeArguments, mapper);
+            result.aliasTypeArguments = instantiateTypes(root.aliasTypeArguments, mapper); // TODO: GH#18217
             return result;
         }
         function getTrueTypeFromConditionalType(type) {
@@ -30155,7 +37329,7 @@ var ts;
             var result;
             if (node.locals) {
                 node.locals.forEach(function (symbol) {
-                    if (symbol.flags & 262144) {
+                    if (symbol.flags & 262144 /* TypeParameter */) {
                         result = ts.append(result, getDeclaredTypeOfSymbol(symbol));
                     }
                 });
@@ -30167,7 +37341,7 @@ var ts;
                 return true;
             }
             while (node) {
-                if (node.kind === 171) {
+                if (node.kind === 171 /* ConditionalType */) {
                     if (isTypeParameterPossiblyReferenced(tp, node.extendsType)) {
                         return true;
                     }
@@ -30182,7 +37356,7 @@ var ts;
                 var checkType = getTypeFromTypeNode(node.checkType);
                 var aliasSymbol = getAliasSymbolForTypeNode(node);
                 var aliasTypeArguments = getTypeArgumentsForAliasSymbol(aliasSymbol);
-                var allOuterTypeParameters = getOuterTypeParameters(node, true);
+                var allOuterTypeParameters = getOuterTypeParameters(node, /*includeThisTypes*/ true);
                 var outerTypeParameters = aliasTypeArguments ? allOuterTypeParameters : ts.filter(allOuterTypeParameters, function (tp) { return isPossiblyReferencedInConditionalType(tp, node); });
                 var root = {
                     node: node,
@@ -30190,14 +37364,14 @@ var ts;
                     extendsType: getTypeFromTypeNode(node.extendsType),
                     trueType: getTypeFromTypeNode(node.trueType),
                     falseType: getTypeFromTypeNode(node.falseType),
-                    isDistributive: !!(checkType.flags & 65536),
+                    isDistributive: !!(checkType.flags & 65536 /* TypeParameter */),
                     inferTypeParameters: getInferTypeParameters(node),
                     outerTypeParameters: outerTypeParameters,
                     instantiations: undefined,
                     aliasSymbol: aliasSymbol,
                     aliasTypeArguments: aliasTypeArguments
                 };
-                links.resolvedType = getConditionalType(root, undefined);
+                links.resolvedType = getConditionalType(root, /*mapper*/ undefined);
                 if (outerTypeParameters) {
                     root.instantiations = ts.createMap();
                     root.instantiations.set(getTypeListId(outerTypeParameters), links.resolvedType);
@@ -30223,7 +37397,7 @@ var ts;
         function getTypeFromImportTypeNode(node) {
             var links = getNodeLinks(node);
             if (!links.resolvedType) {
-                if (node.isTypeOf && node.typeArguments) {
+                if (node.isTypeOf && node.typeArguments) { // Only the non-typeof form can make use of type arguments
                     error(node, ts.Diagnostics.Type_arguments_cannot_be_used_here);
                     links.resolvedSymbol = unknownSymbol;
                     return links.resolvedType = errorType;
@@ -30234,20 +37408,21 @@ var ts;
                     return links.resolvedType = errorType;
                 }
                 var argumentType = getTypeFromTypeNode(node.argument);
-                var targetMeaning = node.isTypeOf ? 67216319 : 67901928;
+                var targetMeaning = node.isTypeOf ? 67216319 /* Value */ : 67901928 /* Type */;
+                // TODO: Future work: support unions/generics/whatever via a deferred import-type
                 var moduleName = argumentType.value;
-                var innerModuleSymbol = resolveExternalModule(node, moduleName, ts.Diagnostics.Cannot_find_module_0, node, false);
+                var innerModuleSymbol = resolveExternalModule(node, moduleName, ts.Diagnostics.Cannot_find_module_0, node, /*isForAugmentation*/ false);
                 if (!innerModuleSymbol) {
                     links.resolvedSymbol = unknownSymbol;
                     return links.resolvedType = errorType;
                 }
-                var moduleSymbol_1 = resolveExternalModuleSymbol(innerModuleSymbol, false);
+                var moduleSymbol_1 = resolveExternalModuleSymbol(innerModuleSymbol, /*dontResolveAlias*/ false);
                 if (!ts.nodeIsMissing(node.qualifier)) {
                     var nameStack = getIdentifierChain(node.qualifier);
                     var currentNamespace = moduleSymbol_1;
                     var current = void 0;
                     while (current = nameStack.shift()) {
-                        var meaning = nameStack.length ? 1920 : targetMeaning;
+                        var meaning = nameStack.length ? 1920 /* Namespace */ : targetMeaning;
                         var next = getSymbol(getExportsOfSymbol(getMergedSymbol(resolveSymbol(currentNamespace))), current.escapedText, meaning);
                         if (!next) {
                             error(current, ts.Diagnostics.Namespace_0_has_no_exported_member_1, getFullyQualifiedName(currentNamespace), ts.declarationNameToString(current));
@@ -30264,32 +37439,34 @@ var ts;
                         resolveImportSymbolType(node, links, moduleSymbol_1, targetMeaning);
                     }
                     else {
-                        error(node, targetMeaning === 67216319 ? ts.Diagnostics.Module_0_does_not_refer_to_a_value_but_is_used_as_a_value_here : ts.Diagnostics.Module_0_does_not_refer_to_a_type_but_is_used_as_a_type_here, moduleName);
+                        error(node, targetMeaning === 67216319 /* Value */ ? ts.Diagnostics.Module_0_does_not_refer_to_a_value_but_is_used_as_a_value_here : ts.Diagnostics.Module_0_does_not_refer_to_a_type_but_is_used_as_a_type_here, moduleName);
                         links.resolvedSymbol = unknownSymbol;
                         links.resolvedType = errorType;
                     }
                 }
             }
-            return links.resolvedType;
+            return links.resolvedType; // TODO: GH#18217
         }
         function resolveImportSymbolType(node, links, symbol, meaning) {
-            links.resolvedSymbol = symbol;
-            if (meaning === 67216319) {
-                return links.resolvedType = getTypeOfSymbol(symbol);
+            var resolvedSymbol = resolveSymbol(symbol);
+            links.resolvedSymbol = resolvedSymbol;
+            if (meaning === 67216319 /* Value */) {
+                return links.resolvedType = getTypeOfSymbol(symbol); // intentionally doesn't use resolved symbol so type is cached as expected on the alias
             }
             else {
-                return links.resolvedType = getTypeReferenceType(node, symbol);
+                return links.resolvedType = getTypeReferenceType(node, resolvedSymbol); // getTypeReferenceType doesn't handle aliases - it must get the resolved symbol
             }
         }
         function getTypeFromTypeLiteralOrFunctionOrConstructorTypeNode(node) {
             var links = getNodeLinks(node);
             if (!links.resolvedType) {
+                // Deferred resolution of members is handled by resolveObjectTypeMembers
                 var aliasSymbol = getAliasSymbolForTypeNode(node);
                 if (getMembersOfSymbol(node.symbol).size === 0 && !aliasSymbol) {
                     links.resolvedType = emptyTypeLiteralType;
                 }
                 else {
-                    var type = createObjectType(16, node.symbol);
+                    var type = createObjectType(16 /* Anonymous */, node.symbol);
                     type.aliasSymbol = aliasSymbol;
                     type.aliasTypeArguments = getTypeArgumentsForAliasSymbol(aliasSymbol);
                     if (ts.isJSDocTypeLiteral(node) && node.isArrayType) {
@@ -30306,26 +37483,31 @@ var ts;
         function getTypeArgumentsForAliasSymbol(symbol) {
             return symbol ? getLocalTypeParametersOfClassOrInterfaceOrTypeAlias(symbol) : undefined;
         }
+        /**
+         * Since the source of spread types are object literals, which are not binary,
+         * this function should be called in a left folding style, with left = previous result of getSpreadType
+         * and right = the new element to be spread.
+         */
         function getSpreadType(left, right, symbol, typeFlags, objectFlags) {
-            if (left.flags & 1 || right.flags & 1) {
+            if (left.flags & 1 /* Any */ || right.flags & 1 /* Any */) {
                 return anyType;
             }
-            if (left.flags & 2 || right.flags & 2) {
+            if (left.flags & 2 /* Unknown */ || right.flags & 2 /* Unknown */) {
                 return unknownType;
             }
-            if (left.flags & 32768) {
+            if (left.flags & 32768 /* Never */) {
                 return right;
             }
-            if (right.flags & 32768) {
+            if (right.flags & 32768 /* Never */) {
                 return left;
             }
-            if (left.flags & 262144) {
+            if (left.flags & 262144 /* Union */) {
                 return mapType(left, function (t) { return getSpreadType(t, right, symbol, typeFlags, objectFlags); });
             }
-            if (right.flags & 262144) {
+            if (right.flags & 262144 /* Union */) {
                 return mapType(right, function (t) { return getSpreadType(left, t, symbol, typeFlags, objectFlags); });
             }
-            if (right.flags & (272 | 168 | 68 | 544 | 16777216 | 1048576)) {
+            if (right.flags & (272 /* BooleanLike */ | 168 /* NumberLike */ | 68 /* StringLike */ | 544 /* EnumLike */ | 16777216 /* NonPrimitive */ | 1048576 /* Index */)) {
                 return left;
             }
             var members = ts.createSymbolTable();
@@ -30333,17 +37515,19 @@ var ts;
             var stringIndexInfo;
             var numberIndexInfo;
             if (left === emptyObjectType) {
-                stringIndexInfo = getIndexInfoOfType(right, 0);
-                numberIndexInfo = getIndexInfoOfType(right, 1);
+                // for the first spread element, left === emptyObjectType, so take the right's string indexer
+                stringIndexInfo = getIndexInfoOfType(right, 0 /* String */);
+                numberIndexInfo = getIndexInfoOfType(right, 1 /* Number */);
             }
             else {
-                stringIndexInfo = unionSpreadIndexInfos(getIndexInfoOfType(left, 0), getIndexInfoOfType(right, 0));
-                numberIndexInfo = unionSpreadIndexInfos(getIndexInfoOfType(left, 1), getIndexInfoOfType(right, 1));
+                stringIndexInfo = unionSpreadIndexInfos(getIndexInfoOfType(left, 0 /* String */), getIndexInfoOfType(right, 0 /* String */));
+                numberIndexInfo = unionSpreadIndexInfos(getIndexInfoOfType(left, 1 /* Number */), getIndexInfoOfType(right, 1 /* Number */));
             }
             for (var _i = 0, _a = getPropertiesOfType(right); _i < _a.length; _i++) {
                 var rightProp = _a[_i];
-                var isSetterWithoutGetter = rightProp.flags & 65536 && !(rightProp.flags & 32768);
-                if (ts.getDeclarationModifierFlagsFromSymbol(rightProp) & (8 | 16)) {
+                // we approximate own properties as non-methods plus methods that are inside the object literal
+                var isSetterWithoutGetter = rightProp.flags & 65536 /* SetAccessor */ && !(rightProp.flags & 32768 /* GetAccessor */);
+                if (ts.getDeclarationModifierFlagsFromSymbol(rightProp) & (8 /* Private */ | 16 /* Protected */)) {
                     skippedPrivateMembers.set(rightProp.escapedName, true);
                 }
                 else if (!isClassMethod(rightProp) && !isSetterWithoutGetter) {
@@ -30352,7 +37536,7 @@ var ts;
             }
             for (var _b = 0, _c = getPropertiesOfType(left); _b < _c.length; _b++) {
                 var leftProp = _c[_b];
-                if (leftProp.flags & 65536 && !(leftProp.flags & 32768)
+                if (leftProp.flags & 65536 /* SetAccessor */ && !(leftProp.flags & 32768 /* GetAccessor */)
                     || skippedPrivateMembers.has(leftProp.escapedName)
                     || isClassMethod(leftProp)) {
                     continue;
@@ -30360,11 +37544,11 @@ var ts;
                 if (members.has(leftProp.escapedName)) {
                     var rightProp = members.get(leftProp.escapedName);
                     var rightType = getTypeOfSymbol(rightProp);
-                    if (rightProp.flags & 16777216) {
+                    if (rightProp.flags & 16777216 /* Optional */) {
                         var declarations = ts.concatenate(leftProp.declarations, rightProp.declarations);
-                        var flags = 4 | (leftProp.flags & 16777216);
+                        var flags = 4 /* Property */ | (leftProp.flags & 16777216 /* Optional */);
                         var result = createSymbol(flags, leftProp.escapedName);
-                        result.type = getUnionType([getTypeOfSymbol(leftProp), getTypeWithFacts(rightType, 131072)]);
+                        result.type = getUnionType([getTypeOfSymbol(leftProp), getTypeWithFacts(rightType, 131072 /* NEUndefined */)]);
                         result.leftSpread = leftProp;
                         result.rightSpread = rightProp;
                         result.declarations = declarations;
@@ -30377,15 +37561,15 @@ var ts;
                 }
             }
             var spread = createAnonymousType(symbol, members, ts.emptyArray, ts.emptyArray, getNonReadonlyIndexSignature(stringIndexInfo), getNonReadonlyIndexSignature(numberIndexInfo));
-            spread.flags |= typeFlags | 268435456;
-            spread.objectFlags |= objectFlags | (128 | 1024);
+            spread.flags |= typeFlags | 268435456 /* ContainsObjectLiteral */;
+            spread.objectFlags |= objectFlags | (128 /* ObjectLiteral */ | 1024 /* ContainsSpread */);
             return spread;
         }
         function getNonReadonlySymbol(prop) {
             if (!isReadonlySymbol(prop)) {
                 return prop;
             }
-            var flags = 4 | (prop.flags & 16777216);
+            var flags = 4 /* Property */ | (prop.flags & 16777216 /* Optional */);
             var result = createSymbol(flags, prop.escapedName);
             result.type = getTypeOfSymbol(prop);
             result.declarations = prop.declarations;
@@ -30395,12 +37579,12 @@ var ts;
         }
         function getNonReadonlyIndexSignature(index) {
             if (index && index.isReadonly) {
-                return createIndexInfo(index.type, false, index.declaration);
+                return createIndexInfo(index.type, /*isReadonly*/ false, index.declaration);
             }
             return index;
         }
         function isClassMethod(prop) {
-            return prop.flags & 8192 && ts.find(prop.declarations, function (decl) { return ts.isClassLike(decl.parent); });
+            return prop.flags & 8192 /* Method */ && ts.find(prop.declarations, function (decl) { return ts.isClassLike(decl.parent); });
         }
         function createLiteralType(flags, value, symbol) {
             var type = createType(flags);
@@ -30409,9 +37593,9 @@ var ts;
             return type;
         }
         function getFreshTypeOfLiteralType(type) {
-            if (type.flags & 192 && !(type.flags & 33554432)) {
+            if (type.flags & 192 /* StringOrNumberLiteral */ && !(type.flags & 33554432 /* FreshLiteral */)) {
                 if (!type.freshType) {
-                    var freshType = createLiteralType(type.flags | 33554432, type.value, type.symbol);
+                    var freshType = createLiteralType(type.flags | 33554432 /* FreshLiteral */, type.value, type.symbol);
                     freshType.regularType = type;
                     type.freshType = freshType;
                 }
@@ -30420,16 +37604,20 @@ var ts;
             return type;
         }
         function getRegularTypeOfLiteralType(type) {
-            return type.flags & 192 && type.flags & 33554432 ? type.regularType :
-                type.flags & 262144 ? getUnionType(ts.sameMap(type.types, getRegularTypeOfLiteralType)) :
+            return type.flags & 192 /* StringOrNumberLiteral */ && type.flags & 33554432 /* FreshLiteral */ ? type.regularType :
+                type.flags & 262144 /* Union */ ? getUnionType(ts.sameMap(type.types, getRegularTypeOfLiteralType)) :
                     type;
         }
         function getLiteralType(value, enumId, symbol) {
+            // We store all literal types in a single map with keys of the form '#NNN' and '@SSS',
+            // where NNN is the text representation of a numeric literal and SSS are the characters
+            // of a string literal. For literal enum members we use 'EEE#NNN' and 'EEE@SSS', where
+            // EEE is a unique id for the containing enum type.
             var qualifier = typeof value === "number" ? "#" : "@";
             var key = enumId ? enumId + qualifier + value : qualifier + value;
             var type = literalTypes.get(key);
             if (!type) {
-                var flags = (typeof value === "number" ? 128 : 64) | (enumId ? 512 : 0);
+                var flags = (typeof value === "number" ? 128 /* NumberLiteral */ : 64 /* StringLiteral */) | (enumId ? 512 /* EnumLiteral */ : 0);
                 literalTypes.set(key, type = createLiteralType(flags, value, symbol));
             }
             return type;
@@ -30442,7 +37630,7 @@ var ts;
             return links.resolvedType;
         }
         function createUniqueESSymbolType(symbol) {
-            var type = createType(2048);
+            var type = createType(2048 /* UniqueESSymbol */);
             type.symbol = symbol;
             return type;
         }
@@ -30455,11 +37643,11 @@ var ts;
             return esSymbolType;
         }
         function getThisType(node) {
-            var container = ts.getThisContainer(node, false);
+            var container = ts.getThisContainer(node, /*includeArrowFunctions*/ false);
             var parent = container && container.parent;
-            if (parent && (ts.isClassLike(parent) || parent.kind === 236)) {
-                if (!ts.hasModifier(container, 32) &&
-                    (container.kind !== 155 || ts.isNodeDescendantOf(node, container.body))) {
+            if (parent && (ts.isClassLike(parent) || parent.kind === 236 /* InterfaceDeclaration */)) {
+                if (!ts.hasModifier(container, 32 /* Static */) &&
+                    (container.kind !== 155 /* Constructor */ || ts.isNodeDescendantOf(node, container.body))) {
                     return getDeclaredTypeOfClassOrInterface(getSymbolOfNode(parent)).thisType;
                 }
             }
@@ -30475,84 +37663,86 @@ var ts;
         }
         function getTypeFromTypeNode(node) {
             switch (node.kind) {
-                case 119:
-                case 279:
-                case 280:
+                case 119 /* AnyKeyword */:
+                case 279 /* JSDocAllType */:
+                case 280 /* JSDocUnknownType */:
                     return anyType;
-                case 142:
+                case 142 /* UnknownKeyword */:
                     return unknownType;
-                case 137:
+                case 137 /* StringKeyword */:
                     return stringType;
-                case 134:
+                case 134 /* NumberKeyword */:
                     return numberType;
-                case 122:
+                case 122 /* BooleanKeyword */:
                     return booleanType;
-                case 138:
+                case 138 /* SymbolKeyword */:
                     return esSymbolType;
-                case 105:
+                case 105 /* VoidKeyword */:
                     return voidType;
-                case 140:
+                case 140 /* UndefinedKeyword */:
                     return undefinedType;
-                case 95:
+                case 95 /* NullKeyword */:
                     return nullType;
-                case 131:
+                case 131 /* NeverKeyword */:
                     return neverType;
-                case 135:
-                    return node.flags & 65536 ? anyType : nonPrimitiveType;
-                case 174:
-                case 99:
+                case 135 /* ObjectKeyword */:
+                    return node.flags & 65536 /* JavaScriptFile */ ? anyType : nonPrimitiveType;
+                case 174 /* ThisType */:
+                case 99 /* ThisKeyword */:
                     return getTypeFromThisTypeNode(node);
-                case 178:
+                case 178 /* LiteralType */:
                     return getTypeFromLiteralTypeNode(node);
-                case 162:
+                case 162 /* TypeReference */:
                     return getTypeFromTypeReference(node);
-                case 161:
+                case 161 /* TypePredicate */:
                     return booleanType;
-                case 207:
+                case 207 /* ExpressionWithTypeArguments */:
                     return getTypeFromTypeReference(node);
-                case 165:
+                case 165 /* TypeQuery */:
                     return getTypeFromTypeQueryNode(node);
-                case 167:
+                case 167 /* ArrayType */:
                     return getTypeFromArrayTypeNode(node);
-                case 168:
+                case 168 /* TupleType */:
                     return getTypeFromTupleTypeNode(node);
-                case 169:
+                case 169 /* UnionType */:
                     return getTypeFromUnionTypeNode(node);
-                case 170:
+                case 170 /* IntersectionType */:
                     return getTypeFromIntersectionTypeNode(node);
-                case 281:
+                case 281 /* JSDocNullableType */:
                     return getTypeFromJSDocNullableTypeNode(node);
-                case 283:
+                case 283 /* JSDocOptionalType */:
                     return addOptionality(getTypeFromTypeNode(node.type));
-                case 173:
-                case 282:
-                case 278:
+                case 173 /* ParenthesizedType */:
+                case 282 /* JSDocNonNullableType */:
+                case 278 /* JSDocTypeExpression */:
                     return getTypeFromTypeNode(node.type);
-                case 285:
+                case 285 /* JSDocVariadicType */:
                     return getTypeFromJSDocVariadicType(node);
-                case 163:
-                case 164:
-                case 166:
-                case 287:
-                case 284:
-                case 288:
+                case 163 /* FunctionType */:
+                case 164 /* ConstructorType */:
+                case 166 /* TypeLiteral */:
+                case 287 /* JSDocTypeLiteral */:
+                case 284 /* JSDocFunctionType */:
+                case 288 /* JSDocSignature */:
                     return getTypeFromTypeLiteralOrFunctionOrConstructorTypeNode(node);
-                case 175:
+                case 175 /* TypeOperator */:
                     return getTypeFromTypeOperatorNode(node);
-                case 176:
+                case 176 /* IndexedAccessType */:
                     return getTypeFromIndexedAccessTypeNode(node);
-                case 177:
+                case 177 /* MappedType */:
                     return getTypeFromMappedTypeNode(node);
-                case 171:
+                case 171 /* ConditionalType */:
                     return getTypeFromConditionalTypeNode(node);
-                case 172:
+                case 172 /* InferType */:
                     return getTypeFromInferTypeNode(node);
-                case 179:
+                case 179 /* ImportType */:
                     return getTypeFromImportTypeNode(node);
-                case 71:
-                case 146:
+                // This function assumes that an identifier or qualified name is a type expression
+                // Callers should first ensure this by calling isTypeNode
+                case 71 /* Identifier */:
+                case 146 /* QualifiedName */:
                     var symbol = getSymbolAtLocation(node);
-                    return (symbol && getDeclaredTypeOfSymbol(symbol));
+                    return (symbol && getDeclaredTypeOfSymbol(symbol)); // TODO: GH#18217
                 default:
                     return errorType;
             }
@@ -30603,8 +37793,12 @@ var ts;
                     makeArrayTypeMapper(sources, targets);
         }
         function createTypeEraser(sources) {
-            return createTypeMapper(sources, undefined);
+            return createTypeMapper(sources, /*targets*/ undefined);
         }
+        /**
+         * Maps forward-references to later types parameters to the empty object type.
+         * This is used during inference when instantiating type parameter defaults.
+         */
         function createBackreferenceMapper(typeParameters, index) {
             return function (t) { return typeParameters.indexOf(t) >= index ? emptyObjectType : t; };
         }
@@ -30613,7 +37807,7 @@ var ts;
         }
         function cloneTypeMapper(mapper) {
             return mapper && isInferenceContext(mapper) ?
-                createInferenceContext(mapper.typeParameters, mapper.signature, mapper.flags | 2, mapper.compareTypes, mapper.inferences) :
+                createInferenceContext(mapper.typeParameters, mapper.signature, mapper.flags | 2 /* NoDefault */, mapper.compareTypes, mapper.inferences) :
                 mapper;
         }
         function combineTypeMappers(mapper1, mapper2) {
@@ -30627,10 +37821,10 @@ var ts;
             return function (t) { return t === source ? target : baseMapper(t); };
         }
         function wildcardMapper(type) {
-            return type.flags & 65536 ? wildcardType : type;
+            return type.flags & 65536 /* TypeParameter */ ? wildcardType : type;
         }
         function cloneTypeParameter(typeParameter) {
-            var result = createType(65536);
+            var result = createType(65536 /* TypeParameter */);
             result.symbol = typeParameter.symbol;
             result.target = typeParameter;
             return result;
@@ -30638,7 +37832,7 @@ var ts;
         function instantiateTypePredicate(predicate, mapper) {
             if (ts.isIdentifierTypePredicate(predicate)) {
                 return {
-                    kind: 1,
+                    kind: 1 /* Identifier */,
                     parameterName: predicate.parameterName,
                     parameterIndex: predicate.parameterIndex,
                     type: instantiateType(predicate.type, mapper)
@@ -30646,7 +37840,7 @@ var ts;
             }
             else {
                 return {
-                    kind: 0,
+                    kind: 0 /* This */,
                     type: instantiateType(predicate.type, mapper)
                 };
             }
@@ -30654,6 +37848,9 @@ var ts;
         function instantiateSignature(signature, mapper, eraseTypeParameters) {
             var freshTypeParameters;
             if (signature.typeParameters && !eraseTypeParameters) {
+                // First create a fresh set of type parameters, then include a mapping from the old to the
+                // new type parameters in the mapper function. Finally store this mapper in the new type
+                // parameters such that we can use it when instantiating constraints.
                 freshTypeParameters = ts.map(signature.typeParameters, cloneTypeParameter);
                 mapper = combineTypeMappers(createTypeMapper(signature.typeParameters, freshTypeParameters), mapper);
                 for (var _i = 0, freshTypeParameters_1 = freshTypeParameters; _i < freshTypeParameters_1.length; _i++) {
@@ -30661,21 +37858,33 @@ var ts;
                     tp.mapper = mapper;
                 }
             }
-            var result = createSignature(signature.declaration, freshTypeParameters, signature.thisParameter && instantiateSymbol(signature.thisParameter, mapper), instantiateList(signature.parameters, mapper, instantiateSymbol), undefined, undefined, signature.minArgumentCount, signature.hasRestParameter, signature.hasLiteralTypes);
+            // Don't compute resolvedReturnType and resolvedTypePredicate now,
+            // because using `mapper` now could trigger inferences to become fixed. (See `createInferenceContext`.)
+            // See GH#17600.
+            var result = createSignature(signature.declaration, freshTypeParameters, signature.thisParameter && instantiateSymbol(signature.thisParameter, mapper), instantiateList(signature.parameters, mapper, instantiateSymbol), 
+            /*resolvedReturnType*/ undefined, 
+            /*resolvedTypePredicate*/ undefined, signature.minArgumentCount, signature.hasRestParameter, signature.hasLiteralTypes);
             result.target = signature;
             result.mapper = mapper;
             return result;
         }
         function instantiateSymbol(symbol, mapper) {
             var links = getSymbolLinks(symbol);
-            if (links.type && !maybeTypeOfKind(links.type, 131072 | 15794176)) {
+            if (links.type && !maybeTypeOfKind(links.type, 131072 /* Object */ | 15794176 /* Instantiable */)) {
+                // If the type of the symbol is already resolved, and if that type could not possibly
+                // be affected by instantiation, simply return the symbol itself.
                 return symbol;
             }
-            if (ts.getCheckFlags(symbol) & 1) {
+            if (ts.getCheckFlags(symbol) & 1 /* Instantiated */) {
+                // If symbol being instantiated is itself a instantiation, fetch the original target and combine the
+                // type mappers. This ensures that original type identities are properly preserved and that aliases
+                // always reference a non-aliases.
                 symbol = links.target;
                 mapper = combineTypeMappers(links.mapper, mapper);
             }
-            var result = createSymbol(symbol.flags, symbol.escapedName, 1 | (ts.getCheckFlags(symbol) & 1024));
+            // Keep the flags from the symbol we're instantiating.  Mark that is instantiated, and
+            // also transient so that we can just store data on it directly.
+            var result = createSymbol(symbol.flags, symbol.escapedName, 1 /* Instantiated */ | (ts.getCheckFlags(symbol) & 1024 /* Late */));
             result.declarations = symbol.declarations;
             result.parent = symbol.parent;
             result.target = symbol;
@@ -30694,11 +37903,15 @@ var ts;
             return result;
         }
         function getAnonymousTypeInstantiation(type, mapper) {
-            var target = type.objectFlags & 64 ? type.target : type;
+            var target = type.objectFlags & 64 /* Instantiated */ ? type.target : type;
             var symbol = target.symbol;
             var links = getSymbolLinks(symbol);
             var typeParameters = links.outerTypeParameters;
             if (!typeParameters) {
+                // The first time an anonymous type is instantiated we compute and store a list of the type
+                // parameters that are in scope (and therefore potentially referenced). For type literals that
+                // aren't the right hand side of a generic type alias declaration we optimize by reducing the
+                // set of type parameters to those that are possibly referenced in the literal.
                 var declaration_1 = symbol.declarations[0];
                 if (ts.isInJavaScriptFile(declaration_1)) {
                     var paramTag = ts.findAncestor(declaration_1, ts.isJSDocParameterTag);
@@ -30709,13 +37922,13 @@ var ts;
                         }
                     }
                 }
-                var outerTypeParameters = getOuterTypeParameters(declaration_1, true);
+                var outerTypeParameters = getOuterTypeParameters(declaration_1, /*includeThisTypes*/ true);
                 if (isJavaScriptConstructor(declaration_1)) {
                     var templateTagParameters = getTypeParametersFromDeclaration(declaration_1);
                     outerTypeParameters = ts.addRange(outerTypeParameters, templateTagParameters);
                 }
                 typeParameters = outerTypeParameters || ts.emptyArray;
-                typeParameters = symbol.flags & 2048 && !target.aliasTypeArguments ?
+                typeParameters = symbol.flags & 2048 /* TypeLiteral */ && !target.aliasTypeArguments ?
                     ts.filter(typeParameters, function (tp) { return isTypeParameterPossiblyReferenced(tp, declaration_1); }) :
                     typeParameters;
                 links.outerTypeParameters = typeParameters;
@@ -30725,13 +37938,16 @@ var ts;
                 }
             }
             if (typeParameters.length) {
-                var combinedMapper = type.objectFlags & 64 ? combineTypeMappers(type.mapper, mapper) : mapper;
+                // We are instantiating an anonymous type that has one or more type parameters in scope. Apply the
+                // mapper to the type parameters to produce the effective list of type arguments, and compute the
+                // instantiation cache key from the type IDs of the type arguments.
+                var combinedMapper = type.objectFlags & 64 /* Instantiated */ ? combineTypeMappers(type.mapper, mapper) : mapper;
                 var typeArguments = ts.map(typeParameters, combinedMapper);
                 var id = getTypeListId(typeArguments);
                 var result = links.instantiations.get(id);
                 if (!result) {
                     var newMapper = createTypeMapper(typeParameters, typeArguments);
-                    result = target.objectFlags & 32 ? instantiateMappedType(target, newMapper) : instantiateAnonymousType(target, newMapper);
+                    result = target.objectFlags & 32 /* Mapped */ ? instantiateMappedType(target, newMapper) : instantiateAnonymousType(target, newMapper);
                     links.instantiations.set(id, result);
                 }
                 return result;
@@ -30739,35 +37955,43 @@ var ts;
             return type;
         }
         function maybeTypeParameterReference(node) {
-            return !(node.kind === 146 ||
-                node.parent.kind === 162 && node.parent.typeArguments && node === node.parent.typeName);
+            return !(node.kind === 146 /* QualifiedName */ ||
+                node.parent.kind === 162 /* TypeReference */ && node.parent.typeArguments && node === node.parent.typeName);
         }
         function isTypeParameterPossiblyReferenced(tp, node) {
+            // If the type parameter doesn't have exactly one declaration, if there are invening statement blocks
+            // between the node and the type parameter declaration, if the node contains actual references to the
+            // type parameter, or if the node contains type queries, we consider the type parameter possibly referenced.
             if (tp.symbol && tp.symbol.declarations && tp.symbol.declarations.length === 1) {
                 var container_3 = tp.symbol.declarations[0].parent;
-                if (ts.findAncestor(node, function (n) { return n.kind === 213 ? "quit" : n === container_3; })) {
+                if (ts.findAncestor(node, function (n) { return n.kind === 213 /* Block */ ? "quit" : n === container_3; })) {
                     return !!ts.forEachChild(node, containsReference);
                 }
             }
             return true;
             function containsReference(node) {
                 switch (node.kind) {
-                    case 174:
+                    case 174 /* ThisType */:
                         return !!tp.isThisType;
-                    case 71:
+                    case 71 /* Identifier */:
                         return !tp.isThisType && ts.isPartOfTypeNode(node) && maybeTypeParameterReference(node) &&
                             getTypeFromTypeNode(node) === tp;
-                    case 165:
+                    case 165 /* TypeQuery */:
                         return true;
                 }
                 return !!ts.forEachChild(node, containsReference);
             }
         }
         function instantiateMappedType(type, mapper) {
+            // Check if we have a homomorphic mapped type, i.e. a type of the form { [P in keyof T]: X } for some
+            // type variable T. If so, the mapped type is distributive over a union type and when T is instantiated
+            // to a union type A | B, we produce { [P in keyof A]: X } | { [P in keyof B]: X }. Furthermore, for
+            // homomorphic mapped types we leave primitive types alone. For example, when T is instantiated to a
+            // union type A | undefined, we produce { [P in keyof A]: X } | undefined.
             var constraintType = getConstraintTypeFromMappedType(type);
-            if (constraintType.flags & 1048576) {
+            if (constraintType.flags & 1048576 /* Index */) {
                 var typeVariable_1 = constraintType.type;
-                if (typeVariable_1.flags & 65536) {
+                if (typeVariable_1.flags & 65536 /* TypeParameter */) {
                     var mappedTypeVariable = instantiateType(typeVariable_1, mapper);
                     if (typeVariable_1 !== mappedTypeVariable) {
                         return mapType(mappedTypeVariable, function (t) {
@@ -30782,11 +38006,11 @@ var ts;
             return instantiateAnonymousType(type, mapper);
         }
         function isMappableType(type) {
-            return type.flags & (3 | 14745600 | 131072 | 524288);
+            return type.flags & (3 /* AnyOrUnknown */ | 14745600 /* InstantiableNonPrimitive */ | 131072 /* Object */ | 524288 /* Intersection */);
         }
         function instantiateAnonymousType(type, mapper) {
-            var result = createObjectType(type.objectFlags | 64, type.symbol);
-            if (type.objectFlags & 32) {
+            var result = createObjectType(type.objectFlags | 64 /* Instantiated */, type.symbol);
+            if (type.objectFlags & 32 /* Mapped */) {
                 result.declaration = type.declaration;
             }
             result.target = type;
@@ -30798,6 +38022,9 @@ var ts;
         function getConditionalTypeInstantiation(type, mapper) {
             var root = type.root;
             if (root.outerTypeParameters) {
+                // We are instantiating a conditional type that has one or more type parameters in scope. Apply the
+                // mapper to the type parameters to produce the effective list of type arguments, and compute the
+                // instantiation cache key from the type IDs of the type arguments.
                 var typeArguments = ts.map(root.outerTypeParameters, mapper);
                 var id = getTypeListId(typeArguments);
                 var result = root.instantiations.get(id);
@@ -30811,10 +38038,13 @@ var ts;
             return type;
         }
         function instantiateConditionalType(root, mapper) {
+            // Check if we have a conditional type where the check type is a naked type parameter. If so,
+            // the conditional type is distributive over union types and when T is instantiated to a union
+            // type A | B, we produce (A extends U ? X : Y) | (B extends U ? X : Y).
             if (root.isDistributive) {
                 var checkType_1 = root.checkType;
                 var instantiatedType = mapper(checkType_1);
-                if (checkType_1 !== instantiatedType && instantiatedType.flags & (262144 | 32768)) {
+                if (checkType_1 !== instantiatedType && instantiatedType.flags & (262144 /* Union */ | 32768 /* Never */)) {
                     return mapType(instantiatedType, function (t) { return getConditionalType(root, createReplacementMapper(checkType_1, t, mapper)); });
                 }
             }
@@ -30822,83 +38052,90 @@ var ts;
         }
         function instantiateType(type, mapper) {
             if (type && mapper && mapper !== identityMapper) {
-                if (type.flags & 65536) {
+                if (type.flags & 65536 /* TypeParameter */) {
                     return mapper(type);
                 }
-                if (type.flags & 131072) {
-                    if (type.objectFlags & 16) {
-                        return type.symbol && type.symbol.flags & (16 | 8192 | 32 | 2048 | 4096) && type.symbol.declarations ?
+                if (type.flags & 131072 /* Object */) {
+                    if (type.objectFlags & 16 /* Anonymous */) {
+                        // If the anonymous type originates in a declaration of a function, method, class, or
+                        // interface, in an object type literal, or in an object literal expression, we may need
+                        // to instantiate the type because it might reference a type parameter.
+                        return type.symbol && type.symbol.flags & (16 /* Function */ | 8192 /* Method */ | 32 /* Class */ | 2048 /* TypeLiteral */ | 4096 /* ObjectLiteral */) && type.symbol.declarations ?
                             getAnonymousTypeInstantiation(type, mapper) : type;
                     }
-                    if (type.objectFlags & 32) {
+                    if (type.objectFlags & 32 /* Mapped */) {
                         return getAnonymousTypeInstantiation(type, mapper);
                     }
-                    if (type.objectFlags & 4) {
+                    if (type.objectFlags & 4 /* Reference */) {
                         var typeArguments = type.typeArguments;
                         var newTypeArguments = instantiateTypes(typeArguments, mapper);
                         return newTypeArguments !== typeArguments ? createTypeReference(type.target, newTypeArguments) : type;
                     }
                 }
-                if (type.flags & 262144 && !(type.flags & 32764)) {
+                if (type.flags & 262144 /* Union */ && !(type.flags & 32764 /* Primitive */)) {
                     var types = type.types;
                     var newTypes = instantiateTypes(types, mapper);
-                    return newTypes !== types ? getUnionType(newTypes, 1, type.aliasSymbol, instantiateTypes(type.aliasTypeArguments, mapper)) : type;
+                    return newTypes !== types ? getUnionType(newTypes, 1 /* Literal */, type.aliasSymbol, instantiateTypes(type.aliasTypeArguments, mapper)) : type;
                 }
-                if (type.flags & 524288) {
+                if (type.flags & 524288 /* Intersection */) {
                     var types = type.types;
                     var newTypes = instantiateTypes(types, mapper);
                     return newTypes !== types ? getIntersectionType(newTypes, type.aliasSymbol, instantiateTypes(type.aliasTypeArguments, mapper)) : type;
                 }
-                if (type.flags & 1048576) {
+                if (type.flags & 1048576 /* Index */) {
                     return getIndexType(instantiateType(type.type, mapper));
                 }
-                if (type.flags & 2097152) {
+                if (type.flags & 2097152 /* IndexedAccess */) {
                     return getIndexedAccessType(instantiateType(type.objectType, mapper), instantiateType(type.indexType, mapper));
                 }
-                if (type.flags & 4194304) {
+                if (type.flags & 4194304 /* Conditional */) {
                     return getConditionalTypeInstantiation(type, combineTypeMappers(type.mapper, mapper));
                 }
-                if (type.flags & 8388608) {
+                if (type.flags & 8388608 /* Substitution */) {
                     return instantiateType(type.typeVariable, mapper);
                 }
             }
             return type;
         }
         function getWildcardInstantiation(type) {
-            return type.flags & (32764 | 3 | 32768) ? type :
+            return type.flags & (32764 /* Primitive */ | 3 /* AnyOrUnknown */ | 32768 /* Never */) ? type :
                 type.wildcardInstantiation || (type.wildcardInstantiation = instantiateType(type, wildcardMapper));
         }
         function instantiateIndexInfo(info, mapper) {
             return info && createIndexInfo(instantiateType(info.type, mapper), info.isReadonly, info.declaration);
         }
+        // Returns true if the given expression contains (at any level of nesting) a function or arrow expression
+        // that is subject to contextual typing.
         function isContextSensitive(node) {
-            ts.Debug.assert(node.kind !== 154 || ts.isObjectLiteralMethod(node));
+            ts.Debug.assert(node.kind !== 154 /* MethodDeclaration */ || ts.isObjectLiteralMethod(node));
             switch (node.kind) {
-                case 192:
-                case 193:
-                case 154:
+                case 192 /* FunctionExpression */:
+                case 193 /* ArrowFunction */:
+                case 154 /* MethodDeclaration */:
                     return isContextSensitiveFunctionLikeDeclaration(node);
-                case 184:
+                case 184 /* ObjectLiteralExpression */:
                     return ts.some(node.properties, isContextSensitive);
-                case 183:
+                case 183 /* ArrayLiteralExpression */:
                     return ts.some(node.elements, isContextSensitive);
-                case 201:
+                case 201 /* ConditionalExpression */:
                     return isContextSensitive(node.whenTrue) ||
                         isContextSensitive(node.whenFalse);
-                case 200:
-                    return node.operatorToken.kind === 54 &&
+                case 200 /* BinaryExpression */:
+                    return node.operatorToken.kind === 54 /* BarBarToken */ &&
                         (isContextSensitive(node.left) || isContextSensitive(node.right));
-                case 270:
+                case 270 /* PropertyAssignment */:
                     return isContextSensitive(node.initializer);
-                case 191:
+                case 191 /* ParenthesizedExpression */:
                     return isContextSensitive(node.expression);
-                case 263:
+                case 263 /* JsxAttributes */:
                     return ts.some(node.properties, isContextSensitive);
-                case 262: {
+                case 262 /* JsxAttribute */: {
+                    // If there is no initializer, JSX attribute has a boolean value of true which is not context sensitive.
                     var initializer = node.initializer;
                     return !!initializer && isContextSensitive(initializer);
                 }
-                case 265: {
+                case 265 /* JsxExpression */: {
+                    // It is possible to that node.expression is undefined (e.g <div x={} />)
                     var expression = node.expression;
                     return !!expression && isContextSensitive(expression);
                 }
@@ -30906,30 +38143,35 @@ var ts;
             return false;
         }
         function isContextSensitiveFunctionLikeDeclaration(node) {
+            // Functions with type parameters are not context sensitive.
             if (node.typeParameters) {
                 return false;
             }
+            // Functions with any parameters that lack type annotations are context sensitive.
             if (ts.some(node.parameters, function (p) { return !ts.getEffectiveTypeAnnotationNode(p); })) {
                 return true;
             }
-            if (node.kind !== 193) {
+            if (node.kind !== 193 /* ArrowFunction */) {
+                // If the first parameter is not an explicit 'this' parameter, then the function has
+                // an implicit 'this' parameter which is subject to contextual typing.
                 var parameter = ts.firstOrUndefined(node.parameters);
                 if (!(parameter && ts.parameterIsThisKeyword(parameter))) {
                     return true;
                 }
             }
+            // TODO(anhans): A block should be context-sensitive if it has a context-sensitive return value.
             var body = node.body;
-            return body.kind === 213 ? false : isContextSensitive(body);
+            return body.kind === 213 /* Block */ ? false : isContextSensitive(body);
         }
         function isContextSensitiveFunctionOrObjectLiteralMethod(func) {
             return (ts.isInJavaScriptFile(func) && ts.isFunctionDeclaration(func) || isFunctionExpressionOrArrowFunction(func) || ts.isObjectLiteralMethod(func)) &&
                 isContextSensitiveFunctionLikeDeclaration(func);
         }
         function getTypeWithoutSignatures(type) {
-            if (type.flags & 131072) {
+            if (type.flags & 131072 /* Object */) {
                 var resolved = resolveStructuredTypeMembers(type);
                 if (resolved.constructSignatures.length) {
-                    var result = createObjectType(16, type.symbol);
+                    var result = createObjectType(16 /* Anonymous */, type.symbol);
                     result.members = resolved.members;
                     result.properties = resolved.properties;
                     result.callSignatures = ts.emptyArray;
@@ -30937,19 +38179,20 @@ var ts;
                     return result;
                 }
             }
-            else if (type.flags & 524288) {
+            else if (type.flags & 524288 /* Intersection */) {
                 return getIntersectionType(ts.map(type.types, getTypeWithoutSignatures));
             }
             return type;
         }
+        // TYPE CHECKING
         function isTypeIdenticalTo(source, target) {
             return isTypeRelatedTo(source, target, identityRelation);
         }
         function compareTypesIdentical(source, target) {
-            return isTypeRelatedTo(source, target, identityRelation) ? -1 : 0;
+            return isTypeRelatedTo(source, target, identityRelation) ? -1 /* True */ : 0 /* False */;
         }
         function compareTypesAssignable(source, target) {
-            return isTypeRelatedTo(source, target, assignableRelation) ? -1 : 0;
+            return isTypeRelatedTo(source, target, assignableRelation) ? -1 /* True */ : 0 /* False */;
         }
         function isTypeSubtypeOf(source, target) {
             return isTypeRelatedTo(source, target, subtypeRelation);
@@ -30957,13 +38200,31 @@ var ts;
         function isTypeAssignableTo(source, target) {
             return isTypeRelatedTo(source, target, assignableRelation);
         }
+        // An object type S is considered to be derived from an object type T if
+        // S is a union type and every constituent of S is derived from T,
+        // T is a union type and S is derived from at least one constituent of T, or
+        // S is a type variable with a base constraint that is derived from T,
+        // T is one of the global types Object and Function and S is a subtype of T, or
+        // T occurs directly or indirectly in an 'extends' clause of S.
+        // Note that this check ignores type parameters and only considers the
+        // inheritance hierarchy.
         function isTypeDerivedFrom(source, target) {
-            return source.flags & 262144 ? ts.every(source.types, function (t) { return isTypeDerivedFrom(t, target); }) :
-                target.flags & 262144 ? ts.some(target.types, function (t) { return isTypeDerivedFrom(source, t); }) :
-                    source.flags & 14745600 ? isTypeDerivedFrom(getBaseConstraintOfType(source) || emptyObjectType, target) :
+            return source.flags & 262144 /* Union */ ? ts.every(source.types, function (t) { return isTypeDerivedFrom(t, target); }) :
+                target.flags & 262144 /* Union */ ? ts.some(target.types, function (t) { return isTypeDerivedFrom(source, t); }) :
+                    source.flags & 14745600 /* InstantiableNonPrimitive */ ? isTypeDerivedFrom(getBaseConstraintOfType(source) || emptyObjectType, target) :
                         target === globalObjectType || target === globalFunctionType ? isTypeSubtypeOf(source, target) :
                             hasBaseType(source, getTargetType(target));
         }
+        /**
+         * This is *not* a bi-directional relationship.
+         * If one needs to check both directions for comparability, use a second call to this function or 'checkTypeComparableTo'.
+         *
+         * A type S is comparable to a type T if some (but not necessarily all) of the possible values of S are also possible values of T.
+         * It is used to check following cases:
+         *   - the types of the left and right sides of equality/inequality operators (`===`, `!==`, `==`, `!=`).
+         *   - the types of `case` clause expressions and their respective `switch` expressions.
+         *   - the type of an expression in a type assertion with the type being asserted.
+         */
         function isTypeComparableTo(source, target) {
             return isTypeRelatedTo(source, target, comparableRelation);
         }
@@ -30973,38 +38234,48 @@ var ts;
         function checkTypeAssignableTo(source, target, errorNode, headMessage, containingMessageChain) {
             return checkTypeRelatedTo(source, target, assignableRelation, errorNode, headMessage, containingMessageChain);
         }
+        /**
+         * This is *not* a bi-directional relationship.
+         * If one needs to check both directions for comparability, use a second call to this function or 'isTypeComparableTo'.
+         */
         function checkTypeComparableTo(source, target, errorNode, headMessage, containingMessageChain) {
             return checkTypeRelatedTo(source, target, comparableRelation, errorNode, headMessage, containingMessageChain);
         }
         function isSignatureAssignableTo(source, target, ignoreReturnTypes) {
-            return compareSignaturesRelated(source, target, 0, ignoreReturnTypes, false, undefined, compareTypesAssignable) !== 0;
+            return compareSignaturesRelated(source, target, 0 /* None */, ignoreReturnTypes, /*reportErrors*/ false, 
+            /*errorReporter*/ undefined, compareTypesAssignable) !== 0 /* False */;
         }
+        /**
+         * See signatureRelatedTo, compareSignaturesIdentical
+         */
         function compareSignaturesRelated(source, target, callbackCheck, ignoreReturnTypes, reportErrors, errorReporter, compareTypes) {
+            // TODO (drosen): De-duplicate code between related functions.
             if (source === target) {
-                return -1;
+                return -1 /* True */;
             }
             if (!target.hasRestParameter && source.minArgumentCount > target.parameters.length) {
-                return 0;
+                return 0 /* False */;
             }
             if (source.typeParameters && source.typeParameters !== target.typeParameters) {
                 target = getCanonicalSignature(target);
-                source = instantiateSignatureInContextOf(source, target, undefined, compareTypes);
+                source = instantiateSignatureInContextOf(source, target, /*contextualMapper*/ undefined, compareTypes);
             }
-            var kind = target.declaration ? target.declaration.kind : 0;
-            var strictVariance = !callbackCheck && strictFunctionTypes && kind !== 154 &&
-                kind !== 153 && kind !== 155;
-            var result = -1;
+            var kind = target.declaration ? target.declaration.kind : 0 /* Unknown */;
+            var strictVariance = !callbackCheck && strictFunctionTypes && kind !== 154 /* MethodDeclaration */ &&
+                kind !== 153 /* MethodSignature */ && kind !== 155 /* Constructor */;
+            var result = -1 /* True */;
             var sourceThisType = getThisTypeOfSignature(source);
             if (sourceThisType && sourceThisType !== voidType) {
                 var targetThisType = getThisTypeOfSignature(target);
                 if (targetThisType) {
-                    var related = !strictVariance && compareTypes(sourceThisType, targetThisType, false)
+                    // void sources are assignable to anything.
+                    var related = !strictVariance && compareTypes(sourceThisType, targetThisType, /*reportErrors*/ false)
                         || compareTypes(targetThisType, sourceThisType, reportErrors);
                     if (!related) {
                         if (reportErrors) {
                             errorReporter(ts.Diagnostics.The_this_types_of_each_signature_are_incompatible);
                         }
-                        return 0;
+                        return 0 /* False */;
                     }
                     result &= related;
                 }
@@ -31017,18 +38288,27 @@ var ts;
             for (var i = 0; i < checkCount; i++) {
                 var sourceType = i < sourceMax ? getTypeOfParameter(sourceParams[i]) : getRestTypeOfSignature(source);
                 var targetType = i < targetMax ? getTypeOfParameter(targetParams[i]) : getRestTypeOfSignature(target);
+                // In order to ensure that any generic type Foo<T> is at least co-variant with respect to T no matter
+                // how Foo uses T, we need to relate parameters bi-variantly (given that parameters are input positions,
+                // they naturally relate only contra-variantly). However, if the source and target parameters both have
+                // function types with a single call signature, we know we are relating two callback parameters. In
+                // that case it is sufficient to only relate the parameters of the signatures co-variantly because,
+                // similar to return values, callback parameters are output positions. This means that a Promise<T>,
+                // where T is used only in callback parameter positions, will be co-variant (as opposed to bi-variant)
+                // with respect to T.
                 var sourceSig = callbackCheck ? undefined : getSingleCallSignature(getNonNullableType(sourceType));
                 var targetSig = callbackCheck ? undefined : getSingleCallSignature(getNonNullableType(targetType));
                 var callbacks = sourceSig && targetSig && !signatureHasTypePredicate(sourceSig) && !signatureHasTypePredicate(targetSig) &&
-                    (getFalsyFlags(sourceType) & 24576) === (getFalsyFlags(targetType) & 24576);
+                    (getFalsyFlags(sourceType) & 24576 /* Nullable */) === (getFalsyFlags(targetType) & 24576 /* Nullable */);
                 var related = callbacks ?
-                    compareSignaturesRelated(targetSig, sourceSig, strictVariance ? 2 : 1, false, reportErrors, errorReporter, compareTypes) :
-                    !callbackCheck && !strictVariance && compareTypes(sourceType, targetType, false) || compareTypes(targetType, sourceType, reportErrors);
+                    // TODO: GH#18217 It will work if they're both `undefined`, but not if only one is
+                    compareSignaturesRelated(targetSig, sourceSig, strictVariance ? 2 /* Strict */ : 1 /* Bivariant */, /*ignoreReturnTypes*/ false, reportErrors, errorReporter, compareTypes) :
+                    !callbackCheck && !strictVariance && compareTypes(sourceType, targetType, /*reportErrors*/ false) || compareTypes(targetType, sourceType, reportErrors);
                 if (!related) {
                     if (reportErrors) {
                         errorReporter(ts.Diagnostics.Types_of_parameters_0_and_1_are_incompatible, ts.symbolName(sourceParams[i < sourceMax ? i : sourceMax]), ts.symbolName(targetParams[i < targetMax ? i : targetMax]));
                     }
-                    return 0;
+                    return 0 /* False */;
                 }
                 result &= related;
             }
@@ -31038,21 +38318,25 @@ var ts;
                     return result;
                 }
                 var sourceReturnType = getReturnTypeOfSignature(source);
+                // The following block preserves behavior forbidding boolean returning functions from being assignable to type guard returning functions
                 var targetTypePredicate = getTypePredicateOfSignature(target);
                 if (targetTypePredicate) {
                     var sourceTypePredicate = getTypePredicateOfSignature(source);
                     if (sourceTypePredicate) {
-                        result &= compareTypePredicateRelatedTo(sourceTypePredicate, targetTypePredicate, source.declaration, target.declaration, reportErrors, errorReporter, compareTypes);
+                        result &= compareTypePredicateRelatedTo(sourceTypePredicate, targetTypePredicate, source.declaration, target.declaration, reportErrors, errorReporter, compareTypes); // TODO: GH#18217
                     }
                     else if (ts.isIdentifierTypePredicate(targetTypePredicate)) {
                         if (reportErrors) {
                             errorReporter(ts.Diagnostics.Signature_0_must_be_a_type_predicate, signatureToString(source));
                         }
-                        return 0;
+                        return 0 /* False */;
                     }
                 }
                 else {
-                    result &= callbackCheck === 1 && compareTypes(targetReturnType, sourceReturnType, false) ||
+                    // When relating callback signatures, we still need to relate return types bi-variantly as otherwise
+                    // the containing type wouldn't be co-variant. For example, interface Foo<T> { add(cb: () => T): void }
+                    // wouldn't be co-variant for T without this rule.
+                    result &= callbackCheck === 1 /* Bivariant */ && compareTypes(targetReturnType, sourceReturnType, /*reportErrors*/ false) ||
                         compareTypes(sourceReturnType, targetReturnType, reportErrors);
                 }
             }
@@ -31064,9 +38348,9 @@ var ts;
                     errorReporter(ts.Diagnostics.A_this_based_type_guard_is_not_compatible_with_a_parameter_based_type_guard);
                     errorReporter(ts.Diagnostics.Type_predicate_0_is_not_assignable_to_1, typePredicateToString(source), typePredicateToString(target));
                 }
-                return 0;
+                return 0 /* False */;
             }
-            if (source.kind === 1) {
+            if (source.kind === 1 /* Identifier */) {
                 var targetPredicate = target;
                 var sourceIndex = source.parameterIndex - (ts.getThisParameter(sourceDeclaration) ? 1 : 0);
                 var targetIndex = targetPredicate.parameterIndex - (ts.getThisParameter(targetDeclaration) ? 1 : 0);
@@ -31075,11 +38359,11 @@ var ts;
                         errorReporter(ts.Diagnostics.Parameter_0_is_not_in_the_same_position_as_parameter_1, source.parameterName, targetPredicate.parameterName);
                         errorReporter(ts.Diagnostics.Type_predicate_0_is_not_assignable_to_1, typePredicateToString(source), typePredicateToString(target));
                     }
-                    return 0;
+                    return 0 /* False */;
                 }
             }
             var related = compareTypes(source.type, target.type, reportErrors);
-            if (related === 0 && reportErrors) {
+            if (related === 0 /* False */ && reportErrors) {
                 errorReporter(ts.Diagnostics.Type_predicate_0_is_not_assignable_to_1, typePredicateToString(source), typePredicateToString(target));
             }
             return related;
@@ -31087,12 +38371,13 @@ var ts;
         function isImplementationCompatibleWithOverload(implementation, overload) {
             var erasedSource = getErasedSignature(implementation);
             var erasedTarget = getErasedSignature(overload);
+            // First see if the return types are compatible in either direction.
             var sourceReturnType = getReturnTypeOfSignature(erasedSource);
             var targetReturnType = getReturnTypeOfSignature(erasedTarget);
             if (targetReturnType === voidType
                 || isTypeRelatedTo(targetReturnType, sourceReturnType, assignableRelation)
                 || isTypeRelatedTo(sourceReturnType, targetReturnType, assignableRelation)) {
-                return isSignatureAssignableTo(erasedSource, erasedTarget, true);
+                return isSignatureAssignableTo(erasedSource, erasedTarget, /*ignoreReturnTypes*/ true);
             }
             return false;
         }
@@ -31105,6 +38390,8 @@ var ts;
         function getNumParametersToCheckForSignatureRelatability(source, sourceNonRestParamCount, target, targetNonRestParamCount) {
             if (source.hasRestParameter === target.hasRestParameter) {
                 if (source.hasRestParameter) {
+                    // If both have rest parameters, get the max and add 1 to
+                    // compensate for the rest parameter.
                     return Math.max(sourceNonRestParamCount, targetNonRestParamCount) + 1;
                 }
                 else {
@@ -31112,6 +38399,7 @@ var ts;
                 }
             }
             else {
+                // Return the count for whichever signature doesn't have rest parameters.
                 return source.hasRestParameter ?
                     targetNonRestParamCount :
                     sourceNonRestParamCount;
@@ -31125,10 +38413,10 @@ var ts;
                 !t.numberIndexInfo;
         }
         function isEmptyObjectType(type) {
-            return type.flags & 131072 ? isEmptyResolvedType(resolveStructuredTypeMembers(type)) :
-                type.flags & 16777216 ? true :
-                    type.flags & 262144 ? ts.some(type.types, isEmptyObjectType) :
-                        type.flags & 524288 ? !ts.some(type.types, function (t) { return !isEmptyObjectType(t); }) :
+            return type.flags & 131072 /* Object */ ? isEmptyResolvedType(resolveStructuredTypeMembers(type)) :
+                type.flags & 16777216 /* NonPrimitive */ ? true :
+                    type.flags & 262144 /* Union */ ? ts.some(type.types, isEmptyObjectType) :
+                        type.flags & 524288 /* Intersection */ ? ts.every(type.types, isEmptyObjectType) :
                             false;
         }
         function isEnumTypeRelatedTo(sourceSymbol, targetSymbol, errorReporter) {
@@ -31140,18 +38428,18 @@ var ts;
             if (relation !== undefined) {
                 return relation;
             }
-            if (sourceSymbol.escapedName !== targetSymbol.escapedName || !(sourceSymbol.flags & 256) || !(targetSymbol.flags & 256)) {
+            if (sourceSymbol.escapedName !== targetSymbol.escapedName || !(sourceSymbol.flags & 256 /* RegularEnum */) || !(targetSymbol.flags & 256 /* RegularEnum */)) {
                 enumRelation.set(id, false);
                 return false;
             }
             var targetEnumType = getTypeOfSymbol(targetSymbol);
             for (var _i = 0, _a = getPropertiesOfType(getTypeOfSymbol(sourceSymbol)); _i < _a.length; _i++) {
                 var property = _a[_i];
-                if (property.flags & 8) {
+                if (property.flags & 8 /* EnumMember */) {
                     var targetProperty = getPropertyOfType(targetEnumType, property.escapedName);
-                    if (!targetProperty || !(targetProperty.flags & 8)) {
+                    if (!targetProperty || !(targetProperty.flags & 8 /* EnumMember */)) {
                         if (errorReporter) {
-                            errorReporter(ts.Diagnostics.Property_0_is_missing_in_type_1, ts.symbolName(property), typeToString(getDeclaredTypeOfSymbol(targetSymbol), undefined, 64));
+                            errorReporter(ts.Diagnostics.Property_0_is_missing_in_type_1, ts.symbolName(property), typeToString(getDeclaredTypeOfSymbol(targetSymbol), /*enclosingDeclaration*/ undefined, 64 /* UseFullyQualifiedType */));
                         }
                         enumRelation.set(id, false);
                         return false;
@@ -31164,78 +38452,91 @@ var ts;
         function isSimpleTypeRelatedTo(source, target, relation, errorReporter) {
             var s = source.flags;
             var t = target.flags;
-            if (t & 3 || s & 32768 || source === wildcardType)
+            if (t & 3 /* AnyOrUnknown */ || s & 32768 /* Never */ || source === wildcardType)
                 return true;
-            if (t & 32768)
+            if (t & 32768 /* Never */)
                 return false;
-            if (s & 68 && t & 4)
+            if (s & 68 /* StringLike */ && t & 4 /* String */)
                 return true;
-            if (s & 64 && s & 512 &&
-                t & 64 && !(t & 512) &&
+            if (s & 64 /* StringLiteral */ && s & 512 /* EnumLiteral */ &&
+                t & 64 /* StringLiteral */ && !(t & 512 /* EnumLiteral */) &&
                 source.value === target.value)
                 return true;
-            if (s & 168 && t & 8)
+            if (s & 168 /* NumberLike */ && t & 8 /* Number */)
                 return true;
-            if (s & 128 && s & 512 &&
-                t & 128 && !(t & 512) &&
+            if (s & 128 /* NumberLiteral */ && s & 512 /* EnumLiteral */ &&
+                t & 128 /* NumberLiteral */ && !(t & 512 /* EnumLiteral */) &&
                 source.value === target.value)
                 return true;
-            if (s & 272 && t & 16)
+            if (s & 272 /* BooleanLike */ && t & 16 /* Boolean */)
                 return true;
-            if (s & 3072 && t & 1024)
+            if (s & 3072 /* ESSymbolLike */ && t & 1024 /* ESSymbol */)
                 return true;
-            if (s & 32 && t & 32 && isEnumTypeRelatedTo(source.symbol, target.symbol, errorReporter))
+            if (s & 32 /* Enum */ && t & 32 /* Enum */ && isEnumTypeRelatedTo(source.symbol, target.symbol, errorReporter))
                 return true;
-            if (s & 512 && t & 512) {
-                if (s & 262144 && t & 262144 && isEnumTypeRelatedTo(source.symbol, target.symbol, errorReporter))
+            if (s & 512 /* EnumLiteral */ && t & 512 /* EnumLiteral */) {
+                if (s & 262144 /* Union */ && t & 262144 /* Union */ && isEnumTypeRelatedTo(source.symbol, target.symbol, errorReporter))
                     return true;
-                if (s & 448 && t & 448 &&
+                if (s & 448 /* Literal */ && t & 448 /* Literal */ &&
                     source.value === target.value &&
                     isEnumTypeRelatedTo(getParentOfSymbol(source.symbol), getParentOfSymbol(target.symbol), errorReporter))
                     return true;
             }
-            if (s & 8192 && (!strictNullChecks || t & (8192 | 4096)))
+            if (s & 8192 /* Undefined */ && (!strictNullChecks || t & (8192 /* Undefined */ | 4096 /* Void */)))
                 return true;
-            if (s & 16384 && (!strictNullChecks || t & 16384))
+            if (s & 16384 /* Null */ && (!strictNullChecks || t & 16384 /* Null */))
                 return true;
-            if (s & 131072 && t & 16777216)
+            if (s & 131072 /* Object */ && t & 16777216 /* NonPrimitive */)
                 return true;
-            if (s & 2048 || t & 2048)
+            if (s & 2048 /* UniqueESSymbol */ || t & 2048 /* UniqueESSymbol */)
                 return false;
             if (relation === assignableRelation || relation === definitelyAssignableRelation || relation === comparableRelation) {
-                if (s & 1)
+                if (s & 1 /* Any */)
                     return true;
-                if (s & (8 | 128) && !(s & 512) && (t & 32 || t & 128 && t & 512))
+                // Type number or any numeric literal type is assignable to any numeric enum type or any
+                // numeric enum literal type. This rule exists for backwards compatibility reasons because
+                // bit-flag enum types sometimes look like literal enum types with numeric literal values.
+                if (s & (8 /* Number */ | 128 /* NumberLiteral */) && !(s & 512 /* EnumLiteral */) && (t & 32 /* Enum */ || t & 128 /* NumberLiteral */ && t & 512 /* EnumLiteral */))
                     return true;
             }
             return false;
         }
         function isTypeRelatedTo(source, target, relation) {
-            if (source.flags & 192 && source.flags & 33554432) {
+            if (source.flags & 192 /* StringOrNumberLiteral */ && source.flags & 33554432 /* FreshLiteral */) {
                 source = source.regularType;
             }
-            if (target.flags & 192 && target.flags & 33554432) {
+            if (target.flags & 192 /* StringOrNumberLiteral */ && target.flags & 33554432 /* FreshLiteral */) {
                 target = target.regularType;
             }
             if (source === target ||
-                relation === comparableRelation && !(target.flags & 32768) && isSimpleTypeRelatedTo(target, source, relation) ||
+                relation === comparableRelation && !(target.flags & 32768 /* Never */) && isSimpleTypeRelatedTo(target, source, relation) ||
                 relation !== identityRelation && isSimpleTypeRelatedTo(source, target, relation)) {
                 return true;
             }
-            if (source.flags & 131072 && target.flags & 131072) {
+            if (source.flags & 131072 /* Object */ && target.flags & 131072 /* Object */) {
                 var related = relation.get(getRelationKey(source, target, relation));
                 if (related !== undefined) {
-                    return related === 1;
+                    return related === 1 /* Succeeded */;
                 }
             }
-            if (source.flags & 16711680 || target.flags & 16711680) {
-                return checkTypeRelatedTo(source, target, relation, undefined);
+            if (source.flags & 16711680 /* StructuredOrInstantiable */ || target.flags & 16711680 /* StructuredOrInstantiable */) {
+                return checkTypeRelatedTo(source, target, relation, /*errorNode*/ undefined);
             }
             return false;
         }
         function isIgnoredJsxProperty(source, sourceProp, targetMemberType) {
-            return ts.getObjectFlags(source) & 4096 && !(isUnhyphenatedJsxName(sourceProp.escapedName) || targetMemberType);
+            return ts.getObjectFlags(source) & 4096 /* JsxAttributes */ && !(isUnhyphenatedJsxName(sourceProp.escapedName) || targetMemberType);
         }
+        /**
+         * Checks if 'source' is related to 'target' (e.g.: is a assignable to).
+         * @param source The left-hand-side of the relation.
+         * @param target The right-hand-side of the relation.
+         * @param relation The relation considered. One of 'identityRelation', 'subtypeRelation', 'assignableRelation', or 'comparableRelation'.
+         * Used as both to determine which checks are performed and as a cache of previously computed results.
+         * @param errorNode The suggested node upon which all errors will be reported, if defined. This may or may not be the actual node used.
+         * @param headMessage If the error chain should be prepended by a head message, then headMessage will be used.
+         * @param containingMessageChain A chain of errors to prepend any new errors found.
+         */
         function checkTypeRelatedTo(source, target, relation, errorNode, headMessage, containingMessageChain) {
             var errorInfo;
             var maybeKeys;
@@ -31243,11 +38544,11 @@ var ts;
             var targetStack;
             var maybeCount = 0;
             var depth = 0;
-            var expandingFlags = 0;
+            var expandingFlags = 0 /* None */;
             var overflow = false;
             var isIntersectionConstituent = false;
             ts.Debug.assert(relation !== identityRelation || !errorNode, "no error reporting in identity checking");
-            var result = isRelatedTo(source, target, !!errorNode, headMessage);
+            var result = isRelatedTo(source, target, /*reportErrors*/ !!errorNode, headMessage);
             if (overflow) {
                 error(errorNode, ts.Diagnostics.Excessive_stack_depth_comparing_types_0_and_1, typeToString(source), typeToString(target));
             }
@@ -31258,18 +38559,20 @@ var ts;
                         errorInfo = ts.concatenateDiagnosticMessageChains(chain_1, errorInfo);
                     }
                 }
-                diagnostics.add(ts.createDiagnosticForNodeFromMessageChain(errorNode, errorInfo));
+                diagnostics.add(ts.createDiagnosticForNodeFromMessageChain(errorNode, errorInfo)); // TODO: GH#18217
             }
+            // Check if we should issue an extra diagnostic to produce a quickfix for a slightly incorrect import statement
             if (headMessage && errorNode && !result && source.symbol) {
                 var links = getSymbolLinks(source.symbol);
                 if (links.originatingImport && !ts.isImportCall(links.originatingImport)) {
-                    var helpfulRetry = checkTypeRelatedTo(getTypeOfSymbol(links.target), target, relation, undefined);
+                    var helpfulRetry = checkTypeRelatedTo(getTypeOfSymbol(links.target), target, relation, /*errorNode*/ undefined);
                     if (helpfulRetry) {
+                        // Likely an incorrect import. Issue a helpful diagnostic to produce a quickfix to change the import
                         diagnostics.add(ts.createDiagnosticForNode(links.originatingImport, ts.Diagnostics.A_namespace_style_import_cannot_be_called_or_constructed_and_will_cause_a_failure_at_runtime));
                     }
                 }
             }
-            return result !== 0;
+            return result !== 0 /* False */;
             function reportError(message, arg0, arg1, arg2) {
                 ts.Debug.assert(!!errorNode);
                 errorInfo = ts.chainDiagnosticMessages(errorInfo, message, arg0, arg1, arg2);
@@ -31278,8 +38581,8 @@ var ts;
                 var sourceType = typeToString(source);
                 var targetType = typeToString(target);
                 if (sourceType === targetType) {
-                    sourceType = typeToString(source, undefined, 64);
-                    targetType = typeToString(target, undefined, 64);
+                    sourceType = typeToString(source, /*enclosingDeclaration*/ undefined, 64 /* UseFullyQualifiedType */);
+                    targetType = typeToString(target, /*enclosingDeclaration*/ undefined, 64 /* UseFullyQualifiedType */);
                 }
                 if (!message) {
                     if (relation === comparableRelation) {
@@ -31300,18 +38603,20 @@ var ts;
                 if ((globalStringType === source && stringType === target) ||
                     (globalNumberType === source && numberType === target) ||
                     (globalBooleanType === source && booleanType === target) ||
-                    (getGlobalESSymbolType(false) === source && esSymbolType === target)) {
+                    (getGlobalESSymbolType(/*reportErrors*/ false) === source && esSymbolType === target)) {
                     reportError(ts.Diagnostics._0_is_a_primitive_but_1_is_a_wrapper_object_Prefer_using_0_when_possible, targetType, sourceType);
                 }
             }
             function isUnionOrIntersectionTypeWithoutNullableConstituents(type) {
-                if (!(type.flags & 786432)) {
+                if (!(type.flags & 786432 /* UnionOrIntersection */)) {
                     return false;
                 }
+                // at this point we know that this is union or intersection type possibly with nullable constituents.
+                // check if we still will have compound type if we ignore nullable components.
                 var seenNonNullable = false;
                 for (var _i = 0, _a = type.types; _i < _a.length; _i++) {
                     var t = _a[_i];
-                    if (t.flags & 24576) {
+                    if (t.flags & 24576 /* Nullable */) {
                         continue;
                     }
                     if (seenNonNullable) {
@@ -31321,95 +38626,131 @@ var ts;
                 }
                 return false;
             }
+            /**
+             * Compare two types and return
+             * * Ternary.True if they are related with no assumptions,
+             * * Ternary.Maybe if they are related with assumptions of other relationships, or
+             * * Ternary.False if they are not related.
+             */
             function isRelatedTo(source, target, reportErrors, headMessage) {
                 if (reportErrors === void 0) { reportErrors = false; }
-                if (source.flags & 192 && source.flags & 33554432) {
+                if (source.flags & 192 /* StringOrNumberLiteral */ && source.flags & 33554432 /* FreshLiteral */) {
                     source = source.regularType;
                 }
-                if (target.flags & 192 && target.flags & 33554432) {
+                if (target.flags & 192 /* StringOrNumberLiteral */ && target.flags & 33554432 /* FreshLiteral */) {
                     target = target.regularType;
                 }
-                if (source.flags & 8388608) {
+                if (source.flags & 8388608 /* Substitution */) {
                     source = relation === definitelyAssignableRelation ? source.typeVariable : source.substitute;
                 }
-                if (target.flags & 8388608) {
+                if (target.flags & 8388608 /* Substitution */) {
                     target = target.typeVariable;
                 }
-                if (source.flags & 2097152) {
+                if (source.flags & 2097152 /* IndexedAccess */) {
                     source = getSimplifiedType(source);
                 }
-                if (target.flags & 2097152) {
+                if (target.flags & 2097152 /* IndexedAccess */) {
                     target = getSimplifiedType(target);
                 }
+                // both types are the same - covers 'they are the same primitive type or both are Any' or the same type parameter cases
                 if (source === target)
-                    return -1;
+                    return -1 /* True */;
                 if (relation === identityRelation) {
                     return isIdenticalTo(source, target);
                 }
-                if (relation === comparableRelation && !(target.flags & 32768) && isSimpleTypeRelatedTo(target, source, relation) ||
+                if (relation === comparableRelation && !(target.flags & 32768 /* Never */) && isSimpleTypeRelatedTo(target, source, relation) ||
                     isSimpleTypeRelatedTo(source, target, relation, reportErrors ? reportError : undefined))
-                    return -1;
-                if (isObjectLiteralType(source) && source.flags & 33554432) {
-                    var discriminantType = target.flags & 262144 ? findMatchingDiscriminantType(source, target) : undefined;
+                    return -1 /* True */;
+                if (isObjectLiteralType(source) && source.flags & 33554432 /* FreshLiteral */) {
+                    var discriminantType = target.flags & 262144 /* Union */ ? findMatchingDiscriminantType(source, target) : undefined;
                     if (hasExcessProperties(source, target, discriminantType, reportErrors)) {
                         if (reportErrors) {
                             reportRelationError(headMessage, source, target);
                         }
-                        return 0;
+                        return 0 /* False */;
                     }
+                    // Above we check for excess properties with respect to the entire target type. When union
+                    // and intersection types are further deconstructed on the target side, we don't want to
+                    // make the check again (as it might fail for a partial target type). Therefore we obtain
+                    // the regular source type and proceed with that.
                     if (isUnionOrIntersectionTypeWithoutNullableConstituents(target) && !discriminantType) {
                         source = getRegularTypeOfObjectLiteral(source);
                     }
                 }
                 if (relation !== comparableRelation &&
-                    !(source.flags & 786432) &&
-                    !(target.flags & 262144) &&
+                    !(source.flags & 786432 /* UnionOrIntersection */) &&
+                    !(target.flags & 262144 /* Union */) &&
                     !isIntersectionConstituent &&
                     source !== globalObjectType &&
                     (getPropertiesOfType(source).length > 0 || typeHasCallOrConstructSignatures(source)) &&
                     isWeakType(target) &&
                     !hasCommonProperties(source, target)) {
                     if (reportErrors) {
-                        var calls = getSignaturesOfType(source, 0);
-                        var constructs = getSignaturesOfType(source, 1);
-                        if (calls.length > 0 && isRelatedTo(getReturnTypeOfSignature(calls[0]), target, false) ||
-                            constructs.length > 0 && isRelatedTo(getReturnTypeOfSignature(constructs[0]), target, false)) {
+                        var calls = getSignaturesOfType(source, 0 /* Call */);
+                        var constructs = getSignaturesOfType(source, 1 /* Construct */);
+                        if (calls.length > 0 && isRelatedTo(getReturnTypeOfSignature(calls[0]), target, /*reportErrors*/ false) ||
+                            constructs.length > 0 && isRelatedTo(getReturnTypeOfSignature(constructs[0]), target, /*reportErrors*/ false)) {
                             reportError(ts.Diagnostics.Value_of_type_0_has_no_properties_in_common_with_type_1_Did_you_mean_to_call_it, typeToString(source), typeToString(target));
                         }
                         else {
                             reportError(ts.Diagnostics.Type_0_has_no_properties_in_common_with_type_1, typeToString(source), typeToString(target));
                         }
                     }
-                    return 0;
+                    return 0 /* False */;
                 }
-                var result = 0;
+                var result = 0 /* False */;
                 var saveErrorInfo = errorInfo;
                 var saveIsIntersectionConstituent = isIntersectionConstituent;
                 isIntersectionConstituent = false;
-                if (source.flags & 262144) {
+                // Note that these checks are specifically ordered to produce correct results. In particular,
+                // we need to deconstruct unions before intersections (because unions are always at the top),
+                // and we need to handle "each" relations before "some" relations for the same kind of type.
+                if (source.flags & 262144 /* Union */) {
                     result = relation === comparableRelation ?
-                        someTypeRelatedToType(source, target, reportErrors && !(source.flags & 32764)) :
-                        eachTypeRelatedToType(source, target, reportErrors && !(source.flags & 32764));
+                        someTypeRelatedToType(source, target, reportErrors && !(source.flags & 32764 /* Primitive */)) :
+                        eachTypeRelatedToType(source, target, reportErrors && !(source.flags & 32764 /* Primitive */));
                 }
                 else {
-                    if (target.flags & 262144) {
-                        result = typeRelatedToSomeType(source, target, reportErrors && !(source.flags & 32764) && !(target.flags & 32764));
+                    if (target.flags & 262144 /* Union */) {
+                        result = typeRelatedToSomeType(source, target, reportErrors && !(source.flags & 32764 /* Primitive */) && !(target.flags & 32764 /* Primitive */));
                     }
-                    else if (target.flags & 524288) {
+                    else if (target.flags & 524288 /* Intersection */) {
                         isIntersectionConstituent = true;
                         result = typeRelatedToEachType(source, target, reportErrors);
                     }
-                    else if (source.flags & 524288) {
-                        result = someTypeRelatedToType(source, target, false);
+                    else if (source.flags & 524288 /* Intersection */) {
+                        // Check to see if any constituents of the intersection are immediately related to the target.
+                        //
+                        // Don't report errors though. Checking whether a constituent is related to the source is not actually
+                        // useful and leads to some confusing error messages. Instead it is better to let the below checks
+                        // take care of this, or to not elaborate at all. For instance,
+                        //
+                        //    - For an object type (such as 'C = A & B'), users are usually more interested in structural errors.
+                        //
+                        //    - For a union type (such as '(A | B) = (C & D)'), it's better to hold onto the whole intersection
+                        //          than to report that 'D' is not assignable to 'A' or 'B'.
+                        //
+                        //    - For a primitive type or type parameter (such as 'number = A & B') there is no point in
+                        //          breaking the intersection apart.
+                        result = someTypeRelatedToType(source, target, /*reportErrors*/ false);
                     }
-                    if (!result && (source.flags & 16711680 || target.flags & 16711680)) {
+                    if (!result && (source.flags & 16711680 /* StructuredOrInstantiable */ || target.flags & 16711680 /* StructuredOrInstantiable */)) {
                         if (result = recursiveTypeRelatedTo(source, target, reportErrors)) {
                             errorInfo = saveErrorInfo;
                         }
                     }
                 }
-                if (!result && source.flags & 524288) {
-                    var constraint = getUnionConstraintOfIntersection(source, !!(target.flags & 262144));
+                if (!result && source.flags & 524288 /* Intersection */) {
+                    // The combined constraint of an intersection type is the intersection of the constraints of
+                    // the constituents. When an intersection type contains instantiable types with union type
+                    // constraints, there are situations where we need to examine the combined constraint. One is
+                    // when the target is a union type. Another is when the intersection contains types belonging
+                    // to one of the disjoint domains. For example, given type variables T and U, each with the
+                    // constraint 'string | number', the combined constraint of 'T & U' is 'string | number' and
+                    // we need to check this constraint against a union on the target side. Also, given a type
+                    // variable V constrained to 'string | number', 'V & number' has a combined constraint of
+                    // 'string & number | number & number' which reduces to just 'number'.
+                    var constraint = getUnionConstraintOfIntersection(source, !!(target.flags & 262144 /* Union */));
                     if (constraint) {
                         if (result = isRelatedTo(constraint, target, reportErrors)) {
                             errorInfo = saveErrorInfo;
@@ -31418,18 +38759,19 @@ var ts;
                 }
                 isIntersectionConstituent = saveIsIntersectionConstituent;
                 if (!result && reportErrors) {
-                    if (source.flags & 131072 && target.flags & 32764) {
+                    if (source.flags & 131072 /* Object */ && target.flags & 32764 /* Primitive */) {
                         tryElaborateErrorsForPrimitivesAndObjects(source, target);
                     }
-                    else if (source.symbol && source.flags & 131072 && globalObjectType === source) {
+                    else if (source.symbol && source.flags & 131072 /* Object */ && globalObjectType === source) {
                         reportError(ts.Diagnostics.The_Object_type_is_assignable_to_very_few_other_types_Did_you_mean_to_use_the_any_type_instead);
                     }
-                    else if (ts.getObjectFlags(source) & 4096 && target.flags & 524288) {
+                    else if (ts.getObjectFlags(source) & 4096 /* JsxAttributes */ && target.flags & 524288 /* Intersection */) {
                         var targetTypes = target.types;
                         var intrinsicAttributes = getJsxType(JsxNames.IntrinsicAttributes, errorNode);
                         var intrinsicClassAttributes = getJsxType(JsxNames.IntrinsicClassAttributes, errorNode);
                         if (intrinsicAttributes !== errorType && intrinsicClassAttributes !== errorType &&
                             (ts.contains(targetTypes, intrinsicAttributes) || ts.contains(targetTypes, intrinsicClassAttributes))) {
+                            // do not report top error
                             return result;
                         }
                     }
@@ -31440,32 +38782,32 @@ var ts;
             function isIdenticalTo(source, target) {
                 var result;
                 var flags = source.flags & target.flags;
-                if (flags & 131072) {
-                    return recursiveTypeRelatedTo(source, target, false);
+                if (flags & 131072 /* Object */) {
+                    return recursiveTypeRelatedTo(source, target, /*reportErrors*/ false);
                 }
-                if (flags & (262144 | 524288)) {
+                if (flags & (262144 /* Union */ | 524288 /* Intersection */)) {
                     if (result = eachTypeRelatedToSomeType(source, target)) {
                         if (result &= eachTypeRelatedToSomeType(target, source)) {
                             return result;
                         }
                     }
                 }
-                if (flags & 1048576) {
-                    return isRelatedTo(source.type, target.type, false);
+                if (flags & 1048576 /* Index */) {
+                    return isRelatedTo(source.type, target.type, /*reportErrors*/ false);
                 }
-                if (flags & 2097152) {
-                    if (result = isRelatedTo(source.objectType, target.objectType, false)) {
-                        if (result &= isRelatedTo(source.indexType, target.indexType, false)) {
+                if (flags & 2097152 /* IndexedAccess */) {
+                    if (result = isRelatedTo(source.objectType, target.objectType, /*reportErrors*/ false)) {
+                        if (result &= isRelatedTo(source.indexType, target.indexType, /*reportErrors*/ false)) {
                             return result;
                         }
                     }
                 }
-                if (flags & 4194304) {
+                if (flags & 4194304 /* Conditional */) {
                     if (source.root.isDistributive === target.root.isDistributive) {
-                        if (result = isRelatedTo(source.checkType, target.checkType, false)) {
-                            if (result &= isRelatedTo(source.extendsType, target.extendsType, false)) {
-                                if (result &= isRelatedTo(getTrueTypeFromConditionalType(source), getTrueTypeFromConditionalType(target), false)) {
-                                    if (result &= isRelatedTo(getFalseTypeFromConditionalType(source), getFalseTypeFromConditionalType(target), false)) {
+                        if (result = isRelatedTo(source.checkType, target.checkType, /*reportErrors*/ false)) {
+                            if (result &= isRelatedTo(source.extendsType, target.extendsType, /*reportErrors*/ false)) {
+                                if (result &= isRelatedTo(getTrueTypeFromConditionalType(source), getTrueTypeFromConditionalType(target), /*reportErrors*/ false)) {
+                                    if (result &= isRelatedTo(getFalseTypeFromConditionalType(source), getFalseTypeFromConditionalType(target), /*reportErrors*/ false)) {
                                         return result;
                                     }
                                 }
@@ -31473,30 +38815,37 @@ var ts;
                         }
                     }
                 }
-                if (flags & 8388608) {
-                    return isRelatedTo(source.substitute, target.substitute, false);
+                if (flags & 8388608 /* Substitution */) {
+                    return isRelatedTo(source.substitute, target.substitute, /*reportErrors*/ false);
                 }
-                return 0;
+                return 0 /* False */;
             }
             function hasExcessProperties(source, target, discriminant, reportErrors) {
-                if (maybeTypeOfKind(target, 131072) && !(ts.getObjectFlags(target) & 512)) {
-                    var isComparingJsxAttributes = !!(ts.getObjectFlags(source) & 4096);
+                if (maybeTypeOfKind(target, 131072 /* Object */) && !(ts.getObjectFlags(target) & 512 /* ObjectLiteralPatternWithComputedProperties */)) {
+                    var isComparingJsxAttributes = !!(ts.getObjectFlags(source) & 4096 /* JsxAttributes */);
                     if ((relation === assignableRelation || relation === definitelyAssignableRelation || relation === comparableRelation) &&
                         (isTypeSubsetOf(globalObjectType, target) || (!isComparingJsxAttributes && isEmptyObjectType(target)))) {
                         return false;
                     }
                     if (discriminant) {
-                        return hasExcessProperties(source, discriminant, undefined, reportErrors);
+                        // check excess properties against discriminant type only, not the entire union
+                        return hasExcessProperties(source, discriminant, /*discriminant*/ undefined, reportErrors);
                     }
-                    var _loop_6 = function (prop) {
+                    var _loop_4 = function (prop) {
                         if (!isKnownProperty(target, prop.escapedName, isComparingJsxAttributes)) {
                             if (reportErrors) {
+                                // We know *exactly* where things went wrong when comparing the types.
+                                // Use this property as the error node as this will be more helpful in
+                                // reasoning about what went wrong.
                                 if (!errorNode)
                                     return { value: ts.Debug.fail() };
                                 if (ts.isJsxAttributes(errorNode) || ts.isJsxOpeningLikeElement(errorNode)) {
+                                    // JsxAttributes has an object-literal flag and undergo same type-assignablity check as normal object-literal.
+                                    // However, using an object-literal error message will be very confusing to the users so we give different a message.
                                     reportError(ts.Diagnostics.Property_0_does_not_exist_on_type_1, symbolToString(prop), typeToString(target));
                                 }
                                 else {
+                                    // use the property's value declaration if the property is assigned inside the literal itself
                                     var objectLiteralDeclaration_1 = source.symbol && ts.firstOrUndefined(source.symbol.declarations);
                                     var suggestion = void 0;
                                     if (prop.valueDeclaration && ts.findAncestor(prop.valueDeclaration, function (d) { return d === objectLiteralDeclaration_1; })) {
@@ -31521,7 +38870,7 @@ var ts;
                     };
                     for (var _i = 0, _a = getPropertiesOfObjectType(source); _i < _a.length; _i++) {
                         var prop = _a[_i];
-                        var state_3 = _loop_6(prop);
+                        var state_3 = _loop_4(prop);
                         if (typeof state_3 === "object")
                             return state_3.value;
                     }
@@ -31529,13 +38878,13 @@ var ts;
                 return false;
             }
             function eachTypeRelatedToSomeType(source, target) {
-                var result = -1;
+                var result = -1 /* True */;
                 var sourceTypes = source.types;
                 for (var _i = 0, sourceTypes_1 = sourceTypes; _i < sourceTypes_1.length; _i++) {
                     var sourceType = sourceTypes_1[_i];
-                    var related = typeRelatedToSomeType(sourceType, target, false);
+                    var related = typeRelatedToSomeType(sourceType, target, /*reportErrors*/ false);
                     if (!related) {
-                        return 0;
+                        return 0 /* False */;
                     }
                     result &= related;
                 }
@@ -31543,22 +38892,23 @@ var ts;
             }
             function typeRelatedToSomeType(source, target, reportErrors) {
                 var targetTypes = target.types;
-                if (target.flags & 262144 && containsType(targetTypes, source)) {
-                    return -1;
+                if (target.flags & 262144 /* Union */ && containsType(targetTypes, source)) {
+                    return -1 /* True */;
                 }
                 for (var _i = 0, targetTypes_1 = targetTypes; _i < targetTypes_1.length; _i++) {
                     var type = targetTypes_1[_i];
-                    var related = isRelatedTo(source, type, false);
+                    var related = isRelatedTo(source, type, /*reportErrors*/ false);
                     if (related) {
                         return related;
                     }
                 }
                 if (reportErrors) {
                     var discriminantType = findMatchingDiscriminantType(source, target);
-                    isRelatedTo(source, discriminantType || targetTypes[targetTypes.length - 1], true);
+                    isRelatedTo(source, discriminantType || targetTypes[targetTypes.length - 1], /*reportErrors*/ true);
                 }
-                return 0;
+                return 0 /* False */;
             }
+            // Keep this up-to-date with the same logic within `getApparentTypeOfContextualType`, since they should behave similarly
             function findMatchingDiscriminantType(source, target) {
                 var match;
                 var sourceProperties = getPropertiesOfObjectType(source);
@@ -31573,7 +38923,7 @@ var ts;
                                 var targetType = getTypeOfPropertyOfType(type, sourceProperty.escapedName);
                                 if (targetType && isRelatedTo(sourceType, targetType)) {
                                     if (type === match)
-                                        continue;
+                                        continue; // Finding multiple fields which discriminate to the same type is fine
                                     if (match) {
                                         return undefined;
                                     }
@@ -31586,13 +38936,13 @@ var ts;
                 return match;
             }
             function typeRelatedToEachType(source, target, reportErrors) {
-                var result = -1;
+                var result = -1 /* True */;
                 var targetTypes = target.types;
                 for (var _i = 0, targetTypes_2 = targetTypes; _i < targetTypes_2.length; _i++) {
                     var targetType = targetTypes_2[_i];
                     var related = isRelatedTo(source, targetType, reportErrors);
                     if (!related) {
-                        return 0;
+                        return 0 /* False */;
                     }
                     result &= related;
                 }
@@ -31600,8 +38950,8 @@ var ts;
             }
             function someTypeRelatedToType(source, target, reportErrors) {
                 var sourceTypes = source.types;
-                if (source.flags & 262144 && containsType(sourceTypes, target)) {
-                    return -1;
+                if (source.flags & 262144 /* Union */ && containsType(sourceTypes, target)) {
+                    return -1 /* True */;
                 }
                 var len = sourceTypes.length;
                 for (var i = 0; i < len; i++) {
@@ -31610,16 +38960,16 @@ var ts;
                         return related;
                     }
                 }
-                return 0;
+                return 0 /* False */;
             }
             function eachTypeRelatedToType(source, target, reportErrors) {
-                var result = -1;
+                var result = -1 /* True */;
                 var sourceTypes = source.types;
                 for (var _i = 0, sourceTypes_2 = sourceTypes; _i < sourceTypes_2.length; _i++) {
                     var sourceType = sourceTypes_2[_i];
                     var related = isRelatedTo(sourceType, target, reportErrors);
                     if (!related) {
-                        return 0;
+                        return 0 /* False */;
                     }
                     result &= related;
                 }
@@ -31629,54 +38979,72 @@ var ts;
                 var sources = source.typeArguments || ts.emptyArray;
                 var targets = target.typeArguments || ts.emptyArray;
                 if (sources.length !== targets.length && relation === identityRelation) {
-                    return 0;
+                    return 0 /* False */;
                 }
                 var length = sources.length <= targets.length ? sources.length : targets.length;
-                var result = -1;
+                var result = -1 /* True */;
                 for (var i = 0; i < length; i++) {
-                    var variance = i < variances.length ? variances[i] : 1;
-                    if (variance !== 4) {
+                    // When variance information isn't available we default to covariance. This happens
+                    // in the process of computing variance information for recursive types and when
+                    // comparing 'this' type arguments.
+                    var variance = i < variances.length ? variances[i] : 1 /* Covariant */;
+                    // We ignore arguments for independent type parameters (because they're never witnessed).
+                    if (variance !== 4 /* Independent */) {
                         var s = sources[i];
                         var t = targets[i];
-                        var related = -1;
-                        if (variance === 1) {
+                        var related = -1 /* True */;
+                        if (variance === 1 /* Covariant */) {
                             related = isRelatedTo(s, t, reportErrors);
                         }
-                        else if (variance === 2) {
+                        else if (variance === 2 /* Contravariant */) {
                             related = isRelatedTo(t, s, reportErrors);
                         }
-                        else if (variance === 3) {
-                            related = isRelatedTo(t, s, false);
+                        else if (variance === 3 /* Bivariant */) {
+                            // In the bivariant case we first compare contravariantly without reporting
+                            // errors. Then, if that doesn't succeed, we compare covariantly with error
+                            // reporting. Thus, error elaboration will be based on the the covariant check,
+                            // which is generally easier to reason about.
+                            related = isRelatedTo(t, s, /*reportErrors*/ false);
                             if (!related) {
                                 related = isRelatedTo(s, t, reportErrors);
                             }
                         }
                         else {
+                            // In the invariant case we first compare covariantly, and only when that
+                            // succeeds do we proceed to compare contravariantly. Thus, error elaboration
+                            // will typically be based on the covariant check.
                             related = isRelatedTo(s, t, reportErrors);
                             if (related) {
                                 related &= isRelatedTo(t, s, reportErrors);
                             }
                         }
                         if (!related) {
-                            return 0;
+                            return 0 /* False */;
                         }
                         result &= related;
                     }
                 }
                 return result;
             }
+            // Determine if possibly recursive types are related. First, check if the result is already available in the global cache.
+            // Second, check if we have already started a comparison of the given two types in which case we assume the result to be true.
+            // Third, check if both types are part of deeply nested chains of generic type instantiations and if so assume the types are
+            // equal and infinitely expanding. Fourth, if we have reached a depth of 100 nested comparisons, assume we have runaway recursion
+            // and issue an error. Otherwise, actually compare the structure of the two types.
             function recursiveTypeRelatedTo(source, target, reportErrors) {
                 if (overflow) {
-                    return 0;
+                    return 0 /* False */;
                 }
                 var id = getRelationKey(source, target, relation);
                 var related = relation.get(id);
                 if (related !== undefined) {
-                    if (reportErrors && related === 2) {
-                        relation.set(id, 3);
+                    if (reportErrors && related === 2 /* Failed */) {
+                        // We are elaborating errors and the cached result is an unreported failure. Record the result as a reported
+                        // failure and continue computing the relation such that errors get reported.
+                        relation.set(id, 3 /* FailedAndReported */);
                     }
                     else {
-                        return related === 1 ? -1 : 0;
+                        return related === 1 /* Succeeded */ ? -1 /* True */ : 0 /* False */;
                     }
                 }
                 if (!maybeKeys) {
@@ -31686,13 +39054,14 @@ var ts;
                 }
                 else {
                     for (var i = 0; i < maybeCount; i++) {
+                        // If source and target are already being compared, consider them related with assumptions
                         if (id === maybeKeys[i]) {
-                            return 1;
+                            return 1 /* Maybe */;
                         }
                     }
                     if (depth === 100) {
                         overflow = true;
-                        return 0;
+                        return 0 /* False */;
                     }
                 }
                 var maybeStart = maybeCount;
@@ -31702,23 +39071,26 @@ var ts;
                 targetStack[depth] = target;
                 depth++;
                 var saveExpandingFlags = expandingFlags;
-                if (!(expandingFlags & 1) && isDeeplyNestedType(source, sourceStack, depth))
-                    expandingFlags |= 1;
-                if (!(expandingFlags & 2) && isDeeplyNestedType(target, targetStack, depth))
-                    expandingFlags |= 2;
-                var result = expandingFlags !== 3 ? structuredTypeRelatedTo(source, target, reportErrors) : 1;
+                if (!(expandingFlags & 1 /* Source */) && isDeeplyNestedType(source, sourceStack, depth))
+                    expandingFlags |= 1 /* Source */;
+                if (!(expandingFlags & 2 /* Target */) && isDeeplyNestedType(target, targetStack, depth))
+                    expandingFlags |= 2 /* Target */;
+                var result = expandingFlags !== 3 /* Both */ ? structuredTypeRelatedTo(source, target, reportErrors) : 1 /* Maybe */;
                 expandingFlags = saveExpandingFlags;
                 depth--;
                 if (result) {
-                    if (result === -1 || depth === 0) {
+                    if (result === -1 /* True */ || depth === 0) {
+                        // If result is definitely true, record all maybe keys as having succeeded
                         for (var i = maybeStart; i < maybeCount; i++) {
-                            relation.set(maybeKeys[i], 1);
+                            relation.set(maybeKeys[i], 1 /* Succeeded */);
                         }
                         maybeCount = maybeStart;
                     }
                 }
                 else {
-                    relation.set(id, reportErrors ? 3 : 2);
+                    // A false result goes straight into global cache (when something is false under
+                    // assumptions it will also be false without assumptions)
+                    relation.set(id, reportErrors ? 3 /* FailedAndReported */ : 2 /* Failed */);
                     maybeCount = maybeStart;
                 }
                 return result;
@@ -31730,9 +39102,10 @@ var ts;
                 var result;
                 var originalErrorInfo;
                 var saveErrorInfo = errorInfo;
-                if (target.flags & 65536) {
-                    if (ts.getObjectFlags(source) & 32 && getConstraintTypeFromMappedType(source) === getIndexType(target)) {
-                        if (!(getMappedTypeModifiers(source) & 4)) {
+                if (target.flags & 65536 /* TypeParameter */) {
+                    // A source type { [P in keyof T]: X } is related to a target type T if X is related to T[P].
+                    if (ts.getObjectFlags(source) & 32 /* Mapped */ && getConstraintTypeFromMappedType(source) === getIndexType(target)) {
+                        if (!(getMappedTypeModifiers(source) & 4 /* IncludeOptional */)) {
                             var templateType = getTemplateTypeFromMappedType(source);
                             var indexedAccessType = getIndexedAccessType(target, getTypeParameterFromMappedType(source));
                             if (result = isRelatedTo(templateType, indexedAccessType, reportErrors)) {
@@ -31741,12 +39114,15 @@ var ts;
                         }
                     }
                 }
-                else if (target.flags & 1048576) {
-                    if (source.flags & 1048576) {
-                        if (result = isRelatedTo(target.type, source.type, false)) {
+                else if (target.flags & 1048576 /* Index */) {
+                    // A keyof S is related to a keyof T if T is related to S.
+                    if (source.flags & 1048576 /* Index */) {
+                        if (result = isRelatedTo(target.type, source.type, /*reportErrors*/ false)) {
                             return result;
                         }
                     }
+                    // A type S is assignable to keyof T if S is assignable to keyof C, where C is the
+                    // simplified form of T or, if T doesn't simplify, the constraint of T.
                     if (relation !== definitelyAssignableRelation) {
                         var simplified = getSimplifiedType(target.type);
                         var constraint = simplified !== target.type ? simplified : getConstraintOfType(target.type);
@@ -31757,7 +39133,9 @@ var ts;
                         }
                     }
                 }
-                else if (target.flags & 2097152) {
+                else if (target.flags & 2097152 /* IndexedAccess */) {
+                    // A type S is related to a type T[K] if S is related to C, where C is the
+                    // constraint of T[K]
                     var constraint = getConstraintForRelation(target);
                     if (constraint) {
                         if (result = isRelatedTo(source, constraint, reportErrors)) {
@@ -31767,13 +39145,15 @@ var ts;
                     }
                 }
                 else if (isGenericMappedType(target)) {
+                    // A source type T is related to a target type { [P in X]: T[P] }
                     var template = getTemplateTypeFromMappedType(target);
                     var modifiers = getMappedTypeModifiers(target);
-                    if (!(modifiers & 8)) {
-                        if (template.flags & 2097152 && template.objectType === source &&
+                    if (!(modifiers & 8 /* ExcludeOptional */)) {
+                        if (template.flags & 2097152 /* IndexedAccess */ && template.objectType === source &&
                             template.indexType === getTypeParameterFromMappedType(target)) {
-                            return -1;
+                            return -1 /* True */;
                         }
+                        // A source type T is related to a target type { [P in keyof T]: X } if T[P] is related to X.
                         if (!isGenericMappedType(source) && getConstraintTypeFromMappedType(target) === getIndexType(source)) {
                             var indexedAccessType = getIndexedAccessType(source, getTypeParameterFromMappedType(target));
                             var templateType = getTemplateTypeFromMappedType(target);
@@ -31784,8 +39164,9 @@ var ts;
                         }
                     }
                 }
-                if (source.flags & 2162688) {
-                    if (source.flags & 2097152 && target.flags & 2097152) {
+                if (source.flags & 2162688 /* TypeVariable */) {
+                    if (source.flags & 2097152 /* IndexedAccess */ && target.flags & 2097152 /* IndexedAccess */) {
+                        // A type S[K] is related to a type T[J] if S is related to T and K is related to J.
                         if (result = isRelatedTo(source.objectType, target.objectType, reportErrors)) {
                             result &= isRelatedTo(source.indexType, target.indexType, reportErrors);
                         }
@@ -31795,8 +39176,9 @@ var ts;
                         }
                     }
                     var constraint = getConstraintForRelation(source);
-                    if (!constraint || (source.flags & 65536 && constraint.flags & 3)) {
-                        if (result = isRelatedTo(emptyObjectType, extractTypesOfKind(target, ~16777216))) {
+                    if (!constraint || (source.flags & 65536 /* TypeParameter */ && constraint.flags & 3 /* AnyOrUnknown */)) {
+                        // A type variable with no constraint is not related to the non-primitive object type.
+                        if (result = isRelatedTo(emptyObjectType, extractTypesOfKind(target, ~16777216 /* NonPrimitive */))) {
                             errorInfo = saveErrorInfo;
                             return result;
                         }
@@ -31809,14 +39191,17 @@ var ts;
                         }
                     }
                 }
-                else if (source.flags & 1048576) {
+                else if (source.flags & 1048576 /* Index */) {
                     if (result = isRelatedTo(keyofConstraintType, target, reportErrors)) {
                         errorInfo = saveErrorInfo;
                         return result;
                     }
                 }
-                else if (source.flags & 4194304) {
-                    if (target.flags & 4194304) {
+                else if (source.flags & 4194304 /* Conditional */) {
+                    if (target.flags & 4194304 /* Conditional */) {
+                        // Two conditional types 'T1 extends U1 ? X1 : Y1' and 'T2 extends U2 ? X2 : Y2' are related if
+                        // one of T1 and T2 is related to the other, U1 and U2 are identical types, X1 is related to X2,
+                        // and Y1 is related to Y2.
                         if (isTypeIdenticalTo(source.extendsType, target.extendsType) &&
                             (isRelatedTo(source.checkType, target.checkType) || isRelatedTo(target.checkType, source.checkType))) {
                             if (result = isRelatedTo(getTrueTypeFromConditionalType(source), getTrueTypeFromConditionalType(target), reportErrors)) {
@@ -31846,42 +39231,68 @@ var ts;
                     }
                 }
                 else {
-                    if (ts.getObjectFlags(source) & 4 && ts.getObjectFlags(target) & 4 && source.target === target.target &&
-                        !(ts.getObjectFlags(source) & 8192 || ts.getObjectFlags(target) & 8192)) {
+                    if (ts.getObjectFlags(source) & 4 /* Reference */ && ts.getObjectFlags(target) & 4 /* Reference */ && source.target === target.target &&
+                        !(ts.getObjectFlags(source) & 8192 /* MarkerType */ || ts.getObjectFlags(target) & 8192 /* MarkerType */)) {
+                        // We have type references to the same generic type, and the type references are not marker
+                        // type references (which are intended by be compared structurally). Obtain the variance
+                        // information for the type parameters and relate the type arguments accordingly.
                         var variances = getVariances(source.target);
                         if (result = typeArgumentsRelatedTo(source, target, variances, reportErrors)) {
                             return result;
                         }
+                        // The type arguments did not relate appropriately, but it may be because we have no variance
+                        // information (in which case typeArgumentsRelatedTo defaulted to covariance for all type
+                        // arguments). It might also be the case that the target type has a 'void' type argument for
+                        // a covariant type parameter that is only used in return positions within the generic type
+                        // (in which case any type argument is permitted on the source side). In those cases we proceed
+                        // with a structural comparison. Otherwise, we know for certain the instantiations aren't
+                        // related and we can return here.
                         if (variances !== ts.emptyArray && !hasCovariantVoidArgument(target, variances)) {
-                            if (!(reportErrors && ts.some(variances, function (v) { return v === 0; }))) {
-                                return 0;
+                            // In some cases generic types that are covariant in regular type checking mode become
+                            // invariant in --strictFunctionTypes mode because one or more type parameters are used in
+                            // both co- and contravariant positions. In order to make it easier to diagnose *why* such
+                            // types are invariant, if any of the type parameters are invariant we reset the reported
+                            // errors and instead force a structural comparison (which will include elaborations that
+                            // reveal the reason).
+                            if (!(reportErrors && ts.some(variances, function (v) { return v === 0 /* Invariant */; }))) {
+                                return 0 /* False */;
                             }
+                            // We remember the original error information so we can restore it in case the structural
+                            // comparison unexpectedly succeeds. This can happen when the structural comparison result
+                            // is a Ternary.Maybe for example caused by the recursion depth limiter.
                             originalErrorInfo = errorInfo;
                             errorInfo = saveErrorInfo;
                         }
                     }
-                    var sourceIsPrimitive = !!(source.flags & 32764);
+                    // Even if relationship doesn't hold for unions, intersections, or generic type references,
+                    // it may hold in a structural comparison.
+                    var sourceIsPrimitive = !!(source.flags & 32764 /* Primitive */);
                     if (relation !== identityRelation) {
                         source = getApparentType(source);
                     }
-                    if (source.flags & (131072 | 524288) && target.flags & 131072) {
+                    // In a check of the form X = A & B, we will have previously checked if A relates to X or B relates
+                    // to X. Failing both of those we want to check if the aggregation of A and B's members structurally
+                    // relates to X. Thus, we include intersection types on the source side here.
+                    if (source.flags & (131072 /* Object */ | 524288 /* Intersection */) && target.flags & 131072 /* Object */) {
+                        // Report structural errors only if we haven't reported any errors yet
                         var reportStructuralErrors = reportErrors && errorInfo === saveErrorInfo && !sourceIsPrimitive;
+                        // An empty object type is related to any mapped type that includes a '?' modifier.
                         if (isPartialMappedType(target) && !isGenericMappedType(source) && isEmptyObjectType(source)) {
-                            result = -1;
+                            result = -1 /* True */;
                         }
                         else if (isGenericMappedType(target)) {
-                            result = isGenericMappedType(source) ? mappedTypeRelatedTo(source, target, reportStructuralErrors) : 0;
+                            result = isGenericMappedType(source) ? mappedTypeRelatedTo(source, target, reportStructuralErrors) : 0 /* False */;
                         }
                         else {
                             result = propertiesRelatedTo(source, target, reportStructuralErrors);
                             if (result) {
-                                result &= signaturesRelatedTo(source, target, 0, reportStructuralErrors);
+                                result &= signaturesRelatedTo(source, target, 0 /* Call */, reportStructuralErrors);
                                 if (result) {
-                                    result &= signaturesRelatedTo(source, target, 1, reportStructuralErrors);
+                                    result &= signaturesRelatedTo(source, target, 1 /* Construct */, reportStructuralErrors);
                                     if (result) {
-                                        result &= indexTypesRelatedTo(source, target, 0, sourceIsPrimitive, reportStructuralErrors);
+                                        result &= indexTypesRelatedTo(source, target, 0 /* String */, sourceIsPrimitive, reportStructuralErrors);
                                         if (result) {
-                                            result &= indexTypesRelatedTo(source, target, 1, sourceIsPrimitive, reportStructuralErrors);
+                                            result &= indexTypesRelatedTo(source, target, 1 /* Number */, sourceIsPrimitive, reportStructuralErrors);
                                         }
                                     }
                                 }
@@ -31896,19 +39307,22 @@ var ts;
                         }
                     }
                 }
-                return 0;
+                return 0 /* False */;
             }
+            // A type [P in S]: X is related to a type [Q in T]: Y if T is related to S and X' is
+            // related to Y, where X' is an instantiation of X in which P is replaced with Q. Notice
+            // that S and T are contra-variant whereas X and Y are co-variant.
             function mappedTypeRelatedTo(source, target, reportErrors) {
                 var modifiersRelated = relation === comparableRelation || (relation === identityRelation ? getMappedTypeModifiers(source) === getMappedTypeModifiers(target) :
                     getCombinedMappedTypeOptionality(source) <= getCombinedMappedTypeOptionality(target));
                 if (modifiersRelated) {
-                    var result_2;
-                    if (result_2 = isRelatedTo(getConstraintTypeFromMappedType(target), getConstraintTypeFromMappedType(source), reportErrors)) {
+                    var result_1;
+                    if (result_1 = isRelatedTo(getConstraintTypeFromMappedType(target), getConstraintTypeFromMappedType(source), reportErrors)) {
                         var mapper = createTypeMapper([getTypeParameterFromMappedType(source)], [getTypeParameterFromMappedType(target)]);
-                        return result_2 & isRelatedTo(instantiateType(getTemplateTypeFromMappedType(source), mapper), getTemplateTypeFromMappedType(target), reportErrors);
+                        return result_1 & isRelatedTo(instantiateType(getTemplateTypeFromMappedType(source), mapper), getTemplateTypeFromMappedType(target), reportErrors);
                     }
                 }
-                return 0;
+                return 0 /* False */;
             }
             function propertiesRelatedTo(source, target, reportErrors) {
                 if (relation === identityRelation) {
@@ -31920,7 +39334,7 @@ var ts;
                     if (reportErrors) {
                         reportError(ts.Diagnostics.Property_0_is_missing_in_type_1, symbolToString(unmatchedProperty), typeToString(source));
                     }
-                    return 0;
+                    return 0 /* False */;
                 }
                 if (isObjectLiteralType(target)) {
                     for (var _i = 0, _a = getPropertiesOfType(source); _i < _a.length; _i++) {
@@ -31931,16 +39345,16 @@ var ts;
                                 if (reportErrors) {
                                     reportError(ts.Diagnostics.Property_0_does_not_exist_on_type_1, symbolToString(sourceProp), typeToString(target));
                                 }
-                                return 0;
+                                return 0 /* False */;
                             }
                         }
                     }
                 }
-                var result = -1;
+                var result = -1 /* True */;
                 var properties = getPropertiesOfObjectType(target);
                 for (var _b = 0, properties_3 = properties; _b < properties_3.length; _b++) {
                     var targetProp = properties_3[_b];
-                    if (!(targetProp.flags & 4194304)) {
+                    if (!(targetProp.flags & 4194304 /* Prototype */)) {
                         var sourceProp = getPropertyOfType(source, targetProp.escapedName);
                         if (sourceProp && sourceProp !== targetProp) {
                             if (isIgnoredJsxProperty(source, sourceProp, getTypeOfSymbol(targetProp))) {
@@ -31948,74 +39362,86 @@ var ts;
                             }
                             var sourcePropFlags = ts.getDeclarationModifierFlagsFromSymbol(sourceProp);
                             var targetPropFlags = ts.getDeclarationModifierFlagsFromSymbol(targetProp);
-                            if (sourcePropFlags & 8 || targetPropFlags & 8) {
+                            if (sourcePropFlags & 8 /* Private */ || targetPropFlags & 8 /* Private */) {
                                 var hasDifferingDeclarations = sourceProp.valueDeclaration !== targetProp.valueDeclaration;
-                                if (ts.getCheckFlags(sourceProp) & 256 && hasDifferingDeclarations) {
+                                if (ts.getCheckFlags(sourceProp) & 256 /* ContainsPrivate */ && hasDifferingDeclarations) {
                                     if (reportErrors) {
                                         reportError(ts.Diagnostics.Property_0_has_conflicting_declarations_and_is_inaccessible_in_type_1, symbolToString(sourceProp), typeToString(source));
                                     }
-                                    return 0;
+                                    return 0 /* False */;
                                 }
                                 if (hasDifferingDeclarations) {
                                     if (reportErrors) {
-                                        if (sourcePropFlags & 8 && targetPropFlags & 8) {
+                                        if (sourcePropFlags & 8 /* Private */ && targetPropFlags & 8 /* Private */) {
                                             reportError(ts.Diagnostics.Types_have_separate_declarations_of_a_private_property_0, symbolToString(targetProp));
                                         }
                                         else {
-                                            reportError(ts.Diagnostics.Property_0_is_private_in_type_1_but_not_in_type_2, symbolToString(targetProp), typeToString(sourcePropFlags & 8 ? source : target), typeToString(sourcePropFlags & 8 ? target : source));
+                                            reportError(ts.Diagnostics.Property_0_is_private_in_type_1_but_not_in_type_2, symbolToString(targetProp), typeToString(sourcePropFlags & 8 /* Private */ ? source : target), typeToString(sourcePropFlags & 8 /* Private */ ? target : source));
                                         }
                                     }
-                                    return 0;
+                                    return 0 /* False */;
                                 }
                             }
-                            else if (targetPropFlags & 16) {
+                            else if (targetPropFlags & 16 /* Protected */) {
                                 if (!isValidOverrideOf(sourceProp, targetProp)) {
                                     if (reportErrors) {
                                         reportError(ts.Diagnostics.Property_0_is_protected_but_type_1_is_not_a_class_derived_from_2, symbolToString(targetProp), typeToString(getDeclaringClass(sourceProp) || source), typeToString(getDeclaringClass(targetProp) || target));
                                     }
-                                    return 0;
+                                    return 0 /* False */;
                                 }
                             }
-                            else if (sourcePropFlags & 16) {
+                            else if (sourcePropFlags & 16 /* Protected */) {
                                 if (reportErrors) {
                                     reportError(ts.Diagnostics.Property_0_is_protected_in_type_1_but_public_in_type_2, symbolToString(targetProp), typeToString(source), typeToString(target));
                                 }
-                                return 0;
+                                return 0 /* False */;
                             }
                             var related = isRelatedTo(getTypeOfSymbol(sourceProp), getTypeOfSymbol(targetProp), reportErrors);
                             if (!related) {
                                 if (reportErrors) {
                                     reportError(ts.Diagnostics.Types_of_property_0_are_incompatible, symbolToString(targetProp));
                                 }
-                                return 0;
+                                return 0 /* False */;
                             }
                             result &= related;
-                            if (relation !== comparableRelation && sourceProp.flags & 16777216 && !(targetProp.flags & 16777216)) {
+                            // When checking for comparability, be more lenient with optional properties.
+                            if (relation !== comparableRelation && sourceProp.flags & 16777216 /* Optional */ && !(targetProp.flags & 16777216 /* Optional */)) {
+                                // TypeScript 1.0 spec (April 2014): 3.8.3
+                                // S is a subtype of a type T, and T is a supertype of S if ...
+                                // S' and T are object types and, for each member M in T..
+                                // M is a property and S' contains a property N where
+                                // if M is a required property, N is also a required property
+                                // (M - property in T)
+                                // (N - property in S)
                                 if (reportErrors) {
                                     reportError(ts.Diagnostics.Property_0_is_optional_in_type_1_but_required_in_type_2, symbolToString(targetProp), typeToString(source), typeToString(target));
                                 }
-                                return 0;
+                                return 0 /* False */;
                             }
                         }
                     }
                 }
                 return result;
             }
+            /**
+             * A type is 'weak' if it is an object type with at least one optional property
+             * and no required properties, call/construct signatures or index signatures
+             */
             function isWeakType(type) {
-                if (type.flags & 131072) {
+                if (type.flags & 131072 /* Object */) {
                     var resolved = resolveStructuredTypeMembers(type);
                     return resolved.callSignatures.length === 0 && resolved.constructSignatures.length === 0 &&
                         !resolved.stringIndexInfo && !resolved.numberIndexInfo &&
                         resolved.properties.length > 0 &&
-                        ts.every(resolved.properties, function (p) { return !!(p.flags & 16777216); });
+                        ts.every(resolved.properties, function (p) { return !!(p.flags & 16777216 /* Optional */); });
                 }
-                if (type.flags & 524288) {
+                if (type.flags & 524288 /* Intersection */) {
                     return ts.every(type.types, isWeakType);
                 }
                 return false;
             }
             function hasCommonProperties(source, target) {
-                var isComparingJsxAttributes = !!(ts.getObjectFlags(source) & 4096);
+                var isComparingJsxAttributes = !!(ts.getObjectFlags(source) & 4096 /* JsxAttributes */);
                 for (var _i = 0, _a = getPropertiesOfType(source); _i < _a.length; _i++) {
                     var prop = _a[_i];
                     if (isKnownProperty(target, prop.escapedName, isComparingJsxAttributes)) {
@@ -32025,24 +39451,24 @@ var ts;
                 return false;
             }
             function propertiesIdenticalTo(source, target) {
-                if (!(source.flags & 131072 && target.flags & 131072)) {
-                    return 0;
+                if (!(source.flags & 131072 /* Object */ && target.flags & 131072 /* Object */)) {
+                    return 0 /* False */;
                 }
                 var sourceProperties = getPropertiesOfObjectType(source);
                 var targetProperties = getPropertiesOfObjectType(target);
                 if (sourceProperties.length !== targetProperties.length) {
-                    return 0;
+                    return 0 /* False */;
                 }
-                var result = -1;
+                var result = -1 /* True */;
                 for (var _i = 0, sourceProperties_1 = sourceProperties; _i < sourceProperties_1.length; _i++) {
                     var sourceProp = sourceProperties_1[_i];
                     var targetProp = getPropertyOfObjectType(target, sourceProp.escapedName);
                     if (!targetProp) {
-                        return 0;
+                        return 0 /* False */;
                     }
                     var related = compareProperties(sourceProp, targetProp, isRelatedTo);
                     if (!related) {
-                        return 0;
+                        return 0 /* False */;
                     }
                     result &= related;
                 }
@@ -32053,43 +39479,57 @@ var ts;
                     return signaturesIdenticalTo(source, target, kind);
                 }
                 if (target === anyFunctionType || source === anyFunctionType) {
-                    return -1;
+                    return -1 /* True */;
                 }
                 var sourceSignatures = getSignaturesOfType(source, kind);
                 var targetSignatures = getSignaturesOfType(target, kind);
-                if (kind === 1 && sourceSignatures.length && targetSignatures.length) {
+                if (kind === 1 /* Construct */ && sourceSignatures.length && targetSignatures.length) {
                     if (ts.isAbstractConstructorType(source) && !ts.isAbstractConstructorType(target)) {
+                        // An abstract constructor type is not assignable to a non-abstract constructor type
+                        // as it would otherwise be possible to new an abstract class. Note that the assignability
+                        // check we perform for an extends clause excludes construct signatures from the target,
+                        // so this check never proceeds.
                         if (reportErrors) {
                             reportError(ts.Diagnostics.Cannot_assign_an_abstract_constructor_type_to_a_non_abstract_constructor_type);
                         }
-                        return 0;
+                        return 0 /* False */;
                     }
                     if (!constructorVisibilitiesAreCompatible(sourceSignatures[0], targetSignatures[0], reportErrors)) {
-                        return 0;
+                        return 0 /* False */;
                     }
                 }
-                var result = -1;
+                var result = -1 /* True */;
                 var saveErrorInfo = errorInfo;
-                if (ts.getObjectFlags(source) & 64 && ts.getObjectFlags(target) & 64 && source.symbol === target.symbol) {
+                if (ts.getObjectFlags(source) & 64 /* Instantiated */ && ts.getObjectFlags(target) & 64 /* Instantiated */ && source.symbol === target.symbol) {
+                    // We have instantiations of the same anonymous type (which typically will be the type of a
+                    // method). Simply do a pairwise comparison of the signatures in the two signature lists instead
+                    // of the much more expensive N * M comparison matrix we explore below. We erase type parameters
+                    // as they are known to always be the same.
                     for (var i = 0; i < targetSignatures.length; i++) {
-                        var related = signatureRelatedTo(sourceSignatures[i], targetSignatures[i], true, reportErrors);
+                        var related = signatureRelatedTo(sourceSignatures[i], targetSignatures[i], /*erase*/ true, reportErrors);
                         if (!related) {
-                            return 0;
+                            return 0 /* False */;
                         }
                         result &= related;
                     }
                 }
                 else if (sourceSignatures.length === 1 && targetSignatures.length === 1) {
+                    // For simple functions (functions with a single signature) we only erase type parameters for
+                    // the comparable relation. Otherwise, if the source signature is generic, we instantiate it
+                    // in the context of the target signature before checking the relationship. Ideally we'd do
+                    // this regardless of the number of signatures, but the potential costs are prohibitive due
+                    // to the quadratic nature of the logic below.
                     var eraseGenerics = relation === comparableRelation || !!compilerOptions.noStrictGenericChecks;
                     result = signatureRelatedTo(sourceSignatures[0], targetSignatures[0], eraseGenerics, reportErrors);
                 }
                 else {
                     outer: for (var _i = 0, targetSignatures_1 = targetSignatures; _i < targetSignatures_1.length; _i++) {
                         var t = targetSignatures_1[_i];
+                        // Only elaborate errors from the first failure
                         var shouldElaborateErrors = reportErrors;
                         for (var _a = 0, sourceSignatures_1 = sourceSignatures; _a < sourceSignatures_1.length; _a++) {
                             var s = sourceSignatures_1[_a];
-                            var related = signatureRelatedTo(s, t, true, shouldElaborateErrors);
+                            var related = signatureRelatedTo(s, t, /*erase*/ true, shouldElaborateErrors);
                             if (related) {
                                 result &= related;
                                 errorInfo = saveErrorInfo;
@@ -32098,49 +39538,53 @@ var ts;
                             shouldElaborateErrors = false;
                         }
                         if (shouldElaborateErrors) {
-                            reportError(ts.Diagnostics.Type_0_provides_no_match_for_the_signature_1, typeToString(source), signatureToString(t, undefined, undefined, kind));
+                            reportError(ts.Diagnostics.Type_0_provides_no_match_for_the_signature_1, typeToString(source), signatureToString(t, /*enclosingDeclaration*/ undefined, /*flags*/ undefined, kind));
                         }
-                        return 0;
+                        return 0 /* False */;
                     }
                 }
                 return result;
             }
+            /**
+             * See signatureAssignableTo, compareSignaturesIdentical
+             */
             function signatureRelatedTo(source, target, erase, reportErrors) {
-                return compareSignaturesRelated(erase ? getErasedSignature(source) : source, erase ? getErasedSignature(target) : target, 0, false, reportErrors, reportError, isRelatedTo);
+                return compareSignaturesRelated(erase ? getErasedSignature(source) : source, erase ? getErasedSignature(target) : target, 0 /* None */, /*ignoreReturnTypes*/ false, reportErrors, reportError, isRelatedTo);
             }
             function signaturesIdenticalTo(source, target, kind) {
                 var sourceSignatures = getSignaturesOfType(source, kind);
                 var targetSignatures = getSignaturesOfType(target, kind);
                 if (sourceSignatures.length !== targetSignatures.length) {
-                    return 0;
+                    return 0 /* False */;
                 }
-                var result = -1;
+                var result = -1 /* True */;
                 for (var i = 0; i < sourceSignatures.length; i++) {
-                    var related = compareSignaturesIdentical(sourceSignatures[i], targetSignatures[i], false, false, false, isRelatedTo);
+                    var related = compareSignaturesIdentical(sourceSignatures[i], targetSignatures[i], /*partialMatch*/ false, /*ignoreThisTypes*/ false, /*ignoreReturnTypes*/ false, isRelatedTo);
                     if (!related) {
-                        return 0;
+                        return 0 /* False */;
                     }
                     result &= related;
                 }
                 return result;
             }
             function eachPropertyRelatedTo(source, target, kind, reportErrors) {
-                var result = -1;
+                var result = -1 /* True */;
                 for (var _i = 0, _a = getPropertiesOfObjectType(source); _i < _a.length; _i++) {
                     var prop = _a[_i];
-                    if (isIgnoredJsxProperty(source, prop, undefined)) {
+                    if (isIgnoredJsxProperty(source, prop, /*targetMemberType*/ undefined)) {
                         continue;
                     }
-                    if (prop.nameType && prop.nameType.flags & 2048) {
+                    // Skip over symbol-named members
+                    if (prop.nameType && prop.nameType.flags & 2048 /* UniqueESSymbol */) {
                         continue;
                     }
-                    if (kind === 0 || isNumericLiteralName(prop.escapedName)) {
+                    if (kind === 0 /* String */ || isNumericLiteralName(prop.escapedName)) {
                         var related = isRelatedTo(getTypeOfSymbol(prop), target, reportErrors);
                         if (!related) {
                             if (reportErrors) {
                                 reportError(ts.Diagnostics.Property_0_is_incompatible_with_index_signature, symbolToString(prop));
                             }
-                            return 0;
+                            return 0 /* False */;
                         }
                         result &= related;
                     }
@@ -32159,21 +39603,24 @@ var ts;
                     return indexTypesIdenticalTo(source, target, kind);
                 }
                 var targetInfo = getIndexInfoOfType(target, kind);
-                if (!targetInfo || targetInfo.type.flags & 3 && !sourceIsPrimitive) {
-                    return -1;
+                if (!targetInfo || targetInfo.type.flags & 3 /* AnyOrUnknown */ && !sourceIsPrimitive) {
+                    // Index signature of type any permits assignment from everything but primitives
+                    return -1 /* True */;
                 }
                 var sourceInfo = getIndexInfoOfType(source, kind) ||
-                    kind === 1 && getIndexInfoOfType(source, 0);
+                    kind === 1 /* Number */ && getIndexInfoOfType(source, 0 /* String */);
                 if (sourceInfo) {
                     return indexInfoRelatedTo(sourceInfo, targetInfo, reportErrors);
                 }
                 if (isGenericMappedType(source)) {
-                    return (kind === 0 && isRelatedTo(getTemplateTypeFromMappedType(source), targetInfo.type, reportErrors));
+                    // A generic mapped type { [P in K]: T } is related to an index signature { [x: string]: U }
+                    // if T is related to U.
+                    return (kind === 0 /* String */ && isRelatedTo(getTemplateTypeFromMappedType(source), targetInfo.type, reportErrors)); // TODO: GH#18217
                 }
                 if (isObjectTypeWithInferableIndex(source)) {
-                    var related = -1;
-                    if (kind === 0) {
-                        var sourceNumberInfo = getIndexInfoOfType(source, 1);
+                    var related = -1 /* True */;
+                    if (kind === 0 /* String */) {
+                        var sourceNumberInfo = getIndexInfoOfType(source, 1 /* Number */);
                         if (sourceNumberInfo) {
                             related = indexInfoRelatedTo(sourceNumberInfo, targetInfo, reportErrors);
                         }
@@ -32186,32 +39633,35 @@ var ts;
                 if (reportErrors) {
                     reportError(ts.Diagnostics.Index_signature_is_missing_in_type_0, typeToString(source));
                 }
-                return 0;
+                return 0 /* False */;
             }
             function indexTypesIdenticalTo(source, target, indexKind) {
                 var targetInfo = getIndexInfoOfType(target, indexKind);
                 var sourceInfo = getIndexInfoOfType(source, indexKind);
                 if (!sourceInfo && !targetInfo) {
-                    return -1;
+                    return -1 /* True */;
                 }
                 if (sourceInfo && targetInfo && sourceInfo.isReadonly === targetInfo.isReadonly) {
                     return isRelatedTo(sourceInfo.type, targetInfo.type);
                 }
-                return 0;
+                return 0 /* False */;
             }
             function constructorVisibilitiesAreCompatible(sourceSignature, targetSignature, reportErrors) {
                 if (!sourceSignature.declaration || !targetSignature.declaration) {
                     return true;
                 }
-                var sourceAccessibility = ts.getSelectedModifierFlags(sourceSignature.declaration, 24);
-                var targetAccessibility = ts.getSelectedModifierFlags(targetSignature.declaration, 24);
-                if (targetAccessibility === 8) {
+                var sourceAccessibility = ts.getSelectedModifierFlags(sourceSignature.declaration, 24 /* NonPublicAccessibilityModifier */);
+                var targetAccessibility = ts.getSelectedModifierFlags(targetSignature.declaration, 24 /* NonPublicAccessibilityModifier */);
+                // A public, protected and private signature is assignable to a private signature.
+                if (targetAccessibility === 8 /* Private */) {
                     return true;
                 }
-                if (targetAccessibility === 16 && sourceAccessibility !== 8) {
+                // A public and protected signature is assignable to a protected signature.
+                if (targetAccessibility === 16 /* Protected */ && sourceAccessibility !== 8 /* Private */) {
                     return true;
                 }
-                if (targetAccessibility !== 16 && !sourceAccessibility) {
+                // Only a public signature is assignable to public signature.
+                if (targetAccessibility !== 16 /* Protected */ && !sourceAccessibility) {
                     return true;
                 }
                 if (reportErrors) {
@@ -32220,11 +39670,19 @@ var ts;
                 return false;
             }
         }
+        // Return a type reference where the source type parameter is replaced with the target marker
+        // type, and flag the result as a marker type reference.
         function getMarkerTypeReference(type, source, target) {
             var result = createTypeReference(type, ts.map(type.typeParameters, function (t) { return t === source ? target : t; }));
-            result.objectFlags |= 8192;
+            result.objectFlags |= 8192 /* MarkerType */;
             return result;
         }
+        // Return an array containing the variance of each type parameter. The variance is effectively
+        // a digest of the type comparisons that occur for each type argument when instantiations of the
+        // generic type are structurally compared. We infer the variance information by comparing
+        // instantiations of the generic type for type arguments with known relations. The function
+        // returns the emptyArray singleton if we're not in strictFunctionTypes mode or if the function
+        // has been invoked recursively for the given generic type.
         function getVariances(type) {
             if (!strictFunctionTypes) {
                 return ts.emptyArray;
@@ -32233,19 +39691,28 @@ var ts;
             var variances = type.variances;
             if (!variances) {
                 if (type === globalArrayType || type === globalReadonlyArrayType) {
-                    variances = [1];
+                    // Arrays are known to be covariant, no need to spend time computing this
+                    variances = [1 /* Covariant */];
                 }
                 else {
+                    // The emptyArray singleton is used to signal a recursive invocation.
                     type.variances = ts.emptyArray;
                     variances = [];
                     for (var _i = 0, typeParameters_1 = typeParameters; _i < typeParameters_1.length; _i++) {
                         var tp = typeParameters_1[_i];
+                        // We first compare instantiations where the type parameter is replaced with
+                        // marker types that have a known subtype relationship. From this we can infer
+                        // invariance, covariance, contravariance or bivariance.
                         var typeWithSuper = getMarkerTypeReference(type, tp, markerSuperType);
                         var typeWithSub = getMarkerTypeReference(type, tp, markerSubType);
-                        var variance = (isTypeAssignableTo(typeWithSub, typeWithSuper) ? 1 : 0) |
-                            (isTypeAssignableTo(typeWithSuper, typeWithSub) ? 2 : 0);
-                        if (variance === 3 && isTypeAssignableTo(getMarkerTypeReference(type, tp, markerOtherType), typeWithSuper)) {
-                            variance = 4;
+                        var variance = (isTypeAssignableTo(typeWithSub, typeWithSuper) ? 1 /* Covariant */ : 0) |
+                            (isTypeAssignableTo(typeWithSuper, typeWithSub) ? 2 /* Contravariant */ : 0);
+                        // If the instantiations appear to be related bivariantly it may be because the
+                        // type parameter is independent (i.e. it isn't witnessed anywhere in the generic
+                        // type). To determine this we compare instantiations where the type parameter is
+                        // replaced with marker types that are known to be unrelated.
+                        if (variance === 3 /* Bivariant */ && isTypeAssignableTo(getMarkerTypeReference(type, tp, markerOtherType), typeWithSuper)) {
+                            variance = 4 /* Independent */;
                         }
                         variances.push(variance);
                     }
@@ -32254,20 +39721,26 @@ var ts;
             }
             return variances;
         }
+        // Return true if the given type reference has a 'void' type argument for a covariant type parameter.
+        // See comment at call in recursiveTypeRelatedTo for when this case matters.
         function hasCovariantVoidArgument(type, variances) {
             for (var i = 0; i < variances.length; i++) {
-                if (variances[i] === 1 && type.typeArguments[i].flags & 4096) {
+                if (variances[i] === 1 /* Covariant */ && type.typeArguments[i].flags & 4096 /* Void */) {
                     return true;
                 }
             }
             return false;
         }
         function isUnconstrainedTypeParameter(type) {
-            return type.flags & 65536 && !getConstraintFromTypeParameter(type);
+            return type.flags & 65536 /* TypeParameter */ && !getConstraintFromTypeParameter(type);
         }
         function isTypeReferenceWithGenericArguments(type) {
-            return !!(ts.getObjectFlags(type) & 4) && ts.some(type.typeArguments, function (t) { return isUnconstrainedTypeParameter(t) || isTypeReferenceWithGenericArguments(t); });
+            return !!(ts.getObjectFlags(type) & 4 /* Reference */) && ts.some(type.typeArguments, function (t) { return isUnconstrainedTypeParameter(t) || isTypeReferenceWithGenericArguments(t); });
         }
+        /**
+         * getTypeReferenceId(A<T, number, U>) returns "111=0-12=1"
+         *   where A.id=111 and number.id=12
+         */
         function getTypeReferenceId(type, typeParameters, depth) {
             if (depth === void 0) { depth = 0; }
             var result = "" + type.target.id;
@@ -32290,6 +39763,10 @@ var ts;
             }
             return result;
         }
+        /**
+         * To improve caching, the relation key for two generic types uses the target's id plus ids of the type parameters.
+         * For other cases, the types ids are used.
+         */
         function getRelationKey(source, target, relation) {
             if (relation === identityRelation && source.id > target.id) {
                 var temp = source;
@@ -32302,8 +39779,10 @@ var ts;
             }
             return source.id + "," + target.id;
         }
+        // Invoke the callback for each underlying property symbol of the given symbol and return the first
+        // value that isn't undefined.
         function forEachProperty(prop, callback) {
-            if (ts.getCheckFlags(prop) & 6) {
+            if (ts.getCheckFlags(prop) & 6 /* Synthetic */) {
                 for (var _i = 0, _a = prop.containingType.types; _i < _a.length; _i++) {
                     var t = _a[_i];
                     var p = getPropertyOfType(t, prop.escapedName);
@@ -32316,31 +39795,43 @@ var ts;
             }
             return callback(prop);
         }
+        // Return the declaring class type of a property or undefined if property not declared in class
         function getDeclaringClass(prop) {
-            return prop.parent && prop.parent.flags & 32 ? getDeclaredTypeOfSymbol(getParentOfSymbol(prop)) : undefined;
+            return prop.parent && prop.parent.flags & 32 /* Class */ ? getDeclaredTypeOfSymbol(getParentOfSymbol(prop)) : undefined;
         }
+        // Return true if some underlying source property is declared in a class that derives
+        // from the given base class.
         function isPropertyInClassDerivedFrom(prop, baseClass) {
             return forEachProperty(prop, function (sp) {
                 var sourceClass = getDeclaringClass(sp);
                 return sourceClass ? hasBaseType(sourceClass, baseClass) : false;
             });
         }
+        // Return true if source property is a valid override of protected parts of target property.
         function isValidOverrideOf(sourceProp, targetProp) {
-            return !forEachProperty(targetProp, function (tp) { return ts.getDeclarationModifierFlagsFromSymbol(tp) & 16 ?
+            return !forEachProperty(targetProp, function (tp) { return ts.getDeclarationModifierFlagsFromSymbol(tp) & 16 /* Protected */ ?
                 !isPropertyInClassDerivedFrom(sourceProp, getDeclaringClass(tp)) : false; });
         }
+        // Return true if the given class derives from each of the declaring classes of the protected
+        // constituents of the given property.
         function isClassDerivedFromDeclaringClasses(checkClass, prop) {
-            return forEachProperty(prop, function (p) { return ts.getDeclarationModifierFlagsFromSymbol(p) & 16 ?
+            return forEachProperty(prop, function (p) { return ts.getDeclarationModifierFlagsFromSymbol(p) & 16 /* Protected */ ?
                 !hasBaseType(checkClass, getDeclaringClass(p)) : false; }) ? undefined : checkClass;
         }
+        // Return true if the given type is deeply nested. We consider this to be the case when structural type comparisons
+        // for 5 or more occurrences or instantiations of the type have been recorded on the given stack. It is possible,
+        // though highly unlikely, for this test to be true in a situation where a chain of instantiations is not infinitely
+        // expanding. Effectively, we will generate a false positive when two types are structurally equal to at least 5
+        // levels, but unequal at some level beyond that.
         function isDeeplyNestedType(type, stack, depth) {
-            if (depth >= 5 && type.flags & 131072) {
+            // We track all object types that have an associated symbol (representing the origin of the type)
+            if (depth >= 5 && type.flags & 131072 /* Object */) {
                 var symbol = type.symbol;
                 if (symbol) {
                     var count = 0;
                     for (var i = 0; i < depth; i++) {
                         var t = stack[i];
-                        if (t.flags & 131072 && t.symbol === symbol) {
+                        if (t.flags & 131072 /* Object */ && t.symbol === symbol) {
                             count++;
                             if (count >= 5)
                                 return true;
@@ -32351,38 +39842,46 @@ var ts;
             return false;
         }
         function isPropertyIdenticalTo(sourceProp, targetProp) {
-            return compareProperties(sourceProp, targetProp, compareTypesIdentical) !== 0;
+            return compareProperties(sourceProp, targetProp, compareTypesIdentical) !== 0 /* False */;
         }
         function compareProperties(sourceProp, targetProp, compareTypes) {
+            // Two members are considered identical when
+            // - they are public properties with identical names, optionality, and types,
+            // - they are private or protected properties originating in the same declaration and having identical types
             if (sourceProp === targetProp) {
-                return -1;
+                return -1 /* True */;
             }
-            var sourcePropAccessibility = ts.getDeclarationModifierFlagsFromSymbol(sourceProp) & 24;
-            var targetPropAccessibility = ts.getDeclarationModifierFlagsFromSymbol(targetProp) & 24;
+            var sourcePropAccessibility = ts.getDeclarationModifierFlagsFromSymbol(sourceProp) & 24 /* NonPublicAccessibilityModifier */;
+            var targetPropAccessibility = ts.getDeclarationModifierFlagsFromSymbol(targetProp) & 24 /* NonPublicAccessibilityModifier */;
             if (sourcePropAccessibility !== targetPropAccessibility) {
-                return 0;
+                return 0 /* False */;
             }
             if (sourcePropAccessibility) {
                 if (getTargetSymbol(sourceProp) !== getTargetSymbol(targetProp)) {
-                    return 0;
+                    return 0 /* False */;
                 }
             }
             else {
-                if ((sourceProp.flags & 16777216) !== (targetProp.flags & 16777216)) {
-                    return 0;
+                if ((sourceProp.flags & 16777216 /* Optional */) !== (targetProp.flags & 16777216 /* Optional */)) {
+                    return 0 /* False */;
                 }
             }
             if (isReadonlySymbol(sourceProp) !== isReadonlySymbol(targetProp)) {
-                return 0;
+                return 0 /* False */;
             }
             return compareTypes(getTypeOfSymbol(sourceProp), getTypeOfSymbol(targetProp));
         }
         function isMatchingSignature(source, target, partialMatch) {
+            // A source signature matches a target signature if the two signatures have the same number of required,
+            // optional, and rest parameters.
             if (source.parameters.length === target.parameters.length &&
                 source.minArgumentCount === target.minArgumentCount &&
                 source.hasRestParameter === target.hasRestParameter) {
                 return true;
             }
+            // A source signature partially matches a target signature if the target signature has no fewer required
+            // parameters and no more overall parameters than the source signature (where a signature with a rest
+            // parameter is always considered to have more overall parameters than one without).
             var sourceRestCount = source.hasRestParameter ? 1 : 0;
             var targetRestCount = target.hasRestParameter ? 1 : 0;
             if (partialMatch && source.minArgumentCount <= target.minArgumentCount && (sourceRestCount > targetRestCount ||
@@ -32391,19 +39890,30 @@ var ts;
             }
             return false;
         }
+        /**
+         * See signatureRelatedTo, compareSignaturesIdentical
+         */
         function compareSignaturesIdentical(source, target, partialMatch, ignoreThisTypes, ignoreReturnTypes, compareTypes) {
+            // TODO (drosen): De-duplicate code between related functions.
             if (source === target) {
-                return -1;
+                return -1 /* True */;
             }
             if (!(isMatchingSignature(source, target, partialMatch))) {
-                return 0;
+                return 0 /* False */;
             }
+            // Check that the two signatures have the same number of type parameters. We might consider
+            // also checking that any type parameter constraints match, but that would require instantiating
+            // the constraints with a common set of type arguments to get relatable entities in places where
+            // type parameters occur in the constraints. The complexity of doing that doesn't seem worthwhile,
+            // particularly as we're comparing erased versions of the signatures below.
             if (ts.length(source.typeParameters) !== ts.length(target.typeParameters)) {
-                return 0;
+                return 0 /* False */;
             }
+            // Spec 1.0 Section 3.8.3 & 3.8.4:
+            // M and N (the signatures) are instantiated using type Any as the type argument for all type parameters declared by M and N
             source = getErasedSignature(source);
             target = getErasedSignature(target);
-            var result = -1;
+            var result = -1 /* True */;
             if (!ignoreThisTypes) {
                 var sourceThisType = getThisTypeOfSignature(source);
                 if (sourceThisType) {
@@ -32411,7 +39921,7 @@ var ts;
                     if (targetThisType) {
                         var related = compareTypes(sourceThisType, targetThisType);
                         if (!related) {
-                            return 0;
+                            return 0 /* False */;
                         }
                         result &= related;
                     }
@@ -32423,7 +39933,7 @@ var ts;
                 var t = isRestParameterIndex(target, i) ? getRestTypeOfSignature(target) : getTypeOfParameter(target.parameters[i]);
                 var related = compareTypes(s, t);
                 if (!related) {
-                    return 0;
+                    return 0 /* False */;
                 }
                 result &= related;
             }
@@ -32432,12 +39942,13 @@ var ts;
                 var targetTypePredicate = getTypePredicateOfSignature(target);
                 result &= sourceTypePredicate !== undefined || targetTypePredicate !== undefined
                     ? compareTypePredicatesIdentical(sourceTypePredicate, targetTypePredicate, compareTypes)
+                    // If they're both type predicates their return types will both be `boolean`, so no need to compare those.
                     : compareTypes(getReturnTypeOfSignature(source), getReturnTypeOfSignature(target));
             }
             return result;
         }
         function compareTypePredicatesIdentical(source, target, compareTypes) {
-            return source === undefined || target === undefined || !typePredicateKindsMatch(source, target) ? 0 : compareTypes(source.type, target.type);
+            return source === undefined || target === undefined || !typePredicateKindsMatch(source, target) ? 0 /* False */ : compareTypes(source.type, target.type);
         }
         function isRestParameterIndex(signature, parameterIndex) {
             return signature.hasRestParameter && parameterIndex >= signature.parameters.length - 1;
@@ -32456,6 +39967,9 @@ var ts;
             }
             return true;
         }
+        // When the candidate types are all literal types with the same base type, return a union
+        // of those literal types. Otherwise, return the leftmost type for which no type to the
+        // right is a supertype.
         function getSupertypeOrUnion(types) {
             return literalTypesWithSameBaseType(types) ?
                 getUnionType(types) :
@@ -32465,20 +39979,23 @@ var ts;
             if (!strictNullChecks) {
                 return getSupertypeOrUnion(types);
             }
-            var primaryTypes = ts.filter(types, function (t) { return !(t.flags & 24576); });
+            var primaryTypes = ts.filter(types, function (t) { return !(t.flags & 24576 /* Nullable */); });
             return primaryTypes.length ?
-                getNullableType(getSupertypeOrUnion(primaryTypes), getFalsyFlagsOfTypes(types) & 24576) :
-                getUnionType(types, 2);
+                getNullableType(getSupertypeOrUnion(primaryTypes), getFalsyFlagsOfTypes(types) & 24576 /* Nullable */) :
+                getUnionType(types, 2 /* Subtype */);
         }
+        // Return the leftmost type for which no type to the right is a subtype.
         function getCommonSubtype(types) {
             return ts.reduceLeft(types, function (s, t) { return isTypeSubtypeOf(t, s) ? t : s; });
         }
         function isArrayType(type) {
-            return !!(ts.getObjectFlags(type) & 4) && type.target === globalArrayType;
+            return !!(ts.getObjectFlags(type) & 4 /* Reference */) && type.target === globalArrayType;
         }
         function isArrayLikeType(type) {
-            return ts.getObjectFlags(type) & 4 && (type.target === globalArrayType || type.target === globalReadonlyArrayType) ||
-                !(type.flags & 24576) && isTypeAssignableTo(type, anyReadonlyArrayType);
+            // A type is array-like if it is a reference to the global Array or global ReadonlyArray type,
+            // or if it is not the undefined or null type and if it is assignable to ReadonlyArray<any>
+            return ts.getObjectFlags(type) & 4 /* Reference */ && (type.target === globalArrayType || type.target === globalReadonlyArrayType) ||
+                !(type.flags & 24576 /* Nullable */) && isTypeAssignableTo(type, anyReadonlyArrayType);
         }
         function isEmptyArrayLiteralType(type) {
             var elementType = isArrayType(type) ? type.typeArguments[0] : undefined;
@@ -32488,35 +40005,35 @@ var ts;
             return !!getPropertyOfType(type, "0");
         }
         function isNeitherUnitTypeNorNever(type) {
-            return !(type.flags & (27072 | 32768));
+            return !(type.flags & (27072 /* Unit */ | 32768 /* Never */));
         }
         function isUnitType(type) {
-            return !!(type.flags & 27072);
+            return !!(type.flags & 27072 /* Unit */);
         }
         function isLiteralType(type) {
-            return type.flags & 16 ? true :
-                type.flags & 262144 ? type.flags & 512 ? true : !ts.forEach(type.types, function (t) { return !isUnitType(t); }) :
+            return type.flags & 16 /* Boolean */ ? true :
+                type.flags & 262144 /* Union */ ? type.flags & 512 /* EnumLiteral */ ? true : ts.every(type.types, isUnitType) :
                     isUnitType(type);
         }
         function getBaseTypeOfLiteralType(type) {
-            return type.flags & 512 ? getBaseTypeOfEnumLiteralType(type) :
-                type.flags & 64 ? stringType :
-                    type.flags & 128 ? numberType :
-                        type.flags & 256 ? booleanType :
-                            type.flags & 262144 ? getUnionType(ts.sameMap(type.types, getBaseTypeOfLiteralType)) :
+            return type.flags & 512 /* EnumLiteral */ ? getBaseTypeOfEnumLiteralType(type) :
+                type.flags & 64 /* StringLiteral */ ? stringType :
+                    type.flags & 128 /* NumberLiteral */ ? numberType :
+                        type.flags & 256 /* BooleanLiteral */ ? booleanType :
+                            type.flags & 262144 /* Union */ ? getUnionType(ts.sameMap(type.types, getBaseTypeOfLiteralType)) :
                                 type;
         }
         function getWidenedLiteralType(type) {
-            return type.flags & 512 ? getBaseTypeOfEnumLiteralType(type) :
-                type.flags & 64 && type.flags & 33554432 ? stringType :
-                    type.flags & 128 && type.flags & 33554432 ? numberType :
-                        type.flags & 256 ? booleanType :
-                            type.flags & 262144 ? getUnionType(ts.sameMap(type.types, getWidenedLiteralType)) :
+            return type.flags & 512 /* EnumLiteral */ ? getBaseTypeOfEnumLiteralType(type) :
+                type.flags & 64 /* StringLiteral */ && type.flags & 33554432 /* FreshLiteral */ ? stringType :
+                    type.flags & 128 /* NumberLiteral */ && type.flags & 33554432 /* FreshLiteral */ ? numberType :
+                        type.flags & 256 /* BooleanLiteral */ ? booleanType :
+                            type.flags & 262144 /* Union */ ? getUnionType(ts.sameMap(type.types, getWidenedLiteralType)) :
                                 type;
         }
         function getWidenedUniqueESSymbolType(type) {
-            return type.flags & 2048 ? esSymbolType :
-                type.flags & 262144 ? getUnionType(ts.sameMap(type.types, getWidenedUniqueESSymbolType)) :
+            return type.flags & 2048 /* UniqueESSymbol */ ? esSymbolType :
+                type.flags & 262144 /* Union */ ? getUnionType(ts.sameMap(type.types, getWidenedUniqueESSymbolType)) :
                     type;
         }
         function getWidenedLiteralLikeTypeForContextualType(type, contextualType) {
@@ -32525,8 +40042,12 @@ var ts;
             }
             return type;
         }
+        /**
+         * Check if a Type was written as a tuple type literal.
+         * Prefer using isTupleLikeType() unless the use of `elementTypes` is required.
+         */
         function isTupleType(type) {
-            return !!(ts.getObjectFlags(type) & 4 && type.target.objectFlags & 8);
+            return !!(ts.getObjectFlags(type) & 4 /* Reference */ && type.target.objectFlags & 8 /* Tuple */);
         }
         function getFalsyFlagsOfTypes(types) {
             var result = 0;
@@ -32536,55 +40057,68 @@ var ts;
             }
             return result;
         }
+        // Returns the String, Number, Boolean, StringLiteral, NumberLiteral, BooleanLiteral, Void, Undefined, or Null
+        // flags for the string, number, boolean, "", 0, false, void, undefined, or null types respectively. Returns
+        // no flags for all other types (including non-falsy literal types).
         function getFalsyFlags(type) {
-            return type.flags & 262144 ? getFalsyFlagsOfTypes(type.types) :
-                type.flags & 64 ? type.value === "" ? 64 : 0 :
-                    type.flags & 128 ? type.value === 0 ? 128 : 0 :
-                        type.flags & 256 ? type === falseType ? 256 : 0 :
-                            type.flags & 29148;
+            return type.flags & 262144 /* Union */ ? getFalsyFlagsOfTypes(type.types) :
+                type.flags & 64 /* StringLiteral */ ? type.value === "" ? 64 /* StringLiteral */ : 0 :
+                    type.flags & 128 /* NumberLiteral */ ? type.value === 0 ? 128 /* NumberLiteral */ : 0 :
+                        type.flags & 256 /* BooleanLiteral */ ? type === falseType ? 256 /* BooleanLiteral */ : 0 :
+                            type.flags & 29148 /* PossiblyFalsy */;
         }
         function removeDefinitelyFalsyTypes(type) {
-            return getFalsyFlags(type) & 29120 ?
-                filterType(type, function (t) { return !(getFalsyFlags(t) & 29120); }) :
+            return getFalsyFlags(type) & 29120 /* DefinitelyFalsy */ ?
+                filterType(type, function (t) { return !(getFalsyFlags(t) & 29120 /* DefinitelyFalsy */); }) :
                 type;
         }
         function extractDefinitelyFalsyTypes(type) {
             return mapType(type, getDefinitelyFalsyPartOfType);
         }
         function getDefinitelyFalsyPartOfType(type) {
-            return type.flags & 4 ? emptyStringType :
-                type.flags & 8 ? zeroType :
-                    type.flags & 16 || type === falseType ? falseType :
-                        type.flags & (4096 | 8192 | 16384) ||
-                            type.flags & 64 && type.value === "" ||
-                            type.flags & 128 && type.value === 0 ? type :
+            return type.flags & 4 /* String */ ? emptyStringType :
+                type.flags & 8 /* Number */ ? zeroType :
+                    type.flags & 16 /* Boolean */ || type === falseType ? falseType :
+                        type.flags & (4096 /* Void */ | 8192 /* Undefined */ | 16384 /* Null */) ||
+                            type.flags & 64 /* StringLiteral */ && type.value === "" ||
+                            type.flags & 128 /* NumberLiteral */ && type.value === 0 ? type :
                             neverType;
         }
+        /**
+         * Add undefined or null or both to a type if they are missing.
+         * @param type - type to add undefined and/or null to if not present
+         * @param flags - Either TypeFlags.Undefined or TypeFlags.Null, or both
+         */
         function getNullableType(type, flags) {
-            var missing = (flags & ~type.flags) & (8192 | 16384);
+            var missing = (flags & ~type.flags) & (8192 /* Undefined */ | 16384 /* Null */);
             return missing === 0 ? type :
-                missing === 8192 ? getUnionType([type, undefinedType]) :
-                    missing === 16384 ? getUnionType([type, nullType]) :
+                missing === 8192 /* Undefined */ ? getUnionType([type, undefinedType]) :
+                    missing === 16384 /* Null */ ? getUnionType([type, nullType]) :
                         getUnionType([type, undefinedType, nullType]);
         }
         function getOptionalType(type) {
             ts.Debug.assert(strictNullChecks);
-            return type.flags & 8192 ? type : getUnionType([type, undefinedType]);
+            return type.flags & 8192 /* Undefined */ ? type : getUnionType([type, undefinedType]);
         }
         function getGlobalNonNullableTypeInstantiation(type) {
             if (!deferredGlobalNonNullableTypeAlias) {
-                deferredGlobalNonNullableTypeAlias = getGlobalSymbol("NonNullable", 524288, undefined) || unknownSymbol;
+                deferredGlobalNonNullableTypeAlias = getGlobalSymbol("NonNullable", 524288 /* TypeAlias */, /*diagnostic*/ undefined) || unknownSymbol;
             }
+            // Use NonNullable global type alias if available to improve quick info/declaration emit
             if (deferredGlobalNonNullableTypeAlias !== unknownSymbol) {
                 return getTypeAliasInstantiation(deferredGlobalNonNullableTypeAlias, [type]);
             }
-            return getTypeWithFacts(type, 524288);
+            return getTypeWithFacts(type, 524288 /* NEUndefinedOrNull */); // Type alias unavailable, fall back to non-higherorder behavior
         }
         function getNonNullableType(type) {
             return strictNullChecks ? getGlobalNonNullableTypeInstantiation(type) : type;
         }
+        /**
+         * Return true if type was inferred from an object literal, written as an object type literal, or is the shape of a module
+         * with no call or construct signatures.
+         */
         function isObjectTypeWithInferableIndex(type) {
-            return type.symbol && (type.symbol.flags & (4096 | 2048 | 512)) !== 0 &&
+            return type.symbol && (type.symbol.flags & (4096 /* ObjectLiteral */ | 2048 /* TypeLiteral */ | 512 /* ValueModule */)) !== 0 &&
                 !typeHasCallOrConstructSignatures(type);
         }
         function createSymbolWithType(source, type) {
@@ -32611,8 +40145,13 @@ var ts;
             }
             return members;
         }
+        /**
+         * If the the provided object literal is subject to the excess properties check,
+         * create a new that is exempt. Recursively mark object literal members as exempt.
+         * Leave signatures alone since they are not subject to the check.
+         */
         function getRegularTypeOfObjectLiteral(type) {
-            if (!(isObjectLiteralType(type) && type.flags & 33554432)) {
+            if (!(isObjectLiteralType(type) && type.flags & 33554432 /* FreshLiteral */)) {
                 return type;
             }
             var regularType = type.regularType;
@@ -32622,8 +40161,8 @@ var ts;
             var resolved = type;
             var members = transformTypeOfMembers(type, getRegularTypeOfObjectLiteral);
             var regularNew = createAnonymousType(resolved.symbol, members, resolved.callSignatures, resolved.constructSignatures, resolved.stringIndexInfo, resolved.numberIndexInfo);
-            regularNew.flags = resolved.flags & ~33554432;
-            regularNew.objectFlags |= 128;
+            regularNew.flags = resolved.flags & ~33554432 /* FreshLiteral */;
+            regularNew.objectFlags |= 128 /* ObjectLiteral */;
             type.regularType = regularNew;
             return regularNew;
         }
@@ -32653,7 +40192,7 @@ var ts;
                 var names = ts.createMap();
                 for (var _i = 0, _a = getSiblingsOfContext(context); _i < _a.length; _i++) {
                     var t = _a[_i];
-                    if (isObjectLiteralType(t) && !(ts.getObjectFlags(t) & 1024)) {
+                    if (isObjectLiteralType(t) && !(ts.getObjectFlags(t) & 1024 /* ContainsSpread */)) {
                         for (var _b = 0, _c = getPropertiesOfType(t); _b < _c.length; _b++) {
                             var prop = _c[_b];
                             names.set(prop.escapedName, prop);
@@ -32665,8 +40204,21 @@ var ts;
             return context.resolvedProperties;
         }
         function getWidenedProperty(prop, context) {
+            if (!(prop.flags & 4 /* Property */)) {
+                // Since get accessors already widen their return value there is no need to
+                // widen accessor based properties here.
+                return prop;
+            }
+            if (prop.flags & 67108864 /* JSContainer */) {
+                var node = prop.declarations && ts.first(prop.declarations);
+                var init = ts.getAssignedJavascriptInitializer(node);
+                if (init && init.kind !== 184 /* ObjectLiteralExpression */) {
+                    // for JS special declarations, the only kind of initializer that will widen is object literals
+                    return prop;
+                }
+            }
             var original = getTypeOfSymbol(prop);
-            var propContext = context && createWideningContext(context, prop.escapedName, undefined);
+            var propContext = context && createWideningContext(context, prop.escapedName, /*siblings*/ undefined);
             var widened = getWidenedTypeWithContext(original, propContext);
             return widened === original ? prop : createSymbolWithType(prop, widened);
         }
@@ -32676,7 +40228,7 @@ var ts;
                 return cached;
             }
             var result = createSymbolWithType(prop, undefinedType);
-            result.flags |= 16777216;
+            result.flags |= 16777216 /* Optional */;
             undefinedProperties.set(prop.escapedName, result);
             return result;
         }
@@ -32684,7 +40236,7 @@ var ts;
             var members = ts.createSymbolTable();
             for (var _i = 0, _a = getPropertiesOfObjectType(type); _i < _a.length; _i++) {
                 var prop = _a[_i];
-                members.set(prop.escapedName, prop.flags & 4 ? getWidenedProperty(prop, context) : prop);
+                members.set(prop.escapedName, getWidenedProperty(prop, context));
             }
             if (context) {
                 for (var _b = 0, _c = getPropertiesOfContext(context); _b < _c.length; _b++) {
@@ -32694,25 +40246,28 @@ var ts;
                     }
                 }
             }
-            var stringIndexInfo = getIndexInfoOfType(type, 0);
-            var numberIndexInfo = getIndexInfoOfType(type, 1);
+            var stringIndexInfo = getIndexInfoOfType(type, 0 /* String */);
+            var numberIndexInfo = getIndexInfoOfType(type, 1 /* Number */);
             return createAnonymousType(type.symbol, members, ts.emptyArray, ts.emptyArray, stringIndexInfo && createIndexInfo(getWidenedType(stringIndexInfo.type), stringIndexInfo.isReadonly), numberIndexInfo && createIndexInfo(getWidenedType(numberIndexInfo.type), numberIndexInfo.isReadonly));
         }
         function getWidenedType(type) {
-            return getWidenedTypeWithContext(type, undefined);
+            return getWidenedTypeWithContext(type, /*context*/ undefined);
         }
         function getWidenedTypeWithContext(type, context) {
-            if (type.flags & 402653184) {
-                if (type.flags & 24576) {
+            if (type.flags & 402653184 /* RequiresWidening */) {
+                if (type.flags & 24576 /* Nullable */) {
                     return anyType;
                 }
                 if (isObjectLiteralType(type)) {
                     return getWidenedTypeOfObjectLiteral(type, context);
                 }
-                if (type.flags & 262144) {
-                    var unionContext_1 = context || createWideningContext(undefined, undefined, type.types);
-                    var widenedTypes = ts.sameMap(type.types, function (t) { return t.flags & 24576 ? t : getWidenedTypeWithContext(t, unionContext_1); });
-                    return getUnionType(widenedTypes, ts.some(widenedTypes, isEmptyObjectType) ? 2 : 1);
+                if (type.flags & 262144 /* Union */) {
+                    var unionContext_1 = context || createWideningContext(/*parent*/ undefined, /*propertyName*/ undefined, type.types);
+                    var widenedTypes = ts.sameMap(type.types, function (t) { return t.flags & 24576 /* Nullable */ ? t : getWidenedTypeWithContext(t, unionContext_1); });
+                    // Widening an empty object literal transitions from a highly restrictive type to
+                    // a highly inclusive one. For that reason we perform subtype reduction here if the
+                    // union includes empty object types (e.g. reducing {} | string to just {}).
+                    return getUnionType(widenedTypes, ts.some(widenedTypes, isEmptyObjectType) ? 2 /* Subtype */ : 1 /* Literal */);
                 }
                 if (isArrayType(type) || isTupleType(type)) {
                     return createTypeReference(type.target, ts.sameMap(type.typeArguments, getWidenedType));
@@ -32720,10 +40275,21 @@ var ts;
             }
             return type;
         }
+        /**
+         * Reports implicit any errors that occur as a result of widening 'null' and 'undefined'
+         * to 'any'. A call to reportWideningErrorsInType is normally accompanied by a call to
+         * getWidenedType. But in some cases getWidenedType is called without reporting errors
+         * (type argument inference is an example).
+         *
+         * The return value indicates whether an error was in fact reported. The particular circumstances
+         * are on a best effort basis. Currently, if the null or undefined that causes widening is inside
+         * an object literal property (arbitrarily deeply), this function reports an error. If no error is
+         * reported, reportImplicitAnyError is a suitable fallback to report a general error.
+         */
         function reportWideningErrorsInType(type) {
             var errorReported = false;
-            if (type.flags & 134217728) {
-                if (type.flags & 262144) {
+            if (type.flags & 134217728 /* ContainsWideningType */) {
+                if (type.flags & 262144 /* Union */) {
                     if (ts.some(type.types, isEmptyObjectType)) {
                         errorReported = true;
                     }
@@ -32748,7 +40314,7 @@ var ts;
                     for (var _d = 0, _e = getPropertiesOfObjectType(type); _d < _e.length; _d++) {
                         var p = _e[_d];
                         var t = getTypeOfSymbol(p);
-                        if (t.flags & 134217728) {
+                        if (t.flags & 134217728 /* ContainsWideningType */) {
                             if (!reportWideningErrorsInType(t)) {
                                 error(p.valueDeclaration, ts.Diagnostics.Object_literal_s_property_0_implicitly_has_an_1_type, symbolToString(p), typeToString(getWidenedType(t)));
                             }
@@ -32763,33 +40329,33 @@ var ts;
             var typeAsString = typeToString(getWidenedType(type));
             var diagnostic;
             switch (declaration.kind) {
-                case 200:
-                case 152:
-                case 151:
+                case 200 /* BinaryExpression */:
+                case 152 /* PropertyDeclaration */:
+                case 151 /* PropertySignature */:
                     diagnostic = ts.Diagnostics.Member_0_implicitly_has_an_1_type;
                     break;
-                case 149:
+                case 149 /* Parameter */:
                     diagnostic = declaration.dotDotDotToken ?
                         ts.Diagnostics.Rest_parameter_0_implicitly_has_an_any_type :
                         ts.Diagnostics.Parameter_0_implicitly_has_an_1_type;
                     break;
-                case 182:
+                case 182 /* BindingElement */:
                     diagnostic = ts.Diagnostics.Binding_element_0_implicitly_has_an_1_type;
                     break;
-                case 234:
-                case 154:
-                case 153:
-                case 156:
-                case 157:
-                case 192:
-                case 193:
+                case 234 /* FunctionDeclaration */:
+                case 154 /* MethodDeclaration */:
+                case 153 /* MethodSignature */:
+                case 156 /* GetAccessor */:
+                case 157 /* SetAccessor */:
+                case 192 /* FunctionExpression */:
+                case 193 /* ArrowFunction */:
                     if (!declaration.name) {
                         error(declaration, ts.Diagnostics.Function_expression_which_lacks_return_type_annotation_implicitly_has_an_0_return_type, typeAsString);
                         return;
                     }
                     diagnostic = ts.Diagnostics._0_which_lacks_return_type_annotation_implicitly_has_an_1_return_type;
                     break;
-                case 177:
+                case 177 /* MappedType */:
                     error(declaration, ts.Diagnostics.Mapped_object_type_implicitly_has_an_any_template_type);
                     return;
                 default:
@@ -32798,7 +40364,8 @@ var ts;
             error(declaration, diagnostic, ts.declarationNameToString(ts.getNameOfDeclaration(declaration)), typeAsString);
         }
         function reportErrorsFromWidening(declaration, type) {
-            if (produceDiagnostics && noImplicitAny && type.flags & 134217728) {
+            if (produceDiagnostics && noImplicitAny && type.flags & 134217728 /* ContainsWideningType */) {
+                // Report implicit any error within type if possible, otherwise report error on declaration
                 if (!reportWideningErrorsInType(type)) {
                     reportImplicitAnyError(declaration, type);
                 }
@@ -32865,13 +40432,16 @@ var ts;
                 isFixed: inference.isFixed
             };
         }
+        // Return true if the given type could possibly reference a type parameter for which
+        // we perform type inference (i.e. a type parameter of a generic function). We cache
+        // results for union and intersection types for performance reasons.
         function couldContainTypeVariables(type) {
             var objectFlags = ts.getObjectFlags(type);
-            return !!(type.flags & 15794176 ||
-                objectFlags & 4 && ts.forEach(type.typeArguments, couldContainTypeVariables) ||
-                objectFlags & 16 && type.symbol && type.symbol.flags & (16 | 8192 | 2048 | 32) ||
-                objectFlags & 32 ||
-                type.flags & 786432 && couldUnionOrIntersectionContainTypeVariables(type));
+            return !!(type.flags & 15794176 /* Instantiable */ ||
+                objectFlags & 4 /* Reference */ && ts.forEach(type.typeArguments, couldContainTypeVariables) ||
+                objectFlags & 16 /* Anonymous */ && type.symbol && type.symbol.flags & (16 /* Function */ | 8192 /* Method */ | 2048 /* TypeLiteral */ | 32 /* Class */) ||
+                objectFlags & 32 /* Mapped */ ||
+                type.flags & 786432 /* UnionOrIntersection */ && couldUnionOrIntersectionContainTypeVariables(type));
         }
         function couldUnionOrIntersectionContainTypeVariables(type) {
             if (type.couldContainTypeVariables === undefined) {
@@ -32880,16 +40450,17 @@ var ts;
             return type.couldContainTypeVariables;
         }
         function isTypeParameterAtTopLevel(type, typeParameter) {
-            return type === typeParameter || !!(type.flags & 786432) && ts.some(type.types, function (t) { return isTypeParameterAtTopLevel(t, typeParameter); });
+            return type === typeParameter || !!(type.flags & 786432 /* UnionOrIntersection */) && ts.some(type.types, function (t) { return isTypeParameterAtTopLevel(t, typeParameter); });
         }
+        /** Create an object with properties named in the string literal type. Every property has type `any` */
         function createEmptyObjectTypeFromStringLiteral(type) {
             var members = ts.createSymbolTable();
             forEachType(type, function (t) {
-                if (!(t.flags & 64)) {
+                if (!(t.flags & 64 /* StringLiteral */)) {
                     return;
                 }
                 var name = ts.escapeLeadingUnderscores(t.value);
-                var literalProp = createSymbol(4, name);
+                var literalProp = createSymbol(4 /* Property */, name);
                 literalProp.type = anyType;
                 if (t.symbol) {
                     literalProp.declarations = t.symbol.declarations;
@@ -32897,9 +40468,15 @@ var ts;
                 }
                 members.set(name, literalProp);
             });
-            var indexInfo = type.flags & 4 ? createIndexInfo(emptyObjectType, false) : undefined;
+            var indexInfo = type.flags & 4 /* String */ ? createIndexInfo(emptyObjectType, /*isReadonly*/ false) : undefined;
             return createAnonymousType(undefined, members, ts.emptyArray, ts.emptyArray, indexInfo, undefined);
         }
+        /**
+         * Infer a suitable input type for a homomorphic mapped type { [P in keyof T]: X }. We construct
+         * an object type with the same set of properties as the source type, where the type of each
+         * property is computed by inferring from the source property type to X for the type
+         * variable T[P] (i.e. we treat the type T[P] as the type variable we're inferring for).
+         */
         function inferTypeForHomomorphicMappedType(source, target) {
             var key = source.id + "," + target.id;
             if (reverseMappedCache.has(key)) {
@@ -32912,16 +40489,18 @@ var ts;
         }
         function createReverseMappedType(source, target) {
             var properties = getPropertiesOfType(source);
-            if (properties.length === 0 && !getIndexInfoOfType(source, 0)) {
+            if (properties.length === 0 && !getIndexInfoOfType(source, 0 /* String */)) {
                 return undefined;
             }
+            // If any property contains context sensitive functions that have been skipped, the source type
+            // is incomplete and we can't infer a meaningful input type.
             for (var _i = 0, properties_4 = properties; _i < properties_4.length; _i++) {
                 var prop = properties_4[_i];
-                if (getTypeOfSymbol(prop).flags & 536870912) {
+                if (getTypeOfSymbol(prop).flags & 536870912 /* ContainsAnyFunctionType */) {
                     return undefined;
                 }
             }
-            var reversed = createObjectType(2048 | 16, undefined);
+            var reversed = createObjectType(2048 /* ReverseMapped */ | 16 /* Anonymous */, /*symbol*/ undefined);
             reversed.source = source;
             reversed.mappedType = target;
             return reversed;
@@ -32937,10 +40516,10 @@ var ts;
             return getTypeFromInference(inference);
         }
         function getUnmatchedProperty(source, target, requireOptionalProperties) {
-            var properties = target.flags & 524288 ? getPropertiesOfUnionOrIntersectionType(target) : getPropertiesOfObjectType(target);
+            var properties = target.flags & 524288 /* Intersection */ ? getPropertiesOfUnionOrIntersectionType(target) : getPropertiesOfObjectType(target);
             for (var _i = 0, properties_5 = properties; _i < properties_5.length; _i++) {
                 var targetProp = properties_5[_i];
-                if (requireOptionalProperties || !(targetProp.flags & 16777216)) {
+                if (requireOptionalProperties || !(targetProp.flags & 16777216 /* Optional */)) {
                     var sourceProp = getPropertyOfType(source, targetProp.escapedName);
                     if (!sourceProp) {
                         return targetProp;
@@ -32950,11 +40529,13 @@ var ts;
             return undefined;
         }
         function typesDefinitelyUnrelated(source, target) {
+            // Two tuple types with different arity are definitely unrelated.
+            // Two object types that each have a property that is unmatched in the other are definitely unrelated.
             return isTupleType(source) && isTupleType(target) && getTypeReferenceArity(source) !== getTypeReferenceArity(target) ||
-                !!getUnmatchedProperty(source, target, false) && !!getUnmatchedProperty(target, source, false);
+                !!getUnmatchedProperty(source, target, /*requireOptionalProperties*/ false) && !!getUnmatchedProperty(target, source, /*requireOptionalProperties*/ false);
         }
         function getTypeFromInference(inference) {
-            return inference.candidates ? getUnionType(inference.candidates, 2) :
+            return inference.candidates ? getUnionType(inference.candidates, 2 /* Subtype */) :
                 inference.contraCandidates ? getIntersectionType(inference.contraCandidates) :
                     emptyObjectType;
         }
@@ -32970,6 +40551,9 @@ var ts;
                     return;
                 }
                 if (source === wildcardType) {
+                    // We are inferring from an 'any' type. We want to infer this type for every type parameter
+                    // referenced in the target type, so we record it as the propagation type and infer from the
+                    // target to itself. Then, as we find candidates we substitute the propagation type.
                     var savePropagationType = propagationType;
                     propagationType = source;
                     inferFromTypes(target, target);
@@ -32977,6 +40561,8 @@ var ts;
                     return;
                 }
                 if (source.aliasSymbol && source.aliasTypeArguments && source.aliasSymbol === target.aliasSymbol) {
+                    // Source and target are types originating in the same generic type alias declaration.
+                    // Simply infer from source type arguments to target type arguments.
                     var sourceTypes = source.aliasTypeArguments;
                     var targetTypes = target.aliasTypeArguments;
                     for (var i = 0; i < sourceTypes.length; i++) {
@@ -32984,8 +40570,10 @@ var ts;
                     }
                     return;
                 }
-                if (source.flags & 262144 && target.flags & 262144 && !(source.flags & 512 && target.flags & 512) ||
-                    source.flags & 524288 && target.flags & 524288) {
+                if (source.flags & 262144 /* Union */ && target.flags & 262144 /* Union */ && !(source.flags & 512 /* EnumLiteral */ && target.flags & 512 /* EnumLiteral */) ||
+                    source.flags & 524288 /* Intersection */ && target.flags & 524288 /* Intersection */) {
+                    // Source and target are both unions or both intersections. If source and target
+                    // are the same type, just relate each constituent type to itself.
                     if (source === target) {
                         for (var _i = 0, _a = source.types; _i < _a.length; _i++) {
                             var t = _a[_i];
@@ -32993,6 +40581,12 @@ var ts;
                         }
                         return;
                     }
+                    // Find each source constituent type that has an identically matching target constituent
+                    // type, and for each such type infer from the type to itself. When inferring from a
+                    // type to itself we effectively find all type parameter occurrences within that type
+                    // and infer themselves as their type arguments. We have special handling for numeric
+                    // and string literals because the number and string types are not represented as unions
+                    // of all their possible values.
                     var matchingTypes = void 0;
                     for (var _b = 0, _c = source.types; _b < _c.length; _b++) {
                         var t = _c[_b];
@@ -33000,20 +40594,30 @@ var ts;
                             (matchingTypes || (matchingTypes = [])).push(t);
                             inferFromTypes(t, t);
                         }
-                        else if (t.flags & (128 | 64)) {
+                        else if (t.flags & (128 /* NumberLiteral */ | 64 /* StringLiteral */)) {
                             var b = getBaseTypeOfLiteralType(t);
                             if (typeIdenticalToSomeType(b, target.types)) {
                                 (matchingTypes || (matchingTypes = [])).push(t, b);
                             }
                         }
                     }
+                    // Next, to improve the quality of inferences, reduce the source and target types by
+                    // removing the identically matched constituents. For example, when inferring from
+                    // 'string | string[]' to 'string | T' we reduce the types to 'string[]' and 'T'.
                     if (matchingTypes) {
                         source = removeTypesFromUnionOrIntersection(source, matchingTypes);
                         target = removeTypesFromUnionOrIntersection(target, matchingTypes);
                     }
                 }
-                if (target.flags & 2162688) {
-                    if (source.flags & 536870912 || source === silentNeverType) {
+                if (target.flags & 2162688 /* TypeVariable */) {
+                    // If target is a type parameter, make an inference, unless the source type contains
+                    // the anyFunctionType (the wildcard type that's used to avoid contextually typing functions).
+                    // Because the anyFunctionType is internal, it should not be exposed to the user by adding
+                    // it as an inference candidate. Hopefully, a better candidate will come along that does
+                    // not contain anyFunctionType when we come back to this argument for its second round
+                    // of inference. Also, we exclude inferences for silentNeverType (which is used as a wildcard
+                    // when constructing types from type parameters that had no inference candidates).
+                    if (source.flags & 536870912 /* ContainsAnyFunctionType */ || source === silentNeverType) {
                         return;
                     }
                     var inference = getInferenceInfoForType(target);
@@ -33033,20 +40637,21 @@ var ts;
                                     inference.candidates = ts.append(inference.candidates, candidate);
                                 }
                             }
-                            if (!(priority & 8) && target.flags & 65536 && !isTypeParameterAtTopLevel(originalTarget, target)) {
+                            if (!(priority & 8 /* ReturnType */) && target.flags & 65536 /* TypeParameter */ && !isTypeParameterAtTopLevel(originalTarget, target)) {
                                 inference.topLevel = false;
                             }
                         }
                         return;
                     }
                 }
-                if (ts.getObjectFlags(source) & 4 && ts.getObjectFlags(target) & 4 && source.target === target.target) {
+                if (ts.getObjectFlags(source) & 4 /* Reference */ && ts.getObjectFlags(target) & 4 /* Reference */ && source.target === target.target) {
+                    // If source and target are references to the same generic type, infer from type arguments
                     var sourceTypes = source.typeArguments || ts.emptyArray;
                     var targetTypes = target.typeArguments || ts.emptyArray;
                     var count = sourceTypes.length < targetTypes.length ? sourceTypes.length : targetTypes.length;
                     var variances = getVariances(source.target);
                     for (var i = 0; i < count; i++) {
-                        if (i < variances.length && variances[i] === 2) {
+                        if (i < variances.length && variances[i] === 2 /* Contravariant */) {
                             inferFromContravariantTypes(sourceTypes[i], targetTypes[i]);
                         }
                         else {
@@ -33054,34 +40659,35 @@ var ts;
                         }
                     }
                 }
-                else if (source.flags & 1048576 && target.flags & 1048576) {
+                else if (source.flags & 1048576 /* Index */ && target.flags & 1048576 /* Index */) {
                     contravariant = !contravariant;
                     inferFromTypes(source.type, target.type);
                     contravariant = !contravariant;
                 }
-                else if ((isLiteralType(source) || source.flags & 4) && target.flags & 1048576) {
+                else if ((isLiteralType(source) || source.flags & 4 /* String */) && target.flags & 1048576 /* Index */) {
                     var empty = createEmptyObjectTypeFromStringLiteral(source);
                     contravariant = !contravariant;
                     var savePriority = priority;
-                    priority |= 16;
+                    priority |= 16 /* LiteralKeyof */;
                     inferFromTypes(empty, target.type);
                     priority = savePriority;
                     contravariant = !contravariant;
                 }
-                else if (source.flags & 2097152 && target.flags & 2097152) {
+                else if (source.flags & 2097152 /* IndexedAccess */ && target.flags & 2097152 /* IndexedAccess */) {
                     inferFromTypes(source.objectType, target.objectType);
                     inferFromTypes(source.indexType, target.indexType);
                 }
-                else if (source.flags & 4194304 && target.flags & 4194304) {
+                else if (source.flags & 4194304 /* Conditional */ && target.flags & 4194304 /* Conditional */) {
                     inferFromTypes(source.checkType, target.checkType);
                     inferFromTypes(source.extendsType, target.extendsType);
                     inferFromTypes(getTrueTypeFromConditionalType(source), getTrueTypeFromConditionalType(target));
                     inferFromTypes(getFalseTypeFromConditionalType(source), getFalseTypeFromConditionalType(target));
                 }
-                else if (target.flags & 786432) {
+                else if (target.flags & 786432 /* UnionOrIntersection */) {
                     var targetTypes = target.types;
                     var typeVariableCount = 0;
                     var typeVariable = void 0;
+                    // First infer to each type in union or intersection that isn't a type variable
                     for (var _d = 0, targetTypes_3 = targetTypes; _d < targetTypes_3.length; _d++) {
                         var t = targetTypes_3[_d];
                         if (getInferenceInfoForType(t)) {
@@ -33092,14 +40698,18 @@ var ts;
                             inferFromTypes(source, t);
                         }
                     }
+                    // Next, if target containings a single naked type variable, make a secondary inference to that type
+                    // variable. This gives meaningful results for union types in co-variant positions and intersection
+                    // types in contra-variant positions (such as callback parameters).
                     if (typeVariableCount === 1) {
                         var savePriority = priority;
-                        priority |= 1;
+                        priority |= 1 /* NakedTypeVariable */;
                         inferFromTypes(source, typeVariable);
                         priority = savePriority;
                     }
                 }
-                else if (source.flags & 262144) {
+                else if (source.flags & 262144 /* Union */) {
+                    // Source is a union or intersection type, infer from each constituent type
                     var sourceTypes = source.types;
                     for (var _e = 0, sourceTypes_3 = sourceTypes; _e < sourceTypes_3.length; _e++) {
                         var sourceType = sourceTypes_3[_e];
@@ -33107,17 +40717,21 @@ var ts;
                     }
                 }
                 else {
-                    if (!(priority & 32 && source.flags & (524288 | 15794176))) {
+                    if (!(priority & 32 /* NoConstraints */ && source.flags & (524288 /* Intersection */ | 15794176 /* Instantiable */))) {
                         source = getApparentType(source);
                     }
-                    if (source.flags & (131072 | 524288)) {
+                    if (source.flags & (131072 /* Object */ | 524288 /* Intersection */)) {
                         var key = source.id + "," + target.id;
                         if (visited && visited.get(key)) {
                             return;
                         }
                         (visited || (visited = ts.createMap())).set(key, true);
-                        var isNonConstructorObject = target.flags & 131072 &&
-                            !(ts.getObjectFlags(target) & 16 && target.symbol && target.symbol.flags & 32);
+                        // If we are already processing another target type with the same associated symbol (such as
+                        // an instantiation of the same generic type), we do not explore this target as it would yield
+                        // no further inferences. We exclude the static side of classes from this check since it shares
+                        // its symbol with the instance side which would lead to false positives.
+                        var isNonConstructorObject = target.flags & 131072 /* Object */ &&
+                            !(ts.getObjectFlags(target) & 16 /* Anonymous */ && target.symbol && target.symbol.flags & 32 /* Class */);
                         var symbol = isNonConstructorObject ? target.symbol : undefined;
                         if (symbol) {
                             if (ts.contains(symbolStack, symbol)) {
@@ -33134,7 +40748,7 @@ var ts;
                 }
             }
             function inferFromContravariantTypes(source, target) {
-                if (strictFunctionTypes || priority & 64) {
+                if (strictFunctionTypes || priority & 64 /* AlwaysStrict */) {
                     contravariant = !contravariant;
                     inferFromTypes(source, target);
                     contravariant = !contravariant;
@@ -33144,7 +40758,7 @@ var ts;
                 }
             }
             function getInferenceInfoForType(type) {
-                if (type.flags & 2162688) {
+                if (type.flags & 2162688 /* TypeVariable */) {
                     for (var _i = 0, inferences_1 = inferences; _i < inferences_1.length; _i++) {
                         var inference = inferences_1[_i];
                         if (type === inference.typeParameter) {
@@ -33156,37 +40770,46 @@ var ts;
             }
             function inferFromObjectTypes(source, target) {
                 if (isGenericMappedType(source) && isGenericMappedType(target)) {
+                    // The source and target types are generic types { [P in S]: X } and { [P in T]: Y }, so we infer
+                    // from S to T and from X to Y.
                     inferFromTypes(getConstraintTypeFromMappedType(source), getConstraintTypeFromMappedType(target));
                     inferFromTypes(getTemplateTypeFromMappedType(source), getTemplateTypeFromMappedType(target));
                 }
-                if (ts.getObjectFlags(target) & 32) {
+                if (ts.getObjectFlags(target) & 32 /* Mapped */) {
                     var constraintType = getConstraintTypeFromMappedType(target);
-                    if (constraintType.flags & 1048576) {
+                    if (constraintType.flags & 1048576 /* Index */) {
+                        // We're inferring from some source type S to a homomorphic mapped type { [P in keyof T]: X },
+                        // where T is a type variable. Use inferTypeForHomomorphicMappedType to infer a suitable source
+                        // type and then make a secondary inference from that type to T. We make a secondary inference
+                        // such that direct inferences to T get priority over inferences to Partial<T>, for example.
                         var inference = getInferenceInfoForType(constraintType.type);
                         if (inference && !inference.isFixed) {
                             var inferredType = inferTypeForHomomorphicMappedType(source, target);
                             if (inferredType) {
                                 var savePriority = priority;
-                                priority |= 2;
+                                priority |= 2 /* HomomorphicMappedType */;
                                 inferFromTypes(inferredType, inference.typeParameter);
                                 priority = savePriority;
                             }
                         }
                         return;
                     }
-                    if (constraintType.flags & 65536) {
+                    if (constraintType.flags & 65536 /* TypeParameter */) {
+                        // We're inferring from some source type S to a mapped type { [P in T]: X }, where T is a type
+                        // parameter. Infer from 'keyof S' to T and infer from a union of each property type in S to X.
                         var savePriority = priority;
-                        priority |= 4;
+                        priority |= 4 /* MappedTypeConstraint */;
                         inferFromTypes(getIndexType(source), constraintType);
                         priority = savePriority;
                         inferFromTypes(getUnionType(ts.map(getPropertiesOfType(source), getTypeOfSymbol)), getTemplateTypeFromMappedType(target));
                         return;
                     }
                 }
+                // Infer from the members of source and target only if the two types are possibly related
                 if (!typesDefinitelyUnrelated(source, target)) {
                     inferFromProperties(source, target);
-                    inferFromSignatures(source, target, 0);
-                    inferFromSignatures(source, target, 1);
+                    inferFromSignatures(source, target, 0 /* Call */);
+                    inferFromSignatures(source, target, 1 /* Construct */);
                     inferFromIndexTypes(source, target);
                 }
             }
@@ -33222,19 +40845,19 @@ var ts;
                 }
             }
             function inferFromIndexTypes(source, target) {
-                var targetStringIndexType = getIndexTypeOfType(target, 0);
+                var targetStringIndexType = getIndexTypeOfType(target, 0 /* String */);
                 if (targetStringIndexType) {
-                    var sourceIndexType = getIndexTypeOfType(source, 0) ||
-                        getImplicitIndexTypeOfType(source, 0);
+                    var sourceIndexType = getIndexTypeOfType(source, 0 /* String */) ||
+                        getImplicitIndexTypeOfType(source, 0 /* String */);
                     if (sourceIndexType) {
                         inferFromTypes(sourceIndexType, targetStringIndexType);
                     }
                 }
-                var targetNumberIndexType = getIndexTypeOfType(target, 1);
+                var targetNumberIndexType = getIndexTypeOfType(target, 1 /* Number */);
                 if (targetNumberIndexType) {
-                    var sourceIndexType = getIndexTypeOfType(source, 1) ||
-                        getIndexTypeOfType(source, 0) ||
-                        getImplicitIndexTypeOfType(source, 1);
+                    var sourceIndexType = getIndexTypeOfType(source, 1 /* Number */) ||
+                        getIndexTypeOfType(source, 0 /* String */) ||
+                        getImplicitIndexTypeOfType(source, 1 /* Number */);
                     if (sourceIndexType) {
                         inferFromTypes(sourceIndexType, targetNumberIndexType);
                     }
@@ -33250,6 +40873,10 @@ var ts;
             }
             return false;
         }
+        /**
+         * Return a new union or intersection type computed by removing a given set of types
+         * from a given union or intersection type.
+         */
         function removeTypesFromUnionOrIntersection(type, typesToRemove) {
             var reducedTypes = [];
             for (var _i = 0, _a = type.types; _i < _a.length; _i++) {
@@ -33258,38 +40885,46 @@ var ts;
                     reducedTypes.push(t);
                 }
             }
-            return type.flags & 262144 ? getUnionType(reducedTypes) : getIntersectionType(reducedTypes);
+            return type.flags & 262144 /* Union */ ? getUnionType(reducedTypes) : getIntersectionType(reducedTypes);
         }
         function hasPrimitiveConstraint(type) {
             var constraint = getConstraintOfTypeParameter(type);
-            return !!constraint && maybeTypeOfKind(constraint, 32764 | 1048576);
+            return !!constraint && maybeTypeOfKind(constraint, 32764 /* Primitive */ | 1048576 /* Index */);
         }
         function isObjectLiteralType(type) {
-            return !!(ts.getObjectFlags(type) & 128);
+            return !!(ts.getObjectFlags(type) & 128 /* ObjectLiteral */);
         }
         function widenObjectLiteralCandidates(candidates) {
             if (candidates.length > 1) {
                 var objectLiterals = ts.filter(candidates, isObjectLiteralType);
                 if (objectLiterals.length) {
-                    var objectLiteralsType = getWidenedType(getUnionType(objectLiterals, 2));
+                    var objectLiteralsType = getWidenedType(getUnionType(objectLiterals, 2 /* Subtype */));
                     return ts.concatenate(ts.filter(candidates, function (t) { return !isObjectLiteralType(t); }), [objectLiteralsType]);
                 }
             }
             return candidates;
         }
         function getContravariantInference(inference) {
-            return inference.priority & 28 ? getIntersectionType(inference.contraCandidates) : getCommonSubtype(inference.contraCandidates);
+            return inference.priority & 28 /* PriorityImpliesCombination */ ? getIntersectionType(inference.contraCandidates) : getCommonSubtype(inference.contraCandidates);
         }
         function getCovariantInference(inference, context, signature) {
+            // Extract all object literal types and replace them with a single widened and normalized type.
             var candidates = widenObjectLiteralCandidates(inference.candidates);
+            // We widen inferred literal types if
+            // all inferences were made to top-level occurrences of the type parameter, and
+            // the type parameter has no constraint or its constraint includes no primitive or literal types, and
+            // the type parameter was fixed during inference or does not occur at top-level in the return type.
             var primitiveConstraint = hasPrimitiveConstraint(inference.typeParameter);
             var widenLiteralTypes = !primitiveConstraint && inference.topLevel &&
                 (inference.isFixed || !isTypeParameterAtTopLevel(getReturnTypeOfSignature(signature), inference.typeParameter));
             var baseCandidates = primitiveConstraint ? ts.sameMap(candidates, getRegularTypeOfLiteralType) :
                 widenLiteralTypes ? ts.sameMap(candidates, getWidenedLiteralType) :
                     candidates;
-            var unwidenedType = context.flags & 1 || inference.priority & 28 ?
-                getUnionType(baseCandidates, 2) :
+            // If all inferences were made from contravariant positions, infer a common subtype. Otherwise, if
+            // union types were requested or if all inferences were made from the return type position, infer a
+            // union type. Otherwise, infer a common supertype.
+            var unwidenedType = context.flags & 1 /* InferUnionTypes */ || inference.priority & 28 /* PriorityImpliesCombination */ ?
+                getUnionType(baseCandidates, 2 /* Subtype */) :
                 getCommonSupertype(baseCandidates);
             return getWidenedType(unwidenedType);
         }
@@ -33301,23 +40936,34 @@ var ts;
                 if (signature) {
                     if (inference.candidates) {
                         inferredType = getCovariantInference(inference, context, signature);
-                        if (inferredType.flags & 32768 && inference.contraCandidates) {
+                        // If we have inferred 'never' but have contravariant candidates. To get a more specific type we
+                        // infer from the contravariant candidates instead.
+                        if (inferredType.flags & 32768 /* Never */ && inference.contraCandidates) {
                             inferredType = getContravariantInference(inference);
                         }
                     }
                     else if (inference.contraCandidates) {
+                        // We only have contravariant inferences, infer the best common subtype of those
                         inferredType = getContravariantInference(inference);
                     }
-                    else if (context.flags & 2) {
+                    else if (context.flags & 2 /* NoDefault */) {
+                        // We use silentNeverType as the wildcard that signals no inferences.
                         inferredType = silentNeverType;
                     }
                     else {
+                        // Infer either the default or the empty object type when no inferences were
+                        // made. It is important to remember that in this case, inference still
+                        // succeeds, meaning there is no error for not having inference candidates. An
+                        // inference error only occurs when there are *conflicting* candidates, i.e.
+                        // candidates with no common supertype.
                         var defaultType = getDefaultFromTypeParameter(inference.typeParameter);
                         if (defaultType) {
+                            // Instantiate the default type. Any forward reference to a type
+                            // parameter should be instantiated to the empty object type.
                             inferredType = instantiateType(defaultType, combineTypeMappers(createBackreferenceMapper(context.signature.typeParameters, index), context));
                         }
                         else {
-                            inferredType = getDefaultTypeArgumentType(!!(context.flags & 4));
+                            inferredType = getDefaultTypeArgumentType(!!(context.flags & 4 /* AnyDefault */));
                         }
                     }
                 }
@@ -33345,32 +40991,43 @@ var ts;
             }
             return result;
         }
+        // EXPRESSION TYPE CHECKING
         function getResolvedSymbol(node) {
             var links = getNodeLinks(node);
             if (!links.resolvedSymbol) {
                 links.resolvedSymbol = !ts.nodeIsMissing(node) &&
-                    resolveName(node, node.escapedText, 67216319 | 1048576, ts.Diagnostics.Cannot_find_name_0, node, !ts.isWriteOnlyAccess(node), false, ts.Diagnostics.Cannot_find_name_0_Did_you_mean_1) || unknownSymbol;
+                    resolveName(node, node.escapedText, 67216319 /* Value */ | 1048576 /* ExportValue */, ts.Diagnostics.Cannot_find_name_0, node, !ts.isWriteOnlyAccess(node), 
+                    /*excludeGlobals*/ false, ts.Diagnostics.Cannot_find_name_0_Did_you_mean_1) || unknownSymbol;
             }
             return links.resolvedSymbol;
         }
         function isInTypeQuery(node) {
-            return !!ts.findAncestor(node, function (n) { return n.kind === 165 ? true : n.kind === 71 || n.kind === 146 ? false : "quit"; });
+            // TypeScript 1.0 spec (April 2014): 3.6.3
+            // A type query consists of the keyword typeof followed by an expression.
+            // The expression is restricted to a single identifier or a sequence of identifiers separated by periods
+            return !!ts.findAncestor(node, function (n) { return n.kind === 165 /* TypeQuery */ ? true : n.kind === 71 /* Identifier */ || n.kind === 146 /* QualifiedName */ ? false : "quit"; });
         }
+        // Return the flow cache key for a "dotted name" (i.e. a sequence of identifiers
+        // separated by dots). The key consists of the id of the symbol referenced by the
+        // leftmost identifier followed by zero or more property names separated by dots.
+        // The result is undefined if the reference isn't a dotted name. We prefix nodes
+        // occurring in an apparent type position with '@' because the control flow type
+        // of such nodes may be based on the apparent type instead of the declared type.
         function getFlowCacheKey(node) {
-            if (node.kind === 71) {
+            if (node.kind === 71 /* Identifier */) {
                 var symbol = getResolvedSymbol(node);
                 return symbol !== unknownSymbol ? (isConstraintPosition(node) ? "@" : "") + getSymbolId(symbol) : undefined;
             }
-            if (node.kind === 99) {
+            if (node.kind === 99 /* ThisKeyword */) {
                 return "0";
             }
-            if (node.kind === 185) {
+            if (node.kind === 185 /* PropertyAccessExpression */) {
                 var key = getFlowCacheKey(node.expression);
                 return key && key + "." + ts.idText(node.name);
             }
-            if (node.kind === 182) {
+            if (node.kind === 182 /* BindingElement */) {
                 var container = node.parent.parent;
-                var key = container.kind === 182 ? getFlowCacheKey(container) : (container.initializer && getFlowCacheKey(container.initializer));
+                var key = container.kind === 182 /* BindingElement */ ? getFlowCacheKey(container) : (container.initializer && getFlowCacheKey(container.initializer));
                 var text = getBindingElementNameText(node);
                 var result = key && text && (key + "." + text);
                 return result;
@@ -33379,17 +41036,18 @@ var ts;
         }
         function getBindingElementNameText(element) {
             var parent = element.parent;
-            if (parent.kind === 180) {
+            if (parent.kind === 180 /* ObjectBindingPattern */) {
                 var name = element.propertyName || element.name;
                 switch (name.kind) {
-                    case 71:
+                    case 71 /* Identifier */:
                         return ts.idText(name);
-                    case 147:
+                    case 147 /* ComputedPropertyName */:
                         return ts.isStringOrNumericLiteral(name.expression) ? name.expression.text : undefined;
-                    case 9:
-                    case 8:
+                    case 9 /* StringLiteral */:
+                    case 8 /* NumericLiteral */:
                         return name.text;
                     default:
+                        // Per types, array and object binding patterns remain, however they should never be present if propertyName is not defined
                         ts.Debug.fail("Unexpected name kind for binding element name");
                 }
             }
@@ -33399,28 +41057,28 @@ var ts;
         }
         function isMatchingReference(source, target) {
             switch (source.kind) {
-                case 71:
-                    return target.kind === 71 && getResolvedSymbol(source) === getResolvedSymbol(target) ||
-                        (target.kind === 232 || target.kind === 182) &&
+                case 71 /* Identifier */:
+                    return target.kind === 71 /* Identifier */ && getResolvedSymbol(source) === getResolvedSymbol(target) ||
+                        (target.kind === 232 /* VariableDeclaration */ || target.kind === 182 /* BindingElement */) &&
                             getExportSymbolOfValueSymbolIfExported(getResolvedSymbol(source)) === getSymbolOfNode(target);
-                case 99:
-                    return target.kind === 99;
-                case 97:
-                    return target.kind === 97;
-                case 185:
-                    return target.kind === 185 &&
+                case 99 /* ThisKeyword */:
+                    return target.kind === 99 /* ThisKeyword */;
+                case 97 /* SuperKeyword */:
+                    return target.kind === 97 /* SuperKeyword */;
+                case 185 /* PropertyAccessExpression */:
+                    return target.kind === 185 /* PropertyAccessExpression */ &&
                         source.name.escapedText === target.name.escapedText &&
                         isMatchingReference(source.expression, target.expression);
-                case 182:
-                    if (target.kind !== 185)
+                case 182 /* BindingElement */:
+                    if (target.kind !== 185 /* PropertyAccessExpression */)
                         return false;
                     var t = target;
                     if (t.name.escapedText !== getBindingElementNameText(source))
                         return false;
-                    if (source.parent.parent.kind === 182 && isMatchingReference(source.parent.parent, t.expression)) {
+                    if (source.parent.parent.kind === 182 /* BindingElement */ && isMatchingReference(source.parent.parent, t.expression)) {
                         return true;
                     }
-                    if (source.parent.parent.kind === 232) {
+                    if (source.parent.parent.kind === 232 /* VariableDeclaration */) {
                         var maybeId = source.parent.parent.initializer;
                         return !!maybeId && isMatchingReference(maybeId, t.expression);
                     }
@@ -33428,7 +41086,7 @@ var ts;
             return false;
         }
         function containsMatchingReference(source, target) {
-            while (source.kind === 185) {
+            while (source.kind === 185 /* PropertyAccessExpression */) {
                 source = source.expression;
                 if (isMatchingReference(source, target)) {
                     return true;
@@ -33436,27 +41094,31 @@ var ts;
             }
             return false;
         }
+        // Return true if target is a property access xxx.yyy, source is a property access xxx.zzz, the declared
+        // type of xxx is a union type, and yyy is a property that is possibly a discriminant. We consider a property
+        // a possible discriminant if its type differs in the constituents of containing union type, and if every
+        // choice is a unit type or a union of unit types.
         function containsMatchingReferenceDiscriminant(source, target) {
-            return target.kind === 185 &&
+            return target.kind === 185 /* PropertyAccessExpression */ &&
                 containsMatchingReference(source, target.expression) &&
                 isDiscriminantProperty(getDeclaredTypeOfReference(target.expression), target.name.escapedText);
         }
         function getDeclaredTypeOfReference(expr) {
-            if (expr.kind === 71) {
+            if (expr.kind === 71 /* Identifier */) {
                 return getTypeOfSymbol(getResolvedSymbol(expr));
             }
-            if (expr.kind === 185) {
+            if (expr.kind === 185 /* PropertyAccessExpression */) {
                 var type = getDeclaredTypeOfReference(expr.expression);
                 return type && getTypeOfPropertyOfType(type, expr.name.escapedText);
             }
             return undefined;
         }
         function isDiscriminantProperty(type, name) {
-            if (type && type.flags & 262144) {
+            if (type && type.flags & 262144 /* Union */) {
                 var prop = getUnionOrIntersectionProperty(type, name);
-                if (prop && ts.getCheckFlags(prop) & 2) {
+                if (prop && ts.getCheckFlags(prop) & 2 /* SyntheticProperty */) {
                     if (prop.isDiscriminantProperty === undefined) {
-                        prop.isDiscriminantProperty = !!(prop.checkFlags & 32) && isLiteralType(getTypeOfSymbol(prop));
+                        prop.isDiscriminantProperty = !!(prop.checkFlags & 32 /* HasNonUniformType */) && isLiteralType(getTypeOfSymbol(prop));
                     }
                     return prop.isDiscriminantProperty;
                 }
@@ -33489,7 +41151,7 @@ var ts;
                     }
                 }
             }
-            if (callExpression.expression.kind === 185 &&
+            if (callExpression.expression.kind === 185 /* PropertyAccessExpression */ &&
                 isOrContainsMatchingReference(reference, callExpression.expression.expression)) {
                 return true;
             }
@@ -33503,7 +41165,7 @@ var ts;
             return flow.id;
         }
         function typeMaybeAssignableTo(source, target) {
-            if (!(source.flags & 262144)) {
+            if (!(source.flags & 262144 /* Union */)) {
                 return isTypeAssignableTo(source, target);
             }
             for (var _i = 0, _a = source.types; _i < _a.length; _i++) {
@@ -33514,20 +41176,23 @@ var ts;
             }
             return false;
         }
+        // Remove those constituent types of declaredType to which no constituent type of assignedType is assignable.
+        // For example, when a variable of type number | string | boolean is assigned a value of type number | boolean,
+        // we remove type string.
         function getAssignmentReducedType(declaredType, assignedType) {
             if (declaredType !== assignedType) {
-                if (assignedType.flags & 32768) {
+                if (assignedType.flags & 32768 /* Never */) {
                     return assignedType;
                 }
                 var reducedType = filterType(declaredType, function (t) { return typeMaybeAssignableTo(assignedType, t); });
-                if (!(reducedType.flags & 32768)) {
+                if (!(reducedType.flags & 32768 /* Never */)) {
                     return reducedType;
                 }
             }
             return declaredType;
         }
         function getTypeFactsOfTypes(types) {
-            var result = 0;
+            var result = 0 /* None */;
             for (var _i = 0, types_12 = types; _i < types_12.length; _i++) {
                 var t = types_12[_i];
                 result |= getTypeFacts(t);
@@ -33535,62 +41200,64 @@ var ts;
             return result;
         }
         function isFunctionObjectType(type) {
+            // We do a quick check for a "bind" property before performing the more expensive subtype
+            // check. This gives us a quicker out in the common case where an object type is not a function.
             var resolved = resolveStructuredTypeMembers(type);
             return !!(resolved.callSignatures.length || resolved.constructSignatures.length ||
                 resolved.members.get("bind") && isTypeSubtypeOf(type, globalFunctionType));
         }
         function getTypeFacts(type) {
             var flags = type.flags;
-            if (flags & 4) {
-                return strictNullChecks ? 4079361 : 4194049;
+            if (flags & 4 /* String */) {
+                return strictNullChecks ? 4079361 /* StringStrictFacts */ : 4194049 /* StringFacts */;
             }
-            if (flags & 64) {
+            if (flags & 64 /* StringLiteral */) {
                 var isEmpty = type.value === "";
                 return strictNullChecks ?
-                    isEmpty ? 3030785 : 1982209 :
-                    isEmpty ? 3145473 : 4194049;
+                    isEmpty ? 3030785 /* EmptyStringStrictFacts */ : 1982209 /* NonEmptyStringStrictFacts */ :
+                    isEmpty ? 3145473 /* EmptyStringFacts */ : 4194049 /* NonEmptyStringFacts */;
             }
-            if (flags & (8 | 32)) {
-                return strictNullChecks ? 4079234 : 4193922;
+            if (flags & (8 /* Number */ | 32 /* Enum */)) {
+                return strictNullChecks ? 4079234 /* NumberStrictFacts */ : 4193922 /* NumberFacts */;
             }
-            if (flags & 128) {
+            if (flags & 128 /* NumberLiteral */) {
                 var isZero = type.value === 0;
                 return strictNullChecks ?
-                    isZero ? 3030658 : 1982082 :
-                    isZero ? 3145346 : 4193922;
+                    isZero ? 3030658 /* ZeroStrictFacts */ : 1982082 /* NonZeroStrictFacts */ :
+                    isZero ? 3145346 /* ZeroFacts */ : 4193922 /* NonZeroFacts */;
             }
-            if (flags & 16) {
-                return strictNullChecks ? 4078980 : 4193668;
+            if (flags & 16 /* Boolean */) {
+                return strictNullChecks ? 4078980 /* BooleanStrictFacts */ : 4193668 /* BooleanFacts */;
             }
-            if (flags & 272) {
+            if (flags & 272 /* BooleanLike */) {
                 return strictNullChecks ?
-                    type === falseType ? 3030404 : 1981828 :
-                    type === falseType ? 3145092 : 4193668;
+                    type === falseType ? 3030404 /* FalseStrictFacts */ : 1981828 /* TrueStrictFacts */ :
+                    type === falseType ? 3145092 /* FalseFacts */ : 4193668 /* TrueFacts */;
             }
-            if (flags & 131072) {
+            if (flags & 131072 /* Object */) {
                 return isFunctionObjectType(type) ?
-                    strictNullChecks ? 1970144 : 4181984 :
-                    strictNullChecks ? 1972176 : 4184016;
+                    strictNullChecks ? 1970144 /* FunctionStrictFacts */ : 4181984 /* FunctionFacts */ :
+                    strictNullChecks ? 1972176 /* ObjectStrictFacts */ : 4184016 /* ObjectFacts */;
             }
-            if (flags & (4096 | 8192)) {
-                return 2457472;
+            if (flags & (4096 /* Void */ | 8192 /* Undefined */)) {
+                return 2457472 /* UndefinedFacts */;
             }
-            if (flags & 16384) {
-                return 2340752;
+            if (flags & 16384 /* Null */) {
+                return 2340752 /* NullFacts */;
             }
-            if (flags & 3072) {
-                return strictNullChecks ? 1981320 : 4193160;
+            if (flags & 3072 /* ESSymbolLike */) {
+                return strictNullChecks ? 1981320 /* SymbolStrictFacts */ : 4193160 /* SymbolFacts */;
             }
-            if (flags & 16777216) {
-                return strictNullChecks ? 1972176 : 4184016;
+            if (flags & 16777216 /* NonPrimitive */) {
+                return strictNullChecks ? 1972176 /* ObjectStrictFacts */ : 4184016 /* ObjectFacts */;
             }
-            if (flags & 15794176) {
+            if (flags & 15794176 /* Instantiable */) {
                 return getTypeFacts(getBaseConstraintOfType(type) || emptyObjectType);
             }
-            if (flags & 786432) {
+            if (flags & 786432 /* UnionOrIntersection */) {
                 return getTypeFactsOfTypes(type.types);
             }
-            return 4194303;
+            return 4194303 /* All */;
         }
         function getTypeWithFacts(type, include) {
             return filterType(type, function (t) { return (getTypeFacts(t) & include) !== 0; });
@@ -33598,35 +41265,35 @@ var ts;
         function getTypeWithDefault(type, defaultExpression) {
             if (defaultExpression) {
                 var defaultType = getTypeOfExpression(defaultExpression);
-                return getUnionType([getTypeWithFacts(type, 131072), defaultType]);
+                return getUnionType([getTypeWithFacts(type, 131072 /* NEUndefined */), defaultType]);
             }
             return type;
         }
         function getTypeOfDestructuredProperty(type, name) {
             var text = ts.getTextOfPropertyName(name);
             return getConstraintForLocation(getTypeOfPropertyOfType(type, text), name) ||
-                isNumericLiteralName(text) && getIndexTypeOfType(type, 1) ||
-                getIndexTypeOfType(type, 0) ||
+                isNumericLiteralName(text) && getIndexTypeOfType(type, 1 /* Number */) ||
+                getIndexTypeOfType(type, 0 /* String */) ||
                 errorType;
         }
         function getTypeOfDestructuredArrayElement(type, index) {
             return isTupleLikeType(type) && getTypeOfPropertyOfType(type, "" + index) ||
-                checkIteratedTypeOrElementType(type, undefined, false, false) ||
+                checkIteratedTypeOrElementType(type, /*errorNode*/ undefined, /*allowStringInput*/ false, /*allowAsyncIterables*/ false) ||
                 errorType;
         }
         function getTypeOfDestructuredSpreadExpression(type) {
-            return createArrayType(checkIteratedTypeOrElementType(type, undefined, false, false) || errorType);
+            return createArrayType(checkIteratedTypeOrElementType(type, /*errorNode*/ undefined, /*allowStringInput*/ false, /*allowAsyncIterables*/ false) || errorType);
         }
         function getAssignedTypeOfBinaryExpression(node) {
-            var isDestructuringDefaultAssignment = node.parent.kind === 183 && isDestructuringAssignmentTarget(node.parent) ||
-                node.parent.kind === 270 && isDestructuringAssignmentTarget(node.parent.parent);
+            var isDestructuringDefaultAssignment = node.parent.kind === 183 /* ArrayLiteralExpression */ && isDestructuringAssignmentTarget(node.parent) ||
+                node.parent.kind === 270 /* PropertyAssignment */ && isDestructuringAssignmentTarget(node.parent.parent);
             return isDestructuringDefaultAssignment ?
                 getTypeWithDefault(getAssignedType(node), node.right) :
                 getTypeOfExpression(node.right);
         }
         function isDestructuringAssignmentTarget(parent) {
-            return parent.parent.kind === 200 && parent.parent.left === parent ||
-                parent.parent.kind === 222 && parent.parent.initializer === parent;
+            return parent.parent.kind === 200 /* BinaryExpression */ && parent.parent.left === parent ||
+                parent.parent.kind === 222 /* ForOfStatement */ && parent.parent.initializer === parent;
         }
         function getAssignedTypeOfArrayLiteralElement(node, element) {
             return getTypeOfDestructuredArrayElement(getAssignedType(node), node.elements.indexOf(element));
@@ -33643,21 +41310,21 @@ var ts;
         function getAssignedType(node) {
             var parent = node.parent;
             switch (parent.kind) {
-                case 221:
+                case 221 /* ForInStatement */:
                     return stringType;
-                case 222:
+                case 222 /* ForOfStatement */:
                     return checkRightHandSideOfForOf(parent.expression, parent.awaitModifier) || errorType;
-                case 200:
+                case 200 /* BinaryExpression */:
                     return getAssignedTypeOfBinaryExpression(parent);
-                case 194:
+                case 194 /* DeleteExpression */:
                     return undefinedType;
-                case 183:
+                case 183 /* ArrayLiteralExpression */:
                     return getAssignedTypeOfArrayLiteralElement(parent, node);
-                case 204:
+                case 204 /* SpreadElement */:
                     return getAssignedTypeOfSpreadExpression(parent);
-                case 270:
+                case 270 /* PropertyAssignment */:
                     return getAssignedTypeOfPropertyAssignment(parent);
-                case 271:
+                case 271 /* ShorthandPropertyAssignment */:
                     return getAssignedTypeOfShorthandPropertyAssignment(parent);
             }
             return errorType;
@@ -33665,7 +41332,7 @@ var ts;
         function getInitialTypeOfBindingElement(node) {
             var pattern = node.parent;
             var parentType = getInitialType(pattern.parent);
-            var type = pattern.kind === 180 ?
+            var type = pattern.kind === 180 /* ObjectBindingPattern */ ?
                 getTypeOfDestructuredProperty(parentType, node.propertyName || node.name) :
                 !node.dotDotDotToken ?
                     getTypeOfDestructuredArrayElement(parentType, pattern.elements.indexOf(node)) :
@@ -33673,6 +41340,9 @@ var ts;
             return getTypeWithDefault(type, node.initializer);
         }
         function getTypeOfInitializer(node) {
+            // Return the cached type if one is available. If the type of the variable was inferred
+            // from its initializer, we'll already have cached the type. Otherwise we compute it now
+            // without caching such that transient types are reflected.
             var links = getNodeLinks(node);
             return links.resolvedType || getTypeOfExpression(node);
         }
@@ -33680,39 +41350,39 @@ var ts;
             if (node.initializer) {
                 return getTypeOfInitializer(node.initializer);
             }
-            if (node.parent.parent.kind === 221) {
+            if (node.parent.parent.kind === 221 /* ForInStatement */) {
                 return stringType;
             }
-            if (node.parent.parent.kind === 222) {
+            if (node.parent.parent.kind === 222 /* ForOfStatement */) {
                 return checkRightHandSideOfForOf(node.parent.parent.expression, node.parent.parent.awaitModifier) || errorType;
             }
             return errorType;
         }
         function getInitialType(node) {
-            return node.kind === 232 ?
+            return node.kind === 232 /* VariableDeclaration */ ?
                 getInitialTypeOfVariableDeclaration(node) :
                 getInitialTypeOfBindingElement(node);
         }
         function getInitialOrAssignedType(node) {
-            return node.kind === 232 || node.kind === 182 ?
+            return node.kind === 232 /* VariableDeclaration */ || node.kind === 182 /* BindingElement */ ?
                 getInitialType(node) :
                 getAssignedType(node);
         }
         function isEmptyArrayAssignment(node) {
-            return node.kind === 232 && node.initializer &&
+            return node.kind === 232 /* VariableDeclaration */ && node.initializer &&
                 isEmptyArrayLiteral(node.initializer) ||
-                node.kind !== 182 && node.parent.kind === 200 &&
+                node.kind !== 182 /* BindingElement */ && node.parent.kind === 200 /* BinaryExpression */ &&
                     isEmptyArrayLiteral(node.parent.right);
         }
         function getReferenceCandidate(node) {
             switch (node.kind) {
-                case 191:
+                case 191 /* ParenthesizedExpression */:
                     return getReferenceCandidate(node.expression);
-                case 200:
+                case 200 /* BinaryExpression */:
                     switch (node.operatorToken.kind) {
-                        case 58:
+                        case 58 /* EqualsToken */:
                             return getReferenceCandidate(node.left);
-                        case 26:
+                        case 26 /* CommaToken */:
                             return getReferenceCandidate(node.right);
                     }
             }
@@ -33720,13 +41390,13 @@ var ts;
         }
         function getReferenceRoot(node) {
             var parent = node.parent;
-            return parent.kind === 191 ||
-                parent.kind === 200 && parent.operatorToken.kind === 58 && parent.left === node ||
-                parent.kind === 200 && parent.operatorToken.kind === 26 && parent.right === node ?
+            return parent.kind === 191 /* ParenthesizedExpression */ ||
+                parent.kind === 200 /* BinaryExpression */ && parent.operatorToken.kind === 58 /* EqualsToken */ && parent.left === node ||
+                parent.kind === 200 /* BinaryExpression */ && parent.operatorToken.kind === 26 /* CommaToken */ && parent.right === node ?
                 getReferenceRoot(parent) : node;
         }
         function getTypeOfSwitchClause(clause) {
-            if (clause.kind === 266) {
+            if (clause.kind === 266 /* CaseClause */) {
                 return getRegularTypeOfLiteralType(getTypeOfExpression(clause.expression));
             }
             return neverType;
@@ -33743,13 +41413,13 @@ var ts;
             return links.switchTypes;
         }
         function eachTypeContainedIn(source, types) {
-            return source.flags & 262144 ? !ts.forEach(source.types, function (t) { return !ts.contains(types, t); }) : ts.contains(types, source);
+            return source.flags & 262144 /* Union */ ? !ts.forEach(source.types, function (t) { return !ts.contains(types, t); }) : ts.contains(types, source);
         }
         function isTypeSubsetOf(source, target) {
-            return source === target || target.flags & 262144 && isTypeSubsetOfUnion(source, target);
+            return source === target || target.flags & 262144 /* Union */ && isTypeSubsetOfUnion(source, target);
         }
         function isTypeSubsetOfUnion(source, target) {
-            if (source.flags & 262144) {
+            if (source.flags & 262144 /* Union */) {
                 for (var _i = 0, _a = source.types; _i < _a.length; _i++) {
                     var t = _a[_i];
                     if (!containsType(target.types, t)) {
@@ -33758,27 +41428,27 @@ var ts;
                 }
                 return true;
             }
-            if (source.flags & 512 && getBaseTypeOfEnumLiteralType(source) === target) {
+            if (source.flags & 512 /* EnumLiteral */ && getBaseTypeOfEnumLiteralType(source) === target) {
                 return true;
             }
             return containsType(target.types, source);
         }
         function forEachType(type, f) {
-            return type.flags & 262144 ? ts.forEach(type.types, f) : f(type);
+            return type.flags & 262144 /* Union */ ? ts.forEach(type.types, f) : f(type);
         }
         function filterType(type, f) {
-            if (type.flags & 262144) {
+            if (type.flags & 262144 /* Union */) {
                 var types = type.types;
                 var filtered = ts.filter(types, f);
-                return filtered === types ? type : getUnionTypeFromSortedList(filtered, type.flags & 67108864);
+                return filtered === types ? type : getUnionTypeFromSortedList(filtered, type.flags & 67108864 /* UnionOfUnitTypes */);
             }
             return f(type) ? type : neverType;
         }
         function mapType(type, mapper, noReductions) {
-            if (type.flags & 32768) {
+            if (type.flags & 32768 /* Never */) {
                 return type;
             }
-            if (!(type.flags & 262144)) {
+            if (!(type.flags & 262144 /* Union */)) {
                 return mapper(type);
             }
             var types = type.types;
@@ -33799,17 +41469,20 @@ var ts;
                     }
                 }
             }
-            return mappedTypes ? getUnionType(mappedTypes, noReductions ? 0 : 1) : mappedType;
+            return mappedTypes ? getUnionType(mappedTypes, noReductions ? 0 /* None */ : 1 /* Literal */) : mappedType;
         }
         function extractTypesOfKind(type, kind) {
             return filterType(type, function (t) { return (t.flags & kind) !== 0; });
         }
+        // Return a new type in which occurrences of the string and number primitive types in
+        // typeWithPrimitives have been replaced with occurrences of string literals and numeric
+        // literals in typeWithLiterals, respectively.
         function replacePrimitivesWithLiterals(typeWithPrimitives, typeWithLiterals) {
-            if (isTypeSubsetOf(stringType, typeWithPrimitives) && maybeTypeOfKind(typeWithLiterals, 64) ||
-                isTypeSubsetOf(numberType, typeWithPrimitives) && maybeTypeOfKind(typeWithLiterals, 128)) {
+            if (isTypeSubsetOf(stringType, typeWithPrimitives) && maybeTypeOfKind(typeWithLiterals, 64 /* StringLiteral */) ||
+                isTypeSubsetOf(numberType, typeWithPrimitives) && maybeTypeOfKind(typeWithLiterals, 128 /* NumberLiteral */)) {
                 return mapType(typeWithPrimitives, function (t) {
-                    return t.flags & 4 ? extractTypesOfKind(typeWithLiterals, 4 | 64) :
-                        t.flags & 8 ? extractTypesOfKind(typeWithLiterals, 8 | 128) :
+                    return t.flags & 4 /* String */ ? extractTypesOfKind(typeWithLiterals, 4 /* String */ | 64 /* StringLiteral */) :
+                        t.flags & 8 /* Number */ ? extractTypesOfKind(typeWithLiterals, 8 /* Number */ | 128 /* NumberLiteral */) :
                             t;
                 });
             }
@@ -33824,40 +41497,48 @@ var ts;
         function createFlowType(type, incomplete) {
             return incomplete ? { flags: 0, type: type } : type;
         }
+        // An evolving array type tracks the element types that have so far been seen in an
+        // 'x.push(value)' or 'x[n] = value' operation along the control flow graph. Evolving
+        // array types are ultimately converted into manifest array types (using getFinalArrayType)
+        // and never escape the getFlowTypeOfReference function.
         function createEvolvingArrayType(elementType) {
-            var result = createObjectType(256);
+            var result = createObjectType(256 /* EvolvingArray */);
             result.elementType = elementType;
             return result;
         }
         function getEvolvingArrayType(elementType) {
             return evolvingArrayTypes[elementType.id] || (evolvingArrayTypes[elementType.id] = createEvolvingArrayType(elementType));
         }
+        // When adding evolving array element types we do not perform subtype reduction. Instead,
+        // we defer subtype reduction until the evolving array type is finalized into a manifest
+        // array type.
         function addEvolvingArrayElementType(evolvingArrayType, node) {
             var elementType = getBaseTypeOfLiteralType(getContextFreeTypeOfExpression(node));
             return isTypeSubsetOf(elementType, evolvingArrayType.elementType) ? evolvingArrayType : getEvolvingArrayType(getUnionType([evolvingArrayType.elementType, elementType]));
         }
         function createFinalArrayType(elementType) {
-            return elementType.flags & 32768 ?
+            return elementType.flags & 32768 /* Never */ ?
                 autoArrayType :
-                createArrayType(elementType.flags & 262144 ?
-                    getUnionType(elementType.types, 2) :
+                createArrayType(elementType.flags & 262144 /* Union */ ?
+                    getUnionType(elementType.types, 2 /* Subtype */) :
                     elementType);
         }
+        // We perform subtype reduction upon obtaining the final array type from an evolving array type.
         function getFinalArrayType(evolvingArrayType) {
             return evolvingArrayType.finalArrayType || (evolvingArrayType.finalArrayType = createFinalArrayType(evolvingArrayType.elementType));
         }
         function finalizeEvolvingArrayType(type) {
-            return ts.getObjectFlags(type) & 256 ? getFinalArrayType(type) : type;
+            return ts.getObjectFlags(type) & 256 /* EvolvingArray */ ? getFinalArrayType(type) : type;
         }
         function getElementTypeOfEvolvingArrayType(type) {
-            return ts.getObjectFlags(type) & 256 ? type.elementType : neverType;
+            return ts.getObjectFlags(type) & 256 /* EvolvingArray */ ? type.elementType : neverType;
         }
         function isEvolvingArrayTypeList(types) {
             var hasEvolvingArrayType = false;
             for (var _i = 0, types_14 = types; _i < types_14.length; _i++) {
                 var t = types_14[_i];
-                if (!(t.flags & 32768)) {
-                    if (!(ts.getObjectFlags(t) & 256)) {
+                if (!(t.flags & 32768 /* Never */)) {
+                    if (!(ts.getObjectFlags(t) & 256 /* EvolvingArray */)) {
                         return false;
                     }
                     hasEvolvingArrayType = true;
@@ -33865,23 +41546,28 @@ var ts;
             }
             return hasEvolvingArrayType;
         }
+        // At flow control branch or loop junctions, if the type along every antecedent code path
+        // is an evolving array type, we construct a combined evolving array type. Otherwise we
+        // finalize all evolving array types.
         function getUnionOrEvolvingArrayType(types, subtypeReduction) {
             return isEvolvingArrayTypeList(types) ?
                 getEvolvingArrayType(getUnionType(ts.map(types, getElementTypeOfEvolvingArrayType))) :
                 getUnionType(ts.sameMap(types, finalizeEvolvingArrayType), subtypeReduction);
         }
+        // Return true if the given node is 'x' in an 'x.length', x.push(value)', 'x.unshift(value)' or
+        // 'x[n] = value' operation, where 'n' is an expression of type any, undefined, or a number-like type.
         function isEvolvingArrayOperationTarget(node) {
             var root = getReferenceRoot(node);
             var parent = root.parent;
-            var isLengthPushOrUnshift = parent.kind === 185 && (parent.name.escapedText === "length" ||
-                parent.parent.kind === 187 && ts.isPushOrUnshiftIdentifier(parent.name));
-            var isElementAssignment = parent.kind === 186 &&
+            var isLengthPushOrUnshift = parent.kind === 185 /* PropertyAccessExpression */ && (parent.name.escapedText === "length" ||
+                parent.parent.kind === 187 /* CallExpression */ && ts.isPushOrUnshiftIdentifier(parent.name));
+            var isElementAssignment = parent.kind === 186 /* ElementAccessExpression */ &&
                 parent.expression === root &&
-                parent.parent.kind === 200 &&
-                parent.parent.operatorToken.kind === 58 &&
+                parent.parent.kind === 200 /* BinaryExpression */ &&
+                parent.parent.operatorToken.kind === 58 /* EqualsToken */ &&
                 parent.parent.left === parent &&
                 !ts.isAssignmentTarget(parent.parent) &&
-                isTypeAssignableToKind(getTypeOfExpression(parent.argumentExpression), 168);
+                isTypeAssignableToKind(getTypeOfExpression(parent.argumentExpression), 168 /* NumberLike */);
             return isLengthPushOrUnshift || isElementAssignment;
         }
         function maybeTypePredicateCall(node) {
@@ -33892,11 +41578,11 @@ var ts;
             return links.maybeTypePredicate;
         }
         function getMaybeTypePredicate(node) {
-            if (node.expression.kind !== 97) {
+            if (node.expression.kind !== 97 /* SuperKeyword */) {
                 var funcType = checkNonNullExpression(node.expression);
                 if (funcType !== silentNeverType) {
                     var apparentType = getApparentType(funcType);
-                    return apparentType !== errorType && ts.some(getSignaturesOfType(apparentType, 0), signatureHasTypePredicate);
+                    return apparentType !== errorType && ts.some(getSignaturesOfType(apparentType, 0 /* Call */), signatureHasTypePredicate);
                 }
             }
             return false;
@@ -33914,19 +41600,25 @@ var ts;
             if (flowAnalysisDisabled) {
                 return errorType;
             }
-            if (!reference.flowNode || !couldBeUninitialized && !(declaredType.flags & 33492479)) {
+            if (!reference.flowNode || !couldBeUninitialized && !(declaredType.flags & 33492479 /* Narrowable */)) {
                 return declaredType;
             }
             var sharedFlowStart = sharedFlowCount;
             var evolvedType = getTypeFromFlowType(getTypeAtFlowNode(reference.flowNode));
             sharedFlowCount = sharedFlowStart;
-            var resultType = ts.getObjectFlags(evolvedType) & 256 && isEvolvingArrayOperationTarget(reference) ? anyArrayType : finalizeEvolvingArrayType(evolvedType);
-            if (reference.parent && reference.parent.kind === 209 && getTypeWithFacts(resultType, 524288).flags & 32768) {
+            // When the reference is 'x' in an 'x.length', 'x.push(value)', 'x.unshift(value)' or x[n] = value' operation,
+            // we give type 'any[]' to 'x' instead of using the type determined by control flow analysis such that operations
+            // on empty arrays are possible without implicit any errors and new element types can be inferred without
+            // type mismatch errors.
+            var resultType = ts.getObjectFlags(evolvedType) & 256 /* EvolvingArray */ && isEvolvingArrayOperationTarget(reference) ? anyArrayType : finalizeEvolvingArrayType(evolvedType);
+            if (reference.parent && reference.parent.kind === 209 /* NonNullExpression */ && getTypeWithFacts(resultType, 524288 /* NEUndefinedOrNull */).flags & 32768 /* Never */) {
                 return declaredType;
             }
             return resultType;
             function getTypeAtFlowNode(flow) {
                 if (flowDepth === 2500) {
+                    // We have made 2500 recursive invocations. To avoid overflowing the call stack we report an error
+                    // and disable further control flow analysis in the containing function or module body.
                     flowAnalysisDisabled = true;
                     reportFlowControlError(reference);
                     return errorType;
@@ -33934,7 +41626,10 @@ var ts;
                 flowDepth++;
                 while (true) {
                     var flags = flow.flags;
-                    if (flags & 1024) {
+                    if (flags & 1024 /* Shared */) {
+                        // We cache results of flow type resolution for shared nodes that were previously visited in
+                        // the same getFlowTypeOfReference invocation. A node is considered shared when it is the
+                        // antecedent of more than one node.
                         for (var i = sharedFlowStart; i < sharedFlowCount; i++) {
                             if (sharedFlowNodes[i] === flow) {
                                 flowDepth--;
@@ -33943,56 +41638,64 @@ var ts;
                         }
                     }
                     var type = void 0;
-                    if (flags & 4096) {
+                    if (flags & 4096 /* AfterFinally */) {
+                        // block flow edge: finally -> pre-try (for larger explanation check comment in binder.ts - bindTryStatement
                         flow.locked = true;
                         type = getTypeAtFlowNode(flow.antecedent);
                         flow.locked = false;
                     }
-                    else if (flags & 2048) {
+                    else if (flags & 2048 /* PreFinally */) {
+                        // locked pre-finally flows are filtered out in getTypeAtFlowBranchLabel
+                        // so here just redirect to antecedent
                         flow = flow.antecedent;
                         continue;
                     }
-                    else if (flags & 16) {
+                    else if (flags & 16 /* Assignment */) {
                         type = getTypeAtFlowAssignment(flow);
                         if (!type) {
                             flow = flow.antecedent;
                             continue;
                         }
                     }
-                    else if (flags & 96) {
+                    else if (flags & 96 /* Condition */) {
                         type = getTypeAtFlowCondition(flow);
                     }
-                    else if (flags & 128) {
+                    else if (flags & 128 /* SwitchClause */) {
                         type = getTypeAtSwitchClause(flow);
                     }
-                    else if (flags & 12) {
+                    else if (flags & 12 /* Label */) {
                         if (flow.antecedents.length === 1) {
                             flow = flow.antecedents[0];
                             continue;
                         }
-                        type = flags & 4 ?
+                        type = flags & 4 /* BranchLabel */ ?
                             getTypeAtFlowBranchLabel(flow) :
                             getTypeAtFlowLoopLabel(flow);
                     }
-                    else if (flags & 256) {
+                    else if (flags & 256 /* ArrayMutation */) {
                         type = getTypeAtFlowArrayMutation(flow);
                         if (!type) {
                             flow = flow.antecedent;
                             continue;
                         }
                     }
-                    else if (flags & 2) {
+                    else if (flags & 2 /* Start */) {
+                        // Check if we should continue with the control flow of the containing function.
                         var container = flow.container;
-                        if (container && container !== flowContainer && reference.kind !== 185 && reference.kind !== 99) {
+                        if (container && container !== flowContainer && reference.kind !== 185 /* PropertyAccessExpression */ && reference.kind !== 99 /* ThisKeyword */) {
                             flow = container.flowNode;
                             continue;
                         }
+                        // At the top of the flow we have the initial type.
                         type = initialType;
                     }
                     else {
+                        // Unreachable code errors are reported in the binding phase. Here we
+                        // simply return the non-auto declared type to reduce follow-on errors.
                         type = convertAutoToAny(declaredType);
                     }
-                    if (flags & 1024) {
+                    if (flags & 1024 /* Shared */) {
+                        // Record visited node and the associated type in the cache.
                         sharedFlowNodes[sharedFlowCount] = flow;
                         sharedFlowTypes[sharedFlowCount] = type;
                         sharedFlowCount++;
@@ -34003,8 +41706,10 @@ var ts;
             }
             function getTypeAtFlowAssignment(flow) {
                 var node = flow.node;
+                // Assignments only narrow the computed type if the declared type is a union type. Thus, we
+                // only need to evaluate the assigned type if the declared type is a union type.
                 if (isMatchingReference(reference, node)) {
-                    if (ts.getAssignmentTargetKind(node) === 2) {
+                    if (ts.getAssignmentTargetKind(node) === 2 /* Compound */) {
                         var flowType = getTypeAtFlowNode(flow.antecedent);
                         return createFlowType(getBaseTypeOfLiteralType(getTypeFromFlowType(flowType)), isIncomplete(flowType));
                     }
@@ -34015,28 +41720,33 @@ var ts;
                         var assignedType = getBaseTypeOfLiteralType(getInitialOrAssignedType(node));
                         return isTypeAssignableTo(assignedType, declaredType) ? assignedType : anyArrayType;
                     }
-                    if (declaredType.flags & 262144) {
+                    if (declaredType.flags & 262144 /* Union */) {
                         return getAssignmentReducedType(declaredType, getInitialOrAssignedType(node));
                     }
                     return declaredType;
                 }
+                // We didn't have a direct match. However, if the reference is a dotted name, this
+                // may be an assignment to a left hand part of the reference. For example, for a
+                // reference 'x.y.z', we may be at an assignment to 'x.y' or 'x'. In that case,
+                // return the declared type.
                 if (containsMatchingReference(reference, node)) {
                     return declaredType;
                 }
+                // Assignment doesn't affect reference
                 return undefined;
             }
             function getTypeAtFlowArrayMutation(flow) {
                 if (declaredType === autoType || declaredType === autoArrayType) {
                     var node = flow.node;
-                    var expr = node.kind === 187 ?
+                    var expr = node.kind === 187 /* CallExpression */ ?
                         node.expression.expression :
                         node.left.expression;
                     if (isMatchingReference(reference, getReferenceCandidate(expr))) {
                         var flowType = getTypeAtFlowNode(flow.antecedent);
                         var type = getTypeFromFlowType(flowType);
-                        if (ts.getObjectFlags(type) & 256) {
+                        if (ts.getObjectFlags(type) & 256 /* EvolvingArray */) {
                             var evolvedType_1 = type;
-                            if (node.kind === 187) {
+                            if (node.kind === 187 /* CallExpression */) {
                                 for (var _i = 0, _a = node.arguments; _i < _a.length; _i++) {
                                     var arg = _a[_i];
                                     evolvedType_1 = addEvolvingArrayElementType(evolvedType_1, arg);
@@ -34044,7 +41754,7 @@ var ts;
                             }
                             else {
                                 var indexType = getTypeOfExpression(node.left.argumentExpression);
-                                if (isTypeAssignableToKind(indexType, 168)) {
+                                if (isTypeAssignableToKind(indexType, 168 /* NumberLike */)) {
                                     evolvedType_1 = addEvolvingArrayElementType(evolvedType_1, node.right);
                                 }
                             }
@@ -34058,17 +41768,24 @@ var ts;
             function getTypeAtFlowCondition(flow) {
                 var flowType = getTypeAtFlowNode(flow.antecedent);
                 var type = getTypeFromFlowType(flowType);
-                if (type.flags & 32768) {
+                if (type.flags & 32768 /* Never */) {
                     return flowType;
                 }
-                var assumeTrue = (flow.flags & 32) !== 0;
+                // If we have an antecedent type (meaning we're reachable in some way), we first
+                // attempt to narrow the antecedent type. If that produces the never type, and if
+                // the antecedent type is incomplete (i.e. a transient type in a loop), then we
+                // take the type guard as an indication that control *could* reach here once we
+                // have the complete type. We proceed by switching to the silent never type which
+                // doesn't report errors when operators are applied to it. Note that this is the
+                // *only* place a silent never type is ever generated.
+                var assumeTrue = (flow.flags & 32 /* TrueCondition */) !== 0;
                 var nonEvolvingType = finalizeEvolvingArrayType(type);
                 var narrowedType = narrowType(nonEvolvingType, flow.expression, assumeTrue);
                 if (narrowedType === nonEvolvingType) {
                     return flowType;
                 }
                 var incomplete = isIncomplete(flowType);
-                var resultType = incomplete && narrowedType.flags & 32768 ? silentNeverType : narrowedType;
+                var resultType = incomplete && narrowedType.flags & 32768 /* Never */ ? silentNeverType : narrowedType;
                 return createFlowType(resultType, incomplete);
             }
             function getTypeAtSwitchClause(flow) {
@@ -34089,15 +41806,25 @@ var ts;
                 var seenIncomplete = false;
                 for (var _i = 0, _a = flow.antecedents; _i < _a.length; _i++) {
                     var antecedent = _a[_i];
-                    if (antecedent.flags & 2048 && antecedent.lock.locked) {
+                    if (antecedent.flags & 2048 /* PreFinally */ && antecedent.lock.locked) {
+                        // if flow correspond to branch from pre-try to finally and this branch is locked - this means that
+                        // we initially have started following the flow outside the finally block.
+                        // in this case we should ignore this branch.
                         continue;
                     }
                     var flowType = getTypeAtFlowNode(antecedent);
                     var type = getTypeFromFlowType(flowType);
+                    // If the type at a particular antecedent path is the declared type and the
+                    // reference is known to always be assigned (i.e. when declared and initial types
+                    // are the same), there is no reason to process more antecedents since the only
+                    // possible outcome is subtypes that will be removed in the final union type anyway.
                     if (type === declaredType && declaredType === initialType) {
                         return type;
                     }
                     ts.pushIfUnique(antecedentTypes, type);
+                    // If an antecedent type is not a subset of the declared type, we need to perform
+                    // subtype reduction. This happens when a "foreign" type is injected into the control
+                    // flow using the instanceof operator or a user defined type predicate.
                     if (!isTypeSubsetOf(type, declaredType)) {
                         subtypeReduction = true;
                     }
@@ -34105,13 +41832,16 @@ var ts;
                         seenIncomplete = true;
                     }
                 }
-                return createFlowType(getUnionOrEvolvingArrayType(antecedentTypes, subtypeReduction ? 2 : 1), seenIncomplete);
+                return createFlowType(getUnionOrEvolvingArrayType(antecedentTypes, subtypeReduction ? 2 /* Subtype */ : 1 /* Literal */), seenIncomplete);
             }
             function getTypeAtFlowLoopLabel(flow) {
+                // If we have previously computed the control flow type for the reference at
+                // this flow loop junction, return the cached type.
                 var id = getFlowNodeId(flow);
                 var cache = flowLoopCaches[id] || (flowLoopCaches[id] = ts.createMap());
                 if (!key) {
                     key = getFlowCacheKey(reference);
+                    // No cache key is generated when binding patterns are in unnarrowable situations
                     if (!key) {
                         return declaredType;
                     }
@@ -34120,11 +41850,21 @@ var ts;
                 if (cached) {
                     return cached;
                 }
+                // If this flow loop junction and reference are already being processed, return
+                // the union of the types computed for each branch so far, marked as incomplete.
+                // It is possible to see an empty array in cases where loops are nested and the
+                // back edge of the outer loop reaches an inner loop that is already being analyzed.
+                // In such cases we restart the analysis of the inner loop, which will then see
+                // a non-empty in-process array for the outer loop and eventually terminate because
+                // the first antecedent of a loop junction is always the non-looping control flow
+                // path that leads to the top.
                 for (var i = flowLoopStart; i < flowLoopCount; i++) {
                     if (flowLoopNodes[i] === flow && flowLoopKeys[i] === key && flowLoopTypes[i].length) {
-                        return createFlowType(getUnionOrEvolvingArrayType(flowLoopTypes[i], 1), true);
+                        return createFlowType(getUnionOrEvolvingArrayType(flowLoopTypes[i], 1 /* Literal */), /*incomplete*/ true);
                     }
                 }
+                // Add the flow loop junction and reference to the in-process stack and analyze
+                // each antecedent code path.
                 var antecedentTypes = [];
                 var subtypeReduction = false;
                 var firstAntecedentType;
@@ -34140,28 +41880,39 @@ var ts;
                         firstAntecedentType = flowType;
                     }
                     var type = getTypeFromFlowType(flowType);
+                    // If we see a value appear in the cache it is a sign that control flow analysis
+                    // was restarted and completed by checkExpressionCached. We can simply pick up
+                    // the resulting type and bail out.
                     var cached_1 = cache.get(key);
                     if (cached_1) {
                         return cached_1;
                     }
                     ts.pushIfUnique(antecedentTypes, type);
+                    // If an antecedent type is not a subset of the declared type, we need to perform
+                    // subtype reduction. This happens when a "foreign" type is injected into the control
+                    // flow using the instanceof operator or a user defined type predicate.
                     if (!isTypeSubsetOf(type, declaredType)) {
                         subtypeReduction = true;
                     }
+                    // If the type at a particular antecedent path is the declared type there is no
+                    // reason to process more antecedents since the only possible outcome is subtypes
+                    // that will be removed in the final union type anyway.
                     if (type === declaredType) {
                         break;
                     }
                 }
-                var result = getUnionOrEvolvingArrayType(antecedentTypes, subtypeReduction ? 2 : 1);
+                // The result is incomplete if the first antecedent (the non-looping control flow path)
+                // is incomplete.
+                var result = getUnionOrEvolvingArrayType(antecedentTypes, subtypeReduction ? 2 /* Subtype */ : 1 /* Literal */);
                 if (isIncomplete(firstAntecedentType)) {
-                    return createFlowType(result, true);
+                    return createFlowType(result, /*incomplete*/ true);
                 }
                 cache.set(key, result);
                 return result;
             }
             function isMatchingReferenceDiscriminant(expr, computedType) {
-                return expr.kind === 185 &&
-                    computedType.flags & 262144 &&
+                return expr.kind === 185 /* PropertyAccessExpression */ &&
+                    computedType.flags & 262144 /* Union */ &&
                     isMatchingReference(reference, expr.expression) &&
                     isDiscriminantProperty(computedType, expr.name.escapedText);
             }
@@ -34173,10 +41924,10 @@ var ts;
             }
             function narrowTypeByTruthiness(type, expr, assumeTrue) {
                 if (isMatchingReference(reference, expr)) {
-                    return getTypeWithFacts(type, assumeTrue ? 1048576 : 2097152);
+                    return getTypeWithFacts(type, assumeTrue ? 1048576 /* Truthy */ : 2097152 /* Falsy */);
                 }
                 if (isMatchingReferenceDiscriminant(expr, declaredType)) {
-                    return narrowTypeByDiscriminant(type, expr, function (t) { return getTypeWithFacts(t, assumeTrue ? 1048576 : 2097152); });
+                    return narrowTypeByDiscriminant(type, expr, function (t) { return getTypeWithFacts(t, assumeTrue ? 1048576 /* Truthy */ : 2097152 /* Falsy */); });
                 }
                 if (containsMatchingReferenceDiscriminant(reference, expr)) {
                     return declaredType;
@@ -34184,17 +41935,17 @@ var ts;
                 return type;
             }
             function isTypePresencePossible(type, propName, assumeTrue) {
-                if (getIndexInfoOfType(type, 0)) {
+                if (getIndexInfoOfType(type, 0 /* String */)) {
                     return true;
                 }
                 var prop = getPropertyOfType(type, propName);
                 if (prop) {
-                    return prop.flags & 16777216 ? true : assumeTrue;
+                    return prop.flags & 16777216 /* Optional */ ? true : assumeTrue;
                 }
                 return !assumeTrue;
             }
             function narrowByInKeyword(type, literal, assumeTrue) {
-                if ((type.flags & (262144 | 131072)) || (type.flags & 65536 && type.isThisType)) {
+                if ((type.flags & (262144 /* Union */ | 131072 /* Object */)) || (type.flags & 65536 /* TypeParameter */ && type.isThisType)) {
                     var propName_1 = ts.escapeLeadingUnderscores(literal.text);
                     return filterType(type, function (t) { return isTypePresencePossible(t, propName_1, assumeTrue); });
                 }
@@ -34202,19 +41953,19 @@ var ts;
             }
             function narrowTypeByBinaryExpression(type, expr, assumeTrue) {
                 switch (expr.operatorToken.kind) {
-                    case 58:
+                    case 58 /* EqualsToken */:
                         return narrowTypeByTruthiness(type, expr.left, assumeTrue);
-                    case 32:
-                    case 33:
-                    case 34:
-                    case 35:
+                    case 32 /* EqualsEqualsToken */:
+                    case 33 /* ExclamationEqualsToken */:
+                    case 34 /* EqualsEqualsEqualsToken */:
+                    case 35 /* ExclamationEqualsEqualsToken */:
                         var operator_1 = expr.operatorToken.kind;
                         var left_1 = getReferenceCandidate(expr.left);
                         var right_1 = getReferenceCandidate(expr.right);
-                        if (left_1.kind === 195 && ts.isStringLiteralLike(right_1)) {
+                        if (left_1.kind === 195 /* TypeOfExpression */ && ts.isStringLiteralLike(right_1)) {
                             return narrowTypeByTypeof(type, left_1, operator_1, right_1, assumeTrue);
                         }
-                        if (right_1.kind === 195 && ts.isStringLiteralLike(left_1)) {
+                        if (right_1.kind === 195 /* TypeOfExpression */ && ts.isStringLiteralLike(left_1)) {
                             return narrowTypeByTypeof(type, right_1, operator_1, left_1, assumeTrue);
                         }
                         if (isMatchingReference(reference, left_1)) {
@@ -34233,45 +41984,45 @@ var ts;
                             return declaredType;
                         }
                         break;
-                    case 93:
+                    case 93 /* InstanceOfKeyword */:
                         return narrowTypeByInstanceof(type, expr, assumeTrue);
-                    case 92:
+                    case 92 /* InKeyword */:
                         var target = getReferenceCandidate(expr.right);
                         if (ts.isStringLiteralLike(expr.left) && isMatchingReference(reference, target)) {
                             return narrowByInKeyword(type, expr.left, assumeTrue);
                         }
                         break;
-                    case 26:
+                    case 26 /* CommaToken */:
                         return narrowType(type, expr.right, assumeTrue);
                 }
                 return type;
             }
             function narrowTypeByEquality(type, operator, value, assumeTrue) {
-                if (type.flags & 1) {
+                if (type.flags & 1 /* Any */) {
                     return type;
                 }
-                if (operator === 33 || operator === 35) {
+                if (operator === 33 /* ExclamationEqualsToken */ || operator === 35 /* ExclamationEqualsEqualsToken */) {
                     assumeTrue = !assumeTrue;
                 }
                 var valueType = getTypeOfExpression(value);
-                if (valueType.flags & 24576) {
+                if (valueType.flags & 24576 /* Nullable */) {
                     if (!strictNullChecks) {
                         return type;
                     }
-                    var doubleEquals = operator === 32 || operator === 33;
+                    var doubleEquals = operator === 32 /* EqualsEqualsToken */ || operator === 33 /* ExclamationEqualsToken */;
                     var facts = doubleEquals ?
-                        assumeTrue ? 65536 : 524288 :
-                        valueType.flags & 16384 ?
-                            assumeTrue ? 32768 : 262144 :
-                            assumeTrue ? 16384 : 131072;
+                        assumeTrue ? 65536 /* EQUndefinedOrNull */ : 524288 /* NEUndefinedOrNull */ :
+                        valueType.flags & 16384 /* Null */ ?
+                            assumeTrue ? 32768 /* EQNull */ : 262144 /* NENull */ :
+                            assumeTrue ? 16384 /* EQUndefined */ : 131072 /* NEUndefined */;
                     return getTypeWithFacts(type, facts);
                 }
-                if (type.flags & 16909315) {
+                if (type.flags & 16909315 /* NotUnionOrUnit */) {
                     return type;
                 }
                 if (assumeTrue) {
                     var narrowedType = filterType(type, function (t) { return areTypesComparable(t, valueType); });
-                    return narrowedType.flags & 32768 ? type : replacePrimitivesWithLiterals(narrowedType, valueType);
+                    return narrowedType.flags & 32768 /* Never */ ? type : replacePrimitivesWithLiterals(narrowedType, valueType);
                 }
                 if (isUnitType(valueType)) {
                     var regularType_1 = getRegularTypeOfLiteralType(valueType);
@@ -34280,26 +42031,32 @@ var ts;
                 return type;
             }
             function narrowTypeByTypeof(type, typeOfExpr, operator, literal, assumeTrue) {
+                // We have '==', '!=', '====', or !==' operator with 'typeof xxx' and string literal operands
                 var target = getReferenceCandidate(typeOfExpr.expression);
                 if (!isMatchingReference(reference, target)) {
+                    // For a reference of the form 'x.y', a 'typeof x === ...' type guard resets the
+                    // narrowed type of 'y' to its declared type.
                     if (containsMatchingReference(reference, target)) {
                         return declaredType;
                     }
                     return type;
                 }
-                if (operator === 33 || operator === 35) {
+                if (operator === 33 /* ExclamationEqualsToken */ || operator === 35 /* ExclamationEqualsEqualsToken */) {
                     assumeTrue = !assumeTrue;
                 }
-                if (type.flags & 1 && literal.text === "function") {
+                if (type.flags & 1 /* Any */ && literal.text === "function") {
                     return type;
                 }
-                if (assumeTrue && !(type.flags & 262144)) {
+                if (assumeTrue && !(type.flags & 262144 /* Union */)) {
+                    // We narrow a non-union type to an exact primitive type if the non-union type
+                    // is a supertype of that primitive type. For example, type 'any' can be narrowed
+                    // to one of the primitive types.
                     var targetType = literal.text === "function" ? globalFunctionType : typeofTypesByName.get(literal.text);
                     if (targetType) {
                         if (isTypeSubtypeOf(targetType, type)) {
                             return targetType;
                         }
-                        if (type.flags & 15794176) {
+                        if (type.flags & 15794176 /* Instantiable */) {
                             var constraint = getBaseConstraintOfType(type) || anyType;
                             if (isTypeSubtypeOf(targetType, constraint)) {
                                 return getIntersectionType([type, targetType]);
@@ -34308,11 +42065,12 @@ var ts;
                     }
                 }
                 var facts = assumeTrue ?
-                    typeofEQFacts.get(literal.text) || 64 :
-                    typeofNEFacts.get(literal.text) || 8192;
+                    typeofEQFacts.get(literal.text) || 64 /* TypeofEQHostObject */ :
+                    typeofNEFacts.get(literal.text) || 8192 /* TypeofNEHostObject */;
                 return getTypeWithFacts(type, facts);
             }
             function narrowTypeBySwitchOnDiscriminant(type, switchStatement, clauseStart, clauseEnd) {
+                // We only narrow if all case expressions specify values with unit types
                 var switchTypes = getSwitchClauseTypes(switchStatement);
                 if (!switchTypes.length) {
                     return type;
@@ -34320,22 +42078,25 @@ var ts;
                 var clauseTypes = switchTypes.slice(clauseStart, clauseEnd);
                 var hasDefaultClause = clauseStart === clauseEnd || ts.contains(clauseTypes, neverType);
                 var discriminantType = getUnionType(clauseTypes);
-                var caseType = discriminantType.flags & 32768 ? neverType :
+                var caseType = discriminantType.flags & 32768 /* Never */ ? neverType :
                     replacePrimitivesWithLiterals(filterType(type, function (t) { return areTypesComparable(discriminantType, t); }), discriminantType);
                 if (!hasDefaultClause) {
                     return caseType;
                 }
                 var defaultType = filterType(type, function (t) { return !(isUnitType(t) && ts.contains(switchTypes, getRegularTypeOfLiteralType(t))); });
-                return caseType.flags & 32768 ? defaultType : getUnionType([caseType, defaultType]);
+                return caseType.flags & 32768 /* Never */ ? defaultType : getUnionType([caseType, defaultType]);
             }
             function narrowTypeByInstanceof(type, expr, assumeTrue) {
                 var left = getReferenceCandidate(expr.left);
                 if (!isMatchingReference(reference, left)) {
+                    // For a reference of the form 'x.y', an 'x instanceof T' type guard resets the
+                    // narrowed type of 'y' to its declared type.
                     if (containsMatchingReference(reference, left)) {
                         return declaredType;
                     }
                     return type;
                 }
+                // Check that right operand is a function type with a prototype property
                 var rightType = getTypeOfExpression(expr.right);
                 if (!isTypeSubtypeOf(rightType, globalFunctionType)) {
                     return type;
@@ -34343,21 +42104,24 @@ var ts;
                 var targetType;
                 var prototypeProperty = getPropertyOfType(rightType, "prototype");
                 if (prototypeProperty) {
+                    // Target type is type of the prototype property
                     var prototypePropertyType = getTypeOfSymbol(prototypeProperty);
                     if (!isTypeAny(prototypePropertyType)) {
                         targetType = prototypePropertyType;
                     }
                 }
+                // Don't narrow from 'any' if the target type is exactly 'Object' or 'Function'
                 if (isTypeAny(type) && (targetType === globalObjectType || targetType === globalFunctionType)) {
                     return type;
                 }
                 if (!targetType) {
+                    // Target type is type of construct signature
                     var constructSignatures = void 0;
-                    if (ts.getObjectFlags(rightType) & 2) {
+                    if (ts.getObjectFlags(rightType) & 2 /* Interface */) {
                         constructSignatures = resolveDeclaredMembers(rightType).declaredConstructSignatures;
                     }
-                    else if (ts.getObjectFlags(rightType) & 16) {
-                        constructSignatures = getSignaturesOfType(rightType, 1);
+                    else if (ts.getObjectFlags(rightType) & 16 /* Anonymous */) {
+                        constructSignatures = getSignaturesOfType(rightType, 1 /* Construct */);
                     }
                     if (constructSignatures && constructSignatures.length) {
                         targetType = getUnionType(ts.map(constructSignatures, function (signature) { return getReturnTypeOfSignature(getErasedSignature(signature)); }));
@@ -34372,12 +42136,19 @@ var ts;
                 if (!assumeTrue) {
                     return filterType(type, function (t) { return !isRelated(t, candidate); });
                 }
-                if (type.flags & 262144) {
+                // If the current type is a union type, remove all constituents that couldn't be instances of
+                // the candidate type. If one or more constituents remain, return a union of those.
+                if (type.flags & 262144 /* Union */) {
                     var assignableType = filterType(type, function (t) { return isRelated(t, candidate); });
-                    if (!(assignableType.flags & 32768)) {
+                    if (!(assignableType.flags & 32768 /* Never */)) {
                         return assignableType;
                     }
                 }
+                // If the candidate type is a subtype of the target type, narrow to the candidate type.
+                // Otherwise, if the target type is assignable to the candidate type, keep the target type.
+                // Otherwise, if the candidate type is assignable to the target type, narrow to the candidate
+                // type. Otherwise, the types are completely unrelated, so narrow to an intersection of the
+                // two types.
                 return isTypeSubtypeOf(candidate, type) ? candidate :
                     isTypeAssignableTo(type, candidate) ? type :
                         isTypeAssignableTo(candidate, type) ? candidate :
@@ -34392,6 +42163,7 @@ var ts;
                 if (!predicate) {
                     return type;
                 }
+                // Don't narrow from 'any' if the predicate type is exactly 'Object' or 'Function'
                 if (isTypeAny(type) && (predicate.type === globalObjectType || predicate.type === globalFunctionType)) {
                     return type;
                 }
@@ -34408,7 +42180,7 @@ var ts;
                 }
                 else {
                     var invokedExpression = ts.skipParentheses(callExpression.expression);
-                    if (invokedExpression.kind === 186 || invokedExpression.kind === 185) {
+                    if (invokedExpression.kind === 186 /* ElementAccessExpression */ || invokedExpression.kind === 185 /* PropertyAccessExpression */) {
                         var accessExpression = invokedExpression;
                         var possibleReference = ts.skipParentheses(accessExpression.expression);
                         if (isMatchingReference(reference, possibleReference)) {
@@ -34421,21 +42193,23 @@ var ts;
                 }
                 return type;
             }
+            // Narrow the given type based on the given expression having the assumed boolean value. The returned type
+            // will be a subtype or the same type as the argument.
             function narrowType(type, expr, assumeTrue) {
                 switch (expr.kind) {
-                    case 71:
-                    case 99:
-                    case 97:
-                    case 185:
+                    case 71 /* Identifier */:
+                    case 99 /* ThisKeyword */:
+                    case 97 /* SuperKeyword */:
+                    case 185 /* PropertyAccessExpression */:
                         return narrowTypeByTruthiness(type, expr, assumeTrue);
-                    case 187:
+                    case 187 /* CallExpression */:
                         return narrowTypeByTypePredicate(type, expr, assumeTrue);
-                    case 191:
+                    case 191 /* ParenthesizedExpression */:
                         return narrowType(type, expr.expression, assumeTrue);
-                    case 200:
+                    case 200 /* BinaryExpression */:
                         return narrowTypeByBinaryExpression(type, expr, assumeTrue);
-                    case 198:
-                        if (expr.operator === 51) {
+                    case 198 /* PrefixUnaryExpression */:
+                        if (expr.operator === 51 /* ExclamationToken */) {
                             return narrowType(type, expr.operand, !assumeTrue);
                         }
                         break;
@@ -34445,7 +42219,11 @@ var ts;
         }
         function getTypeOfSymbolAtLocation(symbol, location) {
             symbol = symbol.exportSymbol || symbol;
-            if (location.kind === 71) {
+            // If we have an identifier or a property access at the given location, if the location is
+            // an dotted name expression, and if the location is not an assignment target, obtain the type
+            // of the expression (which will reflect control flow analysis). If the expression indeed
+            // resolved to the given symbol, return the narrowed type.
+            if (location.kind === 71 /* Identifier */) {
                 if (ts.isRightSideOfQualifiedNameOrPropertyAccess(location)) {
                     location = location.parent;
                 }
@@ -34456,21 +42234,27 @@ var ts;
                     }
                 }
             }
+            // The location isn't a reference to the given symbol, meaning we're being asked
+            // a hypothetical question of what type the symbol would have if there was a reference
+            // to it at the given location. Since we have no control flow information for the
+            // hypothetical reference (control flow information is created and attached by the
+            // binder), we simply return the declared type of the symbol.
             return getTypeOfSymbol(symbol);
         }
         function getControlFlowContainer(node) {
             return ts.findAncestor(node.parent, function (node) {
                 return ts.isFunctionLike(node) && !ts.getImmediatelyInvokedFunctionExpression(node) ||
-                    node.kind === 240 ||
-                    node.kind === 274 ||
-                    node.kind === 152;
+                    node.kind === 240 /* ModuleBlock */ ||
+                    node.kind === 274 /* SourceFile */ ||
+                    node.kind === 152 /* PropertyDeclaration */;
             });
         }
+        // Check if a parameter is assigned anywhere within its declaring function.
         function isParameterAssigned(symbol) {
             var func = ts.getRootDeclaration(symbol.valueDeclaration).parent;
             var links = getNodeLinks(func);
-            if (!(links.flags & 4194304)) {
-                links.flags |= 4194304;
+            if (!(links.flags & 4194304 /* AssignmentsMarked */)) {
+                links.flags |= 4194304 /* AssignmentsMarked */;
                 if (!hasParentWithAssignmentsMarked(func)) {
                     markParameterAssignments(func);
                 }
@@ -34478,13 +42262,13 @@ var ts;
             return symbol.isAssigned || false;
         }
         function hasParentWithAssignmentsMarked(node) {
-            return !!ts.findAncestor(node.parent, function (node) { return ts.isFunctionLike(node) && !!(getNodeLinks(node).flags & 4194304); });
+            return !!ts.findAncestor(node.parent, function (node) { return ts.isFunctionLike(node) && !!(getNodeLinks(node).flags & 4194304 /* AssignmentsMarked */); });
         }
         function markParameterAssignments(node) {
-            if (node.kind === 71) {
+            if (node.kind === 71 /* Identifier */) {
                 if (ts.isAssignmentTarget(node)) {
                     var symbol = getResolvedSymbol(node);
-                    if (symbol.valueDeclaration && ts.getRootDeclaration(symbol.valueDeclaration).kind === 149) {
+                    if (symbol.valueDeclaration && ts.getRootDeclaration(symbol.valueDeclaration).kind === 149 /* Parameter */) {
                         symbol.isAssigned = true;
                     }
                 }
@@ -34494,34 +42278,39 @@ var ts;
             }
         }
         function isConstVariable(symbol) {
-            return symbol.flags & 3 && (getDeclarationNodeFlagsFromSymbol(symbol) & 2) !== 0 && getTypeOfSymbol(symbol) !== autoArrayType;
+            return symbol.flags & 3 /* Variable */ && (getDeclarationNodeFlagsFromSymbol(symbol) & 2 /* Const */) !== 0 && getTypeOfSymbol(symbol) !== autoArrayType;
         }
+        /** remove undefined from the annotated type of a parameter when there is an initializer (that doesn't include undefined) */
         function removeOptionalityFromDeclaredType(declaredType, declaration) {
             var annotationIncludesUndefined = strictNullChecks &&
-                declaration.kind === 149 &&
+                declaration.kind === 149 /* Parameter */ &&
                 declaration.initializer &&
-                getFalsyFlags(declaredType) & 8192 &&
-                !(getFalsyFlags(checkExpression(declaration.initializer)) & 8192);
-            return annotationIncludesUndefined ? getTypeWithFacts(declaredType, 131072) : declaredType;
+                getFalsyFlags(declaredType) & 8192 /* Undefined */ &&
+                !(getFalsyFlags(checkExpression(declaration.initializer)) & 8192 /* Undefined */);
+            return annotationIncludesUndefined ? getTypeWithFacts(declaredType, 131072 /* NEUndefined */) : declaredType;
         }
         function isConstraintPosition(node) {
             var parent = node.parent;
-            return parent.kind === 185 ||
-                parent.kind === 187 && parent.expression === node ||
-                parent.kind === 186 && parent.expression === node ||
-                parent.kind === 182 && parent.name === node && !!parent.initializer;
+            return parent.kind === 185 /* PropertyAccessExpression */ ||
+                parent.kind === 187 /* CallExpression */ && parent.expression === node ||
+                parent.kind === 186 /* ElementAccessExpression */ && parent.expression === node ||
+                parent.kind === 182 /* BindingElement */ && parent.name === node && !!parent.initializer;
         }
         function typeHasNullableConstraint(type) {
-            return type.flags & 14745600 && maybeTypeOfKind(getBaseConstraintOfType(type) || emptyObjectType, 24576);
+            return type.flags & 14745600 /* InstantiableNonPrimitive */ && maybeTypeOfKind(getBaseConstraintOfType(type) || emptyObjectType, 24576 /* Nullable */);
         }
         function getConstraintForLocation(type, node) {
+            // When a node is the left hand expression of a property access, element access, or call expression,
+            // and the type of the node includes type variables with constraints that are nullable, we fetch the
+            // apparent type of the node *before* performing control flow analysis such that narrowings apply to
+            // the constraint type.
             if (type && isConstraintPosition(node) && forEachType(type, typeHasNullableConstraint)) {
                 return mapType(getWidenedType(type), getBaseConstraintOrType);
             }
             return type;
         }
         function markAliasReferenced(symbol, location) {
-            if (isNonLocalAlias(symbol, 67216319) && !isInTypeQuery(location) && !isConstEnumOrConstEnumOnlyModule(resolveAlias(symbol))) {
+            if (isNonLocalAlias(symbol, /*excludes*/ 67216319 /* Value */) && !isInTypeQuery(location) && !isConstEnumOrConstEnumOnlyModule(resolveAlias(symbol))) {
                 markAliasSymbolAsReferenced(symbol);
             }
         }
@@ -34530,48 +42319,62 @@ var ts;
             if (symbol === unknownSymbol) {
                 return errorType;
             }
+            // As noted in ECMAScript 6 language spec, arrow functions never have an arguments objects.
+            // Although in down-level emit of arrow function, we emit it using function expression which means that
+            // arguments objects will be bound to the inner object; emitting arrow function natively in ES6, arguments objects
+            // will be bound to non-arrow function that contain this arrow function. This results in inconsistent behavior.
+            // To avoid that we will give an error to users if they use arguments objects in arrow function so that they
+            // can explicitly bound arguments objects
             if (symbol === argumentsSymbol) {
                 var container = ts.getContainingFunction(node);
-                if (languageVersion < 2) {
-                    if (container.kind === 193) {
+                if (languageVersion < 2 /* ES2015 */) {
+                    if (container.kind === 193 /* ArrowFunction */) {
                         error(node, ts.Diagnostics.The_arguments_object_cannot_be_referenced_in_an_arrow_function_in_ES3_and_ES5_Consider_using_a_standard_function_expression);
                     }
-                    else if (ts.hasModifier(container, 256)) {
+                    else if (ts.hasModifier(container, 256 /* Async */)) {
                         error(node, ts.Diagnostics.The_arguments_object_cannot_be_referenced_in_an_async_function_or_method_in_ES3_and_ES5_Consider_using_a_standard_function_or_method);
                     }
                 }
-                getNodeLinks(container).flags |= 8192;
+                getNodeLinks(container).flags |= 8192 /* CaptureArguments */;
                 return getTypeOfSymbol(symbol);
             }
+            // We should only mark aliases as referenced if there isn't a local value declaration
+            // for the symbol. Also, don't mark any property access expression LHS - checkPropertyAccessExpression will handle that
             if (!(node.parent && ts.isPropertyAccessExpression(node.parent) && node.parent.expression === node)) {
                 markAliasReferenced(symbol, node);
             }
             var localOrExportSymbol = getExportSymbolOfValueSymbolIfExported(symbol);
             var declaration = localOrExportSymbol.valueDeclaration;
-            if (localOrExportSymbol.flags & 32) {
-                if (declaration.kind === 235
+            if (localOrExportSymbol.flags & 32 /* Class */) {
+                // Due to the emit for class decorators, any reference to the class from inside of the class body
+                // must instead be rewritten to point to a temporary variable to avoid issues with the double-bind
+                // behavior of class names in ES6.
+                if (declaration.kind === 235 /* ClassDeclaration */
                     && ts.nodeIsDecorated(declaration)) {
                     var container = ts.getContainingClass(node);
                     while (container !== undefined) {
                         if (container === declaration && container.name !== node) {
-                            getNodeLinks(declaration).flags |= 8388608;
-                            getNodeLinks(node).flags |= 16777216;
+                            getNodeLinks(declaration).flags |= 8388608 /* ClassWithConstructorReference */;
+                            getNodeLinks(node).flags |= 16777216 /* ConstructorReferenceInClass */;
                             break;
                         }
                         container = ts.getContainingClass(container);
                     }
                 }
-                else if (declaration.kind === 205) {
-                    var container = ts.getThisContainer(node, false);
-                    while (container.kind !== 274) {
+                else if (declaration.kind === 205 /* ClassExpression */) {
+                    // When we emit a class expression with static members that contain a reference
+                    // to the constructor in the initializer, we will need to substitute that
+                    // binding with an alias as the class name is not in scope.
+                    var container = ts.getThisContainer(node, /*includeArrowFunctions*/ false);
+                    while (container.kind !== 274 /* SourceFile */) {
                         if (container.parent === declaration) {
-                            if (container.kind === 152 && ts.hasModifier(container, 32)) {
-                                getNodeLinks(declaration).flags |= 8388608;
-                                getNodeLinks(node).flags |= 16777216;
+                            if (container.kind === 152 /* PropertyDeclaration */ && ts.hasModifier(container, 32 /* Static */)) {
+                                getNodeLinks(declaration).flags |= 8388608 /* ClassWithConstructorReference */;
+                                getNodeLinks(node).flags |= 16777216 /* ConstructorReferenceInClass */;
                             }
                             break;
                         }
-                        container = ts.getThisContainer(container, false);
+                        container = ts.getThisContainer(container, /*includeArrowFunctions*/ false);
                     }
                 }
             }
@@ -34579,8 +42382,8 @@ var ts;
             var type = getConstraintForLocation(getTypeOfSymbol(localOrExportSymbol), node);
             var assignmentKind = ts.getAssignmentTargetKind(node);
             if (assignmentKind) {
-                if (!(localOrExportSymbol.flags & 3) &&
-                    !(ts.isInJavaScriptFile(node) && localOrExportSymbol.flags & 512)) {
+                if (!(localOrExportSymbol.flags & 3 /* Variable */) &&
+                    !(ts.isInJavaScriptFile(node) && localOrExportSymbol.flags & 512 /* ValueModule */)) {
                     error(node, ts.Diagnostics.Cannot_assign_to_0_because_it_is_not_a_variable, symbolToString(symbol));
                     return errorType;
                 }
@@ -34589,9 +42392,11 @@ var ts;
                     return errorType;
                 }
             }
-            var isAlias = localOrExportSymbol.flags & 2097152;
-            if (localOrExportSymbol.flags & 3) {
-                if (assignmentKind === 1) {
+            var isAlias = localOrExportSymbol.flags & 2097152 /* Alias */;
+            // We only narrow variables and parameters occurring in a non-assignment position. For all other
+            // entities we simply return the declared type.
+            if (localOrExportSymbol.flags & 3 /* Variable */) {
+                if (assignmentKind === 1 /* Definite */) {
                     return type;
                 }
             }
@@ -34604,26 +42409,38 @@ var ts;
             if (!declaration) {
                 return type;
             }
-            var isParameter = ts.getRootDeclaration(declaration).kind === 149;
+            // The declaration container is the innermost function that encloses the declaration of the variable
+            // or parameter. The flow container is the innermost function starting with which we analyze the control
+            // flow graph to determine the control flow based type.
+            var isParameter = ts.getRootDeclaration(declaration).kind === 149 /* Parameter */;
             var declarationContainer = getControlFlowContainer(declaration);
             var flowContainer = getControlFlowContainer(node);
             var isOuterVariable = flowContainer !== declarationContainer;
             var isSpreadDestructuringAsignmentTarget = node.parent && node.parent.parent && ts.isSpreadAssignment(node.parent) && isDestructuringAssignmentTarget(node.parent.parent);
-            while (flowContainer !== declarationContainer && (flowContainer.kind === 192 ||
-                flowContainer.kind === 193 || ts.isObjectLiteralOrClassExpressionMethod(flowContainer)) &&
+            // When the control flow originates in a function expression or arrow function and we are referencing
+            // a const variable or parameter from an outer function, we extend the origin of the control flow
+            // analysis to include the immediately enclosing function.
+            while (flowContainer !== declarationContainer && (flowContainer.kind === 192 /* FunctionExpression */ ||
+                flowContainer.kind === 193 /* ArrowFunction */ || ts.isObjectLiteralOrClassExpressionMethod(flowContainer)) &&
                 (isConstVariable(localOrExportSymbol) || isParameter && !isParameterAssigned(localOrExportSymbol))) {
                 flowContainer = getControlFlowContainer(flowContainer);
             }
+            // We only look for uninitialized variables in strict null checking mode, and only when we can analyze
+            // the entire control flow graph from the variable's declaration (i.e. when the flow container and
+            // declaration container are the same).
             var assumeInitialized = isParameter || isAlias || isOuterVariable || isSpreadDestructuringAsignmentTarget ||
-                type !== autoType && type !== autoArrayType && (!strictNullChecks || (type.flags & 3) !== 0 ||
-                    isInTypeQuery(node) || node.parent.kind === 252) ||
-                node.parent.kind === 209 ||
-                declaration.kind === 232 && declaration.exclamationToken ||
-                declaration.flags & 4194304;
+                type !== autoType && type !== autoArrayType && (!strictNullChecks || (type.flags & 3 /* AnyOrUnknown */) !== 0 ||
+                    isInTypeQuery(node) || node.parent.kind === 252 /* ExportSpecifier */) ||
+                node.parent.kind === 209 /* NonNullExpression */ ||
+                declaration.kind === 232 /* VariableDeclaration */ && declaration.exclamationToken ||
+                declaration.flags & 4194304 /* Ambient */;
             var initialType = assumeInitialized ? (isParameter ? removeOptionalityFromDeclaredType(type, declaration) : type) :
                 type === autoType || type === autoArrayType ? undefinedType :
                     getOptionalType(type);
             var flowType = getFlowTypeOfReference(node, type, initialType, flowContainer, !assumeInitialized);
+            // A variable is considered uninitialized when it is possible to analyze the entire control flow graph
+            // from declaration to use, and when the variable's declared type doesn't include undefined but the
+            // control flow based type does include undefined.
             if (type === autoType || type === autoArrayType) {
                 if (flowType === autoType || flowType === autoArrayType) {
                     if (noImplicitAny) {
@@ -34633,8 +42450,9 @@ var ts;
                     return convertAutoToAny(flowType);
                 }
             }
-            else if (!assumeInitialized && !(getFalsyFlags(type) & 8192) && getFalsyFlags(flowType) & 8192) {
+            else if (!assumeInitialized && !(getFalsyFlags(type) & 8192 /* Undefined */) && getFalsyFlags(flowType) & 8192 /* Undefined */) {
                 error(node, ts.Diagnostics.Variable_0_is_used_before_being_assigned, symbolToString(symbol));
+                // Return the declared type to reduce follow-on errors
                 return type;
             }
             return assignmentKind ? getBaseTypeOfLiteralType(flowType) : flowType;
@@ -34643,17 +42461,21 @@ var ts;
             return !!ts.findAncestor(node, function (n) { return n === threshold ? "quit" : ts.isFunctionLike(n); });
         }
         function checkNestedBlockScopedBinding(node, symbol) {
-            if (languageVersion >= 2 ||
-                (symbol.flags & (2 | 32)) === 0 ||
-                symbol.valueDeclaration.parent.kind === 269) {
+            if (languageVersion >= 2 /* ES2015 */ ||
+                (symbol.flags & (2 /* BlockScopedVariable */ | 32 /* Class */)) === 0 ||
+                symbol.valueDeclaration.parent.kind === 269 /* CatchClause */) {
                 return;
             }
+            // 1. walk from the use site up to the declaration and check
+            // if there is anything function like between declaration and use-site (is binding/class is captured in function).
+            // 2. walk from the declaration up to the boundary of lexical environment and check
+            // if there is an iteration statement in between declaration and boundary (is binding/class declared inside iteration statement)
             var container = ts.getEnclosingBlockScopeContainer(symbol.valueDeclaration);
             var usedInFunction = isInsideFunction(node.parent, container);
             var current = container;
             var containedInIterationStatement = false;
             while (current && !ts.nodeStartsNewLexicalEnvironment(current)) {
-                if (ts.isIterationStatement(current, false)) {
+                if (ts.isIterationStatement(current, /*lookInLabeledStatements*/ false)) {
                     containedInIterationStatement = true;
                     break;
                 }
@@ -34661,45 +42483,53 @@ var ts;
             }
             if (containedInIterationStatement) {
                 if (usedInFunction) {
-                    getNodeLinks(current).flags |= 65536;
+                    // mark iteration statement as containing block-scoped binding captured in some function
+                    getNodeLinks(current).flags |= 65536 /* LoopWithCapturedBlockScopedBinding */;
                 }
-                if (container.kind === 220 &&
-                    ts.getAncestor(symbol.valueDeclaration, 233).parent === container &&
+                // mark variables that are declared in loop initializer and reassigned inside the body of ForStatement.
+                // if body of ForStatement will be converted to function then we'll need a extra machinery to propagate reassigned values back.
+                if (container.kind === 220 /* ForStatement */ &&
+                    ts.getAncestor(symbol.valueDeclaration, 233 /* VariableDeclarationList */).parent === container &&
                     isAssignedInBodyOfForStatement(node, container)) {
-                    getNodeLinks(symbol.valueDeclaration).flags |= 2097152;
+                    getNodeLinks(symbol.valueDeclaration).flags |= 2097152 /* NeedsLoopOutParameter */;
                 }
-                getNodeLinks(symbol.valueDeclaration).flags |= 262144;
+                // set 'declared inside loop' bit on the block-scoped binding
+                getNodeLinks(symbol.valueDeclaration).flags |= 262144 /* BlockScopedBindingInLoop */;
             }
             if (usedInFunction) {
-                getNodeLinks(symbol.valueDeclaration).flags |= 131072;
+                getNodeLinks(symbol.valueDeclaration).flags |= 131072 /* CapturedBlockScopedBinding */;
             }
         }
         function isAssignedInBodyOfForStatement(node, container) {
+            // skip parenthesized nodes
             var current = node;
-            while (current.parent.kind === 191) {
+            while (current.parent.kind === 191 /* ParenthesizedExpression */) {
                 current = current.parent;
             }
+            // check if node is used as LHS in some assignment expression
             var isAssigned = false;
             if (ts.isAssignmentTarget(current)) {
                 isAssigned = true;
             }
-            else if ((current.parent.kind === 198 || current.parent.kind === 199)) {
+            else if ((current.parent.kind === 198 /* PrefixUnaryExpression */ || current.parent.kind === 199 /* PostfixUnaryExpression */)) {
                 var expr = current.parent;
-                isAssigned = expr.operator === 43 || expr.operator === 44;
+                isAssigned = expr.operator === 43 /* PlusPlusToken */ || expr.operator === 44 /* MinusMinusToken */;
             }
             if (!isAssigned) {
                 return false;
             }
+            // at this point we know that node is the target of assignment
+            // now check that modification happens inside the statement part of the ForStatement
             return !!ts.findAncestor(current, function (n) { return n === container ? "quit" : n === container.statement; });
         }
         function captureLexicalThis(node, container) {
-            getNodeLinks(node).flags |= 2;
-            if (container.kind === 152 || container.kind === 155) {
+            getNodeLinks(node).flags |= 2 /* LexicalThis */;
+            if (container.kind === 152 /* PropertyDeclaration */ || container.kind === 155 /* Constructor */) {
                 var classNode = container.parent;
-                getNodeLinks(classNode).flags |= 4;
+                getNodeLinks(classNode).flags |= 4 /* CaptureThis */;
             }
             else {
-                getNodeLinks(container).flags |= 4;
+                getNodeLinks(container).flags |= 4 /* CaptureThis */;
             }
         }
         function findFirstSuperCall(n) {
@@ -34711,14 +42541,26 @@ var ts;
             }
             return ts.forEachChild(n, findFirstSuperCall);
         }
+        /**
+         * Return a cached result if super-statement is already found.
+         * Otherwise, find a super statement in a given constructor function and cache the result in the node-links of the constructor
+         *
+         * @param constructor constructor-function to look for super statement
+         */
         function getSuperCallInConstructor(constructor) {
             var links = getNodeLinks(constructor);
+            // Only trying to find super-call if we haven't yet tried to find one.  Once we try, we will record the result
             if (links.hasSuperCall === undefined) {
                 links.superCall = findFirstSuperCall(constructor.body);
                 links.hasSuperCall = links.superCall ? true : false;
             }
             return links.superCall;
         }
+        /**
+         * Check if the given class-declaration extends null then return true.
+         * Otherwise, return false
+         * @param classDecl a class declaration to check if it extends null
+         */
         function classDeclarationExtendsNull(classDecl) {
             var classSymbol = getSymbolOfNode(classDecl);
             var classInstanceType = getDeclaredTypeOfSymbol(classSymbol);
@@ -34728,42 +42570,60 @@ var ts;
         function checkThisBeforeSuper(node, container, diagnosticMessage) {
             var containingClassDecl = container.parent;
             var baseTypeNode = ts.getClassExtendsHeritageClauseElement(containingClassDecl);
+            // If a containing class does not have extends clause or the class extends null
+            // skip checking whether super statement is called before "this" accessing.
             if (baseTypeNode && !classDeclarationExtendsNull(containingClassDecl)) {
                 var superCall = getSuperCallInConstructor(container);
+                // We should give an error in the following cases:
+                //      - No super-call
+                //      - "this" is accessing before super-call.
+                //          i.e super(this)
+                //              this.x; super();
+                // We want to make sure that super-call is done before accessing "this" so that
+                // "this" is not accessed as a parameter of the super-call.
                 if (!superCall || superCall.end > node.pos) {
+                    // In ES6, super inside constructor of class-declaration has to precede "this" accessing
                     error(node, diagnosticMessage);
                 }
             }
         }
         function checkThisExpression(node) {
-            var container = ts.getThisContainer(node, true);
+            // Stop at the first arrow function so that we can
+            // tell whether 'this' needs to be captured.
+            var container = ts.getThisContainer(node, /* includeArrowFunctions */ true);
             var needToCaptureLexicalThis = false;
-            if (container.kind === 155) {
+            if (container.kind === 155 /* Constructor */) {
                 checkThisBeforeSuper(node, container, ts.Diagnostics.super_must_be_called_before_accessing_this_in_the_constructor_of_a_derived_class);
             }
-            if (container.kind === 193) {
-                container = ts.getThisContainer(container, false);
-                needToCaptureLexicalThis = (languageVersion < 2);
+            // Now skip arrow functions to get the "real" owner of 'this'.
+            if (container.kind === 193 /* ArrowFunction */) {
+                container = ts.getThisContainer(container, /* includeArrowFunctions */ false);
+                // When targeting es6, arrow function lexically bind "this" so we do not need to do the work of binding "this" in emitted code
+                needToCaptureLexicalThis = (languageVersion < 2 /* ES2015 */);
             }
             switch (container.kind) {
-                case 239:
+                case 239 /* ModuleDeclaration */:
                     error(node, ts.Diagnostics.this_cannot_be_referenced_in_a_module_or_namespace_body);
+                    // do not return here so in case if lexical this is captured - it will be reflected in flags on NodeLinks
                     break;
-                case 238:
+                case 238 /* EnumDeclaration */:
                     error(node, ts.Diagnostics.this_cannot_be_referenced_in_current_location);
+                    // do not return here so in case if lexical this is captured - it will be reflected in flags on NodeLinks
                     break;
-                case 155:
+                case 155 /* Constructor */:
                     if (isInConstructorArgumentInitializer(node, container)) {
                         error(node, ts.Diagnostics.this_cannot_be_referenced_in_constructor_arguments);
+                        // do not return here so in case if lexical this is captured - it will be reflected in flags on NodeLinks
                     }
                     break;
-                case 152:
-                case 151:
-                    if (ts.hasModifier(container, 32)) {
+                case 152 /* PropertyDeclaration */:
+                case 151 /* PropertySignature */:
+                    if (ts.hasModifier(container, 32 /* Static */)) {
                         error(node, ts.Diagnostics.this_cannot_be_referenced_in_a_static_property_initializer);
+                        // do not return here so in case if lexical this is captured - it will be reflected in flags on NodeLinks
                     }
                     break;
-                case 147:
+                case 147 /* ComputedPropertyName */:
                     error(node, ts.Diagnostics.this_cannot_be_referenced_in_a_computed_property_name);
                     break;
             }
@@ -34772,23 +42632,28 @@ var ts;
             }
             var type = tryGetThisTypeAt(node, container);
             if (!type && noImplicitThis) {
+                // With noImplicitThis, functions may not reference 'this' if it has type 'any'
                 error(node, ts.Diagnostics.this_implicitly_has_type_any_because_it_does_not_have_a_type_annotation);
             }
             return type || anyType;
         }
         function tryGetThisTypeAt(node, container) {
-            if (container === void 0) { container = ts.getThisContainer(node, false); }
+            if (container === void 0) { container = ts.getThisContainer(node, /*includeArrowFunctions*/ false); }
             if (ts.isFunctionLike(container) &&
                 (!isInParameterInitializerBeforeContainingFunction(node) || ts.getThisParameter(container))) {
-                if (container.kind === 192 &&
-                    container.parent.kind === 200 &&
-                    ts.getSpecialPropertyAssignmentKind(container.parent) === 3) {
-                    var className = container.parent
-                        .left
-                        .expression
-                        .expression;
+                // Note: a parameter initializer should refer to class-this unless function-this is explicitly annotated.
+                // If this is a function in a JS file, it might be a class method. Check if it's the RHS
+                // of a x.prototype.y = function [name]() { .... }
+                if (container.kind === 192 /* FunctionExpression */ &&
+                    container.parent.kind === 200 /* BinaryExpression */ &&
+                    ts.getSpecialPropertyAssignmentKind(container.parent) === 3 /* PrototypeProperty */) {
+                    // Get the 'x' of 'x.prototype.y = f' (here, 'f' is 'container')
+                    var className = container.parent // x.prototype.y = f
+                        .left // x.prototype.y
+                        .expression // x.prototype
+                        .expression; // x
                     var classSymbol = checkExpression(className).symbol;
-                    if (classSymbol && classSymbol.members && (classSymbol.flags & 16)) {
+                    if (classSymbol && classSymbol.members && (classSymbol.flags & 16 /* Function */)) {
                         return getFlowTypeOfReference(node, getInferredClassType(classSymbol));
                     }
                 }
@@ -34799,7 +42664,7 @@ var ts;
             }
             if (ts.isClassLike(container.parent)) {
                 var symbol = getSymbolOfNode(container.parent);
-                var type = ts.hasModifier(container, 32) ? getTypeOfSymbol(symbol) : getDeclaredTypeOfSymbol(symbol).thisType;
+                var type = ts.hasModifier(container, 32 /* Static */) ? getTypeOfSymbol(symbol) : getDeclaredTypeOfSymbol(symbol).thisType;
                 return getFlowTypeOfReference(node, type);
             }
             if (ts.isInJavaScriptFile(node)) {
@@ -34811,7 +42676,7 @@ var ts;
         }
         function getTypeForThisExpressionFromJSDoc(node) {
             var jsdocType = ts.getJSDocType(node);
-            if (jsdocType && jsdocType.kind === 284) {
+            if (jsdocType && jsdocType.kind === 284 /* JSDocFunctionType */) {
                 var jsDocFunctionType = jsdocType;
                 if (jsDocFunctionType.parameters.length > 0 &&
                     jsDocFunctionType.parameters[0].name &&
@@ -34821,29 +42686,35 @@ var ts;
             }
         }
         function isInConstructorArgumentInitializer(node, constructorDecl) {
-            return !!ts.findAncestor(node, function (n) { return n === constructorDecl ? "quit" : n.kind === 149; });
+            return !!ts.findAncestor(node, function (n) { return n === constructorDecl ? "quit" : n.kind === 149 /* Parameter */; });
         }
         function checkSuperExpression(node) {
-            var isCallExpression = node.parent.kind === 187 && node.parent.expression === node;
-            var container = ts.getSuperContainer(node, true);
+            var isCallExpression = node.parent.kind === 187 /* CallExpression */ && node.parent.expression === node;
+            var container = ts.getSuperContainer(node, /*stopOnFunctions*/ true);
             var needToCaptureLexicalThis = false;
+            // adjust the container reference in case if super is used inside arrow functions with arbitrarily deep nesting
             if (!isCallExpression) {
-                while (container && container.kind === 193) {
-                    container = ts.getSuperContainer(container, true);
-                    needToCaptureLexicalThis = languageVersion < 2;
+                while (container && container.kind === 193 /* ArrowFunction */) {
+                    container = ts.getSuperContainer(container, /*stopOnFunctions*/ true);
+                    needToCaptureLexicalThis = languageVersion < 2 /* ES2015 */;
                 }
             }
             var canUseSuperExpression = isLegalUsageOfSuperExpression(container);
             var nodeCheckFlag = 0;
             if (!canUseSuperExpression) {
-                var current = ts.findAncestor(node, function (n) { return n === container ? "quit" : n.kind === 147; });
-                if (current && current.kind === 147) {
+                // issue more specific error if super is used in computed property name
+                // class A { foo() { return "1" }}
+                // class B {
+                //     [super.foo()]() {}
+                // }
+                var current = ts.findAncestor(node, function (n) { return n === container ? "quit" : n.kind === 147 /* ComputedPropertyName */; });
+                if (current && current.kind === 147 /* ComputedPropertyName */) {
                     error(node, ts.Diagnostics.super_cannot_be_referenced_in_a_computed_property_name);
                 }
                 else if (isCallExpression) {
                     error(node, ts.Diagnostics.Super_calls_are_not_permitted_outside_constructors_or_in_nested_functions_inside_constructors);
                 }
-                else if (!container || !container.parent || !(ts.isClassLike(container.parent) || container.parent.kind === 184)) {
+                else if (!container || !container.parent || !(ts.isClassLike(container.parent) || container.parent.kind === 184 /* ObjectLiteralExpression */)) {
                     error(node, ts.Diagnostics.super_can_only_be_referenced_in_members_of_derived_classes_or_object_literal_expressions);
                 }
                 else {
@@ -34851,36 +42722,97 @@ var ts;
                 }
                 return errorType;
             }
-            if (!isCallExpression && container.kind === 155) {
+            if (!isCallExpression && container.kind === 155 /* Constructor */) {
                 checkThisBeforeSuper(node, container, ts.Diagnostics.super_must_be_called_before_accessing_a_property_of_super_in_the_constructor_of_a_derived_class);
             }
-            if (ts.hasModifier(container, 32) || isCallExpression) {
-                nodeCheckFlag = 512;
+            if (ts.hasModifier(container, 32 /* Static */) || isCallExpression) {
+                nodeCheckFlag = 512 /* SuperStatic */;
             }
             else {
-                nodeCheckFlag = 256;
+                nodeCheckFlag = 256 /* SuperInstance */;
             }
             getNodeLinks(node).flags |= nodeCheckFlag;
-            if (container.kind === 154 && ts.hasModifier(container, 256)) {
+            // Due to how we emit async functions, we need to specialize the emit for an async method that contains a `super` reference.
+            // This is due to the fact that we emit the body of an async function inside of a generator function. As generator
+            // functions cannot reference `super`, we emit a helper inside of the method body, but outside of the generator. This helper
+            // uses an arrow function, which is permitted to reference `super`.
+            //
+            // There are two primary ways we can access `super` from within an async method. The first is getting the value of a property
+            // or indexed access on super, either as part of a right-hand-side expression or call expression. The second is when setting the value
+            // of a property or indexed access, either as part of an assignment expression or destructuring assignment.
+            //
+            // The simplest case is reading a value, in which case we will emit something like the following:
+            //
+            //  // ts
+            //  ...
+            //  async asyncMethod() {
+            //    let x = await super.asyncMethod();
+            //    return x;
+            //  }
+            //  ...
+            //
+            //  // js
+            //  ...
+            //  asyncMethod() {
+            //      const _super = name => super[name];
+            //      return __awaiter(this, arguments, Promise, function *() {
+            //          let x = yield _super("asyncMethod").call(this);
+            //          return x;
+            //      });
+            //  }
+            //  ...
+            //
+            // The more complex case is when we wish to assign a value, especially as part of a destructuring assignment. As both cases
+            // are legal in ES6, but also likely less frequent, we emit the same more complex helper for both scenarios:
+            //
+            //  // ts
+            //  ...
+            //  async asyncMethod(ar: Promise<any[]>) {
+            //      [super.a, super.b] = await ar;
+            //  }
+            //  ...
+            //
+            //  // js
+            //  ...
+            //  asyncMethod(ar) {
+            //      const _super = (function (geti, seti) {
+            //          const cache = Object.create(null);
+            //          return name => cache[name] || (cache[name] = { get value() { return geti(name); }, set value(v) { seti(name, v); } });
+            //      })(name => super[name], (name, value) => super[name] = value);
+            //      return __awaiter(this, arguments, Promise, function *() {
+            //          [_super("a").value, _super("b").value] = yield ar;
+            //      });
+            //  }
+            //  ...
+            //
+            // This helper creates an object with a "value" property that wraps the `super` property or indexed access for both get and set.
+            // This is required for destructuring assignments, as a call expression cannot be used as the target of a destructuring assignment
+            // while a property access can.
+            if (container.kind === 154 /* MethodDeclaration */ && ts.hasModifier(container, 256 /* Async */)) {
                 if (ts.isSuperProperty(node.parent) && ts.isAssignmentTarget(node.parent)) {
-                    getNodeLinks(container).flags |= 4096;
+                    getNodeLinks(container).flags |= 4096 /* AsyncMethodWithSuperBinding */;
                 }
                 else {
-                    getNodeLinks(container).flags |= 2048;
+                    getNodeLinks(container).flags |= 2048 /* AsyncMethodWithSuper */;
                 }
             }
             if (needToCaptureLexicalThis) {
+                // call expressions are allowed only in constructors so they should always capture correct 'this'
+                // super property access expressions can also appear in arrow functions -
+                // in this case they should also use correct lexical this
                 captureLexicalThis(node.parent, container);
             }
-            if (container.parent.kind === 184) {
-                if (languageVersion < 2) {
+            if (container.parent.kind === 184 /* ObjectLiteralExpression */) {
+                if (languageVersion < 2 /* ES2015 */) {
                     error(node, ts.Diagnostics.super_is_only_allowed_in_members_of_object_literal_expressions_when_option_target_is_ES2015_or_higher);
                     return errorType;
                 }
                 else {
+                    // for object literal assume that type of 'super' is 'any'
                     return anyType;
                 }
             }
+            // at this point the only legal case for parent is ClassLikeDeclaration
             var classLikeDeclaration = container.parent;
             if (!ts.getClassExtendsHeritageClauseElement(classLikeDeclaration)) {
                 error(node, ts.Diagnostics.super_can_only_be_referenced_in_a_derived_class);
@@ -34891,11 +42823,12 @@ var ts;
             if (!baseClassType) {
                 return errorType;
             }
-            if (container.kind === 155 && isInConstructorArgumentInitializer(node, container)) {
+            if (container.kind === 155 /* Constructor */ && isInConstructorArgumentInitializer(node, container)) {
+                // issue custom error message for super property access in constructor arguments (to be aligned with old compiler)
                 error(node, ts.Diagnostics.super_cannot_be_referenced_in_constructor_arguments);
                 return errorType;
             }
-            return nodeCheckFlag === 512
+            return nodeCheckFlag === 512 /* SuperStatic */
                 ? getBaseConstructorTypeOfClass(classType)
                 : getTypeWithThisArgument(baseClassType, classType.thisType);
             function isLegalUsageOfSuperExpression(container) {
@@ -34903,24 +42836,31 @@ var ts;
                     return false;
                 }
                 if (isCallExpression) {
-                    return container.kind === 155;
+                    // TS 1.0 SPEC (April 2014): 4.8.1
+                    // Super calls are only permitted in constructors of derived classes
+                    return container.kind === 155 /* Constructor */;
                 }
                 else {
-                    if (ts.isClassLike(container.parent) || container.parent.kind === 184) {
-                        if (ts.hasModifier(container, 32)) {
-                            return container.kind === 154 ||
-                                container.kind === 153 ||
-                                container.kind === 156 ||
-                                container.kind === 157;
+                    // TS 1.0 SPEC (April 2014)
+                    // 'super' property access is allowed
+                    // - In a constructor, instance member function, instance member accessor, or instance member variable initializer where this references a derived class instance
+                    // - In a static member function or static member accessor
+                    // topmost container must be something that is directly nested in the class declaration\object literal expression
+                    if (ts.isClassLike(container.parent) || container.parent.kind === 184 /* ObjectLiteralExpression */) {
+                        if (ts.hasModifier(container, 32 /* Static */)) {
+                            return container.kind === 154 /* MethodDeclaration */ ||
+                                container.kind === 153 /* MethodSignature */ ||
+                                container.kind === 156 /* GetAccessor */ ||
+                                container.kind === 157 /* SetAccessor */;
                         }
                         else {
-                            return container.kind === 154 ||
-                                container.kind === 153 ||
-                                container.kind === 156 ||
-                                container.kind === 157 ||
-                                container.kind === 152 ||
-                                container.kind === 151 ||
-                                container.kind === 155;
+                            return container.kind === 154 /* MethodDeclaration */ ||
+                                container.kind === 153 /* MethodSignature */ ||
+                                container.kind === 156 /* GetAccessor */ ||
+                                container.kind === 157 /* SetAccessor */ ||
+                                container.kind === 152 /* PropertyDeclaration */ ||
+                                container.kind === 151 /* PropertySignature */ ||
+                                container.kind === 155 /* Constructor */;
                         }
                     }
                 }
@@ -34928,22 +42868,22 @@ var ts;
             }
         }
         function getContainingObjectLiteral(func) {
-            return (func.kind === 154 ||
-                func.kind === 156 ||
-                func.kind === 157) && func.parent.kind === 184 ? func.parent :
-                func.kind === 192 && func.parent.kind === 270 ? func.parent.parent :
+            return (func.kind === 154 /* MethodDeclaration */ ||
+                func.kind === 156 /* GetAccessor */ ||
+                func.kind === 157 /* SetAccessor */) && func.parent.kind === 184 /* ObjectLiteralExpression */ ? func.parent :
+                func.kind === 192 /* FunctionExpression */ && func.parent.kind === 270 /* PropertyAssignment */ ? func.parent.parent :
                     undefined;
         }
         function getThisTypeArgument(type) {
-            return ts.getObjectFlags(type) & 4 && type.target === globalThisType ? type.typeArguments[0] : undefined;
+            return ts.getObjectFlags(type) & 4 /* Reference */ && type.target === globalThisType ? type.typeArguments[0] : undefined;
         }
         function getThisTypeFromContextualType(type) {
             return mapType(type, function (t) {
-                return t.flags & 524288 ? ts.forEach(t.types, getThisTypeArgument) : getThisTypeArgument(t);
+                return t.flags & 524288 /* Intersection */ ? ts.forEach(t.types, getThisTypeArgument) : getThisTypeArgument(t);
             });
         }
         function getContextualThisParameterType(func) {
-            if (func.kind === 193) {
+            if (func.kind === 193 /* ArrowFunction */) {
                 return undefined;
             }
             if (isContextSensitiveFunctionOrObjectLiteralMethod(func)) {
@@ -34959,6 +42899,9 @@ var ts;
             if (noImplicitThis || inJs) {
                 var containingLiteral = getContainingObjectLiteral(func);
                 if (containingLiteral) {
+                    // We have an object literal method. Check if the containing object literal has a contextual type
+                    // that includes a ThisType<T>. If so, T is the contextual type for 'this'. We continue looking in
+                    // any directly enclosing object literals.
                     var contextualType = getApparentTypeOfContextualType(containingLiteral);
                     var literal = containingLiteral;
                     var type = contextualType;
@@ -34967,19 +42910,25 @@ var ts;
                         if (thisType) {
                             return instantiateType(thisType, getContextualMapper(containingLiteral));
                         }
-                        if (literal.parent.kind !== 270) {
+                        if (literal.parent.kind !== 270 /* PropertyAssignment */) {
                             break;
                         }
                         literal = literal.parent.parent;
                         type = getApparentTypeOfContextualType(literal);
                     }
+                    // There was no contextual ThisType<T> for the containing object literal, so the contextual type
+                    // for 'this' is the non-null form of the contextual type for the containing object literal or
+                    // the type of the object literal itself.
                     return contextualType ? getNonNullableType(contextualType) : checkExpressionCached(containingLiteral);
                 }
+                // In an assignment of the form 'obj.xxx = function(...)' or 'obj[xxx] = function(...)', the
+                // contextual type for 'this' is 'obj'.
                 var parent = func.parent;
-                if (parent.kind === 200 && parent.operatorToken.kind === 58) {
+                if (parent.kind === 200 /* BinaryExpression */ && parent.operatorToken.kind === 58 /* EqualsToken */) {
                     var target = parent.left;
-                    if (target.kind === 185 || target.kind === 186) {
+                    if (target.kind === 185 /* PropertyAccessExpression */ || target.kind === 186 /* ElementAccessExpression */) {
                         var expression = target.expression;
+                        // Don't contextually type `this` as `exports` in `exports.Point = function(x, y) { this.x = x; this.y = y; }`
                         if (inJs && ts.isIdentifier(expression)) {
                             var sourceFile = ts.getSourceFileOfNode(parent);
                             if (sourceFile.commonJsModuleIndicator && getResolvedSymbol(expression) === sourceFile.symbol) {
@@ -34992,6 +42941,7 @@ var ts;
             }
             return undefined;
         }
+        // Return contextual type of parameter or undefined if no contextual type is available
         function getContextuallyTypedParameterType(parameter) {
             var func = parameter.parent;
             if (!isContextSensitiveFunctionOrObjectLiteralMethod(func)) {
@@ -35022,12 +42972,13 @@ var ts;
                 var len = func.parameters.length - (funcHasRestParameters ? 1 : 0);
                 var indexOfParameter = func.parameters.indexOf(parameter);
                 if (ts.getThisParameter(func) !== undefined && !contextualSignature.thisParameter) {
-                    ts.Debug.assert(indexOfParameter !== 0);
+                    ts.Debug.assert(indexOfParameter !== 0); // Otherwise we should not have called `getContextuallyTypedParameterType`.
                     indexOfParameter -= 1;
                 }
                 if (indexOfParameter < len) {
                     return getTypeAtPosition(contextualSignature, indexOfParameter);
                 }
+                // If last parameter is contextually rest parameter get its type
                 if (funcHasRestParameters &&
                     indexOfParameter === (func.parameters.length - 1) &&
                     isRestParameterIndex(contextualSignature, func.parameters.length - 1)) {
@@ -35035,6 +42986,14 @@ var ts;
                 }
             }
         }
+        // In a variable, parameter or property declaration with a type annotation,
+        //   the contextual type of an initializer expression is the type of the variable, parameter or property.
+        // Otherwise, in a parameter declaration of a contextually typed function expression,
+        //   the contextual type of an initializer expression is the contextual type of the parameter.
+        // Otherwise, in a variable or parameter declaration with a binding pattern name,
+        //   the contextual type of an initializer expression is the type implied by the binding pattern.
+        // Otherwise, in a binding pattern inside a variable or parameter declaration,
+        //   the contextual type of an initializer expression is the type annotation of the containing declaration, if present.
         function getContextualTypeForInitializerExpression(node) {
             var declaration = node.parent;
             if (ts.hasInitializer(declaration) && node === declaration.initializer) {
@@ -35042,19 +43001,19 @@ var ts;
                 if (typeNode) {
                     return getTypeFromTypeNode(typeNode);
                 }
-                if (declaration.kind === 149) {
+                if (declaration.kind === 149 /* Parameter */) {
                     var type = getContextuallyTypedParameterType(declaration);
                     if (type) {
                         return type;
                     }
                 }
                 if (ts.isBindingPattern(declaration.name)) {
-                    return getTypeFromBindingPattern(declaration.name, true, false);
+                    return getTypeFromBindingPattern(declaration.name, /*includePatternInType*/ true, /*reportErrors*/ false);
                 }
                 if (ts.isBindingPattern(declaration.parent)) {
                     var parentDeclaration = declaration.parent.parent;
                     var name = declaration.propertyName || declaration.name;
-                    if (parentDeclaration.kind !== 182) {
+                    if (parentDeclaration.kind !== 182 /* BindingElement */) {
                         var parentTypeNode = ts.getEffectiveTypeAnnotationNode(parentDeclaration);
                         if (parentTypeNode && !ts.isBindingPattern(name)) {
                             var text = ts.getTextOfPropertyName(name);
@@ -35071,13 +43030,13 @@ var ts;
             var func = ts.getContainingFunction(node);
             if (func) {
                 var functionFlags = ts.getFunctionFlags(func);
-                if (functionFlags & 1) {
+                if (functionFlags & 1 /* Generator */) { // AsyncGenerator function or Generator function
                     return undefined;
                 }
                 var contextualReturnType = getContextualReturnType(func);
-                return functionFlags & 2
-                    ? contextualReturnType && getAwaitedTypeOfPromise(contextualReturnType)
-                    : contextualReturnType;
+                return functionFlags & 2 /* Async */
+                    ? contextualReturnType && getAwaitedTypeOfPromise(contextualReturnType) // Async function
+                    : contextualReturnType; // Regular function
             }
             return undefined;
         }
@@ -35089,7 +43048,7 @@ var ts;
                 if (contextualReturnType) {
                     return node.asteriskToken
                         ? contextualReturnType
-                        : getIteratedTypeOfGenerator(contextualReturnType, (functionFlags & 2) !== 0);
+                        : getIteratedTypeOfGenerator(contextualReturnType, (functionFlags & 2 /* Async */) !== 0);
                 }
             }
             return undefined;
@@ -35108,28 +43067,35 @@ var ts;
             return false;
         }
         function getContextualReturnType(functionDecl) {
-            if (functionDecl.kind === 155 ||
+            // If the containing function has a return type annotation, is a constructor, or is a get accessor whose
+            // corresponding set accessor has a type annotation, return statements in the function are contextually typed
+            if (functionDecl.kind === 155 /* Constructor */ ||
                 ts.getEffectiveReturnTypeNode(functionDecl) ||
                 isGetAccessorWithAnnotatedSetAccessor(functionDecl)) {
                 return getReturnTypeOfSignature(getSignatureFromDeclaration(functionDecl));
             }
+            // Otherwise, if the containing function is contextually typed by a function type with exactly one call signature
+            // and that call signature is non-generic, return statements are contextually typed by the return type of the signature
             var signature = getContextualSignatureForFunctionLikeDeclaration(functionDecl);
             if (signature && !isResolvingReturnTypeOfSignature(signature)) {
                 return getReturnTypeOfSignature(signature);
             }
             return undefined;
         }
+        // In a typed function call, an argument or substitution expression is contextually typed by the type of the corresponding parameter.
         function getContextualTypeForArgument(callTarget, arg) {
-            var args = getEffectiveCallArguments(callTarget);
-            var argIndex = args.indexOf(arg);
+            var args = getEffectiveCallArguments(callTarget); // TODO: GH#18217
+            var argIndex = args.indexOf(arg); // -1 for e.g. the expression of a CallExpression, or the tag of a TaggedTemplateExpression
             return argIndex === -1 ? undefined : getContextualTypeForArgumentAtIndex(callTarget, argIndex);
         }
         function getContextualTypeForArgumentAtIndex(callTarget, argIndex) {
+            // If we're already in the process of resolving the given signature, don't resolve again as
+            // that could cause infinite recursion. Instead, return anySignature.
             var signature = getNodeLinks(callTarget).resolvedSignature === resolvingSignature ? resolvingSignature : getResolvedSignature(callTarget);
             return getTypeAtPosition(signature, argIndex);
         }
         function getContextualTypeForSubstitutionExpression(template, substitutionExpression) {
-            if (template.parent.kind === 189) {
+            if (template.parent.kind === 189 /* TaggedTemplateExpression */) {
                 return getContextualTypeForArgument(template.parent, substitutionExpression);
             }
             return undefined;
@@ -35138,31 +43104,38 @@ var ts;
             var binaryExpression = node.parent;
             var left = binaryExpression.left, operatorToken = binaryExpression.operatorToken, right = binaryExpression.right;
             switch (operatorToken.kind) {
-                case 58:
+                case 58 /* EqualsToken */:
                     return node === right && isContextSensitiveAssignment(binaryExpression) ? getTypeOfExpression(left) : undefined;
-                case 54:
+                case 54 /* BarBarToken */:
+                    // When an || expression has a contextual type, the operands are contextually typed by that type. When an ||
+                    // expression has no contextual type, the right operand is contextually typed by the type of the left operand,
+                    // except for the special case of Javascript declarations of the form `namespace.prop = namespace.prop || {}`
                     var type = getContextualType(binaryExpression);
                     return !type && node === right && !ts.isDefaultedJavascriptInitializer(binaryExpression) ?
                         getTypeOfExpression(left) : type;
-                case 53:
-                case 26:
+                case 53 /* AmpersandAmpersandToken */:
+                case 26 /* CommaToken */:
                     return node === right ? getContextualType(binaryExpression) : undefined;
                 default:
                     return undefined;
             }
         }
+        // In an assignment expression, the right operand is contextually typed by the type of the left operand.
+        // Don't do this for special property assignments to avoid circularity.
         function isContextSensitiveAssignment(binaryExpression) {
             var kind = ts.getSpecialPropertyAssignmentKind(binaryExpression);
             switch (kind) {
-                case 0:
+                case 0 /* None */:
                     return true;
-                case 5:
+                case 5 /* Property */:
+                    // If `binaryExpression.left` was assigned a symbol, then this is a new declaration; otherwise it is an assignment to an existing declaration.
+                    // See `bindStaticPropertyAssignment` in `binder.ts`.
                     return !binaryExpression.left.symbol;
-                case 1:
-                case 2:
-                case 3:
-                case 4:
-                case 6:
+                case 1 /* ExportsProperty */:
+                case 2 /* ModuleExports */:
+                case 3 /* PrototypeProperty */:
+                case 4 /* ThisProperty */:
+                case 6 /* Prototype */:
                     return false;
                 default:
                     return ts.Debug.assertNever(kind);
@@ -35170,19 +43143,24 @@ var ts;
         }
         function getTypeOfPropertyOfContextualType(type, name) {
             return mapType(type, function (t) {
-                var prop = t.flags & 917504 ? getPropertyOfType(t, name) : undefined;
+                var prop = t.flags & 917504 /* StructuredType */ ? getPropertyOfType(t, name) : undefined;
                 return prop ? getTypeOfSymbol(prop) : undefined;
-            }, true);
+            }, /*noReductions*/ true);
         }
         function getIndexTypeOfContextualType(type, kind) {
-            return mapType(type, function (t) { return getIndexTypeOfStructuredType(t, kind); }, true);
+            return mapType(type, function (t) { return getIndexTypeOfStructuredType(t, kind); }, /*noReductions*/ true);
         }
+        // Return true if the given contextual type is a tuple-like type
         function contextualTypeIsTupleLikeType(type) {
-            return !!(type.flags & 262144 ? ts.forEach(type.types, isTupleLikeType) : isTupleLikeType(type));
+            return !!(type.flags & 262144 /* Union */ ? ts.forEach(type.types, isTupleLikeType) : isTupleLikeType(type));
         }
+        // In an object literal contextually typed by a type T, the contextual type of a property assignment is the type of
+        // the matching property in T, if one exists. Otherwise, it is the type of the numeric index signature in T, if one
+        // exists. Otherwise, it is the type of the string index signature in T, if one exists.
         function getContextualTypeForObjectLiteralMethod(node) {
             ts.Debug.assert(ts.isObjectLiteralMethod(node));
-            if (node.flags & 8388608) {
+            if (node.flags & 8388608 /* InWithStatement */) {
+                // We cannot answer semantic questions within a with block, do not proceed any further
                 return undefined;
             }
             return getContextualTypeForObjectLiteralElement(node);
@@ -35192,28 +43170,37 @@ var ts;
             var type = getApparentTypeOfContextualType(objectLiteral);
             if (type) {
                 if (!hasNonBindableDynamicName(element)) {
+                    // For a (non-symbol) computed property, there is no reason to look up the name
+                    // in the type. It will just be "__computed", which does not appear in any
+                    // SymbolTable.
                     var symbolName_1 = getSymbolOfNode(element).escapedName;
                     var propertyType = getTypeOfPropertyOfContextualType(type, symbolName_1);
                     if (propertyType) {
                         return propertyType;
                     }
                 }
-                return isNumericName(element.name) && getIndexTypeOfContextualType(type, 1) ||
-                    getIndexTypeOfContextualType(type, 0);
+                return isNumericName(element.name) && getIndexTypeOfContextualType(type, 1 /* Number */) ||
+                    getIndexTypeOfContextualType(type, 0 /* String */);
             }
             return undefined;
         }
+        // In an array literal contextually typed by a type T, the contextual type of an element expression at index N is
+        // the type of the property with the numeric name N in T, if one exists. Otherwise, if T has a numeric index signature,
+        // it is the type of the numeric index signature in T. Otherwise, in ES6 and higher, the contextual type is the iterated
+        // type of T.
         function getContextualTypeForElementExpression(arrayContextualType, index) {
             return arrayContextualType && (getTypeOfPropertyOfContextualType(arrayContextualType, "" + index)
-                || getIndexTypeOfContextualType(arrayContextualType, 1)
-                || getIteratedTypeOrElementType(arrayContextualType, undefined, false, false, false));
+                || getIndexTypeOfContextualType(arrayContextualType, 1 /* Number */)
+                || getIteratedTypeOrElementType(arrayContextualType, /*errorNode*/ undefined, /*allowStringInput*/ false, /*allowAsyncIterables*/ false, /*checkAssignability*/ false));
         }
+        // In a contextually typed conditional expression, the true/false expressions are contextually typed by the same type.
         function getContextualTypeForConditionalOperand(node) {
             var conditional = node.parent;
             return node === conditional.whenTrue || node === conditional.whenFalse ? getContextualType(conditional) : undefined;
         }
         function getContextualTypeForChildJsxExpression(node) {
             var attributesType = getApparentTypeOfContextualType(node.openingElement.tagName);
+            // JSX expression is in children of JSX Element, we will look for an "children" atttribute (we get the name from JSX.ElementAttributesProperty)
             var jsxChildrenPropertyName = getJsxElementChildrenPropertyName(getJsxNamespaceAt(node));
             return attributesType && !isTypeAny(attributesType) && jsxChildrenPropertyName && jsxChildrenPropertyName !== "" ? getTypeOfPropertyOfContextualType(attributesType, jsxChildrenPropertyName) : undefined;
         }
@@ -35226,6 +43213,9 @@ var ts;
                     : undefined;
         }
         function getContextualTypeForJsxAttribute(attribute) {
+            // When we trying to resolve JsxOpeningLikeElement as a stateless function element, we will already give its attributes a contextual type
+            // which is a type of the parameter of the signature we are trying out.
+            // If there is no contextual type (e.g. we are trying to resolve stateful component), get attributes type from resolving element's tagName
             if (ts.isJsxAttribute(attribute)) {
                 var attributesType = getApparentTypeOfContextualType(attribute.parent);
                 if (!attributesType || isTypeAny(attributesType)) {
@@ -35237,44 +43227,50 @@ var ts;
                 return getContextualType(attribute.parent);
             }
         }
+        // Return true if the given expression is possibly a discriminant value. We limit the kinds of
+        // expressions we check to those that don't depend on their contextual type in order not to cause
+        // recursive (and possibly infinite) invocations of getContextualType.
         function isPossiblyDiscriminantValue(node) {
             switch (node.kind) {
-                case 9:
-                case 8:
-                case 13:
-                case 101:
-                case 86:
-                case 95:
-                case 71:
+                case 9 /* StringLiteral */:
+                case 8 /* NumericLiteral */:
+                case 13 /* NoSubstitutionTemplateLiteral */:
+                case 101 /* TrueKeyword */:
+                case 86 /* FalseKeyword */:
+                case 95 /* NullKeyword */:
+                case 71 /* Identifier */:
                     return true;
-                case 185:
-                case 191:
+                case 185 /* PropertyAccessExpression */:
+                case 191 /* ParenthesizedExpression */:
                     return isPossiblyDiscriminantValue(node.expression);
             }
             return false;
         }
+        // Return the contextual type for a given expression node. During overload resolution, a contextual type may temporarily
+        // be "pushed" onto a node using the contextualType property.
         function getApparentTypeOfContextualType(node) {
             var contextualType = getContextualType(node);
             contextualType = contextualType && mapType(contextualType, getApparentType);
-            if (!(contextualType && contextualType.flags & 262144 && ts.isObjectLiteralExpression(node))) {
+            if (!(contextualType && contextualType.flags & 262144 /* Union */ && ts.isObjectLiteralExpression(node))) {
                 return contextualType;
             }
+            // Keep the below up-to-date with the work done within `isRelatedTo` by `findMatchingDiscriminantType`
             var match;
             propLoop: for (var _i = 0, _a = node.properties; _i < _a.length; _i++) {
                 var prop = _a[_i];
                 if (!prop.symbol)
                     continue;
-                if (prop.kind !== 270)
+                if (prop.kind !== 270 /* PropertyAssignment */)
                     continue;
                 if (isPossiblyDiscriminantValue(prop.initializer) && isDiscriminantProperty(contextualType, prop.symbol.escapedName)) {
                     var discriminatingType = checkExpression(prop.initializer);
                     for (var _b = 0, _c = contextualType.types; _b < _c.length; _b++) {
                         var type = _c[_b];
                         var targetType = getTypeOfPropertyOfType(type, prop.symbol.escapedName);
-                        if (targetType && checkTypeAssignableTo(discriminatingType, targetType, undefined)) {
+                        if (targetType && checkTypeAssignableTo(discriminatingType, targetType, /*errorNode*/ undefined)) {
                             if (match) {
                                 if (type === match)
-                                    continue;
+                                    continue; // Finding multiple fields which discriminate to the same type is fine
                                 match = undefined;
                                 break propLoop;
                             }
@@ -35285,8 +43281,26 @@ var ts;
             }
             return match || contextualType;
         }
+        /**
+         * Woah! Do you really want to use this function?
+         *
+         * Unless you're trying to get the *non-apparent* type for a
+         * value-literal type or you're authoring relevant portions of this algorithm,
+         * you probably meant to use 'getApparentTypeOfContextualType'.
+         * Otherwise this may not be very useful.
+         *
+         * In cases where you *are* working on this function, you should understand
+         * when it is appropriate to use 'getContextualType' and 'getApparentTypeOfContextualType'.
+         *
+         *   - Use 'getContextualType' when you are simply going to propagate the result to the expression.
+         *   - Use 'getApparentTypeOfContextualType' when you're going to need the members of the type.
+         *
+         * @param node the expression whose contextual type will be returned.
+         * @returns the contextual type of an expression.
+         */
         function getContextualType(node) {
-            if (node.flags & 8388608) {
+            if (node.flags & 8388608 /* InWithStatement */) {
+                // We cannot answer semantic questions within a with block, do not proceed any further
                 return undefined;
             }
             if (node.contextualType) {
@@ -35294,51 +43308,52 @@ var ts;
             }
             var parent = node.parent;
             switch (parent.kind) {
-                case 232:
-                case 149:
-                case 152:
-                case 151:
-                case 182:
+                case 232 /* VariableDeclaration */:
+                case 149 /* Parameter */:
+                case 152 /* PropertyDeclaration */:
+                case 151 /* PropertySignature */:
+                case 182 /* BindingElement */:
                     return getContextualTypeForInitializerExpression(node);
-                case 193:
-                case 225:
+                case 193 /* ArrowFunction */:
+                case 225 /* ReturnStatement */:
                     return getContextualTypeForReturnExpression(node);
-                case 203:
+                case 203 /* YieldExpression */:
                     return getContextualTypeForYieldOperand(parent);
-                case 187:
-                case 188:
+                case 187 /* CallExpression */:
+                case 188 /* NewExpression */:
                     return getContextualTypeForArgument(parent, node);
-                case 190:
-                case 208:
+                case 190 /* TypeAssertionExpression */:
+                case 208 /* AsExpression */:
                     return getTypeFromTypeNode(parent.type);
-                case 200:
+                case 200 /* BinaryExpression */:
                     return getContextualTypeForBinaryOperand(node);
-                case 270:
-                case 271:
+                case 270 /* PropertyAssignment */:
+                case 271 /* ShorthandPropertyAssignment */:
                     return getContextualTypeForObjectLiteralElement(parent);
-                case 272:
+                case 272 /* SpreadAssignment */:
                     return getApparentTypeOfContextualType(parent.parent);
-                case 183: {
+                case 183 /* ArrayLiteralExpression */: {
                     var arrayLiteral = parent;
                     var type = getApparentTypeOfContextualType(arrayLiteral);
                     return getContextualTypeForElementExpression(type, ts.indexOfNode(arrayLiteral.elements, node));
                 }
-                case 201:
+                case 201 /* ConditionalExpression */:
                     return getContextualTypeForConditionalOperand(node);
-                case 211:
-                    ts.Debug.assert(parent.parent.kind === 202);
+                case 211 /* TemplateSpan */:
+                    ts.Debug.assert(parent.parent.kind === 202 /* TemplateExpression */);
                     return getContextualTypeForSubstitutionExpression(parent.parent, node);
-                case 191: {
+                case 191 /* ParenthesizedExpression */: {
+                    // Like in `checkParenthesizedExpression`, an `/** @type {xyz} */` comment before a parenthesized expression acts as a type cast.
                     var tag = ts.isInJavaScriptFile(parent) ? ts.getJSDocTypeTag(parent) : undefined;
                     return tag ? getTypeFromTypeNode(tag.typeExpression.type) : getContextualType(parent);
                 }
-                case 265:
+                case 265 /* JsxExpression */:
                     return getContextualTypeForJsxExpression(parent);
-                case 262:
-                case 264:
+                case 262 /* JsxAttribute */:
+                case 264 /* JsxSpreadAttribute */:
                     return getContextualTypeForJsxAttribute(parent);
-                case 257:
-                case 256:
+                case 257 /* JsxOpeningElement */:
+                case 256 /* JsxSelfClosingElement */:
                     return getContextualJsxElementAttributesType(parent);
             }
             return undefined;
@@ -35353,16 +43368,22 @@ var ts;
             }
             var valueType = checkExpression(node.tagName);
             if (isTypeAny(valueType)) {
+                // Short-circuit if the class tag is using an element type 'any'
                 return anyType;
             }
             var isJs = ts.isInJavaScriptFile(node);
             return mapType(valueType, function (t) { return getJsxSignaturesParameterTypes(t, isJs, node); });
         }
         function getJsxSignaturesParameterTypes(valueType, isJs, context) {
-            if (valueType.flags & 4) {
+            // If the elemType is a string type, we have to return anyType to prevent an error downstream as we will try to find construct or call signature of the type
+            if (valueType.flags & 4 /* String */) {
                 return anyType;
             }
-            else if (valueType.flags & 64) {
+            else if (valueType.flags & 64 /* StringLiteral */) {
+                // If the elemType is a stringLiteral type, we can then provide a check to make sure that the string literal type is one of the Jsx intrinsic element type
+                // For example:
+                //      var CustomTag: "h1" = "h1";
+                //      <CustomTag> Hello World </CustomTag>
                 var intrinsicElementsType = getJsxType(JsxNames.IntrinsicElements, context);
                 if (intrinsicElementsType !== errorType) {
                     var stringLiteralTypeName = valueType.value;
@@ -35370,19 +43391,22 @@ var ts;
                     if (intrinsicProp) {
                         return getTypeOfSymbol(intrinsicProp);
                     }
-                    var indexSignatureType = getIndexTypeOfType(intrinsicElementsType, 0);
+                    var indexSignatureType = getIndexTypeOfType(intrinsicElementsType, 0 /* String */);
                     if (indexSignatureType) {
                         return indexSignatureType;
                     }
                 }
                 return anyType;
             }
-            var signatures = getSignaturesOfType(valueType, 1);
+            // Resolve the signatures, preferring constructor
+            var signatures = getSignaturesOfType(valueType, 1 /* Construct */);
             var ctor = true;
             if (signatures.length === 0) {
-                signatures = getSignaturesOfType(valueType, 0);
+                // No construct signatures, try call signatures
+                signatures = getSignaturesOfType(valueType, 0 /* Call */);
                 ctor = false;
                 if (signatures.length === 0) {
+                    // We found no signatures at all, which is an error
                     return errorType;
                 }
             }
@@ -35399,7 +43423,7 @@ var ts;
                 links.resolvedSignatures.set(cacheKey, resolvingSignaturesArray);
                 links.resolvedSignatures.set(cacheKey, signatures = instantiateJsxSignatures(context, signatures));
             }
-            return getUnionType(ts.map(signatures, ctor ? function (t) { return getJsxPropsTypeFromClassType(t, isJs, context, false); } : function (t) { return getJsxPropsTypeFromCallSignature(t, context); }), 0);
+            return getUnionType(ts.map(signatures, ctor ? function (t) { return getJsxPropsTypeFromClassType(t, isJs, context, /*reportErrors*/ false); } : function (t) { return getJsxPropsTypeFromCallSignature(t, context); }), 0 /* None */);
         }
         function getJsxPropsTypeFromCallSignature(sig, context) {
             var propsType = getTypeOfFirstParameterOfSignatureWithFallback(sig, emptyObjectType);
@@ -35416,20 +43440,26 @@ var ts;
         function getJsxPropsTypeFromClassType(sig, isJs, context, reportErrors) {
             var forcedLookupLocation = getJsxElementPropertiesName(getJsxNamespaceAt(context));
             var attributesType = forcedLookupLocation === undefined
+                // If there is no type ElementAttributesProperty, return the type of the first parameter of the signature, which should be the props type
                 ? getTypeOfFirstParameterOfSignatureWithFallback(sig, emptyObjectType)
                 : forcedLookupLocation === ""
+                    // If there is no e.g. 'props' member in ElementAttributesProperty, use the element class type instead
                     ? getReturnTypeOfSignature(sig)
+                    // Otherwise get the type of the property on the signature return type
                     : getJsxPropsTypeForSignatureFromMember(sig, forcedLookupLocation);
             if (!attributesType) {
+                // There is no property named 'props' on this instance type
                 if (reportErrors && !!forcedLookupLocation && !!ts.length(context.attributes.properties)) {
                     error(context, ts.Diagnostics.JSX_element_class_does_not_support_attributes_because_it_does_not_have_a_0_property, ts.unescapeLeadingUnderscores(forcedLookupLocation));
                 }
                 return emptyObjectType;
             }
             else if (isTypeAny(attributesType)) {
+                // Props is of type 'any' or unknown
                 return attributesType;
             }
             else {
+                // Normal case -- add in IntrinsicClassElements<T> and IntrinsicElements
                 var apparentAttributesType = attributesType;
                 var intrinsicClassAttribs = getJsxType(JsxNames.IntrinsicClassAttributes, context);
                 if (intrinsicClassAttribs !== errorType) {
@@ -35446,8 +43476,10 @@ var ts;
                 return apparentAttributesType;
             }
         }
+        // If the given type is an object or union type with a single signature, and if that signature has at
+        // least as many parameters as the given function, return the signature. Otherwise return undefined.
         function getContextualCallSignature(type, node) {
-            var signatures = getSignaturesOfType(type, 0);
+            var signatures = getSignaturesOfType(type, 0 /* Call */);
             if (signatures.length === 1) {
                 var signature = signatures[0];
                 if (!isAritySmaller(signature, node)) {
@@ -35455,6 +43487,7 @@ var ts;
                 }
             }
         }
+        /** If the contextual signature has fewer parameters than the function expression, do not use it */
         function isAritySmaller(signature, target) {
             var targetParameterCount = 0;
             for (; targetParameterCount < target.parameters.length; targetParameterCount++) {
@@ -35470,9 +43503,10 @@ var ts;
             return sourceLength < targetParameterCount;
         }
         function isFunctionExpressionOrArrowFunction(node) {
-            return node.kind === 192 || node.kind === 193;
+            return node.kind === 192 /* FunctionExpression */ || node.kind === 193 /* ArrowFunction */;
         }
         function getContextualSignatureForFunctionLikeDeclaration(node) {
+            // Only function expressions, arrow functions, and object literal methods are contextually typed.
             return isFunctionExpressionOrArrowFunction(node) || ts.isObjectLiteralMethod(node)
                 ? getContextualSignature(node)
                 : undefined;
@@ -35482,8 +43516,13 @@ var ts;
                 getContextualTypeForObjectLiteralMethod(node) :
                 getApparentTypeOfContextualType(node);
         }
+        // Return the contextual signature for a given expression node. A contextual type provides a
+        // contextual signature if it has a single call signature and if that call signature is non-generic.
+        // If the contextual type is a union type, get the signature from each type possible and if they are
+        // all identical ignoring their return type, the result is same signature but with return type as
+        // union type of return types from these signatures
         function getContextualSignature(node) {
-            ts.Debug.assert(node.kind !== 154 || ts.isObjectLiteralMethod(node));
+            ts.Debug.assert(node.kind !== 154 /* MethodDeclaration */ || ts.isObjectLiteralMethod(node));
             var type;
             if (ts.isInJavaScriptFile(node)) {
                 var jsdoc = ts.getJSDocType(node);
@@ -35497,7 +43536,7 @@ var ts;
             if (!type) {
                 return undefined;
             }
-            if (!(type.flags & 262144)) {
+            if (!(type.flags & 262144 /* Union */)) {
                 return getContextualCallSignature(type, node);
             }
             var signatureList;
@@ -35507,16 +43546,20 @@ var ts;
                 var signature = getContextualCallSignature(current, node);
                 if (signature) {
                     if (!signatureList) {
+                        // This signature will contribute to contextual union signature
                         signatureList = [signature];
                     }
-                    else if (!compareSignaturesIdentical(signatureList[0], signature, false, true, true, compareTypesIdentical)) {
+                    else if (!compareSignaturesIdentical(signatureList[0], signature, /*partialMatch*/ false, /*ignoreThisTypes*/ true, /*ignoreReturnTypes*/ true, compareTypesIdentical)) {
+                        // Signatures aren't identical, do not use
                         return undefined;
                     }
                     else {
+                        // Use this signature for contextual union signature
                         signatureList.push(signature);
                     }
                 }
             }
+            // Result is union of signatures collected (return type is union of return types of this signature set)
             var result;
             if (signatureList) {
                 result = cloneSignature(signatureList[0]);
@@ -35525,15 +43568,15 @@ var ts;
             return result;
         }
         function checkSpreadExpression(node, checkMode) {
-            if (languageVersion < 2 && compilerOptions.downlevelIteration) {
-                checkExternalEmitHelpers(node, 1536);
+            if (languageVersion < 2 /* ES2015 */ && compilerOptions.downlevelIteration) {
+                checkExternalEmitHelpers(node, 1536 /* SpreadIncludes */);
             }
             var arrayOrIterableType = checkExpression(node.expression, checkMode);
-            return checkIteratedTypeOrElementType(arrayOrIterableType, node.expression, false, false);
+            return checkIteratedTypeOrElementType(arrayOrIterableType, node.expression, /*allowStringInput*/ false, /*allowAsyncIterables*/ false);
         }
         function hasDefaultValue(node) {
-            return (node.kind === 182 && !!node.initializer) ||
-                (node.kind === 200 && node.operatorToken.kind === 58);
+            return (node.kind === 182 /* BindingElement */ && !!node.initializer) ||
+                (node.kind === 200 /* BinaryExpression */ && node.operatorToken.kind === 58 /* EqualsToken */);
         }
         function checkArrayLiteral(node, checkMode) {
             var elements = node.elements;
@@ -35543,10 +43586,22 @@ var ts;
             var contextualType = getApparentTypeOfContextualType(node);
             for (var index = 0; index < elements.length; index++) {
                 var e = elements[index];
-                if (inDestructuringPattern && e.kind === 204) {
+                if (inDestructuringPattern && e.kind === 204 /* SpreadElement */) {
+                    // Given the following situation:
+                    //    var c: {};
+                    //    [...c] = ["", 0];
+                    //
+                    // c is represented in the tree as a spread element in an array literal.
+                    // But c really functions as a rest element, and its purpose is to provide
+                    // a contextual type for the right hand side of the assignment. Therefore,
+                    // instead of calling checkExpression on "...c", which will give an error
+                    // if c is not iterable/array-like, we need to act as if we are trying to
+                    // get the contextual element type from it. So we do something similar to
+                    // getContextualTypeForElementExpression, which will crucially not error
+                    // if there is no index type / iterated type.
                     var restArrayType = checkExpression(e.expression, checkMode);
-                    var restElementType = getIndexTypeOfType(restArrayType, 1) ||
-                        getIteratedTypeOrElementType(restArrayType, undefined, false, false, false);
+                    var restElementType = getIndexTypeOfType(restArrayType, 1 /* Number */) ||
+                        getIteratedTypeOrElementType(restArrayType, /*errorNode*/ undefined, /*allowStringInput*/ false, /*allowAsyncIterables*/ false, /*checkAssignability*/ false);
                     if (restElementType) {
                         elementTypes.push(restElementType);
                     }
@@ -35556,9 +43611,11 @@ var ts;
                     var type = checkExpressionForMutableLocation(e, checkMode, elementContextualType);
                     elementTypes.push(type);
                 }
-                hasSpreadElement = hasSpreadElement || e.kind === 204;
+                hasSpreadElement = hasSpreadElement || e.kind === 204 /* SpreadElement */;
             }
             if (!hasSpreadElement) {
+                // If array literal is actually a destructuring pattern, mark it as an implied type. We do this such
+                // that we get the same behavior for "var [x, y] = []" and "[x, y] = []".
                 if (inDestructuringPattern && elementTypes.length) {
                     var type = cloneTypeReference(createTupleType(elementTypes));
                     type.pattern = node;
@@ -35566,7 +43623,9 @@ var ts;
                 }
                 if (contextualType && contextualTypeIsTupleLikeType(contextualType)) {
                     var pattern = contextualType.pattern;
-                    if (pattern && (pattern.kind === 181 || pattern.kind === 183)) {
+                    // If array literal is contextually typed by a binding pattern or an assignment pattern, pad the resulting
+                    // tuple type with the corresponding binding or assignment element types to make the lengths equal.
+                    if (pattern && (pattern.kind === 181 /* ArrayBindingPattern */ || pattern.kind === 183 /* ArrayLiteralExpression */)) {
                         var patternElements = pattern.elements;
                         for (var i = elementTypes.length; i < patternElements.length; i++) {
                             var patternElement = patternElements[i];
@@ -35574,7 +43633,7 @@ var ts;
                                 elementTypes.push(contextualType.typeArguments[i]);
                             }
                             else {
-                                if (patternElement.kind !== 206) {
+                                if (patternElement.kind !== 206 /* OmittedExpression */) {
                                     error(patternElement, ts.Diagnostics.Initializer_provides_no_value_for_this_binding_element_and_the_binding_element_has_no_default_value);
                                 }
                                 elementTypes.push(strictNullChecks ? implicitNeverType : undefinedWideningType);
@@ -35587,42 +43646,67 @@ var ts;
                 }
             }
             return createArrayType(elementTypes.length ?
-                getUnionType(elementTypes, 2) :
+                getUnionType(elementTypes, 2 /* Subtype */) :
                 strictNullChecks ? implicitNeverType : undefinedWideningType);
         }
         function isNumericName(name) {
             switch (name.kind) {
-                case 147:
+                case 147 /* ComputedPropertyName */:
                     return isNumericComputedName(name);
-                case 71:
+                case 71 /* Identifier */:
                     return isNumericLiteralName(name.escapedText);
-                case 8:
-                case 9:
+                case 8 /* NumericLiteral */:
+                case 9 /* StringLiteral */:
                     return isNumericLiteralName(name.text);
                 default:
                     return false;
             }
         }
         function isNumericComputedName(name) {
-            return isTypeAssignableToKind(checkComputedPropertyName(name), 168);
+            // It seems odd to consider an expression of type Any to result in a numeric name,
+            // but this behavior is consistent with checkIndexedAccess
+            return isTypeAssignableToKind(checkComputedPropertyName(name), 168 /* NumberLike */);
         }
         function isInfinityOrNaNString(name) {
             return name === "Infinity" || name === "-Infinity" || name === "NaN";
         }
         function isNumericLiteralName(name) {
+            // The intent of numeric names is that
+            //     - they are names with text in a numeric form, and that
+            //     - setting properties/indexing with them is always equivalent to doing so with the numeric literal 'numLit',
+            //         acquired by applying the abstract 'ToNumber' operation on the name's text.
+            //
+            // The subtlety is in the latter portion, as we cannot reliably say that anything that looks like a numeric literal is a numeric name.
+            // In fact, it is the case that the text of the name must be equal to 'ToString(numLit)' for this to hold.
+            //
+            // Consider the property name '"0xF00D"'. When one indexes with '0xF00D', they are actually indexing with the value of 'ToString(0xF00D)'
+            // according to the ECMAScript specification, so it is actually as if the user indexed with the string '"61453"'.
+            // Thus, the text of all numeric literals equivalent to '61543' such as '0xF00D', '0xf00D', '0170015', etc. are not valid numeric names
+            // because their 'ToString' representation is not equal to their original text.
+            // This is motivated by ECMA-262 sections 9.3.1, 9.8.1, 11.1.5, and 11.2.1.
+            //
+            // Here, we test whether 'ToString(ToNumber(name))' is exactly equal to 'name'.
+            // The '+' prefix operator is equivalent here to applying the abstract ToNumber operation.
+            // Applying the 'toString()' method on a number gives us the abstract ToString operation on a number.
+            //
+            // Note that this accepts the values 'Infinity', '-Infinity', and 'NaN', and that this is intentional.
+            // This is desired behavior, because when indexing with them as numeric entities, you are indexing
+            // with the strings '"Infinity"', '"-Infinity"', and '"NaN"' respectively.
             return (+name).toString() === name;
         }
         function checkComputedPropertyName(node) {
             var links = getNodeLinks(node.expression);
             if (!links.resolvedType) {
                 links.resolvedType = checkExpression(node.expression);
-                if (links.resolvedType.flags & 24576 ||
-                    !isTypeAssignableToKind(links.resolvedType, 68 | 168 | 3072) &&
+                // This will allow types number, string, symbol or any. It will also allow enums, the unknown
+                // type, and any union of these types (like string | number).
+                if (links.resolvedType.flags & 24576 /* Nullable */ ||
+                    !isTypeAssignableToKind(links.resolvedType, 68 /* StringLike */ | 168 /* NumberLike */ | 3072 /* ESSymbolLike */) &&
                         !isTypeAssignableTo(links.resolvedType, stringNumberSymbolType)) {
                     error(node, ts.Diagnostics.A_computed_property_name_must_be_of_type_string_number_symbol_or_any);
                 }
                 else {
-                    checkThatExpressionIsProperSymbolReference(node.expression, links.resolvedType, true);
+                    checkThatExpressionIsProperSymbolReference(node.expression, links.resolvedType, /*reportError*/ true);
                 }
             }
             return links.resolvedType;
@@ -35630,23 +43714,24 @@ var ts;
         function getObjectLiteralIndexInfo(propertyNodes, offset, properties, kind) {
             var propTypes = [];
             for (var i = 0; i < properties.length; i++) {
-                if (kind === 0 || isNumericName(propertyNodes[i + offset].name)) {
+                if (kind === 0 /* String */ || isNumericName(propertyNodes[i + offset].name)) {
                     propTypes.push(getTypeOfSymbol(properties[i]));
                 }
             }
-            var unionType = propTypes.length ? getUnionType(propTypes, 2) : undefinedType;
-            return createIndexInfo(unionType, false);
+            var unionType = propTypes.length ? getUnionType(propTypes, 2 /* Subtype */) : undefinedType;
+            return createIndexInfo(unionType, /*isReadonly*/ false);
         }
         function checkObjectLiteral(node, checkMode) {
             var inDestructuringPattern = ts.isAssignmentTarget(node);
+            // Grammar checking
             checkGrammarObjectLiteralExpression(node, inDestructuringPattern);
             var propertiesTable;
             var propertiesArray = [];
             var spread = emptyObjectType;
-            var propagatedFlags = 33554432;
+            var propagatedFlags = 33554432 /* FreshLiteral */;
             var contextualType = getApparentTypeOfContextualType(node);
             var contextualTypeHasPattern = contextualType && contextualType.pattern &&
-                (contextualType.pattern.kind === 180 || contextualType.pattern.kind === 184);
+                (contextualType.pattern.kind === 180 /* ObjectBindingPattern */ || contextualType.pattern.kind === 184 /* ObjectLiteralExpression */);
             var isInJSFile = ts.isInJavaScriptFile(node) && !ts.isInJsonFile(node);
             var isJSObjectLiteral = !contextualType && isInJSFile;
             var typeFlags = 0;
@@ -35656,10 +43741,11 @@ var ts;
             if (isInJSFile) {
                 var decl = ts.getDeclarationOfJSInitializer(node);
                 if (decl) {
-                    var symbol = getMergedSymbol(decl.symbol);
+                    // a JS object literal whose declaration's symbol has exports is a JS namespace
+                    var symbol = getSymbolOfNode(decl);
                     if (symbol && ts.hasEntries(symbol.exports)) {
                         propertiesTable = symbol.exports;
-                        symbol.exports.forEach(function (symbol) { return propertiesArray.push(getMergedSymbol(symbol)); });
+                        symbol.exports.forEach(function (s) { return propertiesArray.push(getMergedSymbol(s)); });
                         return createObjectLiteralType();
                     }
                 }
@@ -35669,13 +43755,13 @@ var ts;
             for (var i = 0; i < node.properties.length; i++) {
                 var memberDecl = node.properties[i];
                 var member = getSymbolOfNode(memberDecl);
-                var computedNameType = memberDecl.name && memberDecl.name.kind === 147 && !ts.isWellKnownSymbolSyntactically(memberDecl.name.expression) ?
+                var computedNameType = memberDecl.name && memberDecl.name.kind === 147 /* ComputedPropertyName */ && !ts.isWellKnownSymbolSyntactically(memberDecl.name.expression) ?
                     checkComputedPropertyName(memberDecl.name) : undefined;
-                if (memberDecl.kind === 270 ||
-                    memberDecl.kind === 271 ||
+                if (memberDecl.kind === 270 /* PropertyAssignment */ ||
+                    memberDecl.kind === 271 /* ShorthandPropertyAssignment */ ||
                     ts.isObjectLiteralMethod(memberDecl)) {
-                    var type = memberDecl.kind === 270 ? checkPropertyAssignment(memberDecl, checkMode) :
-                        memberDecl.kind === 271 ? checkExpressionForMutableLocation(memberDecl.name, checkMode) :
+                    var type = memberDecl.kind === 270 /* PropertyAssignment */ ? checkPropertyAssignment(memberDecl, checkMode) :
+                        memberDecl.kind === 271 /* ShorthandPropertyAssignment */ ? checkExpressionForMutableLocation(memberDecl.name, checkMode) :
                             checkObjectLiteralMethod(memberDecl, checkMode);
                     if (isInJSFile) {
                         var jsDocType = getTypeForDeclarationFromJSDocComment(memberDecl);
@@ -35685,27 +43771,31 @@ var ts;
                         }
                     }
                     typeFlags |= type.flags;
-                    var nameType = computedNameType && computedNameType.flags & 2240 ?
+                    var nameType = computedNameType && computedNameType.flags & 2240 /* StringOrNumberLiteralOrUnique */ ?
                         computedNameType : undefined;
                     var prop = nameType ?
-                        createSymbol(4 | member.flags, getLateBoundNameFromType(nameType), 1024) :
-                        createSymbol(4 | member.flags, member.escapedName);
+                        createSymbol(4 /* Property */ | member.flags, getLateBoundNameFromType(nameType), 1024 /* Late */) :
+                        createSymbol(4 /* Property */ | member.flags, member.escapedName);
                     if (nameType) {
                         prop.nameType = nameType;
                     }
                     if (inDestructuringPattern) {
-                        var isOptional = (memberDecl.kind === 270 && hasDefaultValue(memberDecl.initializer)) ||
-                            (memberDecl.kind === 271 && memberDecl.objectAssignmentInitializer);
+                        // If object literal is an assignment pattern and if the assignment pattern specifies a default value
+                        // for the property, make the property optional.
+                        var isOptional = (memberDecl.kind === 270 /* PropertyAssignment */ && hasDefaultValue(memberDecl.initializer)) ||
+                            (memberDecl.kind === 271 /* ShorthandPropertyAssignment */ && memberDecl.objectAssignmentInitializer);
                         if (isOptional) {
-                            prop.flags |= 16777216;
+                            prop.flags |= 16777216 /* Optional */;
                         }
                     }
-                    else if (contextualTypeHasPattern && !(ts.getObjectFlags(contextualType) & 512)) {
+                    else if (contextualTypeHasPattern && !(ts.getObjectFlags(contextualType) & 512 /* ObjectLiteralPatternWithComputedProperties */)) {
+                        // If object literal is contextually typed by the implied type of a binding pattern, and if the
+                        // binding pattern specifies a default value for the property, make the property optional.
                         var impliedProp = getPropertyOfType(contextualType, member.escapedName);
                         if (impliedProp) {
-                            prop.flags |= impliedProp.flags & 16777216;
+                            prop.flags |= impliedProp.flags & 16777216 /* Optional */;
                         }
-                        else if (!compilerOptions.suppressExcessPropertyErrors && !getIndexInfoOfType(contextualType, 0)) {
+                        else if (!compilerOptions.suppressExcessPropertyErrors && !getIndexInfoOfType(contextualType, 0 /* String */)) {
                             error(memberDecl.name, ts.Diagnostics.Object_literal_may_only_specify_known_properties_and_0_does_not_exist_in_type_1, symbolToString(member), typeToString(contextualType));
                         }
                     }
@@ -35718,12 +43808,12 @@ var ts;
                     prop.target = member;
                     member = prop;
                 }
-                else if (memberDecl.kind === 272) {
-                    if (languageVersion < 2) {
-                        checkExternalEmitHelpers(memberDecl, 2);
+                else if (memberDecl.kind === 272 /* SpreadAssignment */) {
+                    if (languageVersion < 2 /* ES2015 */) {
+                        checkExternalEmitHelpers(memberDecl, 2 /* Assign */);
                     }
                     if (propertiesArray.length > 0) {
-                        spread = getSpreadType(spread, createObjectLiteralType(), node.symbol, propagatedFlags, 0);
+                        spread = getSpreadType(spread, createObjectLiteralType(), node.symbol, propagatedFlags, /*objectFlags*/ 0);
                         propertiesArray = [];
                         propertiesTable = ts.createSymbolTable();
                         hasComputedStringProperty = false;
@@ -35735,15 +43825,20 @@ var ts;
                         error(memberDecl, ts.Diagnostics.Spread_types_may_only_be_created_from_object_types);
                         return errorType;
                     }
-                    spread = getSpreadType(spread, type, node.symbol, propagatedFlags, 0);
+                    spread = getSpreadType(spread, type, node.symbol, propagatedFlags, /*objectFlags*/ 0);
                     offset = i + 1;
                     continue;
                 }
                 else {
-                    ts.Debug.assert(memberDecl.kind === 156 || memberDecl.kind === 157);
+                    // TypeScript 1.0 spec (April 2014)
+                    // A get accessor declaration is processed in the same manner as
+                    // an ordinary function declaration(section 6.1) with no parameters.
+                    // A set accessor declaration is processed in the same manner
+                    // as an ordinary function declaration with a single parameter and a Void return type.
+                    ts.Debug.assert(memberDecl.kind === 156 /* GetAccessor */ || memberDecl.kind === 157 /* SetAccessor */);
                     checkNodeDeferred(memberDecl);
                 }
-                if (computedNameType && !(computedNameType.flags & 2240)) {
+                if (computedNameType && !(computedNameType.flags & 2240 /* StringOrNumberLiteralOrUnique */)) {
                     if (isTypeAssignableTo(computedNameType, stringNumberSymbolType)) {
                         if (isTypeAssignableTo(computedNameType, numberType)) {
                             hasComputedNumberProperty = true;
@@ -35761,11 +43856,13 @@ var ts;
                 }
                 propertiesArray.push(member);
             }
+            // If object literal is contextually typed by the implied type of a binding pattern, augment the result
+            // type with those properties for which the binding pattern specifies a default value.
             if (contextualTypeHasPattern) {
                 for (var _i = 0, _a = getPropertiesOfType(contextualType); _i < _a.length; _i++) {
                     var prop = _a[_i];
                     if (!propertiesTable.get(prop.escapedName) && !(spread && getPropertyOfType(spread, prop.escapedName))) {
-                        if (!(prop.flags & 16777216)) {
+                        if (!(prop.flags & 16777216 /* Optional */)) {
                             error(prop.valueDeclaration || prop.bindingElement, ts.Diagnostics.Initializer_provides_no_value_for_this_binding_element_and_the_binding_element_has_no_default_value);
                         }
                         propertiesTable.set(prop.escapedName, prop);
@@ -35775,42 +43872,44 @@ var ts;
             }
             if (spread !== emptyObjectType) {
                 if (propertiesArray.length > 0) {
-                    spread = getSpreadType(spread, createObjectLiteralType(), node.symbol, propagatedFlags, 0);
+                    spread = getSpreadType(spread, createObjectLiteralType(), node.symbol, propagatedFlags, /*objectFlags*/ 0);
                 }
                 return spread;
             }
             return createObjectLiteralType();
             function createObjectLiteralType() {
-                var stringIndexInfo = isJSObjectLiteral ? jsObjectLiteralIndexInfo : hasComputedStringProperty ? getObjectLiteralIndexInfo(node.properties, offset, propertiesArray, 0) : undefined;
-                var numberIndexInfo = hasComputedNumberProperty && !isJSObjectLiteral ? getObjectLiteralIndexInfo(node.properties, offset, propertiesArray, 1) : undefined;
+                var stringIndexInfo = isJSObjectLiteral ? jsObjectLiteralIndexInfo : hasComputedStringProperty ? getObjectLiteralIndexInfo(node.properties, offset, propertiesArray, 0 /* String */) : undefined;
+                var numberIndexInfo = hasComputedNumberProperty && !isJSObjectLiteral ? getObjectLiteralIndexInfo(node.properties, offset, propertiesArray, 1 /* Number */) : undefined;
                 var result = createAnonymousType(node.symbol, propertiesTable, ts.emptyArray, ts.emptyArray, stringIndexInfo, numberIndexInfo);
-                var freshObjectLiteralFlag = compilerOptions.suppressExcessPropertyErrors ? 0 : 33554432;
-                result.flags |= 268435456 | freshObjectLiteralFlag | (typeFlags & 939524096);
-                result.objectFlags |= 128;
+                var freshObjectLiteralFlag = compilerOptions.suppressExcessPropertyErrors ? 0 : 33554432 /* FreshLiteral */;
+                result.flags |= 268435456 /* ContainsObjectLiteral */ | freshObjectLiteralFlag | (typeFlags & 939524096 /* PropagatingFlags */);
+                result.objectFlags |= 128 /* ObjectLiteral */;
                 if (patternWithComputedProperties) {
-                    result.objectFlags |= 512;
+                    result.objectFlags |= 512 /* ObjectLiteralPatternWithComputedProperties */;
                 }
                 if (inDestructuringPattern) {
                     result.pattern = node;
                 }
-                if (!(result.flags & 24576)) {
-                    propagatedFlags |= (result.flags & 939524096);
+                if (!(result.flags & 24576 /* Nullable */)) {
+                    propagatedFlags |= (result.flags & 939524096 /* PropagatingFlags */);
                 }
                 return result;
             }
         }
         function isValidSpreadType(type) {
-            return !!(type.flags & (3 | 16777216) ||
-                getFalsyFlags(type) & 29120 && isValidSpreadType(removeDefinitelyFalsyTypes(type)) ||
-                type.flags & 131072 && !isGenericMappedType(type) ||
-                type.flags & 786432 && !ts.forEach(type.types, function (t) { return !isValidSpreadType(t); }));
+            return !!(type.flags & (3 /* AnyOrUnknown */ | 16777216 /* NonPrimitive */) ||
+                getFalsyFlags(type) & 29120 /* DefinitelyFalsy */ && isValidSpreadType(removeDefinitelyFalsyTypes(type)) ||
+                type.flags & 131072 /* Object */ && !isGenericMappedType(type) ||
+                type.flags & 786432 /* UnionOrIntersection */ && ts.every(type.types, isValidSpreadType));
         }
         function checkJsxSelfClosingElement(node, checkMode) {
             checkJsxOpeningLikeElementOrOpeningFragment(node, checkMode);
             return getJsxElementTypeAt(node) || anyType;
         }
         function checkJsxElement(node, checkMode) {
+            // Check attributes
             checkJsxOpeningLikeElementOrOpeningFragment(node.openingElement, checkMode);
+            // Perform resolution on the closing tag so that rename/go to definition/etc work
             if (isJsxIntrinsicIdentifier(node.closingElement.tagName)) {
                 getIntrinsicTagSymbol(node.closingElement);
             }
@@ -35821,22 +43920,30 @@ var ts;
         }
         function checkJsxFragment(node, checkMode) {
             checkJsxOpeningLikeElementOrOpeningFragment(node.openingFragment, checkMode);
-            if (compilerOptions.jsx === 2 && (compilerOptions.jsxFactory || ts.getSourceFileOfNode(node).pragmas.has("jsx"))) {
+            if (compilerOptions.jsx === 2 /* React */ && (compilerOptions.jsxFactory || ts.getSourceFileOfNode(node).pragmas.has("jsx"))) {
                 error(node, compilerOptions.jsxFactory
                     ? ts.Diagnostics.JSX_fragment_is_not_supported_when_using_jsxFactory
                     : ts.Diagnostics.JSX_fragment_is_not_supported_when_using_an_inline_JSX_factory_pragma);
             }
             return getJsxElementTypeAt(node) || anyType;
         }
+        /**
+         * Returns true iff the JSX element name would be a valid JS identifier, ignoring restrictions about keywords not being identifiers
+         */
         function isUnhyphenatedJsxName(name) {
+            // - is the only character supported in JSX attribute names that isn't valid in JavaScript identifiers
             return !ts.stringContains(name, "-");
         }
+        /**
+         * Returns true iff React would emit this tag name as a string rather than an identifier or qualified name
+         */
         function isJsxIntrinsicIdentifier(tagName) {
+            // TODO (yuisu): comment
             switch (tagName.kind) {
-                case 185:
-                case 99:
+                case 185 /* PropertyAccessExpression */:
+                case 99 /* ThisKeyword */:
                     return false;
-                case 71:
+                case 71 /* Identifier */:
                     return ts.isIntrinsicJsxName(tagName.escapedText);
                 default:
                     return ts.Debug.fail();
@@ -35845,8 +43952,17 @@ var ts;
         function checkJsxAttribute(node, checkMode) {
             return node.initializer
                 ? checkExpressionForMutableLocation(node.initializer, checkMode)
-                : trueType;
+                : trueType; // <Elem attr /> is sugar for <Elem attr={true} />
         }
+        /**
+         * Get attributes type of the JSX opening-like element. The result is from resolving "attributes" property of the opening-like element.
+         *
+         * @param openingLikeElement a JSX opening-like element
+         * @param filter a function to remove attributes that will not participate in checking whether attributes are assignable
+         * @return an anonymous type (similar to the one returned by checkObjectLiteral) in which its properties are attributes property.
+         * @remarks Because this function calls getSpreadType, it needs to use the same checks as checkObjectLiteral,
+         * which also calls getSpreadType.
+         */
         function createJsxAttributesTypeFromAttributesProperty(openingLikeElement, checkMode) {
             var attributes = openingLikeElement.attributes;
             var attributesTable = ts.createSymbolTable();
@@ -35860,7 +43976,7 @@ var ts;
                 var member = attributeDecl.symbol;
                 if (ts.isJsxAttribute(attributeDecl)) {
                     var exprType = checkJsxAttribute(attributeDecl, checkMode);
-                    var attributeSymbol = createSymbol(4 | 33554432 | member.flags, member.escapedName);
+                    var attributeSymbol = createSymbol(4 /* Property */ | 33554432 /* Transient */ | member.flags, member.escapedName);
                     attributeSymbol.declarations = member.declarations;
                     attributeSymbol.parent = member.parent;
                     if (member.valueDeclaration) {
@@ -35874,9 +43990,9 @@ var ts;
                     }
                 }
                 else {
-                    ts.Debug.assert(attributeDecl.kind === 264);
+                    ts.Debug.assert(attributeDecl.kind === 264 /* JsxSpreadAttribute */);
                     if (attributesTable.size > 0) {
-                        spread = getSpreadType(spread, createJsxAttributesType(), attributes.symbol, 0, 4096);
+                        spread = getSpreadType(spread, createJsxAttributesType(), attributes.symbol, /*typeFlags*/ 0, 4096 /* JsxAttributes */);
                         attributesTable = ts.createSymbolTable();
                     }
                     var exprType = checkExpressionCached(attributeDecl.expression, checkMode);
@@ -35884,7 +44000,7 @@ var ts;
                         hasSpreadAnyType = true;
                     }
                     if (isValidSpreadType(exprType)) {
-                        spread = getSpreadType(spread, exprType, openingLikeElement.symbol, 0, 4096);
+                        spread = getSpreadType(spread, exprType, openingLikeElement.symbol, /*typeFlags*/ 0, 4096 /* JsxAttributes */);
                     }
                     else {
                         typeToIntersect = typeToIntersect ? getIntersectionType([typeToIntersect, exprType]) : exprType;
@@ -35893,23 +44009,29 @@ var ts;
             }
             if (!hasSpreadAnyType) {
                 if (attributesTable.size > 0) {
-                    spread = getSpreadType(spread, createJsxAttributesType(), attributes.symbol, 0, 4096);
+                    spread = getSpreadType(spread, createJsxAttributesType(), attributes.symbol, /*typeFlags*/ 0, 4096 /* JsxAttributes */);
                 }
             }
-            var parent = openingLikeElement.parent.kind === 255 ? openingLikeElement.parent : undefined;
+            // Handle children attribute
+            var parent = openingLikeElement.parent.kind === 255 /* JsxElement */ ? openingLikeElement.parent : undefined;
+            // We have to check that openingElement of the parent is the one we are visiting as this may not be true for selfClosingElement
             if (parent && parent.openingElement === openingLikeElement && parent.children.length > 0) {
                 var childrenTypes = checkJsxChildren(parent, checkMode);
                 if (!hasSpreadAnyType && jsxChildrenPropertyName && jsxChildrenPropertyName !== "") {
+                    // Error if there is a attribute named "children" explicitly specified and children element.
+                    // This is because children element will overwrite the value from attributes.
+                    // Note: we will not warn "children" attribute overwritten if "children" attribute is specified in object spread.
                     if (explicitlySpecifyChildrenAttribute) {
                         error(attributes, ts.Diagnostics._0_are_specified_twice_The_attribute_named_0_will_be_overwritten, ts.unescapeLeadingUnderscores(jsxChildrenPropertyName));
                     }
-                    var childrenPropSymbol = createSymbol(4 | 33554432, jsxChildrenPropertyName);
+                    // If there are children in the body of JSX element, create dummy attribute "children" with the union of children types so that it will pass the attribute checking process
+                    var childrenPropSymbol = createSymbol(4 /* Property */ | 33554432 /* Transient */, jsxChildrenPropertyName);
                     childrenPropSymbol.type = childrenTypes.length === 1 ?
                         childrenTypes[0] :
                         createArrayType(getUnionType(childrenTypes));
                     var childPropMap = ts.createSymbolTable();
                     childPropMap.set(jsxChildrenPropertyName, childrenPropSymbol);
-                    spread = getSpreadType(spread, createAnonymousType(attributes.symbol, childPropMap, ts.emptyArray, ts.emptyArray, undefined, undefined), attributes.symbol, 0, 4096);
+                    spread = getSpreadType(spread, createAnonymousType(attributes.symbol, childPropMap, ts.emptyArray, ts.emptyArray, /*stringIndexInfo*/ undefined, /*numberIndexInfo*/ undefined), attributes.symbol, /*typeFlags*/ 0, 4096 /* JsxAttributes */);
                 }
             }
             if (hasSpreadAnyType) {
@@ -35919,10 +44041,15 @@ var ts;
                 return getIntersectionType([typeToIntersect, spread]);
             }
             return typeToIntersect || (spread === emptyObjectType ? createJsxAttributesType() : spread);
+            /**
+             * Create anonymous type from given attributes symbol table.
+             * @param symbol a symbol of JsxAttributes containing attributes corresponding to attributesTable
+             * @param attributesTable a symbol table of attributes property
+             */
             function createJsxAttributesType() {
-                var result = createAnonymousType(attributes.symbol, attributesTable, ts.emptyArray, ts.emptyArray, undefined, undefined);
-                result.flags |= 268435456;
-                result.objectFlags |= 128 | 4096;
+                var result = createAnonymousType(attributes.symbol, attributesTable, ts.emptyArray, ts.emptyArray, /*stringIndexInfo*/ undefined, /*numberIndexInfo*/ undefined);
+                result.flags |= 268435456 /* ContainsObjectLiteral */;
+                result.objectFlags |= 128 /* ObjectLiteral */ | 4096 /* JsxAttributes */;
                 return result;
             }
         }
@@ -35930,7 +44057,9 @@ var ts;
             var childrenTypes = [];
             for (var _i = 0, _a = node.children; _i < _a.length; _i++) {
                 var child = _a[_i];
-                if (child.kind === 10) {
+                // In React, JSX text that contains only whitespaces will be ignored so we don't want to type-check that
+                // because then type of children property will have constituent of string type.
+                if (child.kind === 10 /* JsxText */) {
                     if (!child.containsOnlyWhiteSpaces) {
                         childrenTypes.push(stringType);
                     }
@@ -35941,32 +44070,46 @@ var ts;
             }
             return childrenTypes;
         }
+        /**
+         * Check attributes property of opening-like element. This function is called during chooseOverload to get call signature of a JSX opening-like element.
+         * (See "checkApplicableSignatureForJsxOpeningLikeElement" for how the function is used)
+         * @param node a JSXAttributes to be resolved of its type
+         */
         function checkJsxAttributes(node, checkMode) {
             return createJsxAttributesTypeFromAttributesProperty(node.parent, checkMode);
         }
         function getJsxType(name, location) {
             var namespace = getJsxNamespaceAt(location);
             var exports = namespace && getExportsOfSymbol(namespace);
-            var typeSymbol = exports && getSymbol(exports, name, 67901928);
+            var typeSymbol = exports && getSymbol(exports, name, 67901928 /* Type */);
             return typeSymbol ? getDeclaredTypeOfSymbol(typeSymbol) : errorType;
         }
+        /**
+         * Looks up an intrinsic tag name and returns a symbol that either points to an intrinsic
+         * property (in which case nodeLinks.jsxFlags will be IntrinsicNamedElement) or an intrinsic
+         * string index signature (in which case nodeLinks.jsxFlags will be IntrinsicIndexedElement).
+         * May also return unknownSymbol if both of these lookups fail.
+         */
         function getIntrinsicTagSymbol(node) {
             var links = getNodeLinks(node);
             if (!links.resolvedSymbol) {
                 var intrinsicElementsType = getJsxType(JsxNames.IntrinsicElements, node);
                 if (intrinsicElementsType !== errorType) {
+                    // Property case
                     if (!ts.isIdentifier(node.tagName))
                         return ts.Debug.fail();
                     var intrinsicProp = getPropertyOfType(intrinsicElementsType, node.tagName.escapedText);
                     if (intrinsicProp) {
-                        links.jsxFlags |= 1;
+                        links.jsxFlags |= 1 /* IntrinsicNamedElement */;
                         return links.resolvedSymbol = intrinsicProp;
                     }
-                    var indexSignatureType = getIndexTypeOfType(intrinsicElementsType, 0);
+                    // Intrinsic string indexer case
+                    var indexSignatureType = getIndexTypeOfType(intrinsicElementsType, 0 /* String */);
                     if (indexSignatureType) {
-                        links.jsxFlags |= 2;
+                        links.jsxFlags |= 2 /* IntrinsicIndexedElement */;
                         return links.resolvedSymbol = intrinsicElementsType.symbol;
                     }
+                    // Wasn't found
                     error(node, ts.Diagnostics.Property_0_does_not_exist_on_type_1, ts.idText(node.tagName), "JSX." + JsxNames.IntrinsicElements);
                     return links.resolvedSymbol = unknownSymbol;
                 }
@@ -35987,7 +44130,7 @@ var ts;
                 var signature = signatures_3[_i];
                 if (signature.typeParameters) {
                     var isJavascript = ts.isInJavaScriptFile(node);
-                    var typeArgumentInstantiated = getJsxSignatureTypeArgumentInstantiation(signature, node, isJavascript, false);
+                    var typeArgumentInstantiated = getJsxSignatureTypeArgumentInstantiation(signature, node, isJavascript, /*reportErrors*/ false);
                     if (typeArgumentInstantiated) {
                         hasTypeArgumentError = false;
                         instantiatedSignatures.push(typeArgumentInstantiated);
@@ -35996,7 +44139,7 @@ var ts;
                         if (node.typeArguments && hasCorrectTypeArgumentArity(signature, node.typeArguments)) {
                             candidateForTypeArgumentError = signature;
                         }
-                        var inferenceContext = createInferenceContext(signature.typeParameters, signature, isJavascript ? 4 : 0);
+                        var inferenceContext = createInferenceContext(signature.typeParameters, signature, /*flags*/ isJavascript ? 4 /* AnyDefault */ : 0 /* None */);
                         var typeArguments = inferJsxTypeArguments(signature, node, inferenceContext);
                         instantiatedSignatures.push(getSignatureInstantiation(signature, typeArguments, isJavascript));
                     }
@@ -36007,8 +44150,9 @@ var ts;
             }
             if (node.typeArguments && hasTypeArgumentError) {
                 if (candidateForTypeArgumentError) {
-                    checkTypeArguments(candidateForTypeArgumentError, node.typeArguments, true);
+                    checkTypeArguments(candidateForTypeArgumentError, node.typeArguments, /*reportErrors*/ true);
                 }
+                // Length check to avoid issuing an arity error on length=0, the "Type argument list cannot be empty" grammar error alone is fine
                 else if (node.typeArguments.length !== 0) {
                     diagnostics.add(getTypeArgumentArityError(node, signatures, node.typeArguments));
                 }
@@ -36031,32 +44175,52 @@ var ts;
         }
         function getJsxNamespaceAt(location) {
             var namespaceName = getJsxNamespace(location);
-            var resolvedNamespace = resolveName(location, namespaceName, 1920, undefined, namespaceName, false);
+            var resolvedNamespace = resolveName(location, namespaceName, 1920 /* Namespace */, /*diagnosticMessage*/ undefined, namespaceName, /*isUse*/ false);
             if (resolvedNamespace) {
-                var candidate = getSymbol(getExportsOfSymbol(resolveSymbol(resolvedNamespace)), JsxNames.JSX, 1920);
+                var candidate = getSymbol(getExportsOfSymbol(resolveSymbol(resolvedNamespace)), JsxNames.JSX, 1920 /* Namespace */);
                 if (candidate) {
                     return candidate;
                 }
             }
-            return getGlobalSymbol(JsxNames.JSX, 1920, undefined);
+            // JSX global fallback
+            return getGlobalSymbol(JsxNames.JSX, 1920 /* Namespace */, /*diagnosticMessage*/ undefined); // TODO: GH#18217
         }
+        /**
+         * Look into JSX namespace and then look for container with matching name as nameOfAttribPropContainer.
+         * Get a single property from that container if existed. Report an error if there are more than one property.
+         *
+         * @param nameOfAttribPropContainer a string of value JsxNames.ElementAttributesPropertyNameContainer or JsxNames.ElementChildrenAttributeNameContainer
+         *          if other string is given or the container doesn't exist, return undefined.
+         */
         function getNameFromJsxElementAttributesContainer(nameOfAttribPropContainer, jsxNamespace) {
-            var jsxElementAttribPropInterfaceSym = jsxNamespace && getSymbol(jsxNamespace.exports, nameOfAttribPropContainer, 67901928);
+            // JSX.ElementAttributesProperty | JSX.ElementChildrenAttribute [symbol]
+            var jsxElementAttribPropInterfaceSym = jsxNamespace && getSymbol(jsxNamespace.exports, nameOfAttribPropContainer, 67901928 /* Type */);
+            // JSX.ElementAttributesProperty | JSX.ElementChildrenAttribute [type]
             var jsxElementAttribPropInterfaceType = jsxElementAttribPropInterfaceSym && getDeclaredTypeOfSymbol(jsxElementAttribPropInterfaceSym);
+            // The properties of JSX.ElementAttributesProperty | JSX.ElementChildrenAttribute
             var propertiesOfJsxElementAttribPropInterface = jsxElementAttribPropInterfaceType && getPropertiesOfType(jsxElementAttribPropInterfaceType);
             if (propertiesOfJsxElementAttribPropInterface) {
+                // Element Attributes has zero properties, so the element attributes type will be the class instance type
                 if (propertiesOfJsxElementAttribPropInterface.length === 0) {
                     return "";
                 }
+                // Element Attributes has one property, so the element attributes type will be the type of the corresponding
+                // property of the class instance type
                 else if (propertiesOfJsxElementAttribPropInterface.length === 1) {
                     return propertiesOfJsxElementAttribPropInterface[0].escapedName;
                 }
                 else if (propertiesOfJsxElementAttribPropInterface.length > 1) {
+                    // More than one property on ElementAttributesProperty is an error
                     error(jsxElementAttribPropInterfaceSym.declarations[0], ts.Diagnostics.The_global_type_JSX_0_may_not_have_more_than_one_property, ts.unescapeLeadingUnderscores(nameOfAttribPropContainer));
                 }
             }
             return undefined;
         }
+        /// e.g. "props" for React.d.ts,
+        /// or 'undefined' if ElementAttributesProperty doesn't exist (which means all
+        ///     non-intrinsic elements' attributes type is 'any'),
+        /// or '' if it has 0 properties (which means every
+        ///     non-intrinsic elements' attributes type is the element instance type)
         function getJsxElementPropertiesName(jsxNamespace) {
             return getNameFromJsxElementAttributesContainer(JsxNames.ElementAttributesPropertyNameContainer, jsxNamespace);
         }
@@ -36067,7 +44231,7 @@ var ts;
             if (!propsType) {
                 return undefined;
             }
-            if (propsType.flags & 524288) {
+            if (propsType.flags & 524288 /* Intersection */) {
                 var propsApparentType = [];
                 for (var _i = 0, _a = propsType.types; _i < _a.length; _i++) {
                     var t = _a[_i];
@@ -36077,17 +44241,29 @@ var ts;
             }
             return getApparentType(propsType);
         }
+        /**
+         * Get JSX attributes type by trying to resolve openingLikeElement as a stateless function component.
+         * Return only attributes type of successfully resolved call signature.
+         * This function assumes that the caller handled other possible element type of the JSX element (e.g. stateful component)
+         * Unlike tryGetAllJsxStatelessFunctionAttributesType, this function is a default behavior of type-checkers.
+         * @param openingLikeElement a JSX opening-like element to find attributes type
+         * @param elementType a type of the opening-like element. This elementType can't be an union type
+         * @param elemInstanceType an element instance type (the result of newing or invoking this tag)
+         * @param elementClassType a JSX-ElementClass type. This is a result of looking up ElementClass interface in the JSX global
+         */
         function defaultTryGetJsxStatelessFunctionAttributesType(openingLikeElement, elementType, elemInstanceType, elementClassType) {
-            ts.Debug.assert(!(elementType.flags & 262144));
+            ts.Debug.assert(!(elementType.flags & 262144 /* Union */));
             if (!elementClassType || !isTypeAssignableTo(elemInstanceType, elementClassType)) {
                 var jsxStatelessElementType = getJsxStatelessElementTypeAt(openingLikeElement);
                 if (jsxStatelessElementType) {
-                    var callSignature = getResolvedJsxStatelessFunctionSignature(openingLikeElement, elementType, undefined);
+                    // We don't call getResolvedSignature here because we have already resolve the type of JSX Element.
+                    var callSignature = getResolvedJsxStatelessFunctionSignature(openingLikeElement, elementType, /*candidatesOutArray*/ undefined);
                     if (callSignature !== unknownSignature) {
                         var callReturnType = callSignature && getReturnTypeOfSignature(callSignature);
                         var paramType = callReturnType && (callSignature.parameters.length === 0 ? emptyObjectType : getTypeOfSymbol(callSignature.parameters[0]));
                         paramType = getApparentTypeOfJsxPropsType(paramType);
                         if (callReturnType && isTypeAssignableTo(callReturnType, jsxStatelessElementType)) {
+                            // Intersect in JSX.IntrinsicAttributes if it exists
                             var intrinsicAttributes = getJsxType(JsxNames.IntrinsicAttributes, openingLikeElement);
                             if (intrinsicAttributes !== errorType) {
                                 paramType = intersectTypes(intrinsicAttributes, paramType);
@@ -36099,11 +44275,23 @@ var ts;
             }
             return undefined;
         }
+        /**
+         * Get JSX attributes type by trying to resolve openingLikeElement as a stateless function component.
+         * Return all attributes type of resolved call signature including candidate signatures.
+         * This function assumes that the caller handled other possible element type of the JSX element.
+         * This function is a behavior used by language service when looking up completion in JSX element.
+         * @param openingLikeElement a JSX opening-like element to find attributes type
+         * @param elementType a type of the opening-like element. This elementType can't be an union type
+         * @param elemInstanceType an element instance type (the result of newing or invoking this tag)
+         * @param elementClassType a JSX-ElementClass type. This is a result of looking up ElementClass interface in the JSX global
+         */
         function tryGetAllJsxStatelessFunctionAttributesType(openingLikeElement, elementType, elemInstanceType, elementClassType) {
-            ts.Debug.assert(!(elementType.flags & 262144));
+            ts.Debug.assert(!(elementType.flags & 262144 /* Union */));
             if (!elementClassType || !isTypeAssignableTo(elemInstanceType, elementClassType)) {
+                // Is this is a stateless function component? See if its single signature's return type is assignable to the JSX Element Type
                 var jsxStatelessElementType = getJsxStatelessElementTypeAt(openingLikeElement);
                 if (jsxStatelessElementType) {
+                    // We don't call getResolvedSignature because here we have already resolve the type of JSX Element.
                     var candidatesOutArray = [];
                     getResolvedJsxStatelessFunctionSignature(openingLikeElement, elementType, candidatesOutArray);
                     var result = void 0;
@@ -36111,6 +44299,7 @@ var ts;
                     for (var _i = 0, candidatesOutArray_1 = candidatesOutArray; _i < candidatesOutArray_1.length; _i++) {
                         var candidate = candidatesOutArray_1[_i];
                         var callReturnType = getReturnTypeOfSignature(candidate);
+                        // TODO: GH#18217: callReturnType should always be defined...
                         var paramType = callReturnType && (candidate.parameters.length === 0 ? emptyObjectType : getTypeOfSymbol(candidate.parameters[0]));
                         paramType = getApparentTypeOfJsxPropsType(paramType);
                         if (callReturnType && isTypeAssignableTo(callReturnType, jsxStatelessElementType)) {
@@ -36119,7 +44308,7 @@ var ts;
                                 var attribute = _b[_a];
                                 if (ts.isJsxAttribute(attribute) &&
                                     isUnhyphenatedJsxName(attribute.name.escapedText) &&
-                                    !getPropertyOfType(paramType, attribute.name.escapedText)) {
+                                    !getPropertyOfType(paramType, attribute.name.escapedText)) { // TODO: GH#18217
                                     shouldBeCandidate = false;
                                     break;
                                 }
@@ -36130,9 +44319,11 @@ var ts;
                             allMatchingAttributesType = intersectTypes(allMatchingAttributesType, paramType);
                         }
                     }
+                    // If we can't find any matching, just return everything.
                     if (!result) {
                         result = allMatchingAttributesType;
                     }
+                    // Intersect in JSX.IntrinsicAttributes if it exists
                     var intrinsicAttributes = getJsxType(JsxNames.IntrinsicAttributes, openingLikeElement);
                     if (intrinsicAttributes !== errorType) {
                         result = intersectTypes(intrinsicAttributes, result);
@@ -36155,34 +44346,62 @@ var ts;
                 return links.resolvedSignatures.get(cacheKey);
             }
             links.resolvedSignatures.set(cacheKey, resolvingSignaturesArray);
-            var signatures = getSignaturesOfType(elementType, 1);
+            // Resolve the signatures, preferring constructor
+            var signatures = getSignaturesOfType(elementType, 1 /* Construct */);
             if (signatures.length === 0) {
-                signatures = getSignaturesOfType(elementType, 0);
+                // No construct signatures, try call signatures
+                signatures = getSignaturesOfType(elementType, 0 /* Call */);
                 if (signatures.length === 0) {
+                    // We found no signatures at all, which is an error
                     if (reportErrors) {
                         error(openingLikeElement.tagName, ts.Diagnostics.JSX_element_type_0_does_not_have_any_construct_or_call_signatures, ts.getTextOfNode(openingLikeElement.tagName));
                     }
                     return;
                 }
             }
+            // Instantiate in context of source type
             var results = instantiateJsxSignatures(openingLikeElement, signatures);
             links.resolvedSignatures.set(cacheKey, results);
             return results;
         }
+        /**
+         * Resolve attributes type of the given opening-like element. The attributes type is a type of attributes associated with the given elementType.
+         * For instance:
+         *      declare function Foo(attr: { p1: string}): JSX.Element;
+         *      <Foo p1={10} />;  // This function will try resolve "Foo" and return an attributes type of "Foo" which is "{ p1: string }"
+         *
+         * The function is intended to initially be called from getAttributesTypeFromJsxOpeningLikeElement which already handle JSX-intrinsic-element..
+         * This function will try to resolve custom JSX attributes type in following order: string literal, stateless function, and stateful component
+         *
+         * @param openingLikeElement a non-intrinsic JSXOPeningLikeElement
+         * @param shouldIncludeAllStatelessAttributesType a boolean indicating whether to include all attributes types from all stateless function signature
+         * @param sourceAttributesType Is the attributes type the user passed, and is used to create inferences in the target type if present
+         * @param elementType an instance type of the given opening-like element. If undefined, the function will check type openinglikeElement's tagname.
+         * @param elementClassType a JSX-ElementClass type. This is a result of looking up ElementClass interface in the JSX global (imported from react.d.ts)
+         * @return attributes type if able to resolve the type of node
+         *         anyType if there is no type ElementAttributesProperty or there is an error
+         *         emptyObjectType if there is no "prop" in the element instance type
+         */
         function resolveCustomJsxElementAttributesType(openingLikeElement, shouldIncludeAllStatelessAttributesType, elementType, elementClassType) {
-            if (elementType.flags & 262144) {
+            if (elementType.flags & 262144 /* Union */) {
                 var types = elementType.types;
                 return getUnionType(types.map(function (type) {
                     return resolveCustomJsxElementAttributesType(openingLikeElement, shouldIncludeAllStatelessAttributesType, type, elementClassType);
-                }), 2);
+                }), 2 /* Subtype */);
             }
+            // Shortcircuit any
             if (isTypeAny(elementType)) {
                 return elementType;
             }
-            else if (elementType.flags & 4) {
+            // If the elemType is a string type, we have to return anyType to prevent an error downstream as we will try to find construct or call signature of the type
+            else if (elementType.flags & 4 /* String */) {
                 return anyType;
             }
-            else if (elementType.flags & 64) {
+            else if (elementType.flags & 64 /* StringLiteral */) {
+                // If the elemType is a stringLiteral type, we can then provide a check to make sure that the string literal type is one of the Jsx intrinsic element type
+                // For example:
+                //      var CustomTag: "h1" = "h1";
+                //      <CustomTag> Hello World </CustomTag>
                 var intrinsicElementsType = getJsxType(JsxNames.IntrinsicElements, openingLikeElement);
                 if (intrinsicElementsType !== errorType) {
                     var stringLiteralTypeName = elementType.value;
@@ -36190,41 +44409,51 @@ var ts;
                     if (intrinsicProp) {
                         return getTypeOfSymbol(intrinsicProp);
                     }
-                    var indexSignatureType = getIndexTypeOfType(intrinsicElementsType, 0);
+                    var indexSignatureType = getIndexTypeOfType(intrinsicElementsType, 0 /* String */);
                     if (indexSignatureType) {
                         return indexSignatureType;
                     }
                     error(openingLikeElement, ts.Diagnostics.Property_0_does_not_exist_on_type_1, stringLiteralTypeName, "JSX." + JsxNames.IntrinsicElements);
                 }
+                // If we need to report an error, we already done so here. So just return any to prevent any more error downstream
                 return anyType;
             }
-            var instantiatedSignatures = getInstantiatedJsxSignatures(openingLikeElement, elementType, true);
+            // Get the element instance type (the result of newing or invoking this tag)
+            var instantiatedSignatures = getInstantiatedJsxSignatures(openingLikeElement, elementType, /*reportErrors*/ true);
             if (!ts.length(instantiatedSignatures)) {
                 return errorType;
             }
-            var elemInstanceType = getUnionType(instantiatedSignatures.map(getReturnTypeOfSignature), 2);
+            var elemInstanceType = getUnionType(instantiatedSignatures.map(getReturnTypeOfSignature), 2 /* Subtype */);
+            // If we should include all stateless attributes type, then get all attributes type from all stateless function signature.
+            // Otherwise get only attributes type from the signature picked by choose-overload logic.
             var statelessAttributesType = shouldIncludeAllStatelessAttributesType ?
                 tryGetAllJsxStatelessFunctionAttributesType(openingLikeElement, elementType, elemInstanceType, elementClassType) :
                 defaultTryGetJsxStatelessFunctionAttributesType(openingLikeElement, elementType, elemInstanceType, elementClassType);
             if (statelessAttributesType) {
                 return statelessAttributesType;
             }
+            // Issue an error if this return type isn't assignable to JSX.ElementClass
             if (elementClassType) {
                 checkTypeRelatedTo(elemInstanceType, elementClassType, assignableRelation, openingLikeElement, ts.Diagnostics.JSX_element_type_0_is_not_a_constructor_function_for_JSX_elements);
             }
             var isJs = ts.isInJavaScriptFile(openingLikeElement);
-            return getUnionType(instantiatedSignatures.map(function (sig) { return getJsxPropsTypeFromClassType(sig, isJs, openingLikeElement, true); }));
+            return getUnionType(instantiatedSignatures.map(function (sig) { return getJsxPropsTypeFromClassType(sig, isJs, openingLikeElement, /*reportErrors*/ true); }));
         }
+        /**
+         * Get attributes type of the given intrinsic opening-like Jsx element by resolving the tag name.
+         * The function is intended to be called from a function which has checked that the opening element is an intrinsic element.
+         * @param node an intrinsic JSX opening-like element
+         */
         function getIntrinsicAttributesTypeFromJsxOpeningLikeElement(node) {
             ts.Debug.assert(isJsxIntrinsicIdentifier(node.tagName));
             var links = getNodeLinks(node);
             if (!links.resolvedJsxElementAttributesType) {
                 var symbol = getIntrinsicTagSymbol(node);
-                if (links.jsxFlags & 1) {
+                if (links.jsxFlags & 1 /* IntrinsicNamedElement */) {
                     return links.resolvedJsxElementAttributesType = getTypeOfSymbol(symbol);
                 }
-                else if (links.jsxFlags & 2) {
-                    return links.resolvedJsxElementAttributesType = getIndexInfoOfSymbol(symbol, 0).type;
+                else if (links.jsxFlags & 2 /* IntrinsicIndexedElement */) {
+                    return links.resolvedJsxElementAttributesType = getIndexInfoOfSymbol(symbol, 0 /* String */).type;
                 }
                 else {
                     return links.resolvedJsxElementAttributesType = errorType;
@@ -36232,25 +44461,48 @@ var ts;
             }
             return links.resolvedJsxElementAttributesType;
         }
+        /**
+         * Get attributes type of the given custom opening-like JSX element.
+         * This function is intended to be called from a caller that handles intrinsic JSX element already.
+         * @param node a custom JSX opening-like element
+         * @param shouldIncludeAllStatelessAttributesType a boolean value used by language service to get all possible attributes type from an overload stateless function component
+         */
         function getCustomJsxElementAttributesType(node, shouldIncludeAllStatelessAttributesType) {
             return resolveCustomJsxElementAttributesType(node, shouldIncludeAllStatelessAttributesType, checkExpression(node.tagName), getJsxElementClassTypeAt(node));
         }
+        /**
+         * Get all possible attributes type, especially from an overload stateless function component, of the given JSX opening-like element.
+         * This function is called by language service (see: completions-tryGetGlobalSymbols).
+         * @param node a JSX opening-like element to get attributes type for
+         */
         function getAllAttributesTypeFromJsxOpeningLikeElement(node) {
             if (isJsxIntrinsicIdentifier(node.tagName)) {
                 return getIntrinsicAttributesTypeFromJsxOpeningLikeElement(node);
             }
             else {
-                return getCustomJsxElementAttributesType(node, true);
+                // Because in language service, the given JSX opening-like element may be incomplete and therefore,
+                // we can't resolve to exact signature if the element is a stateless function component so the best thing to do is return all attributes type from all overloads.
+                return getCustomJsxElementAttributesType(node, /*shouldIncludeAllStatelessAttributesType*/ true);
             }
         }
+        /**
+         * Get the attributes type, which indicates the attributes that are valid on the given JSXOpeningLikeElement.
+         * @param node a JSXOpeningLikeElement node
+         * @return an attributes type of the given node
+         */
         function getAttributesTypeFromJsxOpeningLikeElement(node) {
             if (isJsxIntrinsicIdentifier(node.tagName)) {
                 return getIntrinsicAttributesTypeFromJsxOpeningLikeElement(node);
             }
             else {
-                return getCustomJsxElementAttributesType(node, false);
+                return getCustomJsxElementAttributesType(node, /*shouldIncludeAllStatelessAttributesType*/ false);
             }
         }
+        /**
+         * Given a JSX attribute, returns the symbol for the corresponds property
+         * of the element attributes type. Will return unknownSymbol for attributes
+         * that have no matching element attributes type property.
+         */
         function getJsxAttributePropertySymbol(attrib) {
             var attributesType = getAttributesTypeFromJsxOpeningLikeElement(attrib.parent.parent);
             var prop = getPropertyOfType(attributesType, attrib.name.escapedText);
@@ -36271,12 +44523,16 @@ var ts;
                 return getUnionType([jsxElementType, nullType]);
             }
         }
+        /**
+         * Returns all the properties of the Jsx.IntrinsicElements interface
+         */
         function getJsxIntrinsicTagNamesAt(location) {
             var intrinsics = getJsxType(JsxNames.IntrinsicElements, location);
             return intrinsics ? getPropertiesOfType(intrinsics) : ts.emptyArray;
         }
         function checkJsxPreconditions(errorNode) {
-            if ((compilerOptions.jsx || 0) === 0) {
+            // Preconditions for using JSX
+            if ((compilerOptions.jsx || 0 /* None */) === 0 /* None */) {
                 error(errorNode, ts.Diagnostics.Cannot_use_JSX_unless_the_jsx_flag_is_provided);
             }
             if (getJsxElementTypeAt(errorNode) === undefined) {
@@ -36291,13 +44547,18 @@ var ts;
                 checkGrammarJsxElement(node);
             }
             checkJsxPreconditions(node);
-            var reactRefErr = diagnostics && compilerOptions.jsx === 2 ? ts.Diagnostics.Cannot_find_name_0 : undefined;
+            // The reactNamespace/jsxFactory's root symbol should be marked as 'used' so we don't incorrectly elide its import.
+            // And if there is no reactNamespace/jsxFactory's symbol in scope when targeting React emit, we should issue an error.
+            var reactRefErr = diagnostics && compilerOptions.jsx === 2 /* React */ ? ts.Diagnostics.Cannot_find_name_0 : undefined;
             var reactNamespace = getJsxNamespace(node);
             var reactLocation = isNodeOpeningLikeElement ? node.tagName : node;
-            var reactSym = resolveName(reactLocation, reactNamespace, 67216319, reactRefErr, reactNamespace, true);
+            var reactSym = resolveName(reactLocation, reactNamespace, 67216319 /* Value */, reactRefErr, reactNamespace, /*isUse*/ true);
             if (reactSym) {
-                reactSym.isReferenced = 67108863;
-                if (reactSym.flags & 2097152 && !isConstEnumOrConstEnumOnlyModule(resolveAlias(reactSym))) {
+                // Mark local symbol as referenced here because it might not have been marked
+                // if jsx emit was not react as there wont be error being emitted
+                reactSym.isReferenced = 67108863 /* All */;
+                // If react symbol is alias, mark it as refereced
+                if (reactSym.flags & 2097152 /* Alias */ && !isConstEnumOrConstEnumOnlyModule(resolveAlias(reactSym))) {
                     markAliasSymbolAsReferenced(reactSym);
                 }
             }
@@ -36308,17 +44569,31 @@ var ts;
                 checkJsxChildren(node.parent);
             }
         }
+        /**
+         * Check if a property with the given name is known anywhere in the given type. In an object type, a property
+         * is considered known if
+         * 1. the object type is empty and the check is for assignability, or
+         * 2. if the object type has index signatures, or
+         * 3. if the property is actually declared in the object type
+         *    (this means that 'toString', for example, is not usually a known property).
+         * 4. In a union or intersection type,
+         *    a property is considered known if it is known in any constituent type.
+         * @param targetType a type to search a given name in
+         * @param name a property name to search
+         * @param isComparingJsxAttributes a boolean flag indicating whether we are searching in JsxAttributesType
+         */
         function isKnownProperty(targetType, name, isComparingJsxAttributes) {
-            if (targetType.flags & 131072) {
+            if (targetType.flags & 131072 /* Object */) {
                 var resolved = resolveStructuredTypeMembers(targetType);
                 if (resolved.stringIndexInfo ||
                     resolved.numberIndexInfo && isNumericLiteralName(name) ||
                     getPropertyOfObjectType(targetType, name) ||
                     isComparingJsxAttributes && !isUnhyphenatedJsxName(name)) {
+                    // For JSXAttributes, if the attribute has a hyphenated name, consider that the attribute to be known.
                     return true;
                 }
             }
-            else if (targetType.flags & 786432) {
+            else if (targetType.flags & 786432 /* UnionOrIntersection */) {
                 for (var _i = 0, _a = targetType.types; _i < _a.length; _i++) {
                     var t = _a[_i];
                     if (isKnownProperty(t, name, isComparingJsxAttributes)) {
@@ -36328,12 +44603,30 @@ var ts;
             }
             return false;
         }
+        /**
+         * Check whether the given attributes of JSX opening-like element is assignable to the tagName attributes.
+         *      Get the attributes type of the opening-like element through resolving the tagName, "target attributes"
+         *      Check assignablity between given attributes property, "source attributes", and the "target attributes"
+         * @param openingLikeElement an opening-like JSX element to check its JSXAttributes
+         */
         function checkJsxAttributesAssignableToTagNameAttributes(openingLikeElement, checkMode) {
+            // The function involves following steps:
+            //      1. Figure out expected attributes type by resolving tagName of the JSX opening-like element, targetAttributesType.
+            //         During these steps, we will try to resolve the tagName as intrinsic name, stateless function, stateful component (in the order)
+            //      2. Solved JSX attributes type given by users, sourceAttributesType, which is by resolving "attributes" property of the JSX opening-like element.
+            //      3. Check if the two are assignable to each other
+            // targetAttributesType is a type of an attribute from resolving tagName of an opening-like JSX element.
             var targetAttributesType = isJsxIntrinsicIdentifier(openingLikeElement.tagName) ?
                 getIntrinsicAttributesTypeFromJsxOpeningLikeElement(openingLikeElement) :
-                getCustomJsxElementAttributesType(openingLikeElement, false);
+                getCustomJsxElementAttributesType(openingLikeElement, /*shouldIncludeAllStatelessAttributesType*/ false);
+            // sourceAttributesType is a type of an attributes properties.
+            // i.e <div attr1={10} attr2="string" />
+            //     attr1 and attr2 are treated as JSXAttributes attached in the JsxOpeningLikeElement as "attributes".
             var sourceAttributesType = createJsxAttributesTypeFromAttributesProperty(openingLikeElement, checkMode);
+            // Check if sourceAttributesType assignable to targetAttributesType though this check will allow excess properties
             var isSourceAttributeTypeAssignableToTarget = isTypeAssignableTo(sourceAttributesType, targetAttributesType);
+            // After we check for assignability, we will do another pass to check that all explicitly specified attributes have correct name corresponding in targetAttributeType.
+            // This will allow excess properties in spread type as it is very common pattern to spread outer attributes into React component in its render method.
             if (isSourceAttributeTypeAssignableToTarget && !isTypeAny(sourceAttributesType) && !isTypeAny(targetAttributesType)) {
                 for (var _i = 0, _a = openingLikeElement.attributes.properties; _i < _a.length; _i++) {
                     var attribute = _a[_i];
@@ -36342,34 +44635,38 @@ var ts;
                     }
                     var attrName = attribute.name;
                     var isNotIgnoredJsxProperty = (isUnhyphenatedJsxName(ts.idText(attrName)) || !!(getPropertyOfType(targetAttributesType, attrName.escapedText)));
-                    if (isNotIgnoredJsxProperty && !isKnownProperty(targetAttributesType, attrName.escapedText, true)) {
+                    if (isNotIgnoredJsxProperty && !isKnownProperty(targetAttributesType, attrName.escapedText, /*isComparingJsxAttributes*/ true)) {
                         error(attribute, ts.Diagnostics.Property_0_does_not_exist_on_type_1, ts.idText(attrName), typeToString(targetAttributesType));
+                        // We break here so that errors won't be cascading
                         break;
                     }
                 }
             }
             else if (!isSourceAttributeTypeAssignableToTarget) {
+                // Assignability failure - check each prop individually, and if that fails, fall back on the bad error span
                 if (ts.length(openingLikeElement.attributes.properties)) {
                     var reportedError = false;
-                    var _loop_7 = function (prop) {
+                    var _loop_5 = function (prop) {
                         if (ts.isJsxSpreadAttribute(prop))
                             return "continue";
                         var name = ts.idText(prop.name);
                         var sourcePropType = getIndexedAccessType(sourceAttributesType, getLiteralType(name));
                         var targetPropType = getIndexedAccessType(targetAttributesType, getLiteralType(name));
-                        var rootChain = function () { return ts.chainDiagnosticMessages(undefined, ts.Diagnostics.Types_of_property_0_are_incompatible, name); };
-                        if (!checkTypeAssignableTo(sourcePropType, targetPropType, prop, undefined, rootChain)) {
+                        var rootChain = function () { return ts.chainDiagnosticMessages(
+                        /*details*/ undefined, ts.Diagnostics.Types_of_property_0_are_incompatible, name); };
+                        if (!checkTypeAssignableTo(sourcePropType, targetPropType, prop, /*headMessage*/ undefined, rootChain)) {
                             reportedError = true;
                         }
                     };
                     for (var _b = 0, _c = openingLikeElement.attributes.properties; _b < _c.length; _b++) {
                         var prop = _c[_b];
-                        _loop_7(prop);
+                        _loop_5(prop);
                     }
                     if (reportedError) {
                         return;
                     }
                 }
+                // Report fallback error on just the component name
                 checkTypeAssignableTo(sourceAttributesType, targetAttributesType, openingLikeElement.tagName);
             }
         }
@@ -36385,56 +44682,86 @@ var ts;
                 return errorType;
             }
         }
+        // If a symbol is a synthesized symbol with no value declaration, we assume it is a property. Example of this are the synthesized
+        // '.prototype' property as well as synthesized tuple index properties.
         function getDeclarationKindFromSymbol(s) {
-            return s.valueDeclaration ? s.valueDeclaration.kind : 152;
+            return s.valueDeclaration ? s.valueDeclaration.kind : 152 /* PropertyDeclaration */;
         }
         function getDeclarationNodeFlagsFromSymbol(s) {
             return s.valueDeclaration ? ts.getCombinedNodeFlags(s.valueDeclaration) : 0;
         }
+        /**
+         * Return whether this symbol is a member of a prototype somewhere
+         * Note that this is not tracked well within the compiler, so the answer may be incorrect.
+         */
         function isPrototypeProperty(symbol) {
-            if (symbol.flags & 8192 || ts.getCheckFlags(symbol) & 4) {
+            if (symbol.flags & 8192 /* Method */ || ts.getCheckFlags(symbol) & 4 /* SyntheticMethod */) {
                 return true;
             }
             if (ts.isInJavaScriptFile(symbol.valueDeclaration)) {
                 var parent = symbol.valueDeclaration.parent;
                 return parent && ts.isBinaryExpression(parent) &&
-                    ts.getSpecialPropertyAssignmentKind(parent) === 3;
+                    ts.getSpecialPropertyAssignmentKind(parent) === 3 /* PrototypeProperty */;
             }
         }
+        /**
+         * Check whether the requested property access is valid.
+         * Returns true if node is a valid property access, and false otherwise.
+         * @param node The node to be checked.
+         * @param left The left hand side of the property access (e.g.: the super in `super.foo`).
+         * @param type The type of left.
+         * @param prop The symbol for the right hand side of the property access.
+         */
         function checkPropertyAccessibility(node, left, type, prop) {
             var flags = ts.getDeclarationModifierFlagsFromSymbol(prop);
-            var errorNode = node.kind === 185 || node.kind === 232 ?
+            var errorNode = node.kind === 185 /* PropertyAccessExpression */ || node.kind === 232 /* VariableDeclaration */ ?
                 node.name :
-                node.kind === 179 ?
+                node.kind === 179 /* ImportType */ ?
                     node :
                     node.right;
-            if (ts.getCheckFlags(prop) & 256) {
+            if (ts.getCheckFlags(prop) & 256 /* ContainsPrivate */) {
+                // Synthetic property with private constituent property
                 error(errorNode, ts.Diagnostics.Property_0_has_conflicting_declarations_and_is_inaccessible_in_type_1, symbolToString(prop), typeToString(type));
                 return false;
             }
-            if (left.kind === 97) {
-                if (languageVersion < 2) {
+            if (left.kind === 97 /* SuperKeyword */) {
+                // TS 1.0 spec (April 2014): 4.8.2
+                // - In a constructor, instance member function, instance member accessor, or
+                //   instance member variable initializer where this references a derived class instance,
+                //   a super property access is permitted and must specify a public instance member function of the base class.
+                // - In a static member function or static member accessor
+                //   where this references the constructor function object of a derived class,
+                //   a super property access is permitted and must specify a public static member function of the base class.
+                if (languageVersion < 2 /* ES2015 */) {
                     if (symbolHasNonMethodDeclaration(prop)) {
                         error(errorNode, ts.Diagnostics.Only_public_and_protected_methods_of_the_base_class_are_accessible_via_the_super_keyword);
                         return false;
                     }
                 }
-                if (flags & 128) {
+                if (flags & 128 /* Abstract */) {
+                    // A method cannot be accessed in a super property access if the method is abstract.
+                    // This error could mask a private property access error. But, a member
+                    // cannot simultaneously be private and abstract, so this will trigger an
+                    // additional error elsewhere.
                     error(errorNode, ts.Diagnostics.Abstract_method_0_in_class_1_cannot_be_accessed_via_super_expression, symbolToString(prop), typeToString(getDeclaringClass(prop)));
                     return false;
                 }
             }
-            if ((flags & 128) && ts.isThisProperty(node) && symbolHasNonMethodDeclaration(prop)) {
+            // Referencing abstract properties within their own constructors is not allowed
+            if ((flags & 128 /* Abstract */) && ts.isThisProperty(node) && symbolHasNonMethodDeclaration(prop)) {
                 var declaringClassDeclaration = ts.getClassLikeDeclarationOfSymbol(getParentOfSymbol(prop));
                 if (declaringClassDeclaration && isNodeWithinConstructorOfClass(node, declaringClassDeclaration)) {
-                    error(errorNode, ts.Diagnostics.Abstract_property_0_in_class_1_cannot_be_accessed_in_the_constructor, symbolToString(prop), ts.getTextOfIdentifierOrLiteral(declaringClassDeclaration.name));
+                    error(errorNode, ts.Diagnostics.Abstract_property_0_in_class_1_cannot_be_accessed_in_the_constructor, symbolToString(prop), ts.getTextOfIdentifierOrLiteral(declaringClassDeclaration.name)); // TODO: GH#18217
                     return false;
                 }
             }
-            if (!(flags & 24)) {
+            // Public properties are otherwise accessible.
+            if (!(flags & 24 /* NonPublicAccessibilityModifier */)) {
                 return true;
             }
-            if (flags & 8) {
+            // Property is known to be private or protected at this point
+            // Private property is accessible if the property is within the declaring class
+            if (flags & 8 /* Private */) {
                 var declaringClassDeclaration = ts.getClassLikeDeclarationOfSymbol(getParentOfSymbol(prop));
                 if (!isNodeWithinClass(node, declaringClassDeclaration)) {
                     error(errorNode, ts.Diagnostics.Property_0_is_private_and_only_accessible_within_class_1, symbolToString(prop), typeToString(getDeclaringClass(prop)));
@@ -36442,22 +44769,29 @@ var ts;
                 }
                 return true;
             }
-            if (left.kind === 97) {
+            // Property is known to be protected at this point
+            // All protected properties of a supertype are accessible in a super access
+            if (left.kind === 97 /* SuperKeyword */) {
                 return true;
             }
+            // Find the first enclosing class that has the declaring classes of the protected constituents
+            // of the property as base classes
             var enclosingClass = forEachEnclosingClass(node, function (enclosingDeclaration) {
                 var enclosingClass = getDeclaredTypeOfSymbol(getSymbolOfNode(enclosingDeclaration));
                 return isClassDerivedFromDeclaringClasses(enclosingClass, prop) ? enclosingClass : undefined;
             });
+            // A protected property is accessible if the property is within the declaring class or classes derived from it
             if (!enclosingClass) {
                 error(errorNode, ts.Diagnostics.Property_0_is_protected_and_only_accessible_within_class_1_and_its_subclasses, symbolToString(prop), typeToString(getDeclaringClass(prop) || type));
                 return false;
             }
-            if (flags & 32) {
+            // No further restrictions for static properties
+            if (flags & 32 /* Static */) {
                 return true;
             }
-            if (type.flags & 65536) {
-                type = type.isThisType ? getConstraintOfTypeParameter(type) : getBaseConstraintOfType(type);
+            if (type.flags & 65536 /* TypeParameter */) {
+                // get the original type -- represented as the type constraint of the 'this' type
+                type = type.isThisType ? getConstraintOfTypeParameter(type) : getBaseConstraintOfType(type); // TODO: GH#18217 Use a different variable that's allowed to be undefined
             }
             if (!type || !hasBaseType(type, enclosingClass)) {
                 error(errorNode, ts.Diagnostics.Property_0_is_protected_and_only_accessible_through_an_instance_of_class_1, symbolToString(prop), typeToString(enclosingClass));
@@ -36468,25 +44802,25 @@ var ts;
         function symbolHasNonMethodDeclaration(symbol) {
             return forEachProperty(symbol, function (prop) {
                 var propKind = getDeclarationKindFromSymbol(prop);
-                return propKind !== 154 && propKind !== 153;
+                return propKind !== 154 /* MethodDeclaration */ && propKind !== 153 /* MethodSignature */;
             });
         }
         function checkNonNullExpression(node, nullDiagnostic, undefinedDiagnostic, nullOrUndefinedDiagnostic) {
             return checkNonNullType(checkExpression(node), node, nullDiagnostic, undefinedDiagnostic, nullOrUndefinedDiagnostic);
         }
         function checkNonNullType(type, node, nullDiagnostic, undefinedDiagnostic, nullOrUndefinedDiagnostic) {
-            if (type.flags & 2) {
+            if (type.flags & 2 /* Unknown */) {
                 error(node, ts.Diagnostics.Object_is_of_type_unknown);
                 return errorType;
             }
-            var kind = (strictNullChecks ? getFalsyFlags(type) : type.flags) & 24576;
+            var kind = (strictNullChecks ? getFalsyFlags(type) : type.flags) & 24576 /* Nullable */;
             if (kind) {
-                error(node, kind & 8192 ? kind & 16384 ?
+                error(node, kind & 8192 /* Undefined */ ? kind & 16384 /* Null */ ?
                     (nullOrUndefinedDiagnostic || ts.Diagnostics.Object_is_possibly_null_or_undefined) :
                     (undefinedDiagnostic || ts.Diagnostics.Object_is_possibly_undefined) :
                     (nullDiagnostic || ts.Diagnostics.Object_is_possibly_null));
                 var t = getNonNullableType(type);
-                return t.flags & (24576 | 32768) ? errorType : t;
+                return t.flags & (24576 /* Nullable */ | 32768 /* Never */) ? errorType : t;
             }
             return type;
         }
@@ -36513,10 +44847,10 @@ var ts;
                 markAliasReferenced(parentSymbol, node);
             }
             if (!prop) {
-                var indexInfo = getIndexInfoOfType(apparentType, 0);
+                var indexInfo = getIndexInfoOfType(apparentType, 0 /* String */);
                 if (!(indexInfo && indexInfo.type)) {
                     if (right.escapedText && !checkAndReportErrorForExtendingInterface(node)) {
-                        reportNonexistentProperty(right, leftType.flags & 65536 && leftType.isThisType ? apparentType : leftType);
+                        reportNonexistentProperty(right, leftType.flags & 65536 /* TypeParameter */ && leftType.isThisType ? apparentType : leftType);
                     }
                     return errorType;
                 }
@@ -36527,7 +44861,7 @@ var ts;
             }
             else {
                 checkPropertyNotUsedBeforeDeclaration(prop, node, right);
-                markPropertyAsReferenced(prop, node, left.kind === 99);
+                markPropertyAsReferenced(prop, node, left.kind === 99 /* ThisKeyword */);
                 getNodeLinks(node).resolvedSymbol = prop;
                 checkPropertyAccessibility(node, left, apparentType, prop);
                 if (assignmentKind) {
@@ -36538,24 +44872,32 @@ var ts;
                 }
                 propType = getConstraintForLocation(getTypeOfSymbol(prop), node);
             }
-            if (node.kind !== 185 ||
-                assignmentKind === 1 ||
-                prop && !(prop.flags & (3 | 4 | 98304)) && !(prop.flags & 8192 && propType.flags & 262144)) {
+            // Only compute control flow type if this is a property access expression that isn't an
+            // assignment target, and the referenced property was declared as a variable, property,
+            // accessor, or optional method.
+            if (node.kind !== 185 /* PropertyAccessExpression */ ||
+                assignmentKind === 1 /* Definite */ ||
+                prop && !(prop.flags & (3 /* Variable */ | 4 /* Property */ | 98304 /* Accessor */)) && !(prop.flags & 8192 /* Method */ && propType.flags & 262144 /* Union */)) {
                 return propType;
             }
+            // If strict null checks and strict property initialization checks are enabled, if we have
+            // a this.xxx property access, if the property is an instance property without an initializer,
+            // and if we are in a constructor of the same class as the property declaration, assume that
+            // the property is uninitialized at the top of the control flow.
             var assumeUninitialized = false;
-            if (strictNullChecks && strictPropertyInitialization && left.kind === 99) {
+            if (strictNullChecks && strictPropertyInitialization && left.kind === 99 /* ThisKeyword */) {
                 var declaration = prop && prop.valueDeclaration;
                 if (declaration && isInstancePropertyWithoutInitializer(declaration)) {
                     var flowContainer = getControlFlowContainer(node);
-                    if (flowContainer.kind === 155 && flowContainer.parent === declaration.parent) {
+                    if (flowContainer.kind === 155 /* Constructor */ && flowContainer.parent === declaration.parent) {
                         assumeUninitialized = true;
                     }
                 }
             }
             var flowType = getFlowTypeOfReference(node, propType, assumeUninitialized ? getOptionalType(propType) : propType);
-            if (assumeUninitialized && !(getFalsyFlags(propType) & 8192) && getFalsyFlags(flowType) & 8192) {
-                error(right, ts.Diagnostics.Property_0_is_used_before_being_assigned, symbolToString(prop));
+            if (assumeUninitialized && !(getFalsyFlags(propType) & 8192 /* Undefined */) && getFalsyFlags(flowType) & 8192 /* Undefined */) {
+                error(right, ts.Diagnostics.Property_0_is_used_before_being_assigned, symbolToString(prop)); // TODO: GH#18217
+                // Return the declared type to reduce follow-on errors
                 return propType;
             }
             return assignmentKind ? getBaseTypeOfLiteralType(flowType) : flowType;
@@ -36570,9 +44912,9 @@ var ts;
                 && !isPropertyDeclaredInAncestorClass(prop)) {
                 error(right, ts.Diagnostics.Block_scoped_variable_0_used_before_its_declaration, ts.idText(right));
             }
-            else if (valueDeclaration.kind === 235 &&
-                node.parent.kind !== 162 &&
-                !(valueDeclaration.flags & 4194304) &&
+            else if (valueDeclaration.kind === 235 /* ClassDeclaration */ &&
+                node.parent.kind !== 162 /* TypeReference */ &&
+                !(valueDeclaration.flags & 4194304 /* Ambient */) &&
                 !isBlockScopedNameDeclaredBeforeUse(valueDeclaration, right)) {
                 error(right, ts.Diagnostics.Class_0_used_before_its_declaration, ts.idText(right));
             }
@@ -36580,17 +44922,22 @@ var ts;
         function isInPropertyInitializer(node) {
             return !!ts.findAncestor(node, function (node) {
                 switch (node.kind) {
-                    case 152:
+                    case 152 /* PropertyDeclaration */:
                         return true;
-                    case 270:
+                    case 270 /* PropertyAssignment */:
+                        // We might be in `a = { b: this.b }`, so keep looking. See `tests/cases/compiler/useBeforeDeclaration_propertyAssignment.ts`.
                         return false;
                     default:
                         return ts.isExpressionNode(node) ? false : "quit";
                 }
             });
         }
+        /**
+         * It's possible that "prop.valueDeclaration" is a local declaration, but the property was also declared in a superclass.
+         * In that case we won't consider it used before its declaration, because it gets its value from the superclass' declaration.
+         */
         function isPropertyDeclaredInAncestorClass(prop) {
-            if (!(prop.parent.flags & 32)) {
+            if (!(prop.parent.flags & 32 /* Class */)) {
                 return false;
             }
             var classType = getTypeOfSymbol(prop.parent);
@@ -36614,7 +44961,7 @@ var ts;
         }
         function reportNonexistentProperty(propNode, containingType) {
             var errorInfo;
-            if (containingType.flags & 262144 && !(containingType.flags & 32764)) {
+            if (containingType.flags & 262144 /* Union */ && !(containingType.flags & 32764 /* Primitive */)) {
                 for (var _i = 0, _a = containingType.types; _i < _a.length; _i++) {
                     var subtype = _a[_i];
                     if (!getPropertyOfType(subtype, propNode.escapedText)) {
@@ -36639,129 +44986,80 @@ var ts;
             diagnostics.add(ts.createDiagnosticForNodeFromMessageChain(propNode, errorInfo));
         }
         function getSuggestionForNonexistentProperty(node, containingType) {
-            var suggestion = getSpellingSuggestionForName(ts.idText(node), getPropertiesOfType(containingType), 67216319);
+            var suggestion = getSpellingSuggestionForName(ts.idText(node), getPropertiesOfType(containingType), 67216319 /* Value */);
             return suggestion && ts.symbolName(suggestion);
         }
         function getSuggestionForNonexistentSymbol(location, outerName, meaning) {
             ts.Debug.assert(outerName !== undefined, "outername should always be defined");
-            var result = resolveNameHelper(location, outerName, meaning, undefined, outerName, false, false, function (symbols, name, meaning) {
+            var result = resolveNameHelper(location, outerName, meaning, /*nameNotFoundMessage*/ undefined, outerName, /*isUse*/ false, /*excludeGlobals*/ false, function (symbols, name, meaning) {
                 ts.Debug.assertEqual(outerName, name, "name should equal outerName");
                 var symbol = getSymbol(symbols, name, meaning);
+                // Sometimes the symbol is found when location is a return type of a function: `typeof x` and `x` is declared in the body of the function
+                // So the table *contains* `x` but `x` isn't actually in scope.
+                // However, resolveNameHelper will continue and call this callback again, so we'll eventually get a correct suggestion.
                 return symbol || getSpellingSuggestionForName(ts.unescapeLeadingUnderscores(name), ts.arrayFrom(symbols.values()), meaning);
             });
             return result && ts.symbolName(result);
         }
         function getSuggestionForNonexistentModule(name, targetModule) {
-            var suggestion = targetModule.exports && getSpellingSuggestionForName(ts.idText(name), getExportsOfModuleAsArray(targetModule), 2623475);
+            var suggestion = targetModule.exports && getSpellingSuggestionForName(ts.idText(name), getExportsOfModuleAsArray(targetModule), 2623475 /* ModuleMember */);
             return suggestion && ts.symbolName(suggestion);
         }
+        /**
+         * Given a name and a list of symbols whose names are *not* equal to the name, return a spelling suggestion if there is one that is close enough.
+         * Names less than length 3 only check for case-insensitive equality, not levenshtein distance.
+         *
+         * If there is a candidate that's the same except for case, return that.
+         * If there is a candidate that's within one edit of the name, return that.
+         * Otherwise, return the candidate with the smallest Levenshtein distance,
+         *    except for candidates:
+         *      * With no name
+         *      * Whose meaning doesn't match the `meaning` parameter.
+         *      * Whose length differs from the target name by more than 0.34 of the length of the name.
+         *      * Whose levenshtein distance is more than 0.4 of the length of the name
+         *        (0.4 allows 1 substitution/transposition for every 5 characters,
+         *         and 1 insertion/deletion at 3 characters)
+         */
         function getSpellingSuggestionForName(name, symbols, meaning) {
-            var maximumLengthDifference = Math.min(2, Math.floor(name.length * 0.34));
-            var bestDistance = Math.floor(name.length * 0.4) + 1;
-            var bestCandidate;
-            var justCheckExactMatches = false;
-            var nameLowerCase = name.toLowerCase();
-            for (var _i = 0, symbols_3 = symbols; _i < symbols_3.length; _i++) {
-                var candidate = symbols_3[_i];
+            return ts.getSpellingSuggestion(name, symbols, getCandidateName);
+            function getCandidateName(candidate) {
                 var candidateName = ts.symbolName(candidate);
-                if (candidateName.charCodeAt(0) === 34
-                    || !(candidate.flags & meaning && Math.abs(candidateName.length - nameLowerCase.length) <= maximumLengthDifference)) {
-                    continue;
-                }
-                var candidateNameLowerCase = candidateName.toLowerCase();
-                if (candidateNameLowerCase === nameLowerCase) {
-                    return candidate;
-                }
-                if (justCheckExactMatches) {
-                    continue;
-                }
-                if (candidateName.length < 3) {
-                    continue;
-                }
-                var distance = levenshteinWithMax(nameLowerCase, candidateNameLowerCase, bestDistance - 1);
-                if (distance === undefined) {
-                    continue;
-                }
-                if (distance < 3) {
-                    justCheckExactMatches = true;
-                    bestCandidate = candidate;
-                }
-                else {
-                    ts.Debug.assert(distance < bestDistance);
-                    bestDistance = distance;
-                    bestCandidate = candidate;
-                }
+                return !ts.startsWith(candidateName, "\"") && candidate.flags & meaning ? candidateName : undefined;
             }
-            return bestCandidate;
-        }
-        function levenshteinWithMax(s1, s2, max) {
-            var previous = new Array(s2.length + 1);
-            var current = new Array(s2.length + 1);
-            var big = max + 1;
-            for (var i = 0; i <= s2.length; i++) {
-                previous[i] = i;
-            }
-            for (var i = 1; i <= s1.length; i++) {
-                var c1 = s1.charCodeAt(i - 1);
-                var minJ = i > max ? i - max : 1;
-                var maxJ = s2.length > max + i ? max + i : s2.length;
-                current[0] = i;
-                var colMin = i;
-                for (var j = 1; j < minJ; j++) {
-                    current[j] = big;
-                }
-                for (var j = minJ; j <= maxJ; j++) {
-                    var dist = c1 === s2.charCodeAt(j - 1)
-                        ? previous[j - 1]
-                        : Math.min(previous[j] + 1, current[j - 1] + 1, previous[j - 1] + 2);
-                    current[j] = dist;
-                    colMin = Math.min(colMin, dist);
-                }
-                for (var j = maxJ + 1; j <= s2.length; j++) {
-                    current[j] = big;
-                }
-                if (colMin > max) {
-                    return undefined;
-                }
-                var temp = previous;
-                previous = current;
-                current = temp;
-            }
-            var res = previous[s2.length];
-            return res > max ? undefined : res;
         }
         function markPropertyAsReferenced(prop, nodeForCheckWriteOnly, isThisAccess) {
-            if (!prop || !(prop.flags & 106500) || !prop.valueDeclaration || !ts.hasModifier(prop.valueDeclaration, 8)) {
+            if (!prop || !(prop.flags & 106500 /* ClassMember */) || !prop.valueDeclaration || !ts.hasModifier(prop.valueDeclaration, 8 /* Private */)) {
                 return;
             }
-            if (nodeForCheckWriteOnly && ts.isWriteOnlyAccess(nodeForCheckWriteOnly) && !(prop.flags & 65536 && !(prop.flags & 32768))) {
+            if (nodeForCheckWriteOnly && ts.isWriteOnlyAccess(nodeForCheckWriteOnly) && !(prop.flags & 65536 /* SetAccessor */ && !(prop.flags & 32768 /* GetAccessor */))) {
                 return;
             }
             if (isThisAccess) {
+                // Find any FunctionLikeDeclaration because those create a new 'this' binding. But this should only matter for methods (or getters/setters).
                 var containingMethod = ts.findAncestor(nodeForCheckWriteOnly, ts.isFunctionLikeDeclaration);
                 if (containingMethod && containingMethod.symbol === prop) {
                     return;
                 }
             }
-            (ts.getCheckFlags(prop) & 1 ? getSymbolLinks(prop).target : prop).isReferenced = 67108863;
+            (ts.getCheckFlags(prop) & 1 /* Instantiated */ ? getSymbolLinks(prop).target : prop).isReferenced = 67108863 /* All */;
         }
         function isValidPropertyAccess(node, propertyName) {
             switch (node.kind) {
-                case 185:
+                case 185 /* PropertyAccessExpression */:
                     return isValidPropertyAccessWithType(node, node.expression, propertyName, getWidenedType(checkExpression(node.expression)));
-                case 146:
+                case 146 /* QualifiedName */:
                     return isValidPropertyAccessWithType(node, node.left, propertyName, getWidenedType(checkExpression(node.left)));
-                case 179:
+                case 179 /* ImportType */:
                     return isValidPropertyAccessWithType(node, node, propertyName, getTypeFromTypeNode(node));
             }
         }
         function isValidPropertyAccessForCompletions(node, type, property) {
-            return isValidPropertyAccessWithType(node, node.kind === 179 ? node : node.expression, property.escapedName, type)
-                && (!(property.flags & 8192) || isValidMethodAccess(property, type));
+            return isValidPropertyAccessWithType(node, node.kind === 179 /* ImportType */ ? node : node.expression, property.escapedName, type)
+                && (!(property.flags & 8192 /* Method */) || isValidMethodAccess(property, type));
         }
         function isValidMethodAccess(method, actualThisType) {
             var propType = getTypeOfPropertyOfType(actualThisType, method.escapedName);
-            var signatures = getSignaturesOfType(getNonNullableType(propType), 0);
+            var signatures = getSignaturesOfType(getNonNullableType(propType), 0 /* Call */);
             ts.Debug.assert(signatures.length !== 0);
             return signatures.some(function (sig) {
                 var signatureThisType = getThisTypeOfSignature(sig);
@@ -36772,7 +45070,7 @@ var ts;
             if (!sig.typeParameters) {
                 return signatureThisType;
             }
-            var context = createInferenceContext(sig.typeParameters, sig, 0);
+            var context = createInferenceContext(sig.typeParameters, sig, 0 /* None */);
             inferTypes(context.inferences, actualThisType, signatureThisType);
             return instantiateType(signatureThisType, createSignatureTypeMapper(sig, getInferredTypes(context)));
         }
@@ -36782,33 +45080,44 @@ var ts;
             }
             var prop = getPropertyOfType(type, propertyName);
             return prop ? checkPropertyAccessibility(node, left, type, prop)
-                : ts.isInJavaScriptFile(node) && (type.flags & 262144) !== 0 && type.types.some(function (elementType) { return isValidPropertyAccessWithType(node, left, propertyName, elementType); });
+                // In js files properties of unions are allowed in completion
+                : ts.isInJavaScriptFile(node) && (type.flags & 262144 /* Union */) !== 0 && type.types.some(function (elementType) { return isValidPropertyAccessWithType(node, left, propertyName, elementType); });
         }
+        /**
+         * Return the symbol of the for-in variable declared or referenced by the given for-in statement.
+         */
         function getForInVariableSymbol(node) {
             var initializer = node.initializer;
-            if (initializer.kind === 233) {
+            if (initializer.kind === 233 /* VariableDeclarationList */) {
                 var variable = initializer.declarations[0];
                 if (variable && !ts.isBindingPattern(variable.name)) {
                     return getSymbolOfNode(variable);
                 }
             }
-            else if (initializer.kind === 71) {
+            else if (initializer.kind === 71 /* Identifier */) {
                 return getResolvedSymbol(initializer);
             }
             return undefined;
         }
+        /**
+         * Return true if the given type is considered to have numeric property names.
+         */
         function hasNumericPropertyNames(type) {
-            return getIndexTypeOfType(type, 1) && !getIndexTypeOfType(type, 0);
+            return getIndexTypeOfType(type, 1 /* Number */) && !getIndexTypeOfType(type, 0 /* String */);
         }
+        /**
+         * Return true if given node is an expression consisting of an identifier (possibly parenthesized)
+         * that references a for-in variable for an object with numeric property names.
+         */
         function isForInVariableForNumericPropertyNames(expr) {
             var e = ts.skipParentheses(expr);
-            if (e.kind === 71) {
+            if (e.kind === 71 /* Identifier */) {
                 var symbol = getResolvedSymbol(e);
-                if (symbol.flags & 3) {
+                if (symbol.flags & 3 /* Variable */) {
                     var child = expr;
                     var node = expr.parent;
                     while (node) {
-                        if (node.kind === 221 &&
+                        if (node.kind === 221 /* ForInStatement */ &&
                             child === node.statement &&
                             getForInVariableSymbol(node) === symbol &&
                             hasNumericPropertyNames(getTypeOfExpression(node.expression))) {
@@ -36826,7 +45135,7 @@ var ts;
             var indexExpression = node.argumentExpression;
             if (!indexExpression) {
                 var sourceFile = ts.getSourceFileOfNode(node);
-                if (node.parent.kind === 188 && node.parent.expression === node) {
+                if (node.parent.kind === 188 /* NewExpression */ && node.parent.expression === node) {
                     var start = ts.skipTrivia(sourceFile.text, node.expression.end);
                     var end = node.end;
                     grammarErrorAtPos(sourceFile, start, end - start, ts.Diagnostics.new_T_cannot_be_used_to_create_an_array_Use_new_Array_T_instead);
@@ -36842,7 +45151,7 @@ var ts;
             if (objectType === errorType || objectType === silentNeverType) {
                 return objectType;
             }
-            if (isConstEnumObjectType(objectType) && indexExpression.kind !== 9) {
+            if (isConstEnumObjectType(objectType) && indexExpression.kind !== 9 /* StringLiteral */) {
                 error(indexExpression, ts.Diagnostics.A_const_enum_member_can_only_be_accessed_using_a_string_literal);
                 return errorType;
             }
@@ -36850,24 +45159,29 @@ var ts;
         }
         function checkThatExpressionIsProperSymbolReference(expression, expressionType, reportError) {
             if (expressionType === errorType) {
+                // There is already an error, so no need to report one.
                 return false;
             }
             if (!ts.isWellKnownSymbolSyntactically(expression)) {
                 return false;
             }
-            if ((expressionType.flags & 3072) === 0) {
+            // Make sure the property type is the primitive symbol type
+            if ((expressionType.flags & 3072 /* ESSymbolLike */) === 0) {
                 if (reportError) {
                     error(expression, ts.Diagnostics.A_computed_property_name_of_the_form_0_must_be_of_type_symbol, ts.getTextOfNode(expression));
                 }
                 return false;
             }
+            // The name is Symbol.<someName>, so make sure Symbol actually resolves to the
+            // global Symbol object
             var leftHandSide = expression.expression;
             var leftHandSideSymbol = getResolvedSymbol(leftHandSide);
             if (!leftHandSideSymbol) {
                 return false;
             }
-            var globalESSymbol = getGlobalESSymbolConstructorSymbol(true);
+            var globalESSymbol = getGlobalESSymbolConstructorSymbol(/*reportErrors*/ true);
             if (!globalESSymbol) {
+                // Already errored when we tried to look up the symbol
                 return false;
             }
             if (leftHandSideSymbol !== globalESSymbol) {
@@ -36879,16 +45193,19 @@ var ts;
             return true;
         }
         function callLikeExpressionMayHaveTypeArguments(node) {
+            // TODO: Also include tagged templates (https://github.com/Microsoft/TypeScript/issues/11947)
             return ts.isCallOrNewExpression(node);
         }
         function resolveUntypedCall(node) {
             if (callLikeExpressionMayHaveTypeArguments(node)) {
+                // Check type arguments even though we will give an error that untyped calls may not accept type arguments.
+                // This gets us diagnostics for the type arguments and marks them as referenced.
                 ts.forEach(node.typeArguments, checkSourceElement);
             }
-            if (node.kind === 189) {
+            if (node.kind === 189 /* TaggedTemplateExpression */) {
                 checkExpression(node.template);
             }
-            else if (node.kind !== 150) {
+            else if (node.kind !== 150 /* Decorator */) {
                 ts.forEach(node.arguments, function (argument) {
                     checkExpression(argument);
                 });
@@ -36899,6 +45216,14 @@ var ts;
             resolveUntypedCall(node);
             return unknownSignature;
         }
+        // Re-order candidate signatures into the result array. Assumes the result array to be empty.
+        // The candidate list orders groups in reverse, but within a group signatures are kept in declaration order
+        // A nit here is that we reorder only signatures that belong to the same symbol,
+        // so order how inherited signatures are processed is still preserved.
+        // interface A { (x: string): void }
+        // interface B extends A { (x: 'foo'): string }
+        // const b: B;
+        // b('foo') // <- here overloads should be processed as [(x:'foo'): string, (x: string): void]
         function reorderCandidates(signatures, result) {
             var lastParent;
             var lastSymbol;
@@ -36921,13 +45246,20 @@ var ts;
                     }
                 }
                 else {
+                    // current declaration belongs to a different symbol
+                    // set cutoffIndex so re-orderings in the future won't change result set from 0 to cutoffIndex
                     index = cutoffIndex = result.length;
                     lastParent = parent;
                 }
                 lastSymbol = symbol;
+                // specialized signatures always need to be placed before non-specialized signatures regardless
+                // of the cutoff position; see GH#1133
                 if (signature.hasLiteralTypes) {
                     specializedIndex++;
                     spliceIndex = specializedIndex;
+                    // The cutoff index always needs to be greater than or equal to the specialized signature index
+                    // in order to prevent non-specialized signatures from being added before a specialized
+                    // signature.
                     cutoffIndex++;
                 }
                 else {
@@ -36939,7 +45271,7 @@ var ts;
         function getSpreadArgumentIndex(args) {
             for (var i = 0; i < args.length; i++) {
                 var arg = args[i];
-                if (arg && arg.kind === 204) {
+                if (arg && arg.kind === 204 /* SpreadElement */) {
                     return i;
                 }
             }
@@ -36947,36 +45279,46 @@ var ts;
         }
         function hasCorrectArity(node, args, signature, signatureHelpTrailingComma) {
             if (signatureHelpTrailingComma === void 0) { signatureHelpTrailingComma = false; }
-            var argCount;
-            var typeArguments;
-            var callIsIncomplete = false;
+            var argCount; // Apparent number of arguments we will have in this call
+            var typeArguments; // Type arguments (undefined if none)
+            var callIsIncomplete = false; // In incomplete call we want to be lenient when we have too few arguments
             var spreadArgIndex = -1;
             if (ts.isJsxOpeningLikeElement(node)) {
+                // The arity check will be done in "checkApplicableSignatureForJsxOpeningLikeElement".
                 return true;
             }
-            if (node.kind === 189) {
+            if (node.kind === 189 /* TaggedTemplateExpression */) {
+                // Even if the call is incomplete, we'll have a missing expression as our last argument,
+                // so we can say the count is just the arg list length
                 argCount = args.length;
                 typeArguments = node.typeArguments;
-                if (node.template.kind === 202) {
-                    var lastSpan = ts.last(node.template.templateSpans);
+                if (node.template.kind === 202 /* TemplateExpression */) {
+                    // If a tagged template expression lacks a tail literal, the call is incomplete.
+                    // Specifically, a template only can end in a TemplateTail or a Missing literal.
+                    var lastSpan = ts.last(node.template.templateSpans); // we should always have at least one span.
                     callIsIncomplete = ts.nodeIsMissing(lastSpan.literal) || !!lastSpan.literal.isUnterminated;
                 }
                 else {
+                    // If the template didn't end in a backtick, or its beginning occurred right prior to EOF,
+                    // then this might actually turn out to be a TemplateHead in the future;
+                    // so we consider the call to be incomplete.
                     var templateLiteral = node.template;
-                    ts.Debug.assert(templateLiteral.kind === 13);
+                    ts.Debug.assert(templateLiteral.kind === 13 /* NoSubstitutionTemplateLiteral */);
                     callIsIncomplete = !!templateLiteral.isUnterminated;
                 }
             }
-            else if (node.kind === 150) {
+            else if (node.kind === 150 /* Decorator */) {
                 typeArguments = undefined;
-                argCount = getEffectiveArgumentCount(node, undefined, signature);
+                argCount = getEffectiveArgumentCount(node, /*args*/ undefined, signature);
             }
             else {
                 if (!node.arguments) {
-                    ts.Debug.assert(node.kind === 188);
+                    // This only happens when we have something of the form: 'new C'
+                    ts.Debug.assert(node.kind === 188 /* NewExpression */);
                     return signature.minArgumentCount === 0;
                 }
                 argCount = signatureHelpTrailingComma ? args.length + 1 : args.length;
+                // If we are missing the close parenthesis, the call is incomplete.
                 callIsIncomplete = node.arguments.end === node.end;
                 typeArguments = node.typeArguments;
                 spreadArgIndex = getSpreadArgumentIndex(args);
@@ -36984,24 +45326,30 @@ var ts;
             if (!hasCorrectTypeArgumentArity(signature, typeArguments)) {
                 return false;
             }
+            // If a spread argument is present, check that it corresponds to a rest parameter or at least that it's in the valid range.
             if (spreadArgIndex >= 0) {
                 return isRestParameterIndex(signature, spreadArgIndex) ||
                     signature.minArgumentCount <= spreadArgIndex && spreadArgIndex < signature.parameters.length;
             }
+            // Too many arguments implies incorrect arity.
             if (!signature.hasRestParameter && argCount > signature.parameters.length) {
                 return false;
             }
+            // If the call is incomplete, we should skip the lower bound check.
             var hasEnoughArguments = argCount >= signature.minArgumentCount;
             return callIsIncomplete || hasEnoughArguments;
         }
         function hasCorrectTypeArgumentArity(signature, typeArguments) {
+            // If the user supplied type arguments, but the number of type arguments does not match
+            // the declared number of type parameters, the call has an incorrect arity.
             var numTypeParameters = ts.length(signature.typeParameters);
             var minTypeArgumentCount = getMinTypeArgumentCount(signature.typeParameters);
             return !typeArguments ||
                 (typeArguments.length >= minTypeArgumentCount && typeArguments.length <= numTypeParameters);
         }
+        // If type has a single call signature and no other members, return that signature. Otherwise, return undefined.
         function getSingleCallSignature(type) {
-            if (type.flags & 131072) {
+            if (type.flags & 131072 /* Object */) {
                 var resolved = resolveStructuredTypeMembers(type);
                 if (resolved.callSignatures.length === 1 && resolved.constructSignatures.length === 0 &&
                     resolved.properties.length === 0 && !resolved.stringIndexInfo && !resolved.numberIndexInfo) {
@@ -37010,42 +45358,66 @@ var ts;
             }
             return undefined;
         }
+        // Instantiate a generic signature in the context of a non-generic signature (section 3.8.5 in TypeScript spec)
         function instantiateSignatureInContextOf(signature, contextualSignature, contextualMapper, compareTypes) {
-            var context = createInferenceContext(signature.typeParameters, signature, 1, compareTypes);
+            var context = createInferenceContext(signature.typeParameters, signature, 1 /* InferUnionTypes */, compareTypes);
             forEachMatchingParameterType(contextualSignature, signature, function (source, target) {
+                // Type parameters from outer context referenced by source type are fixed by instantiation of the source type
                 inferTypes(context.inferences, instantiateType(source, contextualMapper || identityMapper), target);
             });
             if (!contextualMapper) {
-                inferTypes(context.inferences, getReturnTypeOfSignature(contextualSignature), getReturnTypeOfSignature(signature), 8);
+                inferTypes(context.inferences, getReturnTypeOfSignature(contextualSignature), getReturnTypeOfSignature(signature), 8 /* ReturnType */);
             }
             return getSignatureInstantiation(signature, getInferredTypes(context), ts.isInJavaScriptFile(contextualSignature.declaration));
         }
         function inferJsxTypeArguments(signature, node, context) {
+            // Skip context sensitive pass
             var skipContextParamType = getTypeAtPosition(signature, 0);
             var checkAttrTypeSkipContextSensitive = checkExpressionWithContextualType(node.attributes, skipContextParamType, identityMapper);
             inferTypes(context.inferences, checkAttrTypeSkipContextSensitive, skipContextParamType);
+            // Standard pass
             var paramType = getTypeAtPosition(signature, 0);
             var checkAttrType = checkExpressionWithContextualType(node.attributes, paramType, context);
             inferTypes(context.inferences, checkAttrType, paramType);
             return getInferredTypes(context);
         }
         function inferTypeArguments(node, signature, args, excludeArgument, context) {
+            // Clear out all the inference results from the last time inferTypeArguments was called on this context
             for (var _i = 0, _a = context.inferences; _i < _a.length; _i++) {
                 var inference = _a[_i];
+                // As an optimization, we don't have to clear (and later recompute) inferred types
+                // for type parameters that have already been fixed on the previous call to inferTypeArguments.
+                // It would be just as correct to reset all of them. But then we'd be repeating the same work
+                // for the type parameters that were fixed, namely the work done by getInferredType.
                 if (!inference.isFixed) {
                     inference.inferredType = undefined;
                 }
             }
-            if (node.kind !== 150) {
+            // If a contextual type is available, infer from that type to the return type of the call expression. For
+            // example, given a 'function wrap<T, U>(cb: (x: T) => U): (x: T) => U' and a call expression
+            // 'let f: (x: string) => number = wrap(s => s.length)', we infer from the declared type of 'f' to the
+            // return type of 'wrap'.
+            if (node.kind !== 150 /* Decorator */) {
                 var contextualType = getContextualType(node);
                 if (contextualType) {
+                    // We clone the contextual mapper to avoid disturbing a resolution in progress for an
+                    // outer call expression. Effectively we just want a snapshot of whatever has been
+                    // inferred for any outer call expression so far.
                     var instantiatedType = instantiateType(contextualType, cloneTypeMapper(getContextualMapper(node)));
+                    // If the contextual type is a generic function type with a single call signature, we
+                    // instantiate the type with its own type parameters and type arguments. This ensures that
+                    // the type parameters are not erased to type any during type inference such that they can
+                    // be inferred as actual types from the contextual type. For example:
+                    //   declare function arrayMap<T, U>(f: (x: T) => U): (a: T[]) => U[];
+                    //   const boxElements: <A>(a: A[]) => { value: A }[] = arrayMap(value => ({ value }));
+                    // Above, the type of the 'value' parameter is inferred to be 'A'.
                     var contextualSignature = getSingleCallSignature(instantiatedType);
                     var inferenceSourceType = contextualSignature && contextualSignature.typeParameters ?
                         getOrCreateTypeFromSignature(getSignatureInstantiation(contextualSignature, contextualSignature.typeParameters, ts.isInJavaScriptFile(node))) :
                         instantiatedType;
                     var inferenceTargetType = getReturnTypeOfSignature(signature);
-                    inferTypes(context.inferences, inferenceSourceType, inferenceTargetType, 8);
+                    // Inferences made from return types have lower priority than all other inferences.
+                    inferTypes(context.inferences, inferenceSourceType, inferenceTargetType, 8 /* ReturnType */);
                 }
             }
             var thisType = getThisTypeOfSignature(signature);
@@ -37054,21 +45426,34 @@ var ts;
                 var thisArgumentType = thisArgumentNode ? checkExpression(thisArgumentNode) : voidType;
                 inferTypes(context.inferences, thisArgumentType, thisType);
             }
+            // We perform two passes over the arguments. In the first pass we infer from all arguments, but use
+            // wildcards for all context sensitive function expressions.
             var argCount = getEffectiveArgumentCount(node, args, signature);
             for (var i = 0; i < argCount; i++) {
                 var arg = getEffectiveArgument(node, args, i);
-                if (arg === undefined || arg.kind !== 206) {
+                // If the effective argument is 'undefined', then it is an argument that is present but is synthetic.
+                if (arg === undefined || arg.kind !== 206 /* OmittedExpression */) {
                     var paramType = getTypeAtPosition(signature, i);
                     var argType = getEffectiveArgumentType(node, i);
+                    // If the effective argument type is 'undefined', there is no synthetic type
+                    // for the argument. In that case, we should check the argument.
                     if (argType === undefined) {
+                        // For context sensitive arguments we pass the identityMapper, which is a signal to treat all
+                        // context sensitive function expressions as wildcards
                         var mapper = excludeArgument && excludeArgument[i] !== undefined ? identityMapper : context;
                         argType = checkExpressionWithContextualType(arg, paramType, mapper);
                     }
                     inferTypes(context.inferences, argType, paramType);
                 }
             }
+            // In the second pass we visit only context sensitive arguments, and only those that aren't excluded, this
+            // time treating function expressions normally (which may cause previously inferred type arguments to be fixed
+            // as we construct types for contextually typed parameters)
+            // Decorators will not have `excludeArgument`, as their arguments cannot be contextually typed.
+            // Tagged template expressions will always have `undefined` for `excludeArgument[0]`.
             if (excludeArgument) {
                 for (var i = 0; i < argCount; i++) {
+                    // No need to check for omitted args and template expressions, their exclusion value is always undefined
                     if (excludeArgument[i] === false) {
                         var arg = args[i];
                         var paramType = getTypeAtPosition(signature, i);
@@ -37088,7 +45473,7 @@ var ts;
                 var constraint = getConstraintOfTypeParameter(typeParameters[i]);
                 if (!constraint)
                     continue;
-                var errorInfo = reportErrors && headMessage ? (function () { return ts.chainDiagnosticMessages(undefined, ts.Diagnostics.Type_0_does_not_satisfy_the_constraint_1); }) : undefined;
+                var errorInfo = reportErrors && headMessage ? (function () { return ts.chainDiagnosticMessages(/*details*/ undefined, ts.Diagnostics.Type_0_does_not_satisfy_the_constraint_1); }) : undefined;
                 var typeArgumentHeadMessage = headMessage || ts.Diagnostics.Type_0_does_not_satisfy_the_constraint_1;
                 if (!mapper) {
                     mapper = createTypeMapper(typeParameters, typeArgumentTypes);
@@ -37100,14 +45485,29 @@ var ts;
             }
             return typeArgumentTypes;
         }
+        /**
+         * Check if the given signature can possibly be a signature called by the JSX opening-like element.
+         * @param node a JSX opening-like element we are trying to figure its call signature
+         * @param signature a candidate signature we are trying whether it is a call signature
+         * @param relation a relationship to check parameter and argument type
+         * @param excludeArgument
+         */
         function checkApplicableSignatureForJsxOpeningLikeElement(node, signature, relation) {
-            var callIsIncomplete = node.attributes.end === node.end;
+            // JSX opening-like element has correct arity for stateless-function component if the one of the following condition is true:
+            //      1. callIsIncomplete
+            //      2. attributes property has same number of properties as the parameter object type.
+            //         We can figure that out by resolving attributes property and check number of properties in the resolved type
+            // If the call has correct arity, we will then check if the argument type and parameter type is assignable
+            var callIsIncomplete = node.attributes.end === node.end; // If we are missing the close "/>", the call is incomplete
             if (callIsIncomplete) {
                 return true;
             }
             var headMessage = ts.Diagnostics.Argument_of_type_0_is_not_assignable_to_parameter_of_type_1;
+            // Stateless function components can have maximum of three arguments: "props", "context", and "updater".
+            // However "context" and "updater" are implicit and can't be specify by users. Only the first parameter, props,
+            // can be specified by users through attributes property.
             var paramType = getTypeAtPosition(signature, 0);
-            var attributesType = checkExpressionWithContextualType(node.attributes, paramType, undefined);
+            var attributesType = checkExpressionWithContextualType(node.attributes, paramType, /*contextualMapper*/ undefined);
             var argProperties = getPropertiesOfType(attributesType);
             for (var _i = 0, argProperties_1 = argProperties; _i < argProperties_1.length; _i++) {
                 var arg = argProperties_1[_i];
@@ -37115,14 +45515,17 @@ var ts;
                     return false;
                 }
             }
-            return checkTypeRelatedTo(attributesType, paramType, relation, undefined, headMessage);
+            return checkTypeRelatedTo(attributesType, paramType, relation, /*errorNode*/ undefined, headMessage);
         }
         function checkApplicableSignature(node, args, signature, relation, excludeArgument, reportErrors) {
             if (ts.isJsxOpeningLikeElement(node)) {
                 return checkApplicableSignatureForJsxOpeningLikeElement(node, signature, relation);
             }
             var thisType = getThisTypeOfSignature(signature);
-            if (thisType && thisType !== voidType && node.kind !== 188) {
+            if (thisType && thisType !== voidType && node.kind !== 188 /* NewExpression */) {
+                // If the called expression is not of the form `x.f` or `x["f"]`, then sourceType = voidType
+                // If the signature's 'this' type is voidType, then the check is skipped -- anything is compatible.
+                // If the expression is a new expression, then the check is skipped.
                 var thisArgumentNode = getThisArgumentOfCall(node);
                 var thisArgumentType = thisArgumentNode ? checkExpression(thisArgumentNode) : voidType;
                 var errorNode = reportErrors ? (thisArgumentNode || node) : undefined;
@@ -37135,11 +45538,19 @@ var ts;
             var argCount = getEffectiveArgumentCount(node, args, signature);
             for (var i = 0; i < argCount; i++) {
                 var arg = getEffectiveArgument(node, args, i);
-                if (arg === undefined || arg.kind !== 206) {
+                // If the effective argument is 'undefined', then it is an argument that is present but is synthetic.
+                if (arg === undefined || arg.kind !== 206 /* OmittedExpression */) {
+                    // Check spread elements against rest type (from arity check we know spread argument corresponds to a rest parameter)
                     var paramType = getTypeAtPosition(signature, i);
+                    // If the effective argument type is undefined, there is no synthetic type for the argument.
+                    // In that case, we should check the argument.
                     var argType = getEffectiveArgumentType(node, i) ||
                         checkExpressionWithContextualType(arg, paramType, excludeArgument && excludeArgument[i] ? identityMapper : undefined);
+                    // If one or more arguments are still excluded (as indicated by a non-null excludeArgument parameter),
+                    // we obtain the regular type of any object literal arguments because we may not have inferred complete
+                    // parameter types yet and therefore excess property checks may yield false positives (see #17041).
                     var checkArgType = excludeArgument ? getRegularTypeOfObjectLiteral(argType) : argType;
+                    // Use argument expression as error location when reporting errors
                     var errorNode = reportErrors ? getEffectiveArgumentErrorNode(node, i, arg) : undefined;
                     if (!checkTypeRelatedTo(checkArgType, paramType, relation, errorNode, headMessage)) {
                         return false;
@@ -37148,26 +45559,41 @@ var ts;
             }
             return true;
         }
+        /**
+         * Returns the this argument in calls like x.f(...) and x[f](...). Undefined otherwise.
+         */
         function getThisArgumentOfCall(node) {
-            if (node.kind === 187) {
+            if (node.kind === 187 /* CallExpression */) {
                 var callee = ts.skipOuterExpressions(node.expression);
-                if (callee.kind === 185 || callee.kind === 186) {
+                if (callee.kind === 185 /* PropertyAccessExpression */ || callee.kind === 186 /* ElementAccessExpression */) {
                     return callee.expression;
                 }
             }
         }
+        /**
+         * Returns the effective arguments for an expression that works like a function invocation.
+         *
+         * If 'node' is a CallExpression or a NewExpression, then its argument list is returned.
+         * If 'node' is a TaggedTemplateExpression, a new argument list is constructed from the substitution
+         *    expressions, where the first element of the list is `undefined`.
+         * If 'node' is a Decorator, the argument list will be `undefined`, and its arguments and types
+         *    will be supplied from calls to `getEffectiveArgumentCount` and `getEffectiveArgumentType`.
+         */
         function getEffectiveCallArguments(node) {
-            if (node.kind === 189) {
+            if (node.kind === 189 /* TaggedTemplateExpression */) {
                 var template = node.template;
-                var args_4 = [undefined];
-                if (template.kind === 202) {
+                var args_1 = [undefined]; // TODO: GH#18217
+                if (template.kind === 202 /* TemplateExpression */) {
                     ts.forEach(template.templateSpans, function (span) {
-                        args_4.push(span.expression);
+                        args_1.push(span.expression);
                     });
                 }
-                return args_4;
+                return args_1;
             }
-            else if (node.kind === 150) {
+            else if (node.kind === 150 /* Decorator */) {
+                // For a decorator, we return undefined as we will determine
+                // the number and types of arguments for a decorator using
+                // `getEffectiveArgumentCount` and `getEffectiveArgumentType` below.
                 return undefined;
             }
             else if (ts.isJsxOpeningLikeElement(node)) {
@@ -37177,22 +45603,45 @@ var ts;
                 return node.arguments || ts.emptyArray;
             }
         }
+        /**
+         * Returns the effective argument count for a node that works like a function invocation.
+         * If 'node' is a Decorator, the number of arguments is derived from the decoration
+         *    target and the signature:
+         *    If 'node.target' is a class declaration or class expression, the effective argument
+         *       count is 1.
+         *    If 'node.target' is a parameter declaration, the effective argument count is 3.
+         *    If 'node.target' is a property declaration, the effective argument count is 2.
+         *    If 'node.target' is a method or accessor declaration, the effective argument count
+         *       is 3, although it can be 2 if the signature only accepts two arguments, allowing
+         *       us to match a property decorator.
+         * Otherwise, the argument count is the length of the 'args' array.
+         */
         function getEffectiveArgumentCount(node, args, signature) {
-            if (node.kind === 150) {
+            if (node.kind === 150 /* Decorator */) {
                 switch (node.parent.kind) {
-                    case 235:
-                    case 205:
+                    case 235 /* ClassDeclaration */:
+                    case 205 /* ClassExpression */:
+                        // A class decorator will have one argument (see `ClassDecorator` in core.d.ts)
                         return 1;
-                    case 152:
+                    case 152 /* PropertyDeclaration */:
+                        // A property declaration decorator will have two arguments (see
+                        // `PropertyDecorator` in core.d.ts)
                         return 2;
-                    case 154:
-                    case 156:
-                    case 157:
-                        if (languageVersion === 0) {
+                    case 154 /* MethodDeclaration */:
+                    case 156 /* GetAccessor */:
+                    case 157 /* SetAccessor */:
+                        // A method or accessor declaration decorator will have two or three arguments (see
+                        // `PropertyDecorator` and `MethodDecorator` in core.d.ts)
+                        // If we are emitting decorators for ES3, we will only pass two arguments.
+                        if (languageVersion === 0 /* ES3 */) {
                             return 2;
                         }
+                        // If the method decorator signature only accepts a target and a key, we will only
+                        // type check those arguments.
                         return signature.parameters.length >= 3 ? 3 : 2;
-                    case 149:
+                    case 149 /* Parameter */:
+                        // A parameter declaration decorator will have three arguments (see
+                        // `ParameterDecorator` in core.d.ts)
                         return 3;
                     default:
                         return ts.Debug.fail();
@@ -37202,53 +45651,97 @@ var ts;
                 return args.length;
             }
         }
+        /**
+         * Returns the effective type of the first argument to a decorator.
+         * If 'node' is a class declaration or class expression, the effective argument type
+         *    is the type of the static side of the class.
+         * If 'node' is a parameter declaration, the effective argument type is either the type
+         *    of the static or instance side of the class for the parameter's parent method,
+         *    depending on whether the method is declared static.
+         *    For a constructor, the type is always the type of the static side of the class.
+         * If 'node' is a property, method, or accessor declaration, the effective argument
+         *    type is the type of the static or instance side of the parent class for class
+         *    element, depending on whether the element is declared static.
+         */
         function getEffectiveDecoratorFirstArgumentType(node) {
-            if (node.kind === 235) {
+            // The first argument to a decorator is its `target`.
+            if (node.kind === 235 /* ClassDeclaration */) {
+                // For a class decorator, the `target` is the type of the class (e.g. the
+                // "static" or "constructor" side of the class)
                 var classSymbol = getSymbolOfNode(node);
                 return getTypeOfSymbol(classSymbol);
             }
-            if (node.kind === 149) {
+            if (node.kind === 149 /* Parameter */) {
+                // For a parameter decorator, the `target` is the parent type of the
+                // parameter's containing method.
                 node = node.parent;
-                if (node.kind === 155) {
+                if (node.kind === 155 /* Constructor */) {
                     var classSymbol = getSymbolOfNode(node);
                     return getTypeOfSymbol(classSymbol);
                 }
             }
-            if (node.kind === 152 ||
-                node.kind === 154 ||
-                node.kind === 156 ||
-                node.kind === 157) {
+            if (node.kind === 152 /* PropertyDeclaration */ ||
+                node.kind === 154 /* MethodDeclaration */ ||
+                node.kind === 156 /* GetAccessor */ ||
+                node.kind === 157 /* SetAccessor */) {
+                // For a property or method decorator, the `target` is the
+                // "static"-side type of the parent of the member if the member is
+                // declared "static"; otherwise, it is the "instance"-side type of the
+                // parent of the member.
                 return getParentTypeOfClassElement(node);
             }
             ts.Debug.fail("Unsupported decorator target.");
             return errorType;
         }
+        /**
+         * Returns the effective type for the second argument to a decorator.
+         * If 'node' is a parameter, its effective argument type is one of the following:
+         *    If 'node.parent' is a constructor, the effective argument type is 'any', as we
+         *       will emit `undefined`.
+         *    If 'node.parent' is a member with an identifier, numeric, or string literal name,
+         *       the effective argument type will be a string literal type for the member name.
+         *    If 'node.parent' is a computed property name, the effective argument type will
+         *       either be a symbol type or the string type.
+         * If 'node' is a member with an identifier, numeric, or string literal name, the
+         *    effective argument type will be a string literal type for the member name.
+         * If 'node' is a computed property name, the effective argument type will either
+         *    be a symbol type or the string type.
+         * A class decorator does not have a second argument type.
+         */
         function getEffectiveDecoratorSecondArgumentType(node) {
-            if (node.kind === 235) {
+            // The second argument to a decorator is its `propertyKey`
+            if (node.kind === 235 /* ClassDeclaration */) {
                 ts.Debug.fail("Class decorators should not have a second synthetic argument.");
                 return errorType;
             }
-            if (node.kind === 149) {
+            if (node.kind === 149 /* Parameter */) {
                 node = node.parent;
-                if (node.kind === 155) {
+                if (node.kind === 155 /* Constructor */) {
+                    // For a constructor parameter decorator, the `propertyKey` will be `undefined`.
                     return anyType;
                 }
+                // For a non-constructor parameter decorator, the `propertyKey` will be either
+                // a string or a symbol, based on the name of the parameter's containing method.
             }
-            if (node.kind === 152 ||
-                node.kind === 154 ||
-                node.kind === 156 ||
-                node.kind === 157) {
+            if (node.kind === 152 /* PropertyDeclaration */ ||
+                node.kind === 154 /* MethodDeclaration */ ||
+                node.kind === 156 /* GetAccessor */ ||
+                node.kind === 157 /* SetAccessor */) {
+                // The `propertyKey` for a property or method decorator will be a
+                // string literal type if the member name is an identifier, number, or string;
+                // otherwise, if the member name is a computed property name it will
+                // be either string or symbol.
                 var element = node;
                 var name = element.name;
                 switch (name.kind) {
-                    case 71:
+                    case 71 /* Identifier */:
                         return getLiteralType(ts.idText(name));
-                    case 8:
-                    case 9:
+                    case 8 /* NumericLiteral */:
+                    case 9 /* StringLiteral */:
                         return getLiteralType(name.text);
-                    case 147:
+                    case 147 /* ComputedPropertyName */:
                         var nameType = checkComputedPropertyName(name);
-                        if (isTypeAssignableToKind(nameType, 3072)) {
+                        if (isTypeAssignableToKind(nameType, 3072 /* ESSymbolLike */)) {
                             return nameType;
                         }
                         else {
@@ -37262,27 +45755,42 @@ var ts;
             ts.Debug.fail("Unsupported decorator target.");
             return errorType;
         }
+        /**
+         * Returns the effective argument type for the third argument to a decorator.
+         * If 'node' is a parameter, the effective argument type is the number type.
+         * If 'node' is a method or accessor, the effective argument type is a
+         *    `TypedPropertyDescriptor<T>` instantiated with the type of the member.
+         * Class and property decorators do not have a third effective argument.
+         */
         function getEffectiveDecoratorThirdArgumentType(node) {
-            if (node.kind === 235) {
+            // The third argument to a decorator is either its `descriptor` for a method decorator
+            // or its `parameterIndex` for a parameter decorator
+            if (node.kind === 235 /* ClassDeclaration */) {
                 ts.Debug.fail("Class decorators should not have a third synthetic argument.");
                 return errorType;
             }
-            if (node.kind === 149) {
+            if (node.kind === 149 /* Parameter */) {
+                // The `parameterIndex` for a parameter decorator is always a number
                 return numberType;
             }
-            if (node.kind === 152) {
+            if (node.kind === 152 /* PropertyDeclaration */) {
                 ts.Debug.fail("Property decorators should not have a third synthetic argument.");
                 return errorType;
             }
-            if (node.kind === 154 ||
-                node.kind === 156 ||
-                node.kind === 157) {
-                var propertyType = getTypeOfNode(node);
+            if (node.kind === 154 /* MethodDeclaration */ ||
+                node.kind === 156 /* GetAccessor */ ||
+                node.kind === 157 /* SetAccessor */) {
+                // The `descriptor` for a method decorator will be a `TypedPropertyDescriptor<T>`
+                // for the type of the member.
+                var propertyType = getTypeOfNode(node); // TODO: GH#18217
                 return createTypedPropertyDescriptorType(propertyType);
             }
             ts.Debug.fail("Unsupported decorator target.");
             return errorType;
         }
+        /**
+         * Returns the effective argument type for the provided argument to a decorator.
+         */
         function getEffectiveDecoratorArgumentType(node, argIndex) {
             if (argIndex === 0) {
                 return getEffectiveDecoratorFirstArgumentType(node.parent);
@@ -37296,27 +45804,44 @@ var ts;
             ts.Debug.fail("Decorators should not have a fourth synthetic argument.");
             return errorType;
         }
+        /**
+         * Gets the effective argument type for an argument in a call expression.
+         */
         function getEffectiveArgumentType(node, argIndex) {
-            if (node.kind === 150) {
+            // Decorators provide special arguments, a tagged template expression provides
+            // a special first argument, and string literals get string literal types
+            // unless we're reporting errors
+            if (node.kind === 150 /* Decorator */) {
                 return getEffectiveDecoratorArgumentType(node, argIndex);
             }
-            else if (argIndex === 0 && node.kind === 189) {
+            else if (argIndex === 0 && node.kind === 189 /* TaggedTemplateExpression */) {
                 return getGlobalTemplateStringsArrayType();
             }
+            // This is not a synthetic argument, so we return 'undefined'
+            // to signal that the caller needs to check the argument.
             return undefined;
         }
+        /**
+         * Gets the effective argument expression for an argument in a call expression.
+         */
         function getEffectiveArgument(node, args, argIndex) {
-            if (node.kind === 150 ||
-                (argIndex === 0 && node.kind === 189)) {
+            // For a decorator or the first argument of a tagged template expression we return undefined.
+            if (node.kind === 150 /* Decorator */ ||
+                (argIndex === 0 && node.kind === 189 /* TaggedTemplateExpression */)) {
                 return undefined;
             }
             return args[argIndex];
         }
+        /**
+         * Gets the error node to use when reporting errors for an effective argument.
+         */
         function getEffectiveArgumentErrorNode(node, argIndex, arg) {
-            if (node.kind === 150) {
+            if (node.kind === 150 /* Decorator */) {
+                // For a decorator, we use the expression of the decorator for error reporting.
                 return node.expression;
             }
-            else if (argIndex === 0 && node.kind === 189) {
+            else if (argIndex === 0 && node.kind === 189 /* TaggedTemplateExpression */) {
+                // For a the first argument of a tagged template expression, we use the template of the tag for error reporting.
                 return node.template;
             }
             else {
@@ -37335,27 +45860,45 @@ var ts;
             return ts.createDiagnosticForNodeArray(ts.getSourceFileOfNode(node), typeArguments, ts.Diagnostics.Expected_0_type_arguments_but_got_1, paramCount, typeArguments.length);
         }
         function resolveCall(node, signatures, candidatesOutArray, fallbackError) {
-            var isTaggedTemplate = node.kind === 189;
-            var isDecorator = node.kind === 150;
+            var isTaggedTemplate = node.kind === 189 /* TaggedTemplateExpression */;
+            var isDecorator = node.kind === 150 /* Decorator */;
             var isJsxOpeningOrSelfClosingElement = ts.isJsxOpeningLikeElement(node);
             var typeArguments;
             if (!isDecorator) {
                 typeArguments = node.typeArguments;
-                if (isTaggedTemplate || isJsxOpeningOrSelfClosingElement || node.expression.kind !== 97) {
+                // We already perform checking on the type arguments on the class declaration itself.
+                if (isTaggedTemplate || isJsxOpeningOrSelfClosingElement || node.expression.kind !== 97 /* SuperKeyword */) {
                     ts.forEach(typeArguments, checkSourceElement);
                 }
             }
             var candidates = candidatesOutArray || [];
+            // reorderCandidates fills up the candidates array directly
             reorderCandidates(signatures, candidates);
             if (!candidates.length) {
                 diagnostics.add(ts.createDiagnosticForNode(node, ts.Diagnostics.Call_target_does_not_contain_any_signatures));
                 return resolveErrorCall(node);
             }
             var args = getEffectiveCallArguments(node);
+            // The following applies to any value of 'excludeArgument[i]':
+            //    - true:      the argument at 'i' is susceptible to a one-time permanent contextual typing.
+            //    - undefined: the argument at 'i' is *not* susceptible to permanent contextual typing.
+            //    - false:     the argument at 'i' *was* and *has been* permanently contextually typed.
+            //
+            // The idea is that we will perform type argument inference & assignability checking once
+            // without using the susceptible parameters that are functions, and once more for each of those
+            // parameters, contextually typing each as we go along.
+            //
+            // For a tagged template, then the first argument be 'undefined' if necessary
+            // because it represents a TemplateStringsArray.
+            //
+            // For a decorator, no arguments are susceptible to contextual typing due to the fact
+            // decorators are applied to a declaration by the emitter, and not to an expression.
             var isSingleNonGenericCandidate = candidates.length === 1 && !candidates[0].typeParameters;
             var excludeArgument;
             var excludeCount = 0;
             if (!isDecorator && !isSingleNonGenericCandidate) {
+                // We do not need to call `getEffectiveArgumentCount` here as it only
+                // applies when calculating the number of arguments for a decorator.
                 for (var i = isTaggedTemplate ? 1 : 0; i < args.length; i++) {
                     if (isContextSensitive(args[i])) {
                         if (!excludeArgument) {
@@ -37366,10 +45909,43 @@ var ts;
                     }
                 }
             }
+            // The following variables are captured and modified by calls to chooseOverload.
+            // If overload resolution or type argument inference fails, we want to report the
+            // best error possible. The best error is one which says that an argument was not
+            // assignable to a parameter. This implies that everything else about the overload
+            // was fine. So if there is any overload that is only incorrect because of an
+            // argument, we will report an error on that one.
+            //
+            //     function foo(s: string): void;
+            //     function foo(n: number): void; // Report argument error on this overload
+            //     function foo(): void;
+            //     foo(true);
+            //
+            // If none of the overloads even made it that far, there are two possibilities.
+            // There was a problem with type arguments for some overload, in which case
+            // report an error on that. Or none of the overloads even had correct arity,
+            // in which case give an arity error.
+            //
+            //     function foo<T extends string>(x: T): void; // Report type argument error
+            //     function foo(): void;
+            //     foo<number>(0);
+            //
             var candidateForArgumentError;
             var candidateForTypeArgumentError;
             var result;
-            var signatureHelpTrailingComma = candidatesOutArray && node.kind === 187 && node.arguments.hasTrailingComma;
+            // If we are in signature help, a trailing comma indicates that we intend to provide another argument,
+            // so we will only accept overloads with arity at least 1 higher than the current number of provided arguments.
+            var signatureHelpTrailingComma = candidatesOutArray && node.kind === 187 /* CallExpression */ && node.arguments.hasTrailingComma;
+            // Section 4.12.1:
+            // if the candidate list contains one or more signatures for which the type of each argument
+            // expression is a subtype of each corresponding parameter type, the return type of the first
+            // of those signatures becomes the return type of the function call.
+            // Otherwise, the return type of the first signature in the candidate list becomes the return
+            // type of the function call.
+            //
+            // Whether the call is an error is determined by assignability of the arguments. The subtype pass
+            // is just important for choosing the best signature. So in the case where there is only one
+            // signature, the subtype pass is useless. So skipping it is an optimization.
             if (candidates.length > 1) {
                 result = chooseOverload(candidates, subtypeRelation, signatureHelpTrailingComma);
             }
@@ -37379,14 +45955,24 @@ var ts;
             if (result) {
                 return result;
             }
+            // No signatures were applicable. Now report errors based on the last applicable signature with
+            // no arguments excluded from assignability checks.
+            // If candidate is undefined, it means that no candidates had a suitable arity. In that case,
+            // skip the checkApplicableSignature check.
             if (candidateForArgumentError) {
                 if (isJsxOpeningOrSelfClosingElement) {
+                    // We do not report any error here because any error will be handled in "resolveCustomJsxElementAttributesType".
                     return candidateForArgumentError;
                 }
-                checkApplicableSignature(node, args, candidateForArgumentError, assignableRelation, undefined, true);
+                // excludeArgument is undefined, in this case also equivalent to [undefined, undefined, ...]
+                // The importance of excludeArgument is to prevent us from typing function expression parameters
+                // in arguments too early. If possible, we'd like to only type them once we know the correct
+                // overload. However, this matters for the case where the call is correct. When the call is
+                // an error, we don't need to exclude any arguments, although it would cause no harm to do so.
+                checkApplicableSignature(node, args, candidateForArgumentError, assignableRelation, /*excludeArgument*/ undefined, /*reportErrors*/ true);
             }
             else if (candidateForTypeArgumentError) {
-                checkTypeArguments(candidateForTypeArgumentError, node.typeArguments, true, fallbackError);
+                checkTypeArguments(candidateForTypeArgumentError, node.typeArguments, /*reportErrors*/ true, fallbackError);
             }
             else if (typeArguments && ts.every(signatures, function (sig) { return ts.length(sig.typeParameters) !== typeArguments.length; })) {
                 diagnostics.add(getTypeArgumentArityError(node, signatures, typeArguments));
@@ -37417,13 +46003,21 @@ var ts;
             else if (fallbackError) {
                 diagnostics.add(ts.createDiagnosticForNode(node, fallbackError));
             }
+            // No signature was applicable. We have already reported the errors for the invalid signature.
+            // If this is a type resolution session, e.g. Language Service, try to get better information than anySignature.
+            // Pick the longest signature. This way we can get a contextual type for cases like:
+            //     declare function f(a: { xa: number; xb: number; }, b: number);
+            //     f({ |
+            // Also, use explicitly-supplied type arguments if they are provided, so we can get a contextual signature in cases like:
+            //     declare function f<T>(k: keyof T);
+            //     f<Foo>("
             if (!produceDiagnostics) {
-                ts.Debug.assert(candidates.length > 0);
+                ts.Debug.assert(candidates.length > 0); // Else would have exited above.
                 var bestIndex = getLongestCandidateIndex(candidates, apparentArgumentCount === undefined ? args.length : apparentArgumentCount);
                 var candidate = candidates[bestIndex];
                 var typeParameters = candidate.typeParameters;
                 if (typeParameters && callLikeExpressionMayHaveTypeArguments(node) && node.typeArguments) {
-                    var typeArguments_1 = node.typeArguments.map(getTypeOfNode);
+                    var typeArguments_1 = node.typeArguments.map(getTypeOfNode); // TODO: GH#18217
                     while (typeArguments_1.length > typeParameters.length) {
                         typeArguments_1.pop();
                     }
@@ -37446,7 +46040,7 @@ var ts;
                     if (!hasCorrectArity(node, args, candidate, signatureHelpTrailingComma)) {
                         return undefined;
                     }
-                    if (!checkApplicableSignature(node, args, candidate, relation, excludeArgument, false)) {
+                    if (!checkApplicableSignature(node, args, candidate, relation, excludeArgument, /*reportErrors*/ false)) {
                         candidateForArgumentError = candidate;
                         return undefined;
                     }
@@ -37459,14 +46053,14 @@ var ts;
                     }
                     var candidate = void 0;
                     var inferenceContext = originalCandidate.typeParameters ?
-                        createInferenceContext(originalCandidate.typeParameters, originalCandidate, ts.isInJavaScriptFile(node) ? 4 : 0) :
+                        createInferenceContext(originalCandidate.typeParameters, originalCandidate, /*flags*/ ts.isInJavaScriptFile(node) ? 4 /* AnyDefault */ : 0 /* None */) :
                         undefined;
                     while (true) {
                         candidate = originalCandidate;
                         if (candidate.typeParameters) {
                             var typeArgumentTypes = void 0;
                             if (typeArguments) {
-                                var typeArgumentResult = checkTypeArguments(candidate, typeArguments, false);
+                                var typeArgumentResult = checkTypeArguments(candidate, typeArguments, /*reportErrors*/ false);
                                 if (typeArgumentResult) {
                                     typeArgumentTypes = typeArgumentResult;
                                 }
@@ -37481,7 +46075,7 @@ var ts;
                             var isJavascript = ts.isInJavaScriptFile(candidate.declaration);
                             candidate = getSignatureInstantiation(candidate, typeArgumentTypes, isJavascript);
                         }
-                        if (!checkApplicableSignature(node, args, candidate, relation, excludeArgument, false)) {
+                        if (!checkApplicableSignature(node, args, candidate, relation, excludeArgument, /*reportErrors*/ false)) {
                             candidateForArgumentError = candidate;
                             break;
                         }
@@ -37491,7 +46085,7 @@ var ts;
                         }
                         excludeCount--;
                         if (excludeCount > 0) {
-                            excludeArgument[excludeArgument.indexOf(true)] = false;
+                            excludeArgument[excludeArgument.indexOf(/*value*/ true)] = false;
                         }
                         else {
                             excludeArgument = undefined;
@@ -37517,13 +46111,15 @@ var ts;
             return maxParamsIndex;
         }
         function resolveCallExpression(node, candidatesOutArray) {
-            if (node.expression.kind === 97) {
+            if (node.expression.kind === 97 /* SuperKeyword */) {
                 var superType = checkSuperExpression(node.expression);
                 if (isTypeAny(superType)) {
-                    ts.forEach(node.arguments, checkExpression);
+                    ts.forEach(node.arguments, checkExpresionNoReturn); // Still visit arguments so they get marked for visibility, etc
                     return anySignature;
                 }
                 if (superType !== errorType) {
+                    // In super call, the candidate signatures are the matching arity signatures of the base constructor function instantiated
+                    // with the type arguments specified in the extends clause.
                     var baseTypeNode = ts.getClassExtendsHeritageClauseElement(ts.getContainingClass(node));
                     if (baseTypeNode) {
                         var baseConstructors = getInstantiatedConstructorsForTypeArguments(superType, baseTypeNode.typeArguments, baseTypeNode);
@@ -37538,33 +46134,52 @@ var ts;
             }
             var apparentType = getApparentType(funcType);
             if (apparentType === errorType) {
+                // Another error has already been reported
                 return resolveErrorCall(node);
             }
-            var callSignatures = getSignaturesOfType(apparentType, 0);
-            var constructSignatures = getSignaturesOfType(apparentType, 1);
+            // Technically, this signatures list may be incomplete. We are taking the apparent type,
+            // but we are not including call signatures that may have been added to the Object or
+            // Function interface, since they have none by default. This is a bit of a leap of faith
+            // that the user will not add any.
+            var callSignatures = getSignaturesOfType(apparentType, 0 /* Call */);
+            var constructSignatures = getSignaturesOfType(apparentType, 1 /* Construct */);
+            // TS 1.0 Spec: 4.12
+            // In an untyped function call no TypeArgs are permitted, Args can be any argument list, no contextual
+            // types are provided for the argument expressions, and the result is always of type Any.
             if (isUntypedFunctionCall(funcType, apparentType, callSignatures.length, constructSignatures.length)) {
+                // The unknownType indicates that an error already occurred (and was reported).  No
+                // need to report another error in this case.
                 if (funcType !== errorType && node.typeArguments) {
                     error(node, ts.Diagnostics.Untyped_function_calls_may_not_accept_type_arguments);
                 }
                 return resolveUntypedCall(node);
             }
+            // If FuncExpr's apparent type(section 3.8.1) is a function type, the call is a typed function call.
+            // TypeScript employs overload resolution in typed function calls in order to support functions
+            // with multiple call signatures.
             if (!callSignatures.length) {
                 if (constructSignatures.length) {
                     error(node, ts.Diagnostics.Value_of_type_0_is_not_callable_Did_you_mean_to_include_new, typeToString(funcType));
                 }
                 else {
-                    invocationError(node, apparentType, 0);
+                    invocationError(node, apparentType, 0 /* Call */);
                 }
                 return resolveErrorCall(node);
             }
             return resolveCall(node, callSignatures, candidatesOutArray);
         }
+        /**
+         * TS 1.0 spec: 4.12
+         * If FuncExpr is of type Any, or of an object type that has no call or construct signatures
+         * but is a subtype of the Function interface, the call is an untyped function call.
+         */
         function isUntypedFunctionCall(funcType, apparentFuncType, numCallSignatures, numConstructSignatures) {
-            return isTypeAny(funcType) || isTypeAny(apparentFuncType) && funcType.flags & 65536 ||
-                !numCallSignatures && !numConstructSignatures && !(apparentFuncType.flags & (262144 | 32768)) && isTypeAssignableTo(funcType, globalFunctionType);
+            // We exclude union types because we may have a union of function types that happen to have no common signatures.
+            return isTypeAny(funcType) || isTypeAny(apparentFuncType) && funcType.flags & 65536 /* TypeParameter */ ||
+                !numCallSignatures && !numConstructSignatures && !(apparentFuncType.flags & (262144 /* Union */ | 32768 /* Never */)) && isTypeAssignableTo(funcType, globalFunctionType);
         }
         function resolveNewExpression(node, candidatesOutArray) {
-            if (node.arguments && languageVersion < 1) {
+            if (node.arguments && languageVersion < 1 /* ES5 */) {
                 var spreadIndex = getSpreadArgumentIndex(node.arguments);
                 if (spreadIndex >= 0) {
                     error(node.arguments[spreadIndex], ts.Diagnostics.Spread_operator_in_new_expressions_is_only_available_when_targeting_ECMAScript_5_and_higher);
@@ -37574,29 +46189,50 @@ var ts;
             if (expressionType === silentNeverType) {
                 return silentNeverSignature;
             }
+            // If expressionType's apparent type(section 3.8.1) is an object type with one or
+            // more construct signatures, the expression is processed in the same manner as a
+            // function call, but using the construct signatures as the initial set of candidate
+            // signatures for overload resolution. The result type of the function call becomes
+            // the result type of the operation.
             expressionType = getApparentType(expressionType);
             if (expressionType === errorType) {
+                // Another error has already been reported
                 return resolveErrorCall(node);
             }
+            // TS 1.0 spec: 4.11
+            // If expressionType is of type Any, Args can be any argument
+            // list and the result of the operation is of type Any.
             if (isTypeAny(expressionType)) {
                 if (node.typeArguments) {
                     error(node, ts.Diagnostics.Untyped_function_calls_may_not_accept_type_arguments);
                 }
                 return resolveUntypedCall(node);
             }
-            var constructSignatures = getSignaturesOfType(expressionType, 1);
+            // Technically, this signatures list may be incomplete. We are taking the apparent type,
+            // but we are not including construct signatures that may have been added to the Object or
+            // Function interface, since they have none by default. This is a bit of a leap of faith
+            // that the user will not add any.
+            var constructSignatures = getSignaturesOfType(expressionType, 1 /* Construct */);
             if (constructSignatures.length) {
                 if (!isConstructorAccessible(node, constructSignatures[0])) {
                     return resolveErrorCall(node);
                 }
+                // If the expression is a class of abstract type, then it cannot be instantiated.
+                // Note, only class declarations can be declared abstract.
+                // In the case of a merged class-module or class-interface declaration,
+                // only the class declaration node will have the Abstract flag set.
                 var valueDecl = expressionType.symbol && ts.getClassLikeDeclarationOfSymbol(expressionType.symbol);
-                if (valueDecl && ts.hasModifier(valueDecl, 128)) {
+                if (valueDecl && ts.hasModifier(valueDecl, 128 /* Abstract */)) {
                     error(node, ts.Diagnostics.Cannot_create_an_instance_of_an_abstract_class);
                     return resolveErrorCall(node);
                 }
                 return resolveCall(node, constructSignatures, candidatesOutArray);
             }
-            var callSignatures = getSignaturesOfType(expressionType, 0);
+            // If expressionType's apparent type is an object type with no construct signatures but
+            // one or more call signatures, the expression is processed as a function call. A compile-time
+            // error occurs if the result of the function call is not Void. The type of the result of the
+            // operation is Any. It is an error to have a Void this type.
+            var callSignatures = getSignaturesOfType(expressionType, 0 /* Call */);
             if (callSignatures.length) {
                 var signature = resolveCall(node, callSignatures, candidatesOutArray);
                 if (!isJavaScriptConstructor(signature.declaration) && getReturnTypeOfSignature(signature) !== voidType) {
@@ -37607,7 +46243,7 @@ var ts;
                 }
                 return signature;
             }
-            invocationError(node, expressionType, 1);
+            invocationError(node, expressionType, 1 /* Construct */);
             return resolveErrorCall(node);
         }
         function isConstructorAccessible(node, signature) {
@@ -37615,12 +46251,14 @@ var ts;
                 return true;
             }
             var declaration = signature.declaration;
-            var modifiers = ts.getSelectedModifierFlags(declaration, 24);
+            var modifiers = ts.getSelectedModifierFlags(declaration, 24 /* NonPublicAccessibilityModifier */);
+            // Public constructor is accessible.
             if (!modifiers) {
                 return true;
             }
             var declaringClassDeclaration = ts.getClassLikeDeclarationOfSymbol(declaration.parent.symbol);
             var declaringClass = getDeclaredTypeOfSymbol(declaration.parent.symbol);
+            // A private or protected constructor can only be instantiated within its own class (or a subclass, for protected)
             if (!isNodeWithinClass(node, declaringClassDeclaration)) {
                 var containingClass = ts.getContainingClass(node);
                 if (containingClass) {
@@ -37628,17 +46266,17 @@ var ts;
                     var baseTypes = getBaseTypes(containingType);
                     while (baseTypes.length) {
                         var baseType = baseTypes[0];
-                        if (modifiers & 16 &&
+                        if (modifiers & 16 /* Protected */ &&
                             baseType.symbol === declaration.parent.symbol) {
                             return true;
                         }
                         baseTypes = getBaseTypes(baseType);
                     }
                 }
-                if (modifiers & 8) {
+                if (modifiers & 8 /* Private */) {
                     error(node, ts.Diagnostics.Constructor_of_class_0_is_private_and_only_accessible_within_the_class_declaration, typeToString(declaringClass));
                 }
-                if (modifiers & 16) {
+                if (modifiers & 16 /* Protected */) {
                     error(node, ts.Diagnostics.Constructor_of_class_0_is_protected_and_only_accessible_within_the_class_declaration, typeToString(declaringClass));
                 }
                 return false;
@@ -37646,7 +46284,7 @@ var ts;
             return true;
         }
         function invocationError(node, apparentType, kind) {
-            error(node, kind === 0
+            error(node, kind === 0 /* Call */
                 ? ts.Diagnostics.Cannot_invoke_an_expression_whose_type_lacks_a_call_signature_Type_0_has_no_compatible_call_signatures
                 : ts.Diagnostics.Cannot_use_new_with_an_expression_whose_type_lacks_a_call_or_construct_signature, typeToString(apparentType));
             invocationErrorRecovery(apparentType, kind);
@@ -37656,6 +46294,8 @@ var ts;
                 return;
             }
             var importNode = getSymbolLinks(apparentType.symbol).originatingImport;
+            // Create a diagnostic on the originating import if possible onto which we can attach a quickfix
+            //  An import call expression cannot be rewritten into another form to correct the error - the only solution is to use `.default` at the use-site
             if (importNode && !ts.isImportCall(importNode)) {
                 var sigs = getSignaturesOfType(getTypeOfSymbol(getSymbolLinks(apparentType.symbol).target), kind);
                 if (!sigs || !sigs.length)
@@ -37667,72 +46307,94 @@ var ts;
             var tagType = checkExpression(node.tag);
             var apparentType = getApparentType(tagType);
             if (apparentType === errorType) {
+                // Another error has already been reported
                 return resolveErrorCall(node);
             }
-            var callSignatures = getSignaturesOfType(apparentType, 0);
-            var constructSignatures = getSignaturesOfType(apparentType, 1);
+            var callSignatures = getSignaturesOfType(apparentType, 0 /* Call */);
+            var constructSignatures = getSignaturesOfType(apparentType, 1 /* Construct */);
             if (isUntypedFunctionCall(tagType, apparentType, callSignatures.length, constructSignatures.length)) {
                 return resolveUntypedCall(node);
             }
             if (!callSignatures.length) {
-                invocationError(node, apparentType, 0);
+                invocationError(node, apparentType, 0 /* Call */);
                 return resolveErrorCall(node);
             }
             return resolveCall(node, callSignatures, candidatesOutArray);
         }
+        /**
+         * Gets the localized diagnostic head message to use for errors when resolving a decorator as a call expression.
+         */
         function getDiagnosticHeadMessageForDecoratorResolution(node) {
             switch (node.parent.kind) {
-                case 235:
-                case 205:
+                case 235 /* ClassDeclaration */:
+                case 205 /* ClassExpression */:
                     return ts.Diagnostics.Unable_to_resolve_signature_of_class_decorator_when_called_as_an_expression;
-                case 149:
+                case 149 /* Parameter */:
                     return ts.Diagnostics.Unable_to_resolve_signature_of_parameter_decorator_when_called_as_an_expression;
-                case 152:
+                case 152 /* PropertyDeclaration */:
                     return ts.Diagnostics.Unable_to_resolve_signature_of_property_decorator_when_called_as_an_expression;
-                case 154:
-                case 156:
-                case 157:
+                case 154 /* MethodDeclaration */:
+                case 156 /* GetAccessor */:
+                case 157 /* SetAccessor */:
                     return ts.Diagnostics.Unable_to_resolve_signature_of_method_decorator_when_called_as_an_expression;
                 default:
                     return ts.Debug.fail();
             }
         }
+        /**
+         * Resolves a decorator as if it were a call expression.
+         */
         function resolveDecorator(node, candidatesOutArray) {
             var funcType = checkExpression(node.expression);
             var apparentType = getApparentType(funcType);
             if (apparentType === errorType) {
                 return resolveErrorCall(node);
             }
-            var callSignatures = getSignaturesOfType(apparentType, 0);
-            var constructSignatures = getSignaturesOfType(apparentType, 1);
+            var callSignatures = getSignaturesOfType(apparentType, 0 /* Call */);
+            var constructSignatures = getSignaturesOfType(apparentType, 1 /* Construct */);
             if (isUntypedFunctionCall(funcType, apparentType, callSignatures.length, constructSignatures.length)) {
                 return resolveUntypedCall(node);
             }
             if (isPotentiallyUncalledDecorator(node, callSignatures)) {
-                var nodeStr = ts.getTextOfNode(node.expression, false);
+                var nodeStr = ts.getTextOfNode(node.expression, /*includeTrivia*/ false);
                 error(node, ts.Diagnostics._0_accepts_too_few_arguments_to_be_used_as_a_decorator_here_Did_you_mean_to_call_it_first_and_write_0, nodeStr);
                 return resolveErrorCall(node);
             }
             var headMessage = getDiagnosticHeadMessageForDecoratorResolution(node);
             if (!callSignatures.length) {
-                var errorInfo = ts.chainDiagnosticMessages(undefined, ts.Diagnostics.Cannot_invoke_an_expression_whose_type_lacks_a_call_signature_Type_0_has_no_compatible_call_signatures, typeToString(apparentType));
+                var errorInfo = ts.chainDiagnosticMessages(/*details*/ undefined, ts.Diagnostics.Cannot_invoke_an_expression_whose_type_lacks_a_call_signature_Type_0_has_no_compatible_call_signatures, typeToString(apparentType));
                 errorInfo = ts.chainDiagnosticMessages(errorInfo, headMessage);
                 diagnostics.add(ts.createDiagnosticForNodeFromMessageChain(node, errorInfo));
-                invocationErrorRecovery(apparentType, 0);
+                invocationErrorRecovery(apparentType, 0 /* Call */);
                 return resolveErrorCall(node);
             }
             return resolveCall(node, callSignatures, candidatesOutArray, headMessage);
         }
+        /**
+         * Sometimes, we have a decorator that could accept zero arguments,
+         * but is receiving too many arguments as part of the decorator invocation.
+         * In those cases, a user may have meant to *call* the expression before using it as a decorator.
+         */
         function isPotentiallyUncalledDecorator(decorator, signatures) {
             return signatures.length && ts.every(signatures, function (signature) {
                 return signature.minArgumentCount === 0 &&
                     !signature.hasRestParameter &&
-                    signature.parameters.length < getEffectiveArgumentCount(decorator, undefined, signature);
+                    signature.parameters.length < getEffectiveArgumentCount(decorator, /*args*/ undefined, signature);
             });
         }
+        /**
+         * This function is similar to getResolvedSignature but is exclusively for trying to resolve JSX stateless-function component.
+         * The main reason we have to use this function instead of getResolvedSignature because, the caller of this function will already check the type of openingLikeElement's tagName
+         * and pass the type as elementType. The elementType can not be a union (as such case should be handled by the caller of this function)
+         * Note: at this point, we are still not sure whether the opening-like element is a stateless function component or not.
+         * @param openingLikeElement an opening-like JSX element to try to resolve as JSX stateless function
+         * @param elementType an element type of the opneing-like element by checking opening-like element's tagname.
+         * @param candidatesOutArray an array of signature to be filled in by the function. It is passed by signature help in the language service;
+         *                           the function will fill it up with appropriate candidate signatures
+         */
         function getResolvedJsxStatelessFunctionSignature(openingLikeElement, elementType, candidatesOutArray) {
-            ts.Debug.assert(!(elementType.flags & 262144));
-            var callSignatures = elementType && getSignaturesOfType(elementType, 0);
+            ts.Debug.assert(!(elementType.flags & 262144 /* Union */));
+            var callSignatures = elementType && getSignaturesOfType(elementType, 0 /* Call */);
             if (callSignatures && callSignatures.length > 0) {
                 return resolveCall(openingLikeElement, callSignatures, candidatesOutArray);
             }
@@ -37740,16 +46402,17 @@ var ts;
         }
         function resolveSignature(node, candidatesOutArray) {
             switch (node.kind) {
-                case 187:
+                case 187 /* CallExpression */:
                     return resolveCallExpression(node, candidatesOutArray);
-                case 188:
+                case 188 /* NewExpression */:
                     return resolveNewExpression(node, candidatesOutArray);
-                case 189:
+                case 189 /* TaggedTemplateExpression */:
                     return resolveTaggedTemplateExpression(node, candidatesOutArray);
-                case 150:
+                case 150 /* Decorator */:
                     return resolveDecorator(node, candidatesOutArray);
-                case 257:
-                case 256:
+                case 257 /* JsxOpeningElement */:
+                case 256 /* JsxSelfClosingElement */:
+                    // This code-path is called by language service
                     var exprTypes = checkExpression(node.tagName);
                     return forEachType(exprTypes, function (exprType) {
                         var sfcResult = getResolvedJsxStatelessFunctionSignature(node, exprType, candidatesOutArray);
@@ -37765,21 +46428,41 @@ var ts;
             }
             throw ts.Debug.assertNever(node, "Branch in 'resolveSignature' should be unreachable.");
         }
+        /**
+         * Resolve a signature of a given call-like expression.
+         * @param node a call-like expression to try resolve a signature for
+         * @param candidatesOutArray an array of signature to be filled in by the function. It is passed by signature help in the language service;
+         *                           the function will fill it up with appropriate candidate signatures
+         * @return a signature of the call-like expression or undefined if one can't be found
+         */
         function getResolvedSignature(node, candidatesOutArray) {
             var links = getNodeLinks(node);
+            // If getResolvedSignature has already been called, we will have cached the resolvedSignature.
+            // However, it is possible that either candidatesOutArray was not passed in the first time,
+            // or that a different candidatesOutArray was passed in. Therefore, we need to redo the work
+            // to correctly fill the candidatesOutArray.
             var cached = links.resolvedSignature;
             if (cached && cached !== resolvingSignature && !candidatesOutArray) {
                 return cached;
             }
             links.resolvedSignature = resolvingSignature;
             var result = resolveSignature(node, candidatesOutArray);
+            // If signature resolution originated in control flow type analysis (for example to compute the
+            // assigned type in a flow assignment) we don't cache the result as it may be based on temporary
+            // types from the control flow analysis.
             links.resolvedSignature = flowLoopStart === flowLoopCount ? result : cached;
             return result;
         }
+        /**
+         * Indicates whether a declaration can be treated as a constructor in a JavaScript
+         * file.
+         */
         function isJavaScriptConstructor(node) {
             if (node && ts.isInJavaScriptFile(node)) {
+                // If the node has a @class tag, treat it like a constructor.
                 if (ts.getJSDocClassTag(node))
                     return true;
+                // If the symbol of the node has members, treat it like a constructor.
                 var symbol = ts.isFunctionDeclaration(node) || ts.isFunctionExpression(node) ? getSymbolOfNode(node) :
                     ts.isVariableDeclaration(node) && node.initializer && ts.isFunctionExpression(node.initializer) ? getSymbolOfNode(node.initializer) :
                         undefined;
@@ -37818,10 +46501,10 @@ var ts;
                 return false;
             }
             var parent = node.parent;
-            while (parent && parent.kind === 185) {
+            while (parent && parent.kind === 185 /* PropertyAccessExpression */) {
                 parent = parent.parent;
             }
-            if (parent && ts.isBinaryExpression(parent) && ts.isPrototypeAccess(parent.left) && parent.operatorToken.kind === 58) {
+            if (parent && ts.isBinaryExpression(parent) && ts.isPrototypeAccess(parent.left) && parent.operatorToken.kind === 58 /* EqualsToken */) {
                 var right = ts.getInitializerOfBinaryExpression(parent);
                 return ts.isObjectLiteralExpression(right) && right;
             }
@@ -37829,31 +46512,41 @@ var ts;
         function getInferredClassType(symbol) {
             var links = getSymbolLinks(symbol);
             if (!links.inferredClassType) {
-                links.inferredClassType = createAnonymousType(symbol, getMembersOfSymbol(symbol) || emptySymbols, ts.emptyArray, ts.emptyArray, undefined, undefined);
+                links.inferredClassType = createAnonymousType(symbol, getMembersOfSymbol(symbol) || emptySymbols, ts.emptyArray, ts.emptyArray, /*stringIndexType*/ undefined, /*numberIndexType*/ undefined);
             }
             return links.inferredClassType;
         }
         function isInferredClassType(type) {
             return type.symbol
-                && ts.getObjectFlags(type) & 16
+                && ts.getObjectFlags(type) & 16 /* Anonymous */
                 && getSymbolLinks(type.symbol).inferredClassType === type;
         }
+        /**
+         * Syntactically and semantically checks a call or new expression.
+         * @param node The call/new expression to be checked.
+         * @returns On success, the expression's signature's return type. On failure, anyType.
+         */
         function checkCallExpression(node) {
             if (!checkGrammarTypeArguments(node, node.typeArguments))
                 checkGrammarArguments(node.arguments);
             var signature = getResolvedSignature(node);
-            if (node.expression.kind === 97) {
+            if (node.expression.kind === 97 /* SuperKeyword */) {
                 return voidType;
             }
-            if (node.kind === 188) {
+            if (node.kind === 188 /* NewExpression */) {
                 var declaration = signature.declaration;
                 if (declaration &&
-                    declaration.kind !== 155 &&
-                    declaration.kind !== 159 &&
-                    declaration.kind !== 164 &&
+                    declaration.kind !== 155 /* Constructor */ &&
+                    declaration.kind !== 159 /* ConstructSignature */ &&
+                    declaration.kind !== 164 /* ConstructorType */ &&
                     !ts.isJSDocConstructSignature(declaration)) {
+                    // When resolved signature is a call signature (and not a construct signature) the result type is any, unless
+                    // the declaring function had members created through 'x.prototype.y = expr' or 'this.y = expr' psuedodeclarations
+                    // in a JS file
+                    // Note:JS inferred classes might come from a variable declaration instead of a function declaration.
+                    // In this case, using getResolvedSymbol directly is required to avoid losing the members from the declaration.
                     var funcSymbol = checkExpression(node.expression).symbol;
-                    if (!funcSymbol && node.expression.kind === 71) {
+                    if (!funcSymbol && node.expression.kind === 71 /* Identifier */) {
                         funcSymbol = getResolvedSymbol(node.expression);
                     }
                     var type = funcSymbol && getJavaScriptClassType(funcSymbol);
@@ -37866,11 +46559,14 @@ var ts;
                     return anyType;
                 }
             }
+            // In JavaScript files, calls to any identifier 'require' are treated as external module imports
             if (ts.isInJavaScriptFile(node) && isCommonJsRequire(node)) {
                 return resolveExternalModuleTypeByLiteral(node.arguments[0]);
             }
             var returnType = getReturnTypeOfSignature(signature);
-            if (returnType.flags & 3072 && isSymbolOrSymbolForCall(node)) {
+            // Treat any call to the global 'Symbol' function that is part of a const variable or readonly property
+            // as a fresh unique symbol literal type.
+            if (returnType.flags & 3072 /* ESSymbolLike */ && isSymbolOrSymbolForCall(node)) {
                 return getESSymbolLikeTypeForNode(ts.walkUpParenthesizedExpressions(node.parent));
             }
             var jsAssignmentType;
@@ -37895,13 +46591,15 @@ var ts;
             if (!ts.isIdentifier(left) || left.escapedText !== "Symbol") {
                 return false;
             }
-            var globalESSymbol = getGlobalESSymbolConstructorSymbol(false);
+            // make sure `Symbol` is the global symbol
+            var globalESSymbol = getGlobalESSymbolConstructorSymbol(/*reportErrors*/ false);
             if (!globalESSymbol) {
                 return false;
             }
-            return globalESSymbol === resolveName(left, "Symbol", 67216319, undefined, undefined, false);
+            return globalESSymbol === resolveName(left, "Symbol", 67216319 /* Value */, /*nameNotFoundMessage*/ undefined, /*nameArg*/ undefined, /*isUse*/ false);
         }
         function checkImportCallExpression(node) {
+            // Check grammar of dynamic import
             if (!checkGrammarArguments(node.arguments))
                 checkGrammarImportCallExpression(node);
             if (node.arguments.length === 0) {
@@ -37909,15 +46607,17 @@ var ts;
             }
             var specifier = node.arguments[0];
             var specifierType = checkExpressionCached(specifier);
+            // Even though multiple arugments is grammatically incorrect, type-check extra arguments for completion
             for (var i = 1; i < node.arguments.length; ++i) {
                 checkExpressionCached(node.arguments[i]);
             }
-            if (specifierType.flags & 8192 || specifierType.flags & 16384 || !isTypeAssignableTo(specifierType, stringType)) {
+            if (specifierType.flags & 8192 /* Undefined */ || specifierType.flags & 16384 /* Null */ || !isTypeAssignableTo(specifierType, stringType)) {
                 error(specifier, ts.Diagnostics.Dynamic_import_s_specifier_must_be_of_type_string_but_here_has_type_0, typeToString(specifierType));
             }
+            // resolveExternalModuleName will return undefined if the moduleReferenceExpression is not a string literal
             var moduleSymbol = resolveExternalModuleName(node, specifier);
             if (moduleSymbol) {
-                var esModuleSymbol = resolveESModuleSymbol(moduleSymbol, specifier, true);
+                var esModuleSymbol = resolveESModuleSymbol(moduleSymbol, specifier, /*dontRecursivelyResolve*/ true);
                 if (esModuleSymbol) {
                     return createPromiseReturnType(node, getTypeWithSyntheticDefaultImportType(getTypeOfSymbol(esModuleSymbol), esModuleSymbol, moduleSymbol));
                 }
@@ -37929,16 +46629,16 @@ var ts;
                 var synthType = type;
                 if (!synthType.syntheticType) {
                     var file = ts.find(originalSymbol.declarations, ts.isSourceFile);
-                    var hasSyntheticDefault = canHaveSyntheticDefault(file, originalSymbol, false);
+                    var hasSyntheticDefault = canHaveSyntheticDefault(file, originalSymbol, /*dontResolveAlias*/ false);
                     if (hasSyntheticDefault) {
                         var memberTable = ts.createSymbolTable();
-                        var newSymbol = createSymbol(2097152, "default");
+                        var newSymbol = createSymbol(2097152 /* Alias */, "default" /* Default */);
                         newSymbol.target = resolveSymbol(symbol);
-                        memberTable.set("default", newSymbol);
-                        var anonymousSymbol = createSymbol(2048, "__type");
-                        var defaultContainingObject = createAnonymousType(anonymousSymbol, memberTable, ts.emptyArray, ts.emptyArray, undefined, undefined);
+                        memberTable.set("default" /* Default */, newSymbol);
+                        var anonymousSymbol = createSymbol(2048 /* TypeLiteral */, "__type" /* Type */);
+                        var defaultContainingObject = createAnonymousType(anonymousSymbol, memberTable, ts.emptyArray, ts.emptyArray, /*stringIndexInfo*/ undefined, /*numberIndexInfo*/ undefined);
                         anonymousSymbol.type = defaultContainingObject;
-                        synthType.syntheticType = isValidSpreadType(type) ? getSpreadType(type, defaultContainingObject, anonymousSymbol, 0, 0) : defaultContainingObject;
+                        synthType.syntheticType = isValidSpreadType(type) ? getSpreadType(type, defaultContainingObject, anonymousSymbol, /*typeFLags*/ 0, /*objectFlags*/ 0) : defaultContainingObject;
                     }
                     else {
                         synthType.syntheticType = type;
@@ -37949,33 +46649,36 @@ var ts;
             return type;
         }
         function isCommonJsRequire(node) {
-            if (!ts.isRequireCall(node, true)) {
+            if (!ts.isRequireCall(node, /*checkArgumentIsStringLiteralLike*/ true)) {
                 return false;
             }
+            // Make sure require is not a local function
             if (!ts.isIdentifier(node.expression))
                 return ts.Debug.fail();
-            var resolvedRequire = resolveName(node.expression, node.expression.escapedText, 67216319, undefined, undefined, true);
+            var resolvedRequire = resolveName(node.expression, node.expression.escapedText, 67216319 /* Value */, /*nameNotFoundMessage*/ undefined, /*nameArg*/ undefined, /*isUse*/ true); // TODO: GH#18217
             if (resolvedRequire === requireSymbol) {
                 return true;
             }
-            if (resolvedRequire.flags & 2097152) {
+            // project includes symbol named 'require' - make sure that it is ambient and local non-alias
+            if (resolvedRequire.flags & 2097152 /* Alias */) {
                 return false;
             }
-            var targetDeclarationKind = resolvedRequire.flags & 16
-                ? 234
-                : resolvedRequire.flags & 3
-                    ? 232
-                    : 0;
-            if (targetDeclarationKind !== 0) {
+            var targetDeclarationKind = resolvedRequire.flags & 16 /* Function */
+                ? 234 /* FunctionDeclaration */
+                : resolvedRequire.flags & 3 /* Variable */
+                    ? 232 /* VariableDeclaration */
+                    : 0 /* Unknown */;
+            if (targetDeclarationKind !== 0 /* Unknown */) {
                 var decl = ts.getDeclarationOfKind(resolvedRequire, targetDeclarationKind);
-                return !!decl && !!(decl.flags & 4194304);
+                // function/variable declaration should be ambient
+                return !!decl && !!(decl.flags & 4194304 /* Ambient */);
             }
             return false;
         }
         function checkTaggedTemplateExpression(node) {
             checkGrammarTypeArguments(node, node.typeArguments);
-            if (languageVersion < 2) {
-                checkExternalEmitHelpers(node, 65536);
+            if (languageVersion < 2 /* ES2015 */) {
+                checkExternalEmitHelpers(node, 65536 /* MakeTemplateObject */);
             }
             return getReturnTypeOfSignature(getResolvedSignature(node));
         }
@@ -37999,10 +46702,10 @@ var ts;
         }
         function checkMetaProperty(node) {
             checkGrammarMetaProperty(node);
-            if (node.keywordToken === 94) {
+            if (node.keywordToken === 94 /* NewKeyword */) {
                 return checkNewTargetMetaProperty(node);
             }
-            if (node.keywordToken === 91) {
+            if (node.keywordToken === 91 /* ImportKeyword */) {
                 return checkImportMetaProperty(node);
             }
             return ts.Debug.assertNever(node.keywordToken);
@@ -38013,7 +46716,7 @@ var ts;
                 error(node, ts.Diagnostics.Meta_property_0_is_only_allowed_in_the_body_of_a_function_declaration_function_expression_or_constructor, "new.target");
                 return errorType;
             }
-            else if (container.kind === 155) {
+            else if (container.kind === 155 /* Constructor */) {
                 var symbol = getSymbolOfNode(container.parent);
                 return getTypeOfSymbol(symbol);
             }
@@ -38023,11 +46726,11 @@ var ts;
             }
         }
         function checkImportMetaProperty(node) {
-            if (languageVersion < 6 || moduleKind < ts.ModuleKind.ESNext) {
+            if (languageVersion < 6 /* ESNext */ || moduleKind < ts.ModuleKind.ESNext) {
                 error(node, ts.Diagnostics.The_import_meta_meta_property_is_only_allowed_using_ESNext_for_the_target_and_module_compiler_options);
             }
             var file = ts.getSourceFileOfNode(node);
-            ts.Debug.assert(!!(file.flags & 1048576), "Containing file is missing import meta node flag.");
+            ts.Debug.assert(!!(file.flags & 1048576 /* PossiblyContainsImportMeta */), "Containing file is missing import meta node flag.");
             ts.Debug.assert(!!file.externalModuleIndicator, "Containing file should be a module.");
             return node.name.escapedText === "meta" ? getGlobalImportMetaType() : errorType;
         }
@@ -38070,7 +46773,7 @@ var ts;
                 var parameter = signature.thisParameter;
                 if (!parameter || parameter.valueDeclaration && !parameter.valueDeclaration.type) {
                     if (!parameter) {
-                        signature.thisParameter = createSymbolWithType(context.thisParameter, undefined);
+                        signature.thisParameter = createSymbolWithType(context.thisParameter, /*type*/ undefined);
                     }
                     assignTypeToParameterAndFixTypeParameters(signature.thisParameter, getTypeOfSymbol(context.thisParameter));
                 }
@@ -38084,6 +46787,7 @@ var ts;
                 }
             }
             if (signature.hasRestParameter && isRestParameterIndex(context, signature.parameters.length - 1)) {
+                // parameter might be a transient symbol generated by use of `arguments` in the function body.
                 var parameter = ts.last(signature.parameters);
                 if (isTransientSymbol(parameter) || !ts.getEffectiveTypeAnnotationNode(parameter.valueDeclaration)) {
                     var contextualParameterType = getTypeOfSymbol(ts.last(context.parameters));
@@ -38091,11 +46795,13 @@ var ts;
                 }
             }
         }
+        // When contextual typing assigns a type to a parameter that contains a binding pattern, we also need to push
+        // the destructured type into the contained binding elements.
         function assignBindingElementTypes(pattern) {
             for (var _i = 0, _a = pattern.elements; _i < _a.length; _i++) {
                 var element = _a[_i];
                 if (!ts.isOmittedExpression(element)) {
-                    if (element.name.kind === 71) {
+                    if (element.name.kind === 71 /* Identifier */) {
                         getSymbolLinks(getSymbolOfNode(element)).type = getTypeForBindingElement(element);
                     }
                     else {
@@ -38109,7 +46815,8 @@ var ts;
             if (!links.type) {
                 links.type = contextualType;
                 var decl = parameter.valueDeclaration;
-                if (decl.name.kind !== 71) {
+                if (decl.name.kind !== 71 /* Identifier */) {
+                    // if inference didn't come up with anything but {}, fall back to the binding pattern if present.
                     if (links.type === emptyObjectType) {
                         links.type = getTypeFromBindingPattern(decl.name);
                     }
@@ -38118,8 +46825,10 @@ var ts;
             }
         }
         function createPromiseType(promisedType) {
-            var globalPromiseType = getGlobalPromiseType(true);
+            // creates a `Promise<T>` type where `T` is the promisedType argument
+            var globalPromiseType = getGlobalPromiseType(/*reportErrors*/ true);
             if (globalPromiseType !== emptyGenericType) {
+                // if the promised type is itself a promise, get the underlying type; otherwise, fallback to the promised type
                 promisedType = getAwaitedType(promisedType) || emptyObjectType;
                 return createTypeReference(globalPromiseType, [promisedType]);
             }
@@ -38133,7 +46842,7 @@ var ts;
                     ts.Diagnostics.An_async_function_or_method_must_return_a_Promise_Make_sure_you_have_a_declaration_for_Promise_or_include_ES2015_in_your_lib_option);
                 return errorType;
             }
-            else if (!getGlobalPromiseConstructorSymbol(true)) {
+            else if (!getGlobalPromiseConstructorSymbol(/*reportErrors*/ true)) {
                 error(func, ts.isImportCall(func) ?
                     ts.Diagnostics.A_dynamic_import_call_in_ES5_SlashES3_requires_the_Promise_constructor_Make_sure_you_have_a_declaration_for_the_Promise_constructor_or_include_ES2015_in_your_lib_option :
                     ts.Diagnostics.An_async_function_or_method_in_ES5_SlashES3_requires_the_Promise_constructor_Make_sure_you_have_a_declaration_for_the_Promise_constructor_or_include_ES2015_in_your_lib_option);
@@ -38146,20 +46855,24 @@ var ts;
             }
             var functionFlags = ts.getFunctionFlags(func);
             var type;
-            if (func.body.kind !== 213) {
+            if (func.body.kind !== 213 /* Block */) {
                 type = checkExpressionCached(func.body, checkMode);
-                if (functionFlags & 2) {
-                    type = checkAwaitedType(type, func, ts.Diagnostics.The_return_type_of_an_async_function_must_either_be_a_valid_promise_or_must_not_contain_a_callable_then_member);
+                if (functionFlags & 2 /* Async */) {
+                    // From within an async function you can return either a non-promise value or a promise. Any
+                    // Promise/A+ compatible implementation will always assimilate any foreign promise, so the
+                    // return type of the body should be unwrapped to its awaited type, which we will wrap in
+                    // the native Promise<T> type later in this function.
+                    type = checkAwaitedType(type, /*errorNode*/ func, ts.Diagnostics.The_return_type_of_an_async_function_must_either_be_a_valid_promise_or_must_not_contain_a_callable_then_member);
                 }
             }
             else {
                 var types = checkAndAggregateReturnExpressionTypes(func, checkMode);
-                if (functionFlags & 1) {
+                if (functionFlags & 1 /* Generator */) { // Generator or AsyncGenerator function
                     types = ts.concatenate(checkAndAggregateYieldOperandTypes(func, checkMode), types);
                     if (!types || types.length === 0) {
-                        var iterableIteratorAny = functionFlags & 2
-                            ? createAsyncIterableIteratorType(anyType)
-                            : createIterableIteratorType(anyType);
+                        var iterableIteratorAny = functionFlags & 2 /* Async */
+                            ? createAsyncIterableIteratorType(anyType) // AsyncGenerator function
+                            : createIterableIteratorType(anyType); // Generator function
                         if (noImplicitAny) {
                             error(func.asteriskToken, ts.Diagnostics.Generator_implicitly_has_type_0_because_it_does_not_yield_any_values_Consider_supplying_a_return_type, typeToString(iterableIteratorAny));
                         }
@@ -38168,17 +46881,20 @@ var ts;
                 }
                 else {
                     if (!types) {
-                        return functionFlags & 2
-                            ? createPromiseReturnType(func, neverType)
-                            : neverType;
+                        // For an async function, the return type will not be never, but rather a Promise for never.
+                        return functionFlags & 2 /* Async */
+                            ? createPromiseReturnType(func, neverType) // Async function
+                            : neverType; // Normal function
                     }
                     if (types.length === 0) {
-                        return functionFlags & 2
-                            ? createPromiseReturnType(func, voidType)
-                            : voidType;
+                        // For an async function, the return type will not be void, but rather a Promise for void.
+                        return functionFlags & 2 /* Async */
+                            ? createPromiseReturnType(func, voidType) // Async function
+                            : voidType; // Normal function
                     }
                 }
-                type = getUnionType(types, 2);
+                // Return a union of the return expression types.
+                type = getUnionType(types, 2 /* Subtype */);
             }
             var contextualSignature = getContextualSignatureForFunctionLikeDeclaration(func);
             if (!contextualSignature) {
@@ -38189,14 +46905,14 @@ var ts;
                     contextualSignature === getSignatureFromDeclaration(func) ? type :
                         getReturnTypeOfSignature(contextualSignature);
                 if (contextualType) {
-                    switch (functionFlags & 3) {
-                        case 3:
-                            contextualType = getIteratedTypeOfGenerator(contextualType, true);
+                    switch (functionFlags & 3 /* AsyncGenerator */) {
+                        case 3 /* AsyncGenerator */:
+                            contextualType = getIteratedTypeOfGenerator(contextualType, /*isAsyncGenerator*/ true);
                             break;
-                        case 1:
-                            contextualType = getIteratedTypeOfGenerator(contextualType, false);
+                        case 1 /* Generator */:
+                            contextualType = getIteratedTypeOfGenerator(contextualType, /*isAsyncGenerator*/ false);
                             break;
-                        case 2:
+                        case 2 /* Async */:
                             contextualType = getPromisedTypeOfPromise(contextualType);
                             break;
                     }
@@ -38204,12 +46920,15 @@ var ts;
                 type = getWidenedLiteralLikeTypeForContextualType(type, contextualType);
             }
             var widenedType = getWidenedType(type);
-            switch (functionFlags & 3) {
-                case 3:
+            switch (functionFlags & 3 /* AsyncGenerator */) {
+                case 3 /* AsyncGenerator */:
                     return createAsyncIterableIteratorType(widenedType);
-                case 1:
+                case 1 /* Generator */:
                     return createIterableIteratorType(widenedType);
-                case 2:
+                case 2 /* Async */:
+                    // From within an async function you can return either a non-promise value or a promise. Any
+                    // Promise/A+ compatible implementation will always assimilate any foreign promise, so the
+                    // return type of the body is awaited type of the body, wrapped in a native Promise<T> type.
                     return createPromiseType(widenedType);
                 default:
                     return widenedType;
@@ -38217,7 +46936,7 @@ var ts;
         }
         function checkAndAggregateYieldOperandTypes(func, checkMode) {
             var aggregatedTypes = [];
-            var isAsync = (ts.getFunctionFlags(func) & 2) !== 0;
+            var isAsync = (ts.getFunctionFlags(func) & 2 /* Async */) !== 0;
             ts.forEachYieldExpression(func.body, function (yieldExpression) {
                 ts.pushIfUnique(aggregatedTypes, getYieldedTypeOfYieldExpression(yieldExpression, isAsync, checkMode));
             });
@@ -38226,7 +46945,8 @@ var ts;
         function getYieldedTypeOfYieldExpression(node, isAsync, checkMode) {
             var errorNode = node.expression || node;
             var expressionType = node.expression ? checkExpressionCached(node.expression, checkMode) : undefinedWideningType;
-            var yieldedType = node.asteriskToken ? checkIteratedTypeOrElementType(expressionType, errorNode, false, isAsync) : expressionType;
+            // A `yield*` expression effectively yields everything that its operand yields
+            var yieldedType = node.asteriskToken ? checkIteratedTypeOrElementType(expressionType, errorNode, /*allowStringInput*/ false, isAsync) : expressionType;
             return !isAsync ? yieldedType : getAwaitedType(yieldedType, errorNode, node.asteriskToken
                 ? ts.Diagnostics.Type_of_iterated_elements_of_a_yield_Asterisk_operand_must_either_be_a_valid_promise_or_must_not_contain_a_callable_then_member
                 : ts.Diagnostics.Type_of_yield_operand_in_an_async_generator_must_either_be_a_valid_promise_or_must_not_contain_a_callable_then_member);
@@ -38246,14 +46966,15 @@ var ts;
             return eachTypeContainedIn(mapType(type, getRegularTypeOfLiteralType), switchTypes);
         }
         function functionHasImplicitReturn(func) {
-            if (!(func.flags & 128)) {
+            if (!(func.flags & 128 /* HasImplicitReturn */)) {
                 return false;
             }
-            if (ts.some(func.body.statements, function (statement) { return statement.kind === 227 && isExhaustiveSwitchStatement(statement); })) {
+            if (ts.some(func.body.statements, function (statement) { return statement.kind === 227 /* SwitchStatement */ && isExhaustiveSwitchStatement(statement); })) {
                 return false;
             }
             return true;
         }
+        /** NOTE: Return value of `[]` means a different thing than `undefined`. `[]` means func returns `void`, `undefined` means it returns `never`. */
         function checkAndAggregateReturnExpressionTypes(func, checkMode) {
             var functionFlags = ts.getFunctionFlags(func);
             var aggregatedTypes = [];
@@ -38263,10 +46984,14 @@ var ts;
                 var expr = returnStatement.expression;
                 if (expr) {
                     var type = checkExpressionCached(expr, checkMode);
-                    if (functionFlags & 2) {
+                    if (functionFlags & 2 /* Async */) {
+                        // From within an async function you can return either a non-promise value or a promise. Any
+                        // Promise/A+ compatible implementation will always assimilate any foreign promise, so the
+                        // return type of the body should be unwrapped to its awaited type, which should be wrapped in
+                        // the native Promise<T> type by the caller.
                         type = checkAwaitedType(type, func, ts.Diagnostics.The_return_type_of_an_async_function_must_either_be_a_valid_promise_or_must_not_contain_a_callable_then_member);
                     }
-                    if (type.flags & 32768) {
+                    if (type.flags & 32768 /* Never */) {
                         hasReturnOfTypeNever = true;
                     }
                     ts.pushIfUnique(aggregatedTypes, type);
@@ -38280,36 +47005,52 @@ var ts;
             }
             if (strictNullChecks && aggregatedTypes.length && hasReturnWithNoExpression &&
                 !(isJavaScriptConstructor(func) && aggregatedTypes.some(function (t) { return t.symbol === func.symbol; }))) {
+                // Javascript "callable constructors", containing eg `if (!(this instanceof A)) return new A()` should not add undefined
                 ts.pushIfUnique(aggregatedTypes, undefinedType);
             }
             return aggregatedTypes;
         }
         function mayReturnNever(func) {
             switch (func.kind) {
-                case 192:
-                case 193:
+                case 192 /* FunctionExpression */:
+                case 193 /* ArrowFunction */:
                     return true;
-                case 154:
-                    return func.parent.kind === 184;
+                case 154 /* MethodDeclaration */:
+                    return func.parent.kind === 184 /* ObjectLiteralExpression */;
                 default:
                     return false;
             }
         }
+        /**
+         * TypeScript Specification 1.0 (6.3) - July 2014
+         *   An explicitly typed function whose return type isn't the Void type,
+         *   the Any type, or a union type containing the Void or Any type as a constituent
+         *   must have at least one return statement somewhere in its body.
+         *   An exception to this rule is if the function implementation consists of a single 'throw' statement.
+         *
+         * @param returnType - return type of the function, can be undefined if return type is not explicitly specified
+         */
         function checkAllCodePathsInNonVoidFunctionReturnOrThrow(func, returnType) {
             if (!produceDiagnostics) {
                 return;
             }
-            if (returnType && maybeTypeOfKind(returnType, 3 | 4096)) {
+            // Functions with with an explicitly specified 'void' or 'any' return type don't need any return expressions.
+            if (returnType && maybeTypeOfKind(returnType, 3 /* AnyOrUnknown */ | 4096 /* Void */)) {
                 return;
             }
-            if (func.kind === 153 || ts.nodeIsMissing(func.body) || func.body.kind !== 213 || !functionHasImplicitReturn(func)) {
+            // If all we have is a function signature, or an arrow function with an expression body, then there is nothing to check.
+            // also if HasImplicitReturn flag is not set this means that all codepaths in function body end with return or throw
+            if (func.kind === 153 /* MethodSignature */ || ts.nodeIsMissing(func.body) || func.body.kind !== 213 /* Block */ || !functionHasImplicitReturn(func)) {
                 return;
             }
-            var hasExplicitReturn = func.flags & 256;
-            if (returnType && returnType.flags & 32768) {
+            var hasExplicitReturn = func.flags & 256 /* HasExplicitReturn */;
+            if (returnType && returnType.flags & 32768 /* Never */) {
                 error(ts.getEffectiveReturnTypeNode(func), ts.Diagnostics.A_function_returning_never_cannot_have_a_reachable_end_point);
             }
             else if (returnType && !hasExplicitReturn) {
+                // minimal check: function has syntactic return type annotation and no explicit return statements in the body
+                // this function does not conform to the specification.
+                // NOTE: having returnType !== undefined is a precondition for entering this branch so func.type will always be present
                 error(ts.getEffectiveReturnTypeNode(func), ts.Diagnostics.A_function_whose_declared_type_is_neither_void_nor_any_must_return_a_value);
             }
             else if (returnType && strictNullChecks && !isTypeAssignableTo(undefinedType, returnType)) {
@@ -38317,6 +47058,9 @@ var ts;
             }
             else if (compilerOptions.noImplicitReturns) {
                 if (!returnType) {
+                    // If return type annotation is omitted check if function has any explicit return statements.
+                    // If it does not have any - its inferred return type is void - don't do any checks.
+                    // Otherwise get inferred return type from function body and report error only if it is not void / anytype
                     if (!hasExplicitReturn) {
                         return;
                     }
@@ -38329,12 +47073,14 @@ var ts;
             }
         }
         function checkFunctionExpressionOrObjectLiteralMethod(node, checkMode) {
-            ts.Debug.assert(node.kind !== 154 || ts.isObjectLiteralMethod(node));
-            if (checkMode === 1 && isContextSensitive(node)) {
+            ts.Debug.assert(node.kind !== 154 /* MethodDeclaration */ || ts.isObjectLiteralMethod(node));
+            // The identityMapper object is used to indicate that function expressions are wildcards
+            if (checkMode === 1 /* SkipContextSensitive */ && isContextSensitive(node)) {
                 return anyFunctionType;
             }
+            // Grammar checking
             var hasGrammarError = checkGrammarFunctionLikeDeclaration(node);
-            if (!hasGrammarError && node.kind === 192) {
+            if (!hasGrammarError && node.kind === 192 /* FunctionExpression */) {
                 checkGrammarForGenerator(node);
             }
             var links = getNodeLinks(node);
@@ -38342,15 +47088,19 @@ var ts;
             if (isTypeAny(type)) {
                 return type;
             }
-            if (!(links.flags & 1024)) {
+            // Check if function expression is contextually typed and assign parameter types if so.
+            if (!(links.flags & 1024 /* ContextChecked */)) {
                 var contextualSignature = getContextualSignature(node);
-                if (!(links.flags & 1024)) {
-                    links.flags |= 1024;
+                // If a type check is started at a function expression that is an argument of a function call, obtaining the
+                // contextual type may recursively get back to here during overload resolution of the call. If so, we will have
+                // already assigned contextual types.
+                if (!(links.flags & 1024 /* ContextChecked */)) {
+                    links.flags |= 1024 /* ContextChecked */;
                     if (contextualSignature) {
-                        var signature = getSignaturesOfType(type, 0)[0];
+                        var signature = getSignaturesOfType(type, 0 /* Call */)[0];
                         if (isContextSensitive(node)) {
                             var contextualMapper = getContextualMapper(node);
-                            if (checkMode === 2) {
+                            if (checkMode === 2 /* Inferential */) {
                                 inferFromAnnotatedParameters(signature, contextualSignature, contextualMapper);
                             }
                             var instantiatedContextualSignature = contextualMapper === identityMapper ?
@@ -38371,31 +47121,42 @@ var ts;
             return type;
         }
         function checkFunctionExpressionOrObjectLiteralMethodDeferred(node) {
-            ts.Debug.assert(node.kind !== 154 || ts.isObjectLiteralMethod(node));
+            ts.Debug.assert(node.kind !== 154 /* MethodDeclaration */ || ts.isObjectLiteralMethod(node));
             var functionFlags = ts.getFunctionFlags(node);
             var returnTypeNode = ts.getEffectiveReturnTypeNode(node);
             var returnOrPromisedType = returnTypeNode &&
-                ((functionFlags & 3) === 2 ?
-                    checkAsyncFunctionReturnType(node) :
-                    getTypeFromTypeNode(returnTypeNode));
-            if ((functionFlags & 1) === 0) {
+                ((functionFlags & 3 /* AsyncGenerator */) === 2 /* Async */ ?
+                    checkAsyncFunctionReturnType(node) : // Async function
+                    getTypeFromTypeNode(returnTypeNode)); // AsyncGenerator function, Generator function, or normal function
+            if ((functionFlags & 1 /* Generator */) === 0) { // Async function or normal function
+                // return is not necessary in the body of generators
                 checkAllCodePathsInNonVoidFunctionReturnOrThrow(node, returnOrPromisedType);
             }
             if (node.body) {
                 if (!returnTypeNode) {
+                    // There are some checks that are only performed in getReturnTypeFromBody, that may produce errors
+                    // we need. An example is the noImplicitAny errors resulting from widening the return expression
+                    // of a function. Because checking of function expression bodies is deferred, there was never an
+                    // appropriate time to do this during the main walk of the file (see the comment at the top of
+                    // checkFunctionExpressionBodies). So it must be done now.
                     getReturnTypeOfSignature(getSignatureFromDeclaration(node));
                 }
-                if (node.body.kind === 213) {
+                if (node.body.kind === 213 /* Block */) {
                     checkSourceElement(node.body);
                 }
                 else {
+                    // From within an async function you can return either a non-promise value or a promise. Any
+                    // Promise/A+ compatible implementation will always assimilate any foreign promise, so we
+                    // should not be checking assignability of a promise to the return type. Instead, we need to
+                    // check assignability of the awaited type of the expression body against the promised type of
+                    // its return type annotation.
                     var exprType = checkExpression(node.body);
                     if (returnOrPromisedType) {
-                        if ((functionFlags & 3) === 2) {
+                        if ((functionFlags & 3 /* AsyncGenerator */) === 2 /* Async */) { // Async function
                             var awaitedType = checkAwaitedType(exprType, node.body, ts.Diagnostics.The_return_type_of_an_async_function_must_either_be_a_valid_promise_or_must_not_contain_a_callable_then_member);
                             checkTypeAssignableTo(awaitedType, returnOrPromisedType, node.body);
                         }
-                        else {
+                        else { // Normal function
                             checkTypeAssignableTo(exprType, returnOrPromisedType, node.body);
                         }
                     }
@@ -38403,28 +47164,39 @@ var ts;
             }
         }
         function checkArithmeticOperandType(operand, type, diagnostic) {
-            if (!isTypeAssignableToKind(type, 168)) {
+            if (!isTypeAssignableToKind(type, 168 /* NumberLike */)) {
                 error(operand, diagnostic);
                 return false;
             }
             return true;
         }
         function isReadonlySymbol(symbol) {
-            return !!(ts.getCheckFlags(symbol) & 8 ||
-                symbol.flags & 4 && ts.getDeclarationModifierFlagsFromSymbol(symbol) & 64 ||
-                symbol.flags & 3 && getDeclarationNodeFlagsFromSymbol(symbol) & 2 ||
-                symbol.flags & 98304 && !(symbol.flags & 65536) ||
-                symbol.flags & 8);
+            // The following symbols are considered read-only:
+            // Properties with a 'readonly' modifier
+            // Variables declared with 'const'
+            // Get accessors without matching set accessors
+            // Enum members
+            // Unions and intersections of the above (unions and intersections eagerly set isReadonly on creation)
+            return !!(ts.getCheckFlags(symbol) & 8 /* Readonly */ ||
+                symbol.flags & 4 /* Property */ && ts.getDeclarationModifierFlagsFromSymbol(symbol) & 64 /* Readonly */ ||
+                symbol.flags & 3 /* Variable */ && getDeclarationNodeFlagsFromSymbol(symbol) & 2 /* Const */ ||
+                symbol.flags & 98304 /* Accessor */ && !(symbol.flags & 65536 /* SetAccessor */) ||
+                symbol.flags & 8 /* EnumMember */);
         }
         function isReferenceToReadonlyEntity(expr, symbol) {
             if (isReadonlySymbol(symbol)) {
-                if (symbol.flags & 4 &&
-                    (expr.kind === 185 || expr.kind === 186) &&
-                    expr.expression.kind === 99) {
+                // Allow assignments to readonly properties within constructors of the same class declaration.
+                if (symbol.flags & 4 /* Property */ &&
+                    (expr.kind === 185 /* PropertyAccessExpression */ || expr.kind === 186 /* ElementAccessExpression */) &&
+                    expr.expression.kind === 99 /* ThisKeyword */) {
+                    // Look for if this is the constructor for the class that `symbol` is a property of.
                     var func = ts.getContainingFunction(expr);
-                    if (!(func && func.kind === 155)) {
+                    if (!(func && func.kind === 155 /* Constructor */)) {
                         return true;
                     }
+                    // If func.parent is a class and symbol is a (readonly) property of that class, or
+                    // if func is a constructor and symbol is a (readonly) parameter property declared in it,
+                    // then symbol is writeable here.
                     return !(func.parent === symbol.valueDeclaration.parent || func === symbol.valueDeclaration.parent);
                 }
                 return true;
@@ -38432,21 +47204,22 @@ var ts;
             return false;
         }
         function isReferenceThroughNamespaceImport(expr) {
-            if (expr.kind === 185 || expr.kind === 186) {
+            if (expr.kind === 185 /* PropertyAccessExpression */ || expr.kind === 186 /* ElementAccessExpression */) {
                 var node = ts.skipParentheses(expr.expression);
-                if (node.kind === 71) {
+                if (node.kind === 71 /* Identifier */) {
                     var symbol = getNodeLinks(node).resolvedSymbol;
-                    if (symbol.flags & 2097152) {
+                    if (symbol.flags & 2097152 /* Alias */) {
                         var declaration = getDeclarationOfAliasSymbol(symbol);
-                        return !!declaration && declaration.kind === 246;
+                        return !!declaration && declaration.kind === 246 /* NamespaceImport */;
                     }
                 }
             }
             return false;
         }
         function checkReferenceExpression(expr, invalidReferenceMessage) {
-            var node = ts.skipOuterExpressions(expr, 2 | 1);
-            if (node.kind !== 71 && node.kind !== 185 && node.kind !== 186) {
+            // References are combinations of identifiers, parentheses, and property accesses.
+            var node = ts.skipOuterExpressions(expr, 2 /* Assertions */ | 1 /* Parentheses */);
+            if (node.kind !== 71 /* Identifier */ && node.kind !== 185 /* PropertyAccessExpression */ && node.kind !== 186 /* ElementAccessExpression */) {
                 error(expr, invalidReferenceMessage);
                 return false;
             }
@@ -38455,7 +47228,7 @@ var ts;
         function checkDeleteExpression(node) {
             checkExpression(node.expression);
             var expr = ts.skipParentheses(node.expression);
-            if (expr.kind !== 185 && expr.kind !== 186) {
+            if (expr.kind !== 185 /* PropertyAccessExpression */ && expr.kind !== 186 /* ElementAccessExpression */) {
                 error(expr, ts.Diagnostics.The_operand_of_a_delete_operator_must_be_a_property_reference);
                 return booleanType;
             }
@@ -38475,8 +47248,9 @@ var ts;
             return undefinedWideningType;
         }
         function checkAwaitExpression(node) {
+            // Grammar checking
             if (produceDiagnostics) {
-                if (!(node.flags & 16384)) {
+                if (!(node.flags & 16384 /* AwaitContext */)) {
                     grammarErrorOnFirstToken(node, ts.Diagnostics.await_expression_is_only_allowed_within_an_async_function);
                 }
                 if (isInParameterInitializerBeforeContainingFunction(node)) {
@@ -38491,32 +47265,33 @@ var ts;
             if (operandType === silentNeverType) {
                 return silentNeverType;
             }
-            if (node.operand.kind === 8) {
-                if (node.operator === 38) {
+            if (node.operand.kind === 8 /* NumericLiteral */) {
+                if (node.operator === 38 /* MinusToken */) {
                     return getFreshTypeOfLiteralType(getLiteralType(-node.operand.text));
                 }
-                else if (node.operator === 37) {
+                else if (node.operator === 37 /* PlusToken */) {
                     return getFreshTypeOfLiteralType(getLiteralType(+node.operand.text));
                 }
             }
             switch (node.operator) {
-                case 37:
-                case 38:
-                case 52:
+                case 37 /* PlusToken */:
+                case 38 /* MinusToken */:
+                case 52 /* TildeToken */:
                     checkNonNullType(operandType, node.operand);
-                    if (maybeTypeOfKind(operandType, 3072)) {
+                    if (maybeTypeOfKind(operandType, 3072 /* ESSymbolLike */)) {
                         error(node.operand, ts.Diagnostics.The_0_operator_cannot_be_applied_to_type_symbol, ts.tokenToString(node.operator));
                     }
                     return numberType;
-                case 51:
-                    var facts = getTypeFacts(operandType) & (1048576 | 2097152);
-                    return facts === 1048576 ? falseType :
-                        facts === 2097152 ? trueType :
+                case 51 /* ExclamationToken */:
+                    var facts = getTypeFacts(operandType) & (1048576 /* Truthy */ | 2097152 /* Falsy */);
+                    return facts === 1048576 /* Truthy */ ? falseType :
+                        facts === 2097152 /* Falsy */ ? trueType :
                             booleanType;
-                case 43:
-                case 44:
+                case 43 /* PlusPlusToken */:
+                case 44 /* MinusMinusToken */:
                     var ok = checkArithmeticOperandType(node.operand, checkNonNullType(operandType, node.operand), ts.Diagnostics.An_arithmetic_operand_must_be_of_type_any_number_or_an_enum_type);
                     if (ok) {
+                        // run check only if former checks succeeded to avoid reporting cascading errors
                         checkReferenceExpression(node.operand, ts.Diagnostics.The_operand_of_an_increment_or_decrement_operator_must_be_a_variable_or_a_property_access);
                     }
                     return numberType;
@@ -38530,15 +47305,18 @@ var ts;
             }
             var ok = checkArithmeticOperandType(node.operand, checkNonNullType(operandType, node.operand), ts.Diagnostics.An_arithmetic_operand_must_be_of_type_any_number_or_an_enum_type);
             if (ok) {
+                // run check only if former checks succeeded to avoid reporting cascading errors
                 checkReferenceExpression(node.operand, ts.Diagnostics.The_operand_of_an_increment_or_decrement_operator_must_be_a_variable_or_a_property_access);
             }
             return numberType;
         }
+        // Return true if type might be of the given kind. A union or intersection type might be of a given
+        // kind if at least one constituent type is of the given kind.
         function maybeTypeOfKind(type, kind) {
-            if (type.flags & kind & ~134217728 || kind & 134217728 && isGenericMappedType(type)) {
+            if (type.flags & kind & ~134217728 /* GenericMappedType */ || kind & 134217728 /* GenericMappedType */ && isGenericMappedType(type)) {
                 return true;
             }
-            if (type.flags & 786432) {
+            if (type.flags & 786432 /* UnionOrIntersection */) {
                 var types = type.types;
                 for (var _i = 0, types_16 = types; _i < types_16.length; _i++) {
                     var t = types_16[_i];
@@ -38553,38 +47331,44 @@ var ts;
             if (source.flags & kind) {
                 return true;
             }
-            if (strict && source.flags & (3 | 4096 | 8192 | 16384)) {
+            if (strict && source.flags & (3 /* AnyOrUnknown */ | 4096 /* Void */ | 8192 /* Undefined */ | 16384 /* Null */)) {
                 return false;
             }
-            return !!(kind & 168) && isTypeAssignableTo(source, numberType) ||
-                !!(kind & 68) && isTypeAssignableTo(source, stringType) ||
-                !!(kind & 272) && isTypeAssignableTo(source, booleanType) ||
-                !!(kind & 4096) && isTypeAssignableTo(source, voidType) ||
-                !!(kind & 32768) && isTypeAssignableTo(source, neverType) ||
-                !!(kind & 16384) && isTypeAssignableTo(source, nullType) ||
-                !!(kind & 8192) && isTypeAssignableTo(source, undefinedType) ||
-                !!(kind & 1024) && isTypeAssignableTo(source, esSymbolType) ||
-                !!(kind & 16777216) && isTypeAssignableTo(source, nonPrimitiveType);
+            return !!(kind & 168 /* NumberLike */) && isTypeAssignableTo(source, numberType) ||
+                !!(kind & 68 /* StringLike */) && isTypeAssignableTo(source, stringType) ||
+                !!(kind & 272 /* BooleanLike */) && isTypeAssignableTo(source, booleanType) ||
+                !!(kind & 4096 /* Void */) && isTypeAssignableTo(source, voidType) ||
+                !!(kind & 32768 /* Never */) && isTypeAssignableTo(source, neverType) ||
+                !!(kind & 16384 /* Null */) && isTypeAssignableTo(source, nullType) ||
+                !!(kind & 8192 /* Undefined */) && isTypeAssignableTo(source, undefinedType) ||
+                !!(kind & 1024 /* ESSymbol */) && isTypeAssignableTo(source, esSymbolType) ||
+                !!(kind & 16777216 /* NonPrimitive */) && isTypeAssignableTo(source, nonPrimitiveType);
         }
         function allTypesAssignableToKind(source, kind, strict) {
-            return source.flags & 262144 ?
+            return source.flags & 262144 /* Union */ ?
                 ts.every(source.types, function (subType) { return allTypesAssignableToKind(subType, kind, strict); }) :
                 isTypeAssignableToKind(source, kind, strict);
         }
         function isConstEnumObjectType(type) {
-            return !!(ts.getObjectFlags(type) & 16) && !!type.symbol && isConstEnumSymbol(type.symbol);
+            return !!(ts.getObjectFlags(type) & 16 /* Anonymous */) && !!type.symbol && isConstEnumSymbol(type.symbol);
         }
         function isConstEnumSymbol(symbol) {
-            return (symbol.flags & 128) !== 0;
+            return (symbol.flags & 128 /* ConstEnum */) !== 0;
         }
         function checkInstanceOfExpression(left, right, leftType, rightType) {
             if (leftType === silentNeverType || rightType === silentNeverType) {
                 return silentNeverType;
             }
+            // TypeScript 1.0 spec (April 2014): 4.15.4
+            // The instanceof operator requires the left operand to be of type Any, an object type, or a type parameter type,
+            // and the right operand to be of type Any, a subtype of the 'Function' interface type, or have a call or construct signature.
+            // The result is always of the Boolean primitive type.
+            // NOTE: do not raise error if leftType is unknown as related error was already reported
             if (!isTypeAny(leftType) &&
-                allTypesAssignableToKind(leftType, 32764)) {
+                allTypesAssignableToKind(leftType, 32764 /* Primitive */)) {
                 error(left, ts.Diagnostics.The_left_hand_side_of_an_instanceof_expression_must_be_of_type_any_an_object_type_or_a_type_parameter);
             }
+            // NOTE: do not raise error if right is unknown as related error was already reported
             if (!(isTypeAny(rightType) || typeHasCallOrConstructSignatures(rightType) || isTypeSubtypeOf(rightType, globalFunctionType))) {
                 error(right, ts.Diagnostics.The_right_hand_side_of_an_instanceof_expression_must_be_of_type_any_or_of_a_type_assignable_to_the_Function_interface_type);
             }
@@ -38596,17 +47380,20 @@ var ts;
             }
             leftType = checkNonNullType(leftType, left);
             rightType = checkNonNullType(rightType, right);
-            if (!(isTypeComparableTo(leftType, stringType) || isTypeAssignableToKind(leftType, 168 | 3072))) {
+            // TypeScript 1.0 spec (April 2014): 4.15.5
+            // The in operator requires the left operand to be of type Any, the String primitive type, or the Number primitive type,
+            // and the right operand to be of type Any, an object type, or a type parameter type.
+            // The result is always of the Boolean primitive type.
+            if (!(isTypeComparableTo(leftType, stringType) || isTypeAssignableToKind(leftType, 168 /* NumberLike */ | 3072 /* ESSymbolLike */))) {
                 error(left, ts.Diagnostics.The_left_hand_side_of_an_in_expression_must_be_of_type_any_string_number_or_symbol);
             }
-            if (!isTypeAssignableToKind(rightType, 16777216 | 14745600)) {
+            if (!isTypeAssignableToKind(rightType, 16777216 /* NonPrimitive */ | 14745600 /* InstantiableNonPrimitive */)) {
                 error(right, ts.Diagnostics.The_right_hand_side_of_an_in_expression_must_be_of_type_any_an_object_type_or_a_type_parameter);
             }
             return booleanType;
         }
         function checkObjectLiteralAssignment(node, sourceType) {
             var properties = node.properties;
-            checkGrammarForDisallowedTrailingComma(properties, ts.Diagnostics.A_rest_parameter_or_binding_pattern_may_not_have_a_trailing_comma);
             if (strictNullChecks && properties.length === 0) {
                 return checkNonNullType(sourceType, node);
             }
@@ -38616,10 +47403,11 @@ var ts;
             }
             return sourceType;
         }
+        /** Note: If property cannot be a SpreadAssignment, then allProperties does not need to be provided */
         function checkObjectLiteralDestructuringPropertyAssignment(objectLiteralType, property, allProperties) {
-            if (property.kind === 270 || property.kind === 271) {
+            if (property.kind === 270 /* PropertyAssignment */ || property.kind === 271 /* ShorthandPropertyAssignment */) {
                 var name = property.name;
-                if (name.kind === 147) {
+                if (name.kind === 147 /* ComputedPropertyName */) {
                     checkComputedPropertyName(name);
                 }
                 if (isComputedNonLiteralName(name)) {
@@ -38629,13 +47417,14 @@ var ts;
                 var type = isTypeAny(objectLiteralType)
                     ? objectLiteralType
                     : getTypeOfPropertyOfType(objectLiteralType, text) ||
-                        isNumericLiteralName(text) && getIndexTypeOfType(objectLiteralType, 1) ||
-                        getIndexTypeOfType(objectLiteralType, 0);
+                        isNumericLiteralName(text) && getIndexTypeOfType(objectLiteralType, 1 /* Number */) ||
+                        getIndexTypeOfType(objectLiteralType, 0 /* String */);
                 if (type) {
-                    if (property.kind === 271) {
+                    if (property.kind === 271 /* ShorthandPropertyAssignment */) {
                         return checkDestructuringAssignment(property, type);
                     }
                     else {
+                        // non-shorthand property assignments should always have initializers
                         return checkDestructuringAssignment(property.initializer, type);
                     }
                 }
@@ -38643,9 +47432,9 @@ var ts;
                     error(name, ts.Diagnostics.Type_0_has_no_property_1_and_no_string_index_signature, typeToString(objectLiteralType), ts.declarationNameToString(name));
                 }
             }
-            else if (property.kind === 272) {
-                if (languageVersion < 6) {
-                    checkExternalEmitHelpers(property, 4);
+            else if (property.kind === 272 /* SpreadAssignment */) {
+                if (languageVersion < 6 /* ESNext */) {
+                    checkExternalEmitHelpers(property, 4 /* Rest */);
                 }
                 var nonRestNames = [];
                 if (allProperties) {
@@ -38654,6 +47443,7 @@ var ts;
                     }
                 }
                 var type = getRestType(objectLiteralType, nonRestNames, objectLiteralType.symbol);
+                checkGrammarForDisallowedTrailingComma(allProperties, ts.Diagnostics.A_rest_parameter_or_binding_pattern_may_not_have_a_trailing_comma);
                 return checkDestructuringAssignment(property.expression, type);
             }
             else {
@@ -38662,11 +47452,13 @@ var ts;
         }
         function checkArrayLiteralAssignment(node, sourceType, checkMode) {
             var elements = node.elements;
-            checkGrammarForDisallowedTrailingComma(elements, ts.Diagnostics.A_rest_parameter_or_binding_pattern_may_not_have_a_trailing_comma);
-            if (languageVersion < 2 && compilerOptions.downlevelIteration) {
-                checkExternalEmitHelpers(node, 512);
+            if (languageVersion < 2 /* ES2015 */ && compilerOptions.downlevelIteration) {
+                checkExternalEmitHelpers(node, 512 /* Read */);
             }
-            var elementType = checkIteratedTypeOrElementType(sourceType, node, false, false) || errorType;
+            // This elementType will be used if the specific property corresponding to this index is not
+            // present (aka the tuple element property). This call also checks that the parentType is in
+            // fact an iterable or array (depending on target language).
+            var elementType = checkIteratedTypeOrElementType(sourceType, node, /*allowStringInput*/ false, /*allowAsyncIterables*/ false) || errorType;
             for (var i = 0; i < elements.length; i++) {
                 checkArrayLiteralDestructuringElementAssignment(node, sourceType, i, elementType, checkMode);
             }
@@ -38675,8 +47467,8 @@ var ts;
         function checkArrayLiteralDestructuringElementAssignment(node, sourceType, elementIndex, elementType, checkMode) {
             var elements = node.elements;
             var element = elements[elementIndex];
-            if (element.kind !== 206) {
-                if (element.kind !== 204) {
+            if (element.kind !== 206 /* OmittedExpression */) {
+                if (element.kind !== 204 /* SpreadElement */) {
                     var propName = "" + elementIndex;
                     var type = isTypeAny(sourceType)
                         ? sourceType
@@ -38687,6 +47479,8 @@ var ts;
                         return checkDestructuringAssignment(element, type, checkMode);
                     }
                     else {
+                        // We still need to check element expression here because we may need to set appropriate flag on the expression
+                        // such as NodeCheckFlags.LexicalThis on "this"expression.
                         checkExpression(element);
                         if (isTupleType(sourceType)) {
                             error(element, ts.Diagnostics.Tuple_type_0_with_length_1_cannot_be_assigned_to_tuple_with_length_2, typeToString(sourceType), getTypeReferenceArity(sourceType), elements.length);
@@ -38702,10 +47496,11 @@ var ts;
                     }
                     else {
                         var restExpression = element.expression;
-                        if (restExpression.kind === 200 && restExpression.operatorToken.kind === 58) {
+                        if (restExpression.kind === 200 /* BinaryExpression */ && restExpression.operatorToken.kind === 58 /* EqualsToken */) {
                             error(restExpression.operatorToken, ts.Diagnostics.A_rest_element_cannot_have_an_initializer);
                         }
                         else {
+                            checkGrammarForDisallowedTrailingComma(node.elements, ts.Diagnostics.A_rest_parameter_or_binding_pattern_may_not_have_a_trailing_comma);
                             return checkDestructuringAssignment(restExpression, createArrayType(elementType), checkMode);
                         }
                     }
@@ -38715,12 +47510,14 @@ var ts;
         }
         function checkDestructuringAssignment(exprOrAssignment, sourceType, checkMode) {
             var target;
-            if (exprOrAssignment.kind === 271) {
+            if (exprOrAssignment.kind === 271 /* ShorthandPropertyAssignment */) {
                 var prop = exprOrAssignment;
                 if (prop.objectAssignmentInitializer) {
+                    // In strict null checking mode, if a default value of a non-undefined type is specified, remove
+                    // undefined from the final type.
                     if (strictNullChecks &&
-                        !(getFalsyFlags(checkExpression(prop.objectAssignmentInitializer)) & 8192)) {
-                        sourceType = getTypeWithFacts(sourceType, 131072);
+                        !(getFalsyFlags(checkExpression(prop.objectAssignmentInitializer)) & 8192 /* Undefined */)) {
+                        sourceType = getTypeWithFacts(sourceType, 131072 /* NEUndefined */);
                     }
                     checkBinaryLikeExpression(prop.name, prop.equalsToken, prop.objectAssignmentInitializer, checkMode);
                 }
@@ -38729,80 +47526,91 @@ var ts;
             else {
                 target = exprOrAssignment;
             }
-            if (target.kind === 200 && target.operatorToken.kind === 58) {
+            if (target.kind === 200 /* BinaryExpression */ && target.operatorToken.kind === 58 /* EqualsToken */) {
                 checkBinaryExpression(target, checkMode);
                 target = target.left;
             }
-            if (target.kind === 184) {
+            if (target.kind === 184 /* ObjectLiteralExpression */) {
                 return checkObjectLiteralAssignment(target, sourceType);
             }
-            if (target.kind === 183) {
+            if (target.kind === 183 /* ArrayLiteralExpression */) {
                 return checkArrayLiteralAssignment(target, sourceType, checkMode);
             }
             return checkReferenceAssignment(target, sourceType, checkMode);
         }
         function checkReferenceAssignment(target, sourceType, checkMode) {
             var targetType = checkExpression(target, checkMode);
-            var error = target.parent.kind === 272 ?
+            var error = target.parent.kind === 272 /* SpreadAssignment */ ?
                 ts.Diagnostics.The_target_of_an_object_rest_assignment_must_be_a_variable_or_a_property_access :
                 ts.Diagnostics.The_left_hand_side_of_an_assignment_expression_must_be_a_variable_or_a_property_access;
             if (checkReferenceExpression(target, error)) {
-                checkTypeAssignableTo(sourceType, targetType, target, undefined);
+                checkTypeAssignableTo(sourceType, targetType, target, /*headMessage*/ undefined);
             }
             return sourceType;
         }
+        /**
+         * This is a *shallow* check: An expression is side-effect-free if the
+         * evaluation of the expression *itself* cannot produce side effects.
+         * For example, x++ / 3 is side-effect free because the / operator
+         * does not have side effects.
+         * The intent is to "smell test" an expression for correctness in positions where
+         * its value is discarded (e.g. the left side of the comma operator).
+         */
         function isSideEffectFree(node) {
             node = ts.skipParentheses(node);
             switch (node.kind) {
-                case 71:
-                case 9:
-                case 12:
-                case 189:
-                case 202:
-                case 13:
-                case 8:
-                case 101:
-                case 86:
-                case 95:
-                case 140:
-                case 192:
-                case 205:
-                case 193:
-                case 183:
-                case 184:
-                case 195:
-                case 209:
-                case 256:
-                case 255:
+                case 71 /* Identifier */:
+                case 9 /* StringLiteral */:
+                case 12 /* RegularExpressionLiteral */:
+                case 189 /* TaggedTemplateExpression */:
+                case 202 /* TemplateExpression */:
+                case 13 /* NoSubstitutionTemplateLiteral */:
+                case 8 /* NumericLiteral */:
+                case 101 /* TrueKeyword */:
+                case 86 /* FalseKeyword */:
+                case 95 /* NullKeyword */:
+                case 140 /* UndefinedKeyword */:
+                case 192 /* FunctionExpression */:
+                case 205 /* ClassExpression */:
+                case 193 /* ArrowFunction */:
+                case 183 /* ArrayLiteralExpression */:
+                case 184 /* ObjectLiteralExpression */:
+                case 195 /* TypeOfExpression */:
+                case 209 /* NonNullExpression */:
+                case 256 /* JsxSelfClosingElement */:
+                case 255 /* JsxElement */:
                     return true;
-                case 201:
+                case 201 /* ConditionalExpression */:
                     return isSideEffectFree(node.whenTrue) &&
                         isSideEffectFree(node.whenFalse);
-                case 200:
+                case 200 /* BinaryExpression */:
                     if (ts.isAssignmentOperator(node.operatorToken.kind)) {
                         return false;
                     }
                     return isSideEffectFree(node.left) &&
                         isSideEffectFree(node.right);
-                case 198:
-                case 199:
+                case 198 /* PrefixUnaryExpression */:
+                case 199 /* PostfixUnaryExpression */:
+                    // Unary operators ~, !, +, and - have no side effects.
+                    // The rest do.
                     switch (node.operator) {
-                        case 51:
-                        case 37:
-                        case 38:
-                        case 52:
+                        case 51 /* ExclamationToken */:
+                        case 37 /* PlusToken */:
+                        case 38 /* MinusToken */:
+                        case 52 /* TildeToken */:
                             return true;
                     }
                     return false;
-                case 196:
-                case 190:
-                case 208:
+                // Some forms listed here for clarity
+                case 196 /* VoidExpression */: // Explicit opt-out
+                case 190 /* TypeAssertionExpression */: // Not SEF, but can produce useful type warnings
+                case 208 /* AsExpression */: // Not SEF, but can produce useful type warnings
                 default:
                     return false;
             }
         }
         function isTypeEqualityComparableTo(source, target) {
-            return (target.flags & 24576) !== 0 || isTypeComparableTo(source, target);
+            return (target.flags & 24576 /* Nullable */) !== 0 || isTypeComparableTo(source, target);
         }
         function checkBinaryExpression(node, checkMode) {
             if (ts.isInJavaScriptFile(node) && ts.getAssignedJavascriptInitializer(node)) {
@@ -38812,46 +47620,49 @@ var ts;
         }
         function checkBinaryLikeExpression(left, operatorToken, right, checkMode, errorNode) {
             var operator = operatorToken.kind;
-            if (operator === 58 && (left.kind === 184 || left.kind === 183)) {
+            if (operator === 58 /* EqualsToken */ && (left.kind === 184 /* ObjectLiteralExpression */ || left.kind === 183 /* ArrayLiteralExpression */)) {
                 return checkDestructuringAssignment(left, checkExpression(right, checkMode), checkMode);
             }
             var leftType = checkExpression(left, checkMode);
             var rightType = checkExpression(right, checkMode);
             switch (operator) {
-                case 39:
-                case 40:
-                case 61:
-                case 62:
-                case 41:
-                case 63:
-                case 42:
-                case 64:
-                case 38:
-                case 60:
-                case 45:
-                case 65:
-                case 46:
-                case 66:
-                case 47:
-                case 67:
-                case 49:
-                case 69:
-                case 50:
-                case 70:
-                case 48:
-                case 68:
+                case 39 /* AsteriskToken */:
+                case 40 /* AsteriskAsteriskToken */:
+                case 61 /* AsteriskEqualsToken */:
+                case 62 /* AsteriskAsteriskEqualsToken */:
+                case 41 /* SlashToken */:
+                case 63 /* SlashEqualsToken */:
+                case 42 /* PercentToken */:
+                case 64 /* PercentEqualsToken */:
+                case 38 /* MinusToken */:
+                case 60 /* MinusEqualsToken */:
+                case 45 /* LessThanLessThanToken */:
+                case 65 /* LessThanLessThanEqualsToken */:
+                case 46 /* GreaterThanGreaterThanToken */:
+                case 66 /* GreaterThanGreaterThanEqualsToken */:
+                case 47 /* GreaterThanGreaterThanGreaterThanToken */:
+                case 67 /* GreaterThanGreaterThanGreaterThanEqualsToken */:
+                case 49 /* BarToken */:
+                case 69 /* BarEqualsToken */:
+                case 50 /* CaretToken */:
+                case 70 /* CaretEqualsToken */:
+                case 48 /* AmpersandToken */:
+                case 68 /* AmpersandEqualsToken */:
                     if (leftType === silentNeverType || rightType === silentNeverType) {
                         return silentNeverType;
                     }
                     leftType = checkNonNullType(leftType, left);
                     rightType = checkNonNullType(rightType, right);
                     var suggestedOperator = void 0;
-                    if ((leftType.flags & 272) &&
-                        (rightType.flags & 272) &&
+                    // if a user tries to apply a bitwise operator to 2 boolean operands
+                    // try and return them a helpful suggestion
+                    if ((leftType.flags & 272 /* BooleanLike */) &&
+                        (rightType.flags & 272 /* BooleanLike */) &&
                         (suggestedOperator = getSuggestedBooleanOperator(operatorToken.kind)) !== undefined) {
                         error(errorNode || operatorToken, ts.Diagnostics.The_0_operator_is_not_allowed_for_boolean_types_Consider_using_1_instead, ts.tokenToString(operatorToken.kind), ts.tokenToString(suggestedOperator));
                     }
                     else {
+                        // otherwise just check each operand separately and report errors as normal
                         var leftOk = checkArithmeticOperandType(left, leftType, ts.Diagnostics.The_left_hand_side_of_an_arithmetic_operation_must_be_of_type_any_number_or_an_enum_type);
                         var rightOk = checkArithmeticOperandType(right, rightType, ts.Diagnostics.The_right_hand_side_of_an_arithmetic_operation_must_be_of_type_any_number_or_an_enum_type);
                         if (leftOk && rightOk) {
@@ -38859,25 +47670,31 @@ var ts;
                         }
                     }
                     return numberType;
-                case 37:
-                case 59:
+                case 37 /* PlusToken */:
+                case 59 /* PlusEqualsToken */:
                     if (leftType === silentNeverType || rightType === silentNeverType) {
                         return silentNeverType;
                     }
-                    if (!isTypeAssignableToKind(leftType, 68) && !isTypeAssignableToKind(rightType, 68)) {
+                    if (!isTypeAssignableToKind(leftType, 68 /* StringLike */) && !isTypeAssignableToKind(rightType, 68 /* StringLike */)) {
                         leftType = checkNonNullType(leftType, left);
                         rightType = checkNonNullType(rightType, right);
                     }
                     var resultType = void 0;
-                    if (isTypeAssignableToKind(leftType, 168, true) && isTypeAssignableToKind(rightType, 168, true)) {
+                    if (isTypeAssignableToKind(leftType, 168 /* NumberLike */, /*strict*/ true) && isTypeAssignableToKind(rightType, 168 /* NumberLike */, /*strict*/ true)) {
+                        // Operands of an enum type are treated as having the primitive type Number.
+                        // If both operands are of the Number primitive type, the result is of the Number primitive type.
                         resultType = numberType;
                     }
-                    else if (isTypeAssignableToKind(leftType, 68, true) || isTypeAssignableToKind(rightType, 68, true)) {
+                    else if (isTypeAssignableToKind(leftType, 68 /* StringLike */, /*strict*/ true) || isTypeAssignableToKind(rightType, 68 /* StringLike */, /*strict*/ true)) {
+                        // If one or both operands are of the String primitive type, the result is of the String primitive type.
                         resultType = stringType;
                     }
                     else if (isTypeAny(leftType) || isTypeAny(rightType)) {
+                        // Otherwise, the result is of type Any.
+                        // NOTE: unknown type here denotes error type. Old compiler treated this case as any type so do we.
                         resultType = leftType === errorType || rightType === errorType ? errorType : anyType;
                     }
+                    // Symbols are not allowed at all in arithmetic expressions
                     if (resultType && !checkForDisallowedESSymbolOperand(operator)) {
                         return resultType;
                     }
@@ -38885,14 +47702,14 @@ var ts;
                         reportOperatorError();
                         return anyType;
                     }
-                    if (operator === 59) {
+                    if (operator === 59 /* PlusEqualsToken */) {
                         checkAssignmentOperator(resultType);
                     }
                     return resultType;
-                case 27:
-                case 29:
-                case 30:
-                case 31:
+                case 27 /* LessThanToken */:
+                case 29 /* GreaterThanToken */:
+                case 30 /* LessThanEqualsToken */:
+                case 31 /* GreaterThanEqualsToken */:
                     if (checkForDisallowedESSymbolOperand(operator)) {
                         leftType = getBaseTypeOfLiteralType(checkNonNullType(leftType, left));
                         rightType = getBaseTypeOfLiteralType(checkNonNullType(rightType, right));
@@ -38901,10 +47718,10 @@ var ts;
                         }
                     }
                     return booleanType;
-                case 32:
-                case 33:
-                case 34:
-                case 35:
+                case 32 /* EqualsEqualsToken */:
+                case 33 /* ExclamationEqualsToken */:
+                case 34 /* EqualsEqualsEqualsToken */:
+                case 35 /* ExclamationEqualsEqualsToken */:
                     var leftIsLiteral = isLiteralType(leftType);
                     var rightIsLiteral = isLiteralType(rightType);
                     if (!leftIsLiteral || !rightIsLiteral) {
@@ -38915,23 +47732,23 @@ var ts;
                         reportOperatorError();
                     }
                     return booleanType;
-                case 93:
+                case 93 /* InstanceOfKeyword */:
                     return checkInstanceOfExpression(left, right, leftType, rightType);
-                case 92:
+                case 92 /* InKeyword */:
                     return checkInExpression(left, right, leftType, rightType);
-                case 53:
-                    return getTypeFacts(leftType) & 1048576 ?
+                case 53 /* AmpersandAmpersandToken */:
+                    return getTypeFacts(leftType) & 1048576 /* Truthy */ ?
                         getUnionType([extractDefinitelyFalsyTypes(strictNullChecks ? leftType : getBaseTypeOfLiteralType(rightType)), rightType]) :
                         leftType;
-                case 54:
-                    return getTypeFacts(leftType) & 2097152 ?
-                        getUnionType([removeDefinitelyFalsyTypes(leftType), rightType], 2) :
+                case 54 /* BarBarToken */:
+                    return getTypeFacts(leftType) & 2097152 /* Falsy */ ?
+                        getUnionType([removeDefinitelyFalsyTypes(leftType), rightType], 2 /* Subtype */) :
                         leftType;
-                case 58:
+                case 58 /* EqualsToken */:
                     checkSpecialAssignment(left, right);
                     checkAssignmentOperator(rightType);
                     return getRegularTypeOfObjectLiteral(rightType);
-                case 26:
+                case 26 /* CommaToken */:
                     if (!compilerOptions.allowUnreachableCode && isSideEffectFree(left) && !isEvalNode(right)) {
                         error(left, ts.Diagnostics.Left_side_of_comma_operator_is_unused_and_has_no_side_effects);
                     }
@@ -38941,15 +47758,15 @@ var ts;
             }
             function checkSpecialAssignment(left, right) {
                 var special = ts.getSpecialPropertyAssignmentKind(left.parent);
-                if (special === 2) {
+                if (special === 2 /* ModuleExports */) {
                     var rightType_1 = checkExpression(right, checkMode);
                     for (var _i = 0, _a = getPropertiesOfObjectType(rightType_1); _i < _a.length; _i++) {
                         var prop = _a[_i];
                         var propType = getTypeOfSymbol(prop);
-                        if (propType.symbol && propType.symbol.flags & 32) {
+                        if (propType.symbol && propType.symbol.flags & 32 /* Class */) {
                             var name = prop.escapedName;
-                            var symbol = resolveName(prop.valueDeclaration, name, 67901928, undefined, name, false);
-                            if (symbol && symbol.declarations.some(function (d) { return d.kind === 297; })) {
+                            var symbol = resolveName(prop.valueDeclaration, name, 67901928 /* Type */, undefined, name, /*isUse*/ false);
+                            if (symbol && symbol.declarations.some(ts.isJSDocTypedefTag)) {
                                 grammarErrorOnNode(symbol.declarations[0], ts.Diagnostics.Duplicate_identifier_0, ts.unescapeLeadingUnderscores(name));
                                 return grammarErrorOnNode(prop.valueDeclaration, ts.Diagnostics.Duplicate_identifier_0, ts.unescapeLeadingUnderscores(name));
                             }
@@ -38958,11 +47775,12 @@ var ts;
                 }
             }
             function isEvalNode(node) {
-                return node.kind === 71 && node.escapedText === "eval";
+                return node.kind === 71 /* Identifier */ && node.escapedText === "eval";
             }
+            // Return true if there was no error, false if there was an error.
             function checkForDisallowedESSymbolOperand(operator) {
-                var offendingSymbolOperand = maybeTypeOfKind(leftType, 3072) ? left :
-                    maybeTypeOfKind(rightType, 3072) ? right :
+                var offendingSymbolOperand = maybeTypeOfKind(leftType, 3072 /* ESSymbolLike */) ? left :
+                    maybeTypeOfKind(rightType, 3072 /* ESSymbolLike */) ? right :
                         undefined;
                 if (offendingSymbolOperand) {
                     error(offendingSymbolOperand, ts.Diagnostics.The_0_operator_cannot_be_applied_to_type_symbol, ts.tokenToString(operator));
@@ -38972,24 +47790,31 @@ var ts;
             }
             function getSuggestedBooleanOperator(operator) {
                 switch (operator) {
-                    case 49:
-                    case 69:
-                        return 54;
-                    case 50:
-                    case 70:
-                        return 35;
-                    case 48:
-                    case 68:
-                        return 53;
+                    case 49 /* BarToken */:
+                    case 69 /* BarEqualsToken */:
+                        return 54 /* BarBarToken */;
+                    case 50 /* CaretToken */:
+                    case 70 /* CaretEqualsToken */:
+                        return 35 /* ExclamationEqualsEqualsToken */;
+                    case 48 /* AmpersandToken */:
+                    case 68 /* AmpersandEqualsToken */:
+                        return 53 /* AmpersandAmpersandToken */;
                     default:
                         return undefined;
                 }
             }
             function checkAssignmentOperator(valueType) {
                 if (produceDiagnostics && ts.isAssignmentOperator(operator)) {
+                    // TypeScript 1.0 spec (April 2014): 4.17
+                    // An assignment of the form
+                    //    VarExpr = ValueExpr
+                    // requires VarExpr to be classified as a reference
+                    // A compound assignment furthermore requires VarExpr to be classified as a reference (section 4.1)
+                    // and the type of the non-compound operation to be assignable to the type of VarExpr.
                     if (checkReferenceExpression(left, ts.Diagnostics.The_left_hand_side_of_an_assignment_expression_must_be_a_variable_or_a_property_access)
                         && (!ts.isIdentifier(left) || ts.unescapeLeadingUnderscores(left.escapedText) !== "exports")) {
-                        checkTypeAssignableTo(valueType, leftType, left, undefined);
+                        // to avoid cascading errors check assignability only if 'isReference' check succeeded and no errors were reported
+                        checkTypeAssignableTo(valueType, leftType, left, /*headMessage*/ undefined);
                     }
                 }
             }
@@ -39013,8 +47838,9 @@ var ts;
             return false;
         }
         function checkYieldExpression(node) {
+            // Grammar checking
             if (produceDiagnostics) {
-                if (!(node.flags & 4096) || isYieldExpressionInClass(node)) {
+                if (!(node.flags & 4096 /* YieldContext */) || isYieldExpressionInClass(node)) {
                     grammarErrorOnFirstToken(node, ts.Diagnostics.A_yield_expression_is_only_allowed_in_a_generator_body);
                 }
                 if (isInParameterInitializerBeforeContainingFunction(node)) {
@@ -39025,45 +47851,58 @@ var ts;
             if (!func)
                 return anyType;
             var functionFlags = ts.getFunctionFlags(func);
-            if (!(functionFlags & 1)) {
+            if (!(functionFlags & 1 /* Generator */)) {
+                // If the user's code is syntactically correct, the func should always have a star. After all, we are in a yield context.
                 return anyType;
             }
             if (node.asteriskToken) {
-                if ((functionFlags & 3) === 3 &&
-                    languageVersion < 6) {
-                    checkExternalEmitHelpers(node, 26624);
+                // Async generator functions prior to ESNext require the __await, __asyncDelegator,
+                // and __asyncValues helpers
+                if ((functionFlags & 3 /* AsyncGenerator */) === 3 /* AsyncGenerator */ &&
+                    languageVersion < 6 /* ESNext */) {
+                    checkExternalEmitHelpers(node, 26624 /* AsyncDelegatorIncludes */);
                 }
-                if ((functionFlags & 3) === 1 &&
-                    languageVersion < 2 && compilerOptions.downlevelIteration) {
-                    checkExternalEmitHelpers(node, 256);
+                // Generator functions prior to ES2015 require the __values helper
+                if ((functionFlags & 3 /* AsyncGenerator */) === 1 /* Generator */ &&
+                    languageVersion < 2 /* ES2015 */ && compilerOptions.downlevelIteration) {
+                    checkExternalEmitHelpers(node, 256 /* Values */);
                 }
             }
-            var isAsync = (functionFlags & 2) !== 0;
-            var yieldedType = getYieldedTypeOfYieldExpression(node, isAsync);
+            var isAsync = (functionFlags & 2 /* Async */) !== 0;
+            var yieldedType = getYieldedTypeOfYieldExpression(node, isAsync); // TODO: GH#18217
+            // There is no point in doing an assignability check if the function
+            // has no explicit return type because the return type is directly computed
+            // from the yield expressions.
             var returnType = ts.getEffectiveReturnTypeNode(func);
             if (returnType) {
                 var signatureElementType = getIteratedTypeOfGenerator(getTypeFromTypeNode(returnType), isAsync) || anyType;
-                checkTypeAssignableTo(yieldedType, signatureElementType, node.expression || node, undefined);
+                checkTypeAssignableTo(yieldedType, signatureElementType, node.expression || node, /*headMessage*/ undefined);
             }
+            // Both yield and yield* expressions have type 'any'
             return anyType;
         }
         function checkConditionalExpression(node, checkMode) {
             checkExpression(node.condition);
             var type1 = checkExpression(node.whenTrue, checkMode);
             var type2 = checkExpression(node.whenFalse, checkMode);
-            return getUnionType([type1, type2], 2);
+            return getUnionType([type1, type2], 2 /* Subtype */);
         }
         function checkTemplateExpression(node) {
+            // We just want to check each expressions, but we are unconcerned with
+            // the type of each expression, as any value may be coerced into a string.
+            // It is worth asking whether this is what we really want though.
+            // A place where we actually *are* concerned with the expressions' types are
+            // in tagged templates.
             ts.forEach(node.templateSpans, function (templateSpan) {
-                if (maybeTypeOfKind(checkExpression(templateSpan.expression), 3072)) {
+                if (maybeTypeOfKind(checkExpression(templateSpan.expression), 3072 /* ESSymbolLike */)) {
                     error(templateSpan.expression, ts.Diagnostics.Type_0_cannot_be_converted_to_type_1, typeToString(esSymbolType), typeToString(stringType));
                 }
             });
             return stringType;
         }
         function getContextNode(node) {
-            if (node.kind === 263) {
-                return node.parent.parent;
+            if (node.kind === 263 /* JsxAttributes */) {
+                return node.parent.parent; // Needs to be the root JsxElement, so it encompasses the attributes _and_ the children (which are essentially part of the attributes)
             }
             return node;
         }
@@ -39073,8 +47912,8 @@ var ts;
             var saveContextualMapper = context.contextualMapper;
             context.contextualType = contextualType;
             context.contextualMapper = contextualMapper;
-            var checkMode = contextualMapper === identityMapper ? 1 :
-                contextualMapper ? 2 : 3;
+            var checkMode = contextualMapper === identityMapper ? 1 /* SkipContextSensitive */ :
+                contextualMapper ? 2 /* Inferential */ : 3 /* Contextual */;
             var result = checkExpression(node, checkMode);
             context.contextualType = saveContextualType;
             context.contextualMapper = saveContextualMapper;
@@ -39086,6 +47925,9 @@ var ts;
                 if (checkMode) {
                     return checkExpression(node, checkMode);
                 }
+                // When computing a type that we're going to cache, we need to ignore any ongoing control flow
+                // analysis because variables may have transient types in indeterminable states. Moving flowLoopStart
+                // to the top of the stack ensures all transient types are computed from a known point.
                 var saveFlowLoopStart = flowLoopStart;
                 flowLoopStart = flowLoopCount;
                 links.resolvedType = checkExpression(node, checkMode);
@@ -39095,16 +47937,16 @@ var ts;
         }
         function isTypeAssertion(node) {
             node = ts.skipParentheses(node);
-            return node.kind === 190 || node.kind === 208;
+            return node.kind === 190 /* TypeAssertionExpression */ || node.kind === 208 /* AsExpression */;
         }
         function checkDeclarationInitializer(declaration) {
             var initializer = ts.getEffectiveInitializer(declaration);
-            var type = getTypeOfExpression(initializer, true);
-            var widened = ts.getCombinedNodeFlags(declaration) & 2 ||
-                (ts.getCombinedModifierFlags(declaration) & 64 && !ts.isParameterPropertyDeclaration(declaration)) ||
+            var type = getTypeOfExpression(initializer, /*cache*/ true);
+            var widened = ts.getCombinedNodeFlags(declaration) & 2 /* Const */ ||
+                (ts.getCombinedModifierFlags(declaration) & 64 /* Readonly */ && !ts.isParameterPropertyDeclaration(declaration)) ||
                 isTypeAssertion(initializer) ? type : getWidenedLiteralType(type);
             if (ts.isInJavaScriptFile(declaration)) {
-                if (widened.flags & 24576) {
+                if (widened.flags & 24576 /* Nullable */) {
                     if (noImplicitAny) {
                         reportImplicitAnyError(declaration, anyType);
                     }
@@ -39121,21 +47963,26 @@ var ts;
         }
         function isLiteralOfContextualType(candidateType, contextualType) {
             if (contextualType) {
-                if (contextualType.flags & 786432) {
+                if (contextualType.flags & 786432 /* UnionOrIntersection */) {
                     var types = contextualType.types;
                     return ts.some(types, function (t) { return isLiteralOfContextualType(candidateType, t); });
                 }
-                if (contextualType.flags & 14745600) {
+                if (contextualType.flags & 14745600 /* InstantiableNonPrimitive */) {
+                    // If the contextual type is a type variable constrained to a primitive type, consider
+                    // this a literal context for literals of that primitive type. For example, given a
+                    // type parameter 'T extends string', infer string literal types for T.
                     var constraint = getBaseConstraintOfType(contextualType) || emptyObjectType;
-                    return maybeTypeOfKind(constraint, 4) && maybeTypeOfKind(candidateType, 64) ||
-                        maybeTypeOfKind(constraint, 8) && maybeTypeOfKind(candidateType, 128) ||
-                        maybeTypeOfKind(constraint, 1024) && maybeTypeOfKind(candidateType, 2048) ||
+                    return maybeTypeOfKind(constraint, 4 /* String */) && maybeTypeOfKind(candidateType, 64 /* StringLiteral */) ||
+                        maybeTypeOfKind(constraint, 8 /* Number */) && maybeTypeOfKind(candidateType, 128 /* NumberLiteral */) ||
+                        maybeTypeOfKind(constraint, 1024 /* ESSymbol */) && maybeTypeOfKind(candidateType, 2048 /* UniqueESSymbol */) ||
                         isLiteralOfContextualType(candidateType, constraint);
                 }
-                return !!(contextualType.flags & (64 | 1048576) && maybeTypeOfKind(candidateType, 64) ||
-                    contextualType.flags & 128 && maybeTypeOfKind(candidateType, 128) ||
-                    contextualType.flags & 256 && maybeTypeOfKind(candidateType, 256) ||
-                    contextualType.flags & 2048 && maybeTypeOfKind(candidateType, 2048));
+                // If the contextual type is a literal of a particular primitive type, we consider this a
+                // literal context for all literals of that primitive type.
+                return !!(contextualType.flags & (64 /* StringLiteral */ | 1048576 /* Index */) && maybeTypeOfKind(candidateType, 64 /* StringLiteral */) ||
+                    contextualType.flags & 128 /* NumberLiteral */ && maybeTypeOfKind(candidateType, 128 /* NumberLiteral */) ||
+                    contextualType.flags & 256 /* BooleanLiteral */ && maybeTypeOfKind(candidateType, 256 /* BooleanLiteral */) ||
+                    contextualType.flags & 2048 /* UniqueESSymbol */ && maybeTypeOfKind(candidateType, 2048 /* UniqueESSymbol */));
             }
             return false;
         }
@@ -39148,21 +47995,28 @@ var ts;
                 getWidenedLiteralLikeTypeForContextualType(type, contextualType);
         }
         function checkPropertyAssignment(node, checkMode) {
-            if (node.name.kind === 147) {
+            // Do not use hasDynamicName here, because that returns false for well known symbols.
+            // We want to perform checkComputedPropertyName for all computed properties, including
+            // well known symbols.
+            if (node.name.kind === 147 /* ComputedPropertyName */) {
                 checkComputedPropertyName(node.name);
             }
             return checkExpressionForMutableLocation(node.initializer, checkMode);
         }
         function checkObjectLiteralMethod(node, checkMode) {
+            // Grammar checking
             checkGrammarMethod(node);
-            if (node.name.kind === 147) {
+            // Do not use hasDynamicName here, because that returns false for well known symbols.
+            // We want to perform checkComputedPropertyName for all computed properties, including
+            // well known symbols.
+            if (node.name.kind === 147 /* ComputedPropertyName */) {
                 checkComputedPropertyName(node.name);
             }
             var uninstantiatedType = checkFunctionExpressionOrObjectLiteralMethod(node, checkMode);
             return instantiateTypeWithSingleGenericCallSignature(node, uninstantiatedType, checkMode);
         }
         function instantiateTypeWithSingleGenericCallSignature(node, type, checkMode) {
-            if (checkMode === 2) {
+            if (checkMode === 2 /* Inferential */) {
                 var signature = getSingleCallSignature(type);
                 if (signature && signature.typeParameters) {
                     var contextualType = getApparentTypeOfContextualType(node);
@@ -39176,16 +48030,34 @@ var ts;
             }
             return type;
         }
+        /**
+         * Returns the type of an expression. Unlike checkExpression, this function is simply concerned
+         * with computing the type and may not fully check all contained sub-expressions for errors.
+         * A cache argument of true indicates that if the function performs a full type check, it is ok
+         * to cache the result.
+         */
         function getTypeOfExpression(node, cache) {
-            if (node.kind === 187 && node.expression.kind !== 97 && !ts.isRequireCall(node, true) && !isSymbolOrSymbolForCall(node)) {
+            // Optimize for the common case of a call to a function with a single non-generic call
+            // signature where we can just fetch the return type without checking the arguments.
+            if (node.kind === 187 /* CallExpression */ && node.expression.kind !== 97 /* SuperKeyword */ && !ts.isRequireCall(node, /*checkArgumentIsStringLiteralLike*/ true) && !isSymbolOrSymbolForCall(node)) {
                 var funcType = checkNonNullExpression(node.expression);
                 var signature = getSingleCallSignature(funcType);
                 if (signature && !signature.typeParameters) {
                     return getReturnTypeOfSignature(signature);
                 }
             }
+            // Otherwise simply call checkExpression. Ideally, the entire family of checkXXX functions
+            // should have a parameter that indicates whether full error checking is required such that
+            // we can perform the optimizations locally.
             return cache ? checkExpressionCached(node) : checkExpression(node);
         }
+        /**
+         * Returns the type of an expression. Unlike checkExpression, this function is simply concerned
+         * with computing the type and may not fully check all contained sub-expressions for errors.
+         * It is intended for uses where you know there is no contextual type,
+         * and requesting the contextual type might cause a circularity or other bad behaviour.
+         * It sets the contextual type of the node to any before calling getTypeOfExpression.
+         */
         function getContextFreeTypeOfExpression(node) {
             var saveContextualType = node.contextualType;
             node.contextualType = anyType;
@@ -39193,9 +48065,19 @@ var ts;
             node.contextualType = saveContextualType;
             return type;
         }
+        function checkExpresionNoReturn(node) {
+            checkExpression(node);
+        }
+        // Checks an expression and returns its type. The contextualMapper parameter serves two purposes: When
+        // contextualMapper is not undefined and not equal to the identityMapper function object it indicates that the
+        // expression is being inferentially typed (section 4.15.2 in spec) and provides the type mapper to use in
+        // conjunction with the generic contextual type. When contextualMapper is equal to the identityMapper function
+        // object, it serves as an indicator that all contained function and arrow expressions should be considered to
+        // have the wildcard function type; this form of type check is used during overload resolution to exclude
+        // contextually typed function and arrow expressions in the initial phase.
         function checkExpression(node, checkMode) {
             var type;
-            if (node.kind === 146) {
+            if (node.kind === 146 /* QualifiedName */) {
                 type = checkQualifiedName(node);
             }
             else {
@@ -39203,10 +48085,14 @@ var ts;
                 type = instantiateTypeWithSingleGenericCallSignature(node, uninstantiatedType, checkMode);
             }
             if (isConstEnumObjectType(type)) {
-                var ok = (node.parent.kind === 185 && node.parent.expression === node) ||
-                    (node.parent.kind === 186 && node.parent.expression === node) ||
-                    ((node.kind === 71 || node.kind === 146) && isInRightSideOfImportOrExportAssignment(node) ||
-                        (node.parent.kind === 165 && node.parent.exprName === node));
+                // enum object type for const enums are only permitted in:
+                // - 'left' in property access
+                // - 'object' in indexed access
+                // - target in rhs of import statement
+                var ok = (node.parent.kind === 185 /* PropertyAccessExpression */ && node.parent.expression === node) ||
+                    (node.parent.kind === 186 /* ElementAccessExpression */ && node.parent.expression === node) ||
+                    ((node.kind === 71 /* Identifier */ || node.kind === 146 /* QualifiedName */) && isInRightSideOfImportOrExportAssignment(node) ||
+                        (node.parent.kind === 165 /* TypeQuery */ && node.parent.exprName === node));
                 if (!ok) {
                     error(node, ts.Diagnostics.const_enums_can_only_be_used_in_property_or_index_access_expressions_or_the_right_hand_side_of_an_import_declaration_or_export_assignment_or_type_query);
                 }
@@ -39222,96 +48108,99 @@ var ts;
         }
         function checkExpressionWorker(node, checkMode) {
             switch (node.kind) {
-                case 71:
+                case 71 /* Identifier */:
                     return checkIdentifier(node);
-                case 99:
+                case 99 /* ThisKeyword */:
                     return checkThisExpression(node);
-                case 97:
+                case 97 /* SuperKeyword */:
                     return checkSuperExpression(node);
-                case 95:
+                case 95 /* NullKeyword */:
                     return nullWideningType;
-                case 13:
-                case 9:
+                case 13 /* NoSubstitutionTemplateLiteral */:
+                case 9 /* StringLiteral */:
                     return getFreshTypeOfLiteralType(getLiteralType(node.text));
-                case 8:
+                case 8 /* NumericLiteral */:
                     checkGrammarNumericLiteral(node);
                     return getFreshTypeOfLiteralType(getLiteralType(+node.text));
-                case 101:
+                case 101 /* TrueKeyword */:
                     return trueType;
-                case 86:
+                case 86 /* FalseKeyword */:
                     return falseType;
-                case 202:
+                case 202 /* TemplateExpression */:
                     return checkTemplateExpression(node);
-                case 12:
+                case 12 /* RegularExpressionLiteral */:
                     return globalRegExpType;
-                case 183:
+                case 183 /* ArrayLiteralExpression */:
                     return checkArrayLiteral(node, checkMode);
-                case 184:
+                case 184 /* ObjectLiteralExpression */:
                     return checkObjectLiteral(node, checkMode);
-                case 185:
+                case 185 /* PropertyAccessExpression */:
                     return checkPropertyAccessExpression(node);
-                case 186:
+                case 186 /* ElementAccessExpression */:
                     return checkIndexedAccess(node);
-                case 187:
-                    if (node.expression.kind === 91) {
+                case 187 /* CallExpression */:
+                    if (node.expression.kind === 91 /* ImportKeyword */) {
                         return checkImportCallExpression(node);
                     }
-                case 188:
+                /* falls through */
+                case 188 /* NewExpression */:
                     return checkCallExpression(node);
-                case 189:
+                case 189 /* TaggedTemplateExpression */:
                     return checkTaggedTemplateExpression(node);
-                case 191:
+                case 191 /* ParenthesizedExpression */:
                     return checkParenthesizedExpression(node, checkMode);
-                case 205:
+                case 205 /* ClassExpression */:
                     return checkClassExpression(node);
-                case 192:
-                case 193:
+                case 192 /* FunctionExpression */:
+                case 193 /* ArrowFunction */:
                     return checkFunctionExpressionOrObjectLiteralMethod(node, checkMode);
-                case 195:
+                case 195 /* TypeOfExpression */:
                     return checkTypeOfExpression(node);
-                case 190:
-                case 208:
+                case 190 /* TypeAssertionExpression */:
+                case 208 /* AsExpression */:
                     return checkAssertion(node);
-                case 209:
+                case 209 /* NonNullExpression */:
                     return checkNonNullAssertion(node);
-                case 210:
+                case 210 /* MetaProperty */:
                     return checkMetaProperty(node);
-                case 194:
+                case 194 /* DeleteExpression */:
                     return checkDeleteExpression(node);
-                case 196:
+                case 196 /* VoidExpression */:
                     return checkVoidExpression(node);
-                case 197:
+                case 197 /* AwaitExpression */:
                     return checkAwaitExpression(node);
-                case 198:
+                case 198 /* PrefixUnaryExpression */:
                     return checkPrefixUnaryExpression(node);
-                case 199:
+                case 199 /* PostfixUnaryExpression */:
                     return checkPostfixUnaryExpression(node);
-                case 200:
+                case 200 /* BinaryExpression */:
                     return checkBinaryExpression(node, checkMode);
-                case 201:
+                case 201 /* ConditionalExpression */:
                     return checkConditionalExpression(node, checkMode);
-                case 204:
+                case 204 /* SpreadElement */:
                     return checkSpreadExpression(node, checkMode);
-                case 206:
+                case 206 /* OmittedExpression */:
                     return undefinedWideningType;
-                case 203:
+                case 203 /* YieldExpression */:
                     return checkYieldExpression(node);
-                case 265:
+                case 265 /* JsxExpression */:
                     return checkJsxExpression(node, checkMode);
-                case 255:
+                case 255 /* JsxElement */:
                     return checkJsxElement(node, checkMode);
-                case 256:
+                case 256 /* JsxSelfClosingElement */:
                     return checkJsxSelfClosingElement(node, checkMode);
-                case 259:
+                case 259 /* JsxFragment */:
                     return checkJsxFragment(node, checkMode);
-                case 263:
+                case 263 /* JsxAttributes */:
                     return checkJsxAttributes(node, checkMode);
-                case 257:
+                case 257 /* JsxOpeningElement */:
                     ts.Debug.fail("Shouldn't ever directly check a JsxOpeningElement");
             }
             return errorType;
         }
+        // DECLARATION AND STATEMENT TYPE CHECKING
         function checkTypeParameter(node) {
+            // Grammar Checking
             if (node.expression) {
                 grammarErrorOnFirstToken(node.expression, ts.Diagnostics.Type_expected);
             }
@@ -39334,11 +48223,15 @@ var ts;
             }
         }
         function checkParameter(node) {
+            // Grammar checking
+            // It is a SyntaxError if the Identifier "eval" or the Identifier "arguments" occurs as the
+            // Identifier in a PropertySetParameterList of a PropertyAssignment that is contained in strict code
+            // or if its FunctionBody is strict code(11.1.5).
             checkGrammarDecoratorsAndModifiers(node);
             checkVariableLikeDeclaration(node);
             var func = ts.getContainingFunction(node);
-            if (ts.hasModifier(node, 92)) {
-                if (!(func.kind === 155 && ts.nodeIsPresent(func.body))) {
+            if (ts.hasModifier(node, 92 /* ParameterPropertyModifier */)) {
+                if (!(func.kind === 155 /* Constructor */ && ts.nodeIsPresent(func.body))) {
                     error(node, ts.Diagnostics.A_parameter_property_is_only_allowed_in_a_constructor_implementation);
                 }
             }
@@ -39349,10 +48242,12 @@ var ts;
                 if (func.parameters.indexOf(node) !== 0) {
                     error(node, ts.Diagnostics.A_0_parameter_must_be_the_first_parameter, node.name.escapedText);
                 }
-                if (func.kind === 155 || func.kind === 159 || func.kind === 164) {
+                if (func.kind === 155 /* Constructor */ || func.kind === 159 /* ConstructSignature */ || func.kind === 164 /* ConstructorType */) {
                     error(node, ts.Diagnostics.A_constructor_cannot_have_a_this_parameter);
                 }
             }
+            // Only check rest parameter type if it's not a binding pattern. Since binding patterns are
+            // not allowed in a rest parameter, we already have an error from checkGrammarParameterList.
             if (node.dotDotDotToken && !ts.isBindingPattern(node.name) && !isArrayType(getTypeOfSymbol(node.symbol))) {
                 error(node, ts.Diagnostics.A_rest_parameter_must_be_of_an_array_type);
             }
@@ -39361,7 +48256,7 @@ var ts;
             if (parameterList) {
                 for (var i = 0; i < parameterList.length; i++) {
                     var param = parameterList[i];
-                    if (param.name.kind === 71 && param.name.escapedText === parameter.escapedText) {
+                    if (param.name.kind === 71 /* Identifier */ && param.name.escapedText === parameter.escapedText) {
                         return i;
                     }
                 }
@@ -39371,6 +48266,7 @@ var ts;
         function checkTypePredicate(node) {
             var parent = getTypePredicateParent(node);
             if (!parent) {
+                // The parent must not be valid.
                 error(node, ts.Diagnostics.A_type_predicate_is_only_allowed_in_return_type_position_for_functions_and_methods);
                 return;
             }
@@ -39389,8 +48285,10 @@ var ts;
                         error(parameterName, ts.Diagnostics.A_type_predicate_cannot_reference_a_rest_parameter);
                     }
                     else {
-                        var leadingError = function () { return ts.chainDiagnosticMessages(undefined, ts.Diagnostics.A_type_predicate_s_type_must_be_assignable_to_its_parameter_s_type); };
-                        checkTypeAssignableTo(typePredicate.type, getTypeOfNode(parent.parameters[typePredicate.parameterIndex]), node.type, undefined, leadingError);
+                        var leadingError = function () { return ts.chainDiagnosticMessages(/*details*/ undefined, ts.Diagnostics.A_type_predicate_s_type_must_be_assignable_to_its_parameter_s_type); };
+                        checkTypeAssignableTo(typePredicate.type, getTypeOfNode(parent.parameters[typePredicate.parameterIndex]), // TODO: GH#18217
+                        node.type, 
+                        /*headMessage*/ undefined, leadingError);
                     }
                 }
                 else if (parameterName) {
@@ -39411,13 +48309,13 @@ var ts;
         }
         function getTypePredicateParent(node) {
             switch (node.parent.kind) {
-                case 193:
-                case 158:
-                case 234:
-                case 192:
-                case 163:
-                case 154:
-                case 153:
+                case 193 /* ArrowFunction */:
+                case 158 /* CallSignature */:
+                case 234 /* FunctionDeclaration */:
+                case 192 /* FunctionExpression */:
+                case 163 /* FunctionType */:
+                case 154 /* MethodDeclaration */:
+                case 153 /* MethodSignature */:
                     var parent = node.parent;
                     if (node === parent.type) {
                         return parent;
@@ -39431,11 +48329,11 @@ var ts;
                     continue;
                 }
                 var name = element.name;
-                if (name.kind === 71 && name.escapedText === predicateVariableName) {
+                if (name.kind === 71 /* Identifier */ && name.escapedText === predicateVariableName) {
                     error(predicateVariableNode, ts.Diagnostics.A_type_predicate_cannot_reference_element_0_in_a_binding_pattern, predicateVariableName);
                     return true;
                 }
-                else if (name.kind === 181 || name.kind === 180) {
+                else if (name.kind === 181 /* ArrayBindingPattern */ || name.kind === 180 /* ObjectBindingPattern */) {
                     if (checkIfTypePredicateVariableIsDeclaredInBindingPattern(name, predicateVariableNode, predicateVariableName)) {
                         return true;
                     }
@@ -39443,28 +48341,35 @@ var ts;
             }
         }
         function checkSignatureDeclaration(node) {
-            if (node.kind === 160) {
+            // Grammar checking
+            if (node.kind === 160 /* IndexSignature */) {
                 checkGrammarIndexSignature(node);
             }
-            else if (node.kind === 163 || node.kind === 234 || node.kind === 164 ||
-                node.kind === 158 || node.kind === 155 ||
-                node.kind === 159) {
+            // TODO (yuisu): Remove this check in else-if when SyntaxKind.Construct is moved and ambient context is handled
+            else if (node.kind === 163 /* FunctionType */ || node.kind === 234 /* FunctionDeclaration */ || node.kind === 164 /* ConstructorType */ ||
+                node.kind === 158 /* CallSignature */ || node.kind === 155 /* Constructor */ ||
+                node.kind === 159 /* ConstructSignature */) {
                 checkGrammarFunctionLikeDeclaration(node);
             }
             var functionFlags = ts.getFunctionFlags(node);
-            if (!(functionFlags & 4)) {
-                if ((functionFlags & 3) === 3 && languageVersion < 6) {
-                    checkExternalEmitHelpers(node, 6144);
+            if (!(functionFlags & 4 /* Invalid */)) {
+                // Async generators prior to ESNext require the __await and __asyncGenerator helpers
+                if ((functionFlags & 3 /* AsyncGenerator */) === 3 /* AsyncGenerator */ && languageVersion < 6 /* ESNext */) {
+                    checkExternalEmitHelpers(node, 6144 /* AsyncGeneratorIncludes */);
                 }
-                if ((functionFlags & 3) === 2 && languageVersion < 4) {
-                    checkExternalEmitHelpers(node, 64);
+                // Async functions prior to ES2017 require the __awaiter helper
+                if ((functionFlags & 3 /* AsyncGenerator */) === 2 /* Async */ && languageVersion < 4 /* ES2017 */) {
+                    checkExternalEmitHelpers(node, 64 /* Awaiter */);
                 }
-                if ((functionFlags & 3) !== 0 && languageVersion < 2) {
-                    checkExternalEmitHelpers(node, 128);
+                // Generator functions, Async functions, and Async Generator functions prior to
+                // ES2015 require the __generator helper
+                if ((functionFlags & 3 /* AsyncGenerator */) !== 0 /* Normal */ && languageVersion < 2 /* ES2015 */) {
+                    checkExternalEmitHelpers(node, 128 /* Generator */);
                 }
             }
             checkTypeParameters(node.typeParameters);
             ts.forEach(node.parameters, checkParameter);
+            // TODO(rbuckton): Should we start checking JSDoc types?
             if (node.type) {
                 checkSourceElement(node.type);
             }
@@ -39473,34 +48378,40 @@ var ts;
                 var returnTypeNode = ts.getEffectiveReturnTypeNode(node);
                 if (noImplicitAny && !returnTypeNode) {
                     switch (node.kind) {
-                        case 159:
+                        case 159 /* ConstructSignature */:
                             error(node, ts.Diagnostics.Construct_signature_which_lacks_return_type_annotation_implicitly_has_an_any_return_type);
                             break;
-                        case 158:
+                        case 158 /* CallSignature */:
                             error(node, ts.Diagnostics.Call_signature_which_lacks_return_type_annotation_implicitly_has_an_any_return_type);
                             break;
                     }
                 }
                 if (returnTypeNode) {
                     var functionFlags_1 = ts.getFunctionFlags(node);
-                    if ((functionFlags_1 & (4 | 1)) === 1) {
+                    if ((functionFlags_1 & (4 /* Invalid */ | 1 /* Generator */)) === 1 /* Generator */) {
                         var returnType = getTypeFromTypeNode(returnTypeNode);
                         if (returnType === voidType) {
                             error(returnTypeNode, ts.Diagnostics.A_generator_cannot_have_a_void_type_annotation);
                         }
                         else {
-                            var generatorElementType = getIteratedTypeOfGenerator(returnType, (functionFlags_1 & 2) !== 0) || anyType;
-                            var iterableIteratorInstantiation = functionFlags_1 & 2
-                                ? createAsyncIterableIteratorType(generatorElementType)
-                                : createIterableIteratorType(generatorElementType);
+                            var generatorElementType = getIteratedTypeOfGenerator(returnType, (functionFlags_1 & 2 /* Async */) !== 0) || anyType;
+                            var iterableIteratorInstantiation = functionFlags_1 & 2 /* Async */
+                                ? createAsyncIterableIteratorType(generatorElementType) // AsyncGenerator function
+                                : createIterableIteratorType(generatorElementType); // Generator function
+                            // Naively, one could check that IterableIterator<any> is assignable to the return type annotation.
+                            // However, that would not catch the error in the following case.
+                            //
+                            //    interface BadGenerator extends Iterable<number>, Iterator<string> { }
+                            //    function* g(): BadGenerator { } // Iterable and Iterator have different types!
+                            //
                             checkTypeAssignableTo(iterableIteratorInstantiation, returnType, returnTypeNode);
                         }
                     }
-                    else if ((functionFlags_1 & 3) === 2) {
+                    else if ((functionFlags_1 & 3 /* AsyncGenerator */) === 2 /* Async */) {
                         checkAsyncFunctionReturnType(node);
                     }
                 }
-                if (node.kind !== 160 && node.kind !== 284) {
+                if (node.kind !== 160 /* IndexSignature */ && node.kind !== 284 /* JSDocFunctionType */) {
                     registerForUnusedIdentifiersCheck(node);
                 }
             }
@@ -39517,32 +48428,32 @@ var ts;
             var staticNames = ts.createUnderscoreEscapedMap();
             for (var _i = 0, _a = node.members; _i < _a.length; _i++) {
                 var member = _a[_i];
-                if (member.kind === 155) {
+                if (member.kind === 155 /* Constructor */) {
                     for (var _b = 0, _c = member.parameters; _b < _c.length; _b++) {
                         var param = _c[_b];
                         if (ts.isParameterPropertyDeclaration(param) && !ts.isBindingPattern(param.name)) {
-                            addName(instanceNames, param.name, param.name.escapedText, 3);
+                            addName(instanceNames, param.name, param.name.escapedText, 3 /* Property */);
                         }
                     }
                 }
                 else {
-                    var isStatic = ts.hasModifier(member, 32);
+                    var isStatic = ts.hasModifier(member, 32 /* Static */);
                     var names = isStatic ? staticNames : instanceNames;
                     var name = member.name;
                     var memberName = name && ts.getPropertyNameForPropertyNameNode(name);
                     if (name && memberName) {
                         switch (member.kind) {
-                            case 156:
-                                addName(names, name, memberName, 1);
+                            case 156 /* GetAccessor */:
+                                addName(names, name, memberName, 1 /* Getter */);
                                 break;
-                            case 157:
-                                addName(names, name, memberName, 2);
+                            case 157 /* SetAccessor */:
+                                addName(names, name, memberName, 2 /* Setter */);
                                 break;
-                            case 152:
-                                addName(names, name, memberName, 3);
+                            case 152 /* PropertyDeclaration */:
+                                addName(names, name, memberName, 3 /* Property */);
                                 break;
-                            case 154:
-                                addName(names, name, memberName, 4);
+                            case 154 /* MethodDeclaration */:
+                                addName(names, name, memberName, 4 /* Method */);
                                 break;
                         }
                     }
@@ -39551,8 +48462,8 @@ var ts;
             function addName(names, location, name, meaning) {
                 var prev = names.get(name);
                 if (prev) {
-                    if (prev & 4) {
-                        if (meaning !== 4) {
+                    if (prev & 4 /* Method */) {
+                        if (meaning !== 4 /* Method */) {
                             error(location, ts.Diagnostics.Duplicate_identifier_0, ts.getTextOfNode(location));
                         }
                     }
@@ -39568,11 +48479,22 @@ var ts;
                 }
             }
         }
+        /**
+         * Static members being set on a constructor function may conflict with built-in properties
+         * of Function. Esp. in ECMAScript 5 there are non-configurable and non-writable
+         * built-in properties. This check issues a transpile error when a class has a static
+         * member with the same name as a non-writable built-in property.
+         *
+         * @see http://www.ecma-international.org/ecma-262/5.1/#sec-15.3.3
+         * @see http://www.ecma-international.org/ecma-262/5.1/#sec-15.3.5
+         * @see http://www.ecma-international.org/ecma-262/6.0/#sec-properties-of-the-function-constructor
+         * @see http://www.ecma-international.org/ecma-262/6.0/#sec-function-instances
+         */
         function checkClassForStaticPropertyNameConflicts(node) {
             for (var _i = 0, _a = node.members; _i < _a.length; _i++) {
                 var member = _a[_i];
                 var memberNameNode = member.name;
-                var isStatic = ts.hasModifier(member, 32);
+                var isStatic = ts.hasModifier(member, 32 /* Static */);
                 if (isStatic && memberNameNode) {
                     var memberName = ts.getPropertyNameForPropertyNameNode(memberNameNode);
                     switch (memberName) {
@@ -39593,15 +48515,15 @@ var ts;
             var names = ts.createMap();
             for (var _i = 0, _a = node.members; _i < _a.length; _i++) {
                 var member = _a[_i];
-                if (member.kind === 151) {
+                if (member.kind === 151 /* PropertySignature */) {
                     var memberName = void 0;
                     var name = member.name;
                     switch (name.kind) {
-                        case 9:
-                        case 8:
+                        case 9 /* StringLiteral */:
+                        case 8 /* NumericLiteral */:
                             memberName = name.text;
                             break;
-                        case 71:
+                        case 71 /* Identifier */:
                             memberName = ts.idText(name);
                             break;
                         default:
@@ -39618,12 +48540,17 @@ var ts;
             }
         }
         function checkTypeForDuplicateIndexSignatures(node) {
-            if (node.kind === 236) {
+            if (node.kind === 236 /* InterfaceDeclaration */) {
                 var nodeSymbol = getSymbolOfNode(node);
+                // in case of merging interface declaration it is possible that we'll enter this check procedure several times for every declaration
+                // to prevent this run check only for the first declaration of a given kind
                 if (nodeSymbol.declarations.length > 0 && nodeSymbol.declarations[0] !== node) {
                     return;
                 }
             }
+            // TypeScript 1.0 spec (April 2014)
+            // 3.7.4: An object type can contain at most one string index signature and one numeric index signature.
+            // 8.5: A class declaration can have at most one string index member declaration and one numeric index member declaration
             var indexSymbol = getIndexSymbol(getSymbolOfNode(node));
             if (indexSymbol) {
                 var seenNumericIndexer = false;
@@ -39633,7 +48560,7 @@ var ts;
                     var declaration = decl;
                     if (declaration.parameters.length === 1 && declaration.parameters[0].type) {
                         switch (declaration.parameters[0].type.kind) {
-                            case 137:
+                            case 137 /* StringKeyword */:
                                 if (!seenStringIndexer) {
                                     seenStringIndexer = true;
                                 }
@@ -39641,7 +48568,7 @@ var ts;
                                     error(declaration, ts.Diagnostics.Duplicate_string_index_signature);
                                 }
                                 break;
-                            case 134:
+                            case 134 /* NumberKeyword */:
                                 if (!seenNumericIndexer) {
                                     seenNumericIndexer = true;
                                 }
@@ -39655,28 +48582,37 @@ var ts;
             }
         }
         function checkPropertyDeclaration(node) {
+            // Grammar checking
             if (!checkGrammarDecoratorsAndModifiers(node) && !checkGrammarProperty(node))
                 checkGrammarComputedPropertyName(node.name);
             checkVariableLikeDeclaration(node);
         }
         function checkMethodDeclaration(node) {
+            // Grammar checking
             if (!checkGrammarMethod(node))
                 checkGrammarComputedPropertyName(node.name);
+            // Grammar checking for modifiers is done inside the function checkGrammarFunctionLikeDeclaration
             checkFunctionOrMethodDeclaration(node);
-            if (ts.hasModifier(node, 128) && node.kind === 154 && node.body) {
+            // Abstract methods cannot have an implementation.
+            // Extra checks are to avoid reporting multiple errors relating to the "abstractness" of the node.
+            if (ts.hasModifier(node, 128 /* Abstract */) && node.kind === 154 /* MethodDeclaration */ && node.body) {
                 error(node, ts.Diagnostics.Method_0_cannot_have_an_implementation_because_it_is_marked_abstract, ts.declarationNameToString(node.name));
             }
         }
         function checkConstructorDeclaration(node) {
+            // Grammar check on signature of constructor and modifier of the constructor is done in checkSignatureDeclaration function.
             checkSignatureDeclaration(node);
+            // Grammar check for checking only related to constructorDeclaration
             if (!checkGrammarConstructorTypeParameters(node))
                 checkGrammarConstructorTypeAnnotation(node);
             checkSourceElement(node.body);
             var symbol = getSymbolOfNode(node);
             var firstDeclaration = ts.getDeclarationOfKind(symbol, node.kind);
+            // Only type check the symbol once
             if (node === firstDeclaration) {
                 checkFunctionOrConstructorSymbol(symbol);
             }
+            // exit early in the case of signature - super checks are not relevant to them
             if (ts.nodeIsMissing(node.body)) {
                 return;
             }
@@ -39684,10 +48620,13 @@ var ts;
                 return;
             }
             function isInstancePropertyWithInitializer(n) {
-                return n.kind === 152 &&
-                    !ts.hasModifier(n, 32) &&
+                return n.kind === 152 /* PropertyDeclaration */ &&
+                    !ts.hasModifier(n, 32 /* Static */) &&
                     !!n.initializer;
             }
+            // TS 1.0 spec (April 2014): 8.3.2
+            // Constructors of classes with no extends clause may not contain super calls, whereas
+            // constructors of derived classes must contain at least one super call somewhere in their function body.
             var containingClassDecl = node.parent;
             if (ts.getClassExtendsHeritageClauseElement(containingClassDecl)) {
                 captureLexicalThis(node.parent, containingClassDecl);
@@ -39697,14 +48636,21 @@ var ts;
                     if (classExtendsNull) {
                         error(superCall, ts.Diagnostics.A_constructor_cannot_contain_a_super_call_when_its_class_extends_null);
                     }
+                    // The first statement in the body of a constructor (excluding prologue directives) must be a super call
+                    // if both of the following are true:
+                    // - The containing class is a derived class.
+                    // - The constructor declares parameter properties
+                    //   or the containing class declares instance member variables with initializers.
                     var superCallShouldBeFirst = ts.some(node.parent.members, isInstancePropertyWithInitializer) ||
-                        ts.some(node.parameters, function (p) { return ts.hasModifier(p, 92); });
+                        ts.some(node.parameters, function (p) { return ts.hasModifier(p, 92 /* ParameterPropertyModifier */); });
+                    // Skip past any prologue directives to find the first statement
+                    // to ensure that it was a super call.
                     if (superCallShouldBeFirst) {
                         var statements = node.body.statements;
                         var superCallStatement = void 0;
                         for (var _i = 0, statements_2 = statements; _i < statements_2.length; _i++) {
                             var statement = statements_2[_i];
-                            if (statement.kind === 216 && ts.isSuperCall(statement.expression)) {
+                            if (statement.kind === 216 /* ExpressionStatement */ && ts.isSuperCall(statement.expression)) {
                                 superCallStatement = statement;
                                 break;
                             }
@@ -39724,38 +48670,46 @@ var ts;
         }
         function checkAccessorDeclaration(node) {
             if (produceDiagnostics) {
+                // Grammar checking accessors
                 if (!checkGrammarFunctionLikeDeclaration(node) && !checkGrammarAccessor(node))
                     checkGrammarComputedPropertyName(node.name);
                 checkDecorators(node);
                 checkSignatureDeclaration(node);
-                if (node.kind === 156) {
-                    if (!(node.flags & 4194304) && ts.nodeIsPresent(node.body) && (node.flags & 128)) {
-                        if (!(node.flags & 256)) {
+                if (node.kind === 156 /* GetAccessor */) {
+                    if (!(node.flags & 4194304 /* Ambient */) && ts.nodeIsPresent(node.body) && (node.flags & 128 /* HasImplicitReturn */)) {
+                        if (!(node.flags & 256 /* HasExplicitReturn */)) {
                             error(node.name, ts.Diagnostics.A_get_accessor_must_return_a_value);
                         }
                     }
                 }
-                if (node.name.kind === 147) {
+                // Do not use hasDynamicName here, because that returns false for well known symbols.
+                // We want to perform checkComputedPropertyName for all computed properties, including
+                // well known symbols.
+                if (node.name.kind === 147 /* ComputedPropertyName */) {
                     checkComputedPropertyName(node.name);
                 }
                 if (!hasNonBindableDynamicName(node)) {
-                    var otherKind = node.kind === 156 ? 157 : 156;
+                    // TypeScript 1.0 spec (April 2014): 8.4.3
+                    // Accessors for the same member name must specify the same accessibility.
+                    var otherKind = node.kind === 156 /* GetAccessor */ ? 157 /* SetAccessor */ : 156 /* GetAccessor */;
                     var otherAccessor = ts.getDeclarationOfKind(getSymbolOfNode(node), otherKind);
                     if (otherAccessor) {
                         var nodeFlags = ts.getModifierFlags(node);
                         var otherFlags = ts.getModifierFlags(otherAccessor);
-                        if ((nodeFlags & 28) !== (otherFlags & 28)) {
+                        if ((nodeFlags & 28 /* AccessibilityModifier */) !== (otherFlags & 28 /* AccessibilityModifier */)) {
                             error(node.name, ts.Diagnostics.Getter_and_setter_accessors_do_not_agree_in_visibility);
                         }
-                        if ((nodeFlags & 128) !== (otherFlags & 128)) {
+                        if ((nodeFlags & 128 /* Abstract */) !== (otherFlags & 128 /* Abstract */)) {
                             error(node.name, ts.Diagnostics.Accessors_must_both_be_abstract_or_non_abstract);
                         }
+                        // TypeScript 1.0 spec (April 2014): 4.5
+                        // If both accessors include type annotations, the specified types must be identical.
                         checkAccessorDeclarationTypesIdentical(node, otherAccessor, getAnnotatedAccessorType, ts.Diagnostics.get_and_set_accessor_must_have_the_same_type);
                         checkAccessorDeclarationTypesIdentical(node, otherAccessor, getThisTypeOfDeclaration, ts.Diagnostics.get_and_set_accessor_must_have_the_same_this_type);
                     }
                 }
                 var returnType = getTypeOfAccessors(getSymbolOfNode(node));
-                if (node.kind === 156) {
+                if (node.kind === 156 /* GetAccessor */) {
                     checkAllCodePathsInNonVoidFunctionReturnOrThrow(node, returnType);
                 }
             }
@@ -39795,20 +48749,21 @@ var ts;
             if (type !== errorType) {
                 var symbol = getNodeLinks(node).resolvedSymbol;
                 if (symbol) {
-                    return symbol.flags & 524288 && getSymbolLinks(symbol).typeParameters ||
-                        (ts.getObjectFlags(type) & 4 ? type.target.localTypeParameters : undefined);
+                    return symbol.flags & 524288 /* TypeAlias */ && getSymbolLinks(symbol).typeParameters ||
+                        (ts.getObjectFlags(type) & 4 /* Reference */ ? type.target.localTypeParameters : undefined);
                 }
             }
             return undefined;
         }
         function checkTypeReferenceNode(node) {
             checkGrammarTypeArguments(node, node.typeArguments);
-            if (node.kind === 162 && node.typeName.jsdocDotPos !== undefined && !ts.isInJavaScriptFile(node) && !ts.isInJSDoc(node)) {
+            if (node.kind === 162 /* TypeReference */ && node.typeName.jsdocDotPos !== undefined && !ts.isInJavaScriptFile(node) && !ts.isInJSDoc(node)) {
                 grammarErrorAtPos(node, node.typeName.jsdocDotPos, 1, ts.Diagnostics.JSDoc_types_can_only_be_used_inside_documentation_comments);
             }
             var type = getTypeFromTypeReference(node);
             if (type !== errorType) {
                 if (node.typeArguments) {
+                    // Do type argument local checks only if referenced type is successfully resolved
                     ts.forEach(node.typeArguments, checkSourceElement);
                     if (produceDiagnostics) {
                         var typeParameters = getTypeParametersForTypeReference(node);
@@ -39817,7 +48772,7 @@ var ts;
                         }
                     }
                 }
-                if (type.flags & 32 && getNodeLinks(node).resolvedSymbol.flags & 8) {
+                if (type.flags & 32 /* Enum */ && getNodeLinks(node).resolvedSymbol.flags & 8 /* EnumMember */) {
                     error(node, ts.Diagnostics.Enum_type_0_has_members_with_initializers_that_are_not_literals, typeToString(type));
                 }
             }
@@ -39826,7 +48781,7 @@ var ts;
             var typeReferenceNode = ts.tryCast(node.parent, ts.isTypeReferenceType);
             if (!typeReferenceNode)
                 return undefined;
-            var typeParameters = getTypeParametersForTypeReference(typeReferenceNode);
+            var typeParameters = getTypeParametersForTypeReference(typeReferenceNode); // TODO: GH#18217
             var constraint = getConstraintOfTypeParameter(typeParameters[typeReferenceNode.typeArguments.indexOf(node)]);
             return constraint && instantiateType(constraint, createTypeMapper(typeParameters, getEffectiveTypeArguments(typeReferenceNode, typeParameters)));
         }
@@ -39846,6 +48801,7 @@ var ts;
             checkSourceElement(node.elementType);
         }
         function checkTupleType(node) {
+            // Grammar checking
             var hasErrorFromDisallowedTrailingComma = checkGrammarForDisallowedTrailingComma(node.elementTypes);
             if (!hasErrorFromDisallowedTrailingComma && node.elementTypes.length === 0) {
                 grammarErrorOnNode(node, ts.Diagnostics.A_tuple_type_element_list_cannot_be_empty);
@@ -39856,19 +48812,22 @@ var ts;
             ts.forEach(node.types, checkSourceElement);
         }
         function checkIndexedAccessIndexType(type, accessNode) {
-            if (!(type.flags & 2097152)) {
+            if (!(type.flags & 2097152 /* IndexedAccess */)) {
                 return type;
             }
+            // Check if the index type is assignable to 'keyof T' for the object type.
             var objectType = type.objectType;
             var indexType = type.indexType;
-            if (isTypeAssignableTo(indexType, getIndexType(objectType, false))) {
-                if (accessNode.kind === 186 && ts.isAssignmentTarget(accessNode) &&
-                    ts.getObjectFlags(objectType) & 32 && getMappedTypeModifiers(objectType) & 1) {
+            if (isTypeAssignableTo(indexType, getIndexType(objectType, /*stringsOnly*/ false))) {
+                if (accessNode.kind === 186 /* ElementAccessExpression */ && ts.isAssignmentTarget(accessNode) &&
+                    ts.getObjectFlags(objectType) & 32 /* Mapped */ && getMappedTypeModifiers(objectType) & 1 /* IncludeReadonly */) {
                     error(accessNode, ts.Diagnostics.Index_signature_in_type_0_only_permits_reading, typeToString(objectType));
                 }
                 return type;
             }
-            if (getIndexInfoOfType(getApparentType(objectType), 1) && isTypeAssignableToKind(indexType, 168)) {
+            // Check if we're indexing with a numeric type and if either object or index types
+            // is a generic type with a constraint that has a numeric index signature.
+            if (getIndexInfoOfType(getApparentType(objectType), 1 /* Number */) && isTypeAssignableToKind(indexType, 168 /* NumberLike */)) {
                 return type;
             }
             error(accessNode, ts.Diagnostics.Type_0_cannot_be_used_to_index_type_1, typeToString(indexType), typeToString(objectType));
@@ -39897,7 +48856,7 @@ var ts;
             ts.forEachChild(node, checkSourceElement);
         }
         function checkInferType(node) {
-            if (!ts.findAncestor(node, function (n) { return n.parent && n.parent.kind === 171 && n.parent.extendsType === n; })) {
+            if (!ts.findAncestor(node, function (n) { return n.parent && n.parent.kind === 171 /* ConditionalType */ && n.parent.extendsType === n; })) {
                 grammarErrorOnNode(node, ts.Diagnostics.infer_declarations_are_only_permitted_in_the_extends_clause_of_a_conditional_type);
             }
             checkSourceElement(node.typeParameter);
@@ -39907,18 +48866,21 @@ var ts;
             getTypeFromTypeNode(node);
         }
         function isPrivateWithinAmbient(node) {
-            return ts.hasModifier(node, 8) && !!(node.flags & 4194304);
+            return ts.hasModifier(node, 8 /* Private */) && !!(node.flags & 4194304 /* Ambient */);
         }
         function getEffectiveDeclarationFlags(n, flagsToCheck) {
             var flags = ts.getCombinedModifierFlags(n);
-            if (n.parent.kind !== 236 &&
-                n.parent.kind !== 235 &&
-                n.parent.kind !== 205 &&
-                n.flags & 4194304) {
-                if (!(flags & 2) && !(ts.isModuleBlock(n.parent) && ts.isModuleDeclaration(n.parent.parent) && ts.isGlobalScopeAugmentation(n.parent.parent))) {
-                    flags |= 1;
+            // children of classes (even ambient classes) should not be marked as ambient or export
+            // because those flags have no useful semantics there.
+            if (n.parent.kind !== 236 /* InterfaceDeclaration */ &&
+                n.parent.kind !== 235 /* ClassDeclaration */ &&
+                n.parent.kind !== 205 /* ClassExpression */ &&
+                n.flags & 4194304 /* Ambient */) {
+                if (!(flags & 2 /* Ambient */) && !(ts.isModuleBlock(n.parent) && ts.isModuleDeclaration(n.parent.parent) && ts.isGlobalScopeAugmentation(n.parent.parent))) {
+                    // It is nested in an ambient context, which means it is automatically exported
+                    flags |= 1 /* Export */;
                 }
-                flags |= 2;
+                flags |= 2 /* Ambient */;
             }
             return flags & flagsToCheck;
         }
@@ -39927,25 +48889,32 @@ var ts;
                 return;
             }
             function getCanonicalOverload(overloads, implementation) {
+                // Consider the canonical set of flags to be the flags of the bodyDeclaration or the first declaration
+                // Error on all deviations from this canonical set of flags
+                // The caveat is that if some overloads are defined in lib.d.ts, we don't want to
+                // report the errors on those. To achieve this, we will say that the implementation is
+                // the canonical signature only if it is in the same container as the first overload
                 var implementationSharesContainerWithFirstOverload = implementation !== undefined && implementation.parent === overloads[0].parent;
                 return implementationSharesContainerWithFirstOverload ? implementation : overloads[0];
             }
             function checkFlagAgreementBetweenOverloads(overloads, implementation, flagsToCheck, someOverloadFlags, allOverloadFlags) {
+                // Error if some overloads have a flag that is not shared by all overloads. To find the
+                // deviations, we XOR someOverloadFlags with allOverloadFlags
                 var someButNotAllOverloadFlags = someOverloadFlags ^ allOverloadFlags;
                 if (someButNotAllOverloadFlags !== 0) {
                     var canonicalFlags_1 = getEffectiveDeclarationFlags(getCanonicalOverload(overloads, implementation), flagsToCheck);
                     ts.forEach(overloads, function (o) {
                         var deviation = getEffectiveDeclarationFlags(o, flagsToCheck) ^ canonicalFlags_1;
-                        if (deviation & 1) {
+                        if (deviation & 1 /* Export */) {
                             error(ts.getNameOfDeclaration(o), ts.Diagnostics.Overload_signatures_must_all_be_exported_or_non_exported);
                         }
-                        else if (deviation & 2) {
+                        else if (deviation & 2 /* Ambient */) {
                             error(ts.getNameOfDeclaration(o), ts.Diagnostics.Overload_signatures_must_all_be_ambient_or_non_ambient);
                         }
-                        else if (deviation & (8 | 16)) {
+                        else if (deviation & (8 /* Private */ | 16 /* Protected */)) {
                             error(ts.getNameOfDeclaration(o) || o, ts.Diagnostics.Overload_signatures_must_all_be_public_private_or_protected);
                         }
-                        else if (deviation & 128) {
+                        else if (deviation & 128 /* Abstract */) {
                             error(ts.getNameOfDeclaration(o), ts.Diagnostics.Overload_signatures_must_all_be_abstract_or_non_abstract);
                         }
                     });
@@ -39962,8 +48931,8 @@ var ts;
                     });
                 }
             }
-            var flagsToCheck = 1 | 2 | 8 | 16 | 128;
-            var someNodeFlags = 0;
+            var flagsToCheck = 1 /* Export */ | 2 /* Ambient */ | 8 /* Private */ | 16 /* Protected */ | 128 /* Abstract */;
+            var someNodeFlags = 0 /* None */;
             var allNodeFlags = flagsToCheck;
             var someHaveQuestionToken = false;
             var allHaveQuestionToken = true;
@@ -39972,7 +48941,7 @@ var ts;
             var lastSeenNonAmbientDeclaration;
             var previousDeclaration;
             var declarations = symbol.declarations;
-            var isConstructor = (symbol.flags & 16384) !== 0;
+            var isConstructor = (symbol.flags & 16384 /* Constructor */) !== 0;
             function reportImplementationExpectedError(node) {
                 if (node.name && ts.nodeIsMissing(node.name)) {
                     return;
@@ -39986,17 +48955,24 @@ var ts;
                         seen = c === node;
                     }
                 });
+                // We may be here because of some extra nodes between overloads that could not be parsed into a valid node.
+                // In this case the subsequent node is not really consecutive (.pos !== node.end), and we must ignore it here.
                 if (subsequentNode && subsequentNode.pos === node.end) {
                     if (subsequentNode.kind === node.kind) {
                         var errorNode_1 = subsequentNode.name || subsequentNode;
+                        // TODO: GH#17345: These are methods, so handle computed name case. (`Always allowing computed property names is *not* the correct behavior!)
                         var subsequentName = subsequentNode.name;
                         if (node.name && subsequentName &&
                             (ts.isComputedPropertyName(node.name) && ts.isComputedPropertyName(subsequentName) ||
                                 !ts.isComputedPropertyName(node.name) && !ts.isComputedPropertyName(subsequentName) && ts.getEscapedTextOfIdentifierOrLiteral(node.name) === ts.getEscapedTextOfIdentifierOrLiteral(subsequentName))) {
-                            var reportError = (node.kind === 154 || node.kind === 153) &&
-                                ts.hasModifier(node, 32) !== ts.hasModifier(subsequentNode, 32);
+                            var reportError = (node.kind === 154 /* MethodDeclaration */ || node.kind === 153 /* MethodSignature */) &&
+                                ts.hasModifier(node, 32 /* Static */) !== ts.hasModifier(subsequentNode, 32 /* Static */);
+                            // we can get here in two cases
+                            // 1. mixed static and instance class members
+                            // 2. something with the same name was defined before the set of overloads that prevents them from merging
+                            // here we'll report error only for the first case since for second we should already report error in binder
                             if (reportError) {
-                                var diagnostic = ts.hasModifier(node, 32) ? ts.Diagnostics.Function_overload_must_be_static : ts.Diagnostics.Function_overload_must_not_be_static;
+                                var diagnostic = ts.hasModifier(node, 32 /* Static */) ? ts.Diagnostics.Function_overload_must_be_static : ts.Diagnostics.Function_overload_must_not_be_static;
                                 error(errorNode_1, diagnostic);
                             }
                             return;
@@ -40012,7 +48988,9 @@ var ts;
                     error(errorNode, ts.Diagnostics.Constructor_implementation_is_missing);
                 }
                 else {
-                    if (ts.hasModifier(node, 128)) {
+                    // Report different errors regarding non-consecutive blocks of declarations depending on whether
+                    // the node in question is abstract.
+                    if (ts.hasModifier(node, 128 /* Abstract */)) {
                         error(errorNode, ts.Diagnostics.All_declarations_of_an_abstract_method_must_be_consecutive);
                     }
                     else {
@@ -40022,15 +49000,22 @@ var ts;
             }
             var duplicateFunctionDeclaration = false;
             var multipleConstructorImplementation = false;
-            for (var _i = 0, declarations_4 = declarations; _i < declarations_4.length; _i++) {
-                var current = declarations_4[_i];
+            for (var _i = 0, declarations_3 = declarations; _i < declarations_3.length; _i++) {
+                var current = declarations_3[_i];
                 var node = current;
-                var inAmbientContext = node.flags & 4194304;
-                var inAmbientContextOrInterface = node.parent.kind === 236 || node.parent.kind === 166 || inAmbientContext;
+                var inAmbientContext = node.flags & 4194304 /* Ambient */;
+                var inAmbientContextOrInterface = node.parent.kind === 236 /* InterfaceDeclaration */ || node.parent.kind === 166 /* TypeLiteral */ || inAmbientContext;
                 if (inAmbientContextOrInterface) {
+                    // check if declarations are consecutive only if they are non-ambient
+                    // 1. ambient declarations can be interleaved
+                    // i.e. this is legal
+                    //     declare function foo();
+                    //     declare function bar();
+                    //     declare function foo();
+                    // 2. mixing ambient and non-ambient declarations is a separate error that will be reported - do not want to report an extra one
                     previousDeclaration = undefined;
                 }
-                if (node.kind === 234 || node.kind === 154 || node.kind === 153 || node.kind === 155) {
+                if (node.kind === 234 /* FunctionDeclaration */ || node.kind === 154 /* MethodDeclaration */ || node.kind === 153 /* MethodSignature */ || node.kind === 155 /* Constructor */) {
                     var currentNodeFlags = getEffectiveDeclarationFlags(node, flagsToCheck);
                     someNodeFlags |= currentNodeFlags;
                     allNodeFlags &= currentNodeFlags;
@@ -40071,8 +49056,9 @@ var ts;
                     error(ts.getNameOfDeclaration(declaration), ts.Diagnostics.Duplicate_function_implementation);
                 });
             }
+            // Abstract methods can't have an implementation -- in particular, they don't need one.
             if (lastSeenNonAmbientDeclaration && !lastSeenNonAmbientDeclaration.body &&
-                !ts.hasModifier(lastSeenNonAmbientDeclaration, 128) && !lastSeenNonAmbientDeclaration.questionToken) {
+                !ts.hasModifier(lastSeenNonAmbientDeclaration, 128 /* Abstract */) && !lastSeenNonAmbientDeclaration.questionToken) {
                 reportImplementationExpectedError(lastSeenNonAmbientDeclaration);
             }
             if (hasOverloads) {
@@ -40095,25 +49081,30 @@ var ts;
             if (!produceDiagnostics) {
                 return;
             }
+            // if localSymbol is defined on node then node itself is exported - check is required
             var symbol = node.localSymbol;
             if (!symbol) {
+                // local symbol is undefined => this declaration is non-exported.
+                // however symbol might contain other declarations that are exported
                 symbol = getSymbolOfNode(node);
                 if (!symbol.exportSymbol) {
+                    // this is a pure local symbol (all declarations are non-exported) - no need to check anything
                     return;
                 }
             }
+            // run the check only for the first declaration in the list
             if (ts.getDeclarationOfKind(symbol, node.kind) !== node) {
                 return;
             }
-            var exportedDeclarationSpaces = 0;
-            var nonExportedDeclarationSpaces = 0;
-            var defaultExportedDeclarationSpaces = 0;
+            var exportedDeclarationSpaces = 0 /* None */;
+            var nonExportedDeclarationSpaces = 0 /* None */;
+            var defaultExportedDeclarationSpaces = 0 /* None */;
             for (var _i = 0, _a = symbol.declarations; _i < _a.length; _i++) {
                 var d = _a[_i];
                 var declarationSpaces = getDeclarationSpaces(d);
-                var effectiveDeclarationFlags = getEffectiveDeclarationFlags(d, 1 | 512);
-                if (effectiveDeclarationFlags & 1) {
-                    if (effectiveDeclarationFlags & 512) {
+                var effectiveDeclarationFlags = getEffectiveDeclarationFlags(d, 1 /* Export */ | 512 /* Default */);
+                if (effectiveDeclarationFlags & 1 /* Export */) {
+                    if (effectiveDeclarationFlags & 512 /* Default */) {
                         defaultExportedDeclarationSpaces |= declarationSpaces;
                     }
                     else {
@@ -40124,14 +49115,17 @@ var ts;
                     nonExportedDeclarationSpaces |= declarationSpaces;
                 }
             }
+            // Spaces for anything not declared a 'default export'.
             var nonDefaultExportedDeclarationSpaces = exportedDeclarationSpaces | nonExportedDeclarationSpaces;
             var commonDeclarationSpacesForExportsAndLocals = exportedDeclarationSpaces & nonExportedDeclarationSpaces;
             var commonDeclarationSpacesForDefaultAndNonDefault = defaultExportedDeclarationSpaces & nonDefaultExportedDeclarationSpaces;
             if (commonDeclarationSpacesForExportsAndLocals || commonDeclarationSpacesForDefaultAndNonDefault) {
+                // declaration spaces for exported and non-exported declarations intersect
                 for (var _b = 0, _c = symbol.declarations; _b < _c.length; _b++) {
                     var d = _c[_b];
                     var declarationSpaces = getDeclarationSpaces(d);
                     var name = ts.getNameOfDeclaration(d);
+                    // Only error on the declarations that contributed to the intersecting spaces.
                     if (declarationSpaces & commonDeclarationSpacesForDefaultAndNonDefault) {
                         error(name, ts.Diagnostics.Merged_declaration_0_cannot_include_a_default_export_declaration_Consider_adding_a_separate_export_default_0_declaration_instead, ts.declarationNameToString(name));
                     }
@@ -40150,37 +49144,41 @@ var ts;
             function getDeclarationSpaces(decl) {
                 var d = decl;
                 switch (d.kind) {
-                    case 236:
-                    case 237:
-                    case 297:
-                    case 292:
-                        return 2;
-                    case 239:
-                        return ts.isAmbientModule(d) || ts.getModuleInstanceState(d) !== 0
-                            ? 4 | 1
-                            : 4;
-                    case 235:
-                    case 238:
-                        return 2 | 1;
-                    case 274:
-                        return 2 | 1 | 4;
-                    case 249:
+                    case 236 /* InterfaceDeclaration */:
+                    case 237 /* TypeAliasDeclaration */:
+                    // A jsdoc typedef and callback are, by definition, type aliases
+                    case 297 /* JSDocTypedefTag */:
+                    case 292 /* JSDocCallbackTag */:
+                        return 2 /* ExportType */;
+                    case 239 /* ModuleDeclaration */:
+                        return ts.isAmbientModule(d) || ts.getModuleInstanceState(d) !== 0 /* NonInstantiated */
+                            ? 4 /* ExportNamespace */ | 1 /* ExportValue */
+                            : 4 /* ExportNamespace */;
+                    case 235 /* ClassDeclaration */:
+                    case 238 /* EnumDeclaration */:
+                        return 2 /* ExportType */ | 1 /* ExportValue */;
+                    case 274 /* SourceFile */:
+                        return 2 /* ExportType */ | 1 /* ExportValue */ | 4 /* ExportNamespace */;
+                    case 249 /* ExportAssignment */:
+                        // Export assigned entity name expressions act as aliases and should fall through, otherwise they export values
                         if (!ts.isEntityNameExpression(d.expression)) {
-                            return 1;
+                            return 1 /* ExportValue */;
                         }
                         d = d.expression;
-                    case 243:
-                    case 246:
-                    case 245:
-                        var result_3 = 0;
+                    /* falls through */
+                    // The below options all declare an Alias, which is allowed to merge with other values within the importing module
+                    case 243 /* ImportEqualsDeclaration */:
+                    case 246 /* NamespaceImport */:
+                    case 245 /* ImportClause */:
+                        var result_2 = 0 /* None */;
                         var target = resolveAlias(getSymbolOfNode(d));
-                        ts.forEach(target.declarations, function (d) { result_3 |= getDeclarationSpaces(d); });
-                        return result_3;
-                    case 232:
-                    case 182:
-                    case 234:
-                    case 248:
-                        return 1;
+                        ts.forEach(target.declarations, function (d) { result_2 |= getDeclarationSpaces(d); });
+                        return result_2;
+                    case 232 /* VariableDeclaration */:
+                    case 182 /* BindingElement */:
+                    case 234 /* FunctionDeclaration */:
+                    case 248 /* ImportSpecifier */: // https://github.com/Microsoft/TypeScript/pull/7591
+                        return 1 /* ExportValue */;
                     default:
                         return ts.Debug.fail(ts.Debug.showSyntaxKind(d));
                 }
@@ -40190,7 +49188,21 @@ var ts;
             var promisedType = getPromisedTypeOfPromise(type, errorNode);
             return promisedType && getAwaitedType(promisedType, errorNode, diagnosticMessage);
         }
+        /**
+         * Gets the "promised type" of a promise.
+         * @param type The type of the promise.
+         * @remarks The "promised type" of a type is the type of the "value" parameter of the "onfulfilled" callback.
+         */
         function getPromisedTypeOfPromise(promise, errorNode) {
+            //
+            //  { // promise
+            //      then( // thenFunction
+            //          onfulfilled: ( // onfulfilledParameterType
+            //              value: T // valueParameterType
+            //          ) => any
+            //      ): any;
+            //  }
+            //
             if (isTypeAny(promise)) {
                 return undefined;
             }
@@ -40198,33 +49210,40 @@ var ts;
             if (typeAsPromise.promisedTypeOfPromise) {
                 return typeAsPromise.promisedTypeOfPromise;
             }
-            if (isReferenceToType(promise, getGlobalPromiseType(false))) {
+            if (isReferenceToType(promise, getGlobalPromiseType(/*reportErrors*/ false))) {
                 return typeAsPromise.promisedTypeOfPromise = promise.typeArguments[0];
             }
-            var thenFunction = getTypeOfPropertyOfType(promise, "then");
+            var thenFunction = getTypeOfPropertyOfType(promise, "then"); // TODO: GH#18217
             if (isTypeAny(thenFunction)) {
                 return undefined;
             }
-            var thenSignatures = thenFunction ? getSignaturesOfType(thenFunction, 0) : ts.emptyArray;
+            var thenSignatures = thenFunction ? getSignaturesOfType(thenFunction, 0 /* Call */) : ts.emptyArray;
             if (thenSignatures.length === 0) {
                 if (errorNode) {
                     error(errorNode, ts.Diagnostics.A_promise_must_have_a_then_method);
                 }
                 return undefined;
             }
-            var onfulfilledParameterType = getTypeWithFacts(getUnionType(ts.map(thenSignatures, getTypeOfFirstParameterOfSignature)), 524288);
+            var onfulfilledParameterType = getTypeWithFacts(getUnionType(ts.map(thenSignatures, getTypeOfFirstParameterOfSignature)), 524288 /* NEUndefinedOrNull */);
             if (isTypeAny(onfulfilledParameterType)) {
                 return undefined;
             }
-            var onfulfilledParameterSignatures = getSignaturesOfType(onfulfilledParameterType, 0);
+            var onfulfilledParameterSignatures = getSignaturesOfType(onfulfilledParameterType, 0 /* Call */);
             if (onfulfilledParameterSignatures.length === 0) {
                 if (errorNode) {
                     error(errorNode, ts.Diagnostics.The_first_parameter_of_the_then_method_of_a_promise_must_be_a_callback);
                 }
                 return undefined;
             }
-            return typeAsPromise.promisedTypeOfPromise = getUnionType(ts.map(onfulfilledParameterSignatures, getTypeOfFirstParameterOfSignature), 2);
+            return typeAsPromise.promisedTypeOfPromise = getUnionType(ts.map(onfulfilledParameterSignatures, getTypeOfFirstParameterOfSignature), 2 /* Subtype */);
         }
+        /**
+         * Gets the "awaited type" of a type.
+         * @param type The type to await.
+         * @remarks The "awaited type" of an expression is its "promised type" if the expression is a
+         * Promise-like type; otherwise, it is the type of the expression. This is used to reflect
+         * The runtime behavior of the `await` keyword.
+         */
         function checkAwaitedType(type, errorNode, diagnosticMessage) {
             return getAwaitedType(type, errorNode, diagnosticMessage) || errorType;
         }
@@ -40236,7 +49255,7 @@ var ts;
             if (isTypeAny(type)) {
                 return typeAsAwaitable.awaitedTypeOfType = type;
             }
-            if (type.flags & 262144) {
+            if (type.flags & 262144 /* Union */) {
                 var types = void 0;
                 for (var _i = 0, _a = type.types; _i < _a.length; _i++) {
                     var constituentType = _a[_i];
@@ -40250,11 +49269,45 @@ var ts;
             var promisedType = getPromisedTypeOfPromise(type);
             if (promisedType) {
                 if (type.id === promisedType.id || awaitedTypeStack.indexOf(promisedType.id) >= 0) {
+                    // Verify that we don't have a bad actor in the form of a promise whose
+                    // promised type is the same as the promise type, or a mutually recursive
+                    // promise. If so, we return undefined as we cannot guess the shape. If this
+                    // were the actual case in the JavaScript, this Promise would never resolve.
+                    //
+                    // An example of a bad actor with a singly-recursive promise type might
+                    // be:
+                    //
+                    //  interface BadPromise {
+                    //      then(
+                    //          onfulfilled: (value: BadPromise) => any,
+                    //          onrejected: (error: any) => any): BadPromise;
+                    //  }
+                    // The above interface will pass the PromiseLike check, and return a
+                    // promised type of `BadPromise`. Since this is a self reference, we
+                    // don't want to keep recursing ad infinitum.
+                    //
+                    // An example of a bad actor in the form of a mutually-recursive
+                    // promise type might be:
+                    //
+                    //  interface BadPromiseA {
+                    //      then(
+                    //          onfulfilled: (value: BadPromiseB) => any,
+                    //          onrejected: (error: any) => any): BadPromiseB;
+                    //  }
+                    //
+                    //  interface BadPromiseB {
+                    //      then(
+                    //          onfulfilled: (value: BadPromiseA) => any,
+                    //          onrejected: (error: any) => any): BadPromiseA;
+                    //  }
+                    //
                     if (errorNode) {
                         error(errorNode, ts.Diagnostics.Type_is_referenced_directly_or_indirectly_in_the_fulfillment_callback_of_its_own_then_method);
                     }
                     return undefined;
                 }
+                // Keep track of the type we're about to unwrap to avoid bad recursive promise types.
+                // See the comments above for more information.
                 awaitedTypeStack.push(type.id);
                 var awaitedType = getAwaitedType(promisedType, errorNode, diagnosticMessage);
                 awaitedTypeStack.pop();
@@ -40263,8 +49316,23 @@ var ts;
                 }
                 return typeAsAwaitable.awaitedTypeOfType = awaitedType;
             }
+            // The type was not a promise, so it could not be unwrapped any further.
+            // As long as the type does not have a callable "then" property, it is
+            // safe to return the type; otherwise, an error will be reported in
+            // the call to getNonThenableType and we will return undefined.
+            //
+            // An example of a non-promise "thenable" might be:
+            //
+            //  await { then(): void {} }
+            //
+            // The "thenable" does not match the minimal definition for a promise. When
+            // a Promise/A+-compatible or ES6 promise tries to adopt this value, the promise
+            // will never settle. We treat this as an error to help flag an early indicator
+            // of a runtime problem. If the user wants to return this value from an async
+            // function, they would need to wrap it in some other value. If they want it to
+            // be treated as a promise, they can cast to <any>.
             var thenFunction = getTypeOfPropertyOfType(type, "then");
-            if (thenFunction && getSignaturesOfType(thenFunction, 0).length > 0) {
+            if (thenFunction && getSignaturesOfType(thenFunction, 0 /* Call */).length > 0) {
                 if (errorNode) {
                     if (!diagnosticMessage)
                         return ts.Debug.fail();
@@ -40274,20 +49342,60 @@ var ts;
             }
             return typeAsAwaitable.awaitedTypeOfType = type;
         }
+        /**
+         * Checks the return type of an async function to ensure it is a compatible
+         * Promise implementation.
+         *
+         * This checks that an async function has a valid Promise-compatible return type,
+         * and returns the *awaited type* of the promise. An async function has a valid
+         * Promise-compatible return type if the resolved value of the return type has a
+         * construct signature that takes in an `initializer` function that in turn supplies
+         * a `resolve` function as one of its arguments and results in an object with a
+         * callable `then` signature.
+         *
+         * @param node The signature to check
+         */
         function checkAsyncFunctionReturnType(node) {
-            var returnTypeNode = ts.getEffectiveReturnTypeNode(node);
+            // As part of our emit for an async function, we will need to emit the entity name of
+            // the return type annotation as an expression. To meet the necessary runtime semantics
+            // for __awaiter, we must also check that the type of the declaration (e.g. the static
+            // side or "constructor" of the promise type) is compatible `PromiseConstructorLike`.
+            //
+            // An example might be (from lib.es6.d.ts):
+            //
+            //  interface Promise<T> { ... }
+            //  interface PromiseConstructor {
+            //      new <T>(...): Promise<T>;
+            //  }
+            //  declare var Promise: PromiseConstructor;
+            //
+            // When an async function declares a return type annotation of `Promise<T>`, we
+            // need to get the type of the `Promise` variable declaration above, which would
+            // be `PromiseConstructor`.
+            //
+            // The same case applies to a class:
+            //
+            //  declare class Promise<T> {
+            //      constructor(...);
+            //      then<U>(...): Promise<U>;
+            //  }
+            //
+            var returnTypeNode = ts.getEffectiveReturnTypeNode(node); // TODO: GH#18217
             var returnType = getTypeFromTypeNode(returnTypeNode);
-            if (languageVersion >= 2) {
+            if (languageVersion >= 2 /* ES2015 */) {
                 if (returnType === errorType) {
                     return errorType;
                 }
-                var globalPromiseType = getGlobalPromiseType(true);
+                var globalPromiseType = getGlobalPromiseType(/*reportErrors*/ true);
                 if (globalPromiseType !== emptyGenericType && !isReferenceToType(returnType, globalPromiseType)) {
+                    // The promise type was not a valid type reference to the global promise type, so we
+                    // report an error and return the unknown type.
                     error(returnTypeNode, ts.Diagnostics.The_return_type_of_an_async_function_or_method_must_be_the_global_Promise_T_type);
                     return errorType;
                 }
             }
             else {
+                // Always mark the type node as referenced if it points to a value
                 markTypeNodeAsReferenced(returnTypeNode);
                 if (returnType === errorType) {
                     return errorType;
@@ -40297,10 +49405,10 @@ var ts;
                     error(returnTypeNode, ts.Diagnostics.Type_0_is_not_a_valid_async_function_return_type_in_ES5_SlashES3_because_it_does_not_refer_to_a_Promise_compatible_constructor_value, typeToString(returnType));
                     return errorType;
                 }
-                var promiseConstructorSymbol = resolveEntityName(promiseConstructorName, 67216319, true);
+                var promiseConstructorSymbol = resolveEntityName(promiseConstructorName, 67216319 /* Value */, /*ignoreErrors*/ true);
                 var promiseConstructorType = promiseConstructorSymbol ? getTypeOfSymbol(promiseConstructorSymbol) : errorType;
                 if (promiseConstructorType === errorType) {
-                    if (promiseConstructorName.kind === 71 && promiseConstructorName.escapedText === "Promise" && getTargetType(returnType) === getGlobalPromiseType(false)) {
+                    if (promiseConstructorName.kind === 71 /* Identifier */ && promiseConstructorName.escapedText === "Promise" && getTargetType(returnType) === getGlobalPromiseType(/*reportErrors*/ false)) {
                         error(returnTypeNode, ts.Diagnostics.An_async_function_or_method_in_ES5_SlashES3_requires_the_Promise_constructor_Make_sure_you_have_a_declaration_for_the_Promise_constructor_or_include_ES2015_in_your_lib_option);
                     }
                     else {
@@ -40308,50 +49416,57 @@ var ts;
                     }
                     return errorType;
                 }
-                var globalPromiseConstructorLikeType = getGlobalPromiseConstructorLikeType(true);
+                var globalPromiseConstructorLikeType = getGlobalPromiseConstructorLikeType(/*reportErrors*/ true);
                 if (globalPromiseConstructorLikeType === emptyObjectType) {
+                    // If we couldn't resolve the global PromiseConstructorLike type we cannot verify
+                    // compatibility with __awaiter.
                     error(returnTypeNode, ts.Diagnostics.Type_0_is_not_a_valid_async_function_return_type_in_ES5_SlashES3_because_it_does_not_refer_to_a_Promise_compatible_constructor_value, ts.entityNameToString(promiseConstructorName));
                     return errorType;
                 }
                 if (!checkTypeAssignableTo(promiseConstructorType, globalPromiseConstructorLikeType, returnTypeNode, ts.Diagnostics.Type_0_is_not_a_valid_async_function_return_type_in_ES5_SlashES3_because_it_does_not_refer_to_a_Promise_compatible_constructor_value)) {
                     return errorType;
                 }
+                // Verify there is no local declaration that could collide with the promise constructor.
                 var rootName = promiseConstructorName && getFirstIdentifier(promiseConstructorName);
-                var collidingSymbol = getSymbol(node.locals, rootName.escapedText, 67216319);
+                var collidingSymbol = getSymbol(node.locals, rootName.escapedText, 67216319 /* Value */);
                 if (collidingSymbol) {
                     error(collidingSymbol.valueDeclaration, ts.Diagnostics.Duplicate_identifier_0_Compiler_uses_declaration_1_to_support_async_functions, ts.idText(rootName), ts.entityNameToString(promiseConstructorName));
                     return errorType;
                 }
             }
+            // Get and return the awaited type of the return type.
             return checkAwaitedType(returnType, node, ts.Diagnostics.The_return_type_of_an_async_function_must_either_be_a_valid_promise_or_must_not_contain_a_callable_then_member);
         }
+        /** Check a decorator */
         function checkDecorator(node) {
             var signature = getResolvedSignature(node);
             var returnType = getReturnTypeOfSignature(signature);
-            if (returnType.flags & 1) {
+            if (returnType.flags & 1 /* Any */) {
                 return;
             }
             var expectedReturnType;
             var headMessage = getDiagnosticHeadMessageForDecoratorResolution(node);
             var errorInfo;
             switch (node.parent.kind) {
-                case 235:
+                case 235 /* ClassDeclaration */:
                     var classSymbol = getSymbolOfNode(node.parent);
                     var classConstructorType = getTypeOfSymbol(classSymbol);
                     expectedReturnType = getUnionType([classConstructorType, voidType]);
                     break;
-                case 149:
+                case 149 /* Parameter */:
                     expectedReturnType = voidType;
-                    errorInfo = ts.chainDiagnosticMessages(undefined, ts.Diagnostics.The_return_type_of_a_parameter_decorator_function_must_be_either_void_or_any);
+                    errorInfo = ts.chainDiagnosticMessages(
+                    /*details*/ undefined, ts.Diagnostics.The_return_type_of_a_parameter_decorator_function_must_be_either_void_or_any);
                     break;
-                case 152:
+                case 152 /* PropertyDeclaration */:
                     expectedReturnType = voidType;
-                    errorInfo = ts.chainDiagnosticMessages(undefined, ts.Diagnostics.The_return_type_of_a_property_decorator_function_must_be_either_void_or_any);
+                    errorInfo = ts.chainDiagnosticMessages(
+                    /*details*/ undefined, ts.Diagnostics.The_return_type_of_a_property_decorator_function_must_be_either_void_or_any);
                     break;
-                case 154:
-                case 156:
-                case 157:
-                    var methodType = getTypeOfNode(node.parent);
+                case 154 /* MethodDeclaration */:
+                case 156 /* GetAccessor */:
+                case 157 /* SetAccessor */:
+                    var methodType = getTypeOfNode(node.parent); // TODO: GH#18217
                     var descriptorType = createTypedPropertyDescriptorType(methodType);
                     expectedReturnType = getUnionType([descriptorType, voidType]);
                     break;
@@ -40360,6 +49475,10 @@ var ts;
             }
             checkTypeAssignableTo(returnType, expectedReturnType, node, headMessage, function () { return errorInfo; });
         }
+        /**
+         * If a TypeNode can be resolved to a value symbol imported from an external module, it is
+         * marked as referenced to prevent import elision.
+         */
         function markTypeNodeAsReferenced(node) {
             markEntityNameOrEntityExpressionAsReference(node && ts.getEntityNameFromTypeNode(node));
         }
@@ -40367,15 +49486,22 @@ var ts;
             if (!typeName)
                 return;
             var rootName = getFirstIdentifier(typeName);
-            var meaning = (typeName.kind === 71 ? 67901928 : 1920) | 2097152;
-            var rootSymbol = resolveName(rootName, rootName.escapedText, meaning, undefined, undefined, true);
+            var meaning = (typeName.kind === 71 /* Identifier */ ? 67901928 /* Type */ : 1920 /* Namespace */) | 2097152 /* Alias */;
+            var rootSymbol = resolveName(rootName, rootName.escapedText, meaning, /*nameNotFoundMessage*/ undefined, /*nameArg*/ undefined, /*isRefernce*/ true);
             if (rootSymbol
-                && rootSymbol.flags & 2097152
+                && rootSymbol.flags & 2097152 /* Alias */
                 && symbolIsValue(rootSymbol)
                 && !isConstEnumOrConstEnumOnlyModule(resolveAlias(rootSymbol))) {
                 markAliasSymbolAsReferenced(rootSymbol);
             }
         }
+        /**
+         * This function marks the type used for metadata decorator as referenced if it is import
+         * from external module.
+         * This is different from markTypeNodeAsReferenced because it tries to simplify type nodes in
+         * union and intersection type
+         * @param node
+         */
         function markDecoratorMedataDataTypeNodeAsReferenced(node) {
             var entityName = getEntityNameForDecoratorMetadata(node);
             if (entityName && ts.isEntityName(entityName)) {
@@ -40385,25 +49511,32 @@ var ts;
         function getEntityNameForDecoratorMetadata(node) {
             if (node) {
                 switch (node.kind) {
-                    case 170:
-                    case 169:
+                    case 170 /* IntersectionType */:
+                    case 169 /* UnionType */:
                         var commonEntityName = void 0;
                         for (var _i = 0, _a = node.types; _i < _a.length; _i++) {
                             var typeNode = _a[_i];
-                            while (typeNode.kind === 173) {
-                                typeNode = typeNode.type;
+                            while (typeNode.kind === 173 /* ParenthesizedType */) {
+                                typeNode = typeNode.type; // Skip parens if need be
                             }
-                            if (typeNode.kind === 131) {
-                                continue;
+                            if (typeNode.kind === 131 /* NeverKeyword */) {
+                                continue; // Always elide `never` from the union/intersection if possible
                             }
-                            if (!strictNullChecks && (typeNode.kind === 95 || typeNode.kind === 140)) {
-                                continue;
+                            if (!strictNullChecks && (typeNode.kind === 95 /* NullKeyword */ || typeNode.kind === 140 /* UndefinedKeyword */)) {
+                                continue; // Elide null and undefined from unions for metadata, just like what we did prior to the implementation of strict null checks
                             }
                             var individualEntityName = getEntityNameForDecoratorMetadata(typeNode);
                             if (!individualEntityName) {
+                                // Individual is something like string number
+                                // So it would be serialized to either that type or object
+                                // Safe to return here
                                 return undefined;
                             }
                             if (commonEntityName) {
+                                // Note this is in sync with the transformation that happens for type node.
+                                // Keep this in sync with serializeUnionOrIntersectionType
+                                // Verify if they refer to same entity and is identifier
+                                // return undefined if they dont match because we would emit object
                                 if (!ts.isIdentifier(commonEntityName) ||
                                     !ts.isIdentifier(individualEntityName) ||
                                     commonEntityName.escapedText !== individualEntityName.escapedText) {
@@ -40415,9 +49548,9 @@ var ts;
                             }
                         }
                         return commonEntityName;
-                    case 173:
+                    case 173 /* ParenthesizedType */:
                         return getEntityNameForDecoratorMetadata(node.type);
-                    case 162:
+                    case 162 /* TypeReference */:
                         return node.typeName;
                 }
             }
@@ -40426,10 +49559,13 @@ var ts;
             var typeNode = ts.getEffectiveTypeAnnotationNode(node);
             return ts.isRestParameter(node) ? ts.getRestParameterElementType(typeNode) : typeNode;
         }
+        /** Check the decorators of a node */
         function checkDecorators(node) {
             if (!node.decorators) {
                 return;
             }
+            // skip this check for nodes that cannot have decorators. These should have already had an error reported by
+            // checkGrammarDecorators.
             if (!ts.nodeCanBeDecorated(node, node.parent, node.parent.parent)) {
                 return;
             }
@@ -40437,14 +49573,15 @@ var ts;
                 error(node, ts.Diagnostics.Experimental_support_for_decorators_is_a_feature_that_is_subject_to_change_in_a_future_release_Set_the_experimentalDecorators_option_to_remove_this_warning);
             }
             var firstDecorator = node.decorators[0];
-            checkExternalEmitHelpers(firstDecorator, 8);
-            if (node.kind === 149) {
-                checkExternalEmitHelpers(firstDecorator, 32);
+            checkExternalEmitHelpers(firstDecorator, 8 /* Decorate */);
+            if (node.kind === 149 /* Parameter */) {
+                checkExternalEmitHelpers(firstDecorator, 32 /* Param */);
             }
             if (compilerOptions.emitDecoratorMetadata) {
-                checkExternalEmitHelpers(firstDecorator, 16);
+                checkExternalEmitHelpers(firstDecorator, 16 /* Metadata */);
+                // we only need to perform these checks if we are emitting serialized type metadata for the target of a decorator.
                 switch (node.kind) {
-                    case 235:
+                    case 235 /* ClassDeclaration */:
                         var constructor = ts.getFirstConstructorWithBody(node);
                         if (constructor) {
                             for (var _i = 0, _a = constructor.parameters; _i < _a.length; _i++) {
@@ -40453,19 +49590,19 @@ var ts;
                             }
                         }
                         break;
-                    case 154:
-                    case 156:
-                    case 157:
+                    case 154 /* MethodDeclaration */:
+                    case 156 /* GetAccessor */:
+                    case 157 /* SetAccessor */:
                         for (var _b = 0, _c = node.parameters; _b < _c.length; _b++) {
                             var parameter = _c[_b];
                             markDecoratorMedataDataTypeNodeAsReferenced(getParameterTypeNodeForDecoratorCheck(parameter));
                         }
                         markDecoratorMedataDataTypeNodeAsReferenced(ts.getEffectiveReturnTypeNode(node));
                         break;
-                    case 152:
+                    case 152 /* PropertyDeclaration */:
                         markDecoratorMedataDataTypeNodeAsReferenced(ts.getEffectiveTypeAnnotationNode(node));
                         break;
-                    case 149:
+                    case 149 /* Parameter */:
                         markDecoratorMedataDataTypeNodeAsReferenced(getParameterTypeNodeForDecoratorCheck(node));
                         var containingSignature = node.parent;
                         for (var _d = 0, _e = containingSignature.parameters; _d < _e.length; _d++) {
@@ -40487,6 +49624,7 @@ var ts;
         }
         function checkJSDocTypeAliasTag(node) {
             if (!node.typeExpression) {
+                // If the node had `@property` tags, `typeExpression` would have been set to the first property tag.
                 error(node.name, ts.Diagnostics.JSDoc_typedef_tag_should_either_have_a_type_annotation_or_be_followed_by_property_or_member_tags);
             }
             if (node.name) {
@@ -40498,18 +49636,21 @@ var ts;
             checkSourceElement(node.typeExpression);
             if (!ts.getParameterSymbolFromJSDoc(node)) {
                 var decl = ts.getHostSignatureFromJSDoc(node);
+                // don't issue an error for invalid hosts -- just functions --
+                // and give a better error message when the host function mentions `arguments`
+                // but the tag doesn't have an array type
                 if (decl) {
                     var i = ts.getJSDocTags(decl).filter(ts.isJSDocParameterTag).indexOf(node);
                     if (i > -1 && i < decl.parameters.length && ts.isBindingPattern(decl.parameters[i].name)) {
                         return;
                     }
                     if (!containsArgumentsReference(decl)) {
-                        error(node.name, ts.Diagnostics.JSDoc_param_tag_has_name_0_but_there_is_no_parameter_with_that_name, ts.idText(node.name.kind === 146 ? node.name.right : node.name));
+                        error(node.name, ts.Diagnostics.JSDoc_param_tag_has_name_0_but_there_is_no_parameter_with_that_name, ts.idText(node.name.kind === 146 /* QualifiedName */ ? node.name.right : node.name));
                     }
                     else if (ts.findLast(ts.getJSDocTags(decl), ts.isJSDocParameterTag) === node &&
                         node.typeExpression && node.typeExpression.type &&
                         !isArrayType(getTypeFromTypeNode(node.typeExpression.type))) {
-                        error(node.name, ts.Diagnostics.JSDoc_param_tag_has_name_0_but_there_is_no_parameter_with_that_name_It_would_match_arguments_if_it_had_an_array_type, ts.idText(node.name.kind === 146 ? node.name.right : node.name));
+                        error(node.name, ts.Diagnostics.JSDoc_param_tag_has_name_0_but_there_is_no_parameter_with_that_name_It_would_match_arguments_if_it_had_an_array_type, ts.idText(node.name.kind === 146 /* QualifiedName */ ? node.name.right : node.name));
                     }
                 }
             }
@@ -40536,9 +49677,9 @@ var ts;
         }
         function getIdentifierFromEntityNameExpression(node) {
             switch (node.kind) {
-                case 71:
+                case 71 /* Identifier */:
                     return node;
-                case 185:
+                case 185 /* PropertyAccessExpression */:
                     return node.name;
                 default:
                     return undefined;
@@ -40548,41 +49689,63 @@ var ts;
             checkDecorators(node);
             checkSignatureDeclaration(node);
             var functionFlags = ts.getFunctionFlags(node);
-            if (node.name && node.name.kind === 147) {
+            // Do not use hasDynamicName here, because that returns false for well known symbols.
+            // We want to perform checkComputedPropertyName for all computed properties, including
+            // well known symbols.
+            if (node.name && node.name.kind === 147 /* ComputedPropertyName */) {
+                // This check will account for methods in class/interface declarations,
+                // as well as accessors in classes/object literals
                 checkComputedPropertyName(node.name);
             }
             if (!hasNonBindableDynamicName(node)) {
+                // first we want to check the local symbol that contain this declaration
+                // - if node.localSymbol !== undefined - this is current declaration is exported and localSymbol points to the local symbol
+                // - if node.localSymbol === undefined - this node is non-exported so we can just pick the result of getSymbolOfNode
                 var symbol = getSymbolOfNode(node);
                 var localSymbol = node.localSymbol || symbol;
-                var firstDeclaration = ts.find(localSymbol.declarations, function (declaration) { return declaration.kind === node.kind && !(declaration.flags & 65536); });
+                // Since the javascript won't do semantic analysis like typescript,
+                // if the javascript file comes before the typescript file and both contain same name functions,
+                // checkFunctionOrConstructorSymbol wouldn't be called if we didnt ignore javascript function.
+                var firstDeclaration = ts.find(localSymbol.declarations, 
+                // Get first non javascript function declaration
+                function (declaration) { return declaration.kind === node.kind && !(declaration.flags & 65536 /* JavaScriptFile */); });
+                // Only type check the symbol once
                 if (node === firstDeclaration) {
                     checkFunctionOrConstructorSymbol(localSymbol);
                 }
                 if (symbol.parent) {
+                    // run check once for the first declaration
                     if (ts.getDeclarationOfKind(symbol, node.kind) === node) {
+                        // run check on export symbol to check that modifiers agree across all exported declarations
                         checkFunctionOrConstructorSymbol(symbol);
                     }
                 }
             }
-            var body = node.kind === 153 ? undefined : node.body;
+            var body = node.kind === 153 /* MethodSignature */ ? undefined : node.body;
             checkSourceElement(body);
             var returnTypeNode = ts.getEffectiveReturnTypeNode(node);
-            if ((functionFlags & 1) === 0) {
-                var returnOrPromisedType = returnTypeNode && (functionFlags & 2
-                    ? checkAsyncFunctionReturnType(node)
-                    : getTypeFromTypeNode(returnTypeNode));
+            if ((functionFlags & 1 /* Generator */) === 0) { // Async function or normal function
+                var returnOrPromisedType = returnTypeNode && (functionFlags & 2 /* Async */
+                    ? checkAsyncFunctionReturnType(node) // Async function
+                    : getTypeFromTypeNode(returnTypeNode)); // normal function
                 checkAllCodePathsInNonVoidFunctionReturnOrThrow(node, returnOrPromisedType);
             }
             if (produceDiagnostics && !returnTypeNode) {
+                // Report an implicit any error if there is no body, no explicit return type, and node is not a private method
+                // in an ambient context
                 if (noImplicitAny && ts.nodeIsMissing(body) && !isPrivateWithinAmbient(node)) {
                     reportImplicitAnyError(node, anyType);
                 }
-                if (functionFlags & 1 && ts.nodeIsPresent(body)) {
+                if (functionFlags & 1 /* Generator */ && ts.nodeIsPresent(body)) {
+                    // A generator with a body and no type annotation can still cause errors. It can error if the
+                    // yielded values have no common supertype, or it can give an implicit any error if it has no
+                    // yielded values. The only way to trigger these errors is to try checking its return type.
                     getReturnTypeOfSignature(getSignatureFromDeclaration(node));
                 }
             }
         }
         function registerForUnusedIdentifiersCheck(node) {
+            // May be in a call such as getTypeOfNode that happened to call this. But potentiallyUnusedIdentifiers is only defined in the scope of `checkSourceFile`.
             if (produceDiagnostics) {
                 var sourceFile = ts.getSourceFileOfNode(node);
                 var potentiallyUnusedIdentifiers = allPotentiallyUnusedIdentifiers.get(sourceFile.path);
@@ -40590,6 +49753,8 @@ var ts;
                     potentiallyUnusedIdentifiers = [];
                     allPotentiallyUnusedIdentifiers.set(sourceFile.path, potentiallyUnusedIdentifiers);
                 }
+                // TODO: GH#22580
+                // Debug.assert(addToSeen(seenPotentiallyUnusedIdentifiers, getNodeId(node)), "Adding potentially-unused identifier twice");
                 potentiallyUnusedIdentifiers.push(node);
             }
         }
@@ -40597,41 +49762,41 @@ var ts;
             for (var _i = 0, potentiallyUnusedIdentifiers_1 = potentiallyUnusedIdentifiers; _i < potentiallyUnusedIdentifiers_1.length; _i++) {
                 var node = potentiallyUnusedIdentifiers_1[_i];
                 switch (node.kind) {
-                    case 235:
-                    case 205:
+                    case 235 /* ClassDeclaration */:
+                    case 205 /* ClassExpression */:
                         checkUnusedClassMembers(node, addDiagnostic);
                         checkUnusedTypeParameters(node, addDiagnostic);
                         break;
-                    case 236:
+                    case 236 /* InterfaceDeclaration */:
                         checkUnusedTypeParameters(node, addDiagnostic);
                         break;
-                    case 274:
-                    case 239:
-                    case 213:
-                    case 241:
-                    case 220:
-                    case 221:
-                    case 222:
+                    case 274 /* SourceFile */:
+                    case 239 /* ModuleDeclaration */:
+                    case 213 /* Block */:
+                    case 241 /* CaseBlock */:
+                    case 220 /* ForStatement */:
+                    case 221 /* ForInStatement */:
+                    case 222 /* ForOfStatement */:
                         checkUnusedLocalsAndParameters(node, addDiagnostic);
                         break;
-                    case 155:
-                    case 192:
-                    case 234:
-                    case 193:
-                    case 154:
-                    case 156:
-                    case 157:
+                    case 155 /* Constructor */:
+                    case 192 /* FunctionExpression */:
+                    case 234 /* FunctionDeclaration */:
+                    case 193 /* ArrowFunction */:
+                    case 154 /* MethodDeclaration */:
+                    case 156 /* GetAccessor */:
+                    case 157 /* SetAccessor */:
                         if (node.body) {
                             checkUnusedLocalsAndParameters(node, addDiagnostic);
                         }
                         checkUnusedTypeParameters(node, addDiagnostic);
                         break;
-                    case 153:
-                    case 158:
-                    case 159:
-                    case 163:
-                    case 164:
-                    case 237:
+                    case 153 /* MethodSignature */:
+                    case 158 /* CallSignature */:
+                    case 159 /* ConstructSignature */:
+                    case 163 /* FunctionType */:
+                    case 164 /* ConstructorType */:
+                    case 237 /* TypeAliasDeclaration */:
                         checkUnusedTypeParameters(node, addDiagnostic);
                         break;
                     default:
@@ -40642,41 +49807,43 @@ var ts;
         function errorUnusedLocal(declaration, name, addDiagnostic) {
             var node = ts.getNameOfDeclaration(declaration) || declaration;
             var message = isTypeDeclaration(declaration) ? ts.Diagnostics._0_is_declared_but_never_used : ts.Diagnostics._0_is_declared_but_its_value_is_never_read;
-            addDiagnostic(0, ts.createDiagnosticForNode(node, message, name));
+            addDiagnostic(0 /* Local */, ts.createDiagnosticForNode(node, message, name));
         }
         function parameterNameStartsWithUnderscore(parameterName) {
             return parameterName && isIdentifierThatStartsWithUnderScore(parameterName);
         }
         function isIdentifierThatStartsWithUnderScore(node) {
-            return ts.isIdentifier(node) && ts.idText(node).charCodeAt(0) === 95;
+            return ts.isIdentifier(node) && ts.idText(node).charCodeAt(0) === 95 /* _ */;
         }
         function checkUnusedClassMembers(node, addDiagnostic) {
-            if (!(node.flags & 4194304)) {
+            if (!(node.flags & 4194304 /* Ambient */)) {
                 for (var _i = 0, _a = node.members; _i < _a.length; _i++) {
                     var member = _a[_i];
                     switch (member.kind) {
-                        case 154:
-                        case 152:
-                        case 156:
-                        case 157:
-                            if (member.kind === 157 && member.symbol.flags & 32768) {
+                        case 154 /* MethodDeclaration */:
+                        case 152 /* PropertyDeclaration */:
+                        case 156 /* GetAccessor */:
+                        case 157 /* SetAccessor */:
+                            if (member.kind === 157 /* SetAccessor */ && member.symbol.flags & 32768 /* GetAccessor */) {
+                                // Already would have reported an error on the getter.
                                 break;
                             }
                             var symbol = getSymbolOfNode(member);
-                            if (!symbol.isReferenced && ts.hasModifier(member, 8)) {
-                                addDiagnostic(0, ts.createDiagnosticForNode(member.name, ts.Diagnostics._0_is_declared_but_its_value_is_never_read, symbolToString(symbol)));
+                            if (!symbol.isReferenced && ts.hasModifier(member, 8 /* Private */)) {
+                                addDiagnostic(0 /* Local */, ts.createDiagnosticForNode(member.name, ts.Diagnostics._0_is_declared_but_its_value_is_never_read, symbolToString(symbol)));
                             }
                             break;
-                        case 155:
+                        case 155 /* Constructor */:
                             for (var _b = 0, _c = member.parameters; _b < _c.length; _b++) {
                                 var parameter = _c[_b];
-                                if (!parameter.symbol.isReferenced && ts.hasModifier(parameter, 8)) {
-                                    addDiagnostic(0, ts.createDiagnosticForNode(parameter.name, ts.Diagnostics.Property_0_is_declared_but_its_value_is_never_read, ts.symbolName(parameter.symbol)));
+                                if (!parameter.symbol.isReferenced && ts.hasModifier(parameter, 8 /* Private */)) {
+                                    addDiagnostic(0 /* Local */, ts.createDiagnosticForNode(parameter.name, ts.Diagnostics.Property_0_is_declared_but_its_value_is_never_read, ts.symbolName(parameter.symbol)));
                                 }
                             }
                             break;
-                        case 160:
-                        case 212:
+                        case 160 /* IndexSignature */:
+                        case 212 /* SemicolonClassElement */:
+                            // Can't be private
                             break;
                         default:
                             ts.Debug.fail();
@@ -40685,12 +49852,14 @@ var ts;
             }
         }
         function checkUnusedTypeParameters(node, addDiagnostic) {
+            // Only report errors on the last declaration for the type parameter container;
+            // this ensures that all uses have been accounted for.
             var typeParameters = ts.getEffectiveTypeParameterDeclarations(node);
-            if (!(node.flags & 4194304) && ts.last(getSymbolOfNode(node).declarations) === node) {
+            if (!(node.flags & 4194304 /* Ambient */) && ts.last(getSymbolOfNode(node).declarations) === node) {
                 for (var _i = 0, typeParameters_2 = typeParameters; _i < typeParameters_2.length; _i++) {
                     var typeParameter = typeParameters_2[_i];
-                    if (!(getMergedSymbol(typeParameter.symbol).isReferenced & 262144) && !isIdentifierThatStartsWithUnderScore(typeParameter.name)) {
-                        addDiagnostic(1, ts.createDiagnosticForNode(typeParameter.name, ts.Diagnostics._0_is_declared_but_its_value_is_never_read, ts.symbolName(typeParameter.symbol)));
+                    if (!(getMergedSymbol(typeParameter.symbol).isReferenced & 262144 /* TypeParameter */) && !isIdentifierThatStartsWithUnderScore(typeParameter.name)) {
+                        addDiagnostic(1 /* Parameter */, ts.createDiagnosticForNode(typeParameter.name, ts.Diagnostics._0_is_declared_but_its_value_is_never_read, ts.symbolName(typeParameter.symbol)));
                     }
                 }
             }
@@ -40709,13 +49878,16 @@ var ts;
             return ts.tryCast(ts.getRootDeclaration(node), ts.isParameter);
         }
         function checkUnusedLocalsAndParameters(nodeWithLocals, addDiagnostic) {
-            if (nodeWithLocals.flags & 4194304)
+            if (nodeWithLocals.flags & 4194304 /* Ambient */)
                 return;
+            // Ideally we could use the ImportClause directly as a key, but must wait until we have full ES6 maps. So must store key along with value.
             var unusedImports = ts.createMap();
             var unusedDestructures = ts.createMap();
             var unusedVariables = ts.createMap();
             nodeWithLocals.locals.forEach(function (local) {
-                if (local.flags & 262144 ? !(local.flags & 3 && !(local.isReferenced & 3)) : local.isReferenced || local.exportSymbol) {
+                // If it's purely a type parameter, ignore, will be checked in `checkUnusedTypeParameters`.
+                // If it's a type parameter merged with a parameter, check if the parameter-side is used.
+                if (local.flags & 262144 /* TypeParameter */ ? !(local.flags & 3 /* Variable */ && !(local.isReferenced & 3 /* Variable */)) : local.isReferenced || local.exportSymbol) {
                     return;
                 }
                 for (var _i = 0, _a = local.declarations; _i < _a.length; _i++) {
@@ -40726,6 +49898,7 @@ var ts;
                         addToGroup(unusedImports, importClauseFromImported(declaration), declaration, getNodeId);
                     }
                     else if (ts.isBindingElement(declaration) && ts.isObjectBindingPattern(declaration.parent)) {
+                        // In `{ a, ...b }, `a` is considered used since it removes a property from `b`. `b` may still be unused though.
                         var lastElement = ts.last(declaration.parent.elements);
                         if (declaration === lastElement || !ts.last(declaration.parent.elements).dotDotDotToken) {
                             addToGroup(unusedDestructures, declaration.parent, declaration, getNodeId);
@@ -40741,7 +49914,7 @@ var ts;
                         if (parameter) {
                             var name = ts.getNameOfDeclaration(local.valueDeclaration);
                             if (!ts.isParameterPropertyDeclaration(parameter) && !ts.parameterIsThisKeyword(parameter) && !parameterNameStartsWithUnderscore(name)) {
-                                addDiagnostic(1, ts.createDiagnosticForNode(name, ts.Diagnostics._0_is_declared_but_its_value_is_never_read, ts.symbolName(local)));
+                                addDiagnostic(1 /* Parameter */, ts.createDiagnosticForNode(name, ts.Diagnostics._0_is_declared_but_its_value_is_never_read, ts.symbolName(local)));
                             }
                         }
                         else {
@@ -40755,10 +49928,10 @@ var ts;
                 var importDecl = importClause.parent;
                 var nDeclarations = (importClause.name ? 1 : 0) +
                     (importClause.namedBindings ?
-                        (importClause.namedBindings.kind === 246 ? 1 : importClause.namedBindings.elements.length)
+                        (importClause.namedBindings.kind === 246 /* NamespaceImport */ ? 1 : importClause.namedBindings.elements.length)
                         : 0);
                 if (nDeclarations === unuseds.length) {
-                    addDiagnostic(0, unuseds.length === 1
+                    addDiagnostic(0 /* Local */, unuseds.length === 1
                         ? ts.createDiagnosticForNode(importDecl, ts.Diagnostics._0_is_declared_but_its_value_is_never_read, ts.idText(ts.first(unuseds).name))
                         : ts.createDiagnosticForNode(importDecl, ts.Diagnostics.All_imports_in_import_declaration_are_unused));
                 }
@@ -40771,9 +49944,9 @@ var ts;
             });
             unusedDestructures.forEach(function (_a) {
                 var bindingPattern = _a[0], bindingElements = _a[1];
-                var kind = tryGetRootParameterDeclaration(bindingPattern.parent) ? 1 : 0;
+                var kind = tryGetRootParameterDeclaration(bindingPattern.parent) ? 1 /* Parameter */ : 0 /* Local */;
                 if (bindingPattern.elements.length === bindingElements.length) {
-                    if (bindingElements.length === 1 && bindingPattern.parent.kind === 232 && bindingPattern.parent.parent.kind === 233) {
+                    if (bindingElements.length === 1 && bindingPattern.parent.kind === 232 /* VariableDeclaration */ && bindingPattern.parent.parent.kind === 233 /* VariableDeclarationList */) {
                         addToGroup(unusedVariables, bindingPattern.parent.parent, bindingPattern.parent, getNodeId);
                     }
                     else {
@@ -40792,37 +49965,38 @@ var ts;
             unusedVariables.forEach(function (_a) {
                 var declarationList = _a[0], declarations = _a[1];
                 if (declarationList.declarations.length === declarations.length) {
-                    addDiagnostic(0, declarations.length === 1
+                    addDiagnostic(0 /* Local */, declarations.length === 1
                         ? ts.createDiagnosticForNode(ts.first(declarations).name, ts.Diagnostics._0_is_declared_but_its_value_is_never_read, bindingNameText(ts.first(declarations).name))
-                        : ts.createDiagnosticForNode(declarationList.parent.kind === 214 ? declarationList.parent : declarationList, ts.Diagnostics.All_variables_are_unused));
+                        : ts.createDiagnosticForNode(declarationList.parent.kind === 214 /* VariableStatement */ ? declarationList.parent : declarationList, ts.Diagnostics.All_variables_are_unused));
                 }
                 else {
-                    for (var _i = 0, declarations_5 = declarations; _i < declarations_5.length; _i++) {
-                        var decl = declarations_5[_i];
-                        addDiagnostic(0, ts.createDiagnosticForNode(decl, ts.Diagnostics._0_is_declared_but_its_value_is_never_read, ts.idText(ts.cast(decl.name, ts.isIdentifier))));
+                    for (var _i = 0, declarations_4 = declarations; _i < declarations_4.length; _i++) {
+                        var decl = declarations_4[_i];
+                        addDiagnostic(0 /* Local */, ts.createDiagnosticForNode(decl, ts.Diagnostics._0_is_declared_but_its_value_is_never_read, ts.idText(ts.cast(decl.name, ts.isIdentifier))));
                     }
                 }
             });
         }
         function bindingNameText(name) {
             switch (name.kind) {
-                case 71:
+                case 71 /* Identifier */:
                     return ts.idText(name);
-                case 181:
-                case 180:
+                case 181 /* ArrayBindingPattern */:
+                case 180 /* ObjectBindingPattern */:
                     return bindingNameText(ts.cast(ts.first(name.elements), ts.isBindingElement).name);
                 default:
                     return ts.Debug.assertNever(name);
             }
         }
         function isImportedDeclaration(node) {
-            return node.kind === 245 || node.kind === 248 || node.kind === 246;
+            return node.kind === 245 /* ImportClause */ || node.kind === 248 /* ImportSpecifier */ || node.kind === 246 /* NamespaceImport */;
         }
         function importClauseFromImported(decl) {
-            return decl.kind === 245 ? decl : decl.kind === 246 ? decl.parent : decl.parent.parent;
+            return decl.kind === 245 /* ImportClause */ ? decl : decl.kind === 246 /* NamespaceImport */ ? decl.parent : decl.parent.parent;
         }
         function checkBlock(node) {
-            if (node.kind === 213) {
+            // Grammar checking for SyntaxKind.Block
+            if (node.kind === 213 /* Block */) {
                 checkGrammarStatementInAmbientContext(node);
             }
             if (ts.isFunctionOrModuleBlock(node)) {
@@ -40838,7 +50012,8 @@ var ts;
             }
         }
         function checkCollisionWithArgumentsInGeneratedCode(node) {
-            if (languageVersion >= 2 || compilerOptions.noEmit || !ts.hasRestParameter(node) || node.flags & 4194304 || ts.nodeIsMissing(node.body)) {
+            // no rest parameters \ declaration context \ overload - no codegen impact
+            if (languageVersion >= 2 /* ES2015 */ || compilerOptions.noEmit || !ts.hasRestParameter(node) || node.flags & 4194304 /* Ambient */ || ts.nodeIsMissing(node.body)) {
                 return;
             }
             ts.forEach(node.parameters, function (p) {
@@ -40851,27 +50026,31 @@ var ts;
             if (!(identifier && identifier.escapedText === name)) {
                 return false;
             }
-            if (node.kind === 152 ||
-                node.kind === 151 ||
-                node.kind === 154 ||
-                node.kind === 153 ||
-                node.kind === 156 ||
-                node.kind === 157) {
+            if (node.kind === 152 /* PropertyDeclaration */ ||
+                node.kind === 151 /* PropertySignature */ ||
+                node.kind === 154 /* MethodDeclaration */ ||
+                node.kind === 153 /* MethodSignature */ ||
+                node.kind === 156 /* GetAccessor */ ||
+                node.kind === 157 /* SetAccessor */) {
+                // it is ok to have member named '_super' or '_this' - member access is always qualified
                 return false;
             }
-            if (node.flags & 4194304) {
+            if (node.flags & 4194304 /* Ambient */) {
+                // ambient context - no codegen impact
                 return false;
             }
             var root = ts.getRootDeclaration(node);
-            if (root.kind === 149 && ts.nodeIsMissing(root.parent.body)) {
+            if (root.kind === 149 /* Parameter */ && ts.nodeIsMissing(root.parent.body)) {
+                // just an overload - no codegen impact
                 return false;
             }
             return true;
         }
+        // this function will run after checking the source file so 'CaptureThis' is correct for all nodes
         function checkIfThisIsCapturedInEnclosingScope(node) {
             ts.findAncestor(node, function (current) {
-                if (getNodeCheckFlags(current) & 4) {
-                    var isDeclaration_1 = node.kind !== 71;
+                if (getNodeCheckFlags(current) & 4 /* CaptureThis */) {
+                    var isDeclaration_1 = node.kind !== 71 /* Identifier */;
                     if (isDeclaration_1) {
                         error(ts.getNameOfDeclaration(node), ts.Diagnostics.Duplicate_identifier_this_Compiler_uses_variable_declaration_this_to_capture_this_reference);
                     }
@@ -40885,8 +50064,8 @@ var ts;
         }
         function checkIfNewTargetIsCapturedInEnclosingScope(node) {
             ts.findAncestor(node, function (current) {
-                if (getNodeCheckFlags(current) & 8) {
-                    var isDeclaration_2 = node.kind !== 71;
+                if (getNodeCheckFlags(current) & 8 /* CaptureNewTarget */) {
+                    var isDeclaration_2 = node.kind !== 71 /* Identifier */;
                     if (isDeclaration_2) {
                         error(ts.getNameOfDeclaration(node), ts.Diagnostics.Duplicate_identifier_newTarget_Compiler_uses_variable_declaration_newTarget_to_capture_new_target_meta_property_reference);
                     }
@@ -40899,57 +50078,96 @@ var ts;
             });
         }
         function checkCollisionWithRequireExportsInGeneratedCode(node, name) {
+            // No need to check for require or exports for ES6 modules and later
             if (moduleKind >= ts.ModuleKind.ES2015 || compilerOptions.noEmit) {
                 return;
             }
             if (!needCollisionCheckForIdentifier(node, name, "require") && !needCollisionCheckForIdentifier(node, name, "exports")) {
                 return;
             }
-            if (ts.isModuleDeclaration(node) && ts.getModuleInstanceState(node) !== 1) {
+            // Uninstantiated modules shouldnt do this check
+            if (ts.isModuleDeclaration(node) && ts.getModuleInstanceState(node) !== 1 /* Instantiated */) {
                 return;
             }
+            // In case of variable declaration, node.parent is variable statement so look at the variable statement's parent
             var parent = getDeclarationContainer(node);
-            if (parent.kind === 274 && ts.isExternalOrCommonJsModule(parent)) {
+            if (parent.kind === 274 /* SourceFile */ && ts.isExternalOrCommonJsModule(parent)) {
+                // If the declaration happens to be in external module, report error that require and exports are reserved keywords
                 error(name, ts.Diagnostics.Duplicate_identifier_0_Compiler_reserves_name_1_in_top_level_scope_of_a_module, ts.declarationNameToString(name), ts.declarationNameToString(name));
             }
         }
         function checkCollisionWithGlobalPromiseInGeneratedCode(node, name) {
-            if (languageVersion >= 4 || compilerOptions.noEmit || !needCollisionCheckForIdentifier(node, name, "Promise")) {
+            if (languageVersion >= 4 /* ES2017 */ || compilerOptions.noEmit || !needCollisionCheckForIdentifier(node, name, "Promise")) {
                 return;
             }
-            if (ts.isModuleDeclaration(node) && ts.getModuleInstanceState(node) !== 1) {
+            // Uninstantiated modules shouldnt do this check
+            if (ts.isModuleDeclaration(node) && ts.getModuleInstanceState(node) !== 1 /* Instantiated */) {
                 return;
             }
+            // In case of variable declaration, node.parent is variable statement so look at the variable statement's parent
             var parent = getDeclarationContainer(node);
-            if (parent.kind === 274 && ts.isExternalOrCommonJsModule(parent) && parent.flags & 1024) {
+            if (parent.kind === 274 /* SourceFile */ && ts.isExternalOrCommonJsModule(parent) && parent.flags & 1024 /* HasAsyncFunctions */) {
+                // If the declaration happens to be in external module, report error that Promise is a reserved identifier.
                 error(name, ts.Diagnostics.Duplicate_identifier_0_Compiler_reserves_name_1_in_top_level_scope_of_a_module_containing_async_functions, ts.declarationNameToString(name), ts.declarationNameToString(name));
             }
         }
         function checkVarDeclaredNamesNotShadowed(node) {
-            if ((ts.getCombinedNodeFlags(node) & 3) !== 0 || ts.isParameterDeclaration(node)) {
+            // - ScriptBody : StatementList
+            // It is a Syntax Error if any element of the LexicallyDeclaredNames of StatementList
+            // also occurs in the VarDeclaredNames of StatementList.
+            // - Block : { StatementList }
+            // It is a Syntax Error if any element of the LexicallyDeclaredNames of StatementList
+            // also occurs in the VarDeclaredNames of StatementList.
+            // Variable declarations are hoisted to the top of their function scope. They can shadow
+            // block scoped declarations, which bind tighter. this will not be flagged as duplicate definition
+            // by the binder as the declaration scope is different.
+            // A non-initialized declaration is a no-op as the block declaration will resolve before the var
+            // declaration. the problem is if the declaration has an initializer. this will act as a write to the
+            // block declared value. this is fine for let, but not const.
+            // Only consider declarations with initializers, uninitialized const declarations will not
+            // step on a let/const variable.
+            // Do not consider const and const declarations, as duplicate block-scoped declarations
+            // are handled by the binder.
+            // We are only looking for const declarations that step on let\const declarations from a
+            // different scope. e.g.:
+            //      {
+            //          const x = 0; // localDeclarationSymbol obtained after name resolution will correspond to this declaration
+            //          const x = 0; // symbol for this declaration will be 'symbol'
+            //      }
+            // skip block-scoped variables and parameters
+            if ((ts.getCombinedNodeFlags(node) & 3 /* BlockScoped */) !== 0 || ts.isParameterDeclaration(node)) {
                 return;
             }
-            if (node.kind === 232 && !node.initializer) {
+            // skip variable declarations that don't have initializers
+            // NOTE: in ES6 spec initializer is required in variable declarations where name is binding pattern
+            // so we'll always treat binding elements as initialized
+            if (node.kind === 232 /* VariableDeclaration */ && !node.initializer) {
                 return;
             }
             var symbol = getSymbolOfNode(node);
-            if (symbol.flags & 1) {
+            if (symbol.flags & 1 /* FunctionScopedVariable */) {
                 if (!ts.isIdentifier(node.name))
                     return ts.Debug.fail();
-                var localDeclarationSymbol = resolveName(node, node.name.escapedText, 3, undefined, undefined, false);
+                var localDeclarationSymbol = resolveName(node, node.name.escapedText, 3 /* Variable */, /*nodeNotFoundErrorMessage*/ undefined, /*nameArg*/ undefined, /*isUse*/ false);
                 if (localDeclarationSymbol &&
                     localDeclarationSymbol !== symbol &&
-                    localDeclarationSymbol.flags & 2) {
-                    if (getDeclarationNodeFlagsFromSymbol(localDeclarationSymbol) & 3) {
-                        var varDeclList = ts.getAncestor(localDeclarationSymbol.valueDeclaration, 233);
-                        var container = varDeclList.parent.kind === 214 && varDeclList.parent.parent
+                    localDeclarationSymbol.flags & 2 /* BlockScopedVariable */) {
+                    if (getDeclarationNodeFlagsFromSymbol(localDeclarationSymbol) & 3 /* BlockScoped */) {
+                        var varDeclList = ts.getAncestor(localDeclarationSymbol.valueDeclaration, 233 /* VariableDeclarationList */);
+                        var container = varDeclList.parent.kind === 214 /* VariableStatement */ && varDeclList.parent.parent
                             ? varDeclList.parent.parent
                             : undefined;
+                        // names of block-scoped and function scoped variables can collide only
+                        // if block scoped variable is defined in the function\module\source file scope (because of variable hoisting)
                         var namesShareScope = container &&
-                            (container.kind === 213 && ts.isFunctionLike(container.parent) ||
-                                container.kind === 240 ||
-                                container.kind === 239 ||
-                                container.kind === 274);
+                            (container.kind === 213 /* Block */ && ts.isFunctionLike(container.parent) ||
+                                container.kind === 240 /* ModuleBlock */ ||
+                                container.kind === 239 /* ModuleDeclaration */ ||
+                                container.kind === 274 /* SourceFile */);
+                        // here we know that function scoped variable is shadowed by block scoped one
+                        // if they are defined in the same scope - binder has already reported redeclaration error
+                        // otherwise if variable has an initializer - show error that initialization will fail
+                        // since LHS will be block scoped name instead of function scoped
                         if (!namesShareScope) {
                             var name = symbolToString(localDeclarationSymbol);
                             error(node, ts.Diagnostics.Cannot_initialize_outer_scoped_variable_0_in_the_same_scope_as_block_scoped_declaration_1, name, name);
@@ -40958,21 +50176,27 @@ var ts;
                 }
             }
         }
+        // Check that a parameter initializer contains no references to parameters declared to the right of itself
         function checkParameterInitializer(node) {
-            if (ts.getRootDeclaration(node).kind !== 149) {
+            if (ts.getRootDeclaration(node).kind !== 149 /* Parameter */) {
                 return;
             }
             var func = ts.getContainingFunction(node);
             visit(node.initializer);
             function visit(n) {
                 if (ts.isTypeNode(n) || ts.isDeclarationName(n)) {
+                    // do not dive in types
+                    // skip declaration names (i.e. in object literal expressions)
                     return;
                 }
-                if (n.kind === 185) {
+                if (n.kind === 185 /* PropertyAccessExpression */) {
+                    // skip property names in property access expression
                     return visit(n.expression);
                 }
-                else if (n.kind === 71) {
-                    var symbol = resolveName(n, n.escapedText, 67216319 | 2097152, undefined, undefined, false);
+                else if (n.kind === 71 /* Identifier */) {
+                    // check FunctionLikeDeclaration.locals (stores parameters\function local variable)
+                    // if it contains entry with a specified name
+                    var symbol = resolveName(n, n.escapedText, 67216319 /* Value */ | 2097152 /* Alias */, /*nameNotFoundMessage*/ undefined, /*nameArg*/ undefined, /*isUse*/ false);
                     if (!symbol || symbol === unknownSymbol || !symbol.valueDeclaration) {
                         return;
                     }
@@ -40980,24 +50204,32 @@ var ts;
                         error(n, ts.Diagnostics.Parameter_0_cannot_be_referenced_in_its_initializer, ts.declarationNameToString(node.name));
                         return;
                     }
+                    // locals map for function contain both parameters and function locals
+                    // so we need to do a bit of extra work to check if reference is legal
                     var enclosingContainer = ts.getEnclosingBlockScopeContainer(symbol.valueDeclaration);
                     if (enclosingContainer === func) {
-                        if (symbol.valueDeclaration.kind === 149 ||
-                            symbol.valueDeclaration.kind === 182) {
+                        if (symbol.valueDeclaration.kind === 149 /* Parameter */ ||
+                            symbol.valueDeclaration.kind === 182 /* BindingElement */) {
+                            // it is ok to reference parameter in initializer if either
+                            // - parameter is located strictly on the left of current parameter declaration
                             if (symbol.valueDeclaration.pos < node.pos) {
                                 return;
                             }
+                            // - parameter is wrapped in function-like entity
                             if (ts.findAncestor(n, function (current) {
                                 if (current === node.initializer) {
                                     return "quit";
                                 }
                                 return ts.isFunctionLike(current.parent) ||
-                                    (current.parent.kind === 152 &&
-                                        !(ts.hasModifier(current.parent, 32)) &&
+                                    // computed property names/initializers in instance property declaration of class like entities
+                                    // are executed in constructor and thus deferred
+                                    (current.parent.kind === 152 /* PropertyDeclaration */ &&
+                                        !(ts.hasModifier(current.parent, 32 /* Static */)) &&
                                         ts.isClassLike(current.parent.parent));
                             })) {
                                 return;
                             }
+                            // fall through to report error
                         }
                         error(n, ts.Diagnostics.Initializer_of_parameter_0_cannot_reference_identifier_1_declared_after_it, ts.declarationNameToString(node.name), ts.declarationNameToString(n));
                     }
@@ -41010,56 +50242,68 @@ var ts;
         function convertAutoToAny(type) {
             return type === autoType ? anyType : type === autoArrayType ? anyArrayType : type;
         }
+        // Check variable, parameter, or property declaration
         function checkVariableLikeDeclaration(node) {
             checkDecorators(node);
             if (!ts.isBindingElement(node)) {
                 checkSourceElement(node.type);
             }
+            // JSDoc `function(string, string): string` syntax results in parameters with no name
             if (!node.name) {
                 return;
             }
-            if (node.name.kind === 147) {
+            // For a computed property, just check the initializer and exit
+            // Do not use hasDynamicName here, because that returns false for well known symbols.
+            // We want to perform checkComputedPropertyName for all computed properties, including
+            // well known symbols.
+            if (node.name.kind === 147 /* ComputedPropertyName */) {
                 checkComputedPropertyName(node.name);
                 if (node.initializer) {
                     checkExpressionCached(node.initializer);
                 }
             }
-            if (node.kind === 182) {
-                if (node.parent.kind === 180 && languageVersion < 6) {
-                    checkExternalEmitHelpers(node, 4);
+            if (node.kind === 182 /* BindingElement */) {
+                if (node.parent.kind === 180 /* ObjectBindingPattern */ && languageVersion < 6 /* ESNext */) {
+                    checkExternalEmitHelpers(node, 4 /* Rest */);
                 }
-                if (node.propertyName && node.propertyName.kind === 147) {
+                // check computed properties inside property names of binding elements
+                if (node.propertyName && node.propertyName.kind === 147 /* ComputedPropertyName */) {
                     checkComputedPropertyName(node.propertyName);
                 }
+                // check private/protected variable access
                 var parent = node.parent.parent;
                 var parentType = getTypeForBindingElementParent(parent);
                 var name = node.propertyName || node.name;
                 if (!ts.isBindingPattern(name)) {
-                    var property = getPropertyOfType(parentType, ts.getTextOfPropertyName(name));
-                    markPropertyAsReferenced(property, undefined, false);
+                    var property = getPropertyOfType(parentType, ts.getTextOfPropertyName(name)); // TODO: GH#18217
+                    markPropertyAsReferenced(property, /*nodeForCheckWriteOnly*/ undefined, /*isThisAccess*/ false); // A destructuring is never a write-only reference.
                     if (parent.initializer && property) {
                         checkPropertyAccessibility(parent, parent.initializer, parentType, property);
                     }
                 }
             }
+            // For a binding pattern, check contained binding elements
             if (ts.isBindingPattern(node.name)) {
-                if (node.name.kind === 181 && languageVersion < 2 && compilerOptions.downlevelIteration) {
-                    checkExternalEmitHelpers(node, 512);
+                if (node.name.kind === 181 /* ArrayBindingPattern */ && languageVersion < 2 /* ES2015 */ && compilerOptions.downlevelIteration) {
+                    checkExternalEmitHelpers(node, 512 /* Read */);
                 }
                 ts.forEach(node.name.elements, checkSourceElement);
             }
-            if (node.initializer && ts.getRootDeclaration(node).kind === 149 && ts.nodeIsMissing(ts.getContainingFunction(node).body)) {
+            // For a parameter declaration with an initializer, error and exit if the containing function doesn't have a body
+            if (node.initializer && ts.getRootDeclaration(node).kind === 149 /* Parameter */ && ts.nodeIsMissing(ts.getContainingFunction(node).body)) {
                 error(node, ts.Diagnostics.A_parameter_initializer_is_only_allowed_in_a_function_or_constructor_implementation);
                 return;
             }
+            // For a binding pattern, validate the initializer and exit
             if (ts.isBindingPattern(node.name)) {
-                if (node.initializer && node.parent.parent.kind !== 221) {
+                // Don't validate for-in initializer as it is already an error
+                if (node.initializer && node.parent.parent.kind !== 221 /* ForInStatement */) {
                     var initializerType = checkExpressionCached(node.initializer);
                     if (strictNullChecks && node.name.elements.length === 0) {
                         checkNonNullType(initializerType, node);
                     }
                     else {
-                        checkTypeAssignableTo(initializerType, getWidenedTypeForVariableLikeDeclaration(node), node, undefined);
+                        checkTypeAssignableTo(initializerType, getWidenedTypeForVariableLikeDeclaration(node), node, /*headMessage*/ undefined);
                     }
                     checkParameterInitializer(node);
                 }
@@ -41068,30 +50312,35 @@ var ts;
             var symbol = getSymbolOfNode(node);
             var type = convertAutoToAny(getTypeOfSymbol(symbol));
             if (node === symbol.valueDeclaration) {
+                // Node is the primary declaration of the symbol, just validate the initializer
+                // Don't validate for-in initializer as it is already an error
                 var initializer = ts.getEffectiveInitializer(node);
-                if (initializer && node.parent.parent.kind !== 221) {
-                    checkTypeAssignableTo(checkExpressionCached(initializer), type, node, undefined);
+                if (initializer && node.parent.parent.kind !== 221 /* ForInStatement */) {
+                    checkTypeAssignableTo(checkExpressionCached(initializer), type, node, /*headMessage*/ undefined);
                     checkParameterInitializer(node);
                 }
             }
             else {
+                // Node is a secondary declaration, check that type is identical to primary declaration and check that
+                // initializer is consistent with type associated with the node
                 var declarationType = convertAutoToAny(getWidenedTypeForVariableLikeDeclaration(node));
                 if (type !== errorType && declarationType !== errorType &&
                     !isTypeIdenticalTo(type, declarationType) &&
-                    !(symbol.flags & 67108864)) {
+                    !(symbol.flags & 67108864 /* JSContainer */)) {
                     errorNextVariableOrPropertyDeclarationMustHaveSameType(type, node, declarationType);
                 }
                 if (node.initializer) {
-                    checkTypeAssignableTo(checkExpressionCached(node.initializer), declarationType, node, undefined);
+                    checkTypeAssignableTo(checkExpressionCached(node.initializer), declarationType, node, /*headMessage*/ undefined);
                 }
                 if (!areDeclarationFlagsIdentical(node, symbol.valueDeclaration)) {
                     error(ts.getNameOfDeclaration(symbol.valueDeclaration), ts.Diagnostics.All_declarations_of_0_must_have_identical_modifiers, ts.declarationNameToString(node.name));
                     error(node.name, ts.Diagnostics.All_declarations_of_0_must_have_identical_modifiers, ts.declarationNameToString(node.name));
                 }
             }
-            if (node.kind !== 152 && node.kind !== 151) {
+            if (node.kind !== 152 /* PropertyDeclaration */ && node.kind !== 151 /* PropertySignature */) {
+                // We know we don't have a binding pattern or computed name here
                 checkExportsOnMergedDeclarations(node);
-                if (node.kind === 232 || node.kind === 182) {
+                if (node.kind === 232 /* VariableDeclaration */ || node.kind === 182 /* BindingElement */) {
                     checkVarDeclaredNamesNotShadowed(node);
                 }
                 checkCollisionWithRequireExportsInGeneratedCode(node, node.name);
@@ -41100,25 +50349,26 @@ var ts;
         }
         function errorNextVariableOrPropertyDeclarationMustHaveSameType(firstType, nextDeclaration, nextType) {
             var nextDeclarationName = ts.getNameOfDeclaration(nextDeclaration);
-            var message = nextDeclaration.kind === 152 || nextDeclaration.kind === 151
+            var message = nextDeclaration.kind === 152 /* PropertyDeclaration */ || nextDeclaration.kind === 151 /* PropertySignature */
                 ? ts.Diagnostics.Subsequent_property_declarations_must_have_the_same_type_Property_0_must_be_of_type_1_but_here_has_type_2
                 : ts.Diagnostics.Subsequent_variable_declarations_must_have_the_same_type_Variable_0_must_be_of_type_1_but_here_has_type_2;
             error(nextDeclarationName, message, ts.declarationNameToString(nextDeclarationName), typeToString(firstType), typeToString(nextType));
         }
         function areDeclarationFlagsIdentical(left, right) {
-            if ((left.kind === 149 && right.kind === 232) ||
-                (left.kind === 232 && right.kind === 149)) {
+            if ((left.kind === 149 /* Parameter */ && right.kind === 232 /* VariableDeclaration */) ||
+                (left.kind === 232 /* VariableDeclaration */ && right.kind === 149 /* Parameter */)) {
+                // Differences in optionality between parameters and variables are allowed.
                 return true;
             }
             if (ts.hasQuestionToken(left) !== ts.hasQuestionToken(right)) {
                 return false;
             }
-            var interestingFlags = 8 |
-                16 |
-                256 |
-                128 |
-                64 |
-                32;
+            var interestingFlags = 8 /* Private */ |
+                16 /* Protected */ |
+                256 /* Async */ |
+                128 /* Abstract */ |
+                64 /* Readonly */ |
+                32 /* Static */;
             return ts.getSelectedModifierFlags(left, interestingFlags) === ts.getSelectedModifierFlags(right, interestingFlags);
         }
         function checkVariableDeclaration(node) {
@@ -41130,41 +50380,47 @@ var ts;
             return checkVariableLikeDeclaration(node);
         }
         function checkVariableStatement(node) {
+            // Grammar checking
             if (!checkGrammarDecoratorsAndModifiers(node) && !checkGrammarVariableDeclarationList(node.declarationList))
                 checkGrammarForDisallowedLetOrConstStatement(node);
             ts.forEach(node.declarationList.declarations, checkSourceElement);
         }
         function checkExpressionStatement(node) {
+            // Grammar checking
             checkGrammarStatementInAmbientContext(node);
             checkExpression(node.expression);
         }
         function checkIfStatement(node) {
+            // Grammar checking
             checkGrammarStatementInAmbientContext(node);
             checkExpression(node.expression);
             checkSourceElement(node.thenStatement);
-            if (node.thenStatement.kind === 215) {
+            if (node.thenStatement.kind === 215 /* EmptyStatement */) {
                 error(node.thenStatement, ts.Diagnostics.The_body_of_an_if_statement_cannot_be_the_empty_statement);
             }
             checkSourceElement(node.elseStatement);
         }
         function checkDoStatement(node) {
+            // Grammar checking
             checkGrammarStatementInAmbientContext(node);
             checkSourceElement(node.statement);
             checkExpression(node.expression);
         }
         function checkWhileStatement(node) {
+            // Grammar checking
             checkGrammarStatementInAmbientContext(node);
             checkExpression(node.expression);
             checkSourceElement(node.statement);
         }
         function checkForStatement(node) {
+            // Grammar checking
             if (!checkGrammarStatementInAmbientContext(node)) {
-                if (node.initializer && node.initializer.kind === 233) {
+                if (node.initializer && node.initializer.kind === 233 /* VariableDeclarationList */) {
                     checkGrammarVariableDeclarationList(node.initializer);
                 }
             }
             if (node.initializer) {
-                if (node.initializer.kind === 233) {
+                if (node.initializer.kind === 233 /* VariableDeclarationList */) {
                     ts.forEach(node.initializer.declarations, checkVariableDeclaration);
                 }
                 else {
@@ -41184,27 +50440,42 @@ var ts;
             checkGrammarForInOrForOfStatement(node);
             if (node.awaitModifier) {
                 var functionFlags = ts.getFunctionFlags(ts.getContainingFunction(node));
-                if ((functionFlags & (4 | 2)) === 2 && languageVersion < 6) {
-                    checkExternalEmitHelpers(node, 16384);
+                if ((functionFlags & (4 /* Invalid */ | 2 /* Async */)) === 2 /* Async */ && languageVersion < 6 /* ESNext */) {
+                    // for..await..of in an async function or async generator function prior to ESNext requires the __asyncValues helper
+                    checkExternalEmitHelpers(node, 16384 /* ForAwaitOfIncludes */);
                 }
             }
-            else if (compilerOptions.downlevelIteration && languageVersion < 2) {
-                checkExternalEmitHelpers(node, 256);
+            else if (compilerOptions.downlevelIteration && languageVersion < 2 /* ES2015 */) {
+                // for..of prior to ES2015 requires the __values helper when downlevelIteration is enabled
+                checkExternalEmitHelpers(node, 256 /* ForOfIncludes */);
             }
-            if (node.initializer.kind === 233) {
+            // Check the LHS and RHS
+            // If the LHS is a declaration, just check it as a variable declaration, which will in turn check the RHS
+            // via checkRightHandSideOfForOf.
+            // If the LHS is an expression, check the LHS, as a destructuring assignment or as a reference.
+            // Then check that the RHS is assignable to it.
+            if (node.initializer.kind === 233 /* VariableDeclarationList */) {
                 checkForInOrForOfVariableDeclaration(node);
             }
             else {
                 var varExpr = node.initializer;
                 var iteratedType = checkRightHandSideOfForOf(node.expression, node.awaitModifier);
-                if (varExpr.kind === 183 || varExpr.kind === 184) {
+                // There may be a destructuring assignment on the left side
+                if (varExpr.kind === 183 /* ArrayLiteralExpression */ || varExpr.kind === 184 /* ObjectLiteralExpression */) {
+                    // iteratedType may be undefined. In this case, we still want to check the structure of
+                    // varExpr, in particular making sure it's a valid LeftHandSideExpression. But we'd like
+                    // to short circuit the type relation checking as much as possible, so we pass the unknownType.
                     checkDestructuringAssignment(varExpr, iteratedType || errorType);
                 }
                 else {
                     var leftType = checkExpression(varExpr);
                     checkReferenceExpression(varExpr, ts.Diagnostics.The_left_hand_side_of_a_for_of_statement_must_be_a_variable_or_a_property_access);
+                    // iteratedType will be undefined if the rightType was missing properties/signatures
+                    // required to get its iteratedType (like [Symbol.iterator] or next). This may be
+                    // because we accessed properties from anyType, or it may have led to an error inside
+                    // getElementTypeOfIterable.
                     if (iteratedType) {
-                        checkTypeAssignableTo(iteratedType, leftType, varExpr, undefined);
+                        checkTypeAssignableTo(iteratedType, leftType, varExpr, /*headMessage*/ undefined);
                     }
                 }
             }
@@ -41214,9 +50485,15 @@ var ts;
             }
         }
         function checkForInStatement(node) {
+            // Grammar checking
             checkGrammarForInOrForOfStatement(node);
             var rightType = checkNonNullExpression(node.expression);
-            if (node.initializer.kind === 233) {
+            // TypeScript 1.0 spec (April 2014): 5.4
+            // In a 'for-in' statement of the form
+            // for (let VarDecl in Expr) Statement
+            //   VarDecl must be a variable declaration without a type annotation that declares a variable of type Any,
+            //   and Expr must be an expression of type Any, an object type, or a type parameter type.
+            if (node.initializer.kind === 233 /* VariableDeclarationList */) {
                 var variable = node.initializer.declarations[0];
                 if (variable && ts.isBindingPattern(variable.name)) {
                     error(variable.name, ts.Diagnostics.The_left_hand_side_of_a_for_in_statement_cannot_be_a_destructuring_pattern);
@@ -41224,19 +50501,26 @@ var ts;
                 checkForInOrForOfVariableDeclaration(node);
             }
             else {
+                // In a 'for-in' statement of the form
+                // for (Var in Expr) Statement
+                //   Var must be an expression classified as a reference of type Any or the String primitive type,
+                //   and Expr must be an expression of type Any, an object type, or a type parameter type.
                 var varExpr = node.initializer;
                 var leftType = checkExpression(varExpr);
-                if (varExpr.kind === 183 || varExpr.kind === 184) {
+                if (varExpr.kind === 183 /* ArrayLiteralExpression */ || varExpr.kind === 184 /* ObjectLiteralExpression */) {
                     error(varExpr, ts.Diagnostics.The_left_hand_side_of_a_for_in_statement_cannot_be_a_destructuring_pattern);
                 }
                 else if (!isTypeAssignableTo(getIndexTypeOrString(rightType), leftType)) {
                     error(varExpr, ts.Diagnostics.The_left_hand_side_of_a_for_in_statement_must_be_of_type_string_or_any);
                 }
                 else {
+                    // run check only former check succeeded to avoid cascading errors
                     checkReferenceExpression(varExpr, ts.Diagnostics.The_left_hand_side_of_a_for_in_statement_must_be_a_variable_or_a_property_access);
                 }
             }
-            if (rightType === neverType || !isTypeAssignableToKind(rightType, 16777216 | 14745600)) {
+            // unknownType is returned i.e. if node.expression is identifier whose name cannot be resolved
+            // in this case error about missing name is already reported - do not report extra one
+            if (rightType === neverType || !isTypeAssignableToKind(rightType, 16777216 /* NonPrimitive */ | 14745600 /* InstantiableNonPrimitive */)) {
                 error(node.expression, ts.Diagnostics.The_right_hand_side_of_a_for_in_statement_must_be_of_type_any_an_object_type_or_a_type_parameter_but_here_has_type_0, typeToString(rightType));
             }
             checkSourceElement(node.statement);
@@ -41246,6 +50530,7 @@ var ts;
         }
         function checkForInOrForOfVariableDeclaration(iterationStatement) {
             var variableDeclarationList = iterationStatement.initializer;
+            // checkGrammarForInOrForOfStatement will check that there is exactly one declaration.
             if (variableDeclarationList.declarations.length >= 1) {
                 var decl = variableDeclarationList.declarations[0];
                 checkVariableDeclaration(decl);
@@ -41253,23 +50538,32 @@ var ts;
         }
         function checkRightHandSideOfForOf(rhsExpression, awaitModifier) {
             var expressionType = checkNonNullExpression(rhsExpression);
-            return checkIteratedTypeOrElementType(expressionType, rhsExpression, true, awaitModifier !== undefined);
+            return checkIteratedTypeOrElementType(expressionType, rhsExpression, /*allowStringInput*/ true, awaitModifier !== undefined);
         }
         function checkIteratedTypeOrElementType(inputType, errorNode, allowStringInput, allowAsyncIterables) {
             if (isTypeAny(inputType)) {
                 return inputType;
             }
-            return getIteratedTypeOrElementType(inputType, errorNode, allowStringInput, allowAsyncIterables, true) || anyType;
+            return getIteratedTypeOrElementType(inputType, errorNode, allowStringInput, allowAsyncIterables, /*checkAssignability*/ true) || anyType;
         }
+        /**
+         * When consuming an iterable type in a for..of, spread, or iterator destructuring assignment
+         * we want to get the iterated type of an iterable for ES2015 or later, or the iterated type
+         * of a iterable (if defined globally) or element type of an array like for ES2015 or earlier.
+         */
         function getIteratedTypeOrElementType(inputType, errorNode, allowStringInput, allowAsyncIterables, checkAssignability) {
             if (inputType === neverType) {
-                reportTypeNotIterableError(errorNode, inputType, allowAsyncIterables);
+                reportTypeNotIterableError(errorNode, inputType, allowAsyncIterables); // TODO: GH#18217
                 return undefined;
             }
-            var uplevelIteration = languageVersion >= 2;
+            var uplevelIteration = languageVersion >= 2 /* ES2015 */;
             var downlevelIteration = !uplevelIteration && compilerOptions.downlevelIteration;
+            // Get the iterated type of an `Iterable<T>` or `IterableIterator<T>` only in ES2015
+            // or higher, when inside of an async generator or for-await-if, or when
+            // downlevelIteration is requested.
             if (uplevelIteration || downlevelIteration || allowAsyncIterables) {
-                var iteratedType = getIteratedTypeOfIterable(inputType, uplevelIteration ? errorNode : undefined, allowAsyncIterables, true, checkAssignability);
+                // We only report errors for an invalid iterable type in ES2015 or higher.
+                var iteratedType = getIteratedTypeOfIterable(inputType, uplevelIteration ? errorNode : undefined, allowAsyncIterables, /*allowSyncIterables*/ true, checkAssignability);
                 if (iteratedType || uplevelIteration) {
                     return iteratedType;
                 }
@@ -41277,33 +50571,45 @@ var ts;
             var arrayType = inputType;
             var reportedError = false;
             var hasStringConstituent = false;
+            // If strings are permitted, remove any string-like constituents from the array type.
+            // This allows us to find other non-string element types from an array unioned with
+            // a string.
             if (allowStringInput) {
-                if (arrayType.flags & 262144) {
+                if (arrayType.flags & 262144 /* Union */) {
+                    // After we remove all types that are StringLike, we will know if there was a string constituent
+                    // based on whether the result of filter is a new array.
                     var arrayTypes = inputType.types;
-                    var filteredTypes = ts.filter(arrayTypes, function (t) { return !(t.flags & 68); });
+                    var filteredTypes = ts.filter(arrayTypes, function (t) { return !(t.flags & 68 /* StringLike */); });
                     if (filteredTypes !== arrayTypes) {
-                        arrayType = getUnionType(filteredTypes, 2);
+                        arrayType = getUnionType(filteredTypes, 2 /* Subtype */);
                     }
                 }
-                else if (arrayType.flags & 68) {
+                else if (arrayType.flags & 68 /* StringLike */) {
                     arrayType = neverType;
                 }
                 hasStringConstituent = arrayType !== inputType;
                 if (hasStringConstituent) {
-                    if (languageVersion < 1) {
+                    if (languageVersion < 1 /* ES5 */) {
                         if (errorNode) {
                             error(errorNode, ts.Diagnostics.Using_a_string_in_a_for_of_statement_is_only_supported_in_ECMAScript_5_and_higher);
                             reportedError = true;
                         }
                     }
-                    if (arrayType.flags & 32768) {
+                    // Now that we've removed all the StringLike types, if no constituents remain, then the entire
+                    // arrayOrStringType was a string.
+                    if (arrayType.flags & 32768 /* Never */) {
                         return stringType;
                     }
                 }
             }
             if (!isArrayLikeType(arrayType)) {
                 if (errorNode && !reportedError) {
-                    var isIterable = !!getIteratedTypeOfIterable(inputType, undefined, allowAsyncIterables, true, checkAssignability);
+                    // Which error we report depends on whether we allow strings or if there was a
+                    // string constituent. For example, if the input type is number | string, we
+                    // want to say that number is not an array type. But if the input was just
+                    // number and string input is allowed, we want to say that number is not an
+                    // array type or a string type.
+                    var isIterable = !!getIteratedTypeOfIterable(inputType, /* errorNode */ undefined, allowAsyncIterables, /*allowSyncIterables*/ true, checkAssignability);
                     var diagnostic = !allowStringInput || hasStringConstituent
                         ? downlevelIteration
                             ? ts.Diagnostics.Type_0_is_not_an_array_type_or_does_not_have_a_Symbol_iterator_method_that_returns_an_iterator
@@ -41319,15 +50625,54 @@ var ts;
                 }
                 return hasStringConstituent ? stringType : undefined;
             }
-            var arrayElementType = getIndexTypeOfType(arrayType, 1);
+            var arrayElementType = getIndexTypeOfType(arrayType, 1 /* Number */);
             if (hasStringConstituent && arrayElementType) {
-                if (arrayElementType.flags & 68) {
+                // This is just an optimization for the case where arrayOrStringType is string | string[]
+                if (arrayElementType.flags & 68 /* StringLike */) {
                     return stringType;
                 }
-                return getUnionType([arrayElementType, stringType], 2);
+                return getUnionType([arrayElementType, stringType], 2 /* Subtype */);
             }
             return arrayElementType;
         }
+        /**
+         * We want to treat type as an iterable, and get the type it is an iterable of. The iterable
+         * must have the following structure (annotated with the names of the variables below):
+         *
+         *     { // iterable
+         *         [Symbol.iterator]: { // iteratorMethod
+         *             (): Iterator<T>
+         *         }
+         *     }
+         *
+         * For an async iterable, we expect the following structure:
+         *
+         *     { // iterable
+         *         [Symbol.asyncIterator]: { // iteratorMethod
+         *             (): AsyncIterator<T>
+         *         }
+         *     }
+         *
+         * T is the type we are after. At every level that involves analyzing return types
+         * of signatures, we union the return types of all the signatures.
+         *
+         * Another thing to note is that at any step of this process, we could run into a dead end,
+         * meaning either the property is missing, or we run into the anyType. If either of these things
+         * happens, we return undefined to signal that we could not find the iterated type. If a property
+         * is missing, and the previous step did not result in 'any', then we also give an error if the
+         * caller requested it. Then the caller can decide what to do in the case where there is no iterated
+         * type. This is different from returning anyType, because that would signify that we have matched the
+         * whole pattern and that T (above) is 'any'.
+         *
+         * For a **for-of** statement, `yield*` (in a normal generator), spread, array
+         * destructuring, or normal generator we will only ever look for a `[Symbol.iterator]()`
+         * method.
+         *
+         * For an async generator we will only ever look at the `[Symbol.asyncIterator]()` method.
+         *
+         * For a **for-await-of** statement or a `yield*` in an async generator we will look for
+         * the `[Symbol.asyncIterator]()` method first, and then the `[Symbol.iterator]()` method.
+         */
         function getIteratedTypeOfIterable(type, errorNode, allowAsyncIterables, allowSyncIterables, checkAssignability) {
             if (isTypeAny(type)) {
                 return undefined;
@@ -41339,8 +50684,10 @@ var ts;
                     if (typeAsIterable.iteratedTypeOfAsyncIterable) {
                         return typeAsIterable.iteratedTypeOfAsyncIterable;
                     }
-                    if (isReferenceToType(type, getGlobalAsyncIterableType(false)) ||
-                        isReferenceToType(type, getGlobalAsyncIterableIteratorType(false))) {
+                    // As an optimization, if the type is an instantiation of the global `AsyncIterable<T>`
+                    // or the global `AsyncIterableIterator<T>` then just grab its type argument.
+                    if (isReferenceToType(type, getGlobalAsyncIterableType(/*reportErrors*/ false)) ||
+                        isReferenceToType(type, getGlobalAsyncIterableIteratorType(/*reportErrors*/ false))) {
                         return typeAsIterable.iteratedTypeOfAsyncIterable = type.typeArguments[0];
                     }
                 }
@@ -41348,8 +50695,10 @@ var ts;
                     if (typeAsIterable.iteratedTypeOfIterable) {
                         return typeAsIterable.iteratedTypeOfIterable;
                     }
-                    if (isReferenceToType(type, getGlobalIterableType(false)) ||
-                        isReferenceToType(type, getGlobalIterableIteratorType(false))) {
+                    // As an optimization, if the type is an instantiation of the global `Iterable<T>` or
+                    // `IterableIterator<T>` then just grab its type argument.
+                    if (isReferenceToType(type, getGlobalIterableType(/*reportErrors*/ false)) ||
+                        isReferenceToType(type, getGlobalIterableIteratorType(/*reportErrors*/ false))) {
                         return typeAsIterable.iteratedTypeOfIterable = type.typeArguments[0];
                     }
                 }
@@ -41358,17 +50707,21 @@ var ts;
                 if (isTypeAny(methodType)) {
                     return undefined;
                 }
-                var signatures = methodType ? getSignaturesOfType(methodType, 0) : undefined;
+                var signatures = methodType ? getSignaturesOfType(methodType, 0 /* Call */) : undefined;
                 if (!ts.some(signatures)) {
                     if (errorNode) {
+                        // only report on the first error
                         reportTypeNotIterableError(errorNode, type, allowAsyncIterables);
                         errorNode = undefined;
                     }
                     return undefined;
                 }
-                var returnType = getUnionType(ts.map(signatures, getReturnTypeOfSignature), 2);
-                var iteratedType = getIteratedTypeOfIterator(returnType, errorNode, !!asyncMethodType);
+                var returnType = getUnionType(ts.map(signatures, getReturnTypeOfSignature), 2 /* Subtype */);
+                var iteratedType = getIteratedTypeOfIterator(returnType, errorNode, /*isAsyncIterator*/ !!asyncMethodType);
                 if (checkAssignability && errorNode && iteratedType) {
+                    // If `checkAssignability` was specified, we were called from
+                    // `checkIteratedTypeOrElementType`. As such, we need to validate that
+                    // the type passed in is actually an Iterable.
                     checkTypeAssignableTo(type, asyncMethodType
                         ? createAsyncIterableType(iteratedType)
                         : createIterableType(iteratedType), errorNode);
@@ -41383,6 +50736,28 @@ var ts;
                 ? ts.Diagnostics.Type_0_must_have_a_Symbol_asyncIterator_method_that_returns_an_async_iterator
                 : ts.Diagnostics.Type_0_must_have_a_Symbol_iterator_method_that_returns_an_iterator, typeToString(type));
         }
+        /**
+         * This function has very similar logic as getIteratedTypeOfIterable, except that it operates on
+         * Iterators instead of Iterables. Here is the structure:
+         *
+         *  { // iterator
+         *      next: { // nextMethod
+         *          (): { // nextResult
+         *              value: T // nextValue
+         *          }
+         *      }
+         *  }
+         *
+         * For an async iterator, we expect the following structure:
+         *
+         *  { // iterator
+         *      next: { // nextMethod
+         *          (): PromiseLike<{ // nextResult
+         *              value: T // nextValue
+         *          }>
+         *      }
+         *  }
+         */
         function getIteratedTypeOfIterator(type, errorNode, isAsyncIterator) {
             if (isTypeAny(type)) {
                 return undefined;
@@ -41391,17 +50766,21 @@ var ts;
             if (isAsyncIterator ? typeAsIterator.iteratedTypeOfAsyncIterator : typeAsIterator.iteratedTypeOfIterator) {
                 return isAsyncIterator ? typeAsIterator.iteratedTypeOfAsyncIterator : typeAsIterator.iteratedTypeOfIterator;
             }
+            // As an optimization, if the type is an instantiation of the global `Iterator<T>` (for
+            // a non-async iterator) or the global `AsyncIterator<T>` (for an async-iterator) then
+            // just grab its type argument.
             var getIteratorType = isAsyncIterator ? getGlobalAsyncIteratorType : getGlobalIteratorType;
-            if (isReferenceToType(type, getIteratorType(false))) {
+            if (isReferenceToType(type, getIteratorType(/*reportErrors*/ false))) {
                 return isAsyncIterator
                     ? typeAsIterator.iteratedTypeOfAsyncIterator = type.typeArguments[0]
                     : typeAsIterator.iteratedTypeOfIterator = type.typeArguments[0];
             }
+            // Both async and non-async iterators must have a `next` method.
             var nextMethod = getTypeOfPropertyOfType(type, "next");
             if (isTypeAny(nextMethod)) {
                 return undefined;
             }
-            var nextMethodSignatures = nextMethod ? getSignaturesOfType(nextMethod, 0) : ts.emptyArray;
+            var nextMethodSignatures = nextMethod ? getSignaturesOfType(nextMethod, 0 /* Call */) : ts.emptyArray;
             if (nextMethodSignatures.length === 0) {
                 if (errorNode) {
                     error(errorNode, isAsyncIterator
@@ -41410,10 +50789,11 @@ var ts;
                 }
                 return undefined;
             }
-            var nextResult = getUnionType(ts.map(nextMethodSignatures, getReturnTypeOfSignature), 2);
+            var nextResult = getUnionType(ts.map(nextMethodSignatures, getReturnTypeOfSignature), 2 /* Subtype */);
             if (isTypeAny(nextResult)) {
                 return undefined;
             }
+            // For an async iterator, we must get the awaited type of the return type.
             if (isAsyncIterator) {
                 nextResult = getAwaitedTypeOfPromise(nextResult, errorNode, ts.Diagnostics.The_type_returned_by_the_next_method_of_an_async_iterator_must_be_a_promise_for_a_type_with_a_value_property);
                 if (isTypeAny(nextResult)) {
@@ -41433,28 +50813,37 @@ var ts;
                 ? typeAsIterator.iteratedTypeOfAsyncIterator = nextValue
                 : typeAsIterator.iteratedTypeOfIterator = nextValue;
         }
+        /**
+         * A generator may have a return type of `Iterator<T>`, `Iterable<T>`, or
+         * `IterableIterator<T>`. An async generator may have a return type of `AsyncIterator<T>`,
+         * `AsyncIterable<T>`, or `AsyncIterableIterator<T>`. This function can be used to extract
+         * the iterated type from this return type for contextual typing and verifying signatures.
+         */
         function getIteratedTypeOfGenerator(returnType, isAsyncGenerator) {
             if (isTypeAny(returnType)) {
                 return undefined;
             }
-            return getIteratedTypeOfIterable(returnType, undefined, isAsyncGenerator, !isAsyncGenerator, false)
-                || getIteratedTypeOfIterator(returnType, undefined, isAsyncGenerator);
+            return getIteratedTypeOfIterable(returnType, /*errorNode*/ undefined, /*allowAsyncIterables*/ isAsyncGenerator, /*allowSyncIterables*/ !isAsyncGenerator, /*checkAssignability*/ false)
+                || getIteratedTypeOfIterator(returnType, /*errorNode*/ undefined, isAsyncGenerator);
         }
         function checkBreakOrContinueStatement(node) {
+            // Grammar checking
             if (!checkGrammarStatementInAmbientContext(node))
                 checkGrammarBreakOrContinueStatement(node);
+            // TODO: Check that target label is valid
         }
         function isGetAccessorWithAnnotatedSetAccessor(node) {
-            return node.kind === 156
-                && ts.getEffectiveSetAccessorTypeAnnotationNode(ts.getDeclarationOfKind(node.symbol, 157)) !== undefined;
+            return node.kind === 156 /* GetAccessor */
+                && ts.getEffectiveSetAccessorTypeAnnotationNode(ts.getDeclarationOfKind(node.symbol, 157 /* SetAccessor */)) !== undefined;
         }
         function isUnwrappedReturnTypeVoidOrAny(func, returnType) {
-            var unwrappedReturnType = (ts.getFunctionFlags(func) & 3) === 2
-                ? getPromisedTypeOfPromise(returnType)
-                : returnType;
-            return !!unwrappedReturnType && maybeTypeOfKind(unwrappedReturnType, 4096 | 3);
+            var unwrappedReturnType = (ts.getFunctionFlags(func) & 3 /* AsyncGenerator */) === 2 /* Async */
+                ? getPromisedTypeOfPromise(returnType) // Async function
+                : returnType; // AsyncGenerator function, Generator function, or normal function
+            return !!unwrappedReturnType && maybeTypeOfKind(unwrappedReturnType, 4096 /* Void */ | 3 /* AnyOrUnknown */);
         }
         function checkReturnStatement(node) {
+            // Grammar checking
             if (checkGrammarStatementInAmbientContext(node)) {
                 return;
             }
@@ -41466,27 +50855,34 @@ var ts;
             var signature = getSignatureFromDeclaration(func);
             var returnType = getReturnTypeOfSignature(signature);
             var functionFlags = ts.getFunctionFlags(func);
-            var isGenerator = functionFlags & 1;
-            if (strictNullChecks || node.expression || returnType.flags & 32768) {
+            var isGenerator = functionFlags & 1 /* Generator */;
+            if (strictNullChecks || node.expression || returnType.flags & 32768 /* Never */) {
                 var exprType = node.expression ? checkExpressionCached(node.expression) : undefinedType;
-                if (isGenerator) {
+                if (isGenerator) { // AsyncGenerator function or Generator function
+                    // A generator does not need its return expressions checked against its return type.
+                    // Instead, the yield expressions are checked against the element type.
+                    // TODO: Check return types of generators when return type tracking is added
+                    // for generators.
                     return;
                 }
-                else if (func.kind === 157) {
+                else if (func.kind === 157 /* SetAccessor */) {
                     if (node.expression) {
                         error(node, ts.Diagnostics.Setters_cannot_return_a_value);
                     }
                 }
-                else if (func.kind === 155) {
+                else if (func.kind === 155 /* Constructor */) {
                     if (node.expression && !checkTypeAssignableTo(exprType, returnType, node)) {
                         error(node, ts.Diagnostics.Return_type_of_constructor_signature_must_be_assignable_to_the_instance_type_of_the_class);
                     }
                 }
                 else if (ts.getEffectiveReturnTypeNode(func) || isGetAccessorWithAnnotatedSetAccessor(func)) {
-                    if (functionFlags & 2) {
+                    if (functionFlags & 2 /* Async */) { // Async function
                         var promisedType = getPromisedTypeOfPromise(returnType);
                         var awaitedType = checkAwaitedType(exprType, node, ts.Diagnostics.The_return_type_of_an_async_function_must_either_be_a_valid_promise_or_must_not_contain_a_callable_then_member);
                         if (promisedType) {
+                            // If the function has a return type, but promisedType is
+                            // undefined, an error will be reported in checkAsyncFunctionReturnType
+                            // so we don't need to report one here.
                             checkTypeAssignableTo(awaitedType, promisedType, node);
                         }
                     }
@@ -41495,13 +50891,15 @@ var ts;
                     }
                 }
             }
-            else if (func.kind !== 155 && compilerOptions.noImplicitReturns && !isUnwrappedReturnTypeVoidOrAny(func, returnType) && !isGenerator) {
+            else if (func.kind !== 155 /* Constructor */ && compilerOptions.noImplicitReturns && !isUnwrappedReturnTypeVoidOrAny(func, returnType) && !isGenerator) {
+                // The function has a return type, but the return statement doesn't have an expression.
                 error(node, ts.Diagnostics.Not_all_code_paths_return_a_value);
             }
         }
         function checkWithStatement(node) {
+            // Grammar checking for withStatement
             if (!checkGrammarStatementInAmbientContext(node)) {
-                if (node.flags & 16384) {
+                if (node.flags & 16384 /* AwaitContext */) {
                     grammarErrorOnFirstToken(node, ts.Diagnostics.with_statements_are_not_allowed_in_an_async_function_block);
                 }
             }
@@ -41514,13 +50912,15 @@ var ts;
             }
         }
         function checkSwitchStatement(node) {
+            // Grammar checking
             checkGrammarStatementInAmbientContext(node);
             var firstDefaultClause;
             var hasDuplicateDefaultClause = false;
             var expressionType = checkExpression(node.expression);
             var expressionIsLiteral = isLiteralType(expressionType);
             ts.forEach(node.caseBlock.clauses, function (clause) {
-                if (clause.kind === 267 && !hasDuplicateDefaultClause) {
+                // Grammar check for duplicate default clauses, skip if we already report duplicate default clause
+                if (clause.kind === 267 /* DefaultClause */ && !hasDuplicateDefaultClause) {
                     if (firstDefaultClause === undefined) {
                         firstDefaultClause = clause;
                     }
@@ -41532,7 +50932,10 @@ var ts;
                         hasDuplicateDefaultClause = true;
                     }
                 }
-                if (produceDiagnostics && clause.kind === 266) {
+                if (produceDiagnostics && clause.kind === 266 /* CaseClause */) {
+                    // TypeScript 1.0 spec (April 2014): 5.9
+                    // In a 'switch' statement, each 'case' expression must be of a type that is comparable
+                    // to or from the type of the 'switch' expression.
                     var caseType = checkExpression(clause.expression);
                     var caseIsLiteral = isLiteralType(caseType);
                     var comparedExpressionType = expressionType;
@@ -41541,7 +50944,8 @@ var ts;
                         comparedExpressionType = getBaseTypeOfLiteralType(expressionType);
                     }
                     if (!isTypeEqualityComparableTo(comparedExpressionType, caseType)) {
-                        checkTypeComparableTo(caseType, comparedExpressionType, clause.expression, undefined);
+                        // expressionType is not comparable to caseType, try the reversed check and report errors if it fails
+                        checkTypeComparableTo(caseType, comparedExpressionType, clause.expression, /*headMessage*/ undefined);
                     }
                 }
                 ts.forEach(clause.statements, checkSourceElement);
@@ -41551,21 +50955,24 @@ var ts;
             }
         }
         function checkLabeledStatement(node) {
+            // Grammar checking
             if (!checkGrammarStatementInAmbientContext(node)) {
                 ts.findAncestor(node.parent, function (current) {
                     if (ts.isFunctionLike(current)) {
                         return "quit";
                     }
-                    if (current.kind === 228 && current.label.escapedText === node.label.escapedText) {
+                    if (current.kind === 228 /* LabeledStatement */ && current.label.escapedText === node.label.escapedText) {
                         grammarErrorOnNode(node.label, ts.Diagnostics.Duplicate_label_0, ts.getTextOfNode(node.label));
                         return true;
                     }
                     return false;
                 });
             }
+            // ensure that label is unique
             checkSourceElement(node.statement);
         }
         function checkThrowStatement(node) {
+            // Grammar checking
             if (!checkGrammarStatementInAmbientContext(node)) {
                 if (node.expression === undefined) {
                     grammarErrorAfterFirstToken(node, ts.Diagnostics.Line_break_not_permitted_here);
@@ -41576,10 +50983,12 @@ var ts;
             }
         }
         function checkTryStatement(node) {
+            // Grammar checking
             checkGrammarStatementInAmbientContext(node);
             checkBlock(node.tryBlock);
             var catchClause = node.catchClause;
             if (catchClause) {
+                // Grammar checking
                 if (catchClause.variableDeclaration) {
                     if (catchClause.variableDeclaration.type) {
                         grammarErrorOnFirstToken(catchClause.variableDeclaration.type, ts.Diagnostics.Catch_clause_variable_cannot_have_a_type_annotation);
@@ -41592,7 +51001,7 @@ var ts;
                         if (blockLocals_1) {
                             ts.forEachKey(catchClause.locals, function (caughtName) {
                                 var blockLocal = blockLocals_1.get(caughtName);
-                                if (blockLocal && (blockLocal.flags & 2) !== 0) {
+                                if (blockLocal && (blockLocal.flags & 2 /* BlockScopedVariable */) !== 0) {
                                     grammarErrorOnNode(blockLocal.valueDeclaration, ts.Diagnostics.Cannot_redeclare_identifier_0_in_catch_clause, caughtName);
                                 }
                             });
@@ -41606,25 +51015,28 @@ var ts;
             }
         }
         function checkIndexConstraints(type) {
-            var declaredNumberIndexer = getIndexDeclarationOfSymbol(type.symbol, 1);
-            var declaredStringIndexer = getIndexDeclarationOfSymbol(type.symbol, 0);
-            var stringIndexType = getIndexTypeOfType(type, 0);
-            var numberIndexType = getIndexTypeOfType(type, 1);
+            var declaredNumberIndexer = getIndexDeclarationOfSymbol(type.symbol, 1 /* Number */);
+            var declaredStringIndexer = getIndexDeclarationOfSymbol(type.symbol, 0 /* String */);
+            var stringIndexType = getIndexTypeOfType(type, 0 /* String */);
+            var numberIndexType = getIndexTypeOfType(type, 1 /* Number */);
             if (stringIndexType || numberIndexType) {
                 ts.forEach(getPropertiesOfObjectType(type), function (prop) {
                     var propType = getTypeOfSymbol(prop);
-                    checkIndexConstraintForProperty(prop, propType, type, declaredStringIndexer, stringIndexType, 0);
-                    checkIndexConstraintForProperty(prop, propType, type, declaredNumberIndexer, numberIndexType, 1);
+                    checkIndexConstraintForProperty(prop, propType, type, declaredStringIndexer, stringIndexType, 0 /* String */);
+                    checkIndexConstraintForProperty(prop, propType, type, declaredNumberIndexer, numberIndexType, 1 /* Number */);
                 });
                 var classDeclaration = type.symbol.valueDeclaration;
-                if (ts.getObjectFlags(type) & 1 && ts.isClassLike(classDeclaration)) {
+                if (ts.getObjectFlags(type) & 1 /* Class */ && ts.isClassLike(classDeclaration)) {
                     for (var _i = 0, _a = classDeclaration.members; _i < _a.length; _i++) {
                         var member = _a[_i];
-                        if (!ts.hasModifier(member, 32) && hasNonBindableDynamicName(member)) {
+                        // Only process instance properties with computed names here.
+                        // Static properties cannot be in conflict with indexers,
+                        // and properties with literal names were already checked.
+                        if (!ts.hasModifier(member, 32 /* Static */) && hasNonBindableDynamicName(member)) {
                             var symbol = getSymbolOfNode(member);
                             var propType = getTypeOfSymbol(symbol);
-                            checkIndexConstraintForProperty(symbol, propType, type, declaredStringIndexer, stringIndexType, 0);
-                            checkIndexConstraintForProperty(symbol, propType, type, declaredNumberIndexer, numberIndexType, 1);
+                            checkIndexConstraintForProperty(symbol, propType, type, declaredStringIndexer, stringIndexType, 0 /* String */);
+                            checkIndexConstraintForProperty(symbol, propType, type, declaredNumberIndexer, numberIndexType, 1 /* Number */);
                         }
                     }
                 }
@@ -41632,38 +51044,46 @@ var ts;
             var errorNode;
             if (stringIndexType && numberIndexType) {
                 errorNode = declaredNumberIndexer || declaredStringIndexer;
-                if (!errorNode && (ts.getObjectFlags(type) & 2)) {
-                    var someBaseTypeHasBothIndexers = ts.forEach(getBaseTypes(type), function (base) { return getIndexTypeOfType(base, 0) && getIndexTypeOfType(base, 1); });
+                // condition 'errorNode === undefined' may appear if types does not declare nor string neither number indexer
+                if (!errorNode && (ts.getObjectFlags(type) & 2 /* Interface */)) {
+                    var someBaseTypeHasBothIndexers = ts.forEach(getBaseTypes(type), function (base) { return getIndexTypeOfType(base, 0 /* String */) && getIndexTypeOfType(base, 1 /* Number */); });
                     errorNode = someBaseTypeHasBothIndexers ? undefined : type.symbol.declarations[0];
                 }
             }
-            if (errorNode && !isTypeAssignableTo(numberIndexType, stringIndexType)) {
+            if (errorNode && !isTypeAssignableTo(numberIndexType, stringIndexType)) { // TODO: GH#18217
                 error(errorNode, ts.Diagnostics.Numeric_index_type_0_is_not_assignable_to_string_index_type_1, typeToString(numberIndexType), typeToString(stringIndexType));
             }
             function checkIndexConstraintForProperty(prop, propertyType, containingType, indexDeclaration, indexType, indexKind) {
+                // ESSymbol properties apply to neither string nor numeric indexers.
                 if (!indexType || ts.isKnownSymbol(prop)) {
                     return;
                 }
                 var propDeclaration = prop.valueDeclaration;
-                if (indexKind === 1 && !(propDeclaration ? isNumericName(ts.getNameOfDeclaration(propDeclaration)) : isNumericLiteralName(prop.escapedName))) {
+                // index is numeric and property name is not valid numeric literal
+                if (indexKind === 1 /* Number */ && !(propDeclaration ? isNumericName(ts.getNameOfDeclaration(propDeclaration)) : isNumericLiteralName(prop.escapedName))) {
                     return;
                 }
+                // perform property check if property or indexer is declared in 'type'
+                // this allows us to rule out cases when both property and indexer are inherited from the base class
                 var errorNode;
                 if (propDeclaration &&
-                    (propDeclaration.kind === 200 ||
-                        ts.getNameOfDeclaration(propDeclaration).kind === 147 ||
+                    (propDeclaration.kind === 200 /* BinaryExpression */ ||
+                        ts.getNameOfDeclaration(propDeclaration).kind === 147 /* ComputedPropertyName */ ||
                         prop.parent === containingType.symbol)) {
                     errorNode = propDeclaration;
                 }
                 else if (indexDeclaration) {
                     errorNode = indexDeclaration;
                 }
-                else if (ts.getObjectFlags(containingType) & 2) {
+                else if (ts.getObjectFlags(containingType) & 2 /* Interface */) {
+                    // for interfaces property and indexer might be inherited from different bases
+                    // check if any base class already has both property and indexer.
+                    // check should be performed only if 'type' is the first type that brings property\indexer together
                     var someBaseClassHasBothPropertyAndIndexer = ts.forEach(getBaseTypes(containingType), function (base) { return getPropertyOfObjectType(base, prop.escapedName) && getIndexTypeOfType(base, indexKind); });
                     errorNode = someBaseClassHasBothPropertyAndIndexer ? undefined : containingType.symbol.declarations[0];
                 }
                 if (errorNode && !isTypeAssignableTo(propertyType, indexType)) {
-                    var errorMessage = indexKind === 0
+                    var errorMessage = indexKind === 0 /* String */
                         ? ts.Diagnostics.Property_0_of_type_1_is_not_assignable_to_string_index_type_2
                         : ts.Diagnostics.Property_0_of_type_1_is_not_assignable_to_numeric_index_type_2;
                     error(errorNode, errorMessage, symbolToString(prop), typeToString(propertyType), typeToString(indexType));
@@ -41671,6 +51091,8 @@ var ts;
             }
         }
         function checkTypeNameIsReserved(name, message) {
+            // TS 1.0 spec (April 2014): 3.6.1
+            // The predefined type keywords are reserved and cannot be used as names of user defined types.
             switch (name.escapedText) {
                 case "any":
                 case "unknown":
@@ -41683,12 +51105,18 @@ var ts;
                     error(name, message, name.escapedText);
             }
         }
+        /**
+         * The name cannot be used as 'Object' of user defined types with special target.
+         */
         function checkClassNameCollisionWithObject(name) {
-            if (languageVersion === 1 && name.escapedText === "Object"
+            if (languageVersion === 1 /* ES5 */ && name.escapedText === "Object"
                 && moduleKind !== ts.ModuleKind.ES2015 && moduleKind !== ts.ModuleKind.ESNext) {
-                error(name, ts.Diagnostics.Class_name_cannot_be_Object_when_targeting_ES5_with_module_0, ts.ModuleKind[moduleKind]);
+                error(name, ts.Diagnostics.Class_name_cannot_be_Object_when_targeting_ES5_with_module_0, ts.ModuleKind[moduleKind]); // https://github.com/Microsoft/TypeScript/issues/17494
             }
         }
+        /**
+         * Check each type parameter and check that type parameters have no duplicate type parameter declarations
+         */
         function checkTypeParameters(typeParameterDeclarations) {
             if (typeParameterDeclarations) {
                 var seenDefault = false;
@@ -41711,6 +51139,7 @@ var ts;
                 }
             }
         }
+        /** Check that type parameter lists are identical across multiple declarations */
         function checkTypeParameterListsIdentical(symbol) {
             if (symbol.declarations.length === 1) {
                 return;
@@ -41724,9 +51153,10 @@ var ts;
                 }
                 var type = getDeclaredTypeOfSymbol(symbol);
                 if (!areTypeParametersIdentical(declarations, type.localTypeParameters)) {
+                    // Report an error on every conflicting declaration.
                     var name = symbolToString(symbol);
-                    for (var _i = 0, declarations_6 = declarations; _i < declarations_6.length; _i++) {
-                        var declaration = declarations_6[_i];
+                    for (var _i = 0, declarations_5 = declarations; _i < declarations_5.length; _i++) {
+                        var declaration = declarations_5[_i];
                         error(declaration.name, ts.Diagnostics.All_declarations_of_0_must_have_identical_type_parameters, name);
                     }
                 }
@@ -41735,8 +51165,9 @@ var ts;
         function areTypeParametersIdentical(declarations, targetParameters) {
             var maxTypeArgumentCount = ts.length(targetParameters);
             var minTypeArgumentCount = getMinTypeArgumentCount(targetParameters);
-            for (var _i = 0, declarations_7 = declarations; _i < declarations_7.length; _i++) {
-                var declaration = declarations_7[_i];
+            for (var _i = 0, declarations_6 = declarations; _i < declarations_6.length; _i++) {
+                var declaration = declarations_6[_i];
+                // If this declaration has too few or too many type parameters, we report an error
                 var sourceParameters = ts.getEffectiveTypeParameterDeclarations(declaration);
                 var numTypeParameters = sourceParameters.length;
                 if (numTypeParameters < minTypeArgumentCount || numTypeParameters > maxTypeArgumentCount) {
@@ -41745,16 +51176,23 @@ var ts;
                 for (var i = 0; i < numTypeParameters; i++) {
                     var source = sourceParameters[i];
                     var target = targetParameters[i];
+                    // If the type parameter node does not have the same as the resolved type
+                    // parameter at this position, we report an error.
                     if (source.name.escapedText !== target.symbol.escapedName) {
                         return false;
                     }
+                    // If the type parameter node does not have an identical constraint as the resolved
+                    // type parameter at this position, we report an error.
                     var sourceConstraint = source.constraint && getTypeFromTypeNode(source.constraint);
                     var targetConstraint = getConstraintFromTypeParameter(target);
                     if (sourceConstraint) {
+                        // relax check if later interface augmentation has no constraint
                         if (!targetConstraint || !isTypeIdenticalTo(sourceConstraint, targetConstraint)) {
                             return false;
                         }
                     }
+                    // If the type parameter node has a default and it is not identical to the default
+                    // for the type parameter at this position, we report an error.
                     var sourceDefault = source.default && getTypeFromTypeNode(source.default);
                     var targetDefault = getDefaultFromTypeParameter(target);
                     if (sourceDefault && targetDefault && !isTypeIdenticalTo(sourceDefault, targetDefault)) {
@@ -41774,7 +51212,7 @@ var ts;
             registerForUnusedIdentifiersCheck(node);
         }
         function checkClassDeclaration(node) {
-            if (!node.name && !ts.hasModifier(node, 512)) {
+            if (!node.name && !ts.hasModifier(node, 512 /* Default */)) {
                 grammarErrorOnFirstToken(node, ts.Diagnostics.A_class_declaration_without_the_default_modifier_must_have_a_name);
             }
             checkClassLikeDeclaration(node);
@@ -41788,7 +51226,7 @@ var ts;
                 checkTypeNameIsReserved(node.name, ts.Diagnostics.Class_name_cannot_be_0);
                 checkCollisionWithRequireExportsInGeneratedCode(node, node.name);
                 checkCollisionWithGlobalPromiseInGeneratedCode(node, node.name);
-                if (!(node.flags & 4194304)) {
+                if (!(node.flags & 4194304 /* Ambient */)) {
                     checkClassNameCollisionWithObject(node.name);
                 }
             }
@@ -41800,13 +51238,14 @@ var ts;
             var staticType = getTypeOfSymbol(symbol);
             checkTypeParameterListsIdentical(symbol);
             checkClassForDuplicateDeclarations(node);
-            if (!(node.flags & 4194304)) {
+            // Only check for reserved static identifiers on non-ambient context.
+            if (!(node.flags & 4194304 /* Ambient */)) {
                 checkClassForStaticPropertyNameConflicts(node);
             }
             var baseTypeNode = ts.getClassExtendsHeritageClauseElement(node);
             if (baseTypeNode) {
-                if (languageVersion < 2) {
-                    checkExternalEmitHelpers(baseTypeNode.parent, 1);
+                if (languageVersion < 2 /* ES2015 */) {
+                    checkExternalEmitHelpers(baseTypeNode.parent, 1 /* Extends */);
                 }
                 var baseTypes = getBaseTypes(type);
                 if (baseTypes.length && produceDiagnostics) {
@@ -41825,14 +51264,18 @@ var ts;
                         }
                     }
                     var baseWithThis = getTypeWithThisArgument(baseType_1, type.thisType);
-                    if (!checkTypeAssignableTo(typeWithThis, baseWithThis, undefined)) {
+                    if (!checkTypeAssignableTo(typeWithThis, baseWithThis, /*errorNode*/ undefined)) {
                         issueMemberSpecificError(node, typeWithThis, baseWithThis, ts.Diagnostics.Class_0_incorrectly_extends_base_class_1);
                     }
                     checkTypeAssignableTo(staticType, getTypeWithoutSignatures(staticBaseType), node.name || node, ts.Diagnostics.Class_static_side_0_incorrectly_extends_base_class_static_side_1);
-                    if (baseConstructorType.flags & 2162688 && !isMixinConstructorType(staticType)) {
+                    if (baseConstructorType.flags & 2162688 /* TypeVariable */ && !isMixinConstructorType(staticType)) {
                         error(node.name || node, ts.Diagnostics.A_mixin_class_must_have_a_constructor_with_a_single_rest_parameter_of_type_any);
                     }
-                    if (!(staticBaseType.symbol && staticBaseType.symbol.flags & 32) && !(baseConstructorType.flags & 2162688)) {
+                    if (!(staticBaseType.symbol && staticBaseType.symbol.flags & 32 /* Class */) && !(baseConstructorType.flags & 2162688 /* TypeVariable */)) {
+                        // When the static base type is a "class-like" constructor function (but not actually a class), we verify
+                        // that all instantiated base constructor signatures return the same type. We can simply compare the type
+                        // references (as opposed to checking the structure of the types) because elsewhere we have already checked
+                        // that the base type is a class or interface type (and not, for example, an anonymous object type).
                         var constructors = getInstantiatedConstructorsForTypeArguments(staticBaseType, baseTypeNode.typeArguments, baseTypeNode);
                         if (ts.forEach(constructors, function (sig) { return getReturnTypeOfSignature(sig) !== baseType_1; })) {
                             error(baseTypeNode.expression, ts.Diagnostics.Base_constructors_must_all_have_the_same_return_type);
@@ -41853,11 +51296,11 @@ var ts;
                         var t = getTypeFromTypeNode(typeRefNode);
                         if (t !== errorType) {
                             if (isValidBaseType(t)) {
-                                var genericDiag = t.symbol && t.symbol.flags & 32 ?
+                                var genericDiag = t.symbol && t.symbol.flags & 32 /* Class */ ?
                                     ts.Diagnostics.Class_0_incorrectly_implements_class_1_Did_you_mean_to_extend_1_and_inherit_its_members_as_a_subclass :
                                     ts.Diagnostics.Class_0_incorrectly_implements_interface_1;
                                 var baseWithThis = getTypeWithThisArgument(t, type.thisType);
-                                if (!checkTypeAssignableTo(typeWithThis, baseWithThis, undefined)) {
+                                if (!checkTypeAssignableTo(typeWithThis, baseWithThis, /*errorNode*/ undefined)) {
                                     issueMemberSpecificError(node, typeWithThis, baseWithThis, genericDiag);
                                 }
                             }
@@ -41875,8 +51318,9 @@ var ts;
             }
         }
         function issueMemberSpecificError(node, typeWithThis, baseWithThis, broadDiag) {
+            // iterate over all implemented properties and issue errors on each one which isn't compatible, rather than the class as a whole, if possible
             var issuedMemberError = false;
-            var _loop_8 = function (member) {
+            var _loop_6 = function (member) {
                 if (ts.hasStaticModifier(member)) {
                     return "continue";
                 }
@@ -41885,8 +51329,9 @@ var ts;
                     var prop = getPropertyOfType(typeWithThis, declaredProp.escapedName);
                     var baseProp = getPropertyOfType(baseWithThis, declaredProp.escapedName);
                     if (prop && baseProp) {
-                        var rootChain = function () { return ts.chainDiagnosticMessages(undefined, ts.Diagnostics.Property_0_in_type_1_is_not_assignable_to_the_same_property_in_base_type_2, symbolToString(declaredProp), typeToString(typeWithThis), typeToString(baseWithThis)); };
-                        if (!checkTypeAssignableTo(getTypeOfSymbol(prop), getTypeOfSymbol(baseProp), member.name || member, undefined, rootChain)) {
+                        var rootChain = function () { return ts.chainDiagnosticMessages(
+                        /*details*/ undefined, ts.Diagnostics.Property_0_in_type_1_is_not_assignable_to_the_same_property_in_base_type_2, symbolToString(declaredProp), typeToString(typeWithThis), typeToString(baseWithThis)); };
+                        if (!checkTypeAssignableTo(getTypeOfSymbol(prop), getTypeOfSymbol(baseProp), member.name || member, /*message*/ undefined, rootChain)) {
                             issuedMemberError = true;
                         }
                     }
@@ -41894,17 +51339,18 @@ var ts;
             };
             for (var _i = 0, _a = node.members; _i < _a.length; _i++) {
                 var member = _a[_i];
-                _loop_8(member);
+                _loop_6(member);
             }
             if (!issuedMemberError) {
+                // check again with diagnostics to generate a less-specific error
                 checkTypeAssignableTo(typeWithThis, baseWithThis, node.name || node, broadDiag);
             }
         }
         function checkBaseTypeAccessibility(type, node) {
-            var signatures = getSignaturesOfType(type, 1);
+            var signatures = getSignaturesOfType(type, 1 /* Construct */);
             if (signatures.length) {
                 var declaration = signatures[0].declaration;
-                if (declaration && ts.hasModifier(declaration, 8)) {
+                if (declaration && ts.hasModifier(declaration, 8 /* Private */)) {
                     var typeClassDeclaration = ts.getClassLikeDeclarationOfSymbol(type.symbol);
                     if (!isNodeWithinClass(node, typeClassDeclaration)) {
                         error(node, ts.Diagnostics.Cannot_extend_a_class_0_Class_constructor_is_marked_as_private, getFullyQualifiedName(type.symbol));
@@ -41913,29 +51359,52 @@ var ts;
             }
         }
         function getTargetSymbol(s) {
-            return ts.getCheckFlags(s) & 1 ? s.target : s;
+            // if symbol is instantiated its flags are not copied from the 'target'
+            // so we'll need to get back original 'target' symbol to work with correct set of flags
+            return ts.getCheckFlags(s) & 1 /* Instantiated */ ? s.target : s;
         }
         function getClassOrInterfaceDeclarationsOfSymbol(symbol) {
             return ts.filter(symbol.declarations, function (d) {
-                return d.kind === 235 || d.kind === 236;
+                return d.kind === 235 /* ClassDeclaration */ || d.kind === 236 /* InterfaceDeclaration */;
             });
         }
         function checkKindsOfPropertyMemberOverrides(type, baseType) {
+            // TypeScript 1.0 spec (April 2014): 8.2.3
+            // A derived class inherits all members from its base class it doesn't override.
+            // Inheritance means that a derived class implicitly contains all non - overridden members of the base class.
+            // Both public and private property members are inherited, but only public property members can be overridden.
+            // A property member in a derived class is said to override a property member in a base class
+            // when the derived class property member has the same name and kind(instance or static)
+            // as the base class property member.
+            // The type of an overriding property member must be assignable(section 3.8.4)
+            // to the type of the overridden property member, or otherwise a compile - time error occurs.
+            // Base class instance member functions can be overridden by derived class instance member functions,
+            // but not by other kinds of members.
+            // Base class instance member variables and accessors can be overridden by
+            // derived class instance member variables and accessors, but not by other kinds of members.
+            // NOTE: assignability is checked in checkClassDeclaration
             var baseProperties = getPropertiesOfType(baseType);
             for (var _i = 0, baseProperties_1 = baseProperties; _i < baseProperties_1.length; _i++) {
                 var baseProperty = baseProperties_1[_i];
                 var base = getTargetSymbol(baseProperty);
-                if (base.flags & 4194304) {
+                if (base.flags & 4194304 /* Prototype */) {
                     continue;
                 }
-                var derived = getTargetSymbol(getPropertyOfObjectType(type, base.escapedName));
+                var derived = getTargetSymbol(getPropertyOfObjectType(type, base.escapedName)); // TODO: GH#18217
                 var baseDeclarationFlags = ts.getDeclarationModifierFlagsFromSymbol(base);
                 ts.Debug.assert(!!derived, "derived should point to something, even if it is the base class' declaration.");
                 if (derived) {
+                    // In order to resolve whether the inherited method was overridden in the base class or not,
+                    // we compare the Symbols obtained. Since getTargetSymbol returns the symbol on the *uninstantiated*
+                    // type declaration, derived and base resolve to the same symbol even in the case of generic classes.
                     if (derived === base) {
+                        // derived class inherits base without override/redeclaration
                         var derivedClassDecl = ts.getClassLikeDeclarationOfSymbol(type.symbol);
-                        if (baseDeclarationFlags & 128 && (!derivedClassDecl || !ts.hasModifier(derivedClassDecl, 128))) {
-                            if (derivedClassDecl.kind === 205) {
+                        // It is an error to inherit an abstract member without implementing it or being declared abstract.
+                        // If there is no declaration for the derived class (as in the case of class expressions),
+                        // then the class cannot be declared abstract.
+                        if (baseDeclarationFlags & 128 /* Abstract */ && (!derivedClassDecl || !ts.hasModifier(derivedClassDecl, 128 /* Abstract */))) {
+                            if (derivedClassDecl.kind === 205 /* ClassExpression */) {
                                 error(derivedClassDecl, ts.Diagnostics.Non_abstract_class_expression_does_not_implement_inherited_abstract_member_0_from_class_1, symbolToString(baseProperty), typeToString(baseType));
                             }
                             else {
@@ -41944,23 +51413,26 @@ var ts;
                         }
                     }
                     else {
+                        // derived overrides base.
                         var derivedDeclarationFlags = ts.getDeclarationModifierFlagsFromSymbol(derived);
-                        if (baseDeclarationFlags & 8 || derivedDeclarationFlags & 8) {
+                        if (baseDeclarationFlags & 8 /* Private */ || derivedDeclarationFlags & 8 /* Private */) {
+                            // either base or derived property is private - not override, skip it
                             continue;
                         }
-                        if (isPrototypeProperty(base) || base.flags & 98308 && derived.flags & 98308) {
+                        if (isPrototypeProperty(base) || base.flags & 98308 /* PropertyOrAccessor */ && derived.flags & 98308 /* PropertyOrAccessor */) {
+                            // method is overridden with method or property/accessor is overridden with property/accessor - correct case
                             continue;
                         }
                         var errorMessage = void 0;
                         if (isPrototypeProperty(base)) {
-                            if (derived.flags & 98304) {
+                            if (derived.flags & 98304 /* Accessor */) {
                                 errorMessage = ts.Diagnostics.Class_0_defines_instance_member_function_1_but_extended_class_2_defines_it_as_instance_member_accessor;
                             }
                             else {
                                 errorMessage = ts.Diagnostics.Class_0_defines_instance_member_function_1_but_extended_class_2_defines_it_as_instance_member_property;
                             }
                         }
-                        else if (base.flags & 98304) {
+                        else if (base.flags & 98304 /* Accessor */) {
                             errorMessage = ts.Diagnostics.Class_0_defines_instance_member_accessor_1_but_extended_class_2_defines_it_as_instance_member_function;
                         }
                         else {
@@ -41994,7 +51466,7 @@ var ts;
                             ok = false;
                             var typeName1 = typeToString(existing.containingType);
                             var typeName2 = typeToString(base);
-                            var errorInfo = ts.chainDiagnosticMessages(undefined, ts.Diagnostics.Named_property_0_of_types_1_and_2_are_not_identical, symbolToString(prop), typeName1, typeName2);
+                            var errorInfo = ts.chainDiagnosticMessages(/*details*/ undefined, ts.Diagnostics.Named_property_0_of_types_1_and_2_are_not_identical, symbolToString(prop), typeName1, typeName2);
                             errorInfo = ts.chainDiagnosticMessages(errorInfo, ts.Diagnostics.Interface_0_cannot_simultaneously_extend_types_1_and_2, typeToString(type), typeName1, typeName2);
                             diagnostics.add(ts.createDiagnosticForNodeFromMessageChain(typeNode, errorInfo));
                         }
@@ -42004,7 +51476,7 @@ var ts;
             return ok;
         }
         function checkPropertyInitialization(node) {
-            if (!strictNullChecks || !strictPropertyInitialization || node.flags & 4194304) {
+            if (!strictNullChecks || !strictPropertyInitialization || node.flags & 4194304 /* Ambient */) {
                 return;
             }
             var constructor = findConstructorDeclaration(node);
@@ -42014,7 +51486,7 @@ var ts;
                     var propName = member.name;
                     if (ts.isIdentifier(propName)) {
                         var type = getTypeOfSymbol(getSymbolOfNode(member));
-                        if (!(type.flags & 3 || getFalsyFlags(type) & 8192)) {
+                        if (!(type.flags & 3 /* AnyOrUnknown */ || getFalsyFlags(type) & 8192 /* Undefined */)) {
                             if (!constructor || !isPropertyInitializedInConstructor(propName, type, constructor)) {
                                 error(member.name, ts.Diagnostics.Property_0_has_no_initializer_and_is_not_definitely_assigned_in_the_constructor, ts.declarationNameToString(propName));
                             }
@@ -42024,8 +51496,8 @@ var ts;
             }
         }
         function isInstancePropertyWithoutInitializer(node) {
-            return node.kind === 152 &&
-                !ts.hasModifier(node, 32 | 128) &&
+            return node.kind === 152 /* PropertyDeclaration */ &&
+                !ts.hasModifier(node, 32 /* Static */ | 128 /* Abstract */) &&
                 !node.exclamationToken &&
                 !node.initializer;
         }
@@ -42033,9 +51505,10 @@ var ts;
             var reference = ts.createPropertyAccess(ts.createThis(), propName);
             reference.flowNode = constructor.returnFlowNode;
             var flowType = getFlowTypeOfReference(reference, propType, getOptionalType(propType));
-            return !(getFalsyFlags(flowType) & 8192);
+            return !(getFalsyFlags(flowType) & 8192 /* Undefined */);
         }
         function checkInterfaceDeclaration(node) {
+            // Grammar checking
             if (!checkGrammarDecoratorsAndModifiers(node))
                 checkGrammarInterfaceDeclaration(node);
             checkTypeParameters(node.typeParameters);
@@ -42044,10 +51517,12 @@ var ts;
                 checkExportsOnMergedDeclarations(node);
                 var symbol = getSymbolOfNode(node);
                 checkTypeParameterListsIdentical(symbol);
-                var firstInterfaceDecl = ts.getDeclarationOfKind(symbol, 236);
+                // Only check this symbol once
+                var firstInterfaceDecl = ts.getDeclarationOfKind(symbol, 236 /* InterfaceDeclaration */);
                 if (node === firstInterfaceDecl) {
                     var type = getDeclaredTypeOfSymbol(symbol);
                     var typeWithThis = getTypeWithThisArgument(type);
+                    // run subsequent checks only if first set succeeded
                     if (checkInheritedPropertiesAreIdentical(type, node.name)) {
                         for (var _i = 0, _a = getBaseTypes(type); _i < _a.length; _i++) {
                             var baseType = _a[_i];
@@ -42071,6 +51546,7 @@ var ts;
             }
         }
         function checkTypeAliasDeclaration(node) {
+            // Grammar checking
             checkGrammarDecoratorsAndModifiers(node);
             checkTypeNameIsReserved(node.name, ts.Diagnostics.Type_alias_name_cannot_be_0);
             checkTypeParameters(node.typeParameters);
@@ -42079,8 +51555,8 @@ var ts;
         }
         function computeEnumMemberValues(node) {
             var nodeLinks = getNodeLinks(node);
-            if (!(nodeLinks.flags & 16384)) {
-                nodeLinks.flags |= 16384;
+            if (!(nodeLinks.flags & 16384 /* EnumValuesComputed */)) {
+                nodeLinks.flags |= 16384 /* EnumValuesComputed */;
                 var autoValue = 0;
                 for (var _i = 0, _a = node.members; _i < _a.length; _i++) {
                     var member = _a[_i];
@@ -42103,9 +51579,15 @@ var ts;
             if (member.initializer) {
                 return computeConstantValue(member);
             }
-            if (member.parent.flags & 4194304 && !ts.isConst(member.parent)) {
+            // In ambient enum declarations that specify no const modifier, enum member declarations that omit
+            // a value are considered computed members (as opposed to having auto-incremented values).
+            if (member.parent.flags & 4194304 /* Ambient */ && !ts.isConst(member.parent)) {
                 return undefined;
             }
+            // If the member declaration specifies no value, the member is considered a constant enum member.
+            // If the member is the first member in the enum declaration, it is assigned the value zero.
+            // Otherwise, it is assigned the value of the immediately preceding member plus one, and an error
+            // occurs if the immediately preceding member is not a constant enum member.
             if (autoValue !== undefined) {
                 return autoValue;
             }
@@ -42116,7 +51598,7 @@ var ts;
             var enumKind = getEnumKind(getSymbolOfNode(member.parent));
             var isConstEnum = ts.isConst(member.parent);
             var initializer = member.initializer;
-            var value = enumKind === 1 && !isLiteralEnumMember(member) ? undefined : evaluate(initializer);
+            var value = enumKind === 1 /* Literal */ && !isLiteralEnumMember(member) ? undefined : evaluate(initializer);
             if (value !== undefined) {
                 if (isConstEnum && typeof value === "number" && !isFinite(value)) {
                     error(initializer, isNaN(value) ?
@@ -42124,76 +51606,77 @@ var ts;
                         ts.Diagnostics.const_enum_member_initializer_was_evaluated_to_a_non_finite_value);
                 }
             }
-            else if (enumKind === 1) {
+            else if (enumKind === 1 /* Literal */) {
                 error(initializer, ts.Diagnostics.Computed_values_are_not_permitted_in_an_enum_with_string_valued_members);
                 return 0;
             }
             else if (isConstEnum) {
                 error(initializer, ts.Diagnostics.In_const_enum_declarations_member_initializer_must_be_constant_expression);
             }
-            else if (member.parent.flags & 4194304) {
+            else if (member.parent.flags & 4194304 /* Ambient */) {
                 error(initializer, ts.Diagnostics.In_ambient_enum_declarations_member_initializer_must_be_constant_expression);
             }
             else {
-                checkTypeAssignableTo(checkExpression(initializer), getDeclaredTypeOfSymbol(getSymbolOfNode(member.parent)), initializer, undefined);
+                // Only here do we need to check that the initializer is assignable to the enum type.
+                checkTypeAssignableTo(checkExpression(initializer), getDeclaredTypeOfSymbol(getSymbolOfNode(member.parent)), initializer, /*headMessage*/ undefined);
             }
             return value;
             function evaluate(expr) {
                 switch (expr.kind) {
-                    case 198:
-                        var value_2 = evaluate(expr.operand);
-                        if (typeof value_2 === "number") {
+                    case 198 /* PrefixUnaryExpression */:
+                        var value_1 = evaluate(expr.operand);
+                        if (typeof value_1 === "number") {
                             switch (expr.operator) {
-                                case 37: return value_2;
-                                case 38: return -value_2;
-                                case 52: return ~value_2;
+                                case 37 /* PlusToken */: return value_1;
+                                case 38 /* MinusToken */: return -value_1;
+                                case 52 /* TildeToken */: return ~value_1;
                             }
                         }
                         break;
-                    case 200:
+                    case 200 /* BinaryExpression */:
                         var left = evaluate(expr.left);
                         var right = evaluate(expr.right);
                         if (typeof left === "number" && typeof right === "number") {
                             switch (expr.operatorToken.kind) {
-                                case 49: return left | right;
-                                case 48: return left & right;
-                                case 46: return left >> right;
-                                case 47: return left >>> right;
-                                case 45: return left << right;
-                                case 50: return left ^ right;
-                                case 39: return left * right;
-                                case 41: return left / right;
-                                case 37: return left + right;
-                                case 38: return left - right;
-                                case 42: return left % right;
-                                case 40: return Math.pow(left, right);
+                                case 49 /* BarToken */: return left | right;
+                                case 48 /* AmpersandToken */: return left & right;
+                                case 46 /* GreaterThanGreaterThanToken */: return left >> right;
+                                case 47 /* GreaterThanGreaterThanGreaterThanToken */: return left >>> right;
+                                case 45 /* LessThanLessThanToken */: return left << right;
+                                case 50 /* CaretToken */: return left ^ right;
+                                case 39 /* AsteriskToken */: return left * right;
+                                case 41 /* SlashToken */: return left / right;
+                                case 37 /* PlusToken */: return left + right;
+                                case 38 /* MinusToken */: return left - right;
+                                case 42 /* PercentToken */: return left % right;
+                                case 40 /* AsteriskAsteriskToken */: return Math.pow(left, right);
                             }
                         }
-                        else if (typeof left === "string" && typeof right === "string" && expr.operatorToken.kind === 37) {
+                        else if (typeof left === "string" && typeof right === "string" && expr.operatorToken.kind === 37 /* PlusToken */) {
                             return left + right;
                         }
                         break;
-                    case 9:
+                    case 9 /* StringLiteral */:
                         return expr.text;
-                    case 8:
+                    case 8 /* NumericLiteral */:
                         checkGrammarNumericLiteral(expr);
                         return +expr.text;
-                    case 191:
+                    case 191 /* ParenthesizedExpression */:
                         return evaluate(expr.expression);
-                    case 71:
+                    case 71 /* Identifier */:
                         var identifier = expr;
                         if (isInfinityOrNaNString(identifier.escapedText)) {
                             return +(identifier.escapedText);
                         }
                         return ts.nodeIsMissing(expr) ? 0 : evaluateEnumMember(expr, getSymbolOfNode(member.parent), identifier.escapedText);
-                    case 186:
-                    case 185:
+                    case 186 /* ElementAccessExpression */:
+                    case 185 /* PropertyAccessExpression */:
                         var ex = expr;
                         if (isConstantMemberAccess(ex)) {
                             var type = getTypeOfExpression(ex.expression);
-                            if (type.symbol && type.symbol.flags & 384) {
+                            if (type.symbol && type.symbol.flags & 384 /* Enum */) {
                                 var name = void 0;
-                                if (ex.kind === 185) {
+                                if (ex.kind === 185 /* PropertyAccessExpression */) {
                                     name = ex.name.escapedText;
                                 }
                                 else {
@@ -42224,15 +51707,16 @@ var ts;
             }
         }
         function isConstantMemberAccess(node) {
-            return node.kind === 71 ||
-                node.kind === 185 && isConstantMemberAccess(node.expression) ||
-                node.kind === 186 && isConstantMemberAccess(node.expression) &&
-                    node.argumentExpression.kind === 9;
+            return node.kind === 71 /* Identifier */ ||
+                node.kind === 185 /* PropertyAccessExpression */ && isConstantMemberAccess(node.expression) ||
+                node.kind === 186 /* ElementAccessExpression */ && isConstantMemberAccess(node.expression) &&
+                    node.argumentExpression.kind === 9 /* StringLiteral */;
         }
         function checkEnumDeclaration(node) {
             if (!produceDiagnostics) {
                 return;
             }
+            // Grammar checking
             checkGrammarDecoratorsAndModifiers(node);
             checkTypeNameIsReserved(node.name, ts.Diagnostics.Enum_name_cannot_be_0);
             checkCollisionWithRequireExportsInGeneratedCode(node, node.name);
@@ -42240,13 +51724,20 @@ var ts;
             checkExportsOnMergedDeclarations(node);
             computeEnumMemberValues(node);
             var enumIsConst = ts.isConst(node);
-            if (compilerOptions.isolatedModules && enumIsConst && node.flags & 4194304) {
+            if (compilerOptions.isolatedModules && enumIsConst && node.flags & 4194304 /* Ambient */) {
                 error(node.name, ts.Diagnostics.Ambient_const_enums_are_not_allowed_when_the_isolatedModules_flag_is_provided);
             }
+            // Spec 2014 - Section 9.3:
+            // It isn't possible for one enum declaration to continue the automatic numbering sequence of another,
+            // and when an enum type has multiple declarations, only one declaration is permitted to omit a value
+            // for the first member.
+            //
+            // Only perform this check once per symbol
             var enumSymbol = getSymbolOfNode(node);
             var firstDeclaration = ts.getDeclarationOfKind(enumSymbol, node.kind);
             if (node === firstDeclaration) {
                 if (enumSymbol.declarations.length > 1) {
+                    // check that const is placed\omitted on all enum declarations
                     ts.forEach(enumSymbol.declarations, function (decl) {
                         if (ts.isConstEnumDeclaration(decl) !== enumIsConst) {
                             error(ts.getNameOfDeclaration(decl), ts.Diagnostics.Enum_declarations_must_all_be_const_or_non_const);
@@ -42255,7 +51746,8 @@ var ts;
                 }
                 var seenEnumMissingInitialInitializer_1 = false;
                 ts.forEach(enumSymbol.declarations, function (declaration) {
-                    if (declaration.kind !== 238) {
+                    // return true if we hit a violation of the rule, false otherwise
+                    if (declaration.kind !== 238 /* EnumDeclaration */) {
                         return false;
                     }
                     var enumDeclaration = declaration;
@@ -42276,11 +51768,11 @@ var ts;
         }
         function getFirstNonAmbientClassOrFunctionDeclaration(symbol) {
             var declarations = symbol.declarations;
-            for (var _i = 0, declarations_8 = declarations; _i < declarations_8.length; _i++) {
-                var declaration = declarations_8[_i];
-                if ((declaration.kind === 235 ||
-                    (declaration.kind === 234 && ts.nodeIsPresent(declaration.body))) &&
-                    !(declaration.flags & 4194304)) {
+            for (var _i = 0, declarations_7 = declarations; _i < declarations_7.length; _i++) {
+                var declaration = declarations_7[_i];
+                if ((declaration.kind === 235 /* ClassDeclaration */ ||
+                    (declaration.kind === 234 /* FunctionDeclaration */ && ts.nodeIsPresent(declaration.body))) &&
+                    !(declaration.flags & 4194304 /* Ambient */)) {
                     return declaration;
                 }
             }
@@ -42301,8 +51793,9 @@ var ts;
         }
         function checkModuleDeclaration(node) {
             if (produceDiagnostics) {
+                // Grammar checking
                 var isGlobalAugmentation = ts.isGlobalScopeAugmentation(node);
-                var inAmbientContext = node.flags & 4194304;
+                var inAmbientContext = node.flags & 4194304 /* Ambient */;
                 if (isGlobalAugmentation && !inAmbientContext) {
                     error(node.name, ts.Diagnostics.Augmentations_for_the_global_scope_should_have_declare_modifier_unless_they_appear_in_already_ambient_context);
                 }
@@ -42311,10 +51804,11 @@ var ts;
                     ? ts.Diagnostics.An_ambient_module_declaration_is_only_allowed_at_the_top_level_in_a_file
                     : ts.Diagnostics.A_namespace_declaration_is_only_allowed_in_a_namespace_or_module;
                 if (checkGrammarModuleElementContext(node, contextErrorMessage)) {
+                    // If we hit a module declaration in an illegal context, just bail out to avoid cascading errors.
                     return;
                 }
                 if (!checkGrammarDecoratorsAndModifiers(node)) {
-                    if (!inAmbientContext && node.name.kind === 9) {
+                    if (!inAmbientContext && node.name.kind === 9 /* StringLiteral */) {
                         grammarErrorOnNode(node.name, ts.Diagnostics.Only_ambient_modules_can_use_quoted_names);
                     }
                 }
@@ -42324,7 +51818,8 @@ var ts;
                 }
                 checkExportsOnMergedDeclarations(node);
                 var symbol = getSymbolOfNode(node);
-                if (symbol.flags & 512
+                // The following checks only apply on a non-ambient instantiated module declaration.
+                if (symbol.flags & 512 /* ValueModule */
                     && symbol.declarations.length > 1
                     && !inAmbientContext
                     && isInstantiatedModule(node, !!compilerOptions.preserveConstEnums || !!compilerOptions.isolatedModules)) {
@@ -42337,15 +51832,22 @@ var ts;
                             error(node.name, ts.Diagnostics.A_namespace_declaration_cannot_be_located_prior_to_a_class_or_function_with_which_it_is_merged);
                         }
                     }
-                    var mergedClass = ts.getDeclarationOfKind(symbol, 235);
+                    // if the module merges with a class declaration in the same lexical scope,
+                    // we need to track this to ensure the correct emit.
+                    var mergedClass = ts.getDeclarationOfKind(symbol, 235 /* ClassDeclaration */);
                     if (mergedClass &&
                         inSameLexicalScope(node, mergedClass)) {
-                        getNodeLinks(node).flags |= 32768;
+                        getNodeLinks(node).flags |= 32768 /* LexicalModuleMergesWithClass */;
                     }
                 }
                 if (isAmbientExternalModule) {
                     if (ts.isExternalModuleAugmentation(node)) {
-                        var checkBody = isGlobalAugmentation || (getSymbolOfNode(node).flags & 33554432);
+                        // body of the augmentation should be checked for consistency only if augmentation was applied to its target (either global scope or module)
+                        // otherwise we'll be swamped in cascading errors.
+                        // We can detect if augmentation was applied using following rules:
+                        // - augmentation for a global scope is always applied
+                        // - augmentation for some external module is applied if symbol for augmentation is merged (it was combined with target module).
+                        var checkBody = isGlobalAugmentation || (getSymbolOfNode(node).flags & 33554432 /* Transient */);
                         if (checkBody && node.body) {
                             for (var _i = 0, _a = node.body.statements; _i < _a.length; _i++) {
                                 var statement = _a[_i];
@@ -42366,6 +51868,8 @@ var ts;
                             error(node.name, ts.Diagnostics.Augmentations_for_the_global_scope_can_only_be_directly_nested_in_external_modules_or_ambient_module_declarations);
                         }
                         else {
+                            // Node is not an augmentation and is not located on the script level.
+                            // This means that this is declaration of ambient module that is located in other module or namespace which is prohibited.
                             error(node.name, ts.Diagnostics.Ambient_modules_cannot_be_nested_in_other_modules_or_namespaces);
                         }
                     }
@@ -42380,43 +51884,51 @@ var ts;
         }
         function checkModuleAugmentationElement(node, isGlobalAugmentation) {
             switch (node.kind) {
-                case 214:
+                case 214 /* VariableStatement */:
+                    // error each individual name in variable statement instead of marking the entire variable statement
                     for (var _i = 0, _a = node.declarationList.declarations; _i < _a.length; _i++) {
                         var decl = _a[_i];
                         checkModuleAugmentationElement(decl, isGlobalAugmentation);
                     }
                     break;
-                case 249:
-                case 250:
+                case 249 /* ExportAssignment */:
+                case 250 /* ExportDeclaration */:
                     grammarErrorOnFirstToken(node, ts.Diagnostics.Exports_and_export_assignments_are_not_permitted_in_module_augmentations);
                     break;
-                case 243:
-                case 244:
+                case 243 /* ImportEqualsDeclaration */:
+                case 244 /* ImportDeclaration */:
                     grammarErrorOnFirstToken(node, ts.Diagnostics.Imports_are_not_permitted_in_module_augmentations_Consider_moving_them_to_the_enclosing_external_module);
                     break;
-                case 182:
-                case 232:
+                case 182 /* BindingElement */:
+                case 232 /* VariableDeclaration */:
                     var name = node.name;
                     if (ts.isBindingPattern(name)) {
                         for (var _b = 0, _c = name.elements; _b < _c.length; _b++) {
                             var el = _c[_b];
+                            // mark individual names in binding pattern
                             checkModuleAugmentationElement(el, isGlobalAugmentation);
                         }
                         break;
                     }
-                case 235:
-                case 238:
-                case 234:
-                case 236:
-                case 239:
-                case 237:
+                // falls through
+                case 235 /* ClassDeclaration */:
+                case 238 /* EnumDeclaration */:
+                case 234 /* FunctionDeclaration */:
+                case 236 /* InterfaceDeclaration */:
+                case 239 /* ModuleDeclaration */:
+                case 237 /* TypeAliasDeclaration */:
                     if (isGlobalAugmentation) {
                         return;
                     }
                     var symbol = getSymbolOfNode(node);
                     if (symbol) {
-                        var reportError = !(symbol.flags & 33554432);
+                        // module augmentations cannot introduce new names on the top level scope of the module
+                        // this is done it two steps
+                        // 1. quick check - if symbol for node is not merged - this is local symbol to this augmentation - report error
+                        // 2. main check - report error if value declaration of the parent symbol is module augmentation)
+                        var reportError = !(symbol.flags & 33554432 /* Transient */);
                         if (!reportError) {
+                            // symbol should not originate in augmentation
                             reportError = ts.isExternalModuleAugmentation(symbol.parent.declarations[0]);
                         }
                     }
@@ -42425,38 +51937,45 @@ var ts;
         }
         function getFirstIdentifier(node) {
             switch (node.kind) {
-                case 71:
+                case 71 /* Identifier */:
                     return node;
-                case 146:
+                case 146 /* QualifiedName */:
                     do {
                         node = node.left;
-                    } while (node.kind !== 71);
+                    } while (node.kind !== 71 /* Identifier */);
                     return node;
-                case 185:
+                case 185 /* PropertyAccessExpression */:
                     do {
                         node = node.expression;
-                    } while (node.kind !== 71);
+                    } while (node.kind !== 71 /* Identifier */);
                     return node;
             }
         }
         function checkExternalImportOrExportDeclaration(node) {
             var moduleName = ts.getExternalModuleName(node);
             if (!moduleName || ts.nodeIsMissing(moduleName)) {
+                // Should be a parse error.
                 return false;
             }
             if (!ts.isStringLiteral(moduleName)) {
                 error(moduleName, ts.Diagnostics.String_literal_expected);
                 return false;
             }
-            var inAmbientExternalModule = node.parent.kind === 240 && ts.isAmbientModule(node.parent.parent);
-            if (node.parent.kind !== 274 && !inAmbientExternalModule) {
-                error(moduleName, node.kind === 250 ?
+            var inAmbientExternalModule = node.parent.kind === 240 /* ModuleBlock */ && ts.isAmbientModule(node.parent.parent);
+            if (node.parent.kind !== 274 /* SourceFile */ && !inAmbientExternalModule) {
+                error(moduleName, node.kind === 250 /* ExportDeclaration */ ?
                     ts.Diagnostics.Export_declarations_are_not_permitted_in_a_namespace :
                     ts.Diagnostics.Import_declarations_in_a_namespace_cannot_reference_a_module);
                 return false;
             }
             if (inAmbientExternalModule && ts.isExternalModuleNameRelative(moduleName.text)) {
+                // we have already reported errors on top level imports\exports in external module augmentations in checkModuleDeclaration
+                // no need to do this again.
                 if (!isTopLevelInExternalModuleAugmentation(node)) {
+                    // TypeScript 1.0 spec (April 2013): 12.1.6
+                    // An ExternalImportDeclaration in an AmbientExternalModuleDeclaration may reference
+                    // other external modules only through top - level external module names.
+                    // Relative external module names are not permitted.
                     error(node, ts.Diagnostics.Import_or_export_declaration_in_an_ambient_module_declaration_cannot_reference_module_through_relative_module_name);
                     return false;
                 }
@@ -42467,19 +51986,26 @@ var ts;
             var symbol = getSymbolOfNode(node);
             var target = resolveAlias(symbol);
             if (target !== unknownSymbol) {
-                var excludedMeanings = (symbol.flags & (67216319 | 1048576) ? 67216319 : 0) |
-                    (symbol.flags & 67901928 ? 67901928 : 0) |
-                    (symbol.flags & 1920 ? 1920 : 0);
+                // For external modules symbol represent local symbol for an alias.
+                // This local symbol will merge any other local declarations (excluding other aliases)
+                // and symbol.flags will contains combined representation for all merged declaration.
+                // Based on symbol.flags we can compute a set of excluded meanings (meaning that resolved alias should not have,
+                // otherwise it will conflict with some local declaration). Note that in addition to normal flags we include matching SymbolFlags.Export*
+                // in order to prevent collisions with declarations that were exported from the current module (they still contribute to local names).
+                var excludedMeanings = (symbol.flags & (67216319 /* Value */ | 1048576 /* ExportValue */) ? 67216319 /* Value */ : 0) |
+                    (symbol.flags & 67901928 /* Type */ ? 67901928 /* Type */ : 0) |
+                    (symbol.flags & 1920 /* Namespace */ ? 1920 /* Namespace */ : 0);
                 if (target.flags & excludedMeanings) {
-                    var message = node.kind === 252 ?
+                    var message = node.kind === 252 /* ExportSpecifier */ ?
                         ts.Diagnostics.Export_declaration_conflicts_with_exported_declaration_of_0 :
                         ts.Diagnostics.Import_declaration_conflicts_with_local_declaration_of_0;
                     error(node, message, symbolToString(symbol));
                 }
+                // Don't allow to re-export something with no value side when `--isolatedModules` is set.
                 if (compilerOptions.isolatedModules
-                    && node.kind === 252
-                    && !(target.flags & 67216319)
-                    && !(node.flags & 4194304)) {
+                    && node.kind === 252 /* ExportSpecifier */
+                    && !(target.flags & 67216319 /* Value */)
+                    && !(node.flags & 4194304 /* Ambient */)) {
                     error(node, ts.Diagnostics.Cannot_re_export_a_type_when_the_isolatedModules_flag_is_provided);
                 }
             }
@@ -42491,6 +52017,7 @@ var ts;
         }
         function checkImportDeclaration(node) {
             if (checkGrammarModuleElementContext(node, ts.Diagnostics.An_import_declaration_can_only_be_used_in_a_namespace_or_module)) {
+                // If we hit an import declaration in an illegal context, just bail out to avoid cascading errors.
                 return;
             }
             if (!checkGrammarDecoratorsAndModifiers(node) && ts.hasModifiers(node)) {
@@ -42503,7 +52030,7 @@ var ts;
                         checkImportBinding(importClause);
                     }
                     if (importClause.namedBindings) {
-                        if (importClause.namedBindings.kind === 246) {
+                        if (importClause.namedBindings.kind === 246 /* NamespaceImport */) {
                             checkImportBinding(importClause.namedBindings);
                         }
                         else {
@@ -42518,30 +52045,33 @@ var ts;
         }
         function checkImportEqualsDeclaration(node) {
             if (checkGrammarModuleElementContext(node, ts.Diagnostics.An_import_declaration_can_only_be_used_in_a_namespace_or_module)) {
+                // If we hit an import declaration in an illegal context, just bail out to avoid cascading errors.
                 return;
             }
             checkGrammarDecoratorsAndModifiers(node);
             if (ts.isInternalModuleImportEqualsDeclaration(node) || checkExternalImportOrExportDeclaration(node)) {
                 checkImportBinding(node);
-                if (ts.hasModifier(node, 1)) {
+                if (ts.hasModifier(node, 1 /* Export */)) {
                     markExportAsReferenced(node);
                 }
-                if (node.moduleReference.kind !== 254) {
+                if (node.moduleReference.kind !== 254 /* ExternalModuleReference */) {
                     var target = resolveAlias(getSymbolOfNode(node));
                     if (target !== unknownSymbol) {
-                        if (target.flags & 67216319) {
+                        if (target.flags & 67216319 /* Value */) {
+                            // Target is a value symbol, check that it is not hidden by a local declaration with the same name
                             var moduleName = getFirstIdentifier(node.moduleReference);
-                            if (!(resolveEntityName(moduleName, 67216319 | 1920).flags & 1920)) {
+                            if (!(resolveEntityName(moduleName, 67216319 /* Value */ | 1920 /* Namespace */).flags & 1920 /* Namespace */)) {
                                 error(moduleName, ts.Diagnostics.Module_0_is_hidden_by_a_local_declaration_with_the_same_name, ts.declarationNameToString(moduleName));
                             }
                         }
-                        if (target.flags & 67901928) {
+                        if (target.flags & 67901928 /* Type */) {
                             checkTypeNameIsReserved(node.name, ts.Diagnostics.Import_name_cannot_be_0);
                         }
                     }
                 }
                 else {
-                    if (moduleKind >= ts.ModuleKind.ES2015 && !(node.flags & 4194304)) {
+                    if (moduleKind >= ts.ModuleKind.ES2015 && !(node.flags & 4194304 /* Ambient */)) {
+                        // Import equals declaration is deprecated in es6 or above
                         grammarErrorOnNode(node, ts.Diagnostics.Import_assignment_cannot_be_used_when_targeting_ECMAScript_modules_Consider_using_import_Asterisk_as_ns_from_mod_import_a_from_mod_import_d_from_mod_or_another_module_format_instead);
                     }
                 }
@@ -42549,6 +52079,7 @@ var ts;
         }
         function checkExportDeclaration(node) {
             if (checkGrammarModuleElementContext(node, ts.Diagnostics.An_export_declaration_can_only_be_used_in_a_module)) {
+                // If we hit an export in an illegal context, just bail out to avoid cascading errors.
                 return;
             }
             if (!checkGrammarDecoratorsAndModifiers(node) && ts.hasModifiers(node)) {
@@ -42556,27 +52087,30 @@ var ts;
             }
             if (!node.moduleSpecifier || checkExternalImportOrExportDeclaration(node)) {
                 if (node.exportClause) {
+                    // export { x, y }
+                    // export { x, y } from "foo"
                     ts.forEach(node.exportClause.elements, checkExportSpecifier);
-                    var inAmbientExternalModule = node.parent.kind === 240 && ts.isAmbientModule(node.parent.parent);
-                    var inAmbientNamespaceDeclaration = !inAmbientExternalModule && node.parent.kind === 240 &&
-                        !node.moduleSpecifier && node.flags & 4194304;
-                    if (node.parent.kind !== 274 && !inAmbientExternalModule && !inAmbientNamespaceDeclaration) {
+                    var inAmbientExternalModule = node.parent.kind === 240 /* ModuleBlock */ && ts.isAmbientModule(node.parent.parent);
+                    var inAmbientNamespaceDeclaration = !inAmbientExternalModule && node.parent.kind === 240 /* ModuleBlock */ &&
+                        !node.moduleSpecifier && node.flags & 4194304 /* Ambient */;
+                    if (node.parent.kind !== 274 /* SourceFile */ && !inAmbientExternalModule && !inAmbientNamespaceDeclaration) {
                         error(node, ts.Diagnostics.Export_declarations_are_not_permitted_in_a_namespace);
                     }
                 }
                 else {
+                    // export * from "foo"
                     var moduleSymbol_2 = resolveExternalModuleName(node, node.moduleSpecifier);
                     if (moduleSymbol_2 && hasExportAssignmentSymbol(moduleSymbol_2)) {
                         error(node.moduleSpecifier, ts.Diagnostics.Module_0_uses_export_and_cannot_be_used_with_export_Asterisk, symbolToString(moduleSymbol_2));
                     }
                     if (moduleKind !== ts.ModuleKind.System && moduleKind !== ts.ModuleKind.ES2015 && moduleKind !== ts.ModuleKind.ESNext) {
-                        checkExternalEmitHelpers(node, 32768);
+                        checkExternalEmitHelpers(node, 32768 /* ExportStar */);
                     }
                 }
             }
         }
         function checkGrammarModuleElementContext(node, errorMessage) {
-            var isInAppropriateContext = node.parent.kind === 274 || node.parent.kind === 240 || node.parent.kind === 239;
+            var isInAppropriateContext = node.parent.kind === 274 /* SourceFile */ || node.parent.kind === 240 /* ModuleBlock */ || node.parent.kind === 239 /* ModuleDeclaration */;
             if (!isInAppropriateContext) {
                 grammarErrorOnFirstToken(node, errorMessage);
             }
@@ -42585,11 +52119,13 @@ var ts;
         function checkExportSpecifier(node) {
             checkAliasSymbol(node);
             if (compilerOptions.declaration) {
-                collectLinkedAliases(node.propertyName || node.name, true);
+                collectLinkedAliases(node.propertyName || node.name, /*setVisibility*/ true);
             }
             if (!node.parent.parent.moduleSpecifier) {
                 var exportedName = node.propertyName || node.name;
-                var symbol = resolveName(exportedName, exportedName.escapedText, 67216319 | 67901928 | 1920 | 2097152, undefined, undefined, true);
+                // find immediate value referenced by exported name (SymbolFlags.Alias is set so we don't chase down aliases)
+                var symbol = resolveName(exportedName, exportedName.escapedText, 67216319 /* Value */ | 67901928 /* Type */ | 1920 /* Namespace */ | 2097152 /* Alias */, 
+                /*nameNotFoundMessage*/ undefined, /*nameArg*/ undefined, /*isUse*/ true);
                 if (symbol && (symbol === undefinedSymbol || isGlobalSourceFile(getDeclarationContainer(symbol.declarations[0])))) {
                     error(exportedName, ts.Diagnostics.Cannot_export_0_Only_local_declarations_can_be_exported_from_a_module, ts.idText(exportedName));
                 }
@@ -42600,10 +52136,11 @@ var ts;
         }
         function checkExportAssignment(node) {
             if (checkGrammarModuleElementContext(node, ts.Diagnostics.An_export_assignment_can_only_be_used_in_a_module)) {
+                // If we hit an export assignment in an illegal context, just bail out to avoid cascading errors.
                 return;
             }
-            var container = node.parent.kind === 274 ? node.parent : node.parent.parent;
-            if (container.kind === 239 && !ts.isAmbientModule(container)) {
+            var container = node.parent.kind === 274 /* SourceFile */ ? node.parent : node.parent.parent;
+            if (container.kind === 239 /* ModuleDeclaration */ && !ts.isAmbientModule(container)) {
                 if (node.isExportEquals) {
                     error(node, ts.Diagnostics.An_export_assignment_cannot_be_used_in_a_namespace);
                 }
@@ -42612,27 +52149,30 @@ var ts;
                 }
                 return;
             }
+            // Grammar checking
             if (!checkGrammarDecoratorsAndModifiers(node) && ts.hasModifiers(node)) {
                 grammarErrorOnFirstToken(node, ts.Diagnostics.An_export_assignment_cannot_have_modifiers);
             }
-            if (node.expression.kind === 71) {
+            if (node.expression.kind === 71 /* Identifier */) {
                 markExportAsReferenced(node);
                 if (compilerOptions.declaration) {
-                    collectLinkedAliases(node.expression, true);
+                    collectLinkedAliases(node.expression, /*setVisibility*/ true);
                 }
             }
             else {
                 checkExpressionCached(node.expression);
             }
             checkExternalModuleExports(container);
-            if ((node.flags & 4194304) && !ts.isEntityNameExpression(node.expression)) {
+            if ((node.flags & 4194304 /* Ambient */) && !ts.isEntityNameExpression(node.expression)) {
                 grammarErrorOnNode(node.expression, ts.Diagnostics.The_expression_of_an_export_assignment_must_be_an_identifier_or_qualified_name_in_an_ambient_context);
             }
-            if (node.isExportEquals && !(node.flags & 4194304)) {
+            if (node.isExportEquals && !(node.flags & 4194304 /* Ambient */)) {
                 if (moduleKind >= ts.ModuleKind.ES2015) {
+                    // export assignment is not supported in es6 modules
                     grammarErrorOnNode(node, ts.Diagnostics.Export_assignment_cannot_be_used_when_targeting_ECMAScript_modules_Consider_using_export_default_or_another_module_format_instead);
                 }
                 else if (moduleKind === ts.ModuleKind.System) {
+                    // system modules does not support export assignment
                     grammarErrorOnNode(node, ts.Diagnostics.Export_assignment_is_not_supported_when_module_flag_is_system);
                 }
             }
@@ -42651,23 +52191,28 @@ var ts;
                         error(declaration, ts.Diagnostics.An_export_assignment_cannot_be_used_in_a_module_with_other_exported_elements);
                     }
                 }
-                var exports_1 = getExportsOfModule(moduleSymbol);
-                if (exports_1) {
-                    exports_1.forEach(function (_a, id) {
+                // Checks for export * conflicts
+                var exports = getExportsOfModule(moduleSymbol);
+                if (exports) {
+                    exports.forEach(function (_a, id) {
                         var declarations = _a.declarations, flags = _a.flags;
                         if (id === "__export") {
                             return;
                         }
-                        if (flags & (1920 | 64 | 384)) {
+                        // ECMA262: 15.2.1.1 It is a Syntax Error if the ExportedNames of ModuleItemList contains any duplicate entries.
+                        // (TS Exceptions: namespaces, function overloads, enums, and interfaces)
+                        if (flags & (1920 /* Namespace */ | 64 /* Interface */ | 384 /* Enum */)) {
                             return;
                         }
                         var exportedDeclarationsCount = ts.countWhere(declarations, isNotOverloadAndNotAccessor);
-                        if (flags & 524288 && exportedDeclarationsCount <= 2) {
+                        if (flags & 524288 /* TypeAlias */ && exportedDeclarationsCount <= 2) {
+                            // it is legal to merge type alias with other values
+                            // so count should be either 1 (just type alias) or 2 (type alias + merged value)
                             return;
                         }
                         if (exportedDeclarationsCount > 1) {
-                            for (var _i = 0, declarations_9 = declarations; _i < declarations_9.length; _i++) {
-                                var declaration = declarations_9[_i];
+                            for (var _i = 0, declarations_8 = declarations; _i < declarations_8.length; _i++) {
+                                var declaration = declarations_8[_i];
                                 if (isNotOverload(declaration)) {
                                     diagnostics.add(ts.createDiagnosticForNode(declaration, ts.Diagnostics.Cannot_redeclare_exported_variable_0, ts.unescapeLeadingUnderscores(id)));
                                 }
@@ -42679,10 +52224,11 @@ var ts;
             }
         }
         function isNotAccessor(declaration) {
+            // Accessors check for their own matching duplicates, and in contexts where they are valid, there are already duplicate identifier checks
             return !ts.isAccessor(declaration);
         }
         function isNotOverload(declaration) {
-            return (declaration.kind !== 234 && declaration.kind !== 154) ||
+            return (declaration.kind !== 234 /* FunctionDeclaration */ && declaration.kind !== 154 /* MethodDeclaration */) ||
                 !!declaration.body;
         }
         function checkSourceElement(node) {
@@ -42697,150 +52243,153 @@ var ts;
             }
             var kind = node.kind;
             if (cancellationToken) {
+                // Only bother checking on a few construct kinds.  We don't want to be excessively
+                // hitting the cancellation token on every node we check.
                 switch (kind) {
-                    case 239:
-                    case 235:
-                    case 236:
-                    case 234:
+                    case 239 /* ModuleDeclaration */:
+                    case 235 /* ClassDeclaration */:
+                    case 236 /* InterfaceDeclaration */:
+                    case 234 /* FunctionDeclaration */:
                         cancellationToken.throwIfCancellationRequested();
                 }
             }
             switch (kind) {
-                case 148:
+                case 148 /* TypeParameter */:
                     return checkTypeParameter(node);
-                case 149:
+                case 149 /* Parameter */:
                     return checkParameter(node);
-                case 152:
-                case 151:
+                case 152 /* PropertyDeclaration */:
+                case 151 /* PropertySignature */:
                     return checkPropertyDeclaration(node);
-                case 163:
-                case 164:
-                case 158:
-                case 159:
-                case 160:
+                case 163 /* FunctionType */:
+                case 164 /* ConstructorType */:
+                case 158 /* CallSignature */:
+                case 159 /* ConstructSignature */:
+                case 160 /* IndexSignature */:
                     return checkSignatureDeclaration(node);
-                case 154:
-                case 153:
+                case 154 /* MethodDeclaration */:
+                case 153 /* MethodSignature */:
                     return checkMethodDeclaration(node);
-                case 155:
+                case 155 /* Constructor */:
                     return checkConstructorDeclaration(node);
-                case 156:
-                case 157:
+                case 156 /* GetAccessor */:
+                case 157 /* SetAccessor */:
                     return checkAccessorDeclaration(node);
-                case 162:
+                case 162 /* TypeReference */:
                     return checkTypeReferenceNode(node);
-                case 161:
+                case 161 /* TypePredicate */:
                     return checkTypePredicate(node);
-                case 165:
+                case 165 /* TypeQuery */:
                     return checkTypeQuery(node);
-                case 166:
+                case 166 /* TypeLiteral */:
                     return checkTypeLiteral(node);
-                case 167:
+                case 167 /* ArrayType */:
                     return checkArrayType(node);
-                case 168:
+                case 168 /* TupleType */:
                     return checkTupleType(node);
-                case 169:
-                case 170:
+                case 169 /* UnionType */:
+                case 170 /* IntersectionType */:
                     return checkUnionOrIntersectionType(node);
-                case 173:
+                case 173 /* ParenthesizedType */:
                     return checkSourceElement(node.type);
-                case 175:
+                case 175 /* TypeOperator */:
                     return checkTypeOperator(node);
-                case 171:
+                case 171 /* ConditionalType */:
                     return checkConditionalType(node);
-                case 172:
+                case 172 /* InferType */:
                     return checkInferType(node);
-                case 179:
+                case 179 /* ImportType */:
                     return checkImportType(node);
-                case 290:
+                case 290 /* JSDocAugmentsTag */:
                     return checkJSDocAugmentsTag(node);
-                case 297:
-                case 292:
+                case 297 /* JSDocTypedefTag */:
+                case 292 /* JSDocCallbackTag */:
                     return checkJSDocTypeAliasTag(node);
-                case 293:
+                case 293 /* JSDocParameterTag */:
                     return checkJSDocParameterTag(node);
-                case 284:
+                case 284 /* JSDocFunctionType */:
                     checkSignatureDeclaration(node);
-                case 282:
-                case 281:
-                case 279:
-                case 280:
-                case 287:
+                // falls through
+                case 282 /* JSDocNonNullableType */:
+                case 281 /* JSDocNullableType */:
+                case 279 /* JSDocAllType */:
+                case 280 /* JSDocUnknownType */:
+                case 287 /* JSDocTypeLiteral */:
                     checkJSDocTypeIsInJsFile(node);
                     ts.forEachChild(node, checkSourceElement);
                     return;
-                case 285:
+                case 285 /* JSDocVariadicType */:
                     checkJSDocVariadicType(node);
                     return;
-                case 278:
+                case 278 /* JSDocTypeExpression */:
                     return checkSourceElement(node.type);
-                case 176:
+                case 176 /* IndexedAccessType */:
                     return checkIndexedAccessType(node);
-                case 177:
+                case 177 /* MappedType */:
                     return checkMappedType(node);
-                case 234:
+                case 234 /* FunctionDeclaration */:
                     return checkFunctionDeclaration(node);
-                case 213:
-                case 240:
+                case 213 /* Block */:
+                case 240 /* ModuleBlock */:
                     return checkBlock(node);
-                case 214:
+                case 214 /* VariableStatement */:
                     return checkVariableStatement(node);
-                case 216:
+                case 216 /* ExpressionStatement */:
                     return checkExpressionStatement(node);
-                case 217:
+                case 217 /* IfStatement */:
                     return checkIfStatement(node);
-                case 218:
+                case 218 /* DoStatement */:
                     return checkDoStatement(node);
-                case 219:
+                case 219 /* WhileStatement */:
                     return checkWhileStatement(node);
-                case 220:
+                case 220 /* ForStatement */:
                     return checkForStatement(node);
-                case 221:
+                case 221 /* ForInStatement */:
                     return checkForInStatement(node);
-                case 222:
+                case 222 /* ForOfStatement */:
                     return checkForOfStatement(node);
-                case 223:
-                case 224:
+                case 223 /* ContinueStatement */:
+                case 224 /* BreakStatement */:
                     return checkBreakOrContinueStatement(node);
-                case 225:
+                case 225 /* ReturnStatement */:
                     return checkReturnStatement(node);
-                case 226:
+                case 226 /* WithStatement */:
                     return checkWithStatement(node);
-                case 227:
+                case 227 /* SwitchStatement */:
                     return checkSwitchStatement(node);
-                case 228:
+                case 228 /* LabeledStatement */:
                     return checkLabeledStatement(node);
-                case 229:
+                case 229 /* ThrowStatement */:
                     return checkThrowStatement(node);
-                case 230:
+                case 230 /* TryStatement */:
                     return checkTryStatement(node);
-                case 232:
+                case 232 /* VariableDeclaration */:
                     return checkVariableDeclaration(node);
-                case 182:
+                case 182 /* BindingElement */:
                     return checkBindingElement(node);
-                case 235:
+                case 235 /* ClassDeclaration */:
                     return checkClassDeclaration(node);
-                case 236:
+                case 236 /* InterfaceDeclaration */:
                     return checkInterfaceDeclaration(node);
-                case 237:
+                case 237 /* TypeAliasDeclaration */:
                     return checkTypeAliasDeclaration(node);
-                case 238:
+                case 238 /* EnumDeclaration */:
                     return checkEnumDeclaration(node);
-                case 239:
+                case 239 /* ModuleDeclaration */:
                     return checkModuleDeclaration(node);
-                case 244:
+                case 244 /* ImportDeclaration */:
                     return checkImportDeclaration(node);
-                case 243:
+                case 243 /* ImportEqualsDeclaration */:
                     return checkImportEqualsDeclaration(node);
-                case 250:
+                case 250 /* ExportDeclaration */:
                     return checkExportDeclaration(node);
-                case 249:
+                case 249 /* ExportAssignment */:
                     return checkExportAssignment(node);
-                case 215:
-                case 231:
+                case 215 /* EmptyStatement */:
+                case 231 /* DebuggerStatement */:
                     checkGrammarStatementInAmbientContext(node);
                     return;
-                case 253:
+                case 253 /* MissingDeclaration */:
                     return checkMissingDeclaration(node);
             }
         }
@@ -42852,6 +52401,7 @@ var ts;
         function checkJSDocVariadicType(node) {
             checkJSDocTypeIsInJsFile(node);
             checkSourceElement(node.type);
+            // Only legal location is in the *last* parameter tag or last parameter of a JSDoc function.
             var parent = node.parent;
             if (ts.isParameter(parent) && ts.isJSDocFunctionType(parent.parent)) {
                 if (ts.last(parent.parent.parameters) !== parent) {
@@ -42869,6 +52419,7 @@ var ts;
             }
             var param = ts.getParameterSymbolFromJSDoc(paramTag);
             if (!param) {
+                // We will error in `checkJSDocParameterTag`.
                 return;
             }
             var host = ts.getHostSignatureFromJSDoc(paramTag);
@@ -42881,8 +52432,16 @@ var ts;
             var parent = node.parent;
             var paramTag = node.parent.parent;
             if (ts.isJSDocTypeExpression(node.parent) && ts.isJSDocParameterTag(paramTag)) {
+                // Else we will add a diagnostic, see `checkJSDocVariadicType`.
                 var host_1 = ts.getHostSignatureFromJSDoc(paramTag);
                 if (host_1) {
+                    /*
+                    Only return an array type if the corresponding parameter is marked as a rest parameter, or if there are no parameters.
+                    So in the following situation we will not create an array type:
+                        /** @param {...number} a * /
+                        function f(a) {}
+                    Because `a` will just be of type `number | undefined`. A synthetic `...args` will also be added, which *will* get an array type.
+                    */
                     var lastParamDeclaration = ts.lastOrUndefined(host_1.parameters);
                     var symbol = ts.getParameterSymbolFromJSDoc(paramTag);
                     if (!lastParamDeclaration ||
@@ -42896,6 +52455,15 @@ var ts;
             }
             return addOptionality(type);
         }
+        // Function and class expression bodies are checked after all statements in the enclosing body. This is
+        // to ensure constructs like the following are permitted:
+        //     const foo = function () {
+        //        const s = foo();
+        //        return "hello";
+        //     }
+        // Here, performing a full type check of the body of the function expression whilst in the process of
+        // determining the type of foo would cause foo to be given type any because of the recursive reference.
+        // Delaying the type check of the body ensures foo has been assigned a type.
         function checkNodeDeferred(node) {
             if (deferredNodes) {
                 deferredNodes.push(node);
@@ -42905,17 +52473,17 @@ var ts;
             for (var _i = 0, _a = deferredNodes; _i < _a.length; _i++) {
                 var node = _a[_i];
                 switch (node.kind) {
-                    case 192:
-                    case 193:
-                    case 154:
-                    case 153:
+                    case 192 /* FunctionExpression */:
+                    case 193 /* ArrowFunction */:
+                    case 154 /* MethodDeclaration */:
+                    case 153 /* MethodSignature */:
                         checkFunctionExpressionOrObjectLiteralMethodDeferred(node);
                         break;
-                    case 156:
-                    case 157:
+                    case 156 /* GetAccessor */:
+                    case 157 /* SetAccessor */:
                         checkAccessorDeclaration(node);
                         break;
-                    case 205:
+                    case 205 /* ClassExpression */:
                         checkClassExpressionDeferred(node);
                         break;
                 }
@@ -42929,9 +52497,9 @@ var ts;
         }
         function unusedIsError(kind) {
             switch (kind) {
-                case 0:
+                case 0 /* Local */:
                     return !!compilerOptions.noUnusedLocals;
-                case 1:
+                case 1 /* Parameter */:
                     return !!compilerOptions.noUnusedParameters;
                 default:
                     return ts.Debug.assertNever(kind);
@@ -42940,12 +52508,17 @@ var ts;
         function getPotentiallyUnusedIdentifiers(sourceFile) {
             return allPotentiallyUnusedIdentifiers.get(sourceFile.path) || ts.emptyArray;
         }
+        // Fully type check a source file and collect the relevant diagnostics.
         function checkSourceFileWorker(node) {
             var links = getNodeLinks(node);
-            if (!(links.flags & 1)) {
+            if (!(links.flags & 1 /* TypeChecked */)) {
+                // If skipLibCheck is enabled, skip type checking if file is a declaration file.
+                // If skipDefaultLibCheck is enabled, skip type checking if file contains a
+                // '/// <reference no-default-lib="true"/>' directive.
                 if (compilerOptions.skipLibCheck && node.isDeclarationFile || compilerOptions.skipDefaultLibCheck && node.hasNoDefaultLib) {
                     return;
                 }
+                // Grammar checking
                 checkGrammarSourceFile(node);
                 ts.clear(potentialThisCollisions);
                 ts.clear(potentialNewTargetCollisions);
@@ -42974,11 +52547,14 @@ var ts;
                     ts.forEach(potentialNewTargetCollisions, checkIfNewTargetIsCapturedInEnclosingScope);
                     ts.clear(potentialNewTargetCollisions);
                 }
-                links.flags |= 1;
+                links.flags |= 1 /* TypeChecked */;
             }
         }
         function getDiagnostics(sourceFile, ct) {
             try {
+                // Record the cancellation token so it can be checked later on during checkSourceElement.
+                // Do this in a finally block so we can ensure that it gets reset back to nothing after
+                // this call is done.
                 cancellationToken = ct;
                 return getDiagnosticsWorker(sourceFile);
             }
@@ -42989,20 +52565,29 @@ var ts;
         function getDiagnosticsWorker(sourceFile) {
             throwIfNonDiagnosticsProducing();
             if (sourceFile) {
+                // Some global diagnostics are deferred until they are needed and
+                // may not be reported in the firt call to getGlobalDiagnostics.
+                // We should catch these changes and report them.
                 var previousGlobalDiagnostics = diagnostics.getGlobalDiagnostics();
                 var previousGlobalDiagnosticsSize = previousGlobalDiagnostics.length;
                 checkSourceFile(sourceFile);
                 var semanticDiagnostics = diagnostics.getDiagnostics(sourceFile.fileName);
                 var currentGlobalDiagnostics = diagnostics.getGlobalDiagnostics();
                 if (currentGlobalDiagnostics !== previousGlobalDiagnostics) {
+                    // If the arrays are not the same reference, new diagnostics were added.
                     var deferredGlobalDiagnostics = ts.relativeComplement(previousGlobalDiagnostics, currentGlobalDiagnostics, ts.compareDiagnostics);
                     return ts.concatenate(deferredGlobalDiagnostics, semanticDiagnostics);
                 }
                 else if (previousGlobalDiagnosticsSize === 0 && currentGlobalDiagnostics.length > 0) {
+                    // If the arrays are the same reference, but the length has changed, a single
+                    // new diagnostic was added as DiagnosticCollection attempts to reuse the
+                    // same array.
                     return ts.concatenate(currentGlobalDiagnostics, semanticDiagnostics);
                 }
                 return semanticDiagnostics;
             }
+            // Global diagnostics are always added when a file is not provided to
+            // getDiagnostics
             ts.forEach(host.getSourceFiles(), checkSourceFile);
             return diagnostics.getDiagnostics();
         }
@@ -43015,8 +52600,10 @@ var ts;
                 throw new Error("Trying to get diagnostics from a type checker that does not produce them.");
             }
         }
+        // Language service support
         function getSymbolsInScope(location, meaning) {
-            if (location.flags & 8388608) {
+            if (location.flags & 8388608 /* InWithStatement */) {
+                // We cannot answer semantic questions within a with block, do not proceed any further
                 return [];
             }
             var symbols = ts.createSymbolTable();
@@ -43029,24 +52616,31 @@ var ts;
                         copySymbols(location.locals, meaning);
                     }
                     switch (location.kind) {
-                        case 239:
-                            copySymbols(getSymbolOfNode(location).exports, meaning & 2623475);
+                        case 239 /* ModuleDeclaration */:
+                            copySymbols(getSymbolOfNode(location).exports, meaning & 2623475 /* ModuleMember */);
                             break;
-                        case 238:
-                            copySymbols(getSymbolOfNode(location).exports, meaning & 8);
+                        case 238 /* EnumDeclaration */:
+                            copySymbols(getSymbolOfNode(location).exports, meaning & 8 /* EnumMember */);
                             break;
-                        case 205:
+                        case 205 /* ClassExpression */:
                             var className = location.name;
                             if (className) {
                                 copySymbol(location.symbol, meaning);
                             }
-                        case 235:
-                        case 236:
+                        // falls through
+                        // this fall-through is necessary because we would like to handle
+                        // type parameter inside class expression similar to how we handle it in classDeclaration and interface Declaration
+                        case 235 /* ClassDeclaration */:
+                        case 236 /* InterfaceDeclaration */:
+                            // If we didn't come from static member of class or interface,
+                            // add the type parameters into the symbol table
+                            // (type parameters of classDeclaration/classExpression and interface are in member property of the symbol.
+                            // Note: that the memberFlags come from previous iteration.
                             if (!isStatic) {
-                                copySymbols(getMembersOfSymbol(getSymbolOfNode(location)), meaning & 67901928);
+                                copySymbols(getMembersOfSymbol(getSymbolOfNode(location)), meaning & 67901928 /* Type */);
                             }
                             break;
-                        case 192:
+                        case 192 /* FunctionExpression */:
                             var funcName = location.name;
                             if (funcName) {
                                 copySymbol(location.symbol, meaning);
@@ -43056,14 +52650,24 @@ var ts;
                     if (ts.introducesArgumentsExoticObject(location)) {
                         copySymbol(argumentsSymbol, meaning);
                     }
-                    isStatic = ts.hasModifier(location, 32);
+                    isStatic = ts.hasModifier(location, 32 /* Static */);
                     location = location.parent;
                 }
                 copySymbols(globals, meaning);
             }
+            /**
+             * Copy the given symbol into symbol tables if the symbol has the given meaning
+             * and it doesn't already existed in the symbol table
+             * @param key a key for storing in symbol table; if undefined, use symbol.name
+             * @param symbol the symbol to be added into symbol table
+             * @param meaning meaning of symbol to filter by before adding to symbol table
+             */
             function copySymbol(symbol, meaning) {
                 if (ts.getCombinedLocalAndExportSymbolFlags(symbol) & meaning) {
                     var id = symbol.escapedName;
+                    // We will copy all symbol regardless of its reserved name because
+                    // symbolsToArray will check whether the key is a reserved name and
+                    // it will not copy symbol with reserved name to the array
                     if (!symbols.has(id)) {
                         symbols.set(id, symbol);
                     }
@@ -43078,33 +52682,34 @@ var ts;
             }
         }
         function isTypeDeclarationName(name) {
-            return name.kind === 71 &&
+            return name.kind === 71 /* Identifier */ &&
                 isTypeDeclaration(name.parent) &&
                 name.parent.name === name;
         }
         function isTypeDeclaration(node) {
             switch (node.kind) {
-                case 148:
-                case 235:
-                case 236:
-                case 237:
-                case 238:
+                case 148 /* TypeParameter */:
+                case 235 /* ClassDeclaration */:
+                case 236 /* InterfaceDeclaration */:
+                case 237 /* TypeAliasDeclaration */:
+                case 238 /* EnumDeclaration */:
                     return true;
                 default:
                     return false;
             }
         }
+        // True if the given identifier is part of a type reference
         function isTypeReferenceIdentifier(node) {
-            while (node.parent.kind === 146) {
+            while (node.parent.kind === 146 /* QualifiedName */) {
                 node = node.parent;
             }
-            return node.parent.kind === 162;
+            return node.parent.kind === 162 /* TypeReference */;
         }
         function isHeritageClauseElementIdentifier(node) {
-            while (node.parent.kind === 185) {
+            while (node.parent.kind === 185 /* PropertyAccessExpression */) {
                 node = node.parent;
             }
-            return node.parent.kind === 207;
+            return node.parent.kind === 207 /* ExpressionWithTypeArguments */;
         }
         function forEachEnclosingClass(node, callback) {
             var result;
@@ -43132,13 +52737,13 @@ var ts;
             return !!forEachEnclosingClass(node, function (n) { return n === classDeclaration; });
         }
         function getLeftSideOfImportEqualsOrExportAssignment(nodeOnRightSide) {
-            while (nodeOnRightSide.parent.kind === 146) {
+            while (nodeOnRightSide.parent.kind === 146 /* QualifiedName */) {
                 nodeOnRightSide = nodeOnRightSide.parent;
             }
-            if (nodeOnRightSide.parent.kind === 243) {
+            if (nodeOnRightSide.parent.kind === 243 /* ImportEqualsDeclaration */) {
                 return nodeOnRightSide.parent.moduleReference === nodeOnRightSide ? nodeOnRightSide.parent : undefined;
             }
-            if (nodeOnRightSide.parent.kind === 249) {
+            if (nodeOnRightSide.parent.kind === 249 /* ExportAssignment */) {
                 return nodeOnRightSide.parent.expression === nodeOnRightSide ? nodeOnRightSide.parent : undefined;
             }
             return undefined;
@@ -43149,12 +52754,12 @@ var ts;
         function getSpecialPropertyAssignmentSymbolFromEntityName(entityName) {
             var specialPropertyAssignmentKind = ts.getSpecialPropertyAssignmentKind(entityName.parent.parent);
             switch (specialPropertyAssignmentKind) {
-                case 1:
-                case 3:
+                case 1 /* ExportsProperty */:
+                case 3 /* PrototypeProperty */:
                     return getSymbolOfNode(entityName.parent);
-                case 4:
-                case 2:
-                case 5:
+                case 4 /* ThisProperty */:
+                case 2 /* ModuleExports */:
+                case 5 /* Property */:
                     return getSymbolOfNode(entityName.parent.parent);
             }
         }
@@ -43164,7 +52769,7 @@ var ts;
                 node = parent;
                 parent = parent.parent;
             }
-            if (parent && parent.kind === 179 && parent.qualifier === node) {
+            if (parent && parent.kind === 179 /* ImportType */ && parent.qualifier === node) {
                 return parent;
             }
             return undefined;
@@ -43174,23 +52779,27 @@ var ts;
                 return getSymbolOfNode(entityName.parent);
             }
             if (ts.isInJavaScriptFile(entityName) &&
-                entityName.parent.kind === 185 &&
+                entityName.parent.kind === 185 /* PropertyAccessExpression */ &&
                 entityName.parent === entityName.parent.parent.left) {
+                // Check if this is a special property assignment
                 var specialPropertyAssignmentSymbol = getSpecialPropertyAssignmentSymbolFromEntityName(entityName);
                 if (specialPropertyAssignmentSymbol) {
                     return specialPropertyAssignmentSymbol;
                 }
             }
-            if (entityName.parent.kind === 249 && ts.isEntityNameExpression(entityName)) {
-                var success = resolveEntityName(entityName, 67216319 | 67901928 | 1920 | 2097152, true);
+            if (entityName.parent.kind === 249 /* ExportAssignment */ && ts.isEntityNameExpression(entityName)) {
+                // Even an entity name expression that doesn't resolve as an entityname may still typecheck as a property access expression
+                var success = resolveEntityName(entityName, 
+                /*all meanings*/ 67216319 /* Value */ | 67901928 /* Type */ | 1920 /* Namespace */ | 2097152 /* Alias */, /*ignoreErrors*/ true);
                 if (success && success !== unknownSymbol) {
                     return success;
                 }
             }
             else if (!ts.isPropertyAccessExpression(entityName) && isInRightSideOfImportOrExportAssignment(entityName)) {
-                var importEqualsDeclaration = ts.getAncestor(entityName, 243);
+                // Since we already checked for ExportAssignment, this really could only be an Import
+                var importEqualsDeclaration = ts.getAncestor(entityName, 243 /* ImportEqualsDeclaration */);
                 ts.Debug.assert(importEqualsDeclaration !== undefined);
-                return getSymbolOfPartOfRightHandSideOfImportEquals(entityName, true);
+                return getSymbolOfPartOfRightHandSideOfImportEquals(entityName, /*dontResolveAlias*/ true);
             }
             if (!ts.isPropertyAccessExpression(entityName)) {
                 var possibleImportNode = isImportTypeQualifierPart(entityName);
@@ -43204,47 +52813,50 @@ var ts;
                 entityName = entityName.parent;
             }
             if (isHeritageClauseElementIdentifier(entityName)) {
-                var meaning = 0;
-                if (entityName.parent.kind === 207) {
-                    meaning = 67901928;
+                var meaning = 0 /* None */;
+                // In an interface or class, we're definitely interested in a type.
+                if (entityName.parent.kind === 207 /* ExpressionWithTypeArguments */) {
+                    meaning = 67901928 /* Type */;
+                    // In a class 'extends' clause we are also looking for a value.
                     if (ts.isExpressionWithTypeArgumentsInClassExtendsClause(entityName.parent)) {
-                        meaning |= 67216319;
+                        meaning |= 67216319 /* Value */;
                     }
                 }
                 else {
-                    meaning = 1920;
+                    meaning = 1920 /* Namespace */;
                 }
-                meaning |= 2097152;
+                meaning |= 2097152 /* Alias */;
                 var entityNameSymbol = ts.isEntityNameExpression(entityName) ? resolveEntityName(entityName, meaning) : undefined;
                 if (entityNameSymbol) {
                     return entityNameSymbol;
                 }
             }
-            if (entityName.parent.kind === 293) {
+            if (entityName.parent.kind === 293 /* JSDocParameterTag */) {
                 return ts.getParameterSymbolFromJSDoc(entityName.parent);
             }
-            if (entityName.parent.kind === 148 && entityName.parent.parent.kind === 296) {
-                ts.Debug.assert(!ts.isInJavaScriptFile(entityName));
+            if (entityName.parent.kind === 148 /* TypeParameter */ && entityName.parent.parent.kind === 296 /* JSDocTemplateTag */) {
+                ts.Debug.assert(!ts.isInJavaScriptFile(entityName)); // Otherwise `isDeclarationName` would have been true.
                 var typeParameter = ts.getTypeParameterFromJsDoc(entityName.parent);
                 return typeParameter && typeParameter.symbol;
             }
             if (ts.isExpressionNode(entityName)) {
                 if (ts.nodeIsMissing(entityName)) {
+                    // Missing entity name.
                     return undefined;
                 }
-                if (entityName.kind === 71) {
+                if (entityName.kind === 71 /* Identifier */) {
                     if (ts.isJSXTagName(entityName) && isJsxIntrinsicIdentifier(entityName)) {
                         var symbol = getIntrinsicTagSymbol(entityName.parent);
                         return symbol === unknownSymbol ? undefined : symbol;
                     }
-                    return resolveEntityName(entityName, 67216319, false, true);
+                    return resolveEntityName(entityName, 67216319 /* Value */, /*ignoreErrors*/ false, /*dontResolveAlias*/ true);
                 }
-                else if (entityName.kind === 185 || entityName.kind === 146) {
+                else if (entityName.kind === 185 /* PropertyAccessExpression */ || entityName.kind === 146 /* QualifiedName */) {
                     var links = getNodeLinks(entityName);
                     if (links.resolvedSymbol) {
                         return links.resolvedSymbol;
                     }
-                    if (entityName.kind === 185) {
+                    if (entityName.kind === 185 /* PropertyAccessExpression */) {
                         checkPropertyAccessExpression(entityName);
                     }
                     else {
@@ -43254,38 +52866,41 @@ var ts;
                 }
             }
             else if (isTypeReferenceIdentifier(entityName)) {
-                var meaning = entityName.parent.kind === 162 ? 67901928 : 1920;
-                return resolveEntityName(entityName, meaning, false, true);
+                var meaning = entityName.parent.kind === 162 /* TypeReference */ ? 67901928 /* Type */ : 1920 /* Namespace */;
+                return resolveEntityName(entityName, meaning, /*ignoreErrors*/ false, /*dontResolveAlias*/ true);
             }
-            else if (entityName.parent.kind === 262) {
+            else if (entityName.parent.kind === 262 /* JsxAttribute */) {
                 return getJsxAttributePropertySymbol(entityName.parent);
             }
-            if (entityName.parent.kind === 161) {
-                return resolveEntityName(entityName, 1);
+            if (entityName.parent.kind === 161 /* TypePredicate */) {
+                return resolveEntityName(entityName, /*meaning*/ 1 /* FunctionScopedVariable */);
             }
+            // Do we want to return undefined here?
             return undefined;
         }
         function getSymbolAtLocation(node) {
-            if (node.kind === 274) {
+            if (node.kind === 274 /* SourceFile */) {
                 return ts.isExternalModule(node) ? getMergedSymbol(node.symbol) : undefined;
             }
             var parent = node.parent;
             var grandParent = parent.parent;
-            if (node.flags & 8388608) {
+            if (node.flags & 8388608 /* InWithStatement */) {
+                // We cannot answer semantic questions within a with block, do not proceed any further
                 return undefined;
             }
             if (isDeclarationNameOrImportPropertyName(node)) {
+                // This is a declaration, call getSymbolOfNode
                 return getSymbolOfNode(parent);
             }
             else if (ts.isLiteralComputedPropertyDeclarationName(node)) {
                 return getSymbolOfNode(parent.parent);
             }
-            if (node.kind === 71) {
+            if (node.kind === 71 /* Identifier */) {
                 if (isInRightSideOfImportOrExportAssignment(node)) {
                     return getSymbolOfEntityNameOrPropertyAccessExpression(node);
                 }
-                else if (parent.kind === 182 &&
-                    grandParent.kind === 180 &&
+                else if (parent.kind === 182 /* BindingElement */ &&
+                    grandParent.kind === 180 /* ObjectBindingPattern */ &&
                     node === parent.propertyName) {
                     var typeOfPattern = getTypeOfNode(grandParent);
                     var propertyDeclaration = typeOfPattern && getPropertyOfType(typeOfPattern, node.escapedText);
@@ -43295,12 +52910,12 @@ var ts;
                 }
             }
             switch (node.kind) {
-                case 71:
-                case 185:
-                case 146:
+                case 71 /* Identifier */:
+                case 185 /* PropertyAccessExpression */:
+                case 146 /* QualifiedName */:
                     return getSymbolOfEntityNameOrPropertyAccessExpression(node);
-                case 99:
-                    var container = ts.getThisContainer(node, false);
+                case 99 /* ThisKeyword */:
+                    var container = ts.getThisContainer(node, /*includeArrowFunctions*/ false);
                     if (ts.isFunctionLike(container)) {
                         var sig = getSignatureFromDeclaration(container);
                         if (sig.thisParameter) {
@@ -43310,54 +52925,64 @@ var ts;
                     if (ts.isInExpressionContext(node)) {
                         return checkExpression(node).symbol;
                     }
-                case 174:
+                // falls through
+                case 174 /* ThisType */:
                     return getTypeFromThisTypeNode(node).symbol;
-                case 97:
+                case 97 /* SuperKeyword */:
                     return checkExpression(node).symbol;
-                case 123:
+                case 123 /* ConstructorKeyword */:
+                    // constructor keyword for an overload, should take us to the definition if it exist
                     var constructorDeclaration = node.parent;
-                    if (constructorDeclaration && constructorDeclaration.kind === 155) {
+                    if (constructorDeclaration && constructorDeclaration.kind === 155 /* Constructor */) {
                         return constructorDeclaration.parent.symbol;
                     }
                     return undefined;
-                case 9:
-                case 13:
+                case 9 /* StringLiteral */:
+                case 13 /* NoSubstitutionTemplateLiteral */:
+                    // 1). import x = require("./mo/*gotToDefinitionHere*/d")
+                    // 2). External module name in an import declaration
+                    // 3). Dynamic import call or require in javascript
+                    // 4). type A = import("./f/*gotToDefinitionHere*/oo")
                     if ((ts.isExternalModuleImportEqualsDeclaration(node.parent.parent) && ts.getExternalModuleImportEqualsDeclarationExpression(node.parent.parent) === node) ||
-                        ((node.parent.kind === 244 || node.parent.kind === 250) && node.parent.moduleSpecifier === node) ||
-                        ((ts.isInJavaScriptFile(node) && ts.isRequireCall(node.parent, false)) || ts.isImportCall(node.parent)) ||
+                        ((node.parent.kind === 244 /* ImportDeclaration */ || node.parent.kind === 250 /* ExportDeclaration */) && node.parent.moduleSpecifier === node) ||
+                        ((ts.isInJavaScriptFile(node) && ts.isRequireCall(node.parent, /*checkArgumentIsStringLiteralLike*/ false)) || ts.isImportCall(node.parent)) ||
                         (ts.isLiteralTypeNode(node.parent) && ts.isLiteralImportTypeNode(node.parent.parent) && node.parent.parent.argument === node.parent)) {
                         return resolveExternalModuleName(node, node);
                     }
-                case 8:
+                // falls through
+                case 8 /* NumericLiteral */:
+                    // index access
                     var objectType = ts.isElementAccessExpression(parent)
                         ? parent.argumentExpression === node ? getTypeOfExpression(parent.expression) : undefined
                         : ts.isLiteralTypeNode(parent) && ts.isIndexedAccessTypeNode(grandParent)
                             ? getTypeFromTypeNode(grandParent.objectType)
                             : undefined;
                     return objectType && getPropertyOfType(objectType, ts.escapeLeadingUnderscores(node.text));
-                case 79:
-                case 89:
-                case 36:
+                case 79 /* DefaultKeyword */:
+                case 89 /* FunctionKeyword */:
+                case 36 /* EqualsGreaterThanToken */:
                     return getSymbolOfNode(node.parent);
-                case 179:
+                case 179 /* ImportType */:
                     return ts.isLiteralImportTypeNode(node) ? getSymbolAtLocation(node.argument.literal) : undefined;
                 default:
                     return undefined;
             }
         }
         function getShorthandAssignmentValueSymbol(location) {
-            if (location && location.kind === 271) {
-                return resolveEntityName(location.name, 67216319 | 2097152);
+            if (location && location.kind === 271 /* ShorthandPropertyAssignment */) {
+                return resolveEntityName(location.name, 67216319 /* Value */ | 2097152 /* Alias */);
             }
             return undefined;
         }
+        /** Returns the target of an export specifier without following aliases */
         function getExportSpecifierLocalTargetSymbol(node) {
             return node.parent.parent.moduleSpecifier ?
                 getExternalModuleMember(node.parent.parent, node) :
-                resolveEntityName(node.propertyName || node.name, 67216319 | 67901928 | 1920 | 2097152);
+                resolveEntityName(node.propertyName || node.name, 67216319 /* Value */ | 67901928 /* Type */ | 1920 /* Namespace */ | 2097152 /* Alias */);
         }
         function getTypeOfNode(node) {
-            if (node.flags & 8388608) {
+            if (node.flags & 8388608 /* InWithStatement */) {
+                // We cannot answer semantic questions within a with block, do not proceed any further
                 return errorType;
             }
             if (ts.isPartOfTypeNode(node)) {
@@ -43373,12 +52998,15 @@ var ts;
                 return getRegularTypeOfExpression(node);
             }
             if (ts.isExpressionWithTypeArgumentsInClassExtendsClause(node)) {
+                // A SyntaxKind.ExpressionWithTypeArguments is considered a type node, except when it occurs in the
+                // extends clause of a class. We handle that case here.
                 var classNode = ts.getContainingClass(node);
                 var classType = getDeclaredTypeOfSymbol(getSymbolOfNode(classNode));
                 var baseType = getBaseTypes(classType)[0];
                 return baseType && getTypeWithThisArgument(baseType, classType.thisType);
             }
             if (isTypeDeclaration(node)) {
+                // In this case, we call getSymbolOfNode instead of getSymbolAtLocation because it is a declaration
                 var symbol = getSymbolOfNode(node);
                 return getDeclaredTypeOfSymbol(symbol);
             }
@@ -43387,6 +53015,7 @@ var ts;
                 return symbol && getDeclaredTypeOfSymbol(symbol);
             }
             if (ts.isDeclaration(node)) {
+                // In this case, we call getSymbolOfNode instead of getSymbolAtLocation because it is a declaration
                 var symbol = getSymbolOfNode(node);
                 return getTypeOfSymbol(symbol);
             }
@@ -43395,7 +53024,7 @@ var ts;
                 return symbol && getTypeOfSymbol(symbol);
             }
             if (ts.isBindingPattern(node)) {
-                return getTypeForVariableLikeDeclaration(node.parent, true);
+                return getTypeForVariableLikeDeclaration(node.parent, /*includeOptionality*/ true);
             }
             if (isInRightSideOfImportOrExportAssignment(node)) {
                 var symbol = getSymbolAtLocation(node);
@@ -43406,26 +53035,48 @@ var ts;
             }
             return errorType;
         }
+        // Gets the type of object literal or array literal of destructuring assignment.
+        // { a } from
+        //     for ( { a } of elems) {
+        //     }
+        // [ a ] from
+        //     [a] = [ some array ...]
         function getTypeOfArrayLiteralOrObjectLiteralDestructuringAssignment(expr) {
-            ts.Debug.assert(expr.kind === 184 || expr.kind === 183);
-            if (expr.parent.kind === 222) {
+            ts.Debug.assert(expr.kind === 184 /* ObjectLiteralExpression */ || expr.kind === 183 /* ArrayLiteralExpression */);
+            // If this is from "for of"
+            //     for ( { a } of elems) {
+            //     }
+            if (expr.parent.kind === 222 /* ForOfStatement */) {
                 var iteratedType = checkRightHandSideOfForOf(expr.parent.expression, expr.parent.awaitModifier);
                 return checkDestructuringAssignment(expr, iteratedType || errorType);
             }
-            if (expr.parent.kind === 200) {
+            // If this is from "for" initializer
+            //     for ({a } = elems[0];.....) { }
+            if (expr.parent.kind === 200 /* BinaryExpression */) {
                 var iteratedType = getTypeOfExpression(expr.parent.right);
                 return checkDestructuringAssignment(expr, iteratedType || errorType);
             }
-            if (expr.parent.kind === 270) {
+            // If this is from nested object binding pattern
+            //     for ({ skills: { primary, secondary } } = multiRobot, i = 0; i < 1; i++) {
+            if (expr.parent.kind === 270 /* PropertyAssignment */) {
                 var typeOfParentObjectLiteral = getTypeOfArrayLiteralOrObjectLiteralDestructuringAssignment(expr.parent.parent);
-                return checkObjectLiteralDestructuringPropertyAssignment(typeOfParentObjectLiteral || errorType, expr.parent);
+                return checkObjectLiteralDestructuringPropertyAssignment(typeOfParentObjectLiteral || errorType, expr.parent); // TODO: GH#18217
             }
-            ts.Debug.assert(expr.parent.kind === 183);
+            // Array literal assignment - array destructuring pattern
+            ts.Debug.assert(expr.parent.kind === 183 /* ArrayLiteralExpression */);
+            //    [{ property1: p1, property2 }] = elems;
             var typeOfArrayLiteral = getTypeOfArrayLiteralOrObjectLiteralDestructuringAssignment(expr.parent);
-            var elementType = checkIteratedTypeOrElementType(typeOfArrayLiteral || errorType, expr.parent, false, false) || errorType;
-            return checkArrayLiteralDestructuringElementAssignment(expr.parent, typeOfArrayLiteral, expr.parent.elements.indexOf(expr), elementType || errorType);
+            var elementType = checkIteratedTypeOrElementType(typeOfArrayLiteral || errorType, expr.parent, /*allowStringInput*/ false, /*allowAsyncIterables*/ false) || errorType;
+            return checkArrayLiteralDestructuringElementAssignment(expr.parent, typeOfArrayLiteral, expr.parent.elements.indexOf(expr), elementType || errorType); // TODO: GH#18217
         }
+        // Gets the property symbol corresponding to the property in destructuring assignment
+        // 'property1' from
+        //     for ( { property1: a } of elems) {
+        //     }
+        // 'property1' at location 'a' from:
+        //     [a] = [ property1, property2 ]
         function getPropertySymbolOfDestructuringAssignment(location) {
+            // Get the type of the object or array literal and then look for property of given name in the type
             var typeOfObjectLiteral = getTypeOfArrayLiteralOrObjectLiteralDestructuringAssignment(location.parent.parent);
             return typeOfObjectLiteral && getPropertyOfType(typeOfObjectLiteral, location.escapedText);
         }
@@ -43435,12 +53086,18 @@ var ts;
             }
             return getRegularTypeOfLiteralType(getTypeOfExpression(expr));
         }
+        /**
+         * Gets either the static or instance type of a class element, based on
+         * whether the element is declared as "static".
+         */
         function getParentTypeOfClassElement(node) {
             var classSymbol = getSymbolOfNode(node.parent);
-            return ts.hasModifier(node, 32)
+            return ts.hasModifier(node, 32 /* Static */)
                 ? getTypeOfSymbol(classSymbol)
                 : getDeclaredTypeOfSymbol(classSymbol);
         }
+        // Return the list of properties of the given type, augmented with properties from Function
+        // if the type has call or construct signatures
         function getAugmentedPropertiesOfType(type) {
             type = getApparentType(type);
             var propsByName = ts.createSymbolTable(getPropertiesOfType(type));
@@ -43461,10 +53118,10 @@ var ts;
             return roots ? ts.flatMap(roots, getRootSymbols) : [symbol];
         }
         function getImmediateRootSymbols(symbol) {
-            if (ts.getCheckFlags(symbol) & 6) {
+            if (ts.getCheckFlags(symbol) & 6 /* Synthetic */) {
                 return ts.mapDefined(getSymbolLinks(symbol).containingType.types, function (type) { return getPropertyOfType(type, symbol.escapedName); });
             }
-            else if (symbol.flags & 33554432) {
+            else if (symbol.flags & 33554432 /* Transient */) {
                 var _a = symbol, leftSpread = _a.leftSpread, rightSpread = _a.rightSpread, syntheticOrigin = _a.syntheticOrigin;
                 return leftSpread ? [leftSpread, rightSpread]
                     : syntheticOrigin ? [syntheticOrigin]
@@ -43480,11 +53137,12 @@ var ts;
             }
             return target;
         }
+        // Emitter support
         function isArgumentsLocalBinding(nodeIn) {
             if (!ts.isGeneratedIdentifier(nodeIn)) {
                 var node = ts.getParseTreeNode(nodeIn, ts.isIdentifier);
                 if (node) {
-                    var isPropertyName_1 = node.parent.kind === 185 && node.parent.name === node;
+                    var isPropertyName_1 = node.parent.kind === 185 /* PropertyAccessExpression */ && node.parent.name === node;
                     return !isPropertyName_1 && getReferencedValueSymbol(node) === argumentsSymbol;
                 }
             }
@@ -43493,42 +53151,57 @@ var ts;
         function moduleExportsSomeValue(moduleReferenceExpression) {
             var moduleSymbol = resolveExternalModuleName(moduleReferenceExpression.parent, moduleReferenceExpression);
             if (!moduleSymbol || ts.isShorthandAmbientModuleSymbol(moduleSymbol)) {
+                // If the module is not found or is shorthand, assume that it may export a value.
                 return true;
             }
             var hasExportAssignment = hasExportAssignmentSymbol(moduleSymbol);
+            // if module has export assignment then 'resolveExternalModuleSymbol' will return resolved symbol for export assignment
+            // otherwise it will return moduleSymbol itself
             moduleSymbol = resolveExternalModuleSymbol(moduleSymbol);
             var symbolLinks = getSymbolLinks(moduleSymbol);
             if (symbolLinks.exportsSomeValue === undefined) {
+                // for export assignments - check if resolved symbol for RHS is itself a value
+                // otherwise - check if at least one export is value
                 symbolLinks.exportsSomeValue = hasExportAssignment
-                    ? !!(moduleSymbol.flags & 67216319)
+                    ? !!(moduleSymbol.flags & 67216319 /* Value */)
                     : ts.forEachEntry(getExportsOfModule(moduleSymbol), isValue);
             }
             return symbolLinks.exportsSomeValue;
             function isValue(s) {
                 s = resolveSymbol(s);
-                return s && !!(s.flags & 67216319);
+                return s && !!(s.flags & 67216319 /* Value */);
             }
         }
         function isNameOfModuleOrEnumDeclaration(node) {
             return ts.isModuleOrEnumDeclaration(node.parent) && node === node.parent.name;
         }
+        // When resolved as an expression identifier, if the given node references an exported entity, return the declaration
+        // node of the exported entity's container. Otherwise, return undefined.
         function getReferencedExportContainer(nodeIn, prefixLocals) {
             var node = ts.getParseTreeNode(nodeIn, ts.isIdentifier);
             if (node) {
-                var symbol = getReferencedValueSymbol(node, isNameOfModuleOrEnumDeclaration(node));
+                // When resolving the export container for the name of a module or enum
+                // declaration, we need to start resolution at the declaration's container.
+                // Otherwise, we could incorrectly resolve the export container as the
+                // declaration if it contains an exported member with the same name.
+                var symbol = getReferencedValueSymbol(node, /*startInDeclarationContainer*/ isNameOfModuleOrEnumDeclaration(node));
                 if (symbol) {
-                    if (symbol.flags & 1048576) {
+                    if (symbol.flags & 1048576 /* ExportValue */) {
+                        // If we reference an exported entity within the same module declaration, then whether
+                        // we prefix depends on the kind of entity. SymbolFlags.ExportHasLocal encompasses all the
+                        // kinds that we do NOT prefix.
                         var exportSymbol = getMergedSymbol(symbol.exportSymbol);
-                        if (!prefixLocals && exportSymbol.flags & 944 && !(exportSymbol.flags & 3)) {
+                        if (!prefixLocals && exportSymbol.flags & 944 /* ExportHasLocal */ && !(exportSymbol.flags & 3 /* Variable */)) {
                             return undefined;
                         }
                         symbol = exportSymbol;
                     }
                     var parentSymbol_1 = getParentOfSymbol(symbol);
                     if (parentSymbol_1) {
-                        if (parentSymbol_1.flags & 512 && parentSymbol_1.valueDeclaration.kind === 274) {
+                        if (parentSymbol_1.flags & 512 /* ValueModule */ && parentSymbol_1.valueDeclaration.kind === 274 /* SourceFile */) {
                             var symbolFile = parentSymbol_1.valueDeclaration;
                             var referenceFile = ts.getSourceFileOfNode(node);
+                            // If `node` accesses an export and that export isn't in the same file, then symbol is a namespace export, so return undefined.
                             var symbolIsUmdExport = symbolFile !== referenceFile;
                             return symbolIsUmdExport ? undefined : symbolFile;
                         }
@@ -43537,30 +53210,50 @@ var ts;
                 }
             }
         }
+        // When resolved as an expression identifier, if the given node references an import, return the declaration of
+        // that import. Otherwise, return undefined.
         function getReferencedImportDeclaration(nodeIn) {
             var node = ts.getParseTreeNode(nodeIn, ts.isIdentifier);
             if (node) {
                 var symbol = getReferencedValueSymbol(node);
-                if (isNonLocalAlias(symbol, 67216319)) {
+                // We should only get the declaration of an alias if there isn't a local value
+                // declaration for the symbol
+                if (isNonLocalAlias(symbol, /*excludes*/ 67216319 /* Value */)) {
                     return getDeclarationOfAliasSymbol(symbol);
                 }
             }
             return undefined;
         }
         function isSymbolOfDeclarationWithCollidingName(symbol) {
-            if (symbol.flags & 418) {
+            if (symbol.flags & 418 /* BlockScoped */) {
                 var links = getSymbolLinks(symbol);
                 if (links.isDeclarationWithCollidingName === undefined) {
                     var container = ts.getEnclosingBlockScopeContainer(symbol.valueDeclaration);
                     if (ts.isStatementWithLocals(container)) {
                         var nodeLinks_1 = getNodeLinks(symbol.valueDeclaration);
-                        if (resolveName(container.parent, symbol.escapedName, 67216319, undefined, undefined, false)) {
+                        if (resolveName(container.parent, symbol.escapedName, 67216319 /* Value */, /*nameNotFoundMessage*/ undefined, /*nameArg*/ undefined, /*isUse*/ false)) {
+                            // redeclaration - always should be renamed
                             links.isDeclarationWithCollidingName = true;
                         }
-                        else if (nodeLinks_1.flags & 131072) {
-                            var isDeclaredInLoop = nodeLinks_1.flags & 262144;
-                            var inLoopInitializer = ts.isIterationStatement(container, false);
-                            var inLoopBodyBlock = container.kind === 213 && ts.isIterationStatement(container.parent, false);
+                        else if (nodeLinks_1.flags & 131072 /* CapturedBlockScopedBinding */) {
+                            // binding is captured in the function
+                            // should be renamed if:
+                            // - binding is not top level - top level bindings never collide with anything
+                            // AND
+                            //   - binding is not declared in loop, should be renamed to avoid name reuse across siblings
+                            //     let a, b
+                            //     { let x = 1; a = () => x; }
+                            //     { let x = 100; b = () => x; }
+                            //     console.log(a()); // should print '1'
+                            //     console.log(b()); // should print '100'
+                            //     OR
+                            //   - binding is declared inside loop but not in inside initializer of iteration statement or directly inside loop body
+                            //     * variables from initializer are passed to rewritten loop body as parameters so they are not captured directly
+                            //     * variables that are declared immediately in loop body will become top level variable after loop is rewritten and thus
+                            //       they will not collide with anything
+                            var isDeclaredInLoop = nodeLinks_1.flags & 262144 /* BlockScopedBindingInLoop */;
+                            var inLoopInitializer = ts.isIterationStatement(container, /*lookInLabeledStatements*/ false);
+                            var inLoopBodyBlock = container.kind === 213 /* Block */ && ts.isIterationStatement(container.parent, /*lookInLabeledStatements*/ false);
                             links.isDeclarationWithCollidingName = !ts.isBlockScopedContainerTopLevel(container) && (!isDeclaredInLoop || (!inLoopInitializer && !inLoopBodyBlock));
                         }
                         else {
@@ -43572,6 +53265,9 @@ var ts;
             }
             return false;
         }
+        // When resolved as an expression identifier, if the given node references a nested block scoped entity with
+        // a name that either hides an existing name or might hide it when compiled downlevel,
+        // return the declaration of that entity. Otherwise, return undefined.
         function getReferencedDeclarationWithCollidingName(nodeIn) {
             if (!ts.isGeneratedIdentifier(nodeIn)) {
                 var node = ts.getParseTreeNode(nodeIn, ts.isIdentifier);
@@ -43584,6 +53280,8 @@ var ts;
             }
             return undefined;
         }
+        // Return true if the given node is a declaration of a nested block scoped entity with a name that either hides an
+        // existing name or might hide a name when compiled downlevel
         function isDeclarationWithCollidingName(nodeIn) {
             var node = ts.getParseTreeNode(nodeIn, ts.isDeclaration);
             if (node) {
@@ -43596,18 +53294,18 @@ var ts;
         }
         function isValueAliasDeclaration(node) {
             switch (node.kind) {
-                case 243:
-                case 245:
-                case 246:
-                case 248:
-                case 252:
+                case 243 /* ImportEqualsDeclaration */:
+                case 245 /* ImportClause */:
+                case 246 /* NamespaceImport */:
+                case 248 /* ImportSpecifier */:
+                case 252 /* ExportSpecifier */:
                     return isAliasResolvedToValue(getSymbolOfNode(node) || unknownSymbol);
-                case 250:
+                case 250 /* ExportDeclaration */:
                     var exportClause = node.exportClause;
                     return !!exportClause && ts.some(exportClause.elements, isValueAliasDeclaration);
-                case 249:
+                case 249 /* ExportAssignment */:
                     return node.expression
-                        && node.expression.kind === 71
+                        && node.expression.kind === 71 /* Identifier */
                         ? isAliasResolvedToValue(getSymbolOfNode(node) || unknownSymbol)
                         : true;
             }
@@ -43615,7 +53313,8 @@ var ts;
         }
         function isTopLevelValueImportEqualsWithEntityName(nodeIn) {
             var node = ts.getParseTreeNode(nodeIn, ts.isImportEqualsDeclaration);
-            if (node === undefined || node.parent.kind !== 274 || !ts.isInternalModuleImportEqualsDeclaration(node)) {
+            if (node === undefined || node.parent.kind !== 274 /* SourceFile */ || !ts.isInternalModuleImportEqualsDeclaration(node)) {
+                // parent is not source file or it is not reference to internal module
                 return false;
             }
             var isValue = isAliasResolvedToValue(getSymbolOfNode(node));
@@ -43626,7 +53325,9 @@ var ts;
             if (target === unknownSymbol) {
                 return true;
             }
-            return !!(target.flags & 67216319) &&
+            // const enums and modules that contain only const enums are not considered values from the emit perspective
+            // unless 'preserveConstEnums' option is set to true
+            return !!(target.flags & 67216319 /* Value */) &&
                 (compilerOptions.preserveConstEnums || !isConstEnumOrConstEnumOnlyModule(target));
         }
         function isConstEnumOrConstEnumOnlyModule(s) {
@@ -43638,8 +53339,9 @@ var ts;
                 if (symbol && getSymbolLinks(symbol).referenced) {
                     return true;
                 }
-                var target = getSymbolLinks(symbol).target;
-                if (target && ts.getModifierFlags(node) & 1 && target.flags & 67216319) {
+                var target = getSymbolLinks(symbol).target; // TODO: GH#18217
+                if (target && ts.getModifierFlags(node) & 1 /* Export */ && target.flags & 67216319 /* Value */) {
+                    // An `export import ... =` of a value symbol is always considered referenced
                     return true;
                 }
             }
@@ -43651,10 +53353,21 @@ var ts;
         function isImplementationOfOverload(node) {
             if (ts.nodeIsPresent(node.body)) {
                 if (ts.isGetAccessor(node) || ts.isSetAccessor(node))
-                    return false;
+                    return false; // Get or set accessors can never be overload implementations, but can have up to 2 signatures
                 var symbol = getSymbolOfNode(node);
                 var signaturesOfSymbol = getSignaturesOfSymbol(symbol);
+                // If this function body corresponds to function with multiple signature, it is implementation of overload
+                // e.g.: function foo(a: string): string;
+                //       function foo(a: number): number;
+                //       function foo(a: any) { // This is implementation of the overloads
+                //           return a;
+                //       }
                 return signaturesOfSymbol.length > 1 ||
+                    // If there is single signature for the symbol, it is overload if that signature isn't coming from the node
+                    // e.g.: function foo(a: string): string;
+                    //       function foo(a: any) { // This is implementation of the overloads
+                    //           return a;
+                    //       }
                     (signaturesOfSymbol.length === 1 && signaturesOfSymbol[0].declaration !== node);
             }
             return false;
@@ -43664,13 +53377,13 @@ var ts;
                 !isOptionalParameter(parameter) &&
                 !ts.isJSDocParameterTag(parameter) &&
                 !!parameter.initializer &&
-                !ts.hasModifier(parameter, 92);
+                !ts.hasModifier(parameter, 92 /* ParameterPropertyModifier */);
         }
         function isOptionalUninitializedParameterProperty(parameter) {
             return strictNullChecks &&
                 isOptionalParameter(parameter) &&
                 !parameter.initializer &&
-                ts.hasModifier(parameter, 92);
+                ts.hasModifier(parameter, 92 /* ParameterPropertyModifier */);
         }
         function getNodeCheckFlags(node) {
             return getNodeLinks(node).flags || 0;
@@ -43681,19 +53394,20 @@ var ts;
         }
         function canHaveConstantValue(node) {
             switch (node.kind) {
-                case 273:
-                case 185:
-                case 186:
+                case 273 /* EnumMember */:
+                case 185 /* PropertyAccessExpression */:
+                case 186 /* ElementAccessExpression */:
                     return true;
             }
             return false;
         }
         function getConstantValue(node) {
-            if (node.kind === 273) {
+            if (node.kind === 273 /* EnumMember */) {
                 return getEnumMemberValue(node);
             }
             var symbol = getNodeLinks(node).resolvedSymbol;
-            if (symbol && (symbol.flags & 8)) {
+            if (symbol && (symbol.flags & 8 /* EnumMember */)) {
+                // inline property\index accesses only for const enums
                 if (ts.isConstEnumDeclaration(symbol.valueDeclaration.parent)) {
                     return getEnumMemberValue(symbol.valueDeclaration);
                 }
@@ -43701,9 +53415,10 @@ var ts;
             return undefined;
         }
         function isFunctionType(type) {
-            return !!(type.flags & 131072) && getSignaturesOfType(type, 0).length > 0;
+            return !!(type.flags & 131072 /* Object */) && getSignaturesOfType(type, 0 /* Call */).length > 0;
         }
         function getTypeReferenceSerializationKind(typeNameIn, location) {
+            // ensure both `typeName` and `location` are parse tree nodes.
             var typeName = ts.getParseTreeNode(typeNameIn, ts.isEntityName);
             if (!typeName)
                 return ts.TypeReferenceSerializationKind.Unknown;
@@ -43712,10 +53427,12 @@ var ts;
                 if (!location)
                     return ts.TypeReferenceSerializationKind.Unknown;
             }
-            var valueSymbol = resolveEntityName(typeName, 67216319, true, false, location);
-            var typeSymbol = resolveEntityName(typeName, 67901928, true, false, location);
+            // Resolve the symbol as a value to ensure the type can be reached at runtime during emit.
+            var valueSymbol = resolveEntityName(typeName, 67216319 /* Value */, /*ignoreErrors*/ true, /*dontResolveAlias*/ false, location);
+            // Resolve the symbol as a type so that we can provide a more useful hint for the type serializer.
+            var typeSymbol = resolveEntityName(typeName, 67901928 /* Type */, /*ignoreErrors*/ true, /*dontResolveAlias*/ false, location);
             if (valueSymbol && valueSymbol === typeSymbol) {
-                var globalPromiseSymbol = getGlobalPromiseConstructorSymbol(false);
+                var globalPromiseSymbol = getGlobalPromiseConstructorSymbol(/*reportErrors*/ false);
                 if (globalPromiseSymbol && valueSymbol === globalPromiseSymbol) {
                     return ts.TypeReferenceSerializationKind.Promise;
                 }
@@ -43724,6 +53441,7 @@ var ts;
                     return ts.TypeReferenceSerializationKind.TypeWithConstructSignatureAndValue;
                 }
             }
+            // We might not be able to resolve type symbol so use unknown type in that case (eg error case)
             if (!typeSymbol) {
                 return ts.TypeReferenceSerializationKind.Unknown;
             }
@@ -43731,25 +53449,25 @@ var ts;
             if (type === errorType) {
                 return ts.TypeReferenceSerializationKind.Unknown;
             }
-            else if (type.flags & 3) {
+            else if (type.flags & 3 /* AnyOrUnknown */) {
                 return ts.TypeReferenceSerializationKind.ObjectType;
             }
-            else if (isTypeAssignableToKind(type, 4096 | 24576 | 32768)) {
+            else if (isTypeAssignableToKind(type, 4096 /* Void */ | 24576 /* Nullable */ | 32768 /* Never */)) {
                 return ts.TypeReferenceSerializationKind.VoidNullableOrNeverType;
             }
-            else if (isTypeAssignableToKind(type, 272)) {
+            else if (isTypeAssignableToKind(type, 272 /* BooleanLike */)) {
                 return ts.TypeReferenceSerializationKind.BooleanType;
             }
-            else if (isTypeAssignableToKind(type, 168)) {
+            else if (isTypeAssignableToKind(type, 168 /* NumberLike */)) {
                 return ts.TypeReferenceSerializationKind.NumberLikeType;
             }
-            else if (isTypeAssignableToKind(type, 68)) {
+            else if (isTypeAssignableToKind(type, 68 /* StringLike */)) {
                 return ts.TypeReferenceSerializationKind.StringLikeType;
             }
             else if (isTupleType(type)) {
                 return ts.TypeReferenceSerializationKind.ArrayLikeType;
             }
-            else if (isTypeAssignableToKind(type, 3072)) {
+            else if (isTypeAssignableToKind(type, 3072 /* ESSymbolLike */)) {
                 return ts.TypeReferenceSerializationKind.ESSymbolType;
             }
             else if (isFunctionType(type)) {
@@ -43765,36 +53483,37 @@ var ts;
         function createTypeOfDeclaration(declarationIn, enclosingDeclaration, flags, tracker, addUndefined) {
             var declaration = ts.getParseTreeNode(declarationIn, ts.isVariableLikeOrAccessor);
             if (!declaration) {
-                return ts.createToken(119);
+                return ts.createToken(119 /* AnyKeyword */);
             }
+            // Get type of the symbol if this is the valid symbol otherwise get type at location
             var symbol = getSymbolOfNode(declaration);
-            var type = symbol && !(symbol.flags & (2048 | 131072))
+            var type = symbol && !(symbol.flags & (2048 /* TypeLiteral */ | 131072 /* Signature */))
                 ? getWidenedLiteralType(getTypeOfSymbol(symbol))
                 : errorType;
-            if (type.flags & 2048 &&
+            if (type.flags & 2048 /* UniqueESSymbol */ &&
                 type.symbol === symbol) {
-                flags |= 1048576;
+                flags |= 1048576 /* AllowUniqueESSymbolType */;
             }
             if (addUndefined) {
                 type = getOptionalType(type);
             }
-            return nodeBuilder.typeToTypeNode(type, enclosingDeclaration, flags | 1024, tracker);
+            return nodeBuilder.typeToTypeNode(type, enclosingDeclaration, flags | 1024 /* MultilineObjectLiterals */, tracker);
         }
         function createReturnTypeOfSignatureDeclaration(signatureDeclarationIn, enclosingDeclaration, flags, tracker) {
             var signatureDeclaration = ts.getParseTreeNode(signatureDeclarationIn, ts.isFunctionLike);
             if (!signatureDeclaration) {
-                return ts.createToken(119);
+                return ts.createToken(119 /* AnyKeyword */);
             }
             var signature = getSignatureFromDeclaration(signatureDeclaration);
-            return nodeBuilder.typeToTypeNode(getReturnTypeOfSignature(signature), enclosingDeclaration, flags | 1024, tracker);
+            return nodeBuilder.typeToTypeNode(getReturnTypeOfSignature(signature), enclosingDeclaration, flags | 1024 /* MultilineObjectLiterals */, tracker);
         }
         function createTypeOfExpression(exprIn, enclosingDeclaration, flags, tracker) {
             var expr = ts.getParseTreeNode(exprIn, ts.isExpression);
             if (!expr) {
-                return ts.createToken(119);
+                return ts.createToken(119 /* AnyKeyword */);
             }
             var type = getWidenedType(getRegularTypeOfExpression(expr));
-            return nodeBuilder.typeToTypeNode(type, enclosingDeclaration, flags | 1024, tracker);
+            return nodeBuilder.typeToTypeNode(type, enclosingDeclaration, flags | 1024 /* MultilineObjectLiterals */, tracker);
         }
         function hasGlobalName(name) {
             return globals.has(ts.escapeLeadingUnderscores(name));
@@ -43806,12 +53525,14 @@ var ts;
             }
             var location = reference;
             if (startInDeclarationContainer) {
+                // When resolving the name of a declaration as a value, we need to start resolution
+                // at a point outside of the declaration.
                 var parent = reference.parent;
                 if (ts.isDeclaration(parent) && reference === parent.name) {
                     location = getDeclarationContainer(parent);
                 }
             }
-            return resolveName(location, reference.escapedText, 67216319 | 1048576 | 2097152, undefined, undefined, true);
+            return resolveName(location, reference.escapedText, 67216319 /* Value */ | 1048576 /* ExportValue */ | 2097152 /* Alias */, /*nodeNotFoundMessage*/ undefined, /*nameArg*/ undefined, /*isUse*/ true);
         }
         function getReferencedValueDeclaration(referenceIn) {
             if (!ts.isGeneratedIdentifier(referenceIn)) {
@@ -43828,7 +53549,7 @@ var ts;
         function isLiteralConstDeclaration(node) {
             if (ts.isConst(node)) {
                 var type = getTypeOfSymbol(getSymbolOfNode(node));
-                return !!(type.flags & 192 && type.flags & 33554432);
+                return !!(type.flags & 192 /* StringOrNumberLiteral */ && type.flags & 33554432 /* FreshLiteral */);
             }
             return false;
         }
@@ -43840,9 +53561,12 @@ var ts;
             return literalTypeToNode(type);
         }
         function createResolver() {
+            // this variable and functions that use it are deliberately moved here from the outer scope
+            // to avoid scope pollution
             var resolvedTypeReferenceDirectives = host.getResolvedTypeReferenceDirectives();
             var fileToDirective;
             if (resolvedTypeReferenceDirectives) {
+                // populate reverse mapping: file path -> type reference directive that was resolved to this file
                 fileToDirective = ts.createMap();
                 resolvedTypeReferenceDirectives.forEach(function (resolvedDirective, key) {
                     if (!resolvedDirective || !resolvedDirective.resolvedFileName) {
@@ -43859,11 +53583,13 @@ var ts;
                 isDeclarationWithCollidingName: isDeclarationWithCollidingName,
                 isValueAliasDeclaration: function (node) {
                     node = ts.getParseTreeNode(node);
+                    // Synthesized nodes are always treated like values.
                     return node ? isValueAliasDeclaration(node) : true;
                 },
                 hasGlobalName: hasGlobalName,
                 isReferencedAliasDeclaration: function (node, checkChildren) {
                     node = ts.getParseTreeNode(node);
+                    // Synthesized nodes are always treated as referenced.
                     return node ? isReferencedAliasDeclaration(node, checkChildren) : true;
                 },
                 getNodeCheckFlags: function (node) {
@@ -43898,17 +53624,17 @@ var ts;
                 isLateBound: function (nodeIn) {
                     var node = ts.getParseTreeNode(nodeIn, ts.isDeclaration);
                     var symbol = node && getSymbolOfNode(node);
-                    return !!(symbol && ts.getCheckFlags(symbol) & 1024);
+                    return !!(symbol && ts.getCheckFlags(symbol) & 1024 /* Late */);
                 },
                 getJsxFactoryEntity: function (location) { return location ? (getJsxNamespace(location), (ts.getSourceFileOfNode(location).localJsxFactory || _jsxFactoryEntity)) : _jsxFactoryEntity; },
                 getAllAccessorDeclarations: function (accessor) {
-                    accessor = ts.getParseTreeNode(accessor, ts.isGetOrSetAccessorDeclaration);
-                    var otherKind = accessor.kind === 157 ? 156 : 157;
+                    accessor = ts.getParseTreeNode(accessor, ts.isGetOrSetAccessorDeclaration); // TODO: GH#18217
+                    var otherKind = accessor.kind === 157 /* SetAccessor */ ? 156 /* GetAccessor */ : 157 /* SetAccessor */;
                     var otherAccessor = ts.getDeclarationOfKind(getSymbolOfNode(accessor), otherKind);
                     var firstAccessor = otherAccessor && (otherAccessor.pos < accessor.pos) ? otherAccessor : accessor;
                     var secondAccessor = otherAccessor && (otherAccessor.pos < accessor.pos) ? accessor : otherAccessor;
-                    var setAccessor = accessor.kind === 157 ? accessor : otherAccessor;
-                    var getAccessor = accessor.kind === 156 ? accessor : otherAccessor;
+                    var setAccessor = accessor.kind === 157 /* SetAccessor */ ? accessor : otherAccessor;
+                    var getAccessor = accessor.kind === 156 /* GetAccessor */ ? accessor : otherAccessor;
                     return {
                         firstAccessor: firstAccessor,
                         secondAccessor: secondAccessor,
@@ -43918,29 +53644,38 @@ var ts;
                 }
             };
             function isInHeritageClause(node) {
-                return node.parent && node.parent.kind === 207 && node.parent.parent && node.parent.parent.kind === 268;
+                return node.parent && node.parent.kind === 207 /* ExpressionWithTypeArguments */ && node.parent.parent && node.parent.parent.kind === 268 /* HeritageClause */;
             }
+            // defined here to avoid outer scope pollution
             function getTypeReferenceDirectivesForEntityName(node) {
+                // program does not have any files with type reference directives - bail out
                 if (!fileToDirective) {
                     return undefined;
                 }
-                var meaning = 67901928 | 1920;
-                if ((node.kind === 71 && isInTypeQuery(node)) || (node.kind === 185 && !isInHeritageClause(node))) {
-                    meaning = 67216319 | 1048576;
+                // property access can only be used as values, or types when within an expression with type arguments inside a heritage clause
+                // qualified names can only be used as types\namespaces
+                // identifiers are treated as values only if they appear in type queries
+                var meaning = 67901928 /* Type */ | 1920 /* Namespace */;
+                if ((node.kind === 71 /* Identifier */ && isInTypeQuery(node)) || (node.kind === 185 /* PropertyAccessExpression */ && !isInHeritageClause(node))) {
+                    meaning = 67216319 /* Value */ | 1048576 /* ExportValue */;
                 }
-                var symbol = resolveEntityName(node, meaning, true);
+                var symbol = resolveEntityName(node, meaning, /*ignoreErrors*/ true);
                 return symbol && symbol !== unknownSymbol ? getTypeReferenceDirectivesForSymbol(symbol, meaning) : undefined;
             }
+            // defined here to avoid outer scope pollution
             function getTypeReferenceDirectivesForSymbol(symbol, meaning) {
+                // program does not have any files with type reference directives - bail out
                 if (!fileToDirective) {
                     return undefined;
                 }
                 if (!isSymbolFromTypeDeclarationFile(symbol)) {
                     return undefined;
                 }
+                // check what declarations in the symbol can contribute to the target meaning
                 var typeReferenceDirectives;
                 for (var _i = 0, _a = symbol.declarations; _i < _a.length; _i++) {
                     var decl = _a[_i];
+                    // check meaning of the local symbol to see if declaration needs to be analyzed further
                     if (decl.symbol && decl.symbol.flags & meaning) {
                         var file = ts.getSourceFileOfNode(decl);
                         var typeReferenceDirective = fileToDirective.get(file.path);
@@ -43948,6 +53683,7 @@ var ts;
                             (typeReferenceDirectives || (typeReferenceDirectives = [])).push(typeReferenceDirective);
                         }
                         else {
+                            // found at least one entry that does not originate from type reference directive
                             return undefined;
                         }
                     }
@@ -43955,9 +53691,12 @@ var ts;
                 return typeReferenceDirectives;
             }
             function isSymbolFromTypeDeclarationFile(symbol) {
+                // bail out if symbol does not have associated declarations (i.e. this is transient symbol created for property in binding pattern)
                 if (!symbol.declarations) {
                     return false;
                 }
+                // walk the parent chain for symbols to make sure that top level parent symbol is in the global scope
+                // external modules cannot define or contribute to type declaration files
                 var current = symbol;
                 while (true) {
                     var parent = getParentOfSymbol(current);
@@ -43968,9 +53707,10 @@ var ts;
                         break;
                     }
                 }
-                if (current.valueDeclaration && current.valueDeclaration.kind === 274 && current.flags & 512) {
+                if (current.valueDeclaration && current.valueDeclaration.kind === 274 /* SourceFile */ && current.flags & 512 /* ValueModule */) {
                     return false;
                 }
+                // check that at least one declaration of top level symbol originates from type declaration file
                 for (var _i = 0, _a = symbol.declarations; _i < _a.length; _i++) {
                     var decl = _a[_i];
                     var file = ts.getSourceFileOfNode(decl);
@@ -43982,18 +53722,20 @@ var ts;
             }
         }
         function getExternalModuleFileFromDeclaration(declaration) {
-            var specifier = declaration.kind === 239 ? ts.tryCast(declaration.name, ts.isStringLiteral) : ts.getExternalModuleName(declaration);
-            var moduleSymbol = resolveExternalModuleNameWorker(specifier, specifier, undefined);
+            var specifier = declaration.kind === 239 /* ModuleDeclaration */ ? ts.tryCast(declaration.name, ts.isStringLiteral) : ts.getExternalModuleName(declaration);
+            var moduleSymbol = resolveExternalModuleNameWorker(specifier, specifier, /*moduleNotFoundError*/ undefined); // TODO: GH#18217
             if (!moduleSymbol) {
                 return undefined;
             }
-            return ts.getDeclarationOfKind(moduleSymbol, 274);
+            return ts.getDeclarationOfKind(moduleSymbol, 274 /* SourceFile */);
         }
         function initializeTypeChecker() {
+            // Bind all source files and propagate errors
             for (var _i = 0, _a = host.getSourceFiles(); _i < _a.length; _i++) {
                 var file = _a[_i];
                 ts.bindSourceFile(file, compilerOptions);
             }
+            // Initialize global symbol table
             var augmentations;
             for (var _b = 0, _c = host.getSourceFiles(); _b < _c.length; _b++) {
                 var file = _c[_b];
@@ -44007,6 +53749,7 @@ var ts;
                     (augmentations || (augmentations = [])).push(file.moduleAugmentations);
                 }
                 if (file.symbol && file.symbol.globalExports) {
+                    // Merge in UMD exports with first-in-wins semantics (see #9771)
                     var source = file.symbol.globalExports;
                     source.forEach(function (sourceSymbol, id) {
                         if (!globals.has(id)) {
@@ -44015,7 +53758,15 @@ var ts;
                     });
                 }
             }
+            // We do global augmentations separately from module augmentations (and before creating global types) because they
+            //  1. Affect global types. We won't have the correct global types until global augmentations are merged. Also,
+            //  2. Module augmentation instantiation requires creating the type of a module, which, in turn, can require
+            //       checking for an export or property on the module (if export=) which, in turn, can fall back to the
+            //       apparent type of the module - either globalObjectType or globalFunctionType - which wouldn't exist if we
+            //       did module augmentations prior to finalizing the global types.
             if (augmentations) {
+                // merge _global_ module augmentations.
+                // this needs to be done after global symbol table is initialized to make sure that all ambient modules are indexed
                 for (var _d = 0, augmentations_1 = augmentations; _d < augmentations_1.length; _d++) {
                     var list = augmentations_1[_d];
                     for (var _e = 0, list_1 = list; _e < list_1.length; _e++) {
@@ -44026,26 +53777,31 @@ var ts;
                     }
                 }
             }
+            // Setup global builtins
             addToSymbolTable(globals, builtinGlobals, ts.Diagnostics.Declaration_name_conflicts_with_built_in_global_identifier_0);
             getSymbolLinks(undefinedSymbol).type = undefinedWideningType;
-            getSymbolLinks(argumentsSymbol).type = getGlobalType("IArguments", 0, true);
+            getSymbolLinks(argumentsSymbol).type = getGlobalType("IArguments", /*arity*/ 0, /*reportErrors*/ true);
             getSymbolLinks(unknownSymbol).type = errorType;
-            globalArrayType = getGlobalType("Array", 1, true);
-            globalObjectType = getGlobalType("Object", 0, true);
-            globalFunctionType = getGlobalType("Function", 0, true);
-            globalStringType = getGlobalType("String", 0, true);
-            globalNumberType = getGlobalType("Number", 0, true);
-            globalBooleanType = getGlobalType("Boolean", 0, true);
-            globalRegExpType = getGlobalType("RegExp", 0, true);
+            // Initialize special types
+            globalArrayType = getGlobalType("Array", /*arity*/ 1, /*reportErrors*/ true);
+            globalObjectType = getGlobalType("Object", /*arity*/ 0, /*reportErrors*/ true);
+            globalFunctionType = getGlobalType("Function", /*arity*/ 0, /*reportErrors*/ true);
+            globalStringType = getGlobalType("String", /*arity*/ 0, /*reportErrors*/ true);
+            globalNumberType = getGlobalType("Number", /*arity*/ 0, /*reportErrors*/ true);
+            globalBooleanType = getGlobalType("Boolean", /*arity*/ 0, /*reportErrors*/ true);
+            globalRegExpType = getGlobalType("RegExp", /*arity*/ 0, /*reportErrors*/ true);
             anyArrayType = createArrayType(anyType);
             autoArrayType = createArrayType(autoType);
             if (autoArrayType === emptyObjectType) {
+                // autoArrayType is used as a marker, so even if global Array type is not defined, it needs to be a unique type
                 autoArrayType = createAnonymousType(undefined, emptySymbols, ts.emptyArray, ts.emptyArray, undefined, undefined);
             }
-            globalReadonlyArrayType = getGlobalTypeOrUndefined("ReadonlyArray", 1);
+            globalReadonlyArrayType = getGlobalTypeOrUndefined("ReadonlyArray", /*arity*/ 1);
             anyReadonlyArrayType = globalReadonlyArrayType ? createTypeFromGenericGlobalType(globalReadonlyArrayType, [anyType]) : anyArrayType;
-            globalThisType = getGlobalTypeOrUndefined("ThisType", 1);
+            globalThisType = getGlobalTypeOrUndefined("ThisType", /*arity*/ 1);
             if (augmentations) {
+                // merge _nonglobal_ module augmentations.
+                // this needs to be done after global symbol table is initialized to make sure that all ambient modules are indexed
                 for (var _f = 0, augmentations_2 = augmentations; _f < augmentations_2.length; _f++) {
                     var list = augmentations_2[_f];
                     for (var _g = 0, list_2 = list; _g < list_2.length; _g++) {
@@ -44060,14 +53816,14 @@ var ts;
         function checkExternalEmitHelpers(location, helpers) {
             if ((requestedExternalEmitHelpers & helpers) !== helpers && compilerOptions.importHelpers) {
                 var sourceFile = ts.getSourceFileOfNode(location);
-                if (ts.isEffectiveExternalModule(sourceFile, compilerOptions) && !(location.flags & 4194304)) {
+                if (ts.isEffectiveExternalModule(sourceFile, compilerOptions) && !(location.flags & 4194304 /* Ambient */)) {
                     var helpersModule = resolveHelpersModule(sourceFile, location);
                     if (helpersModule !== unknownSymbol) {
                         var uncheckedHelpers = helpers & ~requestedExternalEmitHelpers;
-                        for (var helper = 1; helper <= 65536; helper <<= 1) {
+                        for (var helper = 1 /* FirstEmitHelper */; helper <= 65536 /* LastEmitHelper */; helper <<= 1) {
                             if (uncheckedHelpers & helper) {
                                 var name = getHelperName(helper);
-                                var symbol = getSymbol(helpersModule.exports, ts.escapeLeadingUnderscores(name), 67216319);
+                                var symbol = getSymbol(helpersModule.exports, ts.escapeLeadingUnderscores(name), 67216319 /* Value */);
                                 if (!symbol) {
                                     error(location, ts.Diagnostics.This_syntax_requires_an_imported_helper_named_1_but_module_0_has_no_exported_member_1, ts.externalHelpersModuleNameText, name);
                                 }
@@ -44080,23 +53836,23 @@ var ts;
         }
         function getHelperName(helper) {
             switch (helper) {
-                case 1: return "__extends";
-                case 2: return "__assign";
-                case 4: return "__rest";
-                case 8: return "__decorate";
-                case 16: return "__metadata";
-                case 32: return "__param";
-                case 64: return "__awaiter";
-                case 128: return "__generator";
-                case 256: return "__values";
-                case 512: return "__read";
-                case 1024: return "__spread";
-                case 2048: return "__await";
-                case 4096: return "__asyncGenerator";
-                case 8192: return "__asyncDelegator";
-                case 16384: return "__asyncValues";
-                case 32768: return "__exportStar";
-                case 65536: return "__makeTemplateObject";
+                case 1 /* Extends */: return "__extends";
+                case 2 /* Assign */: return "__assign";
+                case 4 /* Rest */: return "__rest";
+                case 8 /* Decorate */: return "__decorate";
+                case 16 /* Metadata */: return "__metadata";
+                case 32 /* Param */: return "__param";
+                case 64 /* Awaiter */: return "__awaiter";
+                case 128 /* Generator */: return "__generator";
+                case 256 /* Values */: return "__values";
+                case 512 /* Read */: return "__read";
+                case 1024 /* Spread */: return "__spread";
+                case 2048 /* Await */: return "__await";
+                case 4096 /* AsyncGenerator */: return "__asyncGenerator";
+                case 8192 /* AsyncDelegator */: return "__asyncDelegator";
+                case 16384 /* AsyncValues */: return "__asyncValues";
+                case 32768 /* ExportStar */: return "__exportStar";
+                case 65536 /* MakeTemplateObject */: return "__makeTemplateObject";
                 default: return ts.Debug.fail("Unrecognized helper");
             }
         }
@@ -44106,6 +53862,7 @@ var ts;
             }
             return externalHelpersModule;
         }
+        // GRAMMAR CHECKING
         function checkGrammarDecoratorsAndModifiers(node) {
             return checkGrammarDecorators(node) || checkGrammarModifiers(node);
         }
@@ -44114,14 +53871,14 @@ var ts;
                 return false;
             }
             if (!ts.nodeCanBeDecorated(node, node.parent, node.parent.parent)) {
-                if (node.kind === 154 && !ts.nodeIsPresent(node.body)) {
+                if (node.kind === 154 /* MethodDeclaration */ && !ts.nodeIsPresent(node.body)) {
                     return grammarErrorOnFirstToken(node, ts.Diagnostics.A_decorator_can_only_decorate_a_method_implementation_not_an_overload);
                 }
                 else {
                     return grammarErrorOnFirstToken(node, ts.Diagnostics.Decorators_are_not_valid_here);
                 }
             }
-            else if (node.kind === 156 || node.kind === 157) {
+            else if (node.kind === 156 /* GetAccessor */ || node.kind === 157 /* SetAccessor */) {
                 var accessors = ts.getAllAccessorDeclarations(node.parent.members, node);
                 if (accessors.firstAccessor.decorators && node === accessors.secondAccessor) {
                     return grammarErrorOnFirstToken(node, ts.Diagnostics.Decorators_cannot_be_applied_to_multiple_get_Slashset_accessors_of_the_same_name);
@@ -44135,44 +53892,44 @@ var ts;
                 return quickResult;
             }
             var lastStatic, lastDeclare, lastAsync, lastReadonly;
-            var flags = 0;
+            var flags = 0 /* None */;
             for (var _i = 0, _a = node.modifiers; _i < _a.length; _i++) {
                 var modifier = _a[_i];
-                if (modifier.kind !== 132) {
-                    if (node.kind === 151 || node.kind === 153) {
+                if (modifier.kind !== 132 /* ReadonlyKeyword */) {
+                    if (node.kind === 151 /* PropertySignature */ || node.kind === 153 /* MethodSignature */) {
                         return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_cannot_appear_on_a_type_member, ts.tokenToString(modifier.kind));
                     }
-                    if (node.kind === 160) {
+                    if (node.kind === 160 /* IndexSignature */) {
                         return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_cannot_appear_on_an_index_signature, ts.tokenToString(modifier.kind));
                     }
                 }
                 switch (modifier.kind) {
-                    case 76:
-                        if (node.kind !== 238 && node.parent.kind === 235) {
-                            return grammarErrorOnNode(node, ts.Diagnostics.A_class_member_cannot_have_the_0_keyword, ts.tokenToString(76));
+                    case 76 /* ConstKeyword */:
+                        if (node.kind !== 238 /* EnumDeclaration */ && node.parent.kind === 235 /* ClassDeclaration */) {
+                            return grammarErrorOnNode(node, ts.Diagnostics.A_class_member_cannot_have_the_0_keyword, ts.tokenToString(76 /* ConstKeyword */));
                         }
                         break;
-                    case 114:
-                    case 113:
-                    case 112:
+                    case 114 /* PublicKeyword */:
+                    case 113 /* ProtectedKeyword */:
+                    case 112 /* PrivateKeyword */:
                         var text = visibilityToString(ts.modifierToFlag(modifier.kind));
-                        if (flags & 28) {
+                        if (flags & 28 /* AccessibilityModifier */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics.Accessibility_modifier_already_seen);
                         }
-                        else if (flags & 32) {
+                        else if (flags & 32 /* Static */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_must_precede_1_modifier, text, "static");
                         }
-                        else if (flags & 64) {
+                        else if (flags & 64 /* Readonly */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_must_precede_1_modifier, text, "readonly");
                         }
-                        else if (flags & 256) {
+                        else if (flags & 256 /* Async */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_must_precede_1_modifier, text, "async");
                         }
-                        else if (node.parent.kind === 240 || node.parent.kind === 274) {
+                        else if (node.parent.kind === 240 /* ModuleBlock */ || node.parent.kind === 274 /* SourceFile */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_cannot_appear_on_a_module_or_namespace_element, text);
                         }
-                        else if (flags & 128) {
-                            if (modifier.kind === 112) {
+                        else if (flags & 128 /* Abstract */) {
+                            if (modifier.kind === 112 /* PrivateKeyword */) {
                                 return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_cannot_be_used_with_1_modifier, text, "abstract");
                             }
                             else {
@@ -44181,152 +53938,157 @@ var ts;
                         }
                         flags |= ts.modifierToFlag(modifier.kind);
                         break;
-                    case 115:
-                        if (flags & 32) {
+                    case 115 /* StaticKeyword */:
+                        if (flags & 32 /* Static */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_already_seen, "static");
                         }
-                        else if (flags & 64) {
+                        else if (flags & 64 /* Readonly */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_must_precede_1_modifier, "static", "readonly");
                         }
-                        else if (flags & 256) {
+                        else if (flags & 256 /* Async */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_must_precede_1_modifier, "static", "async");
                         }
-                        else if (node.parent.kind === 240 || node.parent.kind === 274) {
+                        else if (node.parent.kind === 240 /* ModuleBlock */ || node.parent.kind === 274 /* SourceFile */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_cannot_appear_on_a_module_or_namespace_element, "static");
                         }
-                        else if (node.kind === 149) {
+                        else if (node.kind === 149 /* Parameter */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_cannot_appear_on_a_parameter, "static");
                         }
-                        else if (flags & 128) {
+                        else if (flags & 128 /* Abstract */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_cannot_be_used_with_1_modifier, "static", "abstract");
                         }
-                        flags |= 32;
+                        flags |= 32 /* Static */;
                         lastStatic = modifier;
                         break;
-                    case 132:
-                        if (flags & 64) {
+                    case 132 /* ReadonlyKeyword */:
+                        if (flags & 64 /* Readonly */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_already_seen, "readonly");
                         }
-                        else if (node.kind !== 152 && node.kind !== 151 && node.kind !== 160 && node.kind !== 149) {
+                        else if (node.kind !== 152 /* PropertyDeclaration */ && node.kind !== 151 /* PropertySignature */ && node.kind !== 160 /* IndexSignature */ && node.kind !== 149 /* Parameter */) {
+                            // If node.kind === SyntaxKind.Parameter, checkParameter report an error if it's not a parameter property.
                             return grammarErrorOnNode(modifier, ts.Diagnostics.readonly_modifier_can_only_appear_on_a_property_declaration_or_index_signature);
                         }
-                        flags |= 64;
+                        flags |= 64 /* Readonly */;
                         lastReadonly = modifier;
                         break;
-                    case 84:
-                        if (flags & 1) {
+                    case 84 /* ExportKeyword */:
+                        if (flags & 1 /* Export */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_already_seen, "export");
                         }
-                        else if (flags & 2) {
+                        else if (flags & 2 /* Ambient */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_must_precede_1_modifier, "export", "declare");
                         }
-                        else if (flags & 128) {
+                        else if (flags & 128 /* Abstract */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_must_precede_1_modifier, "export", "abstract");
                         }
-                        else if (flags & 256) {
+                        else if (flags & 256 /* Async */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_must_precede_1_modifier, "export", "async");
                         }
-                        else if (node.parent.kind === 235) {
+                        else if (node.parent.kind === 235 /* ClassDeclaration */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_cannot_appear_on_a_class_element, "export");
                         }
-                        else if (node.kind === 149) {
+                        else if (node.kind === 149 /* Parameter */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_cannot_appear_on_a_parameter, "export");
                         }
-                        flags |= 1;
+                        flags |= 1 /* Export */;
                         break;
-                    case 79:
-                        var container = node.parent.kind === 274 ? node.parent : node.parent.parent;
-                        if (container.kind === 239 && !ts.isAmbientModule(container)) {
+                    case 79 /* DefaultKeyword */:
+                        var container = node.parent.kind === 274 /* SourceFile */ ? node.parent : node.parent.parent;
+                        if (container.kind === 239 /* ModuleDeclaration */ && !ts.isAmbientModule(container)) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics.A_default_export_can_only_be_used_in_an_ECMAScript_style_module);
                         }
-                        flags |= 512;
+                        flags |= 512 /* Default */;
                         break;
-                    case 124:
-                        if (flags & 2) {
+                    case 124 /* DeclareKeyword */:
+                        if (flags & 2 /* Ambient */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_already_seen, "declare");
                         }
-                        else if (flags & 256) {
+                        else if (flags & 256 /* Async */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_cannot_be_used_in_an_ambient_context, "async");
                         }
-                        else if (node.parent.kind === 235) {
+                        else if (node.parent.kind === 235 /* ClassDeclaration */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_cannot_appear_on_a_class_element, "declare");
                         }
-                        else if (node.kind === 149) {
+                        else if (node.kind === 149 /* Parameter */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_cannot_appear_on_a_parameter, "declare");
                         }
-                        else if ((node.parent.flags & 4194304) && node.parent.kind === 240) {
+                        else if ((node.parent.flags & 4194304 /* Ambient */) && node.parent.kind === 240 /* ModuleBlock */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics.A_declare_modifier_cannot_be_used_in_an_already_ambient_context);
                         }
-                        flags |= 2;
+                        flags |= 2 /* Ambient */;
                         lastDeclare = modifier;
                         break;
-                    case 117:
-                        if (flags & 128) {
+                    case 117 /* AbstractKeyword */:
+                        if (flags & 128 /* Abstract */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_already_seen, "abstract");
                         }
-                        if (node.kind !== 235) {
-                            if (node.kind !== 154 &&
-                                node.kind !== 152 &&
-                                node.kind !== 156 &&
-                                node.kind !== 157) {
+                        if (node.kind !== 235 /* ClassDeclaration */) {
+                            if (node.kind !== 154 /* MethodDeclaration */ &&
+                                node.kind !== 152 /* PropertyDeclaration */ &&
+                                node.kind !== 156 /* GetAccessor */ &&
+                                node.kind !== 157 /* SetAccessor */) {
                                 return grammarErrorOnNode(modifier, ts.Diagnostics.abstract_modifier_can_only_appear_on_a_class_method_or_property_declaration);
                             }
-                            if (!(node.parent.kind === 235 && ts.hasModifier(node.parent, 128))) {
+                            if (!(node.parent.kind === 235 /* ClassDeclaration */ && ts.hasModifier(node.parent, 128 /* Abstract */))) {
                                 return grammarErrorOnNode(modifier, ts.Diagnostics.Abstract_methods_can_only_appear_within_an_abstract_class);
                             }
-                            if (flags & 32) {
+                            if (flags & 32 /* Static */) {
                                 return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_cannot_be_used_with_1_modifier, "static", "abstract");
                             }
-                            if (flags & 8) {
+                            if (flags & 8 /* Private */) {
                                 return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_cannot_be_used_with_1_modifier, "private", "abstract");
                             }
                         }
-                        flags |= 128;
+                        flags |= 128 /* Abstract */;
                         break;
-                    case 120:
-                        if (flags & 256) {
+                    case 120 /* AsyncKeyword */:
+                        if (flags & 256 /* Async */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_already_seen, "async");
                         }
-                        else if (flags & 2 || node.parent.flags & 4194304) {
+                        else if (flags & 2 /* Ambient */ || node.parent.flags & 4194304 /* Ambient */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_cannot_be_used_in_an_ambient_context, "async");
                         }
-                        else if (node.kind === 149) {
+                        else if (node.kind === 149 /* Parameter */) {
                             return grammarErrorOnNode(modifier, ts.Diagnostics._0_modifier_cannot_appear_on_a_parameter, "async");
                         }
-                        flags |= 256;
+                        flags |= 256 /* Async */;
                         lastAsync = modifier;
                         break;
                 }
             }
-            if (node.kind === 155) {
-                if (flags & 32) {
+            if (node.kind === 155 /* Constructor */) {
+                if (flags & 32 /* Static */) {
                     return grammarErrorOnNode(lastStatic, ts.Diagnostics._0_modifier_cannot_appear_on_a_constructor_declaration, "static");
                 }
-                if (flags & 128) {
-                    return grammarErrorOnNode(lastStatic, ts.Diagnostics._0_modifier_cannot_appear_on_a_constructor_declaration, "abstract");
+                if (flags & 128 /* Abstract */) {
+                    return grammarErrorOnNode(lastStatic, ts.Diagnostics._0_modifier_cannot_appear_on_a_constructor_declaration, "abstract"); // TODO: GH#18217
                 }
-                else if (flags & 256) {
+                else if (flags & 256 /* Async */) {
                     return grammarErrorOnNode(lastAsync, ts.Diagnostics._0_modifier_cannot_appear_on_a_constructor_declaration, "async");
                 }
-                else if (flags & 64) {
+                else if (flags & 64 /* Readonly */) {
                     return grammarErrorOnNode(lastReadonly, ts.Diagnostics._0_modifier_cannot_appear_on_a_constructor_declaration, "readonly");
                 }
                 return false;
             }
-            else if ((node.kind === 244 || node.kind === 243) && flags & 2) {
+            else if ((node.kind === 244 /* ImportDeclaration */ || node.kind === 243 /* ImportEqualsDeclaration */) && flags & 2 /* Ambient */) {
                 return grammarErrorOnNode(lastDeclare, ts.Diagnostics.A_0_modifier_cannot_be_used_with_an_import_declaration, "declare");
             }
-            else if (node.kind === 149 && (flags & 92) && ts.isBindingPattern(node.name)) {
+            else if (node.kind === 149 /* Parameter */ && (flags & 92 /* ParameterPropertyModifier */) && ts.isBindingPattern(node.name)) {
                 return grammarErrorOnNode(node, ts.Diagnostics.A_parameter_property_may_not_be_declared_using_a_binding_pattern);
             }
-            else if (node.kind === 149 && (flags & 92) && node.dotDotDotToken) {
+            else if (node.kind === 149 /* Parameter */ && (flags & 92 /* ParameterPropertyModifier */) && node.dotDotDotToken) {
                 return grammarErrorOnNode(node, ts.Diagnostics.A_parameter_property_cannot_be_declared_using_a_rest_parameter);
             }
-            if (flags & 256) {
+            if (flags & 256 /* Async */) {
                 return checkGrammarAsyncModifier(node, lastAsync);
             }
             return false;
         }
+        /**
+         * true | false: Early return this value from checkGrammarModifiers.
+         * undefined: Need to do full checking on the modifiers.
+         */
         function reportObviousModifierErrors(node) {
             return !node.modifiers
                 ? false
@@ -44336,38 +54098,38 @@ var ts;
         }
         function shouldReportBadModifier(node) {
             switch (node.kind) {
-                case 156:
-                case 157:
-                case 155:
-                case 152:
-                case 151:
-                case 154:
-                case 153:
-                case 160:
-                case 239:
-                case 244:
-                case 243:
-                case 250:
-                case 249:
-                case 192:
-                case 193:
-                case 149:
+                case 156 /* GetAccessor */:
+                case 157 /* SetAccessor */:
+                case 155 /* Constructor */:
+                case 152 /* PropertyDeclaration */:
+                case 151 /* PropertySignature */:
+                case 154 /* MethodDeclaration */:
+                case 153 /* MethodSignature */:
+                case 160 /* IndexSignature */:
+                case 239 /* ModuleDeclaration */:
+                case 244 /* ImportDeclaration */:
+                case 243 /* ImportEqualsDeclaration */:
+                case 250 /* ExportDeclaration */:
+                case 249 /* ExportAssignment */:
+                case 192 /* FunctionExpression */:
+                case 193 /* ArrowFunction */:
+                case 149 /* Parameter */:
                     return false;
                 default:
-                    if (node.parent.kind === 240 || node.parent.kind === 274) {
+                    if (node.parent.kind === 240 /* ModuleBlock */ || node.parent.kind === 274 /* SourceFile */) {
                         return false;
                     }
                     switch (node.kind) {
-                        case 234:
-                            return nodeHasAnyModifiersExcept(node, 120);
-                        case 235:
-                            return nodeHasAnyModifiersExcept(node, 117);
-                        case 236:
-                        case 214:
-                        case 237:
+                        case 234 /* FunctionDeclaration */:
+                            return nodeHasAnyModifiersExcept(node, 120 /* AsyncKeyword */);
+                        case 235 /* ClassDeclaration */:
+                            return nodeHasAnyModifiersExcept(node, 117 /* AbstractKeyword */);
+                        case 236 /* InterfaceDeclaration */:
+                        case 214 /* VariableStatement */:
+                        case 237 /* TypeAliasDeclaration */:
                             return true;
-                        case 238:
-                            return nodeHasAnyModifiersExcept(node, 76);
+                        case 238 /* EnumDeclaration */:
+                            return nodeHasAnyModifiersExcept(node, 76 /* ConstKeyword */);
                         default:
                             ts.Debug.fail();
                             return false;
@@ -44379,10 +54141,10 @@ var ts;
         }
         function checkGrammarAsyncModifier(node, asyncModifier) {
             switch (node.kind) {
-                case 154:
-                case 234:
-                case 192:
-                case 193:
+                case 154 /* MethodDeclaration */:
+                case 234 /* FunctionDeclaration */:
+                case 192 /* FunctionExpression */:
+                case 193 /* ArrowFunction */:
                     return false;
             }
             return grammarErrorOnNode(asyncModifier, ts.Diagnostics._0_modifier_cannot_be_used_here, "async");
@@ -44411,7 +54173,7 @@ var ts;
                     if (i !== (parameterCount - 1)) {
                         return grammarErrorOnNode(parameter.dotDotDotToken, ts.Diagnostics.A_rest_parameter_must_be_last_in_a_parameter_list);
                     }
-                    if (!(parameter.flags & 4194304)) {
+                    if (!(parameter.flags & 4194304 /* Ambient */)) { // Allow `...foo,` in ambient declarations; see GH#23070
                         checkGrammarForDisallowedTrailingComma(parameters, ts.Diagnostics.A_rest_parameter_or_binding_pattern_may_not_have_a_trailing_comma);
                     }
                     if (ts.isBindingPattern(parameter.name)) {
@@ -44436,6 +54198,7 @@ var ts;
             }
         }
         function checkGrammarFunctionLikeDeclaration(node) {
+            // Prevent cascading error by short-circuit
             var file = ts.getSourceFileOfNode(node);
             return checkGrammarDecoratorsAndModifiers(node) || checkGrammarTypeParameterList(node.typeParameters, file) ||
                 checkGrammarParameterList(node.parameters) || checkGrammarArrowFunction(node, file);
@@ -44478,12 +54241,12 @@ var ts;
             if (!parameter.type) {
                 return grammarErrorOnNode(parameter.name, ts.Diagnostics.An_index_signature_parameter_must_have_a_type_annotation);
             }
-            if (parameter.type.kind !== 137 && parameter.type.kind !== 134) {
+            if (parameter.type.kind !== 137 /* StringKeyword */ && parameter.type.kind !== 134 /* NumberKeyword */) {
                 var type = getTypeFromTypeNode(parameter.type);
-                if (type.flags & 4 || type.flags & 8) {
+                if (type.flags & 4 /* String */ || type.flags & 8 /* Number */) {
                     return grammarErrorOnNode(parameter.name, ts.Diagnostics.An_index_signature_parameter_type_cannot_be_a_type_alias_Consider_writing_0_Colon_1_Colon_2_instead, ts.getTextOfNode(parameter.name), typeToString(type), typeToString(getTypeFromTypeNode(node.type)));
                 }
-                if (type.flags & 262144 && allTypesAssignableToKind(type, 64, true)) {
+                if (type.flags & 262144 /* Union */ && allTypesAssignableToKind(type, 64 /* StringLiteral */, /*strict*/ true)) {
                     return grammarErrorOnNode(parameter.name, ts.Diagnostics.An_index_signature_parameter_type_cannot_be_a_union_type_Consider_using_a_mapped_object_type_instead);
                 }
                 return grammarErrorOnNode(parameter.name, ts.Diagnostics.An_index_signature_parameter_type_must_be_string_or_number);
@@ -44494,6 +54257,7 @@ var ts;
             return false;
         }
         function checkGrammarIndexSignature(node) {
+            // Prevent cascading error by short-circuit
             return checkGrammarDecoratorsAndModifiers(node) || checkGrammarIndexSignatureParameters(node);
         }
         function checkGrammarForAtLeastOneTypeArgument(node, typeArguments) {
@@ -44511,9 +54275,9 @@ var ts;
         }
         function checkGrammarForOmittedArgument(args) {
             if (args) {
-                for (var _i = 0, args_5 = args; _i < args_5.length; _i++) {
-                    var arg = args_5[_i];
-                    if (arg.kind === 206) {
+                for (var _i = 0, args_2 = args; _i < args_2.length; _i++) {
+                    var arg = args_2[_i];
+                    if (arg.kind === 206 /* OmittedExpression */) {
                         return grammarErrorAtPos(arg, arg.pos, 0, ts.Diagnostics.Argument_expression_expected);
                     }
                 }
@@ -44543,7 +54307,7 @@ var ts;
             if (!checkGrammarDecoratorsAndModifiers(node) && node.heritageClauses) {
                 for (var _i = 0, _a = node.heritageClauses; _i < _a.length; _i++) {
                     var heritageClause = _a[_i];
-                    if (heritageClause.token === 85) {
+                    if (heritageClause.token === 85 /* ExtendsKeyword */) {
                         if (seenExtendsClause) {
                             return grammarErrorOnFirstToken(heritageClause, ts.Diagnostics.extends_clause_already_seen);
                         }
@@ -44556,12 +54320,13 @@ var ts;
                         seenExtendsClause = true;
                     }
                     else {
-                        ts.Debug.assert(heritageClause.token === 108);
+                        ts.Debug.assert(heritageClause.token === 108 /* ImplementsKeyword */);
                         if (seenImplementsClause) {
                             return grammarErrorOnFirstToken(heritageClause, ts.Diagnostics.implements_clause_already_seen);
                         }
                         seenImplementsClause = true;
                     }
+                    // Grammar checking heritageClause inside class declaration
                     checkGrammarHeritageClause(heritageClause);
                 }
             }
@@ -44571,37 +54336,39 @@ var ts;
             if (node.heritageClauses) {
                 for (var _i = 0, _a = node.heritageClauses; _i < _a.length; _i++) {
                     var heritageClause = _a[_i];
-                    if (heritageClause.token === 85) {
+                    if (heritageClause.token === 85 /* ExtendsKeyword */) {
                         if (seenExtendsClause) {
                             return grammarErrorOnFirstToken(heritageClause, ts.Diagnostics.extends_clause_already_seen);
                         }
                         seenExtendsClause = true;
                     }
                     else {
-                        ts.Debug.assert(heritageClause.token === 108);
+                        ts.Debug.assert(heritageClause.token === 108 /* ImplementsKeyword */);
                         return grammarErrorOnFirstToken(heritageClause, ts.Diagnostics.Interface_declaration_cannot_have_implements_clause);
                     }
+                    // Grammar checking heritageClause inside class declaration
                     checkGrammarHeritageClause(heritageClause);
                 }
             }
             return false;
         }
         function checkGrammarComputedPropertyName(node) {
-            if (node.kind !== 147) {
+            // If node is not a computedPropertyName, just skip the grammar checking
+            if (node.kind !== 147 /* ComputedPropertyName */) {
                 return false;
             }
             var computedPropertyName = node;
-            if (computedPropertyName.expression.kind === 200 && computedPropertyName.expression.operatorToken.kind === 26) {
+            if (computedPropertyName.expression.kind === 200 /* BinaryExpression */ && computedPropertyName.expression.operatorToken.kind === 26 /* CommaToken */) {
                 return grammarErrorOnNode(computedPropertyName.expression, ts.Diagnostics.A_comma_expression_is_not_allowed_in_a_computed_property_name);
             }
             return false;
         }
         function checkGrammarForGenerator(node) {
             if (node.asteriskToken) {
-                ts.Debug.assert(node.kind === 234 ||
-                    node.kind === 192 ||
-                    node.kind === 154);
-                if (node.flags & 4194304) {
+                ts.Debug.assert(node.kind === 234 /* FunctionDeclaration */ ||
+                    node.kind === 192 /* FunctionExpression */ ||
+                    node.kind === 154 /* MethodDeclaration */);
+                if (node.flags & 4194304 /* Ambient */) {
                     return grammarErrorOnNode(node.asteriskToken, ts.Diagnostics.Generators_are_not_allowed_in_an_ambient_context);
                 }
                 if (!node.body) {
@@ -44623,40 +54390,54 @@ var ts;
             var seen = ts.createUnderscoreEscapedMap();
             for (var _i = 0, _a = node.properties; _i < _a.length; _i++) {
                 var prop = _a[_i];
-                if (prop.kind === 272) {
+                if (prop.kind === 272 /* SpreadAssignment */) {
                     continue;
                 }
                 var name = prop.name;
-                if (name.kind === 147) {
+                if (name.kind === 147 /* ComputedPropertyName */) {
+                    // If the name is not a ComputedPropertyName, the grammar checking will skip it
                     checkGrammarComputedPropertyName(name);
                 }
-                if (prop.kind === 271 && !inDestructuring && prop.objectAssignmentInitializer) {
+                if (prop.kind === 271 /* ShorthandPropertyAssignment */ && !inDestructuring && prop.objectAssignmentInitializer) {
+                    // having objectAssignmentInitializer is only valid in ObjectAssignmentPattern
+                    // outside of destructuring it is a syntax error
                     return grammarErrorOnNode(prop.equalsToken, ts.Diagnostics.can_only_be_used_in_an_object_literal_property_inside_a_destructuring_assignment);
                 }
+                // Modifiers are never allowed on properties except for 'async' on a method declaration
                 if (prop.modifiers) {
-                    for (var _b = 0, _c = prop.modifiers; _b < _c.length; _b++) {
+                    for (var _b = 0, _c = prop.modifiers; _b < _c.length; _b++) { // TODO: GH#19955
                         var mod = _c[_b];
-                        if (mod.kind !== 120 || prop.kind !== 154) {
+                        if (mod.kind !== 120 /* AsyncKeyword */ || prop.kind !== 154 /* MethodDeclaration */) {
                             grammarErrorOnNode(mod, ts.Diagnostics._0_modifier_cannot_be_used_here, ts.getTextOfNode(mod));
                         }
                     }
                 }
+                // ECMA-262 11.1.5 Object Initializer
+                // If previous is not undefined then throw a SyntaxError exception if any of the following conditions are true
+                // a.This production is contained in strict code and IsDataDescriptor(previous) is true and
+                // IsDataDescriptor(propId.descriptor) is true.
+                //    b.IsDataDescriptor(previous) is true and IsAccessorDescriptor(propId.descriptor) is true.
+                //    c.IsAccessorDescriptor(previous) is true and IsDataDescriptor(propId.descriptor) is true.
+                //    d.IsAccessorDescriptor(previous) is true and IsAccessorDescriptor(propId.descriptor) is true
+                // and either both previous and propId.descriptor have[[Get]] fields or both previous and propId.descriptor have[[Set]] fields
                 var currentKind = void 0;
                 switch (prop.kind) {
-                    case 270:
-                    case 271:
+                    case 270 /* PropertyAssignment */:
+                    case 271 /* ShorthandPropertyAssignment */:
+                        // Grammar checking for computedPropertyName and shorthandPropertyAssignment
                         checkGrammarForInvalidQuestionMark(prop.questionToken, ts.Diagnostics.An_object_member_cannot_be_declared_optional);
-                        if (name.kind === 8) {
+                        if (name.kind === 8 /* NumericLiteral */) {
                             checkGrammarNumericLiteral(name);
                         }
-                    case 154:
-                        currentKind = 1;
+                    // falls through
+                    case 154 /* MethodDeclaration */:
+                        currentKind = 1 /* Property */;
                         break;
-                    case 156:
-                        currentKind = 2;
+                    case 156 /* GetAccessor */:
+                        currentKind = 2 /* GetAccessor */;
                         break;
-                    case 157:
-                        currentKind = 4;
+                    case 157 /* SetAccessor */:
+                        currentKind = 4 /* SetAccessor */;
                         break;
                     default:
                         throw ts.Debug.assertNever(prop, "Unexpected syntax kind:" + prop.kind);
@@ -44670,11 +54451,11 @@ var ts;
                     seen.set(effectiveName, currentKind);
                 }
                 else {
-                    if (currentKind === 1 && existingKind === 1) {
+                    if (currentKind === 1 /* Property */ && existingKind === 1 /* Property */) {
                         grammarErrorOnNode(name, ts.Diagnostics.Duplicate_identifier_0, ts.getTextOfNode(name));
                     }
-                    else if ((currentKind & 6) && (existingKind & 6)) {
-                        if (existingKind !== 6 && currentKind !== existingKind) {
+                    else if ((currentKind & 6 /* GetOrSetAccessor */) && (existingKind & 6 /* GetOrSetAccessor */)) {
+                        if (existingKind !== 6 /* GetOrSetAccessor */ && currentKind !== existingKind) {
                             seen.set(effectiveName, currentKind | existingKind);
                         }
                         else {
@@ -44692,7 +54473,7 @@ var ts;
             var seen = ts.createUnderscoreEscapedMap();
             for (var _i = 0, _a = node.attributes.properties; _i < _a.length; _i++) {
                 var attr = _a[_i];
-                if (attr.kind === 264) {
+                if (attr.kind === 264 /* JsxSpreadAttribute */) {
                     continue;
                 }
                 var name = attr.name, initializer = attr.initializer;
@@ -44702,7 +54483,7 @@ var ts;
                 else {
                     return grammarErrorOnNode(name, ts.Diagnostics.JSX_elements_cannot_have_multiple_attributes_with_the_same_name);
                 }
-                if (initializer && initializer.kind === 265 && !initializer.expression) {
+                if (initializer && initializer.kind === 265 /* JsxExpression */ && !initializer.expression) {
                     return grammarErrorOnNode(initializer, ts.Diagnostics.JSX_attributes_must_only_be_assigned_a_non_empty_expression);
                 }
             }
@@ -44711,33 +54492,40 @@ var ts;
             if (checkGrammarStatementInAmbientContext(forInOrOfStatement)) {
                 return true;
             }
-            if (forInOrOfStatement.kind === 222 && forInOrOfStatement.awaitModifier) {
-                if ((forInOrOfStatement.flags & 16384) === 0) {
+            if (forInOrOfStatement.kind === 222 /* ForOfStatement */ && forInOrOfStatement.awaitModifier) {
+                if ((forInOrOfStatement.flags & 16384 /* AwaitContext */) === 0 /* None */) {
                     return grammarErrorOnNode(forInOrOfStatement.awaitModifier, ts.Diagnostics.A_for_await_of_statement_is_only_allowed_within_an_async_function_or_async_generator);
                 }
             }
-            if (forInOrOfStatement.initializer.kind === 233) {
+            if (forInOrOfStatement.initializer.kind === 233 /* VariableDeclarationList */) {
                 var variableList = forInOrOfStatement.initializer;
                 if (!checkGrammarVariableDeclarationList(variableList)) {
                     var declarations = variableList.declarations;
+                    // declarations.length can be zero if there is an error in variable declaration in for-of or for-in
+                    // See http://www.ecma-international.org/ecma-262/6.0/#sec-for-in-and-for-of-statements for details
+                    // For example:
+                    //      var let = 10;
+                    //      for (let of [1,2,3]) {} // this is invalid ES6 syntax
+                    //      for (let in [1,2,3]) {} // this is invalid ES6 syntax
+                    // We will then want to skip on grammar checking on variableList declaration
                     if (!declarations.length) {
                         return false;
                     }
                     if (declarations.length > 1) {
-                        var diagnostic = forInOrOfStatement.kind === 221
+                        var diagnostic = forInOrOfStatement.kind === 221 /* ForInStatement */
                             ? ts.Diagnostics.Only_a_single_variable_declaration_is_allowed_in_a_for_in_statement
                             : ts.Diagnostics.Only_a_single_variable_declaration_is_allowed_in_a_for_of_statement;
                         return grammarErrorOnFirstToken(variableList.declarations[1], diagnostic);
                     }
                     var firstDeclaration = declarations[0];
                     if (firstDeclaration.initializer) {
-                        var diagnostic = forInOrOfStatement.kind === 221
+                        var diagnostic = forInOrOfStatement.kind === 221 /* ForInStatement */
                             ? ts.Diagnostics.The_variable_declaration_of_a_for_in_statement_cannot_have_an_initializer
                             : ts.Diagnostics.The_variable_declaration_of_a_for_of_statement_cannot_have_an_initializer;
                         return grammarErrorOnNode(firstDeclaration.name, diagnostic);
                     }
                     if (firstDeclaration.type) {
-                        var diagnostic = forInOrOfStatement.kind === 221
+                        var diagnostic = forInOrOfStatement.kind === 221 /* ForInStatement */
                             ? ts.Diagnostics.The_left_hand_side_of_a_for_in_statement_cannot_use_a_type_annotation
                             : ts.Diagnostics.The_left_hand_side_of_a_for_of_statement_cannot_use_a_type_annotation;
                         return grammarErrorOnNode(firstDeclaration, diagnostic);
@@ -44748,27 +54536,27 @@ var ts;
         }
         function checkGrammarAccessor(accessor) {
             var kind = accessor.kind;
-            if (languageVersion < 1) {
+            if (languageVersion < 1 /* ES5 */) {
                 return grammarErrorOnNode(accessor.name, ts.Diagnostics.Accessors_are_only_available_when_targeting_ECMAScript_5_and_higher);
             }
-            else if (accessor.flags & 4194304) {
+            else if (accessor.flags & 4194304 /* Ambient */) {
                 return grammarErrorOnNode(accessor.name, ts.Diagnostics.An_accessor_cannot_be_declared_in_an_ambient_context);
             }
-            else if (accessor.body === undefined && !ts.hasModifier(accessor, 128)) {
+            else if (accessor.body === undefined && !ts.hasModifier(accessor, 128 /* Abstract */)) {
                 return grammarErrorAtPos(accessor, accessor.end - 1, ";".length, ts.Diagnostics._0_expected, "{");
             }
-            else if (accessor.body && ts.hasModifier(accessor, 128)) {
+            else if (accessor.body && ts.hasModifier(accessor, 128 /* Abstract */)) {
                 return grammarErrorOnNode(accessor, ts.Diagnostics.An_abstract_accessor_cannot_have_an_implementation);
             }
             else if (accessor.typeParameters) {
                 return grammarErrorOnNode(accessor.name, ts.Diagnostics.An_accessor_cannot_have_type_parameters);
             }
             else if (!doesAccessorHaveCorrectParameterCount(accessor)) {
-                return grammarErrorOnNode(accessor.name, kind === 156 ?
+                return grammarErrorOnNode(accessor.name, kind === 156 /* GetAccessor */ ?
                     ts.Diagnostics.A_get_accessor_cannot_have_parameters :
                     ts.Diagnostics.A_set_accessor_must_have_exactly_one_parameter);
             }
-            else if (kind === 157) {
+            else if (kind === 157 /* SetAccessor */) {
                 if (accessor.type) {
                     return grammarErrorOnNode(accessor.name, ts.Diagnostics.A_set_accessor_cannot_have_a_return_type_annotation);
                 }
@@ -44787,41 +54575,45 @@ var ts;
             }
             return false;
         }
+        /** Does the accessor have the right number of parameters?
+         * A get accessor has no parameters or a single `this` parameter.
+         * A set accessor has one parameter or a `this` parameter and one more parameter.
+         */
         function doesAccessorHaveCorrectParameterCount(accessor) {
-            return getAccessorThisParameter(accessor) || accessor.parameters.length === (accessor.kind === 156 ? 0 : 1);
+            return getAccessorThisParameter(accessor) || accessor.parameters.length === (accessor.kind === 156 /* GetAccessor */ ? 0 : 1);
         }
         function getAccessorThisParameter(accessor) {
-            if (accessor.parameters.length === (accessor.kind === 156 ? 1 : 2)) {
+            if (accessor.parameters.length === (accessor.kind === 156 /* GetAccessor */ ? 1 : 2)) {
                 return ts.getThisParameter(accessor);
             }
         }
         function checkGrammarTypeOperatorNode(node) {
-            if (node.operator === 141) {
-                if (node.type.kind !== 138) {
-                    return grammarErrorOnNode(node.type, ts.Diagnostics._0_expected, ts.tokenToString(138));
+            if (node.operator === 141 /* UniqueKeyword */) {
+                if (node.type.kind !== 138 /* SymbolKeyword */) {
+                    return grammarErrorOnNode(node.type, ts.Diagnostics._0_expected, ts.tokenToString(138 /* SymbolKeyword */));
                 }
                 var parent = ts.walkUpParenthesizedTypes(node.parent);
                 switch (parent.kind) {
-                    case 232:
+                    case 232 /* VariableDeclaration */:
                         var decl = parent;
-                        if (decl.name.kind !== 71) {
+                        if (decl.name.kind !== 71 /* Identifier */) {
                             return grammarErrorOnNode(node, ts.Diagnostics.unique_symbol_types_may_not_be_used_on_a_variable_declaration_with_a_binding_name);
                         }
                         if (!ts.isVariableDeclarationInVariableStatement(decl)) {
                             return grammarErrorOnNode(node, ts.Diagnostics.unique_symbol_types_are_only_allowed_on_variables_in_a_variable_statement);
                         }
-                        if (!(decl.parent.flags & 2)) {
+                        if (!(decl.parent.flags & 2 /* Const */)) {
                             return grammarErrorOnNode(parent.name, ts.Diagnostics.A_variable_whose_type_is_a_unique_symbol_type_must_be_const);
                         }
                         break;
-                    case 152:
-                        if (!ts.hasModifier(parent, 32) ||
-                            !ts.hasModifier(parent, 64)) {
+                    case 152 /* PropertyDeclaration */:
+                        if (!ts.hasModifier(parent, 32 /* Static */) ||
+                            !ts.hasModifier(parent, 64 /* Readonly */)) {
                             return grammarErrorOnNode(parent.name, ts.Diagnostics.A_property_of_a_class_whose_type_is_a_unique_symbol_type_must_be_both_static_and_readonly);
                         }
                         break;
-                    case 151:
-                        if (!ts.hasModifier(parent, 64)) {
+                    case 151 /* PropertySignature */:
+                        if (!ts.hasModifier(parent, 64 /* Readonly */)) {
                             return grammarErrorOnNode(parent.name, ts.Diagnostics.A_property_of_an_interface_or_type_literal_whose_type_is_a_unique_symbol_type_must_be_readonly);
                         }
                         break;
@@ -44839,9 +54631,10 @@ var ts;
             if (checkGrammarFunctionLikeDeclaration(node)) {
                 return true;
             }
-            if (node.kind === 154) {
-                if (node.parent.kind === 184) {
-                    if (node.modifiers && !(node.modifiers.length === 1 && ts.first(node.modifiers).kind === 120)) {
+            if (node.kind === 154 /* MethodDeclaration */) {
+                if (node.parent.kind === 184 /* ObjectLiteralExpression */) {
+                    // We only disallow modifier on a method declaration if it is a property of object-literal-expression
+                    if (node.modifiers && !(node.modifiers.length === 1 && ts.first(node.modifiers).kind === 120 /* AsyncKeyword */)) {
                         return grammarErrorOnFirstToken(node, ts.Diagnostics.Modifiers_cannot_appear_here);
                     }
                     else if (checkGrammarForInvalidQuestionMark(node.questionToken, ts.Diagnostics.An_object_member_cannot_be_declared_optional)) {
@@ -44856,17 +54649,22 @@ var ts;
                 }
             }
             if (ts.isClassLike(node.parent)) {
-                if (node.flags & 4194304) {
+                // Technically, computed properties in ambient contexts is disallowed
+                // for property declarations and accessors too, not just methods.
+                // However, property declarations disallow computed names in general,
+                // and accessors are not allowed in ambient contexts in general,
+                // so this error only really matters for methods.
+                if (node.flags & 4194304 /* Ambient */) {
                     return checkGrammarForInvalidDynamicName(node.name, ts.Diagnostics.A_computed_property_name_in_an_ambient_context_must_refer_to_an_expression_whose_type_is_a_literal_type_or_a_unique_symbol_type);
                 }
-                else if (node.kind === 154 && !node.body) {
+                else if (node.kind === 154 /* MethodDeclaration */ && !node.body) {
                     return checkGrammarForInvalidDynamicName(node.name, ts.Diagnostics.A_computed_property_name_in_a_method_overload_must_refer_to_an_expression_whose_type_is_a_literal_type_or_a_unique_symbol_type);
                 }
             }
-            else if (node.parent.kind === 236) {
+            else if (node.parent.kind === 236 /* InterfaceDeclaration */) {
                 return checkGrammarForInvalidDynamicName(node.name, ts.Diagnostics.A_computed_property_name_in_an_interface_must_refer_to_an_expression_whose_type_is_a_literal_type_or_a_unique_symbol_type);
             }
-            else if (node.parent.kind === 166) {
+            else if (node.parent.kind === 166 /* TypeLiteral */) {
                 return checkGrammarForInvalidDynamicName(node.name, ts.Diagnostics.A_computed_property_name_in_a_type_literal_must_refer_to_an_expression_whose_type_is_a_literal_type_or_a_unique_symbol_type);
             }
         }
@@ -44877,23 +54675,27 @@ var ts;
                     return grammarErrorOnNode(node, ts.Diagnostics.Jump_target_cannot_cross_function_boundary);
                 }
                 switch (current.kind) {
-                    case 228:
+                    case 228 /* LabeledStatement */:
                         if (node.label && current.label.escapedText === node.label.escapedText) {
-                            var isMisplacedContinueLabel = node.kind === 223
-                                && !ts.isIterationStatement(current.statement, true);
+                            // found matching label - verify that label usage is correct
+                            // continue can only target labels that are on iteration statements
+                            var isMisplacedContinueLabel = node.kind === 223 /* ContinueStatement */
+                                && !ts.isIterationStatement(current.statement, /*lookInLabeledStatement*/ true);
                             if (isMisplacedContinueLabel) {
                                 return grammarErrorOnNode(node, ts.Diagnostics.A_continue_statement_can_only_jump_to_a_label_of_an_enclosing_iteration_statement);
                             }
                             return false;
                         }
                         break;
-                    case 227:
-                        if (node.kind === 224 && !node.label) {
+                    case 227 /* SwitchStatement */:
+                        if (node.kind === 224 /* BreakStatement */ && !node.label) {
+                            // unlabeled break within switch statement - ok
                             return false;
                         }
                         break;
                     default:
-                        if (ts.isIterationStatement(current, false) && !node.label) {
+                        if (ts.isIterationStatement(current, /*lookInLabeledStatement*/ false) && !node.label) {
+                            // unlabeled break or continue within iteration statement - ok
                             return false;
                         }
                         break;
@@ -44901,13 +54703,13 @@ var ts;
                 current = current.parent;
             }
             if (node.label) {
-                var message = node.kind === 224
+                var message = node.kind === 224 /* BreakStatement */
                     ? ts.Diagnostics.A_break_statement_can_only_jump_to_a_label_of_an_enclosing_statement
                     : ts.Diagnostics.A_continue_statement_can_only_jump_to_a_label_of_an_enclosing_iteration_statement;
                 return grammarErrorOnNode(node, message);
             }
             else {
-                var message = node.kind === 224
+                var message = node.kind === 224 /* BreakStatement */
                     ? ts.Diagnostics.A_break_statement_can_only_be_used_within_an_enclosing_iteration_or_switch_statement
                     : ts.Diagnostics.A_continue_statement_can_only_be_used_within_an_enclosing_iteration_statement;
                 return grammarErrorOnNode(node, message);
@@ -44920,25 +54722,26 @@ var ts;
                     return grammarErrorOnNode(node, ts.Diagnostics.A_rest_element_must_be_last_in_a_destructuring_pattern);
                 }
                 checkGrammarForDisallowedTrailingComma(elements, ts.Diagnostics.A_rest_parameter_or_binding_pattern_may_not_have_a_trailing_comma);
-                if (node.name.kind === 181 || node.name.kind === 180) {
+                if (node.name.kind === 181 /* ArrayBindingPattern */ || node.name.kind === 180 /* ObjectBindingPattern */) {
                     return grammarErrorOnNode(node.name, ts.Diagnostics.A_rest_element_cannot_contain_a_binding_pattern);
                 }
                 if (node.propertyName) {
                     return grammarErrorOnNode(node.name, ts.Diagnostics.A_rest_element_cannot_have_a_property_name);
                 }
                 if (node.initializer) {
+                    // Error on equals token which immediately precedes the initializer
                     return grammarErrorAtPos(node, node.initializer.pos - 1, 1, ts.Diagnostics.A_rest_element_cannot_have_an_initializer);
                 }
             }
         }
         function isStringOrNumberLiteralExpression(expr) {
-            return expr.kind === 9 || expr.kind === 8 ||
-                expr.kind === 198 && expr.operator === 38 &&
-                    expr.operand.kind === 8;
+            return expr.kind === 9 /* StringLiteral */ || expr.kind === 8 /* NumericLiteral */ ||
+                expr.kind === 198 /* PrefixUnaryExpression */ && expr.operator === 38 /* MinusToken */ &&
+                    expr.operand.kind === 8 /* NumericLiteral */;
         }
         function checkGrammarVariableDeclaration(node) {
-            if (node.parent.parent.kind !== 221 && node.parent.parent.kind !== 222) {
-                if (node.flags & 4194304) {
+            if (node.parent.parent.kind !== 221 /* ForInStatement */ && node.parent.parent.kind !== 222 /* ForOfStatement */) {
+                if (node.flags & 4194304 /* Ambient */) {
                     if (node.initializer) {
                         if (ts.isConst(node) && !node.type) {
                             if (!isStringOrNumberLiteralExpression(node.initializer)) {
@@ -44946,11 +54749,13 @@ var ts;
                             }
                         }
                         else {
+                            // Error on equals token which immediate precedes the initializer
                             var equalsTokenLength = "=".length;
                             return grammarErrorAtPos(node, node.initializer.pos - equalsTokenLength, equalsTokenLength, ts.Diagnostics.Initializers_are_not_allowed_in_ambient_contexts);
                         }
                     }
                     if (node.initializer && !(ts.isConst(node) && isStringOrNumberLiteralExpression(node.initializer))) {
+                        // Error on equals token which immediate precedes the initializer
                         var equalsTokenLength = "=".length;
                         return grammarErrorAtPos(node, node.initializer.pos - equalsTokenLength, equalsTokenLength, ts.Diagnostics.Initializers_are_not_allowed_in_ambient_contexts);
                     }
@@ -44964,18 +54769,24 @@ var ts;
                     }
                 }
             }
-            if (node.exclamationToken && (node.parent.parent.kind !== 214 || !node.type || node.initializer || node.flags & 4194304)) {
+            if (node.exclamationToken && (node.parent.parent.kind !== 214 /* VariableStatement */ || !node.type || node.initializer || node.flags & 4194304 /* Ambient */)) {
                 return grammarErrorOnNode(node.exclamationToken, ts.Diagnostics.A_definite_assignment_assertion_is_not_permitted_in_this_context);
             }
             if (compilerOptions.module !== ts.ModuleKind.ES2015 && compilerOptions.module !== ts.ModuleKind.ESNext && compilerOptions.module !== ts.ModuleKind.System && !compilerOptions.noEmit &&
-                !(node.parent.parent.flags & 4194304) && ts.hasModifier(node.parent.parent, 1)) {
+                !(node.parent.parent.flags & 4194304 /* Ambient */) && ts.hasModifier(node.parent.parent, 1 /* Export */)) {
                 checkESModuleMarker(node.name);
             }
             var checkLetConstNames = (ts.isLet(node) || ts.isConst(node));
+            // 1. LexicalDeclaration : LetOrConst BindingList ;
+            // It is a Syntax Error if the BoundNames of BindingList contains "let".
+            // 2. ForDeclaration: ForDeclaration : LetOrConst ForBinding
+            // It is a Syntax Error if the BoundNames of ForDeclaration contains "let".
+            // It is a SyntaxError if a VariableDeclaration or VariableDeclarationNoIn occurs within strict code
+            // and its Identifier is eval or arguments
             return checkLetConstNames && checkGrammarNameInLetOrConstDeclarations(node.name);
         }
         function checkESModuleMarker(name) {
-            if (name.kind === 71) {
+            if (name.kind === 71 /* Identifier */) {
                 if (ts.idText(name) === "__esModule") {
                     return grammarErrorOnNode(name, ts.Diagnostics.Identifier_expected_esModule_is_reserved_as_an_exported_marker_when_transforming_ECMAScript_modules);
                 }
@@ -44992,8 +54803,8 @@ var ts;
             return false;
         }
         function checkGrammarNameInLetOrConstDeclarations(name) {
-            if (name.kind === 71) {
-                if (name.originalKeywordKind === 110) {
+            if (name.kind === 71 /* Identifier */) {
+                if (name.originalKeywordKind === 110 /* LetKeyword */) {
                     return grammarErrorOnNode(name, ts.Diagnostics.let_is_not_allowed_to_be_used_as_a_name_in_let_or_const_declarations);
                 }
             }
@@ -45020,15 +54831,15 @@ var ts;
         }
         function allowLetAndConstDeclarations(parent) {
             switch (parent.kind) {
-                case 217:
-                case 218:
-                case 219:
-                case 226:
-                case 220:
-                case 221:
-                case 222:
+                case 217 /* IfStatement */:
+                case 218 /* DoStatement */:
+                case 219 /* WhileStatement */:
+                case 226 /* WithStatement */:
+                case 220 /* ForStatement */:
+                case 221 /* ForInStatement */:
+                case 222 /* ForOfStatement */:
                     return false;
-                case 228:
+                case 228 /* LabeledStatement */:
                     return allowLetAndConstDeclarations(parent.parent);
             }
             return true;
@@ -45046,12 +54857,12 @@ var ts;
         function checkGrammarMetaProperty(node) {
             var escapedText = node.name.escapedText;
             switch (node.keywordToken) {
-                case 94:
+                case 94 /* NewKeyword */:
                     if (escapedText !== "target") {
                         return grammarErrorOnNode(node.name, ts.Diagnostics._0_is_not_a_valid_meta_property_for_keyword_1_Did_you_mean_2, node.name.escapedText, ts.tokenToString(node.keywordToken), "target");
                     }
                     break;
-                case 91:
+                case 91 /* ImportKeyword */:
                     if (escapedText !== "meta") {
                         return grammarErrorOnNode(node.name, ts.Diagnostics._0_is_not_a_valid_meta_property_for_keyword_1_Did_you_mean_2, node.name.escapedText, ts.tokenToString(node.keywordToken), "meta");
                     }
@@ -45105,7 +54916,7 @@ var ts;
                     return true;
                 }
             }
-            else if (node.parent.kind === 236) {
+            else if (node.parent.kind === 236 /* InterfaceDeclaration */) {
                 if (checkGrammarForInvalidDynamicName(node.name, ts.Diagnostics.A_computed_property_name_in_an_interface_must_refer_to_an_expression_whose_type_is_a_literal_type_or_a_unique_symbol_type)) {
                     return true;
                 }
@@ -45113,7 +54924,7 @@ var ts;
                     return grammarErrorOnNode(node.initializer, ts.Diagnostics.An_interface_property_cannot_have_an_initializer);
                 }
             }
-            else if (node.parent.kind === 166) {
+            else if (node.parent.kind === 166 /* TypeLiteral */) {
                 if (checkGrammarForInvalidDynamicName(node.name, ts.Diagnostics.A_computed_property_name_in_a_type_literal_must_refer_to_an_expression_whose_type_is_a_literal_type_or_a_unique_symbol_type)) {
                     return true;
                 }
@@ -45121,23 +54932,35 @@ var ts;
                     return grammarErrorOnNode(node.initializer, ts.Diagnostics.A_type_literal_property_cannot_have_an_initializer);
                 }
             }
-            if (node.flags & 4194304 && node.initializer) {
+            if (node.flags & 4194304 /* Ambient */ && node.initializer) {
                 return grammarErrorOnFirstToken(node.initializer, ts.Diagnostics.Initializers_are_not_allowed_in_ambient_contexts);
             }
             if (ts.isPropertyDeclaration(node) && node.exclamationToken && (!ts.isClassLike(node.parent) || !node.type || node.initializer ||
-                node.flags & 4194304 || ts.hasModifier(node, 32 | 128))) {
+                node.flags & 4194304 /* Ambient */ || ts.hasModifier(node, 32 /* Static */ | 128 /* Abstract */))) {
                 return grammarErrorOnNode(node.exclamationToken, ts.Diagnostics.A_definite_assignment_assertion_is_not_permitted_in_this_context);
             }
         }
         function checkGrammarTopLevelElementForRequiredDeclareModifier(node) {
-            if (node.kind === 236 ||
-                node.kind === 237 ||
-                node.kind === 244 ||
-                node.kind === 243 ||
-                node.kind === 250 ||
-                node.kind === 249 ||
-                node.kind === 242 ||
-                ts.hasModifier(node, 2 | 1 | 512)) {
+            // A declare modifier is required for any top level .d.ts declaration except export=, export default, export as namespace
+            // interfaces and imports categories:
+            //
+            //  DeclarationElement:
+            //     ExportAssignment
+            //     export_opt   InterfaceDeclaration
+            //     export_opt   TypeAliasDeclaration
+            //     export_opt   ImportDeclaration
+            //     export_opt   ExternalImportDeclaration
+            //     export_opt   AmbientDeclaration
+            //
+            // TODO: The spec needs to be amended to reflect this grammar.
+            if (node.kind === 236 /* InterfaceDeclaration */ ||
+                node.kind === 237 /* TypeAliasDeclaration */ ||
+                node.kind === 244 /* ImportDeclaration */ ||
+                node.kind === 243 /* ImportEqualsDeclaration */ ||
+                node.kind === 250 /* ExportDeclaration */ ||
+                node.kind === 249 /* ExportAssignment */ ||
+                node.kind === 242 /* NamespaceExportDeclaration */ ||
+                ts.hasModifier(node, 2 /* Ambient */ | 1 /* Export */ | 512 /* Default */)) {
                 return false;
             }
             return grammarErrorOnFirstToken(node, ts.Diagnostics.A_declare_modifier_is_required_for_a_top_level_declaration_in_a_d_ts_file);
@@ -45145,7 +54968,7 @@ var ts;
         function checkGrammarTopLevelElementsForRequiredDeclareModifier(file) {
             for (var _i = 0, _a = file.statements; _i < _a.length; _i++) {
                 var decl = _a[_i];
-                if (ts.isDeclaration(decl) || decl.kind === 214) {
+                if (ts.isDeclaration(decl) || decl.kind === 214 /* VariableStatement */) {
                     if (checkGrammarTopLevelElementForRequiredDeclareModifier(decl)) {
                         return true;
                     }
@@ -45154,42 +54977,54 @@ var ts;
             return false;
         }
         function checkGrammarSourceFile(node) {
-            return !!(node.flags & 4194304) && checkGrammarTopLevelElementsForRequiredDeclareModifier(node);
+            return !!(node.flags & 4194304 /* Ambient */) && checkGrammarTopLevelElementsForRequiredDeclareModifier(node);
         }
         function checkGrammarStatementInAmbientContext(node) {
-            if (node.flags & 4194304) {
+            if (node.flags & 4194304 /* Ambient */) {
+                // An accessors is already reported about the ambient context
                 if (ts.isAccessor(node.parent)) {
                     return getNodeLinks(node).hasReportedStatementInAmbientContext = true;
                 }
+                // Find containing block which is either Block, ModuleBlock, SourceFile
                 var links = getNodeLinks(node);
                 if (!links.hasReportedStatementInAmbientContext && ts.isFunctionLike(node.parent)) {
                     return getNodeLinks(node).hasReportedStatementInAmbientContext = grammarErrorOnFirstToken(node, ts.Diagnostics.An_implementation_cannot_be_declared_in_ambient_contexts);
                 }
-                if (node.parent.kind === 213 || node.parent.kind === 240 || node.parent.kind === 274) {
+                // We are either parented by another statement, or some sort of block.
+                // If we're in a block, we only want to really report an error once
+                // to prevent noisiness.  So use a bit on the block to indicate if
+                // this has already been reported, and don't report if it has.
+                //
+                if (node.parent.kind === 213 /* Block */ || node.parent.kind === 240 /* ModuleBlock */ || node.parent.kind === 274 /* SourceFile */) {
                     var links_1 = getNodeLinks(node.parent);
+                    // Check if the containing block ever report this error
                     if (!links_1.hasReportedStatementInAmbientContext) {
                         return links_1.hasReportedStatementInAmbientContext = grammarErrorOnFirstToken(node, ts.Diagnostics.Statements_are_not_allowed_in_ambient_contexts);
                     }
                 }
                 else {
+                    // We must be parented by a statement.  If so, there's no need
+                    // to report the error as our parent will have already done it.
+                    // Debug.assert(isStatement(node.parent));
                 }
             }
             return false;
         }
         function checkGrammarNumericLiteral(node) {
-            if (node.numericLiteralFlags & 32) {
+            // Grammar checking
+            if (node.numericLiteralFlags & 32 /* Octal */) {
                 var diagnosticMessage = void 0;
-                if (languageVersion >= 1) {
+                if (languageVersion >= 1 /* ES5 */) {
                     diagnosticMessage = ts.Diagnostics.Octal_literals_are_not_available_when_targeting_ECMAScript_5_and_higher_Use_the_syntax_0;
                 }
-                else if (ts.isChildOfNodeWithKind(node, 178)) {
+                else if (ts.isChildOfNodeWithKind(node, 178 /* LiteralType */)) {
                     diagnosticMessage = ts.Diagnostics.Octal_literal_types_must_use_ES2015_syntax_Use_the_syntax_0;
                 }
-                else if (ts.isChildOfNodeWithKind(node, 273)) {
+                else if (ts.isChildOfNodeWithKind(node, 273 /* EnumMember */)) {
                     diagnosticMessage = ts.Diagnostics.Octal_literals_are_not_allowed_in_enums_members_initializer_Use_the_syntax_0;
                 }
                 if (diagnosticMessage) {
-                    var withMinus = ts.isPrefixUnaryExpression(node.parent) && node.parent.operator === 38;
+                    var withMinus = ts.isPrefixUnaryExpression(node.parent) && node.parent.operator === 38 /* MinusToken */;
                     var literal = (withMinus ? "-" : "") + "0o" + node.text;
                     return grammarErrorOnNode(withMinus ? node.parent : node, diagnosticMessage, literal);
                 }
@@ -45200,7 +55035,7 @@ var ts;
             var sourceFile = ts.getSourceFileOfNode(node);
             if (!hasParseDiagnostics(sourceFile)) {
                 var span = ts.getSpanOfTokenAtPosition(sourceFile, node.pos);
-                diagnostics.add(ts.createFileDiagnostic(sourceFile, ts.textSpanEnd(span), 0, message, arg0, arg1, arg2));
+                diagnostics.add(ts.createFileDiagnostic(sourceFile, ts.textSpanEnd(span), /*length*/ 0, message, arg0, arg1, arg2));
                 return true;
             }
             return false;
@@ -45209,6 +55044,7 @@ var ts;
             if (!ambientModulesCache) {
                 ambientModulesCache = [];
                 globals.forEach(function (global, sym) {
+                    // No need to `unescapeLeadingUnderscores`, an escaped symbol is never an ambient module.
                     if (ambientModuleSymbolRegex.test(sym)) {
                         ambientModulesCache.push(global);
                     }
@@ -45227,6 +55063,8 @@ var ts;
             if (nodeArguments.length !== 1) {
                 return grammarErrorOnNode(node, ts.Diagnostics.Dynamic_import_must_have_one_specifier_as_an_argument);
             }
+            // see: parseArgumentOrArrayLiteralElement...we use this function which parse arguments of callExpression to parse specifier for dynamic import.
+            // parseArgumentOrArrayLiteralElement allows spread element to be in an argument list which is not allowed as specifier in dynamic import.
             if (ts.isSpreadElement(nodeArguments[0])) {
                 return grammarErrorOnNode(nodeArguments[0], ts.Diagnostics.Specifier_of_dynamic_import_cannot_be_spread_element);
             }
@@ -45234,10 +55072,11 @@ var ts;
         }
     }
     ts.createTypeChecker = createTypeChecker;
+    /** Like 'isDeclarationName', but returns true for LHS of `import { x as y }` or `export { x as y }`. */
     function isDeclarationNameOrImportPropertyName(name) {
         switch (name.parent.kind) {
-            case 248:
-            case 252:
+            case 248 /* ImportSpecifier */:
+            case 252 /* ExportSpecifier */:
                 return ts.isIdentifier(name);
             default:
                 return ts.isDeclarationName(name);
@@ -45245,36 +55084,40 @@ var ts;
     }
     function isSomeImportDeclaration(decl) {
         switch (decl.kind) {
-            case 245:
-            case 243:
-            case 246:
-            case 248:
+            case 245 /* ImportClause */: // For default import
+            case 243 /* ImportEqualsDeclaration */:
+            case 246 /* NamespaceImport */:
+            case 248 /* ImportSpecifier */: // For rename import `x as y`
                 return true;
-            case 71:
-                return decl.parent.kind === 248;
+            case 71 /* Identifier */:
+                // For regular import, `decl` is an Identifier under the ImportSpecifier.
+                return decl.parent.kind === 248 /* ImportSpecifier */;
             default:
                 return false;
         }
     }
     var JsxNames;
     (function (JsxNames) {
+        // tslint:disable variable-name
         JsxNames.JSX = "JSX";
         JsxNames.IntrinsicElements = "IntrinsicElements";
         JsxNames.ElementClass = "ElementClass";
-        JsxNames.ElementAttributesPropertyNameContainer = "ElementAttributesProperty";
+        JsxNames.ElementAttributesPropertyNameContainer = "ElementAttributesProperty"; // TODO: Deprecate and remove support
         JsxNames.ElementChildrenAttributeNameContainer = "ElementChildrenAttribute";
         JsxNames.Element = "Element";
         JsxNames.IntrinsicAttributes = "IntrinsicAttributes";
         JsxNames.IntrinsicClassAttributes = "IntrinsicClassAttributes";
+        // tslint:enable variable-name
     })(JsxNames || (JsxNames = {}));
 })(ts || (ts = {}));
 var ts;
 (function (ts) {
     function createSynthesizedNode(kind) {
         var node = ts.createNode(kind, -1, -1);
-        node.flags |= 8;
+        node.flags |= 8 /* Synthesized */;
         return node;
     }
+    /* @internal */
     function updateNode(updated, original) {
         if (updated !== original) {
             setOriginalNode(updated, original);
@@ -45284,6 +55127,9 @@ var ts;
         return updated;
     }
     ts.updateNode = updateNode;
+    /**
+     * Make `elements` into a `NodeArray<T>`. If `elements` is `undefined`, returns an empty `NodeArray<T>`.
+     */
     function createNodeArray(elements, hasTrailingComma) {
         if (!elements || elements === ts.emptyArray) {
             elements = [];
@@ -45298,7 +55144,14 @@ var ts;
         return array;
     }
     ts.createNodeArray = createNodeArray;
+    /**
+     * Creates a shallow, memberwise clone of a node with no source map location.
+     */
+    /* @internal */
     function getSynthesizedClone(node) {
+        // We don't use "clone" from core.ts here, as we need to preserve the prototype chain of
+        // the original node. We also need to exclude specific properties and only include own-
+        // properties (to skip members already defined on the shared prototype).
         if (node === undefined) {
             return node;
         }
@@ -45331,20 +55184,20 @@ var ts;
     }
     ts.createLiteral = createLiteral;
     function createNumericLiteral(value) {
-        var node = createSynthesizedNode(8);
+        var node = createSynthesizedNode(8 /* NumericLiteral */);
         node.text = value;
         node.numericLiteralFlags = 0;
         return node;
     }
     ts.createNumericLiteral = createNumericLiteral;
     function createStringLiteral(text) {
-        var node = createSynthesizedNode(9);
+        var node = createSynthesizedNode(9 /* StringLiteral */);
         node.text = text;
         return node;
     }
     ts.createStringLiteral = createStringLiteral;
     function createRegularExpressionLiteral(text) {
-        var node = createSynthesizedNode(12);
+        var node = createSynthesizedNode(12 /* RegularExpressionLiteral */);
         node.text = text;
         return node;
     }
@@ -45355,10 +55208,10 @@ var ts;
         return node;
     }
     function createIdentifier(text, typeArguments) {
-        var node = createSynthesizedNode(71);
+        var node = createSynthesizedNode(71 /* Identifier */);
         node.escapedText = ts.escapeLeadingUnderscores(text);
-        node.originalKeywordKind = text ? ts.stringToToken(text) : 0;
-        node.autoGenerateFlags = 0;
+        node.originalKeywordKind = text ? ts.stringToToken(text) : 0 /* Unknown */;
+        node.autoGenerateFlags = 0 /* None */;
         node.autoGenerateId = 0;
         if (typeArguments) {
             node.typeArguments = createNodeArray(typeArguments);
@@ -45375,29 +55228,31 @@ var ts;
     var nextAutoGenerateId = 0;
     function createTempVariable(recordTempVariable, reservedInNestedScopes) {
         var name = createIdentifier("");
-        name.autoGenerateFlags = 1;
+        name.autoGenerateFlags = 1 /* Auto */;
         name.autoGenerateId = nextAutoGenerateId;
         nextAutoGenerateId++;
         if (recordTempVariable) {
             recordTempVariable(name);
         }
         if (reservedInNestedScopes) {
-            name.autoGenerateFlags |= 8;
+            name.autoGenerateFlags |= 8 /* ReservedInNestedScopes */;
         }
         return name;
     }
     ts.createTempVariable = createTempVariable;
+    /** Create a unique temporary variable for use in a loop. */
     function createLoopVariable() {
         var name = createIdentifier("");
-        name.autoGenerateFlags = 2;
+        name.autoGenerateFlags = 2 /* Loop */;
         name.autoGenerateId = nextAutoGenerateId;
         nextAutoGenerateId++;
         return name;
     }
     ts.createLoopVariable = createLoopVariable;
+    /** Create a unique name based on the supplied text. */
     function createUniqueName(text) {
         var name = createIdentifier(text);
-        name.autoGenerateFlags = 3;
+        name.autoGenerateFlags = 3 /* Unique */;
         name.autoGenerateId = nextAutoGenerateId;
         nextAutoGenerateId++;
         return name;
@@ -45405,95 +55260,100 @@ var ts;
     ts.createUniqueName = createUniqueName;
     function createOptimisticUniqueName(text) {
         var name = createIdentifier(text);
-        name.autoGenerateFlags = 3 | 16;
+        name.autoGenerateFlags = 3 /* Unique */ | 16 /* Optimistic */;
         name.autoGenerateId = nextAutoGenerateId;
         nextAutoGenerateId++;
         return name;
     }
     ts.createOptimisticUniqueName = createOptimisticUniqueName;
+    /** Create a unique name based on the supplied text. This does not consider names injected by the transformer. */
     function createFileLevelUniqueName(text) {
         var name = createOptimisticUniqueName(text);
-        name.autoGenerateFlags |= 32;
+        name.autoGenerateFlags |= 32 /* FileLevel */;
         return name;
     }
     ts.createFileLevelUniqueName = createFileLevelUniqueName;
     function getGeneratedNameForNode(node, flags) {
         var name = createIdentifier(ts.isIdentifier(node) ? ts.idText(node) : "");
-        name.autoGenerateFlags = 4 | flags;
+        name.autoGenerateFlags = 4 /* Node */ | flags;
         name.autoGenerateId = nextAutoGenerateId;
         name.original = node;
         nextAutoGenerateId++;
         return name;
     }
     ts.getGeneratedNameForNode = getGeneratedNameForNode;
+    // Punctuation
     function createToken(token) {
         return createSynthesizedNode(token);
     }
     ts.createToken = createToken;
+    // Reserved words
     function createSuper() {
-        return createSynthesizedNode(97);
+        return createSynthesizedNode(97 /* SuperKeyword */);
     }
     ts.createSuper = createSuper;
     function createThis() {
-        return createSynthesizedNode(99);
+        return createSynthesizedNode(99 /* ThisKeyword */);
     }
     ts.createThis = createThis;
     function createNull() {
-        return createSynthesizedNode(95);
+        return createSynthesizedNode(95 /* NullKeyword */);
     }
     ts.createNull = createNull;
     function createTrue() {
-        return createSynthesizedNode(101);
+        return createSynthesizedNode(101 /* TrueKeyword */);
     }
     ts.createTrue = createTrue;
     function createFalse() {
-        return createSynthesizedNode(86);
+        return createSynthesizedNode(86 /* FalseKeyword */);
     }
     ts.createFalse = createFalse;
+    // Modifiers
     function createModifier(kind) {
         return createToken(kind);
     }
     ts.createModifier = createModifier;
     function createModifiersFromModifierFlags(flags) {
         var result = [];
-        if (flags & 1) {
-            result.push(createModifier(84));
+        if (flags & 1 /* Export */) {
+            result.push(createModifier(84 /* ExportKeyword */));
         }
-        if (flags & 2) {
-            result.push(createModifier(124));
+        if (flags & 2 /* Ambient */) {
+            result.push(createModifier(124 /* DeclareKeyword */));
         }
-        if (flags & 512) {
-            result.push(createModifier(79));
+        if (flags & 512 /* Default */) {
+            result.push(createModifier(79 /* DefaultKeyword */));
         }
-        if (flags & 2048) {
-            result.push(createModifier(76));
+        if (flags & 2048 /* Const */) {
+            result.push(createModifier(76 /* ConstKeyword */));
         }
-        if (flags & 4) {
-            result.push(createModifier(114));
+        if (flags & 4 /* Public */) {
+            result.push(createModifier(114 /* PublicKeyword */));
         }
-        if (flags & 8) {
-            result.push(createModifier(112));
+        if (flags & 8 /* Private */) {
+            result.push(createModifier(112 /* PrivateKeyword */));
         }
-        if (flags & 16) {
-            result.push(createModifier(113));
+        if (flags & 16 /* Protected */) {
+            result.push(createModifier(113 /* ProtectedKeyword */));
         }
-        if (flags & 128) {
-            result.push(createModifier(117));
+        if (flags & 128 /* Abstract */) {
+            result.push(createModifier(117 /* AbstractKeyword */));
         }
-        if (flags & 32) {
-            result.push(createModifier(115));
+        if (flags & 32 /* Static */) {
+            result.push(createModifier(115 /* StaticKeyword */));
         }
-        if (flags & 64) {
-            result.push(createModifier(132));
+        if (flags & 64 /* Readonly */) {
+            result.push(createModifier(132 /* ReadonlyKeyword */));
         }
-        if (flags & 256) {
-            result.push(createModifier(120));
+        if (flags & 256 /* Async */) {
+            result.push(createModifier(120 /* AsyncKeyword */));
         }
         return result;
     }
     ts.createModifiersFromModifierFlags = createModifiersFromModifierFlags;
+    // Names
     function createQualifiedName(left, right) {
-        var node = createSynthesizedNode(146);
+        var node = createSynthesizedNode(146 /* QualifiedName */);
         node.left = left;
         node.right = asName(right);
         return node;
@@ -45507,13 +55367,13 @@ var ts;
     }
     ts.updateQualifiedName = updateQualifiedName;
     function parenthesizeForComputedName(expression) {
-        return (ts.isBinaryExpression(expression) && expression.operatorToken.kind === 26) ||
-            expression.kind === 302 ?
+        return (ts.isBinaryExpression(expression) && expression.operatorToken.kind === 26 /* CommaToken */) ||
+            expression.kind === 302 /* CommaListExpression */ ?
             createParen(expression) :
             expression;
     }
     function createComputedPropertyName(expression) {
-        var node = createSynthesizedNode(147);
+        var node = createSynthesizedNode(147 /* ComputedPropertyName */);
         node.expression = parenthesizeForComputedName(expression);
         return node;
     }
@@ -45524,8 +55384,9 @@ var ts;
             : node;
     }
     ts.updateComputedPropertyName = updateComputedPropertyName;
+    // Signature elements
     function createTypeParameterDeclaration(name, constraint, defaultType) {
-        var node = createSynthesizedNode(148);
+        var node = createSynthesizedNode(148 /* TypeParameter */);
         node.name = asName(name);
         node.constraint = constraint;
         node.default = defaultType;
@@ -45541,7 +55402,7 @@ var ts;
     }
     ts.updateTypeParameterDeclaration = updateTypeParameterDeclaration;
     function createParameter(decorators, modifiers, dotDotDotToken, name, questionToken, type, initializer) {
-        var node = createSynthesizedNode(149);
+        var node = createSynthesizedNode(149 /* Parameter */);
         node.decorators = asNodeArray(decorators);
         node.modifiers = asNodeArray(modifiers);
         node.dotDotDotToken = dotDotDotToken;
@@ -45565,7 +55426,7 @@ var ts;
     }
     ts.updateParameter = updateParameter;
     function createDecorator(expression) {
-        var node = createSynthesizedNode(150);
+        var node = createSynthesizedNode(150 /* Decorator */);
         node.expression = ts.parenthesizeForAccess(expression);
         return node;
     }
@@ -45576,8 +55437,9 @@ var ts;
             : node;
     }
     ts.updateDecorator = updateDecorator;
+    // Type Elements
     function createPropertySignature(modifiers, name, questionToken, type, initializer) {
-        var node = createSynthesizedNode(151);
+        var node = createSynthesizedNode(151 /* PropertySignature */);
         node.modifiers = asNodeArray(modifiers);
         node.name = asName(name);
         node.questionToken = questionToken;
@@ -45597,12 +55459,12 @@ var ts;
     }
     ts.updatePropertySignature = updatePropertySignature;
     function createProperty(decorators, modifiers, name, questionOrExclamationToken, type, initializer) {
-        var node = createSynthesizedNode(152);
+        var node = createSynthesizedNode(152 /* PropertyDeclaration */);
         node.decorators = asNodeArray(decorators);
         node.modifiers = asNodeArray(modifiers);
         node.name = asName(name);
-        node.questionToken = questionOrExclamationToken !== undefined && questionOrExclamationToken.kind === 55 ? questionOrExclamationToken : undefined;
-        node.exclamationToken = questionOrExclamationToken !== undefined && questionOrExclamationToken.kind === 51 ? questionOrExclamationToken : undefined;
+        node.questionToken = questionOrExclamationToken !== undefined && questionOrExclamationToken.kind === 55 /* QuestionToken */ ? questionOrExclamationToken : undefined;
+        node.exclamationToken = questionOrExclamationToken !== undefined && questionOrExclamationToken.kind === 51 /* ExclamationToken */ ? questionOrExclamationToken : undefined;
         node.type = type;
         node.initializer = initializer;
         return node;
@@ -45612,8 +55474,8 @@ var ts;
         return node.decorators !== decorators
             || node.modifiers !== modifiers
             || node.name !== name
-            || node.questionToken !== (questionOrExclamationToken !== undefined && questionOrExclamationToken.kind === 55 ? questionOrExclamationToken : undefined)
-            || node.exclamationToken !== (questionOrExclamationToken !== undefined && questionOrExclamationToken.kind === 51 ? questionOrExclamationToken : undefined)
+            || node.questionToken !== (questionOrExclamationToken !== undefined && questionOrExclamationToken.kind === 55 /* QuestionToken */ ? questionOrExclamationToken : undefined)
+            || node.exclamationToken !== (questionOrExclamationToken !== undefined && questionOrExclamationToken.kind === 51 /* ExclamationToken */ ? questionOrExclamationToken : undefined)
             || node.type !== type
             || node.initializer !== initializer
             ? updateNode(createProperty(decorators, modifiers, name, questionOrExclamationToken, type, initializer), node)
@@ -45621,7 +55483,7 @@ var ts;
     }
     ts.updateProperty = updateProperty;
     function createMethodSignature(typeParameters, parameters, type, name, questionToken) {
-        var node = createSignatureDeclaration(153, typeParameters, parameters, type);
+        var node = createSignatureDeclaration(153 /* MethodSignature */, typeParameters, parameters, type);
         node.name = asName(name);
         node.questionToken = questionToken;
         return node;
@@ -45638,7 +55500,7 @@ var ts;
     }
     ts.updateMethodSignature = updateMethodSignature;
     function createMethod(decorators, modifiers, asteriskToken, name, questionToken, typeParameters, parameters, type, body) {
-        var node = createSynthesizedNode(154);
+        var node = createSynthesizedNode(154 /* MethodDeclaration */);
         node.decorators = asNodeArray(decorators);
         node.modifiers = asNodeArray(modifiers);
         node.asteriskToken = asteriskToken;
@@ -45666,7 +55528,7 @@ var ts;
     }
     ts.updateMethod = updateMethod;
     function createConstructor(decorators, modifiers, parameters, body) {
-        var node = createSynthesizedNode(155);
+        var node = createSynthesizedNode(155 /* Constructor */);
         node.decorators = asNodeArray(decorators);
         node.modifiers = asNodeArray(modifiers);
         node.typeParameters = undefined;
@@ -45686,7 +55548,7 @@ var ts;
     }
     ts.updateConstructor = updateConstructor;
     function createGetAccessor(decorators, modifiers, name, parameters, type, body) {
-        var node = createSynthesizedNode(156);
+        var node = createSynthesizedNode(156 /* GetAccessor */);
         node.decorators = asNodeArray(decorators);
         node.modifiers = asNodeArray(modifiers);
         node.name = asName(name);
@@ -45709,7 +55571,7 @@ var ts;
     }
     ts.updateGetAccessor = updateGetAccessor;
     function createSetAccessor(decorators, modifiers, name, parameters, body) {
-        var node = createSynthesizedNode(157);
+        var node = createSynthesizedNode(157 /* SetAccessor */);
         node.decorators = asNodeArray(decorators);
         node.modifiers = asNodeArray(modifiers);
         node.name = asName(name);
@@ -45730,7 +55592,7 @@ var ts;
     }
     ts.updateSetAccessor = updateSetAccessor;
     function createCallSignature(typeParameters, parameters, type) {
-        return createSignatureDeclaration(158, typeParameters, parameters, type);
+        return createSignatureDeclaration(158 /* CallSignature */, typeParameters, parameters, type);
     }
     ts.createCallSignature = createCallSignature;
     function updateCallSignature(node, typeParameters, parameters, type) {
@@ -45738,7 +55600,7 @@ var ts;
     }
     ts.updateCallSignature = updateCallSignature;
     function createConstructSignature(typeParameters, parameters, type) {
-        return createSignatureDeclaration(159, typeParameters, parameters, type);
+        return createSignatureDeclaration(159 /* ConstructSignature */, typeParameters, parameters, type);
     }
     ts.createConstructSignature = createConstructSignature;
     function updateConstructSignature(node, typeParameters, parameters, type) {
@@ -45746,7 +55608,7 @@ var ts;
     }
     ts.updateConstructSignature = updateConstructSignature;
     function createIndexSignature(decorators, modifiers, parameters, type) {
-        var node = createSynthesizedNode(160);
+        var node = createSynthesizedNode(160 /* IndexSignature */);
         node.decorators = asNodeArray(decorators);
         node.modifiers = asNodeArray(modifiers);
         node.parameters = createNodeArray(parameters);
@@ -45763,6 +55625,7 @@ var ts;
             : node;
     }
     ts.updateIndexSignature = updateIndexSignature;
+    /* @internal */
     function createSignatureDeclaration(kind, typeParameters, parameters, type, typeArguments) {
         var node = createSynthesizedNode(kind);
         node.typeParameters = asNodeArray(typeParameters);
@@ -45779,12 +55642,13 @@ var ts;
             ? updateNode(createSignatureDeclaration(node.kind, typeParameters, parameters, type), node)
             : node;
     }
+    // Types
     function createKeywordTypeNode(kind) {
         return createSynthesizedNode(kind);
     }
     ts.createKeywordTypeNode = createKeywordTypeNode;
     function createTypePredicateNode(parameterName, type) {
-        var node = createSynthesizedNode(161);
+        var node = createSynthesizedNode(161 /* TypePredicate */);
         node.parameterName = asName(parameterName);
         node.type = type;
         return node;
@@ -45798,7 +55662,7 @@ var ts;
     }
     ts.updateTypePredicateNode = updateTypePredicateNode;
     function createTypeReferenceNode(typeName, typeArguments) {
-        var node = createSynthesizedNode(162);
+        var node = createSynthesizedNode(162 /* TypeReference */);
         node.typeName = asName(typeName);
         node.typeArguments = typeArguments && ts.parenthesizeTypeParameters(typeArguments);
         return node;
@@ -45812,7 +55676,7 @@ var ts;
     }
     ts.updateTypeReferenceNode = updateTypeReferenceNode;
     function createFunctionTypeNode(typeParameters, parameters, type) {
-        return createSignatureDeclaration(163, typeParameters, parameters, type);
+        return createSignatureDeclaration(163 /* FunctionType */, typeParameters, parameters, type);
     }
     ts.createFunctionTypeNode = createFunctionTypeNode;
     function updateFunctionTypeNode(node, typeParameters, parameters, type) {
@@ -45820,7 +55684,7 @@ var ts;
     }
     ts.updateFunctionTypeNode = updateFunctionTypeNode;
     function createConstructorTypeNode(typeParameters, parameters, type) {
-        return createSignatureDeclaration(164, typeParameters, parameters, type);
+        return createSignatureDeclaration(164 /* ConstructorType */, typeParameters, parameters, type);
     }
     ts.createConstructorTypeNode = createConstructorTypeNode;
     function updateConstructorTypeNode(node, typeParameters, parameters, type) {
@@ -45828,7 +55692,7 @@ var ts;
     }
     ts.updateConstructorTypeNode = updateConstructorTypeNode;
     function createTypeQueryNode(exprName) {
-        var node = createSynthesizedNode(165);
+        var node = createSynthesizedNode(165 /* TypeQuery */);
         node.exprName = exprName;
         return node;
     }
@@ -45840,7 +55704,7 @@ var ts;
     }
     ts.updateTypeQueryNode = updateTypeQueryNode;
     function createTypeLiteralNode(members) {
-        var node = createSynthesizedNode(166);
+        var node = createSynthesizedNode(166 /* TypeLiteral */);
         node.members = createNodeArray(members);
         return node;
     }
@@ -45852,7 +55716,7 @@ var ts;
     }
     ts.updateTypeLiteralNode = updateTypeLiteralNode;
     function createArrayTypeNode(elementType) {
-        var node = createSynthesizedNode(167);
+        var node = createSynthesizedNode(167 /* ArrayType */);
         node.elementType = ts.parenthesizeArrayTypeMember(elementType);
         return node;
     }
@@ -45864,7 +55728,7 @@ var ts;
     }
     ts.updateArrayTypeNode = updateArrayTypeNode;
     function createTupleTypeNode(elementTypes) {
-        var node = createSynthesizedNode(168);
+        var node = createSynthesizedNode(168 /* TupleType */);
         node.elementTypes = createNodeArray(elementTypes);
         return node;
     }
@@ -45876,7 +55740,7 @@ var ts;
     }
     ts.updateTypleTypeNode = updateTypleTypeNode;
     function createUnionTypeNode(types) {
-        return createUnionOrIntersectionTypeNode(169, types);
+        return createUnionOrIntersectionTypeNode(169 /* UnionType */, types);
     }
     ts.createUnionTypeNode = createUnionTypeNode;
     function updateUnionTypeNode(node, types) {
@@ -45884,7 +55748,7 @@ var ts;
     }
     ts.updateUnionTypeNode = updateUnionTypeNode;
     function createIntersectionTypeNode(types) {
-        return createUnionOrIntersectionTypeNode(170, types);
+        return createUnionOrIntersectionTypeNode(170 /* IntersectionType */, types);
     }
     ts.createIntersectionTypeNode = createIntersectionTypeNode;
     function updateIntersectionTypeNode(node, types) {
@@ -45903,7 +55767,7 @@ var ts;
             : node;
     }
     function createConditionalTypeNode(checkType, extendsType, trueType, falseType) {
-        var node = createSynthesizedNode(171);
+        var node = createSynthesizedNode(171 /* ConditionalType */);
         node.checkType = ts.parenthesizeConditionalTypeMember(checkType);
         node.extendsType = ts.parenthesizeConditionalTypeMember(extendsType);
         node.trueType = trueType;
@@ -45921,7 +55785,7 @@ var ts;
     }
     ts.updateConditionalTypeNode = updateConditionalTypeNode;
     function createInferTypeNode(typeParameter) {
-        var node = createSynthesizedNode(172);
+        var node = createSynthesizedNode(172 /* InferType */);
         node.typeParameter = typeParameter;
         return node;
     }
@@ -45933,7 +55797,7 @@ var ts;
     }
     ts.updateInferTypeNode = updateInferTypeNode;
     function createImportTypeNode(argument, qualifier, typeArguments, isTypeOf) {
-        var node = createSynthesizedNode(179);
+        var node = createSynthesizedNode(179 /* ImportType */);
         node.argument = argument;
         node.qualifier = qualifier;
         node.typeArguments = asNodeArray(typeArguments);
@@ -45951,7 +55815,7 @@ var ts;
     }
     ts.updateImportTypeNode = updateImportTypeNode;
     function createParenthesizedType(type) {
-        var node = createSynthesizedNode(173);
+        var node = createSynthesizedNode(173 /* ParenthesizedType */);
         node.type = type;
         return node;
     }
@@ -45963,12 +55827,12 @@ var ts;
     }
     ts.updateParenthesizedType = updateParenthesizedType;
     function createThisTypeNode() {
-        return createSynthesizedNode(174);
+        return createSynthesizedNode(174 /* ThisType */);
     }
     ts.createThisTypeNode = createThisTypeNode;
     function createTypeOperatorNode(operatorOrType, type) {
-        var node = createSynthesizedNode(175);
-        node.operator = typeof operatorOrType === "number" ? operatorOrType : 128;
+        var node = createSynthesizedNode(175 /* TypeOperator */);
+        node.operator = typeof operatorOrType === "number" ? operatorOrType : 128 /* KeyOfKeyword */;
         node.type = ts.parenthesizeElementTypeMember(typeof operatorOrType === "number" ? type : operatorOrType);
         return node;
     }
@@ -45978,7 +55842,7 @@ var ts;
     }
     ts.updateTypeOperatorNode = updateTypeOperatorNode;
     function createIndexedAccessTypeNode(objectType, indexType) {
-        var node = createSynthesizedNode(176);
+        var node = createSynthesizedNode(176 /* IndexedAccessType */);
         node.objectType = ts.parenthesizeElementTypeMember(objectType);
         node.indexType = indexType;
         return node;
@@ -45992,7 +55856,7 @@ var ts;
     }
     ts.updateIndexedAccessTypeNode = updateIndexedAccessTypeNode;
     function createMappedTypeNode(readonlyToken, typeParameter, questionToken, type) {
-        var node = createSynthesizedNode(177);
+        var node = createSynthesizedNode(177 /* MappedType */);
         node.readonlyToken = readonlyToken;
         node.typeParameter = typeParameter;
         node.questionToken = questionToken;
@@ -46010,7 +55874,7 @@ var ts;
     }
     ts.updateMappedTypeNode = updateMappedTypeNode;
     function createLiteralTypeNode(literal) {
-        var node = createSynthesizedNode(178);
+        var node = createSynthesizedNode(178 /* LiteralType */);
         node.literal = literal;
         return node;
     }
@@ -46021,8 +55885,9 @@ var ts;
             : node;
     }
     ts.updateLiteralTypeNode = updateLiteralTypeNode;
+    // Binding Patterns
     function createObjectBindingPattern(elements) {
-        var node = createSynthesizedNode(180);
+        var node = createSynthesizedNode(180 /* ObjectBindingPattern */);
         node.elements = createNodeArray(elements);
         return node;
     }
@@ -46034,7 +55899,7 @@ var ts;
     }
     ts.updateObjectBindingPattern = updateObjectBindingPattern;
     function createArrayBindingPattern(elements) {
-        var node = createSynthesizedNode(181);
+        var node = createSynthesizedNode(181 /* ArrayBindingPattern */);
         node.elements = createNodeArray(elements);
         return node;
     }
@@ -46046,7 +55911,7 @@ var ts;
     }
     ts.updateArrayBindingPattern = updateArrayBindingPattern;
     function createBindingElement(dotDotDotToken, propertyName, name, initializer) {
-        var node = createSynthesizedNode(182);
+        var node = createSynthesizedNode(182 /* BindingElement */);
         node.dotDotDotToken = dotDotDotToken;
         node.propertyName = asName(propertyName);
         node.name = asName(name);
@@ -46063,8 +55928,9 @@ var ts;
             : node;
     }
     ts.updateBindingElement = updateBindingElement;
+    // Expression
     function createArrayLiteral(elements, multiLine) {
-        var node = createSynthesizedNode(183);
+        var node = createSynthesizedNode(183 /* ArrayLiteralExpression */);
         node.elements = ts.parenthesizeListElements(createNodeArray(elements));
         if (multiLine)
             node.multiLine = true;
@@ -46078,7 +55944,7 @@ var ts;
     }
     ts.updateArrayLiteral = updateArrayLiteral;
     function createObjectLiteral(properties, multiLine) {
-        var node = createSynthesizedNode(184);
+        var node = createSynthesizedNode(184 /* ObjectLiteralExpression */);
         node.properties = createNodeArray(properties);
         if (multiLine)
             node.multiLine = true;
@@ -46092,14 +55958,16 @@ var ts;
     }
     ts.updateObjectLiteral = updateObjectLiteral;
     function createPropertyAccess(expression, name) {
-        var node = createSynthesizedNode(185);
+        var node = createSynthesizedNode(185 /* PropertyAccessExpression */);
         node.expression = ts.parenthesizeForAccess(expression);
-        node.name = asName(name);
-        setEmitFlags(node, 131072);
+        node.name = asName(name); // TODO: GH#18217
+        setEmitFlags(node, 131072 /* NoIndentation */);
         return node;
     }
     ts.createPropertyAccess = createPropertyAccess;
     function updatePropertyAccess(node, expression, name) {
+        // Because we are updating existed propertyAccess we want to inherit its emitFlags
+        // instead of using the default from createPropertyAccess
         return node.expression !== expression
             || node.name !== name
             ? updateNode(setEmitFlags(createPropertyAccess(expression, name), ts.getEmitFlags(node)), node)
@@ -46107,7 +55975,7 @@ var ts;
     }
     ts.updatePropertyAccess = updatePropertyAccess;
     function createElementAccess(expression, index) {
-        var node = createSynthesizedNode(186);
+        var node = createSynthesizedNode(186 /* ElementAccessExpression */);
         node.expression = ts.parenthesizeForAccess(expression);
         node.argumentExpression = asExpression(index);
         return node;
@@ -46121,7 +55989,7 @@ var ts;
     }
     ts.updateElementAccess = updateElementAccess;
     function createCall(expression, typeArguments, argumentsArray) {
-        var node = createSynthesizedNode(187);
+        var node = createSynthesizedNode(187 /* CallExpression */);
         node.expression = ts.parenthesizeForAccess(expression);
         node.typeArguments = asNodeArray(typeArguments);
         node.arguments = ts.parenthesizeListElements(createNodeArray(argumentsArray));
@@ -46137,7 +56005,7 @@ var ts;
     }
     ts.updateCall = updateCall;
     function createNew(expression, typeArguments, argumentsArray) {
-        var node = createSynthesizedNode(188);
+        var node = createSynthesizedNode(188 /* NewExpression */);
         node.expression = ts.parenthesizeForNew(expression);
         node.typeArguments = asNodeArray(typeArguments);
         node.arguments = argumentsArray ? ts.parenthesizeListElements(createNodeArray(argumentsArray)) : undefined;
@@ -46153,7 +56021,7 @@ var ts;
     }
     ts.updateNew = updateNew;
     function createTaggedTemplate(tag, typeArgumentsOrTemplate, template) {
-        var node = createSynthesizedNode(189);
+        var node = createSynthesizedNode(189 /* TaggedTemplateExpression */);
         node.tag = ts.parenthesizeForAccess(tag);
         if (template) {
             node.typeArguments = asNodeArray(typeArgumentsOrTemplate);
@@ -46176,7 +56044,7 @@ var ts;
     }
     ts.updateTaggedTemplate = updateTaggedTemplate;
     function createTypeAssertion(type, expression) {
-        var node = createSynthesizedNode(190);
+        var node = createSynthesizedNode(190 /* TypeAssertionExpression */);
         node.type = type;
         node.expression = ts.parenthesizePrefixOperand(expression);
         return node;
@@ -46190,7 +56058,7 @@ var ts;
     }
     ts.updateTypeAssertion = updateTypeAssertion;
     function createParen(expression) {
-        var node = createSynthesizedNode(191);
+        var node = createSynthesizedNode(191 /* ParenthesizedExpression */);
         node.expression = expression;
         return node;
     }
@@ -46202,7 +56070,7 @@ var ts;
     }
     ts.updateParen = updateParen;
     function createFunctionExpression(modifiers, asteriskToken, name, typeParameters, parameters, type, body) {
-        var node = createSynthesizedNode(192);
+        var node = createSynthesizedNode(192 /* FunctionExpression */);
         node.modifiers = asNodeArray(modifiers);
         node.asteriskToken = asteriskToken;
         node.name = asName(name);
@@ -46226,12 +56094,12 @@ var ts;
     }
     ts.updateFunctionExpression = updateFunctionExpression;
     function createArrowFunction(modifiers, typeParameters, parameters, type, equalsGreaterThanToken, body) {
-        var node = createSynthesizedNode(193);
+        var node = createSynthesizedNode(193 /* ArrowFunction */);
         node.modifiers = asNodeArray(modifiers);
         node.typeParameters = asNodeArray(typeParameters);
         node.parameters = createNodeArray(parameters);
         node.type = type;
-        node.equalsGreaterThanToken = equalsGreaterThanToken || createToken(36);
+        node.equalsGreaterThanToken = equalsGreaterThanToken || createToken(36 /* EqualsGreaterThanToken */);
         node.body = ts.parenthesizeConciseBody(body);
         return node;
     }
@@ -46245,7 +56113,7 @@ var ts;
         }
         else {
             equalsGreaterThanToken = ts.cast(equalsGreaterThanTokenOrBody, function (n) {
-                return n.kind === 36;
+                return n.kind === 36 /* EqualsGreaterThanToken */;
             });
             body = bodyOrUndefined;
         }
@@ -46260,7 +56128,7 @@ var ts;
     }
     ts.updateArrowFunction = updateArrowFunction;
     function createDelete(expression) {
-        var node = createSynthesizedNode(194);
+        var node = createSynthesizedNode(194 /* DeleteExpression */);
         node.expression = ts.parenthesizePrefixOperand(expression);
         return node;
     }
@@ -46272,7 +56140,7 @@ var ts;
     }
     ts.updateDelete = updateDelete;
     function createTypeOf(expression) {
-        var node = createSynthesizedNode(195);
+        var node = createSynthesizedNode(195 /* TypeOfExpression */);
         node.expression = ts.parenthesizePrefixOperand(expression);
         return node;
     }
@@ -46284,7 +56152,7 @@ var ts;
     }
     ts.updateTypeOf = updateTypeOf;
     function createVoid(expression) {
-        var node = createSynthesizedNode(196);
+        var node = createSynthesizedNode(196 /* VoidExpression */);
         node.expression = ts.parenthesizePrefixOperand(expression);
         return node;
     }
@@ -46296,7 +56164,7 @@ var ts;
     }
     ts.updateVoid = updateVoid;
     function createAwait(expression) {
-        var node = createSynthesizedNode(197);
+        var node = createSynthesizedNode(197 /* AwaitExpression */);
         node.expression = ts.parenthesizePrefixOperand(expression);
         return node;
     }
@@ -46308,7 +56176,7 @@ var ts;
     }
     ts.updateAwait = updateAwait;
     function createPrefix(operator, operand) {
-        var node = createSynthesizedNode(198);
+        var node = createSynthesizedNode(198 /* PrefixUnaryExpression */);
         node.operator = operator;
         node.operand = ts.parenthesizePrefixOperand(operand);
         return node;
@@ -46321,7 +56189,7 @@ var ts;
     }
     ts.updatePrefix = updatePrefix;
     function createPostfix(operand, operator) {
-        var node = createSynthesizedNode(199);
+        var node = createSynthesizedNode(199 /* PostfixUnaryExpression */);
         node.operand = ts.parenthesizePostfixOperand(operand);
         node.operator = operator;
         return node;
@@ -46334,12 +56202,12 @@ var ts;
     }
     ts.updatePostfix = updatePostfix;
     function createBinary(left, operator, right) {
-        var node = createSynthesizedNode(200);
+        var node = createSynthesizedNode(200 /* BinaryExpression */);
         var operatorToken = asToken(operator);
         var operatorKind = operatorToken.kind;
-        node.left = ts.parenthesizeBinaryOperand(operatorKind, left, true, undefined);
+        node.left = ts.parenthesizeBinaryOperand(operatorKind, left, /*isLeftSideOfBinary*/ true, /*leftOperand*/ undefined);
         node.operatorToken = operatorToken;
-        node.right = ts.parenthesizeBinaryOperand(operatorKind, right, false, node.left);
+        node.right = ts.parenthesizeBinaryOperand(operatorKind, right, /*isLeftSideOfBinary*/ false, node.left);
         return node;
     }
     ts.createBinary = createBinary;
@@ -46351,11 +56219,11 @@ var ts;
     }
     ts.updateBinary = updateBinary;
     function createConditional(condition, questionTokenOrWhenTrue, whenTrueOrWhenFalse, colonToken, whenFalse) {
-        var node = createSynthesizedNode(201);
+        var node = createSynthesizedNode(201 /* ConditionalExpression */);
         node.condition = ts.parenthesizeForConditionalHead(condition);
-        node.questionToken = whenFalse ? questionTokenOrWhenTrue : createToken(55);
+        node.questionToken = whenFalse ? questionTokenOrWhenTrue : createToken(55 /* QuestionToken */);
         node.whenTrue = ts.parenthesizeSubexpressionOfConditionalExpression(whenFalse ? whenTrueOrWhenFalse : questionTokenOrWhenTrue);
-        node.colonToken = whenFalse ? colonToken : createToken(56);
+        node.colonToken = whenFalse ? colonToken : createToken(56 /* ColonToken */);
         node.whenFalse = ts.parenthesizeSubexpressionOfConditionalExpression(whenFalse ? whenFalse : whenTrueOrWhenFalse);
         return node;
     }
@@ -46381,7 +56249,7 @@ var ts;
     }
     ts.updateConditional = updateConditional;
     function createTemplateExpression(head, templateSpans) {
-        var node = createSynthesizedNode(202);
+        var node = createSynthesizedNode(202 /* TemplateExpression */);
         node.head = head;
         node.templateSpans = createNodeArray(templateSpans);
         return node;
@@ -46395,33 +56263,33 @@ var ts;
     }
     ts.updateTemplateExpression = updateTemplateExpression;
     function createTemplateHead(text) {
-        var node = createSynthesizedNode(14);
+        var node = createSynthesizedNode(14 /* TemplateHead */);
         node.text = text;
         return node;
     }
     ts.createTemplateHead = createTemplateHead;
     function createTemplateMiddle(text) {
-        var node = createSynthesizedNode(15);
+        var node = createSynthesizedNode(15 /* TemplateMiddle */);
         node.text = text;
         return node;
     }
     ts.createTemplateMiddle = createTemplateMiddle;
     function createTemplateTail(text) {
-        var node = createSynthesizedNode(16);
+        var node = createSynthesizedNode(16 /* TemplateTail */);
         node.text = text;
         return node;
     }
     ts.createTemplateTail = createTemplateTail;
     function createNoSubstitutionTemplateLiteral(text) {
-        var node = createSynthesizedNode(13);
+        var node = createSynthesizedNode(13 /* NoSubstitutionTemplateLiteral */);
         node.text = text;
         return node;
     }
     ts.createNoSubstitutionTemplateLiteral = createNoSubstitutionTemplateLiteral;
     function createYield(asteriskTokenOrExpression, expression) {
-        var node = createSynthesizedNode(203);
-        node.asteriskToken = asteriskTokenOrExpression && asteriskTokenOrExpression.kind === 39 ? asteriskTokenOrExpression : undefined;
-        node.expression = asteriskTokenOrExpression && asteriskTokenOrExpression.kind !== 39 ? asteriskTokenOrExpression : expression;
+        var node = createSynthesizedNode(203 /* YieldExpression */);
+        node.asteriskToken = asteriskTokenOrExpression && asteriskTokenOrExpression.kind === 39 /* AsteriskToken */ ? asteriskTokenOrExpression : undefined;
+        node.expression = asteriskTokenOrExpression && asteriskTokenOrExpression.kind !== 39 /* AsteriskToken */ ? asteriskTokenOrExpression : expression;
         return node;
     }
     ts.createYield = createYield;
@@ -46433,7 +56301,7 @@ var ts;
     }
     ts.updateYield = updateYield;
     function createSpread(expression) {
-        var node = createSynthesizedNode(204);
+        var node = createSynthesizedNode(204 /* SpreadElement */);
         node.expression = ts.parenthesizeExpressionForList(expression);
         return node;
     }
@@ -46445,7 +56313,7 @@ var ts;
     }
     ts.updateSpread = updateSpread;
     function createClassExpression(modifiers, name, typeParameters, heritageClauses, members) {
-        var node = createSynthesizedNode(205);
+        var node = createSynthesizedNode(205 /* ClassExpression */);
         node.decorators = undefined;
         node.modifiers = asNodeArray(modifiers);
         node.name = asName(name);
@@ -46466,11 +56334,11 @@ var ts;
     }
     ts.updateClassExpression = updateClassExpression;
     function createOmittedExpression() {
-        return createSynthesizedNode(206);
+        return createSynthesizedNode(206 /* OmittedExpression */);
     }
     ts.createOmittedExpression = createOmittedExpression;
     function createExpressionWithTypeArguments(typeArguments, expression) {
-        var node = createSynthesizedNode(207);
+        var node = createSynthesizedNode(207 /* ExpressionWithTypeArguments */);
         node.expression = ts.parenthesizeForAccess(expression);
         node.typeArguments = asNodeArray(typeArguments);
         return node;
@@ -46484,7 +56352,7 @@ var ts;
     }
     ts.updateExpressionWithTypeArguments = updateExpressionWithTypeArguments;
     function createAsExpression(expression, type) {
-        var node = createSynthesizedNode(208);
+        var node = createSynthesizedNode(208 /* AsExpression */);
         node.expression = expression;
         node.type = type;
         return node;
@@ -46498,7 +56366,7 @@ var ts;
     }
     ts.updateAsExpression = updateAsExpression;
     function createNonNullExpression(expression) {
-        var node = createSynthesizedNode(209);
+        var node = createSynthesizedNode(209 /* NonNullExpression */);
         node.expression = ts.parenthesizeForAccess(expression);
         return node;
     }
@@ -46510,7 +56378,7 @@ var ts;
     }
     ts.updateNonNullExpression = updateNonNullExpression;
     function createMetaProperty(keywordToken, name) {
-        var node = createSynthesizedNode(210);
+        var node = createSynthesizedNode(210 /* MetaProperty */);
         node.keywordToken = keywordToken;
         node.name = name;
         return node;
@@ -46522,8 +56390,9 @@ var ts;
             : node;
     }
     ts.updateMetaProperty = updateMetaProperty;
+    // Misc
     function createTemplateSpan(expression, literal) {
-        var node = createSynthesizedNode(211);
+        var node = createSynthesizedNode(211 /* TemplateSpan */);
         node.expression = expression;
         node.literal = literal;
         return node;
@@ -46537,19 +56406,21 @@ var ts;
     }
     ts.updateTemplateSpan = updateTemplateSpan;
     function createSemicolonClassElement() {
-        return createSynthesizedNode(212);
+        return createSynthesizedNode(212 /* SemicolonClassElement */);
     }
     ts.createSemicolonClassElement = createSemicolonClassElement;
+    // Element
     function createBlock(statements, multiLine) {
-        var block = createSynthesizedNode(213);
+        var block = createSynthesizedNode(213 /* Block */);
         block.statements = createNodeArray(statements);
         if (multiLine)
             block.multiLine = multiLine;
         return block;
     }
     ts.createBlock = createBlock;
+    /* @internal */
     function createExpressionStatement(expression) {
-        var node = createSynthesizedNode(216);
+        var node = createSynthesizedNode(216 /* ExpressionStatement */);
         node.expression = expression;
         return node;
     }
@@ -46561,7 +56432,7 @@ var ts;
     }
     ts.updateBlock = updateBlock;
     function createVariableStatement(modifiers, declarationList) {
-        var node = createSynthesizedNode(214);
+        var node = createSynthesizedNode(214 /* VariableStatement */);
         node.decorators = undefined;
         node.modifiers = asNodeArray(modifiers);
         node.declarationList = ts.isArray(declarationList) ? createVariableDeclarationList(declarationList) : declarationList;
@@ -46576,7 +56447,7 @@ var ts;
     }
     ts.updateVariableStatement = updateVariableStatement;
     function createEmptyStatement() {
-        return createSynthesizedNode(215);
+        return createSynthesizedNode(215 /* EmptyStatement */);
     }
     ts.createEmptyStatement = createEmptyStatement;
     function createStatement(expression) {
@@ -46590,7 +56461,7 @@ var ts;
     }
     ts.updateStatement = updateStatement;
     function createIf(expression, thenStatement, elseStatement) {
-        var node = createSynthesizedNode(217);
+        var node = createSynthesizedNode(217 /* IfStatement */);
         node.expression = expression;
         node.thenStatement = thenStatement;
         node.elseStatement = elseStatement;
@@ -46606,7 +56477,7 @@ var ts;
     }
     ts.updateIf = updateIf;
     function createDo(statement, expression) {
-        var node = createSynthesizedNode(218);
+        var node = createSynthesizedNode(218 /* DoStatement */);
         node.statement = statement;
         node.expression = expression;
         return node;
@@ -46620,7 +56491,7 @@ var ts;
     }
     ts.updateDo = updateDo;
     function createWhile(expression, statement) {
-        var node = createSynthesizedNode(219);
+        var node = createSynthesizedNode(219 /* WhileStatement */);
         node.expression = expression;
         node.statement = statement;
         return node;
@@ -46634,7 +56505,7 @@ var ts;
     }
     ts.updateWhile = updateWhile;
     function createFor(initializer, condition, incrementor, statement) {
-        var node = createSynthesizedNode(220);
+        var node = createSynthesizedNode(220 /* ForStatement */);
         node.initializer = initializer;
         node.condition = condition;
         node.incrementor = incrementor;
@@ -46652,7 +56523,7 @@ var ts;
     }
     ts.updateFor = updateFor;
     function createForIn(initializer, expression, statement) {
-        var node = createSynthesizedNode(221);
+        var node = createSynthesizedNode(221 /* ForInStatement */);
         node.initializer = initializer;
         node.expression = expression;
         node.statement = statement;
@@ -46668,7 +56539,7 @@ var ts;
     }
     ts.updateForIn = updateForIn;
     function createForOf(awaitModifier, initializer, expression, statement) {
-        var node = createSynthesizedNode(222);
+        var node = createSynthesizedNode(222 /* ForOfStatement */);
         node.awaitModifier = awaitModifier;
         node.initializer = initializer;
         node.expression = expression;
@@ -46686,7 +56557,7 @@ var ts;
     }
     ts.updateForOf = updateForOf;
     function createContinue(label) {
-        var node = createSynthesizedNode(223);
+        var node = createSynthesizedNode(223 /* ContinueStatement */);
         node.label = asName(label);
         return node;
     }
@@ -46698,7 +56569,7 @@ var ts;
     }
     ts.updateContinue = updateContinue;
     function createBreak(label) {
-        var node = createSynthesizedNode(224);
+        var node = createSynthesizedNode(224 /* BreakStatement */);
         node.label = asName(label);
         return node;
     }
@@ -46710,7 +56581,7 @@ var ts;
     }
     ts.updateBreak = updateBreak;
     function createReturn(expression) {
-        var node = createSynthesizedNode(225);
+        var node = createSynthesizedNode(225 /* ReturnStatement */);
         node.expression = expression;
         return node;
     }
@@ -46722,7 +56593,7 @@ var ts;
     }
     ts.updateReturn = updateReturn;
     function createWith(expression, statement) {
-        var node = createSynthesizedNode(226);
+        var node = createSynthesizedNode(226 /* WithStatement */);
         node.expression = expression;
         node.statement = statement;
         return node;
@@ -46736,7 +56607,7 @@ var ts;
     }
     ts.updateWith = updateWith;
     function createSwitch(expression, caseBlock) {
-        var node = createSynthesizedNode(227);
+        var node = createSynthesizedNode(227 /* SwitchStatement */);
         node.expression = ts.parenthesizeExpressionForList(expression);
         node.caseBlock = caseBlock;
         return node;
@@ -46750,7 +56621,7 @@ var ts;
     }
     ts.updateSwitch = updateSwitch;
     function createLabel(label, statement) {
-        var node = createSynthesizedNode(228);
+        var node = createSynthesizedNode(228 /* LabeledStatement */);
         node.label = asName(label);
         node.statement = statement;
         return node;
@@ -46764,7 +56635,7 @@ var ts;
     }
     ts.updateLabel = updateLabel;
     function createThrow(expression) {
-        var node = createSynthesizedNode(229);
+        var node = createSynthesizedNode(229 /* ThrowStatement */);
         node.expression = expression;
         return node;
     }
@@ -46776,7 +56647,7 @@ var ts;
     }
     ts.updateThrow = updateThrow;
     function createTry(tryBlock, catchClause, finallyBlock) {
-        var node = createSynthesizedNode(230);
+        var node = createSynthesizedNode(230 /* TryStatement */);
         node.tryBlock = tryBlock;
         node.catchClause = catchClause;
         node.finallyBlock = finallyBlock;
@@ -46792,11 +56663,11 @@ var ts;
     }
     ts.updateTry = updateTry;
     function createDebuggerStatement() {
-        return createSynthesizedNode(231);
+        return createSynthesizedNode(231 /* DebuggerStatement */);
     }
     ts.createDebuggerStatement = createDebuggerStatement;
     function createVariableDeclaration(name, type, initializer) {
-        var node = createSynthesizedNode(232);
+        var node = createSynthesizedNode(232 /* VariableDeclaration */);
         node.name = asName(name);
         node.type = type;
         node.initializer = initializer !== undefined ? ts.parenthesizeExpressionForList(initializer) : undefined;
@@ -46812,9 +56683,9 @@ var ts;
     }
     ts.updateVariableDeclaration = updateVariableDeclaration;
     function createVariableDeclarationList(declarations, flags) {
-        if (flags === void 0) { flags = 0; }
-        var node = createSynthesizedNode(233);
-        node.flags |= flags & 3;
+        if (flags === void 0) { flags = 0 /* None */; }
+        var node = createSynthesizedNode(233 /* VariableDeclarationList */);
+        node.flags |= flags & 3 /* BlockScoped */;
         node.declarations = createNodeArray(declarations);
         return node;
     }
@@ -46826,7 +56697,7 @@ var ts;
     }
     ts.updateVariableDeclarationList = updateVariableDeclarationList;
     function createFunctionDeclaration(decorators, modifiers, asteriskToken, name, typeParameters, parameters, type, body) {
-        var node = createSynthesizedNode(234);
+        var node = createSynthesizedNode(234 /* FunctionDeclaration */);
         node.decorators = asNodeArray(decorators);
         node.modifiers = asNodeArray(modifiers);
         node.asteriskToken = asteriskToken;
@@ -46852,7 +56723,7 @@ var ts;
     }
     ts.updateFunctionDeclaration = updateFunctionDeclaration;
     function createClassDeclaration(decorators, modifiers, name, typeParameters, heritageClauses, members) {
-        var node = createSynthesizedNode(235);
+        var node = createSynthesizedNode(235 /* ClassDeclaration */);
         node.decorators = asNodeArray(decorators);
         node.modifiers = asNodeArray(modifiers);
         node.name = asName(name);
@@ -46874,7 +56745,7 @@ var ts;
     }
     ts.updateClassDeclaration = updateClassDeclaration;
     function createInterfaceDeclaration(decorators, modifiers, name, typeParameters, heritageClauses, members) {
-        var node = createSynthesizedNode(236);
+        var node = createSynthesizedNode(236 /* InterfaceDeclaration */);
         node.decorators = asNodeArray(decorators);
         node.modifiers = asNodeArray(modifiers);
         node.name = asName(name);
@@ -46896,7 +56767,7 @@ var ts;
     }
     ts.updateInterfaceDeclaration = updateInterfaceDeclaration;
     function createTypeAliasDeclaration(decorators, modifiers, name, typeParameters, type) {
-        var node = createSynthesizedNode(237);
+        var node = createSynthesizedNode(237 /* TypeAliasDeclaration */);
         node.decorators = asNodeArray(decorators);
         node.modifiers = asNodeArray(modifiers);
         node.name = asName(name);
@@ -46916,7 +56787,7 @@ var ts;
     }
     ts.updateTypeAliasDeclaration = updateTypeAliasDeclaration;
     function createEnumDeclaration(decorators, modifiers, name, members) {
-        var node = createSynthesizedNode(238);
+        var node = createSynthesizedNode(238 /* EnumDeclaration */);
         node.decorators = asNodeArray(decorators);
         node.modifiers = asNodeArray(modifiers);
         node.name = asName(name);
@@ -46934,9 +56805,9 @@ var ts;
     }
     ts.updateEnumDeclaration = updateEnumDeclaration;
     function createModuleDeclaration(decorators, modifiers, name, body, flags) {
-        if (flags === void 0) { flags = 0; }
-        var node = createSynthesizedNode(239);
-        node.flags |= flags & (16 | 4 | 512);
+        if (flags === void 0) { flags = 0 /* None */; }
+        var node = createSynthesizedNode(239 /* ModuleDeclaration */);
+        node.flags |= flags & (16 /* Namespace */ | 4 /* NestedNamespace */ | 512 /* GlobalAugmentation */);
         node.decorators = asNodeArray(decorators);
         node.modifiers = asNodeArray(modifiers);
         node.name = name;
@@ -46954,7 +56825,7 @@ var ts;
     }
     ts.updateModuleDeclaration = updateModuleDeclaration;
     function createModuleBlock(statements) {
-        var node = createSynthesizedNode(240);
+        var node = createSynthesizedNode(240 /* ModuleBlock */);
         node.statements = createNodeArray(statements);
         return node;
     }
@@ -46966,7 +56837,7 @@ var ts;
     }
     ts.updateModuleBlock = updateModuleBlock;
     function createCaseBlock(clauses) {
-        var node = createSynthesizedNode(241);
+        var node = createSynthesizedNode(241 /* CaseBlock */);
         node.clauses = createNodeArray(clauses);
         return node;
     }
@@ -46978,7 +56849,7 @@ var ts;
     }
     ts.updateCaseBlock = updateCaseBlock;
     function createNamespaceExportDeclaration(name) {
-        var node = createSynthesizedNode(242);
+        var node = createSynthesizedNode(242 /* NamespaceExportDeclaration */);
         node.name = asName(name);
         return node;
     }
@@ -46990,7 +56861,7 @@ var ts;
     }
     ts.updateNamespaceExportDeclaration = updateNamespaceExportDeclaration;
     function createImportEqualsDeclaration(decorators, modifiers, name, moduleReference) {
-        var node = createSynthesizedNode(243);
+        var node = createSynthesizedNode(243 /* ImportEqualsDeclaration */);
         node.decorators = asNodeArray(decorators);
         node.modifiers = asNodeArray(modifiers);
         node.name = asName(name);
@@ -47008,7 +56879,7 @@ var ts;
     }
     ts.updateImportEqualsDeclaration = updateImportEqualsDeclaration;
     function createImportDeclaration(decorators, modifiers, importClause, moduleSpecifier) {
-        var node = createSynthesizedNode(244);
+        var node = createSynthesizedNode(244 /* ImportDeclaration */);
         node.decorators = asNodeArray(decorators);
         node.modifiers = asNodeArray(modifiers);
         node.importClause = importClause;
@@ -47026,7 +56897,7 @@ var ts;
     }
     ts.updateImportDeclaration = updateImportDeclaration;
     function createImportClause(name, namedBindings) {
-        var node = createSynthesizedNode(245);
+        var node = createSynthesizedNode(245 /* ImportClause */);
         node.name = name;
         node.namedBindings = namedBindings;
         return node;
@@ -47040,7 +56911,7 @@ var ts;
     }
     ts.updateImportClause = updateImportClause;
     function createNamespaceImport(name) {
-        var node = createSynthesizedNode(246);
+        var node = createSynthesizedNode(246 /* NamespaceImport */);
         node.name = name;
         return node;
     }
@@ -47052,7 +56923,7 @@ var ts;
     }
     ts.updateNamespaceImport = updateNamespaceImport;
     function createNamedImports(elements) {
-        var node = createSynthesizedNode(247);
+        var node = createSynthesizedNode(247 /* NamedImports */);
         node.elements = createNodeArray(elements);
         return node;
     }
@@ -47064,7 +56935,7 @@ var ts;
     }
     ts.updateNamedImports = updateNamedImports;
     function createImportSpecifier(propertyName, name) {
-        var node = createSynthesizedNode(248);
+        var node = createSynthesizedNode(248 /* ImportSpecifier */);
         node.propertyName = propertyName;
         node.name = name;
         return node;
@@ -47078,11 +56949,11 @@ var ts;
     }
     ts.updateImportSpecifier = updateImportSpecifier;
     function createExportAssignment(decorators, modifiers, isExportEquals, expression) {
-        var node = createSynthesizedNode(249);
+        var node = createSynthesizedNode(249 /* ExportAssignment */);
         node.decorators = asNodeArray(decorators);
         node.modifiers = asNodeArray(modifiers);
         node.isExportEquals = isExportEquals;
-        node.expression = isExportEquals ? ts.parenthesizeBinaryOperand(58, expression, false, undefined) : ts.parenthesizeDefaultExpression(expression);
+        node.expression = isExportEquals ? ts.parenthesizeBinaryOperand(58 /* EqualsToken */, expression, /*isLeftSideOfBinary*/ false, /*leftOperand*/ undefined) : ts.parenthesizeDefaultExpression(expression);
         return node;
     }
     ts.createExportAssignment = createExportAssignment;
@@ -47095,7 +56966,7 @@ var ts;
     }
     ts.updateExportAssignment = updateExportAssignment;
     function createExportDeclaration(decorators, modifiers, exportClause, moduleSpecifier) {
-        var node = createSynthesizedNode(250);
+        var node = createSynthesizedNode(250 /* ExportDeclaration */);
         node.decorators = asNodeArray(decorators);
         node.modifiers = asNodeArray(modifiers);
         node.exportClause = exportClause;
@@ -47113,7 +56984,7 @@ var ts;
     }
     ts.updateExportDeclaration = updateExportDeclaration;
     function createNamedExports(elements) {
-        var node = createSynthesizedNode(251);
+        var node = createSynthesizedNode(251 /* NamedExports */);
         node.elements = createNodeArray(elements);
         return node;
     }
@@ -47125,7 +56996,7 @@ var ts;
     }
     ts.updateNamedExports = updateNamedExports;
     function createExportSpecifier(propertyName, name) {
-        var node = createSynthesizedNode(252);
+        var node = createSynthesizedNode(252 /* ExportSpecifier */);
         node.propertyName = asName(propertyName);
         node.name = asName(name);
         return node;
@@ -47138,8 +57009,9 @@ var ts;
             : node;
     }
     ts.updateExportSpecifier = updateExportSpecifier;
+    // Module references
     function createExternalModuleReference(expression) {
-        var node = createSynthesizedNode(254);
+        var node = createSynthesizedNode(254 /* ExternalModuleReference */);
         node.expression = expression;
         return node;
     }
@@ -47150,8 +57022,9 @@ var ts;
             : node;
     }
     ts.updateExternalModuleReference = updateExternalModuleReference;
+    // JSX
     function createJsxElement(openingElement, children, closingElement) {
-        var node = createSynthesizedNode(255);
+        var node = createSynthesizedNode(255 /* JsxElement */);
         node.openingElement = openingElement;
         node.children = createNodeArray(children);
         node.closingElement = closingElement;
@@ -47167,7 +57040,7 @@ var ts;
     }
     ts.updateJsxElement = updateJsxElement;
     function createJsxSelfClosingElement(tagName, typeArguments, attributes) {
-        var node = createSynthesizedNode(256);
+        var node = createSynthesizedNode(256 /* JsxSelfClosingElement */);
         node.tagName = tagName;
         node.typeArguments = typeArguments && createNodeArray(typeArguments);
         node.attributes = attributes;
@@ -47183,7 +57056,7 @@ var ts;
     }
     ts.updateJsxSelfClosingElement = updateJsxSelfClosingElement;
     function createJsxOpeningElement(tagName, typeArguments, attributes) {
-        var node = createSynthesizedNode(257);
+        var node = createSynthesizedNode(257 /* JsxOpeningElement */);
         node.tagName = tagName;
         node.typeArguments = typeArguments && createNodeArray(typeArguments);
         node.attributes = attributes;
@@ -47199,7 +57072,7 @@ var ts;
     }
     ts.updateJsxOpeningElement = updateJsxOpeningElement;
     function createJsxClosingElement(tagName) {
-        var node = createSynthesizedNode(258);
+        var node = createSynthesizedNode(258 /* JsxClosingElement */);
         node.tagName = tagName;
         return node;
     }
@@ -47211,7 +57084,7 @@ var ts;
     }
     ts.updateJsxClosingElement = updateJsxClosingElement;
     function createJsxFragment(openingFragment, children, closingFragment) {
-        var node = createSynthesizedNode(259);
+        var node = createSynthesizedNode(259 /* JsxFragment */);
         node.openingFragment = openingFragment;
         node.children = createNodeArray(children);
         node.closingFragment = closingFragment;
@@ -47227,7 +57100,7 @@ var ts;
     }
     ts.updateJsxFragment = updateJsxFragment;
     function createJsxAttribute(name, initializer) {
-        var node = createSynthesizedNode(262);
+        var node = createSynthesizedNode(262 /* JsxAttribute */);
         node.name = name;
         node.initializer = initializer;
         return node;
@@ -47241,7 +57114,7 @@ var ts;
     }
     ts.updateJsxAttribute = updateJsxAttribute;
     function createJsxAttributes(properties) {
-        var node = createSynthesizedNode(263);
+        var node = createSynthesizedNode(263 /* JsxAttributes */);
         node.properties = createNodeArray(properties);
         return node;
     }
@@ -47253,7 +57126,7 @@ var ts;
     }
     ts.updateJsxAttributes = updateJsxAttributes;
     function createJsxSpreadAttribute(expression) {
-        var node = createSynthesizedNode(264);
+        var node = createSynthesizedNode(264 /* JsxSpreadAttribute */);
         node.expression = expression;
         return node;
     }
@@ -47265,7 +57138,7 @@ var ts;
     }
     ts.updateJsxSpreadAttribute = updateJsxSpreadAttribute;
     function createJsxExpression(dotDotDotToken, expression) {
-        var node = createSynthesizedNode(265);
+        var node = createSynthesizedNode(265 /* JsxExpression */);
         node.dotDotDotToken = dotDotDotToken;
         node.expression = expression;
         return node;
@@ -47277,8 +57150,9 @@ var ts;
             : node;
     }
     ts.updateJsxExpression = updateJsxExpression;
+    // Clauses
     function createCaseClause(expression, statements) {
-        var node = createSynthesizedNode(266);
+        var node = createSynthesizedNode(266 /* CaseClause */);
         node.expression = ts.parenthesizeExpressionForList(expression);
         node.statements = createNodeArray(statements);
         return node;
@@ -47292,7 +57166,7 @@ var ts;
     }
     ts.updateCaseClause = updateCaseClause;
     function createDefaultClause(statements) {
-        var node = createSynthesizedNode(267);
+        var node = createSynthesizedNode(267 /* DefaultClause */);
         node.statements = createNodeArray(statements);
         return node;
     }
@@ -47304,7 +57178,7 @@ var ts;
     }
     ts.updateDefaultClause = updateDefaultClause;
     function createHeritageClause(token, types) {
-        var node = createSynthesizedNode(268);
+        var node = createSynthesizedNode(268 /* HeritageClause */);
         node.token = token;
         node.types = createNodeArray(types);
         return node;
@@ -47317,7 +57191,7 @@ var ts;
     }
     ts.updateHeritageClause = updateHeritageClause;
     function createCatchClause(variableDeclaration, block) {
-        var node = createSynthesizedNode(269);
+        var node = createSynthesizedNode(269 /* CatchClause */);
         node.variableDeclaration = ts.isString(variableDeclaration) ? createVariableDeclaration(variableDeclaration) : variableDeclaration;
         node.block = block;
         return node;
@@ -47330,8 +57204,9 @@ var ts;
             : node;
     }
     ts.updateCatchClause = updateCatchClause;
+    // Property assignments
     function createPropertyAssignment(name, initializer) {
-        var node = createSynthesizedNode(270);
+        var node = createSynthesizedNode(270 /* PropertyAssignment */);
         node.name = asName(name);
         node.questionToken = undefined;
         node.initializer = ts.parenthesizeExpressionForList(initializer);
@@ -47346,7 +57221,7 @@ var ts;
     }
     ts.updatePropertyAssignment = updatePropertyAssignment;
     function createShorthandPropertyAssignment(name, objectAssignmentInitializer) {
-        var node = createSynthesizedNode(271);
+        var node = createSynthesizedNode(271 /* ShorthandPropertyAssignment */);
         node.name = asName(name);
         node.objectAssignmentInitializer = objectAssignmentInitializer !== undefined ? ts.parenthesizeExpressionForList(objectAssignmentInitializer) : undefined;
         return node;
@@ -47360,8 +57235,8 @@ var ts;
     }
     ts.updateShorthandPropertyAssignment = updateShorthandPropertyAssignment;
     function createSpreadAssignment(expression) {
-        var node = createSynthesizedNode(272);
-        node.expression = expression !== undefined ? ts.parenthesizeExpressionForList(expression) : undefined;
+        var node = createSynthesizedNode(272 /* SpreadAssignment */);
+        node.expression = expression !== undefined ? ts.parenthesizeExpressionForList(expression) : undefined; // TODO: GH#18217
         return node;
     }
     ts.createSpreadAssignment = createSpreadAssignment;
@@ -47371,8 +57246,9 @@ var ts;
             : node;
     }
     ts.updateSpreadAssignment = updateSpreadAssignment;
+    // Enum
     function createEnumMember(name, initializer) {
-        var node = createSynthesizedNode(273);
+        var node = createSynthesizedNode(273 /* EnumMember */);
         node.name = asName(name);
         node.initializer = initializer && ts.parenthesizeExpressionForList(initializer);
         return node;
@@ -47385,13 +57261,15 @@ var ts;
             : node;
     }
     ts.updateEnumMember = updateEnumMember;
-    function updateSourceFileNode(node, statements, isDeclarationFile, referencedFiles, typeReferences, hasNoDefaultLib) {
+    // Top-level nodes
+    function updateSourceFileNode(node, statements, isDeclarationFile, referencedFiles, typeReferences, hasNoDefaultLib, libReferences) {
         if (node.statements !== statements ||
             (isDeclarationFile !== undefined && node.isDeclarationFile !== isDeclarationFile) ||
             (referencedFiles !== undefined && node.referencedFiles !== referencedFiles) ||
             (typeReferences !== undefined && node.typeReferenceDirectives !== typeReferences) ||
+            (libReferences !== undefined && node.libReferenceDirectives !== libReferences) ||
             (hasNoDefaultLib !== undefined && node.hasNoDefaultLib !== hasNoDefaultLib)) {
-            var updated = createSynthesizedNode(274);
+            var updated = createSynthesizedNode(274 /* SourceFile */);
             updated.flags |= node.flags;
             updated.statements = createNodeArray(statements);
             updated.endOfFileToken = node.endOfFileToken;
@@ -47402,6 +57280,7 @@ var ts;
             updated.referencedFiles = referencedFiles === undefined ? node.referencedFiles : referencedFiles;
             updated.typeReferenceDirectives = typeReferences === undefined ? node.typeReferenceDirectives : typeReferences;
             updated.hasNoDefaultLib = hasNoDefaultLib === undefined ? node.hasNoDefaultLib : hasNoDefaultLib;
+            updated.libReferenceDirectives = libReferences === undefined ? node.libReferenceDirectives : libReferences;
             if (node.amdDependencies !== undefined)
                 updated.amdDependencies = node.amdDependencies;
             if (node.moduleName !== undefined)
@@ -47455,6 +57334,9 @@ var ts;
         return node;
     }
     ts.updateSourceFileNode = updateSourceFileNode;
+    /**
+     * Creates a shallow, memberwise clone of a node for mutation.
+     */
     function getMutableClone(node) {
         var clone = getSynthesizedClone(node);
         clone.pos = node.pos;
@@ -47463,29 +57345,54 @@ var ts;
         return clone;
     }
     ts.getMutableClone = getMutableClone;
+    // Transformation nodes
+    /**
+     * Creates a synthetic statement to act as a placeholder for a not-emitted statement in
+     * order to preserve comments.
+     *
+     * @param original The original statement.
+     */
     function createNotEmittedStatement(original) {
-        var node = createSynthesizedNode(300);
+        var node = createSynthesizedNode(300 /* NotEmittedStatement */);
         node.original = original;
         setTextRange(node, original);
         return node;
     }
     ts.createNotEmittedStatement = createNotEmittedStatement;
+    /**
+     * Creates a synthetic element to act as a placeholder for the end of an emitted declaration in
+     * order to properly emit exports.
+     */
+    /* @internal */
     function createEndOfDeclarationMarker(original) {
-        var node = createSynthesizedNode(304);
+        var node = createSynthesizedNode(304 /* EndOfDeclarationMarker */);
         node.emitNode = {};
         node.original = original;
         return node;
     }
     ts.createEndOfDeclarationMarker = createEndOfDeclarationMarker;
+    /**
+     * Creates a synthetic element to act as a placeholder for the beginning of a merged declaration in
+     * order to properly emit exports.
+     */
+    /* @internal */
     function createMergeDeclarationMarker(original) {
-        var node = createSynthesizedNode(303);
+        var node = createSynthesizedNode(303 /* MergeDeclarationMarker */);
         node.emitNode = {};
         node.original = original;
         return node;
     }
     ts.createMergeDeclarationMarker = createMergeDeclarationMarker;
+    /**
+     * Creates a synthetic expression to act as a placeholder for a not-emitted expression in
+     * order to preserve comments or sourcemap positions.
+     *
+     * @param expression The inner expression to emit.
+     * @param original The original outer expression.
+     * @param location The location for the expression. Defaults to the positions from "original" if provided.
+     */
     function createPartiallyEmittedExpression(expression, original) {
-        var node = createSynthesizedNode(301);
+        var node = createSynthesizedNode(301 /* PartiallyEmittedExpression */);
         node.expression = expression;
         node.original = original;
         setTextRange(node, original);
@@ -47501,17 +57408,17 @@ var ts;
     ts.updatePartiallyEmittedExpression = updatePartiallyEmittedExpression;
     function flattenCommaElements(node) {
         if (ts.nodeIsSynthesized(node) && !ts.isParseTreeNode(node) && !node.original && !node.emitNode && !node.id) {
-            if (node.kind === 302) {
+            if (node.kind === 302 /* CommaListExpression */) {
                 return node.elements;
             }
-            if (ts.isBinaryExpression(node) && node.operatorToken.kind === 26) {
+            if (ts.isBinaryExpression(node) && node.operatorToken.kind === 26 /* CommaToken */) {
                 return [node.left, node.right];
             }
         }
         return node;
     }
     function createCommaList(elements) {
-        var node = createSynthesizedNode(302);
+        var node = createSynthesizedNode(302 /* CommaListExpression */);
         node.elements = createNodeArray(ts.sameFlatMap(elements, flattenCommaElements));
         return node;
     }
@@ -47524,22 +57431,25 @@ var ts;
     ts.updateCommaList = updateCommaList;
     function createBundle(sourceFiles, prepends) {
         if (prepends === void 0) { prepends = ts.emptyArray; }
-        var node = ts.createNode(275);
+        var node = ts.createNode(275 /* Bundle */);
         node.prepends = prepends;
         node.sourceFiles = sourceFiles;
         return node;
     }
     ts.createBundle = createBundle;
-    function createUnparsedSourceFile(text) {
-        var node = ts.createNode(276);
+    function createUnparsedSourceFile(text, map) {
+        var node = ts.createNode(276 /* UnparsedSource */);
         node.text = text;
+        node.sourceMapText = map;
         return node;
     }
     ts.createUnparsedSourceFile = createUnparsedSourceFile;
-    function createInputFiles(javascript, declaration) {
-        var node = ts.createNode(277);
+    function createInputFiles(javascript, declaration, javascriptMapText, declarationMapText) {
+        var node = ts.createNode(277 /* InputFiles */);
         node.javascriptText = javascript;
+        node.javascriptMapText = javascriptMapText;
         node.declarationText = declaration;
+        node.declarationMapText = declarationMapText;
         return node;
     }
     ts.createInputFiles = createInputFiles;
@@ -47552,55 +57462,70 @@ var ts;
     }
     ts.updateBundle = updateBundle;
     function createImmediatelyInvokedFunctionExpression(statements, param, paramValue) {
-        return createCall(createFunctionExpression(undefined, undefined, undefined, undefined, param ? [param] : [], undefined, createBlock(statements, true)), undefined, paramValue ? [paramValue] : []);
+        return createCall(createFunctionExpression(
+        /*modifiers*/ undefined, 
+        /*asteriskToken*/ undefined, 
+        /*name*/ undefined, 
+        /*typeParameters*/ undefined, 
+        /*parameters*/ param ? [param] : [], 
+        /*type*/ undefined, createBlock(statements, /*multiLine*/ true)), 
+        /*typeArguments*/ undefined, 
+        /*argumentsArray*/ paramValue ? [paramValue] : []);
     }
     ts.createImmediatelyInvokedFunctionExpression = createImmediatelyInvokedFunctionExpression;
     function createImmediatelyInvokedArrowFunction(statements, param, paramValue) {
-        return createCall(createArrowFunction(undefined, undefined, param ? [param] : [], undefined, undefined, createBlock(statements, true)), undefined, paramValue ? [paramValue] : []);
+        return createCall(createArrowFunction(
+        /*modifiers*/ undefined, 
+        /*typeParameters*/ undefined, 
+        /*parameters*/ param ? [param] : [], 
+        /*type*/ undefined, 
+        /*equalsGreaterThanToken*/ undefined, createBlock(statements, /*multiLine*/ true)), 
+        /*typeArguments*/ undefined, 
+        /*argumentsArray*/ paramValue ? [paramValue] : []);
     }
     ts.createImmediatelyInvokedArrowFunction = createImmediatelyInvokedArrowFunction;
     function createComma(left, right) {
-        return createBinary(left, 26, right);
+        return createBinary(left, 26 /* CommaToken */, right);
     }
     ts.createComma = createComma;
     function createLessThan(left, right) {
-        return createBinary(left, 27, right);
+        return createBinary(left, 27 /* LessThanToken */, right);
     }
     ts.createLessThan = createLessThan;
     function createAssignment(left, right) {
-        return createBinary(left, 58, right);
+        return createBinary(left, 58 /* EqualsToken */, right);
     }
     ts.createAssignment = createAssignment;
     function createStrictEquality(left, right) {
-        return createBinary(left, 34, right);
+        return createBinary(left, 34 /* EqualsEqualsEqualsToken */, right);
     }
     ts.createStrictEquality = createStrictEquality;
     function createStrictInequality(left, right) {
-        return createBinary(left, 35, right);
+        return createBinary(left, 35 /* ExclamationEqualsEqualsToken */, right);
     }
     ts.createStrictInequality = createStrictInequality;
     function createAdd(left, right) {
-        return createBinary(left, 37, right);
+        return createBinary(left, 37 /* PlusToken */, right);
     }
     ts.createAdd = createAdd;
     function createSubtract(left, right) {
-        return createBinary(left, 38, right);
+        return createBinary(left, 38 /* MinusToken */, right);
     }
     ts.createSubtract = createSubtract;
     function createPostfixIncrement(operand) {
-        return createPostfix(operand, 43);
+        return createPostfix(operand, 43 /* PlusPlusToken */);
     }
     ts.createPostfixIncrement = createPostfixIncrement;
     function createLogicalAnd(left, right) {
-        return createBinary(left, 53, right);
+        return createBinary(left, 53 /* AmpersandAmpersandToken */, right);
     }
     ts.createLogicalAnd = createLogicalAnd;
     function createLogicalOr(left, right) {
-        return createBinary(left, 54, right);
+        return createBinary(left, 54 /* BarBarToken */, right);
     }
     ts.createLogicalOr = createLogicalOr;
     function createLogicalNot(operand) {
-        return createPrefix(51, operand);
+        return createPrefix(51 /* ExclamationToken */, operand);
     }
     ts.createLogicalNot = createLogicalNot;
     function createVoidZero() {
@@ -47608,13 +57533,14 @@ var ts;
     }
     ts.createVoidZero = createVoidZero;
     function createExportDefault(expression) {
-        return createExportAssignment(undefined, undefined, false, expression);
+        return createExportAssignment(/*decorators*/ undefined, /*modifiers*/ undefined, /*isExportEquals*/ false, expression);
     }
     ts.createExportDefault = createExportDefault;
     function createExternalModuleExport(exportName) {
-        return createExportDeclaration(undefined, undefined, createNamedExports([createExportSpecifier(undefined, exportName)]));
+        return createExportDeclaration(/*decorators*/ undefined, /*modifiers*/ undefined, createNamedExports([createExportSpecifier(/*propertyName*/ undefined, exportName)]));
     }
     ts.createExternalModuleExport = createExternalModuleExport;
+    // Utilities
     function asName(name) {
         return ts.isString(name) ? createIdentifier(name) : name;
     }
@@ -47627,7 +57553,17 @@ var ts;
     function asToken(value) {
         return typeof value === "number" ? createToken(value) : value;
     }
+    /**
+     * Clears any EmitNode entries from parse-tree nodes.
+     * @param sourceFile A source file.
+     */
     function disposeEmitNodes(sourceFile) {
+        // During transformation we may need to annotate a parse tree node with transient
+        // transformation properties. As parse tree nodes live longer than transformation
+        // nodes, we need to make sure we reclaim any memory allocated for custom ranges
+        // from these nodes to ensure we do not hold onto entire subtrees just for position
+        // information. We also need to reset these nodes to a pre-transformation state
+        // for incremental parsing scenarios so that we do not impact later emit.
         sourceFile = ts.getSourceFileOfNode(ts.getParseTreeNode(sourceFile));
         var emitNode = sourceFile && sourceFile.emitNode;
         var annotatedNodes = emitNode && emitNode.annotatedNodes;
@@ -47639,10 +57575,18 @@ var ts;
         }
     }
     ts.disposeEmitNodes = disposeEmitNodes;
+    /**
+     * Associates a node with the current transformation, initializing
+     * various transient transformation properties.
+     */
+    /* @internal */
     function getOrCreateEmitNode(node) {
         if (!node.emitNode) {
             if (ts.isParseTreeNode(node)) {
-                if (node.kind === 274) {
+                // To avoid holding onto transformation artifacts, we keep track of any
+                // parse tree node we are annotating. This allows us to clean them up after
+                // all transformations have completed.
+                if (node.kind === 274 /* SourceFile */) {
                     return node.emitNode = { annotatedNodes: [node] };
                 }
                 var sourceFile = ts.getSourceFileOfNode(node);
@@ -47661,38 +57605,61 @@ var ts;
         return range;
     }
     ts.setTextRange = setTextRange;
+    /**
+     * Sets flags that control emit behavior of a node.
+     */
     function setEmitFlags(node, emitFlags) {
         getOrCreateEmitNode(node).flags = emitFlags;
         return node;
     }
     ts.setEmitFlags = setEmitFlags;
+    /**
+     * Sets flags that control emit behavior of a node.
+     */
+    /* @internal */
     function addEmitFlags(node, emitFlags) {
         var emitNode = getOrCreateEmitNode(node);
         emitNode.flags = emitNode.flags | emitFlags;
         return node;
     }
     ts.addEmitFlags = addEmitFlags;
+    /**
+     * Gets a custom text range to use when emitting source maps.
+     */
     function getSourceMapRange(node) {
         var emitNode = node.emitNode;
         return (emitNode && emitNode.sourceMapRange) || node;
     }
     ts.getSourceMapRange = getSourceMapRange;
+    /**
+     * Sets a custom text range to use when emitting source maps.
+     */
     function setSourceMapRange(node, range) {
         getOrCreateEmitNode(node).sourceMapRange = range;
         return node;
     }
     ts.setSourceMapRange = setSourceMapRange;
+    // tslint:disable-next-line variable-name
     var SourceMapSource;
+    /**
+     * Create an external source map source file reference
+     */
     function createSourceMapSource(fileName, text, skipTrivia) {
         return new (SourceMapSource || (SourceMapSource = ts.objectAllocator.getSourceMapSourceConstructor()))(fileName, text, skipTrivia);
     }
     ts.createSourceMapSource = createSourceMapSource;
+    /**
+     * Gets the TextRange to use for source maps for a token of a node.
+     */
     function getTokenSourceMapRange(node, token) {
         var emitNode = node.emitNode;
         var tokenSourceMapRanges = emitNode && emitNode.tokenSourceMapRanges;
         return tokenSourceMapRanges && tokenSourceMapRanges[token];
     }
     ts.getTokenSourceMapRange = getTokenSourceMapRange;
+    /**
+     * Sets the TextRange to use for source maps for a token of a node.
+     */
     function setTokenSourceMapRange(node, token, range) {
         var emitNode = getOrCreateEmitNode(node);
         var tokenSourceMapRanges = emitNode.tokenSourceMapRanges || (emitNode.tokenSourceMapRanges = []);
@@ -47700,21 +57667,35 @@ var ts;
         return node;
     }
     ts.setTokenSourceMapRange = setTokenSourceMapRange;
+    /**
+     * Gets a custom text range to use when emitting comments.
+     */
+    /*@internal*/
     function getStartsOnNewLine(node) {
         var emitNode = node.emitNode;
         return emitNode && emitNode.startsOnNewLine;
     }
     ts.getStartsOnNewLine = getStartsOnNewLine;
+    /**
+     * Sets a custom text range to use when emitting comments.
+     */
+    /*@internal*/
     function setStartsOnNewLine(node, newLine) {
         getOrCreateEmitNode(node).startsOnNewLine = newLine;
         return node;
     }
     ts.setStartsOnNewLine = setStartsOnNewLine;
+    /**
+     * Gets a custom text range to use when emitting comments.
+     */
     function getCommentRange(node) {
         var emitNode = node.emitNode;
         return (emitNode && emitNode.commentRange) || node;
     }
     ts.getCommentRange = getCommentRange;
+    /**
+     * Sets a custom text range to use when emitting comments.
+     */
     function setCommentRange(node, range) {
         getOrCreateEmitNode(node).commentRange = range;
         return node;
@@ -47757,23 +57738,35 @@ var ts;
         return node;
     }
     ts.moveSyntheticComments = moveSyntheticComments;
+    /**
+     * Gets the constant value to emit for an expression.
+     */
     function getConstantValue(node) {
         var emitNode = node.emitNode;
         return emitNode && emitNode.constantValue;
     }
     ts.getConstantValue = getConstantValue;
+    /**
+     * Sets the constant value to emit for an expression.
+     */
     function setConstantValue(node, value) {
         var emitNode = getOrCreateEmitNode(node);
         emitNode.constantValue = value;
         return node;
     }
     ts.setConstantValue = setConstantValue;
+    /**
+     * Adds an EmitHelper to a node.
+     */
     function addEmitHelper(node, helper) {
         var emitNode = getOrCreateEmitNode(node);
         emitNode.helpers = ts.append(emitNode.helpers, helper);
         return node;
     }
     ts.addEmitHelper = addEmitHelper;
+    /**
+     * Add EmitHelpers to a node.
+     */
     function addEmitHelpers(node, helpers) {
         if (ts.some(helpers)) {
             var emitNode = getOrCreateEmitNode(node);
@@ -47785,6 +57778,9 @@ var ts;
         return node;
     }
     ts.addEmitHelpers = addEmitHelpers;
+    /**
+     * Removes an EmitHelper from a node.
+     */
     function removeEmitHelper(node, helper) {
         var emitNode = node.emitNode;
         if (emitNode) {
@@ -47796,11 +57792,17 @@ var ts;
         return false;
     }
     ts.removeEmitHelper = removeEmitHelper;
+    /**
+     * Gets the EmitHelpers of a node.
+     */
     function getEmitHelpers(node) {
         var emitNode = node.emitNode;
         return emitNode && emitNode.helpers;
     }
     ts.getEmitHelpers = getEmitHelpers;
+    /**
+     * Moves matching emit helpers from a source node to a target node.
+     */
     function moveEmitHelpers(source, target, predicate) {
         var sourceEmitNode = source.emitNode;
         var sourceEmitHelpers = sourceEmitNode && sourceEmitNode.helpers;
@@ -47823,15 +57825,16 @@ var ts;
         }
     }
     ts.moveEmitHelpers = moveEmitHelpers;
+    /* @internal */
     function compareEmitHelpers(x, y) {
         if (x === y)
-            return 0;
+            return 0 /* EqualTo */;
         if (x.priority === y.priority)
-            return 0;
+            return 0 /* EqualTo */;
         if (x.priority === undefined)
-            return 1;
+            return 1 /* GreaterThan */;
         if (y.priority === undefined)
-            return -1;
+            return -1 /* LessThan */;
         return ts.compareValues(x.priority, y.priority);
     }
     ts.compareEmitHelpers = compareEmitHelpers;
@@ -47849,6 +57852,7 @@ var ts;
         var flags = sourceEmitNode.flags, leadingComments = sourceEmitNode.leadingComments, trailingComments = sourceEmitNode.trailingComments, commentRange = sourceEmitNode.commentRange, sourceMapRange = sourceEmitNode.sourceMapRange, tokenSourceMapRanges = sourceEmitNode.tokenSourceMapRanges, constantValue = sourceEmitNode.constantValue, helpers = sourceEmitNode.helpers, startsOnNewLine = sourceEmitNode.startsOnNewLine;
         if (!destEmitNode)
             destEmitNode = {};
+        // We are using `.slice()` here in case `destEmitNode.leadingComments` is pushed to later.
         if (leadingComments)
             destEmitNode.leadingComments = ts.addRange(leadingComments.slice(), destEmitNode.leadingComments);
         if (trailingComments)
@@ -47878,6 +57882,7 @@ var ts;
         return destRanges;
     }
 })(ts || (ts = {}));
+/* @internal */
 (function (ts) {
     ts.nullTransformationContext = {
         enableEmitNotification: ts.noop,
@@ -47913,19 +57918,21 @@ var ts;
             var expression = ts.setTextRange(ts.isIdentifier(memberName)
                 ? ts.createPropertyAccess(target, memberName)
                 : ts.createElementAccess(target, memberName), memberName);
-            ts.getOrCreateEmitNode(expression).flags |= 64;
+            ts.getOrCreateEmitNode(expression).flags |= 64 /* NoNestedSourceMaps */;
             return expression;
         }
     }
     ts.createMemberAccessForPropertyName = createMemberAccessForPropertyName;
     function createFunctionCall(func, thisArg, argumentsList, location) {
-        return ts.setTextRange(ts.createCall(ts.createPropertyAccess(func, "call"), undefined, [
+        return ts.setTextRange(ts.createCall(ts.createPropertyAccess(func, "call"), 
+        /*typeArguments*/ undefined, [
             thisArg
         ].concat(argumentsList)), location);
     }
     ts.createFunctionCall = createFunctionCall;
     function createFunctionApply(func, thisArg, argumentsExpression, location) {
-        return ts.setTextRange(ts.createCall(ts.createPropertyAccess(func, "apply"), undefined, [
+        return ts.setTextRange(ts.createCall(ts.createPropertyAccess(func, "apply"), 
+        /*typeArguments*/ undefined, [
             thisArg,
             argumentsExpression
         ]), location);
@@ -47936,20 +57943,27 @@ var ts;
         if (start !== undefined) {
             argumentsList.push(typeof start === "number" ? ts.createLiteral(start) : start);
         }
-        return ts.createCall(ts.createPropertyAccess(array, "slice"), undefined, argumentsList);
+        return ts.createCall(ts.createPropertyAccess(array, "slice"), /*typeArguments*/ undefined, argumentsList);
     }
     ts.createArraySlice = createArraySlice;
     function createArrayConcat(array, values) {
-        return ts.createCall(ts.createPropertyAccess(array, "concat"), undefined, values);
+        return ts.createCall(ts.createPropertyAccess(array, "concat"), 
+        /*typeArguments*/ undefined, values);
     }
     ts.createArrayConcat = createArrayConcat;
     function createMathPow(left, right, location) {
-        return ts.setTextRange(ts.createCall(ts.createPropertyAccess(ts.createIdentifier("Math"), "pow"), undefined, [left, right]), location);
+        return ts.setTextRange(ts.createCall(ts.createPropertyAccess(ts.createIdentifier("Math"), "pow"), 
+        /*typeArguments*/ undefined, [left, right]), location);
     }
     ts.createMathPow = createMathPow;
     function createReactNamespace(reactNamespace, parent) {
+        // To ensure the emit resolver can properly resolve the namespace, we need to
+        // treat this identifier as if it were a source tree node by clearing the `Synthesized`
+        // flag and setting a parent node.
         var react = ts.createIdentifier(reactNamespace || "React");
-        react.flags &= ~8;
+        react.flags &= ~8 /* Synthesized */;
+        // Set the parent that is in parse tree
+        // this makes sure that parent chain is intact for checker to traverse complete scope tree
         react.parent = ts.getParseTreeNode(parent);
         return react;
     }
@@ -47989,7 +58003,8 @@ var ts;
                 argumentsList.push(children[0]);
             }
         }
-        return ts.setTextRange(ts.createCall(createJsxFactoryExpression(jsxFactoryEntity, reactNamespace, parentElement), undefined, argumentsList), location);
+        return ts.setTextRange(ts.createCall(createJsxFactoryExpression(jsxFactoryEntity, reactNamespace, parentElement), 
+        /*typeArguments*/ undefined, argumentsList), location);
     }
     ts.createExpressionForJsxElement = createExpressionForJsxElement;
     function createExpressionForJsxFragment(jsxFactoryEntity, reactNamespace, children, parentElement, location) {
@@ -48008,11 +58023,13 @@ var ts;
                 argumentsList.push(children[0]);
             }
         }
-        return ts.setTextRange(ts.createCall(createJsxFactoryExpression(jsxFactoryEntity, reactNamespace, parentElement), undefined, argumentsList), location);
+        return ts.setTextRange(ts.createCall(createJsxFactoryExpression(jsxFactoryEntity, reactNamespace, parentElement), 
+        /*typeArguments*/ undefined, argumentsList), location);
     }
     ts.createExpressionForJsxFragment = createExpressionForJsxFragment;
+    // Helpers
     function getHelperName(name) {
-        return ts.setEmitFlags(ts.createIdentifier(name), 4096 | 2);
+        return ts.setEmitFlags(ts.createIdentifier(name), 4096 /* HelperName */ | 2 /* AdviseOnEmitNode */);
     }
     ts.getHelperName = getHelperName;
     var valuesHelper = {
@@ -48022,7 +58039,8 @@ var ts;
     };
     function createValuesHelper(context, expression, location) {
         context.requestEmitHelper(valuesHelper);
-        return ts.setTextRange(ts.createCall(getHelperName("__values"), undefined, [expression]), location);
+        return ts.setTextRange(ts.createCall(getHelperName("__values"), 
+        /*typeArguments*/ undefined, [expression]), location);
     }
     ts.createValuesHelper = createValuesHelper;
     var readHelper = {
@@ -48032,7 +58050,8 @@ var ts;
     };
     function createReadHelper(context, iteratorRecord, count, location) {
         context.requestEmitHelper(readHelper);
-        return ts.setTextRange(ts.createCall(getHelperName("__read"), undefined, count !== undefined
+        return ts.setTextRange(ts.createCall(getHelperName("__read"), 
+        /*typeArguments*/ undefined, count !== undefined
             ? [iteratorRecord, ts.createLiteral(count)]
             : [iteratorRecord]), location);
     }
@@ -48045,18 +58064,23 @@ var ts;
     function createSpreadHelper(context, argumentList, location) {
         context.requestEmitHelper(readHelper);
         context.requestEmitHelper(spreadHelper);
-        return ts.setTextRange(ts.createCall(getHelperName("__spread"), undefined, argumentList), location);
+        return ts.setTextRange(ts.createCall(getHelperName("__spread"), 
+        /*typeArguments*/ undefined, argumentList), location);
     }
     ts.createSpreadHelper = createSpreadHelper;
+    // Utilities
     function createForOfBindingStatement(node, boundValue) {
         if (ts.isVariableDeclarationList(node)) {
             var firstDeclaration = ts.first(node.declarations);
-            var updatedDeclaration = ts.updateVariableDeclaration(firstDeclaration, firstDeclaration.name, undefined, boundValue);
-            return ts.setTextRange(ts.createVariableStatement(undefined, ts.updateVariableDeclarationList(node, [updatedDeclaration])), node);
+            var updatedDeclaration = ts.updateVariableDeclaration(firstDeclaration, firstDeclaration.name, 
+            /*typeNode*/ undefined, boundValue);
+            return ts.setTextRange(ts.createVariableStatement(
+            /*modifiers*/ undefined, ts.updateVariableDeclarationList(node, [updatedDeclaration])), 
+            /*location*/ node);
         }
         else {
-            var updatedExpression = ts.setTextRange(ts.createAssignment(node, boundValue), node);
-            return ts.setTextRange(ts.createStatement(updatedExpression), node);
+            var updatedExpression = ts.setTextRange(ts.createAssignment(node, boundValue), /*location*/ node);
+            return ts.setTextRange(ts.createStatement(updatedExpression), /*location*/ node);
         }
     }
     ts.createForOfBindingStatement = createForOfBindingStatement;
@@ -48065,7 +58089,7 @@ var ts;
             return ts.updateBlock(dest, ts.setTextRange(ts.createNodeArray([source].concat(dest.statements)), dest.statements));
         }
         else {
-            return ts.createBlock(ts.createNodeArray([dest, source]), true);
+            return ts.createBlock(ts.createNodeArray([dest, source]), /*multiLine*/ true);
         }
     }
     ts.insertLeadingStatement = insertLeadingStatement;
@@ -48073,7 +58097,7 @@ var ts;
         if (!outermostLabeledStatement) {
             return node;
         }
-        var updated = ts.updateLabel(outermostLabeledStatement, outermostLabeledStatement.label, outermostLabeledStatement.statement.kind === 228
+        var updated = ts.updateLabel(outermostLabeledStatement, outermostLabeledStatement.label, outermostLabeledStatement.statement.kind === 228 /* LabeledStatement */
             ? restoreEnclosingLabel(node, outermostLabeledStatement.statement)
             : node);
         if (afterRestoreLabelCallback) {
@@ -48085,19 +58109,19 @@ var ts;
     function shouldBeCapturedInTempVariable(node, cacheIdentifiers) {
         var target = ts.skipParentheses(node);
         switch (target.kind) {
-            case 71:
+            case 71 /* Identifier */:
                 return cacheIdentifiers;
-            case 99:
-            case 8:
-            case 9:
+            case 99 /* ThisKeyword */:
+            case 8 /* NumericLiteral */:
+            case 9 /* StringLiteral */:
                 return false;
-            case 183:
+            case 183 /* ArrayLiteralExpression */:
                 var elements = target.elements;
                 if (elements.length === 0) {
                     return false;
                 }
                 return true;
-            case 184:
+            case 184 /* ObjectLiteralExpression */:
                 return target.properties.length > 0;
             default:
                 return true;
@@ -48105,27 +58129,28 @@ var ts;
     }
     function createCallBinding(expression, recordTempVariable, languageVersion, cacheIdentifiers) {
         if (cacheIdentifiers === void 0) { cacheIdentifiers = false; }
-        var callee = skipOuterExpressions(expression, 7);
+        var callee = skipOuterExpressions(expression, 7 /* All */);
         var thisArg;
         var target;
         if (ts.isSuperProperty(callee)) {
             thisArg = ts.createThis();
             target = callee;
         }
-        else if (callee.kind === 97) {
+        else if (callee.kind === 97 /* SuperKeyword */) {
             thisArg = ts.createThis();
-            target = languageVersion < 2
+            target = languageVersion < 2 /* ES2015 */
                 ? ts.setTextRange(ts.createIdentifier("_super"), callee)
                 : callee;
         }
-        else if (ts.getEmitFlags(callee) & 4096) {
+        else if (ts.getEmitFlags(callee) & 4096 /* HelperName */) {
             thisArg = ts.createVoidZero();
             target = parenthesizeForAccess(callee);
         }
         else {
             switch (callee.kind) {
-                case 185: {
+                case 185 /* PropertyAccessExpression */: {
                     if (shouldBeCapturedInTempVariable(callee.expression, cacheIdentifiers)) {
+                        // for `a.b()` target is `(_a = a).b` and thisArg is `_a`
                         thisArg = ts.createTempVariable(recordTempVariable);
                         target = ts.createPropertyAccess(ts.setTextRange(ts.createAssignment(thisArg, callee.expression), callee.expression), callee.name);
                         ts.setTextRange(target, callee);
@@ -48136,8 +58161,9 @@ var ts;
                     }
                     break;
                 }
-                case 186: {
+                case 186 /* ElementAccessExpression */: {
                     if (shouldBeCapturedInTempVariable(callee.expression, cacheIdentifiers)) {
+                        // for `a[b]()` target is `(_a = a)[b]` and thisArg is `_a`
                         thisArg = ts.createTempVariable(recordTempVariable);
                         target = ts.createElementAccess(ts.setTextRange(ts.createAssignment(thisArg, callee.expression), callee.expression), callee.argumentExpression);
                         ts.setTextRange(target, callee);
@@ -48149,6 +58175,7 @@ var ts;
                     break;
                 }
                 default: {
+                    // for `a()` target is `a` and thisArg is `void 0`
                     thisArg = ts.createVoidZero();
                     target = parenthesizeForAccess(expression);
                     break;
@@ -48159,6 +58186,8 @@ var ts;
     }
     ts.createCallBinding = createCallBinding;
     function inlineExpressions(expressions) {
+        // Avoid deeply nested comma expressions as traversing them during emit can result in "Maximum call
+        // stack size exceeded" errors.
         return expressions.length > 10
             ? ts.createCommaList(expressions)
             : ts.reduceLeft(expressions, ts.createComma);
@@ -48189,14 +58218,14 @@ var ts;
     ts.createExpressionForPropertyName = createExpressionForPropertyName;
     function createExpressionForObjectLiteralElementLike(node, property, receiver) {
         switch (property.kind) {
-            case 156:
-            case 157:
+            case 156 /* GetAccessor */:
+            case 157 /* SetAccessor */:
                 return createExpressionForAccessorDeclaration(node.properties, property, receiver, !!node.multiLine);
-            case 270:
+            case 270 /* PropertyAssignment */:
                 return createExpressionForPropertyAssignment(property, receiver);
-            case 271:
+            case 271 /* ShorthandPropertyAssignment */:
                 return createExpressionForShorthandPropertyAssignment(property, receiver);
-            case 154:
+            case 154 /* MethodDeclaration */:
                 return createExpressionForMethodDeclaration(property, receiver);
         }
     }
@@ -48206,14 +58235,24 @@ var ts;
         if (property === firstAccessor) {
             var properties_9 = [];
             if (getAccessor) {
-                var getterFunction = ts.createFunctionExpression(getAccessor.modifiers, undefined, undefined, undefined, getAccessor.parameters, undefined, getAccessor.body);
+                var getterFunction = ts.createFunctionExpression(getAccessor.modifiers, 
+                /*asteriskToken*/ undefined, 
+                /*name*/ undefined, 
+                /*typeParameters*/ undefined, getAccessor.parameters, 
+                /*type*/ undefined, getAccessor.body // TODO: GH#18217
+                );
                 ts.setTextRange(getterFunction, getAccessor);
                 ts.setOriginalNode(getterFunction, getAccessor);
                 var getter = ts.createPropertyAssignment("get", getterFunction);
                 properties_9.push(getter);
             }
             if (setAccessor) {
-                var setterFunction = ts.createFunctionExpression(setAccessor.modifiers, undefined, undefined, undefined, setAccessor.parameters, undefined, setAccessor.body);
+                var setterFunction = ts.createFunctionExpression(setAccessor.modifiers, 
+                /*asteriskToken*/ undefined, 
+                /*name*/ undefined, 
+                /*typeParameters*/ undefined, setAccessor.parameters, 
+                /*type*/ undefined, setAccessor.body // TODO: GH#18217
+                );
                 ts.setTextRange(setterFunction, setAccessor);
                 ts.setOriginalNode(setterFunction, setAccessor);
                 var setter = ts.createPropertyAssignment("set", setterFunction);
@@ -48221,48 +58260,108 @@ var ts;
             }
             properties_9.push(ts.createPropertyAssignment("enumerable", ts.createTrue()));
             properties_9.push(ts.createPropertyAssignment("configurable", ts.createTrue()));
-            var expression = ts.setTextRange(ts.createCall(ts.createPropertyAccess(ts.createIdentifier("Object"), "defineProperty"), undefined, [
+            var expression = ts.setTextRange(ts.createCall(ts.createPropertyAccess(ts.createIdentifier("Object"), "defineProperty"), 
+            /*typeArguments*/ undefined, [
                 receiver,
                 createExpressionForPropertyName(property.name),
                 ts.createObjectLiteral(properties_9, multiLine)
-            ]), firstAccessor);
+            ]), 
+            /*location*/ firstAccessor);
             return ts.aggregateTransformFlags(expression);
         }
         return undefined;
     }
     function createExpressionForPropertyAssignment(property, receiver) {
-        return ts.aggregateTransformFlags(ts.setOriginalNode(ts.setTextRange(ts.createAssignment(createMemberAccessForPropertyName(receiver, property.name, property.name), property.initializer), property), property));
+        return ts.aggregateTransformFlags(ts.setOriginalNode(ts.setTextRange(ts.createAssignment(createMemberAccessForPropertyName(receiver, property.name, /*location*/ property.name), property.initializer), property), property));
     }
     function createExpressionForShorthandPropertyAssignment(property, receiver) {
-        return ts.aggregateTransformFlags(ts.setOriginalNode(ts.setTextRange(ts.createAssignment(createMemberAccessForPropertyName(receiver, property.name, property.name), ts.getSynthesizedClone(property.name)), property), property));
+        return ts.aggregateTransformFlags(ts.setOriginalNode(ts.setTextRange(ts.createAssignment(createMemberAccessForPropertyName(receiver, property.name, /*location*/ property.name), ts.getSynthesizedClone(property.name)), 
+        /*location*/ property), 
+        /*original*/ property));
     }
     function createExpressionForMethodDeclaration(method, receiver) {
-        return ts.aggregateTransformFlags(ts.setOriginalNode(ts.setTextRange(ts.createAssignment(createMemberAccessForPropertyName(receiver, method.name, method.name), ts.setOriginalNode(ts.setTextRange(ts.createFunctionExpression(method.modifiers, method.asteriskToken, undefined, undefined, method.parameters, undefined, method.body), method), method)), method), method));
+        return ts.aggregateTransformFlags(ts.setOriginalNode(ts.setTextRange(ts.createAssignment(createMemberAccessForPropertyName(receiver, method.name, /*location*/ method.name), ts.setOriginalNode(ts.setTextRange(ts.createFunctionExpression(method.modifiers, method.asteriskToken, 
+        /*name*/ undefined, 
+        /*typeParameters*/ undefined, method.parameters, 
+        /*type*/ undefined, method.body // TODO: GH#18217
+        ), 
+        /*location*/ method), 
+        /*original*/ method)), 
+        /*location*/ method), 
+        /*original*/ method));
     }
+    /**
+     * Gets the internal name of a declaration. This is primarily used for declarations that can be
+     * referred to by name in the body of an ES5 class function body. An internal name will *never*
+     * be prefixed with an module or namespace export modifier like "exports." when emitted as an
+     * expression. An internal name will also *never* be renamed due to a collision with a block
+     * scoped variable.
+     *
+     * @param node The declaration.
+     * @param allowComments A value indicating whether comments may be emitted for the name.
+     * @param allowSourceMaps A value indicating whether source maps may be emitted for the name.
+     */
     function getInternalName(node, allowComments, allowSourceMaps) {
-        return getName(node, allowComments, allowSourceMaps, 16384 | 32768);
+        return getName(node, allowComments, allowSourceMaps, 16384 /* LocalName */ | 32768 /* InternalName */);
     }
     ts.getInternalName = getInternalName;
+    /**
+     * Gets whether an identifier should only be referred to by its internal name.
+     */
     function isInternalName(node) {
-        return (ts.getEmitFlags(node) & 32768) !== 0;
+        return (ts.getEmitFlags(node) & 32768 /* InternalName */) !== 0;
     }
     ts.isInternalName = isInternalName;
+    /**
+     * Gets the local name of a declaration. This is primarily used for declarations that can be
+     * referred to by name in the declaration's immediate scope (classes, enums, namespaces). A
+     * local name will *never* be prefixed with an module or namespace export modifier like
+     * "exports." when emitted as an expression.
+     *
+     * @param node The declaration.
+     * @param allowComments A value indicating whether comments may be emitted for the name.
+     * @param allowSourceMaps A value indicating whether source maps may be emitted for the name.
+     */
     function getLocalName(node, allowComments, allowSourceMaps) {
-        return getName(node, allowComments, allowSourceMaps, 16384);
+        return getName(node, allowComments, allowSourceMaps, 16384 /* LocalName */);
     }
     ts.getLocalName = getLocalName;
+    /**
+     * Gets whether an identifier should only be referred to by its local name.
+     */
     function isLocalName(node) {
-        return (ts.getEmitFlags(node) & 16384) !== 0;
+        return (ts.getEmitFlags(node) & 16384 /* LocalName */) !== 0;
     }
     ts.isLocalName = isLocalName;
+    /**
+     * Gets the export name of a declaration. This is primarily used for declarations that can be
+     * referred to by name in the declaration's immediate scope (classes, enums, namespaces). An
+     * export name will *always* be prefixed with an module or namespace export modifier like
+     * `"exports."` when emitted as an expression if the name points to an exported symbol.
+     *
+     * @param node The declaration.
+     * @param allowComments A value indicating whether comments may be emitted for the name.
+     * @param allowSourceMaps A value indicating whether source maps may be emitted for the name.
+     */
     function getExportName(node, allowComments, allowSourceMaps) {
-        return getName(node, allowComments, allowSourceMaps, 8192);
+        return getName(node, allowComments, allowSourceMaps, 8192 /* ExportName */);
     }
     ts.getExportName = getExportName;
+    /**
+     * Gets whether an identifier should only be referred to by its export representation if the
+     * name points to an exported symbol.
+     */
     function isExportName(node) {
-        return (ts.getEmitFlags(node) & 8192) !== 0;
+        return (ts.getEmitFlags(node) & 8192 /* ExportName */) !== 0;
     }
     ts.isExportName = isExportName;
+    /**
+     * Gets the name of a declaration for use in declarations.
+     *
+     * @param node The declaration.
+     * @param allowComments A value indicating whether comments may be emitted for the name.
+     * @param allowSourceMaps A value indicating whether source maps may be emitted for the name.
+     */
     function getDeclarationName(node, allowComments, allowSourceMaps) {
         return getName(node, allowComments, allowSourceMaps);
     }
@@ -48274,30 +58373,49 @@ var ts;
             var name = ts.getMutableClone(nodeName);
             emitFlags |= ts.getEmitFlags(nodeName);
             if (!allowSourceMaps)
-                emitFlags |= 48;
+                emitFlags |= 48 /* NoSourceMap */;
             if (!allowComments)
-                emitFlags |= 1536;
+                emitFlags |= 1536 /* NoComments */;
             if (emitFlags)
                 ts.setEmitFlags(name, emitFlags);
             return name;
         }
         return ts.getGeneratedNameForNode(node);
     }
+    /**
+     * Gets the exported name of a declaration for use in expressions.
+     *
+     * An exported name will *always* be prefixed with an module or namespace export modifier like
+     * "exports." if the name points to an exported symbol.
+     *
+     * @param ns The namespace identifier.
+     * @param node The declaration.
+     * @param allowComments A value indicating whether comments may be emitted for the name.
+     * @param allowSourceMaps A value indicating whether source maps may be emitted for the name.
+     */
     function getExternalModuleOrNamespaceExportName(ns, node, allowComments, allowSourceMaps) {
-        if (ns && ts.hasModifier(node, 1)) {
+        if (ns && ts.hasModifier(node, 1 /* Export */)) {
             return getNamespaceMemberName(ns, getName(node), allowComments, allowSourceMaps);
         }
         return getExportName(node, allowComments, allowSourceMaps);
     }
     ts.getExternalModuleOrNamespaceExportName = getExternalModuleOrNamespaceExportName;
+    /**
+     * Gets a namespace-qualified name for use in expressions.
+     *
+     * @param ns The namespace identifier.
+     * @param name The name.
+     * @param allowComments A value indicating whether comments may be emitted for the name.
+     * @param allowSourceMaps A value indicating whether source maps may be emitted for the name.
+     */
     function getNamespaceMemberName(ns, name, allowComments, allowSourceMaps) {
         var qualifiedName = ts.createPropertyAccess(ns, ts.nodeIsSynthesized(name) ? name : ts.getSynthesizedClone(name));
         ts.setTextRange(qualifiedName, name);
         var emitFlags = 0;
         if (!allowSourceMaps)
-            emitFlags |= 48;
+            emitFlags |= 48 /* NoSourceMap */;
         if (!allowComments)
-            emitFlags |= 1536;
+            emitFlags |= 1536 /* NoComments */;
         if (emitFlags)
             ts.setEmitFlags(qualifiedName, emitFlags);
         return qualifiedName;
@@ -48314,7 +58432,7 @@ var ts;
         ts.setOriginalNode(updated, node);
         ts.setTextRange(updated, node);
         if (ts.getStartsOnNewLine(node)) {
-            ts.setStartsOnNewLine(updated, true);
+            ts.setStartsOnNewLine(updated, /*newLine*/ true);
         }
         ts.aggregateTransformFlags(updated);
         return updated;
@@ -48323,11 +58441,28 @@ var ts;
     function isUseStrictPrologue(node) {
         return ts.isStringLiteral(node.expression) && node.expression.text === "use strict";
     }
+    /**
+     * Add any necessary prologue-directives into target statement-array.
+     * The function needs to be called during each transformation step.
+     * This function needs to be called whenever we transform the statement
+     * list of a source file, namespace, or function-like body.
+     *
+     * @param target: result statements array
+     * @param source: origin statements array
+     * @param ensureUseStrict: boolean determining whether the function need to add prologue-directives
+     * @param visitor: Optional callback used to visit any custom prologue directives.
+     */
     function addPrologue(target, source, ensureUseStrict, visitor) {
         var offset = addStandardPrologue(target, source, ensureUseStrict);
         return addCustomPrologue(target, source, offset, visitor);
     }
     ts.addPrologue = addPrologue;
+    /**
+     * Add just the standard (string-expression) prologue-directives into target statement-array.
+     * The function needs to be called during each transformation step.
+     * This function needs to be called whenever we transform the statement
+     * list of a source file, namespace, or function-like body.
+     */
     function addStandardPrologue(target, source, ensureUseStrict) {
         ts.Debug.assert(target.length === 0, "Prologue directives should be at the first statement in the target statements array");
         var foundUseStrict = false;
@@ -48356,7 +58491,7 @@ var ts;
         var numStatements = source.length;
         while (statementOffset !== undefined && statementOffset < numStatements) {
             var statement = source[statementOffset];
-            if (ts.getEmitFlags(statement) & 1048576) {
+            if (ts.getEmitFlags(statement) & 1048576 /* CustomPrologue */) {
                 ts.append(target, visitor ? ts.visitNode(statement, visitor, ts.isStatement) : statement);
             }
             else {
@@ -48374,6 +58509,11 @@ var ts;
             && isUseStrictPrologue(firstStatement);
     }
     ts.startsWithUseStrict = startsWithUseStrict;
+    /**
+     * Ensures "use strict" directive is added
+     *
+     * @param statements An array of statements
+     */
     function ensureUseStrict(statements) {
         var foundUseStrict = false;
         for (var _i = 0, statements_3 = statements; _i < statements_3.length; _i++) {
@@ -48396,9 +58536,19 @@ var ts;
         return statements;
     }
     ts.ensureUseStrict = ensureUseStrict;
+    /**
+     * Wraps the operand to a BinaryExpression in parentheses if they are needed to preserve the intended
+     * order of operations.
+     *
+     * @param binaryOperator The operator for the BinaryExpression.
+     * @param operand The operand for the BinaryExpression.
+     * @param isLeftSideOfBinary A value indicating whether the operand is the left side of the
+     *                           BinaryExpression.
+     */
     function parenthesizeBinaryOperand(binaryOperator, operand, isLeftSideOfBinary, leftOperand) {
         var skipped = ts.skipPartiallyEmittedExpressions(operand);
-        if (skipped.kind === 191) {
+        // If the resulting expression is already parenthesized, we do not need to do any further processing.
+        if (skipped.kind === 191 /* ParenthesizedExpression */) {
             return operand;
         }
         return binaryOperandNeedsParentheses(binaryOperator, operand, isLeftSideOfBinary, leftOperand)
@@ -48406,55 +58556,131 @@ var ts;
             : operand;
     }
     ts.parenthesizeBinaryOperand = parenthesizeBinaryOperand;
+    /**
+     * Determines whether the operand to a BinaryExpression needs to be parenthesized.
+     *
+     * @param binaryOperator The operator for the BinaryExpression.
+     * @param operand The operand for the BinaryExpression.
+     * @param isLeftSideOfBinary A value indicating whether the operand is the left side of the
+     *                           BinaryExpression.
+     */
     function binaryOperandNeedsParentheses(binaryOperator, operand, isLeftSideOfBinary, leftOperand) {
-        var binaryOperatorPrecedence = ts.getOperatorPrecedence(200, binaryOperator);
-        var binaryOperatorAssociativity = ts.getOperatorAssociativity(200, binaryOperator);
+        // If the operand has lower precedence, then it needs to be parenthesized to preserve the
+        // intent of the expression. For example, if the operand is `a + b` and the operator is
+        // `*`, then we need to parenthesize the operand to preserve the intended order of
+        // operations: `(a + b) * x`.
+        //
+        // If the operand has higher precedence, then it does not need to be parenthesized. For
+        // example, if the operand is `a * b` and the operator is `+`, then we do not need to
+        // parenthesize to preserve the intended order of operations: `a * b + x`.
+        //
+        // If the operand has the same precedence, then we need to check the associativity of
+        // the operator based on whether this is the left or right operand of the expression.
+        //
+        // For example, if `a / d` is on the right of operator `*`, we need to parenthesize
+        // to preserve the intended order of operations: `x * (a / d)`
+        //
+        // If `a ** d` is on the left of operator `**`, we need to parenthesize to preserve
+        // the intended order of operations: `(a ** b) ** c`
+        var binaryOperatorPrecedence = ts.getOperatorPrecedence(200 /* BinaryExpression */, binaryOperator);
+        var binaryOperatorAssociativity = ts.getOperatorAssociativity(200 /* BinaryExpression */, binaryOperator);
         var emittedOperand = ts.skipPartiallyEmittedExpressions(operand);
         var operandPrecedence = ts.getExpressionPrecedence(emittedOperand);
         switch (ts.compareValues(operandPrecedence, binaryOperatorPrecedence)) {
-            case -1:
+            case -1 /* LessThan */:
+                // If the operand is the right side of a right-associative binary operation
+                // and is a yield expression, then we do not need parentheses.
                 if (!isLeftSideOfBinary
-                    && binaryOperatorAssociativity === 1
-                    && operand.kind === 203) {
+                    && binaryOperatorAssociativity === 1 /* Right */
+                    && operand.kind === 203 /* YieldExpression */) {
                     return false;
                 }
                 return true;
-            case 1:
+            case 1 /* GreaterThan */:
                 return false;
-            case 0:
+            case 0 /* EqualTo */:
                 if (isLeftSideOfBinary) {
-                    return binaryOperatorAssociativity === 1;
+                    // No need to parenthesize the left operand when the binary operator is
+                    // left associative:
+                    //  (a*b)/x    -> a*b/x
+                    //  (a**b)/x   -> a**b/x
+                    //
+                    // Parentheses are needed for the left operand when the binary operator is
+                    // right associative:
+                    //  (a/b)**x   -> (a/b)**x
+                    //  (a**b)**x  -> (a**b)**x
+                    return binaryOperatorAssociativity === 1 /* Right */;
                 }
                 else {
                     if (ts.isBinaryExpression(emittedOperand)
                         && emittedOperand.operatorToken.kind === binaryOperator) {
+                        // No need to parenthesize the right operand when the binary operator and
+                        // operand are the same and one of the following:
+                        //  x*(a*b)     => x*a*b
+                        //  x|(a|b)     => x|a|b
+                        //  x&(a&b)     => x&a&b
+                        //  x^(a^b)     => x^a^b
                         if (operatorHasAssociativeProperty(binaryOperator)) {
                             return false;
                         }
-                        if (binaryOperator === 37) {
-                            var leftKind = leftOperand ? getLiteralKindOfBinaryPlusOperand(leftOperand) : 0;
+                        // No need to parenthesize the right operand when the binary operator
+                        // is plus (+) if both the left and right operands consist solely of either
+                        // literals of the same kind or binary plus (+) expressions for literals of
+                        // the same kind (recursively).
+                        //  "a"+(1+2)       => "a"+(1+2)
+                        //  "a"+("b"+"c")   => "a"+"b"+"c"
+                        if (binaryOperator === 37 /* PlusToken */) {
+                            var leftKind = leftOperand ? getLiteralKindOfBinaryPlusOperand(leftOperand) : 0 /* Unknown */;
                             if (ts.isLiteralKind(leftKind) && leftKind === getLiteralKindOfBinaryPlusOperand(emittedOperand)) {
                                 return false;
                             }
                         }
                     }
+                    // No need to parenthesize the right operand when the operand is right
+                    // associative:
+                    //  x/(a**b)    -> x/a**b
+                    //  x**(a**b)   -> x**a**b
+                    //
+                    // Parentheses are needed for the right operand when the operand is left
+                    // associative:
+                    //  x/(a*b)     -> x/(a*b)
+                    //  x**(a/b)    -> x**(a/b)
                     var operandAssociativity = ts.getExpressionAssociativity(emittedOperand);
-                    return operandAssociativity === 0;
+                    return operandAssociativity === 0 /* Left */;
                 }
         }
     }
+    /**
+     * Determines whether a binary operator is mathematically associative.
+     *
+     * @param binaryOperator The binary operator.
+     */
     function operatorHasAssociativeProperty(binaryOperator) {
-        return binaryOperator === 39
-            || binaryOperator === 49
-            || binaryOperator === 48
-            || binaryOperator === 50;
+        // The following operators are associative in JavaScript:
+        //  (a*b)*c     -> a*(b*c)  -> a*b*c
+        //  (a|b)|c     -> a|(b|c)  -> a|b|c
+        //  (a&b)&c     -> a&(b&c)  -> a&b&c
+        //  (a^b)^c     -> a^(b^c)  -> a^b^c
+        //
+        // While addition is associative in mathematics, JavaScript's `+` is not
+        // guaranteed to be associative as it is overloaded with string concatenation.
+        return binaryOperator === 39 /* AsteriskToken */
+            || binaryOperator === 49 /* BarToken */
+            || binaryOperator === 48 /* AmpersandToken */
+            || binaryOperator === 50 /* CaretToken */;
     }
+    /**
+     * This function determines whether an expression consists of a homogeneous set of
+     * literal expressions or binary plus expressions that all share the same literal kind.
+     * It is used to determine whether the right-hand operand of a binary plus expression can be
+     * emitted without parentheses.
+     */
     function getLiteralKindOfBinaryPlusOperand(node) {
         node = ts.skipPartiallyEmittedExpressions(node);
         if (ts.isLiteralKind(node.kind)) {
             return node.kind;
         }
-        if (node.kind === 200 && node.operatorToken.kind === 37) {
+        if (node.kind === 200 /* BinaryExpression */ && node.operatorToken.kind === 37 /* PlusToken */) {
             if (node.cachedLiteralKind !== undefined) {
                 return node.cachedLiteralKind;
             }
@@ -48462,46 +58688,66 @@ var ts;
             var literalKind = ts.isLiteralKind(leftKind)
                 && leftKind === getLiteralKindOfBinaryPlusOperand(node.right)
                 ? leftKind
-                : 0;
+                : 0 /* Unknown */;
             node.cachedLiteralKind = literalKind;
             return literalKind;
         }
-        return 0;
+        return 0 /* Unknown */;
     }
     function parenthesizeForConditionalHead(condition) {
-        var conditionalPrecedence = ts.getOperatorPrecedence(201, 55);
+        var conditionalPrecedence = ts.getOperatorPrecedence(201 /* ConditionalExpression */, 55 /* QuestionToken */);
         var emittedCondition = ts.skipPartiallyEmittedExpressions(condition);
         var conditionPrecedence = ts.getExpressionPrecedence(emittedCondition);
-        if (ts.compareValues(conditionPrecedence, conditionalPrecedence) === -1) {
+        if (ts.compareValues(conditionPrecedence, conditionalPrecedence) === -1 /* LessThan */) {
             return ts.createParen(condition);
         }
         return condition;
     }
     ts.parenthesizeForConditionalHead = parenthesizeForConditionalHead;
     function parenthesizeSubexpressionOfConditionalExpression(e) {
+        // per ES grammar both 'whenTrue' and 'whenFalse' parts of conditional expression are assignment expressions
+        // so in case when comma expression is introduced as a part of previous transformations
+        // if should be wrapped in parens since comma operator has the lowest precedence
         var emittedExpression = ts.skipPartiallyEmittedExpressions(e);
-        return emittedExpression.kind === 200 && emittedExpression.operatorToken.kind === 26 ||
-            emittedExpression.kind === 302
+        return emittedExpression.kind === 200 /* BinaryExpression */ && emittedExpression.operatorToken.kind === 26 /* CommaToken */ ||
+            emittedExpression.kind === 302 /* CommaListExpression */
             ? ts.createParen(e)
             : e;
     }
     ts.parenthesizeSubexpressionOfConditionalExpression = parenthesizeSubexpressionOfConditionalExpression;
+    /**
+     *  [Per the spec](https://tc39.github.io/ecma262/#prod-ExportDeclaration), `export default` accepts _AssigmentExpression_ but
+     *  has a lookahead restriction for `function`, `async function`, and `class`.
+     *
+     * Basically, that means we need to parenthesize in the following cases:
+     *
+     * - BinaryExpression of CommaToken
+     * - CommaList (synthetic list of multiple comma expressions)
+     * - FunctionExpression
+     * - ClassExpression
+     */
     function parenthesizeDefaultExpression(e) {
         var check = ts.skipPartiallyEmittedExpressions(e);
-        return (check.kind === 205 ||
-            check.kind === 192 ||
-            check.kind === 302 ||
-            ts.isBinaryExpression(check) && check.operatorToken.kind === 26)
+        return (check.kind === 205 /* ClassExpression */ ||
+            check.kind === 192 /* FunctionExpression */ ||
+            check.kind === 302 /* CommaListExpression */ ||
+            ts.isBinaryExpression(check) && check.operatorToken.kind === 26 /* CommaToken */)
             ? ts.createParen(e)
             : e;
     }
     ts.parenthesizeDefaultExpression = parenthesizeDefaultExpression;
+    /**
+     * Wraps an expression in parentheses if it is needed in order to use the expression
+     * as the expression of a NewExpression node.
+     *
+     * @param expression The Expression node.
+     */
     function parenthesizeForNew(expression) {
-        var leftmostExpr = getLeftmostExpression(expression, true);
+        var leftmostExpr = getLeftmostExpression(expression, /*stopAtCallExpressions*/ true);
         switch (leftmostExpr.kind) {
-            case 187:
+            case 187 /* CallExpression */:
                 return ts.createParen(expression);
-            case 188:
+            case 188 /* NewExpression */:
                 return !leftmostExpr.arguments
                     ? ts.createParen(expression)
                     : expression;
@@ -48509,10 +58755,22 @@ var ts;
         return parenthesizeForAccess(expression);
     }
     ts.parenthesizeForNew = parenthesizeForNew;
+    /**
+     * Wraps an expression in parentheses if it is needed in order to use the expression for
+     * property or element access.
+     *
+     * @param expr The expression node.
+     */
     function parenthesizeForAccess(expression) {
+        // isLeftHandSideExpression is almost the correct criterion for when it is not necessary
+        // to parenthesize the expression before a dot. The known exception is:
+        //
+        //    NewExpression:
+        //       new C.x        -> not the same as (new C).x
+        //
         var emittedExpression = ts.skipPartiallyEmittedExpressions(expression);
         if (ts.isLeftHandSideExpression(emittedExpression)
-            && (emittedExpression.kind !== 188 || emittedExpression.arguments)) {
+            && (emittedExpression.kind !== 188 /* NewExpression */ || emittedExpression.arguments)) {
             return expression;
         }
         return ts.setTextRange(ts.createParen(expression), expression);
@@ -48550,7 +58808,7 @@ var ts;
     function parenthesizeExpressionForList(expression) {
         var emittedExpression = ts.skipPartiallyEmittedExpressions(expression);
         var expressionPrecedence = ts.getExpressionPrecedence(emittedExpression);
-        var commaPrecedence = ts.getOperatorPrecedence(200, 26);
+        var commaPrecedence = ts.getOperatorPrecedence(200 /* BinaryExpression */, 26 /* CommaToken */);
         return expressionPrecedence > commaPrecedence
             ? expression
             : ts.setTextRange(ts.createParen(expression), expression);
@@ -48561,29 +58819,29 @@ var ts;
         if (ts.isCallExpression(emittedExpression)) {
             var callee = emittedExpression.expression;
             var kind = ts.skipPartiallyEmittedExpressions(callee).kind;
-            if (kind === 192 || kind === 193) {
+            if (kind === 192 /* FunctionExpression */ || kind === 193 /* ArrowFunction */) {
                 var mutableCall = ts.getMutableClone(emittedExpression);
                 mutableCall.expression = ts.setTextRange(ts.createParen(callee), callee);
-                return recreateOuterExpressions(expression, mutableCall, 4);
+                return recreateOuterExpressions(expression, mutableCall, 4 /* PartiallyEmittedExpressions */);
             }
         }
-        var leftmostExpressionKind = getLeftmostExpression(emittedExpression, false).kind;
-        if (leftmostExpressionKind === 184 || leftmostExpressionKind === 192) {
+        var leftmostExpressionKind = getLeftmostExpression(emittedExpression, /*stopAtCallExpressions*/ false).kind;
+        if (leftmostExpressionKind === 184 /* ObjectLiteralExpression */ || leftmostExpressionKind === 192 /* FunctionExpression */) {
             return ts.setTextRange(ts.createParen(expression), expression);
         }
         return expression;
     }
     ts.parenthesizeExpressionForExpressionStatement = parenthesizeExpressionForExpressionStatement;
     function parenthesizeConditionalTypeMember(member) {
-        return member.kind === 171 ? ts.createParenthesizedType(member) : member;
+        return member.kind === 171 /* ConditionalType */ ? ts.createParenthesizedType(member) : member;
     }
     ts.parenthesizeConditionalTypeMember = parenthesizeConditionalTypeMember;
     function parenthesizeElementTypeMember(member) {
         switch (member.kind) {
-            case 169:
-            case 170:
-            case 163:
-            case 164:
+            case 169 /* UnionType */:
+            case 170 /* IntersectionType */:
+            case 163 /* FunctionType */:
+            case 164 /* ConstructorType */:
                 return ts.createParenthesizedType(member);
         }
         return parenthesizeConditionalTypeMember(member);
@@ -48591,9 +58849,9 @@ var ts;
     ts.parenthesizeElementTypeMember = parenthesizeElementTypeMember;
     function parenthesizeArrayTypeMember(member) {
         switch (member.kind) {
-            case 165:
-            case 175:
-            case 172:
+            case 165 /* TypeQuery */:
+            case 175 /* TypeOperator */:
+            case 172 /* InferType */:
                 return ts.createParenthesizedType(member);
         }
         return parenthesizeElementTypeMember(member);
@@ -48619,24 +58877,25 @@ var ts;
     function getLeftmostExpression(node, stopAtCallExpressions) {
         while (true) {
             switch (node.kind) {
-                case 199:
+                case 199 /* PostfixUnaryExpression */:
                     node = node.operand;
                     continue;
-                case 200:
+                case 200 /* BinaryExpression */:
                     node = node.left;
                     continue;
-                case 201:
+                case 201 /* ConditionalExpression */:
                     node = node.condition;
                     continue;
-                case 187:
+                case 187 /* CallExpression */:
                     if (stopAtCallExpressions) {
                         return node;
                     }
-                case 186:
-                case 185:
+                // falls through
+                case 186 /* ElementAccessExpression */:
+                case 185 /* PropertyAccessExpression */:
                     node = node.expression;
                     continue;
-                case 301:
+                case 301 /* PartiallyEmittedExpression */:
                     node = node.expression;
                     continue;
             }
@@ -48644,7 +58903,7 @@ var ts;
         }
     }
     function parenthesizeConciseBody(body) {
-        if (!ts.isBlock(body) && getLeftmostExpression(body, false).kind === 184) {
+        if (!ts.isBlock(body) && getLeftmostExpression(body, /*stopAtCallExpressions*/ false).kind === 184 /* ObjectLiteralExpression */) {
             return ts.setTextRange(ts.createParen(body), body);
         }
         return body;
@@ -48658,32 +58917,32 @@ var ts;
         OuterExpressionKinds[OuterExpressionKinds["All"] = 7] = "All";
     })(OuterExpressionKinds = ts.OuterExpressionKinds || (ts.OuterExpressionKinds = {}));
     function isOuterExpression(node, kinds) {
-        if (kinds === void 0) { kinds = 7; }
+        if (kinds === void 0) { kinds = 7 /* All */; }
         switch (node.kind) {
-            case 191:
-                return (kinds & 1) !== 0;
-            case 190:
-            case 208:
-            case 209:
-                return (kinds & 2) !== 0;
-            case 301:
-                return (kinds & 4) !== 0;
+            case 191 /* ParenthesizedExpression */:
+                return (kinds & 1 /* Parentheses */) !== 0;
+            case 190 /* TypeAssertionExpression */:
+            case 208 /* AsExpression */:
+            case 209 /* NonNullExpression */:
+                return (kinds & 2 /* Assertions */) !== 0;
+            case 301 /* PartiallyEmittedExpression */:
+                return (kinds & 4 /* PartiallyEmittedExpressions */) !== 0;
         }
         return false;
     }
     ts.isOuterExpression = isOuterExpression;
     function skipOuterExpressions(node, kinds) {
-        if (kinds === void 0) { kinds = 7; }
+        if (kinds === void 0) { kinds = 7 /* All */; }
         var previousNode;
         do {
             previousNode = node;
-            if (kinds & 1) {
+            if (kinds & 1 /* Parentheses */) {
                 node = ts.skipParentheses(node);
             }
-            if (kinds & 2) {
+            if (kinds & 2 /* Assertions */) {
                 node = skipAssertions(node);
             }
-            if (kinds & 4) {
+            if (kinds & 4 /* PartiallyEmittedExpressions */) {
                 node = ts.skipPartiallyEmittedExpressions(node);
             }
         } while (previousNode !== node);
@@ -48691,7 +58950,7 @@ var ts;
     }
     ts.skipOuterExpressions = skipOuterExpressions;
     function skipAssertions(node) {
-        while (ts.isAssertionExpression(node) || node.kind === 209) {
+        while (ts.isAssertionExpression(node) || node.kind === 209 /* NonNullExpression */) {
             node = node.expression;
         }
         return node;
@@ -48699,15 +58958,29 @@ var ts;
     ts.skipAssertions = skipAssertions;
     function updateOuterExpression(outerExpression, expression) {
         switch (outerExpression.kind) {
-            case 191: return ts.updateParen(outerExpression, expression);
-            case 190: return ts.updateTypeAssertion(outerExpression, outerExpression.type, expression);
-            case 208: return ts.updateAsExpression(outerExpression, expression, outerExpression.type);
-            case 209: return ts.updateNonNullExpression(outerExpression, expression);
-            case 301: return ts.updatePartiallyEmittedExpression(outerExpression, expression);
+            case 191 /* ParenthesizedExpression */: return ts.updateParen(outerExpression, expression);
+            case 190 /* TypeAssertionExpression */: return ts.updateTypeAssertion(outerExpression, outerExpression.type, expression);
+            case 208 /* AsExpression */: return ts.updateAsExpression(outerExpression, expression, outerExpression.type);
+            case 209 /* NonNullExpression */: return ts.updateNonNullExpression(outerExpression, expression);
+            case 301 /* PartiallyEmittedExpression */: return ts.updatePartiallyEmittedExpression(outerExpression, expression);
         }
     }
+    /**
+     * Determines whether a node is a parenthesized expression that can be ignored when recreating outer expressions.
+     *
+     * A parenthesized expression can be ignored when all of the following are true:
+     *
+     * - It's `pos` and `end` are not -1
+     * - It does not have a custom source map range
+     * - It does not have a custom comment range
+     * - It does not have synthetic leading or trailing comments
+     *
+     * If an outermost parenthesized expression is ignored, but the containing expression requires a parentheses around
+     * the expression to maintain precedence, a new parenthesized expression should be created automatically when
+     * the containing expression is created/updated.
+     */
     function isIgnorableParen(node) {
-        return node.kind === 191
+        return node.kind === 191 /* ParenthesizedExpression */
             && ts.nodeIsSynthesized(node)
             && ts.nodeIsSynthesized(ts.getSourceMapRange(node))
             && ts.nodeIsSynthesized(ts.getCommentRange(node))
@@ -48715,7 +58988,7 @@ var ts;
             && !ts.some(ts.getSyntheticTrailingComments(node));
     }
     function recreateOuterExpressions(outerExpression, innerExpression, kinds) {
-        if (kinds === void 0) { kinds = 7; }
+        if (kinds === void 0) { kinds = 7 /* All */; }
         if (outerExpression && isOuterExpression(outerExpression, kinds) && !isIgnorableParen(outerExpression)) {
             return updateOuterExpression(outerExpression, recreateOuterExpressions(outerExpression.expression, innerExpression));
         }
@@ -48723,7 +58996,7 @@ var ts;
     }
     ts.recreateOuterExpressions = recreateOuterExpressions;
     function startOnNewLine(node) {
-        return ts.setStartsOnNewLine(node, true);
+        return ts.setStartsOnNewLine(node, /*newLine*/ true);
     }
     ts.startOnNewLine = startOnNewLine;
     function getExternalHelpersModuleName(node) {
@@ -48763,24 +59036,35 @@ var ts;
         }
     }
     ts.getOrCreateExternalHelpersModuleNameIfNeeded = getOrCreateExternalHelpersModuleNameIfNeeded;
+    /**
+     * Get the name of that target module from an import or export declaration
+     */
     function getLocalNameForExternalImport(node, sourceFile) {
         var namespaceDeclaration = ts.getNamespaceDeclarationNode(node);
         if (namespaceDeclaration && !ts.isDefaultImport(node)) {
             var name = namespaceDeclaration.name;
             return ts.isGeneratedIdentifier(name) ? name : ts.createIdentifier(ts.getSourceTextOfNodeFromSourceFile(sourceFile, name) || ts.idText(name));
         }
-        if (node.kind === 244 && node.importClause) {
+        if (node.kind === 244 /* ImportDeclaration */ && node.importClause) {
             return ts.getGeneratedNameForNode(node);
         }
-        if (node.kind === 250 && node.moduleSpecifier) {
+        if (node.kind === 250 /* ExportDeclaration */ && node.moduleSpecifier) {
             return ts.getGeneratedNameForNode(node);
         }
         return undefined;
     }
     ts.getLocalNameForExternalImport = getLocalNameForExternalImport;
+    /**
+     * Get the name of a target module from an import/export declaration as should be written in the emitted output.
+     * The emitted output name can be different from the input if:
+     *  1. The module has a /// <amd-module name="<new name>" />
+     *  2. --out or --outFile is used, making the name relative to the rootDir
+     *  3- The containing SourceFile has an entry in renamedDependencies for the import as requested by some module loaders (e.g. System).
+     * Otherwise, a new StringLiteral node representing the module name will be returned.
+     */
     function getExternalModuleNameLiteral(importNode, sourceFile, host, resolver, compilerOptions) {
-        var moduleName = ts.getExternalModuleName(importNode);
-        if (moduleName.kind === 9) {
+        var moduleName = ts.getExternalModuleName(importNode); // TODO: GH#18217
+        if (moduleName.kind === 9 /* StringLiteral */) {
             return tryGetModuleNameFromDeclaration(importNode, host, resolver, compilerOptions)
                 || tryRenameExternalModule(moduleName, sourceFile)
                 || ts.getSynthesizedClone(moduleName);
@@ -48788,10 +59072,21 @@ var ts;
         return undefined;
     }
     ts.getExternalModuleNameLiteral = getExternalModuleNameLiteral;
+    /**
+     * Some bundlers (SystemJS builder) sometimes want to rename dependencies.
+     * Here we check if alternative name was provided for a given moduleName and return it if possible.
+     */
     function tryRenameExternalModule(moduleName, sourceFile) {
         var rename = sourceFile.renamedDependencies && sourceFile.renamedDependencies.get(moduleName.text);
         return rename && ts.createLiteral(rename);
     }
+    /**
+     * Get the name of a module as should be written in the emitted output.
+     * The emitted output name can be different from the input if:
+     *  1. The module has a /// <amd-module name="<new name>" />
+     *  2. --out or --outFile is used, making the name relative to the rootDir
+     * Otherwise, a new StringLiteral node representing the module name will be returned.
+     */
     function tryGetModuleNameFromFile(file, host, options) {
         if (!file) {
             return undefined;
@@ -48808,66 +59103,140 @@ var ts;
     function tryGetModuleNameFromDeclaration(declaration, host, resolver, compilerOptions) {
         return tryGetModuleNameFromFile(resolver.getExternalModuleFileFromDeclaration(declaration), host, compilerOptions);
     }
+    /**
+     * Gets the initializer of an BindingOrAssignmentElement.
+     */
     function getInitializerOfBindingOrAssignmentElement(bindingElement) {
         if (ts.isDeclarationBindingElement(bindingElement)) {
+            // `1` in `let { a = 1 } = ...`
+            // `1` in `let { a: b = 1 } = ...`
+            // `1` in `let { a: {b} = 1 } = ...`
+            // `1` in `let { a: [b] = 1 } = ...`
+            // `1` in `let [a = 1] = ...`
+            // `1` in `let [{a} = 1] = ...`
+            // `1` in `let [[a] = 1] = ...`
             return bindingElement.initializer;
         }
         if (ts.isPropertyAssignment(bindingElement)) {
+            // `1` in `({ a: b = 1 } = ...)`
+            // `1` in `({ a: {b} = 1 } = ...)`
+            // `1` in `({ a: [b] = 1 } = ...)`
             var initializer = bindingElement.initializer;
-            return ts.isAssignmentExpression(initializer, true)
+            return ts.isAssignmentExpression(initializer, /*excludeCompoundAssignment*/ true)
                 ? initializer.right
                 : undefined;
         }
         if (ts.isShorthandPropertyAssignment(bindingElement)) {
+            // `1` in `({ a = 1 } = ...)`
             return bindingElement.objectAssignmentInitializer;
         }
-        if (ts.isAssignmentExpression(bindingElement, true)) {
+        if (ts.isAssignmentExpression(bindingElement, /*excludeCompoundAssignment*/ true)) {
+            // `1` in `[a = 1] = ...`
+            // `1` in `[{a} = 1] = ...`
+            // `1` in `[[a] = 1] = ...`
             return bindingElement.right;
         }
         if (ts.isSpreadElement(bindingElement)) {
+            // Recovery consistent with existing emit.
             return getInitializerOfBindingOrAssignmentElement(bindingElement.expression);
         }
     }
     ts.getInitializerOfBindingOrAssignmentElement = getInitializerOfBindingOrAssignmentElement;
+    /**
+     * Gets the name of an BindingOrAssignmentElement.
+     */
     function getTargetOfBindingOrAssignmentElement(bindingElement) {
         if (ts.isDeclarationBindingElement(bindingElement)) {
+            // `a` in `let { a } = ...`
+            // `a` in `let { a = 1 } = ...`
+            // `b` in `let { a: b } = ...`
+            // `b` in `let { a: b = 1 } = ...`
+            // `a` in `let { ...a } = ...`
+            // `{b}` in `let { a: {b} } = ...`
+            // `{b}` in `let { a: {b} = 1 } = ...`
+            // `[b]` in `let { a: [b] } = ...`
+            // `[b]` in `let { a: [b] = 1 } = ...`
+            // `a` in `let [a] = ...`
+            // `a` in `let [a = 1] = ...`
+            // `a` in `let [...a] = ...`
+            // `{a}` in `let [{a}] = ...`
+            // `{a}` in `let [{a} = 1] = ...`
+            // `[a]` in `let [[a]] = ...`
+            // `[a]` in `let [[a] = 1] = ...`
             return bindingElement.name;
         }
         if (ts.isObjectLiteralElementLike(bindingElement)) {
             switch (bindingElement.kind) {
-                case 270:
+                case 270 /* PropertyAssignment */:
+                    // `b` in `({ a: b } = ...)`
+                    // `b` in `({ a: b = 1 } = ...)`
+                    // `{b}` in `({ a: {b} } = ...)`
+                    // `{b}` in `({ a: {b} = 1 } = ...)`
+                    // `[b]` in `({ a: [b] } = ...)`
+                    // `[b]` in `({ a: [b] = 1 } = ...)`
+                    // `b.c` in `({ a: b.c } = ...)`
+                    // `b.c` in `({ a: b.c = 1 } = ...)`
+                    // `b[0]` in `({ a: b[0] } = ...)`
+                    // `b[0]` in `({ a: b[0] = 1 } = ...)`
                     return getTargetOfBindingOrAssignmentElement(bindingElement.initializer);
-                case 271:
+                case 271 /* ShorthandPropertyAssignment */:
+                    // `a` in `({ a } = ...)`
+                    // `a` in `({ a = 1 } = ...)`
                     return bindingElement.name;
-                case 272:
+                case 272 /* SpreadAssignment */:
+                    // `a` in `({ ...a } = ...)`
                     return getTargetOfBindingOrAssignmentElement(bindingElement.expression);
             }
+            // no target
             return undefined;
         }
-        if (ts.isAssignmentExpression(bindingElement, true)) {
+        if (ts.isAssignmentExpression(bindingElement, /*excludeCompoundAssignment*/ true)) {
+            // `a` in `[a = 1] = ...`
+            // `{a}` in `[{a} = 1] = ...`
+            // `[a]` in `[[a] = 1] = ...`
+            // `a.b` in `[a.b = 1] = ...`
+            // `a[0]` in `[a[0] = 1] = ...`
             return getTargetOfBindingOrAssignmentElement(bindingElement.left);
         }
         if (ts.isSpreadElement(bindingElement)) {
+            // `a` in `[...a] = ...`
             return getTargetOfBindingOrAssignmentElement(bindingElement.expression);
         }
+        // `a` in `[a] = ...`
+        // `{a}` in `[{a}] = ...`
+        // `[a]` in `[[a]] = ...`
+        // `a.b` in `[a.b] = ...`
+        // `a[0]` in `[a[0]] = ...`
         return bindingElement;
     }
     ts.getTargetOfBindingOrAssignmentElement = getTargetOfBindingOrAssignmentElement;
+    /**
+     * Determines whether an BindingOrAssignmentElement is a rest element.
+     */
     function getRestIndicatorOfBindingOrAssignmentElement(bindingElement) {
         switch (bindingElement.kind) {
-            case 149:
-            case 182:
+            case 149 /* Parameter */:
+            case 182 /* BindingElement */:
+                // `...` in `let [...a] = ...`
                 return bindingElement.dotDotDotToken;
-            case 204:
-            case 272:
+            case 204 /* SpreadElement */:
+            case 272 /* SpreadAssignment */:
+                // `...` in `[...a] = ...`
                 return bindingElement;
         }
         return undefined;
     }
     ts.getRestIndicatorOfBindingOrAssignmentElement = getRestIndicatorOfBindingOrAssignmentElement;
+    /**
+     * Gets the property name of a BindingOrAssignmentElement
+     */
     function getPropertyNameOfBindingOrAssignmentElement(bindingElement) {
         switch (bindingElement.kind) {
-            case 182:
+            case 182 /* BindingElement */:
+                // `a` in `let { a: b } = ...`
+                // `[a]` in `let { [a]: b } = ...`
+                // `"a"` in `let { "a": b } = ...`
+                // `1` in `let { 1: b } = ...`
                 if (bindingElement.propertyName) {
                     var propertyName = bindingElement.propertyName;
                     return ts.isComputedPropertyName(propertyName) && ts.isStringOrNumericLiteral(propertyName.expression)
@@ -48875,7 +59244,11 @@ var ts;
                         : propertyName;
                 }
                 break;
-            case 270:
+            case 270 /* PropertyAssignment */:
+                // `a` in `({ a: b } = ...)`
+                // `[a]` in `({ [a]: b } = ...)`
+                // `"a"` in `({ "a": b } = ...)`
+                // `1` in `({ 1: b } = ...)`
                 if (bindingElement.name) {
                     var propertyName = bindingElement.name;
                     return ts.isComputedPropertyName(propertyName) && ts.isStringOrNumericLiteral(propertyName.expression)
@@ -48883,7 +59256,8 @@ var ts;
                         : propertyName;
                 }
                 break;
-            case 272:
+            case 272 /* SpreadAssignment */:
+                // `a` in `({ ...a } = ...)`
                 return bindingElement.name;
         }
         var target = getTargetOfBindingOrAssignmentElement(bindingElement);
@@ -48895,13 +59269,19 @@ var ts;
         ts.Debug.fail("Invalid property name for binding element.");
     }
     ts.getPropertyNameOfBindingOrAssignmentElement = getPropertyNameOfBindingOrAssignmentElement;
+    /**
+     * Gets the elements of a BindingOrAssignmentPattern
+     */
     function getElementsOfBindingOrAssignmentPattern(name) {
         switch (name.kind) {
-            case 180:
-            case 181:
-            case 183:
+            case 180 /* ObjectBindingPattern */:
+            case 181 /* ArrayBindingPattern */:
+            case 183 /* ArrayLiteralExpression */:
+                // `a` in `{a}`
+                // `a` in `[a]`
                 return name.elements;
-            case 184:
+            case 184 /* ObjectLiteralExpression */:
+                // `a` in `{a}`
                 return name.properties;
         }
     }
@@ -48940,11 +59320,11 @@ var ts;
     ts.convertToObjectAssignmentElement = convertToObjectAssignmentElement;
     function convertToAssignmentPattern(node) {
         switch (node.kind) {
-            case 181:
-            case 183:
+            case 181 /* ArrayBindingPattern */:
+            case 183 /* ArrayLiteralExpression */:
                 return convertToArrayAssignmentPattern(node);
-            case 180:
-            case 184:
+            case 180 /* ObjectBindingPattern */:
+            case 184 /* ObjectLiteralExpression */:
                 return convertToObjectAssignmentPattern(node);
         }
     }
@@ -49001,11 +59381,21 @@ var ts;
         return visitedNode;
     }
     ts.visitNode = visitNode;
+    /**
+     * Visits a NodeArray using the supplied visitor, possibly returning a new NodeArray in its place.
+     *
+     * @param nodes The NodeArray to visit.
+     * @param visitor The callback used to visit a Node.
+     * @param test A node test to execute for each node.
+     * @param start An optional value indicating the starting offset at which to start visiting.
+     * @param count An optional value indicating the maximum number of nodes to visit.
+     */
     function visitNodes(nodes, visitor, test, start, count) {
         if (nodes === undefined || visitor === undefined) {
             return nodes;
         }
         var updated;
+        // Ensure start and count have valid values
         var length = nodes.length;
         if (start === undefined || start < 0) {
             start = 0;
@@ -49014,14 +59404,19 @@ var ts;
             count = length - start;
         }
         if (start > 0 || count < length) {
-            updated = ts.createNodeArray([], nodes.hasTrailingComma && start + count === length);
+            // If we are not visiting all of the original nodes, we must always create a new array.
+            // Since this is a fragment of a node array, we do not copy over the previous location
+            // and will only copy over `hasTrailingComma` if we are including the last element.
+            updated = ts.createNodeArray([], /*hasTrailingComma*/ nodes.hasTrailingComma && start + count === length);
         }
+        // Visit each original node.
         for (var i = 0; i < count; i++) {
             var node = nodes[i + start];
             ts.aggregateTransformFlags(node);
             var visited = node !== undefined ? visitor(node) : undefined;
             if (updated !== undefined || visited === undefined || visited !== node) {
                 if (updated === undefined) {
+                    // Ensure we have a copy of `nodes`, up to the current index.
                     updated = ts.createNodeArray(nodes.slice(0, i), nodes.hasTrailingComma);
                     ts.setTextRange(updated, nodes);
                 }
@@ -49045,6 +59440,10 @@ var ts;
         return updated || nodes;
     }
     ts.visitNodes = visitNodes;
+    /**
+     * Starts a new lexical environment and visits a statement list, ending the lexical environment
+     * and merging hoisted declarations upon completion.
+     */
     function visitLexicalEnvironment(statements, visitor, context, start, ensureUseStrict) {
         context.startLexicalEnvironment();
         statements = visitNodes(statements, visitor, ts.isStatement, start);
@@ -49055,6 +59454,10 @@ var ts;
         return ts.setTextRange(ts.createNodeArray(ts.concatenate(declarations, statements)), statements);
     }
     ts.visitLexicalEnvironment = visitLexicalEnvironment;
+    /**
+     * Starts a new lexical environment and visits a parameter list, suspending the lexical
+     * environment upon completion.
+     */
     function visitParameterList(nodes, visitor, context, nodesVisitor) {
         if (nodesVisitor === void 0) { nodesVisitor = visitNodes; }
         context.startLexicalEnvironment();
@@ -49081,268 +59484,291 @@ var ts;
             return undefined;
         }
         var kind = node.kind;
-        if ((kind > 0 && kind <= 145) || kind === 174) {
+        // No need to visit nodes with no children.
+        if ((kind > 0 /* FirstToken */ && kind <= 145 /* LastToken */) || kind === 174 /* ThisType */) {
             return node;
         }
         switch (kind) {
-            case 71:
+            // Names
+            case 71 /* Identifier */:
                 return ts.updateIdentifier(node, nodesVisitor(node.typeArguments, visitor, isTypeNodeOrTypeParameterDeclaration));
-            case 146:
+            case 146 /* QualifiedName */:
                 return ts.updateQualifiedName(node, visitNode(node.left, visitor, ts.isEntityName), visitNode(node.right, visitor, ts.isIdentifier));
-            case 147:
+            case 147 /* ComputedPropertyName */:
                 return ts.updateComputedPropertyName(node, visitNode(node.expression, visitor, ts.isExpression));
-            case 148:
+            // Signature elements
+            case 148 /* TypeParameter */:
                 return ts.updateTypeParameterDeclaration(node, visitNode(node.name, visitor, ts.isIdentifier), visitNode(node.constraint, visitor, ts.isTypeNode), visitNode(node.default, visitor, ts.isTypeNode));
-            case 149:
+            case 149 /* Parameter */:
                 return ts.updateParameter(node, nodesVisitor(node.decorators, visitor, ts.isDecorator), nodesVisitor(node.modifiers, visitor, ts.isModifier), visitNode(node.dotDotDotToken, tokenVisitor, ts.isToken), visitNode(node.name, visitor, ts.isBindingName), visitNode(node.questionToken, tokenVisitor, ts.isToken), visitNode(node.type, visitor, ts.isTypeNode), visitNode(node.initializer, visitor, ts.isExpression));
-            case 150:
+            case 150 /* Decorator */:
                 return ts.updateDecorator(node, visitNode(node.expression, visitor, ts.isExpression));
-            case 151:
+            // Type elements
+            case 151 /* PropertySignature */:
                 return ts.updatePropertySignature(node, nodesVisitor(node.modifiers, visitor, ts.isToken), visitNode(node.name, visitor, ts.isPropertyName), visitNode(node.questionToken, tokenVisitor, ts.isToken), visitNode(node.type, visitor, ts.isTypeNode), visitNode(node.initializer, visitor, ts.isExpression));
-            case 152:
+            case 152 /* PropertyDeclaration */:
                 return ts.updateProperty(node, nodesVisitor(node.decorators, visitor, ts.isDecorator), nodesVisitor(node.modifiers, visitor, ts.isModifier), visitNode(node.name, visitor, ts.isPropertyName), visitNode(node.questionToken, tokenVisitor, ts.isToken), visitNode(node.type, visitor, ts.isTypeNode), visitNode(node.initializer, visitor, ts.isExpression));
-            case 153:
+            case 153 /* MethodSignature */:
                 return ts.updateMethodSignature(node, nodesVisitor(node.typeParameters, visitor, ts.isTypeParameterDeclaration), nodesVisitor(node.parameters, visitor, ts.isParameterDeclaration), visitNode(node.type, visitor, ts.isTypeNode), visitNode(node.name, visitor, ts.isPropertyName), visitNode(node.questionToken, tokenVisitor, ts.isToken));
-            case 154:
+            case 154 /* MethodDeclaration */:
                 return ts.updateMethod(node, nodesVisitor(node.decorators, visitor, ts.isDecorator), nodesVisitor(node.modifiers, visitor, ts.isModifier), visitNode(node.asteriskToken, tokenVisitor, ts.isToken), visitNode(node.name, visitor, ts.isPropertyName), visitNode(node.questionToken, tokenVisitor, ts.isToken), nodesVisitor(node.typeParameters, visitor, ts.isTypeParameterDeclaration), visitParameterList(node.parameters, visitor, context, nodesVisitor), visitNode(node.type, visitor, ts.isTypeNode), visitFunctionBody(node.body, visitor, context));
-            case 155:
+            case 155 /* Constructor */:
                 return ts.updateConstructor(node, nodesVisitor(node.decorators, visitor, ts.isDecorator), nodesVisitor(node.modifiers, visitor, ts.isModifier), visitParameterList(node.parameters, visitor, context, nodesVisitor), visitFunctionBody(node.body, visitor, context));
-            case 156:
+            case 156 /* GetAccessor */:
                 return ts.updateGetAccessor(node, nodesVisitor(node.decorators, visitor, ts.isDecorator), nodesVisitor(node.modifiers, visitor, ts.isModifier), visitNode(node.name, visitor, ts.isPropertyName), visitParameterList(node.parameters, visitor, context, nodesVisitor), visitNode(node.type, visitor, ts.isTypeNode), visitFunctionBody(node.body, visitor, context));
-            case 157:
+            case 157 /* SetAccessor */:
                 return ts.updateSetAccessor(node, nodesVisitor(node.decorators, visitor, ts.isDecorator), nodesVisitor(node.modifiers, visitor, ts.isModifier), visitNode(node.name, visitor, ts.isPropertyName), visitParameterList(node.parameters, visitor, context, nodesVisitor), visitFunctionBody(node.body, visitor, context));
-            case 158:
+            case 158 /* CallSignature */:
                 return ts.updateCallSignature(node, nodesVisitor(node.typeParameters, visitor, ts.isTypeParameterDeclaration), nodesVisitor(node.parameters, visitor, ts.isParameterDeclaration), visitNode(node.type, visitor, ts.isTypeNode));
-            case 159:
+            case 159 /* ConstructSignature */:
                 return ts.updateConstructSignature(node, nodesVisitor(node.typeParameters, visitor, ts.isTypeParameterDeclaration), nodesVisitor(node.parameters, visitor, ts.isParameterDeclaration), visitNode(node.type, visitor, ts.isTypeNode));
-            case 160:
+            case 160 /* IndexSignature */:
                 return ts.updateIndexSignature(node, nodesVisitor(node.decorators, visitor, ts.isDecorator), nodesVisitor(node.modifiers, visitor, ts.isModifier), nodesVisitor(node.parameters, visitor, ts.isParameterDeclaration), visitNode(node.type, visitor, ts.isTypeNode));
-            case 161:
+            // Types
+            case 161 /* TypePredicate */:
                 return ts.updateTypePredicateNode(node, visitNode(node.parameterName, visitor), visitNode(node.type, visitor, ts.isTypeNode));
-            case 162:
+            case 162 /* TypeReference */:
                 return ts.updateTypeReferenceNode(node, visitNode(node.typeName, visitor, ts.isEntityName), nodesVisitor(node.typeArguments, visitor, ts.isTypeNode));
-            case 163:
+            case 163 /* FunctionType */:
                 return ts.updateFunctionTypeNode(node, nodesVisitor(node.typeParameters, visitor, ts.isTypeParameterDeclaration), nodesVisitor(node.parameters, visitor, ts.isParameterDeclaration), visitNode(node.type, visitor, ts.isTypeNode));
-            case 164:
+            case 164 /* ConstructorType */:
                 return ts.updateConstructorTypeNode(node, nodesVisitor(node.typeParameters, visitor, ts.isTypeParameterDeclaration), nodesVisitor(node.parameters, visitor, ts.isParameterDeclaration), visitNode(node.type, visitor, ts.isTypeNode));
-            case 165:
+            case 165 /* TypeQuery */:
                 return ts.updateTypeQueryNode(node, visitNode(node.exprName, visitor, ts.isEntityName));
-            case 166:
+            case 166 /* TypeLiteral */:
                 return ts.updateTypeLiteralNode(node, nodesVisitor(node.members, visitor, ts.isTypeElement));
-            case 167:
+            case 167 /* ArrayType */:
                 return ts.updateArrayTypeNode(node, visitNode(node.elementType, visitor, ts.isTypeNode));
-            case 168:
+            case 168 /* TupleType */:
                 return ts.updateTypleTypeNode(node, nodesVisitor(node.elementTypes, visitor, ts.isTypeNode));
-            case 169:
+            case 169 /* UnionType */:
                 return ts.updateUnionTypeNode(node, nodesVisitor(node.types, visitor, ts.isTypeNode));
-            case 170:
+            case 170 /* IntersectionType */:
                 return ts.updateIntersectionTypeNode(node, nodesVisitor(node.types, visitor, ts.isTypeNode));
-            case 171:
+            case 171 /* ConditionalType */:
                 return ts.updateConditionalTypeNode(node, visitNode(node.checkType, visitor, ts.isTypeNode), visitNode(node.extendsType, visitor, ts.isTypeNode), visitNode(node.trueType, visitor, ts.isTypeNode), visitNode(node.falseType, visitor, ts.isTypeNode));
-            case 172:
+            case 172 /* InferType */:
                 return ts.updateInferTypeNode(node, visitNode(node.typeParameter, visitor, ts.isTypeParameterDeclaration));
-            case 179:
+            case 179 /* ImportType */:
                 return ts.updateImportTypeNode(node, visitNode(node.argument, visitor, ts.isTypeNode), visitNode(node.qualifier, visitor, ts.isEntityName), visitNodes(node.typeArguments, visitor, ts.isTypeNode), node.isTypeOf);
-            case 173:
+            case 173 /* ParenthesizedType */:
                 return ts.updateParenthesizedType(node, visitNode(node.type, visitor, ts.isTypeNode));
-            case 175:
+            case 175 /* TypeOperator */:
                 return ts.updateTypeOperatorNode(node, visitNode(node.type, visitor, ts.isTypeNode));
-            case 176:
+            case 176 /* IndexedAccessType */:
                 return ts.updateIndexedAccessTypeNode(node, visitNode(node.objectType, visitor, ts.isTypeNode), visitNode(node.indexType, visitor, ts.isTypeNode));
-            case 177:
+            case 177 /* MappedType */:
                 return ts.updateMappedTypeNode(node, visitNode(node.readonlyToken, tokenVisitor, ts.isToken), visitNode(node.typeParameter, visitor, ts.isTypeParameterDeclaration), visitNode(node.questionToken, tokenVisitor, ts.isToken), visitNode(node.type, visitor, ts.isTypeNode));
-            case 178:
+            case 178 /* LiteralType */:
                 return ts.updateLiteralTypeNode(node, visitNode(node.literal, visitor, ts.isExpression));
-            case 180:
+            // Binding patterns
+            case 180 /* ObjectBindingPattern */:
                 return ts.updateObjectBindingPattern(node, nodesVisitor(node.elements, visitor, ts.isBindingElement));
-            case 181:
+            case 181 /* ArrayBindingPattern */:
                 return ts.updateArrayBindingPattern(node, nodesVisitor(node.elements, visitor, ts.isArrayBindingElement));
-            case 182:
+            case 182 /* BindingElement */:
                 return ts.updateBindingElement(node, visitNode(node.dotDotDotToken, tokenVisitor, ts.isToken), visitNode(node.propertyName, visitor, ts.isPropertyName), visitNode(node.name, visitor, ts.isBindingName), visitNode(node.initializer, visitor, ts.isExpression));
-            case 183:
+            // Expression
+            case 183 /* ArrayLiteralExpression */:
                 return ts.updateArrayLiteral(node, nodesVisitor(node.elements, visitor, ts.isExpression));
-            case 184:
+            case 184 /* ObjectLiteralExpression */:
                 return ts.updateObjectLiteral(node, nodesVisitor(node.properties, visitor, ts.isObjectLiteralElementLike));
-            case 185:
+            case 185 /* PropertyAccessExpression */:
                 return ts.updatePropertyAccess(node, visitNode(node.expression, visitor, ts.isExpression), visitNode(node.name, visitor, ts.isIdentifier));
-            case 186:
+            case 186 /* ElementAccessExpression */:
                 return ts.updateElementAccess(node, visitNode(node.expression, visitor, ts.isExpression), visitNode(node.argumentExpression, visitor, ts.isExpression));
-            case 187:
+            case 187 /* CallExpression */:
                 return ts.updateCall(node, visitNode(node.expression, visitor, ts.isExpression), nodesVisitor(node.typeArguments, visitor, ts.isTypeNode), nodesVisitor(node.arguments, visitor, ts.isExpression));
-            case 188:
+            case 188 /* NewExpression */:
                 return ts.updateNew(node, visitNode(node.expression, visitor, ts.isExpression), nodesVisitor(node.typeArguments, visitor, ts.isTypeNode), nodesVisitor(node.arguments, visitor, ts.isExpression));
-            case 189:
+            case 189 /* TaggedTemplateExpression */:
                 return ts.updateTaggedTemplate(node, visitNode(node.tag, visitor, ts.isExpression), visitNodes(node.typeArguments, visitor, ts.isExpression), visitNode(node.template, visitor, ts.isTemplateLiteral));
-            case 190:
+            case 190 /* TypeAssertionExpression */:
                 return ts.updateTypeAssertion(node, visitNode(node.type, visitor, ts.isTypeNode), visitNode(node.expression, visitor, ts.isExpression));
-            case 191:
+            case 191 /* ParenthesizedExpression */:
                 return ts.updateParen(node, visitNode(node.expression, visitor, ts.isExpression));
-            case 192:
+            case 192 /* FunctionExpression */:
                 return ts.updateFunctionExpression(node, nodesVisitor(node.modifiers, visitor, ts.isModifier), visitNode(node.asteriskToken, tokenVisitor, ts.isToken), visitNode(node.name, visitor, ts.isIdentifier), nodesVisitor(node.typeParameters, visitor, ts.isTypeParameterDeclaration), visitParameterList(node.parameters, visitor, context, nodesVisitor), visitNode(node.type, visitor, ts.isTypeNode), visitFunctionBody(node.body, visitor, context));
-            case 193:
+            case 193 /* ArrowFunction */:
                 return ts.updateArrowFunction(node, nodesVisitor(node.modifiers, visitor, ts.isModifier), nodesVisitor(node.typeParameters, visitor, ts.isTypeParameterDeclaration), visitParameterList(node.parameters, visitor, context, nodesVisitor), visitNode(node.type, visitor, ts.isTypeNode), visitNode(node.equalsGreaterThanToken, visitor, ts.isToken), visitFunctionBody(node.body, visitor, context));
-            case 194:
+            case 194 /* DeleteExpression */:
                 return ts.updateDelete(node, visitNode(node.expression, visitor, ts.isExpression));
-            case 195:
+            case 195 /* TypeOfExpression */:
                 return ts.updateTypeOf(node, visitNode(node.expression, visitor, ts.isExpression));
-            case 196:
+            case 196 /* VoidExpression */:
                 return ts.updateVoid(node, visitNode(node.expression, visitor, ts.isExpression));
-            case 197:
+            case 197 /* AwaitExpression */:
                 return ts.updateAwait(node, visitNode(node.expression, visitor, ts.isExpression));
-            case 198:
+            case 198 /* PrefixUnaryExpression */:
                 return ts.updatePrefix(node, visitNode(node.operand, visitor, ts.isExpression));
-            case 199:
+            case 199 /* PostfixUnaryExpression */:
                 return ts.updatePostfix(node, visitNode(node.operand, visitor, ts.isExpression));
-            case 200:
+            case 200 /* BinaryExpression */:
                 return ts.updateBinary(node, visitNode(node.left, visitor, ts.isExpression), visitNode(node.right, visitor, ts.isExpression), visitNode(node.operatorToken, visitor, ts.isToken));
-            case 201:
+            case 201 /* ConditionalExpression */:
                 return ts.updateConditional(node, visitNode(node.condition, visitor, ts.isExpression), visitNode(node.questionToken, visitor, ts.isToken), visitNode(node.whenTrue, visitor, ts.isExpression), visitNode(node.colonToken, visitor, ts.isToken), visitNode(node.whenFalse, visitor, ts.isExpression));
-            case 202:
+            case 202 /* TemplateExpression */:
                 return ts.updateTemplateExpression(node, visitNode(node.head, visitor, ts.isTemplateHead), nodesVisitor(node.templateSpans, visitor, ts.isTemplateSpan));
-            case 203:
+            case 203 /* YieldExpression */:
                 return ts.updateYield(node, visitNode(node.asteriskToken, tokenVisitor, ts.isToken), visitNode(node.expression, visitor, ts.isExpression));
-            case 204:
+            case 204 /* SpreadElement */:
                 return ts.updateSpread(node, visitNode(node.expression, visitor, ts.isExpression));
-            case 205:
+            case 205 /* ClassExpression */:
                 return ts.updateClassExpression(node, nodesVisitor(node.modifiers, visitor, ts.isModifier), visitNode(node.name, visitor, ts.isIdentifier), nodesVisitor(node.typeParameters, visitor, ts.isTypeParameterDeclaration), nodesVisitor(node.heritageClauses, visitor, ts.isHeritageClause), nodesVisitor(node.members, visitor, ts.isClassElement));
-            case 207:
+            case 207 /* ExpressionWithTypeArguments */:
                 return ts.updateExpressionWithTypeArguments(node, nodesVisitor(node.typeArguments, visitor, ts.isTypeNode), visitNode(node.expression, visitor, ts.isExpression));
-            case 208:
+            case 208 /* AsExpression */:
                 return ts.updateAsExpression(node, visitNode(node.expression, visitor, ts.isExpression), visitNode(node.type, visitor, ts.isTypeNode));
-            case 209:
+            case 209 /* NonNullExpression */:
                 return ts.updateNonNullExpression(node, visitNode(node.expression, visitor, ts.isExpression));
-            case 210:
+            case 210 /* MetaProperty */:
                 return ts.updateMetaProperty(node, visitNode(node.name, visitor, ts.isIdentifier));
-            case 211:
+            // Misc
+            case 211 /* TemplateSpan */:
                 return ts.updateTemplateSpan(node, visitNode(node.expression, visitor, ts.isExpression), visitNode(node.literal, visitor, ts.isTemplateMiddleOrTemplateTail));
-            case 213:
+            // Element
+            case 213 /* Block */:
                 return ts.updateBlock(node, nodesVisitor(node.statements, visitor, ts.isStatement));
-            case 214:
+            case 214 /* VariableStatement */:
                 return ts.updateVariableStatement(node, nodesVisitor(node.modifiers, visitor, ts.isModifier), visitNode(node.declarationList, visitor, ts.isVariableDeclarationList));
-            case 216:
+            case 216 /* ExpressionStatement */:
                 return ts.updateStatement(node, visitNode(node.expression, visitor, ts.isExpression));
-            case 217:
+            case 217 /* IfStatement */:
                 return ts.updateIf(node, visitNode(node.expression, visitor, ts.isExpression), visitNode(node.thenStatement, visitor, ts.isStatement, ts.liftToBlock), visitNode(node.elseStatement, visitor, ts.isStatement, ts.liftToBlock));
-            case 218:
+            case 218 /* DoStatement */:
                 return ts.updateDo(node, visitNode(node.statement, visitor, ts.isStatement, ts.liftToBlock), visitNode(node.expression, visitor, ts.isExpression));
-            case 219:
+            case 219 /* WhileStatement */:
                 return ts.updateWhile(node, visitNode(node.expression, visitor, ts.isExpression), visitNode(node.statement, visitor, ts.isStatement, ts.liftToBlock));
-            case 220:
+            case 220 /* ForStatement */:
                 return ts.updateFor(node, visitNode(node.initializer, visitor, ts.isForInitializer), visitNode(node.condition, visitor, ts.isExpression), visitNode(node.incrementor, visitor, ts.isExpression), visitNode(node.statement, visitor, ts.isStatement, ts.liftToBlock));
-            case 221:
+            case 221 /* ForInStatement */:
                 return ts.updateForIn(node, visitNode(node.initializer, visitor, ts.isForInitializer), visitNode(node.expression, visitor, ts.isExpression), visitNode(node.statement, visitor, ts.isStatement, ts.liftToBlock));
-            case 222:
+            case 222 /* ForOfStatement */:
                 return ts.updateForOf(node, visitNode(node.awaitModifier, visitor, ts.isToken), visitNode(node.initializer, visitor, ts.isForInitializer), visitNode(node.expression, visitor, ts.isExpression), visitNode(node.statement, visitor, ts.isStatement, ts.liftToBlock));
-            case 223:
+            case 223 /* ContinueStatement */:
                 return ts.updateContinue(node, visitNode(node.label, visitor, ts.isIdentifier));
-            case 224:
+            case 224 /* BreakStatement */:
                 return ts.updateBreak(node, visitNode(node.label, visitor, ts.isIdentifier));
-            case 225:
+            case 225 /* ReturnStatement */:
                 return ts.updateReturn(node, visitNode(node.expression, visitor, ts.isExpression));
-            case 226:
+            case 226 /* WithStatement */:
                 return ts.updateWith(node, visitNode(node.expression, visitor, ts.isExpression), visitNode(node.statement, visitor, ts.isStatement, ts.liftToBlock));
-            case 227:
+            case 227 /* SwitchStatement */:
                 return ts.updateSwitch(node, visitNode(node.expression, visitor, ts.isExpression), visitNode(node.caseBlock, visitor, ts.isCaseBlock));
-            case 228:
+            case 228 /* LabeledStatement */:
                 return ts.updateLabel(node, visitNode(node.label, visitor, ts.isIdentifier), visitNode(node.statement, visitor, ts.isStatement, ts.liftToBlock));
-            case 229:
+            case 229 /* ThrowStatement */:
                 return ts.updateThrow(node, visitNode(node.expression, visitor, ts.isExpression));
-            case 230:
+            case 230 /* TryStatement */:
                 return ts.updateTry(node, visitNode(node.tryBlock, visitor, ts.isBlock), visitNode(node.catchClause, visitor, ts.isCatchClause), visitNode(node.finallyBlock, visitor, ts.isBlock));
-            case 232:
+            case 232 /* VariableDeclaration */:
                 return ts.updateVariableDeclaration(node, visitNode(node.name, visitor, ts.isBindingName), visitNode(node.type, visitor, ts.isTypeNode), visitNode(node.initializer, visitor, ts.isExpression));
-            case 233:
+            case 233 /* VariableDeclarationList */:
                 return ts.updateVariableDeclarationList(node, nodesVisitor(node.declarations, visitor, ts.isVariableDeclaration));
-            case 234:
+            case 234 /* FunctionDeclaration */:
                 return ts.updateFunctionDeclaration(node, nodesVisitor(node.decorators, visitor, ts.isDecorator), nodesVisitor(node.modifiers, visitor, ts.isModifier), visitNode(node.asteriskToken, tokenVisitor, ts.isToken), visitNode(node.name, visitor, ts.isIdentifier), nodesVisitor(node.typeParameters, visitor, ts.isTypeParameterDeclaration), visitParameterList(node.parameters, visitor, context, nodesVisitor), visitNode(node.type, visitor, ts.isTypeNode), visitFunctionBody(node.body, visitor, context));
-            case 235:
+            case 235 /* ClassDeclaration */:
                 return ts.updateClassDeclaration(node, nodesVisitor(node.decorators, visitor, ts.isDecorator), nodesVisitor(node.modifiers, visitor, ts.isModifier), visitNode(node.name, visitor, ts.isIdentifier), nodesVisitor(node.typeParameters, visitor, ts.isTypeParameterDeclaration), nodesVisitor(node.heritageClauses, visitor, ts.isHeritageClause), nodesVisitor(node.members, visitor, ts.isClassElement));
-            case 236:
+            case 236 /* InterfaceDeclaration */:
                 return ts.updateInterfaceDeclaration(node, nodesVisitor(node.decorators, visitor, ts.isDecorator), nodesVisitor(node.modifiers, visitor, ts.isModifier), visitNode(node.name, visitor, ts.isIdentifier), nodesVisitor(node.typeParameters, visitor, ts.isTypeParameterDeclaration), nodesVisitor(node.heritageClauses, visitor, ts.isHeritageClause), nodesVisitor(node.members, visitor, ts.isTypeElement));
-            case 237:
+            case 237 /* TypeAliasDeclaration */:
                 return ts.updateTypeAliasDeclaration(node, nodesVisitor(node.decorators, visitor, ts.isDecorator), nodesVisitor(node.modifiers, visitor, ts.isModifier), visitNode(node.name, visitor, ts.isIdentifier), nodesVisitor(node.typeParameters, visitor, ts.isTypeParameterDeclaration), visitNode(node.type, visitor, ts.isTypeNode));
-            case 238:
+            case 238 /* EnumDeclaration */:
                 return ts.updateEnumDeclaration(node, nodesVisitor(node.decorators, visitor, ts.isDecorator), nodesVisitor(node.modifiers, visitor, ts.isModifier), visitNode(node.name, visitor, ts.isIdentifier), nodesVisitor(node.members, visitor, ts.isEnumMember));
-            case 239:
+            case 239 /* ModuleDeclaration */:
                 return ts.updateModuleDeclaration(node, nodesVisitor(node.decorators, visitor, ts.isDecorator), nodesVisitor(node.modifiers, visitor, ts.isModifier), visitNode(node.name, visitor, ts.isIdentifier), visitNode(node.body, visitor, ts.isModuleBody));
-            case 240:
+            case 240 /* ModuleBlock */:
                 return ts.updateModuleBlock(node, nodesVisitor(node.statements, visitor, ts.isStatement));
-            case 241:
+            case 241 /* CaseBlock */:
                 return ts.updateCaseBlock(node, nodesVisitor(node.clauses, visitor, ts.isCaseOrDefaultClause));
-            case 242:
+            case 242 /* NamespaceExportDeclaration */:
                 return ts.updateNamespaceExportDeclaration(node, visitNode(node.name, visitor, ts.isIdentifier));
-            case 243:
+            case 243 /* ImportEqualsDeclaration */:
                 return ts.updateImportEqualsDeclaration(node, nodesVisitor(node.decorators, visitor, ts.isDecorator), nodesVisitor(node.modifiers, visitor, ts.isModifier), visitNode(node.name, visitor, ts.isIdentifier), visitNode(node.moduleReference, visitor, ts.isModuleReference));
-            case 244:
+            case 244 /* ImportDeclaration */:
                 return ts.updateImportDeclaration(node, nodesVisitor(node.decorators, visitor, ts.isDecorator), nodesVisitor(node.modifiers, visitor, ts.isModifier), visitNode(node.importClause, visitor, ts.isImportClause), visitNode(node.moduleSpecifier, visitor, ts.isExpression));
-            case 245:
+            case 245 /* ImportClause */:
                 return ts.updateImportClause(node, visitNode(node.name, visitor, ts.isIdentifier), visitNode(node.namedBindings, visitor, ts.isNamedImportBindings));
-            case 246:
+            case 246 /* NamespaceImport */:
                 return ts.updateNamespaceImport(node, visitNode(node.name, visitor, ts.isIdentifier));
-            case 247:
+            case 247 /* NamedImports */:
                 return ts.updateNamedImports(node, nodesVisitor(node.elements, visitor, ts.isImportSpecifier));
-            case 248:
+            case 248 /* ImportSpecifier */:
                 return ts.updateImportSpecifier(node, visitNode(node.propertyName, visitor, ts.isIdentifier), visitNode(node.name, visitor, ts.isIdentifier));
-            case 249:
+            case 249 /* ExportAssignment */:
                 return ts.updateExportAssignment(node, nodesVisitor(node.decorators, visitor, ts.isDecorator), nodesVisitor(node.modifiers, visitor, ts.isModifier), visitNode(node.expression, visitor, ts.isExpression));
-            case 250:
+            case 250 /* ExportDeclaration */:
                 return ts.updateExportDeclaration(node, nodesVisitor(node.decorators, visitor, ts.isDecorator), nodesVisitor(node.modifiers, visitor, ts.isModifier), visitNode(node.exportClause, visitor, ts.isNamedExports), visitNode(node.moduleSpecifier, visitor, ts.isExpression));
-            case 251:
+            case 251 /* NamedExports */:
                 return ts.updateNamedExports(node, nodesVisitor(node.elements, visitor, ts.isExportSpecifier));
-            case 252:
+            case 252 /* ExportSpecifier */:
                 return ts.updateExportSpecifier(node, visitNode(node.propertyName, visitor, ts.isIdentifier), visitNode(node.name, visitor, ts.isIdentifier));
-            case 254:
+            // Module references
+            case 254 /* ExternalModuleReference */:
                 return ts.updateExternalModuleReference(node, visitNode(node.expression, visitor, ts.isExpression));
-            case 255:
+            // JSX
+            case 255 /* JsxElement */:
                 return ts.updateJsxElement(node, visitNode(node.openingElement, visitor, ts.isJsxOpeningElement), nodesVisitor(node.children, visitor, ts.isJsxChild), visitNode(node.closingElement, visitor, ts.isJsxClosingElement));
-            case 256:
+            case 256 /* JsxSelfClosingElement */:
                 return ts.updateJsxSelfClosingElement(node, visitNode(node.tagName, visitor, ts.isJsxTagNameExpression), nodesVisitor(node.typeArguments, visitor, ts.isTypeNode), visitNode(node.attributes, visitor, ts.isJsxAttributes));
-            case 257:
+            case 257 /* JsxOpeningElement */:
                 return ts.updateJsxOpeningElement(node, visitNode(node.tagName, visitor, ts.isJsxTagNameExpression), nodesVisitor(node.typeArguments, visitor, ts.isTypeNode), visitNode(node.attributes, visitor, ts.isJsxAttributes));
-            case 258:
+            case 258 /* JsxClosingElement */:
                 return ts.updateJsxClosingElement(node, visitNode(node.tagName, visitor, ts.isJsxTagNameExpression));
-            case 259:
+            case 259 /* JsxFragment */:
                 return ts.updateJsxFragment(node, visitNode(node.openingFragment, visitor, ts.isJsxOpeningFragment), nodesVisitor(node.children, visitor, ts.isJsxChild), visitNode(node.closingFragment, visitor, ts.isJsxClosingFragment));
-            case 262:
+            case 262 /* JsxAttribute */:
                 return ts.updateJsxAttribute(node, visitNode(node.name, visitor, ts.isIdentifier), visitNode(node.initializer, visitor, ts.isStringLiteralOrJsxExpression));
-            case 263:
+            case 263 /* JsxAttributes */:
                 return ts.updateJsxAttributes(node, nodesVisitor(node.properties, visitor, ts.isJsxAttributeLike));
-            case 264:
+            case 264 /* JsxSpreadAttribute */:
                 return ts.updateJsxSpreadAttribute(node, visitNode(node.expression, visitor, ts.isExpression));
-            case 265:
+            case 265 /* JsxExpression */:
                 return ts.updateJsxExpression(node, visitNode(node.expression, visitor, ts.isExpression));
-            case 266:
+            // Clauses
+            case 266 /* CaseClause */:
                 return ts.updateCaseClause(node, visitNode(node.expression, visitor, ts.isExpression), nodesVisitor(node.statements, visitor, ts.isStatement));
-            case 267:
+            case 267 /* DefaultClause */:
                 return ts.updateDefaultClause(node, nodesVisitor(node.statements, visitor, ts.isStatement));
-            case 268:
+            case 268 /* HeritageClause */:
                 return ts.updateHeritageClause(node, nodesVisitor(node.types, visitor, ts.isExpressionWithTypeArguments));
-            case 269:
+            case 269 /* CatchClause */:
                 return ts.updateCatchClause(node, visitNode(node.variableDeclaration, visitor, ts.isVariableDeclaration), visitNode(node.block, visitor, ts.isBlock));
-            case 270:
+            // Property assignments
+            case 270 /* PropertyAssignment */:
                 return ts.updatePropertyAssignment(node, visitNode(node.name, visitor, ts.isPropertyName), visitNode(node.initializer, visitor, ts.isExpression));
-            case 271:
+            case 271 /* ShorthandPropertyAssignment */:
                 return ts.updateShorthandPropertyAssignment(node, visitNode(node.name, visitor, ts.isIdentifier), visitNode(node.objectAssignmentInitializer, visitor, ts.isExpression));
-            case 272:
+            case 272 /* SpreadAssignment */:
                 return ts.updateSpreadAssignment(node, visitNode(node.expression, visitor, ts.isExpression));
-            case 273:
+            // Enum
+            case 273 /* EnumMember */:
                 return ts.updateEnumMember(node, visitNode(node.name, visitor, ts.isPropertyName), visitNode(node.initializer, visitor, ts.isExpression));
-            case 274:
+            // Top-level nodes
+            case 274 /* SourceFile */:
                 return ts.updateSourceFileNode(node, visitLexicalEnvironment(node.statements, visitor, context));
-            case 301:
+            // Transformation nodes
+            case 301 /* PartiallyEmittedExpression */:
                 return ts.updatePartiallyEmittedExpression(node, visitNode(node.expression, visitor, ts.isExpression));
-            case 302:
+            case 302 /* CommaListExpression */:
                 return ts.updateCommaList(node, nodesVisitor(node.elements, visitor, ts.isExpression));
             default:
+                // No need to visit nodes with no children.
                 return node;
         }
     }
     ts.visitEachChild = visitEachChild;
+    /**
+     * Extracts the single node from a NodeArray.
+     *
+     * @param nodes The NodeArray.
+     */
     function extractSingleNode(nodes) {
         ts.Debug.assert(nodes.length <= 1, "Too many nodes written to output.");
         return ts.singleOrUndefined(nodes);
     }
 })(ts || (ts = {}));
+/* @internal */
 (function (ts) {
     function reduceNode(node, f, initial) {
         return node ? f(initial, node) : initial;
@@ -49350,6 +59776,14 @@ var ts;
     function reduceNodeArray(nodes, f, initial) {
         return nodes ? f(initial, nodes) : initial;
     }
+    /**
+     * Similar to `reduceLeft`, performs a reduction against each child of a node.
+     * NOTE: Unlike `forEachChild`, this does *not* visit every node.
+     *
+     * @param node The node containing the children to reduce.
+     * @param initial The initial value to supply to the reduction.
+     * @param f The callback function
+     */
     function reduceEachChild(node, initial, cbNode, cbNodeArray) {
         if (node === undefined) {
             return initial;
@@ -49357,52 +59791,59 @@ var ts;
         var reduceNodes = cbNodeArray ? reduceNodeArray : ts.reduceLeft;
         var cbNodes = cbNodeArray || cbNode;
         var kind = node.kind;
-        if ((kind > 0 && kind <= 145)) {
+        // No need to visit nodes with no children.
+        if ((kind > 0 /* FirstToken */ && kind <= 145 /* LastToken */)) {
             return initial;
         }
-        if ((kind >= 161 && kind <= 178)) {
+        // We do not yet support types.
+        if ((kind >= 161 /* TypePredicate */ && kind <= 178 /* LiteralType */)) {
             return initial;
         }
         var result = initial;
         switch (node.kind) {
-            case 212:
-            case 215:
-            case 206:
-            case 231:
-            case 300:
+            // Leaf nodes
+            case 212 /* SemicolonClassElement */:
+            case 215 /* EmptyStatement */:
+            case 206 /* OmittedExpression */:
+            case 231 /* DebuggerStatement */:
+            case 300 /* NotEmittedStatement */:
+                // No need to visit nodes with no children.
                 break;
-            case 146:
+            // Names
+            case 146 /* QualifiedName */:
                 result = reduceNode(node.left, cbNode, result);
                 result = reduceNode(node.right, cbNode, result);
                 break;
-            case 147:
+            case 147 /* ComputedPropertyName */:
                 result = reduceNode(node.expression, cbNode, result);
                 break;
-            case 149:
+            // Signature elements
+            case 149 /* Parameter */:
                 result = reduceNodes(node.decorators, cbNodes, result);
                 result = reduceNodes(node.modifiers, cbNodes, result);
                 result = reduceNode(node.name, cbNode, result);
                 result = reduceNode(node.type, cbNode, result);
                 result = reduceNode(node.initializer, cbNode, result);
                 break;
-            case 150:
+            case 150 /* Decorator */:
                 result = reduceNode(node.expression, cbNode, result);
                 break;
-            case 151:
+            // Type member
+            case 151 /* PropertySignature */:
                 result = reduceNodes(node.modifiers, cbNodes, result);
                 result = reduceNode(node.name, cbNode, result);
                 result = reduceNode(node.questionToken, cbNode, result);
                 result = reduceNode(node.type, cbNode, result);
                 result = reduceNode(node.initializer, cbNode, result);
                 break;
-            case 152:
+            case 152 /* PropertyDeclaration */:
                 result = reduceNodes(node.decorators, cbNodes, result);
                 result = reduceNodes(node.modifiers, cbNodes, result);
                 result = reduceNode(node.name, cbNode, result);
                 result = reduceNode(node.type, cbNode, result);
                 result = reduceNode(node.initializer, cbNode, result);
                 break;
-            case 154:
+            case 154 /* MethodDeclaration */:
                 result = reduceNodes(node.decorators, cbNodes, result);
                 result = reduceNodes(node.modifiers, cbNodes, result);
                 result = reduceNode(node.name, cbNode, result);
@@ -49411,12 +59852,12 @@ var ts;
                 result = reduceNode(node.type, cbNode, result);
                 result = reduceNode(node.body, cbNode, result);
                 break;
-            case 155:
+            case 155 /* Constructor */:
                 result = reduceNodes(node.modifiers, cbNodes, result);
                 result = reduceNodes(node.parameters, cbNodes, result);
                 result = reduceNode(node.body, cbNode, result);
                 break;
-            case 156:
+            case 156 /* GetAccessor */:
                 result = reduceNodes(node.decorators, cbNodes, result);
                 result = reduceNodes(node.modifiers, cbNodes, result);
                 result = reduceNode(node.name, cbNode, result);
@@ -49424,55 +59865,57 @@ var ts;
                 result = reduceNode(node.type, cbNode, result);
                 result = reduceNode(node.body, cbNode, result);
                 break;
-            case 157:
+            case 157 /* SetAccessor */:
                 result = reduceNodes(node.decorators, cbNodes, result);
                 result = reduceNodes(node.modifiers, cbNodes, result);
                 result = reduceNode(node.name, cbNode, result);
                 result = reduceNodes(node.parameters, cbNodes, result);
                 result = reduceNode(node.body, cbNode, result);
                 break;
-            case 180:
-            case 181:
+            // Binding patterns
+            case 180 /* ObjectBindingPattern */:
+            case 181 /* ArrayBindingPattern */:
                 result = reduceNodes(node.elements, cbNodes, result);
                 break;
-            case 182:
+            case 182 /* BindingElement */:
                 result = reduceNode(node.propertyName, cbNode, result);
                 result = reduceNode(node.name, cbNode, result);
                 result = reduceNode(node.initializer, cbNode, result);
                 break;
-            case 183:
+            // Expression
+            case 183 /* ArrayLiteralExpression */:
                 result = reduceNodes(node.elements, cbNodes, result);
                 break;
-            case 184:
+            case 184 /* ObjectLiteralExpression */:
                 result = reduceNodes(node.properties, cbNodes, result);
                 break;
-            case 185:
+            case 185 /* PropertyAccessExpression */:
                 result = reduceNode(node.expression, cbNode, result);
                 result = reduceNode(node.name, cbNode, result);
                 break;
-            case 186:
+            case 186 /* ElementAccessExpression */:
                 result = reduceNode(node.expression, cbNode, result);
                 result = reduceNode(node.argumentExpression, cbNode, result);
                 break;
-            case 187:
+            case 187 /* CallExpression */:
                 result = reduceNode(node.expression, cbNode, result);
                 result = reduceNodes(node.typeArguments, cbNodes, result);
                 result = reduceNodes(node.arguments, cbNodes, result);
                 break;
-            case 188:
+            case 188 /* NewExpression */:
                 result = reduceNode(node.expression, cbNode, result);
                 result = reduceNodes(node.typeArguments, cbNodes, result);
                 result = reduceNodes(node.arguments, cbNodes, result);
                 break;
-            case 189:
+            case 189 /* TaggedTemplateExpression */:
                 result = reduceNode(node.tag, cbNode, result);
                 result = reduceNode(node.template, cbNode, result);
                 break;
-            case 190:
+            case 190 /* TypeAssertionExpression */:
                 result = reduceNode(node.type, cbNode, result);
                 result = reduceNode(node.expression, cbNode, result);
                 break;
-            case 192:
+            case 192 /* FunctionExpression */:
                 result = reduceNodes(node.modifiers, cbNodes, result);
                 result = reduceNode(node.name, cbNode, result);
                 result = reduceNodes(node.typeParameters, cbNodes, result);
@@ -49480,121 +59923,123 @@ var ts;
                 result = reduceNode(node.type, cbNode, result);
                 result = reduceNode(node.body, cbNode, result);
                 break;
-            case 193:
+            case 193 /* ArrowFunction */:
                 result = reduceNodes(node.modifiers, cbNodes, result);
                 result = reduceNodes(node.typeParameters, cbNodes, result);
                 result = reduceNodes(node.parameters, cbNodes, result);
                 result = reduceNode(node.type, cbNode, result);
                 result = reduceNode(node.body, cbNode, result);
                 break;
-            case 191:
-            case 194:
-            case 195:
-            case 196:
-            case 197:
-            case 203:
-            case 204:
-            case 209:
+            case 191 /* ParenthesizedExpression */:
+            case 194 /* DeleteExpression */:
+            case 195 /* TypeOfExpression */:
+            case 196 /* VoidExpression */:
+            case 197 /* AwaitExpression */:
+            case 203 /* YieldExpression */:
+            case 204 /* SpreadElement */:
+            case 209 /* NonNullExpression */:
                 result = reduceNode(node.expression, cbNode, result);
                 break;
-            case 198:
-            case 199:
+            case 198 /* PrefixUnaryExpression */:
+            case 199 /* PostfixUnaryExpression */:
                 result = reduceNode(node.operand, cbNode, result);
                 break;
-            case 200:
+            case 200 /* BinaryExpression */:
                 result = reduceNode(node.left, cbNode, result);
                 result = reduceNode(node.right, cbNode, result);
                 break;
-            case 201:
+            case 201 /* ConditionalExpression */:
                 result = reduceNode(node.condition, cbNode, result);
                 result = reduceNode(node.whenTrue, cbNode, result);
                 result = reduceNode(node.whenFalse, cbNode, result);
                 break;
-            case 202:
+            case 202 /* TemplateExpression */:
                 result = reduceNode(node.head, cbNode, result);
                 result = reduceNodes(node.templateSpans, cbNodes, result);
                 break;
-            case 205:
+            case 205 /* ClassExpression */:
                 result = reduceNodes(node.modifiers, cbNodes, result);
                 result = reduceNode(node.name, cbNode, result);
                 result = reduceNodes(node.typeParameters, cbNodes, result);
                 result = reduceNodes(node.heritageClauses, cbNodes, result);
                 result = reduceNodes(node.members, cbNodes, result);
                 break;
-            case 207:
+            case 207 /* ExpressionWithTypeArguments */:
                 result = reduceNode(node.expression, cbNode, result);
                 result = reduceNodes(node.typeArguments, cbNodes, result);
                 break;
-            case 208:
+            case 208 /* AsExpression */:
                 result = reduceNode(node.expression, cbNode, result);
                 result = reduceNode(node.type, cbNode, result);
                 break;
-            case 211:
+            // Misc
+            case 211 /* TemplateSpan */:
                 result = reduceNode(node.expression, cbNode, result);
                 result = reduceNode(node.literal, cbNode, result);
                 break;
-            case 213:
+            // Element
+            case 213 /* Block */:
                 result = reduceNodes(node.statements, cbNodes, result);
                 break;
-            case 214:
+            case 214 /* VariableStatement */:
                 result = reduceNodes(node.modifiers, cbNodes, result);
                 result = reduceNode(node.declarationList, cbNode, result);
                 break;
-            case 216:
+            case 216 /* ExpressionStatement */:
                 result = reduceNode(node.expression, cbNode, result);
                 break;
-            case 217:
+            case 217 /* IfStatement */:
                 result = reduceNode(node.expression, cbNode, result);
                 result = reduceNode(node.thenStatement, cbNode, result);
                 result = reduceNode(node.elseStatement, cbNode, result);
                 break;
-            case 218:
+            case 218 /* DoStatement */:
                 result = reduceNode(node.statement, cbNode, result);
                 result = reduceNode(node.expression, cbNode, result);
                 break;
-            case 219:
-            case 226:
+            case 219 /* WhileStatement */:
+            case 226 /* WithStatement */:
                 result = reduceNode(node.expression, cbNode, result);
                 result = reduceNode(node.statement, cbNode, result);
                 break;
-            case 220:
+            case 220 /* ForStatement */:
                 result = reduceNode(node.initializer, cbNode, result);
                 result = reduceNode(node.condition, cbNode, result);
                 result = reduceNode(node.incrementor, cbNode, result);
                 result = reduceNode(node.statement, cbNode, result);
                 break;
-            case 221:
-            case 222:
+            case 221 /* ForInStatement */:
+            case 222 /* ForOfStatement */:
                 result = reduceNode(node.initializer, cbNode, result);
                 result = reduceNode(node.expression, cbNode, result);
                 result = reduceNode(node.statement, cbNode, result);
                 break;
-            case 225:
-            case 229:
+            case 225 /* ReturnStatement */:
+            case 229 /* ThrowStatement */:
                 result = reduceNode(node.expression, cbNode, result);
                 break;
-            case 227:
+            case 227 /* SwitchStatement */:
                 result = reduceNode(node.expression, cbNode, result);
                 result = reduceNode(node.caseBlock, cbNode, result);
                 break;
-            case 228:
+            case 228 /* LabeledStatement */:
                 result = reduceNode(node.label, cbNode, result);
                 result = reduceNode(node.statement, cbNode, result);
                 break;
-            case 230:
+            case 230 /* TryStatement */:
                 result = reduceNode(node.tryBlock, cbNode, result);
                 result = reduceNode(node.catchClause, cbNode, result);
                 result = reduceNode(node.finallyBlock, cbNode, result);
                 break;
-            case 232:
+            case 232 /* VariableDeclaration */:
                 result = reduceNode(node.name, cbNode, result);
                 result = reduceNode(node.type, cbNode, result);
                 result = reduceNode(node.initializer, cbNode, result);
                 break;
-            case 233:
+            case 233 /* VariableDeclarationList */:
                 result = reduceNodes(node.declarations, cbNodes, result);
                 break;
-            case 234:
+            case 234 /* FunctionDeclaration */:
                 result = reduceNodes(node.decorators, cbNodes, result);
                 result = reduceNodes(node.modifiers, cbNodes, result);
                 result = reduceNode(node.name, cbNode, result);
@@ -49603,7 +60048,7 @@ var ts;
                 result = reduceNode(node.type, cbNode, result);
                 result = reduceNode(node.body, cbNode, result);
                 break;
-            case 235:
+            case 235 /* ClassDeclaration */:
                 result = reduceNodes(node.decorators, cbNodes, result);
                 result = reduceNodes(node.modifiers, cbNodes, result);
                 result = reduceNode(node.name, cbNode, result);
@@ -49611,131 +60056,139 @@ var ts;
                 result = reduceNodes(node.heritageClauses, cbNodes, result);
                 result = reduceNodes(node.members, cbNodes, result);
                 break;
-            case 238:
+            case 238 /* EnumDeclaration */:
                 result = reduceNodes(node.decorators, cbNodes, result);
                 result = reduceNodes(node.modifiers, cbNodes, result);
                 result = reduceNode(node.name, cbNode, result);
                 result = reduceNodes(node.members, cbNodes, result);
                 break;
-            case 239:
+            case 239 /* ModuleDeclaration */:
                 result = reduceNodes(node.decorators, cbNodes, result);
                 result = reduceNodes(node.modifiers, cbNodes, result);
                 result = reduceNode(node.name, cbNode, result);
                 result = reduceNode(node.body, cbNode, result);
                 break;
-            case 240:
+            case 240 /* ModuleBlock */:
                 result = reduceNodes(node.statements, cbNodes, result);
                 break;
-            case 241:
+            case 241 /* CaseBlock */:
                 result = reduceNodes(node.clauses, cbNodes, result);
                 break;
-            case 243:
+            case 243 /* ImportEqualsDeclaration */:
                 result = reduceNodes(node.decorators, cbNodes, result);
                 result = reduceNodes(node.modifiers, cbNodes, result);
                 result = reduceNode(node.name, cbNode, result);
                 result = reduceNode(node.moduleReference, cbNode, result);
                 break;
-            case 244:
+            case 244 /* ImportDeclaration */:
                 result = reduceNodes(node.decorators, cbNodes, result);
                 result = reduceNodes(node.modifiers, cbNodes, result);
                 result = reduceNode(node.importClause, cbNode, result);
                 result = reduceNode(node.moduleSpecifier, cbNode, result);
                 break;
-            case 245:
+            case 245 /* ImportClause */:
                 result = reduceNode(node.name, cbNode, result);
                 result = reduceNode(node.namedBindings, cbNode, result);
                 break;
-            case 246:
+            case 246 /* NamespaceImport */:
                 result = reduceNode(node.name, cbNode, result);
                 break;
-            case 247:
-            case 251:
+            case 247 /* NamedImports */:
+            case 251 /* NamedExports */:
                 result = reduceNodes(node.elements, cbNodes, result);
                 break;
-            case 248:
-            case 252:
+            case 248 /* ImportSpecifier */:
+            case 252 /* ExportSpecifier */:
                 result = reduceNode(node.propertyName, cbNode, result);
                 result = reduceNode(node.name, cbNode, result);
                 break;
-            case 249:
+            case 249 /* ExportAssignment */:
                 result = ts.reduceLeft(node.decorators, cbNode, result);
                 result = ts.reduceLeft(node.modifiers, cbNode, result);
                 result = reduceNode(node.expression, cbNode, result);
                 break;
-            case 250:
+            case 250 /* ExportDeclaration */:
                 result = ts.reduceLeft(node.decorators, cbNode, result);
                 result = ts.reduceLeft(node.modifiers, cbNode, result);
                 result = reduceNode(node.exportClause, cbNode, result);
                 result = reduceNode(node.moduleSpecifier, cbNode, result);
                 break;
-            case 254:
+            // Module references
+            case 254 /* ExternalModuleReference */:
                 result = reduceNode(node.expression, cbNode, result);
                 break;
-            case 255:
+            // JSX
+            case 255 /* JsxElement */:
                 result = reduceNode(node.openingElement, cbNode, result);
                 result = ts.reduceLeft(node.children, cbNode, result);
                 result = reduceNode(node.closingElement, cbNode, result);
                 break;
-            case 259:
+            case 259 /* JsxFragment */:
                 result = reduceNode(node.openingFragment, cbNode, result);
                 result = ts.reduceLeft(node.children, cbNode, result);
                 result = reduceNode(node.closingFragment, cbNode, result);
                 break;
-            case 256:
-            case 257:
+            case 256 /* JsxSelfClosingElement */:
+            case 257 /* JsxOpeningElement */:
                 result = reduceNode(node.tagName, cbNode, result);
                 result = reduceNode(node.attributes, cbNode, result);
                 break;
-            case 263:
+            case 263 /* JsxAttributes */:
                 result = reduceNodes(node.properties, cbNodes, result);
                 break;
-            case 258:
+            case 258 /* JsxClosingElement */:
                 result = reduceNode(node.tagName, cbNode, result);
                 break;
-            case 262:
+            case 262 /* JsxAttribute */:
                 result = reduceNode(node.name, cbNode, result);
                 result = reduceNode(node.initializer, cbNode, result);
                 break;
-            case 264:
+            case 264 /* JsxSpreadAttribute */:
                 result = reduceNode(node.expression, cbNode, result);
                 break;
-            case 265:
+            case 265 /* JsxExpression */:
                 result = reduceNode(node.expression, cbNode, result);
                 break;
-            case 266:
+            // Clauses
+            case 266 /* CaseClause */:
                 result = reduceNode(node.expression, cbNode, result);
-            case 267:
+            // falls through
+            case 267 /* DefaultClause */:
                 result = reduceNodes(node.statements, cbNodes, result);
                 break;
-            case 268:
+            case 268 /* HeritageClause */:
                 result = reduceNodes(node.types, cbNodes, result);
                 break;
-            case 269:
+            case 269 /* CatchClause */:
                 result = reduceNode(node.variableDeclaration, cbNode, result);
                 result = reduceNode(node.block, cbNode, result);
                 break;
-            case 270:
+            // Property assignments
+            case 270 /* PropertyAssignment */:
                 result = reduceNode(node.name, cbNode, result);
                 result = reduceNode(node.initializer, cbNode, result);
                 break;
-            case 271:
+            case 271 /* ShorthandPropertyAssignment */:
                 result = reduceNode(node.name, cbNode, result);
                 result = reduceNode(node.objectAssignmentInitializer, cbNode, result);
                 break;
-            case 272:
+            case 272 /* SpreadAssignment */:
                 result = reduceNode(node.expression, cbNode, result);
                 break;
-            case 273:
+            // Enum
+            case 273 /* EnumMember */:
                 result = reduceNode(node.name, cbNode, result);
                 result = reduceNode(node.initializer, cbNode, result);
                 break;
-            case 274:
+            // Top-level nodes
+            case 274 /* SourceFile */:
                 result = reduceNodes(node.statements, cbNodes, result);
                 break;
-            case 301:
+            // Transformation nodes
+            case 301 /* PartiallyEmittedExpression */:
                 result = reduceNode(node.expression, cbNode, result);
                 break;
-            case 302:
+            case 302 /* CommaListExpression */:
                 result = reduceNodes(node.elements, cbNodes, result);
                 break;
             default:
@@ -49753,21 +60206,36 @@ var ts;
             : ts.prependStatements(statements, declarations);
     }
     ts.mergeLexicalEnvironment = mergeLexicalEnvironment;
+    /**
+     * Lifts a NodeArray containing only Statement nodes to a block.
+     *
+     * @param nodes The NodeArray.
+     */
     function liftToBlock(nodes) {
         Debug.assert(ts.every(nodes, ts.isStatement), "Cannot lift nodes to a Block.");
         return ts.singleOrUndefined(nodes) || ts.createBlock(nodes);
     }
     ts.liftToBlock = liftToBlock;
+    /**
+     * Aggregates the TransformFlags for a Node and its subtree.
+     */
     function aggregateTransformFlags(node) {
         aggregateTransformFlagsForNode(node);
         return node;
     }
     ts.aggregateTransformFlags = aggregateTransformFlags;
+    /**
+     * Aggregates the TransformFlags for a Node and its subtree. The flags for the subtree are
+     * computed first, then the transform flags for the current node are computed from the subtree
+     * flags and the state of the current node. Finally, the transform flags of the node are
+     * returned, excluding any flags that should not be included in its parent node's subtree
+     * flags.
+     */
     function aggregateTransformFlagsForNode(node) {
         if (node === undefined) {
-            return 0;
+            return 0 /* None */;
         }
-        if (node.transformFlags & 536870912) {
+        if (node.transformFlags & 536870912 /* HasComputedFlags */) {
             return node.transformFlags & ~ts.getTransformFlagsSubtreeExclusions(node.kind);
         }
         var subtreeFlags = aggregateTransformFlagsForSubtree(node);
@@ -49775,24 +60243,34 @@ var ts;
     }
     function aggregateTransformFlagsForNodeArray(nodes) {
         if (nodes === undefined) {
-            return 0;
+            return 0 /* None */;
         }
-        var subtreeFlags = 0;
-        var nodeArrayFlags = 0;
-        for (var _i = 0, nodes_3 = nodes; _i < nodes_3.length; _i++) {
-            var node = nodes_3[_i];
+        var subtreeFlags = 0 /* None */;
+        var nodeArrayFlags = 0 /* None */;
+        for (var _i = 0, nodes_2 = nodes; _i < nodes_2.length; _i++) {
+            var node = nodes_2[_i];
             subtreeFlags |= aggregateTransformFlagsForNode(node);
-            nodeArrayFlags |= node.transformFlags & ~536870912;
+            nodeArrayFlags |= node.transformFlags & ~536870912 /* HasComputedFlags */;
         }
-        nodes.transformFlags = nodeArrayFlags | 536870912;
+        nodes.transformFlags = nodeArrayFlags | 536870912 /* HasComputedFlags */;
         return subtreeFlags;
     }
+    /**
+     * Aggregates the transform flags for the subtree of a node.
+     */
     function aggregateTransformFlagsForSubtree(node) {
-        if (ts.hasModifier(node, 2) || (ts.isTypeNode(node) && node.kind !== 207)) {
-            return 0;
+        // We do not transform ambient declarations or types, so there is no need to
+        // recursively aggregate transform flags.
+        if (ts.hasModifier(node, 2 /* Ambient */) || (ts.isTypeNode(node) && node.kind !== 207 /* ExpressionWithTypeArguments */)) {
+            return 0 /* None */;
         }
-        return reduceEachChild(node, 0, aggregateTransformFlagsForChildNode, aggregateTransformFlagsForChildNodes);
+        // Aggregate the transform flags of each child.
+        return reduceEachChild(node, 0 /* None */, aggregateTransformFlagsForChildNode, aggregateTransformFlagsForChildNodes);
     }
+    /**
+     * Aggregates the TransformFlags of a child node with the TransformFlags of its
+     * siblings.
+     */
     function aggregateTransformFlagsForChildNode(transformFlags, node) {
         return transformFlags | aggregateTransformFlagsForNode(node);
     }
@@ -49806,30 +60284,34 @@ var ts;
             return Debug.fail((message || "Unexpected node.") + "\r\nNode " + ts.formatSyntaxKind(node.kind) + " was unexpected.", failBadSyntaxKind);
         }
         Debug.failBadSyntaxKind = failBadSyntaxKind;
-        Debug.assertEachNode = Debug.shouldAssert(1)
+        Debug.assertEachNode = Debug.shouldAssert(1 /* Normal */)
             ? function (nodes, test, message) { return Debug.assert(test === undefined || ts.every(nodes, test), message || "Unexpected node.", function () { return "Node array did not pass test '" + Debug.getFunctionName(test) + "'."; }, Debug.assertEachNode); }
             : ts.noop;
-        Debug.assertNode = Debug.shouldAssert(1)
+        Debug.assertNode = Debug.shouldAssert(1 /* Normal */)
             ? function (node, test, message) { return Debug.assert(test === undefined || test(node), message || "Unexpected node.", function () { return "Node " + ts.formatSyntaxKind(node.kind) + " did not pass test '" + Debug.getFunctionName(test) + "'."; }, Debug.assertNode); }
             : ts.noop;
-        Debug.assertOptionalNode = Debug.shouldAssert(1)
+        Debug.assertOptionalNode = Debug.shouldAssert(1 /* Normal */)
             ? function (node, test, message) { return Debug.assert(test === undefined || node === undefined || test(node), message || "Unexpected node.", function () { return "Node " + ts.formatSyntaxKind(node.kind) + " did not pass test '" + Debug.getFunctionName(test) + "'."; }, Debug.assertOptionalNode); }
             : ts.noop;
-        Debug.assertOptionalToken = Debug.shouldAssert(1)
+        Debug.assertOptionalToken = Debug.shouldAssert(1 /* Normal */)
             ? function (node, kind, message) { return Debug.assert(kind === undefined || node === undefined || node.kind === kind, message || "Unexpected node.", function () { return "Node " + ts.formatSyntaxKind(node.kind) + " was not a '" + ts.formatSyntaxKind(kind) + "' token."; }, Debug.assertOptionalToken); }
             : ts.noop;
-        Debug.assertMissingNode = Debug.shouldAssert(1)
+        Debug.assertMissingNode = Debug.shouldAssert(1 /* Normal */)
             ? function (node, message) { return Debug.assert(node === undefined, message || "Unexpected node.", function () { return "Node " + ts.formatSyntaxKind(node.kind) + " was unexpected'."; }, Debug.assertMissingNode); }
             : ts.noop;
+        /**
+         * Injects debug information into frequently used types.
+         */
         function enableDebugInfo() {
             if (isDebugInfoEnabled)
                 return;
+            // Add additional properties in debug mode to assist with debugging.
             Object.defineProperties(ts.objectAllocator.getSymbolConstructor().prototype, {
                 __debugFlags: { get: function () { return ts.formatSymbolFlags(this.flags); } }
             });
             Object.defineProperties(ts.objectAllocator.getTypeConstructor().prototype, {
                 __debugFlags: { get: function () { return ts.formatTypeFlags(this.flags); } },
-                __debugObjectFlags: { get: function () { return this.flags & 131072 ? ts.formatObjectFlags(this.objectFlags) : ""; } },
+                __debugObjectFlags: { get: function () { return this.flags & 131072 /* Object */ ? ts.formatObjectFlags(this.objectFlags) : ""; } },
                 __debugTypeToString: { value: function () { return this.checker.typeToString(this); } },
             });
             var nodeConstructors = [
@@ -49863,6 +60345,7 @@ var ts;
         Debug.enableDebugInfo = enableDebugInfo;
     })(Debug = ts.Debug || (ts.Debug = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     function getOriginalNodeId(node) {
@@ -49878,12 +60361,12 @@ var ts;
         return ts.some(node.elements, isNamedDefaultReference);
     }
     function isNamedDefaultReference(e) {
-        return e.propertyName !== undefined && e.propertyName.escapedText === "default";
+        return e.propertyName !== undefined && e.propertyName.escapedText === "default" /* Default */;
     }
     function chainBundle(transformSourceFile) {
         return transformSourceFileOrBundle;
         function transformSourceFileOrBundle(node) {
-            return node.kind === 274 ? transformSourceFile(node) : transformBundle(node);
+            return node.kind === 274 /* SourceFile */ ? transformSourceFile(node) : transformBundle(node);
         }
         function transformBundle(node) {
             return ts.createBundle(ts.map(node.sourceFiles, transformSourceFile), node.prepends);
@@ -49907,11 +60390,13 @@ var ts;
                 defaultRefCount++;
             }
         }
+        // Import star is required if there's default named refs mixed with non-default refs, or if theres non-default refs and it has a default import
         return (defaultRefCount > 0 && defaultRefCount !== bindings.elements.length) || (!!(bindings.elements.length - defaultRefCount) && ts.isDefaultImport(node));
     }
     ts.getImportNeedsImportStarHelper = getImportNeedsImportStarHelper;
     function getImportNeedsImportDefaultHelper(node) {
-        return !getImportNeedsImportStarHelper(node) && (ts.isDefaultImport(node) || (!!node.importClause && ts.isNamedImports(node.importClause.namedBindings) && containsDefaultReference(node.importClause.namedBindings)));
+        // Import default is needed if there's a default import or a default ref and no other refs (meaning an import star helper wasn't requested)
+        return !getImportNeedsImportStarHelper(node) && (ts.isDefaultImport(node) || (!!node.importClause && ts.isNamedImports(node.importClause.namedBindings) && containsDefaultReference(node.importClause.namedBindings))); // TODO: GH#18217
     }
     ts.getImportNeedsImportDefaultHelper = getImportNeedsImportDefaultHelper;
     function collectExternalModuleInfo(sourceFile, resolver, compilerOptions) {
@@ -49927,26 +60412,34 @@ var ts;
         for (var _i = 0, _a = sourceFile.statements; _i < _a.length; _i++) {
             var node = _a[_i];
             switch (node.kind) {
-                case 244:
+                case 244 /* ImportDeclaration */:
+                    // import "mod"
+                    // import x from "mod"
+                    // import * as x from "mod"
+                    // import { x, y } from "mod"
                     externalImports.push(node);
                     hasImportStarOrImportDefault = hasImportStarOrImportDefault || getImportNeedsImportStarHelper(node) || getImportNeedsImportDefaultHelper(node);
                     break;
-                case 243:
-                    if (node.moduleReference.kind === 254) {
+                case 243 /* ImportEqualsDeclaration */:
+                    if (node.moduleReference.kind === 254 /* ExternalModuleReference */) {
+                        // import x = require("mod")
                         externalImports.push(node);
                     }
                     break;
-                case 250:
+                case 250 /* ExportDeclaration */:
                     if (node.moduleSpecifier) {
                         if (!node.exportClause) {
+                            // export * from "mod"
                             externalImports.push(node);
                             hasExportStarsToExportValues = true;
                         }
                         else {
+                            // export { x, y } from "mod"
                             externalImports.push(node);
                         }
                     }
                     else {
+                        // export { x, y }
                         for (var _b = 0, _c = node.exportClause.elements; _b < _c.length; _b++) {
                             var specifier = _c[_b];
                             if (!uniqueExports.get(ts.idText(specifier.name))) {
@@ -49963,28 +60456,31 @@ var ts;
                         }
                     }
                     break;
-                case 249:
+                case 249 /* ExportAssignment */:
                     if (node.isExportEquals && !exportEquals) {
+                        // export = x
                         exportEquals = node;
                     }
                     break;
-                case 214:
-                    if (ts.hasModifier(node, 1)) {
+                case 214 /* VariableStatement */:
+                    if (ts.hasModifier(node, 1 /* Export */)) {
                         for (var _d = 0, _e = node.declarationList.declarations; _d < _e.length; _d++) {
                             var decl = _e[_d];
                             exportedNames = collectExportedVariableInfo(decl, uniqueExports, exportedNames);
                         }
                     }
                     break;
-                case 234:
-                    if (ts.hasModifier(node, 1)) {
-                        if (ts.hasModifier(node, 512)) {
+                case 234 /* FunctionDeclaration */:
+                    if (ts.hasModifier(node, 1 /* Export */)) {
+                        if (ts.hasModifier(node, 512 /* Default */)) {
+                            // export default function() { }
                             if (!hasExportDefault) {
                                 multiMapSparseArrayAdd(exportedBindings, getOriginalNodeId(node), ts.getDeclarationName(node));
                                 hasExportDefault = true;
                             }
                         }
                         else {
+                            // export function x() { }
                             var name = node.name;
                             if (!uniqueExports.get(ts.idText(name))) {
                                 multiMapSparseArrayAdd(exportedBindings, getOriginalNodeId(node), name);
@@ -49994,15 +60490,17 @@ var ts;
                         }
                     }
                     break;
-                case 235:
-                    if (ts.hasModifier(node, 1)) {
-                        if (ts.hasModifier(node, 512)) {
+                case 235 /* ClassDeclaration */:
+                    if (ts.hasModifier(node, 1 /* Export */)) {
+                        if (ts.hasModifier(node, 512 /* Default */)) {
+                            // export default class { }
                             if (!hasExportDefault) {
                                 multiMapSparseArrayAdd(exportedBindings, getOriginalNodeId(node), ts.getDeclarationName(node));
                                 hasExportDefault = true;
                             }
                         }
                         else {
+                            // export class x { }
                             var name = node.name;
                             if (name && !uniqueExports.get(ts.idText(name))) {
                                 multiMapSparseArrayAdd(exportedBindings, getOriginalNodeId(node), name);
@@ -50015,9 +60513,11 @@ var ts;
             }
         }
         var externalHelpersModuleName = ts.getOrCreateExternalHelpersModuleNameIfNeeded(sourceFile, compilerOptions, hasExportStarsToExportValues, hasImportStarOrImportDefault);
-        var externalHelpersImportDeclaration = externalHelpersModuleName && ts.createImportDeclaration(undefined, undefined, ts.createImportClause(undefined, ts.createNamespaceImport(externalHelpersModuleName)), ts.createLiteral(ts.externalHelpersModuleNameText));
+        var externalHelpersImportDeclaration = externalHelpersModuleName && ts.createImportDeclaration(
+        /*decorators*/ undefined, 
+        /*modifiers*/ undefined, ts.createImportClause(/*name*/ undefined, ts.createNamespaceImport(externalHelpersModuleName)), ts.createLiteral(ts.externalHelpersModuleNameText));
         if (externalHelpersImportDeclaration) {
-            ts.addEmitFlags(externalHelpersImportDeclaration, 67108864);
+            ts.addEmitFlags(externalHelpersImportDeclaration, 67108864 /* NeverApplyImportHelper */);
             externalImports.unshift(externalHelpersImportDeclaration);
         }
         return { externalImports: externalImports, exportSpecifiers: exportSpecifiers, exportEquals: exportEquals, hasExportStarsToExportValues: hasExportStarsToExportValues, exportedBindings: exportedBindings, exportedNames: exportedNames, externalHelpersImportDeclaration: externalHelpersImportDeclaration };
@@ -50041,6 +60541,7 @@ var ts;
         }
         return exportedNames;
     }
+    /** Use a sparse array as a multi-map. */
     function multiMapSparseArrayAdd(map, key, value) {
         var values = map[key];
         if (values) {
@@ -50051,13 +60552,22 @@ var ts;
         }
         return values;
     }
+    /**
+     * Used in the module transformer to check if an expression is reasonably without sideeffect,
+     *  and thus better to copy into multiple places rather than to cache in a temporary variable
+     *  - this is mostly subjective beyond the requirement that the expression not be sideeffecting
+     */
     function isSimpleCopiableExpression(expression) {
         return ts.isStringLiteralLike(expression) ||
-            expression.kind === 8 ||
+            expression.kind === 8 /* NumericLiteral */ ||
             ts.isKeyword(expression.kind) ||
             ts.isIdentifier(expression);
     }
     ts.isSimpleCopiableExpression = isSimpleCopiableExpression;
+    /**
+     * @param input Template string input strings
+     * @param args Names which need to be made file-level unique
+     */
     function helperString(input) {
         var args = [];
         for (var _i = 1; _i < arguments.length; _i++) {
@@ -50075,6 +60585,7 @@ var ts;
     }
     ts.helperString = helperString;
 })(ts || (ts = {}));
+/*@internal*/
 var ts;
 (function (ts) {
     var FlattenLevel;
@@ -50082,6 +60593,17 @@ var ts;
         FlattenLevel[FlattenLevel["All"] = 0] = "All";
         FlattenLevel[FlattenLevel["ObjectRest"] = 1] = "ObjectRest";
     })(FlattenLevel = ts.FlattenLevel || (ts.FlattenLevel = {}));
+    /**
+     * Flattens a DestructuringAssignment or a VariableDeclaration to an expression.
+     *
+     * @param node The node to flatten.
+     * @param visitor An optional visitor used to visit initializers.
+     * @param context The transformation context.
+     * @param level Indicates the extent to which flattening should occur.
+     * @param needsValue An optional value indicating whether the value from the right-hand-side of
+     * the destructuring assignment is needed as part of a larger expression.
+     * @param createAssignmentCallback An optional callback used to create the assignment expression.
+     */
     function flattenDestructuringAssignment(node, visitor, context, level, needsValue, createAssignmentCallback) {
         var location = node;
         var value;
@@ -50113,16 +60635,30 @@ var ts;
         if (value) {
             value = ts.visitNode(value, visitor, ts.isExpression);
             if (ts.isIdentifier(value) && bindingOrAssignmentElementAssignsToName(node, value.escapedText)) {
-                value = ensureIdentifier(flattenContext, value, false, location);
+                // If the right-hand value of the assignment is also an assignment target then
+                // we need to cache the right-hand value.
+                value = ensureIdentifier(flattenContext, value, /*reuseIdentifierExpressions*/ false, location);
             }
             else if (needsValue) {
-                value = ensureIdentifier(flattenContext, value, true, location);
+                // If the right-hand value of the destructuring assignment needs to be preserved (as
+                // is the case when the destructuring assignment is part of a larger expression),
+                // then we need to cache the right-hand value.
+                //
+                // The source map location for the assignment should point to the entire binary
+                // expression.
+                value = ensureIdentifier(flattenContext, value, /*reuseIdentifierExpressions*/ true, location);
             }
             else if (ts.nodeIsSynthesized(node)) {
+                // Generally, the source map location for a destructuring assignment is the root
+                // expression.
+                //
+                // However, if the root expression is synthesized (as in the case
+                // of the initializer when transforming a ForOfStatement), then the source map
+                // location should point to the right-hand value of the expression.
                 location = value;
             }
         }
-        flattenBindingOrAssignmentElement(flattenContext, node, value, location, ts.isDestructuringAssignment(node));
+        flattenBindingOrAssignmentElement(flattenContext, node, value, location, /*skipInitializer*/ ts.isDestructuringAssignment(node));
         if (value && needsValue) {
             if (!ts.some(expressions)) {
                 return value;
@@ -50131,7 +60667,9 @@ var ts;
         }
         return ts.aggregateTransformFlags(ts.inlineExpressions(expressions)) || ts.createOmittedExpression();
         function emitExpression(expression) {
-            ts.setEmitFlags(expression, 64);
+            // NOTE: this completely disables source maps, but aligns with the behavior of
+            //       `emitAssignment` in the old emitter.
+            ts.setEmitFlags(expression, 64 /* NoNestedSourceMaps */);
             ts.aggregateTransformFlags(expression);
             expressions = ts.append(expressions, expression);
         }
@@ -50146,7 +60684,7 @@ var ts;
     }
     ts.flattenDestructuringAssignment = flattenDestructuringAssignment;
     function bindingOrAssignmentElementAssignsToName(element, escapedName) {
-        var target = ts.getTargetOfBindingOrAssignmentElement(element);
+        var target = ts.getTargetOfBindingOrAssignmentElement(element); // TODO: GH#18217
         if (ts.isBindingOrAssignmentPattern(target)) {
             return bindingOrAssignmentPatternAssignsToName(target, escapedName);
         }
@@ -50165,6 +60703,17 @@ var ts;
         }
         return false;
     }
+    /**
+     * Flattens a VariableDeclaration or ParameterDeclaration to one or more variable declarations.
+     *
+     * @param node The node to flatten.
+     * @param visitor An optional visitor used to visit initializers.
+     * @param context The transformation context.
+     * @param boundValue The value bound to the declaration.
+     * @param skipInitializer A value indicating whether to ignore the initializer of `node`.
+     * @param hoistTempVariables Indicates whether temporary variables should not be recorded in-line.
+     * @param level Indicates the extent to which flattening should occur.
+     */
     function flattenDestructuringBinding(node, visitor, context, level, rval, hoistTempVariables, skipInitializer) {
         if (hoistTempVariables === void 0) { hoistTempVariables = false; }
         var pendingExpressions;
@@ -50185,17 +60734,19 @@ var ts;
         if (ts.isVariableDeclaration(node)) {
             var initializer = ts.getInitializerOfBindingOrAssignmentElement(node);
             if (initializer && ts.isIdentifier(initializer) && bindingOrAssignmentElementAssignsToName(node, initializer.escapedText)) {
-                initializer = ensureIdentifier(flattenContext, initializer, false, initializer);
+                // If the right-hand value of the assignment is also an assignment target then
+                // we need to cache the right-hand value.
+                initializer = ensureIdentifier(flattenContext, initializer, /*reuseIdentifierExpressions*/ false, initializer);
                 node = ts.updateVariableDeclaration(node, node.name, node.type, initializer);
             }
         }
         flattenBindingOrAssignmentElement(flattenContext, node, rval, node, skipInitializer);
         if (pendingExpressions) {
-            var temp = ts.createTempVariable(undefined);
+            var temp = ts.createTempVariable(/*recordTempVariable*/ undefined);
             if (hoistTempVariables) {
                 var value = ts.inlineExpressions(pendingExpressions);
                 pendingExpressions = undefined;
-                emitBindingOrAssignment(temp, value, undefined, undefined);
+                emitBindingOrAssignment(temp, value, /*location*/ undefined, /*original*/ undefined);
             }
             else {
                 context.hoistVariableDeclaration(temp);
@@ -50207,11 +60758,12 @@ var ts;
         }
         for (var _i = 0, pendingDeclarations_1 = pendingDeclarations; _i < pendingDeclarations_1.length; _i++) {
             var _a = pendingDeclarations_1[_i], pendingExpressions_1 = _a.pendingExpressions, name = _a.name, value = _a.value, location = _a.location, original = _a.original;
-            var variable = ts.createVariableDeclaration(name, undefined, pendingExpressions_1 ? ts.inlineExpressions(ts.append(pendingExpressions_1, value)) : value);
+            var variable = ts.createVariableDeclaration(name, 
+            /*type*/ undefined, pendingExpressions_1 ? ts.inlineExpressions(ts.append(pendingExpressions_1, value)) : value);
             variable.original = original;
             ts.setTextRange(variable, location);
             if (ts.isIdentifier(name)) {
-                ts.setEmitFlags(variable, 64);
+                ts.setEmitFlags(variable, 64 /* NoNestedSourceMaps */);
             }
             ts.aggregateTransformFlags(variable);
             declarations.push(variable);
@@ -50230,17 +60782,29 @@ var ts;
         }
     }
     ts.flattenDestructuringBinding = flattenDestructuringBinding;
+    /**
+     * Flattens a BindingOrAssignmentElement into zero or more bindings or assignments.
+     *
+     * @param flattenContext Options used to control flattening.
+     * @param element The element to flatten.
+     * @param value The current RHS value to assign to the element.
+     * @param location The location to use for source maps and comments.
+     * @param skipInitializer An optional value indicating whether to include the initializer
+     * for the element.
+     */
     function flattenBindingOrAssignmentElement(flattenContext, element, value, location, skipInitializer) {
         if (!skipInitializer) {
             var initializer = ts.visitNode(ts.getInitializerOfBindingOrAssignmentElement(element), flattenContext.visitor, ts.isExpression);
             if (initializer) {
+                // Combine value and initializer
                 value = value ? createDefaultValueCheck(flattenContext, value, initializer, location) : initializer;
             }
             else if (!value) {
+                // Use 'void 0' in absence of value and initializer
                 value = ts.createVoidZero();
             }
         }
-        var bindingTarget = ts.getTargetOfBindingOrAssignmentElement(element);
+        var bindingTarget = ts.getTargetOfBindingOrAssignmentElement(element); // TODO: GH#18217
         if (ts.isObjectBindingOrAssignmentPattern(bindingTarget)) {
             flattenObjectBindingOrAssignmentPattern(flattenContext, element, bindingTarget, value, location);
         }
@@ -50248,13 +60812,26 @@ var ts;
             flattenArrayBindingOrAssignmentPattern(flattenContext, element, bindingTarget, value, location);
         }
         else {
-            flattenContext.emitBindingOrAssignment(bindingTarget, value, location, element);
+            flattenContext.emitBindingOrAssignment(bindingTarget, value, location, /*original*/ element); // TODO: GH#18217
         }
     }
+    /**
+     * Flattens an ObjectBindingOrAssignmentPattern into zero or more bindings or assignments.
+     *
+     * @param flattenContext Options used to control flattening.
+     * @param parent The parent element of the pattern.
+     * @param pattern The ObjectBindingOrAssignmentPattern to flatten.
+     * @param value The current RHS value to assign to the element.
+     * @param location The location to use for source maps and comments.
+     */
     function flattenObjectBindingOrAssignmentPattern(flattenContext, parent, pattern, value, location) {
         var elements = ts.getElementsOfBindingOrAssignmentPattern(pattern);
         var numElements = elements.length;
         if (numElements !== 1) {
+            // For anything other than a single-element destructuring we need to generate a temporary
+            // to ensure value is evaluated exactly once. Additionally, if we have zero elements
+            // we need to emit *something* to ensure that in case a 'var' keyword was already emitted,
+            // so in that case, we'll intentionally create that temporary.
             var reuseIdentifierExpressions = !ts.isDeclarationBindingElement(parent) || numElements !== 0;
             value = ensureIdentifier(flattenContext, value, reuseIdentifierExpressions, location);
         }
@@ -50264,9 +60841,9 @@ var ts;
             var element = elements[i];
             if (!ts.getRestIndicatorOfBindingOrAssignmentElement(element)) {
                 var propertyName = ts.getPropertyNameOfBindingOrAssignmentElement(element);
-                if (flattenContext.level >= 1
-                    && !(element.transformFlags & (524288 | 1048576))
-                    && !(ts.getTargetOfBindingOrAssignmentElement(element).transformFlags & (524288 | 1048576))
+                if (flattenContext.level >= 1 /* ObjectRest */
+                    && !(element.transformFlags & (524288 /* ContainsRest */ | 1048576 /* ContainsObjectRest */))
+                    && !(ts.getTargetOfBindingOrAssignmentElement(element).transformFlags & (524288 /* ContainsRest */ | 1048576 /* ContainsObjectRest */))
                     && !ts.isComputedPropertyName(propertyName)) {
                     bindingElements = ts.append(bindingElements, element);
                 }
@@ -50279,7 +60856,7 @@ var ts;
                     if (ts.isComputedPropertyName(propertyName)) {
                         computedTempVariables = ts.append(computedTempVariables, rhsValue.argumentExpression);
                     }
-                    flattenBindingOrAssignmentElement(flattenContext, element, rhsValue, element);
+                    flattenBindingOrAssignmentElement(flattenContext, element, rhsValue, /*location*/ element);
                 }
             }
             else if (i === numElements - 1) {
@@ -50287,7 +60864,7 @@ var ts;
                     flattenContext.emitBindingOrAssignment(flattenContext.createObjectBindingOrAssignmentPattern(bindingElements), value, location, pattern);
                     bindingElements = undefined;
                 }
-                var rhsValue = createRestCall(flattenContext.context, value, elements, computedTempVariables, pattern);
+                var rhsValue = createRestCall(flattenContext.context, value, elements, computedTempVariables, pattern); // TODO: GH#18217
                 flattenBindingOrAssignmentElement(flattenContext, element, rhsValue, element);
             }
         }
@@ -50295,16 +60872,33 @@ var ts;
             flattenContext.emitBindingOrAssignment(flattenContext.createObjectBindingOrAssignmentPattern(bindingElements), value, location, pattern);
         }
     }
+    /**
+     * Flattens an ArrayBindingOrAssignmentPattern into zero or more bindings or assignments.
+     *
+     * @param flattenContext Options used to control flattening.
+     * @param parent The parent element of the pattern.
+     * @param pattern The ArrayBindingOrAssignmentPattern to flatten.
+     * @param value The current RHS value to assign to the element.
+     * @param location The location to use for source maps and comments.
+     */
     function flattenArrayBindingOrAssignmentPattern(flattenContext, parent, pattern, value, location) {
         var elements = ts.getElementsOfBindingOrAssignmentPattern(pattern);
         var numElements = elements.length;
-        if (flattenContext.level < 1 && flattenContext.downlevelIteration) {
+        if (flattenContext.level < 1 /* ObjectRest */ && flattenContext.downlevelIteration) {
+            // Read the elements of the iterable into an array
             value = ensureIdentifier(flattenContext, ts.createReadHelper(flattenContext.context, value, numElements > 0 && ts.getRestIndicatorOfBindingOrAssignmentElement(elements[numElements - 1])
                 ? undefined
-                : numElements, location), false, location);
+                : numElements, location), 
+            /*reuseIdentifierExpressions*/ false, location);
         }
-        else if (numElements !== 1 && (flattenContext.level < 1 || numElements === 0)
+        else if (numElements !== 1 && (flattenContext.level < 1 /* ObjectRest */ || numElements === 0)
             || ts.every(elements, ts.isOmittedExpression)) {
+            // For anything other than a single-element destructuring we need to generate a temporary
+            // to ensure value is evaluated exactly once. Additionally, if we have zero elements
+            // we need to emit *something* to ensure that in case a 'var' keyword was already emitted,
+            // so in that case, we'll intentionally create that temporary.
+            // Or all the elements of the binding pattern are omitted expression such as "var [,] = [1,2]",
+            // then we will create temporary variable.
             var reuseIdentifierExpressions = !ts.isDeclarationBindingElement(parent) || numElements !== 0;
             value = ensureIdentifier(flattenContext, value, reuseIdentifierExpressions, location);
         }
@@ -50312,9 +60906,11 @@ var ts;
         var restContainingElements;
         for (var i = 0; i < numElements; i++) {
             var element = elements[i];
-            if (flattenContext.level >= 1) {
-                if (element.transformFlags & 1048576) {
-                    var temp = ts.createTempVariable(undefined);
+            if (flattenContext.level >= 1 /* ObjectRest */) {
+                // If an array pattern contains an ObjectRest, we must cache the result so that we
+                // can perform the ObjectRest destructuring in a different declaration
+                if (element.transformFlags & 1048576 /* ContainsObjectRest */) {
+                    var temp = ts.createTempVariable(/*recordTempVariable*/ undefined);
                     if (flattenContext.hoistTempVariables) {
                         flattenContext.context.hoistVariableDeclaration(temp);
                     }
@@ -50330,11 +60926,11 @@ var ts;
             }
             else if (!ts.getRestIndicatorOfBindingOrAssignmentElement(element)) {
                 var rhsValue = ts.createElementAccess(value, i);
-                flattenBindingOrAssignmentElement(flattenContext, element, rhsValue, element);
+                flattenBindingOrAssignmentElement(flattenContext, element, rhsValue, /*location*/ element);
             }
             else if (i === numElements - 1) {
                 var rhsValue = ts.createArraySlice(value, i);
-                flattenBindingOrAssignmentElement(flattenContext, element, rhsValue, element);
+                flattenBindingOrAssignmentElement(flattenContext, element, rhsValue, /*location*/ element);
             }
         }
         if (bindingElements) {
@@ -50347,13 +60943,31 @@ var ts;
             }
         }
     }
+    /**
+     * Creates an expression used to provide a default value if a value is `undefined` at runtime.
+     *
+     * @param flattenContext Options used to control flattening.
+     * @param value The RHS value to test.
+     * @param defaultValue The default value to use if `value` is `undefined` at runtime.
+     * @param location The location to use for source maps and comments.
+     */
     function createDefaultValueCheck(flattenContext, value, defaultValue, location) {
-        value = ensureIdentifier(flattenContext, value, true, location);
+        value = ensureIdentifier(flattenContext, value, /*reuseIdentifierExpressions*/ true, location);
         return ts.createConditional(ts.createTypeCheck(value, "undefined"), defaultValue, value);
     }
+    /**
+     * Creates either a PropertyAccessExpression or an ElementAccessExpression for the
+     * right-hand side of a transformed destructuring assignment.
+     *
+     * @link https://tc39.github.io/ecma262/#sec-runtime-semantics-keyeddestructuringassignmentevaluation
+     *
+     * @param flattenContext Options used to control flattening.
+     * @param value The RHS value that is the source of the property.
+     * @param propertyName The destructuring property name.
+     */
     function createDestructuringPropertyAccess(flattenContext, value, propertyName) {
         if (ts.isComputedPropertyName(propertyName)) {
-            var argumentExpression = ensureIdentifier(flattenContext, ts.visitNode(propertyName.expression, flattenContext.visitor), false, propertyName);
+            var argumentExpression = ensureIdentifier(flattenContext, ts.visitNode(propertyName.expression, flattenContext.visitor), /*reuseIdentifierExpressions*/ false, /*location*/ propertyName);
             return ts.createElementAccess(value, argumentExpression);
         }
         else if (ts.isStringOrNumericLiteral(propertyName)) {
@@ -50366,18 +60980,29 @@ var ts;
             return ts.createPropertyAccess(value, name);
         }
     }
+    /**
+     * Ensures that there exists a declared identifier whose value holds the given expression.
+     * This function is useful to ensure that the expression's value can be read from in subsequent expressions.
+     * Unless 'reuseIdentifierExpressions' is false, 'value' will be returned if it is just an identifier.
+     *
+     * @param flattenContext Options used to control flattening.
+     * @param value the expression whose value needs to be bound.
+     * @param reuseIdentifierExpressions true if identifier expressions can simply be returned;
+     * false if it is necessary to always emit an identifier.
+     * @param location The location to use for source maps and comments.
+     */
     function ensureIdentifier(flattenContext, value, reuseIdentifierExpressions, location) {
         if (ts.isIdentifier(value) && reuseIdentifierExpressions) {
             return value;
         }
         else {
-            var temp = ts.createTempVariable(undefined);
+            var temp = ts.createTempVariable(/*recordTempVariable*/ undefined);
             if (flattenContext.hoistTempVariables) {
                 flattenContext.context.hoistVariableDeclaration(temp);
                 flattenContext.emitExpression(ts.setTextRange(ts.createAssignment(temp, value), location));
             }
             else {
-                flattenContext.emitBindingOrAssignment(temp, value, location, undefined);
+                flattenContext.emitBindingOrAssignment(temp, value, location, /*original*/ undefined);
             }
             return temp;
         }
@@ -50397,7 +61022,7 @@ var ts;
         return ts.createObjectLiteral(ts.map(elements, ts.convertToObjectAssignmentElement));
     }
     function makeBindingElement(name) {
-        return ts.createBindingElement(undefined, undefined, name);
+        return ts.createBindingElement(/*dotDotDotToken*/ undefined, /*propertyName*/ undefined, name);
     }
     function makeAssignmentElement(name) {
         return name;
@@ -50407,6 +61032,9 @@ var ts;
         scoped: false,
         text: "\n            var __rest = (this && this.__rest) || function (s, e) {\n                var t = {};\n                for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0)\n                    t[p] = s[p];\n                if (s != null && typeof Object.getOwnPropertySymbols === \"function\")\n                    for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) if (e.indexOf(p[i]) < 0)\n                        t[p[i]] = s[p[i]];\n                return t;\n            };"
     };
+    /** Given value: o, propName: p, pattern: { a, b, ...p } from the original statement
+     * `{ a, b, ...p } = o`, create `p = __rest(o, ["a", "b"]);`
+     */
     function createRestCall(context, value, elements, computedTempVariables, location) {
         context.requestEmitHelper(restHelper);
         var propertyNames = [];
@@ -50417,6 +61045,7 @@ var ts;
                 if (ts.isComputedPropertyName(propertyName)) {
                     var temp = computedTempVariables[computedTempVariableOffset];
                     computedTempVariableOffset++;
+                    // typeof _tmp === "symbol" ? _tmp : _tmp + ""
                     propertyNames.push(ts.createConditional(ts.createTypeCheck(temp, "symbol"), temp, ts.createAdd(temp, ts.createLiteral(""))));
                 }
                 else {
@@ -50424,19 +61053,27 @@ var ts;
                 }
             }
         }
-        return ts.createCall(ts.getHelperName("__rest"), undefined, [
+        return ts.createCall(ts.getHelperName("__rest"), 
+        /*typeArguments*/ undefined, [
             value,
             ts.setTextRange(ts.createArrayLiteral(propertyNames), location)
         ]);
     }
 })(ts || (ts = {}));
+/*@internal*/
 var ts;
 (function (ts) {
+    /**
+     * Indicates whether to emit type metadata in the new format.
+     */
     var USE_NEW_TYPE_METADATA_FORMAT = false;
     var TypeScriptSubstitutionFlags;
     (function (TypeScriptSubstitutionFlags) {
+        /** Enables substitutions for decorated classes. */
         TypeScriptSubstitutionFlags[TypeScriptSubstitutionFlags["ClassAliases"] = 1] = "ClassAliases";
+        /** Enables substitutions for namespace exports. */
         TypeScriptSubstitutionFlags[TypeScriptSubstitutionFlags["NamespaceExports"] = 2] = "NamespaceExports";
+        /* Enables substitutions for unqualified enum members */
         TypeScriptSubstitutionFlags[TypeScriptSubstitutionFlags["NonQualifiedEnumMembers"] = 8] = "NonQualifiedEnumMembers";
     })(TypeScriptSubstitutionFlags || (TypeScriptSubstitutionFlags = {}));
     var ClassFacts;
@@ -50462,36 +61099,61 @@ var ts;
         var strictNullChecks = ts.getStrictOptionValue(compilerOptions, "strictNullChecks");
         var languageVersion = ts.getEmitScriptTarget(compilerOptions);
         var moduleKind = ts.getEmitModuleKind(compilerOptions);
+        // Save the previous transformation hooks.
         var previousOnEmitNode = context.onEmitNode;
         var previousOnSubstituteNode = context.onSubstituteNode;
+        // Set new transformation hooks.
         context.onEmitNode = onEmitNode;
         context.onSubstituteNode = onSubstituteNode;
-        context.enableSubstitution(185);
-        context.enableSubstitution(186);
+        // Enable substitution for property/element access to emit const enum values.
+        context.enableSubstitution(185 /* PropertyAccessExpression */);
+        context.enableSubstitution(186 /* ElementAccessExpression */);
+        // These variables contain state that changes as we descend into the tree.
         var currentSourceFile;
         var currentNamespace;
         var currentNamespaceContainerName;
         var currentScope;
         var currentScopeFirstDeclarationsOfName;
+        /**
+         * Keeps track of whether expression substitution has been enabled for specific edge cases.
+         * They are persisted between each SourceFile transformation and should not be reset.
+         */
         var enabledSubstitutions;
+        /**
+         * A map that keeps track of aliases created for classes with decorators to avoid issues
+         * with the double-binding behavior of classes.
+         */
         var classAliases;
+        /**
+         * Keeps track of whether we are within any containing namespaces when performing
+         * just-in-time substitution while printing an expression identifier.
+         */
         var applicableSubstitutions;
+        /**
+         * Tracks what computed name expressions originating from elided names must be inlined
+         * at the next execution site, in document order
+         */
         var pendingExpressions;
         return transformSourceFileOrBundle;
         function transformSourceFileOrBundle(node) {
-            if (node.kind === 275) {
+            if (node.kind === 275 /* Bundle */) {
                 return transformBundle(node);
             }
             return transformSourceFile(node);
         }
         function transformBundle(node) {
             return ts.createBundle(node.sourceFiles.map(transformSourceFile), ts.mapDefined(node.prepends, function (prepend) {
-                if (prepend.kind === 277) {
-                    return ts.createUnparsedSourceFile(prepend.javascriptText);
+                if (prepend.kind === 277 /* InputFiles */) {
+                    return ts.createUnparsedSourceFile(prepend.javascriptText, prepend.javascriptMapText);
                 }
                 return prepend;
             }));
         }
+        /**
+         * Transform TypeScript-specific syntax in a SourceFile.
+         *
+         * @param node A SourceFile node.
+         */
         function transformSourceFile(node) {
             if (node.isDeclarationFile) {
                 return node;
@@ -50502,61 +61164,100 @@ var ts;
             currentSourceFile = undefined;
             return visited;
         }
+        /**
+         * Visits a node, saving and restoring state variables on the stack.
+         *
+         * @param node The node to visit.
+         */
         function saveStateAndInvoke(node, f) {
+            // Save state
             var savedCurrentScope = currentScope;
             var savedCurrentScopeFirstDeclarationsOfName = currentScopeFirstDeclarationsOfName;
+            // Handle state changes before visiting a node.
             onBeforeVisitNode(node);
             var visited = f(node);
+            // Restore state
             if (currentScope !== savedCurrentScope) {
                 currentScopeFirstDeclarationsOfName = savedCurrentScopeFirstDeclarationsOfName;
             }
             currentScope = savedCurrentScope;
             return visited;
         }
+        /**
+         * Performs actions that should always occur immediately before visiting a node.
+         *
+         * @param node The node to visit.
+         */
         function onBeforeVisitNode(node) {
             switch (node.kind) {
-                case 274:
-                case 241:
-                case 240:
-                case 213:
+                case 274 /* SourceFile */:
+                case 241 /* CaseBlock */:
+                case 240 /* ModuleBlock */:
+                case 213 /* Block */:
                     currentScope = node;
                     currentScopeFirstDeclarationsOfName = undefined;
                     break;
-                case 235:
-                case 234:
-                    if (ts.hasModifier(node, 2)) {
+                case 235 /* ClassDeclaration */:
+                case 234 /* FunctionDeclaration */:
+                    if (ts.hasModifier(node, 2 /* Ambient */)) {
                         break;
                     }
+                    // Record these declarations provided that they have a name.
                     if (node.name) {
                         recordEmittedDeclarationInScope(node);
                     }
                     else {
-                        ts.Debug.assert(node.kind === 235 || ts.hasModifier(node, 512));
+                        // These nodes should always have names unless they are default-exports;
+                        // however, class declaration parsing allows for undefined names, so syntactically invalid
+                        // programs may also have an undefined name.
+                        ts.Debug.assert(node.kind === 235 /* ClassDeclaration */ || ts.hasModifier(node, 512 /* Default */));
                     }
                     break;
             }
         }
+        /**
+         * General-purpose node visitor.
+         *
+         * @param node The node to visit.
+         */
         function visitor(node) {
             return saveStateAndInvoke(node, visitorWorker);
         }
+        /**
+         * Visits and possibly transforms any node.
+         *
+         * @param node The node to visit.
+         */
         function visitorWorker(node) {
-            if (node.transformFlags & 1) {
+            if (node.transformFlags & 1 /* TypeScript */) {
+                // This node is explicitly marked as TypeScript, so we should transform the node.
                 return visitTypeScript(node);
             }
-            else if (node.transformFlags & 2) {
+            else if (node.transformFlags & 2 /* ContainsTypeScript */) {
+                // This node contains TypeScript, so we should visit its children.
                 return ts.visitEachChild(node, visitor, context);
             }
             return node;
         }
+        /**
+         * Specialized visitor that visits the immediate children of a SourceFile.
+         *
+         * @param node The node to visit.
+         */
         function sourceElementVisitor(node) {
             return saveStateAndInvoke(node, sourceElementVisitorWorker);
         }
+        /**
+         * Specialized visitor that visits the immediate children of a SourceFile.
+         *
+         * @param node The node to visit.
+         */
         function sourceElementVisitorWorker(node) {
             switch (node.kind) {
-                case 244:
-                case 243:
-                case 249:
-                case 250:
+                case 244 /* ImportDeclaration */:
+                case 243 /* ImportEqualsDeclaration */:
+                case 249 /* ExportAssignment */:
+                case 250 /* ExportDeclaration */:
                     return visitEllidableStatement(node);
                 default:
                     return visitorWorker(node);
@@ -50565,168 +61266,265 @@ var ts;
         function visitEllidableStatement(node) {
             var parsed = ts.getParseTreeNode(node);
             if (parsed !== node) {
-                if (node.transformFlags & 2) {
+                // If the node has been transformed by a `before` transformer, perform no ellision on it
+                // As the type information we would attempt to lookup to perform ellision is potentially unavailable for the synthesized nodes
+                // We do not reuse `visitorWorker`, as the ellidable statement syntax kinds are technically unrecognized by the switch-case in `visitTypeScript`,
+                // and will trigger debug failures when debug verbosity is turned up
+                if (node.transformFlags & 2 /* ContainsTypeScript */) {
+                    // This node contains TypeScript, so we should visit its children.
                     return ts.visitEachChild(node, visitor, context);
                 }
+                // Otherwise, we can just return the node
                 return node;
             }
             switch (node.kind) {
-                case 244:
+                case 244 /* ImportDeclaration */:
                     return visitImportDeclaration(node);
-                case 243:
+                case 243 /* ImportEqualsDeclaration */:
                     return visitImportEqualsDeclaration(node);
-                case 249:
+                case 249 /* ExportAssignment */:
                     return visitExportAssignment(node);
-                case 250:
+                case 250 /* ExportDeclaration */:
                     return visitExportDeclaration(node);
                 default:
                     ts.Debug.fail("Unhandled ellided statement");
             }
         }
+        /**
+         * Specialized visitor that visits the immediate children of a namespace.
+         *
+         * @param node The node to visit.
+         */
         function namespaceElementVisitor(node) {
             return saveStateAndInvoke(node, namespaceElementVisitorWorker);
         }
+        /**
+         * Specialized visitor that visits the immediate children of a namespace.
+         *
+         * @param node The node to visit.
+         */
         function namespaceElementVisitorWorker(node) {
-            if (node.kind === 250 ||
-                node.kind === 244 ||
-                node.kind === 245 ||
-                (node.kind === 243 &&
-                    node.moduleReference.kind === 254)) {
+            if (node.kind === 250 /* ExportDeclaration */ ||
+                node.kind === 244 /* ImportDeclaration */ ||
+                node.kind === 245 /* ImportClause */ ||
+                (node.kind === 243 /* ImportEqualsDeclaration */ &&
+                    node.moduleReference.kind === 254 /* ExternalModuleReference */)) {
+                // do not emit ES6 imports and exports since they are illegal inside a namespace
                 return undefined;
             }
-            else if (node.transformFlags & 1 || ts.hasModifier(node, 1)) {
+            else if (node.transformFlags & 1 /* TypeScript */ || ts.hasModifier(node, 1 /* Export */)) {
+                // This node is explicitly marked as TypeScript, or is exported at the namespace
+                // level, so we should transform the node.
                 return visitTypeScript(node);
             }
-            else if (node.transformFlags & 2) {
+            else if (node.transformFlags & 2 /* ContainsTypeScript */) {
+                // This node contains TypeScript, so we should visit its children.
                 return ts.visitEachChild(node, visitor, context);
             }
             return node;
         }
+        /**
+         * Specialized visitor that visits the immediate children of a class with TypeScript syntax.
+         *
+         * @param node The node to visit.
+         */
         function classElementVisitor(node) {
             return saveStateAndInvoke(node, classElementVisitorWorker);
         }
+        /**
+         * Specialized visitor that visits the immediate children of a class with TypeScript syntax.
+         *
+         * @param node The node to visit.
+         */
         function classElementVisitorWorker(node) {
             switch (node.kind) {
-                case 155:
+                case 155 /* Constructor */:
+                    // TypeScript constructors are transformed in `visitClassDeclaration`.
+                    // We elide them here as `visitorWorker` checks transform flags, which could
+                    // erronously include an ES6 constructor without TypeScript syntax.
                     return undefined;
-                case 152:
-                case 160:
-                case 156:
-                case 157:
-                case 154:
+                case 152 /* PropertyDeclaration */:
+                case 160 /* IndexSignature */:
+                case 156 /* GetAccessor */:
+                case 157 /* SetAccessor */:
+                case 154 /* MethodDeclaration */:
+                    // Fallback to the default visit behavior.
                     return visitorWorker(node);
-                case 212:
+                case 212 /* SemicolonClassElement */:
                     return node;
                 default:
                     return ts.Debug.failBadSyntaxKind(node);
             }
         }
         function modifierVisitor(node) {
-            if (ts.modifierToFlag(node.kind) & 2270) {
+            if (ts.modifierToFlag(node.kind) & 2270 /* TypeScriptModifier */) {
                 return undefined;
             }
-            else if (currentNamespace && node.kind === 84) {
+            else if (currentNamespace && node.kind === 84 /* ExportKeyword */) {
                 return undefined;
             }
             return node;
         }
+        /**
+         * Branching visitor, visits a TypeScript syntax node.
+         *
+         * @param node The node to visit.
+         */
         function visitTypeScript(node) {
-            if (ts.hasModifier(node, 2) && ts.isStatement(node)) {
+            if (ts.hasModifier(node, 2 /* Ambient */) && ts.isStatement(node)) {
+                // TypeScript ambient declarations are elided, but some comments may be preserved.
+                // See the implementation of `getLeadingComments` in comments.ts for more details.
                 return ts.createNotEmittedStatement(node);
             }
             switch (node.kind) {
-                case 84:
-                case 79:
+                case 84 /* ExportKeyword */:
+                case 79 /* DefaultKeyword */:
+                    // ES6 export and default modifiers are elided when inside a namespace.
                     return currentNamespace ? undefined : node;
-                case 114:
-                case 112:
-                case 113:
-                case 117:
-                case 76:
-                case 124:
-                case 132:
-                case 167:
-                case 168:
-                case 166:
-                case 161:
-                case 148:
-                case 119:
-                case 142:
-                case 122:
-                case 137:
-                case 134:
-                case 131:
-                case 105:
-                case 138:
-                case 164:
-                case 163:
-                case 165:
-                case 162:
-                case 169:
-                case 170:
-                case 171:
-                case 173:
-                case 174:
-                case 175:
-                case 176:
-                case 177:
-                case 178:
-                case 160:
-                case 150:
-                case 237:
+                case 114 /* PublicKeyword */:
+                case 112 /* PrivateKeyword */:
+                case 113 /* ProtectedKeyword */:
+                case 117 /* AbstractKeyword */:
+                case 76 /* ConstKeyword */:
+                case 124 /* DeclareKeyword */:
+                case 132 /* ReadonlyKeyword */:
+                // TypeScript accessibility and readonly modifiers are elided.
+                case 167 /* ArrayType */:
+                case 168 /* TupleType */:
+                case 166 /* TypeLiteral */:
+                case 161 /* TypePredicate */:
+                case 148 /* TypeParameter */:
+                case 119 /* AnyKeyword */:
+                case 142 /* UnknownKeyword */:
+                case 122 /* BooleanKeyword */:
+                case 137 /* StringKeyword */:
+                case 134 /* NumberKeyword */:
+                case 131 /* NeverKeyword */:
+                case 105 /* VoidKeyword */:
+                case 138 /* SymbolKeyword */:
+                case 164 /* ConstructorType */:
+                case 163 /* FunctionType */:
+                case 165 /* TypeQuery */:
+                case 162 /* TypeReference */:
+                case 169 /* UnionType */:
+                case 170 /* IntersectionType */:
+                case 171 /* ConditionalType */:
+                case 173 /* ParenthesizedType */:
+                case 174 /* ThisType */:
+                case 175 /* TypeOperator */:
+                case 176 /* IndexedAccessType */:
+                case 177 /* MappedType */:
+                case 178 /* LiteralType */:
+                // TypeScript type nodes are elided.
+                case 160 /* IndexSignature */:
+                // TypeScript index signatures are elided.
+                case 150 /* Decorator */:
+                // TypeScript decorators are elided. They will be emitted as part of visitClassDeclaration.
+                case 237 /* TypeAliasDeclaration */:
+                    // TypeScript type-only declarations are elided.
                     return undefined;
-                case 152:
+                case 152 /* PropertyDeclaration */:
+                    // TypeScript property declarations are elided. However their names are still visited, and can potentially be retained if they could have sideeffects
                     return visitPropertyDeclaration(node);
-                case 242:
+                case 242 /* NamespaceExportDeclaration */:
+                    // TypeScript namespace export declarations are elided.
                     return undefined;
-                case 155:
+                case 155 /* Constructor */:
                     return visitConstructor(node);
-                case 236:
+                case 236 /* InterfaceDeclaration */:
+                    // TypeScript interfaces are elided, but some comments may be preserved.
+                    // See the implementation of `getLeadingComments` in comments.ts for more details.
                     return ts.createNotEmittedStatement(node);
-                case 235:
+                case 235 /* ClassDeclaration */:
+                    // This is a class declaration with TypeScript syntax extensions.
+                    //
+                    // TypeScript class syntax extensions include:
+                    // - decorators
+                    // - optional `implements` heritage clause
+                    // - parameter property assignments in the constructor
+                    // - property declarations
+                    // - index signatures
+                    // - method overload signatures
                     return visitClassDeclaration(node);
-                case 205:
+                case 205 /* ClassExpression */:
+                    // This is a class expression with TypeScript syntax extensions.
+                    //
+                    // TypeScript class syntax extensions include:
+                    // - decorators
+                    // - optional `implements` heritage clause
+                    // - parameter property assignments in the constructor
+                    // - property declarations
+                    // - index signatures
+                    // - method overload signatures
                     return visitClassExpression(node);
-                case 268:
+                case 268 /* HeritageClause */:
+                    // This is a heritage clause with TypeScript syntax extensions.
+                    //
+                    // TypeScript heritage clause extensions include:
+                    // - `implements` clause
                     return visitHeritageClause(node);
-                case 207:
+                case 207 /* ExpressionWithTypeArguments */:
+                    // TypeScript supports type arguments on an expression in an `extends` heritage clause.
                     return visitExpressionWithTypeArguments(node);
-                case 154:
+                case 154 /* MethodDeclaration */:
+                    // TypeScript method declarations may have decorators, modifiers
+                    // or type annotations.
                     return visitMethodDeclaration(node);
-                case 156:
+                case 156 /* GetAccessor */:
+                    // Get Accessors can have TypeScript modifiers, decorators, and type annotations.
                     return visitGetAccessor(node);
-                case 157:
+                case 157 /* SetAccessor */:
+                    // Set Accessors can have TypeScript modifiers and type annotations.
                     return visitSetAccessor(node);
-                case 234:
+                case 234 /* FunctionDeclaration */:
+                    // Typescript function declarations can have modifiers, decorators, and type annotations.
                     return visitFunctionDeclaration(node);
-                case 192:
+                case 192 /* FunctionExpression */:
+                    // TypeScript function expressions can have modifiers and type annotations.
                     return visitFunctionExpression(node);
-                case 193:
+                case 193 /* ArrowFunction */:
+                    // TypeScript arrow functions can have modifiers and type annotations.
                     return visitArrowFunction(node);
-                case 149:
+                case 149 /* Parameter */:
+                    // This is a parameter declaration with TypeScript syntax extensions.
+                    //
+                    // TypeScript parameter declaration syntax extensions include:
+                    // - decorators
+                    // - accessibility modifiers
+                    // - the question mark (?) token for optional parameters
+                    // - type annotations
+                    // - this parameters
                     return visitParameter(node);
-                case 191:
+                case 191 /* ParenthesizedExpression */:
+                    // ParenthesizedExpressions are TypeScript if their expression is a
+                    // TypeAssertion or AsExpression
                     return visitParenthesizedExpression(node);
-                case 190:
-                case 208:
+                case 190 /* TypeAssertionExpression */:
+                case 208 /* AsExpression */:
+                    // TypeScript type assertions are removed, but their subtrees are preserved.
                     return visitAssertionExpression(node);
-                case 187:
+                case 187 /* CallExpression */:
                     return visitCallExpression(node);
-                case 188:
+                case 188 /* NewExpression */:
                     return visitNewExpression(node);
-                case 189:
+                case 189 /* TaggedTemplateExpression */:
                     return visitTaggedTemplateExpression(node);
-                case 209:
+                case 209 /* NonNullExpression */:
+                    // TypeScript non-null expressions are removed, but their subtrees are preserved.
                     return visitNonNullExpression(node);
-                case 238:
+                case 238 /* EnumDeclaration */:
+                    // TypeScript enum declarations do not exist in ES6 and must be rewritten.
                     return visitEnumDeclaration(node);
-                case 214:
+                case 214 /* VariableStatement */:
+                    // TypeScript namespace exports for variable statements must be transformed.
                     return visitVariableStatement(node);
-                case 232:
+                case 232 /* VariableDeclaration */:
                     return visitVariableDeclaration(node);
-                case 239:
+                case 239 /* ModuleDeclaration */:
+                    // TypeScript namespace declarations must be transformed.
                     return visitModuleDeclaration(node);
-                case 243:
+                case 243 /* ImportEqualsDeclaration */:
+                    // TypeScript namespace or external module import.
                     return visitImportEqualsDeclaration(node);
                 default:
                     return ts.Debug.failBadSyntaxKind(node);
@@ -50736,8 +61534,11 @@ var ts;
             var alwaysStrict = ts.getStrictOptionValue(compilerOptions, "alwaysStrict") &&
                 !(ts.isExternalModule(node) && moduleKind >= ts.ModuleKind.ES2015) &&
                 !ts.isJsonSourceFile(node);
-            return ts.updateSourceFileNode(node, ts.visitLexicalEnvironment(node.statements, sourceElementVisitor, context, 0, alwaysStrict));
+            return ts.updateSourceFileNode(node, ts.visitLexicalEnvironment(node.statements, sourceElementVisitor, context, /*start*/ 0, alwaysStrict));
         }
+        /**
+         * Tests whether we should emit a __decorate call for a class declaration.
+         */
         function shouldEmitDecorateCallForClass(node) {
             if (node.decorators && node.decorators.length > 0) {
                 return true;
@@ -50748,68 +61549,104 @@ var ts;
             }
             return false;
         }
+        /**
+         * Tests whether we should emit a __decorate call for a parameter declaration.
+         */
         function shouldEmitDecorateCallForParameter(parameter) {
             return parameter.decorators !== undefined && parameter.decorators.length > 0;
         }
         function getClassFacts(node, staticProperties) {
-            var facts = 0;
+            var facts = 0 /* None */;
             if (ts.some(staticProperties))
-                facts |= 1;
+                facts |= 1 /* HasStaticInitializedProperties */;
             var extendsClauseElement = ts.getClassExtendsHeritageClauseElement(node);
-            if (extendsClauseElement && ts.skipOuterExpressions(extendsClauseElement.expression).kind !== 95)
-                facts |= 64;
+            if (extendsClauseElement && ts.skipOuterExpressions(extendsClauseElement.expression).kind !== 95 /* NullKeyword */)
+                facts |= 64 /* IsDerivedClass */;
             if (shouldEmitDecorateCallForClass(node))
-                facts |= 2;
+                facts |= 2 /* HasConstructorDecorators */;
             if (ts.childIsDecorated(node))
-                facts |= 4;
+                facts |= 4 /* HasMemberDecorators */;
             if (isExportOfNamespace(node))
-                facts |= 8;
+                facts |= 8 /* IsExportOfNamespace */;
             else if (isDefaultExternalModuleExport(node))
-                facts |= 32;
+                facts |= 32 /* IsDefaultExternalExport */;
             else if (isNamedExternalModuleExport(node))
-                facts |= 16;
-            if (languageVersion <= 1 && (facts & 7))
-                facts |= 128;
+                facts |= 16 /* IsNamedExternalExport */;
+            if (languageVersion <= 1 /* ES5 */ && (facts & 7 /* MayNeedImmediatelyInvokedFunctionExpression */))
+                facts |= 128 /* UseImmediatelyInvokedFunctionExpression */;
             return facts;
         }
+        /**
+         * Transforms a class declaration with TypeScript syntax into compatible ES6.
+         *
+         * This function will only be called when one of the following conditions are met:
+         * - The class has decorators.
+         * - The class has property declarations with initializers.
+         * - The class contains a constructor that contains parameters with accessibility modifiers.
+         * - The class is an export in a TypeScript namespace.
+         *
+         * @param node The node to transform.
+         */
         function visitClassDeclaration(node) {
             var savedPendingExpressions = pendingExpressions;
             pendingExpressions = undefined;
-            var staticProperties = getInitializedProperties(node, true);
+            var staticProperties = getInitializedProperties(node, /*isStatic*/ true);
             var facts = getClassFacts(node, staticProperties);
-            if (facts & 128) {
+            if (facts & 128 /* UseImmediatelyInvokedFunctionExpression */) {
                 context.startLexicalEnvironment();
             }
-            var name = node.name || (facts & 5 ? ts.getGeneratedNameForNode(node) : undefined);
-            var classStatement = facts & 2
+            var name = node.name || (facts & 5 /* NeedsName */ ? ts.getGeneratedNameForNode(node) : undefined);
+            var classStatement = facts & 2 /* HasConstructorDecorators */
                 ? createClassDeclarationHeadWithDecorators(node, name, facts)
                 : createClassDeclarationHeadWithoutDecorators(node, name, facts);
             var statements = [classStatement];
+            // Write any pending expressions from elided or moved computed property names
             if (ts.some(pendingExpressions)) {
                 statements.push(ts.createStatement(ts.inlineExpressions(pendingExpressions)));
             }
             pendingExpressions = savedPendingExpressions;
-            if (facts & 1) {
-                addInitializedPropertyStatements(statements, staticProperties, facts & 128 ? ts.getInternalName(node) : ts.getLocalName(node));
+            // Emit static property assignment. Because classDeclaration is lexically evaluated,
+            // it is safe to emit static property assignment after classDeclaration
+            // From ES6 specification:
+            //      HasLexicalDeclaration (N) : Determines if the argument identifier has a binding in this environment record that was created using
+            //                                  a lexical declaration such as a LexicalDeclaration or a ClassDeclaration.
+            if (facts & 1 /* HasStaticInitializedProperties */) {
+                addInitializedPropertyStatements(statements, staticProperties, facts & 128 /* UseImmediatelyInvokedFunctionExpression */ ? ts.getInternalName(node) : ts.getLocalName(node));
             }
-            addClassElementDecorationStatements(statements, node, false);
-            addClassElementDecorationStatements(statements, node, true);
+            // Write any decorators of the node.
+            addClassElementDecorationStatements(statements, node, /*isStatic*/ false);
+            addClassElementDecorationStatements(statements, node, /*isStatic*/ true);
             addConstructorDecorationStatement(statements, node);
-            if (facts & 128) {
-                var closingBraceLocation = ts.createTokenRange(ts.skipTrivia(currentSourceFile.text, node.members.end), 18);
+            if (facts & 128 /* UseImmediatelyInvokedFunctionExpression */) {
+                // When we emit a TypeScript class down to ES5, we must wrap it in an IIFE so that the
+                // 'es2015' transformer can properly nest static initializers and decorators. The result
+                // looks something like:
+                //
+                //  var C = function () {
+                //      class C {
+                //      }
+                //      C.static_prop = 1;
+                //      return C;
+                //  }();
+                //
+                var closingBraceLocation = ts.createTokenRange(ts.skipTrivia(currentSourceFile.text, node.members.end), 18 /* CloseBraceToken */);
                 var localName = ts.getInternalName(node);
+                // The following partially-emitted expression exists purely to align our sourcemap
+                // emit with the original emitter.
                 var outer = ts.createPartiallyEmittedExpression(localName);
                 outer.end = closingBraceLocation.end;
-                ts.setEmitFlags(outer, 1536);
+                ts.setEmitFlags(outer, 1536 /* NoComments */);
                 var statement = ts.createReturn(outer);
                 statement.pos = closingBraceLocation.pos;
-                ts.setEmitFlags(statement, 1536 | 384);
+                ts.setEmitFlags(statement, 1536 /* NoComments */ | 384 /* NoTokenSourceMaps */);
                 statements.push(statement);
                 ts.prependStatements(statements, context.endLexicalEnvironment());
                 var iife = ts.createImmediatelyInvokedArrowFunction(statements);
-                ts.setEmitFlags(iife, 33554432);
-                var varStatement = ts.createVariableStatement(undefined, ts.createVariableDeclarationList([
-                    ts.createVariableDeclaration(ts.getLocalName(node, false, false), undefined, iife)
+                ts.setEmitFlags(iife, 33554432 /* TypeScriptClassWrapper */);
+                var varStatement = ts.createVariableStatement(
+                /*modifiers*/ undefined, ts.createVariableDeclarationList([
+                    ts.createVariableDeclaration(ts.getLocalName(node, /*allowComments*/ false, /*allowSourceMaps*/ false), 
+                    /*type*/ undefined, iife)
                 ]));
                 ts.setOriginalNode(varStatement, node);
                 ts.setCommentRange(varStatement, node);
@@ -50817,75 +61654,205 @@ var ts;
                 ts.startOnNewLine(varStatement);
                 statements = [varStatement];
             }
-            if (facts & 8) {
+            // If the class is exported as part of a TypeScript namespace, emit the namespace export.
+            // Otherwise, if the class was exported at the top level and was decorated, emit an export
+            // declaration or export default for the class.
+            if (facts & 8 /* IsExportOfNamespace */) {
                 addExportMemberAssignment(statements, node);
             }
-            else if (facts & 128 || facts & 2) {
-                if (facts & 32) {
-                    statements.push(ts.createExportDefault(ts.getLocalName(node, false, true)));
+            else if (facts & 128 /* UseImmediatelyInvokedFunctionExpression */ || facts & 2 /* HasConstructorDecorators */) {
+                if (facts & 32 /* IsDefaultExternalExport */) {
+                    statements.push(ts.createExportDefault(ts.getLocalName(node, /*allowComments*/ false, /*allowSourceMaps*/ true)));
                 }
-                else if (facts & 16) {
-                    statements.push(ts.createExternalModuleExport(ts.getLocalName(node, false, true)));
+                else if (facts & 16 /* IsNamedExternalExport */) {
+                    statements.push(ts.createExternalModuleExport(ts.getLocalName(node, /*allowComments*/ false, /*allowSourceMaps*/ true)));
                 }
             }
             if (statements.length > 1) {
+                // Add a DeclarationMarker as a marker for the end of the declaration
                 statements.push(ts.createEndOfDeclarationMarker(node));
-                ts.setEmitFlags(classStatement, ts.getEmitFlags(classStatement) | 4194304);
+                ts.setEmitFlags(classStatement, ts.getEmitFlags(classStatement) | 4194304 /* HasEndOfDeclarationMarker */);
             }
             return ts.singleOrMany(statements);
         }
+        /**
+         * Transforms a non-decorated class declaration and appends the resulting statements.
+         *
+         * @param node A ClassDeclaration node.
+         * @param name The name of the class.
+         * @param facts Precomputed facts about the class.
+         */
         function createClassDeclarationHeadWithoutDecorators(node, name, facts) {
-            var modifiers = !(facts & 128)
+            //  ${modifiers} class ${name} ${heritageClauses} {
+            //      ${members}
+            //  }
+            // we do not emit modifiers on the declaration if we are emitting an IIFE
+            var modifiers = !(facts & 128 /* UseImmediatelyInvokedFunctionExpression */)
                 ? ts.visitNodes(node.modifiers, modifierVisitor, ts.isModifier)
                 : undefined;
-            var classDeclaration = ts.createClassDeclaration(undefined, modifiers, name, undefined, ts.visitNodes(node.heritageClauses, visitor, ts.isHeritageClause), transformClassMembers(node, (facts & 64) !== 0));
+            var classDeclaration = ts.createClassDeclaration(
+            /*decorators*/ undefined, modifiers, name, 
+            /*typeParameters*/ undefined, ts.visitNodes(node.heritageClauses, visitor, ts.isHeritageClause), transformClassMembers(node, (facts & 64 /* IsDerivedClass */) !== 0));
+            // To better align with the old emitter, we should not emit a trailing source map
+            // entry if the class has static properties.
             var emitFlags = ts.getEmitFlags(node);
-            if (facts & 1) {
-                emitFlags |= 32;
+            if (facts & 1 /* HasStaticInitializedProperties */) {
+                emitFlags |= 32 /* NoTrailingSourceMap */;
             }
             ts.setTextRange(classDeclaration, node);
             ts.setOriginalNode(classDeclaration, node);
             ts.setEmitFlags(classDeclaration, emitFlags);
             return classDeclaration;
         }
+        /**
+         * Transforms a decorated class declaration and appends the resulting statements. If
+         * the class requires an alias to avoid issues with double-binding, the alias is returned.
+         */
         function createClassDeclarationHeadWithDecorators(node, name, facts) {
+            // When we emit an ES6 class that has a class decorator, we must tailor the
+            // emit to certain specific cases.
+            //
+            // In the simplest case, we emit the class declaration as a let declaration, and
+            // evaluate decorators after the close of the class body:
+            //
+            //  [Example 1]
+            //  ---------------------------------------------------------------------
+            //  TypeScript                      | Javascript
+            //  ---------------------------------------------------------------------
+            //  @dec                            | let C = class C {
+            //  class C {                       | }
+            //  }                               | C = __decorate([dec], C);
+            //  ---------------------------------------------------------------------
+            //  @dec                            | let C = class C {
+            //  export class C {                | }
+            //  }                               | C = __decorate([dec], C);
+            //                                  | export { C };
+            //  ---------------------------------------------------------------------
+            //
+            // If a class declaration contains a reference to itself *inside* of the class body,
+            // this introduces two bindings to the class: One outside of the class body, and one
+            // inside of the class body. If we apply decorators as in [Example 1] above, there
+            // is the possibility that the decorator `dec` will return a new value for the
+            // constructor, which would result in the binding inside of the class no longer
+            // pointing to the same reference as the binding outside of the class.
+            //
+            // As a result, we must instead rewrite all references to the class *inside* of the
+            // class body to instead point to a local temporary alias for the class:
+            //
+            //  [Example 2]
+            //  ---------------------------------------------------------------------
+            //  TypeScript                      | Javascript
+            //  ---------------------------------------------------------------------
+            //  @dec                            | let C = C_1 = class C {
+            //  class C {                       |   static x() { return C_1.y; }
+            //    static x() { return C.y; }    | }
+            //    static y = 1;                 | C.y = 1;
+            //  }                               | C = C_1 = __decorate([dec], C);
+            //                                  | var C_1;
+            //  ---------------------------------------------------------------------
+            //  @dec                            | let C = class C {
+            //  export class C {                |   static x() { return C_1.y; }
+            //    static x() { return C.y; }    | }
+            //    static y = 1;                 | C.y = 1;
+            //  }                               | C = C_1 = __decorate([dec], C);
+            //                                  | export { C };
+            //                                  | var C_1;
+            //  ---------------------------------------------------------------------
+            //
+            // If a class declaration is the default export of a module, we instead emit
+            // the export after the decorated declaration:
+            //
+            //  [Example 3]
+            //  ---------------------------------------------------------------------
+            //  TypeScript                      | Javascript
+            //  ---------------------------------------------------------------------
+            //  @dec                            | let default_1 = class {
+            //  export default class {          | }
+            //  }                               | default_1 = __decorate([dec], default_1);
+            //                                  | export default default_1;
+            //  ---------------------------------------------------------------------
+            //  @dec                            | let C = class C {
+            //  export default class C {        | }
+            //  }                               | C = __decorate([dec], C);
+            //                                  | export default C;
+            //  ---------------------------------------------------------------------
+            //
+            // If the class declaration is the default export and a reference to itself
+            // inside of the class body, we must emit both an alias for the class *and*
+            // move the export after the declaration:
+            //
+            //  [Example 4]
+            //  ---------------------------------------------------------------------
+            //  TypeScript                      | Javascript
+            //  ---------------------------------------------------------------------
+            //  @dec                            | let C = class C {
+            //  export default class C {        |   static x() { return C_1.y; }
+            //    static x() { return C.y; }    | }
+            //    static y = 1;                 | C.y = 1;
+            //  }                               | C = C_1 = __decorate([dec], C);
+            //                                  | export default C;
+            //                                  | var C_1;
+            //  ---------------------------------------------------------------------
+            //
             var location = ts.moveRangePastDecorators(node);
             var classAlias = getClassAliasIfNeeded(node);
-            var declName = ts.getLocalName(node, false, true);
+            var declName = ts.getLocalName(node, /*allowComments*/ false, /*allowSourceMaps*/ true);
+            //  ... = class ${name} ${heritageClauses} {
+            //      ${members}
+            //  }
             var heritageClauses = ts.visitNodes(node.heritageClauses, visitor, ts.isHeritageClause);
-            var members = transformClassMembers(node, (facts & 64) !== 0);
-            var classExpression = ts.createClassExpression(undefined, name, undefined, heritageClauses, members);
+            var members = transformClassMembers(node, (facts & 64 /* IsDerivedClass */) !== 0);
+            var classExpression = ts.createClassExpression(/*modifiers*/ undefined, name, /*typeParameters*/ undefined, heritageClauses, members);
             ts.setOriginalNode(classExpression, node);
             ts.setTextRange(classExpression, location);
-            var statement = ts.createVariableStatement(undefined, ts.createVariableDeclarationList([
-                ts.createVariableDeclaration(declName, undefined, classAlias ? ts.createAssignment(classAlias, classExpression) : classExpression)
-            ], 1));
+            //  let ${name} = ${classExpression} where name is either declaredName if the class doesn't contain self-reference
+            //                                         or decoratedClassAlias if the class contain self-reference.
+            var statement = ts.createVariableStatement(
+            /*modifiers*/ undefined, ts.createVariableDeclarationList([
+                ts.createVariableDeclaration(declName, 
+                /*type*/ undefined, classAlias ? ts.createAssignment(classAlias, classExpression) : classExpression)
+            ], 1 /* Let */));
             ts.setOriginalNode(statement, node);
             ts.setTextRange(statement, location);
             ts.setCommentRange(statement, node);
             return statement;
         }
+        /**
+         * Transforms a class expression with TypeScript syntax into compatible ES6.
+         *
+         * This function will only be called when one of the following conditions are met:
+         * - The class has property declarations with initializers.
+         * - The class contains a constructor that contains parameters with accessibility modifiers.
+         *
+         * @param node The node to transform.
+         */
         function visitClassExpression(node) {
             var savedPendingExpressions = pendingExpressions;
             pendingExpressions = undefined;
-            var staticProperties = getInitializedProperties(node, true);
+            var staticProperties = getInitializedProperties(node, /*isStatic*/ true);
             var heritageClauses = ts.visitNodes(node.heritageClauses, visitor, ts.isHeritageClause);
-            var members = transformClassMembers(node, ts.some(heritageClauses, function (c) { return c.token === 85; }));
-            var classExpression = ts.createClassExpression(undefined, node.name, undefined, heritageClauses, members);
+            var members = transformClassMembers(node, ts.some(heritageClauses, function (c) { return c.token === 85 /* ExtendsKeyword */; }));
+            var classExpression = ts.createClassExpression(
+            /*modifiers*/ undefined, node.name, 
+            /*typeParameters*/ undefined, heritageClauses, members);
             ts.setOriginalNode(classExpression, node);
             ts.setTextRange(classExpression, node);
             if (ts.some(staticProperties) || ts.some(pendingExpressions)) {
                 var expressions = [];
-                var isClassWithConstructorReference = resolver.getNodeCheckFlags(node) & 8388608;
+                var isClassWithConstructorReference = resolver.getNodeCheckFlags(node) & 8388608 /* ClassWithConstructorReference */;
                 var temp = ts.createTempVariable(hoistVariableDeclaration, !!isClassWithConstructorReference);
                 if (isClassWithConstructorReference) {
+                    // record an alias as the class name is not in scope for statics.
                     enableSubstitutionForClassAliases();
                     var alias = ts.getSynthesizedClone(temp);
-                    alias.autoGenerateFlags &= ~8;
+                    alias.autoGenerateFlags &= ~8 /* ReservedInNestedScopes */;
                     classAliases[ts.getOriginalNodeId(node)] = alias;
                 }
-                ts.setEmitFlags(classExpression, 65536 | ts.getEmitFlags(classExpression));
+                // To preserve the behavior of the old emitter, we explicitly indent
+                // the body of a class with static initializers.
+                ts.setEmitFlags(classExpression, 65536 /* Indented */ | ts.getEmitFlags(classExpression));
                 expressions.push(ts.startOnNewLine(ts.createAssignment(temp, classExpression)));
+                // Add any pending expressions leftover from elided or relocated computed property names
                 ts.addRange(expressions, ts.map(pendingExpressions, ts.startOnNewLine));
                 pendingExpressions = savedPendingExpressions;
                 ts.addRange(expressions, generateInitializedPropertyExpressions(staticProperties, temp));
@@ -50895,6 +61862,12 @@ var ts;
             pendingExpressions = savedPendingExpressions;
             return classExpression;
         }
+        /**
+         * Transforms the members of a class.
+         *
+         * @param node The current class.
+         * @param isDerivedClass A value indicating whether the class has an extends clause that does not extend 'null'.
+         */
         function transformClassMembers(node, isDerivedClass) {
             var members = [];
             var constructor = transformConstructor(node, isDerivedClass);
@@ -50902,52 +61875,137 @@ var ts;
                 members.push(constructor);
             }
             ts.addRange(members, ts.visitNodes(node.members, classElementVisitor, ts.isClassElement));
-            return ts.setTextRange(ts.createNodeArray(members), node.members);
+            return ts.setTextRange(ts.createNodeArray(members), /*location*/ node.members);
         }
+        /**
+         * Transforms (or creates) a constructor for a class.
+         *
+         * @param node The current class.
+         * @param isDerivedClass A value indicating whether the class has an extends clause that does not extend 'null'.
+         */
         function transformConstructor(node, isDerivedClass) {
+            // Check if we have property assignment inside class declaration.
+            // If there is a property assignment, we need to emit constructor whether users define it or not
+            // If there is no property assignment, we can omit constructor if users do not define it
             var hasInstancePropertyWithInitializer = ts.forEach(node.members, isInstanceInitializedProperty);
-            var hasParameterPropertyAssignments = node.transformFlags & 262144;
+            var hasParameterPropertyAssignments = node.transformFlags & 262144 /* ContainsParameterPropertyAssignments */;
             var constructor = ts.getFirstConstructorWithBody(node);
+            // If the class does not contain nodes that require a synthesized constructor,
+            // accept the current constructor if it exists.
             if (!hasInstancePropertyWithInitializer && !hasParameterPropertyAssignments) {
                 return ts.visitEachChild(constructor, visitor, context);
             }
             var parameters = transformConstructorParameters(constructor);
             var body = transformConstructorBody(node, constructor, isDerivedClass);
-            return ts.startOnNewLine(ts.setOriginalNode(ts.setTextRange(ts.createConstructor(undefined, undefined, parameters, body), constructor || node), constructor));
+            //  constructor(${parameters}) {
+            //      ${body}
+            //  }
+            return ts.startOnNewLine(ts.setOriginalNode(ts.setTextRange(ts.createConstructor(
+            /*decorators*/ undefined, 
+            /*modifiers*/ undefined, parameters, body), constructor || node), constructor));
         }
+        /**
+         * Transforms (or creates) the parameters for the constructor of a class with
+         * parameter property assignments or instance property initializers.
+         *
+         * @param constructor The constructor declaration.
+         */
         function transformConstructorParameters(constructor) {
+            // The ES2015 spec specifies in 14.5.14. Runtime Semantics: ClassDefinitionEvaluation:
+            // If constructor is empty, then
+            //     If ClassHeritag_eopt is present and protoParent is not null, then
+            //          Let constructor be the result of parsing the source text
+            //              constructor(...args) { super (...args);}
+            //          using the syntactic grammar with the goal symbol MethodDefinition[~Yield].
+            //      Else,
+            //           Let constructor be the result of parsing the source text
+            //               constructor( ){ }
+            //           using the syntactic grammar with the goal symbol MethodDefinition[~Yield].
+            //
+            // While we could emit the '...args' rest parameter, certain later tools in the pipeline might
+            // downlevel the '...args' portion less efficiently by naively copying the contents of 'arguments' to an array.
+            // Instead, we'll avoid using a rest parameter and spread into the super call as
+            // 'super(...arguments)' instead of 'super(...args)', as you can see in "transformConstructorBody".
             return ts.visitParameterList(constructor && constructor.parameters, visitor, context)
                 || [];
         }
+        /**
+         * Transforms (or creates) a constructor body for a class with parameter property
+         * assignments or instance property initializers.
+         *
+         * @param node The current class.
+         * @param constructor The current class constructor.
+         * @param isDerivedClass A value indicating whether the class has an extends clause that does not extend 'null'.
+         */
         function transformConstructorBody(node, constructor, isDerivedClass) {
             var statements = [];
             var indexOfFirstStatement = 0;
             resumeLexicalEnvironment();
             if (constructor) {
                 indexOfFirstStatement = addPrologueDirectivesAndInitialSuperCall(constructor, statements);
+                // Add parameters with property assignments. Transforms this:
+                //
+                //  constructor (public x, public y) {
+                //  }
+                //
+                // Into this:
+                //
+                //  constructor (x, y) {
+                //      this.x = x;
+                //      this.y = y;
+                //  }
+                //
                 var propertyAssignments = getParametersWithPropertyAssignments(constructor);
                 ts.addRange(statements, ts.map(propertyAssignments, transformParameterWithPropertyAssignment));
             }
             else if (isDerivedClass) {
-                statements.push(ts.createStatement(ts.createCall(ts.createSuper(), undefined, [ts.createSpread(ts.createIdentifier("arguments"))])));
+                // Add a synthetic `super` call:
+                //
+                //  super(...arguments);
+                //
+                statements.push(ts.createStatement(ts.createCall(ts.createSuper(), 
+                /*typeArguments*/ undefined, [ts.createSpread(ts.createIdentifier("arguments"))])));
             }
-            var properties = getInitializedProperties(node, false);
+            // Add the property initializers. Transforms this:
+            //
+            //  public x = 1;
+            //
+            // Into this:
+            //
+            //  constructor() {
+            //      this.x = 1;
+            //  }
+            //
+            var properties = getInitializedProperties(node, /*isStatic*/ false);
             addInitializedPropertyStatements(statements, properties, ts.createThis());
             if (constructor) {
+                // The class already had a constructor, so we should add the existing statements, skipping the initial super call.
                 ts.addRange(statements, ts.visitNodes(constructor.body.statements, visitor, ts.isStatement, indexOfFirstStatement));
             }
+            // End the lexical environment.
             statements = ts.mergeLexicalEnvironment(statements, endLexicalEnvironment());
-            return ts.setTextRange(ts.createBlock(ts.setTextRange(ts.createNodeArray(statements), constructor ? constructor.body.statements : node.members), true), constructor ? constructor.body : undefined);
+            return ts.setTextRange(ts.createBlock(ts.setTextRange(ts.createNodeArray(statements), 
+            /*location*/ constructor ? constructor.body.statements : node.members), 
+            /*multiLine*/ true), 
+            /*location*/ constructor ? constructor.body : undefined);
         }
+        /**
+         * Adds super call and preceding prologue directives into the list of statements.
+         *
+         * @param ctor The constructor node.
+         * @returns index of the statement that follows super call
+         */
         function addPrologueDirectivesAndInitialSuperCall(ctor, result) {
             if (ctor.body) {
                 var statements = ctor.body.statements;
-                var index = ts.addPrologue(result, statements, false, visitor);
+                // add prologue directives to the list (if any)
+                var index = ts.addPrologue(result, statements, /*ensureUseStrict*/ false, visitor);
                 if (index === statements.length) {
+                    // list contains nothing but prologue directives (or empty) - exit
                     return index;
                 }
                 var statement = statements[index];
-                if (statement.kind === 216 && ts.isSuperCall(statement.expression)) {
+                if (statement.kind === 216 /* ExpressionStatement */ && ts.isSuperCall(statement.expression)) {
                     result.push(ts.visitNode(statement, visitor, ts.isStatement));
                     return index + 1;
                 }
@@ -50955,36 +62013,79 @@ var ts;
             }
             return 0;
         }
+        /**
+         * Gets all parameters of a constructor that should be transformed into property assignments.
+         *
+         * @param node The constructor node.
+         */
         function getParametersWithPropertyAssignments(node) {
             return ts.filter(node.parameters, isParameterWithPropertyAssignment);
         }
+        /**
+         * Determines whether a parameter should be transformed into a property assignment.
+         *
+         * @param parameter The parameter node.
+         */
         function isParameterWithPropertyAssignment(parameter) {
-            return ts.hasModifier(parameter, 92)
+            return ts.hasModifier(parameter, 92 /* ParameterPropertyModifier */)
                 && ts.isIdentifier(parameter.name);
         }
+        /**
+         * Transforms a parameter into a property assignment statement.
+         *
+         * @param node The parameter declaration.
+         */
         function transformParameterWithPropertyAssignment(node) {
             ts.Debug.assert(ts.isIdentifier(node.name));
             var name = node.name;
             var propertyName = ts.getMutableClone(name);
-            ts.setEmitFlags(propertyName, 1536 | 48);
+            ts.setEmitFlags(propertyName, 1536 /* NoComments */ | 48 /* NoSourceMap */);
             var localName = ts.getMutableClone(name);
-            ts.setEmitFlags(localName, 1536);
-            return ts.startOnNewLine(ts.setEmitFlags(ts.setTextRange(ts.createStatement(ts.createAssignment(ts.setTextRange(ts.createPropertyAccess(ts.createThis(), propertyName), node.name), localName)), ts.moveRangePos(node, -1)), 1536));
+            ts.setEmitFlags(localName, 1536 /* NoComments */);
+            return ts.startOnNewLine(ts.setEmitFlags(ts.setTextRange(ts.createStatement(ts.createAssignment(ts.setTextRange(ts.createPropertyAccess(ts.createThis(), propertyName), node.name), localName)), ts.moveRangePos(node, -1)), 1536 /* NoComments */));
         }
+        /**
+         * Gets all property declarations with initializers on either the static or instance side of a class.
+         *
+         * @param node The class node.
+         * @param isStatic A value indicating whether to get properties from the static or instance side of the class.
+         */
         function getInitializedProperties(node, isStatic) {
             return ts.filter(node.members, isStatic ? isStaticInitializedProperty : isInstanceInitializedProperty);
         }
+        /**
+         * Gets a value indicating whether a class element is a static property declaration with an initializer.
+         *
+         * @param member The class element node.
+         */
         function isStaticInitializedProperty(member) {
-            return isInitializedProperty(member, true);
+            return isInitializedProperty(member, /*isStatic*/ true);
         }
+        /**
+         * Gets a value indicating whether a class element is an instance property declaration with an initializer.
+         *
+         * @param member The class element node.
+         */
         function isInstanceInitializedProperty(member) {
-            return isInitializedProperty(member, false);
+            return isInitializedProperty(member, /*isStatic*/ false);
         }
+        /**
+         * Gets a value indicating whether a class element is either a static or an instance property declaration with an initializer.
+         *
+         * @param member The class element node.
+         * @param isStatic A value indicating whether the member should be a static or instance member.
+         */
         function isInitializedProperty(member, isStatic) {
-            return member.kind === 152
-                && isStatic === ts.hasModifier(member, 32)
+            return member.kind === 152 /* PropertyDeclaration */
+                && isStatic === ts.hasModifier(member, 32 /* Static */)
                 && member.initializer !== undefined;
         }
+        /**
+         * Generates assignment statements for property initializers.
+         *
+         * @param properties An array of property declarations to transform.
+         * @param receiver The receiver on which each property should be assigned.
+         */
         function addInitializedPropertyStatements(statements, properties, receiver) {
             for (var _i = 0, properties_10 = properties; _i < properties_10.length; _i++) {
                 var property = properties_10[_i];
@@ -50994,6 +62095,12 @@ var ts;
                 statements.push(statement);
             }
         }
+        /**
+         * Generates assignment expressions for property initializers.
+         *
+         * @param properties An array of property declarations to transform.
+         * @param receiver The receiver on which each property should be assigned.
+         */
         function generateInitializedPropertyExpressions(properties, receiver) {
             var expressions = [];
             for (var _i = 0, properties_11 = properties; _i < properties_11.length; _i++) {
@@ -51006,27 +62113,66 @@ var ts;
             }
             return expressions;
         }
+        /**
+         * Transforms a property initializer into an assignment statement.
+         *
+         * @param property The property declaration.
+         * @param receiver The object receiving the property assignment.
+         */
         function transformInitializedProperty(property, receiver) {
+            // We generate a name here in order to reuse the value cached by the relocated computed name expression (which uses the same generated name)
             var propertyName = ts.isComputedPropertyName(property.name) && !isSimpleInlineableExpression(property.name.expression)
                 ? ts.updateComputedPropertyName(property.name, ts.getGeneratedNameForNode(property.name))
                 : property.name;
             var initializer = ts.visitNode(property.initializer, visitor, ts.isExpression);
-            var memberAccess = ts.createMemberAccessForPropertyName(receiver, propertyName, propertyName);
+            var memberAccess = ts.createMemberAccessForPropertyName(receiver, propertyName, /*location*/ propertyName);
             return ts.createAssignment(memberAccess, initializer);
         }
+        /**
+         * Gets either the static or instance members of a class that are decorated, or have
+         * parameters that are decorated.
+         *
+         * @param node The class containing the member.
+         * @param isStatic A value indicating whether to retrieve static or instance members of
+         *                 the class.
+         */
         function getDecoratedClassElements(node, isStatic) {
             return ts.filter(node.members, isStatic ? function (m) { return isStaticDecoratedClassElement(m, node); } : function (m) { return isInstanceDecoratedClassElement(m, node); });
         }
+        /**
+         * Determines whether a class member is a static member of a class that is decorated, or
+         * has parameters that are decorated.
+         *
+         * @param member The class member.
+         */
         function isStaticDecoratedClassElement(member, parent) {
-            return isDecoratedClassElement(member, true, parent);
+            return isDecoratedClassElement(member, /*isStatic*/ true, parent);
         }
+        /**
+         * Determines whether a class member is an instance member of a class that is decorated,
+         * or has parameters that are decorated.
+         *
+         * @param member The class member.
+         */
         function isInstanceDecoratedClassElement(member, parent) {
-            return isDecoratedClassElement(member, false, parent);
+            return isDecoratedClassElement(member, /*isStatic*/ false, parent);
         }
+        /**
+         * Determines whether a class member is either a static or an instance member of a class
+         * that is decorated, or has parameters that are decorated.
+         *
+         * @param member The class member.
+         */
         function isDecoratedClassElement(member, isStatic, parent) {
             return ts.nodeOrChildIsDecorated(member, parent)
-                && isStatic === ts.hasModifier(member, 32);
+                && isStatic === ts.hasModifier(member, 32 /* Static */);
         }
+        /**
+         * Gets an array of arrays of decorators for the parameters of a function-like node.
+         * The offset into the result array should correspond to the offset of the parameter.
+         *
+         * @param node The function-like node.
+         */
         function getDecoratorsOfParameters(node) {
             var decorators;
             if (node) {
@@ -51043,6 +62189,12 @@ var ts;
             }
             return decorators;
         }
+        /**
+         * Gets an AllDecorators object containing the decorators for the class and the decorators for the
+         * parameters of the constructor of the class.
+         *
+         * @param node The class node.
+         */
         function getAllDecoratorsOfConstructor(node) {
             var decorators = node.decorators;
             var parameters = getDecoratorsOfParameters(ts.getFirstConstructorWithBody(node));
@@ -51054,19 +62206,31 @@ var ts;
                 parameters: parameters
             };
         }
+        /**
+         * Gets an AllDecorators object containing the decorators for the member and its parameters.
+         *
+         * @param node The class node that contains the member.
+         * @param member The class member.
+         */
         function getAllDecoratorsOfClassElement(node, member) {
             switch (member.kind) {
-                case 156:
-                case 157:
+                case 156 /* GetAccessor */:
+                case 157 /* SetAccessor */:
                     return getAllDecoratorsOfAccessors(node, member);
-                case 154:
+                case 154 /* MethodDeclaration */:
                     return getAllDecoratorsOfMethod(member);
-                case 152:
+                case 152 /* PropertyDeclaration */:
                     return getAllDecoratorsOfProperty(member);
                 default:
                     return undefined;
             }
         }
+        /**
+         * Gets an AllDecorators object containing the decorators for the accessor and its parameters.
+         *
+         * @param node The class node that contains the accessor.
+         * @param accessor The class accessor member.
+         */
         function getAllDecoratorsOfAccessors(node, accessor) {
             if (!accessor.body) {
                 return undefined;
@@ -51083,6 +62247,11 @@ var ts;
             }
             return { decorators: decorators, parameters: parameters };
         }
+        /**
+         * Gets an AllDecorators object containing the decorators for the method and its parameters.
+         *
+         * @param method The class method member.
+         */
         function getAllDecoratorsOfMethod(method) {
             if (!method.body) {
                 return undefined;
@@ -51094,6 +62263,11 @@ var ts;
             }
             return { decorators: decorators, parameters: parameters };
         }
+        /**
+         * Gets an AllDecorators object containing the decorators for the property.
+         *
+         * @param property The class property member.
+         */
         function getAllDecoratorsOfProperty(property) {
             var decorators = property.decorators;
             if (!decorators) {
@@ -51101,6 +62275,12 @@ var ts;
             }
             return { decorators: decorators };
         }
+        /**
+         * Transforms all of the decorators for a declaration into an array of expressions.
+         *
+         * @param node The declaration node.
+         * @param allDecorators An object containing all of the decorators for the declaration.
+         */
         function transformAllDecoratorsOfDeclaration(node, container, allDecorators) {
             if (!allDecorators) {
                 return undefined;
@@ -51111,14 +62291,30 @@ var ts;
             addTypeMetadata(node, container, decoratorExpressions);
             return decoratorExpressions;
         }
+        /**
+         * Generates statements used to apply decorators to either the static or instance members
+         * of a class.
+         *
+         * @param node The class node.
+         * @param isStatic A value indicating whether to generate statements for static or
+         *                 instance members.
+         */
         function addClassElementDecorationStatements(statements, node, isStatic) {
             ts.addRange(statements, ts.map(generateClassElementDecorationExpressions(node, isStatic), expressionToStatement));
         }
+        /**
+         * Generates expressions used to apply decorators to either the static or instance members
+         * of a class.
+         *
+         * @param node The class node.
+         * @param isStatic A value indicating whether to generate expressions for static or
+         *                 instance members.
+         */
         function generateClassElementDecorationExpressions(node, isStatic) {
             var members = getDecoratedClassElements(node, isStatic);
             var expressions;
-            for (var _i = 0, members_5 = members; _i < members_5.length; _i++) {
-                var member = members_5[_i];
+            for (var _i = 0, members_4 = members; _i < members_4.length; _i++) {
+                var member = members_4[_i];
                 var expression = generateClassElementDecorationExpression(node, member);
                 if (expression) {
                     if (!expressions) {
@@ -51131,29 +62327,79 @@ var ts;
             }
             return expressions;
         }
+        /**
+         * Generates an expression used to evaluate class element decorators at runtime.
+         *
+         * @param node The class node that contains the member.
+         * @param member The class member.
+         */
         function generateClassElementDecorationExpression(node, member) {
             var allDecorators = getAllDecoratorsOfClassElement(node, member);
             var decoratorExpressions = transformAllDecoratorsOfDeclaration(member, node, allDecorators);
             if (!decoratorExpressions) {
                 return undefined;
             }
+            // Emit the call to __decorate. Given the following:
+            //
+            //   class C {
+            //     @dec method(@dec2 x) {}
+            //     @dec get accessor() {}
+            //     @dec prop;
+            //   }
+            //
+            // The emit for a method is:
+            //
+            //   __decorate([
+            //       dec,
+            //       __param(0, dec2),
+            //       __metadata("design:type", Function),
+            //       __metadata("design:paramtypes", [Object]),
+            //       __metadata("design:returntype", void 0)
+            //   ], C.prototype, "method", null);
+            //
+            // The emit for an accessor is:
+            //
+            //   __decorate([
+            //       dec
+            //   ], C.prototype, "accessor", null);
+            //
+            // The emit for a property is:
+            //
+            //   __decorate([
+            //       dec
+            //   ], C.prototype, "prop");
+            //
             var prefix = getClassMemberPrefix(node, member);
-            var memberName = getExpressionForPropertyName(member, true);
-            var descriptor = languageVersion > 0
-                ? member.kind === 152
+            var memberName = getExpressionForPropertyName(member, /*generateNameForComputedPropertyName*/ true);
+            var descriptor = languageVersion > 0 /* ES3 */
+                ? member.kind === 152 /* PropertyDeclaration */
+                    // We emit `void 0` here to indicate to `__decorate` that it can invoke `Object.defineProperty` directly, but that it
+                    // should not invoke `Object.getOwnPropertyDescriptor`.
                     ? ts.createVoidZero()
+                    // We emit `null` here to indicate to `__decorate` that it can invoke `Object.getOwnPropertyDescriptor` directly.
+                    // We have this extra argument here so that we can inject an explicit property descriptor at a later date.
                     : ts.createNull()
                 : undefined;
             var helper = createDecorateHelper(context, decoratorExpressions, prefix, memberName, descriptor, ts.moveRangePastDecorators(member));
-            ts.setEmitFlags(helper, 1536);
+            ts.setEmitFlags(helper, 1536 /* NoComments */);
             return helper;
         }
+        /**
+         * Generates a __decorate helper call for a class constructor.
+         *
+         * @param node The class node.
+         */
         function addConstructorDecorationStatement(statements, node) {
             var expression = generateConstructorDecorationExpression(node);
             if (expression) {
                 statements.push(ts.setOriginalNode(ts.createStatement(expression), node));
             }
         }
+        /**
+         * Generates a __decorate helper call for a class constructor.
+         *
+         * @param node The class node.
+         */
         function generateConstructorDecorationExpression(node) {
             var allDecorators = getAllDecoratorsOfConstructor(node);
             var decoratorExpressions = transformAllDecoratorsOfDeclaration(node, node, allDecorators);
@@ -51161,29 +62407,47 @@ var ts;
                 return undefined;
             }
             var classAlias = classAliases && classAliases[ts.getOriginalNodeId(node)];
-            var localName = ts.getLocalName(node, false, true);
+            var localName = ts.getLocalName(node, /*allowComments*/ false, /*allowSourceMaps*/ true);
             var decorate = createDecorateHelper(context, decoratorExpressions, localName);
             var expression = ts.createAssignment(localName, classAlias ? ts.createAssignment(classAlias, decorate) : decorate);
-            ts.setEmitFlags(expression, 1536);
+            ts.setEmitFlags(expression, 1536 /* NoComments */);
             ts.setSourceMapRange(expression, ts.moveRangePastDecorators(node));
             return expression;
         }
+        /**
+         * Transforms a decorator into an expression.
+         *
+         * @param decorator The decorator node.
+         */
         function transformDecorator(decorator) {
             return ts.visitNode(decorator.expression, visitor, ts.isExpression);
         }
+        /**
+         * Transforms the decorators of a parameter.
+         *
+         * @param decorators The decorators for the parameter at the provided offset.
+         * @param parameterOffset The offset of the parameter.
+         */
         function transformDecoratorsOfParameter(decorators, parameterOffset) {
             var expressions;
             if (decorators) {
                 expressions = [];
                 for (var _i = 0, decorators_1 = decorators; _i < decorators_1.length; _i++) {
                     var decorator = decorators_1[_i];
-                    var helper = createParamHelper(context, transformDecorator(decorator), parameterOffset, decorator.expression);
-                    ts.setEmitFlags(helper, 1536);
+                    var helper = createParamHelper(context, transformDecorator(decorator), parameterOffset, 
+                    /*location*/ decorator.expression);
+                    ts.setEmitFlags(helper, 1536 /* NoComments */);
                     expressions.push(helper);
                 }
             }
             return expressions;
         }
+        /**
+         * Adds optional type metadata for a declaration.
+         *
+         * @param node The declaration node.
+         * @param decoratorExpressions The destination array to which to add new decorator expressions.
+         */
         function addTypeMetadata(node, container, decoratorExpressions) {
             if (USE_NEW_TYPE_METADATA_FORMAT) {
                 addNewTypeMetadata(node, container, decoratorExpressions);
@@ -51209,57 +62473,88 @@ var ts;
             if (compilerOptions.emitDecoratorMetadata) {
                 var properties = void 0;
                 if (shouldAddTypeMetadata(node)) {
-                    (properties || (properties = [])).push(ts.createPropertyAssignment("type", ts.createArrowFunction(undefined, undefined, [], undefined, ts.createToken(36), serializeTypeOfNode(node))));
+                    (properties || (properties = [])).push(ts.createPropertyAssignment("type", ts.createArrowFunction(/*modifiers*/ undefined, /*typeParameters*/ undefined, [], /*type*/ undefined, ts.createToken(36 /* EqualsGreaterThanToken */), serializeTypeOfNode(node))));
                 }
                 if (shouldAddParamTypesMetadata(node)) {
-                    (properties || (properties = [])).push(ts.createPropertyAssignment("paramTypes", ts.createArrowFunction(undefined, undefined, [], undefined, ts.createToken(36), serializeParameterTypesOfNode(node, container))));
+                    (properties || (properties = [])).push(ts.createPropertyAssignment("paramTypes", ts.createArrowFunction(/*modifiers*/ undefined, /*typeParameters*/ undefined, [], /*type*/ undefined, ts.createToken(36 /* EqualsGreaterThanToken */), serializeParameterTypesOfNode(node, container))));
                 }
                 if (shouldAddReturnTypeMetadata(node)) {
-                    (properties || (properties = [])).push(ts.createPropertyAssignment("returnType", ts.createArrowFunction(undefined, undefined, [], undefined, ts.createToken(36), serializeReturnTypeOfNode(node))));
+                    (properties || (properties = [])).push(ts.createPropertyAssignment("returnType", ts.createArrowFunction(/*modifiers*/ undefined, /*typeParameters*/ undefined, [], /*type*/ undefined, ts.createToken(36 /* EqualsGreaterThanToken */), serializeReturnTypeOfNode(node))));
                 }
                 if (properties) {
-                    decoratorExpressions.push(createMetadataHelper(context, "design:typeinfo", ts.createObjectLiteral(properties, true)));
+                    decoratorExpressions.push(createMetadataHelper(context, "design:typeinfo", ts.createObjectLiteral(properties, /*multiLine*/ true)));
                 }
             }
         }
+        /**
+         * Determines whether to emit the "design:type" metadata based on the node's kind.
+         * The caller should have already tested whether the node has decorators and whether the
+         * emitDecoratorMetadata compiler option is set.
+         *
+         * @param node The node to test.
+         */
         function shouldAddTypeMetadata(node) {
             var kind = node.kind;
-            return kind === 154
-                || kind === 156
-                || kind === 157
-                || kind === 152;
+            return kind === 154 /* MethodDeclaration */
+                || kind === 156 /* GetAccessor */
+                || kind === 157 /* SetAccessor */
+                || kind === 152 /* PropertyDeclaration */;
         }
+        /**
+         * Determines whether to emit the "design:returntype" metadata based on the node's kind.
+         * The caller should have already tested whether the node has decorators and whether the
+         * emitDecoratorMetadata compiler option is set.
+         *
+         * @param node The node to test.
+         */
         function shouldAddReturnTypeMetadata(node) {
-            return node.kind === 154;
+            return node.kind === 154 /* MethodDeclaration */;
         }
+        /**
+         * Determines whether to emit the "design:paramtypes" metadata based on the node's kind.
+         * The caller should have already tested whether the node has decorators and whether the
+         * emitDecoratorMetadata compiler option is set.
+         *
+         * @param node The node to test.
+         */
         function shouldAddParamTypesMetadata(node) {
             switch (node.kind) {
-                case 235:
-                case 205:
+                case 235 /* ClassDeclaration */:
+                case 205 /* ClassExpression */:
                     return ts.getFirstConstructorWithBody(node) !== undefined;
-                case 154:
-                case 156:
-                case 157:
+                case 154 /* MethodDeclaration */:
+                case 156 /* GetAccessor */:
+                case 157 /* SetAccessor */:
                     return true;
             }
             return false;
         }
+        /**
+         * Serializes the type of a node for use with decorator type metadata.
+         *
+         * @param node The node that should have its type serialized.
+         */
         function serializeTypeOfNode(node) {
             switch (node.kind) {
-                case 152:
-                case 149:
-                case 156:
+                case 152 /* PropertyDeclaration */:
+                case 149 /* Parameter */:
+                case 156 /* GetAccessor */:
                     return serializeTypeNode(node.type);
-                case 157:
+                case 157 /* SetAccessor */:
                     return serializeTypeNode(ts.getSetAccessorTypeAnnotationNode(node));
-                case 235:
-                case 205:
-                case 154:
+                case 235 /* ClassDeclaration */:
+                case 205 /* ClassExpression */:
+                case 154 /* MethodDeclaration */:
                     return ts.createIdentifier("Function");
                 default:
                     return ts.createVoidZero();
             }
         }
+        /**
+         * Serializes the types of the parameters of a node for use with decorator type metadata.
+         *
+         * @param node The node that should have its parameter types serialized.
+         */
         function serializeParameterTypesOfNode(node, container) {
             var valueDeclaration = ts.isClassLike(node)
                 ? ts.getFirstConstructorWithBody(node)
@@ -51286,7 +62581,7 @@ var ts;
             return ts.createArrayLiteral(expressions);
         }
         function getParametersOfDecoratedDeclaration(node, container) {
-            if (container && node.kind === 156) {
+            if (container && node.kind === 156 /* GetAccessor */) {
                 var setAccessor = ts.getAllAccessorDeclarations(container.members, node).setAccessor;
                 if (setAccessor) {
                     return setAccessor.parameters;
@@ -51294,6 +62589,11 @@ var ts;
             }
             return node.parameters;
         }
+        /**
+         * Serializes the return type of a node for use with decorator type metadata.
+         *
+         * @param node The node that should have its return type serialized.
+         */
         function serializeReturnTypeOfNode(node) {
             if (ts.isFunctionLike(node) && node.type) {
                 return serializeTypeNode(node.type);
@@ -51303,62 +62603,81 @@ var ts;
             }
             return ts.createVoidZero();
         }
+        /**
+         * Serializes a type node for use with decorator type metadata.
+         *
+         * Types are serialized in the following fashion:
+         * - Void types point to "undefined" (e.g. "void 0")
+         * - Function and Constructor types point to the global "Function" constructor.
+         * - Interface types with a call or construct signature types point to the global
+         *   "Function" constructor.
+         * - Array and Tuple types point to the global "Array" constructor.
+         * - Type predicates and booleans point to the global "Boolean" constructor.
+         * - String literal types and strings point to the global "String" constructor.
+         * - Enum and number types point to the global "Number" constructor.
+         * - Symbol types point to the global "Symbol" constructor.
+         * - Type references to classes (or class-like variables) point to the constructor for the class.
+         * - Anything else points to the global "Object" constructor.
+         *
+         * @param node The type node to serialize.
+         */
         function serializeTypeNode(node) {
             if (node === undefined) {
                 return ts.createIdentifier("Object");
             }
             switch (node.kind) {
-                case 105:
-                case 140:
-                case 95:
-                case 131:
+                case 105 /* VoidKeyword */:
+                case 140 /* UndefinedKeyword */:
+                case 95 /* NullKeyword */:
+                case 131 /* NeverKeyword */:
                     return ts.createVoidZero();
-                case 173:
+                case 173 /* ParenthesizedType */:
                     return serializeTypeNode(node.type);
-                case 163:
-                case 164:
+                case 163 /* FunctionType */:
+                case 164 /* ConstructorType */:
                     return ts.createIdentifier("Function");
-                case 167:
-                case 168:
+                case 167 /* ArrayType */:
+                case 168 /* TupleType */:
                     return ts.createIdentifier("Array");
-                case 161:
-                case 122:
+                case 161 /* TypePredicate */:
+                case 122 /* BooleanKeyword */:
                     return ts.createIdentifier("Boolean");
-                case 137:
+                case 137 /* StringKeyword */:
                     return ts.createIdentifier("String");
-                case 135:
+                case 135 /* ObjectKeyword */:
                     return ts.createIdentifier("Object");
-                case 178:
+                case 178 /* LiteralType */:
                     switch (node.literal.kind) {
-                        case 9:
+                        case 9 /* StringLiteral */:
                             return ts.createIdentifier("String");
-                        case 8:
+                        case 8 /* NumericLiteral */:
                             return ts.createIdentifier("Number");
-                        case 101:
-                        case 86:
+                        case 101 /* TrueKeyword */:
+                        case 86 /* FalseKeyword */:
                             return ts.createIdentifier("Boolean");
                         default:
                             return ts.Debug.failBadSyntaxKind(node.literal);
                     }
-                case 134:
+                case 134 /* NumberKeyword */:
                     return ts.createIdentifier("Number");
-                case 138:
-                    return languageVersion < 2
+                case 138 /* SymbolKeyword */:
+                    return languageVersion < 2 /* ES2015 */
                         ? getGlobalSymbolNameWithFallback()
                         : ts.createIdentifier("Symbol");
-                case 162:
+                case 162 /* TypeReference */:
                     return serializeTypeReferenceNode(node);
-                case 170:
-                case 169:
+                case 170 /* IntersectionType */:
+                case 169 /* UnionType */:
                     return serializeUnionOrIntersectionType(node);
-                case 165:
-                case 175:
-                case 176:
-                case 177:
-                case 166:
-                case 119:
-                case 142:
-                case 174:
+                case 165 /* TypeQuery */:
+                case 175 /* TypeOperator */:
+                case 176 /* IndexedAccessType */:
+                case 177 /* MappedType */:
+                case 166 /* TypeLiteral */:
+                case 119 /* AnyKeyword */:
+                case 142 /* UnknownKeyword */:
+                case 174 /* ThisType */:
+                case 179 /* ImportType */:
                     break;
                 default:
                     return ts.Debug.failBadSyntaxKind(node);
@@ -51366,23 +62685,29 @@ var ts;
             return ts.createIdentifier("Object");
         }
         function serializeUnionOrIntersectionType(node) {
+            // Note when updating logic here also update getEntityNameForDecoratorMetadata
+            // so that aliases can be marked as referenced
             var serializedUnion;
             for (var _i = 0, _a = node.types; _i < _a.length; _i++) {
                 var typeNode = _a[_i];
-                while (typeNode.kind === 173) {
-                    typeNode = typeNode.type;
+                while (typeNode.kind === 173 /* ParenthesizedType */) {
+                    typeNode = typeNode.type; // Skip parens if need be
                 }
-                if (typeNode.kind === 131) {
-                    continue;
+                if (typeNode.kind === 131 /* NeverKeyword */) {
+                    continue; // Always elide `never` from the union/intersection if possible
                 }
-                if (!strictNullChecks && (typeNode.kind === 95 || typeNode.kind === 140)) {
-                    continue;
+                if (!strictNullChecks && (typeNode.kind === 95 /* NullKeyword */ || typeNode.kind === 140 /* UndefinedKeyword */)) {
+                    continue; // Elide null and undefined from unions for metadata, just like what we did prior to the implementation of strict null checks
                 }
                 var serializedIndividual = serializeTypeNode(typeNode);
                 if (ts.isIdentifier(serializedIndividual) && serializedIndividual.escapedText === "Object") {
+                    // One of the individual is global object, return immediately
                     return serializedIndividual;
                 }
+                // If there exists union that is not void 0 expression, check if the the common type is identifier.
+                // anything more complex and we will just default to Object
                 else if (serializedUnion) {
+                    // Different types
                     if (!ts.isIdentifier(serializedUnion) ||
                         !ts.isIdentifier(serializedIndividual) ||
                         serializedUnion.escapedText !== serializedIndividual.escapedText) {
@@ -51390,20 +62715,28 @@ var ts;
                     }
                 }
                 else {
+                    // Initialize the union type
                     serializedUnion = serializedIndividual;
                 }
             }
-            return serializedUnion || ts.createVoidZero();
+            // If we were able to find common type, use it
+            return serializedUnion || ts.createVoidZero(); // Fallback is only hit if all union constituients are null/undefined/never
         }
+        /**
+         * Serializes a TypeReferenceNode to an appropriate JS constructor value for use with
+         * decorator type metadata.
+         *
+         * @param node The type reference node.
+         */
         function serializeTypeReferenceNode(node) {
             var kind = resolver.getTypeReferenceSerializationKind(node.typeName, currentScope);
             switch (kind) {
                 case ts.TypeReferenceSerializationKind.Unknown:
-                    var serialized = serializeEntityNameAsExpression(node.typeName, true);
+                    var serialized = serializeEntityNameAsExpression(node.typeName, /*useFallback*/ true);
                     var temp = ts.createTempVariable(hoistVariableDeclaration);
                     return ts.createLogicalOr(ts.createLogicalAnd(ts.createTypeCheck(ts.createAssignment(temp, serialized), "function"), temp), ts.createIdentifier("Object"));
                 case ts.TypeReferenceSerializationKind.TypeWithConstructSignatureAndValue:
-                    return serializeEntityNameAsExpression(node.typeName, false);
+                    return serializeEntityNameAsExpression(node.typeName, /*useFallback*/ false);
                 case ts.TypeReferenceSerializationKind.VoidNullableOrNeverType:
                     return ts.createVoidZero();
                 case ts.TypeReferenceSerializationKind.BooleanType:
@@ -51415,7 +62748,7 @@ var ts;
                 case ts.TypeReferenceSerializationKind.ArrayLikeType:
                     return ts.createIdentifier("Array");
                 case ts.TypeReferenceSerializationKind.ESSymbolType:
-                    return languageVersion < 2
+                    return languageVersion < 2 /* ES2015 */
                         ? getGlobalSymbolNameWithFallback()
                         : ts.createIdentifier("Symbol");
                 case ts.TypeReferenceSerializationKind.TypeWithCallSignature:
@@ -51428,42 +62761,73 @@ var ts;
                     return ts.Debug.assertNever(kind);
             }
         }
+        /**
+         * Serializes an entity name as an expression for decorator type metadata.
+         *
+         * @param node The entity name to serialize.
+         * @param useFallback A value indicating whether to use logical operators to test for the
+         *                    entity name at runtime.
+         */
         function serializeEntityNameAsExpression(node, useFallback) {
             switch (node.kind) {
-                case 71:
+                case 71 /* Identifier */:
+                    // Create a clone of the name with a new parent, and treat it as if it were
+                    // a source tree node for the purposes of the checker.
                     var name = ts.getMutableClone(node);
-                    name.flags &= ~8;
+                    name.flags &= ~8 /* Synthesized */;
                     name.original = undefined;
-                    name.parent = ts.getParseTreeNode(currentScope);
+                    name.parent = ts.getParseTreeNode(currentScope); // ensure the parent is set to a parse tree node.
                     if (useFallback) {
                         return ts.createLogicalAnd(ts.createStrictInequality(ts.createTypeOf(name), ts.createLiteral("undefined")), name);
                     }
                     return name;
-                case 146:
+                case 146 /* QualifiedName */:
                     return serializeQualifiedNameAsExpression(node, useFallback);
             }
         }
+        /**
+         * Serializes an qualified name as an expression for decorator type metadata.
+         *
+         * @param node The qualified name to serialize.
+         * @param useFallback A value indicating whether to use logical operators to test for the
+         *                    qualified name at runtime.
+         */
         function serializeQualifiedNameAsExpression(node, useFallback) {
             var left;
-            if (node.left.kind === 71) {
+            if (node.left.kind === 71 /* Identifier */) {
                 left = serializeEntityNameAsExpression(node.left, useFallback);
             }
             else if (useFallback) {
                 var temp = ts.createTempVariable(hoistVariableDeclaration);
-                left = ts.createLogicalAnd(ts.createAssignment(temp, serializeEntityNameAsExpression(node.left, true)), temp);
+                left = ts.createLogicalAnd(ts.createAssignment(temp, serializeEntityNameAsExpression(node.left, /*useFallback*/ true)), temp);
             }
             else {
-                left = serializeEntityNameAsExpression(node.left, false);
+                left = serializeEntityNameAsExpression(node.left, /*useFallback*/ false);
             }
             return ts.createPropertyAccess(left, node.right);
         }
+        /**
+         * Gets an expression that points to the global "Symbol" constructor at runtime if it is
+         * available.
+         */
         function getGlobalSymbolNameWithFallback() {
             return ts.createConditional(ts.createTypeCheck(ts.createIdentifier("Symbol"), "function"), ts.createIdentifier("Symbol"), ts.createIdentifier("Object"));
         }
+        /**
+         * A simple inlinable expression is an expression which can be copied into multiple locations
+         * without risk of repeating any sideeffects and whose value could not possibly change between
+         * any such locations
+         */
         function isSimpleInlineableExpression(expression) {
             return !ts.isIdentifier(expression) && ts.isSimpleCopiableExpression(expression) ||
                 ts.isWellKnownSymbolSyntactically(expression);
         }
+        /**
+         * Gets an expression that represents a property name. For a computed property, a
+         * name is generated for the node.
+         *
+         * @param member The member whose name should be converted into an expression.
+         */
         function getExpressionForPropertyName(member, generateNameForComputedPropertyName) {
             var name = member.name;
             if (ts.isComputedPropertyName(name)) {
@@ -51478,6 +62842,12 @@ var ts;
                 return ts.getSynthesizedClone(name);
             }
         }
+        /**
+         * If the name is a computed property, this function transforms it, then either returns an expression which caches the
+         * value of the result or the expression itself if the value is either unused or safe to inline into multiple locations
+         * @param shouldHoist Does the expression need to be reused? (ie, for an initializer or a decorator)
+         * @param omitSimple Should expressions with no observable side-effects be elided? (ie, the expression is not hoisted for a decorator or initializer and is a literal)
+         */
         function getPropertyNameExpressionIfNeeded(name, shouldHoist, omitSimple) {
             if (ts.isComputedPropertyName(name)) {
                 var expression = ts.visitNode(name.expression, visitor, ts.isExpression);
@@ -51491,10 +62861,18 @@ var ts;
                 return (omitSimple && (inlinable || ts.isIdentifier(innerExpression))) ? undefined : expression;
             }
         }
+        /**
+         * Visits the property name of a class element, for use when emitting property
+         * initializers. For a computed property on a node with decorators, a temporary
+         * value is stored for later use.
+         *
+         * @param member The member whose name should be visited.
+         */
         function visitPropertyNameOfClassElement(member) {
             var name = member.name;
-            var expr = getPropertyNameExpressionIfNeeded(name, ts.some(member.decorators), false);
-            if (expr) {
+            var expr = getPropertyNameExpressionIfNeeded(name, ts.some(member.decorators), /*omitSimple*/ false);
+            if (expr) { // expr only exists if `name` is a computed property name
+                // Inline any pending expressions from previous elided or relocated computed property name expressions in order to preserve execution order
                 if (ts.some(pendingExpressions)) {
                     expr = ts.inlineExpressions(pendingExpressions.concat([expr]));
                     pendingExpressions.length = 0;
@@ -51505,21 +62883,45 @@ var ts;
                 return name;
             }
         }
+        /**
+         * Transforms a HeritageClause with TypeScript syntax.
+         *
+         * This function will only be called when one of the following conditions are met:
+         * - The node is a non-`extends` heritage clause that should be elided.
+         * - The node is an `extends` heritage clause that should be visited, but only allow a single type.
+         *
+         * @param node The HeritageClause to transform.
+         */
         function visitHeritageClause(node) {
-            if (node.token === 85) {
+            if (node.token === 85 /* ExtendsKeyword */) {
                 var types = ts.visitNodes(node.types, visitor, ts.isExpressionWithTypeArguments, 0, 1);
-                return ts.setTextRange(ts.createHeritageClause(85, types), node);
+                return ts.setTextRange(ts.createHeritageClause(85 /* ExtendsKeyword */, types), node);
             }
             return undefined;
         }
+        /**
+         * Transforms an ExpressionWithTypeArguments with TypeScript syntax.
+         *
+         * This function will only be called when one of the following conditions are met:
+         * - The node contains type arguments that should be elided.
+         *
+         * @param node The ExpressionWithTypeArguments to transform.
+         */
         function visitExpressionWithTypeArguments(node) {
-            return ts.updateExpressionWithTypeArguments(node, undefined, ts.visitNode(node.expression, visitor, ts.isLeftHandSideExpression));
+            return ts.updateExpressionWithTypeArguments(node, 
+            /*typeArguments*/ undefined, ts.visitNode(node.expression, visitor, ts.isLeftHandSideExpression));
         }
+        /**
+         * Determines whether to emit a function-like declaration. We should not emit the
+         * declaration if it does not have a body.
+         *
+         * @param node The declaration node.
+         */
         function shouldEmitFunctionLikeDeclaration(node) {
             return !ts.nodeIsMissing(node.body);
         }
         function visitPropertyDeclaration(node) {
-            var expr = getPropertyNameExpressionIfNeeded(node.name, ts.some(node.decorators) || !!node.initializer, true);
+            var expr = getPropertyNameExpressionIfNeeded(node.name, ts.some(node.decorators) || !!node.initializer, /*omitSimple*/ true);
             if (expr && !isSimpleInlineableExpression(expr)) {
                 (pendingExpressions || (pendingExpressions = [])).push(expr);
             }
@@ -51531,47 +62933,107 @@ var ts;
             }
             return ts.updateConstructor(node, ts.visitNodes(node.decorators, visitor, ts.isDecorator), ts.visitNodes(node.modifiers, visitor, ts.isModifier), ts.visitParameterList(node.parameters, visitor, context), ts.visitFunctionBody(node.body, visitor, context));
         }
+        /**
+         * Visits a method declaration of a class.
+         *
+         * This function will be called when one of the following conditions are met:
+         * - The node is an overload
+         * - The node is marked as abstract, public, private, protected, or readonly
+         * - The node has a computed property name
+         *
+         * @param node The method node.
+         */
         function visitMethodDeclaration(node) {
             if (!shouldEmitFunctionLikeDeclaration(node)) {
                 return undefined;
             }
-            var updated = ts.updateMethod(node, undefined, ts.visitNodes(node.modifiers, modifierVisitor, ts.isModifier), node.asteriskToken, visitPropertyNameOfClassElement(node), undefined, undefined, ts.visitParameterList(node.parameters, visitor, context), undefined, ts.visitFunctionBody(node.body, visitor, context));
+            var updated = ts.updateMethod(node, 
+            /*decorators*/ undefined, ts.visitNodes(node.modifiers, modifierVisitor, ts.isModifier), node.asteriskToken, visitPropertyNameOfClassElement(node), 
+            /*questionToken*/ undefined, 
+            /*typeParameters*/ undefined, ts.visitParameterList(node.parameters, visitor, context), 
+            /*type*/ undefined, ts.visitFunctionBody(node.body, visitor, context));
             if (updated !== node) {
+                // While we emit the source map for the node after skipping decorators and modifiers,
+                // we need to emit the comments for the original range.
                 ts.setCommentRange(updated, node);
                 ts.setSourceMapRange(updated, ts.moveRangePastDecorators(node));
             }
             return updated;
         }
+        /**
+         * Determines whether to emit an accessor declaration. We should not emit the
+         * declaration if it does not have a body and is abstract.
+         *
+         * @param node The declaration node.
+         */
         function shouldEmitAccessorDeclaration(node) {
-            return !(ts.nodeIsMissing(node.body) && ts.hasModifier(node, 128));
+            return !(ts.nodeIsMissing(node.body) && ts.hasModifier(node, 128 /* Abstract */));
         }
+        /**
+         * Visits a get accessor declaration of a class.
+         *
+         * This function will be called when one of the following conditions are met:
+         * - The node is marked as abstract, public, private, or protected
+         * - The node has a computed property name
+         *
+         * @param node The get accessor node.
+         */
         function visitGetAccessor(node) {
             if (!shouldEmitAccessorDeclaration(node)) {
                 return undefined;
             }
-            var updated = ts.updateGetAccessor(node, undefined, ts.visitNodes(node.modifiers, modifierVisitor, ts.isModifier), visitPropertyNameOfClassElement(node), ts.visitParameterList(node.parameters, visitor, context), undefined, ts.visitFunctionBody(node.body, visitor, context) || ts.createBlock([]));
+            var updated = ts.updateGetAccessor(node, 
+            /*decorators*/ undefined, ts.visitNodes(node.modifiers, modifierVisitor, ts.isModifier), visitPropertyNameOfClassElement(node), ts.visitParameterList(node.parameters, visitor, context), 
+            /*type*/ undefined, ts.visitFunctionBody(node.body, visitor, context) || ts.createBlock([]));
             if (updated !== node) {
+                // While we emit the source map for the node after skipping decorators and modifiers,
+                // we need to emit the comments for the original range.
                 ts.setCommentRange(updated, node);
                 ts.setSourceMapRange(updated, ts.moveRangePastDecorators(node));
             }
             return updated;
         }
+        /**
+         * Visits a set accessor declaration of a class.
+         *
+         * This function will be called when one of the following conditions are met:
+         * - The node is marked as abstract, public, private, or protected
+         * - The node has a computed property name
+         *
+         * @param node The set accessor node.
+         */
         function visitSetAccessor(node) {
             if (!shouldEmitAccessorDeclaration(node)) {
                 return undefined;
             }
-            var updated = ts.updateSetAccessor(node, undefined, ts.visitNodes(node.modifiers, modifierVisitor, ts.isModifier), visitPropertyNameOfClassElement(node), ts.visitParameterList(node.parameters, visitor, context), ts.visitFunctionBody(node.body, visitor, context) || ts.createBlock([]));
+            var updated = ts.updateSetAccessor(node, 
+            /*decorators*/ undefined, ts.visitNodes(node.modifiers, modifierVisitor, ts.isModifier), visitPropertyNameOfClassElement(node), ts.visitParameterList(node.parameters, visitor, context), ts.visitFunctionBody(node.body, visitor, context) || ts.createBlock([]));
             if (updated !== node) {
+                // While we emit the source map for the node after skipping decorators and modifiers,
+                // we need to emit the comments for the original range.
                 ts.setCommentRange(updated, node);
                 ts.setSourceMapRange(updated, ts.moveRangePastDecorators(node));
             }
             return updated;
         }
+        /**
+         * Visits a function declaration.
+         *
+         * This function will be called when one of the following conditions are met:
+         * - The node is an overload
+         * - The node is exported from a TypeScript namespace
+         * - The node has decorators
+         *
+         * @param node The function node.
+         */
         function visitFunctionDeclaration(node) {
             if (!shouldEmitFunctionLikeDeclaration(node)) {
                 return ts.createNotEmittedStatement(node);
             }
-            var updated = ts.updateFunctionDeclaration(node, undefined, ts.visitNodes(node.modifiers, modifierVisitor, ts.isModifier), node.asteriskToken, node.name, undefined, ts.visitParameterList(node.parameters, visitor, context), undefined, ts.visitFunctionBody(node.body, visitor, context) || ts.createBlock([]));
+            var updated = ts.updateFunctionDeclaration(node, 
+            /*decorators*/ undefined, ts.visitNodes(node.modifiers, modifierVisitor, ts.isModifier), node.asteriskToken, node.name, 
+            /*typeParameters*/ undefined, ts.visitParameterList(node.parameters, visitor, context), 
+            /*type*/ undefined, ts.visitFunctionBody(node.body, visitor, context) || ts.createBlock([]));
             if (isExportOfNamespace(node)) {
                 var statements = [updated];
                 addExportMemberAssignment(statements, node);
@@ -51579,33 +63041,73 @@ var ts;
             }
             return updated;
         }
+        /**
+         * Visits a function expression node.
+         *
+         * This function will be called when one of the following conditions are met:
+         * - The node has type annotations
+         *
+         * @param node The function expression node.
+         */
         function visitFunctionExpression(node) {
             if (!shouldEmitFunctionLikeDeclaration(node)) {
                 return ts.createOmittedExpression();
             }
-            var updated = ts.updateFunctionExpression(node, ts.visitNodes(node.modifiers, modifierVisitor, ts.isModifier), node.asteriskToken, node.name, undefined, ts.visitParameterList(node.parameters, visitor, context), undefined, ts.visitFunctionBody(node.body, visitor, context) || ts.createBlock([]));
+            var updated = ts.updateFunctionExpression(node, ts.visitNodes(node.modifiers, modifierVisitor, ts.isModifier), node.asteriskToken, node.name, 
+            /*typeParameters*/ undefined, ts.visitParameterList(node.parameters, visitor, context), 
+            /*type*/ undefined, ts.visitFunctionBody(node.body, visitor, context) || ts.createBlock([]));
             return updated;
         }
+        /**
+         * @remarks
+         * This function will be called when one of the following conditions are met:
+         * - The node has type annotations
+         */
         function visitArrowFunction(node) {
-            var updated = ts.updateArrowFunction(node, ts.visitNodes(node.modifiers, modifierVisitor, ts.isModifier), undefined, ts.visitParameterList(node.parameters, visitor, context), undefined, node.equalsGreaterThanToken, ts.visitFunctionBody(node.body, visitor, context));
+            var updated = ts.updateArrowFunction(node, ts.visitNodes(node.modifiers, modifierVisitor, ts.isModifier), 
+            /*typeParameters*/ undefined, ts.visitParameterList(node.parameters, visitor, context), 
+            /*type*/ undefined, node.equalsGreaterThanToken, ts.visitFunctionBody(node.body, visitor, context));
             return updated;
         }
+        /**
+         * Visits a parameter declaration node.
+         *
+         * This function will be called when one of the following conditions are met:
+         * - The node has an accessibility modifier.
+         * - The node has a questionToken.
+         * - The node's kind is ThisKeyword.
+         *
+         * @param node The parameter declaration node.
+         */
         function visitParameter(node) {
             if (ts.parameterIsThisKeyword(node)) {
                 return undefined;
             }
-            var parameter = ts.createParameter(undefined, undefined, node.dotDotDotToken, ts.visitNode(node.name, visitor, ts.isBindingName), undefined, undefined, ts.visitNode(node.initializer, visitor, ts.isExpression));
+            var parameter = ts.createParameter(
+            /*decorators*/ undefined, 
+            /*modifiers*/ undefined, node.dotDotDotToken, ts.visitNode(node.name, visitor, ts.isBindingName), 
+            /*questionToken*/ undefined, 
+            /*type*/ undefined, ts.visitNode(node.initializer, visitor, ts.isExpression));
+            // While we emit the source map for the node after skipping decorators and modifiers,
+            // we need to emit the comments for the original range.
             ts.setOriginalNode(parameter, node);
             ts.setTextRange(parameter, ts.moveRangePastModifiers(node));
             ts.setCommentRange(parameter, node);
             ts.setSourceMapRange(parameter, ts.moveRangePastModifiers(node));
-            ts.setEmitFlags(parameter.name, 32);
+            ts.setEmitFlags(parameter.name, 32 /* NoTrailingSourceMap */);
             return parameter;
         }
+        /**
+         * Visits a variable statement in a namespace.
+         *
+         * This function will be called when one of the following conditions are met:
+         * - The node is exported from a TypeScript namespace.
+         */
         function visitVariableStatement(node) {
             if (isExportOfNamespace(node)) {
                 var variables = ts.getInitializedVariables(node.declarationList);
                 if (variables.length === 0) {
+                    // elide statement if there are no initialized variables.
                     return undefined;
                 }
                 return ts.setTextRange(ts.createStatement(ts.inlineExpressions(ts.map(variables, transformInitializedVariable))), node);
@@ -51617,19 +63119,45 @@ var ts;
         function transformInitializedVariable(node) {
             var name = node.name;
             if (ts.isBindingPattern(name)) {
-                return ts.flattenDestructuringAssignment(node, visitor, context, 0, false, createNamespaceExportExpression);
+                return ts.flattenDestructuringAssignment(node, visitor, context, 0 /* All */, 
+                /*needsValue*/ false, createNamespaceExportExpression);
             }
             else {
-                return ts.setTextRange(ts.createAssignment(getNamespaceMemberNameWithSourceMapsAndWithoutComments(name), ts.visitNode(node.initializer, visitor, ts.isExpression)), node);
+                return ts.setTextRange(ts.createAssignment(getNamespaceMemberNameWithSourceMapsAndWithoutComments(name), ts.visitNode(node.initializer, visitor, ts.isExpression)), 
+                /*location*/ node);
             }
         }
         function visitVariableDeclaration(node) {
-            return ts.updateVariableDeclaration(node, ts.visitNode(node.name, visitor, ts.isBindingName), undefined, ts.visitNode(node.initializer, visitor, ts.isExpression));
+            return ts.updateVariableDeclaration(node, ts.visitNode(node.name, visitor, ts.isBindingName), 
+            /*type*/ undefined, ts.visitNode(node.initializer, visitor, ts.isExpression));
         }
+        /**
+         * Visits a parenthesized expression that contains either a type assertion or an `as`
+         * expression.
+         *
+         * @param node The parenthesized expression node.
+         */
         function visitParenthesizedExpression(node) {
-            var innerExpression = ts.skipOuterExpressions(node.expression, ~2);
+            var innerExpression = ts.skipOuterExpressions(node.expression, ~2 /* Assertions */);
             if (ts.isAssertionExpression(innerExpression)) {
+                // Make sure we consider all nested cast expressions, e.g.:
+                // (<any><number><any>-A).x;
                 var expression = ts.visitNode(node.expression, visitor, ts.isExpression);
+                // We have an expression of the form: (<Type>SubExpr). Emitting this as (SubExpr)
+                // is really not desirable. We would like to emit the subexpression as-is. Omitting
+                // the parentheses, however, could cause change in the semantics of the generated
+                // code if the casted expression has a lower precedence than the rest of the
+                // expression.
+                //
+                // To preserve comments, we return a "PartiallyEmittedExpression" here which will
+                // preserve the position information of the original expression.
+                //
+                // Due to the auto-parenthesization rules used by the visitor and factory functions
+                // we can safely elide the parentheses here, as a new synthetic
+                // ParenthesizedExpression will be inserted if we remove parentheses too
+                // aggressively.
+                // HOWEVER - if there are leading comments on the expression itself, to handle ASI
+                // correctly for return and throw, we must keep the parenthesis
                 if (ts.length(ts.getLeadingCommentRangesOfNode(expression, currentSourceFile))) {
                     return ts.updateParen(node, expression);
                 }
@@ -51646,48 +63174,93 @@ var ts;
             return ts.createPartiallyEmittedExpression(expression, node);
         }
         function visitCallExpression(node) {
-            return ts.updateCall(node, ts.visitNode(node.expression, visitor, ts.isExpression), undefined, ts.visitNodes(node.arguments, visitor, ts.isExpression));
+            return ts.updateCall(node, ts.visitNode(node.expression, visitor, ts.isExpression), 
+            /*typeArguments*/ undefined, ts.visitNodes(node.arguments, visitor, ts.isExpression));
         }
         function visitNewExpression(node) {
-            return ts.updateNew(node, ts.visitNode(node.expression, visitor, ts.isExpression), undefined, ts.visitNodes(node.arguments, visitor, ts.isExpression));
+            return ts.updateNew(node, ts.visitNode(node.expression, visitor, ts.isExpression), 
+            /*typeArguments*/ undefined, ts.visitNodes(node.arguments, visitor, ts.isExpression));
         }
         function visitTaggedTemplateExpression(node) {
-            return ts.updateTaggedTemplate(node, ts.visitNode(node.tag, visitor, ts.isExpression), undefined, ts.visitNode(node.template, visitor, ts.isExpression));
+            return ts.updateTaggedTemplate(node, ts.visitNode(node.tag, visitor, ts.isExpression), 
+            /*typeArguments*/ undefined, ts.visitNode(node.template, visitor, ts.isExpression));
         }
+        /**
+         * Determines whether to emit an enum declaration.
+         *
+         * @param node The enum declaration node.
+         */
         function shouldEmitEnumDeclaration(node) {
             return !ts.isConst(node)
                 || compilerOptions.preserveConstEnums
                 || compilerOptions.isolatedModules;
         }
+        /**
+         * Visits an enum declaration.
+         *
+         * This function will be called any time a TypeScript enum is encountered.
+         *
+         * @param node The enum declaration node.
+         */
         function visitEnumDeclaration(node) {
             if (!shouldEmitEnumDeclaration(node)) {
                 return undefined;
             }
             var statements = [];
-            var emitFlags = 2;
+            // We request to be advised when the printer is about to print this node. This allows
+            // us to set up the correct state for later substitutions.
+            var emitFlags = 2 /* AdviseOnEmitNode */;
+            // If needed, we should emit a variable declaration for the enum. If we emit
+            // a leading variable declaration, we should not emit leading comments for the
+            // enum body.
             if (addVarForEnumOrModuleDeclaration(statements, node)) {
+                // We should still emit the comments if we are emitting a system module.
                 if (moduleKind !== ts.ModuleKind.System || currentScope !== currentSourceFile) {
-                    emitFlags |= 512;
+                    emitFlags |= 512 /* NoLeadingComments */;
                 }
             }
+            // `parameterName` is the declaration name used inside of the enum.
             var parameterName = getNamespaceParameterName(node);
+            // `containerName` is the expression used inside of the enum for assignments.
             var containerName = getNamespaceContainerName(node);
-            var exportName = ts.hasModifier(node, 1)
-                ? ts.getExternalModuleOrNamespaceExportName(currentNamespaceContainerName, node, false, true)
-                : ts.getLocalName(node, false, true);
+            // `exportName` is the expression used within this node's container for any exported references.
+            var exportName = ts.hasModifier(node, 1 /* Export */)
+                ? ts.getExternalModuleOrNamespaceExportName(currentNamespaceContainerName, node, /*allowComments*/ false, /*allowSourceMaps*/ true)
+                : ts.getLocalName(node, /*allowComments*/ false, /*allowSourceMaps*/ true);
+            //  x || (x = {})
+            //  exports.x || (exports.x = {})
             var moduleArg = ts.createLogicalOr(exportName, ts.createAssignment(exportName, ts.createObjectLiteral()));
             if (hasNamespaceQualifiedExportName(node)) {
-                var localName = ts.getLocalName(node, false, true);
+                // `localName` is the expression used within this node's containing scope for any local references.
+                var localName = ts.getLocalName(node, /*allowComments*/ false, /*allowSourceMaps*/ true);
+                //  x = (exports.x || (exports.x = {}))
                 moduleArg = ts.createAssignment(localName, moduleArg);
             }
-            var enumStatement = ts.createStatement(ts.createCall(ts.createFunctionExpression(undefined, undefined, undefined, undefined, [ts.createParameter(undefined, undefined, undefined, parameterName)], undefined, transformEnumBody(node, containerName)), undefined, [moduleArg]));
+            //  (function (x) {
+            //      x[x["y"] = 0] = "y";
+            //      ...
+            //  })(x || (x = {}));
+            var enumStatement = ts.createStatement(ts.createCall(ts.createFunctionExpression(
+            /*modifiers*/ undefined, 
+            /*asteriskToken*/ undefined, 
+            /*name*/ undefined, 
+            /*typeParameters*/ undefined, [ts.createParameter(/*decorators*/ undefined, /*modifiers*/ undefined, /*dotDotDotToken*/ undefined, parameterName)], 
+            /*type*/ undefined, transformEnumBody(node, containerName)), 
+            /*typeArguments*/ undefined, [moduleArg]));
             ts.setOriginalNode(enumStatement, node);
             ts.setTextRange(enumStatement, node);
             ts.setEmitFlags(enumStatement, emitFlags);
             statements.push(enumStatement);
+            // Add a DeclarationMarker for the enum to preserve trailing comments and mark
+            // the end of the declaration.
             statements.push(ts.createEndOfDeclarationMarker(node));
             return statements;
         }
+        /**
+         * Transforms the body of an enum declaration.
+         *
+         * @param node The enum declaration node.
+         */
         function transformEnumBody(node, localName) {
             var savedCurrentNamespaceLocalName = currentNamespaceContainerName;
             currentNamespaceContainerName = localName;
@@ -51697,17 +63270,31 @@ var ts;
             ts.prependStatements(statements, endLexicalEnvironment());
             ts.addRange(statements, members);
             currentNamespaceContainerName = savedCurrentNamespaceLocalName;
-            return ts.createBlock(ts.setTextRange(ts.createNodeArray(statements), node.members), true);
+            return ts.createBlock(ts.setTextRange(ts.createNodeArray(statements), /*location*/ node.members), 
+            /*multiLine*/ true);
         }
+        /**
+         * Transforms an enum member into a statement.
+         *
+         * @param member The enum member node.
+         */
         function transformEnumMember(member) {
-            var name = getExpressionForPropertyName(member, false);
+            // enums don't support computed properties
+            // we pass false as 'generateNameForComputedPropertyName' for a backward compatibility purposes
+            // old emitter always generate 'expression' part of the name as-is.
+            var name = getExpressionForPropertyName(member, /*generateNameForComputedPropertyName*/ false);
             var valueExpression = transformEnumMemberDeclarationValue(member);
             var innerAssignment = ts.createAssignment(ts.createElementAccess(currentNamespaceContainerName, name), valueExpression);
-            var outerAssignment = valueExpression.kind === 9 ?
+            var outerAssignment = valueExpression.kind === 9 /* StringLiteral */ ?
                 innerAssignment :
                 ts.createAssignment(ts.createElementAccess(currentNamespaceContainerName, innerAssignment), name);
             return ts.setTextRange(ts.createStatement(ts.setTextRange(outerAssignment, member)), member);
         }
+        /**
+         * Transforms the value of an enum member.
+         *
+         * @param member The enum member node.
+         */
         function transformEnumMemberDeclarationValue(member) {
             var value = resolver.getConstantValue(member);
             if (value !== undefined) {
@@ -51723,9 +63310,18 @@ var ts;
                 }
             }
         }
+        /**
+         * Determines whether to elide a module declaration.
+         *
+         * @param node The module declaration node.
+         */
         function shouldEmitModuleDeclaration(node) {
             return ts.isInstantiatedModule(node, !!compilerOptions.preserveConstEnums || !!compilerOptions.isolatedModules);
         }
+        /**
+         * Determines whether an exported declaration will have a qualified export name (e.g. `f.x`
+         * or `exports.x`).
+         */
         function hasNamespaceQualifiedExportName(node) {
             return isExportOfNamespace(node)
                 || (isExternalModuleExport(node)
@@ -51733,6 +63329,10 @@ var ts;
                     && moduleKind !== ts.ModuleKind.ESNext
                     && moduleKind !== ts.ModuleKind.System);
         }
+        /**
+         * Records that a declaration was emitted in the current scope, if it was the first
+         * declaration for the provided symbol.
+         */
         function recordEmittedDeclarationInScope(node) {
             if (!currentScopeFirstDeclarationsOfName) {
                 currentScopeFirstDeclarationsOfName = ts.createUnderscoreEscapedMap();
@@ -51742,6 +63342,10 @@ var ts;
                 currentScopeFirstDeclarationsOfName.set(name, node);
             }
         }
+        /**
+         * Determines whether a declaration is the first declaration with
+         * the same name emitted in the current scope.
+         */
         function isFirstEmittedDeclarationInScope(node) {
             if (currentScopeFirstDeclarationsOfName) {
                 var name = declaredNameInScope(node);
@@ -51753,31 +63357,67 @@ var ts;
             ts.Debug.assertNode(node.name, ts.isIdentifier);
             return node.name.escapedText;
         }
+        /**
+         * Adds a leading VariableStatement for a enum or module declaration.
+         */
         function addVarForEnumOrModuleDeclaration(statements, node) {
+            // Emit a variable statement for the module. We emit top-level enums as a `var`
+            // declaration to avoid static errors in global scripts scripts due to redeclaration.
+            // enums in any other scope are emitted as a `let` declaration.
             var statement = ts.createVariableStatement(ts.visitNodes(node.modifiers, modifierVisitor, ts.isModifier), ts.createVariableDeclarationList([
-                ts.createVariableDeclaration(ts.getLocalName(node, false, true))
-            ], currentScope.kind === 274 ? 0 : 1));
+                ts.createVariableDeclaration(ts.getLocalName(node, /*allowComments*/ false, /*allowSourceMaps*/ true))
+            ], currentScope.kind === 274 /* SourceFile */ ? 0 /* None */ : 1 /* Let */));
             ts.setOriginalNode(statement, node);
             recordEmittedDeclarationInScope(node);
             if (isFirstEmittedDeclarationInScope(node)) {
-                if (node.kind === 238) {
+                // Adjust the source map emit to match the old emitter.
+                if (node.kind === 238 /* EnumDeclaration */) {
                     ts.setSourceMapRange(statement.declarationList, node);
                 }
                 else {
                     ts.setSourceMapRange(statement, node);
                 }
+                // Trailing comments for module declaration should be emitted after the function closure
+                // instead of the variable statement:
+                //
+                //     /** Module comment*/
+                //     module m1 {
+                //         function foo4Export() {
+                //         }
+                //     } // trailing comment module
+                //
+                // Should emit:
+                //
+                //     /** Module comment*/
+                //     var m1;
+                //     (function (m1) {
+                //         function foo4Export() {
+                //         }
+                //     })(m1 || (m1 = {})); // trailing comment module
+                //
                 ts.setCommentRange(statement, node);
-                ts.setEmitFlags(statement, 1024 | 4194304);
+                ts.setEmitFlags(statement, 1024 /* NoTrailingComments */ | 4194304 /* HasEndOfDeclarationMarker */);
                 statements.push(statement);
                 return true;
             }
             else {
+                // For an EnumDeclaration or ModuleDeclaration that merges with a preceeding
+                // declaration we do not emit a leading variable declaration. To preserve the
+                // begin/end semantics of the declararation and to properly handle exports
+                // we wrap the leading variable declaration in a `MergeDeclarationMarker`.
                 var mergeMarker = ts.createMergeDeclarationMarker(statement);
-                ts.setEmitFlags(mergeMarker, 1536 | 4194304);
+                ts.setEmitFlags(mergeMarker, 1536 /* NoComments */ | 4194304 /* HasEndOfDeclarationMarker */);
                 statements.push(mergeMarker);
                 return false;
             }
         }
+        /**
+         * Visits a module declaration node.
+         *
+         * This function will be called any time a TypeScript namespace (ModuleDeclaration) is encountered.
+         *
+         * @param node The module declaration node.
+         */
         function visitModuleDeclaration(node) {
             if (!shouldEmitModuleDeclaration(node)) {
                 return ts.createNotEmittedStatement(node);
@@ -51785,30 +63425,59 @@ var ts;
             ts.Debug.assertNode(node.name, ts.isIdentifier, "A TypeScript namespace should have an Identifier name.");
             enableSubstitutionForNamespaceExports();
             var statements = [];
-            var emitFlags = 2;
+            // We request to be advised when the printer is about to print this node. This allows
+            // us to set up the correct state for later substitutions.
+            var emitFlags = 2 /* AdviseOnEmitNode */;
+            // If needed, we should emit a variable declaration for the module. If we emit
+            // a leading variable declaration, we should not emit leading comments for the
+            // module body.
             if (addVarForEnumOrModuleDeclaration(statements, node)) {
+                // We should still emit the comments if we are emitting a system module.
                 if (moduleKind !== ts.ModuleKind.System || currentScope !== currentSourceFile) {
-                    emitFlags |= 512;
+                    emitFlags |= 512 /* NoLeadingComments */;
                 }
             }
+            // `parameterName` is the declaration name used inside of the namespace.
             var parameterName = getNamespaceParameterName(node);
+            // `containerName` is the expression used inside of the namespace for exports.
             var containerName = getNamespaceContainerName(node);
-            var exportName = ts.hasModifier(node, 1)
-                ? ts.getExternalModuleOrNamespaceExportName(currentNamespaceContainerName, node, false, true)
-                : ts.getLocalName(node, false, true);
+            // `exportName` is the expression used within this node's container for any exported references.
+            var exportName = ts.hasModifier(node, 1 /* Export */)
+                ? ts.getExternalModuleOrNamespaceExportName(currentNamespaceContainerName, node, /*allowComments*/ false, /*allowSourceMaps*/ true)
+                : ts.getLocalName(node, /*allowComments*/ false, /*allowSourceMaps*/ true);
+            //  x || (x = {})
+            //  exports.x || (exports.x = {})
             var moduleArg = ts.createLogicalOr(exportName, ts.createAssignment(exportName, ts.createObjectLiteral()));
             if (hasNamespaceQualifiedExportName(node)) {
-                var localName = ts.getLocalName(node, false, true);
+                // `localName` is the expression used within this node's containing scope for any local references.
+                var localName = ts.getLocalName(node, /*allowComments*/ false, /*allowSourceMaps*/ true);
+                //  x = (exports.x || (exports.x = {}))
                 moduleArg = ts.createAssignment(localName, moduleArg);
             }
-            var moduleStatement = ts.createStatement(ts.createCall(ts.createFunctionExpression(undefined, undefined, undefined, undefined, [ts.createParameter(undefined, undefined, undefined, parameterName)], undefined, transformModuleBody(node, containerName)), undefined, [moduleArg]));
+            //  (function (x_1) {
+            //      x_1.y = ...;
+            //  })(x || (x = {}));
+            var moduleStatement = ts.createStatement(ts.createCall(ts.createFunctionExpression(
+            /*modifiers*/ undefined, 
+            /*asteriskToken*/ undefined, 
+            /*name*/ undefined, 
+            /*typeParameters*/ undefined, [ts.createParameter(/*decorators*/ undefined, /*modifiers*/ undefined, /*dotDotDotToken*/ undefined, parameterName)], 
+            /*type*/ undefined, transformModuleBody(node, containerName)), 
+            /*typeArguments*/ undefined, [moduleArg]));
             ts.setOriginalNode(moduleStatement, node);
             ts.setTextRange(moduleStatement, node);
             ts.setEmitFlags(moduleStatement, emitFlags);
             statements.push(moduleStatement);
+            // Add a DeclarationMarker for the namespace to preserve trailing comments and mark
+            // the end of the declaration.
             statements.push(ts.createEndOfDeclarationMarker(node));
             return statements;
         }
+        /**
+         * Transforms the body of a module declaration.
+         *
+         * @param node The module declaration node.
+         */
         function transformModuleBody(node, namespaceLocalName) {
             var savedCurrentNamespaceContainerName = currentNamespaceContainerName;
             var savedCurrentNamespace = currentNamespace;
@@ -51821,7 +63490,7 @@ var ts;
             var statementsLocation;
             var blockLocation;
             var body = node.body;
-            if (body.kind === 240) {
+            if (body.kind === 240 /* ModuleBlock */) {
                 saveStateAndInvoke(body, function (body) { return ts.addRange(statements, ts.visitNodes(body.statements, namespaceElementVisitor, ts.isStatement)); });
                 statementsLocation = body.statements;
                 blockLocation = body;
@@ -51843,76 +63512,172 @@ var ts;
             currentNamespaceContainerName = savedCurrentNamespaceContainerName;
             currentNamespace = savedCurrentNamespace;
             currentScopeFirstDeclarationsOfName = savedCurrentScopeFirstDeclarationsOfName;
-            var block = ts.createBlock(ts.setTextRange(ts.createNodeArray(statements), statementsLocation), true);
+            var block = ts.createBlock(ts.setTextRange(ts.createNodeArray(statements), 
+            /*location*/ statementsLocation), 
+            /*multiLine*/ true);
             ts.setTextRange(block, blockLocation);
-            if (body.kind !== 240) {
-                ts.setEmitFlags(block, ts.getEmitFlags(block) | 1536);
+            // namespace hello.hi.world {
+            //      function foo() {}
+            //
+            //      // TODO, blah
+            // }
+            //
+            // should be emitted as
+            //
+            // var hello;
+            // (function (hello) {
+            //     var hi;
+            //     (function (hi) {
+            //         var world;
+            //         (function (world) {
+            //             function foo() { }
+            //             // TODO, blah
+            //         })(world = hi.world || (hi.world = {}));
+            //     })(hi = hello.hi || (hello.hi = {}));
+            // })(hello || (hello = {}));
+            // We only want to emit comment on the namespace which contains block body itself, not the containing namespaces.
+            if (body.kind !== 240 /* ModuleBlock */) {
+                ts.setEmitFlags(block, ts.getEmitFlags(block) | 1536 /* NoComments */);
             }
             return block;
         }
         function getInnerMostModuleDeclarationFromDottedModule(moduleDeclaration) {
-            if (moduleDeclaration.body.kind === 239) {
+            if (moduleDeclaration.body.kind === 239 /* ModuleDeclaration */) {
                 var recursiveInnerModule = getInnerMostModuleDeclarationFromDottedModule(moduleDeclaration.body);
                 return recursiveInnerModule || moduleDeclaration.body;
             }
         }
+        /**
+         * Visits an import declaration, eliding it if it is not referenced.
+         *
+         * @param node The import declaration node.
+         */
         function visitImportDeclaration(node) {
             if (!node.importClause) {
+                // Do not elide a side-effect only import declaration.
+                //  import "foo";
                 return node;
             }
+            // Elide the declaration if the import clause was elided.
             var importClause = ts.visitNode(node.importClause, visitImportClause, ts.isImportClause);
             return importClause
-                ? ts.updateImportDeclaration(node, undefined, undefined, importClause, node.moduleSpecifier)
+                ? ts.updateImportDeclaration(node, 
+                /*decorators*/ undefined, 
+                /*modifiers*/ undefined, importClause, node.moduleSpecifier)
                 : undefined;
         }
+        /**
+         * Visits an import clause, eliding it if it is not referenced.
+         *
+         * @param node The import clause node.
+         */
         function visitImportClause(node) {
+            // Elide the import clause if we elide both its name and its named bindings.
             var name = resolver.isReferencedAliasDeclaration(node) ? node.name : undefined;
             var namedBindings = ts.visitNode(node.namedBindings, visitNamedImportBindings, ts.isNamedImportBindings);
             return (name || namedBindings) ? ts.updateImportClause(node, name, namedBindings) : undefined;
         }
+        /**
+         * Visits named import bindings, eliding it if it is not referenced.
+         *
+         * @param node The named import bindings node.
+         */
         function visitNamedImportBindings(node) {
-            if (node.kind === 246) {
+            if (node.kind === 246 /* NamespaceImport */) {
+                // Elide a namespace import if it is not referenced.
                 return resolver.isReferencedAliasDeclaration(node) ? node : undefined;
             }
             else {
+                // Elide named imports if all of its import specifiers are elided.
                 var elements = ts.visitNodes(node.elements, visitImportSpecifier, ts.isImportSpecifier);
                 return ts.some(elements) ? ts.updateNamedImports(node, elements) : undefined;
             }
         }
+        /**
+         * Visits an import specifier, eliding it if it is not referenced.
+         *
+         * @param node The import specifier node.
+         */
         function visitImportSpecifier(node) {
+            // Elide an import specifier if it is not referenced.
             return resolver.isReferencedAliasDeclaration(node) ? node : undefined;
         }
+        /**
+         * Visits an export assignment, eliding it if it does not contain a clause that resolves
+         * to a value.
+         *
+         * @param node The export assignment node.
+         */
         function visitExportAssignment(node) {
+            // Elide the export assignment if it does not reference a value.
             return resolver.isValueAliasDeclaration(node)
                 ? ts.visitEachChild(node, visitor, context)
                 : undefined;
         }
+        /**
+         * Visits an export declaration, eliding it if it does not contain a clause that resolves
+         * to a value.
+         *
+         * @param node The export declaration node.
+         */
         function visitExportDeclaration(node) {
             if (!node.exportClause) {
+                // Elide a star export if the module it references does not export a value.
                 return compilerOptions.isolatedModules || resolver.moduleExportsSomeValue(node.moduleSpecifier) ? node : undefined;
             }
             if (!resolver.isValueAliasDeclaration(node)) {
+                // Elide the export declaration if it does not export a value.
                 return undefined;
             }
+            // Elide the export declaration if all of its named exports are elided.
             var exportClause = ts.visitNode(node.exportClause, visitNamedExports, ts.isNamedExports);
             return exportClause
-                ? ts.updateExportDeclaration(node, undefined, undefined, exportClause, node.moduleSpecifier)
+                ? ts.updateExportDeclaration(node, 
+                /*decorators*/ undefined, 
+                /*modifiers*/ undefined, exportClause, node.moduleSpecifier)
                 : undefined;
         }
+        /**
+         * Visits named exports, eliding it if it does not contain an export specifier that
+         * resolves to a value.
+         *
+         * @param node The named exports node.
+         */
         function visitNamedExports(node) {
+            // Elide the named exports if all of its export specifiers were elided.
             var elements = ts.visitNodes(node.elements, visitExportSpecifier, ts.isExportSpecifier);
             return ts.some(elements) ? ts.updateNamedExports(node, elements) : undefined;
         }
+        /**
+         * Visits an export specifier, eliding it if it does not resolve to a value.
+         *
+         * @param node The export specifier node.
+         */
         function visitExportSpecifier(node) {
+            // Elide an export specifier if it does not reference a value.
             return resolver.isValueAliasDeclaration(node) ? node : undefined;
         }
+        /**
+         * Determines whether to emit an import equals declaration.
+         *
+         * @param node The import equals declaration node.
+         */
         function shouldEmitImportEqualsDeclaration(node) {
+            // preserve old compiler's behavior: emit 'var' for import declaration (even if we do not consider them referenced) when
+            // - current file is not external module
+            // - import declaration is top level and target is value imported by entity name
             return resolver.isReferencedAliasDeclaration(node)
                 || (!ts.isExternalModule(currentSourceFile)
                     && resolver.isTopLevelValueImportEqualsWithEntityName(node));
         }
+        /**
+         * Visits an import equals declaration.
+         *
+         * @param node The import equals declaration node.
+         */
         function visitImportEqualsDeclaration(node) {
             if (ts.isExternalModuleImportEqualsDeclaration(node)) {
+                // Elide external module `import=` if it is not referenced.
                 return resolver.isReferencedAliasDeclaration(node)
                     ? ts.visitEachChild(node, visitor, context)
                     : undefined;
@@ -51921,59 +63686,98 @@ var ts;
                 return undefined;
             }
             var moduleReference = ts.createExpressionFromEntityName(node.moduleReference);
-            ts.setEmitFlags(moduleReference, 1536 | 2048);
+            ts.setEmitFlags(moduleReference, 1536 /* NoComments */ | 2048 /* NoNestedComments */);
             if (isNamedExternalModuleExport(node) || !isExportOfNamespace(node)) {
+                //  export var ${name} = ${moduleReference};
+                //  var ${name} = ${moduleReference};
                 return ts.setOriginalNode(ts.setTextRange(ts.createVariableStatement(ts.visitNodes(node.modifiers, modifierVisitor, ts.isModifier), ts.createVariableDeclarationList([
-                    ts.setOriginalNode(ts.createVariableDeclaration(node.name, undefined, moduleReference), node)
+                    ts.setOriginalNode(ts.createVariableDeclaration(node.name, 
+                    /*type*/ undefined, moduleReference), node)
                 ])), node), node);
             }
             else {
+                // exports.${name} = ${moduleReference};
                 return ts.setOriginalNode(createNamespaceExport(node.name, moduleReference, node), node);
             }
         }
+        /**
+         * Gets a value indicating whether the node is exported from a namespace.
+         *
+         * @param node The node to test.
+         */
         function isExportOfNamespace(node) {
-            return currentNamespace !== undefined && ts.hasModifier(node, 1);
+            return currentNamespace !== undefined && ts.hasModifier(node, 1 /* Export */);
         }
+        /**
+         * Gets a value indicating whether the node is exported from an external module.
+         *
+         * @param node The node to test.
+         */
         function isExternalModuleExport(node) {
-            return currentNamespace === undefined && ts.hasModifier(node, 1);
+            return currentNamespace === undefined && ts.hasModifier(node, 1 /* Export */);
         }
+        /**
+         * Gets a value indicating whether the node is a named export from an external module.
+         *
+         * @param node The node to test.
+         */
         function isNamedExternalModuleExport(node) {
             return isExternalModuleExport(node)
-                && !ts.hasModifier(node, 512);
+                && !ts.hasModifier(node, 512 /* Default */);
         }
+        /**
+         * Gets a value indicating whether the node is the default export of an external module.
+         *
+         * @param node The node to test.
+         */
         function isDefaultExternalModuleExport(node) {
             return isExternalModuleExport(node)
-                && ts.hasModifier(node, 512);
+                && ts.hasModifier(node, 512 /* Default */);
         }
+        /**
+         * Creates a statement for the provided expression. This is used in calls to `map`.
+         */
         function expressionToStatement(expression) {
             return ts.createStatement(expression);
         }
         function addExportMemberAssignment(statements, node) {
-            var expression = ts.createAssignment(ts.getExternalModuleOrNamespaceExportName(currentNamespaceContainerName, node, false, true), ts.getLocalName(node));
+            var expression = ts.createAssignment(ts.getExternalModuleOrNamespaceExportName(currentNamespaceContainerName, node, /*allowComments*/ false, /*allowSourceMaps*/ true), ts.getLocalName(node));
             ts.setSourceMapRange(expression, ts.createRange(node.name ? node.name.pos : node.pos, node.end));
             var statement = ts.createStatement(expression);
             ts.setSourceMapRange(statement, ts.createRange(-1, node.end));
             statements.push(statement);
         }
         function createNamespaceExport(exportName, exportValue, location) {
-            return ts.setTextRange(ts.createStatement(ts.createAssignment(ts.getNamespaceMemberName(currentNamespaceContainerName, exportName, false, true), exportValue)), location);
+            return ts.setTextRange(ts.createStatement(ts.createAssignment(ts.getNamespaceMemberName(currentNamespaceContainerName, exportName, /*allowComments*/ false, /*allowSourceMaps*/ true), exportValue)), location);
         }
         function createNamespaceExportExpression(exportName, exportValue, location) {
             return ts.setTextRange(ts.createAssignment(getNamespaceMemberNameWithSourceMapsAndWithoutComments(exportName), exportValue), location);
         }
         function getNamespaceMemberNameWithSourceMapsAndWithoutComments(name) {
-            return ts.getNamespaceMemberName(currentNamespaceContainerName, name, false, true);
+            return ts.getNamespaceMemberName(currentNamespaceContainerName, name, /*allowComments*/ false, /*allowSourceMaps*/ true);
         }
+        /**
+         * Gets the declaration name used inside of a namespace or enum.
+         */
         function getNamespaceParameterName(node) {
             var name = ts.getGeneratedNameForNode(node);
             ts.setSourceMapRange(name, node.name);
             return name;
         }
+        /**
+         * Gets the expression used to refer to a namespace or enum within the body
+         * of its declaration.
+         */
         function getNamespaceContainerName(node) {
             return ts.getGeneratedNameForNode(node);
         }
+        /**
+         * Gets a local alias for a class declaration if it is a decorated class with an internal
+         * reference to the static side of the class. This is necessary to avoid issues with
+         * double-binding semantics for the class name.
+         */
         function getClassAliasIfNeeded(node) {
-            if (resolver.getNodeCheckFlags(node) & 8388608) {
+            if (resolver.getNodeCheckFlags(node) & 8388608 /* ClassWithConstructorReference */) {
                 enableSubstitutionForClassAliases();
                 var classAlias = ts.createUniqueName(node.name && !ts.isGeneratedIdentifier(node.name) ? ts.idText(node.name) : "default");
                 classAliases[ts.getOriginalNodeId(node)] = classAlias;
@@ -51985,56 +63789,75 @@ var ts;
             return ts.createPropertyAccess(ts.getDeclarationName(node), "prototype");
         }
         function getClassMemberPrefix(node, member) {
-            return ts.hasModifier(member, 32)
+            return ts.hasModifier(member, 32 /* Static */)
                 ? ts.getDeclarationName(node)
                 : getClassPrototype(node);
         }
         function enableSubstitutionForNonQualifiedEnumMembers() {
-            if ((enabledSubstitutions & 8) === 0) {
-                enabledSubstitutions |= 8;
-                context.enableSubstitution(71);
+            if ((enabledSubstitutions & 8 /* NonQualifiedEnumMembers */) === 0) {
+                enabledSubstitutions |= 8 /* NonQualifiedEnumMembers */;
+                context.enableSubstitution(71 /* Identifier */);
             }
         }
         function enableSubstitutionForClassAliases() {
-            if ((enabledSubstitutions & 1) === 0) {
-                enabledSubstitutions |= 1;
-                context.enableSubstitution(71);
+            if ((enabledSubstitutions & 1 /* ClassAliases */) === 0) {
+                enabledSubstitutions |= 1 /* ClassAliases */;
+                // We need to enable substitutions for identifiers. This allows us to
+                // substitute class names inside of a class declaration.
+                context.enableSubstitution(71 /* Identifier */);
+                // Keep track of class aliases.
                 classAliases = [];
             }
         }
         function enableSubstitutionForNamespaceExports() {
-            if ((enabledSubstitutions & 2) === 0) {
-                enabledSubstitutions |= 2;
-                context.enableSubstitution(71);
-                context.enableSubstitution(271);
-                context.enableEmitNotification(239);
+            if ((enabledSubstitutions & 2 /* NamespaceExports */) === 0) {
+                enabledSubstitutions |= 2 /* NamespaceExports */;
+                // We need to enable substitutions for identifiers and shorthand property assignments. This allows us to
+                // substitute the names of exported members of a namespace.
+                context.enableSubstitution(71 /* Identifier */);
+                context.enableSubstitution(271 /* ShorthandPropertyAssignment */);
+                // We need to be notified when entering and exiting namespaces.
+                context.enableEmitNotification(239 /* ModuleDeclaration */);
             }
         }
         function isTransformedModuleDeclaration(node) {
-            return ts.getOriginalNode(node).kind === 239;
+            return ts.getOriginalNode(node).kind === 239 /* ModuleDeclaration */;
         }
         function isTransformedEnumDeclaration(node) {
-            return ts.getOriginalNode(node).kind === 238;
+            return ts.getOriginalNode(node).kind === 238 /* EnumDeclaration */;
         }
+        /**
+         * Hook for node emit.
+         *
+         * @param hint A hint as to the intended usage of the node.
+         * @param node The node to emit.
+         * @param emit A callback used to emit the node in the printer.
+         */
         function onEmitNode(hint, node, emitCallback) {
             var savedApplicableSubstitutions = applicableSubstitutions;
             var savedCurrentSourceFile = currentSourceFile;
             if (ts.isSourceFile(node)) {
                 currentSourceFile = node;
             }
-            if (enabledSubstitutions & 2 && isTransformedModuleDeclaration(node)) {
-                applicableSubstitutions |= 2;
+            if (enabledSubstitutions & 2 /* NamespaceExports */ && isTransformedModuleDeclaration(node)) {
+                applicableSubstitutions |= 2 /* NamespaceExports */;
             }
-            if (enabledSubstitutions & 8 && isTransformedEnumDeclaration(node)) {
-                applicableSubstitutions |= 8;
+            if (enabledSubstitutions & 8 /* NonQualifiedEnumMembers */ && isTransformedEnumDeclaration(node)) {
+                applicableSubstitutions |= 8 /* NonQualifiedEnumMembers */;
             }
             previousOnEmitNode(hint, node, emitCallback);
             applicableSubstitutions = savedApplicableSubstitutions;
             currentSourceFile = savedCurrentSourceFile;
         }
+        /**
+         * Hooks node substitutions.
+         *
+         * @param hint A hint as to the intended usage of the node.
+         * @param node The node to substitute.
+         */
         function onSubstituteNode(hint, node) {
             node = previousOnSubstituteNode(hint, node);
-            if (hint === 1) {
+            if (hint === 1 /* Expression */) {
                 return substituteExpression(node);
             }
             else if (ts.isShorthandPropertyAssignment(node)) {
@@ -52043,10 +63866,12 @@ var ts;
             return node;
         }
         function substituteShorthandPropertyAssignment(node) {
-            if (enabledSubstitutions & 2) {
+            if (enabledSubstitutions & 2 /* NamespaceExports */) {
                 var name = node.name;
                 var exportedName = trySubstituteNamespaceExportedName(name);
                 if (exportedName) {
+                    // A shorthand property with an assignment initializer is probably part of a
+                    // destructuring assignment
                     if (node.objectAssignmentInitializer) {
                         var initializer = ts.createAssignment(exportedName, node.objectAssignmentInitializer);
                         return ts.setTextRange(ts.createPropertyAssignment(name, initializer), node);
@@ -52058,11 +63883,11 @@ var ts;
         }
         function substituteExpression(node) {
             switch (node.kind) {
-                case 71:
+                case 71 /* Identifier */:
                     return substituteExpressionIdentifier(node);
-                case 185:
+                case 185 /* PropertyAccessExpression */:
                     return substitutePropertyAccessExpression(node);
-                case 186:
+                case 186 /* ElementAccessExpression */:
                     return substituteElementAccessExpression(node);
             }
             return node;
@@ -52073,11 +63898,16 @@ var ts;
                 || node;
         }
         function trySubstituteClassAlias(node) {
-            if (enabledSubstitutions & 1) {
-                if (resolver.getNodeCheckFlags(node) & 16777216) {
+            if (enabledSubstitutions & 1 /* ClassAliases */) {
+                if (resolver.getNodeCheckFlags(node) & 16777216 /* ConstructorReferenceInClass */) {
+                    // Due to the emit for class decorators, any reference to the class from inside of the class body
+                    // must instead be rewritten to point to a temporary variable to avoid issues with the double-bind
+                    // behavior of class names in ES6.
+                    // Also, when emitting statics for class expressions, we must substitute a class alias for
+                    // constructor references in static property initializers.
                     var declaration = resolver.getReferencedValueDeclaration(node);
                     if (declaration) {
-                        var classAlias = classAliases[declaration.id];
+                        var classAlias = classAliases[declaration.id]; // TODO: GH#18217
                         if (classAlias) {
                             var clone_1 = ts.getSynthesizedClone(classAlias);
                             ts.setSourceMapRange(clone_1, node);
@@ -52090,13 +63920,17 @@ var ts;
             return undefined;
         }
         function trySubstituteNamespaceExportedName(node) {
+            // If this is explicitly a local name, do not substitute.
             if (enabledSubstitutions & applicableSubstitutions && !ts.isGeneratedIdentifier(node) && !ts.isLocalName(node)) {
-                var container = resolver.getReferencedExportContainer(node, false);
-                if (container && container.kind !== 274) {
-                    var substitute = (applicableSubstitutions & 2 && container.kind === 239) ||
-                        (applicableSubstitutions & 8 && container.kind === 238);
+                // If we are nested within a namespace declaration, we may need to qualifiy
+                // an identifier that is exported from a merged namespace.
+                var container = resolver.getReferencedExportContainer(node, /*prefixLocals*/ false);
+                if (container && container.kind !== 274 /* SourceFile */) {
+                    var substitute = (applicableSubstitutions & 2 /* NamespaceExports */ && container.kind === 239 /* ModuleDeclaration */) ||
+                        (applicableSubstitutions & 8 /* NonQualifiedEnumMembers */ && container.kind === 238 /* EnumDeclaration */);
                     if (substitute) {
-                        return ts.setTextRange(ts.createPropertyAccess(ts.getGeneratedNameForNode(container), node), node);
+                        return ts.setTextRange(ts.createPropertyAccess(ts.getGeneratedNameForNode(container), node), 
+                        /*location*/ node);
                     }
                 }
             }
@@ -52111,13 +63945,14 @@ var ts;
         function substituteConstantValue(node) {
             var constantValue = tryGetConstEnumValue(node);
             if (constantValue !== undefined) {
+                // track the constant value on the node for the printer in needsDotDotForPropertyAccess
                 ts.setConstantValue(node, constantValue);
                 var substitute = ts.createLiteral(constantValue);
                 if (!compilerOptions.removeComments) {
                     var propertyName = ts.isPropertyAccessExpression(node)
                         ? ts.declarationNameToString(node.name)
                         : ts.getTextOfNode(node.argumentExpression);
-                    ts.addSyntheticTrailingComment(substitute, 3, " " + propertyName + " ");
+                    ts.addSyntheticTrailingComment(substitute, 3 /* MultiLineCommentTrivia */, " " + propertyName + " ");
                 }
                 return substitute;
             }
@@ -52133,7 +63968,7 @@ var ts;
     ts.transformTypeScript = transformTypeScript;
     function createDecorateHelper(context, decoratorExpressions, target, memberName, descriptor, location) {
         var argumentsArray = [];
-        argumentsArray.push(ts.createArrayLiteral(decoratorExpressions, true));
+        argumentsArray.push(ts.createArrayLiteral(decoratorExpressions, /*multiLine*/ true));
         argumentsArray.push(target);
         if (memberName) {
             argumentsArray.push(memberName);
@@ -52142,7 +63977,8 @@ var ts;
             }
         }
         context.requestEmitHelper(decorateHelper);
-        return ts.setTextRange(ts.createCall(ts.getHelperName("__decorate"), undefined, argumentsArray), location);
+        return ts.setTextRange(ts.createCall(ts.getHelperName("__decorate"), 
+        /*typeArguments*/ undefined, argumentsArray), location);
     }
     var decorateHelper = {
         name: "typescript:decorate",
@@ -52152,7 +63988,8 @@ var ts;
     };
     function createMetadataHelper(context, metadataKey, metadataValue) {
         context.requestEmitHelper(metadataHelper);
-        return ts.createCall(ts.getHelperName("__metadata"), undefined, [
+        return ts.createCall(ts.getHelperName("__metadata"), 
+        /*typeArguments*/ undefined, [
             ts.createLiteral(metadataKey),
             metadataValue
         ]);
@@ -52165,7 +64002,8 @@ var ts;
     };
     function createParamHelper(context, expression, parameterOffset, location) {
         context.requestEmitHelper(paramHelper);
-        return ts.setTextRange(ts.createCall(ts.getHelperName("__param"), undefined, [
+        return ts.setTextRange(ts.createCall(ts.getHelperName("__param"), 
+        /*typeArguments*/ undefined, [
             ts.createLiteral(parameterOffset),
             expression
         ]), location);
@@ -52177,10 +64015,12 @@ var ts;
         text: "\n            var __param = (this && this.__param) || function (paramIndex, decorator) {\n                return function (target, key) { decorator(target, key, paramIndex); }\n            };"
     };
 })(ts || (ts = {}));
+/*@internal*/
 var ts;
 (function (ts) {
     var ES2017SubstitutionFlags;
     (function (ES2017SubstitutionFlags) {
+        /** Enables substitutions for async methods with `super` calls. */
         ES2017SubstitutionFlags[ES2017SubstitutionFlags["AsyncMethodsWithSuper"] = 1] = "AsyncMethodsWithSuper";
     })(ES2017SubstitutionFlags || (ES2017SubstitutionFlags = {}));
     function transformES2017(context) {
@@ -52188,11 +64028,21 @@ var ts;
         var resolver = context.getEmitResolver();
         var compilerOptions = context.getCompilerOptions();
         var languageVersion = ts.getEmitScriptTarget(compilerOptions);
+        /**
+         * Keeps track of whether expression substitution has been enabled for specific edge cases.
+         * They are persisted between each SourceFile transformation and should not be reset.
+         */
         var enabledSubstitutions;
+        /**
+         * This keeps track of containers where `super` is valid, for use with
+         * just-in-time substitution for `super` expressions inside of async methods.
+         */
         var enclosingSuperContainerFlags = 0;
         var enclosingFunctionParameterNames;
+        // Save the previous transformation hooks.
         var previousOnEmitNode = context.onEmitNode;
         var previousOnSubstituteNode = context.onSubstituteNode;
+        // Set new transformation hooks.
         context.onEmitNode = onEmitNode;
         context.onSubstituteNode = onSubstituteNode;
         return ts.chainBundle(transformSourceFile);
@@ -52205,21 +64055,22 @@ var ts;
             return visited;
         }
         function visitor(node) {
-            if ((node.transformFlags & 16) === 0) {
+            if ((node.transformFlags & 16 /* ContainsES2017 */) === 0) {
                 return node;
             }
             switch (node.kind) {
-                case 120:
+                case 120 /* AsyncKeyword */:
+                    // ES2017 async modifier should be elided for targets < ES2017
                     return undefined;
-                case 197:
+                case 197 /* AwaitExpression */:
                     return visitAwaitExpression(node);
-                case 154:
+                case 154 /* MethodDeclaration */:
                     return visitMethodDeclaration(node);
-                case 234:
+                case 234 /* FunctionDeclaration */:
                     return visitFunctionDeclaration(node);
-                case 192:
+                case 192 /* FunctionExpression */:
                     return visitFunctionExpression(node);
-                case 193:
+                case 193 /* ArrowFunction */:
                     return visitArrowFunction(node);
                 default:
                     return ts.visitEachChild(node, visitor, context);
@@ -52228,27 +64079,27 @@ var ts;
         function asyncBodyVisitor(node) {
             if (ts.isNodeWithPossibleHoistedDeclaration(node)) {
                 switch (node.kind) {
-                    case 214:
+                    case 214 /* VariableStatement */:
                         return visitVariableStatementInAsyncBody(node);
-                    case 220:
+                    case 220 /* ForStatement */:
                         return visitForStatementInAsyncBody(node);
-                    case 221:
+                    case 221 /* ForInStatement */:
                         return visitForInStatementInAsyncBody(node);
-                    case 222:
+                    case 222 /* ForOfStatement */:
                         return visitForOfStatementInAsyncBody(node);
-                    case 269:
+                    case 269 /* CatchClause */:
                         return visitCatchClauseInAsyncBody(node);
-                    case 213:
-                    case 227:
-                    case 241:
-                    case 266:
-                    case 267:
-                    case 230:
-                    case 218:
-                    case 219:
-                    case 217:
-                    case 226:
-                    case 228:
+                    case 213 /* Block */:
+                    case 227 /* SwitchStatement */:
+                    case 241 /* CaseBlock */:
+                    case 266 /* CaseClause */:
+                    case 267 /* DefaultClause */:
+                    case 230 /* TryStatement */:
+                    case 218 /* DoStatement */:
+                    case 219 /* WhileStatement */:
+                    case 217 /* IfStatement */:
+                    case 226 /* WithStatement */:
+                    case 228 /* LabeledStatement */:
                         return ts.visitEachChild(node, asyncBodyVisitor, context);
                     default:
                         return ts.Debug.assertNever(node, "Unhandled node.");
@@ -52258,7 +64109,8 @@ var ts;
         }
         function visitCatchClauseInAsyncBody(node) {
             var catchClauseNames = ts.createUnderscoreEscapedMap();
-            recordDeclarationName(node.variableDeclaration, catchClauseNames);
+            recordDeclarationName(node.variableDeclaration, catchClauseNames); // TODO: GH#18217
+            // names declared in a catch variable are block scoped
             var catchClauseUnshadowedNames;
             catchClauseNames.forEach(function (_, escapedName) {
                 if (enclosingFunctionParameterNames.has(escapedName)) {
@@ -52281,47 +64133,98 @@ var ts;
         }
         function visitVariableStatementInAsyncBody(node) {
             if (isVariableDeclarationListWithCollidingName(node.declarationList)) {
-                var expression = visitVariableDeclarationListWithCollidingNames(node.declarationList, false);
+                var expression = visitVariableDeclarationListWithCollidingNames(node.declarationList, /*hasReceiver*/ false);
                 return expression ? ts.createStatement(expression) : undefined;
             }
             return ts.visitEachChild(node, visitor, context);
         }
         function visitForInStatementInAsyncBody(node) {
             return ts.updateForIn(node, isVariableDeclarationListWithCollidingName(node.initializer)
-                ? visitVariableDeclarationListWithCollidingNames(node.initializer, true)
+                ? visitVariableDeclarationListWithCollidingNames(node.initializer, /*hasReceiver*/ true)
                 : ts.visitNode(node.initializer, visitor, ts.isForInitializer), ts.visitNode(node.expression, visitor, ts.isExpression), ts.visitNode(node.statement, asyncBodyVisitor, ts.isStatement, ts.liftToBlock));
         }
         function visitForOfStatementInAsyncBody(node) {
             return ts.updateForOf(node, ts.visitNode(node.awaitModifier, visitor, ts.isToken), isVariableDeclarationListWithCollidingName(node.initializer)
-                ? visitVariableDeclarationListWithCollidingNames(node.initializer, true)
+                ? visitVariableDeclarationListWithCollidingNames(node.initializer, /*hasReceiver*/ true)
                 : ts.visitNode(node.initializer, visitor, ts.isForInitializer), ts.visitNode(node.expression, visitor, ts.isExpression), ts.visitNode(node.statement, asyncBodyVisitor, ts.isStatement, ts.liftToBlock));
         }
         function visitForStatementInAsyncBody(node) {
-            var initializer = node.initializer;
+            var initializer = node.initializer; // TODO: GH#18217
             return ts.updateFor(node, isVariableDeclarationListWithCollidingName(initializer)
-                ? visitVariableDeclarationListWithCollidingNames(initializer, false)
+                ? visitVariableDeclarationListWithCollidingNames(initializer, /*hasReceiver*/ false)
                 : ts.visitNode(node.initializer, visitor, ts.isForInitializer), ts.visitNode(node.condition, visitor, ts.isExpression), ts.visitNode(node.incrementor, visitor, ts.isExpression), ts.visitNode(node.statement, asyncBodyVisitor, ts.isStatement, ts.liftToBlock));
         }
+        /**
+         * Visits an AwaitExpression node.
+         *
+         * This function will be called any time a ES2017 await expression is encountered.
+         *
+         * @param node The node to visit.
+         */
         function visitAwaitExpression(node) {
-            return ts.setOriginalNode(ts.setTextRange(ts.createYield(undefined, ts.visitNode(node.expression, visitor, ts.isExpression)), node), node);
+            return ts.setOriginalNode(ts.setTextRange(ts.createYield(
+            /*asteriskToken*/ undefined, ts.visitNode(node.expression, visitor, ts.isExpression)), node), node);
         }
+        /**
+         * Visits a MethodDeclaration node.
+         *
+         * This function will be called when one of the following conditions are met:
+         * - The node is marked as async
+         *
+         * @param node The node to visit.
+         */
         function visitMethodDeclaration(node) {
-            return ts.updateMethod(node, undefined, ts.visitNodes(node.modifiers, visitor, ts.isModifier), node.asteriskToken, node.name, undefined, undefined, ts.visitParameterList(node.parameters, visitor, context), undefined, ts.getFunctionFlags(node) & 2
+            return ts.updateMethod(node, 
+            /*decorators*/ undefined, ts.visitNodes(node.modifiers, visitor, ts.isModifier), node.asteriskToken, node.name, 
+            /*questionToken*/ undefined, 
+            /*typeParameters*/ undefined, ts.visitParameterList(node.parameters, visitor, context), 
+            /*type*/ undefined, ts.getFunctionFlags(node) & 2 /* Async */
                 ? transformAsyncFunctionBody(node)
                 : ts.visitFunctionBody(node.body, visitor, context));
         }
+        /**
+         * Visits a FunctionDeclaration node.
+         *
+         * This function will be called when one of the following conditions are met:
+         * - The node is marked async
+         *
+         * @param node The node to visit.
+         */
         function visitFunctionDeclaration(node) {
-            return ts.updateFunctionDeclaration(node, undefined, ts.visitNodes(node.modifiers, visitor, ts.isModifier), node.asteriskToken, node.name, undefined, ts.visitParameterList(node.parameters, visitor, context), undefined, ts.getFunctionFlags(node) & 2
+            return ts.updateFunctionDeclaration(node, 
+            /*decorators*/ undefined, ts.visitNodes(node.modifiers, visitor, ts.isModifier), node.asteriskToken, node.name, 
+            /*typeParameters*/ undefined, ts.visitParameterList(node.parameters, visitor, context), 
+            /*type*/ undefined, ts.getFunctionFlags(node) & 2 /* Async */
                 ? transformAsyncFunctionBody(node)
                 : ts.visitFunctionBody(node.body, visitor, context));
         }
+        /**
+         * Visits a FunctionExpression node.
+         *
+         * This function will be called when one of the following conditions are met:
+         * - The node is marked async
+         *
+         * @param node The node to visit.
+         */
         function visitFunctionExpression(node) {
-            return ts.updateFunctionExpression(node, ts.visitNodes(node.modifiers, visitor, ts.isModifier), node.asteriskToken, node.name, undefined, ts.visitParameterList(node.parameters, visitor, context), undefined, ts.getFunctionFlags(node) & 2
+            return ts.updateFunctionExpression(node, ts.visitNodes(node.modifiers, visitor, ts.isModifier), node.asteriskToken, node.name, 
+            /*typeParameters*/ undefined, ts.visitParameterList(node.parameters, visitor, context), 
+            /*type*/ undefined, ts.getFunctionFlags(node) & 2 /* Async */
                 ? transformAsyncFunctionBody(node)
                 : ts.visitFunctionBody(node.body, visitor, context));
         }
+        /**
+         * Visits an ArrowFunction.
+         *
+         * This function will be called when one of the following conditions are met:
+         * - The node is marked async
+         *
+         * @param node The node to visit.
+         */
         function visitArrowFunction(node) {
-            return ts.updateArrowFunction(node, ts.visitNodes(node.modifiers, visitor, ts.isModifier), undefined, ts.visitParameterList(node.parameters, visitor, context), undefined, node.equalsGreaterThanToken, ts.getFunctionFlags(node) & 2
+            return ts.updateArrowFunction(node, ts.visitNodes(node.modifiers, visitor, ts.isModifier), 
+            /*typeParameters*/ undefined, ts.visitParameterList(node.parameters, visitor, context), 
+            /*type*/ undefined, node.equalsGreaterThanToken, ts.getFunctionFlags(node) & 2 /* Async */
                 ? transformAsyncFunctionBody(node)
                 : ts.visitFunctionBody(node.body, visitor, context));
         }
@@ -52342,7 +64245,7 @@ var ts;
         function isVariableDeclarationListWithCollidingName(node) {
             return !!node
                 && ts.isVariableDeclarationList(node)
-                && !(node.flags & 3)
+                && !(node.flags & 3 /* BlockScoped */)
                 && node.declarations.some(collidesWithParameterName);
         }
         function visitVariableDeclarationListWithCollidingNames(node, hasReceiver) {
@@ -52396,9 +64299,14 @@ var ts;
             resumeLexicalEnvironment();
             var original = ts.getOriginalNode(node, ts.isFunctionLike);
             var nodeType = original.type;
-            var promiseConstructor = languageVersion < 2 ? getPromiseConstructor(nodeType) : undefined;
-            var isArrowFunction = node.kind === 193;
-            var hasLexicalArguments = (resolver.getNodeCheckFlags(node) & 8192) !== 0;
+            var promiseConstructor = languageVersion < 2 /* ES2015 */ ? getPromiseConstructor(nodeType) : undefined;
+            var isArrowFunction = node.kind === 193 /* ArrowFunction */;
+            var hasLexicalArguments = (resolver.getNodeCheckFlags(node) & 8192 /* CaptureArguments */) !== 0;
+            // An async function is emit as an outer function that calls an inner
+            // generator function. To preserve lexical bindings, we pass the current
+            // `this` and `arguments` objects to `__awaiter`. The generator function
+            // passed to `__awaiter` is executed inside of the callback to the
+            // promise constructor.
             var savedEnclosingFunctionParameterNames = enclosingFunctionParameterNames;
             enclosingFunctionParameterNames = ts.createUnderscoreEscapedMap();
             for (var _i = 0, _a = node.parameters; _i < _a.length; _i++) {
@@ -52408,17 +64316,19 @@ var ts;
             var result;
             if (!isArrowFunction) {
                 var statements = [];
-                var statementOffset = ts.addPrologue(statements, node.body.statements, false, visitor);
+                var statementOffset = ts.addPrologue(statements, node.body.statements, /*ensureUseStrict*/ false, visitor);
                 statements.push(ts.createReturn(createAwaiterHelper(context, hasLexicalArguments, promiseConstructor, transformAsyncFunctionBodyWorker(node.body, statementOffset))));
                 ts.prependStatements(statements, endLexicalEnvironment());
-                var block = ts.createBlock(statements, true);
+                var block = ts.createBlock(statements, /*multiLine*/ true);
                 ts.setTextRange(block, node.body);
-                if (languageVersion >= 2) {
-                    if (resolver.getNodeCheckFlags(node) & 4096) {
+                // Minor optimization, emit `_super` helper to capture `super` access in an arrow.
+                // This step isn't needed if we eventually transform this to ES5.
+                if (languageVersion >= 2 /* ES2015 */) {
+                    if (resolver.getNodeCheckFlags(node) & 4096 /* AsyncMethodWithSuperBinding */) {
                         enableSubstitutionForAsyncMethodsWithSuper();
                         ts.addEmitHelper(block, ts.advancedAsyncSuperHelper);
                     }
-                    else if (resolver.getNodeCheckFlags(node) & 2048) {
+                    else if (resolver.getNodeCheckFlags(node) & 2048 /* AsyncMethodWithSuper */) {
                         enableSubstitutionForAsyncMethodsWithSuper();
                         ts.addEmitHelper(block, ts.asyncSuperHelper);
                     }
@@ -52459,21 +64369,33 @@ var ts;
             return undefined;
         }
         function enableSubstitutionForAsyncMethodsWithSuper() {
-            if ((enabledSubstitutions & 1) === 0) {
-                enabledSubstitutions |= 1;
-                context.enableSubstitution(187);
-                context.enableSubstitution(185);
-                context.enableSubstitution(186);
-                context.enableEmitNotification(235);
-                context.enableEmitNotification(154);
-                context.enableEmitNotification(156);
-                context.enableEmitNotification(157);
-                context.enableEmitNotification(155);
+            if ((enabledSubstitutions & 1 /* AsyncMethodsWithSuper */) === 0) {
+                enabledSubstitutions |= 1 /* AsyncMethodsWithSuper */;
+                // We need to enable substitutions for call, property access, and element access
+                // if we need to rewrite super calls.
+                context.enableSubstitution(187 /* CallExpression */);
+                context.enableSubstitution(185 /* PropertyAccessExpression */);
+                context.enableSubstitution(186 /* ElementAccessExpression */);
+                // We need to be notified when entering and exiting declarations that bind super.
+                context.enableEmitNotification(235 /* ClassDeclaration */);
+                context.enableEmitNotification(154 /* MethodDeclaration */);
+                context.enableEmitNotification(156 /* GetAccessor */);
+                context.enableEmitNotification(157 /* SetAccessor */);
+                context.enableEmitNotification(155 /* Constructor */);
             }
         }
+        /**
+         * Hook for node emit.
+         *
+         * @param hint A hint as to the intended usage of the node.
+         * @param node The node to emit.
+         * @param emit A callback used to emit the node in the printer.
+         */
         function onEmitNode(hint, node, emitCallback) {
-            if (enabledSubstitutions & 1 && isSuperContainer(node)) {
-                var superContainerFlags = resolver.getNodeCheckFlags(node) & (2048 | 4096);
+            // If we need to support substitutions for `super` in an async method,
+            // we should track it here.
+            if (enabledSubstitutions & 1 /* AsyncMethodsWithSuper */ && isSuperContainer(node)) {
+                var superContainerFlags = resolver.getNodeCheckFlags(node) & (2048 /* AsyncMethodWithSuper */ | 4096 /* AsyncMethodWithSuperBinding */);
                 if (superContainerFlags !== enclosingSuperContainerFlags) {
                     var savedEnclosingSuperContainerFlags = enclosingSuperContainerFlags;
                     enclosingSuperContainerFlags = superContainerFlags;
@@ -52484,32 +64406,38 @@ var ts;
             }
             previousOnEmitNode(hint, node, emitCallback);
         }
+        /**
+         * Hooks node substitutions.
+         *
+         * @param hint A hint as to the intended usage of the node.
+         * @param node The node to substitute.
+         */
         function onSubstituteNode(hint, node) {
             node = previousOnSubstituteNode(hint, node);
-            if (hint === 1 && enclosingSuperContainerFlags) {
+            if (hint === 1 /* Expression */ && enclosingSuperContainerFlags) {
                 return substituteExpression(node);
             }
             return node;
         }
         function substituteExpression(node) {
             switch (node.kind) {
-                case 185:
+                case 185 /* PropertyAccessExpression */:
                     return substitutePropertyAccessExpression(node);
-                case 186:
+                case 186 /* ElementAccessExpression */:
                     return substituteElementAccessExpression(node);
-                case 187:
+                case 187 /* CallExpression */:
                     return substituteCallExpression(node);
             }
             return node;
         }
         function substitutePropertyAccessExpression(node) {
-            if (node.expression.kind === 97) {
+            if (node.expression.kind === 97 /* SuperKeyword */) {
                 return createSuperAccessInAsyncMethod(ts.createLiteral(ts.idText(node.name)), node);
             }
             return node;
         }
         function substituteElementAccessExpression(node) {
-            if (node.expression.kind === 97) {
+            if (node.expression.kind === 97 /* SuperKeyword */) {
                 return createSuperAccessInAsyncMethod(node.argumentExpression, node);
             }
             return node;
@@ -52520,7 +64448,8 @@ var ts;
                 var argumentExpression = ts.isPropertyAccessExpression(expression)
                     ? substitutePropertyAccessExpression(expression)
                     : substituteElementAccessExpression(expression);
-                return ts.createCall(ts.createPropertyAccess(argumentExpression, "call"), undefined, [
+                return ts.createCall(ts.createPropertyAccess(argumentExpression, "call"), 
+                /*typeArguments*/ undefined, [
                     ts.createThis()
                 ].concat(node.arguments));
             }
@@ -52528,18 +64457,20 @@ var ts;
         }
         function isSuperContainer(node) {
             var kind = node.kind;
-            return kind === 235
-                || kind === 155
-                || kind === 154
-                || kind === 156
-                || kind === 157;
+            return kind === 235 /* ClassDeclaration */
+                || kind === 155 /* Constructor */
+                || kind === 154 /* MethodDeclaration */
+                || kind === 156 /* GetAccessor */
+                || kind === 157 /* SetAccessor */;
         }
         function createSuperAccessInAsyncMethod(argumentExpression, location) {
-            if (enclosingSuperContainerFlags & 4096) {
-                return ts.setTextRange(ts.createPropertyAccess(ts.createCall(ts.createFileLevelUniqueName("_super"), undefined, [argumentExpression]), "value"), location);
+            if (enclosingSuperContainerFlags & 4096 /* AsyncMethodWithSuperBinding */) {
+                return ts.setTextRange(ts.createPropertyAccess(ts.createCall(ts.createFileLevelUniqueName("_super"), 
+                /*typeArguments*/ undefined, [argumentExpression]), "value"), location);
             }
             else {
-                return ts.setTextRange(ts.createCall(ts.createFileLevelUniqueName("_super"), undefined, [argumentExpression]), location);
+                return ts.setTextRange(ts.createCall(ts.createFileLevelUniqueName("_super"), 
+                /*typeArguments*/ undefined, [argumentExpression]), location);
             }
         }
     }
@@ -52552,9 +64483,16 @@ var ts;
     };
     function createAwaiterHelper(context, hasLexicalArguments, promiseConstructor, body) {
         context.requestEmitHelper(awaiterHelper);
-        var generatorFunc = ts.createFunctionExpression(undefined, ts.createToken(39), undefined, undefined, [], undefined, body);
-        (generatorFunc.emitNode || (generatorFunc.emitNode = {})).flags |= 262144 | 524288;
-        return ts.createCall(ts.getHelperName("__awaiter"), undefined, [
+        var generatorFunc = ts.createFunctionExpression(
+        /*modifiers*/ undefined, ts.createToken(39 /* AsteriskToken */), 
+        /*name*/ undefined, 
+        /*typeParameters*/ undefined, 
+        /*parameters*/ [], 
+        /*type*/ undefined, body);
+        // Mark this node as originally an async function
+        (generatorFunc.emitNode || (generatorFunc.emitNode = {})).flags |= 262144 /* AsyncFunctionBody */ | 524288 /* ReuseTempVariableScope */;
+        return ts.createCall(ts.getHelperName("__awaiter"), 
+        /*typeArguments*/ undefined, [
             ts.createThis(),
             hasLexicalArguments ? ts.createIdentifier("arguments") : ts.createVoidZero(),
             promiseConstructor ? ts.createExpressionFromEntityName(promiseConstructor) : ts.createVoidZero(),
@@ -52572,10 +64510,12 @@ var ts;
         text: ts.helperString(__makeTemplateObject(["\n            const ", " = (function (geti, seti) {\n                const cache = Object.create(null);\n                return name => cache[name] || (cache[name] = { get value() { return geti(name); }, set value(v) { seti(name, v); } });\n            })(name => super[name], (name, value) => super[name] = value);"], ["\n            const ", " = (function (geti, seti) {\n                const cache = Object.create(null);\n                return name => cache[name] || (cache[name] = { get value() { return geti(name); }, set value(v) { seti(name, v); } });\n            })(name => super[name], (name, value) => super[name] = value);"]), "_super")
     };
 })(ts || (ts = {}));
+/*@internal*/
 var ts;
 (function (ts) {
     var ESNextSubstitutionFlags;
     (function (ESNextSubstitutionFlags) {
+        /** Enables substitutions for async methods with `super` calls. */
         ESNextSubstitutionFlags[ESNextSubstitutionFlags["AsyncMethodsWithSuper"] = 1] = "AsyncMethodsWithSuper";
     })(ESNextSubstitutionFlags || (ESNextSubstitutionFlags = {}));
     function transformESNext(context) {
@@ -52600,76 +64540,77 @@ var ts;
             return visited;
         }
         function visitor(node) {
-            return visitorWorker(node, false);
+            return visitorWorker(node, /*noDestructuringValue*/ false);
         }
         function visitorNoDestructuringValue(node) {
-            return visitorWorker(node, true);
+            return visitorWorker(node, /*noDestructuringValue*/ true);
         }
         function visitorNoAsyncModifier(node) {
-            if (node.kind === 120) {
+            if (node.kind === 120 /* AsyncKeyword */) {
                 return undefined;
             }
             return node;
         }
         function visitorWorker(node, noDestructuringValue) {
-            if ((node.transformFlags & 8) === 0) {
+            if ((node.transformFlags & 8 /* ContainsESNext */) === 0) {
                 return node;
             }
             switch (node.kind) {
-                case 197:
+                case 197 /* AwaitExpression */:
                     return visitAwaitExpression(node);
-                case 203:
+                case 203 /* YieldExpression */:
                     return visitYieldExpression(node);
-                case 225:
+                case 225 /* ReturnStatement */:
                     return visitReturnStatement(node);
-                case 228:
+                case 228 /* LabeledStatement */:
                     return visitLabeledStatement(node);
-                case 184:
+                case 184 /* ObjectLiteralExpression */:
                     return visitObjectLiteralExpression(node);
-                case 200:
+                case 200 /* BinaryExpression */:
                     return visitBinaryExpression(node, noDestructuringValue);
-                case 232:
+                case 232 /* VariableDeclaration */:
                     return visitVariableDeclaration(node);
-                case 222:
-                    return visitForOfStatement(node, undefined);
-                case 220:
+                case 222 /* ForOfStatement */:
+                    return visitForOfStatement(node, /*outermostLabeledStatement*/ undefined);
+                case 220 /* ForStatement */:
                     return visitForStatement(node);
-                case 196:
+                case 196 /* VoidExpression */:
                     return visitVoidExpression(node);
-                case 155:
+                case 155 /* Constructor */:
                     return visitConstructorDeclaration(node);
-                case 154:
+                case 154 /* MethodDeclaration */:
                     return visitMethodDeclaration(node);
-                case 156:
+                case 156 /* GetAccessor */:
                     return visitGetAccessorDeclaration(node);
-                case 157:
+                case 157 /* SetAccessor */:
                     return visitSetAccessorDeclaration(node);
-                case 234:
+                case 234 /* FunctionDeclaration */:
                     return visitFunctionDeclaration(node);
-                case 192:
+                case 192 /* FunctionExpression */:
                     return visitFunctionExpression(node);
-                case 193:
+                case 193 /* ArrowFunction */:
                     return visitArrowFunction(node);
-                case 149:
+                case 149 /* Parameter */:
                     return visitParameter(node);
-                case 216:
+                case 216 /* ExpressionStatement */:
                     return visitExpressionStatement(node);
-                case 191:
+                case 191 /* ParenthesizedExpression */:
                     return visitParenthesizedExpression(node, noDestructuringValue);
-                case 269:
+                case 269 /* CatchClause */:
                     return visitCatchClause(node);
                 default:
                     return ts.visitEachChild(node, visitor, context);
             }
         }
         function visitAwaitExpression(node) {
-            if (enclosingFunctionFlags & 2 && enclosingFunctionFlags & 1) {
-                return ts.setOriginalNode(ts.setTextRange(ts.createYield(createAwaitHelper(context, ts.visitNode(node.expression, visitor, ts.isExpression))), node), node);
+            if (enclosingFunctionFlags & 2 /* Async */ && enclosingFunctionFlags & 1 /* Generator */) {
+                return ts.setOriginalNode(ts.setTextRange(ts.createYield(createAwaitHelper(context, ts.visitNode(node.expression, visitor, ts.isExpression))), 
+                /*location*/ node), node);
             }
             return ts.visitEachChild(node, visitor, context);
         }
         function visitYieldExpression(node) {
-            if (enclosingFunctionFlags & 2 && enclosingFunctionFlags & 1) {
+            if (enclosingFunctionFlags & 2 /* Async */ && enclosingFunctionFlags & 1 /* Generator */) {
                 if (node.asteriskToken) {
                     var expression = ts.visitNode(node.expression, visitor, ts.isExpression);
                     return ts.setOriginalNode(ts.setTextRange(ts.createYield(createAwaitHelper(context, ts.updateYield(node, node.asteriskToken, createAsyncDelegatorHelper(context, createAsyncValuesHelper(context, expression, expression), expression)))), node), node);
@@ -52681,15 +64622,15 @@ var ts;
             return ts.visitEachChild(node, visitor, context);
         }
         function visitReturnStatement(node) {
-            if (enclosingFunctionFlags & 2 && enclosingFunctionFlags & 1) {
+            if (enclosingFunctionFlags & 2 /* Async */ && enclosingFunctionFlags & 1 /* Generator */) {
                 return ts.updateReturn(node, createDownlevelAwait(node.expression ? ts.visitNode(node.expression, visitor, ts.isExpression) : ts.createVoidZero()));
             }
             return ts.visitEachChild(node, visitor, context);
         }
         function visitLabeledStatement(node) {
-            if (enclosingFunctionFlags & 2) {
+            if (enclosingFunctionFlags & 2 /* Async */) {
                 var statement = ts.unwrapInnermostStatementOfLabel(node);
-                if (statement.kind === 222 && statement.awaitModifier) {
+                if (statement.kind === 222 /* ForOfStatement */ && statement.awaitModifier) {
                     return visitForOfStatement(statement, node);
                 }
                 return ts.restoreEnclosingLabel(ts.visitEachChild(statement, visitor, context), node);
@@ -52701,7 +64642,7 @@ var ts;
             var objects = [];
             for (var _i = 0, elements_4 = elements; _i < elements_4.length; _i++) {
                 var e = elements_4[_i];
-                if (e.kind === 272) {
+                if (e.kind === 272 /* SpreadAssignment */) {
                     if (chunkObject) {
                         objects.push(ts.createObjectLiteral(chunkObject));
                         chunkObject = undefined;
@@ -52710,7 +64651,7 @@ var ts;
                     objects.push(ts.visitNode(target, visitor, ts.isExpression));
                 }
                 else {
-                    chunkObject = ts.append(chunkObject, e.kind === 270
+                    chunkObject = ts.append(chunkObject, e.kind === 270 /* PropertyAssignment */
                         ? ts.createPropertyAssignment(e.name, ts.visitNode(e.initializer, visitor, ts.isExpression))
                         : ts.visitNode(e, visitor, ts.isObjectLiteralElementLike));
                 }
@@ -52721,9 +64662,14 @@ var ts;
             return objects;
         }
         function visitObjectLiteralExpression(node) {
-            if (node.transformFlags & 1048576) {
+            if (node.transformFlags & 1048576 /* ContainsObjectSpread */) {
+                // spread elements emit like so:
+                // non-spread elements are chunked together into object literals, and then all are passed to __assign:
+                //     { a, ...o, b } => __assign({a}, o, {b});
+                // If the first element is a spread element, then the first argument to __assign is {}:
+                //     { ...o, a, b, ...o2 } => __assign({}, o, {a, b}, o2)
                 var objects = chunkObjectLiteralElements(node.properties);
-                if (objects.length && objects[0].kind !== 184) {
+                if (objects.length && objects[0].kind !== 184 /* ObjectLiteralExpression */) {
                     objects.unshift(ts.createObjectLiteral());
                 }
                 return createAssignHelper(context, objects);
@@ -52738,22 +64684,33 @@ var ts;
         }
         function visitCatchClause(node) {
             if (!node.variableDeclaration) {
-                return ts.updateCatchClause(node, ts.createVariableDeclaration(ts.createTempVariable(undefined)), ts.visitNode(node.block, visitor, ts.isBlock));
+                return ts.updateCatchClause(node, ts.createVariableDeclaration(ts.createTempVariable(/*recordTempVariable*/ undefined)), ts.visitNode(node.block, visitor, ts.isBlock));
             }
             return ts.visitEachChild(node, visitor, context);
         }
+        /**
+         * Visits a BinaryExpression that contains a destructuring assignment.
+         *
+         * @param node A BinaryExpression node.
+         */
         function visitBinaryExpression(node, noDestructuringValue) {
-            if (ts.isDestructuringAssignment(node) && node.left.transformFlags & 1048576) {
-                return ts.flattenDestructuringAssignment(node, visitor, context, 1, !noDestructuringValue);
+            if (ts.isDestructuringAssignment(node) && node.left.transformFlags & 1048576 /* ContainsObjectRest */) {
+                return ts.flattenDestructuringAssignment(node, visitor, context, 1 /* ObjectRest */, !noDestructuringValue);
             }
-            else if (node.operatorToken.kind === 26) {
+            else if (node.operatorToken.kind === 26 /* CommaToken */) {
                 return ts.updateBinary(node, ts.visitNode(node.left, visitorNoDestructuringValue, ts.isExpression), ts.visitNode(node.right, noDestructuringValue ? visitorNoDestructuringValue : visitor, ts.isExpression));
             }
             return ts.visitEachChild(node, visitor, context);
         }
+        /**
+         * Visits a VariableDeclaration node with a binding pattern.
+         *
+         * @param node A VariableDeclaration node.
+         */
         function visitVariableDeclaration(node) {
-            if (ts.isBindingPattern(node.name) && node.name.transformFlags & 1048576) {
-                return ts.flattenDestructuringBinding(node, visitor, context, 1);
+            // If we are here it is because the name contains a binding pattern with a rest somewhere in it.
+            if (ts.isBindingPattern(node.name) && node.name.transformFlags & 1048576 /* ContainsObjectRest */) {
+                return ts.flattenDestructuringBinding(node, visitor, context, 1 /* ObjectRest */);
             }
             return ts.visitEachChild(node, visitor, context);
         }
@@ -52763,8 +64720,13 @@ var ts;
         function visitVoidExpression(node) {
             return ts.visitEachChild(node, visitorNoDestructuringValue, context);
         }
+        /**
+         * Visits a ForOfStatement and converts it into a ES2015-compatible ForOfStatement.
+         *
+         * @param node A ForOfStatement.
+         */
         function visitForOfStatement(node, outermostLabeledStatement) {
-            if (node.initializer.transformFlags & 1048576) {
+            if (node.initializer.transformFlags & 1048576 /* ContainsObjectRest */) {
                 node = transformForOfStatementWithObjectRest(node);
             }
             if (node.awaitModifier) {
@@ -52779,7 +64741,7 @@ var ts;
             if (ts.isVariableDeclarationList(initializerWithoutParens) || ts.isAssignmentPattern(initializerWithoutParens)) {
                 var bodyLocation = void 0;
                 var statementsLocation = void 0;
-                var temp = ts.createTempVariable(undefined);
+                var temp = ts.createTempVariable(/*recordTempVariable*/ undefined);
                 var statements = [ts.createForOfBindingStatement(initializerWithoutParens, temp)];
                 if (ts.isBlock(node.statement)) {
                     ts.addRange(statements, node.statement.statements);
@@ -52793,7 +64755,8 @@ var ts;
                 }
                 return ts.updateForOf(node, node.awaitModifier, ts.setTextRange(ts.createVariableDeclarationList([
                     ts.setTextRange(ts.createVariableDeclaration(temp), node.initializer)
-                ], 1), node.initializer), node.expression, ts.setTextRange(ts.createBlock(ts.setTextRange(ts.createNodeArray(statements), statementsLocation), true), bodyLocation));
+                ], 1 /* Let */), node.initializer), node.expression, ts.setTextRange(ts.createBlock(ts.setTextRange(ts.createNodeArray(statements), statementsLocation), 
+                /*multiLine*/ true), bodyLocation));
             }
             return node;
         }
@@ -52811,80 +64774,102 @@ var ts;
             else {
                 statements.push(statement);
             }
-            return ts.setEmitFlags(ts.setTextRange(ts.createBlock(ts.setTextRange(ts.createNodeArray(statements), statementsLocation), true), bodyLocation), 48 | 384);
+            return ts.setEmitFlags(ts.setTextRange(ts.createBlock(ts.setTextRange(ts.createNodeArray(statements), statementsLocation), 
+            /*multiLine*/ true), bodyLocation), 48 /* NoSourceMap */ | 384 /* NoTokenSourceMaps */);
         }
         function createDownlevelAwait(expression) {
-            return enclosingFunctionFlags & 1
-                ? ts.createYield(undefined, createAwaitHelper(context, expression))
+            return enclosingFunctionFlags & 1 /* Generator */
+                ? ts.createYield(/*asteriskToken*/ undefined, createAwaitHelper(context, expression))
                 : ts.createAwait(expression);
         }
         function transformForAwaitOfStatement(node, outermostLabeledStatement) {
             var expression = ts.visitNode(node.expression, visitor, ts.isExpression);
-            var iterator = ts.isIdentifier(expression) ? ts.getGeneratedNameForNode(expression) : ts.createTempVariable(undefined);
-            var result = ts.isIdentifier(expression) ? ts.getGeneratedNameForNode(iterator) : ts.createTempVariable(undefined);
+            var iterator = ts.isIdentifier(expression) ? ts.getGeneratedNameForNode(expression) : ts.createTempVariable(/*recordTempVariable*/ undefined);
+            var result = ts.isIdentifier(expression) ? ts.getGeneratedNameForNode(iterator) : ts.createTempVariable(/*recordTempVariable*/ undefined);
             var errorRecord = ts.createUniqueName("e");
             var catchVariable = ts.getGeneratedNameForNode(errorRecord);
-            var returnMethod = ts.createTempVariable(undefined);
-            var callValues = createAsyncValuesHelper(context, expression, node.expression);
-            var callNext = ts.createCall(ts.createPropertyAccess(iterator, "next"), undefined, []);
+            var returnMethod = ts.createTempVariable(/*recordTempVariable*/ undefined);
+            var callValues = createAsyncValuesHelper(context, expression, /*location*/ node.expression);
+            var callNext = ts.createCall(ts.createPropertyAccess(iterator, "next"), /*typeArguments*/ undefined, []);
             var getDone = ts.createPropertyAccess(result, "done");
             var getValue = ts.createPropertyAccess(result, "value");
             var callReturn = ts.createFunctionCall(returnMethod, iterator, []);
             hoistVariableDeclaration(errorRecord);
             hoistVariableDeclaration(returnMethod);
-            var forStatement = ts.setEmitFlags(ts.setTextRange(ts.createFor(ts.setEmitFlags(ts.setTextRange(ts.createVariableDeclarationList([
-                ts.setTextRange(ts.createVariableDeclaration(iterator, undefined, callValues), node.expression),
+            var forStatement = ts.setEmitFlags(ts.setTextRange(ts.createFor(
+            /*initializer*/ ts.setEmitFlags(ts.setTextRange(ts.createVariableDeclarationList([
+                ts.setTextRange(ts.createVariableDeclaration(iterator, /*type*/ undefined, callValues), node.expression),
                 ts.createVariableDeclaration(result)
-            ]), node.expression), 2097152), ts.createComma(ts.createAssignment(result, createDownlevelAwait(callNext)), ts.createLogicalNot(getDone)), undefined, convertForOfStatementHead(node, getValue)), node), 256);
+            ]), node.expression), 2097152 /* NoHoisting */), 
+            /*condition*/ ts.createComma(ts.createAssignment(result, createDownlevelAwait(callNext)), ts.createLogicalNot(getDone)), 
+            /*incrementor*/ undefined, 
+            /*statement*/ convertForOfStatementHead(node, getValue)), 
+            /*location*/ node), 256 /* NoTokenTrailingSourceMaps */);
             return ts.createTry(ts.createBlock([
                 ts.restoreEnclosingLabel(forStatement, outermostLabeledStatement)
             ]), ts.createCatchClause(ts.createVariableDeclaration(catchVariable), ts.setEmitFlags(ts.createBlock([
                 ts.createStatement(ts.createAssignment(errorRecord, ts.createObjectLiteral([
                     ts.createPropertyAssignment("error", catchVariable)
                 ])))
-            ]), 1)), ts.createBlock([
-                ts.createTry(ts.createBlock([
-                    ts.setEmitFlags(ts.createIf(ts.createLogicalAnd(ts.createLogicalAnd(result, ts.createLogicalNot(getDone)), ts.createAssignment(returnMethod, ts.createPropertyAccess(iterator, "return"))), ts.createStatement(createDownlevelAwait(callReturn))), 1)
-                ]), undefined, ts.setEmitFlags(ts.createBlock([
-                    ts.setEmitFlags(ts.createIf(errorRecord, ts.createThrow(ts.createPropertyAccess(errorRecord, "error"))), 1)
-                ]), 1))
+            ]), 1 /* SingleLine */)), ts.createBlock([
+                ts.createTry(
+                /*tryBlock*/ ts.createBlock([
+                    ts.setEmitFlags(ts.createIf(ts.createLogicalAnd(ts.createLogicalAnd(result, ts.createLogicalNot(getDone)), ts.createAssignment(returnMethod, ts.createPropertyAccess(iterator, "return"))), ts.createStatement(createDownlevelAwait(callReturn))), 1 /* SingleLine */)
+                ]), 
+                /*catchClause*/ undefined, 
+                /*finallyBlock*/ ts.setEmitFlags(ts.createBlock([
+                    ts.setEmitFlags(ts.createIf(errorRecord, ts.createThrow(ts.createPropertyAccess(errorRecord, "error"))), 1 /* SingleLine */)
+                ]), 1 /* SingleLine */))
             ]));
         }
         function visitParameter(node) {
-            if (node.transformFlags & 1048576) {
-                return ts.updateParameter(node, undefined, undefined, node.dotDotDotToken, ts.getGeneratedNameForNode(node), undefined, undefined, ts.visitNode(node.initializer, visitor, ts.isExpression));
+            if (node.transformFlags & 1048576 /* ContainsObjectRest */) {
+                // Binding patterns are converted into a generated name and are
+                // evaluated inside the function body.
+                return ts.updateParameter(node, 
+                /*decorators*/ undefined, 
+                /*modifiers*/ undefined, node.dotDotDotToken, ts.getGeneratedNameForNode(node), 
+                /*questionToken*/ undefined, 
+                /*type*/ undefined, ts.visitNode(node.initializer, visitor, ts.isExpression));
             }
             return ts.visitEachChild(node, visitor, context);
         }
         function visitConstructorDeclaration(node) {
             var savedEnclosingFunctionFlags = enclosingFunctionFlags;
-            enclosingFunctionFlags = 0;
-            var updated = ts.updateConstructor(node, undefined, node.modifiers, ts.visitParameterList(node.parameters, visitor, context), transformFunctionBody(node));
+            enclosingFunctionFlags = 0 /* Normal */;
+            var updated = ts.updateConstructor(node, 
+            /*decorators*/ undefined, node.modifiers, ts.visitParameterList(node.parameters, visitor, context), transformFunctionBody(node));
             enclosingFunctionFlags = savedEnclosingFunctionFlags;
             return updated;
         }
         function visitGetAccessorDeclaration(node) {
             var savedEnclosingFunctionFlags = enclosingFunctionFlags;
-            enclosingFunctionFlags = 0;
-            var updated = ts.updateGetAccessor(node, undefined, node.modifiers, ts.visitNode(node.name, visitor, ts.isPropertyName), ts.visitParameterList(node.parameters, visitor, context), undefined, transformFunctionBody(node));
+            enclosingFunctionFlags = 0 /* Normal */;
+            var updated = ts.updateGetAccessor(node, 
+            /*decorators*/ undefined, node.modifiers, ts.visitNode(node.name, visitor, ts.isPropertyName), ts.visitParameterList(node.parameters, visitor, context), 
+            /*type*/ undefined, transformFunctionBody(node));
             enclosingFunctionFlags = savedEnclosingFunctionFlags;
             return updated;
         }
         function visitSetAccessorDeclaration(node) {
             var savedEnclosingFunctionFlags = enclosingFunctionFlags;
-            enclosingFunctionFlags = 0;
-            var updated = ts.updateSetAccessor(node, undefined, node.modifiers, ts.visitNode(node.name, visitor, ts.isPropertyName), ts.visitParameterList(node.parameters, visitor, context), transformFunctionBody(node));
+            enclosingFunctionFlags = 0 /* Normal */;
+            var updated = ts.updateSetAccessor(node, 
+            /*decorators*/ undefined, node.modifiers, ts.visitNode(node.name, visitor, ts.isPropertyName), ts.visitParameterList(node.parameters, visitor, context), transformFunctionBody(node));
             enclosingFunctionFlags = savedEnclosingFunctionFlags;
             return updated;
         }
         function visitMethodDeclaration(node) {
             var savedEnclosingFunctionFlags = enclosingFunctionFlags;
             enclosingFunctionFlags = ts.getFunctionFlags(node);
-            var updated = ts.updateMethod(node, undefined, enclosingFunctionFlags & 1
+            var updated = ts.updateMethod(node, 
+            /*decorators*/ undefined, enclosingFunctionFlags & 1 /* Generator */
                 ? ts.visitNodes(node.modifiers, visitorNoAsyncModifier, ts.isModifier)
-                : node.modifiers, enclosingFunctionFlags & 2
+                : node.modifiers, enclosingFunctionFlags & 2 /* Async */
                 ? undefined
-                : node.asteriskToken, ts.visitNode(node.name, visitor, ts.isPropertyName), ts.visitNode(undefined, visitor, ts.isToken), undefined, ts.visitParameterList(node.parameters, visitor, context), undefined, enclosingFunctionFlags & 2 && enclosingFunctionFlags & 1
+                : node.asteriskToken, ts.visitNode(node.name, visitor, ts.isPropertyName), ts.visitNode(/*questionToken*/ undefined, visitor, ts.isToken), 
+            /*typeParameters*/ undefined, ts.visitParameterList(node.parameters, visitor, context), 
+            /*type*/ undefined, enclosingFunctionFlags & 2 /* Async */ && enclosingFunctionFlags & 1 /* Generator */
                 ? transformAsyncGeneratorFunctionBody(node)
                 : transformFunctionBody(node));
             enclosingFunctionFlags = savedEnclosingFunctionFlags;
@@ -52893,11 +64878,14 @@ var ts;
         function visitFunctionDeclaration(node) {
             var savedEnclosingFunctionFlags = enclosingFunctionFlags;
             enclosingFunctionFlags = ts.getFunctionFlags(node);
-            var updated = ts.updateFunctionDeclaration(node, undefined, enclosingFunctionFlags & 1
+            var updated = ts.updateFunctionDeclaration(node, 
+            /*decorators*/ undefined, enclosingFunctionFlags & 1 /* Generator */
                 ? ts.visitNodes(node.modifiers, visitorNoAsyncModifier, ts.isModifier)
-                : node.modifiers, enclosingFunctionFlags & 2
+                : node.modifiers, enclosingFunctionFlags & 2 /* Async */
                 ? undefined
-                : node.asteriskToken, node.name, undefined, ts.visitParameterList(node.parameters, visitor, context), undefined, enclosingFunctionFlags & 2 && enclosingFunctionFlags & 1
+                : node.asteriskToken, node.name, 
+            /*typeParameters*/ undefined, ts.visitParameterList(node.parameters, visitor, context), 
+            /*type*/ undefined, enclosingFunctionFlags & 2 /* Async */ && enclosingFunctionFlags & 1 /* Generator */
                 ? transformAsyncGeneratorFunctionBody(node)
                 : transformFunctionBody(node));
             enclosingFunctionFlags = savedEnclosingFunctionFlags;
@@ -52906,18 +64894,22 @@ var ts;
         function visitArrowFunction(node) {
             var savedEnclosingFunctionFlags = enclosingFunctionFlags;
             enclosingFunctionFlags = ts.getFunctionFlags(node);
-            var updated = ts.updateArrowFunction(node, node.modifiers, undefined, ts.visitParameterList(node.parameters, visitor, context), undefined, node.equalsGreaterThanToken, transformFunctionBody(node));
+            var updated = ts.updateArrowFunction(node, node.modifiers, 
+            /*typeParameters*/ undefined, ts.visitParameterList(node.parameters, visitor, context), 
+            /*type*/ undefined, node.equalsGreaterThanToken, transformFunctionBody(node));
             enclosingFunctionFlags = savedEnclosingFunctionFlags;
             return updated;
         }
         function visitFunctionExpression(node) {
             var savedEnclosingFunctionFlags = enclosingFunctionFlags;
             enclosingFunctionFlags = ts.getFunctionFlags(node);
-            var updated = ts.updateFunctionExpression(node, enclosingFunctionFlags & 1
+            var updated = ts.updateFunctionExpression(node, enclosingFunctionFlags & 1 /* Generator */
                 ? ts.visitNodes(node.modifiers, visitorNoAsyncModifier, ts.isModifier)
-                : node.modifiers, enclosingFunctionFlags & 2
+                : node.modifiers, enclosingFunctionFlags & 2 /* Async */
                 ? undefined
-                : node.asteriskToken, node.name, undefined, ts.visitParameterList(node.parameters, visitor, context), undefined, enclosingFunctionFlags & 2 && enclosingFunctionFlags & 1
+                : node.asteriskToken, node.name, 
+            /*typeParameters*/ undefined, ts.visitParameterList(node.parameters, visitor, context), 
+            /*type*/ undefined, enclosingFunctionFlags & 2 /* Async */ && enclosingFunctionFlags & 1 /* Generator */
                 ? transformAsyncGeneratorFunctionBody(node)
                 : transformFunctionBody(node));
             enclosingFunctionFlags = savedEnclosingFunctionFlags;
@@ -52926,17 +64918,23 @@ var ts;
         function transformAsyncGeneratorFunctionBody(node) {
             resumeLexicalEnvironment();
             var statements = [];
-            var statementOffset = ts.addPrologue(statements, node.body.statements, false, visitor);
+            var statementOffset = ts.addPrologue(statements, node.body.statements, /*ensureUseStrict*/ false, visitor);
             appendObjectRestAssignmentsIfNeeded(statements, node);
-            statements.push(ts.createReturn(createAsyncGeneratorHelper(context, ts.createFunctionExpression(undefined, ts.createToken(39), node.name && ts.getGeneratedNameForNode(node.name), undefined, [], undefined, ts.updateBlock(node.body, ts.visitLexicalEnvironment(node.body.statements, visitor, context, statementOffset))))));
+            statements.push(ts.createReturn(createAsyncGeneratorHelper(context, ts.createFunctionExpression(
+            /*modifiers*/ undefined, ts.createToken(39 /* AsteriskToken */), node.name && ts.getGeneratedNameForNode(node.name), 
+            /*typeParameters*/ undefined, 
+            /*parameters*/ [], 
+            /*type*/ undefined, ts.updateBlock(node.body, ts.visitLexicalEnvironment(node.body.statements, visitor, context, statementOffset))))));
             ts.prependStatements(statements, endLexicalEnvironment());
             var block = ts.updateBlock(node.body, statements);
-            if (languageVersion >= 2) {
-                if (resolver.getNodeCheckFlags(node) & 4096) {
+            // Minor optimization, emit `_super` helper to capture `super` access in an arrow.
+            // This step isn't needed if we eventually transform this to ES5.
+            if (languageVersion >= 2 /* ES2015 */) {
+                if (resolver.getNodeCheckFlags(node) & 4096 /* AsyncMethodWithSuperBinding */) {
                     enableSubstitutionForAsyncMethodsWithSuper();
                     ts.addEmitHelper(block, ts.advancedAsyncSuperHelper);
                 }
-                else if (resolver.getNodeCheckFlags(node) & 2048) {
+                else if (resolver.getNodeCheckFlags(node) & 2048 /* AsyncMethodWithSuper */) {
                     enableSubstitutionForAsyncMethodsWithSuper();
                     ts.addEmitHelper(block, ts.asyncSuperHelper);
                 }
@@ -52949,12 +64947,12 @@ var ts;
             var statements = [];
             var body = ts.visitNode(node.body, visitor, ts.isConciseBody);
             if (ts.isBlock(body)) {
-                statementOffset = ts.addPrologue(statements, body.statements, false, visitor);
+                statementOffset = ts.addPrologue(statements, body.statements, /*ensureUseStrict*/ false, visitor);
             }
-            ts.addRange(statements, appendObjectRestAssignmentsIfNeeded(undefined, node));
+            ts.addRange(statements, appendObjectRestAssignmentsIfNeeded(/*statements*/ undefined, node));
             var leadingStatements = endLexicalEnvironment();
             if (statementOffset > 0 || ts.some(statements) || ts.some(leadingStatements)) {
-                var block = ts.convertToFunctionBody(body, true);
+                var block = ts.convertToFunctionBody(body, /*multiLine*/ true);
                 ts.prependStatements(statements, leadingStatements);
                 ts.addRange(statements, block.statements.slice(statementOffset));
                 return ts.updateBlock(block, ts.setTextRange(ts.createNodeArray(statements), block.statements));
@@ -52964,12 +64962,15 @@ var ts;
         function appendObjectRestAssignmentsIfNeeded(statements, node) {
             for (var _i = 0, _a = node.parameters; _i < _a.length; _i++) {
                 var parameter = _a[_i];
-                if (parameter.transformFlags & 1048576) {
+                if (parameter.transformFlags & 1048576 /* ContainsObjectRest */) {
                     var temp = ts.getGeneratedNameForNode(parameter);
-                    var declarations = ts.flattenDestructuringBinding(parameter, visitor, context, 1, temp, false, true);
+                    var declarations = ts.flattenDestructuringBinding(parameter, visitor, context, 1 /* ObjectRest */, temp, 
+                    /*doNotRecordTempVariablesInLine*/ false, 
+                    /*skipInitializer*/ true);
                     if (ts.some(declarations)) {
-                        var statement = ts.createVariableStatement(undefined, ts.createVariableDeclarationList(declarations));
-                        ts.setEmitFlags(statement, 1048576);
+                        var statement = ts.createVariableStatement(
+                        /*modifiers*/ undefined, ts.createVariableDeclarationList(declarations));
+                        ts.setEmitFlags(statement, 1048576 /* CustomPrologue */);
                         statements = ts.append(statements, statement);
                     }
                 }
@@ -52977,21 +64978,33 @@ var ts;
             return statements;
         }
         function enableSubstitutionForAsyncMethodsWithSuper() {
-            if ((enabledSubstitutions & 1) === 0) {
-                enabledSubstitutions |= 1;
-                context.enableSubstitution(187);
-                context.enableSubstitution(185);
-                context.enableSubstitution(186);
-                context.enableEmitNotification(235);
-                context.enableEmitNotification(154);
-                context.enableEmitNotification(156);
-                context.enableEmitNotification(157);
-                context.enableEmitNotification(155);
+            if ((enabledSubstitutions & 1 /* AsyncMethodsWithSuper */) === 0) {
+                enabledSubstitutions |= 1 /* AsyncMethodsWithSuper */;
+                // We need to enable substitutions for call, property access, and element access
+                // if we need to rewrite super calls.
+                context.enableSubstitution(187 /* CallExpression */);
+                context.enableSubstitution(185 /* PropertyAccessExpression */);
+                context.enableSubstitution(186 /* ElementAccessExpression */);
+                // We need to be notified when entering and exiting declarations that bind super.
+                context.enableEmitNotification(235 /* ClassDeclaration */);
+                context.enableEmitNotification(154 /* MethodDeclaration */);
+                context.enableEmitNotification(156 /* GetAccessor */);
+                context.enableEmitNotification(157 /* SetAccessor */);
+                context.enableEmitNotification(155 /* Constructor */);
             }
         }
+        /**
+         * Called by the printer just before a node is printed.
+         *
+         * @param hint A hint as to the intended usage of the node.
+         * @param node The node to be printed.
+         * @param emitCallback The callback used to emit the node.
+         */
         function onEmitNode(hint, node, emitCallback) {
-            if (enabledSubstitutions & 1 && isSuperContainer(node)) {
-                var superContainerFlags = resolver.getNodeCheckFlags(node) & (2048 | 4096);
+            // If we need to support substitutions for `super` in an async method,
+            // we should track it here.
+            if (enabledSubstitutions & 1 /* AsyncMethodsWithSuper */ && isSuperContainer(node)) {
+                var superContainerFlags = resolver.getNodeCheckFlags(node) & (2048 /* AsyncMethodWithSuper */ | 4096 /* AsyncMethodWithSuperBinding */);
                 if (superContainerFlags !== enclosingSuperContainerFlags) {
                     var savedEnclosingSuperContainerFlags = enclosingSuperContainerFlags;
                     enclosingSuperContainerFlags = superContainerFlags;
@@ -53002,32 +65015,38 @@ var ts;
             }
             previousOnEmitNode(hint, node, emitCallback);
         }
+        /**
+         * Hooks node substitutions.
+         *
+         * @param hint The context for the emitter.
+         * @param node The node to substitute.
+         */
         function onSubstituteNode(hint, node) {
             node = previousOnSubstituteNode(hint, node);
-            if (hint === 1 && enclosingSuperContainerFlags) {
+            if (hint === 1 /* Expression */ && enclosingSuperContainerFlags) {
                 return substituteExpression(node);
             }
             return node;
         }
         function substituteExpression(node) {
             switch (node.kind) {
-                case 185:
+                case 185 /* PropertyAccessExpression */:
                     return substitutePropertyAccessExpression(node);
-                case 186:
+                case 186 /* ElementAccessExpression */:
                     return substituteElementAccessExpression(node);
-                case 187:
+                case 187 /* CallExpression */:
                     return substituteCallExpression(node);
             }
             return node;
         }
         function substitutePropertyAccessExpression(node) {
-            if (node.expression.kind === 97) {
+            if (node.expression.kind === 97 /* SuperKeyword */) {
                 return createSuperAccessInAsyncMethod(ts.createLiteral(ts.idText(node.name)), node);
             }
             return node;
         }
         function substituteElementAccessExpression(node) {
-            if (node.expression.kind === 97) {
+            if (node.expression.kind === 97 /* SuperKeyword */) {
                 return createSuperAccessInAsyncMethod(node.argumentExpression, node);
             }
             return node;
@@ -53038,7 +65057,8 @@ var ts;
                 var argumentExpression = ts.isPropertyAccessExpression(expression)
                     ? substitutePropertyAccessExpression(expression)
                     : substituteElementAccessExpression(expression);
-                return ts.createCall(ts.createPropertyAccess(argumentExpression, "call"), undefined, [
+                return ts.createCall(ts.createPropertyAccess(argumentExpression, "call"), 
+                /*typeArguments*/ undefined, [
                     ts.createThis()
                 ].concat(node.arguments));
             }
@@ -53046,18 +65066,20 @@ var ts;
         }
         function isSuperContainer(node) {
             var kind = node.kind;
-            return kind === 235
-                || kind === 155
-                || kind === 154
-                || kind === 156
-                || kind === 157;
+            return kind === 235 /* ClassDeclaration */
+                || kind === 155 /* Constructor */
+                || kind === 154 /* MethodDeclaration */
+                || kind === 156 /* GetAccessor */
+                || kind === 157 /* SetAccessor */;
         }
         function createSuperAccessInAsyncMethod(argumentExpression, location) {
-            if (enclosingSuperContainerFlags & 4096) {
-                return ts.setTextRange(ts.createPropertyAccess(ts.createCall(ts.createIdentifier("_super"), undefined, [argumentExpression]), "value"), location);
+            if (enclosingSuperContainerFlags & 4096 /* AsyncMethodWithSuperBinding */) {
+                return ts.setTextRange(ts.createPropertyAccess(ts.createCall(ts.createIdentifier("_super"), 
+                /*typeArguments*/ undefined, [argumentExpression]), "value"), location);
             }
             else {
-                return ts.setTextRange(ts.createCall(ts.createIdentifier("_super"), undefined, [argumentExpression]), location);
+                return ts.setTextRange(ts.createCall(ts.createIdentifier("_super"), 
+                /*typeArguments*/ undefined, [argumentExpression]), location);
             }
         }
     }
@@ -53069,11 +65091,13 @@ var ts;
         text: "\n            var __assign = (this && this.__assign) || Object.assign || function(t) {\n                for (var s, i = 1, n = arguments.length; i < n; i++) {\n                    s = arguments[i];\n                    for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))\n                        t[p] = s[p];\n                }\n                return t;\n            };"
     };
     function createAssignHelper(context, attributesSegments) {
-        if (context.getCompilerOptions().target >= 2) {
-            return ts.createCall(ts.createPropertyAccess(ts.createIdentifier("Object"), "assign"), undefined, attributesSegments);
+        if (context.getCompilerOptions().target >= 2 /* ES2015 */) {
+            return ts.createCall(ts.createPropertyAccess(ts.createIdentifier("Object"), "assign"), 
+            /*typeArguments*/ undefined, attributesSegments);
         }
         context.requestEmitHelper(assignHelper);
-        return ts.createCall(ts.getHelperName("__assign"), undefined, attributesSegments);
+        return ts.createCall(ts.getHelperName("__assign"), 
+        /*typeArguments*/ undefined, attributesSegments);
     }
     ts.createAssignHelper = createAssignHelper;
     var awaitHelper = {
@@ -53083,7 +65107,7 @@ var ts;
     };
     function createAwaitHelper(context, expression) {
         context.requestEmitHelper(awaitHelper);
-        return ts.createCall(ts.getHelperName("__await"), undefined, [expression]);
+        return ts.createCall(ts.getHelperName("__await"), /*typeArguments*/ undefined, [expression]);
     }
     var asyncGeneratorHelper = {
         name: "typescript:asyncGenerator",
@@ -53093,8 +65117,10 @@ var ts;
     function createAsyncGeneratorHelper(context, generatorFunc) {
         context.requestEmitHelper(awaitHelper);
         context.requestEmitHelper(asyncGeneratorHelper);
-        (generatorFunc.emitNode || (generatorFunc.emitNode = {})).flags |= 262144;
-        return ts.createCall(ts.getHelperName("__asyncGenerator"), undefined, [
+        // Mark this node as originally an async function
+        (generatorFunc.emitNode || (generatorFunc.emitNode = {})).flags |= 262144 /* AsyncFunctionBody */;
+        return ts.createCall(ts.getHelperName("__asyncGenerator"), 
+        /*typeArguments*/ undefined, [
             ts.createThis(),
             ts.createIdentifier("arguments"),
             generatorFunc
@@ -53108,7 +65134,8 @@ var ts;
     function createAsyncDelegatorHelper(context, expression, location) {
         context.requestEmitHelper(awaitHelper);
         context.requestEmitHelper(asyncDelegator);
-        return ts.setTextRange(ts.createCall(ts.getHelperName("__asyncDelegator"), undefined, [expression]), location);
+        return ts.setTextRange(ts.createCall(ts.getHelperName("__asyncDelegator"), 
+        /*typeArguments*/ undefined, [expression]), location);
     }
     var asyncValues = {
         name: "typescript:asyncValues",
@@ -53117,15 +65144,22 @@ var ts;
     };
     function createAsyncValuesHelper(context, expression, location) {
         context.requestEmitHelper(asyncValues);
-        return ts.setTextRange(ts.createCall(ts.getHelperName("__asyncValues"), undefined, [expression]), location);
+        return ts.setTextRange(ts.createCall(ts.getHelperName("__asyncValues"), 
+        /*typeArguments*/ undefined, [expression]), location);
     }
 })(ts || (ts = {}));
+/*@internal*/
 var ts;
 (function (ts) {
     function transformJsx(context) {
         var compilerOptions = context.getCompilerOptions();
         var currentSourceFile;
         return ts.chainBundle(transformSourceFile);
+        /**
+         * Transform JSX-specific syntax in a SourceFile.
+         *
+         * @param node A SourceFile node.
+         */
         function transformSourceFile(node) {
             if (node.isDeclarationFile) {
                 return node;
@@ -53136,7 +65170,7 @@ var ts;
             return visited;
         }
         function visitor(node) {
-            if (node.transformFlags & 4) {
+            if (node.transformFlags & 4 /* ContainsJsx */) {
                 return visitorWorker(node);
             }
             else {
@@ -53145,13 +65179,13 @@ var ts;
         }
         function visitorWorker(node) {
             switch (node.kind) {
-                case 255:
-                    return visitJsxElement(node, false);
-                case 256:
-                    return visitJsxSelfClosingElement(node, false);
-                case 259:
-                    return visitJsxFragment(node, false);
-                case 265:
+                case 255 /* JsxElement */:
+                    return visitJsxElement(node, /*isChild*/ false);
+                case 256 /* JsxSelfClosingElement */:
+                    return visitJsxSelfClosingElement(node, /*isChild*/ false);
+                case 259 /* JsxFragment */:
+                    return visitJsxFragment(node, /*isChild*/ false);
+                case 265 /* JsxExpression */:
                     return visitJsxExpression(node);
                 default:
                     return ts.visitEachChild(node, visitor, context);
@@ -53159,56 +65193,65 @@ var ts;
         }
         function transformJsxChildToExpression(node) {
             switch (node.kind) {
-                case 10:
+                case 10 /* JsxText */:
                     return visitJsxText(node);
-                case 265:
+                case 265 /* JsxExpression */:
                     return visitJsxExpression(node);
-                case 255:
-                    return visitJsxElement(node, true);
-                case 256:
-                    return visitJsxSelfClosingElement(node, true);
-                case 259:
-                    return visitJsxFragment(node, true);
+                case 255 /* JsxElement */:
+                    return visitJsxElement(node, /*isChild*/ true);
+                case 256 /* JsxSelfClosingElement */:
+                    return visitJsxSelfClosingElement(node, /*isChild*/ true);
+                case 259 /* JsxFragment */:
+                    return visitJsxFragment(node, /*isChild*/ true);
                 default:
                     return ts.Debug.failBadSyntaxKind(node);
             }
         }
         function visitJsxElement(node, isChild) {
-            return visitJsxOpeningLikeElement(node.openingElement, node.children, isChild, node);
+            return visitJsxOpeningLikeElement(node.openingElement, node.children, isChild, /*location*/ node);
         }
         function visitJsxSelfClosingElement(node, isChild) {
-            return visitJsxOpeningLikeElement(node, undefined, isChild, node);
+            return visitJsxOpeningLikeElement(node, /*children*/ undefined, isChild, /*location*/ node);
         }
         function visitJsxFragment(node, isChild) {
-            return visitJsxOpeningFragment(node.openingFragment, node.children, isChild, node);
+            return visitJsxOpeningFragment(node.openingFragment, node.children, isChild, /*location*/ node);
         }
         function visitJsxOpeningLikeElement(node, children, isChild, location) {
             var tagName = getTagName(node);
             var objectProperties;
             var attrs = node.attributes.properties;
             if (attrs.length === 0) {
+                // When there are no attributes, React wants "null"
                 objectProperties = ts.createNull();
             }
             else {
+                // Map spans of JsxAttribute nodes into object literals and spans
+                // of JsxSpreadAttribute nodes into expressions.
                 var segments = ts.flatten(ts.spanMap(attrs, ts.isJsxSpreadAttribute, function (attrs, isSpread) { return isSpread
                     ? ts.map(attrs, transformJsxSpreadAttributeToExpression)
                     : ts.createObjectLiteral(ts.map(attrs, transformJsxAttributeToObjectLiteralElement)); }));
                 if (ts.isJsxSpreadAttribute(attrs[0])) {
+                    // We must always emit at least one object literal before a spread
+                    // argument.
                     segments.unshift(ts.createObjectLiteral());
                 }
+                // Either emit one big object literal (no spread attribs), or
+                // a call to the __assign helper.
                 objectProperties = ts.singleOrUndefined(segments);
                 if (!objectProperties) {
                     objectProperties = ts.createAssignHelper(context, segments);
                 }
             }
-            var element = ts.createExpressionForJsxElement(context.getEmitResolver().getJsxFactoryEntity(currentSourceFile), compilerOptions.reactNamespace, tagName, objectProperties, ts.mapDefined(children, transformJsxChildToExpression), node, location);
+            var element = ts.createExpressionForJsxElement(context.getEmitResolver().getJsxFactoryEntity(currentSourceFile), compilerOptions.reactNamespace, // TODO: GH#18217
+            tagName, objectProperties, ts.mapDefined(children, transformJsxChildToExpression), node, location);
             if (isChild) {
                 ts.startOnNewLine(element);
             }
             return element;
         }
         function visitJsxOpeningFragment(node, children, isChild, location) {
-            var element = ts.createExpressionForJsxFragment(context.getEmitResolver().getJsxFactoryEntity(currentSourceFile), compilerOptions.reactNamespace, ts.mapDefined(children, transformJsxChildToExpression), node, location);
+            var element = ts.createExpressionForJsxFragment(context.getEmitResolver().getJsxFactoryEntity(currentSourceFile), compilerOptions.reactNamespace, // TODO: GH#18217
+            ts.mapDefined(children, transformJsxChildToExpression), node, location);
             if (isChild) {
                 ts.startOnNewLine(element);
             }
@@ -53226,12 +65269,14 @@ var ts;
             if (node === undefined) {
                 return ts.createTrue();
             }
-            else if (node.kind === 9) {
+            else if (node.kind === 9 /* StringLiteral */) {
+                // Always recreate the literal to escape any escape sequences or newlines which may be in the original jsx string and which
+                // Need to be escaped to be handled correctly in a normal string
                 var literal = ts.createLiteral(tryDecodeEntities(node.text) || node.text);
                 literal.singleQuote = node.singleQuote !== undefined ? node.singleQuote : !ts.isStringDoubleQuoted(node, currentSourceFile);
                 return ts.setTextRange(literal, node);
             }
-            else if (node.kind === 265) {
+            else if (node.kind === 265 /* JsxExpression */) {
                 if (node.expression === undefined) {
                     return ts.createTrue();
                 }
@@ -53242,19 +65287,43 @@ var ts;
             }
         }
         function visitJsxText(node) {
-            var fixed = fixupWhitespaceAndDecodeEntities(ts.getTextOfNode(node, true));
+            var fixed = fixupWhitespaceAndDecodeEntities(ts.getTextOfNode(node, /*includeTrivia*/ true));
             return fixed === undefined ? undefined : ts.createLiteral(fixed);
         }
+        /**
+         * JSX trims whitespace at the end and beginning of lines, except that the
+         * start/end of a tag is considered a start/end of a line only if that line is
+         * on the same line as the closing tag. See examples in
+         * tests/cases/conformance/jsx/tsxReactEmitWhitespace.tsx
+         * See also https://www.w3.org/TR/html4/struct/text.html#h-9.1 and https://www.w3.org/TR/CSS2/text.html#white-space-model
+         *
+         * An equivalent algorithm would be:
+         * - If there is only one line, return it.
+         * - If there is only whitespace (but multiple lines), return `undefined`.
+         * - Split the text into lines.
+         * - 'trimRight' the first line, 'trimLeft' the last line, 'trim' middle lines.
+         * - Decode entities on each line (individually).
+         * - Remove empty lines and join the rest with " ".
+         */
         function fixupWhitespaceAndDecodeEntities(text) {
             var acc;
+            // First non-whitespace character on this line.
             var firstNonWhitespace = 0;
+            // Last non-whitespace character on this line.
             var lastNonWhitespace = -1;
+            // These initial values are special because the first line is:
+            // firstNonWhitespace = 0 to indicate that we want leading whitsepace,
+            // but lastNonWhitespace = -1 as a special flag to indicate that we *don't* include the line if it's all whitespace.
             for (var i = 0; i < text.length; i++) {
                 var c = text.charCodeAt(i);
                 if (ts.isLineBreak(c)) {
+                    // If we've seen any non-whitespace characters on this line, add the 'trim' of the line.
+                    // (lastNonWhitespace === -1 is a special flag to detect whether the first line is all whitespace.)
                     if (firstNonWhitespace !== -1 && lastNonWhitespace !== -1) {
                         acc = addLineOfJsxText(acc, text.substr(firstNonWhitespace, lastNonWhitespace - firstNonWhitespace + 1));
                     }
+                    // Reset firstNonWhitespace for the next line.
+                    // Don't bother to reset lastNonWhitespace because we ignore it if firstNonWhitespace = -1.
                     firstNonWhitespace = -1;
                 }
                 else if (!ts.isWhiteSpaceSingleLine(c)) {
@@ -53265,13 +65334,21 @@ var ts;
                 }
             }
             return firstNonWhitespace !== -1
+                // Last line had a non-whitespace character. Emit the 'trimLeft', meaning keep trailing whitespace.
                 ? addLineOfJsxText(acc, text.substr(firstNonWhitespace))
+                // Last line was all whitespace, so ignore it
                 : acc;
         }
         function addLineOfJsxText(acc, trimmedLine) {
+            // We do not escape the string here as that is handled by the printer
+            // when it emits the literal. We do, however, need to decode JSX entities.
             var decoded = decodeEntities(trimmedLine);
             return acc === undefined ? decoded : acc + " " + decoded;
         }
+        /**
+         * Replace entities like "&nbsp;", "&#123;", and "&#xDEADBEEF;" with the characters they encode.
+         * See https://en.wikipedia.org/wiki/List_of_XML_and_HTML_character_entity_references
+         */
         function decodeEntities(text) {
             return text.replace(/&((#((\d+)|x([\da-fA-F]+)))|(\w+));/g, function (match, _all, _number, _digits, decimal, hex, word) {
                 if (decimal) {
@@ -53282,16 +65359,18 @@ var ts;
                 }
                 else {
                     var ch = entities.get(word);
+                    // If this is not a valid entity, then just use `match` (replace it with itself, i.e. don't replace)
                     return ch ? String.fromCharCode(ch) : match;
                 }
             });
         }
+        /** Like `decodeEntities` but returns `undefined` if there were no entities to decode. */
         function tryDecodeEntities(text) {
             var decoded = decodeEntities(text);
             return decoded === text ? undefined : decoded;
         }
         function getTagName(node) {
-            if (node.kind === 255) {
+            if (node.kind === 255 /* JsxElement */) {
                 return getTagName(node.openingElement);
             }
             else {
@@ -53304,6 +65383,11 @@ var ts;
                 }
             }
         }
+        /**
+         * Emit an attribute name, which is quoted if it needs to be quoted. Because
+         * these emit into an object literal property name, we don't need to be worried
+         * about keywords, just non-identifier characters
+         */
         function getAttributeName(node) {
             var name = node.name;
             var text = ts.idText(name);
@@ -53575,6 +65659,7 @@ var ts;
         diams: 0x2666
     });
 })(ts || (ts = {}));
+/*@internal*/
 var ts;
 (function (ts) {
     function transformES2016(context) {
@@ -53587,11 +65672,11 @@ var ts;
             return ts.visitEachChild(node, visitor, context);
         }
         function visitor(node) {
-            if ((node.transformFlags & 32) === 0) {
+            if ((node.transformFlags & 32 /* ContainsES2016 */) === 0) {
                 return node;
             }
             switch (node.kind) {
-                case 200:
+                case 200 /* BinaryExpression */:
                     return visitBinaryExpression(node);
                 default:
                     return ts.visitEachChild(node, visitor, context);
@@ -53599,9 +65684,9 @@ var ts;
         }
         function visitBinaryExpression(node) {
             switch (node.operatorToken.kind) {
-                case 62:
+                case 62 /* AsteriskAsteriskEqualsToken */:
                     return visitExponentiationAssignmentExpression(node);
-                case 40:
+                case 40 /* AsteriskAsteriskToken */:
                     return visitExponentiationExpression(node);
                 default:
                     return ts.visitEachChild(node, visitor, context);
@@ -53613,35 +65698,42 @@ var ts;
             var left = ts.visitNode(node.left, visitor, ts.isExpression);
             var right = ts.visitNode(node.right, visitor, ts.isExpression);
             if (ts.isElementAccessExpression(left)) {
+                // Transforms `a[x] **= b` into `(_a = a)[_x = x] = Math.pow(_a[_x], b)`
                 var expressionTemp = ts.createTempVariable(hoistVariableDeclaration);
                 var argumentExpressionTemp = ts.createTempVariable(hoistVariableDeclaration);
                 target = ts.setTextRange(ts.createElementAccess(ts.setTextRange(ts.createAssignment(expressionTemp, left.expression), left.expression), ts.setTextRange(ts.createAssignment(argumentExpressionTemp, left.argumentExpression), left.argumentExpression)), left);
                 value = ts.setTextRange(ts.createElementAccess(expressionTemp, argumentExpressionTemp), left);
             }
             else if (ts.isPropertyAccessExpression(left)) {
+                // Transforms `a.x **= b` into `(_a = a).x = Math.pow(_a.x, b)`
                 var expressionTemp = ts.createTempVariable(hoistVariableDeclaration);
                 target = ts.setTextRange(ts.createPropertyAccess(ts.setTextRange(ts.createAssignment(expressionTemp, left.expression), left.expression), left.name), left);
                 value = ts.setTextRange(ts.createPropertyAccess(expressionTemp, left.name), left);
             }
             else {
+                // Transforms `a **= b` into `a = Math.pow(a, b)`
                 target = left;
                 value = left;
             }
-            return ts.setTextRange(ts.createAssignment(target, ts.createMathPow(value, right, node)), node);
+            return ts.setTextRange(ts.createAssignment(target, ts.createMathPow(value, right, /*location*/ node)), node);
         }
         function visitExponentiationExpression(node) {
+            // Transforms `a ** b` into `Math.pow(a, b)`
             var left = ts.visitNode(node.left, visitor, ts.isExpression);
             var right = ts.visitNode(node.right, visitor, ts.isExpression);
-            return ts.createMathPow(left, right, node);
+            return ts.createMathPow(left, right, /*location*/ node);
         }
     }
     ts.transformES2016 = transformES2016;
 })(ts || (ts = {}));
+/*@internal*/
 var ts;
 (function (ts) {
     var ES2015SubstitutionFlags;
     (function (ES2015SubstitutionFlags) {
+        /** Enables substitutions for captured `this` */
         ES2015SubstitutionFlags[ES2015SubstitutionFlags["CapturedThis"] = 1] = "CapturedThis";
+        /** Enables substitutions for block-scoped bindings. */
         ES2015SubstitutionFlags[ES2015SubstitutionFlags["BlockScopedBindings"] = 2] = "BlockScopedBindings";
     })(ES2015SubstitutionFlags || (ES2015SubstitutionFlags = {}));
     var CopyDirection;
@@ -53657,13 +65749,35 @@ var ts;
     })(Jump || (Jump = {}));
     var SuperCaptureResult;
     (function (SuperCaptureResult) {
+        /**
+         * A capture may have been added for calls to 'super', but
+         * the caller should emit subsequent statements normally.
+         */
         SuperCaptureResult[SuperCaptureResult["NoReplacement"] = 0] = "NoReplacement";
+        /**
+         * A call to 'super()' got replaced with a capturing statement like:
+         *
+         *  var _this = _super.call(...) || this;
+         *
+         * Callers should skip the current statement.
+         */
         SuperCaptureResult[SuperCaptureResult["ReplaceSuperCapture"] = 1] = "ReplaceSuperCapture";
+        /**
+         * A call to 'super()' got replaced with a capturing statement like:
+         *
+         *  return _super.call(...) || this;
+         *
+         * Callers should skip the current statement and avoid any returns of '_this'.
+         */
         SuperCaptureResult[SuperCaptureResult["ReplaceWithReturn"] = 2] = "ReplaceWithReturn";
     })(SuperCaptureResult || (SuperCaptureResult = {}));
+    // Facts we track as we traverse the tree
     var HierarchyFacts;
     (function (HierarchyFacts) {
         HierarchyFacts[HierarchyFacts["None"] = 0] = "None";
+        //
+        // Ancestor facts
+        //
         HierarchyFacts[HierarchyFacts["Function"] = 1] = "Function";
         HierarchyFacts[HierarchyFacts["ArrowFunction"] = 2] = "ArrowFunction";
         HierarchyFacts[HierarchyFacts["AsyncFunctionBody"] = 4] = "AsyncFunctionBody";
@@ -53678,33 +65792,58 @@ var ts;
         HierarchyFacts[HierarchyFacts["ForInOrForOfStatement"] = 2048] = "ForInOrForOfStatement";
         HierarchyFacts[HierarchyFacts["ConstructorWithCapturedSuper"] = 4096] = "ConstructorWithCapturedSuper";
         HierarchyFacts[HierarchyFacts["ComputedPropertyName"] = 8192] = "ComputedPropertyName";
+        // NOTE: do not add more ancestor flags without also updating AncestorFactsMask below.
+        //
+        // Ancestor masks
+        //
         HierarchyFacts[HierarchyFacts["AncestorFactsMask"] = 16383] = "AncestorFactsMask";
+        // We are always in *some* kind of block scope, but only specific block-scope containers are
+        // top-level or Blocks.
         HierarchyFacts[HierarchyFacts["BlockScopeIncludes"] = 0] = "BlockScopeIncludes";
         HierarchyFacts[HierarchyFacts["BlockScopeExcludes"] = 4032] = "BlockScopeExcludes";
+        // A source file is a top-level block scope.
         HierarchyFacts[HierarchyFacts["SourceFileIncludes"] = 64] = "SourceFileIncludes";
         HierarchyFacts[HierarchyFacts["SourceFileExcludes"] = 3968] = "SourceFileExcludes";
+        // Functions, methods, and accessors are both new lexical scopes and new block scopes.
         HierarchyFacts[HierarchyFacts["FunctionIncludes"] = 65] = "FunctionIncludes";
         HierarchyFacts[HierarchyFacts["FunctionExcludes"] = 16286] = "FunctionExcludes";
         HierarchyFacts[HierarchyFacts["AsyncFunctionBodyIncludes"] = 69] = "AsyncFunctionBodyIncludes";
         HierarchyFacts[HierarchyFacts["AsyncFunctionBodyExcludes"] = 16278] = "AsyncFunctionBodyExcludes";
+        // Arrow functions are lexically scoped to their container, but are new block scopes.
         HierarchyFacts[HierarchyFacts["ArrowFunctionIncludes"] = 66] = "ArrowFunctionIncludes";
         HierarchyFacts[HierarchyFacts["ArrowFunctionExcludes"] = 16256] = "ArrowFunctionExcludes";
+        // Constructors are both new lexical scopes and new block scopes. Constructors are also
+        // always considered non-static members of a class.
         HierarchyFacts[HierarchyFacts["ConstructorIncludes"] = 73] = "ConstructorIncludes";
         HierarchyFacts[HierarchyFacts["ConstructorExcludes"] = 16278] = "ConstructorExcludes";
+        // 'do' and 'while' statements are not block scopes. We track that the subtree is contained
+        // within an IterationStatement to indicate whether the embedded statement is an
+        // IterationStatementBlock.
         HierarchyFacts[HierarchyFacts["DoOrWhileStatementIncludes"] = 256] = "DoOrWhileStatementIncludes";
         HierarchyFacts[HierarchyFacts["DoOrWhileStatementExcludes"] = 0] = "DoOrWhileStatementExcludes";
+        // 'for' statements are new block scopes and have special handling for 'let' declarations.
         HierarchyFacts[HierarchyFacts["ForStatementIncludes"] = 1280] = "ForStatementIncludes";
         HierarchyFacts[HierarchyFacts["ForStatementExcludes"] = 3008] = "ForStatementExcludes";
+        // 'for-in' and 'for-of' statements are new block scopes and have special handling for
+        // 'let' declarations.
         HierarchyFacts[HierarchyFacts["ForInOrForOfStatementIncludes"] = 2304] = "ForInOrForOfStatementIncludes";
         HierarchyFacts[HierarchyFacts["ForInOrForOfStatementExcludes"] = 1984] = "ForInOrForOfStatementExcludes";
+        // Blocks (other than function bodies) are new block scopes.
         HierarchyFacts[HierarchyFacts["BlockIncludes"] = 128] = "BlockIncludes";
         HierarchyFacts[HierarchyFacts["BlockExcludes"] = 3904] = "BlockExcludes";
         HierarchyFacts[HierarchyFacts["IterationStatementBlockIncludes"] = 512] = "IterationStatementBlockIncludes";
         HierarchyFacts[HierarchyFacts["IterationStatementBlockExcludes"] = 4032] = "IterationStatementBlockExcludes";
+        // Computed property names track subtree flags differently than their containing members.
         HierarchyFacts[HierarchyFacts["ComputedPropertyNameIncludes"] = 8192] = "ComputedPropertyNameIncludes";
         HierarchyFacts[HierarchyFacts["ComputedPropertyNameExcludes"] = 0] = "ComputedPropertyNameExcludes";
+        //
+        // Subtree facts
+        //
         HierarchyFacts[HierarchyFacts["NewTarget"] = 16384] = "NewTarget";
         HierarchyFacts[HierarchyFacts["NewTargetInComputedPropertyName"] = 32768] = "NewTargetInComputedPropertyName";
+        //
+        // Subtree masks
+        //
         HierarchyFacts[HierarchyFacts["SubtreeFactsMask"] = -16384] = "SubtreeFactsMask";
         HierarchyFacts[HierarchyFacts["PropagateNewTargetMask"] = 49152] = "PropagateNewTargetMask";
     })(HierarchyFacts || (HierarchyFacts = {}));
@@ -53723,7 +65862,15 @@ var ts;
         function recordTaggedTemplateString(temp) {
             taggedTemplateStringDeclarations = ts.append(taggedTemplateStringDeclarations, ts.createVariableDeclaration(temp));
         }
+        /**
+         * Used to track if we are emitting body of the converted loop
+         */
         var convertedLoopState;
+        /**
+         * Keeps track of whether substitutions have been enabled for specific cases.
+         * They are persisted between each SourceFile transformation and should not
+         * be reset.
+         */
         var enabledSubstitutions;
         return ts.chainBundle(transformSourceFile);
         function transformSourceFile(node) {
@@ -53737,28 +65884,40 @@ var ts;
             currentSourceFile = undefined;
             currentText = undefined;
             taggedTemplateStringDeclarations = undefined;
-            hierarchyFacts = 0;
+            hierarchyFacts = 0 /* None */;
             return visited;
         }
+        /**
+         * Sets the `HierarchyFacts` for this node prior to visiting this node's subtree, returning the facts set prior to modification.
+         * @param excludeFacts The existing `HierarchyFacts` to reset before visiting the subtree.
+         * @param includeFacts The new `HierarchyFacts` to set before visiting the subtree.
+         */
         function enterSubtree(excludeFacts, includeFacts) {
             var ancestorFacts = hierarchyFacts;
-            hierarchyFacts = (hierarchyFacts & ~excludeFacts | includeFacts) & 16383;
+            hierarchyFacts = (hierarchyFacts & ~excludeFacts | includeFacts) & 16383 /* AncestorFactsMask */;
             return ancestorFacts;
         }
+        /**
+         * Restores the `HierarchyFacts` for this node's ancestor after visiting this node's
+         * subtree, propagating specific facts from the subtree.
+         * @param ancestorFacts The `HierarchyFacts` of the ancestor to restore after visiting the subtree.
+         * @param excludeFacts The existing `HierarchyFacts` of the subtree that should not be propagated.
+         * @param includeFacts The new `HierarchyFacts` of the subtree that should be propagated.
+         */
         function exitSubtree(ancestorFacts, excludeFacts, includeFacts) {
-            hierarchyFacts = (hierarchyFacts & ~excludeFacts | includeFacts) & -16384 | ancestorFacts;
+            hierarchyFacts = (hierarchyFacts & ~excludeFacts | includeFacts) & -16384 /* SubtreeFactsMask */ | ancestorFacts;
         }
         function isReturnVoidStatementInConstructorWithCapturedSuper(node) {
-            return (hierarchyFacts & 4096) !== 0
-                && node.kind === 225
+            return (hierarchyFacts & 4096 /* ConstructorWithCapturedSuper */) !== 0
+                && node.kind === 225 /* ReturnStatement */
                 && !node.expression;
         }
         function shouldVisitNode(node) {
-            return (node.transformFlags & 128) !== 0
+            return (node.transformFlags & 128 /* ContainsES2015 */) !== 0
                 || convertedLoopState !== undefined
-                || (hierarchyFacts & 4096 && (ts.isStatement(node) || (node.kind === 213)))
-                || (ts.isIterationStatement(node, false) && shouldConvertIterationStatementBody(node))
-                || (ts.getEmitFlags(node) & 33554432) !== 0;
+                || (hierarchyFacts & 4096 /* ConstructorWithCapturedSuper */ && (ts.isStatement(node) || (node.kind === 213 /* Block */)))
+                || (ts.isIterationStatement(node, /*lookInLabeledStatements*/ false) && shouldConvertIterationStatementBody(node))
+                || (ts.getEmitFlags(node) & 33554432 /* TypeScriptClassWrapper */) !== 0;
         }
         function visitor(node) {
             if (shouldVisitNode(node)) {
@@ -53770,133 +65929,134 @@ var ts;
         }
         function functionBodyVisitor(node) {
             if (shouldVisitNode(node)) {
-                return visitBlock(node, true);
+                return visitBlock(node, /*isFunctionBody*/ true);
             }
             return node;
         }
         function callExpressionVisitor(node) {
-            if (node.kind === 97) {
-                return visitSuperKeyword(true);
+            if (node.kind === 97 /* SuperKeyword */) {
+                return visitSuperKeyword(/*isExpressionOfCall*/ true);
             }
             return visitor(node);
         }
         function visitJavaScript(node) {
             switch (node.kind) {
-                case 115:
-                    return undefined;
-                case 235:
+                case 115 /* StaticKeyword */:
+                    return undefined; // elide static keyword
+                case 235 /* ClassDeclaration */:
                     return visitClassDeclaration(node);
-                case 205:
+                case 205 /* ClassExpression */:
                     return visitClassExpression(node);
-                case 149:
+                case 149 /* Parameter */:
                     return visitParameter(node);
-                case 234:
+                case 234 /* FunctionDeclaration */:
                     return visitFunctionDeclaration(node);
-                case 193:
+                case 193 /* ArrowFunction */:
                     return visitArrowFunction(node);
-                case 192:
+                case 192 /* FunctionExpression */:
                     return visitFunctionExpression(node);
-                case 232:
+                case 232 /* VariableDeclaration */:
                     return visitVariableDeclaration(node);
-                case 71:
+                case 71 /* Identifier */:
                     return visitIdentifier(node);
-                case 233:
+                case 233 /* VariableDeclarationList */:
                     return visitVariableDeclarationList(node);
-                case 227:
+                case 227 /* SwitchStatement */:
                     return visitSwitchStatement(node);
-                case 241:
+                case 241 /* CaseBlock */:
                     return visitCaseBlock(node);
-                case 213:
-                    return visitBlock(node, false);
-                case 224:
-                case 223:
+                case 213 /* Block */:
+                    return visitBlock(node, /*isFunctionBody*/ false);
+                case 224 /* BreakStatement */:
+                case 223 /* ContinueStatement */:
                     return visitBreakOrContinueStatement(node);
-                case 228:
+                case 228 /* LabeledStatement */:
                     return visitLabeledStatement(node);
-                case 218:
-                case 219:
-                    return visitDoOrWhileStatement(node, undefined);
-                case 220:
-                    return visitForStatement(node, undefined);
-                case 221:
-                    return visitForInStatement(node, undefined);
-                case 222:
-                    return visitForOfStatement(node, undefined);
-                case 216:
+                case 218 /* DoStatement */:
+                case 219 /* WhileStatement */:
+                    return visitDoOrWhileStatement(node, /*outermostLabeledStatement*/ undefined);
+                case 220 /* ForStatement */:
+                    return visitForStatement(node, /*outermostLabeledStatement*/ undefined);
+                case 221 /* ForInStatement */:
+                    return visitForInStatement(node, /*outermostLabeledStatement*/ undefined);
+                case 222 /* ForOfStatement */:
+                    return visitForOfStatement(node, /*outermostLabeledStatement*/ undefined);
+                case 216 /* ExpressionStatement */:
                     return visitExpressionStatement(node);
-                case 184:
+                case 184 /* ObjectLiteralExpression */:
                     return visitObjectLiteralExpression(node);
-                case 269:
+                case 269 /* CatchClause */:
                     return visitCatchClause(node);
-                case 271:
+                case 271 /* ShorthandPropertyAssignment */:
                     return visitShorthandPropertyAssignment(node);
-                case 147:
+                case 147 /* ComputedPropertyName */:
                     return visitComputedPropertyName(node);
-                case 183:
+                case 183 /* ArrayLiteralExpression */:
                     return visitArrayLiteralExpression(node);
-                case 187:
+                case 187 /* CallExpression */:
                     return visitCallExpression(node);
-                case 188:
+                case 188 /* NewExpression */:
                     return visitNewExpression(node);
-                case 191:
-                    return visitParenthesizedExpression(node, true);
-                case 200:
-                    return visitBinaryExpression(node, true);
-                case 13:
-                case 14:
-                case 15:
-                case 16:
+                case 191 /* ParenthesizedExpression */:
+                    return visitParenthesizedExpression(node, /*needsDestructuringValue*/ true);
+                case 200 /* BinaryExpression */:
+                    return visitBinaryExpression(node, /*needsDestructuringValue*/ true);
+                case 13 /* NoSubstitutionTemplateLiteral */:
+                case 14 /* TemplateHead */:
+                case 15 /* TemplateMiddle */:
+                case 16 /* TemplateTail */:
                     return visitTemplateLiteral(node);
-                case 9:
+                case 9 /* StringLiteral */:
                     return visitStringLiteral(node);
-                case 8:
+                case 8 /* NumericLiteral */:
                     return visitNumericLiteral(node);
-                case 189:
+                case 189 /* TaggedTemplateExpression */:
                     return visitTaggedTemplateExpression(node);
-                case 202:
+                case 202 /* TemplateExpression */:
                     return visitTemplateExpression(node);
-                case 203:
+                case 203 /* YieldExpression */:
                     return visitYieldExpression(node);
-                case 204:
+                case 204 /* SpreadElement */:
                     return visitSpreadElement(node);
-                case 97:
-                    return visitSuperKeyword(false);
-                case 99:
+                case 97 /* SuperKeyword */:
+                    return visitSuperKeyword(/*isExpressionOfCall*/ false);
+                case 99 /* ThisKeyword */:
                     return visitThisKeyword(node);
-                case 210:
+                case 210 /* MetaProperty */:
                     return visitMetaProperty(node);
-                case 154:
+                case 154 /* MethodDeclaration */:
                     return visitMethodDeclaration(node);
-                case 156:
-                case 157:
+                case 156 /* GetAccessor */:
+                case 157 /* SetAccessor */:
                     return visitAccessorDeclaration(node);
-                case 214:
+                case 214 /* VariableStatement */:
                     return visitVariableStatement(node);
-                case 225:
+                case 225 /* ReturnStatement */:
                     return visitReturnStatement(node);
                 default:
                     return ts.visitEachChild(node, visitor, context);
             }
         }
         function visitSourceFile(node) {
-            var ancestorFacts = enterSubtree(3968, 64);
+            var ancestorFacts = enterSubtree(3968 /* SourceFileExcludes */, 64 /* SourceFileIncludes */);
             var statements = [];
             startLexicalEnvironment();
-            var statementOffset = ts.addStandardPrologue(statements, node.statements, false);
+            var statementOffset = ts.addStandardPrologue(statements, node.statements, /*ensureUseStrict*/ false);
             addCaptureThisForNodeIfNeeded(statements, node);
             statementOffset = ts.addCustomPrologue(statements, node.statements, statementOffset, visitor);
             ts.addRange(statements, ts.visitNodes(node.statements, visitor, ts.isStatement, statementOffset));
             if (taggedTemplateStringDeclarations) {
-                statements.push(ts.createVariableStatement(undefined, ts.createVariableDeclarationList(taggedTemplateStringDeclarations)));
+                statements.push(ts.createVariableStatement(/*modifiers*/ undefined, ts.createVariableDeclarationList(taggedTemplateStringDeclarations)));
             }
             ts.prependStatements(statements, endLexicalEnvironment());
-            exitSubtree(ancestorFacts, 0, 0);
+            exitSubtree(ancestorFacts, 0 /* None */, 0 /* None */);
             return ts.updateSourceFileNode(node, ts.setTextRange(ts.createNodeArray(statements), node.statements));
         }
         function visitSwitchStatement(node) {
             if (convertedLoopState !== undefined) {
                 var savedAllowedNonLabeledJumps = convertedLoopState.allowedNonLabeledJumps;
-                convertedLoopState.allowedNonLabeledJumps |= 2;
+                // for switch statement allow only non-labeled break
+                convertedLoopState.allowedNonLabeledJumps |= 2 /* Break */;
                 var result = ts.visitEachChild(node, visitor, context);
                 convertedLoopState.allowedNonLabeledJumps = savedAllowedNonLabeledJumps;
                 return result;
@@ -53904,9 +66064,9 @@ var ts;
             return ts.visitEachChild(node, visitor, context);
         }
         function visitCaseBlock(node) {
-            var ancestorFacts = enterSubtree(4032, 0);
+            var ancestorFacts = enterSubtree(4032 /* BlockScopeExcludes */, 0 /* BlockScopeIncludes */);
             var updated = ts.visitEachChild(node, visitor, context);
-            exitSubtree(ancestorFacts, 0, 0);
+            exitSubtree(ancestorFacts, 0 /* None */, 0 /* None */);
             return updated;
         }
         function returnCapturedThis(node) {
@@ -53914,7 +66074,7 @@ var ts;
         }
         function visitReturnStatement(node) {
             if (convertedLoopState) {
-                convertedLoopState.nonLocalJumps |= 8;
+                convertedLoopState.nonLocalJumps |= 8 /* Return */;
                 if (isReturnVoidStatementInConstructorWithCapturedSuper(node)) {
                     node = returnCapturedThis(node);
                 }
@@ -53931,7 +66091,8 @@ var ts;
         }
         function visitThisKeyword(node) {
             if (convertedLoopState) {
-                if (hierarchyFacts & 2) {
+                if (hierarchyFacts & 2 /* ArrowFunction */) {
+                    // if the enclosing function is an ArrowFunction then we use the captured 'this' keyword.
                     convertedLoopState.containsLexicalThis = true;
                     return node;
                 }
@@ -53953,30 +66114,35 @@ var ts;
         }
         function visitBreakOrContinueStatement(node) {
             if (convertedLoopState) {
-                var jump = node.kind === 224 ? 2 : 4;
+                // check if we can emit break/continue as is
+                // it is possible if either
+                //   - break/continue is labeled and label is located inside the converted loop
+                //   - break/continue is non-labeled and located in non-converted loop/switch statement
+                var jump = node.kind === 224 /* BreakStatement */ ? 2 /* Break */ : 4 /* Continue */;
                 var canUseBreakOrContinue = (node.label && convertedLoopState.labels && convertedLoopState.labels.get(ts.idText(node.label))) ||
                     (!node.label && (convertedLoopState.allowedNonLabeledJumps & jump));
                 if (!canUseBreakOrContinue) {
                     var labelMarker = void 0;
                     var label = node.label;
                     if (!label) {
-                        if (node.kind === 224) {
-                            convertedLoopState.nonLocalJumps |= 2;
+                        if (node.kind === 224 /* BreakStatement */) {
+                            convertedLoopState.nonLocalJumps |= 2 /* Break */;
                             labelMarker = "break";
                         }
                         else {
-                            convertedLoopState.nonLocalJumps |= 4;
+                            convertedLoopState.nonLocalJumps |= 4 /* Continue */;
+                            // note: return value is emitted only to simplify debugging, call to converted loop body does not do any dispatching on it.
                             labelMarker = "continue";
                         }
                     }
                     else {
-                        if (node.kind === 224) {
+                        if (node.kind === 224 /* BreakStatement */) {
                             labelMarker = "break-" + label.escapedText;
-                            setLabeledJump(convertedLoopState, true, ts.idText(label), labelMarker);
+                            setLabeledJump(convertedLoopState, /*isBreak*/ true, ts.idText(label), labelMarker);
                         }
                         else {
                             labelMarker = "continue-" + label.escapedText;
-                            setLabeledJump(convertedLoopState, false, ts.idText(label), labelMarker);
+                            setLabeledJump(convertedLoopState, /*isBreak*/ false, ts.idText(label), labelMarker);
                         }
                     }
                     var returnExpression = ts.createLiteral(labelMarker);
@@ -53984,167 +66150,305 @@ var ts;
                         var outParams = convertedLoopState.loopOutParameters;
                         var expr = void 0;
                         for (var i = 0; i < outParams.length; i++) {
-                            var copyExpr = copyOutParameter(outParams[i], 1);
+                            var copyExpr = copyOutParameter(outParams[i], 1 /* ToOutParameter */);
                             if (i === 0) {
                                 expr = copyExpr;
                             }
                             else {
-                                expr = ts.createBinary(expr, 26, copyExpr);
+                                expr = ts.createBinary(expr, 26 /* CommaToken */, copyExpr);
                             }
                         }
-                        returnExpression = ts.createBinary(expr, 26, returnExpression);
+                        returnExpression = ts.createBinary(expr, 26 /* CommaToken */, returnExpression);
                     }
                     return ts.createReturn(returnExpression);
                 }
             }
             return ts.visitEachChild(node, visitor, context);
         }
+        /**
+         * Visits a ClassDeclaration and transforms it into a variable statement.
+         *
+         * @param node A ClassDeclaration node.
+         */
         function visitClassDeclaration(node) {
-            var variable = ts.createVariableDeclaration(ts.getLocalName(node, true), undefined, transformClassLikeDeclarationToExpression(node));
+            // [source]
+            //      class C { }
+            //
+            // [output]
+            //      var C = (function () {
+            //          function C() {
+            //          }
+            //          return C;
+            //      }());
+            var variable = ts.createVariableDeclaration(ts.getLocalName(node, /*allowComments*/ true), 
+            /*type*/ undefined, transformClassLikeDeclarationToExpression(node));
             ts.setOriginalNode(variable, node);
             var statements = [];
-            var statement = ts.createVariableStatement(undefined, ts.createVariableDeclarationList([variable]));
+            var statement = ts.createVariableStatement(/*modifiers*/ undefined, ts.createVariableDeclarationList([variable]));
             ts.setOriginalNode(statement, node);
             ts.setTextRange(statement, node);
             ts.startOnNewLine(statement);
             statements.push(statement);
-            if (ts.hasModifier(node, 1)) {
-                var exportStatement = ts.hasModifier(node, 512)
+            // Add an `export default` statement for default exports (for `--target es5 --module es6`)
+            if (ts.hasModifier(node, 1 /* Export */)) {
+                var exportStatement = ts.hasModifier(node, 512 /* Default */)
                     ? ts.createExportDefault(ts.getLocalName(node))
                     : ts.createExternalModuleExport(ts.getLocalName(node));
                 ts.setOriginalNode(exportStatement, statement);
                 statements.push(exportStatement);
             }
             var emitFlags = ts.getEmitFlags(node);
-            if ((emitFlags & 4194304) === 0) {
+            if ((emitFlags & 4194304 /* HasEndOfDeclarationMarker */) === 0) {
+                // Add a DeclarationMarker as a marker for the end of the declaration
                 statements.push(ts.createEndOfDeclarationMarker(node));
-                ts.setEmitFlags(statement, emitFlags | 4194304);
+                ts.setEmitFlags(statement, emitFlags | 4194304 /* HasEndOfDeclarationMarker */);
             }
             return ts.singleOrMany(statements);
         }
+        /**
+         * Visits a ClassExpression and transforms it into an expression.
+         *
+         * @param node A ClassExpression node.
+         */
         function visitClassExpression(node) {
+            // [source]
+            //      C = class { }
+            //
+            // [output]
+            //      C = (function () {
+            //          function class_1() {
+            //          }
+            //          return class_1;
+            //      }())
             return transformClassLikeDeclarationToExpression(node);
         }
+        /**
+         * Transforms a ClassExpression or ClassDeclaration into an expression.
+         *
+         * @param node A ClassExpression or ClassDeclaration node.
+         */
         function transformClassLikeDeclarationToExpression(node) {
+            // [source]
+            //      class C extends D {
+            //          constructor() {}
+            //          method() {}
+            //          get prop() {}
+            //          set prop(v) {}
+            //      }
+            //
+            // [output]
+            //      (function (_super) {
+            //          __extends(C, _super);
+            //          function C() {
+            //          }
+            //          C.prototype.method = function () {}
+            //          Object.defineProperty(C.prototype, "prop", {
+            //              get: function() {},
+            //              set: function() {},
+            //              enumerable: true,
+            //              configurable: true
+            //          });
+            //          return C;
+            //      }(D))
             if (node.name) {
                 enableSubstitutionsForBlockScopedBindings();
             }
             var extendsClauseElement = ts.getClassExtendsHeritageClauseElement(node);
-            var classFunction = ts.createFunctionExpression(undefined, undefined, undefined, undefined, extendsClauseElement ? [ts.createParameter(undefined, undefined, undefined, ts.createFileLevelUniqueName("_super"))] : [], undefined, transformClassBody(node, extendsClauseElement));
-            ts.setEmitFlags(classFunction, (ts.getEmitFlags(node) & 65536) | 524288);
+            var classFunction = ts.createFunctionExpression(
+            /*modifiers*/ undefined, 
+            /*asteriskToken*/ undefined, 
+            /*name*/ undefined, 
+            /*typeParameters*/ undefined, extendsClauseElement ? [ts.createParameter(/*decorators*/ undefined, /*modifiers*/ undefined, /*dotDotDotToken*/ undefined, ts.createFileLevelUniqueName("_super"))] : [], 
+            /*type*/ undefined, transformClassBody(node, extendsClauseElement));
+            // To preserve the behavior of the old emitter, we explicitly indent
+            // the body of the function here if it was requested in an earlier
+            // transformation.
+            ts.setEmitFlags(classFunction, (ts.getEmitFlags(node) & 65536 /* Indented */) | 524288 /* ReuseTempVariableScope */);
+            // "inner" and "outer" below are added purely to preserve source map locations from
+            // the old emitter
             var inner = ts.createPartiallyEmittedExpression(classFunction);
             inner.end = node.end;
-            ts.setEmitFlags(inner, 1536);
+            ts.setEmitFlags(inner, 1536 /* NoComments */);
             var outer = ts.createPartiallyEmittedExpression(inner);
             outer.end = ts.skipTrivia(currentText, node.pos);
-            ts.setEmitFlags(outer, 1536);
-            var result = ts.createParen(ts.createCall(outer, undefined, extendsClauseElement
+            ts.setEmitFlags(outer, 1536 /* NoComments */);
+            var result = ts.createParen(ts.createCall(outer, 
+            /*typeArguments*/ undefined, extendsClauseElement
                 ? [ts.visitNode(extendsClauseElement.expression, visitor, ts.isExpression)]
                 : []));
-            ts.addSyntheticLeadingComment(result, 3, "* @class ");
+            ts.addSyntheticLeadingComment(result, 3 /* MultiLineCommentTrivia */, "* @class ");
             return result;
         }
+        /**
+         * Transforms a ClassExpression or ClassDeclaration into a function body.
+         *
+         * @param node A ClassExpression or ClassDeclaration node.
+         * @param extendsClauseElement The expression for the class `extends` clause.
+         */
         function transformClassBody(node, extendsClauseElement) {
             var statements = [];
             startLexicalEnvironment();
             addExtendsHelperIfNeeded(statements, node, extendsClauseElement);
             addConstructor(statements, node, extendsClauseElement);
             addClassMembers(statements, node);
-            var closingBraceLocation = ts.createTokenRange(ts.skipTrivia(currentText, node.members.end), 18);
+            // Create a synthetic text range for the return statement.
+            var closingBraceLocation = ts.createTokenRange(ts.skipTrivia(currentText, node.members.end), 18 /* CloseBraceToken */);
             var localName = ts.getInternalName(node);
+            // The following partially-emitted expression exists purely to align our sourcemap
+            // emit with the original emitter.
             var outer = ts.createPartiallyEmittedExpression(localName);
             outer.end = closingBraceLocation.end;
-            ts.setEmitFlags(outer, 1536);
+            ts.setEmitFlags(outer, 1536 /* NoComments */);
             var statement = ts.createReturn(outer);
             statement.pos = closingBraceLocation.pos;
-            ts.setEmitFlags(statement, 1536 | 384);
+            ts.setEmitFlags(statement, 1536 /* NoComments */ | 384 /* NoTokenSourceMaps */);
             statements.push(statement);
             ts.prependStatements(statements, endLexicalEnvironment());
-            var block = ts.createBlock(ts.setTextRange(ts.createNodeArray(statements), node.members), true);
-            ts.setEmitFlags(block, 1536);
+            var block = ts.createBlock(ts.setTextRange(ts.createNodeArray(statements), /*location*/ node.members), /*multiLine*/ true);
+            ts.setEmitFlags(block, 1536 /* NoComments */);
             return block;
         }
+        /**
+         * Adds a call to the `__extends` helper if needed for a class.
+         *
+         * @param statements The statements of the class body function.
+         * @param node The ClassExpression or ClassDeclaration node.
+         * @param extendsClauseElement The expression for the class `extends` clause.
+         */
         function addExtendsHelperIfNeeded(statements, node, extendsClauseElement) {
             if (extendsClauseElement) {
-                statements.push(ts.setTextRange(ts.createStatement(createExtendsHelper(context, ts.getInternalName(node))), extendsClauseElement));
+                statements.push(ts.setTextRange(ts.createStatement(createExtendsHelper(context, ts.getInternalName(node))), 
+                /*location*/ extendsClauseElement));
             }
         }
+        /**
+         * Adds the constructor of the class to a class body function.
+         *
+         * @param statements The statements of the class body function.
+         * @param node The ClassExpression or ClassDeclaration node.
+         * @param extendsClauseElement The expression for the class `extends` clause.
+         */
         function addConstructor(statements, node, extendsClauseElement) {
             var savedConvertedLoopState = convertedLoopState;
             convertedLoopState = undefined;
-            var ancestorFacts = enterSubtree(16278, 73);
+            var ancestorFacts = enterSubtree(16278 /* ConstructorExcludes */, 73 /* ConstructorIncludes */);
             var constructor = ts.getFirstConstructorWithBody(node);
             var hasSynthesizedSuper = hasSynthesizedDefaultSuperCall(constructor, extendsClauseElement !== undefined);
-            var constructorFunction = ts.createFunctionDeclaration(undefined, undefined, undefined, ts.getInternalName(node), undefined, transformConstructorParameters(constructor, hasSynthesizedSuper), undefined, transformConstructorBody(constructor, node, extendsClauseElement, hasSynthesizedSuper));
+            var constructorFunction = ts.createFunctionDeclaration(
+            /*decorators*/ undefined, 
+            /*modifiers*/ undefined, 
+            /*asteriskToken*/ undefined, ts.getInternalName(node), 
+            /*typeParameters*/ undefined, transformConstructorParameters(constructor, hasSynthesizedSuper), 
+            /*type*/ undefined, transformConstructorBody(constructor, node, extendsClauseElement, hasSynthesizedSuper));
             ts.setTextRange(constructorFunction, constructor || node);
             if (extendsClauseElement) {
-                ts.setEmitFlags(constructorFunction, 8);
+                ts.setEmitFlags(constructorFunction, 8 /* CapturesThis */);
             }
             statements.push(constructorFunction);
-            exitSubtree(ancestorFacts, 49152, 0);
+            exitSubtree(ancestorFacts, 49152 /* PropagateNewTargetMask */, 0 /* None */);
             convertedLoopState = savedConvertedLoopState;
         }
+        /**
+         * Transforms the parameters of the constructor declaration of a class.
+         *
+         * @param constructor The constructor for the class.
+         * @param hasSynthesizedSuper A value indicating whether the constructor starts with a
+         *                            synthesized `super` call.
+         */
         function transformConstructorParameters(constructor, hasSynthesizedSuper) {
+            // If the TypeScript transformer needed to synthesize a constructor for property
+            // initializers, it would have also added a synthetic `...args` parameter and
+            // `super` call.
+            // If this is the case, we do not include the synthetic `...args` parameter and
+            // will instead use the `arguments` object in ES5/3.
             return ts.visitParameterList(constructor && !hasSynthesizedSuper ? constructor.parameters : undefined, visitor, context)
                 || [];
         }
+        /**
+         * Transforms the body of a constructor declaration of a class.
+         *
+         * @param constructor The constructor for the class.
+         * @param node The node which contains the constructor.
+         * @param extendsClauseElement The expression for the class `extends` clause.
+         * @param hasSynthesizedSuper A value indicating whether the constructor starts with a
+         *                            synthesized `super` call.
+         */
         function transformConstructorBody(constructor, node, extendsClauseElement, hasSynthesizedSuper) {
             var statements = [];
             resumeLexicalEnvironment();
             var statementOffset = -1;
             if (hasSynthesizedSuper) {
+                // If a super call has already been synthesized,
+                // we're going to assume that we should just transform everything after that.
+                // The assumption is that no prior step in the pipeline has added any prologue directives.
                 statementOffset = 0;
             }
             else if (constructor) {
-                statementOffset = ts.addStandardPrologue(statements, constructor.body.statements, false);
+                statementOffset = ts.addStandardPrologue(statements, constructor.body.statements, /*ensureUseStrict*/ false);
             }
             if (constructor) {
                 addDefaultValueAssignmentsIfNeeded(statements, constructor);
                 addRestParameterIfNeeded(statements, constructor, hasSynthesizedSuper);
                 if (!hasSynthesizedSuper) {
+                    // If no super call has been synthesized, emit custom prologue directives.
                     statementOffset = ts.addCustomPrologue(statements, constructor.body.statements, statementOffset, visitor);
                 }
                 ts.Debug.assert(statementOffset >= 0, "statementOffset not initialized correctly!");
             }
-            var isDerivedClass = !!extendsClauseElement && ts.skipOuterExpressions(extendsClauseElement.expression).kind !== 95;
+            // determine whether the class is known syntactically to be a derived class (e.g. a
+            // class that extends a value that is not syntactically known to be `null`).
+            var isDerivedClass = !!extendsClauseElement && ts.skipOuterExpressions(extendsClauseElement.expression).kind !== 95 /* NullKeyword */;
             var superCaptureStatus = declareOrCaptureOrReturnThisForConstructorIfNeeded(statements, constructor, isDerivedClass, hasSynthesizedSuper, statementOffset);
-            if (superCaptureStatus === 1 || superCaptureStatus === 2) {
+            // The last statement expression was replaced. Skip it.
+            if (superCaptureStatus === 1 /* ReplaceSuperCapture */ || superCaptureStatus === 2 /* ReplaceWithReturn */) {
                 statementOffset++;
             }
             if (constructor) {
-                if (superCaptureStatus === 1) {
-                    hierarchyFacts |= 4096;
+                if (superCaptureStatus === 1 /* ReplaceSuperCapture */) {
+                    hierarchyFacts |= 4096 /* ConstructorWithCapturedSuper */;
                 }
-                ts.addRange(statements, ts.visitNodes(constructor.body.statements, visitor, ts.isStatement, statementOffset));
+                ts.addRange(statements, ts.visitNodes(constructor.body.statements, visitor, ts.isStatement, /*start*/ statementOffset));
             }
+            // Return `_this` unless we're sure enough that it would be pointless to add a return statement.
+            // If there's a constructor that we can tell returns in enough places, then we *do not* want to add a return.
             if (isDerivedClass
-                && superCaptureStatus !== 2
+                && superCaptureStatus !== 2 /* ReplaceWithReturn */
                 && !(constructor && isSufficientlyCoveredByReturnStatements(constructor.body))) {
                 statements.push(ts.createReturn(ts.createFileLevelUniqueName("_this")));
             }
             ts.prependStatements(statements, endLexicalEnvironment());
             if (constructor) {
-                prependCaptureNewTargetIfNeeded(statements, constructor, false);
+                prependCaptureNewTargetIfNeeded(statements, constructor, /*copyOnWrite*/ false);
             }
-            var block = ts.createBlock(ts.setTextRange(ts.createNodeArray(statements), constructor ? constructor.body.statements : node.members), true);
+            var block = ts.createBlock(ts.setTextRange(ts.createNodeArray(statements), 
+            /*location*/ constructor ? constructor.body.statements : node.members), 
+            /*multiLine*/ true);
             ts.setTextRange(block, constructor ? constructor.body : node);
             if (!constructor) {
-                ts.setEmitFlags(block, 1536);
+                ts.setEmitFlags(block, 1536 /* NoComments */);
             }
             return block;
         }
+        /**
+         * We want to try to avoid emitting a return statement in certain cases if a user already returned something.
+         * It would generate obviously dead code, so we'll try to make things a little bit prettier
+         * by doing a minimal check on whether some common patterns always explicitly return.
+         */
         function isSufficientlyCoveredByReturnStatements(statement) {
-            if (statement.kind === 225) {
+            // A return statement is considered covered.
+            if (statement.kind === 225 /* ReturnStatement */) {
                 return true;
             }
-            else if (statement.kind === 217) {
+            // An if-statement with two covered branches is covered.
+            else if (statement.kind === 217 /* IfStatement */) {
                 var ifStatement = statement;
                 if (ifStatement.elseStatement) {
                     return isSufficientlyCoveredByReturnStatements(ifStatement.thenStatement) &&
                         isSufficientlyCoveredByReturnStatements(ifStatement.elseStatement);
                 }
             }
-            else if (statement.kind === 213) {
+            // A block is covered if it has a last statement which is covered.
+            else if (statement.kind === 213 /* Block */) {
                 var lastStatement = ts.lastOrUndefined(statement.statements);
                 if (lastStatement && isSufficientlyCoveredByReturnStatements(lastStatement)) {
                     return true;
@@ -54152,72 +66456,144 @@ var ts;
             }
             return false;
         }
+        /**
+         * Declares a `_this` variable for derived classes and for when arrow functions capture `this`.
+         *
+         * @returns The new statement offset into the `statements` array.
+         */
         function declareOrCaptureOrReturnThisForConstructorIfNeeded(statements, ctor, isDerivedClass, hasSynthesizedSuper, statementOffset) {
+            // If this isn't a derived class, just capture 'this' for arrow functions if necessary.
             if (!isDerivedClass) {
                 if (ctor) {
                     addCaptureThisForNodeIfNeeded(statements, ctor);
                 }
-                return 0;
+                return 0 /* NoReplacement */;
             }
+            // We must be here because the user didn't write a constructor
+            // but we needed to call 'super(...args)' anyway as per 14.5.14 of the ES2016 spec.
+            // If that's the case we can just immediately return the result of a 'super()' call.
             if (!ctor) {
                 statements.push(ts.createReturn(createDefaultSuperCallOrThis()));
-                return 2;
+                return 2 /* ReplaceWithReturn */;
             }
+            // The constructor exists, but it and the 'super()' call it contains were generated
+            // for something like property initializers.
+            // Create a captured '_this' variable and assume it will subsequently be used.
             if (hasSynthesizedSuper) {
                 captureThisForNode(statements, ctor, createDefaultSuperCallOrThis());
                 enableSubstitutionsForCapturedThis();
-                return 1;
+                return 1 /* ReplaceSuperCapture */;
             }
+            // Most of the time, a 'super' call will be the first real statement in a constructor body.
+            // In these cases, we'd like to transform these into a *single* statement instead of a declaration
+            // followed by an assignment statement for '_this'. For instance, if we emitted without an initializer,
+            // we'd get:
+            //
+            //      var _this;
+            //      _this = _super.call(...) || this;
+            //
+            // instead of
+            //
+            //      var _this = _super.call(...) || this;
+            //
+            // Additionally, if the 'super()' call is the last statement, we should just avoid capturing
+            // entirely and immediately return the result like so:
+            //
+            //      return _super.call(...) || this;
+            //
             var firstStatement;
             var superCallExpression;
             var ctorStatements = ctor.body.statements;
             if (statementOffset < ctorStatements.length) {
                 firstStatement = ctorStatements[statementOffset];
-                if (firstStatement.kind === 216 && ts.isSuperCall(firstStatement.expression)) {
+                if (firstStatement.kind === 216 /* ExpressionStatement */ && ts.isSuperCall(firstStatement.expression)) {
                     superCallExpression = visitImmediateSuperCallInBody(firstStatement.expression);
                 }
             }
+            // Return the result if we have an immediate super() call on the last statement,
+            // but only if the constructor itself doesn't use 'this' elsewhere.
             if (superCallExpression
                 && statementOffset === ctorStatements.length - 1
-                && !(ctor.transformFlags & (16384 | 32768))) {
+                && !(ctor.transformFlags & (16384 /* ContainsLexicalThis */ | 32768 /* ContainsCapturedLexicalThis */))) {
                 var returnStatement = ts.createReturn(superCallExpression);
-                if (superCallExpression.kind !== 200
-                    || superCallExpression.left.kind !== 187) {
+                if (superCallExpression.kind !== 200 /* BinaryExpression */
+                    || superCallExpression.left.kind !== 187 /* CallExpression */) {
                     ts.Debug.fail("Assumed generated super call would have form 'super.call(...) || this'.");
                 }
-                ts.setCommentRange(returnStatement, ts.getCommentRange(ts.setEmitFlags(superCallExpression.left, 1536)));
+                // Shift comments from the original super call to the return statement.
+                ts.setCommentRange(returnStatement, ts.getCommentRange(ts.setEmitFlags(superCallExpression.left, 1536 /* NoComments */)));
                 statements.push(returnStatement);
-                return 2;
+                return 2 /* ReplaceWithReturn */;
             }
+            // Perform the capture.
             captureThisForNode(statements, ctor, superCallExpression || createActualThis(), firstStatement);
+            // If we're actually replacing the original statement, we need to signal this to the caller.
             if (superCallExpression) {
-                return 1;
+                return 1 /* ReplaceSuperCapture */;
             }
-            return 0;
+            return 0 /* NoReplacement */;
         }
         function createActualThis() {
-            return ts.setEmitFlags(ts.createThis(), 4);
+            return ts.setEmitFlags(ts.createThis(), 4 /* NoSubstitution */);
         }
         function createDefaultSuperCallOrThis() {
             return ts.createLogicalOr(ts.createLogicalAnd(ts.createStrictInequality(ts.createFileLevelUniqueName("_super"), ts.createNull()), ts.createFunctionApply(ts.createFileLevelUniqueName("_super"), createActualThis(), ts.createIdentifier("arguments"))), createActualThis());
         }
+        /**
+         * Visits a parameter declaration.
+         *
+         * @param node A ParameterDeclaration node.
+         */
         function visitParameter(node) {
             if (node.dotDotDotToken) {
+                // rest parameters are elided
                 return undefined;
             }
             else if (ts.isBindingPattern(node.name)) {
-                return ts.setOriginalNode(ts.setTextRange(ts.createParameter(undefined, undefined, undefined, ts.getGeneratedNameForNode(node), undefined, undefined, undefined), node), node);
+                // Binding patterns are converted into a generated name and are
+                // evaluated inside the function body.
+                return ts.setOriginalNode(ts.setTextRange(ts.createParameter(
+                /*decorators*/ undefined, 
+                /*modifiers*/ undefined, 
+                /*dotDotDotToken*/ undefined, ts.getGeneratedNameForNode(node), 
+                /*questionToken*/ undefined, 
+                /*type*/ undefined, 
+                /*initializer*/ undefined), 
+                /*location*/ node), 
+                /*original*/ node);
             }
             else if (node.initializer) {
-                return ts.setOriginalNode(ts.setTextRange(ts.createParameter(undefined, undefined, undefined, node.name, undefined, undefined, undefined), node), node);
+                // Initializers are elided
+                return ts.setOriginalNode(ts.setTextRange(ts.createParameter(
+                /*decorators*/ undefined, 
+                /*modifiers*/ undefined, 
+                /*dotDotDotToken*/ undefined, node.name, 
+                /*questionToken*/ undefined, 
+                /*type*/ undefined, 
+                /*initializer*/ undefined), 
+                /*location*/ node), 
+                /*original*/ node);
             }
             else {
                 return node;
             }
         }
+        /**
+         * Gets a value indicating whether we need to add default value assignments for a
+         * function-like node.
+         *
+         * @param node A function-like node.
+         */
         function shouldAddDefaultValueAssignments(node) {
-            return (node.transformFlags & 131072) !== 0;
+            return (node.transformFlags & 131072 /* ContainsDefaultValueAssignments */) !== 0;
         }
+        /**
+         * Adds statements to the body of a function-like node if it contains parameters with
+         * binding patterns or initializers.
+         *
+         * @param statements The statements for the new function body.
+         * @param node A function-like node.
+         */
         function addDefaultValueAssignmentsIfNeeded(statements, node) {
             if (!shouldAddDefaultValueAssignments(node)) {
                 return;
@@ -54225,6 +66601,8 @@ var ts;
             for (var _i = 0, _a = node.parameters; _i < _a.length; _i++) {
                 var parameter = _a[_i];
                 var name = parameter.name, initializer = parameter.initializer, dotDotDotToken = parameter.dotDotDotToken;
+                // A rest parameter cannot have a binding pattern or an initializer,
+                // so let's just ignore it.
                 if (dotDotDotToken) {
                     continue;
                 }
@@ -54236,90 +66614,153 @@ var ts;
                 }
             }
         }
+        /**
+         * Adds statements to the body of a function-like node for parameters with binding patterns
+         *
+         * @param statements The statements for the new function body.
+         * @param parameter The parameter for the function.
+         * @param name The name of the parameter.
+         * @param initializer The initializer for the parameter.
+         */
         function addDefaultValueAssignmentForBindingPattern(statements, parameter, name, initializer) {
             var temp = ts.getGeneratedNameForNode(parameter);
+            // In cases where a binding pattern is simply '[]' or '{}',
+            // we usually don't want to emit a var declaration; however, in the presence
+            // of an initializer, we must emit that expression to preserve side effects.
             if (name.elements.length > 0) {
-                statements.push(ts.setEmitFlags(ts.createVariableStatement(undefined, ts.createVariableDeclarationList(ts.flattenDestructuringBinding(parameter, visitor, context, 0, temp))), 1048576));
+                statements.push(ts.setEmitFlags(ts.createVariableStatement(
+                /*modifiers*/ undefined, ts.createVariableDeclarationList(ts.flattenDestructuringBinding(parameter, visitor, context, 0 /* All */, temp))), 1048576 /* CustomPrologue */));
             }
             else if (initializer) {
-                statements.push(ts.setEmitFlags(ts.createStatement(ts.createAssignment(temp, ts.visitNode(initializer, visitor, ts.isExpression))), 1048576));
+                statements.push(ts.setEmitFlags(ts.createStatement(ts.createAssignment(temp, ts.visitNode(initializer, visitor, ts.isExpression))), 1048576 /* CustomPrologue */));
             }
         }
+        /**
+         * Adds statements to the body of a function-like node for parameters with initializers.
+         *
+         * @param statements The statements for the new function body.
+         * @param parameter The parameter for the function.
+         * @param name The name of the parameter.
+         * @param initializer The initializer for the parameter.
+         */
         function addDefaultValueAssignmentForInitializer(statements, parameter, name, initializer) {
             initializer = ts.visitNode(initializer, visitor, ts.isExpression);
             var statement = ts.createIf(ts.createTypeCheck(ts.getSynthesizedClone(name), "undefined"), ts.setEmitFlags(ts.setTextRange(ts.createBlock([
-                ts.createStatement(ts.setEmitFlags(ts.setTextRange(ts.createAssignment(ts.setEmitFlags(ts.getMutableClone(name), 48), ts.setEmitFlags(initializer, 48 | ts.getEmitFlags(initializer) | 1536)), parameter), 1536))
-            ]), parameter), 1 | 32 | 384 | 1536));
+                ts.createStatement(ts.setEmitFlags(ts.setTextRange(ts.createAssignment(ts.setEmitFlags(ts.getMutableClone(name), 48 /* NoSourceMap */), ts.setEmitFlags(initializer, 48 /* NoSourceMap */ | ts.getEmitFlags(initializer) | 1536 /* NoComments */)), parameter), 1536 /* NoComments */))
+            ]), parameter), 1 /* SingleLine */ | 32 /* NoTrailingSourceMap */ | 384 /* NoTokenSourceMaps */ | 1536 /* NoComments */));
             ts.startOnNewLine(statement);
             ts.setTextRange(statement, parameter);
-            ts.setEmitFlags(statement, 384 | 32 | 1048576 | 1536);
+            ts.setEmitFlags(statement, 384 /* NoTokenSourceMaps */ | 32 /* NoTrailingSourceMap */ | 1048576 /* CustomPrologue */ | 1536 /* NoComments */);
             statements.push(statement);
         }
+        /**
+         * Gets a value indicating whether we need to add statements to handle a rest parameter.
+         *
+         * @param node A ParameterDeclaration node.
+         * @param inConstructorWithSynthesizedSuper A value indicating whether the parameter is
+         *                                          part of a constructor declaration with a
+         *                                          synthesized call to `super`
+         */
         function shouldAddRestParameter(node, inConstructorWithSynthesizedSuper) {
-            return node && node.dotDotDotToken && node.name.kind === 71 && !inConstructorWithSynthesizedSuper;
+            return node && node.dotDotDotToken && node.name.kind === 71 /* Identifier */ && !inConstructorWithSynthesizedSuper;
         }
+        /**
+         * Adds statements to the body of a function-like node if it contains a rest parameter.
+         *
+         * @param statements The statements for the new function body.
+         * @param node A function-like node.
+         * @param inConstructorWithSynthesizedSuper A value indicating whether the parameter is
+         *                                          part of a constructor declaration with a
+         *                                          synthesized call to `super`
+         */
         function addRestParameterIfNeeded(statements, node, inConstructorWithSynthesizedSuper) {
             var parameter = ts.lastOrUndefined(node.parameters);
             if (!shouldAddRestParameter(parameter, inConstructorWithSynthesizedSuper)) {
                 return;
             }
+            // `declarationName` is the name of the local declaration for the parameter.
             var declarationName = ts.getMutableClone(parameter.name);
-            ts.setEmitFlags(declarationName, 48);
+            ts.setEmitFlags(declarationName, 48 /* NoSourceMap */);
+            // `expressionName` is the name of the parameter used in expressions.
             var expressionName = ts.getSynthesizedClone(parameter.name);
             var restIndex = node.parameters.length - 1;
             var temp = ts.createLoopVariable();
-            statements.push(ts.setEmitFlags(ts.setTextRange(ts.createVariableStatement(undefined, ts.createVariableDeclarationList([
-                ts.createVariableDeclaration(declarationName, undefined, ts.createArrayLiteral([]))
-            ])), parameter), 1048576));
+            // var param = [];
+            statements.push(ts.setEmitFlags(ts.setTextRange(ts.createVariableStatement(
+            /*modifiers*/ undefined, ts.createVariableDeclarationList([
+                ts.createVariableDeclaration(declarationName, 
+                /*type*/ undefined, ts.createArrayLiteral([]))
+            ])), 
+            /*location*/ parameter), 1048576 /* CustomPrologue */));
+            // for (var _i = restIndex; _i < arguments.length; _i++) {
+            //   param[_i - restIndex] = arguments[_i];
+            // }
             var forStatement = ts.createFor(ts.setTextRange(ts.createVariableDeclarationList([
-                ts.createVariableDeclaration(temp, undefined, ts.createLiteral(restIndex))
+                ts.createVariableDeclaration(temp, /*type*/ undefined, ts.createLiteral(restIndex))
             ]), parameter), ts.setTextRange(ts.createLessThan(temp, ts.createPropertyAccess(ts.createIdentifier("arguments"), "length")), parameter), ts.setTextRange(ts.createPostfixIncrement(temp), parameter), ts.createBlock([
                 ts.startOnNewLine(ts.setTextRange(ts.createStatement(ts.createAssignment(ts.createElementAccess(expressionName, restIndex === 0
                     ? temp
-                    : ts.createSubtract(temp, ts.createLiteral(restIndex))), ts.createElementAccess(ts.createIdentifier("arguments"), temp))), parameter))
+                    : ts.createSubtract(temp, ts.createLiteral(restIndex))), ts.createElementAccess(ts.createIdentifier("arguments"), temp))), 
+                /*location*/ parameter))
             ]));
-            ts.setEmitFlags(forStatement, 1048576);
+            ts.setEmitFlags(forStatement, 1048576 /* CustomPrologue */);
             ts.startOnNewLine(forStatement);
             statements.push(forStatement);
         }
+        /**
+         * Adds a statement to capture the `this` of a function declaration if it is needed.
+         *
+         * @param statements The statements for the new function body.
+         * @param node A node.
+         */
         function addCaptureThisForNodeIfNeeded(statements, node) {
-            if (node.transformFlags & 32768 && node.kind !== 193) {
+            if (node.transformFlags & 32768 /* ContainsCapturedLexicalThis */ && node.kind !== 193 /* ArrowFunction */) {
                 captureThisForNode(statements, node, ts.createThis());
             }
         }
         function captureThisForNode(statements, node, initializer, originalStatement) {
             enableSubstitutionsForCapturedThis();
-            var captureThisStatement = ts.createVariableStatement(undefined, ts.createVariableDeclarationList([
-                ts.createVariableDeclaration(ts.createFileLevelUniqueName("_this"), undefined, initializer)
+            var captureThisStatement = ts.createVariableStatement(
+            /*modifiers*/ undefined, ts.createVariableDeclarationList([
+                ts.createVariableDeclaration(ts.createFileLevelUniqueName("_this"), 
+                /*type*/ undefined, initializer)
             ]));
-            ts.setEmitFlags(captureThisStatement, 1536 | 1048576);
+            ts.setEmitFlags(captureThisStatement, 1536 /* NoComments */ | 1048576 /* CustomPrologue */);
             ts.setTextRange(captureThisStatement, originalStatement);
             ts.setSourceMapRange(captureThisStatement, node);
             statements.push(captureThisStatement);
         }
         function prependCaptureNewTargetIfNeeded(statements, node, copyOnWrite) {
-            if (hierarchyFacts & 16384) {
+            if (hierarchyFacts & 16384 /* NewTarget */) {
                 var newTarget = void 0;
                 switch (node.kind) {
-                    case 193:
+                    case 193 /* ArrowFunction */:
                         return statements;
-                    case 154:
-                    case 156:
-                    case 157:
+                    case 154 /* MethodDeclaration */:
+                    case 156 /* GetAccessor */:
+                    case 157 /* SetAccessor */:
+                        // Methods and accessors cannot be constructors, so 'new.target' will
+                        // always return 'undefined'.
                         newTarget = ts.createVoidZero();
                         break;
-                    case 155:
-                        newTarget = ts.createPropertyAccess(ts.setEmitFlags(ts.createThis(), 4), "constructor");
+                    case 155 /* Constructor */:
+                        // Class constructors can only be called with `new`, so `this.constructor`
+                        // should be relatively safe to use.
+                        newTarget = ts.createPropertyAccess(ts.setEmitFlags(ts.createThis(), 4 /* NoSubstitution */), "constructor");
                         break;
-                    case 234:
-                    case 192:
-                        newTarget = ts.createConditional(ts.createLogicalAnd(ts.setEmitFlags(ts.createThis(), 4), ts.createBinary(ts.setEmitFlags(ts.createThis(), 4), 93, ts.getLocalName(node))), ts.createPropertyAccess(ts.setEmitFlags(ts.createThis(), 4), "constructor"), ts.createVoidZero());
+                    case 234 /* FunctionDeclaration */:
+                    case 192 /* FunctionExpression */:
+                        // Functions can be called or constructed, and may have a `this` due to
+                        // being a member or when calling an imported function via `other_1.f()`.
+                        newTarget = ts.createConditional(ts.createLogicalAnd(ts.setEmitFlags(ts.createThis(), 4 /* NoSubstitution */), ts.createBinary(ts.setEmitFlags(ts.createThis(), 4 /* NoSubstitution */), 93 /* InstanceOfKeyword */, ts.getLocalName(node))), ts.createPropertyAccess(ts.setEmitFlags(ts.createThis(), 4 /* NoSubstitution */), "constructor"), ts.createVoidZero());
                         break;
                     default:
                         return ts.Debug.failBadSyntaxKind(node);
                 }
-                var captureNewTargetStatement = ts.createVariableStatement(undefined, ts.createVariableDeclarationList([
-                    ts.createVariableDeclaration(ts.createFileLevelUniqueName("_newTarget"), undefined, newTarget)
+                var captureNewTargetStatement = ts.createVariableStatement(
+                /*modifiers*/ undefined, ts.createVariableDeclarationList([
+                    ts.createVariableDeclaration(ts.createFileLevelUniqueName("_newTarget"), 
+                    /*type*/ undefined, newTarget)
                 ]));
                 if (copyOnWrite) {
                     return [captureNewTargetStatement].concat(statements);
@@ -54328,24 +66769,32 @@ var ts;
             }
             return statements;
         }
+        /**
+         * Adds statements to the class body function for a class to define the members of the
+         * class.
+         *
+         * @param statements The statements for the class body function.
+         * @param node The ClassExpression or ClassDeclaration node.
+         */
         function addClassMembers(statements, node) {
             for (var _i = 0, _a = node.members; _i < _a.length; _i++) {
                 var member = _a[_i];
                 switch (member.kind) {
-                    case 212:
+                    case 212 /* SemicolonClassElement */:
                         statements.push(transformSemicolonClassElementToStatement(member));
                         break;
-                    case 154:
+                    case 154 /* MethodDeclaration */:
                         statements.push(transformClassMethodDeclarationToStatement(getClassMemberPrefix(node, member), member, node));
                         break;
-                    case 156:
-                    case 157:
+                    case 156 /* GetAccessor */:
+                    case 157 /* SetAccessor */:
                         var accessors = ts.getAllAccessorDeclarations(node.members, member);
                         if (member === accessors.firstAccessor) {
                             statements.push(transformAccessorsToStatement(getClassMemberPrefix(node, member), accessors, node));
                         }
                         break;
-                    case 155:
+                    case 155 /* Constructor */:
+                        // Constructors are handled in visitClassExpression/visitClassDeclaration
                         break;
                     default:
                         ts.Debug.failBadSyntaxKind(node);
@@ -54353,158 +66802,239 @@ var ts;
                 }
             }
         }
+        /**
+         * Transforms a SemicolonClassElement into a statement for a class body function.
+         *
+         * @param member The SemicolonClassElement node.
+         */
         function transformSemicolonClassElementToStatement(member) {
             return ts.setTextRange(ts.createEmptyStatement(), member);
         }
+        /**
+         * Transforms a MethodDeclaration into a statement for a class body function.
+         *
+         * @param receiver The receiver for the member.
+         * @param member The MethodDeclaration node.
+         */
         function transformClassMethodDeclarationToStatement(receiver, member, container) {
-            var ancestorFacts = enterSubtree(0, 0);
+            var ancestorFacts = enterSubtree(0 /* None */, 0 /* None */);
             var commentRange = ts.getCommentRange(member);
             var sourceMapRange = ts.getSourceMapRange(member);
-            var memberName = ts.createMemberAccessForPropertyName(receiver, ts.visitNode(member.name, visitor, ts.isPropertyName), member.name);
-            var memberFunction = transformFunctionLikeToExpression(member, member, undefined, container);
-            ts.setEmitFlags(memberFunction, 1536);
+            var memberName = ts.createMemberAccessForPropertyName(receiver, ts.visitNode(member.name, visitor, ts.isPropertyName), /*location*/ member.name);
+            var memberFunction = transformFunctionLikeToExpression(member, /*location*/ member, /*name*/ undefined, container);
+            ts.setEmitFlags(memberFunction, 1536 /* NoComments */);
             ts.setSourceMapRange(memberFunction, sourceMapRange);
-            var statement = ts.setTextRange(ts.createStatement(ts.createAssignment(memberName, memberFunction)), member);
+            var statement = ts.setTextRange(ts.createStatement(ts.createAssignment(memberName, memberFunction)), 
+            /*location*/ member);
             ts.setOriginalNode(statement, member);
             ts.setCommentRange(statement, commentRange);
-            ts.setEmitFlags(statement, 48);
-            exitSubtree(ancestorFacts, 49152, hierarchyFacts & 49152 ? 16384 : 0);
+            // The location for the statement is used to emit comments only.
+            // No source map should be emitted for this statement to align with the
+            // old emitter.
+            ts.setEmitFlags(statement, 48 /* NoSourceMap */);
+            exitSubtree(ancestorFacts, 49152 /* PropagateNewTargetMask */, hierarchyFacts & 49152 /* PropagateNewTargetMask */ ? 16384 /* NewTarget */ : 0 /* None */);
             return statement;
         }
+        /**
+         * Transforms a set of related of get/set accessors into a statement for a class body function.
+         *
+         * @param receiver The receiver for the member.
+         * @param accessors The set of related get/set accessors.
+         */
         function transformAccessorsToStatement(receiver, accessors, container) {
-            var statement = ts.createStatement(transformAccessorsToExpression(receiver, accessors, container, false));
-            ts.setEmitFlags(statement, 1536);
+            var statement = ts.createStatement(transformAccessorsToExpression(receiver, accessors, container, /*startsOnNewLine*/ false));
+            // The location for the statement is used to emit source maps only.
+            // No comments should be emitted for this statement to align with the
+            // old emitter.
+            ts.setEmitFlags(statement, 1536 /* NoComments */);
             ts.setSourceMapRange(statement, ts.getSourceMapRange(accessors.firstAccessor));
             return statement;
         }
+        /**
+         * Transforms a set of related get/set accessors into an expression for either a class
+         * body function or an ObjectLiteralExpression with computed properties.
+         *
+         * @param receiver The receiver for the member.
+         */
         function transformAccessorsToExpression(receiver, _a, container, startsOnNewLine) {
             var firstAccessor = _a.firstAccessor, getAccessor = _a.getAccessor, setAccessor = _a.setAccessor;
-            var ancestorFacts = enterSubtree(0, 0);
+            var ancestorFacts = enterSubtree(0 /* None */, 0 /* None */);
+            // To align with source maps in the old emitter, the receiver and property name
+            // arguments are both mapped contiguously to the accessor name.
             var target = ts.getMutableClone(receiver);
-            ts.setEmitFlags(target, 1536 | 32);
-            ts.setSourceMapRange(target, firstAccessor.name);
+            ts.setEmitFlags(target, 1536 /* NoComments */ | 32 /* NoTrailingSourceMap */);
+            ts.setSourceMapRange(target, firstAccessor.name); // TODO: GH#18217
             var propertyName = ts.createExpressionForPropertyName(ts.visitNode(firstAccessor.name, visitor, ts.isPropertyName));
-            ts.setEmitFlags(propertyName, 1536 | 16);
+            ts.setEmitFlags(propertyName, 1536 /* NoComments */ | 16 /* NoLeadingSourceMap */);
             ts.setSourceMapRange(propertyName, firstAccessor.name);
             var properties = [];
             if (getAccessor) {
-                var getterFunction = transformFunctionLikeToExpression(getAccessor, undefined, undefined, container);
+                var getterFunction = transformFunctionLikeToExpression(getAccessor, /*location*/ undefined, /*name*/ undefined, container);
                 ts.setSourceMapRange(getterFunction, ts.getSourceMapRange(getAccessor));
-                ts.setEmitFlags(getterFunction, 512);
+                ts.setEmitFlags(getterFunction, 512 /* NoLeadingComments */);
                 var getter = ts.createPropertyAssignment("get", getterFunction);
                 ts.setCommentRange(getter, ts.getCommentRange(getAccessor));
                 properties.push(getter);
             }
             if (setAccessor) {
-                var setterFunction = transformFunctionLikeToExpression(setAccessor, undefined, undefined, container);
+                var setterFunction = transformFunctionLikeToExpression(setAccessor, /*location*/ undefined, /*name*/ undefined, container);
                 ts.setSourceMapRange(setterFunction, ts.getSourceMapRange(setAccessor));
-                ts.setEmitFlags(setterFunction, 512);
+                ts.setEmitFlags(setterFunction, 512 /* NoLeadingComments */);
                 var setter = ts.createPropertyAssignment("set", setterFunction);
                 ts.setCommentRange(setter, ts.getCommentRange(setAccessor));
                 properties.push(setter);
             }
             properties.push(ts.createPropertyAssignment("enumerable", ts.createTrue()), ts.createPropertyAssignment("configurable", ts.createTrue()));
-            var call = ts.createCall(ts.createPropertyAccess(ts.createIdentifier("Object"), "defineProperty"), undefined, [
+            var call = ts.createCall(ts.createPropertyAccess(ts.createIdentifier("Object"), "defineProperty"), 
+            /*typeArguments*/ undefined, [
                 target,
                 propertyName,
-                ts.createObjectLiteral(properties, true)
+                ts.createObjectLiteral(properties, /*multiLine*/ true)
             ]);
             if (startsOnNewLine) {
                 ts.startOnNewLine(call);
             }
-            exitSubtree(ancestorFacts, 49152, hierarchyFacts & 49152 ? 16384 : 0);
+            exitSubtree(ancestorFacts, 49152 /* PropagateNewTargetMask */, hierarchyFacts & 49152 /* PropagateNewTargetMask */ ? 16384 /* NewTarget */ : 0 /* None */);
             return call;
         }
+        /**
+         * Visits an ArrowFunction and transforms it into a FunctionExpression.
+         *
+         * @param node An ArrowFunction node.
+         */
         function visitArrowFunction(node) {
-            if (node.transformFlags & 16384) {
+            if (node.transformFlags & 16384 /* ContainsLexicalThis */) {
                 enableSubstitutionsForCapturedThis();
             }
             var savedConvertedLoopState = convertedLoopState;
             convertedLoopState = undefined;
-            var ancestorFacts = enterSubtree(16256, 66);
-            var func = ts.createFunctionExpression(undefined, undefined, undefined, undefined, ts.visitParameterList(node.parameters, visitor, context), undefined, transformFunctionBody(node));
+            var ancestorFacts = enterSubtree(16256 /* ArrowFunctionExcludes */, 66 /* ArrowFunctionIncludes */);
+            var func = ts.createFunctionExpression(
+            /*modifiers*/ undefined, 
+            /*asteriskToken*/ undefined, 
+            /*name*/ undefined, 
+            /*typeParameters*/ undefined, ts.visitParameterList(node.parameters, visitor, context), 
+            /*type*/ undefined, transformFunctionBody(node));
             ts.setTextRange(func, node);
             ts.setOriginalNode(func, node);
-            ts.setEmitFlags(func, 8);
-            exitSubtree(ancestorFacts, 0, 0);
+            ts.setEmitFlags(func, 8 /* CapturesThis */);
+            exitSubtree(ancestorFacts, 0 /* None */, 0 /* None */);
             convertedLoopState = savedConvertedLoopState;
             return func;
         }
+        /**
+         * Visits a FunctionExpression node.
+         *
+         * @param node a FunctionExpression node.
+         */
         function visitFunctionExpression(node) {
-            var ancestorFacts = ts.getEmitFlags(node) & 262144
-                ? enterSubtree(16278, 69)
-                : enterSubtree(16286, 65);
+            var ancestorFacts = ts.getEmitFlags(node) & 262144 /* AsyncFunctionBody */
+                ? enterSubtree(16278 /* AsyncFunctionBodyExcludes */, 69 /* AsyncFunctionBodyIncludes */)
+                : enterSubtree(16286 /* FunctionExcludes */, 65 /* FunctionIncludes */);
             var savedConvertedLoopState = convertedLoopState;
             convertedLoopState = undefined;
             var parameters = ts.visitParameterList(node.parameters, visitor, context);
-            var body = node.transformFlags & 64
+            var body = node.transformFlags & 64 /* ES2015 */
                 ? transformFunctionBody(node)
                 : visitFunctionBodyDownLevel(node);
-            var name = hierarchyFacts & 16384
+            var name = hierarchyFacts & 16384 /* NewTarget */
                 ? ts.getLocalName(node)
                 : node.name;
-            exitSubtree(ancestorFacts, 49152, 0);
+            exitSubtree(ancestorFacts, 49152 /* PropagateNewTargetMask */, 0 /* None */);
             convertedLoopState = savedConvertedLoopState;
-            return ts.updateFunctionExpression(node, undefined, node.asteriskToken, name, undefined, parameters, undefined, body);
+            return ts.updateFunctionExpression(node, 
+            /*modifiers*/ undefined, node.asteriskToken, name, 
+            /*typeParameters*/ undefined, parameters, 
+            /*type*/ undefined, body);
         }
+        /**
+         * Visits a FunctionDeclaration node.
+         *
+         * @param node a FunctionDeclaration node.
+         */
         function visitFunctionDeclaration(node) {
             var savedConvertedLoopState = convertedLoopState;
             convertedLoopState = undefined;
-            var ancestorFacts = enterSubtree(16286, 65);
+            var ancestorFacts = enterSubtree(16286 /* FunctionExcludes */, 65 /* FunctionIncludes */);
             var parameters = ts.visitParameterList(node.parameters, visitor, context);
-            var body = node.transformFlags & 64
+            var body = node.transformFlags & 64 /* ES2015 */
                 ? transformFunctionBody(node)
                 : visitFunctionBodyDownLevel(node);
-            var name = hierarchyFacts & 16384
+            var name = hierarchyFacts & 16384 /* NewTarget */
                 ? ts.getLocalName(node)
                 : node.name;
-            exitSubtree(ancestorFacts, 49152, 0);
+            exitSubtree(ancestorFacts, 49152 /* PropagateNewTargetMask */, 0 /* None */);
             convertedLoopState = savedConvertedLoopState;
-            return ts.updateFunctionDeclaration(node, undefined, ts.visitNodes(node.modifiers, visitor, ts.isModifier), node.asteriskToken, name, undefined, parameters, undefined, body);
+            return ts.updateFunctionDeclaration(node, 
+            /*decorators*/ undefined, ts.visitNodes(node.modifiers, visitor, ts.isModifier), node.asteriskToken, name, 
+            /*typeParameters*/ undefined, parameters, 
+            /*type*/ undefined, body);
         }
+        /**
+         * Transforms a function-like node into a FunctionExpression.
+         *
+         * @param node The function-like node to transform.
+         * @param location The source-map location for the new FunctionExpression.
+         * @param name The name of the new FunctionExpression.
+         */
         function transformFunctionLikeToExpression(node, location, name, container) {
             var savedConvertedLoopState = convertedLoopState;
             convertedLoopState = undefined;
-            var ancestorFacts = container && ts.isClassLike(container) && !ts.hasModifier(node, 32)
-                ? enterSubtree(16286, 65 | 8)
-                : enterSubtree(16286, 65);
+            var ancestorFacts = container && ts.isClassLike(container) && !ts.hasModifier(node, 32 /* Static */)
+                ? enterSubtree(16286 /* FunctionExcludes */, 65 /* FunctionIncludes */ | 8 /* NonStaticClassElement */)
+                : enterSubtree(16286 /* FunctionExcludes */, 65 /* FunctionIncludes */);
             var parameters = ts.visitParameterList(node.parameters, visitor, context);
             var body = transformFunctionBody(node);
-            if (hierarchyFacts & 16384 && !name && (node.kind === 234 || node.kind === 192)) {
+            if (hierarchyFacts & 16384 /* NewTarget */ && !name && (node.kind === 234 /* FunctionDeclaration */ || node.kind === 192 /* FunctionExpression */)) {
                 name = ts.getGeneratedNameForNode(node);
             }
-            exitSubtree(ancestorFacts, 49152, 0);
+            exitSubtree(ancestorFacts, 49152 /* PropagateNewTargetMask */, 0 /* None */);
             convertedLoopState = savedConvertedLoopState;
-            return ts.setOriginalNode(ts.setTextRange(ts.createFunctionExpression(undefined, node.asteriskToken, name, undefined, parameters, undefined, body), location), node);
+            return ts.setOriginalNode(ts.setTextRange(ts.createFunctionExpression(
+            /*modifiers*/ undefined, node.asteriskToken, name, 
+            /*typeParameters*/ undefined, parameters, 
+            /*type*/ undefined, body), location), 
+            /*original*/ node);
         }
+        /**
+         * Transforms the body of a function-like node.
+         *
+         * @param node A function-like node.
+         */
         function transformFunctionBody(node) {
-            var multiLine = false;
-            var singleLine = false;
+            var multiLine = false; // indicates whether the block *must* be emitted as multiple lines
+            var singleLine = false; // indicates whether the block *may* be emitted as a single line
             var statementsLocation;
             var closeBraceLocation;
+            var leadingStatements = [];
             var statements = [];
             var body = node.body;
             var statementOffset;
             resumeLexicalEnvironment();
             if (ts.isBlock(body)) {
-                statementOffset = ts.addStandardPrologue(statements, body.statements, false);
-            }
-            addCaptureThisForNodeIfNeeded(statements, node);
-            addDefaultValueAssignmentsIfNeeded(statements, node);
-            addRestParameterIfNeeded(statements, node, false);
-            if (!multiLine && statements.length > 0) {
-                multiLine = true;
+                // ensureUseStrict is false because no new prologue-directive should be added.
+                // addStandardPrologue will put already-existing directives at the beginning of the target statement-array
+                statementOffset = ts.addStandardPrologue(leadingStatements, body.statements, /*ensureUseStrict*/ false);
             }
+            addCaptureThisForNodeIfNeeded(leadingStatements, node);
+            addDefaultValueAssignmentsIfNeeded(leadingStatements, node);
+            addRestParameterIfNeeded(leadingStatements, node, /*inConstructorWithSynthesizedSuper*/ false);
             if (ts.isBlock(body)) {
-                statementOffset = ts.addCustomPrologue(statements, body.statements, statementOffset, visitor);
+                // addCustomPrologue puts already-existing directives at the beginning of the target statement-array
+                statementOffset = ts.addCustomPrologue(leadingStatements, body.statements, statementOffset, visitor);
                 statementsLocation = body.statements;
                 ts.addRange(statements, ts.visitNodes(body.statements, visitor, ts.isStatement, statementOffset));
+                // If the original body was a multi-line block, this must be a multi-line block.
                 if (!multiLine && body.multiLine) {
                     multiLine = true;
                 }
             }
             else {
-                ts.Debug.assert(node.kind === 193);
+                ts.Debug.assert(node.kind === 193 /* ArrowFunction */);
+                // To align with the old emitter, we use a synthetic end position on the location
+                // for the statement list we synthesize when we down-level an arrow function with
+                // an expression function body. This prevents both comments and source maps from
+                // being emitted for the end position only.
                 statementsLocation = ts.moveRangeEnd(body, -1);
                 var equalsGreaterThanToken = node.equalsGreaterThanToken;
                 if (!ts.nodeIsSynthesized(equalsGreaterThanToken) && !ts.nodeIsSynthesized(body)) {
@@ -54519,72 +67049,103 @@ var ts;
                 var returnStatement = ts.createReturn(expression);
                 ts.setTextRange(returnStatement, body);
                 ts.moveSyntheticComments(returnStatement, body);
-                ts.setEmitFlags(returnStatement, 384 | 32 | 1024);
+                ts.setEmitFlags(returnStatement, 384 /* NoTokenSourceMaps */ | 32 /* NoTrailingSourceMap */ | 1024 /* NoTrailingComments */);
                 statements.push(returnStatement);
+                // To align with the source map emit for the old emitter, we set a custom
+                // source map location for the close brace.
                 closeBraceLocation = body;
             }
             var lexicalEnvironment = context.endLexicalEnvironment();
             ts.prependStatements(statements, lexicalEnvironment);
-            prependCaptureNewTargetIfNeeded(statements, node, false);
-            if (!multiLine && lexicalEnvironment && lexicalEnvironment.length) {
+            prependCaptureNewTargetIfNeeded(statements, node, /*copyOnWrite*/ false);
+            // If we added any final generated statements, this must be a multi-line block
+            if (ts.some(leadingStatements) || ts.some(lexicalEnvironment)) {
                 multiLine = true;
             }
-            var block = ts.createBlock(ts.setTextRange(ts.createNodeArray(statements), statementsLocation), multiLine);
+            var block = ts.createBlock(ts.setTextRange(ts.createNodeArray(leadingStatements.concat(statements)), statementsLocation), multiLine);
             ts.setTextRange(block, node.body);
             if (!multiLine && singleLine) {
-                ts.setEmitFlags(block, 1);
+                ts.setEmitFlags(block, 1 /* SingleLine */);
             }
             if (closeBraceLocation) {
-                ts.setTokenSourceMapRange(block, 18, closeBraceLocation);
+                ts.setTokenSourceMapRange(block, 18 /* CloseBraceToken */, closeBraceLocation);
             }
             ts.setOriginalNode(block, node.body);
             return block;
         }
         function visitFunctionBodyDownLevel(node) {
             var updated = ts.visitFunctionBody(node.body, functionBodyVisitor, context);
-            return ts.updateBlock(updated, ts.setTextRange(ts.createNodeArray(prependCaptureNewTargetIfNeeded(updated.statements, node, true)), updated.statements));
+            return ts.updateBlock(updated, ts.setTextRange(ts.createNodeArray(prependCaptureNewTargetIfNeeded(updated.statements, node, /*copyOnWrite*/ true)), 
+            /*location*/ updated.statements));
         }
         function visitBlock(node, isFunctionBody) {
             if (isFunctionBody) {
+                // A function body is not a block scope.
                 return ts.visitEachChild(node, visitor, context);
             }
-            var ancestorFacts = hierarchyFacts & 256
-                ? enterSubtree(4032, 512)
-                : enterSubtree(3904, 128);
+            var ancestorFacts = hierarchyFacts & 256 /* IterationStatement */
+                ? enterSubtree(4032 /* IterationStatementBlockExcludes */, 512 /* IterationStatementBlockIncludes */)
+                : enterSubtree(3904 /* BlockExcludes */, 128 /* BlockIncludes */);
             var updated = ts.visitEachChild(node, visitor, context);
-            exitSubtree(ancestorFacts, 0, 0);
+            exitSubtree(ancestorFacts, 0 /* None */, 0 /* None */);
             return updated;
         }
+        /**
+         * Visits an ExpressionStatement that contains a destructuring assignment.
+         *
+         * @param node An ExpressionStatement node.
+         */
         function visitExpressionStatement(node) {
+            // If we are here it is most likely because our expression is a destructuring assignment.
             switch (node.expression.kind) {
-                case 191:
-                    return ts.updateStatement(node, visitParenthesizedExpression(node.expression, false));
-                case 200:
-                    return ts.updateStatement(node, visitBinaryExpression(node.expression, false));
+                case 191 /* ParenthesizedExpression */:
+                    return ts.updateStatement(node, visitParenthesizedExpression(node.expression, /*needsDestructuringValue*/ false));
+                case 200 /* BinaryExpression */:
+                    return ts.updateStatement(node, visitBinaryExpression(node.expression, /*needsDestructuringValue*/ false));
             }
             return ts.visitEachChild(node, visitor, context);
         }
+        /**
+         * Visits a ParenthesizedExpression that may contain a destructuring assignment.
+         *
+         * @param node A ParenthesizedExpression node.
+         * @param needsDestructuringValue A value indicating whether we need to hold onto the rhs
+         *                                of a destructuring assignment.
+         */
         function visitParenthesizedExpression(node, needsDestructuringValue) {
+            // If we are here it is most likely because our expression is a destructuring assignment.
             if (!needsDestructuringValue) {
+                // By default we always emit the RHS at the end of a flattened destructuring
+                // expression. If we are in a state where we do not need the destructuring value,
+                // we pass that information along to the children that care about it.
                 switch (node.expression.kind) {
-                    case 191:
-                        return ts.updateParen(node, visitParenthesizedExpression(node.expression, false));
-                    case 200:
-                        return ts.updateParen(node, visitBinaryExpression(node.expression, false));
+                    case 191 /* ParenthesizedExpression */:
+                        return ts.updateParen(node, visitParenthesizedExpression(node.expression, /*needsDestructuringValue*/ false));
+                    case 200 /* BinaryExpression */:
+                        return ts.updateParen(node, visitBinaryExpression(node.expression, /*needsDestructuringValue*/ false));
                 }
             }
             return ts.visitEachChild(node, visitor, context);
         }
+        /**
+         * Visits a BinaryExpression that contains a destructuring assignment.
+         *
+         * @param node A BinaryExpression node.
+         * @param needsDestructuringValue A value indicating whether we need to hold onto the rhs
+         *                                of a destructuring assignment.
+         */
         function visitBinaryExpression(node, needsDestructuringValue) {
+            // If we are here it is because this is a destructuring assignment.
             if (ts.isDestructuringAssignment(node)) {
-                return ts.flattenDestructuringAssignment(node, visitor, context, 0, needsDestructuringValue);
+                return ts.flattenDestructuringAssignment(node, visitor, context, 0 /* All */, needsDestructuringValue);
             }
             return ts.visitEachChild(node, visitor, context);
         }
         function visitVariableStatement(node) {
-            var ancestorFacts = enterSubtree(0, ts.hasModifier(node, 1) ? 32 : 0);
+            var ancestorFacts = enterSubtree(0 /* None */, ts.hasModifier(node, 1 /* Export */) ? 32 /* ExportedVariableStatement */ : 0 /* None */);
             var updated;
-            if (convertedLoopState && (node.declarationList.flags & 3) === 0) {
+            if (convertedLoopState && (node.declarationList.flags & 3 /* BlockScoped */) === 0) {
+                // we are inside a converted loop - hoist variable declarations
                 var assignments = void 0;
                 for (var _i = 0, _a = node.declarationList.declarations; _i < _a.length; _i++) {
                     var decl = _a[_i];
@@ -54592,10 +67153,10 @@ var ts;
                     if (decl.initializer) {
                         var assignment = void 0;
                         if (ts.isBindingPattern(decl.name)) {
-                            assignment = ts.flattenDestructuringAssignment(decl, visitor, context, 0);
+                            assignment = ts.flattenDestructuringAssignment(decl, visitor, context, 0 /* All */);
                         }
                         else {
-                            assignment = ts.createBinary(decl.name, 58, ts.visitNode(decl.initializer, visitor, ts.isExpression));
+                            assignment = ts.createBinary(decl.name, 58 /* EqualsToken */, ts.visitNode(decl.initializer, visitor, ts.isExpression));
                             ts.setTextRange(assignment, decl);
                         }
                         assignments = ts.append(assignments, assignment);
@@ -54605,29 +67166,37 @@ var ts;
                     updated = ts.setTextRange(ts.createStatement(ts.inlineExpressions(assignments)), node);
                 }
                 else {
+                    // none of declarations has initializer - the entire variable statement can be deleted
                     updated = undefined;
                 }
             }
             else {
                 updated = ts.visitEachChild(node, visitor, context);
             }
-            exitSubtree(ancestorFacts, 0, 0);
+            exitSubtree(ancestorFacts, 0 /* None */, 0 /* None */);
             return updated;
         }
+        /**
+         * Visits a VariableDeclarationList that is block scoped (e.g. `let` or `const`).
+         *
+         * @param node A VariableDeclarationList node.
+         */
         function visitVariableDeclarationList(node) {
-            if (node.transformFlags & 64) {
-                if (node.flags & 3) {
+            if (node.transformFlags & 64 /* ES2015 */) {
+                if (node.flags & 3 /* BlockScoped */) {
                     enableSubstitutionsForBlockScopedBindings();
                 }
-                var declarations = ts.flatMap(node.declarations, node.flags & 1
+                var declarations = ts.flatMap(node.declarations, node.flags & 1 /* Let */
                     ? visitVariableDeclarationInLetDeclarationList
                     : visitVariableDeclaration);
                 var declarationList = ts.createVariableDeclarationList(declarations);
                 ts.setOriginalNode(declarationList, node);
                 ts.setTextRange(declarationList, node);
                 ts.setCommentRange(declarationList, node);
-                if (node.transformFlags & 8388608
+                if (node.transformFlags & 8388608 /* ContainsBindingPattern */
                     && (ts.isBindingPattern(node.declarations[0].name) || ts.isBindingPattern(ts.last(node.declarations).name))) {
+                    // If the first or last declaration is a binding pattern, we need to modify
+                    // the source map range for the declaration list.
                     var firstDeclaration = ts.firstOrUndefined(declarations);
                     if (firstDeclaration) {
                         ts.setSourceMapRange(declarationList, ts.createRange(firstDeclaration.pos, ts.last(declarations).end));
@@ -54637,23 +67206,76 @@ var ts;
             }
             return ts.visitEachChild(node, visitor, context);
         }
+        /**
+         * Gets a value indicating whether we should emit an explicit initializer for a variable
+         * declaration in a `let` declaration list.
+         *
+         * @param node A VariableDeclaration node.
+         */
         function shouldEmitExplicitInitializerForLetDeclaration(node) {
+            // Nested let bindings might need to be initialized explicitly to preserve
+            // ES6 semantic:
+            //
+            //  { let x = 1; }
+            //  { let x; } // x here should be undefined. not 1
+            //
+            // Top level bindings never collide with anything and thus don't require
+            // explicit initialization. As for nested let bindings there are two cases:
+            //
+            // - Nested let bindings that were not renamed definitely should be
+            //   initialized explicitly:
+            //
+            //    { let x = 1; }
+            //    { let x; if (some-condition) { x = 1}; if (x) { /*1*/ } }
+            //
+            //   Without explicit initialization code in /*1*/ can be executed even if
+            //   some-condition is evaluated to false.
+            //
+            // - Renaming introduces fresh name that should not collide with any
+            //   existing names, however renamed bindings sometimes also should be
+            //   explicitly initialized. One particular case: non-captured binding
+            //   declared inside loop body (but not in loop initializer):
+            //
+            //    let x;
+            //    for (;;) {
+            //        let x;
+            //    }
+            //
+            //   In downlevel codegen inner 'x' will be renamed so it won't collide
+            //   with outer 'x' however it will should be reset on every iteration as
+            //   if it was declared anew.
+            //
+            //   * Why non-captured binding?
+            //     - Because if loop contains block scoped binding captured in some
+            //       function then loop body will be rewritten to have a fresh scope
+            //       on every iteration so everything will just work.
+            //
+            //   * Why loop initializer is excluded?
+            //     - Since we've introduced a fresh name it already will be undefined.
             var flags = resolver.getNodeCheckFlags(node);
-            var isCapturedInFunction = flags & 131072;
-            var isDeclaredInLoop = flags & 262144;
-            var emittedAsTopLevel = (hierarchyFacts & 64) !== 0
+            var isCapturedInFunction = flags & 131072 /* CapturedBlockScopedBinding */;
+            var isDeclaredInLoop = flags & 262144 /* BlockScopedBindingInLoop */;
+            var emittedAsTopLevel = (hierarchyFacts & 64 /* TopLevel */) !== 0
                 || (isCapturedInFunction
                     && isDeclaredInLoop
-                    && (hierarchyFacts & 512) !== 0);
+                    && (hierarchyFacts & 512 /* IterationStatementBlock */) !== 0);
             var emitExplicitInitializer = !emittedAsTopLevel
-                && (hierarchyFacts & 2048) === 0
+                && (hierarchyFacts & 2048 /* ForInOrForOfStatement */) === 0
                 && (!resolver.isDeclarationWithCollidingName(node)
                     || (isDeclaredInLoop
                         && !isCapturedInFunction
-                        && (hierarchyFacts & (1024 | 2048)) === 0));
+                        && (hierarchyFacts & (1024 /* ForStatement */ | 2048 /* ForInOrForOfStatement */)) === 0));
             return emitExplicitInitializer;
         }
+        /**
+         * Visits a VariableDeclaration in a `let` declaration list.
+         *
+         * @param node A VariableDeclaration node.
+         */
         function visitVariableDeclarationInLetDeclarationList(node) {
+            // For binding pattern names that lack initializers there is no point to emit
+            // explicit initializer since downlevel codegen for destructuring will fail
+            // in the absence of initializer so all binding elements will say uninitialized
             var name = node.name;
             if (ts.isBindingPattern(name)) {
                 return visitVariableDeclaration(node);
@@ -54665,16 +67287,22 @@ var ts;
             }
             return ts.visitEachChild(node, visitor, context);
         }
+        /**
+         * Visits a VariableDeclaration node with a binding pattern.
+         *
+         * @param node A VariableDeclaration node.
+         */
         function visitVariableDeclaration(node) {
-            var ancestorFacts = enterSubtree(32, 0);
+            var ancestorFacts = enterSubtree(32 /* ExportedVariableStatement */, 0 /* None */);
             var updated;
             if (ts.isBindingPattern(node.name)) {
-                updated = ts.flattenDestructuringBinding(node, visitor, context, 0, undefined, (ancestorFacts & 32) !== 0);
+                updated = ts.flattenDestructuringBinding(node, visitor, context, 0 /* All */, 
+                /*value*/ undefined, (ancestorFacts & 32 /* ExportedVariableStatement */) !== 0);
             }
             else {
                 updated = ts.visitEachChild(node, visitor, context);
             }
-            exitSubtree(ancestorFacts, 0, 0);
+            exitSubtree(ancestorFacts, 0 /* None */, 0 /* None */);
             return updated;
         }
         function recordLabel(node) {
@@ -54688,67 +67316,78 @@ var ts;
                 convertedLoopState.labels = ts.createMap();
             }
             var statement = ts.unwrapInnermostStatementOfLabel(node, convertedLoopState && recordLabel);
-            return ts.isIterationStatement(statement, false)
-                ? visitIterationStatement(statement, node)
+            return ts.isIterationStatement(statement, /*lookInLabeledStatements*/ false)
+                ? visitIterationStatement(statement, /*outermostLabeledStatement*/ node)
                 : ts.restoreEnclosingLabel(ts.visitNode(statement, visitor, ts.isStatement), node, convertedLoopState && resetLabel);
         }
         function visitIterationStatement(node, outermostLabeledStatement) {
             switch (node.kind) {
-                case 218:
-                case 219:
+                case 218 /* DoStatement */:
+                case 219 /* WhileStatement */:
                     return visitDoOrWhileStatement(node, outermostLabeledStatement);
-                case 220:
+                case 220 /* ForStatement */:
                     return visitForStatement(node, outermostLabeledStatement);
-                case 221:
+                case 221 /* ForInStatement */:
                     return visitForInStatement(node, outermostLabeledStatement);
-                case 222:
+                case 222 /* ForOfStatement */:
                     return visitForOfStatement(node, outermostLabeledStatement);
             }
         }
         function visitIterationStatementWithFacts(excludeFacts, includeFacts, node, outermostLabeledStatement, convert) {
             var ancestorFacts = enterSubtree(excludeFacts, includeFacts);
             var updated = convertIterationStatementBodyIfNecessary(node, outermostLabeledStatement, convert);
-            exitSubtree(ancestorFacts, 0, 0);
+            exitSubtree(ancestorFacts, 0 /* None */, 0 /* None */);
             return updated;
         }
         function visitDoOrWhileStatement(node, outermostLabeledStatement) {
-            return visitIterationStatementWithFacts(0, 256, node, outermostLabeledStatement);
+            return visitIterationStatementWithFacts(0 /* DoOrWhileStatementExcludes */, 256 /* DoOrWhileStatementIncludes */, node, outermostLabeledStatement);
         }
         function visitForStatement(node, outermostLabeledStatement) {
-            return visitIterationStatementWithFacts(3008, 1280, node, outermostLabeledStatement);
+            return visitIterationStatementWithFacts(3008 /* ForStatementExcludes */, 1280 /* ForStatementIncludes */, node, outermostLabeledStatement);
         }
         function visitForInStatement(node, outermostLabeledStatement) {
-            return visitIterationStatementWithFacts(1984, 2304, node, outermostLabeledStatement);
+            return visitIterationStatementWithFacts(1984 /* ForInOrForOfStatementExcludes */, 2304 /* ForInOrForOfStatementIncludes */, node, outermostLabeledStatement);
         }
         function visitForOfStatement(node, outermostLabeledStatement) {
-            return visitIterationStatementWithFacts(1984, 2304, node, outermostLabeledStatement, compilerOptions.downlevelIteration ? convertForOfStatementForIterable : convertForOfStatementForArray);
+            return visitIterationStatementWithFacts(1984 /* ForInOrForOfStatementExcludes */, 2304 /* ForInOrForOfStatementIncludes */, node, outermostLabeledStatement, compilerOptions.downlevelIteration ? convertForOfStatementForIterable : convertForOfStatementForArray);
         }
         function convertForOfStatementHead(node, boundValue, convertedLoopBodyStatements) {
             var statements = [];
             var initializer = node.initializer;
             if (ts.isVariableDeclarationList(initializer)) {
-                if (node.initializer.flags & 3) {
+                if (node.initializer.flags & 3 /* BlockScoped */) {
                     enableSubstitutionsForBlockScopedBindings();
                 }
                 var firstOriginalDeclaration = ts.firstOrUndefined(initializer.declarations);
                 if (firstOriginalDeclaration && ts.isBindingPattern(firstOriginalDeclaration.name)) {
-                    var declarations = ts.flattenDestructuringBinding(firstOriginalDeclaration, visitor, context, 0, boundValue);
+                    // This works whether the declaration is a var, let, or const.
+                    // It will use rhsIterationValue _a[_i] as the initializer.
+                    var declarations = ts.flattenDestructuringBinding(firstOriginalDeclaration, visitor, context, 0 /* All */, boundValue);
                     var declarationList = ts.setTextRange(ts.createVariableDeclarationList(declarations), node.initializer);
                     ts.setOriginalNode(declarationList, node.initializer);
+                    // Adjust the source map range for the first declaration to align with the old
+                    // emitter.
                     ts.setSourceMapRange(declarationList, ts.createRange(declarations[0].pos, ts.last(declarations).end));
-                    statements.push(ts.createVariableStatement(undefined, declarationList));
+                    statements.push(ts.createVariableStatement(
+                    /*modifiers*/ undefined, declarationList));
                 }
                 else {
-                    statements.push(ts.setTextRange(ts.createVariableStatement(undefined, ts.setOriginalNode(ts.setTextRange(ts.createVariableDeclarationList([
-                        ts.createVariableDeclaration(firstOriginalDeclaration ? firstOriginalDeclaration.name : ts.createTempVariable(undefined), undefined, boundValue)
+                    // The following call does not include the initializer, so we have
+                    // to emit it separately.
+                    statements.push(ts.setTextRange(ts.createVariableStatement(
+                    /*modifiers*/ undefined, ts.setOriginalNode(ts.setTextRange(ts.createVariableDeclarationList([
+                        ts.createVariableDeclaration(firstOriginalDeclaration ? firstOriginalDeclaration.name : ts.createTempVariable(/*recordTempVariable*/ undefined), 
+                        /*type*/ undefined, boundValue)
                     ]), ts.moveRangePos(initializer, -1)), initializer)), ts.moveRangeEnd(initializer, -1)));
                 }
             }
             else {
+                // Initializer is an expression. Emit the expression in the body, so that it's
+                // evaluated on every iteration.
                 var assignment = ts.createAssignment(initializer, boundValue);
                 if (ts.isDestructuringAssignment(assignment)) {
                     ts.aggregateTransformFlags(assignment);
-                    statements.push(ts.createStatement(visitBinaryExpression(assignment, false)));
+                    statements.push(ts.createStatement(visitBinaryExpression(assignment, /*needsDestructuringValue*/ false)));
                 }
                 else {
                     assignment.end = initializer.end;
@@ -54770,62 +67409,111 @@ var ts;
             }
         }
         function createSyntheticBlockForConvertedStatements(statements) {
-            return ts.setEmitFlags(ts.createBlock(ts.createNodeArray(statements), true), 48 | 384);
+            return ts.setEmitFlags(ts.createBlock(ts.createNodeArray(statements), 
+            /*multiLine*/ true), 48 /* NoSourceMap */ | 384 /* NoTokenSourceMaps */);
         }
         function convertForOfStatementForArray(node, outermostLabeledStatement, convertedLoopBodyStatements) {
+            // The following ES6 code:
+            //
+            //    for (let v of expr) { }
+            //
+            // should be emitted as
+            //
+            //    for (var _i = 0, _a = expr; _i < _a.length; _i++) {
+            //        var v = _a[_i];
+            //    }
+            //
+            // where _a and _i are temps emitted to capture the RHS and the counter,
+            // respectively.
+            // When the left hand side is an expression instead of a let declaration,
+            // the "let v" is not emitted.
+            // When the left hand side is a let/const, the v is renamed if there is
+            // another v in scope.
+            // Note that all assignments to the LHS are emitted in the body, including
+            // all destructuring.
+            // Note also that because an extra statement is needed to assign to the LHS,
+            // for-of bodies are always emitted as blocks.
             var expression = ts.visitNode(node.expression, visitor, ts.isExpression);
+            // In the case where the user wrote an identifier as the RHS, like this:
+            //
+            //     for (let v of arr) { }
+            //
+            // we don't want to emit a temporary variable for the RHS, just use it directly.
             var counter = ts.createLoopVariable();
-            var rhsReference = ts.isIdentifier(expression) ? ts.getGeneratedNameForNode(expression) : ts.createTempVariable(undefined);
-            ts.setEmitFlags(expression, 48 | ts.getEmitFlags(expression));
-            var forStatement = ts.setTextRange(ts.createFor(ts.setEmitFlags(ts.setTextRange(ts.createVariableDeclarationList([
-                ts.setTextRange(ts.createVariableDeclaration(counter, undefined, ts.createLiteral(0)), ts.moveRangePos(node.expression, -1)),
-                ts.setTextRange(ts.createVariableDeclaration(rhsReference, undefined, expression), node.expression)
-            ]), node.expression), 2097152), ts.setTextRange(ts.createLessThan(counter, ts.createPropertyAccess(rhsReference, "length")), node.expression), ts.setTextRange(ts.createPostfixIncrement(counter), node.expression), convertForOfStatementHead(node, ts.createElementAccess(rhsReference, counter), convertedLoopBodyStatements)), node);
-            ts.setEmitFlags(forStatement, 256);
+            var rhsReference = ts.isIdentifier(expression) ? ts.getGeneratedNameForNode(expression) : ts.createTempVariable(/*recordTempVariable*/ undefined);
+            // The old emitter does not emit source maps for the expression
+            ts.setEmitFlags(expression, 48 /* NoSourceMap */ | ts.getEmitFlags(expression));
+            var forStatement = ts.setTextRange(ts.createFor(
+            /*initializer*/ ts.setEmitFlags(ts.setTextRange(ts.createVariableDeclarationList([
+                ts.setTextRange(ts.createVariableDeclaration(counter, /*type*/ undefined, ts.createLiteral(0)), ts.moveRangePos(node.expression, -1)),
+                ts.setTextRange(ts.createVariableDeclaration(rhsReference, /*type*/ undefined, expression), node.expression)
+            ]), node.expression), 2097152 /* NoHoisting */), 
+            /*condition*/ ts.setTextRange(ts.createLessThan(counter, ts.createPropertyAccess(rhsReference, "length")), node.expression), 
+            /*incrementor*/ ts.setTextRange(ts.createPostfixIncrement(counter), node.expression), 
+            /*statement*/ convertForOfStatementHead(node, ts.createElementAccess(rhsReference, counter), convertedLoopBodyStatements)), 
+            /*location*/ node);
+            // Disable trailing source maps for the OpenParenToken to align source map emit with the old emitter.
+            ts.setEmitFlags(forStatement, 256 /* NoTokenTrailingSourceMaps */);
             ts.setTextRange(forStatement, node);
             return ts.restoreEnclosingLabel(forStatement, outermostLabeledStatement, convertedLoopState && resetLabel);
         }
         function convertForOfStatementForIterable(node, outermostLabeledStatement, convertedLoopBodyStatements) {
             var expression = ts.visitNode(node.expression, visitor, ts.isExpression);
-            var iterator = ts.isIdentifier(expression) ? ts.getGeneratedNameForNode(expression) : ts.createTempVariable(undefined);
-            var result = ts.isIdentifier(expression) ? ts.getGeneratedNameForNode(iterator) : ts.createTempVariable(undefined);
+            var iterator = ts.isIdentifier(expression) ? ts.getGeneratedNameForNode(expression) : ts.createTempVariable(/*recordTempVariable*/ undefined);
+            var result = ts.isIdentifier(expression) ? ts.getGeneratedNameForNode(iterator) : ts.createTempVariable(/*recordTempVariable*/ undefined);
             var errorRecord = ts.createUniqueName("e");
             var catchVariable = ts.getGeneratedNameForNode(errorRecord);
-            var returnMethod = ts.createTempVariable(undefined);
+            var returnMethod = ts.createTempVariable(/*recordTempVariable*/ undefined);
             var values = ts.createValuesHelper(context, expression, node.expression);
-            var next = ts.createCall(ts.createPropertyAccess(iterator, "next"), undefined, []);
+            var next = ts.createCall(ts.createPropertyAccess(iterator, "next"), /*typeArguments*/ undefined, []);
             hoistVariableDeclaration(errorRecord);
             hoistVariableDeclaration(returnMethod);
-            var forStatement = ts.setEmitFlags(ts.setTextRange(ts.createFor(ts.setEmitFlags(ts.setTextRange(ts.createVariableDeclarationList([
-                ts.setTextRange(ts.createVariableDeclaration(iterator, undefined, values), node.expression),
-                ts.createVariableDeclaration(result, undefined, next)
-            ]), node.expression), 2097152), ts.createLogicalNot(ts.createPropertyAccess(result, "done")), ts.createAssignment(result, next), convertForOfStatementHead(node, ts.createPropertyAccess(result, "value"), convertedLoopBodyStatements)), node), 256);
+            var forStatement = ts.setEmitFlags(ts.setTextRange(ts.createFor(
+            /*initializer*/ ts.setEmitFlags(ts.setTextRange(ts.createVariableDeclarationList([
+                ts.setTextRange(ts.createVariableDeclaration(iterator, /*type*/ undefined, values), node.expression),
+                ts.createVariableDeclaration(result, /*type*/ undefined, next)
+            ]), node.expression), 2097152 /* NoHoisting */), 
+            /*condition*/ ts.createLogicalNot(ts.createPropertyAccess(result, "done")), 
+            /*incrementor*/ ts.createAssignment(result, next), 
+            /*statement*/ convertForOfStatementHead(node, ts.createPropertyAccess(result, "value"), convertedLoopBodyStatements)), 
+            /*location*/ node), 256 /* NoTokenTrailingSourceMaps */);
             return ts.createTry(ts.createBlock([
                 ts.restoreEnclosingLabel(forStatement, outermostLabeledStatement, convertedLoopState && resetLabel)
             ]), ts.createCatchClause(ts.createVariableDeclaration(catchVariable), ts.setEmitFlags(ts.createBlock([
                 ts.createStatement(ts.createAssignment(errorRecord, ts.createObjectLiteral([
                     ts.createPropertyAssignment("error", catchVariable)
                 ])))
-            ]), 1)), ts.createBlock([
-                ts.createTry(ts.createBlock([
-                    ts.setEmitFlags(ts.createIf(ts.createLogicalAnd(ts.createLogicalAnd(result, ts.createLogicalNot(ts.createPropertyAccess(result, "done"))), ts.createAssignment(returnMethod, ts.createPropertyAccess(iterator, "return"))), ts.createStatement(ts.createFunctionCall(returnMethod, iterator, []))), 1),
-                ]), undefined, ts.setEmitFlags(ts.createBlock([
-                    ts.setEmitFlags(ts.createIf(errorRecord, ts.createThrow(ts.createPropertyAccess(errorRecord, "error"))), 1)
-                ]), 1))
+            ]), 1 /* SingleLine */)), ts.createBlock([
+                ts.createTry(
+                /*tryBlock*/ ts.createBlock([
+                    ts.setEmitFlags(ts.createIf(ts.createLogicalAnd(ts.createLogicalAnd(result, ts.createLogicalNot(ts.createPropertyAccess(result, "done"))), ts.createAssignment(returnMethod, ts.createPropertyAccess(iterator, "return"))), ts.createStatement(ts.createFunctionCall(returnMethod, iterator, []))), 1 /* SingleLine */),
+                ]), 
+                /*catchClause*/ undefined, 
+                /*finallyBlock*/ ts.setEmitFlags(ts.createBlock([
+                    ts.setEmitFlags(ts.createIf(errorRecord, ts.createThrow(ts.createPropertyAccess(errorRecord, "error"))), 1 /* SingleLine */)
+                ]), 1 /* SingleLine */))
             ]));
         }
+        /**
+         * Visits an ObjectLiteralExpression with computed property names.
+         *
+         * @param node An ObjectLiteralExpression node.
+         */
         function visitObjectLiteralExpression(node) {
+            // We are here because a ComputedPropertyName was used somewhere in the expression.
             var properties = node.properties;
             var numProperties = properties.length;
+            // Find the first computed property.
+            // Everything until that point can be emitted as part of the initial object literal.
             var numInitialProperties = numProperties;
             var numInitialPropertiesWithoutYield = numProperties;
             for (var i = 0; i < numProperties; i++) {
                 var property = properties[i];
-                if ((property.transformFlags & 16777216 && hierarchyFacts & 4)
+                if ((property.transformFlags & 16777216 /* ContainsYield */ && hierarchyFacts & 4 /* AsyncFunctionBody */)
                     && i < numInitialPropertiesWithoutYield) {
                     numInitialPropertiesWithoutYield = i;
                 }
-                if (property.name.kind === 147) {
+                if (property.name.kind === 147 /* ComputedPropertyName */) {
                     numInitialProperties = i;
                     break;
                 }
@@ -54834,29 +67522,37 @@ var ts;
                 if (numInitialPropertiesWithoutYield < numInitialProperties) {
                     numInitialProperties = numInitialPropertiesWithoutYield;
                 }
+                // For computed properties, we need to create a unique handle to the object
+                // literal so we can modify it without risking internal assignments tainting the object.
                 var temp = ts.createTempVariable(hoistVariableDeclaration);
+                // Write out the first non-computed properties, then emit the rest through indexing on the temp variable.
                 var expressions = [];
-                var assignment = ts.createAssignment(temp, ts.setEmitFlags(ts.createObjectLiteral(ts.visitNodes(properties, visitor, ts.isObjectLiteralElementLike, 0, numInitialProperties), node.multiLine), 65536));
+                var assignment = ts.createAssignment(temp, ts.setEmitFlags(ts.createObjectLiteral(ts.visitNodes(properties, visitor, ts.isObjectLiteralElementLike, 0, numInitialProperties), node.multiLine), 65536 /* Indented */));
                 if (node.multiLine) {
                     ts.startOnNewLine(assignment);
                 }
                 expressions.push(assignment);
                 addObjectLiteralMembers(expressions, node, temp, numInitialProperties);
+                // We need to clone the temporary identifier so that we can write it on a
+                // new line
                 expressions.push(node.multiLine ? ts.startOnNewLine(ts.getMutableClone(temp)) : temp);
                 return ts.inlineExpressions(expressions);
             }
             return ts.visitEachChild(node, visitor, context);
         }
         function shouldConvertIterationStatementBody(node) {
-            return (resolver.getNodeCheckFlags(node) & 65536) !== 0;
+            return (resolver.getNodeCheckFlags(node) & 65536 /* LoopWithCapturedBlockScopedBinding */) !== 0;
         }
+        /**
+         * Records constituents of name for the given variable to be hoisted in the outer scope.
+         */
         function hoistVariableDeclarationDeclaredInConvertedLoop(state, node) {
             if (!state.hoistedLocalVariables) {
                 state.hoistedLocalVariables = [];
             }
             visit(node.name);
             function visit(node) {
-                if (node.kind === 71) {
+                if (node.kind === 71 /* Identifier */) {
                     state.hoistedLocalVariables.push(node);
                 }
                 else {
@@ -54873,11 +67569,13 @@ var ts;
             if (!shouldConvertIterationStatementBody(node)) {
                 var saveAllowedNonLabeledJumps = void 0;
                 if (convertedLoopState) {
+                    // we get here if we are trying to emit normal loop loop inside converted loop
+                    // set allowedNonLabeledJumps to Break | Continue to mark that break\continue inside the loop should be emitted as is
                     saveAllowedNonLabeledJumps = convertedLoopState.allowedNonLabeledJumps;
-                    convertedLoopState.allowedNonLabeledJumps = 2 | 4;
+                    convertedLoopState.allowedNonLabeledJumps = 2 /* Break */ | 4 /* Continue */;
                 }
                 var result = convert
-                    ? convert(node, outermostLabeledStatement, undefined)
+                    ? convert(node, outermostLabeledStatement, /*convertedLoopBodyStatements*/ undefined)
                     : ts.restoreEnclosingLabel(ts.visitEachChild(node, visitor, context), outermostLabeledStatement, convertedLoopState && resetLabel);
                 if (convertedLoopState) {
                     convertedLoopState.allowedNonLabeledJumps = saveAllowedNonLabeledJumps;
@@ -54887,18 +67585,20 @@ var ts;
             var functionName = ts.createUniqueName("_loop");
             var loopInitializer;
             switch (node.kind) {
-                case 220:
-                case 221:
-                case 222:
+                case 220 /* ForStatement */:
+                case 221 /* ForInStatement */:
+                case 222 /* ForOfStatement */:
                     var initializer = node.initializer;
-                    if (initializer && initializer.kind === 233) {
+                    if (initializer && initializer.kind === 233 /* VariableDeclarationList */) {
                         loopInitializer = initializer;
                     }
                     break;
             }
+            // variables that will be passed to the loop as parameters
             var loopParameters = [];
+            // variables declared in the loop initializer that will be changed inside the loop
             var loopOutParameters = [];
-            if (loopInitializer && (ts.getCombinedNodeFlags(loopInitializer) & 3)) {
+            if (loopInitializer && (ts.getCombinedNodeFlags(loopInitializer) & 3 /* BlockScoped */)) {
                 for (var _i = 0, _a = loopInitializer.declarations; _i < _a.length; _i++) {
                     var decl = _a[_i];
                     processLoopVariableDeclaration(decl, loopParameters, loopOutParameters);
@@ -54907,13 +67607,21 @@ var ts;
             var outerConvertedLoopState = convertedLoopState;
             convertedLoopState = { loopOutParameters: loopOutParameters };
             if (outerConvertedLoopState) {
+                // convertedOuterLoopState !== undefined means that this converted loop is nested in another converted loop.
+                // if outer converted loop has already accumulated some state - pass it through
                 if (outerConvertedLoopState.argumentsName) {
+                    // outer loop has already used 'arguments' so we've already have some name to alias it
+                    // use the same name in all nested loops
                     convertedLoopState.argumentsName = outerConvertedLoopState.argumentsName;
                 }
                 if (outerConvertedLoopState.thisName) {
+                    // outer loop has already used 'this' so we've already have some name to alias it
+                    // use the same name in all nested loops
                     convertedLoopState.thisName = outerConvertedLoopState.thisName;
                 }
                 if (outerConvertedLoopState.hoistedLocalVariables) {
+                    // we've already collected some non-block scoped variable declarations in enclosing loop
+                    // use the same storage in nested loop
                     convertedLoopState.hoistedLocalVariables = outerConvertedLoopState.hoistedLocalVariables;
                 }
             }
@@ -54925,61 +67633,83 @@ var ts;
             if (loopOutParameters.length || lexicalEnvironment) {
                 var statements_4 = ts.isBlock(loopBody) ? loopBody.statements.slice() : [loopBody];
                 if (loopOutParameters.length) {
-                    copyOutParameters(loopOutParameters, 1, statements_4);
+                    copyOutParameters(loopOutParameters, 1 /* ToOutParameter */, statements_4);
                 }
                 ts.prependStatements(statements_4, lexicalEnvironment);
-                loopBody = ts.createBlock(statements_4, true);
+                loopBody = ts.createBlock(statements_4, /*multiline*/ true);
             }
             if (ts.isBlock(loopBody)) {
                 loopBody.multiLine = true;
             }
             else {
-                loopBody = ts.createBlock([loopBody], true);
+                loopBody = ts.createBlock([loopBody], /*multiline*/ true);
             }
-            var containsYield = (node.statement.transformFlags & 16777216) !== 0;
-            var isAsyncBlockContainingAwait = containsYield && (hierarchyFacts & 4) !== 0;
+            var containsYield = (node.statement.transformFlags & 16777216 /* ContainsYield */) !== 0;
+            var isAsyncBlockContainingAwait = containsYield && (hierarchyFacts & 4 /* AsyncFunctionBody */) !== 0;
             var loopBodyFlags = 0;
             if (currentState.containsLexicalThis) {
-                loopBodyFlags |= 8;
+                loopBodyFlags |= 8 /* CapturesThis */;
             }
             if (isAsyncBlockContainingAwait) {
-                loopBodyFlags |= 262144;
+                loopBodyFlags |= 262144 /* AsyncFunctionBody */;
             }
-            var convertedLoopVariable = ts.createVariableStatement(undefined, ts.setEmitFlags(ts.createVariableDeclarationList([
-                ts.createVariableDeclaration(functionName, undefined, ts.setEmitFlags(ts.createFunctionExpression(undefined, containsYield ? ts.createToken(39) : undefined, undefined, undefined, loopParameters, undefined, loopBody), loopBodyFlags))
-            ]), 2097152));
+            var convertedLoopVariable = ts.createVariableStatement(
+            /*modifiers*/ undefined, ts.setEmitFlags(ts.createVariableDeclarationList([
+                ts.createVariableDeclaration(functionName, 
+                /*type*/ undefined, ts.setEmitFlags(ts.createFunctionExpression(
+                /*modifiers*/ undefined, containsYield ? ts.createToken(39 /* AsteriskToken */) : undefined, 
+                /*name*/ undefined, 
+                /*typeParameters*/ undefined, loopParameters, 
+                /*type*/ undefined, loopBody), loopBodyFlags))
+            ]), 2097152 /* NoHoisting */));
             var statements = [convertedLoopVariable];
             var extraVariableDeclarations;
+            // propagate state from the inner loop to the outer loop if necessary
             if (currentState.argumentsName) {
+                // if alias for arguments is set
                 if (outerConvertedLoopState) {
+                    // pass it to outer converted loop
                     outerConvertedLoopState.argumentsName = currentState.argumentsName;
                 }
                 else {
-                    (extraVariableDeclarations || (extraVariableDeclarations = [])).push(ts.createVariableDeclaration(currentState.argumentsName, undefined, ts.createIdentifier("arguments")));
+                    // this is top level converted loop and we need to create an alias for 'arguments' object
+                    (extraVariableDeclarations || (extraVariableDeclarations = [])).push(ts.createVariableDeclaration(currentState.argumentsName, 
+                    /*type*/ undefined, ts.createIdentifier("arguments")));
                 }
             }
             if (currentState.thisName) {
+                // if alias for this is set
                 if (outerConvertedLoopState) {
+                    // pass it to outer converted loop
                     outerConvertedLoopState.thisName = currentState.thisName;
                 }
                 else {
-                    (extraVariableDeclarations || (extraVariableDeclarations = [])).push(ts.createVariableDeclaration(currentState.thisName, undefined, ts.createIdentifier("this")));
+                    // this is top level converted loop so we need to create an alias for 'this' here
+                    // NOTE:
+                    // if converted loops were all nested in arrow function then we'll always emit '_this' so convertedLoopState.thisName will not be set.
+                    // If it is set this means that all nested loops are not nested in arrow function and it is safe to capture 'this'.
+                    (extraVariableDeclarations || (extraVariableDeclarations = [])).push(ts.createVariableDeclaration(currentState.thisName, 
+                    /*type*/ undefined, ts.createIdentifier("this")));
                 }
             }
             if (currentState.hoistedLocalVariables) {
+                // if hoistedLocalVariables !== undefined this means that we've possibly collected some variable declarations to be hoisted later
                 if (outerConvertedLoopState) {
+                    // pass them to outer converted loop
                     outerConvertedLoopState.hoistedLocalVariables = currentState.hoistedLocalVariables;
                 }
                 else {
                     if (!extraVariableDeclarations) {
                         extraVariableDeclarations = [];
                     }
+                    // hoist collected variable declarations
                     for (var _b = 0, _c = currentState.hoistedLocalVariables; _b < _c.length; _b++) {
                         var identifier = _c[_b];
                         extraVariableDeclarations.push(ts.createVariableDeclaration(identifier));
                     }
                 }
             }
+            // add extra variables to hold out parameters if necessary
             if (loopOutParameters.length) {
                 if (!extraVariableDeclarations) {
                     extraVariableDeclarations = [];
@@ -54989,8 +67719,10 @@ var ts;
                     extraVariableDeclarations.push(ts.createVariableDeclaration(outParam.outParamName));
                 }
             }
+            // create variable statement to hold all introduced variable declarations
             if (extraVariableDeclarations) {
-                statements.push(ts.createVariableStatement(undefined, ts.createVariableDeclarationList(extraVariableDeclarations)));
+                statements.push(ts.createVariableStatement(
+                /*modifiers*/ undefined, ts.createVariableDeclarationList(extraVariableDeclarations)));
             }
             var convertedLoopBodyStatements = generateCallToConvertedLoop(functionName, loopParameters, currentState, containsYield);
             var loop;
@@ -54999,9 +67731,13 @@ var ts;
             }
             else {
                 var clone_3 = ts.getMutableClone(node);
+                // clean statement part
                 clone_3.statement = undefined;
+                // visit childnodes to transform initializer/condition/incrementor parts
                 clone_3 = ts.visitEachChild(clone_3, visitor, context);
-                clone_3.statement = ts.createBlock(convertedLoopBodyStatements, true);
+                // set loop statement
+                clone_3.statement = ts.createBlock(convertedLoopBodyStatements, /*multiline*/ true);
+                // reset and re-aggregate the transform flags
                 clone_3.transformFlags = 0;
                 ts.aggregateTransformFlags(clone_3);
                 loop = ts.restoreEnclosingLabel(clone_3, outermostLabeledStatement, convertedLoopState && resetLabel);
@@ -55010,9 +67746,9 @@ var ts;
             return statements;
         }
         function copyOutParameter(outParam, copyDirection) {
-            var source = copyDirection === 0 ? outParam.outParamName : outParam.originalName;
-            var target = copyDirection === 0 ? outParam.originalName : outParam.outParamName;
-            return ts.createBinary(target, 58, source);
+            var source = copyDirection === 0 /* ToOriginal */ ? outParam.outParamName : outParam.originalName;
+            var target = copyDirection === 0 /* ToOriginal */ ? outParam.originalName : outParam.outParamName;
+            return ts.createBinary(target, 58 /* EqualsToken */, source);
         }
         function copyOutParameters(outParams, copyDirection, statements) {
             for (var _i = 0, outParams_1 = outParams; _i < outParams_1.length; _i++) {
@@ -55023,40 +67759,44 @@ var ts;
         function generateCallToConvertedLoop(loopFunctionExpressionName, parameters, state, isAsyncBlockContainingAwait) {
             var outerConvertedLoopState = convertedLoopState;
             var statements = [];
-            var isSimpleLoop = !(state.nonLocalJumps & ~4) &&
+            // loop is considered simple if it does not have any return statements or break\continue that transfer control outside of the loop
+            // simple loops are emitted as just 'loop()';
+            // NOTE: if loop uses only 'continue' it still will be emitted as simple loop
+            var isSimpleLoop = !(state.nonLocalJumps & ~4 /* Continue */) &&
                 !state.labeledNonLocalBreaks &&
                 !state.labeledNonLocalContinues;
-            var call = ts.createCall(loopFunctionExpressionName, undefined, ts.map(parameters, function (p) { return p.name; }));
+            var call = ts.createCall(loopFunctionExpressionName, /*typeArguments*/ undefined, ts.map(parameters, function (p) { return p.name; }));
             var callResult = isAsyncBlockContainingAwait
-                ? ts.createYield(ts.createToken(39), ts.setEmitFlags(call, 8388608))
+                ? ts.createYield(ts.createToken(39 /* AsteriskToken */), ts.setEmitFlags(call, 8388608 /* Iterator */))
                 : call;
             if (isSimpleLoop) {
                 statements.push(ts.createStatement(callResult));
-                copyOutParameters(state.loopOutParameters, 0, statements);
+                copyOutParameters(state.loopOutParameters, 0 /* ToOriginal */, statements);
             }
             else {
                 var loopResultName = ts.createUniqueName("state");
-                var stateVariable = ts.createVariableStatement(undefined, ts.createVariableDeclarationList([ts.createVariableDeclaration(loopResultName, undefined, callResult)]));
+                var stateVariable = ts.createVariableStatement(
+                /*modifiers*/ undefined, ts.createVariableDeclarationList([ts.createVariableDeclaration(loopResultName, /*type*/ undefined, callResult)]));
                 statements.push(stateVariable);
-                copyOutParameters(state.loopOutParameters, 0, statements);
-                if (state.nonLocalJumps & 8) {
+                copyOutParameters(state.loopOutParameters, 0 /* ToOriginal */, statements);
+                if (state.nonLocalJumps & 8 /* Return */) {
                     var returnStatement = void 0;
                     if (outerConvertedLoopState) {
-                        outerConvertedLoopState.nonLocalJumps |= 8;
+                        outerConvertedLoopState.nonLocalJumps |= 8 /* Return */;
                         returnStatement = ts.createReturn(loopResultName);
                     }
                     else {
                         returnStatement = ts.createReturn(ts.createPropertyAccess(loopResultName, "value"));
                     }
-                    statements.push(ts.createIf(ts.createBinary(ts.createTypeOf(loopResultName), 34, ts.createLiteral("object")), returnStatement));
+                    statements.push(ts.createIf(ts.createBinary(ts.createTypeOf(loopResultName), 34 /* EqualsEqualsEqualsToken */, ts.createLiteral("object")), returnStatement));
                 }
-                if (state.nonLocalJumps & 2) {
-                    statements.push(ts.createIf(ts.createBinary(loopResultName, 34, ts.createLiteral("break")), ts.createBreak()));
+                if (state.nonLocalJumps & 2 /* Break */) {
+                    statements.push(ts.createIf(ts.createBinary(loopResultName, 34 /* EqualsEqualsEqualsToken */, ts.createLiteral("break")), ts.createBreak()));
                 }
                 if (state.labeledNonLocalBreaks || state.labeledNonLocalContinues) {
                     var caseClauses = [];
-                    processLabeledJumps(state.labeledNonLocalBreaks, true, loopResultName, outerConvertedLoopState, caseClauses);
-                    processLabeledJumps(state.labeledNonLocalContinues, false, loopResultName, outerConvertedLoopState, caseClauses);
+                    processLabeledJumps(state.labeledNonLocalBreaks, /*isBreak*/ true, loopResultName, outerConvertedLoopState, caseClauses);
+                    processLabeledJumps(state.labeledNonLocalContinues, /*isBreak*/ false, loopResultName, outerConvertedLoopState, caseClauses);
                     statements.push(ts.createSwitch(loopResultName, ts.createCaseBlock(caseClauses)));
                 }
             }
@@ -55082,6 +67822,9 @@ var ts;
             }
             table.forEach(function (labelMarker, labelText) {
                 var statements = [];
+                // if there are no outer converted loop or outer label in question is located inside outer converted loop
+                // then emit labeled break\continue
+                // otherwise propagate pair 'label -> marker' to outer converted loop and emit 'return labelMarker' so outer loop can later decide what to do
                 if (!outerLoop || (outerLoop.labels && outerLoop.labels.get(labelText))) {
                     var label = ts.createIdentifier(labelText);
                     statements.push(isBreak ? ts.createBreak(label) : ts.createContinue(label));
@@ -55104,33 +67847,42 @@ var ts;
                 }
             }
             else {
-                loopParameters.push(ts.createParameter(undefined, undefined, undefined, name));
-                if (resolver.getNodeCheckFlags(decl) & 2097152) {
+                loopParameters.push(ts.createParameter(/*decorators*/ undefined, /*modifiers*/ undefined, /*dotDotDotToken*/ undefined, name));
+                if (resolver.getNodeCheckFlags(decl) & 2097152 /* NeedsLoopOutParameter */) {
                     var outParamName = ts.createUniqueName("out_" + ts.idText(name));
                     loopOutParameters.push({ originalName: name, outParamName: outParamName });
                 }
             }
         }
+        /**
+         * Adds the members of an object literal to an array of expressions.
+         *
+         * @param expressions An array of expressions.
+         * @param node An ObjectLiteralExpression node.
+         * @param receiver The receiver for members of the ObjectLiteralExpression.
+         * @param numInitialNonComputedProperties The number of initial properties without
+         *                                        computed property names.
+         */
         function addObjectLiteralMembers(expressions, node, receiver, start) {
             var properties = node.properties;
             var numProperties = properties.length;
             for (var i = start; i < numProperties; i++) {
                 var property = properties[i];
                 switch (property.kind) {
-                    case 156:
-                    case 157:
+                    case 156 /* GetAccessor */:
+                    case 157 /* SetAccessor */:
                         var accessors = ts.getAllAccessorDeclarations(node.properties, property);
                         if (property === accessors.firstAccessor) {
                             expressions.push(transformAccessorsToExpression(receiver, accessors, node, !!node.multiLine));
                         }
                         break;
-                    case 154:
+                    case 154 /* MethodDeclaration */:
                         expressions.push(transformObjectLiteralMethodDeclarationToExpression(property, receiver, node, node.multiLine));
                         break;
-                    case 270:
+                    case 270 /* PropertyAssignment */:
                         expressions.push(transformPropertyAssignmentToExpression(property, receiver, node.multiLine));
                         break;
-                    case 271:
+                    case 271 /* ShorthandPropertyAssignment */:
                         expressions.push(transformShorthandPropertyAssignmentToExpression(property, receiver, node.multiLine));
                         break;
                     default:
@@ -55139,6 +67891,13 @@ var ts;
                 }
             }
         }
+        /**
+         * Transforms a PropertyAssignment node into an expression.
+         *
+         * @param node The ObjectLiteralExpression that contains the PropertyAssignment.
+         * @param property The PropertyAssignment node.
+         * @param receiver The receiver for the assignment.
+         */
         function transformPropertyAssignmentToExpression(property, receiver, startsOnNewLine) {
             var expression = ts.createAssignment(ts.createMemberAccessForPropertyName(receiver, ts.visitNode(property.name, visitor, ts.isPropertyName)), ts.visitNode(property.initializer, visitor, ts.isExpression));
             ts.setTextRange(expression, property);
@@ -55147,6 +67906,13 @@ var ts;
             }
             return expression;
         }
+        /**
+         * Transforms a ShorthandPropertyAssignment node into an expression.
+         *
+         * @param node The ObjectLiteralExpression that contains the ShorthandPropertyAssignment.
+         * @param property The ShorthandPropertyAssignment node.
+         * @param receiver The receiver for the assignment.
+         */
         function transformShorthandPropertyAssignmentToExpression(property, receiver, startsOnNewLine) {
             var expression = ts.createAssignment(ts.createMemberAccessForPropertyName(receiver, ts.visitNode(property.name, visitor, ts.isPropertyName)), ts.getSynthesizedClone(property.name));
             ts.setTextRange(expression, property);
@@ -55155,103 +67921,201 @@ var ts;
             }
             return expression;
         }
+        /**
+         * Transforms a MethodDeclaration of an ObjectLiteralExpression into an expression.
+         *
+         * @param node The ObjectLiteralExpression that contains the MethodDeclaration.
+         * @param method The MethodDeclaration node.
+         * @param receiver The receiver for the assignment.
+         */
         function transformObjectLiteralMethodDeclarationToExpression(method, receiver, container, startsOnNewLine) {
-            var ancestorFacts = enterSubtree(0, 0);
-            var expression = ts.createAssignment(ts.createMemberAccessForPropertyName(receiver, ts.visitNode(method.name, visitor, ts.isPropertyName)), transformFunctionLikeToExpression(method, method, undefined, container));
+            var ancestorFacts = enterSubtree(0 /* None */, 0 /* None */);
+            var expression = ts.createAssignment(ts.createMemberAccessForPropertyName(receiver, ts.visitNode(method.name, visitor, ts.isPropertyName)), transformFunctionLikeToExpression(method, /*location*/ method, /*name*/ undefined, container));
             ts.setTextRange(expression, method);
             if (startsOnNewLine) {
                 ts.startOnNewLine(expression);
             }
-            exitSubtree(ancestorFacts, 49152, hierarchyFacts & 49152 ? 16384 : 0);
+            exitSubtree(ancestorFacts, 49152 /* PropagateNewTargetMask */, hierarchyFacts & 49152 /* PropagateNewTargetMask */ ? 16384 /* NewTarget */ : 0 /* None */);
             return expression;
         }
         function visitCatchClause(node) {
-            var ancestorFacts = enterSubtree(4032, 0);
+            var ancestorFacts = enterSubtree(4032 /* BlockScopeExcludes */, 0 /* BlockScopeIncludes */);
             var updated;
             ts.Debug.assert(!!node.variableDeclaration, "Catch clause variable should always be present when downleveling ES2015.");
             if (ts.isBindingPattern(node.variableDeclaration.name)) {
-                var temp = ts.createTempVariable(undefined);
+                var temp = ts.createTempVariable(/*recordTempVariable*/ undefined);
                 var newVariableDeclaration = ts.createVariableDeclaration(temp);
                 ts.setTextRange(newVariableDeclaration, node.variableDeclaration);
-                var vars = ts.flattenDestructuringBinding(node.variableDeclaration, visitor, context, 0, temp);
+                var vars = ts.flattenDestructuringBinding(node.variableDeclaration, visitor, context, 0 /* All */, temp);
                 var list = ts.createVariableDeclarationList(vars);
                 ts.setTextRange(list, node.variableDeclaration);
-                var destructure = ts.createVariableStatement(undefined, list);
+                var destructure = ts.createVariableStatement(/*modifiers*/ undefined, list);
                 updated = ts.updateCatchClause(node, newVariableDeclaration, addStatementToStartOfBlock(node.block, destructure));
             }
             else {
                 updated = ts.visitEachChild(node, visitor, context);
             }
-            exitSubtree(ancestorFacts, 0, 0);
+            exitSubtree(ancestorFacts, 0 /* None */, 0 /* None */);
             return updated;
         }
         function addStatementToStartOfBlock(block, statement) {
             var transformedStatements = ts.visitNodes(block.statements, visitor, ts.isStatement);
             return ts.updateBlock(block, [statement].concat(transformedStatements));
         }
+        /**
+         * Visits a MethodDeclaration of an ObjectLiteralExpression and transforms it into a
+         * PropertyAssignment.
+         *
+         * @param node A MethodDeclaration node.
+         */
         function visitMethodDeclaration(node) {
+            // We should only get here for methods on an object literal with regular identifier names.
+            // Methods on classes are handled in visitClassDeclaration/visitClassExpression.
+            // Methods with computed property names are handled in visitObjectLiteralExpression.
             ts.Debug.assert(!ts.isComputedPropertyName(node.name));
-            var functionExpression = transformFunctionLikeToExpression(node, ts.moveRangePos(node, -1), undefined, undefined);
-            ts.setEmitFlags(functionExpression, 512 | ts.getEmitFlags(functionExpression));
-            return ts.setTextRange(ts.createPropertyAssignment(node.name, functionExpression), node);
+            var functionExpression = transformFunctionLikeToExpression(node, /*location*/ ts.moveRangePos(node, -1), /*name*/ undefined, /*container*/ undefined);
+            ts.setEmitFlags(functionExpression, 512 /* NoLeadingComments */ | ts.getEmitFlags(functionExpression));
+            return ts.setTextRange(ts.createPropertyAssignment(node.name, functionExpression), 
+            /*location*/ node);
         }
+        /**
+         * Visits an AccessorDeclaration of an ObjectLiteralExpression.
+         *
+         * @param node An AccessorDeclaration node.
+         */
         function visitAccessorDeclaration(node) {
             ts.Debug.assert(!ts.isComputedPropertyName(node.name));
             var savedConvertedLoopState = convertedLoopState;
             convertedLoopState = undefined;
-            var ancestorFacts = enterSubtree(16286, 65);
+            var ancestorFacts = enterSubtree(16286 /* FunctionExcludes */, 65 /* FunctionIncludes */);
             var updated;
             var parameters = ts.visitParameterList(node.parameters, visitor, context);
-            var body = node.transformFlags & (32768 | 128)
+            var body = node.transformFlags & (32768 /* ContainsCapturedLexicalThis */ | 128 /* ContainsES2015 */)
                 ? transformFunctionBody(node)
                 : visitFunctionBodyDownLevel(node);
-            if (node.kind === 156) {
+            if (node.kind === 156 /* GetAccessor */) {
                 updated = ts.updateGetAccessor(node, node.decorators, node.modifiers, node.name, parameters, node.type, body);
             }
             else {
                 updated = ts.updateSetAccessor(node, node.decorators, node.modifiers, node.name, parameters, body);
             }
-            exitSubtree(ancestorFacts, 49152, 0);
+            exitSubtree(ancestorFacts, 49152 /* PropagateNewTargetMask */, 0 /* None */);
             convertedLoopState = savedConvertedLoopState;
             return updated;
         }
+        /**
+         * Visits a ShorthandPropertyAssignment and transforms it into a PropertyAssignment.
+         *
+         * @param node A ShorthandPropertyAssignment node.
+         */
         function visitShorthandPropertyAssignment(node) {
-            return ts.setTextRange(ts.createPropertyAssignment(node.name, ts.getSynthesizedClone(node.name)), node);
+            return ts.setTextRange(ts.createPropertyAssignment(node.name, ts.getSynthesizedClone(node.name)), 
+            /*location*/ node);
         }
         function visitComputedPropertyName(node) {
-            var ancestorFacts = enterSubtree(0, 8192);
+            var ancestorFacts = enterSubtree(0 /* ComputedPropertyNameExcludes */, 8192 /* ComputedPropertyNameIncludes */);
             var updated = ts.visitEachChild(node, visitor, context);
-            exitSubtree(ancestorFacts, 49152, hierarchyFacts & 49152 ? 32768 : 0);
+            exitSubtree(ancestorFacts, 49152 /* PropagateNewTargetMask */, hierarchyFacts & 49152 /* PropagateNewTargetMask */ ? 32768 /* NewTargetInComputedPropertyName */ : 0 /* None */);
             return updated;
         }
+        /**
+         * Visits a YieldExpression node.
+         *
+         * @param node A YieldExpression node.
+         */
         function visitYieldExpression(node) {
+            // `yield` expressions are transformed using the generators transformer.
             return ts.visitEachChild(node, visitor, context);
         }
+        /**
+         * Visits an ArrayLiteralExpression that contains a spread element.
+         *
+         * @param node An ArrayLiteralExpression node.
+         */
         function visitArrayLiteralExpression(node) {
-            if (node.transformFlags & 64) {
-                return transformAndSpreadElements(node.elements, true, !!node.multiLine, !!node.elements.hasTrailingComma);
+            if (node.transformFlags & 64 /* ES2015 */) {
+                // We are here because we contain a SpreadElementExpression.
+                return transformAndSpreadElements(node.elements, /*needsUniqueCopy*/ true, !!node.multiLine, /*hasTrailingComma*/ !!node.elements.hasTrailingComma);
             }
             return ts.visitEachChild(node, visitor, context);
         }
+        /**
+         * Visits a CallExpression that contains either a spread element or `super`.
+         *
+         * @param node a CallExpression.
+         */
         function visitCallExpression(node) {
-            if (ts.getEmitFlags(node) & 33554432) {
+            if (ts.getEmitFlags(node) & 33554432 /* TypeScriptClassWrapper */) {
                 return visitTypeScriptClassWrapper(node);
             }
-            if (node.transformFlags & 64) {
-                return visitCallExpressionWithPotentialCapturedThisAssignment(node, true);
+            if (node.transformFlags & 64 /* ES2015 */) {
+                return visitCallExpressionWithPotentialCapturedThisAssignment(node, /*assignToCapturedThis*/ true);
             }
-            return ts.updateCall(node, ts.visitNode(node.expression, callExpressionVisitor, ts.isExpression), undefined, ts.visitNodes(node.arguments, visitor, ts.isExpression));
+            return ts.updateCall(node, ts.visitNode(node.expression, callExpressionVisitor, ts.isExpression), 
+            /*typeArguments*/ undefined, ts.visitNodes(node.arguments, visitor, ts.isExpression));
         }
         function visitTypeScriptClassWrapper(node) {
+            // This is a call to a class wrapper function (an IIFE) created by the 'ts' transformer.
+            // The wrapper has a form similar to:
+            //
+            //  (function() {
+            //      class C { // 1
+            //      }
+            //      C.x = 1; // 2
+            //      return C;
+            //  }())
+            //
+            // When we transform the class, we end up with something like this:
+            //
+            //  (function () {
+            //      var C = (function () { // 3
+            //          function C() {
+            //          }
+            //          return C; // 4
+            //      }());
+            //      C.x = 1;
+            //      return C;
+            //  }())
+            //
+            // We want to simplify the two nested IIFEs to end up with something like this:
+            //
+            //  (function () {
+            //      function C() {
+            //      }
+            //      C.x = 1;
+            //      return C;
+            //  }())
+            // We skip any outer expressions in a number of places to get to the innermost
+            // expression, but we will restore them later to preserve comments and source maps.
             var body = ts.cast(ts.cast(ts.skipOuterExpressions(node.expression), ts.isArrowFunction).body, ts.isBlock);
+            // The class statements are the statements generated by visiting the first statement with initializer of the
+            // body (1), while all other statements are added to remainingStatements (2)
             var isVariableStatementWithInitializer = function (stmt) { return ts.isVariableStatement(stmt) && !!ts.first(stmt.declarationList.declarations).initializer; };
             var bodyStatements = ts.visitNodes(body.statements, visitor, ts.isStatement);
             var classStatements = ts.filter(bodyStatements, isVariableStatementWithInitializer);
             var remainingStatements = ts.filter(bodyStatements, function (stmt) { return !isVariableStatementWithInitializer(stmt); });
             var varStatement = ts.cast(ts.first(classStatements), ts.isVariableStatement);
+            // We know there is only one variable declaration here as we verified this in an
+            // earlier call to isTypeScriptClassWrapper
             var variable = varStatement.declarationList.declarations[0];
             var initializer = ts.skipOuterExpressions(variable.initializer);
+            // Under certain conditions, the 'ts' transformer may introduce a class alias, which
+            // we see as an assignment, for example:
+            //
+            //  (function () {
+            //      var C_1;
+            //      var C = C_1 = (function () {
+            //          function C() {
+            //          }
+            //          C.x = function () { return C_1; }
+            //          return C;
+            //      }());
+            //      C = C_1 = __decorate([dec], C);
+            //      return C;
+            //  }())
+            //
             var aliasAssignment = ts.tryCast(initializer, ts.isAssignmentExpression);
+            // The underlying call (3) is another IIFE that may contain a '_super' argument.
             var call = ts.cast(aliasAssignment ? ts.skipOuterExpressions(aliasAssignment.right) : initializer, ts.isCallExpression);
             var func = ts.cast(ts.skipOuterExpressions(call.expression), ts.isFunctionExpression);
             var funcStatements = func.body.statements;
@@ -55259,47 +68123,92 @@ var ts;
             var classBodyEnd = -1;
             var statements = [];
             if (aliasAssignment) {
+                // If we have a class alias assignment, we need to move it to the down-level constructor
+                // function we generated for the class.
                 var extendsCall = ts.tryCast(funcStatements[classBodyStart], ts.isExpressionStatement);
                 if (extendsCall) {
                     statements.push(extendsCall);
                     classBodyStart++;
                 }
+                // The next statement is the function declaration.
                 statements.push(funcStatements[classBodyStart]);
                 classBodyStart++;
+                // Add the class alias following the declaration.
                 statements.push(ts.createStatement(ts.createAssignment(aliasAssignment.left, ts.cast(variable.name, ts.isIdentifier))));
             }
+            // Find the trailing 'return' statement (4)
             while (!ts.isReturnStatement(ts.elementAt(funcStatements, classBodyEnd))) {
                 classBodyEnd--;
             }
+            // When we extract the statements of the inner IIFE, we exclude the 'return' statement (4)
+            // as we already have one that has been introduced by the 'ts' transformer.
             ts.addRange(statements, funcStatements, classBodyStart, classBodyEnd);
             if (classBodyEnd < -1) {
+                // If there were any hoisted declarations following the return statement, we should
+                // append them.
                 ts.addRange(statements, funcStatements, classBodyEnd + 1);
             }
+            // Add the remaining statements of the outer wrapper.
             ts.addRange(statements, remainingStatements);
-            ts.addRange(statements, classStatements, 1);
-            return ts.recreateOuterExpressions(node.expression, ts.recreateOuterExpressions(variable.initializer, ts.recreateOuterExpressions(aliasAssignment && aliasAssignment.right, ts.updateCall(call, ts.recreateOuterExpressions(call.expression, ts.updateFunctionExpression(func, undefined, undefined, undefined, undefined, func.parameters, undefined, ts.updateBlock(func.body, statements))), undefined, call.arguments))));
+            // The 'es2015' class transform may add an end-of-declaration marker. If so we will add it
+            // after the remaining statements from the 'ts' transformer.
+            ts.addRange(statements, classStatements, /*start*/ 1);
+            // Recreate any outer parentheses or partially-emitted expressions to preserve source map
+            // and comment locations.
+            return ts.recreateOuterExpressions(node.expression, ts.recreateOuterExpressions(variable.initializer, ts.recreateOuterExpressions(aliasAssignment && aliasAssignment.right, ts.updateCall(call, ts.recreateOuterExpressions(call.expression, ts.updateFunctionExpression(func, 
+            /*modifiers*/ undefined, 
+            /*asteriskToken*/ undefined, 
+            /*name*/ undefined, 
+            /*typeParameters*/ undefined, func.parameters, 
+            /*type*/ undefined, ts.updateBlock(func.body, statements))), 
+            /*typeArguments*/ undefined, call.arguments))));
         }
         function visitImmediateSuperCallInBody(node) {
-            return visitCallExpressionWithPotentialCapturedThisAssignment(node, false);
+            return visitCallExpressionWithPotentialCapturedThisAssignment(node, /*assignToCapturedThis*/ false);
         }
         function visitCallExpressionWithPotentialCapturedThisAssignment(node, assignToCapturedThis) {
-            if (node.transformFlags & 524288 ||
-                node.expression.kind === 97 ||
+            // We are here either because SuperKeyword was used somewhere in the expression, or
+            // because we contain a SpreadElementExpression.
+            if (node.transformFlags & 524288 /* ContainsSpread */ ||
+                node.expression.kind === 97 /* SuperKeyword */ ||
                 ts.isSuperProperty(ts.skipOuterExpressions(node.expression))) {
                 var _a = ts.createCallBinding(node.expression, hoistVariableDeclaration), target = _a.target, thisArg = _a.thisArg;
-                if (node.expression.kind === 97) {
-                    ts.setEmitFlags(thisArg, 4);
+                if (node.expression.kind === 97 /* SuperKeyword */) {
+                    ts.setEmitFlags(thisArg, 4 /* NoSubstitution */);
                 }
                 var resultingCall = void 0;
-                if (node.transformFlags & 524288) {
-                    resultingCall = ts.createFunctionApply(ts.visitNode(target, callExpressionVisitor, ts.isExpression), ts.visitNode(thisArg, visitor, ts.isExpression), transformAndSpreadElements(node.arguments, false, false, false));
+                if (node.transformFlags & 524288 /* ContainsSpread */) {
+                    // [source]
+                    //      f(...a, b)
+                    //      x.m(...a, b)
+                    //      super(...a, b)
+                    //      super.m(...a, b) // in static
+                    //      super.m(...a, b) // in instance
+                    //
+                    // [output]
+                    //      f.apply(void 0, a.concat([b]))
+                    //      (_a = x).m.apply(_a, a.concat([b]))
+                    //      _super.apply(this, a.concat([b]))
+                    //      _super.m.apply(this, a.concat([b]))
+                    //      _super.prototype.m.apply(this, a.concat([b]))
+                    resultingCall = ts.createFunctionApply(ts.visitNode(target, callExpressionVisitor, ts.isExpression), ts.visitNode(thisArg, visitor, ts.isExpression), transformAndSpreadElements(node.arguments, /*needsUniqueCopy*/ false, /*multiLine*/ false, /*hasTrailingComma*/ false));
                 }
                 else {
-                    resultingCall = ts.createFunctionCall(ts.visitNode(target, callExpressionVisitor, ts.isExpression), ts.visitNode(thisArg, visitor, ts.isExpression), ts.visitNodes(node.arguments, visitor, ts.isExpression), node);
+                    // [source]
+                    //      super(a)
+                    //      super.m(a) // in static
+                    //      super.m(a) // in instance
+                    //
+                    // [output]
+                    //      _super.call(this, a)
+                    //      _super.m.call(this, a)
+                    //      _super.prototype.m.call(this, a)
+                    resultingCall = ts.createFunctionCall(ts.visitNode(target, callExpressionVisitor, ts.isExpression), ts.visitNode(thisArg, visitor, ts.isExpression), ts.visitNodes(node.arguments, visitor, ts.isExpression), 
+                    /*location*/ node);
                 }
-                if (node.expression.kind === 97) {
+                if (node.expression.kind === 97 /* SuperKeyword */) {
                     var actualThis = ts.createThis();
-                    ts.setEmitFlags(actualThis, 4);
+                    ts.setEmitFlags(actualThis, 4 /* NoSubstitution */);
                     var initializer = ts.createLogicalOr(resultingCall, actualThis);
                     resultingCall = assignToCapturedThis
                         ? ts.createAssignment(ts.createFileLevelUniqueName("_this"), initializer)
@@ -55309,14 +68218,40 @@ var ts;
             }
             return ts.visitEachChild(node, visitor, context);
         }
+        /**
+         * Visits a NewExpression that contains a spread element.
+         *
+         * @param node A NewExpression node.
+         */
         function visitNewExpression(node) {
-            if (node.transformFlags & 524288) {
+            if (node.transformFlags & 524288 /* ContainsSpread */) {
+                // We are here because we contain a SpreadElementExpression.
+                // [source]
+                //      new C(...a)
+                //
+                // [output]
+                //      new ((_a = C).bind.apply(_a, [void 0].concat(a)))()
                 var _a = ts.createCallBinding(ts.createPropertyAccess(node.expression, "bind"), hoistVariableDeclaration), target = _a.target, thisArg = _a.thisArg;
-                return ts.createNew(ts.createFunctionApply(ts.visitNode(target, visitor, ts.isExpression), thisArg, transformAndSpreadElements(ts.createNodeArray([ts.createVoidZero()].concat(node.arguments)), false, false, false)), undefined, []);
+                return ts.createNew(ts.createFunctionApply(ts.visitNode(target, visitor, ts.isExpression), thisArg, transformAndSpreadElements(ts.createNodeArray([ts.createVoidZero()].concat(node.arguments)), /*needsUniqueCopy*/ false, /*multiLine*/ false, /*hasTrailingComma*/ false)), 
+                /*typeArguments*/ undefined, []);
             }
             return ts.visitEachChild(node, visitor, context);
         }
+        /**
+         * Transforms an array of Expression nodes that contains a SpreadExpression.
+         *
+         * @param elements The array of Expression nodes.
+         * @param needsUniqueCopy A value indicating whether to ensure that the result is a fresh array.
+         * @param multiLine A value indicating whether the result should be emitted on multiple lines.
+         */
         function transformAndSpreadElements(elements, needsUniqueCopy, multiLine, hasTrailingComma) {
+            // [source]
+            //      [a, ...b, c]
+            //
+            // [output]
+            //      [a].concat(b, [c])
+            // Map spans of spread expressions into their expressions and spans of other
+            // expressions into an array literal.
             var numElements = elements.length;
             var segments = ts.flatten(ts.spanMap(elements, partitionSpread, function (partition, visitPartition, _start, end) {
                 return visitPartition(partition, multiLine, hasTrailingComma && end === numElements);
@@ -55326,7 +68261,7 @@ var ts;
                     var firstSegment = segments[0];
                     if (ts.isCallExpression(firstSegment)
                         && ts.isIdentifier(firstSegment.expression)
-                        && (ts.getEmitFlags(firstSegment.expression) & 4096)
+                        && (ts.getEmitFlags(firstSegment.expression) & 4096 /* HelperName */)
                         && firstSegment.expression.escapedText === "___spread") {
                         return segments[0];
                     }
@@ -55336,10 +68271,11 @@ var ts;
             else {
                 if (segments.length === 1) {
                     var firstElement = elements[0];
-                    return needsUniqueCopy && ts.isSpreadElement(firstElement) && firstElement.expression.kind !== 183
+                    return needsUniqueCopy && ts.isSpreadElement(firstElement) && firstElement.expression.kind !== 183 /* ArrayLiteralExpression */
                         ? ts.createArraySlice(segments[0])
                         : segments[0];
                 }
+                // Rewrite using the pattern <segment0>.concat(<segment1>, <segment2>, ...)
                 return ts.createArrayConcat(segments.shift(), segments);
             }
         }
@@ -55357,26 +68293,55 @@ var ts;
         function visitSpreadElement(node) {
             return ts.visitNode(node.expression, visitor, ts.isExpression);
         }
+        /**
+         * Transforms the expression of a SpreadExpression node.
+         *
+         * @param node A SpreadExpression node.
+         */
         function visitExpressionOfSpread(node) {
             return ts.visitNode(node.expression, visitor, ts.isExpression);
         }
+        /**
+         * Visits a template literal.
+         *
+         * @param node A template literal.
+         */
         function visitTemplateLiteral(node) {
             return ts.setTextRange(ts.createLiteral(node.text), node);
         }
+        /**
+         * Visits a string literal with an extended unicode escape.
+         *
+         * @param node A string literal.
+         */
         function visitStringLiteral(node) {
             if (node.hasExtendedUnicodeEscape) {
                 return ts.setTextRange(ts.createLiteral(node.text), node);
             }
             return node;
         }
+        /**
+         * Visits a binary or octal (ES6) numeric literal.
+         *
+         * @param node A string literal.
+         */
         function visitNumericLiteral(node) {
-            if (node.numericLiteralFlags & 384) {
+            if (node.numericLiteralFlags & 384 /* BinaryOrOctalSpecifier */) {
                 return ts.setTextRange(ts.createNumericLiteral(node.text), node);
             }
             return node;
         }
+        /**
+         * Visits a TaggedTemplateExpression node.
+         *
+         * @param node A TaggedTemplateExpression node.
+         */
         function visitTaggedTemplateExpression(node) {
+            // Visit the tag expression
             var tag = ts.visitNode(node.tag, visitor, ts.isExpression);
+            // Build up the template arguments and the raw and cooked strings for the template.
+            // We start out with 'undefined' for the first argument and revisit later
+            // to avoid walking over the template string twice and shifting all our arguments over after the fact.
             var templateArguments = [undefined];
             var cookedStrings = [];
             var rawStrings = [];
@@ -55396,6 +68361,9 @@ var ts;
                 }
             }
             var helperCall = createTemplateObjectHelper(context, ts.createArrayLiteral(cookedStrings), ts.createArrayLiteral(rawStrings));
+            // Create a variable to cache the template object if we're in a module.
+            // Do not do this in the global scope, as any variable we currently generate could conflict with
+            // variables from outside of the current compilation. In the future, we can revisit this behavior.
             if (ts.isExternalModule(currentSourceFile)) {
                 var tempVar = ts.createUniqueName("templateObject");
                 recordTaggedTemplateString(tempVar);
@@ -55404,19 +68372,48 @@ var ts;
             else {
                 templateArguments[0] = helperCall;
             }
-            return ts.createCall(tag, undefined, templateArguments);
+            return ts.createCall(tag, /*typeArguments*/ undefined, templateArguments);
         }
+        /**
+         * Creates an ES5 compatible literal from an ES6 template literal.
+         *
+         * @param node The ES6 template literal.
+         */
         function getRawLiteral(node) {
+            // Find original source text, since we need to emit the raw strings of the tagged template.
+            // The raw strings contain the (escaped) strings of what the user wrote.
+            // Examples: `\n` is converted to "\\n", a template string with a newline to "\n".
             var text = ts.getSourceTextOfNodeFromSourceFile(currentSourceFile, node);
-            var isLast = node.kind === 13 || node.kind === 16;
+            // text contains the original source, it will also contain quotes ("`"), dolar signs and braces ("${" and "}"),
+            // thus we need to remove those characters.
+            // First template piece starts with "`", others with "}"
+            // Last template piece ends with "`", others with "${"
+            var isLast = node.kind === 13 /* NoSubstitutionTemplateLiteral */ || node.kind === 16 /* TemplateTail */;
             text = text.substring(1, text.length - (isLast ? 1 : 2));
+            // Newline normalization:
+            // ES6 Spec 11.8.6.1 - Static Semantics of TV's and TRV's
+            // <CR><LF> and <CR> LineTerminatorSequences are normalized to <LF> for both TV and TRV.
             text = text.replace(/\r\n?/g, "\n");
             return ts.setTextRange(ts.createLiteral(text), node);
         }
+        /**
+         * Visits a TemplateExpression node.
+         *
+         * @param node A TemplateExpression node.
+         */
         function visitTemplateExpression(node) {
             var expressions = [];
             addTemplateHead(expressions, node);
             addTemplateSpans(expressions, node);
+            // createAdd will check if each expression binds less closely than binary '+'.
+            // If it does, it wraps the expression in parentheses. Otherwise, something like
+            //    `abc${ 1 << 2 }`
+            // becomes
+            //    "abc" + 1 << 2 + ""
+            // which is really
+            //    ("abc" + 1) << (2 + "")
+            // rather than
+            //    "abc" + (1 << 2) + ""
             var expression = ts.reduceLeft(expressions, ts.createAdd);
             if (ts.nodeIsSynthesized(expression)) {
                 expression.pos = node.pos;
@@ -55424,76 +68421,137 @@ var ts;
             }
             return expression;
         }
+        /**
+         * Gets a value indicating whether we need to include the head of a TemplateExpression.
+         *
+         * @param node A TemplateExpression node.
+         */
         function shouldAddTemplateHead(node) {
+            // If this expression has an empty head literal and the first template span has a non-empty
+            // literal, then emitting the empty head literal is not necessary.
+            //     `${ foo } and ${ bar }`
+            // can be emitted as
+            //     foo + " and " + bar
+            // This is because it is only required that one of the first two operands in the emit
+            // output must be a string literal, so that the other operand and all following operands
+            // are forced into strings.
+            //
+            // If the first template span has an empty literal, then the head must still be emitted.
+            //     `${ foo }${ bar }`
+            // must still be emitted as
+            //     "" + foo + bar
+            // There is always atleast one templateSpan in this code path, since
+            // NoSubstitutionTemplateLiterals are directly emitted via emitLiteral()
             ts.Debug.assert(node.templateSpans.length !== 0);
             return node.head.text.length !== 0 || node.templateSpans[0].literal.text.length === 0;
         }
+        /**
+         * Adds the head of a TemplateExpression to an array of expressions.
+         *
+         * @param expressions An array of expressions.
+         * @param node A TemplateExpression node.
+         */
         function addTemplateHead(expressions, node) {
             if (!shouldAddTemplateHead(node)) {
                 return;
             }
             expressions.push(ts.createLiteral(node.head.text));
         }
+        /**
+         * Visits and adds the template spans of a TemplateExpression to an array of expressions.
+         *
+         * @param expressions An array of expressions.
+         * @param node A TemplateExpression node.
+         */
         function addTemplateSpans(expressions, node) {
             for (var _i = 0, _a = node.templateSpans; _i < _a.length; _i++) {
                 var span = _a[_i];
                 expressions.push(ts.visitNode(span.expression, visitor, ts.isExpression));
+                // Only emit if the literal is non-empty.
+                // The binary '+' operator is left-associative, so the first string concatenation
+                // with the head will force the result up to this point to be a string.
+                // Emitting a '+ ""' has no semantic effect for middles and tails.
                 if (span.literal.text.length !== 0) {
                     expressions.push(ts.createLiteral(span.literal.text));
                 }
             }
         }
+        /**
+         * Visits the `super` keyword
+         */
         function visitSuperKeyword(isExpressionOfCall) {
-            return hierarchyFacts & 8
+            return hierarchyFacts & 8 /* NonStaticClassElement */
                 && !isExpressionOfCall
                 ? ts.createPropertyAccess(ts.createFileLevelUniqueName("_super"), "prototype")
                 : ts.createFileLevelUniqueName("_super");
         }
         function visitMetaProperty(node) {
-            if (node.keywordToken === 94 && node.name.escapedText === "target") {
-                if (hierarchyFacts & 8192) {
-                    hierarchyFacts |= 32768;
+            if (node.keywordToken === 94 /* NewKeyword */ && node.name.escapedText === "target") {
+                if (hierarchyFacts & 8192 /* ComputedPropertyName */) {
+                    hierarchyFacts |= 32768 /* NewTargetInComputedPropertyName */;
                 }
                 else {
-                    hierarchyFacts |= 16384;
+                    hierarchyFacts |= 16384 /* NewTarget */;
                 }
                 return ts.createFileLevelUniqueName("_newTarget");
             }
             return node;
         }
+        /**
+         * Called by the printer just before a node is printed.
+         *
+         * @param hint A hint as to the intended usage of the node.
+         * @param node The node to be printed.
+         * @param emitCallback The callback used to emit the node.
+         */
         function onEmitNode(hint, node, emitCallback) {
-            if (enabledSubstitutions & 1 && ts.isFunctionLike(node)) {
-                var ancestorFacts = enterSubtree(16286, ts.getEmitFlags(node) & 8
-                    ? 65 | 16
-                    : 65);
+            if (enabledSubstitutions & 1 /* CapturedThis */ && ts.isFunctionLike(node)) {
+                // If we are tracking a captured `this`, keep track of the enclosing function.
+                var ancestorFacts = enterSubtree(16286 /* FunctionExcludes */, ts.getEmitFlags(node) & 8 /* CapturesThis */
+                    ? 65 /* FunctionIncludes */ | 16 /* CapturesThis */
+                    : 65 /* FunctionIncludes */);
                 previousOnEmitNode(hint, node, emitCallback);
-                exitSubtree(ancestorFacts, 0, 0);
+                exitSubtree(ancestorFacts, 0 /* None */, 0 /* None */);
                 return;
             }
             previousOnEmitNode(hint, node, emitCallback);
         }
+        /**
+         * Enables a more costly code path for substitutions when we determine a source file
+         * contains block-scoped bindings (e.g. `let` or `const`).
+         */
         function enableSubstitutionsForBlockScopedBindings() {
-            if ((enabledSubstitutions & 2) === 0) {
-                enabledSubstitutions |= 2;
-                context.enableSubstitution(71);
+            if ((enabledSubstitutions & 2 /* BlockScopedBindings */) === 0) {
+                enabledSubstitutions |= 2 /* BlockScopedBindings */;
+                context.enableSubstitution(71 /* Identifier */);
             }
         }
+        /**
+         * Enables a more costly code path for substitutions when we determine a source file
+         * contains a captured `this`.
+         */
         function enableSubstitutionsForCapturedThis() {
-            if ((enabledSubstitutions & 1) === 0) {
-                enabledSubstitutions |= 1;
-                context.enableSubstitution(99);
-                context.enableEmitNotification(155);
-                context.enableEmitNotification(154);
-                context.enableEmitNotification(156);
-                context.enableEmitNotification(157);
-                context.enableEmitNotification(193);
-                context.enableEmitNotification(192);
-                context.enableEmitNotification(234);
+            if ((enabledSubstitutions & 1 /* CapturedThis */) === 0) {
+                enabledSubstitutions |= 1 /* CapturedThis */;
+                context.enableSubstitution(99 /* ThisKeyword */);
+                context.enableEmitNotification(155 /* Constructor */);
+                context.enableEmitNotification(154 /* MethodDeclaration */);
+                context.enableEmitNotification(156 /* GetAccessor */);
+                context.enableEmitNotification(157 /* SetAccessor */);
+                context.enableEmitNotification(193 /* ArrowFunction */);
+                context.enableEmitNotification(192 /* FunctionExpression */);
+                context.enableEmitNotification(234 /* FunctionDeclaration */);
             }
         }
+        /**
+         * Hooks node substitutions.
+         *
+         * @param hint The context for the emitter.
+         * @param node The node to substitute.
+         */
         function onSubstituteNode(hint, node) {
             node = previousOnSubstituteNode(hint, node);
-            if (hint === 1) {
+            if (hint === 1 /* Expression */) {
                 return substituteExpression(node);
             }
             if (ts.isIdentifier(node)) {
@@ -55501,8 +68559,13 @@ var ts;
             }
             return node;
         }
+        /**
+         * Hooks substitutions for non-expression identifiers.
+         */
         function substituteIdentifier(node) {
-            if (enabledSubstitutions & 2 && !ts.isInternalName(node)) {
+            // Only substitute the identifier if we have enabled substitutions for block-scoped
+            // bindings.
+            if (enabledSubstitutions & 2 /* BlockScopedBindings */ && !ts.isInternalName(node)) {
                 var original = ts.getParseTreeNode(node, ts.isIdentifier);
                 if (original && isNameOfDeclarationWithCollidingName(original)) {
                     return ts.setTextRange(ts.getGeneratedNameForNode(original), node);
@@ -55510,28 +68573,44 @@ var ts;
             }
             return node;
         }
+        /**
+         * Determines whether a name is the name of a declaration with a colliding name.
+         * NOTE: This function expects to be called with an original source tree node.
+         *
+         * @param node An original source tree node.
+         */
         function isNameOfDeclarationWithCollidingName(node) {
             switch (node.parent.kind) {
-                case 182:
-                case 235:
-                case 238:
-                case 232:
+                case 182 /* BindingElement */:
+                case 235 /* ClassDeclaration */:
+                case 238 /* EnumDeclaration */:
+                case 232 /* VariableDeclaration */:
                     return node.parent.name === node
                         && resolver.isDeclarationWithCollidingName(node.parent);
             }
             return false;
         }
+        /**
+         * Substitutes an expression.
+         *
+         * @param node An Expression node.
+         */
         function substituteExpression(node) {
             switch (node.kind) {
-                case 71:
+                case 71 /* Identifier */:
                     return substituteExpressionIdentifier(node);
-                case 99:
+                case 99 /* ThisKeyword */:
                     return substituteThisKeyword(node);
             }
             return node;
         }
+        /**
+         * Substitutes an expression identifier.
+         *
+         * @param node An Identifier node.
+         */
         function substituteExpressionIdentifier(node) {
-            if (enabledSubstitutions & 2 && !ts.isInternalName(node)) {
+            if (enabledSubstitutions & 2 /* BlockScopedBindings */ && !ts.isInternalName(node)) {
                 var declaration = resolver.getReferencedDeclarationWithCollidingName(node);
                 if (declaration && !(ts.isClassLike(declaration) && isPartOfClassBody(declaration, node))) {
                     return ts.setTextRange(ts.getGeneratedNameForNode(ts.getNameOfDeclaration(declaration)), node);
@@ -55542,11 +68621,17 @@ var ts;
         function isPartOfClassBody(declaration, node) {
             var currentNode = ts.getParseTreeNode(node);
             if (!currentNode || currentNode === declaration || currentNode.end <= declaration.pos || currentNode.pos >= declaration.end) {
+                // if the node has no correlation to a parse tree node, its definitely not
+                // part of the body.
+                // if the node is outside of the document range of the declaration, its
+                // definitely not part of the body.
                 return false;
             }
             var blockScope = ts.getEnclosingBlockScopeContainer(declaration);
             while (currentNode) {
                 if (currentNode === blockScope || currentNode === declaration) {
+                    // if we are in the enclosing block scope of the declaration, we are definitely
+                    // not inside the class body.
                     return false;
                 }
                 if (ts.isClassElement(currentNode) && currentNode.parent === declaration) {
@@ -55556,15 +68641,20 @@ var ts;
             }
             return false;
         }
+        /**
+         * Substitutes `this` when contained within an arrow function.
+         *
+         * @param node The ThisKeyword node.
+         */
         function substituteThisKeyword(node) {
-            if (enabledSubstitutions & 1
-                && hierarchyFacts & 16) {
+            if (enabledSubstitutions & 1 /* CapturedThis */
+                && hierarchyFacts & 16 /* CapturesThis */) {
                 return ts.setTextRange(ts.createFileLevelUniqueName("_this"), node);
             }
             return node;
         }
         function getClassMemberPrefix(node, member) {
-            return ts.hasModifier(member, 32)
+            return ts.hasModifier(member, 32 /* Static */)
                 ? ts.getInternalName(node)
                 : ts.createPropertyAccess(ts.getInternalName(node), "prototype");
         }
@@ -55576,19 +68666,19 @@ var ts;
                 return false;
             }
             var statement = ts.firstOrUndefined(constructor.body.statements);
-            if (!statement || !ts.nodeIsSynthesized(statement) || statement.kind !== 216) {
+            if (!statement || !ts.nodeIsSynthesized(statement) || statement.kind !== 216 /* ExpressionStatement */) {
                 return false;
             }
             var statementExpression = statement.expression;
-            if (!ts.nodeIsSynthesized(statementExpression) || statementExpression.kind !== 187) {
+            if (!ts.nodeIsSynthesized(statementExpression) || statementExpression.kind !== 187 /* CallExpression */) {
                 return false;
             }
             var callTarget = statementExpression.expression;
-            if (!ts.nodeIsSynthesized(callTarget) || callTarget.kind !== 97) {
+            if (!ts.nodeIsSynthesized(callTarget) || callTarget.kind !== 97 /* SuperKeyword */) {
                 return false;
             }
             var callArgument = ts.singleOrUndefined(statementExpression.arguments);
-            if (!callArgument || !ts.nodeIsSynthesized(callArgument) || callArgument.kind !== 204) {
+            if (!callArgument || !ts.nodeIsSynthesized(callArgument) || callArgument.kind !== 204 /* SpreadElement */) {
                 return false;
             }
             var expression = callArgument.expression;
@@ -55598,14 +68688,16 @@ var ts;
     ts.transformES2015 = transformES2015;
     function createExtendsHelper(context, name) {
         context.requestEmitHelper(extendsHelper);
-        return ts.createCall(ts.getHelperName("__extends"), undefined, [
+        return ts.createCall(ts.getHelperName("__extends"), 
+        /*typeArguments*/ undefined, [
             name,
             ts.createFileLevelUniqueName("_super")
         ]);
     }
     function createTemplateObjectHelper(context, cooked, raw) {
         context.requestEmitHelper(templateObjectHelper);
-        return ts.createCall(ts.getHelperName("__makeTemplateObject"), undefined, [
+        return ts.createCall(ts.getHelperName("__makeTemplateObject"), 
+        /*typeArguments*/ undefined, [
             cooked,
             raw
         ]);
@@ -55623,39 +68715,64 @@ var ts;
         text: "\n            var __makeTemplateObject = (this && this.__makeTemplateObject) || function (cooked, raw) {\n                if (Object.defineProperty) { Object.defineProperty(cooked, \"raw\", { value: raw }); } else { cooked.raw = raw; }\n                return cooked;\n            };"
     };
 })(ts || (ts = {}));
+/*@internal*/
 var ts;
 (function (ts) {
+    /**
+     * Transforms ES5 syntax into ES3 syntax.
+     *
+     * @param context Context and state information for the transformation.
+     */
     function transformES5(context) {
         var compilerOptions = context.getCompilerOptions();
+        // enable emit notification only if using --jsx preserve or react-native
         var previousOnEmitNode;
         var noSubstitution;
-        if (compilerOptions.jsx === 1 || compilerOptions.jsx === 3) {
+        if (compilerOptions.jsx === 1 /* Preserve */ || compilerOptions.jsx === 3 /* ReactNative */) {
             previousOnEmitNode = context.onEmitNode;
             context.onEmitNode = onEmitNode;
-            context.enableEmitNotification(257);
-            context.enableEmitNotification(258);
-            context.enableEmitNotification(256);
+            context.enableEmitNotification(257 /* JsxOpeningElement */);
+            context.enableEmitNotification(258 /* JsxClosingElement */);
+            context.enableEmitNotification(256 /* JsxSelfClosingElement */);
             noSubstitution = [];
         }
         var previousOnSubstituteNode = context.onSubstituteNode;
         context.onSubstituteNode = onSubstituteNode;
-        context.enableSubstitution(185);
-        context.enableSubstitution(270);
+        context.enableSubstitution(185 /* PropertyAccessExpression */);
+        context.enableSubstitution(270 /* PropertyAssignment */);
         return ts.chainBundle(transformSourceFile);
+        /**
+         * Transforms an ES5 source file to ES3.
+         *
+         * @param node A SourceFile
+         */
         function transformSourceFile(node) {
             return node;
         }
+        /**
+         * Called by the printer just before a node is printed.
+         *
+         * @param hint A hint as to the intended usage of the node.
+         * @param node The node to emit.
+         * @param emitCallback A callback used to emit the node.
+         */
         function onEmitNode(hint, node, emitCallback) {
             switch (node.kind) {
-                case 257:
-                case 258:
-                case 256:
+                case 257 /* JsxOpeningElement */:
+                case 258 /* JsxClosingElement */:
+                case 256 /* JsxSelfClosingElement */:
                     var tagName = node.tagName;
                     noSubstitution[ts.getOriginalNodeId(tagName)] = true;
                     break;
             }
             previousOnEmitNode(hint, node, emitCallback);
         }
+        /**
+         * Hooks node substitutions.
+         *
+         * @param hint A hint as to the intended usage of the node.
+         * @param node The node to substitute.
+         */
         function onSubstituteNode(hint, node) {
             if (node.id && noSubstitution && noSubstitution[node.id]) {
                 return previousOnSubstituteNode(hint, node);
@@ -55669,6 +68786,11 @@ var ts;
             }
             return node;
         }
+        /**
+         * Substitutes a PropertyAccessExpression whose name is a reserved word.
+         *
+         * @param node A PropertyAccessExpression
+         */
         function substitutePropertyAccessExpression(node) {
             var literalName = trySubstituteReservedName(node.name);
             if (literalName) {
@@ -55676,6 +68798,11 @@ var ts;
             }
             return node;
         }
+        /**
+         * Substitutes a PropertyAssignment whose name is a reserved word.
+         *
+         * @param node A PropertyAssignment
+         */
         function substitutePropertyAssignment(node) {
             var literalName = ts.isIdentifier(node.name) && trySubstituteReservedName(node.name);
             if (literalName) {
@@ -55683,9 +68810,14 @@ var ts;
             }
             return node;
         }
+        /**
+         * If an identifier name is a reserved word, returns a string literal for the name.
+         *
+         * @param name An Identifier
+         */
         function trySubstituteReservedName(name) {
             var token = name.originalKeywordKind || (ts.nodeIsSynthesized(name) ? ts.stringToToken(ts.idText(name)) : undefined);
-            if (token !== undefined && token >= 72 && token <= 107) {
+            if (token !== undefined && token >= 72 /* FirstReservedWord */ && token <= 107 /* LastReservedWord */) {
                 return ts.setTextRange(ts.createLiteral(name), name);
             }
             return undefined;
@@ -55693,6 +68825,125 @@ var ts;
     }
     ts.transformES5 = transformES5;
 })(ts || (ts = {}));
+// Transforms generator functions into a compatible ES5 representation with similar runtime
+// semantics. This is accomplished by first transforming the body of each generator
+// function into an intermediate representation that is the compiled into a JavaScript
+// switch statement.
+//
+// Many functions in this transformer will contain comments indicating the expected
+// intermediate representation. For illustrative purposes, the following intermediate
+// language is used to define this intermediate representation:
+//
+//  .nop                            - Performs no operation.
+//  .local NAME, ...                - Define local variable declarations.
+//  .mark LABEL                     - Mark the location of a label.
+//  .br LABEL                       - Jump to a label. If jumping out of a protected
+//                                    region, all .finally blocks are executed.
+//  .brtrue LABEL, (x)              - Jump to a label IIF the expression `x` is truthy.
+//                                    If jumping out of a protected region, all .finally
+//                                    blocks are executed.
+//  .brfalse LABEL, (x)             - Jump to a label IIF the expression `x` is falsey.
+//                                    If jumping out of a protected region, all .finally
+//                                    blocks are executed.
+//  .yield (x)                      - Yield the value of the optional expression `x`.
+//                                    Resume at the next label.
+//  .yieldstar (x)                  - Delegate yield to the value of the optional
+//                                    expression `x`. Resume at the next label.
+//                                    NOTE: `x` must be an Iterator, not an Iterable.
+//  .loop CONTINUE, BREAK           - Marks the beginning of a loop. Any "continue" or
+//                                    "break" abrupt completions jump to the CONTINUE or
+//                                    BREAK labels, respectively.
+//  .endloop                        - Marks the end of a loop.
+//  .with (x)                       - Marks the beginning of a WithStatement block, using
+//                                    the supplied expression.
+//  .endwith                        - Marks the end of a WithStatement.
+//  .switch                         - Marks the beginning of a SwitchStatement.
+//  .endswitch                      - Marks the end of a SwitchStatement.
+//  .labeled NAME                   - Marks the beginning of a LabeledStatement with the
+//                                    supplied name.
+//  .endlabeled                     - Marks the end of a LabeledStatement.
+//  .try TRY, CATCH, FINALLY, END   - Marks the beginning of a protected region, and the
+//                                    labels for each block.
+//  .catch (x)                      - Marks the beginning of a catch block.
+//  .finally                        - Marks the beginning of a finally block.
+//  .endfinally                     - Marks the end of a finally block.
+//  .endtry                         - Marks the end of a protected region.
+//  .throw (x)                      - Throws the value of the expression `x`.
+//  .return (x)                     - Returns the value of the expression `x`.
+//
+// In addition, the illustrative intermediate representation introduces some special
+// variables:
+//
+//  %sent%                          - Either returns the next value sent to the generator,
+//                                    returns the result of a delegated yield, or throws
+//                                    the exception sent to the generator.
+//  %error%                         - Returns the value of the current exception in a
+//                                    catch block.
+//
+// This intermediate representation is then compiled into JavaScript syntax. The resulting
+// compilation output looks something like the following:
+//
+//  function f() {
+//      var /*locals*/;
+//      /*functions*/
+//      return __generator(function (state) {
+//          switch (state.label) {
+//              /*cases per label*/
+//          }
+//      });
+//  }
+//
+// Each of the above instructions corresponds to JavaScript emit similar to the following:
+//
+//  .local NAME                   | var NAME;
+// -------------------------------|----------------------------------------------
+//  .mark LABEL                   | case LABEL:
+// -------------------------------|----------------------------------------------
+//  .br LABEL                     |     return [3 /*break*/, LABEL];
+// -------------------------------|----------------------------------------------
+//  .brtrue LABEL, (x)            |     if (x) return [3 /*break*/, LABEL];
+// -------------------------------|----------------------------------------------
+//  .brfalse LABEL, (x)           |     if (!(x)) return [3, /*break*/, LABEL];
+// -------------------------------|----------------------------------------------
+//  .yield (x)                    |     return [4 /*yield*/, x];
+//  .mark RESUME                  | case RESUME:
+//      a = %sent%;               |     a = state.sent();
+// -------------------------------|----------------------------------------------
+//  .yieldstar (x)                |     return [5 /*yield**/, x];
+//  .mark RESUME                  | case RESUME:
+//      a = %sent%;               |     a = state.sent();
+// -------------------------------|----------------------------------------------
+//  .with (_a)                    |     with (_a) {
+//      a();                      |         a();
+//                                |     }
+//                                |     state.label = LABEL;
+//  .mark LABEL                   | case LABEL:
+//                                |     with (_a) {
+//      b();                      |         b();
+//                                |     }
+//  .endwith                      |
+// -------------------------------|----------------------------------------------
+//                                | case 0:
+//                                |     state.trys = [];
+//                                | ...
+//  .try TRY, CATCH, FINALLY, END |
+//  .mark TRY                     | case TRY:
+//                                |     state.trys.push([TRY, CATCH, FINALLY, END]);
+//  .nop                          |
+//      a();                      |     a();
+//  .br END                       |     return [3 /*break*/, END];
+//  .catch (e)                    |
+//  .mark CATCH                   | case CATCH:
+//                                |     e = state.sent();
+//      b();                      |     b();
+//  .br END                       |     return [3 /*break*/, END];
+//  .finally                      |
+//  .mark FINALLY                 | case FINALLY:
+//      c();                      |     c();
+//  .endfinally                   |     return [7 /*endfinally*/];
+//  .endtry                       |
+//  .mark END                     | case END:
+/*@internal*/
 var ts;
 (function (ts) {
     var OpCode;
@@ -55707,13 +68958,15 @@ var ts;
         OpCode[OpCode["YieldStar"] = 7] = "YieldStar";
         OpCode[OpCode["Return"] = 8] = "Return";
         OpCode[OpCode["Throw"] = 9] = "Throw";
-        OpCode[OpCode["Endfinally"] = 10] = "Endfinally";
+        OpCode[OpCode["Endfinally"] = 10] = "Endfinally"; // Marks the end of a `finally` block
     })(OpCode || (OpCode = {}));
+    // whether a generated code block is opening or closing at the current operation for a FunctionBuilder
     var BlockAction;
     (function (BlockAction) {
         BlockAction[BlockAction["Open"] = 0] = "Open";
         BlockAction[BlockAction["Close"] = 1] = "Close";
     })(BlockAction || (BlockAction = {}));
+    // the kind for a generated code block in a FunctionBuilder
     var CodeBlockKind;
     (function (CodeBlockKind) {
         CodeBlockKind[CodeBlockKind["Exception"] = 0] = "Exception";
@@ -55722,6 +68975,7 @@ var ts;
         CodeBlockKind[CodeBlockKind["Loop"] = 3] = "Loop";
         CodeBlockKind[CodeBlockKind["Labeled"] = 4] = "Labeled";
     })(CodeBlockKind || (CodeBlockKind = {}));
+    // the state for a generated code exception block
     var ExceptionBlockState;
     (function (ExceptionBlockState) {
         ExceptionBlockState[ExceptionBlockState["Try"] = 0] = "Try";
@@ -55729,6 +68983,7 @@ var ts;
         ExceptionBlockState[ExceptionBlockState["Finally"] = 2] = "Finally";
         ExceptionBlockState[ExceptionBlockState["Done"] = 3] = "Done";
     })(ExceptionBlockState || (ExceptionBlockState = {}));
+    // NOTE: changes to this enum should be reflected in the __generator helper.
     var Instruction;
     (function (Instruction) {
         Instruction[Instruction["Next"] = 0] = "Next";
@@ -55742,12 +68997,12 @@ var ts;
     })(Instruction || (Instruction = {}));
     function getInstructionName(instruction) {
         switch (instruction) {
-            case 2: return "return";
-            case 3: return "break";
-            case 4: return "yield";
-            case 5: return "yield*";
-            case 7: return "endfinally";
-            default: return undefined;
+            case 2 /* Return */: return "return";
+            case 3 /* Break */: return "break";
+            case 4 /* Yield */: return "yield";
+            case 5 /* YieldStar */: return "yield*";
+            case 7 /* Endfinally */: return "endfinally";
+            default: return undefined; // TODO: GH#18217
         }
     }
     function transformGenerators(context) {
@@ -55761,36 +69016,57 @@ var ts;
         var renamedCatchVariableDeclarations;
         var inGeneratorFunctionBody;
         var inStatementContainingYield;
-        var blocks;
-        var blockOffsets;
-        var blockActions;
-        var blockStack;
-        var labelOffsets;
-        var labelExpressions;
-        var nextLabelId = 1;
-        var operations;
-        var operationArguments;
-        var operationLocations;
-        var state;
-        var blockIndex = 0;
-        var labelNumber = 0;
+        // The following three arrays store information about generated code blocks.
+        // All three arrays are correlated by their index. This approach is used over allocating
+        // objects to store the same information to avoid GC overhead.
+        //
+        var blocks; // Information about the code block
+        var blockOffsets; // The operation offset at which a code block begins or ends
+        var blockActions; // Whether the code block is opened or closed
+        var blockStack; // A stack of currently open code blocks
+        // Labels are used to mark locations in the code that can be the target of a Break (jump)
+        // operation. These are translated into case clauses in a switch statement.
+        // The following two arrays are correlated by their index. This approach is used over
+        // allocating objects to store the same information to avoid GC overhead.
+        //
+        var labelOffsets; // The operation offset at which the label is defined.
+        var labelExpressions; // The NumericLiteral nodes bound to each label.
+        var nextLabelId = 1; // The next label id to use.
+        // Operations store information about generated code for the function body. This
+        // Includes things like statements, assignments, breaks (jumps), and yields.
+        // The following three arrays are correlated by their index. This approach is used over
+        // allocating objects to store the same information to avoid GC overhead.
+        //
+        var operations; // The operation to perform.
+        var operationArguments; // The arguments to the operation.
+        var operationLocations; // The source map location for the operation.
+        var state; // The name of the state object used by the generator at runtime.
+        // The following variables store information used by the `build` function:
+        //
+        var blockIndex = 0; // The index of the current block.
+        var labelNumber = 0; // The current label number.
         var labelNumbers;
-        var lastOperationWasAbrupt;
-        var lastOperationWasCompletion;
-        var clauses;
-        var statements;
-        var exceptionBlockStack;
-        var currentExceptionBlock;
-        var withBlockStack;
+        var lastOperationWasAbrupt; // Indicates whether the last operation was abrupt (break/continue).
+        var lastOperationWasCompletion; // Indicates whether the last operation was a completion (return/throw).
+        var clauses; // The case clauses generated for labels.
+        var statements; // The statements for the current label.
+        var exceptionBlockStack; // A stack of containing exception blocks.
+        var currentExceptionBlock; // The current exception block.
+        var withBlockStack; // A stack containing `with` blocks.
         return ts.chainBundle(transformSourceFile);
         function transformSourceFile(node) {
-            if (node.isDeclarationFile || (node.transformFlags & 512) === 0) {
+            if (node.isDeclarationFile || (node.transformFlags & 512 /* ContainsGenerator */) === 0) {
                 return node;
             }
             var visited = ts.visitEachChild(node, visitor, context);
             ts.addEmitHelpers(visited, context.readEmitHelpers());
             return visited;
         }
+        /**
+         * Visits a node.
+         *
+         * @param node The node to visit.
+         */
         function visitor(node) {
             var transformFlags = node.transformFlags;
             if (inStatementContainingYield) {
@@ -55799,56 +69075,66 @@ var ts;
             else if (inGeneratorFunctionBody) {
                 return visitJavaScriptInGeneratorFunctionBody(node);
             }
-            else if (transformFlags & 256) {
+            else if (transformFlags & 256 /* Generator */) {
                 return visitGenerator(node);
             }
-            else if (transformFlags & 512) {
+            else if (transformFlags & 512 /* ContainsGenerator */) {
                 return ts.visitEachChild(node, visitor, context);
             }
             else {
                 return node;
             }
         }
+        /**
+         * Visits a node that is contained within a statement that contains yield.
+         *
+         * @param node The node to visit.
+         */
         function visitJavaScriptInStatementContainingYield(node) {
             switch (node.kind) {
-                case 218:
+                case 218 /* DoStatement */:
                     return visitDoStatement(node);
-                case 219:
+                case 219 /* WhileStatement */:
                     return visitWhileStatement(node);
-                case 227:
+                case 227 /* SwitchStatement */:
                     return visitSwitchStatement(node);
-                case 228:
+                case 228 /* LabeledStatement */:
                     return visitLabeledStatement(node);
                 default:
                     return visitJavaScriptInGeneratorFunctionBody(node);
             }
         }
+        /**
+         * Visits a node that is contained within a generator function.
+         *
+         * @param node The node to visit.
+         */
         function visitJavaScriptInGeneratorFunctionBody(node) {
             switch (node.kind) {
-                case 234:
+                case 234 /* FunctionDeclaration */:
                     return visitFunctionDeclaration(node);
-                case 192:
+                case 192 /* FunctionExpression */:
                     return visitFunctionExpression(node);
-                case 156:
-                case 157:
+                case 156 /* GetAccessor */:
+                case 157 /* SetAccessor */:
                     return visitAccessorDeclaration(node);
-                case 214:
+                case 214 /* VariableStatement */:
                     return visitVariableStatement(node);
-                case 220:
+                case 220 /* ForStatement */:
                     return visitForStatement(node);
-                case 221:
+                case 221 /* ForInStatement */:
                     return visitForInStatement(node);
-                case 224:
+                case 224 /* BreakStatement */:
                     return visitBreakStatement(node);
-                case 223:
+                case 223 /* ContinueStatement */:
                     return visitContinueStatement(node);
-                case 225:
+                case 225 /* ReturnStatement */:
                     return visitReturnStatement(node);
                 default:
-                    if (node.transformFlags & 16777216) {
+                    if (node.transformFlags & 16777216 /* ContainsYield */) {
                         return visitJavaScriptContainingYield(node);
                     }
-                    else if (node.transformFlags & (512 | 33554432)) {
+                    else if (node.transformFlags & (512 /* ContainsGenerator */ | 33554432 /* ContainsHoistedDeclarationOrCompletion */)) {
                         return ts.visitEachChild(node, visitor, context);
                     }
                     else {
@@ -55856,41 +69142,66 @@ var ts;
                     }
             }
         }
+        /**
+         * Visits a node that contains a YieldExpression.
+         *
+         * @param node The node to visit.
+         */
         function visitJavaScriptContainingYield(node) {
             switch (node.kind) {
-                case 200:
+                case 200 /* BinaryExpression */:
                     return visitBinaryExpression(node);
-                case 201:
+                case 201 /* ConditionalExpression */:
                     return visitConditionalExpression(node);
-                case 203:
+                case 203 /* YieldExpression */:
                     return visitYieldExpression(node);
-                case 183:
+                case 183 /* ArrayLiteralExpression */:
                     return visitArrayLiteralExpression(node);
-                case 184:
+                case 184 /* ObjectLiteralExpression */:
                     return visitObjectLiteralExpression(node);
-                case 186:
+                case 186 /* ElementAccessExpression */:
                     return visitElementAccessExpression(node);
-                case 187:
+                case 187 /* CallExpression */:
                     return visitCallExpression(node);
-                case 188:
+                case 188 /* NewExpression */:
                     return visitNewExpression(node);
                 default:
                     return ts.visitEachChild(node, visitor, context);
             }
         }
+        /**
+         * Visits a generator function.
+         *
+         * @param node The node to visit.
+         */
         function visitGenerator(node) {
             switch (node.kind) {
-                case 234:
+                case 234 /* FunctionDeclaration */:
                     return visitFunctionDeclaration(node);
-                case 192:
+                case 192 /* FunctionExpression */:
                     return visitFunctionExpression(node);
                 default:
                     return ts.Debug.failBadSyntaxKind(node);
             }
         }
+        /**
+         * Visits a function declaration.
+         *
+         * This will be called when one of the following conditions are met:
+         * - The function declaration is a generator function.
+         * - The function declaration is contained within the body of a generator function.
+         *
+         * @param node The node to visit.
+         */
         function visitFunctionDeclaration(node) {
+            // Currently, we only support generators that were originally async functions.
             if (node.asteriskToken) {
-                node = ts.setOriginalNode(ts.setTextRange(ts.createFunctionDeclaration(undefined, node.modifiers, undefined, node.name, undefined, ts.visitParameterList(node.parameters, visitor, context), undefined, transformGeneratorFunctionBody(node.body)), node), node);
+                node = ts.setOriginalNode(ts.setTextRange(ts.createFunctionDeclaration(
+                /*decorators*/ undefined, node.modifiers, 
+                /*asteriskToken*/ undefined, node.name, 
+                /*typeParameters*/ undefined, ts.visitParameterList(node.parameters, visitor, context), 
+                /*type*/ undefined, transformGeneratorFunctionBody(node.body)), 
+                /*location*/ node), node);
             }
             else {
                 var savedInGeneratorFunctionBody = inGeneratorFunctionBody;
@@ -55902,6 +69213,8 @@ var ts;
                 inStatementContainingYield = savedInStatementContainingYield;
             }
             if (inGeneratorFunctionBody) {
+                // Function declarations in a generator function body are hoisted
+                // to the top of the lexical scope and elided from the current statement.
                 hoistFunctionDeclaration(node);
                 return undefined;
             }
@@ -55909,9 +69222,24 @@ var ts;
                 return node;
             }
         }
+        /**
+         * Visits a function expression.
+         *
+         * This will be called when one of the following conditions are met:
+         * - The function expression is a generator function.
+         * - The function expression is contained within the body of a generator function.
+         *
+         * @param node The node to visit.
+         */
         function visitFunctionExpression(node) {
+            // Currently, we only support generators that were originally async functions.
             if (node.asteriskToken) {
-                node = ts.setOriginalNode(ts.setTextRange(ts.createFunctionExpression(undefined, undefined, node.name, undefined, ts.visitParameterList(node.parameters, visitor, context), undefined, transformGeneratorFunctionBody(node.body)), node), node);
+                node = ts.setOriginalNode(ts.setTextRange(ts.createFunctionExpression(
+                /*modifiers*/ undefined, 
+                /*asteriskToken*/ undefined, node.name, 
+                /*typeParameters*/ undefined, ts.visitParameterList(node.parameters, visitor, context), 
+                /*type*/ undefined, transformGeneratorFunctionBody(node.body)), 
+                /*location*/ node), node);
             }
             else {
                 var savedInGeneratorFunctionBody = inGeneratorFunctionBody;
@@ -55924,6 +69252,14 @@ var ts;
             }
             return node;
         }
+        /**
+         * Visits a get or set accessor declaration.
+         *
+         * This will be called when one of the following conditions are met:
+         * - The accessor is contained within the body of a generator function.
+         *
+         * @param node The node to visit.
+         */
         function visitAccessorDeclaration(node) {
             var savedInGeneratorFunctionBody = inGeneratorFunctionBody;
             var savedInStatementContainingYield = inStatementContainingYield;
@@ -55934,7 +69270,13 @@ var ts;
             inStatementContainingYield = savedInStatementContainingYield;
             return node;
         }
+        /**
+         * Transforms the body of a generator function declaration.
+         *
+         * @param node The function body to transform.
+         */
         function transformGeneratorFunctionBody(body) {
+            // Save existing generator state
             var statements = [];
             var savedInGeneratorFunctionBody = inGeneratorFunctionBody;
             var savedInStatementContainingYield = inStatementContainingYield;
@@ -55949,6 +69291,7 @@ var ts;
             var savedOperationArguments = operationArguments;
             var savedOperationLocations = operationLocations;
             var savedState = state;
+            // Initialize generator state
             inGeneratorFunctionBody = true;
             inStatementContainingYield = false;
             blocks = undefined;
@@ -55961,13 +69304,15 @@ var ts;
             operations = undefined;
             operationArguments = undefined;
             operationLocations = undefined;
-            state = ts.createTempVariable(undefined);
+            state = ts.createTempVariable(/*recordTempVariable*/ undefined);
+            // Build the generator
             resumeLexicalEnvironment();
-            var statementOffset = ts.addPrologue(statements, body.statements, false, visitor);
+            var statementOffset = ts.addPrologue(statements, body.statements, /*ensureUseStrict*/ false, visitor);
             transformAndEmitStatements(body.statements, statementOffset);
             var buildResult = build();
             ts.prependStatements(statements, endLexicalEnvironment());
             statements.push(ts.createReturn(buildResult));
+            // Restore previous generator state
             inGeneratorFunctionBody = savedInGeneratorFunctionBody;
             inStatementContainingYield = savedInStatementContainingYield;
             blocks = savedBlocks;
@@ -55983,13 +69328,22 @@ var ts;
             state = savedState;
             return ts.setTextRange(ts.createBlock(statements, body.multiLine), body);
         }
+        /**
+         * Visits a variable statement.
+         *
+         * This will be called when one of the following conditions are met:
+         * - The variable statement is contained within the body of a generator function.
+         *
+         * @param node The node to visit.
+         */
         function visitVariableStatement(node) {
-            if (node.transformFlags & 16777216) {
+            if (node.transformFlags & 16777216 /* ContainsYield */) {
                 transformAndEmitVariableDeclarationList(node.declarationList);
                 return undefined;
             }
             else {
-                if (ts.getEmitFlags(node) & 1048576) {
+                // Do not hoist custom prologues.
+                if (ts.getEmitFlags(node) & 1048576 /* CustomPrologue */) {
                     return node;
                 }
                 for (var _i = 0, _a = node.declarationList.declarations; _i < _a.length; _i++) {
@@ -56003,46 +69357,78 @@ var ts;
                 return ts.setSourceMapRange(ts.createStatement(ts.inlineExpressions(ts.map(variables, transformInitializedVariable))), node);
             }
         }
+        /**
+         * Visits a binary expression.
+         *
+         * This will be called when one of the following conditions are met:
+         * - The node contains a YieldExpression.
+         *
+         * @param node The node to visit.
+         */
         function visitBinaryExpression(node) {
             var assoc = ts.getExpressionAssociativity(node);
             switch (assoc) {
-                case 0:
+                case 0 /* Left */:
                     return visitLeftAssociativeBinaryExpression(node);
-                case 1:
+                case 1 /* Right */:
                     return visitRightAssociativeBinaryExpression(node);
                 default:
                     return ts.Debug.assertNever(assoc);
             }
         }
         function isCompoundAssignment(kind) {
-            return kind >= 59
-                && kind <= 70;
+            return kind >= 59 /* FirstCompoundAssignment */
+                && kind <= 70 /* LastCompoundAssignment */;
         }
         function getOperatorForCompoundAssignment(kind) {
             switch (kind) {
-                case 59: return 37;
-                case 60: return 38;
-                case 61: return 39;
-                case 62: return 40;
-                case 63: return 41;
-                case 64: return 42;
-                case 65: return 45;
-                case 66: return 46;
-                case 67: return 47;
-                case 68: return 48;
-                case 69: return 49;
-                case 70: return 50;
+                case 59 /* PlusEqualsToken */: return 37 /* PlusToken */;
+                case 60 /* MinusEqualsToken */: return 38 /* MinusToken */;
+                case 61 /* AsteriskEqualsToken */: return 39 /* AsteriskToken */;
+                case 62 /* AsteriskAsteriskEqualsToken */: return 40 /* AsteriskAsteriskToken */;
+                case 63 /* SlashEqualsToken */: return 41 /* SlashToken */;
+                case 64 /* PercentEqualsToken */: return 42 /* PercentToken */;
+                case 65 /* LessThanLessThanEqualsToken */: return 45 /* LessThanLessThanToken */;
+                case 66 /* GreaterThanGreaterThanEqualsToken */: return 46 /* GreaterThanGreaterThanToken */;
+                case 67 /* GreaterThanGreaterThanGreaterThanEqualsToken */: return 47 /* GreaterThanGreaterThanGreaterThanToken */;
+                case 68 /* AmpersandEqualsToken */: return 48 /* AmpersandToken */;
+                case 69 /* BarEqualsToken */: return 49 /* BarToken */;
+                case 70 /* CaretEqualsToken */: return 50 /* CaretToken */;
             }
         }
+        /**
+         * Visits a right-associative binary expression containing `yield`.
+         *
+         * @param node The node to visit.
+         */
         function visitRightAssociativeBinaryExpression(node) {
             var left = node.left, right = node.right;
             if (containsYield(right)) {
                 var target = void 0;
                 switch (left.kind) {
-                    case 185:
+                    case 185 /* PropertyAccessExpression */:
+                        // [source]
+                        //      a.b = yield;
+                        //
+                        // [intermediate]
+                        //  .local _a
+                        //      _a = a;
+                        //  .yield resumeLabel
+                        //  .mark resumeLabel
+                        //      _a.b = %sent%;
                         target = ts.updatePropertyAccess(left, cacheExpression(ts.visitNode(left.expression, visitor, ts.isLeftHandSideExpression)), left.name);
                         break;
-                    case 186:
+                    case 186 /* ElementAccessExpression */:
+                        // [source]
+                        //      a[b] = yield;
+                        //
+                        // [intermediate]
+                        //  .local _a, _b
+                        //      _a = a;
+                        //      _b = b;
+                        //  .yield resumeLabel
+                        //  .mark resumeLabel
+                        //      _a[_b] = %sent%;
                         target = ts.updateElementAccess(left, cacheExpression(ts.visitNode(left.expression, visitor, ts.isLeftHandSideExpression)), cacheExpression(ts.visitNode(left.argumentExpression, visitor, ts.isExpression)));
                         break;
                     default:
@@ -56064,9 +69450,17 @@ var ts;
                 if (ts.isLogicalOperator(node.operatorToken.kind)) {
                     return visitLogicalBinaryExpression(node);
                 }
-                else if (node.operatorToken.kind === 26) {
+                else if (node.operatorToken.kind === 26 /* CommaToken */) {
                     return visitCommaExpression(node);
                 }
+                // [source]
+                //      a() + (yield) + c()
+                //
+                // [intermediate]
+                //  .local _a
+                //      _a = a();
+                //  .yield resumeLabel
+                //      _a + %sent% + c()
                 var clone_4 = ts.getMutableClone(node);
                 clone_4.left = cacheExpression(ts.visitNode(node.left, visitor, ts.isExpression));
                 clone_4.right = ts.visitNode(node.right, visitor, ts.isExpression);
@@ -56074,73 +69468,176 @@ var ts;
             }
             return ts.visitEachChild(node, visitor, context);
         }
+        /**
+         * Visits a logical binary expression containing `yield`.
+         *
+         * @param node A node to visit.
+         */
         function visitLogicalBinaryExpression(node) {
+            // Logical binary expressions (`&&` and `||`) are shortcutting expressions and need
+            // to be transformed as such:
+            //
+            // [source]
+            //      x = a() && yield;
+            //
+            // [intermediate]
+            //  .local _a
+            //      _a = a();
+            //  .brfalse resultLabel, (_a)
+            //  .yield resumeLabel
+            //  .mark resumeLabel
+            //      _a = %sent%;
+            //  .mark resultLabel
+            //      x = _a;
+            //
+            // [source]
+            //      x = a() || yield;
+            //
+            // [intermediate]
+            //  .local _a
+            //      _a = a();
+            //  .brtrue resultLabel, (_a)
+            //  .yield resumeLabel
+            //  .mark resumeLabel
+            //      _a = %sent%;
+            //  .mark resultLabel
+            //      x = _a;
             var resultLabel = defineLabel();
             var resultLocal = declareLocal();
-            emitAssignment(resultLocal, ts.visitNode(node.left, visitor, ts.isExpression), node.left);
-            if (node.operatorToken.kind === 53) {
-                emitBreakWhenFalse(resultLabel, resultLocal, node.left);
+            emitAssignment(resultLocal, ts.visitNode(node.left, visitor, ts.isExpression), /*location*/ node.left);
+            if (node.operatorToken.kind === 53 /* AmpersandAmpersandToken */) {
+                // Logical `&&` shortcuts when the left-hand operand is falsey.
+                emitBreakWhenFalse(resultLabel, resultLocal, /*location*/ node.left);
             }
             else {
-                emitBreakWhenTrue(resultLabel, resultLocal, node.left);
+                // Logical `||` shortcuts when the left-hand operand is truthy.
+                emitBreakWhenTrue(resultLabel, resultLocal, /*location*/ node.left);
             }
-            emitAssignment(resultLocal, ts.visitNode(node.right, visitor, ts.isExpression), node.right);
+            emitAssignment(resultLocal, ts.visitNode(node.right, visitor, ts.isExpression), /*location*/ node.right);
             markLabel(resultLabel);
             return resultLocal;
         }
+        /**
+         * Visits a comma expression containing `yield`.
+         *
+         * @param node The node to visit.
+         */
         function visitCommaExpression(node) {
+            // [source]
+            //      x = a(), yield, b();
+            //
+            // [intermediate]
+            //      a();
+            //  .yield resumeLabel
+            //  .mark resumeLabel
+            //      x = %sent%, b();
             var pendingExpressions = [];
             visit(node.left);
             visit(node.right);
             return ts.inlineExpressions(pendingExpressions);
             function visit(node) {
-                if (ts.isBinaryExpression(node) && node.operatorToken.kind === 26) {
+                if (ts.isBinaryExpression(node) && node.operatorToken.kind === 26 /* CommaToken */) {
                     visit(node.left);
                     visit(node.right);
                 }
                 else {
                     if (containsYield(node) && pendingExpressions.length > 0) {
-                        emitWorker(1, [ts.createStatement(ts.inlineExpressions(pendingExpressions))]);
+                        emitWorker(1 /* Statement */, [ts.createStatement(ts.inlineExpressions(pendingExpressions))]);
                         pendingExpressions = [];
                     }
                     pendingExpressions.push(ts.visitNode(node, visitor, ts.isExpression));
                 }
             }
         }
+        /**
+         * Visits a conditional expression containing `yield`.
+         *
+         * @param node The node to visit.
+         */
         function visitConditionalExpression(node) {
+            // [source]
+            //      x = a() ? yield : b();
+            //
+            // [intermediate]
+            //  .local _a
+            //  .brfalse whenFalseLabel, (a())
+            //  .yield resumeLabel
+            //  .mark resumeLabel
+            //      _a = %sent%;
+            //  .br resultLabel
+            //  .mark whenFalseLabel
+            //      _a = b();
+            //  .mark resultLabel
+            //      x = _a;
+            // We only need to perform a specific transformation if a `yield` expression exists
+            // in either the `whenTrue` or `whenFalse` branches.
+            // A `yield` in the condition will be handled by the normal visitor.
             if (containsYield(node.whenTrue) || containsYield(node.whenFalse)) {
                 var whenFalseLabel = defineLabel();
                 var resultLabel = defineLabel();
                 var resultLocal = declareLocal();
-                emitBreakWhenFalse(whenFalseLabel, ts.visitNode(node.condition, visitor, ts.isExpression), node.condition);
-                emitAssignment(resultLocal, ts.visitNode(node.whenTrue, visitor, ts.isExpression), node.whenTrue);
+                emitBreakWhenFalse(whenFalseLabel, ts.visitNode(node.condition, visitor, ts.isExpression), /*location*/ node.condition);
+                emitAssignment(resultLocal, ts.visitNode(node.whenTrue, visitor, ts.isExpression), /*location*/ node.whenTrue);
                 emitBreak(resultLabel);
                 markLabel(whenFalseLabel);
-                emitAssignment(resultLocal, ts.visitNode(node.whenFalse, visitor, ts.isExpression), node.whenFalse);
+                emitAssignment(resultLocal, ts.visitNode(node.whenFalse, visitor, ts.isExpression), /*location*/ node.whenFalse);
                 markLabel(resultLabel);
                 return resultLocal;
             }
             return ts.visitEachChild(node, visitor, context);
         }
+        /**
+         * Visits a `yield` expression.
+         *
+         * @param node The node to visit.
+         */
         function visitYieldExpression(node) {
+            // [source]
+            //      x = yield a();
+            //
+            // [intermediate]
+            //  .yield resumeLabel, (a())
+            //  .mark resumeLabel
+            //      x = %sent%;
             var resumeLabel = defineLabel();
             var expression = ts.visitNode(node.expression, visitor, ts.isExpression);
             if (node.asteriskToken) {
-                var iterator = (ts.getEmitFlags(node.expression) & 8388608) === 0
-                    ? ts.createValuesHelper(context, expression, node)
+                var iterator = (ts.getEmitFlags(node.expression) & 8388608 /* Iterator */) === 0
+                    ? ts.createValuesHelper(context, expression, /*location*/ node)
                     : expression;
-                emitYieldStar(iterator, node);
+                emitYieldStar(iterator, /*location*/ node);
             }
             else {
-                emitYield(expression, node);
+                emitYield(expression, /*location*/ node);
             }
             markLabel(resumeLabel);
-            return createGeneratorResume(node);
+            return createGeneratorResume(/*location*/ node);
         }
+        /**
+         * Visits an ArrayLiteralExpression that contains a YieldExpression.
+         *
+         * @param node The node to visit.
+         */
         function visitArrayLiteralExpression(node) {
-            return visitElements(node.elements, undefined, undefined, node.multiLine);
+            return visitElements(node.elements, /*leadingElement*/ undefined, /*location*/ undefined, node.multiLine);
         }
+        /**
+         * Visits an array of expressions containing one or more YieldExpression nodes
+         * and returns an expression for the resulting value.
+         *
+         * @param elements The elements to visit.
+         * @param multiLine Whether array literals created should be emitted on multiple lines.
+         */
         function visitElements(elements, leadingElement, location, multiLine) {
+            // [source]
+            //      ar = [1, yield, 2];
+            //
+            // [intermediate]
+            //  .local _a
+            //      _a = [1];
+            //  .yield resumeLabel
+            //  .mark resumeLabel
+            //      ar = _a.concat([%sent%, 2]);
             var numInitialElements = countInitialNodesWithoutYield(elements);
             var temp;
             if (numInitialElements > 0) {
@@ -56171,6 +69668,23 @@ var ts;
             }
         }
         function visitObjectLiteralExpression(node) {
+            // [source]
+            //      o = {
+            //          a: 1,
+            //          b: yield,
+            //          c: 2
+            //      };
+            //
+            // [intermediate]
+            //  .local _a
+            //      _a = {
+            //          a: 1
+            //      };
+            //  .yield resumeLabel
+            //  .mark resumeLabel
+            //      o = (_a.b = %sent%,
+            //          _a.c = 2,
+            //          _a);
             var properties = node.properties;
             var multiLine = node.multiLine;
             var numInitialProperties = countInitialNodesWithoutYield(properties);
@@ -56195,8 +69709,22 @@ var ts;
                 return expressions;
             }
         }
+        /**
+         * Visits an ElementAccessExpression that contains a YieldExpression.
+         *
+         * @param node The node to visit.
+         */
         function visitElementAccessExpression(node) {
             if (containsYield(node.argumentExpression)) {
+                // [source]
+                //      a = x[yield];
+                //
+                // [intermediate]
+                //  .local _a
+                //      _a = x;
+                //  .yield resumeLabel
+                //  .mark resumeLabel
+                //      a = _a[%sent%]
                 var clone_5 = ts.getMutableClone(node);
                 clone_5.expression = cacheExpression(ts.visitNode(node.expression, visitor, ts.isLeftHandSideExpression));
                 clone_5.argumentExpression = ts.visitNode(node.argumentExpression, visitor, ts.isExpression);
@@ -56206,15 +69734,38 @@ var ts;
         }
         function visitCallExpression(node) {
             if (!ts.isImportCall(node) && ts.forEach(node.arguments, containsYield)) {
-                var _a = ts.createCallBinding(node.expression, hoistVariableDeclaration, languageVersion, true), target = _a.target, thisArg = _a.thisArg;
-                return ts.setOriginalNode(ts.createFunctionApply(cacheExpression(ts.visitNode(target, visitor, ts.isLeftHandSideExpression)), thisArg, visitElements(node.arguments), node), node);
+                // [source]
+                //      a.b(1, yield, 2);
+                //
+                // [intermediate]
+                //  .local _a, _b, _c
+                //      _b = (_a = a).b;
+                //      _c = [1];
+                //  .yield resumeLabel
+                //  .mark resumeLabel
+                //      _b.apply(_a, _c.concat([%sent%, 2]));
+                var _a = ts.createCallBinding(node.expression, hoistVariableDeclaration, languageVersion, /*cacheIdentifiers*/ true), target = _a.target, thisArg = _a.thisArg;
+                return ts.setOriginalNode(ts.createFunctionApply(cacheExpression(ts.visitNode(target, visitor, ts.isLeftHandSideExpression)), thisArg, visitElements(node.arguments), 
+                /*location*/ node), node);
             }
             return ts.visitEachChild(node, visitor, context);
         }
         function visitNewExpression(node) {
             if (ts.forEach(node.arguments, containsYield)) {
+                // [source]
+                //      new a.b(1, yield, 2);
+                //
+                // [intermediate]
+                //  .local _a, _b, _c
+                //      _b = (_a = a.b).bind;
+                //      _c = [1];
+                //  .yield resumeLabel
+                //  .mark resumeLabel
+                //      new (_b.apply(_a, _c.concat([%sent%, 2])));
                 var _a = ts.createCallBinding(ts.createPropertyAccess(node.expression, "bind"), hoistVariableDeclaration), target = _a.target, thisArg = _a.thisArg;
-                return ts.setOriginalNode(ts.setTextRange(ts.createNew(ts.createFunctionApply(cacheExpression(ts.visitNode(target, visitor, ts.isExpression)), thisArg, visitElements(node.arguments, ts.createVoidZero())), undefined, []), node), node);
+                return ts.setOriginalNode(ts.setTextRange(ts.createNew(ts.createFunctionApply(cacheExpression(ts.visitNode(target, visitor, ts.isExpression)), thisArg, visitElements(node.arguments, 
+                /*leadingElement*/ ts.createVoidZero())), 
+                /*typeArguments*/ undefined, []), node), node);
             }
             return ts.visitEachChild(node, visitor, context);
         }
@@ -56243,35 +69794,35 @@ var ts;
         }
         function transformAndEmitStatementWorker(node) {
             switch (node.kind) {
-                case 213:
+                case 213 /* Block */:
                     return transformAndEmitBlock(node);
-                case 216:
+                case 216 /* ExpressionStatement */:
                     return transformAndEmitExpressionStatement(node);
-                case 217:
+                case 217 /* IfStatement */:
                     return transformAndEmitIfStatement(node);
-                case 218:
+                case 218 /* DoStatement */:
                     return transformAndEmitDoStatement(node);
-                case 219:
+                case 219 /* WhileStatement */:
                     return transformAndEmitWhileStatement(node);
-                case 220:
+                case 220 /* ForStatement */:
                     return transformAndEmitForStatement(node);
-                case 221:
+                case 221 /* ForInStatement */:
                     return transformAndEmitForInStatement(node);
-                case 223:
+                case 223 /* ContinueStatement */:
                     return transformAndEmitContinueStatement(node);
-                case 224:
+                case 224 /* BreakStatement */:
                     return transformAndEmitBreakStatement(node);
-                case 225:
+                case 225 /* ReturnStatement */:
                     return transformAndEmitReturnStatement(node);
-                case 226:
+                case 226 /* WithStatement */:
                     return transformAndEmitWithStatement(node);
-                case 227:
+                case 227 /* SwitchStatement */:
                     return transformAndEmitSwitchStatement(node);
-                case 228:
+                case 228 /* LabeledStatement */:
                     return transformAndEmitLabeledStatement(node);
-                case 229:
+                case 229 /* ThrowStatement */:
                     return transformAndEmitThrowStatement(node);
-                case 230:
+                case 230 /* TryStatement */:
                     return transformAndEmitTryStatement(node);
                 default:
                     return emitStatement(ts.visitNode(node, visitor, ts.isStatement));
@@ -56320,10 +69871,23 @@ var ts;
         }
         function transformAndEmitIfStatement(node) {
             if (containsYield(node)) {
+                // [source]
+                //      if (x)
+                //          /*thenStatement*/
+                //      else
+                //          /*elseStatement*/
+                //
+                // [intermediate]
+                //  .brfalse elseLabel, (x)
+                //      /*thenStatement*/
+                //  .br endLabel
+                //  .mark elseLabel
+                //      /*elseStatement*/
+                //  .mark endLabel
                 if (containsYield(node.thenStatement) || containsYield(node.elseStatement)) {
                     var endLabel = defineLabel();
                     var elseLabel = node.elseStatement ? defineLabel() : undefined;
-                    emitBreakWhenFalse(node.elseStatement ? elseLabel : endLabel, ts.visitNode(node.expression, visitor, ts.isExpression), node.expression);
+                    emitBreakWhenFalse(node.elseStatement ? elseLabel : endLabel, ts.visitNode(node.expression, visitor, ts.isExpression), /*location*/ node.expression);
                     transformAndEmitEmbeddedStatement(node.thenStatement);
                     if (node.elseStatement) {
                         emitBreak(endLabel);
@@ -56342,9 +69906,23 @@ var ts;
         }
         function transformAndEmitDoStatement(node) {
             if (containsYield(node)) {
+                // [source]
+                //      do {
+                //          /*body*/
+                //      }
+                //      while (i < 10);
+                //
+                // [intermediate]
+                //  .loop conditionLabel, endLabel
+                //  .mark loopLabel
+                //      /*body*/
+                //  .mark conditionLabel
+                //  .brtrue loopLabel, (i < 10)
+                //  .endloop
+                //  .mark endLabel
                 var conditionLabel = defineLabel();
                 var loopLabel = defineLabel();
-                beginLoopBlock(conditionLabel);
+                beginLoopBlock(/*continueLabel*/ conditionLabel);
                 markLabel(loopLabel);
                 transformAndEmitEmbeddedStatement(node.statement);
                 markLabel(conditionLabel);
@@ -56368,6 +69946,19 @@ var ts;
         }
         function transformAndEmitWhileStatement(node) {
             if (containsYield(node)) {
+                // [source]
+                //      while (i < 10) {
+                //          /*body*/
+                //      }
+                //
+                // [intermediate]
+                //  .loop loopLabel, endLabel
+                //  .mark loopLabel
+                //  .brfalse endLabel, (i < 10)
+                //      /*body*/
+                //  .br loopLabel
+                //  .endloop
+                //  .mark endLabel
                 var loopLabel = defineLabel();
                 var endLabel = beginLoopBlock(loopLabel);
                 markLabel(loopLabel);
@@ -56393,6 +69984,23 @@ var ts;
         }
         function transformAndEmitForStatement(node) {
             if (containsYield(node)) {
+                // [source]
+                //      for (var i = 0; i < 10; i++) {
+                //          /*body*/
+                //      }
+                //
+                // [intermediate]
+                //  .local i
+                //      i = 0;
+                //  .loop incrementLabel, endLoopLabel
+                //  .mark conditionLabel
+                //  .brfalse endLoopLabel, (i < 10)
+                //      /*body*/
+                //  .mark incrementLabel
+                //      i++;
+                //  .br conditionLabel
+                //  .endloop
+                //  .mark endLoopLabel
                 var conditionLabel = defineLabel();
                 var incrementLabel = defineLabel();
                 var endLabel = beginLoopBlock(incrementLabel);
@@ -56445,14 +70053,36 @@ var ts;
             return node;
         }
         function transformAndEmitForInStatement(node) {
+            // TODO(rbuckton): Source map locations
             if (containsYield(node)) {
-                var keysArray = declareLocal();
-                var key = declareLocal();
-                var keysIndex = ts.createLoopVariable();
+                // [source]
+                //      for (var p in o) {
+                //          /*body*/
+                //      }
+                //
+                // [intermediate]
+                //  .local _a, _b, _i
+                //      _a = [];
+                //      for (_b in o) _a.push(_b);
+                //      _i = 0;
+                //  .loop incrementLabel, endLoopLabel
+                //  .mark conditionLabel
+                //  .brfalse endLoopLabel, (_i < _a.length)
+                //      p = _a[_i];
+                //      /*body*/
+                //  .mark incrementLabel
+                //      _b++;
+                //  .br conditionLabel
+                //  .endloop
+                //  .mark endLoopLabel
+                var keysArray = declareLocal(); // _a
+                var key = declareLocal(); // _b
+                var keysIndex = ts.createLoopVariable(); // _i
                 var initializer = node.initializer;
                 hoistVariableDeclaration(keysIndex);
                 emitAssignment(keysArray, ts.createArrayLiteral());
-                emitStatement(ts.createForIn(key, ts.visitNode(node.expression, visitor, ts.isExpression), ts.createStatement(ts.createCall(ts.createPropertyAccess(keysArray, "push"), undefined, [key]))));
+                emitStatement(ts.createForIn(key, ts.visitNode(node.expression, visitor, ts.isExpression), ts.createStatement(ts.createCall(ts.createPropertyAccess(keysArray, "push"), 
+                /*typeArguments*/ undefined, [key]))));
                 emitAssignment(keysIndex, ts.createLiteral(0));
                 var conditionLabel = defineLabel();
                 var incrementLabel = defineLabel();
@@ -56483,6 +70113,18 @@ var ts;
             }
         }
         function visitForInStatement(node) {
+            // [source]
+            //      for (var x in a) {
+            //          /*body*/
+            //      }
+            //
+            // [intermediate]
+            //  .local x
+            //  .loop
+            //      for (x in a) {
+            //          /*body*/
+            //      }
+            //  .endloop
             if (inStatementContainingYield) {
                 beginScriptLoopBlock();
             }
@@ -56505,9 +70147,10 @@ var ts;
         function transformAndEmitContinueStatement(node) {
             var label = findContinueTarget(node.label ? ts.idText(node.label) : undefined);
             if (label > 0) {
-                emitBreak(label, node);
+                emitBreak(label, /*location*/ node);
             }
             else {
+                // invalid continue without a containing loop. Leave the node as is, per #17875.
                 emitStatement(node);
             }
         }
@@ -56515,7 +70158,7 @@ var ts;
             if (inStatementContainingYield) {
                 var label = findContinueTarget(node.label && ts.idText(node.label));
                 if (label > 0) {
-                    return createInlineBreak(label, node);
+                    return createInlineBreak(label, /*location*/ node);
                 }
             }
             return ts.visitEachChild(node, visitor, context);
@@ -56523,9 +70166,10 @@ var ts;
         function transformAndEmitBreakStatement(node) {
             var label = findBreakTarget(node.label ? ts.idText(node.label) : undefined);
             if (label > 0) {
-                emitBreak(label, node);
+                emitBreak(label, /*location*/ node);
             }
             else {
+                // invalid break without a containing loop, switch, or labeled statement. Leave the node as is, per #17875.
                 emitStatement(node);
             }
         }
@@ -56533,19 +70177,30 @@ var ts;
             if (inStatementContainingYield) {
                 var label = findBreakTarget(node.label && ts.idText(node.label));
                 if (label > 0) {
-                    return createInlineBreak(label, node);
+                    return createInlineBreak(label, /*location*/ node);
                 }
             }
             return ts.visitEachChild(node, visitor, context);
         }
         function transformAndEmitReturnStatement(node) {
-            emitReturn(ts.visitNode(node.expression, visitor, ts.isExpression), node);
+            emitReturn(ts.visitNode(node.expression, visitor, ts.isExpression), 
+            /*location*/ node);
         }
         function visitReturnStatement(node) {
-            return createInlineReturn(ts.visitNode(node.expression, visitor, ts.isExpression), node);
+            return createInlineReturn(ts.visitNode(node.expression, visitor, ts.isExpression), 
+            /*location*/ node);
         }
         function transformAndEmitWithStatement(node) {
             if (containsYield(node)) {
+                // [source]
+                //      with (x) {
+                //          /*body*/
+                //      }
+                //
+                // [intermediate]
+                //  .with (x)
+                //      /*body*/
+                //  .endwith
                 beginWithBlock(cacheExpression(ts.visitNode(node.expression, visitor, ts.isExpression)));
                 transformAndEmitEmbeddedStatement(node.statement);
                 endWithBlock();
@@ -56556,31 +70211,66 @@ var ts;
         }
         function transformAndEmitSwitchStatement(node) {
             if (containsYield(node.caseBlock)) {
+                // [source]
+                //      switch (x) {
+                //          case a:
+                //              /*caseStatements*/
+                //          case b:
+                //              /*caseStatements*/
+                //          default:
+                //              /*defaultStatements*/
+                //      }
+                //
+                // [intermediate]
+                //  .local _a
+                //  .switch endLabel
+                //      _a = x;
+                //      switch (_a) {
+                //          case a:
+                //  .br clauseLabels[0]
+                //      }
+                //      switch (_a) {
+                //          case b:
+                //  .br clauseLabels[1]
+                //      }
+                //  .br clauseLabels[2]
+                //  .mark clauseLabels[0]
+                //      /*caseStatements*/
+                //  .mark clauseLabels[1]
+                //      /*caseStatements*/
+                //  .mark clauseLabels[2]
+                //      /*caseStatements*/
+                //  .endswitch
+                //  .mark endLabel
                 var caseBlock = node.caseBlock;
                 var numClauses = caseBlock.clauses.length;
                 var endLabel = beginSwitchBlock();
                 var expression = cacheExpression(ts.visitNode(node.expression, visitor, ts.isExpression));
+                // Create labels for each clause and find the index of the first default clause.
                 var clauseLabels = [];
                 var defaultClauseIndex = -1;
                 for (var i = 0; i < numClauses; i++) {
                     var clause = caseBlock.clauses[i];
                     clauseLabels.push(defineLabel());
-                    if (clause.kind === 267 && defaultClauseIndex === -1) {
+                    if (clause.kind === 267 /* DefaultClause */ && defaultClauseIndex === -1) {
                         defaultClauseIndex = i;
                     }
                 }
+                // Emit switch statements for each run of case clauses either from the first case
+                // clause or the next case clause with a `yield` in its expression, up to the next
+                // case clause with a `yield` in its expression.
                 var clausesWritten = 0;
                 var pendingClauses = [];
                 while (clausesWritten < numClauses) {
                     var defaultClausesSkipped = 0;
                     for (var i = clausesWritten; i < numClauses; i++) {
                         var clause = caseBlock.clauses[i];
-                        if (clause.kind === 266) {
+                        if (clause.kind === 266 /* CaseClause */) {
                             if (containsYield(clause.expression) && pendingClauses.length > 0) {
                                 break;
                             }
                             pendingClauses.push(ts.createCaseClause(ts.visitNode(clause.expression, visitor, ts.isExpression), [
-                                createInlineBreak(clauseLabels[i], clause.expression)
+                                createInlineBreak(clauseLabels[i], /*location*/ clause.expression)
                             ]));
                         }
                         else {
@@ -56625,6 +70315,16 @@ var ts;
         }
         function transformAndEmitLabeledStatement(node) {
             if (containsYield(node)) {
+                // [source]
+                //      x: {
+                //          /*body*/
+                //      }
+                //
+                // [intermediate]
+                //  .labeled "x", endLabel
+                //      /*body*/
+                //  .endlabeled
+                //  .mark endLabel
                 beginLabeledBlock(ts.idText(node.label));
                 transformAndEmitEmbeddedStatement(node.statement);
                 endLabeledBlock();
@@ -56644,14 +70344,44 @@ var ts;
             return node;
         }
         function transformAndEmitThrowStatement(node) {
-            emitThrow(ts.visitNode(node.expression, visitor, ts.isExpression), node);
+            emitThrow(ts.visitNode(node.expression, visitor, ts.isExpression), 
+            /*location*/ node);
         }
         function transformAndEmitTryStatement(node) {
             if (containsYield(node)) {
+                // [source]
+                //      try {
+                //          /*tryBlock*/
+                //      }
+                //      catch (e) {
+                //          /*catchBlock*/
+                //      }
+                //      finally {
+                //          /*finallyBlock*/
+                //      }
+                //
+                // [intermediate]
+                //  .local _a
+                //  .try tryLabel, catchLabel, finallyLabel, endLabel
+                //  .mark tryLabel
+                //  .nop
+                //      /*tryBlock*/
+                //  .br endLabel
+                //  .catch
+                //  .mark catchLabel
+                //      _a = %error%;
+                //      /*catchBlock*/
+                //  .br endLabel
+                //  .finally
+                //  .mark finallyLabel
+                //      /*finallyBlock*/
+                //  .endfinally
+                //  .endtry
+                //  .mark endLabel
                 beginExceptionBlock();
                 transformAndEmitEmbeddedStatement(node.tryBlock);
                 if (node.catchClause) {
-                    beginCatchBlock(node.catchClause.variableDeclaration);
+                    beginCatchBlock(node.catchClause.variableDeclaration); // TODO: GH#18217
                     transformAndEmitEmbeddedStatement(node.catchClause.block);
                 }
                 if (node.finallyBlock) {
@@ -56665,7 +70395,7 @@ var ts;
             }
         }
         function containsYield(node) {
-            return !!node && (node.transformFlags & 16777216) !== 0;
+            return !!node && (node.transformFlags & 16777216 /* ContainsYield */) !== 0;
         }
         function countInitialNodesWithoutYield(nodes) {
             var numNodes = nodes.length;
@@ -56678,7 +70408,7 @@ var ts;
         }
         function onSubstituteNode(hint, node) {
             node = previousOnSubstituteNode(hint, node);
-            if (hint === 1) {
+            if (hint === 1 /* Expression */) {
                 return substituteExpression(node);
             }
             return node;
@@ -56709,20 +70439,23 @@ var ts;
         }
         function cacheExpression(node) {
             var temp;
-            if (ts.isGeneratedIdentifier(node) || ts.getEmitFlags(node) & 4096) {
+            if (ts.isGeneratedIdentifier(node) || ts.getEmitFlags(node) & 4096 /* HelperName */) {
                 return node;
             }
             temp = ts.createTempVariable(hoistVariableDeclaration);
-            emitAssignment(temp, node, node);
+            emitAssignment(temp, node, /*location*/ node);
             return temp;
         }
         function declareLocal(name) {
             var temp = name
                 ? ts.createUniqueName(name)
-                : ts.createTempVariable(undefined);
+                : ts.createTempVariable(/*recordTempVariable*/ undefined);
             hoistVariableDeclaration(temp);
             return temp;
         }
+        /**
+         * Defines a label, uses as the target of a Break operation.
+         */
         function defineLabel() {
             if (!labelOffsets) {
                 labelOffsets = [];
@@ -56732,10 +70465,18 @@ var ts;
             labelOffsets[label] = -1;
             return label;
         }
+        /**
+         * Marks the current operation with the specified label.
+         */
         function markLabel(label) {
             ts.Debug.assert(labelOffsets !== undefined, "No labels were defined.");
             labelOffsets[label] = operations ? operations.length : 0;
         }
+        /**
+         * Begins a block operation (With, Break/Continue, Try/Catch/Finally)
+         *
+         * @param block Information about the block.
+         */
         function beginBlock(block) {
             if (!blocks) {
                 blocks = [];
@@ -56744,61 +70485,87 @@ var ts;
                 blockStack = [];
             }
             var index = blockActions.length;
-            blockActions[index] = 0;
+            blockActions[index] = 0 /* Open */;
             blockOffsets[index] = operations ? operations.length : 0;
             blocks[index] = block;
             blockStack.push(block);
             return index;
         }
+        /**
+         * Ends the current block operation.
+         */
         function endBlock() {
             var block = peekBlock();
             if (block === undefined)
                 return ts.Debug.fail("beginBlock was never called.");
             var index = blockActions.length;
-            blockActions[index] = 1;
+            blockActions[index] = 1 /* Close */;
             blockOffsets[index] = operations ? operations.length : 0;
             blocks[index] = block;
             blockStack.pop();
             return block;
         }
+        /**
+         * Gets the current open block.
+         */
         function peekBlock() {
             return ts.lastOrUndefined(blockStack);
         }
+        /**
+         * Gets the kind of the current open block.
+         */
         function peekBlockKind() {
             var block = peekBlock();
             return block && block.kind;
         }
+        /**
+         * Begins a code block for a generated `with` statement.
+         *
+         * @param expression An identifier representing expression for the `with` block.
+         */
         function beginWithBlock(expression) {
             var startLabel = defineLabel();
             var endLabel = defineLabel();
             markLabel(startLabel);
             beginBlock({
-                kind: 1,
+                kind: 1 /* With */,
                 expression: expression,
                 startLabel: startLabel,
                 endLabel: endLabel
             });
         }
+        /**
+         * Ends a code block for a generated `with` statement.
+         */
         function endWithBlock() {
-            ts.Debug.assert(peekBlockKind() === 1);
+            ts.Debug.assert(peekBlockKind() === 1 /* With */);
             var block = endBlock();
             markLabel(block.endLabel);
         }
+        /**
+         * Begins a code block for a generated `try` statement.
+         */
         function beginExceptionBlock() {
             var startLabel = defineLabel();
             var endLabel = defineLabel();
             markLabel(startLabel);
             beginBlock({
-                kind: 0,
-                state: 0,
+                kind: 0 /* Exception */,
+                state: 0 /* Try */,
                 startLabel: startLabel,
                 endLabel: endLabel
             });
             emitNop();
             return endLabel;
         }
+        /**
+         * Enters the `catch` clause of a generated `try` statement.
+         *
+         * @param variable The catch variable.
+         */
         function beginCatchBlock(variable) {
-            ts.Debug.assert(peekBlockKind() === 0);
+            ts.Debug.assert(peekBlockKind() === 0 /* Exception */);
+            // generated identifiers should already be unique within a file
             var name;
             if (ts.isGeneratedIdentifier(variable.name)) {
                 name = variable.name;
@@ -56810,39 +70577,45 @@ var ts;
                 if (!renamedCatchVariables) {
                     renamedCatchVariables = ts.createMap();
                     renamedCatchVariableDeclarations = [];
-                    context.enableSubstitution(71);
+                    context.enableSubstitution(71 /* Identifier */);
                 }
                 renamedCatchVariables.set(text, true);
                 renamedCatchVariableDeclarations[ts.getOriginalNodeId(variable)] = name;
             }
             var exception = peekBlock();
-            ts.Debug.assert(exception.state < 1);
+            ts.Debug.assert(exception.state < 1 /* Catch */);
             var endLabel = exception.endLabel;
             emitBreak(endLabel);
             var catchLabel = defineLabel();
             markLabel(catchLabel);
-            exception.state = 1;
+            exception.state = 1 /* Catch */;
             exception.catchVariable = name;
             exception.catchLabel = catchLabel;
-            emitAssignment(name, ts.createCall(ts.createPropertyAccess(state, "sent"), undefined, []));
+            emitAssignment(name, ts.createCall(ts.createPropertyAccess(state, "sent"), /*typeArguments*/ undefined, []));
             emitNop();
         }
+        /**
+         * Enters the `finally` block of a generated `try` statement.
+         */
         function beginFinallyBlock() {
-            ts.Debug.assert(peekBlockKind() === 0);
+            ts.Debug.assert(peekBlockKind() === 0 /* Exception */);
             var exception = peekBlock();
-            ts.Debug.assert(exception.state < 2);
+            ts.Debug.assert(exception.state < 2 /* Finally */);
             var endLabel = exception.endLabel;
             emitBreak(endLabel);
             var finallyLabel = defineLabel();
             markLabel(finallyLabel);
-            exception.state = 2;
+            exception.state = 2 /* Finally */;
             exception.finallyLabel = finallyLabel;
         }
+        /**
+         * Ends the code block for a generated `try` statement.
+         */
         function endExceptionBlock() {
-            ts.Debug.assert(peekBlockKind() === 0);
+            ts.Debug.assert(peekBlockKind() === 0 /* Exception */);
             var exception = endBlock();
             var state = exception.state;
-            if (state < 2) {
+            if (state < 2 /* Finally */) {
                 emitBreak(exception.endLabel);
             }
             else {
@@ -56850,52 +70623,83 @@ var ts;
             }
             markLabel(exception.endLabel);
             emitNop();
-            exception.state = 3;
+            exception.state = 3 /* Done */;
         }
+        /**
+         * Begins a code block that supports `break` or `continue` statements that are defined in
+         * the source tree and not from generated code.
+         *
+         * @param labelText Names from containing labeled statements.
+         */
         function beginScriptLoopBlock() {
             beginBlock({
-                kind: 3,
+                kind: 3 /* Loop */,
                 isScript: true,
                 breakLabel: -1,
                 continueLabel: -1
             });
         }
+        /**
+         * Begins a code block that supports `break` or `continue` statements that are defined in
+         * generated code. Returns a label used to mark the operation to which to jump when a
+         * `break` statement targets this block.
+         *
+         * @param continueLabel A Label used to mark the operation to which to jump when a
+         *                      `continue` statement targets this block.
+         */
         function beginLoopBlock(continueLabel) {
             var breakLabel = defineLabel();
             beginBlock({
-                kind: 3,
+                kind: 3 /* Loop */,
                 isScript: false,
                 breakLabel: breakLabel,
                 continueLabel: continueLabel,
             });
             return breakLabel;
         }
+        /**
+         * Ends a code block that supports `break` or `continue` statements that are defined in
+         * generated code or in the source tree.
+         */
         function endLoopBlock() {
-            ts.Debug.assert(peekBlockKind() === 3);
+            ts.Debug.assert(peekBlockKind() === 3 /* Loop */);
             var block = endBlock();
             var breakLabel = block.breakLabel;
             if (!block.isScript) {
                 markLabel(breakLabel);
             }
         }
+        /**
+         * Begins a code block that supports `break` statements that are defined in the source
+         * tree and not from generated code.
+         *
+         */
         function beginScriptSwitchBlock() {
             beginBlock({
-                kind: 2,
+                kind: 2 /* Switch */,
                 isScript: true,
                 breakLabel: -1
             });
         }
+        /**
+         * Begins a code block that supports `break` statements that are defined in generated code.
+         * Returns a label used to mark the operation to which to jump when a `break` statement
+         * targets this block.
+         */
         function beginSwitchBlock() {
             var breakLabel = defineLabel();
             beginBlock({
-                kind: 2,
+                kind: 2 /* Switch */,
                 isScript: false,
                 breakLabel: breakLabel,
             });
             return breakLabel;
         }
+        /**
+         * Ends a code block that supports `break` statements that are defined in generated code.
+         */
         function endSwitchBlock() {
-            ts.Debug.assert(peekBlockKind() === 2);
+            ts.Debug.assert(peekBlockKind() === 2 /* Switch */);
             var block = endBlock();
             var breakLabel = block.breakLabel;
             if (!block.isScript) {
@@ -56904,7 +70708,7 @@ var ts;
         }
         function beginScriptLabeledBlock(labelText) {
             beginBlock({
-                kind: 4,
+                kind: 4 /* Labeled */,
                 isScript: true,
                 labelText: labelText,
                 breakLabel: -1
@@ -56913,28 +70717,43 @@ var ts;
         function beginLabeledBlock(labelText) {
             var breakLabel = defineLabel();
             beginBlock({
-                kind: 4,
+                kind: 4 /* Labeled */,
                 isScript: false,
                 labelText: labelText,
                 breakLabel: breakLabel
             });
         }
         function endLabeledBlock() {
-            ts.Debug.assert(peekBlockKind() === 4);
+            ts.Debug.assert(peekBlockKind() === 4 /* Labeled */);
             var block = endBlock();
             if (!block.isScript) {
                 markLabel(block.breakLabel);
             }
         }
+        /**
+         * Indicates whether the provided block supports `break` statements.
+         *
+         * @param block A code block.
+         */
         function supportsUnlabeledBreak(block) {
-            return block.kind === 2
-                || block.kind === 3;
+            return block.kind === 2 /* Switch */
+                || block.kind === 3 /* Loop */;
         }
+        /**
+         * Indicates whether the provided block supports `break` statements with labels.
+         *
+         * @param block A code block.
+         */
         function supportsLabeledBreakOrContinue(block) {
-            return block.kind === 4;
+            return block.kind === 4 /* Labeled */;
         }
+        /**
+         * Indicates whether the provided block supports `continue` statements.
+         *
+         * @param block A code block.
+         */
         function supportsUnlabeledContinue(block) {
-            return block.kind === 3;
+            return block.kind === 3 /* Loop */;
         }
         function hasImmediateContainingLabeledBlock(labelText, start) {
             for (var j = start; j >= 0; j--) {
@@ -56950,6 +70769,11 @@ var ts;
             }
             return false;
         }
+        /**
+         * Finds the label that is the target for a `break` statement.
+         *
+         * @param labelText An optional name of a containing labeled statement.
+         */
         function findBreakTarget(labelText) {
             if (blockStack) {
                 if (labelText) {
@@ -56974,6 +70798,11 @@ var ts;
             }
             return 0;
         }
+        /**
+         * Finds the label that is the target for a `continue` statement.
+         *
+         * @param labelText An optional name of a containing labeled statement.
+         */
         function findContinueTarget(labelText) {
             if (blockStack) {
                 if (labelText) {
@@ -56995,6 +70824,11 @@ var ts;
             }
             return 0;
         }
+        /**
+         * Creates an expression that can be used to indicate the value for a label.
+         *
+         * @param label A label.
+         */
         function createLabel(label) {
             if (label !== undefined && label > 0) {
                 if (labelExpressions === undefined) {
@@ -57011,64 +70845,153 @@ var ts;
             }
             return ts.createOmittedExpression();
         }
+        /**
+         * Creates a numeric literal for the provided instruction.
+         */
         function createInstruction(instruction) {
             var literal = ts.createLiteral(instruction);
-            ts.addSyntheticTrailingComment(literal, 3, getInstructionName(instruction));
+            ts.addSyntheticTrailingComment(literal, 3 /* MultiLineCommentTrivia */, getInstructionName(instruction));
             return literal;
         }
+        /**
+         * Creates a statement that can be used indicate a Break operation to the provided label.
+         *
+         * @param label A label.
+         * @param location An optional source map location for the statement.
+         */
         function createInlineBreak(label, location) {
             ts.Debug.assertLessThan(0, label, "Invalid label");
             return ts.setTextRange(ts.createReturn(ts.createArrayLiteral([
-                createInstruction(3),
+                createInstruction(3 /* Break */),
                 createLabel(label)
             ])), location);
         }
+        /**
+         * Creates a statement that can be used indicate a Return operation.
+         *
+         * @param expression The expression for the return statement.
+         * @param location An optional source map location for the statement.
+         */
         function createInlineReturn(expression, location) {
             return ts.setTextRange(ts.createReturn(ts.createArrayLiteral(expression
-                ? [createInstruction(2), expression]
-                : [createInstruction(2)])), location);
+                ? [createInstruction(2 /* Return */), expression]
+                : [createInstruction(2 /* Return */)])), location);
         }
+        /**
+         * Creates an expression that can be used to resume from a Yield operation.
+         */
         function createGeneratorResume(location) {
-            return ts.setTextRange(ts.createCall(ts.createPropertyAccess(state, "sent"), undefined, []), location);
+            return ts.setTextRange(ts.createCall(ts.createPropertyAccess(state, "sent"), 
+            /*typeArguments*/ undefined, []), location);
         }
+        /**
+         * Emits an empty instruction.
+         */
         function emitNop() {
-            emitWorker(0);
+            emitWorker(0 /* Nop */);
         }
+        /**
+         * Emits a Statement.
+         *
+         * @param node A statement.
+         */
         function emitStatement(node) {
             if (node) {
-                emitWorker(1, [node]);
+                emitWorker(1 /* Statement */, [node]);
             }
             else {
                 emitNop();
             }
         }
+        /**
+         * Emits an Assignment operation.
+         *
+         * @param left The left-hand side of the assignment.
+         * @param right The right-hand side of the assignment.
+         * @param location An optional source map location for the assignment.
+         */
         function emitAssignment(left, right, location) {
-            emitWorker(2, [left, right], location);
+            emitWorker(2 /* Assign */, [left, right], location);
         }
+        /**
+         * Emits a Break operation to the specified label.
+         *
+         * @param label A label.
+         * @param location An optional source map location for the assignment.
+         */
         function emitBreak(label, location) {
-            emitWorker(3, [label], location);
+            emitWorker(3 /* Break */, [label], location);
         }
+        /**
+         * Emits a Break operation to the specified label when a condition evaluates to a truthy
+         * value at runtime.
+         *
+         * @param label A label.
+         * @param condition The condition.
+         * @param location An optional source map location for the assignment.
+         */
         function emitBreakWhenTrue(label, condition, location) {
-            emitWorker(4, [label, condition], location);
+            emitWorker(4 /* BreakWhenTrue */, [label, condition], location);
         }
+        /**
+         * Emits a Break to the specified label when a condition evaluates to a falsey value at
+         * runtime.
+         *
+         * @param label A label.
+         * @param condition The condition.
+         * @param location An optional source map location for the assignment.
+         */
         function emitBreakWhenFalse(label, condition, location) {
-            emitWorker(5, [label, condition], location);
+            emitWorker(5 /* BreakWhenFalse */, [label, condition], location);
         }
+        /**
+         * Emits a YieldStar operation for the provided expression.
+         *
+         * @param expression An optional value for the yield operation.
+         * @param location An optional source map location for the assignment.
+         */
         function emitYieldStar(expression, location) {
-            emitWorker(7, [expression], location);
+            emitWorker(7 /* YieldStar */, [expression], location);
         }
+        /**
+         * Emits a Yield operation for the provided expression.
+         *
+         * @param expression An optional value for the yield operation.
+         * @param location An optional source map location for the assignment.
+         */
         function emitYield(expression, location) {
-            emitWorker(6, [expression], location);
+            emitWorker(6 /* Yield */, [expression], location);
         }
+        /**
+         * Emits a Return operation for the provided expression.
+         *
+         * @param expression An optional value for the operation.
+         * @param location An optional source map location for the assignment.
+         */
         function emitReturn(expression, location) {
-            emitWorker(8, [expression], location);
+            emitWorker(8 /* Return */, [expression], location);
         }
+        /**
+         * Emits a Throw operation for the provided expression.
+         *
+         * @param expression A value for the operation.
+         * @param location An optional source map location for the assignment.
+         */
         function emitThrow(expression, location) {
-            emitWorker(9, [expression], location);
+            emitWorker(9 /* Throw */, [expression], location);
         }
+        /**
+         * Emits an Endfinally operation. This is used to handle `finally` block semantics.
+         */
         function emitEndfinally() {
-            emitWorker(10);
+            emitWorker(10 /* Endfinally */);
         }
+        /**
+         * Emits an operation.
+         *
+         * @param code The OpCode for the operation.
+         * @param args The optional arguments for the operation.
+         */
         function emitWorker(code, args, location) {
             if (operations === undefined) {
                 operations = [];
@@ -57076,6 +70999,7 @@ var ts;
                 operationLocations = [];
             }
             if (labelOffsets === undefined) {
+                // mark entry point
                 markLabel(defineLabel());
             }
             var operationIndex = operations.length;
@@ -57083,6 +71007,9 @@ var ts;
             operationArguments[operationIndex] = args;
             operationLocations[operationIndex] = location;
         }
+        /**
+         * Builds the generator function body.
+         */
         function build() {
             blockIndex = 0;
             labelNumber = 0;
@@ -57095,8 +71022,17 @@ var ts;
             currentExceptionBlock = undefined;
             withBlockStack = undefined;
             var buildResult = buildStatements();
-            return createGeneratorHelper(context, ts.setEmitFlags(ts.createFunctionExpression(undefined, undefined, undefined, undefined, [ts.createParameter(undefined, undefined, undefined, state)], undefined, ts.createBlock(buildResult, buildResult.length > 0)), 524288));
+            return createGeneratorHelper(context, ts.setEmitFlags(ts.createFunctionExpression(
+            /*modifiers*/ undefined, 
+            /*asteriskToken*/ undefined, 
+            /*name*/ undefined, 
+            /*typeParameters*/ undefined, [ts.createParameter(/*decorators*/ undefined, /*modifiers*/ undefined, /*dotDotDotToken*/ undefined, state)], 
+            /*type*/ undefined, ts.createBlock(buildResult, 
+            /*multiLine*/ buildResult.length > 0)), 524288 /* ReuseTempVariableScope */));
         }
+        /**
+         * Builds the statements for the generator function body.
+         */
         function buildStatements() {
             if (operations) {
                 for (var operationIndex = 0; operationIndex < operations.length; operationIndex++) {
@@ -57117,33 +71053,49 @@ var ts;
             }
             return [];
         }
+        /**
+         * Flush the current label and advance to a new label.
+         */
         function flushLabel() {
             if (!statements) {
                 return;
             }
-            appendLabel(!lastOperationWasAbrupt);
+            appendLabel(/*markLabelEnd*/ !lastOperationWasAbrupt);
             lastOperationWasAbrupt = false;
             lastOperationWasCompletion = false;
             labelNumber++;
         }
+        /**
+         * Flush the final label of the generator function body.
+         */
         function flushFinalLabel(operationIndex) {
             if (isFinalLabelReachable(operationIndex)) {
                 tryEnterLabel(operationIndex);
                 withBlockStack = undefined;
-                writeReturn(undefined, undefined);
+                writeReturn(/*expression*/ undefined, /*operationLocation*/ undefined);
             }
             if (statements && clauses) {
-                appendLabel(false);
+                appendLabel(/*markLabelEnd*/ false);
             }
             updateLabelExpressions();
         }
+        /**
+         * Tests whether the final label of the generator function body
+         * is reachable by user code.
+         */
         function isFinalLabelReachable(operationIndex) {
+            // if the last operation was *not* a completion (return/throw) then
+            // the final label is reachable.
             if (!lastOperationWasCompletion) {
                 return true;
             }
+            // if there are no labels defined or referenced, then the final label is
+            // not reachable.
             if (!labelOffsets || !labelExpressions) {
                 return false;
             }
+            // if the label for this offset is referenced, then the final label
+            // is reachable.
             for (var label = 0; label < labelOffsets.length; label++) {
                 if (labelOffsets[label] === operationIndex && labelExpressions[label]) {
                     return true;
@@ -57151,20 +71103,33 @@ var ts;
             }
             return false;
         }
+        /**
+         * Appends a case clause for the last label and sets the new label.
+         *
+         * @param markLabelEnd Indicates that the transition between labels was a fall-through
+         *                     from a previous case clause and the change in labels should be
+         *                     reflected on the `state` object.
+         */
         function appendLabel(markLabelEnd) {
             if (!clauses) {
                 clauses = [];
             }
             if (statements) {
                 if (withBlockStack) {
+                    // The previous label was nested inside one or more `with` blocks, so we
+                    // surround the statements in generated `with` blocks to create the same environment.
                     for (var i = withBlockStack.length - 1; i >= 0; i--) {
                         var withBlock = withBlockStack[i];
                         statements = [ts.createWith(withBlock.expression, ts.createBlock(statements))];
                     }
                 }
                 if (currentExceptionBlock) {
+                    // The previous label was nested inside of an exception block, so we must
+                    // indicate entry into a protected region by pushing the label numbers
+                    // for each block in the protected region.
                     var startLabel = currentExceptionBlock.startLabel, catchLabel = currentExceptionBlock.catchLabel, finallyLabel = currentExceptionBlock.finallyLabel, endLabel = currentExceptionBlock.endLabel;
-                    statements.unshift(ts.createStatement(ts.createCall(ts.createPropertyAccess(ts.createPropertyAccess(state, "trys"), "push"), undefined, [
+                    statements.unshift(ts.createStatement(ts.createCall(ts.createPropertyAccess(ts.createPropertyAccess(state, "trys"), "push"), 
+                    /*typeArguments*/ undefined, [
                         ts.createArrayLiteral([
                             createLabel(startLabel),
                             createLabel(catchLabel),
@@ -57175,12 +71140,17 @@ var ts;
                     currentExceptionBlock = undefined;
                 }
                 if (markLabelEnd) {
+                    // The case clause for the last label falls through to this label, so we
+                    // add an assignment statement to reflect the change in labels.
                     statements.push(ts.createStatement(ts.createAssignment(ts.createPropertyAccess(state, "label"), ts.createLiteral(labelNumber + 1))));
                 }
             }
             clauses.push(ts.createCaseClause(ts.createLiteral(labelNumber), statements || []));
             statements = undefined;
         }
+        /**
+         * Tries to enter into a new label at the current operation index.
+         */
         function tryEnterLabel(operationIndex) {
             if (!labelOffsets) {
                 return;
@@ -57200,6 +71170,9 @@ var ts;
                 }
             }
         }
+        /**
+         * Updates literal expressions for labels with actual label numbers.
+         */
         function updateLabelExpressions() {
             if (labelExpressions !== undefined && labelNumbers !== undefined) {
                 for (var labelNumber_1 = 0; labelNumber_1 < labelNumbers.length; labelNumber_1++) {
@@ -57219,14 +71192,17 @@ var ts;
                 }
             }
         }
+        /**
+         * Tries to enter or leave a code block.
+         */
         function tryEnterOrLeaveBlock(operationIndex) {
             if (blocks) {
                 for (; blockIndex < blockActions.length && blockOffsets[blockIndex] <= operationIndex; blockIndex++) {
                     var block = blocks[blockIndex];
                     var blockAction = blockActions[blockIndex];
                     switch (block.kind) {
-                        case 0:
-                            if (blockAction === 0) {
+                        case 0 /* Exception */:
+                            if (blockAction === 0 /* Open */) {
                                 if (!exceptionBlockStack) {
                                     exceptionBlockStack = [];
                                 }
@@ -57236,64 +71212,76 @@ var ts;
                                 exceptionBlockStack.push(currentExceptionBlock);
                                 currentExceptionBlock = block;
                             }
-                            else if (blockAction === 1) {
+                            else if (blockAction === 1 /* Close */) {
                                 currentExceptionBlock = exceptionBlockStack.pop();
                             }
                             break;
-                        case 1:
-                            if (blockAction === 0) {
+                        case 1 /* With */:
+                            if (blockAction === 0 /* Open */) {
                                 if (!withBlockStack) {
                                     withBlockStack = [];
                                 }
                                 withBlockStack.push(block);
                             }
-                            else if (blockAction === 1) {
+                            else if (blockAction === 1 /* Close */) {
                                 withBlockStack.pop();
                             }
                             break;
+                        // default: do nothing
                     }
                 }
             }
         }
+        /**
+         * Writes an operation as a statement to the current label's statement list.
+         *
+         * @param operation The OpCode of the operation
+         */
         function writeOperation(operationIndex) {
             tryEnterLabel(operationIndex);
             tryEnterOrLeaveBlock(operationIndex);
+            // early termination, nothing else to process in this label
             if (lastOperationWasAbrupt) {
                 return;
             }
             lastOperationWasAbrupt = false;
             lastOperationWasCompletion = false;
             var opcode = operations[operationIndex];
-            if (opcode === 0) {
+            if (opcode === 0 /* Nop */) {
                 return;
             }
-            else if (opcode === 10) {
+            else if (opcode === 10 /* Endfinally */) {
                 return writeEndfinally();
             }
             var args = operationArguments[operationIndex];
-            if (opcode === 1) {
+            if (opcode === 1 /* Statement */) {
                 return writeStatement(args[0]);
             }
             var location = operationLocations[operationIndex];
             switch (opcode) {
-                case 2:
+                case 2 /* Assign */:
                     return writeAssign(args[0], args[1], location);
-                case 3:
+                case 3 /* Break */:
                     return writeBreak(args[0], location);
-                case 4:
+                case 4 /* BreakWhenTrue */:
                     return writeBreakWhenTrue(args[0], args[1], location);
-                case 5:
+                case 5 /* BreakWhenFalse */:
                     return writeBreakWhenFalse(args[0], args[1], location);
-                case 6:
+                case 6 /* Yield */:
                     return writeYield(args[0], location);
-                case 7:
+                case 7 /* YieldStar */:
                     return writeYieldStar(args[0], location);
-                case 8:
+                case 8 /* Return */:
                     return writeReturn(args[0], location);
-                case 9:
+                case 9 /* Throw */:
                     return writeThrow(args[0], location);
             }
         }
+        /**
+         * Writes a statement to the current label's statement list.
+         *
+         * @param statement A statement to write.
+         */
         function writeStatement(statement) {
             if (statement) {
                 if (!statements) {
@@ -57304,65 +71292,179 @@ var ts;
                 }
             }
         }
+        /**
+         * Writes an Assign operation to the current label's statement list.
+         *
+         * @param left The left-hand side of the assignment.
+         * @param right The right-hand side of the assignment.
+         * @param operationLocation The source map location for the operation.
+         */
         function writeAssign(left, right, operationLocation) {
             writeStatement(ts.setTextRange(ts.createStatement(ts.createAssignment(left, right)), operationLocation));
         }
+        /**
+         * Writes a Throw operation to the current label's statement list.
+         *
+         * @param expression The value to throw.
+         * @param operationLocation The source map location for the operation.
+         */
         function writeThrow(expression, operationLocation) {
             lastOperationWasAbrupt = true;
             lastOperationWasCompletion = true;
             writeStatement(ts.setTextRange(ts.createThrow(expression), operationLocation));
         }
+        /**
+         * Writes a Return operation to the current label's statement list.
+         *
+         * @param expression The value to return.
+         * @param operationLocation The source map location for the operation.
+         */
         function writeReturn(expression, operationLocation) {
             lastOperationWasAbrupt = true;
             lastOperationWasCompletion = true;
             writeStatement(ts.setEmitFlags(ts.setTextRange(ts.createReturn(ts.createArrayLiteral(expression
-                ? [createInstruction(2), expression]
-                : [createInstruction(2)])), operationLocation), 384));
+                ? [createInstruction(2 /* Return */), expression]
+                : [createInstruction(2 /* Return */)])), operationLocation), 384 /* NoTokenSourceMaps */));
         }
+        /**
+         * Writes a Break operation to the current label's statement list.
+         *
+         * @param label The label for the Break.
+         * @param operationLocation The source map location for the operation.
+         */
         function writeBreak(label, operationLocation) {
             lastOperationWasAbrupt = true;
             writeStatement(ts.setEmitFlags(ts.setTextRange(ts.createReturn(ts.createArrayLiteral([
-                createInstruction(3),
+                createInstruction(3 /* Break */),
                 createLabel(label)
-            ])), operationLocation), 384));
+            ])), operationLocation), 384 /* NoTokenSourceMaps */));
         }
+        /**
+         * Writes a BreakWhenTrue operation to the current label's statement list.
+         *
+         * @param label The label for the Break.
+         * @param condition The condition for the Break.
+         * @param operationLocation The source map location for the operation.
+         */
         function writeBreakWhenTrue(label, condition, operationLocation) {
             writeStatement(ts.setEmitFlags(ts.createIf(condition, ts.setEmitFlags(ts.setTextRange(ts.createReturn(ts.createArrayLiteral([
-                createInstruction(3),
+                createInstruction(3 /* Break */),
                 createLabel(label)
-            ])), operationLocation), 384)), 1));
+            ])), operationLocation), 384 /* NoTokenSourceMaps */)), 1 /* SingleLine */));
         }
+        /**
+         * Writes a BreakWhenFalse operation to the current label's statement list.
+         *
+         * @param label The label for the Break.
+         * @param condition The condition for the Break.
+         * @param operationLocation The source map location for the operation.
+         */
         function writeBreakWhenFalse(label, condition, operationLocation) {
             writeStatement(ts.setEmitFlags(ts.createIf(ts.createLogicalNot(condition), ts.setEmitFlags(ts.setTextRange(ts.createReturn(ts.createArrayLiteral([
-                createInstruction(3),
+                createInstruction(3 /* Break */),
                 createLabel(label)
-            ])), operationLocation), 384)), 1));
+            ])), operationLocation), 384 /* NoTokenSourceMaps */)), 1 /* SingleLine */));
         }
+        /**
+         * Writes a Yield operation to the current label's statement list.
+         *
+         * @param expression The expression to yield.
+         * @param operationLocation The source map location for the operation.
+         */
         function writeYield(expression, operationLocation) {
             lastOperationWasAbrupt = true;
             writeStatement(ts.setEmitFlags(ts.setTextRange(ts.createReturn(ts.createArrayLiteral(expression
-                ? [createInstruction(4), expression]
-                : [createInstruction(4)])), operationLocation), 384));
+                ? [createInstruction(4 /* Yield */), expression]
+                : [createInstruction(4 /* Yield */)])), operationLocation), 384 /* NoTokenSourceMaps */));
         }
+        /**
+         * Writes a YieldStar instruction to the current label's statement list.
+         *
+         * @param expression The expression to yield.
+         * @param operationLocation The source map location for the operation.
+         */
         function writeYieldStar(expression, operationLocation) {
             lastOperationWasAbrupt = true;
             writeStatement(ts.setEmitFlags(ts.setTextRange(ts.createReturn(ts.createArrayLiteral([
-                createInstruction(5),
+                createInstruction(5 /* YieldStar */),
                 expression
-            ])), operationLocation), 384));
+            ])), operationLocation), 384 /* NoTokenSourceMaps */));
         }
+        /**
+         * Writes an Endfinally instruction to the current label's statement list.
+         */
         function writeEndfinally() {
             lastOperationWasAbrupt = true;
             writeStatement(ts.createReturn(ts.createArrayLiteral([
-                createInstruction(7)
+                createInstruction(7 /* Endfinally */)
             ])));
         }
     }
     ts.transformGenerators = transformGenerators;
     function createGeneratorHelper(context, body) {
         context.requestEmitHelper(generatorHelper);
-        return ts.createCall(ts.getHelperName("__generator"), undefined, [ts.createThis(), body]);
+        return ts.createCall(ts.getHelperName("__generator"), 
+        /*typeArguments*/ undefined, [ts.createThis(), body]);
     }
+    // The __generator helper is used by down-level transformations to emulate the runtime
+    // semantics of an ES2015 generator function. When called, this helper returns an
+    // object that implements the Iterator protocol, in that it has `next`, `return`, and
+    // `throw` methods that step through the generator when invoked.
+    //
+    // parameters:
+    //  @param thisArg  The value to use as the `this` binding for the transformed generator body.
+    //  @param body     A function that acts as the transformed generator body.
+    //
+    // variables:
+    //  _       Persistent state for the generator that is shared between the helper and the
+    //          generator body. The state object has the following members:
+    //            sent() - A method that returns or throws the current completion value.
+    //            label  - The next point at which to resume evaluation of the generator body.
+    //            trys   - A stack of protected regions (try/catch/finally blocks).
+    //            ops    - A stack of pending instructions when inside of a finally block.
+    //  f       A value indicating whether the generator is executing.
+    //  y       An iterator to delegate for a yield*.
+    //  t       A temporary variable that holds one of the following values (note that these
+    //          cases do not overlap):
+    //          - The completion value when resuming from a `yield` or `yield*`.
+    //          - The error value for a catch block.
+    //          - The current protected region (array of try/catch/finally/end labels).
+    //          - The verb (`next`, `throw`, or `return` method) to delegate to the expression
+    //            of a `yield*`.
+    //          - The result of evaluating the verb delegated to the expression of a `yield*`.
+    //
+    // functions:
+    //  verb(n)     Creates a bound callback to the `step` function for opcode `n`.
+    //  step(op)    Evaluates opcodes in a generator body until execution is suspended or
+    //              completed.
+    //
+    // The __generator helper understands a limited set of instructions:
+    //  0: next(value?)     - Start or resume the generator with the specified value.
+    //  1: throw(error)     - Resume the generator with an exception. If the generator is
+    //                        suspended inside of one or more protected regions, evaluates
+    //                        any intervening finally blocks between the current label and
+    //                        the nearest catch block or function boundary. If uncaught, the
+    //                        exception is thrown to the caller.
+    //  2: return(value?)   - Resume the generator as if with a return. If the generator is
+    //                        suspended inside of one or more protected regions, evaluates any
+    //                        intervening finally blocks.
+    //  3: break(label)     - Jump to the specified label. If the label is outside of the
+    //                        current protected region, evaluates any intervening finally
+    //                        blocks.
+    //  4: yield(value?)    - Yield execution to the caller with an optional value. When
+    //                        resumed, the generator will continue at the next label.
+    //  5: yield*(value)    - Delegates evaluation to the supplied iterator. When
+    //                        delegation completes, the generator will continue at the next
+    //                        label.
+    //  6: catch(error)     - Handles an exception thrown from within the generator body. If
+    //                        the current label is inside of one or more protected regions,
+    //                        evaluates any intervening finally blocks between the current
+    //                        label and the nearest catch block or function boundary. If
+    //                        uncaught, the exception is thrown to the caller.
+    //  7: endfinally       - Ends a finally block, resuming the last instruction prior to
+    //                        entering a finally block.
+    //
+    // For examples of how these are used, see the comments in ./transformers/generators.ts
     var generatorHelper = {
         name: "typescript:generator",
         scoped: false,
@@ -57370,6 +71472,7 @@ var ts;
         text: "\n            var __generator = (this && this.__generator) || function (thisArg, body) {\n                var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;\n                return g = { next: verb(0), \"throw\": verb(1), \"return\": verb(2) }, typeof Symbol === \"function\" && (g[Symbol.iterator] = function() { return this; }), g;\n                function verb(n) { return function (v) { return step([n, v]); }; }\n                function step(op) {\n                    if (f) throw new TypeError(\"Generator is already executing.\");\n                    while (_) try {\n                        if (f = 1, y && (t = op[0] & 2 ? y[\"return\"] : op[0] ? y[\"throw\"] || ((t = y[\"return\"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;\n                        if (y = 0, t) op = [op[0] & 2, t.value];\n                        switch (op[0]) {\n                            case 0: case 1: t = op; break;\n                            case 4: _.label++; return { value: op[1], done: false };\n                            case 5: _.label++; y = op[1]; op = [0]; continue;\n                            case 7: op = _.ops.pop(); _.trys.pop(); continue;\n                            default:\n                                if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }\n                                if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }\n                                if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }\n                                if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }\n                                if (t[2]) _.ops.pop();\n                                _.trys.pop(); continue;\n                        }\n                        op = body.call(thisArg, _);\n                    } catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }\n                    if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };\n                }\n            };"
     };
 })(ts || (ts = {}));
+/*@internal*/
 var ts;
 (function (ts) {
     function transformModule(context) {
@@ -57390,26 +71493,32 @@ var ts;
         var previousOnEmitNode = context.onEmitNode;
         context.onSubstituteNode = onSubstituteNode;
         context.onEmitNode = onEmitNode;
-        context.enableSubstitution(71);
-        context.enableSubstitution(200);
-        context.enableSubstitution(198);
-        context.enableSubstitution(199);
-        context.enableSubstitution(271);
-        context.enableEmitNotification(274);
-        var moduleInfoMap = [];
-        var deferredExports = [];
-        var currentSourceFile;
-        var currentModuleInfo;
-        var noSubstitution;
+        context.enableSubstitution(71 /* Identifier */); // Substitutes expression identifiers with imported/exported symbols.
+        context.enableSubstitution(200 /* BinaryExpression */); // Substitutes assignments to exported symbols.
+        context.enableSubstitution(198 /* PrefixUnaryExpression */); // Substitutes updates to exported symbols.
+        context.enableSubstitution(199 /* PostfixUnaryExpression */); // Substitutes updates to exported symbols.
+        context.enableSubstitution(271 /* ShorthandPropertyAssignment */); // Substitutes shorthand property assignments for imported/exported symbols.
+        context.enableEmitNotification(274 /* SourceFile */); // Restore state when substituting nodes in a file.
+        var moduleInfoMap = []; // The ExternalModuleInfo for each file.
+        var deferredExports = []; // Exports to defer until an EndOfDeclarationMarker is found.
+        var currentSourceFile; // The current file.
+        var currentModuleInfo; // The ExternalModuleInfo for the current file.
+        var noSubstitution; // Set of nodes for which substitution rules should be ignored.
         var needUMDDynamicImportHelper;
         return ts.chainBundle(transformSourceFile);
+        /**
+         * Transforms the module aspects of a SourceFile.
+         *
+         * @param node The SourceFile node.
+         */
         function transformSourceFile(node) {
-            if (node.isDeclarationFile || !(ts.isEffectiveExternalModule(node, compilerOptions) || node.transformFlags & 67108864)) {
+            if (node.isDeclarationFile || !(ts.isEffectiveExternalModule(node, compilerOptions) || node.transformFlags & 67108864 /* ContainsDynamicImport */)) {
                 return node;
             }
             currentSourceFile = node;
             currentModuleInfo = ts.collectExternalModuleInfo(node, resolver, compilerOptions);
             moduleInfoMap[ts.getOriginalNodeId(node)] = currentModuleInfo;
+            // Perform the transformation.
             var transformModule = getTransformModuleDelegate(moduleKind);
             var updated = transformModule(node);
             currentSourceFile = undefined;
@@ -57423,6 +71532,11 @@ var ts;
             }
             return false;
         }
+        /**
+         * Transforms a SourceFile into a CommonJS module.
+         *
+         * @param node The SourceFile node.
+         */
         function transformCommonJSModule(node) {
             startLexicalEnvironment();
             var statements = [];
@@ -57433,48 +71547,105 @@ var ts;
             }
             ts.append(statements, ts.visitNode(currentModuleInfo.externalHelpersImportDeclaration, sourceElementVisitor, ts.isStatement));
             ts.addRange(statements, ts.visitNodes(node.statements, sourceElementVisitor, ts.isStatement, statementOffset));
-            addExportEqualsIfNeeded(statements, false);
+            addExportEqualsIfNeeded(statements, /*emitAsReturn*/ false);
             ts.prependStatements(statements, endLexicalEnvironment());
             var updated = ts.updateSourceFileNode(node, ts.setTextRange(ts.createNodeArray(statements), node.statements));
             if (currentModuleInfo.hasExportStarsToExportValues && !compilerOptions.importHelpers) {
+                // If we have any `export * from ...` declarations
+                // we need to inform the emitter to add the __export helper.
                 ts.addEmitHelper(updated, exportStarHelper);
             }
             ts.addEmitHelpers(updated, context.readEmitHelpers());
             return updated;
         }
+        /**
+         * Transforms a SourceFile into an AMD module.
+         *
+         * @param node The SourceFile node.
+         */
         function transformAMDModule(node) {
             var define = ts.createIdentifier("define");
             var moduleName = ts.tryGetModuleNameFromFile(node, host, compilerOptions);
-            var _a = collectAsynchronousDependencies(node, true), aliasedModuleNames = _a.aliasedModuleNames, unaliasedModuleNames = _a.unaliasedModuleNames, importAliasNames = _a.importAliasNames;
+            // An AMD define function has the following shape:
+            //
+            //     define(id?, dependencies?, factory);
+            //
+            // This has the shape of the following:
+            //
+            //     define(name, ["module1", "module2"], function (module1Alias) { ... }
+            //
+            // The location of the alias in the parameter list in the factory function needs to
+            // match the position of the module name in the dependency list.
+            //
+            // To ensure this is true in cases of modules with no aliases, e.g.:
+            //
+            //     import "module"
+            //
+            // or
+            //
+            //     /// <amd-dependency path= "a.css" />
+            //
+            // we need to add modules without alias names to the end of the dependencies list
+            var _a = collectAsynchronousDependencies(node, /*includeNonAmdDependencies*/ true), aliasedModuleNames = _a.aliasedModuleNames, unaliasedModuleNames = _a.unaliasedModuleNames, importAliasNames = _a.importAliasNames;
+            // Create an updated SourceFile:
+            //
+            //     define(moduleName?, ["module1", "module2"], function ...
             var updated = ts.updateSourceFileNode(node, ts.setTextRange(ts.createNodeArray([
-                ts.createStatement(ts.createCall(define, undefined, (moduleName ? [moduleName] : []).concat([
+                ts.createStatement(ts.createCall(define, 
+                /*typeArguments*/ undefined, (moduleName ? [moduleName] : []).concat([
+                    // Add the dependency array argument:
+                    //
+                    //     ["require", "exports", module1", "module2", ...]
                     ts.createArrayLiteral([
                         ts.createLiteral("require"),
                         ts.createLiteral("exports")
                     ].concat(aliasedModuleNames, unaliasedModuleNames)),
-                    ts.createFunctionExpression(undefined, undefined, undefined, undefined, [
-                        ts.createParameter(undefined, undefined, undefined, "require"),
-                        ts.createParameter(undefined, undefined, undefined, "exports")
-                    ].concat(importAliasNames), undefined, transformAsynchronousModuleBody(node))
+                    // Add the module body function argument:
+                    //
+                    //     function (require, exports, module1, module2) ...
+                    ts.createFunctionExpression(
+                    /*modifiers*/ undefined, 
+                    /*asteriskToken*/ undefined, 
+                    /*name*/ undefined, 
+                    /*typeParameters*/ undefined, [
+                        ts.createParameter(/*decorators*/ undefined, /*modifiers*/ undefined, /*dotDotDotToken*/ undefined, "require"),
+                        ts.createParameter(/*decorators*/ undefined, /*modifiers*/ undefined, /*dotDotDotToken*/ undefined, "exports")
+                    ].concat(importAliasNames), 
+                    /*type*/ undefined, transformAsynchronousModuleBody(node))
                 ])))
-            ]), node.statements));
+            ]), 
+            /*location*/ node.statements));
             ts.addEmitHelpers(updated, context.readEmitHelpers());
             return updated;
         }
+        /**
+         * Transforms a SourceFile into a UMD module.
+         *
+         * @param node The SourceFile node.
+         */
         function transformUMDModule(node) {
-            var _a = collectAsynchronousDependencies(node, false), aliasedModuleNames = _a.aliasedModuleNames, unaliasedModuleNames = _a.unaliasedModuleNames, importAliasNames = _a.importAliasNames;
+            var _a = collectAsynchronousDependencies(node, /*includeNonAmdDependencies*/ false), aliasedModuleNames = _a.aliasedModuleNames, unaliasedModuleNames = _a.unaliasedModuleNames, importAliasNames = _a.importAliasNames;
             var moduleName = ts.tryGetModuleNameFromFile(node, host, compilerOptions);
-            var umdHeader = ts.createFunctionExpression(undefined, undefined, undefined, undefined, [ts.createParameter(undefined, undefined, undefined, "factory")], undefined, ts.setTextRange(ts.createBlock([
+            var umdHeader = ts.createFunctionExpression(
+            /*modifiers*/ undefined, 
+            /*asteriskToken*/ undefined, 
+            /*name*/ undefined, 
+            /*typeParameters*/ undefined, [ts.createParameter(/*decorators*/ undefined, /*modifiers*/ undefined, /*dotDotDotToken*/ undefined, "factory")], 
+            /*type*/ undefined, ts.setTextRange(ts.createBlock([
                 ts.createIf(ts.createLogicalAnd(ts.createTypeCheck(ts.createIdentifier("module"), "object"), ts.createTypeCheck(ts.createPropertyAccess(ts.createIdentifier("module"), "exports"), "object")), ts.createBlock([
-                    ts.createVariableStatement(undefined, [
-                        ts.createVariableDeclaration("v", undefined, ts.createCall(ts.createIdentifier("factory"), undefined, [
+                    ts.createVariableStatement(
+                    /*modifiers*/ undefined, [
+                        ts.createVariableDeclaration("v", 
+                        /*type*/ undefined, ts.createCall(ts.createIdentifier("factory"), 
+                        /*typeArguments*/ undefined, [
                             ts.createIdentifier("require"),
                             ts.createIdentifier("exports")
                         ]))
                     ]),
-                    ts.setEmitFlags(ts.createIf(ts.createStrictInequality(ts.createIdentifier("v"), ts.createIdentifier("undefined")), ts.createStatement(ts.createAssignment(ts.createPropertyAccess(ts.createIdentifier("module"), "exports"), ts.createIdentifier("v")))), 1)
+                    ts.setEmitFlags(ts.createIf(ts.createStrictInequality(ts.createIdentifier("v"), ts.createIdentifier("undefined")), ts.createStatement(ts.createAssignment(ts.createPropertyAccess(ts.createIdentifier("module"), "exports"), ts.createIdentifier("v")))), 1 /* SingleLine */)
                 ]), ts.createIf(ts.createLogicalAnd(ts.createTypeCheck(ts.createIdentifier("define"), "function"), ts.createPropertyAccess(ts.createIdentifier("define"), "amd")), ts.createBlock([
-                    ts.createStatement(ts.createCall(ts.createIdentifier("define"), undefined, (moduleName ? [moduleName] : []).concat([
+                    ts.createStatement(ts.createCall(ts.createIdentifier("define"), 
+                    /*typeArguments*/ undefined, (moduleName ? [moduleName] : []).concat([
                         ts.createArrayLiteral([
                             ts.createLiteral("require"),
                             ts.createLiteral("exports")
@@ -57482,27 +71653,62 @@ var ts;
                         ts.createIdentifier("factory")
                     ])))
                 ])))
-            ], true), undefined));
+            ], 
+            /*multiLine*/ true), 
+            /*location*/ undefined));
+            // Create an updated SourceFile:
+            //
+            //  (function (factory) {
+            //      if (typeof module === "object" && typeof module.exports === "object") {
+            //          var v = factory(require, exports);
+            //          if (v !== undefined) module.exports = v;
+            //      }
+            //      else if (typeof define === 'function' && define.amd) {
+            //          define(["require", "exports"], factory);
+            //      }
+            //  })(function ...)
             var updated = ts.updateSourceFileNode(node, ts.setTextRange(ts.createNodeArray([
-                ts.createStatement(ts.createCall(umdHeader, undefined, [
-                    ts.createFunctionExpression(undefined, undefined, undefined, undefined, [
-                        ts.createParameter(undefined, undefined, undefined, "require"),
-                        ts.createParameter(undefined, undefined, undefined, "exports")
-                    ].concat(importAliasNames), undefined, transformAsynchronousModuleBody(node))
+                ts.createStatement(ts.createCall(umdHeader, 
+                /*typeArguments*/ undefined, [
+                    // Add the module body function argument:
+                    //
+                    //     function (require, exports) ...
+                    ts.createFunctionExpression(
+                    /*modifiers*/ undefined, 
+                    /*asteriskToken*/ undefined, 
+                    /*name*/ undefined, 
+                    /*typeParameters*/ undefined, [
+                        ts.createParameter(/*decorators*/ undefined, /*modifiers*/ undefined, /*dotDotDotToken*/ undefined, "require"),
+                        ts.createParameter(/*decorators*/ undefined, /*modifiers*/ undefined, /*dotDotDotToken*/ undefined, "exports")
+                    ].concat(importAliasNames), 
+                    /*type*/ undefined, transformAsynchronousModuleBody(node))
                 ]))
-            ]), node.statements));
+            ]), 
+            /*location*/ node.statements));
             ts.addEmitHelpers(updated, context.readEmitHelpers());
             return updated;
         }
+        /**
+         * Collect the additional asynchronous dependencies for the module.
+         *
+         * @param node The source file.
+         * @param includeNonAmdDependencies A value indicating whether to include non-AMD dependencies.
+         */
         function collectAsynchronousDependencies(node, includeNonAmdDependencies) {
+            // names of modules with corresponding parameter in the factory function
             var aliasedModuleNames = [];
+            // names of modules with no corresponding parameters in factory function
             var unaliasedModuleNames = [];
+            // names of the parameters in the factory function; these
+            // parameters need to match the indexes of the corresponding
+            // module names in aliasedModuleNames.
             var importAliasNames = [];
+            // Fill in amd-dependency tags
             for (var _i = 0, _a = node.amdDependencies; _i < _a.length; _i++) {
                 var amdDependency = _a[_i];
                 if (amdDependency.name) {
                     aliasedModuleNames.push(ts.createLiteral(amdDependency.path));
-                    importAliasNames.push(ts.createParameter(undefined, undefined, undefined, amdDependency.name));
+                    importAliasNames.push(ts.createParameter(/*decorators*/ undefined, /*modifiers*/ undefined, /*dotDotDotToken*/ undefined, amdDependency.name));
                 }
                 else {
                     unaliasedModuleNames.push(ts.createLiteral(amdDependency.path));
@@ -57510,13 +71716,20 @@ var ts;
             }
             for (var _b = 0, _c = currentModuleInfo.externalImports; _b < _c.length; _b++) {
                 var importNode = _c[_b];
+                // Find the name of the external module
                 var externalModuleName = ts.getExternalModuleNameLiteral(importNode, currentSourceFile, host, resolver, compilerOptions);
+                // Find the name of the module alias, if there is one
                 var importAliasName = ts.getLocalNameForExternalImport(importNode, currentSourceFile);
+                // It is possible that externalModuleName is undefined if it is not string literal.
+                // This can happen in the invalid import syntax.
+                // E.g : "import * from alias from 'someLib';"
                 if (externalModuleName) {
                     if (includeNonAmdDependencies && importAliasName) {
-                        ts.setEmitFlags(importAliasName, 4);
+                        // Set emitFlags on the name of the classDeclaration
+                        // This is so that when printer will not substitute the identifier
+                        ts.setEmitFlags(importAliasName, 4 /* NoSubstitution */);
                         aliasedModuleNames.push(externalModuleName);
-                        importAliasNames.push(ts.createParameter(undefined, undefined, undefined, importAliasName));
+                        importAliasNames.push(ts.createParameter(/*decorators*/ undefined, /*modifiers*/ undefined, /*dotDotDotToken*/ undefined, importAliasName));
                     }
                     else {
                         unaliasedModuleNames.push(externalModuleName);
@@ -57529,29 +71742,40 @@ var ts;
             if (ts.isImportEqualsDeclaration(node) || ts.isExportDeclaration(node) || !ts.getExternalModuleNameLiteral(node, currentSourceFile, host, resolver, compilerOptions)) {
                 return undefined;
             }
-            var name = ts.getLocalNameForExternalImport(node, currentSourceFile);
+            var name = ts.getLocalNameForExternalImport(node, currentSourceFile); // TODO: GH#18217
             var expr = getHelperExpressionForImport(node, name);
             if (expr === name) {
                 return undefined;
             }
             return ts.createStatement(ts.createAssignment(name, expr));
         }
+        /**
+         * Transforms a SourceFile into an AMD or UMD module body.
+         *
+         * @param node The SourceFile node.
+         */
         function transformAsynchronousModuleBody(node) {
             startLexicalEnvironment();
             var statements = [];
-            var statementOffset = ts.addPrologue(statements, node.statements, !compilerOptions.noImplicitUseStrict, sourceElementVisitor);
+            var statementOffset = ts.addPrologue(statements, node.statements, /*ensureUseStrict*/ !compilerOptions.noImplicitUseStrict, sourceElementVisitor);
             if (shouldEmitUnderscoreUnderscoreESModule()) {
                 ts.append(statements, createUnderscoreUnderscoreESModule());
             }
+            // Visit each statement of the module body.
             ts.append(statements, ts.visitNode(currentModuleInfo.externalHelpersImportDeclaration, sourceElementVisitor, ts.isStatement));
             if (moduleKind === ts.ModuleKind.AMD) {
                 ts.addRange(statements, ts.mapDefined(currentModuleInfo.externalImports, getAMDImportExpressionForImport));
             }
             ts.addRange(statements, ts.visitNodes(node.statements, sourceElementVisitor, ts.isStatement, statementOffset));
-            addExportEqualsIfNeeded(statements, true);
+            // Append the 'export =' statement if provided.
+            addExportEqualsIfNeeded(statements, /*emitAsReturn*/ true);
+            // End the lexical environment for the module body
+            // and merge any new lexical declarations.
             ts.prependStatements(statements, endLexicalEnvironment());
-            var body = ts.createBlock(statements, true);
+            var body = ts.createBlock(statements, /*multiLine*/ true);
             if (currentModuleInfo.hasExportStarsToExportValues && !compilerOptions.importHelpers) {
+                // If we have any `export * from ...` declarations
+                // we need to inform the emitter to add the __export helper.
                 ts.addEmitHelper(body, exportStarHelper);
             }
             if (needUMDDynamicImportHelper) {
@@ -57559,6 +71783,14 @@ var ts;
             }
             return body;
         }
+        /**
+         * Adds the down-level representation of `export=` to the statement list if one exists
+         * in the source file.
+         *
+         * @param statements The Statement list to modify.
+         * @param emitAsReturn A value indicating whether to emit the `export=` statement as a
+         * return statement.
+         */
         function addExportEqualsIfNeeded(statements, emitAsReturn) {
             if (currentModuleInfo.exportEquals) {
                 var expressionResult = ts.visitNode(currentModuleInfo.exportEquals.expression, moduleExpressionElementVisitor);
@@ -57566,50 +71798,60 @@ var ts;
                     if (emitAsReturn) {
                         var statement = ts.createReturn(expressionResult);
                         ts.setTextRange(statement, currentModuleInfo.exportEquals);
-                        ts.setEmitFlags(statement, 384 | 1536);
+                        ts.setEmitFlags(statement, 384 /* NoTokenSourceMaps */ | 1536 /* NoComments */);
                         statements.push(statement);
                     }
                     else {
                         var statement = ts.createStatement(ts.createAssignment(ts.createPropertyAccess(ts.createIdentifier("module"), "exports"), expressionResult));
                         ts.setTextRange(statement, currentModuleInfo.exportEquals);
-                        ts.setEmitFlags(statement, 1536);
+                        ts.setEmitFlags(statement, 1536 /* NoComments */);
                         statements.push(statement);
                     }
                 }
             }
         }
+        //
+        // Top-Level Source Element Visitors
+        //
+        /**
+         * Visits a node at the top level of the source file.
+         *
+         * @param node The node to visit.
+         */
         function sourceElementVisitor(node) {
             switch (node.kind) {
-                case 244:
+                case 244 /* ImportDeclaration */:
                     return visitImportDeclaration(node);
-                case 243:
+                case 243 /* ImportEqualsDeclaration */:
                     return visitImportEqualsDeclaration(node);
-                case 250:
+                case 250 /* ExportDeclaration */:
                     return visitExportDeclaration(node);
-                case 249:
+                case 249 /* ExportAssignment */:
                     return visitExportAssignment(node);
-                case 214:
+                case 214 /* VariableStatement */:
                     return visitVariableStatement(node);
-                case 234:
+                case 234 /* FunctionDeclaration */:
                     return visitFunctionDeclaration(node);
-                case 235:
+                case 235 /* ClassDeclaration */:
                     return visitClassDeclaration(node);
-                case 303:
+                case 303 /* MergeDeclarationMarker */:
                     return visitMergeDeclarationMarker(node);
-                case 304:
+                case 304 /* EndOfDeclarationMarker */:
                     return visitEndOfDeclarationMarker(node);
                 default:
                     return ts.visitEachChild(node, moduleExpressionElementVisitor, context);
             }
         }
         function moduleExpressionElementVisitor(node) {
-            if (!(node.transformFlags & 67108864) && !(node.transformFlags & 2048)) {
+            // This visitor does not need to descend into the tree if there is no dynamic import or destructuring assignment,
+            // as export/import statements are only transformed at the top level of a file.
+            if (!(node.transformFlags & 67108864 /* ContainsDynamicImport */) && !(node.transformFlags & 2048 /* ContainsDestructuringAssignment */)) {
                 return node;
             }
             if (ts.isImportCall(node)) {
                 return visitImportCallExpression(node);
             }
-            else if (node.transformFlags & 1024 && ts.isBinaryExpression(node)) {
+            else if (node.transformFlags & 1024 /* DestructuringAssignment */ && ts.isBinaryExpression(node)) {
                 return visitDestructuringAssignment(node);
             }
             else {
@@ -57621,24 +71863,24 @@ var ts;
                 for (var _i = 0, _a = node.properties; _i < _a.length; _i++) {
                     var elem = _a[_i];
                     switch (elem.kind) {
-                        case 270:
+                        case 270 /* PropertyAssignment */:
                             if (destructuringNeedsFlattening(elem.initializer)) {
                                 return true;
                             }
                             break;
-                        case 271:
+                        case 271 /* ShorthandPropertyAssignment */:
                             if (destructuringNeedsFlattening(elem.name)) {
                                 return true;
                             }
                             break;
-                        case 272:
+                        case 272 /* SpreadAssignment */:
                             if (destructuringNeedsFlattening(elem.expression)) {
                                 return true;
                             }
                             break;
-                        case 154:
-                        case 156:
-                        case 157:
+                        case 154 /* MethodDeclaration */:
+                        case 156 /* GetAccessor */:
+                        case 157 /* SetAccessor */:
                             return false;
                         default: ts.Debug.assertNever(elem, "Unhandled object member kind");
                     }
@@ -57664,13 +71906,13 @@ var ts;
         }
         function visitDestructuringAssignment(node) {
             if (destructuringNeedsFlattening(node.left)) {
-                return ts.flattenDestructuringAssignment(node, moduleExpressionElementVisitor, context, 0, false, createAllExportExpressions);
+                return ts.flattenDestructuringAssignment(node, moduleExpressionElementVisitor, context, 0 /* All */, /*needsValue*/ false, createAllExportExpressions);
             }
             return ts.visitEachChild(node, moduleExpressionElementVisitor, context);
         }
         function visitImportCallExpression(node) {
             var argument = ts.visitNode(ts.firstOrUndefined(node.arguments), moduleExpressionElementVisitor);
-            var containsLexicalThis = !!(node.transformFlags & 16384);
+            var containsLexicalThis = !!(node.transformFlags & 16384 /* ContainsLexicalThis */);
             switch (compilerOptions.module) {
                 case ts.ModuleKind.AMD:
                     return createImportCallExpressionAMD(argument, containsLexicalThis);
@@ -57682,103 +71924,181 @@ var ts;
             }
         }
         function createImportCallExpressionUMD(arg, containsLexicalThis) {
+            // (function (factory) {
+            //      ... (regular UMD)
+            // }
+            // })(function (require, exports, useSyncRequire) {
+            //      "use strict";
+            //      Object.defineProperty(exports, "__esModule", { value: true });
+            //      var __syncRequire = typeof module === "object" && typeof module.exports === "object";
+            //      var __resolved = new Promise(function (resolve) { resolve(); });
+            //      .....
+            //      __syncRequire
+            //          ? __resolved.then(function () { return require(x); }) /*CommonJs Require*/
+            //          : new Promise(function (_a, _b) { require([x], _a, _b); }); /*Amd Require*/
+            // });
             needUMDDynamicImportHelper = true;
             if (ts.isSimpleCopiableExpression(arg)) {
-                var argClone = ts.isGeneratedIdentifier(arg) ? arg : ts.isStringLiteral(arg) ? ts.createLiteral(arg) : ts.setEmitFlags(ts.setTextRange(ts.getSynthesizedClone(arg), arg), 1536);
-                return ts.createConditional(ts.createIdentifier("__syncRequire"), createImportCallExpressionCommonJS(arg, containsLexicalThis), createImportCallExpressionAMD(argClone, containsLexicalThis));
+                var argClone = ts.isGeneratedIdentifier(arg) ? arg : ts.isStringLiteral(arg) ? ts.createLiteral(arg) : ts.setEmitFlags(ts.setTextRange(ts.getSynthesizedClone(arg), arg), 1536 /* NoComments */);
+                return ts.createConditional(
+                /*condition*/ ts.createIdentifier("__syncRequire"), 
+                /*whenTrue*/ createImportCallExpressionCommonJS(arg, containsLexicalThis), 
+                /*whenFalse*/ createImportCallExpressionAMD(argClone, containsLexicalThis));
             }
             else {
                 var temp = ts.createTempVariable(hoistVariableDeclaration);
-                return ts.createComma(ts.createAssignment(temp, arg), ts.createConditional(ts.createIdentifier("__syncRequire"), createImportCallExpressionCommonJS(temp, containsLexicalThis), createImportCallExpressionAMD(temp, containsLexicalThis)));
+                return ts.createComma(ts.createAssignment(temp, arg), ts.createConditional(
+                /*condition*/ ts.createIdentifier("__syncRequire"), 
+                /*whenTrue*/ createImportCallExpressionCommonJS(temp, containsLexicalThis), 
+                /*whenFalse*/ createImportCallExpressionAMD(temp, containsLexicalThis)));
             }
         }
         function createImportCallExpressionAMD(arg, containsLexicalThis) {
+            // improt("./blah")
+            // emit as
+            // define(["require", "exports", "blah"], function (require, exports) {
+            //     ...
+            //     new Promise(function (_a, _b) { require([x], _a, _b); }); /*Amd Require*/
+            // });
             var resolve = ts.createUniqueName("resolve");
             var reject = ts.createUniqueName("reject");
             var parameters = [
-                ts.createParameter(undefined, undefined, undefined, resolve),
-                ts.createParameter(undefined, undefined, undefined, reject)
+                ts.createParameter(/*decorator*/ undefined, /*modifiers*/ undefined, /*dotDotDotToken*/ undefined, /*name*/ resolve),
+                ts.createParameter(/*decorator*/ undefined, /*modifiers*/ undefined, /*dotDotDotToken*/ undefined, /*name*/ reject)
             ];
             var body = ts.createBlock([
-                ts.createStatement(ts.createCall(ts.createIdentifier("require"), undefined, [ts.createArrayLiteral([arg || ts.createOmittedExpression()]), resolve, reject]))
+                ts.createStatement(ts.createCall(ts.createIdentifier("require"), 
+                /*typeArguments*/ undefined, [ts.createArrayLiteral([arg || ts.createOmittedExpression()]), resolve, reject]))
             ]);
             var func;
-            if (languageVersion >= 2) {
-                func = ts.createArrowFunction(undefined, undefined, parameters, undefined, undefined, body);
+            if (languageVersion >= 2 /* ES2015 */) {
+                func = ts.createArrowFunction(
+                /*modifiers*/ undefined, 
+                /*typeParameters*/ undefined, parameters, 
+                /*type*/ undefined, 
+                /*equalsGreaterThanToken*/ undefined, body);
             }
             else {
-                func = ts.createFunctionExpression(undefined, undefined, undefined, undefined, parameters, undefined, body);
+                func = ts.createFunctionExpression(
+                /*modifiers*/ undefined, 
+                /*asteriskToken*/ undefined, 
+                /*name*/ undefined, 
+                /*typeParameters*/ undefined, parameters, 
+                /*type*/ undefined, body);
+                // if there is a lexical 'this' in the import call arguments, ensure we indicate
+                // that this new function expression indicates it captures 'this' so that the
+                // es2015 transformer will properly substitute 'this' with '_this'.
                 if (containsLexicalThis) {
-                    ts.setEmitFlags(func, 8);
+                    ts.setEmitFlags(func, 8 /* CapturesThis */);
                 }
             }
-            var promise = ts.createNew(ts.createIdentifier("Promise"), undefined, [func]);
+            var promise = ts.createNew(ts.createIdentifier("Promise"), /*typeArguments*/ undefined, [func]);
             if (compilerOptions.esModuleInterop) {
                 context.requestEmitHelper(importStarHelper);
-                return ts.createCall(ts.createPropertyAccess(promise, ts.createIdentifier("then")), undefined, [ts.getHelperName("__importStar")]);
+                return ts.createCall(ts.createPropertyAccess(promise, ts.createIdentifier("then")), /*typeArguments*/ undefined, [ts.getHelperName("__importStar")]);
             }
             return promise;
         }
         function createImportCallExpressionCommonJS(arg, containsLexicalThis) {
-            var promiseResolveCall = ts.createCall(ts.createPropertyAccess(ts.createIdentifier("Promise"), "resolve"), undefined, []);
-            var requireCall = ts.createCall(ts.createIdentifier("require"), undefined, arg ? [arg] : []);
+            // import("./blah")
+            // emit as
+            // Promise.resolve().then(function () { return require(x); }) /*CommonJs Require*/
+            // We have to wrap require in then callback so that require is done in asynchronously
+            // if we simply do require in resolve callback in Promise constructor. We will execute the loading immediately
+            var promiseResolveCall = ts.createCall(ts.createPropertyAccess(ts.createIdentifier("Promise"), "resolve"), /*typeArguments*/ undefined, /*argumentsArray*/ []);
+            var requireCall = ts.createCall(ts.createIdentifier("require"), /*typeArguments*/ undefined, arg ? [arg] : []);
             if (compilerOptions.esModuleInterop) {
                 context.requestEmitHelper(importStarHelper);
-                requireCall = ts.createCall(ts.getHelperName("__importStar"), undefined, [requireCall]);
+                requireCall = ts.createCall(ts.getHelperName("__importStar"), /*typeArguments*/ undefined, [requireCall]);
             }
             var func;
-            if (languageVersion >= 2) {
-                func = ts.createArrowFunction(undefined, undefined, [], undefined, undefined, requireCall);
+            if (languageVersion >= 2 /* ES2015 */) {
+                func = ts.createArrowFunction(
+                /*modifiers*/ undefined, 
+                /*typeParameters*/ undefined, 
+                /*parameters*/ [], 
+                /*type*/ undefined, 
+                /*equalsGreaterThanToken*/ undefined, requireCall);
             }
             else {
-                func = ts.createFunctionExpression(undefined, undefined, undefined, undefined, [], undefined, ts.createBlock([ts.createReturn(requireCall)]));
+                func = ts.createFunctionExpression(
+                /*modifiers*/ undefined, 
+                /*asteriskToken*/ undefined, 
+                /*name*/ undefined, 
+                /*typeParameters*/ undefined, 
+                /*parameters*/ [], 
+                /*type*/ undefined, ts.createBlock([ts.createReturn(requireCall)]));
+                // if there is a lexical 'this' in the import call arguments, ensure we indicate
+                // that this new function expression indicates it captures 'this' so that the
+                // es2015 transformer will properly substitute 'this' with '_this'.
                 if (containsLexicalThis) {
-                    ts.setEmitFlags(func, 8);
+                    ts.setEmitFlags(func, 8 /* CapturesThis */);
                 }
             }
-            return ts.createCall(ts.createPropertyAccess(promiseResolveCall, "then"), undefined, [func]);
+            return ts.createCall(ts.createPropertyAccess(promiseResolveCall, "then"), /*typeArguments*/ undefined, [func]);
         }
         function getHelperExpressionForImport(node, innerExpr) {
-            if (!compilerOptions.esModuleInterop || ts.getEmitFlags(node) & 67108864) {
+            if (!compilerOptions.esModuleInterop || ts.getEmitFlags(node) & 67108864 /* NeverApplyImportHelper */) {
                 return innerExpr;
             }
             if (ts.getImportNeedsImportStarHelper(node)) {
                 context.requestEmitHelper(importStarHelper);
-                return ts.createCall(ts.getHelperName("__importStar"), undefined, [innerExpr]);
+                return ts.createCall(ts.getHelperName("__importStar"), /*typeArguments*/ undefined, [innerExpr]);
             }
             if (ts.getImportNeedsImportDefaultHelper(node)) {
                 context.requestEmitHelper(importDefaultHelper);
-                return ts.createCall(ts.getHelperName("__importDefault"), undefined, [innerExpr]);
+                return ts.createCall(ts.getHelperName("__importDefault"), /*typeArguments*/ undefined, [innerExpr]);
             }
             return innerExpr;
         }
+        /**
+         * Visits an ImportDeclaration node.
+         *
+         * @param node The node to visit.
+         */
         function visitImportDeclaration(node) {
             var statements;
             var namespaceDeclaration = ts.getNamespaceDeclarationNode(node);
             if (moduleKind !== ts.ModuleKind.AMD) {
                 if (!node.importClause) {
+                    // import "mod";
                     return ts.setTextRange(ts.createStatement(createRequireCall(node)), node);
                 }
                 else {
                     var variables = [];
                     if (namespaceDeclaration && !ts.isDefaultImport(node)) {
-                        variables.push(ts.createVariableDeclaration(ts.getSynthesizedClone(namespaceDeclaration.name), undefined, getHelperExpressionForImport(node, createRequireCall(node))));
+                        // import * as n from "mod";
+                        variables.push(ts.createVariableDeclaration(ts.getSynthesizedClone(namespaceDeclaration.name), 
+                        /*type*/ undefined, getHelperExpressionForImport(node, createRequireCall(node))));
                     }
                     else {
-                        variables.push(ts.createVariableDeclaration(ts.getGeneratedNameForNode(node), undefined, getHelperExpressionForImport(node, createRequireCall(node))));
+                        // import d from "mod";
+                        // import { x, y } from "mod";
+                        // import d, { x, y } from "mod";
+                        // import d, * as n from "mod";
+                        variables.push(ts.createVariableDeclaration(ts.getGeneratedNameForNode(node), 
+                        /*type*/ undefined, getHelperExpressionForImport(node, createRequireCall(node))));
                         if (namespaceDeclaration && ts.isDefaultImport(node)) {
-                            variables.push(ts.createVariableDeclaration(ts.getSynthesizedClone(namespaceDeclaration.name), undefined, ts.getGeneratedNameForNode(node)));
+                            variables.push(ts.createVariableDeclaration(ts.getSynthesizedClone(namespaceDeclaration.name), 
+                            /*type*/ undefined, ts.getGeneratedNameForNode(node)));
                         }
                     }
-                    statements = ts.append(statements, ts.setTextRange(ts.createVariableStatement(undefined, ts.createVariableDeclarationList(variables, languageVersion >= 2 ? 2 : 0)), node));
+                    statements = ts.append(statements, ts.setTextRange(ts.createVariableStatement(
+                    /*modifiers*/ undefined, ts.createVariableDeclarationList(variables, languageVersion >= 2 /* ES2015 */ ? 2 /* Const */ : 0 /* None */)), 
+                    /*location*/ node));
                 }
             }
             else if (namespaceDeclaration && ts.isDefaultImport(node)) {
-                statements = ts.append(statements, ts.createVariableStatement(undefined, ts.createVariableDeclarationList([
-                    ts.setTextRange(ts.createVariableDeclaration(ts.getSynthesizedClone(namespaceDeclaration.name), undefined, ts.getGeneratedNameForNode(node)), node)
-                ], languageVersion >= 2 ? 2 : 0)));
+                // import d, * as n from "mod";
+                statements = ts.append(statements, ts.createVariableStatement(
+                /*modifiers*/ undefined, ts.createVariableDeclarationList([
+                    ts.setTextRange(ts.createVariableDeclaration(ts.getSynthesizedClone(namespaceDeclaration.name), 
+                    /*type*/ undefined, ts.getGeneratedNameForNode(node)), 
+                    /*location*/ node)
+                ], languageVersion >= 2 /* ES2015 */ ? 2 /* Const */ : 0 /* None */)));
             }
             if (hasAssociatedEndOfDeclarationMarker(node)) {
+                // Defer exports until we encounter an EndOfDeclarationMarker node
                 var id = ts.getOriginalNodeId(node);
                 deferredExports[id] = appendExportsOfImportDeclaration(deferredExports[id], node);
             }
@@ -57787,33 +72107,47 @@ var ts;
             }
             return ts.singleOrMany(statements);
         }
+        /**
+         * Creates a `require()` call to import an external module.
+         *
+         * @param importNode The declararation to import.
+         */
         function createRequireCall(importNode) {
             var moduleName = ts.getExternalModuleNameLiteral(importNode, currentSourceFile, host, resolver, compilerOptions);
             var args = [];
             if (moduleName) {
                 args.push(moduleName);
             }
-            return ts.createCall(ts.createIdentifier("require"), undefined, args);
+            return ts.createCall(ts.createIdentifier("require"), /*typeArguments*/ undefined, args);
         }
+        /**
+         * Visits an ImportEqualsDeclaration node.
+         *
+         * @param node The node to visit.
+         */
         function visitImportEqualsDeclaration(node) {
             ts.Debug.assert(ts.isExternalModuleImportEqualsDeclaration(node), "import= for internal module references should be handled in an earlier transformer.");
             var statements;
             if (moduleKind !== ts.ModuleKind.AMD) {
-                if (ts.hasModifier(node, 1)) {
+                if (ts.hasModifier(node, 1 /* Export */)) {
                     statements = ts.append(statements, ts.setTextRange(ts.createStatement(createExportExpression(node.name, createRequireCall(node))), node));
                 }
                 else {
-                    statements = ts.append(statements, ts.setTextRange(ts.createVariableStatement(undefined, ts.createVariableDeclarationList([
-                        ts.createVariableDeclaration(ts.getSynthesizedClone(node.name), undefined, createRequireCall(node))
-                    ], languageVersion >= 2 ? 2 : 0)), node));
+                    statements = ts.append(statements, ts.setTextRange(ts.createVariableStatement(
+                    /*modifiers*/ undefined, ts.createVariableDeclarationList([
+                        ts.createVariableDeclaration(ts.getSynthesizedClone(node.name), 
+                        /*type*/ undefined, createRequireCall(node))
+                    ], 
+                    /*flags*/ languageVersion >= 2 /* ES2015 */ ? 2 /* Const */ : 0 /* None */)), node));
                 }
             }
             else {
-                if (ts.hasModifier(node, 1)) {
+                if (ts.hasModifier(node, 1 /* Export */)) {
                     statements = ts.append(statements, ts.setTextRange(ts.createStatement(createExportExpression(ts.getExportName(node), ts.getLocalName(node))), node));
                 }
             }
             if (hasAssociatedEndOfDeclarationMarker(node)) {
+                // Defer exports until we encounter an EndOfDeclarationMarker node
                 var id = ts.getOriginalNodeId(node);
                 deferredExports[id] = appendExportsOfImportEqualsDeclaration(deferredExports[id], node);
             }
@@ -57822,17 +72156,28 @@ var ts;
             }
             return ts.singleOrMany(statements);
         }
+        /**
+         * Visits an ExportDeclaration node.
+         *
+         * @param The node to visit.
+         */
         function visitExportDeclaration(node) {
             if (!node.moduleSpecifier) {
+                // Elide export declarations with no module specifier as they are handled
+                // elsewhere.
                 return undefined;
             }
             var generatedName = ts.getGeneratedNameForNode(node);
             if (node.exportClause) {
                 var statements = [];
+                // export { x, y } from "mod";
                 if (moduleKind !== ts.ModuleKind.AMD) {
-                    statements.push(ts.setTextRange(ts.createVariableStatement(undefined, ts.createVariableDeclarationList([
-                        ts.createVariableDeclaration(generatedName, undefined, createRequireCall(node))
-                    ])), node));
+                    statements.push(ts.setTextRange(ts.createVariableStatement(
+                    /*modifiers*/ undefined, ts.createVariableDeclarationList([
+                        ts.createVariableDeclaration(generatedName, 
+                        /*type*/ undefined, createRequireCall(node))
+                    ])), 
+                    /*location*/ node));
                 }
                 for (var _i = 0, _a = node.exportClause.elements; _i < _a.length; _i++) {
                     var specifier = _a[_i];
@@ -57842,9 +72187,15 @@ var ts;
                 return ts.singleOrMany(statements);
             }
             else {
+                // export * from "mod";
                 return ts.setTextRange(ts.createStatement(createExportStarHelper(context, moduleKind !== ts.ModuleKind.AMD ? createRequireCall(node) : generatedName)), node);
             }
         }
+        /**
+         * Visits an ExportAssignment node.
+         *
+         * @param node The node to visit.
+         */
         function visitExportAssignment(node) {
             if (node.isExportEquals) {
                 return undefined;
@@ -57852,23 +72203,35 @@ var ts;
             var statements;
             var original = node.original;
             if (original && hasAssociatedEndOfDeclarationMarker(original)) {
+                // Defer exports until we encounter an EndOfDeclarationMarker node
                 var id = ts.getOriginalNodeId(node);
-                deferredExports[id] = appendExportStatement(deferredExports[id], ts.createIdentifier("default"), ts.visitNode(node.expression, moduleExpressionElementVisitor), node, true);
+                deferredExports[id] = appendExportStatement(deferredExports[id], ts.createIdentifier("default"), ts.visitNode(node.expression, moduleExpressionElementVisitor), /*location*/ node, /*allowComments*/ true);
             }
             else {
-                statements = appendExportStatement(statements, ts.createIdentifier("default"), ts.visitNode(node.expression, moduleExpressionElementVisitor), node, true);
+                statements = appendExportStatement(statements, ts.createIdentifier("default"), ts.visitNode(node.expression, moduleExpressionElementVisitor), /*location*/ node, /*allowComments*/ true);
             }
             return ts.singleOrMany(statements);
         }
+        /**
+         * Visits a FunctionDeclaration node.
+         *
+         * @param node The node to visit.
+         */
         function visitFunctionDeclaration(node) {
             var statements;
-            if (ts.hasModifier(node, 1)) {
-                statements = ts.append(statements, ts.setOriginalNode(ts.setTextRange(ts.createFunctionDeclaration(undefined, ts.visitNodes(node.modifiers, modifierVisitor, ts.isModifier), node.asteriskToken, ts.getDeclarationName(node, true, true), undefined, ts.visitNodes(node.parameters, moduleExpressionElementVisitor), undefined, ts.visitEachChild(node.body, moduleExpressionElementVisitor, context)), node), node));
+            if (ts.hasModifier(node, 1 /* Export */)) {
+                statements = ts.append(statements, ts.setOriginalNode(ts.setTextRange(ts.createFunctionDeclaration(
+                /*decorators*/ undefined, ts.visitNodes(node.modifiers, modifierVisitor, ts.isModifier), node.asteriskToken, ts.getDeclarationName(node, /*allowComments*/ true, /*allowSourceMaps*/ true), 
+                /*typeParameters*/ undefined, ts.visitNodes(node.parameters, moduleExpressionElementVisitor), 
+                /*type*/ undefined, ts.visitEachChild(node.body, moduleExpressionElementVisitor, context)), 
+                /*location*/ node), 
+                /*original*/ node));
             }
             else {
                 statements = ts.append(statements, ts.visitEachChild(node, moduleExpressionElementVisitor, context));
             }
             if (hasAssociatedEndOfDeclarationMarker(node)) {
+                // Defer exports until we encounter an EndOfDeclarationMarker node
                 var id = ts.getOriginalNodeId(node);
                 deferredExports[id] = appendExportsOfHoistedDeclaration(deferredExports[id], node);
             }
@@ -57877,15 +72240,23 @@ var ts;
             }
             return ts.singleOrMany(statements);
         }
+        /**
+         * Visits a ClassDeclaration node.
+         *
+         * @param node The node to visit.
+         */
         function visitClassDeclaration(node) {
             var statements;
-            if (ts.hasModifier(node, 1)) {
-                statements = ts.append(statements, ts.setOriginalNode(ts.setTextRange(ts.createClassDeclaration(undefined, ts.visitNodes(node.modifiers, modifierVisitor, ts.isModifier), ts.getDeclarationName(node, true, true), undefined, ts.visitNodes(node.heritageClauses, moduleExpressionElementVisitor), ts.visitNodes(node.members, moduleExpressionElementVisitor)), node), node));
+            if (ts.hasModifier(node, 1 /* Export */)) {
+                statements = ts.append(statements, ts.setOriginalNode(ts.setTextRange(ts.createClassDeclaration(
+                /*decorators*/ undefined, ts.visitNodes(node.modifiers, modifierVisitor, ts.isModifier), ts.getDeclarationName(node, /*allowComments*/ true, /*allowSourceMaps*/ true), 
+                /*typeParameters*/ undefined, ts.visitNodes(node.heritageClauses, moduleExpressionElementVisitor), ts.visitNodes(node.members, moduleExpressionElementVisitor)), node), node));
             }
             else {
                 statements = ts.append(statements, ts.visitEachChild(node, moduleExpressionElementVisitor, context));
             }
             if (hasAssociatedEndOfDeclarationMarker(node)) {
+                // Defer exports until we encounter an EndOfDeclarationMarker node
                 var id = ts.getOriginalNodeId(node);
                 deferredExports[id] = appendExportsOfHoistedDeclaration(deferredExports[id], node);
             }
@@ -57894,12 +72265,19 @@ var ts;
             }
             return ts.singleOrMany(statements);
         }
+        /**
+         * Visits a VariableStatement node.
+         *
+         * @param node The node to visit.
+         */
         function visitVariableStatement(node) {
             var statements;
             var variables;
             var expressions;
-            if (ts.hasModifier(node, 1)) {
+            if (ts.hasModifier(node, 1 /* Export */)) {
                 var modifiers = void 0;
+                // If we're exporting these variables, then these just become assignments to 'exports.x'.
+                // We only want to emit assignments for variables with initializers.
                 for (var _i = 0, _a = node.declarationList.declarations; _i < _a.length; _i++) {
                     var variable = _a[_i];
                     if (ts.isIdentifier(variable.name) && ts.isLocalName(variable.name)) {
@@ -57923,6 +72301,7 @@ var ts;
                 statements = ts.append(statements, ts.visitEachChild(node, moduleExpressionElementVisitor, context));
             }
             if (hasAssociatedEndOfDeclarationMarker(node)) {
+                // Defer exports until we encounter an EndOfDeclarationMarker node
                 var id = ts.getOriginalNodeId(node);
                 deferredExports[id] = appendExportsOfVariableStatement(deferredExports[id], node);
             }
@@ -57934,35 +72313,72 @@ var ts;
         function createAllExportExpressions(name, value, location) {
             var exportedNames = getExports(name);
             if (exportedNames) {
+                // For each additional export of the declaration, apply an export assignment.
                 var expression = ts.isExportName(name) ? value : ts.createAssignment(name, value);
                 for (var _i = 0, exportedNames_1 = exportedNames; _i < exportedNames_1.length; _i++) {
                     var exportName = exportedNames_1[_i];
-                    ts.setEmitFlags(expression, 4);
-                    expression = createExportExpression(exportName, expression, location);
+                    // Mark the node to prevent triggering substitution.
+                    ts.setEmitFlags(expression, 4 /* NoSubstitution */);
+                    expression = createExportExpression(exportName, expression, /*location*/ location);
                 }
                 return expression;
             }
             return ts.createAssignment(name, value);
         }
+        /**
+         * Transforms an exported variable with an initializer into an expression.
+         *
+         * @param node The node to transform.
+         */
         function transformInitializedVariable(node) {
             if (ts.isBindingPattern(node.name)) {
-                return ts.flattenDestructuringAssignment(ts.visitNode(node, moduleExpressionElementVisitor), undefined, context, 0, false, createAllExportExpressions);
+                return ts.flattenDestructuringAssignment(ts.visitNode(node, moduleExpressionElementVisitor), 
+                /*visitor*/ undefined, context, 0 /* All */, 
+                /*needsValue*/ false, createAllExportExpressions);
             }
             else {
-                return ts.createAssignment(ts.setTextRange(ts.createPropertyAccess(ts.createIdentifier("exports"), node.name), node.name), ts.visitNode(node.initializer, moduleExpressionElementVisitor));
+                return ts.createAssignment(ts.setTextRange(ts.createPropertyAccess(ts.createIdentifier("exports"), node.name), 
+                /*location*/ node.name), ts.visitNode(node.initializer, moduleExpressionElementVisitor));
             }
         }
+        /**
+         * Visits a MergeDeclarationMarker used as a placeholder for the beginning of a merged
+         * and transformed declaration.
+         *
+         * @param node The node to visit.
+         */
         function visitMergeDeclarationMarker(node) {
-            if (hasAssociatedEndOfDeclarationMarker(node) && node.original.kind === 214) {
+            // For an EnumDeclaration or ModuleDeclaration that merges with a preceeding
+            // declaration we do not emit a leading variable declaration. To preserve the
+            // begin/end semantics of the declararation and to properly handle exports
+            // we wrapped the leading variable declaration in a `MergeDeclarationMarker`.
+            //
+            // To balance the declaration, add the exports of the elided variable
+            // statement.
+            if (hasAssociatedEndOfDeclarationMarker(node) && node.original.kind === 214 /* VariableStatement */) {
                 var id = ts.getOriginalNodeId(node);
                 deferredExports[id] = appendExportsOfVariableStatement(deferredExports[id], node.original);
             }
             return node;
         }
+        /**
+         * Determines whether a node has an associated EndOfDeclarationMarker.
+         *
+         * @param node The node to test.
+         */
         function hasAssociatedEndOfDeclarationMarker(node) {
-            return (ts.getEmitFlags(node) & 4194304) !== 0;
+            return (ts.getEmitFlags(node) & 4194304 /* HasEndOfDeclarationMarker */) !== 0;
         }
+        /**
+         * Visits a DeclarationMarker used as a placeholder for the end of a transformed
+         * declaration.
+         *
+         * @param node The node to visit.
+         */
         function visitEndOfDeclarationMarker(node) {
+            // For some transformations we emit an `EndOfDeclarationMarker` to mark the actual
+            // end of the transformed declaration. We use this marker to emit any deferred exports
+            // of the declaration.
             var id = ts.getOriginalNodeId(node);
             var statements = deferredExports[id];
             if (statements) {
@@ -57971,6 +72387,15 @@ var ts;
             }
             return node;
         }
+        /**
+         * Appends the exports of an ImportDeclaration to a statement list, returning the
+         * statement list.
+         *
+         * @param statements A statement list to which the down-level export statements are to be
+         * appended. If `statements` is `undefined`, a new array is allocated if statements are
+         * appended.
+         * @param decl The declaration whose exports are to be recorded.
+         */
         function appendExportsOfImportDeclaration(statements, decl) {
             if (currentModuleInfo.exportEquals) {
                 return statements;
@@ -57985,10 +72410,10 @@ var ts;
             var namedBindings = importClause.namedBindings;
             if (namedBindings) {
                 switch (namedBindings.kind) {
-                    case 246:
+                    case 246 /* NamespaceImport */:
                         statements = appendExportsOfDeclaration(statements, namedBindings);
                         break;
-                    case 247:
+                    case 247 /* NamedImports */:
                         for (var _i = 0, _a = namedBindings.elements; _i < _a.length; _i++) {
                             var importBinding = _a[_i];
                             statements = appendExportsOfDeclaration(statements, importBinding);
@@ -57998,12 +72423,30 @@ var ts;
             }
             return statements;
         }
+        /**
+         * Appends the exports of an ImportEqualsDeclaration to a statement list, returning the
+         * statement list.
+         *
+         * @param statements A statement list to which the down-level export statements are to be
+         * appended. If `statements` is `undefined`, a new array is allocated if statements are
+         * appended.
+         * @param decl The declaration whose exports are to be recorded.
+         */
         function appendExportsOfImportEqualsDeclaration(statements, decl) {
             if (currentModuleInfo.exportEquals) {
                 return statements;
             }
             return appendExportsOfDeclaration(statements, decl);
         }
+        /**
+         * Appends the exports of a VariableStatement to a statement list, returning the statement
+         * list.
+         *
+         * @param statements A statement list to which the down-level export statements are to be
+         * appended. If `statements` is `undefined`, a new array is allocated if statements are
+         * appended.
+         * @param node The VariableStatement whose exports are to be recorded.
+         */
         function appendExportsOfVariableStatement(statements, node) {
             if (currentModuleInfo.exportEquals) {
                 return statements;
@@ -58014,6 +72457,15 @@ var ts;
             }
             return statements;
         }
+        /**
+         * Appends the exports of a VariableDeclaration or BindingElement to a statement list,
+         * returning the statement list.
+         *
+         * @param statements A statement list to which the down-level export statements are to be
+         * appended. If `statements` is `undefined`, a new array is allocated if statements are
+         * appended.
+         * @param decl The declaration whose exports are to be recorded.
+         */
         function appendExportsOfBindingElement(statements, decl) {
             if (currentModuleInfo.exportEquals) {
                 return statements;
@@ -58031,72 +72483,136 @@ var ts;
             }
             return statements;
         }
+        /**
+         * Appends the exports of a ClassDeclaration or FunctionDeclaration to a statement list,
+         * returning the statement list.
+         *
+         * @param statements A statement list to which the down-level export statements are to be
+         * appended. If `statements` is `undefined`, a new array is allocated if statements are
+         * appended.
+         * @param decl The declaration whose exports are to be recorded.
+         */
         function appendExportsOfHoistedDeclaration(statements, decl) {
             if (currentModuleInfo.exportEquals) {
                 return statements;
             }
-            if (ts.hasModifier(decl, 1)) {
-                var exportName = ts.hasModifier(decl, 512) ? ts.createIdentifier("default") : ts.getDeclarationName(decl);
-                statements = appendExportStatement(statements, exportName, ts.getLocalName(decl), decl);
+            if (ts.hasModifier(decl, 1 /* Export */)) {
+                var exportName = ts.hasModifier(decl, 512 /* Default */) ? ts.createIdentifier("default") : ts.getDeclarationName(decl);
+                statements = appendExportStatement(statements, exportName, ts.getLocalName(decl), /*location*/ decl);
             }
             if (decl.name) {
                 statements = appendExportsOfDeclaration(statements, decl);
             }
             return statements;
         }
+        /**
+         * Appends the exports of a declaration to a statement list, returning the statement list.
+         *
+         * @param statements A statement list to which the down-level export statements are to be
+         * appended. If `statements` is `undefined`, a new array is allocated if statements are
+         * appended.
+         * @param decl The declaration to export.
+         */
         function appendExportsOfDeclaration(statements, decl) {
             var name = ts.getDeclarationName(decl);
             var exportSpecifiers = currentModuleInfo.exportSpecifiers.get(ts.idText(name));
             if (exportSpecifiers) {
                 for (var _i = 0, exportSpecifiers_1 = exportSpecifiers; _i < exportSpecifiers_1.length; _i++) {
                     var exportSpecifier = exportSpecifiers_1[_i];
-                    statements = appendExportStatement(statements, exportSpecifier.name, name, exportSpecifier.name);
+                    statements = appendExportStatement(statements, exportSpecifier.name, name, /*location*/ exportSpecifier.name);
                 }
             }
             return statements;
         }
+        /**
+         * Appends the down-level representation of an export to a statement list, returning the
+         * statement list.
+         *
+         * @param statements A statement list to which the down-level export statements are to be
+         * appended. If `statements` is `undefined`, a new array is allocated if statements are
+         * appended.
+         * @param exportName The name of the export.
+         * @param expression The expression to export.
+         * @param location The location to use for source maps and comments for the export.
+         * @param allowComments Whether to allow comments on the export.
+         */
         function appendExportStatement(statements, exportName, expression, location, allowComments) {
             statements = ts.append(statements, createExportStatement(exportName, expression, location, allowComments));
             return statements;
         }
         function createUnderscoreUnderscoreESModule() {
             var statement;
-            if (languageVersion === 0) {
-                statement = ts.createStatement(createExportExpression(ts.createIdentifier("__esModule"), ts.createLiteral(true)));
+            if (languageVersion === 0 /* ES3 */) {
+                statement = ts.createStatement(createExportExpression(ts.createIdentifier("__esModule"), ts.createLiteral(/*value*/ true)));
             }
             else {
-                statement = ts.createStatement(ts.createCall(ts.createPropertyAccess(ts.createIdentifier("Object"), "defineProperty"), undefined, [
+                statement = ts.createStatement(ts.createCall(ts.createPropertyAccess(ts.createIdentifier("Object"), "defineProperty"), 
+                /*typeArguments*/ undefined, [
                     ts.createIdentifier("exports"),
                     ts.createLiteral("__esModule"),
                     ts.createObjectLiteral([
-                        ts.createPropertyAssignment("value", ts.createLiteral(true))
+                        ts.createPropertyAssignment("value", ts.createLiteral(/*value*/ true))
                     ])
                 ]));
             }
-            ts.setEmitFlags(statement, 1048576);
+            ts.setEmitFlags(statement, 1048576 /* CustomPrologue */);
             return statement;
         }
+        /**
+         * Creates a call to the current file's export function to export a value.
+         *
+         * @param name The bound name of the export.
+         * @param value The exported value.
+         * @param location The location to use for source maps and comments for the export.
+         * @param allowComments An optional value indicating whether to emit comments for the statement.
+         */
         function createExportStatement(name, value, location, allowComments) {
             var statement = ts.setTextRange(ts.createStatement(createExportExpression(name, value)), location);
             ts.startOnNewLine(statement);
             if (!allowComments) {
-                ts.setEmitFlags(statement, 1536);
+                ts.setEmitFlags(statement, 1536 /* NoComments */);
             }
             return statement;
         }
+        /**
+         * Creates a call to the current file's export function to export a value.
+         *
+         * @param name The bound name of the export.
+         * @param value The exported value.
+         * @param location The location to use for source maps and comments for the export.
+         */
         function createExportExpression(name, value, location) {
             return ts.setTextRange(ts.createAssignment(ts.createPropertyAccess(ts.createIdentifier("exports"), ts.getSynthesizedClone(name)), value), location);
         }
+        //
+        // Modifier Visitors
+        //
+        /**
+         * Visit nodes to elide module-specific modifiers.
+         *
+         * @param node The node to visit.
+         */
         function modifierVisitor(node) {
+            // Elide module-specific modifiers.
             switch (node.kind) {
-                case 84:
-                case 79:
+                case 84 /* ExportKeyword */:
+                case 79 /* DefaultKeyword */:
                     return undefined;
             }
             return node;
         }
+        //
+        // Emit Notification
+        //
+        /**
+         * Hook for node emit notifications.
+         *
+         * @param hint A hint as to the intended usage of the node.
+         * @param node The node to emit.
+         * @param emit A callback used to emit the node in the printer.
+         */
         function onEmitNode(hint, node, emitCallback) {
-            if (node.kind === 274) {
+            if (node.kind === 274 /* SourceFile */) {
                 currentSourceFile = node;
                 currentModuleInfo = moduleInfoMap[ts.getOriginalNodeId(currentSourceFile)];
                 noSubstitution = [];
@@ -58109,12 +72625,21 @@ var ts;
                 previousOnEmitNode(hint, node, emitCallback);
             }
         }
+        //
+        // Substitutions
+        //
+        /**
+         * Hooks node substitutions.
+         *
+         * @param hint A hint as to the intended usage of the node.
+         * @param node The node to substitute.
+         */
         function onSubstituteNode(hint, node) {
             node = previousOnSubstituteNode(hint, node);
             if (node.id && noSubstitution[node.id]) {
                 return node;
             }
-            if (hint === 1) {
+            if (hint === 1 /* Expression */) {
                 return substituteExpression(node);
             }
             else if (ts.isShorthandPropertyAssignment(node)) {
@@ -58122,10 +72647,18 @@ var ts;
             }
             return node;
         }
+        /**
+         * Substitution for a ShorthandPropertyAssignment whose declaration name is an imported
+         * or exported symbol.
+         *
+         * @param node The node to substitute.
+         */
         function substituteShorthandPropertyAssignment(node) {
             var name = node.name;
             var exportedOrImportedName = substituteExpressionIdentifier(name);
             if (exportedOrImportedName !== name) {
+                // A shorthand property with an assignment initializer is probably part of a
+                // destructuring assignment
                 if (node.objectAssignmentInitializer) {
                     var initializer = ts.createAssignment(exportedOrImportedName, node.objectAssignmentInitializer);
                     return ts.setTextRange(ts.createPropertyAssignment(name, initializer), node);
@@ -58134,20 +72667,31 @@ var ts;
             }
             return node;
         }
+        /**
+         * Substitution for an Expression that may contain an imported or exported symbol.
+         *
+         * @param node The node to substitute.
+         */
         function substituteExpression(node) {
             switch (node.kind) {
-                case 71:
+                case 71 /* Identifier */:
                     return substituteExpressionIdentifier(node);
-                case 200:
+                case 200 /* BinaryExpression */:
                     return substituteBinaryExpression(node);
-                case 199:
-                case 198:
+                case 199 /* PostfixUnaryExpression */:
+                case 198 /* PrefixUnaryExpression */:
                     return substituteUnaryExpression(node);
             }
             return node;
         }
+        /**
+         * Substitution for an Identifier expression that may contain an imported or exported
+         * symbol.
+         *
+         * @param node The node to substitute.
+         */
         function substituteExpressionIdentifier(node) {
-            if (ts.getEmitFlags(node) & 4096) {
+            if (ts.getEmitFlags(node) & 4096 /* HelperName */) {
                 var externalHelpersModuleName = ts.getExternalHelpersModuleName(currentSourceFile);
                 if (externalHelpersModuleName) {
                     return ts.createPropertyAccess(externalHelpersModuleName, node);
@@ -58156,23 +72700,39 @@ var ts;
             }
             if (!ts.isGeneratedIdentifier(node) && !ts.isLocalName(node)) {
                 var exportContainer = resolver.getReferencedExportContainer(node, ts.isExportName(node));
-                if (exportContainer && exportContainer.kind === 274) {
-                    return ts.setTextRange(ts.createPropertyAccess(ts.createIdentifier("exports"), ts.getSynthesizedClone(node)), node);
+                if (exportContainer && exportContainer.kind === 274 /* SourceFile */) {
+                    return ts.setTextRange(ts.createPropertyAccess(ts.createIdentifier("exports"), ts.getSynthesizedClone(node)), 
+                    /*location*/ node);
                 }
                 var importDeclaration = resolver.getReferencedImportDeclaration(node);
                 if (importDeclaration) {
                     if (ts.isImportClause(importDeclaration)) {
-                        return ts.setTextRange(ts.createPropertyAccess(ts.getGeneratedNameForNode(importDeclaration.parent), ts.createIdentifier("default")), node);
+                        return ts.setTextRange(ts.createPropertyAccess(ts.getGeneratedNameForNode(importDeclaration.parent), ts.createIdentifier("default")), 
+                        /*location*/ node);
                     }
                     else if (ts.isImportSpecifier(importDeclaration)) {
                         var name = importDeclaration.propertyName || importDeclaration.name;
-                        return ts.setTextRange(ts.createPropertyAccess(ts.getGeneratedNameForNode(importDeclaration.parent.parent.parent), ts.getSynthesizedClone(name)), node);
+                        return ts.setTextRange(ts.createPropertyAccess(ts.getGeneratedNameForNode(importDeclaration.parent.parent.parent), ts.getSynthesizedClone(name)), 
+                        /*location*/ node);
                     }
                 }
             }
             return node;
         }
+        /**
+         * Substitution for a BinaryExpression that may contain an imported or exported symbol.
+         *
+         * @param node The node to substitute.
+         */
         function substituteBinaryExpression(node) {
+            // When we see an assignment expression whose left-hand side is an exported symbol,
+            // we should ensure all exports of that symbol are updated with the correct value.
+            //
+            // - We do not substitute generated identifiers for any reason.
+            // - We do not substitute identifiers tagged with the LocalName flag.
+            // - We do not substitute identifiers that were originally the name of an enum or
+            //   namespace due to how they are transformed in TypeScript.
+            // - We only substitute identifiers that are exported at the top level.
             if (ts.isAssignmentOperator(node.operatorToken.kind)
                 && ts.isIdentifier(node.left)
                 && !ts.isGeneratedIdentifier(node.left)
@@ -58180,30 +72740,48 @@ var ts;
                 && !ts.isDeclarationNameOfEnumOrNamespace(node.left)) {
                 var exportedNames = getExports(node.left);
                 if (exportedNames) {
+                    // For each additional export of the declaration, apply an export assignment.
                     var expression = node;
                     for (var _i = 0, exportedNames_2 = exportedNames; _i < exportedNames_2.length; _i++) {
                         var exportName = exportedNames_2[_i];
+                        // Mark the node to prevent triggering this rule again.
                         noSubstitution[ts.getNodeId(expression)] = true;
-                        expression = createExportExpression(exportName, expression, node);
+                        expression = createExportExpression(exportName, expression, /*location*/ node);
                     }
                     return expression;
                 }
             }
             return node;
         }
+        /**
+         * Substitution for a UnaryExpression that may contain an imported or exported symbol.
+         *
+         * @param node The node to substitute.
+         */
         function substituteUnaryExpression(node) {
-            if ((node.operator === 43 || node.operator === 44)
+            // When we see a prefix or postfix increment expression whose operand is an exported
+            // symbol, we should ensure all exports of that symbol are updated with the correct
+            // value.
+            //
+            // - We do not substitute generated identifiers for any reason.
+            // - We do not substitute identifiers tagged with the LocalName flag.
+            // - We do not substitute identifiers that were originally the name of an enum or
+            //   namespace due to how they are transformed in TypeScript.
+            // - We only substitute identifiers that are exported at the top level.
+            if ((node.operator === 43 /* PlusPlusToken */ || node.operator === 44 /* MinusMinusToken */)
                 && ts.isIdentifier(node.operand)
                 && !ts.isGeneratedIdentifier(node.operand)
                 && !ts.isLocalName(node.operand)
                 && !ts.isDeclarationNameOfEnumOrNamespace(node.operand)) {
                 var exportedNames = getExports(node.operand);
                 if (exportedNames) {
-                    var expression = node.kind === 199
-                        ? ts.setTextRange(ts.createBinary(node.operand, ts.createToken(node.operator === 43 ? 59 : 60), ts.createLiteral(1)), node)
+                    var expression = node.kind === 199 /* PostfixUnaryExpression */
+                        ? ts.setTextRange(ts.createBinary(node.operand, ts.createToken(node.operator === 43 /* PlusPlusToken */ ? 59 /* PlusEqualsToken */ : 60 /* MinusEqualsToken */), ts.createLiteral(1)), 
+                        /*location*/ node)
                         : node;
                     for (var _i = 0, exportedNames_3 = exportedNames; _i < exportedNames_3.length; _i++) {
                         var exportName = exportedNames_3[_i];
+                        // Mark the node to prevent triggering this rule again.
                         noSubstitution[ts.getNodeId(expression)] = true;
                         expression = createExportExpression(exportName, expression);
                     }
@@ -58212,6 +72790,11 @@ var ts;
             }
             return node;
         }
+        /**
+         * Gets the additional exports of a name.
+         *
+         * @param name The name.
+         */
         function getExports(name) {
             if (!ts.isGeneratedIdentifier(name)) {
                 var valueDeclaration = resolver.getReferencedImportDeclaration(name)
@@ -58224,6 +72807,7 @@ var ts;
         }
     }
     ts.transformModule = transformModule;
+    // emit output for the __export helper function
     var exportStarHelper = {
         name: "typescript:export-star",
         scoped: true,
@@ -58232,25 +72816,29 @@ var ts;
     function createExportStarHelper(context, module) {
         var compilerOptions = context.getCompilerOptions();
         return compilerOptions.importHelpers
-            ? ts.createCall(ts.getHelperName("__exportStar"), undefined, [module, ts.createIdentifier("exports")])
-            : ts.createCall(ts.createIdentifier("__export"), undefined, [module]);
+            ? ts.createCall(ts.getHelperName("__exportStar"), /*typeArguments*/ undefined, [module, ts.createIdentifier("exports")])
+            : ts.createCall(ts.createIdentifier("__export"), /*typeArguments*/ undefined, [module]);
     }
+    // emit helper for dynamic import
     var dynamicImportUMDHelper = {
         name: "typescript:dynamicimport-sync-require",
         scoped: true,
         text: "\n            var __syncRequire = typeof module === \"object\" && typeof module.exports === \"object\";"
     };
+    // emit helper for `import * as Name from "foo"`
     var importStarHelper = {
         name: "typescript:commonjsimportstar",
         scoped: false,
         text: "\nvar __importStar = (this && this.__importStar) || function (mod) {\n    if (mod && mod.__esModule) return mod;\n    var result = {};\n    if (mod != null) for (var k in mod) if (Object.hasOwnProperty.call(mod, k)) result[k] = mod[k];\n    result[\"default\"] = mod;\n    return result;\n};"
     };
+    // emit helper for `import Name from "foo"`
     var importDefaultHelper = {
         name: "typescript:commonjsimportdefault",
         scoped: false,
         text: "\nvar __importDefault = (this && this.__importDefault) || function (mod) {\n    return (mod && mod.__esModule) ? mod : { \"default\": mod };\n};"
     };
 })(ts || (ts = {}));
+/*@internal*/
 var ts;
 (function (ts) {
     function transformSystemModule(context) {
@@ -58262,48 +72850,78 @@ var ts;
         var previousOnEmitNode = context.onEmitNode;
         context.onSubstituteNode = onSubstituteNode;
         context.onEmitNode = onEmitNode;
-        context.enableSubstitution(71);
-        context.enableSubstitution(271);
-        context.enableSubstitution(200);
-        context.enableSubstitution(198);
-        context.enableSubstitution(199);
-        context.enableEmitNotification(274);
-        var moduleInfoMap = [];
-        var deferredExports = [];
-        var exportFunctionsMap = [];
-        var noSubstitutionMap = [];
-        var currentSourceFile;
-        var moduleInfo;
-        var exportFunction;
-        var contextObject;
+        context.enableSubstitution(71 /* Identifier */); // Substitutes expression identifiers for imported symbols.
+        context.enableSubstitution(271 /* ShorthandPropertyAssignment */); // Substitutes expression identifiers for imported symbols
+        context.enableSubstitution(200 /* BinaryExpression */); // Substitutes assignments to exported symbols.
+        context.enableSubstitution(198 /* PrefixUnaryExpression */); // Substitutes updates to exported symbols.
+        context.enableSubstitution(199 /* PostfixUnaryExpression */); // Substitutes updates to exported symbols.
+        context.enableEmitNotification(274 /* SourceFile */); // Restore state when substituting nodes in a file.
+        var moduleInfoMap = []; // The ExternalModuleInfo for each file.
+        var deferredExports = []; // Exports to defer until an EndOfDeclarationMarker is found.
+        var exportFunctionsMap = []; // The export function associated with a source file.
+        var noSubstitutionMap = []; // Set of nodes for which substitution rules should be ignored for each file.
+        var currentSourceFile; // The current file.
+        var moduleInfo; // ExternalModuleInfo for the current file.
+        var exportFunction; // The export function for the current file.
+        var contextObject; // The context object for the current file.
         var hoistedStatements;
         var enclosingBlockScopedContainer;
-        var noSubstitution;
+        var noSubstitution; // Set of nodes for which substitution rules should be ignored.
         return ts.chainBundle(transformSourceFile);
+        /**
+         * Transforms the module aspects of a SourceFile.
+         *
+         * @param node The SourceFile node.
+         */
         function transformSourceFile(node) {
-            if (node.isDeclarationFile || !(ts.isEffectiveExternalModule(node, compilerOptions) || node.transformFlags & 67108864)) {
+            if (node.isDeclarationFile || !(ts.isEffectiveExternalModule(node, compilerOptions) || node.transformFlags & 67108864 /* ContainsDynamicImport */)) {
                 return node;
             }
             var id = ts.getOriginalNodeId(node);
             currentSourceFile = node;
             enclosingBlockScopedContainer = node;
+            // System modules have the following shape:
+            //
+            //     System.register(['dep-1', ... 'dep-n'], function(exports) {/* module body function */})
+            //
+            // The parameter 'exports' here is a callback '<T>(name: string, value: T) => T' that
+            // is used to publish exported values. 'exports' returns its 'value' argument so in
+            // most cases expressions that mutate exported values can be rewritten as:
+            //
+            //     expr -> exports('name', expr)
+            //
+            // The only exception in this rule is postfix unary operators,
+            // see comment to 'substitutePostfixUnaryExpression' for more details
+            // Collect information about the external module and dependency groups.
             moduleInfo = moduleInfoMap[id] = ts.collectExternalModuleInfo(node, resolver, compilerOptions);
+            // Make sure that the name of the 'exports' function does not conflict with
+            // existing identifiers.
             exportFunction = ts.createUniqueName("exports");
             exportFunctionsMap[id] = exportFunction;
             contextObject = ts.createUniqueName("context");
+            // Add the body of the module.
             var dependencyGroups = collectDependencyGroups(moduleInfo.externalImports);
             var moduleBodyBlock = createSystemModuleBody(node, dependencyGroups);
-            var moduleBodyFunction = ts.createFunctionExpression(undefined, undefined, undefined, undefined, [
-                ts.createParameter(undefined, undefined, undefined, exportFunction),
-                ts.createParameter(undefined, undefined, undefined, contextObject)
-            ], undefined, moduleBodyBlock);
+            var moduleBodyFunction = ts.createFunctionExpression(
+            /*modifiers*/ undefined, 
+            /*asteriskToken*/ undefined, 
+            /*name*/ undefined, 
+            /*typeParameters*/ undefined, [
+                ts.createParameter(/*decorators*/ undefined, /*modifiers*/ undefined, /*dotDotDotToken*/ undefined, exportFunction),
+                ts.createParameter(/*decorators*/ undefined, /*modifiers*/ undefined, /*dotDotDotToken*/ undefined, contextObject)
+            ], 
+            /*type*/ undefined, moduleBodyBlock);
+            // Write the call to `System.register`
+            // Clear the emit-helpers flag for later passes since we'll have already used it in the module body
+            // So the helper will be emit at the correct position instead of at the top of the source-file
             var moduleName = ts.tryGetModuleNameFromFile(node, host, compilerOptions);
             var dependencies = ts.createArrayLiteral(ts.map(dependencyGroups, function (dependencyGroup) { return dependencyGroup.name; }));
             var updated = ts.setEmitFlags(ts.updateSourceFileNode(node, ts.setTextRange(ts.createNodeArray([
-                ts.createStatement(ts.createCall(ts.createPropertyAccess(ts.createIdentifier("System"), "register"), undefined, moduleName
+                ts.createStatement(ts.createCall(ts.createPropertyAccess(ts.createIdentifier("System"), "register"), 
+                /*typeArguments*/ undefined, moduleName
                     ? [moduleName, dependencies, moduleBodyFunction]
                     : [dependencies, moduleBodyFunction]))
-            ]), node.statements)), 1024);
+            ]), node.statements)), 1024 /* NoTrailingComments */);
             if (!(compilerOptions.outFile || compilerOptions.out)) {
                 ts.moveEmitHelpers(updated, moduleBodyBlock, function (helper) { return !helper.scoped; });
             }
@@ -58319,6 +72937,11 @@ var ts;
             enclosingBlockScopedContainer = undefined;
             return ts.aggregateTransformFlags(updated);
         }
+        /**
+         * Collects the dependency groups for this files imports.
+         *
+         * @param externalImports The imports for the file.
+         */
         function collectDependencyGroups(externalImports) {
             var groupIndices = ts.createMap();
             var dependencyGroups = [];
@@ -58329,6 +72952,7 @@ var ts;
                     var text = externalModuleName.text;
                     var groupIndex = groupIndices.get(text);
                     if (groupIndex !== undefined) {
+                        // deduplicate/group entries in dependency list by the dependency name
                         dependencyGroups[groupIndex].externalImports.push(externalImport);
                     }
                     else {
@@ -58342,42 +72966,124 @@ var ts;
             }
             return dependencyGroups;
         }
+        /**
+         * Adds the statements for the module body function for the source file.
+         *
+         * @param node The source file for the module.
+         * @param dependencyGroups The grouped dependencies of the module.
+         */
         function createSystemModuleBody(node, dependencyGroups) {
+            // Shape of the body in system modules:
+            //
+            //  function (exports) {
+            //      <list of local aliases for imports>
+            //      <hoisted variable declarations>
+            //      <hoisted function declarations>
+            //      return {
+            //          setters: [
+            //              <list of setter function for imports>
+            //          ],
+            //          execute: function() {
+            //              <module statements>
+            //          }
+            //      }
+            //      <temp declarations>
+            //  }
+            //
+            // i.e:
+            //
+            //   import {x} from 'file1'
+            //   var y = 1;
+            //   export function foo() { return y + x(); }
+            //   console.log(y);
+            //
+            // Will be transformed to:
+            //
+            //  function(exports) {
+            //      function foo() { return y + file_1.x(); }
+            //      exports("foo", foo);
+            //      var file_1, y;
+            //      return {
+            //          setters: [
+            //              function(v) { file_1 = v }
+            //          ],
+            //          execute(): function() {
+            //              y = 1;
+            //              console.log(y);
+            //          }
+            //      };
+            //  }
             var statements = [];
+            // We start a new lexical environment in this function body, but *not* in the
+            // body of the execute function. This allows us to emit temporary declarations
+            // only in the outer module body and not in the inner one.
             startLexicalEnvironment();
+            // Add any prologue directives.
             var ensureUseStrict = ts.getStrictOptionValue(compilerOptions, "alwaysStrict") || (!compilerOptions.noImplicitUseStrict && ts.isExternalModule(currentSourceFile));
             var statementOffset = ts.addPrologue(statements, node.statements, ensureUseStrict, sourceElementVisitor);
-            statements.push(ts.createVariableStatement(undefined, ts.createVariableDeclarationList([
-                ts.createVariableDeclaration("__moduleName", undefined, ts.createLogicalAnd(contextObject, ts.createPropertyAccess(contextObject, "id")))
+            // var __moduleName = context_1 && context_1.id;
+            statements.push(ts.createVariableStatement(
+            /*modifiers*/ undefined, ts.createVariableDeclarationList([
+                ts.createVariableDeclaration("__moduleName", 
+                /*type*/ undefined, ts.createLogicalAnd(contextObject, ts.createPropertyAccess(contextObject, "id")))
             ])));
+            // Visit the synthetic external helpers import declaration if present
             ts.visitNode(moduleInfo.externalHelpersImportDeclaration, sourceElementVisitor, ts.isStatement);
+            // Visit the statements of the source file, emitting any transformations into
+            // the `executeStatements` array. We do this *before* we fill the `setters` array
+            // as we both emit transformations as well as aggregate some data used when creating
+            // setters. This allows us to reduce the number of times we need to loop through the
+            // statements of the source file.
             var executeStatements = ts.visitNodes(node.statements, sourceElementVisitor, ts.isStatement, statementOffset);
+            // Emit early exports for function declarations.
             ts.addRange(statements, hoistedStatements);
+            // We emit hoisted variables early to align roughly with our previous emit output.
+            // Two key differences in this approach are:
+            // - Temporary variables will appear at the top rather than at the bottom of the file
             ts.prependStatements(statements, endLexicalEnvironment());
-            var exportStarFunction = addExportStarIfNeeded(statements);
+            var exportStarFunction = addExportStarIfNeeded(statements); // TODO: GH#18217
             var moduleObject = ts.createObjectLiteral([
                 ts.createPropertyAssignment("setters", createSettersArray(exportStarFunction, dependencyGroups)),
-                ts.createPropertyAssignment("execute", ts.createFunctionExpression(undefined, undefined, undefined, undefined, [], undefined, ts.createBlock(executeStatements, true)))
+                ts.createPropertyAssignment("execute", ts.createFunctionExpression(
+                /*modifiers*/ undefined, 
+                /*asteriskToken*/ undefined, 
+                /*name*/ undefined, 
+                /*typeParameters*/ undefined, 
+                /*parameters*/ [], 
+                /*type*/ undefined, ts.createBlock(executeStatements, /*multiLine*/ true)))
             ]);
             moduleObject.multiLine = true;
             statements.push(ts.createReturn(moduleObject));
-            return ts.createBlock(statements, true);
+            return ts.createBlock(statements, /*multiLine*/ true);
         }
+        /**
+         * Adds an exportStar function to a statement list if it is needed for the file.
+         *
+         * @param statements A statement list.
+         */
         function addExportStarIfNeeded(statements) {
             if (!moduleInfo.hasExportStarsToExportValues) {
                 return;
             }
+            // when resolving exports local exported entries/indirect exported entries in the module
+            // should always win over entries with similar names that were added via star exports
+            // to support this we store names of local/indirect exported entries in a set.
+            // this set is used to filter names brought by star expors.
+            // local names set should only be added if we have anything exported
             if (!moduleInfo.exportedNames && moduleInfo.exportSpecifiers.size === 0) {
+                // no exported declarations (export var ...) or export specifiers (export {x})
+                // check if we have any non star export declarations.
                 var hasExportDeclarationWithExportClause = false;
                 for (var _i = 0, _a = moduleInfo.externalImports; _i < _a.length; _i++) {
                     var externalImport = _a[_i];
-                    if (externalImport.kind === 250 && externalImport.exportClause) {
+                    if (externalImport.kind === 250 /* ExportDeclaration */ && externalImport.exportClause) {
                         hasExportDeclarationWithExportClause = true;
                         break;
                     }
                 }
                 if (!hasExportDeclarationWithExportClause) {
-                    var exportStarFunction_1 = createExportStarFunction(undefined);
+                    // we still need to emit exportStar helper
+                    var exportStarFunction_1 = createExportStarFunction(/*localNames*/ undefined);
                     statements.push(exportStarFunction_1);
                     return exportStarFunction_1.name;
                 }
@@ -58389,30 +73095,42 @@ var ts;
                     if (exportedLocalName.escapedText === "default") {
                         continue;
                     }
+                    // write name of exported declaration, i.e 'export var x...'
                     exportedNames.push(ts.createPropertyAssignment(ts.createLiteral(exportedLocalName), ts.createTrue()));
                 }
             }
             for (var _d = 0, _e = moduleInfo.externalImports; _d < _e.length; _d++) {
                 var externalImport = _e[_d];
-                if (externalImport.kind !== 250) {
+                if (externalImport.kind !== 250 /* ExportDeclaration */) {
                     continue;
                 }
                 if (!externalImport.exportClause) {
+                    // export * from ...
                     continue;
                 }
                 for (var _f = 0, _g = externalImport.exportClause.elements; _f < _g.length; _f++) {
                     var element = _g[_f];
+                    // write name of indirectly exported entry, i.e. 'export {x} from ...'
                     exportedNames.push(ts.createPropertyAssignment(ts.createLiteral(ts.idText(element.name || element.propertyName)), ts.createTrue()));
                 }
             }
             var exportedNamesStorageRef = ts.createUniqueName("exportedNames");
-            statements.push(ts.createVariableStatement(undefined, ts.createVariableDeclarationList([
-                ts.createVariableDeclaration(exportedNamesStorageRef, undefined, ts.createObjectLiteral(exportedNames, true))
+            statements.push(ts.createVariableStatement(
+            /*modifiers*/ undefined, ts.createVariableDeclarationList([
+                ts.createVariableDeclaration(exportedNamesStorageRef, 
+                /*type*/ undefined, ts.createObjectLiteral(exportedNames, /*multiline*/ true))
             ])));
             var exportStarFunction = createExportStarFunction(exportedNamesStorageRef);
             statements.push(exportStarFunction);
             return exportStarFunction.name;
         }
+        /**
+         * Creates an exportStar function for the file, with an optional set of excluded local
+         * names.
+         *
+         * @param localNames An optional reference to an object containing a set of excluded local
+         * names.
+         */
         function createExportStarFunction(localNames) {
             var exportStarFunction = ts.createUniqueName("exportStar");
             var m = ts.createIdentifier("m");
@@ -58420,79 +73138,135 @@ var ts;
             var exports = ts.createIdentifier("exports");
             var condition = ts.createStrictInequality(n, ts.createLiteral("default"));
             if (localNames) {
-                condition = ts.createLogicalAnd(condition, ts.createLogicalNot(ts.createCall(ts.createPropertyAccess(localNames, "hasOwnProperty"), undefined, [n])));
+                condition = ts.createLogicalAnd(condition, ts.createLogicalNot(ts.createCall(ts.createPropertyAccess(localNames, "hasOwnProperty"), 
+                /*typeArguments*/ undefined, [n])));
             }
-            return ts.createFunctionDeclaration(undefined, undefined, undefined, exportStarFunction, undefined, [ts.createParameter(undefined, undefined, undefined, m)], undefined, ts.createBlock([
-                ts.createVariableStatement(undefined, ts.createVariableDeclarationList([
-                    ts.createVariableDeclaration(exports, undefined, ts.createObjectLiteral([]))
+            return ts.createFunctionDeclaration(
+            /*decorators*/ undefined, 
+            /*modifiers*/ undefined, 
+            /*asteriskToken*/ undefined, exportStarFunction, 
+            /*typeParameters*/ undefined, [ts.createParameter(/*decorators*/ undefined, /*modifiers*/ undefined, /*dotDotDotToken*/ undefined, m)], 
+            /*type*/ undefined, ts.createBlock([
+                ts.createVariableStatement(
+                /*modifiers*/ undefined, ts.createVariableDeclarationList([
+                    ts.createVariableDeclaration(exports, 
+                    /*type*/ undefined, ts.createObjectLiteral([]))
                 ])),
                 ts.createForIn(ts.createVariableDeclarationList([
-                    ts.createVariableDeclaration(n, undefined)
+                    ts.createVariableDeclaration(n, /*type*/ undefined)
                 ]), m, ts.createBlock([
-                    ts.setEmitFlags(ts.createIf(condition, ts.createStatement(ts.createAssignment(ts.createElementAccess(exports, n), ts.createElementAccess(m, n)))), 1)
+                    ts.setEmitFlags(ts.createIf(condition, ts.createStatement(ts.createAssignment(ts.createElementAccess(exports, n), ts.createElementAccess(m, n)))), 1 /* SingleLine */)
                 ])),
-                ts.createStatement(ts.createCall(exportFunction, undefined, [exports]))
-            ], true));
+                ts.createStatement(ts.createCall(exportFunction, 
+                /*typeArguments*/ undefined, [exports]))
+            ], /*multiline*/ true));
         }
+        /**
+         * Creates an array setter callbacks for each dependency group.
+         *
+         * @param exportStarFunction A reference to an exportStarFunction for the file.
+         * @param dependencyGroups An array of grouped dependencies.
+         */
         function createSettersArray(exportStarFunction, dependencyGroups) {
             var setters = [];
             for (var _i = 0, dependencyGroups_1 = dependencyGroups; _i < dependencyGroups_1.length; _i++) {
                 var group_1 = dependencyGroups_1[_i];
+                // derive a unique name for parameter from the first named entry in the group
                 var localName = ts.forEach(group_1.externalImports, function (i) { return ts.getLocalNameForExternalImport(i, currentSourceFile); });
                 var parameterName = localName ? ts.getGeneratedNameForNode(localName) : ts.createUniqueName("");
                 var statements = [];
                 for (var _a = 0, _b = group_1.externalImports; _a < _b.length; _a++) {
                     var entry = _b[_a];
-                    var importVariableName = ts.getLocalNameForExternalImport(entry, currentSourceFile);
+                    var importVariableName = ts.getLocalNameForExternalImport(entry, currentSourceFile); // TODO: GH#18217
                     switch (entry.kind) {
-                        case 244:
+                        case 244 /* ImportDeclaration */:
                             if (!entry.importClause) {
+                                // 'import "..."' case
+                                // module is imported only for side-effects, no emit required
                                 break;
                             }
-                        case 243:
+                        // falls through
+                        case 243 /* ImportEqualsDeclaration */:
                             ts.Debug.assert(importVariableName !== undefined);
+                            // save import into the local
                             statements.push(ts.createStatement(ts.createAssignment(importVariableName, parameterName)));
                             break;
-                        case 250:
+                        case 250 /* ExportDeclaration */:
                             ts.Debug.assert(importVariableName !== undefined);
                             if (entry.exportClause) {
+                                //  export {a, b as c} from 'foo'
+                                //
+                                // emit as:
+                                //
+                                //  exports_({
+                                //     "a": _["a"],
+                                //     "c": _["b"]
+                                //  });
                                 var properties = [];
                                 for (var _c = 0, _d = entry.exportClause.elements; _c < _d.length; _c++) {
                                     var e = _d[_c];
                                     properties.push(ts.createPropertyAssignment(ts.createLiteral(ts.idText(e.name)), ts.createElementAccess(parameterName, ts.createLiteral(ts.idText(e.propertyName || e.name)))));
                                 }
-                                statements.push(ts.createStatement(ts.createCall(exportFunction, undefined, [ts.createObjectLiteral(properties, true)])));
+                                statements.push(ts.createStatement(ts.createCall(exportFunction, 
+                                /*typeArguments*/ undefined, [ts.createObjectLiteral(properties, /*multiline*/ true)])));
                             }
                             else {
-                                statements.push(ts.createStatement(ts.createCall(exportStarFunction, undefined, [parameterName])));
+                                //  export * from 'foo'
+                                //
+                                // emit as:
+                                //
+                                //  exportStar(foo_1_1);
+                                statements.push(ts.createStatement(ts.createCall(exportStarFunction, 
+                                /*typeArguments*/ undefined, [parameterName])));
                             }
                             break;
                     }
                 }
-                setters.push(ts.createFunctionExpression(undefined, undefined, undefined, undefined, [ts.createParameter(undefined, undefined, undefined, parameterName)], undefined, ts.createBlock(statements, true)));
+                setters.push(ts.createFunctionExpression(
+                /*modifiers*/ undefined, 
+                /*asteriskToken*/ undefined, 
+                /*name*/ undefined, 
+                /*typeParameters*/ undefined, [ts.createParameter(/*decorators*/ undefined, /*modifiers*/ undefined, /*dotDotDotToken*/ undefined, parameterName)], 
+                /*type*/ undefined, ts.createBlock(statements, /*multiLine*/ true)));
             }
-            return ts.createArrayLiteral(setters, true);
+            return ts.createArrayLiteral(setters, /*multiLine*/ true);
         }
+        //
+        // Top-level Source Element Visitors
+        //
+        /**
+         * Visit source elements at the top-level of a module.
+         *
+         * @param node The node to visit.
+         */
         function sourceElementVisitor(node) {
             switch (node.kind) {
-                case 244:
+                case 244 /* ImportDeclaration */:
                     return visitImportDeclaration(node);
-                case 243:
+                case 243 /* ImportEqualsDeclaration */:
                     return visitImportEqualsDeclaration(node);
-                case 250:
+                case 250 /* ExportDeclaration */:
+                    // ExportDeclarations are elided as they are handled via
+                    // `appendExportsOfDeclaration`.
                     return undefined;
-                case 249:
+                case 249 /* ExportAssignment */:
                     return visitExportAssignment(node);
                 default:
                     return nestedElementVisitor(node);
             }
         }
+        /**
+         * Visits an ImportDeclaration node.
+         *
+         * @param node The node to visit.
+         */
         function visitImportDeclaration(node) {
             var statements;
             if (node.importClause) {
-                hoistVariableDeclaration(ts.getLocalNameForExternalImport(node, currentSourceFile));
+                hoistVariableDeclaration(ts.getLocalNameForExternalImport(node, currentSourceFile)); // TODO: GH#18217
             }
             if (hasAssociatedEndOfDeclarationMarker(node)) {
+                // Defer exports until we encounter an EndOfDeclarationMarker node
                 var id = ts.getOriginalNodeId(node);
                 deferredExports[id] = appendExportsOfImportDeclaration(deferredExports[id], node);
             }
@@ -58501,11 +73275,17 @@ var ts;
             }
             return ts.singleOrMany(statements);
         }
+        /**
+         * Visits an ImportEqualsDeclaration node.
+         *
+         * @param node The node to visit.
+         */
         function visitImportEqualsDeclaration(node) {
             ts.Debug.assert(ts.isExternalModuleImportEqualsDeclaration(node), "import= for internal module references should be handled in an earlier transformer.");
             var statements;
-            hoistVariableDeclaration(ts.getLocalNameForExternalImport(node, currentSourceFile));
+            hoistVariableDeclaration(ts.getLocalNameForExternalImport(node, currentSourceFile)); // TODO: GH#18217
             if (hasAssociatedEndOfDeclarationMarker(node)) {
+                // Defer exports until we encounter an EndOfDeclarationMarker node
                 var id = ts.getOriginalNodeId(node);
                 deferredExports[id] = appendExportsOfImportEqualsDeclaration(deferredExports[id], node);
             }
@@ -58514,28 +73294,43 @@ var ts;
             }
             return ts.singleOrMany(statements);
         }
+        /**
+         * Visits an ExportAssignment node.
+         *
+         * @param node The node to visit.
+         */
         function visitExportAssignment(node) {
             if (node.isExportEquals) {
+                // Elide `export=` as it is illegal in a SystemJS module.
                 return undefined;
             }
             var expression = ts.visitNode(node.expression, destructuringAndImportCallVisitor, ts.isExpression);
             var original = node.original;
             if (original && hasAssociatedEndOfDeclarationMarker(original)) {
+                // Defer exports until we encounter an EndOfDeclarationMarker node
                 var id = ts.getOriginalNodeId(node);
-                deferredExports[id] = appendExportStatement(deferredExports[id], ts.createIdentifier("default"), expression, true);
+                deferredExports[id] = appendExportStatement(deferredExports[id], ts.createIdentifier("default"), expression, /*allowComments*/ true);
             }
             else {
-                return createExportStatement(ts.createIdentifier("default"), expression, true);
+                return createExportStatement(ts.createIdentifier("default"), expression, /*allowComments*/ true);
             }
         }
+        /**
+         * Visits a FunctionDeclaration, hoisting it to the outer module body function.
+         *
+         * @param node The node to visit.
+         */
         function visitFunctionDeclaration(node) {
-            if (ts.hasModifier(node, 1)) {
-                hoistedStatements = ts.append(hoistedStatements, ts.updateFunctionDeclaration(node, node.decorators, ts.visitNodes(node.modifiers, modifierVisitor, ts.isModifier), node.asteriskToken, ts.getDeclarationName(node, true, true), undefined, ts.visitNodes(node.parameters, destructuringAndImportCallVisitor, ts.isParameterDeclaration), undefined, ts.visitNode(node.body, destructuringAndImportCallVisitor, ts.isBlock)));
+            if (ts.hasModifier(node, 1 /* Export */)) {
+                hoistedStatements = ts.append(hoistedStatements, ts.updateFunctionDeclaration(node, node.decorators, ts.visitNodes(node.modifiers, modifierVisitor, ts.isModifier), node.asteriskToken, ts.getDeclarationName(node, /*allowComments*/ true, /*allowSourceMaps*/ true), 
+                /*typeParameters*/ undefined, ts.visitNodes(node.parameters, destructuringAndImportCallVisitor, ts.isParameterDeclaration), 
+                /*type*/ undefined, ts.visitNode(node.body, destructuringAndImportCallVisitor, ts.isBlock)));
             }
             else {
                 hoistedStatements = ts.append(hoistedStatements, ts.visitEachChild(node, destructuringAndImportCallVisitor, context));
             }
             if (hasAssociatedEndOfDeclarationMarker(node)) {
+                // Defer exports until we encounter an EndOfDeclarationMarker node
                 var id = ts.getOriginalNodeId(node);
                 deferredExports[id] = appendExportsOfHoistedDeclaration(deferredExports[id], node);
             }
@@ -58544,12 +73339,22 @@ var ts;
             }
             return undefined;
         }
+        /**
+         * Visits a ClassDeclaration, hoisting its name to the outer module body function.
+         *
+         * @param node The node to visit.
+         */
         function visitClassDeclaration(node) {
             var statements;
+            // Hoist the name of the class declaration to the outer module body function.
             var name = ts.getLocalName(node);
             hoistVariableDeclaration(name);
-            statements = ts.append(statements, ts.setTextRange(ts.createStatement(ts.createAssignment(name, ts.setTextRange(ts.createClassExpression(undefined, node.name, undefined, ts.visitNodes(node.heritageClauses, destructuringAndImportCallVisitor, ts.isHeritageClause), ts.visitNodes(node.members, destructuringAndImportCallVisitor, ts.isClassElement)), node))), node));
+            // Rewrite the class declaration into an assignment of a class expression.
+            statements = ts.append(statements, ts.setTextRange(ts.createStatement(ts.createAssignment(name, ts.setTextRange(ts.createClassExpression(
+            /*modifiers*/ undefined, node.name, 
+            /*typeParameters*/ undefined, ts.visitNodes(node.heritageClauses, destructuringAndImportCallVisitor, ts.isHeritageClause), ts.visitNodes(node.members, destructuringAndImportCallVisitor, ts.isClassElement)), node))), node));
             if (hasAssociatedEndOfDeclarationMarker(node)) {
+                // Defer exports until we encounter an EndOfDeclarationMarker node
                 var id = ts.getOriginalNodeId(node);
                 deferredExports[id] = appendExportsOfHoistedDeclaration(deferredExports[id], node);
             }
@@ -58558,12 +73363,18 @@ var ts;
             }
             return ts.singleOrMany(statements);
         }
+        /**
+         * Visits a variable statement, hoisting declared names to the top-level module body.
+         * Each declaration is rewritten into an assignment expression.
+         *
+         * @param node The node to visit.
+         */
         function visitVariableStatement(node) {
             if (!shouldHoistVariableDeclarationList(node.declarationList)) {
                 return ts.visitNode(node, destructuringAndImportCallVisitor, ts.isStatement);
             }
             var expressions;
-            var isExportedDeclaration = ts.hasModifier(node, 1);
+            var isExportedDeclaration = ts.hasModifier(node, 1 /* Export */);
             var isMarkedDeclaration = hasAssociatedEndOfDeclarationMarker(node);
             for (var _i = 0, _a = node.declarationList.declarations; _i < _a.length; _i++) {
                 var variable = _a[_i];
@@ -58579,14 +73390,20 @@ var ts;
                 statements = ts.append(statements, ts.setTextRange(ts.createStatement(ts.inlineExpressions(expressions)), node));
             }
             if (isMarkedDeclaration) {
+                // Defer exports until we encounter an EndOfDeclarationMarker node
                 var id = ts.getOriginalNodeId(node);
                 deferredExports[id] = appendExportsOfVariableStatement(deferredExports[id], node, isExportedDeclaration);
             }
             else {
-                statements = appendExportsOfVariableStatement(statements, node, false);
+                statements = appendExportsOfVariableStatement(statements, node, /*exportSelf*/ false);
             }
             return ts.singleOrMany(statements);
         }
+        /**
+         * Hoists the declared names of a VariableDeclaration or BindingElement.
+         *
+         * @param node The declaration to hoist.
+         */
         function hoistBindingElement(node) {
             if (ts.isBindingPattern(node.name)) {
                 for (var _i = 0, _a = node.name.elements; _i < _a.length; _i++) {
@@ -58600,41 +73417,103 @@ var ts;
                 hoistVariableDeclaration(ts.getSynthesizedClone(node.name));
             }
         }
+        /**
+         * Determines whether a VariableDeclarationList should be hoisted.
+         *
+         * @param node The node to test.
+         */
         function shouldHoistVariableDeclarationList(node) {
-            return (ts.getEmitFlags(node) & 2097152) === 0
-                && (enclosingBlockScopedContainer.kind === 274
-                    || (ts.getOriginalNode(node).flags & 3) === 0);
+            // hoist only non-block scoped declarations or block scoped declarations parented by source file
+            return (ts.getEmitFlags(node) & 2097152 /* NoHoisting */) === 0
+                && (enclosingBlockScopedContainer.kind === 274 /* SourceFile */
+                    || (ts.getOriginalNode(node).flags & 3 /* BlockScoped */) === 0);
         }
+        /**
+         * Transform an initialized variable declaration into an expression.
+         *
+         * @param node The node to transform.
+         * @param isExportedDeclaration A value indicating whether the variable is exported.
+         */
         function transformInitializedVariable(node, isExportedDeclaration) {
             var createAssignment = isExportedDeclaration ? createExportedVariableAssignment : createNonExportedVariableAssignment;
             return ts.isBindingPattern(node.name)
-                ? ts.flattenDestructuringAssignment(node, destructuringAndImportCallVisitor, context, 0, false, createAssignment)
+                ? ts.flattenDestructuringAssignment(node, destructuringAndImportCallVisitor, context, 0 /* All */, 
+                /*needsValue*/ false, createAssignment)
                 : node.initializer ? createAssignment(node.name, ts.visitNode(node.initializer, destructuringAndImportCallVisitor, ts.isExpression)) : node.name;
         }
+        /**
+         * Creates an assignment expression for an exported variable declaration.
+         *
+         * @param name The name of the variable.
+         * @param value The value of the variable's initializer.
+         * @param location The source map location for the assignment.
+         */
         function createExportedVariableAssignment(name, value, location) {
-            return createVariableAssignment(name, value, location, true);
+            return createVariableAssignment(name, value, location, /*isExportedDeclaration*/ true);
         }
+        /**
+         * Creates an assignment expression for a non-exported variable declaration.
+         *
+         * @param name The name of the variable.
+         * @param value The value of the variable's initializer.
+         * @param location The source map location for the assignment.
+         */
         function createNonExportedVariableAssignment(name, value, location) {
-            return createVariableAssignment(name, value, location, false);
+            return createVariableAssignment(name, value, location, /*isExportedDeclaration*/ false);
         }
+        /**
+         * Creates an assignment expression for a variable declaration.
+         *
+         * @param name The name of the variable.
+         * @param value The value of the variable's initializer.
+         * @param location The source map location for the assignment.
+         * @param isExportedDeclaration A value indicating whether the variable is exported.
+         */
         function createVariableAssignment(name, value, location, isExportedDeclaration) {
             hoistVariableDeclaration(ts.getSynthesizedClone(name));
             return isExportedDeclaration
                 ? createExportExpression(name, preventSubstitution(ts.setTextRange(ts.createAssignment(name, value), location)))
                 : preventSubstitution(ts.setTextRange(ts.createAssignment(name, value), location));
         }
+        /**
+         * Visits a MergeDeclarationMarker used as a placeholder for the beginning of a merged
+         * and transformed declaration.
+         *
+         * @param node The node to visit.
+         */
         function visitMergeDeclarationMarker(node) {
-            if (hasAssociatedEndOfDeclarationMarker(node) && node.original.kind === 214) {
+            // For an EnumDeclaration or ModuleDeclaration that merges with a preceeding
+            // declaration we do not emit a leading variable declaration. To preserve the
+            // begin/end semantics of the declararation and to properly handle exports
+            // we wrapped the leading variable declaration in a `MergeDeclarationMarker`.
+            //
+            // To balance the declaration, we defer the exports of the elided variable
+            // statement until we visit this declaration's `EndOfDeclarationMarker`.
+            if (hasAssociatedEndOfDeclarationMarker(node) && node.original.kind === 214 /* VariableStatement */) {
                 var id = ts.getOriginalNodeId(node);
-                var isExportedDeclaration = ts.hasModifier(node.original, 1);
+                var isExportedDeclaration = ts.hasModifier(node.original, 1 /* Export */);
                 deferredExports[id] = appendExportsOfVariableStatement(deferredExports[id], node.original, isExportedDeclaration);
             }
             return node;
         }
+        /**
+         * Determines whether a node has an associated EndOfDeclarationMarker.
+         *
+         * @param node The node to test.
+         */
         function hasAssociatedEndOfDeclarationMarker(node) {
-            return (ts.getEmitFlags(node) & 4194304) !== 0;
+            return (ts.getEmitFlags(node) & 4194304 /* HasEndOfDeclarationMarker */) !== 0;
         }
+        /**
+         * Visits a DeclarationMarker used as a placeholder for the end of a transformed
+         * declaration.
+         *
+         * @param node The node to visit.
+         */
         function visitEndOfDeclarationMarker(node) {
+            // For some transformations we emit an `EndOfDeclarationMarker` to mark the actual
+            // end of the transformed declaration. We use this marker to emit any deferred exports
+            // of the declaration.
             var id = ts.getOriginalNodeId(node);
             var statements = deferredExports[id];
             if (statements) {
@@ -58649,6 +73528,15 @@ var ts;
             }
             return node;
         }
+        /**
+         * Appends the exports of an ImportDeclaration to a statement list, returning the
+         * statement list.
+         *
+         * @param statements A statement list to which the down-level export statements are to be
+         * appended. If `statements` is `undefined`, a new array is allocated if statements are
+         * appended.
+         * @param decl The declaration whose exports are to be recorded.
+         */
         function appendExportsOfImportDeclaration(statements, decl) {
             if (moduleInfo.exportEquals) {
                 return statements;
@@ -58663,10 +73551,10 @@ var ts;
             var namedBindings = importClause.namedBindings;
             if (namedBindings) {
                 switch (namedBindings.kind) {
-                    case 246:
+                    case 246 /* NamespaceImport */:
                         statements = appendExportsOfDeclaration(statements, namedBindings);
                         break;
-                    case 247:
+                    case 247 /* NamedImports */:
                         for (var _i = 0, _a = namedBindings.elements; _i < _a.length; _i++) {
                             var importBinding = _a[_i];
                             statements = appendExportsOfDeclaration(statements, importBinding);
@@ -58676,12 +73564,32 @@ var ts;
             }
             return statements;
         }
+        /**
+         * Appends the export of an ImportEqualsDeclaration to a statement list, returning the
+         * statement list.
+         *
+         * @param statements A statement list to which the down-level export statements are to be
+         * appended. If `statements` is `undefined`, a new array is allocated if statements are
+         * appended.
+         * @param decl The declaration whose exports are to be recorded.
+         */
         function appendExportsOfImportEqualsDeclaration(statements, decl) {
             if (moduleInfo.exportEquals) {
                 return statements;
             }
             return appendExportsOfDeclaration(statements, decl);
         }
+        /**
+         * Appends the exports of a VariableStatement to a statement list, returning the statement
+         * list.
+         *
+         * @param statements A statement list to which the down-level export statements are to be
+         * appended. If `statements` is `undefined`, a new array is allocated if statements are
+         * appended.
+         * @param node The VariableStatement whose exports are to be recorded.
+         * @param exportSelf A value indicating whether to also export each VariableDeclaration of
+         * `nodes` declaration list.
+         */
         function appendExportsOfVariableStatement(statements, node, exportSelf) {
             if (moduleInfo.exportEquals) {
                 return statements;
@@ -58694,6 +73602,16 @@ var ts;
             }
             return statements;
         }
+        /**
+         * Appends the exports of a VariableDeclaration or BindingElement to a statement list,
+         * returning the statement list.
+         *
+         * @param statements A statement list to which the down-level export statements are to be
+         * appended. If `statements` is `undefined`, a new array is allocated if statements are
+         * appended.
+         * @param decl The declaration whose exports are to be recorded.
+         * @param exportSelf A value indicating whether to also export the declaration itself.
+         */
         function appendExportsOfBindingElement(statements, decl, exportSelf) {
             if (moduleInfo.exportEquals) {
                 return statements;
@@ -58716,13 +73634,22 @@ var ts;
             }
             return statements;
         }
+        /**
+         * Appends the exports of a ClassDeclaration or FunctionDeclaration to a statement list,
+         * returning the statement list.
+         *
+         * @param statements A statement list to which the down-level export statements are to be
+         * appended. If `statements` is `undefined`, a new array is allocated if statements are
+         * appended.
+         * @param decl The declaration whose exports are to be recorded.
+         */
         function appendExportsOfHoistedDeclaration(statements, decl) {
             if (moduleInfo.exportEquals) {
                 return statements;
             }
             var excludeName;
-            if (ts.hasModifier(decl, 1)) {
-                var exportName = ts.hasModifier(decl, 512) ? ts.createLiteral("default") : decl.name;
+            if (ts.hasModifier(decl, 1 /* Export */)) {
+                var exportName = ts.hasModifier(decl, 512 /* Default */) ? ts.createLiteral("default") : decl.name;
                 statements = appendExportStatement(statements, exportName, ts.getLocalName(decl));
                 excludeName = ts.getTextOfIdentifierOrLiteral(exportName);
             }
@@ -58731,6 +73658,15 @@ var ts;
             }
             return statements;
         }
+        /**
+         * Appends the exports of a declaration to a statement list, returning the statement list.
+         *
+         * @param statements A statement list to which the down-level export statements are to be
+         * appended. If `statements` is `undefined`, a new array is allocated if statements are
+         * appended.
+         * @param decl The declaration to export.
+         * @param excludeName An optional name to exclude from exports.
+         */
         function appendExportsOfDeclaration(statements, decl, excludeName) {
             if (moduleInfo.exportEquals) {
                 return statements;
@@ -58747,67 +73683,104 @@ var ts;
             }
             return statements;
         }
+        /**
+         * Appends the down-level representation of an export to a statement list, returning the
+         * statement list.
+         *
+         * @param statements A statement list to which the down-level export statements are to be
+         * appended. If `statements` is `undefined`, a new array is allocated if statements are
+         * appended.
+         * @param exportName The name of the export.
+         * @param expression The expression to export.
+         * @param allowComments Whether to allow comments on the export.
+         */
         function appendExportStatement(statements, exportName, expression, allowComments) {
             statements = ts.append(statements, createExportStatement(exportName, expression, allowComments));
             return statements;
         }
+        /**
+         * Creates a call to the current file's export function to export a value.
+         *
+         * @param name The bound name of the export.
+         * @param value The exported value.
+         * @param allowComments An optional value indicating whether to emit comments for the statement.
+         */
         function createExportStatement(name, value, allowComments) {
             var statement = ts.createStatement(createExportExpression(name, value));
             ts.startOnNewLine(statement);
             if (!allowComments) {
-                ts.setEmitFlags(statement, 1536);
+                ts.setEmitFlags(statement, 1536 /* NoComments */);
             }
             return statement;
         }
+        /**
+         * Creates a call to the current file's export function to export a value.
+         *
+         * @param name The bound name of the export.
+         * @param value The exported value.
+         */
         function createExportExpression(name, value) {
             var exportName = ts.isIdentifier(name) ? ts.createLiteral(name) : name;
-            ts.setEmitFlags(value, ts.getEmitFlags(value) | 1536);
-            return ts.setCommentRange(ts.createCall(exportFunction, undefined, [exportName, value]), value);
+            ts.setEmitFlags(value, ts.getEmitFlags(value) | 1536 /* NoComments */);
+            return ts.setCommentRange(ts.createCall(exportFunction, /*typeArguments*/ undefined, [exportName, value]), value);
         }
+        //
+        // Top-Level or Nested Source Element Visitors
+        //
+        /**
+         * Visit nested elements at the top-level of a module.
+         *
+         * @param node The node to visit.
+         */
         function nestedElementVisitor(node) {
             switch (node.kind) {
-                case 214:
+                case 214 /* VariableStatement */:
                     return visitVariableStatement(node);
-                case 234:
+                case 234 /* FunctionDeclaration */:
                     return visitFunctionDeclaration(node);
-                case 235:
+                case 235 /* ClassDeclaration */:
                     return visitClassDeclaration(node);
-                case 220:
+                case 220 /* ForStatement */:
                     return visitForStatement(node);
-                case 221:
+                case 221 /* ForInStatement */:
                     return visitForInStatement(node);
-                case 222:
+                case 222 /* ForOfStatement */:
                     return visitForOfStatement(node);
-                case 218:
+                case 218 /* DoStatement */:
                     return visitDoStatement(node);
-                case 219:
+                case 219 /* WhileStatement */:
                     return visitWhileStatement(node);
-                case 228:
+                case 228 /* LabeledStatement */:
                     return visitLabeledStatement(node);
-                case 226:
+                case 226 /* WithStatement */:
                     return visitWithStatement(node);
-                case 227:
+                case 227 /* SwitchStatement */:
                     return visitSwitchStatement(node);
-                case 241:
+                case 241 /* CaseBlock */:
                     return visitCaseBlock(node);
-                case 266:
+                case 266 /* CaseClause */:
                     return visitCaseClause(node);
-                case 267:
+                case 267 /* DefaultClause */:
                     return visitDefaultClause(node);
-                case 230:
+                case 230 /* TryStatement */:
                     return visitTryStatement(node);
-                case 269:
+                case 269 /* CatchClause */:
                     return visitCatchClause(node);
-                case 213:
+                case 213 /* Block */:
                     return visitBlock(node);
-                case 303:
+                case 303 /* MergeDeclarationMarker */:
                     return visitMergeDeclarationMarker(node);
-                case 304:
+                case 304 /* EndOfDeclarationMarker */:
                     return visitEndOfDeclarationMarker(node);
                 default:
                     return destructuringAndImportCallVisitor(node);
             }
         }
+        /**
+         * Visits the body of a ForStatement to hoist declarations.
+         *
+         * @param node The node to visit.
+         */
         function visitForStatement(node) {
             var savedEnclosingBlockScopedContainer = enclosingBlockScopedContainer;
             enclosingBlockScopedContainer = node;
@@ -58815,6 +73788,11 @@ var ts;
             enclosingBlockScopedContainer = savedEnclosingBlockScopedContainer;
             return node;
         }
+        /**
+         * Visits the body of a ForInStatement to hoist declarations.
+         *
+         * @param node The node to visit.
+         */
         function visitForInStatement(node) {
             var savedEnclosingBlockScopedContainer = enclosingBlockScopedContainer;
             enclosingBlockScopedContainer = node;
@@ -58822,6 +73800,11 @@ var ts;
             enclosingBlockScopedContainer = savedEnclosingBlockScopedContainer;
             return node;
         }
+        /**
+         * Visits the body of a ForOfStatement to hoist declarations.
+         *
+         * @param node The node to visit.
+         */
         function visitForOfStatement(node) {
             var savedEnclosingBlockScopedContainer = enclosingBlockScopedContainer;
             enclosingBlockScopedContainer = node;
@@ -58829,16 +73812,27 @@ var ts;
             enclosingBlockScopedContainer = savedEnclosingBlockScopedContainer;
             return node;
         }
+        /**
+         * Determines whether to hoist the initializer of a ForStatement, ForInStatement, or
+         * ForOfStatement.
+         *
+         * @param node The node to test.
+         */
         function shouldHoistForInitializer(node) {
             return ts.isVariableDeclarationList(node)
                 && shouldHoistVariableDeclarationList(node);
         }
+        /**
+         * Visits the initializer of a ForStatement, ForInStatement, or ForOfStatement
+         *
+         * @param node The node to visit.
+         */
         function visitForInitializer(node) {
             if (shouldHoistForInitializer(node)) {
                 var expressions = void 0;
                 for (var _i = 0, _a = node.declarations; _i < _a.length; _i++) {
                     var variable = _a[_i];
-                    expressions = ts.append(expressions, transformInitializedVariable(variable, false));
+                    expressions = ts.append(expressions, transformInitializedVariable(variable, /*isExportedDeclaration*/ false));
                     if (!variable.initializer) {
                         hoistBindingElement(variable);
                     }
@@ -58849,21 +73843,51 @@ var ts;
                 return ts.visitEachChild(node, nestedElementVisitor, context);
             }
         }
+        /**
+         * Visits the body of a DoStatement to hoist declarations.
+         *
+         * @param node The node to visit.
+         */
         function visitDoStatement(node) {
             return ts.updateDo(node, ts.visitNode(node.statement, nestedElementVisitor, ts.isStatement, ts.liftToBlock), ts.visitNode(node.expression, destructuringAndImportCallVisitor, ts.isExpression));
         }
+        /**
+         * Visits the body of a WhileStatement to hoist declarations.
+         *
+         * @param node The node to visit.
+         */
         function visitWhileStatement(node) {
             return ts.updateWhile(node, ts.visitNode(node.expression, destructuringAndImportCallVisitor, ts.isExpression), ts.visitNode(node.statement, nestedElementVisitor, ts.isStatement, ts.liftToBlock));
         }
+        /**
+         * Visits the body of a LabeledStatement to hoist declarations.
+         *
+         * @param node The node to visit.
+         */
         function visitLabeledStatement(node) {
             return ts.updateLabel(node, node.label, ts.visitNode(node.statement, nestedElementVisitor, ts.isStatement, ts.liftToBlock));
         }
+        /**
+         * Visits the body of a WithStatement to hoist declarations.
+         *
+         * @param node The node to visit.
+         */
         function visitWithStatement(node) {
             return ts.updateWith(node, ts.visitNode(node.expression, destructuringAndImportCallVisitor, ts.isExpression), ts.visitNode(node.statement, nestedElementVisitor, ts.isStatement, ts.liftToBlock));
         }
+        /**
+         * Visits the body of a SwitchStatement to hoist declarations.
+         *
+         * @param node The node to visit.
+         */
         function visitSwitchStatement(node) {
             return ts.updateSwitch(node, ts.visitNode(node.expression, destructuringAndImportCallVisitor, ts.isExpression), ts.visitNode(node.caseBlock, nestedElementVisitor, ts.isCaseBlock));
         }
+        /**
+         * Visits the body of a CaseBlock to hoist declarations.
+         *
+         * @param node The node to visit.
+         */
         function visitCaseBlock(node) {
             var savedEnclosingBlockScopedContainer = enclosingBlockScopedContainer;
             enclosingBlockScopedContainer = node;
@@ -58871,15 +73895,35 @@ var ts;
             enclosingBlockScopedContainer = savedEnclosingBlockScopedContainer;
             return node;
         }
+        /**
+         * Visits the body of a CaseClause to hoist declarations.
+         *
+         * @param node The node to visit.
+         */
         function visitCaseClause(node) {
             return ts.updateCaseClause(node, ts.visitNode(node.expression, destructuringAndImportCallVisitor, ts.isExpression), ts.visitNodes(node.statements, nestedElementVisitor, ts.isStatement));
         }
+        /**
+         * Visits the body of a DefaultClause to hoist declarations.
+         *
+         * @param node The node to visit.
+         */
         function visitDefaultClause(node) {
             return ts.visitEachChild(node, nestedElementVisitor, context);
         }
+        /**
+         * Visits the body of a TryStatement to hoist declarations.
+         *
+         * @param node The node to visit.
+         */
         function visitTryStatement(node) {
             return ts.visitEachChild(node, nestedElementVisitor, context);
         }
+        /**
+         * Visits the body of a CatchClause to hoist declarations.
+         *
+         * @param node The node to visit.
+         */
         function visitCatchClause(node) {
             var savedEnclosingBlockScopedContainer = enclosingBlockScopedContainer;
             enclosingBlockScopedContainer = node;
@@ -58887,6 +73931,11 @@ var ts;
             enclosingBlockScopedContainer = savedEnclosingBlockScopedContainer;
             return node;
         }
+        /**
+         * Visits the body of a Block to hoist declarations.
+         *
+         * @param node The node to visit.
+         */
         function visitBlock(node) {
             var savedEnclosingBlockScopedContainer = enclosingBlockScopedContainer;
             enclosingBlockScopedContainer = node;
@@ -58894,15 +73943,23 @@ var ts;
             enclosingBlockScopedContainer = savedEnclosingBlockScopedContainer;
             return node;
         }
+        //
+        // Destructuring Assignment Visitors
+        //
+        /**
+         * Visit nodes to flatten destructuring assignments to exported symbols.
+         *
+         * @param node The node to visit.
+         */
         function destructuringAndImportCallVisitor(node) {
-            if (node.transformFlags & 1024
-                && node.kind === 200) {
+            if (node.transformFlags & 1024 /* DestructuringAssignment */
+                && node.kind === 200 /* BinaryExpression */) {
                 return visitDestructuringAssignment(node);
             }
             else if (ts.isImportCall(node)) {
                 return visitImportCallExpression(node);
             }
-            else if ((node.transformFlags & 2048) || (node.transformFlags & 67108864)) {
+            else if ((node.transformFlags & 2048 /* ContainsDestructuringAssignment */) || (node.transformFlags & 67108864 /* ContainsDynamicImport */)) {
                 return ts.visitEachChild(node, destructuringAndImportCallVisitor, context);
             }
             else {
@@ -58910,16 +73967,38 @@ var ts;
             }
         }
         function visitImportCallExpression(node) {
-            return ts.createCall(ts.createPropertyAccess(contextObject, ts.createIdentifier("import")), undefined, ts.some(node.arguments) ? [ts.visitNode(node.arguments[0], destructuringAndImportCallVisitor)] : []);
+            // import("./blah")
+            // emit as
+            // System.register([], function (_export, _context) {
+            //     return {
+            //         setters: [],
+            //         execute: () => {
+            //             _context.import('./blah');
+            //         }
+            //     };
+            // });
+            return ts.createCall(ts.createPropertyAccess(contextObject, ts.createIdentifier("import")), 
+            /*typeArguments*/ undefined, ts.some(node.arguments) ? [ts.visitNode(node.arguments[0], destructuringAndImportCallVisitor)] : []);
         }
+        /**
+         * Visits a DestructuringAssignment to flatten destructuring to exported symbols.
+         *
+         * @param node The node to visit.
+         */
         function visitDestructuringAssignment(node) {
             if (hasExportedReferenceInDestructuringTarget(node.left)) {
-                return ts.flattenDestructuringAssignment(node, destructuringAndImportCallVisitor, context, 0, true);
+                return ts.flattenDestructuringAssignment(node, destructuringAndImportCallVisitor, context, 0 /* All */, 
+                /*needsValue*/ true);
             }
             return ts.visitEachChild(node, destructuringAndImportCallVisitor, context);
         }
+        /**
+         * Determines whether the target of a destructuring assigment refers to an exported symbol.
+         *
+         * @param node The destructuring target.
+         */
         function hasExportedReferenceInDestructuringTarget(node) {
-            if (ts.isAssignmentExpression(node, true)) {
+            if (ts.isAssignmentExpression(node, /*excludeCompoundAssignment*/ true)) {
                 return hasExportedReferenceInDestructuringTarget(node.left);
             }
             else if (ts.isSpreadElement(node)) {
@@ -58939,22 +74018,40 @@ var ts;
             }
             else if (ts.isIdentifier(node)) {
                 var container = resolver.getReferencedExportContainer(node);
-                return container !== undefined && container.kind === 274;
+                return container !== undefined && container.kind === 274 /* SourceFile */;
             }
             else {
                 return false;
             }
         }
+        //
+        // Modifier Visitors
+        //
+        /**
+         * Visit nodes to elide module-specific modifiers.
+         *
+         * @param node The node to visit.
+         */
         function modifierVisitor(node) {
             switch (node.kind) {
-                case 84:
-                case 79:
+                case 84 /* ExportKeyword */:
+                case 79 /* DefaultKeyword */:
                     return undefined;
             }
             return node;
         }
+        //
+        // Emit Notification
+        //
+        /**
+         * Hook for node emit notifications.
+         *
+         * @param hint A hint as to the intended usage of the node.
+         * @param node The node to emit.
+         * @param emitCallback A callback used to emit the node in the printer.
+         */
         function onEmitNode(hint, node, emitCallback) {
-            if (node.kind === 274) {
+            if (node.kind === 274 /* SourceFile */) {
                 var id = ts.getOriginalNodeId(node);
                 currentSourceFile = node;
                 moduleInfo = moduleInfoMap[id];
@@ -58973,75 +74070,127 @@ var ts;
                 previousOnEmitNode(hint, node, emitCallback);
             }
         }
+        //
+        // Substitutions
+        //
+        /**
+         * Hooks node substitutions.
+         *
+         * @param hint A hint as to the intended usage of the node.
+         * @param node The node to substitute.
+         */
         function onSubstituteNode(hint, node) {
             node = previousOnSubstituteNode(hint, node);
             if (isSubstitutionPrevented(node)) {
                 return node;
             }
-            if (hint === 1) {
+            if (hint === 1 /* Expression */) {
                 return substituteExpression(node);
             }
-            else if (hint === 4) {
+            else if (hint === 4 /* Unspecified */) {
                 return substituteUnspecified(node);
             }
             return node;
         }
+        /**
+         * Substitute the node, if necessary.
+         *
+         * @param node The node to substitute.
+         */
         function substituteUnspecified(node) {
             switch (node.kind) {
-                case 271:
+                case 271 /* ShorthandPropertyAssignment */:
                     return substituteShorthandPropertyAssignment(node);
             }
             return node;
         }
+        /**
+         * Substitution for a ShorthandPropertyAssignment whose name that may contain an imported or exported symbol.
+         *
+         * @param node The node to substitute.
+         */
         function substituteShorthandPropertyAssignment(node) {
             var name = node.name;
             if (!ts.isGeneratedIdentifier(name) && !ts.isLocalName(name)) {
                 var importDeclaration = resolver.getReferencedImportDeclaration(name);
                 if (importDeclaration) {
                     if (ts.isImportClause(importDeclaration)) {
-                        return ts.setTextRange(ts.createPropertyAssignment(ts.getSynthesizedClone(name), ts.createPropertyAccess(ts.getGeneratedNameForNode(importDeclaration.parent), ts.createIdentifier("default"))), node);
+                        return ts.setTextRange(ts.createPropertyAssignment(ts.getSynthesizedClone(name), ts.createPropertyAccess(ts.getGeneratedNameForNode(importDeclaration.parent), ts.createIdentifier("default"))), 
+                        /*location*/ node);
                     }
                     else if (ts.isImportSpecifier(importDeclaration)) {
-                        return ts.setTextRange(ts.createPropertyAssignment(ts.getSynthesizedClone(name), ts.createPropertyAccess(ts.getGeneratedNameForNode(importDeclaration.parent.parent.parent), ts.getSynthesizedClone(importDeclaration.propertyName || importDeclaration.name))), node);
+                        return ts.setTextRange(ts.createPropertyAssignment(ts.getSynthesizedClone(name), ts.createPropertyAccess(ts.getGeneratedNameForNode(importDeclaration.parent.parent.parent), ts.getSynthesizedClone(importDeclaration.propertyName || importDeclaration.name))), 
+                        /*location*/ node);
                     }
                 }
             }
             return node;
         }
+        /**
+         * Substitute the expression, if necessary.
+         *
+         * @param node The node to substitute.
+         */
         function substituteExpression(node) {
             switch (node.kind) {
-                case 71:
+                case 71 /* Identifier */:
                     return substituteExpressionIdentifier(node);
-                case 200:
+                case 200 /* BinaryExpression */:
                     return substituteBinaryExpression(node);
-                case 198:
-                case 199:
+                case 198 /* PrefixUnaryExpression */:
+                case 199 /* PostfixUnaryExpression */:
                     return substituteUnaryExpression(node);
             }
             return node;
         }
+        /**
+         * Substitution for an Identifier expression that may contain an imported or exported symbol.
+         *
+         * @param node The node to substitute.
+         */
         function substituteExpressionIdentifier(node) {
-            if (ts.getEmitFlags(node) & 4096) {
+            if (ts.getEmitFlags(node) & 4096 /* HelperName */) {
                 var externalHelpersModuleName = ts.getExternalHelpersModuleName(currentSourceFile);
                 if (externalHelpersModuleName) {
                     return ts.createPropertyAccess(externalHelpersModuleName, node);
                 }
                 return node;
             }
+            // When we see an identifier in an expression position that
+            // points to an imported symbol, we should substitute a qualified
+            // reference to the imported symbol if one is needed.
+            //
+            // - We do not substitute generated identifiers for any reason.
+            // - We do not substitute identifiers tagged with the LocalName flag.
             if (!ts.isGeneratedIdentifier(node) && !ts.isLocalName(node)) {
                 var importDeclaration = resolver.getReferencedImportDeclaration(node);
                 if (importDeclaration) {
                     if (ts.isImportClause(importDeclaration)) {
-                        return ts.setTextRange(ts.createPropertyAccess(ts.getGeneratedNameForNode(importDeclaration.parent), ts.createIdentifier("default")), node);
+                        return ts.setTextRange(ts.createPropertyAccess(ts.getGeneratedNameForNode(importDeclaration.parent), ts.createIdentifier("default")), 
+                        /*location*/ node);
                     }
                     else if (ts.isImportSpecifier(importDeclaration)) {
-                        return ts.setTextRange(ts.createPropertyAccess(ts.getGeneratedNameForNode(importDeclaration.parent.parent.parent), ts.getSynthesizedClone(importDeclaration.propertyName || importDeclaration.name)), node);
+                        return ts.setTextRange(ts.createPropertyAccess(ts.getGeneratedNameForNode(importDeclaration.parent.parent.parent), ts.getSynthesizedClone(importDeclaration.propertyName || importDeclaration.name)), 
+                        /*location*/ node);
                     }
                 }
             }
             return node;
         }
+        /**
+         * Substitution for a BinaryExpression that may contain an imported or exported symbol.
+         *
+         * @param node The node to substitute.
+         */
         function substituteBinaryExpression(node) {
+            // When we see an assignment expression whose left-hand side is an exported symbol,
+            // we should ensure all exports of that symbol are updated with the correct value.
+            //
+            // - We do not substitute generated identifiers for any reason.
+            // - We do not substitute identifiers tagged with the LocalName flag.
+            // - We do not substitute identifiers that were originally the name of an enum or
+            //   namespace due to how they are transformed in TypeScript.
+            // - We only substitute identifiers that are exported at the top level.
             if (ts.isAssignmentOperator(node.operatorToken.kind)
                 && ts.isIdentifier(node.left)
                 && !ts.isGeneratedIdentifier(node.left)
@@ -59049,6 +74198,7 @@ var ts;
                 && !ts.isDeclarationNameOfEnumOrNamespace(node.left)) {
                 var exportedNames = getExports(node.left);
                 if (exportedNames) {
+                    // For each additional export of the declaration, apply an export assignment.
                     var expression = node;
                     for (var _i = 0, exportedNames_4 = exportedNames; _i < exportedNames_4.length; _i++) {
                         var exportName = exportedNames_4[_i];
@@ -59059,23 +74209,37 @@ var ts;
             }
             return node;
         }
+        /**
+         * Substitution for a UnaryExpression that may contain an imported or exported symbol.
+         *
+         * @param node The node to substitute.
+         */
         function substituteUnaryExpression(node) {
-            if ((node.operator === 43 || node.operator === 44)
+            // When we see a prefix or postfix increment expression whose operand is an exported
+            // symbol, we should ensure all exports of that symbol are updated with the correct
+            // value.
+            //
+            // - We do not substitute generated identifiers for any reason.
+            // - We do not substitute identifiers tagged with the LocalName flag.
+            // - We do not substitute identifiers that were originally the name of an enum or
+            //   namespace due to how they are transformed in TypeScript.
+            // - We only substitute identifiers that are exported at the top level.
+            if ((node.operator === 43 /* PlusPlusToken */ || node.operator === 44 /* MinusMinusToken */)
                 && ts.isIdentifier(node.operand)
                 && !ts.isGeneratedIdentifier(node.operand)
                 && !ts.isLocalName(node.operand)
                 && !ts.isDeclarationNameOfEnumOrNamespace(node.operand)) {
                 var exportedNames = getExports(node.operand);
                 if (exportedNames) {
-                    var expression = node.kind === 199
+                    var expression = node.kind === 199 /* PostfixUnaryExpression */
                         ? ts.setTextRange(ts.createPrefix(node.operator, node.operand), node)
                         : node;
                     for (var _i = 0, exportedNames_5 = exportedNames; _i < exportedNames_5.length; _i++) {
                         var exportName = exportedNames_5[_i];
                         expression = createExportExpression(exportName, preventSubstitution(expression));
                     }
-                    if (node.kind === 199) {
-                        expression = node.operator === 43
+                    if (node.kind === 199 /* PostfixUnaryExpression */) {
+                        expression = node.operator === 43 /* PlusPlusToken */
                             ? ts.createSubtract(preventSubstitution(expression), ts.createLiteral(1))
                             : ts.createAdd(preventSubstitution(expression), ts.createLiteral(1));
                     }
@@ -59084,14 +74248,19 @@ var ts;
             }
             return node;
         }
+        /**
+         * Gets the exports of a name.
+         *
+         * @param name The name.
+         */
         function getExports(name) {
             var exportedNames;
             if (!ts.isGeneratedIdentifier(name)) {
                 var valueDeclaration = resolver.getReferencedImportDeclaration(name)
                     || resolver.getReferencedValueDeclaration(name);
                 if (valueDeclaration) {
-                    var exportContainer = resolver.getReferencedExportContainer(name, false);
-                    if (exportContainer && exportContainer.kind === 274) {
+                    var exportContainer = resolver.getReferencedExportContainer(name, /*prefixLocals*/ false);
+                    if (exportContainer && exportContainer.kind === 274 /* SourceFile */) {
                         exportedNames = ts.append(exportedNames, ts.getDeclarationName(valueDeclaration));
                     }
                     exportedNames = ts.addRange(exportedNames, moduleInfo && moduleInfo.exportedBindings[ts.getOriginalNodeId(valueDeclaration)]);
@@ -59099,18 +74268,29 @@ var ts;
             }
             return exportedNames;
         }
+        /**
+         * Prevent substitution of a node for this transformer.
+         *
+         * @param node The node which should not be substituted.
+         */
         function preventSubstitution(node) {
             if (noSubstitution === undefined)
                 noSubstitution = [];
             noSubstitution[ts.getNodeId(node)] = true;
             return node;
         }
+        /**
+         * Determines whether a node should not be substituted.
+         *
+         * @param node The node to test.
+         */
         function isSubstitutionPrevented(node) {
             return noSubstitution && node.id && noSubstitution[node.id];
         }
     }
     ts.transformSystemModule = transformSystemModule;
 })(ts || (ts = {}));
+/*@internal*/
 var ts;
 (function (ts) {
     function transformES2015Module(context) {
@@ -59119,8 +74299,8 @@ var ts;
         var previousOnSubstituteNode = context.onSubstituteNode;
         context.onEmitNode = onEmitNode;
         context.onSubstituteNode = onSubstituteNode;
-        context.enableEmitNotification(274);
-        context.enableSubstitution(71);
+        context.enableEmitNotification(274 /* SourceFile */);
+        context.enableSubstitution(71 /* Identifier */);
         var currentSourceFile;
         return ts.chainBundle(transformSourceFile);
         function transformSourceFile(node) {
@@ -59132,8 +74312,10 @@ var ts;
                 if (externalHelpersModuleName) {
                     var statements = [];
                     var statementOffset = ts.addPrologue(statements, node.statements);
-                    var tslibImport = ts.createImportDeclaration(undefined, undefined, ts.createImportClause(undefined, ts.createNamespaceImport(externalHelpersModuleName)), ts.createLiteral(ts.externalHelpersModuleNameText));
-                    ts.addEmitFlags(tslibImport, 67108864);
+                    var tslibImport = ts.createImportDeclaration(
+                    /*decorators*/ undefined, 
+                    /*modifiers*/ undefined, ts.createImportClause(/*name*/ undefined, ts.createNamespaceImport(externalHelpersModuleName)), ts.createLiteral(ts.externalHelpersModuleNameText));
+                    ts.addEmitFlags(tslibImport, 67108864 /* NeverApplyImportHelper */);
                     ts.append(statements, tslibImport);
                     ts.addRange(statements, ts.visitNodes(node.statements, visitor, ts.isStatement, statementOffset));
                     return ts.updateSourceFileNode(node, ts.setTextRange(ts.createNodeArray(statements), node.statements));
@@ -59146,16 +74328,28 @@ var ts;
         }
         function visitor(node) {
             switch (node.kind) {
-                case 243:
+                case 243 /* ImportEqualsDeclaration */:
+                    // Elide `import=` as it is not legal with --module ES6
                     return undefined;
-                case 249:
+                case 249 /* ExportAssignment */:
                     return visitExportAssignment(node);
             }
             return node;
         }
         function visitExportAssignment(node) {
+            // Elide `export=` as it is not legal with --module ES6
             return node.isExportEquals ? undefined : node;
         }
+        //
+        // Emit Notification
+        //
+        /**
+         * Hook for node emit.
+         *
+         * @param hint A hint as to the intended usage of the node.
+         * @param node The node to emit.
+         * @param emit A callback used to emit the node in the printer.
+         */
         function onEmitNode(hint, node, emitCallback) {
             if (ts.isSourceFile(node)) {
                 currentSourceFile = node;
@@ -59166,15 +74360,24 @@ var ts;
                 previousOnEmitNode(hint, node, emitCallback);
             }
         }
+        //
+        // Substitutions
+        //
+        /**
+         * Hooks node substitutions.
+         *
+         * @param hint A hint as to the intended usage of the node.
+         * @param node The node to substitute.
+         */
         function onSubstituteNode(hint, node) {
             node = previousOnSubstituteNode(hint, node);
-            if (ts.isIdentifier(node) && hint === 1) {
+            if (ts.isIdentifier(node) && hint === 1 /* Expression */) {
                 return substituteExpressionIdentifier(node);
             }
             return node;
         }
         function substituteExpressionIdentifier(node) {
-            if (ts.getEmitFlags(node) & 4096) {
+            if (ts.getEmitFlags(node) & 4096 /* HelperName */) {
                 var externalHelpersModuleName = ts.getExternalHelpersModuleName(currentSourceFile);
                 if (externalHelpersModuleName) {
                     return ts.createPropertyAccess(externalHelpersModuleName, node);
@@ -59185,6 +74388,7 @@ var ts;
     }
     ts.transformES2015Module = transformES2015Module;
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     function canProduceDiagnostics(node) {
@@ -59227,16 +74431,16 @@ var ts;
             } : undefined;
         }
         function getAccessorNameVisibilityDiagnosticMessage(symbolAccessibilityResult) {
-            if (ts.hasModifier(node, 32)) {
+            if (ts.hasModifier(node, 32 /* Static */)) {
                 return symbolAccessibilityResult.errorModuleName ?
-                    symbolAccessibilityResult.accessibility === 2 ?
+                    symbolAccessibilityResult.accessibility === 2 /* CannotBeNamed */ ?
                         ts.Diagnostics.Public_static_property_0_of_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named :
                         ts.Diagnostics.Public_static_property_0_of_exported_class_has_or_is_using_name_1_from_private_module_2 :
                     ts.Diagnostics.Public_static_property_0_of_exported_class_has_or_is_using_private_name_1;
             }
-            else if (node.parent.kind === 235) {
+            else if (node.parent.kind === 235 /* ClassDeclaration */) {
                 return symbolAccessibilityResult.errorModuleName ?
-                    symbolAccessibilityResult.accessibility === 2 ?
+                    symbolAccessibilityResult.accessibility === 2 /* CannotBeNamed */ ?
                         ts.Diagnostics.Public_property_0_of_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named :
                         ts.Diagnostics.Public_property_0_of_exported_class_has_or_is_using_name_1_from_private_module_2 :
                     ts.Diagnostics.Public_property_0_of_exported_class_has_or_is_using_private_name_1;
@@ -59256,16 +74460,16 @@ var ts;
             } : undefined;
         }
         function getMethodNameVisibilityDiagnosticMessage(symbolAccessibilityResult) {
-            if (ts.hasModifier(node, 32)) {
+            if (ts.hasModifier(node, 32 /* Static */)) {
                 return symbolAccessibilityResult.errorModuleName ?
-                    symbolAccessibilityResult.accessibility === 2 ?
+                    symbolAccessibilityResult.accessibility === 2 /* CannotBeNamed */ ?
                         ts.Diagnostics.Public_static_method_0_of_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named :
                         ts.Diagnostics.Public_static_method_0_of_exported_class_has_or_is_using_name_1_from_private_module_2 :
                     ts.Diagnostics.Public_static_method_0_of_exported_class_has_or_is_using_private_name_1;
             }
-            else if (node.parent.kind === 235) {
+            else if (node.parent.kind === 235 /* ClassDeclaration */) {
                 return symbolAccessibilityResult.errorModuleName ?
-                    symbolAccessibilityResult.accessibility === 2 ?
+                    symbolAccessibilityResult.accessibility === 2 /* CannotBeNamed */ ?
                         ts.Diagnostics.Public_method_0_of_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named :
                         ts.Diagnostics.Public_method_0_of_exported_class_has_or_is_using_name_1_from_private_module_2 :
                     ts.Diagnostics.Public_method_0_of_exported_class_has_or_is_using_private_name_1;
@@ -59289,7 +74493,7 @@ var ts;
             return getReturnTypeVisibilityError;
         }
         else if (ts.isParameter(node)) {
-            if (ts.isParameterPropertyDeclaration(node) && ts.hasModifier(node.parent, 8)) {
+            if (ts.isParameterPropertyDeclaration(node) && ts.hasModifier(node.parent, 8 /* Private */)) {
                 return getVariableDeclarationTypeVisibilityError;
             }
             return getParameterDeclarationTypeVisibilityError;
@@ -59310,30 +74514,34 @@ var ts;
             return ts.Debug.assertNever(node, "Attempted to set a declaration diagnostic context for unhandled node kind: " + ts.SyntaxKind[node.kind]);
         }
         function getVariableDeclarationTypeVisibilityDiagnosticMessage(symbolAccessibilityResult) {
-            if (node.kind === 232 || node.kind === 182) {
+            if (node.kind === 232 /* VariableDeclaration */ || node.kind === 182 /* BindingElement */) {
                 return symbolAccessibilityResult.errorModuleName ?
-                    symbolAccessibilityResult.accessibility === 2 ?
+                    symbolAccessibilityResult.accessibility === 2 /* CannotBeNamed */ ?
                         ts.Diagnostics.Exported_variable_0_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named :
                         ts.Diagnostics.Exported_variable_0_has_or_is_using_name_1_from_private_module_2 :
                     ts.Diagnostics.Exported_variable_0_has_or_is_using_private_name_1;
             }
-            else if (node.kind === 152 || node.kind === 151 ||
-                (node.kind === 149 && ts.hasModifier(node.parent, 8))) {
-                if (ts.hasModifier(node, 32)) {
+            // This check is to ensure we don't report error on constructor parameter property as that error would be reported during parameter emit
+            // The only exception here is if the constructor was marked as private. we are not emitting the constructor parameters at all.
+            else if (node.kind === 152 /* PropertyDeclaration */ || node.kind === 151 /* PropertySignature */ ||
+                (node.kind === 149 /* Parameter */ && ts.hasModifier(node.parent, 8 /* Private */))) {
+                // TODO(jfreeman): Deal with computed properties in error reporting.
+                if (ts.hasModifier(node, 32 /* Static */)) {
                     return symbolAccessibilityResult.errorModuleName ?
-                        symbolAccessibilityResult.accessibility === 2 ?
+                        symbolAccessibilityResult.accessibility === 2 /* CannotBeNamed */ ?
                             ts.Diagnostics.Public_static_property_0_of_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named :
                             ts.Diagnostics.Public_static_property_0_of_exported_class_has_or_is_using_name_1_from_private_module_2 :
                         ts.Diagnostics.Public_static_property_0_of_exported_class_has_or_is_using_private_name_1;
                 }
-                else if (node.parent.kind === 235 || node.kind === 149) {
+                else if (node.parent.kind === 235 /* ClassDeclaration */ || node.kind === 149 /* Parameter */) {
                     return symbolAccessibilityResult.errorModuleName ?
-                        symbolAccessibilityResult.accessibility === 2 ?
+                        symbolAccessibilityResult.accessibility === 2 /* CannotBeNamed */ ?
                             ts.Diagnostics.Public_property_0_of_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named :
                             ts.Diagnostics.Public_property_0_of_exported_class_has_or_is_using_name_1_from_private_module_2 :
                         ts.Diagnostics.Public_property_0_of_exported_class_has_or_is_using_private_name_1;
                 }
                 else {
+                    // Interfaces cannot have types that cannot be named
                     return symbolAccessibilityResult.errorModuleName ?
                         ts.Diagnostics.Property_0_of_exported_interface_has_or_is_using_name_1_from_private_module_2 :
                         ts.Diagnostics.Property_0_of_exported_interface_has_or_is_using_private_name_1;
@@ -59350,8 +74558,10 @@ var ts;
         }
         function getAccessorDeclarationTypeVisibilityError(symbolAccessibilityResult) {
             var diagnosticMessage;
-            if (node.kind === 157) {
-                if (ts.hasModifier(node, 32)) {
+            if (node.kind === 157 /* SetAccessor */) {
+                // Getters can infer the return type from the returned expression, but setters cannot, so the
+                // "_from_external_module_1_but_cannot_be_named" case cannot occur.
+                if (ts.hasModifier(node, 32 /* Static */)) {
                     diagnosticMessage = symbolAccessibilityResult.errorModuleName ?
                         ts.Diagnostics.Parameter_type_of_public_static_setter_0_from_exported_class_has_or_is_using_name_1_from_private_module_2 :
                         ts.Diagnostics.Parameter_type_of_public_static_setter_0_from_exported_class_has_or_is_using_private_name_1;
@@ -59363,16 +74573,16 @@ var ts;
                 }
             }
             else {
-                if (ts.hasModifier(node, 32)) {
+                if (ts.hasModifier(node, 32 /* Static */)) {
                     diagnosticMessage = symbolAccessibilityResult.errorModuleName ?
-                        symbolAccessibilityResult.accessibility === 2 ?
+                        symbolAccessibilityResult.accessibility === 2 /* CannotBeNamed */ ?
                             ts.Diagnostics.Return_type_of_public_static_getter_0_from_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named :
                             ts.Diagnostics.Return_type_of_public_static_getter_0_from_exported_class_has_or_is_using_name_1_from_private_module_2 :
                         ts.Diagnostics.Return_type_of_public_static_getter_0_from_exported_class_has_or_is_using_private_name_1;
                 }
                 else {
                     diagnosticMessage = symbolAccessibilityResult.errorModuleName ?
-                        symbolAccessibilityResult.accessibility === 2 ?
+                        symbolAccessibilityResult.accessibility === 2 /* CannotBeNamed */ ?
                             ts.Diagnostics.Return_type_of_public_getter_0_from_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named :
                             ts.Diagnostics.Return_type_of_public_getter_0_from_exported_class_has_or_is_using_name_1_from_private_module_2 :
                         ts.Diagnostics.Return_type_of_public_getter_0_from_exported_class_has_or_is_using_private_name_1;
@@ -59387,46 +74597,50 @@ var ts;
         function getReturnTypeVisibilityError(symbolAccessibilityResult) {
             var diagnosticMessage;
             switch (node.kind) {
-                case 159:
+                case 159 /* ConstructSignature */:
+                    // Interfaces cannot have return types that cannot be named
                     diagnosticMessage = symbolAccessibilityResult.errorModuleName ?
                         ts.Diagnostics.Return_type_of_constructor_signature_from_exported_interface_has_or_is_using_name_0_from_private_module_1 :
                         ts.Diagnostics.Return_type_of_constructor_signature_from_exported_interface_has_or_is_using_private_name_0;
                     break;
-                case 158:
+                case 158 /* CallSignature */:
+                    // Interfaces cannot have return types that cannot be named
                     diagnosticMessage = symbolAccessibilityResult.errorModuleName ?
                         ts.Diagnostics.Return_type_of_call_signature_from_exported_interface_has_or_is_using_name_0_from_private_module_1 :
                         ts.Diagnostics.Return_type_of_call_signature_from_exported_interface_has_or_is_using_private_name_0;
                     break;
-                case 160:
+                case 160 /* IndexSignature */:
+                    // Interfaces cannot have return types that cannot be named
                     diagnosticMessage = symbolAccessibilityResult.errorModuleName ?
                         ts.Diagnostics.Return_type_of_index_signature_from_exported_interface_has_or_is_using_name_0_from_private_module_1 :
                         ts.Diagnostics.Return_type_of_index_signature_from_exported_interface_has_or_is_using_private_name_0;
                     break;
-                case 154:
-                case 153:
-                    if (ts.hasModifier(node, 32)) {
+                case 154 /* MethodDeclaration */:
+                case 153 /* MethodSignature */:
+                    if (ts.hasModifier(node, 32 /* Static */)) {
                         diagnosticMessage = symbolAccessibilityResult.errorModuleName ?
-                            symbolAccessibilityResult.accessibility === 2 ?
+                            symbolAccessibilityResult.accessibility === 2 /* CannotBeNamed */ ?
                                 ts.Diagnostics.Return_type_of_public_static_method_from_exported_class_has_or_is_using_name_0_from_external_module_1_but_cannot_be_named :
                                 ts.Diagnostics.Return_type_of_public_static_method_from_exported_class_has_or_is_using_name_0_from_private_module_1 :
                             ts.Diagnostics.Return_type_of_public_static_method_from_exported_class_has_or_is_using_private_name_0;
                     }
-                    else if (node.parent.kind === 235) {
+                    else if (node.parent.kind === 235 /* ClassDeclaration */) {
                         diagnosticMessage = symbolAccessibilityResult.errorModuleName ?
-                            symbolAccessibilityResult.accessibility === 2 ?
+                            symbolAccessibilityResult.accessibility === 2 /* CannotBeNamed */ ?
                                 ts.Diagnostics.Return_type_of_public_method_from_exported_class_has_or_is_using_name_0_from_external_module_1_but_cannot_be_named :
                                 ts.Diagnostics.Return_type_of_public_method_from_exported_class_has_or_is_using_name_0_from_private_module_1 :
                             ts.Diagnostics.Return_type_of_public_method_from_exported_class_has_or_is_using_private_name_0;
                     }
                     else {
+                        // Interfaces cannot have return types that cannot be named
                         diagnosticMessage = symbolAccessibilityResult.errorModuleName ?
                             ts.Diagnostics.Return_type_of_method_from_exported_interface_has_or_is_using_name_0_from_private_module_1 :
                             ts.Diagnostics.Return_type_of_method_from_exported_interface_has_or_is_using_private_name_0;
                     }
                     break;
-                case 234:
+                case 234 /* FunctionDeclaration */:
                     diagnosticMessage = symbolAccessibilityResult.errorModuleName ?
-                        symbolAccessibilityResult.accessibility === 2 ?
+                        symbolAccessibilityResult.accessibility === 2 /* CannotBeNamed */ ?
                             ts.Diagnostics.Return_type_of_exported_function_has_or_is_using_name_0_from_external_module_1_but_cannot_be_named :
                             ts.Diagnostics.Return_type_of_exported_function_has_or_is_using_name_0_from_private_module_1 :
                         ts.Diagnostics.Return_type_of_exported_function_has_or_is_using_private_name_0;
@@ -59449,50 +74663,54 @@ var ts;
         }
         function getParameterDeclarationTypeVisibilityDiagnosticMessage(symbolAccessibilityResult) {
             switch (node.parent.kind) {
-                case 155:
+                case 155 /* Constructor */:
                     return symbolAccessibilityResult.errorModuleName ?
-                        symbolAccessibilityResult.accessibility === 2 ?
+                        symbolAccessibilityResult.accessibility === 2 /* CannotBeNamed */ ?
                             ts.Diagnostics.Parameter_0_of_constructor_from_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named :
                             ts.Diagnostics.Parameter_0_of_constructor_from_exported_class_has_or_is_using_name_1_from_private_module_2 :
                         ts.Diagnostics.Parameter_0_of_constructor_from_exported_class_has_or_is_using_private_name_1;
-                case 159:
-                case 164:
+                case 159 /* ConstructSignature */:
+                case 164 /* ConstructorType */:
+                    // Interfaces cannot have parameter types that cannot be named
                     return symbolAccessibilityResult.errorModuleName ?
                         ts.Diagnostics.Parameter_0_of_constructor_signature_from_exported_interface_has_or_is_using_name_1_from_private_module_2 :
                         ts.Diagnostics.Parameter_0_of_constructor_signature_from_exported_interface_has_or_is_using_private_name_1;
-                case 158:
+                case 158 /* CallSignature */:
+                    // Interfaces cannot have parameter types that cannot be named
                     return symbolAccessibilityResult.errorModuleName ?
                         ts.Diagnostics.Parameter_0_of_call_signature_from_exported_interface_has_or_is_using_name_1_from_private_module_2 :
                         ts.Diagnostics.Parameter_0_of_call_signature_from_exported_interface_has_or_is_using_private_name_1;
-                case 160:
+                case 160 /* IndexSignature */:
+                    // Interfaces cannot have parameter types that cannot be named
                     return symbolAccessibilityResult.errorModuleName ?
                         ts.Diagnostics.Parameter_0_of_index_signature_from_exported_interface_has_or_is_using_name_1_from_private_module_2 :
                         ts.Diagnostics.Parameter_0_of_index_signature_from_exported_interface_has_or_is_using_private_name_1;
-                case 154:
-                case 153:
-                    if (ts.hasModifier(node.parent, 32)) {
+                case 154 /* MethodDeclaration */:
+                case 153 /* MethodSignature */:
+                    if (ts.hasModifier(node.parent, 32 /* Static */)) {
                         return symbolAccessibilityResult.errorModuleName ?
-                            symbolAccessibilityResult.accessibility === 2 ?
+                            symbolAccessibilityResult.accessibility === 2 /* CannotBeNamed */ ?
                                 ts.Diagnostics.Parameter_0_of_public_static_method_from_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named :
                                 ts.Diagnostics.Parameter_0_of_public_static_method_from_exported_class_has_or_is_using_name_1_from_private_module_2 :
                             ts.Diagnostics.Parameter_0_of_public_static_method_from_exported_class_has_or_is_using_private_name_1;
                     }
-                    else if (node.parent.parent.kind === 235) {
+                    else if (node.parent.parent.kind === 235 /* ClassDeclaration */) {
                         return symbolAccessibilityResult.errorModuleName ?
-                            symbolAccessibilityResult.accessibility === 2 ?
+                            symbolAccessibilityResult.accessibility === 2 /* CannotBeNamed */ ?
                                 ts.Diagnostics.Parameter_0_of_public_method_from_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named :
                                 ts.Diagnostics.Parameter_0_of_public_method_from_exported_class_has_or_is_using_name_1_from_private_module_2 :
                             ts.Diagnostics.Parameter_0_of_public_method_from_exported_class_has_or_is_using_private_name_1;
                     }
                     else {
+                        // Interfaces cannot have parameter types that cannot be named
                         return symbolAccessibilityResult.errorModuleName ?
                             ts.Diagnostics.Parameter_0_of_method_from_exported_interface_has_or_is_using_name_1_from_private_module_2 :
                             ts.Diagnostics.Parameter_0_of_method_from_exported_interface_has_or_is_using_private_name_1;
                     }
-                case 234:
-                case 163:
+                case 234 /* FunctionDeclaration */:
+                case 163 /* FunctionType */:
                     return symbolAccessibilityResult.errorModuleName ?
-                        symbolAccessibilityResult.accessibility === 2 ?
+                        symbolAccessibilityResult.accessibility === 2 /* CannotBeNamed */ ?
                             ts.Diagnostics.Parameter_0_of_exported_function_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named :
                             ts.Diagnostics.Parameter_0_of_exported_function_has_or_is_using_name_1_from_private_module_2 :
                         ts.Diagnostics.Parameter_0_of_exported_function_has_or_is_using_private_name_1;
@@ -59501,36 +74719,37 @@ var ts;
             }
         }
         function getTypeParameterConstraintVisibilityError() {
+            // Type parameter constraints are named by user so we should always be able to name it
             var diagnosticMessage;
             switch (node.parent.kind) {
-                case 235:
+                case 235 /* ClassDeclaration */:
                     diagnosticMessage = ts.Diagnostics.Type_parameter_0_of_exported_class_has_or_is_using_private_name_1;
                     break;
-                case 236:
+                case 236 /* InterfaceDeclaration */:
                     diagnosticMessage = ts.Diagnostics.Type_parameter_0_of_exported_interface_has_or_is_using_private_name_1;
                     break;
-                case 159:
+                case 159 /* ConstructSignature */:
                     diagnosticMessage = ts.Diagnostics.Type_parameter_0_of_constructor_signature_from_exported_interface_has_or_is_using_private_name_1;
                     break;
-                case 158:
+                case 158 /* CallSignature */:
                     diagnosticMessage = ts.Diagnostics.Type_parameter_0_of_call_signature_from_exported_interface_has_or_is_using_private_name_1;
                     break;
-                case 154:
-                case 153:
-                    if (ts.hasModifier(node.parent, 32)) {
+                case 154 /* MethodDeclaration */:
+                case 153 /* MethodSignature */:
+                    if (ts.hasModifier(node.parent, 32 /* Static */)) {
                         diagnosticMessage = ts.Diagnostics.Type_parameter_0_of_public_static_method_from_exported_class_has_or_is_using_private_name_1;
                     }
-                    else if (node.parent.parent.kind === 235) {
+                    else if (node.parent.parent.kind === 235 /* ClassDeclaration */) {
                         diagnosticMessage = ts.Diagnostics.Type_parameter_0_of_public_method_from_exported_class_has_or_is_using_private_name_1;
                     }
                     else {
                         diagnosticMessage = ts.Diagnostics.Type_parameter_0_of_method_from_exported_interface_has_or_is_using_private_name_1;
                     }
                     break;
-                case 234:
+                case 234 /* FunctionDeclaration */:
                     diagnosticMessage = ts.Diagnostics.Type_parameter_0_of_exported_function_has_or_is_using_private_name_1;
                     break;
-                case 237:
+                case 237 /* TypeAliasDeclaration */:
                     diagnosticMessage = ts.Diagnostics.Type_parameter_0_of_exported_type_alias_has_or_is_using_private_name_1;
                     break;
                 default:
@@ -59544,12 +74763,15 @@ var ts;
         }
         function getHeritageClauseVisibilityError() {
             var diagnosticMessage;
-            if (node.parent.parent.kind === 235) {
-                diagnosticMessage = node.parent.token === 108 ?
+            // Heritage clause is written by user so it can always be named
+            if (node.parent.parent.kind === 235 /* ClassDeclaration */) {
+                // Class or Interface implemented/extended is inaccessible
+                diagnosticMessage = node.parent.token === 108 /* ImplementsKeyword */ ?
                     ts.Diagnostics.Implements_clause_of_exported_class_0_has_or_is_using_private_name_1 :
                     ts.Diagnostics.extends_clause_of_exported_class_0_has_or_is_using_private_name_1;
             }
             else {
+                // interface is inaccessible
                 diagnosticMessage = ts.Diagnostics.extends_clause_of_exported_interface_0_has_or_is_using_private_name_1;
             }
             return {
@@ -59575,23 +74797,30 @@ var ts;
     }
     ts.createGetSymbolAccessibilityDiagnosticForNode = createGetSymbolAccessibilityDiagnosticForNode;
 })(ts || (ts = {}));
+/*@internal*/
 var ts;
 (function (ts) {
     function getDeclarationDiagnostics(host, resolver, file) {
         if (file && ts.isSourceFileJavaScript(file)) {
-            return [];
+            return []; // No declaration diagnostics for js for now
         }
         var compilerOptions = host.getCompilerOptions();
-        var result = ts.transformNodes(resolver, host, compilerOptions, file ? [file] : ts.filter(host.getSourceFiles(), ts.isSourceFileNotJavaScript), [transformDeclarations], false);
+        var result = ts.transformNodes(resolver, host, compilerOptions, file ? [file] : ts.filter(host.getSourceFiles(), ts.isSourceFileNotJavaScript), [transformDeclarations], /*allowDtsFiles*/ false);
         return result.diagnostics;
     }
     ts.getDeclarationDiagnostics = getDeclarationDiagnostics;
-    var declarationEmitNodeBuilderFlags = 1024 |
-        2048 |
-        4096 |
-        8 |
-        524288 |
-        4;
+    var declarationEmitNodeBuilderFlags = 1024 /* MultilineObjectLiterals */ |
+        2048 /* WriteClassExpressionAsTypeLiteral */ |
+        4096 /* UseTypeOfFunction */ |
+        8 /* UseStructuralFallback */ |
+        524288 /* AllowEmptyTuple */ |
+        4 /* GenerateNamesForShadowedTypeParams */;
+    /**
+     * Transforms a ts file into a .d.ts file
+     * This process requires type information, which is retrieved through the emit resolver. Because of this,
+     * in many places this transformer assumes it will be operating on parse tree nodes directly.
+     * This means that _no transforms should be allowed to occur before this one_.
+     */
     function transformDeclarations(context) {
         var throwDiagnostic = function () { return ts.Debug.fail("Diagnostic emitted without context"); };
         var getSymbolAccessibilityDiagnostic = throwDiagnostic;
@@ -59627,8 +74856,8 @@ var ts;
                 return;
             }
             necessaryTypeRefernces = necessaryTypeRefernces || ts.createMap();
-            for (var _i = 0, typeReferenceDirectives_2 = typeReferenceDirectives; _i < typeReferenceDirectives_2.length; _i++) {
-                var ref = typeReferenceDirectives_2[_i];
+            for (var _i = 0, typeReferenceDirectives_1 = typeReferenceDirectives; _i < typeReferenceDirectives_1.length; _i++) {
+                var ref = typeReferenceDirectives_1[_i];
                 necessaryTypeRefernces.set(ref, true);
             }
         }
@@ -59637,7 +74866,8 @@ var ts;
             refs.set("" + ts.getOriginalNodeId(container), container);
         }
         function handleSymbolAccessibilityError(symbolAccessibilityResult) {
-            if (symbolAccessibilityResult.accessibility === 0) {
+            if (symbolAccessibilityResult.accessibility === 0 /* Accessible */) {
+                // Add aliases back onto the possible imports list if they're not there so we can try them again with updated visibility info
                 if (symbolAccessibilityResult && symbolAccessibilityResult.aliasesToMakeVisible) {
                     if (!lateMarkedStatements) {
                         lateMarkedStatements = symbolAccessibilityResult.aliasesToMakeVisible;
@@ -59649,8 +74879,10 @@ var ts;
                         }
                     }
                 }
+                // TODO: Do all these accessibility checks inside/after the first pass in the checker when declarations are enabled, if possible
             }
             else {
+                // Report error
                 var errorInfo = getSymbolAccessibilityDiagnostic(symbolAccessibilityResult);
                 if (errorInfo) {
                     if (errorInfo.typeName) {
@@ -59663,9 +74895,9 @@ var ts;
             }
         }
         function trackSymbol(symbol, enclosingDeclaration, meaning) {
-            if (symbol.flags & 262144)
+            if (symbol.flags & 262144 /* TypeParameter */)
                 return;
-            handleSymbolAccessibilityError(resolver.isSymbolAccessible(symbol, enclosingDeclaration, meaning, true));
+            handleSymbolAccessibilityError(resolver.isSymbolAccessible(symbol, enclosingDeclaration, meaning, /*shouldComputeAliasesToMakeVisible*/ true));
             recordTypeReferenceDirectivesIfNecessary(resolver.getTypeReferenceDirectivesForSymbol(symbol, meaning));
         }
         function reportPrivateInBaseOfClassExpression(propertyName) {
@@ -59684,16 +74916,16 @@ var ts;
             }
         }
         function transformRoot(node) {
-            if (node.kind === 274 && (node.isDeclarationFile || ts.isSourceFileJavaScript(node))) {
+            if (node.kind === 274 /* SourceFile */ && (node.isDeclarationFile || ts.isSourceFileJavaScript(node))) {
                 return node;
             }
-            if (node.kind === 275) {
+            if (node.kind === 275 /* Bundle */) {
                 isBundledEmit = true;
                 var refs_1 = ts.createMap();
                 var hasNoDefaultLib_1 = false;
                 var bundle = ts.createBundle(ts.map(node.sourceFiles, function (sourceFile) {
                     if (sourceFile.isDeclarationFile || ts.isSourceFileJavaScript(sourceFile))
-                        return undefined;
+                        return undefined; // Omit declaration files from bundle results, too // TODO: GH#18217
                     hasNoDefaultLib_1 = hasNoDefaultLib_1 || sourceFile.hasNoDefaultLib;
                     currentSourceFile = sourceFile;
                     enclosingDeclaration = sourceFile;
@@ -59705,28 +74937,29 @@ var ts;
                     resultHasScopeMarker = false;
                     collectReferences(sourceFile, refs_1);
                     if (ts.isExternalModule(sourceFile)) {
-                        resultHasExternalModuleIndicator = false;
+                        resultHasExternalModuleIndicator = false; // unused in external module bundle emit (all external modules are within module blocks, therefore are known to be modules)
                         needsDeclare = false;
                         var statements_5 = ts.visitNodes(sourceFile.statements, visitDeclarationStatements);
-                        var newFile = ts.updateSourceFileNode(sourceFile, [ts.createModuleDeclaration([], [ts.createModifier(124)], ts.createLiteral(ts.getResolvedExternalModuleName(context.getEmitHost(), sourceFile)), ts.createModuleBlock(ts.setTextRange(ts.createNodeArray(transformAndReplaceLatePaintedStatements(statements_5)), sourceFile.statements)))], true, [], [], false);
+                        var newFile = ts.updateSourceFileNode(sourceFile, [ts.createModuleDeclaration([], [ts.createModifier(124 /* DeclareKeyword */)], ts.createLiteral(ts.getResolvedExternalModuleName(context.getEmitHost(), sourceFile)), ts.createModuleBlock(ts.setTextRange(ts.createNodeArray(transformAndReplaceLatePaintedStatements(statements_5)), sourceFile.statements)))], /*isDeclarationFile*/ true, /*referencedFiles*/ [], /*typeReferences*/ [], /*hasNoDefaultLib*/ false, /*libReferences*/ []);
                         return newFile;
                     }
                     needsDeclare = true;
                     var updated = ts.visitNodes(sourceFile.statements, visitDeclarationStatements);
-                    return ts.updateSourceFileNode(sourceFile, transformAndReplaceLatePaintedStatements(updated), true, [], [], false);
+                    return ts.updateSourceFileNode(sourceFile, transformAndReplaceLatePaintedStatements(updated), /*isDeclarationFile*/ true, /*referencedFiles*/ [], /*typeReferences*/ [], /*hasNoDefaultLib*/ false, /*libReferences*/ []);
                 }), ts.mapDefined(node.prepends, function (prepend) {
-                    if (prepend.kind === 277) {
-                        return ts.createUnparsedSourceFile(prepend.declarationText);
+                    if (prepend.kind === 277 /* InputFiles */) {
+                        return ts.createUnparsedSourceFile(prepend.declarationText, prepend.declarationMapText);
                     }
                 }));
                 bundle.syntheticFileReferences = [];
                 bundle.syntheticTypeReferences = getFileReferencesForUsedTypeReferences();
                 bundle.hasNoDefaultLib = hasNoDefaultLib_1;
-                var outputFilePath_1 = ts.getDirectoryPath(ts.normalizeSlashes(ts.getOutputPathsFor(node, host, true).declarationFilePath));
+                var outputFilePath_1 = ts.getDirectoryPath(ts.normalizeSlashes(ts.getOutputPathsFor(node, host, /*forceDtsPaths*/ true).declarationFilePath));
                 var referenceVisitor_1 = mapReferencesIntoArray(bundle.syntheticFileReferences, outputFilePath_1);
                 refs_1.forEach(referenceVisitor_1);
                 return bundle;
             }
+            // Single source file
             needsDeclare = true;
             needsScopeFixMarker = false;
             resultHasScopeMarker = false;
@@ -59741,21 +74974,22 @@ var ts;
             necessaryTypeRefernces = undefined;
             refs = collectReferences(currentSourceFile, ts.createMap());
             var references = [];
-            var outputFilePath = ts.getDirectoryPath(ts.normalizeSlashes(ts.getOutputPathsFor(node, host, true).declarationFilePath));
+            var outputFilePath = ts.getDirectoryPath(ts.normalizeSlashes(ts.getOutputPathsFor(node, host, /*forceDtsPaths*/ true).declarationFilePath));
             var referenceVisitor = mapReferencesIntoArray(references, outputFilePath);
             var statements = ts.visitNodes(node.statements, visitDeclarationStatements);
             var combinedStatements = ts.setTextRange(ts.createNodeArray(transformAndReplaceLatePaintedStatements(statements)), node.statements);
             refs.forEach(referenceVisitor);
             var emittedImports = ts.filter(combinedStatements, ts.isAnyImportSyntax);
             if (ts.isExternalModule(node) && (!resultHasExternalModuleIndicator || (needsScopeFixMarker && !resultHasScopeMarker))) {
-                combinedStatements = ts.setTextRange(ts.createNodeArray(combinedStatements.concat([ts.createExportDeclaration(undefined, undefined, ts.createNamedExports([]), undefined)])), combinedStatements);
+                combinedStatements = ts.setTextRange(ts.createNodeArray(combinedStatements.concat([ts.createExportDeclaration(/*decorators*/ undefined, /*modifiers*/ undefined, ts.createNamedExports([]), /*moduleSpecifier*/ undefined)])), combinedStatements);
             }
-            var updated = ts.updateSourceFileNode(node, combinedStatements, true, references, getFileReferencesForUsedTypeReferences(), node.hasNoDefaultLib);
+            var updated = ts.updateSourceFileNode(node, combinedStatements, /*isDeclarationFile*/ true, references, getFileReferencesForUsedTypeReferences(), node.hasNoDefaultLib);
             return updated;
             function getFileReferencesForUsedTypeReferences() {
                 return necessaryTypeRefernces ? ts.mapDefined(ts.arrayFrom(necessaryTypeRefernces.keys()), getFileReferenceForTypeName) : [];
             }
             function getFileReferenceForTypeName(typeName) {
+                // Elide type references for which we have imports
                 if (emittedImports) {
                     for (var _i = 0, emittedImports_1 = emittedImports; _i < emittedImports_1.length; _i++) {
                         var importStatement = emittedImports_1[_i];
@@ -59775,17 +75009,18 @@ var ts;
             function mapReferencesIntoArray(references, outputFilePath) {
                 return function (file) {
                     var declFileName;
-                    if (file.isDeclarationFile) {
+                    if (file.isDeclarationFile) { // Neither decl files or js should have their refs changed
                         declFileName = file.fileName;
                     }
                     else {
                         if (isBundledEmit && ts.contains(node.sourceFiles, file))
-                            return;
-                        var paths = ts.getOutputPathsFor(file, host, true);
+                            return; // Omit references to files which are being merged
+                        var paths = ts.getOutputPathsFor(file, host, /*forceDtsPaths*/ true);
                         declFileName = paths.declarationFilePath || paths.jsFilePath;
                     }
                     if (declFileName) {
-                        var fileName = ts.getRelativePathToDirectoryOrUrl(outputFilePath, declFileName, host.getCurrentDirectory(), host.getCanonicalFileName, false);
+                        var fileName = ts.getRelativePathToDirectoryOrUrl(outputFilePath, declFileName, host.getCurrentDirectory(), host.getCanonicalFileName, 
+                        /*isAbsolutePathAnUrl*/ false);
                         if (ts.startsWith(fileName, "./") && ts.hasExtension(fileName)) {
                             fileName = fileName.substring(2);
                         }
@@ -59806,11 +75041,11 @@ var ts;
             return ret;
         }
         function filterBindingPatternInitializers(name) {
-            if (name.kind === 71) {
+            if (name.kind === 71 /* Identifier */) {
                 return name;
             }
             else {
-                if (name.kind === 181) {
+                if (name.kind === 181 /* ArrayBindingPattern */) {
                     return ts.updateArrayBindingPattern(name, ts.visitNodes(name.elements, visitBindingElement));
                 }
                 else {
@@ -59818,7 +75053,7 @@ var ts;
                 }
             }
             function visitBindingElement(elem) {
-                if (elem.kind === 206) {
+                if (elem.kind === 206 /* OmittedExpression */) {
                     return elem;
                 }
                 return ts.updateBindingElement(elem, elem.dotDotDotToken, elem.propertyName, filterBindingPatternInitializers(elem.name), shouldPrintWithInitializer(elem) ? elem.initializer : undefined);
@@ -59830,39 +75065,45 @@ var ts;
                 oldDiag = getSymbolAccessibilityDiagnostic;
                 getSymbolAccessibilityDiagnostic = ts.createGetSymbolAccessibilityDiagnosticForNode(p);
             }
-            var newParam = ts.updateParameter(p, undefined, maskModifiers(p, modifierMask), p.dotDotDotToken, filterBindingPatternInitializers(p.name), resolver.isOptionalParameter(p) ? (p.questionToken || ts.createToken(55)) : undefined, ensureType(p, p.type, true), ensureNoInitializer(p));
+            var newParam = ts.updateParameter(p, 
+            /*decorators*/ undefined, maskModifiers(p, modifierMask), p.dotDotDotToken, filterBindingPatternInitializers(p.name), resolver.isOptionalParameter(p) ? (p.questionToken || ts.createToken(55 /* QuestionToken */)) : undefined, ensureType(p, p.type, /*ignorePrivate*/ true), // Ignore private param props, since this type is going straight back into a param
+            ensureNoInitializer(p));
             if (!suppressNewDiagnosticContexts) {
                 getSymbolAccessibilityDiagnostic = oldDiag;
             }
             return newParam;
         }
         function shouldPrintWithInitializer(node) {
-            return canHaveLiteralInitializer(node) && resolver.isLiteralConstDeclaration(ts.getParseTreeNode(node));
+            return canHaveLiteralInitializer(node) && resolver.isLiteralConstDeclaration(ts.getParseTreeNode(node)); // TODO: Make safe
         }
         function ensureNoInitializer(node) {
             if (shouldPrintWithInitializer(node)) {
-                return resolver.createLiteralConstValue(ts.getParseTreeNode(node));
+                return resolver.createLiteralConstValue(ts.getParseTreeNode(node)); // TODO: Make safe
             }
             return undefined;
         }
         function ensureType(node, type, ignorePrivate) {
-            if (!ignorePrivate && ts.hasModifier(node, 8)) {
+            if (!ignorePrivate && ts.hasModifier(node, 8 /* Private */)) {
+                // Private nodes emit no types (except private parameter properties, whose parameter types are actually visible)
                 return;
             }
             if (shouldPrintWithInitializer(node)) {
+                // Literal const declarations will have an initializer ensured rather than a type
                 return;
             }
-            var shouldUseResolverType = node.kind === 149 &&
+            var shouldUseResolverType = node.kind === 149 /* Parameter */ &&
                 (resolver.isRequiredInitializedParameter(node) ||
                     resolver.isOptionalUninitializedParameterProperty(node));
             if (type && !shouldUseResolverType) {
                 return ts.visitNode(type, visitDeclarationSubtree);
             }
             if (!ts.getParseTreeNode(node)) {
-                return type ? ts.visitNode(type, visitDeclarationSubtree) : ts.createKeywordTypeNode(119);
+                return type ? ts.visitNode(type, visitDeclarationSubtree) : ts.createKeywordTypeNode(119 /* AnyKeyword */);
             }
-            if (node.kind === 157) {
-                return ts.createKeywordTypeNode(119);
+            if (node.kind === 157 /* SetAccessor */) {
+                // Set accessors with no associated type node (from it's param or get accessor return) are `any` since they are never contextually typed right now
+                // (The inferred type here will be void, but the old declaration emitter printed `any`, so this replicates that)
+                return ts.createKeywordTypeNode(119 /* AnyKeyword */);
             }
             errorNameNode = node.name;
             var oldDiag;
@@ -59870,12 +75111,12 @@ var ts;
                 oldDiag = getSymbolAccessibilityDiagnostic;
                 getSymbolAccessibilityDiagnostic = ts.createGetSymbolAccessibilityDiagnosticForNode(node);
             }
-            if (node.kind === 232 || node.kind === 182) {
+            if (node.kind === 232 /* VariableDeclaration */ || node.kind === 182 /* BindingElement */) {
                 return cleanup(resolver.createTypeOfDeclaration(node, enclosingDeclaration, declarationEmitNodeBuilderFlags, symbolTracker));
             }
-            if (node.kind === 149
-                || node.kind === 152
-                || node.kind === 151) {
+            if (node.kind === 149 /* Parameter */
+                || node.kind === 152 /* PropertyDeclaration */
+                || node.kind === 151 /* PropertySignature */) {
                 if (!node.initializer)
                     return cleanup(resolver.createTypeOfDeclaration(node, enclosingDeclaration, declarationEmitNodeBuilderFlags, symbolTracker, shouldUseResolverType));
                 return cleanup(resolver.createTypeOfDeclaration(node, enclosingDeclaration, declarationEmitNodeBuilderFlags, symbolTracker, shouldUseResolverType) || resolver.createTypeOfExpression(node.initializer, enclosingDeclaration, declarationEmitNodeBuilderFlags, symbolTracker));
@@ -59886,25 +75127,26 @@ var ts;
                 if (!suppressNewDiagnosticContexts) {
                     getSymbolAccessibilityDiagnostic = oldDiag;
                 }
-                return returnValue || ts.createKeywordTypeNode(119);
+                return returnValue || ts.createKeywordTypeNode(119 /* AnyKeyword */);
             }
         }
         function isDeclarationAndNotVisible(node) {
             node = ts.getParseTreeNode(node);
             switch (node.kind) {
-                case 234:
-                case 239:
-                case 236:
-                case 235:
-                case 237:
-                case 238:
+                case 234 /* FunctionDeclaration */:
+                case 239 /* ModuleDeclaration */:
+                case 236 /* InterfaceDeclaration */:
+                case 235 /* ClassDeclaration */:
+                case 237 /* TypeAliasDeclaration */:
+                case 238 /* EnumDeclaration */:
                     return !resolver.isDeclarationVisible(node);
-                case 232:
+                // The following should be doing their own visibility checks based on filtering their members
+                case 232 /* VariableDeclaration */:
                     return !getBindingNameVisible(node);
-                case 243:
-                case 244:
-                case 250:
-                case 249:
+                case 243 /* ImportEqualsDeclaration */:
+                case 244 /* ImportDeclaration */:
+                case 250 /* ExportDeclaration */:
+                case 249 /* ExportAssignment */:
                     return false;
             }
             return false;
@@ -59914,6 +75156,7 @@ var ts;
                 return false;
             }
             if (ts.isBindingPattern(elem.name)) {
+                // If any child binding pattern element has been marked visible (usually by collect linked aliases), then this is visible
                 return ts.some(elem.name.elements, getBindingNameVisible);
             }
             else {
@@ -59921,17 +75164,17 @@ var ts;
             }
         }
         function updateParamsList(node, params, modifierMask) {
-            if (ts.hasModifier(node, 8)) {
-                return undefined;
+            if (ts.hasModifier(node, 8 /* Private */)) {
+                return undefined; // TODO: GH#18217
             }
             var newParams = ts.map(params, function (p) { return ensureParameter(p, modifierMask); });
             if (!newParams) {
-                return undefined;
+                return undefined; // TODO: GH#18217
             }
             return ts.createNodeArray(newParams, params.hasTrailingComma);
         }
         function ensureTypeParams(node, params) {
-            return ts.hasModifier(node, 8) ? undefined : ts.visitNodes(params, visitDeclarationSubtree);
+            return ts.hasModifier(node, 8 /* Private */) ? undefined : ts.visitNodes(params, visitDeclarationSubtree);
         }
         function isEnclosingDeclaration(node) {
             return ts.isSourceFile(node)
@@ -59956,9 +75199,9 @@ var ts;
         }
         function rewriteModuleSpecifier(parent, input) {
             if (!input)
-                return undefined;
-            resultHasExternalModuleIndicator = resultHasExternalModuleIndicator || (parent.kind !== 239 && parent.kind !== 179);
-            if (input.kind === 9 && isBundledEmit) {
+                return undefined; // TODO: GH#18217
+            resultHasExternalModuleIndicator = resultHasExternalModuleIndicator || (parent.kind !== 239 /* ModuleDeclaration */ && parent.kind !== 179 /* ImportType */);
+            if (input.kind === 9 /* StringLiteral */ && isBundledEmit) {
                 var newName = ts.getExternalModuleNameFromDeclaration(context.getEmitHost(), resolver, parent);
                 if (newName) {
                     return ts.createLiteral(newName);
@@ -59969,9 +75212,11 @@ var ts;
         function transformImportEqualsDeclaration(decl) {
             if (!resolver.isDeclarationVisible(decl))
                 return;
-            if (decl.moduleReference.kind === 254) {
+            if (decl.moduleReference.kind === 254 /* ExternalModuleReference */) {
+                // Rewrite external module names if necessary
                 var specifier = ts.getExternalModuleImportEqualsDeclarationExpression(decl);
-                return ts.updateImportEqualsDeclaration(decl, undefined, decl.modifiers, decl.name, ts.updateExternalModuleReference(decl.moduleReference, rewriteModuleSpecifier(decl, specifier)));
+                return ts.updateImportEqualsDeclaration(decl, 
+                /*decorators*/ undefined, decl.modifiers, decl.name, ts.updateExternalModuleReference(decl.moduleReference, rewriteModuleSpecifier(decl, specifier)));
             }
             else {
                 var oldDiag = getSymbolAccessibilityDiagnostic;
@@ -59983,30 +75228,55 @@ var ts;
         }
         function transformImportDeclaration(decl) {
             if (!decl.importClause) {
-                return ts.updateImportDeclaration(decl, undefined, decl.modifiers, decl.importClause, rewriteModuleSpecifier(decl, decl.moduleSpecifier));
+                // import "mod" - possibly needed for side effects? (global interface patches, module augmentations, etc)
+                return ts.updateImportDeclaration(decl, 
+                /*decorators*/ undefined, decl.modifiers, decl.importClause, rewriteModuleSpecifier(decl, decl.moduleSpecifier));
             }
+            // The `importClause` visibility corresponds to the default's visibility.
             var visibleDefaultBinding = decl.importClause && decl.importClause.name && resolver.isDeclarationVisible(decl.importClause) ? decl.importClause.name : undefined;
             if (!decl.importClause.namedBindings) {
-                return visibleDefaultBinding && ts.updateImportDeclaration(decl, undefined, decl.modifiers, ts.updateImportClause(decl.importClause, visibleDefaultBinding, undefined), rewriteModuleSpecifier(decl, decl.moduleSpecifier));
+                // No named bindings (either namespace or list), meaning the import is just default or should be elided
+                return visibleDefaultBinding && ts.updateImportDeclaration(decl, /*decorators*/ undefined, decl.modifiers, ts.updateImportClause(decl.importClause, visibleDefaultBinding, 
+                /*namedBindings*/ undefined), rewriteModuleSpecifier(decl, decl.moduleSpecifier));
             }
-            if (decl.importClause.namedBindings.kind === 246) {
-                var namedBindings = resolver.isDeclarationVisible(decl.importClause.namedBindings) ? decl.importClause.namedBindings : undefined;
-                return visibleDefaultBinding || namedBindings ? ts.updateImportDeclaration(decl, undefined, decl.modifiers, ts.updateImportClause(decl.importClause, visibleDefaultBinding, namedBindings), rewriteModuleSpecifier(decl, decl.moduleSpecifier)) : undefined;
+            if (decl.importClause.namedBindings.kind === 246 /* NamespaceImport */) {
+                // Namespace import (optionally with visible default)
+                var namedBindings = resolver.isDeclarationVisible(decl.importClause.namedBindings) ? decl.importClause.namedBindings : /*namedBindings*/ undefined;
+                return visibleDefaultBinding || namedBindings ? ts.updateImportDeclaration(decl, /*decorators*/ undefined, decl.modifiers, ts.updateImportClause(decl.importClause, visibleDefaultBinding, namedBindings), rewriteModuleSpecifier(decl, decl.moduleSpecifier)) : undefined;
             }
+            // Named imports (optionally with visible default)
             var bindingList = ts.mapDefined(decl.importClause.namedBindings.elements, function (b) { return resolver.isDeclarationVisible(b) ? b : undefined; });
             if ((bindingList && bindingList.length) || visibleDefaultBinding) {
-                return ts.updateImportDeclaration(decl, undefined, decl.modifiers, ts.updateImportClause(decl.importClause, visibleDefaultBinding, bindingList && bindingList.length ? ts.updateNamedImports(decl.importClause.namedBindings, bindingList) : undefined), rewriteModuleSpecifier(decl, decl.moduleSpecifier));
+                return ts.updateImportDeclaration(decl, 
+                /*decorators*/ undefined, decl.modifiers, ts.updateImportClause(decl.importClause, visibleDefaultBinding, bindingList && bindingList.length ? ts.updateNamedImports(decl.importClause.namedBindings, bindingList) : undefined), rewriteModuleSpecifier(decl, decl.moduleSpecifier));
             }
+            // Nothing visible
         }
         function transformAndReplaceLatePaintedStatements(statements) {
+            // This is a `while` loop because `handleSymbolAccessibilityError` can see additional import aliases marked as visible during
+            // error handling which must now be included in the output and themselves checked for errors.
+            // For example:
+            // ```
+            // module A {
+            //   export module Q {}
+            //   import B = Q;
+            //   import C = B;
+            //   export import D = C;
+            // }
+            // ```
+            // In such a scenario, only Q and D are initially visible, but we don't consider imports as private names - instead we say they if they are referenced they must
+            // be recorded. So while checking D's visibility we mark C as visible, then we must check C which in turn marks B, completing the chain of
+            // dependent imports and allowing a valid declaration file output. Today, this dependent alias marking only happens for internal import aliases.
             while (ts.length(lateMarkedStatements)) {
                 var i = lateMarkedStatements.shift();
                 if (!ts.isLateVisibilityPaintedStatement(i)) {
                     return ts.Debug.fail("Late replaced statement was found which is not handled by the declaration transformer!: " + (ts.SyntaxKind ? ts.SyntaxKind[i.kind] : i.kind));
                 }
-                var result = transformTopLevelDeclaration(i, true);
+                var result = transformTopLevelDeclaration(i, /*privateDeclaration*/ true);
                 lateStatementReplacementMap.set("" + ts.getOriginalNodeId(i), result);
             }
+            // And lastly, we need to get the final form of all those indetermine import declarations from before and add them to the output list
+            // (and remove them from the set to examine for outter declarations)
             return ts.visitNodes(statements, visitLateVisibilityMarkedStatements);
             function visitLateVisibilityMarkedStatements(statement) {
                 if (ts.isLateVisibilityPaintedStatement(statement)) {
@@ -60016,6 +75286,7 @@ var ts;
                         lateStatementReplacementMap.delete(key);
                         if (result && ts.isSourceFile(statement.parent)) {
                             if (ts.isArray(result) ? ts.some(result, needsScopeMarker) : needsScopeMarker(result)) {
+                                // Top-level declarations in .d.ts files are always considered exported even without a modifier unless there's an export assignment or specifier
                                 needsScopeFixMarker = true;
                             }
                             if (ts.isArray(result) ? ts.some(result, isExternalModuleIndicator) : isExternalModuleIndicator(result)) {
@@ -60029,10 +75300,11 @@ var ts;
             }
         }
         function isExternalModuleIndicator(result) {
-            return ts.isAnyImportOrReExport(result) || ts.isExportAssignment(result) || ts.hasModifier(result, 1);
+            // Exported top-level member indicates moduleness
+            return ts.isAnyImportOrReExport(result) || ts.isExportAssignment(result) || ts.hasModifier(result, 1 /* Export */);
         }
         function needsScopeMarker(result) {
-            return !ts.isAnyImportOrReExport(result) && !ts.isExportAssignment(result) && !ts.hasModifier(result, 1) && !ts.isAmbientModule(result);
+            return !ts.isAnyImportOrReExport(result) && !ts.isExportAssignment(result) && !ts.hasModifier(result, 1 /* Export */) && !ts.isAmbientModule(result);
         }
         function visitDeclarationSubtree(input) {
             if (shouldStripInternal(input))
@@ -60044,8 +75316,10 @@ var ts;
                     return;
                 }
             }
+            // Elide implementation signatures from overload sets
             if (ts.isFunctionLike(input) && resolver.isImplementationOfOverload(input))
                 return;
+            // Elide semicolon class statements
             if (ts.isSemicolonClassElement(input))
                 return;
             var previousEnclosingDeclaration;
@@ -60054,11 +75328,12 @@ var ts;
                 enclosingDeclaration = input;
             }
             var oldDiag = getSymbolAccessibilityDiagnostic;
+            // Emit methods which are private as properties with no type information
             if (ts.isMethodDeclaration(input) || ts.isMethodSignature(input)) {
-                if (ts.hasModifier(input, 8)) {
+                if (ts.hasModifier(input, 8 /* Private */)) {
                     if (input.symbol && input.symbol.declarations && input.symbol.declarations[0] !== input)
-                        return;
-                    return cleanup(ts.createProperty(undefined, ensureModifiers(input), input.name, undefined, undefined, undefined));
+                        return; // Elide all but the first overload
+                    return cleanup(ts.createProperty(/*decorators*/ undefined, ensureModifiers(input), input.name, /*questionToken*/ undefined, /*type*/ undefined, /*initializer*/ undefined));
                 }
             }
             var canProdiceDiagnostic = ts.canProduceDiagnostics(input);
@@ -60069,75 +75344,84 @@ var ts;
                 checkEntityNameVisibility(input.exprName, enclosingDeclaration);
             }
             var oldWithinObjectLiteralType = suppressNewDiagnosticContexts;
-            var shouldEnterSuppressNewDiagnosticsContextContext = ((input.kind === 166 || input.kind === 177) && input.parent.kind !== 237);
+            var shouldEnterSuppressNewDiagnosticsContextContext = ((input.kind === 166 /* TypeLiteral */ || input.kind === 177 /* MappedType */) && input.parent.kind !== 237 /* TypeAliasDeclaration */);
             if (shouldEnterSuppressNewDiagnosticsContextContext) {
+                // We stop making new diagnostic contexts within object literal types. Unless it's an object type on the RHS of a type alias declaration. Then we do.
                 suppressNewDiagnosticContexts = true;
             }
             if (isProcessedComponent(input)) {
                 switch (input.kind) {
-                    case 207: {
+                    case 207 /* ExpressionWithTypeArguments */: {
                         if ((ts.isEntityName(input.expression) || ts.isEntityNameExpression(input.expression))) {
                             checkEntityNameVisibility(input.expression, enclosingDeclaration);
                         }
                         var node = ts.visitEachChild(input, visitDeclarationSubtree, context);
                         return cleanup(ts.updateExpressionWithTypeArguments(node, ts.parenthesizeTypeParameters(node.typeArguments), node.expression));
                     }
-                    case 162: {
+                    case 162 /* TypeReference */: {
                         checkEntityNameVisibility(input.typeName, enclosingDeclaration);
                         var node = ts.visitEachChild(input, visitDeclarationSubtree, context);
                         return cleanup(ts.updateTypeReferenceNode(node, node.typeName, ts.parenthesizeTypeParameters(node.typeArguments)));
                     }
-                    case 159:
+                    case 159 /* ConstructSignature */:
                         return cleanup(ts.updateConstructSignature(input, ensureTypeParams(input, input.typeParameters), updateParamsList(input, input.parameters), ensureType(input, input.type)));
-                    case 155: {
-                        var isPrivate = ts.hasModifier(input, 8);
-                        var ctor = ts.createSignatureDeclaration(155, isPrivate ? undefined : ensureTypeParams(input, input.typeParameters), isPrivate ? undefined : updateParamsList(input, input.parameters, 0), undefined);
+                    case 155 /* Constructor */: {
+                        var isPrivate = ts.hasModifier(input, 8 /* Private */);
+                        // A constructor declaration may not have a type annotation
+                        var ctor = ts.createSignatureDeclaration(155 /* Constructor */, isPrivate ? undefined : ensureTypeParams(input, input.typeParameters), 
+                        // TODO: GH#18217
+                        isPrivate ? undefined : updateParamsList(input, input.parameters, 0 /* None */), 
+                        /*type*/ undefined);
                         ctor.modifiers = ts.createNodeArray(ensureModifiers(input));
                         return cleanup(ctor);
                     }
-                    case 154: {
-                        var sig = ts.createSignatureDeclaration(153, ensureTypeParams(input, input.typeParameters), updateParamsList(input, input.parameters), ensureType(input, input.type));
+                    case 154 /* MethodDeclaration */: {
+                        var sig = ts.createSignatureDeclaration(153 /* MethodSignature */, ensureTypeParams(input, input.typeParameters), updateParamsList(input, input.parameters), ensureType(input, input.type));
                         sig.name = input.name;
                         sig.modifiers = ts.createNodeArray(ensureModifiers(input));
                         sig.questionToken = input.questionToken;
                         return cleanup(sig);
                     }
-                    case 156: {
+                    case 156 /* GetAccessor */: {
                         var newNode = ensureAccessor(input);
                         return cleanup(newNode);
                     }
-                    case 157: {
+                    case 157 /* SetAccessor */: {
                         var newNode = ensureAccessor(input);
                         return cleanup(newNode);
                     }
-                    case 152:
-                        return cleanup(ts.updateProperty(input, undefined, ensureModifiers(input), input.name, input.questionToken, !ts.hasModifier(input, 8) ? ensureType(input, input.type) : undefined, ensureNoInitializer(input)));
-                    case 151:
-                        return cleanup(ts.updatePropertySignature(input, ensureModifiers(input), input.name, input.questionToken, !ts.hasModifier(input, 8) ? ensureType(input, input.type) : undefined, ensureNoInitializer(input)));
-                    case 153: {
+                    case 152 /* PropertyDeclaration */:
+                        return cleanup(ts.updateProperty(input, 
+                        /*decorators*/ undefined, ensureModifiers(input), input.name, input.questionToken, !ts.hasModifier(input, 8 /* Private */) ? ensureType(input, input.type) : undefined, ensureNoInitializer(input)));
+                    case 151 /* PropertySignature */:
+                        return cleanup(ts.updatePropertySignature(input, ensureModifiers(input), input.name, input.questionToken, !ts.hasModifier(input, 8 /* Private */) ? ensureType(input, input.type) : undefined, ensureNoInitializer(input)));
+                    case 153 /* MethodSignature */: {
                         return cleanup(ts.updateMethodSignature(input, ensureTypeParams(input, input.typeParameters), updateParamsList(input, input.parameters), ensureType(input, input.type), input.name, input.questionToken));
                     }
-                    case 158: {
+                    case 158 /* CallSignature */: {
                         return cleanup(ts.updateCallSignature(input, ensureTypeParams(input, input.typeParameters), updateParamsList(input, input.parameters), ensureType(input, input.type)));
                     }
-                    case 160: {
-                        return cleanup(ts.updateIndexSignature(input, undefined, ensureModifiers(input), updateParamsList(input, input.parameters), ts.visitNode(input.type, visitDeclarationSubtree) || ts.createKeywordTypeNode(119)));
+                    case 160 /* IndexSignature */: {
+                        return cleanup(ts.updateIndexSignature(input, 
+                        /*decorators*/ undefined, ensureModifiers(input), updateParamsList(input, input.parameters), ts.visitNode(input.type, visitDeclarationSubtree) || ts.createKeywordTypeNode(119 /* AnyKeyword */)));
                     }
-                    case 232: {
+                    case 232 /* VariableDeclaration */: {
                         if (ts.isBindingPattern(input.name)) {
                             return recreateBindingPattern(input.name);
                         }
                         shouldEnterSuppressNewDiagnosticsContextContext = true;
-                        suppressNewDiagnosticContexts = true;
+                        suppressNewDiagnosticContexts = true; // Variable declaration types also suppress new diagnostic contexts, provided the contexts wouldn't be made for binding pattern types
                         return cleanup(ts.updateVariableDeclaration(input, input.name, ensureType(input, input.type), ensureNoInitializer(input)));
                     }
-                    case 148: {
+                    case 148 /* TypeParameter */: {
                         if (isPrivateMethodTypeParameter(input) && (input.default || input.constraint)) {
-                            return cleanup(ts.updateTypeParameterDeclaration(input, input.name, undefined, undefined));
+                            return cleanup(ts.updateTypeParameterDeclaration(input, input.name, /*constraint*/ undefined, /*defaultType*/ undefined));
                         }
                         return cleanup(ts.visitEachChild(input, visitDeclarationSubtree, context));
                     }
-                    case 171: {
+                    case 171 /* ConditionalType */: {
+                        // We have to process conditional types in a special way because for visibility purposes we need to push a new enclosingDeclaration
+                        // just for the `infer` types in the true branch. It's an implicit declaration scope that only applies to _part_ of the type.
                         var checkType = ts.visitNode(input.checkType, visitDeclarationSubtree);
                         var extendsType = ts.visitNode(input.extendsType, visitDeclarationSubtree);
                         var oldEnclosingDecl = enclosingDeclaration;
@@ -60147,13 +75431,13 @@ var ts;
                         var falseType = ts.visitNode(input.falseType, visitDeclarationSubtree);
                         return cleanup(ts.updateConditionalTypeNode(input, checkType, extendsType, trueType, falseType));
                     }
-                    case 163: {
+                    case 163 /* FunctionType */: {
                         return cleanup(ts.updateFunctionTypeNode(input, ts.visitNodes(input.typeParameters, visitDeclarationSubtree), updateParamsList(input, input.parameters), ts.visitNode(input.type, visitDeclarationSubtree)));
                     }
-                    case 164: {
+                    case 164 /* ConstructorType */: {
                         return cleanup(ts.updateConstructorTypeNode(input, ts.visitNodes(input.typeParameters, visitDeclarationSubtree), updateParamsList(input, input.parameters), ts.visitNode(input.type, visitDeclarationSubtree)));
                     }
-                    case 179: {
+                    case 179 /* ImportType */: {
                         if (!ts.isLiteralImportTypeNode(input))
                             return cleanup(input);
                         return cleanup(ts.updateImportTypeNode(input, ts.updateLiteralTypeNode(input.argument, rewriteModuleSpecifier(input, input.argument.literal)), input.qualifier, ts.visitNodes(input.typeArguments, visitDeclarationSubtree, ts.isTypeNode), input.isTypeOf));
@@ -60182,28 +75466,32 @@ var ts;
             }
         }
         function isPrivateMethodTypeParameter(node) {
-            return node.parent.kind === 154 && ts.hasModifier(node.parent, 8);
+            return node.parent.kind === 154 /* MethodDeclaration */ && ts.hasModifier(node.parent, 8 /* Private */);
         }
         function visitDeclarationStatements(input) {
             if (!isPreservedDeclarationStatement(input)) {
+                // return undefined for unmatched kinds to omit them from the tree
                 return;
             }
             if (shouldStripInternal(input))
                 return;
             switch (input.kind) {
-                case 250: {
+                case 250 /* ExportDeclaration */: {
                     if (ts.isSourceFile(input.parent)) {
                         resultHasExternalModuleIndicator = true;
                         resultHasScopeMarker = true;
                     }
-                    return ts.updateExportDeclaration(input, undefined, input.modifiers, input.exportClause, rewriteModuleSpecifier(input, input.moduleSpecifier));
+                    // Always visible if the parent node isn't dropped for being not visible
+                    // Rewrite external module names if necessary
+                    return ts.updateExportDeclaration(input, /*decorators*/ undefined, input.modifiers, input.exportClause, rewriteModuleSpecifier(input, input.moduleSpecifier));
                 }
-                case 249: {
+                case 249 /* ExportAssignment */: {
+                    // Always visible if the parent node isn't dropped for being not visible
                     if (ts.isSourceFile(input.parent)) {
                         resultHasExternalModuleIndicator = true;
                         resultHasScopeMarker = true;
                     }
-                    if (input.expression.kind === 71) {
+                    if (input.expression.kind === 71 /* Identifier */) {
                         return input;
                     }
                     else {
@@ -60212,13 +75500,14 @@ var ts;
                             diagnosticMessage: ts.Diagnostics.Default_export_of_the_module_has_or_is_using_private_name_0,
                             errorNode: input
                         }); };
-                        var varDecl = ts.createVariableDeclaration(newId, resolver.createTypeOfExpression(input.expression, input, declarationEmitNodeBuilderFlags, symbolTracker), undefined);
-                        var statement = ts.createVariableStatement(needsDeclare ? [ts.createModifier(124)] : [], ts.createVariableDeclarationList([varDecl], 2));
+                        var varDecl = ts.createVariableDeclaration(newId, resolver.createTypeOfExpression(input.expression, input, declarationEmitNodeBuilderFlags, symbolTracker), /*initializer*/ undefined);
+                        var statement = ts.createVariableStatement(needsDeclare ? [ts.createModifier(124 /* DeclareKeyword */)] : [], ts.createVariableDeclarationList([varDecl], 2 /* Const */));
                         return [statement, ts.updateExportAssignment(input, input.decorators, input.modifiers, newId)];
                     }
                 }
             }
             var result = transformTopLevelDeclaration(input);
+            // Don't actually transform yet; just leave as original node - will be elided/swapped by late pass
             lateStatementReplacementMap.set("" + ts.getOriginalNodeId(input), result);
             return input;
         }
@@ -60226,15 +75515,16 @@ var ts;
             if (shouldStripInternal(input))
                 return;
             switch (input.kind) {
-                case 243: {
+                case 243 /* ImportEqualsDeclaration */: {
                     return transformImportEqualsDeclaration(input);
                 }
-                case 244: {
+                case 244 /* ImportDeclaration */: {
                     return transformImportDeclaration(input);
                 }
             }
             if (ts.isDeclaration(input) && isDeclarationAndNotVisible(input))
                 return;
+            // Elide implementation signatures from overload sets
             if (ts.isFunctionLike(input) && resolver.isImplementationOfOverload(input))
                 return;
             var previousEnclosingDeclaration;
@@ -60249,36 +75539,45 @@ var ts;
             }
             var previousNeedsDeclare = needsDeclare;
             switch (input.kind) {
-                case 237:
-                    return cleanup(ts.updateTypeAliasDeclaration(input, undefined, ensureModifiers(input, isPrivate), input.name, ts.visitNodes(input.typeParameters, visitDeclarationSubtree, ts.isTypeParameterDeclaration), ts.visitNode(input.type, visitDeclarationSubtree, ts.isTypeNode)));
-                case 236: {
-                    return cleanup(ts.updateInterfaceDeclaration(input, undefined, ensureModifiers(input, isPrivate), input.name, ensureTypeParams(input, input.typeParameters), transformHeritageClauses(input.heritageClauses), ts.visitNodes(input.members, visitDeclarationSubtree)));
+                case 237 /* TypeAliasDeclaration */: // Type aliases get `declare`d if need be (for legacy support), but that's all
+                    return cleanup(ts.updateTypeAliasDeclaration(input, 
+                    /*decorators*/ undefined, ensureModifiers(input, isPrivate), input.name, ts.visitNodes(input.typeParameters, visitDeclarationSubtree, ts.isTypeParameterDeclaration), ts.visitNode(input.type, visitDeclarationSubtree, ts.isTypeNode)));
+                case 236 /* InterfaceDeclaration */: {
+                    return cleanup(ts.updateInterfaceDeclaration(input, 
+                    /*decorators*/ undefined, ensureModifiers(input, isPrivate), input.name, ensureTypeParams(input, input.typeParameters), transformHeritageClauses(input.heritageClauses), ts.visitNodes(input.members, visitDeclarationSubtree)));
                 }
-                case 234: {
-                    return cleanup(ts.updateFunctionDeclaration(input, undefined, ensureModifiers(input, isPrivate), undefined, input.name, ensureTypeParams(input, input.typeParameters), updateParamsList(input, input.parameters), ensureType(input, input.type), undefined));
+                case 234 /* FunctionDeclaration */: {
+                    // Generators lose their generator-ness, excepting their return type
+                    return cleanup(ts.updateFunctionDeclaration(input, 
+                    /*decorators*/ undefined, ensureModifiers(input, isPrivate), 
+                    /*asteriskToken*/ undefined, input.name, ensureTypeParams(input, input.typeParameters), updateParamsList(input, input.parameters), ensureType(input, input.type), 
+                    /*body*/ undefined));
                 }
-                case 239: {
+                case 239 /* ModuleDeclaration */: {
                     needsDeclare = false;
                     var inner = input.body;
-                    if (inner && inner.kind === 240) {
+                    if (inner && inner.kind === 240 /* ModuleBlock */) {
                         var statements = ts.visitNodes(inner.statements, visitDeclarationStatements);
                         var body = ts.updateModuleBlock(inner, transformAndReplaceLatePaintedStatements(statements));
                         needsDeclare = previousNeedsDeclare;
                         var mods = ensureModifiers(input, isPrivate);
-                        return cleanup(ts.updateModuleDeclaration(input, undefined, mods, ts.isExternalModuleAugmentation(input) ? rewriteModuleSpecifier(input, input.name) : input.name, body));
+                        return cleanup(ts.updateModuleDeclaration(input, 
+                        /*decorators*/ undefined, mods, ts.isExternalModuleAugmentation(input) ? rewriteModuleSpecifier(input, input.name) : input.name, body));
                     }
                     else {
                         needsDeclare = previousNeedsDeclare;
                         var mods = ensureModifiers(input, isPrivate);
                         needsDeclare = false;
                         ts.visitNode(inner, visitDeclarationStatements);
-                        var id = "" + ts.getOriginalNodeId(inner);
+                        // eagerly transform nested namespaces (the nesting doesn't need any elision or painting done)
+                        var id = "" + ts.getOriginalNodeId(inner); // TODO: GH#18217
                         var body = lateStatementReplacementMap.get(id);
                         lateStatementReplacementMap.delete(id);
-                        return cleanup(ts.updateModuleDeclaration(input, undefined, mods, input.name, body));
+                        return cleanup(ts.updateModuleDeclaration(input, 
+                        /*decorators*/ undefined, mods, input.name, body));
                     }
                 }
-                case 235: {
+                case 235 /* ClassDeclaration */: {
                     var modifiers = ts.createNodeArray(ensureModifiers(input, isPrivate));
                     var typeParameters = ensureTypeParams(input, input.typeParameters);
                     var ctor = ts.getFirstConstructorWithBody(input);
@@ -60286,13 +75585,15 @@ var ts;
                     if (ctor) {
                         var oldDiag_1 = getSymbolAccessibilityDiagnostic;
                         parameterProperties = ts.compact(ts.flatMap(ctor.parameters, function (param) {
-                            if (!ts.hasModifier(param, 92))
+                            if (!ts.hasModifier(param, 92 /* ParameterPropertyModifier */))
                                 return;
                             getSymbolAccessibilityDiagnostic = ts.createGetSymbolAccessibilityDiagnosticForNode(param);
-                            if (param.name.kind === 71) {
-                                return preserveJsDoc(ts.createProperty(undefined, ensureModifiers(param), param.name, param.questionToken, ensureType(param, param.type), ensureNoInitializer(param)), param);
+                            if (param.name.kind === 71 /* Identifier */) {
+                                return preserveJsDoc(ts.createProperty(
+                                /*decorators*/ undefined, ensureModifiers(param), param.name, param.questionToken, ensureType(param, param.type), ensureNoInitializer(param)), param);
                             }
                             else {
+                                // Pattern - this is currently an error, but we emit declarations for it somewhat correctly
                                 return walkBindingPattern(param.name);
                             }
                             function walkBindingPattern(pattern) {
@@ -60305,7 +75606,10 @@ var ts;
                                         elems = ts.concatenate(elems, walkBindingPattern(elem.name));
                                     }
                                     elems = elems || [];
-                                    elems.push(ts.createProperty(undefined, ensureModifiers(param), elem.name, undefined, ensureType(elem, undefined), undefined));
+                                    elems.push(ts.createProperty(
+                                    /*decorators*/ undefined, ensureModifiers(param), elem.name, 
+                                    /*questionToken*/ undefined, ensureType(elem, /*type*/ undefined), 
+                                    /*initializer*/ undefined));
                                 }
                                 return elems;
                             }
@@ -60314,44 +75618,49 @@ var ts;
                     }
                     var members = ts.createNodeArray(ts.concatenate(parameterProperties, ts.visitNodes(input.members, visitDeclarationSubtree)));
                     var extendsClause_1 = ts.getClassExtendsHeritageClauseElement(input);
-                    if (extendsClause_1 && !ts.isEntityNameExpression(extendsClause_1.expression) && extendsClause_1.expression.kind !== 95) {
-                        var newId_1 = ts.createOptimisticUniqueName(ts.unescapeLeadingUnderscores(input.name.escapedText) + "_base");
+                    if (extendsClause_1 && !ts.isEntityNameExpression(extendsClause_1.expression) && extendsClause_1.expression.kind !== 95 /* NullKeyword */) {
+                        // We must add a temporary declaration for the extends clause expression
+                        var newId_1 = ts.createOptimisticUniqueName(ts.unescapeLeadingUnderscores(input.name.escapedText) + "_base"); // TODO: GH#18217
                         getSymbolAccessibilityDiagnostic = function () { return ({
                             diagnosticMessage: ts.Diagnostics.extends_clause_of_exported_class_0_has_or_is_using_private_name_1,
                             errorNode: extendsClause_1,
                             typeName: input.name
                         }); };
-                        var varDecl = ts.createVariableDeclaration(newId_1, resolver.createTypeOfExpression(extendsClause_1.expression, input, declarationEmitNodeBuilderFlags, symbolTracker), undefined);
-                        var statement = ts.createVariableStatement(needsDeclare ? [ts.createModifier(124)] : [], ts.createVariableDeclarationList([varDecl], 2));
+                        var varDecl = ts.createVariableDeclaration(newId_1, resolver.createTypeOfExpression(extendsClause_1.expression, input, declarationEmitNodeBuilderFlags, symbolTracker), /*initializer*/ undefined);
+                        var statement = ts.createVariableStatement(needsDeclare ? [ts.createModifier(124 /* DeclareKeyword */)] : [], ts.createVariableDeclarationList([varDecl], 2 /* Const */));
                         var heritageClauses = ts.createNodeArray(ts.map(input.heritageClauses, function (clause) {
-                            if (clause.token === 85) {
+                            if (clause.token === 85 /* ExtendsKeyword */) {
                                 var oldDiag_2 = getSymbolAccessibilityDiagnostic;
                                 getSymbolAccessibilityDiagnostic = ts.createGetSymbolAccessibilityDiagnosticForNode(clause.types[0]);
                                 var newClause = ts.updateHeritageClause(clause, ts.map(clause.types, function (t) { return ts.updateExpressionWithTypeArguments(t, ts.visitNodes(t.typeArguments, visitDeclarationSubtree), newId_1); }));
                                 getSymbolAccessibilityDiagnostic = oldDiag_2;
                                 return newClause;
                             }
-                            return ts.updateHeritageClause(clause, ts.visitNodes(ts.createNodeArray(ts.filter(clause.types, function (t) { return ts.isEntityNameExpression(t.expression) || t.expression.kind === 95; })), visitDeclarationSubtree));
+                            return ts.updateHeritageClause(clause, ts.visitNodes(ts.createNodeArray(ts.filter(clause.types, function (t) { return ts.isEntityNameExpression(t.expression) || t.expression.kind === 95 /* NullKeyword */; })), visitDeclarationSubtree));
                         }));
-                        return [statement, cleanup(ts.updateClassDeclaration(input, undefined, modifiers, input.name, typeParameters, heritageClauses, members))];
+                        return [statement, cleanup(ts.updateClassDeclaration(input, 
+                            /*decorators*/ undefined, modifiers, input.name, typeParameters, heritageClauses, members))]; // TODO: GH#18217
                     }
                     else {
                         var heritageClauses = transformHeritageClauses(input.heritageClauses);
-                        return cleanup(ts.updateClassDeclaration(input, undefined, modifiers, input.name, typeParameters, heritageClauses, members));
+                        return cleanup(ts.updateClassDeclaration(input, 
+                        /*decorators*/ undefined, modifiers, input.name, typeParameters, heritageClauses, members));
                     }
                 }
-                case 214: {
+                case 214 /* VariableStatement */: {
                     return cleanup(transformVariableStatement(input, isPrivate));
                 }
-                case 238: {
-                    return cleanup(ts.updateEnumDeclaration(input, undefined, ts.createNodeArray(ensureModifiers(input, isPrivate)), input.name, ts.createNodeArray(ts.mapDefined(input.members, function (m) {
+                case 238 /* EnumDeclaration */: {
+                    return cleanup(ts.updateEnumDeclaration(input, /*decorators*/ undefined, ts.createNodeArray(ensureModifiers(input, isPrivate)), input.name, ts.createNodeArray(ts.mapDefined(input.members, function (m) {
                         if (shouldStripInternal(m))
                             return;
+                        // Rewrite enum values to their constants, if available
                         var constValue = resolver.getConstantValue(m);
                         return preserveJsDoc(ts.updateEnumMember(m, m.name, constValue !== undefined ? ts.createLiteral(constValue) : undefined), m);
                     }))));
                 }
             }
+            // Anything left unhandled is an error, so this should be unreachable
             return ts.Debug.assertNever(input, "Unhandled top-level node in declaration emit: " + ts.SyntaxKind[input.kind]);
             function cleanup(node) {
                 if (isEnclosingDeclaration(input)) {
@@ -60360,7 +75669,7 @@ var ts;
                 if (canProdiceDiagnostic) {
                     getSymbolAccessibilityDiagnostic = oldDiag;
                 }
-                if (input.kind === 239) {
+                if (input.kind === 239 /* ModuleDeclaration */) {
                     needsDeclare = previousNeedsDeclare;
                 }
                 if (node === input) {
@@ -60381,7 +75690,7 @@ var ts;
             return ts.flatten(ts.mapDefined(d.elements, function (e) { return recreateBindingElement(e); }));
         }
         function recreateBindingElement(e) {
-            if (e.kind === 206) {
+            if (e.kind === 206 /* OmittedExpression */) {
                 return;
             }
             if (e.name) {
@@ -60391,7 +75700,7 @@ var ts;
                     return recreateBindingPattern(e.name);
                 }
                 else {
-                    return ts.createVariableDeclaration(e.name, ensureType(e, undefined), undefined);
+                    return ts.createVariableDeclaration(e.name, ensureType(e, /*type*/ undefined), /*initializer*/ undefined);
                 }
             }
         }
@@ -60402,7 +75711,7 @@ var ts;
                 getSymbolAccessibilityDiagnostic = ts.createGetSymbolAccessibilityDiagnosticForNodeName(node);
             }
             errorNameNode = node.name;
-            ts.Debug.assert(resolver.isLateBound(ts.getParseTreeNode(node)));
+            ts.Debug.assert(resolver.isLateBound(ts.getParseTreeNode(node))); // Should only be called with dynamic names
             var decl = node;
             var entityName = decl.name.expression;
             checkEntityNameVisibility(entityName, enclosingDeclaration);
@@ -60433,12 +75742,12 @@ var ts;
             return ts.createModifiersFromModifierFlags(newFlags);
         }
         function ensureModifierFlags(node, privateDeclaration) {
-            var mask = 3071 ^ (4 | 256);
-            var additions = (needsDeclare && !isAlwaysType(node)) ? 2 : 0;
-            var parentIsFile = node.parent.kind === 274;
+            var mask = 3071 /* All */ ^ (4 /* Public */ | 256 /* Async */); // No async modifiers in declaration files
+            var additions = (needsDeclare && !isAlwaysType(node)) ? 2 /* Ambient */ : 0 /* None */;
+            var parentIsFile = node.parent.kind === 274 /* SourceFile */;
             if (!parentIsFile || (isBundledEmit && parentIsFile && ts.isExternalModule(node.parent))) {
-                mask ^= ((privateDeclaration || (isBundledEmit && parentIsFile) ? 0 : 1) | 512 | 2);
-                additions = 0;
+                mask ^= ((privateDeclaration || (isBundledEmit && parentIsFile) ? 0 : 1 /* Export */) | 512 /* Default */ | 2 /* Ambient */);
+                additions = 0 /* None */;
             }
             return maskModifierFlags(node, mask, additions);
         }
@@ -60450,13 +75759,14 @@ var ts;
             var accessorType = getTypeAnnotationFromAccessor(node);
             if (!accessorType && accessors.secondAccessor) {
                 accessorType = getTypeAnnotationFromAccessor(accessors.secondAccessor);
+                // If we end up pulling the type from the second accessor, we also need to change the diagnostic context to get the expected error message
                 getSymbolAccessibilityDiagnostic = ts.createGetSymbolAccessibilityDiagnosticForNode(accessors.secondAccessor);
             }
-            var prop = ts.createProperty(undefined, maskModifiers(node, undefined, (!accessors.setAccessor) ? 64 : 0), node.name, node.questionToken, ensureType(node, accessorType), undefined);
+            var prop = ts.createProperty(/*decorators*/ undefined, maskModifiers(node, /*mask*/ undefined, (!accessors.setAccessor) ? 64 /* Readonly */ : 0 /* None */), node.name, node.questionToken, ensureType(node, accessorType), /*initializer*/ undefined);
             var leadingsSyntheticCommentRanges = accessors.secondAccessor && ts.getLeadingCommentRangesOfNode(accessors.secondAccessor, currentSourceFile);
             if (leadingsSyntheticCommentRanges) {
-                var _loop_9 = function (range) {
-                    if (range.kind === 3) {
+                var _loop_7 = function (range) {
+                    if (range.kind === 3 /* MultiLineCommentTrivia */) {
                         var text = currentSourceFile.text.slice(range.pos + 2, range.end - 2);
                         var lines = text.split(/\r\n?|\n/g);
                         if (lines.length > 1) {
@@ -60469,97 +75779,99 @@ var ts;
                 };
                 for (var _i = 0, leadingsSyntheticCommentRanges_1 = leadingsSyntheticCommentRanges; _i < leadingsSyntheticCommentRanges_1.length; _i++) {
                     var range = leadingsSyntheticCommentRanges_1[_i];
-                    _loop_9(range);
+                    _loop_7(range);
                 }
             }
             return prop;
         }
         function transformHeritageClauses(nodes) {
             return ts.createNodeArray(ts.filter(ts.map(nodes, function (clause) { return ts.updateHeritageClause(clause, ts.visitNodes(ts.createNodeArray(ts.filter(clause.types, function (t) {
-                return ts.isEntityNameExpression(t.expression) || (clause.token === 85 && t.expression.kind === 95);
+                return ts.isEntityNameExpression(t.expression) || (clause.token === 85 /* ExtendsKeyword */ && t.expression.kind === 95 /* NullKeyword */);
             })), visitDeclarationSubtree)); }), function (clause) { return clause.types && !!clause.types.length; }));
         }
     }
     ts.transformDeclarations = transformDeclarations;
     function isAlwaysType(node) {
-        if (node.kind === 236) {
+        if (node.kind === 236 /* InterfaceDeclaration */) {
             return true;
         }
         return false;
     }
+    // Elide "public" modifier, as it is the default
     function maskModifiers(node, modifierMask, modifierAdditions) {
         return ts.createModifiersFromModifierFlags(maskModifierFlags(node, modifierMask, modifierAdditions));
     }
     function maskModifierFlags(node, modifierMask, modifierAdditions) {
-        if (modifierMask === void 0) { modifierMask = 3071 ^ 4; }
-        if (modifierAdditions === void 0) { modifierAdditions = 0; }
+        if (modifierMask === void 0) { modifierMask = 3071 /* All */ ^ 4 /* Public */; }
+        if (modifierAdditions === void 0) { modifierAdditions = 0 /* None */; }
         var flags = (ts.getModifierFlags(node) & modifierMask) | modifierAdditions;
-        if (flags & 512 && flags & 2) {
-            flags ^= 2;
+        if (flags & 512 /* Default */ && flags & 2 /* Ambient */) {
+            flags ^= 2 /* Ambient */; // `declare` is never required alongside `default` (and would be an error if printed)
         }
         return flags;
     }
     function getTypeAnnotationFromAccessor(accessor) {
         if (accessor) {
-            return accessor.kind === 156
-                ? accessor.type
+            return accessor.kind === 156 /* GetAccessor */
+                ? accessor.type // Getter - return type
                 : accessor.parameters.length > 0
-                    ? accessor.parameters[0].type
+                    ? accessor.parameters[0].type // Setter parameter type
                     : undefined;
         }
     }
     function canHaveLiteralInitializer(node) {
         switch (node.kind) {
-            case 232:
-            case 152:
-            case 151:
-            case 149:
+            case 232 /* VariableDeclaration */:
+            case 152 /* PropertyDeclaration */:
+            case 151 /* PropertySignature */:
+            case 149 /* Parameter */:
                 return true;
         }
         return false;
     }
     function isPreservedDeclarationStatement(node) {
         switch (node.kind) {
-            case 234:
-            case 239:
-            case 243:
-            case 236:
-            case 235:
-            case 237:
-            case 238:
-            case 214:
-            case 244:
-            case 250:
-            case 249:
+            case 234 /* FunctionDeclaration */:
+            case 239 /* ModuleDeclaration */:
+            case 243 /* ImportEqualsDeclaration */:
+            case 236 /* InterfaceDeclaration */:
+            case 235 /* ClassDeclaration */:
+            case 237 /* TypeAliasDeclaration */:
+            case 238 /* EnumDeclaration */:
+            case 214 /* VariableStatement */:
+            case 244 /* ImportDeclaration */:
+            case 250 /* ExportDeclaration */:
+            case 249 /* ExportAssignment */:
                 return true;
         }
         return false;
     }
     function isProcessedComponent(node) {
         switch (node.kind) {
-            case 159:
-            case 155:
-            case 154:
-            case 156:
-            case 157:
-            case 152:
-            case 151:
-            case 153:
-            case 158:
-            case 160:
-            case 232:
-            case 148:
-            case 207:
-            case 162:
-            case 171:
-            case 163:
-            case 164:
-            case 179:
+            case 159 /* ConstructSignature */:
+            case 155 /* Constructor */:
+            case 154 /* MethodDeclaration */:
+            case 156 /* GetAccessor */:
+            case 157 /* SetAccessor */:
+            case 152 /* PropertyDeclaration */:
+            case 151 /* PropertySignature */:
+            case 153 /* MethodSignature */:
+            case 158 /* CallSignature */:
+            case 160 /* IndexSignature */:
+            case 232 /* VariableDeclaration */:
+            case 148 /* TypeParameter */:
+            case 207 /* ExpressionWithTypeArguments */:
+            case 162 /* TypeReference */:
+            case 171 /* ConditionalType */:
+            case 163 /* FunctionType */:
+            case 164 /* ConstructorType */:
+            case 179 /* ImportType */:
                 return true;
         }
         return false;
     }
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     function getModuleTransformer(moduleKind) {
@@ -60592,32 +75904,44 @@ var ts;
         var transformers = [];
         ts.addRange(transformers, customTransformers && customTransformers.before);
         transformers.push(ts.transformTypeScript);
-        if (jsx === 2) {
+        if (jsx === 2 /* React */) {
             transformers.push(ts.transformJsx);
         }
-        if (languageVersion < 6) {
+        if (languageVersion < 6 /* ESNext */) {
             transformers.push(ts.transformESNext);
         }
-        if (languageVersion < 4) {
+        if (languageVersion < 4 /* ES2017 */) {
             transformers.push(ts.transformES2017);
         }
-        if (languageVersion < 3) {
+        if (languageVersion < 3 /* ES2016 */) {
             transformers.push(ts.transformES2016);
         }
-        if (languageVersion < 2) {
+        if (languageVersion < 2 /* ES2015 */) {
             transformers.push(ts.transformES2015);
             transformers.push(ts.transformGenerators);
         }
         transformers.push(getModuleTransformer(moduleKind));
-        if (languageVersion < 1) {
+        // The ES5 transformer is last so that it can substitute expressions like `exports.default`
+        // for ES3.
+        if (languageVersion < 1 /* ES5 */) {
             transformers.push(ts.transformES5);
         }
         ts.addRange(transformers, customTransformers && customTransformers.after);
         return transformers;
     }
     ts.getTransformers = getTransformers;
+    /**
+     * Transforms an array of SourceFiles by passing them through each transformer.
+     *
+     * @param resolver The emit resolver provided by the checker.
+     * @param host The emit host object used to interact with the file system.
+     * @param options Compiler options to surface in the `TransformationContext`.
+     * @param nodes An array of nodes to transform.
+     * @param transforms An array of `TransformerFactory` callbacks.
+     * @param allowDtsFiles A value indicating whether to allow the transformation of .d.ts files.
+     */
     function transformNodes(resolver, host, options, nodes, transformers, allowDtsFiles) {
-        var enabledSyntaxKindFeatures = new Array(305);
+        var enabledSyntaxKindFeatures = new Array(305 /* Count */);
         var lexicalEnvironmentVariableDeclarations;
         var lexicalEnvironmentFunctionDeclarations;
         var lexicalEnvironmentVariableDeclarationsStack = [];
@@ -60627,8 +75951,10 @@ var ts;
         var emitHelpers;
         var onSubstituteNode = function (_, node) { return node; };
         var onEmitNode = function (hint, node, callback) { return callback(hint, node); };
-        var state = 0;
+        var state = 0 /* Uninitialized */;
         var diagnostics = [];
+        // The transformation context is provided to each transformer as part of transformer
+        // initialization.
         var context = {
             getCompilerOptions: function () { return options; },
             getEmitResolver: function () { return resolver; },
@@ -60647,13 +75973,13 @@ var ts;
             isEmitNotificationEnabled: isEmitNotificationEnabled,
             get onSubstituteNode() { return onSubstituteNode; },
             set onSubstituteNode(value) {
-                ts.Debug.assert(state < 1, "Cannot modify transformation hooks after initialization has completed.");
+                ts.Debug.assert(state < 1 /* Initialized */, "Cannot modify transformation hooks after initialization has completed.");
                 ts.Debug.assert(value !== undefined, "Value must not be 'undefined'");
                 onSubstituteNode = value;
             },
             get onEmitNode() { return onEmitNode; },
             set onEmitNode(value) {
-                ts.Debug.assert(state < 1, "Cannot modify transformation hooks after initialization has completed.");
+                ts.Debug.assert(state < 1 /* Initialized */, "Cannot modify transformation hooks after initialization has completed.");
                 ts.Debug.assert(value !== undefined, "Value must not be 'undefined'");
                 onEmitNode = value;
             },
@@ -60661,15 +75987,20 @@ var ts;
                 diagnostics.push(diag);
             }
         };
-        for (var _i = 0, nodes_4 = nodes; _i < nodes_4.length; _i++) {
-            var node = nodes_4[_i];
+        // Ensure the parse tree is clean before applying transformations
+        for (var _i = 0, nodes_3 = nodes; _i < nodes_3.length; _i++) {
+            var node = nodes_3[_i];
             ts.disposeEmitNodes(ts.getSourceFileOfNode(ts.getParseTreeNode(node)));
         }
         ts.performance.mark("beforeTransform");
+        // Chain together and initialize each transformer.
         var transformation = ts.chain.apply(void 0, transformers)(context);
-        state = 1;
+        // prevent modification of transformation hooks.
+        state = 1 /* Initialized */;
+        // Transform each node.
         var transformed = ts.map(nodes, allowDtsFiles ? transformation : transformRoot);
-        state = 2;
+        // prevent modification of the lexical environment.
+        state = 2 /* Completed */;
         ts.performance.mark("afterTransform");
         ts.performance.measure("transformTime", "beforeTransform", "afterTransform");
         return {
@@ -60682,28 +76013,55 @@ var ts;
         function transformRoot(node) {
             return node && (!ts.isSourceFile(node) || !node.isDeclarationFile) ? transformation(node) : node;
         }
+        /**
+         * Enables expression substitutions in the pretty printer for the provided SyntaxKind.
+         */
         function enableSubstitution(kind) {
-            ts.Debug.assert(state < 2, "Cannot modify the transformation context after transformation has completed.");
-            enabledSyntaxKindFeatures[kind] |= 1;
+            ts.Debug.assert(state < 2 /* Completed */, "Cannot modify the transformation context after transformation has completed.");
+            enabledSyntaxKindFeatures[kind] |= 1 /* Substitution */;
         }
+        /**
+         * Determines whether expression substitutions are enabled for the provided node.
+         */
         function isSubstitutionEnabled(node) {
-            return (enabledSyntaxKindFeatures[node.kind] & 1) !== 0
-                && (ts.getEmitFlags(node) & 4) === 0;
+            return (enabledSyntaxKindFeatures[node.kind] & 1 /* Substitution */) !== 0
+                && (ts.getEmitFlags(node) & 4 /* NoSubstitution */) === 0;
         }
+        /**
+         * Emits a node with possible substitution.
+         *
+         * @param hint A hint as to the intended usage of the node.
+         * @param node The node to emit.
+         * @param emitCallback The callback used to emit the node or its substitute.
+         */
         function substituteNode(hint, node) {
-            ts.Debug.assert(state < 3, "Cannot substitute a node after the result is disposed.");
+            ts.Debug.assert(state < 3 /* Disposed */, "Cannot substitute a node after the result is disposed.");
             return node && isSubstitutionEnabled(node) && onSubstituteNode(hint, node) || node;
         }
+        /**
+         * Enables before/after emit notifications in the pretty printer for the provided SyntaxKind.
+         */
         function enableEmitNotification(kind) {
-            ts.Debug.assert(state < 2, "Cannot modify the transformation context after transformation has completed.");
-            enabledSyntaxKindFeatures[kind] |= 2;
+            ts.Debug.assert(state < 2 /* Completed */, "Cannot modify the transformation context after transformation has completed.");
+            enabledSyntaxKindFeatures[kind] |= 2 /* EmitNotifications */;
         }
+        /**
+         * Determines whether before/after emit notifications should be raised in the pretty
+         * printer when it emits a node.
+         */
         function isEmitNotificationEnabled(node) {
-            return (enabledSyntaxKindFeatures[node.kind] & 2) !== 0
-                || (ts.getEmitFlags(node) & 2) !== 0;
+            return (enabledSyntaxKindFeatures[node.kind] & 2 /* EmitNotifications */) !== 0
+                || (ts.getEmitFlags(node) & 2 /* AdviseOnEmitNode */) !== 0;
         }
+        /**
+         * Emits a node with possible emit notification.
+         *
+         * @param hint A hint as to the intended usage of the node.
+         * @param node The node to emit.
+         * @param emitCallback The callback used to emit the node.
+         */
         function emitNodeWithNotification(hint, node, emitCallback) {
-            ts.Debug.assert(state < 3, "Cannot invoke TransformationResult callbacks after the result is disposed.");
+            ts.Debug.assert(state < 3 /* Disposed */, "Cannot invoke TransformationResult callbacks after the result is disposed.");
             if (node) {
                 if (isEmitNotificationEnabled(node)) {
                     onEmitNode(hint, node, emitCallback);
@@ -60713,10 +76071,13 @@ var ts;
                 }
             }
         }
+        /**
+         * Records a hoisted variable declaration for the provided name within a lexical environment.
+         */
         function hoistVariableDeclaration(name) {
-            ts.Debug.assert(state > 0, "Cannot modify the lexical environment during initialization.");
-            ts.Debug.assert(state < 2, "Cannot modify the lexical environment after transformation has completed.");
-            var decl = ts.setEmitFlags(ts.createVariableDeclaration(name), 64);
+            ts.Debug.assert(state > 0 /* Uninitialized */, "Cannot modify the lexical environment during initialization.");
+            ts.Debug.assert(state < 2 /* Completed */, "Cannot modify the lexical environment after transformation has completed.");
+            var decl = ts.setEmitFlags(ts.createVariableDeclaration(name), 64 /* NoNestedSourceMaps */);
             if (!lexicalEnvironmentVariableDeclarations) {
                 lexicalEnvironmentVariableDeclarations = [decl];
             }
@@ -60724,9 +76085,12 @@ var ts;
                 lexicalEnvironmentVariableDeclarations.push(decl);
             }
         }
+        /**
+         * Records a hoisted function declaration within a lexical environment.
+         */
         function hoistFunctionDeclaration(func) {
-            ts.Debug.assert(state > 0, "Cannot modify the lexical environment during initialization.");
-            ts.Debug.assert(state < 2, "Cannot modify the lexical environment after transformation has completed.");
+            ts.Debug.assert(state > 0 /* Uninitialized */, "Cannot modify the lexical environment during initialization.");
+            ts.Debug.assert(state < 2 /* Completed */, "Cannot modify the lexical environment after transformation has completed.");
             if (!lexicalEnvironmentFunctionDeclarations) {
                 lexicalEnvironmentFunctionDeclarations = [func];
             }
@@ -60734,31 +76098,45 @@ var ts;
                 lexicalEnvironmentFunctionDeclarations.push(func);
             }
         }
+        /**
+         * Starts a new lexical environment. Any existing hoisted variable or function declarations
+         * are pushed onto a stack, and the related storage variables are reset.
+         */
         function startLexicalEnvironment() {
-            ts.Debug.assert(state > 0, "Cannot modify the lexical environment during initialization.");
-            ts.Debug.assert(state < 2, "Cannot modify the lexical environment after transformation has completed.");
+            ts.Debug.assert(state > 0 /* Uninitialized */, "Cannot modify the lexical environment during initialization.");
+            ts.Debug.assert(state < 2 /* Completed */, "Cannot modify the lexical environment after transformation has completed.");
             ts.Debug.assert(!lexicalEnvironmentSuspended, "Lexical environment is suspended.");
+            // Save the current lexical environment. Rather than resizing the array we adjust the
+            // stack size variable. This allows us to reuse existing array slots we've
+            // already allocated between transformations to avoid allocation and GC overhead during
+            // transformation.
             lexicalEnvironmentVariableDeclarationsStack[lexicalEnvironmentStackOffset] = lexicalEnvironmentVariableDeclarations;
             lexicalEnvironmentFunctionDeclarationsStack[lexicalEnvironmentStackOffset] = lexicalEnvironmentFunctionDeclarations;
             lexicalEnvironmentStackOffset++;
             lexicalEnvironmentVariableDeclarations = undefined;
             lexicalEnvironmentFunctionDeclarations = undefined;
         }
+        /** Suspends the current lexical environment, usually after visiting a parameter list. */
         function suspendLexicalEnvironment() {
-            ts.Debug.assert(state > 0, "Cannot modify the lexical environment during initialization.");
-            ts.Debug.assert(state < 2, "Cannot modify the lexical environment after transformation has completed.");
+            ts.Debug.assert(state > 0 /* Uninitialized */, "Cannot modify the lexical environment during initialization.");
+            ts.Debug.assert(state < 2 /* Completed */, "Cannot modify the lexical environment after transformation has completed.");
             ts.Debug.assert(!lexicalEnvironmentSuspended, "Lexical environment is already suspended.");
             lexicalEnvironmentSuspended = true;
         }
+        /** Resumes a suspended lexical environment, usually before visiting a function body. */
         function resumeLexicalEnvironment() {
-            ts.Debug.assert(state > 0, "Cannot modify the lexical environment during initialization.");
-            ts.Debug.assert(state < 2, "Cannot modify the lexical environment after transformation has completed.");
+            ts.Debug.assert(state > 0 /* Uninitialized */, "Cannot modify the lexical environment during initialization.");
+            ts.Debug.assert(state < 2 /* Completed */, "Cannot modify the lexical environment after transformation has completed.");
             ts.Debug.assert(lexicalEnvironmentSuspended, "Lexical environment is not suspended.");
             lexicalEnvironmentSuspended = false;
         }
+        /**
+         * Ends a lexical environment. The previous set of hoisted declarations are restored and
+         * any hoisted declarations added in this environment are returned.
+         */
         function endLexicalEnvironment() {
-            ts.Debug.assert(state > 0, "Cannot modify the lexical environment during initialization.");
-            ts.Debug.assert(state < 2, "Cannot modify the lexical environment after transformation has completed.");
+            ts.Debug.assert(state > 0 /* Uninitialized */, "Cannot modify the lexical environment during initialization.");
+            ts.Debug.assert(state < 2 /* Completed */, "Cannot modify the lexical environment after transformation has completed.");
             ts.Debug.assert(!lexicalEnvironmentSuspended, "Lexical environment is suspended.");
             var statements;
             if (lexicalEnvironmentVariableDeclarations || lexicalEnvironmentFunctionDeclarations) {
@@ -60766,7 +76144,8 @@ var ts;
                     statements = lexicalEnvironmentFunctionDeclarations.slice();
                 }
                 if (lexicalEnvironmentVariableDeclarations) {
-                    var statement = ts.createVariableStatement(undefined, ts.createVariableDeclarationList(lexicalEnvironmentVariableDeclarations));
+                    var statement = ts.createVariableStatement(
+                    /*modifiers*/ undefined, ts.createVariableDeclarationList(lexicalEnvironmentVariableDeclarations));
                     if (!statements) {
                         statements = [statement];
                     }
@@ -60775,6 +76154,7 @@ var ts;
                     }
                 }
             }
+            // Restore the previous lexical environment.
             lexicalEnvironmentStackOffset--;
             lexicalEnvironmentVariableDeclarations = lexicalEnvironmentVariableDeclarationsStack[lexicalEnvironmentStackOffset];
             lexicalEnvironmentFunctionDeclarations = lexicalEnvironmentFunctionDeclarationsStack[lexicalEnvironmentStackOffset];
@@ -60785,24 +76165,26 @@ var ts;
             return statements;
         }
         function requestEmitHelper(helper) {
-            ts.Debug.assert(state > 0, "Cannot modify the transformation context during initialization.");
-            ts.Debug.assert(state < 2, "Cannot modify the transformation context after transformation has completed.");
+            ts.Debug.assert(state > 0 /* Uninitialized */, "Cannot modify the transformation context during initialization.");
+            ts.Debug.assert(state < 2 /* Completed */, "Cannot modify the transformation context after transformation has completed.");
             ts.Debug.assert(!helper.scoped, "Cannot request a scoped emit helper.");
             emitHelpers = ts.append(emitHelpers, helper);
         }
         function readEmitHelpers() {
-            ts.Debug.assert(state > 0, "Cannot modify the transformation context during initialization.");
-            ts.Debug.assert(state < 2, "Cannot modify the transformation context after transformation has completed.");
+            ts.Debug.assert(state > 0 /* Uninitialized */, "Cannot modify the transformation context during initialization.");
+            ts.Debug.assert(state < 2 /* Completed */, "Cannot modify the transformation context after transformation has completed.");
             var helpers = emitHelpers;
             emitHelpers = undefined;
             return helpers;
         }
         function dispose() {
-            if (state < 3) {
-                for (var _i = 0, nodes_5 = nodes; _i < nodes_5.length; _i++) {
-                    var node = nodes_5[_i];
+            if (state < 3 /* Disposed */) {
+                // Clean up emit nodes on parse tree
+                for (var _i = 0, nodes_4 = nodes; _i < nodes_4.length; _i++) {
+                    var node = nodes_4[_i];
                     ts.disposeEmitNodes(ts.getSourceFileOfNode(ts.getParseTreeNode(node)));
                 }
+                // Release references to external entries for GC purposes.
                 lexicalEnvironmentVariableDeclarations = undefined;
                 lexicalEnvironmentVariableDeclarationsStack = undefined;
                 lexicalEnvironmentFunctionDeclarations = undefined;
@@ -60810,14 +76192,17 @@ var ts;
                 onSubstituteNode = undefined;
                 onEmitNode = undefined;
                 emitHelpers = undefined;
-                state = 3;
+                // Prevent further use of the transformation result.
+                state = 3 /* Disposed */;
             }
         }
     }
     ts.transformNodes = transformNodes;
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
+    // Used for initialize lastEncodedSourceMapSpan and reset lastEncodedSourceMapSpan when updateLastEncodedAndRecordedSpans
     var defaultLastEncodedSourceMapSpan = {
         emittedLine: 1,
         emittedColumn: 1,
@@ -60830,14 +76215,20 @@ var ts;
         var extendedDiagnostics = compilerOptions.extendedDiagnostics;
         var currentSource;
         var currentSourceText;
-        var sourceMapDir;
+        var sourceMapDir; // The directory in which sourcemap will be
+        // Current source map file and its index in the sources list
         var sourceMapSourceIndex;
+        // Last recorded and encoded spans
         var lastRecordedSourceMapSpan;
         var lastEncodedSourceMapSpan;
         var lastEncodedNameIndex;
+        // Source map data
         var sourceMapData;
         var sourceMapDataList;
         var disabled = !(compilerOptions.sourceMap || compilerOptions.inlineSourceMap);
+        var completedSections;
+        var sectionStartLine;
+        var sectionStartColumn;
         return {
             initialize: initialize,
             reset: reset,
@@ -60848,11 +76239,21 @@ var ts;
             getText: getText,
             getSourceMappingURL: getSourceMappingURL,
         };
+        /**
+         * Skips trivia such as comments and white-space that can optionally overriden by the source map source
+         */
         function skipSourceTrivia(pos) {
             return currentSource.skipTrivia ? currentSource.skipTrivia(pos) : ts.skipTrivia(currentSourceText, pos);
         }
+        /**
+         * Initialize the SourceMapWriter for a new output file.
+         *
+         * @param filePath The path to the generated output file.
+         * @param sourceMapFilePath The path to the output source map file.
+         * @param sourceFileOrBundle The input source file or bundle for the program.
+         */
         function initialize(filePath, sourceMapFilePath, sourceFileOrBundle, outputSourceMapDataList) {
-            if (disabled || ts.fileExtensionIs(filePath, ".json")) {
+            if (disabled || ts.fileExtensionIs(filePath, ".json" /* Json */)) {
                 return;
             }
             if (sourceMapData) {
@@ -60861,10 +76262,16 @@ var ts;
             sourceMapDataList = outputSourceMapDataList;
             currentSource = undefined;
             currentSourceText = undefined;
+            // Current source map file and its index in the sources list
             sourceMapSourceIndex = -1;
+            // Last recorded and encoded spans
             lastRecordedSourceMapSpan = undefined;
             lastEncodedSourceMapSpan = defaultLastEncodedSourceMapSpan;
             lastEncodedNameIndex = 0;
+            // Initialize source map data
+            completedSections = [];
+            sectionStartLine = 1;
+            sectionStartColumn = 1;
             sourceMapData = {
                 sourceMapFilePath: sourceMapFilePath,
                 jsSourceMappingURL: !compilerOptions.inlineSourceMap ? ts.getBaseFileName(ts.normalizeSlashes(sourceMapFilePath)) : undefined,
@@ -60877,18 +76284,26 @@ var ts;
                 sourceMapSourcesContent: compilerOptions.inlineSources ? [] : undefined,
                 sourceMapDecodedMappings: []
             };
+            // Normalize source root and make sure it has trailing "/" so that it can be used to combine paths with the
+            // relative paths of the sources list in the sourcemap
             sourceMapData.sourceMapSourceRoot = ts.normalizeSlashes(sourceMapData.sourceMapSourceRoot);
-            if (sourceMapData.sourceMapSourceRoot.length && sourceMapData.sourceMapSourceRoot.charCodeAt(sourceMapData.sourceMapSourceRoot.length - 1) !== 47) {
+            if (sourceMapData.sourceMapSourceRoot.length && sourceMapData.sourceMapSourceRoot.charCodeAt(sourceMapData.sourceMapSourceRoot.length - 1) !== 47 /* slash */) {
                 sourceMapData.sourceMapSourceRoot += ts.directorySeparator;
             }
             if (compilerOptions.mapRoot) {
                 sourceMapDir = ts.normalizeSlashes(compilerOptions.mapRoot);
-                if (sourceFileOrBundle.kind === 274) {
+                if (sourceFileOrBundle.kind === 274 /* SourceFile */) { // emitting single module file
+                    // For modules or multiple emit files the mapRoot will have directory structure like the sources
+                    // So if src\a.ts and src\lib\b.ts are compiled together user would be moving the maps into mapRoot\a.js.map and mapRoot\lib\b.js.map
                     sourceMapDir = ts.getDirectoryPath(ts.getSourceFilePathInNewDir(sourceFileOrBundle, host, sourceMapDir));
                 }
                 if (!ts.isRootedDiskPath(sourceMapDir) && !ts.isUrl(sourceMapDir)) {
+                    // The relative paths are relative to the common directory
                     sourceMapDir = ts.combinePaths(host.getCommonSourceDirectory(), sourceMapDir);
-                    sourceMapData.jsSourceMappingURL = ts.getRelativePathToDirectoryOrUrl(ts.getDirectoryPath(ts.normalizePath(filePath)), ts.combinePaths(sourceMapDir, sourceMapData.jsSourceMappingURL), host.getCurrentDirectory(), host.getCanonicalFileName, true);
+                    sourceMapData.jsSourceMappingURL = ts.getRelativePathToDirectoryOrUrl(ts.getDirectoryPath(ts.normalizePath(filePath)), // get the relative sourceMapDir path based on jsFilePath
+                    ts.combinePaths(sourceMapDir, sourceMapData.jsSourceMappingURL), // this is where user expects to see sourceMap
+                    host.getCurrentDirectory(), host.getCanonicalFileName, 
+                    /*isAbsolutePathAnUrl*/ true);
                 }
                 else {
                     sourceMapData.jsSourceMappingURL = ts.combinePaths(sourceMapDir, sourceMapData.jsSourceMappingURL);
@@ -60898,10 +76313,14 @@ var ts;
                 sourceMapDir = ts.getDirectoryPath(ts.normalizePath(filePath));
             }
         }
+        /**
+         * Reset the SourceMapWriter to an empty state.
+         */
         function reset() {
             if (disabled) {
                 return;
             }
+            // Record source map data for the test harness.
             if (sourceMapDataList) {
                 sourceMapDataList.push(sourceMapData);
             }
@@ -60913,27 +76332,69 @@ var ts;
             lastEncodedNameIndex = undefined;
             sourceMapData = undefined;
             sourceMapDataList = undefined;
+            completedSections = undefined;
+            sectionStartLine = undefined;
+            sectionStartColumn = undefined;
         }
+        function captureSection() {
+            return {
+                version: 3,
+                file: sourceMapData.sourceMapFile,
+                sourceRoot: sourceMapData.sourceMapSourceRoot,
+                sources: sourceMapData.sourceMapSources,
+                names: sourceMapData.sourceMapNames,
+                mappings: sourceMapData.sourceMapMappings,
+                sourcesContent: sourceMapData.sourceMapSourcesContent,
+            };
+        }
+        function resetSectionalData() {
+            sourceMapData.sourceMapSources = [];
+            sourceMapData.sourceMapNames = [];
+            sourceMapData.sourceMapMappings = "";
+            sourceMapData.sourceMapSourcesContent = compilerOptions.inlineSources ? [] : undefined;
+        }
+        function generateMap() {
+            if (completedSections.length) {
+                captureSectionalSpanIfNeeded(/*reset*/ false);
+                return {
+                    version: 3,
+                    file: sourceMapData.sourceMapFile,
+                    sections: completedSections
+                };
+            }
+            else {
+                return captureSection();
+            }
+        }
+        // Encoding for sourcemap span
         function encodeLastRecordedSourceMapSpan() {
             if (!lastRecordedSourceMapSpan || lastRecordedSourceMapSpan === lastEncodedSourceMapSpan) {
                 return;
             }
             var prevEncodedEmittedColumn = lastEncodedSourceMapSpan.emittedColumn;
+            // Line/Comma delimiters
             if (lastEncodedSourceMapSpan.emittedLine === lastRecordedSourceMapSpan.emittedLine) {
+                // Emit comma to separate the entry
                 if (sourceMapData.sourceMapMappings) {
                     sourceMapData.sourceMapMappings += ",";
                 }
             }
             else {
+                // Emit line delimiters
                 for (var encodedLine = lastEncodedSourceMapSpan.emittedLine; encodedLine < lastRecordedSourceMapSpan.emittedLine; encodedLine++) {
                     sourceMapData.sourceMapMappings += ";";
                 }
                 prevEncodedEmittedColumn = 1;
             }
+            // 1. Relative Column 0 based
             sourceMapData.sourceMapMappings += base64VLQFormatEncode(lastRecordedSourceMapSpan.emittedColumn - prevEncodedEmittedColumn);
+            // 2. Relative sourceIndex
             sourceMapData.sourceMapMappings += base64VLQFormatEncode(lastRecordedSourceMapSpan.sourceIndex - lastEncodedSourceMapSpan.sourceIndex);
+            // 3. Relative sourceLine 0 based
             sourceMapData.sourceMapMappings += base64VLQFormatEncode(lastRecordedSourceMapSpan.sourceLine - lastEncodedSourceMapSpan.sourceLine);
+            // 4. Relative sourceColumn 0 based
             sourceMapData.sourceMapMappings += base64VLQFormatEncode(lastRecordedSourceMapSpan.sourceColumn - lastEncodedSourceMapSpan.sourceColumn);
+            // 5. Relative namePosition 0 based
             if (lastRecordedSourceMapSpan.nameIndex >= 0) {
                 ts.Debug.assert(false, "We do not support name index right now, Make sure to update updateLastEncodedAndRecordedSpans when we start using this");
                 sourceMapData.sourceMapMappings += base64VLQFormatEncode(lastRecordedSourceMapSpan.nameIndex - lastEncodedNameIndex);
@@ -60942,6 +76403,14 @@ var ts;
             lastEncodedSourceMapSpan = lastRecordedSourceMapSpan;
             sourceMapData.sourceMapDecodedMappings.push(lastEncodedSourceMapSpan);
         }
+        /**
+         * Emits a mapping.
+         *
+         * If the position is synthetic (undefined or a negative value), no mapping will be
+         * created.
+         *
+         * @param pos The position.
+         */
         function emitPos(pos) {
             if (disabled || ts.positionIsSynthesized(pos) || isJsonSourceMapSource(currentSource)) {
                 return;
@@ -60950,17 +76419,21 @@ var ts;
                 ts.performance.mark("beforeSourcemap");
             }
             var sourceLinePos = ts.getLineAndCharacterOfPosition(currentSource, pos);
+            // Convert the location to be one-based.
             sourceLinePos.line++;
             sourceLinePos.character++;
-            var emittedLine = writer.getLine();
-            var emittedColumn = writer.getColumn();
+            var emittedLine = writer.getLine() - sectionStartLine + 1;
+            var emittedColumn = emittedLine === 0 ? (writer.getColumn() - sectionStartColumn + 1) : writer.getColumn();
+            // If this location wasn't recorded or the location in source is going backwards, record the span
             if (!lastRecordedSourceMapSpan ||
                 lastRecordedSourceMapSpan.emittedLine !== emittedLine ||
                 lastRecordedSourceMapSpan.emittedColumn !== emittedColumn ||
                 (lastRecordedSourceMapSpan.sourceIndex === sourceMapSourceIndex &&
                     (lastRecordedSourceMapSpan.sourceLine > sourceLinePos.line ||
                         (lastRecordedSourceMapSpan.sourceLine === sourceLinePos.line && lastRecordedSourceMapSpan.sourceColumn > sourceLinePos.character)))) {
+                // Encode the last recordedSpan before assigning new
                 encodeLastRecordedSourceMapSpan();
+                // New span
                 lastRecordedSourceMapSpan = {
                     emittedLine: emittedLine,
                     emittedColumn: emittedColumn,
@@ -60970,6 +76443,7 @@ var ts;
                 };
             }
             else {
+                // Take the new pos instead since there is no change in emittedLine and column since last location
                 lastRecordedSourceMapSpan.sourceLine = sourceLinePos.line;
                 lastRecordedSourceMapSpan.sourceColumn = sourceLinePos.character;
                 lastRecordedSourceMapSpan.sourceIndex = sourceMapSourceIndex;
@@ -60979,29 +76453,72 @@ var ts;
                 ts.performance.measure("Source Map", "beforeSourcemap", "afterSourcemap");
             }
         }
+        function captureSectionalSpanIfNeeded(reset) {
+            if (lastRecordedSourceMapSpan && lastRecordedSourceMapSpan === lastEncodedSourceMapSpan) { // If we've recorded some spans, save them
+                completedSections.push({ offset: { line: sectionStartLine - 1, column: sectionStartColumn - 1 }, map: captureSection() });
+                if (reset) {
+                    resetSectionalData();
+                }
+            }
+        }
+        /**
+         * Emits a node with possible leading and trailing source maps.
+         *
+         * @param hint A hint as to the intended usage of the node.
+         * @param node The node to emit.
+         * @param emitCallback The callback used to emit the node.
+         */
         function emitNodeWithSourceMap(hint, node, emitCallback) {
             if (disabled || ts.isInJsonFile(node)) {
                 return emitCallback(hint, node);
             }
             if (node) {
+                if (ts.isUnparsedSource(node) && node.sourceMapText !== undefined) {
+                    captureSectionalSpanIfNeeded(/*reset*/ true);
+                    var text = node.sourceMapText;
+                    var parsed = void 0;
+                    try {
+                        parsed = JSON.parse(text);
+                    }
+                    catch (_a) {
+                        // empty
+                    }
+                    var offset = { line: writer.getLine() - 1, column: writer.getColumn() - 1 };
+                    completedSections.push(parsed
+                        ? {
+                            offset: offset,
+                            map: parsed
+                        }
+                        : {
+                            offset: offset,
+                            // This is just passes the buck on sourcemaps we don't really understand, instead of issuing an error (which would be difficult this late)
+                            url: "data:application/json;charset=utf-8;base64," + ts.base64encode(ts.sys, text)
+                        });
+                    var emitResult = emitCallback(hint, node);
+                    sectionStartLine = writer.getLine();
+                    sectionStartColumn = writer.getColumn();
+                    lastRecordedSourceMapSpan = undefined;
+                    lastEncodedSourceMapSpan = defaultLastEncodedSourceMapSpan;
+                    return emitResult;
+                }
                 var emitNode = node.emitNode;
-                var emitFlags = emitNode && emitNode.flags || 0;
+                var emitFlags = emitNode && emitNode.flags || 0 /* None */;
                 var range = emitNode && emitNode.sourceMapRange;
-                var _a = range || node, pos = _a.pos, end = _a.end;
+                var _b = range || node, pos = _b.pos, end = _b.end;
                 var source = range && range.source;
                 var oldSource = currentSource;
                 if (source === oldSource)
                     source = undefined;
                 if (source)
                     setSourceFile(source);
-                if (node.kind !== 300
-                    && (emitFlags & 16) === 0
+                if (node.kind !== 300 /* NotEmittedStatement */
+                    && (emitFlags & 16 /* NoLeadingSourceMap */) === 0
                     && pos >= 0) {
                     emitPos(skipSourceTrivia(pos));
                 }
                 if (source)
                     setSourceFile(oldSource);
-                if (emitFlags & 64) {
+                if (emitFlags & 64 /* NoNestedSourceMaps */) {
                     disabled = true;
                     emitCallback(hint, node);
                     disabled = false;
@@ -61011,8 +76528,8 @@ var ts;
                 }
                 if (source)
                     setSourceFile(source);
-                if (node.kind !== 300
-                    && (emitFlags & 32) === 0
+                if (node.kind !== 300 /* NotEmittedStatement */
+                    && (emitFlags & 32 /* NoTrailingSourceMap */) === 0
                     && end >= 0) {
                     emitPos(end);
                 }
@@ -61020,28 +76537,41 @@ var ts;
                     setSourceFile(oldSource);
             }
         }
+        /**
+         * Emits a token of a node with possible leading and trailing source maps.
+         *
+         * @param node The node containing the token.
+         * @param token The token to emit.
+         * @param tokenStartPos The start pos of the token.
+         * @param emitCallback The callback used to emit the token.
+         */
         function emitTokenWithSourceMap(node, token, writer, tokenPos, emitCallback) {
             if (disabled || ts.isInJsonFile(node)) {
                 return emitCallback(token, writer, tokenPos);
             }
             var emitNode = node && node.emitNode;
-            var emitFlags = emitNode && emitNode.flags || 0;
+            var emitFlags = emitNode && emitNode.flags || 0 /* None */;
             var range = emitNode && emitNode.tokenSourceMapRanges && emitNode.tokenSourceMapRanges[token];
             tokenPos = skipSourceTrivia(range ? range.pos : tokenPos);
-            if ((emitFlags & 128) === 0 && tokenPos >= 0) {
+            if ((emitFlags & 128 /* NoTokenLeadingSourceMaps */) === 0 && tokenPos >= 0) {
                 emitPos(tokenPos);
             }
             tokenPos = emitCallback(token, writer, tokenPos);
             if (range)
                 tokenPos = range.end;
-            if ((emitFlags & 256) === 0 && tokenPos >= 0) {
+            if ((emitFlags & 256 /* NoTokenTrailingSourceMaps */) === 0 && tokenPos >= 0) {
                 emitPos(tokenPos);
             }
             return tokenPos;
         }
         function isJsonSourceMapSource(sourceFile) {
-            return ts.fileExtensionIs(sourceFile.fileName, ".json");
+            return ts.fileExtensionIs(sourceFile.fileName, ".json" /* Json */);
         }
+        /**
+         * Set the current source file.
+         *
+         * @param sourceFile The source file.
+         */
         function setSourceFile(sourceFile) {
             if (disabled) {
                 return;
@@ -61051,38 +76581,42 @@ var ts;
             if (isJsonSourceMapSource(sourceFile)) {
                 return;
             }
+            // Add the file to tsFilePaths
+            // If sourceroot option: Use the relative path corresponding to the common directory path
+            // otherwise source locations relative to map file location
             var sourcesDirectoryPath = compilerOptions.sourceRoot ? host.getCommonSourceDirectory() : sourceMapDir;
-            var source = ts.getRelativePathToDirectoryOrUrl(sourcesDirectoryPath, currentSource.fileName, host.getCurrentDirectory(), host.getCanonicalFileName, true);
+            var source = ts.getRelativePathToDirectoryOrUrl(sourcesDirectoryPath, currentSource.fileName, host.getCurrentDirectory(), host.getCanonicalFileName, 
+            /*isAbsolutePathAnUrl*/ true);
             sourceMapSourceIndex = sourceMapData.sourceMapSources.indexOf(source);
             if (sourceMapSourceIndex === -1) {
                 sourceMapSourceIndex = sourceMapData.sourceMapSources.length;
                 sourceMapData.sourceMapSources.push(source);
+                // The one that can be used from program to get the actual source file
                 sourceMapData.inputSourceFileNames.push(currentSource.fileName);
                 if (compilerOptions.inlineSources) {
                     sourceMapData.sourceMapSourcesContent.push(currentSource.text);
                 }
             }
         }
+        /**
+         * Gets the text for the source map.
+         */
         function getText() {
             if (disabled || isJsonSourceMapSource(currentSource)) {
-                return undefined;
+                return undefined; // TODO: GH#18217
             }
             encodeLastRecordedSourceMapSpan();
-            return JSON.stringify({
-                version: 3,
-                file: sourceMapData.sourceMapFile,
-                sourceRoot: sourceMapData.sourceMapSourceRoot,
-                sources: sourceMapData.sourceMapSources,
-                names: sourceMapData.sourceMapNames,
-                mappings: sourceMapData.sourceMapMappings,
-                sourcesContent: sourceMapData.sourceMapSourcesContent,
-            });
+            return JSON.stringify(generateMap());
         }
+        /**
+         * Gets the SourceMappingURL for the source map.
+         */
         function getSourceMappingURL() {
             if (disabled || isJsonSourceMapSource(currentSource)) {
-                return undefined;
+                return undefined; // TODO: GH#18217
             }
             if (compilerOptions.inlineSourceMap) {
+                // Encode the sourceMap into the sourceMap url
                 var base64SourceMapText = ts.base64encode(ts.sys, getText());
                 return sourceMapData.jsSourceMappingURL = "data:application/json;base64," + base64SourceMapText;
             }
@@ -61100,17 +76634,24 @@ var ts;
         throw TypeError(inValue + ": not a 64 based value");
     }
     function base64VLQFormatEncode(inValue) {
+        // Add a new least significant bit that has the sign of the value.
+        // if negative number the least significant bit that gets added to the number has value 1
+        // else least significant bit value that gets added is 0
+        // eg. -1 changes to binary : 01 [1] => 3
+        //     +1 changes to binary : 01 [0] => 2
         if (inValue < 0) {
             inValue = ((-inValue) << 1) + 1;
         }
         else {
             inValue = inValue << 1;
         }
+        // Encode 5 bits at a time starting from least significant bits
         var encodedStr = "";
         do {
-            var currentDigit = inValue & 31;
+            var currentDigit = inValue & 31; // 11111
             inValue = inValue >> 5;
             if (inValue > 0) {
+                // There are still more digits to decode, set the msb (6th bit)
                 currentDigit = currentDigit | 32;
             }
             encodedStr = encodedStr + base64FormatEncode(currentDigit);
@@ -61118,6 +76659,7 @@ var ts;
         return encodedStr;
     }
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     function createCommentWriter(printerOptions, emitPos) {
@@ -61153,18 +76695,24 @@ var ts;
                 var emitFlags = emitNode && emitNode.flags || 0;
                 var _a = emitNode && emitNode.commentRange || node, pos = _a.pos, end = _a.end;
                 if ((pos < 0 && end < 0) || (pos === end)) {
+                    // Both pos and end are synthesized, so just emit the node without comments.
                     emitNodeWithSynthesizedComments(hint, node, emitNode, emitFlags, emitCallback);
                 }
                 else {
                     if (extendedDiagnostics) {
                         ts.performance.mark("preEmitNodeWithComment");
                     }
-                    var isEmittedNode = node.kind !== 300;
-                    var skipLeadingComments = pos < 0 || (emitFlags & 512) !== 0 || node.kind === 10;
-                    var skipTrailingComments = end < 0 || (emitFlags & 1024) !== 0 || node.kind === 10;
+                    var isEmittedNode = node.kind !== 300 /* NotEmittedStatement */;
+                    // We have to explicitly check that the node is JsxText because if the compilerOptions.jsx is "preserve" we will not do any transformation.
+                    // It is expensive to walk entire tree just to set one kind of node to have no comments.
+                    var skipLeadingComments = pos < 0 || (emitFlags & 512 /* NoLeadingComments */) !== 0 || node.kind === 10 /* JsxText */;
+                    var skipTrailingComments = end < 0 || (emitFlags & 1024 /* NoTrailingComments */) !== 0 || node.kind === 10 /* JsxText */;
+                    // Emit leading comments if the position is not synthesized and the node
+                    // has not opted out from emitting leading comments.
                     if (!skipLeadingComments) {
                         emitLeadingComments(pos, isEmittedNode);
                     }
+                    // Save current container state on the stack.
                     var savedContainerPos = containerPos;
                     var savedContainerEnd = containerEnd;
                     var savedDeclarationListContainerEnd = declarationListContainerEnd;
@@ -61173,7 +76721,9 @@ var ts;
                     }
                     if (!skipTrailingComments) {
                         containerEnd = end;
-                        if (node.kind === 233) {
+                        // To avoid invalid comment emit in a down-level binding pattern, we
+                        // keep track of the last declaration list container's end
+                        if (node.kind === 233 /* VariableDeclarationList */) {
                             declarationListContainerEnd = end;
                         }
                     }
@@ -61184,9 +76734,12 @@ var ts;
                     if (extendedDiagnostics) {
                         ts.performance.mark("postEmitNodeWithComment");
                     }
+                    // Restore previous container state.
                     containerPos = savedContainerPos;
                     containerEnd = savedContainerEnd;
                     declarationListContainerEnd = savedDeclarationListContainerEnd;
+                    // Emit trailing comments if the position is not synthesized and the node
+                    // has not opted out from emitting leading comments and is an emitted node.
                     if (!skipTrailingComments && isEmittedNode) {
                         emitTrailingComments(end);
                     }
@@ -61220,11 +76773,11 @@ var ts;
             }
         }
         function emitLeadingSynthesizedComment(comment) {
-            if (comment.kind === 2) {
+            if (comment.kind === 2 /* SingleLineCommentTrivia */) {
                 writer.writeLine();
             }
             writeSynthesizedComment(comment);
-            if (comment.hasTrailingNewLine || comment.kind === 2) {
+            if (comment.hasTrailingNewLine || comment.kind === 2 /* SingleLineCommentTrivia */) {
                 writer.writeLine();
             }
             else {
@@ -61242,16 +76795,16 @@ var ts;
         }
         function writeSynthesizedComment(comment) {
             var text = formatSynthesizedComment(comment);
-            var lineMap = comment.kind === 3 ? ts.computeLineStarts(text) : undefined;
+            var lineMap = comment.kind === 3 /* MultiLineCommentTrivia */ ? ts.computeLineStarts(text) : undefined;
             ts.writeCommentRange(text, lineMap, writer, 0, text.length, newLine);
         }
         function formatSynthesizedComment(comment) {
-            return comment.kind === 3
+            return comment.kind === 3 /* MultiLineCommentTrivia */
                 ? "/*" + comment.text + "*/"
                 : "//" + comment.text;
         }
         function emitNodeWithNestedComments(hint, node, emitFlags, emitCallback) {
-            if (emitFlags & 2048) {
+            if (emitFlags & 2048 /* NoNestedComments */) {
                 disabled = true;
                 emitCallback(hint, node);
                 disabled = false;
@@ -61266,15 +76819,15 @@ var ts;
             }
             var pos = detachedRange.pos, end = detachedRange.end;
             var emitFlags = ts.getEmitFlags(node);
-            var skipLeadingComments = pos < 0 || (emitFlags & 512) !== 0;
-            var skipTrailingComments = disabled || end < 0 || (emitFlags & 1024) !== 0;
+            var skipLeadingComments = pos < 0 || (emitFlags & 512 /* NoLeadingComments */) !== 0;
+            var skipTrailingComments = disabled || end < 0 || (emitFlags & 1024 /* NoTrailingComments */) !== 0;
             if (!skipLeadingComments) {
                 emitDetachedCommentsAndUpdateCommentsInfo(detachedRange);
             }
             if (extendedDiagnostics) {
                 ts.performance.measure("commentTime", "preEmitBodyWithDetachedComments");
             }
-            if (emitFlags & 2048 && !disabled) {
+            if (emitFlags & 2048 /* NoNestedComments */ && !disabled) {
                 disabled = true;
                 emitCallback(node);
                 disabled = false;
@@ -61286,7 +76839,7 @@ var ts;
                 ts.performance.mark("beginEmitBodyWithDetachedCommetns");
             }
             if (!skipTrailingComments) {
-                emitLeadingComments(detachedRange.end, true);
+                emitLeadingComments(detachedRange.end, /*isEmittedNode*/ true);
                 if (hasWrittenComment && !writer.isAtStartOfLine()) {
                     writer.writeLine();
                 }
@@ -61301,6 +76854,14 @@ var ts;
                 forEachLeadingCommentToEmit(pos, emitLeadingComment);
             }
             else if (pos === 0) {
+                // If the node will not be emitted in JS, remove all the comments(normal, pinned and ///) associated with the node,
+                // unless it is a triple slash comment at the top of the file.
+                // For Example:
+                //      /// <reference-path ...>
+                //      declare var x;
+                //      /// <reference-path ...>
+                //      interface F {}
+                //  The first /// will NOT be removed while the second one will be removed even though both node will not be emitted
                 forEachLeadingCommentToEmit(pos, emitTripleSlashLeadingComment);
             }
         }
@@ -61322,6 +76883,7 @@ var ts;
                 ts.emitNewLineBeforeLeadingCommentOfPosition(currentLineMap, writer, rangePos, commentPos);
                 hasWrittenComment = true;
             }
+            // Leading comments are emitted at /*leading comment1 */space/*leading comment*/space
             if (emitPos)
                 emitPos(commentPos);
             ts.writeCommentRange(currentText, currentLineMap, writer, commentPos, commentEnd, newLine);
@@ -61330,7 +76892,7 @@ var ts;
             if (hasTrailingNewLine) {
                 writer.writeLine();
             }
-            else if (kind === 3) {
+            else if (kind === 3 /* MultiLineCommentTrivia */) {
                 writer.write(" ");
             }
         }
@@ -61338,7 +76900,7 @@ var ts;
             if (disabled || pos === -1) {
                 return;
             }
-            emitLeadingComments(pos, true);
+            emitLeadingComments(pos, /*isEmittedNode*/ true);
         }
         function emitTrailingComments(pos) {
             forEachTrailingCommentToEmit(pos, emitTrailingComment);
@@ -61346,6 +76908,7 @@ var ts;
         function emitTrailingComment(commentPos, commentEnd, _kind, hasTrailingNewLine) {
             if (!shouldWriteComment(currentText, commentPos))
                 return;
+            // trailing comments are emitted at space/*trailing comment1 */space/*trailing comment2*/
             if (!writer.isAtStartOfLine()) {
                 writer.write(" ");
             }
@@ -61371,6 +76934,7 @@ var ts;
             }
         }
         function emitTrailingCommentOfPosition(commentPos, commentEnd, _kind, hasTrailingNewLine) {
+            // trailing comments of a position are emitted at /*trailing comment1 */space/*trailing comment*/space
             if (emitPos)
                 emitPos(commentPos);
             ts.writeCommentRange(currentText, currentLineMap, writer, commentPos, commentEnd, newLine);
@@ -61384,16 +76948,18 @@ var ts;
             }
         }
         function forEachLeadingCommentToEmit(pos, cb) {
+            // Emit the leading comments only if the container's pos doesn't match because the container should take care of emitting these comments
             if (containerPos === -1 || pos !== containerPos) {
                 if (hasDetachedComments(pos)) {
                     forEachLeadingCommentWithoutDetachedComments(cb);
                 }
                 else {
-                    ts.forEachLeadingCommentRange(currentText, pos, cb, pos);
+                    ts.forEachLeadingCommentRange(currentText, pos, cb, /*state*/ pos);
                 }
             }
         }
         function forEachTrailingCommentToEmit(end, cb) {
+            // Emit the trailing comments only if the container's end doesn't match because the container should take care of emitting these comments
             if (containerEnd === -1 || (end !== containerEnd && end !== declarationListContainerEnd)) {
                 ts.forEachTrailingCommentRange(currentText, end, cb);
             }
@@ -61417,6 +76983,7 @@ var ts;
             return detachedCommentsInfo !== undefined && ts.last(detachedCommentsInfo).nodePos === pos;
         }
         function forEachLeadingCommentWithoutDetachedComments(cb) {
+            // get the leading comments from detachedPos
             var pos = ts.last(detachedCommentsInfo).detachedCommentEndPos;
             if (detachedCommentsInfo.length - 1) {
                 detachedCommentsInfo.pop();
@@ -61424,7 +76991,7 @@ var ts;
             else {
                 detachedCommentsInfo = undefined;
             }
-            ts.forEachLeadingCommentRange(currentText, pos, cb, pos);
+            ts.forEachLeadingCommentRange(currentText, pos, cb, /*state*/ pos);
         }
         function emitDetachedCommentsAndUpdateCommentsInfo(range) {
             var currentDetachedCommentInfo = ts.emitDetachedComments(currentText, currentLineMap, writer, writeComment, range, newLine, disabled);
@@ -61446,6 +77013,11 @@ var ts;
             if (emitPos)
                 emitPos(commentEnd);
         }
+        /**
+         * Determine if the given comment is a triple-slash
+         *
+         * @return true if the comment is a triple-slash comment else false
+         */
         function isTripleSlashComment(commentPos, commentEnd) {
             return ts.isRecognizedTripleSlashComment(currentText, commentPos, commentEnd);
         }
@@ -61456,6 +77028,16 @@ var ts;
 (function (ts) {
     var infoExtension = ".tsbundleinfo";
     var brackets = createBracketsMap();
+    /*@internal*/
+    /**
+     * Iterates over the source files that are expected to have an emit output.
+     *
+     * @param host An EmitHost.
+     * @param action The action to execute.
+     * @param sourceFilesOrTargetSourceFile
+     *   If an array, the full list of source files to emit.
+     *   Else, calls `getSourceFilesToEmit` with the (optional) target source file to determine the list of source files to emit.
+     */
     function forEachEmittedFile(host, action, sourceFilesOrTargetSourceFile, emitOnlyDtsFiles) {
         if (emitOnlyDtsFiles === void 0) { emitOnlyDtsFiles = false; }
         var sourceFiles = ts.isArray(sourceFilesOrTargetSourceFile) ? sourceFilesOrTargetSourceFile : ts.getSourceFilesToEmit(host, sourceFilesOrTargetSourceFile);
@@ -61480,12 +77062,13 @@ var ts;
         }
     }
     ts.forEachEmittedFile = forEachEmittedFile;
+    /*@internal*/
     function getOutputPathsFor(sourceFile, host, forceDtsPaths) {
         var options = host.getCompilerOptions();
-        if (sourceFile.kind === 275) {
+        if (sourceFile.kind === 275 /* Bundle */) {
             var jsFilePath = options.outFile || options.out;
             var sourceMapFilePath = getSourceMapFilePath(jsFilePath, options);
-            var declarationFilePath = (forceDtsPaths || options.declaration) ? ts.removeFileExtension(jsFilePath) + ".d.ts" : undefined;
+            var declarationFilePath = (forceDtsPaths || options.declaration) ? ts.removeFileExtension(jsFilePath) + ".d.ts" /* Dts */ : undefined;
             var declarationMapPath = ts.getAreDeclarationMapsEnabled(options) ? declarationFilePath + ".map" : undefined;
             var bundleInfoPath = options.references && jsFilePath ? (ts.removeFileExtension(jsFilePath) + infoExtension) : undefined;
             return { jsFilePath: jsFilePath, sourceMapFilePath: sourceMapFilePath, declarationFilePath: declarationFilePath, declarationMapPath: declarationMapPath, bundleInfoPath: bundleInfoPath };
@@ -61493,6 +77076,7 @@ var ts;
         else {
             var jsFilePath = ts.getOwnEmitOutputFilePath(sourceFile, host, getOutputExtension(sourceFile, options));
             var sourceMapFilePath = ts.isJsonSourceFile(sourceFile) ? undefined : getSourceMapFilePath(jsFilePath, options);
+            // For legacy reasons (ie, we have baselines capturing the behavior), js files don't report a .d.ts output path - this would only matter if `declaration` and `allowJs` were both on, which is currently an error
             var isJs = ts.isSourceFileJavaScript(sourceFile);
             var declarationFilePath = ((forceDtsPaths || options.declaration) && !isJs) ? ts.getDeclarationEmitOutputFilePath(sourceFile, host) : undefined;
             var declarationMapPath = ts.getAreDeclarationMapsEnabled(options) ? declarationFilePath + ".map" : undefined;
@@ -61509,23 +77093,30 @@ var ts;
             totalLength: -1
         };
     }
+    // JavaScript files are always LanguageVariant.JSX, as JSX syntax is allowed in .js files also.
+    // So for JavaScript files, '.jsx' is only emitted if the input was '.jsx', and JsxEmit.Preserve.
+    // For TypeScript, the only time to emit with a '.jsx' extension, is on JSX input, and JsxEmit.Preserve
+    /* @internal */
     function getOutputExtension(sourceFile, options) {
         if (ts.isJsonSourceFile(sourceFile)) {
-            return ".json";
+            return ".json" /* Json */;
         }
-        if (options.jsx === 1) {
+        if (options.jsx === 1 /* Preserve */) {
             if (ts.isSourceFileJavaScript(sourceFile)) {
-                if (ts.fileExtensionIs(sourceFile.fileName, ".jsx")) {
-                    return ".jsx";
+                if (ts.fileExtensionIs(sourceFile.fileName, ".jsx" /* Jsx */)) {
+                    return ".jsx" /* Jsx */;
                 }
             }
-            else if (sourceFile.languageVariant === 1) {
-                return ".jsx";
+            else if (sourceFile.languageVariant === 1 /* JSX */) {
+                // TypeScript source file preserving JSX syntax
+                return ".jsx" /* Jsx */;
             }
         }
-        return ".js";
+        return ".js" /* Js */;
     }
     ts.getOutputExtension = getOutputExtension;
+    /*@internal*/
+    // targetSourceFile is when users only want one file in entire project to be emitted. This is used in compileOnSave feature
     function emitFiles(resolver, host, targetSourceFile, emitOnlyDtsFiles, transformers, declarationTransformers) {
         var compilerOptions = host.getCompilerOptions();
         var sourceMapDataList = (compilerOptions.sourceMap || compilerOptions.inlineSourceMap || ts.getAreDeclarationMapsEnabled(compilerOptions)) ? [] : undefined;
@@ -61542,6 +77133,7 @@ var ts;
         });
         var bundleInfo = createDefaultBundleInfo();
         var emitSkipped = false;
+        // Emit each output file
         ts.performance.mark("beforePrint");
         forEachEmittedFile(host, emitSourceFileOrBundle, ts.getSourceFilesToEmit(host, targetSourceFile), emitOnlyDtsFiles);
         ts.performance.measure("printTime", "beforePrint");
@@ -61571,6 +77163,7 @@ var ts;
             }
         }
         function emitJsFileOrBundle(sourceFileOrBundle, jsFilePath, sourceMapFilePath, bundleInfoPath) {
+            // Make sure not to write js file and source map file if any of them cannot be written
             if (host.isEmitBlocked(jsFilePath) || compilerOptions.noEmit || compilerOptions.emitDeclarationOnly) {
                 emitSkipped = true;
                 return;
@@ -61578,18 +77171,25 @@ var ts;
             if (emitOnlyDtsFiles) {
                 return;
             }
-            var transform = ts.transformNodes(resolver, host, compilerOptions, [sourceFileOrBundle], transformers, false);
+            // Transform the source files
+            var transform = ts.transformNodes(resolver, host, compilerOptions, [sourceFileOrBundle], transformers, /*allowDtsFiles*/ false);
+            // Create a printer to print the nodes
             var printer = createPrinter(__assign({}, compilerOptions, { noEmitHelpers: compilerOptions.noEmitHelpers }), {
+                // resolver hooks
                 hasGlobalName: resolver.hasGlobalName,
+                // transform hooks
                 onEmitNode: transform.emitNodeWithNotification,
                 substituteNode: transform.substituteNode,
+                // sourcemap hooks
                 onEmitSourceMapOfNode: sourceMap.emitNodeWithSourceMap,
                 onEmitSourceMapOfToken: sourceMap.emitTokenWithSourceMap,
                 onEmitSourceMapOfPosition: sourceMap.emitPos,
+                // emitter hooks
                 onSetSourceFile: setSourceFile,
             });
             ts.Debug.assert(transform.transformed.length === 1, "Should only see one output from the transform");
             printSourceFileOrBundle(jsFilePath, sourceMapFilePath, transform.transformed[0], bundleInfoPath, printer, sourceMap);
+            // Clean up emit nodes on parse tree
             transform.dispose();
         }
         function emitDeclarationFileOrBundle(sourceFileOrBundle, declarationFilePath, declarationMapPath) {
@@ -61597,9 +77197,10 @@ var ts;
                 return;
             }
             var sourceFiles = ts.isSourceFile(sourceFileOrBundle) ? [sourceFileOrBundle] : sourceFileOrBundle.sourceFiles;
+            // Setup and perform the transformation to retrieve declarations from the input files
             var nonJsFiles = ts.filter(sourceFiles, ts.isSourceFileNotJavaScript);
             var inputListOrBundle = (compilerOptions.outFile || compilerOptions.out) ? [ts.createBundle(nonJsFiles, !ts.isSourceFile(sourceFileOrBundle) ? sourceFileOrBundle.prepends : undefined)] : nonJsFiles;
-            var declarationTransform = ts.transformNodes(resolver, host, compilerOptions, inputListOrBundle, ts.concatenate([ts.transformDeclarations], declarationTransformers), false);
+            var declarationTransform = ts.transformNodes(resolver, host, compilerOptions, inputListOrBundle, ts.concatenate([ts.transformDeclarations], declarationTransformers), /*allowDtsFiles*/ false);
             if (ts.length(declarationTransform.diagnostics)) {
                 for (var _a = 0, _b = declarationTransform.diagnostics; _a < _b.length; _a++) {
                     var diagnostic = _b[_a];
@@ -61607,11 +77208,14 @@ var ts;
                 }
             }
             var declarationPrinter = createPrinter(__assign({}, compilerOptions, { onlyPrintJsDocStyle: true, noEmitHelpers: true }), {
+                // resolver hooks
                 hasGlobalName: resolver.hasGlobalName,
+                // sourcemap hooks
                 onEmitSourceMapOfNode: declarationSourceMap.emitNodeWithSourceMap,
                 onEmitSourceMapOfToken: declarationSourceMap.emitTokenWithSourceMap,
                 onEmitSourceMapOfPosition: declarationSourceMap.emitPos,
                 onSetSourceFile: setSourceFileForDeclarationSourceMaps,
+                // transform hooks
                 onEmitNode: declarationTransform.emitNodeWithNotification,
                 substituteNode: declarationTransform.substituteNode,
             });
@@ -61619,13 +77223,13 @@ var ts;
             emitSkipped = emitSkipped || declBlocked;
             if (!declBlocked || emitOnlyDtsFiles) {
                 ts.Debug.assert(declarationTransform.transformed.length === 1, "Should only see one output from the decl transform");
-                printSourceFileOrBundle(declarationFilePath, declarationMapPath, declarationTransform.transformed[0], undefined, declarationPrinter, declarationSourceMap);
+                printSourceFileOrBundle(declarationFilePath, declarationMapPath, declarationTransform.transformed[0], /* bundleInfopath*/ undefined, declarationPrinter, declarationSourceMap);
             }
             declarationTransform.dispose();
         }
         function printSourceFileOrBundle(jsFilePath, sourceMapFilePath, sourceFileOrBundle, bundleInfoPath, printer, mapRecorder) {
-            var bundle = sourceFileOrBundle.kind === 275 ? sourceFileOrBundle : undefined;
-            var sourceFile = sourceFileOrBundle.kind === 274 ? sourceFileOrBundle : undefined;
+            var bundle = sourceFileOrBundle.kind === 275 /* Bundle */ ? sourceFileOrBundle : undefined;
+            var sourceFile = sourceFileOrBundle.kind === 274 /* SourceFile */ ? sourceFileOrBundle : undefined;
             var sourceFiles = bundle ? bundle.sourceFiles : [sourceFile];
             mapRecorder.initialize(jsFilePath, sourceMapFilePath || "", sourceFileOrBundle, sourceMapDataList);
             if (bundle) {
@@ -61637,16 +77241,20 @@ var ts;
             writer.writeLine();
             var sourceMappingURL = mapRecorder.getSourceMappingURL();
             if (sourceMappingURL) {
-                writer.write("//# " + "sourceMappingURL" + "=" + sourceMappingURL);
+                writer.write("//# " + "sourceMappingURL" + "=" + sourceMappingURL); // Sometimes tools can sometimes see this line as a source mapping url comment
             }
+            // Write the source map
             if (sourceMapFilePath) {
-                ts.writeFile(host, emitterDiagnostics, sourceMapFilePath, mapRecorder.getText(), false, sourceFiles);
+                ts.writeFile(host, emitterDiagnostics, sourceMapFilePath, mapRecorder.getText(), /*writeByteOrderMark*/ false, sourceFiles);
             }
+            // Write the output file
             ts.writeFile(host, emitterDiagnostics, jsFilePath, writer.getText(), !!compilerOptions.emitBOM, sourceFiles);
+            // Write bundled offset information if applicable
             if (bundleInfoPath) {
                 bundleInfo.totalLength = writer.getTextPos();
-                ts.writeFile(host, emitterDiagnostics, bundleInfoPath, JSON.stringify(bundleInfo, undefined, 2), false);
+                ts.writeFile(host, emitterDiagnostics, bundleInfoPath, JSON.stringify(bundleInfo, undefined, 2), /*writeByteOrderMark*/ false);
             }
+            // Reset state
             mapRecorder.reset();
             writer.clear();
             bundleInfo = createDefaultBundleInfo();
@@ -61674,13 +77282,13 @@ var ts;
         var comments = ts.createCommentWriter(printerOptions, onEmitSourceMapOfPosition);
         var emitNodeWithComments = comments.emitNodeWithComments, emitBodyWithDetachedComments = comments.emitBodyWithDetachedComments, emitTrailingCommentsOfPosition = comments.emitTrailingCommentsOfPosition, emitLeadingCommentsOfPosition = comments.emitLeadingCommentsOfPosition;
         var currentSourceFile;
-        var nodeIdToGeneratedName;
-        var autoGeneratedIdToGeneratedName;
-        var generatedNames;
-        var tempFlagsStack;
-        var tempFlags;
-        var reservedNamesStack;
-        var reservedNames;
+        var nodeIdToGeneratedName; // Map of generated names for specific nodes.
+        var autoGeneratedIdToGeneratedName; // Map of generated names for temp and loop variables.
+        var generatedNames; // Set of names generated by the NameGenerator.
+        var tempFlagsStack; // Stack of enclosing name generation scopes.
+        var tempFlags; // TempFlags for the current name generation scope.
+        var reservedNamesStack; // Stack of TempFlags reserved in enclosing name generation scopes.
+        var reservedNames; // TempFlags to reserve in nested name generation scopes.
         var writer;
         var ownWriter;
         var write = writeBase;
@@ -61697,10 +77305,12 @@ var ts;
         var isOwnFileEmit;
         reset();
         return {
+            // public API
             printNode: printNode,
             printList: printList,
             printFile: printFile,
             printBundle: printBundle,
+            // internal API
             writeNode: writeNode,
             writeList: writeList,
             writeFile: writeFile,
@@ -61708,20 +77318,20 @@ var ts;
         };
         function printNode(hint, node, sourceFile) {
             switch (hint) {
-                case 0:
+                case 0 /* SourceFile */:
                     ts.Debug.assert(ts.isSourceFile(node), "Expected a SourceFile node.");
                     break;
-                case 2:
+                case 2 /* IdentifierName */:
                     ts.Debug.assert(ts.isIdentifier(node), "Expected an Identifier node.");
                     break;
-                case 1:
+                case 1 /* Expression */:
                     ts.Debug.assert(ts.isExpression(node), "Expected an Expression node.");
                     break;
             }
             switch (node.kind) {
-                case 274: return printFile(node);
-                case 275: return printBundle(node);
-                case 276: return printUnparsedSource(node);
+                case 274 /* SourceFile */: return printFile(node);
+                case 275 /* Bundle */: return printBundle(node);
+                case 276 /* UnparsedSource */: return printUnparsedSource(node);
             }
             writeNode(hint, node, sourceFile, beginPrint());
             return endPrint();
@@ -61769,7 +77379,7 @@ var ts;
             emitSyntheticTripleSlashReferencesIfNeeded(bundle);
             for (var _a = 0, _b = bundle.prepends; _a < _b.length; _a++) {
                 var prepend = _b[_a];
-                print(4, prepend, undefined);
+                print(4 /* Unspecified */, prepend, /*sourceFile*/ undefined);
                 writeLine();
             }
             if (bundleInfo) {
@@ -61777,7 +77387,7 @@ var ts;
             }
             for (var _c = 0, _d = bundle.sourceFiles; _c < _d.length; _c++) {
                 var sourceFile = _d[_c];
-                print(0, sourceFile, sourceFile);
+                print(0 /* SourceFile */, sourceFile, sourceFile);
             }
             reset();
             writer = previousWriter;
@@ -61785,7 +77395,7 @@ var ts;
         function writeUnparsedSource(unparsed, output) {
             var previousWriter = writer;
             setWriter(output);
-            print(4, unparsed, undefined);
+            print(4 /* Unspecified */, unparsed, /*sourceFile*/ undefined);
             reset();
             writer = previousWriter;
         }
@@ -61795,7 +77405,7 @@ var ts;
             setWriter(output);
             emitShebangIfNeeded(sourceFile);
             emitPrologueDirectivesIfNeeded(sourceFile);
-            print(0, sourceFile, sourceFile);
+            print(0 /* SourceFile */, sourceFile, sourceFile);
             reset();
             writer = previousWriter;
         }
@@ -61811,7 +77421,7 @@ var ts;
             if (sourceFile) {
                 setSourceFile(sourceFile);
             }
-            var pipelinePhase = getPipelinePhase(0, hint);
+            var pipelinePhase = getPipelinePhase(0 /* Notification */, hint);
             pipelinePhase(hint, node);
         }
         function setSourceFile(sourceFile) {
@@ -61822,7 +77432,7 @@ var ts;
             }
         }
         function setWriter(output) {
-            writer = output;
+            writer = output; // TODO: GH#18217
             comments.setWriter(output);
         }
         function reset() {
@@ -61830,45 +77440,47 @@ var ts;
             autoGeneratedIdToGeneratedName = [];
             generatedNames = ts.createMap();
             tempFlagsStack = [];
-            tempFlags = 0;
+            tempFlags = 0 /* Auto */;
             reservedNamesStack = [];
             comments.reset();
-            setWriter(undefined);
+            setWriter(/*output*/ undefined);
         }
         function emit(node) {
             if (!node)
                 return;
-            var pipelinePhase = getPipelinePhase(0, 4);
-            pipelinePhase(4, node);
+            var pipelinePhase = getPipelinePhase(0 /* Notification */, 4 /* Unspecified */);
+            pipelinePhase(4 /* Unspecified */, node);
         }
         function emitIdentifierName(node) {
             if (!node)
                 return;
-            var pipelinePhase = getPipelinePhase(0, 2);
-            pipelinePhase(2, node);
+            var pipelinePhase = getPipelinePhase(0 /* Notification */, 2 /* IdentifierName */);
+            pipelinePhase(2 /* IdentifierName */, node);
         }
         function emitExpression(node) {
             if (!node)
                 return;
-            var pipelinePhase = getPipelinePhase(0, 1);
-            pipelinePhase(1, node);
+            var pipelinePhase = getPipelinePhase(0 /* Notification */, 1 /* Expression */);
+            pipelinePhase(1 /* Expression */, node);
         }
         function getPipelinePhase(phase, hint) {
             switch (phase) {
-                case 0:
+                case 0 /* Notification */:
                     if (onEmitNode) {
                         return pipelineEmitWithNotification;
                     }
-                case 1:
-                    if (emitNodeWithComments && hint !== 0) {
+                // falls through
+                case 1 /* Comments */:
+                    if (emitNodeWithComments && hint !== 0 /* SourceFile */) {
                         return pipelineEmitWithComments;
                     }
                     return pipelineEmitWithoutComments;
-                case 2:
-                    if (onEmitSourceMapOfNode && hint !== 0 && hint !== 2) {
+                case 2 /* SourceMaps */:
+                    if (onEmitSourceMapOfNode && hint !== 0 /* SourceFile */ && hint !== 2 /* IdentifierName */) {
                         return pipelineEmitWithSourceMap;
                     }
-                case 3:
+                // falls through
+                case 3 /* Emit */:
                     return pipelineEmitWithHint;
                 default:
                     return ts.Debug.assertNever(phase, "Unexpected value for PipelinePhase: " + phase);
@@ -61878,341 +77490,365 @@ var ts;
             return getPipelinePhase(currentPhase + 1, hint);
         }
         function pipelineEmitWithNotification(hint, node) {
-            ts.Debug.assertDefined(onEmitNode)(hint, node, getNextPipelinePhase(0, hint));
+            ts.Debug.assertDefined(onEmitNode)(hint, node, getNextPipelinePhase(0 /* Notification */, hint));
         }
         function pipelineEmitWithComments(hint, node) {
             ts.Debug.assertDefined(emitNodeWithComments);
-            ts.Debug.assert(hint !== 0);
-            emitNodeWithComments(hint, trySubstituteNode(hint, node), getNextPipelinePhase(1, hint));
+            ts.Debug.assert(hint !== 0 /* SourceFile */);
+            emitNodeWithComments(hint, trySubstituteNode(hint, node), getNextPipelinePhase(1 /* Comments */, hint));
         }
         function pipelineEmitWithoutComments(hint, node) {
-            var pipelinePhase = getNextPipelinePhase(1, hint);
+            var pipelinePhase = getNextPipelinePhase(1 /* Comments */, hint);
             pipelinePhase(hint, trySubstituteNode(hint, node));
         }
         function pipelineEmitWithSourceMap(hint, node) {
-            ts.Debug.assert(hint !== 0 && hint !== 2);
+            ts.Debug.assert(hint !== 0 /* SourceFile */ && hint !== 2 /* IdentifierName */);
             ts.Debug.assertDefined(onEmitSourceMapOfNode)(hint, node, pipelineEmitWithHint);
         }
         function pipelineEmitWithHint(hint, node) {
-            if (hint === 0)
+            if (hint === 0 /* SourceFile */)
                 return emitSourceFile(ts.cast(node, ts.isSourceFile));
-            if (hint === 2)
+            if (hint === 2 /* IdentifierName */)
                 return emitIdentifier(ts.cast(node, ts.isIdentifier));
-            if (hint === 3)
+            if (hint === 3 /* MappedTypeParameter */)
                 return emitMappedTypeParameter(ts.cast(node, ts.isTypeParameterDeclaration));
-            if (hint === 4) {
+            if (hint === 4 /* Unspecified */) {
                 if (ts.isKeyword(node.kind))
                     return writeTokenNode(node, writeKeyword);
                 switch (node.kind) {
-                    case 14:
-                    case 15:
-                    case 16:
+                    // Pseudo-literals
+                    case 14 /* TemplateHead */:
+                    case 15 /* TemplateMiddle */:
+                    case 16 /* TemplateTail */:
                         return emitLiteral(node);
-                    case 276:
+                    case 276 /* UnparsedSource */:
                         return emitUnparsedSource(node);
-                    case 71:
+                    // Identifiers
+                    case 71 /* Identifier */:
                         return emitIdentifier(node);
-                    case 146:
+                    // Parse tree nodes
+                    // Names
+                    case 146 /* QualifiedName */:
                         return emitQualifiedName(node);
-                    case 147:
+                    case 147 /* ComputedPropertyName */:
                         return emitComputedPropertyName(node);
-                    case 148:
+                    // Signature elements
+                    case 148 /* TypeParameter */:
                         return emitTypeParameter(node);
-                    case 149:
+                    case 149 /* Parameter */:
                         return emitParameter(node);
-                    case 150:
+                    case 150 /* Decorator */:
                         return emitDecorator(node);
-                    case 151:
+                    // Type members
+                    case 151 /* PropertySignature */:
                         return emitPropertySignature(node);
-                    case 152:
+                    case 152 /* PropertyDeclaration */:
                         return emitPropertyDeclaration(node);
-                    case 153:
+                    case 153 /* MethodSignature */:
                         return emitMethodSignature(node);
-                    case 154:
+                    case 154 /* MethodDeclaration */:
                         return emitMethodDeclaration(node);
-                    case 155:
+                    case 155 /* Constructor */:
                         return emitConstructor(node);
-                    case 156:
-                    case 157:
+                    case 156 /* GetAccessor */:
+                    case 157 /* SetAccessor */:
                         return emitAccessorDeclaration(node);
-                    case 158:
+                    case 158 /* CallSignature */:
                         return emitCallSignature(node);
-                    case 159:
+                    case 159 /* ConstructSignature */:
                         return emitConstructSignature(node);
-                    case 160:
+                    case 160 /* IndexSignature */:
                         return emitIndexSignature(node);
-                    case 161:
+                    // Types
+                    case 161 /* TypePredicate */:
                         return emitTypePredicate(node);
-                    case 162:
+                    case 162 /* TypeReference */:
                         return emitTypeReference(node);
-                    case 163:
+                    case 163 /* FunctionType */:
                         return emitFunctionType(node);
-                    case 284:
+                    case 284 /* JSDocFunctionType */:
                         return emitJSDocFunctionType(node);
-                    case 164:
+                    case 164 /* ConstructorType */:
                         return emitConstructorType(node);
-                    case 165:
+                    case 165 /* TypeQuery */:
                         return emitTypeQuery(node);
-                    case 166:
+                    case 166 /* TypeLiteral */:
                         return emitTypeLiteral(node);
-                    case 167:
+                    case 167 /* ArrayType */:
                         return emitArrayType(node);
-                    case 168:
+                    case 168 /* TupleType */:
                         return emitTupleType(node);
-                    case 169:
+                    case 169 /* UnionType */:
                         return emitUnionType(node);
-                    case 170:
+                    case 170 /* IntersectionType */:
                         return emitIntersectionType(node);
-                    case 171:
+                    case 171 /* ConditionalType */:
                         return emitConditionalType(node);
-                    case 172:
+                    case 172 /* InferType */:
                         return emitInferType(node);
-                    case 173:
+                    case 173 /* ParenthesizedType */:
                         return emitParenthesizedType(node);
-                    case 207:
+                    case 207 /* ExpressionWithTypeArguments */:
                         return emitExpressionWithTypeArguments(node);
-                    case 174:
+                    case 174 /* ThisType */:
                         return emitThisType();
-                    case 175:
+                    case 175 /* TypeOperator */:
                         return emitTypeOperator(node);
-                    case 176:
+                    case 176 /* IndexedAccessType */:
                         return emitIndexedAccessType(node);
-                    case 177:
+                    case 177 /* MappedType */:
                         return emitMappedType(node);
-                    case 178:
+                    case 178 /* LiteralType */:
                         return emitLiteralType(node);
-                    case 179:
+                    case 179 /* ImportType */:
                         return emitImportTypeNode(node);
-                    case 279:
+                    case 279 /* JSDocAllType */:
                         write("*");
                         return;
-                    case 280:
+                    case 280 /* JSDocUnknownType */:
                         write("?");
                         return;
-                    case 281:
+                    case 281 /* JSDocNullableType */:
                         return emitJSDocNullableType(node);
-                    case 282:
+                    case 282 /* JSDocNonNullableType */:
                         return emitJSDocNonNullableType(node);
-                    case 283:
+                    case 283 /* JSDocOptionalType */:
                         return emitJSDocOptionalType(node);
-                    case 285:
+                    case 285 /* JSDocVariadicType */:
                         return emitJSDocVariadicType(node);
-                    case 180:
+                    // Binding patterns
+                    case 180 /* ObjectBindingPattern */:
                         return emitObjectBindingPattern(node);
-                    case 181:
+                    case 181 /* ArrayBindingPattern */:
                         return emitArrayBindingPattern(node);
-                    case 182:
+                    case 182 /* BindingElement */:
                         return emitBindingElement(node);
-                    case 211:
+                    // Misc
+                    case 211 /* TemplateSpan */:
                         return emitTemplateSpan(node);
-                    case 212:
+                    case 212 /* SemicolonClassElement */:
                         return emitSemicolonClassElement();
-                    case 213:
+                    // Statements
+                    case 213 /* Block */:
                         return emitBlock(node);
-                    case 214:
+                    case 214 /* VariableStatement */:
                         return emitVariableStatement(node);
-                    case 215:
+                    case 215 /* EmptyStatement */:
                         return emitEmptyStatement();
-                    case 216:
+                    case 216 /* ExpressionStatement */:
                         return emitExpressionStatement(node);
-                    case 217:
+                    case 217 /* IfStatement */:
                         return emitIfStatement(node);
-                    case 218:
+                    case 218 /* DoStatement */:
                         return emitDoStatement(node);
-                    case 219:
+                    case 219 /* WhileStatement */:
                         return emitWhileStatement(node);
-                    case 220:
+                    case 220 /* ForStatement */:
                         return emitForStatement(node);
-                    case 221:
+                    case 221 /* ForInStatement */:
                         return emitForInStatement(node);
-                    case 222:
+                    case 222 /* ForOfStatement */:
                         return emitForOfStatement(node);
-                    case 223:
+                    case 223 /* ContinueStatement */:
                         return emitContinueStatement(node);
-                    case 224:
+                    case 224 /* BreakStatement */:
                         return emitBreakStatement(node);
-                    case 225:
+                    case 225 /* ReturnStatement */:
                         return emitReturnStatement(node);
-                    case 226:
+                    case 226 /* WithStatement */:
                         return emitWithStatement(node);
-                    case 227:
+                    case 227 /* SwitchStatement */:
                         return emitSwitchStatement(node);
-                    case 228:
+                    case 228 /* LabeledStatement */:
                         return emitLabeledStatement(node);
-                    case 229:
+                    case 229 /* ThrowStatement */:
                         return emitThrowStatement(node);
-                    case 230:
+                    case 230 /* TryStatement */:
                         return emitTryStatement(node);
-                    case 231:
+                    case 231 /* DebuggerStatement */:
                         return emitDebuggerStatement(node);
-                    case 232:
+                    // Declarations
+                    case 232 /* VariableDeclaration */:
                         return emitVariableDeclaration(node);
-                    case 233:
+                    case 233 /* VariableDeclarationList */:
                         return emitVariableDeclarationList(node);
-                    case 234:
+                    case 234 /* FunctionDeclaration */:
                         return emitFunctionDeclaration(node);
-                    case 235:
+                    case 235 /* ClassDeclaration */:
                         return emitClassDeclaration(node);
-                    case 236:
+                    case 236 /* InterfaceDeclaration */:
                         return emitInterfaceDeclaration(node);
-                    case 237:
+                    case 237 /* TypeAliasDeclaration */:
                         return emitTypeAliasDeclaration(node);
-                    case 238:
+                    case 238 /* EnumDeclaration */:
                         return emitEnumDeclaration(node);
-                    case 239:
+                    case 239 /* ModuleDeclaration */:
                         return emitModuleDeclaration(node);
-                    case 240:
+                    case 240 /* ModuleBlock */:
                         return emitModuleBlock(node);
-                    case 241:
+                    case 241 /* CaseBlock */:
                         return emitCaseBlock(node);
-                    case 242:
+                    case 242 /* NamespaceExportDeclaration */:
                         return emitNamespaceExportDeclaration(node);
-                    case 243:
+                    case 243 /* ImportEqualsDeclaration */:
                         return emitImportEqualsDeclaration(node);
-                    case 244:
+                    case 244 /* ImportDeclaration */:
                         return emitImportDeclaration(node);
-                    case 245:
+                    case 245 /* ImportClause */:
                         return emitImportClause(node);
-                    case 246:
+                    case 246 /* NamespaceImport */:
                         return emitNamespaceImport(node);
-                    case 247:
+                    case 247 /* NamedImports */:
                         return emitNamedImports(node);
-                    case 248:
+                    case 248 /* ImportSpecifier */:
                         return emitImportSpecifier(node);
-                    case 249:
+                    case 249 /* ExportAssignment */:
                         return emitExportAssignment(node);
-                    case 250:
+                    case 250 /* ExportDeclaration */:
                         return emitExportDeclaration(node);
-                    case 251:
+                    case 251 /* NamedExports */:
                         return emitNamedExports(node);
-                    case 252:
+                    case 252 /* ExportSpecifier */:
                         return emitExportSpecifier(node);
-                    case 253:
+                    case 253 /* MissingDeclaration */:
                         return;
-                    case 254:
+                    // Module references
+                    case 254 /* ExternalModuleReference */:
                         return emitExternalModuleReference(node);
-                    case 10:
+                    // JSX (non-expression)
+                    case 10 /* JsxText */:
                         return emitJsxText(node);
-                    case 257:
-                    case 260:
+                    case 257 /* JsxOpeningElement */:
+                    case 260 /* JsxOpeningFragment */:
                         return emitJsxOpeningElementOrFragment(node);
-                    case 258:
-                    case 261:
+                    case 258 /* JsxClosingElement */:
+                    case 261 /* JsxClosingFragment */:
                         return emitJsxClosingElementOrFragment(node);
-                    case 262:
+                    case 262 /* JsxAttribute */:
                         return emitJsxAttribute(node);
-                    case 263:
+                    case 263 /* JsxAttributes */:
                         return emitJsxAttributes(node);
-                    case 264:
+                    case 264 /* JsxSpreadAttribute */:
                         return emitJsxSpreadAttribute(node);
-                    case 265:
+                    case 265 /* JsxExpression */:
                         return emitJsxExpression(node);
-                    case 266:
+                    // Clauses
+                    case 266 /* CaseClause */:
                         return emitCaseClause(node);
-                    case 267:
+                    case 267 /* DefaultClause */:
                         return emitDefaultClause(node);
-                    case 268:
+                    case 268 /* HeritageClause */:
                         return emitHeritageClause(node);
-                    case 269:
+                    case 269 /* CatchClause */:
                         return emitCatchClause(node);
-                    case 270:
+                    // Property assignments
+                    case 270 /* PropertyAssignment */:
                         return emitPropertyAssignment(node);
-                    case 271:
+                    case 271 /* ShorthandPropertyAssignment */:
                         return emitShorthandPropertyAssignment(node);
-                    case 272:
+                    case 272 /* SpreadAssignment */:
                         return emitSpreadAssignment(node);
-                    case 273:
+                    // Enum
+                    case 273 /* EnumMember */:
                         return emitEnumMember(node);
+                    // JSDoc nodes (ignored)
+                    // Transformation nodes (ignored)
                 }
                 if (ts.isExpression(node)) {
-                    hint = 1;
-                    node = trySubstituteNode(1, node);
+                    hint = 1 /* Expression */;
+                    node = trySubstituteNode(1 /* Expression */, node);
                 }
                 else if (ts.isToken(node)) {
                     return writeTokenNode(node, writePunctuation);
                 }
             }
-            if (hint === 1) {
+            if (hint === 1 /* Expression */) {
                 switch (node.kind) {
-                    case 8:
+                    // Literals
+                    case 8 /* NumericLiteral */:
                         return emitNumericLiteral(node);
-                    case 9:
-                    case 12:
-                    case 13:
+                    case 9 /* StringLiteral */:
+                    case 12 /* RegularExpressionLiteral */:
+                    case 13 /* NoSubstitutionTemplateLiteral */:
                         return emitLiteral(node);
-                    case 71:
+                    // Identifiers
+                    case 71 /* Identifier */:
                         return emitIdentifier(node);
-                    case 86:
-                    case 95:
-                    case 97:
-                    case 101:
-                    case 99:
-                    case 91:
+                    // Reserved words
+                    case 86 /* FalseKeyword */:
+                    case 95 /* NullKeyword */:
+                    case 97 /* SuperKeyword */:
+                    case 101 /* TrueKeyword */:
+                    case 99 /* ThisKeyword */:
+                    case 91 /* ImportKeyword */:
                         writeTokenNode(node, writeKeyword);
                         return;
-                    case 183:
+                    // Expressions
+                    case 183 /* ArrayLiteralExpression */:
                         return emitArrayLiteralExpression(node);
-                    case 184:
+                    case 184 /* ObjectLiteralExpression */:
                         return emitObjectLiteralExpression(node);
-                    case 185:
+                    case 185 /* PropertyAccessExpression */:
                         return emitPropertyAccessExpression(node);
-                    case 186:
+                    case 186 /* ElementAccessExpression */:
                         return emitElementAccessExpression(node);
-                    case 187:
+                    case 187 /* CallExpression */:
                         return emitCallExpression(node);
-                    case 188:
+                    case 188 /* NewExpression */:
                         return emitNewExpression(node);
-                    case 189:
+                    case 189 /* TaggedTemplateExpression */:
                         return emitTaggedTemplateExpression(node);
-                    case 190:
+                    case 190 /* TypeAssertionExpression */:
                         return emitTypeAssertionExpression(node);
-                    case 191:
+                    case 191 /* ParenthesizedExpression */:
                         return emitParenthesizedExpression(node);
-                    case 192:
+                    case 192 /* FunctionExpression */:
                         return emitFunctionExpression(node);
-                    case 193:
+                    case 193 /* ArrowFunction */:
                         return emitArrowFunction(node);
-                    case 194:
+                    case 194 /* DeleteExpression */:
                         return emitDeleteExpression(node);
-                    case 195:
+                    case 195 /* TypeOfExpression */:
                         return emitTypeOfExpression(node);
-                    case 196:
+                    case 196 /* VoidExpression */:
                         return emitVoidExpression(node);
-                    case 197:
+                    case 197 /* AwaitExpression */:
                         return emitAwaitExpression(node);
-                    case 198:
+                    case 198 /* PrefixUnaryExpression */:
                         return emitPrefixUnaryExpression(node);
-                    case 199:
+                    case 199 /* PostfixUnaryExpression */:
                         return emitPostfixUnaryExpression(node);
-                    case 200:
+                    case 200 /* BinaryExpression */:
                         return emitBinaryExpression(node);
-                    case 201:
+                    case 201 /* ConditionalExpression */:
                         return emitConditionalExpression(node);
-                    case 202:
+                    case 202 /* TemplateExpression */:
                         return emitTemplateExpression(node);
-                    case 203:
+                    case 203 /* YieldExpression */:
                         return emitYieldExpression(node);
-                    case 204:
+                    case 204 /* SpreadElement */:
                         return emitSpreadExpression(node);
-                    case 205:
+                    case 205 /* ClassExpression */:
                         return emitClassExpression(node);
-                    case 206:
+                    case 206 /* OmittedExpression */:
                         return;
-                    case 208:
+                    case 208 /* AsExpression */:
                         return emitAsExpression(node);
-                    case 209:
+                    case 209 /* NonNullExpression */:
                         return emitNonNullExpression(node);
-                    case 210:
+                    case 210 /* MetaProperty */:
                         return emitMetaProperty(node);
-                    case 255:
+                    // JSX
+                    case 255 /* JsxElement */:
                         return emitJsxElement(node);
-                    case 256:
+                    case 256 /* JsxSelfClosingElement */:
                         return emitJsxSelfClosingElement(node);
-                    case 259:
+                    case 259 /* JsxFragment */:
                         return emitJsxFragment(node);
-                    case 301:
+                    // Transformation nodes
+                    case 301 /* PartiallyEmittedExpression */:
                         return emitPartiallyEmittedExpression(node);
-                    case 302:
+                    case 302 /* CommaListExpression */:
                         return emitCommaList(node);
                 }
             }
@@ -62229,7 +77865,7 @@ var ts;
         }
         function emitHelpers(node) {
             var helpersEmitted = false;
-            var bundle = node.kind === 275 ? node : undefined;
+            var bundle = node.kind === 275 /* Bundle */ ? node : undefined;
             if (bundle && moduleKind === ts.ModuleKind.None) {
                 return;
             }
@@ -62244,8 +77880,13 @@ var ts;
                     for (var _a = 0, _b = ts.stableSort(helpers, ts.compareEmitHelpers); _a < _b.length; _a++) {
                         var helper = _b[_a];
                         if (!helper.scoped) {
+                            // Skip the helper if it can be skipped and the noEmitHelpers compiler
+                            // option is set, or if it can be imported and the importHelpers compiler
+                            // option is set.
                             if (shouldSkip)
                                 continue;
+                            // Skip the helper if it can be bundled but hasn't already been emitted and we
+                            // are emitting a bundled module.
                             if (shouldBundle) {
                                 if (bundledHelpers.get(helper.name)) {
                                     continue;
@@ -62254,6 +77895,7 @@ var ts;
                             }
                         }
                         else if (bundle) {
+                            // Skip the helper if it is scoped and we are emitting bundled helpers
                             continue;
                         }
                         if (typeof helper.text === "string") {
@@ -62268,34 +77910,52 @@ var ts;
             }
             return helpersEmitted;
         }
+        //
+        // Literals/Pseudo-literals
+        //
+        // SyntaxKind.NumericLiteral
         function emitNumericLiteral(node) {
             emitLiteral(node);
         }
+        // SyntaxKind.StringLiteral
+        // SyntaxKind.RegularExpressionLiteral
+        // SyntaxKind.NoSubstitutionTemplateLiteral
+        // SyntaxKind.TemplateHead
+        // SyntaxKind.TemplateMiddle
+        // SyntaxKind.TemplateTail
         function emitLiteral(node) {
             var text = getLiteralTextOfNode(node);
             if ((printerOptions.sourceMap || printerOptions.inlineSourceMap)
-                && (node.kind === 9 || ts.isTemplateLiteralKind(node.kind))) {
+                && (node.kind === 9 /* StringLiteral */ || ts.isTemplateLiteralKind(node.kind))) {
                 writeLiteral(text);
             }
             else {
+                // Quick info expects all literals to be called with writeStringLiteral, as there's no specific type for numberLiterals
                 writeStringLiteral(text);
             }
         }
+        // SyntaxKind.UnparsedSource
         function emitUnparsedSource(unparsed) {
-            write(unparsed.text);
+            writer.rawWrite(unparsed.text);
         }
+        //
+        // Identifiers
+        //
         function emitIdentifier(node) {
             var writeText = node.symbol ? writeSymbol : write;
-            writeText(getTextOfNode(node, false), node.symbol);
-            emitList(node, node.typeArguments, 26896);
+            writeText(getTextOfNode(node, /*includeTrivia*/ false), node.symbol);
+            emitList(node, node.typeArguments, 26896 /* TypeParameters */); // Call emitList directly since it could be an array of TypeParameterDeclarations _or_ type arguments
         }
+        //
+        // Names
+        //
         function emitQualifiedName(node) {
             emitEntityName(node.left);
             writePunctuation(".");
             emit(node.right);
         }
         function emitEntityName(node) {
-            if (node.kind === 71) {
+            if (node.kind === 71 /* Identifier */) {
                 emitExpression(node);
             }
             else {
@@ -62307,6 +77967,9 @@ var ts;
             emitExpression(node.expression);
             writePunctuation("]");
         }
+        //
+        // Signature elements
+        //
         function emitTypeParameter(node) {
             emit(node.name);
             if (node.constraint) {
@@ -62328,18 +77991,22 @@ var ts;
             emit(node.dotDotDotToken);
             emitNodeWithWriter(node.name, writeParameter);
             emit(node.questionToken);
-            if (node.parent && node.parent.kind === 284 && !node.name) {
+            if (node.parent && node.parent.kind === 284 /* JSDocFunctionType */ && !node.name) {
                 emit(node.type);
             }
             else {
                 emitTypeAnnotation(node.type);
             }
+            // The comment position has to fallback to any present node within the parameterdeclaration because as it turns out, the parser can make parameter declarations with _just_ an initializer.
             emitInitializer(node.initializer, node.type ? node.type.end : node.questionToken ? node.questionToken.end : node.name ? node.name.end : node.modifiers ? node.modifiers.end : node.decorators ? node.decorators.end : node.pos, node);
         }
         function emitDecorator(decorator) {
             writePunctuation("@");
             emitExpression(decorator.expression);
         }
+        //
+        // Type members
+        //
         function emitPropertySignature(node) {
             emitDecorators(node, node.decorators);
             emitModifiers(node, node.modifiers);
@@ -62386,7 +78053,7 @@ var ts;
         function emitAccessorDeclaration(node) {
             emitDecorators(node, node.decorators);
             emitModifiers(node, node.modifiers);
-            writeKeyword(node.kind === 156 ? "get" : "set");
+            writeKeyword(node.kind === 156 /* GetAccessor */ ? "get" : "set");
             writeSpace();
             emit(node.name);
             emitSignatureAndBody(node, emitSignatureHead);
@@ -62423,6 +78090,9 @@ var ts;
         function emitSemicolonClassElement() {
             writeSemicolon();
         }
+        //
+        // Types
+        //
         function emitTypePredicate(node) {
             emit(node.parameterName);
             writeSpace();
@@ -62481,8 +78151,8 @@ var ts;
         }
         function emitTypeLiteral(node) {
             writePunctuation("{");
-            var flags = ts.getEmitFlags(node) & 1 ? 384 : 16449;
-            emitList(node, node.members, flags | 262144);
+            var flags = ts.getEmitFlags(node) & 1 /* SingleLine */ ? 384 /* SingleLineTypeLiteralMembers */ : 16449 /* MultiLineTypeLiteralMembers */;
+            emitList(node, node.members, flags | 262144 /* NoSpaceIfEmpty */);
             writePunctuation("}");
         }
         function emitArrayType(node) {
@@ -62496,14 +78166,14 @@ var ts;
         }
         function emitTupleType(node) {
             writePunctuation("[");
-            emitList(node, node.elementTypes, 272);
+            emitList(node, node.elementTypes, 272 /* TupleTypeElements */);
             writePunctuation("]");
         }
         function emitUnionType(node) {
-            emitList(node, node.types, 260);
+            emitList(node, node.types, 260 /* UnionTypeConstituents */);
         }
         function emitIntersectionType(node) {
-            emitList(node, node.types, 264);
+            emitList(node, node.types, 264 /* IntersectionTypeConstituents */);
         }
         function emitConditionalType(node) {
             emit(node.checkType);
@@ -62547,7 +78217,7 @@ var ts;
         function emitMappedType(node) {
             var emitFlags = ts.getEmitFlags(node);
             writePunctuation("{");
-            if (emitFlags & 1) {
+            if (emitFlags & 1 /* SingleLine */) {
                 writeSpace();
             }
             else {
@@ -62556,18 +78226,18 @@ var ts;
             }
             if (node.readonlyToken) {
                 emit(node.readonlyToken);
-                if (node.readonlyToken.kind !== 132) {
+                if (node.readonlyToken.kind !== 132 /* ReadonlyKeyword */) {
                     writeKeyword("readonly");
                 }
                 writeSpace();
             }
             writePunctuation("[");
-            var pipelinePhase = getPipelinePhase(0, 3);
-            pipelinePhase(3, node.typeParameter);
+            var pipelinePhase = getPipelinePhase(0 /* Notification */, 3 /* MappedTypeParameter */);
+            pipelinePhase(3 /* MappedTypeParameter */, node.typeParameter);
             writePunctuation("]");
             if (node.questionToken) {
                 emit(node.questionToken);
-                if (node.questionToken.kind !== 55) {
+                if (node.questionToken.kind !== 55 /* QuestionToken */) {
                     writePunctuation("?");
                 }
             }
@@ -62575,7 +78245,7 @@ var ts;
             writeSpace();
             emit(node.type);
             writeSemicolon();
-            if (emitFlags & 1) {
+            if (emitFlags & 1 /* SingleLine */) {
                 writeSpace();
             }
             else {
@@ -62602,14 +78272,17 @@ var ts;
             }
             emitTypeArguments(node, node.typeArguments);
         }
+        //
+        // Binding patterns
+        //
         function emitObjectBindingPattern(node) {
             writePunctuation("{");
-            emitList(node, node.elements, 262576);
+            emitList(node, node.elements, 262576 /* ObjectBindingPatternElements */);
             writePunctuation("}");
         }
         function emitArrayBindingPattern(node) {
             writePunctuation("[");
-            emitList(node, node.elements, 262448);
+            emitList(node, node.elements, 262448 /* ArrayBindingPatternElements */);
             writePunctuation("]");
         }
         function emitBindingElement(node) {
@@ -62622,20 +78295,23 @@ var ts;
             emit(node.name);
             emitInitializer(node.initializer, node.name.end, node);
         }
+        //
+        // Expressions
+        //
         function emitArrayLiteralExpression(node) {
             var elements = node.elements;
-            var preferNewLine = node.multiLine ? 32768 : 0;
-            emitExpressionList(node, elements, 4466 | preferNewLine);
+            var preferNewLine = node.multiLine ? 32768 /* PreferNewLine */ : 0 /* None */;
+            emitExpressionList(node, elements, 4466 /* ArrayLiteralExpressionElements */ | preferNewLine);
         }
         function emitObjectLiteralExpression(node) {
             ts.forEach(node.properties, generateMemberNames);
-            var indentedFlag = ts.getEmitFlags(node) & 65536;
+            var indentedFlag = ts.getEmitFlags(node) & 65536 /* Indented */;
             if (indentedFlag) {
                 increaseIndent();
             }
-            var preferNewLine = node.multiLine ? 32768 : 0;
-            var allowTrailingComma = currentSourceFile.languageVersion >= 1 && !ts.isJsonSourceFile(currentSourceFile) ? 32 : 0;
-            emitList(node, node.properties, 263122 | allowTrailingComma | preferNewLine);
+            var preferNewLine = node.multiLine ? 32768 /* PreferNewLine */ : 0 /* None */;
+            var allowTrailingComma = currentSourceFile.languageVersion >= 1 /* ES5 */ && !ts.isJsonSourceFile(currentSourceFile) ? 32 /* AllowTrailingComma */ : 0 /* None */;
+            emitList(node, node.properties, 263122 /* ObjectLiteralExpressionProperties */ | allowTrailingComma | preferNewLine);
             if (indentedFlag) {
                 decreaseIndent();
             }
@@ -62643,10 +78319,10 @@ var ts;
         function emitPropertyAccessExpression(node) {
             var indentBeforeDot = false;
             var indentAfterDot = false;
-            if (!(ts.getEmitFlags(node) & 131072)) {
+            if (!(ts.getEmitFlags(node) & 131072 /* NoIndentation */)) {
                 var dotRangeStart = node.expression.end;
                 var dotRangeEnd = ts.skipTrivia(currentSourceFile.text, node.expression.end) + 1;
-                var dotToken = ts.createToken(23);
+                var dotToken = ts.createToken(23 /* DotToken */);
                 dotToken.pos = dotRangeStart;
                 dotToken.end = dotRangeEnd;
                 indentBeforeDot = needsIndentation(node, node.expression, dotToken);
@@ -62658,20 +78334,25 @@ var ts;
             if (shouldEmitDotDot) {
                 writePunctuation(".");
             }
-            emitTokenWithComment(23, node.expression.end, writePunctuation, node);
+            emitTokenWithComment(23 /* DotToken */, node.expression.end, writePunctuation, node);
             increaseIndentIf(indentAfterDot);
             emit(node.name);
             decreaseIndentIf(indentBeforeDot, indentAfterDot);
         }
+        // 1..toString is a valid property access, emit a dot after the literal
+        // Also emit a dot if expression is a integer const enum value - it will appear in generated code as numeric literal
         function needsDotDotForPropertyAccess(expression) {
             expression = ts.skipPartiallyEmittedExpressions(expression);
             if (ts.isNumericLiteral(expression)) {
+                // check if numeric literal is a decimal literal that was originally written with a dot
                 var text = getLiteralTextOfNode(expression);
                 return !expression.numericLiteralFlags
-                    && !ts.stringContains(text, ts.tokenToString(23));
+                    && !ts.stringContains(text, ts.tokenToString(23 /* DotToken */));
             }
             else if (ts.isPropertyAccessExpression(expression) || ts.isElementAccessExpression(expression)) {
+                // check if constant enum value is integer
                 var constantValue = ts.getConstantValue(expression);
+                // isFinite handles cases when constantValue is undefined
                 return typeof constantValue === "number" && isFinite(constantValue)
                     && Math.floor(constantValue) === constantValue
                     && printerOptions.removeComments;
@@ -62679,21 +78360,21 @@ var ts;
         }
         function emitElementAccessExpression(node) {
             emitExpression(node.expression);
-            emitTokenWithComment(21, node.expression.end, writePunctuation, node);
+            emitTokenWithComment(21 /* OpenBracketToken */, node.expression.end, writePunctuation, node);
             emitExpression(node.argumentExpression);
-            emitTokenWithComment(22, node.argumentExpression.end, writePunctuation, node);
+            emitTokenWithComment(22 /* CloseBracketToken */, node.argumentExpression.end, writePunctuation, node);
         }
         function emitCallExpression(node) {
             emitExpression(node.expression);
             emitTypeArguments(node, node.typeArguments);
-            emitExpressionList(node, node.arguments, 1296);
+            emitExpressionList(node, node.arguments, 1296 /* CallExpressionArguments */);
         }
         function emitNewExpression(node) {
-            emitTokenWithComment(94, node.pos, writeKeyword, node);
+            emitTokenWithComment(94 /* NewKeyword */, node.pos, writeKeyword, node);
             writeSpace();
             emitExpression(node.expression);
             emitTypeArguments(node, node.typeArguments);
-            emitExpressionList(node, node.arguments, 9488);
+            emitExpressionList(node, node.arguments, 9488 /* NewExpressionArguments */);
         }
         function emitTaggedTemplateExpression(node) {
             emitExpression(node.tag);
@@ -62708,9 +78389,9 @@ var ts;
             emitExpression(node.expression);
         }
         function emitParenthesizedExpression(node) {
-            var openParenPos = emitTokenWithComment(19, node.pos, writePunctuation, node);
+            var openParenPos = emitTokenWithComment(19 /* OpenParenToken */, node.pos, writePunctuation, node);
             emitExpression(node.expression);
-            emitTokenWithComment(20, node.expression ? node.expression.end : openParenPos, writePunctuation, node);
+            emitTokenWithComment(20 /* CloseParenToken */, node.expression ? node.expression.end : openParenPos, writePunctuation, node);
         }
         function emitFunctionExpression(node) {
             generateNameIfNeeded(node.name);
@@ -62729,22 +78410,22 @@ var ts;
             emit(node.equalsGreaterThanToken);
         }
         function emitDeleteExpression(node) {
-            emitTokenWithComment(80, node.pos, writeKeyword, node);
+            emitTokenWithComment(80 /* DeleteKeyword */, node.pos, writeKeyword, node);
             writeSpace();
             emitExpression(node.expression);
         }
         function emitTypeOfExpression(node) {
-            emitTokenWithComment(103, node.pos, writeKeyword, node);
+            emitTokenWithComment(103 /* TypeOfKeyword */, node.pos, writeKeyword, node);
             writeSpace();
             emitExpression(node.expression);
         }
         function emitVoidExpression(node) {
-            emitTokenWithComment(105, node.pos, writeKeyword, node);
+            emitTokenWithComment(105 /* VoidKeyword */, node.pos, writeKeyword, node);
             writeSpace();
             emitExpression(node.expression);
         }
         function emitAwaitExpression(node) {
-            emitTokenWithComment(121, node.pos, writeKeyword, node);
+            emitTokenWithComment(121 /* AwaitKeyword */, node.pos, writeKeyword, node);
             writeSpace();
             emitExpression(node.expression);
         }
@@ -62756,24 +78437,36 @@ var ts;
             emitExpression(node.operand);
         }
         function shouldEmitWhitespaceBeforeOperand(node) {
+            // In some cases, we need to emit a space between the operator and the operand. One obvious case
+            // is when the operator is an identifier, like delete or typeof. We also need to do this for plus
+            // and minus expressions in certain cases. Specifically, consider the following two cases (parens
+            // are just for clarity of exposition, and not part of the source code):
+            //
+            //  (+(+1))
+            //  (+(++1))
+            //
+            // We need to emit a space in both cases. In the first case, the absence of a space will make
+            // the resulting expression a prefix increment operation. And in the second, it will make the resulting
+            // expression a prefix increment whose operand is a plus expression - (++(+x))
+            // The same is true of minus of course.
             var operand = node.operand;
-            return operand.kind === 198
-                && ((node.operator === 37 && (operand.operator === 37 || operand.operator === 43))
-                    || (node.operator === 38 && (operand.operator === 38 || operand.operator === 44)));
+            return operand.kind === 198 /* PrefixUnaryExpression */
+                && ((node.operator === 37 /* PlusToken */ && (operand.operator === 37 /* PlusToken */ || operand.operator === 43 /* PlusPlusToken */))
+                    || (node.operator === 38 /* MinusToken */ && (operand.operator === 38 /* MinusToken */ || operand.operator === 44 /* MinusMinusToken */)));
         }
         function emitPostfixUnaryExpression(node) {
             emitExpression(node.operand);
             writeTokenText(node.operator, writeOperator);
         }
         function emitBinaryExpression(node) {
-            var isCommaOperator = node.operatorToken.kind !== 26;
+            var isCommaOperator = node.operatorToken.kind !== 26 /* CommaToken */;
             var indentBeforeOperator = needsIndentation(node, node.left, node.operatorToken);
             var indentAfterOperator = needsIndentation(node, node.operatorToken, node.right);
             emitExpression(node.left);
             increaseIndentIf(indentBeforeOperator, isCommaOperator ? " " : undefined);
             emitLeadingCommentsOfPosition(node.operatorToken.pos);
             writeTokenNode(node.operatorToken, writeOperator);
-            emitTrailingCommentsOfPosition(node.operatorToken.end, true);
+            emitTrailingCommentsOfPosition(node.operatorToken.end, /*prefixSpace*/ true); // Binary operators should have a space before the comment starts
             increaseIndentIf(indentAfterOperator, " ");
             emitExpression(node.right);
             decreaseIndentIf(indentBeforeOperator, indentAfterOperator);
@@ -62797,10 +78490,10 @@ var ts;
         }
         function emitTemplateExpression(node) {
             emit(node.head);
-            emitList(node, node.templateSpans, 131072);
+            emitList(node, node.templateSpans, 131072 /* TemplateExpressionSpans */);
         }
         function emitYieldExpression(node) {
-            emitTokenWithComment(116, node.pos, writeKeyword, node);
+            emitTokenWithComment(116 /* YieldKeyword */, node.pos, writeKeyword, node);
             emit(node.asteriskToken);
             emitExpressionWithLeadingSpace(node.expression);
         }
@@ -62834,18 +78527,24 @@ var ts;
             writePunctuation(".");
             emit(node.name);
         }
+        //
+        // Misc
+        //
         function emitTemplateSpan(node) {
             emitExpression(node.expression);
             emit(node.literal);
         }
+        //
+        // Statements
+        //
         function emitBlock(node) {
-            emitBlockStatements(node, !node.multiLine && isEmptyBlock(node));
+            emitBlockStatements(node, /*forceSingleLine*/ !node.multiLine && isEmptyBlock(node));
         }
         function emitBlockStatements(node, forceSingleLine) {
-            emitTokenWithComment(17, node.pos, writePunctuation, node);
-            var format = forceSingleLine || ts.getEmitFlags(node) & 1 ? 384 : 65;
+            emitTokenWithComment(17 /* OpenBraceToken */, node.pos, writePunctuation, /*contextNode*/ node);
+            var format = forceSingleLine || ts.getEmitFlags(node) & 1 /* SingleLine */ ? 384 /* SingleLineBlockStatements */ : 65 /* MultiLineBlockStatements */;
             emitList(node, node.statements, format);
-            emitTokenWithComment(18, node.statements.end, writePunctuation, node, !!(format & 1));
+            emitTokenWithComment(18 /* CloseBraceToken */, node.statements.end, writePunctuation, /*contextNode*/ node, /*indentLeading*/ !!(format & 1 /* MultiLine */));
         }
         function emitVariableStatement(node) {
             emitModifiers(node, node.modifiers);
@@ -62862,16 +78561,16 @@ var ts;
             }
         }
         function emitIfStatement(node) {
-            var openParenPos = emitTokenWithComment(90, node.pos, writeKeyword, node);
+            var openParenPos = emitTokenWithComment(90 /* IfKeyword */, node.pos, writeKeyword, node);
             writeSpace();
-            emitTokenWithComment(19, openParenPos, writePunctuation, node);
+            emitTokenWithComment(19 /* OpenParenToken */, openParenPos, writePunctuation, node);
             emitExpression(node.expression);
-            emitTokenWithComment(20, node.expression.end, writePunctuation, node);
+            emitTokenWithComment(20 /* CloseParenToken */, node.expression.end, writePunctuation, node);
             emitEmbeddedStatement(node, node.thenStatement);
             if (node.elseStatement) {
                 writeLineOrSpace(node);
-                emitTokenWithComment(82, node.thenStatement.end, writeKeyword, node);
-                if (node.elseStatement.kind === 217) {
+                emitTokenWithComment(82 /* ElseKeyword */, node.thenStatement.end, writeKeyword, node);
+                if (node.elseStatement.kind === 217 /* IfStatement */) {
                     writeSpace();
                     emit(node.elseStatement);
                 }
@@ -62881,14 +78580,14 @@ var ts;
             }
         }
         function emitWhileClause(node, startPos) {
-            var openParenPos = emitTokenWithComment(106, startPos, writeKeyword, node);
+            var openParenPos = emitTokenWithComment(106 /* WhileKeyword */, startPos, writeKeyword, node);
             writeSpace();
-            emitTokenWithComment(19, openParenPos, writePunctuation, node);
+            emitTokenWithComment(19 /* OpenParenToken */, openParenPos, writePunctuation, node);
             emitExpression(node.expression);
-            emitTokenWithComment(20, node.expression.end, writePunctuation, node);
+            emitTokenWithComment(20 /* CloseParenToken */, node.expression.end, writePunctuation, node);
         }
         function emitDoStatement(node) {
-            emitTokenWithComment(81, node.pos, writeKeyword, node);
+            emitTokenWithComment(81 /* DoKeyword */, node.pos, writeKeyword, node);
             emitEmbeddedStatement(node, node.statement);
             if (ts.isBlock(node.statement)) {
                 writeSpace();
@@ -62904,45 +78603,45 @@ var ts;
             emitEmbeddedStatement(node, node.statement);
         }
         function emitForStatement(node) {
-            var openParenPos = emitTokenWithComment(88, node.pos, writeKeyword, node);
+            var openParenPos = emitTokenWithComment(88 /* ForKeyword */, node.pos, writeKeyword, node);
             writeSpace();
-            var pos = emitTokenWithComment(19, openParenPos, writePunctuation, node);
+            var pos = emitTokenWithComment(19 /* OpenParenToken */, openParenPos, writePunctuation, /*contextNode*/ node);
             emitForBinding(node.initializer);
-            pos = emitTokenWithComment(25, node.initializer ? node.initializer.end : pos, writeSemicolon, node);
+            pos = emitTokenWithComment(25 /* SemicolonToken */, node.initializer ? node.initializer.end : pos, writeSemicolon, node);
             emitExpressionWithLeadingSpace(node.condition);
-            pos = emitTokenWithComment(25, node.condition ? node.condition.end : pos, writeSemicolon, node);
+            pos = emitTokenWithComment(25 /* SemicolonToken */, node.condition ? node.condition.end : pos, writeSemicolon, node);
             emitExpressionWithLeadingSpace(node.incrementor);
-            emitTokenWithComment(20, node.incrementor ? node.incrementor.end : pos, writePunctuation, node);
+            emitTokenWithComment(20 /* CloseParenToken */, node.incrementor ? node.incrementor.end : pos, writePunctuation, node);
             emitEmbeddedStatement(node, node.statement);
         }
         function emitForInStatement(node) {
-            var openParenPos = emitTokenWithComment(88, node.pos, writeKeyword, node);
+            var openParenPos = emitTokenWithComment(88 /* ForKeyword */, node.pos, writeKeyword, node);
             writeSpace();
-            emitTokenWithComment(19, openParenPos, writePunctuation, node);
+            emitTokenWithComment(19 /* OpenParenToken */, openParenPos, writePunctuation, node);
             emitForBinding(node.initializer);
             writeSpace();
-            emitTokenWithComment(92, node.initializer.end, writeKeyword, node);
+            emitTokenWithComment(92 /* InKeyword */, node.initializer.end, writeKeyword, node);
             writeSpace();
             emitExpression(node.expression);
-            emitTokenWithComment(20, node.expression.end, writePunctuation, node);
+            emitTokenWithComment(20 /* CloseParenToken */, node.expression.end, writePunctuation, node);
             emitEmbeddedStatement(node, node.statement);
         }
         function emitForOfStatement(node) {
-            var openParenPos = emitTokenWithComment(88, node.pos, writeKeyword, node);
+            var openParenPos = emitTokenWithComment(88 /* ForKeyword */, node.pos, writeKeyword, node);
             writeSpace();
             emitWithTrailingSpace(node.awaitModifier);
-            emitTokenWithComment(19, openParenPos, writePunctuation, node);
+            emitTokenWithComment(19 /* OpenParenToken */, openParenPos, writePunctuation, node);
             emitForBinding(node.initializer);
             writeSpace();
-            emitTokenWithComment(145, node.initializer.end, writeKeyword, node);
+            emitTokenWithComment(145 /* OfKeyword */, node.initializer.end, writeKeyword, node);
             writeSpace();
             emitExpression(node.expression);
-            emitTokenWithComment(20, node.expression.end, writePunctuation, node);
+            emitTokenWithComment(20 /* CloseParenToken */, node.expression.end, writePunctuation, node);
             emitEmbeddedStatement(node, node.statement);
         }
         function emitForBinding(node) {
             if (node !== undefined) {
-                if (node.kind === 233) {
+                if (node.kind === 233 /* VariableDeclarationList */) {
                     emit(node);
                 }
                 else {
@@ -62951,12 +78650,12 @@ var ts;
             }
         }
         function emitContinueStatement(node) {
-            emitTokenWithComment(77, node.pos, writeKeyword, node);
+            emitTokenWithComment(77 /* ContinueKeyword */, node.pos, writeKeyword, node);
             emitWithLeadingSpace(node.label);
             writeSemicolon();
         }
         function emitBreakStatement(node) {
-            emitTokenWithComment(72, node.pos, writeKeyword, node);
+            emitTokenWithComment(72 /* BreakKeyword */, node.pos, writeKeyword, node);
             emitWithLeadingSpace(node.label);
             writeSemicolon();
         }
@@ -62979,45 +78678,45 @@ var ts;
             }
             pos = writeTokenText(token, writer, pos);
             if (emitTrailingCommentsOfPosition && isSimilarNode && contextNode.end !== pos) {
-                emitTrailingCommentsOfPosition(pos, true);
+                emitTrailingCommentsOfPosition(pos, /*prefixSpace*/ true);
             }
             return pos;
         }
         function emitReturnStatement(node) {
-            emitTokenWithComment(96, node.pos, writeKeyword, node);
+            emitTokenWithComment(96 /* ReturnKeyword */, node.pos, writeKeyword, /*contextNode*/ node);
             emitExpressionWithLeadingSpace(node.expression);
             writeSemicolon();
         }
         function emitWithStatement(node) {
-            var openParenPos = emitTokenWithComment(107, node.pos, writeKeyword, node);
+            var openParenPos = emitTokenWithComment(107 /* WithKeyword */, node.pos, writeKeyword, node);
             writeSpace();
-            emitTokenWithComment(19, openParenPos, writePunctuation, node);
+            emitTokenWithComment(19 /* OpenParenToken */, openParenPos, writePunctuation, node);
             emitExpression(node.expression);
-            emitTokenWithComment(20, node.expression.end, writePunctuation, node);
+            emitTokenWithComment(20 /* CloseParenToken */, node.expression.end, writePunctuation, node);
             emitEmbeddedStatement(node, node.statement);
         }
         function emitSwitchStatement(node) {
-            var openParenPos = emitTokenWithComment(98, node.pos, writeKeyword, node);
+            var openParenPos = emitTokenWithComment(98 /* SwitchKeyword */, node.pos, writeKeyword, node);
             writeSpace();
-            emitTokenWithComment(19, openParenPos, writePunctuation, node);
+            emitTokenWithComment(19 /* OpenParenToken */, openParenPos, writePunctuation, node);
             emitExpression(node.expression);
-            emitTokenWithComment(20, node.expression.end, writePunctuation, node);
+            emitTokenWithComment(20 /* CloseParenToken */, node.expression.end, writePunctuation, node);
             writeSpace();
             emit(node.caseBlock);
         }
         function emitLabeledStatement(node) {
             emit(node.label);
-            emitTokenWithComment(56, node.label.end, writePunctuation, node);
+            emitTokenWithComment(56 /* ColonToken */, node.label.end, writePunctuation, node);
             writeSpace();
             emit(node.statement);
         }
         function emitThrowStatement(node) {
-            emitTokenWithComment(100, node.pos, writeKeyword, node);
+            emitTokenWithComment(100 /* ThrowKeyword */, node.pos, writeKeyword, node);
             emitExpressionWithLeadingSpace(node.expression);
             writeSemicolon();
         }
         function emitTryStatement(node) {
-            emitTokenWithComment(102, node.pos, writeKeyword, node);
+            emitTokenWithComment(102 /* TryKeyword */, node.pos, writeKeyword, node);
             writeSpace();
             emit(node.tryBlock);
             if (node.catchClause) {
@@ -63026,15 +78725,18 @@ var ts;
             }
             if (node.finallyBlock) {
                 writeLineOrSpace(node);
-                emitTokenWithComment(87, (node.catchClause || node.tryBlock).end, writeKeyword, node);
+                emitTokenWithComment(87 /* FinallyKeyword */, (node.catchClause || node.tryBlock).end, writeKeyword, node);
                 writeSpace();
                 emit(node.finallyBlock);
             }
         }
         function emitDebuggerStatement(node) {
-            writeToken(78, node.pos, writeKeyword);
+            writeToken(78 /* DebuggerKeyword */, node.pos, writeKeyword);
             writeSemicolon();
         }
+        //
+        // Declarations
+        //
         function emitVariableDeclaration(node) {
             emit(node.name);
             emitTypeAnnotation(node.type);
@@ -63043,7 +78745,7 @@ var ts;
         function emitVariableDeclarationList(node) {
             writeKeyword(ts.isLet(node) ? "let" : ts.isConst(node) ? "const" : "var");
             writeSpace();
-            emitList(node, node.declarations, 272);
+            emitList(node, node.declarations, 272 /* VariableDeclarationList */);
         }
         function emitFunctionDeclaration(node) {
             emitFunctionDeclarationOrExpression(node);
@@ -63054,7 +78756,7 @@ var ts;
             writeKeyword("function");
             emit(node.asteriskToken);
             writeSpace();
-            emitIdentifierName(node.name);
+            emitIdentifierName(node.name); // TODO: GH#18217
             emitSignatureAndBody(node, emitSignatureHead);
         }
         function emitBlockCallback(_hint, body) {
@@ -63064,7 +78766,7 @@ var ts;
             var body = node.body;
             if (body) {
                 if (ts.isBlock(body)) {
-                    var indentedFlag = ts.getEmitFlags(node) & 65536;
+                    var indentedFlag = ts.getEmitFlags(node) & 65536 /* Indented */;
                     if (indentedFlag) {
                         increaseIndent();
                     }
@@ -63073,7 +78775,7 @@ var ts;
                     generateNames(node.body);
                     emitSignatureHead(node);
                     if (onEmitNode) {
-                        onEmitNode(4, body, emitBlockCallback);
+                        onEmitNode(4 /* Unspecified */, body, emitBlockCallback);
                     }
                     else {
                         emitBlockFunctionBody(body);
@@ -63100,7 +78802,13 @@ var ts;
             emitTypeAnnotation(node.type);
         }
         function shouldEmitBlockFunctionBodyOnSingleLine(body) {
-            if (ts.getEmitFlags(body) & 1) {
+            // We must emit a function body as a single-line body in the following case:
+            // * The body has NodeEmitFlags.SingleLine specified.
+            // We must emit a function body as a multi-line body in the following cases:
+            // * The body is explicitly marked as multi-line.
+            // * A non-synthesized body's start and end position are on different lines.
+            // * Any statement in the body starts on a new line.
+            if (ts.getEmitFlags(body) & 1 /* SingleLine */) {
                 return true;
             }
             if (body.multiLine) {
@@ -63109,14 +78817,14 @@ var ts;
             if (!ts.nodeIsSynthesized(body) && !ts.rangeIsOnSingleLine(body, currentSourceFile)) {
                 return false;
             }
-            if (shouldWriteLeadingLineTerminator(body, body.statements, 2)
-                || shouldWriteClosingLineTerminator(body, body.statements, 2)) {
+            if (shouldWriteLeadingLineTerminator(body, body.statements, 2 /* PreserveLines */)
+                || shouldWriteClosingLineTerminator(body, body.statements, 2 /* PreserveLines */)) {
                 return false;
             }
             var previousStatement;
             for (var _a = 0, _b = body.statements; _a < _b.length; _a++) {
                 var statement = _b[_a];
-                if (shouldWriteSeparatingLineTerminator(previousStatement, statement, 2)) {
+                if (shouldWriteSeparatingLineTerminator(previousStatement, statement, 2 /* PreserveLines */)) {
                     return false;
                 }
                 previousStatement = statement;
@@ -63137,22 +78845,23 @@ var ts;
                 emitBlockFunctionBody(body);
             }
             decreaseIndent();
-            writeToken(18, body.statements.end, writePunctuation, body);
+            writeToken(18 /* CloseBraceToken */, body.statements.end, writePunctuation, body);
         }
         function emitBlockFunctionBodyOnSingleLine(body) {
-            emitBlockFunctionBodyWorker(body, true);
+            emitBlockFunctionBodyWorker(body, /*emitBlockFunctionBodyOnSingleLine*/ true);
         }
         function emitBlockFunctionBodyWorker(body, emitBlockFunctionBodyOnSingleLine) {
-            var statementOffset = emitPrologueDirectives(body.statements, true);
+            // Emit all the prologue directives (like "use strict").
+            var statementOffset = emitPrologueDirectives(body.statements, /*startWithNewLine*/ true);
             var pos = writer.getTextPos();
             emitHelpers(body);
             if (statementOffset === 0 && pos === writer.getTextPos() && emitBlockFunctionBodyOnSingleLine) {
                 decreaseIndent();
-                emitList(body, body.statements, 384);
+                emitList(body, body.statements, 384 /* SingleLineFunctionBodyStatements */);
                 increaseIndent();
             }
             else {
-                emitList(body, body.statements, 1, statementOffset);
+                emitList(body, body.statements, 1 /* MultiLineFunctionBodyStatements */, statementOffset);
             }
         }
         function emitClassDeclaration(node) {
@@ -63167,15 +78876,15 @@ var ts;
                 writeSpace();
                 emitIdentifierName(node.name);
             }
-            var indentedFlag = ts.getEmitFlags(node) & 65536;
+            var indentedFlag = ts.getEmitFlags(node) & 65536 /* Indented */;
             if (indentedFlag) {
                 increaseIndent();
             }
             emitTypeParameters(node, node.typeParameters);
-            emitList(node, node.heritageClauses, 0);
+            emitList(node, node.heritageClauses, 0 /* ClassHeritageClauses */);
             writeSpace();
             writePunctuation("{");
-            emitList(node, node.members, 65);
+            emitList(node, node.members, 65 /* ClassMembers */);
             writePunctuation("}");
             if (indentedFlag) {
                 decreaseIndent();
@@ -63188,10 +78897,10 @@ var ts;
             writeSpace();
             emit(node.name);
             emitTypeParameters(node, node.typeParameters);
-            emitList(node, node.heritageClauses, 256);
+            emitList(node, node.heritageClauses, 256 /* HeritageClauses */);
             writeSpace();
             writePunctuation("{");
-            emitList(node, node.members, 65);
+            emitList(node, node.members, 65 /* InterfaceMembers */);
             writePunctuation("}");
         }
         function emitTypeAliasDeclaration(node) {
@@ -63214,20 +78923,20 @@ var ts;
             emit(node.name);
             writeSpace();
             writePunctuation("{");
-            emitList(node, node.members, 81);
+            emitList(node, node.members, 81 /* EnumMembers */);
             writePunctuation("}");
         }
         function emitModuleDeclaration(node) {
             emitModifiers(node, node.modifiers);
-            if (~node.flags & 512) {
-                writeKeyword(node.flags & 16 ? "namespace" : "module");
+            if (~node.flags & 512 /* GlobalAugmentation */) {
+                writeKeyword(node.flags & 16 /* Namespace */ ? "namespace" : "module");
                 writeSpace();
             }
             emit(node.name);
             var body = node.body;
             if (!body)
                 return writeSemicolon();
-            while (body.kind === 239) {
+            while (body.kind === 239 /* ModuleDeclaration */) {
                 writePunctuation(".");
                 emit(body.name);
                 body = body.body;
@@ -63238,27 +78947,27 @@ var ts;
         function emitModuleBlock(node) {
             pushNameGenerationScope(node);
             ts.forEach(node.statements, generateNames);
-            emitBlockStatements(node, isEmptyBlock(node));
+            emitBlockStatements(node, /*forceSingleLine*/ isEmptyBlock(node));
             popNameGenerationScope(node);
         }
         function emitCaseBlock(node) {
-            emitTokenWithComment(17, node.pos, writePunctuation, node);
-            emitList(node, node.clauses, 65);
-            emitTokenWithComment(18, node.clauses.end, writePunctuation, node, true);
+            emitTokenWithComment(17 /* OpenBraceToken */, node.pos, writePunctuation, node);
+            emitList(node, node.clauses, 65 /* CaseBlockClauses */);
+            emitTokenWithComment(18 /* CloseBraceToken */, node.clauses.end, writePunctuation, node, /*indentLeading*/ true);
         }
         function emitImportEqualsDeclaration(node) {
             emitModifiers(node, node.modifiers);
-            emitTokenWithComment(91, node.modifiers ? node.modifiers.end : node.pos, writeKeyword, node);
+            emitTokenWithComment(91 /* ImportKeyword */, node.modifiers ? node.modifiers.end : node.pos, writeKeyword, node);
             writeSpace();
             emit(node.name);
             writeSpace();
-            emitTokenWithComment(58, node.name.end, writePunctuation, node);
+            emitTokenWithComment(58 /* EqualsToken */, node.name.end, writePunctuation, node);
             writeSpace();
             emitModuleReference(node.moduleReference);
             writeSemicolon();
         }
         function emitModuleReference(node) {
-            if (node.kind === 71) {
+            if (node.kind === 71 /* Identifier */) {
                 emitExpression(node);
             }
             else {
@@ -63267,12 +78976,12 @@ var ts;
         }
         function emitImportDeclaration(node) {
             emitModifiers(node, node.modifiers);
-            emitTokenWithComment(91, node.modifiers ? node.modifiers.end : node.pos, writeKeyword, node);
+            emitTokenWithComment(91 /* ImportKeyword */, node.modifiers ? node.modifiers.end : node.pos, writeKeyword, node);
             writeSpace();
             if (node.importClause) {
                 emit(node.importClause);
                 writeSpace();
-                emitTokenWithComment(143, node.importClause.end, writeKeyword, node);
+                emitTokenWithComment(143 /* FromKeyword */, node.importClause.end, writeKeyword, node);
                 writeSpace();
             }
             emitExpression(node.moduleSpecifier);
@@ -63281,15 +78990,15 @@ var ts;
         function emitImportClause(node) {
             emit(node.name);
             if (node.name && node.namedBindings) {
-                emitTokenWithComment(26, node.name.end, writePunctuation, node);
+                emitTokenWithComment(26 /* CommaToken */, node.name.end, writePunctuation, node);
                 writeSpace();
             }
             emit(node.namedBindings);
         }
         function emitNamespaceImport(node) {
-            var asPos = emitTokenWithComment(39, node.pos, writePunctuation, node);
+            var asPos = emitTokenWithComment(39 /* AsteriskToken */, node.pos, writePunctuation, node);
             writeSpace();
-            emitTokenWithComment(118, asPos, writeKeyword, node);
+            emitTokenWithComment(118 /* AsKeyword */, asPos, writeKeyword, node);
             writeSpace();
             emit(node.name);
         }
@@ -63300,42 +79009,42 @@ var ts;
             emitImportOrExportSpecifier(node);
         }
         function emitExportAssignment(node) {
-            var nextPos = emitTokenWithComment(84, node.pos, writeKeyword, node);
+            var nextPos = emitTokenWithComment(84 /* ExportKeyword */, node.pos, writeKeyword, node);
             writeSpace();
             if (node.isExportEquals) {
-                emitTokenWithComment(58, nextPos, writeOperator, node);
+                emitTokenWithComment(58 /* EqualsToken */, nextPos, writeOperator, node);
             }
             else {
-                emitTokenWithComment(79, nextPos, writeKeyword, node);
+                emitTokenWithComment(79 /* DefaultKeyword */, nextPos, writeKeyword, node);
             }
             writeSpace();
             emitExpression(node.expression);
             writeSemicolon();
         }
         function emitExportDeclaration(node) {
-            var nextPos = emitTokenWithComment(84, node.pos, writeKeyword, node);
+            var nextPos = emitTokenWithComment(84 /* ExportKeyword */, node.pos, writeKeyword, node);
             writeSpace();
             if (node.exportClause) {
                 emit(node.exportClause);
             }
             else {
-                nextPos = emitTokenWithComment(39, nextPos, writePunctuation, node);
+                nextPos = emitTokenWithComment(39 /* AsteriskToken */, nextPos, writePunctuation, node);
             }
             if (node.moduleSpecifier) {
                 writeSpace();
                 var fromPos = node.exportClause ? node.exportClause.end : nextPos;
-                emitTokenWithComment(143, fromPos, writeKeyword, node);
+                emitTokenWithComment(143 /* FromKeyword */, fromPos, writeKeyword, node);
                 writeSpace();
                 emitExpression(node.moduleSpecifier);
             }
             writeSemicolon();
         }
         function emitNamespaceExportDeclaration(node) {
-            var nextPos = emitTokenWithComment(84, node.pos, writeKeyword, node);
+            var nextPos = emitTokenWithComment(84 /* ExportKeyword */, node.pos, writeKeyword, node);
             writeSpace();
-            nextPos = emitTokenWithComment(118, nextPos, writeKeyword, node);
+            nextPos = emitTokenWithComment(118 /* AsKeyword */, nextPos, writeKeyword, node);
             writeSpace();
-            nextPos = emitTokenWithComment(130, nextPos, writeKeyword, node);
+            nextPos = emitTokenWithComment(130 /* NamespaceKeyword */, nextPos, writeKeyword, node);
             writeSpace();
             emit(node.name);
             writeSemicolon();
@@ -63348,27 +79057,33 @@ var ts;
         }
         function emitNamedImportsOrExports(node) {
             writePunctuation("{");
-            emitList(node, node.elements, 262576);
+            emitList(node, node.elements, 262576 /* NamedImportsOrExportsElements */);
             writePunctuation("}");
         }
         function emitImportOrExportSpecifier(node) {
             if (node.propertyName) {
                 emit(node.propertyName);
                 writeSpace();
-                emitTokenWithComment(118, node.propertyName.end, writeKeyword, node);
+                emitTokenWithComment(118 /* AsKeyword */, node.propertyName.end, writeKeyword, node);
                 writeSpace();
             }
             emit(node.name);
         }
+        //
+        // Module references
+        //
         function emitExternalModuleReference(node) {
             writeKeyword("require");
             writePunctuation("(");
             emitExpression(node.expression);
             writePunctuation(")");
         }
+        //
+        // JSX
+        //
         function emitJsxElement(node) {
             emit(node.openingElement);
-            emitList(node, node.children, 131072);
+            emitList(node, node.children, 131072 /* JsxElementOrFragmentChildren */);
             emit(node.closingElement);
         }
         function emitJsxSelfClosingElement(node) {
@@ -63380,7 +79095,7 @@ var ts;
         }
         function emitJsxFragment(node) {
             emit(node.openingFragment);
-            emitList(node, node.children, 131072);
+            emitList(node, node.children, 131072 /* JsxElementOrFragmentChildren */);
             emit(node.closingFragment);
         }
         function emitJsxOpeningElementOrFragment(node) {
@@ -63396,7 +79111,7 @@ var ts;
         }
         function emitJsxText(node) {
             commitPendingSemicolon();
-            writer.writeLiteral(getTextOfNode(node, true));
+            writer.writeLiteral(getTextOfNode(node, /*includeTrivia*/ true));
         }
         function emitJsxClosingElementOrFragment(node) {
             writePunctuation("</");
@@ -63406,11 +79121,11 @@ var ts;
             writePunctuation(">");
         }
         function emitJsxAttributes(node) {
-            emitList(node, node.properties, 131328);
+            emitList(node, node.properties, 131328 /* JsxElementAttributes */);
         }
         function emitJsxAttribute(node) {
             emit(node.name);
-            emitNodeWithPrefix("=", writePunctuation, node.initializer, emit);
+            emitNodeWithPrefix("=", writePunctuation, node.initializer, emit); // TODO: GH#18217
         }
         function emitJsxSpreadAttribute(node) {
             writePunctuation("{...");
@@ -63426,36 +79141,41 @@ var ts;
             }
         }
         function emitJsxTagName(node) {
-            if (node.kind === 71) {
+            if (node.kind === 71 /* Identifier */) {
                 emitExpression(node);
             }
             else {
                 emit(node);
             }
         }
+        //
+        // Clauses
+        //
         function emitCaseClause(node) {
-            emitTokenWithComment(73, node.pos, writeKeyword, node);
+            emitTokenWithComment(73 /* CaseKeyword */, node.pos, writeKeyword, node);
             writeSpace();
             emitExpression(node.expression);
             emitCaseOrDefaultClauseRest(node, node.statements, node.expression.end);
         }
         function emitDefaultClause(node) {
-            var pos = emitTokenWithComment(79, node.pos, writeKeyword, node);
+            var pos = emitTokenWithComment(79 /* DefaultKeyword */, node.pos, writeKeyword, node);
             emitCaseOrDefaultClauseRest(node, node.statements, pos);
         }
         function emitCaseOrDefaultClauseRest(parentNode, statements, colonPos) {
             var emitAsSingleStatement = statements.length === 1 &&
-                (ts.nodeIsSynthesized(parentNode) ||
+                (
+                // treat synthesized nodes as located on the same line for emit purposes
+                ts.nodeIsSynthesized(parentNode) ||
                     ts.nodeIsSynthesized(statements[0]) ||
                     ts.rangeStartPositionsAreOnSameLine(parentNode, statements[0], currentSourceFile));
-            var format = 81985;
+            var format = 81985 /* CaseOrDefaultClauseStatements */;
             if (emitAsSingleStatement) {
-                writeToken(56, colonPos, writePunctuation, parentNode);
+                writeToken(56 /* ColonToken */, colonPos, writePunctuation, parentNode);
                 writeSpace();
-                format &= ~(1 | 64);
+                format &= ~(1 /* MultiLine */ | 64 /* Indented */);
             }
             else {
-                emitTokenWithComment(56, colonPos, writePunctuation, parentNode);
+                emitTokenWithComment(56 /* ColonToken */, colonPos, writePunctuation, parentNode);
             }
             emitList(parentNode, statements, format);
         }
@@ -63463,25 +79183,35 @@ var ts;
             writeSpace();
             writeTokenText(node.token, writeKeyword);
             writeSpace();
-            emitList(node, node.types, 272);
+            emitList(node, node.types, 272 /* HeritageClauseTypes */);
         }
         function emitCatchClause(node) {
-            var openParenPos = emitTokenWithComment(74, node.pos, writeKeyword, node);
+            var openParenPos = emitTokenWithComment(74 /* CatchKeyword */, node.pos, writeKeyword, node);
             writeSpace();
             if (node.variableDeclaration) {
-                emitTokenWithComment(19, openParenPos, writePunctuation, node);
+                emitTokenWithComment(19 /* OpenParenToken */, openParenPos, writePunctuation, node);
                 emit(node.variableDeclaration);
-                emitTokenWithComment(20, node.variableDeclaration.end, writePunctuation, node);
+                emitTokenWithComment(20 /* CloseParenToken */, node.variableDeclaration.end, writePunctuation, node);
                 writeSpace();
             }
             emit(node.block);
         }
+        //
+        // Property assignments
+        //
         function emitPropertyAssignment(node) {
             emit(node.name);
             writePunctuation(":");
             writeSpace();
+            // This is to ensure that we emit comment in the following case:
+            //      For example:
+            //          obj = {
+            //              id: /*comment1*/ ()=>void
+            //          }
+            // "comment1" is not considered to be leading comment for node.initializer
+            // but rather a trailing comment on the previous node.
             var initializer = node.initializer;
-            if (emitTrailingCommentsOfPosition && (ts.getEmitFlags(initializer) & 512) === 0) {
+            if (emitTrailingCommentsOfPosition && (ts.getEmitFlags(initializer) & 512 /* NoLeadingComments */) === 0) {
                 var commentRange = ts.getCommentRange(initializer);
                 emitTrailingCommentsOfPosition(commentRange.pos);
             }
@@ -63502,14 +79232,22 @@ var ts;
                 emitExpression(node.expression);
             }
         }
+        //
+        // Enum
+        //
         function emitEnumMember(node) {
             emit(node.name);
             emitInitializer(node.initializer, node.name.end, node);
         }
+        //
+        // Top-level nodes
+        //
         function emitSourceFile(node) {
             writeLine();
             var statements = node.statements;
             if (emitBodyWithDetachedComments) {
+                // Emit detached comment if there are no prologue directives or if the first node is synthesized.
+                // The synthesized node will have no leading comment so some comments may be missed.
                 var shouldEmitDetachedComment = statements.length === 0 ||
                     !ts.isPrologueDirective(statements[0]) ||
                     ts.nodeIsSynthesized(statements[0]);
@@ -63566,15 +79304,20 @@ var ts;
             emitHelpers(node);
             var index = ts.findIndex(statements, function (statement) { return !ts.isPrologueDirective(statement); });
             emitTripleSlashDirectivesIfNeeded(node);
-            emitList(node, statements, 1, index === -1 ? statements.length : index);
+            emitList(node, statements, 1 /* MultiLine */, index === -1 ? statements.length : index);
             popNameGenerationScope(node);
         }
+        // Transformation nodes
         function emitPartiallyEmittedExpression(node) {
             emitExpression(node.expression);
         }
         function emitCommaList(node) {
-            emitExpressionList(node, node.elements, 272);
+            emitExpressionList(node, node.elements, 272 /* CommaListElements */);
         }
+        /**
+         * Emits any prologue directives at the start of a Statement list, returning the
+         * number of prologue directives written to the output.
+         */
         function emitPrologueDirectives(statements, startWithNewLine, seenPrologueDirectives) {
             for (var i = 0; i < statements.length; i++) {
                 var statement = statements[i];
@@ -63591,6 +79334,7 @@ var ts;
                     }
                 }
                 else {
+                    // return index of the first non prologue directive
                     return i;
                 }
             }
@@ -63606,7 +79350,7 @@ var ts;
                 for (var _a = 0, _b = sourceFileOrBundle.sourceFiles; _a < _b.length; _a++) {
                     var sourceFile = _b[_a];
                     setSourceFile(sourceFile);
-                    emitPrologueDirectives(sourceFile.statements, true, seenPrologueDirectives);
+                    emitPrologueDirectives(sourceFile.statements, /*startWithNewLine*/ true, seenPrologueDirectives);
                 }
             }
         }
@@ -63622,12 +79366,16 @@ var ts;
             else {
                 for (var _a = 0, _b = sourceFileOrBundle.sourceFiles; _a < _b.length; _a++) {
                     var sourceFile = _b[_a];
+                    // Emit only the first encountered shebang
                     if (emitShebangIfNeeded(sourceFile)) {
                         break;
                     }
                 }
             }
         }
+        //
+        // Helpers
+        //
         function emitNodeWithWriter(node, writer) {
             if (!node)
                 return;
@@ -63638,7 +79386,7 @@ var ts;
         }
         function emitModifiers(node, modifiers) {
             if (modifiers && modifiers.length) {
-                emitList(node, modifiers, 131328);
+                emitList(node, modifiers, 131328 /* Modifiers */);
                 writeSpace();
             }
         }
@@ -63652,7 +79400,7 @@ var ts;
         function emitInitializer(node, equalCommentStartPos, container) {
             if (node) {
                 writeSpace();
-                emitTokenWithComment(58, equalCommentStartPos, writeOperator, container);
+                emitTokenWithComment(58 /* EqualsToken */, equalCommentStartPos, writeOperator, container);
                 writeSpace();
                 emitExpression(node);
             }
@@ -63682,7 +79430,7 @@ var ts;
             }
         }
         function emitEmbeddedStatement(parent, node) {
-            if (ts.isBlock(node) || ts.getEmitFlags(parent) & 1) {
+            if (ts.isBlock(node) || ts.getEmitFlags(parent) & 1 /* SingleLine */) {
                 writeSpace();
                 emit(node);
             }
@@ -63694,65 +79442,65 @@ var ts;
             }
         }
         function emitDecorators(parentNode, decorators) {
-            emitList(parentNode, decorators, 24577);
+            emitList(parentNode, decorators, 24577 /* Decorators */);
         }
         function emitTypeArguments(parentNode, typeArguments) {
-            emitList(parentNode, typeArguments, 26896);
+            emitList(parentNode, typeArguments, 26896 /* TypeArguments */);
         }
         function emitTypeParameters(parentNode, typeParameters) {
-            if (ts.isFunctionLike(parentNode) && parentNode.typeArguments) {
+            if (ts.isFunctionLike(parentNode) && parentNode.typeArguments) { // Quick info uses type arguments in place of type parameters on instantiated signatures
                 return emitTypeArguments(parentNode, parentNode.typeArguments);
             }
-            emitList(parentNode, typeParameters, 26896);
+            emitList(parentNode, typeParameters, 26896 /* TypeParameters */);
         }
         function emitParameters(parentNode, parameters) {
-            emitList(parentNode, parameters, 1296);
+            emitList(parentNode, parameters, 1296 /* Parameters */);
         }
         function canEmitSimpleArrowHead(parentNode, parameters) {
             var parameter = ts.singleOrUndefined(parameters);
             return parameter
-                && parameter.pos === parentNode.pos
-                && !(ts.isArrowFunction(parentNode) && parentNode.type)
-                && !ts.some(parentNode.decorators)
-                && !ts.some(parentNode.modifiers)
-                && !ts.some(parentNode.typeParameters)
-                && !ts.some(parameter.decorators)
-                && !ts.some(parameter.modifiers)
-                && !parameter.dotDotDotToken
-                && !parameter.questionToken
-                && !parameter.type
-                && !parameter.initializer
-                && ts.isIdentifier(parameter.name);
+                && parameter.pos === parentNode.pos // may not have parsed tokens between parent and parameter
+                && !(ts.isArrowFunction(parentNode) && parentNode.type) // arrow function may not have return type annotation
+                && !ts.some(parentNode.decorators) // parent may not have decorators
+                && !ts.some(parentNode.modifiers) // parent may not have modifiers
+                && !ts.some(parentNode.typeParameters) // parent may not have type parameters
+                && !ts.some(parameter.decorators) // parameter may not have decorators
+                && !ts.some(parameter.modifiers) // parameter may not have modifiers
+                && !parameter.dotDotDotToken // parameter may not be rest
+                && !parameter.questionToken // parameter may not be optional
+                && !parameter.type // parameter may not have a type annotation
+                && !parameter.initializer // parameter may not have an initializer
+                && ts.isIdentifier(parameter.name); // parameter name must be identifier
         }
         function emitParametersForArrow(parentNode, parameters) {
             if (canEmitSimpleArrowHead(parentNode, parameters)) {
-                emitList(parentNode, parameters, 1296 & ~1024);
+                emitList(parentNode, parameters, 1296 /* Parameters */ & ~1024 /* Parenthesis */);
             }
             else {
                 emitParameters(parentNode, parameters);
             }
         }
         function emitParametersForIndexSignature(parentNode, parameters) {
-            emitList(parentNode, parameters, 4432);
+            emitList(parentNode, parameters, 4432 /* IndexSignatureParameters */);
         }
         function emitList(parentNode, children, format, start, count) {
             emitNodeList(emit, parentNode, children, format, start, count);
         }
         function emitExpressionList(parentNode, children, format, start, count) {
-            emitNodeList(emitExpression, parentNode, children, format, start, count);
+            emitNodeList(emitExpression, parentNode, children, format, start, count); // TODO: GH#18217
         }
         function writeDelimiter(format) {
-            switch (format & 28) {
-                case 0:
+            switch (format & 28 /* DelimitersMask */) {
+                case 0 /* None */:
                     break;
-                case 16:
+                case 16 /* CommaDelimited */:
                     writePunctuation(",");
                     break;
-                case 4:
+                case 4 /* BarDelimited */:
                     writeSpace();
                     writePunctuation("|");
                     break;
-                case 8:
+                case 8 /* AmpersandDelimited */:
                     writeSpace();
                     writePunctuation("&");
                     break;
@@ -63762,11 +79510,11 @@ var ts;
             if (start === void 0) { start = 0; }
             if (count === void 0) { count = children ? children.length - start : 0; }
             var isUndefined = children === undefined;
-            if (isUndefined && format & 8192) {
+            if (isUndefined && format & 8192 /* OptionalIfUndefined */) {
                 return;
             }
             var isEmpty = children === undefined || start >= children.length || count === 0;
-            if (isEmpty && format & 16384) {
+            if (isEmpty && format & 16384 /* OptionalIfEmpty */) {
                 if (onBeforeEmitNodeArray) {
                     onBeforeEmitNodeArray(children);
                 }
@@ -63775,57 +79523,73 @@ var ts;
                 }
                 return;
             }
-            if (format & 7680) {
+            if (format & 7680 /* BracketsMask */) {
                 writePunctuation(getOpeningBracket(format));
                 if (isEmpty && !isUndefined) {
-                    emitTrailingCommentsOfPosition(children.pos, true);
+                    // TODO: GH#18217
+                    emitTrailingCommentsOfPosition(children.pos, /*prefixSpace*/ true); // Emit comments within empty bracketed lists
                 }
             }
             if (onBeforeEmitNodeArray) {
                 onBeforeEmitNodeArray(children);
             }
             if (isEmpty) {
-                if (format & 1) {
+                // Write a line terminator if the parent node was multi-line
+                if (format & 1 /* MultiLine */) {
                     writeLine();
                 }
-                else if (format & 128 && !(format & 262144)) {
+                else if (format & 128 /* SpaceBetweenBraces */ && !(format & 262144 /* NoSpaceIfEmpty */)) {
                     writeSpace();
                 }
             }
             else {
-                var mayEmitInterveningComments = (format & 131072) === 0;
+                // Write the opening line terminator or leading whitespace.
+                var mayEmitInterveningComments = (format & 131072 /* NoInterveningComments */) === 0;
                 var shouldEmitInterveningComments = mayEmitInterveningComments;
-                if (shouldWriteLeadingLineTerminator(parentNode, children, format)) {
+                if (shouldWriteLeadingLineTerminator(parentNode, children, format)) { // TODO: GH#18217
                     writeLine();
                     shouldEmitInterveningComments = false;
                 }
-                else if (format & 128) {
+                else if (format & 128 /* SpaceBetweenBraces */) {
                     writeSpace();
                 }
-                if (format & 64) {
+                // Increase the indent, if requested.
+                if (format & 64 /* Indented */) {
                     increaseIndent();
                 }
+                // Emit each child.
                 var previousSibling = void 0;
                 var shouldDecreaseIndentAfterEmit = false;
                 for (var i = 0; i < count; i++) {
                     var child = children[start + i];
+                    // Write the delimiter if this is not the first node.
                     if (previousSibling) {
-                        if (format & 28 && previousSibling.end !== parentNode.end) {
+                        // i.e
+                        //      function commentedParameters(
+                        //          /* Parameter a */
+                        //          a
+                        //          /* End of parameter a */ -> this comment isn't considered to be trailing comment of parameter "a" due to newline
+                        //          ,
+                        if (format & 28 /* DelimitersMask */ && previousSibling.end !== parentNode.end) {
                             emitLeadingCommentsOfPosition(previousSibling.end);
                         }
                         writeDelimiter(format);
+                        // Write either a line terminator or whitespace to separate the elements.
                         if (shouldWriteSeparatingLineTerminator(previousSibling, child, format)) {
-                            if ((format & (3 | 64)) === 0) {
+                            // If a synthesized node in a single-line list starts on a new
+                            // line, we should increase the indent.
+                            if ((format & (3 /* LinesMask */ | 64 /* Indented */)) === 0 /* SingleLine */) {
                                 increaseIndent();
                                 shouldDecreaseIndentAfterEmit = true;
                             }
                             writeLine();
                             shouldEmitInterveningComments = false;
                         }
-                        else if (previousSibling && format & 256) {
+                        else if (previousSibling && format & 256 /* SpaceBetweenSiblings */) {
                             writeSpace();
                         }
                     }
+                    // Emit this child.
                     if (shouldEmitInterveningComments) {
                         if (emitTrailingCommentsOfPosition) {
                             var commentRange = ts.getCommentRange(child);
@@ -63842,29 +79606,39 @@ var ts;
                     }
                     previousSibling = child;
                 }
-                var hasTrailingComma = (format & 32) && children.hasTrailingComma;
-                if (format & 16 && hasTrailingComma) {
+                // Write a trailing comma, if requested.
+                var hasTrailingComma = (format & 32 /* AllowTrailingComma */) && children.hasTrailingComma;
+                if (format & 16 /* CommaDelimited */ && hasTrailingComma) {
                     writePunctuation(",");
                 }
-                if (previousSibling && format & 28 && previousSibling.end !== parentNode.end && !(ts.getEmitFlags(previousSibling) & 1024)) {
+                // Emit any trailing comment of the last element in the list
+                // i.e
+                //       var array = [...
+                //          2
+                //          /* end of element 2 */
+                //       ];
+                if (previousSibling && format & 28 /* DelimitersMask */ && previousSibling.end !== parentNode.end && !(ts.getEmitFlags(previousSibling) & 1024 /* NoTrailingComments */)) {
                     emitLeadingCommentsOfPosition(previousSibling.end);
                 }
-                if (format & 64) {
+                // Decrease the indent, if requested.
+                if (format & 64 /* Indented */) {
                     decreaseIndent();
                 }
+                // Write the closing line terminator or closing whitespace.
                 if (shouldWriteClosingLineTerminator(parentNode, children, format)) {
                     writeLine();
                 }
-                else if (format & 128) {
+                else if (format & 128 /* SpaceBetweenBraces */) {
                     writeSpace();
                 }
             }
             if (onAfterEmitNodeArray) {
                 onAfterEmitNodeArray(children);
             }
-            if (format & 7680) {
+            if (format & 7680 /* BracketsMask */) {
                 if (isEmpty && !isUndefined) {
-                    emitLeadingCommentsOfPosition(children.end);
+                    // TODO: GH#18217
+                    emitLeadingCommentsOfPosition(children.end); // Emit leading comments within empty lists
                 }
                 writePunctuation(getClosingBracket(format));
             }
@@ -63953,7 +79727,7 @@ var ts;
             return pos < 0 ? pos : pos + tokenString.length;
         }
         function writeLineOrSpace(node) {
-            if (ts.getEmitFlags(node) & 1) {
+            if (ts.getEmitFlags(node) & 1 /* SingleLine */) {
                 writeSpace();
             }
             else {
@@ -63963,8 +79737,8 @@ var ts;
         function writeLines(text) {
             var lines = text.split(/\r\n?|\n/g);
             var indentation = ts.guessIndentation(lines);
-            for (var _a = 0, lines_2 = lines; _a < lines_2.length; _a++) {
-                var lineText = lines_2[_a];
+            for (var _a = 0, lines_1 = lines; _a < lines_1.length; _a++) {
+                var lineText = lines_1[_a];
                 var line = indentation ? lineText.slice(indentation) : lineText;
                 if (line.length) {
                     writeLine();
@@ -63982,6 +79756,10 @@ var ts;
                 write(valueToWriteWhenNotIndenting);
             }
         }
+        // Helper function to decrease the indent if we previously indented.  Allows multiple
+        // previous indent values to be considered at a time.  This also allows caller to just
+        // call this once, passing in all their appropriate indent values, instead of needing
+        // to call this helper function multiple times.
         function decreaseIndentIf(value1, value2) {
             if (value1) {
                 decreaseIndent();
@@ -63991,11 +79769,11 @@ var ts;
             }
         }
         function shouldWriteLeadingLineTerminator(parentNode, children, format) {
-            if (format & 1) {
+            if (format & 1 /* MultiLine */) {
                 return true;
             }
-            if (format & 2) {
-                if (format & 32768) {
+            if (format & 2 /* PreserveLines */) {
+                if (format & 32768 /* PreferNewLine */) {
                     return true;
                 }
                 var firstChild = children[0];
@@ -64014,10 +79792,10 @@ var ts;
             }
         }
         function shouldWriteSeparatingLineTerminator(previousNode, nextNode, format) {
-            if (format & 1) {
+            if (format & 1 /* MultiLine */) {
                 return true;
             }
-            else if (format & 2) {
+            else if (format & 2 /* PreserveLines */) {
                 if (previousNode === undefined || nextNode === undefined) {
                     return false;
                 }
@@ -64033,11 +79811,11 @@ var ts;
             }
         }
         function shouldWriteClosingLineTerminator(parentNode, children, format) {
-            if (format & 1) {
-                return (format & 65536) === 0;
+            if (format & 1 /* MultiLine */) {
+                return (format & 65536 /* NoTrailingNewLine */) === 0;
             }
-            else if (format & 2) {
-                if (format & 32768) {
+            else if (format & 2 /* PreserveLines */) {
+                if (format & 32768 /* PreferNewLine */) {
                     return true;
                 }
                 var lastChild = ts.lastOrUndefined(children);
@@ -64059,16 +79837,17 @@ var ts;
             if (ts.nodeIsSynthesized(node)) {
                 var startsOnNewLine = ts.getStartsOnNewLine(node);
                 if (startsOnNewLine === undefined) {
-                    return (format & 32768) !== 0;
+                    return (format & 32768 /* PreferNewLine */) !== 0;
                 }
                 return startsOnNewLine;
             }
-            return (format & 32768) !== 0;
+            return (format & 32768 /* PreferNewLine */) !== 0;
         }
         function needsIndentation(parent, node1, node2) {
             parent = skipSynthesizedParentheses(parent);
             node1 = skipSynthesizedParentheses(node1);
             node2 = skipSynthesizedParentheses(node2);
+            // Always use a newline for synthesized code if the synthesizer desires it.
             if (ts.getStartsOnNewLine(node2)) {
                 return true;
             }
@@ -64082,7 +79861,7 @@ var ts;
                 && ts.rangeEndIsOnSameLineAsRangeStart(block, block, currentSourceFile);
         }
         function skipSynthesizedParentheses(node) {
-            while (node.kind === 191 && ts.nodeIsSynthesized(node)) {
+            while (node.kind === 191 /* ParenthesizedExpression */ && ts.nodeIsSynthesized(node)) {
                 node = node.expression;
             }
             return node;
@@ -64094,7 +79873,7 @@ var ts;
             else if (ts.isIdentifier(node) && (ts.nodeIsSynthesized(node) || !node.parent || !currentSourceFile || (node.parent && currentSourceFile && ts.getSourceFileOfNode(node) !== ts.getOriginalNode(currentSourceFile)))) {
                 return ts.idText(node);
             }
-            else if (node.kind === 9 && node.textSourceNode) {
+            else if (node.kind === 9 /* StringLiteral */ && node.textSourceNode) {
                 return getTextOfNode(node.textSourceNode, includeTrivia);
             }
             else if (ts.isLiteralExpression(node) && (ts.nodeIsSynthesized(node) || !node.parent)) {
@@ -64103,10 +79882,10 @@ var ts;
             return ts.getSourceTextOfNodeFromSourceFile(currentSourceFile, node, includeTrivia);
         }
         function getLiteralTextOfNode(node) {
-            if (node.kind === 9 && node.textSourceNode) {
+            if (node.kind === 9 /* StringLiteral */ && node.textSourceNode) {
                 var textSourceNode = node.textSourceNode;
                 if (ts.isIdentifier(textSourceNode)) {
-                    return ts.getEmitFlags(node) & 16777216 ?
+                    return ts.getEmitFlags(node) & 16777216 /* NoAsciiEscaping */ ?
                         "\"" + ts.escapeString(getTextOfNode(textSourceNode)) + "\"" :
                         "\"" + ts.escapeNonAsciiString(getTextOfNode(textSourceNode)) + "\"";
                 }
@@ -64116,16 +79895,22 @@ var ts;
             }
             return ts.getLiteralText(node, currentSourceFile);
         }
+        /**
+         * Push a new name generation scope.
+         */
         function pushNameGenerationScope(node) {
-            if (node && ts.getEmitFlags(node) & 524288) {
+            if (node && ts.getEmitFlags(node) & 524288 /* ReuseTempVariableScope */) {
                 return;
             }
             tempFlagsStack.push(tempFlags);
             tempFlags = 0;
             reservedNamesStack.push(reservedNames);
         }
+        /**
+         * Pop the current name generation scope.
+         */
         function popNameGenerationScope(node) {
-            if (node && ts.getEmitFlags(node) & 524288) {
+            if (node && ts.getEmitFlags(node) & 524288 /* ReuseTempVariableScope */) {
                 return;
             }
             tempFlags = tempFlagsStack.pop();
@@ -64141,81 +79926,81 @@ var ts;
             if (!node)
                 return;
             switch (node.kind) {
-                case 213:
+                case 213 /* Block */:
                     ts.forEach(node.statements, generateNames);
                     break;
-                case 228:
-                case 226:
-                case 218:
-                case 219:
+                case 228 /* LabeledStatement */:
+                case 226 /* WithStatement */:
+                case 218 /* DoStatement */:
+                case 219 /* WhileStatement */:
                     generateNames(node.statement);
                     break;
-                case 217:
+                case 217 /* IfStatement */:
                     generateNames(node.thenStatement);
                     generateNames(node.elseStatement);
                     break;
-                case 220:
-                case 222:
-                case 221:
+                case 220 /* ForStatement */:
+                case 222 /* ForOfStatement */:
+                case 221 /* ForInStatement */:
                     generateNames(node.initializer);
                     generateNames(node.statement);
                     break;
-                case 227:
+                case 227 /* SwitchStatement */:
                     generateNames(node.caseBlock);
                     break;
-                case 241:
+                case 241 /* CaseBlock */:
                     ts.forEach(node.clauses, generateNames);
                     break;
-                case 266:
-                case 267:
+                case 266 /* CaseClause */:
+                case 267 /* DefaultClause */:
                     ts.forEach(node.statements, generateNames);
                     break;
-                case 230:
+                case 230 /* TryStatement */:
                     generateNames(node.tryBlock);
                     generateNames(node.catchClause);
                     generateNames(node.finallyBlock);
                     break;
-                case 269:
+                case 269 /* CatchClause */:
                     generateNames(node.variableDeclaration);
                     generateNames(node.block);
                     break;
-                case 214:
+                case 214 /* VariableStatement */:
                     generateNames(node.declarationList);
                     break;
-                case 233:
+                case 233 /* VariableDeclarationList */:
                     ts.forEach(node.declarations, generateNames);
                     break;
-                case 232:
-                case 149:
-                case 182:
-                case 235:
+                case 232 /* VariableDeclaration */:
+                case 149 /* Parameter */:
+                case 182 /* BindingElement */:
+                case 235 /* ClassDeclaration */:
                     generateNameIfNeeded(node.name);
                     break;
-                case 234:
+                case 234 /* FunctionDeclaration */:
                     generateNameIfNeeded(node.name);
-                    if (ts.getEmitFlags(node) & 524288) {
+                    if (ts.getEmitFlags(node) & 524288 /* ReuseTempVariableScope */) {
                         ts.forEach(node.parameters, generateNames);
                         generateNames(node.body);
                     }
                     break;
-                case 180:
-                case 181:
+                case 180 /* ObjectBindingPattern */:
+                case 181 /* ArrayBindingPattern */:
                     ts.forEach(node.elements, generateNames);
                     break;
-                case 244:
+                case 244 /* ImportDeclaration */:
                     generateNames(node.importClause);
                     break;
-                case 245:
+                case 245 /* ImportClause */:
                     generateNameIfNeeded(node.name);
                     generateNames(node.namedBindings);
                     break;
-                case 246:
+                case 246 /* NamespaceImport */:
                     generateNameIfNeeded(node.name);
                     break;
-                case 247:
+                case 247 /* NamedImports */:
                     ts.forEach(node.elements, generateNames);
                     break;
-                case 248:
+                case 248 /* ImportSpecifier */:
                     generateNameIfNeeded(node.propertyName || node.name);
                     break;
             }
@@ -64224,12 +80009,12 @@ var ts;
             if (!node)
                 return;
             switch (node.kind) {
-                case 270:
-                case 271:
-                case 152:
-                case 154:
-                case 156:
-                case 157:
+                case 270 /* PropertyAssignment */:
+                case 271 /* ShorthandPropertyAssignment */:
+                case 152 /* PropertyDeclaration */:
+                case 154 /* MethodDeclaration */:
+                case 156 /* GetAccessor */:
+                case 157 /* SetAccessor */:
                     generateNameIfNeeded(node.name);
                     break;
             }
@@ -64244,11 +80029,18 @@ var ts;
                 }
             }
         }
+        /**
+         * Generate the text for a generated identifier.
+         */
         function generateName(name) {
-            if ((name.autoGenerateFlags & 7) === 4) {
+            if ((name.autoGenerateFlags & 7 /* KindMask */) === 4 /* Node */) {
+                // Node names generate unique names based on their original node
+                // and are cached based on that node's id.
                 return generateNameCached(getNodeForGeneratedName(name), name.autoGenerateFlags);
             }
             else {
+                // Auto, Loop, and Unique names are cached based on their unique
+                // autoGenerateId.
                 var autoGenerateId = name.autoGenerateId;
                 return autoGeneratedIdToGeneratedName[autoGenerateId] || (autoGeneratedIdToGeneratedName[autoGenerateId] = makeName(name));
             }
@@ -64257,28 +80049,44 @@ var ts;
             var nodeId = ts.getNodeId(node);
             return nodeIdToGeneratedName[nodeId] || (nodeIdToGeneratedName[nodeId] = generateNameForNode(node, flags));
         }
+        /**
+         * Returns a value indicating whether a name is unique globally, within the current file,
+         * or within the NameGenerator.
+         */
         function isUniqueName(name) {
             return isFileLevelUniqueName(name)
                 && !generatedNames.has(name)
                 && !(reservedNames && reservedNames.has(name));
         }
+        /**
+         * Returns a value indicating whether a name is unique globally or within the current file.
+         */
         function isFileLevelUniqueName(name) {
             return currentSourceFile ? ts.isFileLevelUniqueName(currentSourceFile, name, hasGlobalName) : true;
         }
+        /**
+         * Returns a value indicating whether a name is unique within a container.
+         */
         function isUniqueLocalName(name, container) {
             for (var node = container; ts.isNodeDescendantOf(node, container); node = node.nextContainer) {
                 if (node.locals) {
                     var local = node.locals.get(ts.escapeLeadingUnderscores(name));
-                    if (local && local.flags & (67216319 | 1048576 | 2097152)) {
+                    // We conservatively include alias symbols to cover cases where they're emitted as locals
+                    if (local && local.flags & (67216319 /* Value */ | 1048576 /* ExportValue */ | 2097152 /* Alias */)) {
                         return false;
                     }
                 }
             }
             return true;
         }
+        /**
+         * Return the next available name in the pattern _a ... _z, _0, _1, ...
+         * TempFlags._i or TempFlags._n may be used to express a preference for that dedicated name.
+         * Note that names generated by makeTempVariableName and makeUniqueName will never conflict.
+         */
         function makeTempVariableName(flags, reservedInNestedScopes) {
             if (flags && !(tempFlags & flags)) {
-                var name = flags === 268435456 ? "_i" : "_n";
+                var name = flags === 268435456 /* _i */ ? "_i" : "_n";
                 if (isUniqueName(name)) {
                     tempFlags |= flags;
                     if (reservedInNestedScopes) {
@@ -64288,11 +80096,12 @@ var ts;
                 }
             }
             while (true) {
-                var count = tempFlags & 268435455;
+                var count = tempFlags & 268435455 /* CountMask */;
                 tempFlags++;
+                // Skip over 'i' and 'n'
                 if (count !== 8 && count !== 13) {
                     var name = count < 26
-                        ? "_" + String.fromCharCode(97 + count)
+                        ? "_" + String.fromCharCode(97 /* a */ + count)
                         : "_" + (count - 26);
                     if (isUniqueName(name)) {
                         if (reservedInNestedScopes) {
@@ -64303,6 +80112,13 @@ var ts;
                 }
             }
         }
+        /**
+         * Generate a name that is unique within the current file and doesn't conflict with any names
+         * in global scope. The name is formed by adding an '_n' suffix to the specified base name,
+         * where n is a positive integer. Note that names generated by makeTempVariableName and
+         * makeUniqueName are guaranteed to never conflict.
+         * If `optimistic` is set, the first instance will use 'baseName' verbatim instead of 'baseName_1'
+         */
         function makeUniqueName(baseName, checkFn, optimistic, scoped) {
             if (checkFn === void 0) { checkFn = isUniqueName; }
             if (optimistic) {
@@ -64316,7 +80132,8 @@ var ts;
                     return baseName;
                 }
             }
-            if (baseName.charCodeAt(baseName.length - 1) !== 95) {
+            // Find the first unique 'name_n', where n is a positive number
+            if (baseName.charCodeAt(baseName.length - 1) !== 95 /* _ */) {
                 baseName += "_";
             }
             var i = 1;
@@ -64335,21 +80152,34 @@ var ts;
             }
         }
         function makeFileLevelOptmiisticUniqueName(name) {
-            return makeUniqueName(name, isFileLevelUniqueName, true);
+            return makeUniqueName(name, isFileLevelUniqueName, /*optimistic*/ true);
         }
+        /**
+         * Generates a unique name for a ModuleDeclaration or EnumDeclaration.
+         */
         function generateNameForModuleOrEnum(node) {
             var name = getTextOfNode(node.name);
+            // Use module/enum name itself if it is unique, otherwise make a unique variation
             return isUniqueLocalName(name, node) ? name : makeUniqueName(name);
         }
+        /**
+         * Generates a unique name for an ImportDeclaration or ExportDeclaration.
+         */
         function generateNameForImportOrExportDeclaration(node) {
-            var expr = ts.getExternalModuleName(node);
+            var expr = ts.getExternalModuleName(node); // TODO: GH#18217
             var baseName = ts.isStringLiteral(expr) ?
                 ts.makeIdentifierFromModuleName(expr.text) : "module";
             return makeUniqueName(baseName);
         }
+        /**
+         * Generates a unique name for a default export.
+         */
         function generateNameForExportDefault() {
             return makeUniqueName("default");
         }
+        /**
+         * Generates a unique name for a class expression.
+         */
         function generateNameForClassExpression() {
             return makeUniqueName("class");
         }
@@ -64357,74 +80187,87 @@ var ts;
             if (ts.isIdentifier(node.name)) {
                 return generateNameCached(node.name);
             }
-            return makeTempVariableName(0);
+            return makeTempVariableName(0 /* Auto */);
         }
+        /**
+         * Generates a unique name from a node.
+         */
         function generateNameForNode(node, flags) {
             switch (node.kind) {
-                case 71:
-                    return makeUniqueName(getTextOfNode(node), isUniqueName, !!(flags & 16), !!(flags & 8));
-                case 239:
-                case 238:
+                case 71 /* Identifier */:
+                    return makeUniqueName(getTextOfNode(node), isUniqueName, !!(flags & 16 /* Optimistic */), !!(flags & 8 /* ReservedInNestedScopes */));
+                case 239 /* ModuleDeclaration */:
+                case 238 /* EnumDeclaration */:
                     return generateNameForModuleOrEnum(node);
-                case 244:
-                case 250:
+                case 244 /* ImportDeclaration */:
+                case 250 /* ExportDeclaration */:
                     return generateNameForImportOrExportDeclaration(node);
-                case 234:
-                case 235:
-                case 249:
+                case 234 /* FunctionDeclaration */:
+                case 235 /* ClassDeclaration */:
+                case 249 /* ExportAssignment */:
                     return generateNameForExportDefault();
-                case 205:
+                case 205 /* ClassExpression */:
                     return generateNameForClassExpression();
-                case 154:
-                case 156:
-                case 157:
+                case 154 /* MethodDeclaration */:
+                case 156 /* GetAccessor */:
+                case 157 /* SetAccessor */:
                     return generateNameForMethodOrAccessor(node);
                 default:
-                    return makeTempVariableName(0);
+                    return makeTempVariableName(0 /* Auto */);
             }
         }
+        /**
+         * Generates a unique identifier for a node.
+         */
         function makeName(name) {
-            switch (name.autoGenerateFlags & 7) {
-                case 1:
-                    return makeTempVariableName(0, !!(name.autoGenerateFlags & 8));
-                case 2:
-                    return makeTempVariableName(268435456, !!(name.autoGenerateFlags & 8));
-                case 3:
-                    return makeUniqueName(ts.idText(name), (name.autoGenerateFlags & 32) ? isFileLevelUniqueName : isUniqueName, !!(name.autoGenerateFlags & 16), !!(name.autoGenerateFlags & 8));
+            switch (name.autoGenerateFlags & 7 /* KindMask */) {
+                case 1 /* Auto */:
+                    return makeTempVariableName(0 /* Auto */, !!(name.autoGenerateFlags & 8 /* ReservedInNestedScopes */));
+                case 2 /* Loop */:
+                    return makeTempVariableName(268435456 /* _i */, !!(name.autoGenerateFlags & 8 /* ReservedInNestedScopes */));
+                case 3 /* Unique */:
+                    return makeUniqueName(ts.idText(name), (name.autoGenerateFlags & 32 /* FileLevel */) ? isFileLevelUniqueName : isUniqueName, !!(name.autoGenerateFlags & 16 /* Optimistic */), !!(name.autoGenerateFlags & 8 /* ReservedInNestedScopes */));
             }
             return ts.Debug.fail("Unsupported GeneratedIdentifierKind.");
         }
+        /**
+         * Gets the node from which a name should be generated.
+         */
         function getNodeForGeneratedName(name) {
             var autoGenerateId = name.autoGenerateId;
             var node = name;
             var original = node.original;
             while (original) {
                 node = original;
+                // if "node" is a different generated name (having a different
+                // "autoGenerateId"), use it and stop traversing.
                 if (ts.isIdentifier(node)
-                    && !!(node.autoGenerateFlags & 4)
+                    && !!(node.autoGenerateFlags & 4 /* Node */)
                     && node.autoGenerateId !== autoGenerateId) {
                     break;
                 }
                 original = node.original;
             }
+            // otherwise, return the original node for the source;
             return node;
         }
     }
     ts.createPrinter = createPrinter;
     function createBracketsMap() {
         var brackets = [];
-        brackets[512] = ["{", "}"];
-        brackets[1024] = ["(", ")"];
-        brackets[2048] = ["<", ">"];
-        brackets[4096] = ["[", "]"];
+        brackets[512 /* Braces */] = ["{", "}"];
+        brackets[1024 /* Parenthesis */] = ["(", ")"];
+        brackets[2048 /* AngleBrackets */] = ["<", ">"];
+        brackets[4096 /* SquareBrackets */] = ["[", "]"];
         return brackets;
     }
     function getOpeningBracket(format) {
-        return brackets[format & 7680][0];
+        return brackets[format & 7680 /* BracketsMask */][0];
     }
     function getClosingBracket(format) {
-        return brackets[format & 7680][1];
+        return brackets[format & 7680 /* BracketsMask */][1];
     }
+    // Flags enum to track count of temp variables and a few dedicated names
     var TempFlags;
     (function (TempFlags) {
         TempFlags[TempFlags["Auto"] = 0] = "Auto";
@@ -64432,6 +80275,7 @@ var ts;
         TempFlags[TempFlags["_i"] = 268435456] = "_i";
     })(TempFlags || (TempFlags = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     function createCachedDirectoryStructureHost(host, currentDirectory, useCaseSensitiveFileNames) {
@@ -64467,12 +80311,17 @@ var ts;
         }
         function createCachedFileSystemEntries(rootDir, rootDirPath) {
             var resultFromHost = {
-                files: ts.map(host.readDirectory(rootDir, undefined, undefined, ["*.*"]), getBaseNameOfFileName) || [],
+                files: ts.map(host.readDirectory(rootDir, /*extensions*/ undefined, /*exclude*/ undefined, /*include*/ ["*.*"]), getBaseNameOfFileName) || [],
                 directories: host.getDirectories(rootDir) || []
             };
             cachedReadDirectoryResult.set(ts.ensureTrailingDirectorySeparator(rootDirPath), resultFromHost);
             return resultFromHost;
         }
+        /**
+         * If the readDirectory result was already cached, it returns that
+         * Otherwise gets result from host and caches it.
+         * The host request is done under try catch block to avoid caching incorrect result
+         */
         function tryReadDirectory(rootDir, rootDirPath) {
             rootDirPath = ts.ensureTrailingDirectorySeparator(rootDirPath);
             var cachedResult = getCachedFileSystemEntries(rootDirPath);
@@ -64483,6 +80332,7 @@ var ts;
                 return createCachedFileSystemEntries(rootDir, rootDirPath);
             }
             catch (_e) {
+                // If there is exception to read directories, dont cache the result and direct the calls to host
                 ts.Debug.assert(!cachedReadDirectoryResult.has(ts.ensureTrailingDirectorySeparator(rootDirPath)));
                 return undefined;
             }
@@ -64507,7 +80357,7 @@ var ts;
             var path = toPath(fileName);
             var result = getCachedFileSystemEntriesForBaseDir(path);
             if (result) {
-                updateFilesOfFileSystemEntry(result, getBaseNameOfFileName(fileName), true);
+                updateFilesOfFileSystemEntry(result, getBaseNameOfFileName(fileName), /*fileExists*/ true);
             }
             return host.writeFile(fileName, data, writeByteOrderMark);
         }
@@ -64526,7 +80376,7 @@ var ts;
             var result = getCachedFileSystemEntriesForBaseDir(path);
             var baseFileName = getBaseNameOfFileName(dirPath);
             if (result) {
-                updateFileSystemEntry(result.directories, baseFileName, true);
+                updateFileSystemEntry(result.directories, baseFileName, /*isValid*/ true);
             }
             host.createDirectory(dirPath);
         }
@@ -64556,6 +80406,8 @@ var ts;
         function addOrDeleteFileOrDirectory(fileOrDirectory, fileOrDirectoryPath) {
             var existingResult = getCachedFileSystemEntries(fileOrDirectoryPath);
             if (existingResult) {
+                // Just clear the cache for now
+                // For now just clear the cache, since this could mean that multiple level entries might need to be re-evaluated
                 clearCache();
                 return undefined;
             }
@@ -64563,7 +80415,10 @@ var ts;
             if (!parentResult) {
                 return undefined;
             }
+            // This was earlier a file (hence not in cached directory contents)
+            // or we never cached the directory containing it
             if (!host.directoryExists) {
+                // Since host doesnt support directory exists, clear the cache as otherwise it might not be same
                 clearCache();
                 return undefined;
             }
@@ -64573,9 +80428,11 @@ var ts;
                 directoryExists: host.directoryExists(fileOrDirectoryPath)
             };
             if (fsQueryResult.directoryExists || hasEntry(parentResult.directories, baseName)) {
+                // Folder added or removed, clear the cache instead of updating the folder and its structure
                 clearCache();
             }
             else {
+                // No need to update the directory structure, just files
                 updateFilesOfFileSystemEntry(parentResult, baseName, fsQueryResult.fileExists);
             }
             return fsQueryResult;
@@ -64600,31 +80457,51 @@ var ts;
     var ConfigFileProgramReloadLevel;
     (function (ConfigFileProgramReloadLevel) {
         ConfigFileProgramReloadLevel[ConfigFileProgramReloadLevel["None"] = 0] = "None";
+        /** Update the file name list from the disk */
         ConfigFileProgramReloadLevel[ConfigFileProgramReloadLevel["Partial"] = 1] = "Partial";
+        /** Reload completely by re-reading contents of config file from disk and updating program */
         ConfigFileProgramReloadLevel[ConfigFileProgramReloadLevel["Full"] = 2] = "Full";
     })(ConfigFileProgramReloadLevel = ts.ConfigFileProgramReloadLevel || (ts.ConfigFileProgramReloadLevel = {}));
+    /**
+     * Updates the existing missing file watches with the new set of missing files after new program is created
+     */
     function updateMissingFilePathsWatch(program, missingFileWatches, createMissingFileWatch) {
         var missingFilePaths = program.getMissingFilePaths();
         var newMissingFilePathMap = ts.arrayToSet(missingFilePaths);
+        // Update the missing file paths watcher
         ts.mutateMap(missingFileWatches, newMissingFilePathMap, {
+            // Watch the missing files
             createNewValue: createMissingFileWatch,
+            // Files that are no longer missing (e.g. because they are no longer required)
+            // should no longer be watched.
             onDeleteValue: ts.closeFileWatcher
         });
     }
     ts.updateMissingFilePathsWatch = updateMissingFilePathsWatch;
+    /**
+     * Updates the existing wild card directory watches with the new set of wild card directories from the config file
+     * after new program is created because the config file was reloaded or program was created first time from the config file
+     * Note that there is no need to call this function when the program is updated with additional files without reloading config files,
+     * as wildcard directories wont change unless reloading config file
+     */
     function updateWatchingWildcardDirectories(existingWatchedForWildcards, wildcardDirectories, watchDirectory) {
         ts.mutateMap(existingWatchedForWildcards, wildcardDirectories, {
+            // Create new watch and recursive info
             createNewValue: createWildcardDirectoryWatcher,
+            // Close existing watch thats not needed any more
             onDeleteValue: closeFileWatcherOf,
+            // Close existing watch that doesnt match in the flags
             onExistingValue: updateWildcardDirectoryWatcher
         });
         function createWildcardDirectoryWatcher(directory, flags) {
+            // Create new watch and recursive info
             return {
                 watcher: watchDirectory(directory, flags),
                 flags: flags
             };
         }
         function updateWildcardDirectoryWatcher(existingWatcher, flags, directory) {
+            // Watcher needs to be updated if the recursive flags dont match
             if (existingWatcher.flags === flags) {
                 return;
             }
@@ -64656,13 +80533,13 @@ var ts;
         var createDirectoryWatcher = getCreateFileWatcher(watchLogLevel, watchDirectory);
         return {
             watchFile: function (host, file, callback, pollingInterval, detailInfo1, detailInfo2) {
-                return createFileWatcher(host, file, callback, pollingInterval, undefined, detailInfo1, detailInfo2, watchFile, log, "FileWatcher", getDetailWatchInfo);
+                return createFileWatcher(host, file, callback, pollingInterval, /*passThrough*/ undefined, detailInfo1, detailInfo2, watchFile, log, "FileWatcher", getDetailWatchInfo);
             },
             watchFilePath: function (host, file, callback, pollingInterval, path, detailInfo1, detailInfo2) {
                 return createFilePathWatcher(host, file, callback, pollingInterval, path, detailInfo1, detailInfo2, watchFile, log, "FileWatcher", getDetailWatchInfo);
             },
             watchDirectory: function (host, directory, callback, flags, detailInfo1, detailInfo2) {
-                return createDirectoryWatcher(host, directory, callback, flags, undefined, detailInfo1, detailInfo2, watchDirectory, log, "DirectoryWatcher", getDetailWatchInfo);
+                return createDirectoryWatcher(host, directory, callback, flags, /*passThrough*/ undefined, detailInfo1, detailInfo2, watchDirectory, log, "DirectoryWatcher", getDetailWatchInfo);
             }
         };
         function watchFilePath(host, file, callback, pollingInterval, path) {
@@ -64673,7 +80550,7 @@ var ts;
         return host.watchFile(file, callback, pollingInterval);
     }
     function watchDirectory(host, directory, callback, flags) {
-        return host.watchDirectory(directory, callback, (flags & 1) !== 0);
+        return host.watchDirectory(directory, callback, (flags & 1 /* Recursive */) !== 0);
     }
     function getCreateFileWatcher(watchLogLevel, addWatch) {
         switch (watchLogLevel) {
@@ -64730,12 +80607,15 @@ var ts;
         return ts.normalizePath(referencedFileName);
     }
     ts.resolveTripleslashReference = resolveTripleslashReference;
+    /* @internal */
     function computeCommonSourceDirectoryOfFilenames(fileNames, currentDirectory, getCanonicalFileName) {
         var commonPathComponents;
         var failed = ts.forEach(fileNames, function (sourceFile) {
+            // Each file contributes into common source file path
             var sourcePathComponents = ts.getNormalizedPathComponents(sourceFile, currentDirectory);
-            sourcePathComponents.pop();
+            sourcePathComponents.pop(); // The base file name is not part of the common directory path
             if (!commonPathComponents) {
+                // first file
                 commonPathComponents = sourcePathComponents;
                 return;
             }
@@ -64743,20 +80623,24 @@ var ts;
             for (var i = 0; i < n; i++) {
                 if (getCanonicalFileName(commonPathComponents[i]) !== getCanonicalFileName(sourcePathComponents[i])) {
                     if (i === 0) {
+                        // Failed to find any common path component
                         return true;
                     }
+                    // New common path found that is 0 -> i-1
                     commonPathComponents.length = i;
                     break;
                 }
             }
+            // If the sourcePathComponents was shorter than the commonPathComponents, truncate to the sourcePathComponents
             if (sourcePathComponents.length < commonPathComponents.length) {
                 commonPathComponents.length = sourcePathComponents.length;
             }
         });
+        // A common path can not be found when paths span multiple drives on windows, for example
         if (failed) {
             return "";
         }
-        if (!commonPathComponents) {
+        if (!commonPathComponents) { // Can happen when all input files are .d.ts files
             return currentDirectory;
         }
         return ts.getPathFromPathComponents(commonPathComponents);
@@ -64765,6 +80649,8 @@ var ts;
     function createCompilerHost(options, setParentNodes) {
         var existingDirectories = ts.createMap();
         function getCanonicalFileName(fileName) {
+            // if underlying system can distinguish between two files whose names differs only in cases then file name already in canonical form.
+            // otherwise use toLowerCase as a canonical form.
             return ts.sys.useCaseSensitiveFileNames ? fileName : fileName.toLowerCase();
         }
         function getSourceFile(fileName, languageVersion, onError) {
@@ -64805,10 +80691,11 @@ var ts;
             if (!outputFingerprints) {
                 outputFingerprints = ts.createMap();
             }
-            var hash = ts.sys.createHash(data);
-            var mtimeBefore = ts.sys.getModifiedTime(fileName);
+            var hash = ts.sys.createHash(data); // TODO: GH#18217
+            var mtimeBefore = ts.sys.getModifiedTime(fileName); // TODO: GH#18217
             if (mtimeBefore) {
                 var fingerprint = outputFingerprints.get(fileName);
+                // If output has not been changed, and the file has no external modification
                 if (fingerprint &&
                     fingerprint.byteOrderMark === writeByteOrderMark &&
                     fingerprint.hash === hash &&
@@ -64817,7 +80704,7 @@ var ts;
                 }
             }
             ts.sys.writeFile(fileName, data, writeByteOrderMark);
-            var mtimeAfter = ts.sys.getModifiedTime(fileName);
+            var mtimeAfter = ts.sys.getModifiedTime(fileName); // TODO: GH#18217
             outputFingerprints.set(fileName, {
                 hash: hash,
                 byteOrderMark: writeByteOrderMark,
@@ -64864,7 +80751,10 @@ var ts;
             getEnvironmentVariable: function (name) { return ts.sys.getEnvironmentVariable ? ts.sys.getEnvironmentVariable(name) : ""; },
             getDirectories: function (path) { return ts.sys.getDirectories(path); },
             realpath: realpath,
-            readDirectory: function (path, extensions, include, exclude, depth) { return ts.sys.readDirectory(path, extensions, include, exclude, depth); }
+            readDirectory: function (path, extensions, include, exclude, depth) { return ts.sys.readDirectory(path, extensions, include, exclude, depth); },
+            getModifiedTime: ts.sys.getModifiedTime && (function (path) { return ts.sys.getModifiedTime(path); }),
+            setModifiedTime: ts.sys.setModifiedTime && (function (path, date) { return ts.sys.setModifiedTime(path, date); }),
+            deleteFile: ts.sys.deleteFile && (function (path) { return ts.sys.deleteFile(path); })
         };
     }
     ts.createCompilerHost = createCompilerHost;
@@ -64888,7 +80778,7 @@ var ts;
     function formatDiagnostic(diagnostic, host) {
         var errorMessage = ts.diagnosticCategoryName(diagnostic) + " TS" + diagnostic.code + ": " + flattenDiagnosticMessageText(diagnostic.messageText, host.getNewLine()) + host.getNewLine();
         if (diagnostic.file) {
-            var _a = ts.getLineAndCharacterOfPosition(diagnostic.file, diagnostic.start), line = _a.line, character = _a.character;
+            var _a = ts.getLineAndCharacterOfPosition(diagnostic.file, diagnostic.start), line = _a.line, character = _a.character; // TODO: GH#18217
             var fileName = diagnostic.file.fileName;
             var relativeFileName = ts.convertToRelativePath(fileName, host.getCurrentDirectory(), function (fileName) { return host.getCanonicalFileName(fileName); });
             return relativeFileName + "(" + (line + 1) + "," + (character + 1) + "): " + errorMessage;
@@ -64896,6 +80786,7 @@ var ts;
         return errorMessage;
     }
     ts.formatDiagnostic = formatDiagnostic;
+    /** @internal */
     var ForegroundColorEscapeSequences;
     (function (ForegroundColorEscapeSequences) {
         ForegroundColorEscapeSequences["Grey"] = "\u001B[90m";
@@ -64916,6 +80807,7 @@ var ts;
             case ts.DiagnosticCategory.Message: return ForegroundColorEscapeSequences.Blue;
         }
     }
+    /** @internal */
     function formatColorAndReset(text, formatStyle) {
         return formatStyle + text + resetEscapeSequence;
     }
@@ -64933,7 +80825,7 @@ var ts;
             var context = "";
             if (diagnostic.file) {
                 var start = diagnostic.start, length_4 = diagnostic.length, file = diagnostic.file;
-                var _a = ts.getLineAndCharacterOfPosition(file, start), firstLine = _a.line, firstLineChar = _a.character;
+                var _a = ts.getLineAndCharacterOfPosition(file, start), firstLine = _a.line, firstLineChar = _a.character; // TODO: GH#18217
                 var _b = ts.getLineAndCharacterOfPosition(file, start + length_4), lastLine = _b.line, lastLineChar = _b.character;
                 var lastLineInFile = ts.getLineAndCharacterOfPosition(file, file.text.length).line;
                 var relativeFileName = host ? ts.convertToRelativePath(file.fileName, host.getCurrentDirectory(), function (fileName) { return host.getCanonicalFileName(fileName); }) : file.fileName;
@@ -64944,6 +80836,8 @@ var ts;
                 }
                 for (var i = firstLine; i <= lastLine; i++) {
                     context += host.getNewLine();
+                    // If the error spans over 5 lines, we'll only show the first 2 and last 2 lines,
+                    // so we'll skip ahead to the second-to-last line.
                     if (hasMoreThanFiveLines && firstLine + 1 < i && i < lastLine - 1) {
                         context += formatColorAndReset(padLeft(ellipsis, gutterWidth), gutterStyleSequence) + gutterSeparator + host.getNewLine();
                         i = lastLine - 1;
@@ -64951,13 +80845,17 @@ var ts;
                     var lineStart = ts.getPositionOfLineAndCharacter(file, i, 0);
                     var lineEnd = i < lastLineInFile ? ts.getPositionOfLineAndCharacter(file, i + 1, 0) : file.text.length;
                     var lineContent = file.text.slice(lineStart, lineEnd);
-                    lineContent = lineContent.replace(/\s+$/g, "");
-                    lineContent = lineContent.replace("\t", " ");
+                    lineContent = lineContent.replace(/\s+$/g, ""); // trim from end
+                    lineContent = lineContent.replace("\t", " "); // convert tabs to single spaces
+                    // Output the gutter and the actual contents of the line.
                     context += formatColorAndReset(padLeft(i + 1 + "", gutterWidth), gutterStyleSequence) + gutterSeparator;
                     context += lineContent + host.getNewLine();
+                    // Output the gutter and the error span for the line using tildes.
                     context += formatColorAndReset(padLeft("", gutterWidth), gutterStyleSequence) + gutterSeparator;
                     context += ForegroundColorEscapeSequences.Red;
                     if (i === firstLine) {
+                        // If we're on the last line, then limit it to the last character of the last line.
+                        // Otherwise, we'll just squiggle the rest of the line, giving 'slice' no end position.
                         var lastCharForLine = i === lastLine ? lastLineChar : undefined;
                         context += lineContent.slice(0, firstLineChar).replace(/\S/g, " ");
                         context += lineContent.slice(firstLineChar, lastCharForLine).replace(/./g, "~");
@@ -64966,6 +80864,7 @@ var ts;
                         context += lineContent.slice(0, lastLineChar).replace(/./g, "~");
                     }
                     else {
+                        // Squiggle the entire line.
                         context += lineContent.replace(/./g, "~");
                     }
                     context += resetEscapeSequence;
@@ -64986,7 +80885,7 @@ var ts;
             }
             output += host.getNewLine();
         }
-        return output + host.getNewLine();
+        return output;
     }
     ts.formatDiagnosticsWithColorAndContext = formatDiagnosticsWithColorAndContext;
     function flattenDiagnosticMessageText(messageText, newLine) {
@@ -65031,23 +80930,34 @@ var ts;
         }
         return resolutions;
     }
+    /**
+     * Determines if program structure is upto date or needs to be recreated
+     */
+    /* @internal */
     function isProgramUptoDate(program, rootFileNames, newOptions, getSourceVersion, fileExists, hasInvalidatedResolution, hasChangedAutomaticTypeDirectiveNames) {
+        // If we haven't created a program yet or have changed automatic type directives, then it is not up-to-date
         if (!program || hasChangedAutomaticTypeDirectiveNames) {
             return false;
         }
+        // If number of files in the program do not match, it is not up-to-date
         if (program.getRootFileNames().length !== rootFileNames.length) {
             return false;
         }
+        // If any file is not up-to-date, then the whole program is not up-to-date
         if (program.getSourceFiles().some(sourceFileNotUptoDate)) {
             return false;
         }
+        // If any of the missing file paths are now created
         if (program.getMissingFilePaths().some(fileExists)) {
             return false;
         }
         var currentOptions = program.getCompilerOptions();
+        // If the compilation settings do no match, then the program is not up-to-date
         if (!ts.compareDataObjects(currentOptions, newOptions)) {
             return false;
         }
+        // If everything matches but the text of config file is changed,
+        // error locations can change for program options, so update the program
         if (currentOptions.configFile && newOptions.configFile) {
             return currentOptions.configFile.text === newOptions.configFile.text;
         }
@@ -65063,7 +80973,12 @@ var ts;
             configFileParseResult.errors;
     }
     ts.getConfigFileParsingDiagnostics = getConfigFileParsingDiagnostics;
+    /**
+     * Determined if source file needs to be re-created even if its text hasn't changed
+     */
     function shouldProgramCreateNewSourceFiles(program, newOptions) {
+        // If any of these options change, we can't reuse old source file even if version match
+        // The change in options like these could result in change in syntax tree change
         var oldOptions = program && program.getCompilerOptions();
         return oldOptions && (oldOptions.target !== newOptions.target ||
             oldOptions.module !== newOptions.module ||
@@ -65085,11 +81000,13 @@ var ts;
         };
     }
     function createProgram(rootNamesOrOptions, _options, _host, _oldProgram, _configFileParsingDiagnostics) {
-        var createProgramOptions = ts.isArray(rootNamesOrOptions) ? createCreateProgramOptions(rootNamesOrOptions, _options, _host, _oldProgram, _configFileParsingDiagnostics) : rootNamesOrOptions;
+        var createProgramOptions = ts.isArray(rootNamesOrOptions) ? createCreateProgramOptions(rootNamesOrOptions, _options, _host, _oldProgram, _configFileParsingDiagnostics) : rootNamesOrOptions; // TODO: GH#18217
         var rootNames = createProgramOptions.rootNames, options = createProgramOptions.options, configFileParsingDiagnostics = createProgramOptions.configFileParsingDiagnostics, projectReferences = createProgramOptions.projectReferences;
         var oldProgram = createProgramOptions.oldProgram;
         var program;
-        var files = [];
+        var processingDefaultLibFiles;
+        var processingOtherFiles;
+        var files;
         var commonSourceDirectory;
         var diagnosticsProducingTypeChecker;
         var noDiagnosticsTypeChecker;
@@ -65099,9 +81016,19 @@ var ts;
         var cachedDeclarationDiagnosticsForFile = {};
         var resolvedTypeReferenceDirectives = ts.createMap();
         var fileProcessingDiagnostics = ts.createDiagnosticCollection();
+        // The below settings are to track if a .js file should be add to the program if loaded via searching under node_modules.
+        // This works as imported modules are discovered recursively in a depth first manner, specifically:
+        // - For each root file, findSourceFile is called.
+        // - This calls processImportedModules for each module imported in the source file.
+        // - This calls resolveModuleNames, and then calls findSourceFile for each resolved module.
+        // As all these operations happen - and are nested - within the createProgram call, they close over the below variables.
+        // The current resolution depth is tracked by incrementing/decrementing as the depth first search progresses.
         var maxNodeModuleJsDepth = typeof options.maxNodeModuleJsDepth === "number" ? options.maxNodeModuleJsDepth : 0;
         var currentNodeModulesDepth = 0;
+        // If a module has some of its imports skipped due to being at the depth limit under node_modules, then track
+        // this, as it may be imported at a shallower depth later, and then it will need its skipped imports processed.
         var modulesWithElidedImports = ts.createMap();
+        // Track source files that are source files found by searching under node_modules, as these shouldn't be compiled.
         var sourceFilesFoundSearchingNodeModules = ts.createMap();
         ts.performance.mark("beforeProgram");
         var host = createProgramOptions.host || createCompilerHost(options);
@@ -65112,6 +81039,7 @@ var ts;
         var programDiagnostics = ts.createDiagnosticCollection();
         var currentDirectory = host.getCurrentDirectory();
         var supportedExtensions = ts.getSupportedExtensions(options);
+        // Map storing if there is emit blocking diagnostics for given input
         var hasEmitBlockingDiagnostics = ts.createMap();
         var _compilerOptionsObjectLiteralSyntax;
         var _referencesArrayLiteralSyntax;
@@ -65120,6 +81048,7 @@ var ts;
         var hasInvalidatedResolution = host.hasInvalidatedResolution || ts.returnFalse;
         if (host.resolveModuleNames) {
             resolveModuleNamesWorker = function (moduleNames, containingFile, reusedNames) { return host.resolveModuleNames(ts.Debug.assertEachDefined(moduleNames), containingFile, reusedNames).map(function (resolved) {
+                // An older host may have omitted extension, in which case we should infer it from the file extension of resolvedFileName.
                 if (!resolved || resolved.extension !== undefined) {
                     return resolved;
                 }
@@ -65130,7 +81059,7 @@ var ts;
         }
         else {
             moduleResolutionCache = ts.createModuleResolutionCache(currentDirectory, function (x) { return host.getCanonicalFileName(x); });
-            var loader_1 = function (moduleName, containingFile) { return ts.resolveModuleName(moduleName, containingFile, options, host, moduleResolutionCache).resolvedModule; };
+            var loader_1 = function (moduleName, containingFile) { return ts.resolveModuleName(moduleName, containingFile, options, host, moduleResolutionCache).resolvedModule; }; // TODO: GH#18217
             resolveModuleNamesWorker = function (moduleNames, containingFile) { return loadWithLocalCache(ts.Debug.assertEachDefined(moduleNames), containingFile, loader_1); };
         }
         var resolveTypeReferenceDirectiveNamesWorker;
@@ -65138,37 +81067,48 @@ var ts;
             resolveTypeReferenceDirectiveNamesWorker = function (typeDirectiveNames, containingFile) { return host.resolveTypeReferenceDirectives(ts.Debug.assertEachDefined(typeDirectiveNames), containingFile); };
         }
         else {
-            var loader_2 = function (typesRef, containingFile) { return ts.resolveTypeReferenceDirective(typesRef, containingFile, options, host).resolvedTypeReferenceDirective; };
+            var loader_2 = function (typesRef, containingFile) { return ts.resolveTypeReferenceDirective(typesRef, containingFile, options, host).resolvedTypeReferenceDirective; }; // TODO: GH#18217
             resolveTypeReferenceDirectiveNamesWorker = function (typeReferenceDirectiveNames, containingFile) { return loadWithLocalCache(ts.Debug.assertEachDefined(typeReferenceDirectiveNames), containingFile, loader_2); };
         }
+        // Map from a stringified PackageId to the source file with that id.
+        // Only one source file may have a given packageId. Others become redirects (see createRedirectSourceFile).
+        // `packageIdToSourceFile` is only used while building the program, while `sourceFileToPackageName` and `isSourceFileTargetOfRedirect` are kept around.
         var packageIdToSourceFile = ts.createMap();
+        // Maps from a SourceFile's `.path` to the name of the package it was imported with.
         var sourceFileToPackageName = ts.createMap();
         var redirectTargetsSet = ts.createMap();
         var filesByName = ts.createMap();
         var missingFilePaths;
+        // stores 'filename -> file association' ignoring case
+        // used to track cases when two file names differ only in casing
         var filesByNameIgnoreCase = host.useCaseSensitiveFileNames() ? ts.createMap() : undefined;
+        // A parallel array to projectReferences storing the results of reading in the referenced tsconfig files
         var resolvedProjectReferences = projectReferences ? [] : undefined;
         var projectReferenceRedirects = ts.createMap();
-        if (projectReferences) {
-            for (var _i = 0, projectReferences_1 = projectReferences; _i < projectReferences_1.length; _i++) {
-                var ref = projectReferences_1[_i];
-                var parsedRef = parseProjectReferenceConfigFile(ref);
-                resolvedProjectReferences.push(parsedRef);
-                if (parsedRef) {
-                    if (parsedRef.commandLine.options.outFile) {
-                        var dtsOutfile = ts.changeExtension(parsedRef.commandLine.options.outFile, ".d.ts");
-                        processSourceFile(dtsOutfile, false, undefined);
-                    }
-                    addProjectReferenceRedirects(parsedRef.commandLine, projectReferenceRedirects);
-                }
-            }
-        }
         var shouldCreateNewSourceFile = shouldProgramCreateNewSourceFiles(oldProgram, options);
         var structuralIsReused = tryReuseStructureFromOldProgram();
-        if (structuralIsReused !== 2) {
-            ts.forEach(rootNames, function (name) { return processRootFile(name, false); });
+        if (structuralIsReused !== 2 /* Completely */) {
+            processingDefaultLibFiles = [];
+            processingOtherFiles = [];
+            if (projectReferences) {
+                for (var _i = 0, projectReferences_1 = projectReferences; _i < projectReferences_1.length; _i++) {
+                    var ref = projectReferences_1[_i];
+                    var parsedRef = parseProjectReferenceConfigFile(ref);
+                    resolvedProjectReferences.push(parsedRef);
+                    if (parsedRef) {
+                        if (parsedRef.commandLine.options.outFile) {
+                            var dtsOutfile = ts.changeExtension(parsedRef.commandLine.options.outFile, ".d.ts");
+                            processSourceFile(dtsOutfile, /*isDefaultLib*/ false, /*ignoreNoDefaultLib*/ false, /*packageId*/ undefined);
+                        }
+                        addProjectReferenceRedirects(parsedRef.commandLine, projectReferenceRedirects);
+                    }
+                }
+            }
+            ts.forEach(rootNames, function (name) { return processRootFile(name, /*isDefaultLib*/ false, /*ignoreNoDefaultLib*/ false); });
+            // load type declarations specified via 'types' argument or implicitly from types/ and node_modules/@types folders
             var typeReferences = ts.getAutomaticTypeDirectiveNames(options, host);
             if (typeReferences.length) {
+                // This containingFilename needs to match with the one used in managed-side
                 var containingDirectory = options.configFilePath ? ts.getDirectoryPath(options.configFilePath) : host.getCurrentDirectory();
                 var containingFilename = ts.combinePaths(containingDirectory, "__inferred type names__.ts");
                 var resolutions = resolveTypeReferenceDirectiveNamesWorker(typeReferences, containingFilename);
@@ -65176,20 +81116,31 @@ var ts;
                     processTypeReferenceDirective(typeReferences[i], resolutions[i]);
                 }
             }
+            // Do not process the default library if:
+            //  - The '--noLib' flag is used.
+            //  - A 'no-default-lib' reference comment is encountered in
+            //      processing the root files.
             if (!skipDefaultLib) {
+                // If '--lib' is not specified, include default library file according to '--target'
+                // otherwise, using options specified in '--lib' instead of '--target' default library file
                 var defaultLibraryFileName = getDefaultLibraryFileName();
                 if (!options.lib && defaultLibraryFileName) {
-                    processRootFile(defaultLibraryFileName, true);
+                    processRootFile(defaultLibraryFileName, /*isDefaultLib*/ true, /*ignoreNoDefaultLib*/ false);
                 }
                 else {
                     ts.forEach(options.lib, function (libFileName) {
-                        processRootFile(ts.combinePaths(defaultLibraryPath, libFileName), true);
+                        processRootFile(ts.combinePaths(defaultLibraryPath, libFileName), /*isDefaultLib*/ true, /*ignoreNoDefaultLib*/ false);
                     });
                 }
             }
             missingFilePaths = ts.arrayFrom(filesByName.keys(), function (p) { return p; }).filter(function (p) { return !filesByName.get(p); });
+            files = ts.stableSort(processingDefaultLibFiles, compareDefaultLibFiles).concat(processingOtherFiles);
+            processingDefaultLibFiles = undefined;
+            processingOtherFiles = undefined;
         }
         ts.Debug.assert(!!missingFilePaths);
+        // Release any files we have acquired in the old program but are
+        // not part of the new program.
         if (oldProgram && host.onReleaseOldSourceFile) {
             var oldSourceFiles = oldProgram.getSourceFiles();
             for (var _a = 0, oldSourceFiles_1 = oldSourceFiles; _a < oldSourceFiles_1.length; _a++) {
@@ -65199,6 +81150,7 @@ var ts;
                 }
             }
         }
+        // unconditionally set oldProgram to undefined to prevent it from being captured in closure
         oldProgram = undefined;
         program = {
             getRootFileNames: function () { return rootNames; },
@@ -65229,6 +81181,7 @@ var ts;
             isSourceFileDefaultLibrary: isSourceFileDefaultLibrary,
             dropDiagnosticsProducingTypeChecker: dropDiagnosticsProducingTypeChecker,
             getSourceFileFromReference: getSourceFileFromReference,
+            getLibFileFromReference: getLibFileFromReference,
             sourceFileToPackageName: sourceFileToPackageName,
             redirectTargetsSet: redirectTargetsSet,
             isEmittedFile: isEmittedFile,
@@ -65240,6 +81193,21 @@ var ts;
         ts.performance.mark("afterProgram");
         ts.performance.measure("Program", "beforeProgram", "afterProgram");
         return program;
+        function compareDefaultLibFiles(a, b) {
+            return ts.compareValues(getDefaultLibFilePriority(a), getDefaultLibFilePriority(b));
+        }
+        function getDefaultLibFilePriority(a) {
+            if (ts.containsPath(defaultLibraryPath, a.fileName, /*ignoreCase*/ false)) {
+                var basename = ts.getBaseFileName(a.fileName);
+                if (basename === "lib.d.ts" || basename === "lib.es6.d.ts")
+                    return 0;
+                var name = ts.removeSuffix(ts.removePrefix(basename, "lib."), ".d.ts");
+                var index = ts.libs.indexOf(name);
+                if (index !== -1)
+                    return index + 1;
+            }
+            return ts.libs.length + 2;
+        }
         function getResolvedModuleWithFailedLookupLocationsFromCache(moduleName, containingFile) {
             return moduleResolutionCache && ts.resolveModuleNameFromCache(moduleName, containingFile, moduleResolutionCache);
         }
@@ -65250,16 +81218,21 @@ var ts;
             if (commonSourceDirectory === undefined) {
                 var emittedFiles = ts.filter(files, function (file) { return ts.sourceFileMayBeEmitted(file, options, isSourceFileFromExternalLibrary); });
                 if (options.rootDir && checkSourceFilesBelongToPath(emittedFiles, options.rootDir)) {
+                    // If a rootDir is specified use it as the commonSourceDirectory
                     commonSourceDirectory = ts.getNormalizedAbsolutePath(options.rootDir, currentDirectory);
                 }
                 else if (options.composite) {
-                    commonSourceDirectory = ts.getDirectoryPath(ts.normalizeSlashes(options.configFilePath));
+                    // Project compilations never infer their root from the input source paths
+                    commonSourceDirectory = ts.getDirectoryPath(ts.normalizeSlashes(options.configFilePath)); // TODO: GH#18217
                     checkSourceFilesBelongToPath(emittedFiles, commonSourceDirectory);
                 }
                 else {
                     commonSourceDirectory = computeCommonSourceDirectory(emittedFiles);
                 }
                 if (commonSourceDirectory && commonSourceDirectory[commonSourceDirectory.length - 1] !== ts.directorySeparator) {
+                    // Make sure directory path ends with directory separator so this string can directly
+                    // used to replace with "" to get the relative path of the source file and the relative path doesn't
+                    // start with / making it rooted path
                     commonSourceDirectory += ts.directorySeparator;
                 }
             }
@@ -65267,6 +81240,7 @@ var ts;
         }
         function getClassifiableNames() {
             if (!classifiableNames) {
+                // Initialize a checker so that all our files are bound.
                 getTypeChecker();
                 classifiableNames = ts.createUnderscoreEscapedMap();
                 for (var _i = 0, files_2 = files; _i < files_2.length; _i++) {
@@ -65277,25 +81251,51 @@ var ts;
             return classifiableNames;
         }
         function resolveModuleNamesReusingOldState(moduleNames, containingFile, file, oldProgramState) {
-            if (structuralIsReused === 0 && !file.ambientModuleNames.length) {
+            if (structuralIsReused === 0 /* Not */ && !file.ambientModuleNames.length) {
+                // If the old program state does not permit reusing resolutions and `file` does not contain locally defined ambient modules,
+                // the best we can do is fallback to the default logic.
                 return resolveModuleNamesWorker(moduleNames, containingFile);
             }
             var oldSourceFile = oldProgramState.program && oldProgramState.program.getSourceFile(containingFile);
             if (oldSourceFile !== file && file.resolvedModules) {
-                var result_4 = [];
+                // `file` was created for the new program.
+                //
+                // We only set `file.resolvedModules` via work from the current function,
+                // so it is defined iff we already called the current function on `file`.
+                // That call happened no later than the creation of the `file` object,
+                // which per above occurred during the current program creation.
+                // Since we assume the filesystem does not change during program creation,
+                // it is safe to reuse resolutions from the earlier call.
+                var result_3 = [];
                 for (var _i = 0, moduleNames_1 = moduleNames; _i < moduleNames_1.length; _i++) {
                     var moduleName = moduleNames_1[_i];
                     var resolvedModule = file.resolvedModules.get(moduleName);
-                    result_4.push(resolvedModule);
+                    result_3.push(resolvedModule);
                 }
-                return result_4;
+                return result_3;
             }
+            // At this point, we know at least one of the following hold:
+            // - file has local declarations for ambient modules
+            // - old program state is available
+            // With this information, we can infer some module resolutions without performing resolution.
+            /** An ordered list of module names for which we cannot recover the resolution. */
             var unknownModuleNames;
+            /**
+             * The indexing of elements in this list matches that of `moduleNames`.
+             *
+             * Before combining results, result[i] is in one of the following states:
+             * * undefined: needs to be recomputed,
+             * * predictedToResolveToAmbientModuleMarker: known to be an ambient module.
+             * Needs to be reset to undefined before returning,
+             * * ResolvedModuleFull instance: can be reused.
+             */
             var result;
             var reusedNames;
+            /** A transient placeholder used to mark predicted resolution in the result list. */
             var predictedToResolveToAmbientModuleMarker = {};
             for (var i = 0; i < moduleNames.length; i++) {
                 var moduleName = moduleNames[i];
+                // If the source file is unchanged and doesnt have invalidated resolution, reuse the module resolutions
                 if (file === oldSourceFile && !hasInvalidatedResolution(oldSourceFile.path)) {
                     var oldResolvedModule = oldSourceFile && oldSourceFile.resolvedModules.get(moduleName);
                     if (oldResolvedModule) {
@@ -65307,6 +81307,10 @@ var ts;
                         continue;
                     }
                 }
+                // We know moduleName resolves to an ambient module provided that moduleName:
+                // - is in the list of ambient modules locally declared in the current source file.
+                // - resolved to an ambient module in the old program whose declaration is in an unmodified file
+                //   (so the same module declaration will land in the new program)
                 var resolvesToAmbientModuleInNonModifiedFile = false;
                 if (ts.contains(file.ambientModuleNames, moduleName)) {
                     resolvesToAmbientModuleInNonModifiedFile = true;
@@ -65321,21 +81325,26 @@ var ts;
                     (result || (result = new Array(moduleNames.length)))[i] = predictedToResolveToAmbientModuleMarker;
                 }
                 else {
+                    // Resolution failed in the old program, or resolved to an ambient module for which we can't reuse the result.
                     (unknownModuleNames || (unknownModuleNames = [])).push(moduleName);
                 }
             }
             var resolutions = unknownModuleNames && unknownModuleNames.length
                 ? resolveModuleNamesWorker(unknownModuleNames, containingFile, reusedNames)
                 : ts.emptyArray;
+            // Combine results of resolutions and predicted results
             if (!result) {
+                // There were no unresolved/ambient resolutions.
                 ts.Debug.assert(resolutions.length === moduleNames.length);
                 return resolutions;
             }
             var j = 0;
             for (var i = 0; i < result.length; i++) {
                 if (result[i]) {
+                    // `result[i]` is either a `ResolvedModuleFull` or a marker.
+                    // If it is the former, we can leave it as is.
                     if (result[i] === predictedToResolveToAmbientModuleMarker) {
-                        result[i] = undefined;
+                        result[i] = undefined; // TODO: GH#18217
                     }
                 }
                 else {
@@ -65345,16 +81354,23 @@ var ts;
             }
             ts.Debug.assert(j === resolutions.length);
             return result;
+            // If we change our policy of rechecking failed lookups on each program create,
+            // we should adjust the value returned here.
             function moduleNameResolvesToAmbientModuleInNonModifiedFile(moduleName, oldProgramState) {
-                var resolutionToFile = ts.getResolvedModule(oldProgramState.oldSourceFile, moduleName);
+                var resolutionToFile = ts.getResolvedModule(oldProgramState.oldSourceFile, moduleName); // TODO: GH#18217
                 var resolvedFile = resolutionToFile && oldProgramState.program && oldProgramState.program.getSourceFile(resolutionToFile.resolvedFileName);
                 if (resolutionToFile && resolvedFile && !resolvedFile.externalModuleIndicator) {
+                    // In the old program, we resolved to an ambient module that was in the same
+                    //   place as we expected to find an actual module file.
+                    // We actually need to return 'false' here even though this seems like a 'true' case
+                    //   because the normal module resolution algorithm will find this anyway.
                     return false;
                 }
                 var ambientModule = oldProgramState.program && oldProgramState.program.getTypeChecker().tryFindAmbientModuleWithoutAugmentations(moduleName);
                 if (!(ambientModule && ambientModule.declarations)) {
                     return false;
                 }
+                // at least one of declarations should come from non-modified source file
                 var firstUnmodifiedFile = ts.forEach(ambientModule.declarations, function (d) {
                     var f = ts.getSourceFileOfNode(d);
                     return !ts.contains(oldProgramState.modifiedFilePaths, f.path) && f;
@@ -65370,51 +81386,61 @@ var ts;
         }
         function tryReuseStructureFromOldProgram() {
             if (!oldProgram) {
-                return 0;
+                return 0 /* Not */;
             }
+            // check properties that can affect structure of the program or module resolution strategy
+            // if any of these properties has changed - structure cannot be reused
             var oldOptions = oldProgram.getCompilerOptions();
             if (ts.changesAffectModuleResolution(oldOptions, options)) {
-                return oldProgram.structureIsReused = 0;
+                return oldProgram.structureIsReused = 0 /* Not */;
             }
-            ts.Debug.assert(!(oldProgram.structureIsReused & (2 | 1)));
+            ts.Debug.assert(!(oldProgram.structureIsReused & (2 /* Completely */ | 1 /* SafeModules */)));
+            // there is an old program, check if we can reuse its structure
             var oldRootNames = oldProgram.getRootFileNames();
             if (!ts.arrayIsEqualTo(oldRootNames, rootNames)) {
-                return oldProgram.structureIsReused = 0;
+                return oldProgram.structureIsReused = 0 /* Not */;
             }
             if (!ts.arrayIsEqualTo(options.types, oldOptions.types)) {
-                return oldProgram.structureIsReused = 0;
+                return oldProgram.structureIsReused = 0 /* Not */;
             }
+            // Check if any referenced project tsconfig files are different
             var oldRefs = oldProgram.getProjectReferences();
             if (projectReferences) {
                 if (!oldRefs) {
-                    return oldProgram.structureIsReused = 0;
+                    return oldProgram.structureIsReused = 0 /* Not */;
                 }
                 for (var i = 0; i < projectReferences.length; i++) {
                     var oldRef = oldRefs[i];
                     if (oldRef) {
                         var newRef = parseProjectReferenceConfigFile(projectReferences[i]);
                         if (!newRef || newRef.sourceFile !== oldRef.sourceFile) {
-                            return oldProgram.structureIsReused = 0;
+                            // Resolved project reference has gone missing or changed
+                            return oldProgram.structureIsReused = 0 /* Not */;
                         }
                     }
                     else {
+                        // A previously-unresolved reference may be resolved now
                         if (parseProjectReferenceConfigFile(projectReferences[i]) !== undefined) {
-                            return oldProgram.structureIsReused = 0;
+                            return oldProgram.structureIsReused = 0 /* Not */;
                         }
                     }
                 }
             }
             else {
                 if (oldRefs) {
-                    return oldProgram.structureIsReused = 0;
+                    return oldProgram.structureIsReused = 0 /* Not */;
                 }
             }
+            // check if program source files has changed in the way that can affect structure of the program
             var newSourceFiles = [];
             var filePaths = [];
             var modifiedSourceFiles = [];
-            oldProgram.structureIsReused = 2;
+            oldProgram.structureIsReused = 2 /* Completely */;
+            // If the missing file paths are now present, it can change the progam structure,
+            // and hence cant reuse the structure.
+            // This is same as how we dont reuse the structure if one of the file from old program is now missing
             if (oldProgram.getMissingFilePaths().some(function (missingFilePath) { return host.fileExists(missingFilePath); })) {
-                return oldProgram.structureIsReused = 0;
+                return oldProgram.structureIsReused = 0 /* Not */;
             }
             var oldSourceFiles = oldProgram.getSourceFiles();
             var SeenPackageName;
@@ -65426,23 +81452,27 @@ var ts;
             for (var _i = 0, oldSourceFiles_2 = oldSourceFiles; _i < oldSourceFiles_2.length; _i++) {
                 var oldSourceFile = oldSourceFiles_2[_i];
                 var newSourceFile = host.getSourceFileByPath
-                    ? host.getSourceFileByPath(oldSourceFile.fileName, oldSourceFile.path, options.target, undefined, shouldCreateNewSourceFile)
-                    : host.getSourceFile(oldSourceFile.fileName, options.target, undefined, shouldCreateNewSourceFile);
+                    ? host.getSourceFileByPath(oldSourceFile.fileName, oldSourceFile.resolvedPath || oldSourceFile.path, options.target, /*onError*/ undefined, shouldCreateNewSourceFile)
+                    : host.getSourceFile(oldSourceFile.fileName, options.target, /*onError*/ undefined, shouldCreateNewSourceFile); // TODO: GH#18217
                 if (!newSourceFile) {
-                    return oldProgram.structureIsReused = 0;
+                    return oldProgram.structureIsReused = 0 /* Not */;
                 }
                 ts.Debug.assert(!newSourceFile.redirectInfo, "Host should not return a redirect source file from `getSourceFile`");
                 var fileChanged = void 0;
                 if (oldSourceFile.redirectInfo) {
+                    // We got `newSourceFile` by path, so it is actually for the unredirected file.
+                    // This lets us know if the unredirected file has changed. If it has we should break the redirect.
                     if (newSourceFile !== oldSourceFile.redirectInfo.unredirected) {
-                        return oldProgram.structureIsReused = 0;
+                        // Underlying file has changed. Might not redirect anymore. Must rebuild program.
+                        return oldProgram.structureIsReused = 0 /* Not */;
                     }
                     fileChanged = false;
-                    newSourceFile = oldSourceFile;
+                    newSourceFile = oldSourceFile; // Use the redirect.
                 }
                 else if (oldProgram.redirectTargetsSet.has(oldSourceFile.path)) {
+                    // If a redirected-to source file changes, the redirect may be broken.
                     if (newSourceFile !== oldSourceFile) {
-                        return oldProgram.structureIsReused = 0;
+                        return oldProgram.structureIsReused = 0 /* Not */;
                     }
                     fileChanged = false;
                 }
@@ -65453,45 +81483,66 @@ var ts;
                 filePaths.push(newSourceFile.path);
                 var packageName = oldProgram.sourceFileToPackageName.get(oldSourceFile.path);
                 if (packageName !== undefined) {
+                    // If there are 2 different source files for the same package name and at least one of them changes,
+                    // they might become redirects. So we must rebuild the program.
                     var prevKind = seenPackageNames.get(packageName);
-                    var newKind = fileChanged ? 1 : 0;
-                    if ((prevKind !== undefined && newKind === 1) || prevKind === 1) {
-                        return oldProgram.structureIsReused = 0;
+                    var newKind = fileChanged ? 1 /* Modified */ : 0 /* Exists */;
+                    if ((prevKind !== undefined && newKind === 1 /* Modified */) || prevKind === 1 /* Modified */) {
+                        return oldProgram.structureIsReused = 0 /* Not */;
                     }
                     seenPackageNames.set(packageName, newKind);
                 }
                 if (fileChanged) {
+                    // The `newSourceFile` object was created for the new program.
+                    if (!ts.arrayIsEqualTo(oldSourceFile.libReferenceDirectives, newSourceFile.libReferenceDirectives, fileReferenceIsEqualTo)) {
+                        // 'lib' references has changed. Matches behavior in changesAffectModuleResolution
+                        return oldProgram.structureIsReused = 0 /* Not */;
+                    }
                     if (oldSourceFile.hasNoDefaultLib !== newSourceFile.hasNoDefaultLib) {
-                        oldProgram.structureIsReused = 1;
+                        // value of no-default-lib has changed
+                        // this will affect if default library is injected into the list of files
+                        oldProgram.structureIsReused = 1 /* SafeModules */;
                     }
+                    // check tripleslash references
                     if (!ts.arrayIsEqualTo(oldSourceFile.referencedFiles, newSourceFile.referencedFiles, fileReferenceIsEqualTo)) {
-                        oldProgram.structureIsReused = 1;
+                        // tripleslash references has changed
+                        oldProgram.structureIsReused = 1 /* SafeModules */;
                     }
+                    // check imports and module augmentations
                     collectExternalModuleReferences(newSourceFile);
                     if (!ts.arrayIsEqualTo(oldSourceFile.imports, newSourceFile.imports, moduleNameIsEqualTo)) {
-                        oldProgram.structureIsReused = 1;
+                        // imports has changed
+                        oldProgram.structureIsReused = 1 /* SafeModules */;
                     }
                     if (!ts.arrayIsEqualTo(oldSourceFile.moduleAugmentations, newSourceFile.moduleAugmentations, moduleNameIsEqualTo)) {
-                        oldProgram.structureIsReused = 1;
+                        // moduleAugmentations has changed
+                        oldProgram.structureIsReused = 1 /* SafeModules */;
                     }
-                    if ((oldSourceFile.flags & 1572864) !== (newSourceFile.flags & 1572864)) {
-                        oldProgram.structureIsReused = 1;
+                    if ((oldSourceFile.flags & 1572864 /* PermanentlySetIncrementalFlags */) !== (newSourceFile.flags & 1572864 /* PermanentlySetIncrementalFlags */)) {
+                        // dynamicImport has changed
+                        oldProgram.structureIsReused = 1 /* SafeModules */;
                     }
                     if (!ts.arrayIsEqualTo(oldSourceFile.typeReferenceDirectives, newSourceFile.typeReferenceDirectives, fileReferenceIsEqualTo)) {
-                        oldProgram.structureIsReused = 1;
+                        // 'types' references has changed
+                        oldProgram.structureIsReused = 1 /* SafeModules */;
                     }
+                    // tentatively approve the file
                     modifiedSourceFiles.push({ oldFile: oldSourceFile, newFile: newSourceFile });
                 }
                 else if (hasInvalidatedResolution(oldSourceFile.path)) {
-                    oldProgram.structureIsReused = 1;
+                    // 'module/types' references could have changed
+                    oldProgram.structureIsReused = 1 /* SafeModules */;
+                    // add file to the modified list so that we will resolve it later
                     modifiedSourceFiles.push({ oldFile: oldSourceFile, newFile: newSourceFile });
                 }
+                // if file has passed all checks it should be safe to reuse it
                 newSourceFiles.push(newSourceFile);
             }
-            if (oldProgram.structureIsReused !== 2) {
+            if (oldProgram.structureIsReused !== 2 /* Completely */) {
                 return oldProgram.structureIsReused;
             }
             modifiedFilePaths = modifiedSourceFiles.map(function (f) { return f.newFile.path; });
+            // try to verify results of module resolution
             for (var _a = 0, modifiedSourceFiles_1 = modifiedSourceFiles; _a < modifiedSourceFiles_1.length; _a++) {
                 var _b = modifiedSourceFiles_1[_a], oldSourceFile = _b.oldFile, newSourceFile = _b.newFile;
                 var newSourceFilePath = ts.getNormalizedAbsolutePath(newSourceFile.fileName, currentDirectory);
@@ -65499,9 +81550,10 @@ var ts;
                     var moduleNames = getModuleNames(newSourceFile);
                     var oldProgramState = { program: oldProgram, oldSourceFile: oldSourceFile, modifiedFilePaths: modifiedFilePaths };
                     var resolutions = resolveModuleNamesReusingOldState(moduleNames, newSourceFilePath, newSourceFile, oldProgramState);
+                    // ensure that module resolution results are still correct
                     var resolutionsChanged = ts.hasChangesInResolutions(moduleNames, resolutions, oldSourceFile.resolvedModules, ts.moduleResolutionIsEqualTo);
                     if (resolutionsChanged) {
-                        oldProgram.structureIsReused = 1;
+                        oldProgram.structureIsReused = 1 /* SafeModules */;
                         newSourceFile.resolvedModules = ts.zipToMap(moduleNames, resolutions);
                     }
                     else {
@@ -65511,9 +81563,10 @@ var ts;
                 if (resolveTypeReferenceDirectiveNamesWorker) {
                     var typesReferenceDirectives = ts.map(newSourceFile.typeReferenceDirectives, function (x) { return x.fileName; });
                     var resolutions = resolveTypeReferenceDirectiveNamesWorker(typesReferenceDirectives, newSourceFilePath);
+                    // ensure that types resolutions are still correct
                     var resolutionsChanged = ts.hasChangesInResolutions(typesReferenceDirectives, resolutions, oldSourceFile.resolvedTypeReferenceDirectiveNames, ts.typeDirectiveIsEqualTo);
                     if (resolutionsChanged) {
-                        oldProgram.structureIsReused = 1;
+                        oldProgram.structureIsReused = 1 /* SafeModules */;
                         newSourceFile.resolvedTypeReferenceDirectiveNames = ts.zipToMap(typesReferenceDirectives, resolutions);
                     }
                     else {
@@ -65521,15 +81574,17 @@ var ts;
                     }
                 }
             }
-            if (oldProgram.structureIsReused !== 2) {
+            if (oldProgram.structureIsReused !== 2 /* Completely */) {
                 return oldProgram.structureIsReused;
             }
             if (host.hasChangedAutomaticTypeDirectiveNames) {
-                return oldProgram.structureIsReused = 1;
+                return oldProgram.structureIsReused = 1 /* SafeModules */;
             }
             missingFilePaths = oldProgram.getMissingFilePaths();
+            // update fileName -> file mapping
             for (var i = 0; i < newSourceFiles.length; i++) {
                 filesByName.set(filePaths[i], newSourceFiles[i]);
+                // Set the file as found during node modules search if it was found that way in old progra,
                 if (oldProgram.isSourceFileFromExternalLibrary(oldProgram.getSourceFileByPath(filePaths[i]))) {
                     sourceFilesFoundSearchingNodeModules.set(filePaths[i], true);
                 }
@@ -65543,23 +81598,11 @@ var ts;
             resolvedTypeReferenceDirectives = oldProgram.getResolvedTypeReferenceDirectives();
             sourceFileToPackageName = oldProgram.sourceFileToPackageName;
             redirectTargetsSet = oldProgram.redirectTargetsSet;
-            return oldProgram.structureIsReused = 2;
+            return oldProgram.structureIsReused = 2 /* Completely */;
         }
         function getEmitHost(writeFileCallback) {
-            return {
-                getPrependNodes: getPrependNodes,
-                getCanonicalFileName: getCanonicalFileName,
-                getCommonSourceDirectory: program.getCommonSourceDirectory,
-                getCompilerOptions: program.getCompilerOptions,
-                getCurrentDirectory: function () { return currentDirectory; },
-                getNewLine: function () { return host.getNewLine(); },
-                getSourceFile: program.getSourceFile,
-                getSourceFileByPath: program.getSourceFileByPath,
-                getSourceFiles: program.getSourceFiles,
-                isSourceFileFromExternalLibrary: isSourceFileFromExternalLibrary,
-                writeFile: writeFileCallback || (function (fileName, data, writeByteOrderMark, onError, sourceFiles) { return host.writeFile(fileName, data, writeByteOrderMark, onError, sourceFiles); }),
-                isEmitBlocked: isEmitBlocked,
-            };
+            return __assign({ getPrependNodes: getPrependNodes,
+                getCanonicalFileName: getCanonicalFileName, getCommonSourceDirectory: program.getCommonSourceDirectory, getCompilerOptions: program.getCompilerOptions, getCurrentDirectory: function () { return currentDirectory; }, getNewLine: function () { return host.getNewLine(); }, getSourceFile: program.getSourceFile, getSourceFileByPath: program.getSourceFileByPath, getSourceFiles: program.getSourceFiles, isSourceFileFromExternalLibrary: isSourceFileFromExternalLibrary, writeFile: writeFileCallback || (function (fileName, data, writeByteOrderMark, onError, sourceFiles) { return host.writeFile(fileName, data, writeByteOrderMark, onError, sourceFiles); }), isEmitBlocked: isEmitBlocked, readFile: function (f) { return host.readFile(f); }, fileExists: function (f) { return host.fileExists(f); } }, (host.directoryExists ? { directoryExists: function (f) { return host.directoryExists(f); } } : {}));
         }
         function getProjectReferences() {
             if (!resolvedProjectReferences)
@@ -65575,12 +81618,15 @@ var ts;
                 var ref = projectReferences[i];
                 var resolvedRefOpts = resolvedProjectReferences[i].commandLine;
                 if (ref.prepend && resolvedRefOpts && resolvedRefOpts.options) {
+                    // Upstream project didn't have outFile set -- skip (error will have been issued earlier)
                     if (!resolvedRefOpts.options.outFile)
                         continue;
                     var dtsFilename = ts.changeExtension(resolvedRefOpts.options.outFile, ".d.ts");
                     var js = host.readFile(resolvedRefOpts.options.outFile) || "/* Input file " + resolvedRefOpts.options.outFile + " was missing */\r\n";
+                    var jsMap = host.readFile(resolvedRefOpts.options.outFile + ".map"); // TODO: try to read sourceMappingUrl comment from the js file
                     var dts = host.readFile(dtsFilename) || "/* Input file " + dtsFilename + " was missing */\r\n";
-                    var node = ts.createInputFiles(js, dts);
+                    var dtsMap = host.readFile(dtsFilename + ".map");
+                    var node = ts.createInputFiles(js, dts, jsMap, dtsMap);
                     nodes.push(node);
                 }
             }
@@ -65596,6 +81642,8 @@ var ts;
             if (!options.noLib) {
                 return false;
             }
+            // If '--lib' is not specified, include default library file according to '--target'
+            // otherwise, using options specified in '--lib' instead of '--target' default library file
             var equalityComparer = host.useCaseSensitiveFileNames() ? ts.equateStringsCaseSensitive : ts.equateStringsCaseInsensitive;
             if (!options.lib) {
                 return equalityComparer(file.fileName, getDefaultLibraryFileName());
@@ -65605,13 +81653,13 @@ var ts;
             }
         }
         function getDiagnosticsProducingTypeChecker() {
-            return diagnosticsProducingTypeChecker || (diagnosticsProducingTypeChecker = ts.createTypeChecker(program, true));
+            return diagnosticsProducingTypeChecker || (diagnosticsProducingTypeChecker = ts.createTypeChecker(program, /*produceDiagnostics:*/ true));
         }
         function dropDiagnosticsProducingTypeChecker() {
             diagnosticsProducingTypeChecker = undefined;
         }
         function getTypeChecker() {
-            return noDiagnosticsTypeChecker || (noDiagnosticsTypeChecker = ts.createTypeChecker(program, false));
+            return noDiagnosticsTypeChecker || (noDiagnosticsTypeChecker = ts.createTypeChecker(program, /*produceDiagnostics:*/ false));
         }
         function emit(sourceFile, writeFileCallback, cancellationToken, emitOnlyDtsFiles, transformers) {
             return runWithCancellationToken(function () { return emitWorker(program, sourceFile, writeFileCallback, cancellationToken, emitOnlyDtsFiles, transformers); });
@@ -65625,10 +81673,13 @@ var ts;
                 if (options.noEmit) {
                     return { diagnostics: declarationDiagnostics, sourceMaps: undefined, emittedFiles: undefined, emitSkipped: true };
                 }
+                // If the noEmitOnError flag is set, then check if we have any errors so far.  If so,
+                // immediately bail out.  Note that we pass 'undefined' for 'sourceFile' so that we
+                // get any preEmit diagnostics, not just the ones
                 if (options.noEmitOnError) {
                     var diagnostics = program.getOptionsDiagnostics(cancellationToken).concat(program.getSyntacticDiagnostics(sourceFile, cancellationToken), program.getGlobalDiagnostics(cancellationToken), program.getSemanticDiagnostics(sourceFile, cancellationToken));
                     if (diagnostics.length === 0 && program.getCompilerOptions().declaration) {
-                        declarationDiagnostics = program.getDeclarationDiagnostics(undefined, cancellationToken);
+                        declarationDiagnostics = program.getDeclarationDiagnostics(/*sourceFile*/ undefined, cancellationToken);
                     }
                     if (diagnostics.length > 0 || declarationDiagnostics.length > 0) {
                         return {
@@ -65640,10 +81691,19 @@ var ts;
                     }
                 }
             }
+            // Create the emit resolver outside of the "emitTime" tracking code below.  That way
+            // any cost associated with it (like type checking) are appropriate associated with
+            // the type-checking counter.
+            //
+            // If the -out option is specified, we should not pass the source file to getEmitResolver.
+            // This is because in the -out scenario all files need to be emitted, and therefore all
+            // files need to be type checked. And the way to specify that all files need to be type
+            // checked is to not pass the file to getEmitResolver.
             var emitResolver = getDiagnosticsProducingTypeChecker().getEmitResolver((options.outFile || options.out) ? undefined : sourceFile, cancellationToken);
             ts.performance.mark("beforeEmit");
             var transformers = emitOnlyDtsFiles ? [] : ts.getTransformers(options, customTransformers);
-            var emitResult = ts.emitFiles(emitResolver, getEmitHost(writeFileCallback), sourceFile, emitOnlyDtsFiles, transformers, customTransformers && customTransformers.afterDeclarations);
+            var emitResult = ts.emitFiles(emitResolver, getEmitHost(writeFileCallback), sourceFile, // TODO: GH#18217
+            emitOnlyDtsFiles, transformers, customTransformers && customTransformers.afterDeclarations);
             ts.performance.mark("afterEmit");
             ts.performance.measure("Emit", "beforeEmit", "afterEmit");
             return emitResult;
@@ -65673,6 +81733,7 @@ var ts;
         }
         function getDeclarationDiagnostics(sourceFile, cancellationToken) {
             var options = program.getCompilerOptions();
+            // collect diagnostics from the program only once if either no source file was specified or out/outFile is set (bundled emit)
             if (!sourceFile || options.out || options.outFile) {
                 return getDeclarationDiagnosticsWorker(sourceFile, cancellationToken);
             }
@@ -65681,6 +81742,8 @@ var ts;
             }
         }
         function getSyntacticDiagnosticsForFile(sourceFile) {
+            // For JavaScript files, we report semantic errors for using TypeScript-only
+            // constructs from within a JavaScript file as syntactic errors.
             if (ts.isSourceFileJavaScript(sourceFile)) {
                 if (!sourceFile.additionalSyntacticDiagnostics) {
                     sourceFile.additionalSyntacticDiagnostics = getJavaScriptSyntacticDiagnosticsForFile(sourceFile);
@@ -65695,6 +81758,15 @@ var ts;
             }
             catch (e) {
                 if (e instanceof ts.OperationCanceledException) {
+                    // We were canceled while performing the operation.  Because our type checker
+                    // might be a bad state, we need to throw it away.
+                    //
+                    // Note: we are overly aggressive here.  We do not actually *have* to throw away
+                    // the "noDiagnosticsTypeChecker".  However, for simplicity, i'd like to keep
+                    // the lifetimes of these two TypeCheckers the same.  Also, we generally only
+                    // cancel when the user has made a change anyways.  And, in that case, we (the
+                    // program instance) will get thrown away anyways.  So trying to keep one of
+                    // these type checkers alive doesn't serve much purpose.
                     noDiagnosticsTypeChecker = undefined;
                     diagnosticsProducingTypeChecker = undefined;
                 }
@@ -65706,14 +81778,18 @@ var ts;
         }
         function getSemanticDiagnosticsForFileNoCache(sourceFile, cancellationToken) {
             return runWithCancellationToken(function () {
+                // If skipLibCheck is enabled, skip reporting errors if file is a declaration file.
+                // If skipDefaultLibCheck is enabled, skip reporting errors if file contains a
+                // '/// <reference no-default-lib="true"/>' directive.
                 if (options.skipLibCheck && sourceFile.isDeclarationFile || options.skipDefaultLibCheck && sourceFile.hasNoDefaultLib) {
                     return ts.emptyArray;
                 }
                 var typeChecker = getDiagnosticsProducingTypeChecker();
                 ts.Debug.assert(!!sourceFile.bindDiagnostics);
                 var isCheckJs = ts.isCheckJsEnabledForFile(sourceFile, options);
-                var includeBindAndCheckDiagnostics = sourceFile.scriptKind === 3 || sourceFile.scriptKind === 4 ||
-                    sourceFile.scriptKind === 5 || isCheckJs || sourceFile.scriptKind === 7;
+                // By default, only type-check .ts, .tsx, 'Deferred' and 'External' files (external files are added by plugins)
+                var includeBindAndCheckDiagnostics = sourceFile.scriptKind === 3 /* TS */ || sourceFile.scriptKind === 4 /* TSX */ ||
+                    sourceFile.scriptKind === 5 /* External */ || isCheckJs || sourceFile.scriptKind === 7 /* Deferred */;
                 var bindDiagnostics = includeBindAndCheckDiagnostics ? sourceFile.bindDiagnostics : ts.emptyArray;
                 var checkDiagnostics = includeBindAndCheckDiagnostics ? typeChecker.getDiagnostics(sourceFile, cancellationToken) : ts.emptyArray;
                 var fileProcessingDiagnosticsInFile = fileProcessingDiagnostics.getDiagnostics(sourceFile.fileName);
@@ -65738,18 +81814,23 @@ var ts;
                 return getDiagnosticsProducingTypeChecker().getSuggestionDiagnostics(sourceFile, cancellationToken);
             });
         }
+        /**
+         * Skip errors if previous line start with '// @ts-ignore' comment, not counting non-empty non-comment lines
+         */
         function shouldReportDiagnostic(diagnostic) {
             var file = diagnostic.file, start = diagnostic.start;
             if (file) {
                 var lineStarts = ts.getLineStarts(file);
-                var line = ts.computeLineAndCharacterOfPosition(lineStarts, start).line;
+                var line = ts.computeLineAndCharacterOfPosition(lineStarts, start).line; // TODO: GH#18217
                 while (line > 0) {
                     var previousLineText = file.text.slice(lineStarts[line - 1], lineStarts[line]);
                     var result = ignoreDiagnosticCommentRegEx.exec(previousLineText);
                     if (!result) {
+                        // non-empty line
                         return true;
                     }
                     if (result[3]) {
+                        // @ts-ignore
                         return false;
                     }
                     line--;
@@ -65764,64 +81845,68 @@ var ts;
                 walk(sourceFile);
                 return diagnostics;
                 function walk(node) {
+                    // Return directly from the case if the given node doesnt want to visit each child
+                    // Otherwise break to visit each child
                     switch (parent.kind) {
-                        case 149:
-                        case 152:
+                        case 149 /* Parameter */:
+                        case 152 /* PropertyDeclaration */:
                             if (parent.questionToken === node) {
                                 diagnostics.push(createDiagnosticForNode(node, ts.Diagnostics._0_can_only_be_used_in_a_ts_file, "?"));
                                 return;
                             }
-                        case 154:
-                        case 153:
-                        case 155:
-                        case 156:
-                        case 157:
-                        case 192:
-                        case 234:
-                        case 193:
-                        case 232:
+                        // falls through
+                        case 154 /* MethodDeclaration */:
+                        case 153 /* MethodSignature */:
+                        case 155 /* Constructor */:
+                        case 156 /* GetAccessor */:
+                        case 157 /* SetAccessor */:
+                        case 192 /* FunctionExpression */:
+                        case 234 /* FunctionDeclaration */:
+                        case 193 /* ArrowFunction */:
+                        case 232 /* VariableDeclaration */:
+                            // type annotation
                             if (parent.type === node) {
                                 diagnostics.push(createDiagnosticForNode(node, ts.Diagnostics.types_can_only_be_used_in_a_ts_file));
                                 return;
                             }
                     }
                     switch (node.kind) {
-                        case 243:
+                        case 243 /* ImportEqualsDeclaration */:
                             diagnostics.push(createDiagnosticForNode(node, ts.Diagnostics.import_can_only_be_used_in_a_ts_file));
                             return;
-                        case 249:
+                        case 249 /* ExportAssignment */:
                             if (node.isExportEquals) {
                                 diagnostics.push(createDiagnosticForNode(node, ts.Diagnostics.export_can_only_be_used_in_a_ts_file));
                                 return;
                             }
                             break;
-                        case 268:
+                        case 268 /* HeritageClause */:
                             var heritageClause = node;
-                            if (heritageClause.token === 108) {
+                            if (heritageClause.token === 108 /* ImplementsKeyword */) {
                                 diagnostics.push(createDiagnosticForNode(node, ts.Diagnostics.implements_clauses_can_only_be_used_in_a_ts_file));
                                 return;
                             }
                             break;
-                        case 236:
+                        case 236 /* InterfaceDeclaration */:
                             diagnostics.push(createDiagnosticForNode(node, ts.Diagnostics.interface_declarations_can_only_be_used_in_a_ts_file));
                             return;
-                        case 239:
+                        case 239 /* ModuleDeclaration */:
                             diagnostics.push(createDiagnosticForNode(node, ts.Diagnostics.module_declarations_can_only_be_used_in_a_ts_file));
                             return;
-                        case 237:
+                        case 237 /* TypeAliasDeclaration */:
                             diagnostics.push(createDiagnosticForNode(node, ts.Diagnostics.type_aliases_can_only_be_used_in_a_ts_file));
                             return;
-                        case 238:
+                        case 238 /* EnumDeclaration */:
                             diagnostics.push(createDiagnosticForNode(node, ts.Diagnostics.enum_declarations_can_only_be_used_in_a_ts_file));
                             return;
-                        case 209:
+                        case 209 /* NonNullExpression */:
                             diagnostics.push(createDiagnosticForNode(node, ts.Diagnostics.non_null_assertions_can_only_be_used_in_a_ts_file));
                             return;
-                        case 208:
+                        case 208 /* AsExpression */:
                             diagnostics.push(createDiagnosticForNode(node.type, ts.Diagnostics.type_assertion_expressions_can_only_be_used_in_a_ts_file));
                             return;
-                        case 190:
-                            ts.Debug.fail();
+                        case 190 /* TypeAssertionExpression */:
+                            ts.Debug.fail(); // Won't parse these in a JS file anyway, as they are interpreted as JSX.
                     }
                     var prevParent = parent;
                     parent = node;
@@ -65833,54 +81918,60 @@ var ts;
                         diagnostics.push(createDiagnosticForNode(parent, ts.Diagnostics.Experimental_support_for_decorators_is_a_feature_that_is_subject_to_change_in_a_future_release_Set_the_experimentalDecorators_option_to_remove_this_warning));
                     }
                     switch (parent.kind) {
-                        case 235:
-                        case 154:
-                        case 153:
-                        case 155:
-                        case 156:
-                        case 157:
-                        case 192:
-                        case 234:
-                        case 193:
+                        case 235 /* ClassDeclaration */:
+                        case 154 /* MethodDeclaration */:
+                        case 153 /* MethodSignature */:
+                        case 155 /* Constructor */:
+                        case 156 /* GetAccessor */:
+                        case 157 /* SetAccessor */:
+                        case 192 /* FunctionExpression */:
+                        case 234 /* FunctionDeclaration */:
+                        case 193 /* ArrowFunction */:
+                            // Check type parameters
                             if (nodes === parent.typeParameters) {
                                 diagnostics.push(createDiagnosticForNodeArray(nodes, ts.Diagnostics.type_parameter_declarations_can_only_be_used_in_a_ts_file));
                                 return;
                             }
-                        case 214:
+                        // falls through
+                        case 214 /* VariableStatement */:
+                            // Check modifiers
                             if (nodes === parent.modifiers) {
-                                return checkModifiers(nodes, parent.kind === 214);
+                                return checkModifiers(nodes, parent.kind === 214 /* VariableStatement */);
                             }
                             break;
-                        case 152:
+                        case 152 /* PropertyDeclaration */:
+                            // Check modifiers of property declaration
                             if (nodes === parent.modifiers) {
                                 for (var _i = 0, _a = nodes; _i < _a.length; _i++) {
                                     var modifier = _a[_i];
-                                    if (modifier.kind !== 115) {
+                                    if (modifier.kind !== 115 /* StaticKeyword */) {
                                         diagnostics.push(createDiagnosticForNode(modifier, ts.Diagnostics._0_can_only_be_used_in_a_ts_file, ts.tokenToString(modifier.kind)));
                                     }
                                 }
                                 return;
                             }
                             break;
-                        case 149:
+                        case 149 /* Parameter */:
+                            // Check modifiers of parameter declaration
                             if (nodes === parent.modifiers) {
                                 diagnostics.push(createDiagnosticForNodeArray(nodes, ts.Diagnostics.parameter_modifiers_can_only_be_used_in_a_ts_file));
                                 return;
                             }
                             break;
-                        case 187:
-                        case 188:
-                        case 207:
-                        case 256:
-                        case 257:
+                        case 187 /* CallExpression */:
+                        case 188 /* NewExpression */:
+                        case 207 /* ExpressionWithTypeArguments */:
+                        case 256 /* JsxSelfClosingElement */:
+                        case 257 /* JsxOpeningElement */:
+                            // Check type arguments
                             if (nodes === parent.typeArguments) {
                                 diagnostics.push(createDiagnosticForNodeArray(nodes, ts.Diagnostics.type_arguments_can_only_be_used_in_a_ts_file));
                                 return;
                             }
                             break;
                     }
-                    for (var _b = 0, nodes_6 = nodes; _b < nodes_6.length; _b++) {
-                        var node = nodes_6[_b];
+                    for (var _b = 0, nodes_5 = nodes; _b < nodes_5.length; _b++) {
+                        var node = nodes_5[_b];
                         walk(node);
                     }
                 }
@@ -65888,21 +81979,24 @@ var ts;
                     for (var _i = 0, modifiers_1 = modifiers; _i < modifiers_1.length; _i++) {
                         var modifier = modifiers_1[_i];
                         switch (modifier.kind) {
-                            case 76:
+                            case 76 /* ConstKeyword */:
                                 if (isConstValid) {
                                     continue;
                                 }
-                            case 114:
-                            case 112:
-                            case 113:
-                            case 132:
-                            case 124:
-                            case 117:
+                            // to report error,
+                            // falls through
+                            case 114 /* PublicKeyword */:
+                            case 112 /* PrivateKeyword */:
+                            case 113 /* ProtectedKeyword */:
+                            case 132 /* ReadonlyKeyword */:
+                            case 124 /* DeclareKeyword */:
+                            case 117 /* AbstractKeyword */:
                                 diagnostics.push(createDiagnosticForNode(modifier, ts.Diagnostics._0_can_only_be_used_in_a_ts_file, ts.tokenToString(modifier.kind)));
                                 break;
-                            case 115:
-                            case 84:
-                            case 79:
+                            // These are all legal modifiers.
+                            case 115 /* StaticKeyword */:
+                            case 84 /* ExportKeyword */:
+                            case 79 /* DefaultKeyword */:
                         }
                     }
                 }
@@ -65910,6 +82004,8 @@ var ts;
                     var start = nodes.pos;
                     return ts.createFileDiagnostic(sourceFile, start, nodes.end - start, message, arg0, arg1, arg2);
                 }
+                // Since these are syntactic diagnostics, parent might not have been set
+                // this means the sourceFile cannot be infered from the node
                 function createDiagnosticForNode(node, message, arg0, arg1, arg2) {
                     return ts.createDiagnosticForNodeInSourceFile(sourceFile, node, message, arg0, arg1, arg2);
                 }
@@ -65921,6 +82017,7 @@ var ts;
         function getDeclarationDiagnosticsForFileNoCache(sourceFile, cancellationToken) {
             return runWithCancellationToken(function () {
                 var resolver = getDiagnosticsProducingTypeChecker().getEmitResolver(sourceFile, cancellationToken);
+                // Don't actually write any files since we're just getting diagnostics.
                 return ts.getDeclarationDiagnostics(getEmitHost(ts.noop), resolver, sourceFile);
             });
         }
@@ -65931,7 +82028,7 @@ var ts;
             if (cachedResult) {
                 return cachedResult;
             }
-            var result = getDiagnostics(sourceFile, cancellationToken) || ts.emptyArray;
+            var result = getDiagnostics(sourceFile, cancellationToken) || ts.emptyArray; // TODO: GH#18217
             if (sourceFile) {
                 if (!cache.perFile) {
                     cache.perFile = ts.createMap();
@@ -65955,16 +82052,16 @@ var ts;
         function getConfigFileParsingDiagnostics() {
             return configFileParsingDiagnostics || ts.emptyArray;
         }
-        function processRootFile(fileName, isDefaultLib) {
-            processSourceFile(ts.normalizePath(fileName), isDefaultLib, undefined);
+        function processRootFile(fileName, isDefaultLib, ignoreNoDefaultLib) {
+            processSourceFile(ts.normalizePath(fileName), isDefaultLib, ignoreNoDefaultLib, /*packageId*/ undefined);
         }
         function fileReferenceIsEqualTo(a, b) {
             return a.fileName === b.fileName;
         }
         function moduleNameIsEqualTo(a, b) {
-            return a.kind === 71
-                ? b.kind === 71 && a.escapedText === b.escapedText
-                : b.kind === 9 && a.text === b.text;
+            return a.kind === 71 /* Identifier */
+                ? b.kind === 71 /* Identifier */ && a.escapedText === b.escapedText
+                : b.kind === 9 /* StringLiteral */ && a.text === b.text;
         }
         function collectExternalModuleReferences(file) {
             if (file.imports) {
@@ -65972,27 +82069,31 @@ var ts;
             }
             var isJavaScriptFile = ts.isSourceFileJavaScript(file);
             var isExternalModuleFile = ts.isExternalModule(file);
+            // file.imports may not be undefined if there exists dynamic import
             var imports;
             var moduleAugmentations;
             var ambientModules;
+            // If we are importing helpers, we need to add a synthetic reference to resolve the
+            // helpers library.
             if (options.importHelpers
                 && (options.isolatedModules || isExternalModuleFile)
                 && !file.isDeclarationFile) {
+                // synthesize 'import "tslib"' declaration
                 var externalHelpersModuleReference = ts.createLiteral(ts.externalHelpersModuleNameText);
-                var importDecl = ts.createImportDeclaration(undefined, undefined, undefined, externalHelpersModuleReference);
-                ts.addEmitFlags(importDecl, 67108864);
+                var importDecl = ts.createImportDeclaration(/*decorators*/ undefined, /*modifiers*/ undefined, /*importClause*/ undefined, externalHelpersModuleReference);
+                ts.addEmitFlags(importDecl, 67108864 /* NeverApplyImportHelper */);
                 externalHelpersModuleReference.parent = importDecl;
                 importDecl.parent = file;
                 imports = [externalHelpersModuleReference];
             }
             for (var _i = 0, _a = file.statements; _i < _a.length; _i++) {
                 var node = _a[_i];
-                collectModuleReferences(node, false);
-                if ((file.flags & 524288) || isJavaScriptFile) {
+                collectModuleReferences(node, /*inAmbientModule*/ false);
+                if ((file.flags & 524288 /* PossiblyContainsDynamicImport */) || isJavaScriptFile) {
                     collectDynamicImportOrRequireCalls(node);
                 }
             }
-            if ((file.flags & 524288) || isJavaScriptFile) {
+            if ((file.flags & 524288 /* PossiblyContainsDynamicImport */) || isJavaScriptFile) {
                 collectDynamicImportOrRequireCalls(file.endOfFileToken);
             }
             file.imports = imports || ts.emptyArray;
@@ -66002,25 +82103,39 @@ var ts;
             function collectModuleReferences(node, inAmbientModule) {
                 if (ts.isAnyImportOrReExport(node)) {
                     var moduleNameExpr = ts.getExternalModuleName(node);
+                    // TypeScript 1.0 spec (April 2014): 12.1.6
+                    // An ExternalImportDeclaration in an AmbientExternalModuleDeclaration may reference other external modules
+                    // only through top - level external module names. Relative external module names are not permitted.
                     if (moduleNameExpr && ts.isStringLiteral(moduleNameExpr) && moduleNameExpr.text && (!inAmbientModule || !ts.isExternalModuleNameRelative(moduleNameExpr.text))) {
                         imports = ts.append(imports, moduleNameExpr);
                     }
                 }
                 else if (ts.isModuleDeclaration(node)) {
-                    if (ts.isAmbientModule(node) && (inAmbientModule || ts.hasModifier(node, 2) || file.isDeclarationFile)) {
+                    if (ts.isAmbientModule(node) && (inAmbientModule || ts.hasModifier(node, 2 /* Ambient */) || file.isDeclarationFile)) {
                         var nameText = ts.getTextOfIdentifierOrLiteral(node.name);
+                        // Ambient module declarations can be interpreted as augmentations for some existing external modules.
+                        // This will happen in two cases:
+                        // - if current file is external module then module augmentation is a ambient module declaration defined in the top level scope
+                        // - if current file is not external module then module augmentation is an ambient module declaration with non-relative module name
+                        //   immediately nested in top level ambient module declaration .
                         if (isExternalModuleFile || (inAmbientModule && !ts.isExternalModuleNameRelative(nameText))) {
                             (moduleAugmentations || (moduleAugmentations = [])).push(node.name);
                         }
                         else if (!inAmbientModule) {
                             if (file.isDeclarationFile) {
+                                // for global .d.ts files record name of ambient module
                                 (ambientModules || (ambientModules = [])).push(nameText);
                             }
+                            // An AmbientExternalModuleDeclaration declares an external module.
+                            // This type of declaration is permitted only in the global module.
+                            // The StringLiteral must specify a top - level external module name.
+                            // Relative external module names are not permitted
+                            // NOTE: body of ambient module is always a module block, if it exists
                             var body = node.body;
                             if (body) {
                                 for (var _i = 0, _a = body.statements; _i < _a.length; _i++) {
                                     var statement = _a[_i];
-                                    collectModuleReferences(statement, true);
+                                    collectModuleReferences(statement, /*inAmbientModule*/ true);
                                 }
                             }
                         }
@@ -66028,26 +82143,33 @@ var ts;
                 }
             }
             function collectDynamicImportOrRequireCalls(node) {
-                if (ts.isRequireCall(node, true)) {
+                if (ts.isRequireCall(node, /*checkArgumentIsStringLiteralLike*/ true)) {
                     imports = ts.append(imports, node.arguments[0]);
                 }
+                // we have to check the argument list has length of 1. We will still have to process these even though we have parsing error.
                 else if (ts.isImportCall(node) && node.arguments.length === 1 && ts.isStringLiteralLike(node.arguments[0])) {
                     imports = ts.append(imports, node.arguments[0]);
                 }
                 else if (ts.isLiteralImportTypeNode(node)) {
                     imports = ts.append(imports, node.argument.literal);
                 }
-                else {
-                    collectDynamicImportOrRequireCallsForEachChild(node);
-                    if (ts.hasJSDocNodes(node)) {
-                        ts.forEach(node.jsDoc, collectDynamicImportOrRequireCallsForEachChild);
-                    }
+                collectDynamicImportOrRequireCallsForEachChild(node);
+                if (ts.hasJSDocNodes(node)) {
+                    ts.forEach(node.jsDoc, collectDynamicImportOrRequireCallsForEachChild);
                 }
             }
             function collectDynamicImportOrRequireCallsForEachChild(node) {
                 ts.forEachChild(node, collectDynamicImportOrRequireCalls);
             }
         }
+        function getLibFileFromReference(ref) {
+            var libName = ref.fileName.toLocaleLowerCase();
+            var libFileName = ts.libMap.get(libName);
+            if (libFileName) {
+                return getSourceFile(ts.combinePaths(defaultLibraryPath, libFileName));
+            }
+        }
+        /** This should have similar behavior to 'processSourceFile' without diagnostics or mutation. */
         function getSourceFileFromReference(referencingFile, ref) {
             return getSourceFileFromReferenceWorker(resolveTripleslashReference(ref.fileName, referencingFile.fileName), function (fileName) { return filesByName.get(toPath(fileName)); });
         }
@@ -66085,12 +82207,14 @@ var ts;
                 }
                 var sourceFileWithAddedExtension = ts.forEach(supportedExtensions, function (extension) { return getSourceFile(fileName + extension); });
                 if (fail && !sourceFileWithAddedExtension)
-                    fail(ts.Diagnostics.File_0_not_found, fileName + ".ts");
+                    fail(ts.Diagnostics.File_0_not_found, fileName + ".ts" /* Ts */);
                 return sourceFileWithAddedExtension;
             }
         }
-        function processSourceFile(fileName, isDefaultLib, packageId, refFile, refPos, refEnd) {
-            getSourceFileFromReferenceWorker(fileName, function (fileName) { return findSourceFile(fileName, toPath(fileName), isDefaultLib, refFile, refPos, refEnd, packageId); }, function (diagnostic) {
+        /** This has side effects through `findSourceFile`. */
+        function processSourceFile(fileName, isDefaultLib, ignoreNoDefaultLib, packageId, refFile, refPos, refEnd) {
+            getSourceFileFromReferenceWorker(fileName, function (fileName) { return findSourceFile(fileName, toPath(fileName), isDefaultLib, ignoreNoDefaultLib, refFile, refPos, refEnd, packageId); }, // TODO: GH#18217
+            function (diagnostic) {
                 var args = [];
                 for (var _i = 1; _i < arguments.length; _i++) {
                     args[_i - 1] = arguments[_i];
@@ -66124,21 +82248,28 @@ var ts;
             });
             return redirect;
         }
-        function findSourceFile(fileName, path, isDefaultLib, refFile, refPos, refEnd, packageId) {
+        // Get source file from normalized fileName
+        function findSourceFile(fileName, path, isDefaultLib, ignoreNoDefaultLib, refFile, refPos, refEnd, packageId) {
             if (filesByName.has(path)) {
                 var file_1 = filesByName.get(path);
+                // try to check if we've already seen this file but with a different casing in path
+                // NOTE: this only makes sense for case-insensitive file systems
                 if (file_1 && options.forceConsistentCasingInFileNames && ts.getNormalizedAbsolutePath(file_1.fileName, currentDirectory) !== ts.getNormalizedAbsolutePath(fileName, currentDirectory)) {
                     reportFileNamesDifferOnlyInCasingError(fileName, file_1.fileName, refFile, refPos, refEnd);
                 }
+                // If the file was previously found via a node_modules search, but is now being processed as a root file,
+                // then everything it sucks in may also be marked incorrectly, and needs to be checked again.
                 if (file_1 && sourceFilesFoundSearchingNodeModules.get(file_1.path) && currentNodeModulesDepth === 0) {
                     sourceFilesFoundSearchingNodeModules.set(file_1.path, false);
                     if (!options.noResolve) {
                         processReferencedFiles(file_1, isDefaultLib);
                         processTypeReferenceDirectives(file_1);
                     }
+                    processLibReferenceDirectives(file_1);
                     modulesWithElidedImports.set(file_1.path, false);
                     processImportedModules(file_1);
                 }
+                // See if we need to reprocess the imports due to prior skipped imports
                 else if (file_1 && modulesWithElidedImports.get(file_1.path)) {
                     if (currentNodeModulesDepth < maxNodeModuleJsDepth) {
                         modulesWithElidedImports.set(file_1.path, false);
@@ -66153,9 +82284,15 @@ var ts;
                 if (redirect) {
                     (refFile.redirectedReferences || (refFile.redirectedReferences = [])).push(fileName);
                     fileName = redirect;
+                    // Once we start redirecting to a file, we can potentially come back to it
+                    // via a back-reference from another file in the .d.ts folder. If that happens we'll
+                    // end up trying to add it to the program *again* because we were tracking it via its
+                    // original (un-redirected) name. So we have to map both the original path and the redirected path
+                    // to the source file we're about to find/create
                     redirectedPath = toPath(redirect);
                 }
             }
+            // We haven't looked for this file, do so now and cache result
             var file = host.getSourceFile(fileName, options.target, function (hostErrorMessage) {
                 if (refFile !== undefined && refPos !== undefined && refEnd !== undefined) {
                     fileProcessingDiagnostics.add(ts.createFileDiagnostic(refFile, refPos, refEnd - refPos, ts.Diagnostics.Cannot_read_file_0_Colon_1, fileName, hostErrorMessage));
@@ -66168,14 +82305,17 @@ var ts;
                 var packageIdKey = ts.packageIdToString(packageId);
                 var fileFromPackageId = packageIdToSourceFile.get(packageIdKey);
                 if (fileFromPackageId) {
-                    var dupFile = createRedirectSourceFile(fileFromPackageId, file, fileName, path);
+                    // Some other SourceFile already exists with this package name and version.
+                    // Instead of creating a duplicate, just redirect to the existing one.
+                    var dupFile = createRedirectSourceFile(fileFromPackageId, file, fileName, path); // TODO: GH#18217
                     redirectTargetsSet.set(fileFromPackageId.path, true);
                     filesByName.set(path, dupFile);
                     sourceFileToPackageName.set(path, packageId.name);
-                    files.push(dupFile);
+                    processingOtherFiles.push(dupFile);
                     return dupFile;
                 }
                 else if (file) {
+                    // This is the first source file to have this packageId.
                     packageIdToSourceFile.set(packageIdKey, file);
                     sourceFileToPackageName.set(path, packageId.name);
                 }
@@ -66187,8 +82327,10 @@ var ts;
             if (file) {
                 sourceFilesFoundSearchingNodeModules.set(path, currentNodeModulesDepth > 0);
                 file.path = path;
+                file.resolvedPath = toPath(fileName);
                 if (host.useCaseSensitiveFileNames()) {
                     var pathLowerCase = path.toLowerCase();
+                    // for case-sensitive file systems check if we've already seen some file with similar filename ignoring case
                     var existingFile = filesByNameIgnoreCase.get(pathLowerCase);
                     if (existingFile) {
                         reportFileNamesDifferOnlyInCasingError(fileName, existingFile.fileName, refFile, refPos, refEnd);
@@ -66197,23 +82339,27 @@ var ts;
                         filesByNameIgnoreCase.set(pathLowerCase, file);
                     }
                 }
-                skipDefaultLib = skipDefaultLib || file.hasNoDefaultLib;
+                skipDefaultLib = skipDefaultLib || (file.hasNoDefaultLib && !ignoreNoDefaultLib);
                 if (!options.noResolve) {
                     processReferencedFiles(file, isDefaultLib);
                     processTypeReferenceDirectives(file);
                 }
+                processLibReferenceDirectives(file);
+                // always process imported modules to record module name resolutions
                 processImportedModules(file);
                 if (isDefaultLib) {
-                    files.unshift(file);
+                    processingDefaultLibFiles.push(file);
                 }
                 else {
-                    files.push(file);
+                    processingOtherFiles.push(file);
                 }
             }
             return file;
         }
         function getProjectReferenceRedirect(fileName) {
             var path = toPath(fileName);
+            // If this file is produced by a referenced project, we need to rewrite it to
+            // look in the output folder of the referenced project rather than the input
             var normalized = ts.getNormalizedAbsolutePath(fileName, path);
             var result;
             projectReferenceRedirects.forEach(function (v, k) {
@@ -66229,10 +82375,11 @@ var ts;
         function processReferencedFiles(file, isDefaultLib) {
             ts.forEach(file.referencedFiles, function (ref) {
                 var referencedFileName = resolveTripleslashReference(ref.fileName, file.fileName);
-                processSourceFile(referencedFileName, isDefaultLib, undefined, file, ref.pos, ref.end);
+                processSourceFile(referencedFileName, isDefaultLib, /*ignoreNoDefaultLib*/ false, /*packageId*/ undefined, file, ref.pos, ref.end);
             });
         }
         function processTypeReferenceDirectives(file) {
+            // We lower-case all type references because npm automatically lowercases all packages. See GH#9824.
             var typeDirectives = ts.map(file.typeReferenceDirectives, function (ref) { return ref.fileName.toLocaleLowerCase(); });
             if (!typeDirectives) {
                 return;
@@ -66241,12 +82388,14 @@ var ts;
             for (var i = 0; i < typeDirectives.length; i++) {
                 var ref = file.typeReferenceDirectives[i];
                 var resolvedTypeReferenceDirective = resolutions[i];
+                // store resolved type directive on the file
                 var fileName = ref.fileName.toLocaleLowerCase();
                 ts.setResolvedTypeReferenceDirective(file, fileName, resolvedTypeReferenceDirective);
                 processTypeReferenceDirective(fileName, resolvedTypeReferenceDirective, file, ref.pos, ref.end);
             }
         }
         function processTypeReferenceDirective(typeReferenceDirective, resolvedTypeReferenceDirective, refFile, refPos, refEnd) {
+            // If we already found this library as a primary reference - nothing to do
             var previousResolution = resolvedTypeReferenceDirectives.get(typeReferenceDirective);
             if (previousResolution && previousResolution.primary) {
                 return;
@@ -66254,30 +82403,53 @@ var ts;
             var saveResolution = true;
             if (resolvedTypeReferenceDirective) {
                 if (resolvedTypeReferenceDirective.primary) {
-                    processSourceFile(resolvedTypeReferenceDirective.resolvedFileName, false, resolvedTypeReferenceDirective.packageId, refFile, refPos, refEnd);
+                    // resolved from the primary path
+                    processSourceFile(resolvedTypeReferenceDirective.resolvedFileName, /*isDefaultLib*/ false, /*ignoreNoDefaultLib*/ false, resolvedTypeReferenceDirective.packageId, refFile, refPos, refEnd); // TODO: GH#18217
                 }
                 else {
+                    // If we already resolved to this file, it must have been a secondary reference. Check file contents
+                    // for sameness and possibly issue an error
                     if (previousResolution) {
+                        // Don't bother reading the file again if it's the same file.
                         if (resolvedTypeReferenceDirective.resolvedFileName !== previousResolution.resolvedFileName) {
                             var otherFileText = host.readFile(resolvedTypeReferenceDirective.resolvedFileName);
                             if (otherFileText !== getSourceFile(previousResolution.resolvedFileName).text) {
-                                fileProcessingDiagnostics.add(createDiagnostic(refFile, refPos, refEnd, ts.Diagnostics.Conflicting_definitions_for_0_found_at_1_and_2_Consider_installing_a_specific_version_of_this_library_to_resolve_the_conflict, typeReferenceDirective, resolvedTypeReferenceDirective.resolvedFileName, previousResolution.resolvedFileName));
+                                fileProcessingDiagnostics.add(createDiagnostic(refFile, refPos, refEnd, // TODO: GH#18217
+                                ts.Diagnostics.Conflicting_definitions_for_0_found_at_1_and_2_Consider_installing_a_specific_version_of_this_library_to_resolve_the_conflict, typeReferenceDirective, resolvedTypeReferenceDirective.resolvedFileName, previousResolution.resolvedFileName));
                             }
                         }
+                        // don't overwrite previous resolution result
                         saveResolution = false;
                     }
                     else {
-                        processSourceFile(resolvedTypeReferenceDirective.resolvedFileName, false, resolvedTypeReferenceDirective.packageId, refFile, refPos, refEnd);
+                        // First resolution of this library
+                        processSourceFile(resolvedTypeReferenceDirective.resolvedFileName, /*isDefaultLib*/ false, /*ignoreNoDefaultLib*/ false, resolvedTypeReferenceDirective.packageId, refFile, refPos, refEnd);
                     }
                 }
             }
             else {
-                fileProcessingDiagnostics.add(createDiagnostic(refFile, refPos, refEnd, ts.Diagnostics.Cannot_find_type_definition_file_for_0, typeReferenceDirective));
+                fileProcessingDiagnostics.add(createDiagnostic(refFile, refPos, refEnd, ts.Diagnostics.Cannot_find_type_definition_file_for_0, typeReferenceDirective)); // TODO: GH#18217
             }
             if (saveResolution) {
                 resolvedTypeReferenceDirectives.set(typeReferenceDirective, resolvedTypeReferenceDirective);
             }
         }
+        function processLibReferenceDirectives(file) {
+            ts.forEach(file.libReferenceDirectives, function (libReference) {
+                var libName = libReference.fileName.toLocaleLowerCase();
+                var libFileName = ts.libMap.get(libName);
+                if (libFileName) {
+                    // we ignore any 'no-default-lib' reference set on this file.
+                    processRootFile(ts.combinePaths(defaultLibraryPath, libFileName), /*isDefaultLib*/ true, /*ignoreNoDefaultLib*/ true);
+                }
+                else {
+                    var unqualifiedLibName = ts.removeSuffix(ts.removePrefix(libName, "lib."), ".d.ts");
+                    var suggestion = ts.getSpellingSuggestion(unqualifiedLibName, ts.libs, ts.identity);
+                    var message = suggestion ? ts.Diagnostics.Cannot_find_lib_definition_for_0_Did_you_mean_1 : ts.Diagnostics.Cannot_find_lib_definition_for_0;
+                    fileProcessingDiagnostics.add(createDiagnostic(file, libReference.pos, libReference.end, message, libName, suggestion));
+                }
+            });
+        }
         function createDiagnostic(refFile, refPos, refEnd, message) {
             var args = [];
             for (var _i = 4; _i < arguments.length; _i++) {
@@ -66296,6 +82468,7 @@ var ts;
         function processImportedModules(file) {
             collectExternalModuleReferences(file);
             if (file.imports.length || file.moduleAugmentations.length) {
+                // Because global augmentation doesn't have string literal name, we can check for global augmentation as such.
                 var moduleNames = getModuleNames(file);
                 var oldProgramState = { program: oldProgram, oldSourceFile: oldProgram && oldProgram.getSourceFile(file.fileName), modifiedFilePaths: modifiedFilePaths };
                 var resolutions = resolveModuleNamesReusingOldState(moduleNames, ts.getNormalizedAbsolutePath(file.fileName, currentDirectory), file, oldProgramState);
@@ -66313,21 +82486,28 @@ var ts;
                     if (isFromNodeModulesSearch) {
                         currentNodeModulesDepth++;
                     }
+                    // add file to program only if:
+                    // - resolution was successful
+                    // - noResolve is falsy
+                    // - module name comes from the list of imports
+                    // - it's not a top level JavaScript module that exceeded the search max
                     var elideImport = isJsFileFromNodeModules && currentNodeModulesDepth > maxNodeModuleJsDepth;
+                    // Don't add the file if it has a bad extension (e.g. 'tsx' if we don't have '--allowJs')
+                    // This may still end up being an untyped module -- the file won't be included but imports will be allowed.
                     var shouldAddFile = resolvedFileName
                         && !getResolutionDiagnostic(options, resolution)
                         && !options.noResolve
                         && i < file.imports.length
                         && !elideImport
                         && !(isJsFile && !options.allowJs)
-                        && (ts.isInJavaScriptFile(file.imports[i]) || !(file.imports[i].flags & 2097152));
+                        && (ts.isInJavaScriptFile(file.imports[i]) || !(file.imports[i].flags & 2097152 /* JSDoc */));
                     if (elideImport) {
                         modulesWithElidedImports.set(file.path, true);
                     }
                     else if (shouldAddFile) {
                         var path = toPath(resolvedFileName);
                         var pos = ts.skipTrivia(file.text, file.imports[i].pos);
-                        findSourceFile(resolvedFileName, path, false, file, pos, file.imports[i].end, resolution.packageId);
+                        findSourceFile(resolvedFileName, path, /*isDefaultLib*/ false, /*ignoreNoDefaultLib*/ false, file, pos, file.imports[i].end, resolution.packageId);
                     }
                     if (isFromNodeModulesSearch) {
                         currentNodeModulesDepth--;
@@ -66335,6 +82515,7 @@ var ts;
                 }
             }
             else {
+                // no imports - drop cached module resolutions
                 file.resolvedModules = undefined;
             }
         }
@@ -66366,23 +82547,25 @@ var ts;
             return allFilesBelongToPath;
         }
         function parseProjectReferenceConfigFile(ref) {
-            var refPath = resolveProjectReferencePath(host, ref);
+            // The actual filename (i.e. add "/tsconfig.json" if necessary)
+            var refPath = resolveProjectReferencePath(host, ref); // TODO: GH#18217
+            // An absolute path pointing to the containing directory of the config file
             var basePath = ts.getNormalizedAbsolutePath(ts.getDirectoryPath(refPath), host.getCurrentDirectory());
-            var sourceFile = host.getSourceFile(refPath, 100);
+            var sourceFile = host.getSourceFile(refPath, 100 /* JSON */);
             if (sourceFile === undefined) {
                 return undefined;
             }
-            var commandLine = ts.parseJsonSourceFileConfigFileContent(sourceFile, configParsingHost, basePath, undefined, refPath);
+            var commandLine = ts.parseJsonSourceFileConfigFileContent(sourceFile, configParsingHost, basePath, /*existingOptions*/ undefined, refPath);
             return { commandLine: commandLine, sourceFile: sourceFile };
         }
         function addProjectReferenceRedirects(referencedProject, target) {
-            var rootDir = ts.normalizePath(referencedProject.options.rootDir || ts.getDirectoryPath(referencedProject.options.configFilePath));
+            var rootDir = ts.normalizePath(referencedProject.options.rootDir || ts.getDirectoryPath(referencedProject.options.configFilePath)); // TODO: GH#18217
             target.set(rootDir, getDeclarationOutputDirectory(referencedProject));
         }
         function getDeclarationOutputDirectory(proj) {
             return proj.options.declarationDir ||
                 proj.options.outDir ||
-                ts.getDirectoryPath(proj.options.configFilePath);
+                ts.getDirectoryPath(proj.options.configFilePath); // TODO: GH#18217
         }
         function verifyCompilerOptions() {
             if (options.strictPropertyInitialization && !options.strictNullChecks) {
@@ -66441,17 +82624,18 @@ var ts;
                     }
                 }
             }
+            // List of collected files is complete; validate exhautiveness if this is a project with a file list
             if (options.composite && rootNames.length < files.length) {
                 var normalizedRootNames = rootNames.map(function (r) { return ts.normalizePath(r).toLowerCase(); });
                 var sourceFiles = files.filter(function (f) { return !f.isDeclarationFile; }).map(function (f) { return ts.normalizePath(f.path).toLowerCase(); });
-                var _loop_10 = function (file) {
+                var _loop_8 = function (file) {
                     if (normalizedRootNames.every(function (r) { return r !== file; })) {
                         programDiagnostics.add(ts.createCompilerDiagnostic(ts.Diagnostics.File_0_is_not_in_project_file_list_Projects_must_list_all_files_or_use_an_include_pattern, file));
                     }
                 };
                 for (var _i = 0, sourceFiles_4 = sourceFiles; _i < sourceFiles_4.length; _i++) {
                     var file = sourceFiles_4[_i];
-                    _loop_10(file);
+                    _loop_8(file);
                 }
             }
             if (options.paths) {
@@ -66460,12 +82644,12 @@ var ts;
                         continue;
                     }
                     if (!ts.hasZeroOrOneAsteriskCharacter(key)) {
-                        createDiagnosticForOptionPaths(true, key, ts.Diagnostics.Pattern_0_can_have_at_most_one_Asterisk_character, key);
+                        createDiagnosticForOptionPaths(/*onKey*/ true, key, ts.Diagnostics.Pattern_0_can_have_at_most_one_Asterisk_character, key);
                     }
                     if (ts.isArray(options.paths[key])) {
                         var len = options.paths[key].length;
                         if (len === 0) {
-                            createDiagnosticForOptionPaths(false, key, ts.Diagnostics.Substitutions_for_pattern_0_shouldn_t_be_an_empty_array, key);
+                            createDiagnosticForOptionPaths(/*onKey*/ false, key, ts.Diagnostics.Substitutions_for_pattern_0_shouldn_t_be_an_empty_array, key);
                         }
                         for (var i = 0; i < len; i++) {
                             var subst = options.paths[key][i];
@@ -66481,7 +82665,7 @@ var ts;
                         }
                     }
                     else {
-                        createDiagnosticForOptionPaths(false, key, ts.Diagnostics.Substitutions_for_pattern_0_should_be_an_array, key);
+                        createDiagnosticForOptionPaths(/*onKey*/ false, key, ts.Diagnostics.Substitutions_for_pattern_0_should_be_an_array, key);
                     }
                 }
             }
@@ -66497,6 +82681,7 @@ var ts;
                 createDiagnosticForOptionName(ts.Diagnostics.Option_0_cannot_be_specified_with_option_1, "out", "outFile");
             }
             if (options.mapRoot && !(options.sourceMap || options.declarationMap)) {
+                // Error to specify --mapRoot without --sourcemap
                 createDiagnosticForOptionName(ts.Diagnostics.Option_0_cannot_be_specified_without_specifying_option_1_or_option_2, "mapRoot", "sourceMap", "declarationMap");
             }
             if (options.declarationDir) {
@@ -66516,11 +82701,11 @@ var ts;
             if (options.noImplicitUseStrict && ts.getStrictOptionValue(options, "alwaysStrict")) {
                 createDiagnosticForOptionName(ts.Diagnostics.Option_0_cannot_be_specified_with_option_1, "noImplicitUseStrict", "alwaysStrict");
             }
-            var languageVersion = options.target || 0;
+            var languageVersion = options.target || 0 /* ES3 */;
             var outFile = options.outFile || options.out;
             var firstNonAmbientExternalModuleSourceFile = ts.forEach(files, function (f) { return ts.isExternalModule(f) && !f.isDeclarationFile ? f : undefined; });
             if (options.isolatedModules) {
-                if (options.module === ts.ModuleKind.None && languageVersion < 2) {
+                if (options.module === ts.ModuleKind.None && languageVersion < 2 /* ES2015 */) {
                     createDiagnosticForOptionName(ts.Diagnostics.Option_isolatedModules_can_only_be_used_when_either_option_module_is_provided_or_option_target_is_ES2015_or_higher, "isolatedModules", "target");
                 }
                 var firstNonExternalModuleSourceFile = ts.forEach(files, function (f) { return !ts.isExternalModule(f) && !f.isDeclarationFile ? f : undefined; });
@@ -66529,10 +82714,12 @@ var ts;
                     programDiagnostics.add(ts.createFileDiagnostic(firstNonExternalModuleSourceFile, span.start, span.length, ts.Diagnostics.Cannot_compile_namespaces_when_the_isolatedModules_flag_is_provided));
                 }
             }
-            else if (firstNonAmbientExternalModuleSourceFile && languageVersion < 2 && options.module === ts.ModuleKind.None) {
+            else if (firstNonAmbientExternalModuleSourceFile && languageVersion < 2 /* ES2015 */ && options.module === ts.ModuleKind.None) {
+                // We cannot use createDiagnosticFromNode because nodes do not have parents yet
                 var span = ts.getErrorSpanForNode(firstNonAmbientExternalModuleSourceFile, firstNonAmbientExternalModuleSourceFile.externalModuleIndicator);
                 programDiagnostics.add(ts.createFileDiagnostic(firstNonAmbientExternalModuleSourceFile, span.start, span.length, ts.Diagnostics.Cannot_use_imports_exports_or_module_augmentations_when_module_is_none));
             }
+            // Cannot specify module gen that isn't amd or system with --out
             if (outFile) {
                 if (options.module && !(options.module === ts.ModuleKind.AMD || options.module === ts.ModuleKind.System)) {
                     createDiagnosticForOptionName(ts.Diagnostics.Only_amd_and_system_modules_are_supported_alongside_0, options.out ? "out" : "outFile", "module");
@@ -66547,10 +82734,14 @@ var ts;
                     createDiagnosticForOptionName(ts.Diagnostics.Option_resolveJsonModule_cannot_be_specified_without_node_module_resolution_strategy, "resolveJsonModule");
                 }
             }
-            if (options.outDir ||
-                options.sourceRoot ||
-                options.mapRoot) {
+            // there has to be common source directory if user specified --outdir || --sourceRoot
+            // if user specified --mapRoot, there needs to be common source directory if there would be multiple files being emitted
+            if (options.outDir || // there is --outDir specified
+                options.sourceRoot || // there is --sourceRoot specified
+                options.mapRoot) { // there is --mapRoot specified
+                // Precalculate and cache the common source directory
                 var dir = getCommonSourceDirectory();
+                // If we failed to find a good common directory, but outDir is specified and at least one of our files is on a windows drive/URL/other resource, add a failure
                 if (options.outDir && dir === "" && ts.forEach(files, function (file) { return ts.getRootLength(file.fileName) > 1; })) {
                     createDiagnosticForOptionName(ts.Diagnostics.Cannot_find_the_common_subdirectory_path_for_the_input_files, "outDir");
                 }
@@ -66584,6 +82775,7 @@ var ts;
             else if (options.reactNamespace && !ts.isIdentifierText(options.reactNamespace, languageVersion)) {
                 createOptionValueDiagnostic("reactNamespace", ts.Diagnostics.Invalid_value_for_reactNamespace_0_is_not_a_valid_identifier, options.reactNamespace);
             }
+            // If the emit is enabled make sure that every output file is unique and not overwriting any of the input files
             if (!options.noEmit && !options.suppressOutputPathCheck) {
                 var emitHost = getEmitHost();
                 var emitFilesSeen_1 = ts.createMap();
@@ -66594,19 +82786,24 @@ var ts;
                     verifyEmitFilePath(emitFileNames.declarationFilePath, emitFilesSeen_1);
                 });
             }
+            // Verify that all the emit files are unique and don't overwrite input files
             function verifyEmitFilePath(emitFileName, emitFilesSeen) {
                 if (emitFileName) {
                     var emitFilePath = toPath(emitFileName);
+                    // Report error if the output overwrites input file
                     if (filesByName.has(emitFilePath)) {
                         var chain_2;
                         if (!options.configFilePath) {
-                            chain_2 = ts.chainDiagnosticMessages(undefined, ts.Diagnostics.Adding_a_tsconfig_json_file_will_help_organize_projects_that_contain_both_TypeScript_and_JavaScript_files_Learn_more_at_https_Colon_Slash_Slashaka_ms_Slashtsconfig);
+                            // The program is from either an inferred project or an external project
+                            chain_2 = ts.chainDiagnosticMessages(/*details*/ undefined, ts.Diagnostics.Adding_a_tsconfig_json_file_will_help_organize_projects_that_contain_both_TypeScript_and_JavaScript_files_Learn_more_at_https_Colon_Slash_Slashaka_ms_Slashtsconfig);
                         }
                         chain_2 = ts.chainDiagnosticMessages(chain_2, ts.Diagnostics.Cannot_write_file_0_because_it_would_overwrite_input_file, emitFileName);
                         blockEmittingOfFile(emitFileName, ts.createCompilerDiagnosticFromMessageChain(chain_2));
                     }
                     var emitFileKey = !host.useCaseSensitiveFileNames() ? emitFilePath.toLocaleLowerCase() : emitFilePath;
+                    // Report error if multiple files write into same file
                     if (emitFilesSeen.has(emitFileKey)) {
+                        // Already seen the same emit file - report error
                         blockEmittingOfFile(emitFileName, ts.createCompilerDiagnostic(ts.Diagnostics.Cannot_write_file_0_because_it_would_be_overwritten_by_multiple_input_files, emitFileName));
                     }
                     else {
@@ -66641,7 +82838,7 @@ var ts;
             for (var _i = 0, pathsSyntax_2 = pathsSyntax; _i < pathsSyntax_2.length; _i++) {
                 var pathProp = pathsSyntax_2[_i];
                 if (ts.isObjectLiteralExpression(pathProp.initializer) &&
-                    createOptionDiagnosticInObjectLiteralSyntax(pathProp.initializer, onKey, key, undefined, message, arg0)) {
+                    createOptionDiagnosticInObjectLiteralSyntax(pathProp.initializer, onKey, key, /*key2*/ undefined, message, arg0)) {
                     needCompilerDiagnostic = false;
                 }
             }
@@ -66660,10 +82857,10 @@ var ts;
             return getOptionsSyntaxByName("paths") || ts.emptyArray;
         }
         function createDiagnosticForOptionName(message, option1, option2, option3) {
-            createDiagnosticForOption(true, option1, option2, message, option1, option2, option3);
+            createDiagnosticForOption(/*onKey*/ true, option1, option2, message, option1, option2, option3);
         }
         function createOptionValueDiagnostic(option1, message, arg0) {
-            createDiagnosticForOption(false, option1, undefined, message, arg0);
+            createDiagnosticForOption(/*onKey*/ false, option1, /*option2*/ undefined, message, arg0);
         }
         function createDiagnosticForReference(index, message, arg0, arg1) {
             var referencesSyntax = getProjectReferencesSyntax();
@@ -66684,9 +82881,9 @@ var ts;
         }
         function getProjectReferencesSyntax() {
             if (_referencesArrayLiteralSyntax === undefined) {
-                _referencesArrayLiteralSyntax = null;
+                _referencesArrayLiteralSyntax = null; // tslint:disable-line:no-null-keyword
                 if (options.configFile) {
-                    var jsonObjectLiteral = ts.getTsConfigObjectLiteralExpression(options.configFile);
+                    var jsonObjectLiteral = ts.getTsConfigObjectLiteralExpression(options.configFile); // TODO: GH#18217
                     for (var _i = 0, _a = ts.getPropertyAssignment(jsonObjectLiteral, "references"); _i < _a.length; _i++) {
                         var prop = _a[_i];
                         if (ts.isArrayLiteralExpression(prop.initializer)) {
@@ -66700,7 +82897,7 @@ var ts;
         }
         function getCompilerOptionsObjectLiteralSyntax() {
             if (_compilerOptionsObjectLiteralSyntax === undefined) {
-                _compilerOptionsObjectLiteralSyntax = null;
+                _compilerOptionsObjectLiteralSyntax = null; // tslint:disable-line:no-null-keyword
                 var jsonObjectLiteral = ts.getTsConfigObjectLiteralExpression(options.configFile);
                 if (jsonObjectLiteral) {
                     for (var _i = 0, _a = ts.getPropertyAssignment(jsonObjectLiteral, "compilerOptions"); _i < _a.length; _i++) {
@@ -66724,10 +82921,11 @@ var ts;
         }
         function createOptionDiagnosticInArrayLiteralSyntax(arrayLiteral, index, message, arg0, arg1, arg2) {
             if (arrayLiteral.elements.length <= index) {
+                // Out-of-bounds
                 return false;
             }
             programDiagnostics.add(ts.createDiagnosticForNodeInSourceFile(options.configFile, arrayLiteral.elements[index], message, arg0, arg1, arg2));
-            return false;
+            return false; // TODO: GH#18217 This function always returns `false`!`
         }
         function blockEmittingOfFile(emitFileName, diag) {
             hasEmitBlockingDiagnostics.set(toPath(emitFileName), true);
@@ -66737,32 +82935,38 @@ var ts;
             if (options.noEmit) {
                 return false;
             }
+            // If this is source file, its not emitted file
             var filePath = toPath(file);
             if (getSourceFileByPath(filePath)) {
                 return false;
             }
+            // If options have --outFile or --out just check that
             var out = options.outFile || options.out;
             if (out) {
-                return isSameFile(filePath, out) || isSameFile(filePath, ts.removeFileExtension(out) + ".d.ts");
+                return isSameFile(filePath, out) || isSameFile(filePath, ts.removeFileExtension(out) + ".d.ts" /* Dts */);
             }
+            // If declarationDir is specified, return if its a file in that directory
             if (options.declarationDir && ts.containsPath(options.declarationDir, filePath, currentDirectory, !host.useCaseSensitiveFileNames())) {
                 return true;
             }
+            // If --outDir, check if file is in that directory
             if (options.outDir) {
                 return ts.containsPath(options.outDir, filePath, currentDirectory, !host.useCaseSensitiveFileNames());
             }
-            if (ts.fileExtensionIsOneOf(filePath, ts.supportedJavascriptExtensions) || ts.fileExtensionIs(filePath, ".d.ts")) {
+            if (ts.fileExtensionIsOneOf(filePath, ts.supportedJavascriptExtensions) || ts.fileExtensionIs(filePath, ".d.ts" /* Dts */)) {
+                // Otherwise just check if sourceFile with the name exists
                 var filePathWithoutExtension = ts.removeFileExtension(filePath);
-                return !!getSourceFileByPath((filePathWithoutExtension + ".ts")) ||
-                    !!getSourceFileByPath((filePathWithoutExtension + ".tsx"));
+                return !!getSourceFileByPath((filePathWithoutExtension + ".ts" /* Ts */)) ||
+                    !!getSourceFileByPath((filePathWithoutExtension + ".tsx" /* Tsx */));
             }
             return false;
         }
         function isSameFile(file1, file2) {
-            return ts.comparePaths(file1, file2, currentDirectory, !host.useCaseSensitiveFileNames()) === 0;
+            return ts.comparePaths(file1, file2, currentDirectory, !host.useCaseSensitiveFileNames()) === 0 /* EqualTo */;
         }
     }
     ts.createProgram = createProgram;
+    /* @internal */
     function parseConfigHostFromCompilerHost(host) {
         return {
             fileExists: function (f) { return host.fileExists(f); },
@@ -66774,24 +82978,35 @@ var ts;
         };
     }
     ts.parseConfigHostFromCompilerHost = parseConfigHostFromCompilerHost;
+    /**
+     * Returns the target config filename of a project reference
+     */
     function resolveProjectReferencePath(host, ref) {
         if (!host.fileExists(ref.path)) {
             return ts.combinePaths(ref.path, "tsconfig.json");
         }
         return ref.path;
     }
+    ts.resolveProjectReferencePath = resolveProjectReferencePath;
+    /* @internal */
+    /**
+     * Returns a DiagnosticMessage if we won't include a resolved module due to its extension.
+     * The DiagnosticMessage's parameters are the imported module name, and the filename it resolved to.
+     * This returns a diagnostic even if the module will be an untyped module.
+     */
     function getResolutionDiagnostic(options, _a) {
         var extension = _a.extension;
         switch (extension) {
-            case ".ts":
-            case ".d.ts":
-            case ".json":
+            case ".ts" /* Ts */:
+            case ".d.ts" /* Dts */:
+            case ".json" /* Json */: // Since module is resolved to json file only when --resolveJsonModule, we dont need further check
+                // These are always allowed.
                 return undefined;
-            case ".tsx":
+            case ".tsx" /* Tsx */:
                 return needJsx();
-            case ".jsx":
+            case ".jsx" /* Jsx */:
                 return needJsx() || needAllowJs();
-            case ".js":
+            case ".js" /* Js */:
                 return needAllowJs();
         }
         function needJsx() {
@@ -66807,13 +83022,15 @@ var ts;
         var res = imports.map(function (i) { return i.text; });
         for (var _i = 0, moduleAugmentations_1 = moduleAugmentations; _i < moduleAugmentations_1.length; _i++) {
             var aug = moduleAugmentations_1[_i];
-            if (aug.kind === 9) {
+            if (aug.kind === 9 /* StringLiteral */) {
                 res.push(aug.text);
             }
+            // Do nothing if it's an Identifier; we don't need to do module resolution for `declare global`.
         }
         return res;
     }
 })(ts || (ts = {}));
+/*@internal*/
 var ts;
 (function (ts) {
     function getFileEmitOutput(program, sourceFile, emitOnlyDtsFiles, cancellationToken, customTransformers) {
@@ -66826,11 +83043,18 @@ var ts;
     }
     ts.getFileEmitOutput = getFileEmitOutput;
 })(ts || (ts = {}));
+/*@internal*/
 (function (ts) {
     var BuilderState;
     (function (BuilderState) {
+        /**
+         * Gets the referenced files for a file from the program with values for the keys as referenced file's path to be true
+         */
         function getReferencedFiles(program, sourceFile, getCanonicalFileName) {
             var referencedFiles;
+            // We need to use a set here since the code can contain the same import twice,
+            // but that will only be one dependency.
+            // To avoid invernal conversion, the key of the referencedFiles map must be of type Path
             if (sourceFile.imports && sourceFile.imports.length > 0) {
                 var checker = program.getTypeChecker();
                 for (var _i = 0, _a = sourceFile.imports; _i < _a.length; _i++) {
@@ -66845,6 +83069,7 @@ var ts;
                 }
             }
             var sourceFileDirectory = ts.getDirectoryPath(sourceFile.path);
+            // Handle triple slash references
             if (sourceFile.referencedFiles && sourceFile.referencedFiles.length > 0) {
                 for (var _b = 0, _c = sourceFile.referencedFiles; _b < _c.length; _b++) {
                     var referencedFile = _c[_b];
@@ -66852,12 +83077,13 @@ var ts;
                     addReferencedFile(referencedPath);
                 }
             }
+            // Handle type reference directives
             if (sourceFile.resolvedTypeReferenceDirectiveNames) {
                 sourceFile.resolvedTypeReferenceDirectiveNames.forEach(function (resolvedTypeReferenceDirective) {
                     if (!resolvedTypeReferenceDirective) {
                         return;
                     }
-                    var fileName = resolvedTypeReferenceDirective.resolvedFileName;
+                    var fileName = resolvedTypeReferenceDirective.resolvedFileName; // TODO: GH#18217
                     var typeFilePath = ts.toPath(fileName, sourceFileDirectory, getCanonicalFileName);
                     addReferencedFile(typeFilePath);
                 });
@@ -66870,15 +83096,22 @@ var ts;
                 referencedFiles.set(referencedPath, true);
             }
         }
+        /**
+         * Returns true if oldState is reusable, that is the emitKind = module/non module has not changed
+         */
         function canReuseOldState(newReferencedMap, oldState) {
             return oldState && !oldState.referencedMap === !newReferencedMap;
         }
         BuilderState.canReuseOldState = canReuseOldState;
+        /**
+         * Creates the state of file references and signature for the new program from oldState if it is safe
+         */
         function create(newProgram, getCanonicalFileName, oldState) {
             var fileInfos = ts.createMap();
             var referencedMap = newProgram.getCompilerOptions().module !== ts.ModuleKind.None ? ts.createMap() : undefined;
             var hasCalledUpdateShapeSignature = ts.createMap();
             var useOldState = canReuseOldState(referencedMap, oldState);
+            // Create the reference map, and set the file infos
             for (var _i = 0, _a = newProgram.getSourceFiles(); _i < _a.length; _i++) {
                 var sourceFile = _a[_i];
                 var version_1 = sourceFile.version;
@@ -66900,7 +83133,14 @@ var ts;
             };
         }
         BuilderState.create = create;
+        /**
+         * Gets the files affected by the path from the program
+         */
         function getFilesAffectedBy(state, programOfThisState, path, cancellationToken, computeHash, cacheToUpdateSignature) {
+            // Since the operation could be cancelled, the signatures are always stored in the cache
+            // They will be commited once it is safe to use them
+            // eg when calling this api from tsserver, if there is no cancellation of the operation
+            // In the other cases the affected files signatures are commited only after the iteration through the result is complete
             var signatureCache = cacheToUpdateSignature || ts.createMap();
             var sourceFile = programOfThisState.getSourceFileByPath(path);
             if (!sourceFile) {
@@ -66911,11 +83151,16 @@ var ts;
             }
             var result = (state.referencedMap ? getFilesAffectedByUpdatedShapeWhenModuleEmit : getFilesAffectedByUpdatedShapeWhenNonModuleEmit)(state, programOfThisState, sourceFile, signatureCache, cancellationToken, computeHash);
             if (!cacheToUpdateSignature) {
+                // Commit all the signatures in the signature cache
                 updateSignaturesFromCache(state, signatureCache);
             }
             return result;
         }
         BuilderState.getFilesAffectedBy = getFilesAffectedBy;
+        /**
+         * Updates the signatures from the cache into state's fileinfo signatures
+         * This should be called whenever it is safe to commit the state of the builder
+         */
         function updateSignaturesFromCache(state, signatureCache) {
             signatureCache.forEach(function (signature, path) {
                 state.fileInfos.get(path).signature = signature;
@@ -66923,8 +83168,12 @@ var ts;
             });
         }
         BuilderState.updateSignaturesFromCache = updateSignaturesFromCache;
+        /**
+         * Returns if the shape of the signature has changed since last emit
+         */
         function updateShapeSignature(state, programOfThisState, sourceFile, cacheToUpdateSignature, cancellationToken, computeHash) {
             ts.Debug.assert(!!sourceFile);
+            // If we have cached the result for this file, that means hence forth we should assume file shape is uptodate
             if (state.hasCalledUpdateShapeSignature.has(sourceFile.path) || cacheToUpdateSignature.has(sourceFile.path)) {
                 return false;
             }
@@ -66937,26 +83186,32 @@ var ts;
                 latestSignature = sourceFile.version;
             }
             else {
-                var emitOutput = ts.getFileEmitOutput(programOfThisState, sourceFile, true, cancellationToken);
+                var emitOutput = ts.getFileEmitOutput(programOfThisState, sourceFile, /*emitOnlyDtsFiles*/ true, cancellationToken);
                 if (emitOutput.outputFiles && emitOutput.outputFiles.length > 0) {
                     latestSignature = computeHash(emitOutput.outputFiles[0].text);
                 }
                 else {
-                    latestSignature = prevSignature;
+                    latestSignature = prevSignature; // TODO: GH#18217
                 }
             }
             cacheToUpdateSignature.set(sourceFile.path, latestSignature);
             return !prevSignature || latestSignature !== prevSignature;
         }
+        /**
+         * Get all the dependencies of the sourceFile
+         */
         function getAllDependencies(state, programOfThisState, sourceFile) {
             var _a;
             var compilerOptions = programOfThisState.getCompilerOptions();
+            // With --out or --outFile all outputs go into single file, all files depend on each other
             if (compilerOptions.outFile || compilerOptions.out) {
                 return getAllFileNames(state, programOfThisState);
             }
+            // If this is non module emit, or its a global file, it depends on all the source files
             if (!state.referencedMap || (!ts.isExternalModule(sourceFile) && !containsOnlyAmbientModules(sourceFile))) {
                 return getAllFileNames(state, programOfThisState);
             }
+            // Get the references, traversing deep from the referenceMap
             var seenMap = ts.createMap();
             var queue = [sourceFile.path];
             while (queue.length) {
@@ -66978,6 +83233,9 @@ var ts;
             }));
         }
         BuilderState.getAllDependencies = getAllDependencies;
+        /**
+         * Gets the names of all files from the program
+         */
         function getAllFileNames(state, programOfThisState) {
             if (!state.allFileNames) {
                 var sourceFiles = programOfThisState.getSourceFiles();
@@ -66985,12 +83243,21 @@ var ts;
             }
             return state.allFileNames;
         }
+        /**
+         * Gets the files referenced by the the file path
+         */
         function getReferencedByPaths(state, referencedFilePath) {
             return ts.arrayFrom(ts.mapDefinedIterator(state.referencedMap.entries(), function (_a) {
                 var filePath = _a[0], referencesInFile = _a[1];
                 return referencesInFile.has(referencedFilePath) ? filePath : undefined;
             }));
         }
+        /**
+         * For script files that contains only ambient external modules, although they are not actually external module files,
+         * they can only be consumed via importing elements from them. Regular script files cannot consume them. Therefore,
+         * there are no point to rebuild all script files if these special files have changed. However, if any statement
+         * in the file is not ambient external module, we treat it as a regular script file.
+         */
         function containsOnlyAmbientModules(sourceFile) {
             for (var _i = 0, _a = sourceFile.statements; _i < _a.length; _i++) {
                 var statement = _a[_i];
@@ -67000,7 +83267,11 @@ var ts;
             }
             return true;
         }
+        /**
+         * Gets all files of the program excluding the default library file
+         */
         function getAllFilesExcludingDefaultLibraryFile(state, programOfThisState, firstSourceFile) {
+            // Use cached result
             if (state.allFilesExcludingDefaultLibraryFile) {
                 return state.allFilesExcludingDefaultLibraryFile;
             }
@@ -67020,13 +83291,21 @@ var ts;
                 }
             }
         }
+        /**
+         * When program emits non modular code, gets the files affected by the sourceFile whose shape has changed
+         */
         function getFilesAffectedByUpdatedShapeWhenNonModuleEmit(state, programOfThisState, sourceFileWithUpdatedShape) {
             var compilerOptions = programOfThisState.getCompilerOptions();
+            // If `--out` or `--outFile` is specified, any new emit will result in re-emitting the entire project,
+            // so returning the file itself is good enough.
             if (compilerOptions && (compilerOptions.out || compilerOptions.outFile)) {
                 return [sourceFileWithUpdatedShape];
             }
             return getAllFilesExcludingDefaultLibraryFile(state, programOfThisState, sourceFileWithUpdatedShape);
         }
+        /**
+         * When program emits modular code, gets the files affected by the sourceFile whose shape has changed
+         */
         function getFilesAffectedByUpdatedShapeWhenModuleEmit(state, programOfThisState, sourceFileWithUpdatedShape, cacheToUpdateSignature, cancellationToken, computeHash) {
             if (!ts.isExternalModule(sourceFileWithUpdatedShape) && !containsOnlyAmbientModules(sourceFileWithUpdatedShape)) {
                 return getAllFilesExcludingDefaultLibraryFile(state, programOfThisState, sourceFileWithUpdatedShape);
@@ -67035,7 +83314,11 @@ var ts;
             if (compilerOptions && (compilerOptions.isolatedModules || compilerOptions.out || compilerOptions.outFile)) {
                 return [sourceFileWithUpdatedShape];
             }
+            // Now we need to if each file in the referencedBy list has a shape change as well.
+            // Because if so, its own referencedBy files need to be saved as well to make the
+            // emitting result consistent with files on disk.
             var seenFileNamesMap = ts.createMap();
+            // Start with the paths this file was referenced by
             seenFileNamesMap.set(sourceFileWithUpdatedShape.path, sourceFileWithUpdatedShape);
             var queue = getReferencedByPaths(state, sourceFileWithUpdatedShape.path);
             while (queue.length > 0) {
@@ -67043,20 +83326,28 @@ var ts;
                 if (!seenFileNamesMap.has(currentPath)) {
                     var currentSourceFile = programOfThisState.getSourceFileByPath(currentPath);
                     seenFileNamesMap.set(currentPath, currentSourceFile);
-                    if (currentSourceFile && updateShapeSignature(state, programOfThisState, currentSourceFile, cacheToUpdateSignature, cancellationToken, computeHash)) {
-                        queue.push.apply(queue, getReferencedByPaths(state, currentPath));
+                    if (currentSourceFile && updateShapeSignature(state, programOfThisState, currentSourceFile, cacheToUpdateSignature, cancellationToken, computeHash)) { // TODO: GH#18217
+                        queue.push.apply(// TODO: GH#18217
+                        queue, getReferencedByPaths(state, currentPath));
                     }
                 }
             }
+            // Return array of values that needs emit
+            // Return array of values that needs emit
             return ts.arrayFrom(ts.mapDefinedIterator(seenFileNamesMap.values(), function (value) { return value; }));
         }
     })(BuilderState = ts.BuilderState || (ts.BuilderState = {}));
 })(ts || (ts = {}));
+/*@internal*/
 var ts;
 (function (ts) {
     function hasSameKeys(map1, map2) {
+        // Has same size and every key is present in both maps
         return map1 === map2 || map1 !== undefined && map2 !== undefined && map1.size === map2.size && !ts.forEachKey(map1, function (key) { return !map2.has(key); });
     }
+    /**
+     * Create the state so that we can iterate on changedFiles/affected files
+     */
     function createBuilderProgramState(newProgram, getCanonicalFileName, oldState) {
         var state = ts.BuilderState.create(newProgram, getCanonicalFileName, oldState);
         state.program = newProgram;
@@ -67068,27 +83359,37 @@ var ts;
         var useOldState = ts.BuilderState.canReuseOldState(state.referencedMap, oldState);
         var canCopySemanticDiagnostics = useOldState && oldState.semanticDiagnosticsPerFile && !!state.semanticDiagnosticsPerFile;
         if (useOldState) {
+            // Verify the sanity of old state
             if (!oldState.currentChangedFilePath) {
                 ts.Debug.assert(!oldState.affectedFiles && (!oldState.currentAffectedFilesSignatures || !oldState.currentAffectedFilesSignatures.size), "Cannot reuse if only few affected files of currentChangedFile were iterated");
             }
             if (canCopySemanticDiagnostics) {
                 ts.Debug.assert(!ts.forEachKey(oldState.changedFilesSet, function (path) { return oldState.semanticDiagnosticsPerFile.has(path); }), "Semantic diagnostics shouldnt be available for changed files");
             }
+            // Copy old state's changed files set
             ts.copyEntries(oldState.changedFilesSet, state.changedFilesSet);
         }
+        // Update changed files and copy semantic diagnostics if we can
         var referencedMap = state.referencedMap;
         var oldReferencedMap = useOldState ? oldState.referencedMap : undefined;
         state.fileInfos.forEach(function (info, sourceFilePath) {
             var oldInfo;
             var newReferences;
+            // if not using old state, every file is changed
             if (!useOldState ||
+                // File wasnt present in old state
                 !(oldInfo = oldState.fileInfos.get(sourceFilePath)) ||
+                // versions dont match
                 oldInfo.version !== info.version ||
+                // Referenced files changed
                 !hasSameKeys(newReferences = referencedMap && referencedMap.get(sourceFilePath), oldReferencedMap && oldReferencedMap.get(sourceFilePath)) ||
+                // Referenced file was deleted in the new program
                 newReferences && ts.forEachKey(newReferences, function (path) { return !state.fileInfos.has(path) && oldState.fileInfos.has(path); })) {
+                // Register file as changed file and do not copy semantic diagnostics, since all changed files need to be re-evaluated
                 state.changedFilesSet.set(sourceFilePath, true);
             }
             else if (canCopySemanticDiagnostics) {
+                // Unchanged file copy diagnostics
                 var diagnostics = oldState.semanticDiagnosticsPerFile.get(sourceFilePath);
                 if (diagnostics) {
                     state.semanticDiagnosticsPerFile.set(sourceFilePath, diagnostics);
@@ -67097,18 +83398,28 @@ var ts;
         });
         return state;
     }
+    /**
+     * Verifies that source file is ok to be used in calls that arent handled by next
+     */
     function assertSourceFileOkWithoutNextAffectedCall(state, sourceFile) {
         ts.Debug.assert(!sourceFile || !state.affectedFiles || state.affectedFiles[state.affectedFilesIndex - 1] !== sourceFile || !state.semanticDiagnosticsPerFile.has(sourceFile.path));
     }
+    /**
+     * This function returns the next affected file to be processed.
+     * Note that until doneAffected is called it would keep reporting same result
+     * This is to allow the callers to be able to actually remove affected file only when the operation is complete
+     * eg. if during diagnostics check cancellation token ends up cancelling the request, the affected file should be retained
+     */
     function getNextAffectedFile(state, cancellationToken, computeHash) {
         while (true) {
             var affectedFiles = state.affectedFiles;
             if (affectedFiles) {
                 var seenAffectedFiles = state.seenAffectedFiles, semanticDiagnosticsPerFile = state.semanticDiagnosticsPerFile;
-                var affectedFilesIndex = state.affectedFilesIndex;
+                var affectedFilesIndex = state.affectedFilesIndex; // TODO: GH#18217
                 while (affectedFilesIndex < affectedFiles.length) {
                     var affectedFile = affectedFiles[affectedFilesIndex];
                     if (!seenAffectedFiles.has(affectedFile.path)) {
+                        // Set the next affected file as seen and remove the cached semantic diagnostics
                         state.affectedFilesIndex = affectedFilesIndex;
                         semanticDiagnosticsPerFile.delete(affectedFile.path);
                         return affectedFile;
@@ -67116,21 +83427,28 @@ var ts;
                     seenAffectedFiles.set(affectedFile.path, true);
                     affectedFilesIndex++;
                 }
+                // Remove the changed file from the change set
                 state.changedFilesSet.delete(state.currentChangedFilePath);
                 state.currentChangedFilePath = undefined;
+                // Commit the changes in file signature
                 ts.BuilderState.updateSignaturesFromCache(state, state.currentAffectedFilesSignatures);
                 state.currentAffectedFilesSignatures.clear();
                 state.affectedFiles = undefined;
             }
+            // Get next changed file
             var nextKey = state.changedFilesSet.keys().next();
             if (nextKey.done) {
+                // Done
                 return undefined;
             }
+            // With --out or --outFile all outputs go into single file
+            // so operations are performed directly on program, return program
             var compilerOptions = state.program.getCompilerOptions();
             if (compilerOptions.outFile || compilerOptions.out) {
                 ts.Debug.assert(!state.semanticDiagnosticsPerFile);
                 return state.program;
             }
+            // Get next batch of affected files
             state.currentAffectedFilesSignatures = state.currentAffectedFilesSignatures || ts.createMap();
             state.affectedFiles = ts.BuilderState.getFilesAffectedBy(state, state.program, nextKey.value, cancellationToken, computeHash, state.currentAffectedFilesSignatures);
             state.currentChangedFilePath = nextKey.value;
@@ -67139,6 +83457,10 @@ var ts;
             state.seenAffectedFiles = state.seenAffectedFiles || ts.createMap();
         }
     }
+    /**
+     * This is called after completing operation on the next affected file.
+     * The operations here are postponed to ensure that cancellation during the iteration is handled correctly
+     */
     function doneWithAffectedFile(state, affected) {
         if (affected === state.program) {
             state.changedFilesSet.clear();
@@ -67148,16 +83470,25 @@ var ts;
             state.affectedFilesIndex++;
         }
     }
+    /**
+     * Returns the result with affected file
+     */
     function toAffectedFileResult(state, result, affected) {
         doneWithAffectedFile(state, affected);
         return { result: result, affected: affected };
     }
+    /**
+     * Gets the semantic diagnostics either from cache if present, or otherwise from program and caches it
+     * Note that it is assumed that the when asked about semantic diagnostics, the file has been taken out of affected files/changed file set
+     */
     function getSemanticDiagnosticsOfFile(state, sourceFile, cancellationToken) {
         var path = sourceFile.path;
         var cachedDiagnostics = state.semanticDiagnosticsPerFile.get(path);
+        // Report the semantic diagnostics from the cache if we already have those diagnostics present
         if (cachedDiagnostics) {
             return cachedDiagnostics;
         }
+        // Diagnostics werent cached, get them from program, and cache the result
         var diagnostics = state.program.getSemanticDiagnostics(sourceFile, cancellationToken);
         state.semanticDiagnosticsPerFile.set(path, diagnostics);
         return diagnostics;
@@ -67194,16 +83525,24 @@ var ts;
     ts.getBuilderCreationParameters = getBuilderCreationParameters;
     function createBuilderProgram(kind, _a) {
         var newProgram = _a.newProgram, host = _a.host, oldProgram = _a.oldProgram, configFileParsingDiagnostics = _a.configFileParsingDiagnostics;
+        // Return same program if underlying program doesnt change
         var oldState = oldProgram && oldProgram.getState();
         if (oldState && newProgram === oldState.program && configFileParsingDiagnostics === newProgram.getConfigFileParsingDiagnostics()) {
-            newProgram = undefined;
+            newProgram = undefined; // TODO: GH#18217
             oldState = undefined;
             return oldProgram;
         }
+        /**
+         * Create the canonical file name for identity
+         */
         var getCanonicalFileName = ts.createGetCanonicalFileName(host.useCaseSensitiveFileNames());
+        /**
+         * Computing hash to for signature verification
+         */
         var computeHash = host.createHash || ts.identity;
         var state = createBuilderProgramState(newProgram, getCanonicalFileName, oldState);
-        newProgram = undefined;
+        // To ensure that we arent storing any references to old program or new program without state
+        newProgram = undefined; // TODO: GH#18217
         oldProgram = undefined;
         oldState = undefined;
         var result = {
@@ -67231,17 +83570,38 @@ var ts;
             ts.notImplemented();
         }
         return result;
+        /**
+         * Emits the next affected file's emit result (EmitResult and sourceFiles emitted) or returns undefined if iteration is complete
+         * The first of writeFile if provided, writeFile of BuilderProgramHost if provided, writeFile of compiler host
+         * in that order would be used to write the files
+         */
         function emitNextAffectedFile(writeFile, cancellationToken, emitOnlyDtsFiles, customTransformers) {
             var affected = getNextAffectedFile(state, cancellationToken, computeHash);
             if (!affected) {
+                // Done
                 return undefined;
             }
-            return toAffectedFileResult(state, state.program.emit(affected === state.program ? undefined : affected, writeFile || host.writeFile, cancellationToken, emitOnlyDtsFiles, customTransformers), affected);
+            return toAffectedFileResult(state, 
+            // When whole program is affected, do emit only once (eg when --out or --outFile is specified)
+            // Otherwise just affected file
+            state.program.emit(affected === state.program ? undefined : affected, writeFile || host.writeFile, cancellationToken, emitOnlyDtsFiles, customTransformers), affected);
         }
+        /**
+         * Emits the JavaScript and declaration files.
+         * When targetSource file is specified, emits the files corresponding to that source file,
+         * otherwise for the whole program.
+         * In case of EmitAndSemanticDiagnosticsBuilderProgram, when targetSourceFile is specified,
+         * it is assumed that that file is handled from affected file list. If targetSourceFile is not specified,
+         * it will only emit all the affected files instead of whole program
+         *
+         * The first of writeFile if provided, writeFile of BuilderProgramHost if provided, writeFile of compiler host
+         * in that order would be used to write the files
+         */
         function emit(targetSourceFile, writeFile, cancellationToken, emitOnlyDtsFiles, customTransformers) {
             if (kind === BuilderProgramKind.EmitAndSemanticDiagnosticsBuilderProgram) {
                 assertSourceFileOkWithoutNextAffectedCall(state, targetSourceFile);
                 if (!targetSourceFile) {
+                    // Emit and report any errors we ran into.
                     var sourceMaps = [];
                     var emitSkipped = false;
                     var diagnostics = void 0;
@@ -67263,33 +83623,52 @@ var ts;
             }
             return state.program.emit(targetSourceFile, writeFile || host.writeFile, cancellationToken, emitOnlyDtsFiles, customTransformers);
         }
+        /**
+         * Return the semantic diagnostics for the next affected file or undefined if iteration is complete
+         * If provided ignoreSourceFile would be called before getting the diagnostics and would ignore the sourceFile if the returned value was true
+         */
         function getSemanticDiagnosticsOfNextAffectedFile(cancellationToken, ignoreSourceFile) {
             while (true) {
                 var affected = getNextAffectedFile(state, cancellationToken, computeHash);
                 if (!affected) {
+                    // Done
                     return undefined;
                 }
                 else if (affected === state.program) {
-                    return toAffectedFileResult(state, state.program.getSemanticDiagnostics(undefined, cancellationToken), affected);
+                    // When whole program is affected, get all semantic diagnostics (eg when --out or --outFile is specified)
+                    return toAffectedFileResult(state, state.program.getSemanticDiagnostics(/*targetSourceFile*/ undefined, cancellationToken), affected);
                 }
+                // Get diagnostics for the affected file if its not ignored
                 if (ignoreSourceFile && ignoreSourceFile(affected)) {
+                    // Get next affected file
                     doneWithAffectedFile(state, affected);
                     continue;
                 }
                 return toAffectedFileResult(state, getSemanticDiagnosticsOfFile(state, affected, cancellationToken), affected);
             }
         }
+        /**
+         * Gets the semantic diagnostics from the program corresponding to this state of file (if provided) or whole program
+         * The semantic diagnostics are cached and managed here
+         * Note that it is assumed that when asked about semantic diagnostics through this API,
+         * the file has been taken out of affected files so it is safe to use cache or get from program and cache the diagnostics
+         * In case of SemanticDiagnosticsBuilderProgram if the source file is not provided,
+         * it will iterate through all the affected files, to ensure that cache stays valid and yet provide a way to get all semantic diagnostics
+         */
         function getSemanticDiagnostics(sourceFile, cancellationToken) {
             assertSourceFileOkWithoutNextAffectedCall(state, sourceFile);
             var compilerOptions = state.program.getCompilerOptions();
             if (compilerOptions.outFile || compilerOptions.out) {
                 ts.Debug.assert(!state.semanticDiagnosticsPerFile);
+                // We dont need to cache the diagnostics just return them from program
                 return state.program.getSemanticDiagnostics(sourceFile, cancellationToken);
             }
             if (sourceFile) {
                 return getSemanticDiagnosticsOfFile(state, sourceFile, cancellationToken);
             }
             if (kind === BuilderProgramKind.SemanticDiagnosticsBuilderProgram) {
+                // When semantic builder asks for diagnostics of the whole program,
+                // ensure that all the affected files are handled
                 var affected = void 0;
                 while (affected = getNextAffectedFile(state, cancellationToken, computeHash)) {
                     doneWithAffectedFile(state, affected);
@@ -67317,6 +83696,7 @@ var ts;
     function createAbstractBuilder(newProgramOrRootNames, hostOrOptions, oldProgramOrHost, configFileParsingDiagnosticsOrOldProgram, configFileParsingDiagnostics) {
         var program = ts.getBuilderCreationParameters(newProgramOrRootNames, hostOrOptions, oldProgramOrHost, configFileParsingDiagnosticsOrOldProgram, configFileParsingDiagnostics).newProgram;
         return {
+            // Only return program, all other methods are not implemented
             getProgram: function () { return program; },
             getState: ts.notImplemented,
             getCompilerOptions: ts.notImplemented,
@@ -67334,6 +83714,7 @@ var ts;
     }
     ts.createAbstractBuilder = createAbstractBuilder;
 })(ts || (ts = {}));
+/*@internal*/
 var ts;
 (function (ts) {
     ts.maxNumberOfFilesToIterateForInvalidation = 256;
@@ -67342,23 +83723,35 @@ var ts;
         var filesWithInvalidatedResolutions;
         var filesWithInvalidatedNonRelativeUnresolvedImports;
         var allFilesHaveInvalidatedResolution = false;
-        var getCurrentDirectory = ts.memoize(function () { return resolutionHost.getCurrentDirectory(); });
+        var getCurrentDirectory = ts.memoize(function () { return resolutionHost.getCurrentDirectory(); }); // TODO: GH#18217
         var cachedDirectoryStructureHost = resolutionHost.getCachedDirectoryStructureHost();
+        // The resolvedModuleNames and resolvedTypeReferenceDirectives are the cache of resolutions per file.
+        // The key in the map is source file's path.
+        // The values are Map of resolutions with key being name lookedup.
         var resolvedModuleNames = ts.createMap();
         var perDirectoryResolvedModuleNames = ts.createMap();
         var nonRelaticeModuleNameCache = ts.createMap();
         var moduleResolutionCache = ts.createModuleResolutionCacheWithMaps(perDirectoryResolvedModuleNames, nonRelaticeModuleNameCache, getCurrentDirectory(), resolutionHost.getCanonicalFileName);
         var resolvedTypeReferenceDirectives = ts.createMap();
         var perDirectoryResolvedTypeReferenceDirectives = ts.createMap();
-        var failedLookupDefaultExtensions = [".ts", ".tsx", ".js", ".jsx", ".json"];
+        /**
+         * These are the extensions that failed lookup files will have by default,
+         * any other extension of failed lookup will be store that path in custom failed lookup path
+         * This helps in not having to comb through all resolutions when files are added/removed
+         * Note that .d.ts file also has .d.ts extension hence will be part of default extensions
+         */
+        var failedLookupDefaultExtensions = [".ts" /* Ts */, ".tsx" /* Tsx */, ".js" /* Js */, ".jsx" /* Jsx */, ".json" /* Json */];
         var customFailedLookupPaths = ts.createMap();
         var directoryWatchesOfFailedLookups = ts.createMap();
         var rootDir = rootDirForResolution && ts.removeTrailingDirectorySeparator(ts.getNormalizedAbsolutePath(rootDirForResolution, getCurrentDirectory()));
-        var rootPath = (rootDir && resolutionHost.toPath(rootDir));
+        var rootPath = (rootDir && resolutionHost.toPath(rootDir)); // TODO: GH#18217
+        // TypeRoot watches for the types that get added as part of getAutomaticTypeDirectiveNames
         var typeRootsWatches = ts.createMap();
         return {
             startRecordingFilesWithChangedResolutions: startRecordingFilesWithChangedResolutions,
             finishRecordingFilesWithChangedResolutions: finishRecordingFilesWithChangedResolutions,
+            // perDirectoryResolvedModuleNames and perDirectoryResolvedTypeReferenceDirectives could be non empty if there was exception during program update
+            // (between startCachingPerDirectoryResolution and finishCachingPerDirectoryResolution)
             startCachingPerDirectoryResolution: clearPerDirectoryResolutions,
             finishCachingPerDirectoryResolution: finishCachingPerDirectoryResolution,
             resolveModuleNames: resolveModuleNames,
@@ -67391,6 +83784,8 @@ var ts;
             resolvedModuleNames.clear();
             resolvedTypeReferenceDirectives.clear();
             allFilesHaveInvalidatedResolution = false;
+            // perDirectoryResolvedModuleNames and perDirectoryResolvedTypeReferenceDirectives could be non empty if there was exception during program update
+            // (between startCachingPerDirectoryResolution and finishCachingPerDirectoryResolution)
             clearPerDirectoryResolutions();
         }
         function startRecordingFilesWithChangedResolutions() {
@@ -67405,11 +83800,13 @@ var ts;
             if (!filesWithInvalidatedNonRelativeUnresolvedImports) {
                 return false;
             }
+            // Invalidated if file has unresolved imports
             var value = filesWithInvalidatedNonRelativeUnresolvedImports.get(path);
             return !!value && !!value.length;
         }
         function createHasInvalidatedResolution(forceAllFilesAsInvalidated) {
             if (allFilesHaveInvalidatedResolution || forceAllFilesAsInvalidated) {
+                // Any file asked would have invalidated resolution
                 filesWithInvalidatedResolutions = undefined;
                 return ts.returnTrue;
             }
@@ -67436,16 +83833,21 @@ var ts;
         }
         function resolveModuleName(moduleName, containingFile, compilerOptions, host) {
             var primaryResult = ts.resolveModuleName(moduleName, containingFile, compilerOptions, host, moduleResolutionCache);
+            // return result immediately only if global cache support is not enabled or if it is .ts, .tsx or .d.ts
             if (!resolutionHost.getGlobalCache) {
                 return primaryResult;
             }
+            // otherwise try to load typings from @types
             var globalCache = resolutionHost.getGlobalCache();
             if (globalCache !== undefined && !ts.isExternalModuleNameRelative(moduleName) && !(primaryResult.resolvedModule && ts.extensionIsTypeScript(primaryResult.resolvedModule.extension))) {
+                // create different collection of failed lookup locations for second pass
+                // if it will fail and we've already found something during the first pass - we don't want to pollute its results
                 var _a = ts.loadModuleFromGlobalCache(moduleName, resolutionHost.projectName, compilerOptions, host, globalCache), resolvedModule = _a.resolvedModule, failedLookupLocations = _a.failedLookupLocations;
                 if (resolvedModule) {
                     return { resolvedModule: resolvedModule, failedLookupLocations: ts.addRange(primaryResult.failedLookupLocations, failedLookupLocations) };
                 }
             }
+            // Default return the result from the first pass
             return primaryResult;
         }
         function resolveNamesWithLocalCache(names, containingFile, cache, perDirectoryCache, loader, getResolutionWithResolvedFileName, reusedNames, logChanges) {
@@ -67464,8 +83866,10 @@ var ts;
             for (var _i = 0, names_2 = names; _i < names_2.length; _i++) {
                 var name = names_2[_i];
                 var resolution = resolutionsInFile.get(name);
+                // Resolution is valid if it is present and not invalidated
                 if (!seenNamesInFile.has(name) &&
                     allFilesHaveInvalidatedResolution || !resolution || resolution.isInvalidated ||
+                    // If the name is unresolved import that was invalidated, recalculate
                     (hasInvalidatedNonRelativeUnresolvedImport && !ts.isExternalModuleNameRelative(name) && !getResolutionWithResolvedFileName(resolution))) {
                     var existingResolution = resolution;
                     var resolutionInDirectory = perDirectoryResolution.get(name);
@@ -67483,13 +83887,15 @@ var ts;
                     }
                     if (logChanges && filesWithChangedSetOfUnresolvedImports && !resolutionIsEqualTo(existingResolution, resolution)) {
                         filesWithChangedSetOfUnresolvedImports.push(path);
+                        // reset log changes to avoid recording the same file multiple times
                         logChanges = false;
                     }
                 }
                 ts.Debug.assert(resolution !== undefined && !resolution.isInvalidated);
                 seenNamesInFile.set(name, true);
-                resolvedModules.push(getResolutionWithResolvedFileName(resolution));
+                resolvedModules.push(getResolutionWithResolvedFileName(resolution)); // TODO: GH#18217
             }
+            // Stop watching and remove the unused name
             resolutionsInFile.forEach(function (resolution, name) {
                 if (!seenNamesInFile.has(name) && !ts.contains(reusedNames, name)) {
                     stopWatchFailedLookupLocationOfResolution(resolution);
@@ -67516,7 +83922,8 @@ var ts;
             }
         }
         function resolveTypeReferenceDirectives(typeDirectiveNames, containingFile) {
-            return resolveNamesWithLocalCache(typeDirectiveNames, containingFile, resolvedTypeReferenceDirectives, perDirectoryResolvedTypeReferenceDirectives, ts.resolveTypeReferenceDirective, getResolvedTypeReferenceDirective, undefined, false);
+            return resolveNamesWithLocalCache(typeDirectiveNames, containingFile, resolvedTypeReferenceDirectives, perDirectoryResolvedTypeReferenceDirectives, ts.resolveTypeReferenceDirective, getResolvedTypeReferenceDirective, 
+            /*reusedNames*/ undefined, /*logChanges*/ false);
         }
         function resolveModuleNames(moduleNames, containingFile, reusedNames) {
             return resolveNamesWithLocalCache(moduleNames, containingFile, resolvedModuleNames, perDirectoryResolvedModuleNames, resolveModuleName, getResolvedModule, reusedNames, logChangesWhenResolvingModule);
@@ -67531,18 +83938,37 @@ var ts;
         function isNodeModulesAtTypesDirectory(dirPath) {
             return ts.endsWith(dirPath, "/node_modules/@types");
         }
-        function isDirectoryAtleastAtLevelFromFSRoot(dirPath, minLevels) {
-            for (var searchIndex = ts.getRootLength(dirPath); minLevels > 0; minLevels--) {
+        /**
+         * Filter out paths like
+         * "/", "/user", "/user/username", "/user/username/folderAtRoot",
+         * "c:/", "c:/users", "c:/users/username", "c:/users/username/folderAtRoot", "c:/folderAtRoot"
+         * @param dirPath
+         */
+        function canWatchDirectory(dirPath) {
+            var rootLength = ts.getRootLength(dirPath);
+            if (dirPath.length === rootLength) {
+                // Ignore "/", "c:/"
+                return false;
+            }
+            var nextDirectorySeparator = dirPath.indexOf(ts.directorySeparator, rootLength);
+            if (nextDirectorySeparator === -1) {
+                // ignore "/user", "c:/users" or "c:/folderAtRoot"
+                return false;
+            }
+            if (dirPath.charCodeAt(0) !== 47 /* slash */ &&
+                dirPath.substr(rootLength, nextDirectorySeparator).search(/users/i) === -1) {
+                // Paths like c:/folderAtRoot/subFolder are allowed
+                return true;
+            }
+            for (var searchIndex = nextDirectorySeparator + 1, searchLevels = 2; searchLevels > 0; searchLevels--) {
                 searchIndex = dirPath.indexOf(ts.directorySeparator, searchIndex) + 1;
                 if (searchIndex === 0) {
+                    // Folder isnt at expected minimun levels
                     return false;
                 }
             }
             return true;
         }
-        function canWatchDirectory(dirPath) {
-            return isDirectoryAtleastAtLevelFromFSRoot(dirPath, dirPath.charCodeAt(0) === 47 ? 3 : 1);
-        }
         function filterFSRootDirectoriesToWatch(watchPath, dirPath) {
             if (!canWatchDirectory(dirPath)) {
                 watchPath.ignore = true;
@@ -67551,18 +83977,21 @@ var ts;
         }
         function getDirectoryToWatchFailedLookupLocation(failedLookupLocation, failedLookupLocationPath) {
             if (isInDirectoryPath(rootPath, failedLookupLocationPath)) {
-                return { dir: rootDir, dirPath: rootPath };
+                return { dir: rootDir, dirPath: rootPath }; // TODO: GH#18217
             }
             return getDirectoryToWatchFromFailedLookupLocationDirectory(ts.getDirectoryPath(ts.getNormalizedAbsolutePath(failedLookupLocation, getCurrentDirectory())), ts.getDirectoryPath(failedLookupLocationPath));
         }
         function getDirectoryToWatchFromFailedLookupLocationDirectory(dir, dirPath) {
+            // If directory path contains node module, get the most parent node_modules directory for watching
             while (ts.stringContains(dirPath, "/node_modules/")) {
                 dir = ts.getDirectoryPath(dir);
                 dirPath = ts.getDirectoryPath(dirPath);
             }
+            // If the directory is node_modules use it to watch
             if (isNodeModulesDirectory(dirPath)) {
                 return filterFSRootDirectoriesToWatch({ dir: dir, dirPath: dirPath }, ts.getDirectoryPath(dirPath));
             }
+            // Use some ancestor of the root directory
             var subDirectoryPath, subDirectory;
             if (rootPath !== undefined) {
                 while (!isInDirectoryPath(dirPath, rootPath)) {
@@ -67582,6 +84011,7 @@ var ts;
             return ts.fileExtensionIsOneOf(path, failedLookupDefaultExtensions);
         }
         function watchFailedLookupLocationOfResolution(resolution) {
+            // No need to set the resolution refCount
             if (!resolution.failedLookupLocations || !resolution.failedLookupLocations.length) {
                 return;
             }
@@ -67597,6 +84027,8 @@ var ts;
                 var failedLookupLocationPath = resolutionHost.toPath(failedLookupLocation);
                 var _a = getDirectoryToWatchFailedLookupLocation(failedLookupLocation, failedLookupLocationPath), dir = _a.dir, dirPath = _a.dirPath, ignore = _a.ignore;
                 if (!ignore) {
+                    // If the failed lookup location path is not one of the supported extensions,
+                    // store it in the custom path
                     if (!isPathWithDefaultFailedLookupExtension(failedLookupLocationPath)) {
                         var refCount = customFailedLookupPaths.get(failedLookupLocationPath) || 0;
                         customFailedLookupPaths.set(failedLookupLocationPath, refCount + 1);
@@ -67610,7 +84042,7 @@ var ts;
                 }
             }
             if (setAtRoot) {
-                setDirectoryWatcher(rootDir, rootPath);
+                setDirectoryWatcher(rootDir, rootPath); // TODO: GH#18217
             }
         }
         function setDirectoryWatcher(dir, dirPath) {
@@ -67661,20 +84093,23 @@ var ts;
         }
         function removeDirectoryWatcher(dirPath) {
             var dirWatcher = directoryWatchesOfFailedLookups.get(dirPath);
+            // Do not close the watcher yet since it might be needed by other failed lookup locations.
             dirWatcher.refCount--;
         }
         function createDirectoryWatcher(directory, dirPath) {
             return resolutionHost.watchDirectoryOfFailedLookupLocation(directory, function (fileOrDirectory) {
                 var fileOrDirectoryPath = resolutionHost.toPath(fileOrDirectory);
                 if (cachedDirectoryStructureHost) {
+                    // Since the file existence changed, update the sourceFiles cache
                     cachedDirectoryStructureHost.addOrDeleteFileOrDirectory(fileOrDirectory, fileOrDirectoryPath);
                 }
                 if (!allFilesHaveInvalidatedResolution && invalidateResolutionOfFailedLookupLocation(fileOrDirectoryPath, dirPath === fileOrDirectoryPath)) {
                     resolutionHost.onInvalidatedResolution();
                 }
-            }, 1);
+            }, 1 /* Recursive */);
         }
         function removeResolutionsOfFileFromCache(cache, filePath) {
+            // Deleted file, stop watching failed lookups for all the resolutions in the file
             var resolutions = cache.get(filePath);
             if (resolutions) {
                 resolutions.forEach(stopWatchFailedLookupLocationOfResolution);
@@ -67700,6 +84135,7 @@ var ts;
                     }
                     seenInDir.set(name, true);
                     if (!resolution.isInvalidated && isInvalidatedResolution(resolution, getResolutionWithResolvedFileName)) {
+                        // Mark the file as needing re-evaluation of module resolution instead of using it blindly.
                         resolution.isInvalidated = true;
                         (filesWithInvalidatedResolutions || (filesWithInvalidatedResolutions = ts.createMap())).set(containingFilePath, true);
                     }
@@ -67711,6 +84147,8 @@ var ts;
             return resolvedModuleNames.size > maxSize || resolvedTypeReferenceDirectives.size > maxSize;
         }
         function invalidateResolutions(isInvalidatedResolution) {
+            // If more than maxNumberOfFilesToIterateForInvalidation present,
+            // just invalidated all files and recalculate the resolutions for files instead
             if (hasReachedResolutionIterationLimit()) {
                 allFilesHaveInvalidatedResolution = true;
                 return;
@@ -67720,9 +84158,11 @@ var ts;
         }
         function invalidateResolutionOfFile(filePath) {
             removeResolutionsOfFile(filePath);
-            invalidateResolutions(function (resolution, getResolutionWithResolvedFileName) {
+            invalidateResolutions(
+            // Resolution is invalidated if the resulting file name is same as the deleted file path
+            function (resolution, getResolutionWithResolvedFileName) {
                 var result = getResolutionWithResolvedFileName(resolution);
-                return !!result && resolutionHost.toPath(result.resolvedFileName) === filePath;
+                return !!result && resolutionHost.toPath(result.resolvedFileName) === filePath; // TODO: GH#18217
             });
         }
         function setFilesWithInvalidatedNonRelativeUnresolvedImports(filesMap) {
@@ -67732,12 +84172,17 @@ var ts;
         function invalidateResolutionOfFailedLookupLocation(fileOrDirectoryPath, isCreatingWatchedDirectory) {
             var isChangedFailedLookupLocation;
             if (isCreatingWatchedDirectory) {
+                // Watching directory is created
+                // Invalidate any resolution has failed lookup in this directory
                 isChangedFailedLookupLocation = function (location) { return isInDirectoryPath(fileOrDirectoryPath, resolutionHost.toPath(location)); };
             }
             else {
+                // Some file or directory in the watching directory is created
+                // Return early if it does not have any of the watching extension or not the custom failed lookup path
                 var dirOfFileOrDirectory = ts.getDirectoryPath(fileOrDirectoryPath);
                 if (isNodeModulesAtTypesDirectory(fileOrDirectoryPath) || isNodeModulesDirectory(fileOrDirectoryPath) ||
                     isNodeModulesAtTypesDirectory(dirOfFileOrDirectory) || isNodeModulesDirectory(dirOfFileOrDirectory)) {
+                    // Invalidate any resolution from this directory
                     isChangedFailedLookupLocation = function (location) {
                         var locationPath = resolutionHost.toPath(location);
                         return locationPath === fileOrDirectoryPath || ts.startsWith(resolutionHost.toPath(location), fileOrDirectoryPath);
@@ -67747,15 +84192,19 @@ var ts;
                     if (!isPathWithDefaultFailedLookupExtension(fileOrDirectoryPath) && !customFailedLookupPaths.has(fileOrDirectoryPath)) {
                         return false;
                     }
+                    // Ignore emits from the program
                     if (ts.isEmittedFileOfProgram(resolutionHost.getCurrentProgram(), fileOrDirectoryPath)) {
                         return false;
                     }
+                    // Resolution need to be invalidated if failed lookup location is same as the file or directory getting created
                     isChangedFailedLookupLocation = function (location) { return resolutionHost.toPath(location) === fileOrDirectoryPath; };
                 }
             }
             var hasChangedFailedLookupLocation = function (resolution) { return ts.some(resolution.failedLookupLocations, isChangedFailedLookupLocation); };
             var invalidatedFilesCount = filesWithInvalidatedResolutions && filesWithInvalidatedResolutions.size;
-            invalidateResolutions(hasChangedFailedLookupLocation);
+            invalidateResolutions(
+            // Resolution is invalidated if the resulting file name is same as the deleted file path
+            hasChangedFailedLookupLocation);
             return allFilesHaveInvalidatedResolution || filesWithInvalidatedResolutions && filesWithInvalidatedResolutions.size !== invalidatedFilesCount;
         }
         function closeTypeRootsWatch() {
@@ -67772,24 +84221,39 @@ var ts;
             return !ignore && directoryWatchesOfFailedLookups.has(dirPath) ? dirPath : undefined;
         }
         function createTypeRootsWatch(typeRootPath, typeRoot) {
+            // Create new watch and recursive info
             return resolutionHost.watchTypeRootsDirectory(typeRoot, function (fileOrDirectory) {
                 var fileOrDirectoryPath = resolutionHost.toPath(fileOrDirectory);
                 if (cachedDirectoryStructureHost) {
+                    // Since the file existence changed, update the sourceFiles cache
                     cachedDirectoryStructureHost.addOrDeleteFileOrDirectory(fileOrDirectory, fileOrDirectoryPath);
                 }
+                // For now just recompile
+                // We could potentially store more data here about whether it was/would be really be used or not
+                // and with that determine to trigger compilation but for now this is enough
                 resolutionHost.onChangedAutomaticTypeDirectiveNames();
+                // Since directory watchers invoked are flaky, the failed lookup location events might not be triggered
+                // So handle to failed lookup locations here as well to ensure we are invalidating resolutions
                 var dirPath = getDirectoryToWatchFailedLookupLocationFromTypeRoot(typeRoot, typeRootPath);
                 if (dirPath && invalidateResolutionOfFailedLookupLocation(fileOrDirectoryPath, dirPath === fileOrDirectoryPath)) {
                     resolutionHost.onInvalidatedResolution();
                 }
-            }, 1);
+            }, 1 /* Recursive */);
         }
+        /**
+         * Watches the types that would get added as part of getAutomaticTypeDirectiveNames
+         * To be called when compiler options change
+         */
         function updateTypeRootsWatch() {
             var options = resolutionHost.getCompilationSettings();
             if (options.types) {
+                // No need to do any watch since resolution cache is going to handle the failed lookups
+                // for the types added by this
                 closeTypeRootsWatch();
                 return;
             }
+            // we need to assume the directories exist to ensure that we can get all the type root directories that get included
+            // But filter directories that are at root level to say directory doesnt exist, so that we arent watching them
             var typeRoots = ts.getEffectiveTypeRoots(options, { directoryExists: directoryExistsForTypeRootWatch, getCurrentDirectory: getCurrentDirectory });
             if (typeRoots) {
                 ts.mutateMap(typeRootsWatches, ts.arrayToMap(typeRoots, function (tr) { return resolutionHost.toPath(tr); }), {
@@ -67801,6 +84265,11 @@ var ts;
                 closeTypeRootsWatch();
             }
         }
+        /**
+         * Use this function to return if directory exists to get type roots to watch
+         * If we return directory exists then only the paths will be added to type roots
+         * Hence return true for all directories except root directories which are filtered from watching
+         */
         function directoryExistsForTypeRootWatch(nodeTypesDirectory) {
             var dir = ts.getDirectoryPath(ts.getDirectoryPath(nodeTypesDirectory));
             var dirPath = resolutionHost.toPath(dir);
@@ -67809,13 +84278,326 @@ var ts;
     }
     ts.createResolutionCache = createResolutionCache;
 })(ts || (ts = {}));
+// Used by importFixes to synthesize import module specifiers.
+/* @internal */
+var ts;
+(function (ts) {
+    var moduleSpecifiers;
+    (function (moduleSpecifiers) {
+        // Note: fromSourceFile is just for usesJsExtensionOnImports
+        function getModuleSpecifier(compilerOptions, fromSourceFile, fromSourceFileName, toFileName, host, preferences) {
+            if (preferences === void 0) { preferences = {}; }
+            var info = getInfo(compilerOptions, fromSourceFile, fromSourceFileName, host);
+            return getGlobalModuleSpecifier(toFileName, info, host, compilerOptions) ||
+                ts.first(getLocalModuleSpecifiers(toFileName, info, compilerOptions, preferences));
+        }
+        moduleSpecifiers.getModuleSpecifier = getModuleSpecifier;
+        // For each symlink/original for a module, returns a list of ways to import that file.
+        function getModuleSpecifiers(moduleSymbol, program, importingSourceFile, host, preferences) {
+            var ambient = tryGetModuleNameFromAmbientModule(moduleSymbol);
+            if (ambient)
+                return [[ambient]];
+            var compilerOptions = program.getCompilerOptions();
+            var info = getInfo(compilerOptions, importingSourceFile, importingSourceFile.fileName, host);
+            var modulePaths = getAllModulePaths(program, ts.getSourceFileOfNode(moduleSymbol.valueDeclaration));
+            var global = ts.mapDefined(modulePaths, function (moduleFileName) { return getGlobalModuleSpecifier(moduleFileName, info, host, compilerOptions); });
+            return global.length ? global.map(function (g) { return [g]; }) : modulePaths.map(function (moduleFileName) {
+                return getLocalModuleSpecifiers(moduleFileName, info, compilerOptions, preferences);
+            });
+        }
+        moduleSpecifiers.getModuleSpecifiers = getModuleSpecifiers;
+        // importingSourceFileName is separate because getEditsForFileRename may need to specify an updated path
+        function getInfo(compilerOptions, importingSourceFile, importingSourceFileName, host) {
+            var moduleResolutionKind = ts.getEmitModuleResolutionKind(compilerOptions);
+            var addJsExtension = usesJsExtensionOnImports(importingSourceFile);
+            var getCanonicalFileName = ts.createGetCanonicalFileName(host.useCaseSensitiveFileNames ? host.useCaseSensitiveFileNames() : true);
+            var sourceDirectory = ts.getDirectoryPath(importingSourceFileName);
+            return { moduleResolutionKind: moduleResolutionKind, addJsExtension: addJsExtension, getCanonicalFileName: getCanonicalFileName, sourceDirectory: sourceDirectory };
+        }
+        function getGlobalModuleSpecifier(moduleFileName, _a, host, compilerOptions) {
+            var addJsExtension = _a.addJsExtension, getCanonicalFileName = _a.getCanonicalFileName, sourceDirectory = _a.sourceDirectory;
+            return tryGetModuleNameFromTypeRoots(compilerOptions, host, getCanonicalFileName, moduleFileName, addJsExtension)
+                || tryGetModuleNameAsNodeModule(compilerOptions, moduleFileName, host, getCanonicalFileName, sourceDirectory)
+                || compilerOptions.rootDirs && tryGetModuleNameFromRootDirs(compilerOptions.rootDirs, moduleFileName, sourceDirectory, getCanonicalFileName);
+        }
+        function getLocalModuleSpecifiers(moduleFileName, _a, compilerOptions, preferences) {
+            var moduleResolutionKind = _a.moduleResolutionKind, addJsExtension = _a.addJsExtension, getCanonicalFileName = _a.getCanonicalFileName, sourceDirectory = _a.sourceDirectory;
+            var baseUrl = compilerOptions.baseUrl, paths = compilerOptions.paths;
+            var relativePath = removeExtensionAndIndexPostFix(ts.ensurePathIsNonModuleName(ts.getRelativePathFromDirectory(sourceDirectory, moduleFileName, getCanonicalFileName)), moduleResolutionKind, addJsExtension);
+            if (!baseUrl || preferences.importModuleSpecifierPreference === "relative") {
+                return [relativePath];
+            }
+            var relativeToBaseUrl = getRelativePathIfInDirectory(moduleFileName, baseUrl, getCanonicalFileName);
+            if (!relativeToBaseUrl) {
+                return [relativePath];
+            }
+            var importRelativeToBaseUrl = removeExtensionAndIndexPostFix(relativeToBaseUrl, moduleResolutionKind, addJsExtension);
+            if (paths) {
+                var fromPaths = tryGetModuleNameFromPaths(ts.removeFileExtension(relativeToBaseUrl), importRelativeToBaseUrl, paths);
+                if (fromPaths) {
+                    return [fromPaths];
+                }
+            }
+            if (preferences.importModuleSpecifierPreference === "non-relative") {
+                return [importRelativeToBaseUrl];
+            }
+            if (preferences.importModuleSpecifierPreference !== undefined)
+                ts.Debug.assertNever(preferences.importModuleSpecifierPreference);
+            if (isPathRelativeToParent(relativeToBaseUrl)) {
+                return [relativePath];
+            }
+            /*
+            Prefer a relative import over a baseUrl import if it doesn't traverse up to baseUrl.
+    
+            Suppose we have:
+                baseUrl = /base
+                sourceDirectory = /base/a/b
+                moduleFileName = /base/foo/bar
+            Then:
+                relativePath = ../../foo/bar
+                getRelativePathNParents(relativePath) = 2
+                pathFromSourceToBaseUrl = ../../
+                getRelativePathNParents(pathFromSourceToBaseUrl) = 2
+                2 < 2 = false
+            In this case we should prefer using the baseUrl path "/a/b" instead of the relative path "../../foo/bar".
+    
+            Suppose we have:
+                baseUrl = /base
+                sourceDirectory = /base/foo/a
+                moduleFileName = /base/foo/bar
+            Then:
+                relativePath = ../a
+                getRelativePathNParents(relativePath) = 1
+                pathFromSourceToBaseUrl = ../../
+                getRelativePathNParents(pathFromSourceToBaseUrl) = 2
+                1 < 2 = true
+            In this case we should prefer using the relative path "../a" instead of the baseUrl path "foo/a".
+            */
+            var pathFromSourceToBaseUrl = ts.ensurePathIsNonModuleName(ts.getRelativePathFromDirectory(sourceDirectory, baseUrl, getCanonicalFileName));
+            var relativeFirst = getRelativePathNParents(relativePath) < getRelativePathNParents(pathFromSourceToBaseUrl);
+            return relativeFirst ? [relativePath, importRelativeToBaseUrl] : [importRelativeToBaseUrl, relativePath];
+        }
+        function usesJsExtensionOnImports(_a) {
+            var imports = _a.imports;
+            return ts.firstDefined(imports, function (_a) {
+                var text = _a.text;
+                return ts.pathIsRelative(text) ? ts.fileExtensionIs(text, ".js" /* Js */) : undefined;
+            }) || false;
+        }
+        /**
+         * Looks for a existing imports that use symlinks to this module.
+         * Only if no symlink is available, the real path will be used.
+         */
+        function getAllModulePaths(program, _a) {
+            var fileName = _a.fileName;
+            var symlinks = ts.mapDefined(program.getSourceFiles(), function (sf) {
+                return sf.resolvedModules && ts.firstDefinedIterator(sf.resolvedModules.values(), function (res) {
+                    return res && res.resolvedFileName === fileName ? res.originalPath : undefined;
+                });
+            });
+            return symlinks.length === 0 ? [fileName] : symlinks;
+        }
+        function getRelativePathNParents(relativePath) {
+            var components = ts.getPathComponents(relativePath);
+            if (components[0] || components.length === 1)
+                return 0;
+            for (var i = 1; i < components.length; i++) {
+                if (components[i] !== "..")
+                    return i - 1;
+            }
+            return components.length - 1;
+        }
+        function tryGetModuleNameFromAmbientModule(moduleSymbol) {
+            var decl = moduleSymbol.valueDeclaration;
+            if (ts.isModuleDeclaration(decl) && ts.isStringLiteral(decl.name)) {
+                return decl.name.text;
+            }
+        }
+        function tryGetModuleNameFromPaths(relativeToBaseUrlWithIndex, relativeToBaseUrl, paths) {
+            for (var key in paths) {
+                for (var _i = 0, _a = paths[key]; _i < _a.length; _i++) {
+                    var patternText_1 = _a[_i];
+                    var pattern = ts.removeFileExtension(ts.normalizePath(patternText_1));
+                    var indexOfStar = pattern.indexOf("*");
+                    if (indexOfStar === 0 && pattern.length === 1) {
+                        continue;
+                    }
+                    else if (indexOfStar !== -1) {
+                        var prefix = pattern.substr(0, indexOfStar);
+                        var suffix = pattern.substr(indexOfStar + 1);
+                        if (relativeToBaseUrl.length >= prefix.length + suffix.length &&
+                            ts.startsWith(relativeToBaseUrl, prefix) &&
+                            ts.endsWith(relativeToBaseUrl, suffix)) {
+                            var matchedStar = relativeToBaseUrl.substr(prefix.length, relativeToBaseUrl.length - suffix.length);
+                            return key.replace("*", matchedStar);
+                        }
+                    }
+                    else if (pattern === relativeToBaseUrl || pattern === relativeToBaseUrlWithIndex) {
+                        return key;
+                    }
+                }
+            }
+        }
+        function tryGetModuleNameFromRootDirs(rootDirs, moduleFileName, sourceDirectory, getCanonicalFileName) {
+            var normalizedTargetPath = getPathRelativeToRootDirs(moduleFileName, rootDirs, getCanonicalFileName);
+            if (normalizedTargetPath === undefined) {
+                return undefined;
+            }
+            var normalizedSourcePath = getPathRelativeToRootDirs(sourceDirectory, rootDirs, getCanonicalFileName);
+            var relativePath = normalizedSourcePath !== undefined ? ts.ensurePathIsNonModuleName(ts.getRelativePathFromDirectory(normalizedSourcePath, normalizedTargetPath, getCanonicalFileName)) : normalizedTargetPath;
+            return ts.removeFileExtension(relativePath);
+        }
+        function tryGetModuleNameFromTypeRoots(options, host, getCanonicalFileName, moduleFileName, addJsExtension) {
+            var roots = ts.getEffectiveTypeRoots(options, host);
+            return ts.firstDefined(roots, function (unNormalizedTypeRoot) {
+                var typeRoot = ts.toPath(unNormalizedTypeRoot, /*basePath*/ undefined, getCanonicalFileName);
+                if (ts.startsWith(moduleFileName, typeRoot)) {
+                    // For a type definition, we can strip `/index` even with classic resolution.
+                    return removeExtensionAndIndexPostFix(moduleFileName.substring(typeRoot.length + 1), ts.ModuleResolutionKind.NodeJs, addJsExtension);
+                }
+            });
+        }
+        function tryGetModuleNameAsNodeModule(options, moduleFileName, host, getCanonicalFileName, sourceDirectory) {
+            if (ts.getEmitModuleResolutionKind(options) !== ts.ModuleResolutionKind.NodeJs) {
+                // nothing to do here
+                return undefined;
+            }
+            var parts = getNodeModulePathParts(moduleFileName);
+            if (!parts) {
+                return undefined;
+            }
+            // Simplify the full file path to something that can be resolved by Node.
+            // If the module could be imported by a directory name, use that directory's name
+            var moduleSpecifier = getDirectoryOrExtensionlessFileName(moduleFileName);
+            // Get a path that's relative to node_modules or the importing file's path
+            // if node_modules folder is in this folder or any of its parent folders, no need to keep it.
+            if (!ts.startsWith(sourceDirectory, moduleSpecifier.substring(0, parts.topLevelNodeModulesIndex)))
+                return undefined;
+            // If the module was found in @types, get the actual Node package name
+            return ts.getPackageNameFromAtTypesDirectory(moduleSpecifier.substring(parts.topLevelPackageNameIndex + 1));
+            function getDirectoryOrExtensionlessFileName(path) {
+                // If the file is the main module, it can be imported by the package name
+                var packageRootPath = path.substring(0, parts.packageRootIndex);
+                var packageJsonPath = ts.combinePaths(packageRootPath, "package.json");
+                if (host.fileExists(packageJsonPath)) { // TODO: GH#18217
+                    var packageJsonContent = JSON.parse(host.readFile(packageJsonPath));
+                    if (packageJsonContent) {
+                        var mainFileRelative = packageJsonContent.typings || packageJsonContent.types || packageJsonContent.main;
+                        if (mainFileRelative) {
+                            var mainExportFile = ts.toPath(mainFileRelative, packageRootPath, getCanonicalFileName);
+                            if (ts.removeFileExtension(mainExportFile) === ts.removeFileExtension(getCanonicalFileName(path))) {
+                                return packageRootPath;
+                            }
+                        }
+                    }
+                }
+                // We still have a file name - remove the extension
+                var fullModulePathWithoutExtension = ts.removeFileExtension(path);
+                // If the file is /index, it can be imported by its directory name
+                // IFF there is not _also_ a file by the same name
+                if (getCanonicalFileName(fullModulePathWithoutExtension.substring(parts.fileNameIndex)) === "/index" && !tryGetAnyFileFromPath(host, fullModulePathWithoutExtension.substring(0, parts.fileNameIndex))) {
+                    return fullModulePathWithoutExtension.substring(0, parts.fileNameIndex);
+                }
+                return fullModulePathWithoutExtension;
+            }
+        }
+        function tryGetAnyFileFromPath(host, path) {
+            // We check all js, `node` and `json` extensions in addition to TS, since node module resolution would also choose those over the directory
+            var extensions = ts.getSupportedExtensions({ allowJs: true }, [{ extension: "node", isMixedContent: false }, { extension: "json", isMixedContent: false, scriptKind: 6 /* JSON */ }]);
+            for (var _i = 0, extensions_1 = extensions; _i < extensions_1.length; _i++) {
+                var e = extensions_1[_i];
+                var fullPath = path + e;
+                if (host.fileExists(fullPath)) { // TODO: GH#18217
+                    return fullPath;
+                }
+            }
+        }
+        function getNodeModulePathParts(fullPath) {
+            // If fullPath can't be valid module file within node_modules, returns undefined.
+            // Example of expected pattern: /base/path/node_modules/[@scope/otherpackage/@otherscope/node_modules/]package/[subdirectory/]file.js
+            // Returns indices:                       ^            ^                                                      ^             ^
+            var topLevelNodeModulesIndex = 0;
+            var topLevelPackageNameIndex = 0;
+            var packageRootIndex = 0;
+            var fileNameIndex = 0;
+            var States;
+            (function (States) {
+                States[States["BeforeNodeModules"] = 0] = "BeforeNodeModules";
+                States[States["NodeModules"] = 1] = "NodeModules";
+                States[States["Scope"] = 2] = "Scope";
+                States[States["PackageContent"] = 3] = "PackageContent";
+            })(States || (States = {}));
+            var partStart = 0;
+            var partEnd = 0;
+            var state = 0 /* BeforeNodeModules */;
+            while (partEnd >= 0) {
+                partStart = partEnd;
+                partEnd = fullPath.indexOf("/", partStart + 1);
+                switch (state) {
+                    case 0 /* BeforeNodeModules */:
+                        if (fullPath.indexOf("/node_modules/", partStart) === partStart) {
+                            topLevelNodeModulesIndex = partStart;
+                            topLevelPackageNameIndex = partEnd;
+                            state = 1 /* NodeModules */;
+                        }
+                        break;
+                    case 1 /* NodeModules */:
+                    case 2 /* Scope */:
+                        if (state === 1 /* NodeModules */ && fullPath.charAt(partStart + 1) === "@") {
+                            state = 2 /* Scope */;
+                        }
+                        else {
+                            packageRootIndex = partEnd;
+                            state = 3 /* PackageContent */;
+                        }
+                        break;
+                    case 3 /* PackageContent */:
+                        if (fullPath.indexOf("/node_modules/", partStart) === partStart) {
+                            state = 1 /* NodeModules */;
+                        }
+                        else {
+                            state = 3 /* PackageContent */;
+                        }
+                        break;
+                }
+            }
+            fileNameIndex = partStart;
+            return state > 1 /* NodeModules */ ? { topLevelNodeModulesIndex: topLevelNodeModulesIndex, topLevelPackageNameIndex: topLevelPackageNameIndex, packageRootIndex: packageRootIndex, fileNameIndex: fileNameIndex } : undefined;
+        }
+        function getPathRelativeToRootDirs(path, rootDirs, getCanonicalFileName) {
+            return ts.firstDefined(rootDirs, function (rootDir) {
+                var relativePath = getRelativePathIfInDirectory(path, rootDir, getCanonicalFileName); // TODO: GH#18217
+                return isPathRelativeToParent(relativePath) ? undefined : relativePath;
+            });
+        }
+        function removeExtensionAndIndexPostFix(fileName, moduleResolutionKind, addJsExtension) {
+            var noExtension = ts.removeFileExtension(fileName);
+            return addJsExtension
+                ? noExtension + ".js"
+                : moduleResolutionKind === ts.ModuleResolutionKind.NodeJs
+                    ? ts.removeSuffix(noExtension, "/index")
+                    : noExtension;
+        }
+        function getRelativePathIfInDirectory(path, directoryPath, getCanonicalFileName) {
+            var relativePath = ts.getRelativePathToDirectoryOrUrl(directoryPath, path, directoryPath, getCanonicalFileName, /*isAbsolutePathAnUrl*/ false);
+            return ts.isRootedDiskPath(relativePath) ? undefined : relativePath;
+        }
+        function isPathRelativeToParent(path) {
+            return ts.startsWith(path, "..");
+        }
+    })(moduleSpecifiers = ts.moduleSpecifiers || (ts.moduleSpecifiers = {}));
+})(ts || (ts = {}));
+/*@internal*/
 var ts;
 (function (ts) {
     var sysFormatDiagnosticsHost = ts.sys ? {
         getCurrentDirectory: function () { return ts.sys.getCurrentDirectory(); },
         getNewLine: function () { return ts.sys.newLine; },
         getCanonicalFileName: ts.createGetCanonicalFileName(ts.sys.useCaseSensitiveFileNames)
-    } : undefined;
+    } : undefined; // TODO: GH#18217
+    /**
+     * Create a function that reports error by writing to the system and handles the formating of the diagnostic
+     */
     function createDiagnosticReporter(system, pretty) {
         var host = system === ts.sys ? sysFormatDiagnosticsHost : {
             getCurrentDirectory: function () { return system.getCurrentDirectory(); },
@@ -67829,14 +84611,18 @@ var ts;
         return function (diagnostic) {
             diagnostics[0] = diagnostic;
             system.write(ts.formatDiagnosticsWithColorAndContext(diagnostics, host) + host.getNewLine());
-            diagnostics[0] = undefined;
+            diagnostics[0] = undefined; // TODO: GH#18217
         };
     }
     ts.createDiagnosticReporter = createDiagnosticReporter;
+    /** @internal */
     ts.nonClearingMessageCodes = [
         ts.Diagnostics.Found_1_error_Watching_for_file_changes.code,
         ts.Diagnostics.Found_0_errors_Watching_for_file_changes.code
     ];
+    /**
+     * @returns Whether the screen was cleared.
+     */
     function clearScreenIfNotWatchingForFileChanges(system, diagnostic, options) {
         if (system.clearScreen &&
             !options.preserveWatchOutput &&
@@ -67848,6 +84634,7 @@ var ts;
         }
         return false;
     }
+    /** @internal */
     ts.screenStartingMessageCodes = [
         ts.Diagnostics.Starting_compilation_in_watch_mode.code,
         ts.Diagnostics.File_change_detected_Starting_incremental_compilation.code,
@@ -67857,6 +84644,9 @@ var ts;
             ? newLine + newLine
             : newLine;
     }
+    /**
+     * Create a function that reports watch status by writing to the system and handles the formating of the diagnostic
+     */
     function createWatchStatusReporter(system, pretty) {
         return pretty ?
             function (diagnostic, newLine, options) {
@@ -67876,19 +84666,26 @@ var ts;
             };
     }
     ts.createWatchStatusReporter = createWatchStatusReporter;
+    /** Parses config file using System interface */
     function parseConfigFileWithSystem(configFileName, optionsToExtend, system, reportDiagnostic) {
         var host = system;
         host.onUnRecoverableConfigFileDiagnostic = function (diagnostic) { return reportUnrecoverableDiagnostic(ts.sys, reportDiagnostic, diagnostic); };
         var result = ts.getParsedCommandLineOfConfigFile(configFileName, optionsToExtend, host);
-        host.onUnRecoverableConfigFileDiagnostic = undefined;
+        host.onUnRecoverableConfigFileDiagnostic = undefined; // TODO: GH#18217
         return result;
     }
     ts.parseConfigFileWithSystem = parseConfigFileWithSystem;
+    /**
+     * Helper that emit files, report diagnostics and lists emitted and/or source files depending on compiler options
+     */
     function emitFilesAndReportErrors(program, reportDiagnostic, writeFileName, reportSummary) {
+        // First get and report any syntactic errors.
         var diagnostics = program.getConfigFileParsingDiagnostics().slice();
         var configFileParsingDiagnosticsLength = diagnostics.length;
         ts.addRange(diagnostics, program.getSyntacticDiagnostics());
         var reportSemanticDiagnostics = false;
+        // If we didn't have any syntactic errors, then also try getting the global and
+        // semantic errors.
         if (diagnostics.length === configFileParsingDiagnosticsLength) {
             ts.addRange(diagnostics, program.getOptionsDiagnostics());
             ts.addRange(diagnostics, program.getGlobalDiagnostics());
@@ -67896,6 +84693,7 @@ var ts;
                 reportSemanticDiagnostics = true;
             }
         }
+        // Emit and report any errors we ran into.
         var _a = program.emit(), emittedFiles = _a.emittedFiles, emitSkipped = _a.emitSkipped, emitDiagnostics = _a.diagnostics;
         ts.addRange(diagnostics, emitDiagnostics);
         if (reportSemanticDiagnostics) {
@@ -67918,15 +84716,21 @@ var ts;
             reportSummary(diagnostics.filter(function (diagnostic) { return diagnostic.category === ts.DiagnosticCategory.Error; }).length);
         }
         if (emitSkipped && diagnostics.length > 0) {
+            // If the emitter didn't emit anything, then pass that value along.
             return ts.ExitStatus.DiagnosticsPresent_OutputsSkipped;
         }
         else if (diagnostics.length > 0) {
+            // The emitter emitted something, inform the caller if that happened in the presence
+            // of diagnostics or not.
             return ts.ExitStatus.DiagnosticsPresent_OutputsGenerated;
         }
         return ts.ExitStatus.Success;
     }
     ts.emitFilesAndReportErrors = emitFilesAndReportErrors;
     var noopFileWatcher = { close: ts.noop };
+    /**
+     * Creates the watch compiler host that can be extended with config file or root file names and options host
+     */
     function createWatchCompilerHost(system, createProgram, reportDiagnostic, reportWatchStatus) {
         if (system === void 0) { system = ts.sys; }
         if (!createProgram) {
@@ -67952,11 +84756,11 @@ var ts;
             watchFile: system.watchFile ? (function (path, callback, pollingInterval) { return system.watchFile(path, callback, pollingInterval); }) : function () { return noopFileWatcher; },
             watchDirectory: system.watchDirectory ? (function (path, callback, recursive) { return system.watchDirectory(path, callback, recursive); }) : function () { return noopFileWatcher; },
             setTimeout: system.setTimeout ? (function (callback, ms) {
-                var _a;
                 var args = [];
                 for (var _i = 2; _i < arguments.length; _i++) {
                     args[_i - 2] = arguments[_i];
                 }
+                var _a;
                 return (_a = system.setTimeout).call.apply(_a, [system, callback, ms].concat(args));
             }) : ts.noop,
             clearTimeout: system.clearTimeout ? (function (timeoutId) { return system.clearTimeout(timeoutId); }) : ts.noop,
@@ -67986,10 +84790,16 @@ var ts;
             emitFilesAndReportErrors(builderProgram, reportDiagnostic, writeFileName, reportSummary);
         }
     }
+    /**
+     * Report error and exit
+     */
     function reportUnrecoverableDiagnostic(system, reportDiagnostic, diagnostic) {
         reportDiagnostic(diagnostic);
         system.exit(ts.ExitStatus.DiagnosticsPresent_OutputsSkipped);
     }
+    /**
+     * Creates the watch compiler host from system for config file in watch mode
+     */
     function createWatchCompilerHostOfConfigFile(configFileName, optionsToExtend, system, createProgram, reportDiagnostic, reportWatchStatus) {
         var diagnosticReporter = reportDiagnostic || createDiagnosticReporter(system);
         var host = createWatchCompilerHost(system, createProgram, diagnosticReporter, reportWatchStatus);
@@ -67999,6 +84809,9 @@ var ts;
         return host;
     }
     ts.createWatchCompilerHostOfConfigFile = createWatchCompilerHostOfConfigFile;
+    /**
+     * Creates the watch compiler host from system for compiling root files and options in watch mode
+     */
     function createWatchCompilerHostOfFilesAndCompilerOptions(rootFiles, options, system, createProgram, reportDiagnostic, reportWatchStatus) {
         var host = createWatchCompilerHost(system, createProgram, reportDiagnostic || createDiagnosticReporter(system), reportWatchStatus);
         host.rootFiles = rootFiles;
@@ -68010,7 +84823,7 @@ var ts;
 (function (ts) {
     function createWatchCompilerHost(rootFilesOrConfigFileName, options, system, createProgram, reportDiagnostic, reportWatchStatus) {
         if (ts.isArray(rootFilesOrConfigFileName)) {
-            return ts.createWatchCompilerHostOfFilesAndCompilerOptions(rootFilesOrConfigFileName, options, system, createProgram, reportDiagnostic, reportWatchStatus);
+            return ts.createWatchCompilerHostOfFilesAndCompilerOptions(rootFilesOrConfigFileName, options, system, createProgram, reportDiagnostic, reportWatchStatus); // TODO: GH#18217
         }
         else {
             return ts.createWatchCompilerHostOfConfigFile(rootFilesOrConfigFileName, options, system, createProgram, reportDiagnostic, reportWatchStatus);
@@ -68020,14 +84833,14 @@ var ts;
     var initialVersion = 1;
     function createWatchProgram(host) {
         var builderProgram;
-        var reloadLevel;
-        var missingFilesMap;
-        var watchedWildcardDirectories;
-        var timerToUpdateProgram;
-        var sourceFilesCache = ts.createMap();
-        var missingFilePathsRequestedForRelease;
-        var hasChangedCompilerOptions = false;
-        var hasChangedAutomaticTypeDirectiveNames = false;
+        var reloadLevel; // level to indicate if the program needs to be reloaded from config file/just filenames etc
+        var missingFilesMap; // Map of file watchers for the missing files
+        var watchedWildcardDirectories; // map of watchers for the wild card directories in the config file
+        var timerToUpdateProgram; // timer callback to recompile the program
+        var sourceFilesCache = ts.createMap(); // Cache that stores the source file and version info
+        var missingFilePathsRequestedForRelease; // These paths are held temparirly so that we can remove the entry from source file cache if the file is not tracked by missing files
+        var hasChangedCompilerOptions = false; // True if the compiler options have changed between compilations
+        var hasChangedAutomaticTypeDirectiveNames = false; // True if the automatic type directives have changed
         var useCaseSensitiveFileNames = host.useCaseSensitiveFileNames();
         var currentDirectory = host.getCurrentDirectory();
         var getCurrentDirectory = function () { return currentDirectory; };
@@ -68050,6 +84863,7 @@ var ts;
             getCurrentDirectory: getCurrentDirectory,
             onUnRecoverableConfigFileDiagnostic: host.onUnRecoverableConfigFileDiagnostic
         };
+        // From tsc we want to get already parsed result and hence check for rootFileNames
         var newLine = updateNewLine();
         reportWatchDiagnostic(ts.Diagnostics.Starting_compilation_in_watch_mode);
         if (configFileName) {
@@ -68066,7 +84880,7 @@ var ts;
         var trace = host.trace && (function (s) { host.trace(s + newLine); });
         var watchLogLevel = trace ? compilerOptions.extendedDiagnostics ? ts.WatchLogLevel.Verbose :
             compilerOptions.diagnostis ? ts.WatchLogLevel.TriggerOnly : ts.WatchLogLevel.None : ts.WatchLogLevel.None;
-        var writeLog = watchLogLevel !== ts.WatchLogLevel.None ? trace : ts.noop;
+        var writeLog = watchLogLevel !== ts.WatchLogLevel.None ? trace : ts.noop; // TODO: GH#18217
         var _b = ts.getWatchFactory(watchLogLevel, writeLog), watchFile = _b.watchFile, watchFilePath = _b.watchFilePath, watchDirectory = _b.watchDirectory;
         var getCanonicalFileName = ts.createGetCanonicalFileName(useCaseSensitiveFileNames);
         writeLog("Current directory: " + currentDirectory + " CaseSensitiveFileNames: " + useCaseSensitiveFileNames);
@@ -68074,6 +84888,7 @@ var ts;
             watchFile(host, configFileName, scheduleProgramReload, ts.PollingInterval.High, "Config file");
         }
         var compilerHost = {
+            // Members for CompilerHost
             getSourceFile: function (fileName, languageVersion, onError, shouldCreateNewSourceFile) { return getVersionedSourceFileByPath(fileName, toPath(fileName), languageVersion, onError, shouldCreateNewSourceFile); },
             getSourceFileByPath: getVersionedSourceFileByPath,
             getDefaultLibLocation: host.getDefaultLibLocation && (function () { return host.getDefaultLibLocation(); }),
@@ -68092,6 +84907,7 @@ var ts;
             getEnvironmentVariable: host.getEnvironmentVariable ? (function (name) { return host.getEnvironmentVariable(name); }) : (function () { return ""; }),
             onReleaseOldSourceFile: onReleaseOldSourceFile,
             createHash: host.createHash && (function (data) { return host.createHash(data); }),
+            // Members for ResolutionCacheHost
             toPath: toPath,
             getCompilationSettings: function () { return compilerOptions; },
             watchDirectoryOfFailedLookupLocation: function (dir, cb, flags) { return watchDirectory(host, dir, cb, flags, "Failed Lookup Locations"); },
@@ -68106,9 +84922,12 @@ var ts;
             getCurrentProgram: getCurrentProgram,
             writeLog: writeLog
         };
+        // Cache for the module resolution
         var resolutionCache = ts.createResolutionCache(compilerHost, configFileName ?
             ts.getDirectoryPath(ts.getNormalizedAbsolutePath(configFileName, currentDirectory)) :
-            currentDirectory, false);
+            currentDirectory, 
+        /*logChangesWhenResolvingModule*/ false);
+        // Resolve module using host module resolution strategy if provided otherwise use resolution cache to resolve module names
         compilerHost.resolveModuleNames = host.resolveModuleNames ?
             (function (moduleNames, containingFile, reusedNames) { return host.resolveModuleNames(moduleNames, containingFile, reusedNames); }) :
             (function (moduleNames, containingFile, reusedNames) { return resolutionCache.resolveModuleNames(moduleNames, containingFile, reusedNames); });
@@ -68117,6 +84936,7 @@ var ts;
             (function (typeDirectiveNames, containingFile) { return resolutionCache.resolveTypeReferenceDirectives(typeDirectiveNames, containingFile); });
         var userProvidedResolution = !!host.resolveModuleNames || !!host.resolveTypeReferenceDirectives;
         synchronizeProgram();
+        // Update the wild card directory watch
         watchConfigFileWildCardDirectories();
         return configFileName ?
             { getCurrentProgram: getCurrentBuilderProgram, getProgram: synchronizeProgram } :
@@ -68136,10 +84956,11 @@ var ts;
                     resolutionCache.clear();
                 }
             }
+            // All resolutions are invalid if user provided resolutions
             var hasInvalidatedResolution = resolutionCache.createHasInvalidatedResolution(userProvidedResolution);
             if (ts.isProgramUptoDate(getCurrentProgram(), rootFileNames, compilerOptions, getSourceVersion, fileExists, hasInvalidatedResolution, hasChangedAutomaticTypeDirectiveNames)) {
                 if (hasChangedConfigFileParsingErrors) {
-                    builderProgram = createProgram(undefined, undefined, compilerHost, builderProgram, configFileParsingDiagnostics);
+                    builderProgram = createProgram(/*rootNames*/ undefined, /*options*/ undefined, compilerHost, builderProgram, configFileParsingDiagnostics);
                     hasChangedConfigFileParsingErrors = false;
                 }
             }
@@ -68152,6 +84973,7 @@ var ts;
             return builderProgram;
         }
         function createNewProgram(program, hasInvalidatedResolution) {
+            // Compile the program
             if (watchLogLevel !== ts.WatchLogLevel.None) {
                 writeLog("CreatingProgramWith::");
                 writeLog("  roots: " + JSON.stringify(rootFileNames));
@@ -68165,11 +84987,17 @@ var ts;
             compilerHost.hasChangedAutomaticTypeDirectiveNames = hasChangedAutomaticTypeDirectiveNames;
             builderProgram = createProgram(rootFileNames, compilerOptions, compilerHost, builderProgram, configFileParsingDiagnostics);
             resolutionCache.finishCachingPerDirectoryResolution();
+            // Update watches
             ts.updateMissingFilePathsWatch(builderProgram.getProgram(), missingFilesMap || (missingFilesMap = ts.createMap()), watchMissingFilePath);
             if (needsUpdateInTypeRootWatch) {
                 resolutionCache.updateTypeRootsWatch();
             }
             if (missingFilePathsRequestedForRelease) {
+                // These are the paths that program creater told us as not in use any more but were missing on the disk.
+                // We didnt remove the entry for them from sourceFiles cache so that we dont have to do File IO,
+                // if there is already watcher for it (for missing files)
+                // At this point our watches were updated, hence now we know that these paths are not tracked and need to be removed
+                // so that at later time we have correct result of their presence
                 for (var _i = 0, missingFilePathsRequestedForRelease_1 = missingFilePathsRequestedForRelease; _i < missingFilePathsRequestedForRelease_1.length; _i++) {
                     var missingFilePath = missingFilePathsRequestedForRelease_1[_i];
                     if (!missingFilesMap.has(missingFilePath)) {
@@ -68198,6 +85026,8 @@ var ts;
         }
         function fileExists(fileName) {
             var path = toPath(fileName);
+            // If file is missing on host from cache, we can definitely say file doesnt exist
+            // otherwise we need to ensure from the disk
             if (isFileMissingOnHost(sourceFilesCache.get(path))) {
                 return true;
             }
@@ -68205,9 +85035,11 @@ var ts;
         }
         function getVersionedSourceFileByPath(fileName, path, languageVersion, onError, shouldCreateNewSourceFile) {
             var hostSourceFile = sourceFilesCache.get(path);
+            // No source file on the host
             if (isFileMissingOnHost(hostSourceFile)) {
                 return undefined;
             }
+            // Create new source file if requested or the versions dont match
             if (!hostSourceFile || shouldCreateNewSourceFile || !isFilePresentOnHost(hostSourceFile) || hostSourceFile.version.toString() !== hostSourceFile.sourceFile.version) {
                 var sourceFile = getNewSourceFile();
                 if (hostSourceFile) {
@@ -68215,6 +85047,7 @@ var ts;
                         hostSourceFile.version++;
                     }
                     if (sourceFile) {
+                        // Set the source file and create file watcher now that file was present on the disk
                         hostSourceFile.sourceFile = sourceFile;
                         sourceFile.version = hostSourceFile.version.toString();
                         if (!hostSourceFile.fileWatcher) {
@@ -68222,6 +85055,7 @@ var ts;
                         }
                     }
                     else {
+                        // There is no source file on host any more, close the watch, missing file paths will track it
                         if (isFilePresentOnHost(hostSourceFile)) {
                             hostSourceFile.fileWatcher.close();
                         }
@@ -68261,6 +85095,7 @@ var ts;
             var hostSourceFile = sourceFilesCache.get(path);
             if (hostSourceFile !== undefined) {
                 if (isFileMissingOnHost(hostSourceFile)) {
+                    // The next version, lets set it as presence unknown file
                     sourceFilesCache.set(path, { version: Number(hostSourceFile) + 1 });
                 }
                 else {
@@ -68274,7 +85109,12 @@ var ts;
         }
         function onReleaseOldSourceFile(oldSourceFile, _oldOptions) {
             var hostSourceFileInfo = sourceFilesCache.get(oldSourceFile.path);
+            // If this is the source file thats in the cache and new program doesnt need it,
+            // remove the cached entry.
+            // Note we arent deleting entry if file became missing in new program or
+            // there was version update and new source file was created.
             if (hostSourceFileInfo) {
+                // record the missing file paths so they can be removed later if watchers arent tracking them
                 if (isFileMissingOnHost(hostSourceFileInfo)) {
                     (missingFilePathsRequestedForRelease || (missingFilePathsRequestedForRelease = [])).push(oldSourceFile.path);
                 }
@@ -68292,6 +85132,9 @@ var ts;
                 host.onWatchStatusChange(ts.createCompilerDiagnostic(message), newLine, compilerOptions || optionsToExtendForConfigFile);
             }
         }
+        // Upon detecting a file change, wait for 250ms and then perform a recompilation. This gives batch
+        // operations (such as saving all modified files in an editor) a chance to complete before we kick
+        // off a new compilation.
         function scheduleProgramUpdate() {
             if (!host.setTimeout || !host.clearTimeout) {
                 return;
@@ -68332,6 +85175,7 @@ var ts;
                 hasChangedConfigFileParsingErrors = true;
             }
             rootFileNames = result.fileNames;
+            // Update the program
             synchronizeProgram();
         }
         function reloadConfigFile() {
@@ -68343,24 +85187,27 @@ var ts;
             parseConfigFile();
             hasChangedCompilerOptions = true;
             synchronizeProgram();
+            // Update the wild card directory watch
             watchConfigFileWildCardDirectories();
         }
         function parseConfigFile() {
-            setConfigFileParsingResult(ts.getParsedCommandLineOfConfigFile(configFileName, optionsToExtendForConfigFile, parseConfigFileHost));
+            setConfigFileParsingResult(ts.getParsedCommandLineOfConfigFile(configFileName, optionsToExtendForConfigFile, parseConfigFileHost)); // TODO: GH#18217
         }
         function setConfigFileParsingResult(configFileParseResult) {
             rootFileNames = configFileParseResult.fileNames;
             compilerOptions = configFileParseResult.options;
-            configFileSpecs = configFileParseResult.configFileSpecs;
+            configFileSpecs = configFileParseResult.configFileSpecs; // TODO: GH#18217
             configFileParsingDiagnostics = ts.getConfigFileParsingDiagnostics(configFileParseResult);
             hasChangedConfigFileParsingErrors = true;
         }
         function onSourceFileChange(fileName, eventKind, path) {
             updateCachedSystemWithFile(fileName, path, eventKind);
+            // Update the source file cache
             if (eventKind === ts.FileWatcherEventKind.Deleted && sourceFilesCache.get(path)) {
                 resolutionCache.invalidateResolutionOfFile(path);
             }
             nextSourceFileVersion(path);
+            // Update the program
             scheduleProgramUpdate();
         }
         function updateCachedSystemWithFile(fileName, path, eventKind) {
@@ -68376,7 +85223,9 @@ var ts;
             if (eventKind === ts.FileWatcherEventKind.Created && missingFilesMap.has(missingFilePath)) {
                 missingFilesMap.get(missingFilePath).close();
                 missingFilesMap.delete(missingFilePath);
+                // Delete the entry in the source files cache so that new source file is created
                 nextSourceFileVersion(missingFilePath);
+                // When a missing file is created, we should update the graph.
                 scheduleProgramUpdate();
             }
         }
@@ -68392,16 +85241,21 @@ var ts;
             return watchDirectory(host, directory, function (fileOrDirectory) {
                 ts.Debug.assert(!!configFileName);
                 var fileOrDirectoryPath = toPath(fileOrDirectory);
+                // Since the file existance changed, update the sourceFiles cache
                 if (cachedDirectoryStructureHost) {
                     cachedDirectoryStructureHost.addOrDeleteFileOrDirectory(fileOrDirectory, fileOrDirectoryPath);
                 }
                 nextSourceFileVersion(fileOrDirectoryPath);
+                // If the the added or created file or directory is not supported file name, ignore the file
+                // But when watched directory is added/removed, we need to reload the file list
                 if (fileOrDirectoryPath !== directory && ts.hasExtension(fileOrDirectoryPath) && !ts.isSupportedSourceFileName(fileOrDirectory, compilerOptions)) {
                     writeLog("Project: " + configFileName + " Detected file add/remove of non supported extension: " + fileOrDirectory);
                     return;
                 }
+                // Reload is pending, do the reload
                 if (reloadLevel !== ts.ConfigFileProgramReloadLevel.Full) {
                     reloadLevel = ts.ConfigFileProgramReloadLevel.Partial;
+                    // Schedule Update the program
                     scheduleProgramUpdate();
                 }
             }, flags, "Wild card directories");
@@ -68432,1878 +85286,977 @@ var ts;
 })(ts || (ts = {}));
 var ts;
 (function (ts) {
-    ts.compileOnSaveCommandLineOption = { name: "compileOnSave", type: "boolean" };
-    ts.optionDeclarations = [
+    var minimumDate = new Date(-8640000000000000);
+    var maximumDate = new Date(8640000000000000);
+    var BuildResultFlags;
+    (function (BuildResultFlags) {
+        BuildResultFlags[BuildResultFlags["None"] = 0] = "None";
+        /**
+         * No errors of any kind occurred during build
+         */
+        BuildResultFlags[BuildResultFlags["Success"] = 1] = "Success";
+        /**
+         * None of the .d.ts files emitted by this build were
+         * different from the existing files on disk
+         */
+        BuildResultFlags[BuildResultFlags["DeclarationOutputUnchanged"] = 2] = "DeclarationOutputUnchanged";
+        BuildResultFlags[BuildResultFlags["ConfigFileErrors"] = 4] = "ConfigFileErrors";
+        BuildResultFlags[BuildResultFlags["SyntaxErrors"] = 8] = "SyntaxErrors";
+        BuildResultFlags[BuildResultFlags["TypeErrors"] = 16] = "TypeErrors";
+        BuildResultFlags[BuildResultFlags["DeclarationEmitErrors"] = 32] = "DeclarationEmitErrors";
+        BuildResultFlags[BuildResultFlags["AnyErrors"] = 60] = "AnyErrors";
+    })(BuildResultFlags || (BuildResultFlags = {}));
+    var UpToDateStatusType;
+    (function (UpToDateStatusType) {
+        UpToDateStatusType[UpToDateStatusType["Unbuildable"] = 0] = "Unbuildable";
+        UpToDateStatusType[UpToDateStatusType["UpToDate"] = 1] = "UpToDate";
+        /**
+         * The project appears out of date because its upstream inputs are newer than its outputs,
+         * but all of its outputs are actually newer than the previous identical outputs of its (.d.ts) inputs.
+         * This means we can Pseudo-build (just touch timestamps), as if we had actually built this project.
+         */
+        UpToDateStatusType[UpToDateStatusType["UpToDateWithUpstreamTypes"] = 2] = "UpToDateWithUpstreamTypes";
+        UpToDateStatusType[UpToDateStatusType["OutputMissing"] = 3] = "OutputMissing";
+        UpToDateStatusType[UpToDateStatusType["OutOfDateWithSelf"] = 4] = "OutOfDateWithSelf";
+        UpToDateStatusType[UpToDateStatusType["OutOfDateWithUpstream"] = 5] = "OutOfDateWithUpstream";
+        UpToDateStatusType[UpToDateStatusType["UpstreamOutOfDate"] = 6] = "UpstreamOutOfDate";
+        UpToDateStatusType[UpToDateStatusType["UpstreamBlocked"] = 7] = "UpstreamBlocked";
+        /**
+         * Projects with no outputs (i.e. "solution" files)
+         */
+        UpToDateStatusType[UpToDateStatusType["ContainerOnly"] = 8] = "ContainerOnly";
+    })(UpToDateStatusType = ts.UpToDateStatusType || (ts.UpToDateStatusType = {}));
+    /**
+     * A FileMap maintains a normalized-key to value relationship
+     */
+    function createFileMap() {
+        // tslint:disable-next-line:no-null-keyword
+        var lookup = ts.createMap();
+        return {
+            setValue: setValue,
+            getValue: getValue,
+            getValueOrUndefined: getValueOrUndefined,
+            removeKey: removeKey,
+            getKeys: getKeys,
+            hasKey: hasKey
+        };
+        function getKeys() {
+            return Object.keys(lookup);
+        }
+        function hasKey(fileName) {
+            return lookup.has(ts.normalizePath(fileName));
+        }
+        function removeKey(fileName) {
+            lookup.delete(ts.normalizePath(fileName));
+        }
+        function setValue(fileName, value) {
+            lookup.set(ts.normalizePath(fileName), value);
+        }
+        function getValue(fileName) {
+            var f = ts.normalizePath(fileName);
+            if (lookup.has(f)) {
+                return lookup.get(f);
+            }
+            else {
+                throw new Error("No value corresponding to " + fileName + " exists in this map");
+            }
+        }
+        function getValueOrUndefined(fileName) {
+            var f = ts.normalizePath(fileName);
+            return lookup.get(f);
+        }
+    }
+    function createDependencyMapper() {
+        var childToParents = createFileMap();
+        var parentToChildren = createFileMap();
+        var allKeys = createFileMap();
+        function addReference(childConfigFileName, parentConfigFileName) {
+            addEntry(childToParents, childConfigFileName, parentConfigFileName);
+            addEntry(parentToChildren, parentConfigFileName, childConfigFileName);
+        }
+        function getReferencesTo(parentConfigFileName) {
+            return parentToChildren.getValueOrUndefined(parentConfigFileName) || [];
+        }
+        function getReferencesOf(childConfigFileName) {
+            return childToParents.getValueOrUndefined(childConfigFileName) || [];
+        }
+        function getKeys() {
+            return allKeys.getKeys();
+        }
+        function addEntry(mapToAddTo, key, element) {
+            key = ts.normalizePath(key);
+            element = ts.normalizePath(element);
+            var arr = mapToAddTo.getValueOrUndefined(key);
+            if (arr === undefined) {
+                mapToAddTo.setValue(key, arr = []);
+            }
+            if (arr.indexOf(element) < 0) {
+                arr.push(element);
+            }
+            allKeys.setValue(key, true);
+            allKeys.setValue(element, true);
+        }
+        return {
+            addReference: addReference,
+            getReferencesTo: getReferencesTo,
+            getReferencesOf: getReferencesOf,
+            getKeys: getKeys
+        };
+    }
+    ts.createDependencyMapper = createDependencyMapper;
+    function getOutputDeclarationFileName(inputFileName, configFile) {
+        var relativePath = ts.getRelativePathFromDirectory(rootDirOfOptions(configFile.options, configFile.options.configFilePath), inputFileName, /*ignoreCase*/ true);
+        var outputPath = ts.resolvePath(configFile.options.declarationDir || configFile.options.outDir || ts.getDirectoryPath(configFile.options.configFilePath), relativePath);
+        return ts.changeExtension(outputPath, ".d.ts" /* Dts */);
+    }
+    function getOutputJavaScriptFileName(inputFileName, configFile) {
+        var relativePath = ts.getRelativePathFromDirectory(rootDirOfOptions(configFile.options, configFile.options.configFilePath), inputFileName, /*ignoreCase*/ true);
+        var outputPath = ts.resolvePath(configFile.options.outDir || ts.getDirectoryPath(configFile.options.configFilePath), relativePath);
+        return ts.changeExtension(outputPath, (ts.fileExtensionIs(inputFileName, ".tsx" /* Tsx */) && configFile.options.jsx === 1 /* Preserve */) ? ".jsx" /* Jsx */ : ".js" /* Js */);
+    }
+    function getOutputFileNames(inputFileName, configFile) {
+        if (configFile.options.outFile) {
+            return ts.emptyArray;
+        }
+        var outputs = [];
+        outputs.push(getOutputJavaScriptFileName(inputFileName, configFile));
+        if (configFile.options.declaration) {
+            var dts = outputs.push(getOutputDeclarationFileName(inputFileName, configFile));
+            if (configFile.options.declarationMap) {
+                outputs.push(dts + ".map");
+            }
+        }
+        return outputs;
+    }
+    function getOutFileOutputs(project) {
+        if (!project.options.outFile) {
+            return ts.Debug.fail("outFile must be set");
+        }
+        var outputs = [];
+        outputs.push(project.options.outFile);
+        if (project.options.declaration) {
+            var dts = ts.changeExtension(project.options.outFile, ".d.ts" /* Dts */);
+            outputs.push(dts);
+            if (project.options.declarationMap) {
+                outputs.push(dts + ".map");
+            }
+        }
+        return outputs;
+    }
+    function rootDirOfOptions(opts, configFileName) {
+        return opts.rootDir || ts.getDirectoryPath(configFileName);
+    }
+    function createConfigFileCache(host) {
+        var cache = createFileMap();
+        var configParseHost = ts.parseConfigHostFromCompilerHost(host);
+        function parseConfigFile(configFilePath) {
+            var sourceFile = host.getSourceFile(configFilePath, 100 /* JSON */);
+            if (sourceFile === undefined) {
+                return undefined;
+            }
+            var parsed = ts.parseJsonSourceFileConfigFileContent(sourceFile, configParseHost, ts.getDirectoryPath(configFilePath));
+            parsed.options.configFilePath = configFilePath;
+            cache.setValue(configFilePath, parsed);
+            return parsed;
+        }
+        function removeKey(configFilePath) {
+            cache.removeKey(configFilePath);
+        }
+        return {
+            parseConfigFile: parseConfigFile,
+            removeKey: removeKey
+        };
+    }
+    function newer(date1, date2) {
+        return date2 > date1 ? date2 : date1;
+    }
+    function isDeclarationFile(fileName) {
+        return ts.fileExtensionIs(fileName, ".d.ts" /* Dts */);
+    }
+    function createBuildContext(options) {
+        var invalidatedProjects = createFileMap();
+        var queuedProjects = createFileMap();
+        var missingRoots = ts.createMap();
+        return {
+            options: options,
+            projectStatus: createFileMap(),
+            unchangedOutputs: createFileMap(),
+            invalidatedProjects: invalidatedProjects,
+            missingRoots: missingRoots,
+            queuedProjects: queuedProjects
+        };
+    }
+    ts.createBuildContext = createBuildContext;
+    var buildOpts = [
         {
-            name: "help",
-            shortName: "h",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
+            name: "verbose",
+            shortName: "v",
             category: ts.Diagnostics.Command_line_Options,
-            description: ts.Diagnostics.Print_this_message,
-        },
-        {
-            name: "help",
-            shortName: "?",
+            description: ts.Diagnostics.Enable_verbose_logging,
             type: "boolean"
         },
         {
-            name: "all",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
+            name: "dry",
+            shortName: "d",
             category: ts.Diagnostics.Command_line_Options,
-            description: ts.Diagnostics.Show_all_compiler_options,
+            description: ts.Diagnostics.Show_what_would_be_built_or_deleted_if_specified_with_clean,
+            type: "boolean"
         },
         {
-            name: "version",
-            shortName: "v",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
+            name: "force",
+            shortName: "f",
             category: ts.Diagnostics.Command_line_Options,
-            description: ts.Diagnostics.Print_the_compiler_s_version,
+            description: ts.Diagnostics.Build_all_projects_including_those_that_appear_to_be_up_to_date,
+            type: "boolean"
         },
         {
-            name: "init",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
+            name: "clean",
             category: ts.Diagnostics.Command_line_Options,
-            description: ts.Diagnostics.Initializes_a_TypeScript_project_and_creates_a_tsconfig_json_file,
-        },
-        {
-            name: "project",
-            shortName: "p",
-            type: "string",
-            isFilePath: true,
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Command_line_Options,
-            paramType: ts.Diagnostics.FILE_OR_DIRECTORY,
-            description: ts.Diagnostics.Compile_the_project_given_the_path_to_its_configuration_file_or_to_a_folder_with_a_tsconfig_json,
-        },
-        {
-            name: "pretty",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Command_line_Options,
-            description: ts.Diagnostics.Stylize_errors_and_messages_using_color_and_context_experimental
-        },
-        {
-            name: "preserveWatchOutput",
-            type: "boolean",
-            showInSimplifiedHelpView: false,
-            category: ts.Diagnostics.Command_line_Options,
-            description: ts.Diagnostics.Whether_to_keep_outdated_console_output_in_watch_mode_instead_of_clearing_the_screen,
+            description: ts.Diagnostics.Delete_the_outputs_of_all_projects,
+            type: "boolean"
         },
         {
             name: "watch",
-            shortName: "w",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
             category: ts.Diagnostics.Command_line_Options,
             description: ts.Diagnostics.Watch_input_files,
-        },
-        {
-            name: "target",
-            shortName: "t",
-            type: ts.createMapFromTemplate({
-                es3: 0,
-                es5: 1,
-                es6: 2,
-                es2015: 2,
-                es2016: 3,
-                es2017: 4,
-                es2018: 5,
-                esnext: 6,
-            }),
-            paramType: ts.Diagnostics.VERSION,
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Specify_ECMAScript_target_version_Colon_ES3_default_ES5_ES2015_ES2016_ES2017_ES2018_or_ESNEXT,
-        },
-        {
-            name: "module",
-            shortName: "m",
-            type: ts.createMapFromTemplate({
-                none: ts.ModuleKind.None,
-                commonjs: ts.ModuleKind.CommonJS,
-                amd: ts.ModuleKind.AMD,
-                system: ts.ModuleKind.System,
-                umd: ts.ModuleKind.UMD,
-                es6: ts.ModuleKind.ES2015,
-                es2015: ts.ModuleKind.ES2015,
-                esnext: ts.ModuleKind.ESNext
-            }),
-            paramType: ts.Diagnostics.KIND,
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Specify_module_code_generation_Colon_none_commonjs_amd_system_umd_es2015_or_ESNext,
-        },
-        {
-            name: "lib",
-            type: "list",
-            element: {
-                name: "lib",
-                type: ts.createMapFromTemplate({
-                    "es5": "lib.es5.d.ts",
-                    "es6": "lib.es2015.d.ts",
-                    "es2015": "lib.es2015.d.ts",
-                    "es7": "lib.es2016.d.ts",
-                    "es2016": "lib.es2016.d.ts",
-                    "es2017": "lib.es2017.d.ts",
-                    "es2018": "lib.es2018.d.ts",
-                    "esnext": "lib.esnext.d.ts",
-                    "dom": "lib.dom.d.ts",
-                    "dom.iterable": "lib.dom.iterable.d.ts",
-                    "webworker": "lib.webworker.d.ts",
-                    "scripthost": "lib.scripthost.d.ts",
-                    "es2015.core": "lib.es2015.core.d.ts",
-                    "es2015.collection": "lib.es2015.collection.d.ts",
-                    "es2015.generator": "lib.es2015.generator.d.ts",
-                    "es2015.iterable": "lib.es2015.iterable.d.ts",
-                    "es2015.promise": "lib.es2015.promise.d.ts",
-                    "es2015.proxy": "lib.es2015.proxy.d.ts",
-                    "es2015.reflect": "lib.es2015.reflect.d.ts",
-                    "es2015.symbol": "lib.es2015.symbol.d.ts",
-                    "es2015.symbol.wellknown": "lib.es2015.symbol.wellknown.d.ts",
-                    "es2016.array.include": "lib.es2016.array.include.d.ts",
-                    "es2017.object": "lib.es2017.object.d.ts",
-                    "es2017.sharedmemory": "lib.es2017.sharedmemory.d.ts",
-                    "es2017.string": "lib.es2017.string.d.ts",
-                    "es2017.intl": "lib.es2017.intl.d.ts",
-                    "es2017.typedarrays": "lib.es2017.typedarrays.d.ts",
-                    "es2018.intl": "lib.es2018.intl.d.ts",
-                    "es2018.promise": "lib.es2018.promise.d.ts",
-                    "es2018.regexp": "lib.es2018.regexp.d.ts",
-                    "esnext.array": "lib.esnext.array.d.ts",
-                    "esnext.symbol": "lib.esnext.symbol.d.ts",
-                    "esnext.asynciterable": "lib.esnext.asynciterable.d.ts",
-                }),
-            },
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Specify_library_files_to_be_included_in_the_compilation
-        },
-        {
-            name: "allowJs",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Allow_javascript_files_to_be_compiled
-        },
-        {
-            name: "checkJs",
-            type: "boolean",
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Report_errors_in_js_files
-        },
-        {
-            name: "jsx",
-            type: ts.createMapFromTemplate({
-                "preserve": 1,
-                "react-native": 3,
-                "react": 2
-            }),
-            paramType: ts.Diagnostics.KIND,
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Specify_JSX_code_generation_Colon_preserve_react_native_or_react,
-        },
-        {
-            name: "declaration",
-            shortName: "d",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Generates_corresponding_d_ts_file,
-        },
-        {
-            name: "declarationMap",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Generates_a_sourcemap_for_each_corresponding_d_ts_file,
-        },
-        {
-            name: "emitDeclarationOnly",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Only_emit_d_ts_declaration_files,
-        },
-        {
-            name: "sourceMap",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Generates_corresponding_map_file,
-        },
-        {
-            name: "outFile",
-            type: "string",
-            isFilePath: true,
-            paramType: ts.Diagnostics.FILE,
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Concatenate_and_emit_output_to_single_file,
-        },
-        {
-            name: "outDir",
-            type: "string",
-            isFilePath: true,
-            paramType: ts.Diagnostics.DIRECTORY,
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Redirect_output_structure_to_the_directory,
-        },
-        {
-            name: "rootDir",
-            type: "string",
-            isFilePath: true,
-            paramType: ts.Diagnostics.LOCATION,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Specify_the_root_directory_of_input_files_Use_to_control_the_output_directory_structure_with_outDir,
-        },
-        {
-            name: "composite",
-            type: "boolean",
-            isTSConfigOnly: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Enable_project_compilation,
-        },
-        {
-            name: "removeComments",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Do_not_emit_comments_to_output,
-        },
-        {
-            name: "noEmit",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Do_not_emit_outputs,
-        },
-        {
-            name: "importHelpers",
-            type: "boolean",
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Import_emit_helpers_from_tslib
-        },
-        {
-            name: "downlevelIteration",
-            type: "boolean",
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Provide_full_support_for_iterables_in_for_of_spread_and_destructuring_when_targeting_ES5_or_ES3
-        },
-        {
-            name: "isolatedModules",
-            type: "boolean",
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Transpile_each_file_as_a_separate_module_similar_to_ts_transpileModule
-        },
-        {
-            name: "strict",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Strict_Type_Checking_Options,
-            description: ts.Diagnostics.Enable_all_strict_type_checking_options
-        },
-        {
-            name: "noImplicitAny",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Strict_Type_Checking_Options,
-            description: ts.Diagnostics.Raise_error_on_expressions_and_declarations_with_an_implied_any_type,
-        },
-        {
-            name: "strictNullChecks",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Strict_Type_Checking_Options,
-            description: ts.Diagnostics.Enable_strict_null_checks
-        },
-        {
-            name: "strictFunctionTypes",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Strict_Type_Checking_Options,
-            description: ts.Diagnostics.Enable_strict_checking_of_function_types
-        },
-        {
-            name: "strictPropertyInitialization",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Strict_Type_Checking_Options,
-            description: ts.Diagnostics.Enable_strict_checking_of_property_initialization_in_classes
-        },
-        {
-            name: "noImplicitThis",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Strict_Type_Checking_Options,
-            description: ts.Diagnostics.Raise_error_on_this_expressions_with_an_implied_any_type,
-        },
-        {
-            name: "alwaysStrict",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Strict_Type_Checking_Options,
-            description: ts.Diagnostics.Parse_in_strict_mode_and_emit_use_strict_for_each_source_file
-        },
-        {
-            name: "noUnusedLocals",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Additional_Checks,
-            description: ts.Diagnostics.Report_errors_on_unused_locals,
-        },
-        {
-            name: "noUnusedParameters",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Additional_Checks,
-            description: ts.Diagnostics.Report_errors_on_unused_parameters,
-        },
-        {
-            name: "noImplicitReturns",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Additional_Checks,
-            description: ts.Diagnostics.Report_error_when_not_all_code_paths_in_function_return_a_value
-        },
-        {
-            name: "noFallthroughCasesInSwitch",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Additional_Checks,
-            description: ts.Diagnostics.Report_errors_for_fallthrough_cases_in_switch_statement
-        },
-        {
-            name: "moduleResolution",
-            type: ts.createMapFromTemplate({
-                node: ts.ModuleResolutionKind.NodeJs,
-                classic: ts.ModuleResolutionKind.Classic,
-            }),
-            paramType: ts.Diagnostics.STRATEGY,
-            category: ts.Diagnostics.Module_Resolution_Options,
-            description: ts.Diagnostics.Specify_module_resolution_strategy_Colon_node_Node_js_or_classic_TypeScript_pre_1_6,
-        },
-        {
-            name: "baseUrl",
-            type: "string",
-            isFilePath: true,
-            category: ts.Diagnostics.Module_Resolution_Options,
-            description: ts.Diagnostics.Base_directory_to_resolve_non_absolute_module_names
-        },
-        {
-            name: "paths",
-            type: "object",
-            isTSConfigOnly: true,
-            category: ts.Diagnostics.Module_Resolution_Options,
-            description: ts.Diagnostics.A_series_of_entries_which_re_map_imports_to_lookup_locations_relative_to_the_baseUrl
-        },
-        {
-            name: "rootDirs",
-            type: "list",
-            isTSConfigOnly: true,
-            element: {
-                name: "rootDirs",
-                type: "string",
-                isFilePath: true
-            },
-            category: ts.Diagnostics.Module_Resolution_Options,
-            description: ts.Diagnostics.List_of_root_folders_whose_combined_content_represents_the_structure_of_the_project_at_runtime
-        },
-        {
-            name: "typeRoots",
-            type: "list",
-            element: {
-                name: "typeRoots",
-                type: "string",
-                isFilePath: true
-            },
-            category: ts.Diagnostics.Module_Resolution_Options,
-            description: ts.Diagnostics.List_of_folders_to_include_type_definitions_from
-        },
-        {
-            name: "types",
-            type: "list",
-            element: {
-                name: "types",
-                type: "string"
-            },
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Module_Resolution_Options,
-            description: ts.Diagnostics.Type_declaration_files_to_be_included_in_compilation
-        },
-        {
-            name: "allowSyntheticDefaultImports",
-            type: "boolean",
-            category: ts.Diagnostics.Module_Resolution_Options,
-            description: ts.Diagnostics.Allow_default_imports_from_modules_with_no_default_export_This_does_not_affect_code_emit_just_typechecking
-        },
-        {
-            name: "esModuleInterop",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Module_Resolution_Options,
-            description: ts.Diagnostics.Enables_emit_interoperability_between_CommonJS_and_ES_Modules_via_creation_of_namespace_objects_for_all_imports_Implies_allowSyntheticDefaultImports
-        },
-        {
-            name: "preserveSymlinks",
-            type: "boolean",
-            category: ts.Diagnostics.Module_Resolution_Options,
-            description: ts.Diagnostics.Do_not_resolve_the_real_path_of_symlinks,
-        },
-        {
-            name: "sourceRoot",
-            type: "string",
-            isFilePath: true,
-            paramType: ts.Diagnostics.LOCATION,
-            category: ts.Diagnostics.Source_Map_Options,
-            description: ts.Diagnostics.Specify_the_location_where_debugger_should_locate_TypeScript_files_instead_of_source_locations,
-        },
-        {
-            name: "mapRoot",
-            type: "string",
-            isFilePath: true,
-            paramType: ts.Diagnostics.LOCATION,
-            category: ts.Diagnostics.Source_Map_Options,
-            description: ts.Diagnostics.Specify_the_location_where_debugger_should_locate_map_files_instead_of_generated_locations,
-        },
-        {
-            name: "inlineSourceMap",
-            type: "boolean",
-            category: ts.Diagnostics.Source_Map_Options,
-            description: ts.Diagnostics.Emit_a_single_file_with_source_maps_instead_of_having_a_separate_file
-        },
-        {
-            name: "inlineSources",
-            type: "boolean",
-            category: ts.Diagnostics.Source_Map_Options,
-            description: ts.Diagnostics.Emit_the_source_alongside_the_sourcemaps_within_a_single_file_requires_inlineSourceMap_or_sourceMap_to_be_set
-        },
-        {
-            name: "experimentalDecorators",
-            type: "boolean",
-            category: ts.Diagnostics.Experimental_Options,
-            description: ts.Diagnostics.Enables_experimental_support_for_ES7_decorators
-        },
-        {
-            name: "emitDecoratorMetadata",
-            type: "boolean",
-            category: ts.Diagnostics.Experimental_Options,
-            description: ts.Diagnostics.Enables_experimental_support_for_emitting_type_metadata_for_decorators
-        },
-        {
-            name: "jsxFactory",
-            type: "string",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Specify_the_JSX_factory_function_to_use_when_targeting_react_JSX_emit_e_g_React_createElement_or_h
-        },
-        {
-            name: "diagnostics",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Show_diagnostic_information
-        },
-        {
-            name: "extendedDiagnostics",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Show_verbose_diagnostic_information
-        },
-        {
-            name: "traceResolution",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Enable_tracing_of_the_name_resolution_process
-        },
-        {
-            name: "resolveJsonModule",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Include_modules_imported_with_json_extension
-        },
-        {
-            name: "listFiles",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Print_names_of_files_part_of_the_compilation
-        },
-        {
-            name: "listEmittedFiles",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Print_names_of_generated_files_part_of_the_compilation
-        },
-        {
-            name: "out",
-            type: "string",
-            isFilePath: false,
-            category: ts.Diagnostics.Advanced_Options,
-            paramType: ts.Diagnostics.FILE,
-            description: ts.Diagnostics.Deprecated_Use_outFile_instead_Concatenate_and_emit_output_to_single_file,
-        },
-        {
-            name: "reactNamespace",
-            type: "string",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Deprecated_Use_jsxFactory_instead_Specify_the_object_invoked_for_createElement_when_targeting_react_JSX_emit
-        },
-        {
-            name: "skipDefaultLibCheck",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Deprecated_Use_skipLibCheck_instead_Skip_type_checking_of_default_library_declaration_files
-        },
-        {
-            name: "charset",
-            type: "string",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.The_character_set_of_the_input_files
-        },
-        {
-            name: "emitBOM",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Emit_a_UTF_8_Byte_Order_Mark_BOM_in_the_beginning_of_output_files
-        },
-        {
-            name: "locale",
-            type: "string",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.The_locale_used_when_displaying_messages_to_the_user_e_g_en_us
-        },
-        {
-            name: "newLine",
-            type: ts.createMapFromTemplate({
-                crlf: 0,
-                lf: 1
-            }),
-            paramType: ts.Diagnostics.NEWLINE,
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Specify_the_end_of_line_sequence_to_be_used_when_emitting_files_Colon_CRLF_dos_or_LF_unix,
-        },
-        {
-            name: "noErrorTruncation",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Do_not_truncate_error_messages
-        },
-        {
-            name: "noLib",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Do_not_include_the_default_library_file_lib_d_ts
-        },
-        {
-            name: "noResolve",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Do_not_add_triple_slash_references_or_imported_modules_to_the_list_of_compiled_files
-        },
-        {
-            name: "stripInternal",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Do_not_emit_declarations_for_code_that_has_an_internal_annotation,
-        },
-        {
-            name: "disableSizeLimit",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Disable_size_limitations_on_JavaScript_projects
-        },
-        {
-            name: "noImplicitUseStrict",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Do_not_emit_use_strict_directives_in_module_output
-        },
-        {
-            name: "noEmitHelpers",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Do_not_generate_custom_helper_functions_like_extends_in_compiled_output
-        },
-        {
-            name: "noEmitOnError",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Do_not_emit_outputs_if_any_errors_were_reported,
-        },
-        {
-            name: "preserveConstEnums",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Do_not_erase_const_enum_declarations_in_generated_code
-        },
-        {
-            name: "declarationDir",
-            type: "string",
-            isFilePath: true,
-            paramType: ts.Diagnostics.DIRECTORY,
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Output_directory_for_generated_declaration_files
-        },
-        {
-            name: "skipLibCheck",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Skip_type_checking_of_declaration_files,
-        },
-        {
-            name: "allowUnusedLabels",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Do_not_report_errors_on_unused_labels
-        },
-        {
-            name: "allowUnreachableCode",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Do_not_report_errors_on_unreachable_code
-        },
-        {
-            name: "suppressExcessPropertyErrors",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Suppress_excess_property_checks_for_object_literals,
-        },
-        {
-            name: "suppressImplicitAnyIndexErrors",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Suppress_noImplicitAny_errors_for_indexing_objects_lacking_index_signatures,
-        },
-        {
-            name: "forceConsistentCasingInFileNames",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Disallow_inconsistently_cased_references_to_the_same_file
-        },
-        {
-            name: "maxNodeModuleJsDepth",
-            type: "number",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.The_maximum_dependency_depth_to_search_under_node_modules_and_load_JavaScript_files
-        },
-        {
-            name: "noStrictGenericChecks",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Disable_strict_checking_of_generic_signatures_in_function_types,
-        },
-        {
-            name: "keyofStringsOnly",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Resolve_keyof_to_string_valued_property_names_only_no_numbers_or_symbols,
-        },
-        {
-            name: "plugins",
-            type: "list",
-            isTSConfigOnly: true,
-            element: {
-                name: "plugin",
-                type: "object"
-            },
-            description: ts.Diagnostics.List_of_language_service_plugins
+            type: "boolean"
         }
     ];
-    ts.typeAcquisitionDeclarations = [
-        {
-            name: "enableAutoDiscovery",
-            type: "boolean",
-        },
-        {
-            name: "enable",
-            type: "boolean",
-        },
-        {
-            name: "include",
-            type: "list",
-            element: {
-                name: "include",
-                type: "string"
+    function performBuild(args, compilerHost, buildHost, system) {
+        var verbose = false;
+        var dry = false;
+        var force = false;
+        var clean = false;
+        var watch = false;
+        var projects = [];
+        for (var _i = 0, args_3 = args; _i < args_3.length; _i++) {
+            var arg = args_3[_i];
+            switch (arg.toLowerCase()) {
+                case "-v":
+                case "--verbose":
+                    verbose = true;
+                    continue;
+                case "-d":
+                case "--dry":
+                    dry = true;
+                    continue;
+                case "-f":
+                case "--force":
+                    force = true;
+                    continue;
+                case "--clean":
+                    clean = true;
+                    continue;
+                case "--watch":
+                case "-w":
+                    watch = true;
+                    continue;
+                case "--?":
+                case "-?":
+                case "--help":
+                    return ts.printHelp(buildOpts, "--build ");
             }
-        },
-        {
-            name: "exclude",
-            type: "list",
-            element: {
-                name: "exclude",
-                type: "string"
+            // Not a flag, parse as filename
+            addProject(arg);
+        }
+        // Nonsensical combinations
+        if (clean && force) {
+            return buildHost.error(ts.Diagnostics.Options_0_and_1_cannot_be_combined, "clean", "force");
+        }
+        if (clean && verbose) {
+            return buildHost.error(ts.Diagnostics.Options_0_and_1_cannot_be_combined, "clean", "verbose");
+        }
+        if (clean && watch) {
+            return buildHost.error(ts.Diagnostics.Options_0_and_1_cannot_be_combined, "clean", "watch");
+        }
+        if (watch && dry) {
+            return buildHost.error(ts.Diagnostics.Options_0_and_1_cannot_be_combined, "watch", "dry");
+        }
+        if (projects.length === 0) {
+            // tsc -b invoked with no extra arguments; act as if invoked with "tsc -b ."
+            addProject(".");
+        }
+        var builder = createSolutionBuilder(compilerHost, buildHost, projects, { dry: dry, force: force, verbose: verbose }, system);
+        if (clean) {
+            builder.cleanAllProjects();
+        }
+        else {
+            builder.buildAllProjects();
+        }
+        if (watch) {
+            return builder.startWatching();
+        }
+        function addProject(projectSpecification) {
+            var fileName = ts.resolvePath(compilerHost.getCurrentDirectory(), projectSpecification);
+            var refPath = ts.resolveProjectReferencePath(compilerHost, { path: fileName });
+            if (!refPath) {
+                return buildHost.error(ts.Diagnostics.File_0_does_not_exist, projectSpecification);
             }
-        }
-    ];
-    ts.defaultInitCompilerOptions = {
-        module: ts.ModuleKind.CommonJS,
-        target: 1,
-        strict: true,
-        esModuleInterop: true
-    };
-    var optionNameMapCache;
-    function convertEnableAutoDiscoveryToEnable(typeAcquisition) {
-        if (typeAcquisition && typeAcquisition.enableAutoDiscovery !== undefined && typeAcquisition.enable === undefined) {
-            return {
-                enable: typeAcquisition.enableAutoDiscovery,
-                include: typeAcquisition.include || [],
-                exclude: typeAcquisition.exclude || []
-            };
-        }
-        return typeAcquisition;
-    }
-    ts.convertEnableAutoDiscoveryToEnable = convertEnableAutoDiscoveryToEnable;
-    function getOptionNameMap() {
-        if (optionNameMapCache) {
-            return optionNameMapCache;
-        }
-        var optionNameMap = ts.createMap();
-        var shortOptionNames = ts.createMap();
-        ts.forEach(ts.optionDeclarations, function (option) {
-            optionNameMap.set(option.name.toLowerCase(), option);
-            if (option.shortName) {
-                shortOptionNames.set(option.shortName, option.name);
+            if (!compilerHost.fileExists(refPath)) {
+                return buildHost.error(ts.Diagnostics.File_0_does_not_exist, fileName);
             }
-        });
-        optionNameMapCache = { optionNameMap: optionNameMap, shortOptionNames: shortOptionNames };
-        return optionNameMapCache;
-    }
-    function createCompilerDiagnosticForInvalidCustomType(opt) {
-        return createDiagnosticForInvalidCustomType(opt, ts.createCompilerDiagnostic);
-    }
-    ts.createCompilerDiagnosticForInvalidCustomType = createCompilerDiagnosticForInvalidCustomType;
-    function createDiagnosticForInvalidCustomType(opt, createDiagnostic) {
-        var namesOfType = ts.arrayFrom(opt.type.keys()).map(function (key) { return "'" + key + "'"; }).join(", ");
-        return createDiagnostic(ts.Diagnostics.Argument_for_0_option_must_be_Colon_1, "--" + opt.name, namesOfType);
-    }
-    function parseCustomTypeOption(opt, value, errors) {
-        return convertJsonOptionOfCustomType(opt, trimString(value || ""), errors);
-    }
-    ts.parseCustomTypeOption = parseCustomTypeOption;
-    function parseListTypeOption(opt, value, errors) {
-        if (value === void 0) { value = ""; }
-        value = trimString(value);
-        if (ts.startsWith(value, "-")) {
-            return undefined;
-        }
-        if (value === "") {
-            return [];
-        }
-        var values = value.split(",");
-        switch (opt.element.type) {
-            case "number":
-                return ts.map(values, parseInt);
-            case "string":
-                return ts.map(values, function (v) { return v || ""; });
-            default:
-                return ts.mapDefined(values, function (v) { return parseCustomTypeOption(opt.element, v, errors); });
+            projects.push(refPath);
         }
     }
-    ts.parseListTypeOption = parseListTypeOption;
-    function parseCommandLine(commandLine, readFile) {
-        var options = {};
-        var fileNames = [];
-        var projectReferences = undefined;
-        var errors = [];
-        parseStrings(commandLine);
+    ts.performBuild = performBuild;
+    /**
+     * A SolutionBuilder has an immutable set of rootNames that are the "entry point" projects, but
+     * can dynamically add/remove other projects based on changes on the rootNames' references
+     */
+    function createSolutionBuilder(compilerHost, buildHost, rootNames, defaultOptions, system) {
+        if (!compilerHost.getModifiedTime || !compilerHost.setModifiedTime) {
+            throw new Error("Host must support timestamp APIs");
+        }
+        var configFileCache = createConfigFileCache(compilerHost);
+        var context = createBuildContext(defaultOptions);
+        var existingWatchersForWildcards = ts.createMap();
         return {
-            options: options,
-            fileNames: fileNames,
-            projectReferences: projectReferences,
-            errors: errors
+            buildAllProjects: buildAllProjects,
+            getUpToDateStatus: getUpToDateStatus,
+            getUpToDateStatusOfFile: getUpToDateStatusOfFile,
+            cleanAllProjects: cleanAllProjects,
+            resetBuildContext: resetBuildContext,
+            getBuildGraph: getBuildGraph,
+            invalidateProject: invalidateProject,
+            buildInvalidatedProjects: buildInvalidatedProjects,
+            buildDependentInvalidatedProjects: buildDependentInvalidatedProjects,
+            resolveProjectName: resolveProjectName,
+            startWatching: startWatching
         };
-        function parseStrings(args) {
-            var i = 0;
-            while (i < args.length) {
-                var s = args[i];
-                i++;
-                if (s.charCodeAt(0) === 64) {
-                    parseResponseFile(s.slice(1));
-                }
-                else if (s.charCodeAt(0) === 45) {
-                    var opt = getOptionFromName(s.slice(s.charCodeAt(1) === 45 ? 2 : 1), true);
-                    if (opt) {
-                        if (opt.isTSConfigOnly) {
-                            errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Option_0_can_only_be_specified_in_tsconfig_json_file, opt.name));
-                        }
-                        else {
-                            if (!args[i] && opt.type !== "boolean") {
-                                errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Compiler_option_0_expects_an_argument, opt.name));
-                            }
-                            switch (opt.type) {
-                                case "number":
-                                    options[opt.name] = parseInt(args[i]);
-                                    i++;
-                                    break;
-                                case "boolean":
-                                    var optValue = args[i];
-                                    options[opt.name] = optValue !== "false";
-                                    if (optValue === "false" || optValue === "true") {
-                                        i++;
-                                    }
-                                    break;
-                                case "string":
-                                    options[opt.name] = args[i] || "";
-                                    i++;
-                                    break;
-                                case "list":
-                                    var result = parseListTypeOption(opt, args[i], errors);
-                                    options[opt.name] = result || [];
-                                    if (result) {
-                                        i++;
-                                    }
-                                    break;
-                                default:
-                                    options[opt.name] = parseCustomTypeOption(opt, args[i], errors);
-                                    i++;
-                                    break;
-                            }
-                        }
-                    }
-                    else {
-                        errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Unknown_compiler_option_0, s));
-                    }
-                }
-                else {
-                    fileNames.push(s);
-                }
-            }
-        }
-        function parseResponseFile(fileName) {
-            var text = readFile ? readFile(fileName) : ts.sys.readFile(fileName);
-            if (!text) {
-                errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.File_0_not_found, fileName));
+        function startWatching() {
+            if (!system)
+                throw new Error("System host must be provided if using --watch");
+            if (!system.watchFile || !system.watchDirectory || !system.setTimeout)
+                throw new Error("System host must support watchFile / watchDirectory / setTimeout if using --watch");
+            var graph = getGlobalDependencyGraph();
+            if (!graph.buildQueue) {
+                // Everything is broken - we don't even know what to watch. Give up.
                 return;
             }
-            var args = [];
-            var pos = 0;
-            while (true) {
-                while (pos < text.length && text.charCodeAt(pos) <= 32)
-                    pos++;
-                if (pos >= text.length)
-                    break;
-                var start = pos;
-                if (text.charCodeAt(start) === 34) {
-                    pos++;
-                    while (pos < text.length && text.charCodeAt(pos) !== 34)
-                        pos++;
-                    if (pos < text.length) {
-                        args.push(text.substring(start + 1, pos));
-                        pos++;
-                    }
-                    else {
-                        errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Unterminated_quoted_string_in_response_file_0, fileName));
-                    }
-                }
-                else {
-                    while (text.charCodeAt(pos) > 32)
-                        pos++;
-                    args.push(text.substring(start, pos));
-                }
-            }
-            parseStrings(args);
-        }
-    }
-    ts.parseCommandLine = parseCommandLine;
-    function getOptionFromName(optionName, allowShort) {
-        if (allowShort === void 0) { allowShort = false; }
-        optionName = optionName.toLowerCase();
-        var _a = getOptionNameMap(), optionNameMap = _a.optionNameMap, shortOptionNames = _a.shortOptionNames;
-        if (allowShort) {
-            var short = shortOptionNames.get(optionName);
-            if (short !== undefined) {
-                optionName = short;
-            }
-        }
-        return optionNameMap.get(optionName);
-    }
-    ts.getOptionFromName = getOptionFromName;
-    function getParsedCommandLineOfConfigFile(configFileName, optionsToExtend, host) {
-        var configFileText;
-        try {
-            configFileText = host.readFile(configFileName);
-        }
-        catch (e) {
-            var error = ts.createCompilerDiagnostic(ts.Diagnostics.Cannot_read_file_0_Colon_1, configFileName, e.message);
-            host.onUnRecoverableConfigFileDiagnostic(error);
-            return undefined;
-        }
-        if (!configFileText) {
-            var error = ts.createCompilerDiagnostic(ts.Diagnostics.File_0_not_found, configFileName);
-            host.onUnRecoverableConfigFileDiagnostic(error);
-            return undefined;
-        }
-        var result = ts.parseJsonText(configFileName, configFileText);
-        var cwd = host.getCurrentDirectory();
-        return parseJsonSourceFileConfigFileContent(result, host, ts.getNormalizedAbsolutePath(ts.getDirectoryPath(configFileName), cwd), optionsToExtend, ts.getNormalizedAbsolutePath(configFileName, cwd));
-    }
-    ts.getParsedCommandLineOfConfigFile = getParsedCommandLineOfConfigFile;
-    function readConfigFile(fileName, readFile) {
-        var textOrDiagnostic = tryReadFile(fileName, readFile);
-        return ts.isString(textOrDiagnostic) ? parseConfigFileTextToJson(fileName, textOrDiagnostic) : { config: {}, error: textOrDiagnostic };
-    }
-    ts.readConfigFile = readConfigFile;
-    function parseConfigFileTextToJson(fileName, jsonText) {
-        var jsonSourceFile = ts.parseJsonText(fileName, jsonText);
-        return {
-            config: convertToObject(jsonSourceFile, jsonSourceFile.parseDiagnostics),
-            error: jsonSourceFile.parseDiagnostics.length ? jsonSourceFile.parseDiagnostics[0] : undefined
-        };
-    }
-    ts.parseConfigFileTextToJson = parseConfigFileTextToJson;
-    function readJsonConfigFile(fileName, readFile) {
-        var textOrDiagnostic = tryReadFile(fileName, readFile);
-        return ts.isString(textOrDiagnostic) ? ts.parseJsonText(fileName, textOrDiagnostic) : { parseDiagnostics: [textOrDiagnostic] };
-    }
-    ts.readJsonConfigFile = readJsonConfigFile;
-    function tryReadFile(fileName, readFile) {
-        var text;
-        try {
-            text = readFile(fileName);
-        }
-        catch (e) {
-            return ts.createCompilerDiagnostic(ts.Diagnostics.Cannot_read_file_0_Colon_1, fileName, e.message);
-        }
-        return text === undefined ? ts.createCompilerDiagnostic(ts.Diagnostics.The_specified_path_does_not_exist_Colon_0, fileName) : text;
-    }
-    function commandLineOptionsToMap(options) {
-        return ts.arrayToMap(options, function (option) { return option.name; });
-    }
-    var _tsconfigRootOptions;
-    function getTsconfigRootOptionsMap() {
-        if (_tsconfigRootOptions === undefined) {
-            _tsconfigRootOptions = {
-                name: undefined,
-                type: "object",
-                elementOptions: commandLineOptionsToMap([
-                    {
-                        name: "compilerOptions",
-                        type: "object",
-                        elementOptions: commandLineOptionsToMap(ts.optionDeclarations),
-                        extraKeyDiagnosticMessage: ts.Diagnostics.Unknown_compiler_option_0
-                    },
-                    {
-                        name: "typingOptions",
-                        type: "object",
-                        elementOptions: commandLineOptionsToMap(ts.typeAcquisitionDeclarations),
-                        extraKeyDiagnosticMessage: ts.Diagnostics.Unknown_type_acquisition_option_0
-                    },
-                    {
-                        name: "typeAcquisition",
-                        type: "object",
-                        elementOptions: commandLineOptionsToMap(ts.typeAcquisitionDeclarations),
-                        extraKeyDiagnosticMessage: ts.Diagnostics.Unknown_type_acquisition_option_0
-                    },
-                    {
-                        name: "extends",
-                        type: "string"
-                    },
-                    {
-                        name: "references",
-                        type: "list",
-                        element: {
-                            name: "references",
-                            type: "object"
-                        }
-                    },
-                    {
-                        name: "files",
-                        type: "list",
-                        element: {
-                            name: "files",
-                            type: "string"
-                        }
-                    },
-                    {
-                        name: "include",
-                        type: "list",
-                        element: {
-                            name: "include",
-                            type: "string"
-                        }
-                    },
-                    {
-                        name: "exclude",
-                        type: "list",
-                        element: {
-                            name: "exclude",
-                            type: "string"
-                        }
-                    },
-                    ts.compileOnSaveCommandLineOption
-                ])
-            };
-        }
-        return _tsconfigRootOptions;
-    }
-    function convertToObject(sourceFile, errors) {
-        return convertToObjectWorker(sourceFile, errors, true, undefined, undefined);
-    }
-    ts.convertToObject = convertToObject;
-    function convertToObjectWorker(sourceFile, errors, returnValue, knownRootOptions, jsonConversionNotifier) {
-        if (!sourceFile.statements.length) {
-            return returnValue ? {} : undefined;
-        }
-        return convertPropertyValueToJson(sourceFile.statements[0].expression, knownRootOptions);
-        function isRootOptionMap(knownOptions) {
-            return knownRootOptions && knownRootOptions.elementOptions === knownOptions;
-        }
-        function convertObjectLiteralExpressionToJson(node, knownOptions, extraKeyDiagnosticMessage, parentOption) {
-            var result = returnValue ? {} : undefined;
-            for (var _i = 0, _a = node.properties; _i < _a.length; _i++) {
-                var element = _a[_i];
-                if (element.kind !== 270) {
-                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, element, ts.Diagnostics.Property_assignment_expected));
-                    continue;
-                }
-                if (element.questionToken) {
-                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, element.questionToken, ts.Diagnostics._0_can_only_be_used_in_a_ts_file, "?"));
-                }
-                if (!isDoubleQuotedString(element.name)) {
-                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, element.name, ts.Diagnostics.String_literal_with_double_quotes_expected));
-                }
-                var keyText = ts.unescapeLeadingUnderscores(ts.getTextOfPropertyName(element.name));
-                var option = knownOptions ? knownOptions.get(keyText) : undefined;
-                if (extraKeyDiagnosticMessage && !option) {
-                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, element.name, extraKeyDiagnosticMessage, keyText));
-                }
-                var value = convertPropertyValueToJson(element.initializer, option);
-                if (typeof keyText !== "undefined") {
-                    if (returnValue) {
-                        result[keyText] = value;
-                    }
-                    if (jsonConversionNotifier &&
-                        (parentOption || isRootOptionMap(knownOptions))) {
-                        var isValidOptionValue = isCompilerOptionsValue(option, value);
-                        if (parentOption) {
-                            if (isValidOptionValue) {
-                                jsonConversionNotifier.onSetValidOptionKeyValueInParent(parentOption, option, value);
-                            }
-                        }
-                        else if (isRootOptionMap(knownOptions)) {
-                            if (isValidOptionValue) {
-                                jsonConversionNotifier.onSetValidOptionKeyValueInRoot(keyText, element.name, value, element.initializer);
-                            }
-                            else if (!option) {
-                                jsonConversionNotifier.onSetUnknownOptionKeyValueInRoot(keyText, element.name, value, element.initializer);
-                            }
-                        }
-                    }
-                }
-            }
-            return result;
-        }
-        function convertArrayLiteralExpressionToJson(elements, elementOption) {
-            return (returnValue ? elements.map : elements.forEach).call(elements, function (element) { return convertPropertyValueToJson(element, elementOption); });
-        }
-        function convertPropertyValueToJson(valueExpression, option) {
-            switch (valueExpression.kind) {
-                case 101:
-                    reportInvalidOptionValue(option && option.type !== "boolean");
-                    return true;
-                case 86:
-                    reportInvalidOptionValue(option && option.type !== "boolean");
-                    return false;
-                case 95:
-                    reportInvalidOptionValue(option && option.name === "extends");
-                    return null;
-                case 9:
-                    if (!isDoubleQuotedString(valueExpression)) {
-                        errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, valueExpression, ts.Diagnostics.String_literal_with_double_quotes_expected));
-                    }
-                    reportInvalidOptionValue(option && (ts.isString(option.type) && option.type !== "string"));
-                    var text = valueExpression.text;
-                    if (option && !ts.isString(option.type)) {
-                        var customOption = option;
-                        if (!customOption.type.has(text.toLowerCase())) {
-                            errors.push(createDiagnosticForInvalidCustomType(customOption, function (message, arg0, arg1) { return ts.createDiagnosticForNodeInSourceFile(sourceFile, valueExpression, message, arg0, arg1); }));
-                        }
-                    }
-                    return text;
-                case 8:
-                    reportInvalidOptionValue(option && option.type !== "number");
-                    return Number(valueExpression.text);
-                case 198:
-                    if (valueExpression.operator !== 38 || valueExpression.operand.kind !== 8) {
-                        break;
-                    }
-                    reportInvalidOptionValue(option && option.type !== "number");
-                    return -Number(valueExpression.operand.text);
-                case 184:
-                    reportInvalidOptionValue(option && option.type !== "object");
-                    var objectLiteralExpression = valueExpression;
-                    if (option) {
-                        var _a = option, elementOptions = _a.elementOptions, extraKeyDiagnosticMessage = _a.extraKeyDiagnosticMessage, optionName = _a.name;
-                        return convertObjectLiteralExpressionToJson(objectLiteralExpression, elementOptions, extraKeyDiagnosticMessage, optionName);
-                    }
-                    else {
-                        return convertObjectLiteralExpressionToJson(objectLiteralExpression, undefined, undefined, undefined);
-                    }
-                case 183:
-                    reportInvalidOptionValue(option && option.type !== "list");
-                    return convertArrayLiteralExpressionToJson(valueExpression.elements, option && option.element);
-            }
-            if (option) {
-                reportInvalidOptionValue(true);
-            }
-            else {
-                errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, valueExpression, ts.Diagnostics.Property_value_can_only_be_string_literal_numeric_literal_true_false_null_object_literal_or_array_literal));
-            }
-            return undefined;
-            function reportInvalidOptionValue(isError) {
-                if (isError) {
-                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, valueExpression, ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, option.name, getCompilerOptionValueTypeString(option)));
-                }
-            }
-        }
-        function isDoubleQuotedString(node) {
-            return ts.isStringLiteral(node) && ts.isStringDoubleQuoted(node, sourceFile);
-        }
-    }
-    ts.convertToObjectWorker = convertToObjectWorker;
-    function getCompilerOptionValueTypeString(option) {
-        return option.type === "list" ?
-            "Array" :
-            ts.isString(option.type) ? option.type : "string";
-    }
-    function isCompilerOptionsValue(option, value) {
-        if (option) {
-            if (isNullOrUndefined(value))
-                return true;
-            if (option.type === "list") {
-                return ts.isArray(value);
-            }
-            var expectedType = ts.isString(option.type) ? option.type : "string";
-            return typeof value === expectedType;
-        }
-        return false;
-    }
-    function generateTSConfig(options, fileNames, newLine) {
-        var compilerOptions = ts.extend(options, ts.defaultInitCompilerOptions);
-        var compilerOptionsMap = serializeCompilerOptions(compilerOptions);
-        return writeConfigurations();
-        function getCustomTypeMapOfCommandLineOption(optionDefinition) {
-            if (optionDefinition.type === "string" || optionDefinition.type === "number" || optionDefinition.type === "boolean") {
-                return undefined;
-            }
-            else if (optionDefinition.type === "list") {
-                return getCustomTypeMapOfCommandLineOption(optionDefinition.element);
-            }
-            else {
-                return optionDefinition.type;
-            }
-        }
-        function getNameOfCompilerOptionValue(value, customTypeMap) {
-            return ts.forEachEntry(customTypeMap, function (mapValue, key) {
-                if (mapValue === value) {
-                    return key;
-                }
-            });
-        }
-        function serializeCompilerOptions(options) {
-            var result = ts.createMap();
-            var optionsNameMap = getOptionNameMap().optionNameMap;
-            var _loop_11 = function (name) {
-                if (ts.hasProperty(options, name)) {
-                    if (optionsNameMap.has(name) && optionsNameMap.get(name).category === ts.Diagnostics.Command_line_Options) {
-                        return "continue";
-                    }
-                    var value = options[name];
-                    var optionDefinition = optionsNameMap.get(name.toLowerCase());
-                    if (optionDefinition) {
-                        var customTypeMap_1 = getCustomTypeMapOfCommandLineOption(optionDefinition);
-                        if (!customTypeMap_1) {
-                            result.set(name, value);
-                        }
-                        else {
-                            if (optionDefinition.type === "list") {
-                                result.set(name, value.map(function (element) { return getNameOfCompilerOptionValue(element, customTypeMap_1); }));
-                            }
-                            else {
-                                result.set(name, getNameOfCompilerOptionValue(value, customTypeMap_1));
-                            }
-                        }
-                    }
-                }
-            };
-            for (var name in options) {
-                _loop_11(name);
-            }
-            return result;
-        }
-        function getDefaultValueForOption(option) {
-            switch (option.type) {
-                case "number":
-                    return 1;
-                case "boolean":
-                    return true;
-                case "string":
-                    return option.isFilePath ? "./" : "";
-                case "list":
-                    return [];
-                case "object":
-                    return {};
-                default:
-                    return option.type.keys().next().value;
-            }
-        }
-        function makePadding(paddingLength) {
-            return Array(paddingLength + 1).join(" ");
-        }
-        function isAllowedOption(_a) {
-            var category = _a.category, name = _a.name;
-            return category !== undefined
-                && category !== ts.Diagnostics.Command_line_Options
-                && (category !== ts.Diagnostics.Advanced_Options || compilerOptionsMap.has(name));
-        }
-        function writeConfigurations() {
-            var categorizedOptions = ts.createMultiMap();
-            for (var _i = 0, optionDeclarations_1 = ts.optionDeclarations; _i < optionDeclarations_1.length; _i++) {
-                var option = optionDeclarations_1[_i];
-                var category = option.category;
-                if (isAllowedOption(option)) {
-                    categorizedOptions.add(ts.getLocaleSpecificMessage(category), option);
-                }
-            }
-            var marginLength = 0;
-            var seenKnownKeys = 0;
-            var nameColumn = [];
-            var descriptionColumn = [];
-            categorizedOptions.forEach(function (options, category) {
-                if (nameColumn.length !== 0) {
-                    nameColumn.push("");
-                    descriptionColumn.push("");
-                }
-                nameColumn.push("/* " + category + " */");
-                descriptionColumn.push("");
-                for (var _i = 0, options_1 = options; _i < options_1.length; _i++) {
-                    var option = options_1[_i];
-                    var optionName = void 0;
-                    if (compilerOptionsMap.has(option.name)) {
-                        optionName = "\"" + option.name + "\": " + JSON.stringify(compilerOptionsMap.get(option.name)) + ((seenKnownKeys += 1) === compilerOptionsMap.size ? "" : ",");
-                    }
-                    else {
-                        optionName = "// \"" + option.name + "\": " + JSON.stringify(getDefaultValueForOption(option)) + ",";
-                    }
-                    nameColumn.push(optionName);
-                    descriptionColumn.push("/* " + (option.description && ts.getLocaleSpecificMessage(option.description) || option.name) + " */");
-                    marginLength = Math.max(optionName.length, marginLength);
-                }
-            });
-            var tab = makePadding(2);
-            var result = [];
-            result.push("{");
-            result.push(tab + "\"compilerOptions\": {");
-            for (var i = 0; i < nameColumn.length; i++) {
-                var optionName = nameColumn[i];
-                var description = descriptionColumn[i];
-                result.push(optionName && "" + tab + tab + optionName + (description && (makePadding(marginLength - optionName.length + 2) + description)));
-            }
-            if (fileNames.length) {
-                result.push(tab + "},");
-                result.push(tab + "\"files\": [");
-                for (var i = 0; i < fileNames.length; i++) {
-                    result.push("" + tab + tab + JSON.stringify(fileNames[i]) + (i === fileNames.length - 1 ? "" : ","));
-                }
-                result.push(tab + "]");
-            }
-            else {
-                result.push(tab + "}");
-            }
-            result.push("}");
-            return result.join(newLine);
-        }
-    }
-    ts.generateTSConfig = generateTSConfig;
-    function parseJsonConfigFileContent(json, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions) {
-        return parseJsonConfigFileContentWorker(json, undefined, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions);
-    }
-    ts.parseJsonConfigFileContent = parseJsonConfigFileContent;
-    function parseJsonSourceFileConfigFileContent(sourceFile, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions) {
-        return parseJsonConfigFileContentWorker(undefined, sourceFile, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions);
-    }
-    ts.parseJsonSourceFileConfigFileContent = parseJsonSourceFileConfigFileContent;
-    function setConfigFileInOptions(options, configFile) {
-        if (configFile) {
-            Object.defineProperty(options, "configFile", { enumerable: false, writable: false, value: configFile });
-        }
-    }
-    ts.setConfigFileInOptions = setConfigFileInOptions;
-    function isNullOrUndefined(x) {
-        return x === undefined || x === null;
-    }
-    function directoryOfCombinedPath(fileName, basePath) {
-        return ts.getDirectoryPath(ts.getNormalizedAbsolutePath(fileName, basePath));
-    }
-    function parseJsonConfigFileContentWorker(json, sourceFile, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions) {
-        if (existingOptions === void 0) { existingOptions = {}; }
-        if (resolutionStack === void 0) { resolutionStack = []; }
-        if (extraFileExtensions === void 0) { extraFileExtensions = []; }
-        ts.Debug.assert((json === undefined && sourceFile !== undefined) || (json !== undefined && sourceFile === undefined));
-        var errors = [];
-        var parsedConfig = parseConfig(json, sourceFile, host, basePath, configFileName, resolutionStack, errors);
-        var raw = parsedConfig.raw;
-        var options = ts.extend(existingOptions, parsedConfig.options || {});
-        options.configFilePath = configFileName && ts.normalizeSlashes(configFileName);
-        setConfigFileInOptions(options, sourceFile);
-        var _a = getFileNames(), fileNames = _a.fileNames, wildcardDirectories = _a.wildcardDirectories, spec = _a.spec, projectReferences = _a.projectReferences;
-        return {
-            options: options,
-            fileNames: fileNames,
-            projectReferences: projectReferences,
-            typeAcquisition: parsedConfig.typeAcquisition || getDefaultTypeAcquisition(),
-            raw: raw,
-            errors: errors,
-            wildcardDirectories: wildcardDirectories,
-            compileOnSave: !!raw.compileOnSave,
-            configFileSpecs: spec
-        };
-        function getFileNames() {
-            var filesSpecs;
-            if (ts.hasProperty(raw, "files") && !isNullOrUndefined(raw.files)) {
-                if (ts.isArray(raw.files)) {
-                    filesSpecs = raw.files;
-                    if (filesSpecs.length === 0) {
-                        createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.The_files_list_in_config_file_0_is_empty, configFileName || "tsconfig.json");
-                    }
-                }
-                else {
-                    createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "files", "Array");
-                }
-            }
-            var includeSpecs;
-            if (ts.hasProperty(raw, "include") && !isNullOrUndefined(raw.include)) {
-                if (ts.isArray(raw.include)) {
-                    includeSpecs = raw.include;
-                }
-                else {
-                    createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "include", "Array");
-                }
-            }
-            var excludeSpecs;
-            if (ts.hasProperty(raw, "exclude") && !isNullOrUndefined(raw.exclude)) {
-                if (ts.isArray(raw.exclude)) {
-                    excludeSpecs = raw.exclude;
-                }
-                else {
-                    createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "exclude", "Array");
-                }
-            }
-            else if (raw.compilerOptions) {
-                var outDir = raw.compilerOptions.outDir;
-                var declarationDir = raw.compilerOptions.declarationDir;
-                if (outDir || declarationDir) {
-                    excludeSpecs = [outDir, declarationDir].filter(function (d) { return !!d; });
-                }
-            }
-            if (filesSpecs === undefined && includeSpecs === undefined) {
-                includeSpecs = ["**/*"];
-            }
-            var result = matchFileNames(filesSpecs, includeSpecs, excludeSpecs, configFileName ? directoryOfCombinedPath(configFileName, basePath) : basePath, options, host, errors, extraFileExtensions, sourceFile);
-            if (result.fileNames.length === 0 && !ts.hasProperty(raw, "files") && resolutionStack.length === 0 && !ts.hasProperty(raw, "references")) {
-                errors.push(getErrorForNoInputFiles(result.spec, configFileName));
-            }
-            if (ts.hasProperty(raw, "references") && !isNullOrUndefined(raw.references)) {
-                if (ts.isArray(raw.references)) {
-                    var references = [];
-                    for (var _i = 0, _a = raw.references; _i < _a.length; _i++) {
-                        var ref = _a[_i];
-                        if (typeof ref.path !== "string") {
-                            createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "reference.path", "string");
-                        }
-                        else {
-                            references.push({
-                                path: ts.getNormalizedAbsolutePath(ref.path, basePath),
-                                originalPath: ref.path,
-                                prepend: ref.prepend,
-                                circular: ref.circular
-                            });
-                        }
-                    }
-                    result.projectReferences = references;
-                }
-                else {
-                    createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "references", "Array");
-                }
-            }
-            return result;
-        }
-        function createCompilerDiagnosticOnlyIfJson(message, arg0, arg1) {
-            if (!sourceFile) {
-                errors.push(ts.createCompilerDiagnostic(message, arg0, arg1));
-            }
-        }
-    }
-    function isErrorNoInputFiles(error) {
-        return error.code === ts.Diagnostics.No_inputs_were_found_in_config_file_0_Specified_include_paths_were_1_and_exclude_paths_were_2.code;
-    }
-    ts.isErrorNoInputFiles = isErrorNoInputFiles;
-    function getErrorForNoInputFiles(_a, configFileName) {
-        var includeSpecs = _a.includeSpecs, excludeSpecs = _a.excludeSpecs;
-        return ts.createCompilerDiagnostic(ts.Diagnostics.No_inputs_were_found_in_config_file_0_Specified_include_paths_were_1_and_exclude_paths_were_2, configFileName || "tsconfig.json", JSON.stringify(includeSpecs || []), JSON.stringify(excludeSpecs || []));
-    }
-    ts.getErrorForNoInputFiles = getErrorForNoInputFiles;
-    function isSuccessfulParsedTsconfig(value) {
-        return !!value.options;
-    }
-    function parseConfig(json, sourceFile, host, basePath, configFileName, resolutionStack, errors) {
-        basePath = ts.normalizeSlashes(basePath);
-        var resolvedPath = ts.getNormalizedAbsolutePath(configFileName || "", basePath);
-        if (resolutionStack.indexOf(resolvedPath) >= 0) {
-            errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Circularity_detected_while_resolving_configuration_Colon_0, resolutionStack.concat([resolvedPath]).join(" -> ")));
-            return { raw: json || convertToObject(sourceFile, errors) };
-        }
-        var ownConfig = json ?
-            parseOwnConfigOfJson(json, host, basePath, configFileName, errors) :
-            parseOwnConfigOfJsonSourceFile(sourceFile, host, basePath, configFileName, errors);
-        if (ownConfig.extendedConfigPath) {
-            resolutionStack = resolutionStack.concat([resolvedPath]);
-            var extendedConfig = getExtendedConfig(sourceFile, ownConfig.extendedConfigPath, host, basePath, resolutionStack, errors);
-            if (extendedConfig && isSuccessfulParsedTsconfig(extendedConfig)) {
-                var baseRaw_1 = extendedConfig.raw;
-                var raw_1 = ownConfig.raw;
-                var setPropertyInRawIfNotUndefined = function (propertyName) {
-                    var value = raw_1[propertyName] || baseRaw_1[propertyName];
-                    if (value) {
-                        raw_1[propertyName] = value;
-                    }
-                };
-                setPropertyInRawIfNotUndefined("include");
-                setPropertyInRawIfNotUndefined("exclude");
-                setPropertyInRawIfNotUndefined("files");
-                if (raw_1.compileOnSave === undefined) {
-                    raw_1.compileOnSave = baseRaw_1.compileOnSave;
-                }
-                ownConfig.options = ts.assign({}, extendedConfig.options, ownConfig.options);
-            }
-        }
-        return ownConfig;
-    }
-    function parseOwnConfigOfJson(json, host, basePath, configFileName, errors) {
-        if (ts.hasProperty(json, "excludes")) {
-            errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Unknown_option_excludes_Did_you_mean_exclude));
-        }
-        var options = convertCompilerOptionsFromJsonWorker(json.compilerOptions, basePath, errors, configFileName);
-        var typeAcquisition = convertTypeAcquisitionFromJsonWorker(json.typeAcquisition || json.typingOptions, basePath, errors, configFileName);
-        json.compileOnSave = convertCompileOnSaveOptionFromJson(json, basePath, errors);
-        var extendedConfigPath;
-        if (json.extends) {
-            if (!ts.isString(json.extends)) {
-                errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "extends", "string"));
-            }
-            else {
-                var newBase = configFileName ? directoryOfCombinedPath(configFileName, basePath) : basePath;
-                extendedConfigPath = getExtendsConfigPath(json.extends, host, newBase, errors, ts.createCompilerDiagnostic);
-            }
-        }
-        return { raw: json, options: options, typeAcquisition: typeAcquisition, extendedConfigPath: extendedConfigPath };
-    }
-    function parseOwnConfigOfJsonSourceFile(sourceFile, host, basePath, configFileName, errors) {
-        var options = getDefaultCompilerOptions(configFileName);
-        var typeAcquisition, typingOptionstypeAcquisition;
-        var extendedConfigPath;
-        var optionsIterator = {
-            onSetValidOptionKeyValueInParent: function (parentOption, option, value) {
-                ts.Debug.assert(parentOption === "compilerOptions" || parentOption === "typeAcquisition" || parentOption === "typingOptions");
-                var currentOption = parentOption === "compilerOptions" ?
-                    options :
-                    parentOption === "typeAcquisition" ?
-                        (typeAcquisition || (typeAcquisition = getDefaultTypeAcquisition(configFileName))) :
-                        (typingOptionstypeAcquisition || (typingOptionstypeAcquisition = getDefaultTypeAcquisition(configFileName)));
-                currentOption[option.name] = normalizeOptionValue(option, basePath, value);
-            },
-            onSetValidOptionKeyValueInRoot: function (key, _keyNode, value, valueNode) {
-                switch (key) {
-                    case "extends":
-                        var newBase = configFileName ? directoryOfCombinedPath(configFileName, basePath) : basePath;
-                        extendedConfigPath = getExtendsConfigPath(value, host, newBase, errors, function (message, arg0) {
-                            return ts.createDiagnosticForNodeInSourceFile(sourceFile, valueNode, message, arg0);
+            var _loop_9 = function (resolved) {
+                var cfg = configFileCache.parseConfigFile(resolved);
+                if (cfg) {
+                    // Watch this file
+                    system.watchFile(resolved, function () {
+                        configFileCache.removeKey(resolved);
+                        invalidateProjectAndScheduleBuilds(resolved);
+                    });
+                    // Update watchers for wildcard directories
+                    if (cfg.configFileSpecs) {
+                        ts.updateWatchingWildcardDirectories(existingWatchersForWildcards, ts.createMapFromTemplate(cfg.configFileSpecs.wildcardDirectories), function (dir, flags) {
+                            return system.watchDirectory(dir, function () {
+                                invalidateProjectAndScheduleBuilds(resolved);
+                            }, !!(flags & 1 /* Recursive */));
                         });
-                        return;
-                    case "files":
-                        if (value.length === 0) {
-                            errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, valueNode, ts.Diagnostics.The_files_list_in_config_file_0_is_empty, configFileName || "tsconfig.json"));
-                        }
-                        return;
+                    }
+                    // Watch input files
+                    for (var _i = 0, _a = cfg.fileNames; _i < _a.length; _i++) {
+                        var input = _a[_i];
+                        system.watchFile(input, function () {
+                            invalidateProjectAndScheduleBuilds(resolved);
+                        });
+                    }
                 }
-            },
-            onSetUnknownOptionKeyValueInRoot: function (key, keyNode, _value, _valueNode) {
-                if (key === "excludes") {
-                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, keyNode, ts.Diagnostics.Unknown_option_excludes_Did_you_mean_exclude));
+            };
+            for (var _i = 0, _a = graph.buildQueue; _i < _a.length; _i++) {
+                var resolved = _a[_i];
+                _loop_9(resolved);
+            }
+            function invalidateProjectAndScheduleBuilds(resolved) {
+                invalidateProject(resolved);
+                system.setTimeout(buildInvalidatedProjects, 100);
+                system.setTimeout(buildDependentInvalidatedProjects, 3000);
+            }
+        }
+        function resetBuildContext(opts) {
+            if (opts === void 0) { opts = defaultOptions; }
+            context = createBuildContext(opts);
+        }
+        function getUpToDateStatusOfFile(configFileName) {
+            return getUpToDateStatus(configFileCache.parseConfigFile(configFileName));
+        }
+        function getBuildGraph(configFileNames) {
+            var resolvedNames = resolveProjectNames(configFileNames);
+            if (resolvedNames === undefined)
+                return undefined;
+            return createDependencyGraph(resolvedNames);
+        }
+        function getGlobalDependencyGraph() {
+            return getBuildGraph(rootNames);
+        }
+        function getUpToDateStatus(project) {
+            if (project === undefined) {
+                return { type: UpToDateStatusType.Unbuildable, reason: "File deleted mid-build" };
+            }
+            var prior = context.projectStatus.getValueOrUndefined(project.options.configFilePath);
+            if (prior !== undefined) {
+                return prior;
+            }
+            var actual = getUpToDateStatusWorker(project);
+            context.projectStatus.setValue(project.options.configFilePath, actual);
+            return actual;
+        }
+        function invalidateProject(configFileName) {
+            var resolved = resolveProjectName(configFileName);
+            if (resolved === undefined) {
+                // If this was a rootName, we need to track it as missing.
+                // Otherwise we can just ignore it and have it possibly surface as an error in any downstream projects,
+                // if they exist
+                // TODO: do those things
+                return;
+            }
+            configFileCache.removeKey(resolved);
+            context.invalidatedProjects.setValue(resolved, true);
+            context.projectStatus.removeKey(resolved);
+            var graph = getGlobalDependencyGraph();
+            if (graph) {
+                queueBuildForDownstreamReferences(resolved);
+            }
+            // Mark all downstream projects of this one needing to be built "later"
+            function queueBuildForDownstreamReferences(root) {
+                debugger;
+                var deps = graph.dependencyMap.getReferencesTo(root);
+                for (var _i = 0, deps_1 = deps; _i < deps_1.length; _i++) {
+                    var ref = deps_1[_i];
+                    // Can skip circular references
+                    if (!context.queuedProjects.hasKey(ref)) {
+                        context.queuedProjects.setValue(ref, true);
+                        queueBuildForDownstreamReferences(ref);
+                    }
                 }
             }
-        };
-        var json = convertToObjectWorker(sourceFile, errors, true, getTsconfigRootOptionsMap(), optionsIterator);
-        if (!typeAcquisition) {
-            if (typingOptionstypeAcquisition) {
-                typeAcquisition = (typingOptionstypeAcquisition.enableAutoDiscovery !== undefined) ?
-                    {
-                        enable: typingOptionstypeAcquisition.enableAutoDiscovery,
-                        include: typingOptionstypeAcquisition.include,
-                        exclude: typingOptionstypeAcquisition.exclude
-                    } :
-                    typingOptionstypeAcquisition;
+        }
+        function buildInvalidatedProjects() {
+            buildSomeProjects(function (p) { return context.invalidatedProjects.hasKey(p); });
+        }
+        function buildDependentInvalidatedProjects() {
+            buildSomeProjects(function (p) { return context.queuedProjects.hasKey(p); });
+        }
+        function buildSomeProjects(predicate) {
+            var resolvedNames = resolveProjectNames(rootNames);
+            if (resolvedNames === undefined)
+                return;
+            var graph = createDependencyGraph(resolvedNames);
+            for (var _i = 0, _a = graph.buildQueue; _i < _a.length; _i++) {
+                var next = _a[_i];
+                if (!predicate(next))
+                    continue;
+                var resolved = resolveProjectName(next);
+                if (!resolved)
+                    continue; // ??
+                var proj = configFileCache.parseConfigFile(resolved);
+                if (!proj)
+                    continue; // ?
+                var status = getUpToDateStatus(proj);
+                verboseReportProjectStatus(next, status);
+                if (status.type === UpToDateStatusType.UpstreamBlocked) {
+                    if (context.options.verbose)
+                        buildHost.verbose(ts.Diagnostics.Skipping_build_of_project_0_because_its_dependency_1_has_errors, resolved, status.upstreamProjectName);
+                    continue;
+                }
+                buildSingleProject(next);
+            }
+        }
+        function getAllProjectOutputs(project) {
+            if (project.options.outFile) {
+                return getOutFileOutputs(project);
             }
             else {
-                typeAcquisition = getDefaultTypeAcquisition(configFileName);
+                var outputs = [];
+                for (var _i = 0, _a = project.fileNames; _i < _a.length; _i++) {
+                    var inputFile = _a[_i];
+                    outputs.push.apply(outputs, getOutputFileNames(inputFile, project));
+                }
+                return outputs;
             }
         }
-        return { raw: json, options: options, typeAcquisition: typeAcquisition, extendedConfigPath: extendedConfigPath };
-    }
-    function getExtendsConfigPath(extendedConfig, host, basePath, errors, createDiagnostic) {
-        extendedConfig = ts.normalizeSlashes(extendedConfig);
-        if (!(ts.isRootedDiskPath(extendedConfig) || ts.startsWith(extendedConfig, "./") || ts.startsWith(extendedConfig, "../"))) {
-            errors.push(createDiagnostic(ts.Diagnostics.A_path_in_an_extends_option_must_be_relative_or_rooted_but_0_is_not, extendedConfig));
-            return undefined;
+        function getUpToDateStatusWorker(project) {
+            var newestInputFileName = undefined;
+            var newestInputFileTime = minimumDate;
+            // Get timestamps of input files
+            for (var _i = 0, _a = project.fileNames; _i < _a.length; _i++) {
+                var inputFile = _a[_i];
+                if (!compilerHost.fileExists(inputFile)) {
+                    return {
+                        type: UpToDateStatusType.Unbuildable,
+                        reason: inputFile + " does not exist"
+                    };
+                }
+                var inputTime = compilerHost.getModifiedTime(inputFile);
+                if (inputTime > newestInputFileTime) {
+                    newestInputFileName = inputFile;
+                    newestInputFileTime = inputTime;
+                }
+            }
+            // Collect the expected outputs of this project
+            var outputs = getAllProjectOutputs(project);
+            if (outputs.length === 0) {
+                return {
+                    type: UpToDateStatusType.ContainerOnly
+                };
+            }
+            // Now see if all outputs are newer than the newest input
+            var oldestOutputFileName = "(none)";
+            var oldestOutputFileTime = maximumDate;
+            var newestOutputFileName = "(none)";
+            var newestOutputFileTime = minimumDate;
+            var missingOutputFileName;
+            var newestDeclarationFileContentChangedTime = minimumDate;
+            var isOutOfDateWithInputs = false;
+            for (var _b = 0, outputs_1 = outputs; _b < outputs_1.length; _b++) {
+                var output = outputs_1[_b];
+                // Output is missing; can stop checking
+                // Don't immediately return because we can still be upstream-blocked, which is a higher-priority status
+                if (!compilerHost.fileExists(output)) {
+                    missingOutputFileName = output;
+                    break;
+                }
+                var outputTime = compilerHost.getModifiedTime(output);
+                if (outputTime < oldestOutputFileTime) {
+                    oldestOutputFileTime = outputTime;
+                    oldestOutputFileName = output;
+                }
+                // If an output is older than the newest input, we can stop checking
+                // Don't immediately return because we can still be upstream-blocked, which is a higher-priority status
+                if (outputTime < newestInputFileTime) {
+                    isOutOfDateWithInputs = true;
+                    break;
+                }
+                if (outputTime > newestOutputFileTime) {
+                    newestOutputFileTime = outputTime;
+                    newestOutputFileName = output;
+                }
+                // Keep track of when the most recent time a .d.ts file was changed.
+                // In addition to file timestamps, we also keep track of when a .d.ts file
+                // had its file touched but not had its contents changed - this allows us
+                // to skip a downstream typecheck
+                if (isDeclarationFile(output)) {
+                    var unchangedTime = context.unchangedOutputs.getValueOrUndefined(output);
+                    if (unchangedTime !== undefined) {
+                        newestDeclarationFileContentChangedTime = newer(unchangedTime, newestDeclarationFileContentChangedTime);
+                    }
+                    else {
+                        newestDeclarationFileContentChangedTime = newer(newestDeclarationFileContentChangedTime, compilerHost.getModifiedTime(output));
+                    }
+                }
+            }
+            var pseudoUpToDate = false;
+            if (project.projectReferences) {
+                for (var _c = 0, _d = project.projectReferences; _c < _d.length; _c++) {
+                    var ref = _d[_c];
+                    var resolvedRef = ts.resolveProjectReferencePath(compilerHost, ref);
+                    var refStatus = getUpToDateStatus(configFileCache.parseConfigFile(resolvedRef));
+                    // An upstream project is blocked
+                    if (refStatus.type === UpToDateStatusType.Unbuildable) {
+                        return {
+                            type: UpToDateStatusType.UpstreamBlocked,
+                            upstreamProjectName: ref.path
+                        };
+                    }
+                    // If the upstream project is out of date, then so are we (someone shouldn't have asked, though?)
+                    if (refStatus.type !== UpToDateStatusType.UpToDate) {
+                        return {
+                            type: UpToDateStatusType.UpstreamOutOfDate,
+                            upstreamProjectName: ref.path
+                        };
+                    }
+                    // If the upstream project's newest file is older than our oldest output, we
+                    // can't be out of date because of it
+                    if (refStatus.newestInputFileTime <= oldestOutputFileTime) {
+                        continue;
+                    }
+                    // If the upstream project has only change .d.ts files, and we've built
+                    // *after* those files, then we're "psuedo up to date" and eligible for a fast rebuild
+                    if (refStatus.newestDeclarationFileContentChangedTime <= oldestOutputFileTime) {
+                        pseudoUpToDate = true;
+                        continue;
+                    }
+                    // We have an output older than an upstream output - we are out of date
+                    ts.Debug.assert(oldestOutputFileName !== undefined, "Should have an oldest output filename here");
+                    return {
+                        type: UpToDateStatusType.OutOfDateWithUpstream,
+                        outOfDateOutputFileName: oldestOutputFileName,
+                        newerProjectName: ref.path
+                    };
+                }
+            }
+            if (missingOutputFileName !== undefined) {
+                return {
+                    type: UpToDateStatusType.OutputMissing,
+                    missingOutputFileName: missingOutputFileName
+                };
+            }
+            if (isOutOfDateWithInputs) {
+                return {
+                    type: UpToDateStatusType.OutOfDateWithSelf,
+                    outOfDateOutputFileName: oldestOutputFileName,
+                    newerInputFileName: newestInputFileName
+                };
+            }
+            // Up to date
+            return {
+                type: pseudoUpToDate ? UpToDateStatusType.UpToDateWithUpstreamTypes : UpToDateStatusType.UpToDate,
+                newestDeclarationFileContentChangedTime: newestDeclarationFileContentChangedTime,
+                newestInputFileTime: newestInputFileTime,
+                newestOutputFileTime: newestOutputFileTime,
+                newestInputFileName: newestInputFileName,
+                newestOutputFileName: newestOutputFileName,
+                oldestOutputFileName: oldestOutputFileName
+            };
         }
-        var extendedConfigPath = ts.getNormalizedAbsolutePath(extendedConfig, basePath);
-        if (!host.fileExists(extendedConfigPath) && !ts.endsWith(extendedConfigPath, ".json")) {
-            extendedConfigPath = extendedConfigPath + ".json";
-            if (!host.fileExists(extendedConfigPath)) {
-                errors.push(createDiagnostic(ts.Diagnostics.File_0_does_not_exist, extendedConfig));
+        function createDependencyGraph(roots) {
+            var temporaryMarks = {};
+            var permanentMarks = {};
+            var circularityReportStack = [];
+            var buildOrder = [];
+            var graph = createDependencyMapper();
+            var hadError = false;
+            for (var _i = 0, roots_1 = roots; _i < roots_1.length; _i++) {
+                var root = roots_1[_i];
+                visit(root);
+            }
+            if (hadError) {
                 return undefined;
             }
-        }
-        return extendedConfigPath;
-    }
-    function getExtendedConfig(sourceFile, extendedConfigPath, host, basePath, resolutionStack, errors) {
-        var _a;
-        var extendedResult = readJsonConfigFile(extendedConfigPath, function (path) { return host.readFile(path); });
-        if (sourceFile) {
-            (sourceFile.extendedSourceFiles || (sourceFile.extendedSourceFiles = [])).push(extendedResult.fileName);
-        }
-        if (extendedResult.parseDiagnostics.length) {
-            errors.push.apply(errors, extendedResult.parseDiagnostics);
-            return undefined;
-        }
-        var extendedDirname = ts.getDirectoryPath(extendedConfigPath);
-        var extendedConfig = parseConfig(undefined, extendedResult, host, extendedDirname, ts.getBaseFileName(extendedConfigPath), resolutionStack, errors);
-        if (sourceFile) {
-            (_a = sourceFile.extendedSourceFiles).push.apply(_a, extendedResult.extendedSourceFiles);
-        }
-        if (isSuccessfulParsedTsconfig(extendedConfig)) {
-            var relativeDifference_1 = ts.convertToRelativePath(extendedDirname, basePath, ts.identity);
-            var updatePath_1 = function (path) { return ts.isRootedDiskPath(path) ? path : ts.combinePaths(relativeDifference_1, path); };
-            var mapPropertiesInRawIfNotUndefined = function (propertyName) {
-                if (raw_2[propertyName]) {
-                    raw_2[propertyName] = ts.map(raw_2[propertyName], updatePath_1);
-                }
-            };
-            var raw_2 = extendedConfig.raw;
-            mapPropertiesInRawIfNotUndefined("include");
-            mapPropertiesInRawIfNotUndefined("exclude");
-            mapPropertiesInRawIfNotUndefined("files");
-        }
-        return extendedConfig;
-    }
-    function convertCompileOnSaveOptionFromJson(jsonOption, basePath, errors) {
-        if (!ts.hasProperty(jsonOption, ts.compileOnSaveCommandLineOption.name)) {
-            return false;
-        }
-        var result = convertJsonOption(ts.compileOnSaveCommandLineOption, jsonOption.compileOnSave, basePath, errors);
-        return typeof result === "boolean" && result;
-    }
-    function convertCompilerOptionsFromJson(jsonOptions, basePath, configFileName) {
-        var errors = [];
-        var options = convertCompilerOptionsFromJsonWorker(jsonOptions, basePath, errors, configFileName);
-        return { options: options, errors: errors };
-    }
-    ts.convertCompilerOptionsFromJson = convertCompilerOptionsFromJson;
-    function convertTypeAcquisitionFromJson(jsonOptions, basePath, configFileName) {
-        var errors = [];
-        var options = convertTypeAcquisitionFromJsonWorker(jsonOptions, basePath, errors, configFileName);
-        return { options: options, errors: errors };
-    }
-    ts.convertTypeAcquisitionFromJson = convertTypeAcquisitionFromJson;
-    function getDefaultCompilerOptions(configFileName) {
-        var options = configFileName && ts.getBaseFileName(configFileName) === "jsconfig.json"
-            ? { allowJs: true, maxNodeModuleJsDepth: 2, allowSyntheticDefaultImports: true, skipLibCheck: true, noEmit: true }
-            : {};
-        return options;
-    }
-    function convertCompilerOptionsFromJsonWorker(jsonOptions, basePath, errors, configFileName) {
-        var options = getDefaultCompilerOptions(configFileName);
-        convertOptionsFromJson(ts.optionDeclarations, jsonOptions, basePath, options, ts.Diagnostics.Unknown_compiler_option_0, errors);
-        if (configFileName) {
-            options.configFilePath = ts.normalizeSlashes(configFileName);
-        }
-        return options;
-    }
-    function getDefaultTypeAcquisition(configFileName) {
-        return { enable: !!configFileName && ts.getBaseFileName(configFileName) === "jsconfig.json", include: [], exclude: [] };
-    }
-    function convertTypeAcquisitionFromJsonWorker(jsonOptions, basePath, errors, configFileName) {
-        var options = getDefaultTypeAcquisition(configFileName);
-        var typeAcquisition = convertEnableAutoDiscoveryToEnable(jsonOptions);
-        convertOptionsFromJson(ts.typeAcquisitionDeclarations, typeAcquisition, basePath, options, ts.Diagnostics.Unknown_type_acquisition_option_0, errors);
-        return options;
-    }
-    function convertOptionsFromJson(optionDeclarations, jsonOptions, basePath, defaultOptions, diagnosticMessage, errors) {
-        if (!jsonOptions) {
-            return;
-        }
-        var optionNameMap = commandLineOptionsToMap(optionDeclarations);
-        for (var id in jsonOptions) {
-            var opt = optionNameMap.get(id);
-            if (opt) {
-                defaultOptions[opt.name] = convertJsonOption(opt, jsonOptions[id], basePath, errors);
-            }
-            else {
-                errors.push(ts.createCompilerDiagnostic(diagnosticMessage, id));
-            }
-        }
-    }
-    function convertJsonOption(opt, value, basePath, errors) {
-        if (isCompilerOptionsValue(opt, value)) {
-            var optType = opt.type;
-            if (optType === "list" && ts.isArray(value)) {
-                return convertJsonOptionOfListType(opt, value, basePath, errors);
-            }
-            else if (!ts.isString(optType)) {
-                return convertJsonOptionOfCustomType(opt, value, errors);
-            }
-            return normalizeNonListOptionValue(opt, basePath, value);
-        }
-        else {
-            errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, opt.name, getCompilerOptionValueTypeString(opt)));
-        }
-    }
-    function normalizeOptionValue(option, basePath, value) {
-        if (isNullOrUndefined(value))
-            return undefined;
-        if (option.type === "list") {
-            var listOption_1 = option;
-            if (listOption_1.element.isFilePath || !ts.isString(listOption_1.element.type)) {
-                return ts.filter(ts.map(value, function (v) { return normalizeOptionValue(listOption_1.element, basePath, v); }), function (v) { return !!v; });
-            }
-            return value;
-        }
-        else if (!ts.isString(option.type)) {
-            return option.type.get(ts.isString(value) ? value.toLowerCase() : value);
-        }
-        return normalizeNonListOptionValue(option, basePath, value);
-    }
-    function normalizeNonListOptionValue(option, basePath, value) {
-        if (option.isFilePath) {
-            value = ts.normalizePath(ts.combinePaths(basePath, value));
-            if (value === "") {
-                value = ".";
-            }
-        }
-        return value;
-    }
-    function convertJsonOptionOfCustomType(opt, value, errors) {
-        if (isNullOrUndefined(value))
-            return undefined;
-        var key = value.toLowerCase();
-        var val = opt.type.get(key);
-        if (val !== undefined) {
-            return val;
-        }
-        else {
-            errors.push(createCompilerDiagnosticForInvalidCustomType(opt));
-        }
-    }
-    function convertJsonOptionOfListType(option, values, basePath, errors) {
-        return ts.filter(ts.map(values, function (v) { return convertJsonOption(option.element, v, basePath, errors); }), function (v) { return !!v; });
-    }
-    function trimString(s) {
-        return typeof s.trim === "function" ? s.trim() : s.replace(/^[\s]+|[\s]+$/g, "");
-    }
-    var invalidTrailingRecursionPattern = /(^|\/)\*\*\/?$/;
-    var invalidDotDotAfterRecursiveWildcardPattern = /(^|\/)\*\*\/(.*\/)?\.\.($|\/)/;
-    var watchRecursivePattern = /\/[^/]*?[*?][^/]*\//;
-    var wildcardDirectoryPattern = /^[^*?]*(?=\/[^/]*[*?])/;
-    function matchFileNames(filesSpecs, includeSpecs, excludeSpecs, basePath, options, host, errors, extraFileExtensions, jsonSourceFile) {
-        basePath = ts.normalizePath(basePath);
-        var validatedIncludeSpecs, validatedExcludeSpecs;
-        if (includeSpecs) {
-            validatedIncludeSpecs = validateSpecs(includeSpecs, errors, false, jsonSourceFile, "include");
-        }
-        if (excludeSpecs) {
-            validatedExcludeSpecs = validateSpecs(excludeSpecs, errors, true, jsonSourceFile, "exclude");
-        }
-        var wildcardDirectories = getWildcardDirectories(validatedIncludeSpecs, validatedExcludeSpecs, basePath, host.useCaseSensitiveFileNames);
-        var spec = { filesSpecs: filesSpecs, referencesSpecs: undefined, includeSpecs: includeSpecs, excludeSpecs: excludeSpecs, validatedIncludeSpecs: validatedIncludeSpecs, validatedExcludeSpecs: validatedExcludeSpecs, wildcardDirectories: wildcardDirectories };
-        return getFileNamesFromConfigSpecs(spec, basePath, options, host, extraFileExtensions);
-    }
-    function getFileNamesFromConfigSpecs(spec, basePath, options, host, extraFileExtensions) {
-        if (extraFileExtensions === void 0) { extraFileExtensions = []; }
-        basePath = ts.normalizePath(basePath);
-        var keyMapper = host.useCaseSensitiveFileNames ? ts.identity : ts.toLowerCase;
-        var literalFileMap = ts.createMap();
-        var wildcardFileMap = ts.createMap();
-        var filesSpecs = spec.filesSpecs, validatedIncludeSpecs = spec.validatedIncludeSpecs, validatedExcludeSpecs = spec.validatedExcludeSpecs, wildcardDirectories = spec.wildcardDirectories;
-        var supportedExtensions = ts.getSupportedExtensions(options, extraFileExtensions);
-        if (filesSpecs) {
-            for (var _i = 0, filesSpecs_1 = filesSpecs; _i < filesSpecs_1.length; _i++) {
-                var fileName = filesSpecs_1[_i];
-                var file = ts.getNormalizedAbsolutePath(fileName, basePath);
-                literalFileMap.set(keyMapper(file), file);
-            }
-        }
-        if (validatedIncludeSpecs && validatedIncludeSpecs.length > 0) {
-            for (var _a = 0, _b = host.readDirectory(basePath, supportedExtensions, validatedExcludeSpecs, validatedIncludeSpecs, undefined); _a < _b.length; _a++) {
-                var file = _b[_a];
-                if (hasFileWithHigherPriorityExtension(file, literalFileMap, wildcardFileMap, supportedExtensions, keyMapper)) {
-                    continue;
-                }
-                removeWildcardFilesWithLowerPriorityExtension(file, wildcardFileMap, supportedExtensions, keyMapper);
-                var key = keyMapper(file);
-                if (!literalFileMap.has(key) && !wildcardFileMap.has(key)) {
-                    wildcardFileMap.set(key, file);
-                }
-            }
-        }
-        var literalFiles = ts.arrayFrom(literalFileMap.values());
-        var wildcardFiles = ts.arrayFrom(wildcardFileMap.values());
-        var projectReferences = spec.referencesSpecs && spec.referencesSpecs.map(function (r) {
-            return __assign({}, r, { path: ts.getNormalizedAbsolutePath(r.path, basePath) });
-        });
-        return {
-            fileNames: literalFiles.concat(wildcardFiles),
-            projectReferences: projectReferences,
-            wildcardDirectories: wildcardDirectories,
-            spec: spec
-        };
-    }
-    ts.getFileNamesFromConfigSpecs = getFileNamesFromConfigSpecs;
-    function validateSpecs(specs, errors, allowTrailingRecursion, jsonSourceFile, specKey) {
-        return specs.filter(function (spec) {
-            var diag = specToDiagnostic(spec, allowTrailingRecursion);
-            if (diag !== undefined) {
-                errors.push(createDiagnostic(diag, spec));
-            }
-            return diag === undefined;
-        });
-        function createDiagnostic(message, spec) {
-            var element = ts.getTsConfigPropArrayElementValue(jsonSourceFile, specKey, spec);
-            return element ?
-                ts.createDiagnosticForNodeInSourceFile(jsonSourceFile, element, message, spec) :
-                ts.createCompilerDiagnostic(message, spec);
-        }
-    }
-    function specToDiagnostic(spec, allowTrailingRecursion) {
-        if (!allowTrailingRecursion && invalidTrailingRecursionPattern.test(spec)) {
-            return ts.Diagnostics.File_specification_cannot_end_in_a_recursive_directory_wildcard_Asterisk_Asterisk_Colon_0;
-        }
-        else if (invalidDotDotAfterRecursiveWildcardPattern.test(spec)) {
-            return ts.Diagnostics.File_specification_cannot_contain_a_parent_directory_that_appears_after_a_recursive_directory_wildcard_Asterisk_Asterisk_Colon_0;
-        }
-    }
-    function getWildcardDirectories(include, exclude, path, useCaseSensitiveFileNames) {
-        var rawExcludeRegex = ts.getRegularExpressionForWildcard(exclude, path, "exclude");
-        var excludeRegex = rawExcludeRegex && new RegExp(rawExcludeRegex, useCaseSensitiveFileNames ? "" : "i");
-        var wildcardDirectories = {};
-        if (include !== undefined) {
-            var recursiveKeys = [];
-            for (var _i = 0, include_1 = include; _i < include_1.length; _i++) {
-                var file = include_1[_i];
-                var spec = ts.normalizePath(ts.combinePaths(path, file));
-                if (excludeRegex && excludeRegex.test(spec)) {
-                    continue;
-                }
-                var match = getWildcardDirectoryFromSpec(spec, useCaseSensitiveFileNames);
-                if (match) {
-                    var key = match.key, flags = match.flags;
-                    var existingFlags = wildcardDirectories[key];
-                    if (existingFlags === undefined || existingFlags < flags) {
-                        wildcardDirectories[key] = flags;
-                        if (flags === 1) {
-                            recursiveKeys.push(key);
-                        }
-                    }
-                }
-            }
-            for (var key in wildcardDirectories) {
-                if (ts.hasProperty(wildcardDirectories, key)) {
-                    for (var _a = 0, recursiveKeys_1 = recursiveKeys; _a < recursiveKeys_1.length; _a++) {
-                        var recursiveKey = recursiveKeys_1[_a];
-                        if (key !== recursiveKey && ts.containsPath(recursiveKey, key, path, !useCaseSensitiveFileNames)) {
-                            delete wildcardDirectories[key];
-                        }
-                    }
-                }
-            }
-        }
-        return wildcardDirectories;
-    }
-    function getWildcardDirectoryFromSpec(spec, useCaseSensitiveFileNames) {
-        var match = wildcardDirectoryPattern.exec(spec);
-        if (match) {
             return {
-                key: useCaseSensitiveFileNames ? match[0] : match[0].toLowerCase(),
-                flags: watchRecursivePattern.test(spec) ? 1 : 0
+                buildQueue: buildOrder,
+                dependencyMap: graph
             };
-        }
-        if (ts.isImplicitGlob(spec)) {
-            return { key: spec, flags: 1 };
-        }
-        return undefined;
-    }
-    function hasFileWithHigherPriorityExtension(file, literalFiles, wildcardFiles, extensions, keyMapper) {
-        var extensionPriority = ts.getExtensionPriority(file, extensions);
-        var adjustedExtensionPriority = ts.adjustExtensionPriority(extensionPriority, extensions);
-        for (var i = 0; i < adjustedExtensionPriority; i++) {
-            var higherPriorityExtension = extensions[i];
-            var higherPriorityPath = keyMapper(ts.changeExtension(file, higherPriorityExtension));
-            if (literalFiles.has(higherPriorityPath) || wildcardFiles.has(higherPriorityPath)) {
-                return true;
+            function visit(projPath, inCircularContext) {
+                if (inCircularContext === void 0) { inCircularContext = false; }
+                // Already visited
+                if (permanentMarks[projPath])
+                    return;
+                // Circular
+                if (temporaryMarks[projPath]) {
+                    if (!inCircularContext) {
+                        hadError = true;
+                        buildHost.error(ts.Diagnostics.Project_references_may_not_form_a_circular_graph_Cycle_detected_Colon_0, circularityReportStack.join("\r\n"));
+                        return;
+                    }
+                }
+                temporaryMarks[projPath] = true;
+                circularityReportStack.push(projPath);
+                var parsed = configFileCache.parseConfigFile(projPath);
+                if (parsed === undefined) {
+                    hadError = true;
+                    return;
+                }
+                if (parsed.projectReferences) {
+                    for (var _i = 0, _a = parsed.projectReferences; _i < _a.length; _i++) {
+                        var ref = _a[_i];
+                        var resolvedRefPath = resolveProjectName(ref.path);
+                        if (resolvedRefPath === undefined) {
+                            hadError = true;
+                            break;
+                        }
+                        visit(resolvedRefPath, inCircularContext || ref.circular);
+                        graph.addReference(projPath, resolvedRefPath);
+                    }
+                }
+                circularityReportStack.pop();
+                permanentMarks[projPath] = true;
+                buildOrder.push(projPath);
             }
         }
-        return false;
-    }
-    function removeWildcardFilesWithLowerPriorityExtension(file, wildcardFiles, extensions, keyMapper) {
-        var extensionPriority = ts.getExtensionPriority(file, extensions);
-        var nextExtensionPriority = ts.getNextLowestExtensionPriority(extensionPriority, extensions);
-        for (var i = nextExtensionPriority; i < extensions.length; i++) {
-            var lowerPriorityExtension = extensions[i];
-            var lowerPriorityPath = keyMapper(ts.changeExtension(file, lowerPriorityExtension));
-            wildcardFiles.delete(lowerPriorityPath);
-        }
-    }
-    function convertCompilerOptionsForTelemetry(opts) {
-        var out = {};
-        for (var key in opts) {
-            if (opts.hasOwnProperty(key)) {
-                var type = getOptionFromName(key);
-                if (type !== undefined) {
-                    out[key] = getOptionValueWithEmptyStrings(opts[key], type);
+        function buildSingleProject(proj) {
+            if (context.options.dry) {
+                buildHost.message(ts.Diagnostics.A_non_dry_build_would_build_project_0, proj);
+                return BuildResultFlags.Success;
+            }
+            if (context.options.verbose)
+                buildHost.verbose(ts.Diagnostics.Building_project_0, proj);
+            var resultFlags = BuildResultFlags.None;
+            resultFlags |= BuildResultFlags.DeclarationOutputUnchanged;
+            var configFile = configFileCache.parseConfigFile(proj);
+            if (!configFile) {
+                // Failed to read the config file
+                resultFlags |= BuildResultFlags.ConfigFileErrors;
+                context.projectStatus.setValue(proj, { type: UpToDateStatusType.Unbuildable, reason: "Config file errors" });
+                return resultFlags;
+            }
+            if (configFile.fileNames.length === 0) {
+                // Nothing to build - must be a solution file, basically
+                return BuildResultFlags.None;
+            }
+            var programOptions = {
+                projectReferences: configFile.projectReferences,
+                host: compilerHost,
+                rootNames: configFile.fileNames,
+                options: configFile.options
+            };
+            var program = ts.createProgram(programOptions);
+            // Don't emit anything in the presence of syntactic errors or options diagnostics
+            var syntaxDiagnostics = program.getOptionsDiagnostics().concat(program.getSyntacticDiagnostics());
+            if (syntaxDiagnostics.length) {
+                resultFlags |= BuildResultFlags.SyntaxErrors;
+                for (var _i = 0, syntaxDiagnostics_1 = syntaxDiagnostics; _i < syntaxDiagnostics_1.length; _i++) {
+                    var diag = syntaxDiagnostics_1[_i];
+                    buildHost.errorDiagnostic(diag);
+                }
+                context.projectStatus.setValue(proj, { type: UpToDateStatusType.Unbuildable, reason: "Syntactic errors" });
+                return resultFlags;
+            }
+            // Don't emit .d.ts if there are decl file errors
+            if (program.getCompilerOptions().declaration) {
+                var declDiagnostics = program.getDeclarationDiagnostics();
+                if (declDiagnostics.length) {
+                    resultFlags |= BuildResultFlags.DeclarationEmitErrors;
+                    for (var _a = 0, declDiagnostics_1 = declDiagnostics; _a < declDiagnostics_1.length; _a++) {
+                        var diag = declDiagnostics_1[_a];
+                        buildHost.errorDiagnostic(diag);
+                    }
+                    context.projectStatus.setValue(proj, { type: UpToDateStatusType.Unbuildable, reason: "Declaration file errors" });
+                    return resultFlags;
                 }
             }
-        }
-        return out;
-    }
-    ts.convertCompilerOptionsForTelemetry = convertCompilerOptionsForTelemetry;
-    function getOptionValueWithEmptyStrings(value, option) {
-        switch (option.type) {
-            case "object":
-                return "";
-            case "string":
-                return "";
-            case "number":
-                return typeof value === "number" ? value : "";
-            case "boolean":
-                return typeof value === "boolean" ? value : "";
-            case "list":
-                var elementType_1 = option.element;
-                return ts.isArray(value) ? value.map(function (v) { return getOptionValueWithEmptyStrings(v, elementType_1); }) : "";
-            default:
-                return ts.forEachEntry(option.type, function (optionEnumValue, optionStringValue) {
-                    if (optionEnumValue === value) {
-                        return optionStringValue;
+            // Same as above but now for semantic diagnostics
+            var semanticDiagnostics = program.getSemanticDiagnostics();
+            if (semanticDiagnostics.length) {
+                resultFlags |= BuildResultFlags.TypeErrors;
+                for (var _b = 0, semanticDiagnostics_1 = semanticDiagnostics; _b < semanticDiagnostics_1.length; _b++) {
+                    var diag = semanticDiagnostics_1[_b];
+                    buildHost.errorDiagnostic(diag);
+                }
+                context.projectStatus.setValue(proj, { type: UpToDateStatusType.Unbuildable, reason: "Semantic errors" });
+                return resultFlags;
+            }
+            var newestDeclarationFileContentChangedTime = minimumDate;
+            program.emit(/*targetSourceFile*/ undefined, function (fileName, content, writeBom, onError) {
+                var priorChangeTime;
+                if (isDeclarationFile(fileName) && compilerHost.fileExists(fileName)) {
+                    if (compilerHost.readFile(fileName) === content) {
+                        // Check for unchanged .d.ts files
+                        resultFlags &= ~BuildResultFlags.DeclarationOutputUnchanged;
+                        priorChangeTime = compilerHost.getModifiedTime && compilerHost.getModifiedTime(fileName);
                     }
-                });
+                }
+                compilerHost.writeFile(fileName, content, writeBom, onError, ts.emptyArray);
+                if (priorChangeTime !== undefined) {
+                    newestDeclarationFileContentChangedTime = newer(priorChangeTime, newestDeclarationFileContentChangedTime);
+                    context.unchangedOutputs.setValue(fileName, priorChangeTime);
+                }
+            });
+            context.projectStatus.setValue(proj, { type: UpToDateStatusType.UpToDate, newestDeclarationFileContentChangedTime: newestDeclarationFileContentChangedTime });
+            return resultFlags;
+        }
+        function updateOutputTimestamps(proj) {
+            if (context.options.dry) {
+                return buildHost.message(ts.Diagnostics.A_non_dry_build_would_build_project_0, proj.options.configFilePath);
+            }
+            if (context.options.verbose)
+                buildHost.verbose(ts.Diagnostics.Updating_output_timestamps_of_project_0, proj.options.configFilePath);
+            var now = new Date();
+            var outputs = getAllProjectOutputs(proj);
+            var priorNewestUpdateTime = minimumDate;
+            for (var _i = 0, outputs_2 = outputs; _i < outputs_2.length; _i++) {
+                var file = outputs_2[_i];
+                if (isDeclarationFile(file)) {
+                    priorNewestUpdateTime = newer(priorNewestUpdateTime, compilerHost.getModifiedTime(file));
+                }
+                compilerHost.setModifiedTime(file, now);
+            }
+            context.projectStatus.setValue(proj.options.configFilePath, { type: UpToDateStatusType.UpToDate, newestDeclarationFileContentChangedTime: priorNewestUpdateTime });
+        }
+        function getFilesToClean(configFileNames) {
+            var resolvedNames = resolveProjectNames(configFileNames);
+            if (resolvedNames === undefined)
+                return undefined;
+            // Get the same graph for cleaning we'd use for building
+            var graph = createDependencyGraph(resolvedNames);
+            if (graph === undefined)
+                return undefined;
+            var filesToDelete = [];
+            for (var _i = 0, _a = graph.buildQueue; _i < _a.length; _i++) {
+                var proj = _a[_i];
+                var parsed = configFileCache.parseConfigFile(proj);
+                if (parsed === undefined) {
+                    // File has gone missing; fine to ignore here
+                    continue;
+                }
+                var outputs = getAllProjectOutputs(parsed);
+                for (var _b = 0, outputs_3 = outputs; _b < outputs_3.length; _b++) {
+                    var output = outputs_3[_b];
+                    if (compilerHost.fileExists(output)) {
+                        filesToDelete.push(output);
+                    }
+                }
+            }
+            return filesToDelete;
+        }
+        function getAllProjectsInScope() {
+            var resolvedNames = resolveProjectNames(rootNames);
+            if (resolvedNames === undefined)
+                return undefined;
+            var graph = createDependencyGraph(resolvedNames);
+            if (graph === undefined)
+                return undefined;
+            return graph.buildQueue;
+        }
+        function cleanAllProjects() {
+            var resolvedNames = getAllProjectsInScope();
+            if (resolvedNames === undefined) {
+                return buildHost.message(ts.Diagnostics.Skipping_clean_because_not_all_projects_could_be_located);
+            }
+            var filesToDelete = getFilesToClean(resolvedNames);
+            if (filesToDelete === undefined) {
+                return buildHost.message(ts.Diagnostics.Skipping_clean_because_not_all_projects_could_be_located);
+            }
+            if (context.options.dry) {
+                return buildHost.message(ts.Diagnostics.A_non_dry_build_would_delete_the_following_files_Colon_0, filesToDelete.map(function (f) { return "\r\n * " + f; }).join(""));
+            }
+            // Do this check later to allow --clean --dry to function even if the host can't delete files
+            if (!compilerHost.deleteFile) {
+                throw new Error("Host does not support deleting files");
+            }
+            for (var _i = 0, filesToDelete_1 = filesToDelete; _i < filesToDelete_1.length; _i++) {
+                var output = filesToDelete_1[_i];
+                compilerHost.deleteFile(output);
+            }
+        }
+        function resolveProjectName(name) {
+            var fullPath = ts.resolvePath(compilerHost.getCurrentDirectory(), name);
+            if (compilerHost.fileExists(fullPath)) {
+                return fullPath;
+            }
+            var fullPathWithTsconfig = ts.combinePaths(fullPath, "tsconfig.json");
+            if (compilerHost.fileExists(fullPathWithTsconfig)) {
+                return fullPathWithTsconfig;
+            }
+            buildHost.error(ts.Diagnostics.File_0_not_found, relName(fullPath));
+            return undefined;
+        }
+        function resolveProjectNames(configFileNames) {
+            var resolvedNames = [];
+            for (var _i = 0, configFileNames_1 = configFileNames; _i < configFileNames_1.length; _i++) {
+                var name = configFileNames_1[_i];
+                var resolved = resolveProjectName(name);
+                if (resolved === undefined) {
+                    return undefined;
+                }
+                resolvedNames.push(resolved);
+            }
+            return resolvedNames;
+        }
+        function buildAllProjects() {
+            var graph = getGlobalDependencyGraph();
+            if (graph === undefined)
+                return;
+            var queue = graph.buildQueue;
+            reportBuildQueue(graph);
+            for (var _i = 0, queue_1 = queue; _i < queue_1.length; _i++) {
+                var next = queue_1[_i];
+                var proj = configFileCache.parseConfigFile(next);
+                if (proj === undefined) {
+                    break;
+                }
+                var status = getUpToDateStatus(proj);
+                verboseReportProjectStatus(next, status);
+                var projName = proj.options.configFilePath;
+                if (status.type === UpToDateStatusType.UpToDate && !context.options.force) {
+                    // Up to date, skip
+                    if (defaultOptions.dry) {
+                        // In a dry build, inform the user of this fact
+                        buildHost.message(ts.Diagnostics.Project_0_is_up_to_date, projName);
+                    }
+                    continue;
+                }
+                if (status.type === UpToDateStatusType.UpToDateWithUpstreamTypes && !context.options.force) {
+                    // Fake build
+                    updateOutputTimestamps(proj);
+                    continue;
+                }
+                if (status.type === UpToDateStatusType.UpstreamBlocked) {
+                    if (context.options.verbose)
+                        buildHost.verbose(ts.Diagnostics.Skipping_build_of_project_0_because_its_dependency_1_has_errors, projName, status.upstreamProjectName);
+                    continue;
+                }
+                if (status.type === UpToDateStatusType.ContainerOnly) {
+                    // Do nothing
+                    continue;
+                }
+                buildSingleProject(next);
+            }
+        }
+        /**
+         * Report the build ordering inferred from the current project graph if we're in verbose mode
+         */
+        function reportBuildQueue(graph) {
+            if (!context.options.verbose)
+                return;
+            var names = [];
+            for (var _i = 0, _a = graph.buildQueue; _i < _a.length; _i++) {
+                var name = _a[_i];
+                names.push(name);
+            }
+            if (context.options.verbose)
+                buildHost.verbose(ts.Diagnostics.Projects_in_this_build_Colon_0, names.map(function (s) { return "\r\n    * " + relName(s); }).join(""));
+        }
+        function relName(path) {
+            return ts.convertToRelativePath(path, compilerHost.getCurrentDirectory(), function (f) { return compilerHost.getCanonicalFileName(f); });
+        }
+        /**
+         * Report the up-to-date status of a project if we're in verbose mode
+         */
+        function verboseReportProjectStatus(configFileName, status) {
+            if (!context.options.verbose)
+                return;
+            switch (status.type) {
+                case UpToDateStatusType.OutOfDateWithSelf:
+                    return buildHost.verbose(ts.Diagnostics.Project_0_is_out_of_date_because_oldest_output_1_is_older_than_newest_input_2, relName(configFileName), relName(status.outOfDateOutputFileName), relName(status.newerInputFileName));
+                case UpToDateStatusType.OutOfDateWithUpstream:
+                    return buildHost.verbose(ts.Diagnostics.Project_0_is_out_of_date_because_oldest_output_1_is_older_than_newest_input_2, relName(configFileName), relName(status.outOfDateOutputFileName), relName(status.newerProjectName));
+                case UpToDateStatusType.OutputMissing:
+                    return buildHost.verbose(ts.Diagnostics.Project_0_is_out_of_date_because_output_file_1_does_not_exist, relName(configFileName), relName(status.missingOutputFileName));
+                case UpToDateStatusType.UpToDate:
+                    if (status.newestInputFileTime !== undefined) {
+                        return buildHost.verbose(ts.Diagnostics.Project_0_is_up_to_date_because_newest_input_1_is_older_than_oldest_output_2, relName(configFileName), relName(status.newestInputFileName), relName(status.oldestOutputFileName));
+                    }
+                    // Don't report anything for "up to date because it was already built" -- too verbose
+                    break;
+                case UpToDateStatusType.UpToDateWithUpstreamTypes:
+                    return buildHost.verbose(ts.Diagnostics.Project_0_is_up_to_date_with_d_ts_files_from_its_dependencies, relName(configFileName));
+                case UpToDateStatusType.UpstreamOutOfDate:
+                    return buildHost.verbose(ts.Diagnostics.Project_0_is_out_of_date_because_its_dependency_1_is_out_of_date, relName(configFileName), relName(status.upstreamProjectName));
+                case UpToDateStatusType.UpstreamBlocked:
+                    return buildHost.verbose(ts.Diagnostics.Project_0_can_t_be_built_because_its_dependency_1_has_errors, relName(configFileName), relName(status.upstreamProjectName));
+                case UpToDateStatusType.Unbuildable:
+                    return buildHost.verbose(ts.Diagnostics.Failed_to_parse_file_0_Colon_1, relName(configFileName), status.reason);
+                case UpToDateStatusType.ContainerOnly:
+                    // Don't report status on "solution" projects
+                    break;
+                default:
+                    ts.assertTypeIsNever(status);
+            }
         }
     }
+    ts.createSolutionBuilder = createSolutionBuilder;
 })(ts || (ts = {}));
+//# sourceMappingURL=compiler.js.map
+"use strict";
+var __assign = (this && this.__assign) || Object.assign || function(t) {
+    for (var s, i = 1, n = arguments.length; i < n; i++) {
+        s = arguments[i];
+        for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
+            t[p] = s[p];
+    }
+    return t;
+};
+var __extends = (this && this.__extends) || (function () {
+    var extendStatics = Object.setPrototypeOf ||
+        ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
+        function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
+    return function (d, b) {
+        extendStatics(d, b);
+        function __() { this.constructor = d; }
+        d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
+    };
+})();
 var ts;
 (function (ts) {
     var ScriptSnapshot;
     (function (ScriptSnapshot) {
-        var StringScriptSnapshot = (function () {
+        var StringScriptSnapshot = /** @class */ (function () {
             function StringScriptSnapshot(text) {
                 this.text = text;
             }
@@ -70316,6 +86269,8 @@ var ts;
                 return this.text.length;
             };
             StringScriptSnapshot.prototype.getChangeRange = function () {
+                // Text-based snapshots do not support incremental parsing. Return undefined
+                // to signal that to the caller.
                 return undefined;
             };
             return StringScriptSnapshot;
@@ -70325,8 +86280,9 @@ var ts;
         }
         ScriptSnapshot.fromString = fromString;
     })(ScriptSnapshot = ts.ScriptSnapshot || (ts.ScriptSnapshot = {}));
+    /* @internal */
     ts.defaultPreferences = {};
-    var TextChange = (function () {
+    var TextChange = /** @class */ (function () {
         function TextChange() {
         }
         return TextChange;
@@ -70372,9 +86328,13 @@ var ts;
     })(SymbolDisplayPartKind = ts.SymbolDisplayPartKind || (ts.SymbolDisplayPartKind = {}));
     var OutliningSpanKind;
     (function (OutliningSpanKind) {
+        /** Single or multi-line comments */
         OutliningSpanKind["Comment"] = "comment";
+        /** Sections marked by '// #region' and '// #endregion' comments */
         OutliningSpanKind["Region"] = "region";
+        /** Declarations and expressions */
         OutliningSpanKind["Code"] = "code";
+        /** Contiguous blocks of import declarations */
         OutliningSpanKind["Imports"] = "imports";
     })(OutliningSpanKind = ts.OutliningSpanKind || (ts.OutliningSpanKind = {}));
     var OutputFileType;
@@ -70409,27 +86369,56 @@ var ts;
     (function (ScriptElementKind) {
         ScriptElementKind["unknown"] = "";
         ScriptElementKind["warning"] = "warning";
+        /** predefined type (void) or keyword (class) */
         ScriptElementKind["keyword"] = "keyword";
+        /** top level script node */
         ScriptElementKind["scriptElement"] = "script";
+        /** module foo {} */
         ScriptElementKind["moduleElement"] = "module";
+        /** class X {} */
         ScriptElementKind["classElement"] = "class";
+        /** var x = class X {} */
         ScriptElementKind["localClassElement"] = "local class";
+        /** interface Y {} */
         ScriptElementKind["interfaceElement"] = "interface";
+        /** type T = ... */
         ScriptElementKind["typeElement"] = "type";
+        /** enum E */
         ScriptElementKind["enumElement"] = "enum";
         ScriptElementKind["enumMemberElement"] = "enum member";
+        /**
+         * Inside module and script only
+         * const v = ..
+         */
         ScriptElementKind["variableElement"] = "var";
+        /** Inside function */
         ScriptElementKind["localVariableElement"] = "local var";
+        /**
+         * Inside module and script only
+         * function f() { }
+         */
         ScriptElementKind["functionElement"] = "function";
+        /** Inside function */
         ScriptElementKind["localFunctionElement"] = "local function";
+        /** class X { [public|private]* foo() {} } */
         ScriptElementKind["memberFunctionElement"] = "method";
+        /** class X { [public|private]* [get|set] foo:number; } */
         ScriptElementKind["memberGetAccessorElement"] = "getter";
         ScriptElementKind["memberSetAccessorElement"] = "setter";
+        /**
+         * class X { [public|private]* foo:number; }
+         * interface Y { foo:number; }
+         */
         ScriptElementKind["memberVariableElement"] = "property";
+        /** class X { constructor() { } } */
         ScriptElementKind["constructorImplementationElement"] = "constructor";
+        /** interface Y { ():number; } */
         ScriptElementKind["callSignatureElement"] = "call";
+        /** interface Y { []:number; } */
         ScriptElementKind["indexSignatureElement"] = "index";
+        /** interface Y { new():Y; } */
         ScriptElementKind["constructSignatureElement"] = "construct";
+        /** function foo(*Y*: string) */
         ScriptElementKind["parameterElement"] = "parameter";
         ScriptElementKind["typeParameterElement"] = "type parameter";
         ScriptElementKind["primitiveType"] = "primitive type";
@@ -70439,7 +86428,11 @@ var ts;
         ScriptElementKind["letElement"] = "let";
         ScriptElementKind["directory"] = "directory";
         ScriptElementKind["externalModuleName"] = "external module name";
+        /**
+         * <JsxTagName attribute1 attribute2={0} />
+         */
         ScriptElementKind["jsxAttribute"] = "JSX attribute";
+        /** String literal */
         ScriptElementKind["string"] = "string";
     })(ScriptElementKind = ts.ScriptElementKind || (ts.ScriptElementKind = {}));
     var ScriptElementKindModifier;
@@ -70508,9 +86501,11 @@ var ts;
         ClassificationType[ClassificationType["jsxAttributeStringLiteralValue"] = 24] = "jsxAttributeStringLiteralValue";
     })(ClassificationType = ts.ClassificationType || (ts.ClassificationType = {}));
 })(ts || (ts = {}));
+// These utilities are common to multiple language service features.
+/* @internal */
 var ts;
 (function (ts) {
-    ts.scanner = ts.createScanner(6, true);
+    ts.scanner = ts.createScanner(6 /* Latest */, /*skipTrivia*/ true);
     var SemanticMeaning;
     (function (SemanticMeaning) {
         SemanticMeaning[SemanticMeaning["None"] = 0] = "None";
@@ -70521,64 +86516,66 @@ var ts;
     })(SemanticMeaning = ts.SemanticMeaning || (ts.SemanticMeaning = {}));
     function getMeaningFromDeclaration(node) {
         switch (node.kind) {
-            case 149:
-            case 232:
-            case 182:
-            case 152:
-            case 151:
-            case 270:
-            case 271:
-            case 154:
-            case 153:
-            case 155:
-            case 156:
-            case 157:
-            case 234:
-            case 192:
-            case 193:
-            case 269:
-            case 262:
-                return 1;
-            case 148:
-            case 236:
-            case 237:
-            case 166:
-                return 2;
-            case 297:
-                return node.name === undefined ? 1 | 2 : 2;
-            case 273:
-            case 235:
-                return 1 | 2;
-            case 239:
+            case 149 /* Parameter */:
+            case 232 /* VariableDeclaration */:
+            case 182 /* BindingElement */:
+            case 152 /* PropertyDeclaration */:
+            case 151 /* PropertySignature */:
+            case 270 /* PropertyAssignment */:
+            case 271 /* ShorthandPropertyAssignment */:
+            case 154 /* MethodDeclaration */:
+            case 153 /* MethodSignature */:
+            case 155 /* Constructor */:
+            case 156 /* GetAccessor */:
+            case 157 /* SetAccessor */:
+            case 234 /* FunctionDeclaration */:
+            case 192 /* FunctionExpression */:
+            case 193 /* ArrowFunction */:
+            case 269 /* CatchClause */:
+            case 262 /* JsxAttribute */:
+                return 1 /* Value */;
+            case 148 /* TypeParameter */:
+            case 236 /* InterfaceDeclaration */:
+            case 237 /* TypeAliasDeclaration */:
+            case 166 /* TypeLiteral */:
+                return 2 /* Type */;
+            case 297 /* JSDocTypedefTag */:
+                // If it has no name node, it shares the name with the value declaration below it.
+                return node.name === undefined ? 1 /* Value */ | 2 /* Type */ : 2 /* Type */;
+            case 273 /* EnumMember */:
+            case 235 /* ClassDeclaration */:
+                return 1 /* Value */ | 2 /* Type */;
+            case 239 /* ModuleDeclaration */:
                 if (ts.isAmbientModule(node)) {
-                    return 4 | 1;
+                    return 4 /* Namespace */ | 1 /* Value */;
                 }
-                else if (ts.getModuleInstanceState(node) === 1) {
-                    return 4 | 1;
+                else if (ts.getModuleInstanceState(node) === 1 /* Instantiated */) {
+                    return 4 /* Namespace */ | 1 /* Value */;
                 }
                 else {
-                    return 4;
+                    return 4 /* Namespace */;
                 }
-            case 238:
-            case 247:
-            case 248:
-            case 243:
-            case 244:
-            case 249:
-            case 250:
-                return 7;
-            case 274:
-                return 4 | 1;
+            case 238 /* EnumDeclaration */:
+            case 247 /* NamedImports */:
+            case 248 /* ImportSpecifier */:
+            case 243 /* ImportEqualsDeclaration */:
+            case 244 /* ImportDeclaration */:
+            case 249 /* ExportAssignment */:
+            case 250 /* ExportDeclaration */:
+                return 7 /* All */;
+            // An external module can be a Value
+            case 274 /* SourceFile */:
+                return 4 /* Namespace */ | 1 /* Value */;
         }
-        return 7;
+        return 7 /* All */;
     }
     ts.getMeaningFromDeclaration = getMeaningFromDeclaration;
     function getMeaningFromLocation(node) {
-        if (node.kind === 274) {
-            return 1;
+        if (node.kind === 274 /* SourceFile */) {
+            return 1 /* Value */;
         }
-        else if (node.parent.kind === 249) {
-            return 7;
+        else if (node.parent.kind === 249 /* ExportAssignment */) {
+            return 7 /* All */;
         }
         else if (isInRightSideOfInternalImportEqualsDeclaration(node)) {
             return getMeaningFromRightHandSideOfImportEquals(node);
@@ -70587,29 +86584,33 @@ var ts;
             return getMeaningFromDeclaration(node.parent);
         }
         else if (isTypeReference(node)) {
-            return 2;
+            return 2 /* Type */;
         }
         else if (isNamespaceReference(node)) {
-            return 4;
+            return 4 /* Namespace */;
         }
         else if (ts.isTypeParameterDeclaration(node.parent)) {
-            ts.Debug.assert(ts.isJSDocTemplateTag(node.parent.parent));
-            return 2;
+            ts.Debug.assert(ts.isJSDocTemplateTag(node.parent.parent)); // Else would be handled by isDeclarationName
+            return 2 /* Type */;
         }
         else if (ts.isLiteralTypeNode(node.parent)) {
-            return 2 | 1;
+            // This might be T["name"], which is actually referencing a property and not a type. So allow both meanings.
+            return 2 /* Type */ | 1 /* Value */;
         }
         else {
-            return 1;
+            return 1 /* Value */;
         }
     }
     ts.getMeaningFromLocation = getMeaningFromLocation;
     function getMeaningFromRightHandSideOfImportEquals(node) {
-        var name = node.kind === 146 ? node : ts.isQualifiedName(node.parent) && node.parent.right === node ? node.parent : undefined;
-        return name && name.parent.kind === 243 ? 7 : 4;
+        //     import a = |b|; // Namespace
+        //     import a = |b.c|; // Value, type, namespace
+        //     import a = |b.c|.d; // Namespace
+        var name = node.kind === 146 /* QualifiedName */ ? node : ts.isQualifiedName(node.parent) && node.parent.right === node ? node.parent : undefined;
+        return name && name.parent.kind === 243 /* ImportEqualsDeclaration */ ? 7 /* All */ : 4 /* Namespace */;
     }
     function isInRightSideOfInternalImportEqualsDeclaration(node) {
-        while (node.parent.kind === 146) {
+        while (node.parent.kind === 146 /* QualifiedName */) {
             node = node.parent;
         }
         return ts.isInternalModuleImportEqualsDeclaration(node.parent) && node.parent.moduleReference === node;
@@ -70621,27 +86622,27 @@ var ts;
     function isQualifiedNameNamespaceReference(node) {
         var root = node;
         var isLastClause = true;
-        if (root.parent.kind === 146) {
-            while (root.parent && root.parent.kind === 146) {
+        if (root.parent.kind === 146 /* QualifiedName */) {
+            while (root.parent && root.parent.kind === 146 /* QualifiedName */) {
                 root = root.parent;
             }
             isLastClause = root.right === node;
         }
-        return root.parent.kind === 162 && !isLastClause;
+        return root.parent.kind === 162 /* TypeReference */ && !isLastClause;
     }
     function isPropertyAccessNamespaceReference(node) {
         var root = node;
         var isLastClause = true;
-        if (root.parent.kind === 185) {
-            while (root.parent && root.parent.kind === 185) {
+        if (root.parent.kind === 185 /* PropertyAccessExpression */) {
+            while (root.parent && root.parent.kind === 185 /* PropertyAccessExpression */) {
                 root = root.parent;
             }
             isLastClause = root.name === node;
         }
-        if (!isLastClause && root.parent.kind === 207 && root.parent.parent.kind === 268) {
+        if (!isLastClause && root.parent.kind === 207 /* ExpressionWithTypeArguments */ && root.parent.parent.kind === 268 /* HeritageClause */) {
             var decl = root.parent.parent.parent;
-            return (decl.kind === 235 && root.parent.parent.token === 108) ||
-                (decl.kind === 236 && root.parent.parent.token === 85);
+            return (decl.kind === 235 /* ClassDeclaration */ && root.parent.parent.token === 108 /* ImplementsKeyword */) ||
+                (decl.kind === 236 /* InterfaceDeclaration */ && root.parent.parent.token === 85 /* ExtendsKeyword */);
         }
         return false;
     }
@@ -70650,27 +86651,27 @@ var ts;
             node = node.parent;
         }
         switch (node.kind) {
-            case 99:
+            case 99 /* ThisKeyword */:
                 return !ts.isExpressionNode(node);
-            case 174:
+            case 174 /* ThisType */:
                 return true;
         }
         switch (node.parent.kind) {
-            case 162:
+            case 162 /* TypeReference */:
                 return true;
-            case 179:
+            case 179 /* ImportType */:
                 return !node.parent.isTypeOf;
-            case 207:
+            case 207 /* ExpressionWithTypeArguments */:
                 return !ts.isExpressionWithTypeArgumentsInClassExtendsClause(node.parent);
         }
         return false;
     }
     function isCallExpressionTarget(node) {
-        return isCallOrNewExpressionTarget(node, 187);
+        return isCallOrNewExpressionTarget(node, 187 /* CallExpression */);
     }
     ts.isCallExpressionTarget = isCallExpressionTarget;
     function isNewExpressionTarget(node) {
-        return isCallOrNewExpressionTarget(node, 188);
+        return isCallOrNewExpressionTarget(node, 188 /* NewExpression */);
     }
     ts.isNewExpressionTarget = isNewExpressionTarget;
     function isCallOrNewExpressionTarget(node, kind) {
@@ -70683,7 +86684,7 @@ var ts;
     ts.climbPastPropertyAccess = climbPastPropertyAccess;
     function getTargetLabel(referenceNode, labelName) {
         while (referenceNode) {
-            if (referenceNode.kind === 228 && referenceNode.label.escapedText === labelName) {
+            if (referenceNode.kind === 228 /* LabeledStatement */ && referenceNode.label.escapedText === labelName) {
                 return referenceNode.label;
             }
             referenceNode = referenceNode.parent;
@@ -70692,11 +86693,11 @@ var ts;
     }
     ts.getTargetLabel = getTargetLabel;
     function isJumpStatementTarget(node) {
-        return node.kind === 71 && ts.isBreakOrContinueStatement(node.parent) && node.parent.label === node;
+        return node.kind === 71 /* Identifier */ && ts.isBreakOrContinueStatement(node.parent) && node.parent.label === node;
     }
     ts.isJumpStatementTarget = isJumpStatementTarget;
     function isLabelOfLabeledStatement(node) {
-        return node.kind === 71 && ts.isLabeledStatement(node.parent) && node.parent.label === node;
+        return node.kind === 71 /* Identifier */ && ts.isLabeledStatement(node.parent) && node.parent.label === node;
     }
     ts.isLabelOfLabeledStatement = isLabelOfLabeledStatement;
     function isLabelName(node) {
@@ -70704,40 +86705,40 @@ var ts;
     }
     ts.isLabelName = isLabelName;
     function isRightSideOfQualifiedName(node) {
-        return node.parent.kind === 146 && node.parent.right === node;
+        return node.parent.kind === 146 /* QualifiedName */ && node.parent.right === node;
     }
     ts.isRightSideOfQualifiedName = isRightSideOfQualifiedName;
     function isRightSideOfPropertyAccess(node) {
-        return node && node.parent && node.parent.kind === 185 && node.parent.name === node;
+        return node && node.parent && node.parent.kind === 185 /* PropertyAccessExpression */ && node.parent.name === node;
     }
     ts.isRightSideOfPropertyAccess = isRightSideOfPropertyAccess;
     function isNameOfModuleDeclaration(node) {
-        return node.parent.kind === 239 && node.parent.name === node;
+        return node.parent.kind === 239 /* ModuleDeclaration */ && node.parent.name === node;
     }
     ts.isNameOfModuleDeclaration = isNameOfModuleDeclaration;
     function isNameOfFunctionDeclaration(node) {
-        return node.kind === 71 &&
+        return node.kind === 71 /* Identifier */ &&
             ts.isFunctionLike(node.parent) && node.parent.name === node;
     }
     ts.isNameOfFunctionDeclaration = isNameOfFunctionDeclaration;
     function isLiteralNameOfPropertyDeclarationOrIndexAccess(node) {
         switch (node.parent.kind) {
-            case 152:
-            case 151:
-            case 270:
-            case 273:
-            case 154:
-            case 153:
-            case 156:
-            case 157:
-            case 239:
+            case 152 /* PropertyDeclaration */:
+            case 151 /* PropertySignature */:
+            case 270 /* PropertyAssignment */:
+            case 273 /* EnumMember */:
+            case 154 /* MethodDeclaration */:
+            case 153 /* MethodSignature */:
+            case 156 /* GetAccessor */:
+            case 157 /* SetAccessor */:
+            case 239 /* ModuleDeclaration */:
                 return ts.getNameOfDeclaration(node.parent) === node;
-            case 186:
+            case 186 /* ElementAccessExpression */:
                 return node.parent.argumentExpression === node;
-            case 147:
+            case 147 /* ComputedPropertyName */:
                 return true;
-            case 178:
-                return node.parent.parent.kind === 176;
+            case 178 /* LiteralType */:
+                return node.parent.parent.kind === 176 /* IndexedAccessType */;
             default:
                 return false;
         }
@@ -70750,6 +86751,9 @@ var ts;
     ts.isExpressionOfExternalModuleImportEqualsDeclaration = isExpressionOfExternalModuleImportEqualsDeclaration;
     function getContainerNode(node) {
         if (ts.isJSDocTypeAlias(node)) {
+            // This doesn't just apply to the node immediately under the comment, but to everything in its parent's scope.
+            // node.parent = the JSDoc comment, node.parent.parent = the node having the comment.
+            // Then we get parent again in the loop.
             node = node.parent.parent;
         }
         while (true) {
@@ -70758,17 +86762,17 @@ var ts;
                 return undefined;
             }
             switch (node.kind) {
-                case 274:
-                case 154:
-                case 153:
-                case 234:
-                case 192:
-                case 156:
-                case 157:
-                case 235:
-                case 236:
-                case 238:
-                case 239:
+                case 274 /* SourceFile */:
+                case 154 /* MethodDeclaration */:
+                case 153 /* MethodSignature */:
+                case 234 /* FunctionDeclaration */:
+                case 192 /* FunctionExpression */:
+                case 156 /* GetAccessor */:
+                case 157 /* SetAccessor */:
+                case 235 /* ClassDeclaration */:
+                case 236 /* InterfaceDeclaration */:
+                case 238 /* EnumDeclaration */:
+                case 239 /* ModuleDeclaration */:
                     return node;
             }
         }
@@ -70776,94 +86780,98 @@ var ts;
     ts.getContainerNode = getContainerNode;
     function getNodeKind(node) {
         switch (node.kind) {
-            case 274:
-                return ts.isExternalModule(node) ? "module" : "script";
-            case 239:
-                return "module";
-            case 235:
-            case 205:
-                return "class";
-            case 236: return "interface";
-            case 237:
-            case 292:
-            case 297:
-                return "type";
-            case 238: return "enum";
-            case 232:
+            case 274 /* SourceFile */:
+                return ts.isExternalModule(node) ? "module" /* moduleElement */ : "script" /* scriptElement */;
+            case 239 /* ModuleDeclaration */:
+                return "module" /* moduleElement */;
+            case 235 /* ClassDeclaration */:
+            case 205 /* ClassExpression */:
+                return "class" /* classElement */;
+            case 236 /* InterfaceDeclaration */: return "interface" /* interfaceElement */;
+            case 237 /* TypeAliasDeclaration */:
+            case 292 /* JSDocCallbackTag */:
+            case 297 /* JSDocTypedefTag */:
+                return "type" /* typeElement */;
+            case 238 /* EnumDeclaration */: return "enum" /* enumElement */;
+            case 232 /* VariableDeclaration */:
                 return getKindOfVariableDeclaration(node);
-            case 182:
+            case 182 /* BindingElement */:
                 return getKindOfVariableDeclaration(ts.getRootDeclaration(node));
-            case 193:
-            case 234:
-            case 192:
-                return "function";
-            case 156: return "getter";
-            case 157: return "setter";
-            case 154:
-            case 153:
-                return "method";
-            case 152:
-            case 151:
-                return "property";
-            case 160: return "index";
-            case 159: return "construct";
-            case 158: return "call";
-            case 155: return "constructor";
-            case 148: return "type parameter";
-            case 273: return "enum member";
-            case 149: return ts.hasModifier(node, 92) ? "property" : "parameter";
-            case 243:
-            case 248:
-            case 245:
-            case 252:
-            case 246:
-                return "alias";
-            case 200:
+            case 193 /* ArrowFunction */:
+            case 234 /* FunctionDeclaration */:
+            case 192 /* FunctionExpression */:
+                return "function" /* functionElement */;
+            case 156 /* GetAccessor */: return "getter" /* memberGetAccessorElement */;
+            case 157 /* SetAccessor */: return "setter" /* memberSetAccessorElement */;
+            case 154 /* MethodDeclaration */:
+            case 153 /* MethodSignature */:
+                return "method" /* memberFunctionElement */;
+            case 152 /* PropertyDeclaration */:
+            case 151 /* PropertySignature */:
+                return "property" /* memberVariableElement */;
+            case 160 /* IndexSignature */: return "index" /* indexSignatureElement */;
+            case 159 /* ConstructSignature */: return "construct" /* constructSignatureElement */;
+            case 158 /* CallSignature */: return "call" /* callSignatureElement */;
+            case 155 /* Constructor */: return "constructor" /* constructorImplementationElement */;
+            case 148 /* TypeParameter */: return "type parameter" /* typeParameterElement */;
+            case 273 /* EnumMember */: return "enum member" /* enumMemberElement */;
+            case 149 /* Parameter */: return ts.hasModifier(node, 92 /* ParameterPropertyModifier */) ? "property" /* memberVariableElement */ : "parameter" /* parameterElement */;
+            case 243 /* ImportEqualsDeclaration */:
+            case 248 /* ImportSpecifier */:
+            case 245 /* ImportClause */:
+            case 252 /* ExportSpecifier */:
+            case 246 /* NamespaceImport */:
+                return "alias" /* alias */;
+            case 200 /* BinaryExpression */:
                 var kind = ts.getSpecialPropertyAssignmentKind(node);
                 var right = node.right;
                 switch (kind) {
-                    case 0:
-                        return "";
-                    case 1:
-                    case 2:
+                    case 0 /* None */:
+                        return "" /* unknown */;
+                    case 1 /* ExportsProperty */:
+                    case 2 /* ModuleExports */:
                         var rightKind = getNodeKind(right);
-                        return rightKind === "" ? "const" : rightKind;
-                    case 3:
-                        return ts.isFunctionExpression(right) ? "method" : "property";
-                    case 4:
-                        return "property";
-                    case 5:
-                        return ts.isFunctionExpression(right) ? "method" : "property";
-                    case 6:
-                        return "local class";
+                        return rightKind === "" /* unknown */ ? "const" /* constElement */ : rightKind;
+                    case 3 /* PrototypeProperty */:
+                        return ts.isFunctionExpression(right) ? "method" /* memberFunctionElement */ : "property" /* memberVariableElement */;
+                    case 4 /* ThisProperty */:
+                        return "property" /* memberVariableElement */; // property
+                    case 5 /* Property */:
+                        // static method / property
+                        return ts.isFunctionExpression(right) ? "method" /* memberFunctionElement */ : "property" /* memberVariableElement */;
+                    case 6 /* Prototype */:
+                        return "local class" /* localClassElement */;
                     default: {
                         ts.assertTypeIsNever(kind);
-                        return "";
+                        return "" /* unknown */;
                     }
                 }
             default:
-                return "";
+                return "" /* unknown */;
         }
         function getKindOfVariableDeclaration(v) {
             return ts.isConst(v)
-                ? "const"
+                ? "const" /* constElement */
                 : ts.isLet(v)
-                    ? "let"
-                    : "var";
+                    ? "let" /* letElement */
+                    : "var" /* variableElement */;
         }
     }
     ts.getNodeKind = getNodeKind;
     function isThis(node) {
         switch (node.kind) {
-            case 99:
+            case 99 /* ThisKeyword */:
+                // case SyntaxKind.ThisType: TODO: GH#9267
                 return true;
-            case 71:
-                return ts.identifierIsThisKeyword(node) && node.parent.kind === 149;
+            case 71 /* Identifier */:
+                // 'this' as a parameter
+                return ts.identifierIsThisKeyword(node) && node.parent.kind === 149 /* Parameter */;
             default:
                 return false;
         }
     }
     ts.isThis = isThis;
+    // Matches the beginning of a triple slash directive
     var tripleSlashDirectivePrefixRegex = /^\/\/\/\s*</;
     function getLineStartPositionForPosition(position, sourceFile) {
         var lineStarts = ts.getLineStarts(sourceFile);
@@ -70901,6 +86909,9 @@ var ts;
         return start < end;
     }
     ts.startEndOverlapsWithStartEnd = startEndOverlapsWithStartEnd;
+    /**
+     * Assumes `candidate.start <= position` holds.
+     */
     function positionBelongsToNode(candidate, position, sourceFile) {
         ts.Debug.assert(candidate.pos <= position);
         return position < candidate.end || !isCompletedNode(candidate, sourceFile);
@@ -70911,110 +86922,119 @@ var ts;
             return false;
         }
         switch (n.kind) {
-            case 235:
-            case 236:
-            case 238:
-            case 184:
-            case 180:
-            case 166:
-            case 213:
-            case 240:
-            case 241:
-            case 247:
-            case 251:
-                return nodeEndsWith(n, 18, sourceFile);
-            case 269:
+            case 235 /* ClassDeclaration */:
+            case 236 /* InterfaceDeclaration */:
+            case 238 /* EnumDeclaration */:
+            case 184 /* ObjectLiteralExpression */:
+            case 180 /* ObjectBindingPattern */:
+            case 166 /* TypeLiteral */:
+            case 213 /* Block */:
+            case 240 /* ModuleBlock */:
+            case 241 /* CaseBlock */:
+            case 247 /* NamedImports */:
+            case 251 /* NamedExports */:
+                return nodeEndsWith(n, 18 /* CloseBraceToken */, sourceFile);
+            case 269 /* CatchClause */:
                 return isCompletedNode(n.block, sourceFile);
-            case 188:
+            case 188 /* NewExpression */:
                 if (!n.arguments) {
                     return true;
                 }
-            case 187:
-            case 191:
-            case 173:
-                return nodeEndsWith(n, 20, sourceFile);
-            case 163:
-            case 164:
+            // falls through
+            case 187 /* CallExpression */:
+            case 191 /* ParenthesizedExpression */:
+            case 173 /* ParenthesizedType */:
+                return nodeEndsWith(n, 20 /* CloseParenToken */, sourceFile);
+            case 163 /* FunctionType */:
+            case 164 /* ConstructorType */:
                 return isCompletedNode(n.type, sourceFile);
-            case 155:
-            case 156:
-            case 157:
-            case 234:
-            case 192:
-            case 154:
-            case 153:
-            case 159:
-            case 158:
-            case 193:
+            case 155 /* Constructor */:
+            case 156 /* GetAccessor */:
+            case 157 /* SetAccessor */:
+            case 234 /* FunctionDeclaration */:
+            case 192 /* FunctionExpression */:
+            case 154 /* MethodDeclaration */:
+            case 153 /* MethodSignature */:
+            case 159 /* ConstructSignature */:
+            case 158 /* CallSignature */:
+            case 193 /* ArrowFunction */:
                 if (n.body) {
                     return isCompletedNode(n.body, sourceFile);
                 }
                 if (n.type) {
                     return isCompletedNode(n.type, sourceFile);
                 }
-                return hasChildOfKind(n, 20, sourceFile);
-            case 239:
+                // Even though type parameters can be unclosed, we can get away with
+                // having at least a closing paren.
+                return hasChildOfKind(n, 20 /* CloseParenToken */, sourceFile);
+            case 239 /* ModuleDeclaration */:
                 return !!n.body && isCompletedNode(n.body, sourceFile);
-            case 217:
+            case 217 /* IfStatement */:
                 if (n.elseStatement) {
                     return isCompletedNode(n.elseStatement, sourceFile);
                 }
                 return isCompletedNode(n.thenStatement, sourceFile);
-            case 216:
+            case 216 /* ExpressionStatement */:
                 return isCompletedNode(n.expression, sourceFile) ||
-                    hasChildOfKind(n, 25, sourceFile);
-            case 183:
-            case 181:
-            case 186:
-            case 147:
-            case 168:
-                return nodeEndsWith(n, 22, sourceFile);
-            case 160:
+                    hasChildOfKind(n, 25 /* SemicolonToken */, sourceFile);
+            case 183 /* ArrayLiteralExpression */:
+            case 181 /* ArrayBindingPattern */:
+            case 186 /* ElementAccessExpression */:
+            case 147 /* ComputedPropertyName */:
+            case 168 /* TupleType */:
+                return nodeEndsWith(n, 22 /* CloseBracketToken */, sourceFile);
+            case 160 /* IndexSignature */:
                 if (n.type) {
                     return isCompletedNode(n.type, sourceFile);
                 }
-                return hasChildOfKind(n, 22, sourceFile);
-            case 266:
-            case 267:
+                return hasChildOfKind(n, 22 /* CloseBracketToken */, sourceFile);
+            case 266 /* CaseClause */:
+            case 267 /* DefaultClause */:
+                // there is no such thing as terminator token for CaseClause/DefaultClause so for simplicity always consider them non-completed
                 return false;
-            case 220:
-            case 221:
-            case 222:
-            case 219:
+            case 220 /* ForStatement */:
+            case 221 /* ForInStatement */:
+            case 222 /* ForOfStatement */:
+            case 219 /* WhileStatement */:
                 return isCompletedNode(n.statement, sourceFile);
-            case 218:
-                return hasChildOfKind(n, 106, sourceFile)
-                    ? nodeEndsWith(n, 20, sourceFile)
+            case 218 /* DoStatement */:
+                // rough approximation: if DoStatement has While keyword - then if node is completed is checking the presence of ')';
+                return hasChildOfKind(n, 106 /* WhileKeyword */, sourceFile)
+                    ? nodeEndsWith(n, 20 /* CloseParenToken */, sourceFile)
                     : isCompletedNode(n.statement, sourceFile);
-            case 165:
+            case 165 /* TypeQuery */:
                 return isCompletedNode(n.exprName, sourceFile);
-            case 195:
-            case 194:
-            case 196:
-            case 203:
-            case 204:
+            case 195 /* TypeOfExpression */:
+            case 194 /* DeleteExpression */:
+            case 196 /* VoidExpression */:
+            case 203 /* YieldExpression */:
+            case 204 /* SpreadElement */:
                 var unaryWordExpression = n;
                 return isCompletedNode(unaryWordExpression.expression, sourceFile);
-            case 189:
+            case 189 /* TaggedTemplateExpression */:
                 return isCompletedNode(n.template, sourceFile);
-            case 202:
+            case 202 /* TemplateExpression */:
                 var lastSpan = ts.lastOrUndefined(n.templateSpans);
                 return isCompletedNode(lastSpan, sourceFile);
-            case 211:
+            case 211 /* TemplateSpan */:
                 return ts.nodeIsPresent(n.literal);
-            case 250:
-            case 244:
+            case 250 /* ExportDeclaration */:
+            case 244 /* ImportDeclaration */:
                 return ts.nodeIsPresent(n.moduleSpecifier);
-            case 198:
+            case 198 /* PrefixUnaryExpression */:
                 return isCompletedNode(n.operand, sourceFile);
-            case 200:
+            case 200 /* BinaryExpression */:
                 return isCompletedNode(n.right, sourceFile);
-            case 201:
+            case 201 /* ConditionalExpression */:
                 return isCompletedNode(n.whenFalse, sourceFile);
             default:
                 return true;
         }
     }
+    /*
+     * Checks if node ends with 'expectedLastToken'.
+     * If child at position 'length - 1' is 'SemicolonToken' it is skipped and 'expectedLastToken' is compared with child at position 'length - 2'.
+     */
     function nodeEndsWith(n, expectedLastToken, sourceFile) {
         var children = n.getChildren(sourceFile);
         if (children.length) {
@@ -71022,7 +87042,7 @@ var ts;
             if (lastChild.kind === expectedLastToken) {
                 return true;
             }
-            else if (lastChild.kind === 25 && children.length !== 1) {
+            else if (lastChild.kind === 25 /* SemicolonToken */ && children.length !== 1) {
                 return children[children.length - 2].kind === expectedLastToken;
             }
         }
@@ -71030,6 +87050,10 @@ var ts;
     }
     function findListItemInfo(node) {
         var list = findContainingList(node);
+        // It is possible at this point for syntaxList to be undefined, either if
+        // node.parent had no list child, or if none of its list children contained
+        // the span of node. If this happens, return undefined. The caller should
+        // handle this case.
         if (!list) {
             return undefined;
         }
@@ -71050,30 +87074,47 @@ var ts;
     }
     ts.findChildOfKind = findChildOfKind;
     function findContainingList(node) {
+        // The node might be a list element (nonsynthetic) or a comma (synthetic). Either way, it will
+        // be parented by the container of the SyntaxList, not the SyntaxList itself.
+        // In order to find the list item index, we first need to locate SyntaxList itself and then search
+        // for the position of the relevant node (or comma).
         var syntaxList = ts.find(node.parent.getChildren(), function (c) { return ts.isSyntaxList(c) && rangeContainsRange(c, node); });
+        // Either we didn't find an appropriate list, or the list must contain us.
         ts.Debug.assert(!syntaxList || ts.contains(syntaxList.getChildren(), node));
         return syntaxList;
     }
     ts.findContainingList = findContainingList;
-    function getTouchingPropertyName(sourceFile, position, includeJsDocComment) {
-        return getTouchingToken(sourceFile, position, includeJsDocComment, function (n) { return ts.isPropertyNameLiteral(n) || ts.isKeyword(n.kind); });
+    /**
+     * Gets the token whose text has range [start, end) and
+     * position >= start and (position < end or (position === end && token is literal or keyword or identifier))
+     */
+    function getTouchingPropertyName(sourceFile, position) {
+        return getTouchingToken(sourceFile, position, /*includeJsDocComment*/ true, function (n) { return ts.isPropertyNameLiteral(n) || ts.isKeyword(n.kind); });
     }
     ts.getTouchingPropertyName = getTouchingPropertyName;
+    /**
+     * Returns the token if position is in [start, end).
+     * If position === end, returns the preceding token if includeItemAtEndPosition(previousToken) === true
+     */
     function getTouchingToken(sourceFile, position, includeJsDocComment, includePrecedingTokenAtEndPosition) {
-        return getTokenAtPositionWorker(sourceFile, position, false, includePrecedingTokenAtEndPosition, false, includeJsDocComment);
+        return getTokenAtPositionWorker(sourceFile, position, /*allowPositionInLeadingTrivia*/ false, includePrecedingTokenAtEndPosition, /*includeEndPosition*/ false, includeJsDocComment);
     }
     ts.getTouchingToken = getTouchingToken;
+    /** Returns a token if position is in [start-of-leading-trivia, end) */
     function getTokenAtPosition(sourceFile, position, includeJsDocComment, includeEndPosition) {
         if (includeEndPosition === void 0) { includeEndPosition = false; }
-        return getTokenAtPositionWorker(sourceFile, position, true, undefined, includeEndPosition, includeJsDocComment);
+        return getTokenAtPositionWorker(sourceFile, position, /*allowPositionInLeadingTrivia*/ true, /*includePrecedingTokenAtEndPosition*/ undefined, includeEndPosition, includeJsDocComment);
     }
     ts.getTokenAtPosition = getTokenAtPosition;
+    /** Get the token whose text contains the position */
     function getTokenAtPositionWorker(sourceFile, position, allowPositionInLeadingTrivia, includePrecedingTokenAtEndPosition, includeEndPosition, includeJsDocComment) {
         var current = sourceFile;
         outer: while (true) {
             if (ts.isToken(current)) {
+                // exit early
                 return current;
             }
+            // find the child that contains 'position'
             for (var _i = 0, _a = current.getChildren(); _i < _a.length; _i++) {
                 var child = _a[_i];
                 if (!includeJsDocComment && ts.isJSDocNode(child)) {
@@ -71081,10 +87122,11 @@ var ts;
                 }
                 var start = allowPositionInLeadingTrivia ? child.getFullStart() : child.getStart(sourceFile, includeJsDocComment);
                 if (start > position) {
+                    // If this child begins after position, then all subsequent children will as well.
                     break;
                 }
                 var end = child.getEnd();
-                if (position < end || (position === end && (child.kind === 1 || includeEndPosition))) {
+                if (position < end || (position === end && (child.kind === 1 /* EndOfFileToken */ || includeEndPosition))) {
                     current = child;
                     continue outer;
                 }
@@ -71098,8 +87140,18 @@ var ts;
             return current;
         }
     }
+    /**
+     * The token on the left of the position is the token that strictly includes the position
+     * or sits to the left of the cursor if it is on a boundary. For example
+     *
+     *   fo|o               -> will return foo
+     *   foo <comment> |bar -> will return foo
+     *
+     */
     function findTokenOnLeftOfPosition(file, position) {
-        var tokenAtPosition = getTokenAtPosition(file, position, false);
+        // Ideally, getTokenAtPosition should return a token. However, it is currently
+        // broken, so we do a check to make sure the result was indeed a token.
+        var tokenAtPosition = getTokenAtPosition(file, position, /*includeJsDocComment*/ false);
         if (ts.isToken(tokenAtPosition) && position > tokenAtPosition.getStart(file) && position < tokenAtPosition.getEnd()) {
             return tokenAtPosition;
         }
@@ -71110,12 +87162,16 @@ var ts;
         return find(parent);
         function find(n) {
             if (ts.isToken(n) && n.pos === previousToken.end) {
+                // this is token that starts at the end of previous token - return it
                 return n;
             }
             var children = n.getChildren();
-            for (var _i = 0, children_3 = children; _i < children_3.length; _i++) {
-                var child = children_3[_i];
-                var shouldDiveInChildNode = (child.pos <= previousToken.pos && child.end > previousToken.end) ||
+            for (var _i = 0, children_1 = children; _i < children_1.length; _i++) {
+                var child = children_1[_i];
+                var shouldDiveInChildNode = 
+                // previous token is enclosed somewhere in the child
+                (child.pos <= previousToken.pos && child.end > previousToken.end) ||
+                    // previous token ends exactly at the beginning of child
                     (child.pos === previousToken.end);
                 if (shouldDiveInChildNode && nodeHasTokens(child, sourceFile)) {
                     return find(child);
@@ -71125,6 +87181,10 @@ var ts;
         }
     }
     ts.findNextToken = findNextToken;
+    /**
+     * Finds the rightmost token satisfying `token.end <= position`,
+     * excluding `JsxText` tokens containing only whitespace.
+     */
     function findPrecedingToken(position, sourceFile, startNode, includeJsDoc) {
         var result = find(startNode || sourceFile);
         ts.Debug.assert(!(result && isWhiteSpaceOnlyJsxText(result)));
@@ -71136,23 +87196,34 @@ var ts;
             var children = n.getChildren(sourceFile);
             for (var i = 0; i < children.length; i++) {
                 var child = children[i];
+                // Note that the span of a node's tokens is [node.getStart(...), node.end).
+                // Given that `position < child.end` and child has constituent tokens, we distinguish these cases:
+                // 1) `position` precedes `child`'s tokens or `child` has no tokens (ie: in a comment or whitespace preceding `child`):
+                // we need to find the last token in a previous child.
+                // 2) `position` is within the same span: we recurse on `child`.
                 if (position < child.end) {
                     var start = child.getStart(sourceFile, includeJsDoc);
-                    var lookInPreviousChild = (start >= position) ||
+                    var lookInPreviousChild = (start >= position) || // cursor in the leading trivia
                         !nodeHasTokens(child, sourceFile) ||
                         isWhiteSpaceOnlyJsxText(child);
                     if (lookInPreviousChild) {
-                        var candidate = findRightmostChildNodeWithTokens(children, i, sourceFile);
+                        // actual start of the node is past the position - previous token should be at the end of previous child
+                        var candidate = findRightmostChildNodeWithTokens(children, /*exclusiveStartPosition*/ i, sourceFile);
                         return candidate && findRightmostToken(candidate, sourceFile);
                     }
                     else {
+                        // candidate should be in this node
                         return find(child);
                     }
                 }
             }
-            ts.Debug.assert(startNode !== undefined || n.kind === 274 || ts.isJSDocCommentContainingNode(n));
+            ts.Debug.assert(startNode !== undefined || n.kind === 274 /* SourceFile */ || ts.isJSDocCommentContainingNode(n));
+            // Here we know that none of child token nodes embrace the position,
+            // the only known case is when position is at the end of the file.
+            // Try to find the rightmost token in the file without filtering.
+            // Namely we are skipping the check: 'position < node.end'
             if (children.length) {
-                var candidate = findRightmostChildNodeWithTokens(children, children.length, sourceFile);
+                var candidate = findRightmostChildNodeWithTokens(children, /*exclusiveStartPosition*/ children.length, sourceFile);
                 return candidate && findRightmostToken(candidate, sourceFile);
             }
         }
@@ -71166,9 +87237,12 @@ var ts;
             return n;
         }
         var children = n.getChildren(sourceFile);
-        var candidate = findRightmostChildNodeWithTokens(children, children.length, sourceFile);
+        var candidate = findRightmostChildNodeWithTokens(children, /*exclusiveStartPosition*/ children.length, sourceFile);
         return candidate && findRightmostToken(candidate, sourceFile);
     }
+    /**
+     * Finds the rightmost child to the left of `children[exclusiveStartPosition]` which is a non-all-whitespace token or has constituent tokens.
+     */
     function findRightmostChildNodeWithTokens(children, exclusiveStartPosition, sourceFile) {
         for (var i = exclusiveStartPosition - 1; i >= 0; i--) {
             var child = children[i];
@@ -71185,6 +87259,10 @@ var ts;
         if (previousToken && ts.isStringTextContainingNode(previousToken)) {
             var start = previousToken.getStart(sourceFile);
             var end = previousToken.getEnd();
+            // To be "in" one of these literals, the position has to be:
+            //   1. entirely within the token text.
+            //   2. at the end position of an unterminated token.
+            //   3. at the end of a regular expression (due to trailing flags like '/foo/g').
             if (start < position && position < end) {
                 return true;
             }
@@ -71195,24 +87273,33 @@ var ts;
         return false;
     }
     ts.isInString = isInString;
+    /**
+     * returns true if the position is in between the open and close elements of an JSX expression.
+     */
     function isInsideJsxElementOrAttribute(sourceFile, position) {
-        var token = getTokenAtPosition(sourceFile, position, false);
+        var token = getTokenAtPosition(sourceFile, position, /*includeJsDocComment*/ false);
         if (!token) {
             return false;
         }
-        if (token.kind === 10) {
+        if (token.kind === 10 /* JsxText */) {
             return true;
         }
-        if (token.kind === 27 && token.parent.kind === 10) {
+        // <div>Hello |</div>
+        if (token.kind === 27 /* LessThanToken */ && token.parent.kind === 10 /* JsxText */) {
             return true;
         }
-        if (token.kind === 27 && token.parent.kind === 265) {
+        // <div> { | </div> or <div a={| </div>
+        if (token.kind === 27 /* LessThanToken */ && token.parent.kind === 265 /* JsxExpression */) {
             return true;
         }
-        if (token && token.kind === 18 && token.parent.kind === 265) {
+        // <div> {
+        // |
+        // } < /div>
+        if (token && token.kind === 18 /* CloseBraceToken */ && token.parent.kind === 265 /* JsxExpression */) {
             return true;
         }
-        if (token.kind === 27 && token.parent.kind === 258) {
+        // <div>|</div>
+        if (token.kind === 27 /* LessThanToken */ && token.parent.kind === 258 /* JsxClosingElement */) {
             return true;
         }
         return false;
@@ -71222,7 +87309,7 @@ var ts;
         return ts.isJsxText(node) && node.containsOnlyWhiteSpaces;
     }
     function isInTemplateString(sourceFile, position) {
-        var token = getTokenAtPosition(sourceFile, position, false);
+        var token = getTokenAtPosition(sourceFile, position, /*includeJsDocComment*/ false);
         return ts.isTemplateLiteralKind(token.kind) && position > token.getStart(sourceFile);
     }
     ts.isInTemplateString = isInTemplateString;
@@ -71249,11 +87336,17 @@ var ts;
     ts.findPrecedingMatchingToken = findPrecedingMatchingToken;
     function isPossiblyTypeArgumentPosition(tokenIn, sourceFile) {
         var token = tokenIn;
+        // This function determines if the node could be type argument position
+        // Since during editing, when type argument list is not complete,
+        // the tree could be of any shape depending on the tokens parsed before current node,
+        // scanning of the previous identifier followed by "<" before current node would give us better result
+        // Note that we also balance out the already provided type arguments, arrays, object literals while doing so
         var remainingLessThanTokens = 0;
         var nTypeArguments = 0;
         while (token) {
             switch (token.kind) {
-                case 27:
+                case 27 /* LessThanToken */:
+                    // Found the beginning of the generic argument expression
                     token = findPrecedingToken(token.getFullStart(), sourceFile);
                     if (!token || !ts.isIdentifier(token))
                         return undefined;
@@ -71262,51 +87355,59 @@ var ts;
                     }
                     remainingLessThanTokens--;
                     break;
-                case 47:
+                case 47 /* GreaterThanGreaterThanGreaterThanToken */:
                     remainingLessThanTokens = +3;
                     break;
-                case 46:
+                case 46 /* GreaterThanGreaterThanToken */:
                     remainingLessThanTokens = +2;
                     break;
-                case 29:
+                case 29 /* GreaterThanToken */:
                     remainingLessThanTokens++;
                     break;
-                case 18:
-                    token = findPrecedingMatchingToken(token, 17, sourceFile);
+                case 18 /* CloseBraceToken */:
+                    // This can be object type, skip until we find the matching open brace token
+                    // Skip until the matching open brace token
+                    token = findPrecedingMatchingToken(token, 17 /* OpenBraceToken */, sourceFile);
                     if (!token)
                         return undefined;
                     break;
-                case 20:
-                    token = findPrecedingMatchingToken(token, 19, sourceFile);
+                case 20 /* CloseParenToken */:
+                    // This can be object type, skip until we find the matching open brace token
+                    // Skip until the matching open brace token
+                    token = findPrecedingMatchingToken(token, 19 /* OpenParenToken */, sourceFile);
                     if (!token)
                         return undefined;
                     break;
-                case 22:
-                    token = findPrecedingMatchingToken(token, 21, sourceFile);
+                case 22 /* CloseBracketToken */:
+                    // This can be object type, skip until we find the matching open brace token
+                    // Skip until the matching open brace token
+                    token = findPrecedingMatchingToken(token, 21 /* OpenBracketToken */, sourceFile);
                     if (!token)
                         return undefined;
                     break;
-                case 26:
+                // Valid tokens in a type name. Skip.
+                case 26 /* CommaToken */:
                     nTypeArguments++;
                     break;
-                case 36:
-                case 71:
-                case 9:
-                case 8:
-                case 101:
-                case 86:
-                case 103:
-                case 85:
-                case 128:
-                case 23:
-                case 49:
-                case 55:
-                case 56:
+                case 36 /* EqualsGreaterThanToken */:
+                case 71 /* Identifier */:
+                case 9 /* StringLiteral */:
+                case 8 /* NumericLiteral */:
+                case 101 /* TrueKeyword */:
+                case 86 /* FalseKeyword */:
+                case 103 /* TypeOfKeyword */:
+                case 85 /* ExtendsKeyword */:
+                case 128 /* KeyOfKeyword */:
+                case 23 /* DotToken */:
+                case 49 /* BarToken */:
+                case 55 /* QuestionToken */:
+                case 56 /* ColonToken */:
                     break;
                 default:
                     if (ts.isTypeNode(token)) {
                         break;
                     }
+                    // Invalid token in type
                     return undefined;
             }
             token = findPrecedingToken(token.getFullStart(), sourceFile);
@@ -71314,12 +87415,19 @@ var ts;
         return undefined;
     }
     ts.isPossiblyTypeArgumentPosition = isPossiblyTypeArgumentPosition;
+    /**
+     * Returns true if the cursor at position in sourceFile is within a comment.
+     *
+     * @param tokenAtPosition Must equal `getTokenAtPosition(sourceFile, position)
+     * @param predicate Additional predicate to test on the comment range.
+     */
     function isInComment(sourceFile, position, tokenAtPosition, predicate) {
-        return !!ts.formatting.getRangeOfEnclosingComment(sourceFile, position, false, undefined, tokenAtPosition, predicate);
+        return !!ts.formatting.getRangeOfEnclosingComment(sourceFile, position, /*onlyMultiLine*/ false, /*precedingToken*/ undefined, tokenAtPosition, predicate);
     }
     ts.isInComment = isInComment;
     function hasDocComment(sourceFile, position) {
-        var token = getTokenAtPosition(sourceFile, position, false);
+        var token = getTokenAtPosition(sourceFile, position, /*includeJsDocComment*/ false);
+        // First, we have to see if this position actually landed in a comment.
         var commentRanges = ts.getLeadingCommentRanges(sourceFile.text, token.pos);
         return ts.forEach(commentRanges, jsDocPrefix);
         function jsDocPrefix(c) {
@@ -71329,45 +87437,47 @@ var ts;
     }
     ts.hasDocComment = hasDocComment;
     function nodeHasTokens(n, sourceFile) {
+        // If we have a token or node that has a non-zero width, it must have tokens.
+        // Note: getWidth() does not take trivia into account.
         return n.getWidth(sourceFile) !== 0;
     }
     function getNodeModifiers(node) {
         var flags = ts.getCombinedModifierFlags(node);
         var result = [];
-        if (flags & 8)
-            result.push("private");
-        if (flags & 16)
-            result.push("protected");
-        if (flags & 4)
-            result.push("public");
-        if (flags & 32)
-            result.push("static");
-        if (flags & 128)
-            result.push("abstract");
-        if (flags & 1)
-            result.push("export");
-        if (node.flags & 4194304)
-            result.push("declare");
-        return result.length > 0 ? result.join(",") : "";
+        if (flags & 8 /* Private */)
+            result.push("private" /* privateMemberModifier */);
+        if (flags & 16 /* Protected */)
+            result.push("protected" /* protectedMemberModifier */);
+        if (flags & 4 /* Public */)
+            result.push("public" /* publicMemberModifier */);
+        if (flags & 32 /* Static */)
+            result.push("static" /* staticModifier */);
+        if (flags & 128 /* Abstract */)
+            result.push("abstract" /* abstractModifier */);
+        if (flags & 1 /* Export */)
+            result.push("export" /* exportedModifier */);
+        if (node.flags & 4194304 /* Ambient */)
+            result.push("declare" /* ambientModifier */);
+        return result.length > 0 ? result.join(",") : "" /* none */;
     }
     ts.getNodeModifiers = getNodeModifiers;
     function getTypeArgumentOrTypeParameterList(node) {
-        if (node.kind === 162 || node.kind === 187) {
+        if (node.kind === 162 /* TypeReference */ || node.kind === 187 /* CallExpression */) {
             return node.typeArguments;
         }
-        if (ts.isFunctionLike(node) || node.kind === 235 || node.kind === 236) {
+        if (ts.isFunctionLike(node) || node.kind === 235 /* ClassDeclaration */ || node.kind === 236 /* InterfaceDeclaration */) {
             return node.typeParameters;
         }
         return undefined;
     }
     ts.getTypeArgumentOrTypeParameterList = getTypeArgumentOrTypeParameterList;
     function isComment(kind) {
-        return kind === 2 || kind === 3;
+        return kind === 2 /* SingleLineCommentTrivia */ || kind === 3 /* MultiLineCommentTrivia */;
     }
     ts.isComment = isComment;
     function isStringOrRegularExpressionOrTemplateLiteral(kind) {
-        if (kind === 9
-            || kind === 12
+        if (kind === 9 /* StringLiteral */
+            || kind === 12 /* RegularExpressionLiteral */
             || ts.isTemplateLiteralKind(kind)) {
             return true;
         }
@@ -71375,7 +87485,7 @@ var ts;
     }
     ts.isStringOrRegularExpressionOrTemplateLiteral = isStringOrRegularExpressionOrTemplateLiteral;
     function isPunctuation(kind) {
-        return 17 <= kind && kind <= 70;
+        return 17 /* FirstPunctuation */ <= kind && kind <= 70 /* LastPunctuation */;
     }
     ts.isPunctuation = isPunctuation;
     function isInsideTemplateLiteral(node, position, sourceFile) {
@@ -71385,9 +87495,9 @@ var ts;
     ts.isInsideTemplateLiteral = isInsideTemplateLiteral;
     function isAccessibilityModifier(kind) {
         switch (kind) {
-            case 114:
-            case 112:
-            case 113:
+            case 114 /* PublicKeyword */:
+            case 112 /* PrivateKeyword */:
+            case 113 /* ProtectedKeyword */:
                 return true;
         }
         return false;
@@ -71400,18 +87510,26 @@ var ts;
     }
     ts.cloneCompilerOptions = cloneCompilerOptions;
     function isArrayLiteralOrObjectLiteralDestructuringPattern(node) {
-        if (node.kind === 183 ||
-            node.kind === 184) {
-            if (node.parent.kind === 200 &&
+        if (node.kind === 183 /* ArrayLiteralExpression */ ||
+            node.kind === 184 /* ObjectLiteralExpression */) {
+            // [a,b,c] from:
+            // [a, b, c] = someExpression;
+            if (node.parent.kind === 200 /* BinaryExpression */ &&
                 node.parent.left === node &&
-                node.parent.operatorToken.kind === 58) {
+                node.parent.operatorToken.kind === 58 /* EqualsToken */) {
                 return true;
             }
-            if (node.parent.kind === 222 &&
+            // [a, b, c] from:
+            // for([a, b, c] of expression)
+            if (node.parent.kind === 222 /* ForOfStatement */ &&
                 node.parent.initializer === node) {
                 return true;
             }
-            if (isArrayLiteralOrObjectLiteralDestructuringPattern(node.parent.kind === 270 ? node.parent.parent : node.parent)) {
+            // [a, b, c] of
+            // [x, [a, b, c] ] = someExpression
+            // or
+            // {x, a: {a, b, c} } = someExpression
+            if (isArrayLiteralOrObjectLiteralDestructuringPattern(node.parent.kind === 270 /* PropertyAssignment */ ? node.parent.parent : node.parent)) {
                 return true;
             }
         }
@@ -71419,14 +87537,14 @@ var ts;
     }
     ts.isArrayLiteralOrObjectLiteralDestructuringPattern = isArrayLiteralOrObjectLiteralDestructuringPattern;
     function isInReferenceComment(sourceFile, position) {
-        return isInComment(sourceFile, position, undefined, function (c) {
+        return isInComment(sourceFile, position, /*tokenAtPosition*/ undefined, function (c) {
             var commentText = sourceFile.text.substring(c.pos, c.end);
             return tripleSlashDirectivePrefixRegex.test(commentText);
         });
     }
     ts.isInReferenceComment = isInReferenceComment;
     function isInNonReferenceComment(sourceFile, position) {
-        return isInComment(sourceFile, position, undefined, function (c) {
+        return isInComment(sourceFile, position, /*tokenAtPosition*/ undefined, function (c) {
             var commentText = sourceFile.text.substring(c.pos, c.end);
             return !tripleSlashDirectivePrefixRegex.test(commentText);
         });
@@ -71453,27 +87571,28 @@ var ts;
     }
     ts.createTextChange = createTextChange;
     ts.typeKeywords = [
-        119,
-        122,
-        128,
-        131,
-        95,
-        134,
-        135,
-        137,
-        138,
-        105,
-        140,
-        141,
-        142,
+        119 /* AnyKeyword */,
+        122 /* BooleanKeyword */,
+        128 /* KeyOfKeyword */,
+        131 /* NeverKeyword */,
+        95 /* NullKeyword */,
+        134 /* NumberKeyword */,
+        135 /* ObjectKeyword */,
+        137 /* StringKeyword */,
+        138 /* SymbolKeyword */,
+        105 /* VoidKeyword */,
+        140 /* UndefinedKeyword */,
+        141 /* UniqueKeyword */,
+        142 /* UnknownKeyword */,
     ];
     function isTypeKeyword(kind) {
         return ts.contains(ts.typeKeywords, kind);
     }
     ts.isTypeKeyword = isTypeKeyword;
+    /** True if the symbol is for an external module, as opposed to a namespace. */
     function isExternalModuleSymbol(moduleSymbol) {
-        ts.Debug.assert(!!(moduleSymbol.flags & 1536));
-        return moduleSymbol.name.charCodeAt(0) === 34;
+        ts.Debug.assert(!!(moduleSymbol.flags & 1536 /* Module */));
+        return moduleSymbol.name.charCodeAt(0) === 34 /* doubleQuote */;
     }
     ts.isExternalModuleSymbol = isExternalModuleSymbol;
     function nodeSeenTracker() {
@@ -71497,11 +87616,12 @@ var ts;
     }
     ts.repeatString = repeatString;
     function skipConstraint(type) {
-        return type.isTypeParameter() ? type.getConstraint() : type;
+        return type.isTypeParameter() ? type.getConstraint() : type; // TODO: GH#18217
     }
     ts.skipConstraint = skipConstraint;
     function getNameFromPropertyName(name) {
-        return name.kind === 147
+        return name.kind === 147 /* ComputedPropertyName */
+            // treat computed property names where expression is string/numeric literal as just string/numeric literal
             ? ts.isStringOrNumericLiteral(name.expression) ? name.expression.text : undefined
             : ts.getTextOfIdentifierOrLiteral(name);
     }
@@ -71511,7 +87631,7 @@ var ts;
     }
     ts.programContainsEs6Modules = programContainsEs6Modules;
     function compilerOptionsIndicateEs6Modules(compilerOptions) {
-        return !!compilerOptions.module || compilerOptions.target >= 2 || !!compilerOptions.noEmit;
+        return !!compilerOptions.module || compilerOptions.target >= 2 /* ES2015 */ || !!compilerOptions.noEmit;
     }
     ts.compilerOptionsIndicateEs6Modules = compilerOptionsIndicateEs6Modules;
     function hostUsesCaseSensitiveFileNames(host) {
@@ -71522,50 +87642,85 @@ var ts;
         return ts.createGetCanonicalFileName(hostUsesCaseSensitiveFileNames(host));
     }
     ts.hostGetCanonicalFileName = hostGetCanonicalFileName;
-    function makeImportIfNecessary(defaultImport, namedImports, moduleSpecifier, preferences) {
-        return defaultImport || namedImports && namedImports.length ? makeImport(defaultImport, namedImports, moduleSpecifier, preferences) : undefined;
+    function makeImportIfNecessary(defaultImport, namedImports, moduleSpecifier, quotePreference) {
+        return defaultImport || namedImports && namedImports.length ? makeImport(defaultImport, namedImports, moduleSpecifier, quotePreference) : undefined;
     }
     ts.makeImportIfNecessary = makeImportIfNecessary;
-    function makeImport(defaultImport, namedImports, moduleSpecifier, preferences) {
-        return ts.createImportDeclaration(undefined, undefined, defaultImport || namedImports
+    function makeImport(defaultImport, namedImports, moduleSpecifier, quotePreference) {
+        return ts.createImportDeclaration(
+        /*decorators*/ undefined, 
+        /*modifiers*/ undefined, defaultImport || namedImports
             ? ts.createImportClause(defaultImport, namedImports && namedImports.length ? ts.createNamedImports(namedImports) : undefined)
-            : undefined, typeof moduleSpecifier === "string" ? ts.createLiteral(moduleSpecifier, preferences.quotePreference === "single") : moduleSpecifier);
+            : undefined, typeof moduleSpecifier === "string" ? makeStringLiteral(moduleSpecifier, quotePreference) : moduleSpecifier);
     }
     ts.makeImport = makeImport;
+    function makeStringLiteral(text, quotePreference) {
+        return ts.createLiteral(text, quotePreference === 0 /* Single */);
+    }
+    ts.makeStringLiteral = makeStringLiteral;
+    var QuotePreference;
+    (function (QuotePreference) {
+        QuotePreference[QuotePreference["Single"] = 0] = "Single";
+        QuotePreference[QuotePreference["Double"] = 1] = "Double";
+    })(QuotePreference = ts.QuotePreference || (ts.QuotePreference = {}));
+    function getQuotePreference(sourceFile, preferences) {
+        if (preferences.quotePreference) {
+            return preferences.quotePreference === "single" ? 0 /* Single */ : 1 /* Double */;
+        }
+        else {
+            var firstModuleSpecifier = ts.firstOrUndefined(sourceFile.imports);
+            return !!firstModuleSpecifier && !ts.isStringDoubleQuoted(firstModuleSpecifier, sourceFile) ? 0 /* Single */ : 1 /* Double */;
+        }
+    }
+    ts.getQuotePreference = getQuotePreference;
     function symbolNameNoDefault(symbol) {
         var escaped = symbolEscapedNameNoDefault(symbol);
         return escaped === undefined ? undefined : ts.unescapeLeadingUnderscores(escaped);
     }
     ts.symbolNameNoDefault = symbolNameNoDefault;
     function symbolEscapedNameNoDefault(symbol) {
-        if (symbol.escapedName !== "default") {
+        if (symbol.escapedName !== "default" /* Default */) {
             return symbol.escapedName;
         }
         return ts.firstDefined(symbol.declarations, function (decl) {
             var name = ts.getNameOfDeclaration(decl);
-            return name && name.kind === 71 ? name.escapedText : undefined;
+            return name && name.kind === 71 /* Identifier */ ? name.escapedText : undefined;
         });
     }
     ts.symbolEscapedNameNoDefault = symbolEscapedNameNoDefault;
     function getPropertySymbolFromBindingElement(checker, bindingElement) {
         var typeOfPattern = checker.getTypeAtLocation(bindingElement.parent);
         var propSymbol = typeOfPattern && checker.getPropertyOfType(typeOfPattern, bindingElement.name.text);
-        if (propSymbol && propSymbol.flags & 98304) {
-            ts.Debug.assert(!!(propSymbol.flags & 33554432));
+        if (propSymbol && propSymbol.flags & 98304 /* Accessor */) {
+            // See GH#16922
+            ts.Debug.assert(!!(propSymbol.flags & 33554432 /* Transient */));
             return propSymbol.target;
         }
         return propSymbol;
     }
     ts.getPropertySymbolFromBindingElement = getPropertySymbolFromBindingElement;
+    /**
+     * Find symbol of the given property-name and add the symbol to the given result array
+     * @param symbol a symbol to start searching for the given propertyName
+     * @param propertyName a name of property to search for
+     * @param result an array of symbol of found property symbols
+     * @param previousIterationSymbolsCache a cache of symbol from previous iterations of calling this function to prevent infinite revisiting of the same symbol.
+     *                                The value of previousIterationSymbol is undefined when the function is first called.
+     */
     function getPropertySymbolsFromBaseTypes(symbol, propertyName, checker, cb) {
         var seen = ts.createMap();
         return recur(symbol);
         function recur(symbol) {
-            if (!(symbol.flags & (32 | 64)) || !ts.addToSeen(seen, ts.getSymbolId(symbol)))
+            // Use `addToSeen` to ensure we don't infinitely recurse in this situation:
+            //      interface C extends C {
+            //          /*findRef*/propName: string;
+            //      }
+            if (!(symbol.flags & (32 /* Class */ | 64 /* Interface */)) || !ts.addToSeen(seen, ts.getSymbolId(symbol)))
                 return;
             return ts.firstDefined(symbol.declarations, function (declaration) { return ts.firstDefined(ts.getAllSuperTypeNodes(declaration), function (typeReference) {
                 var type = checker.getTypeAtLocation(typeReference);
                 var propertySymbol = type && type.symbol && checker.getPropertyOfType(type, propertyName);
+                // Visit the typeReference as well to see if it directly or indirectly uses that property
                 return type && propertySymbol && (ts.firstDefined(checker.getRootSymbols(propertySymbol), cb) || recur(type.symbol));
             }); });
         }
@@ -71575,7 +87730,7 @@ var ts;
         return getPropertySymbolsFromBaseTypes(memberSymbol.parent, memberSymbol.name, checker, function (_) { return true; }) || false;
     }
     ts.isMemberSymbolInBaseType = isMemberSymbolInBaseType;
-    var NodeSet = (function () {
+    var NodeSet = /** @class */ (function () {
         function NodeSet() {
             this.map = ts.createMap();
         }
@@ -71610,9 +87765,11 @@ var ts;
             node.getEnd() <= ts.textSpanEnd(span);
     }
 })(ts || (ts = {}));
+// Display-part writer helpers
+/* @internal */
 (function (ts) {
     function isFirstDeclarationOfSymbolParameter(symbol) {
-        return symbol.declarations && symbol.declarations.length > 0 && symbol.declarations[0].kind === 149;
+        return symbol.declarations && symbol.declarations.length > 0 && symbol.declarations[0].kind === 149 /* Parameter */;
     }
     ts.isFirstDeclarationOfSymbolParameter = isFirstDeclarationOfSymbolParameter;
     var displayPartWriter = getDisplayPartWriter();
@@ -71682,46 +87839,46 @@ var ts;
         return displayPart(text, displayPartKind(symbol));
         function displayPartKind(symbol) {
             var flags = symbol.flags;
-            if (flags & 3) {
+            if (flags & 3 /* Variable */) {
                 return isFirstDeclarationOfSymbolParameter(symbol) ? ts.SymbolDisplayPartKind.parameterName : ts.SymbolDisplayPartKind.localName;
             }
-            else if (flags & 4) {
+            else if (flags & 4 /* Property */) {
                 return ts.SymbolDisplayPartKind.propertyName;
             }
-            else if (flags & 32768) {
+            else if (flags & 32768 /* GetAccessor */) {
                 return ts.SymbolDisplayPartKind.propertyName;
             }
-            else if (flags & 65536) {
+            else if (flags & 65536 /* SetAccessor */) {
                 return ts.SymbolDisplayPartKind.propertyName;
             }
-            else if (flags & 8) {
+            else if (flags & 8 /* EnumMember */) {
                 return ts.SymbolDisplayPartKind.enumMemberName;
             }
-            else if (flags & 16) {
+            else if (flags & 16 /* Function */) {
                 return ts.SymbolDisplayPartKind.functionName;
             }
-            else if (flags & 32) {
+            else if (flags & 32 /* Class */) {
                 return ts.SymbolDisplayPartKind.className;
             }
-            else if (flags & 64) {
+            else if (flags & 64 /* Interface */) {
                 return ts.SymbolDisplayPartKind.interfaceName;
             }
-            else if (flags & 384) {
+            else if (flags & 384 /* Enum */) {
                 return ts.SymbolDisplayPartKind.enumName;
             }
-            else if (flags & 1536) {
+            else if (flags & 1536 /* Module */) {
                 return ts.SymbolDisplayPartKind.moduleName;
             }
-            else if (flags & 8192) {
+            else if (flags & 8192 /* Method */) {
                 return ts.SymbolDisplayPartKind.methodName;
             }
-            else if (flags & 262144) {
+            else if (flags & 262144 /* TypeParameter */) {
                 return ts.SymbolDisplayPartKind.typeParameterName;
             }
-            else if (flags & 524288) {
+            else if (flags & 524288 /* TypeAlias */) {
                 return ts.SymbolDisplayPartKind.aliasName;
             }
-            else if (flags & 2097152) {
+            else if (flags & 2097152 /* Alias */) {
                 return ts.SymbolDisplayPartKind.aliasName;
             }
             return ts.SymbolDisplayPartKind.text;
@@ -71760,6 +87917,9 @@ var ts;
     }
     ts.textPart = textPart;
     var carriageReturnLineFeed = "\r\n";
+    /**
+     * The default is CRLF.
+     */
     function getNewLineOrDefaultFromHost(host, formatSettings) {
         return (formatSettings && formatSettings.newLineCharacter) ||
             (host.getNewLine && host.getNewLine()) ||
@@ -71770,6 +87930,7 @@ var ts;
         return displayPart("\n", ts.SymbolDisplayPartKind.lineBreak);
     }
     ts.lineBreakPart = lineBreakPart;
+    /* @internal */
     function mapToDisplayParts(writeDisplayParts) {
         try {
             writeDisplayParts(displayPartWriter);
@@ -71781,33 +87942,38 @@ var ts;
     }
     ts.mapToDisplayParts = mapToDisplayParts;
     function typeToDisplayParts(typechecker, type, enclosingDeclaration, flags) {
-        if (flags === void 0) { flags = 0; }
+        if (flags === void 0) { flags = 0 /* None */; }
         return mapToDisplayParts(function (writer) {
-            typechecker.writeType(type, enclosingDeclaration, flags | 1024 | 16384, writer);
+            typechecker.writeType(type, enclosingDeclaration, flags | 1024 /* MultilineObjectLiterals */ | 16384 /* UseAliasDefinedOutsideCurrentScope */, writer);
         });
     }
     ts.typeToDisplayParts = typeToDisplayParts;
     function symbolToDisplayParts(typeChecker, symbol, enclosingDeclaration, meaning, flags) {
-        if (flags === void 0) { flags = 0; }
+        if (flags === void 0) { flags = 0 /* None */; }
         return mapToDisplayParts(function (writer) {
-            typeChecker.writeSymbol(symbol, enclosingDeclaration, meaning, flags | 8, writer);
+            typeChecker.writeSymbol(symbol, enclosingDeclaration, meaning, flags | 8 /* UseAliasDefinedOutsideCurrentScope */, writer);
         });
     }
     ts.symbolToDisplayParts = symbolToDisplayParts;
     function signatureToDisplayParts(typechecker, signature, enclosingDeclaration, flags) {
-        if (flags === void 0) { flags = 0; }
-        flags |= 16384 | 1024 | 32 | 8192;
+        if (flags === void 0) { flags = 0 /* None */; }
+        flags |= 16384 /* UseAliasDefinedOutsideCurrentScope */ | 1024 /* MultilineObjectLiterals */ | 32 /* WriteTypeArgumentsOfSignature */ | 8192 /* OmitParameterModifiers */;
         return mapToDisplayParts(function (writer) {
-            typechecker.writeSignature(signature, enclosingDeclaration, flags, undefined, writer);
+            typechecker.writeSignature(signature, enclosingDeclaration, flags, /*signatureKind*/ undefined, writer);
         });
     }
     ts.signatureToDisplayParts = signatureToDisplayParts;
     function isImportOrExportSpecifierName(location) {
         return !!location.parent &&
-            (location.parent.kind === 248 || location.parent.kind === 252) &&
+            (location.parent.kind === 248 /* ImportSpecifier */ || location.parent.kind === 252 /* ExportSpecifier */) &&
             location.parent.propertyName === location;
     }
     ts.isImportOrExportSpecifierName = isImportOrExportSpecifierName;
+    /**
+     * Strip off existed single quotes or double quotes from a given string
+     *
+     * @return non-quoted string
+     */
     function stripQuotes(name) {
         var length = name.length;
         if (length >= 2 && name.charCodeAt(0) === name.charCodeAt(length - 1) && startsWithQuote(name)) {
@@ -71830,6 +87996,8 @@ var ts;
     }
     ts.scriptKindIs = scriptKindIs;
     function getScriptKind(fileName, host) {
+        // First check to see if the script kind was specified by the host. Chances are the host
+        // may override the default script kind for the file extension.
         return ts.ensureScriptKind(fileName, host && host.getScriptKind && host.getScriptKind(fileName));
     }
     ts.getScriptKind = getScriptKind;
@@ -71844,6 +88012,12 @@ var ts;
         return position;
     }
     ts.getFirstNonSpaceCharacterPosition = getFirstNonSpaceCharacterPosition;
+    /**
+     * Creates a deep, memberwise clone of a node with no source map location.
+     *
+     * WARNING: This is an expensive operation and is only intended to be used in refactorings
+     * and code fixes (because those are triggered by explicit user actions).
+     */
     function getSynthesizedDeepClone(node, includeTrivia) {
         if (includeTrivia === void 0) { includeTrivia = true; }
         var clone = node && getSynthesizedDeepCloneWorker(node);
@@ -71855,15 +88029,19 @@ var ts;
     function getSynthesizedDeepCloneWorker(node) {
         var visited = ts.visitEachChild(node, getSynthesizedDeepClone, ts.nullTransformationContext);
         if (visited === node) {
-            var clone_7 = ts.getSynthesizedClone(node);
-            if (ts.isStringLiteral(clone_7)) {
-                clone_7.textSourceNode = node;
+            // This only happens for leaf nodes - internal nodes always see their children change.
+            var clone_1 = ts.getSynthesizedClone(node);
+            if (ts.isStringLiteral(clone_1)) {
+                clone_1.textSourceNode = node;
             }
-            else if (ts.isNumericLiteral(clone_7)) {
-                clone_7.numericLiteralFlags = node.numericLiteralFlags;
+            else if (ts.isNumericLiteral(clone_1)) {
+                clone_1.numericLiteralFlags = node.numericLiteralFlags;
             }
-            return ts.setTextRange(clone_7, node);
+            return ts.setTextRange(clone_1, node);
         }
+        // PERF: As an optimization, rather than calling getSynthesizedClone, we'll update
+        // the new node created by visitEachChild with the extra changes getSynthesizedClone
+        // would have made.
         visited.parent = undefined;
         return visited;
     }
@@ -71872,17 +88050,29 @@ var ts;
         return nodes && ts.createNodeArray(nodes.map(function (n) { return getSynthesizedDeepClone(n, includeTrivia); }), nodes.hasTrailingComma);
     }
     ts.getSynthesizedDeepClones = getSynthesizedDeepClones;
+    /**
+     * Sets EmitFlags to suppress leading and trailing trivia on the node.
+     */
+    /* @internal */
     function suppressLeadingAndTrailingTrivia(node) {
         suppressLeadingTrivia(node);
         suppressTrailingTrivia(node);
     }
     ts.suppressLeadingAndTrailingTrivia = suppressLeadingAndTrailingTrivia;
+    /**
+     * Sets EmitFlags to suppress leading trivia on the node.
+     */
+    /* @internal */
     function suppressLeadingTrivia(node) {
-        addEmitFlagsRecursively(node, 512, getFirstChild);
+        addEmitFlagsRecursively(node, 512 /* NoLeadingComments */, getFirstChild);
     }
     ts.suppressLeadingTrivia = suppressLeadingTrivia;
+    /**
+     * Sets EmitFlags to suppress trailing trivia on the node.
+     */
+    /* @internal */
     function suppressTrailingTrivia(node) {
-        addEmitFlagsRecursively(node, 1024, ts.getLastChild);
+        addEmitFlagsRecursively(node, 1024 /* NoTrailingComments */, ts.getLastChild);
     }
     ts.suppressTrailingTrivia = suppressTrailingTrivia;
     function addEmitFlagsRecursively(node, flag, getChild) {
@@ -71894,6 +88084,7 @@ var ts;
     function getFirstChild(node) {
         return node.forEachChild(function (child) { return child; });
     }
+    /* @internal */
     function getUniqueName(baseName, sourceFile) {
         var nameText = baseName;
         for (var i = 1; !ts.isFileLevelUniqueName(sourceFile, nameText); i++) {
@@ -71902,6 +88093,12 @@ var ts;
         return nameText;
     }
     ts.getUniqueName = getUniqueName;
+    /**
+     * @return The index of the (only) reference to the extracted symbol.  We want the cursor
+     * to be on the reference, rather than the declaration, because it's closer to where the
+     * user was before extracting it.
+     */
+    /* @internal */
     function getRenameLocation(edits, renameFilename, name, preferLastLocation) {
         var delta = 0;
         var lastPos = -1;
@@ -71914,6 +88111,7 @@ var ts;
                 var index = indexInTextChange(newText, name);
                 if (index !== -1) {
                     lastPos = span.start + delta + index;
+                    // If the reference comes first, return immediately.
                     if (!preferLastLocation) {
                         return lastPos;
                     }
@@ -71921,6 +88119,7 @@ var ts;
                 delta += newText.length - span.length;
             }
         }
+        // If the declaration comes first, return the position of the last occurrence.
         ts.Debug.assert(preferLastLocation);
         ts.Debug.assert(lastPos >= 0);
         return lastPos;
@@ -71929,6 +88128,7 @@ var ts;
     function indexInTextChange(change, name) {
         if (ts.startsWith(change, name))
             return 0;
+        // Add a " " to avoid references inside words
         var idx = change.indexOf(" " + name);
         if (idx === -1)
             idx = change.indexOf("." + name);
@@ -71940,23 +88140,64 @@ var ts;
 var ts;
 (function (ts) {
     function createClassifier() {
-        var scanner = ts.createScanner(6, false);
+        var scanner = ts.createScanner(6 /* Latest */, /*skipTrivia*/ false);
         function getClassificationsForLine(text, lexState, syntacticClassifierAbsent) {
             return convertClassificationsToResult(getEncodedLexicalClassifications(text, lexState, syntacticClassifierAbsent), text);
         }
+        // If there is a syntactic classifier ('syntacticClassifierAbsent' is false),
+        // we will be more conservative in order to avoid conflicting with the syntactic classifier.
         function getEncodedLexicalClassifications(text, lexState, syntacticClassifierAbsent) {
-            var token = 0;
-            var lastNonTriviaToken = 0;
+            var token = 0 /* Unknown */;
+            var lastNonTriviaToken = 0 /* Unknown */;
+            // Just a stack of TemplateHeads and OpenCurlyBraces, used to perform rudimentary (inexact)
+            // classification on template strings. Because of the context free nature of templates,
+            // the only precise way to classify a template portion would be by propagating the stack across
+            // lines, just as we do with the end-of-line state. However, this is a burden for implementers,
+            // and the behavior is entirely subsumed by the syntactic classifier anyway, so we instead
+            // flatten any nesting when the template stack is non-empty and encode it in the end-of-line state.
+            // Situations in which this fails are
+            //  1) When template strings are nested across different lines:
+            //          `hello ${ `world
+            //          ` }`
+            //
+            //     Where on the second line, you will get the closing of a template,
+            //     a closing curly, and a new template.
+            //
+            //  2) When substitution expressions have curly braces and the curly brace falls on the next line:
+            //          `hello ${ () => {
+            //          return "world" } } `
+            //
+            //     Where on the second line, you will get the 'return' keyword,
+            //     a string literal, and a template end consisting of '} } `'.
             var templateStack = [];
             var _a = getPrefixFromLexState(lexState), prefix = _a.prefix, pushTemplate = _a.pushTemplate;
             text = prefix + text;
             var offset = prefix.length;
             if (pushTemplate) {
-                templateStack.push(14);
+                templateStack.push(14 /* TemplateHead */);
             }
             scanner.setText(text);
-            var endOfLineState = 0;
+            var endOfLineState = 0 /* None */;
             var spans = [];
+            // We can run into an unfortunate interaction between the lexical and syntactic classifier
+            // when the user is typing something generic.  Consider the case where the user types:
+            //
+            //      Foo<number
+            //
+            // From the lexical classifier's perspective, 'number' is a keyword, and so the word will
+            // be classified as such.  However, from the syntactic classifier's tree-based perspective
+            // this is simply an expression with the identifier 'number' on the RHS of the less than
+            // token.  So the classification will go back to being an identifier.  The moment the user
+            // types again, number will become a keyword, then an identifier, etc. etc.
+            //
+            // To try to avoid this problem, we avoid classifying contextual keywords as keywords
+            // when the user is potentially typing something generic.  We just can't do a good enough
+            // job at the lexical level, and so well leave it up to the syntactic classifier to make
+            // the determination.
+            //
+            // In order to determine if the user is potentially typing something generic, we use a
+            // weak heuristic where we track < and > tokens.  It's a weak heuristic, but should
+            // work well enough in practice.
             var angleBracketStack = 0;
             do {
                 token = scanner.scan();
@@ -71972,56 +88213,68 @@ var ts;
                         endOfLineState = end_1;
                     }
                 }
-            } while (token !== 1);
+            } while (token !== 1 /* EndOfFileToken */);
             function handleToken() {
                 switch (token) {
-                    case 41:
-                    case 63:
-                        if (!noRegexTable[lastNonTriviaToken] && scanner.reScanSlashToken() === 12) {
-                            token = 12;
+                    case 41 /* SlashToken */:
+                    case 63 /* SlashEqualsToken */:
+                        if (!noRegexTable[lastNonTriviaToken] && scanner.reScanSlashToken() === 12 /* RegularExpressionLiteral */) {
+                            token = 12 /* RegularExpressionLiteral */;
                         }
                         break;
-                    case 27:
-                        if (lastNonTriviaToken === 71) {
+                    case 27 /* LessThanToken */:
+                        if (lastNonTriviaToken === 71 /* Identifier */) {
+                            // Could be the start of something generic.  Keep track of that by bumping
+                            // up the current count of generic contexts we may be in.
                             angleBracketStack++;
                         }
                         break;
-                    case 29:
+                    case 29 /* GreaterThanToken */:
                         if (angleBracketStack > 0) {
+                            // If we think we're currently in something generic, then mark that that
+                            // generic entity is complete.
                             angleBracketStack--;
                         }
                         break;
-                    case 119:
-                    case 137:
-                    case 134:
-                    case 122:
-                    case 138:
+                    case 119 /* AnyKeyword */:
+                    case 137 /* StringKeyword */:
+                    case 134 /* NumberKeyword */:
+                    case 122 /* BooleanKeyword */:
+                    case 138 /* SymbolKeyword */:
                         if (angleBracketStack > 0 && !syntacticClassifierAbsent) {
-                            token = 71;
+                            // If it looks like we're could be in something generic, don't classify this
+                            // as a keyword.  We may just get overwritten by the syntactic classifier,
+                            // causing a noisy experience for the user.
+                            token = 71 /* Identifier */;
                         }
                         break;
-                    case 14:
+                    case 14 /* TemplateHead */:
                         templateStack.push(token);
                         break;
-                    case 17:
+                    case 17 /* OpenBraceToken */:
+                        // If we don't have anything on the template stack,
+                        // then we aren't trying to keep track of a previously scanned template head.
                         if (templateStack.length > 0) {
                             templateStack.push(token);
                         }
                         break;
-                    case 18:
+                    case 18 /* CloseBraceToken */:
+                        // If we don't have anything on the template stack,
+                        // then we aren't trying to keep track of a previously scanned template head.
                         if (templateStack.length > 0) {
                             var lastTemplateStackToken = ts.lastOrUndefined(templateStack);
-                            if (lastTemplateStackToken === 14) {
+                            if (lastTemplateStackToken === 14 /* TemplateHead */) {
                                 token = scanner.reScanTemplateToken();
-                                if (token === 16) {
+                                // Only pop on a TemplateTail; a TemplateMiddle indicates there is more for us.
+                                if (token === 16 /* TemplateTail */) {
                                     templateStack.pop();
                                 }
                                 else {
-                                    ts.Debug.assertEqual(token, 15, "Should have been a template middle.");
+                                    ts.Debug.assertEqual(token, 15 /* TemplateMiddle */, "Should have been a template middle.");
                                 }
                             }
                             else {
-                                ts.Debug.assertEqual(lastTemplateStackToken, 17, "Should have been an open brace");
+                                ts.Debug.assertEqual(lastTemplateStackToken, 17 /* OpenBraceToken */, "Should have been an open brace");
                                 templateStack.pop();
                             }
                         }
@@ -72030,11 +88283,15 @@ var ts;
                         if (!ts.isKeyword(token)) {
                             break;
                         }
-                        if (lastNonTriviaToken === 23) {
-                            token = 71;
+                        if (lastNonTriviaToken === 23 /* DotToken */) {
+                            token = 71 /* Identifier */;
                         }
                         else if (ts.isKeyword(lastNonTriviaToken) && ts.isKeyword(token) && !canFollow(lastNonTriviaToken, token)) {
-                            token = 71;
+                            // We have two keywords in a row.  Only treat the second as a keyword if
+                            // it's a sequence that could legally occur in the language.  Otherwise
+                            // treat it as an identifier.  This way, if someone writes "private var"
+                            // we recognize that 'var' is actually an identifier here.
+                            token = 71 /* Identifier */;
                         }
                 }
             }
@@ -72043,63 +88300,75 @@ var ts;
         return { getClassificationsForLine: getClassificationsForLine, getEncodedLexicalClassifications: getEncodedLexicalClassifications };
     }
     ts.createClassifier = createClassifier;
+    /// We do not have a full parser support to know when we should parse a regex or not
+    /// If we consider every slash token to be a regex, we could be missing cases like "1/2/3", where
+    /// we have a series of divide operator. this list allows us to be more accurate by ruling out
+    /// locations where a regexp cannot exist.
     var noRegexTable = ts.arrayToNumericMap([
-        71,
-        9,
-        8,
-        12,
-        99,
-        43,
-        44,
-        20,
-        22,
-        18,
-        101,
-        86,
+        71 /* Identifier */,
+        9 /* StringLiteral */,
+        8 /* NumericLiteral */,
+        12 /* RegularExpressionLiteral */,
+        99 /* ThisKeyword */,
+        43 /* PlusPlusToken */,
+        44 /* MinusMinusToken */,
+        20 /* CloseParenToken */,
+        22 /* CloseBracketToken */,
+        18 /* CloseBraceToken */,
+        101 /* TrueKeyword */,
+        86 /* FalseKeyword */,
     ], function (token) { return token; }, function () { return true; });
     function getNewEndOfLineState(scanner, token, lastOnTemplateStack) {
         switch (token) {
-            case 9: {
+            case 9 /* StringLiteral */: {
+                // Check to see if we finished up on a multiline string literal.
                 if (!scanner.isUnterminated())
                     return undefined;
                 var tokenText = scanner.getTokenText();
                 var lastCharIndex = tokenText.length - 1;
                 var numBackslashes = 0;
-                while (tokenText.charCodeAt(lastCharIndex - numBackslashes) === 92) {
+                while (tokenText.charCodeAt(lastCharIndex - numBackslashes) === 92 /* backslash */) {
                     numBackslashes++;
                 }
+                // If we have an odd number of backslashes, then the multiline string is unclosed
                 if ((numBackslashes & 1) === 0)
                     return undefined;
-                return tokenText.charCodeAt(0) === 34 ? 3 : 2;
+                return tokenText.charCodeAt(0) === 34 /* doubleQuote */ ? 3 /* InDoubleQuoteStringLiteral */ : 2 /* InSingleQuoteStringLiteral */;
             }
-            case 3:
-                return scanner.isUnterminated() ? 1 : undefined;
+            case 3 /* MultiLineCommentTrivia */:
+                // Check to see if the multiline comment was unclosed.
+                return scanner.isUnterminated() ? 1 /* InMultiLineCommentTrivia */ : undefined;
             default:
                 if (ts.isTemplateLiteralKind(token)) {
                     if (!scanner.isUnterminated()) {
                         return undefined;
                     }
                     switch (token) {
-                        case 16:
-                            return 5;
-                        case 13:
-                            return 4;
+                        case 16 /* TemplateTail */:
+                            return 5 /* InTemplateMiddleOrTail */;
+                        case 13 /* NoSubstitutionTemplateLiteral */:
+                            return 4 /* InTemplateHeadOrNoSubstitutionTemplate */;
                         default:
                             return ts.Debug.fail("Only 'NoSubstitutionTemplateLiteral's and 'TemplateTail's can be unterminated; got SyntaxKind #" + token);
                     }
                 }
-                return lastOnTemplateStack === 14 ? 6 : undefined;
+                return lastOnTemplateStack === 14 /* TemplateHead */ ? 6 /* InTemplateSubstitutionPosition */ : undefined;
         }
     }
     function pushEncodedClassification(start, end, offset, classification, result) {
-        if (classification === 8) {
+        if (classification === 8 /* whiteSpace */) {
+            // Don't bother with whitespace classifications.  They're not needed.
             return;
         }
         if (start === 0 && offset > 0) {
+            // We're classifying the first token, and this was a case where we prepended text.
+            // We should consider the start of this token to be at the start of the original text.
             start += offset;
         }
         var length = end - start;
         if (length > 0) {
+            // All our tokens are in relation to the augmented text.  Move them back to be
+            // relative to the original text.
             result.push(start - offset, length, classification);
         }
     }
@@ -72109,16 +88378,17 @@ var ts;
         var lastEnd = 0;
         for (var i = 0; i < dense.length; i += 3) {
             var start = dense[i];
-            var length_5 = dense[i + 1];
+            var length_1 = dense[i + 1];
             var type = dense[i + 2];
+            // Make a whitespace entry between the last item and this one.
             if (lastEnd >= 0) {
                 var whitespaceLength_1 = start - lastEnd;
                 if (whitespaceLength_1 > 0) {
                     entries.push({ length: whitespaceLength_1, classification: ts.TokenClass.Whitespace });
                 }
             }
-            entries.push({ length: length_5, classification: convertClassification(type) });
-            lastEnd = start + length_5;
+            entries.push({ length: length_1, classification: convertClassification(type) });
+            lastEnd = start + length_1;
         }
         var whitespaceLength = text.length - lastEnd;
         if (whitespaceLength > 0) {
@@ -72128,56 +88398,64 @@ var ts;
     }
     function convertClassification(type) {
         switch (type) {
-            case 1: return ts.TokenClass.Comment;
-            case 3: return ts.TokenClass.Keyword;
-            case 4: return ts.TokenClass.NumberLiteral;
-            case 5: return ts.TokenClass.Operator;
-            case 6: return ts.TokenClass.StringLiteral;
-            case 8: return ts.TokenClass.Whitespace;
-            case 10: return ts.TokenClass.Punctuation;
-            case 2:
-            case 11:
-            case 12:
-            case 13:
-            case 14:
-            case 15:
-            case 16:
-            case 9:
-            case 17:
+            case 1 /* comment */: return ts.TokenClass.Comment;
+            case 3 /* keyword */: return ts.TokenClass.Keyword;
+            case 4 /* numericLiteral */: return ts.TokenClass.NumberLiteral;
+            case 5 /* operator */: return ts.TokenClass.Operator;
+            case 6 /* stringLiteral */: return ts.TokenClass.StringLiteral;
+            case 8 /* whiteSpace */: return ts.TokenClass.Whitespace;
+            case 10 /* punctuation */: return ts.TokenClass.Punctuation;
+            case 2 /* identifier */:
+            case 11 /* className */:
+            case 12 /* enumName */:
+            case 13 /* interfaceName */:
+            case 14 /* moduleName */:
+            case 15 /* typeParameterName */:
+            case 16 /* typeAliasName */:
+            case 9 /* text */:
+            case 17 /* parameterName */:
                 return ts.TokenClass.Identifier;
             default:
-                return undefined;
+                return undefined; // TODO: GH#18217 Debug.assertNever(type);
         }
     }
+    /** Returns true if 'keyword2' can legally follow 'keyword1' in any language construct. */
     function canFollow(keyword1, keyword2) {
         if (!ts.isAccessibilityModifier(keyword1)) {
+            // Assume any other keyword combination is legal.
+            // This can be refined in the future if there are more cases we want the classifier to be better at.
             return true;
         }
         switch (keyword2) {
-            case 125:
-            case 136:
-            case 123:
-            case 115:
-                return true;
+            case 125 /* GetKeyword */:
+            case 136 /* SetKeyword */:
+            case 123 /* ConstructorKeyword */:
+            case 115 /* StaticKeyword */:
+                return true; // Allow things like "public get", "public constructor" and "public static".
             default:
-                return false;
+                return false; // Any other keyword following "public" is actually an identifier, not a real keyword.
         }
     }
     function getPrefixFromLexState(lexState) {
+        // If we're in a string literal, then prepend: "\
+        // (and a newline).  That way when we lex we'll think we're still in a string literal.
+        //
+        // If we're in a multiline comment, then prepend: /*
+        // (and a newline).  That way when we lex we'll think we're still in a multiline comment.
         switch (lexState) {
-            case 3:
+            case 3 /* InDoubleQuoteStringLiteral */:
                 return { prefix: "\"\\\n" };
-            case 2:
+            case 2 /* InSingleQuoteStringLiteral */:
                 return { prefix: "'\\\n" };
-            case 1:
+            case 1 /* InMultiLineCommentTrivia */:
                 return { prefix: "/*\n" };
-            case 4:
+            case 4 /* InTemplateHeadOrNoSubstitutionTemplate */:
                 return { prefix: "`\n" };
-            case 5:
+            case 5 /* InTemplateMiddleOrTail */:
                 return { prefix: "}\n", pushTemplate: true };
-            case 6:
+            case 6 /* InTemplateSubstitutionPosition */:
                 return { prefix: "", pushTemplate: true };
-            case 0:
+            case 0 /* None */:
                 return { prefix: "" };
             default:
                 return ts.Debug.assertNever(lexState);
@@ -72185,43 +88463,43 @@ var ts;
     }
     function isBinaryExpressionOperatorToken(token) {
         switch (token) {
-            case 39:
-            case 41:
-            case 42:
-            case 37:
-            case 38:
-            case 45:
-            case 46:
-            case 47:
-            case 27:
-            case 29:
-            case 30:
-            case 31:
-            case 93:
-            case 92:
-            case 118:
-            case 32:
-            case 33:
-            case 34:
-            case 35:
-            case 48:
-            case 50:
-            case 49:
-            case 53:
-            case 54:
-            case 69:
-            case 68:
-            case 70:
-            case 65:
-            case 66:
-            case 67:
-            case 59:
-            case 60:
-            case 61:
-            case 63:
-            case 64:
-            case 58:
-            case 26:
+            case 39 /* AsteriskToken */:
+            case 41 /* SlashToken */:
+            case 42 /* PercentToken */:
+            case 37 /* PlusToken */:
+            case 38 /* MinusToken */:
+            case 45 /* LessThanLessThanToken */:
+            case 46 /* GreaterThanGreaterThanToken */:
+            case 47 /* GreaterThanGreaterThanGreaterThanToken */:
+            case 27 /* LessThanToken */:
+            case 29 /* GreaterThanToken */:
+            case 30 /* LessThanEqualsToken */:
+            case 31 /* GreaterThanEqualsToken */:
+            case 93 /* InstanceOfKeyword */:
+            case 92 /* InKeyword */:
+            case 118 /* AsKeyword */:
+            case 32 /* EqualsEqualsToken */:
+            case 33 /* ExclamationEqualsToken */:
+            case 34 /* EqualsEqualsEqualsToken */:
+            case 35 /* ExclamationEqualsEqualsToken */:
+            case 48 /* AmpersandToken */:
+            case 50 /* CaretToken */:
+            case 49 /* BarToken */:
+            case 53 /* AmpersandAmpersandToken */:
+            case 54 /* BarBarToken */:
+            case 69 /* BarEqualsToken */:
+            case 68 /* AmpersandEqualsToken */:
+            case 70 /* CaretEqualsToken */:
+            case 65 /* LessThanLessThanEqualsToken */:
+            case 66 /* GreaterThanGreaterThanEqualsToken */:
+            case 67 /* GreaterThanGreaterThanGreaterThanEqualsToken */:
+            case 59 /* PlusEqualsToken */:
+            case 60 /* MinusEqualsToken */:
+            case 61 /* AsteriskEqualsToken */:
+            case 63 /* SlashEqualsToken */:
+            case 64 /* PercentEqualsToken */:
+            case 58 /* EqualsToken */:
+            case 26 /* CommaToken */:
                 return true;
             default:
                 return false;
@@ -72229,12 +88507,12 @@ var ts;
     }
     function isPrefixUnaryExpressionOperatorToken(token) {
         switch (token) {
-            case 37:
-            case 38:
-            case 52:
-            case 51:
-            case 43:
-            case 44:
+            case 37 /* PlusToken */:
+            case 38 /* MinusToken */:
+            case 52 /* TildeToken */:
+            case 51 /* ExclamationToken */:
+            case 43 /* PlusPlusToken */:
+            case 44 /* MinusMinusToken */:
                 return true;
             default:
                 return false;
@@ -72242,56 +88520,72 @@ var ts;
     }
     function classFromKind(token) {
         if (ts.isKeyword(token)) {
-            return 3;
+            return 3 /* keyword */;
         }
         else if (isBinaryExpressionOperatorToken(token) || isPrefixUnaryExpressionOperatorToken(token)) {
-            return 5;
+            return 5 /* operator */;
         }
-        else if (token >= 17 && token <= 70) {
-            return 10;
+        else if (token >= 17 /* FirstPunctuation */ && token <= 70 /* LastPunctuation */) {
+            return 10 /* punctuation */;
         }
         switch (token) {
-            case 8:
-                return 4;
-            case 9:
-                return 6;
-            case 12:
-                return 7;
-            case 7:
-            case 3:
-            case 2:
-                return 1;
-            case 5:
-            case 4:
-                return 8;
-            case 71:
+            case 8 /* NumericLiteral */:
+                return 4 /* numericLiteral */;
+            case 9 /* StringLiteral */:
+                return 6 /* stringLiteral */;
+            case 12 /* RegularExpressionLiteral */:
+                return 7 /* regularExpressionLiteral */;
+            case 7 /* ConflictMarkerTrivia */:
+            case 3 /* MultiLineCommentTrivia */:
+            case 2 /* SingleLineCommentTrivia */:
+                return 1 /* comment */;
+            case 5 /* WhitespaceTrivia */:
+            case 4 /* NewLineTrivia */:
+                return 8 /* whiteSpace */;
+            case 71 /* Identifier */:
             default:
                 if (ts.isTemplateLiteralKind(token)) {
-                    return 6;
+                    return 6 /* stringLiteral */;
                 }
-                return 2;
+                return 2 /* identifier */;
         }
     }
+    /* @internal */
     function getSemanticClassifications(typeChecker, cancellationToken, sourceFile, classifiableNames, span) {
         return convertClassificationsToSpans(getEncodedSemanticClassifications(typeChecker, cancellationToken, sourceFile, classifiableNames, span));
     }
     ts.getSemanticClassifications = getSemanticClassifications;
     function checkForClassificationCancellation(cancellationToken, kind) {
+        // We don't want to actually call back into our host on every node to find out if we've
+        // been canceled.  That would be an enormous amount of chattyness, along with the all
+        // the overhead of marshalling the data to/from the host.  So instead we pick a few
+        // reasonable node kinds to bother checking on.  These node kinds represent high level
+        // constructs that we would expect to see commonly, but just at a far less frequent
+        // interval.
+        //
+        // For example, in checker.ts (around 750k) we only have around 600 of these constructs.
+        // That means we're calling back into the host around every 1.2k of the file we process.
+        // Lib.d.ts has similar numbers.
         switch (kind) {
-            case 239:
-            case 235:
-            case 236:
-            case 234:
+            case 239 /* ModuleDeclaration */:
+            case 235 /* ClassDeclaration */:
+            case 236 /* InterfaceDeclaration */:
+            case 234 /* FunctionDeclaration */:
                 cancellationToken.throwIfCancellationRequested();
         }
     }
+    /* @internal */
     function getEncodedSemanticClassifications(typeChecker, cancellationToken, sourceFile, classifiableNames, span) {
         var spans = [];
         sourceFile.forEachChild(function cb(node) {
+            // Only walk into nodes that intersect the requested span.
             if (!node || !ts.textSpanIntersectsWith(span, node.pos, node.getFullWidth())) {
                 return;
             }
             checkForClassificationCancellation(cancellationToken, node.kind);
+            // Only bother calling into the typechecker if this is an identifier that
+            // could possibly resolve to a type name.  This makes classification run
+            // in a third of the time it would normally take.
             if (ts.isIdentifier(node) && !ts.nodeIsMissing(node) && classifiableNames.has(node.escapedText)) {
                 var symbol = typeChecker.getSymbolAtLocation(node);
                 var type = symbol && classifySymbol(symbol, ts.getMeaningFromLocation(node), typeChecker);
@@ -72301,7 +88595,7 @@ var ts;
             }
             node.forEachChild(cb);
         });
-        return { spans: spans, endOfLineState: 0 };
+        return { spans: spans, endOfLineState: 0 /* None */ };
         function pushClassification(start, end, type) {
             spans.push(start);
             spans.push(end - start);
@@ -72311,62 +88605,66 @@ var ts;
     ts.getEncodedSemanticClassifications = getEncodedSemanticClassifications;
     function classifySymbol(symbol, meaningAtPosition, checker) {
         var flags = symbol.getFlags();
-        if ((flags & 2885600) === 0) {
+        if ((flags & 2885600 /* Classifiable */) === 0 /* None */) {
             return undefined;
         }
-        else if (flags & 32) {
-            return 11;
+        else if (flags & 32 /* Class */) {
+            return 11 /* className */;
         }
-        else if (flags & 384) {
-            return 12;
+        else if (flags & 384 /* Enum */) {
+            return 12 /* enumName */;
         }
-        else if (flags & 524288) {
-            return 16;
+        else if (flags & 524288 /* TypeAlias */) {
+            return 16 /* typeAliasName */;
         }
-        else if (flags & 1536) {
-            return meaningAtPosition & 4 || meaningAtPosition & 1 && hasValueSideModule(symbol) ? 14 : undefined;
+        else if (flags & 1536 /* Module */) {
+            // Only classify a module as such if
+            //  - It appears in a namespace context.
+            //  - There exists a module declaration which actually impacts the value side.
+            return meaningAtPosition & 4 /* Namespace */ || meaningAtPosition & 1 /* Value */ && hasValueSideModule(symbol) ? 14 /* moduleName */ : undefined;
         }
-        else if (flags & 2097152) {
+        else if (flags & 2097152 /* Alias */) {
             return classifySymbol(checker.getAliasedSymbol(symbol), meaningAtPosition, checker);
         }
-        else if (meaningAtPosition & 2) {
-            return flags & 64 ? 13 : flags & 262144 ? 15 : undefined;
+        else if (meaningAtPosition & 2 /* Type */) {
+            return flags & 64 /* Interface */ ? 13 /* interfaceName */ : flags & 262144 /* TypeParameter */ ? 15 /* typeParameterName */ : undefined;
         }
         else {
             return undefined;
         }
     }
+    /** Returns true if there exists a module that introduces entities on the value side. */
     function hasValueSideModule(symbol) {
         return ts.some(symbol.declarations, function (declaration) {
-            return ts.isModuleDeclaration(declaration) && ts.getModuleInstanceState(declaration) === 1;
+            return ts.isModuleDeclaration(declaration) && ts.getModuleInstanceState(declaration) === 1 /* Instantiated */;
         });
     }
     function getClassificationTypeName(type) {
         switch (type) {
-            case 1: return "comment";
-            case 2: return "identifier";
-            case 3: return "keyword";
-            case 4: return "number";
-            case 5: return "operator";
-            case 6: return "string";
-            case 8: return "whitespace";
-            case 9: return "text";
-            case 10: return "punctuation";
-            case 11: return "class name";
-            case 12: return "enum name";
-            case 13: return "interface name";
-            case 14: return "module name";
-            case 15: return "type parameter name";
-            case 16: return "type alias name";
-            case 17: return "parameter name";
-            case 18: return "doc comment tag name";
-            case 19: return "jsx open tag name";
-            case 20: return "jsx close tag name";
-            case 21: return "jsx self closing tag name";
-            case 22: return "jsx attribute";
-            case 23: return "jsx text";
-            case 24: return "jsx attribute string literal value";
-            default: return undefined;
+            case 1 /* comment */: return "comment" /* comment */;
+            case 2 /* identifier */: return "identifier" /* identifier */;
+            case 3 /* keyword */: return "keyword" /* keyword */;
+            case 4 /* numericLiteral */: return "number" /* numericLiteral */;
+            case 5 /* operator */: return "operator" /* operator */;
+            case 6 /* stringLiteral */: return "string" /* stringLiteral */;
+            case 8 /* whiteSpace */: return "whitespace" /* whiteSpace */;
+            case 9 /* text */: return "text" /* text */;
+            case 10 /* punctuation */: return "punctuation" /* punctuation */;
+            case 11 /* className */: return "class name" /* className */;
+            case 12 /* enumName */: return "enum name" /* enumName */;
+            case 13 /* interfaceName */: return "interface name" /* interfaceName */;
+            case 14 /* moduleName */: return "module name" /* moduleName */;
+            case 15 /* typeParameterName */: return "type parameter name" /* typeParameterName */;
+            case 16 /* typeAliasName */: return "type alias name" /* typeAliasName */;
+            case 17 /* parameterName */: return "parameter name" /* parameterName */;
+            case 18 /* docCommentTagName */: return "doc comment tag name" /* docCommentTagName */;
+            case 19 /* jsxOpenTagName */: return "jsx open tag name" /* jsxOpenTagName */;
+            case 20 /* jsxCloseTagName */: return "jsx close tag name" /* jsxCloseTagName */;
+            case 21 /* jsxSelfClosingTagName */: return "jsx self closing tag name" /* jsxSelfClosingTagName */;
+            case 22 /* jsxAttribute */: return "jsx attribute" /* jsxAttribute */;
+            case 23 /* jsxText */: return "jsx text" /* jsxText */;
+            case 24 /* jsxAttributeStringLiteralValue */: return "jsx attribute string literal value" /* jsxAttributeStringLiteralValue */;
+            default: return undefined; // TODO: GH#18217 throw Debug.assertNever(type);
         }
     }
     function convertClassificationsToSpans(classifications) {
@@ -72381,18 +88679,21 @@ var ts;
         }
         return result;
     }
+    /* @internal */
     function getSyntacticClassifications(cancellationToken, sourceFile, span) {
         return convertClassificationsToSpans(getEncodedSyntacticClassifications(cancellationToken, sourceFile, span));
     }
     ts.getSyntacticClassifications = getSyntacticClassifications;
+    /* @internal */
     function getEncodedSyntacticClassifications(cancellationToken, sourceFile, span) {
         var spanStart = span.start;
         var spanLength = span.length;
-        var triviaScanner = ts.createScanner(6, false, sourceFile.languageVariant, sourceFile.text);
-        var mergeConflictScanner = ts.createScanner(6, false, sourceFile.languageVariant, sourceFile.text);
+        // Make a scanner we can get trivia from.
+        var triviaScanner = ts.createScanner(6 /* Latest */, /*skipTrivia*/ false, sourceFile.languageVariant, sourceFile.text);
+        var mergeConflictScanner = ts.createScanner(6 /* Latest */, /*skipTrivia*/ false, sourceFile.languageVariant, sourceFile.text);
         var result = [];
         processElement(sourceFile);
-        return { spans: result, endOfLineState: 0 };
+        return { spans: result, endOfLineState: 0 /* None */ };
         function pushClassification(start, length, type) {
             result.push(start);
             result.push(length);
@@ -72402,35 +88703,47 @@ var ts;
             triviaScanner.setTextPos(token.pos);
             while (true) {
                 var start = triviaScanner.getTextPos();
+                // only bother scanning if we have something that could be trivia.
                 if (!ts.couldStartTrivia(sourceFile.text, start)) {
                     return start;
                 }
                 var kind = triviaScanner.scan();
                 var end = triviaScanner.getTextPos();
                 var width = end - start;
+                // The moment we get something that isn't trivia, then stop processing.
                 if (!ts.isTrivia(kind)) {
                     return start;
                 }
                 switch (kind) {
-                    case 4:
-                    case 5:
+                    case 4 /* NewLineTrivia */:
+                    case 5 /* WhitespaceTrivia */:
+                        // Don't bother with newlines/whitespace.
                         continue;
-                    case 2:
-                    case 3:
+                    case 2 /* SingleLineCommentTrivia */:
+                    case 3 /* MultiLineCommentTrivia */:
+                        // Only bother with the trivia if it at least intersects the span of interest.
                         classifyComment(token, kind, start, width);
+                        // Classifying a comment might cause us to reuse the trivia scanner
+                        // (because of jsdoc comments).  So after we classify the comment make
+                        // sure we set the scanner position back to where it needs to be.
                         triviaScanner.setTextPos(end);
                         continue;
-                    case 7:
+                    case 7 /* ConflictMarkerTrivia */:
                         var text = sourceFile.text;
                         var ch = text.charCodeAt(start);
-                        if (ch === 60 || ch === 62) {
-                            pushClassification(start, width, 1);
+                        // for the <<<<<<< and >>>>>>> markers, we just add them in as comments
+                        // in the classification stream.
+                        if (ch === 60 /* lessThan */ || ch === 62 /* greaterThan */) {
+                            pushClassification(start, width, 1 /* comment */);
                             continue;
                         }
-                        ts.Debug.assert(ch === 124 || ch === 61);
+                        // for the ||||||| and ======== markers, add a comment for the first line,
+                        // and then lex all subsequent lines up until the end of the conflict marker.
+                        ts.Debug.assert(ch === 124 /* bar */ || ch === 61 /* equals */);
                         classifyDisabledMergeCode(text, start, end);
                         break;
-                    case 6:
+                    case 6 /* ShebangTrivia */:
+                        // TODO: Maybe we should classify these.
                         break;
                     default:
                         ts.Debug.assertNever(kind);
@@ -72438,43 +88751,49 @@ var ts;
             }
         }
         function classifyComment(token, kind, start, width) {
-            if (kind === 3) {
+            if (kind === 3 /* MultiLineCommentTrivia */) {
+                // See if this is a doc comment.  If so, we'll classify certain portions of it
+                // specially.
                 var docCommentAndDiagnostics = ts.parseIsolatedJSDocComment(sourceFile.text, start, width);
                 if (docCommentAndDiagnostics && docCommentAndDiagnostics.jsDoc) {
+                    // TODO: This should be predicated on `token["kind"]` being compatible with `HasJSDoc["kind"]`
                     docCommentAndDiagnostics.jsDoc.parent = token;
                     classifyJSDocComment(docCommentAndDiagnostics.jsDoc);
                     return;
                 }
             }
+            // Simple comment.  Just add as is.
             pushCommentRange(start, width);
         }
         function pushCommentRange(start, width) {
-            pushClassification(start, width, 1);
+            pushClassification(start, width, 1 /* comment */);
         }
         function classifyJSDocComment(docComment) {
             var pos = docComment.pos;
             if (docComment.tags) {
                 for (var _i = 0, _a = docComment.tags; _i < _a.length; _i++) {
                     var tag = _a[_i];
+                    // As we walk through each tag, classify the portion of text from the end of
+                    // the last tag (or the start of the entire doc comment) as 'comment'.
                     if (tag.pos !== pos) {
                         pushCommentRange(pos, tag.pos - pos);
                     }
-                    pushClassification(tag.atToken.pos, tag.atToken.end - tag.atToken.pos, 10);
-                    pushClassification(tag.tagName.pos, tag.tagName.end - tag.tagName.pos, 18);
+                    pushClassification(tag.atToken.pos, tag.atToken.end - tag.atToken.pos, 10 /* punctuation */); // "@"
+                    pushClassification(tag.tagName.pos, tag.tagName.end - tag.tagName.pos, 18 /* docCommentTagName */); // e.g. "param"
                     pos = tag.tagName.end;
                     switch (tag.kind) {
-                        case 293:
+                        case 293 /* JSDocParameterTag */:
                             processJSDocParameterTag(tag);
                             break;
-                        case 296:
+                        case 296 /* JSDocTemplateTag */:
                             processJSDocTemplateTag(tag);
                             pos = tag.end;
                             break;
-                        case 295:
+                        case 295 /* JSDocTypeTag */:
                             processElement(tag.typeExpression);
                             pos = tag.end;
                             break;
-                        case 294:
+                        case 294 /* JSDocReturnTag */:
                             processElement(tag.typeExpression);
                             pos = tag.end;
                             break;
@@ -72488,7 +88807,7 @@ var ts;
             function processJSDocParameterTag(tag) {
                 if (tag.isNameFirst) {
                     pushCommentRange(pos, tag.name.pos - pos);
-                    pushClassification(tag.name.pos, tag.name.end - tag.name.pos, 17);
+                    pushClassification(tag.name.pos, tag.name.end - tag.name.pos, 17 /* parameterName */);
                     pos = tag.name.end;
                 }
                 if (tag.typeExpression) {
@@ -72498,7 +88817,7 @@ var ts;
                 }
                 if (!tag.isNameFirst) {
                     pushCommentRange(pos, tag.name.pos - pos);
-                    pushClassification(tag.name.pos, tag.name.end - tag.name.pos, 17);
+                    pushClassification(tag.name.pos, tag.name.end - tag.name.pos, 17 /* parameterName */);
                     pos = tag.name.end;
                 }
             }
@@ -72510,13 +88829,15 @@ var ts;
             }
         }
         function classifyDisabledMergeCode(text, start, end) {
+            // Classify the line that the ||||||| or ======= marker is on as a comment.
+            // Then just lex all further tokens and add them to the result.
             var i;
             for (i = start; i < end; i++) {
                 if (ts.isLineBreak(text.charCodeAt(i))) {
                     break;
                 }
             }
-            pushClassification(start, i - start, 1);
+            pushClassification(start, i - start, 1 /* comment */);
             mergeConflictScanner.setTextPos(i);
             while (mergeConflictScanner.getTextPos() < end) {
                 classifyDisabledCodeToken();
@@ -72531,6 +88852,10 @@ var ts;
                 pushClassification(start, end - start, type);
             }
         }
+        /**
+         * Returns true if node should be treated as classified and no further processing is required.
+         * False will mean that node is not classified and traverse routine should recurse into node contents.
+         */
         function tryClassifyNode(node) {
             if (ts.isJSDoc(node)) {
                 return true;
@@ -72539,10 +88864,10 @@ var ts;
                 return true;
             }
             var classifiedElementName = tryClassifyJsxElementName(node);
-            if (!ts.isToken(node) && node.kind !== 10 && classifiedElementName === undefined) {
+            if (!ts.isToken(node) && node.kind !== 10 /* JsxText */ && classifiedElementName === undefined) {
                 return false;
             }
-            var tokenStart = node.kind === 10 ? node.pos : classifyLeadingTriviaAndGetTokenStart(node);
+            var tokenStart = node.kind === 10 /* JsxText */ ? node.pos : classifyLeadingTriviaAndGetTokenStart(node);
             var tokenWidth = node.end - tokenStart;
             ts.Debug.assert(tokenWidth >= 0);
             if (tokenWidth > 0) {
@@ -72555,120 +88880,133 @@ var ts;
         }
         function tryClassifyJsxElementName(token) {
             switch (token.parent && token.parent.kind) {
-                case 257:
+                case 257 /* JsxOpeningElement */:
                     if (token.parent.tagName === token) {
-                        return 19;
+                        return 19 /* jsxOpenTagName */;
                     }
                     break;
-                case 258:
+                case 258 /* JsxClosingElement */:
                     if (token.parent.tagName === token) {
-                        return 20;
+                        return 20 /* jsxCloseTagName */;
                     }
                     break;
-                case 256:
+                case 256 /* JsxSelfClosingElement */:
                     if (token.parent.tagName === token) {
-                        return 21;
+                        return 21 /* jsxSelfClosingTagName */;
                     }
                     break;
-                case 262:
+                case 262 /* JsxAttribute */:
                     if (token.parent.name === token) {
-                        return 22;
+                        return 22 /* jsxAttribute */;
                     }
                     break;
             }
             return undefined;
         }
+        // for accurate classification, the actual token should be passed in.  however, for
+        // cases like 'disabled merge code' classification, we just get the token kind and
+        // classify based on that instead.
         function classifyTokenType(tokenKind, token) {
             if (ts.isKeyword(tokenKind)) {
-                return 3;
+                return 3 /* keyword */;
             }
-            if (tokenKind === 27 || tokenKind === 29) {
+            // Special case `<` and `>`: If they appear in a generic context they are punctuation,
+            // not operators.
+            if (tokenKind === 27 /* LessThanToken */ || tokenKind === 29 /* GreaterThanToken */) {
+                // If the node owning the token has a type argument list or type parameter list, then
+                // we can effectively assume that a '<' and '>' belong to those lists.
                 if (token && ts.getTypeArgumentOrTypeParameterList(token.parent)) {
-                    return 10;
+                    return 10 /* punctuation */;
                 }
             }
             if (ts.isPunctuation(tokenKind)) {
                 if (token) {
                     var parent = token.parent;
-                    if (tokenKind === 58) {
-                        if (parent.kind === 232 ||
-                            parent.kind === 152 ||
-                            parent.kind === 149 ||
-                            parent.kind === 262) {
-                            return 5;
+                    if (tokenKind === 58 /* EqualsToken */) {
+                        // the '=' in a variable declaration is special cased here.
+                        if (parent.kind === 232 /* VariableDeclaration */ ||
+                            parent.kind === 152 /* PropertyDeclaration */ ||
+                            parent.kind === 149 /* Parameter */ ||
+                            parent.kind === 262 /* JsxAttribute */) {
+                            return 5 /* operator */;
                         }
                     }
-                    if (parent.kind === 200 ||
-                        parent.kind === 198 ||
-                        parent.kind === 199 ||
-                        parent.kind === 201) {
-                        return 5;
+                    if (parent.kind === 200 /* BinaryExpression */ ||
+                        parent.kind === 198 /* PrefixUnaryExpression */ ||
+                        parent.kind === 199 /* PostfixUnaryExpression */ ||
+                        parent.kind === 201 /* ConditionalExpression */) {
+                        return 5 /* operator */;
                     }
                 }
-                return 10;
+                return 10 /* punctuation */;
             }
-            else if (tokenKind === 8) {
-                return 4;
+            else if (tokenKind === 8 /* NumericLiteral */) {
+                return 4 /* numericLiteral */;
             }
-            else if (tokenKind === 9) {
-                return token.parent.kind === 262 ? 24 : 6;
+            else if (tokenKind === 9 /* StringLiteral */) {
+                // TODO: GH#18217
+                return token.parent.kind === 262 /* JsxAttribute */ ? 24 /* jsxAttributeStringLiteralValue */ : 6 /* stringLiteral */;
             }
-            else if (tokenKind === 12) {
-                return 6;
+            else if (tokenKind === 12 /* RegularExpressionLiteral */) {
+                // TODO: we should get another classification type for these literals.
+                return 6 /* stringLiteral */;
             }
             else if (ts.isTemplateLiteralKind(tokenKind)) {
-                return 6;
+                // TODO (drosen): we should *also* get another classification type for these literals.
+                return 6 /* stringLiteral */;
             }
-            else if (tokenKind === 10) {
-                return 23;
+            else if (tokenKind === 10 /* JsxText */) {
+                return 23 /* jsxText */;
             }
-            else if (tokenKind === 71) {
+            else if (tokenKind === 71 /* Identifier */) {
                 if (token) {
                     switch (token.parent.kind) {
-                        case 235:
+                        case 235 /* ClassDeclaration */:
                             if (token.parent.name === token) {
-                                return 11;
+                                return 11 /* className */;
                             }
                             return;
-                        case 148:
+                        case 148 /* TypeParameter */:
                             if (token.parent.name === token) {
-                                return 15;
+                                return 15 /* typeParameterName */;
                             }
                             return;
-                        case 236:
+                        case 236 /* InterfaceDeclaration */:
                             if (token.parent.name === token) {
-                                return 13;
+                                return 13 /* interfaceName */;
                             }
                             return;
-                        case 238:
+                        case 238 /* EnumDeclaration */:
                             if (token.parent.name === token) {
-                                return 12;
+                                return 12 /* enumName */;
                             }
                             return;
-                        case 239:
+                        case 239 /* ModuleDeclaration */:
                             if (token.parent.name === token) {
-                                return 14;
+                                return 14 /* moduleName */;
                             }
                             return;
-                        case 149:
+                        case 149 /* Parameter */:
                             if (token.parent.name === token) {
-                                return ts.isThisIdentifier(token) ? 3 : 17;
+                                return ts.isThisIdentifier(token) ? 3 /* keyword */ : 17 /* parameterName */;
                             }
                             return;
                     }
                 }
-                return 2;
+                return 2 /* identifier */;
             }
         }
         function processElement(element) {
             if (!element) {
                 return;
             }
+            // Ignore nodes that don't intersect the original span to classify.
             if (ts.decodedTextSpanIntersectsWith(spanStart, spanLength, element.pos, element.getFullWidth())) {
                 checkForClassificationCancellation(cancellationToken, element.kind);
                 for (var _i = 0, _a = element.getChildren(sourceFile); _i < _a.length; _i++) {
                     var child = _a[_i];
                     if (!tryClassifyNode(child)) {
+                        // Recurse into our child nodes.
                         processElement(child);
                     }
                 }
@@ -72677,6 +89015,7 @@ var ts;
     }
     ts.getEncodedSyntacticClassifications = getEncodedSyntacticClassifications;
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var Completions;
@@ -72704,27 +89043,35 @@ var ts;
                 if (isPathRelativeToScript(literalValue) || ts.isRootedDiskPath(literalValue)) {
                     var extensions = getSupportedExtensionsForModuleResolution(compilerOptions);
                     if (compilerOptions.rootDirs) {
-                        return getCompletionEntriesForDirectoryFragmentWithRootDirs(compilerOptions.rootDirs, literalValue, scriptDirectory, extensions, false, compilerOptions, host, scriptPath);
+                        return getCompletionEntriesForDirectoryFragmentWithRootDirs(compilerOptions.rootDirs, literalValue, scriptDirectory, extensions, /*includeExtensions*/ false, compilerOptions, host, scriptPath);
                     }
                     else {
-                        return getCompletionEntriesForDirectoryFragment(literalValue, scriptDirectory, extensions, false, host, scriptPath);
+                        return getCompletionEntriesForDirectoryFragment(literalValue, scriptDirectory, extensions, /*includeExtensions*/ false, host, scriptPath);
                     }
                 }
                 else {
+                    // Check for node modules
                     return getCompletionEntriesForNonRelativeModules(literalValue, scriptDirectory, compilerOptions, host, typeChecker);
                 }
             }
             function getSupportedExtensionsForModuleResolution(compilerOptions) {
                 var extensions = ts.getSupportedExtensions(compilerOptions);
                 return compilerOptions.resolveJsonModule && ts.getEmitModuleResolutionKind(compilerOptions) === ts.ModuleResolutionKind.NodeJs ?
-                    extensions.concat(".json") :
+                    extensions.concat(".json" /* Json */) :
                     extensions;
             }
+            /**
+             * Takes a script path and returns paths for all potential folders that could be merged with its
+             * containing folder via the "rootDirs" compiler option
+             */
             function getBaseDirectoriesFromRootDirs(rootDirs, basePath, scriptPath, ignoreCase) {
+                // Make all paths absolute/normalized if they are not already
                 rootDirs = rootDirs.map(function (rootDirectory) { return ts.normalizePath(ts.isRootedDiskPath(rootDirectory) ? rootDirectory : ts.combinePaths(basePath, rootDirectory)); });
+                // Determine the path to the directory containing the script relative to the root directory it is contained within
                 var relativeDirectory = ts.firstDefined(rootDirs, function (rootDirectory) {
                     return ts.containsPath(rootDirectory, scriptPath, basePath, ignoreCase) ? scriptPath.substr(rootDirectory.length) : undefined;
-                });
+                }); // TODO: GH#18217
+                // Now find a path for each potential directory that is to be merged with the one containing the script
                 return ts.deduplicate(rootDirs.map(function (rootDirectory) { return ts.combinePaths(rootDirectory, relativeDirectory); }), ts.equateStringsCaseSensitive, ts.compareStringsCaseSensitive);
             }
             function getCompletionEntriesForDirectoryFragmentWithRootDirs(rootDirs, fragment, scriptPath, extensions, includeExtensions, compilerOptions, host, exclude) {
@@ -72738,12 +89085,19 @@ var ts;
                 }
                 return result;
             }
+            /**
+             * Given a path ending at a directory, gets the completions for the path, and filters for those entries containing the basename.
+             */
             function getCompletionEntriesForDirectoryFragment(fragment, scriptPath, extensions, includeExtensions, host, exclude, result) {
                 if (result === void 0) { result = []; }
                 if (fragment === undefined) {
                     fragment = "";
                 }
                 fragment = ts.normalizeSlashes(fragment);
+                /**
+                 * Remove the basename from the path. Note that we don't use the basename to filter completions;
+                 * the client is responsible for refining completions.
+                 */
                 if (!ts.hasTrailingDirectorySeparator(fragment)) {
                     fragment = ts.getDirectoryPath(fragment);
                 }
@@ -72751,41 +89105,57 @@ var ts;
                     fragment = "." + ts.directorySeparator;
                 }
                 fragment = ts.ensureTrailingDirectorySeparator(fragment);
+                // const absolutePath = normalizeAndPreserveTrailingSlash(isRootedDiskPath(fragment) ? fragment : combinePaths(scriptPath, fragment)); // TODO(rbuckton): should use resolvePaths
                 var absolutePath = ts.resolvePath(scriptPath, fragment);
                 var baseDirectory = ts.hasTrailingDirectorySeparator(absolutePath) ? absolutePath : ts.getDirectoryPath(absolutePath);
                 var ignoreCase = !(host.useCaseSensitiveFileNames && host.useCaseSensitiveFileNames());
                 if (tryDirectoryExists(host, baseDirectory)) {
-                    var files = tryReadDirectory(host, baseDirectory, extensions, undefined, ["./*"]);
+                    // Enumerate the available files if possible
+                    var files = tryReadDirectory(host, baseDirectory, extensions, /*exclude*/ undefined, /*include*/ ["./*"]);
                     if (files) {
+                        /**
+                         * Multiple file entries might map to the same truncated name once we remove extensions
+                         * (happens iff includeExtensions === false)so we use a set-like data structure. Eg:
+                         *
+                         * both foo.ts and foo.tsx become foo
+                         */
                         var foundFiles = ts.createMap();
-                        for (var _i = 0, files_3 = files; _i < files_3.length; _i++) {
-                            var filePath = files_3[_i];
+                        for (var _i = 0, files_1 = files; _i < files_1.length; _i++) {
+                            var filePath = files_1[_i];
                             filePath = ts.normalizePath(filePath);
-                            if (exclude && ts.comparePaths(filePath, exclude, scriptPath, ignoreCase) === 0) {
+                            if (exclude && ts.comparePaths(filePath, exclude, scriptPath, ignoreCase) === 0 /* EqualTo */) {
                                 continue;
                             }
-                            var foundFileName = includeExtensions || ts.fileExtensionIs(filePath, ".json") ? ts.getBaseFileName(filePath) : ts.removeFileExtension(ts.getBaseFileName(filePath));
+                            var foundFileName = includeExtensions || ts.fileExtensionIs(filePath, ".json" /* Json */) ? ts.getBaseFileName(filePath) : ts.removeFileExtension(ts.getBaseFileName(filePath));
                             if (!foundFiles.has(foundFileName)) {
                                 foundFiles.set(foundFileName, true);
                             }
                         }
                         ts.forEachKey(foundFiles, function (foundFile) {
-                            result.push(nameAndKind(foundFile, "script"));
+                            result.push(nameAndKind(foundFile, "script" /* scriptElement */));
                         });
                     }
+                    // If possible, get folder completion as well
                     var directories = tryGetDirectories(host, baseDirectory);
                     if (directories) {
                         for (var _a = 0, directories_1 = directories; _a < directories_1.length; _a++) {
                             var directory = directories_1[_a];
                             var directoryName = ts.getBaseFileName(ts.normalizePath(directory));
                             if (directoryName !== "@types") {
-                                result.push(nameAndKind(directoryName, "directory"));
+                                result.push(nameAndKind(directoryName, "directory" /* directory */));
                             }
                         }
                     }
                 }
                 return result;
             }
+            /**
+             * Check all of the declared modules and those in node modules. Possible sources of modules:
+             *      Modules that are found by the type checker
+             *      Modules found relative to "baseUrl" compliler options (including patterns from "paths" compiler option)
+             *      Modules from node_modules (i.e. those listed in package.json)
+             *          This includes all files that are found in node_modules/moduleName/ with acceptable file extensions
+             */
             function getCompletionEntriesForNonRelativeModules(fragment, scriptPath, compilerOptions, host, typeChecker) {
                 var baseUrl = compilerOptions.baseUrl, paths = compilerOptions.paths;
                 var result = [];
@@ -72793,18 +89163,19 @@ var ts;
                 if (baseUrl) {
                     var projectDir = compilerOptions.project || host.getCurrentDirectory();
                     var absolute = ts.isRootedDiskPath(baseUrl) ? baseUrl : ts.combinePaths(projectDir, baseUrl);
-                    getCompletionEntriesForDirectoryFragment(fragment, ts.normalizePath(absolute), fileExtensions, false, host, undefined, result);
+                    getCompletionEntriesForDirectoryFragment(fragment, ts.normalizePath(absolute), fileExtensions, /*includeExtensions*/ false, host, /*exclude*/ undefined, result);
                     for (var path in paths) {
                         var patterns = paths[path];
                         if (paths.hasOwnProperty(path) && patterns) {
-                            var _loop_12 = function (name, kind) {
+                            var _loop_1 = function (name, kind) {
+                                // Path mappings may provide a duplicate way to get to something we've already added, so don't add again.
                                 if (!result.some(function (entry) { return entry.name === name; })) {
                                     result.push(nameAndKind(name, kind));
                                 }
                             };
                             for (var _i = 0, _a = getCompletionsForPathMapping(path, patterns, fragment, baseUrl, fileExtensions, host); _i < _a.length; _i++) {
                                 var _b = _a[_i], name = _b.name, kind = _b.kind;
-                                _loop_12(name, kind);
+                                _loop_1(name, kind);
                             }
                         }
                     }
@@ -72812,28 +89183,30 @@ var ts;
                 var fragmentDirectory = containsSlash(fragment) ? ts.hasTrailingDirectorySeparator(fragment) ? fragment : ts.getDirectoryPath(fragment) : undefined;
                 for (var _c = 0, _d = getAmbientModuleCompletions(fragment, fragmentDirectory, typeChecker); _c < _d.length; _c++) {
                     var ambientName = _d[_c];
-                    result.push(nameAndKind(ambientName, "external module name"));
+                    result.push(nameAndKind(ambientName, "external module name" /* externalModuleName */));
                 }
                 getCompletionEntriesFromTypings(host, compilerOptions, scriptPath, result);
                 if (ts.getEmitModuleResolutionKind(compilerOptions) === ts.ModuleResolutionKind.NodeJs) {
+                    // If looking for a global package name, don't just include everything in `node_modules` because that includes dependencies' own dependencies.
+                    // (But do if we didn't find anything, e.g. 'package.json' missing.)
                     var foundGlobal = false;
                     if (fragmentDirectory === undefined) {
-                        var _loop_13 = function (moduleName) {
+                        var _loop_2 = function (moduleName) {
                             if (!result.some(function (entry) { return entry.name === moduleName; })) {
                                 foundGlobal = true;
-                                result.push(nameAndKind(moduleName, "external module name"));
+                                result.push(nameAndKind(moduleName, "external module name" /* externalModuleName */));
                             }
                         };
                         for (var _e = 0, _f = enumerateNodeModulesVisibleToScript(host, scriptPath); _e < _f.length; _e++) {
                             var moduleName = _f[_e];
-                            _loop_13(moduleName);
+                            _loop_2(moduleName);
                         }
                     }
                     if (!foundGlobal) {
                         ts.forEachAncestorDirectory(scriptPath, function (ancestor) {
                             var nodeModules = ts.combinePaths(ancestor, "node_modules");
                             if (tryDirectoryExists(host, nodeModules)) {
-                                getCompletionEntriesForDirectoryFragment(fragment, nodeModules, fileExtensions, false, host, undefined, result);
+                                getCompletionEntriesForDirectoryFragment(fragment, nodeModules, fileExtensions, /*includeExtensions*/ false, host, /*exclude*/ undefined, result);
                             }
                         });
                     }
@@ -72842,11 +89215,12 @@ var ts;
             }
             function getCompletionsForPathMapping(path, patterns, fragment, baseUrl, fileExtensions, host) {
                 if (!ts.endsWith(path, "*")) {
-                    return !ts.stringContains(path, "*") && ts.startsWith(path, fragment) ? [{ name: path, kind: "directory" }] : ts.emptyArray;
+                    // For a path mapping "foo": ["/x/y/z.ts"], add "foo" itself as a completion.
+                    return !ts.stringContains(path, "*") && ts.startsWith(path, fragment) ? [{ name: path, kind: "directory" /* directory */ }] : ts.emptyArray;
                 }
                 var pathPrefix = path.slice(0, path.length - 1);
                 if (!ts.startsWith(fragment, pathPrefix)) {
-                    return [{ name: pathPrefix, kind: "directory" }];
+                    return [{ name: pathPrefix, kind: "directory" /* directory */ }];
                 }
                 var remainingFragment = fragment.slice(pathPrefix.length);
                 return ts.flatMap(patterns, function (pattern) { return getModulesForPathsPattern(remainingFragment, baseUrl, pattern, fileExtensions, host); });
@@ -72859,18 +89233,26 @@ var ts;
                 if (!parsed) {
                     return undefined;
                 }
+                // The prefix has two effective parts: the directory path and the base component after the filepath that is not a
+                // full directory component. For example: directory/path/of/prefix/base*
                 var normalizedPrefix = ts.resolvePath(parsed.prefix);
                 var normalizedPrefixDirectory = ts.hasTrailingDirectorySeparator(parsed.prefix) ? normalizedPrefix : ts.getDirectoryPath(normalizedPrefix);
                 var normalizedPrefixBase = ts.hasTrailingDirectorySeparator(parsed.prefix) ? "" : ts.getBaseFileName(normalizedPrefix);
                 var fragmentHasPath = containsSlash(fragment);
                 var fragmentDirectory = fragmentHasPath ? ts.hasTrailingDirectorySeparator(fragment) ? fragment : ts.getDirectoryPath(fragment) : undefined;
+                // Try and expand the prefix to include any path from the fragment so that we can limit the readDirectory call
                 var expandedPrefixDirectory = fragmentHasPath ? ts.combinePaths(normalizedPrefixDirectory, normalizedPrefixBase + fragmentDirectory) : normalizedPrefixDirectory;
                 var normalizedSuffix = ts.normalizePath(parsed.suffix);
+                // Need to normalize after combining: If we combinePaths("a", "../b"), we want "b" and not "a/../b".
                 var baseDirectory = ts.normalizePath(ts.combinePaths(baseUrl, expandedPrefixDirectory));
                 var completePrefix = fragmentHasPath ? baseDirectory : ts.ensureTrailingDirectorySeparator(baseDirectory) + normalizedPrefixBase;
+                // If we have a suffix, then we need to read the directory all the way down. We could create a glob
+                // that encodes the suffix, but we would have to escape the character "?" which readDirectory
+                // doesn't support. For now, this is safer but slower
                 var includeGlob = normalizedSuffix ? "**/*" : "./*";
-                var matches = tryReadDirectory(host, baseDirectory, fileExtensions, undefined, [includeGlob]).map(function (name) { return ({ name: name, kind: "script" }); });
-                var directories = tryGetDirectories(host, baseDirectory).map(function (d) { return ts.combinePaths(baseDirectory, d); }).map(function (name) { return ({ name: name, kind: "directory" }); });
+                var matches = tryReadDirectory(host, baseDirectory, fileExtensions, /*exclude*/ undefined, [includeGlob]).map(function (name) { return ({ name: name, kind: "script" /* scriptElement */ }); });
+                var directories = tryGetDirectories(host, baseDirectory).map(function (d) { return ts.combinePaths(baseDirectory, d); }).map(function (name) { return ({ name: name, kind: "directory" /* directory */ }); });
+                // Trim away prefix and suffix
                 return ts.mapDefined(ts.concatenate(matches, directories), function (_a) {
                     var name = _a.name, kind = _a.kind;
                     var normalizedMatch = ts.normalizePath(name);
@@ -72885,8 +89267,12 @@ var ts;
                 return path[0] === ts.directorySeparator ? path.slice(1) : path;
             }
             function getAmbientModuleCompletions(fragment, fragmentDirectory, checker) {
+                // Get modules that the type checker picked up
                 var ambientModules = checker.getAmbientModules().map(function (sym) { return ts.stripQuotes(sym.name); });
                 var nonRelativeModuleNames = ambientModules.filter(function (moduleName) { return ts.startsWith(moduleName, fragment); });
+                // Nested modules of the form "module-name/sub" need to be adjusted to only return the string
+                // after the last '/' that appears in the fragment because that's where the replacement span
+                // starts
                 if (fragmentDirectory !== undefined) {
                     var moduleNameWithSeparator_1 = ts.ensureTrailingDirectorySeparator(fragmentDirectory);
                     return nonRelativeModuleNames.map(function (nonRelativeModuleName) { return ts.removePrefix(nonRelativeModuleName, moduleNameWithSeparator_1); });
@@ -72894,7 +89280,7 @@ var ts;
                 return nonRelativeModuleNames;
             }
             function getTripleSlashReferenceCompletion(sourceFile, position, compilerOptions, host) {
-                var token = ts.getTokenAtPosition(sourceFile, position, false);
+                var token = ts.getTokenAtPosition(sourceFile, position, /*includeJsDocComment*/ false);
                 var commentRanges = ts.getLeadingCommentRanges(sourceFile.text, token.pos);
                 var range = commentRanges && ts.find(commentRanges, function (commentRange) { return position >= commentRange.pos && position <= commentRange.end; });
                 if (!range) {
@@ -72907,7 +89293,7 @@ var ts;
                 }
                 var prefix = match[1], kind = match[2], toComplete = match[3];
                 var scriptPath = ts.getDirectoryPath(sourceFile.path);
-                var names = kind === "path" ? getCompletionEntriesForDirectoryFragment(toComplete, scriptPath, ts.getSupportedExtensions(compilerOptions), true, host, sourceFile.path)
+                var names = kind === "path" ? getCompletionEntriesForDirectoryFragment(toComplete, scriptPath, ts.getSupportedExtensions(compilerOptions), /*includeExtensions*/ true, host, sourceFile.path)
                     : kind === "types" ? getCompletionEntriesFromTypings(host, compilerOptions, scriptPath)
                         : undefined;
                 return names && addReplacementSpans(toComplete, range.pos + prefix.length, names);
@@ -72915,6 +89301,7 @@ var ts;
             PathCompletions.getTripleSlashReferenceCompletion = getTripleSlashReferenceCompletion;
             function getCompletionEntriesFromTypings(host, options, scriptPath, result) {
                 if (result === void 0) { result = []; }
+                // Check for typings specified in compiler options
                 var seen = ts.createMap();
                 if (options.types) {
                     for (var _i = 0, _a = options.types; _i < _a.length; _i++) {
@@ -72928,13 +89315,14 @@ var ts;
                     try {
                         typeRoots = ts.getEffectiveTypeRoots(options, host);
                     }
-                    catch (_b) { }
+                    catch ( /* Wrap in try catch because getEffectiveTypeRoots touches the filesystem */_b) { /* Wrap in try catch because getEffectiveTypeRoots touches the filesystem */ }
                     if (typeRoots) {
-                        for (var _c = 0, typeRoots_2 = typeRoots; _c < typeRoots_2.length; _c++) {
-                            var root = typeRoots_2[_c];
+                        for (var _c = 0, typeRoots_1 = typeRoots; _c < typeRoots_1.length; _c++) {
+                            var root = typeRoots_1[_c];
                             getCompletionEntriesFromDirectories(root);
                         }
                     }
+                    // Also get all @types typings installed in visible node_modules directories
                     for (var _d = 0, _e = findPackageJsons(scriptPath, host); _d < _e.length; _d++) {
                         var packageJson = _e[_d];
                         var typesDir = ts.combinePaths(ts.getDirectoryPath(packageJson), "node_modules/@types");
@@ -72959,7 +89347,7 @@ var ts;
                 }
                 function pushResult(moduleName) {
                     if (!seen.has(moduleName)) {
-                        result.push(nameAndKind(moduleName, "external module name"));
+                        result.push(nameAndKind(moduleName, "external module name" /* externalModuleName */));
                         seen.set(moduleName, true);
                     }
                 }
@@ -72969,7 +89357,7 @@ var ts;
                 ts.forEachAncestorDirectory(directory, function (ancestor) {
                     var currentConfigPath = ts.findConfigFile(ancestor, function (f) { return tryFileExists(host, f); }, "package.json");
                     if (!currentConfigPath) {
-                        return true;
+                        return true; // break out
                     }
                     paths.push(currentConfigPath);
                 });
@@ -72981,7 +89369,8 @@ var ts;
                 var result = [];
                 for (var _i = 0, _a = findPackageJsons(scriptPath, host); _i < _a.length; _i++) {
                     var packageJson = _a[_i];
-                    var contents = ts.readJson(packageJson, host);
+                    var contents = ts.readJson(packageJson, host); // Cast to assert that readFile is defined
+                    // Provide completions for all non @types dependencies
                     for (var _b = 0, nodeModulesDependencyKeys_1 = nodeModulesDependencyKeys; _b < nodeModulesDependencyKeys_1.length; _b++) {
                         var key = nodeModulesDependencyKeys_1[_b];
                         var dependencies = contents[key];
@@ -72996,20 +89385,35 @@ var ts;
                 }
                 return result;
             }
+            // Replace everything after the last directory separator that appears
             function getDirectoryFragmentTextSpan(text, textStart) {
                 var index = Math.max(text.lastIndexOf(ts.directorySeparator), text.lastIndexOf("\\"));
                 var offset = index !== -1 ? index + 1 : 0;
+                // If the range is an identifier, span is unnecessary.
                 var length = text.length - offset;
-                return length === 0 || ts.isIdentifierText(text.substr(offset, length), 6) ? undefined : ts.createTextSpan(textStart + offset, length);
+                return length === 0 || ts.isIdentifierText(text.substr(offset, length), 6 /* ESNext */) ? undefined : ts.createTextSpan(textStart + offset, length);
             }
+            // Returns true if the path is explicitly relative to the script (i.e. relative to . or ..)
             function isPathRelativeToScript(path) {
-                if (path && path.length >= 2 && path.charCodeAt(0) === 46) {
-                    var slashIndex = path.length >= 3 && path.charCodeAt(1) === 46 ? 2 : 1;
+                if (path && path.length >= 2 && path.charCodeAt(0) === 46 /* dot */) {
+                    var slashIndex = path.length >= 3 && path.charCodeAt(1) === 46 /* dot */ ? 2 : 1;
                     var slashCharCode = path.charCodeAt(slashIndex);
-                    return slashCharCode === 47 || slashCharCode === 92;
+                    return slashCharCode === 47 /* slash */ || slashCharCode === 92 /* backslash */;
                 }
                 return false;
             }
+            /**
+             * Matches a triple slash reference directive with an incomplete string literal for its path. Used
+             * to determine if the caret is currently within the string literal and capture the literal fragment
+             * for completions.
+             * For example, this matches
+             *
+             * /// <reference path="fragment
+             *
+             * but not
+             *
+             * /// <reference path="fragment"
+             */
             var tripleSlashDirectiveFragmentRegex = /^(\/\/\/\s*<reference\s+(path|types)\s*=\s*(?:'|"))([^\3"]*)$/;
             var nodeModulesDependencyKeys = ["dependencies", "devDependencies", "peerDependencies", "optionalDependencies"];
             function tryGetDirectories(host, directoryName) {
@@ -73025,7 +89429,7 @@ var ts;
                 try {
                     return ts.directoryProbablyExists(path, host);
                 }
-                catch (_a) { }
+                catch ( /*ignore*/_a) { /*ignore*/ }
                 return false;
             }
             function tryIOAndConsumeErrors(host, toApply) {
@@ -73036,7 +89440,7 @@ var ts;
                 try {
                     return toApply && toApply.apply(host, args);
                 }
-                catch (_a) { }
+                catch ( /*ignore*/_a) { /*ignore*/ }
                 return undefined;
             }
             function containsSlash(fragment) {
@@ -73045,6 +89449,7 @@ var ts;
         })(PathCompletions = Completions.PathCompletions || (Completions.PathCompletions = {}));
     })(Completions = ts.Completions || (ts.Completions = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var Completions;
@@ -73073,28 +89478,30 @@ var ts;
             }
             var contextToken = ts.findPrecedingToken(position, sourceFile);
             if (triggerCharacter && !isValidTrigger(sourceFile, triggerCharacter, contextToken, position))
-                return undefined;
+                return undefined; // TODO: GH#18217
             if (ts.isInString(sourceFile, position, contextToken)) {
                 return !contextToken || !ts.isStringLiteralLike(contextToken)
                     ? undefined
                     : convertStringLiteralCompletions(getStringLiteralCompletionEntries(sourceFile, contextToken, position, typeChecker, compilerOptions, host), sourceFile, typeChecker, log, preferences);
             }
             if (contextToken && ts.isBreakOrContinueStatement(contextToken.parent)
-                && (contextToken.kind === 72 || contextToken.kind === 77 || contextToken.kind === 71)) {
+                && (contextToken.kind === 72 /* BreakKeyword */ || contextToken.kind === 77 /* ContinueKeyword */ || contextToken.kind === 71 /* Identifier */)) {
                 return getLabelCompletionAtPosition(contextToken.parent);
             }
-            var completionData = getCompletionData(program, log, sourceFile, isUncheckedFile(sourceFile, compilerOptions), position, preferences, undefined);
+            var completionData = getCompletionData(program, log, sourceFile, isUncheckedFile(sourceFile, compilerOptions), position, preferences, /*detailsEntryId*/ undefined);
             if (!completionData) {
                 return undefined;
             }
             switch (completionData.kind) {
-                case 0:
+                case 0 /* Data */:
                     return completionInfoFromData(sourceFile, typeChecker, compilerOptions, log, completionData, preferences);
-                case 1:
+                case 1 /* JsDocTagName */:
+                    // If the current position is a jsDoc tag name, only tag names should be provided for completion
                     return jsdocCompletionInfo(ts.JsDoc.getJSDocTagNameCompletions());
-                case 2:
+                case 2 /* JsDocTag */:
+                    // If the current position is a jsDoc tag, only tags should be provided for completion
                     return jsdocCompletionInfo(ts.JsDoc.getJSDocTagCompletions());
-                case 3:
+                case 3 /* JsDocParameterName */:
                     return jsdocCompletionInfo(ts.JsDoc.getJSDocParameterNameCompletions(completionData.tag));
                 default:
                     return ts.Debug.assertNever(completionData);
@@ -73106,15 +89513,15 @@ var ts;
                 return undefined;
             }
             switch (completion.kind) {
-                case 0:
+                case 0 /* Paths */:
                     return convertPathCompletions(completion.paths);
-                case 1: {
+                case 1 /* Properties */: {
                     var entries = [];
-                    getCompletionEntriesFromSymbols(completion.symbols, entries, sourceFile, sourceFile, checker, 6, log, 4, preferences);
+                    getCompletionEntriesFromSymbols(completion.symbols, entries, sourceFile, sourceFile, checker, 6 /* ESNext */, log, 4 /* String */, preferences); // Target will not be used, so arbitrary
                     return { isGlobalCompletion: false, isMemberCompletion: true, isNewIdentifierLocation: completion.hasIndexSignature, entries: entries };
                 }
-                case 2: {
-                    var entries = completion.types.map(function (type) { return ({ name: type.value, kindModifiers: "", kind: "string", sortText: "0" }); });
+                case 2 /* Types */: {
+                    var entries = completion.types.map(function (type) { return ({ name: type.value, kindModifiers: "" /* none */, kind: "string" /* string */, sortText: "0" }); });
                     return { isGlobalCompletion: false, isMemberCompletion: false, isNewIdentifierLocation: completion.isNewIdentifier, entries: entries };
                 }
                 default:
@@ -73122,11 +89529,11 @@ var ts;
             }
         }
         function convertPathCompletions(pathCompletions) {
-            var isGlobalCompletion = false;
-            var isNewIdentifierLocation = true;
+            var isGlobalCompletion = false; // We don't want the editor to offer any other completions, such as snippets, inside a comment.
+            var isNewIdentifierLocation = true; // The user may type in a path that doesn't yet exist, creating a "new identifier" with respect to the collection of identifiers the server is aware of.
             var entries = pathCompletions.map(function (_a) {
                 var name = _a.name, kind = _a.kind, span = _a.span;
-                return ({ name: name, kind: kind, kindModifiers: "", sortText: "0", replacementSpan: span });
+                return ({ name: name, kind: kind, kindModifiers: "" /* none */, sortText: "0", replacementSpan: span });
             });
             return { isGlobalCompletion: isGlobalCompletion, isMemberCompletion: false, isNewIdentifierLocation: isNewIdentifierLocation, entries: entries };
         }
@@ -73134,13 +89541,18 @@ var ts;
             return { isGlobalCompletion: false, isMemberCompletion: false, isNewIdentifierLocation: false, entries: entries };
         }
         function completionInfoFromData(sourceFile, typeChecker, compilerOptions, log, completionData, preferences) {
-            var symbols = completionData.symbols, completionKind = completionData.completionKind, isInSnippetScope = completionData.isInSnippetScope, isNewIdentifierLocation = completionData.isNewIdentifierLocation, location = completionData.location, propertyAccessToConvert = completionData.propertyAccessToConvert, keywordFilters = completionData.keywordFilters, symbolToOriginInfoMap = completionData.symbolToOriginInfoMap, recommendedCompletion = completionData.recommendedCompletion, isJsxInitializer = completionData.isJsxInitializer;
-            if (sourceFile.languageVariant === 1 && location && location.parent && ts.isJsxClosingElement(location.parent)) {
+            var symbols = completionData.symbols, completionKind = completionData.completionKind, isInSnippetScope = completionData.isInSnippetScope, isNewIdentifierLocation = completionData.isNewIdentifierLocation, location = completionData.location, propertyAccessToConvert = completionData.propertyAccessToConvert, keywordFilters = completionData.keywordFilters, literals = completionData.literals, symbolToOriginInfoMap = completionData.symbolToOriginInfoMap, recommendedCompletion = completionData.recommendedCompletion, isJsxInitializer = completionData.isJsxInitializer;
+            if (sourceFile.languageVariant === 1 /* JSX */ && location && location.parent && ts.isJsxClosingElement(location.parent)) {
+                // In the TypeScript JSX element, if such element is not defined. When users query for completion at closing tag,
+                // instead of simply giving unknown value, the completion will return the tag-name of an associated opening-element.
+                // For example:
+                //     var x = <div> </ /*1*/>
+                // The completion list at "1" will contain "div" with type any
                 var tagName = location.parent.parent.openingElement.tagName;
                 return { isGlobalCompletion: false, isMemberCompletion: true, isNewIdentifierLocation: false,
                     entries: [{
                             name: tagName.getFullText(),
-                            kind: "class",
+                            kind: "class" /* classElement */,
                             kindModifiers: undefined,
                             sortText: "0",
                         }] };
@@ -73148,18 +89560,26 @@ var ts;
             var entries = [];
             if (isUncheckedFile(sourceFile, compilerOptions)) {
                 var uniqueNames = getCompletionEntriesFromSymbols(symbols, entries, location, sourceFile, typeChecker, compilerOptions.target, log, completionKind, preferences, propertyAccessToConvert, isJsxInitializer, recommendedCompletion, symbolToOriginInfoMap);
-                getJavaScriptCompletionEntries(sourceFile, location.pos, uniqueNames, compilerOptions.target, entries);
+                getJavaScriptCompletionEntries(sourceFile, location.pos, uniqueNames, compilerOptions.target, entries); // TODO: GH#18217
             }
             else {
-                if ((!symbols || symbols.length === 0) && keywordFilters === 0) {
+                if ((!symbols || symbols.length === 0) && keywordFilters === 0 /* None */) {
                     return undefined;
                 }
                 getCompletionEntriesFromSymbols(symbols, entries, location, sourceFile, typeChecker, compilerOptions.target, log, completionKind, preferences, propertyAccessToConvert, isJsxInitializer, recommendedCompletion, symbolToOriginInfoMap);
             }
+            // TODO add filter for keyword based on type/value/namespace and also location
+            // Add all keywords if
+            // - this is not a member completion list (all the keywords)
+            // - other filters are enabled in required scenario so add those keywords
             var isMemberCompletion = isMemberCompletionKind(completionKind);
-            if (keywordFilters !== 0 || !isMemberCompletion) {
+            if (keywordFilters !== 0 /* None */ || !isMemberCompletion) {
                 ts.addRange(entries, getKeywordCompletions(keywordFilters));
             }
+            for (var _i = 0, literals_1 = literals; _i < literals_1.length; _i++) {
+                var literal = literals_1[_i];
+                entries.push(createCompletionEntryForLiteral(literal));
+            }
             return { isGlobalCompletion: isInSnippetScope, isMemberCompletion: isMemberCompletion, isNewIdentifierLocation: isNewIdentifierLocation, entries: entries };
         }
         function isUncheckedFile(sourceFile, compilerOptions) {
@@ -73167,9 +89587,9 @@ var ts;
         }
         function isMemberCompletionKind(kind) {
             switch (kind) {
-                case 0:
-                case 3:
-                case 2:
+                case 0 /* ObjectPropertyDeclaration */:
+                case 3 /* MemberLike */:
+                case 2 /* PropertyAccess */:
                     return true;
                 default:
                     return false;
@@ -73177,6 +89597,7 @@ var ts;
         }
         function getJavaScriptCompletionEntries(sourceFile, position, uniqueNames, target, entries) {
             ts.getNameTable(sourceFile).forEach(function (pos, name) {
+                // Skip identifiers produced only from the current location
                 if (pos === position) {
                     return;
                 }
@@ -73184,13 +89605,17 @@ var ts;
                 if (ts.addToSeen(uniqueNames, realName) && ts.isIdentifierText(realName, target) && !ts.isStringANonContextualKeyword(realName)) {
                     entries.push({
                         name: realName,
-                        kind: "warning",
+                        kind: "warning" /* warning */,
                         kindModifiers: "",
                         sortText: "1"
                     });
                 }
             });
         }
+        var completionNameForLiteral = JSON.stringify;
+        function createCompletionEntryForLiteral(literal) {
+            return { name: completionNameForLiteral(literal), kind: "string" /* string */, kindModifiers: "" /* none */, sortText: "0" };
+        }
         function createCompletionEntry(symbol, location, sourceFile, typeChecker, target, kind, origin, recommendedCompletion, propertyAccessToConvert, isJsxInitializer, preferences) {
             var info = getCompletionEntryDisplayNameForSymbol(symbol, target, origin, kind);
             if (!info) {
@@ -73202,9 +89627,12 @@ var ts;
             if (origin && origin.type === "this-type") {
                 insertText = needsConvertPropertyAccess ? "this[" + quote(name, preferences) + "]" : "this." + name;
             }
+            // We should only have needsConvertPropertyAccess if there's a property access to convert. But see #21790.
+            // Somehow there was a global with a non-identifier name. Hopefully someone will complain about getting a "foo bar" global completion and provide a repro.
             else if ((origin && origin.type === "symbol-member" || needsConvertPropertyAccess) && propertyAccessToConvert) {
                 insertText = needsConvertPropertyAccess ? "[" + quote(name, preferences) + "]" : "[" + name + "]";
-                var dot = ts.findChildOfKind(propertyAccessToConvert, 23, sourceFile);
+                var dot = ts.findChildOfKind(propertyAccessToConvert, 23 /* DotToken */, sourceFile);
+                // If the text after the '.' starts with this name, write over it. Else, add new text.
                 var end = ts.startsWith(name, propertyAccessToConvert.name.text) ? propertyAccessToConvert.name.end : dot.end;
                 replacementSpan = ts.createTextSpanFromBounds(dot.getStart(sourceFile), end);
             }
@@ -73219,6 +89647,13 @@ var ts;
             if (insertText !== undefined && !preferences.includeCompletionsWithInsertText) {
                 return undefined;
             }
+            // TODO(drosen): Right now we just permit *all* semantic meanings when calling
+            // 'getSymbolKind' which is permissible given that it is backwards compatible; but
+            // really we should consider passing the meaning for the node so that we don't report
+            // that a suggestion for a value is an interface.  We COULD also just do what
+            // 'getSymbolModifiers' does, which is to use the first declaration.
+            // Use a 'sortText' of 0' so that all symbol completion entries come before any other
+            // entries (like JavaScript identifier entries).
             return {
                 name: name,
                 kind: ts.SymbolDisplay.getSymbolKind(typeChecker, symbol, location),
@@ -73245,7 +89680,7 @@ var ts;
         }
         function isRecommendedCompletionMatch(localSymbol, recommendedCompletion, checker) {
             return localSymbol === recommendedCompletion ||
-                !!(localSymbol.flags & 1048576) && checker.getExportSymbolOfSymbol(localSymbol) === recommendedCompletion;
+                !!(localSymbol.flags & 1048576 /* ExportValue */) && checker.getExportSymbolOfSymbol(localSymbol) === recommendedCompletion;
         }
         function trueOrUndefined(b) {
             return b ? true : undefined;
@@ -73255,9 +89690,13 @@ var ts;
         }
         function getCompletionEntriesFromSymbols(symbols, entries, location, sourceFile, typeChecker, target, log, kind, preferences, propertyAccessToConvert, isJsxInitializer, recommendedCompletion, symbolToOriginInfoMap) {
             var start = ts.timestamp();
+            // Tracks unique names.
+            // We don't set this for global variables or completions from external module exports, because we can have multiple of those.
+            // Based on the order we add things we will always see locals first, then globals, then module exports.
+            // So adding a completion for a local will prevent us from adding completions for external module exports sharing the same name.
             var uniques = ts.createMap();
-            for (var _i = 0, symbols_4 = symbols; _i < symbols_4.length; _i++) {
-                var symbol = symbols_4[_i];
+            for (var _i = 0, symbols_1 = symbols; _i < symbols_1.length; _i++) {
+                var symbol = symbols_1[_i];
                 var origin = symbolToOriginInfoMap ? symbolToOriginInfoMap[ts.getSymbolId(symbol)] : undefined;
                 var entry = createCompletionEntry(symbol, location, sourceFile, typeChecker, target, kind, origin, recommendedCompletion, propertyAccessToConvert, isJsxInitializer, preferences);
                 if (!entry) {
@@ -73267,7 +89706,8 @@ var ts;
                 if (uniques.has(name)) {
                     continue;
                 }
-                if (!origin && !(symbol.parent === undefined && !ts.some(symbol.declarations, function (d) { return d.getSourceFile() === location.getSourceFile(); }))) {
+                // Latter case tests whether this is a global variable.
+                if (!origin && !(symbol.parent === undefined && !ts.some(symbol.declarations, function (d) { return d.getSourceFile() === location.getSourceFile(); }))) { // TODO: GH#18217
                     uniques.set(name, true);
                 }
                 entries.push(entry);
@@ -73295,8 +89735,8 @@ var ts;
                         uniques.set(name, true);
                         entries.push({
                             name: name,
-                            kindModifiers: "",
-                            kind: "label",
+                            kindModifiers: "" /* none */,
+                            kind: "label" /* label */,
                             sortText: "0"
                         });
                     }
@@ -73313,44 +89753,80 @@ var ts;
         })(StringLiteralCompletionKind || (StringLiteralCompletionKind = {}));
         function getStringLiteralCompletionEntries(sourceFile, node, position, typeChecker, compilerOptions, host) {
             switch (node.parent.kind) {
-                case 178:
+                case 178 /* LiteralType */:
                     switch (node.parent.parent.kind) {
-                        case 162:
-                            return { kind: 2, types: getStringLiteralTypes(typeChecker.getTypeArgumentConstraint(node.parent), typeChecker), isNewIdentifier: false };
-                        case 176:
+                        case 162 /* TypeReference */:
+                            return { kind: 2 /* Types */, types: getStringLiteralTypes(typeChecker.getTypeArgumentConstraint(node.parent)), isNewIdentifier: false };
+                        case 176 /* IndexedAccessType */:
+                            // Get all apparent property names
+                            // i.e. interface Foo {
+                            //          foo: string;
+                            //          bar: string;
+                            //      }
+                            //      let x: Foo["/*completion position*/"]
                             return stringLiteralCompletionsFromProperties(typeChecker.getTypeFromTypeNode(node.parent.parent.objectType));
-                        case 179:
-                            return { kind: 0, paths: Completions.PathCompletions.getStringLiteralCompletionsFromModuleNames(sourceFile, node, compilerOptions, host, typeChecker) };
+                        case 179 /* ImportType */:
+                            return { kind: 0 /* Paths */, paths: Completions.PathCompletions.getStringLiteralCompletionsFromModuleNames(sourceFile, node, compilerOptions, host, typeChecker) };
                         default:
                             return undefined;
                     }
-                case 270:
+                case 270 /* PropertyAssignment */:
                     if (ts.isObjectLiteralExpression(node.parent.parent) && node.parent.name === node) {
+                        // Get quoted name of properties of the object literal expression
+                        // i.e. interface ConfigFiles {
+                        //          'jspm:dev': string
+                        //      }
+                        //      let files: ConfigFiles = {
+                        //          '/*completion position*/'
+                        //      }
+                        //
+                        //      function foo(c: ConfigFiles) {}
+                        //      foo({
+                        //          '/*completion position*/'
+                        //      });
                         return stringLiteralCompletionsFromProperties(typeChecker.getContextualType(node.parent.parent));
                     }
                     return fromContextualType();
-                case 186: {
+                case 186 /* ElementAccessExpression */: {
                     var _a = node.parent, expression = _a.expression, argumentExpression = _a.argumentExpression;
                     if (node === argumentExpression) {
+                        // Get all names of properties on the expression
+                        // i.e. interface A {
+                        //      'prop1': string
+                        // }
+                        // let a: A;
+                        // a['/*completion position*/']
                         return stringLiteralCompletionsFromProperties(typeChecker.getTypeAtLocation(expression));
                     }
                     return undefined;
                 }
-                case 187:
-                case 188:
-                    if (!ts.isRequireCall(node.parent, false) && !ts.isImportCall(node.parent)) {
+                case 187 /* CallExpression */:
+                case 188 /* NewExpression */:
+                    if (!ts.isRequireCall(node.parent, /*checkArgumentIsStringLiteralLike*/ false) && !ts.isImportCall(node.parent)) {
                         var argumentInfo = ts.SignatureHelp.getArgumentInfoForCompletions(node, position, sourceFile);
+                        // Get string literal completions from specialized signatures of the target
+                        // i.e. declare function f(a: 'A');
+                        // f("/*completion position*/")
                         return argumentInfo ? getStringLiteralCompletionsFromSignature(argumentInfo, typeChecker) : fromContextualType();
                     }
-                case 244:
-                case 250:
-                case 254:
-                    return { kind: 0, paths: Completions.PathCompletions.getStringLiteralCompletionsFromModuleNames(sourceFile, node, compilerOptions, host, typeChecker) };
+                // falls through (is `require("")` or `import("")`)
+                case 244 /* ImportDeclaration */:
+                case 250 /* ExportDeclaration */:
+                case 254 /* ExternalModuleReference */:
+                    // Get all known external module names or complete a path to a module
+                    // i.e. import * as ns from "/*completion position*/";
+                    //      var y = import("/*completion position*/");
+                    //      import x = require("/*completion position*/");
+                    //      var y = require("/*completion position*/");
+                    //      export * from "/*completion position*/";
+                    return { kind: 0 /* Paths */, paths: Completions.PathCompletions.getStringLiteralCompletionsFromModuleNames(sourceFile, node, compilerOptions, host, typeChecker) };
                 default:
                     return fromContextualType();
             }
             function fromContextualType() {
-                return { kind: 2, types: getStringLiteralTypes(getContextualTypeFromParent(node, typeChecker), typeChecker), isNewIdentifier: false };
+                // Get completion for string literal from string literal type
+                // i.e. var x: "hi" | "hello" = "/*completion position*/"
+                return { kind: 2 /* Types */, types: getStringLiteralTypes(getContextualTypeFromParent(node, typeChecker)), isNewIdentifier: false };
             }
         }
         function getStringLiteralCompletionsFromSignature(argumentInfo, checker) {
@@ -73362,22 +89838,22 @@ var ts;
                 if (!candidate.hasRestParameter && argumentInfo.argumentCount > candidate.parameters.length)
                     return;
                 var type = checker.getParameterType(candidate, argumentInfo.argumentIndex);
-                isNewIdentifier = isNewIdentifier || !!(type.flags & 4);
-                return getStringLiteralTypes(type, checker, uniques);
+                isNewIdentifier = isNewIdentifier || !!(type.flags & 4 /* String */);
+                return getStringLiteralTypes(type, uniques);
             });
-            return { kind: 2, types: types, isNewIdentifier: isNewIdentifier };
+            return { kind: 2 /* Types */, types: types, isNewIdentifier: isNewIdentifier };
         }
         function stringLiteralCompletionsFromProperties(type) {
-            return type && { kind: 1, symbols: type.getApparentProperties(), hasIndexSignature: hasIndexSignature(type) };
+            return type && { kind: 1 /* Properties */, symbols: type.getApparentProperties(), hasIndexSignature: hasIndexSignature(type) };
         }
-        function getStringLiteralTypes(type, typeChecker, uniques) {
+        function getStringLiteralTypes(type, uniques) {
             if (uniques === void 0) { uniques = ts.createMap(); }
             if (!type)
                 return ts.emptyArray;
             type = ts.skipConstraint(type);
             return type.isUnion()
-                ? ts.flatMap(type.types, function (t) { return getStringLiteralTypes(t, typeChecker, uniques); })
-                : type.isStringLiteral() && !(type.flags & 512) && ts.addToSeen(uniques, type.value)
+                ? ts.flatMap(type.types, function (t) { return getStringLiteralTypes(t, uniques); })
+                : type.isStringLiteral() && !(type.flags & 512 /* EnumLiteral */) && ts.addToSeen(uniques, type.value)
                     ? [type]
                     : ts.emptyArray;
         }
@@ -73387,10 +89863,17 @@ var ts;
             if (!completionData) {
                 return { type: "none" };
             }
-            if (completionData.kind !== 0) {
+            if (completionData.kind !== 0 /* Data */) {
                 return { type: "request", request: completionData };
             }
-            var symbols = completionData.symbols, location = completionData.location, completionKind = completionData.completionKind, symbolToOriginInfoMap = completionData.symbolToOriginInfoMap, previousToken = completionData.previousToken, isJsxInitializer = completionData.isJsxInitializer;
+            var symbols = completionData.symbols, literals = completionData.literals, location = completionData.location, completionKind = completionData.completionKind, symbolToOriginInfoMap = completionData.symbolToOriginInfoMap, previousToken = completionData.previousToken, isJsxInitializer = completionData.isJsxInitializer;
+            var literal = ts.find(literals, function (l) { return completionNameForLiteral(l) === entryId.name; });
+            if (literal !== undefined)
+                return { type: "literal", literal: literal };
+            // Find the symbol with the matching entry name.
+            // We don't need to perform character checks here because we're only comparing the
+            // name against 'entryName' (which is known to be good), not building a new
+            // completion entry.
             return ts.firstDefined(symbols, function (symbol) {
                 var origin = symbolToOriginInfoMap[ts.getSymbolId(symbol)];
                 var info = getCompletionEntryDisplayNameForSymbol(symbol, compilerOptions.target, origin, completionKind);
@@ -73400,7 +89883,8 @@ var ts;
             }) || { type: "none" };
         }
         function getSymbolName(symbol, origin, target) {
-            return origin && origin.type === "export" && origin.isDefaultExport && symbol.escapedName === "default"
+            return origin && origin.type === "export" && origin.isDefaultExport && symbol.escapedName === "default" /* Default */
+                // Name of "export default foo;" is "foo". Name of "export default 0" is the filename converted to camelCase.
                 ? ts.firstDefined(symbol.declarations, function (d) { return ts.isExportAssignment(d) && ts.isIdentifier(d.expression) ? d.expression.text : undefined; })
                     || ts.codefix.moduleSymbolToValidIdentifier(origin.moduleSymbol, target)
                 : symbol.name;
@@ -73414,18 +89898,19 @@ var ts;
                 var stringLiteralCompletions = !contextToken || !ts.isStringLiteralLike(contextToken)
                     ? undefined
                     : getStringLiteralCompletionEntries(sourceFile, contextToken, position, typeChecker, compilerOptions, host);
-                return stringLiteralCompletions && stringLiteralCompletionDetails(name, contextToken, stringLiteralCompletions, sourceFile, typeChecker, cancellationToken);
+                return stringLiteralCompletions && stringLiteralCompletionDetails(name, contextToken, stringLiteralCompletions, sourceFile, typeChecker, cancellationToken); // TODO: GH#18217
             }
+            // Compute all the completion symbols again.
             var symbolCompletion = getSymbolCompletionFromEntryId(program, log, sourceFile, position, entryId);
             switch (symbolCompletion.type) {
                 case "request": {
                     var request = symbolCompletion.request;
                     switch (request.kind) {
-                        case 1:
+                        case 1 /* JsDocTagName */:
                             return ts.JsDoc.getJSDocTagNameCompletionDetails(name);
-                        case 2:
+                        case 2 /* JsDocTag */:
                             return ts.JsDoc.getJSDocTagCompletionDetails(name);
-                        case 3:
+                        case 3 /* JsDocParameterName */:
                             return ts.JsDoc.getJSDocParameterNameCompletionDetails(name);
                         default:
                             return ts.Debug.assertNever(request);
@@ -73434,31 +89919,41 @@ var ts;
                 case "symbol": {
                     var symbol = symbolCompletion.symbol, location = symbolCompletion.location, symbolToOriginInfoMap = symbolCompletion.symbolToOriginInfoMap, previousToken = symbolCompletion.previousToken;
                     var _a = getCompletionEntryCodeActionsAndSourceDisplay(symbolToOriginInfoMap, symbol, program, typeChecker, host, compilerOptions, sourceFile, previousToken, formatContext, getCanonicalFileName, program.getSourceFiles(), preferences), codeActions = _a.codeActions, sourceDisplay = _a.sourceDisplay;
-                    return createCompletionDetailsForSymbol(symbol, typeChecker, sourceFile, location, cancellationToken, codeActions, sourceDisplay);
+                    return createCompletionDetailsForSymbol(symbol, typeChecker, sourceFile, location, cancellationToken, codeActions, sourceDisplay); // TODO: GH#18217
+                }
+                case "literal": {
+                    var literal = symbolCompletion.literal;
+                    return createSimpleDetails(completionNameForLiteral(literal), "string" /* string */, typeof literal === "string" ? ts.SymbolDisplayPartKind.stringLiteral : ts.SymbolDisplayPartKind.numericLiteral);
                 }
                 case "none":
-                    return allKeywordsCompletions().some(function (c) { return c.name === name; }) ? createCompletionDetails(name, "", "keyword", [ts.displayPart(name, ts.SymbolDisplayPartKind.keyword)]) : undefined;
+                    // Didn't find a symbol with this name.  See if we can find a keyword instead.
+                    return allKeywordsCompletions().some(function (c) { return c.name === name; }) ? createSimpleDetails(name, "keyword" /* keyword */, ts.SymbolDisplayPartKind.keyword) : undefined;
+                default:
+                    ts.Debug.assertNever(symbolCompletion);
             }
         }
         Completions.getCompletionEntryDetails = getCompletionEntryDetails;
+        function createSimpleDetails(name, kind, kind2) {
+            return createCompletionDetails(name, "" /* none */, kind, [ts.displayPart(name, kind2)]);
+        }
         function createCompletionDetailsForSymbol(symbol, checker, sourceFile, location, cancellationToken, codeActions, sourceDisplay) {
             var _a = checker.runWithCancellationToken(cancellationToken, function (checker) {
-                return ts.SymbolDisplay.getSymbolDisplayPartsDocumentationAndSymbolKind(checker, symbol, sourceFile, location, location, 7);
+                return ts.SymbolDisplay.getSymbolDisplayPartsDocumentationAndSymbolKind(checker, symbol, sourceFile, location, location, 7 /* All */);
             }), displayParts = _a.displayParts, documentation = _a.documentation, symbolKind = _a.symbolKind, tags = _a.tags;
             return createCompletionDetails(symbol.name, ts.SymbolDisplay.getSymbolModifiers(symbol), symbolKind, displayParts, documentation, tags, codeActions, sourceDisplay);
         }
         function stringLiteralCompletionDetails(name, location, completion, sourceFile, checker, cancellationToken) {
             switch (completion.kind) {
-                case 0: {
+                case 0 /* Paths */: {
                     var match = ts.find(completion.paths, function (p) { return p.name === name; });
-                    return match && createCompletionDetails(name, "", match.kind, [ts.textPart(name)]);
+                    return match && createCompletionDetails(name, "" /* none */, match.kind, [ts.textPart(name)]);
                 }
-                case 1: {
+                case 1 /* Properties */: {
                     var match = ts.find(completion.symbols, function (s) { return s.name === name; });
                     return match && createCompletionDetailsForSymbol(match, checker, sourceFile, location, cancellationToken);
                 }
-                case 2:
-                    return ts.find(completion.types, function (t) { return t.value === name; }) ? createCompletionDetails(name, "", "type", [ts.textPart(name)]) : undefined;
+                case 2 /* Types */:
+                    return ts.find(completion.types, function (t) { return t.value === name; }) ? createCompletionDetails(name, "" /* none */, "type" /* typeElement */, [ts.textPart(name)]) : undefined;
                 default:
                     return ts.Debug.assertNever(completion);
             }
@@ -73497,58 +89992,61 @@ var ts;
             CompletionKind[CompletionKind["String"] = 4] = "String";
             CompletionKind[CompletionKind["None"] = 5] = "None";
         })(CompletionKind || (CompletionKind = {}));
-        function getRecommendedCompletion(currentToken, position, sourceFile, checker) {
-            var contextualType = getContextualType(currentToken, position, sourceFile, checker);
+        function getRecommendedCompletion(previousToken, contextualType, checker) {
+            // For a union, return the first one with a recommended completion.
             return ts.firstDefined(contextualType && (contextualType.isUnion() ? contextualType.types : [contextualType]), function (type) {
                 var symbol = type && type.symbol;
-                return symbol && (symbol.flags & (8 | 384 | 32) && !ts.isAbstractConstructorSymbol(symbol))
-                    ? getFirstSymbolInChain(symbol, currentToken, checker)
+                // Don't include make a recommended completion for an abstract class
+                return symbol && (symbol.flags & (8 /* EnumMember */ | 384 /* Enum */ | 32 /* Class */) && !ts.isAbstractConstructorSymbol(symbol))
+                    ? getFirstSymbolInChain(symbol, previousToken, checker)
                     : undefined;
             });
         }
-        function getContextualType(currentToken, position, sourceFile, checker) {
-            var parent = currentToken.parent;
-            switch (currentToken.kind) {
-                case 71:
-                    return getContextualTypeFromParent(currentToken, checker);
-                case 58:
+        function getContextualType(previousToken, position, sourceFile, checker) {
+            var parent = previousToken.parent;
+            switch (previousToken.kind) {
+                case 71 /* Identifier */:
+                    return getContextualTypeFromParent(previousToken, checker);
+                case 58 /* EqualsToken */:
                     switch (parent.kind) {
-                        case 232:
-                            return checker.getContextualType(parent.initializer);
-                        case 200:
+                        case 232 /* VariableDeclaration */:
+                            return checker.getContextualType(parent.initializer); // TODO: GH#18217
+                        case 200 /* BinaryExpression */:
                             return checker.getTypeAtLocation(parent.left);
-                        case 262:
+                        case 262 /* JsxAttribute */:
                             return checker.getContextualTypeForJsxAttribute(parent);
                         default:
                             return undefined;
                     }
-                case 94:
+                case 94 /* NewKeyword */:
                     return checker.getContextualType(parent);
-                case 73:
+                case 73 /* CaseKeyword */:
                     return getSwitchedType(ts.cast(parent, ts.isCaseClause), checker);
-                case 17:
-                    return ts.isJsxExpression(parent) && parent.parent.kind !== 255 ? checker.getContextualTypeForJsxAttribute(parent.parent) : undefined;
+                case 17 /* OpenBraceToken */:
+                    return ts.isJsxExpression(parent) && parent.parent.kind !== 255 /* JsxElement */ ? checker.getContextualTypeForJsxAttribute(parent.parent) : undefined;
                 default:
-                    var argInfo = ts.SignatureHelp.getArgumentInfoForCompletions(currentToken, position, sourceFile);
+                    var argInfo = ts.SignatureHelp.getArgumentInfoForCompletions(previousToken, position, sourceFile);
                     return argInfo
-                        ? checker.getContextualTypeForArgumentAtIndex(argInfo.invocation, argInfo.argumentIndex + (currentToken.kind === 26 ? 1 : 0))
-                        : isEqualityOperatorKind(currentToken.kind) && ts.isBinaryExpression(parent) && isEqualityOperatorKind(parent.operatorToken.kind)
+                        // At `,`, treat this as the next argument after the comma.
+                        ? checker.getContextualTypeForArgumentAtIndex(argInfo.invocation, argInfo.argumentIndex + (previousToken.kind === 26 /* CommaToken */ ? 1 : 0))
+                        : isEqualityOperatorKind(previousToken.kind) && ts.isBinaryExpression(parent) && isEqualityOperatorKind(parent.operatorToken.kind)
+                            // completion at `x ===/**/` should be for the right side
                             ? checker.getTypeAtLocation(parent.left)
-                            : checker.getContextualType(currentToken);
+                            : checker.getContextualType(previousToken);
             }
         }
         function getContextualTypeFromParent(node, checker) {
             var parent = node.parent;
             switch (parent.kind) {
-                case 188:
+                case 188 /* NewExpression */:
                     return checker.getContextualType(parent);
-                case 200: {
+                case 200 /* BinaryExpression */: {
                     var _a = parent, left = _a.left, operatorToken = _a.operatorToken, right = _a.right;
                     return isEqualityOperatorKind(operatorToken.kind)
                         ? checker.getTypeAtLocation(node === right ? left : right)
                         : checker.getContextualType(node);
                 }
-                case 266:
+                case 266 /* CaseClause */:
                     return parent.expression === node ? getSwitchedType(parent, checker) : undefined;
                 default:
                     return checker.getContextualType(node);
@@ -73558,143 +90056,186 @@ var ts;
             return checker.getTypeAtLocation(caseClause.parent.parent.expression);
         }
         function getFirstSymbolInChain(symbol, enclosingDeclaration, checker) {
-            var chain = checker.getAccessibleSymbolChain(symbol, enclosingDeclaration, 67108863, false);
+            var chain = checker.getAccessibleSymbolChain(symbol, enclosingDeclaration, /*meaning*/ 67108863 /* All */, /*useOnlyExternalAliasing*/ false);
             if (chain)
                 return ts.first(chain);
             return symbol.parent && (isModuleSymbol(symbol.parent) ? symbol : getFirstSymbolInChain(symbol.parent, enclosingDeclaration, checker));
         }
         function isModuleSymbol(symbol) {
-            return symbol.declarations.some(function (d) { return d.kind === 274; });
+            return symbol.declarations.some(function (d) { return d.kind === 274 /* SourceFile */; });
         }
         function getCompletionData(program, log, sourceFile, isUncheckedFile, position, preferences, detailsEntryId) {
             var typeChecker = program.getTypeChecker();
             var start = ts.timestamp();
-            var currentToken = ts.getTokenAtPosition(sourceFile, position, false);
+            var currentToken = ts.getTokenAtPosition(sourceFile, position, /*includeJsDocComment*/ false); // TODO: GH#15853
+            // We will check for jsdoc comments with insideComment and getJsDocTagAtPosition. (TODO: that seems rather inefficient to check the same thing so many times.)
             log("getCompletionData: Get current token: " + (ts.timestamp() - start));
             start = ts.timestamp();
+            // Completion not allowed inside comments, bail out if this is the case
             var insideComment = ts.isInComment(sourceFile, position, currentToken);
             log("getCompletionData: Is inside comment: " + (ts.timestamp() - start));
             var insideJsDocTagTypeExpression = false;
             var isInSnippetScope = false;
             if (insideComment) {
                 if (ts.hasDocComment(sourceFile, position)) {
-                    if (sourceFile.text.charCodeAt(position - 1) === 64) {
-                        return { kind: 1 };
+                    if (sourceFile.text.charCodeAt(position - 1) === 64 /* at */) {
+                        // The current position is next to the '@' sign, when no tag name being provided yet.
+                        // Provide a full list of tag names
+                        return { kind: 1 /* JsDocTagName */ };
                     }
                     else {
+                        // When completion is requested without "@", we will have check to make sure that
+                        // there are no comments prefix the request position. We will only allow "*" and space.
+                        // e.g
+                        //   /** |c| /*
+                        //
+                        //   /**
+                        //     |c|
+                        //    */
+                        //
+                        //   /**
+                        //    * |c|
+                        //    */
+                        //
+                        //   /**
+                        //    *         |c|
+                        //    */
                         var lineStart = ts.getLineStartPositionForPosition(position, sourceFile);
                         if (!(sourceFile.text.substring(lineStart, position).match(/[^\*|\s|(/\*\*)]/))) {
-                            return { kind: 2 };
+                            return { kind: 2 /* JsDocTag */ };
                         }
                     }
                 }
+                // Completion should work inside certain JsDoc tags. For example:
+                //     /** @type {number | string} */
+                // Completion should work in the brackets
                 var tag = getJsDocTagAtPosition(currentToken, position);
                 if (tag) {
                     if (tag.tagName.pos <= position && position <= tag.tagName.end) {
-                        return { kind: 1 };
+                        return { kind: 1 /* JsDocTagName */ };
                     }
-                    if (isTagWithTypeExpression(tag) && tag.typeExpression && tag.typeExpression.kind === 278) {
-                        currentToken = ts.getTokenAtPosition(sourceFile, position, true);
+                    if (isTagWithTypeExpression(tag) && tag.typeExpression && tag.typeExpression.kind === 278 /* JSDocTypeExpression */) {
+                        currentToken = ts.getTokenAtPosition(sourceFile, position, /*includeJsDocComment*/ true);
                         if (!currentToken ||
                             (!ts.isDeclarationName(currentToken) &&
-                                (currentToken.parent.kind !== 298 ||
+                                (currentToken.parent.kind !== 298 /* JSDocPropertyTag */ ||
                                     currentToken.parent.name !== currentToken))) {
+                            // Use as type location if inside tag's type expression
                             insideJsDocTagTypeExpression = isCurrentlyEditingNode(tag.typeExpression);
                         }
                     }
                     if (ts.isJSDocParameterTag(tag) && (ts.nodeIsMissing(tag.name) || tag.name.pos <= position && position <= tag.name.end)) {
-                        return { kind: 3, tag: tag };
+                        return { kind: 3 /* JsDocParameterName */, tag: tag };
                     }
                 }
                 if (!insideJsDocTagTypeExpression) {
+                    // Proceed if the current position is in jsDoc tag expression; otherwise it is a normal
+                    // comment or the plain text part of a jsDoc comment, so no completion should be available
                     log("Returning an empty list because completion was inside a regular comment or plain text part of a JsDoc comment.");
                     return undefined;
                 }
             }
             start = ts.timestamp();
-            var previousToken = ts.findPrecedingToken(position, sourceFile, undefined, insideJsDocTagTypeExpression);
+            var previousToken = ts.findPrecedingToken(position, sourceFile, /*startNode*/ undefined, insideJsDocTagTypeExpression); // TODO: GH#18217
             log("getCompletionData: Get previous token 1: " + (ts.timestamp() - start));
+            // The decision to provide completion depends on the contextToken, which is determined through the previousToken.
+            // Note: 'previousToken' (and thus 'contextToken') can be undefined if we are the beginning of the file
             var contextToken = previousToken;
+            // Check if the caret is at the end of an identifier; this is a partial identifier that we want to complete: e.g. a.toS|
+            // Skip this partial identifier and adjust the contextToken to the token that precedes it.
             if (contextToken && position <= contextToken.end && (ts.isIdentifier(contextToken) || ts.isKeyword(contextToken.kind))) {
-                var start_4 = ts.timestamp();
-                contextToken = ts.findPrecedingToken(contextToken.getFullStart(), sourceFile, undefined, insideJsDocTagTypeExpression);
-                log("getCompletionData: Get previous token 2: " + (ts.timestamp() - start_4));
+                var start_1 = ts.timestamp();
+                contextToken = ts.findPrecedingToken(contextToken.getFullStart(), sourceFile, /*startNode*/ undefined, insideJsDocTagTypeExpression); // TODO: GH#18217
+                log("getCompletionData: Get previous token 2: " + (ts.timestamp() - start_1));
             }
+            // Find the node where completion is requested on.
+            // Also determine whether we are trying to complete with members of that node
+            // or attributes of a JSX tag.
             var node = currentToken;
             var propertyAccessToConvert;
             var isRightOfDot = false;
             var isRightOfOpenTag = false;
             var isStartingCloseTag = false;
             var isJsxInitializer = false;
-            var location = ts.getTouchingPropertyName(sourceFile, position, insideJsDocTagTypeExpression);
+            var location = ts.getTouchingPropertyName(sourceFile, position);
             if (contextToken) {
+                // Bail out if this is a known invalid completion location
                 if (isCompletionListBlocker(contextToken)) {
                     log("Returning an empty list because completion was requested in an invalid position.");
                     return undefined;
                 }
                 var parent = contextToken.parent;
-                if (contextToken.kind === 23) {
+                if (contextToken.kind === 23 /* DotToken */) {
                     isRightOfDot = true;
                     switch (parent.kind) {
-                        case 185:
+                        case 185 /* PropertyAccessExpression */:
                             propertyAccessToConvert = parent;
                             node = propertyAccessToConvert.expression;
                             break;
-                        case 146:
+                        case 146 /* QualifiedName */:
                             node = parent.left;
                             break;
-                        case 179:
-                        case 210:
+                        case 179 /* ImportType */:
+                        case 210 /* MetaProperty */:
                             node = parent;
                             break;
                         default:
+                            // There is nothing that precedes the dot, so this likely just a stray character
+                            // or leading into a '...' token. Just bail out instead.
                             return undefined;
                     }
                 }
-                else if (sourceFile.languageVariant === 1) {
-                    if (parent && parent.kind === 185) {
+                else if (sourceFile.languageVariant === 1 /* JSX */) {
+                    // <UI.Test /* completion position */ />
+                    // If the tagname is a property access expression, we will then walk up to the top most of property access expression.
+                    // Then, try to get a JSX container and its associated attributes type.
+                    if (parent && parent.kind === 185 /* PropertyAccessExpression */) {
                         contextToken = parent;
                         parent = parent.parent;
                     }
+                    // Fix location
                     if (currentToken.parent === location) {
                         switch (currentToken.kind) {
-                            case 29:
-                                if (currentToken.parent.kind === 255 || currentToken.parent.kind === 257) {
+                            case 29 /* GreaterThanToken */:
+                                if (currentToken.parent.kind === 255 /* JsxElement */ || currentToken.parent.kind === 257 /* JsxOpeningElement */) {
                                     location = currentToken;
                                 }
                                 break;
-                            case 41:
-                                if (currentToken.parent.kind === 256) {
+                            case 41 /* SlashToken */:
+                                if (currentToken.parent.kind === 256 /* JsxSelfClosingElement */) {
                                     location = currentToken;
                                 }
                                 break;
                         }
                     }
                     switch (parent.kind) {
-                        case 258:
-                            if (contextToken.kind === 41) {
+                        case 258 /* JsxClosingElement */:
+                            if (contextToken.kind === 41 /* SlashToken */) {
                                 isStartingCloseTag = true;
                                 location = contextToken;
                             }
                             break;
-                        case 200:
-                            if (!(parent.left.flags & 32768)) {
+                        case 200 /* BinaryExpression */:
+                            if (!(parent.left.flags & 32768 /* ThisNodeHasError */)) {
+                                // It has a left-hand side, so we're not in an opening JSX tag.
                                 break;
                             }
-                        case 256:
-                        case 255:
-                        case 257:
-                            if (contextToken.kind === 27) {
+                        // falls through
+                        case 256 /* JsxSelfClosingElement */:
+                        case 255 /* JsxElement */:
+                        case 257 /* JsxOpeningElement */:
+                            if (contextToken.kind === 27 /* LessThanToken */) {
                                 isRightOfOpenTag = true;
                                 location = contextToken;
                             }
                             break;
-                        case 262:
+                        case 262 /* JsxAttribute */:
                             switch (previousToken.kind) {
-                                case 58:
+                                case 58 /* EqualsToken */:
                                     isJsxInitializer = true;
                                     break;
-                                case 71:
+                                case 71 /* Identifier */:
+                                    // For `<div x=[|f/**/|]`, `parent` will be `x` and `previousToken.parent` will be `f` (which is its own JsxAttribute)
                                     if (parent !== previousToken.parent && !parent.initializer) {
                                         isJsxInitializer = previousToken;
                                     }
@@ -73704,9 +90245,9 @@ var ts;
                 }
             }
             var semanticStart = ts.timestamp();
-            var completionKind = 5;
+            var completionKind = 5 /* None */;
             var isNewIdentifierLocation = false;
-            var keywordFilters = 0;
+            var keywordFilters = 0 /* None */;
             var symbols = [];
             var symbolToOriginInfoMap = [];
             if (isRightOfDot) {
@@ -73716,7 +90257,7 @@ var ts;
                 var tagSymbols = ts.Debug.assertEachDefined(typeChecker.getJsxIntrinsicTagNamesAt(location), "getJsxIntrinsicTagNames() should all be defined");
                 tryGetGlobalSymbols();
                 symbols = tagSymbols.concat(symbols);
-                completionKind = 3;
+                completionKind = 3 /* MemberLike */;
             }
             else if (isStartingCloseTag) {
                 var tagName = contextToken.parent.parent.openingElement.tagName;
@@ -73724,30 +90265,37 @@ var ts;
                 if (tagSymbol) {
                     symbols = [tagSymbol];
                 }
-                completionKind = 3;
+                completionKind = 3 /* MemberLike */;
             }
             else {
+                // For JavaScript or TypeScript, if we're not after a dot, then just try to get the
+                // global symbols in scope.  These results should be valid for either language as
+                // the set of symbols that can be referenced from this location.
                 if (!tryGetGlobalSymbols()) {
                     return undefined;
                 }
             }
             log("getCompletionData: Semantic work: " + (ts.timestamp() - semanticStart));
-            var recommendedCompletion = previousToken && getRecommendedCompletion(previousToken, position, sourceFile, typeChecker);
-            return { kind: 0, symbols: symbols, completionKind: completionKind, isInSnippetScope: isInSnippetScope, propertyAccessToConvert: propertyAccessToConvert, isNewIdentifierLocation: isNewIdentifierLocation, location: location, keywordFilters: keywordFilters, symbolToOriginInfoMap: symbolToOriginInfoMap, recommendedCompletion: recommendedCompletion, previousToken: previousToken, isJsxInitializer: isJsxInitializer };
+            var contextualType = previousToken && getContextualType(previousToken, position, sourceFile, typeChecker);
+            var literals = ts.mapDefined(contextualType && (contextualType.isUnion() ? contextualType.types : [contextualType]), function (t) { return t.isLiteral() ? t.value : undefined; });
+            var recommendedCompletion = previousToken && contextualType && getRecommendedCompletion(previousToken, contextualType, typeChecker);
+            return { kind: 0 /* Data */, symbols: symbols, completionKind: completionKind, isInSnippetScope: isInSnippetScope, propertyAccessToConvert: propertyAccessToConvert, isNewIdentifierLocation: isNewIdentifierLocation, location: location, keywordFilters: keywordFilters, literals: literals, symbolToOriginInfoMap: symbolToOriginInfoMap, recommendedCompletion: recommendedCompletion, previousToken: previousToken, isJsxInitializer: isJsxInitializer };
             function isTagWithTypeExpression(tag) {
                 switch (tag.kind) {
-                    case 293:
-                    case 298:
-                    case 294:
-                    case 295:
-                    case 297:
+                    case 293 /* JSDocParameterTag */:
+                    case 298 /* JSDocPropertyTag */:
+                    case 294 /* JSDocReturnTag */:
+                    case 295 /* JSDocTypeTag */:
+                    case 297 /* JSDocTypedefTag */:
                         return true;
                     default:
                         return false;
                 }
             }
             function getTypeScriptMemberSymbols() {
-                completionKind = 2;
+                // Right of dot member completion list
+                completionKind = 2 /* PropertyAccess */;
+                // Since this is qualified name check its a type node location
                 var isImportType = ts.isLiteralImportTypeNode(node);
                 var isTypeLocation = insideJsDocTagTypeExpression || (isImportType && !node.isTypeOf) || ts.isPartOfTypeNode(node.parent);
                 var isRhsOfImportDeclaration = ts.isInRightSideOfInternalImportEqualsDeclaration(node);
@@ -73756,29 +90304,32 @@ var ts;
                     var symbol = typeChecker.getSymbolAtLocation(node);
                     if (symbol) {
                         symbol = ts.skipAlias(symbol, typeChecker);
-                        if (symbol.flags & (1536 | 384)) {
+                        if (symbol.flags & (1536 /* Module */ | 384 /* Enum */)) {
+                            // Extract module or enum members
                             var exportedSymbols = ts.Debug.assertEachDefined(typeChecker.getExportsOfModule(symbol), "getExportsOfModule() should all be defined");
                             var isValidValueAccess_1 = function (symbol) { return typeChecker.isValidPropertyAccess(isImportType ? node : (node.parent), symbol.name); };
                             var isValidTypeAccess_1 = function (symbol) { return symbolCanBeReferencedAtTypeLocation(symbol); };
                             var isValidAccess = allowTypeOrValue ?
+                                // Any kind is allowed when dotting off namespace in internal import equals declaration
                                 function (symbol) { return isValidTypeAccess_1(symbol) || isValidValueAccess_1(symbol); } :
                                 isTypeLocation ? isValidTypeAccess_1 : isValidValueAccess_1;
                             for (var _i = 0, exportedSymbols_1 = exportedSymbols; _i < exportedSymbols_1.length; _i++) {
-                                var symbol_2 = exportedSymbols_1[_i];
-                                if (isValidAccess(symbol_2)) {
-                                    symbols.push(symbol_2);
+                                var symbol_1 = exportedSymbols_1[_i];
+                                if (isValidAccess(symbol_1)) {
+                                    symbols.push(symbol_1);
                                 }
                             }
-                            if (!isTypeLocation && symbol.declarations.some(function (d) { return d.kind !== 274 && d.kind !== 239 && d.kind !== 238; })) {
+                            // If the module is merged with a value, we must get the type of the class and add its propertes (for inherited static methods).
+                            if (!isTypeLocation && symbol.declarations.some(function (d) { return d.kind !== 274 /* SourceFile */ && d.kind !== 239 /* ModuleDeclaration */ && d.kind !== 238 /* EnumDeclaration */; })) {
                                 addTypeProperties(typeChecker.getTypeOfSymbolAtLocation(symbol, node));
                             }
                             return;
                         }
                     }
                 }
-                if (ts.isMetaProperty(node) && (node.keywordToken === 94 || node.keywordToken === 91)) {
-                    var completion = (node.keywordToken === 94) ? "target" : "meta";
-                    symbols.push(typeChecker.createSymbol(4, ts.escapeLeadingUnderscores(completion)));
+                if (ts.isMetaProperty(node) && (node.keywordToken === 94 /* NewKeyword */ || node.keywordToken === 91 /* ImportKeyword */)) {
+                    var completion = (node.keywordToken === 94 /* NewKeyword */) ? "target" : "meta";
+                    symbols.push(typeChecker.createSymbol(4 /* Property */, ts.escapeLeadingUnderscores(completion)));
                     return;
                 }
                 if (!isTypeLocation) {
@@ -73786,23 +90337,29 @@ var ts;
                 }
             }
             function addTypeProperties(type) {
-                isNewIdentifierLocation = hasIndexSignature(type);
+                isNewIdentifierLocation = !!type.getStringIndexType();
                 if (isUncheckedFile) {
-                    symbols.push.apply(symbols, getPropertiesForCompletion(type, typeChecker, true));
+                    // In javascript files, for union types, we don't just get the members that
+                    // the individual types have in common, we also include all the members that
+                    // each individual type has. This is because we're going to add all identifiers
+                    // anyways. So we might as well elevate the members that were at least part
+                    // of the individual types to a higher status since we know what they are.
+                    symbols.push.apply(symbols, getPropertiesForCompletion(type, typeChecker, /*isForAccess*/ true));
                 }
                 else {
                     for (var _i = 0, _a = type.getApparentProperties(); _i < _a.length; _i++) {
                         var symbol = _a[_i];
-                        if (typeChecker.isValidPropertyAccessForCompletions(node.kind === 179 ? node : node.parent, type, symbol)) {
+                        if (typeChecker.isValidPropertyAccessForCompletions(node.kind === 179 /* ImportType */ ? node : node.parent, type, symbol)) {
                             addPropertySymbol(symbol);
                         }
                     }
                 }
             }
             function addPropertySymbol(symbol) {
+                // If this is e.g. [Symbol.iterator], add a completion for `Symbol`.
                 var symbolSymbol = ts.firstDefined(symbol.declarations, function (decl) {
                     var name = ts.getNameOfDeclaration(decl);
-                    var leftName = name.kind === 147 ? getLeftMostName(name.expression) : undefined;
+                    var leftName = name.kind === 147 /* ComputedPropertyName */ ? getLeftMostName(name.expression) : undefined;
                     return leftName && typeChecker.getSymbolAtLocation(leftName);
                 });
                 if (symbolSymbol) {
@@ -73813,6 +90370,7 @@ var ts;
                     symbols.push(symbol);
                 }
             }
+            /** Given 'a.b.c', returns 'a'. */
             function getLeftMostName(e) {
                 return ts.isIdentifier(e) ? e : ts.isPropertyAccessExpression(e) ? getLeftMostName(e.expression) : undefined;
             }
@@ -73822,47 +90380,78 @@ var ts;
                     || tryGetConstructorCompletion()
                     || tryGetClassLikeCompletionSymbols()
                     || tryGetJsxCompletionSymbols()
-                    || (getGlobalCompletions(), 1);
-                return result === 1;
+                    || (getGlobalCompletions(), 1 /* Success */);
+                return result === 1 /* Success */;
             }
             function tryGetConstructorCompletion() {
                 if (!tryGetConstructorLikeCompletionContainer(contextToken))
-                    return 0;
-                completionKind = 5;
+                    return 0 /* Continue */;
+                // no members, only keywords
+                completionKind = 5 /* None */;
+                // Declaring new property/method/accessor
                 isNewIdentifierLocation = true;
-                keywordFilters = 3;
-                return 1;
+                // Has keywords for constructor parameter
+                keywordFilters = 3 /* ConstructorParameterKeywords */;
+                return 1 /* Success */;
             }
             function tryGetJsxCompletionSymbols() {
                 var jsxContainer = tryGetContainingJsxElement(contextToken);
+                // Cursor is inside a JSX self-closing element or opening element
                 var attrsType = jsxContainer && typeChecker.getAllAttributesTypeFromJsxOpeningLikeElement(jsxContainer);
                 if (!attrsType)
-                    return 0;
+                    return 0 /* Continue */;
                 symbols = filterJsxAttributes(typeChecker.getPropertiesOfType(attrsType), jsxContainer.attributes.properties);
-                completionKind = 3;
+                completionKind = 3 /* MemberLike */;
                 isNewIdentifierLocation = false;
-                return 1;
+                return 1 /* Success */;
             }
             function getGlobalCompletions() {
                 if (tryGetFunctionLikeBodyCompletionContainer(contextToken)) {
-                    keywordFilters = 4;
+                    keywordFilters = 4 /* FunctionLikeBodyKeywords */;
                 }
-                completionKind = 1;
+                // Get all entities in the current scope.
+                completionKind = 1 /* Global */;
                 isNewIdentifierLocation = isNewIdentifierDefinitionLocation(contextToken);
                 if (previousToken !== contextToken) {
                     ts.Debug.assert(!!previousToken, "Expected 'contextToken' to be defined when different from 'previousToken'.");
                 }
+                // We need to find the node that will give us an appropriate scope to begin
+                // aggregating completion candidates. This is achieved in 'getScopeNode'
+                // by finding the first node that encompasses a position, accounting for whether a node
+                // is "complete" to decide whether a position belongs to the node.
+                //
+                // However, at the end of an identifier, we are interested in the scope of the identifier
+                // itself, but fall outside of the identifier. For instance:
+                //
+                //      xyz => x$
+                //
+                // the cursor is outside of both the 'x' and the arrow function 'xyz => x',
+                // so 'xyz' is not returned in our results.
+                //
+                // We define 'adjustedPosition' so that we may appropriately account for
+                // being at the end of an identifier. The intention is that if requesting completion
+                // at the end of an identifier, it should be effectively equivalent to requesting completion
+                // anywhere inside/at the beginning of the identifier. So in the previous case, the
+                // 'adjustedPosition' will work as if requesting completion in the following:
+                //
+                //      xyz => $x
+                //
+                // If previousToken !== contextToken, then
+                //   - 'contextToken' was adjusted to the token prior to 'previousToken'
+                //      because we were at the end of an identifier.
+                //   - 'previousToken' is defined.
                 var adjustedPosition = previousToken !== contextToken ?
                     previousToken.getStart() :
                     position;
                 var scopeNode = getScopeNode(contextToken, adjustedPosition, sourceFile) || sourceFile;
                 isInSnippetScope = isSnippetScope(scopeNode);
-                var symbolMeanings = 67901928 | 67216319 | 1920 | 2097152;
+                var symbolMeanings = 67901928 /* Type */ | 67216319 /* Value */ | 1920 /* Namespace */ | 2097152 /* Alias */;
                 symbols = ts.Debug.assertEachDefined(typeChecker.getSymbolsInScope(scopeNode, symbolMeanings), "getSymbolsInScope() should all be defined");
-                if (preferences.includeCompletionsWithInsertText && scopeNode.kind !== 274) {
+                // Need to insert 'this.' before properties of `this` type, so only do that if `includeInsertTextCompletions`
+                if (preferences.includeCompletionsWithInsertText && scopeNode.kind !== 274 /* SourceFile */) {
                     var thisType = typeChecker.tryGetThisTypeAt(scopeNode);
                     if (thisType) {
-                        for (var _i = 0, _a = getPropertiesForCompletion(thisType, typeChecker, true); _i < _a.length; _i++) {
+                        for (var _i = 0, _a = getPropertiesForCompletion(thisType, typeChecker, /*isForAccess*/ true); _i < _a.length; _i++) {
                             var symbol = _a[_i];
                             symbolToOriginInfoMap[ts.getSymbolId(symbol)] = { type: "this-type" };
                             symbols.push(symbol);
@@ -73875,24 +90464,30 @@ var ts;
                 filterGlobalCompletion(symbols);
             }
             function shouldOfferImportCompletions() {
+                // If not already a module, must have modules enabled and not currently be in a commonjs module. (TODO: import completions for commonjs)
                 if (!preferences.includeCompletionsForModuleExports)
                     return false;
+                // If already using ES6 modules, OK to continue using them.
                 if (sourceFile.externalModuleIndicator)
                     return true;
+                // If already using commonjs, don't introduce ES6.
                 if (sourceFile.commonJsModuleIndicator)
                     return false;
+                // If some file is using ES6 modules, assume that it's OK to add more.
                 if (ts.programContainsEs6Modules(program))
                     return true;
+                // For JS, stay on the safe side.
                 if (isUncheckedFile)
                     return false;
+                // If module transpilation is enabled or we're targeting es6 or above, or not emitting, OK.
                 return ts.compilerOptionsIndicateEs6Modules(program.getCompilerOptions());
             }
             function isSnippetScope(scopeNode) {
                 switch (scopeNode.kind) {
-                    case 274:
-                    case 202:
-                    case 265:
-                    case 213:
+                    case 274 /* SourceFile */:
+                    case 202 /* TemplateExpression */:
+                    case 265 /* JsxExpression */:
+                    case 213 /* Block */:
                         return true;
                     default:
                         return ts.isStatement(scopeNode);
@@ -73902,57 +90497,64 @@ var ts;
                 var isTypeOnlyCompletion = insideJsDocTagTypeExpression || !isContextTokenValueLocation(contextToken) && (ts.isPartOfTypeNode(location) || isContextTokenTypeLocation(contextToken));
                 var allowTypes = isTypeOnlyCompletion || !isContextTokenValueLocation(contextToken) && ts.isPossiblyTypeArgumentPosition(contextToken, sourceFile);
                 if (isTypeOnlyCompletion)
-                    keywordFilters = 5;
+                    keywordFilters = 5 /* TypeKeywords */;
                 ts.filterMutate(symbols, function (symbol) {
                     if (!ts.isSourceFile(location)) {
+                        // export = /**/ here we want to get all meanings, so any symbol is ok
                         if (ts.isExportAssignment(location.parent)) {
                             return true;
                         }
                         symbol = ts.skipAlias(symbol, typeChecker);
+                        // import m = /**/ <-- It can only access namespace (if typing import = x. this would get member symbols and not namespace)
                         if (ts.isInRightSideOfInternalImportEqualsDeclaration(location)) {
-                            return !!(symbol.flags & 1920);
+                            return !!(symbol.flags & 1920 /* Namespace */);
                         }
                         if (allowTypes) {
+                            // Its a type, but you can reach it by namespace.type as well
                             var symbolAllowedAsType = symbolCanBeReferencedAtTypeLocation(symbol);
                             if (symbolAllowedAsType || isTypeOnlyCompletion) {
                                 return symbolAllowedAsType;
                             }
                         }
                     }
-                    return !!(ts.getCombinedLocalAndExportSymbolFlags(symbol) & 67216319);
+                    // expressions are value space (which includes the value namespaces)
+                    return !!(ts.getCombinedLocalAndExportSymbolFlags(symbol) & 67216319 /* Value */);
                 });
             }
             function isContextTokenValueLocation(contextToken) {
                 return contextToken &&
-                    contextToken.kind === 103 &&
-                    (contextToken.parent.kind === 165 || ts.isTypeOfExpression(contextToken.parent));
+                    contextToken.kind === 103 /* TypeOfKeyword */ &&
+                    (contextToken.parent.kind === 165 /* TypeQuery */ || ts.isTypeOfExpression(contextToken.parent));
             }
             function isContextTokenTypeLocation(contextToken) {
                 if (contextToken) {
                     var parentKind = contextToken.parent.kind;
                     switch (contextToken.kind) {
-                        case 56:
-                            return parentKind === 152 ||
-                                parentKind === 151 ||
-                                parentKind === 149 ||
-                                parentKind === 232 ||
+                        case 56 /* ColonToken */:
+                            return parentKind === 152 /* PropertyDeclaration */ ||
+                                parentKind === 151 /* PropertySignature */ ||
+                                parentKind === 149 /* Parameter */ ||
+                                parentKind === 232 /* VariableDeclaration */ ||
                                 ts.isFunctionLikeKind(parentKind);
-                        case 58:
-                            return parentKind === 237;
-                        case 118:
-                            return parentKind === 208;
+                        case 58 /* EqualsToken */:
+                            return parentKind === 237 /* TypeAliasDeclaration */;
+                        case 118 /* AsKeyword */:
+                            return parentKind === 208 /* AsExpression */;
                     }
                 }
                 return false;
             }
             function symbolCanBeReferencedAtTypeLocation(symbol) {
                 symbol = symbol.exportSymbol || symbol;
+                // This is an alias, follow what it aliases
                 symbol = ts.skipAlias(symbol, typeChecker);
-                if (symbol.flags & 67901928) {
+                if (symbol.flags & 67901928 /* Type */) {
                     return true;
                 }
-                if (symbol.flags & 1536) {
+                if (symbol.flags & 1536 /* Module */) {
                     var exportedSymbols = typeChecker.getExportsOfModule(symbol);
+                    // If the exported symbols contains type,
+                    // symbol can be referenced at locations where type is allowed
                     return exportedSymbols.some(symbolCanBeReferencedAtTypeLocation);
                 }
                 return false;
@@ -73961,20 +90563,28 @@ var ts;
                 var tokenTextLowerCase = tokenText.toLowerCase();
                 var seenResolvedModules = ts.createMap();
                 ts.codefix.forEachExternalModuleToImportFrom(typeChecker, sourceFile, program.getSourceFiles(), function (moduleSymbol) {
+                    // Perf -- ignore other modules if this is a request for details
                     if (detailsEntryId && detailsEntryId.source && ts.stripQuotes(moduleSymbol.name) !== detailsEntryId.source) {
                         return;
                     }
                     var resolvedModuleSymbol = typeChecker.resolveExternalModuleSymbol(moduleSymbol);
+                    // resolvedModuleSymbol may be a namespace. A namespace may be `export =` by multiple module declarations, but only keep the first one.
                     if (!ts.addToSeen(seenResolvedModules, ts.getSymbolId(resolvedModuleSymbol))) {
                         return;
                     }
                     for (var _i = 0, _a = typeChecker.getExportsOfModule(moduleSymbol); _i < _a.length; _i++) {
                         var symbol = _a[_i];
+                        // Don't add a completion for a re-export, only for the original.
+                        // The actual import fix might end up coming from a re-export -- we don't compute that until getting completion details.
+                        // This is just to avoid adding duplicate completion entries.
+                        //
+                        // If `symbol.parent !== ...`, this comes from an `export * from "foo"` re-export. Those don't create new symbols.
+                        // If `some(...)`, this comes from an `export { foo } from "foo"` re-export, which creates a new symbol (thus isn't caught by the first check).
                         if (typeChecker.getMergedSymbol(symbol.parent) !== resolvedModuleSymbol
                             || ts.some(symbol.declarations, function (d) { return ts.isExportSpecifier(d) && !!d.parent.parent.moduleSpecifier; })) {
                             continue;
                         }
-                        var isDefaultExport = symbol.name === "default";
+                        var isDefaultExport = symbol.name === "default" /* Default */;
                         if (isDefaultExport) {
                             symbol = ts.getLocalSymbolForExportDefault(symbol) || symbol;
                         }
@@ -73986,6 +90596,11 @@ var ts;
                     }
                 });
             }
+            /**
+             * True if you could remove some characters in `a` to get `b`.
+             * E.g., true for "abcdef" and "bdf".
+             * But not true for "abcdef" and "dbf".
+             */
             function stringContainsCharactersInOrder(str, characters) {
                 if (characters.length === 0) {
                     return true;
@@ -73999,8 +90614,13 @@ var ts;
                         }
                     }
                 }
+                // Did not find all characters
                 return false;
             }
+            /**
+             * Finds the first node that "embraces" the position, so that one may
+             * accurately aggregate locals from the closest containing scope.
+             */
             function getScopeNode(initialToken, position, sourceFile) {
                 var scope = initialToken;
                 while (scope && !ts.positionBelongsToNode(scope, position, sourceFile)) {
@@ -74018,15 +90638,15 @@ var ts;
                 return result;
             }
             function isInJsxText(contextToken) {
-                if (contextToken.kind === 10) {
+                if (contextToken.kind === 10 /* JsxText */) {
                     return true;
                 }
-                if (contextToken.kind === 29 && contextToken.parent) {
-                    if (contextToken.parent.kind === 257) {
+                if (contextToken.kind === 29 /* GreaterThanToken */ && contextToken.parent) {
+                    if (contextToken.parent.kind === 257 /* JsxOpeningElement */) {
                         return true;
                     }
-                    if (contextToken.parent.kind === 258 || contextToken.parent.kind === 256) {
-                        return !!contextToken.parent.parent && contextToken.parent.parent.kind === 255;
+                    if (contextToken.parent.kind === 258 /* JsxClosingElement */ || contextToken.parent.kind === 256 /* JsxSelfClosingElement */) {
+                        return !!contextToken.parent.parent && contextToken.parent.parent.kind === 255 /* JsxElement */;
                     }
                 }
                 return false;
@@ -74035,149 +90655,201 @@ var ts;
                 if (previousToken) {
                     var containingNodeKind = previousToken.parent.kind;
                     switch (previousToken.kind) {
-                        case 26:
-                            return containingNodeKind === 187
-                                || containingNodeKind === 155
-                                || containingNodeKind === 188
-                                || containingNodeKind === 183
-                                || containingNodeKind === 200
-                                || containingNodeKind === 163;
-                        case 19:
-                            return containingNodeKind === 187
-                                || containingNodeKind === 155
-                                || containingNodeKind === 188
-                                || containingNodeKind === 191
-                                || containingNodeKind === 173;
-                        case 21:
-                            return containingNodeKind === 183
-                                || containingNodeKind === 160
-                                || containingNodeKind === 147;
-                        case 129:
-                        case 130:
+                        case 26 /* CommaToken */:
+                            return containingNodeKind === 187 /* CallExpression */ // func( a, |
+                                || containingNodeKind === 155 /* Constructor */ // constructor( a, |   /* public, protected, private keywords are allowed here, so show completion */
+                                || containingNodeKind === 188 /* NewExpression */ // new C(a, |
+                                || containingNodeKind === 183 /* ArrayLiteralExpression */ // [a, |
+                                || containingNodeKind === 200 /* BinaryExpression */ // const x = (a, |
+                                || containingNodeKind === 163 /* FunctionType */; // var x: (s: string, list|
+                        case 19 /* OpenParenToken */:
+                            return containingNodeKind === 187 /* CallExpression */ // func( |
+                                || containingNodeKind === 155 /* Constructor */ // constructor( |
+                                || containingNodeKind === 188 /* NewExpression */ // new C(a|
+                                || containingNodeKind === 191 /* ParenthesizedExpression */ // const x = (a|
+                                || containingNodeKind === 173 /* ParenthesizedType */; // function F(pred: (a| /* this can become an arrow function, where 'a' is the argument */
+                        case 21 /* OpenBracketToken */:
+                            return containingNodeKind === 183 /* ArrayLiteralExpression */ // [ |
+                                || containingNodeKind === 160 /* IndexSignature */ // [ | : string ]
+                                || containingNodeKind === 147 /* ComputedPropertyName */; // [ |    /* this can become an index signature */
+                        case 129 /* ModuleKeyword */: // module |
+                        case 130 /* NamespaceKeyword */: // namespace |
                             return true;
-                        case 23:
-                            return containingNodeKind === 239;
-                        case 17:
-                            return containingNodeKind === 235;
-                        case 58:
-                            return containingNodeKind === 232
-                                || containingNodeKind === 200;
-                        case 14:
-                            return containingNodeKind === 202;
-                        case 15:
-                            return containingNodeKind === 211;
-                        case 114:
-                        case 112:
-                        case 113:
-                            return containingNodeKind === 152;
+                        case 23 /* DotToken */:
+                            return containingNodeKind === 239 /* ModuleDeclaration */; // module A.|
+                        case 17 /* OpenBraceToken */:
+                            return containingNodeKind === 235 /* ClassDeclaration */; // class A{ |
+                        case 58 /* EqualsToken */:
+                            return containingNodeKind === 232 /* VariableDeclaration */ // const x = a|
+                                || containingNodeKind === 200 /* BinaryExpression */; // x = a|
+                        case 14 /* TemplateHead */:
+                            return containingNodeKind === 202 /* TemplateExpression */; // `aa ${|
+                        case 15 /* TemplateMiddle */:
+                            return containingNodeKind === 211 /* TemplateSpan */; // `aa ${10} dd ${|
+                        case 114 /* PublicKeyword */:
+                        case 112 /* PrivateKeyword */:
+                        case 113 /* ProtectedKeyword */:
+                            return containingNodeKind === 152 /* PropertyDeclaration */; // class A{ public |
                     }
+                    // Previous token may have been a keyword that was converted to an identifier.
                     switch (keywordForNode(previousToken)) {
-                        case 114:
-                        case 113:
-                        case 112:
+                        case 114 /* PublicKeyword */:
+                        case 113 /* ProtectedKeyword */:
+                        case 112 /* PrivateKeyword */:
                             return true;
                     }
                 }
                 return false;
             }
             function isInStringOrRegularExpressionOrTemplateLiteral(contextToken) {
+                // To be "in" one of these literals, the position has to be:
+                //   1. entirely within the token text.
+                //   2. at the end position of an unterminated token.
+                //   3. at the end of a regular expression (due to trailing flags like '/foo/g').
                 return (ts.isRegularExpressionLiteral(contextToken) || ts.isStringTextContainingNode(contextToken)) && (ts.rangeContainsPositionExclusive(ts.createTextRangeFromSpan(ts.createTextSpanFromNode(contextToken)), position) ||
                     position === contextToken.end && (!!contextToken.isUnterminated || ts.isRegularExpressionLiteral(contextToken)));
             }
+            /**
+             * Aggregates relevant symbols for completion in object literals and object binding patterns.
+             * Relevant symbols are stored in the captured 'symbols' variable.
+             *
+             * @returns true if 'symbols' was successfully populated; false otherwise.
+             */
             function tryGetObjectLikeCompletionSymbols() {
                 var objectLikeContainer = tryGetObjectLikeCompletionContainer(contextToken);
                 if (!objectLikeContainer)
-                    return 0;
-                completionKind = 0;
+                    return 0 /* Continue */;
+                // We're looking up possible property names from contextual/inferred/declared type.
+                completionKind = 0 /* ObjectPropertyDeclaration */;
                 var typeMembers;
                 var existingMembers;
-                if (objectLikeContainer.kind === 184) {
+                if (objectLikeContainer.kind === 184 /* ObjectLiteralExpression */) {
                     var typeForObject = typeChecker.getContextualType(objectLikeContainer);
                     if (!typeForObject)
-                        return 2;
+                        return 2 /* Fail */;
                     isNewIdentifierLocation = hasIndexSignature(typeForObject);
-                    typeMembers = getPropertiesForCompletion(typeForObject, typeChecker, false);
+                    typeMembers = getPropertiesForCompletion(typeForObject, typeChecker, /*isForAccess*/ false);
                     existingMembers = objectLikeContainer.properties;
                 }
                 else {
-                    ts.Debug.assert(objectLikeContainer.kind === 180);
+                    ts.Debug.assert(objectLikeContainer.kind === 180 /* ObjectBindingPattern */);
+                    // We are *only* completing on properties from the type being destructured.
                     isNewIdentifierLocation = false;
                     var rootDeclaration = ts.getRootDeclaration(objectLikeContainer.parent);
                     if (!ts.isVariableLike(rootDeclaration))
                         return ts.Debug.fail("Root declaration is not variable-like.");
-                    var canGetType = ts.hasInitializer(rootDeclaration) || ts.hasType(rootDeclaration) || rootDeclaration.parent.parent.kind === 222;
-                    if (!canGetType && rootDeclaration.kind === 149) {
+                    // We don't want to complete using the type acquired by the shape
+                    // of the binding pattern; we are only interested in types acquired
+                    // through type declaration or inference.
+                    // Also proceed if rootDeclaration is a parameter and if its containing function expression/arrow function is contextually typed -
+                    // type of parameter will flow in from the contextual type of the function
+                    var canGetType = ts.hasInitializer(rootDeclaration) || ts.hasType(rootDeclaration) || rootDeclaration.parent.parent.kind === 222 /* ForOfStatement */;
+                    if (!canGetType && rootDeclaration.kind === 149 /* Parameter */) {
                         if (ts.isExpression(rootDeclaration.parent)) {
                             canGetType = !!typeChecker.getContextualType(rootDeclaration.parent);
                         }
-                        else if (rootDeclaration.parent.kind === 154 || rootDeclaration.parent.kind === 157) {
+                        else if (rootDeclaration.parent.kind === 154 /* MethodDeclaration */ || rootDeclaration.parent.kind === 157 /* SetAccessor */) {
                             canGetType = ts.isExpression(rootDeclaration.parent.parent) && !!typeChecker.getContextualType(rootDeclaration.parent.parent);
                         }
                     }
                     if (canGetType) {
                         var typeForObject = typeChecker.getTypeAtLocation(objectLikeContainer);
                         if (!typeForObject)
-                            return 2;
-                        typeMembers = typeChecker.getPropertiesOfType(typeForObject).filter(function (symbol) { return !(ts.getDeclarationModifierFlagsFromSymbol(symbol) & 24); });
+                            return 2 /* Fail */;
+                        // In a binding pattern, get only known properties. Everywhere else we will get all possible properties.
+                        typeMembers = typeChecker.getPropertiesOfType(typeForObject).filter(function (symbol) { return !(ts.getDeclarationModifierFlagsFromSymbol(symbol) & 24 /* NonPublicAccessibilityModifier */); });
                         existingMembers = objectLikeContainer.elements;
                     }
                 }
                 if (typeMembers && typeMembers.length > 0) {
+                    // Add filtered items to the completion list
                     symbols = filterObjectMembersList(typeMembers, ts.Debug.assertDefined(existingMembers));
                 }
-                return 1;
+                return 1 /* Success */;
             }
+            /**
+             * Aggregates relevant symbols for completion in import clauses and export clauses
+             * whose declarations have a module specifier; for instance, symbols will be aggregated for
+             *
+             *      import { | } from "moduleName";
+             *      export { a as foo, | } from "moduleName";
+             *
+             * but not for
+             *
+             *      export { | };
+             *
+             * Relevant symbols are stored in the captured 'symbols' variable.
+             *
+             * @returns true if 'symbols' was successfully populated; false otherwise.
+             */
             function tryGetImportOrExportClauseCompletionSymbols() {
-                var namedImportsOrExports = contextToken && (contextToken.kind === 17 || contextToken.kind === 26)
+                // `import { |` or `import { a as 0, | }`
+                var namedImportsOrExports = contextToken && (contextToken.kind === 17 /* OpenBraceToken */ || contextToken.kind === 26 /* CommaToken */)
                     ? ts.tryCast(contextToken.parent, ts.isNamedImportsOrExports) : undefined;
                 if (!namedImportsOrExports)
-                    return 0;
-                var moduleSpecifier = (namedImportsOrExports.kind === 247 ? namedImportsOrExports.parent.parent : namedImportsOrExports.parent).moduleSpecifier;
-                var moduleSpecifierSymbol = typeChecker.getSymbolAtLocation(moduleSpecifier);
+                    return 0 /* Continue */;
+                // cursor is in an import clause
+                // try to show exported member for imported module
+                var moduleSpecifier = (namedImportsOrExports.kind === 247 /* NamedImports */ ? namedImportsOrExports.parent.parent : namedImportsOrExports.parent).moduleSpecifier;
+                var moduleSpecifierSymbol = typeChecker.getSymbolAtLocation(moduleSpecifier); // TODO: GH#18217
                 if (!moduleSpecifierSymbol)
-                    return 2;
-                completionKind = 3;
+                    return 2 /* Fail */;
+                completionKind = 3 /* MemberLike */;
                 isNewIdentifierLocation = false;
                 var exports = typeChecker.getExportsAndPropertiesOfModule(moduleSpecifierSymbol);
                 var existing = ts.arrayToSet(namedImportsOrExports.elements, function (n) { return isCurrentlyEditingNode(n) ? undefined : (n.propertyName || n.name).escapedText; });
-                symbols = exports.filter(function (e) { return e.escapedName !== "default" && !existing.get(e.escapedName); });
-                return 1;
+                symbols = exports.filter(function (e) { return e.escapedName !== "default" /* Default */ && !existing.get(e.escapedName); });
+                return 1 /* Success */;
             }
+            /**
+             * Aggregates relevant symbols for completion in class declaration
+             * Relevant symbols are stored in the captured 'symbols' variable.
+             */
             function tryGetClassLikeCompletionSymbols() {
                 var decl = tryGetObjectTypeDeclarationCompletionContainer(sourceFile, contextToken, location);
                 if (!decl)
-                    return 0;
-                completionKind = 3;
+                    return 0 /* Continue */;
+                // We're looking up possible property names from parent type.
+                completionKind = 3 /* MemberLike */;
+                // Declaring new property/method/accessor
                 isNewIdentifierLocation = true;
-                keywordFilters = ts.isClassLike(decl) ? 1 : 2;
+                keywordFilters = ts.isClassLike(decl) ? 1 /* ClassElementKeywords */ : 2 /* InterfaceElementKeywords */;
+                // If you're in an interface you don't want to repeat things from super-interface. So just stop here.
                 if (!ts.isClassLike(decl))
-                    return 1;
+                    return 1 /* Success */;
                 var classElement = contextToken.parent;
-                var classElementModifierFlags = ts.isClassElement(classElement) ? ts.getModifierFlags(classElement) : 0;
-                if (contextToken.kind === 71 && !isCurrentlyEditingNode(contextToken)) {
+                var classElementModifierFlags = ts.isClassElement(classElement) ? ts.getModifierFlags(classElement) : 0 /* None */;
+                // If this is context token is not something we are editing now, consider if this would lead to be modifier
+                if (contextToken.kind === 71 /* Identifier */ && !isCurrentlyEditingNode(contextToken)) {
                     switch (contextToken.getText()) {
                         case "private":
-                            classElementModifierFlags = classElementModifierFlags | 8;
+                            classElementModifierFlags = classElementModifierFlags | 8 /* Private */;
                             break;
                         case "static":
-                            classElementModifierFlags = classElementModifierFlags | 32;
+                            classElementModifierFlags = classElementModifierFlags | 32 /* Static */;
                             break;
                     }
                 }
-                if (!(classElementModifierFlags & 8)) {
+                // No member list for private methods
+                if (!(classElementModifierFlags & 8 /* Private */)) {
+                    // List of property symbols of base type that are not private and already implemented
                     var baseSymbols = ts.flatMap(ts.getAllSuperTypeNodes(decl), function (baseTypeNode) {
-                        var type = typeChecker.getTypeAtLocation(baseTypeNode);
-                        return typeChecker.getPropertiesOfType(classElementModifierFlags & 32 ? typeChecker.getTypeOfSymbolAtLocation(type.symbol, decl) : type);
+                        var type = typeChecker.getTypeAtLocation(baseTypeNode); // TODO: GH#18217
+                        return typeChecker.getPropertiesOfType(classElementModifierFlags & 32 /* Static */ ? typeChecker.getTypeOfSymbolAtLocation(type.symbol, decl) : type);
                     });
                     symbols = filterClassMembersList(baseSymbols, decl.members, classElementModifierFlags);
                 }
-                return 1;
+                return 1 /* Success */;
             }
+            /**
+             * Returns the immediate owning object literal or binding pattern of a context token,
+             * on the condition that one exists and that the context implies completion should be given.
+             */
             function tryGetObjectLikeCompletionContainer(contextToken) {
                 if (contextToken) {
                     switch (contextToken.kind) {
-                        case 17:
-                        case 26:
+                        case 17 /* OpenBraceToken */: // const x = { |
+                        case 26 /* CommaToken */: // const x = { a: 0, |
                             var parent = contextToken.parent;
                             if (ts.isObjectLiteralExpression(parent) || ts.isObjectBindingPattern(parent)) {
                                 return parent;
@@ -74191,12 +90863,16 @@ var ts;
                 return !!node.parent && ts.isParameter(node.parent) && ts.isConstructorDeclaration(node.parent.parent)
                     && (ts.isParameterPropertyModifier(node.kind) || ts.isDeclarationName(node));
             }
+            /**
+             * Returns the immediate owning class declaration of a context token,
+             * on the condition that one exists and that the context implies completion should be given.
+             */
             function tryGetConstructorLikeCompletionContainer(contextToken) {
                 if (contextToken) {
                     var parent = contextToken.parent;
                     switch (contextToken.kind) {
-                        case 19:
-                        case 26:
+                        case 19 /* OpenParenToken */:
+                        case 26 /* CommaToken */:
                             return ts.isConstructorDeclaration(contextToken.parent) ? contextToken.parent : undefined;
                         default:
                             if (isConstructorParameterCompletion(contextToken)) {
@@ -74226,32 +90902,52 @@ var ts;
                 if (contextToken) {
                     var parent = contextToken.parent;
                     switch (contextToken.kind) {
-                        case 28:
-                        case 41:
-                        case 71:
-                        case 185:
-                        case 263:
-                        case 262:
-                        case 264:
-                            if (parent && (parent.kind === 256 || parent.kind === 257)) {
+                        case 28 /* LessThanSlashToken */:
+                        case 41 /* SlashToken */:
+                        case 71 /* Identifier */:
+                        case 185 /* PropertyAccessExpression */:
+                        case 263 /* JsxAttributes */:
+                        case 262 /* JsxAttribute */:
+                        case 264 /* JsxSpreadAttribute */:
+                            if (parent && (parent.kind === 256 /* JsxSelfClosingElement */ || parent.kind === 257 /* JsxOpeningElement */)) {
                                 return parent;
                             }
-                            else if (parent.kind === 262) {
+                            else if (parent.kind === 262 /* JsxAttribute */) {
+                                // Currently we parse JsxOpeningLikeElement as:
+                                //      JsxOpeningLikeElement
+                                //          attributes: JsxAttributes
+                                //             properties: NodeArray<JsxAttributeLike>
                                 return parent.parent.parent;
                             }
                             break;
-                        case 9:
-                            if (parent && ((parent.kind === 262) || (parent.kind === 264))) {
+                        // The context token is the closing } or " of an attribute, which means
+                        // its parent is a JsxExpression, whose parent is a JsxAttribute,
+                        // whose parent is a JsxOpeningLikeElement
+                        case 9 /* StringLiteral */:
+                            if (parent && ((parent.kind === 262 /* JsxAttribute */) || (parent.kind === 264 /* JsxSpreadAttribute */))) {
+                                // Currently we parse JsxOpeningLikeElement as:
+                                //      JsxOpeningLikeElement
+                                //          attributes: JsxAttributes
+                                //             properties: NodeArray<JsxAttributeLike>
                                 return parent.parent.parent;
                             }
                             break;
-                        case 18:
+                        case 18 /* CloseBraceToken */:
                             if (parent &&
-                                parent.kind === 265 &&
-                                parent.parent && parent.parent.kind === 262) {
+                                parent.kind === 265 /* JsxExpression */ &&
+                                parent.parent && parent.parent.kind === 262 /* JsxAttribute */) {
+                                // Currently we parse JsxOpeningLikeElement as:
+                                //      JsxOpeningLikeElement
+                                //          attributes: JsxAttributes
+                                //             properties: NodeArray<JsxAttributeLike>
+                                //                  each JsxAttribute can have initializer as JsxExpression
                                 return parent.parent.parent.parent;
                             }
-                            if (parent && parent.kind === 264) {
+                            if (parent && parent.kind === 264 /* JsxSpreadAttribute */) {
+                                // Currently we parse JsxOpeningLikeElement as:
+                                //      JsxOpeningLikeElement
+                                //          attributes: JsxAttributes
+                                //             properties: NodeArray<JsxAttributeLike>
                                 return parent.parent.parent;
                             }
                             break;
@@ -74259,111 +90955,132 @@ var ts;
                 }
                 return undefined;
             }
+            /**
+             * @returns true if we are certain that the currently edited location must define a new location; false otherwise.
+             */
             function isSolelyIdentifierDefinitionLocation(contextToken) {
                 var parent = contextToken.parent;
                 var containingNodeKind = parent.kind;
                 switch (contextToken.kind) {
-                    case 26:
-                        return containingNodeKind === 232 ||
-                            containingNodeKind === 233 ||
-                            containingNodeKind === 214 ||
-                            containingNodeKind === 238 ||
+                    case 26 /* CommaToken */:
+                        return containingNodeKind === 232 /* VariableDeclaration */ ||
+                            containingNodeKind === 233 /* VariableDeclarationList */ ||
+                            containingNodeKind === 214 /* VariableStatement */ ||
+                            containingNodeKind === 238 /* EnumDeclaration */ || // enum a { foo, |
                             isFunctionLikeButNotConstructor(containingNodeKind) ||
-                            containingNodeKind === 236 ||
-                            containingNodeKind === 181 ||
-                            containingNodeKind === 237 ||
+                            containingNodeKind === 236 /* InterfaceDeclaration */ || // interface A<T, |
+                            containingNodeKind === 181 /* ArrayBindingPattern */ || // var [x, y|
+                            containingNodeKind === 237 /* TypeAliasDeclaration */ || // type Map, K, |
+                            // class A<T, |
+                            // var C = class D<T, |
                             (ts.isClassLike(parent) &&
                                 !!parent.typeParameters &&
                                 parent.typeParameters.end >= contextToken.pos);
-                    case 23:
-                        return containingNodeKind === 181;
-                    case 56:
-                        return containingNodeKind === 182;
-                    case 21:
-                        return containingNodeKind === 181;
-                    case 19:
-                        return containingNodeKind === 269 ||
+                    case 23 /* DotToken */:
+                        return containingNodeKind === 181 /* ArrayBindingPattern */; // var [.|
+                    case 56 /* ColonToken */:
+                        return containingNodeKind === 182 /* BindingElement */; // var {x :html|
+                    case 21 /* OpenBracketToken */:
+                        return containingNodeKind === 181 /* ArrayBindingPattern */; // var [x|
+                    case 19 /* OpenParenToken */:
+                        return containingNodeKind === 269 /* CatchClause */ ||
                             isFunctionLikeButNotConstructor(containingNodeKind);
-                    case 17:
-                        return containingNodeKind === 238;
-                    case 27:
-                        return containingNodeKind === 235 ||
-                            containingNodeKind === 205 ||
-                            containingNodeKind === 236 ||
-                            containingNodeKind === 237 ||
+                    case 17 /* OpenBraceToken */:
+                        return containingNodeKind === 238 /* EnumDeclaration */; // enum a { |
+                    case 27 /* LessThanToken */:
+                        return containingNodeKind === 235 /* ClassDeclaration */ || // class A< |
+                            containingNodeKind === 205 /* ClassExpression */ || // var C = class D< |
+                            containingNodeKind === 236 /* InterfaceDeclaration */ || // interface A< |
+                            containingNodeKind === 237 /* TypeAliasDeclaration */ || // type List< |
                             ts.isFunctionLikeKind(containingNodeKind);
-                    case 115:
-                        return containingNodeKind === 152 && !ts.isClassLike(parent.parent);
-                    case 24:
-                        return containingNodeKind === 149 ||
-                            (!!parent.parent && parent.parent.kind === 181);
-                    case 114:
-                    case 112:
-                    case 113:
-                        return containingNodeKind === 149 && !ts.isConstructorDeclaration(parent.parent);
-                    case 118:
-                        return containingNodeKind === 248 ||
-                            containingNodeKind === 252 ||
-                            containingNodeKind === 246;
-                    case 125:
-                    case 136:
+                    case 115 /* StaticKeyword */:
+                        return containingNodeKind === 152 /* PropertyDeclaration */ && !ts.isClassLike(parent.parent);
+                    case 24 /* DotDotDotToken */:
+                        return containingNodeKind === 149 /* Parameter */ ||
+                            (!!parent.parent && parent.parent.kind === 181 /* ArrayBindingPattern */); // var [...z|
+                    case 114 /* PublicKeyword */:
+                    case 112 /* PrivateKeyword */:
+                    case 113 /* ProtectedKeyword */:
+                        return containingNodeKind === 149 /* Parameter */ && !ts.isConstructorDeclaration(parent.parent);
+                    case 118 /* AsKeyword */:
+                        return containingNodeKind === 248 /* ImportSpecifier */ ||
+                            containingNodeKind === 252 /* ExportSpecifier */ ||
+                            containingNodeKind === 246 /* NamespaceImport */;
+                    case 125 /* GetKeyword */:
+                    case 136 /* SetKeyword */:
                         if (isFromObjectTypeDeclaration(contextToken)) {
                             return false;
                         }
-                    case 75:
-                    case 83:
-                    case 109:
-                    case 89:
-                    case 104:
-                    case 91:
-                    case 110:
-                    case 76:
-                    case 116:
-                    case 139:
+                    // falls through
+                    case 75 /* ClassKeyword */:
+                    case 83 /* EnumKeyword */:
+                    case 109 /* InterfaceKeyword */:
+                    case 89 /* FunctionKeyword */:
+                    case 104 /* VarKeyword */:
+                    case 91 /* ImportKeyword */:
+                    case 110 /* LetKeyword */:
+                    case 76 /* ConstKeyword */:
+                    case 116 /* YieldKeyword */:
+                    case 139 /* TypeKeyword */: // type htm|
                         return true;
                 }
+                // If the previous token is keyword correspoding to class member completion keyword
+                // there will be completion available here
                 if (isClassMemberCompletionKeyword(keywordForNode(contextToken)) && isFromObjectTypeDeclaration(contextToken)) {
                     return false;
                 }
                 if (isConstructorParameterCompletion(contextToken)) {
+                    // constructor parameter completion is available only if
+                    // - its modifier of the constructor parameter or
+                    // - its name of the parameter and not being edited
+                    // eg. constructor(a |<- this shouldnt show completion
                     if (!ts.isIdentifier(contextToken) ||
                         ts.isParameterPropertyModifier(keywordForNode(contextToken)) ||
                         isCurrentlyEditingNode(contextToken)) {
                         return false;
                     }
                 }
+                // Previous token may have been a keyword that was converted to an identifier.
                 switch (keywordForNode(contextToken)) {
-                    case 117:
-                    case 120:
-                    case 75:
-                    case 76:
-                    case 124:
-                    case 83:
-                    case 89:
-                    case 109:
-                    case 110:
-                    case 112:
-                    case 113:
-                    case 114:
-                    case 115:
-                    case 104:
-                    case 116:
+                    case 117 /* AbstractKeyword */:
+                    case 120 /* AsyncKeyword */:
+                    case 75 /* ClassKeyword */:
+                    case 76 /* ConstKeyword */:
+                    case 124 /* DeclareKeyword */:
+                    case 83 /* EnumKeyword */:
+                    case 89 /* FunctionKeyword */:
+                    case 109 /* InterfaceKeyword */:
+                    case 110 /* LetKeyword */:
+                    case 112 /* PrivateKeyword */:
+                    case 113 /* ProtectedKeyword */:
+                    case 114 /* PublicKeyword */:
+                    case 115 /* StaticKeyword */:
+                    case 104 /* VarKeyword */:
+                    case 116 /* YieldKeyword */:
                         return true;
                 }
                 return ts.isDeclarationName(contextToken)
                     && !ts.isJsxAttribute(contextToken.parent)
+                    // Don't block completions if we're in `class C /**/`, because we're *past* the end of the identifier and might want to complete `extends`.
+                    // If `contextToken !== previousToken`, this is `class C ex/**/`.
                     && !(ts.isClassLike(contextToken.parent) && (contextToken !== previousToken || position > previousToken.end));
             }
             function isFunctionLikeButNotConstructor(kind) {
-                return ts.isFunctionLikeKind(kind) && kind !== 155;
+                return ts.isFunctionLikeKind(kind) && kind !== 155 /* Constructor */;
             }
             function isDotOfNumericLiteral(contextToken) {
-                if (contextToken.kind === 8) {
+                if (contextToken.kind === 8 /* NumericLiteral */) {
                     var text = contextToken.getFullText();
                     return text.charAt(text.length - 1) === ".";
                 }
                 return false;
             }
+            /**
+             * Filters out completion suggestions for named imports or exports.
+             *
+             * @returns Symbols to be suggested in an object binding pattern or object literal expression, barring those whose declarations
+             *          do not occur at the current position and have not otherwise been typed.
+             */
             function filterObjectMembersList(contextualMemberSymbols, existingMembers) {
                 if (existingMembers.length === 0) {
                     return contextualMemberSymbols;
@@ -74371,48 +91088,63 @@ var ts;
                 var existingMemberNames = ts.createUnderscoreEscapedMap();
                 for (var _i = 0, existingMembers_1 = existingMembers; _i < existingMembers_1.length; _i++) {
                     var m = existingMembers_1[_i];
-                    if (m.kind !== 270 &&
-                        m.kind !== 271 &&
-                        m.kind !== 182 &&
-                        m.kind !== 154 &&
-                        m.kind !== 156 &&
-                        m.kind !== 157) {
+                    // Ignore omitted expressions for missing members
+                    if (m.kind !== 270 /* PropertyAssignment */ &&
+                        m.kind !== 271 /* ShorthandPropertyAssignment */ &&
+                        m.kind !== 182 /* BindingElement */ &&
+                        m.kind !== 154 /* MethodDeclaration */ &&
+                        m.kind !== 156 /* GetAccessor */ &&
+                        m.kind !== 157 /* SetAccessor */) {
                         continue;
                     }
+                    // If this is the current item we are editing right now, do not filter it out
                     if (isCurrentlyEditingNode(m)) {
                         continue;
                     }
                     var existingName = void 0;
                     if (ts.isBindingElement(m) && m.propertyName) {
-                        if (m.propertyName.kind === 71) {
+                        // include only identifiers in completion list
+                        if (m.propertyName.kind === 71 /* Identifier */) {
                             existingName = m.propertyName.escapedText;
                         }
                     }
                     else {
+                        // TODO: Account for computed property name
+                        // NOTE: if one only performs this step when m.name is an identifier,
+                        // things like '__proto__' are not filtered out.
                         var name = ts.getNameOfDeclaration(m);
                         existingName = ts.isPropertyNameLiteral(name) ? ts.getEscapedTextOfIdentifierOrLiteral(name) : undefined;
                     }
-                    existingMemberNames.set(existingName, true);
+                    existingMemberNames.set(existingName, true); // TODO: GH#18217
                 }
                 return contextualMemberSymbols.filter(function (m) { return !existingMemberNames.get(m.escapedName); });
             }
+            /**
+             * Filters out completion suggestions for class elements.
+             *
+             * @returns Symbols to be suggested in an class element depending on existing memebers and symbol flags
+             */
             function filterClassMembersList(baseSymbols, existingMembers, currentClassElementModifierFlags) {
                 var existingMemberNames = ts.createUnderscoreEscapedMap();
                 for (var _i = 0, existingMembers_2 = existingMembers; _i < existingMembers_2.length; _i++) {
                     var m = existingMembers_2[_i];
-                    if (m.kind !== 152 &&
-                        m.kind !== 154 &&
-                        m.kind !== 156 &&
-                        m.kind !== 157) {
+                    // Ignore omitted expressions for missing members
+                    if (m.kind !== 152 /* PropertyDeclaration */ &&
+                        m.kind !== 154 /* MethodDeclaration */ &&
+                        m.kind !== 156 /* GetAccessor */ &&
+                        m.kind !== 157 /* SetAccessor */) {
                         continue;
                     }
+                    // If this is the current item we are editing right now, do not filter it out
                     if (isCurrentlyEditingNode(m)) {
                         continue;
                     }
-                    if (ts.hasModifier(m, 8)) {
+                    // Dont filter member even if the name matches if it is declared private in the list
+                    if (ts.hasModifier(m, 8 /* Private */)) {
                         continue;
                     }
-                    if (ts.hasModifier(m, 32) !== !!(currentClassElementModifierFlags & 32)) {
+                    // do not filter it out if the static presence doesnt match
+                    if (ts.hasModifier(m, 32 /* Static */) !== !!(currentClassElementModifierFlags & 32 /* Static */)) {
                         continue;
                     }
                     var existingName = ts.getPropertyNameForPropertyNameNode(m.name);
@@ -74423,17 +91155,24 @@ var ts;
                 return baseSymbols.filter(function (propertySymbol) {
                     return !existingMemberNames.has(propertySymbol.escapedName) &&
                         !!propertySymbol.declarations &&
-                        !(ts.getDeclarationModifierFlagsFromSymbol(propertySymbol) & 8);
+                        !(ts.getDeclarationModifierFlagsFromSymbol(propertySymbol) & 8 /* Private */);
                 });
             }
+            /**
+             * Filters out completion suggestions from 'symbols' according to existing JSX attributes.
+             *
+             * @returns Symbols to be suggested in a JSX element, barring those whose attributes
+             *          do not occur at the current position and have not otherwise been typed.
+             */
             function filterJsxAttributes(symbols, attributes) {
                 var seenNames = ts.createUnderscoreEscapedMap();
                 for (var _i = 0, attributes_1 = attributes; _i < attributes_1.length; _i++) {
                     var attr = attributes_1[_i];
+                    // If this is the current item we are editing right now, do not filter it out
                     if (isCurrentlyEditingNode(attr)) {
                         continue;
                     }
-                    if (attr.kind === 262) {
+                    if (attr.kind === 262 /* JsxAttribute */) {
                         seenNames.set(attr.name.escapedText, true);
                     }
                 }
@@ -74446,7 +91185,10 @@ var ts;
         function getCompletionEntryDisplayNameForSymbol(symbol, target, origin, kind) {
             var name = getSymbolName(symbol, origin, target);
             if (name === undefined
-                || symbol.flags & 1536 && ts.startsWithQuote(name)
+                // If the symbol is external module, don't show it in the completion list
+                // (i.e declare module "http" { const x; } | // <= request completion here, "http" should not be there)
+                || symbol.flags & 1536 /* Module */ && ts.startsWithQuote(name)
+                // If the symbol is the internal name of an ES symbol, it is not a valid entry. Internal names for ES symbols start with "__@"
                 || ts.isKnownSymbol(symbol)) {
                 return undefined;
             }
@@ -74454,28 +91196,31 @@ var ts;
             if (ts.isIdentifierText(name, target))
                 return validIdentiferResult;
             switch (kind) {
-                case 3:
+                case 3 /* MemberLike */:
                     return undefined;
-                case 0:
+                case 0 /* ObjectPropertyDeclaration */:
+                    // TODO: GH#18169
                     return { name: JSON.stringify(name), needsConvertPropertyAccess: false };
-                case 2:
-                case 1:
-                    return name.charCodeAt(0) === 32 ? undefined : { name: name, needsConvertPropertyAccess: true };
-                case 5:
-                case 4:
+                case 2 /* PropertyAccess */:
+                case 1 /* Global */: // For a 'this.' completion it will be in a global context, but may have a non-identifier name.
+                    // Don't add a completion for a name starting with a space. See https://github.com/Microsoft/TypeScript/pull/20547
+                    return name.charCodeAt(0) === 32 /* space */ ? undefined : { name: name, needsConvertPropertyAccess: true };
+                case 5 /* None */:
+                case 4 /* String */:
                     return validIdentiferResult;
                 default:
                     ts.Debug.assertNever(kind);
             }
         }
+        // A cache of completion entries for keywords, these do not change between sessions
         var _keywordCompletions = [];
         var allKeywordsCompletions = ts.memoize(function () {
             var res = [];
-            for (var i = 72; i <= 145; i++) {
+            for (var i = 72 /* FirstKeyword */; i <= 145 /* LastKeyword */; i++) {
                 res.push({
                     name: ts.tokenToString(i),
-                    kind: "keyword",
-                    kindModifiers: "",
+                    kind: "keyword" /* keyword */,
+                    kindModifiers: "" /* none */,
                     sortText: "0"
                 });
             }
@@ -74485,17 +91230,18 @@ var ts;
             return _keywordCompletions[keywordFilter] || (_keywordCompletions[keywordFilter] = allKeywordsCompletions().filter(function (entry) {
                 var kind = ts.stringToToken(entry.name);
                 switch (keywordFilter) {
-                    case 0:
-                        return kind !== 140;
-                    case 1:
+                    case 0 /* None */:
+                        // "undefined" is a global variable, so don't need a keyword completion for it.
+                        return kind !== 140 /* UndefinedKeyword */;
+                    case 1 /* ClassElementKeywords */:
                         return isClassMemberCompletionKeyword(kind);
-                    case 2:
+                    case 2 /* InterfaceElementKeywords */:
                         return isInterfaceOrTypeLiteralCompletionKeyword(kind);
-                    case 3:
+                    case 3 /* ConstructorParameterKeywords */:
                         return ts.isParameterPropertyModifier(kind);
-                    case 4:
+                    case 4 /* FunctionLikeBodyKeywords */:
                         return !isClassMemberCompletionKeyword(kind);
-                    case 5:
+                    case 5 /* TypeKeywords */:
                         return ts.isTypeKeyword(kind);
                     default:
                         return ts.Debug.assertNever(keywordFilter);
@@ -74503,34 +91249,35 @@ var ts;
             }));
         }
         function isInterfaceOrTypeLiteralCompletionKeyword(kind) {
-            return kind === 132;
+            return kind === 132 /* ReadonlyKeyword */;
         }
         function isClassMemberCompletionKeyword(kind) {
             switch (kind) {
-                case 117:
-                case 123:
-                case 125:
-                case 136:
-                case 120:
+                case 117 /* AbstractKeyword */:
+                case 123 /* ConstructorKeyword */:
+                case 125 /* GetKeyword */:
+                case 136 /* SetKeyword */:
+                case 120 /* AsyncKeyword */:
                     return true;
                 default:
                     return ts.isClassMemberModifier(kind);
             }
         }
         function keywordForNode(node) {
-            return ts.isIdentifier(node) ? node.originalKeywordKind || 0 : node.kind;
+            return ts.isIdentifier(node) ? node.originalKeywordKind || 0 /* Unknown */ : node.kind;
         }
         function isEqualityOperatorKind(kind) {
             switch (kind) {
-                case 34:
-                case 32:
-                case 35:
-                case 33:
+                case 34 /* EqualsEqualsEqualsToken */:
+                case 32 /* EqualsEqualsToken */:
+                case 35 /* ExclamationEqualsEqualsToken */:
+                case 33 /* ExclamationEqualsToken */:
                     return true;
                 default:
                     return false;
             }
         }
+        /** Get the corresponding JSDocTag node if the position is in a jsDoc comment */
         function getJsDocTagAtPosition(node, position) {
             var jsDoc = getJsDocHavingNode(node).jsDoc;
             if (!jsDoc)
@@ -74551,52 +91298,65 @@ var ts;
             if (!ts.isToken(node))
                 return node;
             switch (node.kind) {
-                case 104:
-                case 110:
-                case 76:
+                case 104 /* VarKeyword */:
+                case 110 /* LetKeyword */:
+                case 76 /* ConstKeyword */:
+                    // if the current token is var, let or const, skip the VariableDeclarationList
                     return node.parent.parent;
                 default:
                     return node.parent;
             }
         }
+        /**
+         * Gets all properties on a type, but if that type is a union of several types,
+         * excludes array-like types or callable/constructable types.
+         */
         function getPropertiesForCompletion(type, checker, isForAccess) {
             if (!(type.isUnion())) {
                 return ts.Debug.assertEachDefined(type.getApparentProperties(), "getApparentProperties() should all be defined");
             }
+            // If we're providing completions for an object literal, skip primitive, array-like, or callable types since those shouldn't be implemented by object literals.
             var filteredTypes = isForAccess ? type.types : type.types.filter(function (memberType) {
-                return !(memberType.flags & 32764 || checker.isArrayLikeType(memberType) || ts.typeHasCallOrConstructSignatures(memberType, checker));
+                return !(memberType.flags & 32764 /* Primitive */ || checker.isArrayLikeType(memberType) || ts.typeHasCallOrConstructSignatures(memberType, checker));
             });
             return ts.Debug.assertEachDefined(checker.getAllPossiblePropertiesOfTypes(filteredTypes), "getAllPossiblePropertiesOfTypes() should all be defined");
         }
+        /**
+         * Returns the immediate owning class declaration of a context token,
+         * on the condition that one exists and that the context implies completion should be given.
+         */
         function tryGetObjectTypeDeclarationCompletionContainer(sourceFile, contextToken, location) {
+            // class c { method() { } | method2() { } }
             switch (location.kind) {
-                case 299:
+                case 299 /* SyntaxList */:
                     return ts.tryCast(location.parent, ts.isObjectTypeDeclaration);
-                case 1:
+                case 1 /* EndOfFileToken */:
                     var cls = ts.tryCast(ts.lastOrUndefined(ts.cast(location.parent, ts.isSourceFile).statements), ts.isObjectTypeDeclaration);
-                    if (cls && !ts.findChildOfKind(cls, 18, sourceFile)) {
+                    if (cls && !ts.findChildOfKind(cls, 18 /* CloseBraceToken */, sourceFile)) {
                         return cls;
                     }
             }
             if (!contextToken)
                 return undefined;
             switch (contextToken.kind) {
-                case 25:
-                case 18:
+                case 25 /* SemicolonToken */: // class c {getValue(): number; | }
+                case 18 /* CloseBraceToken */: // class c { method() { } | }
+                    // class c { method() { } b| }
                     return isFromObjectTypeDeclaration(location) && location.parent.name === location
                         ? location.parent.parent
                         : ts.tryCast(location, ts.isObjectTypeDeclaration);
-                case 17:
-                case 26:
+                case 17 /* OpenBraceToken */: // class c { |
+                case 26 /* CommaToken */: // class c {getValue(): number, | }
                     return ts.tryCast(contextToken.parent, ts.isObjectTypeDeclaration);
                 default:
                     if (!isFromObjectTypeDeclaration(contextToken))
                         return undefined;
                     var isValidKeyword = ts.isClassLike(contextToken.parent.parent) ? isClassMemberCompletionKeyword : isInterfaceOrTypeLiteralCompletionKeyword;
-                    return (isValidKeyword(contextToken.kind) || ts.isIdentifier(contextToken) && isValidKeyword(ts.stringToToken(contextToken.text)))
+                    return (isValidKeyword(contextToken.kind) || ts.isIdentifier(contextToken) && isValidKeyword(ts.stringToToken(contextToken.text))) // TODO: GH#18217
                         ? contextToken.parent.parent : undefined;
             }
         }
+        // TODO: GH#19856 Would like to return `node is Node & { parent: (ClassElement | TypeElement) & { parent: ObjectTypeDeclaration } }` but then compilation takes > 10 minutes
         function isFromObjectTypeDeclaration(node) {
             return node.parent && ts.isClassOrTypeElement(node.parent) && ts.isObjectTypeDeclaration(node.parent.parent);
         }
@@ -74611,23 +91371,25 @@ var ts;
                 case '"':
                 case "'":
                 case "`":
+                    // Only automatically bring up completions if this is an opening quote.
                     return isStringLiteralOrTemplate(contextToken) && position === contextToken.getStart(sourceFile) + 1;
                 case "<":
-                    return contextToken.kind === 27 && contextToken.parent.kind !== 200;
+                    // Opening JSX tag
+                    return contextToken.kind === 27 /* LessThanToken */ && contextToken.parent.kind !== 200 /* BinaryExpression */;
                 case "/":
                     return ts.isStringLiteralLike(contextToken)
                         ? !!ts.tryGetImportFromModuleSpecifier(contextToken)
-                        : contextToken.kind === 41 && ts.isJsxClosingElement(contextToken.parent);
+                        : contextToken.kind === 41 /* SlashToken */ && ts.isJsxClosingElement(contextToken.parent);
                 default:
                     return ts.Debug.assertNever(triggerCharacter);
             }
         }
         function isStringLiteralOrTemplate(node) {
             switch (node.kind) {
-                case 9:
-                case 13:
-                case 202:
-                case 189:
+                case 9 /* StringLiteral */:
+                case 13 /* NoSubstitutionTemplateLiteral */:
+                case 202 /* TemplateExpression */:
+                case 189 /* TaggedTemplateExpression */:
                     return true;
                 default:
                     return false;
@@ -74635,13 +91397,15 @@ var ts;
         }
     })(Completions = ts.Completions || (ts.Completions = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var DocumentHighlights;
     (function (DocumentHighlights) {
         function getDocumentHighlights(program, cancellationToken, sourceFile, position, sourceFilesToSearch) {
-            var node = ts.getTouchingPropertyName(sourceFile, position, true);
+            var node = ts.getTouchingPropertyName(sourceFile, position);
             if (node.parent && (ts.isJsxOpeningElement(node.parent) && node.parent.tagName === node || ts.isJsxClosingElement(node.parent))) {
+                // For a JSX element, just highlight the matching tag, not all references.
                 var _a = node.parent.parent, openingElement = _a.openingElement, closingElement = _a.closingElement;
                 var highlightSpans = [openingElement, closingElement].map(function (_a) {
                     var tagName = _a.tagName;
@@ -74656,12 +91420,12 @@ var ts;
             return {
                 fileName: sourceFile.fileName,
                 textSpan: ts.createTextSpanFromNode(node, sourceFile),
-                kind: "none"
+                kind: "none" /* none */
             };
         }
         function getSemanticDocumentHighlights(position, node, program, cancellationToken, sourceFilesToSearch) {
             var sourceFilesSet = ts.arrayToSet(sourceFilesToSearch, function (f) { return f.fileName; });
-            var referenceEntries = ts.FindAllReferences.getReferenceEntriesForNode(position, node, program, sourceFilesToSearch, cancellationToken, undefined, sourceFilesSet);
+            var referenceEntries = ts.FindAllReferences.getReferenceEntriesForNode(position, node, program, sourceFilesToSearch, cancellationToken, /*options*/ undefined, sourceFilesSet);
             if (!referenceEntries)
                 return undefined;
             var map = ts.arrayToMultiMap(referenceEntries.map(ts.FindAllReferences.toHighlightSpan), function (e) { return e.fileName; }, function (e) { return e.span; });
@@ -74683,40 +91447,40 @@ var ts;
         }
         function getHighlightSpans(node, sourceFile) {
             switch (node.kind) {
-                case 90:
-                case 82:
+                case 90 /* IfKeyword */:
+                case 82 /* ElseKeyword */:
                     return ts.isIfStatement(node.parent) ? getIfElseOccurrences(node.parent, sourceFile) : undefined;
-                case 96:
+                case 96 /* ReturnKeyword */:
                     return useParent(node.parent, ts.isReturnStatement, getReturnOccurrences);
-                case 100:
+                case 100 /* ThrowKeyword */:
                     return useParent(node.parent, ts.isThrowStatement, getThrowOccurrences);
-                case 102:
-                case 74:
-                case 87:
-                    var tryStatement = node.kind === 74 ? node.parent.parent : node.parent;
+                case 102 /* TryKeyword */:
+                case 74 /* CatchKeyword */:
+                case 87 /* FinallyKeyword */:
+                    var tryStatement = node.kind === 74 /* CatchKeyword */ ? node.parent.parent : node.parent;
                     return useParent(tryStatement, ts.isTryStatement, getTryCatchFinallyOccurrences);
-                case 98:
+                case 98 /* SwitchKeyword */:
                     return useParent(node.parent, ts.isSwitchStatement, getSwitchCaseDefaultOccurrences);
-                case 73:
-                case 79:
+                case 73 /* CaseKeyword */:
+                case 79 /* DefaultKeyword */:
                     return useParent(node.parent.parent.parent, ts.isSwitchStatement, getSwitchCaseDefaultOccurrences);
-                case 72:
-                case 77:
+                case 72 /* BreakKeyword */:
+                case 77 /* ContinueKeyword */:
                     return useParent(node.parent, ts.isBreakOrContinueStatement, getBreakOrContinueStatementOccurrences);
-                case 88:
-                case 106:
-                case 81:
-                    return useParent(node.parent, function (n) { return ts.isIterationStatement(n, true); }, getLoopBreakContinueOccurrences);
-                case 123:
-                    return getFromAllDeclarations(ts.isConstructorDeclaration, [123]);
-                case 125:
-                case 136:
-                    return getFromAllDeclarations(ts.isAccessor, [125, 136]);
-                case 121:
+                case 88 /* ForKeyword */:
+                case 106 /* WhileKeyword */:
+                case 81 /* DoKeyword */:
+                    return useParent(node.parent, function (n) { return ts.isIterationStatement(n, /*lookInLabeledStatements*/ true); }, getLoopBreakContinueOccurrences);
+                case 123 /* ConstructorKeyword */:
+                    return getFromAllDeclarations(ts.isConstructorDeclaration, [123 /* ConstructorKeyword */]);
+                case 125 /* GetKeyword */:
+                case 136 /* SetKeyword */:
+                    return getFromAllDeclarations(ts.isAccessor, [125 /* GetKeyword */, 136 /* SetKeyword */]);
+                case 121 /* AwaitKeyword */:
                     return useParent(node.parent, ts.isAwaitExpression, getAsyncAndAwaitOccurrences);
-                case 120:
+                case 120 /* AsyncKeyword */:
                     return highlightSpans(getAsyncAndAwaitOccurrences(node));
-                case 116:
+                case 116 /* YieldKeyword */:
                     return highlightSpans(getYieldOccurrences(node));
                 default:
                     return ts.isModifierKind(node.kind) && (ts.isDeclaration(node.parent) || ts.isVariableStatement(node.parent))
@@ -74735,22 +91499,35 @@ var ts;
                 return nodes && nodes.map(function (node) { return getHighlightSpanForNode(node, sourceFile); });
             }
         }
+        /**
+         * Aggregates all throw-statements within this node *without* crossing
+         * into function boundaries and try-blocks with catch-clauses.
+         */
         function aggregateOwnedThrowStatements(node) {
             if (ts.isThrowStatement(node)) {
                 return [node];
             }
             else if (ts.isTryStatement(node)) {
+                // Exceptions thrown within a try block lacking a catch clause are "owned" in the current context.
                 return ts.concatenate(node.catchClause ? aggregateOwnedThrowStatements(node.catchClause) : node.tryBlock && aggregateOwnedThrowStatements(node.tryBlock), node.finallyBlock && aggregateOwnedThrowStatements(node.finallyBlock));
             }
+            // Do not cross function boundaries.
             return ts.isFunctionLike(node) ? undefined : flatMapChildren(node, aggregateOwnedThrowStatements);
         }
+        /**
+         * For lack of a better name, this function takes a throw statement and returns the
+         * nearest ancestor that is a try-block (whose try statement has a catch clause),
+         * function-block, or source file.
+         */
         function getThrowStatementOwner(throwStatement) {
             var child = throwStatement;
             while (child.parent) {
                 var parent = child.parent;
-                if (ts.isFunctionBlock(parent) || parent.kind === 274) {
+                if (ts.isFunctionBlock(parent) || parent.kind === 274 /* SourceFile */) {
                     return parent;
                 }
+                // A throw-statement is only owned by a try-statement if the try-statement has
+                // a catch clause, and if the throw-statement occurs within the try block.
                 if (ts.isTryStatement(parent) && parent.tryBlock === child && parent.catchClause) {
                     return child;
                 }
@@ -74778,17 +91555,20 @@ var ts;
         function getBreakOrContinueOwner(statement) {
             return ts.findAncestor(statement, function (node) {
                 switch (node.kind) {
-                    case 227:
-                        if (statement.kind === 223) {
+                    case 227 /* SwitchStatement */:
+                        if (statement.kind === 223 /* ContinueStatement */) {
                             return false;
                         }
-                    case 220:
-                    case 221:
-                    case 222:
-                    case 219:
-                    case 218:
+                    // falls through
+                    case 220 /* ForStatement */:
+                    case 221 /* ForInStatement */:
+                    case 222 /* ForOfStatement */:
+                    case 219 /* WhileStatement */:
+                    case 218 /* DoStatement */:
                         return !statement.label || isLabeledBy(node, statement.label.escapedText);
                     default:
+                        // Don't cross function boundaries.
+                        // TODO: GH#20090
                         return ts.isFunctionLike(node) && "quit";
                 }
             });
@@ -74804,33 +91584,37 @@ var ts;
             });
         }
         function getNodesToSearchForModifier(declaration, modifierFlag) {
+            // Types of node whose children might have modifiers.
             var container = declaration.parent;
             switch (container.kind) {
-                case 240:
-                case 274:
-                case 213:
-                case 266:
-                case 267:
-                    if (modifierFlag & 128 && ts.isClassDeclaration(declaration)) {
+                case 240 /* ModuleBlock */:
+                case 274 /* SourceFile */:
+                case 213 /* Block */:
+                case 266 /* CaseClause */:
+                case 267 /* DefaultClause */:
+                    // Container is either a class declaration or the declaration is a classDeclaration
+                    if (modifierFlag & 128 /* Abstract */ && ts.isClassDeclaration(declaration)) {
                         return declaration.members.concat([declaration]);
                     }
                     else {
                         return container.statements;
                     }
-                case 155:
-                case 154:
-                case 234:
+                case 155 /* Constructor */:
+                case 154 /* MethodDeclaration */:
+                case 234 /* FunctionDeclaration */:
                     return container.parameters.concat((ts.isClassLike(container.parent) ? container.parent.members : []));
-                case 235:
-                case 205:
+                case 235 /* ClassDeclaration */:
+                case 205 /* ClassExpression */:
                     var nodes = container.members;
-                    if (modifierFlag & 28) {
+                    // If we're an accessibility modifier, we're in an instance member and should search
+                    // the constructor's parameter list for instance members as well.
+                    if (modifierFlag & 28 /* AccessibilityModifier */) {
                         var constructor = ts.find(container.members, ts.isConstructorDeclaration);
                         if (constructor) {
                             return nodes.concat(constructor.parameters);
                         }
                     }
-                    else if (modifierFlag & 128) {
+                    else if (modifierFlag & 128 /* Abstract */) {
                         return nodes.concat([container]);
                     }
                     return nodes;
@@ -74851,11 +91635,12 @@ var ts;
         }
         function getLoopBreakContinueOccurrences(loopNode) {
             var keywords = [];
-            if (pushKeywordIf(keywords, loopNode.getFirstToken(), 88, 106, 81)) {
-                if (loopNode.kind === 218) {
+            if (pushKeywordIf(keywords, loopNode.getFirstToken(), 88 /* ForKeyword */, 106 /* WhileKeyword */, 81 /* DoKeyword */)) {
+                // If we succeeded and got a do-while loop, then start looking for a 'while' keyword.
+                if (loopNode.kind === 218 /* DoStatement */) {
                     var loopTokens = loopNode.getChildren();
                     for (var i = loopTokens.length - 1; i >= 0; i--) {
-                        if (pushKeywordIf(keywords, loopTokens[i], 106)) {
+                        if (pushKeywordIf(keywords, loopTokens[i], 106 /* WhileKeyword */)) {
                             break;
                         }
                     }
@@ -74863,7 +91648,7 @@ var ts;
             }
             ts.forEach(aggregateAllBreakAndContinueStatements(loopNode.statement), function (statement) {
                 if (ownsBreakOrContinueStatement(loopNode, statement)) {
-                    pushKeywordIf(keywords, statement.getFirstToken(), 72, 77);
+                    pushKeywordIf(keywords, statement.getFirstToken(), 72 /* BreakKeyword */, 77 /* ContinueKeyword */);
                 }
             });
             return keywords;
@@ -74872,13 +91657,13 @@ var ts;
             var owner = getBreakOrContinueOwner(breakOrContinueStatement);
             if (owner) {
                 switch (owner.kind) {
-                    case 220:
-                    case 221:
-                    case 222:
-                    case 218:
-                    case 219:
+                    case 220 /* ForStatement */:
+                    case 221 /* ForInStatement */:
+                    case 222 /* ForOfStatement */:
+                    case 218 /* DoStatement */:
+                    case 219 /* WhileStatement */:
                         return getLoopBreakContinueOccurrences(owner);
-                    case 227:
+                    case 227 /* SwitchStatement */:
                         return getSwitchCaseDefaultOccurrences(owner);
                 }
             }
@@ -74886,12 +91671,13 @@ var ts;
         }
         function getSwitchCaseDefaultOccurrences(switchStatement) {
             var keywords = [];
-            pushKeywordIf(keywords, switchStatement.getFirstToken(), 98);
+            pushKeywordIf(keywords, switchStatement.getFirstToken(), 98 /* SwitchKeyword */);
+            // Go through each clause in the switch statement, collecting the 'case'/'default' keywords.
             ts.forEach(switchStatement.caseBlock.clauses, function (clause) {
-                pushKeywordIf(keywords, clause.getFirstToken(), 73, 79);
+                pushKeywordIf(keywords, clause.getFirstToken(), 73 /* CaseKeyword */, 79 /* DefaultKeyword */);
                 ts.forEach(aggregateAllBreakAndContinueStatements(clause), function (statement) {
                     if (ownsBreakOrContinueStatement(switchStatement, statement)) {
-                        pushKeywordIf(keywords, statement.getFirstToken(), 72);
+                        pushKeywordIf(keywords, statement.getFirstToken(), 72 /* BreakKeyword */);
                     }
                 });
             });
@@ -74899,13 +91685,13 @@ var ts;
         }
         function getTryCatchFinallyOccurrences(tryStatement, sourceFile) {
             var keywords = [];
-            pushKeywordIf(keywords, tryStatement.getFirstToken(), 102);
+            pushKeywordIf(keywords, tryStatement.getFirstToken(), 102 /* TryKeyword */);
             if (tryStatement.catchClause) {
-                pushKeywordIf(keywords, tryStatement.catchClause.getFirstToken(), 74);
+                pushKeywordIf(keywords, tryStatement.catchClause.getFirstToken(), 74 /* CatchKeyword */);
             }
             if (tryStatement.finallyBlock) {
-                var finallyKeyword = ts.findChildOfKind(tryStatement, 87, sourceFile);
-                pushKeywordIf(keywords, finallyKeyword, 87);
+                var finallyKeyword = ts.findChildOfKind(tryStatement, 87 /* FinallyKeyword */, sourceFile);
+                pushKeywordIf(keywords, finallyKeyword, 87 /* FinallyKeyword */);
             }
             return keywords;
         }
@@ -74916,11 +91702,13 @@ var ts;
             }
             var keywords = [];
             ts.forEach(aggregateOwnedThrowStatements(owner), function (throwStatement) {
-                keywords.push(ts.findChildOfKind(throwStatement, 100, sourceFile));
+                keywords.push(ts.findChildOfKind(throwStatement, 100 /* ThrowKeyword */, sourceFile));
             });
+            // If the "owner" is a function, then we equate 'return' and 'throw' statements in their
+            // ability to "jump out" of the function, and include occurrences for both.
             if (ts.isFunctionBlock(owner)) {
                 ts.forEachReturnStatement(owner, function (returnStatement) {
-                    keywords.push(ts.findChildOfKind(returnStatement, 96, sourceFile));
+                    keywords.push(ts.findChildOfKind(returnStatement, 96 /* ReturnKeyword */, sourceFile));
                 });
             }
             return keywords;
@@ -74932,10 +91720,11 @@ var ts;
             }
             var keywords = [];
             ts.forEachReturnStatement(ts.cast(func.body, ts.isBlock), function (returnStatement) {
-                keywords.push(ts.findChildOfKind(returnStatement, 96, sourceFile));
+                keywords.push(ts.findChildOfKind(returnStatement, 96 /* ReturnKeyword */, sourceFile));
             });
+            // Include 'throw' statements that do not occur within a try block.
             ts.forEach(aggregateOwnedThrowStatements(func.body), function (throwStatement) {
-                keywords.push(ts.findChildOfKind(throwStatement, 100, sourceFile));
+                keywords.push(ts.findChildOfKind(throwStatement, 100 /* ThrowKeyword */, sourceFile));
             });
             return keywords;
         }
@@ -74947,13 +91736,13 @@ var ts;
             var keywords = [];
             if (func.modifiers) {
                 func.modifiers.forEach(function (modifier) {
-                    pushKeywordIf(keywords, modifier, 120);
+                    pushKeywordIf(keywords, modifier, 120 /* AsyncKeyword */);
                 });
             }
             ts.forEachChild(func, function (child) {
                 traverseWithoutCrossingFunction(child, function (node) {
                     if (ts.isAwaitExpression(node)) {
-                        pushKeywordIf(keywords, node.getFirstToken(), 121);
+                        pushKeywordIf(keywords, node.getFirstToken(), 121 /* AwaitKeyword */);
                     }
                 });
             });
@@ -74968,12 +91757,13 @@ var ts;
             ts.forEachChild(func, function (child) {
                 traverseWithoutCrossingFunction(child, function (node) {
                     if (ts.isYieldExpression(node)) {
-                        pushKeywordIf(keywords, node.getFirstToken(), 116);
+                        pushKeywordIf(keywords, node.getFirstToken(), 116 /* YieldKeyword */);
                     }
                 });
             });
             return keywords;
         }
+        // Do not cross function/class/interface/module/type boundaries.
         function traverseWithoutCrossingFunction(node, cb) {
             cb(node);
             if (!ts.isFunctionLike(node) && !ts.isClassLike(node) && !ts.isInterfaceDeclaration(node) && !ts.isModuleDeclaration(node) && !ts.isTypeAliasDeclaration(node) && !ts.isTypeNode(node)) {
@@ -74983,11 +91773,14 @@ var ts;
         function getIfElseOccurrences(ifStatement, sourceFile) {
             var keywords = getIfElseKeywords(ifStatement, sourceFile);
             var result = [];
+            // We'd like to highlight else/ifs together if they are only separated by whitespace
+            // (i.e. the keywords are separated by no comments, no newlines).
             for (var i = 0; i < keywords.length; i++) {
-                if (keywords[i].kind === 82 && i < keywords.length - 1) {
+                if (keywords[i].kind === 82 /* ElseKeyword */ && i < keywords.length - 1) {
                     var elseKeyword = keywords[i];
-                    var ifKeyword = keywords[i + 1];
+                    var ifKeyword = keywords[i + 1]; // this *should* always be an 'if' keyword.
                     var shouldCombineElseAndIf = true;
+                    // Avoid recalculating getStart() by iterating backwards.
                     for (var j = ifKeyword.getStart(sourceFile) - 1; j >= elseKeyword.end; j--) {
                         if (!ts.isWhiteSpaceSingleLine(sourceFile.text.charCodeAt(j))) {
                             shouldCombineElseAndIf = false;
@@ -74998,26 +91791,30 @@ var ts;
                         result.push({
                             fileName: sourceFile.fileName,
                             textSpan: ts.createTextSpanFromBounds(elseKeyword.getStart(), ifKeyword.end),
-                            kind: "reference"
+                            kind: "reference" /* reference */
                         });
-                        i++;
+                        i++; // skip the next keyword
                         continue;
                     }
                 }
+                // Ordinary case: just highlight the keyword.
                 result.push(getHighlightSpanForNode(keywords[i], sourceFile));
             }
             return result;
         }
         function getIfElseKeywords(ifStatement, sourceFile) {
             var keywords = [];
+            // Traverse upwards through all parent if-statements linked by their else-branches.
             while (ts.isIfStatement(ifStatement.parent) && ifStatement.parent.elseStatement === ifStatement) {
                 ifStatement = ifStatement.parent;
             }
+            // Now traverse back down through the else branches, aggregating if/else keywords of if-statements.
             while (true) {
                 var children = ifStatement.getChildren(sourceFile);
-                pushKeywordIf(keywords, children[0], 90);
+                pushKeywordIf(keywords, children[0], 90 /* IfKeyword */);
+                // Generally the 'else' keyword is second-to-last, so we traverse backwards.
                 for (var i = children.length - 1; i >= 0; i--) {
-                    if (pushKeywordIf(keywords, children[i], 82)) {
+                    if (pushKeywordIf(keywords, children[i], 82 /* ElseKeyword */)) {
                         break;
                     }
                 }
@@ -75028,6 +91825,10 @@ var ts;
             }
             return keywords;
         }
+        /**
+         * Whether or not a 'node' is preceded by a label of the given string.
+         * Note: 'node' cannot be a SourceFile.
+         */
         function isLabeledBy(node, labelName) {
             return !!ts.findAncestor(node.parent, function (owner) { return !ts.isLabeledStatement(owner) ? "quit" : owner.label.escapedText === labelName; });
         }
@@ -75039,8 +91840,11 @@ var ts;
         return createDocumentRegistryInternal(useCaseSensitiveFileNames, currentDirectory);
     }
     ts.createDocumentRegistry = createDocumentRegistry;
+    /*@internal*/
     function createDocumentRegistryInternal(useCaseSensitiveFileNames, currentDirectory, externalCache) {
         if (currentDirectory === void 0) { currentDirectory = ""; }
+        // Maps from compiler setting target (ES3, ES5, etc.) to all the cached documents we have
+        // for those settings.
         var buckets = ts.createMap();
         var getCanonicalFileName = ts.createGetCanonicalFileName(!!useCaseSensitiveFileNames);
         function getKeyForCompilationSettings(settings) {
@@ -75051,7 +91855,7 @@ var ts;
             if (!bucket && createIfMissing) {
                 buckets.set(key, bucket = ts.createMap());
             }
-            return bucket;
+            return bucket; // TODO: GH#18217
         }
         function reportStats() {
             var bucketInfoArray = ts.arrayFrom(buckets.keys()).filter(function (name) { return name && name.charAt(0) === "_"; }).map(function (name) {
@@ -75077,7 +91881,7 @@ var ts;
             return acquireDocumentWithKey(fileName, path, compilationSettings, key, scriptSnapshot, version, scriptKind);
         }
         function acquireDocumentWithKey(fileName, path, compilationSettings, key, scriptSnapshot, version, scriptKind) {
-            return acquireOrUpdateDocument(fileName, path, compilationSettings, key, scriptSnapshot, version, true, scriptKind);
+            return acquireOrUpdateDocument(fileName, path, compilationSettings, key, scriptSnapshot, version, /*acquiring*/ true, scriptKind);
         }
         function updateDocument(fileName, compilationSettings, scriptSnapshot, version, scriptKind) {
             var path = ts.toPath(fileName, currentDirectory, getCanonicalFileName);
@@ -75085,12 +91889,12 @@ var ts;
             return updateDocumentWithKey(fileName, path, compilationSettings, key, scriptSnapshot, version, scriptKind);
         }
         function updateDocumentWithKey(fileName, path, compilationSettings, key, scriptSnapshot, version, scriptKind) {
-            return acquireOrUpdateDocument(fileName, path, compilationSettings, key, scriptSnapshot, version, false, scriptKind);
+            return acquireOrUpdateDocument(fileName, path, compilationSettings, key, scriptSnapshot, version, /*acquiring*/ false, scriptKind);
         }
         function acquireOrUpdateDocument(fileName, path, compilationSettings, key, scriptSnapshot, version, acquiring, scriptKind) {
-            var bucket = getBucketForCompilationSettings(key, true);
+            var bucket = getBucketForCompilationSettings(key, /*createIfMissing*/ true);
             var entry = bucket.get(path);
-            var scriptTarget = scriptKind === 6 ? 100 : compilationSettings.target;
+            var scriptTarget = scriptKind === 6 /* JSON */ ? 100 /* JSON */ : compilationSettings.target;
             if (!entry && externalCache) {
                 var sourceFile = externalCache.getDocument(key, path);
                 if (sourceFile) {
@@ -75103,7 +91907,8 @@ var ts;
                 }
             }
             if (!entry) {
-                var sourceFile = ts.createLanguageServiceSourceFile(fileName, scriptSnapshot, scriptTarget, version, false, scriptKind);
+                // Have never seen this file with these settings.  Create a new source file for it.
+                var sourceFile = ts.createLanguageServiceSourceFile(fileName, scriptSnapshot, scriptTarget, version, /*setNodeParents*/ false, scriptKind); // TODO: GH#18217
                 if (externalCache) {
                     externalCache.setDocument(key, path, sourceFile);
                 }
@@ -75114,12 +91919,20 @@ var ts;
                 bucket.set(path, entry);
             }
             else {
+                // We have an entry for this file.  However, it may be for a different version of
+                // the script snapshot.  If so, update it appropriately.  Otherwise, we can just
+                // return it as is.
                 if (entry.sourceFile.version !== version) {
-                    entry.sourceFile = ts.updateLanguageServiceSourceFile(entry.sourceFile, scriptSnapshot, version, scriptSnapshot.getChangeRange(entry.sourceFile.scriptSnapshot));
+                    entry.sourceFile = ts.updateLanguageServiceSourceFile(entry.sourceFile, scriptSnapshot, version, scriptSnapshot.getChangeRange(entry.sourceFile.scriptSnapshot)); // TODO: GH#18217
                     if (externalCache) {
                         externalCache.setDocument(key, path, entry.sourceFile);
                     }
                 }
+                // If we're acquiring, then this is the first time this LS is asking for this document.
+                // Increase our ref count so we know there's another LS using the document.  If we're
+                // not acquiring, then that means the LS is 'updating' the file instead, and that means
+                // it has already acquired the document previously.  As such, we do not need to increase
+                // the ref count.
                 if (acquiring) {
                     entry.languageServiceRefCount++;
                 }
@@ -75133,7 +91946,7 @@ var ts;
             return releaseDocumentWithKey(path, key);
         }
         function releaseDocumentWithKey(path, key) {
-            var bucket = getBucketForCompilationSettings(key, false);
+            var bucket = getBucketForCompilationSettings(key, /*createIfMissing*/ false);
             ts.Debug.assert(bucket !== undefined);
             var entry = bucket.get(path);
             entry.languageServiceRefCount--;
@@ -75163,10 +91976,13 @@ var ts;
     }
     ts.createDocumentRegistryInternal = createDocumentRegistryInternal;
 })(ts || (ts = {}));
+/* Code for finding imports of an exported symbol. Used only by FindAllReferences. */
+/* @internal */
 var ts;
 (function (ts) {
     var FindAllReferences;
     (function (FindAllReferences) {
+        /** Creates the imports map and returns an ImportTracker that uses it. Call this lazily to avoid calling `getDirectImportsMap` unnecessarily.  */
         function createImportTracker(sourceFiles, sourceFilesSet, checker, cancellationToken) {
             var allDirectImports = getDirectImportsMap(sourceFiles, checker, cancellationToken);
             return function (exportSymbol, exportInfo, isForRename) {
@@ -75186,6 +92002,7 @@ var ts;
             ImportExport[ImportExport["Import"] = 0] = "Import";
             ImportExport[ImportExport["Export"] = 1] = "Export";
         })(ImportExport = FindAllReferences.ImportExport || (FindAllReferences.ImportExport = {}));
+        /** Returns import statements that directly reference the exporting module, and a list of files that may access the module through a namespace. */
         function getImportersForExport(sourceFiles, sourceFilesSet, allDirectImports, _a, checker, cancellationToken) {
             var exportingModuleSymbol = _a.exportingModuleSymbol, exportKind = _a.exportKind;
             var markSeenDirectImport = ts.nodeSeenTracker();
@@ -75197,14 +92014,17 @@ var ts;
             return { directImports: directImports, indirectUsers: getIndirectUsers() };
             function getIndirectUsers() {
                 if (isAvailableThroughGlobal) {
+                    // It has `export as namespace`, so anything could potentially use it.
                     return sourceFiles;
                 }
+                // Module augmentations may use this module's exports without importing it.
                 for (var _i = 0, _a = exportingModuleSymbol.declarations; _i < _a.length; _i++) {
                     var decl = _a[_i];
                     if (ts.isExternalModuleAugmentation(decl) && sourceFilesSet.has(decl.getSourceFile().fileName)) {
                         addIndirectUser(decl);
                     }
                 }
+                // This may return duplicates (if there are multiple module declarations in a single source file, all importing the same thing as a namespace), but `State.markSearchedSymbol` will handle that.
                 return indirectUserDeclarations.map(ts.getSourceFileOfNode);
             }
             function handleDirectImports(exportingModuleSymbol) {
@@ -75217,33 +92037,34 @@ var ts;
                         }
                         cancellationToken.throwIfCancellationRequested();
                         switch (direct.kind) {
-                            case 187:
+                            case 187 /* CallExpression */:
                                 if (!isAvailableThroughGlobal) {
                                     var parent = direct.parent;
-                                    if (exportKind === 2 && parent.kind === 232) {
+                                    if (exportKind === 2 /* ExportEquals */ && parent.kind === 232 /* VariableDeclaration */) {
                                         var name = parent.name;
-                                        if (name.kind === 71) {
+                                        if (name.kind === 71 /* Identifier */) {
                                             directImports.push(name);
                                             break;
                                         }
                                     }
+                                    // Don't support re-exporting 'require()' calls, so just add a single indirect user.
                                     addIndirectUser(direct.getSourceFile());
                                 }
                                 break;
-                            case 71:
+                            case 71 /* Identifier */: // for 'const x = require("y");
+                                break; // TODO: GH#23879
+                            case 243 /* ImportEqualsDeclaration */:
+                                handleNamespaceImport(direct, direct.name, ts.hasModifier(direct, 1 /* Export */));
                                 break;
-                            case 243:
-                                handleNamespaceImport(direct, direct.name, ts.hasModifier(direct, 1));
-                                break;
-                            case 244:
+                            case 244 /* ImportDeclaration */:
                                 var namedBindings = direct.importClause && direct.importClause.namedBindings;
-                                if (namedBindings && namedBindings.kind === 246) {
+                                if (namedBindings && namedBindings.kind === 246 /* NamespaceImport */) {
                                     handleNamespaceImport(direct, namedBindings.name);
                                 }
                                 else if (ts.isDefaultImport(direct)) {
                                     var sourceFileLike = getSourceFileLikeForImportDeclaration(direct);
                                     if (!isAvailableThroughGlobal) {
-                                        addIndirectUser(sourceFileLike);
+                                        addIndirectUser(sourceFileLike); // Add a check for indirect uses to handle synthetic default imports
                                     }
                                     directImports.push(direct);
                                 }
@@ -75251,15 +92072,17 @@ var ts;
                                     directImports.push(direct);
                                 }
                                 break;
-                            case 250:
+                            case 250 /* ExportDeclaration */:
                                 if (!direct.exportClause) {
+                                    // This is `export * from "foo"`, so imports of this module may import the export too.
                                     handleDirectImports(getContainingModuleSymbol(direct, checker));
                                 }
                                 else {
+                                    // This is `export { foo } from "foo"` and creates an alias symbol, so recursive search will get handle re-exports.
                                     directImports.push(direct);
                                 }
                                 break;
-                            case 179:
+                            case 179 /* ImportType */:
                                 directImports.push(direct);
                                 break;
                             default:
@@ -75269,12 +92092,13 @@ var ts;
                 }
             }
             function handleNamespaceImport(importDeclaration, name, isReExport) {
-                if (exportKind === 2) {
+                if (exportKind === 2 /* ExportEquals */) {
+                    // This is a direct import, not import-as-namespace.
                     directImports.push(importDeclaration);
                 }
                 else if (!isAvailableThroughGlobal) {
                     var sourceFileLike = getSourceFileLikeForImportDeclaration(importDeclaration);
-                    ts.Debug.assert(sourceFileLike.kind === 274 || sourceFileLike.kind === 239);
+                    ts.Debug.assert(sourceFileLike.kind === 274 /* SourceFile */ || sourceFileLike.kind === 239 /* ModuleDeclaration */);
                     if (isReExport || findNamespaceReExports(sourceFileLike, name, checker)) {
                         addIndirectUsers(sourceFileLike);
                     }
@@ -75287,16 +92111,17 @@ var ts;
                 ts.Debug.assert(!isAvailableThroughGlobal);
                 var isNew = markSeenIndirectUser(sourceFileLike);
                 if (isNew) {
-                    indirectUserDeclarations.push(sourceFileLike);
+                    indirectUserDeclarations.push(sourceFileLike); // TODO: GH#18217
                 }
                 return isNew;
             }
+            /** Adds a module and all of its transitive dependencies as possible indirect users. */
             function addIndirectUsers(sourceFileLike) {
                 if (!addIndirectUser(sourceFileLike)) {
                     return;
                 }
                 var moduleSymbol = checker.getMergedSymbol(sourceFileLike.symbol);
-                ts.Debug.assert(!!(moduleSymbol.flags & 1536));
+                ts.Debug.assert(!!(moduleSymbol.flags & 1536 /* Module */));
                 var directImports = getDirectImports(moduleSymbol);
                 if (directImports) {
                     for (var _i = 0, directImports_1 = directImports; _i < directImports_1.length; _i++) {
@@ -75309,6 +92134,11 @@ var ts;
                 return allDirectImports.get(ts.getSymbolId(moduleSymbol).toString());
             }
         }
+        /**
+         * Given the set of direct imports of a module, we need to find which ones import the particular exported symbol.
+         * The returned `importSearches` will result in the entire source file being searched.
+         * But re-exports will be placed in 'singleReferences' since they cannot be locally referenced.
+         */
         function getSearchesFromDirectImports(directImports, exportSymbol, exportKind, checker, isForRename) {
             var importSearches = [];
             var singleReferences = [];
@@ -75323,31 +92153,32 @@ var ts;
             }
             return { importSearches: importSearches, singleReferences: singleReferences };
             function handleImport(decl) {
-                if (decl.kind === 243) {
+                if (decl.kind === 243 /* ImportEqualsDeclaration */) {
                     if (isExternalModuleImportEquals(decl)) {
                         handleNamespaceImportLike(decl.name);
                     }
                     return;
                 }
-                if (decl.kind === 71) {
+                if (decl.kind === 71 /* Identifier */) {
                     handleNamespaceImportLike(decl);
                     return;
                 }
-                if (decl.kind === 179) {
+                if (decl.kind === 179 /* ImportType */) {
                     if (decl.qualifier) {
                         if (ts.isIdentifier(decl.qualifier) && decl.qualifier.escapedText === ts.symbolName(exportSymbol)) {
                             singleReferences.push(decl.qualifier);
                         }
                     }
-                    else if (exportKind === 2) {
+                    else if (exportKind === 2 /* ExportEquals */) {
                         singleReferences.push(decl.argument.literal);
                     }
                     return;
                 }
-                if (decl.moduleSpecifier.kind !== 9) {
+                // Ignore if there's a grammar error
+                if (decl.moduleSpecifier.kind !== 9 /* StringLiteral */) {
                     return;
                 }
-                if (decl.kind === 250) {
+                if (decl.kind === 250 /* ExportDeclaration */) {
                     searchForNamedImport(decl.exportClause);
                     return;
                 }
@@ -75356,26 +92187,36 @@ var ts;
                     return;
                 }
                 var namedBindings = importClause.namedBindings;
-                if (namedBindings && namedBindings.kind === 246) {
+                if (namedBindings && namedBindings.kind === 246 /* NamespaceImport */) {
                     handleNamespaceImportLike(namedBindings.name);
                     return;
                 }
-                if (exportKind === 0) {
-                    searchForNamedImport(namedBindings);
+                if (exportKind === 0 /* Named */) {
+                    searchForNamedImport(namedBindings); // tslint:disable-line no-unnecessary-type-assertion (TODO: GH#18217)
                 }
                 else {
+                    // `export =` might be imported by a default import if `--allowSyntheticDefaultImports` is on, so this handles both ExportKind.Default and ExportKind.ExportEquals
                     var name = importClause.name;
+                    // If a default import has the same name as the default export, allow to rename it.
+                    // Given `import f` and `export default function f`, we will rename both, but for `import g` we will rename just that.
                     if (name && (!isForRename || name.escapedText === ts.symbolEscapedNameNoDefault(exportSymbol))) {
                         var defaultImportAlias = checker.getSymbolAtLocation(name);
                         addSearch(name, defaultImportAlias);
                     }
-                    if (exportKind === 1) {
+                    // 'default' might be accessed as a named import `{ default as foo }`.
+                    if (exportKind === 1 /* Default */) {
                         searchForNamedImport(namedBindings);
                     }
                 }
             }
+            /**
+             * `import x = require("./x") or `import * as x from "./x"`.
+             * An `export =` may be imported by this syntax, so it may be a direct import.
+             * If it's not a direct import, it will be in `indirectUsers`, so we don't have to do anything here.
+             */
             function handleNamespaceImportLike(importName) {
-                if (exportKind === 2 && (!isForRename || isNameMatch(importName.escapedText))) {
+                // Don't rename an import that already has a different name than the export.
+                if (exportKind === 2 /* ExportEquals */ && (!isForRename || isNameMatch(importName.escapedText))) {
                     addSearch(importName, checker.getSymbolAtLocation(importName));
                 }
             }
@@ -75390,23 +92231,29 @@ var ts;
                         continue;
                     }
                     if (propertyName) {
+                        // This is `import { foo as bar } from "./a"` or `export { foo as bar } from "./a"`. `foo` isn't a local in the file, so just add it as a single reference.
                         singleReferences.push(propertyName);
+                        // If renaming `{ foo as bar }`, don't touch `bar`, just `foo`.
+                        // But do rename `foo` in ` { default as foo }` if that's the original export name.
                         if (!isForRename || name.escapedText === exportSymbol.escapedName) {
+                            // Search locally for `bar`.
                             addSearch(name, checker.getSymbolAtLocation(name));
                         }
                     }
                     else {
-                        var localSymbol = element.kind === 252 && element.propertyName
-                            ? checker.getExportSpecifierLocalTargetSymbol(element)
+                        var localSymbol = element.kind === 252 /* ExportSpecifier */ && element.propertyName
+                            ? checker.getExportSpecifierLocalTargetSymbol(element) // For re-exporting under a different name, we want to get the re-exported symbol.
                             : checker.getSymbolAtLocation(name);
                         addSearch(name, localSymbol);
                     }
                 }
             }
             function isNameMatch(name) {
-                return name === exportSymbol.escapedName || exportKind !== 0 && name === "default";
+                // Use name of "default" even in `export =` case because we may have allowSyntheticDefaultImports
+                return name === exportSymbol.escapedName || exportKind !== 0 /* Named */ && name === "default" /* Default */;
             }
         }
+        /** Returns 'true' is the namespace 'name' is re-exported from this module, and 'false' if it is only used locally. */
         function findNamespaceReExports(sourceFileLike, name, checker) {
             var namespaceImportSymbol = checker.getSymbolAtLocation(name);
             return !!forEachPossibleImportOrExportStatement(sourceFileLike, function (statement) {
@@ -75420,10 +92267,10 @@ var ts;
         function findModuleReferences(program, sourceFiles, searchModuleSymbol) {
             var refs = [];
             var checker = program.getTypeChecker();
-            for (var _i = 0, sourceFiles_5 = sourceFiles; _i < sourceFiles_5.length; _i++) {
-                var referencingFile = sourceFiles_5[_i];
+            for (var _i = 0, sourceFiles_1 = sourceFiles; _i < sourceFiles_1.length; _i++) {
+                var referencingFile = sourceFiles_1[_i];
                 var searchSourceFile = searchModuleSymbol.valueDeclaration;
-                if (searchSourceFile.kind === 274) {
+                if (searchSourceFile.kind === 274 /* SourceFile */) {
                     for (var _a = 0, _b = referencingFile.referencedFiles; _a < _b.length; _a++) {
                         var ref = _b[_a];
                         if (program.getSourceFileFromReference(referencingFile, ref) === searchSourceFile) {
@@ -75448,10 +92295,11 @@ var ts;
             return refs;
         }
         FindAllReferences.findModuleReferences = findModuleReferences;
+        /** Returns a map from a module symbol Id to all import statements that directly reference the module. */
         function getDirectImportsMap(sourceFiles, checker, cancellationToken) {
             var map = ts.createMap();
-            for (var _i = 0, sourceFiles_6 = sourceFiles; _i < sourceFiles_6.length; _i++) {
-                var sourceFile = sourceFiles_6[_i];
+            for (var _i = 0, sourceFiles_2 = sourceFiles; _i < sourceFiles_2.length; _i++) {
+                var sourceFile = sourceFiles_2[_i];
                 cancellationToken.throwIfCancellationRequested();
                 forEachImport(sourceFile, function (importDecl, moduleSpecifier) {
                     var moduleSymbol = checker.getSymbolAtLocation(moduleSpecifier);
@@ -75467,11 +92315,13 @@ var ts;
             }
             return map;
         }
+        /** Iterates over all statements at the top level or in module declarations. Returns the first truthy result. */
         function forEachPossibleImportOrExportStatement(sourceFileLike, action) {
-            return ts.forEach(sourceFileLike.kind === 274 ? sourceFileLike.statements : sourceFileLike.body.statements, function (statement) {
+            return ts.forEach(sourceFileLike.kind === 274 /* SourceFile */ ? sourceFileLike.statements : sourceFileLike.body.statements, function (statement) {
                 return action(statement) || (isAmbientModuleDeclaration(statement) && ts.forEach(statement.body && statement.body.statements, action));
             });
         }
+        /** Calls `action` for each import, re-export, or require() in a file. */
         function forEachImport(sourceFile, action) {
             if (sourceFile.externalModuleIndicator || sourceFile.imports !== undefined) {
                 for (var _i = 0, _a = sourceFile.imports; _i < _a.length; _i++) {
@@ -75482,15 +92332,15 @@ var ts;
             else {
                 forEachPossibleImportOrExportStatement(sourceFile, function (statement) {
                     switch (statement.kind) {
-                        case 250:
-                        case 244: {
+                        case 250 /* ExportDeclaration */:
+                        case 244 /* ImportDeclaration */: {
                             var decl = statement;
                             if (decl.moduleSpecifier && ts.isStringLiteral(decl.moduleSpecifier)) {
                                 action(decl, decl.moduleSpecifier);
                             }
                             break;
                         }
-                        case 243: {
+                        case 243 /* ImportEqualsDeclaration */: {
                             var decl = statement;
                             if (isExternalModuleImportEquals(decl)) {
                                 action(decl, decl.moduleReference.expression);
@@ -75501,15 +92351,24 @@ var ts;
                 });
             }
         }
+        /**
+         * Given a local reference, we might notice that it's an import/export and recursively search for references of that.
+         * If at an import, look locally for the symbol it imports.
+         * If an an export, look for all imports of it.
+         * This doesn't handle export specifiers; that is done in `getReferencesAtExportSpecifier`.
+         * @param comingFromExport If we are doing a search for all exports, don't bother looking backwards for the imported symbol, since that's the reason we're here.
+         */
         function getImportOrExportSymbol(node, symbol, checker, comingFromExport) {
             return comingFromExport ? getExport() : getExport() || getImport();
             function getExport() {
                 var parent = node.parent;
                 var grandParent = parent.parent;
                 if (symbol.exportSymbol) {
-                    if (parent.kind === 185) {
+                    if (parent.kind === 185 /* PropertyAccessExpression */) {
+                        // When accessing an export of a JS module, there's no alias. The symbol will still be flagged as an export even though we're at the use.
+                        // So check that we are at the declaration.
                         return symbol.declarations.some(function (d) { return d === parent; }) && ts.isBinaryExpression(grandParent)
-                            ? getSpecialPropertyExport(grandParent, false)
+                            ? getSpecialPropertyExport(grandParent, /*useLhsSymbol*/ false)
                             : undefined;
                     }
                     else {
@@ -75518,53 +92377,59 @@ var ts;
                 }
                 else {
                     var exportNode = getExportNode(parent, node);
-                    if (exportNode && ts.hasModifier(exportNode, 1)) {
+                    if (exportNode && ts.hasModifier(exportNode, 1 /* Export */)) {
                         if (ts.isImportEqualsDeclaration(exportNode) && exportNode.moduleReference === node) {
+                            // We're at `Y` in `export import X = Y`. This is not the exported symbol, the left-hand-side is. So treat this as an import statement.
                             if (comingFromExport) {
                                 return undefined;
                             }
                             var lhsSymbol = checker.getSymbolAtLocation(exportNode.name);
-                            return { kind: 0, symbol: lhsSymbol, isNamedImport: false };
+                            return { kind: 0 /* Import */, symbol: lhsSymbol, isNamedImport: false };
                         }
                         else {
                             return exportInfo(symbol, getExportKindForDeclaration(exportNode));
                         }
                     }
+                    // If we are in `export = a;` or `export default a;`, `parent` is the export assignment.
                     else if (ts.isExportAssignment(parent)) {
                         return getExportAssignmentExport(parent);
                     }
+                    // If we are in `export = class A {};` (or `export = class A {};`) at `A`, `parent.parent` is the export assignment.
                     else if (ts.isExportAssignment(grandParent)) {
                         return getExportAssignmentExport(grandParent);
                     }
+                    // Similar for `module.exports =` and `exports.A =`.
                     else if (ts.isBinaryExpression(parent)) {
-                        return getSpecialPropertyExport(parent, true);
+                        return getSpecialPropertyExport(parent, /*useLhsSymbol*/ true);
                     }
                     else if (ts.isBinaryExpression(grandParent)) {
-                        return getSpecialPropertyExport(grandParent, true);
+                        return getSpecialPropertyExport(grandParent, /*useLhsSymbol*/ true);
                     }
                     else if (ts.isJSDocTypedefTag(parent)) {
-                        return exportInfo(symbol, 0);
+                        return exportInfo(symbol, 0 /* Named */);
                     }
                 }
                 function getExportAssignmentExport(ex) {
+                    // Get the symbol for the `export =` node; its parent is the module it's the export of.
                     var exportingModuleSymbol = ts.Debug.assertDefined(ex.symbol.parent, "Expected export symbol to have a parent");
-                    var exportKind = ex.isExportEquals ? 2 : 1;
-                    return { kind: 1, symbol: symbol, exportInfo: { exportingModuleSymbol: exportingModuleSymbol, exportKind: exportKind } };
+                    var exportKind = ex.isExportEquals ? 2 /* ExportEquals */ : 1 /* Default */;
+                    return { kind: 1 /* Export */, symbol: symbol, exportInfo: { exportingModuleSymbol: exportingModuleSymbol, exportKind: exportKind } };
                 }
                 function getSpecialPropertyExport(node, useLhsSymbol) {
                     var kind;
                     switch (ts.getSpecialPropertyAssignmentKind(node)) {
-                        case 1:
-                            kind = 0;
+                        case 1 /* ExportsProperty */:
+                            kind = 0 /* Named */;
                             break;
-                        case 2:
-                            kind = 2;
+                        case 2 /* ModuleExports */:
+                            kind = 2 /* ExportEquals */;
                             break;
                         default:
                             return undefined;
                     }
                     var sym = useLhsSymbol ? checker.getSymbolAtLocation(ts.cast(node.left, ts.isPropertyAccessExpression).name) : symbol;
-                    if (sym && !(checker.getMergedSymbol(sym.parent).flags & 1536)) {
+                    // Better detection for GH#20803
+                    if (sym && !(checker.getMergedSymbol(sym.parent).flags & 1536 /* Module */)) {
                         ts.Debug.fail("Special property assignment kind does not have a module as its parent. Assignment is " + ts.Debug.showSymbol(sym) + ", parent is " + ts.Debug.showSymbol(sym.parent));
                     }
                     return sym && exportInfo(sym, kind);
@@ -75574,48 +92439,57 @@ var ts;
                 var isImport = isNodeImport(node);
                 if (!isImport)
                     return undefined;
+                // A symbol being imported is always an alias. So get what that aliases to find the local symbol.
                 var importedSymbol = checker.getImmediateAliasedSymbol(symbol);
                 if (!importedSymbol)
                     return undefined;
+                // Search on the local symbol in the exporting module, not the exported symbol.
                 importedSymbol = skipExportSpecifierSymbol(importedSymbol, checker);
+                // Similarly, skip past the symbol for 'export ='
                 if (importedSymbol.escapedName === "export=") {
                     importedSymbol = getExportEqualsLocalSymbol(importedSymbol, checker);
                 }
+                // If the import has a different name than the export, do not continue searching.
+                // If `importedName` is undefined, do continue searching as the export is anonymous.
+                // (All imports returned from this function will be ignored anyway if we are in rename and this is a not a named export.)
                 var importedName = ts.symbolEscapedNameNoDefault(importedSymbol);
-                if (importedName === undefined || importedName === "default" || importedName === symbol.escapedName) {
-                    return __assign({ kind: 0, symbol: importedSymbol }, isImport);
+                if (importedName === undefined || importedName === "default" /* Default */ || importedName === symbol.escapedName) {
+                    return __assign({ kind: 0 /* Import */, symbol: importedSymbol }, isImport);
                 }
             }
             function exportInfo(symbol, kind) {
                 var exportInfo = getExportInfo(symbol, kind, checker);
-                return exportInfo && { kind: 1, symbol: symbol, exportInfo: exportInfo };
+                return exportInfo && { kind: 1 /* Export */, symbol: symbol, exportInfo: exportInfo };
             }
+            // Not meant for use with export specifiers or export assignment.
             function getExportKindForDeclaration(node) {
-                return ts.hasModifier(node, 512) ? 1 : 0;
+                return ts.hasModifier(node, 512 /* Default */) ? 1 /* Default */ : 0 /* Named */;
             }
         }
         FindAllReferences.getImportOrExportSymbol = getImportOrExportSymbol;
         function getExportEqualsLocalSymbol(importedSymbol, checker) {
-            if (importedSymbol.flags & 2097152) {
+            if (importedSymbol.flags & 2097152 /* Alias */) {
                 return ts.Debug.assertDefined(checker.getImmediateAliasedSymbol(importedSymbol));
             }
             var decl = importedSymbol.valueDeclaration;
-            if (ts.isExportAssignment(decl)) {
+            if (ts.isExportAssignment(decl)) { // `export = class {}`
                 return ts.Debug.assertDefined(decl.expression.symbol);
             }
-            else if (ts.isBinaryExpression(decl)) {
+            else if (ts.isBinaryExpression(decl)) { // `module.exports = class {}`
                 return ts.Debug.assertDefined(decl.right.symbol);
             }
-            else if (ts.isSourceFile(decl)) {
+            else if (ts.isSourceFile(decl)) { // json module
                 return ts.Debug.assertDefined(decl.symbol);
             }
             return ts.Debug.fail();
         }
+        // If a reference is a class expression, the exported node would be its parent.
+        // If a reference is a variable declaration, the exported node would be the variable statement.
         function getExportNode(parent, node) {
-            if (parent.kind === 232) {
+            if (parent.kind === 232 /* VariableDeclaration */) {
                 var p = parent;
                 return p.name !== node ? undefined :
-                    p.parent.kind === 269 ? undefined : p.parent.parent.kind === 214 ? p.parent.parent : undefined;
+                    p.parent.kind === 269 /* CatchClause */ ? undefined : p.parent.parent.kind === 214 /* VariableStatement */ ? p.parent.parent : undefined;
             }
             else {
                 return parent;
@@ -75624,14 +92498,15 @@ var ts;
         function isNodeImport(node) {
             var parent = node.parent;
             switch (parent.kind) {
-                case 243:
+                case 243 /* ImportEqualsDeclaration */:
                     return parent.name === node && isExternalModuleImportEquals(parent)
                         ? { isNamedImport: false }
                         : undefined;
-                case 248:
+                case 248 /* ImportSpecifier */:
+                    // For a rename import `{ foo as bar }`, don't search for the imported symbol. Just find local uses of `bar`.
                     return parent.propertyName ? undefined : { isNamedImport: true };
-                case 245:
-                case 246:
+                case 245 /* ImportClause */:
+                case 246 /* NamespaceImport */:
                     ts.Debug.assert(parent.name === node);
                     return { isNamedImport: false };
                 default:
@@ -75641,12 +92516,15 @@ var ts;
         function getExportInfo(exportSymbol, exportKind, checker) {
             var moduleSymbol = exportSymbol.parent;
             if (!moduleSymbol)
-                return undefined;
-            var exportingModuleSymbol = checker.getMergedSymbol(moduleSymbol);
+                return undefined; // This can happen if an `export` is not at the top-level (which is a compile error).
+            var exportingModuleSymbol = checker.getMergedSymbol(moduleSymbol); // Need to get merged symbol in case there's an augmentation.
+            // `export` may appear in a namespace. In that case, just rely on global search.
             return ts.isExternalModuleSymbol(exportingModuleSymbol) ? { exportingModuleSymbol: exportingModuleSymbol, exportKind: exportKind } : undefined;
         }
         FindAllReferences.getExportInfo = getExportInfo;
+        /** If at an export specifier, go to the symbol it refers to. */
         function skipExportSpecifierSymbol(symbol, checker) {
+            // For `export { foo } from './bar", there's nothing to skip, because it does not create a new alias. But `export { foo } does.
             if (symbol.declarations) {
                 for (var _i = 0, _a = symbol.declarations; _i < _a.length; _i++) {
                     var declaration = _a[_i];
@@ -75661,24 +92539,25 @@ var ts;
             return checker.getMergedSymbol(getSourceFileLikeForImportDeclaration(importer).symbol);
         }
         function getSourceFileLikeForImportDeclaration(node) {
-            if (node.kind === 187) {
+            if (node.kind === 187 /* CallExpression */) {
                 return node.getSourceFile();
             }
             var parent = node.parent;
-            if (parent.kind === 274) {
+            if (parent.kind === 274 /* SourceFile */) {
                 return parent;
             }
-            ts.Debug.assert(parent.kind === 240);
+            ts.Debug.assert(parent.kind === 240 /* ModuleBlock */);
             return ts.cast(parent.parent, isAmbientModuleDeclaration);
         }
         function isAmbientModuleDeclaration(node) {
-            return node.kind === 239 && node.name.kind === 9;
+            return node.kind === 239 /* ModuleDeclaration */ && node.name.kind === 9 /* StringLiteral */;
         }
         function isExternalModuleImportEquals(eq) {
-            return eq.moduleReference.kind === 254 && eq.moduleReference.expression.kind === 9;
+            return eq.moduleReference.kind === 254 /* ExternalModuleReference */ && eq.moduleReference.expression.kind === 9 /* StringLiteral */;
         }
     })(FindAllReferences = ts.FindAllReferences || (ts.FindAllReferences = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var FindAllReferences;
@@ -75688,11 +92567,12 @@ var ts;
         }
         FindAllReferences.nodeEntry = nodeEntry;
         function findReferencedSymbols(program, cancellationToken, sourceFiles, sourceFile, position) {
-            var node = ts.getTouchingPropertyName(sourceFile, position, true);
+            var node = ts.getTouchingPropertyName(sourceFile, position);
             var referencedSymbols = FindAllReferences.Core.getReferencedSymbolsForNode(position, node, program, sourceFiles, cancellationToken);
             var checker = program.getTypeChecker();
             return !referencedSymbols || !referencedSymbols.length ? undefined : ts.mapDefined(referencedSymbols, function (_a) {
                 var definition = _a.definition, references = _a.references;
+                // Only include referenced symbols that have a valid definition.
                 return definition && {
                     definition: checker.runWithCancellationToken(cancellationToken, function (checker) { return definitionToReferencedSymbolDefinitionInfo(definition, checker, node); }),
                     references: references.map(toReferenceEntry)
@@ -75701,32 +92581,37 @@ var ts;
         }
         FindAllReferences.findReferencedSymbols = findReferencedSymbols;
         function getImplementationsAtPosition(program, cancellationToken, sourceFiles, sourceFile, position) {
-            var node = ts.getTouchingPropertyName(sourceFile, position, false);
+            var node = ts.getTouchingPropertyName(sourceFile, position);
             var referenceEntries = getImplementationReferenceEntries(program, cancellationToken, sourceFiles, node, position);
             var checker = program.getTypeChecker();
             return ts.map(referenceEntries, function (entry) { return toImplementationLocation(entry, checker); });
         }
         FindAllReferences.getImplementationsAtPosition = getImplementationsAtPosition;
         function getImplementationReferenceEntries(program, cancellationToken, sourceFiles, node, position) {
-            if (node.kind === 274) {
+            if (node.kind === 274 /* SourceFile */) {
                 return undefined;
             }
             var checker = program.getTypeChecker();
-            if (node.parent.kind === 271) {
-                var result_5 = [];
-                FindAllReferences.Core.getReferenceEntriesForShorthandPropertyAssignment(node, checker, function (node) { return result_5.push(nodeEntry(node)); });
-                return result_5;
+            // If invoked directly on a shorthand property assignment, then return
+            // the declaration of the symbol being assigned (not the symbol being assigned to).
+            if (node.parent.kind === 271 /* ShorthandPropertyAssignment */) {
+                var result_1 = [];
+                FindAllReferences.Core.getReferenceEntriesForShorthandPropertyAssignment(node, checker, function (node) { return result_1.push(nodeEntry(node)); });
+                return result_1;
             }
-            else if (node.kind === 97 || ts.isSuperProperty(node.parent)) {
+            else if (node.kind === 97 /* SuperKeyword */ || ts.isSuperProperty(node.parent)) {
+                // References to and accesses on the super keyword only have one possible implementation, so no
+                // need to "Find all References"
                 var symbol = checker.getSymbolAtLocation(node);
                 return symbol.valueDeclaration && [nodeEntry(symbol.valueDeclaration)];
             }
             else {
+                // Perform "Find all References" and retrieve only those that are implementations
                 return getReferenceEntriesForNode(position, node, program, sourceFiles, cancellationToken, { implementations: true });
             }
         }
         function findReferencedEntries(program, cancellationToken, sourceFiles, sourceFile, position, options) {
-            var node = ts.getTouchingPropertyName(sourceFile, position, true);
+            var node = ts.getTouchingPropertyName(sourceFile, position);
             return ts.map(flattenEntries(FindAllReferences.Core.getReferencedSymbolsForNode(position, node, program, sourceFiles, cancellationToken, options)), toReferenceEntry);
         }
         FindAllReferences.findReferencedEntries = findReferencedEntries;
@@ -75745,27 +92630,27 @@ var ts;
                     case "symbol": {
                         var symbol = def.symbol;
                         var _a = getDefinitionKindAndDisplayParts(symbol, checker, originalNode), displayParts_1 = _a.displayParts, kind_1 = _a.kind;
-                        var name_3 = displayParts_1.map(function (p) { return p.text; }).join("");
-                        return { node: symbol.declarations ? ts.getNameOfDeclaration(ts.first(symbol.declarations)) || ts.first(symbol.declarations) : originalNode, name: name_3, kind: kind_1, displayParts: displayParts_1 };
+                        var name_1 = displayParts_1.map(function (p) { return p.text; }).join("");
+                        return { node: symbol.declarations ? ts.getNameOfDeclaration(ts.first(symbol.declarations)) || ts.first(symbol.declarations) : originalNode, name: name_1, kind: kind_1, displayParts: displayParts_1 };
                     }
                     case "label": {
-                        var node_3 = def.node;
-                        return { node: node_3, name: node_3.text, kind: "label", displayParts: [ts.displayPart(node_3.text, ts.SymbolDisplayPartKind.text)] };
+                        var node_1 = def.node;
+                        return { node: node_1, name: node_1.text, kind: "label" /* label */, displayParts: [ts.displayPart(node_1.text, ts.SymbolDisplayPartKind.text)] };
                     }
                     case "keyword": {
-                        var node_4 = def.node;
-                        var name_4 = ts.tokenToString(node_4.kind);
-                        return { node: node_4, name: name_4, kind: "keyword", displayParts: [{ text: name_4, kind: "keyword" }] };
+                        var node_2 = def.node;
+                        var name_2 = ts.tokenToString(node_2.kind);
+                        return { node: node_2, name: name_2, kind: "keyword" /* keyword */, displayParts: [{ text: name_2, kind: "keyword" /* keyword */ }] };
                     }
                     case "this": {
-                        var node_5 = def.node;
-                        var symbol = checker.getSymbolAtLocation(node_5);
-                        var displayParts_2 = symbol && ts.SymbolDisplay.getSymbolDisplayPartsDocumentationAndSymbolKind(checker, symbol, node_5.getSourceFile(), ts.getContainerNode(node_5), node_5).displayParts || [ts.textPart("this")];
-                        return { node: node_5, name: "this", kind: "var", displayParts: displayParts_2 };
+                        var node_3 = def.node;
+                        var symbol = checker.getSymbolAtLocation(node_3);
+                        var displayParts_2 = symbol && ts.SymbolDisplay.getSymbolDisplayPartsDocumentationAndSymbolKind(checker, symbol, node_3.getSourceFile(), ts.getContainerNode(node_3), node_3).displayParts || [ts.textPart("this")];
+                        return { node: node_3, name: "this", kind: "var" /* variableElement */, displayParts: displayParts_2 };
                     }
                     case "string": {
-                        var node_6 = def.node;
-                        return { node: node_6, name: node_6.text, kind: "var", displayParts: [ts.displayPart(ts.getTextOfNode(node_6), ts.SymbolDisplayPartKind.stringLiteral)] };
+                        var node_4 = def.node;
+                        return { node: node_4, name: node_4.text, kind: "var" /* variableElement */, displayParts: [ts.displayPart(ts.getTextOfNode(node_4), ts.SymbolDisplayPartKind.stringLiteral)] };
                     }
                     default:
                         return ts.Debug.assertNever(def);
@@ -75773,7 +92658,7 @@ var ts;
             })();
             var node = info.node, name = info.name, kind = info.kind, displayParts = info.displayParts;
             var sourceFile = node.getSourceFile();
-            return { containerKind: "", containerName: "", fileName: sourceFile.fileName, kind: kind, name: name, textSpan: getTextSpan(ts.isComputedPropertyName(node) ? node.expression : node, sourceFile), displayParts: displayParts };
+            return { containerKind: "" /* unknown */, containerName: "", fileName: sourceFile.fileName, kind: kind, name: name, textSpan: getTextSpan(ts.isComputedPropertyName(node) ? node.expression : node, sourceFile), displayParts: displayParts };
         }
         function getDefinitionKindAndDisplayParts(symbol, checker, node) {
             var meaning = FindAllReferences.Core.getIntersectingMeaningFromDeclarations(node, symbol);
@@ -75791,7 +92676,7 @@ var ts;
                 fileName: sourceFile.fileName,
                 textSpan: getTextSpan(node, sourceFile),
                 isWriteAccess: isWriteAccessForReference(node),
-                isDefinition: node.kind === 79
+                isDefinition: node.kind === 79 /* DefaultKeyword */
                     || ts.isAnyDeclarationName(node)
                     || ts.isLiteralComputedPropertyDeclarationName(node),
                 isInString: isInString,
@@ -75805,7 +92690,7 @@ var ts;
             }
             else {
                 var textSpan = entry.textSpan, fileName = entry.fileName;
-                return { textSpan: textSpan, fileName: fileName, kind: "", displayParts: [] };
+                return { textSpan: textSpan, fileName: fileName, kind: "" /* unknown */, displayParts: [] };
             }
         }
         function implementationKindDisplayParts(node, checker) {
@@ -75813,16 +92698,16 @@ var ts;
             if (symbol) {
                 return getDefinitionKindAndDisplayParts(symbol, checker, node);
             }
-            else if (node.kind === 184) {
+            else if (node.kind === 184 /* ObjectLiteralExpression */) {
                 return {
-                    kind: "interface",
-                    displayParts: [ts.punctuationPart(19), ts.textPart("object literal"), ts.punctuationPart(20)]
+                    kind: "interface" /* interfaceElement */,
+                    displayParts: [ts.punctuationPart(19 /* OpenParenToken */), ts.textPart("object literal"), ts.punctuationPart(20 /* CloseParenToken */)]
                 };
             }
-            else if (node.kind === 205) {
+            else if (node.kind === 205 /* ClassExpression */) {
                 return {
-                    kind: "local class",
-                    displayParts: [ts.punctuationPart(19), ts.textPart("anonymous local class"), ts.punctuationPart(20)]
+                    kind: "local class" /* localClassElement */,
+                    displayParts: [ts.punctuationPart(19 /* OpenParenToken */), ts.textPart("anonymous local class"), ts.punctuationPart(20 /* CloseParenToken */)]
                 };
             }
             else {
@@ -75832,14 +92717,14 @@ var ts;
         function toHighlightSpan(entry) {
             if (entry.type === "span") {
                 var fileName = entry.fileName, textSpan = entry.textSpan;
-                return { fileName: fileName, span: { textSpan: textSpan, kind: "reference" } };
+                return { fileName: fileName, span: { textSpan: textSpan, kind: "reference" /* reference */ } };
             }
             var node = entry.node, isInString = entry.isInString;
             var sourceFile = node.getSourceFile();
             var writeAccess = isWriteAccessForReference(node);
             var span = {
                 textSpan: getTextSpan(node, sourceFile),
-                kind: writeAccess ? "writtenReference" : "reference",
+                kind: writeAccess ? "writtenReference" /* writtenReference */ : "reference" /* reference */,
                 isInString: isInString
             };
             return { fileName: sourceFile.fileName, span: span };
@@ -75848,28 +92733,32 @@ var ts;
         function getTextSpan(node, sourceFile) {
             var start = node.getStart(sourceFile);
             var end = node.getEnd();
-            if (node.kind === 9) {
+            if (node.kind === 9 /* StringLiteral */) {
                 start += 1;
                 end -= 1;
             }
             return ts.createTextSpanFromBounds(start, end);
         }
+        /** A node is considered a writeAccess iff it is a name of a declaration or a target of an assignment */
         function isWriteAccessForReference(node) {
-            return node.kind === 79 || ts.isAnyDeclarationName(node) || ts.isWriteAccess(node);
+            return node.kind === 79 /* DefaultKeyword */ || ts.isAnyDeclarationName(node) || ts.isWriteAccess(node);
         }
     })(FindAllReferences = ts.FindAllReferences || (ts.FindAllReferences = {}));
 })(ts || (ts = {}));
+/** Encapsulates the core find-all-references algorithm. */
+/* @internal */
 (function (ts) {
     var FindAllReferences;
     (function (FindAllReferences) {
         var Core;
         (function (Core) {
+            /** Core find-all-references algorithm. Handles special cases before delegating to `getReferencedSymbolsForSymbol`. */
             function getReferencedSymbolsForNode(position, node, program, sourceFiles, cancellationToken, options, sourceFilesSet) {
                 if (options === void 0) { options = {}; }
                 if (sourceFilesSet === void 0) { sourceFilesSet = ts.arrayToSet(sourceFiles, function (f) { return f.fileName; }); }
                 if (ts.isSourceFile(node)) {
                     var reference = ts.GoToDefinition.getReferenceAtPosition(node, position, program);
-                    return reference && getReferencedSymbolsForModule(program, program.getTypeChecker().getMergedSymbol(reference.file.symbol), false, sourceFiles, sourceFilesSet);
+                    return reference && getReferencedSymbolsForModule(program, program.getTypeChecker().getMergedSymbol(reference.file.symbol), /*excludeImportTypeOfExportEquals*/ false, sourceFiles, sourceFilesSet);
                 }
                 if (!options.implementations) {
                     var special = getReferencedSymbolsSpecial(node, sourceFiles, cancellationToken);
@@ -75879,17 +92768,21 @@ var ts;
                 }
                 var checker = program.getTypeChecker();
                 var symbol = checker.getSymbolAtLocation(node);
+                // Could not find a symbol e.g. unknown identifier
                 if (!symbol) {
+                    // String literal might be a property (and thus have a symbol), so do this here rather than in getReferencedSymbolsSpecial.
                     return !options.implementations && ts.isStringLiteral(node) ? getReferencesForStringLiteral(node, sourceFiles, cancellationToken) : undefined;
                 }
                 var moduleReferences = ts.emptyArray;
                 var moduleSourceFile = isModuleSymbol(symbol);
                 var referencedNode = node;
                 if (moduleSourceFile) {
-                    var exportEquals = symbol.exports.get("export=");
+                    var exportEquals = symbol.exports.get("export=" /* ExportEquals */);
+                    // If !!exportEquals, we're about to add references to `import("mod")` anyway, so don't double-count them.
                     moduleReferences = getReferencedSymbolsForModule(program, symbol, !!exportEquals, sourceFiles, sourceFilesSet);
                     if (!exportEquals || !sourceFilesSet.has(moduleSourceFile.fileName))
                         return moduleReferences;
+                    // Continue to get references to 'export ='.
                     symbol = ts.skipAlias(exportEquals, checker);
                     referencedNode = undefined;
                 }
@@ -75897,7 +92790,7 @@ var ts;
             }
             Core.getReferencedSymbolsForNode = getReferencedSymbolsForNode;
             function isModuleSymbol(symbol) {
-                return symbol.flags & 1536 ? ts.find(symbol.declarations, ts.isSourceFile) : undefined;
+                return symbol.flags & 1536 /* Module */ ? ts.find(symbol.declarations, ts.isSourceFile) : undefined;
             }
             function getReferencedSymbolsForModule(program, symbol, excludeImportTypeOfExportEquals, sourceFiles, sourceFilesSet) {
                 ts.Debug.assert(!!symbol.valueDeclaration);
@@ -75910,6 +92803,7 @@ var ts;
                                 return undefined;
                             }
                         }
+                        // import("foo") with no qualifier will reference the `export =` of the module, which may be referenced anyway.
                         return { type: "node", node: reference.literal };
                     }
                     else {
@@ -75923,54 +92817,66 @@ var ts;
                 for (var _i = 0, _a = symbol.declarations; _i < _a.length; _i++) {
                     var decl = _a[_i];
                     switch (decl.kind) {
-                        case 274:
+                        case 274 /* SourceFile */:
+                            // Don't include the source file itself. (This may not be ideal behavior, but awkward to include an entire file as a reference.)
                             break;
-                        case 239:
+                        case 239 /* ModuleDeclaration */:
                             if (sourceFilesSet.has(decl.getSourceFile().fileName)) {
                                 references.push({ type: "node", node: decl.name });
                             }
                             break;
                         default:
+                            // This may be merged with something.
                             ts.Debug.fail("Expected a module symbol to be declared by a SourceFile or ModuleDeclaration.");
                     }
                 }
                 return references.length ? [{ definition: { type: "symbol", symbol: symbol }, references: references }] : ts.emptyArray;
             }
+            /** getReferencedSymbols for special node kinds. */
             function getReferencedSymbolsSpecial(node, sourceFiles, cancellationToken) {
                 if (ts.isTypeKeyword(node.kind)) {
                     return getAllReferencesForKeyword(sourceFiles, node.kind, cancellationToken);
                 }
+                // Labels
                 if (ts.isJumpStatementTarget(node)) {
                     var labelDefinition = ts.getTargetLabel(node.parent, node.text);
+                    // if we have a label definition, look within its statement for references, if not, then
+                    // the label is undefined and we have no results..
                     return labelDefinition && getLabelReferencesInNode(labelDefinition.parent, labelDefinition);
                 }
                 else if (ts.isLabelOfLabeledStatement(node)) {
+                    // it is a label definition and not a target, search within the parent labeledStatement
                     return getLabelReferencesInNode(node.parent, node);
                 }
                 if (ts.isThis(node)) {
                     return getReferencesForThisKeyword(node, sourceFiles, cancellationToken);
                 }
-                if (node.kind === 97) {
+                if (node.kind === 97 /* SuperKeyword */) {
                     return getReferencesForSuperKeyword(node);
                 }
                 return undefined;
             }
+            /** Core find-all-references algorithm for a normal symbol. */
             function getReferencedSymbolsForSymbol(symbol, node, sourceFiles, sourceFilesSet, checker, cancellationToken, options) {
                 symbol = node && skipPastExportOrImportSpecifierOrUnion(symbol, node, checker) || symbol;
-                var searchMeaning = node ? getIntersectingMeaningFromDeclarations(node, symbol) : 7;
+                // Compute the meaning from the location and the symbol it references
+                var searchMeaning = node ? getIntersectingMeaningFromDeclarations(node, symbol) : 7 /* All */;
                 var result = [];
-                var state = new State(sourceFiles, sourceFilesSet, node ? getSpecialSearchKind(node) : 0, checker, cancellationToken, searchMeaning, options, result);
-                if (node && node.kind === 79) {
+                var state = new State(sourceFiles, sourceFilesSet, node ? getSpecialSearchKind(node) : 0 /* None */, checker, cancellationToken, searchMeaning, options, result);
+                if (node && node.kind === 79 /* DefaultKeyword */) {
                     addReference(node, symbol, state);
-                    searchForImportsOfExport(node, symbol, { exportingModuleSymbol: ts.Debug.assertDefined(symbol.parent, "Expected export symbol to have a parent"), exportKind: 1 }, state);
+                    searchForImportsOfExport(node, symbol, { exportingModuleSymbol: ts.Debug.assertDefined(symbol.parent, "Expected export symbol to have a parent"), exportKind: 1 /* Default */ }, state);
                 }
                 else {
-                    var search = state.createSearch(node, symbol, undefined, { allSearchSymbols: node ? populateSearchSymbolSet(symbol, node, checker, !!options.implementations) : [symbol] });
+                    var search = state.createSearch(node, symbol, /*comingFrom*/ undefined, { allSearchSymbols: node ? populateSearchSymbolSet(symbol, node, checker, !!options.implementations) : [symbol] });
+                    // Try to get the smallest valid scope that we can limit our search to;
+                    // otherwise we'll need to search globally (i.e. include each file).
                     var scope = getSymbolScope(symbol);
                     if (scope) {
-                        getReferencesInContainer(scope, scope.getSourceFile(), search, state, !(ts.isSourceFile(scope) && !ts.contains(sourceFiles, scope)));
+                        getReferencesInContainer(scope, scope.getSourceFile(), search, state, /*addReferencesHere*/ !(ts.isSourceFile(scope) && !ts.contains(sourceFiles, scope)));
                     }
                     else {
+                        // Global search
                         for (var _i = 0, _a = state.sourceFiles; _i < _a.length; _i++) {
                             var sourceFile = _a[_i];
                             state.cancellationToken.throwIfCancellationRequested();
@@ -75982,27 +92888,32 @@ var ts;
             }
             function getSpecialSearchKind(node) {
                 switch (node.kind) {
-                    case 123:
-                        return 1;
-                    case 71:
+                    case 123 /* ConstructorKeyword */:
+                        return 1 /* Constructor */;
+                    case 71 /* Identifier */:
                         if (ts.isClassLike(node.parent)) {
                             ts.Debug.assert(node.parent.name === node);
-                            return 2;
+                            return 2 /* Class */;
                         }
+                    // falls through
                     default:
-                        return 0;
+                        return 0 /* None */;
                 }
             }
+            /** Handle a few special cases relating to export/import specifiers. */
             function skipPastExportOrImportSpecifierOrUnion(symbol, node, checker) {
                 var parent = node.parent;
                 if (ts.isExportSpecifier(parent)) {
                     return getLocalSymbolForExportSpecifier(node, symbol, parent, checker);
                 }
                 if (ts.isImportSpecifier(parent) && parent.propertyName === node) {
+                    // We're at `foo` in `import { foo as bar }`. Probably intended to find all refs on the original, not just on the import.
                     return checker.getImmediateAliasedSymbol(symbol);
                 }
+                // If the symbol is declared as part of a declaration like `{ type: "a" } | { type: "b" }`, use the property on the union type to get more references.
                 return ts.firstDefined(symbol.declarations, function (decl) {
                     if (!decl.parent) {
+                        // Assertions for GH#21814. We should be handling SourceFile symbols in `getReferencedSymbolsForModule` instead of getting here.
                         ts.Debug.fail("Unexpected symbol at " + ts.Debug.showSyntaxKind(node) + ": " + ts.Debug.showSymbol(symbol));
                     }
                     return ts.isTypeLiteralNode(decl.parent) && ts.isUnionTypeNode(decl.parent.parent)
@@ -76016,8 +92927,14 @@ var ts;
                 SpecialSearchKind[SpecialSearchKind["Constructor"] = 1] = "Constructor";
                 SpecialSearchKind[SpecialSearchKind["Class"] = 2] = "Class";
             })(SpecialSearchKind || (SpecialSearchKind = {}));
-            var State = (function () {
-                function State(sourceFiles, sourceFilesSet, specialSearchKind, checker, cancellationToken, searchMeaning, options, result) {
+            /**
+             * Holds all state needed for the finding references.
+             * Unlike `Search`, there is only one `State`.
+             */
+            var State = /** @class */ (function () {
+                function State(sourceFiles, sourceFilesSet, 
+                /** True if we're searching for constructor references. */
+                specialSearchKind, checker, cancellationToken, searchMeaning, options, result) {
                     this.sourceFiles = sourceFiles;
                     this.sourceFilesSet = sourceFilesSet;
                     this.specialSearchKind = specialSearchKind;
@@ -76026,27 +92943,57 @@ var ts;
                     this.searchMeaning = searchMeaning;
                     this.options = options;
                     this.result = result;
+                    /** Cache for `explicitlyinheritsFrom`. */
                     this.inheritsFromCache = ts.createMap();
+                    /**
+                     * Type nodes can contain multiple references to the same type. For example:
+                     *      let x: Foo & (Foo & Bar) = ...
+                     * Because we are returning the implementation locations and not the identifier locations,
+                     * duplicate entries would be returned here as each of the type references is part of
+                     * the same implementation. For that reason, check before we add a new entry.
+                     */
                     this.markSeenContainingTypeReference = ts.nodeSeenTracker();
+                    /**
+                     * It's possible that we will encounter the right side of `export { foo as bar } from "x";` more than once.
+                     * For example:
+                     *     // b.ts
+                     *     export { foo as bar } from "./a";
+                     *     import { bar } from "./b";
+                     *
+                     * Normally at `foo as bar` we directly add `foo` and do not locally search for it (since it doesn't declare a local).
+                     * But another reference to it may appear in the same source file.
+                     * See `tests/cases/fourslash/transitiveExportImports3.ts`.
+                     */
                     this.markSeenReExportRHS = ts.nodeSeenTracker();
                     this.symbolIdToReferences = [];
+                    // Source file ID → symbol ID → Whether the symbol has been searched for in the source file.
                     this.sourceFileToSeenSymbols = [];
                 }
                 State.prototype.includesSourceFile = function (sourceFile) {
                     return this.sourceFilesSet.has(sourceFile.fileName);
                 };
+                /** Gets every place to look for references of an exported symbols. See `ImportsResult` in `importTracker.ts` for more documentation. */
                 State.prototype.getImportSearches = function (exportSymbol, exportInfo) {
                     if (!this.importTracker)
                         this.importTracker = FindAllReferences.createImportTracker(this.sourceFiles, this.sourceFilesSet, this.checker, this.cancellationToken);
                     return this.importTracker(exportSymbol, exportInfo, !!this.options.isForRename);
                 };
+                /** @param allSearchSymbols set of additinal symbols for use by `includes`. */
                 State.prototype.createSearch = function (location, symbol, comingFrom, searchOptions) {
                     if (searchOptions === void 0) { searchOptions = {}; }
+                    // Note: if this is an external module symbol, the name doesn't include quotes.
+                    // Note: getLocalSymbolForExportDefault handles `export default class C {}`, but not `export default C` or `export { C as default }`.
+                    // The other two forms seem to be handled downstream (e.g. in `skipPastExportOrImportSpecifier`), so special-casing the first form
+                    // here appears to be intentional).
                     var _a = searchOptions.text, text = _a === void 0 ? ts.stripQuotes(ts.unescapeLeadingUnderscores((ts.getLocalSymbolForExportDefault(symbol) || symbol).escapedName)) : _a, _b = searchOptions.allSearchSymbols, allSearchSymbols = _b === void 0 ? [symbol] : _b;
                     var escapedText = ts.escapeLeadingUnderscores(text);
                     var parents = this.options.implementations && location ? getParentSymbolsOfPropertyAccess(location, symbol, this.checker) : undefined;
                     return { symbol: symbol, comingFrom: comingFrom, text: text, escapedText: escapedText, parents: parents, allSearchSymbols: allSearchSymbols, includes: function (sym) { return ts.contains(allSearchSymbols, sym); } };
                 };
+                /**
+                 * Callback to add references for a particular searched symbol.
+                 * This initializes a reference group, so only call this if you will add at least one reference.
+                 */
                 State.prototype.referenceAdder = function (searchSymbol) {
                     var symbolId = ts.getSymbolId(searchSymbol);
                     var references = this.symbolIdToReferences[symbolId];
@@ -76056,26 +93003,30 @@ var ts;
                     }
                     return function (node) { return references.push(FindAllReferences.nodeEntry(node)); };
                 };
+                /** Add a reference with no associated definition. */
                 State.prototype.addStringOrCommentReference = function (fileName, textSpan) {
                     this.result.push({
                         definition: undefined,
                         references: [{ type: "span", fileName: fileName, textSpan: textSpan }]
                     });
                 };
+                /** Returns `true` the first time we search for a symbol in a file and `false` afterwards. */
                 State.prototype.markSearchedSymbols = function (sourceFile, symbols) {
                     var sourceId = ts.getNodeId(sourceFile);
                     var seenSymbols = this.sourceFileToSeenSymbols[sourceId] || (this.sourceFileToSeenSymbols[sourceId] = ts.createMap());
                     var anyNewSymbols = false;
-                    for (var _i = 0, symbols_5 = symbols; _i < symbols_5.length; _i++) {
-                        var sym = symbols_5[_i];
+                    for (var _i = 0, symbols_2 = symbols; _i < symbols_2.length; _i++) {
+                        var sym = symbols_2[_i];
                         anyNewSymbols = ts.addToSeen(seenSymbols, ts.getSymbolId(sym)) || anyNewSymbols;
                     }
                     return anyNewSymbols;
                 };
                 return State;
             }());
+            /** Search for all imports of a given exported symbol using `State.getImportSearches`. */
             function searchForImportsOfExport(exportLocation, exportSymbol, exportInfo, state) {
                 var _a = state.getImportSearches(exportSymbol, exportInfo), importSearches = _a.importSearches, singleReferences = _a.singleReferences, indirectUsers = _a.indirectUsers;
+                // For `import { foo as bar }` just add the reference to `foo`, and don't otherwise search in the file.
                 if (singleReferences.length) {
                     var addRef = state.referenceAdder(exportSymbol);
                     for (var _i = 0, singleReferences_1 = singleReferences; _i < singleReferences_1.length; _i++) {
@@ -76084,20 +93035,22 @@ var ts;
                             addRef(singleRef);
                     }
                 }
+                // For each import, find all references to that import in its source file.
                 for (var _b = 0, importSearches_1 = importSearches; _b < importSearches_1.length; _b++) {
                     var _c = importSearches_1[_b], importLocation = _c[0], importSymbol = _c[1];
-                    getReferencesInSourceFile(importLocation.getSourceFile(), state.createSearch(importLocation, importSymbol, 1), state);
+                    getReferencesInSourceFile(importLocation.getSourceFile(), state.createSearch(importLocation, importSymbol, 1 /* Export */), state);
                 }
                 if (indirectUsers.length) {
                     var indirectSearch = void 0;
                     switch (exportInfo.exportKind) {
-                        case 0:
-                            indirectSearch = state.createSearch(exportLocation, exportSymbol, 1);
+                        case 0 /* Named */:
+                            indirectSearch = state.createSearch(exportLocation, exportSymbol, 1 /* Export */);
                             break;
-                        case 1:
-                            indirectSearch = state.options.isForRename ? undefined : state.createSearch(exportLocation, exportSymbol, 1, { text: "default" });
+                        case 1 /* Default */:
+                            // Search for a property access to '.default'. This can't be renamed.
+                            indirectSearch = state.options.isForRename ? undefined : state.createSearch(exportLocation, exportSymbol, 1 /* Export */, { text: "default" });
                             break;
-                        case 2:
+                        case 2 /* ExportEquals */:
                             break;
                     }
                     if (indirectSearch) {
@@ -76113,17 +93066,22 @@ var ts;
                     return false;
                 if (!state.options.isForRename)
                     return true;
+                // Don't rename an import type `import("./module-name")` when renaming `name` in `export = name;`
                 if (!ts.isIdentifier(singleRef))
                     return false;
-                return !((ts.isExportSpecifier(singleRef.parent) || ts.isImportSpecifier(singleRef.parent)) && singleRef.escapedText === "default");
+                // At `default` in `import { default as x }` or `export { default as x }`, do add a reference, but do not rename.
+                return !((ts.isExportSpecifier(singleRef.parent) || ts.isImportSpecifier(singleRef.parent)) && singleRef.escapedText === "default" /* Default */);
             }
+            // Go to the symbol we imported from and find references for it.
             function searchForImportedSymbol(symbol, state) {
                 for (var _i = 0, _a = symbol.declarations; _i < _a.length; _i++) {
                     var declaration = _a[_i];
                     var exportingFile = declaration.getSourceFile();
-                    getReferencesInSourceFile(exportingFile, state.createSearch(declaration, symbol, 0), state, state.includesSourceFile(exportingFile));
+                    // Need to search in the file even if it's not in the search-file set, because it might export the symbol.
+                    getReferencesInSourceFile(exportingFile, state.createSearch(declaration, symbol, 0 /* Import */), state, state.includesSourceFile(exportingFile));
                 }
             }
+            /** Search for all occurences of an identifier in a source file (and filter out the ones that match). */
             function searchForName(sourceFile, search, state) {
                 if (ts.getNameTable(sourceFile).get(search.escapedText) !== undefined) {
                     getReferencesInSourceFile(sourceFile, search, state);
@@ -76135,9 +93093,9 @@ var ts;
                     : undefined;
             }
             function getObjectBindingElementWithoutPropertyName(symbol) {
-                var bindingElement = ts.getDeclarationOfKind(symbol, 182);
+                var bindingElement = ts.getDeclarationOfKind(symbol, 182 /* BindingElement */);
                 if (bindingElement &&
-                    bindingElement.parent.kind === 180 &&
+                    bindingElement.parent.kind === 180 /* ObjectBindingPattern */ &&
                     ts.isIdentifier(bindingElement.name) &&
                     !bindingElement.propertyName) {
                     return bindingElement;
@@ -76147,42 +93105,73 @@ var ts;
                 var bindingElement = getObjectBindingElementWithoutPropertyName(symbol);
                 return bindingElement && ts.getPropertySymbolFromBindingElement(checker, bindingElement);
             }
+            /**
+             * Determines the smallest scope in which a symbol may have named references.
+             * Note that not every construct has been accounted for. This function can
+             * probably be improved.
+             *
+             * @returns undefined if the scope cannot be determined, implying that
+             * a reference to a symbol can occur anywhere.
+             */
             function getSymbolScope(symbol) {
+                // If this is the symbol of a named function expression or named class expression,
+                // then named references are limited to its own scope.
                 var declarations = symbol.declarations, flags = symbol.flags, parent = symbol.parent, valueDeclaration = symbol.valueDeclaration;
-                if (valueDeclaration && (valueDeclaration.kind === 192 || valueDeclaration.kind === 205)) {
+                if (valueDeclaration && (valueDeclaration.kind === 192 /* FunctionExpression */ || valueDeclaration.kind === 205 /* ClassExpression */)) {
                     return valueDeclaration;
                 }
                 if (!declarations) {
                     return undefined;
                 }
-                if (flags & (4 | 8192)) {
-                    var privateDeclaration = ts.find(declarations, function (d) { return ts.hasModifier(d, 8); });
+                // If this is private property or method, the scope is the containing class
+                if (flags & (4 /* Property */ | 8192 /* Method */)) {
+                    var privateDeclaration = ts.find(declarations, function (d) { return ts.hasModifier(d, 8 /* Private */); });
                     if (privateDeclaration) {
-                        return ts.getAncestor(privateDeclaration, 235);
+                        return ts.getAncestor(privateDeclaration, 235 /* ClassDeclaration */);
                     }
+                    // Else this is a public property and could be accessed from anywhere.
                     return undefined;
                 }
+                // If symbol is of object binding pattern element without property name we would want to
+                // look for property too and that could be anywhere
                 if (getObjectBindingElementWithoutPropertyName(symbol)) {
                     return undefined;
                 }
-                var exposedByParent = parent && !(symbol.flags & 262144);
-                if (exposedByParent && !((parent.flags & 1536) && ts.isExternalModuleSymbol(parent) && !parent.globalExports)) {
+                /*
+                If the symbol has a parent, it's globally visible unless:
+                - It's a private property (handled above).
+                - It's a type parameter.
+                - The parent is an external module: then we should only search in the module (and recurse on the export later).
+                  - But if the parent has `export as namespace`, the symbol is globally visible through that namespace.
+                */
+                var exposedByParent = parent && !(symbol.flags & 262144 /* TypeParameter */);
+                if (exposedByParent && !((parent.flags & 1536 /* Module */) && ts.isExternalModuleSymbol(parent) && !parent.globalExports)) {
                     return undefined;
                 }
                 var scope;
-                for (var _i = 0, declarations_10 = declarations; _i < declarations_10.length; _i++) {
-                    var declaration = declarations_10[_i];
+                for (var _i = 0, declarations_1 = declarations; _i < declarations_1.length; _i++) {
+                    var declaration = declarations_1[_i];
                     var container = ts.getContainerNode(declaration);
                     if (scope && scope !== container) {
+                        // Different declarations have different containers, bail out
                         return undefined;
                     }
-                    if (!container || container.kind === 274 && !ts.isExternalOrCommonJsModule(container)) {
+                    if (!container || container.kind === 274 /* SourceFile */ && !ts.isExternalOrCommonJsModule(container)) {
+                        // This is a global variable and not an external module, any declaration defined
+                        // within this scope is visible outside the file
                         return undefined;
                     }
+                    // The search scope is the container node
                     scope = container;
                 }
-                return exposedByParent ? scope.getSourceFile() : scope;
+                // If symbol.parent, this means we are in an export of an external module. (Otherwise we would have returned `undefined` above.)
+                // For an export of a module, we may be in a declaration file, and it may be accessed elsewhere. E.g.:
+                //     declare module "a" { export type T = number; }
+                //     declare module "b" { import { T } from "a"; export const x: T; }
+                // So we must search the whole source file. (Because we will mark the source file as seen, we we won't return to it when searching for imports.)
+                return exposedByParent ? scope.getSourceFile() : scope; // TODO: GH#18217
             }
+            /** Used as a quick check for whether a symbol is used at all in a file (besides its definition). */
             function isSymbolReferencedInFile(definition, checker, sourceFile) {
                 return eachSymbolReferenceInFile(definition, checker, sourceFile, function () { return true; }) || false;
             }
@@ -76195,7 +93184,7 @@ var ts;
                     var token = _a[_i];
                     if (!ts.isIdentifier(token) || token === definition || token.escapedText !== definition.escapedText)
                         continue;
-                    var referenceSymbol = checker.getSymbolAtLocation(token);
+                    var referenceSymbol = checker.getSymbolAtLocation(token); // See GH#19955 for why the type annotation is necessary
                     if (referenceSymbol === symbol
                         || checker.getShorthandAssignmentValueSymbol(token.parent) === symbol
                         || ts.isExportSpecifier(token.parent) && getLocalSymbolForExportSpecifier(token, referenceSymbol, token.parent, checker) === symbol) {
@@ -76208,11 +93197,14 @@ var ts;
             Core.eachSymbolReferenceInFile = eachSymbolReferenceInFile;
             function getPossibleSymbolReferenceNodes(sourceFile, symbolName, container) {
                 if (container === void 0) { container = sourceFile; }
-                return getPossibleSymbolReferencePositions(sourceFile, symbolName, container).map(function (pos) { return ts.getTouchingPropertyName(sourceFile, pos, true); });
+                return getPossibleSymbolReferencePositions(sourceFile, symbolName, container).map(function (pos) { return ts.getTouchingPropertyName(sourceFile, pos); });
             }
             function getPossibleSymbolReferencePositions(sourceFile, symbolName, container) {
                 if (container === void 0) { container = sourceFile; }
                 var positions = [];
+                /// TODO: Cache symbol existence for files to save text search
+                // Also, need to make this work for unicode escapes.
+                // Be resilient in the face of a symbol with no name or zero length name
                 if (!symbolName || !symbolName.length) {
                     return positions;
                 }
@@ -76221,11 +93213,15 @@ var ts;
                 var symbolNameLength = symbolName.length;
                 var position = text.indexOf(symbolName, container.pos);
                 while (position >= 0) {
+                    // If we are past the end, stop looking
                     if (position > container.end)
                         break;
+                    // We found a match.  Make sure it's not part of a larger word (i.e. the char
+                    // before and after it have to be a non-identifier char).
                     var endPosition = position + symbolNameLength;
-                    if ((position === 0 || !ts.isIdentifierPart(text.charCodeAt(position - 1), 6)) &&
-                        (endPosition === sourceLength || !ts.isIdentifierPart(text.charCodeAt(endPosition), 6))) {
+                    if ((position === 0 || !ts.isIdentifierPart(text.charCodeAt(position - 1), 6 /* Latest */)) &&
+                        (endPosition === sourceLength || !ts.isIdentifierPart(text.charCodeAt(endPosition), 6 /* Latest */))) {
+                        // Found a real match.  Keep searching.
                         positions.push(position);
                     }
                     position = text.indexOf(symbolName, position + symbolNameLength + 1);
@@ -76236,22 +93232,24 @@ var ts;
                 var sourceFile = container.getSourceFile();
                 var labelName = targetLabel.text;
                 var references = ts.mapDefined(getPossibleSymbolReferenceNodes(sourceFile, labelName, container), function (node) {
+                    // Only pick labels that are either the target label, or have a target that is the target label
                     return node === targetLabel || (ts.isJumpStatementTarget(node) && ts.getTargetLabel(node, labelName) === targetLabel) ? FindAllReferences.nodeEntry(node) : undefined;
                 });
                 return [{ definition: { type: "label", node: targetLabel }, references: references }];
             }
             function isValidReferencePosition(node, searchSymbolName) {
+                // Compare the length so we filter out strict superstrings of the symbol we are looking for
                 switch (node.kind) {
-                    case 71:
+                    case 71 /* Identifier */:
                         return node.text.length === searchSymbolName.length;
-                    case 9: {
+                    case 9 /* StringLiteral */: {
                         var str = node;
                         return (ts.isLiteralNameOfPropertyDeclarationOrIndexAccess(str) || ts.isNameOfModuleDeclaration(node) || ts.isExpressionOfExternalModuleImportEqualsDeclaration(node)) &&
                             str.text.length === searchSymbolName.length;
                     }
-                    case 8:
+                    case 8 /* NumericLiteral */:
                         return ts.isLiteralNameOfPropertyDeclarationOrIndexAccess(node) && node.text.length === searchSymbolName.length;
-                    case 79:
+                    case 79 /* DefaultKeyword */:
                         return "default".length === searchSymbolName.length;
                     default:
                         return false;
@@ -76271,6 +93269,11 @@ var ts;
                 state.cancellationToken.throwIfCancellationRequested();
                 return getReferencesInContainer(sourceFile, sourceFile, search, state, addReferencesHere);
             }
+            /**
+             * Search within node "container" for references for a search value, where the search value is defined as a
+             * tuple of(searchSymbol, searchText, searchLocation, and searchMeaning).
+             * searchLocation: a node where the search value
+             */
             function getReferencesInContainer(container, sourceFile, search, state, addReferencesHere) {
                 if (!state.markSearchedSymbols(sourceFile, search.allSearchSymbols)) {
                     return;
@@ -76284,9 +93287,16 @@ var ts;
                 return !!(ts.getMeaningFromLocation(referenceLocation) & state.searchMeaning);
             }
             function getReferencesAtLocation(sourceFile, position, search, state, addReferencesHere) {
-                var referenceLocation = ts.getTouchingPropertyName(sourceFile, position, true);
+                var referenceLocation = ts.getTouchingPropertyName(sourceFile, position);
                 if (!isValidReferencePosition(referenceLocation, search.text)) {
+                    // This wasn't the start of a token.  Check to see if it might be a
+                    // match in a comment or string if that's what the caller is asking
+                    // for.
                     if (!state.options.implementations && (state.options.findInStrings && ts.isInString(sourceFile, position) || state.options.findInComments && ts.isInNonReferenceComment(sourceFile, position))) {
+                        // In the case where we're looking inside comments/strings, we don't have
+                        // an actual definition.  So just use 'undefined' here.  Features like
+                        // 'Rename' won't care (as they ignore the definitions), and features like
+                        // 'FindReferences' will just filter out these results.
                         state.addStringOrCommentReference(sourceFile.fileName, ts.createTextSpan(position, search.text.length));
                     }
                     return;
@@ -76299,10 +93309,11 @@ var ts;
                 }
                 var parent = referenceLocation.parent;
                 if (ts.isImportSpecifier(parent) && parent.propertyName === referenceLocation) {
+                    // This is added through `singleReferences` in ImportsResult. If we happen to see it again, don't add it again.
                     return;
                 }
                 if (ts.isExportSpecifier(parent)) {
-                    ts.Debug.assert(referenceLocation.kind === 71);
+                    ts.Debug.assert(referenceLocation.kind === 71 /* Identifier */);
                     getReferencesAtExportSpecifier(referenceLocation, referenceSymbol, parent, search, state, addReferencesHere);
                     return;
                 }
@@ -76312,14 +93323,14 @@ var ts;
                     return;
                 }
                 switch (state.specialSearchKind) {
-                    case 0:
+                    case 0 /* None */:
                         if (addReferencesHere)
                             addReference(referenceLocation, relatedSymbol, state);
                         break;
-                    case 1:
+                    case 1 /* Constructor */:
                         addConstructorReferences(referenceLocation, sourceFile, search, state);
                         break;
-                    case 2:
+                    case 2 /* Class */:
                         addClassStaticThisReferences(referenceLocation, search, state);
                         break;
                     default:
@@ -76335,11 +93346,14 @@ var ts;
                     return;
                 }
                 if (!propertyName) {
-                    if (!(state.options.isForRename && name.escapedText === "default")) {
+                    // Don't rename at `export { default } from "m";`. (but do continue to search for imports of the re-export)
+                    if (!(state.options.isForRename && name.escapedText === "default" /* Default */)) {
                         addRef();
                     }
                 }
                 else if (referenceLocation === propertyName) {
+                    // For `export { foo as bar } from "baz"`, "`foo`" will be added from the singleReferences for import searches of the original export.
+                    // For `export { foo as bar };`, where `foo` is a local, so add it now.
                     if (!exportDeclaration.moduleSpecifier) {
                         addRef();
                     }
@@ -76352,14 +93366,16 @@ var ts;
                         addRef();
                     }
                 }
+                // For `export { foo as bar }`, rename `foo`, but not `bar`.
                 if (!(referenceLocation === propertyName && state.options.isForRename)) {
-                    var exportKind = referenceLocation.originalKeywordKind === 79 ? 1 : 0;
+                    var exportKind = referenceLocation.originalKeywordKind === 79 /* DefaultKeyword */ ? 1 /* Default */ : 0 /* Named */;
                     var exportInfo = FindAllReferences.getExportInfo(referenceSymbol, exportKind, state.checker);
                     if (!exportInfo)
                         return ts.Debug.fail();
                     searchForImportsOfExport(referenceLocation, referenceSymbol, exportInfo, state);
                 }
-                if (search.comingFrom !== 1 && exportDeclaration.moduleSpecifier && !propertyName) {
+                // At `export { x } from "foo"`, also search for the imported symbol `"foo".x`.
+                if (search.comingFrom !== 1 /* Export */ && exportDeclaration.moduleSpecifier && !propertyName) {
                     var imported = state.checker.getExportSpecifierLocalTargetSymbol(exportSpecifier);
                     if (imported)
                         searchForImportedSymbol(imported, state);
@@ -76376,30 +93392,41 @@ var ts;
                 var parent = exportSpecifier.parent, propertyName = exportSpecifier.propertyName, name = exportSpecifier.name;
                 ts.Debug.assert(propertyName === referenceLocation || name === referenceLocation);
                 if (propertyName) {
+                    // Given `export { foo as bar } [from "someModule"]`: It's an alias at `foo`, but at `bar` it's a new symbol.
                     return propertyName === referenceLocation;
                 }
                 else {
+                    // `export { foo } from "foo"` is a re-export.
+                    // `export { foo };` is not a re-export, it creates an alias for the local variable `foo`.
                     return !parent.parent.moduleSpecifier;
                 }
             }
             function getImportOrExportReferences(referenceLocation, referenceSymbol, search, state) {
-                var importOrExport = FindAllReferences.getImportOrExportSymbol(referenceLocation, referenceSymbol, state.checker, search.comingFrom === 1);
+                var importOrExport = FindAllReferences.getImportOrExportSymbol(referenceLocation, referenceSymbol, state.checker, search.comingFrom === 1 /* Export */);
                 if (!importOrExport)
                     return;
                 var symbol = importOrExport.symbol;
-                if (importOrExport.kind === 0) {
+                if (importOrExport.kind === 0 /* Import */) {
                     if (!state.options.isForRename || importOrExport.isNamedImport) {
                         searchForImportedSymbol(symbol, state);
                     }
                 }
                 else {
+                    // We don't check for `state.isForRename`, even for default exports, because importers that previously matched the export name should be updated to continue matching.
                     searchForImportsOfExport(referenceLocation, symbol, importOrExport.exportInfo, state);
                 }
             }
             function getReferenceForShorthandProperty(_a, search, state) {
                 var flags = _a.flags, valueDeclaration = _a.valueDeclaration;
                 var shorthandValueSymbol = state.checker.getShorthandAssignmentValueSymbol(valueDeclaration);
-                if (!(flags & 33554432) && search.includes(shorthandValueSymbol)) {
+                /*
+                 * Because in short-hand property assignment, an identifier which stored as name of the short-hand property assignment
+                 * has two meanings: property name and property value. Therefore when we do findAllReference at the position where
+                 * an identifier is declared, the language service should return the position of the variable declaration as well as
+                 * the position in short-hand property assignment excluding property accessing. However, if we do findAllReference at the
+                 * position of property accessing, the referenceEntry of such position will be handled in the first case.
+                 */
+                if (!(flags & 33554432 /* Transient */) && search.includes(shorthandValueSymbol)) {
                     addReference(ts.getNameOfDeclaration(valueDeclaration), shorthandValueSymbol, state);
                 }
             }
@@ -76412,16 +93439,19 @@ var ts;
                     addRef(referenceLocation);
                 }
             }
+            /** Adds references when a constructor is used with `new this()` in its own class and `super()` calls in subclasses.  */
             function addConstructorReferences(referenceLocation, sourceFile, search, state) {
                 if (ts.isNewExpressionTarget(referenceLocation)) {
                     addReference(referenceLocation, search.symbol, state);
                 }
                 var pusher = function () { return state.referenceAdder(search.symbol); };
                 if (ts.isClassLike(referenceLocation.parent)) {
-                    ts.Debug.assert(referenceLocation.kind === 79 || referenceLocation.parent.name === referenceLocation);
+                    ts.Debug.assert(referenceLocation.kind === 79 /* DefaultKeyword */ || referenceLocation.parent.name === referenceLocation);
+                    // This is the class declaration containing the constructor.
                     findOwnConstructorReferences(search.symbol, sourceFile, pusher());
                 }
                 else {
+                    // If this class appears in `extends C`, then the extending class' "super" calls are references.
                     var classExtending = tryGetClassByExtendingIdentifier(referenceLocation);
                     if (classExtending) {
                         findSuperConstructorAccesses(classExtending, pusher());
@@ -76437,11 +93467,11 @@ var ts;
                 var addRef = state.referenceAdder(search.symbol);
                 for (var _i = 0, _a = classLike.members; _i < _a.length; _i++) {
                     var member = _a[_i];
-                    if (!(ts.isMethodOrAccessor(member) && ts.hasModifier(member, 32))) {
+                    if (!(ts.isMethodOrAccessor(member) && ts.hasModifier(member, 32 /* Static */))) {
                         continue;
                     }
                     member.body.forEachChild(function cb(node) {
-                        if (node.kind === 99) {
+                        if (node.kind === 99 /* ThisKeyword */) {
                             addRef(node);
                         }
                         else if (!ts.isFunctionLike(node)) {
@@ -76450,19 +93480,23 @@ var ts;
                     });
                 }
             }
+            /**
+             * `classSymbol` is the class where the constructor was defined.
+             * Reference the constructor and all calls to `new this()`.
+             */
             function findOwnConstructorReferences(classSymbol, sourceFile, addNode) {
-                for (var _i = 0, _a = classSymbol.members.get("__constructor").declarations; _i < _a.length; _i++) {
+                for (var _i = 0, _a = classSymbol.members.get("__constructor" /* Constructor */).declarations; _i < _a.length; _i++) {
                     var decl = _a[_i];
-                    var ctrKeyword = ts.findChildOfKind(decl, 123, sourceFile);
-                    ts.Debug.assert(decl.kind === 155 && !!ctrKeyword);
+                    var ctrKeyword = ts.findChildOfKind(decl, 123 /* ConstructorKeyword */, sourceFile);
+                    ts.Debug.assert(decl.kind === 155 /* Constructor */ && !!ctrKeyword);
                     addNode(ctrKeyword);
                 }
                 classSymbol.exports.forEach(function (member) {
                     var decl = member.valueDeclaration;
-                    if (decl && decl.kind === 154) {
+                    if (decl && decl.kind === 154 /* MethodDeclaration */) {
                         var body = decl.body;
                         if (body) {
-                            forEachDescendantOfKind(body, 99, function (thisKeyword) {
+                            forEachDescendantOfKind(body, 99 /* ThisKeyword */, function (thisKeyword) {
                                 if (ts.isNewExpressionTarget(thisKeyword)) {
                                     addNode(thisKeyword);
                                 }
@@ -76471,17 +93505,18 @@ var ts;
                     }
                 });
             }
+            /** Find references to `super` in the constructor of an extending class.  */
             function findSuperConstructorAccesses(cls, addNode) {
-                var ctr = cls.symbol.members.get("__constructor");
+                var ctr = cls.symbol.members.get("__constructor" /* Constructor */);
                 if (!ctr) {
                     return;
                 }
                 for (var _i = 0, _a = ctr.declarations; _i < _a.length; _i++) {
                     var decl = _a[_i];
-                    ts.Debug.assert(decl.kind === 155);
+                    ts.Debug.assert(decl.kind === 155 /* Constructor */);
                     var body = decl.body;
                     if (body) {
-                        forEachDescendantOfKind(body, 97, function (node) {
+                        forEachDescendantOfKind(body, 97 /* SuperKeyword */, function (node) {
                             if (ts.isCallExpressionTarget(node)) {
                                 addNode(node);
                             }
@@ -76490,21 +93525,26 @@ var ts;
                 }
             }
             function addImplementationReferences(refNode, addReference, state) {
+                // Check if we found a function/propertyAssignment/method with an implementation or initializer
                 if (ts.isDeclarationName(refNode) && isImplementation(refNode.parent)) {
                     addReference(refNode);
                     return;
                 }
-                if (refNode.kind !== 71) {
+                if (refNode.kind !== 71 /* Identifier */) {
                     return;
                 }
-                if (refNode.parent.kind === 271) {
+                if (refNode.parent.kind === 271 /* ShorthandPropertyAssignment */) {
+                    // Go ahead and dereference the shorthand assignment by going to its definition
                     getReferenceEntriesForShorthandPropertyAssignment(refNode, state.checker, addReference);
                 }
+                // Check if the node is within an extends or implements clause
                 var containingClass = getContainingClassIfInHeritageClause(refNode);
                 if (containingClass) {
                     addReference(containingClass);
                     return;
                 }
+                // If we got a type reference, try and see if the reference applies to any expressions that can implement an interface
+                // Find the first node whose parent isn't a type node -- i.e., the highest type node.
                 var typeNode = ts.findAncestor(refNode, function (a) { return !ts.isQualifiedName(a.parent) && !ts.isTypeNode(a.parent) && !ts.isTypeElement(a.parent); });
                 var typeHavingNode = typeNode.parent;
                 if (ts.hasType(typeHavingNode) && typeHavingNode.type === typeNode && state.markSeenContainingTypeReference(typeHavingNode)) {
@@ -76513,7 +93553,7 @@ var ts;
                     }
                     else if (ts.isFunctionLike(typeHavingNode) && typeHavingNode.body) {
                         var body = typeHavingNode.body;
-                        if (body.kind === 213) {
+                        if (body.kind === 213 /* Block */) {
                             ts.forEachReturnStatement(body, function (returnStatement) {
                                 if (returnStatement.expression)
                                     addIfImplementation(returnStatement.expression);
@@ -76536,20 +93576,42 @@ var ts;
                 return ts.isIdentifier(node) || ts.isPropertyAccessExpression(node) ? getContainingClassIfInHeritageClause(node.parent)
                     : ts.isExpressionWithTypeArguments(node) ? ts.tryCast(node.parent.parent, ts.isClassLike) : undefined;
             }
+            /**
+             * Returns true if this is an expression that can be considered an implementation
+             */
             function isImplementationExpression(node) {
                 switch (node.kind) {
-                    case 191:
+                    case 191 /* ParenthesizedExpression */:
                         return isImplementationExpression(node.expression);
-                    case 193:
-                    case 192:
-                    case 184:
-                    case 205:
-                    case 183:
+                    case 193 /* ArrowFunction */:
+                    case 192 /* FunctionExpression */:
+                    case 184 /* ObjectLiteralExpression */:
+                    case 205 /* ClassExpression */:
+                    case 183 /* ArrayLiteralExpression */:
                         return true;
                     default:
                         return false;
                 }
             }
+            /**
+             * Determines if the parent symbol occurs somewhere in the child's ancestry. If the parent symbol
+             * is an interface, determines if some ancestor of the child symbol extends or inherits from it.
+             * Also takes in a cache of previous results which makes this slightly more efficient and is
+             * necessary to avoid potential loops like so:
+             *     class A extends B { }
+             *     class B extends A { }
+             *
+             * We traverse the AST rather than using the type checker because users are typically only interested
+             * in explicit implementations of an interface/class when calling "Go to Implementation". Sibling
+             * implementations of types that share a common ancestor with the type whose implementation we are
+             * searching for need to be filtered out of the results. The type checker doesn't let us make the
+             * distinction between structurally compatible implementations and explicit implementations, so we
+             * must use the AST.
+             *
+             * @param symbol         A class or interface Symbol
+             * @param parent        Another class or interface Symbol
+             * @param cachedResults A map of symbol id pairs (i.e. "child,parent") to booleans indicating previous results
+             */
             function explicitlyInheritsFrom(symbol, parent, cachedResults, checker) {
                 if (symbol === parent) {
                     return true;
@@ -76559,6 +93621,7 @@ var ts;
                 if (cached !== undefined) {
                     return cached;
                 }
+                // Set the key so that we don't infinitely recurse
                 cachedResults.set(key, false);
                 var inherits = symbol.declarations.some(function (declaration) {
                     return ts.getAllSuperTypeNodes(declaration).some(function (typeReference) {
@@ -76570,81 +93633,92 @@ var ts;
                 return inherits;
             }
             function getReferencesForSuperKeyword(superKeyword) {
-                var searchSpaceNode = ts.getSuperContainer(superKeyword, false);
+                var searchSpaceNode = ts.getSuperContainer(superKeyword, /*stopOnFunctions*/ false);
                 if (!searchSpaceNode) {
                     return undefined;
                 }
-                var staticFlag = 32;
+                // Whether 'super' occurs in a static context within a class.
+                var staticFlag = 32 /* Static */;
                 switch (searchSpaceNode.kind) {
-                    case 152:
-                    case 151:
-                    case 154:
-                    case 153:
-                    case 155:
-                    case 156:
-                    case 157:
+                    case 152 /* PropertyDeclaration */:
+                    case 151 /* PropertySignature */:
+                    case 154 /* MethodDeclaration */:
+                    case 153 /* MethodSignature */:
+                    case 155 /* Constructor */:
+                    case 156 /* GetAccessor */:
+                    case 157 /* SetAccessor */:
                         staticFlag &= ts.getModifierFlags(searchSpaceNode);
-                        searchSpaceNode = searchSpaceNode.parent;
+                        searchSpaceNode = searchSpaceNode.parent; // re-assign to be the owning class
                         break;
                     default:
                         return undefined;
                 }
                 var sourceFile = searchSpaceNode.getSourceFile();
                 var references = ts.mapDefined(getPossibleSymbolReferenceNodes(sourceFile, "super", searchSpaceNode), function (node) {
-                    if (node.kind !== 97) {
+                    if (node.kind !== 97 /* SuperKeyword */) {
                         return;
                     }
-                    var container = ts.getSuperContainer(node, false);
-                    return container && (32 & ts.getModifierFlags(container)) === staticFlag && container.parent.symbol === searchSpaceNode.symbol ? FindAllReferences.nodeEntry(node) : undefined;
+                    var container = ts.getSuperContainer(node, /*stopOnFunctions*/ false);
+                    // If we have a 'super' container, we must have an enclosing class.
+                    // Now make sure the owning class is the same as the search-space
+                    // and has the same static qualifier as the original 'super's owner.
+                    return container && (32 /* Static */ & ts.getModifierFlags(container)) === staticFlag && container.parent.symbol === searchSpaceNode.symbol ? FindAllReferences.nodeEntry(node) : undefined;
                 });
                 return [{ definition: { type: "symbol", symbol: searchSpaceNode.symbol }, references: references }];
             }
             function getReferencesForThisKeyword(thisOrSuperKeyword, sourceFiles, cancellationToken) {
-                var searchSpaceNode = ts.getThisContainer(thisOrSuperKeyword, false);
-                var staticFlag = 32;
+                var searchSpaceNode = ts.getThisContainer(thisOrSuperKeyword, /* includeArrowFunctions */ false);
+                // Whether 'this' occurs in a static context within a class.
+                var staticFlag = 32 /* Static */;
                 switch (searchSpaceNode.kind) {
-                    case 154:
-                    case 153:
+                    case 154 /* MethodDeclaration */:
+                    case 153 /* MethodSignature */:
                         if (ts.isObjectLiteralMethod(searchSpaceNode)) {
                             break;
                         }
-                    case 152:
-                    case 151:
-                    case 155:
-                    case 156:
-                    case 157:
+                    // falls through
+                    case 152 /* PropertyDeclaration */:
+                    case 151 /* PropertySignature */:
+                    case 155 /* Constructor */:
+                    case 156 /* GetAccessor */:
+                    case 157 /* SetAccessor */:
                         staticFlag &= ts.getModifierFlags(searchSpaceNode);
-                        searchSpaceNode = searchSpaceNode.parent;
+                        searchSpaceNode = searchSpaceNode.parent; // re-assign to be the owning class
                         break;
-                    case 274:
+                    case 274 /* SourceFile */:
                         if (ts.isExternalModule(searchSpaceNode)) {
                             return undefined;
                         }
-                    case 234:
-                    case 192:
+                    // falls through
+                    case 234 /* FunctionDeclaration */:
+                    case 192 /* FunctionExpression */:
                         break;
+                    // Computed properties in classes are not handled here because references to this are illegal,
+                    // so there is no point finding references to them.
                     default:
                         return undefined;
                 }
-                var references = ts.flatMap(searchSpaceNode.kind === 274 ? sourceFiles : [searchSpaceNode.getSourceFile()], function (sourceFile) {
+                var references = ts.flatMap(searchSpaceNode.kind === 274 /* SourceFile */ ? sourceFiles : [searchSpaceNode.getSourceFile()], function (sourceFile) {
                     cancellationToken.throwIfCancellationRequested();
                     return getPossibleSymbolReferenceNodes(sourceFile, "this", ts.isSourceFile(searchSpaceNode) ? sourceFile : searchSpaceNode).filter(function (node) {
                         if (!ts.isThis(node)) {
                             return false;
                         }
-                        var container = ts.getThisContainer(node, false);
+                        var container = ts.getThisContainer(node, /* includeArrowFunctions */ false);
                         switch (searchSpaceNode.kind) {
-                            case 192:
-                            case 234:
+                            case 192 /* FunctionExpression */:
+                            case 234 /* FunctionDeclaration */:
                                 return searchSpaceNode.symbol === container.symbol;
-                            case 154:
-                            case 153:
+                            case 154 /* MethodDeclaration */:
+                            case 153 /* MethodSignature */:
                                 return ts.isObjectLiteralMethod(searchSpaceNode) && searchSpaceNode.symbol === container.symbol;
-                            case 205:
-                            case 235:
-                                return container.parent && searchSpaceNode.symbol === container.parent.symbol && (ts.getModifierFlags(container) & 32) === staticFlag;
-                            case 274:
-                                return container.kind === 274 && !ts.isExternalModule(container);
+                            case 205 /* ClassExpression */:
+                            case 235 /* ClassDeclaration */:
+                                // Make sure the container belongs to the same class
+                                // and has the appropriate static modifier from the original container.
+                                return container.parent && searchSpaceNode.symbol === container.parent.symbol && (ts.getModifierFlags(container) & 32 /* Static */) === staticFlag;
+                            case 274 /* SourceFile */:
+                                return container.kind === 274 /* SourceFile */ && !ts.isExternalModule(container);
                         }
                     });
                 }).map(function (n) { return FindAllReferences.nodeEntry(n); });
@@ -76657,7 +93731,7 @@ var ts;
                 var references = ts.flatMap(sourceFiles, function (sourceFile) {
                     cancellationToken.throwIfCancellationRequested();
                     return ts.mapDefined(getPossibleSymbolReferenceNodes(sourceFile, node.text), function (ref) {
-                        return ts.isStringLiteral(ref) && ref.text === node.text ? FindAllReferences.nodeEntry(ref, true) : undefined;
+                        return ts.isStringLiteral(ref) && ref.text === node.text ? FindAllReferences.nodeEntry(ref, /*isInString*/ true) : undefined;
                     });
                 });
                 return [{
@@ -76665,21 +93739,41 @@ var ts;
                         references: references
                     }];
             }
+            // For certain symbol kinds, we need to include other symbols in the search set.
+            // This is not needed when searching for re-exports.
             function populateSearchSymbolSet(symbol, location, checker, implementations) {
                 var result = [];
-                forEachRelatedSymbol(symbol, location, checker, function (sym, root, base) { result.push(base || root || sym); }, function () { return !implementations; });
+                forEachRelatedSymbol(symbol, location, checker, function (sym, root, base) { result.push(base || root || sym); }, 
+                /*allowBaseTypes*/ function () { return !implementations; });
                 return result;
             }
             function forEachRelatedSymbol(symbol, location, checker, cbSymbol, allowBaseTypes) {
                 var containingObjectLiteralElement = ts.getContainingObjectLiteralElement(location);
                 if (containingObjectLiteralElement) {
+                    // If the location is in a context sensitive location (i.e. in an object literal) try
+                    // to get a contextual type for it, and add the property symbol from the contextual
+                    // type to the search set
                     var res_1 = ts.firstDefined(getPropertySymbolsFromContextualType(containingObjectLiteralElement, checker), fromRoot);
                     if (res_1)
                         return res_1;
+                    // If the location is name of property symbol from object literal destructuring pattern
+                    // Search the property symbol
+                    //      for ( { property: p2 } of elems) { }
                     var propertySymbol = getPropertySymbolOfDestructuringAssignment(location, checker);
                     var res1 = propertySymbol && cbSymbol(propertySymbol);
                     if (res1)
                         return res1;
+                    /* Because in short-hand property assignment, location has two meaning : property name and as value of the property
+                     * When we do findAllReference at the position of the short-hand property assignment, we would want to have references to position of
+                     * property name and variable declaration of the identifier.
+                     * Like in below example, when querying for all references for an identifier 'name', of the property assignment, the language service
+                     * should show both 'name' in 'obj' and 'name' in variable declaration
+                     *      const name = "Foo";
+                     *      const obj = { name };
+                     * In order to do that, we will populate the search set with the value symbol of the identifier as a value of the property assignment
+                     * so that when matching with potential reference symbol, both symbols from property declaration and variable declaration
+                     * will be included correctly.
+                     */
                     var shorthandValueSymbol = checker.getShorthandAssignmentValueSymbol(location.parent);
                     var res2 = shorthandValueSymbol && cbSymbol(shorthandValueSymbol);
                     if (res2)
@@ -76689,16 +93783,26 @@ var ts;
                 if (res)
                     return res;
                 if (symbol.valueDeclaration && ts.isParameterPropertyDeclaration(symbol.valueDeclaration)) {
+                    // For a parameter property, now try on the other symbol (property if this was a parameter, parameter if this was a property).
                     var paramProps = checker.getSymbolsOfParameterPropertyDeclaration(ts.cast(symbol.valueDeclaration, ts.isParameter), symbol.name);
-                    ts.Debug.assert(paramProps.length === 2 && !!(paramProps[0].flags & 1) && !!(paramProps[1].flags & 4));
-                    return fromRoot(symbol.flags & 1 ? paramProps[1] : paramProps[0]);
+                    ts.Debug.assert(paramProps.length === 2 && !!(paramProps[0].flags & 1 /* FunctionScopedVariable */) && !!(paramProps[1].flags & 4 /* Property */)); // is [parameter, property]
+                    return fromRoot(symbol.flags & 1 /* FunctionScopedVariable */ ? paramProps[1] : paramProps[0]);
                 }
+                // If this is symbol of binding element without propertyName declaration in Object binding pattern
+                // Include the property in the search
                 var bindingElementPropertySymbol = getPropertySymbolOfObjectBindingPatternWithoutPropertyName(symbol, checker);
                 return bindingElementPropertySymbol && fromRoot(bindingElementPropertySymbol);
                 function fromRoot(sym) {
+                    // If this is a union property:
+                    //   - In populateSearchSymbolsSet we will add all the symbols from all its source symbols in all unioned types.
+                    //   - In findRelatedSymbol, we will just use the union symbol if any source symbol is included in the search.
+                    // If the symbol is an instantiation from a another symbol (e.g. widened symbol):
+                    //   - In populateSearchSymbolsSet, add the root the list
+                    //   - In findRelatedSymbol, return the source symbol if that is in the search. (Do not return the instantiation symbol.)
                     return ts.firstDefined(checker.getRootSymbols(sym), function (rootSymbol) {
                         return cbSymbol(sym, rootSymbol)
-                            || (rootSymbol.parent && rootSymbol.parent.flags & (32 | 64) && allowBaseTypes(rootSymbol)
+                            // Add symbol of properties/methods of the same name in base classes and implemented interfaces definitions
+                            || (rootSymbol.parent && rootSymbol.parent.flags & (32 /* Class */ | 64 /* Interface */) && allowBaseTypes(rootSymbol)
                                 ? ts.getPropertySymbolsFromBaseTypes(rootSymbol.parent, rootSymbol.name, checker, function (base) { return cbSymbol(sym, rootSymbol, base); })
                                 : undefined);
                     });
@@ -76707,27 +93811,43 @@ var ts;
             function getRelatedSymbol(search, referenceSymbol, referenceLocation, state) {
                 var checker = state.checker;
                 return forEachRelatedSymbol(referenceSymbol, referenceLocation, checker, function (sym, rootSymbol, baseSymbol) { return search.includes(baseSymbol || rootSymbol || sym)
-                    ? rootSymbol && !(ts.getCheckFlags(sym) & 6) ? rootSymbol : sym
-                    : undefined; }, function (rootSymbol) {
+                    // For a base type, use the symbol for the derived type. For a synthetic (e.g. union) property, use the union symbol.
+                    ? rootSymbol && !(ts.getCheckFlags(sym) & 6 /* Synthetic */) ? rootSymbol : sym
+                    : undefined; }, 
+                /*allowBaseTypes*/ function (rootSymbol) {
                     return !(search.parents && !search.parents.some(function (parent) { return explicitlyInheritsFrom(rootSymbol.parent, parent, state.inheritsFromCache, checker); }));
                 });
             }
+            /** Gets all symbols for one property. Does not get symbols for every property. */
             function getPropertySymbolsFromContextualType(node, checker) {
                 var contextualType = checker.getContextualType(node.parent);
                 var name = ts.getNameFromPropertyName(node.name);
                 var symbol = contextualType && name && contextualType.getProperty(name);
                 return symbol ? [symbol] :
-                    contextualType && contextualType.isUnion() ? ts.mapDefined(contextualType.types, function (t) { return t.getProperty(name); }) : ts.emptyArray;
+                    contextualType && contextualType.isUnion() ? ts.mapDefined(contextualType.types, function (t) { return t.getProperty(name); }) : ts.emptyArray; // TODO: GH#18217
             }
+            /**
+             * Given an initial searchMeaning, extracted from a location, widen the search scope based on the declarations
+             * of the corresponding symbol. e.g. if we are searching for "Foo" in value position, but "Foo" references a class
+             * then we need to widen the search to include type positions as well.
+             * On the contrary, if we are searching for "Bar" in type position and we trace bar to an interface, and an uninstantiated
+             * module, we want to keep the search limited to only types, as the two declarations (interface and uninstantiated module)
+             * do not intersect in any of the three spaces.
+             */
             function getIntersectingMeaningFromDeclarations(node, symbol) {
                 var meaning = ts.getMeaningFromLocation(node);
                 var declarations = symbol.declarations;
                 if (declarations) {
                     var lastIterationMeaning = void 0;
                     do {
+                        // The result is order-sensitive, for instance if initialMeaning === Namespace, and declarations = [class, instantiated module]
+                        // we need to consider both as they initialMeaning intersects with the module in the namespace space, and the module
+                        // intersects with the class in the value space.
+                        // To achieve that we will keep iterating until the result stabilizes.
+                        // Remember the last meaning
                         lastIterationMeaning = meaning;
-                        for (var _i = 0, declarations_11 = declarations; _i < declarations_11.length; _i++) {
-                            var declaration = declarations_11[_i];
+                        for (var _i = 0, declarations_2 = declarations; _i < declarations_2.length; _i++) {
+                            var declaration = declarations_2[_i];
                             var declarationMeaning = ts.getMeaningFromDeclaration(declaration);
                             if (declarationMeaning & meaning) {
                                 meaning |= declarationMeaning;
@@ -76739,7 +93859,7 @@ var ts;
             }
             Core.getIntersectingMeaningFromDeclarations = getIntersectingMeaningFromDeclarations;
             function isImplementation(node) {
-                return !!(node.flags & 4194304)
+                return !!(node.flags & 4194304 /* Ambient */)
                     || (ts.isVariableLike(node) ? ts.hasInitializer(node)
                         : ts.isFunctionLikeDeclaration(node) ? !!node.body
                             : ts.isClassLike(node) || ts.isModuleOrEnumDeclaration(node));
@@ -76750,7 +93870,7 @@ var ts;
                 if (shorthandSymbol) {
                     for (var _i = 0, _a = shorthandSymbol.getDeclarations(); _i < _a.length; _i++) {
                         var declaration = _a[_i];
-                        if (ts.getMeaningFromDeclaration(declaration) & 1) {
+                        if (ts.getMeaningFromDeclaration(declaration) & 1 /* Value */) {
                             addReference(declaration);
                         }
                     }
@@ -76765,20 +93885,28 @@ var ts;
                     forEachDescendantOfKind(child, kind, action);
                 });
             }
+            /** Get `C` given `N` if `N` is in the position `class C extends N` or `class C extends foo.N` where `N` is an identifier. */
             function tryGetClassByExtendingIdentifier(node) {
                 return ts.tryGetClassExtendingExpressionWithTypeArguments(ts.climbPastPropertyAccess(node).parent);
             }
+            /**
+             * If we are just looking for implementations and this is a property access expression, we need to get the
+             * symbol of the local type of the symbol the property is being accessed on. This is because our search
+             * symbol may have a different parent symbol if the local type's symbol does not declare the property
+             * being accessed (i.e. it is declared in some parent class or interface)
+             */
             function getParentSymbolsOfPropertyAccess(location, symbol, checker) {
                 var propertyAccessExpression = ts.isRightSideOfPropertyAccess(location) ? location.parent : undefined;
                 var lhsType = propertyAccessExpression && checker.getTypeAtLocation(propertyAccessExpression.expression);
                 var res = ts.mapDefined(lhsType && (lhsType.isUnionOrIntersection() ? lhsType.types : lhsType.symbol === symbol.parent ? undefined : [lhsType]), function (t) {
-                    return t.symbol && t.symbol.flags & (32 | 64) ? t.symbol : undefined;
+                    return t.symbol && t.symbol.flags & (32 /* Class */ | 64 /* Interface */) ? t.symbol : undefined;
                 });
                 return res.length === 0 ? undefined : res;
             }
         })(Core = FindAllReferences.Core || (FindAllReferences.Core = {}));
     })(FindAllReferences = ts.FindAllReferences || (ts.FindAllReferences = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     function getEditsForFileRename(program, oldFileOrDirPath, newFileOrDirPath, host, formatContext, preferences) {
@@ -76818,7 +93946,8 @@ var ts;
                     var foundExactMatch = updatePaths(property);
                     if (!foundExactMatch && propertyName === "include" && ts.isArrayLiteralExpression(property.initializer)) {
                         var includes = ts.mapDefined(property.initializer.elements, function (e) { return ts.isStringLiteral(e) ? e.text : undefined; });
-                        var matchers = ts.getFileMatcherPatterns(configDir, [], includes, useCaseSensitiveFileNames, currentDirectory);
+                        var matchers = ts.getFileMatcherPatterns(configDir, /*excludes*/ [], includes, useCaseSensitiveFileNames, currentDirectory);
+                        // If there isn't some include for this, add a new one.
                         if (!ts.getRegexFromPattern(ts.Debug.assertDefined(matchers.includeFilePattern), useCaseSensitiveFileNames).test(newFileOrDirPath)) {
                             changeTracker.insertNodeAfter(configFile, ts.last(property.initializer.elements), ts.createStringLiteral(relativePath(newFileOrDirPath)));
                         }
@@ -76846,10 +93975,11 @@ var ts;
             }
         });
         function updatePaths(property) {
+            // Type annotation needed due to #7294
             var elements = ts.isArrayLiteralExpression(property.initializer) ? property.initializer.elements : [property.initializer];
             var foundExactMatch = false;
-            for (var _i = 0, elements_5 = elements; _i < elements_5.length; _i++) {
-                var element = elements_5[_i];
+            for (var _i = 0, elements_1 = elements; _i < elements_1.length; _i++) {
+                var element = elements_1[_i];
                 foundExactMatch = tryUpdateString(element) || foundExactMatch;
             }
             return foundExactMatch;
@@ -76866,11 +93996,11 @@ var ts;
             return false;
         }
         function relativePath(path) {
-            return ts.getRelativePathFromDirectory(configDir, path, !useCaseSensitiveFileNames);
+            return ts.getRelativePathFromDirectory(configDir, path, /*ignoreCase*/ !useCaseSensitiveFileNames);
         }
     }
     function updateImports(program, changeTracker, oldToNew, newToOld, host, getCanonicalFileName, preferences) {
-        var _loop_14 = function (sourceFile) {
+        var _loop_3 = function (sourceFile) {
             var newImportFromPath = oldToNew(sourceFile.fileName) || sourceFile.fileName;
             var newImportFromDirectory = ts.getDirectoryPath(newImportFromPath);
             var oldFromNew = newToOld(sourceFile.fileName);
@@ -76884,14 +94014,16 @@ var ts;
                 return newAbsolute === undefined ? undefined : ts.ensurePathIsNonModuleName(ts.getRelativePathFromDirectory(newImportFromDirectory, newAbsolute, getCanonicalFileName));
             }, function (importLiteral) {
                 var toImport = oldFromNew !== undefined
+                    // If we're at the new location (file was already renamed), need to redo module resolution starting from the old location.
+                    // TODO:GH#18217
                     ? getSourceFileToImportFromResolved(ts.resolveModuleName(importLiteral.text, oldImportFromPath, program.getCompilerOptions(), host), oldToNew, program)
                     : getSourceFileToImport(importLiteral, sourceFile, program, host, oldToNew);
-                return toImport === undefined ? undefined : ts.moduleSpecifiers.getModuleSpecifier(program, sourceFile, newImportFromPath, toImport, host, preferences);
+                return toImport === undefined ? undefined : ts.moduleSpecifiers.getModuleSpecifier(program.getCompilerOptions(), sourceFile, newImportFromPath, toImport, host, preferences);
             });
         };
         for (var _i = 0, _a = program.getSourceFiles(); _i < _a.length; _i++) {
             var sourceFile = _a[_i];
-            _loop_14(sourceFile);
+            _loop_3(sourceFile);
         }
     }
     function combineNormal(pathA, pathB) {
@@ -76904,7 +94036,7 @@ var ts;
         var symbol = program.getTypeChecker().getSymbolAtLocation(importLiteral);
         if (symbol) {
             if (symbol.declarations.some(function (d) { return ts.isAmbientModule(d); }))
-                return undefined;
+                return undefined; // No need to update if it's an ambient module
             var oldFileName = ts.find(symbol.declarations, ts.isSourceFile).fileName;
             return oldToNew(oldFileName) || oldFileName;
         }
@@ -76952,6 +94084,7 @@ var ts;
         }
     }
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var GoToDefinition;
@@ -76961,32 +94094,59 @@ var ts;
             if (reference) {
                 return [getDefinitionInfoForFileReference(reference.fileName, reference.file.fileName)];
             }
-            var node = ts.getTouchingPropertyName(sourceFile, position, true);
+            var node = ts.getTouchingPropertyName(sourceFile, position);
             if (node === sourceFile) {
                 return undefined;
             }
             var parent = node.parent;
+            // Labels
             if (ts.isJumpStatementTarget(node)) {
                 var label = ts.getTargetLabel(node.parent, node.text);
-                return label ? [createDefinitionInfoFromName(label, "label", node.text, undefined)] : undefined;
+                return label ? [createDefinitionInfoFromName(label, "label" /* label */, node.text, /*containerName*/ undefined)] : undefined; // TODO: GH#18217
             }
             var typeChecker = program.getTypeChecker();
             var symbol = getSymbol(node, typeChecker);
+            // Could not find a symbol e.g. node is string or number keyword,
+            // or the symbol was an internal symbol and does not have a declaration e.g. undefined symbol
             if (!symbol) {
                 return getDefinitionInfoForIndexSignatures(node, typeChecker);
             }
             var calledDeclaration = tryGetSignatureDeclaration(typeChecker, node);
             if (calledDeclaration) {
                 var sigInfo = createDefinitionFromSignatureDeclaration(typeChecker, calledDeclaration);
-                return typeChecker.getRootSymbols(symbol).some(function (s) { return calledDeclaration.symbol === s || calledDeclaration.symbol.parent === s; }) ||
-                    symbol.declarations.some(function (d) { return ts.isVariableDeclaration(d) && !!d.initializer && ts.isRequireCall(d.initializer, false); })
-                    ? [sigInfo]
-                    : [sigInfo].concat(getDefinitionFromSymbol(typeChecker, symbol, node));
+                // For a function, if this is the original function definition, return just sigInfo.
+                // If this is the original constructor definition, parent is the class.
+                if (typeChecker.getRootSymbols(symbol).some(function (s) { return calledDeclaration.symbol === s || calledDeclaration.symbol.parent === s; }) ||
+                    // TODO: GH#23742 Following check shouldn't be necessary if 'require' is an alias
+                    symbol.declarations.some(function (d) { return ts.isVariableDeclaration(d) && !!d.initializer && ts.isRequireCall(d.initializer, /*checkArgumentIsStringLiteralLike*/ false); })) {
+                    return [sigInfo];
+                }
+                else {
+                    var defs = getDefinitionFromSymbol(typeChecker, symbol, node);
+                    // For a 'super()' call, put the signature first, else put the variable first.
+                    return node.kind === 97 /* SuperKeyword */ ? [sigInfo].concat(defs) : defs.concat([sigInfo]);
+                }
             }
-            if (node.parent.kind === 271) {
+            // Because name in short-hand property assignment has two different meanings: property name and property value,
+            // using go-to-definition at such position should go to the variable declaration of the property value rather than
+            // go to the declaration of the property name (in this case stay at the same position). However, if go-to-definition
+            // is performed at the location of property access, we would like to go to definition of the property in the short-hand
+            // assignment. This case and others are handled by the following code.
+            if (node.parent.kind === 271 /* ShorthandPropertyAssignment */) {
                 var shorthandSymbol_1 = typeChecker.getShorthandAssignmentValueSymbol(symbol.valueDeclaration);
                 return shorthandSymbol_1 ? shorthandSymbol_1.declarations.map(function (decl) { return createDefinitionInfo(decl, typeChecker, shorthandSymbol_1, node); }) : [];
             }
+            // If the node is the name of a BindingElement within an ObjectBindingPattern instead of just returning the
+            // declaration the symbol (which is itself), we should try to get to the original type of the ObjectBindingPattern
+            // and return the property declaration for the referenced property.
+            // For example:
+            //      import('./foo').then(({ b/*goto*/ar }) => undefined); => should get use to the declaration in file "./foo"
+            //
+            //      function bar<T>(onfulfilled: (value: T) => void) { //....}
+            //      interface Test {
+            //          pr/*destination*/op1: number
+            //      }
+            //      bar<Test>(({pr/*goto*/op1})=>{});
             if (ts.isPropertyName(node) && ts.isBindingElement(parent) && ts.isObjectBindingPattern(parent.parent) &&
                 (node === (parent.propertyName || parent.name))) {
                 var type = typeChecker.getTypeAtLocation(parent.parent);
@@ -76997,6 +94157,15 @@ var ts;
                     }
                 }
             }
+            // If the current location we want to find its definition is in an object literal, try to get the contextual type for the
+            // object literal, lookup the property symbol in the contextual type, and use this for goto-definition.
+            // For example
+            //      interface Props{
+            //          /*first*/prop1: number
+            //          prop2: boolean
+            //      }
+            //      function Foo(arg: Props) {}
+            //      Foo( { pr/*1*/op1: 10, prop2: true })
             var element = ts.getContainingObjectLiteralElement(node);
             if (element && typeChecker.getContextualType(element.parent)) {
                 return ts.flatMap(ts.getPropertySymbolsFromContextualType(typeChecker, element), function (propertySymbol) {
@@ -77015,14 +94184,20 @@ var ts;
             var typeReferenceDirective = findReferenceInPosition(sourceFile.typeReferenceDirectives, position);
             if (typeReferenceDirective) {
                 var reference = program.getResolvedTypeReferenceDirectives().get(typeReferenceDirective.fileName);
-                var file = reference && program.getSourceFile(reference.resolvedFileName);
+                var file = reference && program.getSourceFile(reference.resolvedFileName); // TODO:GH#18217
                 return file && { fileName: typeReferenceDirective.fileName, file: file };
             }
+            var libReferenceDirective = findReferenceInPosition(sourceFile.libReferenceDirectives, position);
+            if (libReferenceDirective) {
+                var file = program.getLibFileFromReference(libReferenceDirective);
+                return file && { fileName: libReferenceDirective.fileName, file: file };
+            }
             return undefined;
         }
         GoToDefinition.getReferenceAtPosition = getReferenceAtPosition;
+        /// Goto type
         function getTypeDefinitionAtPosition(typeChecker, sourceFile, position) {
-            var node = ts.getTouchingPropertyName(sourceFile, position, true);
+            var node = ts.getTouchingPropertyName(sourceFile, position);
             if (node === sourceFile) {
                 return undefined;
             }
@@ -77031,7 +94206,7 @@ var ts;
             if (!type) {
                 return undefined;
             }
-            if (type.isUnion() && !(type.flags & 32)) {
+            if (type.isUnion() && !(type.flags & 32 /* Enum */)) {
                 return ts.flatMap(type.types, function (t) { return t.symbol && getDefinitionFromSymbol(typeChecker, t.symbol, node); });
             }
             return type.symbol && getDefinitionFromSymbol(typeChecker, type.symbol, node);
@@ -77042,27 +94217,35 @@ var ts;
             if (!definitions || definitions.length === 0) {
                 return undefined;
             }
-            var comment = findReferenceInPosition(sourceFile.referencedFiles, position) || findReferenceInPosition(sourceFile.typeReferenceDirectives, position);
+            // Check if position is on triple slash reference.
+            var comment = findReferenceInPosition(sourceFile.referencedFiles, position) ||
+                findReferenceInPosition(sourceFile.typeReferenceDirectives, position) ||
+                findReferenceInPosition(sourceFile.libReferenceDirectives, position);
             if (comment) {
                 return { definitions: definitions, textSpan: ts.createTextSpanFromRange(comment) };
             }
-            var node = ts.getTouchingPropertyName(sourceFile, position, true);
+            var node = ts.getTouchingPropertyName(sourceFile, position);
             var textSpan = ts.createTextSpan(node.getStart(), node.getWidth());
             return { definitions: definitions, textSpan: textSpan };
         }
         GoToDefinition.getDefinitionAndBoundSpan = getDefinitionAndBoundSpan;
+        // At 'x.foo', see if the type of 'x' has an index signature, and if so find its declarations.
         function getDefinitionInfoForIndexSignatures(node, checker) {
             if (!ts.isPropertyAccessExpression(node.parent) || node.parent.name !== node)
                 return;
             var type = checker.getTypeAtLocation(node.parent.expression);
             return ts.mapDefined(type.isUnionOrIntersection() ? type.types : [type], function (nonUnionType) {
-                var info = checker.getIndexInfoOfType(nonUnionType, 0);
+                var info = checker.getIndexInfoOfType(nonUnionType, 0 /* String */);
                 return info && info.declaration && createDefinitionFromSignatureDeclaration(checker, info.declaration);
             });
         }
         function getSymbol(node, checker) {
             var symbol = checker.getSymbolAtLocation(node);
-            if (symbol && symbol.flags & 2097152 && shouldSkipAlias(node, symbol.declarations[0])) {
+            // If this is an alias, and the request came at the declaration location
+            // get the aliased symbol instead. This allows for goto def on an import e.g.
+            //   import {A, B} from "mod";
+            // to jump to the implementation directly.
+            if (symbol && symbol.flags & 2097152 /* Alias */ && shouldSkipAlias(node, symbol.declarations[0])) {
                 var aliased = checker.getAliasedSymbol(symbol);
                 if (aliased.declarations) {
                     return aliased;
@@ -77070,19 +94253,24 @@ var ts;
             }
             return symbol;
         }
+        // Go to the original declaration for cases:
+        //
+        //   (1) when the aliased symbol was declared in the location(parent).
+        //   (2) when the aliased symbol is originating from an import.
+        //
         function shouldSkipAlias(node, declaration) {
-            if (node.kind !== 71) {
+            if (node.kind !== 71 /* Identifier */) {
                 return false;
             }
             if (node.parent === declaration) {
                 return true;
             }
             switch (declaration.kind) {
-                case 245:
-                case 243:
+                case 245 /* ImportClause */:
+                case 243 /* ImportEqualsDeclaration */:
                     return true;
-                case 248:
-                    return declaration.parent.kind === 247;
+                case 248 /* ImportSpecifier */:
+                    return declaration.parent.kind === 247 /* NamedImports */;
                 default:
                     return false;
             }
@@ -77090,14 +94278,16 @@ var ts;
         function getDefinitionFromSymbol(typeChecker, symbol, node) {
             return getConstructSignatureDefinition() || getCallSignatureDefinition() || ts.map(symbol.declarations, function (declaration) { return createDefinitionInfo(declaration, typeChecker, symbol, node); });
             function getConstructSignatureDefinition() {
-                if (symbol.flags & 32 && (ts.isNewExpressionTarget(node) || node.kind === 123)) {
+                // Applicable only if we are in a new expression, or we are on a constructor declaration
+                // and in either case the symbol has a construct signature definition, i.e. class
+                if (symbol.flags & 32 /* Class */ && (ts.isNewExpressionTarget(node) || node.kind === 123 /* ConstructorKeyword */)) {
                     var cls = ts.find(symbol.declarations, ts.isClassLike) || ts.Debug.fail("Expected declaration to have at least one class-like declaration");
-                    return getSignatureDefinition(cls.members, true);
+                    return getSignatureDefinition(cls.members, /*selectConstructors*/ true);
                 }
             }
             function getCallSignatureDefinition() {
                 return ts.isCallExpressionTarget(node) || ts.isNewExpressionTarget(node) || ts.isNameOfFunctionDeclaration(node)
-                    ? getSignatureDefinition(symbol.declarations, false)
+                    ? getSignatureDefinition(symbol.declarations, /*selectConstructors*/ false)
                     : undefined;
             }
             function getSignatureDefinition(signatureDeclarations, selectConstructors) {
@@ -77110,12 +94300,14 @@ var ts;
                     : undefined;
             }
         }
+        /** Creates a DefinitionInfo from a Declaration, using the declaration's name if possible. */
         function createDefinitionInfo(declaration, checker, symbol, node) {
-            var symbolName = checker.symbolToString(symbol);
+            var symbolName = checker.symbolToString(symbol); // Do not get scoped name, just the name of the symbol
             var symbolKind = ts.SymbolDisplay.getSymbolKind(checker, symbol, node);
             var containerName = symbol.parent ? checker.symbolToString(symbol.parent, node) : "";
             return createDefinitionInfoFromName(declaration, symbolKind, symbolName, containerName);
         }
+        /** Creates a DefinitionInfo directly from the name of a declaration. */
         function createDefinitionInfoFromName(declaration, symbolKind, symbolName, containerName) {
             var name = ts.getNameOfDeclaration(declaration) || declaration;
             var sourceFile = name.getSourceFile();
@@ -77139,12 +94331,13 @@ var ts;
             return {
                 fileName: targetFileName,
                 textSpan: ts.createTextSpanFromBounds(0, 0),
-                kind: "script",
+                kind: "script" /* scriptElement */,
                 name: name,
                 containerName: undefined,
                 containerKind: undefined,
             };
         }
+        /** Returns a CallLikeExpression where `node` is the target being invoked. */
         function getAncestorCallLikeExpression(node) {
             var target = climbPastManyPropertyAccesses(node);
             var callLike = target.parent;
@@ -77156,10 +94349,12 @@ var ts;
         function tryGetSignatureDeclaration(typeChecker, node) {
             var callLike = getAncestorCallLikeExpression(node);
             var signature = callLike && typeChecker.getResolvedSignature(callLike);
+            // Don't go to a function type, go to the value having that type.
             return ts.tryCast(signature && signature.declaration, function (d) { return ts.isFunctionLike(d) && !ts.isFunctionTypeNode(d); });
         }
     })(GoToDefinition = ts.GoToDefinition || (ts.GoToDefinition = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var JsDoc;
@@ -77211,6 +94406,12 @@ var ts;
         var jsDocTagNameCompletionEntries;
         var jsDocTagCompletionEntries;
         function getJsDocCommentsFromDeclarations(declarations) {
+            // Only collect doc comments from duplicate declarations once:
+            // In case of a union property there might be same declaration multiple times
+            // which only varies in type parameter
+            // Eg. const a: Array<string> | Array<number>; a.length
+            // The property length will have two declarations of property length coming
+            // from Array<T> - Array<string> and Array<number>
             var documentationComment = [];
             forEachUnique(declarations, function (declaration) {
                 for (var _i = 0, _a = getCommentHavingNodes(declaration); _i < _a.length; _i++) {
@@ -77228,17 +94429,18 @@ var ts;
         JsDoc.getJsDocCommentsFromDeclarations = getJsDocCommentsFromDeclarations;
         function getCommentHavingNodes(declaration) {
             switch (declaration.kind) {
-                case 293:
-                case 298:
+                case 293 /* JSDocParameterTag */:
+                case 298 /* JSDocPropertyTag */:
                     return [declaration];
-                case 292:
-                case 297:
+                case 292 /* JSDocCallbackTag */:
+                case 297 /* JSDocTypedefTag */:
                     return [declaration, declaration.parent];
                 default:
                     return ts.getJSDocCommentsAndTags(declaration);
             }
         }
         function getJsDocTagsFromDeclarations(declarations) {
+            // Only collect doc comments from duplicate declarations once.
             var tags = [];
             forEachUnique(declarations, function (declaration) {
                 for (var _i = 0, _a = ts.getJSDocTags(declaration); _i < _a.length; _i++) {
@@ -77252,16 +94454,16 @@ var ts;
         function getCommentText(tag) {
             var comment = tag.comment;
             switch (tag.kind) {
-                case 290:
+                case 290 /* JSDocAugmentsTag */:
                     return withNode(tag.class);
-                case 296:
+                case 296 /* JSDocTemplateTag */:
                     return withList(tag.typeParameters);
-                case 295:
+                case 295 /* JSDocTypeTag */:
                     return withNode(tag.typeExpression);
-                case 297:
-                case 292:
-                case 298:
-                case 293:
+                case 297 /* JSDocTypedefTag */:
+                case 292 /* JSDocCallbackTag */:
+                case 298 /* JSDocPropertyTag */:
+                case 293 /* JSDocParameterTag */:
                     var name = tag.name;
                     return name ? withNode(name) : comment;
                 default:
@@ -77277,6 +94479,11 @@ var ts;
                 return comment === undefined ? s : s + " " + comment;
             }
         }
+        /**
+         * Iterates through 'array' by index and performs the callback on each element of array until the callback
+         * returns a truthy value, then returns that value.
+         * If no such value is found, the callback is applied to each element of array and undefined is returned.
+         */
         function forEachUnique(array, callback) {
             if (array) {
                 for (var i = 0; i < array.length; i++) {
@@ -77294,7 +94501,7 @@ var ts;
             return jsDocTagNameCompletionEntries || (jsDocTagNameCompletionEntries = ts.map(jsDocTagNames, function (tagName) {
                 return {
                     name: tagName,
-                    kind: "keyword",
+                    kind: "keyword" /* keyword */,
                     kindModifiers: "",
                     sortText: "0",
                 };
@@ -77306,7 +94513,7 @@ var ts;
             return jsDocTagCompletionEntries || (jsDocTagCompletionEntries = ts.map(jsDocTagNames, function (tagName) {
                 return {
                     name: "@" + tagName,
-                    kind: "keyword",
+                    kind: "keyword" /* keyword */,
                     kindModifiers: "",
                     sortText: "0"
                 };
@@ -77316,7 +94523,7 @@ var ts;
         function getJSDocTagCompletionDetails(name) {
             return {
                 name: name,
-                kind: "",
+                kind: "" /* unknown */,
                 kindModifiers: "",
                 displayParts: [ts.textPart(name)],
                 documentation: ts.emptyArray,
@@ -77338,18 +94545,18 @@ var ts;
                 if (!ts.isIdentifier(param.name))
                     return undefined;
                 var name = param.name.text;
-                if (jsdoc.tags.some(function (t) { return t !== tag && ts.isJSDocParameterTag(t) && ts.isIdentifier(t.name) && t.name.escapedText === name; })
+                if (jsdoc.tags.some(function (t) { return t !== tag && ts.isJSDocParameterTag(t) && ts.isIdentifier(t.name) && t.name.escapedText === name; }) // TODO: GH#18217
                     || nameThusFar !== undefined && !ts.startsWith(name, nameThusFar)) {
                     return undefined;
                 }
-                return { name: name, kind: "parameter", kindModifiers: "", sortText: "0" };
+                return { name: name, kind: "parameter" /* parameterElement */, kindModifiers: "", sortText: "0" };
             });
         }
         JsDoc.getJSDocParameterNameCompletions = getJSDocParameterNameCompletions;
         function getJSDocParameterNameCompletionDetails(name) {
             return {
                 name: name,
-                kind: "parameter",
+                kind: "parameter" /* parameterElement */,
                 kindModifiers: "",
                 displayParts: [ts.textPart(name)],
                 documentation: ts.emptyArray,
@@ -77358,11 +94565,35 @@ var ts;
             };
         }
         JsDoc.getJSDocParameterNameCompletionDetails = getJSDocParameterNameCompletionDetails;
+        /**
+         * Checks if position points to a valid position to add JSDoc comments, and if so,
+         * returns the appropriate template. Otherwise returns an empty string.
+         * Valid positions are
+         *      - outside of comments, statements, and expressions, and
+         *      - preceding a:
+         *          - function/constructor/method declaration
+         *          - class declarations
+         *          - variable statements
+         *          - namespace declarations
+         *          - interface declarations
+         *          - method signatures
+         *          - type alias declarations
+         *
+         * Hosts should ideally check that:
+         * - The line is all whitespace up to 'position' before performing the insertion.
+         * - If the keystroke sequence "/\*\*" induced the call, we also check that the next
+         * non-whitespace character is '*', which (approximately) indicates whether we added
+         * the second '*' to complete an existing (JSDoc) comment.
+         * @param fileName The file in which to perform the check.
+         * @param position The (character-indexed) position in the file where the check should
+         * be performed.
+         */
         function getDocCommentTemplateAtPosition(newLine, sourceFile, position) {
+            // Check if in a context where we don't want to perform any insertion
             if (ts.isInString(sourceFile, position) || ts.isInComment(sourceFile, position) || ts.hasDocComment(sourceFile, position)) {
                 return undefined;
             }
-            var tokenAtPos = ts.getTokenAtPosition(sourceFile, position, false);
+            var tokenAtPos = ts.getTokenAtPosition(sourceFile, position, /*includeJsDocComment*/ false);
             var tokenStart = tokenAtPos.getStart(sourceFile);
             if (!tokenAtPos || tokenStart < position) {
                 return undefined;
@@ -77376,12 +94607,21 @@ var ts;
                 return undefined;
             }
             if (!parameters || parameters.length === 0) {
+                // if there are no parameters, just complete to a single line JSDoc comment
                 var singleLineResult = "/** */";
                 return { newText: singleLineResult, caretOffset: 3 };
             }
             var posLineAndChar = sourceFile.getLineAndCharacterOfPosition(position);
             var lineStart = sourceFile.getLineStarts()[posLineAndChar.line];
+            // replace non-whitespace characters in prefix with spaces.
             var indentationStr = sourceFile.text.substr(lineStart, posLineAndChar.character).replace(/\S/i, function () { return " "; });
+            // A doc comment consists of the following
+            // * The opening comment line
+            // * the first line (without a param) for the object's untagged info (this is also where the caret ends up)
+            // * the '@param'-tagged lines
+            // * TODO: other tags.
+            // * the closing comment line
+            // * if the caret was directly in front of the object, then we add an extra line and indentation.
             var preamble = "/**" + newLine +
                 indentationStr + " * ";
             var result = preamble + newLine +
@@ -77394,7 +94634,7 @@ var ts;
         function parameterDocComments(parameters, isJavaScriptFile, indentationStr, newLine) {
             return parameters.map(function (_a, i) {
                 var name = _a.name, dotDotDotToken = _a.dotDotDotToken;
-                var paramName = name.kind === 71 ? name.text : "param" + i;
+                var paramName = name.kind === 71 /* Identifier */ ? name.text : "param" + i;
                 var type = isJavaScriptFile ? (dotDotDotToken ? "{...any} " : "{any} ") : "";
                 return indentationStr + " * @param " + type + paramName + newLine;
             }).join("");
@@ -77402,20 +94642,20 @@ var ts;
         function getCommentOwnerInfo(tokenAtPos) {
             for (var commentOwner = tokenAtPos; commentOwner; commentOwner = commentOwner.parent) {
                 switch (commentOwner.kind) {
-                    case 234:
-                    case 154:
-                    case 155:
-                    case 153:
+                    case 234 /* FunctionDeclaration */:
+                    case 154 /* MethodDeclaration */:
+                    case 155 /* Constructor */:
+                    case 153 /* MethodSignature */:
                         var parameters = commentOwner.parameters;
                         return { commentOwner: commentOwner, parameters: parameters };
-                    case 235:
-                    case 236:
-                    case 151:
-                    case 238:
-                    case 273:
-                    case 237:
+                    case 235 /* ClassDeclaration */:
+                    case 236 /* InterfaceDeclaration */:
+                    case 151 /* PropertySignature */:
+                    case 238 /* EnumDeclaration */:
+                    case 273 /* EnumMember */:
+                    case 237 /* TypeAliasDeclaration */:
                         return { commentOwner: commentOwner };
-                    case 214: {
+                    case 214 /* VariableStatement */: {
                         var varStatement = commentOwner;
                         var varDeclarations = varStatement.declarationList.declarations;
                         var parameters_1 = varDeclarations.length === 1 && varDeclarations[0].initializer
@@ -77423,13 +94663,16 @@ var ts;
                             : undefined;
                         return { commentOwner: commentOwner, parameters: parameters_1 };
                     }
-                    case 274:
+                    case 274 /* SourceFile */:
                         return undefined;
-                    case 239:
-                        return commentOwner.parent.kind === 239 ? undefined : { commentOwner: commentOwner };
-                    case 200: {
+                    case 239 /* ModuleDeclaration */:
+                        // If in walking up the tree, we hit a a nested namespace declaration,
+                        // then we must be somewhere within a dotted namespace name; however we don't
+                        // want to give back a JSDoc template for the 'b' or 'c' in 'namespace a.b.c { }'.
+                        return commentOwner.parent.kind === 239 /* ModuleDeclaration */ ? undefined : { commentOwner: commentOwner };
+                    case 200 /* BinaryExpression */: {
                         var be = commentOwner;
-                        if (ts.getSpecialPropertyAssignmentKind(be) === 0) {
+                        if (ts.getSpecialPropertyAssignmentKind(be) === 0 /* None */) {
                             return undefined;
                         }
                         var parameters_2 = ts.isFunctionLike(be.right) ? be.right.parameters : ts.emptyArray;
@@ -77438,15 +94681,23 @@ var ts;
                 }
             }
         }
+        /**
+         * Digs into an an initializer or RHS operand of an assignment operation
+         * to get the parameters of an apt signature corresponding to a
+         * function expression or a class expression.
+         *
+         * @param rightHandSide the expression which may contain an appropriate set of parameters
+         * @returns the parameters of a signature found on the RHS if one exists; otherwise 'emptyArray'.
+         */
         function getParametersFromRightHandSideOfAssignment(rightHandSide) {
-            while (rightHandSide.kind === 191) {
+            while (rightHandSide.kind === 191 /* ParenthesizedExpression */) {
                 rightHandSide = rightHandSide.expression;
             }
             switch (rightHandSide.kind) {
-                case 192:
-                case 193:
+                case 192 /* FunctionExpression */:
+                case 193 /* ArrowFunction */:
                     return rightHandSide.parameters;
-                case 205: {
+                case 205 /* ClassExpression */: {
                     var ctr = ts.find(rightHandSide.members, ts.isConstructorDeclaration);
                     return ctr ? ctr.parameters : ts.emptyArray;
                 }
@@ -77455,314 +94706,7 @@ var ts;
         }
     })(JsDoc = ts.JsDoc || (ts.JsDoc = {}));
 })(ts || (ts = {}));
-var ts;
-(function (ts) {
-    function stringToInt(str) {
-        var n = parseInt(str, 10);
-        if (isNaN(n)) {
-            throw new Error("Error in parseInt(" + JSON.stringify(str) + ")");
-        }
-        return n;
-    }
-    var isPrereleaseRegex = /^(.*)-next.\d+/;
-    var prereleaseSemverRegex = /^(\d+)\.(\d+)\.0-next.(\d+)$/;
-    var semverRegex = /^(\d+)\.(\d+)\.(\d+)$/;
-    var Semver = (function () {
-        function Semver(major, minor, patch, isPrerelease) {
-            this.major = major;
-            this.minor = minor;
-            this.patch = patch;
-            this.isPrerelease = isPrerelease;
-        }
-        Semver.parse = function (semver) {
-            var isPrerelease = isPrereleaseRegex.test(semver);
-            var result = Semver.tryParse(semver, isPrerelease);
-            if (!result) {
-                throw new Error("Unexpected semver: " + semver + " (isPrerelease: " + isPrerelease + ")");
-            }
-            return result;
-        };
-        Semver.fromRaw = function (_a) {
-            var major = _a.major, minor = _a.minor, patch = _a.patch, isPrerelease = _a.isPrerelease;
-            return new Semver(major, minor, patch, isPrerelease);
-        };
-        Semver.tryParse = function (semver, isPrerelease) {
-            var rgx = isPrerelease ? prereleaseSemverRegex : semverRegex;
-            var match = rgx.exec(semver);
-            return match ? new Semver(stringToInt(match[1]), stringToInt(match[2]), stringToInt(match[3]), isPrerelease) : undefined;
-        };
-        Object.defineProperty(Semver.prototype, "versionString", {
-            get: function () {
-                return this.isPrerelease ? this.major + "." + this.minor + ".0-next." + this.patch : this.major + "." + this.minor + "." + this.patch;
-            },
-            enumerable: true,
-            configurable: true
-        });
-        Semver.prototype.equals = function (sem) {
-            return this.major === sem.major && this.minor === sem.minor && this.patch === sem.patch && this.isPrerelease === sem.isPrerelease;
-        };
-        Semver.prototype.greaterThan = function (sem) {
-            return this.major > sem.major || this.major === sem.major
-                && (this.minor > sem.minor || this.minor === sem.minor
-                    && (!this.isPrerelease && sem.isPrerelease || this.isPrerelease === sem.isPrerelease
-                        && this.patch > sem.patch));
-        };
-        return Semver;
-    }());
-    ts.Semver = Semver;
-})(ts || (ts = {}));
-var ts;
-(function (ts) {
-    var JsTyping;
-    (function (JsTyping) {
-        function isTypingUpToDate(cachedTyping, availableTypingVersions) {
-            var availableVersion = ts.Semver.parse(ts.getProperty(availableTypingVersions, "ts" + ts.versionMajorMinor) || ts.getProperty(availableTypingVersions, "latest"));
-            return !availableVersion.greaterThan(cachedTyping.version);
-        }
-        JsTyping.isTypingUpToDate = isTypingUpToDate;
-        JsTyping.nodeCoreModuleList = [
-            "assert",
-            "async_hooks",
-            "buffer",
-            "child_process",
-            "cluster",
-            "console",
-            "constants",
-            "crypto",
-            "dgram",
-            "dns",
-            "domain",
-            "events",
-            "fs",
-            "http",
-            "https",
-            "http2",
-            "inspector",
-            "net",
-            "os",
-            "path",
-            "perf_hooks",
-            "process",
-            "punycode",
-            "querystring",
-            "readline",
-            "repl",
-            "stream",
-            "string_decoder",
-            "timers",
-            "tls",
-            "tty",
-            "url",
-            "util",
-            "v8",
-            "vm",
-            "zlib"
-        ];
-        JsTyping.nodeCoreModules = ts.arrayToSet(JsTyping.nodeCoreModuleList);
-        function loadSafeList(host, safeListPath) {
-            var result = ts.readConfigFile(safeListPath, function (path) { return host.readFile(path); });
-            return ts.createMapFromTemplate(result.config);
-        }
-        JsTyping.loadSafeList = loadSafeList;
-        function loadTypesMap(host, typesMapPath) {
-            var result = ts.readConfigFile(typesMapPath, function (path) { return host.readFile(path); });
-            if (result.config) {
-                return ts.createMapFromTemplate(result.config.simpleMap);
-            }
-            return undefined;
-        }
-        JsTyping.loadTypesMap = loadTypesMap;
-        function discoverTypings(host, log, fileNames, projectRootPath, safeList, packageNameToTypingLocation, typeAcquisition, unresolvedImports, typesRegistry) {
-            if (!typeAcquisition || !typeAcquisition.enable) {
-                return { cachedTypingPaths: [], newTypingNames: [], filesToWatch: [] };
-            }
-            var inferredTypings = ts.createMap();
-            fileNames = ts.mapDefined(fileNames, function (fileName) {
-                var path = ts.normalizePath(fileName);
-                if (ts.hasJavaScriptFileExtension(path)) {
-                    return path;
-                }
-            });
-            var filesToWatch = [];
-            if (typeAcquisition.include)
-                addInferredTypings(typeAcquisition.include, "Explicitly included types");
-            var exclude = typeAcquisition.exclude || [];
-            var possibleSearchDirs = ts.arrayToSet(fileNames, ts.getDirectoryPath);
-            possibleSearchDirs.set(projectRootPath, true);
-            possibleSearchDirs.forEach(function (_true, searchDir) {
-                var packageJsonPath = ts.combinePaths(searchDir, "package.json");
-                getTypingNamesFromJson(packageJsonPath, filesToWatch);
-                var bowerJsonPath = ts.combinePaths(searchDir, "bower.json");
-                getTypingNamesFromJson(bowerJsonPath, filesToWatch);
-                var bowerComponentsPath = ts.combinePaths(searchDir, "bower_components");
-                getTypingNamesFromPackagesFolder(bowerComponentsPath, filesToWatch);
-                var nodeModulesPath = ts.combinePaths(searchDir, "node_modules");
-                getTypingNamesFromPackagesFolder(nodeModulesPath, filesToWatch);
-            });
-            getTypingNamesFromSourceFileNames(fileNames);
-            if (unresolvedImports) {
-                var module_1 = ts.deduplicate(unresolvedImports.map(function (moduleId) { return JsTyping.nodeCoreModules.has(moduleId) ? "node" : moduleId; }), ts.equateStringsCaseSensitive, ts.compareStringsCaseSensitive);
-                addInferredTypings(module_1, "Inferred typings from unresolved imports");
-            }
-            packageNameToTypingLocation.forEach(function (typing, name) {
-                var registryEntry = typesRegistry.get(name);
-                if (inferredTypings.has(name) && inferredTypings.get(name) === undefined && registryEntry !== undefined && isTypingUpToDate(typing, registryEntry)) {
-                    inferredTypings.set(name, typing.typingLocation);
-                }
-            });
-            for (var _i = 0, exclude_1 = exclude; _i < exclude_1.length; _i++) {
-                var excludeTypingName = exclude_1[_i];
-                var didDelete = inferredTypings.delete(excludeTypingName);
-                if (didDelete && log)
-                    log("Typing for " + excludeTypingName + " is in exclude list, will be ignored.");
-            }
-            var newTypingNames = [];
-            var cachedTypingPaths = [];
-            inferredTypings.forEach(function (inferred, typing) {
-                if (inferred !== undefined) {
-                    cachedTypingPaths.push(inferred);
-                }
-                else {
-                    newTypingNames.push(typing);
-                }
-            });
-            var result = { cachedTypingPaths: cachedTypingPaths, newTypingNames: newTypingNames, filesToWatch: filesToWatch };
-            if (log)
-                log("Result: " + JSON.stringify(result));
-            return result;
-            function addInferredTyping(typingName) {
-                if (!inferredTypings.has(typingName)) {
-                    inferredTypings.set(typingName, undefined);
-                }
-            }
-            function addInferredTypings(typingNames, message) {
-                if (log)
-                    log(message + ": " + JSON.stringify(typingNames));
-                ts.forEach(typingNames, addInferredTyping);
-            }
-            function getTypingNamesFromJson(jsonPath, filesToWatch) {
-                if (!host.fileExists(jsonPath)) {
-                    return;
-                }
-                filesToWatch.push(jsonPath);
-                var jsonConfig = ts.readConfigFile(jsonPath, function (path) { return host.readFile(path); }).config;
-                var jsonTypingNames = ts.flatMap([jsonConfig.dependencies, jsonConfig.devDependencies, jsonConfig.optionalDependencies, jsonConfig.peerDependencies], ts.getOwnKeys);
-                addInferredTypings(jsonTypingNames, "Typing names in '" + jsonPath + "' dependencies");
-            }
-            function getTypingNamesFromSourceFileNames(fileNames) {
-                var fromFileNames = ts.mapDefined(fileNames, function (j) {
-                    if (!ts.hasJavaScriptFileExtension(j))
-                        return undefined;
-                    var inferredTypingName = ts.removeFileExtension(ts.getBaseFileName(j.toLowerCase()));
-                    var cleanedTypingName = ts.removeMinAndVersionNumbers(inferredTypingName);
-                    return safeList.get(cleanedTypingName);
-                });
-                if (fromFileNames.length) {
-                    addInferredTypings(fromFileNames, "Inferred typings from file names");
-                }
-                var hasJsxFile = ts.some(fileNames, function (f) { return ts.fileExtensionIs(f, ".jsx"); });
-                if (hasJsxFile) {
-                    if (log)
-                        log("Inferred 'react' typings due to presence of '.jsx' extension");
-                    addInferredTyping("react");
-                }
-            }
-            function getTypingNamesFromPackagesFolder(packagesFolderPath, filesToWatch) {
-                filesToWatch.push(packagesFolderPath);
-                if (!host.directoryExists(packagesFolderPath)) {
-                    return;
-                }
-                var fileNames = host.readDirectory(packagesFolderPath, [".json"], undefined, undefined, 2);
-                if (log)
-                    log("Searching for typing names in " + packagesFolderPath + "; all files: " + JSON.stringify(fileNames));
-                var packageNames = [];
-                for (var _i = 0, fileNames_1 = fileNames; _i < fileNames_1.length; _i++) {
-                    var fileName = fileNames_1[_i];
-                    var normalizedFileName = ts.normalizePath(fileName);
-                    var baseFileName = ts.getBaseFileName(normalizedFileName);
-                    if (baseFileName !== "package.json" && baseFileName !== "bower.json") {
-                        continue;
-                    }
-                    var result_6 = ts.readConfigFile(normalizedFileName, function (path) { return host.readFile(path); });
-                    var packageJson = result_6.config;
-                    if (baseFileName === "package.json" && packageJson._requiredBy &&
-                        ts.filter(packageJson._requiredBy, function (r) { return r[0] === "#" || r === "/"; }).length === 0) {
-                        continue;
-                    }
-                    if (!packageJson.name) {
-                        continue;
-                    }
-                    var ownTypes = packageJson.types || packageJson.typings;
-                    if (ownTypes) {
-                        var absolutePath = ts.getNormalizedAbsolutePath(ownTypes, ts.getDirectoryPath(normalizedFileName));
-                        if (log)
-                            log("    Package '" + packageJson.name + "' provides its own types.");
-                        inferredTypings.set(packageJson.name, absolutePath);
-                    }
-                    else {
-                        packageNames.push(packageJson.name);
-                    }
-                }
-                addInferredTypings(packageNames, "    Found package names");
-            }
-        }
-        JsTyping.discoverTypings = discoverTypings;
-        var PackageNameValidationResult;
-        (function (PackageNameValidationResult) {
-            PackageNameValidationResult[PackageNameValidationResult["Ok"] = 0] = "Ok";
-            PackageNameValidationResult[PackageNameValidationResult["ScopedPackagesNotSupported"] = 1] = "ScopedPackagesNotSupported";
-            PackageNameValidationResult[PackageNameValidationResult["EmptyName"] = 2] = "EmptyName";
-            PackageNameValidationResult[PackageNameValidationResult["NameTooLong"] = 3] = "NameTooLong";
-            PackageNameValidationResult[PackageNameValidationResult["NameStartsWithDot"] = 4] = "NameStartsWithDot";
-            PackageNameValidationResult[PackageNameValidationResult["NameStartsWithUnderscore"] = 5] = "NameStartsWithUnderscore";
-            PackageNameValidationResult[PackageNameValidationResult["NameContainsNonURISafeCharacters"] = 6] = "NameContainsNonURISafeCharacters";
-        })(PackageNameValidationResult = JsTyping.PackageNameValidationResult || (JsTyping.PackageNameValidationResult = {}));
-        var maxPackageNameLength = 214;
-        function validatePackageName(packageName) {
-            if (!packageName) {
-                return 2;
-            }
-            if (packageName.length > maxPackageNameLength) {
-                return 3;
-            }
-            if (packageName.charCodeAt(0) === 46) {
-                return 4;
-            }
-            if (packageName.charCodeAt(0) === 95) {
-                return 5;
-            }
-            if (/^@[^/]+\/[^/]+$/.test(packageName)) {
-                return 1;
-            }
-            if (encodeURIComponent(packageName) !== packageName) {
-                return 6;
-            }
-            return 0;
-        }
-        JsTyping.validatePackageName = validatePackageName;
-        function renderPackageNameValidationFailure(result, typing) {
-            switch (result) {
-                case 2:
-                    return "Package name '" + typing + "' cannot be empty";
-                case 3:
-                    return "Package name '" + typing + "' should be less than " + maxPackageNameLength + " characters";
-                case 4:
-                    return "Package name '" + typing + "' cannot start with '.'";
-                case 5:
-                    return "Package name '" + typing + "' cannot start with '_'";
-                case 1:
-                    return "Package '" + typing + "' is scoped and currently is not supported";
-                case 6:
-                    return "Package name '" + typing + "' contains non URI safe characters";
-                case 0:
-                    return ts.Debug.fail();
-                default:
-                    throw ts.Debug.assertNever(result);
-            }
-        }
-        JsTyping.renderPackageNameValidationFailure = renderPackageNameValidationFailure;
-    })(JsTyping = ts.JsTyping || (ts.JsTyping = {}));
-})(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var NavigateTo;
@@ -77772,18 +94716,19 @@ var ts;
             if (!patternMatcher)
                 return ts.emptyArray;
             var rawItems = [];
-            var _loop_15 = function (sourceFile) {
+            var _loop_4 = function (sourceFile) {
                 cancellationToken.throwIfCancellationRequested();
-                if (excludeDtsFiles && ts.fileExtensionIs(sourceFile.fileName, ".d.ts")) {
+                if (excludeDtsFiles && ts.fileExtensionIs(sourceFile.fileName, ".d.ts" /* Dts */)) {
                     return "continue";
                 }
                 sourceFile.getNamedDeclarations().forEach(function (declarations, name) {
                     getItemsFromNamedDeclaration(patternMatcher, name, declarations, checker, sourceFile.fileName, rawItems);
                 });
             };
-            for (var _i = 0, sourceFiles_7 = sourceFiles; _i < sourceFiles_7.length; _i++) {
-                var sourceFile = sourceFiles_7[_i];
-                _loop_15(sourceFile);
+            // Search the declarations in all files and output matched NavigateToItem into array of NavigateToItem[]
+            for (var _i = 0, sourceFiles_3 = sourceFiles; _i < sourceFiles_3.length; _i++) {
+                var sourceFile = sourceFiles_3[_i];
+                _loop_4(sourceFile);
             }
             rawItems.sort(compareNavigateToItems);
             if (maxResultCount !== undefined) {
@@ -77793,30 +94738,33 @@ var ts;
         }
         NavigateTo.getNavigateToItems = getNavigateToItems;
         function getItemsFromNamedDeclaration(patternMatcher, name, declarations, checker, fileName, rawItems) {
+            // First do a quick check to see if the name of the declaration matches the
+            // last portion of the (possibly) dotted name they're searching for.
             var match = patternMatcher.getMatchForLastSegmentOfPattern(name);
             if (!match) {
-                return;
+                return; // continue to next named declarations
             }
-            for (var _i = 0, declarations_12 = declarations; _i < declarations_12.length; _i++) {
-                var declaration = declarations_12[_i];
+            for (var _i = 0, declarations_3 = declarations; _i < declarations_3.length; _i++) {
+                var declaration = declarations_3[_i];
                 if (!shouldKeepItem(declaration, checker))
                     continue;
                 if (patternMatcher.patternContainsDots) {
-                    var fullMatch = patternMatcher.getFullMatch(getContainers(declaration), name);
+                    var fullMatch = patternMatcher.getFullMatch(getContainers(declaration), name); // TODO: GH#18217
                     if (fullMatch) {
                         rawItems.push({ name: name, fileName: fileName, matchKind: fullMatch.kind, isCaseSensitive: fullMatch.isCaseSensitive, declaration: declaration });
                     }
                 }
                 else {
+                    // If the pattern has dots in it, then also see if the declaration container matches as well.
                     rawItems.push({ name: name, fileName: fileName, matchKind: match.kind, isCaseSensitive: match.isCaseSensitive, declaration: declaration });
                 }
             }
         }
         function shouldKeepItem(declaration, checker) {
             switch (declaration.kind) {
-                case 245:
-                case 248:
-                case 243:
+                case 245 /* ImportClause */:
+                case 248 /* ImportSpecifier */:
+                case 243 /* ImportEqualsDeclaration */:
                     var importer = checker.getSymbolAtLocation(declaration.name);
                     var imported = checker.getAliasedSymbol(importer);
                     return importer.escapedName !== imported.escapedName;
@@ -77830,13 +94778,17 @@ var ts;
                 containers.unshift(ts.getTextOfIdentifierOrLiteral(name));
                 return true;
             }
-            else if (name && name.kind === 147) {
-                return tryAddComputedPropertyName(name.expression, containers, true);
+            else if (name && name.kind === 147 /* ComputedPropertyName */) {
+                return tryAddComputedPropertyName(name.expression, containers, /*includeLastPortion*/ true);
             }
             else {
+                // Don't know how to add this.
                 return false;
             }
         }
+        // Only added the names of computed properties if they're simple dotted expressions, like:
+        //
+        //      [X.Y.Z]() { }
         function tryAddComputedPropertyName(expression, containers, includeLastPortion) {
             if (ts.isPropertyNameLiteral(expression)) {
                 var text = ts.getTextOfIdentifierOrLiteral(expression);
@@ -77849,16 +94801,19 @@ var ts;
                 if (includeLastPortion) {
                     containers.unshift(expression.name.text);
                 }
-                return tryAddComputedPropertyName(expression.expression, containers, true);
+                return tryAddComputedPropertyName(expression.expression, containers, /*includeLastPortion*/ true);
             }
             return false;
         }
         function getContainers(declaration) {
             var containers = [];
+            // First, if we started with a computed property name, then add all but the last
+            // portion into the container array.
             var name = ts.getNameOfDeclaration(declaration);
-            if (name.kind === 147 && !tryAddComputedPropertyName(name.expression, containers, false)) {
+            if (name.kind === 147 /* ComputedPropertyName */ && !tryAddComputedPropertyName(name.expression, containers, /*includeLastPortion*/ false)) {
                 return undefined;
             }
+            // Now, walk up our containers, adding all their names to the container array.
             var container = ts.getContainerNode(declaration);
             while (container) {
                 if (!tryAddSingleDeclarationName(container, containers)) {
@@ -77869,6 +94824,7 @@ var ts;
             return containers;
         }
         function compareNavigateToItems(i1, i2) {
+            // TODO(cyrusn): get the gamut of comparisons that VS already uses here.
             return ts.compareValues(i1.matchKind, i2.matchKind)
                 || ts.compareStringsCaseSensitiveUI(i1.name, i2.name);
         }
@@ -77884,21 +94840,43 @@ var ts;
                 isCaseSensitive: rawItem.isCaseSensitive,
                 fileName: rawItem.fileName,
                 textSpan: ts.createTextSpanFromNode(declaration),
+                // TODO(jfreeman): What should be the containerName when the container has a computed name?
                 containerName: containerName ? containerName.text : "",
-                containerKind: containerName ? ts.getNodeKind(container) : ""
+                containerKind: containerName ? ts.getNodeKind(container) : "" /* unknown */ // TODO: GH#18217 Just use `container ? ...`
             };
         }
     })(NavigateTo = ts.NavigateTo || (ts.NavigateTo = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var NavigationBar;
     (function (NavigationBar) {
+        /**
+         * Matches all whitespace characters in a string. Eg:
+         *
+         * "app.
+         *
+         * onactivated"
+         *
+         * matches because of the newline, whereas
+         *
+         * "app.onactivated"
+         *
+         * does not match.
+         */
         var whiteSpaceRegex = /\s+/g;
+        // Keep sourceFile handy so we don't have to search for it every time we need to call `getText`.
         var curCancellationToken;
         var curSourceFile;
+        /**
+         * For performance, we keep navigation bar parents on a stack rather than passing them through each recursion.
+         * `parent` is the current parent and is *not* stored in parentsStack.
+         * `startNode` sets a new parent and `endNode` returns to the previous parent.
+         */
         var parentsStack = [];
         var parent;
+        // NavigationBarItem requires an array, but will not mutate it, so just give it this for performance.
         var emptyChildItemArray = [];
         function getNavigationBarItems(sourceFile, cancellationToken) {
             curCancellationToken = cancellationToken;
@@ -77945,7 +94923,7 @@ var ts;
         }
         function rootNavigationBarNode(sourceFile) {
             ts.Debug.assert(!parentsStack.length);
-            var root = { node: sourceFile, additionalNodes: undefined, parent: undefined, children: undefined, indent: 0 };
+            var root = { node: sourceFile, name: undefined, additionalNodes: undefined, parent: undefined, children: undefined, indent: 0 };
             parent = root;
             for (var _i = 0, _a = sourceFile.statements; _i < _a.length; _i++) {
                 var statement = _a[_i];
@@ -77961,18 +94939,25 @@ var ts;
         function emptyNavigationBarNode(node) {
             return {
                 node: node,
+                name: ts.isDeclaration(node) || ts.isExpression(node) ? ts.getNameOfDeclaration(node) : undefined,
                 additionalNodes: undefined,
                 parent: parent,
                 children: undefined,
                 indent: parent.indent + 1
             };
         }
+        /**
+         * Add a new level of NavigationBarNodes.
+         * This pushes to the stack, so you must call `endNode` when you are done adding to this node.
+         */
         function startNode(node) {
             var navNode = emptyNavigationBarNode(node);
             pushChild(parent, navNode);
+            // Save the old parent
             parentsStack.push(parent);
             parent = navNode;
         }
+        /** Call after calling `startNode` and adding children to it. */
         function endNode() {
             if (parent.children) {
                 mergeChildren(parent.children);
@@ -77985,15 +94970,18 @@ var ts;
             addChildrenRecursively(child);
             endNode();
         }
+        /** Look for navigation bar items in node's subtree, adding them to the current `parent`. */
         function addChildrenRecursively(node) {
             curCancellationToken.throwIfCancellationRequested();
             if (!node || ts.isToken(node)) {
                 return;
             }
             switch (node.kind) {
-                case 155:
+                case 155 /* Constructor */:
+                    // Get parameter properties, and treat them as being on the *same* level as the constructor, not under it.
                     var ctr = node;
                     addNodeWithRecursiveChild(ctr, ctr.body);
+                    // Parameter properties are children of the class, not the constructor.
                     for (var _i = 0, _a = ctr.parameters; _i < _a.length; _i++) {
                         var param = _a[_i];
                         if (ts.isParameterPropertyDeclaration(param)) {
@@ -78001,28 +94989,33 @@ var ts;
                         }
                     }
                     break;
-                case 154:
-                case 156:
-                case 157:
-                case 153:
+                case 154 /* MethodDeclaration */:
+                case 156 /* GetAccessor */:
+                case 157 /* SetAccessor */:
+                case 153 /* MethodSignature */:
                     if (!ts.hasDynamicName(node)) {
                         addNodeWithRecursiveChild(node, node.body);
                     }
                     break;
-                case 152:
-                case 151:
+                case 152 /* PropertyDeclaration */:
+                case 151 /* PropertySignature */:
                     if (!ts.hasDynamicName(node)) {
                         addLeafNode(node);
                     }
                     break;
-                case 245:
+                case 245 /* ImportClause */:
                     var importClause = node;
+                    // Handle default import case e.g.:
+                    //    import d from "mod";
                     if (importClause.name) {
                         addLeafNode(importClause);
                     }
+                    // Handle named bindings in imports e.g.:
+                    //    import * as NS from "mod";
+                    //    import {a, b as B} from "mod";
                     var namedBindings = importClause.namedBindings;
                     if (namedBindings) {
-                        if (namedBindings.kind === 246) {
+                        if (namedBindings.kind === 246 /* NamespaceImport */) {
                             addLeafNode(namedBindings);
                         }
                         else {
@@ -78033,17 +95026,19 @@ var ts;
                         }
                     }
                     break;
-                case 182:
-                case 232:
+                case 182 /* BindingElement */:
+                case 232 /* VariableDeclaration */:
                     var _d = node, name = _d.name, initializer = _d.initializer;
                     if (ts.isBindingPattern(name)) {
                         addChildrenRecursively(name);
                     }
                     else if (initializer && isFunctionOrClassExpression(initializer)) {
                         if (initializer.name) {
+                            // Don't add a node for the VariableDeclaration, just for the initializer.
                             addChildrenRecursively(initializer);
                         }
                         else {
+                            // Add a node for the VariableDeclaration, but not for the initializer.
                             startNode(node);
                             ts.forEachChild(initializer, addChildrenRecursively);
                             endNode();
@@ -78053,12 +95048,12 @@ var ts;
                         addNodeWithRecursiveChild(node, initializer);
                     }
                     break;
-                case 193:
-                case 234:
-                case 192:
+                case 193 /* ArrowFunction */:
+                case 234 /* FunctionDeclaration */:
+                case 192 /* FunctionExpression */:
                     addNodeWithRecursiveChild(node, node.body);
                     break;
-                case 238:
+                case 238 /* EnumDeclaration */:
                     startNode(node);
                     for (var _e = 0, _f = node.members; _e < _f.length; _e++) {
                         var member = _f[_e];
@@ -78068,9 +95063,9 @@ var ts;
                     }
                     endNode();
                     break;
-                case 235:
-                case 205:
-                case 236:
+                case 235 /* ClassDeclaration */:
+                case 205 /* ClassExpression */:
+                case 236 /* InterfaceDeclaration */:
                     startNode(node);
                     for (var _g = 0, _h = node.members; _g < _h.length; _g++) {
                         var member = _h[_g];
@@ -78078,34 +95073,35 @@ var ts;
                     }
                     endNode();
                     break;
-                case 239:
+                case 239 /* ModuleDeclaration */:
                     addNodeWithRecursiveChild(node, getInteriorModule(node).body);
                     break;
-                case 252:
-                case 243:
-                case 160:
-                case 158:
-                case 159:
-                case 237:
+                case 252 /* ExportSpecifier */:
+                case 243 /* ImportEqualsDeclaration */:
+                case 160 /* IndexSignature */:
+                case 158 /* CallSignature */:
+                case 159 /* ConstructSignature */:
+                case 237 /* TypeAliasDeclaration */:
                     addLeafNode(node);
                     break;
-                case 200: {
+                case 200 /* BinaryExpression */: {
                     var special = ts.getSpecialPropertyAssignmentKind(node);
                     switch (special) {
-                        case 1:
-                        case 2:
-                        case 3:
-                        case 6:
+                        case 1 /* ExportsProperty */:
+                        case 2 /* ModuleExports */:
+                        case 3 /* PrototypeProperty */:
+                        case 6 /* Prototype */:
                             addNodeWithRecursiveChild(node, node.right);
                             break;
-                        case 4:
-                        case 5:
-                        case 0:
+                        case 4 /* ThisProperty */:
+                        case 5 /* Property */:
+                        case 0 /* None */:
                             break;
                         default:
                             ts.Debug.assertNever(special);
                     }
                 }
+                // falls through
                 default:
                     if (ts.hasJSDocNodes(node)) {
                         ts.forEach(node.jsDoc, function (jsDoc) {
@@ -78119,12 +95115,14 @@ var ts;
                     ts.forEachChild(node, addChildrenRecursively);
             }
         }
+        /** Merge declarations of the same kind. */
         function mergeChildren(children) {
             var nameToItems = ts.createMap();
             ts.filterMutate(children, function (child) {
                 var declName = ts.getNameOfDeclaration(child.node);
                 var name = declName && nodeText(declName);
                 if (!name) {
+                    // Anonymous items are never merged.
                     return true;
                 }
                 var itemsWithSameName = nameToItems.get(name);
@@ -78159,25 +95157,30 @@ var ts;
             }
             return false;
         }
+        /** a and b have the same name, but they may not be mergeable. */
         function shouldReallyMerge(a, b) {
             if (a.kind !== b.kind) {
                 return false;
             }
             switch (a.kind) {
-                case 152:
-                case 154:
-                case 156:
-                case 157:
-                    return ts.hasModifier(a, 32) === ts.hasModifier(b, 32);
-                case 239:
+                case 152 /* PropertyDeclaration */:
+                case 154 /* MethodDeclaration */:
+                case 156 /* GetAccessor */:
+                case 157 /* SetAccessor */:
+                    return ts.hasModifier(a, 32 /* Static */) === ts.hasModifier(b, 32 /* Static */);
+                case 239 /* ModuleDeclaration */:
                     return areSameModule(a, b);
                 default:
                     return true;
             }
         }
+        // We use 1 NavNode to represent 'A.B.C', but there are multiple source nodes.
+        // Only merge module nodes that have the same chain. Don't merge 'A.B.C' with 'A'!
         function areSameModule(a, b) {
-            return a.body.kind === b.body.kind && (a.body.kind !== 239 || areSameModule(a.body, b.body));
+            // TODO: GH#18217
+            return a.body.kind === b.body.kind && (a.body.kind !== 239 /* ModuleDeclaration */ || areSameModule(a.body, b.body));
         }
+        /** Merge source into target. Source should be thrown away after this is called. */
         function merge(target, source) {
             var _a;
             target.additionalNodes = target.additionalNodes || [];
@@ -78191,35 +95194,40 @@ var ts;
                 sortChildren(target.children);
             }
         }
+        /** Recursively ensure that each NavNode's children are in sorted order. */
         function sortChildren(children) {
             children.sort(compareChildren);
         }
         function compareChildren(child1, child2) {
-            return ts.compareStringsCaseSensitiveUI(tryGetName(child1.node), tryGetName(child2.node))
+            return ts.compareStringsCaseSensitiveUI(tryGetName(child1.node), tryGetName(child2.node)) // TODO: GH#18217
                 || ts.compareValues(navigationBarNodeKind(child1), navigationBarNodeKind(child2));
         }
+        /**
+         * This differs from getItemName because this is just used for sorting.
+         * We only sort nodes by name that have a more-or-less "direct" name, as opposed to `new()` and the like.
+         * So `new()` can still come before an `aardvark` method.
+         */
         function tryGetName(node) {
-            if (node.kind === 239) {
+            if (node.kind === 239 /* ModuleDeclaration */) {
                 return getModuleName(node);
             }
             var declName = ts.getNameOfDeclaration(node);
             if (declName) {
-                return ts.unescapeLeadingUnderscores(ts.getPropertyNameForPropertyNameNode(declName));
+                return ts.unescapeLeadingUnderscores(ts.getPropertyNameForPropertyNameNode(declName)); // TODO: GH#18217
             }
             switch (node.kind) {
-                case 192:
-                case 193:
-                case 205:
+                case 192 /* FunctionExpression */:
+                case 193 /* ArrowFunction */:
+                case 205 /* ClassExpression */:
                     return getFunctionOrClassName(node);
                 default:
                     return undefined;
             }
         }
-        function getItemName(node) {
-            if (node.kind === 239) {
+        function getItemName(node, name) {
+            if (node.kind === 239 /* ModuleDeclaration */) {
                 return getModuleName(node);
             }
-            var name = ts.getNameOfDeclaration(node);
             if (name) {
                 var text = nodeText(name);
                 if (text.length > 0) {
@@ -78227,32 +95235,36 @@ var ts;
                 }
             }
             switch (node.kind) {
-                case 274:
+                case 274 /* SourceFile */:
                     var sourceFile = node;
                     return ts.isExternalModule(sourceFile)
                         ? "\"" + ts.escapeString(ts.getBaseFileName(ts.removeFileExtension(ts.normalizePath(sourceFile.fileName)))) + "\""
                         : "<global>";
-                case 193:
-                case 234:
-                case 192:
-                case 235:
-                case 205:
-                    if (ts.getModifierFlags(node) & 512) {
+                case 193 /* ArrowFunction */:
+                case 234 /* FunctionDeclaration */:
+                case 192 /* FunctionExpression */:
+                case 235 /* ClassDeclaration */:
+                case 205 /* ClassExpression */:
+                    if (ts.getModifierFlags(node) & 512 /* Default */) {
                         return "default";
                     }
+                    // We may get a string with newlines or other whitespace in the case of an object dereference
+                    // (eg: "app\n.onactivated"), so we should remove the whitespace for readabiltiy in the
+                    // navigation bar.
                     return getFunctionOrClassName(node);
-                case 155:
+                case 155 /* Constructor */:
                     return "constructor";
-                case 159:
+                case 159 /* ConstructSignature */:
                     return "new()";
-                case 158:
+                case 158 /* CallSignature */:
                     return "()";
-                case 160:
+                case 160 /* IndexSignature */:
                     return "[]";
                 default:
                     return "<unknown>";
             }
         }
+        /** Flattens the NavNode tree to a list, keeping only the top-level items. */
         function topLevelItems(root) {
             var topLevel = [];
             function recur(item) {
@@ -78270,25 +95282,25 @@ var ts;
             return topLevel;
             function isTopLevel(item) {
                 switch (navigationBarNodeKind(item)) {
-                    case 235:
-                    case 205:
-                    case 238:
-                    case 236:
-                    case 239:
-                    case 274:
-                    case 237:
-                    case 297:
-                    case 292:
+                    case 235 /* ClassDeclaration */:
+                    case 205 /* ClassExpression */:
+                    case 238 /* EnumDeclaration */:
+                    case 236 /* InterfaceDeclaration */:
+                    case 239 /* ModuleDeclaration */:
+                    case 274 /* SourceFile */:
+                    case 237 /* TypeAliasDeclaration */:
+                    case 297 /* JSDocTypedefTag */:
+                    case 292 /* JSDocCallbackTag */:
                         return true;
-                    case 155:
-                    case 154:
-                    case 156:
-                    case 157:
-                    case 232:
+                    case 155 /* Constructor */:
+                    case 154 /* MethodDeclaration */:
+                    case 156 /* GetAccessor */:
+                    case 157 /* SetAccessor */:
+                    case 232 /* VariableDeclaration */:
                         return hasSomeImportantChild(item);
-                    case 193:
-                    case 234:
-                    case 192:
+                    case 193 /* ArrowFunction */:
+                    case 234 /* FunctionDeclaration */:
+                    case 192 /* FunctionExpression */:
                         return isTopLevelFunctionDeclaration(item);
                     default:
                         return false;
@@ -78298,10 +95310,10 @@ var ts;
                         return false;
                     }
                     switch (navigationBarNodeKind(item.parent)) {
-                        case 240:
-                        case 274:
-                        case 154:
-                        case 155:
+                        case 240 /* ModuleBlock */:
+                        case 274 /* SourceFile */:
+                        case 154 /* MethodDeclaration */:
+                        case 155 /* Constructor */:
                             return true;
                         default:
                             return hasSomeImportantChild(item);
@@ -78310,23 +95322,24 @@ var ts;
                 function hasSomeImportantChild(item) {
                     return ts.some(item.children, function (child) {
                         var childKind = navigationBarNodeKind(child);
-                        return childKind !== 232 && childKind !== 182;
+                        return childKind !== 232 /* VariableDeclaration */ && childKind !== 182 /* BindingElement */;
                     });
                 }
             }
         }
         function convertToTree(n) {
             return {
-                text: getItemName(n.node),
+                text: getItemName(n.node, n.name),
                 kind: ts.getNodeKind(n.node),
                 kindModifiers: getModifiers(n.node),
                 spans: getSpans(n),
+                nameSpan: n.name && getNodeSpan(n.name),
                 childItems: ts.map(n.children, convertToTree)
             };
         }
         function convertToTopLevelItem(n) {
             return {
-                text: getItemName(n.node),
+                text: getItemName(n.node, n.name),
                 kind: ts.getNodeKind(n.node),
                 kindModifiers: getModifiers(n.node),
                 spans: getSpans(n),
@@ -78337,7 +95350,7 @@ var ts;
             };
             function convertToChildItem(n) {
                 return {
-                    text: getItemName(n.node),
+                    text: getItemName(n.node, n.name),
                     kind: ts.getNodeKind(n.node),
                     kindModifiers: ts.getNodeModifiers(n.node),
                     spans: getSpans(n),
@@ -78359,28 +95372,34 @@ var ts;
             return spans;
         }
         function getModuleName(moduleDeclaration) {
+            // We want to maintain quotation marks.
             if (ts.isAmbientModule(moduleDeclaration)) {
                 return ts.getTextOfNode(moduleDeclaration.name);
             }
+            // Otherwise, we need to aggregate each identifier to build up the qualified name.
             var result = [];
             result.push(ts.getTextOfIdentifierOrLiteral(moduleDeclaration.name));
-            while (moduleDeclaration.body && moduleDeclaration.body.kind === 239) {
+            while (moduleDeclaration.body && moduleDeclaration.body.kind === 239 /* ModuleDeclaration */) {
                 moduleDeclaration = moduleDeclaration.body;
                 result.push(ts.getTextOfIdentifierOrLiteral(moduleDeclaration.name));
             }
             return result.join(".");
         }
+        /**
+         * For 'module A.B.C', we want to get the node for 'C'.
+         * We store 'A' as associated with a NavNode, and use getModuleName to traverse down again.
+         */
         function getInteriorModule(decl) {
-            return decl.body.kind === 239 ? getInteriorModule(decl.body) : decl;
+            return decl.body.kind === 239 /* ModuleDeclaration */ ? getInteriorModule(decl.body) : decl; // TODO: GH#18217
         }
         function isComputedProperty(member) {
-            return !member.name || member.name.kind === 147;
+            return !member.name || member.name.kind === 147 /* ComputedPropertyName */;
         }
         function getNodeSpan(node) {
-            return node.kind === 274 ? ts.createTextSpanFromRange(node) : ts.createTextSpanFromNode(node, curSourceFile);
+            return node.kind === 274 /* SourceFile */ ? ts.createTextSpanFromRange(node) : ts.createTextSpanFromNode(node, curSourceFile);
         }
         function getModifiers(node) {
-            if (node.parent && node.parent.kind === 232) {
+            if (node.parent && node.parent.kind === 232 /* VariableDeclaration */) {
                 node = node.parent;
             }
             return ts.getNodeModifiers(node);
@@ -78389,17 +95408,21 @@ var ts;
             if (node.name && ts.getFullWidth(node.name) > 0) {
                 return ts.declarationNameToString(node.name);
             }
-            else if (node.parent.kind === 232) {
+            // See if it is a var initializer. If so, use the var name.
+            else if (node.parent.kind === 232 /* VariableDeclaration */) {
                 return ts.declarationNameToString(node.parent.name);
             }
-            else if (node.parent.kind === 200 &&
-                node.parent.operatorToken.kind === 58) {
+            // See if it is of the form "<expr> = function(){...}". If so, use the text from the left-hand side.
+            else if (node.parent.kind === 200 /* BinaryExpression */ &&
+                node.parent.operatorToken.kind === 58 /* EqualsToken */) {
                 return nodeText(node.parent.left).replace(whiteSpaceRegex, "");
             }
-            else if (node.parent.kind === 270 && node.parent.name) {
+            // See if it is a property assignment, and if so use the property name
+            else if (node.parent.kind === 270 /* PropertyAssignment */ && node.parent.name) {
                 return nodeText(node.parent.name);
             }
-            else if (ts.getModifierFlags(node) & 512) {
+            // Default exports are named "default"
+            else if (ts.getModifierFlags(node) & 512 /* Default */) {
                 return "default";
             }
             else {
@@ -78408,9 +95431,9 @@ var ts;
         }
         function isFunctionOrClassExpression(node) {
             switch (node.kind) {
-                case 193:
-                case 192:
-                case 205:
+                case 193 /* ArrowFunction */:
+                case 192 /* FunctionExpression */:
+                case 205 /* ClassExpression */:
                     return true;
                 default:
                     return false;
@@ -78418,20 +95441,29 @@ var ts;
         }
     })(NavigationBar = ts.NavigationBar || (ts.NavigationBar = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var OrganizeImports;
     (function (OrganizeImports) {
+        /**
+         * Organize imports by:
+         *   1) Removing unused imports
+         *   2) Coalescing imports from the same module
+         *   3) Sorting imports
+         */
         function organizeImports(sourceFile, formatContext, host, program, _preferences) {
             var changeTracker = ts.textChanges.ChangeTracker.fromContext({ host: host, formatContext: formatContext });
             var coalesceAndOrganizeImports = function (importGroup) { return coalesceImports(removeUnusedImports(importGroup, sourceFile, program)); };
+            // All of the old ImportDeclarations in the file, in syntactic order.
             var topLevelImportDecls = sourceFile.statements.filter(ts.isImportDeclaration);
             organizeImportsWorker(topLevelImportDecls, coalesceAndOrganizeImports);
+            // All of the old ExportDeclarations in the file, in syntactic order.
             var topLevelExportDecls = sourceFile.statements.filter(ts.isExportDeclaration);
             organizeImportsWorker(topLevelExportDecls, coalesceExports);
             for (var _i = 0, _a = sourceFile.statements.filter(ts.isAmbientModule); _i < _a.length; _i++) {
                 var ambientModule = _a[_i];
-                var ambientModuleBody = getModuleBlock(ambientModule);
+                var ambientModuleBody = getModuleBlock(ambientModule); // TODO: GH#18217
                 var ambientModuleImportDecls = ambientModuleBody.statements.filter(ts.isImportDeclaration);
                 organizeImportsWorker(ambientModuleImportDecls, coalesceAndOrganizeImports);
                 var ambientModuleExportDecls = ambientModuleBody.statements.filter(ts.isExportDeclaration);
@@ -78442,6 +95474,11 @@ var ts;
                 if (ts.length(oldImportDecls) === 0) {
                     return;
                 }
+                // Special case: normally, we'd expect leading and trailing trivia to follow each import
+                // around as it's sorted.  However, we do not want this to happen for leading trivia
+                // on the first import because it is probably the header comment for the file.
+                // Consider: we could do a more careful check that this trivia is actually a header,
+                // but the consequences of being wrong are very minor.
                 ts.suppressLeadingTrivia(oldImportDecls[0]);
                 var oldImportGroups = ts.group(oldImportDecls, function (importDecl) { return getExternalModuleName(importDecl.moduleSpecifier); });
                 var sortedImportGroups = ts.stableSort(oldImportGroups, function (group1, group2) { return compareModuleSpecifiers(group1[0].moduleSpecifier, group2[0].moduleSpecifier); });
@@ -78450,6 +95487,7 @@ var ts;
                         ? coalesce(importGroup)
                         : importGroup;
                 });
+                // Delete or replace the first import.
                 if (newImportDecls.length === 0) {
                     changeTracker.deleteNode(sourceFile, oldImportDecls[0], {
                         useNonAdjustedStartPosition: true,
@@ -78457,12 +95495,14 @@ var ts;
                     });
                 }
                 else {
+                    // Note: Delete the surrounding trivia because it will have been retained in newImportDecls.
                     changeTracker.replaceNodeWithNodes(sourceFile, oldImportDecls[0], newImportDecls, {
                         useNonAdjustedStartPosition: true,
                         useNonAdjustedEndPosition: false,
                         suffix: ts.getNewLineOrDefaultFromHost(host, formatContext.options),
                     });
                 }
+                // Delete any subsequent imports.
                 for (var i = 1; i < oldImportDecls.length; i++) {
                     changeTracker.deleteNode(sourceFile, oldImportDecls[i]);
                 }
@@ -78476,26 +95516,30 @@ var ts;
         function removeUnusedImports(oldImports, sourceFile, program) {
             var typeChecker = program.getTypeChecker();
             var jsxNamespace = typeChecker.getJsxNamespace();
-            var jsxElementsPresent = !!(sourceFile.transformFlags & 4);
+            var jsxElementsPresent = !!(sourceFile.transformFlags & 4 /* ContainsJsx */);
             var usedImports = [];
             for (var _i = 0, oldImports_1 = oldImports; _i < oldImports_1.length; _i++) {
                 var importDecl = oldImports_1[_i];
                 var importClause = importDecl.importClause;
                 if (!importClause) {
+                    // Imports without import clauses are assumed to be included for their side effects and are not removed.
                     usedImports.push(importDecl);
                     continue;
                 }
                 var name = importClause.name, namedBindings = importClause.namedBindings;
+                // Default import
                 if (name && !isDeclarationUsed(name)) {
                     name = undefined;
                 }
                 if (namedBindings) {
                     if (ts.isNamespaceImport(namedBindings)) {
+                        // Namespace import
                         if (!isDeclarationUsed(namedBindings.name)) {
                             namedBindings = undefined;
                         }
                     }
                     else {
+                        // List of named imports
                         var newElements = namedBindings.elements.filter(function (e) { return isDeclarationUsed(e.name); });
                         if (newElements.length < namedBindings.elements.length) {
                             namedBindings = newElements.length
@@ -78510,6 +95554,7 @@ var ts;
             }
             return usedImports;
             function isDeclarationUsed(identifier) {
+                // The JSX factory symbol is always used if JSX elements are present - even if they are not allowed.
                 return jsxElementsPresent && (identifier.text === jsxNamespace) || ts.FindAllReferences.Core.isSymbolReferencedInFile(identifier, typeChecker, sourceFile);
             }
         }
@@ -78518,6 +95563,10 @@ var ts;
                 ? specifier.text
                 : undefined;
         }
+        /* @internal */ // Internal for testing
+        /**
+         * @param importGroup a list of ImportDeclarations, all with the same module name.
+         */
         function coalesceImports(importGroup) {
             if (importGroup.length === 0) {
                 return importGroup;
@@ -78527,17 +95576,21 @@ var ts;
             if (importWithoutClause) {
                 coalescedImports.push(importWithoutClause);
             }
+            // Normally, we don't combine default and namespace imports, but it would be silly to
+            // produce two import declarations in this special case.
             if (defaultImports.length === 1 && namespaceImports.length === 1 && namedImports.length === 0) {
+                // Add the namespace import to the existing default ImportDeclaration.
                 var defaultImport = defaultImports[0];
-                coalescedImports.push(updateImportDeclarationAndClause(defaultImport, defaultImport.importClause.name, namespaceImports[0].importClause.namedBindings));
+                coalescedImports.push(updateImportDeclarationAndClause(defaultImport, defaultImport.importClause.name, namespaceImports[0].importClause.namedBindings)); // TODO: GH#18217
                 return coalescedImports;
             }
             var sortedNamespaceImports = ts.stableSort(namespaceImports, function (i1, i2) {
                 return compareIdentifiers(i1.importClause.namedBindings.name, i2.importClause.namedBindings.name);
-            });
+            }); // TODO: GH#18217
             for (var _i = 0, sortedNamespaceImports_1 = sortedNamespaceImports; _i < sortedNamespaceImports_1.length; _i++) {
                 var namespaceImport = sortedNamespaceImports_1[_i];
-                coalescedImports.push(updateImportDeclarationAndClause(namespaceImport, undefined, namespaceImport.importClause.namedBindings));
+                // Drop the name, if any
+                coalescedImports.push(updateImportDeclarationAndClause(namespaceImport, /*name*/ undefined, namespaceImport.importClause.namedBindings)); // TODO: GH#18217
             }
             if (defaultImports.length === 0 && namedImports.length === 0) {
                 return coalescedImports;
@@ -78550,10 +95603,10 @@ var ts;
             else {
                 for (var _b = 0, defaultImports_1 = defaultImports; _b < defaultImports_1.length; _b++) {
                     var defaultImport = defaultImports_1[_b];
-                    newImportSpecifiers.push(ts.createImportSpecifier(ts.createIdentifier("default"), defaultImport.importClause.name));
+                    newImportSpecifiers.push(ts.createImportSpecifier(ts.createIdentifier("default"), defaultImport.importClause.name)); // TODO: GH#18217
                 }
             }
-            newImportSpecifiers.push.apply(newImportSpecifiers, ts.flatMap(namedImports, function (i) { return i.importClause.namedBindings.elements; }));
+            newImportSpecifiers.push.apply(newImportSpecifiers, ts.flatMap(namedImports, function (i) { return i.importClause.namedBindings.elements; })); // TODO: GH#18217
             var sortedImportSpecifiers = sortSpecifiers(newImportSpecifiers);
             var importDecl = defaultImports.length > 0
                 ? defaultImports[0]
@@ -78564,9 +95617,16 @@ var ts;
                     : ts.createNamedImports(ts.emptyArray)
                 : namedImports.length === 0
                     ? ts.createNamedImports(sortedImportSpecifiers)
-                    : ts.updateNamedImports(namedImports[0].importClause.namedBindings, sortedImportSpecifiers);
+                    : ts.updateNamedImports(namedImports[0].importClause.namedBindings, sortedImportSpecifiers); // TODO: GH#18217
             coalescedImports.push(updateImportDeclarationAndClause(importDecl, newDefaultImport, newNamedImports));
             return coalescedImports;
+            /*
+             * Returns entire import declarations because they may already have been rewritten and
+             * may lack parent pointers.  The desired parts can easily be recovered based on the
+             * categorization.
+             *
+             * NB: There may be overlap between `defaultImports` and `namespaceImports`/`namedImports`.
+             */
             function getCategorizedImports(importGroup) {
                 var importWithoutClause;
                 var defaultImports = [];
@@ -78575,6 +95635,8 @@ var ts;
                 for (var _i = 0, importGroup_1 = importGroup; _i < importGroup_1.length; _i++) {
                     var importDeclaration = importGroup_1[_i];
                     if (importDeclaration.importClause === undefined) {
+                        // Only the first such import is interesting - the others are redundant.
+                        // Note: Unfortunately, we will lose trivia that was on this node.
                         importWithoutClause = importWithoutClause || importDeclaration;
                         continue;
                     }
@@ -78600,6 +95662,10 @@ var ts;
             }
         }
         OrganizeImports.coalesceImports = coalesceImports;
+        /* @internal */ // Internal for testing
+        /**
+         * @param exportGroup a list of ExportDeclarations, all with the same module name.
+         */
         function coalesceExports(exportGroup) {
             if (exportGroup.length === 0) {
                 return exportGroup;
@@ -78618,12 +95684,19 @@ var ts;
             var exportDecl = namedExports[0];
             coalescedExports.push(ts.updateExportDeclaration(exportDecl, exportDecl.decorators, exportDecl.modifiers, ts.updateNamedExports(exportDecl.exportClause, sortedExportSpecifiers), exportDecl.moduleSpecifier));
             return coalescedExports;
+            /*
+             * Returns entire export declarations because they may already have been rewritten and
+             * may lack parent pointers.  The desired parts can easily be recovered based on the
+             * categorization.
+             */
             function getCategorizedExports(exportGroup) {
                 var exportWithoutClause;
                 var namedExports = [];
                 for (var _i = 0, exportGroup_1 = exportGroup; _i < exportGroup_1.length; _i++) {
                     var exportDeclaration = exportGroup_1[_i];
                     if (exportDeclaration.exportClause === undefined) {
+                        // Only the first such export is interesting - the others are redundant.
+                        // Note: Unfortunately, we will lose trivia that was on this node.
                         exportWithoutClause = exportWithoutClause || exportDeclaration;
                     }
                     else {
@@ -78638,7 +95711,8 @@ var ts;
         }
         OrganizeImports.coalesceExports = coalesceExports;
         function updateImportDeclarationAndClause(importDeclaration, name, namedBindings) {
-            return ts.updateImportDeclaration(importDeclaration, importDeclaration.decorators, importDeclaration.modifiers, ts.updateImportClause(importDeclaration.importClause, name, namedBindings), importDeclaration.moduleSpecifier);
+            return ts.updateImportDeclaration(importDeclaration, importDeclaration.decorators, importDeclaration.modifiers, ts.updateImportClause(importDeclaration.importClause, name, namedBindings), // TODO: GH#18217
+            importDeclaration.moduleSpecifier);
         }
         function sortSpecifiers(specifiers) {
             return ts.stableSort(specifiers, function (s1, s2) {
@@ -78646,6 +95720,7 @@ var ts;
                     compareIdentifiers(s1.name, s2.name);
             });
         }
+        /* internal */ // Exported for testing
         function compareModuleSpecifiers(m1, m2) {
             var name1 = getExternalModuleName(m1);
             var name2 = getExternalModuleName(m2);
@@ -78659,6 +95734,7 @@ var ts;
         }
     })(OrganizeImports = ts.OrganizeImports || (ts.OrganizeImports = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var OutliningElementsCollector;
@@ -78689,7 +95765,7 @@ var ts;
                 }
                 var lastImport = current - 1;
                 if (lastImport !== firstImport) {
-                    out.push(createOutliningSpanFromBounds(ts.findChildOfKind(statements[firstImport], 91, sourceFile).getStart(sourceFile), statements[lastImport].getEnd(), "imports"));
+                    out.push(createOutliningSpanFromBounds(ts.findChildOfKind(statements[firstImport], 91 /* ImportKeyword */, sourceFile).getStart(sourceFile), statements[lastImport].getEnd(), "imports" /* Imports */));
                 }
             }
             function visitNonImportNode(n) {
@@ -78704,6 +95780,7 @@ var ts;
                     out.push(span);
                 depthRemaining--;
                 if (ts.isIfStatement(n) && n.elseStatement && ts.isIfStatement(n.elseStatement)) {
+                    // Consider an 'else if' to be on the same depth as the 'if'.
                     visitNonImportNode(n.expression);
                     visitNonImportNode(n.thenStatement);
                     depthRemaining++;
@@ -78729,7 +95806,7 @@ var ts;
                 }
                 if (!result[1]) {
                     var span = ts.createTextSpanFromBounds(sourceFile.text.indexOf("//", currentLineStart), lineEnd);
-                    regions.push(createOutliningSpan(span, "region", span, false, result[2] || "#region"));
+                    regions.push(createOutliningSpan(span, "region" /* Region */, span, /*autoCollapse*/ false, result[2] || "#region"));
                 }
                 else {
                     var region = regions.pop();
@@ -78748,20 +95825,22 @@ var ts;
             var firstSingleLineCommentStart = -1;
             var lastSingleLineCommentEnd = -1;
             var singleLineCommentCount = 0;
-            for (var _i = 0, comments_3 = comments; _i < comments_3.length; _i++) {
-                var _a = comments_3[_i], kind = _a.kind, pos = _a.pos, end = _a.end;
+            for (var _i = 0, comments_1 = comments; _i < comments_1.length; _i++) {
+                var _a = comments_1[_i], kind = _a.kind, pos = _a.pos, end = _a.end;
                 cancellationToken.throwIfCancellationRequested();
                 switch (kind) {
-                    case 2:
+                    case 2 /* SingleLineCommentTrivia */:
+                        // For single line comments, combine consecutive ones (2 or more) into
+                        // a single span from the start of the first till the end of the last
                         if (singleLineCommentCount === 0) {
                             firstSingleLineCommentStart = pos;
                         }
                         lastSingleLineCommentEnd = end;
                         singleLineCommentCount++;
                         break;
-                    case 3:
+                    case 3 /* MultiLineCommentTrivia */:
                         combineAndAddMultipleSingleLineComments();
-                        out.push(createOutliningSpanFromBounds(pos, end, "comment"));
+                        out.push(createOutliningSpanFromBounds(pos, end, "comment" /* Comment */));
                         singleLineCommentCount = 0;
                         break;
                     default:
@@ -78770,8 +95849,9 @@ var ts;
             }
             combineAndAddMultipleSingleLineComments();
             function combineAndAddMultipleSingleLineComments() {
+                // Only outline spans of two or more consecutive single line comments
                 if (singleLineCommentCount > 1) {
-                    out.push(createOutliningSpanFromBounds(firstSingleLineCommentStart, lastSingleLineCommentEnd, "comment"));
+                    out.push(createOutliningSpanFromBounds(firstSingleLineCommentStart, lastSingleLineCommentEnd, "comment" /* Comment */));
                 }
             }
         }
@@ -78780,59 +95860,69 @@ var ts;
         }
         function getOutliningSpanForNode(n, sourceFile) {
             switch (n.kind) {
-                case 213:
+                case 213 /* Block */:
                     if (ts.isFunctionBlock(n)) {
-                        return spanForNode(n.parent, n.parent.kind !== 193);
+                        return spanForNode(n.parent, /*autoCollapse*/ n.parent.kind !== 193 /* ArrowFunction */);
                     }
+                    // Check if the block is standalone, or 'attached' to some parent statement.
+                    // If the latter, we want to collapse the block, but consider its hint span
+                    // to be the entire span of the parent.
                     switch (n.parent.kind) {
-                        case 218:
-                        case 221:
-                        case 222:
-                        case 220:
-                        case 217:
-                        case 219:
-                        case 226:
-                        case 269:
+                        case 218 /* DoStatement */:
+                        case 221 /* ForInStatement */:
+                        case 222 /* ForOfStatement */:
+                        case 220 /* ForStatement */:
+                        case 217 /* IfStatement */:
+                        case 219 /* WhileStatement */:
+                        case 226 /* WithStatement */:
+                        case 269 /* CatchClause */:
                             return spanForNode(n.parent);
-                        case 230:
+                        case 230 /* TryStatement */:
+                            // Could be the try-block, or the finally-block.
                             var tryStatement = n.parent;
                             if (tryStatement.tryBlock === n) {
                                 return spanForNode(n.parent);
                             }
                             else if (tryStatement.finallyBlock === n) {
-                                return spanForNode(ts.findChildOfKind(tryStatement, 87, sourceFile));
+                                return spanForNode(ts.findChildOfKind(tryStatement, 87 /* FinallyKeyword */, sourceFile));
                             }
+                        // falls through
                         default:
-                            return createOutliningSpan(ts.createTextSpanFromNode(n, sourceFile), "code");
+                            // Block was a standalone block.  In this case we want to only collapse
+                            // the span of the block, independent of any parent span.
+                            return createOutliningSpan(ts.createTextSpanFromNode(n, sourceFile), "code" /* Code */);
                     }
-                case 240:
+                case 240 /* ModuleBlock */:
                     return spanForNode(n.parent);
-                case 235:
-                case 236:
-                case 238:
-                case 241:
+                case 235 /* ClassDeclaration */:
+                case 236 /* InterfaceDeclaration */:
+                case 238 /* EnumDeclaration */:
+                case 241 /* CaseBlock */:
                     return spanForNode(n);
-                case 184:
+                case 184 /* ObjectLiteralExpression */:
                     return spanForObjectOrArrayLiteral(n);
-                case 183:
-                    return spanForObjectOrArrayLiteral(n, 21);
+                case 183 /* ArrayLiteralExpression */:
+                    return spanForObjectOrArrayLiteral(n, 21 /* OpenBracketToken */);
             }
             function spanForObjectOrArrayLiteral(node, open) {
-                if (open === void 0) { open = 17; }
-                return spanForNode(node, false, !ts.isArrayLiteralExpression(node.parent), open);
+                if (open === void 0) { open = 17 /* OpenBraceToken */; }
+                // If the block has no leading keywords and is inside an array literal,
+                // we only want to collapse the span of the block.
+                // Otherwise, the collapsed section will include the end of the previous line.
+                return spanForNode(node, /*autoCollapse*/ false, /*useFullStart*/ !ts.isArrayLiteralExpression(node.parent), open);
             }
             function spanForNode(hintSpanNode, autoCollapse, useFullStart, open) {
                 if (autoCollapse === void 0) { autoCollapse = false; }
                 if (useFullStart === void 0) { useFullStart = true; }
-                if (open === void 0) { open = 17; }
+                if (open === void 0) { open = 17 /* OpenBraceToken */; }
                 var openToken = ts.findChildOfKind(n, open, sourceFile);
-                var close = open === 17 ? 18 : 22;
+                var close = open === 17 /* OpenBraceToken */ ? 18 /* CloseBraceToken */ : 22 /* CloseBracketToken */;
                 var closeToken = ts.findChildOfKind(n, close, sourceFile);
                 if (!openToken || !closeToken) {
                     return undefined;
                 }
                 var textSpan = ts.createTextSpanFromBounds(useFullStart ? openToken.getFullStart() : openToken.getStart(sourceFile), closeToken.getEnd());
-                return createOutliningSpan(textSpan, "code", ts.createTextSpanFromNode(hintSpanNode, sourceFile), autoCollapse);
+                return createOutliningSpan(textSpan, "code" /* Code */, ts.createTextSpanFromNode(hintSpanNode, sourceFile), autoCollapse);
             }
         }
         function createOutliningSpan(textSpan, kind, hintSpan, autoCollapse, bannerText) {
@@ -78843,8 +95933,10 @@ var ts;
         }
     })(OutliningElementsCollector = ts.OutliningElementsCollector || (ts.OutliningElementsCollector = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
+    // Note(cyrusn): this enum is ordered from strongest match type to weakest match type.
     var PatternMatchKind;
     (function (PatternMatchKind) {
         PatternMatchKind[PatternMatchKind["exact"] = 0] = "exact";
@@ -78859,8 +95951,13 @@ var ts;
         };
     }
     function createPatternMatcher(pattern) {
+        // We'll often see the same candidate string many times when searching (For example, when
+        // we see the name of a module that is used everywhere, or the name of an overload).  As
+        // such, we cache the information we compute about the candidate for the life of this
+        // pattern matcher so we don't have to compute it multiple times.
         var stringToWordSpans = ts.createMap();
         var dotSeparatedSegments = pattern.trim().split(".").map(function (p) { return createSegment(p.trim()); });
+        // A segment is considered invalid if we couldn't find any words in it.
         if (dotSeparatedSegments.some(function (segment) { return !segment.subWordTextChunks.length; }))
             return undefined;
         return {
@@ -78871,12 +95968,19 @@ var ts;
     }
     ts.createPatternMatcher = createPatternMatcher;
     function getFullMatch(candidateContainers, candidate, dotSeparatedSegments, stringToWordSpans) {
+        // First, check that the last part of the dot separated pattern matches the name of the
+        // candidate.  If not, then there's no point in proceeding and doing the more
+        // expensive work.
         var candidateMatch = matchSegment(candidate, ts.last(dotSeparatedSegments), stringToWordSpans);
         if (!candidateMatch) {
             return undefined;
         }
         candidateContainers = candidateContainers || [];
+        // -1 because the last part was checked against the name, and only the rest
+        // of the parts are checked against the container.
         if (dotSeparatedSegments.length - 1 > candidateContainers.length) {
+            // There weren't enough container parts to match against the pattern parts.
+            // So this definitely doesn't match.
             return undefined;
         }
         var bestMatch;
@@ -78895,30 +95999,49 @@ var ts;
     function matchTextChunk(candidate, chunk, stringToWordSpans) {
         var index = indexOfIgnoringCase(candidate, chunk.textLowerCase);
         if (index === 0) {
-            return createPatternMatch(chunk.text.length === candidate.length ? PatternMatchKind.exact : PatternMatchKind.prefix, ts.startsWith(candidate, chunk.text));
+            // a) Check if the word is a prefix of the candidate, in a case insensitive or
+            //    sensitive manner. If it does, return that there was an exact match if the word and candidate are the same length, else a prefix match.
+            return createPatternMatch(chunk.text.length === candidate.length ? PatternMatchKind.exact : PatternMatchKind.prefix, /*isCaseSensitive:*/ ts.startsWith(candidate, chunk.text));
         }
         if (chunk.isLowerCase) {
             if (index === -1)
                 return undefined;
+            // b) If the part is entirely lowercase, then check if it is contained anywhere in the
+            //    candidate in a case insensitive manner.  If so, return that there was a substring
+            //    match.
+            //
+            //    Note: We only have a substring match if the lowercase part is prefix match of some
+            //    word part. That way we don't match something like 'Class' when the user types 'a'.
+            //    But we would match 'FooAttribute' (since 'Attribute' starts with 'a').
             var wordSpans = getWordSpans(candidate, stringToWordSpans);
             for (var _i = 0, wordSpans_1 = wordSpans; _i < wordSpans_1.length; _i++) {
                 var span = wordSpans_1[_i];
-                if (partStartsWith(candidate, span, chunk.text, true)) {
-                    return createPatternMatch(PatternMatchKind.substring, partStartsWith(candidate, span, chunk.text, false));
+                if (partStartsWith(candidate, span, chunk.text, /*ignoreCase:*/ true)) {
+                    return createPatternMatch(PatternMatchKind.substring, /*isCaseSensitive:*/ partStartsWith(candidate, span, chunk.text, /*ignoreCase:*/ false));
                 }
             }
+            // c) Is the pattern a substring of the candidate starting on one of the candidate's word boundaries?
+            // We could check every character boundary start of the candidate for the pattern. However, that's
+            // an m * n operation in the wost case. Instead, find the first instance of the pattern
+            // substring, and see if it starts on a capital letter. It seems unlikely that the user will try to
+            // filter the list based on a substring that starts on a capital letter and also with a lowercase one.
+            // (Pattern: fogbar, Candidate: quuxfogbarFogBar).
             if (chunk.text.length < candidate.length && isUpperCaseLetter(candidate.charCodeAt(index))) {
-                return createPatternMatch(PatternMatchKind.substring, false);
+                return createPatternMatch(PatternMatchKind.substring, /*isCaseSensitive:*/ false);
             }
         }
         else {
+            // d) If the part was not entirely lowercase, then check if it is contained in the
+            //    candidate in a case *sensitive* manner. If so, return that there was a substring
+            //    match.
             if (candidate.indexOf(chunk.text) > 0) {
-                return createPatternMatch(PatternMatchKind.substring, true);
+                return createPatternMatch(PatternMatchKind.substring, /*isCaseSensitive:*/ true);
             }
+            // e) If the part was not entirely lowercase, then attempt a camel cased match as well.
             if (chunk.characterSpans.length > 0) {
                 var candidateParts = getWordSpans(candidate, stringToWordSpans);
-                var isCaseSensitive = tryCamelCaseMatch(candidate, candidateParts, chunk, false) ? true
-                    : tryCamelCaseMatch(candidate, candidateParts, chunk, true) ? false : undefined;
+                var isCaseSensitive = tryCamelCaseMatch(candidate, candidateParts, chunk, /*ignoreCase:*/ false) ? true
+                    : tryCamelCaseMatch(candidate, candidateParts, chunk, /*ignoreCase:*/ true) ? false : undefined;
                 if (isCaseSensitive !== undefined) {
                     return createPatternMatch(PatternMatchKind.camelCase, isCaseSensitive);
                 }
@@ -78926,11 +96049,53 @@ var ts;
         }
     }
     function matchSegment(candidate, segment, stringToWordSpans) {
-        if (every(segment.totalTextChunk.text, function (ch) { return ch !== 32 && ch !== 42; })) {
+        // First check if the segment matches as is.  This is also useful if the segment contains
+        // characters we would normally strip when splitting into parts that we also may want to
+        // match in the candidate.  For example if the segment is "@int" and the candidate is
+        // "@int", then that will show up as an exact match here.
+        //
+        // Note: if the segment contains a space or an asterisk then we must assume that it's a
+        // multi-word segment.
+        if (every(segment.totalTextChunk.text, function (ch) { return ch !== 32 /* space */ && ch !== 42 /* asterisk */; })) {
             var match = matchTextChunk(candidate, segment.totalTextChunk, stringToWordSpans);
             if (match)
                 return match;
         }
+        // The logic for pattern matching is now as follows:
+        //
+        // 1) Break the segment passed in into words.  Breaking is rather simple and a
+        //    good way to think about it that if gives you all the individual alphanumeric words
+        //    of the pattern.
+        //
+        // 2) For each word try to match the word against the candidate value.
+        //
+        // 3) Matching is as follows:
+        //
+        //   a) Check if the word is a prefix of the candidate, in a case insensitive or
+        //      sensitive manner. If it does, return that there was an exact match if the word and candidate are the same length, else a prefix match.
+        //
+        //   If the word is entirely lowercase:
+        //      b) Then check if it is contained anywhere in the
+        //          candidate in a case insensitive manner.  If so, return that there was a substring
+        //          match.
+        //
+        //          Note: We only have a substring match if the lowercase part is prefix match of
+        //          some word part. That way we don't match something like 'Class' when the user
+        //          types 'a'. But we would match 'FooAttribute' (since 'Attribute' starts with
+        //          'a').
+        //
+        //       c) The word is all lower case. Is it a case insensitive substring of the candidate starting
+        //          on a part boundary of the candidate?
+        //
+        //   Else:
+        //       d) If the word was not entirely lowercase, then check if it is contained in the
+        //          candidate in a case *sensitive* manner. If so, return that there was a substring
+        //          match.
+        //
+        //       e) If the word was not entirely lowercase, then attempt a camel cased match as
+        //          well.
+        //
+        // Only if all words have some sort of match is the pattern considered matched.
         var subWordTextChunks = segment.subWordTextChunks;
         var bestMatch;
         for (var _i = 0, subWordTextChunks_1 = subWordTextChunks; _i < subWordTextChunks_1.length; _i++) {
@@ -78943,12 +96108,12 @@ var ts;
         return ts.min(a, b, compareMatches);
     }
     function compareMatches(a, b) {
-        return a === undefined ? 1 : b === undefined ? -1
+        return a === undefined ? 1 /* GreaterThan */ : b === undefined ? -1 /* LessThan */
             : ts.compareValues(a.kind, b.kind) || ts.compareBooleans(!a.isCaseSensitive, !b.isCaseSensitive);
     }
     function partStartsWith(candidate, candidateSpan, pattern, ignoreCase, patternSpan) {
         if (patternSpan === void 0) { patternSpan = { start: 0, length: pattern.length }; }
-        return patternSpan.length <= candidateSpan.length
+        return patternSpan.length <= candidateSpan.length // If pattern part is longer than the candidate part there can never be a match.
             && everyInRange(0, patternSpan.length, function (i) { return equalChars(pattern.charCodeAt(patternSpan.start + i), candidate.charCodeAt(candidateSpan.start + i), ignoreCase); });
     }
     function equalChars(ch1, ch2, ignoreCase) {
@@ -78956,22 +96121,35 @@ var ts;
     }
     function tryCamelCaseMatch(candidate, candidateParts, chunk, ignoreCase) {
         var chunkCharacterSpans = chunk.characterSpans;
+        // Note: we may have more pattern parts than candidate parts.  This is because multiple
+        // pattern parts may match a candidate part.  For example "SiUI" against "SimpleUI".
+        // We'll have 3 pattern parts Si/U/I against two candidate parts Simple/UI.  However, U
+        // and I will both match in UI.
         var currentCandidate = 0;
         var currentChunkSpan = 0;
         var firstMatch;
         var contiguous;
         while (true) {
+            // Let's consider our termination cases
             if (currentChunkSpan === chunkCharacterSpans.length) {
                 return true;
             }
             else if (currentCandidate === candidateParts.length) {
+                // No match, since we still have more of the pattern to hit
                 return false;
             }
             var candidatePart = candidateParts[currentCandidate];
             var gotOneMatchThisCandidate = false;
+            // Consider the case of matching SiUI against SimpleUIElement. The candidate parts
+            // will be Simple/UI/Element, and the pattern parts will be Si/U/I.  We'll match 'Si'
+            // against 'Simple' first.  Then we'll match 'U' against 'UI'. However, we want to
+            // still keep matching pattern parts against that candidate part.
             for (; currentChunkSpan < chunkCharacterSpans.length; currentChunkSpan++) {
                 var chunkCharacterSpan = chunkCharacterSpans[currentChunkSpan];
                 if (gotOneMatchThisCandidate) {
+                    // We've already gotten one pattern part match in this candidate.  We will
+                    // only continue trying to consumer pattern parts if the last part and this
+                    // part are both upper case.
                     if (!isUpperCaseLetter(chunk.text.charCodeAt(chunkCharacterSpans[currentChunkSpan - 1].start)) ||
                         !isUpperCaseLetter(chunk.text.charCodeAt(chunkCharacterSpans[currentChunkSpan].start))) {
                         break;
@@ -78982,12 +96160,20 @@ var ts;
                 }
                 gotOneMatchThisCandidate = true;
                 firstMatch = firstMatch === undefined ? currentCandidate : firstMatch;
+                // If we were contiguous, then keep that value.  If we weren't, then keep that
+                // value.  If we don't know, then set the value to 'true' as an initial match is
+                // obviously contiguous.
                 contiguous = contiguous === undefined ? true : contiguous;
                 candidatePart = ts.createTextSpan(candidatePart.start + chunkCharacterSpan.length, candidatePart.length - chunkCharacterSpan.length);
             }
+            // Check if we matched anything at all.  If we didn't, then we need to unset the
+            // contiguous bit if we currently had it set.
+            // If we haven't set the bit yet, then that means we haven't matched anything so
+            // far, and we don't want to change that.
             if (!gotOneMatchThisCandidate && contiguous !== undefined) {
                 contiguous = false;
             }
+            // Move onto the next candidate.
             currentCandidate++;
         }
     }
@@ -78998,53 +96184,64 @@ var ts;
         };
     }
     function isUpperCaseLetter(ch) {
-        if (ch >= 65 && ch <= 90) {
+        // Fast check for the ascii range.
+        if (ch >= 65 /* A */ && ch <= 90 /* Z */) {
             return true;
         }
-        if (ch < 127 || !ts.isUnicodeIdentifierStart(ch, 6)) {
+        if (ch < 127 /* maxAsciiCharacter */ || !ts.isUnicodeIdentifierStart(ch, 6 /* Latest */)) {
             return false;
         }
+        // TODO: find a way to determine this for any unicode characters in a
+        // non-allocating manner.
         var str = String.fromCharCode(ch);
         return str === str.toUpperCase();
     }
     function isLowerCaseLetter(ch) {
-        if (ch >= 97 && ch <= 122) {
+        // Fast check for the ascii range.
+        if (ch >= 97 /* a */ && ch <= 122 /* z */) {
             return true;
         }
-        if (ch < 127 || !ts.isUnicodeIdentifierStart(ch, 6)) {
+        if (ch < 127 /* maxAsciiCharacter */ || !ts.isUnicodeIdentifierStart(ch, 6 /* Latest */)) {
             return false;
         }
+        // TODO: find a way to determine this for any unicode characters in a
+        // non-allocating manner.
         var str = String.fromCharCode(ch);
         return str === str.toLowerCase();
     }
+    // Assumes 'value' is already lowercase.
     function indexOfIgnoringCase(str, value) {
         var n = str.length - value.length;
-        var _loop_16 = function (start) {
+        var _loop_5 = function (start) {
             if (every(value, function (valueChar, i) { return toLowerCase(str.charCodeAt(i + start)) === valueChar; })) {
                 return { value: start };
             }
         };
         for (var start = 0; start <= n; start++) {
-            var state_4 = _loop_16(start);
-            if (typeof state_4 === "object")
-                return state_4.value;
+            var state_1 = _loop_5(start);
+            if (typeof state_1 === "object")
+                return state_1.value;
         }
         return -1;
     }
     function toLowerCase(ch) {
-        if (ch >= 65 && ch <= 90) {
-            return 97 + (ch - 65);
+        // Fast convert for the ascii range.
+        if (ch >= 65 /* A */ && ch <= 90 /* Z */) {
+            return 97 /* a */ + (ch - 65 /* A */);
         }
-        if (ch < 127) {
+        if (ch < 127 /* maxAsciiCharacter */) {
             return ch;
         }
+        // TODO: find a way to compute this for any unicode characters in a
+        // non-allocating manner.
         return String.fromCharCode(ch).toLowerCase().charCodeAt(0);
     }
     function isDigit(ch) {
-        return ch >= 48 && ch <= 57;
+        // TODO(cyrusn): Find a way to support this for unicode digits.
+        return ch >= 48 /* _0 */ && ch <= 57 /* _9 */;
     }
     function isWordChar(ch) {
-        return isUpperCaseLetter(ch) || isLowerCaseLetter(ch) || isDigit(ch) || ch === 95 || ch === 36;
+        return isUpperCaseLetter(ch) || isLowerCaseLetter(ch) || isDigit(ch) || ch === 95 /* _ */ || ch === 36 /* $ */;
     }
     function breakPatternIntoTextChunks(pattern) {
         var result = [];
@@ -79079,12 +96276,12 @@ var ts;
             characterSpans: breakIntoCharacterSpans(text)
         };
     }
-    function breakIntoCharacterSpans(identifier) {
-        return breakIntoSpans(identifier, false);
+    /* @internal */ function breakIntoCharacterSpans(identifier) {
+        return breakIntoSpans(identifier, /*word:*/ false);
     }
     ts.breakIntoCharacterSpans = breakIntoCharacterSpans;
-    function breakIntoWordSpans(identifier) {
-        return breakIntoSpans(identifier, true);
+    /* @internal */ function breakIntoWordSpans(identifier) {
+        return breakIntoSpans(identifier, /*word:*/ true);
     }
     ts.breakIntoWordSpans = breakIntoWordSpans;
     function breakIntoSpans(identifier, word) {
@@ -79113,37 +96310,51 @@ var ts;
     }
     function charIsPunctuation(ch) {
         switch (ch) {
-            case 33:
-            case 34:
-            case 35:
-            case 37:
-            case 38:
-            case 39:
-            case 40:
-            case 41:
-            case 42:
-            case 44:
-            case 45:
-            case 46:
-            case 47:
-            case 58:
-            case 59:
-            case 63:
-            case 64:
-            case 91:
-            case 92:
-            case 93:
-            case 95:
-            case 123:
-            case 125:
+            case 33 /* exclamation */:
+            case 34 /* doubleQuote */:
+            case 35 /* hash */:
+            case 37 /* percent */:
+            case 38 /* ampersand */:
+            case 39 /* singleQuote */:
+            case 40 /* openParen */:
+            case 41 /* closeParen */:
+            case 42 /* asterisk */:
+            case 44 /* comma */:
+            case 45 /* minus */:
+            case 46 /* dot */:
+            case 47 /* slash */:
+            case 58 /* colon */:
+            case 59 /* semicolon */:
+            case 63 /* question */:
+            case 64 /* at */:
+            case 91 /* openBracket */:
+            case 92 /* backslash */:
+            case 93 /* closeBracket */:
+            case 95 /* _ */:
+            case 123 /* openBrace */:
+            case 125 /* closeBrace */:
                 return true;
         }
         return false;
     }
     function isAllPunctuation(identifier, start, end) {
-        return every(identifier, function (ch) { return charIsPunctuation(ch) && ch !== 95; }, start, end);
+        return every(identifier, function (ch) { return charIsPunctuation(ch) && ch !== 95 /* _ */; }, start, end);
     }
     function transitionFromUpperToLower(identifier, index, wordStart) {
+        // Cases this supports:
+        // 1) IDisposable -> I, Disposable
+        // 2) UIElement -> UI, Element
+        // 3) HTMLDocument -> HTML, Document
+        //
+        // etc.
+        // We have a transition from an upper to a lower letter here.  But we only
+        // want to break if all the letters that preceded are uppercase.  i.e. if we
+        // have "Foo" we don't want to break that into "F, oo".  But if we have
+        // "IFoo" or "UIFoo", then we want to break that into "I, Foo" and "UI,
+        // Foo".  i.e. the last uppercase letter belongs to the lowercase letters
+        // that follows.  Note: this will make the following not split properly:
+        // "HELLOthere".  However, these sorts of names do not show up in .Net
+        // programs.
         return index !== wordStart
             && index + 1 < identifier.length
             && isUpperCaseLetter(identifier.charCodeAt(index))
@@ -79153,6 +96364,19 @@ var ts;
     function transitionFromLowerToUpper(identifier, word, index) {
         var lastIsUpper = isUpperCaseLetter(identifier.charCodeAt(index - 1));
         var currentIsUpper = isUpperCaseLetter(identifier.charCodeAt(index));
+        // See if the casing indicates we're starting a new word. Note: if we're breaking on
+        // words, then just seeing an upper case character isn't enough.  Instead, it has to
+        // be uppercase and the previous character can't be uppercase.
+        //
+        // For example, breaking "AddMetadata" on words would make: Add Metadata
+        //
+        // on characters would be: A dd M etadata
+        //
+        // Break "AM" on words would be: AM
+        //
+        // on characters would be: A M
+        //
+        // We break the search string on characters.  But we break the symbol name on words.
         return currentIsUpper && (!word || !lastIsUpper);
     }
     function everyInRange(start, end, pred) {
@@ -79175,11 +96399,12 @@ var ts;
         if (readImportFiles === void 0) { readImportFiles = true; }
         if (detectJavaScriptImports === void 0) { detectJavaScriptImports = false; }
         var pragmaContext = {
-            languageVersion: 1,
+            languageVersion: 1 /* ES5 */,
             pragmas: undefined,
             checkJsDirective: undefined,
             referencedFiles: [],
             typeReferenceDirectives: [],
+            libReferenceDirectives: [],
             amdDependencies: [],
             hasNoDefaultLib: undefined,
             moduleName: undefined
@@ -79189,14 +96414,16 @@ var ts;
         var lastToken;
         var currentToken;
         var braceNesting = 0;
+        // assume that text represent an external module if it contains at least one top level import/export
+        // ambient modules that are found inside external modules are interpreted as module augmentations
         var externalModule = false;
         function nextToken() {
             lastToken = currentToken;
             currentToken = ts.scanner.scan();
-            if (currentToken === 17) {
+            if (currentToken === 17 /* OpenBraceToken */) {
                 braceNesting++;
             }
-            else if (currentToken === 18) {
+            else if (currentToken === 18 /* CloseBraceToken */) {
                 braceNesting--;
             }
             return currentToken;
@@ -79221,13 +96448,17 @@ var ts;
                 externalModule = true;
             }
         }
+        /**
+         * Returns true if at least one token was consumed from the stream
+         */
         function tryConsumeDeclare() {
             var token = ts.scanner.getToken();
-            if (token === 124) {
+            if (token === 124 /* DeclareKeyword */) {
+                // declare module "mod"
                 token = nextToken();
-                if (token === 129) {
+                if (token === 129 /* ModuleKeyword */) {
                     token = nextToken();
-                    if (token === 9) {
+                    if (token === 9 /* StringLiteral */) {
                         recordAmbientExternalModule();
                     }
                 }
@@ -79235,70 +96466,84 @@ var ts;
             }
             return false;
         }
+        /**
+         * Returns true if at least one token was consumed from the stream
+         */
         function tryConsumeImport() {
-            if (lastToken === 23) {
+            if (lastToken === 23 /* DotToken */) {
                 return false;
             }
             var token = ts.scanner.getToken();
-            if (token === 91) {
+            if (token === 91 /* ImportKeyword */) {
                 token = nextToken();
-                if (token === 19) {
+                if (token === 19 /* OpenParenToken */) {
                     token = nextToken();
-                    if (token === 9) {
+                    if (token === 9 /* StringLiteral */) {
+                        // import("mod");
                         recordModuleName();
                         return true;
                     }
                 }
-                else if (token === 9) {
+                else if (token === 9 /* StringLiteral */) {
+                    // import "mod";
                     recordModuleName();
                     return true;
                 }
                 else {
-                    if (token === 71 || ts.isKeyword(token)) {
+                    if (token === 71 /* Identifier */ || ts.isKeyword(token)) {
                         token = nextToken();
-                        if (token === 143) {
+                        if (token === 143 /* FromKeyword */) {
                             token = nextToken();
-                            if (token === 9) {
+                            if (token === 9 /* StringLiteral */) {
+                                // import d from "mod";
                                 recordModuleName();
                                 return true;
                             }
                         }
-                        else if (token === 58) {
-                            if (tryConsumeRequireCall(true)) {
+                        else if (token === 58 /* EqualsToken */) {
+                            if (tryConsumeRequireCall(/*skipCurrentToken*/ true)) {
                                 return true;
                             }
                         }
-                        else if (token === 26) {
+                        else if (token === 26 /* CommaToken */) {
+                            // consume comma and keep going
                             token = nextToken();
                         }
                         else {
+                            // unknown syntax
                             return true;
                         }
                     }
-                    if (token === 17) {
+                    if (token === 17 /* OpenBraceToken */) {
                         token = nextToken();
-                        while (token !== 18 && token !== 1) {
+                        // consume "{ a as B, c, d as D}" clauses
+                        // make sure that it stops on EOF
+                        while (token !== 18 /* CloseBraceToken */ && token !== 1 /* EndOfFileToken */) {
                             token = nextToken();
                         }
-                        if (token === 18) {
+                        if (token === 18 /* CloseBraceToken */) {
                             token = nextToken();
-                            if (token === 143) {
+                            if (token === 143 /* FromKeyword */) {
                                 token = nextToken();
-                                if (token === 9) {
+                                if (token === 9 /* StringLiteral */) {
+                                    // import {a as A} from "mod";
+                                    // import d, {a, b as B} from "mod"
                                     recordModuleName();
                                 }
                             }
                         }
                     }
-                    else if (token === 39) {
+                    else if (token === 39 /* AsteriskToken */) {
                         token = nextToken();
-                        if (token === 118) {
+                        if (token === 118 /* AsKeyword */) {
                             token = nextToken();
-                            if (token === 71 || ts.isKeyword(token)) {
+                            if (token === 71 /* Identifier */ || ts.isKeyword(token)) {
                                 token = nextToken();
-                                if (token === 143) {
+                                if (token === 143 /* FromKeyword */) {
                                     token = nextToken();
-                                    if (token === 9) {
+                                    if (token === 9 /* StringLiteral */) {
+                                        // import * as NS from "mod"
+                                        // import d, * as NS from "mod"
                                         recordModuleName();
                                     }
                                 }
@@ -79312,39 +96557,44 @@ var ts;
         }
         function tryConsumeExport() {
             var token = ts.scanner.getToken();
-            if (token === 84) {
+            if (token === 84 /* ExportKeyword */) {
                 markAsExternalModuleIfTopLevel();
                 token = nextToken();
-                if (token === 17) {
+                if (token === 17 /* OpenBraceToken */) {
                     token = nextToken();
-                    while (token !== 18 && token !== 1) {
+                    // consume "{ a as B, c, d as D}" clauses
+                    // make sure it stops on EOF
+                    while (token !== 18 /* CloseBraceToken */ && token !== 1 /* EndOfFileToken */) {
                         token = nextToken();
                     }
-                    if (token === 18) {
+                    if (token === 18 /* CloseBraceToken */) {
                         token = nextToken();
-                        if (token === 143) {
+                        if (token === 143 /* FromKeyword */) {
                             token = nextToken();
-                            if (token === 9) {
+                            if (token === 9 /* StringLiteral */) {
+                                // export {a as A} from "mod";
+                                // export {a, b as B} from "mod"
                                 recordModuleName();
                             }
                         }
                     }
                 }
-                else if (token === 39) {
+                else if (token === 39 /* AsteriskToken */) {
                     token = nextToken();
-                    if (token === 143) {
+                    if (token === 143 /* FromKeyword */) {
                         token = nextToken();
-                        if (token === 9) {
+                        if (token === 9 /* StringLiteral */) {
+                            // export * from "mod"
                             recordModuleName();
                         }
                     }
                 }
-                else if (token === 91) {
+                else if (token === 91 /* ImportKeyword */) {
                     token = nextToken();
-                    if (token === 71 || ts.isKeyword(token)) {
+                    if (token === 71 /* Identifier */ || ts.isKeyword(token)) {
                         token = nextToken();
-                        if (token === 58) {
-                            if (tryConsumeRequireCall(true)) {
+                        if (token === 58 /* EqualsToken */) {
+                            if (tryConsumeRequireCall(/*skipCurrentToken*/ true)) {
                                 return true;
                             }
                         }
@@ -79356,11 +96606,12 @@ var ts;
         }
         function tryConsumeRequireCall(skipCurrentToken) {
             var token = skipCurrentToken ? nextToken() : ts.scanner.getToken();
-            if (token === 133) {
+            if (token === 133 /* RequireKeyword */) {
                 token = nextToken();
-                if (token === 19) {
+                if (token === 19 /* OpenParenToken */) {
                     token = nextToken();
-                    if (token === 9) {
+                    if (token === 9 /* StringLiteral */) {
+                        //  require("mod");
                         recordModuleName();
                     }
                 }
@@ -79370,27 +96621,33 @@ var ts;
         }
         function tryConsumeDefine() {
             var token = ts.scanner.getToken();
-            if (token === 71 && ts.scanner.getTokenValue() === "define") {
+            if (token === 71 /* Identifier */ && ts.scanner.getTokenValue() === "define") {
                 token = nextToken();
-                if (token !== 19) {
+                if (token !== 19 /* OpenParenToken */) {
                     return true;
                 }
                 token = nextToken();
-                if (token === 9) {
+                if (token === 9 /* StringLiteral */) {
+                    // looks like define ("modname", ... - skip string literal and comma
                     token = nextToken();
-                    if (token === 26) {
+                    if (token === 26 /* CommaToken */) {
                         token = nextToken();
                     }
                     else {
+                        // unexpected token
                         return true;
                     }
                 }
-                if (token !== 21) {
+                // should be start of dependency list
+                if (token !== 21 /* OpenBracketToken */) {
                     return true;
                 }
+                // skip open bracket
                 token = nextToken();
-                while (token !== 22 && token !== 1) {
-                    if (token === 9) {
+                // scan until ']' or EOF
+                while (token !== 22 /* CloseBracketToken */ && token !== 1 /* EndOfFileToken */) {
+                    // record string literals as module names
+                    if (token === 9 /* StringLiteral */) {
                         recordModuleName();
                     }
                     token = nextToken();
@@ -79402,14 +96659,30 @@ var ts;
         function processImports() {
             ts.scanner.setText(sourceText);
             nextToken();
+            // Look for:
+            //    import "mod";
+            //    import d from "mod"
+            //    import {a as A } from "mod";
+            //    import * as NS from "mod"
+            //    import d, {a, b as B} from "mod"
+            //    import i = require("mod");
+            //    import("mod");
+            //    export * from "mod"
+            //    export {a as b} from "mod"
+            //    export import i = require("mod")
+            //    (for JavaScript files) require("mod")
+            // Do not look for:
+            //    AnySymbol.import("mod")
+            //    AnySymbol.nested.import("mod")
             while (true) {
-                if (ts.scanner.getToken() === 1) {
+                if (ts.scanner.getToken() === 1 /* EndOfFileToken */) {
                     break;
                 }
+                // check if at least one of alternative have moved scanner forward
                 if (tryConsumeDeclare() ||
                     tryConsumeImport() ||
                     tryConsumeExport() ||
-                    (detectJavaScriptImports && (tryConsumeRequireCall(false) || tryConsumeDefine()))) {
+                    (detectJavaScriptImports && (tryConsumeRequireCall(/*skipCurrentToken*/ false) || tryConsumeDefine()))) {
                     continue;
                 }
                 else {
@@ -79424,15 +96697,18 @@ var ts;
         ts.processCommentPragmas(pragmaContext, sourceText);
         ts.processPragmasIntoFields(pragmaContext, ts.noop);
         if (externalModule) {
+            // for external modules module all nested ambient modules are augmentations
             if (ambientExternalModules) {
+                // move all detected ambient modules to imported files since they need to be resolved
                 for (var _i = 0, ambientExternalModules_1 = ambientExternalModules; _i < ambientExternalModules_1.length; _i++) {
                     var decl = ambientExternalModules_1[_i];
                     importedFiles.push(decl.ref);
                 }
             }
-            return { referencedFiles: pragmaContext.referencedFiles, typeReferenceDirectives: pragmaContext.typeReferenceDirectives, importedFiles: importedFiles, isLibFile: !!pragmaContext.hasNoDefaultLib, ambientExternalModules: undefined };
+            return { referencedFiles: pragmaContext.referencedFiles, typeReferenceDirectives: pragmaContext.typeReferenceDirectives, libReferenceDirectives: pragmaContext.libReferenceDirectives, importedFiles: importedFiles, isLibFile: !!pragmaContext.hasNoDefaultLib, ambientExternalModules: undefined };
         }
         else {
+            // for global scripts ambient modules still can have augmentations - look for ambient modules with depth > 0
             var ambientModuleNames = void 0;
             if (ambientExternalModules) {
                 for (var _a = 0, ambientExternalModules_2 = ambientExternalModules; _a < ambientExternalModules_2.length; _a++) {
@@ -79448,18 +96724,19 @@ var ts;
                     }
                 }
             }
-            return { referencedFiles: pragmaContext.referencedFiles, typeReferenceDirectives: pragmaContext.typeReferenceDirectives, importedFiles: importedFiles, isLibFile: !!pragmaContext.hasNoDefaultLib, ambientExternalModules: ambientModuleNames };
+            return { referencedFiles: pragmaContext.referencedFiles, typeReferenceDirectives: pragmaContext.typeReferenceDirectives, libReferenceDirectives: pragmaContext.libReferenceDirectives, importedFiles: importedFiles, isLibFile: !!pragmaContext.hasNoDefaultLib, ambientExternalModules: ambientModuleNames };
         }
     }
     ts.preProcessFile = preProcessFile;
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var Rename;
     (function (Rename) {
         function getRenameInfo(typeChecker, defaultLibFileName, getCanonicalFileName, sourceFile, position) {
             var getCanonicalDefaultLibName = ts.memoize(function () { return getCanonicalFileName(ts.normalizePath(defaultLibFileName)); });
-            var node = ts.getTouchingPropertyName(sourceFile, position, true);
+            var node = ts.getTouchingPropertyName(sourceFile, position);
             var renameInfo = node && nodeIsEligibleForRename(node)
                 ? getRenameInfoForNode(node, typeChecker, sourceFile, isDefinedInLibraryFile)
                 : undefined;
@@ -79478,19 +96755,23 @@ var ts;
             var symbol = typeChecker.getSymbolAtLocation(node);
             if (!symbol)
                 return;
+            // Only allow a symbol to be renamed if it actually has at least one declaration.
             var declarations = symbol.declarations;
             if (!declarations || declarations.length === 0)
                 return;
+            // Disallow rename for elements that are defined in the standard TypeScript library.
             if (declarations.some(isDefinedInLibraryFile)) {
                 return getRenameInfoError(ts.Diagnostics.You_cannot_rename_elements_that_are_defined_in_the_standard_TypeScript_library);
             }
-            if (ts.isIdentifier(node) && node.originalKeywordKind === 79 && symbol.parent.flags & 1536) {
+            // Cannot rename `default` as in `import { default as foo } from "./someModule";
+            if (ts.isIdentifier(node) && node.originalKeywordKind === 79 /* DefaultKeyword */ && symbol.parent.flags & 1536 /* Module */) {
                 return undefined;
             }
+            // Can't rename a module name.
             if (ts.isStringLiteralLike(node) && ts.tryGetImportFromModuleSpecifier(node))
                 return undefined;
             var kind = ts.SymbolDisplay.getSymbolKind(typeChecker, symbol, node);
-            var specifierName = (ts.isImportOrExportSpecifierName(node) || ts.isStringOrNumericLiteral(node) && node.parent.kind === 147)
+            var specifierName = (ts.isImportOrExportSpecifierName(node) || ts.isStringOrNumericLiteral(node) && node.parent.kind === 147 /* ComputedPropertyName */)
                 ? ts.stripQuotes(ts.getTextOfIdentifierOrLiteral(node))
                 : undefined;
             var displayName = specifierName || typeChecker.symbolToString(symbol);
@@ -79509,6 +96790,7 @@ var ts;
             };
         }
         function getRenameInfoError(diagnostic) {
+            // TODO: GH#18217
             return {
                 canRename: false,
                 localizedErrorMessage: ts.getLocaleSpecificMessage(diagnostic),
@@ -79522,7 +96804,8 @@ var ts;
         function createTriggerSpanForNode(node, sourceFile) {
             var start = node.getStart(sourceFile);
             var width = node.getWidth(sourceFile);
-            if (node.kind === 9) {
+            if (node.kind === 9 /* StringLiteral */) {
+                // Exclude the quotes
                 start += 1;
                 width -= 2;
             }
@@ -79530,11 +96813,11 @@ var ts;
         }
         function nodeIsEligibleForRename(node) {
             switch (node.kind) {
-                case 71:
-                case 9:
-                case 99:
+                case 71 /* Identifier */:
+                case 9 /* StringLiteral */:
+                case 99 /* ThisKeyword */:
                     return true;
-                case 8:
+                case 8 /* NumericLiteral */:
                     return ts.isLiteralNameOfPropertyDeclarationOrIndexAccess(node);
                 default:
                     return false;
@@ -79542,6 +96825,7 @@ var ts;
         }
     })(Rename = ts.Rename || (ts.Rename = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var SignatureHelp;
@@ -79560,17 +96844,22 @@ var ts;
         })(InvocationKind || (InvocationKind = {}));
         function getSignatureHelpItems(program, sourceFile, position, cancellationToken) {
             var typeChecker = program.getTypeChecker();
+            // Decide whether to show signature help
             var startingToken = ts.findTokenOnLeftOfPosition(sourceFile, position);
             if (!startingToken) {
+                // We are at the beginning of the file
                 return undefined;
             }
             var argumentInfo = getContainingArgumentInfo(startingToken, position, sourceFile);
             if (!argumentInfo)
                 return undefined;
             cancellationToken.throwIfCancellationRequested();
+            // Semantic filtering of signature help
             var candidateInfo = getCandidateInfo(argumentInfo, typeChecker);
             cancellationToken.throwIfCancellationRequested();
             if (!candidateInfo) {
+                // We didn't have any sig help items produced by the TS compiler.  If this is a JS
+                // file, then see if we can figure out anything better.
                 if (ts.isSourceFileJavaScript(sourceFile)) {
                     return createJavaScriptSignatureHelpItems(argumentInfo, program, cancellationToken);
                 }
@@ -79581,30 +96870,31 @@ var ts;
         SignatureHelp.getSignatureHelpItems = getSignatureHelpItems;
         function getCandidateInfo(argumentInfo, checker) {
             var invocation = argumentInfo.invocation;
-            if (invocation.kind === 0) {
+            if (invocation.kind === 0 /* Call */) {
                 var candidates = [];
-                var resolvedSignature = checker.getResolvedSignature(invocation.node, candidates, argumentInfo.argumentCount);
+                var resolvedSignature = checker.getResolvedSignature(invocation.node, candidates, argumentInfo.argumentCount); // TODO: GH#18217
                 return candidates.length === 0 ? undefined : { candidates: candidates, resolvedSignature: resolvedSignature };
             }
             else {
-                var type = checker.getTypeAtLocation(invocation.called);
+                var type = checker.getTypeAtLocation(invocation.called); // TODO: GH#18217
                 var signatures = ts.isNewExpression(invocation.called.parent) ? type.getConstructSignatures() : type.getCallSignatures();
                 var candidates = signatures.filter(function (candidate) { return !!candidate.typeParameters && candidate.typeParameters.length >= argumentInfo.argumentCount; });
                 return candidates.length === 0 ? undefined : { candidates: candidates, resolvedSignature: ts.first(candidates) };
             }
         }
         function createJavaScriptSignatureHelpItems(argumentInfo, program, cancellationToken) {
+            // See if we can find some symbol with the call expression name that has call signatures.
             var expression = getExpressionFromInvocation(argumentInfo.invocation);
             var name = ts.isIdentifier(expression) ? expression : ts.isPropertyAccessExpression(expression) ? expression.name : undefined;
             if (!name || !name.escapedText) {
                 return undefined;
             }
             var typeChecker = program.getTypeChecker();
-            var _loop_17 = function (sourceFile) {
+            var _loop_6 = function (sourceFile) {
                 var nameToDeclarations = sourceFile.getNamedDeclarations();
                 var declarations = nameToDeclarations.get(name.text);
                 if (declarations) {
-                    var _loop_18 = function (declaration) {
+                    var _loop_7 = function (declaration) {
                         var symbol = declaration.symbol;
                         if (symbol) {
                             var type = typeChecker.getTypeOfSymbolAtLocation(symbol, declaration);
@@ -79616,67 +96906,96 @@ var ts;
                             }
                         }
                     };
-                    for (var _i = 0, declarations_13 = declarations; _i < declarations_13.length; _i++) {
-                        var declaration = declarations_13[_i];
-                        var state_6 = _loop_18(declaration);
-                        if (typeof state_6 === "object")
-                            return state_6;
+                    for (var _i = 0, declarations_4 = declarations; _i < declarations_4.length; _i++) {
+                        var declaration = declarations_4[_i];
+                        var state_3 = _loop_7(declaration);
+                        if (typeof state_3 === "object")
+                            return state_3;
                     }
                 }
             };
             for (var _i = 0, _a = program.getSourceFiles(); _i < _a.length; _i++) {
                 var sourceFile = _a[_i];
-                var state_5 = _loop_17(sourceFile);
-                if (typeof state_5 === "object")
-                    return state_5.value;
+                var state_2 = _loop_6(sourceFile);
+                if (typeof state_2 === "object")
+                    return state_2.value;
             }
         }
         function getArgumentInfoForCompletions(node, position, sourceFile) {
             var info = getImmediatelyContainingArgumentInfo(node, position, sourceFile);
-            return !info || info.kind === 0 || info.invocation.kind === 1 ? undefined
+            return !info || info.kind === 0 /* TypeArguments */ || info.invocation.kind === 1 /* TypeArgs */ ? undefined
                 : { invocation: info.invocation.node, argumentCount: info.argumentCount, argumentIndex: info.argumentIndex };
         }
         SignatureHelp.getArgumentInfoForCompletions = getArgumentInfoForCompletions;
+        /**
+         * Returns relevant information for the argument list and the current argument if we are
+         * in the argument of an invocation; returns undefined otherwise.
+         */
         function getImmediatelyContainingArgumentInfo(node, position, sourceFile) {
             var parent = node.parent;
             if (ts.isCallOrNewExpression(parent)) {
                 var invocation = parent;
                 var list = void 0;
                 var argumentIndex = void 0;
-                if (node.kind === 27 || node.kind === 19) {
+                // There are 3 cases to handle:
+                //   1. The token introduces a list, and should begin a signature help session
+                //   2. The token is either not associated with a list, or ends a list, so the session should end
+                //   3. The token is buried inside a list, and should give signature help
+                //
+                // The following are examples of each:
+                //
+                //    Case 1:
+                //          foo<#T, U>(#a, b)    -> The token introduces a list, and should begin a signature help session
+                //    Case 2:
+                //          fo#o<T, U>#(a, b)#   -> The token is either not associated with a list, or ends a list, so the session should end
+                //    Case 3:
+                //          foo<T#, U#>(a#, #b#) -> The token is buried inside a list, and should give signature help
+                // Find out if 'node' is an argument, a type argument, or neither
+                if (node.kind === 27 /* LessThanToken */ || node.kind === 19 /* OpenParenToken */) {
+                    // Find the list that starts right *after* the < or ( token.
+                    // If the user has just opened a list, consider this item 0.
                     list = getChildListThatStartsWithOpenerToken(parent, node, sourceFile);
                     ts.Debug.assert(list !== undefined);
                     argumentIndex = 0;
                 }
                 else {
+                    // findListItemInfo can return undefined if we are not in parent's argument list
+                    // or type argument list. This includes cases where the cursor is:
+                    //   - To the right of the closing parenthesis, non-substitution template, or template tail.
+                    //   - Between the type arguments and the arguments (greater than token)
+                    //   - On the target of the call (parent.func)
+                    //   - On the 'new' keyword in a 'new' expression
                     list = ts.findContainingList(node);
                     if (!list)
                         return undefined;
                     argumentIndex = getArgumentIndex(list, node);
                 }
-                var kind = parent.typeArguments && parent.typeArguments.pos === list.pos ? 0 : 1;
+                var kind = parent.typeArguments && parent.typeArguments.pos === list.pos ? 0 /* TypeArguments */ : 1 /* CallArguments */;
                 var argumentCount = getArgumentCount(list);
                 if (argumentIndex !== 0) {
                     ts.Debug.assertLessThan(argumentIndex, argumentCount);
                 }
                 var argumentsSpan = getApplicableSpanForArguments(list, sourceFile);
-                return { kind: kind, invocation: { kind: 0, node: invocation }, argumentsSpan: argumentsSpan, argumentIndex: argumentIndex, argumentCount: argumentCount };
+                return { kind: kind, invocation: { kind: 0 /* Call */, node: invocation }, argumentsSpan: argumentsSpan, argumentIndex: argumentIndex, argumentCount: argumentCount };
             }
             else if (ts.isNoSubstitutionTemplateLiteral(node) && ts.isTaggedTemplateExpression(parent)) {
+                // Check if we're actually inside the template;
+                // otherwise we'll fall out and return undefined.
                 if (ts.isInsideTemplateLiteral(node, position, sourceFile)) {
-                    return getArgumentListInfoForTemplate(parent, 0, sourceFile);
+                    return getArgumentListInfoForTemplate(parent, /*argumentIndex*/ 0, sourceFile);
                 }
             }
-            else if (ts.isTemplateHead(node) && parent.parent.kind === 189) {
+            else if (ts.isTemplateHead(node) && parent.parent.kind === 189 /* TaggedTemplateExpression */) {
                 var templateExpression = parent;
                 var tagExpression = templateExpression.parent;
-                ts.Debug.assert(templateExpression.kind === 202);
+                ts.Debug.assert(templateExpression.kind === 202 /* TemplateExpression */);
                 var argumentIndex = ts.isInsideTemplateLiteral(node, position, sourceFile) ? 0 : 1;
                 return getArgumentListInfoForTemplate(tagExpression, argumentIndex, sourceFile);
             }
             else if (ts.isTemplateSpan(parent) && ts.isTaggedTemplateExpression(parent.parent.parent)) {
                 var templateSpan = parent;
                 var tagExpression = parent.parent.parent;
+                // If we're just after a template tail, don't show signature help.
                 if (ts.isTemplateTail(node) && !ts.isInsideTemplateLiteral(node, position, sourceFile)) {
                     return undefined;
                 }
@@ -79685,11 +97004,16 @@ var ts;
                 return getArgumentListInfoForTemplate(tagExpression, argumentIndex, sourceFile);
             }
             else if (ts.isJsxOpeningLikeElement(parent)) {
+                // Provide a signature help for JSX opening element or JSX self-closing element.
+                // This is not guarantee that JSX tag-name is resolved into stateless function component. (that is done in "getSignatureHelpItems")
+                // i.e
+                //      export function MainButton(props: ButtonProps, context: any): JSX.Element { ... }
+                //      <MainButton /*signatureHelp*/
                 var attributeSpanStart = parent.attributes.pos;
-                var attributeSpanEnd = ts.skipTrivia(sourceFile.text, parent.attributes.end, false);
+                var attributeSpanEnd = ts.skipTrivia(sourceFile.text, parent.attributes.end, /*stopAfterLineBreak*/ false);
                 return {
-                    kind: 3,
-                    invocation: { kind: 0, node: parent },
+                    kind: 3 /* JSXAttributesArguments */,
+                    invocation: { kind: 0 /* Call */, node: parent },
                     argumentsSpan: ts.createTextSpan(attributeSpanStart, attributeSpanEnd - attributeSpanStart),
                     argumentIndex: 0,
                     argumentCount: 1
@@ -79699,35 +97023,72 @@ var ts;
                 var typeArgInfo = ts.isPossiblyTypeArgumentPosition(node, sourceFile);
                 if (typeArgInfo) {
                     var called = typeArgInfo.called, nTypeArguments = typeArgInfo.nTypeArguments;
-                    var invocation = { kind: 1, called: called };
+                    var invocation = { kind: 1 /* TypeArgs */, called: called };
                     var argumentsSpan = ts.createTextSpanFromBounds(called.getStart(sourceFile), node.end);
-                    return { kind: 0, invocation: invocation, argumentsSpan: argumentsSpan, argumentIndex: nTypeArguments, argumentCount: nTypeArguments + 1 };
+                    return { kind: 0 /* TypeArguments */, invocation: invocation, argumentsSpan: argumentsSpan, argumentIndex: nTypeArguments, argumentCount: nTypeArguments + 1 };
                 }
             }
             return undefined;
         }
         function getArgumentIndex(argumentsList, node) {
+            // The list we got back can include commas.  In the presence of errors it may
+            // also just have nodes without commas.  For example "Foo(a b c)" will have 3
+            // args without commas. We want to find what index we're at.  So we count
+            // forward until we hit ourselves, only incrementing the index if it isn't a
+            // comma.
+            //
+            // Note: the subtlety around trailing commas (in getArgumentCount) does not apply
+            // here.  That's because we're only walking forward until we hit the node we're
+            // on.  In that case, even if we're after the trailing comma, we'll still see
+            // that trailing comma in the list, and we'll have generated the appropriate
+            // arg index.
             var argumentIndex = 0;
             for (var _i = 0, _a = argumentsList.getChildren(); _i < _a.length; _i++) {
                 var child = _a[_i];
                 if (child === node) {
                     break;
                 }
-                if (child.kind !== 26) {
+                if (child.kind !== 26 /* CommaToken */) {
                     argumentIndex++;
                 }
             }
             return argumentIndex;
         }
         function getArgumentCount(argumentsList) {
+            // The argument count for a list is normally the number of non-comma children it has.
+            // For example, if you have "Foo(a,b)" then there will be three children of the arg
+            // list 'a' '<comma>' 'b'.  So, in this case the arg count will be 2.  However, there
+            // is a small subtlety.  If you have "Foo(a,)", then the child list will just have
+            // 'a' '<comma>'.  So, in the case where the last child is a comma, we increase the
+            // arg count by one to compensate.
+            //
+            // Note: this subtlety only applies to the last comma.  If you had "Foo(a,," then
+            // we'll have: 'a' '<comma>' '<missing>'
+            // That will give us 2 non-commas.  We then add one for the last comma, giving us an
+            // arg count of 3.
             var listChildren = argumentsList.getChildren();
-            var argumentCount = ts.countWhere(listChildren, function (arg) { return arg.kind !== 26; });
-            if (listChildren.length > 0 && ts.last(listChildren).kind === 26) {
+            var argumentCount = ts.countWhere(listChildren, function (arg) { return arg.kind !== 26 /* CommaToken */; });
+            if (listChildren.length > 0 && ts.last(listChildren).kind === 26 /* CommaToken */) {
                 argumentCount++;
             }
             return argumentCount;
         }
+        // spanIndex is either the index for a given template span.
+        // This does not give appropriate results for a NoSubstitutionTemplateLiteral
         function getArgumentIndexForTemplatePiece(spanIndex, node, position, sourceFile) {
+            // Because the TemplateStringsArray is the first argument, we have to offset each substitution expression by 1.
+            // There are three cases we can encounter:
+            //      1. We are precisely in the template literal (argIndex = 0).
+            //      2. We are in or to the right of the substitution expression (argIndex = spanIndex + 1).
+            //      3. We are directly to the right of the template literal, but because we look for the token on the left,
+            //          not enough to put us in the substitution expression; we should consider ourselves part of
+            //          the *next* span's expression by offsetting the index (argIndex = (spanIndex + 1) + 1).
+            //
+            // tslint:disable no-double-space
+            // Example: f  `# abcd $#{#  1 + 1#  }# efghi ${ #"#hello"#  }  #  `
+            //              ^       ^ ^       ^   ^          ^ ^      ^     ^
+            // Case:        1       1 3       2   1          3 2      2     1
+            // tslint:enable no-double-space
             ts.Debug.assert(position >= node.getStart(), "Assumed 'position' could not occur before node.");
             if (ts.isTemplateLiteralToken(node)) {
                 if (ts.isInsideTemplateLiteral(node, position, sourceFile)) {
@@ -79738,37 +97099,56 @@ var ts;
             return spanIndex + 1;
         }
         function getArgumentListInfoForTemplate(tagExpression, argumentIndex, sourceFile) {
+            // argumentCount is either 1 or (numSpans + 1) to account for the template strings array argument.
             var argumentCount = ts.isNoSubstitutionTemplateLiteral(tagExpression.template) ? 1 : tagExpression.template.templateSpans.length + 1;
             if (argumentIndex !== 0) {
                 ts.Debug.assertLessThan(argumentIndex, argumentCount);
             }
             return {
-                kind: 2,
-                invocation: { kind: 0, node: tagExpression },
+                kind: 2 /* TaggedTemplateArguments */,
+                invocation: { kind: 0 /* Call */, node: tagExpression },
                 argumentsSpan: getApplicableSpanForTaggedTemplate(tagExpression, sourceFile),
                 argumentIndex: argumentIndex,
                 argumentCount: argumentCount
             };
         }
         function getApplicableSpanForArguments(argumentsList, sourceFile) {
+            // We use full start and skip trivia on the end because we want to include trivia on
+            // both sides. For example,
+            //
+            //    foo(   /*comment */     a, b, c      /*comment*/     )
+            //        |                                               |
+            //
+            // The applicable span is from the first bar to the second bar (inclusive,
+            // but not including parentheses)
             var applicableSpanStart = argumentsList.getFullStart();
-            var applicableSpanEnd = ts.skipTrivia(sourceFile.text, argumentsList.getEnd(), false);
+            var applicableSpanEnd = ts.skipTrivia(sourceFile.text, argumentsList.getEnd(), /*stopAfterLineBreak*/ false);
             return ts.createTextSpan(applicableSpanStart, applicableSpanEnd - applicableSpanStart);
         }
         function getApplicableSpanForTaggedTemplate(taggedTemplate, sourceFile) {
             var template = taggedTemplate.template;
             var applicableSpanStart = template.getStart();
             var applicableSpanEnd = template.getEnd();
-            if (template.kind === 202) {
+            // We need to adjust the end position for the case where the template does not have a tail.
+            // Otherwise, we will not show signature help past the expression.
+            // For example,
+            //
+            //      ` ${ 1 + 1 foo(10)
+            //       |       |
+            // This is because a Missing node has no width. However, what we actually want is to include trivia
+            // leading up to the next token in case the user is about to type in a TemplateMiddle or TemplateTail.
+            if (template.kind === 202 /* TemplateExpression */) {
                 var lastSpan = ts.last(template.templateSpans);
                 if (lastSpan.literal.getFullWidth() === 0) {
-                    applicableSpanEnd = ts.skipTrivia(sourceFile.text, applicableSpanEnd, false);
+                    applicableSpanEnd = ts.skipTrivia(sourceFile.text, applicableSpanEnd, /*stopAfterLineBreak*/ false);
                 }
             }
             return ts.createTextSpan(applicableSpanStart, applicableSpanEnd - applicableSpanStart);
         }
         function getContainingArgumentInfo(node, position, sourceFile) {
-            var _loop_19 = function (n) {
+            var _loop_8 = function (n) {
+                // If the node is not a subspan of its parent, this is a big problem.
+                // There have been crashes that might be caused by this violation.
                 ts.Debug.assert(ts.rangeContainsRange(n.parent, n), "Not a subspan", function () { return "Child: " + ts.Debug.showSyntaxKind(n) + ", parent: " + ts.Debug.showSyntaxKind(n.parent); });
                 var argumentInfo = getImmediatelyContainingArgumentInfo(n, position, sourceFile);
                 if (argumentInfo) {
@@ -79776,9 +97156,9 @@ var ts;
                 }
             };
             for (var n = node; !ts.isBlock(n) && !ts.isSourceFile(n); n = n.parent) {
-                var state_7 = _loop_19(n);
-                if (typeof state_7 === "object")
-                    return state_7.value;
+                var state_4 = _loop_8(n);
+                if (typeof state_4 === "object")
+                    return state_4.value;
             }
             return undefined;
         }
@@ -79789,15 +97169,15 @@ var ts;
             return children[indexOfOpenerToken + 1];
         }
         function getExpressionFromInvocation(invocation) {
-            return invocation.kind === 0 ? ts.getInvokedExpression(invocation.node) : invocation.called;
+            return invocation.kind === 0 /* Call */ ? ts.getInvokedExpression(invocation.node) : invocation.called;
         }
-        var signatureHelpNodeBuilderFlags = 8192 | 3112960;
+        var signatureHelpNodeBuilderFlags = 8192 /* OmitParameterModifiers */ | 3112960 /* IgnoreErrors */;
         function createSignatureHelpItems(candidates, resolvedSignature, argumentListInfo, sourceFile, typeChecker) {
             var argumentCount = argumentListInfo.argumentCount, applicableSpan = argumentListInfo.argumentsSpan, invocation = argumentListInfo.invocation, argumentIndex = argumentListInfo.argumentIndex;
-            var isTypeParameterList = argumentListInfo.kind === 0;
-            var enclosingDeclaration = invocation.kind === 0 ? invocation.node : invocation.called;
+            var isTypeParameterList = argumentListInfo.kind === 0 /* TypeArguments */;
+            var enclosingDeclaration = invocation.kind === 0 /* Call */ ? invocation.node : invocation.called;
             var callTargetSymbol = typeChecker.getSymbolAtLocation(getExpressionFromInvocation(invocation));
-            var callTargetDisplayParts = callTargetSymbol && ts.symbolToDisplayParts(typeChecker, callTargetSymbol, undefined, undefined);
+            var callTargetDisplayParts = callTargetSymbol && ts.symbolToDisplayParts(typeChecker, callTargetSymbol, /*enclosingDeclaration*/ undefined, /*meaning*/ undefined);
             var printer = ts.createPrinter({ removeComments: true });
             var items = candidates.map(function (candidateSignature) {
                 var signatureHelpParameters;
@@ -79808,15 +97188,15 @@ var ts;
                 }
                 var isVariadic;
                 if (isTypeParameterList) {
-                    isVariadic = false;
-                    prefixDisplayParts.push(ts.punctuationPart(27));
+                    isVariadic = false; // type parameter lists are not variadic
+                    prefixDisplayParts.push(ts.punctuationPart(27 /* LessThanToken */));
                     var typeParameters = (candidateSignature.target || candidateSignature).typeParameters;
                     signatureHelpParameters = typeParameters && typeParameters.length > 0 ? ts.map(typeParameters, createSignatureHelpParameterForTypeParameter) : ts.emptyArray;
-                    suffixDisplayParts.push(ts.punctuationPart(29));
+                    suffixDisplayParts.push(ts.punctuationPart(29 /* GreaterThanToken */));
                     var parameterParts = ts.mapToDisplayParts(function (writer) {
                         var thisParameter = candidateSignature.thisParameter ? [typeChecker.symbolToParameterDeclaration(candidateSignature.thisParameter, enclosingDeclaration, signatureHelpNodeBuilderFlags)] : [];
                         var params = ts.createNodeArray(thisParameter.concat(candidateSignature.parameters.map(function (param) { return typeChecker.symbolToParameterDeclaration(param, enclosingDeclaration, signatureHelpNodeBuilderFlags); })));
-                        printer.writeList(1296, params, sourceFile, writer);
+                        printer.writeList(1296 /* CallExpressionArguments */, params, sourceFile, writer);
                     });
                     ts.addRange(suffixDisplayParts, parameterParts);
                 }
@@ -79825,23 +97205,23 @@ var ts;
                     var typeParameterParts = ts.mapToDisplayParts(function (writer) {
                         if (candidateSignature.typeParameters && candidateSignature.typeParameters.length) {
                             var args = ts.createNodeArray(candidateSignature.typeParameters.map(function (p) { return typeChecker.typeParameterToDeclaration(p, enclosingDeclaration); }));
-                            printer.writeList(26896, args, sourceFile, writer);
+                            printer.writeList(26896 /* TypeParameters */, args, sourceFile, writer);
                         }
                     });
                     ts.addRange(prefixDisplayParts, typeParameterParts);
-                    prefixDisplayParts.push(ts.punctuationPart(19));
+                    prefixDisplayParts.push(ts.punctuationPart(19 /* OpenParenToken */));
                     signatureHelpParameters = ts.map(candidateSignature.parameters, createSignatureHelpParameterForParameter);
-                    suffixDisplayParts.push(ts.punctuationPart(20));
+                    suffixDisplayParts.push(ts.punctuationPart(20 /* CloseParenToken */));
                 }
                 var returnTypeParts = ts.mapToDisplayParts(function (writer) {
                     writer.writePunctuation(":");
                     writer.writeSpace(" ");
                     var predicate = typeChecker.getTypePredicateOfSignature(candidateSignature);
                     if (predicate) {
-                        typeChecker.writeTypePredicate(predicate, enclosingDeclaration, undefined, writer);
+                        typeChecker.writeTypePredicate(predicate, enclosingDeclaration, /*flags*/ undefined, writer);
                     }
                     else {
-                        typeChecker.writeType(typeChecker.getReturnTypeOfSignature(candidateSignature), enclosingDeclaration, undefined, writer);
+                        typeChecker.writeType(typeChecker.getReturnTypeOfSignature(candidateSignature), enclosingDeclaration, /*flags*/ undefined, writer);
                     }
                 });
                 ts.addRange(suffixDisplayParts, returnTypeParts);
@@ -79849,7 +97229,7 @@ var ts;
                     isVariadic: isVariadic,
                     prefixDisplayParts: prefixDisplayParts,
                     suffixDisplayParts: suffixDisplayParts,
-                    separatorDisplayParts: [ts.punctuationPart(26), ts.spacePart()],
+                    separatorDisplayParts: [ts.punctuationPart(26 /* CommaToken */), ts.spacePart()],
                     parameters: signatureHelpParameters,
                     documentation: candidateSignature.getDocumentationComment(typeChecker),
                     tags: candidateSignature.getJsDocTags()
@@ -79859,12 +97239,12 @@ var ts;
                 ts.Debug.assertLessThan(argumentIndex, argumentCount);
             }
             var selectedItemIndex = candidates.indexOf(resolvedSignature);
-            ts.Debug.assert(selectedItemIndex !== -1);
+            ts.Debug.assert(selectedItemIndex !== -1); // If candidates is non-empty it should always include bestSignature. We check for an empty candidates before calling this function.
             return { items: items, applicableSpan: applicableSpan, selectedItemIndex: selectedItemIndex, argumentIndex: argumentIndex, argumentCount: argumentCount };
             function createSignatureHelpParameterForParameter(parameter) {
                 var displayParts = ts.mapToDisplayParts(function (writer) {
                     var param = typeChecker.symbolToParameterDeclaration(parameter, enclosingDeclaration, signatureHelpNodeBuilderFlags);
-                    printer.writeNode(4, param, sourceFile, writer);
+                    printer.writeNode(4 /* Unspecified */, param, sourceFile, writer);
                 });
                 return {
                     name: parameter.name,
@@ -79876,7 +97256,7 @@ var ts;
             function createSignatureHelpParameterForTypeParameter(typeParameter) {
                 var displayParts = ts.mapToDisplayParts(function (writer) {
                     var param = typeChecker.typeParameterToDeclaration(typeParameter, enclosingDeclaration);
-                    printer.writeNode(4, param, sourceFile, writer);
+                    printer.writeNode(4 /* Unspecified */, param, sourceFile, writer);
                 });
                 return {
                     name: typeParameter.symbol.name,
@@ -79888,6 +97268,7 @@ var ts;
         }
     })(SignatureHelp = ts.SignatureHelp || (ts.SignatureHelp = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     function computeSuggestionDiagnostics(sourceFile, program, cancellationToken) {
@@ -79907,8 +97288,8 @@ var ts;
                 var name = importNameForConvertToDefaultImport(importNode);
                 if (!name)
                     continue;
-                var module_2 = ts.getResolvedModule(sourceFile, moduleSpecifier.text);
-                var resolvedFile = module_2 && program.getSourceFile(module_2.resolvedFileName);
+                var module = ts.getResolvedModule(sourceFile, moduleSpecifier.text);
+                var resolvedFile = module && program.getSourceFile(module.resolvedFileName);
                 if (resolvedFile && resolvedFile.externalModuleIndicator && ts.isExportAssignment(resolvedFile.externalModuleIndicator) && resolvedFile.externalModuleIndicator.isExportEquals) {
                     diags.push(ts.createDiagnosticForNode(name, ts.Diagnostics.Import_may_be_converted_to_a_default_import));
                 }
@@ -79920,16 +97301,17 @@ var ts;
         function check(node) {
             if (isJsFile) {
                 switch (node.kind) {
-                    case 192:
+                    case 192 /* FunctionExpression */:
                         var decl = ts.getDeclarationOfJSInitializer(node);
                         if (decl) {
-                            var symbol_3 = decl.symbol;
-                            if (symbol_3 && (symbol_3.exports && symbol_3.exports.size || symbol_3.members && symbol_3.members.size)) {
+                            var symbol_2 = decl.symbol;
+                            if (symbol_2 && (symbol_2.exports && symbol_2.exports.size || symbol_2.members && symbol_2.members.size)) {
                                 diags.push(ts.createDiagnosticForNode(ts.isVariableDeclaration(node.parent) ? node.parent.name : node, ts.Diagnostics.This_constructor_function_may_be_converted_to_a_class_declaration));
                                 break;
                             }
                         }
-                    case 234:
+                    // falls through if no diagnostic was created
+                    case 234 /* FunctionDeclaration */:
                         var symbol = node.symbol;
                         if (symbol.members && (symbol.members.size > 0)) {
                             diags.push(ts.createDiagnosticForNode(ts.isVariableDeclaration(node.parent) ? node.parent.name : node, ts.Diagnostics.This_constructor_function_may_be_converted_to_a_class_declaration));
@@ -79940,10 +97322,10 @@ var ts;
             else {
                 if (ts.isVariableStatement(node) &&
                     node.parent === sourceFile &&
-                    node.declarationList.flags & 2 &&
+                    node.declarationList.flags & 2 /* Const */ &&
                     node.declarationList.declarations.length === 1) {
                     var init = node.declarationList.declarations[0].initializer;
-                    if (init && ts.isRequireCall(init, true)) {
+                    if (init && ts.isRequireCall(init, /*checkArgumentIsStringLiteralLike*/ true)) {
                         diags.push(ts.createDiagnosticForNode(init, ts.Diagnostics.require_call_may_be_converted_to_an_import));
                     }
                 }
@@ -79955,19 +97337,20 @@ var ts;
         }
     }
     ts.computeSuggestionDiagnostics = computeSuggestionDiagnostics;
+    // convertToEs6Module only works on top-level, so don't trigger it if commonjs code only appears in nested scopes.
     function containsTopLevelCommonjs(sourceFile) {
         return sourceFile.statements.some(function (statement) {
             switch (statement.kind) {
-                case 214:
+                case 214 /* VariableStatement */:
                     return statement.declarationList.declarations.some(function (decl) {
-                        return ts.isRequireCall(propertyAccessLeftHandSide(decl.initializer), true);
-                    });
-                case 216: {
+                        return ts.isRequireCall(propertyAccessLeftHandSide(decl.initializer), /*checkArgumentIsStringLiteralLike*/ true);
+                    }); // TODO: GH#18217
+                case 216 /* ExpressionStatement */: {
                     var expression = statement.expression;
                     if (!ts.isBinaryExpression(expression))
-                        return ts.isRequireCall(expression, true);
+                        return ts.isRequireCall(expression, /*checkArgumentIsStringLiteralLike*/ true);
                     var kind = ts.getSpecialPropertyAssignmentKind(expression);
-                    return kind === 1 || kind === 2;
+                    return kind === 1 /* ExportsProperty */ || kind === 2 /* ModuleExports */;
                 }
                 default:
                     return false;
@@ -79979,12 +97362,12 @@ var ts;
     }
     function importNameForConvertToDefaultImport(node) {
         switch (node.kind) {
-            case 244:
+            case 244 /* ImportDeclaration */:
                 var importClause = node.importClause, moduleSpecifier = node.moduleSpecifier;
-                return importClause && !importClause.name && importClause.namedBindings && importClause.namedBindings.kind === 246 && ts.isStringLiteral(moduleSpecifier)
+                return importClause && !importClause.name && importClause.namedBindings && importClause.namedBindings.kind === 246 /* NamespaceImport */ && ts.isStringLiteral(moduleSpecifier)
                     ? importClause.namedBindings.name
                     : undefined;
-            case 243:
+            case 243 /* ImportEqualsDeclaration */:
                 return node.name;
             default:
                 return undefined;
@@ -79994,119 +97377,130 @@ var ts;
         return ts.isBinaryExpression(commonJsModuleIndicator) ? commonJsModuleIndicator.left : commonJsModuleIndicator;
     }
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var SymbolDisplay;
     (function (SymbolDisplay) {
+        // TODO(drosen): use contextual SemanticMeaning.
         function getSymbolKind(typeChecker, symbol, location) {
             var result = getSymbolKindOfConstructorPropertyMethodAccessorFunctionOrVar(typeChecker, symbol, location);
-            if (result !== "") {
+            if (result !== "" /* unknown */) {
                 return result;
             }
             var flags = ts.getCombinedLocalAndExportSymbolFlags(symbol);
-            if (flags & 32) {
-                return ts.getDeclarationOfKind(symbol, 205) ?
-                    "local class" : "class";
+            if (flags & 32 /* Class */) {
+                return ts.getDeclarationOfKind(symbol, 205 /* ClassExpression */) ?
+                    "local class" /* localClassElement */ : "class" /* classElement */;
             }
-            if (flags & 384)
-                return "enum";
-            if (flags & 524288)
-                return "type";
-            if (flags & 64)
-                return "interface";
-            if (flags & 262144)
-                return "type parameter";
-            if (flags & 262144)
-                return "type parameter";
-            if (flags & 8)
-                return "enum member";
-            if (flags & 2097152)
-                return "alias";
-            if (flags & 1536)
-                return "module";
+            if (flags & 384 /* Enum */)
+                return "enum" /* enumElement */;
+            if (flags & 524288 /* TypeAlias */)
+                return "type" /* typeElement */;
+            if (flags & 64 /* Interface */)
+                return "interface" /* interfaceElement */;
+            if (flags & 262144 /* TypeParameter */)
+                return "type parameter" /* typeParameterElement */;
+            if (flags & 262144 /* TypeParameter */)
+                return "type parameter" /* typeParameterElement */;
+            if (flags & 8 /* EnumMember */)
+                return "enum member" /* enumMemberElement */;
+            if (flags & 2097152 /* Alias */)
+                return "alias" /* alias */;
+            if (flags & 1536 /* Module */)
+                return "module" /* moduleElement */;
             return result;
         }
         SymbolDisplay.getSymbolKind = getSymbolKind;
         function getSymbolKindOfConstructorPropertyMethodAccessorFunctionOrVar(typeChecker, symbol, location) {
             var roots = typeChecker.getRootSymbols(symbol);
+            // If this is a method from a mapped type, leave as a method so long as it still has a call signature.
             if (roots.length === 1
-                && ts.first(roots).flags & 8192
+                && ts.first(roots).flags & 8192 /* Method */
+                // Ensure the mapped version is still a method, as opposed to `{ [K in keyof I]: number }`.
                 && typeChecker.getTypeOfSymbolAtLocation(symbol, location).getNonNullableType().getCallSignatures().length !== 0) {
-                return "method";
+                return "method" /* memberFunctionElement */;
             }
             if (typeChecker.isUndefinedSymbol(symbol)) {
-                return "var";
+                return "var" /* variableElement */;
             }
             if (typeChecker.isArgumentsSymbol(symbol)) {
-                return "local var";
+                return "local var" /* localVariableElement */;
             }
-            if (location.kind === 99 && ts.isExpression(location)) {
-                return "parameter";
+            if (location.kind === 99 /* ThisKeyword */ && ts.isExpression(location)) {
+                return "parameter" /* parameterElement */;
             }
             var flags = ts.getCombinedLocalAndExportSymbolFlags(symbol);
-            if (flags & 3) {
+            if (flags & 3 /* Variable */) {
                 if (ts.isFirstDeclarationOfSymbolParameter(symbol)) {
-                    return "parameter";
+                    return "parameter" /* parameterElement */;
                 }
                 else if (symbol.valueDeclaration && ts.isConst(symbol.valueDeclaration)) {
-                    return "const";
+                    return "const" /* constElement */;
                 }
                 else if (ts.forEach(symbol.declarations, ts.isLet)) {
-                    return "let";
+                    return "let" /* letElement */;
                 }
-                return isLocalVariableOrFunction(symbol) ? "local var" : "var";
+                return isLocalVariableOrFunction(symbol) ? "local var" /* localVariableElement */ : "var" /* variableElement */;
             }
-            if (flags & 16)
-                return isLocalVariableOrFunction(symbol) ? "local function" : "function";
-            if (flags & 32768)
-                return "getter";
-            if (flags & 65536)
-                return "setter";
-            if (flags & 8192)
-                return "method";
-            if (flags & 16384)
-                return "constructor";
-            if (flags & 4) {
-                if (flags & 33554432 && symbol.checkFlags & 6) {
+            if (flags & 16 /* Function */)
+                return isLocalVariableOrFunction(symbol) ? "local function" /* localFunctionElement */ : "function" /* functionElement */;
+            if (flags & 32768 /* GetAccessor */)
+                return "getter" /* memberGetAccessorElement */;
+            if (flags & 65536 /* SetAccessor */)
+                return "setter" /* memberSetAccessorElement */;
+            if (flags & 8192 /* Method */)
+                return "method" /* memberFunctionElement */;
+            if (flags & 16384 /* Constructor */)
+                return "constructor" /* constructorImplementationElement */;
+            if (flags & 4 /* Property */) {
+                if (flags & 33554432 /* Transient */ && symbol.checkFlags & 6 /* Synthetic */) {
+                    // If union property is result of union of non method (property/accessors/variables), it is labeled as property
                     var unionPropertyKind = ts.forEach(typeChecker.getRootSymbols(symbol), function (rootSymbol) {
                         var rootSymbolFlags = rootSymbol.getFlags();
-                        if (rootSymbolFlags & (98308 | 3)) {
-                            return "property";
+                        if (rootSymbolFlags & (98308 /* PropertyOrAccessor */ | 3 /* Variable */)) {
+                            return "property" /* memberVariableElement */;
                         }
-                        ts.Debug.assert(!!(rootSymbolFlags & (8192 | 16)));
+                        // May be a Function if this was from `typeof N` with `namespace N { function f();. }`.
+                        ts.Debug.assert(!!(rootSymbolFlags & (8192 /* Method */ | 16 /* Function */)));
                     });
                     if (!unionPropertyKind) {
+                        // If this was union of all methods,
+                        // make sure it has call signatures before we can label it as method
                         var typeOfUnionProperty = typeChecker.getTypeOfSymbolAtLocation(symbol, location);
                         if (typeOfUnionProperty.getCallSignatures().length) {
-                            return "method";
+                            return "method" /* memberFunctionElement */;
                         }
-                        return "property";
+                        return "property" /* memberVariableElement */;
                     }
                     return unionPropertyKind;
                 }
+                // If we requested completions after `x.` at the top-level, we may be at a source file location.
                 switch (location.parent && location.parent.kind) {
-                    case 257:
-                    case 255:
-                    case 256:
-                        return location.kind === 71 ? "property" : "JSX attribute";
-                    case 262:
-                        return "JSX attribute";
+                    // If we've typed a character of the attribute name, will be 'JsxAttribute', else will be 'JsxOpeningElement'.
+                    case 257 /* JsxOpeningElement */:
+                    case 255 /* JsxElement */:
+                    case 256 /* JsxSelfClosingElement */:
+                        return location.kind === 71 /* Identifier */ ? "property" /* memberVariableElement */ : "JSX attribute" /* jsxAttribute */;
+                    case 262 /* JsxAttribute */:
+                        return "JSX attribute" /* jsxAttribute */;
                     default:
-                        return "property";
+                        return "property" /* memberVariableElement */;
                 }
             }
-            return "";
+            return "" /* unknown */;
         }
         function getSymbolModifiers(symbol) {
             var nodeModifiers = symbol && symbol.declarations && symbol.declarations.length > 0
                 ? ts.getNodeModifiers(symbol.declarations[0])
-                : "";
-            var symbolModifiers = symbol && symbol.flags & 16777216 ?
-                "optional"
-                : "";
+                : "" /* none */;
+            var symbolModifiers = symbol && symbol.flags & 16777216 /* Optional */ ?
+                "optional" /* optionalModifier */
+                : "" /* none */;
             return nodeModifiers && symbolModifiers ? nodeModifiers + "," + symbolModifiers : nodeModifiers || symbolModifiers;
         }
         SymbolDisplay.getSymbolModifiers = getSymbolModifiers;
+        // TODO(drosen): Currently completion entry details passes the SemanticMeaning.All instead of using semanticMeaning of location
         function getSymbolDisplayPartsDocumentationAndSymbolKind(typeChecker, symbol, sourceFile, enclosingDeclaration, location, semanticMeaning, alias) {
             if (semanticMeaning === void 0) { semanticMeaning = ts.getMeaningFromLocation(location); }
             var displayParts = [];
@@ -80115,23 +97509,27 @@ var ts;
             var symbolFlags = ts.getCombinedLocalAndExportSymbolFlags(symbol);
             var symbolKind = getSymbolKindOfConstructorPropertyMethodAccessorFunctionOrVar(typeChecker, symbol, location);
             var hasAddedSymbolInfo = false;
-            var isThisExpression = location.kind === 99 && ts.isExpression(location);
+            var isThisExpression = location.kind === 99 /* ThisKeyword */ && ts.isExpression(location);
             var type;
             var printer;
             var documentationFromAlias;
             var tagsFromAlias;
-            if (symbolKind !== "" || symbolFlags & 32 || symbolFlags & 2097152) {
-                if (symbolKind === "getter" || symbolKind === "setter") {
-                    symbolKind = "property";
+            // Class at constructor site need to be shown as constructor apart from property,method, vars
+            if (symbolKind !== "" /* unknown */ || symbolFlags & 32 /* Class */ || symbolFlags & 2097152 /* Alias */) {
+                // If it is accessor they are allowed only if location is at name of the accessor
+                if (symbolKind === "getter" /* memberGetAccessorElement */ || symbolKind === "setter" /* memberSetAccessorElement */) {
+                    symbolKind = "property" /* memberVariableElement */;
                 }
                 var signature = void 0;
                 type = isThisExpression ? typeChecker.getTypeAtLocation(location) : typeChecker.getTypeOfSymbolAtLocation(symbol.exportSymbol || symbol, location);
-                if (location.parent && location.parent.kind === 185) {
+                if (location.parent && location.parent.kind === 185 /* PropertyAccessExpression */) {
                     var right = location.parent.name;
+                    // Either the location is on the right of a property access, or on the left and the right is missing
                     if (right === location || (right && right.getFullWidth() === 0)) {
                         location = location.parent;
                     }
                 }
+                // try get the call/construct signature from the type if it matches
                 var callExpressionLike = void 0;
                 if (ts.isCallOrNewExpression(location)) {
                     callExpressionLike = location;
@@ -80144,23 +97542,26 @@ var ts;
                 }
                 if (callExpressionLike) {
                     var candidateSignatures = [];
-                    signature = typeChecker.getResolvedSignature(callExpressionLike, candidateSignatures);
-                    var useConstructSignatures = callExpressionLike.kind === 188 || (ts.isCallExpression(callExpressionLike) && callExpressionLike.expression.kind === 97);
+                    signature = typeChecker.getResolvedSignature(callExpressionLike, candidateSignatures); // TODO: GH#18217
+                    var useConstructSignatures = callExpressionLike.kind === 188 /* NewExpression */ || (ts.isCallExpression(callExpressionLike) && callExpressionLike.expression.kind === 97 /* SuperKeyword */);
                     var allSignatures = useConstructSignatures ? type.getConstructSignatures() : type.getCallSignatures();
                     if (!ts.contains(allSignatures, signature.target) && !ts.contains(allSignatures, signature)) {
+                        // Get the first signature if there is one -- allSignatures may contain
+                        // either the original signature or its target, so check for either
                         signature = allSignatures.length ? allSignatures[0] : undefined;
                     }
                     if (signature) {
-                        if (useConstructSignatures && (symbolFlags & 32)) {
-                            symbolKind = "constructor";
+                        if (useConstructSignatures && (symbolFlags & 32 /* Class */)) {
+                            // Constructor
+                            symbolKind = "constructor" /* constructorImplementationElement */;
                             addPrefixForAnyFunctionOrVar(type.symbol, symbolKind);
                         }
-                        else if (symbolFlags & 2097152) {
-                            symbolKind = "alias";
+                        else if (symbolFlags & 2097152 /* Alias */) {
+                            symbolKind = "alias" /* alias */;
                             pushSymbolKind(symbolKind);
                             displayParts.push(ts.spacePart());
                             if (useConstructSignatures) {
-                                displayParts.push(ts.keywordPart(94));
+                                displayParts.push(ts.keywordPart(94 /* NewKeyword */));
                                 displayParts.push(ts.spacePart());
                             }
                             addFullSymbolName(symbol);
@@ -80169,139 +97570,154 @@ var ts;
                             addPrefixForAnyFunctionOrVar(symbol, symbolKind);
                         }
                         switch (symbolKind) {
-                            case "JSX attribute":
-                            case "property":
-                            case "var":
-                            case "const":
-                            case "let":
-                            case "parameter":
-                            case "local var":
-                                displayParts.push(ts.punctuationPart(56));
+                            case "JSX attribute" /* jsxAttribute */:
+                            case "property" /* memberVariableElement */:
+                            case "var" /* variableElement */:
+                            case "const" /* constElement */:
+                            case "let" /* letElement */:
+                            case "parameter" /* parameterElement */:
+                            case "local var" /* localVariableElement */:
+                                // If it is call or construct signature of lambda's write type name
+                                displayParts.push(ts.punctuationPart(56 /* ColonToken */));
                                 displayParts.push(ts.spacePart());
-                                if (!(ts.getObjectFlags(type) & 16) && type.symbol) {
-                                    ts.addRange(displayParts, ts.symbolToDisplayParts(typeChecker, type.symbol, enclosingDeclaration, undefined, 4 | 1));
+                                if (!(ts.getObjectFlags(type) & 16 /* Anonymous */) && type.symbol) {
+                                    ts.addRange(displayParts, ts.symbolToDisplayParts(typeChecker, type.symbol, enclosingDeclaration, /*meaning*/ undefined, 4 /* AllowAnyNodeKind */ | 1 /* WriteTypeParametersOrArguments */));
                                     displayParts.push(ts.lineBreakPart());
                                 }
                                 if (useConstructSignatures) {
-                                    displayParts.push(ts.keywordPart(94));
+                                    displayParts.push(ts.keywordPart(94 /* NewKeyword */));
                                     displayParts.push(ts.spacePart());
                                 }
-                                addSignatureDisplayParts(signature, allSignatures, 262144);
+                                addSignatureDisplayParts(signature, allSignatures, 262144 /* WriteArrowStyleSignature */);
                                 break;
                             default:
+                                // Just signature
                                 addSignatureDisplayParts(signature, allSignatures);
                         }
                         hasAddedSymbolInfo = true;
                     }
                 }
-                else if ((ts.isNameOfFunctionDeclaration(location) && !(symbolFlags & 98304)) ||
-                    (location.kind === 123 && location.parent.kind === 155)) {
+                else if ((ts.isNameOfFunctionDeclaration(location) && !(symbolFlags & 98304 /* Accessor */)) || // name of function declaration
+                    (location.kind === 123 /* ConstructorKeyword */ && location.parent.kind === 155 /* Constructor */)) { // At constructor keyword of constructor declaration
+                    // get the signature from the declaration and write it
                     var functionDeclaration_1 = location.parent;
+                    // Use function declaration to write the signatures only if the symbol corresponding to this declaration
                     var locationIsSymbolDeclaration = ts.find(symbol.declarations, function (declaration) {
-                        return declaration === (location.kind === 123 ? functionDeclaration_1.parent : functionDeclaration_1);
+                        return declaration === (location.kind === 123 /* ConstructorKeyword */ ? functionDeclaration_1.parent : functionDeclaration_1);
                     });
                     if (locationIsSymbolDeclaration) {
-                        var allSignatures = functionDeclaration_1.kind === 155 ? type.getNonNullableType().getConstructSignatures() : type.getNonNullableType().getCallSignatures();
+                        var allSignatures = functionDeclaration_1.kind === 155 /* Constructor */ ? type.getNonNullableType().getConstructSignatures() : type.getNonNullableType().getCallSignatures();
                         if (!typeChecker.isImplementationOfOverload(functionDeclaration_1)) {
-                            signature = typeChecker.getSignatureFromDeclaration(functionDeclaration_1);
+                            signature = typeChecker.getSignatureFromDeclaration(functionDeclaration_1); // TODO: GH#18217
                         }
                         else {
                             signature = allSignatures[0];
                         }
-                        if (functionDeclaration_1.kind === 155) {
-                            symbolKind = "constructor";
+                        if (functionDeclaration_1.kind === 155 /* Constructor */) {
+                            // show (constructor) Type(...) signature
+                            symbolKind = "constructor" /* constructorImplementationElement */;
                             addPrefixForAnyFunctionOrVar(type.symbol, symbolKind);
                         }
                         else {
-                            addPrefixForAnyFunctionOrVar(functionDeclaration_1.kind === 158 &&
-                                !(type.symbol.flags & 2048 || type.symbol.flags & 4096) ? type.symbol : symbol, symbolKind);
+                            // (function/method) symbol(..signature)
+                            addPrefixForAnyFunctionOrVar(functionDeclaration_1.kind === 158 /* CallSignature */ &&
+                                !(type.symbol.flags & 2048 /* TypeLiteral */ || type.symbol.flags & 4096 /* ObjectLiteral */) ? type.symbol : symbol, symbolKind);
                         }
                         addSignatureDisplayParts(signature, allSignatures);
                         hasAddedSymbolInfo = true;
                     }
                 }
             }
-            if (symbolFlags & 32 && !hasAddedSymbolInfo && !isThisExpression) {
+            if (symbolFlags & 32 /* Class */ && !hasAddedSymbolInfo && !isThisExpression) {
                 addAliasPrefixIfNecessary();
-                if (ts.getDeclarationOfKind(symbol, 205)) {
-                    pushSymbolKind("local class");
+                if (ts.getDeclarationOfKind(symbol, 205 /* ClassExpression */)) {
+                    // Special case for class expressions because we would like to indicate that
+                    // the class name is local to the class body (similar to function expression)
+                    //      (local class) class <className>
+                    pushSymbolKind("local class" /* localClassElement */);
                 }
                 else {
-                    displayParts.push(ts.keywordPart(75));
+                    // Class declaration has name which is not local.
+                    displayParts.push(ts.keywordPart(75 /* ClassKeyword */));
                 }
                 displayParts.push(ts.spacePart());
                 addFullSymbolName(symbol);
                 writeTypeParametersOfSymbol(symbol, sourceFile);
             }
-            if ((symbolFlags & 64) && (semanticMeaning & 2)) {
+            if ((symbolFlags & 64 /* Interface */) && (semanticMeaning & 2 /* Type */)) {
                 prefixNextMeaning();
-                displayParts.push(ts.keywordPart(109));
+                displayParts.push(ts.keywordPart(109 /* InterfaceKeyword */));
                 displayParts.push(ts.spacePart());
                 addFullSymbolName(symbol);
                 writeTypeParametersOfSymbol(symbol, sourceFile);
             }
-            if (symbolFlags & 524288) {
+            if (symbolFlags & 524288 /* TypeAlias */) {
                 prefixNextMeaning();
-                displayParts.push(ts.keywordPart(139));
+                displayParts.push(ts.keywordPart(139 /* TypeKeyword */));
                 displayParts.push(ts.spacePart());
                 addFullSymbolName(symbol);
                 writeTypeParametersOfSymbol(symbol, sourceFile);
                 displayParts.push(ts.spacePart());
-                displayParts.push(ts.operatorPart(58));
+                displayParts.push(ts.operatorPart(58 /* EqualsToken */));
                 displayParts.push(ts.spacePart());
-                ts.addRange(displayParts, ts.typeToDisplayParts(typeChecker, typeChecker.getDeclaredTypeOfSymbol(symbol), enclosingDeclaration, 8388608));
+                ts.addRange(displayParts, ts.typeToDisplayParts(typeChecker, typeChecker.getDeclaredTypeOfSymbol(symbol), enclosingDeclaration, 8388608 /* InTypeAlias */));
             }
-            if (symbolFlags & 384) {
+            if (symbolFlags & 384 /* Enum */) {
                 prefixNextMeaning();
                 if (ts.forEach(symbol.declarations, ts.isConstEnumDeclaration)) {
-                    displayParts.push(ts.keywordPart(76));
+                    displayParts.push(ts.keywordPart(76 /* ConstKeyword */));
                     displayParts.push(ts.spacePart());
                 }
-                displayParts.push(ts.keywordPart(83));
+                displayParts.push(ts.keywordPart(83 /* EnumKeyword */));
                 displayParts.push(ts.spacePart());
                 addFullSymbolName(symbol);
             }
-            if (symbolFlags & 1536) {
+            if (symbolFlags & 1536 /* Module */) {
                 prefixNextMeaning();
-                var declaration = ts.getDeclarationOfKind(symbol, 239);
-                var isNamespace = declaration && declaration.name && declaration.name.kind === 71;
-                displayParts.push(ts.keywordPart(isNamespace ? 130 : 129));
+                var declaration = ts.getDeclarationOfKind(symbol, 239 /* ModuleDeclaration */);
+                var isNamespace = declaration && declaration.name && declaration.name.kind === 71 /* Identifier */;
+                displayParts.push(ts.keywordPart(isNamespace ? 130 /* NamespaceKeyword */ : 129 /* ModuleKeyword */));
                 displayParts.push(ts.spacePart());
                 addFullSymbolName(symbol);
             }
-            if ((symbolFlags & 262144) && (semanticMeaning & 2)) {
+            if ((symbolFlags & 262144 /* TypeParameter */) && (semanticMeaning & 2 /* Type */)) {
                 prefixNextMeaning();
-                displayParts.push(ts.punctuationPart(19));
+                displayParts.push(ts.punctuationPart(19 /* OpenParenToken */));
                 displayParts.push(ts.textPart("type parameter"));
-                displayParts.push(ts.punctuationPart(20));
+                displayParts.push(ts.punctuationPart(20 /* CloseParenToken */));
                 displayParts.push(ts.spacePart());
                 addFullSymbolName(symbol);
                 if (symbol.parent) {
+                    // Class/Interface type parameter
                     addInPrefix();
                     addFullSymbolName(symbol.parent, enclosingDeclaration);
                     writeTypeParametersOfSymbol(symbol.parent, enclosingDeclaration);
                 }
                 else {
-                    var decl = ts.getDeclarationOfKind(symbol, 148);
+                    // Method/function type parameter
+                    var decl = ts.getDeclarationOfKind(symbol, 148 /* TypeParameter */);
                     if (decl === undefined)
                         return ts.Debug.fail();
                     var declaration = decl.parent;
                     if (declaration) {
                         if (ts.isFunctionLikeKind(declaration.kind)) {
                             addInPrefix();
-                            var signature = typeChecker.getSignatureFromDeclaration(declaration);
-                            if (declaration.kind === 159) {
-                                displayParts.push(ts.keywordPart(94));
+                            var signature = typeChecker.getSignatureFromDeclaration(declaration); // TODO: GH#18217
+                            if (declaration.kind === 159 /* ConstructSignature */) {
+                                displayParts.push(ts.keywordPart(94 /* NewKeyword */));
                                 displayParts.push(ts.spacePart());
                             }
-                            else if (declaration.kind !== 158 && declaration.name) {
+                            else if (declaration.kind !== 158 /* CallSignature */ && declaration.name) {
                                 addFullSymbolName(declaration.symbol);
                             }
-                            ts.addRange(displayParts, ts.signatureToDisplayParts(typeChecker, signature, sourceFile, 32));
+                            ts.addRange(displayParts, ts.signatureToDisplayParts(typeChecker, signature, sourceFile, 32 /* WriteTypeArgumentsOfSignature */));
                         }
-                        else if (declaration.kind === 237) {
+                        else if (declaration.kind === 237 /* TypeAliasDeclaration */) {
+                            // Type alias type parameter
+                            // For example
+                            //      type list<T> = T[]; // Both T will go through same code path
                             addInPrefix();
-                            displayParts.push(ts.keywordPart(139));
+                            displayParts.push(ts.keywordPart(139 /* TypeKeyword */));
                             displayParts.push(ts.spacePart());
                             addFullSymbolName(declaration.symbol);
                             writeTypeParametersOfSymbol(declaration.symbol, sourceFile);
@@ -80309,21 +97725,21 @@ var ts;
                     }
                 }
             }
-            if (symbolFlags & 8) {
-                symbolKind = "enum member";
+            if (symbolFlags & 8 /* EnumMember */) {
+                symbolKind = "enum member" /* enumMemberElement */;
                 addPrefixForAnyFunctionOrVar(symbol, "enum member");
                 var declaration = symbol.declarations[0];
-                if (declaration.kind === 273) {
+                if (declaration.kind === 273 /* EnumMember */) {
                     var constantValue = typeChecker.getConstantValue(declaration);
                     if (constantValue !== undefined) {
                         displayParts.push(ts.spacePart());
-                        displayParts.push(ts.operatorPart(58));
+                        displayParts.push(ts.operatorPart(58 /* EqualsToken */));
                         displayParts.push(ts.spacePart());
                         displayParts.push(ts.displayPart(ts.getTextOfConstantValue(constantValue), typeof constantValue === "number" ? ts.SymbolDisplayPartKind.numericLiteral : ts.SymbolDisplayPartKind.stringLiteral));
                     }
                 }
             }
-            if (symbolFlags & 2097152) {
+            if (symbolFlags & 2097152 /* Alias */) {
                 prefixNextMeaning();
                 if (!hasAddedSymbolInfo) {
                     var resolvedSymbol = typeChecker.getAliasedSymbol(symbol);
@@ -80332,7 +97748,7 @@ var ts;
                         var declarationName = ts.getNameOfDeclaration(resolvedNode);
                         if (declarationName) {
                             var isExternalModuleDeclaration = ts.isModuleWithStringLiteralName(resolvedNode) &&
-                                ts.hasModifier(resolvedNode, 2);
+                                ts.hasModifier(resolvedNode, 2 /* Ambient */);
                             var shouldUseAliasName = symbol.name !== "default" && !isExternalModuleDeclaration;
                             var resolvedInfo = getSymbolDisplayPartsDocumentationAndSymbolKind(typeChecker, resolvedSymbol, ts.getSourceFileOfNode(resolvedNode), resolvedNode, declarationName, semanticMeaning, shouldUseAliasName ? symbol : resolvedSymbol);
                             displayParts.push.apply(displayParts, resolvedInfo.displayParts);
@@ -80343,41 +97759,41 @@ var ts;
                     }
                 }
                 switch (symbol.declarations[0].kind) {
-                    case 242:
-                        displayParts.push(ts.keywordPart(84));
+                    case 242 /* NamespaceExportDeclaration */:
+                        displayParts.push(ts.keywordPart(84 /* ExportKeyword */));
                         displayParts.push(ts.spacePart());
-                        displayParts.push(ts.keywordPart(130));
+                        displayParts.push(ts.keywordPart(130 /* NamespaceKeyword */));
                         break;
-                    case 249:
-                        displayParts.push(ts.keywordPart(84));
+                    case 249 /* ExportAssignment */:
+                        displayParts.push(ts.keywordPart(84 /* ExportKeyword */));
                         displayParts.push(ts.spacePart());
-                        displayParts.push(ts.keywordPart(symbol.declarations[0].isExportEquals ? 58 : 79));
+                        displayParts.push(ts.keywordPart(symbol.declarations[0].isExportEquals ? 58 /* EqualsToken */ : 79 /* DefaultKeyword */));
                         break;
-                    case 252:
-                        displayParts.push(ts.keywordPart(84));
+                    case 252 /* ExportSpecifier */:
+                        displayParts.push(ts.keywordPart(84 /* ExportKeyword */));
                         break;
                     default:
-                        displayParts.push(ts.keywordPart(91));
+                        displayParts.push(ts.keywordPart(91 /* ImportKeyword */));
                 }
                 displayParts.push(ts.spacePart());
                 addFullSymbolName(symbol);
                 ts.forEach(symbol.declarations, function (declaration) {
-                    if (declaration.kind === 243) {
+                    if (declaration.kind === 243 /* ImportEqualsDeclaration */) {
                         var importEqualsDeclaration = declaration;
                         if (ts.isExternalModuleImportEqualsDeclaration(importEqualsDeclaration)) {
                             displayParts.push(ts.spacePart());
-                            displayParts.push(ts.operatorPart(58));
+                            displayParts.push(ts.operatorPart(58 /* EqualsToken */));
                             displayParts.push(ts.spacePart());
-                            displayParts.push(ts.keywordPart(133));
-                            displayParts.push(ts.punctuationPart(19));
+                            displayParts.push(ts.keywordPart(133 /* RequireKeyword */));
+                            displayParts.push(ts.punctuationPart(19 /* OpenParenToken */));
                             displayParts.push(ts.displayPart(ts.getTextOfNode(ts.getExternalModuleImportEqualsDeclarationExpression(importEqualsDeclaration)), ts.SymbolDisplayPartKind.stringLiteral));
-                            displayParts.push(ts.punctuationPart(20));
+                            displayParts.push(ts.punctuationPart(20 /* CloseParenToken */));
                         }
                         else {
                             var internalAliasSymbol = typeChecker.getSymbolAtLocation(importEqualsDeclaration.moduleReference);
                             if (internalAliasSymbol) {
                                 displayParts.push(ts.spacePart());
-                                displayParts.push(ts.operatorPart(58));
+                                displayParts.push(ts.operatorPart(58 /* EqualsToken */));
                                 displayParts.push(ts.spacePart());
                                 addFullSymbolName(internalAliasSymbol, enclosingDeclaration);
                             }
@@ -80387,26 +97803,28 @@ var ts;
                 });
             }
             if (!hasAddedSymbolInfo) {
-                if (symbolKind !== "") {
+                if (symbolKind !== "" /* unknown */) {
                     if (type) {
                         if (isThisExpression) {
                             prefixNextMeaning();
-                            displayParts.push(ts.keywordPart(99));
+                            displayParts.push(ts.keywordPart(99 /* ThisKeyword */));
                         }
                         else {
                             addPrefixForAnyFunctionOrVar(symbol, symbolKind);
                         }
-                        if (symbolKind === "property" ||
-                            symbolKind === "JSX attribute" ||
-                            symbolFlags & 3 ||
-                            symbolKind === "local var" ||
+                        // For properties, variables and local vars: show the type
+                        if (symbolKind === "property" /* memberVariableElement */ ||
+                            symbolKind === "JSX attribute" /* jsxAttribute */ ||
+                            symbolFlags & 3 /* Variable */ ||
+                            symbolKind === "local var" /* localVariableElement */ ||
                             isThisExpression) {
-                            displayParts.push(ts.punctuationPart(56));
+                            displayParts.push(ts.punctuationPart(56 /* ColonToken */));
                             displayParts.push(ts.spacePart());
-                            if (type.symbol && type.symbol.flags & 262144) {
+                            // If the type is type parameter, format it specially
+                            if (type.symbol && type.symbol.flags & 262144 /* TypeParameter */) {
                                 var typeParameterParts = ts.mapToDisplayParts(function (writer) {
                                     var param = typeChecker.typeParameterToDeclaration(type, enclosingDeclaration);
-                                    getPrinter().writeNode(4, param, ts.getSourceFileOfNode(ts.getParseTreeNode(enclosingDeclaration)), writer);
+                                    getPrinter().writeNode(4 /* Unspecified */, param, ts.getSourceFileOfNode(ts.getParseTreeNode(enclosingDeclaration)), writer);
                                 });
                                 ts.addRange(displayParts, typeParameterParts);
                             }
@@ -80414,12 +97832,12 @@ var ts;
                                 ts.addRange(displayParts, ts.typeToDisplayParts(typeChecker, type, enclosingDeclaration));
                             }
                         }
-                        else if (symbolFlags & 16 ||
-                            symbolFlags & 8192 ||
-                            symbolFlags & 16384 ||
-                            symbolFlags & 131072 ||
-                            symbolFlags & 98304 ||
-                            symbolKind === "method") {
+                        else if (symbolFlags & 16 /* Function */ ||
+                            symbolFlags & 8192 /* Method */ ||
+                            symbolFlags & 16384 /* Constructor */ ||
+                            symbolFlags & 131072 /* Signature */ ||
+                            symbolFlags & 98304 /* Accessor */ ||
+                            symbolKind === "method" /* memberFunctionElement */) {
                             var allSignatures = type.getNonNullableType().getCallSignatures();
                             if (allSignatures.length) {
                                 addSignatureDisplayParts(allSignatures[0], allSignatures);
@@ -80434,11 +97852,14 @@ var ts;
             if (!documentation) {
                 documentation = symbol.getDocumentationComment(typeChecker);
                 tags = symbol.getJsDocTags();
-                if (documentation.length === 0 && symbolFlags & 4) {
-                    if (symbol.parent && ts.forEach(symbol.parent.declarations, function (declaration) { return declaration.kind === 274; })) {
+                if (documentation.length === 0 && symbolFlags & 4 /* Property */) {
+                    // For some special property access expressions like `exports.foo = foo` or `module.exports.foo = foo`
+                    // there documentation comments might be attached to the right hand side symbol of their declarations.
+                    // The pattern of such special property access is that the parent symbol is the symbol of the file.
+                    if (symbol.parent && ts.forEach(symbol.parent.declarations, function (declaration) { return declaration.kind === 274 /* SourceFile */; })) {
                         for (var _i = 0, _a = symbol.declarations; _i < _a.length; _i++) {
                             var declaration = _a[_i];
-                            if (!declaration.parent || declaration.parent.kind !== 200) {
+                            if (!declaration.parent || declaration.parent.kind !== 200 /* BinaryExpression */) {
                                 continue;
                             }
                             var rhsSymbol = typeChecker.getSymbolAtLocation(declaration.parent.right);
@@ -80475,23 +97896,23 @@ var ts;
             }
             function addAliasPrefixIfNecessary() {
                 if (alias) {
-                    pushSymbolKind("alias");
+                    pushSymbolKind("alias" /* alias */);
                     displayParts.push(ts.spacePart());
                 }
             }
             function addInPrefix() {
                 displayParts.push(ts.spacePart());
-                displayParts.push(ts.keywordPart(92));
+                displayParts.push(ts.keywordPart(92 /* InKeyword */));
                 displayParts.push(ts.spacePart());
             }
             function addFullSymbolName(symbolToDisplay, enclosingDeclaration) {
                 if (alias && symbolToDisplay === symbol) {
                     symbolToDisplay = alias;
                 }
-                var fullSymbolDisplayParts = ts.symbolToDisplayParts(typeChecker, symbolToDisplay, enclosingDeclaration || sourceFile, undefined, 1 | 2 | 4);
+                var fullSymbolDisplayParts = ts.symbolToDisplayParts(typeChecker, symbolToDisplay, enclosingDeclaration || sourceFile, /*meaning*/ undefined, 1 /* WriteTypeParametersOrArguments */ | 2 /* UseOnlyExternalAliasing */ | 4 /* AllowAnyNodeKind */);
                 ts.addRange(displayParts, fullSymbolDisplayParts);
-                if (symbol.flags & 16777216) {
-                    displayParts.push(ts.punctuationPart(55));
+                if (symbol.flags & 16777216 /* Optional */) {
+                    displayParts.push(ts.punctuationPart(55 /* QuestionToken */));
                 }
             }
             function addPrefixForAnyFunctionOrVar(symbol, symbolKind) {
@@ -80506,31 +97927,31 @@ var ts;
             }
             function pushSymbolKind(symbolKind) {
                 switch (symbolKind) {
-                    case "var":
-                    case "function":
-                    case "let":
-                    case "const":
-                    case "constructor":
+                    case "var" /* variableElement */:
+                    case "function" /* functionElement */:
+                    case "let" /* letElement */:
+                    case "const" /* constElement */:
+                    case "constructor" /* constructorImplementationElement */:
                         displayParts.push(ts.textOrKeywordPart(symbolKind));
                         return;
                     default:
-                        displayParts.push(ts.punctuationPart(19));
+                        displayParts.push(ts.punctuationPart(19 /* OpenParenToken */));
                         displayParts.push(ts.textOrKeywordPart(symbolKind));
-                        displayParts.push(ts.punctuationPart(20));
+                        displayParts.push(ts.punctuationPart(20 /* CloseParenToken */));
                         return;
                 }
             }
             function addSignatureDisplayParts(signature, allSignatures, flags) {
-                if (flags === void 0) { flags = 0; }
-                ts.addRange(displayParts, ts.signatureToDisplayParts(typeChecker, signature, enclosingDeclaration, flags | 32));
+                if (flags === void 0) { flags = 0 /* None */; }
+                ts.addRange(displayParts, ts.signatureToDisplayParts(typeChecker, signature, enclosingDeclaration, flags | 32 /* WriteTypeArgumentsOfSignature */));
                 if (allSignatures.length > 1) {
                     displayParts.push(ts.spacePart());
-                    displayParts.push(ts.punctuationPart(19));
-                    displayParts.push(ts.operatorPart(37));
+                    displayParts.push(ts.punctuationPart(19 /* OpenParenToken */));
+                    displayParts.push(ts.operatorPart(37 /* PlusToken */));
                     displayParts.push(ts.displayPart((allSignatures.length - 1).toString(), ts.SymbolDisplayPartKind.numericLiteral));
                     displayParts.push(ts.spacePart());
                     displayParts.push(ts.textPart(allSignatures.length === 2 ? "overload" : "overloads"));
-                    displayParts.push(ts.punctuationPart(20));
+                    displayParts.push(ts.punctuationPart(20 /* CloseParenToken */));
                 }
                 documentation = signature.getDocumentationComment(typeChecker);
                 tags = signature.getJsDocTags();
@@ -80538,7 +97959,7 @@ var ts;
             function writeTypeParametersOfSymbol(symbol, enclosingDeclaration) {
                 var typeParameterParts = ts.mapToDisplayParts(function (writer) {
                     var params = typeChecker.symbolToTypeParameterDeclarations(symbol, enclosingDeclaration);
-                    getPrinter().writeList(26896, params, ts.getSourceFileOfNode(ts.getParseTreeNode(enclosingDeclaration)), writer);
+                    getPrinter().writeList(26896 /* TypeParameters */, params, ts.getSourceFileOfNode(ts.getParseTreeNode(enclosingDeclaration)), writer);
                 });
                 ts.addRange(displayParts, typeParameterParts);
             }
@@ -80546,20 +97967,24 @@ var ts;
         SymbolDisplay.getSymbolDisplayPartsDocumentationAndSymbolKind = getSymbolDisplayPartsDocumentationAndSymbolKind;
         function isLocalVariableOrFunction(symbol) {
             if (symbol.parent) {
-                return false;
+                return false; // This is exported symbol
             }
             return ts.forEach(symbol.declarations, function (declaration) {
-                if (declaration.kind === 192) {
+                // Function expressions are local
+                if (declaration.kind === 192 /* FunctionExpression */) {
                     return true;
                 }
-                if (declaration.kind !== 232 && declaration.kind !== 234) {
+                if (declaration.kind !== 232 /* VariableDeclaration */ && declaration.kind !== 234 /* FunctionDeclaration */) {
                     return false;
                 }
+                // If the parent is not sourceFile or module block it is local variable
                 for (var parent = declaration.parent; !ts.isFunctionBlock(parent); parent = parent.parent) {
-                    if (parent.kind === 274 || parent.kind === 240) {
+                    // Reached source file or module block
+                    if (parent.kind === 274 /* SourceFile */ || parent.kind === 240 /* ModuleBlock */) {
                         return false;
                     }
                 }
+                // parent is in function block
                 return true;
             });
         }
@@ -80567,13 +97992,27 @@ var ts;
 })(ts || (ts = {}));
 var ts;
 (function (ts) {
+    /*
+     * This function will compile source text from 'input' argument using specified compiler options.
+     * If not options are provided - it will use a set of default compiler options.
+     * Extra compiler options that will unconditionally be used by this function are:
+     * - isolatedModules = true
+     * - allowNonTsExtensions = true
+     * - noLib = true
+     * - noResolve = true
+     */
     function transpileModule(input, transpileOptions) {
         var diagnostics = [];
         var options = transpileOptions.compilerOptions ? fixupCompilerOptions(transpileOptions.compilerOptions, diagnostics) : ts.getDefaultCompilerOptions();
         options.isolatedModules = true;
+        // transpileModule does not write anything to disk so there is no need to verify that there are no conflicts between input and output paths.
         options.suppressOutputPathCheck = true;
+        // Filename can be non-ts file.
         options.allowNonTsExtensions = true;
+        // We are not returning a sourceFile for lib file when asked by the program,
+        // so pass --noLib to avoid reporting a file not found error.
         options.noLib = true;
+        // Clear out other settings that would not be used in transpiling this module
         options.lib = undefined;
         options.types = undefined;
         options.noEmit = undefined;
@@ -80584,9 +98023,12 @@ var ts;
         options.declarationDir = undefined;
         options.out = undefined;
         options.outFile = undefined;
+        // We are not doing a full typecheck, we are not resolving the whole context,
+        // so pass --noResolve to avoid reporting missing file errors.
         options.noResolve = true;
+        // if jsx is specified then treat file as .tsx
         var inputFileName = transpileOptions.fileName || (options.jsx ? "module.tsx" : "module.ts");
-        var sourceFile = ts.createSourceFile(inputFileName, input, options.target);
+        var sourceFile = ts.createSourceFile(inputFileName, input, options.target); // TODO: GH#18217
         if (transpileOptions.moduleName) {
             sourceFile.moduleName = transpileOptions.moduleName;
         }
@@ -80594,8 +98036,10 @@ var ts;
             sourceFile.renamedDependencies = ts.createMapFromTemplate(transpileOptions.renamedDependencies);
         }
         var newLine = ts.getNewLineCharacter(options);
+        // Output
         var outputText;
         var sourceMapText;
+        // Create a compilerHost object to allow the compiler to read and write files
         var compilerHost = {
             getSourceFile: function (fileName) { return fileName === ts.normalizePath(inputFileName) ? sourceFile : undefined; },
             writeFile: function (name, text) {
@@ -80620,49 +98064,61 @@ var ts;
         };
         var program = ts.createProgram([inputFileName], options, compilerHost);
         if (transpileOptions.reportDiagnostics) {
-            ts.addRange(diagnostics, program.getSyntacticDiagnostics(sourceFile));
-            ts.addRange(diagnostics, program.getOptionsDiagnostics());
+            ts.addRange(/*to*/ diagnostics, /*from*/ program.getSyntacticDiagnostics(sourceFile));
+            ts.addRange(/*to*/ diagnostics, /*from*/ program.getOptionsDiagnostics());
         }
-        program.emit(undefined, undefined, undefined, undefined, transpileOptions.transformers);
+        // Emit
+        program.emit(/*targetSourceFile*/ undefined, /*writeFile*/ undefined, /*cancellationToken*/ undefined, /*emitOnlyDtsFiles*/ undefined, transpileOptions.transformers);
         if (outputText === undefined)
             return ts.Debug.fail("Output generation failed");
         return { outputText: outputText, diagnostics: diagnostics, sourceMapText: sourceMapText };
     }
     ts.transpileModule = transpileModule;
+    /*
+     * This is a shortcut function for transpileModule - it accepts transpileOptions as parameters and returns only outputText part of the result.
+     */
     function transpile(input, compilerOptions, fileName, diagnostics, moduleName) {
         var output = transpileModule(input, { compilerOptions: compilerOptions, fileName: fileName, reportDiagnostics: !!diagnostics, moduleName: moduleName });
+        // addRange correctly handles cases when wither 'from' or 'to' argument is missing
         ts.addRange(diagnostics, output.diagnostics);
         return output.outputText;
     }
     ts.transpile = transpile;
     var commandLineOptionsStringToEnum;
+    /** JS users may pass in string values for enum compiler options (such as ModuleKind), so convert. */
+    /*@internal*/
     function fixupCompilerOptions(options, diagnostics) {
+        // Lazily create this value to fix module loading errors.
         commandLineOptionsStringToEnum = commandLineOptionsStringToEnum || ts.filter(ts.optionDeclarations, function (o) {
             return typeof o.type === "object" && !ts.forEachEntry(o.type, function (v) { return typeof v !== "number"; });
         });
         options = ts.cloneCompilerOptions(options);
-        var _loop_20 = function (opt) {
+        var _loop_9 = function (opt) {
             if (!ts.hasProperty(options, opt.name)) {
                 return "continue";
             }
             var value = options[opt.name];
+            // Value should be a key of opt.type
             if (ts.isString(value)) {
+                // If value is not a string, this will fail
                 options[opt.name] = ts.parseCustomTypeOption(opt, value, diagnostics);
             }
             else {
                 if (!ts.forEachEntry(opt.type, function (v) { return v === value; })) {
+                    // Supplied value isn't a valid enum value.
                     diagnostics.push(ts.createCompilerDiagnosticForInvalidCustomType(opt));
                 }
             }
         };
         for (var _i = 0, commandLineOptionsStringToEnum_1 = commandLineOptionsStringToEnum; _i < commandLineOptionsStringToEnum_1.length; _i++) {
             var opt = commandLineOptionsStringToEnum_1[_i];
-            _loop_20(opt);
+            _loop_9(opt);
         }
         return options;
     }
     ts.fixupCompilerOptions = fixupCompilerOptions;
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var formatting;
@@ -80676,7 +98132,7 @@ var ts;
             FormattingRequestKind[FormattingRequestKind["FormatOnOpeningCurlyBrace"] = 4] = "FormatOnOpeningCurlyBrace";
             FormattingRequestKind[FormattingRequestKind["FormatOnClosingCurlyBrace"] = 5] = "FormatOnClosingCurlyBrace";
         })(FormattingRequestKind = formatting.FormattingRequestKind || (formatting.FormattingRequestKind = {}));
-        var FormattingContext = (function () {
+        var FormattingContext = /** @class */ (function () {
             function FormattingContext(sourceFile, formattingRequestKind, options) {
                 this.sourceFile = sourceFile;
                 this.formattingRequestKind = formattingRequestKind;
@@ -80693,6 +98149,7 @@ var ts;
                 this.nextTokenSpan = nextRange;
                 this.nextTokenParent = nextTokenParent;
                 this.contextNode = commonParent;
+                // drop cached results
                 this.contextNodeAllOnSameLine = undefined;
                 this.nextNodeAllOnSameLine = undefined;
                 this.tokensAreOnSameLine = undefined;
@@ -80737,8 +98194,8 @@ var ts;
                 return startLine === endLine;
             };
             FormattingContext.prototype.BlockIsOnOneLine = function (node) {
-                var openBrace = ts.findChildOfKind(node, 17, this.sourceFile);
-                var closeBrace = ts.findChildOfKind(node, 18, this.sourceFile);
+                var openBrace = ts.findChildOfKind(node, 17 /* OpenBraceToken */, this.sourceFile);
+                var closeBrace = ts.findChildOfKind(node, 18 /* CloseBraceToken */, this.sourceFile);
                 if (openBrace && closeBrace) {
                     var startLine = this.sourceFile.getLineAndCharacterOfPosition(openBrace.getEnd()).line;
                     var endLine = this.sourceFile.getLineAndCharacterOfPosition(closeBrace.getStart(this.sourceFile)).line;
@@ -80751,12 +98208,13 @@ var ts;
         formatting.FormattingContext = FormattingContext;
     })(formatting = ts.formatting || (ts.formatting = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var formatting;
     (function (formatting) {
-        var standardScanner = ts.createScanner(6, false, 0);
-        var jsxScanner = ts.createScanner(6, false, 1);
+        var standardScanner = ts.createScanner(6 /* Latest */, /*skipTrivia*/ false, 0 /* Standard */);
+        var jsxScanner = ts.createScanner(6 /* Latest */, /*skipTrivia*/ false, 1 /* JSX */);
         var ScanAction;
         (function (ScanAction) {
             ScanAction[ScanAction["Scan"] = 0] = "Scan";
@@ -80767,7 +98225,7 @@ var ts;
             ScanAction[ScanAction["RescanJsxText"] = 5] = "RescanJsxText";
         })(ScanAction || (ScanAction = {}));
         function getFormattingScanner(text, languageVariant, startPos, endPos, cb) {
-            var scanner = languageVariant === 1 ? jsxScanner : standardScanner;
+            var scanner = languageVariant === 1 /* JSX */ ? jsxScanner : standardScanner;
             scanner.setText(text);
             scanner.setTextPos(startPos);
             var wasNewLine = true;
@@ -80791,7 +98249,7 @@ var ts;
                 lastTokenInfo = undefined;
                 var isStarted = scanner.getStartPos() !== startPos;
                 if (isStarted) {
-                    wasNewLine = !!trailingTrivia && ts.last(trailingTrivia).kind === 4;
+                    wasNewLine = !!trailingTrivia && ts.last(trailingTrivia).kind === 4 /* NewLineTrivia */;
                 }
                 else {
                     scanner.scan();
@@ -80799,11 +98257,13 @@ var ts;
                 leadingTrivia = undefined;
                 trailingTrivia = undefined;
                 var pos = scanner.getStartPos();
+                // Read leading trivia and token
                 while (pos < endPos) {
                     var t = scanner.getToken();
                     if (!ts.isTrivia(t)) {
                         break;
                     }
+                    // consume leading trivia
                     scanner.scan();
                     var item = {
                         pos: pos,
@@ -80817,11 +98277,11 @@ var ts;
             }
             function shouldRescanGreaterThanToken(node) {
                 switch (node.kind) {
-                    case 31:
-                    case 66:
-                    case 67:
-                    case 47:
-                    case 46:
+                    case 31 /* GreaterThanEqualsToken */:
+                    case 66 /* GreaterThanGreaterThanEqualsToken */:
+                    case 67 /* GreaterThanGreaterThanGreaterThanEqualsToken */:
+                    case 47 /* GreaterThanGreaterThanGreaterThanToken */:
+                    case 46 /* GreaterThanGreaterThanToken */:
                         return true;
                 }
                 return false;
@@ -80829,46 +98289,56 @@ var ts;
             function shouldRescanJsxIdentifier(node) {
                 if (node.parent) {
                     switch (node.parent.kind) {
-                        case 262:
-                        case 257:
-                        case 258:
-                        case 256:
-                            return ts.isKeyword(node.kind) || node.kind === 71;
+                        case 262 /* JsxAttribute */:
+                        case 257 /* JsxOpeningElement */:
+                        case 258 /* JsxClosingElement */:
+                        case 256 /* JsxSelfClosingElement */:
+                            // May parse an identifier like `module-layout`; that will be scanned as a keyword at first, but we should parse the whole thing to get an identifier.
+                            return ts.isKeyword(node.kind) || node.kind === 71 /* Identifier */;
                     }
                 }
                 return false;
             }
             function shouldRescanJsxText(node) {
-                return node.kind === 10;
+                return node.kind === 10 /* JsxText */;
             }
             function shouldRescanSlashToken(container) {
-                return container.kind === 12;
+                return container.kind === 12 /* RegularExpressionLiteral */;
             }
             function shouldRescanTemplateToken(container) {
-                return container.kind === 15 ||
-                    container.kind === 16;
+                return container.kind === 15 /* TemplateMiddle */ ||
+                    container.kind === 16 /* TemplateTail */;
             }
             function startsWithSlashToken(t) {
-                return t === 41 || t === 63;
+                return t === 41 /* SlashToken */ || t === 63 /* SlashEqualsToken */;
             }
             function readTokenInfo(n) {
                 ts.Debug.assert(isOnToken());
+                // normally scanner returns the smallest available token
+                // check the kind of context node to determine if scanner should have more greedy behavior and consume more text.
                 var expectedScanAction = shouldRescanGreaterThanToken(n)
-                    ? 1
+                    ? 1 /* RescanGreaterThanToken */
                     : shouldRescanSlashToken(n)
-                        ? 2
+                        ? 2 /* RescanSlashToken */
                         : shouldRescanTemplateToken(n)
-                            ? 3
+                            ? 3 /* RescanTemplateToken */
                             : shouldRescanJsxIdentifier(n)
-                                ? 4
+                                ? 4 /* RescanJsxIdentifier */
                                 : shouldRescanJsxText(n)
-                                    ? 5
-                                    : 0;
+                                    ? 5 /* RescanJsxText */
+                                    : 0 /* Scan */;
                 if (lastTokenInfo && expectedScanAction === lastScanAction) {
+                    // readTokenInfo was called before with the same expected scan action.
+                    // No need to re-scan text, return existing 'lastTokenInfo'
+                    // it is ok to call fixTokenKind here since it does not affect
+                    // what portion of text is consumed. In contrast rescanning can change it,
+                    // i.e. for '>=' when originally scanner eats just one character
+                    // and rescanning forces it to consume more.
                     return fixTokenKind(lastTokenInfo, n);
                 }
                 if (scanner.getStartPos() !== savedPos) {
                     ts.Debug.assert(lastTokenInfo !== undefined);
+                    // readTokenInfo was called before but scan action differs - rescan text
                     scanner.setTextPos(savedPos);
                     scanner.scan();
                 }
@@ -80878,6 +98348,7 @@ var ts;
                     end: scanner.getTextPos(),
                     kind: currentToken
                 };
+                // consume trailing trivia
                 if (trailingTrivia) {
                     trailingTrivia = undefined;
                 }
@@ -80895,7 +98366,8 @@ var ts;
                         trailingTrivia = [];
                     }
                     trailingTrivia.push(trivia);
-                    if (currentToken === 4) {
+                    if (currentToken === 4 /* NewLineTrivia */) {
+                        // move past new line
                         scanner.scan();
                         break;
                     }
@@ -80905,37 +98377,37 @@ var ts;
             }
             function getNextToken(n, expectedScanAction) {
                 var token = scanner.getToken();
-                lastScanAction = 0;
+                lastScanAction = 0 /* Scan */;
                 switch (expectedScanAction) {
-                    case 1:
-                        if (token === 29) {
-                            lastScanAction = 1;
+                    case 1 /* RescanGreaterThanToken */:
+                        if (token === 29 /* GreaterThanToken */) {
+                            lastScanAction = 1 /* RescanGreaterThanToken */;
                             var newToken = scanner.reScanGreaterToken();
                             ts.Debug.assert(n.kind === newToken);
                             return newToken;
                         }
                         break;
-                    case 2:
+                    case 2 /* RescanSlashToken */:
                         if (startsWithSlashToken(token)) {
-                            lastScanAction = 2;
+                            lastScanAction = 2 /* RescanSlashToken */;
                             var newToken = scanner.reScanSlashToken();
                             ts.Debug.assert(n.kind === newToken);
                             return newToken;
                         }
                         break;
-                    case 3:
-                        if (token === 18) {
-                            lastScanAction = 3;
+                    case 3 /* RescanTemplateToken */:
+                        if (token === 18 /* CloseBraceToken */) {
+                            lastScanAction = 3 /* RescanTemplateToken */;
                             return scanner.reScanTemplateToken();
                         }
                         break;
-                    case 4:
-                        lastScanAction = 4;
+                    case 4 /* RescanJsxIdentifier */:
+                        lastScanAction = 4 /* RescanJsxIdentifier */;
                         return scanner.scanJsxIdentifier();
-                    case 5:
-                        lastScanAction = 5;
+                    case 5 /* RescanJsxText */:
+                        lastScanAction = 5 /* RescanJsxText */;
                         return scanner.reScanJsxToken();
-                    case 0:
+                    case 0 /* Scan */:
                         break;
                     default:
                         ts.Debug.assertNever(expectedScanAction);
@@ -80945,8 +98417,12 @@ var ts;
             function isOnToken() {
                 var current = lastTokenInfo ? lastTokenInfo.token.kind : scanner.getToken();
                 var startPos = lastTokenInfo ? lastTokenInfo.token.pos : scanner.getStartPos();
-                return startPos < endPos && current !== 1 && !ts.isTrivia(current);
+                return startPos < endPos && current !== 1 /* EndOfFileToken */ && !ts.isTrivia(current);
             }
+            // when containing node in the tree is token
+            // but its kind differs from the kind that was returned by the scanner,
+            // then kind needs to be fixed. This might happen in cases
+            // when parser interprets token differently, i.e keyword treated as identifier
             function fixTokenKind(tokenInfo, container) {
                 if (ts.isToken(container) && tokenInfo.token.kind !== container.kind) {
                     tokenInfo.token.kind = container.kind;
@@ -80966,6 +98442,7 @@ var ts;
         formatting.getFormattingScanner = getFormattingScanner;
     })(formatting = ts.formatting || (ts.formatting = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var formatting;
@@ -80985,13 +98462,14 @@ var ts;
         })(RuleFlags = formatting.RuleFlags || (formatting.RuleFlags = {}));
     })(formatting = ts.formatting || (ts.formatting = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var formatting;
     (function (formatting) {
         function getAllRules() {
             var allTokens = [];
-            for (var token = 0; token <= 145; token++) {
+            for (var token = 0 /* FirstToken */; token <= 145 /* LastToken */; token++) {
                 allTokens.push(token);
             }
             function anyTokenExcept() {
@@ -81002,200 +98480,262 @@ var ts;
                 return { tokens: allTokens.filter(function (t) { return !tokens.some(function (t2) { return t2 === t; }); }), isSpecific: false };
             }
             var anyToken = { tokens: allTokens, isSpecific: false };
-            var anyTokenIncludingMultilineComments = tokenRangeFrom(allTokens.concat([3]));
-            var keywords = tokenRangeFromRange(72, 145);
-            var binaryOperators = tokenRangeFromRange(27, 70);
-            var binaryKeywordOperators = [92, 93, 145, 118, 127];
-            var unaryPrefixOperators = [43, 44, 52, 51];
+            var anyTokenIncludingMultilineComments = tokenRangeFrom(allTokens.concat([3 /* MultiLineCommentTrivia */]));
+            var keywords = tokenRangeFromRange(72 /* FirstKeyword */, 145 /* LastKeyword */);
+            var binaryOperators = tokenRangeFromRange(27 /* FirstBinaryOperator */, 70 /* LastBinaryOperator */);
+            var binaryKeywordOperators = [92 /* InKeyword */, 93 /* InstanceOfKeyword */, 145 /* OfKeyword */, 118 /* AsKeyword */, 127 /* IsKeyword */];
+            var unaryPrefixOperators = [43 /* PlusPlusToken */, 44 /* MinusMinusToken */, 52 /* TildeToken */, 51 /* ExclamationToken */];
             var unaryPrefixExpressions = [
-                8, 71, 19, 21,
-                17, 99, 94
+                8 /* NumericLiteral */, 71 /* Identifier */, 19 /* OpenParenToken */, 21 /* OpenBracketToken */,
+                17 /* OpenBraceToken */, 99 /* ThisKeyword */, 94 /* NewKeyword */
             ];
-            var unaryPreincrementExpressions = [71, 19, 99, 94];
-            var unaryPostincrementExpressions = [71, 20, 22, 94];
-            var unaryPredecrementExpressions = [71, 19, 99, 94];
-            var unaryPostdecrementExpressions = [71, 20, 22, 94];
-            var comments = [2, 3];
-            var typeNames = [71].concat(ts.typeKeywords);
+            var unaryPreincrementExpressions = [71 /* Identifier */, 19 /* OpenParenToken */, 99 /* ThisKeyword */, 94 /* NewKeyword */];
+            var unaryPostincrementExpressions = [71 /* Identifier */, 20 /* CloseParenToken */, 22 /* CloseBracketToken */, 94 /* NewKeyword */];
+            var unaryPredecrementExpressions = [71 /* Identifier */, 19 /* OpenParenToken */, 99 /* ThisKeyword */, 94 /* NewKeyword */];
+            var unaryPostdecrementExpressions = [71 /* Identifier */, 20 /* CloseParenToken */, 22 /* CloseBracketToken */, 94 /* NewKeyword */];
+            var comments = [2 /* SingleLineCommentTrivia */, 3 /* MultiLineCommentTrivia */];
+            var typeNames = [71 /* Identifier */].concat(ts.typeKeywords);
+            // Place a space before open brace in a function declaration
+            // TypeScript: Function can have return types, which can be made of tons of different token kinds
             var functionOpenBraceLeftTokenRange = anyTokenIncludingMultilineComments;
-            var typeScriptOpenBraceLeftTokenRange = tokenRangeFrom([71, 3, 75, 84, 91]);
-            var controlOpenBraceLeftTokenRange = tokenRangeFrom([20, 3, 81, 102, 87, 82]);
+            // Place a space before open brace in a TypeScript declaration that has braces as children (class, module, enum, etc)
+            var typeScriptOpenBraceLeftTokenRange = tokenRangeFrom([71 /* Identifier */, 3 /* MultiLineCommentTrivia */, 75 /* ClassKeyword */, 84 /* ExportKeyword */, 91 /* ImportKeyword */]);
+            // Place a space before open brace in a control flow construct
+            var controlOpenBraceLeftTokenRange = tokenRangeFrom([20 /* CloseParenToken */, 3 /* MultiLineCommentTrivia */, 81 /* DoKeyword */, 102 /* TryKeyword */, 87 /* FinallyKeyword */, 82 /* ElseKeyword */]);
+            // These rules are higher in priority than user-configurable
             var highPriorityCommonRules = [
-                rule("IgnoreBeforeComment", anyToken, comments, formatting.anyContext, 1),
-                rule("IgnoreAfterLineComment", 2, anyToken, formatting.anyContext, 1),
-                rule("NotSpaceBeforeColon", anyToken, 56, [isNonJsxSameLineTokenContext, isNotBinaryOpContext, isNotTypeAnnotationContext], 8),
-                rule("SpaceAfterColon", 56, anyToken, [isNonJsxSameLineTokenContext, isNotBinaryOpContext], 2),
-                rule("NoSpaceBeforeQuestionMark", anyToken, 55, [isNonJsxSameLineTokenContext, isNotBinaryOpContext], 8),
-                rule("SpaceAfterQuestionMarkInConditionalOperator", 55, anyToken, [isNonJsxSameLineTokenContext, isConditionalOperatorContext], 2),
-                rule("NoSpaceAfterQuestionMark", 55, anyToken, [isNonJsxSameLineTokenContext], 8),
-                rule("NoSpaceBeforeDot", anyToken, 23, [isNonJsxSameLineTokenContext], 8),
-                rule("NoSpaceAfterDot", 23, anyToken, [isNonJsxSameLineTokenContext], 8),
-                rule("NoSpaceBetweenImportParenInImportType", 91, 19, [isNonJsxSameLineTokenContext, isImportTypeContext], 8),
-                rule("NoSpaceAfterUnaryPrefixOperator", unaryPrefixOperators, unaryPrefixExpressions, [isNonJsxSameLineTokenContext, isNotBinaryOpContext], 8),
-                rule("NoSpaceAfterUnaryPreincrementOperator", 43, unaryPreincrementExpressions, [isNonJsxSameLineTokenContext], 8),
-                rule("NoSpaceAfterUnaryPredecrementOperator", 44, unaryPredecrementExpressions, [isNonJsxSameLineTokenContext], 8),
-                rule("NoSpaceBeforeUnaryPostincrementOperator", unaryPostincrementExpressions, 43, [isNonJsxSameLineTokenContext], 8),
-                rule("NoSpaceBeforeUnaryPostdecrementOperator", unaryPostdecrementExpressions, 44, [isNonJsxSameLineTokenContext], 8),
-                rule("SpaceAfterPostincrementWhenFollowedByAdd", 43, 37, [isNonJsxSameLineTokenContext, isBinaryOpContext], 2),
-                rule("SpaceAfterAddWhenFollowedByUnaryPlus", 37, 37, [isNonJsxSameLineTokenContext, isBinaryOpContext], 2),
-                rule("SpaceAfterAddWhenFollowedByPreincrement", 37, 43, [isNonJsxSameLineTokenContext, isBinaryOpContext], 2),
-                rule("SpaceAfterPostdecrementWhenFollowedBySubtract", 44, 38, [isNonJsxSameLineTokenContext, isBinaryOpContext], 2),
-                rule("SpaceAfterSubtractWhenFollowedByUnaryMinus", 38, 38, [isNonJsxSameLineTokenContext, isBinaryOpContext], 2),
-                rule("SpaceAfterSubtractWhenFollowedByPredecrement", 38, 44, [isNonJsxSameLineTokenContext, isBinaryOpContext], 2),
-                rule("NoSpaceAfterCloseBrace", 18, [26, 25], [isNonJsxSameLineTokenContext], 8),
-                rule("NewLineBeforeCloseBraceInBlockContext", anyTokenIncludingMultilineComments, 18, [isMultilineBlockContext], 4),
-                rule("SpaceAfterCloseBrace", 18, anyTokenExcept(20), [isNonJsxSameLineTokenContext, isAfterCodeBlockContext], 2),
-                rule("SpaceBetweenCloseBraceAndElse", 18, 82, [isNonJsxSameLineTokenContext], 2),
-                rule("SpaceBetweenCloseBraceAndWhile", 18, 106, [isNonJsxSameLineTokenContext], 2),
-                rule("NoSpaceBetweenEmptyBraceBrackets", 17, 18, [isNonJsxSameLineTokenContext, isObjectContext], 8),
-                rule("SpaceAfterConditionalClosingParen", 20, 21, [isControlDeclContext], 2),
-                rule("NoSpaceBetweenFunctionKeywordAndStar", 89, 39, [isFunctionDeclarationOrFunctionExpressionContext], 8),
-                rule("SpaceAfterStarInGeneratorDeclaration", 39, [71, 19], [isFunctionDeclarationOrFunctionExpressionContext], 2),
-                rule("SpaceAfterFunctionInFuncDecl", 89, anyToken, [isFunctionDeclContext], 2),
-                rule("NewLineAfterOpenBraceInBlockContext", 17, anyToken, [isMultilineBlockContext], 4),
-                rule("SpaceAfterGetSetInMember", [125, 136], 71, [isFunctionDeclContext], 2),
-                rule("NoSpaceBetweenYieldKeywordAndStar", 116, 39, [isNonJsxSameLineTokenContext, isYieldOrYieldStarWithOperand], 8),
-                rule("SpaceBetweenYieldOrYieldStarAndOperand", [116, 39], anyToken, [isNonJsxSameLineTokenContext, isYieldOrYieldStarWithOperand], 2),
-                rule("NoSpaceBetweenReturnAndSemicolon", 96, 25, [isNonJsxSameLineTokenContext], 8),
-                rule("SpaceAfterCertainKeywords", [104, 100, 94, 80, 96, 103, 121], anyToken, [isNonJsxSameLineTokenContext], 2),
-                rule("SpaceAfterLetConstInVariableDeclaration", [110, 76], anyToken, [isNonJsxSameLineTokenContext, isStartOfVariableDeclarationList], 2),
-                rule("NoSpaceBeforeOpenParenInFuncCall", anyToken, 19, [isNonJsxSameLineTokenContext, isFunctionCallOrNewContext, isPreviousTokenNotComma], 8),
-                rule("SpaceBeforeBinaryKeywordOperator", anyToken, binaryKeywordOperators, [isNonJsxSameLineTokenContext, isBinaryOpContext], 2),
-                rule("SpaceAfterBinaryKeywordOperator", binaryKeywordOperators, anyToken, [isNonJsxSameLineTokenContext, isBinaryOpContext], 2),
-                rule("SpaceAfterVoidOperator", 105, anyToken, [isNonJsxSameLineTokenContext, isVoidOpContext], 2),
-                rule("SpaceBetweenAsyncAndOpenParen", 120, 19, [isArrowFunctionContext, isNonJsxSameLineTokenContext], 2),
-                rule("SpaceBetweenAsyncAndFunctionKeyword", 120, 89, [isNonJsxSameLineTokenContext], 2),
-                rule("NoSpaceBetweenTagAndTemplateString", [71, 20], [13, 14], [isNonJsxSameLineTokenContext], 8),
-                rule("SpaceBeforeJsxAttribute", anyToken, 71, [isNextTokenParentJsxAttribute, isNonJsxSameLineTokenContext], 2),
-                rule("SpaceBeforeSlashInJsxOpeningElement", anyToken, 41, [isJsxSelfClosingElementContext, isNonJsxSameLineTokenContext], 2),
-                rule("NoSpaceBeforeGreaterThanTokenInJsxOpeningElement", 41, 29, [isJsxSelfClosingElementContext, isNonJsxSameLineTokenContext], 8),
-                rule("NoSpaceBeforeEqualInJsxAttribute", anyToken, 58, [isJsxAttributeContext, isNonJsxSameLineTokenContext], 8),
-                rule("NoSpaceAfterEqualInJsxAttribute", 58, anyToken, [isJsxAttributeContext, isNonJsxSameLineTokenContext], 8),
-                rule("NoSpaceAfterModuleImport", [129, 133], 19, [isNonJsxSameLineTokenContext], 8),
+                // Leave comments alone
+                rule("IgnoreBeforeComment", anyToken, comments, formatting.anyContext, 1 /* Ignore */),
+                rule("IgnoreAfterLineComment", 2 /* SingleLineCommentTrivia */, anyToken, formatting.anyContext, 1 /* Ignore */),
+                rule("NotSpaceBeforeColon", anyToken, 56 /* ColonToken */, [isNonJsxSameLineTokenContext, isNotBinaryOpContext, isNotTypeAnnotationContext], 8 /* Delete */),
+                rule("SpaceAfterColon", 56 /* ColonToken */, anyToken, [isNonJsxSameLineTokenContext, isNotBinaryOpContext], 2 /* Space */),
+                rule("NoSpaceBeforeQuestionMark", anyToken, 55 /* QuestionToken */, [isNonJsxSameLineTokenContext, isNotBinaryOpContext], 8 /* Delete */),
+                // insert space after '?' only when it is used in conditional operator
+                rule("SpaceAfterQuestionMarkInConditionalOperator", 55 /* QuestionToken */, anyToken, [isNonJsxSameLineTokenContext, isConditionalOperatorContext], 2 /* Space */),
+                // in other cases there should be no space between '?' and next token
+                rule("NoSpaceAfterQuestionMark", 55 /* QuestionToken */, anyToken, [isNonJsxSameLineTokenContext], 8 /* Delete */),
+                rule("NoSpaceBeforeDot", anyToken, 23 /* DotToken */, [isNonJsxSameLineTokenContext], 8 /* Delete */),
+                rule("NoSpaceAfterDot", 23 /* DotToken */, anyToken, [isNonJsxSameLineTokenContext], 8 /* Delete */),
+                rule("NoSpaceBetweenImportParenInImportType", 91 /* ImportKeyword */, 19 /* OpenParenToken */, [isNonJsxSameLineTokenContext, isImportTypeContext], 8 /* Delete */),
+                // Special handling of unary operators.
+                // Prefix operators generally shouldn't have a space between
+                // them and their target unary expression.
+                rule("NoSpaceAfterUnaryPrefixOperator", unaryPrefixOperators, unaryPrefixExpressions, [isNonJsxSameLineTokenContext, isNotBinaryOpContext], 8 /* Delete */),
+                rule("NoSpaceAfterUnaryPreincrementOperator", 43 /* PlusPlusToken */, unaryPreincrementExpressions, [isNonJsxSameLineTokenContext], 8 /* Delete */),
+                rule("NoSpaceAfterUnaryPredecrementOperator", 44 /* MinusMinusToken */, unaryPredecrementExpressions, [isNonJsxSameLineTokenContext], 8 /* Delete */),
+                rule("NoSpaceBeforeUnaryPostincrementOperator", unaryPostincrementExpressions, 43 /* PlusPlusToken */, [isNonJsxSameLineTokenContext], 8 /* Delete */),
+                rule("NoSpaceBeforeUnaryPostdecrementOperator", unaryPostdecrementExpressions, 44 /* MinusMinusToken */, [isNonJsxSameLineTokenContext], 8 /* Delete */),
+                // More unary operator special-casing.
+                // DevDiv 181814: Be careful when removing leading whitespace
+                // around unary operators.  Examples:
+                //      1 - -2  --X--> 1--2
+                //      a + ++b --X--> a+++b
+                rule("SpaceAfterPostincrementWhenFollowedByAdd", 43 /* PlusPlusToken */, 37 /* PlusToken */, [isNonJsxSameLineTokenContext, isBinaryOpContext], 2 /* Space */),
+                rule("SpaceAfterAddWhenFollowedByUnaryPlus", 37 /* PlusToken */, 37 /* PlusToken */, [isNonJsxSameLineTokenContext, isBinaryOpContext], 2 /* Space */),
+                rule("SpaceAfterAddWhenFollowedByPreincrement", 37 /* PlusToken */, 43 /* PlusPlusToken */, [isNonJsxSameLineTokenContext, isBinaryOpContext], 2 /* Space */),
+                rule("SpaceAfterPostdecrementWhenFollowedBySubtract", 44 /* MinusMinusToken */, 38 /* MinusToken */, [isNonJsxSameLineTokenContext, isBinaryOpContext], 2 /* Space */),
+                rule("SpaceAfterSubtractWhenFollowedByUnaryMinus", 38 /* MinusToken */, 38 /* MinusToken */, [isNonJsxSameLineTokenContext, isBinaryOpContext], 2 /* Space */),
+                rule("SpaceAfterSubtractWhenFollowedByPredecrement", 38 /* MinusToken */, 44 /* MinusMinusToken */, [isNonJsxSameLineTokenContext, isBinaryOpContext], 2 /* Space */),
+                rule("NoSpaceAfterCloseBrace", 18 /* CloseBraceToken */, [26 /* CommaToken */, 25 /* SemicolonToken */], [isNonJsxSameLineTokenContext], 8 /* Delete */),
+                // For functions and control block place } on a new line [multi-line rule]
+                rule("NewLineBeforeCloseBraceInBlockContext", anyTokenIncludingMultilineComments, 18 /* CloseBraceToken */, [isMultilineBlockContext], 4 /* NewLine */),
+                // Space/new line after }.
+                rule("SpaceAfterCloseBrace", 18 /* CloseBraceToken */, anyTokenExcept(20 /* CloseParenToken */), [isNonJsxSameLineTokenContext, isAfterCodeBlockContext], 2 /* Space */),
+                // Special case for (}, else) and (}, while) since else & while tokens are not part of the tree which makes SpaceAfterCloseBrace rule not applied
+                // Also should not apply to })
+                rule("SpaceBetweenCloseBraceAndElse", 18 /* CloseBraceToken */, 82 /* ElseKeyword */, [isNonJsxSameLineTokenContext], 2 /* Space */),
+                rule("SpaceBetweenCloseBraceAndWhile", 18 /* CloseBraceToken */, 106 /* WhileKeyword */, [isNonJsxSameLineTokenContext], 2 /* Space */),
+                rule("NoSpaceBetweenEmptyBraceBrackets", 17 /* OpenBraceToken */, 18 /* CloseBraceToken */, [isNonJsxSameLineTokenContext, isObjectContext], 8 /* Delete */),
+                // Add a space after control dec context if the next character is an open bracket ex: 'if (false)[a, b] = [1, 2];' -> 'if (false) [a, b] = [1, 2];'
+                rule("SpaceAfterConditionalClosingParen", 20 /* CloseParenToken */, 21 /* OpenBracketToken */, [isControlDeclContext], 2 /* Space */),
+                rule("NoSpaceBetweenFunctionKeywordAndStar", 89 /* FunctionKeyword */, 39 /* AsteriskToken */, [isFunctionDeclarationOrFunctionExpressionContext], 8 /* Delete */),
+                rule("SpaceAfterStarInGeneratorDeclaration", 39 /* AsteriskToken */, [71 /* Identifier */, 19 /* OpenParenToken */], [isFunctionDeclarationOrFunctionExpressionContext], 2 /* Space */),
+                rule("SpaceAfterFunctionInFuncDecl", 89 /* FunctionKeyword */, anyToken, [isFunctionDeclContext], 2 /* Space */),
+                // Insert new line after { and before } in multi-line contexts.
+                rule("NewLineAfterOpenBraceInBlockContext", 17 /* OpenBraceToken */, anyToken, [isMultilineBlockContext], 4 /* NewLine */),
+                // For get/set members, we check for (identifier,identifier) since get/set don't have tokens and they are represented as just an identifier token.
+                // Though, we do extra check on the context to make sure we are dealing with get/set node. Example:
+                //      get x() {}
+                //      set x(val) {}
+                rule("SpaceAfterGetSetInMember", [125 /* GetKeyword */, 136 /* SetKeyword */], 71 /* Identifier */, [isFunctionDeclContext], 2 /* Space */),
+                rule("NoSpaceBetweenYieldKeywordAndStar", 116 /* YieldKeyword */, 39 /* AsteriskToken */, [isNonJsxSameLineTokenContext, isYieldOrYieldStarWithOperand], 8 /* Delete */),
+                rule("SpaceBetweenYieldOrYieldStarAndOperand", [116 /* YieldKeyword */, 39 /* AsteriskToken */], anyToken, [isNonJsxSameLineTokenContext, isYieldOrYieldStarWithOperand], 2 /* Space */),
+                rule("NoSpaceBetweenReturnAndSemicolon", 96 /* ReturnKeyword */, 25 /* SemicolonToken */, [isNonJsxSameLineTokenContext], 8 /* Delete */),
+                rule("SpaceAfterCertainKeywords", [104 /* VarKeyword */, 100 /* ThrowKeyword */, 94 /* NewKeyword */, 80 /* DeleteKeyword */, 96 /* ReturnKeyword */, 103 /* TypeOfKeyword */, 121 /* AwaitKeyword */], anyToken, [isNonJsxSameLineTokenContext], 2 /* Space */),
+                rule("SpaceAfterLetConstInVariableDeclaration", [110 /* LetKeyword */, 76 /* ConstKeyword */], anyToken, [isNonJsxSameLineTokenContext, isStartOfVariableDeclarationList], 2 /* Space */),
+                rule("NoSpaceBeforeOpenParenInFuncCall", anyToken, 19 /* OpenParenToken */, [isNonJsxSameLineTokenContext, isFunctionCallOrNewContext, isPreviousTokenNotComma], 8 /* Delete */),
+                // Special case for binary operators (that are keywords). For these we have to add a space and shouldn't follow any user options.
+                rule("SpaceBeforeBinaryKeywordOperator", anyToken, binaryKeywordOperators, [isNonJsxSameLineTokenContext, isBinaryOpContext], 2 /* Space */),
+                rule("SpaceAfterBinaryKeywordOperator", binaryKeywordOperators, anyToken, [isNonJsxSameLineTokenContext, isBinaryOpContext], 2 /* Space */),
+                rule("SpaceAfterVoidOperator", 105 /* VoidKeyword */, anyToken, [isNonJsxSameLineTokenContext, isVoidOpContext], 2 /* Space */),
+                // Async-await
+                rule("SpaceBetweenAsyncAndOpenParen", 120 /* AsyncKeyword */, 19 /* OpenParenToken */, [isArrowFunctionContext, isNonJsxSameLineTokenContext], 2 /* Space */),
+                rule("SpaceBetweenAsyncAndFunctionKeyword", 120 /* AsyncKeyword */, 89 /* FunctionKeyword */, [isNonJsxSameLineTokenContext], 2 /* Space */),
+                // Template string
+                rule("NoSpaceBetweenTagAndTemplateString", [71 /* Identifier */, 20 /* CloseParenToken */], [13 /* NoSubstitutionTemplateLiteral */, 14 /* TemplateHead */], [isNonJsxSameLineTokenContext], 8 /* Delete */),
+                // JSX opening elements
+                rule("SpaceBeforeJsxAttribute", anyToken, 71 /* Identifier */, [isNextTokenParentJsxAttribute, isNonJsxSameLineTokenContext], 2 /* Space */),
+                rule("SpaceBeforeSlashInJsxOpeningElement", anyToken, 41 /* SlashToken */, [isJsxSelfClosingElementContext, isNonJsxSameLineTokenContext], 2 /* Space */),
+                rule("NoSpaceBeforeGreaterThanTokenInJsxOpeningElement", 41 /* SlashToken */, 29 /* GreaterThanToken */, [isJsxSelfClosingElementContext, isNonJsxSameLineTokenContext], 8 /* Delete */),
+                rule("NoSpaceBeforeEqualInJsxAttribute", anyToken, 58 /* EqualsToken */, [isJsxAttributeContext, isNonJsxSameLineTokenContext], 8 /* Delete */),
+                rule("NoSpaceAfterEqualInJsxAttribute", 58 /* EqualsToken */, anyToken, [isJsxAttributeContext, isNonJsxSameLineTokenContext], 8 /* Delete */),
+                // TypeScript-specific rules
+                // Use of module as a function call. e.g.: import m2 = module("m2");
+                rule("NoSpaceAfterModuleImport", [129 /* ModuleKeyword */, 133 /* RequireKeyword */], 19 /* OpenParenToken */, [isNonJsxSameLineTokenContext], 8 /* Delete */),
+                // Add a space around certain TypeScript keywords
                 rule("SpaceAfterCertainTypeScriptKeywords", [
-                    117,
-                    75,
-                    124,
-                    79,
-                    83,
-                    84,
-                    85,
-                    125,
-                    108,
-                    91,
-                    109,
-                    129,
-                    130,
-                    112,
-                    114,
-                    113,
-                    132,
-                    136,
-                    115,
-                    139,
-                    143,
-                    128,
-                    126,
-                ], anyToken, [isNonJsxSameLineTokenContext], 2),
-                rule("SpaceBeforeCertainTypeScriptKeywords", anyToken, [85, 108, 143], [isNonJsxSameLineTokenContext], 2),
-                rule("SpaceAfterModuleName", 9, 17, [isModuleDeclContext], 2),
-                rule("SpaceBeforeArrow", anyToken, 36, [isNonJsxSameLineTokenContext], 2),
-                rule("SpaceAfterArrow", 36, anyToken, [isNonJsxSameLineTokenContext], 2),
-                rule("NoSpaceAfterEllipsis", 24, 71, [isNonJsxSameLineTokenContext], 8),
-                rule("NoSpaceAfterOptionalParameters", 55, [20, 26], [isNonJsxSameLineTokenContext, isNotBinaryOpContext], 8),
-                rule("NoSpaceBetweenEmptyInterfaceBraceBrackets", 17, 18, [isNonJsxSameLineTokenContext, isObjectTypeContext], 8),
-                rule("NoSpaceBeforeOpenAngularBracket", typeNames, 27, [isNonJsxSameLineTokenContext, isTypeArgumentOrParameterOrAssertionContext], 8),
-                rule("NoSpaceBetweenCloseParenAndAngularBracket", 20, 27, [isNonJsxSameLineTokenContext, isTypeArgumentOrParameterOrAssertionContext], 8),
-                rule("NoSpaceAfterOpenAngularBracket", 27, anyToken, [isNonJsxSameLineTokenContext, isTypeArgumentOrParameterOrAssertionContext], 8),
-                rule("NoSpaceBeforeCloseAngularBracket", anyToken, 29, [isNonJsxSameLineTokenContext, isTypeArgumentOrParameterOrAssertionContext], 8),
-                rule("NoSpaceAfterCloseAngularBracket", 29, [19, 21, 29, 26], [isNonJsxSameLineTokenContext, isTypeArgumentOrParameterOrAssertionContext, isNotFunctionDeclContext], 8),
-                rule("SpaceBeforeAt", [20, 71], 57, [isNonJsxSameLineTokenContext], 2),
-                rule("NoSpaceAfterAt", 57, anyToken, [isNonJsxSameLineTokenContext], 8),
+                    117 /* AbstractKeyword */,
+                    75 /* ClassKeyword */,
+                    124 /* DeclareKeyword */,
+                    79 /* DefaultKeyword */,
+                    83 /* EnumKeyword */,
+                    84 /* ExportKeyword */,
+                    85 /* ExtendsKeyword */,
+                    125 /* GetKeyword */,
+                    108 /* ImplementsKeyword */,
+                    91 /* ImportKeyword */,
+                    109 /* InterfaceKeyword */,
+                    129 /* ModuleKeyword */,
+                    130 /* NamespaceKeyword */,
+                    112 /* PrivateKeyword */,
+                    114 /* PublicKeyword */,
+                    113 /* ProtectedKeyword */,
+                    132 /* ReadonlyKeyword */,
+                    136 /* SetKeyword */,
+                    115 /* StaticKeyword */,
+                    139 /* TypeKeyword */,
+                    143 /* FromKeyword */,
+                    128 /* KeyOfKeyword */,
+                    126 /* InferKeyword */,
+                ], anyToken, [isNonJsxSameLineTokenContext], 2 /* Space */),
+                rule("SpaceBeforeCertainTypeScriptKeywords", anyToken, [85 /* ExtendsKeyword */, 108 /* ImplementsKeyword */, 143 /* FromKeyword */], [isNonJsxSameLineTokenContext], 2 /* Space */),
+                // Treat string literals in module names as identifiers, and add a space between the literal and the opening Brace braces, e.g.: module "m2" {
+                rule("SpaceAfterModuleName", 9 /* StringLiteral */, 17 /* OpenBraceToken */, [isModuleDeclContext], 2 /* Space */),
+                // Lambda expressions
+                rule("SpaceBeforeArrow", anyToken, 36 /* EqualsGreaterThanToken */, [isNonJsxSameLineTokenContext], 2 /* Space */),
+                rule("SpaceAfterArrow", 36 /* EqualsGreaterThanToken */, anyToken, [isNonJsxSameLineTokenContext], 2 /* Space */),
+                // Optional parameters and let args
+                rule("NoSpaceAfterEllipsis", 24 /* DotDotDotToken */, 71 /* Identifier */, [isNonJsxSameLineTokenContext], 8 /* Delete */),
+                rule("NoSpaceAfterOptionalParameters", 55 /* QuestionToken */, [20 /* CloseParenToken */, 26 /* CommaToken */], [isNonJsxSameLineTokenContext, isNotBinaryOpContext], 8 /* Delete */),
+                // Remove spaces in empty interface literals. e.g.: x: {}
+                rule("NoSpaceBetweenEmptyInterfaceBraceBrackets", 17 /* OpenBraceToken */, 18 /* CloseBraceToken */, [isNonJsxSameLineTokenContext, isObjectTypeContext], 8 /* Delete */),
+                // generics and type assertions
+                rule("NoSpaceBeforeOpenAngularBracket", typeNames, 27 /* LessThanToken */, [isNonJsxSameLineTokenContext, isTypeArgumentOrParameterOrAssertionContext], 8 /* Delete */),
+                rule("NoSpaceBetweenCloseParenAndAngularBracket", 20 /* CloseParenToken */, 27 /* LessThanToken */, [isNonJsxSameLineTokenContext, isTypeArgumentOrParameterOrAssertionContext], 8 /* Delete */),
+                rule("NoSpaceAfterOpenAngularBracket", 27 /* LessThanToken */, anyToken, [isNonJsxSameLineTokenContext, isTypeArgumentOrParameterOrAssertionContext], 8 /* Delete */),
+                rule("NoSpaceBeforeCloseAngularBracket", anyToken, 29 /* GreaterThanToken */, [isNonJsxSameLineTokenContext, isTypeArgumentOrParameterOrAssertionContext], 8 /* Delete */),
+                rule("NoSpaceAfterCloseAngularBracket", 29 /* GreaterThanToken */, [19 /* OpenParenToken */, 21 /* OpenBracketToken */, 29 /* GreaterThanToken */, 26 /* CommaToken */], [isNonJsxSameLineTokenContext, isTypeArgumentOrParameterOrAssertionContext, isNotFunctionDeclContext /*To prevent an interference with the SpaceBeforeOpenParenInFuncDecl rule*/], 8 /* Delete */),
+                // decorators
+                rule("SpaceBeforeAt", [20 /* CloseParenToken */, 71 /* Identifier */], 57 /* AtToken */, [isNonJsxSameLineTokenContext], 2 /* Space */),
+                rule("NoSpaceAfterAt", 57 /* AtToken */, anyToken, [isNonJsxSameLineTokenContext], 8 /* Delete */),
+                // Insert space after @ in decorator
                 rule("SpaceAfterDecorator", anyToken, [
-                    117,
-                    71,
-                    84,
-                    79,
-                    75,
-                    115,
-                    114,
-                    112,
-                    113,
-                    125,
-                    136,
-                    21,
-                    39,
-                ], [isEndOfDecoratorContextOnSameLine], 2),
-                rule("NoSpaceBeforeNonNullAssertionOperator", anyToken, 51, [isNonJsxSameLineTokenContext, isNonNullAssertionContext], 8),
-                rule("NoSpaceAfterNewKeywordOnConstructorSignature", 94, 19, [isNonJsxSameLineTokenContext, isConstructorSignatureContext], 8),
+                    117 /* AbstractKeyword */,
+                    71 /* Identifier */,
+                    84 /* ExportKeyword */,
+                    79 /* DefaultKeyword */,
+                    75 /* ClassKeyword */,
+                    115 /* StaticKeyword */,
+                    114 /* PublicKeyword */,
+                    112 /* PrivateKeyword */,
+                    113 /* ProtectedKeyword */,
+                    125 /* GetKeyword */,
+                    136 /* SetKeyword */,
+                    21 /* OpenBracketToken */,
+                    39 /* AsteriskToken */,
+                ], [isEndOfDecoratorContextOnSameLine], 2 /* Space */),
+                rule("NoSpaceBeforeNonNullAssertionOperator", anyToken, 51 /* ExclamationToken */, [isNonJsxSameLineTokenContext, isNonNullAssertionContext], 8 /* Delete */),
+                rule("NoSpaceAfterNewKeywordOnConstructorSignature", 94 /* NewKeyword */, 19 /* OpenParenToken */, [isNonJsxSameLineTokenContext, isConstructorSignatureContext], 8 /* Delete */),
             ];
+            // These rules are applied after high priority
             var userConfigurableRules = [
-                rule("SpaceAfterConstructor", 123, 19, [isOptionEnabled("insertSpaceAfterConstructor"), isNonJsxSameLineTokenContext], 2),
-                rule("NoSpaceAfterConstructor", 123, 19, [isOptionDisabledOrUndefined("insertSpaceAfterConstructor"), isNonJsxSameLineTokenContext], 8),
-                rule("SpaceAfterComma", 26, anyToken, [isOptionEnabled("insertSpaceAfterCommaDelimiter"), isNonJsxSameLineTokenContext, isNonJsxElementOrFragmentContext, isNextTokenNotCloseBracket], 2),
-                rule("NoSpaceAfterComma", 26, anyToken, [isOptionDisabledOrUndefined("insertSpaceAfterCommaDelimiter"), isNonJsxSameLineTokenContext, isNonJsxElementOrFragmentContext], 8),
-                rule("SpaceAfterAnonymousFunctionKeyword", 89, 19, [isOptionEnabled("insertSpaceAfterFunctionKeywordForAnonymousFunctions"), isFunctionDeclContext], 2),
-                rule("NoSpaceAfterAnonymousFunctionKeyword", 89, 19, [isOptionDisabledOrUndefined("insertSpaceAfterFunctionKeywordForAnonymousFunctions"), isFunctionDeclContext], 8),
-                rule("SpaceAfterKeywordInControl", keywords, 19, [isOptionEnabled("insertSpaceAfterKeywordsInControlFlowStatements"), isControlDeclContext], 2),
-                rule("NoSpaceAfterKeywordInControl", keywords, 19, [isOptionDisabledOrUndefined("insertSpaceAfterKeywordsInControlFlowStatements"), isControlDeclContext], 8),
-                rule("SpaceAfterOpenParen", 19, anyToken, [isOptionEnabled("insertSpaceAfterOpeningAndBeforeClosingNonemptyParenthesis"), isNonJsxSameLineTokenContext], 2),
-                rule("SpaceBeforeCloseParen", anyToken, 20, [isOptionEnabled("insertSpaceAfterOpeningAndBeforeClosingNonemptyParenthesis"), isNonJsxSameLineTokenContext], 2),
-                rule("SpaceBetweenOpenParens", 19, 19, [isOptionEnabled("insertSpaceAfterOpeningAndBeforeClosingNonemptyParenthesis"), isNonJsxSameLineTokenContext], 2),
-                rule("NoSpaceBetweenParens", 19, 20, [isNonJsxSameLineTokenContext], 8),
-                rule("NoSpaceAfterOpenParen", 19, anyToken, [isOptionDisabledOrUndefined("insertSpaceAfterOpeningAndBeforeClosingNonemptyParenthesis"), isNonJsxSameLineTokenContext], 8),
-                rule("NoSpaceBeforeCloseParen", anyToken, 20, [isOptionDisabledOrUndefined("insertSpaceAfterOpeningAndBeforeClosingNonemptyParenthesis"), isNonJsxSameLineTokenContext], 8),
-                rule("SpaceAfterOpenBracket", 21, anyToken, [isOptionEnabled("insertSpaceAfterOpeningAndBeforeClosingNonemptyBrackets"), isNonJsxSameLineTokenContext], 2),
-                rule("SpaceBeforeCloseBracket", anyToken, 22, [isOptionEnabled("insertSpaceAfterOpeningAndBeforeClosingNonemptyBrackets"), isNonJsxSameLineTokenContext], 2),
-                rule("NoSpaceBetweenBrackets", 21, 22, [isNonJsxSameLineTokenContext], 8),
-                rule("NoSpaceAfterOpenBracket", 21, anyToken, [isOptionDisabledOrUndefined("insertSpaceAfterOpeningAndBeforeClosingNonemptyBrackets"), isNonJsxSameLineTokenContext], 8),
-                rule("NoSpaceBeforeCloseBracket", anyToken, 22, [isOptionDisabledOrUndefined("insertSpaceAfterOpeningAndBeforeClosingNonemptyBrackets"), isNonJsxSameLineTokenContext], 8),
-                rule("SpaceAfterOpenBrace", 17, anyToken, [isOptionEnabledOrUndefined("insertSpaceAfterOpeningAndBeforeClosingNonemptyBraces"), isBraceWrappedContext], 2),
-                rule("SpaceBeforeCloseBrace", anyToken, 18, [isOptionEnabledOrUndefined("insertSpaceAfterOpeningAndBeforeClosingNonemptyBraces"), isBraceWrappedContext], 2),
-                rule("NoSpaceBetweenEmptyBraceBrackets", 17, 18, [isNonJsxSameLineTokenContext, isObjectContext], 8),
-                rule("NoSpaceAfterOpenBrace", 17, anyToken, [isOptionDisabled("insertSpaceAfterOpeningAndBeforeClosingNonemptyBraces"), isNonJsxSameLineTokenContext], 8),
-                rule("NoSpaceBeforeCloseBrace", anyToken, 18, [isOptionDisabled("insertSpaceAfterOpeningAndBeforeClosingNonemptyBraces"), isNonJsxSameLineTokenContext], 8),
-                rule("SpaceAfterTemplateHeadAndMiddle", [14, 15], anyToken, [isOptionEnabled("insertSpaceAfterOpeningAndBeforeClosingTemplateStringBraces"), isNonJsxSameLineTokenContext], 2),
-                rule("SpaceBeforeTemplateMiddleAndTail", anyToken, [15, 16], [isOptionEnabled("insertSpaceAfterOpeningAndBeforeClosingTemplateStringBraces"), isNonJsxSameLineTokenContext], 2),
-                rule("NoSpaceAfterTemplateHeadAndMiddle", [14, 15], anyToken, [isOptionDisabledOrUndefined("insertSpaceAfterOpeningAndBeforeClosingTemplateStringBraces"), isNonJsxSameLineTokenContext], 8),
-                rule("NoSpaceBeforeTemplateMiddleAndTail", anyToken, [15, 16], [isOptionDisabledOrUndefined("insertSpaceAfterOpeningAndBeforeClosingTemplateStringBraces"), isNonJsxSameLineTokenContext], 8),
-                rule("SpaceAfterOpenBraceInJsxExpression", 17, anyToken, [isOptionEnabled("insertSpaceAfterOpeningAndBeforeClosingJsxExpressionBraces"), isNonJsxSameLineTokenContext, isJsxExpressionContext], 2),
-                rule("SpaceBeforeCloseBraceInJsxExpression", anyToken, 18, [isOptionEnabled("insertSpaceAfterOpeningAndBeforeClosingJsxExpressionBraces"), isNonJsxSameLineTokenContext, isJsxExpressionContext], 2),
-                rule("NoSpaceAfterOpenBraceInJsxExpression", 17, anyToken, [isOptionDisabledOrUndefined("insertSpaceAfterOpeningAndBeforeClosingJsxExpressionBraces"), isNonJsxSameLineTokenContext, isJsxExpressionContext], 8),
-                rule("NoSpaceBeforeCloseBraceInJsxExpression", anyToken, 18, [isOptionDisabledOrUndefined("insertSpaceAfterOpeningAndBeforeClosingJsxExpressionBraces"), isNonJsxSameLineTokenContext, isJsxExpressionContext], 8),
-                rule("SpaceAfterSemicolonInFor", 25, anyToken, [isOptionEnabled("insertSpaceAfterSemicolonInForStatements"), isNonJsxSameLineTokenContext, isForContext], 2),
-                rule("NoSpaceAfterSemicolonInFor", 25, anyToken, [isOptionDisabledOrUndefined("insertSpaceAfterSemicolonInForStatements"), isNonJsxSameLineTokenContext, isForContext], 8),
-                rule("SpaceBeforeBinaryOperator", anyToken, binaryOperators, [isOptionEnabled("insertSpaceBeforeAndAfterBinaryOperators"), isNonJsxSameLineTokenContext, isBinaryOpContext], 2),
-                rule("SpaceAfterBinaryOperator", binaryOperators, anyToken, [isOptionEnabled("insertSpaceBeforeAndAfterBinaryOperators"), isNonJsxSameLineTokenContext, isBinaryOpContext], 2),
-                rule("NoSpaceBeforeBinaryOperator", anyToken, binaryOperators, [isOptionDisabledOrUndefined("insertSpaceBeforeAndAfterBinaryOperators"), isNonJsxSameLineTokenContext, isBinaryOpContext], 8),
-                rule("NoSpaceAfterBinaryOperator", binaryOperators, anyToken, [isOptionDisabledOrUndefined("insertSpaceBeforeAndAfterBinaryOperators"), isNonJsxSameLineTokenContext, isBinaryOpContext], 8),
-                rule("SpaceBeforeOpenParenInFuncDecl", anyToken, 19, [isOptionEnabled("insertSpaceBeforeFunctionParenthesis"), isNonJsxSameLineTokenContext, isFunctionDeclContext], 2),
-                rule("NoSpaceBeforeOpenParenInFuncDecl", anyToken, 19, [isOptionDisabledOrUndefined("insertSpaceBeforeFunctionParenthesis"), isNonJsxSameLineTokenContext, isFunctionDeclContext], 8),
-                rule("NewLineBeforeOpenBraceInControl", controlOpenBraceLeftTokenRange, 17, [isOptionEnabled("placeOpenBraceOnNewLineForControlBlocks"), isControlDeclContext, isBeforeMultilineBlockContext], 4, 1),
-                rule("NewLineBeforeOpenBraceInFunction", functionOpenBraceLeftTokenRange, 17, [isOptionEnabled("placeOpenBraceOnNewLineForFunctions"), isFunctionDeclContext, isBeforeMultilineBlockContext], 4, 1),
-                rule("NewLineBeforeOpenBraceInTypeScriptDeclWithBlock", typeScriptOpenBraceLeftTokenRange, 17, [isOptionEnabled("placeOpenBraceOnNewLineForFunctions"), isTypeScriptDeclWithBlockContext, isBeforeMultilineBlockContext], 4, 1),
-                rule("SpaceAfterTypeAssertion", 29, anyToken, [isOptionEnabled("insertSpaceAfterTypeAssertion"), isNonJsxSameLineTokenContext, isTypeAssertionContext], 2),
-                rule("NoSpaceAfterTypeAssertion", 29, anyToken, [isOptionDisabledOrUndefined("insertSpaceAfterTypeAssertion"), isNonJsxSameLineTokenContext, isTypeAssertionContext], 8),
-                rule("SpaceBeforeTypeAnnotation", anyToken, 56, [isOptionEnabled("insertSpaceBeforeTypeAnnotation"), isNonJsxSameLineTokenContext, isTypeAnnotationContext], 2),
-                rule("NoSpaceBeforeTypeAnnotation", anyToken, 56, [isOptionDisabledOrUndefined("insertSpaceBeforeTypeAnnotation"), isNonJsxSameLineTokenContext, isTypeAnnotationContext], 8),
+                // Treat constructor as an identifier in a function declaration, and remove spaces between constructor and following left parentheses
+                rule("SpaceAfterConstructor", 123 /* ConstructorKeyword */, 19 /* OpenParenToken */, [isOptionEnabled("insertSpaceAfterConstructor"), isNonJsxSameLineTokenContext], 2 /* Space */),
+                rule("NoSpaceAfterConstructor", 123 /* ConstructorKeyword */, 19 /* OpenParenToken */, [isOptionDisabledOrUndefined("insertSpaceAfterConstructor"), isNonJsxSameLineTokenContext], 8 /* Delete */),
+                rule("SpaceAfterComma", 26 /* CommaToken */, anyToken, [isOptionEnabled("insertSpaceAfterCommaDelimiter"), isNonJsxSameLineTokenContext, isNonJsxElementOrFragmentContext, isNextTokenNotCloseBracket], 2 /* Space */),
+                rule("NoSpaceAfterComma", 26 /* CommaToken */, anyToken, [isOptionDisabledOrUndefined("insertSpaceAfterCommaDelimiter"), isNonJsxSameLineTokenContext, isNonJsxElementOrFragmentContext], 8 /* Delete */),
+                // Insert space after function keyword for anonymous functions
+                rule("SpaceAfterAnonymousFunctionKeyword", 89 /* FunctionKeyword */, 19 /* OpenParenToken */, [isOptionEnabled("insertSpaceAfterFunctionKeywordForAnonymousFunctions"), isFunctionDeclContext], 2 /* Space */),
+                rule("NoSpaceAfterAnonymousFunctionKeyword", 89 /* FunctionKeyword */, 19 /* OpenParenToken */, [isOptionDisabledOrUndefined("insertSpaceAfterFunctionKeywordForAnonymousFunctions"), isFunctionDeclContext], 8 /* Delete */),
+                // Insert space after keywords in control flow statements
+                rule("SpaceAfterKeywordInControl", keywords, 19 /* OpenParenToken */, [isOptionEnabled("insertSpaceAfterKeywordsInControlFlowStatements"), isControlDeclContext], 2 /* Space */),
+                rule("NoSpaceAfterKeywordInControl", keywords, 19 /* OpenParenToken */, [isOptionDisabledOrUndefined("insertSpaceAfterKeywordsInControlFlowStatements"), isControlDeclContext], 8 /* Delete */),
+                // Insert space after opening and before closing nonempty parenthesis
+                rule("SpaceAfterOpenParen", 19 /* OpenParenToken */, anyToken, [isOptionEnabled("insertSpaceAfterOpeningAndBeforeClosingNonemptyParenthesis"), isNonJsxSameLineTokenContext], 2 /* Space */),
+                rule("SpaceBeforeCloseParen", anyToken, 20 /* CloseParenToken */, [isOptionEnabled("insertSpaceAfterOpeningAndBeforeClosingNonemptyParenthesis"), isNonJsxSameLineTokenContext], 2 /* Space */),
+                rule("SpaceBetweenOpenParens", 19 /* OpenParenToken */, 19 /* OpenParenToken */, [isOptionEnabled("insertSpaceAfterOpeningAndBeforeClosingNonemptyParenthesis"), isNonJsxSameLineTokenContext], 2 /* Space */),
+                rule("NoSpaceBetweenParens", 19 /* OpenParenToken */, 20 /* CloseParenToken */, [isNonJsxSameLineTokenContext], 8 /* Delete */),
+                rule("NoSpaceAfterOpenParen", 19 /* OpenParenToken */, anyToken, [isOptionDisabledOrUndefined("insertSpaceAfterOpeningAndBeforeClosingNonemptyParenthesis"), isNonJsxSameLineTokenContext], 8 /* Delete */),
+                rule("NoSpaceBeforeCloseParen", anyToken, 20 /* CloseParenToken */, [isOptionDisabledOrUndefined("insertSpaceAfterOpeningAndBeforeClosingNonemptyParenthesis"), isNonJsxSameLineTokenContext], 8 /* Delete */),
+                // Insert space after opening and before closing nonempty brackets
+                rule("SpaceAfterOpenBracket", 21 /* OpenBracketToken */, anyToken, [isOptionEnabled("insertSpaceAfterOpeningAndBeforeClosingNonemptyBrackets"), isNonJsxSameLineTokenContext], 2 /* Space */),
+                rule("SpaceBeforeCloseBracket", anyToken, 22 /* CloseBracketToken */, [isOptionEnabled("insertSpaceAfterOpeningAndBeforeClosingNonemptyBrackets"), isNonJsxSameLineTokenContext], 2 /* Space */),
+                rule("NoSpaceBetweenBrackets", 21 /* OpenBracketToken */, 22 /* CloseBracketToken */, [isNonJsxSameLineTokenContext], 8 /* Delete */),
+                rule("NoSpaceAfterOpenBracket", 21 /* OpenBracketToken */, anyToken, [isOptionDisabledOrUndefined("insertSpaceAfterOpeningAndBeforeClosingNonemptyBrackets"), isNonJsxSameLineTokenContext], 8 /* Delete */),
+                rule("NoSpaceBeforeCloseBracket", anyToken, 22 /* CloseBracketToken */, [isOptionDisabledOrUndefined("insertSpaceAfterOpeningAndBeforeClosingNonemptyBrackets"), isNonJsxSameLineTokenContext], 8 /* Delete */),
+                // Insert a space after { and before } in single-line contexts, but remove space from empty object literals {}.
+                rule("SpaceAfterOpenBrace", 17 /* OpenBraceToken */, anyToken, [isOptionEnabledOrUndefined("insertSpaceAfterOpeningAndBeforeClosingNonemptyBraces"), isBraceWrappedContext], 2 /* Space */),
+                rule("SpaceBeforeCloseBrace", anyToken, 18 /* CloseBraceToken */, [isOptionEnabledOrUndefined("insertSpaceAfterOpeningAndBeforeClosingNonemptyBraces"), isBraceWrappedContext], 2 /* Space */),
+                rule("NoSpaceBetweenEmptyBraceBrackets", 17 /* OpenBraceToken */, 18 /* CloseBraceToken */, [isNonJsxSameLineTokenContext, isObjectContext], 8 /* Delete */),
+                rule("NoSpaceAfterOpenBrace", 17 /* OpenBraceToken */, anyToken, [isOptionDisabled("insertSpaceAfterOpeningAndBeforeClosingNonemptyBraces"), isNonJsxSameLineTokenContext], 8 /* Delete */),
+                rule("NoSpaceBeforeCloseBrace", anyToken, 18 /* CloseBraceToken */, [isOptionDisabled("insertSpaceAfterOpeningAndBeforeClosingNonemptyBraces"), isNonJsxSameLineTokenContext], 8 /* Delete */),
+                // Insert space after opening and before closing template string braces
+                rule("SpaceAfterTemplateHeadAndMiddle", [14 /* TemplateHead */, 15 /* TemplateMiddle */], anyToken, [isOptionEnabled("insertSpaceAfterOpeningAndBeforeClosingTemplateStringBraces"), isNonJsxSameLineTokenContext], 2 /* Space */),
+                rule("SpaceBeforeTemplateMiddleAndTail", anyToken, [15 /* TemplateMiddle */, 16 /* TemplateTail */], [isOptionEnabled("insertSpaceAfterOpeningAndBeforeClosingTemplateStringBraces"), isNonJsxSameLineTokenContext], 2 /* Space */),
+                rule("NoSpaceAfterTemplateHeadAndMiddle", [14 /* TemplateHead */, 15 /* TemplateMiddle */], anyToken, [isOptionDisabledOrUndefined("insertSpaceAfterOpeningAndBeforeClosingTemplateStringBraces"), isNonJsxSameLineTokenContext], 8 /* Delete */),
+                rule("NoSpaceBeforeTemplateMiddleAndTail", anyToken, [15 /* TemplateMiddle */, 16 /* TemplateTail */], [isOptionDisabledOrUndefined("insertSpaceAfterOpeningAndBeforeClosingTemplateStringBraces"), isNonJsxSameLineTokenContext], 8 /* Delete */),
+                // No space after { and before } in JSX expression
+                rule("SpaceAfterOpenBraceInJsxExpression", 17 /* OpenBraceToken */, anyToken, [isOptionEnabled("insertSpaceAfterOpeningAndBeforeClosingJsxExpressionBraces"), isNonJsxSameLineTokenContext, isJsxExpressionContext], 2 /* Space */),
+                rule("SpaceBeforeCloseBraceInJsxExpression", anyToken, 18 /* CloseBraceToken */, [isOptionEnabled("insertSpaceAfterOpeningAndBeforeClosingJsxExpressionBraces"), isNonJsxSameLineTokenContext, isJsxExpressionContext], 2 /* Space */),
+                rule("NoSpaceAfterOpenBraceInJsxExpression", 17 /* OpenBraceToken */, anyToken, [isOptionDisabledOrUndefined("insertSpaceAfterOpeningAndBeforeClosingJsxExpressionBraces"), isNonJsxSameLineTokenContext, isJsxExpressionContext], 8 /* Delete */),
+                rule("NoSpaceBeforeCloseBraceInJsxExpression", anyToken, 18 /* CloseBraceToken */, [isOptionDisabledOrUndefined("insertSpaceAfterOpeningAndBeforeClosingJsxExpressionBraces"), isNonJsxSameLineTokenContext, isJsxExpressionContext], 8 /* Delete */),
+                // Insert space after semicolon in for statement
+                rule("SpaceAfterSemicolonInFor", 25 /* SemicolonToken */, anyToken, [isOptionEnabled("insertSpaceAfterSemicolonInForStatements"), isNonJsxSameLineTokenContext, isForContext], 2 /* Space */),
+                rule("NoSpaceAfterSemicolonInFor", 25 /* SemicolonToken */, anyToken, [isOptionDisabledOrUndefined("insertSpaceAfterSemicolonInForStatements"), isNonJsxSameLineTokenContext, isForContext], 8 /* Delete */),
+                // Insert space before and after binary operators
+                rule("SpaceBeforeBinaryOperator", anyToken, binaryOperators, [isOptionEnabled("insertSpaceBeforeAndAfterBinaryOperators"), isNonJsxSameLineTokenContext, isBinaryOpContext], 2 /* Space */),
+                rule("SpaceAfterBinaryOperator", binaryOperators, anyToken, [isOptionEnabled("insertSpaceBeforeAndAfterBinaryOperators"), isNonJsxSameLineTokenContext, isBinaryOpContext], 2 /* Space */),
+                rule("NoSpaceBeforeBinaryOperator", anyToken, binaryOperators, [isOptionDisabledOrUndefined("insertSpaceBeforeAndAfterBinaryOperators"), isNonJsxSameLineTokenContext, isBinaryOpContext], 8 /* Delete */),
+                rule("NoSpaceAfterBinaryOperator", binaryOperators, anyToken, [isOptionDisabledOrUndefined("insertSpaceBeforeAndAfterBinaryOperators"), isNonJsxSameLineTokenContext, isBinaryOpContext], 8 /* Delete */),
+                rule("SpaceBeforeOpenParenInFuncDecl", anyToken, 19 /* OpenParenToken */, [isOptionEnabled("insertSpaceBeforeFunctionParenthesis"), isNonJsxSameLineTokenContext, isFunctionDeclContext], 2 /* Space */),
+                rule("NoSpaceBeforeOpenParenInFuncDecl", anyToken, 19 /* OpenParenToken */, [isOptionDisabledOrUndefined("insertSpaceBeforeFunctionParenthesis"), isNonJsxSameLineTokenContext, isFunctionDeclContext], 8 /* Delete */),
+                // Open Brace braces after control block
+                rule("NewLineBeforeOpenBraceInControl", controlOpenBraceLeftTokenRange, 17 /* OpenBraceToken */, [isOptionEnabled("placeOpenBraceOnNewLineForControlBlocks"), isControlDeclContext, isBeforeMultilineBlockContext], 4 /* NewLine */, 1 /* CanDeleteNewLines */),
+                // Open Brace braces after function
+                // TypeScript: Function can have return types, which can be made of tons of different token kinds
+                rule("NewLineBeforeOpenBraceInFunction", functionOpenBraceLeftTokenRange, 17 /* OpenBraceToken */, [isOptionEnabled("placeOpenBraceOnNewLineForFunctions"), isFunctionDeclContext, isBeforeMultilineBlockContext], 4 /* NewLine */, 1 /* CanDeleteNewLines */),
+                // Open Brace braces after TypeScript module/class/interface
+                rule("NewLineBeforeOpenBraceInTypeScriptDeclWithBlock", typeScriptOpenBraceLeftTokenRange, 17 /* OpenBraceToken */, [isOptionEnabled("placeOpenBraceOnNewLineForFunctions"), isTypeScriptDeclWithBlockContext, isBeforeMultilineBlockContext], 4 /* NewLine */, 1 /* CanDeleteNewLines */),
+                rule("SpaceAfterTypeAssertion", 29 /* GreaterThanToken */, anyToken, [isOptionEnabled("insertSpaceAfterTypeAssertion"), isNonJsxSameLineTokenContext, isTypeAssertionContext], 2 /* Space */),
+                rule("NoSpaceAfterTypeAssertion", 29 /* GreaterThanToken */, anyToken, [isOptionDisabledOrUndefined("insertSpaceAfterTypeAssertion"), isNonJsxSameLineTokenContext, isTypeAssertionContext], 8 /* Delete */),
+                rule("SpaceBeforeTypeAnnotation", anyToken, 56 /* ColonToken */, [isOptionEnabled("insertSpaceBeforeTypeAnnotation"), isNonJsxSameLineTokenContext, isTypeAnnotationContext], 2 /* Space */),
+                rule("NoSpaceBeforeTypeAnnotation", anyToken, 56 /* ColonToken */, [isOptionDisabledOrUndefined("insertSpaceBeforeTypeAnnotation"), isNonJsxSameLineTokenContext, isTypeAnnotationContext], 8 /* Delete */),
             ];
+            // These rules are lower in priority than user-configurable. Rules earlier in this list have priority over rules later in the list.
             var lowPriorityCommonRules = [
-                rule("NoSpaceBeforeSemicolon", anyToken, 25, [isNonJsxSameLineTokenContext], 8),
-                rule("SpaceBeforeOpenBraceInControl", controlOpenBraceLeftTokenRange, 17, [isOptionDisabledOrUndefinedOrTokensOnSameLine("placeOpenBraceOnNewLineForControlBlocks"), isControlDeclContext, isNotFormatOnEnter, isSameLineTokenOrBeforeBlockContext], 2, 1),
-                rule("SpaceBeforeOpenBraceInFunction", functionOpenBraceLeftTokenRange, 17, [isOptionDisabledOrUndefinedOrTokensOnSameLine("placeOpenBraceOnNewLineForFunctions"), isFunctionDeclContext, isBeforeBlockContext, isNotFormatOnEnter, isSameLineTokenOrBeforeBlockContext], 2, 1),
-                rule("SpaceBeforeOpenBraceInTypeScriptDeclWithBlock", typeScriptOpenBraceLeftTokenRange, 17, [isOptionDisabledOrUndefinedOrTokensOnSameLine("placeOpenBraceOnNewLineForFunctions"), isTypeScriptDeclWithBlockContext, isNotFormatOnEnter, isSameLineTokenOrBeforeBlockContext], 2, 1),
-                rule("NoSpaceBeforeComma", anyToken, 26, [isNonJsxSameLineTokenContext], 8),
-                rule("NoSpaceBeforeOpenBracket", anyTokenExcept(120, 73), 21, [isNonJsxSameLineTokenContext], 8),
-                rule("NoSpaceAfterCloseBracket", 22, anyToken, [isNonJsxSameLineTokenContext, isNotBeforeBlockInFunctionDeclarationContext], 8),
-                rule("SpaceAfterSemicolon", 25, anyToken, [isNonJsxSameLineTokenContext], 2),
-                rule("SpaceBetweenForAndAwaitKeyword", 88, 121, [isNonJsxSameLineTokenContext], 2),
-                rule("SpaceBetweenStatements", [20, 81, 82, 73], anyToken, [isNonJsxSameLineTokenContext, isNonJsxElementOrFragmentContext, isNotForContext], 2),
-                rule("SpaceAfterTryFinally", [102, 87], 17, [isNonJsxSameLineTokenContext], 2),
+                // Space after keyword but not before ; or : or ?
+                rule("NoSpaceBeforeSemicolon", anyToken, 25 /* SemicolonToken */, [isNonJsxSameLineTokenContext], 8 /* Delete */),
+                rule("SpaceBeforeOpenBraceInControl", controlOpenBraceLeftTokenRange, 17 /* OpenBraceToken */, [isOptionDisabledOrUndefinedOrTokensOnSameLine("placeOpenBraceOnNewLineForControlBlocks"), isControlDeclContext, isNotFormatOnEnter, isSameLineTokenOrBeforeBlockContext], 2 /* Space */, 1 /* CanDeleteNewLines */),
+                rule("SpaceBeforeOpenBraceInFunction", functionOpenBraceLeftTokenRange, 17 /* OpenBraceToken */, [isOptionDisabledOrUndefinedOrTokensOnSameLine("placeOpenBraceOnNewLineForFunctions"), isFunctionDeclContext, isBeforeBlockContext, isNotFormatOnEnter, isSameLineTokenOrBeforeBlockContext], 2 /* Space */, 1 /* CanDeleteNewLines */),
+                rule("SpaceBeforeOpenBraceInTypeScriptDeclWithBlock", typeScriptOpenBraceLeftTokenRange, 17 /* OpenBraceToken */, [isOptionDisabledOrUndefinedOrTokensOnSameLine("placeOpenBraceOnNewLineForFunctions"), isTypeScriptDeclWithBlockContext, isNotFormatOnEnter, isSameLineTokenOrBeforeBlockContext], 2 /* Space */, 1 /* CanDeleteNewLines */),
+                rule("NoSpaceBeforeComma", anyToken, 26 /* CommaToken */, [isNonJsxSameLineTokenContext], 8 /* Delete */),
+                // No space before and after indexer `x[]`
+                rule("NoSpaceBeforeOpenBracket", anyTokenExcept(120 /* AsyncKeyword */, 73 /* CaseKeyword */), 21 /* OpenBracketToken */, [isNonJsxSameLineTokenContext], 8 /* Delete */),
+                rule("NoSpaceAfterCloseBracket", 22 /* CloseBracketToken */, anyToken, [isNonJsxSameLineTokenContext, isNotBeforeBlockInFunctionDeclarationContext], 8 /* Delete */),
+                rule("SpaceAfterSemicolon", 25 /* SemicolonToken */, anyToken, [isNonJsxSameLineTokenContext], 2 /* Space */),
+                // Remove extra space between for and await
+                rule("SpaceBetweenForAndAwaitKeyword", 88 /* ForKeyword */, 121 /* AwaitKeyword */, [isNonJsxSameLineTokenContext], 2 /* Space */),
+                // Add a space between statements. All keywords except (do,else,case) has open/close parens after them.
+                // So, we have a rule to add a space for [),Any], [do,Any], [else,Any], and [case,Any]
+                rule("SpaceBetweenStatements", [20 /* CloseParenToken */, 81 /* DoKeyword */, 82 /* ElseKeyword */, 73 /* CaseKeyword */], anyToken, [isNonJsxSameLineTokenContext, isNonJsxElementOrFragmentContext, isNotForContext], 2 /* Space */),
+                // This low-pri rule takes care of "try {" and "finally {" in case the rule SpaceBeforeOpenBraceInControl didn't execute on FormatOnEnter.
+                rule("SpaceAfterTryFinally", [102 /* TryKeyword */, 87 /* FinallyKeyword */], 17 /* OpenBraceToken */, [isNonJsxSameLineTokenContext], 2 /* Space */),
             ];
             return highPriorityCommonRules.concat(userConfigurableRules, lowPriorityCommonRules);
         }
         formatting.getAllRules = getAllRules;
         function rule(debugName, left, right, context, action, flags) {
-            if (flags === void 0) { flags = 0; }
+            if (flags === void 0) { flags = 0 /* None */; }
             return { leftTokenRange: toTokenRange(left), rightTokenRange: toTokenRange(right), rule: { debugName: debugName, context: context, action: action, flags: flags } };
         }
         function tokenRangeFrom(tokens) {
@@ -81214,6 +98754,9 @@ var ts;
             }
             return tokenRangeFrom(tokens);
         }
+        ///
+        /// Contexts
+        ///
         function isOptionEnabled(optionName) {
             return function (context) { return context.options && context.options.hasOwnProperty(optionName) && !!context.options[optionName]; };
         }
@@ -81230,37 +98773,45 @@ var ts;
             return function (context) { return !context.options || !context.options.hasOwnProperty(optionName) || !!context.options[optionName]; };
         }
         function isForContext(context) {
-            return context.contextNode.kind === 220;
+            return context.contextNode.kind === 220 /* ForStatement */;
         }
         function isNotForContext(context) {
             return !isForContext(context);
         }
         function isBinaryOpContext(context) {
             switch (context.contextNode.kind) {
-                case 200:
-                case 201:
-                case 171:
-                case 208:
-                case 252:
-                case 248:
-                case 161:
-                case 169:
-                case 170:
+                case 200 /* BinaryExpression */:
+                case 201 /* ConditionalExpression */:
+                case 171 /* ConditionalType */:
+                case 208 /* AsExpression */:
+                case 252 /* ExportSpecifier */:
+                case 248 /* ImportSpecifier */:
+                case 161 /* TypePredicate */:
+                case 169 /* UnionType */:
+                case 170 /* IntersectionType */:
                     return true;
-                case 182:
-                case 237:
-                case 243:
-                case 232:
-                case 149:
-                case 273:
-                case 152:
-                case 151:
-                    return context.currentTokenSpan.kind === 58 || context.nextTokenSpan.kind === 58;
-                case 221:
-                case 148:
-                    return context.currentTokenSpan.kind === 92 || context.nextTokenSpan.kind === 92;
-                case 222:
-                    return context.currentTokenSpan.kind === 145 || context.nextTokenSpan.kind === 145;
+                // equals in binding elements: function foo([[x, y] = [1, 2]])
+                case 182 /* BindingElement */:
+                // equals in type X = ...
+                case 237 /* TypeAliasDeclaration */:
+                // equal in import a = module('a');
+                case 243 /* ImportEqualsDeclaration */:
+                // equal in let a = 0;
+                case 232 /* VariableDeclaration */:
+                // equal in p = 0;
+                case 149 /* Parameter */:
+                case 273 /* EnumMember */:
+                case 152 /* PropertyDeclaration */:
+                case 151 /* PropertySignature */:
+                    return context.currentTokenSpan.kind === 58 /* EqualsToken */ || context.nextTokenSpan.kind === 58 /* EqualsToken */;
+                // "in" keyword in for (let x in []) { }
+                case 221 /* ForInStatement */:
+                // "in" keyword in [P in keyof T]: T[P]
+                case 148 /* TypeParameter */:
+                    return context.currentTokenSpan.kind === 92 /* InKeyword */ || context.nextTokenSpan.kind === 92 /* InKeyword */;
+                // Technically, "of" is not a binary operator, but format it the same way as "in"
+                case 222 /* ForOfStatement */:
+                    return context.currentTokenSpan.kind === 145 /* OfKeyword */ || context.nextTokenSpan.kind === 145 /* OfKeyword */;
             }
             return false;
         }
@@ -81272,24 +98823,25 @@ var ts;
         }
         function isTypeAnnotationContext(context) {
             var contextKind = context.contextNode.kind;
-            return contextKind === 152 ||
-                contextKind === 151 ||
-                contextKind === 149 ||
-                contextKind === 232 ||
+            return contextKind === 152 /* PropertyDeclaration */ ||
+                contextKind === 151 /* PropertySignature */ ||
+                contextKind === 149 /* Parameter */ ||
+                contextKind === 232 /* VariableDeclaration */ ||
                 ts.isFunctionLikeKind(contextKind);
         }
         function isConditionalOperatorContext(context) {
-            return context.contextNode.kind === 201 ||
-                context.contextNode.kind === 171;
+            return context.contextNode.kind === 201 /* ConditionalExpression */ ||
+                context.contextNode.kind === 171 /* ConditionalType */;
         }
         function isSameLineTokenOrBeforeBlockContext(context) {
             return context.TokensAreOnSameLine() || isBeforeBlockContext(context);
         }
         function isBraceWrappedContext(context) {
-            return context.contextNode.kind === 180 ||
-                context.contextNode.kind === 177 ||
+            return context.contextNode.kind === 180 /* ObjectBindingPattern */ ||
+                context.contextNode.kind === 177 /* MappedType */ ||
                 isSingleLineBlockContext(context);
         }
+        // This check is done before an open brace in a control construct, a function, or a typescript block declaration
         function isBeforeMultilineBlockContext(context) {
             return isBeforeBlockContext(context) && !(context.NextNodeAllOnSameLine() || context.NextNodeBlockIsOnOneLine());
         }
@@ -81305,31 +98857,38 @@ var ts;
         function isBeforeBlockContext(context) {
             return nodeIsBlockContext(context.nextTokenParent);
         }
+        // IMPORTANT!!! This method must return true ONLY for nodes with open and close braces as immediate children
         function nodeIsBlockContext(node) {
             if (nodeIsTypeScriptDeclWithBlockContext(node)) {
+                // This means we are in a context that looks like a block to the user, but in the grammar is actually not a node (it's a class, module, enum, object type literal, etc).
                 return true;
             }
             switch (node.kind) {
-                case 213:
-                case 241:
-                case 184:
-                case 240:
+                case 213 /* Block */:
+                case 241 /* CaseBlock */:
+                case 184 /* ObjectLiteralExpression */:
+                case 240 /* ModuleBlock */:
                     return true;
             }
             return false;
         }
         function isFunctionDeclContext(context) {
             switch (context.contextNode.kind) {
-                case 234:
-                case 154:
-                case 153:
-                case 156:
-                case 157:
-                case 158:
-                case 192:
-                case 155:
-                case 193:
-                case 236:
+                case 234 /* FunctionDeclaration */:
+                case 154 /* MethodDeclaration */:
+                case 153 /* MethodSignature */:
+                // case SyntaxKind.MemberFunctionDeclaration:
+                case 156 /* GetAccessor */:
+                case 157 /* SetAccessor */:
+                // case SyntaxKind.MethodSignature:
+                case 158 /* CallSignature */:
+                case 192 /* FunctionExpression */:
+                case 155 /* Constructor */:
+                case 193 /* ArrowFunction */:
+                // case SyntaxKind.ConstructorDeclaration:
+                // case SyntaxKind.SimpleArrowFunctionExpression:
+                // case SyntaxKind.ParenthesizedArrowFunctionExpression:
+                case 236 /* InterfaceDeclaration */: // This one is not truly a function, but for formatting purposes, it acts just like one
                     return true;
             }
             return false;
@@ -81338,39 +98897,40 @@ var ts;
             return !isFunctionDeclContext(context);
         }
         function isFunctionDeclarationOrFunctionExpressionContext(context) {
-            return context.contextNode.kind === 234 || context.contextNode.kind === 192;
+            return context.contextNode.kind === 234 /* FunctionDeclaration */ || context.contextNode.kind === 192 /* FunctionExpression */;
         }
         function isTypeScriptDeclWithBlockContext(context) {
             return nodeIsTypeScriptDeclWithBlockContext(context.contextNode);
         }
         function nodeIsTypeScriptDeclWithBlockContext(node) {
             switch (node.kind) {
-                case 235:
-                case 205:
-                case 236:
-                case 238:
-                case 166:
-                case 239:
-                case 250:
-                case 251:
-                case 244:
-                case 247:
+                case 235 /* ClassDeclaration */:
+                case 205 /* ClassExpression */:
+                case 236 /* InterfaceDeclaration */:
+                case 238 /* EnumDeclaration */:
+                case 166 /* TypeLiteral */:
+                case 239 /* ModuleDeclaration */:
+                case 250 /* ExportDeclaration */:
+                case 251 /* NamedExports */:
+                case 244 /* ImportDeclaration */:
+                case 247 /* NamedImports */:
                     return true;
             }
             return false;
         }
         function isAfterCodeBlockContext(context) {
             switch (context.currentTokenParent.kind) {
-                case 235:
-                case 239:
-                case 238:
-                case 269:
-                case 240:
-                case 227:
+                case 235 /* ClassDeclaration */:
+                case 239 /* ModuleDeclaration */:
+                case 238 /* EnumDeclaration */:
+                case 269 /* CatchClause */:
+                case 240 /* ModuleBlock */:
+                case 227 /* SwitchStatement */:
                     return true;
-                case 213: {
+                case 213 /* Block */: {
                     var blockParent = context.currentTokenParent.parent;
-                    if (!blockParent || blockParent.kind !== 193 && blockParent.kind !== 192) {
+                    // In a codefix scenario, we can't rely on parents being set. So just always return true.
+                    if (!blockParent || blockParent.kind !== 193 /* ArrowFunction */ && blockParent.kind !== 192 /* FunctionExpression */) {
                         return true;
                     }
                 }
@@ -81379,62 +98939,64 @@ var ts;
         }
         function isControlDeclContext(context) {
             switch (context.contextNode.kind) {
-                case 217:
-                case 227:
-                case 220:
-                case 221:
-                case 222:
-                case 219:
-                case 230:
-                case 218:
-                case 226:
-                case 269:
+                case 217 /* IfStatement */:
+                case 227 /* SwitchStatement */:
+                case 220 /* ForStatement */:
+                case 221 /* ForInStatement */:
+                case 222 /* ForOfStatement */:
+                case 219 /* WhileStatement */:
+                case 230 /* TryStatement */:
+                case 218 /* DoStatement */:
+                case 226 /* WithStatement */:
+                // TODO
+                // case SyntaxKind.ElseClause:
+                case 269 /* CatchClause */:
                     return true;
                 default:
                     return false;
             }
         }
         function isObjectContext(context) {
-            return context.contextNode.kind === 184;
+            return context.contextNode.kind === 184 /* ObjectLiteralExpression */;
         }
         function isFunctionCallContext(context) {
-            return context.contextNode.kind === 187;
+            return context.contextNode.kind === 187 /* CallExpression */;
         }
         function isNewContext(context) {
-            return context.contextNode.kind === 188;
+            return context.contextNode.kind === 188 /* NewExpression */;
         }
         function isFunctionCallOrNewContext(context) {
             return isFunctionCallContext(context) || isNewContext(context);
         }
         function isPreviousTokenNotComma(context) {
-            return context.currentTokenSpan.kind !== 26;
+            return context.currentTokenSpan.kind !== 26 /* CommaToken */;
         }
         function isNextTokenNotCloseBracket(context) {
-            return context.nextTokenSpan.kind !== 22;
+            return context.nextTokenSpan.kind !== 22 /* CloseBracketToken */;
         }
         function isArrowFunctionContext(context) {
-            return context.contextNode.kind === 193;
+            return context.contextNode.kind === 193 /* ArrowFunction */;
         }
         function isImportTypeContext(context) {
-            return context.contextNode.kind === 179;
+            return context.contextNode.kind === 179 /* ImportType */;
         }
         function isNonJsxSameLineTokenContext(context) {
-            return context.TokensAreOnSameLine() && context.contextNode.kind !== 10;
+            return context.TokensAreOnSameLine() && context.contextNode.kind !== 10 /* JsxText */;
         }
         function isNonJsxElementOrFragmentContext(context) {
-            return context.contextNode.kind !== 255 && context.contextNode.kind !== 259;
+            return context.contextNode.kind !== 255 /* JsxElement */ && context.contextNode.kind !== 259 /* JsxFragment */;
         }
         function isJsxExpressionContext(context) {
-            return context.contextNode.kind === 265 || context.contextNode.kind === 264;
+            return context.contextNode.kind === 265 /* JsxExpression */ || context.contextNode.kind === 264 /* JsxSpreadAttribute */;
         }
         function isNextTokenParentJsxAttribute(context) {
-            return context.nextTokenParent.kind === 262;
+            return context.nextTokenParent.kind === 262 /* JsxAttribute */;
         }
         function isJsxAttributeContext(context) {
-            return context.contextNode.kind === 262;
+            return context.contextNode.kind === 262 /* JsxAttribute */;
         }
         function isJsxSelfClosingElementContext(context) {
-            return context.contextNode.kind === 256;
+            return context.contextNode.kind === 256 /* JsxSelfClosingElement */;
         }
         function isNotBeforeBlockInFunctionDeclarationContext(context) {
             return !isFunctionDeclContext(context) && !isBeforeBlockContext(context);
@@ -81449,45 +99011,45 @@ var ts;
             while (ts.isExpressionNode(node)) {
                 node = node.parent;
             }
-            return node.kind === 150;
+            return node.kind === 150 /* Decorator */;
         }
         function isStartOfVariableDeclarationList(context) {
-            return context.currentTokenParent.kind === 233 &&
+            return context.currentTokenParent.kind === 233 /* VariableDeclarationList */ &&
                 context.currentTokenParent.getStart(context.sourceFile) === context.currentTokenSpan.pos;
         }
         function isNotFormatOnEnter(context) {
-            return context.formattingRequestKind !== 2;
+            return context.formattingRequestKind !== 2 /* FormatOnEnter */;
         }
         function isModuleDeclContext(context) {
-            return context.contextNode.kind === 239;
+            return context.contextNode.kind === 239 /* ModuleDeclaration */;
         }
         function isObjectTypeContext(context) {
-            return context.contextNode.kind === 166;
+            return context.contextNode.kind === 166 /* TypeLiteral */; // && context.contextNode.parent.kind !== SyntaxKind.InterfaceDeclaration;
         }
         function isConstructorSignatureContext(context) {
-            return context.contextNode.kind === 159;
+            return context.contextNode.kind === 159 /* ConstructSignature */;
         }
         function isTypeArgumentOrParameterOrAssertion(token, parent) {
-            if (token.kind !== 27 && token.kind !== 29) {
+            if (token.kind !== 27 /* LessThanToken */ && token.kind !== 29 /* GreaterThanToken */) {
                 return false;
             }
             switch (parent.kind) {
-                case 162:
-                case 190:
-                case 237:
-                case 235:
-                case 205:
-                case 236:
-                case 234:
-                case 192:
-                case 193:
-                case 154:
-                case 153:
-                case 158:
-                case 159:
-                case 187:
-                case 188:
-                case 207:
+                case 162 /* TypeReference */:
+                case 190 /* TypeAssertionExpression */:
+                case 237 /* TypeAliasDeclaration */:
+                case 235 /* ClassDeclaration */:
+                case 205 /* ClassExpression */:
+                case 236 /* InterfaceDeclaration */:
+                case 234 /* FunctionDeclaration */:
+                case 192 /* FunctionExpression */:
+                case 193 /* ArrowFunction */:
+                case 154 /* MethodDeclaration */:
+                case 153 /* MethodSignature */:
+                case 158 /* CallSignature */:
+                case 159 /* ConstructSignature */:
+                case 187 /* CallExpression */:
+                case 188 /* NewExpression */:
+                case 207 /* ExpressionWithTypeArguments */:
                     return true;
                 default:
                     return false;
@@ -81498,19 +99060,20 @@ var ts;
                 isTypeArgumentOrParameterOrAssertion(context.nextTokenSpan, context.nextTokenParent);
         }
         function isTypeAssertionContext(context) {
-            return context.contextNode.kind === 190;
+            return context.contextNode.kind === 190 /* TypeAssertionExpression */;
         }
         function isVoidOpContext(context) {
-            return context.currentTokenSpan.kind === 105 && context.currentTokenParent.kind === 196;
+            return context.currentTokenSpan.kind === 105 /* VoidKeyword */ && context.currentTokenParent.kind === 196 /* VoidExpression */;
         }
         function isYieldOrYieldStarWithOperand(context) {
-            return context.contextNode.kind === 203 && context.contextNode.expression !== undefined;
+            return context.contextNode.kind === 203 /* YieldExpression */ && context.contextNode.expression !== undefined;
         }
         function isNonNullAssertionContext(context) {
-            return context.contextNode.kind === 209;
+            return context.contextNode.kind === 209 /* NonNullExpression */;
         }
     })(formatting = ts.formatting || (ts.formatting = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var formatting;
@@ -81534,7 +99097,9 @@ var ts;
             };
         }
         function buildMap(rules) {
+            // Map from bucket index to array of rules
             var map = new Array(mapRowLength * mapRowLength);
+            // This array is used only during construction of the rulesbucket in the map
             var rulesBucketConstructionStateList = new Array(map.length);
             for (var _i = 0, rules_1 = rules; _i < rules_1.length; _i++) {
                 var rule = rules_1[_i];
@@ -81555,12 +99120,12 @@ var ts;
             return map;
         }
         function getRuleBucketIndex(row, column) {
-            ts.Debug.assert(row <= 145 && column <= 145, "Must compute formatting context from tokens");
+            ts.Debug.assert(row <= 145 /* LastKeyword */ && column <= 145 /* LastKeyword */, "Must compute formatting context from tokens");
             return (row * mapRowLength) + column;
         }
         var maskBitSize = 5;
-        var mask = 31;
-        var mapRowLength = 145 + 1;
+        var mask = 31; // MaskBitSize bits
+        var mapRowLength = 145 /* LastToken */ + 1;
         var RulesPosition;
         (function (RulesPosition) {
             RulesPosition[RulesPosition["IgnoreRulesSpecific"] = 0] = "IgnoreRulesSpecific";
@@ -81570,8 +99135,23 @@ var ts;
             RulesPosition[RulesPosition["NoContextRulesSpecific"] = maskBitSize * 4] = "NoContextRulesSpecific";
             RulesPosition[RulesPosition["NoContextRulesAny"] = maskBitSize * 5] = "NoContextRulesAny";
         })(RulesPosition || (RulesPosition = {}));
+        // The Rules list contains all the inserted rules into a rulebucket in the following order:
+        //    1- Ignore rules with specific token combination
+        //    2- Ignore rules with any token combination
+        //    3- Context rules with specific token combination
+        //    4- Context rules with any token combination
+        //    5- Non-context rules with specific token combination
+        //    6- Non-context rules with any token combination
+        //
+        // The member rulesInsertionIndexBitmap is used to describe the number of rules
+        // in each sub-bucket (above) hence can be used to know the index of where to insert
+        // the next rule. It's a bitmap which contains 6 different sections each is given 5 bits.
+        //
+        // Example:
+        // In order to insert a rule to the end of sub-bucket (3), we get the index by adding
+        // the values in the bitmap segments 3rd, 2nd, and 1st.
         function addRule(rules, rule, specificTokens, constructionState, rulesBucketIndex) {
-            var position = rule.action === 1
+            var position = rule.action === 1 /* Ignore */
                 ? specificTokens ? RulesPosition.IgnoreRulesSpecific : RulesPosition.IgnoreRulesAny
                 : rule.context !== formatting.anyContext
                     ? specificTokens ? RulesPosition.ContextRulesSpecific : RulesPosition.ContextRulesAny
@@ -81595,6 +99175,7 @@ var ts;
         }
     })(formatting = ts.formatting || (ts.formatting = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var formatting;
@@ -81608,42 +99189,64 @@ var ts;
             if (line === 0) {
                 return [];
             }
+            // After the enter key, the cursor is now at a new line. The new line may or may not contain non-whitespace characters.
+            // If the new line has only whitespaces, we won't want to format this line, because that would remove the indentation as
+            // trailing whitespaces. So the end of the formatting span should be the later one between:
+            //  1. the end of the previous line
+            //  2. the last non-whitespace character in the current line
             var endOfFormatSpan = ts.getEndLinePosition(line, sourceFile);
             while (ts.isWhiteSpaceSingleLine(sourceFile.text.charCodeAt(endOfFormatSpan))) {
                 endOfFormatSpan--;
             }
+            // if the character at the end of the span is a line break, we shouldn't include it, because it indicates we don't want to
+            // touch the current line at all. Also, on some OSes the line break consists of two characters (\r\n), we should test if the
+            // previous character before the end of format span is line break character as well.
             if (ts.isLineBreak(sourceFile.text.charCodeAt(endOfFormatSpan))) {
                 endOfFormatSpan--;
             }
             var span = {
+                // get start position for the previous line
                 pos: ts.getStartPositionOfLine(line - 1, sourceFile),
+                // end value is exclusive so add 1 to the result
                 end: endOfFormatSpan + 1
             };
-            return formatSpan(span, sourceFile, formatContext, 2);
+            return formatSpan(span, sourceFile, formatContext, 2 /* FormatOnEnter */);
         }
         formatting.formatOnEnter = formatOnEnter;
         function formatOnSemicolon(position, sourceFile, formatContext) {
-            var semicolon = findImmediatelyPrecedingTokenOfKind(position, 25, sourceFile);
-            return formatNodeLines(findOutermostNodeWithinListLevel(semicolon), sourceFile, formatContext, 3);
+            var semicolon = findImmediatelyPrecedingTokenOfKind(position, 25 /* SemicolonToken */, sourceFile);
+            return formatNodeLines(findOutermostNodeWithinListLevel(semicolon), sourceFile, formatContext, 3 /* FormatOnSemicolon */);
         }
         formatting.formatOnSemicolon = formatOnSemicolon;
         function formatOnOpeningCurly(position, sourceFile, formatContext) {
-            var openingCurly = findImmediatelyPrecedingTokenOfKind(position, 17, sourceFile);
+            var openingCurly = findImmediatelyPrecedingTokenOfKind(position, 17 /* OpenBraceToken */, sourceFile);
             if (!openingCurly) {
                 return [];
             }
             var curlyBraceRange = openingCurly.parent;
             var outermostNode = findOutermostNodeWithinListLevel(curlyBraceRange);
+            /**
+             * We limit the span to end at the opening curly to handle the case where
+             * the brace matched to that just typed will be incorrect after further edits.
+             * For example, we could type the opening curly for the following method
+             * body without brace-matching activated:
+             * ```
+             * class C {
+             *     foo()
+             * }
+             * ```
+             * and we wouldn't want to move the closing brace.
+             */
             var textRange = {
                 pos: ts.getLineStartPositionForPosition(outermostNode.getStart(sourceFile), sourceFile),
                 end: position
             };
-            return formatSpan(textRange, sourceFile, formatContext, 4);
+            return formatSpan(textRange, sourceFile, formatContext, 4 /* FormatOnOpeningCurlyBrace */);
         }
         formatting.formatOnOpeningCurly = formatOnOpeningCurly;
         function formatOnClosingCurly(position, sourceFile, formatContext) {
-            var precedingToken = findImmediatelyPrecedingTokenOfKind(position, 18, sourceFile);
-            return formatNodeLines(findOutermostNodeWithinListLevel(precedingToken), sourceFile, formatContext, 5);
+            var precedingToken = findImmediatelyPrecedingTokenOfKind(position, 18 /* CloseBraceToken */, sourceFile);
+            return formatNodeLines(findOutermostNodeWithinListLevel(precedingToken), sourceFile, formatContext, 5 /* FormatOnClosingCurlyBrace */);
         }
         formatting.formatOnClosingCurly = formatOnClosingCurly;
         function formatDocument(sourceFile, formatContext) {
@@ -81651,23 +99254,41 @@ var ts;
                 pos: 0,
                 end: sourceFile.text.length
             };
-            return formatSpan(span, sourceFile, formatContext, 0);
+            return formatSpan(span, sourceFile, formatContext, 0 /* FormatDocument */);
         }
         formatting.formatDocument = formatDocument;
         function formatSelection(start, end, sourceFile, formatContext) {
+            // format from the beginning of the line
             var span = {
                 pos: ts.getLineStartPositionForPosition(start, sourceFile),
                 end: end,
             };
-            return formatSpan(span, sourceFile, formatContext, 1);
+            return formatSpan(span, sourceFile, formatContext, 1 /* FormatSelection */);
         }
         formatting.formatSelection = formatSelection;
+        /**
+         * Validating `expectedTokenKind` ensures the token was typed in the context we expect (eg: not a comment).
+         * @param expectedTokenKind The kind of the last token constituting the desired parent node.
+         */
         function findImmediatelyPrecedingTokenOfKind(end, expectedTokenKind, sourceFile) {
             var precedingToken = ts.findPrecedingToken(end, sourceFile);
             return precedingToken && precedingToken.kind === expectedTokenKind && end === precedingToken.getEnd() ?
                 precedingToken :
                 undefined;
         }
+        /**
+         * Finds the highest node enclosing `node` at the same list level as `node`
+         * and whose end does not exceed `node.end`.
+         *
+         * Consider typing the following
+         * ```
+         * let x = 1;
+         * while (true) {
+         * }
+         * ```
+         * Upon typing the closing curly, we want to format the entire `while`-statement, but not the preceding
+         * variable declaration.
+         */
         function findOutermostNodeWithinListLevel(node) {
             var current = node;
             while (current &&
@@ -81678,23 +99299,26 @@ var ts;
             }
             return current;
         }
+        // Returns true if node is a element in some list in parent
+        // i.e. parent is class declaration with the list of members and node is one of members.
         function isListElement(parent, node) {
             switch (parent.kind) {
-                case 235:
-                case 236:
+                case 235 /* ClassDeclaration */:
+                case 236 /* InterfaceDeclaration */:
                     return ts.rangeContainsRange(parent.members, node);
-                case 239:
+                case 239 /* ModuleDeclaration */:
                     var body = parent.body;
-                    return !!body && body.kind === 240 && ts.rangeContainsRange(body.statements, node);
-                case 274:
-                case 213:
-                case 240:
+                    return !!body && body.kind === 240 /* ModuleBlock */ && ts.rangeContainsRange(body.statements, node);
+                case 274 /* SourceFile */:
+                case 213 /* Block */:
+                case 240 /* ModuleBlock */:
                     return ts.rangeContainsRange(parent.statements, node);
-                case 269:
+                case 269 /* CatchClause */:
                     return ts.rangeContainsRange(parent.block.statements, node);
             }
             return false;
         }
+        /** find node that fully contains given text range */
         function findEnclosingNode(range, sourceFile) {
             return find(sourceFile);
             function find(n) {
@@ -81708,27 +99332,37 @@ var ts;
                 return n;
             }
         }
+        /** formatting is not applied to ranges that contain parse errors.
+         * This function will return a predicate that for a given text range will tell
+         * if there are any parse errors that overlap with the range.
+         */
         function prepareRangeContainsErrorFunction(errors, originalRange) {
             if (!errors.length) {
                 return rangeHasNoErrors;
             }
+            // pick only errors that fall in range
             var sorted = errors
-                .filter(function (d) { return ts.rangeOverlapsWithStartEnd(originalRange, d.start, d.start + d.length); })
+                .filter(function (d) { return ts.rangeOverlapsWithStartEnd(originalRange, d.start, d.start + d.length); }) // TODO: GH#18217
                 .sort(function (e1, e2) { return e1.start - e2.start; });
             if (!sorted.length) {
                 return rangeHasNoErrors;
             }
             var index = 0;
             return function (r) {
+                // in current implementation sequence of arguments [r1, r2...] is monotonically increasing.
+                // 'index' tracks the index of the most recent error that was checked.
                 while (true) {
                     if (index >= sorted.length) {
+                        // all errors in the range were already checked -> no error in specified range
                         return false;
                     }
                     var error = sorted[index];
                     if (r.end <= error.start) {
+                        // specified range ends before the error refered by 'index' - no error in range
                         return false;
                     }
                     if (ts.startEndOverlapsWithStartEnd(r.pos, r.end, error.start, error.start + error.length)) {
+                        // specified range overlaps with error range
                         return true;
                     }
                     index++;
@@ -81738,6 +99372,11 @@ var ts;
                 return false;
             }
         }
+        /**
+         * Start of the original range might fall inside the comment - scanner will not yield appropriate results
+         * This function will look for token that is located before the start of target range
+         * and return its end as start position for the scanner.
+         */
         function getScanStartPosition(enclosingNode, originalRange, sourceFile) {
             var start = enclosingNode.getStart(sourceFile);
             if (start === originalRange.pos && enclosingNode.end === originalRange.end) {
@@ -81745,19 +99384,37 @@ var ts;
             }
             var precedingToken = ts.findPrecedingToken(originalRange.pos, sourceFile);
             if (!precedingToken) {
+                // no preceding token found - start from the beginning of enclosing node
                 return enclosingNode.pos;
             }
+            // preceding token ends after the start of original range (i.e when originalRange.pos falls in the middle of literal)
+            // start from the beginning of enclosingNode to handle the entire 'originalRange'
             if (precedingToken.end >= originalRange.pos) {
                 return enclosingNode.pos;
             }
             return precedingToken.end;
         }
+        /*
+         * For cases like
+         * if (a ||
+         *     b ||$
+         *     c) {...}
+         * If we hit Enter at $ we want line '    b ||' to be indented.
+         * Formatting will be applied to the last two lines.
+         * Node that fully encloses these lines is binary expression 'a ||...'.
+         * Initial indentation for this node will be 0.
+         * Binary expressions don't introduce new indentation scopes, however it is possible
+         * that some parent node on the same line does - like if statement in this case.
+         * Note that we are considering parents only from the same line with initial node -
+         * if parent is on the different line - its delta was already contributed
+         * to the initial indentation.
+         */
         function getOwnOrInheritedDelta(n, options, sourceFile) {
-            var previousLine = -1;
+            var previousLine = -1 /* Unknown */;
             var child;
             while (n) {
                 var line = sourceFile.getLineAndCharacterOfPosition(n.getStart(sourceFile)).line;
-                if (previousLine !== -1 && line !== previousLine) {
+                if (previousLine !== -1 /* Unknown */ && line !== previousLine) {
                     break;
                 }
                 if (formatting.SmartIndenter.shouldIndentChildNode(options, n, child, sourceFile)) {
@@ -81769,9 +99426,11 @@ var ts;
             }
             return 0;
         }
+        /* @internal */
         function formatNodeGivenIndentation(node, sourceFileLike, languageVariant, initialIndentation, delta, formatContext) {
             var range = { pos: 0, end: sourceFileLike.text.length };
-            return formatting.getFormattingScanner(sourceFileLike.text, languageVariant, range.pos, range.end, function (scanner) { return formatSpanWorker(range, node, initialIndentation, delta, scanner, formatContext, 1, function (_) { return false; }, sourceFileLike); });
+            return formatting.getFormattingScanner(sourceFileLike.text, languageVariant, range.pos, range.end, function (scanner) { return formatSpanWorker(range, node, initialIndentation, delta, scanner, formatContext, 1 /* FormatSelection */, function (_) { return false; }, // assume that node does not have any errors
+            sourceFileLike); });
         }
         formatting.formatNodeGivenIndentation = formatNodeGivenIndentation;
         function formatNodeLines(node, sourceFile, formatContext, requestKind) {
@@ -81785,11 +99444,13 @@ var ts;
             return formatSpan(span, sourceFile, formatContext, requestKind);
         }
         function formatSpan(originalRange, sourceFile, formatContext, requestKind) {
+            // find the smallest node that fully wraps the range and compute the initial indentation for the node
             var enclosingNode = findEnclosingNode(originalRange, sourceFile);
             return formatting.getFormattingScanner(sourceFile.text, sourceFile.languageVariant, getScanStartPosition(enclosingNode, originalRange, sourceFile), originalRange.end, function (scanner) { return formatSpanWorker(originalRange, enclosingNode, formatting.SmartIndenter.getIndentationForNode(enclosingNode, originalRange, sourceFile, formatContext.options), getOwnOrInheritedDelta(enclosingNode, formatContext.options, sourceFile), scanner, formatContext, requestKind, prepareRangeContainsErrorFunction(sourceFile.parseDiagnostics, originalRange), sourceFile); });
         }
         function formatSpanWorker(originalRange, enclosingNode, initialIndentation, delta, formattingScanner, _a, requestKind, rangeContainsError, sourceFile) {
             var options = _a.options, getRule = _a.getRule;
+            // formatting context is used by rules provider
             var formattingContext = new formatting.FormattingContext(sourceFile, requestKind, options);
             var previousRange;
             var previousParent;
@@ -81809,15 +99470,23 @@ var ts;
             if (!formattingScanner.isOnToken()) {
                 var leadingTrivia = formattingScanner.getCurrentLeadingTrivia();
                 if (leadingTrivia) {
-                    processTrivia(leadingTrivia, enclosingNode, enclosingNode, undefined);
+                    processTrivia(leadingTrivia, enclosingNode, enclosingNode, /*dynamicIndentation*/ undefined); // TODO: GH#18217
                     trimTrailingWhitespacesForRemainingRange();
                 }
             }
             return edits;
+            // local functions
+            /** Tries to compute the indentation for a list element.
+             * If list element is not in range then
+             * function will pick its actual indentation
+             * so it can be pushed downstream as inherited indentation.
+             * If list element is in the range - its indentation will be equal
+             * to inherited indentation from its predecessors.
+             */
             function tryComputeIndentationForListItem(startPos, endPos, parentStartLine, range, inheritedIndentation) {
                 if (ts.rangeOverlapsWithStartEnd(range, startPos, endPos) ||
-                    ts.rangeContainsStartEnd(range, startPos, endPos)) {
-                    if (inheritedIndentation !== -1) {
+                    ts.rangeContainsStartEnd(range, startPos, endPos) /* Not to miss zero-range nodes e.g. JsxText */) {
+                    if (inheritedIndentation !== -1 /* Unknown */) {
                         return inheritedIndentation;
                     }
                 }
@@ -81826,22 +99495,29 @@ var ts;
                     var startLinePosition = ts.getLineStartPositionForPosition(startPos, sourceFile);
                     var column = formatting.SmartIndenter.findFirstNonWhitespaceColumn(startLinePosition, startPos, sourceFile, options);
                     if (startLine !== parentStartLine || startPos === column) {
+                        // Use the base indent size if it is greater than
+                        // the indentation of the inherited predecessor.
                         var baseIndentSize = formatting.SmartIndenter.getBaseIndentation(options);
                         return baseIndentSize > column ? baseIndentSize : column;
                     }
                 }
-                return -1;
+                return -1 /* Unknown */;
             }
             function computeIndentation(node, startLine, inheritedIndentation, parent, parentDynamicIndentation, effectiveParentStartLine) {
                 var delta = formatting.SmartIndenter.shouldIndentChildNode(options, node) ? options.indentSize : 0;
                 if (effectiveParentStartLine === startLine) {
+                    // if node is located on the same line with the parent
+                    // - inherit indentation from the parent
+                    // - push children if either parent of node itself has non-zero delta
                     return {
                         indentation: startLine === lastIndentedLine ? indentationOnLastIndentedLine : parentDynamicIndentation.getIndentation(),
                         delta: Math.min(options.indentSize, parentDynamicIndentation.getDelta(node) + delta)
                     };
                 }
-                else if (inheritedIndentation === -1) {
-                    if (node.kind === 19 && startLine === lastIndentedLine) {
+                else if (inheritedIndentation === -1 /* Unknown */) {
+                    if (node.kind === 19 /* OpenParenToken */ && startLine === lastIndentedLine) {
+                        // the is used for chaining methods formatting
+                        // - we need to get the indentation on last line and the delta of parent
                         return { indentation: indentationOnLastIndentedLine, delta: parentDynamicIndentation.getDelta(node) };
                     }
                     else if (formatting.SmartIndenter.childStartsOnTheSameLineWithElseInIfStatement(parent, node, startLine, sourceFile)) {
@@ -81860,18 +99536,19 @@ var ts;
                     return node.modifiers[0].kind;
                 }
                 switch (node.kind) {
-                    case 235: return 75;
-                    case 236: return 109;
-                    case 234: return 89;
-                    case 238: return 238;
-                    case 156: return 125;
-                    case 157: return 136;
-                    case 154:
+                    case 235 /* ClassDeclaration */: return 75 /* ClassKeyword */;
+                    case 236 /* InterfaceDeclaration */: return 109 /* InterfaceKeyword */;
+                    case 234 /* FunctionDeclaration */: return 89 /* FunctionKeyword */;
+                    case 238 /* EnumDeclaration */: return 238 /* EnumDeclaration */;
+                    case 156 /* GetAccessor */: return 125 /* GetKeyword */;
+                    case 157 /* SetAccessor */: return 136 /* SetKeyword */;
+                    case 154 /* MethodDeclaration */:
                         if (node.asteriskToken) {
-                            return 39;
+                            return 39 /* AsteriskToken */;
                         }
-                    case 152:
-                    case 149:
+                    // falls through
+                    case 152 /* PropertyDeclaration */:
+                    case 149 /* Parameter */:
                         return ts.getNameOfDeclaration(node).kind;
                 }
             }
@@ -81879,12 +99556,16 @@ var ts;
                 return {
                     getIndentationForComment: function (kind, tokenIndentation, container) {
                         switch (kind) {
-                            case 18:
-                            case 22:
-                            case 20:
+                            // preceding comment to the token that closes the indentation scope inherits the indentation from the scope
+                            // ..  {
+                            //     // comment
+                            // }
+                            case 18 /* CloseBraceToken */:
+                            case 22 /* CloseBracketToken */:
+                            case 20 /* CloseParenToken */:
                                 return indentation + getDelta(container);
                         }
-                        return tokenIndentation !== -1 ? tokenIndentation : indentation;
+                        return tokenIndentation !== -1 /* Unknown */ ? tokenIndentation : indentation;
                     },
                     getIndentationForToken: function (line, kind, container) {
                         return shouldAddDelta(line, kind, container) ? indentation + getDelta(container) : indentation;
@@ -81900,35 +99581,39 @@ var ts;
                 };
                 function shouldAddDelta(line, kind, container) {
                     switch (kind) {
-                        case 17:
-                        case 18:
-                        case 19:
-                        case 20:
-                        case 82:
-                        case 106:
-                        case 57:
+                        // open and close brace, 'else' and 'while' (in do statement) tokens has indentation of the parent
+                        case 17 /* OpenBraceToken */:
+                        case 18 /* CloseBraceToken */:
+                        case 19 /* OpenParenToken */:
+                        case 20 /* CloseParenToken */:
+                        case 82 /* ElseKeyword */:
+                        case 106 /* WhileKeyword */:
+                        case 57 /* AtToken */:
                             return false;
-                        case 41:
-                        case 29:
+                        case 41 /* SlashToken */:
+                        case 29 /* GreaterThanToken */:
                             switch (container.kind) {
-                                case 257:
-                                case 258:
-                                case 256:
+                                case 257 /* JsxOpeningElement */:
+                                case 258 /* JsxClosingElement */:
+                                case 256 /* JsxSelfClosingElement */:
                                     return false;
                             }
                             break;
-                        case 21:
-                        case 22:
-                            if (container.kind !== 177) {
+                        case 21 /* OpenBracketToken */:
+                        case 22 /* CloseBracketToken */:
+                            if (container.kind !== 177 /* MappedType */) {
                                 return false;
                             }
                             break;
                     }
+                    // if token line equals to the line of containing node (this is a first token in the node) - use node indentation
                     return nodeStartLine !== line
+                        // if this token is the first token following the list of decorators, we do not need to indent
                         && !(node.decorators && kind === getFirstNonDecoratorTokenOfNode(node));
                 }
                 function getDelta(child) {
-                    return formatting.SmartIndenter.nodeWillIndentChild(options, node, child, sourceFile, true) ? delta : 0;
+                    // Delta value should be zero when the node explicitly prevents indentation of the child node
+                    return formatting.SmartIndenter.nodeWillIndentChild(options, node, child, sourceFile, /*indentByDefault*/ true) ? delta : 0;
                 }
             }
             function processNode(node, contextNode, nodeStartLine, undecoratedNodeStartLine, indentation, delta) {
@@ -81936,12 +99621,26 @@ var ts;
                     return;
                 }
                 var nodeDynamicIndentation = getDynamicIndentation(node, nodeStartLine, indentation, delta);
+                // a useful observations when tracking context node
+                //        /
+                //      [a]
+                //   /   |   \
+                //  [b] [c] [d]
+                // node 'a' is a context node for nodes 'b', 'c', 'd'
+                // except for the leftmost leaf token in [b] - in this case context node ('e') is located somewhere above 'a'
+                // this rule can be applied recursively to child nodes of 'a'.
+                //
+                // context node is set to parent node value after processing every child node
+                // context node is set to parent of the token after processing every token
                 var childContextNode = contextNode;
+                // if there are any tokens that logically belong to node and interleave child nodes
+                // such tokens will be consumed in processChildNode for the child that follows them
                 ts.forEachChild(node, function (child) {
-                    processChildNode(child, -1, node, nodeDynamicIndentation, nodeStartLine, undecoratedNodeStartLine, false);
+                    processChildNode(child, /*inheritedIndentation*/ -1 /* Unknown */, node, nodeDynamicIndentation, nodeStartLine, undecoratedNodeStartLine, /*isListItem*/ false);
                 }, function (nodes) {
                     processChildNodes(nodes, node, nodeStartLine, nodeDynamicIndentation);
                 });
+                // proceed any tokens in the node that are located after child nodes
                 while (formattingScanner.isOnToken()) {
                     var tokenInfo = formattingScanner.readTokenInfo(node);
                     if (tokenInfo.token.end > node.end) {
@@ -81956,13 +99655,15 @@ var ts;
                     if (child.decorators) {
                         undecoratedChildStartLine = sourceFile.getLineAndCharacterOfPosition(ts.getNonDecoratorTokenPosOfNode(child, sourceFile)).line;
                     }
-                    var childIndentationAmount = -1;
+                    // if child is a list item - try to get its indentation, only if parent is within the original range.
+                    var childIndentationAmount = -1 /* Unknown */;
                     if (isListItem && ts.rangeContainsRange(originalRange, parent)) {
                         childIndentationAmount = tryComputeIndentationForListItem(childStartPos, child.end, parentStartLine, originalRange, inheritedIndentation);
-                        if (childIndentationAmount !== -1) {
+                        if (childIndentationAmount !== -1 /* Unknown */) {
                             inheritedIndentation = childIndentationAmount;
                         }
                     }
+                    // child node is outside the target range - do not dive inside
                     if (!ts.rangeOverlapsWithStartEnd(originalRange, child.pos, child.end)) {
                         if (child.end < originalRange.pos) {
                             formattingScanner.skipToEndOf(child);
@@ -81973,8 +99674,10 @@ var ts;
                         return inheritedIndentation;
                     }
                     while (formattingScanner.isOnToken()) {
+                        // proceed any parent tokens that are located prior to child.getStart()
                         var tokenInfo = formattingScanner.readTokenInfo(node);
                         if (tokenInfo.token.end > childStartPos) {
+                            // stop when formatting scanner advances past the beginning of the child
                             break;
                         }
                         consumeTokenAndAdvanceScanner(tokenInfo, node, parentDynamicIndentation, node);
@@ -81982,21 +99685,23 @@ var ts;
                     if (!formattingScanner.isOnToken()) {
                         return inheritedIndentation;
                     }
-                    if (ts.isToken(child) && child.kind !== 10) {
+                    // JSX text shouldn't affect indenting
+                    if (ts.isToken(child) && child.kind !== 10 /* JsxText */) {
+                        // if child node is a token, it does not impact indentation, proceed it using parent indentation scope rules
                         var tokenInfo = formattingScanner.readTokenInfo(child);
                         ts.Debug.assert(tokenInfo.token.end === child.end, "Token end is child end");
                         consumeTokenAndAdvanceScanner(tokenInfo, node, parentDynamicIndentation, child);
                         return inheritedIndentation;
                     }
-                    var effectiveParentStartLine = child.kind === 150 ? childStartLine : undecoratedParentStartLine;
+                    var effectiveParentStartLine = child.kind === 150 /* Decorator */ ? childStartLine : undecoratedParentStartLine;
                     var childIndentation = computeIndentation(child, childStartLine, childIndentationAmount, node, parentDynamicIndentation, effectiveParentStartLine);
                     processNode(child, childContextNode, childStartLine, undecoratedChildStartLine, childIndentation.indentation, childIndentation.delta);
-                    if (child.kind === 10) {
+                    if (child.kind === 10 /* JsxText */) {
                         var range = { pos: child.getStart(), end: child.getEnd() };
-                        indentMultilineCommentOrJsxText(range, childIndentation.indentation, true, false);
+                        indentMultilineCommentOrJsxText(range, childIndentation.indentation, /*firstLineIsIndented*/ true, /*indentFinalLine*/ false);
                     }
                     childContextNode = node;
-                    if (isFirstListItem && parent.kind === 183 && inheritedIndentation === -1) {
+                    if (isFirstListItem && parent.kind === 183 /* ArrayLiteralExpression */ && inheritedIndentation === -1 /* Unknown */) {
                         inheritedIndentation = childIndentation.indentation;
                     }
                     return inheritedIndentation;
@@ -82007,32 +99712,41 @@ var ts;
                     var listEndToken = getCloseTokenForOpenToken(listStartToken);
                     var listDynamicIndentation = parentDynamicIndentation;
                     var startLine = parentStartLine;
-                    if (listStartToken !== 0) {
+                    if (listStartToken !== 0 /* Unknown */) {
+                        // introduce a new indentation scope for lists (including list start and end tokens)
                         while (formattingScanner.isOnToken()) {
                             var tokenInfo = formattingScanner.readTokenInfo(parent);
                             if (tokenInfo.token.end > nodes.pos) {
+                                // stop when formatting scanner moves past the beginning of node list
                                 break;
                             }
                             else if (tokenInfo.token.kind === listStartToken) {
+                                // consume list start token
                                 startLine = sourceFile.getLineAndCharacterOfPosition(tokenInfo.token.pos).line;
-                                var indentation_2 = computeIndentation(tokenInfo.token, startLine, -1, parent, parentDynamicIndentation, parentStartLine);
-                                listDynamicIndentation = getDynamicIndentation(parent, parentStartLine, indentation_2.indentation, indentation_2.delta);
+                                var indentation_1 = computeIndentation(tokenInfo.token, startLine, -1 /* Unknown */, parent, parentDynamicIndentation, parentStartLine);
+                                listDynamicIndentation = getDynamicIndentation(parent, parentStartLine, indentation_1.indentation, indentation_1.delta);
                                 consumeTokenAndAdvanceScanner(tokenInfo, parent, listDynamicIndentation, parent);
                             }
                             else {
+                                // consume any tokens that precede the list as child elements of 'node' using its indentation scope
                                 consumeTokenAndAdvanceScanner(tokenInfo, parent, parentDynamicIndentation, parent);
                             }
                         }
                     }
-                    var inheritedIndentation = -1;
+                    var inheritedIndentation = -1 /* Unknown */;
                     for (var i = 0; i < nodes.length; i++) {
                         var child = nodes[i];
-                        inheritedIndentation = processChildNode(child, inheritedIndentation, node, listDynamicIndentation, startLine, startLine, true, i === 0);
+                        inheritedIndentation = processChildNode(child, inheritedIndentation, node, listDynamicIndentation, startLine, startLine, /*isListItem*/ true, /*isFirstListItem*/ i === 0);
                     }
-                    if (listEndToken !== 0) {
+                    if (listEndToken !== 0 /* Unknown */) {
                         if (formattingScanner.isOnToken()) {
                             var tokenInfo = formattingScanner.readTokenInfo(parent);
+                            // consume the list end token only if it is still belong to the parent
+                            // there might be the case when current token matches end token but does not considered as one
+                            // function (x: function) <--
+                            // without this check close paren will be interpreted as list end token for function expression which is wrong
                             if (tokenInfo.token.kind === listEndToken && ts.rangeContainsRange(parent, tokenInfo.token)) {
+                                // consume list end token
                                 consumeTokenAndAdvanceScanner(tokenInfo, parent, listDynamicIndentation, parent);
                             }
                         }
@@ -82045,20 +99759,23 @@ var ts;
                     if (currentTokenInfo.leadingTrivia) {
                         processTrivia(currentTokenInfo.leadingTrivia, parent, childContextNode, dynamicIndentation);
                     }
-                    var lineAction = 0;
+                    var lineAction = 0 /* None */;
                     var isTokenInRange = ts.rangeContainsRange(originalRange, currentTokenInfo.token);
                     var tokenStart = sourceFile.getLineAndCharacterOfPosition(currentTokenInfo.token.pos);
                     if (isTokenInRange) {
                         var rangeHasError = rangeContainsError(currentTokenInfo.token);
+                        // save previousRange since processRange will overwrite this value with current one
                         var savePreviousRange = previousRange;
                         lineAction = processRange(currentTokenInfo.token, tokenStart, parent, childContextNode, dynamicIndentation);
+                        // do not indent comments\token if token range overlaps with some error
                         if (!rangeHasError) {
-                            if (lineAction === 0) {
+                            if (lineAction === 0 /* None */) {
+                                // indent token only if end line of previous range does not match start line of the token
                                 var prevEndLine = savePreviousRange && sourceFile.getLineAndCharacterOfPosition(savePreviousRange.end).line;
                                 indentToken = lastTriviaWasNewLine && tokenStart.line !== prevEndLine;
                             }
                             else {
-                                indentToken = lineAction === 1;
+                                indentToken = lineAction === 1 /* LineAdded */;
                             }
                         }
                     }
@@ -82068,7 +99785,7 @@ var ts;
                     if (indentToken) {
                         var tokenIndentation = (isTokenInRange && !rangeContainsError(currentTokenInfo.token)) ?
                             dynamicIndentation.getIndentationForToken(tokenStart.line, currentTokenInfo.token.kind, container) :
-                            -1;
+                            -1 /* Unknown */;
                         var indentNextTokenOrTrivia = true;
                         if (currentTokenInfo.leadingTrivia) {
                             var commentIndentation = dynamicIndentation.getIndentationForComment(currentTokenInfo.token.kind, tokenIndentation, container);
@@ -82076,26 +99793,27 @@ var ts;
                                 var triviaItem = _a[_i];
                                 var triviaInRange = ts.rangeContainsRange(originalRange, triviaItem);
                                 switch (triviaItem.kind) {
-                                    case 3:
+                                    case 3 /* MultiLineCommentTrivia */:
                                         if (triviaInRange) {
-                                            indentMultilineCommentOrJsxText(triviaItem, commentIndentation, !indentNextTokenOrTrivia);
+                                            indentMultilineCommentOrJsxText(triviaItem, commentIndentation, /*firstLineIsIndented*/ !indentNextTokenOrTrivia);
                                         }
                                         indentNextTokenOrTrivia = false;
                                         break;
-                                    case 2:
+                                    case 2 /* SingleLineCommentTrivia */:
                                         if (indentNextTokenOrTrivia && triviaInRange) {
-                                            insertIndentation(triviaItem.pos, commentIndentation, false);
+                                            insertIndentation(triviaItem.pos, commentIndentation, /*lineAdded*/ false);
                                         }
                                         indentNextTokenOrTrivia = false;
                                         break;
-                                    case 4:
+                                    case 4 /* NewLineTrivia */:
                                         indentNextTokenOrTrivia = true;
                                         break;
                                 }
                             }
                         }
-                        if (tokenIndentation !== -1 && indentNextTokenOrTrivia) {
-                            insertIndentation(currentTokenInfo.token.pos, tokenIndentation, lineAction === 1);
+                        // indent token only if is it is in target range and does not overlap with any error ranges
+                        if (tokenIndentation !== -1 /* Unknown */ && indentNextTokenOrTrivia) {
+                            insertIndentation(currentTokenInfo.token.pos, tokenIndentation, lineAction === 1 /* LineAdded */);
                             lastIndentedLine = tokenStart.line;
                             indentationOnLastIndentedLine = tokenIndentation;
                         }
@@ -82113,11 +99831,13 @@ var ts;
                     }
                 }
             }
+            // TODO: GH#18217 use an enum instead of `boolean | undefined`
             function processRange(range, rangeStart, parent, contextNode, dynamicIndentation) {
                 var rangeHasError = rangeContainsError(range);
-                var lineAction = 0;
+                var lineAction = 0 /* None */;
                 if (!rangeHasError) {
                     if (!previousRange) {
+                        // trim whitespaces starting from the beginning of the span up to the current line
                         var originalStart = sourceFile.getLineAndCharacterOfPosition(originalRange.pos);
                         trimTrailingWhitespacesForLines(originalStart.line, rangeStart.line);
                     }
@@ -82135,29 +99855,36 @@ var ts;
                 formattingContext.updateContext(previousItem, previousParent, currentItem, currentParent, contextNode);
                 var rule = getRule(formattingContext);
                 var trimTrailingWhitespaces;
-                var lineAction = 0;
+                var lineAction = 0 /* None */;
                 if (rule) {
                     lineAction = applyRuleEdits(rule, previousItem, previousStartLine, currentItem, currentStartLine);
                     switch (lineAction) {
-                        case 2:
+                        case 2 /* LineRemoved */:
+                            // Handle the case where the next line is moved to be the end of this line.
+                            // In this case we don't indent the next line in the next pass.
                             if (currentParent.getStart(sourceFile) === currentItem.pos) {
-                                dynamicIndentation.recomputeIndentation(false);
+                                dynamicIndentation.recomputeIndentation(/*lineAddedByFormatting*/ false);
                             }
                             break;
-                        case 1:
+                        case 1 /* LineAdded */:
+                            // Handle the case where token2 is moved to the new line.
+                            // In this case we indent token2 in the next pass but we set
+                            // sameLineIndent flag to notify the indenter that the indentation is within the line.
                             if (currentParent.getStart(sourceFile) === currentItem.pos) {
-                                dynamicIndentation.recomputeIndentation(true);
+                                dynamicIndentation.recomputeIndentation(/*lineAddedByFormatting*/ true);
                             }
                             break;
                         default:
-                            ts.Debug.assert(lineAction === 0);
+                            ts.Debug.assert(lineAction === 0 /* None */);
                     }
-                    trimTrailingWhitespaces = !(rule.action & 8) && rule.flags !== 1;
+                    // We need to trim trailing whitespace between the tokens if they were on different lines, and no rule was applied to put them on the same line
+                    trimTrailingWhitespaces = !(rule.action & 8 /* Delete */) && rule.flags !== 1 /* CanDeleteNewLines */;
                 }
                 else {
                     trimTrailingWhitespaces = true;
                 }
                 if (currentStartLine !== previousStartLine && trimTrailingWhitespaces) {
+                    // We need to trim trailing whitespace between the tokens if they were on different lines, and no rule was applied to put them on the same line
                     trimTrailingWhitespacesForLines(previousStartLine, currentStartLine, previousItem);
                 }
                 return lineAction;
@@ -82165,6 +99892,8 @@ var ts;
             function insertIndentation(pos, indentation, lineAdded) {
                 var indentationString = getIndentationString(indentation, options);
                 if (lineAdded) {
+                    // new line is added before the token by the formatting rules
+                    // insert indentation string at the very beginning of the token
                     recordReplace(pos, 0, indentationString);
                 }
                 else {
@@ -82178,7 +99907,7 @@ var ts;
             function characterToColumn(startLinePosition, characterInLine) {
                 var column = 0;
                 for (var i = 0; i < characterInLine; i++) {
-                    if (sourceFile.text.charCodeAt(startLinePosition + i) === 9) {
+                    if (sourceFile.text.charCodeAt(startLinePosition + i) === 9 /* tab */) {
                         column += options.tabSize - column % options.tabSize;
                     }
                     else {
@@ -82192,12 +99921,14 @@ var ts;
             }
             function indentMultilineCommentOrJsxText(commentRange, indentation, firstLineIsIndented, indentFinalLine) {
                 if (indentFinalLine === void 0) { indentFinalLine = true; }
+                // split comment in lines
                 var startLine = sourceFile.getLineAndCharacterOfPosition(commentRange.pos).line;
                 var endLine = sourceFile.getLineAndCharacterOfPosition(commentRange.end).line;
                 var parts;
                 if (startLine === endLine) {
                     if (!firstLineIsIndented) {
-                        insertIndentation(commentRange.pos, indentation, false);
+                        // treat as single line comment
+                        insertIndentation(commentRange.pos, indentation, /*lineAdded*/ false);
                     }
                     return;
                 }
@@ -82223,6 +99954,7 @@ var ts;
                     startIndex = 1;
                     startLine++;
                 }
+                // shift all parts on the delta size
                 var delta = indentation - nonWhitespaceColumnInFirstPart.column;
                 for (var i = startIndex; i < parts.length; i++, startLine++) {
                     var startLinePos_1 = ts.getStartPositionOfLine(startLine, sourceFile);
@@ -82243,6 +99975,7 @@ var ts;
                 for (var line = line1; line < line2; line++) {
                     var lineStartPosition = ts.getStartPositionOfLine(line, sourceFile);
                     var lineEndPosition = ts.getEndLinePosition(line, sourceFile);
+                    // do not trim whitespaces in comments or template expression
                     if (range && (ts.isComment(range.kind) || ts.isStringOrRegularExpressionOrTemplateLiteral(range.kind)) && range.pos <= lineEndPosition && range.end > lineEndPosition) {
                         continue;
                     }
@@ -82253,6 +99986,10 @@ var ts;
                     }
                 }
             }
+            /**
+             * @param start The position of the first character in range
+             * @param end The position of the last character in range
+             */
             function getTrailingWhitespaceStartPosition(start, end) {
                 var pos = end;
                 while (pos >= start && ts.isWhiteSpaceSingleLine(sourceFile.text.charCodeAt(pos))) {
@@ -82263,6 +100000,9 @@ var ts;
                 }
                 return -1;
             }
+            /**
+             * Trimming will be done for lines after the previous range
+             */
             function trimTrailingWhitespacesForRemainingRange() {
                 var startPosition = previousRange ? previousRange.end : originalRange.pos;
                 var startLine = sourceFile.getLineAndCharacterOfPosition(startPosition).line;
@@ -82282,35 +100022,42 @@ var ts;
             function applyRuleEdits(rule, previousRange, previousStartLine, currentRange, currentStartLine) {
                 var onLaterLine = currentStartLine !== previousStartLine;
                 switch (rule.action) {
-                    case 1:
-                        return 0;
-                    case 8:
+                    case 1 /* Ignore */:
+                        // no action required
+                        return 0 /* None */;
+                    case 8 /* Delete */:
                         if (previousRange.end !== currentRange.pos) {
+                            // delete characters starting from t1.end up to t2.pos exclusive
                             recordDelete(previousRange.end, currentRange.pos - previousRange.end);
-                            return onLaterLine ? 2 : 0;
+                            return onLaterLine ? 2 /* LineRemoved */ : 0 /* None */;
                         }
                         break;
-                    case 4:
-                        if (rule.flags !== 1 && previousStartLine !== currentStartLine) {
-                            return 0;
+                    case 4 /* NewLine */:
+                        // exit early if we on different lines and rule cannot change number of newlines
+                        // if line1 and line2 are on subsequent lines then no edits are required - ok to exit
+                        // if line1 and line2 are separated with more than one newline - ok to exit since we cannot delete extra new lines
+                        if (rule.flags !== 1 /* CanDeleteNewLines */ && previousStartLine !== currentStartLine) {
+                            return 0 /* None */;
                         }
+                        // edit should not be applied if we have one line feed between elements
                         var lineDelta = currentStartLine - previousStartLine;
                         if (lineDelta !== 1) {
                             recordReplace(previousRange.end, currentRange.pos - previousRange.end, options.newLineCharacter);
-                            return onLaterLine ? 0 : 1;
+                            return onLaterLine ? 0 /* None */ : 1 /* LineAdded */;
                         }
                         break;
-                    case 2:
-                        if (rule.flags !== 1 && previousStartLine !== currentStartLine) {
-                            return 0;
+                    case 2 /* Space */:
+                        // exit early if we on different lines and rule cannot change number of newlines
+                        if (rule.flags !== 1 /* CanDeleteNewLines */ && previousStartLine !== currentStartLine) {
+                            return 0 /* None */;
                         }
                         var posDelta = currentRange.pos - previousRange.end;
-                        if (posDelta !== 1 || sourceFile.text.charCodeAt(previousRange.end) !== 32) {
+                        if (posDelta !== 1 || sourceFile.text.charCodeAt(previousRange.end) !== 32 /* space */) {
                             recordReplace(previousRange.end, currentRange.pos - previousRange.end, " ");
-                            return onLaterLine ? 2 : 0;
+                            return onLaterLine ? 2 /* LineRemoved */ : 0 /* None */;
                         }
                 }
-                return 0;
+                return 0 /* None */;
             }
         }
         var LineAction;
@@ -82319,8 +100066,12 @@ var ts;
             LineAction[LineAction["LineAdded"] = 1] = "LineAdded";
             LineAction[LineAction["LineRemoved"] = 2] = "LineRemoved";
         })(LineAction || (LineAction = {}));
-        function getRangeOfEnclosingComment(sourceFile, position, onlyMultiLine, precedingToken, tokenAtPosition, predicate) {
-            if (tokenAtPosition === void 0) { tokenAtPosition = ts.getTokenAtPosition(sourceFile, position, false); }
+        /**
+         * @param precedingToken pass `null` if preceding token was already computed and result was `undefined`.
+         */
+        function getRangeOfEnclosingComment(sourceFile, position, onlyMultiLine, precedingToken, // tslint:disable-line:no-null-keyword
+        tokenAtPosition, predicate) {
+            if (tokenAtPosition === void 0) { tokenAtPosition = ts.getTokenAtPosition(sourceFile, position, /*includeJsDocComment*/ false); }
             var tokenStart = tokenAtPosition.getStart(sourceFile);
             if (tokenStart <= position && position < tokenAtPosition.getEnd()) {
                 return undefined;
@@ -82328,6 +100079,8 @@ var ts;
             if (precedingToken === undefined) {
                 precedingToken = ts.findPrecedingToken(position, sourceFile);
             }
+            // Between two consecutive tokens, all comments are either trailing on the former
+            // or leading on the latter (and none are in both lists).
             var trailingRangesOfPreviousToken = precedingToken && ts.getTrailingCommentRanges(sourceFile.text, precedingToken.end);
             var leadingCommentRangesOfNextToken = ts.getLeadingCommentRangesOfNode(tokenAtPosition, sourceFile);
             var commentRanges = trailingRangesOfPreviousToken && leadingCommentRangesOfNextToken ?
@@ -82336,9 +100089,22 @@ var ts;
             if (commentRanges) {
                 for (var _i = 0, commentRanges_1 = commentRanges; _i < commentRanges_1.length; _i++) {
                     var range = commentRanges_1[_i];
+                    // The end marker of a single-line comment does not include the newline character.
+                    // With caret at `^`, in the following case, we are inside a comment (^ denotes the cursor position):
+                    //
+                    //    // asdf   ^\n
+                    //
+                    // But for closed multi-line comments, we don't want to be inside the comment in the following case:
+                    //
+                    //    /* asdf */^
+                    //
+                    // However, unterminated multi-line comments *do* contain their end.
+                    //
+                    // Internally, we represent the end of the comment at the newline and closing '/', respectively.
+                    //
                     if ((range.pos < position && position < range.end ||
-                        position === range.end && (range.kind === 2 || position === sourceFile.getFullWidth()))) {
-                        return (range.kind === 3 || !onlyMultiLine) && (!predicate || predicate(range)) ? range : undefined;
+                        position === range.end && (range.kind === 2 /* SingleLineCommentTrivia */ || position === sourceFile.getFullWidth()))) {
+                        return (range.kind === 3 /* MultiLineCommentTrivia */ || !onlyMultiLine) && (!predicate || predicate(range)) ? range : undefined;
                     }
                 }
             }
@@ -82347,48 +100113,49 @@ var ts;
         formatting.getRangeOfEnclosingComment = getRangeOfEnclosingComment;
         function getOpenTokenForList(node, list) {
             switch (node.kind) {
-                case 155:
-                case 234:
-                case 192:
-                case 154:
-                case 153:
-                case 193:
+                case 155 /* Constructor */:
+                case 234 /* FunctionDeclaration */:
+                case 192 /* FunctionExpression */:
+                case 154 /* MethodDeclaration */:
+                case 153 /* MethodSignature */:
+                case 193 /* ArrowFunction */:
                     if (node.typeParameters === list) {
-                        return 27;
+                        return 27 /* LessThanToken */;
                     }
                     else if (node.parameters === list) {
-                        return 19;
+                        return 19 /* OpenParenToken */;
                     }
                     break;
-                case 187:
-                case 188:
+                case 187 /* CallExpression */:
+                case 188 /* NewExpression */:
                     if (node.typeArguments === list) {
-                        return 27;
+                        return 27 /* LessThanToken */;
                     }
                     else if (node.arguments === list) {
-                        return 19;
+                        return 19 /* OpenParenToken */;
                     }
                     break;
-                case 162:
+                case 162 /* TypeReference */:
                     if (node.typeArguments === list) {
-                        return 27;
+                        return 27 /* LessThanToken */;
                     }
             }
-            return 0;
+            return 0 /* Unknown */;
         }
         function getCloseTokenForOpenToken(kind) {
             switch (kind) {
-                case 19:
-                    return 20;
-                case 27:
-                    return 29;
+                case 19 /* OpenParenToken */:
+                    return 20 /* CloseParenToken */;
+                case 27 /* LessThanToken */:
+                    return 29 /* GreaterThanToken */;
             }
-            return 0;
+            return 0 /* Unknown */;
         }
         var internedSizes;
         var internedTabsIndentation;
         var internedSpacesIndentation;
         function getIndentationString(indentation, options) {
+            // reset interned strings if FormatCodeOptions were changed
             var resetInternedStrings = !internedSizes || (internedSizes.tabSize !== options.tabSize || internedSizes.indentSize !== options.indentSize);
             if (resetInternedStrings) {
                 internedSizes = { tabSize: options.tabSize, indentSize: options.indentSize };
@@ -82429,6 +100196,7 @@ var ts;
         formatting.getIndentationString = getIndentationString;
     })(formatting = ts.formatting || (ts.formatting = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var formatting;
@@ -82439,33 +100207,55 @@ var ts;
             (function (Value) {
                 Value[Value["Unknown"] = -1] = "Unknown";
             })(Value || (Value = {}));
+            /**
+             * @param assumeNewLineBeforeCloseBrace
+             * `false` when called on text from a real source file.
+             * `true` when we need to assume `position` is on a newline.
+             *
+             * This is useful for codefixes. Consider
+             * ```
+             * function f() {
+             * |}
+             * ```
+             * with `position` at `|`.
+             *
+             * When inserting some text after an open brace, we would like to get indentation as if a newline was already there.
+             * By default indentation at `position` will be 0 so 'assumeNewLineBeforeCloseBrace' overrides this behavior.
+             */
             function getIndentation(position, sourceFile, options, assumeNewLineBeforeCloseBrace) {
                 if (assumeNewLineBeforeCloseBrace === void 0) { assumeNewLineBeforeCloseBrace = false; }
                 if (position > sourceFile.text.length) {
-                    return getBaseIndentation(options);
+                    return getBaseIndentation(options); // past EOF
                 }
+                // no indentation when the indent style is set to none,
+                // so we can return fast
                 if (options.indentStyle === ts.IndentStyle.None) {
                     return 0;
                 }
                 var precedingToken = ts.findPrecedingToken(position, sourceFile);
-                var enclosingCommentRange = formatting.getRangeOfEnclosingComment(sourceFile, position, true, precedingToken || null);
+                var enclosingCommentRange = formatting.getRangeOfEnclosingComment(sourceFile, position, /*onlyMultiLine*/ true, precedingToken || null); // tslint:disable-line:no-null-keyword
                 if (enclosingCommentRange) {
                     return getCommentIndent(sourceFile, position, options, enclosingCommentRange);
                 }
                 if (!precedingToken) {
                     return getBaseIndentation(options);
                 }
+                // no indentation in string \regex\template literals
                 var precedingTokenIsLiteral = ts.isStringOrRegularExpressionOrTemplateLiteral(precedingToken.kind);
                 if (precedingTokenIsLiteral && precedingToken.getStart(sourceFile) <= position && position < precedingToken.end) {
                     return 0;
                 }
                 var lineAtPosition = sourceFile.getLineAndCharacterOfPosition(position).line;
+                // indentation is first non-whitespace character in a previous line
+                // for block indentation, we should look for a line which contains something that's not
+                // whitespace.
                 if (options.indentStyle === ts.IndentStyle.Block) {
                     return getBlockIndent(sourceFile, position, options);
                 }
-                if (precedingToken.kind === 26 && precedingToken.parent.kind !== 200) {
+                if (precedingToken.kind === 26 /* CommaToken */ && precedingToken.parent.kind !== 200 /* BinaryExpression */) {
+                    // previous token is comma that separates items in list - find the previous item and try to derive indentation from it
                     var actualIndentation = getActualIndentationForListItemBeforeComma(precedingToken, sourceFile, options);
-                    if (actualIndentation !== -1) {
+                    if (actualIndentation !== -1 /* Unknown */) {
                         return actualIndentation;
                     }
                 }
@@ -82485,9 +100275,11 @@ var ts;
                     return column;
                 }
                 var firstNonWhitespaceCharacterCode = sourceFile.text.charCodeAt(startPostionOfLine + character);
-                return firstNonWhitespaceCharacterCode === 42 ? column - 1 : column;
+                return firstNonWhitespaceCharacterCode === 42 /* asterisk */ ? column - 1 : column;
             }
             function getBlockIndent(sourceFile, position, options) {
+                // move backwards until we find a line with a non-whitespace character,
+                // then find the first non-whitespace character for that line.
                 var current = position;
                 while (current > 0) {
                     var char = sourceFile.text.charCodeAt(current);
@@ -82500,33 +100292,38 @@ var ts;
                 return findFirstNonWhitespaceColumn(lineStart, current, sourceFile, options);
             }
             function getSmartIndent(sourceFile, position, precedingToken, lineAtPosition, assumeNewLineBeforeCloseBrace, options) {
+                // try to find node that can contribute to indentation and includes 'position' starting from 'precedingToken'
+                // if such node is found - compute initial indentation for 'position' inside this node
                 var previous;
                 var current = precedingToken;
                 while (current) {
-                    if (ts.positionBelongsToNode(current, position, sourceFile) && shouldIndentChildNode(options, current, previous, sourceFile, true)) {
+                    if (ts.positionBelongsToNode(current, position, sourceFile) && shouldIndentChildNode(options, current, previous, sourceFile, /*isNextChild*/ true)) {
                         var currentStart = getStartLineAndCharacterForNode(current, sourceFile);
                         var nextTokenKind = nextTokenIsCurlyBraceOnSameLineAsCursor(precedingToken, current, lineAtPosition, sourceFile);
-                        var indentationDelta = nextTokenKind !== 0
-                            ? assumeNewLineBeforeCloseBrace && nextTokenKind === 2 ? options.indentSize : 0
+                        var indentationDelta = nextTokenKind !== 0 /* Unknown */
+                            // handle cases when codefix is about to be inserted before the close brace
+                            ? assumeNewLineBeforeCloseBrace && nextTokenKind === 2 /* CloseBrace */ ? options.indentSize : 0
                             : lineAtPosition !== currentStart.line ? options.indentSize : 0;
-                        return getIndentationForNodeWorker(current, currentStart, undefined, indentationDelta, sourceFile, true, options);
+                        return getIndentationForNodeWorker(current, currentStart, /*ignoreActualIndentationRange*/ undefined, indentationDelta, sourceFile, /*isNextChild*/ true, options); // TODO: GH#18217
                     }
+                    // check if current node is a list item - if yes, take indentation from it
                     var actualIndentation = getActualIndentationForListItem(current, sourceFile, options);
-                    if (actualIndentation !== -1) {
+                    if (actualIndentation !== -1 /* Unknown */) {
                         return actualIndentation;
                     }
                     actualIndentation = getLineIndentationWhenExpressionIsInMultiLine(current, sourceFile, options);
-                    if (actualIndentation !== -1) {
-                        return actualIndentation + options.indentSize;
+                    if (actualIndentation !== -1 /* Unknown */) {
+                        return actualIndentation + options.indentSize; // TODO: GH#18217
                     }
                     previous = current;
                     current = current.parent;
                 }
+                // no parent was found - return the base indentation of the SourceFile
                 return getBaseIndentation(options);
             }
             function getIndentationForNode(n, ignoreActualIndentationRange, sourceFile, options) {
                 var start = sourceFile.getLineAndCharacterOfPosition(n.getStart(sourceFile));
-                return getIndentationForNodeWorker(n, start, ignoreActualIndentationRange, 0, sourceFile, false, options);
+                return getIndentationForNodeWorker(n, start, ignoreActualIndentationRange, /*indentationDelta*/ 0, sourceFile, /*isNextChild*/ false, options);
             }
             SmartIndenter.getIndentationForNode = getIndentationForNode;
             function getBaseIndentation(options) {
@@ -82535,6 +100332,9 @@ var ts;
             SmartIndenter.getBaseIndentation = getBaseIndentation;
             function getIndentationForNodeWorker(current, currentStart, ignoreActualIndentationRange, indentationDelta, sourceFile, isNextChild, options) {
                 var parent = current.parent;
+                // Walk up the tree and collect indentation for parent-child node pairs. Indentation is not added if
+                // * parent and child nodes start on the same line, or
+                // * parent is an IfStatement and child starts on the same line as an 'else clause'.
                 while (parent) {
                     var useActualIndentation = true;
                     if (ignoreActualIndentationRange) {
@@ -82542,8 +100342,9 @@ var ts;
                         useActualIndentation = start < ignoreActualIndentationRange.pos || start > ignoreActualIndentationRange.end;
                     }
                     if (useActualIndentation) {
+                        // check if current node is a list item - if yes, take indentation from it
                         var actualIndentation = getActualIndentationForListItem(current, sourceFile, options);
-                        if (actualIndentation !== -1) {
+                        if (actualIndentation !== -1 /* Unknown */) {
                             return actualIndentation + indentationDelta;
                         }
                     }
@@ -82551,18 +100352,28 @@ var ts;
                     var parentAndChildShareLine = containingListOrParentStart.line === currentStart.line ||
                         childStartsOnTheSameLineWithElseInIfStatement(parent, current, currentStart.line, sourceFile);
                     if (useActualIndentation) {
+                        // try to fetch actual indentation for current node from source text
                         var actualIndentation = getActualIndentationForNode(current, parent, currentStart, parentAndChildShareLine, sourceFile, options);
-                        if (actualIndentation !== -1) {
+                        if (actualIndentation !== -1 /* Unknown */) {
                             return actualIndentation + indentationDelta;
                         }
                         actualIndentation = getLineIndentationWhenExpressionIsInMultiLine(current, sourceFile, options);
-                        if (actualIndentation !== -1) {
+                        if (actualIndentation !== -1 /* Unknown */) {
                             return actualIndentation + indentationDelta;
                         }
                     }
+                    // increase indentation if parent node wants its content to be indented and parent and child nodes don't start on the same line
                     if (shouldIndentChildNode(options, parent, current, sourceFile, isNextChild) && !parentAndChildShareLine) {
                         indentationDelta += options.indentSize;
                     }
+                    // In our AST, a call argument's `parent` is the call-expression, not the argument list.
+                    // We would like to increase indentation based on the relationship between an argument and its argument-list,
+                    // so we spoof the starting position of the (parent) call-expression to match the (non-parent) argument-list.
+                    // But, the spoofed start-value could then cause a problem when comparing the start position of the call-expression
+                    // to *its* parent (in the case of an iife, an expression statement), adding an extra level of indentation.
+                    //
+                    // Instead, when at an argument, we unspoof the starting position of the enclosing call expression
+                    // *after* applying indentation for the argument.
                     var useTrueStart = isArgumentAndStartLineOverlapsExpressionBeingCalled(parent, current, currentStart.line, sourceFile);
                     current = parent;
                     parent = current.parent;
@@ -82575,20 +100386,31 @@ var ts;
                 var startPos = containingList ? containingList.pos : parent.getStart(sourceFile);
                 return sourceFile.getLineAndCharacterOfPosition(startPos);
             }
+            /*
+             * Function returns Value.Unknown if indentation cannot be determined
+             */
             function getActualIndentationForListItemBeforeComma(commaToken, sourceFile, options) {
+                // previous token is comma that separates items in list - find the previous item and try to derive indentation from it
                 var commaItemInfo = ts.findListItemInfo(commaToken);
                 if (commaItemInfo && commaItemInfo.listItemIndex > 0) {
                     return deriveActualIndentationFromList(commaItemInfo.list.getChildren(), commaItemInfo.listItemIndex - 1, sourceFile, options);
                 }
                 else {
-                    return -1;
+                    // handle broken code gracefully
+                    return -1 /* Unknown */;
                 }
             }
+            /*
+             * Function returns Value.Unknown if actual indentation for node should not be used (i.e because node is nested expression)
+             */
             function getActualIndentationForNode(current, parent, currentLineAndChar, parentAndChildShareLine, sourceFile, options) {
+                // actual indentation is used for statements\declarations if one of cases below is true:
+                // - parent is SourceFile - by default immediate children of SourceFile are not indented except when user indents them manually
+                // - parent and child are not on the same line
                 var useActualIndentation = (ts.isDeclaration(current) || ts.isStatementButNotDeclaration(current)) &&
-                    (parent.kind === 274 || !parentAndChildShareLine);
+                    (parent.kind === 274 /* SourceFile */ || !parentAndChildShareLine);
                 if (!useActualIndentation) {
-                    return -1;
+                    return -1 /* Unknown */;
                 }
                 return findColumnForFirstNonWhitespaceCharacterInLine(currentLineAndChar, sourceFile, options);
             }
@@ -82601,16 +100423,25 @@ var ts;
             function nextTokenIsCurlyBraceOnSameLineAsCursor(precedingToken, current, lineAtPosition, sourceFile) {
                 var nextToken = ts.findNextToken(precedingToken, current, sourceFile);
                 if (!nextToken) {
-                    return 0;
+                    return 0 /* Unknown */;
                 }
-                if (nextToken.kind === 17) {
-                    return 1;
+                if (nextToken.kind === 17 /* OpenBraceToken */) {
+                    // open braces are always indented at the parent level
+                    return 1 /* OpenBrace */;
                 }
-                else if (nextToken.kind === 18) {
+                else if (nextToken.kind === 18 /* CloseBraceToken */) {
+                    // close braces are indented at the parent level if they are located on the same line with cursor
+                    // this means that if new line will be added at $ position, this case will be indented
+                    // class A {
+                    //    $
+                    // }
+                    /// and this one - not
+                    // class A {
+                    // $}
                     var nextTokenStartLine = getStartLineAndCharacterForNode(nextToken, sourceFile).line;
-                    return lineAtPosition === nextTokenStartLine ? 2 : 0;
+                    return lineAtPosition === nextTokenStartLine ? 2 /* CloseBrace */ : 0 /* Unknown */;
                 }
-                return 0;
+                return 0 /* Unknown */;
             }
             function getStartLineAndCharacterForNode(n, sourceFile) {
                 return sourceFile.getLineAndCharacterOfPosition(n.getStart(sourceFile));
@@ -82625,8 +100456,8 @@ var ts;
             }
             SmartIndenter.isArgumentAndStartLineOverlapsExpressionBeingCalled = isArgumentAndStartLineOverlapsExpressionBeingCalled;
             function childStartsOnTheSameLineWithElseInIfStatement(parent, child, childStartLine, sourceFile) {
-                if (parent.kind === 217 && parent.elseStatement === child) {
-                    var elseKeyword = ts.findChildOfKind(parent, 82, sourceFile);
+                if (parent.kind === 217 /* IfStatement */ && parent.elseStatement === child) {
+                    var elseKeyword = ts.findChildOfKind(parent, 82 /* ElseKeyword */, sourceFile);
                     ts.Debug.assert(elseKeyword !== undefined);
                     var elseKeywordStartLine = getStartLineAndCharacterForNode(elseKeyword, sourceFile).line;
                     return elseKeywordStartLine === childStartLine;
@@ -82641,40 +100472,40 @@ var ts;
                 if (node.parent) {
                     var end = node.end;
                     switch (node.parent.kind) {
-                        case 162:
+                        case 162 /* TypeReference */:
                             return getListIfStartEndIsInListRange(node.parent.typeArguments, node.getStart(sourceFile), end);
-                        case 184:
+                        case 184 /* ObjectLiteralExpression */:
                             return node.parent.properties;
-                        case 183:
+                        case 183 /* ArrayLiteralExpression */:
                             return node.parent.elements;
-                        case 234:
-                        case 192:
-                        case 193:
-                        case 154:
-                        case 153:
-                        case 158:
-                        case 155:
-                        case 164:
-                        case 159: {
+                        case 234 /* FunctionDeclaration */:
+                        case 192 /* FunctionExpression */:
+                        case 193 /* ArrowFunction */:
+                        case 154 /* MethodDeclaration */:
+                        case 153 /* MethodSignature */:
+                        case 158 /* CallSignature */:
+                        case 155 /* Constructor */:
+                        case 164 /* ConstructorType */:
+                        case 159 /* ConstructSignature */: {
                             var start = node.getStart(sourceFile);
                             return getListIfStartEndIsInListRange(node.parent.typeParameters, start, end) ||
                                 getListIfStartEndIsInListRange(node.parent.parameters, start, end);
                         }
-                        case 235:
+                        case 235 /* ClassDeclaration */:
                             return getListIfStartEndIsInListRange(node.parent.typeParameters, node.getStart(sourceFile), end);
-                        case 188:
-                        case 187: {
+                        case 188 /* NewExpression */:
+                        case 187 /* CallExpression */: {
                             var start = node.getStart(sourceFile);
                             return getListIfStartEndIsInListRange(node.parent.typeArguments, start, end) ||
                                 getListIfStartEndIsInListRange(node.parent.arguments, start, end);
                         }
-                        case 233:
+                        case 233 /* VariableDeclarationList */:
                             return getListIfStartEndIsInListRange(node.parent.declarations, node.getStart(sourceFile), end);
-                        case 247:
-                        case 251:
+                        case 247 /* NamedImports */:
+                        case 251 /* NamedExports */:
                             return getListIfStartEndIsInListRange(node.parent.elements, node.getStart(sourceFile), end);
-                        case 180:
-                        case 181:
+                        case 180 /* ObjectBindingPattern */:
+                        case 181 /* ArrayBindingPattern */:
                             return getListIfStartEndIsInListRange(node.parent.elements, node.getStart(sourceFile), end);
                     }
                 }
@@ -82689,33 +100520,35 @@ var ts;
                         return deriveActualIndentationFromList(containingList, index, sourceFile, options);
                     }
                 }
-                return -1;
+                return -1 /* Unknown */;
             }
             function getLineIndentationWhenExpressionIsInMultiLine(node, sourceFile, options) {
-                if (node.kind === 20) {
-                    return -1;
+                // actual indentation should not be used when:
+                // - node is close parenthesis - this is the end of the expression
+                if (node.kind === 20 /* CloseParenToken */) {
+                    return -1 /* Unknown */;
                 }
                 if (node.parent && ts.isCallOrNewExpression(node.parent) && node.parent.expression !== node) {
                     var fullCallOrNewExpression = node.parent.expression;
                     var startingExpression = getStartingExpression(fullCallOrNewExpression);
                     if (fullCallOrNewExpression === startingExpression) {
-                        return -1;
+                        return -1 /* Unknown */;
                     }
                     var fullCallOrNewExpressionEnd = sourceFile.getLineAndCharacterOfPosition(fullCallOrNewExpression.end);
                     var startingExpressionEnd = sourceFile.getLineAndCharacterOfPosition(startingExpression.end);
                     if (fullCallOrNewExpressionEnd.line === startingExpressionEnd.line) {
-                        return -1;
+                        return -1 /* Unknown */;
                     }
                     return findColumnForFirstNonWhitespaceCharacterInLine(fullCallOrNewExpressionEnd, sourceFile, options);
                 }
-                return -1;
+                return -1 /* Unknown */;
                 function getStartingExpression(node) {
                     while (true) {
                         switch (node.kind) {
-                            case 187:
-                            case 188:
-                            case 185:
-                            case 186:
+                            case 187 /* CallExpression */:
+                            case 188 /* NewExpression */:
+                            case 185 /* PropertyAccessExpression */:
+                            case 186 /* ElementAccessExpression */:
                                 node = node.expression;
                                 break;
                             default:
@@ -82727,23 +100560,33 @@ var ts;
             function deriveActualIndentationFromList(list, index, sourceFile, options) {
                 ts.Debug.assert(index >= 0 && index < list.length);
                 var node = list[index];
+                // walk toward the start of the list starting from current node and check if the line is the same for all items.
+                // if end line for item [i - 1] differs from the start line for item [i] - find column of the first non-whitespace character on the line of item [i]
                 var lineAndCharacter = getStartLineAndCharacterForNode(node, sourceFile);
                 for (var i = index - 1; i >= 0; i--) {
-                    if (list[i].kind === 26) {
+                    if (list[i].kind === 26 /* CommaToken */) {
                         continue;
                     }
+                    // skip list items that ends on the same line with the current list element
                     var prevEndLine = sourceFile.getLineAndCharacterOfPosition(list[i].end).line;
                     if (prevEndLine !== lineAndCharacter.line) {
                         return findColumnForFirstNonWhitespaceCharacterInLine(lineAndCharacter, sourceFile, options);
                     }
                     lineAndCharacter = getStartLineAndCharacterForNode(list[i], sourceFile);
                 }
-                return -1;
+                return -1 /* Unknown */;
             }
             function findColumnForFirstNonWhitespaceCharacterInLine(lineAndCharacter, sourceFile, options) {
                 var lineStart = sourceFile.getPositionOfLineAndCharacter(lineAndCharacter.line, 0);
                 return findFirstNonWhitespaceColumn(lineStart, lineStart + lineAndCharacter.character, sourceFile, options);
             }
+            /**
+             * Character is the actual index of the character since the beginning of the line.
+             * Column - position of the character after expanding tabs to spaces.
+             * "0\t2$"
+             * value of 'character' for '$' is 3
+             * value of 'column' for '$' is 6 (assuming that tab size is 4)
+             */
             function findFirstNonWhitespaceCharacterAndColumn(startPos, endPos, sourceFile, options) {
                 var character = 0;
                 var column = 0;
@@ -82752,7 +100595,7 @@ var ts;
                     if (!ts.isWhiteSpaceSingleLine(ch)) {
                         break;
                     }
-                    if (ch === 9) {
+                    if (ch === 9 /* tab */) {
                         column += options.tabSize + (column % options.tabSize);
                     }
                     else {
@@ -82768,111 +100611,118 @@ var ts;
             }
             SmartIndenter.findFirstNonWhitespaceColumn = findFirstNonWhitespaceColumn;
             function nodeWillIndentChild(settings, parent, child, sourceFile, indentByDefault) {
-                var childKind = child ? child.kind : 0;
+                var childKind = child ? child.kind : 0 /* Unknown */;
                 switch (parent.kind) {
-                    case 216:
-                    case 235:
-                    case 205:
-                    case 236:
-                    case 238:
-                    case 237:
-                    case 183:
-                    case 213:
-                    case 240:
-                    case 184:
-                    case 166:
-                    case 177:
-                    case 168:
-                    case 241:
-                    case 267:
-                    case 266:
-                    case 191:
-                    case 185:
-                    case 187:
-                    case 188:
-                    case 214:
-                    case 249:
-                    case 225:
-                    case 201:
-                    case 181:
-                    case 180:
-                    case 257:
-                    case 260:
-                    case 256:
-                    case 265:
-                    case 153:
-                    case 158:
-                    case 159:
-                    case 149:
-                    case 163:
-                    case 164:
-                    case 173:
-                    case 189:
-                    case 197:
-                    case 251:
-                    case 247:
-                    case 252:
-                    case 248:
-                    case 152:
+                    case 216 /* ExpressionStatement */:
+                    case 235 /* ClassDeclaration */:
+                    case 205 /* ClassExpression */:
+                    case 236 /* InterfaceDeclaration */:
+                    case 238 /* EnumDeclaration */:
+                    case 237 /* TypeAliasDeclaration */:
+                    case 183 /* ArrayLiteralExpression */:
+                    case 213 /* Block */:
+                    case 240 /* ModuleBlock */:
+                    case 184 /* ObjectLiteralExpression */:
+                    case 166 /* TypeLiteral */:
+                    case 177 /* MappedType */:
+                    case 168 /* TupleType */:
+                    case 241 /* CaseBlock */:
+                    case 267 /* DefaultClause */:
+                    case 266 /* CaseClause */:
+                    case 191 /* ParenthesizedExpression */:
+                    case 185 /* PropertyAccessExpression */:
+                    case 187 /* CallExpression */:
+                    case 188 /* NewExpression */:
+                    case 214 /* VariableStatement */:
+                    case 249 /* ExportAssignment */:
+                    case 225 /* ReturnStatement */:
+                    case 201 /* ConditionalExpression */:
+                    case 181 /* ArrayBindingPattern */:
+                    case 180 /* ObjectBindingPattern */:
+                    case 257 /* JsxOpeningElement */:
+                    case 260 /* JsxOpeningFragment */:
+                    case 256 /* JsxSelfClosingElement */:
+                    case 265 /* JsxExpression */:
+                    case 153 /* MethodSignature */:
+                    case 158 /* CallSignature */:
+                    case 159 /* ConstructSignature */:
+                    case 149 /* Parameter */:
+                    case 163 /* FunctionType */:
+                    case 164 /* ConstructorType */:
+                    case 173 /* ParenthesizedType */:
+                    case 189 /* TaggedTemplateExpression */:
+                    case 197 /* AwaitExpression */:
+                    case 251 /* NamedExports */:
+                    case 247 /* NamedImports */:
+                    case 252 /* ExportSpecifier */:
+                    case 248 /* ImportSpecifier */:
+                    case 152 /* PropertyDeclaration */:
                         return true;
-                    case 232:
-                    case 270:
-                        if (!settings.indentMultiLineObjectLiteralBeginningOnBlankLine && sourceFile && childKind === 184) {
+                    case 232 /* VariableDeclaration */:
+                    case 270 /* PropertyAssignment */:
+                        if (!settings.indentMultiLineObjectLiteralBeginningOnBlankLine && sourceFile && childKind === 184 /* ObjectLiteralExpression */) { // TODO: GH#18217
                             return rangeIsOnOneLine(sourceFile, child);
                         }
                         return true;
-                    case 218:
-                    case 219:
-                    case 221:
-                    case 222:
-                    case 220:
-                    case 217:
-                    case 234:
-                    case 192:
-                    case 154:
-                    case 193:
-                    case 155:
-                    case 156:
-                    case 157:
-                        return childKind !== 213;
-                    case 250:
-                        return childKind !== 251;
-                    case 244:
-                        return childKind !== 245 ||
-                            (!!child.namedBindings && child.namedBindings.kind !== 247);
-                    case 255:
-                        return childKind !== 258;
-                    case 259:
-                        return childKind !== 261;
-                    case 170:
-                    case 169:
-                        if (childKind === 166) {
+                    case 218 /* DoStatement */:
+                    case 219 /* WhileStatement */:
+                    case 221 /* ForInStatement */:
+                    case 222 /* ForOfStatement */:
+                    case 220 /* ForStatement */:
+                    case 217 /* IfStatement */:
+                    case 234 /* FunctionDeclaration */:
+                    case 192 /* FunctionExpression */:
+                    case 154 /* MethodDeclaration */:
+                    case 193 /* ArrowFunction */:
+                    case 155 /* Constructor */:
+                    case 156 /* GetAccessor */:
+                    case 157 /* SetAccessor */:
+                        return childKind !== 213 /* Block */;
+                    case 250 /* ExportDeclaration */:
+                        return childKind !== 251 /* NamedExports */;
+                    case 244 /* ImportDeclaration */:
+                        return childKind !== 245 /* ImportClause */ ||
+                            (!!child.namedBindings && child.namedBindings.kind !== 247 /* NamedImports */);
+                    case 255 /* JsxElement */:
+                        return childKind !== 258 /* JsxClosingElement */;
+                    case 259 /* JsxFragment */:
+                        return childKind !== 261 /* JsxClosingFragment */;
+                    case 170 /* IntersectionType */:
+                    case 169 /* UnionType */:
+                        if (childKind === 166 /* TypeLiteral */) {
                             return false;
                         }
+                    // falls through
                 }
+                // No explicit rule for given nodes so the result will follow the default value argument
                 return indentByDefault;
             }
             SmartIndenter.nodeWillIndentChild = nodeWillIndentChild;
             function isControlFlowEndingStatement(kind, parent) {
                 switch (kind) {
-                    case 225:
-                    case 229: {
-                        if (parent.kind !== 213) {
+                    case 225 /* ReturnStatement */:
+                    case 229 /* ThrowStatement */: {
+                        if (parent.kind !== 213 /* Block */) {
                             return true;
                         }
                         var grandParent = parent.parent;
-                        return !(grandParent && grandParent.kind === 192 || grandParent.kind === 234);
+                        // In a function, we may want to write inner functions after this.
+                        return !(grandParent && grandParent.kind === 192 /* FunctionExpression */ || grandParent.kind === 234 /* FunctionDeclaration */);
                     }
-                    case 223:
-                    case 224:
+                    case 223 /* ContinueStatement */:
+                    case 224 /* BreakStatement */:
                         return true;
                     default:
                         return false;
                 }
             }
+            /**
+             * True when the parent node should indent the given child by an explicit rule.
+             * @param isNextChild If true, we are judging indent of a hypothetical child *after* this one, not the current child.
+             */
             function shouldIndentChildNode(settings, parent, child, sourceFile, isNextChild) {
                 if (isNextChild === void 0) { isNextChild = false; }
-                return nodeWillIndentChild(settings, parent, child, sourceFile, false)
+                return nodeWillIndentChild(settings, parent, child, sourceFile, /*indentByDefault*/ false)
                     && !(isNextChild && child && isControlFlowEndingStatement(child.kind, parent));
             }
             SmartIndenter.shouldIndentChildNode = shouldIndentChildNode;
@@ -82885,10 +100735,15 @@ var ts;
         })(SmartIndenter = formatting.SmartIndenter || (formatting.SmartIndenter = {}));
     })(formatting = ts.formatting || (ts.formatting = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var textChanges;
     (function (textChanges_3) {
+        /**
+         * Currently for simplicity we store recovered positions on the node itself.
+         * It can be changed to side-table later if we decide that current design is too invasive.
+         */
         function getPos(n) {
             var result = n.__pos;
             ts.Debug.assert(typeof result === "number");
@@ -82913,7 +100768,7 @@ var ts;
             Position[Position["Start"] = 1] = "Start";
         })(Position = textChanges_3.Position || (textChanges_3.Position = {}));
         function skipWhitespacesAndLineBreaks(text, start) {
-            return ts.skipTrivia(text, start, false, true);
+            return ts.skipTrivia(text, start, /*stopAfterLineBreak*/ false, /*stopAtComments*/ true);
         }
         function hasCommentsBeforeLineBreak(text, start) {
             var i = start;
@@ -82923,7 +100778,7 @@ var ts;
                     i++;
                     continue;
                 }
-                return ch === 47;
+                return ch === 47 /* slash */;
             }
             return false;
         }
@@ -82953,10 +100808,20 @@ var ts;
             var fullStartLine = ts.getLineStartPositionForPosition(fullStart, sourceFile);
             var startLine = ts.getLineStartPositionForPosition(start, sourceFile);
             if (startLine === fullStartLine) {
+                // full start and start of the node are on the same line
+                //   a,     b;
+                //    ^     ^
+                //    |   start
+                // fullstart
+                // when b is replaced - we usually want to keep the leading trvia
+                // when b is deleted - we delete it
                 return position === Position.Start ? start : fullStart;
             }
+            // get start position of the line following the line that contains fullstart position
+            // (but only if the fullstart isn't the very beginning of the file)
             var nextLineStart = fullStart > 0 ? 1 : 0;
             var adjustedStartPosition = ts.getStartPositionOfLine(ts.getLineOfLocalPosition(sourceFile, fullStartLine) + nextLineStart, sourceFile);
+            // skip whitespaces/newlines
             adjustedStartPosition = skipWhitespacesAndLineBreaks(sourceFile.text, adjustedStartPosition);
             return ts.getStartPositionOfLine(ts.getLineOfLocalPosition(sourceFile, adjustedStartPosition), sourceFile);
         }
@@ -82965,13 +100830,16 @@ var ts;
             if (options.useNonAdjustedEndPosition || ts.isExpression(node)) {
                 return end;
             }
-            var newEnd = ts.skipTrivia(sourceFile.text, end, true);
+            var newEnd = ts.skipTrivia(sourceFile.text, end, /*stopAfterLineBreak*/ true);
             return newEnd !== end && ts.isLineBreak(sourceFile.text.charCodeAt(newEnd - 1))
                 ? newEnd
                 : end;
         }
+        /**
+         * Checks if 'candidate' argument is a legal separator in the list that contains 'node' as an element
+         */
         function isSeparator(node, candidate) {
-            return !!candidate && !!node.parent && (candidate.kind === 26 || (candidate.kind === 25 && node.parent.kind === 184));
+            return !!candidate && !!node.parent && (candidate.kind === 26 /* CommaToken */ || (candidate.kind === 25 /* SemicolonToken */ && node.parent.kind === 184 /* ObjectLiteralExpression */));
         }
         function spaces(count) {
             var s = "";
@@ -82980,14 +100848,15 @@ var ts;
             }
             return s;
         }
-        var ChangeTracker = (function () {
+        var ChangeTracker = /** @class */ (function () {
+            /** Public for tests only. Other callers should use `ChangeTracker.with`. */
             function ChangeTracker(newLineCharacter, formatContext) {
                 this.newLineCharacter = newLineCharacter;
                 this.formatContext = formatContext;
                 this.changes = [];
                 this.newFiles = [];
-                this.deletedNodesInLists = new ts.NodeSet();
-                this.classesWithNodesInsertedAtStart = ts.createMap();
+                this.deletedNodesInLists = new ts.NodeSet(); // Stores ids of nodes in lists that we already deleted. Used to avoid deleting `, ` twice in `a, b`.
+                this.classesWithNodesInsertedAtStart = ts.createMap(); // Set<ClassDeclaration> implemented as Map<node id, ClassDeclaration>
             }
             ChangeTracker.fromContext = function (context) {
                 return new ChangeTracker(ts.getNewLineOrDefaultFromHost(context.host, context.formatContext.options), context.formatContext);
@@ -83001,6 +100870,7 @@ var ts;
                 this.changes.push({ kind: ChangeKind.Remove, sourceFile: sourceFile, range: range });
                 return this;
             };
+            /** Warning: This deletes comments too. See `copyComments` in `convertFunctionToEs6Class`. */
             ChangeTracker.prototype.deleteNode = function (sourceFile, node, options) {
                 if (options === void 0) { options = {}; }
                 var startPosition = getAdjustedStartPosition(sourceFile, node, options, Position.FullStart);
@@ -83035,6 +100905,8 @@ var ts;
                     this.deleteNode(sourceFile, node);
                     return this;
                 }
+                // Note: We will only delete a comma *after* a node. This will leave a trailing comma if we delete the last node.
+                // That's handled in the end by `finishTrailingCommaAfterDeletingNodesInList`.
                 ts.Debug.assert(!this.deletedNodesInLists.has(node), "Deleting a node twice");
                 this.deletedNodesInLists.add(node);
                 this.deleteRange(sourceFile, {
@@ -83071,7 +100943,7 @@ var ts;
             };
             ChangeTracker.prototype.nextCommaToken = function (sourceFile, node) {
                 var next = ts.findNextToken(node, node.parent, sourceFile);
-                return next && next.kind === 26 ? next : undefined;
+                return next && next.kind === 26 /* CommaToken */ ? next : undefined;
             };
             ChangeTracker.prototype.replacePropertyAssignment = function (sourceFile, oldNode, newNode) {
                 var suffix = this.nextCommaToken(sourceFile, oldNode) ? "" : ("," + this.newLineCharacter);
@@ -83103,8 +100975,12 @@ var ts;
             ChangeTracker.prototype.insertCommentBeforeLine = function (sourceFile, lineNumber, position, commentText) {
                 var lineStartPosition = ts.getStartPositionOfLine(lineNumber, sourceFile);
                 var startPosition = ts.getFirstNonSpaceCharacterPosition(sourceFile.text, lineStartPosition);
+                // First try to see if we can put the comment on the previous line.
+                // We need to make sure that we are not in the middle of a string literal or a comment.
+                // If so, we do not want to separate the node from its comment if we can.
+                // Otherwise, add an extra new line immediately before the error span.
                 var insertAtLineStart = isValidLocationToAddComment(sourceFile, startPosition);
-                var token = ts.getTouchingToken(sourceFile, insertAtLineStart ? startPosition : position, false);
+                var token = ts.getTouchingToken(sourceFile, insertAtLineStart ? startPosition : position, /*includeJsDocComment*/ false);
                 var indent = sourceFile.text.slice(lineStartPosition, startPosition);
                 var text = (insertAtLineStart ? "" : this.newLineCharacter) + "//" + commentText + this.newLineCharacter + indent;
                 this.insertText(sourceFile, token.getStart(sourceFile), text);
@@ -83115,36 +100991,39 @@ var ts;
             ChangeTracker.prototype.insertText = function (sourceFile, pos, text) {
                 this.replaceRangeWithText(sourceFile, ts.createTextRange(pos), text);
             };
+            /** Prefer this over replacing a node with another that has a type annotation, as it avoids reformatting the other parts of the node. */
             ChangeTracker.prototype.tryInsertTypeAnnotation = function (sourceFile, node, type) {
                 var endNode;
                 if (ts.isFunctionLike(node)) {
-                    endNode = ts.findChildOfKind(node, 20, sourceFile);
+                    endNode = ts.findChildOfKind(node, 20 /* CloseParenToken */, sourceFile);
                     if (!endNode) {
                         if (!ts.isArrowFunction(node))
-                            return;
+                            return; // Function missing parentheses, give up
+                        // If no `)`, is an arrow function `x => x`, so use the end of the first parameter
                         endNode = ts.first(node.parameters);
                     }
                 }
                 else {
-                    endNode = node.kind !== 232 && node.questionToken ? node.questionToken : node.name;
+                    endNode = node.kind !== 232 /* VariableDeclaration */ && node.questionToken ? node.questionToken : node.name;
                 }
                 this.insertNodeAt(sourceFile, endNode.end, type, { prefix: ": " });
             };
             ChangeTracker.prototype.insertTypeParameters = function (sourceFile, node, typeParameters) {
-                var start = (ts.findChildOfKind(node, 19, sourceFile) || ts.first(node.parameters)).getStart(sourceFile);
+                // If no `(`, is an arrow function `x => x`, so use the pos of the first parameter
+                var start = (ts.findChildOfKind(node, 19 /* OpenParenToken */, sourceFile) || ts.first(node.parameters)).getStart(sourceFile);
                 this.insertNodesAt(sourceFile, start, typeParameters, { prefix: "<", suffix: ">" });
             };
             ChangeTracker.prototype.getOptionsForInsertNodeBefore = function (before, doubleNewlines) {
                 if (ts.isStatement(before) || ts.isClassElement(before)) {
                     return { suffix: doubleNewlines ? this.newLineCharacter + this.newLineCharacter : this.newLineCharacter };
                 }
-                else if (ts.isVariableDeclaration(before)) {
+                else if (ts.isVariableDeclaration(before)) { // insert `x = 1, ` into `const x = 1, y = 2;
                     return { suffix: ", " };
                 }
                 else if (ts.isParameter(before)) {
                     return {};
                 }
-                return ts.Debug.failBadSyntaxKind(before);
+                return ts.Debug.failBadSyntaxKind(before); // We haven't handled this kind of node yet -- add it
             };
             ChangeTracker.prototype.insertNodeAtConstructorStart = function (sourceFile, ctr, newStatement) {
                 var firstStatement = ts.firstOrUndefined(ctr.body.statements);
@@ -83165,7 +101044,7 @@ var ts;
                 }
             };
             ChangeTracker.prototype.replaceConstructorBody = function (sourceFile, ctr, statements) {
-                this.replaceNode(sourceFile, ctr.body, ts.createBlock(statements, true));
+                this.replaceNode(sourceFile, ctr.body, ts.createBlock(statements, /*multiLine*/ true));
             };
             ChangeTracker.prototype.insertNodeAtEndOfScope = function (sourceFile, scope, newNode) {
                 var pos = getAdjustedStartPosition(sourceFile, scope.getLastToken(), {}, Position.Start);
@@ -83183,7 +101062,8 @@ var ts;
             ChangeTracker.prototype.getInsertNodeAtClassStartPrefixSuffix = function (sourceFile, cls) {
                 if (cls.members.length === 0) {
                     if (ts.addToSeen(this.classesWithNodesInsertedAtStart, ts.getNodeId(cls), cls)) {
-                        var shouldSuffix = ts.positionsAreOnSameLine.apply(void 0, getClassBraceEnds(cls, sourceFile).concat([sourceFile]));
+                        // For `class C {\n}`, don't add the trailing "\n"
+                        var shouldSuffix = ts.positionsAreOnSameLine.apply(void 0, getClassBraceEnds(cls, sourceFile).concat([sourceFile])); // TODO: GH#4130 remove 'as any'
                         return { prefix: this.newLineCharacter, suffix: shouldSuffix ? this.newLineCharacter : "" };
                     }
                     else {
@@ -83208,8 +101088,10 @@ var ts;
             };
             ChangeTracker.prototype.insertNodeAfterWorker = function (sourceFile, after, newNode) {
                 if (needSemicolonBetween(after, newNode)) {
-                    if (sourceFile.text.charCodeAt(after.end - 1) !== 59) {
-                        this.replaceRange(sourceFile, ts.createTextRange(after.end), ts.createToken(25));
+                    // check if previous statement ends with semicolon
+                    // if not - insert semicolon to preserve the code from changing the meaning due to ASI
+                    if (sourceFile.text.charCodeAt(after.end - 1) !== 59 /* semicolon */) {
+                        this.replaceRange(sourceFile, ts.createTextRange(after.end), ts.createToken(25 /* SemicolonToken */));
                     }
                 }
                 var endPosition = getAdjustedEndPosition(sourceFile, after, {});
@@ -83235,34 +101117,43 @@ var ts;
                 else if (ts.isParameter(node)) {
                     return {};
                 }
-                return ts.Debug.failBadSyntaxKind(node);
+                return ts.Debug.failBadSyntaxKind(node); // We haven't handled this kind of node yet -- add it
             };
             ChangeTracker.prototype.insertName = function (sourceFile, node, name) {
                 ts.Debug.assert(!node.name);
-                if (node.kind === 193) {
-                    var arrow = ts.findChildOfKind(node, 36, sourceFile);
-                    var lparen = ts.findChildOfKind(node, 19, sourceFile);
+                if (node.kind === 193 /* ArrowFunction */) {
+                    var arrow = ts.findChildOfKind(node, 36 /* EqualsGreaterThanToken */, sourceFile);
+                    var lparen = ts.findChildOfKind(node, 19 /* OpenParenToken */, sourceFile);
                     if (lparen) {
-                        this.insertNodesAt(sourceFile, lparen.getStart(sourceFile), [ts.createToken(89), ts.createIdentifier(name)], { joiner: " " });
+                        // `() => {}` --> `function f() {}`
+                        this.insertNodesAt(sourceFile, lparen.getStart(sourceFile), [ts.createToken(89 /* FunctionKeyword */), ts.createIdentifier(name)], { joiner: " " });
                         this.deleteNode(sourceFile, arrow);
                     }
                     else {
+                        // `x => {}` -> `function f(x) {}`
                         this.insertText(sourceFile, ts.first(node.parameters).getStart(sourceFile), "function " + name + "(");
-                        this.replaceRange(sourceFile, arrow, ts.createToken(20));
+                        // Replacing full range of arrow to get rid of the leading space -- replace ` =>` with `)`
+                        this.replaceRange(sourceFile, arrow, ts.createToken(20 /* CloseParenToken */));
                     }
-                    if (node.body.kind !== 213) {
-                        this.insertNodesAt(sourceFile, node.body.getStart(sourceFile), [ts.createToken(17), ts.createToken(96)], { joiner: " ", suffix: " " });
-                        this.insertNodesAt(sourceFile, node.body.end, [ts.createToken(25), ts.createToken(18)], { joiner: " " });
+                    if (node.body.kind !== 213 /* Block */) {
+                        // `() => 0` => `function f() { return 0; }`
+                        this.insertNodesAt(sourceFile, node.body.getStart(sourceFile), [ts.createToken(17 /* OpenBraceToken */), ts.createToken(96 /* ReturnKeyword */)], { joiner: " ", suffix: " " });
+                        this.insertNodesAt(sourceFile, node.body.end, [ts.createToken(25 /* SemicolonToken */), ts.createToken(18 /* CloseBraceToken */)], { joiner: " " });
                     }
                 }
                 else {
-                    var pos = ts.findChildOfKind(node, node.kind === 192 ? 89 : 75, sourceFile).end;
+                    var pos = ts.findChildOfKind(node, node.kind === 192 /* FunctionExpression */ ? 89 /* FunctionKeyword */ : 75 /* ClassKeyword */, sourceFile).end;
                     this.insertNodeAt(sourceFile, pos, ts.createIdentifier(name), { prefix: " " });
                 }
             };
             ChangeTracker.prototype.insertExportModifier = function (sourceFile, node) {
                 this.insertText(sourceFile, node.getStart(sourceFile), "export ");
             };
+            /**
+             * This function should be used to insert nodes in lists when nodes don't carry separators as the part of the node range,
+             * i.e. arguments in arguments lists, parameters in parameter lists etc.
+             * Note that separators are part of the node in statements and class elements.
+             */
             ChangeTracker.prototype.insertNodeInListAfter = function (sourceFile, after, newNode, containingList) {
                 if (containingList === void 0) { containingList = ts.formatting.SmartIndenter.getContainingList(after, sourceFile); }
                 if (!containingList) {
@@ -83275,19 +101166,53 @@ var ts;
                 }
                 var end = after.getEnd();
                 if (index !== containingList.length - 1) {
-                    var nextToken = ts.getTokenAtPosition(sourceFile, after.end, false);
+                    // any element except the last one
+                    // use next sibling as an anchor
+                    var nextToken = ts.getTokenAtPosition(sourceFile, after.end, /*includeJsDocComment*/ false);
                     if (nextToken && isSeparator(after, nextToken)) {
+                        // for list
+                        // a, b, c
+                        // create change for adding 'e' after 'a' as
+                        // - find start of next element after a (it is b)
+                        // - use this start as start and end position in final change
+                        // - build text of change by formatting the text of node + separator + whitespace trivia of b
+                        // in multiline case it will work as
+                        //   a,
+                        //   b,
+                        //   c,
+                        // result - '*' denotes leading trivia that will be inserted after new text (displayed as '#')
+                        //   a,*
+                        // ***insertedtext<separator>#
+                        // ###b,
+                        //   c,
+                        // find line and character of the next element
                         var lineAndCharOfNextElement = ts.getLineAndCharacterOfPosition(sourceFile, skipWhitespacesAndLineBreaks(sourceFile.text, containingList[index + 1].getFullStart()));
+                        // find line and character of the token that precedes next element (usually it is separator)
                         var lineAndCharOfNextToken = ts.getLineAndCharacterOfPosition(sourceFile, nextToken.end);
                         var prefix = void 0;
                         var startPos = void 0;
                         if (lineAndCharOfNextToken.line === lineAndCharOfNextElement.line) {
+                            // next element is located on the same line with separator:
+                            // a,$$$$b
+                            //  ^    ^
+                            //  |    |-next element
+                            //  |-separator
+                            // where $$$ is some leading trivia
+                            // for a newly inserted node we'll maintain the same relative position comparing to separator and replace leading trivia with spaces
+                            // a,    x,$$$$b
+                            //  ^    ^     ^
+                            //  |    |     |-next element
+                            //  |    |-new inserted node padded with spaces
+                            //  |-separator
                             startPos = nextToken.end;
                             prefix = spaces(lineAndCharOfNextElement.character - lineAndCharOfNextToken.character);
                         }
                         else {
+                            // next element is located on different line that separator
+                            // let insert position be the beginning of the line that contains next element
                             startPos = ts.getStartPositionOfLine(lineAndCharOfNextElement.line, sourceFile);
                         }
+                        // write separator and leading trivia of the next element as suffix
                         var suffix = "" + ts.tokenToString(nextToken.kind) + sourceFile.text.substring(nextToken.end, containingList[index + 1].getStart(sourceFile));
                         this.replaceRange(sourceFile, ts.createTextRange(startPos, containingList[index + 1].getStart(sourceFile)), newNode, { prefix: prefix, suffix: suffix });
                     }
@@ -83297,22 +101222,35 @@ var ts;
                     var afterStartLinePosition = ts.getLineStartPositionForPosition(afterStart, sourceFile);
                     var separator = void 0;
                     var multilineList = false;
+                    // insert element after the last element in the list that has more than one item
+                    // pick the element preceding the after element to:
+                    // - pick the separator
+                    // - determine if list is a multiline
                     if (containingList.length === 1) {
-                        separator = 26;
+                        // if list has only one element then we'll format is as multiline if node has comment in trailing trivia, or as singleline otherwise
+                        // i.e. var x = 1 // this is x
+                        //     | new element will be inserted at this position
+                        separator = 26 /* CommaToken */;
                     }
                     else {
+                        // element has more than one element, pick separator from the list
                         var tokenBeforeInsertPosition = ts.findPrecedingToken(after.pos, sourceFile);
-                        separator = isSeparator(after, tokenBeforeInsertPosition) ? tokenBeforeInsertPosition.kind : 26;
+                        separator = isSeparator(after, tokenBeforeInsertPosition) ? tokenBeforeInsertPosition.kind : 26 /* CommaToken */;
+                        // determine if list is multiline by checking lines of after element and element that precedes it.
                         var afterMinusOneStartLinePosition = ts.getLineStartPositionForPosition(containingList[index - 1].getStart(sourceFile), sourceFile);
                         multilineList = afterMinusOneStartLinePosition !== afterStartLinePosition;
                     }
                     if (hasCommentsBeforeLineBreak(sourceFile.text, after.end)) {
+                        // in this case we'll always treat containing list as multiline
                         multilineList = true;
                     }
                     if (multilineList) {
+                        // insert separator immediately following the 'after' node to preserve comments in trailing trivia
                         this.replaceRange(sourceFile, ts.createTextRange(end), ts.createToken(separator));
+                        // use the same indentation as 'after' item
                         var indentation = ts.formatting.SmartIndenter.findFirstNonWhitespaceColumn(afterStartLinePosition, afterStart, sourceFile, this.formatContext.options);
-                        var insertPos = ts.skipTrivia(sourceFile.text, end, true, false);
+                        // insert element before the line break on the line that contains 'after' element
+                        var insertPos = ts.skipTrivia(sourceFile.text, end, /*stopAfterLineBreak*/ true, /*stopAtComments*/ false);
                         if (insertPos !== end && ts.isLineBreak(sourceFile.text.charCodeAt(insertPos - 1))) {
                             insertPos--;
                         }
@@ -83329,6 +101267,7 @@ var ts;
                 this.classesWithNodesInsertedAtStart.forEach(function (cls) {
                     var sourceFile = cls.getSourceFile();
                     var _a = getClassBraceEnds(cls, sourceFile), openBraceEnd = _a[0], closeBraceEnd = _a[1];
+                    // For `class C { }` remove the whitespace inside the braces.
                     if (ts.positionsAreOnSameLine(openBraceEnd, closeBraceEnd, sourceFile) && openBraceEnd !== closeBraceEnd - 1) {
                         _this.deleteRange(sourceFile, ts.createTextRange(openBraceEnd, closeBraceEnd - 1));
                     }
@@ -83347,6 +101286,12 @@ var ts;
                     }
                 });
             };
+            /**
+             * Note: after calling this, the TextChanges object must be discarded!
+             * @param validate only for tests
+             *    The reason we must validate as part of this method is that `getNonFormattedText` changes the node's positions,
+             *    so we can only call this once and can't get the non-formatted text separately.
+             */
             ChangeTracker.prototype.getChanges = function (validate) {
                 this.finishClassesWithNodesInsertedAtStart();
                 this.finishTrailingCommaAfterDeletingNodesInList();
@@ -83363,25 +101308,29 @@ var ts;
             return ChangeTracker;
         }());
         textChanges_3.ChangeTracker = ChangeTracker;
+        // find first non-whitespace position in the leading trivia of the node
         function startPositionToDeleteNodeInList(sourceFile, node) {
-            return ts.skipTrivia(sourceFile.text, getAdjustedStartPosition(sourceFile, node, {}, Position.FullStart), false, true);
+            return ts.skipTrivia(sourceFile.text, getAdjustedStartPosition(sourceFile, node, {}, Position.FullStart), /*stopAfterLineBreak*/ false, /*stopAtComments*/ true);
         }
         function getClassBraceEnds(cls, sourceFile) {
-            return [ts.findChildOfKind(cls, 17, sourceFile).end, ts.findChildOfKind(cls, 18, sourceFile).end];
+            return [ts.findChildOfKind(cls, 17 /* OpenBraceToken */, sourceFile).end, ts.findChildOfKind(cls, 18 /* CloseBraceToken */, sourceFile).end];
         }
         var changesToText;
         (function (changesToText) {
             function getTextChangesFromChanges(changes, newLineCharacter, formatContext, validate) {
                 return ts.group(changes, function (c) { return c.sourceFile.path; }).map(function (changesInFile) {
                     var sourceFile = changesInFile[0].sourceFile;
+                    // order changes by start position
+                    // If the start position is the same, put the shorter range first, since an empty range (x, x) may precede (x, y) but not vice-versa.
                     var normalized = ts.stableSort(changesInFile, function (a, b) { return (a.range.pos - b.range.pos) || (a.range.end - b.range.end); });
-                    var _loop_21 = function (i) {
+                    var _loop_10 = function (i) {
                         ts.Debug.assert(normalized[i].range.end <= normalized[i + 1].range.pos, "Changes overlap", function () {
                             return JSON.stringify(normalized[i].range) + " and " + JSON.stringify(normalized[i + 1].range);
                         });
                     };
+                    // verify that change intervals do not overlap, except possibly at end points.
                     for (var i = 0; i < normalized.length - 1; i++) {
-                        _loop_21(i);
+                        _loop_10(i);
                     }
                     var textChanges = normalized.map(function (c) {
                         return ts.createTextChange(ts.createTextSpanFromRange(c.range), computeNewText(c, sourceFile, newLineCharacter, formatContext, validate));
@@ -83391,8 +101340,9 @@ var ts;
             }
             changesToText.getTextChangesFromChanges = getTextChangesFromChanges;
             function newFileChanges(oldFile, fileName, statements, newLineCharacter, formatContext) {
+                // TODO: this emits the file, parses it back, then formats it that -- may be a less roundabout way to do this
                 var nonFormattedText = statements.map(function (s) { return getNonformattedText(s, oldFile, newLineCharacter).text; }).join(newLineCharacter);
-                var sourceFile = ts.createSourceFile(fileName, nonFormattedText, 6);
+                var sourceFile = ts.createSourceFile(fileName, nonFormattedText, 6 /* ESNext */, /*setParentNodes*/ true);
                 var changes = ts.formatting.formatDocument(sourceFile, formatContext);
                 var text = applyChanges(nonFormattedText, changes);
                 return { fileName: fileName, textChanges: [ts.createTextChange(ts.createTextSpan(0, 0), text)], isNewFile: true };
@@ -83408,11 +101358,13 @@ var ts;
                 var _a = change.options, options = _a === void 0 ? {} : _a, pos = change.range.pos;
                 var format = function (n) { return getFormattedTextOfNode(n, sourceFile, pos, options, newLineCharacter, formatContext, validate); };
                 var text = change.kind === ChangeKind.ReplaceWithMultipleNodes
-                    ? change.nodes.map(function (n) { return ts.removeSuffix(format(n), newLineCharacter); }).join(change.options.joiner || newLineCharacter)
+                    ? change.nodes.map(function (n) { return ts.removeSuffix(format(n), newLineCharacter); }).join(change.options.joiner || newLineCharacter) // TODO: GH#18217
                     : format(change.node);
+                // strip initial indentation (spaces or tabs) if text will be inserted in the middle of the line
                 var noIndent = (options.preserveLeadingWhitespace || options.indentation !== undefined || ts.getLineStartPositionForPosition(pos, sourceFile) === pos) ? text : text.replace(/^\s+/, "");
                 return (options.prefix || "") + noIndent + (options.suffix || "");
             }
+            /** Note: this may mutate `nodeIn`. */
             function getFormattedTextOfNode(nodeIn, sourceFile, pos, _a, newLineCharacter, formatContext, validate) {
                 var indentation = _a.indentation, prefix = _a.prefix, delta = _a.delta;
                 var _b = getNonformattedText(nodeIn, sourceFile, newLineCharacter), node = _b.node, text = _b.text;
@@ -83429,10 +101381,11 @@ var ts;
                 var changes = ts.formatting.formatNodeGivenIndentation(node, file, sourceFile.languageVariant, initialIndentation, delta, formatContext);
                 return applyChanges(text, changes);
             }
+            /** Note: output node may be mutated input node. */
             function getNonformattedText(node, sourceFile, newLineCharacter) {
                 var writer = new Writer(newLineCharacter);
-                var newLine = newLineCharacter === "\n" ? 1 : 0;
-                ts.createPrinter({ newLine: newLine }, writer).writeNode(4, node, sourceFile, writer);
+                var newLine = newLineCharacter === "\n" ? 1 /* LineFeed */ : 0 /* CarriageReturnLineFeed */;
+                ts.createPrinter({ newLine: newLine }, writer).writeNode(4 /* Unspecified */, node, sourceFile, writer);
                 return { text: writer.getText(), node: assignPositionsToNode(node) };
             }
         })(changesToText || (changesToText = {}));
@@ -83448,7 +101401,8 @@ var ts;
             return ts.skipTrivia(s, 0) === s.length;
         }
         function assignPositionsToNode(node) {
-            var visited = ts.visitEachChild(node, assignPositionsToNode, ts.nullTransformationContext, assignPositionsToNodeArray, assignPositionsToNode);
+            var visited = ts.visitEachChild(node, assignPositionsToNode, ts.nullTransformationContext, assignPositionsToNodeArray, assignPositionsToNode); // TODO: GH#18217
+            // create proxy node for non synthesized nodes
             var newNode = ts.nodeIsSynthesized(visited) ? visited : Object.create(visited);
             newNode.pos = getPos(node);
             newNode.end = getEnd(node);
@@ -83459,12 +101413,13 @@ var ts;
             if (!visited) {
                 return visited;
             }
+            // clone nodearray if necessary
             var nodeArray = visited === nodes ? ts.createNodeArray(visited.slice(0)) : visited;
             nodeArray.pos = getPos(nodes);
             nodeArray.end = getEnd(nodes);
             return nodeArray;
         }
-        var Writer = (function () {
+        var Writer = /** @class */ (function () {
             function Writer(newLine) {
                 var _this = this;
                 this.lastNonTriviaPosition = 0;
@@ -83506,44 +101461,45 @@ var ts;
                     while (ts.isWhiteSpaceLike(s.charCodeAt(s.length - i - 1))) {
                         i++;
                     }
+                    // trim trailing whitespaces
                     this.lastNonTriviaPosition -= i;
                 }
             };
             Writer.prototype.write = function (s) {
                 this.writer.write(s);
-                this.setLastNonTriviaPosition(s, false);
+                this.setLastNonTriviaPosition(s, /*force*/ false);
             };
             Writer.prototype.writeKeyword = function (s) {
                 this.writer.writeKeyword(s);
-                this.setLastNonTriviaPosition(s, false);
+                this.setLastNonTriviaPosition(s, /*force*/ false);
             };
             Writer.prototype.writeOperator = function (s) {
                 this.writer.writeOperator(s);
-                this.setLastNonTriviaPosition(s, false);
+                this.setLastNonTriviaPosition(s, /*force*/ false);
             };
             Writer.prototype.writePunctuation = function (s) {
                 this.writer.writePunctuation(s);
-                this.setLastNonTriviaPosition(s, false);
+                this.setLastNonTriviaPosition(s, /*force*/ false);
             };
             Writer.prototype.writeParameter = function (s) {
                 this.writer.writeParameter(s);
-                this.setLastNonTriviaPosition(s, false);
+                this.setLastNonTriviaPosition(s, /*force*/ false);
             };
             Writer.prototype.writeProperty = function (s) {
                 this.writer.writeProperty(s);
-                this.setLastNonTriviaPosition(s, false);
+                this.setLastNonTriviaPosition(s, /*force*/ false);
             };
             Writer.prototype.writeSpace = function (s) {
                 this.writer.writeSpace(s);
-                this.setLastNonTriviaPosition(s, false);
+                this.setLastNonTriviaPosition(s, /*force*/ false);
             };
             Writer.prototype.writeStringLiteral = function (s) {
                 this.writer.writeStringLiteral(s);
-                this.setLastNonTriviaPosition(s, false);
+                this.setLastNonTriviaPosition(s, /*force*/ false);
             };
             Writer.prototype.writeSymbol = function (s, sym) {
                 this.writer.writeSymbol(s, sym);
-                this.setLastNonTriviaPosition(s, false);
+                this.setLastNonTriviaPosition(s, /*force*/ false);
             };
             Writer.prototype.writeTextOfNode = function (text, node) {
                 this.writer.writeTextOfNode(text, node);
@@ -83562,11 +101518,11 @@ var ts;
             };
             Writer.prototype.rawWrite = function (s) {
                 this.writer.rawWrite(s);
-                this.setLastNonTriviaPosition(s, false);
+                this.setLastNonTriviaPosition(s, /*force*/ false);
             };
             Writer.prototype.writeLiteral = function (s) {
                 this.writer.writeLiteral(s);
-                this.setLastNonTriviaPosition(s, true);
+                this.setLastNonTriviaPosition(s, /*force*/ true);
             };
             Writer.prototype.getTextPos = function () {
                 return this.writer.getTextPos();
@@ -83597,17 +101553,20 @@ var ts;
                 position = shebang.length;
                 advancePastLineBreak();
             }
+            // For a source file, it is possible there are detached comments we should not skip
             var ranges = ts.getLeadingCommentRanges(text, position);
             if (!ranges)
                 return position;
-            if (ranges.length && ranges[0].kind === 3 && ts.isPinnedComment(text, ranges[0].pos)) {
+            // However we should still skip a pinned comment at the top
+            if (ranges.length && ranges[0].kind === 3 /* MultiLineCommentTrivia */ && ts.isPinnedComment(text, ranges[0].pos)) {
                 position = ranges[0].end;
                 advancePastLineBreak();
                 ranges = ranges.slice(1);
             }
+            // As well as any triple slash references
             for (var _i = 0, ranges_1 = ranges; _i < ranges_1.length; _i++) {
                 var range = ranges_1[_i];
-                if (range.kind === 2 && ts.isRecognizedTripleSlashComment(text, range.pos, range.end)) {
+                if (range.kind === 2 /* SingleLineCommentTrivia */ && ts.isRecognizedTripleSlashComment(text, range.pos, range.end)) {
                     position = range.end;
                     advancePastLineBreak();
                     continue;
@@ -83620,7 +101579,7 @@ var ts;
                     var charCode = text.charCodeAt(position);
                     if (ts.isLineBreak(charCode)) {
                         position++;
-                        if (position < text.length && charCode === 13 && text.charCodeAt(position) === 10) {
+                        if (position < text.length && charCode === 13 /* carriageReturn */ && text.charCodeAt(position) === 10 /* lineFeed */) {
                             position++;
                         }
                     }
@@ -83632,11 +101591,12 @@ var ts;
         }
         textChanges_3.isValidLocationToAddComment = isValidLocationToAddComment;
         function needSemicolonBetween(a, b) {
-            return (ts.isPropertySignature(a) || ts.isPropertyDeclaration(a)) && ts.isClassOrTypeElement(b) && b.name.kind === 147
-                || ts.isStatementButNotDeclaration(a) && ts.isStatementButNotDeclaration(b);
+            return (ts.isPropertySignature(a) || ts.isPropertyDeclaration(a)) && ts.isClassOrTypeElement(b) && b.name.kind === 147 /* ComputedPropertyName */
+                || ts.isStatementButNotDeclaration(a) && ts.isStatementButNotDeclaration(b); // TODO: only if b would start with a `(` or `[`
         }
     })(textChanges = ts.textChanges || (ts.textChanges = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var codefix;
@@ -83649,7 +101609,7 @@ var ts;
                 : ts.getLocaleSpecificMessage(diag);
         }
         function createCodeFixActionNoFixId(fixName, changes, description) {
-            return createCodeFixActionWorker(fixName, diagnosticToString(description), changes, undefined, undefined);
+            return createCodeFixActionWorker(fixName, diagnosticToString(description), changes, /*fixId*/ undefined, /*fixAllDescription*/ undefined);
         }
         codefix.createCodeFixActionNoFixId = createCodeFixActionNoFixId;
         function createCodeFixAction(fixName, changes, description, fixId, fixAllDescription, command) {
@@ -83682,6 +101642,7 @@ var ts;
         }
         codefix.getFixes = getFixes;
         function getAllFixes(context) {
+            // Currently fixId is always a string.
             return fixIdToRegistration.get(ts.cast(context.fixId, ts.isString)).getAllCodeActions(context);
         }
         codefix.getAllFixes = getAllFixes;
@@ -83711,11 +101672,15 @@ var ts;
         }
     })(codefix = ts.codefix || (ts.codefix = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var refactor;
     (function (refactor_1) {
+        // A map with the refactor code as key, the refactor itself as value
+        // e.g.  nonSuggestableRefactors[refactorCode] -> the refactor you want
         var refactors = ts.createMap();
+        /** @param name An unique code associated with each refactor. Does not have to be human-readable. */
         function registerRefactor(name, refactor) {
             refactors.set(name, refactor);
         }
@@ -83738,6 +101703,7 @@ var ts;
     }
     ts.getRefactorContextSpan = getRefactorContextSpan;
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var codefix;
@@ -83754,14 +101720,15 @@ var ts;
             getAllCodeActions: function (context) { return codefix.codeFixAll(context, errorCodes, function (changes, diag) { return makeChange(changes, diag.file, diag.start); }); },
         });
         function makeChange(changeTracker, sourceFile, pos) {
-            var token = ts.getTokenAtPosition(sourceFile, pos, false);
+            var token = ts.getTokenAtPosition(sourceFile, pos, /*includeJsDocComment*/ false);
             var decorator = ts.findAncestor(token, ts.isDecorator);
             ts.Debug.assert(!!decorator, "Expected position to be owned by a decorator.");
-            var replacement = ts.createCall(decorator.expression, undefined, undefined);
+            var replacement = ts.createCall(decorator.expression, /*typeArguments*/ undefined, /*argumentsArray*/ undefined);
             changeTracker.replaceNode(sourceFile, decorator.expression, replacement);
         }
     })(codefix = ts.codefix || (ts.codefix = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var codefix;
@@ -83785,7 +101752,8 @@ var ts;
             }); },
         });
         function getDeclaration(file, pos) {
-            var name = ts.getTokenAtPosition(file, pos, false);
+            var name = ts.getTokenAtPosition(file, pos, /*includeJsDocComment*/ false);
+            // For an arrow function with no name, 'name' lands on the first parameter.
             return ts.tryCast(ts.isParameter(name.parent) ? name.parent.parent : name.parent, parameterShouldGetTypeFromJSDoc);
         }
         function parameterShouldGetTypeFromJSDoc(node) {
@@ -83804,9 +101772,9 @@ var ts;
                     if (typeParameters.length)
                         changes.insertTypeParameters(sourceFile, decl, typeParameters);
                 }
-                var needParens = ts.isArrowFunction(decl) && !ts.findChildOfKind(decl, 19, sourceFile);
+                var needParens = ts.isArrowFunction(decl) && !ts.findChildOfKind(decl, 19 /* OpenParenToken */, sourceFile);
                 if (needParens)
-                    changes.insertNodeBefore(sourceFile, ts.first(decl.parameters), ts.createToken(19));
+                    changes.insertNodeBefore(sourceFile, ts.first(decl.parameters), ts.createToken(19 /* OpenParenToken */));
                 for (var _i = 0, _a = decl.parameters; _i < _a.length; _i++) {
                     var param = _a[_i];
                     if (!param.type) {
@@ -83816,7 +101784,7 @@ var ts;
                     }
                 }
                 if (needParens)
-                    changes.insertNodeAfter(sourceFile, ts.last(decl.parameters), ts.createToken(20));
+                    changes.insertNodeAfter(sourceFile, ts.last(decl.parameters), ts.createToken(20 /* CloseParenToken */));
                 if (!decl.type) {
                     var returnType = ts.getJSDocReturnType(decl);
                     if (returnType)
@@ -83824,37 +101792,37 @@ var ts;
                 }
             }
             else {
-                var jsdocType = ts.Debug.assertDefined(ts.getJSDocType(decl));
-                ts.Debug.assert(!decl.type);
+                var jsdocType = ts.Debug.assertDefined(ts.getJSDocType(decl)); // If not defined, shouldn't have been an error to fix
+                ts.Debug.assert(!decl.type); // If defined, shouldn't have been an error to fix.
                 changes.tryInsertTypeAnnotation(sourceFile, decl, transformJSDocType(jsdocType));
             }
         }
         function isDeclarationWithType(node) {
             return ts.isFunctionLikeDeclaration(node) ||
-                node.kind === 232 ||
-                node.kind === 151 ||
-                node.kind === 152;
+                node.kind === 232 /* VariableDeclaration */ ||
+                node.kind === 151 /* PropertySignature */ ||
+                node.kind === 152 /* PropertyDeclaration */;
         }
         function transformJSDocType(node) {
             switch (node.kind) {
-                case 279:
-                case 280:
+                case 279 /* JSDocAllType */:
+                case 280 /* JSDocUnknownType */:
                     return ts.createTypeReferenceNode("any", ts.emptyArray);
-                case 283:
+                case 283 /* JSDocOptionalType */:
                     return transformJSDocOptionalType(node);
-                case 282:
+                case 282 /* JSDocNonNullableType */:
                     return transformJSDocType(node.type);
-                case 281:
+                case 281 /* JSDocNullableType */:
                     return transformJSDocNullableType(node);
-                case 285:
+                case 285 /* JSDocVariadicType */:
                     return transformJSDocVariadicType(node);
-                case 284:
+                case 284 /* JSDocFunctionType */:
                     return transformJSDocFunctionType(node);
-                case 162:
+                case 162 /* TypeReference */:
                     return transformJSDocTypeReference(node);
                 default:
-                    var visited = ts.visitEachChild(node, transformJSDocType, undefined);
-                    ts.setEmitFlags(visited, 1);
+                    var visited = ts.visitEachChild(node, transformJSDocType, /*context*/ undefined); // TODO: GH#18217
+                    ts.setEmitFlags(visited, 1 /* SingleLine */);
                     return visited;
             }
         }
@@ -83872,9 +101840,9 @@ var ts;
         }
         function transformJSDocParameter(node) {
             var index = node.parent.parameters.indexOf(node);
-            var isRest = node.type.kind === 285 && index === node.parent.parameters.length - 1;
+            var isRest = node.type.kind === 285 /* JSDocVariadicType */ && index === node.parent.parameters.length - 1; // TODO: GH#18217
             var name = node.name || (isRest ? "rest" : "arg" + index);
-            var dotdotdot = isRest ? ts.createToken(24) : node.dotDotDotToken;
+            var dotdotdot = isRest ? ts.createToken(24 /* DotDotDotToken */) : node.dotDotDotToken;
             return ts.createParameter(node.decorators, node.modifiers, dotdotdot, name, node.questionToken, ts.visitNode(node.type, transformJSDocType), node.initializer);
         }
         function transformJSDocTypeReference(node) {
@@ -83909,13 +101877,19 @@ var ts;
             return ts.createTypeReferenceNode(name, args);
         }
         function transformJSDocIndexSignature(node) {
-            var index = ts.createParameter(undefined, undefined, undefined, node.typeArguments[0].kind === 134 ? "n" : "s", undefined, ts.createTypeReferenceNode(node.typeArguments[0].kind === 134 ? "number" : "string", []), undefined);
-            var indexSignature = ts.createTypeLiteralNode([ts.createIndexSignature(undefined, undefined, [index], node.typeArguments[1])]);
-            ts.setEmitFlags(indexSignature, 1);
+            var index = ts.createParameter(
+            /*decorators*/ undefined, 
+            /*modifiers*/ undefined, 
+            /*dotDotDotToken*/ undefined, node.typeArguments[0].kind === 134 /* NumberKeyword */ ? "n" : "s", 
+            /*questionToken*/ undefined, ts.createTypeReferenceNode(node.typeArguments[0].kind === 134 /* NumberKeyword */ ? "number" : "string", []), 
+            /*initializer*/ undefined);
+            var indexSignature = ts.createTypeLiteralNode([ts.createIndexSignature(/*decorators*/ undefined, /*modifiers*/ undefined, [index], node.typeArguments[1])]);
+            ts.setEmitFlags(indexSignature, 1 /* SingleLine */);
             return indexSignature;
         }
     })(codefix = ts.codefix || (ts.codefix = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var codefix;
@@ -83933,28 +101907,29 @@ var ts;
         });
         function doChange(changes, sourceFile, position, checker) {
             var deletedNodes = [];
-            var ctorSymbol = checker.getSymbolAtLocation(ts.getTokenAtPosition(sourceFile, position, false));
-            if (!ctorSymbol || !(ctorSymbol.flags & (16 | 3))) {
+            var ctorSymbol = checker.getSymbolAtLocation(ts.getTokenAtPosition(sourceFile, position, /*includeJsDocComment*/ false));
+            if (!ctorSymbol || !(ctorSymbol.flags & (16 /* Function */ | 3 /* Variable */))) {
+                // Bad input
                 return undefined;
             }
             var ctorDeclaration = ctorSymbol.valueDeclaration;
             var precedingNode;
             var newClassDeclaration;
             switch (ctorDeclaration.kind) {
-                case 234:
+                case 234 /* FunctionDeclaration */:
                     precedingNode = ctorDeclaration;
                     deleteNode(ctorDeclaration);
                     newClassDeclaration = createClassFromFunctionDeclaration(ctorDeclaration);
                     break;
-                case 232:
+                case 232 /* VariableDeclaration */:
                     precedingNode = ctorDeclaration.parent.parent;
                     newClassDeclaration = createClassFromVariableDeclaration(ctorDeclaration);
                     if (ctorDeclaration.parent.declarations.length === 1) {
-                        copyComments(precedingNode, newClassDeclaration, sourceFile);
+                        copyComments(precedingNode, newClassDeclaration, sourceFile); // TODO: GH#18217
                         deleteNode(precedingNode);
                     }
                     else {
-                        deleteNode(ctorDeclaration, true);
+                        deleteNode(ctorDeclaration, /*inList*/ true);
                     }
                     break;
             }
@@ -83962,6 +101937,7 @@ var ts;
                 return undefined;
             }
             copyComments(ctorDeclaration, newClassDeclaration, sourceFile);
+            // Because the preceding node could be touched, we need to insert nodes before delete nodes.
             changes.insertNodeAfter(sourceFile, precedingNode, newClassDeclaration);
             for (var _i = 0, deletedNodes_1 = deletedNodes; _i < deletedNodes_1.length; _i++) {
                 var _a = deletedNodes_1[_i], node = _a.node, inList = _a.inList;
@@ -83974,23 +101950,26 @@ var ts;
             }
             function deleteNode(node, inList) {
                 if (inList === void 0) { inList = false; }
+                // If parent node has already been deleted, do nothing
                 if (!deletedNodes.some(function (n) { return ts.isNodeDescendantOf(node, n.node); })) {
                     deletedNodes.push({ node: node, inList: inList });
                 }
             }
             function createClassElementsFromSymbol(symbol) {
                 var memberElements = [];
+                // all instance members are stored in the "member" array of symbol
                 if (symbol.members) {
                     symbol.members.forEach(function (member) {
-                        var memberElement = createClassElement(member, undefined);
+                        var memberElement = createClassElement(member, /*modifiers*/ undefined);
                         if (memberElement) {
                             memberElements.push(memberElement);
                         }
                     });
                 }
+                // all static members are stored in the "exports" array of symbol
                 if (symbol.exports) {
                     symbol.exports.forEach(function (member) {
-                        var memberElement = createClassElement(member, [ts.createToken(115)]);
+                        var memberElement = createClassElement(member, [ts.createToken(115 /* StaticKeyword */)]);
                         if (memberElement) {
                             memberElements.push(memberElement);
                         }
@@ -83998,10 +101977,13 @@ var ts;
                 }
                 return memberElements;
                 function shouldConvertDeclaration(_target, source) {
+                    // Right now the only thing we can convert are function expressions - other values shouldn't get
+                    // transformed. We can update this once ES public class properties are available.
                     return ts.isFunctionLike(source);
                 }
                 function createClassElement(symbol, modifiers) {
-                    if (!(symbol.flags & 8192)) {
+                    // Right now the only thing we can convert are function expressions, which are marked as methods
+                    if (!(symbol.flags & 8192 /* Method */)) {
                         return;
                     }
                     var memberDeclaration = symbol.valueDeclaration;
@@ -84009,40 +101991,48 @@ var ts;
                     if (!shouldConvertDeclaration(memberDeclaration, assignmentBinaryExpression.right)) {
                         return;
                     }
-                    var nodeToDelete = assignmentBinaryExpression.parent && assignmentBinaryExpression.parent.kind === 216
+                    // delete the entire statement if this expression is the sole expression to take care of the semicolon at the end
+                    var nodeToDelete = assignmentBinaryExpression.parent && assignmentBinaryExpression.parent.kind === 216 /* ExpressionStatement */
                         ? assignmentBinaryExpression.parent : assignmentBinaryExpression;
                     deleteNode(nodeToDelete);
                     if (!assignmentBinaryExpression.right) {
-                        return ts.createProperty([], modifiers, symbol.name, undefined, undefined, undefined);
+                        return ts.createProperty([], modifiers, symbol.name, /*questionToken*/ undefined, 
+                        /*type*/ undefined, /*initializer*/ undefined);
                     }
                     switch (assignmentBinaryExpression.right.kind) {
-                        case 192: {
+                        case 192 /* FunctionExpression */: {
                             var functionExpression = assignmentBinaryExpression.right;
-                            var fullModifiers = ts.concatenate(modifiers, getModifierKindFromSource(functionExpression, 120));
-                            var method = ts.createMethod(undefined, fullModifiers, undefined, memberDeclaration.name, undefined, undefined, functionExpression.parameters, undefined, functionExpression.body);
+                            var fullModifiers = ts.concatenate(modifiers, getModifierKindFromSource(functionExpression, 120 /* AsyncKeyword */));
+                            var method = ts.createMethod(/*decorators*/ undefined, fullModifiers, /*asteriskToken*/ undefined, memberDeclaration.name, /*questionToken*/ undefined, 
+                            /*typeParameters*/ undefined, functionExpression.parameters, /*type*/ undefined, functionExpression.body);
                             copyComments(assignmentBinaryExpression, method, sourceFile);
                             return method;
                         }
-                        case 193: {
+                        case 193 /* ArrowFunction */: {
                             var arrowFunction = assignmentBinaryExpression.right;
                             var arrowFunctionBody = arrowFunction.body;
                             var bodyBlock = void 0;
-                            if (arrowFunctionBody.kind === 213) {
+                            // case 1: () => { return [1,2,3] }
+                            if (arrowFunctionBody.kind === 213 /* Block */) {
                                 bodyBlock = arrowFunctionBody;
                             }
+                            // case 2: () => [1,2,3]
                             else {
                                 bodyBlock = ts.createBlock([ts.createReturn(arrowFunctionBody)]);
                             }
-                            var fullModifiers = ts.concatenate(modifiers, getModifierKindFromSource(arrowFunction, 120));
-                            var method = ts.createMethod(undefined, fullModifiers, undefined, memberDeclaration.name, undefined, undefined, arrowFunction.parameters, undefined, bodyBlock);
+                            var fullModifiers = ts.concatenate(modifiers, getModifierKindFromSource(arrowFunction, 120 /* AsyncKeyword */));
+                            var method = ts.createMethod(/*decorators*/ undefined, fullModifiers, /*asteriskToken*/ undefined, memberDeclaration.name, /*questionToken*/ undefined, 
+                            /*typeParameters*/ undefined, arrowFunction.parameters, /*type*/ undefined, bodyBlock);
                             copyComments(assignmentBinaryExpression, method, sourceFile);
                             return method;
                         }
                         default: {
+                            // Don't try to declare members in JavaScript files
                             if (ts.isSourceFileJavaScript(sourceFile)) {
                                 return;
                             }
-                            var prop = ts.createProperty(undefined, modifiers, memberDeclaration.name, undefined, undefined, assignmentBinaryExpression.right);
+                            var prop = ts.createProperty(/*decorators*/ undefined, modifiers, memberDeclaration.name, /*questionToken*/ undefined, 
+                            /*type*/ undefined, assignmentBinaryExpression.right);
                             copyComments(assignmentBinaryExpression.parent, prop, sourceFile);
                             return prop;
                         }
@@ -84051,37 +102041,44 @@ var ts;
             }
             function createClassFromVariableDeclaration(node) {
                 var initializer = node.initializer;
-                if (!initializer || initializer.kind !== 192) {
+                if (!initializer || initializer.kind !== 192 /* FunctionExpression */) {
                     return undefined;
                 }
-                if (node.name.kind !== 71) {
+                if (node.name.kind !== 71 /* Identifier */) {
                     return undefined;
                 }
                 var memberElements = createClassElementsFromSymbol(node.symbol);
                 if (initializer.body) {
-                    memberElements.unshift(ts.createConstructor(undefined, undefined, initializer.parameters, initializer.body));
+                    memberElements.unshift(ts.createConstructor(/*decorators*/ undefined, /*modifiers*/ undefined, initializer.parameters, initializer.body));
                 }
-                var modifiers = getModifierKindFromSource(precedingNode, 84);
-                var cls = ts.createClassDeclaration(undefined, modifiers, node.name, undefined, undefined, memberElements);
+                var modifiers = getModifierKindFromSource(precedingNode, 84 /* ExportKeyword */);
+                var cls = ts.createClassDeclaration(/*decorators*/ undefined, modifiers, node.name, 
+                /*typeParameters*/ undefined, /*heritageClauses*/ undefined, memberElements);
+                // Don't call copyComments here because we'll already leave them in place
                 return cls;
             }
             function createClassFromFunctionDeclaration(node) {
                 var memberElements = createClassElementsFromSymbol(ctorSymbol);
                 if (node.body) {
-                    memberElements.unshift(ts.createConstructor(undefined, undefined, node.parameters, node.body));
+                    memberElements.unshift(ts.createConstructor(/*decorators*/ undefined, /*modifiers*/ undefined, node.parameters, node.body));
                 }
-                var modifiers = getModifierKindFromSource(node, 84);
-                var cls = ts.createClassDeclaration(undefined, modifiers, node.name, undefined, undefined, memberElements);
+                var modifiers = getModifierKindFromSource(node, 84 /* ExportKeyword */);
+                var cls = ts.createClassDeclaration(/*decorators*/ undefined, modifiers, node.name, 
+                /*typeParameters*/ undefined, /*heritageClauses*/ undefined, memberElements);
+                // Don't call copyComments here because we'll already leave them in place
                 return cls;
             }
         }
         function copyComments(sourceNode, targetNode, sourceFile) {
             ts.forEachLeadingCommentRange(sourceFile.text, sourceNode.pos, function (pos, end, kind, htnl) {
-                if (kind === 3) {
+                if (kind === 3 /* MultiLineCommentTrivia */) {
+                    // Remove leading /*
                     pos += 2;
+                    // Remove trailing */
                     end -= 2;
                 }
                 else {
+                    // Remove leading //
                     pos += 2;
                 }
                 ts.addSyntheticLeadingComment(targetNode, kind, sourceFile.text.slice(pos, end), htnl);
@@ -84092,6 +102089,7 @@ var ts;
         }
     })(codefix = ts.codefix || (ts.codefix = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var codefix;
@@ -84101,18 +102099,19 @@ var ts;
             getCodeActions: function (context) {
                 var sourceFile = context.sourceFile, program = context.program, preferences = context.preferences;
                 var changes = ts.textChanges.ChangeTracker.with(context, function (changes) {
-                    var moduleExportsChangedToDefault = convertFileToEs6Module(sourceFile, program.getTypeChecker(), changes, program.getCompilerOptions().target, preferences);
+                    var moduleExportsChangedToDefault = convertFileToEs6Module(sourceFile, program.getTypeChecker(), changes, program.getCompilerOptions().target, ts.getQuotePreference(sourceFile, preferences));
                     if (moduleExportsChangedToDefault) {
                         for (var _i = 0, _a = program.getSourceFiles(); _i < _a.length; _i++) {
                             var importingFile = _a[_i];
-                            fixImportOfModuleExports(importingFile, sourceFile, changes, preferences);
+                            fixImportOfModuleExports(importingFile, sourceFile, changes, ts.getQuotePreference(importingFile, preferences));
                         }
                     }
                 });
+                // No support for fix-all since this applies to the whole file at once anyway.
                 return [codefix.createCodeFixActionNoFixId("convertToEs6Module", changes, ts.Diagnostics.Convert_to_ES6_module)];
             },
         });
-        function fixImportOfModuleExports(importingFile, exportingFile, changes, preferences) {
+        function fixImportOfModuleExports(importingFile, exportingFile, changes, quotePreference) {
             for (var _i = 0, _a = importingFile.imports; _i < _a.length; _i++) {
                 var moduleSpecifier = _a[_i];
                 var imported = ts.getResolvedModule(importingFile, moduleSpecifier.text);
@@ -84121,25 +102120,26 @@ var ts;
                 }
                 var importNode = ts.importFromModuleSpecifier(moduleSpecifier);
                 switch (importNode.kind) {
-                    case 243:
-                        changes.replaceNode(importingFile, importNode, ts.makeImport(importNode.name, undefined, moduleSpecifier, preferences));
+                    case 243 /* ImportEqualsDeclaration */:
+                        changes.replaceNode(importingFile, importNode, ts.makeImport(importNode.name, /*namedImports*/ undefined, moduleSpecifier, quotePreference));
                         break;
-                    case 187:
-                        if (ts.isRequireCall(importNode, false)) {
+                    case 187 /* CallExpression */:
+                        if (ts.isRequireCall(importNode, /*checkArgumentIsStringLiteralLike*/ false)) {
                             changes.replaceNode(importingFile, importNode, ts.createPropertyAccess(ts.getSynthesizedDeepClone(importNode), "default"));
                         }
                         break;
                 }
             }
         }
-        function convertFileToEs6Module(sourceFile, checker, changes, target, preferences) {
+        /** @returns Whether we converted a `module.exports =` to a default export. */
+        function convertFileToEs6Module(sourceFile, checker, changes, target, quotePreference) {
             var identifiers = { original: collectFreeIdentifiers(sourceFile), additional: ts.createMap() };
             var exports = collectExportRenames(sourceFile, checker, identifiers);
             convertExportsAccesses(sourceFile, exports, changes);
             var moduleExportsChangedToDefault = false;
             for (var _i = 0, _a = sourceFile.statements; _i < _a.length; _i++) {
                 var statement = _a[_i];
-                var moduleExportsChanged = convertStatement(sourceFile, statement, checker, changes, identifiers, target, exports, preferences);
+                var moduleExportsChanged = convertStatement(sourceFile, statement, checker, changes, identifiers, target, exports, quotePreference);
                 moduleExportsChangedToDefault = moduleExportsChangedToDefault || moduleExportsChanged;
             }
             return moduleExportsChangedToDefault;
@@ -84149,7 +102149,8 @@ var ts;
             forEachExportReference(sourceFile, function (node) {
                 var _a = node.name, text = _a.text, originalKeywordKind = _a.originalKeywordKind;
                 if (!res.has(text) && (originalKeywordKind !== undefined && ts.isNonContextualKeyword(originalKeywordKind)
-                    || checker.resolveName(node.name.text, node, 67216319, true))) {
+                    || checker.resolveName(node.name.text, node, 67216319 /* Value */, /*excludeGlobals*/ true))) {
+                    // Unconditionally add an underscore in case `text` is a keyword.
                     res.set(text, makeUniqueName("_" + text, identifiers));
                 }
             });
@@ -84168,72 +102169,80 @@ var ts;
             sourceFile.forEachChild(function recur(node) {
                 if (ts.isPropertyAccessExpression(node) && ts.isExportsOrModuleExportsOrAlias(sourceFile, node.expression)) {
                     var parent = node.parent;
-                    cb(node, ts.isBinaryExpression(parent) && parent.left === node && parent.operatorToken.kind === 58);
+                    cb(node, ts.isBinaryExpression(parent) && parent.left === node && parent.operatorToken.kind === 58 /* EqualsToken */);
                 }
                 node.forEachChild(recur);
             });
         }
-        function convertStatement(sourceFile, statement, checker, changes, identifiers, target, exports, preferences) {
+        function convertStatement(sourceFile, statement, checker, changes, identifiers, target, exports, quotePreference) {
             switch (statement.kind) {
-                case 214:
-                    convertVariableStatement(sourceFile, statement, changes, checker, identifiers, target, preferences);
+                case 214 /* VariableStatement */:
+                    convertVariableStatement(sourceFile, statement, changes, checker, identifiers, target, quotePreference);
                     return false;
-                case 216: {
+                case 216 /* ExpressionStatement */: {
                     var expression = statement.expression;
                     switch (expression.kind) {
-                        case 187: {
-                            if (ts.isRequireCall(expression, true)) {
-                                changes.replaceNode(sourceFile, statement, ts.makeImport(undefined, undefined, expression.arguments[0], preferences));
+                        case 187 /* CallExpression */: {
+                            if (ts.isRequireCall(expression, /*checkArgumentIsStringLiteralLike*/ true)) {
+                                // For side-effecting require() call, just make a side-effecting import.
+                                changes.replaceNode(sourceFile, statement, ts.makeImport(/*name*/ undefined, /*namedImports*/ undefined, expression.arguments[0], quotePreference));
                             }
                             return false;
                         }
-                        case 200: {
+                        case 200 /* BinaryExpression */: {
                             var operatorToken = expression.operatorToken;
-                            return operatorToken.kind === 58 && convertAssignment(sourceFile, checker, expression, changes, exports);
+                            return operatorToken.kind === 58 /* EqualsToken */ && convertAssignment(sourceFile, checker, expression, changes, exports);
                         }
                     }
                 }
+                // falls through
                 default:
                     return false;
             }
         }
-        function convertVariableStatement(sourceFile, statement, changes, checker, identifiers, target, preferences) {
+        function convertVariableStatement(sourceFile, statement, changes, checker, identifiers, target, quotePreference) {
             var declarationList = statement.declarationList;
             var foundImport = false;
             var newNodes = ts.flatMap(declarationList.declarations, function (decl) {
                 var name = decl.name, initializer = decl.initializer;
                 if (initializer) {
                     if (ts.isExportsOrModuleExportsOrAlias(sourceFile, initializer)) {
+                        // `const alias = module.exports;` can be removed.
                         foundImport = true;
                         return [];
                     }
-                    else if (ts.isRequireCall(initializer, true)) {
+                    else if (ts.isRequireCall(initializer, /*checkArgumentIsStringLiteralLike*/ true)) {
                         foundImport = true;
-                        return convertSingleImport(sourceFile, name, initializer.arguments[0], changes, checker, identifiers, target, preferences);
+                        return convertSingleImport(sourceFile, name, initializer.arguments[0], changes, checker, identifiers, target, quotePreference);
                     }
-                    else if (ts.isPropertyAccessExpression(initializer) && ts.isRequireCall(initializer.expression, true)) {
+                    else if (ts.isPropertyAccessExpression(initializer) && ts.isRequireCall(initializer.expression, /*checkArgumentIsStringLiteralLike*/ true)) {
                         foundImport = true;
-                        return convertPropertyAccessImport(name, initializer.name.text, initializer.expression.arguments[0], identifiers, preferences);
+                        return convertPropertyAccessImport(name, initializer.name.text, initializer.expression.arguments[0], identifiers, quotePreference);
                     }
                 }
-                return ts.createVariableStatement(undefined, ts.createVariableDeclarationList([decl], declarationList.flags));
+                // Move it out to its own variable statement. (This will not be used if `!foundImport`)
+                return ts.createVariableStatement(/*modifiers*/ undefined, ts.createVariableDeclarationList([decl], declarationList.flags));
             });
             if (foundImport) {
+                // useNonAdjustedEndPosition to ensure we don't eat the newline after the statement.
                 changes.replaceNodeWithNodes(sourceFile, statement, newNodes);
             }
         }
-        function convertPropertyAccessImport(name, propertyName, moduleSpecifier, identifiers, preferences) {
+        /** Converts `const name = require("moduleSpecifier").propertyName` */
+        function convertPropertyAccessImport(name, propertyName, moduleSpecifier, identifiers, quotePreference) {
             switch (name.kind) {
-                case 180:
-                case 181: {
+                case 180 /* ObjectBindingPattern */:
+                case 181 /* ArrayBindingPattern */: {
+                    // `const [a, b] = require("c").d` --> `import { d } from "c"; const [a, b] = d;`
                     var tmp = makeUniqueName(propertyName, identifiers);
                     return [
-                        makeSingleImport(tmp, propertyName, moduleSpecifier, preferences),
-                        makeConst(undefined, name, ts.createIdentifier(tmp)),
+                        makeSingleImport(tmp, propertyName, moduleSpecifier, quotePreference),
+                        makeConst(/*modifiers*/ undefined, name, ts.createIdentifier(tmp)),
                     ];
                 }
-                case 71:
-                    return [makeSingleImport(name.text, propertyName, moduleSpecifier, preferences)];
+                case 71 /* Identifier */:
+                    // `const a = require("b").c` --> `import { c as a } from "./b";
+                    return [makeSingleImport(name.text, propertyName, moduleSpecifier, quotePreference)];
                 default:
                     return ts.Debug.assertNever(name);
             }
@@ -84245,11 +102254,12 @@ var ts;
             }
             if (ts.isExportsOrModuleExportsOrAlias(sourceFile, left)) {
                 if (ts.isExportsOrModuleExportsOrAlias(sourceFile, right)) {
+                    // `const alias = module.exports;` or `module.exports = alias;` can be removed.
                     changes.deleteNode(sourceFile, assignment.parent);
                 }
                 else {
                     var replacement = ts.isObjectLiteralExpression(right) ? tryChangeModuleExportsObject(right)
-                        : ts.isRequireCall(right, true) ? convertReExportAll(right.arguments[0], checker)
+                        : ts.isRequireCall(right, /*checkArgumentIsStringLiteralLike*/ true) ? convertReExportAll(right.arguments[0], checker)
                             : undefined;
                     if (replacement) {
                         changes.replaceNodeWithNodes(sourceFile, assignment.parent, replacement[0]);
@@ -84266,18 +102276,23 @@ var ts;
             }
             return false;
         }
+        /**
+         * Convert `module.exports = { ... }` to individual exports..
+         * We can't always do this if the module has interesting members -- then it will be a default export instead.
+         */
         function tryChangeModuleExportsObject(object) {
             var statements = ts.mapAllOrFail(object.properties, function (prop) {
                 switch (prop.kind) {
-                    case 156:
-                    case 157:
-                    case 271:
-                    case 272:
+                    case 156 /* GetAccessor */:
+                    case 157 /* SetAccessor */:
+                    // TODO: Maybe we should handle this? See fourslash test `refactorConvertToEs6Module_export_object_shorthand.ts`.
+                    case 271 /* ShorthandPropertyAssignment */:
+                    case 272 /* SpreadAssignment */:
                         return undefined;
-                    case 270:
+                    case 270 /* PropertyAssignment */:
                         return !ts.isIdentifier(prop.name) ? undefined : convertExportsDotXEquals_replaceNode(prop.name.text, prop.initializer);
-                    case 154:
-                        return !ts.isIdentifier(prop.name) ? undefined : functionExpressionToDeclaration(prop.name.text, [ts.createToken(84)], prop);
+                    case 154 /* MethodDeclaration */:
+                        return !ts.isIdentifier(prop.name) ? undefined : functionExpressionToDeclaration(prop.name.text, [ts.createToken(84 /* ExportKeyword */)], prop);
                     default:
                         ts.Debug.assertNever(prop);
                 }
@@ -84285,11 +102300,16 @@ var ts;
             return statements && [statements, false];
         }
         function convertNamedExport(sourceFile, assignment, changes, exports) {
+            // If "originalKeywordKind" was set, this is e.g. `exports.
             var text = assignment.left.name.text;
             var rename = exports.get(text);
             if (rename !== undefined) {
+                /*
+                const _class = 0;
+                export { _class as class };
+                */
                 var newNodes = [
-                    makeConst(undefined, rename, assignment.right),
+                    makeConst(/*modifiers*/ undefined, rename, assignment.right),
                     makeExportDeclaration([ts.createExportSpecifier(rename, text)]),
                 ];
                 changes.replaceNodeWithNodes(sourceFile, assignment.parent, newNodes);
@@ -84299,6 +102319,7 @@ var ts;
             }
         }
         function convertReExportAll(reExported, checker) {
+            // `module.exports = require("x");` ==> `export * from "x"; export { default } from "x";`
             var moduleSpecifier = reExported.text;
             var moduleSymbol = checker.getSymbolAtLocation(reExported);
             var exports = moduleSymbol ? moduleSymbol.exports : ts.emptyUnderscoreEscapedMap;
@@ -84306,87 +102327,113 @@ var ts;
                 ? [[reExportDefault(moduleSpecifier)], true]
                 : !exports.has("default")
                     ? [[reExportStar(moduleSpecifier)], false]
+                    // If there's some non-default export, must include both `export *` and `export default`.
                     : exports.size > 1 ? [[reExportStar(moduleSpecifier), reExportDefault(moduleSpecifier)], true] : [[reExportDefault(moduleSpecifier)], true];
         }
         function reExportStar(moduleSpecifier) {
-            return makeExportDeclaration(undefined, moduleSpecifier);
+            return makeExportDeclaration(/*exportClause*/ undefined, moduleSpecifier);
         }
         function reExportDefault(moduleSpecifier) {
-            return makeExportDeclaration([ts.createExportSpecifier(undefined, "default")], moduleSpecifier);
+            return makeExportDeclaration([ts.createExportSpecifier(/*propertyName*/ undefined, "default")], moduleSpecifier);
         }
         function convertExportsPropertyAssignment(_a, sourceFile, changes) {
             var left = _a.left, right = _a.right, parent = _a.parent;
             var name = left.name.text;
             if ((ts.isFunctionExpression(right) || ts.isArrowFunction(right) || ts.isClassExpression(right)) && (!right.name || right.name.text === name)) {
-                changes.replaceRange(sourceFile, { pos: left.getStart(sourceFile), end: right.getStart(sourceFile) }, ts.createToken(84), { suffix: " " });
+                // `exports.f = function() {}` -> `export function f() {}` -- Replace `exports.f = ` with `export `, and insert the name after `function`.
+                changes.replaceRange(sourceFile, { pos: left.getStart(sourceFile), end: right.getStart(sourceFile) }, ts.createToken(84 /* ExportKeyword */), { suffix: " " });
                 if (!right.name)
                     changes.insertName(sourceFile, right, name);
-                var semi = ts.findChildOfKind(parent, 25, sourceFile);
+                var semi = ts.findChildOfKind(parent, 25 /* SemicolonToken */, sourceFile);
                 if (semi)
                     changes.deleteNode(sourceFile, semi, { useNonAdjustedEndPosition: true });
             }
             else {
-                changes.replaceNodeRangeWithNodes(sourceFile, left.expression, ts.findChildOfKind(left, 23, sourceFile), [ts.createToken(84), ts.createToken(76)], { joiner: " ", suffix: " " });
+                // `exports.f = function g() {}` -> `export const f = function g() {}` -- just replace `exports.` with `export const `
+                changes.replaceNodeRangeWithNodes(sourceFile, left.expression, ts.findChildOfKind(left, 23 /* DotToken */, sourceFile), [ts.createToken(84 /* ExportKeyword */), ts.createToken(76 /* ConstKeyword */)], { joiner: " ", suffix: " " });
             }
         }
+        // TODO: GH#22492 this will cause an error if a change has been made inside the body of the node.
         function convertExportsDotXEquals_replaceNode(name, exported) {
-            var modifiers = [ts.createToken(84)];
+            var modifiers = [ts.createToken(84 /* ExportKeyword */)];
             switch (exported.kind) {
-                case 192: {
+                case 192 /* FunctionExpression */: {
                     var expressionName = exported.name;
                     if (expressionName && expressionName.text !== name) {
+                        // `exports.f = function g() {}` -> `export const f = function g() {}`
                         return exportConst();
                     }
                 }
-                case 193:
+                // falls through
+                case 193 /* ArrowFunction */:
+                    // `exports.f = function() {}` --> `export function f() {}`
                     return functionExpressionToDeclaration(name, modifiers, exported);
-                case 205:
+                case 205 /* ClassExpression */:
+                    // `exports.C = class {}` --> `export class C {}`
                     return classExpressionToDeclaration(name, modifiers, exported);
                 default:
                     return exportConst();
             }
             function exportConst() {
-                return makeConst(modifiers, ts.createIdentifier(name), exported);
+                // `exports.x = 0;` --> `export const x = 0;`
+                return makeConst(modifiers, ts.createIdentifier(name), exported); // TODO: GH#18217
             }
         }
-        function convertSingleImport(file, name, moduleSpecifier, changes, checker, identifiers, target, preferences) {
+        /**
+         * Converts `const <<name>> = require("x");`.
+         * Returns nodes that will replace the variable declaration for the commonjs import.
+         * May also make use `changes` to remove qualifiers at the use sites of imports, to change `mod.x` to `x`.
+         */
+        function convertSingleImport(file, name, moduleSpecifier, changes, checker, identifiers, target, quotePreference) {
             switch (name.kind) {
-                case 180: {
+                case 180 /* ObjectBindingPattern */: {
                     var importSpecifiers = ts.mapAllOrFail(name.elements, function (e) {
                         return e.dotDotDotToken || e.initializer || e.propertyName && !ts.isIdentifier(e.propertyName) || !ts.isIdentifier(e.name)
                             ? undefined
                             : makeImportSpecifier(e.propertyName && e.propertyName.text, e.name.text);
-                    });
+                    }); // tslint:disable-line no-unnecessary-type-assertion (TODO: GH#18217)
                     if (importSpecifiers) {
-                        return [ts.makeImport(undefined, importSpecifiers, moduleSpecifier, preferences)];
+                        return [ts.makeImport(/*name*/ undefined, importSpecifiers, moduleSpecifier, quotePreference)];
                     }
                 }
-                case 181: {
+                // falls through -- object destructuring has an interesting pattern and must be a variable declaration
+                case 181 /* ArrayBindingPattern */: {
+                    /*
+                    import x from "x";
+                    const [a, b, c] = x;
+                    */
                     var tmp = makeUniqueName(codefix.moduleSpecifierToValidIdentifier(moduleSpecifier.text, target), identifiers);
                     return [
-                        ts.makeImport(ts.createIdentifier(tmp), undefined, moduleSpecifier, preferences),
-                        makeConst(undefined, ts.getSynthesizedDeepClone(name), ts.createIdentifier(tmp)),
+                        ts.makeImport(ts.createIdentifier(tmp), /*namedImports*/ undefined, moduleSpecifier, quotePreference),
+                        makeConst(/*modifiers*/ undefined, ts.getSynthesizedDeepClone(name), ts.createIdentifier(tmp)),
                     ];
                 }
-                case 71:
-                    return convertSingleIdentifierImport(file, name, moduleSpecifier, changes, checker, identifiers, preferences);
+                case 71 /* Identifier */:
+                    return convertSingleIdentifierImport(file, name, moduleSpecifier, changes, checker, identifiers, quotePreference);
                 default:
                     return ts.Debug.assertNever(name);
             }
         }
-        function convertSingleIdentifierImport(file, name, moduleSpecifier, changes, checker, identifiers, preferences) {
+        /**
+         * Convert `import x = require("x").`
+         * Also converts uses like `x.y()` to `y()` and uses a named import.
+         */
+        function convertSingleIdentifierImport(file, name, moduleSpecifier, changes, checker, identifiers, quotePreference) {
             var nameSymbol = checker.getSymbolAtLocation(name);
+            // Maps from module property name to name actually used. (The same if there isn't shadowing.)
             var namedBindingsNames = ts.createMap();
+            // True if there is some non-property use like `x()` or `f(x)`.
             var needDefaultImport = false;
             for (var _i = 0, _a = identifiers.original.get(name.text); _i < _a.length; _i++) {
                 var use = _a[_i];
                 if (checker.getSymbolAtLocation(use) !== nameSymbol || use === name) {
+                    // This was a use of a different symbol with the same name, due to shadowing. Ignore.
                     continue;
                 }
                 var parent = use.parent;
                 if (ts.isPropertyAccessExpression(parent)) {
                     var expression = parent.expression, propertyName = parent.name.text;
-                    ts.Debug.assert(expression === use);
+                    ts.Debug.assert(expression === use); // Else shouldn't have been in `collectIdentifiers`
                     var idName = namedBindingsNames.get(propertyName);
                     if (idName === undefined) {
                         idName = makeUniqueName(propertyName, identifiers);
@@ -84403,10 +102450,12 @@ var ts;
                 return ts.createImportSpecifier(propertyName === idName ? undefined : ts.createIdentifier(propertyName), ts.createIdentifier(idName));
             }));
             if (!namedBindings) {
+                // If it was unused, ensure that we at least import *something*.
                 needDefaultImport = true;
             }
-            return [ts.makeImport(needDefaultImport ? ts.getSynthesizedDeepClone(name) : undefined, namedBindings, moduleSpecifier, preferences)];
+            return [ts.makeImport(needDefaultImport ? ts.getSynthesizedDeepClone(name) : undefined, namedBindings, moduleSpecifier, quotePreference)];
         }
+        // Identifiers helpers
         function makeUniqueName(name, identifiers) {
             while (identifiers.original.has(name) || identifiers.additional.has(name)) {
                 name = "_" + name;
@@ -84419,6 +102468,10 @@ var ts;
             forEachFreeIdentifier(file, function (id) { return map.add(id.text, id); });
             return map;
         }
+        /**
+         * A free identifier is an identifier that can be accessed through name lookup as a local variable.
+         * In the expression `x.y`, `x` is a free identifier, but `y` is not.
+         */
         function forEachFreeIdentifier(node, cb) {
             if (ts.isIdentifier(node) && isFreeIdentifier(node))
                 cb(node);
@@ -84427,38 +102480,44 @@ var ts;
         function isFreeIdentifier(node) {
             var parent = node.parent;
             switch (parent.kind) {
-                case 185:
+                case 185 /* PropertyAccessExpression */:
                     return parent.name !== node;
-                case 182:
+                case 182 /* BindingElement */:
                     return parent.propertyName !== node;
-                case 248:
+                case 248 /* ImportSpecifier */:
                     return parent.propertyName !== node;
                 default:
                     return true;
             }
         }
+        // Node helpers
         function functionExpressionToDeclaration(name, additionalModifiers, fn) {
-            return ts.createFunctionDeclaration(ts.getSynthesizedDeepClones(fn.decorators), ts.concatenate(additionalModifiers, ts.getSynthesizedDeepClones(fn.modifiers)), ts.getSynthesizedDeepClone(fn.asteriskToken), name, ts.getSynthesizedDeepClones(fn.typeParameters), ts.getSynthesizedDeepClones(fn.parameters), ts.getSynthesizedDeepClone(fn.type), ts.convertToFunctionBody(ts.getSynthesizedDeepClone(fn.body)));
+            return ts.createFunctionDeclaration(ts.getSynthesizedDeepClones(fn.decorators), // TODO: GH#19915 Don't think this is even legal.
+            ts.concatenate(additionalModifiers, ts.getSynthesizedDeepClones(fn.modifiers)), ts.getSynthesizedDeepClone(fn.asteriskToken), name, ts.getSynthesizedDeepClones(fn.typeParameters), ts.getSynthesizedDeepClones(fn.parameters), ts.getSynthesizedDeepClone(fn.type), ts.convertToFunctionBody(ts.getSynthesizedDeepClone(fn.body)));
         }
         function classExpressionToDeclaration(name, additionalModifiers, cls) {
-            return ts.createClassDeclaration(ts.getSynthesizedDeepClones(cls.decorators), ts.concatenate(additionalModifiers, ts.getSynthesizedDeepClones(cls.modifiers)), name, ts.getSynthesizedDeepClones(cls.typeParameters), ts.getSynthesizedDeepClones(cls.heritageClauses), ts.getSynthesizedDeepClones(cls.members));
+            return ts.createClassDeclaration(ts.getSynthesizedDeepClones(cls.decorators), // TODO: GH#19915 Don't think this is even legal.
+            ts.concatenate(additionalModifiers, ts.getSynthesizedDeepClones(cls.modifiers)), name, ts.getSynthesizedDeepClones(cls.typeParameters), ts.getSynthesizedDeepClones(cls.heritageClauses), ts.getSynthesizedDeepClones(cls.members));
         }
-        function makeSingleImport(localName, propertyName, moduleSpecifier, preferences) {
+        function makeSingleImport(localName, propertyName, moduleSpecifier, quotePreference) {
             return propertyName === "default"
-                ? ts.makeImport(ts.createIdentifier(localName), undefined, moduleSpecifier, preferences)
-                : ts.makeImport(undefined, [makeImportSpecifier(propertyName, localName)], moduleSpecifier, preferences);
+                ? ts.makeImport(ts.createIdentifier(localName), /*namedImports*/ undefined, moduleSpecifier, quotePreference)
+                : ts.makeImport(/*name*/ undefined, [makeImportSpecifier(propertyName, localName)], moduleSpecifier, quotePreference);
         }
         function makeImportSpecifier(propertyName, name) {
             return ts.createImportSpecifier(propertyName !== undefined && propertyName !== name ? ts.createIdentifier(propertyName) : undefined, ts.createIdentifier(name));
         }
         function makeConst(modifiers, name, init) {
-            return ts.createVariableStatement(modifiers, ts.createVariableDeclarationList([ts.createVariableDeclaration(name, undefined, init)], 2));
+            return ts.createVariableStatement(modifiers, ts.createVariableDeclarationList([ts.createVariableDeclaration(name, /*type*/ undefined, init)], 2 /* Const */));
         }
         function makeExportDeclaration(exportSpecifiers, moduleSpecifier) {
-            return ts.createExportDeclaration(undefined, undefined, exportSpecifiers && ts.createNamedExports(exportSpecifiers), moduleSpecifier === undefined ? undefined : ts.createLiteral(moduleSpecifier));
+            return ts.createExportDeclaration(
+            /*decorators*/ undefined, 
+            /*modifiers*/ undefined, exportSpecifiers && ts.createNamedExports(exportSpecifiers), moduleSpecifier === undefined ? undefined : ts.createLiteral(moduleSpecifier));
         }
     })(codefix = ts.codefix || (ts.codefix = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var codefix;
@@ -84484,24 +102543,25 @@ var ts;
             }); },
         });
         function getQualifiedName(sourceFile, pos) {
-            var qualifiedName = ts.findAncestor(ts.getTokenAtPosition(sourceFile, pos, true), ts.isQualifiedName);
+            var qualifiedName = ts.findAncestor(ts.getTokenAtPosition(sourceFile, pos, /*includeJsDocComment*/ true), ts.isQualifiedName);
             ts.Debug.assert(!!qualifiedName, "Expected position to be owned by a qualified name.");
             return ts.isIdentifier(qualifiedName.left) ? qualifiedName : undefined;
         }
         function doChange(changeTracker, sourceFile, qualifiedName) {
             var rightText = qualifiedName.right.text;
-            var replacement = ts.createIndexedAccessTypeNode(ts.createTypeReferenceNode(qualifiedName.left, undefined), ts.createLiteralTypeNode(ts.createLiteral(rightText)));
+            var replacement = ts.createIndexedAccessTypeNode(ts.createTypeReferenceNode(qualifiedName.left, /*typeArguments*/ undefined), ts.createLiteralTypeNode(ts.createLiteral(rightText)));
             changeTracker.replaceNode(sourceFile, qualifiedName, replacement);
         }
     })(codefix = ts.codefix || (ts.codefix = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var codefix;
     (function (codefix) {
         var errorCodes = [ts.Diagnostics.Class_0_incorrectly_implements_interface_1.code,
             ts.Diagnostics.Class_0_incorrectly_implements_class_1_Did_you_mean_to_extend_1_and_inherit_its_members_as_a_subclass.code];
-        var fixId = "fixClassIncorrectlyImplementsInterface";
+        var fixId = "fixClassIncorrectlyImplementsInterface"; // TODO: share a group with fixClassDoesntImplementInheritedAbstractMember?
         codefix.registerCodeFix({
             errorCodes: errorCodes,
             getCodeActions: function (context) {
@@ -84528,22 +102588,24 @@ var ts;
             },
         });
         function getClass(sourceFile, pos) {
-            return ts.Debug.assertDefined(ts.getContainingClass(ts.getTokenAtPosition(sourceFile, pos, false)));
+            return ts.Debug.assertDefined(ts.getContainingClass(ts.getTokenAtPosition(sourceFile, pos, /*includeJsDocComment*/ false)));
         }
         function symbolPointsToNonPrivateMember(symbol) {
-            return !(ts.getModifierFlags(symbol.valueDeclaration) & 8);
+            return !(ts.getModifierFlags(symbol.valueDeclaration) & 8 /* Private */);
         }
         function addMissingDeclarations(checker, implementedTypeNode, sourceFile, classDeclaration, changeTracker, preferences) {
             var maybeHeritageClauseSymbol = getHeritageClauseSymbolTable(classDeclaration, checker);
+            // Note that this is ultimately derived from a map indexed by symbol names,
+            // so duplicates cannot occur.
             var implementedType = checker.getTypeAtLocation(implementedTypeNode);
             var implementedTypeSymbols = checker.getPropertiesOfType(implementedType);
             var nonPrivateAndNotExistedInHeritageClauseMembers = implementedTypeSymbols.filter(ts.and(symbolPointsToNonPrivateMember, function (symbol) { return !maybeHeritageClauseSymbol.has(symbol.escapedName); }));
             var classType = checker.getTypeAtLocation(classDeclaration);
             if (!classType.getNumberIndexType()) {
-                createMissingIndexSignatureDeclaration(implementedType, 1);
+                createMissingIndexSignatureDeclaration(implementedType, 1 /* Number */);
             }
             if (!classType.getStringIndexType()) {
-                createMissingIndexSignatureDeclaration(implementedType, 0);
+                createMissingIndexSignatureDeclaration(implementedType, 0 /* String */);
             }
             codefix.createMissingMemberNodes(classDeclaration, nonPrivateAndNotExistedInHeritageClauseMembers, checker, preferences, function (member) { return changeTracker.insertNodeAtClassStart(sourceFile, classDeclaration, member); });
             function createMissingIndexSignatureDeclaration(type, kind) {
@@ -84563,6 +102625,7 @@ var ts;
         }
     })(codefix = ts.codefix || (ts.codefix = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var codefix;
@@ -84579,10 +102642,12 @@ var ts;
             getCodeActions: function (context) { return context.errorCode === ts.Diagnostics._0_refers_to_a_UMD_global_but_the_current_file_is_a_module_Consider_adding_an_import_instead.code
                 ? getActionsForUMDImport(context)
                 : getActionsForNonUMDImport(context); },
+            // TODO: GH#20315
             fixIds: [],
             getAllCodeActions: ts.notImplemented,
         });
         function createCodeAction(descriptionDiagnostic, diagnosticArgs, changes) {
+            // TODO: GH#20315
             return codefix.createCodeFixActionNoFixId("import", changes, [descriptionDiagnostic].concat(diagnosticArgs));
         }
         function convertToImportCodeFixContext(context, symbolToken, symbolName) {
@@ -84611,6 +102676,7 @@ var ts;
         function getImportCompletionAction(exportedSymbol, moduleSymbol, sourceFile, symbolName, host, program, checker, compilerOptions, allSourceFiles, formatContext, getCanonicalFileName, symbolToken, preferences) {
             var exportInfos = getAllReExportingModules(exportedSymbol, moduleSymbol, symbolName, sourceFile, checker, allSourceFiles);
             ts.Debug.assert(exportInfos.some(function (info) { return info.moduleSymbol === moduleSymbol; }));
+            // We sort the best codefixes first, so taking `first` is best for completions.
             var moduleSpecifier = ts.first(getNewImportInfos(program, sourceFile, exportInfos, host, preferences)).moduleSpecifier;
             var ctx = { host: host, program: program, checker: checker, compilerOptions: compilerOptions, sourceFile: sourceFile, formatContext: formatContext, symbolName: symbolName, getCanonicalFileName: getCanonicalFileName, symbolToken: symbolToken, preferences: preferences };
             return { moduleSpecifier: moduleSpecifier, codeAction: ts.first(getCodeActionsForImport(exportInfos, ctx)) };
@@ -84619,14 +102685,15 @@ var ts;
         function getAllReExportingModules(exportedSymbol, exportingModuleSymbol, symbolName, sourceFile, checker, allSourceFiles) {
             var result = [];
             forEachExternalModule(checker, allSourceFiles, function (moduleSymbol, moduleFile) {
+                // Don't import from a re-export when looking "up" like to `./index` or `../index`.
                 if (moduleFile && moduleSymbol !== exportingModuleSymbol && ts.startsWith(sourceFile.fileName, ts.getDirectoryPath(moduleFile.fileName))) {
                     return;
                 }
                 for (var _i = 0, _a = checker.getExportsOfModule(moduleSymbol); _i < _a.length; _i++) {
                     var exported = _a[_i];
-                    if ((exported.escapedName === "default" || exported.name === symbolName) && ts.skipAlias(exported, checker) === exportedSymbol) {
-                        var isDefaultExport = checker.tryGetMemberInModuleExports("default", moduleSymbol) === exported;
-                        result.push({ moduleSymbol: moduleSymbol, importKind: isDefaultExport ? 1 : 0 });
+                    if ((exported.escapedName === "default" /* Default */ || exported.name === symbolName) && ts.skipAlias(exported, checker) === exportedSymbol) {
+                        var isDefaultExport = checker.tryGetMemberInModuleExports("default" /* Default */, moduleSymbol) === exported;
+                        result.push({ moduleSymbol: moduleSymbol, importKind: isDefaultExport ? 1 /* Default */ : 0 /* Named */ });
                     }
                 }
             });
@@ -84644,11 +102711,23 @@ var ts;
             if (addToExisting) {
                 useExisting.push(addToExisting);
             }
-            else {
+            else { // Don't bother providing an action to add a new import if we can add to an existing one.
                 getCodeActionsForAddImport(exportInfos, context, existingImports, addNew);
             }
         }
         function tryUseExistingNamespaceImport(existingImports, context, symbolToken, checker) {
+            // It is possible that multiple import statements with the same specifier exist in the file.
+            // e.g.
+            //
+            //     import * as ns from "foo";
+            //     import { member1, member2 } from "foo";
+            //
+            //     member3/**/ <-- cusor here
+            //
+            // in this case we should provie 2 actions:
+            //     1. change "member3" to "ns.member3"
+            //     2. add "member3" to the second import statement's import list
+            // and it is up to the user to decide which one fits best.
             return !symbolToken || !ts.isIdentifier(symbolToken) ? undefined : ts.firstDefined(existingImports, function (_a) {
                 var declaration = _a.declaration;
                 var namespace = getNamespaceImportName(declaration);
@@ -84663,7 +102742,7 @@ var ts;
         function tryAddToExistingImport(existingImports, context) {
             return ts.firstDefined(existingImports, function (_a) {
                 var declaration = _a.declaration, importKind = _a.importKind;
-                if (declaration.kind === 244 && declaration.importClause) {
+                if (declaration.kind === 244 /* ImportDeclaration */ && declaration.importClause) {
                     var changes = tryUpdateExistingImport(context, declaration.importClause, importKind);
                     if (changes) {
                         var moduleSpecifierWithoutQuotes = ts.stripQuotes(declaration.moduleSpecifier.getText());
@@ -84673,9 +102752,9 @@ var ts;
             });
         }
         function getNamespaceImportName(declaration) {
-            if (declaration.kind === 244) {
+            if (declaration.kind === 244 /* ImportDeclaration */) {
                 var namedBindings = declaration.importClause && ts.isImportClause(declaration.importClause) && declaration.importClause.namedBindings;
-                return namedBindings && namedBindings.kind === 246 ? namedBindings.name : undefined;
+                return namedBindings && namedBindings.kind === 246 /* NamespaceImport */ ? namedBindings.name : undefined;
             }
             else {
                 return declaration.name;
@@ -84686,7 +102765,7 @@ var ts;
             var imports = _b.imports;
             return ts.mapDefined(imports, function (moduleSpecifier) {
                 var i = ts.importFromModuleSpecifier(moduleSpecifier);
-                return (i.kind === 244 || i.kind === 243)
+                return (i.kind === 244 /* ImportDeclaration */ || i.kind === 243 /* ImportEqualsDeclaration */)
                     && checker.getSymbolAtLocation(moduleSpecifier) === moduleSymbol ? { declaration: i, importKind: importKind } : undefined;
             });
         }
@@ -84695,38 +102774,36 @@ var ts;
             var sourceFile = context.sourceFile, symbolName = context.symbolName, preferences = context.preferences;
             var lastImportDeclaration = ts.findLast(sourceFile.statements, ts.isAnyImportSyntax);
             var moduleSpecifierWithoutQuotes = ts.stripQuotes(moduleSpecifier);
-            var quotedModuleSpecifier = ts.createLiteral(moduleSpecifierWithoutQuotes, shouldUseSingleQuote(sourceFile, preferences));
-            var importDecl = importKind !== 3
-                ? ts.createImportDeclaration(undefined, undefined, createImportClauseOfKind(importKind, symbolName), quotedModuleSpecifier)
-                : ts.createImportEqualsDeclaration(undefined, undefined, ts.createIdentifier(symbolName), ts.createExternalModuleReference(quotedModuleSpecifier));
+            var quotedModuleSpecifier = ts.makeStringLiteral(moduleSpecifierWithoutQuotes, ts.getQuotePreference(sourceFile, preferences));
+            var importDecl = importKind !== 3 /* Equals */
+                ? ts.createImportDeclaration(
+                /*decorators*/ undefined, 
+                /*modifiers*/ undefined, createImportClauseOfKind(importKind, symbolName), quotedModuleSpecifier)
+                : ts.createImportEqualsDeclaration(
+                /*decorators*/ undefined, 
+                /*modifiers*/ undefined, ts.createIdentifier(symbolName), ts.createExternalModuleReference(quotedModuleSpecifier));
             var changes = ChangeTracker.with(context, function (changeTracker) {
                 if (lastImportDeclaration) {
                     changeTracker.insertNodeAfter(sourceFile, lastImportDeclaration, importDecl);
                 }
                 else {
-                    changeTracker.insertNodeAtTopOfFile(sourceFile, importDecl, true);
+                    changeTracker.insertNodeAtTopOfFile(sourceFile, importDecl, /*blankLineBetween*/ true);
                 }
             });
+            // if this file doesn't have any import statements, insert an import statement and then insert a new line
+            // between the only import statement and user code. Otherwise just insert the statement because chances
+            // are there are already a new line separating code and import statements.
             return createCodeAction(ts.Diagnostics.Import_0_from_module_1, [symbolName, moduleSpecifierWithoutQuotes], changes);
         }
-        function shouldUseSingleQuote(sourceFile, preferences) {
-            if (preferences.quotePreference) {
-                return preferences.quotePreference === "single";
-            }
-            else {
-                var firstModuleSpecifier = ts.firstOrUndefined(sourceFile.imports);
-                return !!firstModuleSpecifier && !ts.isStringDoubleQuoted(firstModuleSpecifier, sourceFile);
-            }
-        }
         function createImportClauseOfKind(kind, symbolName) {
             var id = ts.createIdentifier(symbolName);
             switch (kind) {
-                case 1:
-                    return ts.createImportClause(id, undefined);
-                case 2:
-                    return ts.createImportClause(undefined, ts.createNamespaceImport(id));
-                case 0:
-                    return ts.createImportClause(undefined, ts.createNamedImports([ts.createImportSpecifier(undefined, id)]));
+                case 1 /* Default */:
+                    return ts.createImportClause(id, /*namedBindings*/ undefined);
+                case 2 /* Namespace */:
+                    return ts.createImportClause(/*name*/ undefined, ts.createNamespaceImport(id));
+                case 0 /* Named */:
+                    return ts.createImportClause(/*name*/ undefined, ts.createNamedImports([ts.createImportSpecifier(/*propertyName*/ undefined, id)]));
                 default:
                     ts.Debug.assertNever(kind);
             }
@@ -84737,6 +102814,7 @@ var ts;
                 var modulePathsGroups = ts.moduleSpecifiers.getModuleSpecifiers(moduleSymbol, program, sourceFile, host, preferences);
                 return modulePathsGroups.map(function (group) { return group.map(function (moduleSpecifier) { return ({ moduleSpecifier: moduleSpecifier, importKind: importKind }); }); });
             });
+            // Sort to keep the shortest paths first, but keep [relativePath, importRelativeToBaseUrl] groups together
             return ts.flatten(choicesForEachExportingModule.sort(function (a, b) { return ts.first(a).moduleSpecifier.length - ts.first(b).moduleSpecifier.length; }));
         }
         function getCodeActionsForAddImport(exportInfos, ctx, existingImports, addNew) {
@@ -84751,9 +102829,9 @@ var ts;
         }
         function newImportInfoFromExistingSpecifier(_a) {
             var declaration = _a.declaration, importKind = _a.importKind;
-            var expression = declaration.kind === 244
+            var expression = declaration.kind === 244 /* ImportDeclaration */
                 ? declaration.moduleSpecifier
-                : declaration.moduleReference.kind === 254
+                : declaration.moduleReference.kind === 254 /* ExternalModuleReference */
                     ? declaration.moduleReference.expression
                     : undefined;
             return expression && ts.isStringLiteral(expression) ? { moduleSpecifier: expression.text, importKind: importKind } : undefined;
@@ -84761,29 +102839,30 @@ var ts;
         function tryUpdateExistingImport(context, importClause, importKind) {
             var symbolName = context.symbolName, sourceFile = context.sourceFile;
             var name = importClause.name;
-            var namedBindings = (importClause.kind !== 243 && importClause).namedBindings;
+            var namedBindings = (importClause.kind !== 243 /* ImportEqualsDeclaration */ && importClause).namedBindings; // TODO: GH#18217
             switch (importKind) {
-                case 1:
+                case 1 /* Default */:
                     return name ? undefined : ChangeTracker.with(context, function (t) {
                         return t.replaceNode(sourceFile, importClause, ts.createImportClause(ts.createIdentifier(symbolName), namedBindings));
                     });
-                case 0: {
-                    var newImportSpecifier_1 = ts.createImportSpecifier(undefined, ts.createIdentifier(symbolName));
-                    if (namedBindings && namedBindings.kind === 247 && namedBindings.elements.length !== 0) {
+                case 0 /* Named */: {
+                    var newImportSpecifier_1 = ts.createImportSpecifier(/*propertyName*/ undefined, ts.createIdentifier(symbolName));
+                    if (namedBindings && namedBindings.kind === 247 /* NamedImports */ && namedBindings.elements.length !== 0) {
+                        // There are already named imports; add another.
                         return ChangeTracker.with(context, function (t) { return t.insertNodeInListAfter(sourceFile, namedBindings.elements[namedBindings.elements.length - 1], newImportSpecifier_1); });
                     }
-                    if (!namedBindings || namedBindings.kind === 247 && namedBindings.elements.length === 0) {
+                    if (!namedBindings || namedBindings.kind === 247 /* NamedImports */ && namedBindings.elements.length === 0) {
                         return ChangeTracker.with(context, function (t) {
                             return t.replaceNode(sourceFile, importClause, ts.createImportClause(name, ts.createNamedImports([newImportSpecifier_1])));
                         });
                     }
                     return undefined;
                 }
-                case 2:
+                case 2 /* Namespace */:
                     return namedBindings ? undefined : ChangeTracker.with(context, function (t) {
                         return t.replaceNode(sourceFile, importClause, ts.createImportClause(name, ts.createNamespaceImport(ts.createIdentifier(symbolName))));
                     });
-                case 3:
+                case 3 /* Equals */:
                     return undefined;
                 default:
                     ts.Debug.assertNever(importKind);
@@ -84791,23 +102870,35 @@ var ts;
         }
         function getCodeActionForUseExistingNamespaceImport(namespacePrefix, context, symbolToken) {
             var symbolName = context.symbolName, sourceFile = context.sourceFile;
+            /**
+             * Cases:
+             *     import * as ns from "mod"
+             *     import default, * as ns from "mod"
+             *     import ns = require("mod")
+             *
+             * Because there is no import list, we alter the reference to include the
+             * namespace instead of altering the import declaration. For example, "foo" would
+             * become "ns.foo"
+             */
             var changes = ChangeTracker.with(context, function (tracker) {
                 return tracker.replaceNode(sourceFile, symbolToken, ts.createPropertyAccess(ts.createIdentifier(namespacePrefix), symbolToken));
             });
             return createCodeAction(ts.Diagnostics.Change_0_to_1, [symbolName, namespacePrefix + "." + symbolName], changes);
         }
         function getActionsForUMDImport(context) {
-            var token = ts.getTokenAtPosition(context.sourceFile, context.span.start, false);
+            var token = ts.getTokenAtPosition(context.sourceFile, context.span.start, /*includeJsDocComment*/ false);
             var checker = context.program.getTypeChecker();
             var umdSymbol;
             if (ts.isIdentifier(token)) {
+                // try the identifier to see if it is the umd symbol
                 umdSymbol = checker.getSymbolAtLocation(token);
             }
             if (!ts.isUMDExportSymbol(umdSymbol)) {
+                // The error wasn't for the symbolAtLocation, it was for the JSX tag itself, which needs access to e.g. `React`.
                 var parent = token.parent;
                 var isNodeOpeningLikeElement = ts.isJsxOpeningLikeElement(parent);
-                if ((ts.isJsxOpeningLikeElement && parent.tagName === token) || parent.kind === 260) {
-                    umdSymbol = checker.resolveName(checker.getJsxNamespace(parent), isNodeOpeningLikeElement ? parent.tagName : parent, 67216319, false);
+                if ((ts.isJsxOpeningLikeElement && parent.tagName === token) || parent.kind === 260 /* JsxOpeningFragment */) {
+                    umdSymbol = checker.resolveName(checker.getJsxNamespace(parent), isNodeOpeningLikeElement ? parent.tagName : parent, 67216319 /* Value */, /*excludeGlobals*/ false);
                 }
             }
             if (ts.isUMDExportSymbol(umdSymbol)) {
@@ -84819,35 +102910,41 @@ var ts;
             return undefined;
         }
         function getUmdImportKind(compilerOptions) {
+            // Import a synthetic `default` if enabled.
             if (ts.getAllowSyntheticDefaultImports(compilerOptions)) {
-                return 1;
+                return 1 /* Default */;
             }
+            // When a synthetic `default` is unavailable, use `import..require` if the module kind supports it.
             var moduleKind = ts.getEmitModuleKind(compilerOptions);
             switch (moduleKind) {
                 case ts.ModuleKind.AMD:
                 case ts.ModuleKind.CommonJS:
                 case ts.ModuleKind.UMD:
-                    return 3;
+                    return 3 /* Equals */;
                 case ts.ModuleKind.System:
                 case ts.ModuleKind.ES2015:
                 case ts.ModuleKind.ESNext:
                 case ts.ModuleKind.None:
-                    return 2;
+                    // Fall back to the `import * as ns` style import.
+                    return 2 /* Namespace */;
                 default:
                     return ts.Debug.assertNever(moduleKind);
             }
         }
         function getActionsForNonUMDImport(context) {
+            // This will always be an Identifier, since the diagnostics we fix only fail on identifiers.
             var sourceFile = context.sourceFile, span = context.span, program = context.program, cancellationToken = context.cancellationToken;
             var checker = program.getTypeChecker();
-            var symbolToken = ts.getTokenAtPosition(sourceFile, span.start, false);
+            var symbolToken = ts.getTokenAtPosition(sourceFile, span.start, /*includeJsDocComment*/ false);
+            // If we're at `<Foo/>`, we must check if `Foo` is already in scope, and if so, get an import for `React` instead.
             var symbolName = ts.isJsxOpeningLikeElement(symbolToken.parent)
                 && symbolToken.parent.tagName === symbolToken
-                && (!ts.isIdentifier(symbolToken) || ts.isIntrinsicJsxName(symbolToken.text) || checker.resolveName(symbolToken.text, symbolToken, 67108863, false))
+                && (!ts.isIdentifier(symbolToken) || ts.isIntrinsicJsxName(symbolToken.text) || checker.resolveName(symbolToken.text, symbolToken, 67108863 /* All */, /*excludeGlobals*/ false))
                 ? checker.getJsxNamespace()
                 : ts.isIdentifier(symbolToken) ? symbolToken.text : undefined;
             if (!symbolName)
                 return undefined;
+            // "default" is a keyword and not a legal identifier for the import, so we don't expect it here
             ts.Debug.assert(symbolName !== "default");
             var addToExistingDeclaration = [];
             var addNewDeclaration = [];
@@ -84857,24 +102954,28 @@ var ts;
             return addToExistingDeclaration.concat(addNewDeclaration);
         }
         function getExportInfos(symbolName, currentTokenMeaning, cancellationToken, sourceFile, checker, program) {
+            // For each original symbol, keep all re-exports of that symbol together so we can call `getCodeActionsForImport` on the whole group at once.
+            // Maps symbol id to info for modules providing that symbol (original export + re-exports).
             var originalSymbolToExportInfos = ts.createMultiMap();
             function addSymbol(moduleSymbol, exportedSymbol, importKind) {
                 originalSymbolToExportInfos.add(ts.getUniqueSymbolId(exportedSymbol, checker).toString(), { moduleSymbol: moduleSymbol, importKind: importKind });
             }
             forEachExternalModuleToImportFrom(checker, sourceFile, program.getSourceFiles(), function (moduleSymbol) {
                 cancellationToken.throwIfCancellationRequested();
-                var defaultExport = checker.tryGetMemberInModuleExports("default", moduleSymbol);
+                // check the default export
+                var defaultExport = checker.tryGetMemberInModuleExports("default" /* Default */, moduleSymbol);
                 if (defaultExport) {
                     var localSymbol = ts.getLocalSymbolForExportDefault(defaultExport);
                     if ((localSymbol && localSymbol.escapedName === symbolName ||
                         getEscapedNameForExportDefault(defaultExport) === symbolName ||
                         moduleSymbolToValidIdentifier(moduleSymbol, program.getCompilerOptions().target) === symbolName) && checkSymbolHasMeaning(localSymbol || defaultExport, currentTokenMeaning)) {
-                        addSymbol(moduleSymbol, localSymbol || defaultExport, 1);
+                        addSymbol(moduleSymbol, localSymbol || defaultExport, 1 /* Default */);
                     }
                 }
+                // check exports with the same name
                 var exportSymbolWithIdenticalName = checker.tryGetMemberInModuleExportsAndProperties(symbolName, moduleSymbol);
                 if (exportSymbolWithIdenticalName && checkSymbolHasMeaning(exportSymbolWithIdenticalName, currentTokenMeaning)) {
-                    addSymbol(moduleSymbol, exportSymbolWithIdenticalName, 0);
+                    addSymbol(moduleSymbol, exportSymbolWithIdenticalName, 0 /* Named */);
                 }
                 function getEscapedNameForExportDefault(symbol) {
                     return symbol.declarations && ts.firstDefined(symbol.declarations, function (declaration) {
@@ -84884,7 +102985,7 @@ var ts;
                             }
                         }
                         else if (ts.isExportSpecifier(declaration)) {
-                            ts.Debug.assert(declaration.name.escapedText === "default");
+                            ts.Debug.assert(declaration.name.escapedText === "default" /* Default */);
                             return declaration.propertyName && declaration.propertyName.escapedText;
                         }
                     });
@@ -84907,7 +103008,7 @@ var ts;
         function forEachExternalModule(checker, allSourceFiles, cb) {
             for (var _i = 0, _a = checker.getAmbientModules(); _i < _a.length; _i++) {
                 var ambient = _a[_i];
-                cb(ambient, undefined);
+                cb(ambient, /*sourceFile*/ undefined);
             }
             for (var _b = 0, allSourceFiles_1 = allSourceFiles; _b < allSourceFiles_1.length; _b++) {
                 var sourceFile = allSourceFiles_1[_b];
@@ -84916,7 +103017,12 @@ var ts;
                 }
             }
         }
+        /**
+         * Don't include something from a `node_modules` that isn't actually reachable by a global import.
+         * A relative import to node_modules is usually a bad idea.
+         */
         function isImportablePath(fromPath, toPath) {
+            // If it's in a `node_modules` but is not reachable from here via a global import, don't bother.
             var toNodeModules = ts.forEachAncestorDirectory(toPath, function (ancestor) { return ts.getBaseFileName(ancestor) === "node_modules" ? ancestor : undefined; });
             return toNodeModules === undefined || ts.startsWith(fromPath, ts.getDirectoryPath(toNodeModules));
         }
@@ -84947,11 +103053,13 @@ var ts;
                 }
                 lastCharWasValid = isValid;
             }
+            // Need `|| "_"` to ensure result isn't empty.
             return !ts.isStringANonContextualKeyword(res) ? res || "_" : "_" + res;
         }
         codefix.moduleSpecifierToValidIdentifier = moduleSpecifierToValidIdentifier;
     })(codefix = ts.codefix || (ts.codefix = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var codefix;
@@ -84983,16 +103091,19 @@ var ts;
             }); },
         });
         function getInfo(sourceFile, pos, context) {
-            var node = ts.getTokenAtPosition(sourceFile, pos, false);
+            // This is the identifier of the misspelled word. eg:
+            // this.speling = 1;
+            //      ^^^^^^^
+            var node = ts.getTokenAtPosition(sourceFile, pos, /*includeJsDocComment*/ false); // TODO: GH#15852
             var checker = context.program.getTypeChecker();
             var suggestion;
             if (ts.isPropertyAccessExpression(node.parent) && node.parent.name === node) {
-                ts.Debug.assert(node.kind === 71);
+                ts.Debug.assert(node.kind === 71 /* Identifier */);
                 var containingType = checker.getTypeAtLocation(node.parent.expression);
                 suggestion = checker.getSuggestionForNonexistentProperty(node, containingType);
             }
             else if (ts.isImportSpecifier(node.parent) && node.parent.name === node) {
-                ts.Debug.assert(node.kind === 71);
+                ts.Debug.assert(node.kind === 71 /* Identifier */);
                 var importDeclaration = ts.findAncestor(node, ts.isImportDeclaration);
                 var resolvedSourceFile = getResolvedSourceFileFromImportDeclaration(sourceFile, context, importDeclaration);
                 if (resolvedSourceFile && resolvedSourceFile.symbol) {
@@ -85017,14 +103128,14 @@ var ts;
         }
         function convertSemanticMeaningToSymbolFlags(meaning) {
             var flags = 0;
-            if (meaning & 4) {
-                flags |= 1920;
+            if (meaning & 4 /* Namespace */) {
+                flags |= 1920 /* Namespace */;
             }
-            if (meaning & 2) {
-                flags |= 67901928;
+            if (meaning & 2 /* Type */) {
+                flags |= 67901928 /* Type */;
             }
-            if (meaning & 1) {
-                flags |= 67216319;
+            if (meaning & 1 /* Value */) {
+                flags |= 67216319 /* Value */;
             }
             return flags;
         }
@@ -85038,6 +103149,7 @@ var ts;
         }
     })(codefix = ts.codefix || (ts.codefix = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var codefix;
@@ -85073,6 +103185,7 @@ var ts;
                     if (!ts.addToSeen(seenNames, token.text)) {
                         return;
                     }
+                    // Always prefer to add a method declaration if possible.
                     if (call) {
                         addMethodDeclaration(changes, classDeclarationSourceFile, classDeclaration, token, call, makeStatic, inJs, preferences);
                     }
@@ -85089,7 +103202,10 @@ var ts;
             },
         });
         function getInfo(tokenSourceFile, tokenPos, checker) {
-            var token = ts.getTokenAtPosition(tokenSourceFile, tokenPos, false);
+            // The identifier of the missing property. eg:
+            // this.missing = 1;
+            //      ^^^^^^^
+            var token = ts.getTokenAtPosition(tokenSourceFile, tokenPos, /*includeJsDocComment*/ false);
             if (!ts.isIdentifier(token)) {
                 return undefined;
             }
@@ -85114,7 +103230,7 @@ var ts;
         }
         function addMissingMemberInJs(changeTracker, classDeclarationSourceFile, classDeclaration, tokenName, makeStatic) {
             if (makeStatic) {
-                if (classDeclaration.kind === 205) {
+                if (classDeclaration.kind === 205 /* ClassExpression */) {
                     return;
                 }
                 var className = classDeclaration.name.getText();
@@ -85140,20 +103256,24 @@ var ts;
         }
         function getTypeNode(checker, classDeclaration, token) {
             var typeNode;
-            if (token.parent.parent.kind === 200) {
+            if (token.parent.parent.kind === 200 /* BinaryExpression */) {
                 var binaryExpression = token.parent.parent;
                 var otherExpression = token.parent === binaryExpression.left ? binaryExpression.right : binaryExpression.left;
-                var widenedType = checker.getWidenedType(checker.getBaseTypeOfLiteralType(checker.getTypeAtLocation(otherExpression)));
+                var widenedType = checker.getWidenedType(checker.getBaseTypeOfLiteralType(checker.getTypeAtLocation(otherExpression))); // TODO: GH#18217
                 typeNode = checker.typeToTypeNode(widenedType, classDeclaration);
             }
-            return typeNode || ts.createKeywordTypeNode(119);
+            return typeNode || ts.createKeywordTypeNode(119 /* AnyKeyword */);
         }
         function createAddPropertyDeclarationAction(context, classDeclarationSourceFile, classDeclaration, makeStatic, tokenName, typeNode) {
             var changes = ts.textChanges.ChangeTracker.with(context, function (t) { return addPropertyDeclaration(t, classDeclarationSourceFile, classDeclaration, tokenName, typeNode, makeStatic); });
             return codefix.createCodeFixAction(fixName, changes, [makeStatic ? ts.Diagnostics.Declare_static_property_0 : ts.Diagnostics.Declare_property_0, tokenName], fixId, ts.Diagnostics.Add_all_missing_members);
         }
         function addPropertyDeclaration(changeTracker, classDeclarationSourceFile, classDeclaration, tokenName, typeNode, makeStatic) {
-            var property = ts.createProperty(undefined, makeStatic ? [ts.createToken(115)] : undefined, tokenName, undefined, typeNode, undefined);
+            var property = ts.createProperty(
+            /*decorators*/ undefined, 
+            /*modifiers*/ makeStatic ? [ts.createToken(115 /* StaticKeyword */)] : undefined, tokenName, 
+            /*questionToken*/ undefined, typeNode, 
+            /*initializer*/ undefined);
             var lastProp = getNodeToInsertPropertyAfter(classDeclaration);
             if (lastProp) {
                 changeTracker.insertNodeAfter(classDeclarationSourceFile, lastProp, property);
@@ -85162,6 +103282,7 @@ var ts;
                 changeTracker.insertNodeAtClassStart(classDeclarationSourceFile, classDeclaration, property);
             }
         }
+        // Gets the last of the first run of PropertyDeclarations, or undefined if the class does not start with a PropertyDeclaration.
         function getNodeToInsertPropertyAfter(cls) {
             var res;
             for (var _i = 0, _a = cls.members; _i < _a.length; _i++) {
@@ -85173,10 +103294,19 @@ var ts;
             return res;
         }
         function createAddIndexSignatureAction(context, classDeclarationSourceFile, classDeclaration, tokenName, typeNode) {
-            var stringTypeNode = ts.createKeywordTypeNode(137);
-            var indexingParameter = ts.createParameter(undefined, undefined, undefined, "x", undefined, stringTypeNode, undefined);
-            var indexSignature = ts.createIndexSignature(undefined, undefined, [indexingParameter], typeNode);
+            // Index signatures cannot have the static modifier.
+            var stringTypeNode = ts.createKeywordTypeNode(137 /* StringKeyword */);
+            var indexingParameter = ts.createParameter(
+            /*decorators*/ undefined, 
+            /*modifiers*/ undefined, 
+            /*dotDotDotToken*/ undefined, "x", 
+            /*questionToken*/ undefined, stringTypeNode, 
+            /*initializer*/ undefined);
+            var indexSignature = ts.createIndexSignature(
+            /*decorators*/ undefined, 
+            /*modifiers*/ undefined, [indexingParameter], typeNode);
             var changes = ts.textChanges.ChangeTracker.with(context, function (t) { return t.insertNodeAtClassStart(classDeclarationSourceFile, classDeclaration, indexSignature); });
+            // No fixId here because code-fix-all currently only works on adding individual named properties.
             return codefix.createCodeFixActionNoFixId(fixName, changes, [ts.Diagnostics.Add_index_signature_for_property_0, tokenName]);
         }
         function getActionForMethodDeclaration(context, classDeclarationSourceFile, classDeclaration, token, callExpression, makeStatic, inJs, preferences) {
@@ -85185,7 +103315,7 @@ var ts;
         }
         function addMethodDeclaration(changeTracker, classDeclarationSourceFile, classDeclaration, token, callExpression, makeStatic, inJs, preferences) {
             var methodDeclaration = codefix.createMethodFromCallExpression(callExpression, token.text, inJs, makeStatic, preferences);
-            var containingMethodDeclaration = ts.getAncestor(callExpression, 154);
+            var containingMethodDeclaration = ts.getAncestor(callExpression, 154 /* MethodDeclaration */);
             if (containingMethodDeclaration && containingMethodDeclaration.parent === classDeclaration) {
                 changeTracker.insertNodeAfter(classDeclarationSourceFile, containingMethodDeclaration, methodDeclaration);
             }
@@ -85195,6 +103325,7 @@ var ts;
         }
     })(codefix = ts.codefix || (ts.codefix = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var codefix;
@@ -85211,7 +103342,7 @@ var ts;
                 var host = context.host, sourceFile = context.sourceFile, start = context.span.start;
                 var packageName = getTypesPackageNameToInstall(host, sourceFile, start, context.errorCode);
                 return packageName === undefined ? []
-                    : [codefix.createCodeFixAction(fixId, [], [ts.Diagnostics.Install_0, packageName], fixId, ts.Diagnostics.Install_all_missing_types_packages, getCommand(sourceFile.fileName, packageName))];
+                    : [codefix.createCodeFixAction(fixId, /*changes*/ [], [ts.Diagnostics.Install_0, packageName], fixId, ts.Diagnostics.Install_all_missing_types_packages, getCommand(sourceFile.fileName, packageName))];
             },
             fixIds: [fixId],
             getAllCodeActions: function (context) { return codefix.codeFixAll(context, errorCodes, function (_, diag, commands) {
@@ -85225,14 +103356,15 @@ var ts;
             return { type: "install package", file: fileName, packageName: packageName };
         }
         function getTypesPackageNameToInstall(host, sourceFile, pos, diagCode) {
-            var moduleName = ts.cast(ts.getTokenAtPosition(sourceFile, pos, false), ts.isStringLiteral).text;
+            var moduleName = ts.cast(ts.getTokenAtPosition(sourceFile, pos, /*includeJsDocComment*/ false), ts.isStringLiteral).text;
             var packageName = ts.getPackageName(moduleName).packageName;
             return diagCode === errorCodeCannotFindModule
                 ? (ts.JsTyping.nodeCoreModules.has(packageName) ? "@types/node" : undefined)
-                : (host.isKnownTypesPackageName(packageName) ? ts.getTypesPackageName(packageName) : undefined);
+                : (host.isKnownTypesPackageName(packageName) ? ts.getTypesPackageName(packageName) : undefined); // TODO: GH#18217
         }
     })(codefix = ts.codefix || (ts.codefix = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var codefix;
@@ -85263,21 +103395,28 @@ var ts;
             },
         });
         function getClass(sourceFile, pos) {
-            var token = ts.getTokenAtPosition(sourceFile, pos, false);
+            // Token is the identifier in the case of a class declaration
+            // or the class keyword token in the case of a class expression.
+            var token = ts.getTokenAtPosition(sourceFile, pos, /*includeJsDocComment*/ false);
             return ts.cast(token.parent, ts.isClassLike);
         }
         function addMissingMembers(classDeclaration, sourceFile, checker, changeTracker, preferences) {
             var extendsNode = ts.getClassExtendsHeritageClauseElement(classDeclaration);
             var instantiatedExtendsType = checker.getTypeAtLocation(extendsNode);
+            // Note that this is ultimately derived from a map indexed by symbol names,
+            // so duplicates cannot occur.
             var abstractAndNonPrivateExtendsSymbols = checker.getPropertiesOfType(instantiatedExtendsType).filter(symbolPointsToNonPrivateAndAbstractMember);
             codefix.createMissingMemberNodes(classDeclaration, abstractAndNonPrivateExtendsSymbols, checker, preferences, function (member) { return changeTracker.insertNodeAtClassStart(sourceFile, classDeclaration, member); });
         }
         function symbolPointsToNonPrivateAndAbstractMember(symbol) {
+            // See `codeFixClassExtendAbstractProtectedProperty.ts` in https://github.com/Microsoft/TypeScript/pull/11547/files
+            // (now named `codeFixClassExtendAbstractPrivateProperty.ts`)
             var flags = ts.getModifierFlags(ts.first(symbol.getDeclarations()));
-            return !(flags & 8) && !!(flags & 128);
+            return !(flags & 8 /* Private */) && !!(flags & 128 /* Abstract */);
         }
     })(codefix = ts.codefix || (ts.codefix = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var codefix;
@@ -85298,7 +103437,7 @@ var ts;
             fixIds: [fixId],
             getAllCodeActions: function (context) {
                 var sourceFile = context.sourceFile;
-                var seenClasses = ts.createMap();
+                var seenClasses = ts.createMap(); // Ensure we only do this once per class.
                 return codefix.codeFixAll(context, errorCodes, function (changes, diag) {
                     var nodes = getNodes(diag.file, diag.start);
                     if (!nodes)
@@ -85315,11 +103454,13 @@ var ts;
             changes.deleteNode(sourceFile, superCall);
         }
         function getNodes(sourceFile, pos) {
-            var token = ts.getTokenAtPosition(sourceFile, pos, false);
-            if (token.kind !== 99)
+            var token = ts.getTokenAtPosition(sourceFile, pos, /*includeJsDocComment*/ false);
+            if (token.kind !== 99 /* ThisKeyword */)
                 return undefined;
             var constructor = ts.getContainingFunction(token);
             var superCall = findSuperCall(constructor.body);
+            // figure out if the `this` access is actually inside the supercall
+            // i.e. super(this.a), since in that case we won't suggest a fix
             return superCall && !superCall.expression.arguments.some(function (arg) { return ts.isPropertyAccessExpression(arg) && arg.expression === token; }) ? { constructor: constructor, superCall: superCall } : undefined;
         }
         function findSuperCall(n) {
@@ -85331,6 +103472,7 @@ var ts;
         }
     })(codefix = ts.codefix || (ts.codefix = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var codefix;
@@ -85351,16 +103493,17 @@ var ts;
             }); },
         });
         function getNode(sourceFile, pos) {
-            var token = ts.getTokenAtPosition(sourceFile, pos, false);
-            ts.Debug.assert(token.kind === 123);
+            var token = ts.getTokenAtPosition(sourceFile, pos, /*includeJsDocComment*/ false);
+            ts.Debug.assert(token.kind === 123 /* ConstructorKeyword */);
             return token.parent;
         }
         function doChange(changes, sourceFile, ctr) {
-            var superCall = ts.createStatement(ts.createCall(ts.createSuper(), undefined, ts.emptyArray));
+            var superCall = ts.createStatement(ts.createCall(ts.createSuper(), /*typeArguments*/ undefined, /*argumentsArray*/ ts.emptyArray));
             changes.insertNodeAtConstructorStart(sourceFile, ctr, superCall);
         }
     })(codefix = ts.codefix || (ts.codefix = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var codefix;
@@ -85386,19 +103529,22 @@ var ts;
             }); },
         });
         function getNodes(sourceFile, pos) {
-            var token = ts.getTokenAtPosition(sourceFile, pos, false);
+            var token = ts.getTokenAtPosition(sourceFile, pos, /*includeJsDocComment*/ false);
             var heritageClauses = ts.getContainingClass(token).heritageClauses;
             var extendsToken = heritageClauses[0].getFirstToken();
-            return extendsToken.kind === 85 ? { extendsToken: extendsToken, heritageClauses: heritageClauses } : undefined;
+            return extendsToken.kind === 85 /* ExtendsKeyword */ ? { extendsToken: extendsToken, heritageClauses: heritageClauses } : undefined;
         }
         function doChanges(changes, sourceFile, extendsToken, heritageClauses) {
-            changes.replaceNode(sourceFile, extendsToken, ts.createToken(108));
+            changes.replaceNode(sourceFile, extendsToken, ts.createToken(108 /* ImplementsKeyword */));
+            // If there is already an implements clause, replace the implements keyword with a comma.
             if (heritageClauses.length === 2 &&
-                heritageClauses[0].token === 85 &&
-                heritageClauses[1].token === 108) {
+                heritageClauses[0].token === 85 /* ExtendsKeyword */ &&
+                heritageClauses[1].token === 108 /* ImplementsKeyword */) {
                 var implementsToken = heritageClauses[1].getFirstToken();
                 var implementsFullStart = implementsToken.getFullStart();
-                changes.replaceRange(sourceFile, { pos: implementsFullStart, end: implementsFullStart }, ts.createToken(26));
+                changes.replaceRange(sourceFile, { pos: implementsFullStart, end: implementsFullStart }, ts.createToken(26 /* CommaToken */));
+                // Rough heuristic: delete trailing whitespace after keyword so that it's not excessive.
+                // (Trailing because leading might be indentation, which is more sensitive.)
                 var text = sourceFile.text;
                 var end = implementsToken.end;
                 while (end < text.length && ts.isWhiteSpaceSingleLine(text.charCodeAt(end))) {
@@ -85409,6 +103555,7 @@ var ts;
         }
     })(codefix = ts.codefix || (ts.codefix = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var codefix;
@@ -85438,18 +103585,20 @@ var ts;
             }); },
         });
         function getInfo(sourceFile, pos, diagCode) {
-            var node = ts.getTokenAtPosition(sourceFile, pos, false);
+            var node = ts.getTokenAtPosition(sourceFile, pos, /*includeJsDocComment*/ false);
             if (!ts.isIdentifier(node))
                 return undefined;
             return { node: node, className: diagCode === didYouMeanStaticMemberCode ? ts.getContainingClass(node).name.text : undefined };
         }
         function doChange(changes, sourceFile, _a) {
             var node = _a.node, className = _a.className;
+            // TODO (https://github.com/Microsoft/TypeScript/issues/21246): use shared helper
             ts.suppressLeadingAndTrailingTrivia(node);
             changes.replaceNode(sourceFile, node, ts.createPropertyAccess(className ? ts.createIdentifier(className) : ts.createThis(), node));
         }
     })(codefix = ts.codefix || (ts.codefix = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var codefix;
@@ -85470,23 +103619,23 @@ var ts;
             getCodeActions: function (context) {
                 var errorCode = context.errorCode, sourceFile = context.sourceFile, program = context.program;
                 var checker = program.getTypeChecker();
-                var startToken = ts.getTokenAtPosition(sourceFile, context.span.start, false);
+                var startToken = ts.getTokenAtPosition(sourceFile, context.span.start, /*includeJsDocComment*/ false);
                 var importDecl = tryGetFullImport(startToken);
                 if (importDecl) {
                     var changes = ts.textChanges.ChangeTracker.with(context, function (t) { return t.deleteNode(sourceFile, importDecl); });
                     return [codefix.createCodeFixAction(fixName, changes, [ts.Diagnostics.Remove_import_from_0, ts.showModuleSpecifier(importDecl)], fixIdDelete, ts.Diagnostics.Delete_all_unused_declarations)];
                 }
-                var delDestructure = ts.textChanges.ChangeTracker.with(context, function (t) { return tryDeleteFullDestructure(t, sourceFile, startToken, undefined, checker, false); });
+                var delDestructure = ts.textChanges.ChangeTracker.with(context, function (t) { return tryDeleteFullDestructure(t, sourceFile, startToken, /*deleted*/ undefined, checker, /*isFixAll*/ false); });
                 if (delDestructure.length) {
                     return [codefix.createCodeFixAction(fixName, delDestructure, ts.Diagnostics.Remove_destructuring, fixIdDelete, ts.Diagnostics.Delete_all_unused_declarations)];
                 }
-                var delVar = ts.textChanges.ChangeTracker.with(context, function (t) { return tryDeleteFullVariableStatement(t, sourceFile, startToken, undefined); });
+                var delVar = ts.textChanges.ChangeTracker.with(context, function (t) { return tryDeleteFullVariableStatement(t, sourceFile, startToken, /*deleted*/ undefined); });
                 if (delVar.length) {
                     return [codefix.createCodeFixAction(fixName, delVar, ts.Diagnostics.Remove_variable_statement, fixIdDelete, ts.Diagnostics.Delete_all_unused_declarations)];
                 }
                 var token = getToken(sourceFile, ts.textSpanEnd(context.span));
                 var result = [];
-                var deletion = ts.textChanges.ChangeTracker.with(context, function (t) { return tryDeleteDeclaration(t, sourceFile, token, undefined, checker, false); });
+                var deletion = ts.textChanges.ChangeTracker.with(context, function (t) { return tryDeleteDeclaration(t, sourceFile, token, /*deleted*/ undefined, checker, /*isFixAll*/ false); });
                 if (deletion.length) {
                     result.push(codefix.createCodeFixAction(fixName, deletion, [ts.Diagnostics.Remove_declaration_for_Colon_0, token.getText(sourceFile)], fixIdDelete, ts.Diagnostics.Delete_all_unused_declarations));
                 }
@@ -85498,11 +103647,12 @@ var ts;
             },
             fixIds: [fixIdPrefix, fixIdDelete],
             getAllCodeActions: function (context) {
+                // Track a set of deleted nodes that may be ancestors of other marked for deletion -- only delete the ancestors.
                 var deleted = new ts.NodeSet();
                 var sourceFile = context.sourceFile, program = context.program;
                 var checker = program.getTypeChecker();
                 return codefix.codeFixAll(context, errorCodes, function (changes, diag) {
-                    var startToken = ts.getTokenAtPosition(sourceFile, diag.start, false);
+                    var startToken = ts.getTokenAtPosition(sourceFile, diag.start, /*includeJsDocComment*/ false);
                     var token = ts.findPrecedingToken(ts.textSpanEnd(diag), diag.file);
                     switch (context.fixId) {
                         case fixIdPrefix:
@@ -85511,15 +103661,16 @@ var ts;
                             }
                             break;
                         case fixIdDelete:
+                            // Ignore if this range was already deleted.
                             if (deleted.some(function (d) { return ts.rangeContainsPosition(d, diag.start); }))
                                 break;
                             var importDecl = tryGetFullImport(startToken);
                             if (importDecl) {
                                 changes.deleteNode(sourceFile, importDecl);
                             }
-                            else if (!tryDeleteFullDestructure(changes, sourceFile, startToken, deleted, checker, true) &&
+                            else if (!tryDeleteFullDestructure(changes, sourceFile, startToken, deleted, checker, /*isFixAll*/ true) &&
                                 !tryDeleteFullVariableStatement(changes, sourceFile, startToken, deleted)) {
-                                tryDeleteDeclaration(changes, sourceFile, token, deleted, checker, true);
+                                tryDeleteDeclaration(changes, sourceFile, token, deleted, checker, /*isFixAll*/ true);
                             }
                             break;
                         default:
@@ -85528,25 +103679,26 @@ var ts;
                 });
             },
         });
+        // Sometimes the diagnostic span is an entire ImportDeclaration, so we should remove the whole thing.
         function tryGetFullImport(startToken) {
-            return startToken.kind === 91 ? ts.tryCast(startToken.parent, ts.isImportDeclaration) : undefined;
+            return startToken.kind === 91 /* ImportKeyword */ ? ts.tryCast(startToken.parent, ts.isImportDeclaration) : undefined;
         }
         function tryDeleteFullDestructure(changes, sourceFile, startToken, deletedAncestors, checker, isFixAll) {
-            if (startToken.kind !== 17 || !ts.isObjectBindingPattern(startToken.parent))
+            if (startToken.kind !== 17 /* OpenBraceToken */ || !ts.isObjectBindingPattern(startToken.parent))
                 return false;
             var decl = ts.cast(startToken.parent, ts.isObjectBindingPattern).parent;
             switch (decl.kind) {
-                case 232:
+                case 232 /* VariableDeclaration */:
                     tryDeleteVariableDeclaration(changes, sourceFile, decl, deletedAncestors);
                     break;
-                case 149:
+                case 149 /* Parameter */:
                     if (!mayDeleteParameter(decl, checker, isFixAll))
                         break;
                     if (deletedAncestors)
                         deletedAncestors.add(decl);
                     changes.deleteNodeInList(sourceFile, decl);
                     break;
-                case 182:
+                case 182 /* BindingElement */:
                     if (deletedAncestors)
                         deletedAncestors.add(decl);
                     changes.deleteNode(sourceFile, decl);
@@ -85561,29 +103713,31 @@ var ts;
             if (declarationList && declarationList.getChildren(sourceFile)[0] === startToken) {
                 if (deletedAncestors)
                     deletedAncestors.add(declarationList);
-                changes.deleteNode(sourceFile, declarationList.parent.kind === 214 ? declarationList.parent : declarationList);
+                changes.deleteNode(sourceFile, declarationList.parent.kind === 214 /* VariableStatement */ ? declarationList.parent : declarationList);
                 return true;
             }
             return false;
         }
         function getToken(sourceFile, pos) {
-            var token = ts.findPrecedingToken(pos, sourceFile, undefined, true);
-            return token.kind === 22 ? ts.findPrecedingToken(pos - 1, sourceFile) : token;
+            var token = ts.findPrecedingToken(pos, sourceFile, /*startNode*/ undefined, /*includeJsDoc*/ true);
+            // this handles var ["computed"] = 12;
+            return token.kind === 22 /* CloseBracketToken */ ? ts.findPrecedingToken(pos - 1, sourceFile) : token;
         }
         function tryPrefixDeclaration(changes, errorCode, sourceFile, token) {
+            // Don't offer to prefix a property.
             if (errorCode !== ts.Diagnostics.Property_0_is_declared_but_its_value_is_never_read.code && ts.isIdentifier(token) && canPrefix(token)) {
                 changes.replaceNode(sourceFile, token, ts.createIdentifier("_" + token.text));
             }
         }
         function canPrefix(token) {
             switch (token.parent.kind) {
-                case 149:
+                case 149 /* Parameter */:
                     return true;
-                case 232: {
+                case 232 /* VariableDeclaration */: {
                     var varDecl = token.parent;
                     switch (varDecl.parent.parent.kind) {
-                        case 222:
-                        case 221:
+                        case 222 /* ForOfStatement */:
+                        case 221 /* ForInStatement */:
                             return true;
                     }
                 }
@@ -85592,11 +103746,12 @@ var ts;
         }
         function tryDeleteDeclaration(changes, sourceFile, token, deletedAncestors, checker, isFixAll) {
             switch (token.kind) {
-                case 71:
+                case 71 /* Identifier */:
                     tryDeleteIdentifier(changes, sourceFile, token, deletedAncestors, checker, isFixAll);
+                    deleteAssignments(changes, sourceFile, token, checker);
                     break;
-                case 152:
-                case 246:
+                case 152 /* PropertyDeclaration */:
+                case 246 /* NamespaceImport */:
                     if (deletedAncestors)
                         deletedAncestors.add(token.parent);
                     changes.deleteNode(sourceFile, token.parent);
@@ -85605,6 +103760,15 @@ var ts;
                     tryDeleteDefault(changes, sourceFile, token, deletedAncestors);
             }
         }
+        function deleteAssignments(changes, sourceFile, token, checker) {
+            ts.FindAllReferences.Core.eachSymbolReferenceInFile(token, checker, sourceFile, function (ref) {
+                if (ref.parent.kind === 185 /* PropertyAccessExpression */)
+                    ref = ref.parent;
+                if (ref.parent.kind === 200 /* BinaryExpression */ && ref.parent.parent.kind === 216 /* ExpressionStatement */) {
+                    changes.deleteNode(sourceFile, ref.parent.parent);
+                }
+            });
+        }
         function tryDeleteDefault(changes, sourceFile, token, deletedAncestors) {
             if (ts.isDeclarationName(token)) {
                 if (deletedAncestors)
@@ -85620,29 +103784,37 @@ var ts;
         function tryDeleteIdentifier(changes, sourceFile, identifier, deletedAncestors, checker, isFixAll) {
             var parent = identifier.parent;
             switch (parent.kind) {
-                case 232:
+                case 232 /* VariableDeclaration */:
                     tryDeleteVariableDeclaration(changes, sourceFile, parent, deletedAncestors);
                     break;
-                case 148:
+                case 148 /* TypeParameter */:
                     var typeParameters = ts.getEffectiveTypeParameterDeclarations(parent.parent);
                     if (typeParameters.length === 1) {
                         var _a = ts.cast(typeParameters, ts.isNodeArray), pos = _a.pos, end = _a.end;
-                        var previousToken = ts.getTokenAtPosition(sourceFile, pos - 1, false);
-                        var nextToken = ts.getTokenAtPosition(sourceFile, end, false);
-                        ts.Debug.assert(previousToken.kind === 27);
-                        ts.Debug.assert(nextToken.kind === 29);
+                        var previousToken = ts.getTokenAtPosition(sourceFile, pos - 1, /*includeJsDocComment*/ false);
+                        var nextToken = ts.getTokenAtPosition(sourceFile, end, /*includeJsDocComment*/ false);
+                        ts.Debug.assert(previousToken.kind === 27 /* LessThanToken */);
+                        ts.Debug.assert(nextToken.kind === 29 /* GreaterThanToken */);
                         changes.deleteNodeRange(sourceFile, previousToken, nextToken);
                     }
                     else {
                         changes.deleteNodeInList(sourceFile, parent);
                     }
                     break;
-                case 149:
+                case 149 /* Parameter */:
                     if (!mayDeleteParameter(parent, checker, isFixAll))
                         break;
                     var oldFunction = parent.parent;
                     if (ts.isArrowFunction(oldFunction) && oldFunction.parameters.length === 1) {
-                        var newFunction = ts.updateArrowFunction(oldFunction, oldFunction.modifiers, oldFunction.typeParameters, undefined, oldFunction.type, oldFunction.equalsGreaterThanToken, oldFunction.body);
+                        // Lambdas with exactly one parameter are special because, after removal, there
+                        // must be an empty parameter list (i.e. `()`) and this won't necessarily be the
+                        // case if the parameter is simply removed (e.g. in `x => 1`).
+                        var newFunction = ts.updateArrowFunction(oldFunction, oldFunction.modifiers, oldFunction.typeParameters, 
+                        /*parameters*/ undefined, // TODO: GH#18217
+                        oldFunction.type, oldFunction.equalsGreaterThanToken, oldFunction.body);
+                        // Drop leading and trailing trivia of the new function because we're only going
+                        // to replace the span (vs the full span) of the old function - the old leading
+                        // and trailing trivia will remain.
                         ts.suppressLeadingAndTrailingTrivia(newFunction);
                         changes.replaceNode(sourceFile, oldFunction, newFunction);
                     }
@@ -85650,43 +103822,44 @@ var ts;
                         changes.deleteNodeInList(sourceFile, parent);
                     }
                     break;
-                case 182: {
+                case 182 /* BindingElement */: {
                     var pattern = parent.parent;
-                    switch (pattern.kind) {
-                        case 181:
-                            changes.deleteNode(sourceFile, parent);
-                            break;
-                        case 180:
-                            changes.deleteNodeInList(sourceFile, parent);
-                            break;
-                        default:
-                            return ts.Debug.assertNever(pattern);
-                    }
-                    break;
-                }
-                case 243:
-                    var importEquals = ts.getAncestor(identifier, 243);
-                    changes.deleteNode(sourceFile, importEquals);
-                    break;
-                case 248:
-                    var namedImports = parent.parent;
-                    if (namedImports.elements.length === 1) {
-                        tryDeleteNamedImportBinding(changes, sourceFile, namedImports);
+                    var preserveComma = pattern.kind === 181 /* ArrayBindingPattern */ && parent !== ts.last(pattern.elements);
+                    if (preserveComma) {
+                        changes.deleteNode(sourceFile, parent);
                     }
                     else {
                         changes.deleteNodeInList(sourceFile, parent);
                     }
                     break;
-                case 245:
-                    var importClause = parent;
-                    if (!importClause.namedBindings) {
-                        changes.deleteNode(sourceFile, ts.getAncestor(importClause, 244));
+                }
+                // handle case where 'import a = A;'
+                case 243 /* ImportEqualsDeclaration */:
+                    var importEquals = ts.getAncestor(identifier, 243 /* ImportEqualsDeclaration */);
+                    changes.deleteNode(sourceFile, importEquals);
+                    break;
+                case 248 /* ImportSpecifier */:
+                    var namedImports = parent.parent;
+                    if (namedImports.elements.length === 1) {
+                        tryDeleteNamedImportBinding(changes, sourceFile, namedImports);
                     }
                     else {
+                        // delete import specifier
+                        changes.deleteNodeInList(sourceFile, parent);
+                    }
+                    break;
+                case 245 /* ImportClause */: // this covers both 'import |d|' and 'import |d,| *'
+                    var importClause = parent;
+                    if (!importClause.namedBindings) { // |import d from './file'|
+                        changes.deleteNode(sourceFile, ts.getAncestor(importClause, 244 /* ImportDeclaration */));
+                    }
+                    else {
+                        // import |d,| * as ns from './file'
                         var start = importClause.name.getStart(sourceFile);
-                        var nextToken = ts.getTokenAtPosition(sourceFile, importClause.name.end, false);
-                        if (nextToken && nextToken.kind === 26) {
-                            var end = ts.skipTrivia(sourceFile.text, nextToken.end, false, true);
+                        var nextToken = ts.getTokenAtPosition(sourceFile, importClause.name.end, /*includeJsDocComment*/ false);
+                        if (nextToken && nextToken.kind === 26 /* CommaToken */) {
+                            // shift first non-whitespace position after comma to the start position of the node
+                            var end = ts.skipTrivia(sourceFile.text, nextToken.end, /*stopAfterLineBreaks*/ false, /*stopAtComments*/ true);
                             changes.deleteRange(sourceFile, { pos: start, end: end });
                         }
                         else {
@@ -85694,7 +103867,7 @@ var ts;
                         }
                     }
                     break;
-                case 246:
+                case 246 /* NamespaceImport */:
                     tryDeleteNamedImportBinding(changes, sourceFile, parent);
                     break;
                 default:
@@ -85704,19 +103877,26 @@ var ts;
         }
         function tryDeleteNamedImportBinding(changes, sourceFile, namedBindings) {
             if (namedBindings.parent.name) {
-                var previousToken = ts.getTokenAtPosition(sourceFile, namedBindings.pos - 1, false);
-                if (previousToken && previousToken.kind === 26) {
+                // Delete named imports while preserving the default import
+                // import d|, * as ns| from './file'
+                // import d|, { a }| from './file'
+                var previousToken = ts.getTokenAtPosition(sourceFile, namedBindings.pos - 1, /*includeJsDocComment*/ false);
+                if (previousToken && previousToken.kind === 26 /* CommaToken */) {
                     changes.deleteRange(sourceFile, { pos: previousToken.getStart(), end: namedBindings.end });
                 }
             }
             else {
-                var importDecl = ts.getAncestor(namedBindings, 244);
+                // Delete the entire import declaration
+                // |import * as ns from './file'|
+                // |import { a } from './file'|
+                var importDecl = ts.getAncestor(namedBindings, 244 /* ImportDeclaration */);
                 changes.deleteNode(sourceFile, importDecl);
             }
         }
+        // token.parent is a variableDeclaration
         function tryDeleteVariableDeclaration(changes, sourceFile, varDecl, deletedAncestors) {
             switch (varDecl.parent.parent.kind) {
-                case 220: {
+                case 220 /* ForStatement */: {
                     var forStatement = varDecl.parent.parent;
                     var forInitializer = forStatement.initializer;
                     if (forInitializer.declarations.length === 1) {
@@ -85731,16 +103911,16 @@ var ts;
                     }
                     break;
                 }
-                case 222:
+                case 222 /* ForOfStatement */:
                     var forOfStatement = varDecl.parent.parent;
-                    ts.Debug.assert(forOfStatement.initializer.kind === 233);
+                    ts.Debug.assert(forOfStatement.initializer.kind === 233 /* VariableDeclarationList */);
                     var forOfInitializer = forOfStatement.initializer;
                     if (deletedAncestors)
                         deletedAncestors.add(forOfInitializer.declarations[0]);
                     changes.replaceNode(sourceFile, forOfInitializer.declarations[0], ts.createObjectLiteral());
                     break;
-                case 221:
-                case 230:
+                case 221 /* ForInStatement */:
+                case 230 /* TryStatement */:
                     break;
                 default:
                     var variableStatement = varDecl.parent.parent;
@@ -85759,22 +103939,26 @@ var ts;
         function mayDeleteParameter(p, checker, isFixAll) {
             var parent = p.parent;
             switch (parent.kind) {
-                case 154:
+                case 154 /* MethodDeclaration */:
+                    // Don't remove a parameter if this overrides something
                     var symbol = checker.getSymbolAtLocation(parent.name);
                     if (ts.isMemberSymbolInBaseType(symbol, checker))
                         return false;
-                case 155:
-                case 234:
-                case 192:
-                case 193: {
+                // falls through
+                case 155 /* Constructor */:
+                case 234 /* FunctionDeclaration */:
+                case 192 /* FunctionExpression */:
+                case 193 /* ArrowFunction */: {
+                    // Can't remove a non-last parameter. Can remove a parameter in code-fix-all if future parameters are also unused.
                     var parameters = parent.parameters;
                     var index = parameters.indexOf(p);
                     ts.Debug.assert(index !== -1);
                     return isFixAll
-                        ? parameters.slice(index + 1).every(function (p) { return p.name.kind === 71 && !p.symbol.isReferenced; })
+                        ? parameters.slice(index + 1).every(function (p) { return p.name.kind === 71 /* Identifier */ && !p.symbol.isReferenced; })
                         : index === parameters.length - 1;
                 }
-                case 157:
+                case 157 /* SetAccessor */:
+                    // Setter must have a parameter
                     return false;
                 default:
                     return ts.Debug.failBadSyntaxKind(parent);
@@ -85782,6 +103966,7 @@ var ts;
         }
     })(codefix = ts.codefix || (ts.codefix = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var codefix;
@@ -85798,12 +103983,12 @@ var ts;
             getAllCodeActions: function (context) { return codefix.codeFixAll(context, errorCodes, function (changes, diag) { return doChange(changes, diag.file, diag.start); }); },
         });
         function doChange(changes, sourceFile, start) {
-            var token = ts.getTokenAtPosition(sourceFile, start, false);
+            var token = ts.getTokenAtPosition(sourceFile, start, /*includeJsDocComment*/ false);
             var statement = ts.findAncestor(token, ts.isStatement);
             ts.Debug.assert(statement.getStart(sourceFile) === token.getStart(sourceFile));
             var container = (ts.isBlock(statement.parent) ? statement.parent : statement).parent;
             switch (container.kind) {
-                case 217:
+                case 217 /* IfStatement */:
                     if (container.elseStatement) {
                         if (ts.isBlock(statement.parent)) {
                             changes.deleteNodeRange(sourceFile, ts.first(statement.parent.statements), ts.last(statement.parent.statements));
@@ -85813,8 +103998,9 @@ var ts;
                         }
                         break;
                     }
-                case 219:
-                case 220:
+                // falls through
+                case 219 /* WhileStatement */:
+                case 220 /* ForStatement */:
                     changes.deleteNode(sourceFile, container);
                     break;
                 default:
@@ -85827,18 +104013,20 @@ var ts;
             }
         }
         function shouldRemove(s) {
+            // Don't remove statements that can validly be used before they appear.
             return !ts.isFunctionDeclaration(s) && !isPurelyTypeDeclaration(s) &&
-                !(ts.isVariableStatement(s) && !(ts.getCombinedNodeFlags(s) & (1 | 2)) && s.declarationList.declarations.some(function (d) { return !d.initializer; }));
+                // `var x;` may declare a variable used above
+                !(ts.isVariableStatement(s) && !(ts.getCombinedNodeFlags(s) & (1 /* Let */ | 2 /* Const */)) && s.declarationList.declarations.some(function (d) { return !d.initializer; }));
         }
         function isPurelyTypeDeclaration(s) {
             switch (s.kind) {
-                case 236:
-                case 237:
+                case 236 /* InterfaceDeclaration */:
+                case 237 /* TypeAliasDeclaration */:
                     return true;
-                case 239:
-                    return ts.getModuleInstanceState(s) !== 1;
-                case 238:
-                    return ts.hasModifier(s, 2048);
+                case 239 /* ModuleDeclaration */:
+                    return ts.getModuleInstanceState(s) !== 1 /* Instantiated */;
+                case 238 /* EnumDeclaration */:
+                    return ts.hasModifier(s, 2048 /* Const */);
                 default:
                     return false;
             }
@@ -85848,11 +104036,13 @@ var ts;
             ts.Debug.assert(index !== -1);
             return arr.slice(index);
         }
+        // Calls 'cb' with the start and end of each range where 'pred' is true.
         function split(arr, pred, cb) {
             ts.getRangesWhere(arr, pred, function (start, afterEnd) { return cb(arr[start], arr[afterEnd - 1]); });
         }
     })(codefix = ts.codefix || (ts.codefix = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var codefix;
@@ -85869,16 +104059,18 @@ var ts;
             getAllCodeActions: function (context) { return codefix.codeFixAll(context, errorCodes, function (changes, diag) { return doChange(changes, diag.file, diag.start); }); },
         });
         function doChange(changes, sourceFile, start) {
-            var token = ts.getTokenAtPosition(sourceFile, start, false);
+            var token = ts.getTokenAtPosition(sourceFile, start, /*includeJsDocComment*/ false);
             var labeledStatement = ts.cast(token.parent, ts.isLabeledStatement);
             var pos = token.getStart(sourceFile);
             var statementPos = labeledStatement.statement.getStart(sourceFile);
+            // If label is on a separate line, just delete the rest of that line, but not the indentation of the labeled statement.
             var end = ts.positionsAreOnSameLine(pos, statementPos, sourceFile) ? statementPos
-                : ts.skipTrivia(sourceFile.text, ts.findChildOfKind(labeledStatement, 56, sourceFile).end, true);
+                : ts.skipTrivia(sourceFile.text, ts.findChildOfKind(labeledStatement, 56 /* ColonToken */, sourceFile).end, /*stopAfterLineBreak*/ true);
             changes.deleteRange(sourceFile, { pos: pos, end: end });
         }
     })(codefix = ts.codefix || (ts.codefix = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var codefix;
@@ -85897,8 +104089,10 @@ var ts;
                 var typeNode = info.typeNode, type = info.type;
                 var original = typeNode.getText(sourceFile);
                 var actions = [fix(type, fixIdPlain, ts.Diagnostics.Change_all_jsdoc_style_types_to_TypeScript)];
-                if (typeNode.kind === 281) {
-                    actions.push(fix(checker.getNullableType(type, 8192), fixIdNullable, ts.Diagnostics.Change_all_jsdoc_style_types_to_TypeScript_and_add_undefined_to_nullable_types));
+                if (typeNode.kind === 281 /* JSDocNullableType */) {
+                    // for nullable types, suggest the flow-compatible `T | null | undefined`
+                    // in addition to the jsdoc/closure-compatible `T | null`
+                    actions.push(fix(checker.getNullableType(type, 8192 /* Undefined */), fixIdNullable, ts.Diagnostics.Change_all_jsdoc_style_types_to_TypeScript_and_add_undefined_to_nullable_types));
                 }
                 return actions;
                 function fix(type, fixId, fixAllDescription) {
@@ -85915,37 +104109,39 @@ var ts;
                     if (!info)
                         return;
                     var typeNode = info.typeNode, type = info.type;
-                    var fixedType = typeNode.kind === 281 && fixId === fixIdNullable ? checker.getNullableType(type, 8192) : type;
+                    var fixedType = typeNode.kind === 281 /* JSDocNullableType */ && fixId === fixIdNullable ? checker.getNullableType(type, 8192 /* Undefined */) : type;
                     doChange(changes, sourceFile, typeNode, fixedType, checker);
                 });
             }
         });
         function doChange(changes, sourceFile, oldTypeNode, newType, checker) {
-            changes.replaceNode(sourceFile, oldTypeNode, checker.typeToTypeNode(newType, oldTypeNode));
+            changes.replaceNode(sourceFile, oldTypeNode, checker.typeToTypeNode(newType, /*enclosingDeclaration*/ oldTypeNode)); // TODO: GH#18217
         }
         function getInfo(sourceFile, pos, checker) {
-            var decl = ts.findAncestor(ts.getTokenAtPosition(sourceFile, pos, false), isTypeContainer);
+            var decl = ts.findAncestor(ts.getTokenAtPosition(sourceFile, pos, /*includeJsDocComment*/ false), isTypeContainer);
             var typeNode = decl && decl.type;
             return typeNode && { typeNode: typeNode, type: checker.getTypeFromTypeNode(typeNode) };
         }
         function isTypeContainer(node) {
+            // NOTE: Some locations are not handled yet:
+            // MappedTypeNode.typeParameters and SignatureDeclaration.typeParameters, as well as CallExpression.typeArguments
             switch (node.kind) {
-                case 208:
-                case 158:
-                case 159:
-                case 234:
-                case 156:
-                case 160:
-                case 177:
-                case 154:
-                case 153:
-                case 149:
-                case 152:
-                case 151:
-                case 157:
-                case 237:
-                case 190:
-                case 232:
+                case 208 /* AsExpression */:
+                case 158 /* CallSignature */:
+                case 159 /* ConstructSignature */:
+                case 234 /* FunctionDeclaration */:
+                case 156 /* GetAccessor */:
+                case 160 /* IndexSignature */:
+                case 177 /* MappedType */:
+                case 154 /* MethodDeclaration */:
+                case 153 /* MethodSignature */:
+                case 149 /* Parameter */:
+                case 152 /* PropertyDeclaration */:
+                case 151 /* PropertySignature */:
+                case 157 /* SetAccessor */:
+                case 237 /* TypeAliasDeclaration */:
+                case 190 /* TypeAssertionExpression */:
+                case 232 /* VariableDeclaration */:
                     return true;
                 default:
                     return false;
@@ -85953,6 +104149,7 @@ var ts;
         }
     })(codefix = ts.codefix || (ts.codefix = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var codefix;
@@ -85991,22 +104188,22 @@ var ts;
             }
         }
         function getNodes(sourceFile, start) {
-            var token = ts.getTokenAtPosition(sourceFile, start, false);
+            var token = ts.getTokenAtPosition(sourceFile, start, /*includeJsDocComment*/ false);
             var containingFunction = ts.getContainingFunction(token);
             if (!containingFunction) {
                 return;
             }
             var insertBefore;
             switch (containingFunction.kind) {
-                case 154:
+                case 154 /* MethodDeclaration */:
                     insertBefore = containingFunction.name;
                     break;
-                case 234:
-                case 192:
-                    insertBefore = ts.findChildOfKind(containingFunction, 89, sourceFile);
+                case 234 /* FunctionDeclaration */:
+                case 192 /* FunctionExpression */:
+                    insertBefore = ts.findChildOfKind(containingFunction, 89 /* FunctionKeyword */, sourceFile);
                     break;
-                case 193:
-                    insertBefore = ts.findChildOfKind(containingFunction, 19, sourceFile) || ts.first(containingFunction.parameters);
+                case 193 /* ArrowFunction */:
+                    insertBefore = ts.findChildOfKind(containingFunction, 19 /* OpenParenToken */, sourceFile) || ts.first(containingFunction.parameters);
                     break;
                 default:
                     return;
@@ -86020,14 +104217,15 @@ var ts;
             var insertBefore = _a.insertBefore, returnType = _a.returnType;
             if (returnType) {
                 var entityName = ts.getEntityNameFromTypeNode(returnType);
-                if (!entityName || entityName.kind !== 71 || entityName.text !== "Promise") {
+                if (!entityName || entityName.kind !== 71 /* Identifier */ || entityName.text !== "Promise") {
                     changes.replaceNode(sourceFile, returnType, ts.createTypeReferenceNode("Promise", ts.createNodeArray([returnType])));
                 }
             }
-            changes.insertModifierBefore(sourceFile, 120, insertBefore);
+            changes.insertModifierBefore(sourceFile, 120 /* AsyncKeyword */, insertBefore);
         }
     })(codefix = ts.codefix || (ts.codefix = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var codefix;
@@ -86046,6 +104244,7 @@ var ts;
                     return undefined;
                 }
                 var fixes = [
+                    // fixId unnecessary because adding `// @ts-nocheck` even once will ignore every error in the file.
                     codefix.createCodeFixActionNoFixId(fixName, [codefix.createFileTextChanges(sourceFile.fileName, [
                             ts.createTextChange(sourceFile.checkJsDirective
                                 ? ts.createTextSpanFromBounds(sourceFile.checkJsDirective.pos, sourceFile.checkJsDirective.end)
@@ -86069,16 +104268,24 @@ var ts;
         });
         function makeChange(changes, sourceFile, position, seenLines) {
             var lineNumber = ts.getLineAndCharacterOfPosition(sourceFile, position).line;
+            // Only need to add `// @ts-ignore` for a line once.
             if (!seenLines || ts.addToSeen(seenLines, lineNumber)) {
                 changes.insertCommentBeforeLine(sourceFile, lineNumber, position, " @ts-ignore");
             }
         }
     })(codefix = ts.codefix || (ts.codefix = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var codefix;
     (function (codefix) {
+        /**
+         * Finds members of the resolved type that are missing in the class pointed to by class decl
+         * and generates source code for the missing members.
+         * @param possiblyMissingSymbols The collection of symbols to filter and then get insertions for.
+         * @returns Empty string iff there are no member insertions.
+         */
         function createMissingMemberNodes(classDeclaration, possiblyMissingSymbols, checker, preferences, out) {
             var classMembers = classDeclaration.symbol.members;
             for (var _i = 0, possiblyMissingSymbols_1 = possiblyMissingSymbols; _i < possiblyMissingSymbols_1.length; _i++) {
@@ -86089,28 +104296,40 @@ var ts;
             }
         }
         codefix.createMissingMemberNodes = createMissingMemberNodes;
+        /**
+         * @returns Empty string iff there we can't figure out a representation for `symbol` in `enclosingDeclaration`.
+         */
         function addNewNodeForMemberSymbol(symbol, enclosingDeclaration, checker, preferences, out) {
             var declarations = symbol.getDeclarations();
             if (!(declarations && declarations.length)) {
                 return undefined;
             }
             var declaration = declarations[0];
-            var name = ts.getSynthesizedDeepClone(ts.getNameOfDeclaration(declaration), false);
+            var name = ts.getSynthesizedDeepClone(ts.getNameOfDeclaration(declaration), /*includeTrivia*/ false);
             var visibilityModifier = createVisibilityModifier(ts.getModifierFlags(declaration));
             var modifiers = visibilityModifier ? ts.createNodeArray([visibilityModifier]) : undefined;
             var type = checker.getWidenedType(checker.getTypeOfSymbolAtLocation(symbol, enclosingDeclaration));
-            var optional = !!(symbol.flags & 16777216);
+            var optional = !!(symbol.flags & 16777216 /* Optional */);
             switch (declaration.kind) {
-                case 156:
-                case 157:
-                case 151:
-                case 152:
+                case 156 /* GetAccessor */:
+                case 157 /* SetAccessor */:
+                case 151 /* PropertySignature */:
+                case 152 /* PropertyDeclaration */:
                     var typeNode = checker.typeToTypeNode(type, enclosingDeclaration);
-                    out(ts.createProperty(undefined, modifiers, name, optional ? ts.createToken(55) : undefined, typeNode, undefined));
+                    out(ts.createProperty(
+                    /*decorators*/ undefined, modifiers, name, optional ? ts.createToken(55 /* QuestionToken */) : undefined, typeNode, 
+                    /*initializer*/ undefined));
                     break;
-                case 153:
-                case 154:
-                    var signatures = checker.getSignaturesOfType(type, 0);
+                case 153 /* MethodSignature */:
+                case 154 /* MethodDeclaration */:
+                    // The signature for the implementation appears as an entry in `signatures` iff
+                    // there is only one signature.
+                    // If there are overloads and an implementation signature, it appears as an
+                    // extra declaration that isn't a signature for `type`.
+                    // If there is more than one overload but no implementation signature
+                    // (eg: an abstract method or interface declaration), there is a 1-1
+                    // correspondence of declarations and signatures.
+                    var signatures = checker.getSignaturesOfType(type, 0 /* Call */);
                     if (!ts.some(signatures)) {
                         break;
                     }
@@ -86120,9 +104339,10 @@ var ts;
                         outputMethod(signature, modifiers, name, createStubbedMethodBody(preferences));
                         break;
                     }
-                    for (var _i = 0, signatures_8 = signatures; _i < signatures_8.length; _i++) {
-                        var signature = signatures_8[_i];
-                        outputMethod(signature, ts.getSynthesizedDeepClones(modifiers, false), ts.getSynthesizedDeepClone(name, false));
+                    for (var _i = 0, signatures_1 = signatures; _i < signatures_1.length; _i++) {
+                        var signature = signatures_1[_i];
+                        // Need to ensure nodes are fresh each time so they can have different positions.
+                        outputMethod(signature, ts.getSynthesizedDeepClones(modifiers, /*includeTrivia*/ false), ts.getSynthesizedDeepClone(name, /*includeTrivia*/ false));
                     }
                     if (declarations.length > signatures.length) {
                         var signature = checker.getSignatureFromDeclaration(declarations[declarations.length - 1]);
@@ -86141,38 +104361,56 @@ var ts;
             }
         }
         function signatureToMethodDeclaration(checker, signature, enclosingDeclaration, modifiers, name, optional, body) {
-            var signatureDeclaration = checker.signatureToSignatureDeclaration(signature, 154, enclosingDeclaration, 256);
+            var signatureDeclaration = checker.signatureToSignatureDeclaration(signature, 154 /* MethodDeclaration */, enclosingDeclaration, 256 /* SuppressAnyReturnType */);
             if (!signatureDeclaration) {
                 return undefined;
             }
             signatureDeclaration.decorators = undefined;
             signatureDeclaration.modifiers = modifiers;
             signatureDeclaration.name = name;
-            signatureDeclaration.questionToken = optional ? ts.createToken(55) : undefined;
+            signatureDeclaration.questionToken = optional ? ts.createToken(55 /* QuestionToken */) : undefined;
             signatureDeclaration.body = body;
             return signatureDeclaration;
         }
         function createMethodFromCallExpression(_a, methodName, inJs, makeStatic, preferences) {
-            var typeArguments = _a.typeArguments, args = _a.arguments;
-            return ts.createMethod(undefined, makeStatic ? [ts.createToken(115)] : undefined, undefined, methodName, undefined, inJs ? undefined : ts.map(typeArguments, function (_, i) {
-                return ts.createTypeParameterDeclaration(84 + typeArguments.length - 1 <= 90 ? String.fromCharCode(84 + i) : "T" + i);
-            }), createDummyParameters(args.length, undefined, undefined, inJs), inJs ? undefined : ts.createKeywordTypeNode(119), createStubbedMethodBody(preferences));
+            var typeArguments = _a.typeArguments, args = _a.arguments, parent = _a.parent;
+            return ts.createMethod(
+            /*decorators*/ undefined, 
+            /*modifiers*/ makeStatic ? [ts.createToken(115 /* StaticKeyword */)] : undefined, 
+            /*asteriskToken*/ ts.isYieldExpression(parent) ? ts.createToken(39 /* AsteriskToken */) : undefined, methodName, 
+            /*questionToken*/ undefined, 
+            /*typeParameters*/ inJs ? undefined : ts.map(typeArguments, function (_, i) {
+                return ts.createTypeParameterDeclaration(84 /* T */ + typeArguments.length - 1 <= 90 /* Z */ ? String.fromCharCode(84 /* T */ + i) : "T" + i);
+            }), 
+            /*parameters*/ createDummyParameters(args.length, /*names*/ undefined, /*minArgumentCount*/ undefined, inJs), 
+            /*type*/ inJs ? undefined : ts.createKeywordTypeNode(119 /* AnyKeyword */), createStubbedMethodBody(preferences));
         }
         codefix.createMethodFromCallExpression = createMethodFromCallExpression;
         function createDummyParameters(argCount, names, minArgumentCount, inJs) {
             var parameters = [];
             for (var i = 0; i < argCount; i++) {
-                var newParameter = ts.createParameter(undefined, undefined, undefined, names && names[i] || "arg" + i, minArgumentCount !== undefined && i >= minArgumentCount ? ts.createToken(55) : undefined, inJs ? undefined : ts.createKeywordTypeNode(119), undefined);
+                var newParameter = ts.createParameter(
+                /*decorators*/ undefined, 
+                /*modifiers*/ undefined, 
+                /*dotDotDotToken*/ undefined, 
+                /*name*/ names && names[i] || "arg" + i, 
+                /*questionToken*/ minArgumentCount !== undefined && i >= minArgumentCount ? ts.createToken(55 /* QuestionToken */) : undefined, 
+                /*type*/ inJs ? undefined : ts.createKeywordTypeNode(119 /* AnyKeyword */), 
+                /*initializer*/ undefined);
                 parameters.push(newParameter);
             }
             return parameters;
         }
         function createMethodImplementingSignatures(signatures, name, optional, modifiers, preferences) {
+            /** This is *a* signature with the maximal number of arguments,
+             * such that if there is a "maximal" signature without rest arguments,
+             * this is one of them.
+             */
             var maxArgsSignature = signatures[0];
             var minArgumentCount = signatures[0].minArgumentCount;
             var someSigHasRestParameter = false;
-            for (var _i = 0, signatures_9 = signatures; _i < signatures_9.length; _i++) {
-                var sig = signatures_9[_i];
+            for (var _i = 0, signatures_2 = signatures; _i < signatures_2.length; _i++) {
+                var sig = signatures_2[_i];
                 minArgumentCount = Math.min(sig.minArgumentCount, minArgumentCount);
                 if (sig.hasRestParameter) {
                     someSigHasRestParameter = true;
@@ -86183,44 +104421,61 @@ var ts;
             }
             var maxNonRestArgs = maxArgsSignature.parameters.length - (maxArgsSignature.hasRestParameter ? 1 : 0);
             var maxArgsParameterSymbolNames = maxArgsSignature.parameters.map(function (symbol) { return symbol.name; });
-            var parameters = createDummyParameters(maxNonRestArgs, maxArgsParameterSymbolNames, minArgumentCount, false);
+            var parameters = createDummyParameters(maxNonRestArgs, maxArgsParameterSymbolNames, minArgumentCount, /*inJs*/ false);
             if (someSigHasRestParameter) {
-                var anyArrayType = ts.createArrayTypeNode(ts.createKeywordTypeNode(119));
-                var restParameter = ts.createParameter(undefined, undefined, ts.createToken(24), maxArgsParameterSymbolNames[maxNonRestArgs] || "rest", maxNonRestArgs >= minArgumentCount ? ts.createToken(55) : undefined, anyArrayType, undefined);
+                var anyArrayType = ts.createArrayTypeNode(ts.createKeywordTypeNode(119 /* AnyKeyword */));
+                var restParameter = ts.createParameter(
+                /*decorators*/ undefined, 
+                /*modifiers*/ undefined, ts.createToken(24 /* DotDotDotToken */), maxArgsParameterSymbolNames[maxNonRestArgs] || "rest", 
+                /*questionToken*/ maxNonRestArgs >= minArgumentCount ? ts.createToken(55 /* QuestionToken */) : undefined, anyArrayType, 
+                /*initializer*/ undefined);
                 parameters.push(restParameter);
             }
-            return createStubbedMethod(modifiers, name, optional, undefined, parameters, undefined, preferences);
+            return createStubbedMethod(modifiers, name, optional, 
+            /*typeParameters*/ undefined, parameters, 
+            /*returnType*/ undefined, preferences);
         }
         function createStubbedMethod(modifiers, name, optional, typeParameters, parameters, returnType, preferences) {
-            return ts.createMethod(undefined, modifiers, undefined, name, optional ? ts.createToken(55) : undefined, typeParameters, parameters, returnType, createStubbedMethodBody(preferences));
+            return ts.createMethod(
+            /*decorators*/ undefined, modifiers, 
+            /*asteriskToken*/ undefined, name, optional ? ts.createToken(55 /* QuestionToken */) : undefined, typeParameters, parameters, returnType, createStubbedMethodBody(preferences));
         }
         function createStubbedMethodBody(preferences) {
-            return ts.createBlock([ts.createThrow(ts.createNew(ts.createIdentifier("Error"), undefined, [ts.createLiteral("Method not implemented.", preferences.quotePreference === "single")]))], true);
+            return ts.createBlock([ts.createThrow(ts.createNew(ts.createIdentifier("Error"), 
+                /*typeArguments*/ undefined, [ts.createLiteral("Method not implemented.", /*isSingleQuote*/ preferences.quotePreference === "single")]))], 
+            /*multiline*/ true);
         }
         function createVisibilityModifier(flags) {
-            if (flags & 4) {
-                return ts.createToken(114);
+            if (flags & 4 /* Public */) {
+                return ts.createToken(114 /* PublicKeyword */);
             }
-            else if (flags & 16) {
-                return ts.createToken(113);
+            else if (flags & 16 /* Protected */) {
+                return ts.createToken(113 /* ProtectedKeyword */);
             }
             return undefined;
         }
     })(codefix = ts.codefix || (ts.codefix = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var codefix;
     (function (codefix) {
         var fixId = "inferFromUsage";
         var errorCodes = [
+            // Variable declarations
             ts.Diagnostics.Variable_0_implicitly_has_type_1_in_some_locations_where_its_type_cannot_be_determined.code,
+            // Variable uses
             ts.Diagnostics.Variable_0_implicitly_has_an_1_type.code,
+            // Parameter declarations
             ts.Diagnostics.Parameter_0_implicitly_has_an_1_type.code,
             ts.Diagnostics.Rest_parameter_0_implicitly_has_an_any_type.code,
+            // Get Accessor declarations
             ts.Diagnostics.Property_0_implicitly_has_type_any_because_its_get_accessor_lacks_a_return_type_annotation.code,
             ts.Diagnostics._0_which_lacks_return_type_annotation_implicitly_has_an_1_return_type.code,
+            // Set Accessor declarations
             ts.Diagnostics.Property_0_implicitly_has_type_any_because_its_set_accessor_lacks_a_parameter_type_annotation.code,
+            // Property declarations
             ts.Diagnostics.Member_0_implicitly_has_an_1_type.code,
         ];
         codefix.registerCodeFix({
@@ -86228,11 +104483,11 @@ var ts;
             getCodeActions: function (context) {
                 var sourceFile = context.sourceFile, program = context.program, start = context.span.start, errorCode = context.errorCode, cancellationToken = context.cancellationToken;
                 if (ts.isSourceFileJavaScript(sourceFile)) {
-                    return undefined;
+                    return undefined; // TODO: GH#20113
                 }
-                var token = ts.getTokenAtPosition(sourceFile, start, false);
+                var token = ts.getTokenAtPosition(sourceFile, start, /*includeJsDocComment*/ false);
                 var declaration;
-                var changes = ts.textChanges.ChangeTracker.with(context, function (changes) { declaration = doChange(changes, sourceFile, token, errorCode, program, cancellationToken, ts.returnTrue); });
+                var changes = ts.textChanges.ChangeTracker.with(context, function (changes) { declaration = doChange(changes, sourceFile, token, errorCode, program, cancellationToken, /*markSeenseen*/ ts.returnTrue); });
                 return changes.length === 0 ? undefined
                     : [codefix.createCodeFixAction(fixId, changes, [getDiagnostic(errorCode, token), ts.getNameOfDeclaration(declaration).getText(sourceFile)], fixId, ts.Diagnostics.Infer_all_types_from_usage)];
             },
@@ -86241,14 +104496,14 @@ var ts;
                 var sourceFile = context.sourceFile, program = context.program, cancellationToken = context.cancellationToken;
                 var markSeen = ts.nodeSeenTracker();
                 return codefix.codeFixAll(context, errorCodes, function (changes, err) {
-                    doChange(changes, sourceFile, ts.getTokenAtPosition(err.file, err.start, false), err.code, program, cancellationToken, markSeen);
+                    doChange(changes, sourceFile, ts.getTokenAtPosition(err.file, err.start, /*includeJsDocComment*/ false), err.code, program, cancellationToken, markSeen);
                 });
             },
         });
         function getDiagnostic(errorCode, token) {
             switch (errorCode) {
                 case ts.Diagnostics.Parameter_0_implicitly_has_an_1_type.code:
-                    return ts.isSetAccessor(ts.getContainingFunction(token)) ? ts.Diagnostics.Infer_type_of_0_from_usage : ts.Diagnostics.Infer_parameter_types_from_usage;
+                    return ts.isSetAccessor(ts.getContainingFunction(token)) ? ts.Diagnostics.Infer_type_of_0_from_usage : ts.Diagnostics.Infer_parameter_types_from_usage; // TODO: GH#18217
                 case ts.Diagnostics.Rest_parameter_0_implicitly_has_an_any_type.code:
                     return ts.Diagnostics.Infer_parameter_types_from_usage;
                 default:
@@ -86256,14 +104511,15 @@ var ts;
             }
         }
         function doChange(changes, sourceFile, token, errorCode, program, cancellationToken, markSeen) {
-            if (!ts.isParameterPropertyModifier(token.kind) && token.kind !== 71 && token.kind !== 24) {
+            if (!ts.isParameterPropertyModifier(token.kind) && token.kind !== 71 /* Identifier */ && token.kind !== 24 /* DotDotDotToken */) {
                 return undefined;
             }
             var parent = token.parent;
             switch (errorCode) {
+                // Variable and Property declarations
                 case ts.Diagnostics.Member_0_implicitly_has_an_1_type.code:
                 case ts.Diagnostics.Variable_0_implicitly_has_type_1_in_some_locations_where_its_type_cannot_be_determined.code:
-                    if ((ts.isVariableDeclaration(parent) && markSeen(parent)) || ts.isPropertyDeclaration(parent) || ts.isPropertySignature(parent)) {
+                    if ((ts.isVariableDeclaration(parent) && markSeen(parent)) || ts.isPropertyDeclaration(parent) || ts.isPropertySignature(parent)) { // handle bad location
                         annotateVariableDeclaration(changes, sourceFile, parent, program, cancellationToken);
                         return parent;
                     }
@@ -86282,11 +104538,13 @@ var ts;
                 return undefined;
             }
             switch (errorCode) {
+                // Parameter declarations
                 case ts.Diagnostics.Parameter_0_implicitly_has_an_1_type.code:
                     if (ts.isSetAccessor(containingFunction)) {
                         annotateSetAccessor(changes, sourceFile, containingFunction, program, cancellationToken);
                         return containingFunction;
                     }
+                // falls through
                 case ts.Diagnostics.Rest_parameter_0_implicitly_has_an_any_type.code:
                     if (markSeen(containingFunction)) {
                         var param = ts.cast(parent, ts.isParameter);
@@ -86294,6 +104552,7 @@ var ts;
                         return param;
                     }
                     return undefined;
+                // Get Accessor declarations
                 case ts.Diagnostics.Property_0_implicitly_has_type_any_because_its_get_accessor_lacks_a_return_type_annotation.code:
                 case ts.Diagnostics._0_which_lacks_return_type_annotation_implicitly_has_an_1_return_type.code:
                     if (ts.isGetAccessor(containingFunction) && ts.isIdentifier(containingFunction.name)) {
@@ -86301,6 +104560,7 @@ var ts;
                         return containingFunction;
                     }
                     return undefined;
+                // Set Accessor declarations
                 case ts.Diagnostics.Property_0_implicitly_has_type_any_because_its_set_accessor_lacks_a_parameter_type_annotation.code:
                     if (ts.isSetAccessor(containingFunction)) {
                         annotateSetAccessor(changes, sourceFile, containingFunction, program, cancellationToken);
@@ -86318,11 +104578,11 @@ var ts;
         }
         function isApplicableFunctionForInference(declaration) {
             switch (declaration.kind) {
-                case 234:
-                case 154:
-                case 155:
+                case 234 /* FunctionDeclaration */:
+                case 154 /* MethodDeclaration */:
+                case 155 /* Constructor */:
                     return true;
-                case 192:
+                case 192 /* FunctionExpression */:
                     return !!declaration.name;
             }
             return false;
@@ -86333,6 +104593,7 @@ var ts;
             }
             var types = inferTypeForParametersFromUsage(containingFunction, sourceFile, program, cancellationToken) ||
                 containingFunction.parameters.map(function (p) { return ts.isIdentifier(p.name) ? inferTypeForVariableFromUsage(p.name, program, cancellationToken) : undefined; });
+            // We didn't actually find a set of type inference positions matching each parameter position
             if (!types || containingFunction.parameters.length !== types.length) {
                 return;
             }
@@ -86358,9 +104619,10 @@ var ts;
         function getTypeNodeIfAccessible(type, enclosingScope, checker) {
             var typeIsAccessible = true;
             var notAccessible = function () { typeIsAccessible = false; };
-            var res = checker.typeToTypeNode(type, enclosingScope, undefined, {
+            var res = checker.typeToTypeNode(type, enclosingScope, /*flags*/ undefined, {
                 trackSymbol: function (symbol, declaration, meaning) {
-                    typeIsAccessible = typeIsAccessible && checker.isSymbolAccessible(symbol, declaration, meaning, false).accessibility === 0;
+                    // TODO: GH#18217
+                    typeIsAccessible = typeIsAccessible && checker.isSymbolAccessible(symbol, declaration, meaning, /*shouldComputeAliasToMarkVisible*/ false).accessibility === 0 /* Accessible */;
                 },
                 reportInaccessibleThisError: notAccessible,
                 reportPrivateInBaseOfClassExpression: notAccessible,
@@ -86369,6 +104631,7 @@ var ts;
             return typeIsAccessible ? res : undefined;
         }
         function getReferences(token, program, cancellationToken) {
+            // Position shouldn't matter since token is not a SourceFile.
             return ts.mapDefined(ts.FindAllReferences.getReferenceEntriesForNode(-1, token, program, program.getSourceFiles(), cancellationToken), function (entry) {
                 return entry.type === "node" ? ts.tryCast(entry.node, ts.isIdentifier) : undefined;
             });
@@ -86378,13 +104641,13 @@ var ts;
         }
         function inferTypeForParametersFromUsage(containingFunction, sourceFile, program, cancellationToken) {
             switch (containingFunction.kind) {
-                case 155:
-                case 192:
-                case 234:
-                case 154:
-                    var isConstructor = containingFunction.kind === 155;
+                case 155 /* Constructor */:
+                case 192 /* FunctionExpression */:
+                case 234 /* FunctionDeclaration */:
+                case 154 /* MethodDeclaration */:
+                    var isConstructor = containingFunction.kind === 155 /* Constructor */;
                     var searchToken = isConstructor ?
-                        ts.findChildOfKind(containingFunction, 123, sourceFile) :
+                        ts.findChildOfKind(containingFunction, 123 /* ConstructorKeyword */, sourceFile) :
                         containingFunction.name;
                     if (searchToken) {
                         return InferFromReference.inferTypeForParametersFromReferences(getReferences(searchToken, program, cancellationToken), containingFunction, program.getTypeChecker(), cancellationToken);
@@ -86416,7 +104679,7 @@ var ts;
                     cancellationToken.throwIfCancellationRequested();
                     inferTypeFromContext(reference, checker, usageContext);
                 }
-                var isConstructor = declaration.kind === 155;
+                var isConstructor = declaration.kind === 155 /* Constructor */;
                 var callContexts = isConstructor ? usageContext.constructContexts : usageContext.callContexts;
                 return callContexts && declaration.parameters.map(function (parameter, parameterIndex) {
                     var types = [];
@@ -86438,7 +104701,7 @@ var ts;
                     if (!types.length) {
                         return undefined;
                     }
-                    var type = checker.getWidenedType(checker.getUnionType(types, 2));
+                    var type = checker.getWidenedType(checker.getUnionType(types, 2 /* Subtype */));
                     return isRest ? checker.createArrayType(type) : type;
                 });
             }
@@ -86448,21 +104711,21 @@ var ts;
                     node = node.parent;
                 }
                 switch (node.parent.kind) {
-                    case 199:
+                    case 199 /* PostfixUnaryExpression */:
                         usageContext.isNumber = true;
                         break;
-                    case 198:
+                    case 198 /* PrefixUnaryExpression */:
                         inferTypeFromPrefixUnaryExpressionContext(node.parent, usageContext);
                         break;
-                    case 200:
+                    case 200 /* BinaryExpression */:
                         inferTypeFromBinaryExpressionContext(node, node.parent, checker, usageContext);
                         break;
-                    case 266:
-                    case 267:
+                    case 266 /* CaseClause */:
+                    case 267 /* DefaultClause */:
                         inferTypeFromSwitchStatementLabelContext(node.parent, checker, usageContext);
                         break;
-                    case 187:
-                    case 188:
+                    case 187 /* CallExpression */:
+                    case 188 /* NewExpression */:
                         if (node.parent.expression === node) {
                             inferTypeFromCallExpressionContext(node.parent, checker, usageContext);
                         }
@@ -86470,21 +104733,22 @@ var ts;
                             inferTypeFromContextualType(node, checker, usageContext);
                         }
                         break;
-                    case 185:
+                    case 185 /* PropertyAccessExpression */:
                         inferTypeFromPropertyAccessExpressionContext(node.parent, checker, usageContext);
                         break;
-                    case 186:
+                    case 186 /* ElementAccessExpression */:
                         inferTypeFromPropertyElementExpressionContext(node.parent, node, checker, usageContext);
                         break;
-                    case 232: {
+                    case 232 /* VariableDeclaration */: {
                         var _a = node.parent, name = _a.name, initializer = _a.initializer;
                         if (node === name) {
-                            if (initializer) {
+                            if (initializer) { // This can happen for `let x = null;` which still has an implicit-any error.
                                 addCandidateType(usageContext, checker.getTypeAtLocation(initializer));
                             }
                             break;
                         }
                     }
+                    // falls through
                     default:
                         return inferTypeFromContextualType(node, checker, usageContext);
                 }
@@ -86496,90 +104760,104 @@ var ts;
             }
             function inferTypeFromPrefixUnaryExpressionContext(node, usageContext) {
                 switch (node.operator) {
-                    case 43:
-                    case 44:
-                    case 38:
-                    case 52:
+                    case 43 /* PlusPlusToken */:
+                    case 44 /* MinusMinusToken */:
+                    case 38 /* MinusToken */:
+                    case 52 /* TildeToken */:
                         usageContext.isNumber = true;
                         break;
-                    case 37:
+                    case 37 /* PlusToken */:
                         usageContext.isNumberOrString = true;
                         break;
+                    // case SyntaxKind.ExclamationToken:
+                    // no inferences here;
                 }
             }
             function inferTypeFromBinaryExpressionContext(node, parent, checker, usageContext) {
                 switch (parent.operatorToken.kind) {
-                    case 40:
-                    case 39:
-                    case 41:
-                    case 42:
-                    case 45:
-                    case 46:
-                    case 47:
-                    case 48:
-                    case 49:
-                    case 50:
-                    case 60:
-                    case 62:
-                    case 61:
-                    case 63:
-                    case 64:
-                    case 68:
-                    case 69:
-                    case 70:
-                    case 65:
-                    case 67:
-                    case 66:
-                    case 38:
-                    case 27:
-                    case 30:
-                    case 29:
-                    case 31:
+                    // ExponentiationOperator
+                    case 40 /* AsteriskAsteriskToken */:
+                    // MultiplicativeOperator
+                    case 39 /* AsteriskToken */:
+                    case 41 /* SlashToken */:
+                    case 42 /* PercentToken */:
+                    // ShiftOperator
+                    case 45 /* LessThanLessThanToken */:
+                    case 46 /* GreaterThanGreaterThanToken */:
+                    case 47 /* GreaterThanGreaterThanGreaterThanToken */:
+                    // BitwiseOperator
+                    case 48 /* AmpersandToken */:
+                    case 49 /* BarToken */:
+                    case 50 /* CaretToken */:
+                    // CompoundAssignmentOperator
+                    case 60 /* MinusEqualsToken */:
+                    case 62 /* AsteriskAsteriskEqualsToken */:
+                    case 61 /* AsteriskEqualsToken */:
+                    case 63 /* SlashEqualsToken */:
+                    case 64 /* PercentEqualsToken */:
+                    case 68 /* AmpersandEqualsToken */:
+                    case 69 /* BarEqualsToken */:
+                    case 70 /* CaretEqualsToken */:
+                    case 65 /* LessThanLessThanEqualsToken */:
+                    case 67 /* GreaterThanGreaterThanGreaterThanEqualsToken */:
+                    case 66 /* GreaterThanGreaterThanEqualsToken */:
+                    // AdditiveOperator
+                    case 38 /* MinusToken */:
+                    // RelationalOperator
+                    case 27 /* LessThanToken */:
+                    case 30 /* LessThanEqualsToken */:
+                    case 29 /* GreaterThanToken */:
+                    case 31 /* GreaterThanEqualsToken */:
                         var operandType = checker.getTypeAtLocation(parent.left === node ? parent.right : parent.left);
-                        if (operandType.flags & 544) {
+                        if (operandType.flags & 544 /* EnumLike */) {
                             addCandidateType(usageContext, operandType);
                         }
                         else {
                             usageContext.isNumber = true;
                         }
                         break;
-                    case 59:
-                    case 37:
+                    case 59 /* PlusEqualsToken */:
+                    case 37 /* PlusToken */:
                         var otherOperandType = checker.getTypeAtLocation(parent.left === node ? parent.right : parent.left);
-                        if (otherOperandType.flags & 544) {
+                        if (otherOperandType.flags & 544 /* EnumLike */) {
                             addCandidateType(usageContext, otherOperandType);
                         }
-                        else if (otherOperandType.flags & 168) {
+                        else if (otherOperandType.flags & 168 /* NumberLike */) {
                             usageContext.isNumber = true;
                         }
-                        else if (otherOperandType.flags & 68) {
+                        else if (otherOperandType.flags & 68 /* StringLike */) {
                             usageContext.isString = true;
                         }
                         else {
                             usageContext.isNumberOrString = true;
                         }
                         break;
-                    case 58:
-                    case 32:
-                    case 34:
-                    case 35:
-                    case 33:
+                    //  AssignmentOperators
+                    case 58 /* EqualsToken */:
+                    case 32 /* EqualsEqualsToken */:
+                    case 34 /* EqualsEqualsEqualsToken */:
+                    case 35 /* ExclamationEqualsEqualsToken */:
+                    case 33 /* ExclamationEqualsToken */:
                         addCandidateType(usageContext, checker.getTypeAtLocation(parent.left === node ? parent.right : parent.left));
                         break;
-                    case 92:
+                    case 92 /* InKeyword */:
                         if (node === parent.left) {
                             usageContext.isString = true;
                         }
                         break;
-                    case 54:
+                    // LogicalOperator
+                    case 54 /* BarBarToken */:
                         if (node === parent.left &&
-                            (node.parent.parent.kind === 232 || ts.isAssignmentExpression(node.parent.parent, true))) {
+                            (node.parent.parent.kind === 232 /* VariableDeclaration */ || ts.isAssignmentExpression(node.parent.parent, /*excludeCompoundAssignment*/ true))) {
+                            // var x = x || {};
+                            // TODO: use getFalsyflagsOfType
                             addCandidateType(usageContext, checker.getTypeAtLocation(parent.right));
                         }
                         break;
-                    case 53:
-                    case 26:
-                    case 93:
+                    case 53 /* AmpersandAmpersandToken */:
+                    case 26 /* CommaToken */:
+                    case 93 /* InstanceOfKeyword */:
+                        // nothing to infer here
                         break;
                 }
             }
@@ -86598,7 +104876,7 @@ var ts;
                     }
                 }
                 inferTypeFromContext(parent, checker, callContext.returnType);
-                if (parent.kind === 187) {
+                if (parent.kind === 187 /* CallExpression */) {
                     (usageContext.callContexts || (usageContext.callContexts = [])).push(callContext);
                 }
                 else {
@@ -86623,7 +104901,7 @@ var ts;
                     var indexType = checker.getTypeAtLocation(parent);
                     var indexUsageContext = {};
                     inferTypeFromContext(parent, checker, indexUsageContext);
-                    if (indexType.flags & 168) {
+                    if (indexType.flags & 168 /* NumberLike */) {
                         usageContext.numberIndexContext = indexUsageContext;
                     }
                     else {
@@ -86642,27 +104920,27 @@ var ts;
                     return checker.getStringType();
                 }
                 else if (usageContext.candidateTypes) {
-                    return checker.getWidenedType(checker.getUnionType(usageContext.candidateTypes.map(function (t) { return checker.getBaseTypeOfLiteralType(t); }), 2));
+                    return checker.getWidenedType(checker.getUnionType(usageContext.candidateTypes.map(function (t) { return checker.getBaseTypeOfLiteralType(t); }), 2 /* Subtype */));
                 }
                 else if (usageContext.properties && hasCallContext(usageContext.properties.get("then"))) {
-                    var paramType = getParameterTypeFromCallContexts(0, usageContext.properties.get("then").callContexts, false, checker);
+                    var paramType = getParameterTypeFromCallContexts(0, usageContext.properties.get("then").callContexts, /*isRestParameter*/ false, checker); // TODO: GH#18217
                     var types = paramType.getCallSignatures().map(function (c) { return c.getReturnType(); });
-                    return checker.createPromiseType(types.length ? checker.getUnionType(types, 2) : checker.getAnyType());
+                    return checker.createPromiseType(types.length ? checker.getUnionType(types, 2 /* Subtype */) : checker.getAnyType());
                 }
                 else if (usageContext.properties && hasCallContext(usageContext.properties.get("push"))) {
-                    return checker.createArrayType(getParameterTypeFromCallContexts(0, usageContext.properties.get("push").callContexts, false, checker));
+                    return checker.createArrayType(getParameterTypeFromCallContexts(0, usageContext.properties.get("push").callContexts, /*isRestParameter*/ false, checker));
                 }
                 else if (usageContext.properties || usageContext.callContexts || usageContext.constructContexts || usageContext.numberIndexContext || usageContext.stringIndexContext) {
-                    var members_6 = ts.createUnderscoreEscapedMap();
+                    var members_1 = ts.createUnderscoreEscapedMap();
                     var callSignatures = [];
                     var constructSignatures = [];
                     var stringIndexInfo = void 0;
                     var numberIndexInfo = void 0;
                     if (usageContext.properties) {
                         usageContext.properties.forEach(function (context, name) {
-                            var symbol = checker.createSymbol(4, name);
+                            var symbol = checker.createSymbol(4 /* Property */, name);
                             symbol.type = getTypeFromUsageContext(context, checker) || checker.getAnyType();
-                            members_6.set(name, symbol);
+                            members_1.set(name, symbol);
                         });
                     }
                     if (usageContext.callContexts) {
@@ -86678,12 +104956,12 @@ var ts;
                         }
                     }
                     if (usageContext.numberIndexContext) {
-                        numberIndexInfo = checker.createIndexInfo(getTypeFromUsageContext(usageContext.numberIndexContext, checker), false);
+                        numberIndexInfo = checker.createIndexInfo(getTypeFromUsageContext(usageContext.numberIndexContext, checker), /*isReadonly*/ false); // TODO: GH#18217
                     }
                     if (usageContext.stringIndexContext) {
-                        stringIndexInfo = checker.createIndexInfo(getTypeFromUsageContext(usageContext.stringIndexContext, checker), false);
+                        stringIndexInfo = checker.createIndexInfo(getTypeFromUsageContext(usageContext.stringIndexContext, checker), /*isReadonly*/ false);
                     }
-                    return checker.createAnonymousType(undefined, members_6, callSignatures, constructSignatures, stringIndexInfo, numberIndexInfo);
+                    return checker.createAnonymousType(/*symbol*/ undefined, members_1, callSignatures, constructSignatures, stringIndexInfo, numberIndexInfo); // TODO: GH#18217
                 }
                 else {
                     return undefined;
@@ -86705,7 +104983,7 @@ var ts;
                     }
                 }
                 if (types.length) {
-                    var type = checker.getWidenedType(checker.getUnionType(types, 2));
+                    var type = checker.getWidenedType(checker.getUnionType(types, 2 /* Subtype */));
                     return isRestParameter ? checker.createArrayType(type) : type;
                 }
                 return undefined;
@@ -86713,15 +104991,16 @@ var ts;
             function getSignatureFromCallContext(callContext, checker) {
                 var parameters = [];
                 for (var i = 0; i < callContext.argumentTypes.length; i++) {
-                    var symbol = checker.createSymbol(1, ts.escapeLeadingUnderscores("arg" + i));
+                    var symbol = checker.createSymbol(1 /* FunctionScopedVariable */, ts.escapeLeadingUnderscores("arg" + i));
                     symbol.type = checker.getWidenedType(checker.getBaseTypeOfLiteralType(callContext.argumentTypes[i]));
                     parameters.push(symbol);
                 }
                 var returnType = getTypeFromUsageContext(callContext.returnType, checker) || checker.getVoidType();
-                return checker.createSignature(undefined, undefined, undefined, parameters, returnType, undefined, callContext.argumentTypes.length, false, false);
+                // TODO: GH#18217
+                return checker.createSignature(/*declaration*/ undefined, /*typeParameters*/ undefined, /*thisParameter*/ undefined, parameters, returnType, /*typePredicate*/ undefined, callContext.argumentTypes.length, /*hasRestParameter*/ false, /*hasLiteralTypes*/ false);
             }
             function addCandidateType(context, type) {
-                if (type && !(type.flags & 1) && !(type.flags & 32768)) {
+                if (type && !(type.flags & 1 /* Any */) && !(type.flags & 32768 /* Never */)) {
                     (context.candidateTypes || (context.candidateTypes = [])).push(type);
                 }
             }
@@ -86731,6 +105010,7 @@ var ts;
         })(InferFromReference || (InferFromReference = {}));
     })(codefix = ts.codefix || (ts.codefix = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var codefix;
@@ -86742,8 +105022,12 @@ var ts;
         });
         function getActionsForInvalidImport(context) {
             var sourceFile = context.sourceFile;
-            var node = ts.getTokenAtPosition(sourceFile, context.span.start, false).parent;
+            // This is the whole import statement, eg:
+            // import * as Bluebird from 'bluebird';
+            // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+            var node = ts.getTokenAtPosition(sourceFile, context.span.start, /*includeJsDocComment*/ false).parent;
             if (!ts.isImportDeclaration(node)) {
+                // No import quick fix for import calls
                 return [];
             }
             return getCodeFixesForImportDeclaration(context, node);
@@ -86753,9 +105037,13 @@ var ts;
             var namespace = ts.getNamespaceDeclarationNode(node);
             var opts = context.program.getCompilerOptions();
             var variations = [];
-            variations.push(createAction(context, sourceFile, node, ts.makeImport(namespace.name, undefined, node.moduleSpecifier, context.preferences)));
+            // import Bluebird from "bluebird";
+            variations.push(createAction(context, sourceFile, node, ts.makeImport(namespace.name, /*namedImports*/ undefined, node.moduleSpecifier, ts.getQuotePreference(sourceFile, context.preferences))));
             if (ts.getEmitModuleKind(opts) === ts.ModuleKind.CommonJS) {
-                variations.push(createAction(context, sourceFile, node, ts.createImportEqualsDeclaration(undefined, undefined, namespace.name, ts.createExternalModuleReference(node.moduleSpecifier))));
+                // import Bluebird = require("bluebird");
+                variations.push(createAction(context, sourceFile, node, ts.createImportEqualsDeclaration(
+                /*decorators*/ undefined, 
+                /*modifiers*/ undefined, namespace.name, ts.createExternalModuleReference(node.moduleSpecifier))));
             }
             return variations;
         }
@@ -86772,18 +105060,18 @@ var ts;
         });
         function getActionsForUsageOfInvalidImport(context) {
             var sourceFile = context.sourceFile;
-            var targetKind = ts.Diagnostics.Cannot_invoke_an_expression_whose_type_lacks_a_call_signature_Type_0_has_no_compatible_call_signatures.code === context.errorCode ? 187 : 188;
-            var node = ts.findAncestor(ts.getTokenAtPosition(sourceFile, context.span.start, false), function (a) { return a.kind === targetKind && a.getStart() === context.span.start && a.getEnd() === (context.span.start + context.span.length); });
+            var targetKind = ts.Diagnostics.Cannot_invoke_an_expression_whose_type_lacks_a_call_signature_Type_0_has_no_compatible_call_signatures.code === context.errorCode ? 187 /* CallExpression */ : 188 /* NewExpression */;
+            var node = ts.findAncestor(ts.getTokenAtPosition(sourceFile, context.span.start, /*includeJsDocComment*/ false), function (a) { return a.kind === targetKind && a.getStart() === context.span.start && a.getEnd() === (context.span.start + context.span.length); });
             if (!node) {
                 return [];
             }
             var expr = node.expression;
-            var type = context.program.getTypeChecker().getTypeAtLocation(expr);
+            var type = context.program.getTypeChecker().getTypeAtLocation(expr); // TODO: GH#18217
             if (!(type.symbol && type.symbol.originatingImport)) {
                 return [];
             }
             var fixes = [];
-            var relatedImport = type.symbol.originatingImport;
+            var relatedImport = type.symbol.originatingImport; // TODO: GH#18217
             if (!ts.isImportCall(relatedImport)) {
                 ts.addRange(fixes, getCodeFixesForImportDeclaration(context, relatedImport));
             }
@@ -86793,6 +105081,7 @@ var ts;
         }
     })(codefix = ts.codefix || (ts.codefix = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var codefix;
@@ -86842,7 +105131,7 @@ var ts;
             },
         });
         function getPropertyDeclaration(sourceFile, pos) {
-            var token = ts.getTokenAtPosition(sourceFile, pos, false);
+            var token = ts.getTokenAtPosition(sourceFile, pos, /*includeJsDocComment*/ false);
             return ts.isIdentifier(token) ? ts.cast(token.parent, ts.isPropertyDeclaration) : undefined;
         }
         function getActionForAddMissingDefiniteAssignmentAssertion(context, propertyDeclaration) {
@@ -86850,7 +105139,7 @@ var ts;
             return codefix.createCodeFixAction(fixName, changes, [ts.Diagnostics.Add_definite_assignment_assertion_to_property_0, propertyDeclaration.getText()], fixIdAddDefiniteAssignmentAssertions, ts.Diagnostics.Add_definite_assignment_assertions_to_all_uninitialized_properties);
         }
         function addDefiniteAssignmentAssertion(changeTracker, propertyDeclarationSourceFile, propertyDeclaration) {
-            var property = ts.updateProperty(propertyDeclaration, propertyDeclaration.decorators, propertyDeclaration.modifiers, propertyDeclaration.name, ts.createToken(51), propertyDeclaration.type, propertyDeclaration.initializer);
+            var property = ts.updateProperty(propertyDeclaration, propertyDeclaration.decorators, propertyDeclaration.modifiers, propertyDeclaration.name, ts.createToken(51 /* ExclamationToken */), propertyDeclaration.type, propertyDeclaration.initializer);
             changeTracker.replaceNode(propertyDeclarationSourceFile, propertyDeclaration, property);
         }
         function getActionForAddMissingUndefinedType(context, propertyDeclaration) {
@@ -86858,8 +105147,8 @@ var ts;
             return codefix.createCodeFixAction(fixName, changes, [ts.Diagnostics.Add_undefined_type_to_property_0, propertyDeclaration.name.getText()], fixIdAddUndefinedType, ts.Diagnostics.Add_undefined_type_to_all_uninitialized_properties);
         }
         function addUndefinedType(changeTracker, propertyDeclarationSourceFile, propertyDeclaration) {
-            var undefinedTypeNode = ts.createKeywordTypeNode(140);
-            var type = propertyDeclaration.type;
+            var undefinedTypeNode = ts.createKeywordTypeNode(140 /* UndefinedKeyword */);
+            var type = propertyDeclaration.type; // TODO: GH#18217
             var types = ts.isUnionTypeNode(type) ? type.types.concat(undefinedTypeNode) : [type, undefinedTypeNode];
             changeTracker.replaceNode(propertyDeclarationSourceFile, type, ts.createUnionTypeNode(types));
         }
@@ -86876,17 +105165,11 @@ var ts;
             changeTracker.replaceNode(propertyDeclarationSourceFile, propertyDeclaration, property);
         }
         function getInitializer(checker, propertyDeclaration) {
-            return getDefaultValueFromType(checker, checker.getTypeFromTypeNode(propertyDeclaration.type));
+            return getDefaultValueFromType(checker, checker.getTypeFromTypeNode(propertyDeclaration.type)); // TODO: GH#18217
         }
         function getDefaultValueFromType(checker, type) {
-            if (type.flags & 4) {
-                return ts.createLiteral("");
-            }
-            else if (type.flags & 8) {
-                return ts.createNumericLiteral("0");
-            }
-            else if (type.flags & 16) {
-                return ts.createFalse();
+            if (type.flags & 256 /* BooleanLiteral */) {
+                return type === checker.getFalseType() ? ts.createFalse() : ts.createTrue();
             }
             else if (type.isLiteral()) {
                 return ts.createLiteral(type.value);
@@ -86896,265 +105179,21 @@ var ts;
             }
             else if (type.isClass()) {
                 var classDeclaration = ts.getClassLikeDeclarationOfSymbol(type.symbol);
-                if (!classDeclaration || ts.hasModifier(classDeclaration, 128))
+                if (!classDeclaration || ts.hasModifier(classDeclaration, 128 /* Abstract */))
                     return undefined;
                 var constructorDeclaration = ts.getFirstConstructorWithBody(classDeclaration);
                 if (constructorDeclaration && constructorDeclaration.parameters.length)
                     return undefined;
-                return ts.createNew(ts.createIdentifier(type.symbol.name), undefined, undefined);
+                return ts.createNew(ts.createIdentifier(type.symbol.name), /*typeArguments*/ undefined, /*argumentsArray*/ undefined);
+            }
+            else if (checker.isArrayLikeType(type)) {
+                return ts.createArrayLiteral();
             }
             return undefined;
         }
     })(codefix = ts.codefix || (ts.codefix = {}));
 })(ts || (ts = {}));
-var ts;
-(function (ts) {
-    var moduleSpecifiers;
-    (function (moduleSpecifiers) {
-        function getModuleSpecifier(program, fromSourceFile, fromSourceFileName, toFileName, host, preferences) {
-            var info = getInfo(program.getCompilerOptions(), fromSourceFile, fromSourceFileName, host);
-            var compilerOptions = program.getCompilerOptions();
-            return getGlobalModuleSpecifier(toFileName, info, host, compilerOptions) ||
-                ts.first(getLocalModuleSpecifiers(toFileName, info, compilerOptions, preferences));
-        }
-        moduleSpecifiers.getModuleSpecifier = getModuleSpecifier;
-        function getModuleSpecifiers(moduleSymbol, program, importingSourceFile, host, preferences) {
-            var ambient = tryGetModuleNameFromAmbientModule(moduleSymbol);
-            if (ambient)
-                return [[ambient]];
-            var compilerOptions = program.getCompilerOptions();
-            var info = getInfo(compilerOptions, importingSourceFile, importingSourceFile.fileName, host);
-            var modulePaths = getAllModulePaths(program, moduleSymbol.valueDeclaration.getSourceFile());
-            var global = ts.mapDefined(modulePaths, function (moduleFileName) { return getGlobalModuleSpecifier(moduleFileName, info, host, compilerOptions); });
-            return global.length ? global.map(function (g) { return [g]; }) : modulePaths.map(function (moduleFileName) {
-                return getLocalModuleSpecifiers(moduleFileName, info, compilerOptions, preferences);
-            });
-        }
-        moduleSpecifiers.getModuleSpecifiers = getModuleSpecifiers;
-        function getInfo(compilerOptions, importingSourceFile, importingSourceFileName, host) {
-            var moduleResolutionKind = ts.getEmitModuleResolutionKind(compilerOptions);
-            var addJsExtension = usesJsExtensionOnImports(importingSourceFile);
-            var getCanonicalFileName = ts.hostGetCanonicalFileName(host);
-            var sourceDirectory = ts.getDirectoryPath(importingSourceFileName);
-            return { moduleResolutionKind: moduleResolutionKind, addJsExtension: addJsExtension, getCanonicalFileName: getCanonicalFileName, sourceDirectory: sourceDirectory };
-        }
-        function getGlobalModuleSpecifier(moduleFileName, _a, host, compilerOptions) {
-            var addJsExtension = _a.addJsExtension, getCanonicalFileName = _a.getCanonicalFileName, sourceDirectory = _a.sourceDirectory;
-            return tryGetModuleNameFromTypeRoots(compilerOptions, host, getCanonicalFileName, moduleFileName, addJsExtension)
-                || tryGetModuleNameAsNodeModule(compilerOptions, moduleFileName, host, getCanonicalFileName, sourceDirectory)
-                || compilerOptions.rootDirs && tryGetModuleNameFromRootDirs(compilerOptions.rootDirs, moduleFileName, sourceDirectory, getCanonicalFileName);
-        }
-        function getLocalModuleSpecifiers(moduleFileName, _a, compilerOptions, preferences) {
-            var moduleResolutionKind = _a.moduleResolutionKind, addJsExtension = _a.addJsExtension, getCanonicalFileName = _a.getCanonicalFileName, sourceDirectory = _a.sourceDirectory;
-            var baseUrl = compilerOptions.baseUrl, paths = compilerOptions.paths;
-            var relativePath = removeExtensionAndIndexPostFix(ts.ensurePathIsNonModuleName(ts.getRelativePathFromDirectory(sourceDirectory, moduleFileName, getCanonicalFileName)), moduleResolutionKind, addJsExtension);
-            if (!baseUrl || preferences.importModuleSpecifierPreference === "relative") {
-                return [relativePath];
-            }
-            var relativeToBaseUrl = getRelativePathIfInDirectory(moduleFileName, baseUrl, getCanonicalFileName);
-            if (!relativeToBaseUrl) {
-                return [relativePath];
-            }
-            var importRelativeToBaseUrl = removeExtensionAndIndexPostFix(relativeToBaseUrl, moduleResolutionKind, addJsExtension);
-            if (paths) {
-                var fromPaths = tryGetModuleNameFromPaths(ts.removeFileExtension(relativeToBaseUrl), importRelativeToBaseUrl, paths);
-                if (fromPaths) {
-                    return [fromPaths];
-                }
-            }
-            if (preferences.importModuleSpecifierPreference === "non-relative") {
-                return [importRelativeToBaseUrl];
-            }
-            if (preferences.importModuleSpecifierPreference !== undefined)
-                ts.Debug.assertNever(preferences.importModuleSpecifierPreference);
-            if (isPathRelativeToParent(relativeToBaseUrl)) {
-                return [relativePath];
-            }
-            var pathFromSourceToBaseUrl = ts.ensurePathIsNonModuleName(ts.getRelativePathFromDirectory(sourceDirectory, baseUrl, getCanonicalFileName));
-            var relativeFirst = getRelativePathNParents(relativePath) < getRelativePathNParents(pathFromSourceToBaseUrl);
-            return relativeFirst ? [relativePath, importRelativeToBaseUrl] : [importRelativeToBaseUrl, relativePath];
-        }
-        function usesJsExtensionOnImports(_a) {
-            var imports = _a.imports;
-            return ts.firstDefined(imports, function (_a) {
-                var text = _a.text;
-                return ts.pathIsRelative(text) ? ts.fileExtensionIs(text, ".js") : undefined;
-            }) || false;
-        }
-        function getAllModulePaths(program, _a) {
-            var fileName = _a.fileName;
-            var symlinks = ts.mapDefined(program.getSourceFiles(), function (sf) {
-                return sf.resolvedModules && ts.firstDefinedIterator(sf.resolvedModules.values(), function (res) {
-                    return res && res.resolvedFileName === fileName ? res.originalPath : undefined;
-                });
-            });
-            return symlinks.length === 0 ? [fileName] : symlinks;
-        }
-        function getRelativePathNParents(relativePath) {
-            var components = ts.getPathComponents(relativePath);
-            if (components[0] || components.length === 1)
-                return 0;
-            for (var i = 1; i < components.length; i++) {
-                if (components[i] !== "..")
-                    return i - 1;
-            }
-            return components.length - 1;
-        }
-        function tryGetModuleNameFromAmbientModule(moduleSymbol) {
-            var decl = moduleSymbol.valueDeclaration;
-            if (ts.isModuleDeclaration(decl) && ts.isStringLiteral(decl.name)) {
-                return decl.name.text;
-            }
-        }
-        function tryGetModuleNameFromPaths(relativeToBaseUrlWithIndex, relativeToBaseUrl, paths) {
-            for (var key in paths) {
-                for (var _i = 0, _a = paths[key]; _i < _a.length; _i++) {
-                    var patternText_1 = _a[_i];
-                    var pattern = ts.removeFileExtension(ts.normalizePath(patternText_1));
-                    var indexOfStar = pattern.indexOf("*");
-                    if (indexOfStar === 0 && pattern.length === 1) {
-                        continue;
-                    }
-                    else if (indexOfStar !== -1) {
-                        var prefix = pattern.substr(0, indexOfStar);
-                        var suffix = pattern.substr(indexOfStar + 1);
-                        if (relativeToBaseUrl.length >= prefix.length + suffix.length &&
-                            ts.startsWith(relativeToBaseUrl, prefix) &&
-                            ts.endsWith(relativeToBaseUrl, suffix)) {
-                            var matchedStar = relativeToBaseUrl.substr(prefix.length, relativeToBaseUrl.length - suffix.length);
-                            return key.replace("*", matchedStar);
-                        }
-                    }
-                    else if (pattern === relativeToBaseUrl || pattern === relativeToBaseUrlWithIndex) {
-                        return key;
-                    }
-                }
-            }
-        }
-        function tryGetModuleNameFromRootDirs(rootDirs, moduleFileName, sourceDirectory, getCanonicalFileName) {
-            var normalizedTargetPath = getPathRelativeToRootDirs(moduleFileName, rootDirs, getCanonicalFileName);
-            if (normalizedTargetPath === undefined) {
-                return undefined;
-            }
-            var normalizedSourcePath = getPathRelativeToRootDirs(sourceDirectory, rootDirs, getCanonicalFileName);
-            var relativePath = normalizedSourcePath !== undefined ? ts.ensurePathIsNonModuleName(ts.getRelativePathFromDirectory(normalizedSourcePath, normalizedTargetPath, getCanonicalFileName)) : normalizedTargetPath;
-            return ts.removeFileExtension(relativePath);
-        }
-        function tryGetModuleNameFromTypeRoots(options, host, getCanonicalFileName, moduleFileName, addJsExtension) {
-            var roots = ts.getEffectiveTypeRoots(options, host);
-            return ts.firstDefined(roots, function (unNormalizedTypeRoot) {
-                var typeRoot = ts.toPath(unNormalizedTypeRoot, undefined, getCanonicalFileName);
-                if (ts.startsWith(moduleFileName, typeRoot)) {
-                    return removeExtensionAndIndexPostFix(moduleFileName.substring(typeRoot.length + 1), ts.ModuleResolutionKind.NodeJs, addJsExtension);
-                }
-            });
-        }
-        function tryGetModuleNameAsNodeModule(options, moduleFileName, host, getCanonicalFileName, sourceDirectory) {
-            if (ts.getEmitModuleResolutionKind(options) !== ts.ModuleResolutionKind.NodeJs) {
-                return undefined;
-            }
-            var parts = getNodeModulePathParts(moduleFileName);
-            if (!parts) {
-                return undefined;
-            }
-            var moduleSpecifier = getDirectoryOrExtensionlessFileName(moduleFileName);
-            if (!ts.startsWith(sourceDirectory, moduleSpecifier.substring(0, parts.topLevelNodeModulesIndex)))
-                return undefined;
-            return ts.getPackageNameFromAtTypesDirectory(moduleSpecifier.substring(parts.topLevelPackageNameIndex + 1));
-            function getDirectoryOrExtensionlessFileName(path) {
-                var packageRootPath = path.substring(0, parts.packageRootIndex);
-                var packageJsonPath = ts.combinePaths(packageRootPath, "package.json");
-                if (host.fileExists(packageJsonPath)) {
-                    var packageJsonContent = JSON.parse(host.readFile(packageJsonPath));
-                    if (packageJsonContent) {
-                        var mainFileRelative = packageJsonContent.typings || packageJsonContent.types || packageJsonContent.main;
-                        if (mainFileRelative) {
-                            var mainExportFile = ts.toPath(mainFileRelative, packageRootPath, getCanonicalFileName);
-                            if (mainExportFile === getCanonicalFileName(path)) {
-                                return packageRootPath;
-                            }
-                        }
-                    }
-                }
-                var fullModulePathWithoutExtension = ts.removeFileExtension(path);
-                if (getCanonicalFileName(fullModulePathWithoutExtension.substring(parts.fileNameIndex)) === "/index") {
-                    return fullModulePathWithoutExtension.substring(0, parts.fileNameIndex);
-                }
-                return fullModulePathWithoutExtension;
-            }
-        }
-        function getNodeModulePathParts(fullPath) {
-            var topLevelNodeModulesIndex = 0;
-            var topLevelPackageNameIndex = 0;
-            var packageRootIndex = 0;
-            var fileNameIndex = 0;
-            var States;
-            (function (States) {
-                States[States["BeforeNodeModules"] = 0] = "BeforeNodeModules";
-                States[States["NodeModules"] = 1] = "NodeModules";
-                States[States["Scope"] = 2] = "Scope";
-                States[States["PackageContent"] = 3] = "PackageContent";
-            })(States || (States = {}));
-            var partStart = 0;
-            var partEnd = 0;
-            var state = 0;
-            while (partEnd >= 0) {
-                partStart = partEnd;
-                partEnd = fullPath.indexOf("/", partStart + 1);
-                switch (state) {
-                    case 0:
-                        if (fullPath.indexOf("/node_modules/", partStart) === partStart) {
-                            topLevelNodeModulesIndex = partStart;
-                            topLevelPackageNameIndex = partEnd;
-                            state = 1;
-                        }
-                        break;
-                    case 1:
-                    case 2:
-                        if (state === 1 && fullPath.charAt(partStart + 1) === "@") {
-                            state = 2;
-                        }
-                        else {
-                            packageRootIndex = partEnd;
-                            state = 3;
-                        }
-                        break;
-                    case 3:
-                        if (fullPath.indexOf("/node_modules/", partStart) === partStart) {
-                            state = 1;
-                        }
-                        else {
-                            state = 3;
-                        }
-                        break;
-                }
-            }
-            fileNameIndex = partStart;
-            return state > 1 ? { topLevelNodeModulesIndex: topLevelNodeModulesIndex, topLevelPackageNameIndex: topLevelPackageNameIndex, packageRootIndex: packageRootIndex, fileNameIndex: fileNameIndex } : undefined;
-        }
-        function getPathRelativeToRootDirs(path, rootDirs, getCanonicalFileName) {
-            return ts.firstDefined(rootDirs, function (rootDir) {
-                var relativePath = getRelativePathIfInDirectory(path, rootDir, getCanonicalFileName);
-                return isPathRelativeToParent(relativePath) ? undefined : relativePath;
-            });
-        }
-        function removeExtensionAndIndexPostFix(fileName, moduleResolutionKind, addJsExtension) {
-            var noExtension = ts.removeFileExtension(fileName);
-            return addJsExtension
-                ? noExtension + ".js"
-                : moduleResolutionKind === ts.ModuleResolutionKind.NodeJs
-                    ? ts.removeSuffix(noExtension, "/index")
-                    : noExtension;
-        }
-        function getRelativePathIfInDirectory(path, directoryPath, getCanonicalFileName) {
-            var relativePath = ts.getRelativePathToDirectoryOrUrl(directoryPath, path, directoryPath, getCanonicalFileName, false);
-            return ts.isRootedDiskPath(relativePath) ? undefined : relativePath;
-        }
-        function isPathRelativeToParent(path) {
-            return ts.startsWith(path, "..");
-        }
-    })(moduleSpecifiers = ts.moduleSpecifiers || (ts.moduleSpecifiers = {}));
-})(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var codefix;
@@ -87173,18 +105212,19 @@ var ts;
         function doChange(changes, sourceFile, pos, program) {
             var _a = getInfo(sourceFile, pos), statement = _a.statement, name = _a.name, required = _a.required;
             changes.replaceNode(sourceFile, statement, ts.getAllowSyntheticDefaultImports(program.getCompilerOptions())
-                ? ts.createImportDeclaration(undefined, undefined, ts.createImportClause(name, undefined), required)
-                : ts.createImportEqualsDeclaration(undefined, undefined, name, ts.createExternalModuleReference(required)));
+                ? ts.createImportDeclaration(/*decorators*/ undefined, /*modifiers*/ undefined, ts.createImportClause(name, /*namedBindings*/ undefined), required)
+                : ts.createImportEqualsDeclaration(/*decorators*/ undefined, /*modifiers*/ undefined, name, ts.createExternalModuleReference(required)));
         }
         function getInfo(sourceFile, pos) {
-            var parent = ts.getTokenAtPosition(sourceFile, pos, false).parent;
-            if (!ts.isRequireCall(parent, true))
+            var parent = ts.getTokenAtPosition(sourceFile, pos, /*includeJsDocComment*/ false).parent;
+            if (!ts.isRequireCall(parent, /*checkArgumentIsStringLiteralLike*/ true))
                 throw ts.Debug.failBadSyntaxKind(parent);
             var decl = ts.cast(parent.parent, ts.isVariableDeclaration);
             return { statement: ts.cast(decl.parent.parent, ts.isVariableStatement), name: ts.cast(decl.name, ts.isIdentifier), required: parent.arguments[0] };
         }
     })(codefix = ts.codefix || (ts.codefix = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var codefix;
@@ -87209,9 +105249,9 @@ var ts;
             }); },
         });
         function getInfo(sourceFile, pos) {
-            var name = ts.getTokenAtPosition(sourceFile, pos, false);
+            var name = ts.getTokenAtPosition(sourceFile, pos, /*includeJsDocComment*/ false);
             if (!ts.isIdentifier(name))
-                return undefined;
+                return undefined; // bad input
             var parent = name.parent;
             if (ts.isImportEqualsDeclaration(parent) && ts.isExternalModuleReference(parent.moduleReference)) {
                 return { importNode: parent, name: name, moduleSpecifier: parent.moduleReference.expression };
@@ -87222,10 +105262,11 @@ var ts;
             }
         }
         function doChange(changes, sourceFile, info, preferences) {
-            changes.replaceNode(sourceFile, info.importNode, ts.makeImport(info.name, undefined, info.moduleSpecifier, preferences));
+            changes.replaceNode(sourceFile, info.importNode, ts.makeImport(info.name, /*namedImports*/ undefined, info.moduleSpecifier, ts.getQuotePreference(sourceFile, preferences)));
         }
     })(codefix = ts.codefix || (ts.codefix = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var codefix;
@@ -87247,17 +105288,18 @@ var ts;
             }); },
         });
         function getImportTypeNode(sourceFile, pos) {
-            var token = ts.getTokenAtPosition(sourceFile, pos, false);
-            ts.Debug.assert(token.kind === 91);
-            ts.Debug.assert(token.parent.kind === 179);
+            var token = ts.getTokenAtPosition(sourceFile, pos, /*includeJsDocComment*/ false);
+            ts.Debug.assert(token.kind === 91 /* ImportKeyword */);
+            ts.Debug.assert(token.parent.kind === 179 /* ImportType */);
             return token.parent;
         }
         function doChange(changes, sourceFile, importType) {
-            var newTypeNode = ts.updateImportTypeNode(importType, importType.argument, importType.qualifier, importType.typeArguments, true);
+            var newTypeNode = ts.updateImportTypeNode(importType, importType.argument, importType.qualifier, importType.typeArguments, /* isTypeOf */ true);
             changes.replaceNode(sourceFile, importType, newTypeNode);
         }
     })(codefix = ts.codefix || (ts.codefix = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var codefix;
@@ -87284,7 +105326,7 @@ var ts;
             }); }
         });
         function getInfo(sourceFile, pos) {
-            var token = ts.getTokenAtPosition(sourceFile, pos, false);
+            var token = ts.getTokenAtPosition(sourceFile, pos, /*includeJsDocComment*/ false);
             var indexSignature = ts.cast(token.parent.parent, ts.isIndexSignatureDeclaration);
             if (ts.isClassDeclaration(indexSignature.parent))
                 return undefined;
@@ -87300,7 +105342,7 @@ var ts;
             var otherMembers = members.filter(function (member) { return !ts.isIndexSignatureDeclaration(member); });
             var parameter = ts.first(indexSignature.parameters);
             var mappedTypeParameter = ts.createTypeParameterDeclaration(ts.cast(parameter.name, ts.isIdentifier), parameter.type);
-            var mappedIntersectionType = ts.createMappedTypeNode(ts.hasReadonlyModifier(indexSignature) ? ts.createModifier(132) : undefined, mappedTypeParameter, indexSignature.questionToken, indexSignature.type);
+            var mappedIntersectionType = ts.createMappedTypeNode(ts.hasReadonlyModifier(indexSignature) ? ts.createModifier(132 /* ReadonlyKeyword */) : undefined, mappedTypeParameter, indexSignature.questionToken, indexSignature.type);
             var intersectionType = ts.createIntersectionTypeNode(ts.getAllSuperTypeNodes(container).concat([
                 mappedIntersectionType
             ], (otherMembers.length ? [ts.createTypeLiteralNode(otherMembers)] : ts.emptyArray)));
@@ -87308,6 +105350,7 @@ var ts;
         }
     })(codefix = ts.codefix || (ts.codefix = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var refactor;
@@ -87322,8 +105365,8 @@ var ts;
                     var i = getImportToConvert(context);
                     if (!i)
                         return undefined;
-                    var description = i.kind === 246 ? ts.Diagnostics.Convert_namespace_import_to_named_imports.message : ts.Diagnostics.Convert_named_imports_to_namespace_import.message;
-                    var actionName = i.kind === 246 ? actionNameNamespaceToNamed : actionNameNamedToNamespace;
+                    var description = i.kind === 246 /* NamespaceImport */ ? ts.Diagnostics.Convert_namespace_import_to_named_imports.message : ts.Diagnostics.Convert_named_imports_to_namespace_import.message;
+                    var actionName = i.kind === 246 /* NamespaceImport */ ? actionNameNamespaceToNamed : actionNameNamedToNamespace;
                     return [{ name: refactorName, description: description, actions: [{ name: actionName, description: description }] }];
                 },
                 getEditsForAction: function (context, actionName) {
@@ -87332,10 +105375,11 @@ var ts;
                     return { edits: edits, renameFilename: undefined, renameLocation: undefined };
                 }
             });
+            // Can convert imports of the form `import * as m from "m";` or `import d, { x, y } from "m";`.
             function getImportToConvert(context) {
                 var file = context.file;
                 var span = ts.getRefactorContextSpan(context);
-                var token = ts.getTokenAtPosition(file, span.start, false);
+                var token = ts.getTokenAtPosition(file, span.start, /*includeJsDocComment*/ false);
                 var importDecl = ts.getParentNodeInSpan(token, file, span);
                 if (!importDecl || !ts.isImportDeclaration(importDecl))
                     return undefined;
@@ -87344,7 +105388,7 @@ var ts;
             }
             function doChange(sourceFile, program, changes, toConvert) {
                 var checker = program.getTypeChecker();
-                if (toConvert.kind === 246) {
+                if (toConvert.kind === 246 /* NamespaceImport */) {
                     doChangeNamespaceToNamed(sourceFile, checker, changes, toConvert, ts.getAllowSyntheticDefaultImports(program.getCompilerOptions()));
                 }
                 else {
@@ -87362,13 +105406,14 @@ var ts;
                     else {
                         var parent = ts.cast(id.parent, ts.isPropertyAccessExpression);
                         var exportName = parent.name.text;
-                        if (checker.resolveName(exportName, id, 67108863, true)) {
+                        if (checker.resolveName(exportName, id, 67108863 /* All */, /*excludeGlobals*/ true)) {
                             conflictingNames.set(exportName, true);
                         }
                         ts.Debug.assert(parent.expression === id);
                         nodesToReplace.push(parent);
                     }
                 });
+                // We may need to change `mod.x` to `_x` to avoid a name conflict.
                 var exportNameToImportName = ts.createMap();
                 for (var _i = 0, nodesToReplace_1 = nodesToReplace; _i < nodesToReplace_1.length; _i++) {
                     var propertyAccess = nodesToReplace_1[_i];
@@ -87385,7 +105430,8 @@ var ts;
                 });
                 var importDecl = toConvert.parent.parent;
                 if (usedAsNamespaceOrDefault && !allowSyntheticDefaultImports) {
-                    changes.insertNodeAfter(sourceFile, importDecl, updateImport(importDecl, undefined, importSpecifiers));
+                    // Need to leave the namespace import alone
+                    changes.insertNodeAfter(sourceFile, importDecl, updateImport(importDecl, /*defaultImportName*/ undefined, importSpecifiers));
                 }
                 else {
                     changes.replaceNode(sourceFile, importDecl, updateImport(importDecl, usedAsNamespaceOrDefault ? ts.createIdentifier(toConvert.name.text) : undefined, importSpecifiers));
@@ -87394,15 +105440,15 @@ var ts;
             function doChangeNamedToNamespace(sourceFile, checker, changes, toConvert) {
                 var importDecl = toConvert.parent.parent;
                 var moduleSpecifier = importDecl.moduleSpecifier;
-                var preferredName = moduleSpecifier && ts.isStringLiteral(moduleSpecifier) ? ts.codefix.moduleSpecifierToValidIdentifier(moduleSpecifier.text, 6) : "module";
+                var preferredName = moduleSpecifier && ts.isStringLiteral(moduleSpecifier) ? ts.codefix.moduleSpecifierToValidIdentifier(moduleSpecifier.text, 6 /* ESNext */) : "module";
                 var namespaceNameConflicts = toConvert.elements.some(function (element) {
                     return ts.FindAllReferences.Core.eachSymbolReferenceInFile(element.name, checker, sourceFile, function (id) {
-                        return !!checker.resolveName(preferredName, id, 67108863, true);
+                        return !!checker.resolveName(preferredName, id, 67108863 /* All */, /*excludeGlobals*/ true);
                     }) || false;
                 });
                 var namespaceImportName = namespaceNameConflicts ? ts.getUniqueName(preferredName, sourceFile) : preferredName;
                 var neededNamedImports = [];
-                var _loop_22 = function (element) {
+                var _loop_11 = function (element) {
                     var propertyName = (element.propertyName || element.name).text;
                     ts.FindAllReferences.Core.eachSymbolReferenceInFile(element.name, checker, sourceFile, function (id) {
                         var access = ts.createPropertyAccess(ts.createIdentifier(namespaceImportName), propertyName);
@@ -87421,19 +105467,20 @@ var ts;
                 };
                 for (var _i = 0, _a = toConvert.elements; _i < _a.length; _i++) {
                     var element = _a[_i];
-                    _loop_22(element);
+                    _loop_11(element);
                 }
                 changes.replaceNode(sourceFile, toConvert, ts.createNamespaceImport(ts.createIdentifier(namespaceImportName)));
                 if (neededNamedImports.length) {
-                    changes.insertNodeAfter(sourceFile, toConvert.parent.parent, updateImport(importDecl, undefined, neededNamedImports));
+                    changes.insertNodeAfter(sourceFile, toConvert.parent.parent, updateImport(importDecl, /*defaultImportName*/ undefined, neededNamedImports));
                 }
             }
             function updateImport(old, defaultImportName, elements) {
-                return ts.createImportDeclaration(undefined, undefined, ts.createImportClause(defaultImportName, elements && elements.length ? ts.createNamedImports(elements) : undefined), old.moduleSpecifier);
+                return ts.createImportDeclaration(/*decorators*/ undefined, /*modifiers*/ undefined, ts.createImportClause(defaultImportName, elements && elements.length ? ts.createNamedImports(elements) : undefined), old.moduleSpecifier);
             }
         })(generateGetAccessorAndSetAccessor = refactor.generateGetAccessorAndSetAccessor || (refactor.generateGetAccessorAndSetAccessor = {}));
     })(refactor = ts.refactor || (ts.refactor = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var refactor;
@@ -87442,6 +105489,10 @@ var ts;
         (function (extractSymbol) {
             var refactorName = "Extract Symbol";
             refactor.registerRefactor(refactorName, { getAvailableActions: getAvailableActions, getEditsForAction: getEditsForAction });
+            /**
+             * Compute the associated code actions
+             * Exported for tests.
+             */
             function getAvailableActions(context) {
                 var rangeToExtract = getRangeToExtract(context.file, ts.getRefactorContextSpan(context));
                 var targetRange = rangeToExtract.targetRange;
@@ -87450,6 +105501,7 @@ var ts;
                 }
                 var extractions = getPossibleExtractions(targetRange, context);
                 if (extractions === undefined) {
+                    // No extractions possible
                     return undefined;
                 }
                 var functionActions = [];
@@ -87459,7 +105511,11 @@ var ts;
                 var i = 0;
                 for (var _i = 0, extractions_1 = extractions; _i < extractions_1.length; _i++) {
                     var _a = extractions_1[_i], functionExtraction = _a.functionExtraction, constantExtraction = _a.constantExtraction;
+                    // Skip these since we don't have a way to report errors yet
                     if (functionExtraction.errors.length === 0) {
+                        // Don't issue refactorings with duplicated names.
+                        // Scopes come back in "innermost first" order, so extractions will
+                        // preferentially go into nearer scopes
                         var description = functionExtraction.description;
                         if (!usedFunctionNames.has(description)) {
                             usedFunctionNames.set(description, true);
@@ -87469,7 +105525,11 @@ var ts;
                             });
                         }
                     }
+                    // Skip these since we don't have a way to report errors yet
                     if (constantExtraction.errors.length === 0) {
+                        // Don't issue refactorings with duplicated names.
+                        // Scopes come back in "innermost first" order, so extractions will
+                        // preferentially go into nearer scopes
                         var description = constantExtraction.description;
                         if (!usedConstantNames.has(description)) {
                             usedConstantNames.set(description, true);
@@ -87479,6 +105539,8 @@ var ts;
                             });
                         }
                     }
+                    // *do* increment i anyway because we'll look for the i-th scope
+                    // later when actually doing the refactoring if the user requests it
                     i++;
                 }
                 var infos = [];
@@ -87499,9 +105561,10 @@ var ts;
                 return infos.length ? infos : undefined;
             }
             extractSymbol.getAvailableActions = getAvailableActions;
+            /* Exported for tests */
             function getEditsForAction(context, actionName) {
                 var rangeToExtract = getRangeToExtract(context.file, ts.getRefactorContextSpan(context));
-                var targetRange = rangeToExtract.targetRange;
+                var targetRange = rangeToExtract.targetRange; // TODO:GH#18217
                 var parsedFunctionIndexMatch = /^function_scope_(\d+)$/.exec(actionName);
                 if (parsedFunctionIndexMatch) {
                     var index = +parsedFunctionIndexMatch[1];
@@ -87517,6 +105580,7 @@ var ts;
                 ts.Debug.fail("Unrecognized action name");
             }
             extractSymbol.getEditsForAction = getEditsForAction;
+            // Move these into diagnostic messages if they become user-facing
             var Messages;
             (function (Messages) {
                 function createMessage(message) {
@@ -87552,29 +105616,47 @@ var ts;
                 RangeFacts[RangeFacts["IsGenerator"] = 2] = "IsGenerator";
                 RangeFacts[RangeFacts["IsAsyncFunction"] = 4] = "IsAsyncFunction";
                 RangeFacts[RangeFacts["UsesThis"] = 8] = "UsesThis";
+                /**
+                 * The range is in a function which needs the 'static' modifier in a class
+                 */
                 RangeFacts[RangeFacts["InStaticRegion"] = 16] = "InStaticRegion";
             })(RangeFacts || (RangeFacts = {}));
+            /**
+             * getRangeToExtract takes a span inside a text file and returns either an expression or an array
+             * of statements representing the minimum set of nodes needed to extract the entire span. This
+             * process may fail, in which case a set of errors is returned instead (these are currently
+             * not shown to the user, but can be used by us diagnostically)
+             */
+            // exported only for tests
             function getRangeToExtract(sourceFile, span) {
                 var length = span.length;
                 if (length === 0) {
                     return { errors: [ts.createFileDiagnostic(sourceFile, span.start, length, Messages.cannotExtractEmpty)] };
                 }
-                var start = ts.getParentNodeInSpan(ts.getTokenAtPosition(sourceFile, span.start, false), sourceFile, span);
+                // Walk up starting from the the start position until we find a non-SourceFile node that subsumes the selected span.
+                // This may fail (e.g. you select two statements in the root of a source file)
+                var start = ts.getParentNodeInSpan(ts.getTokenAtPosition(sourceFile, span.start, /*includeJsDocComment*/ false), sourceFile, span);
+                // Do the same for the ending position
                 var end = ts.getParentNodeInSpan(ts.findTokenOnLeftOfPosition(sourceFile, ts.textSpanEnd(span)), sourceFile, span);
                 var declarations = [];
+                // We'll modify these flags as we walk the tree to collect data
+                // about what things need to be done as part of the extraction.
                 var rangeFacts = RangeFacts.None;
                 if (!start || !end) {
+                    // cannot find either start or end node
                     return { errors: [ts.createFileDiagnostic(sourceFile, span.start, length, Messages.cannotExtractRange)] };
                 }
                 if (start.parent !== end.parent) {
+                    // start and end nodes belong to different subtrees
                     return { errors: [ts.createFileDiagnostic(sourceFile, span.start, length, Messages.cannotExtractRange)] };
                 }
                 if (start !== end) {
+                    // start and end should be statements and parent should be either block or a source file
                     if (!isBlockLike(start.parent)) {
                         return { errors: [ts.createFileDiagnostic(sourceFile, span.start, length, Messages.cannotExtractRange)] };
                     }
                     var statements = [];
-                    var start2 = start;
+                    var start2 = start; // TODO: GH#18217 Need to alias `start` to get this to compile. See https://github.com/Microsoft/TypeScript/issues/19955#issuecomment-344118248
                     for (var _i = 0, _a = start2.parent.statements; _i < _a.length; _i++) {
                         var statement = _a[_i];
                         if (statement === start || statements.length) {
@@ -87589,19 +105671,30 @@ var ts;
                         }
                     }
                     if (!statements.length) {
+                        // https://github.com/Microsoft/TypeScript/issues/20559
+                        // Ranges like [|case 1: break;|] will fail to populate `statements` because
+                        // they will never find `start` in `start.parent.statements`.
+                        // Consider: We could support ranges like [|case 1:|] by refining them to just
+                        // the expression.
                         return { errors: [ts.createFileDiagnostic(sourceFile, span.start, length, Messages.cannotExtractRange)] };
                     }
                     return { targetRange: { range: statements, facts: rangeFacts, declarations: declarations } };
                 }
                 if (ts.isReturnStatement(start) && !start.expression) {
+                    // Makes no sense to extract an expression-less return statement.
                     return { errors: [ts.createFileDiagnostic(sourceFile, span.start, length, Messages.cannotExtractRange)] };
                 }
+                // We have a single node (start)
                 var node = refineNode(start);
                 var errors = checkRootNode(node) || checkNode(node);
                 if (errors) {
                     return { errors: errors };
                 }
-                return { targetRange: { range: getStatementOrExpressionRange(node), facts: rangeFacts, declarations: declarations } };
+                return { targetRange: { range: getStatementOrExpressionRange(node), facts: rangeFacts, declarations: declarations } }; // TODO: GH#18217
+                /**
+                 * Attempt to refine the extraction node (generally, by shrinking it) to produce better results.
+                 * @param node The unrefined extraction node.
+                 */
                 function refineNode(node) {
                     if (ts.isReturnStatement(node)) {
                         if (node.expression) {
@@ -87621,6 +105714,7 @@ var ts;
                         if (numInitializers === 1) {
                             return lastInitializer;
                         }
+                        // No special handling if there are multiple initializers.
                     }
                     else if (ts.isVariableDeclaration(node)) {
                         if (node.initializer) {
@@ -87638,27 +105732,28 @@ var ts;
                 function checkForStaticContext(nodeToCheck, containingClass) {
                     var current = nodeToCheck;
                     while (current !== containingClass) {
-                        if (current.kind === 152) {
-                            if (ts.hasModifier(current, 32)) {
+                        if (current.kind === 152 /* PropertyDeclaration */) {
+                            if (ts.hasModifier(current, 32 /* Static */)) {
                                 rangeFacts |= RangeFacts.InStaticRegion;
                             }
                             break;
                         }
-                        else if (current.kind === 149) {
+                        else if (current.kind === 149 /* Parameter */) {
                             var ctorOrMethod = ts.getContainingFunction(current);
-                            if (ctorOrMethod.kind === 155) {
+                            if (ctorOrMethod.kind === 155 /* Constructor */) {
                                 rangeFacts |= RangeFacts.InStaticRegion;
                             }
                             break;
                         }
-                        else if (current.kind === 154) {
-                            if (ts.hasModifier(current, 32)) {
+                        else if (current.kind === 154 /* MethodDeclaration */) {
+                            if (ts.hasModifier(current, 32 /* Static */)) {
                                 rangeFacts |= RangeFacts.InStaticRegion;
                             }
                         }
                         current = current.parent;
                     }
                 }
+                // Verifies whether we can actually extract this node or not.
                 function checkNode(nodeToCheck) {
                     var PermittedJumps;
                     (function (PermittedJumps) {
@@ -87667,42 +105762,53 @@ var ts;
                         PermittedJumps[PermittedJumps["Continue"] = 2] = "Continue";
                         PermittedJumps[PermittedJumps["Return"] = 4] = "Return";
                     })(PermittedJumps || (PermittedJumps = {}));
+                    // We believe it's true because the node is from the (unmodified) tree.
                     ts.Debug.assert(nodeToCheck.pos <= nodeToCheck.end, "This failure could trigger https://github.com/Microsoft/TypeScript/issues/20809");
+                    // For understanding how skipTrivia functioned:
                     ts.Debug.assert(!ts.positionIsSynthesized(nodeToCheck.pos), "This failure could trigger https://github.com/Microsoft/TypeScript/issues/20809");
                     if (!ts.isStatement(nodeToCheck) && !(ts.isExpressionNode(nodeToCheck) && isExtractableExpression(nodeToCheck))) {
                         return [ts.createDiagnosticForNode(nodeToCheck, Messages.statementOrExpressionExpected)];
                     }
-                    if (nodeToCheck.flags & 4194304) {
+                    if (nodeToCheck.flags & 4194304 /* Ambient */) {
                         return [ts.createDiagnosticForNode(nodeToCheck, Messages.cannotExtractAmbientBlock)];
                     }
+                    // If we're in a class, see whether we're in a static region (static property initializer, static method, class constructor parameter default)
                     var containingClass = ts.getContainingClass(nodeToCheck);
                     if (containingClass) {
                         checkForStaticContext(nodeToCheck, containingClass);
                     }
                     var errors;
-                    var permittedJumps = 4;
+                    var permittedJumps = 4 /* Return */;
                     var seenLabels;
                     visit(nodeToCheck);
                     return errors;
                     function visit(node) {
                         if (errors) {
+                            // already found an error - can stop now
                             return true;
                         }
                         if (ts.isDeclaration(node)) {
-                            var declaringNode = (node.kind === 232) ? node.parent.parent : node;
-                            if (ts.hasModifier(declaringNode, 1)) {
+                            var declaringNode = (node.kind === 232 /* VariableDeclaration */) ? node.parent.parent : node;
+                            if (ts.hasModifier(declaringNode, 1 /* Export */)) {
+                                // TODO: GH#18217 Silly to use `errors ||` since it's definitely not defined (see top of `visit`)
+                                // Also, if we're only pushing one error, just use `let error: Diagnostic | undefined`!
+                                // Also TODO: GH#19956
                                 (errors || (errors = [])).push(ts.createDiagnosticForNode(node, Messages.cannotExtractExportedEntity));
                                 return true;
                             }
                             declarations.push(node.symbol);
                         }
+                        // Some things can't be extracted in certain situations
                         switch (node.kind) {
-                            case 244:
+                            case 244 /* ImportDeclaration */:
                                 (errors || (errors = [])).push(ts.createDiagnosticForNode(node, Messages.cannotExtractImport));
                                 return true;
-                            case 97:
-                                if (node.parent.kind === 187) {
-                                    var containingClass_1 = ts.getContainingClass(node);
+                            case 97 /* SuperKeyword */:
+                                // For a super *constructor call*, we have to be extracting the entire class,
+                                // but a super *method call* simply implies a 'this' reference
+                                if (node.parent.kind === 187 /* CallExpression */) {
+                                    // Super constructor call
+                                    var containingClass_1 = ts.getContainingClass(node); // TODO:GH#18217
                                     if (containingClass_1.pos < span.start || containingClass_1.end >= (span.start + span.length)) {
                                         (errors || (errors = [])).push(ts.createDiagnosticForNode(node, Messages.cannotExtractSuper));
                                         return true;
@@ -87715,43 +105821,49 @@ var ts;
                         }
                         if (ts.isFunctionLikeDeclaration(node) || ts.isClassLike(node)) {
                             switch (node.kind) {
-                                case 234:
-                                case 235:
+                                case 234 /* FunctionDeclaration */:
+                                case 235 /* ClassDeclaration */:
                                     if (ts.isSourceFile(node.parent) && node.parent.externalModuleIndicator === undefined) {
+                                        // You cannot extract global declarations
                                         (errors || (errors = [])).push(ts.createDiagnosticForNode(node, Messages.functionWillNotBeVisibleInTheNewScope));
                                     }
                                     break;
                             }
+                            // do not dive into functions or classes
                             return false;
                         }
                         var savedPermittedJumps = permittedJumps;
                         switch (node.kind) {
-                            case 217:
-                                permittedJumps = 0;
+                            case 217 /* IfStatement */:
+                                permittedJumps = 0 /* None */;
                                 break;
-                            case 230:
-                                permittedJumps = 0;
+                            case 230 /* TryStatement */:
+                                // forbid all jumps inside try blocks
+                                permittedJumps = 0 /* None */;
                                 break;
-                            case 213:
-                                if (node.parent && node.parent.kind === 230 && node.parent.finallyBlock === node) {
-                                    permittedJumps = 4;
+                            case 213 /* Block */:
+                                if (node.parent && node.parent.kind === 230 /* TryStatement */ && node.parent.finallyBlock === node) {
+                                    // allow unconditional returns from finally blocks
+                                    permittedJumps = 4 /* Return */;
                                 }
                                 break;
-                            case 266:
-                                permittedJumps |= 1;
+                            case 266 /* CaseClause */:
+                                // allow unlabeled break inside case clauses
+                                permittedJumps |= 1 /* Break */;
                                 break;
                             default:
-                                if (ts.isIterationStatement(node, false)) {
-                                    permittedJumps |= 1 | 2;
+                                if (ts.isIterationStatement(node, /*lookInLabeledStatements*/ false)) {
+                                    // allow unlabeled break/continue inside loops
+                                    permittedJumps |= 1 /* Break */ | 2 /* Continue */;
                                 }
                                 break;
                         }
                         switch (node.kind) {
-                            case 174:
-                            case 99:
+                            case 174 /* ThisType */:
+                            case 99 /* ThisKeyword */:
                                 rangeFacts |= RangeFacts.UsesThis;
                                 break;
-                            case 228:
+                            case 228 /* LabeledStatement */:
                                 {
                                     var label = node.label;
                                     (seenLabels || (seenLabels = [])).push(label.escapedText);
@@ -87759,30 +105871,32 @@ var ts;
                                     seenLabels.pop();
                                     break;
                                 }
-                            case 224:
-                            case 223:
+                            case 224 /* BreakStatement */:
+                            case 223 /* ContinueStatement */:
                                 {
                                     var label = node.label;
                                     if (label) {
                                         if (!ts.contains(seenLabels, label.escapedText)) {
+                                            // attempts to jump to label that is not in range to be extracted
                                             (errors || (errors = [])).push(ts.createDiagnosticForNode(node, Messages.cannotExtractRangeContainingLabeledBreakOrContinueStatementWithTargetOutsideOfTheRange));
                                         }
                                     }
                                     else {
-                                        if (!(permittedJumps & (node.kind === 224 ? 1 : 2))) {
+                                        if (!(permittedJumps & (node.kind === 224 /* BreakStatement */ ? 1 /* Break */ : 2 /* Continue */))) {
+                                            // attempt to break or continue in a forbidden context
                                             (errors || (errors = [])).push(ts.createDiagnosticForNode(node, Messages.cannotExtractRangeContainingConditionalBreakOrContinueStatements));
                                         }
                                     }
                                     break;
                                 }
-                            case 197:
+                            case 197 /* AwaitExpression */:
                                 rangeFacts |= RangeFacts.IsAsyncFunction;
                                 break;
-                            case 203:
+                            case 203 /* YieldExpression */:
                                 rangeFacts |= RangeFacts.IsGenerator;
                                 break;
-                            case 225:
-                                if (permittedJumps & 4) {
+                            case 225 /* ReturnStatement */:
+                                if (permittedJumps & 4 /* Return */) {
                                     rangeFacts |= RangeFacts.HasReturn;
                                 }
                                 else {
@@ -87803,6 +105917,10 @@ var ts;
                     return [node];
                 }
                 else if (ts.isExpressionNode(node)) {
+                    // If our selection is the expression in an ExpressionStatement, expand
+                    // the selection to include the enclosing Statement (this stops us
+                    // from trying to care about the return value of the extracted function
+                    // and eliminates double semicolon insertion in certain scenarios)
                     return ts.isExpressionStatement(node.parent) ? [node.parent] : node;
                 }
                 return undefined;
@@ -87810,9 +105928,15 @@ var ts;
             function isScope(node) {
                 return ts.isFunctionLikeDeclaration(node) || ts.isSourceFile(node) || ts.isModuleBlock(node) || ts.isClassLike(node);
             }
+            /**
+             * Computes possible places we could extract the function into. For example,
+             * you may be able to extract into a class method *or* local closure *or* namespace function,
+             * depending on what's in the extracted body.
+             */
             function collectEnclosingScopes(range) {
                 var current = isReadonlyArray(range.range) ? ts.first(range.range) : range.range;
                 if (range.facts & RangeFacts.UsesThis) {
+                    // if range uses this as keyword or as type inside the class then it can only be extracted to a method of the containing class
                     var containingClass = ts.getContainingClass(current);
                     if (containingClass) {
                         var containingFunction = ts.findAncestor(current, ts.isFunctionLikeDeclaration);
@@ -87824,12 +105948,19 @@ var ts;
                 var scopes = [];
                 while (true) {
                     current = current.parent;
-                    if (current.kind === 149) {
+                    // A function parameter's initializer is actually in the outer scope, not the function declaration
+                    if (current.kind === 149 /* Parameter */) {
+                        // Skip all the way to the outer scope of the function that declared this parameter
                         current = ts.findAncestor(current, function (parent) { return ts.isFunctionLikeDeclaration(parent); }).parent;
                     }
+                    // We want to find the nearest parent where we can place an "equivalent" sibling to the node we're extracting out of.
+                    // Walk up to the closest parent of a place where we can logically put a sibling:
+                    //  * Function declaration
+                    //  * Class declaration or expression
+                    //  * Module/namespace or source file
                     if (isScope(current)) {
                         scopes.push(current);
-                        if (current.kind === 274) {
+                        if (current.kind === 274 /* SourceFile */) {
                             return scopes;
                         }
                     }
@@ -87838,7 +105969,7 @@ var ts;
             function getFunctionExtractionAtIndex(targetRange, context, requestedChangesIndex) {
                 var _a = getPossibleExtractionsWorker(targetRange, context), scopes = _a.scopes, _b = _a.readsAndWrites, target = _b.target, usagesPerScope = _b.usagesPerScope, functionErrorsPerScope = _b.functionErrorsPerScope, exposedVariableDeclarations = _b.exposedVariableDeclarations;
                 ts.Debug.assert(!functionErrorsPerScope[requestedChangesIndex].length, "The extraction went missing? How?");
-                context.cancellationToken.throwIfCancellationRequested();
+                context.cancellationToken.throwIfCancellationRequested(); // TODO: GH#18217
                 return extractFunctionInScope(target, scopes[requestedChangesIndex], usagesPerScope[requestedChangesIndex], exposedVariableDeclarations, targetRange, context);
             }
             function getConstantExtractionAtIndex(targetRange, context, requestedChangesIndex) {
@@ -87851,8 +105982,14 @@ var ts;
                     : target.statements[0].expression;
                 return extractConstantInScope(expression, scopes[requestedChangesIndex], usagesPerScope[requestedChangesIndex], targetRange.facts, context);
             }
+            /**
+             * Given a piece of text to extract ('targetRange'), computes a list of possible extractions.
+             * Each returned ExtractResultForScope corresponds to a possible target scope and is either a set of changes
+             * or an error explaining why we can't extract into that scope.
+             */
             function getPossibleExtractions(targetRange, context) {
                 var _a = getPossibleExtractionsWorker(targetRange, context), scopes = _a.scopes, _b = _a.readsAndWrites, functionErrorsPerScope = _b.functionErrorsPerScope, constantErrorsPerScope = _b.constantErrorsPerScope;
+                // Need the inner type annotation to avoid https://github.com/Microsoft/TypeScript/issues/7547
                 var extractions = scopes.map(function (scope, i) {
                     var functionDescriptionPart = getDescriptionForFunctionInScope(scope);
                     var constantDescriptionPart = getDescriptionForConstantInScope(scope);
@@ -87863,11 +106000,11 @@ var ts;
                             : getDescriptionForModuleLikeDeclaration(scope);
                     var functionDescription;
                     var constantDescription;
-                    if (scopeDescription === 1) {
+                    if (scopeDescription === 1 /* Global */) {
                         functionDescription = ts.formatStringFromArgs(ts.getLocaleSpecificMessage(ts.Diagnostics.Extract_to_0_in_1_scope), [functionDescriptionPart, "global"]);
                         constantDescription = ts.formatStringFromArgs(ts.getLocaleSpecificMessage(ts.Diagnostics.Extract_to_0_in_1_scope), [constantDescriptionPart, "global"]);
                     }
-                    else if (scopeDescription === 0) {
+                    else if (scopeDescription === 0 /* Module */) {
                         functionDescription = ts.formatStringFromArgs(ts.getLocaleSpecificMessage(ts.Diagnostics.Extract_to_0_in_1_scope), [functionDescriptionPart, "module"]);
                         constantDescription = ts.formatStringFromArgs(ts.getLocaleSpecificMessage(ts.Diagnostics.Extract_to_0_in_1_scope), [constantDescriptionPart, "module"]);
                     }
@@ -87875,6 +106012,7 @@ var ts;
                         functionDescription = ts.formatStringFromArgs(ts.getLocaleSpecificMessage(ts.Diagnostics.Extract_to_0_in_1), [functionDescriptionPart, scopeDescription]);
                         constantDescription = ts.formatStringFromArgs(ts.getLocaleSpecificMessage(ts.Diagnostics.Extract_to_0_in_1), [constantDescriptionPart, scopeDescription]);
                     }
+                    // Customize the phrasing for the innermost scope to increase clarity.
                     if (i === 0 && !ts.isClassLike(scope)) {
                         constantDescription = ts.formatStringFromArgs(ts.getLocaleSpecificMessage(ts.Diagnostics.Extract_to_0_in_enclosing_scope), [constantDescriptionPart]);
                     }
@@ -87912,43 +106050,48 @@ var ts;
             }
             function getDescriptionForFunctionLikeDeclaration(scope) {
                 switch (scope.kind) {
-                    case 155:
+                    case 155 /* Constructor */:
                         return "constructor";
-                    case 192:
-                    case 234:
+                    case 192 /* FunctionExpression */:
+                    case 234 /* FunctionDeclaration */:
                         return scope.name
                             ? "function '" + scope.name.text + "'"
                             : "anonymous function";
-                    case 193:
+                    case 193 /* ArrowFunction */:
                         return "arrow function";
-                    case 154:
+                    case 154 /* MethodDeclaration */:
                         return "method '" + scope.name.getText();
-                    case 156:
+                    case 156 /* GetAccessor */:
                         return "'get " + scope.name.getText() + "'";
-                    case 157:
+                    case 157 /* SetAccessor */:
                         return "'set " + scope.name.getText() + "'";
                     default:
                         throw ts.Debug.assertNever(scope);
                 }
             }
             function getDescriptionForClassLikeDeclaration(scope) {
-                return scope.kind === 235
+                return scope.kind === 235 /* ClassDeclaration */
                     ? scope.name ? "class '" + scope.name.text + "'" : "anonymous class declaration"
                     : scope.name ? "class expression '" + scope.name.text + "'" : "anonymous class expression";
             }
             function getDescriptionForModuleLikeDeclaration(scope) {
-                return scope.kind === 240
+                return scope.kind === 240 /* ModuleBlock */
                     ? "namespace '" + scope.parent.name.getText() + "'"
-                    : scope.externalModuleIndicator ? 0 : 1;
+                    : scope.externalModuleIndicator ? 0 /* Module */ : 1 /* Global */;
             }
             var SpecialScope;
             (function (SpecialScope) {
                 SpecialScope[SpecialScope["Module"] = 0] = "Module";
                 SpecialScope[SpecialScope["Global"] = 1] = "Global";
             })(SpecialScope || (SpecialScope = {}));
+            /**
+             * Result of 'extractRange' operation for a specific scope.
+             * Stores either a list of changes that should be applied to extract a range or a list of errors
+             */
             function extractFunctionInScope(node, scope, _a, exposedVariableDeclarations, range, context) {
                 var usagesInScope = _a.usages, typeParameterUsages = _a.typeParameterUsages, substitutions = _a.substitutions;
                 var checker = context.program.getTypeChecker();
+                // Make a unique name for the extracted function
                 var file = scope.getSourceFile();
                 var functionNameText = ts.getUniqueName(ts.isClassLike(scope) ? "newMethod" : "newFunction", file);
                 var isJS = ts.isInJavaScriptFile(scope);
@@ -87961,12 +106104,18 @@ var ts;
                     var typeNode;
                     if (!isJS) {
                         var type = checker.getTypeOfSymbolAtLocation(usage.symbol, usage.node);
+                        // Widen the type so we don't emit nonsense annotations like "function fn(x: 3) {"
                         type = checker.getBaseTypeOfLiteralType(type);
-                        typeNode = checker.typeToTypeNode(type, scope, 1);
+                        typeNode = checker.typeToTypeNode(type, scope, 1 /* NoTruncation */);
                     }
-                    var paramDecl = ts.createParameter(undefined, undefined, undefined, name, undefined, typeNode);
+                    var paramDecl = ts.createParameter(
+                    /*decorators*/ undefined, 
+                    /*modifiers*/ undefined, 
+                    /*dotDotDotToken*/ undefined, 
+                    /*name*/ name, 
+                    /*questionToken*/ undefined, typeNode);
                     parameters.push(paramDecl);
-                    if (usage.usage === 2) {
+                    if (usage.usage === 2 /* Write */) {
                         (writes || (writes = [])).push(usage);
                     }
                     callArguments.push(ts.createIdentifier(name));
@@ -87976,93 +106125,130 @@ var ts;
                 var typeParameters = sortedTypeParametersAndDeclarations.length === 0
                     ? undefined
                     : sortedTypeParametersAndDeclarations.map(function (t) { return t.declaration; });
+                // Strictly speaking, we should check whether each name actually binds to the appropriate type
+                // parameter.  In cases of shadowing, they may not.
                 var callTypeArguments = typeParameters !== undefined
-                    ? typeParameters.map(function (decl) { return ts.createTypeReferenceNode(decl.name, undefined); })
+                    ? typeParameters.map(function (decl) { return ts.createTypeReferenceNode(decl.name, /*typeArguments*/ undefined); })
                     : undefined;
+                // Provide explicit return types for contextually-typed functions
+                // to avoid problems when there are literal types present
                 if (ts.isExpression(node) && !isJS) {
                     var contextualType = checker.getContextualType(node);
-                    returnType = checker.typeToTypeNode(contextualType, scope, 1);
+                    returnType = checker.typeToTypeNode(contextualType, scope, 1 /* NoTruncation */); // TODO: GH#18217
                 }
                 var _b = transformFunctionBody(node, exposedVariableDeclarations, writes, substitutions, !!(range.facts & RangeFacts.HasReturn)), body = _b.body, returnValueProperty = _b.returnValueProperty;
                 ts.suppressLeadingAndTrailingTrivia(body);
                 var newFunction;
                 if (ts.isClassLike(scope)) {
-                    var modifiers = isJS ? [] : [ts.createToken(112)];
+                    // always create private method in TypeScript files
+                    var modifiers = isJS ? [] : [ts.createToken(112 /* PrivateKeyword */)];
                     if (range.facts & RangeFacts.InStaticRegion) {
-                        modifiers.push(ts.createToken(115));
+                        modifiers.push(ts.createToken(115 /* StaticKeyword */));
                     }
                     if (range.facts & RangeFacts.IsAsyncFunction) {
-                        modifiers.push(ts.createToken(120));
+                        modifiers.push(ts.createToken(120 /* AsyncKeyword */));
                     }
-                    newFunction = ts.createMethod(undefined, modifiers.length ? modifiers : undefined, range.facts & RangeFacts.IsGenerator ? ts.createToken(39) : undefined, functionName, undefined, typeParameters, parameters, returnType, body);
+                    newFunction = ts.createMethod(
+                    /*decorators*/ undefined, modifiers.length ? modifiers : undefined, range.facts & RangeFacts.IsGenerator ? ts.createToken(39 /* AsteriskToken */) : undefined, functionName, 
+                    /*questionToken*/ undefined, typeParameters, parameters, returnType, body);
                 }
                 else {
-                    newFunction = ts.createFunctionDeclaration(undefined, range.facts & RangeFacts.IsAsyncFunction ? [ts.createToken(120)] : undefined, range.facts & RangeFacts.IsGenerator ? ts.createToken(39) : undefined, functionName, typeParameters, parameters, returnType, body);
+                    newFunction = ts.createFunctionDeclaration(
+                    /*decorators*/ undefined, range.facts & RangeFacts.IsAsyncFunction ? [ts.createToken(120 /* AsyncKeyword */)] : undefined, range.facts & RangeFacts.IsGenerator ? ts.createToken(39 /* AsteriskToken */) : undefined, functionName, typeParameters, parameters, returnType, body);
                 }
                 var changeTracker = ts.textChanges.ChangeTracker.fromContext(context);
                 var minInsertionPos = (isReadonlyArray(range.range) ? ts.last(range.range) : range.range).end;
                 var nodeToInsertBefore = getNodeToInsertFunctionBefore(minInsertionPos, scope);
                 if (nodeToInsertBefore) {
-                    changeTracker.insertNodeBefore(context.file, nodeToInsertBefore, newFunction, true);
+                    changeTracker.insertNodeBefore(context.file, nodeToInsertBefore, newFunction, /*blankLineBetween*/ true);
                 }
                 else {
                     changeTracker.insertNodeAtEndOfScope(context.file, scope, newFunction);
                 }
                 var newNodes = [];
+                // replace range with function call
                 var called = getCalledExpression(scope, range, functionNameText);
-                var call = ts.createCall(called, callTypeArguments, callArguments);
+                var call = ts.createCall(called, callTypeArguments, // Note that no attempt is made to take advantage of type argument inference
+                callArguments);
                 if (range.facts & RangeFacts.IsGenerator) {
-                    call = ts.createYield(ts.createToken(39), call);
+                    call = ts.createYield(ts.createToken(39 /* AsteriskToken */), call);
                 }
                 if (range.facts & RangeFacts.IsAsyncFunction) {
                     call = ts.createAwait(call);
                 }
                 if (exposedVariableDeclarations.length && !writes) {
+                    // No need to mix declarations and writes.
+                    // How could any variables be exposed if there's a return statement?
                     ts.Debug.assert(!returnValueProperty);
                     ts.Debug.assert(!(range.facts & RangeFacts.HasReturn));
                     if (exposedVariableDeclarations.length === 1) {
+                        // Declaring exactly one variable: let x = newFunction();
                         var variableDeclaration = exposedVariableDeclarations[0];
-                        newNodes.push(ts.createVariableStatement(undefined, ts.createVariableDeclarationList([ts.createVariableDeclaration(ts.getSynthesizedDeepClone(variableDeclaration.name), ts.getSynthesizedDeepClone(variableDeclaration.type), call)], variableDeclaration.parent.flags)));
+                        newNodes.push(ts.createVariableStatement(
+                        /*modifiers*/ undefined, ts.createVariableDeclarationList([ts.createVariableDeclaration(ts.getSynthesizedDeepClone(variableDeclaration.name), /*type*/ ts.getSynthesizedDeepClone(variableDeclaration.type), /*initializer*/ call)], // TODO (acasey): test binding patterns
+                        variableDeclaration.parent.flags)));
                     }
                     else {
+                        // Declaring multiple variables / return properties:
+                        //   let {x, y} = newFunction();
                         var bindingElements = [];
                         var typeElements = [];
                         var commonNodeFlags = exposedVariableDeclarations[0].parent.flags;
                         var sawExplicitType = false;
                         for (var _i = 0, exposedVariableDeclarations_1 = exposedVariableDeclarations; _i < exposedVariableDeclarations_1.length; _i++) {
                             var variableDeclaration = exposedVariableDeclarations_1[_i];
-                            bindingElements.push(ts.createBindingElement(undefined, undefined, ts.getSynthesizedDeepClone(variableDeclaration.name)));
-                            var variableType = checker.typeToTypeNode(checker.getBaseTypeOfLiteralType(checker.getTypeAtLocation(variableDeclaration)), scope, 1);
-                            typeElements.push(ts.createPropertySignature(undefined, variableDeclaration.symbol.name, undefined, variableType, undefined));
+                            bindingElements.push(ts.createBindingElement(
+                            /*dotDotDotToken*/ undefined, 
+                            /*propertyName*/ undefined, 
+                            /*name*/ ts.getSynthesizedDeepClone(variableDeclaration.name)));
+                            // Being returned through an object literal will have widened the type.
+                            var variableType = checker.typeToTypeNode(checker.getBaseTypeOfLiteralType(checker.getTypeAtLocation(variableDeclaration)), // TODO: GH#18217
+                            scope, 1 /* NoTruncation */);
+                            typeElements.push(ts.createPropertySignature(
+                            /*modifiers*/ undefined, 
+                            /*name*/ variableDeclaration.symbol.name, 
+                            /*questionToken*/ undefined, 
+                            /*type*/ variableType, 
+                            /*initializer*/ undefined));
                             sawExplicitType = sawExplicitType || variableDeclaration.type !== undefined;
                             commonNodeFlags = commonNodeFlags & variableDeclaration.parent.flags;
                         }
                         var typeLiteral = sawExplicitType ? ts.createTypeLiteralNode(typeElements) : undefined;
                         if (typeLiteral) {
-                            ts.setEmitFlags(typeLiteral, 1);
+                            ts.setEmitFlags(typeLiteral, 1 /* SingleLine */);
                         }
-                        newNodes.push(ts.createVariableStatement(undefined, ts.createVariableDeclarationList([ts.createVariableDeclaration(ts.createObjectBindingPattern(bindingElements), typeLiteral, call)], commonNodeFlags)));
+                        newNodes.push(ts.createVariableStatement(
+                        /*modifiers*/ undefined, ts.createVariableDeclarationList([ts.createVariableDeclaration(ts.createObjectBindingPattern(bindingElements), 
+                            /*type*/ typeLiteral, 
+                            /*initializer*/ call)], commonNodeFlags)));
                     }
                 }
                 else if (exposedVariableDeclarations.length || writes) {
                     if (exposedVariableDeclarations.length) {
+                        // CONSIDER: we're going to create one statement per variable, but we could actually preserve their original grouping.
                         for (var _c = 0, exposedVariableDeclarations_2 = exposedVariableDeclarations; _c < exposedVariableDeclarations_2.length; _c++) {
                             var variableDeclaration = exposedVariableDeclarations_2[_c];
                             var flags = variableDeclaration.parent.flags;
-                            if (flags & 2) {
-                                flags = (flags & ~2) | 1;
+                            if (flags & 2 /* Const */) {
+                                flags = (flags & ~2 /* Const */) | 1 /* Let */;
                             }
-                            newNodes.push(ts.createVariableStatement(undefined, ts.createVariableDeclarationList([ts.createVariableDeclaration(variableDeclaration.symbol.name, getTypeDeepCloneUnionUndefined(variableDeclaration.type))], flags)));
+                            newNodes.push(ts.createVariableStatement(
+                            /*modifiers*/ undefined, ts.createVariableDeclarationList([ts.createVariableDeclaration(variableDeclaration.symbol.name, getTypeDeepCloneUnionUndefined(variableDeclaration.type))], flags)));
                         }
                     }
                     if (returnValueProperty) {
-                        newNodes.push(ts.createVariableStatement(undefined, ts.createVariableDeclarationList([ts.createVariableDeclaration(returnValueProperty, getTypeDeepCloneUnionUndefined(returnType))], 1)));
+                        // has both writes and return, need to create variable declaration to hold return value;
+                        newNodes.push(ts.createVariableStatement(
+                        /*modifiers*/ undefined, ts.createVariableDeclarationList([ts.createVariableDeclaration(returnValueProperty, getTypeDeepCloneUnionUndefined(returnType))], 1 /* Let */)));
                     }
                     var assignments = getPropertyAssignmentsForWritesAndVariableDeclarations(exposedVariableDeclarations, writes);
                     if (returnValueProperty) {
                         assignments.unshift(ts.createShorthandPropertyAssignment(returnValueProperty));
                     }
+                    // propagate writes back
                     if (assignments.length === 1) {
+                        // We would only have introduced a return value property if there had been
+                        // other assignments to make.
                         ts.Debug.assert(!returnValueProperty);
                         newNodes.push(ts.createStatement(ts.createAssignment(assignments[0].name, call)));
                         if (range.facts & RangeFacts.HasReturn) {
@@ -88070,6 +106256,9 @@ var ts;
                         }
                     }
                     else {
+                        // emit e.g.
+                        //   { a, b, __return } = newFunction(a, b);
+                        //   return __return;
                         newNodes.push(ts.createStatement(ts.createAssignment(ts.createObjectLiteral(assignments), call)));
                         if (returnValueProperty) {
                             newNodes.push(ts.createReturn(ts.createIdentifier(returnValueProperty)));
@@ -88096,7 +106285,7 @@ var ts;
                 var edits = changeTracker.getChanges();
                 var renameRange = isReadonlyArray(range.range) ? ts.first(range.range) : range.range;
                 var renameFilename = renameRange.getSourceFile().fileName;
-                var renameLocation = ts.getRenameLocation(edits, renameFilename, functionNameText, false);
+                var renameLocation = ts.getRenameLocation(edits, renameFilename, functionNameText, /*isDeclaredBeforeUse*/ false);
                 return { renameFilename: renameFilename, renameLocation: renameLocation, edits: edits };
                 function getTypeDeepCloneUnionUndefined(typeNode) {
                     if (typeNode === undefined) {
@@ -88107,62 +106296,85 @@ var ts;
                     while (ts.isParenthesizedTypeNode(withoutParens)) {
                         withoutParens = withoutParens.type;
                     }
-                    return ts.isUnionTypeNode(withoutParens) && ts.find(withoutParens.types, function (t) { return t.kind === 140; })
+                    return ts.isUnionTypeNode(withoutParens) && ts.find(withoutParens.types, function (t) { return t.kind === 140 /* UndefinedKeyword */; })
                         ? clone
-                        : ts.createUnionTypeNode([clone, ts.createKeywordTypeNode(140)]);
+                        : ts.createUnionTypeNode([clone, ts.createKeywordTypeNode(140 /* UndefinedKeyword */)]);
                 }
             }
+            /**
+             * Result of 'extractRange' operation for a specific scope.
+             * Stores either a list of changes that should be applied to extract a range or a list of errors
+             */
             function extractConstantInScope(node, scope, _a, rangeFacts, context) {
                 var substitutions = _a.substitutions;
                 var checker = context.program.getTypeChecker();
+                // Make a unique name for the extracted variable
                 var file = scope.getSourceFile();
                 var localNameText = ts.getUniqueName(ts.isClassLike(scope) ? "newProperty" : "newLocal", file);
                 var isJS = ts.isInJavaScriptFile(scope);
                 var variableType = isJS || !checker.isContextSensitive(node)
                     ? undefined
-                    : checker.typeToTypeNode(checker.getContextualType(node), scope, 1);
+                    : checker.typeToTypeNode(checker.getContextualType(node), scope, 1 /* NoTruncation */); // TODO: GH#18217
                 var initializer = transformConstantInitializer(node, substitutions);
                 ts.suppressLeadingAndTrailingTrivia(initializer);
                 var changeTracker = ts.textChanges.ChangeTracker.fromContext(context);
                 if (ts.isClassLike(scope)) {
-                    ts.Debug.assert(!isJS);
+                    ts.Debug.assert(!isJS); // See CannotExtractToJSClass
                     var modifiers = [];
-                    modifiers.push(ts.createToken(112));
+                    modifiers.push(ts.createToken(112 /* PrivateKeyword */));
                     if (rangeFacts & RangeFacts.InStaticRegion) {
-                        modifiers.push(ts.createToken(115));
+                        modifiers.push(ts.createToken(115 /* StaticKeyword */));
                     }
-                    modifiers.push(ts.createToken(132));
-                    var newVariable = ts.createProperty(undefined, modifiers, localNameText, undefined, variableType, initializer);
+                    modifiers.push(ts.createToken(132 /* ReadonlyKeyword */));
+                    var newVariable = ts.createProperty(
+                    /*decorators*/ undefined, modifiers, localNameText, 
+                    /*questionToken*/ undefined, variableType, initializer);
                     var localReference = ts.createPropertyAccess(rangeFacts & RangeFacts.InStaticRegion
-                        ? ts.createIdentifier(scope.name.getText())
+                        ? ts.createIdentifier(scope.name.getText()) // TODO: GH#18217
                         : ts.createThis(), ts.createIdentifier(localNameText));
+                    // Declare
                     var maxInsertionPos = node.pos;
                     var nodeToInsertBefore = getNodeToInsertPropertyBefore(maxInsertionPos, scope);
-                    changeTracker.insertNodeBefore(context.file, nodeToInsertBefore, newVariable, true);
+                    changeTracker.insertNodeBefore(context.file, nodeToInsertBefore, newVariable, /*blankLineBetween*/ true);
+                    // Consume
                     changeTracker.replaceNode(context.file, node, localReference);
                 }
                 else {
                     var newVariableDeclaration = ts.createVariableDeclaration(localNameText, variableType, initializer);
+                    // If the node is part of an initializer in a list of variable declarations, insert a new
+                    // variable declaration into the list (in case it depends on earlier ones).
+                    // CONSIDER: If the declaration list isn't const, we might want to split it into multiple
+                    // lists so that the newly extracted one can be const.
                     var oldVariableDeclaration = getContainingVariableDeclarationIfInList(node, scope);
                     if (oldVariableDeclaration) {
+                        // Declare
+                        // CONSIDER: could detect that each is on a separate line (See `extractConstant_VariableList_MultipleLines` in `extractConstants.ts`)
                         changeTracker.insertNodeBefore(context.file, oldVariableDeclaration, newVariableDeclaration);
+                        // Consume
                         var localReference = ts.createIdentifier(localNameText);
                         changeTracker.replaceNode(context.file, node, localReference);
                     }
-                    else if (node.parent.kind === 216 && scope === ts.findAncestor(node, isScope)) {
-                        var newVariableStatement = ts.createVariableStatement(undefined, ts.createVariableDeclarationList([newVariableDeclaration], 2));
+                    else if (node.parent.kind === 216 /* ExpressionStatement */ && scope === ts.findAncestor(node, isScope)) {
+                        // If the parent is an expression statement and the target scope is the immediately enclosing one,
+                        // replace the statement with the declaration.
+                        var newVariableStatement = ts.createVariableStatement(
+                        /*modifiers*/ undefined, ts.createVariableDeclarationList([newVariableDeclaration], 2 /* Const */));
                         changeTracker.replaceNode(context.file, node.parent, newVariableStatement);
                     }
                     else {
-                        var newVariableStatement = ts.createVariableStatement(undefined, ts.createVariableDeclarationList([newVariableDeclaration], 2));
+                        var newVariableStatement = ts.createVariableStatement(
+                        /*modifiers*/ undefined, ts.createVariableDeclarationList([newVariableDeclaration], 2 /* Const */));
+                        // Declare
                         var nodeToInsertBefore = getNodeToInsertConstantBefore(node, scope);
                         if (nodeToInsertBefore.pos === 0) {
-                            changeTracker.insertNodeAtTopOfFile(context.file, newVariableStatement, false);
+                            changeTracker.insertNodeAtTopOfFile(context.file, newVariableStatement, /*blankLineBetween*/ false);
                         }
                         else {
-                            changeTracker.insertNodeBefore(context.file, nodeToInsertBefore, newVariableStatement, false);
+                            changeTracker.insertNodeBefore(context.file, nodeToInsertBefore, newVariableStatement, /*blankLineBetween*/ false);
                         }
-                        if (node.parent.kind === 216) {
+                        // Consume
+                        if (node.parent.kind === 216 /* ExpressionStatement */) {
+                            // If the parent is an expression statement, delete it.
                             changeTracker.deleteNode(context.file, node.parent, ts.textChanges.useNonAdjustedPositions);
                         }
                         else {
@@ -88173,7 +106385,7 @@ var ts;
                 }
                 var edits = changeTracker.getChanges();
                 var renameFilename = node.getSourceFile().fileName;
-                var renameLocation = ts.getRenameLocation(edits, renameFilename, localNameText, true);
+                var renameLocation = ts.getRenameLocation(edits, renameFilename, localNameText, /*isDeclaredBeforeUse*/ true);
                 return { renameFilename: renameFilename, renameLocation: renameLocation, edits: edits };
             }
             function getContainingVariableDeclarationIfInList(node, scope) {
@@ -88212,7 +106424,7 @@ var ts;
             function getCalledExpression(scope, range, functionNameText) {
                 var functionReference = ts.createIdentifier(functionNameText);
                 if (ts.isClassLike(scope)) {
-                    var lhs = range.facts & RangeFacts.InStaticRegion ? ts.createIdentifier(scope.name.text) : ts.createThis();
+                    var lhs = range.facts & RangeFacts.InStaticRegion ? ts.createIdentifier(scope.name.text) : ts.createThis(); // TODO: GH#18217
                     return ts.createPropertyAccess(lhs, functionReference);
                 }
                 else {
@@ -88222,14 +106434,18 @@ var ts;
             function transformFunctionBody(body, exposedVariableDeclarations, writes, substitutions, hasReturn) {
                 var hasWritesOrVariableDeclarations = writes !== undefined || exposedVariableDeclarations.length > 0;
                 if (ts.isBlock(body) && !hasWritesOrVariableDeclarations && substitutions.size === 0) {
-                    return { body: ts.createBlock(body.statements, true), returnValueProperty: undefined };
+                    // already block, no declarations or writes to propagate back, no substitutions - can use node as is
+                    return { body: ts.createBlock(body.statements, /*multLine*/ true), returnValueProperty: undefined };
                 }
                 var returnValueProperty;
                 var ignoreReturns = false;
                 var statements = ts.createNodeArray(ts.isBlock(body) ? body.statements.slice(0) : [ts.isStatement(body) ? body : ts.createReturn(body)]);
+                // rewrite body if either there are writes that should be propagated back via return statements or there are substitutions
                 if (hasWritesOrVariableDeclarations || substitutions.size) {
                     var rewrittenStatements = ts.visitNodes(statements, visitor).slice();
                     if (hasWritesOrVariableDeclarations && !hasReturn && ts.isStatement(body)) {
+                        // add return at the end to propagate writes back in case if control flow falls out of the function body
+                        // it is ok to know that range has at least one return since it we only allow unconditional returns
                         var assignments = getPropertyAssignmentsForWritesAndVariableDeclarations(exposedVariableDeclarations, writes);
                         if (assignments.length === 1) {
                             rewrittenStatements.push(ts.createReturn(assignments[0].name));
@@ -88238,13 +106454,13 @@ var ts;
                             rewrittenStatements.push(ts.createReturn(ts.createObjectLiteral(assignments)));
                         }
                     }
-                    return { body: ts.createBlock(rewrittenStatements, true), returnValueProperty: returnValueProperty };
+                    return { body: ts.createBlock(rewrittenStatements, /*multiLine*/ true), returnValueProperty: returnValueProperty };
                 }
                 else {
-                    return { body: ts.createBlock(statements, true), returnValueProperty: undefined };
+                    return { body: ts.createBlock(statements, /*multiLine*/ true), returnValueProperty: undefined };
                 }
                 function visitor(node) {
-                    if (!ignoreReturns && node.kind === 225 && hasWritesOrVariableDeclarations) {
+                    if (!ignoreReturns && node.kind === 225 /* ReturnStatement */ && hasWritesOrVariableDeclarations) {
                         var assignments = getPropertyAssignmentsForWritesAndVariableDeclarations(exposedVariableDeclarations, writes);
                         if (node.expression) {
                             if (!returnValueProperty) {
@@ -88280,7 +106496,7 @@ var ts;
             }
             function getStatementsOrClassElements(scope) {
                 if (ts.isFunctionLikeDeclaration(scope)) {
-                    var body = scope.body;
+                    var body = scope.body; // TODO: GH#18217
                     if (ts.isBlock(body)) {
                         return body.statements;
                     }
@@ -88296,6 +106512,10 @@ var ts;
                 }
                 return ts.emptyArray;
             }
+            /**
+             * If `scope` contains a function after `minPos`, then return the first such function.
+             * Otherwise, return `undefined`.
+             */
             function getNodeToInsertFunctionBefore(minPos, scope) {
                 return ts.find(getStatementsOrClassElements(scope), function (child) {
                     return child.pos >= minPos && ts.isFunctionLikeDeclaration(child) && !ts.isConstructorDeclaration(child);
@@ -88303,15 +106523,17 @@ var ts;
             }
             function getNodeToInsertPropertyBefore(maxPos, scope) {
                 var members = scope.members;
-                ts.Debug.assert(members.length > 0);
+                ts.Debug.assert(members.length > 0); // There must be at least one child, since we extracted from one.
                 var prevMember;
                 var allProperties = true;
-                for (var _i = 0, members_7 = members; _i < members_7.length; _i++) {
-                    var member = members_7[_i];
+                for (var _i = 0, members_2 = members; _i < members_2.length; _i++) {
+                    var member = members_2[_i];
                     if (member.pos > maxPos) {
                         return prevMember || members[0];
                     }
                     if (allProperties && !ts.isPropertyDeclaration(member)) {
+                        // If it is non-vacuously true that all preceding members are properties,
+                        // insert before the current member (i.e. at the end of the list of properties).
                         if (prevMember !== undefined) {
                             return member;
                         }
@@ -88320,7 +106542,7 @@ var ts;
                     prevMember = member;
                 }
                 if (prevMember === undefined)
-                    return ts.Debug.fail();
+                    return ts.Debug.fail(); // If the loop didn't return, then it did set prevMember.
                 return prevMember;
             }
             function getNodeToInsertConstantBefore(node, scope) {
@@ -88342,9 +106564,11 @@ var ts;
                             prevStatement = statement;
                         }
                         if (!prevStatement && ts.isCaseClause(curr)) {
+                            // We must have been in the expression of the case clause.
                             ts.Debug.assert(ts.isSwitchStatement(curr.parent.parent));
                             return curr.parent.parent;
                         }
+                        // There must be at least one statement since we started in one.
                         return ts.Debug.assertDefined(prevStatement);
                     }
                     ts.Debug.assert(curr !== scope, "Didn't encounter a block-like before encountering scope");
@@ -88353,6 +106577,7 @@ var ts;
             function getPropertyAssignmentsForWritesAndVariableDeclarations(exposedVariableDeclarations, writes) {
                 var variableAssignments = ts.map(exposedVariableDeclarations, function (v) { return ts.createShorthandPropertyAssignment(v.symbol.name); });
                 var writeAssignments = ts.map(writes, function (w) { return ts.createShorthandPropertyAssignment(w.symbol.name); });
+                // TODO: GH#18217 `variableAssignments` not possibly undefined!
                 return variableAssignments === undefined
                     ? writeAssignments
                     : writeAssignments === undefined
@@ -88362,6 +106587,15 @@ var ts;
             function isReadonlyArray(v) {
                 return ts.isArray(v);
             }
+            /**
+             * Produces a range that spans the entirety of nodes, given a selection
+             * that might start/end in the middle of nodes.
+             *
+             * For example, when the user makes a selection like this
+             *                     v---v
+             *   var someThing = foo + bar;
+             *  this returns     ^-------^
+             */
             function getEnclosingTextRange(targetRange, sourceFile) {
                 return isReadonlyArray(targetRange.range)
                     ? { pos: ts.first(targetRange.range).getStart(sourceFile), end: ts.last(targetRange.range).getEnd() }
@@ -88369,17 +106603,19 @@ var ts;
             }
             var Usage;
             (function (Usage) {
+                // value should be passed to extracted method
                 Usage[Usage["Read"] = 1] = "Read";
+                // value should be passed to extracted method and propagated back
                 Usage[Usage["Write"] = 2] = "Write";
             })(Usage || (Usage = {}));
             function collectReadsAndWrites(targetRange, scopes, enclosingTextRange, sourceFile, checker, cancellationToken) {
-                var allTypeParameterUsages = ts.createMap();
+                var allTypeParameterUsages = ts.createMap(); // Key is type ID
                 var usagesPerScope = [];
                 var substitutionsPerScope = [];
                 var functionErrorsPerScope = [];
                 var constantErrorsPerScope = [];
                 var visibleDeclarationsInExtractedRange = [];
-                var exposedVariableSymbolSet = ts.createMap();
+                var exposedVariableSymbolSet = ts.createMap(); // Key is symbol ID
                 var exposedVariableDeclarations = [];
                 var firstExposedNonVariableDeclaration;
                 var expression = !isReadonlyArray(targetRange.range)
@@ -88394,14 +106630,15 @@ var ts;
                     var end = ts.last(statements).end;
                     expressionDiagnostic = ts.createFileDiagnostic(sourceFile, start, end - start, Messages.expressionExpected);
                 }
-                else if (checker.getTypeAtLocation(expression).flags & (4096 | 32768)) {
+                else if (checker.getTypeAtLocation(expression).flags & (4096 /* Void */ | 32768 /* Never */)) { // TODO: GH#18217
                     expressionDiagnostic = ts.createDiagnosticForNode(expression, Messages.uselessConstantType);
                 }
+                // initialize results
                 for (var _i = 0, scopes_1 = scopes; _i < scopes_1.length; _i++) {
                     var scope = scopes_1[_i];
                     usagesPerScope.push({ usages: ts.createMap(), typeParameterUsages: ts.createMap(), substitutions: ts.createMap() });
                     substitutionsPerScope.push(ts.createMap());
-                    functionErrorsPerScope.push(ts.isFunctionLikeDeclaration(scope) && scope.kind !== 234
+                    functionErrorsPerScope.push(ts.isFunctionLikeDeclaration(scope) && scope.kind !== 234 /* FunctionDeclaration */
                         ? [ts.createDiagnosticForNode(scope, Messages.cannotExtractToOtherFunctionLike)]
                         : []);
                     var constantErrors = [];
@@ -88412,6 +106649,7 @@ var ts;
                         constantErrors.push(ts.createDiagnosticForNode(scope, Messages.cannotExtractToJSClass));
                     }
                     if (ts.isArrowFunction(scope) && !ts.isBlock(scope.body)) {
+                        // TODO (https://github.com/Microsoft/TypeScript/issues/18924): allow this
                         constantErrors.push(ts.createDiagnosticForNode(scope, Messages.cannotExtractToExpressionArrowFunction));
                     }
                     constantErrorsPerScope.push(constantErrors);
@@ -88421,20 +106659,25 @@ var ts;
                 var unmodifiedNode = isReadonlyArray(targetRange.range) ? ts.first(targetRange.range) : targetRange.range;
                 var inGenericContext = isInGenericContext(unmodifiedNode);
                 collectUsages(target);
+                // Unfortunately, this code takes advantage of the knowledge that the generated method
+                // will use the contextual type of an expression as the return type of the extracted
+                // method (and will therefore "use" all the types involved).
                 if (inGenericContext && !isReadonlyArray(targetRange.range)) {
-                    var contextualType = checker.getContextualType(targetRange.range);
+                    var contextualType = checker.getContextualType(targetRange.range); // TODO: GH#18217
                     recordTypeParameterUsages(contextualType);
                 }
                 if (allTypeParameterUsages.size > 0) {
-                    var seenTypeParameterUsages = ts.createMap();
+                    var seenTypeParameterUsages = ts.createMap(); // Key is type ID
                     var i_1 = 0;
                     for (var curr = unmodifiedNode; curr !== undefined && i_1 < scopes.length; curr = curr.parent) {
                         if (curr === scopes[i_1]) {
+                            // Copy current contents of seenTypeParameterUsages into scope.
                             seenTypeParameterUsages.forEach(function (typeParameter, id) {
                                 usagesPerScope[i_1].typeParameterUsages.set(id, typeParameter);
                             });
                             i_1++;
                         }
+                        // Note that we add the current node's type parameters *after* updating the corresponding scope.
                         if (ts.isDeclarationWithTypeParameters(curr)) {
                             for (var _a = 0, _b = ts.getEffectiveTypeParameterDeclarations(curr); _a < _b.length; _a++) {
                                 var typeParameterDecl = _b[_a];
@@ -88445,16 +106688,24 @@ var ts;
                             }
                         }
                     }
+                    // If we didn't get through all the scopes, then there were some that weren't in our
+                    // parent chain (impossible at time of writing).  A conservative solution would be to
+                    // copy allTypeParameterUsages into all remaining scopes.
                     ts.Debug.assert(i_1 === scopes.length);
                 }
+                // If there are any declarations in the extracted block that are used in the same enclosing
+                // lexical scope, we can't move the extraction "up" as those declarations will become unreachable
                 if (visibleDeclarationsInExtractedRange.length) {
                     var containingLexicalScopeOfExtraction = ts.isBlockScope(scopes[0], scopes[0].parent)
                         ? scopes[0]
                         : ts.getEnclosingBlockScopeContainer(scopes[0]);
                     ts.forEachChild(containingLexicalScopeOfExtraction, checkForUsedDeclarations);
                 }
-                var _loop_23 = function (i) {
+                var _loop_12 = function (i) {
                     var scopeUsages = usagesPerScope[i];
+                    // Special case: in the innermost scope, all usages are available.
+                    // (The computed value reflects the value at the top-level of the scope, but the
+                    // local will actually be declared at the same level as the extracted expression).
                     if (i > 0 && (scopeUsages.usages.size > 0 || scopeUsages.typeParameterUsages.size > 0)) {
                         var errorNode = isReadonlyArray(targetRange.range) ? targetRange.range[0] : targetRange.range;
                         constantErrorsPerScope[i].push(ts.createDiagnosticForNode(errorNode, Messages.cannotAccessVariablesFromNestedScopes));
@@ -88462,15 +106713,16 @@ var ts;
                     var hasWrite = false;
                     var readonlyClassPropertyWrite;
                     usagesPerScope[i].usages.forEach(function (value) {
-                        if (value.usage === 2) {
+                        if (value.usage === 2 /* Write */) {
                             hasWrite = true;
-                            if (value.symbol.flags & 106500 &&
+                            if (value.symbol.flags & 106500 /* ClassMember */ &&
                                 value.symbol.valueDeclaration &&
-                                ts.hasModifier(value.symbol.valueDeclaration, 64)) {
+                                ts.hasModifier(value.symbol.valueDeclaration, 64 /* Readonly */)) {
                                 readonlyClassPropertyWrite = value.symbol.valueDeclaration;
                             }
                         }
                     });
+                    // If an expression was extracted, then there shouldn't have been any variable declarations.
                     ts.Debug.assert(isReadonlyArray(targetRange.range) || exposedVariableDeclarations.length === 0);
                     if (hasWrite && !isReadonlyArray(targetRange.range)) {
                         var diag = ts.createDiagnosticForNode(targetRange.range, Messages.cannotWriteInExpression);
@@ -88489,13 +106741,16 @@ var ts;
                     }
                 };
                 for (var i = 0; i < scopes.length; i++) {
-                    _loop_23(i);
+                    _loop_12(i);
                 }
                 return { target: target, usagesPerScope: usagesPerScope, functionErrorsPerScope: functionErrorsPerScope, constantErrorsPerScope: constantErrorsPerScope, exposedVariableDeclarations: exposedVariableDeclarations };
                 function isInGenericContext(node) {
                     return !!ts.findAncestor(node, function (n) { return ts.isDeclarationWithTypeParameters(n) && ts.getEffectiveTypeParameterDeclarations(n).length !== 0; });
                 }
                 function recordTypeParameterUsages(type) {
+                    // PERF: This is potentially very expensive.  `type` could be a library type with
+                    // a lot of properties, each of which the walker will visit.  Unfortunately, the
+                    // solution isn't as trivial as filtering to user types because of (e.g.) Array.
                     var symbolWalker = checker.getSymbolWalker(function () { return (cancellationToken.throwIfCancellationRequested(), true); });
                     var visitedTypes = symbolWalker.walkType(type).visitedTypes;
                     for (var _i = 0, visitedTypes_1 = visitedTypes; _i < visitedTypes_1.length; _i++) {
@@ -88506,22 +106761,24 @@ var ts;
                     }
                 }
                 function collectUsages(node, valueUsage) {
-                    if (valueUsage === void 0) { valueUsage = 1; }
+                    if (valueUsage === void 0) { valueUsage = 1 /* Read */; }
                     if (inGenericContext) {
-                        var type = checker.getTypeAtLocation(node);
+                        var type = checker.getTypeAtLocation(node); // TODO: GH#18217
                         recordTypeParameterUsages(type);
                     }
                     if (ts.isDeclaration(node) && node.symbol) {
                         visibleDeclarationsInExtractedRange.push(node);
                     }
                     if (ts.isAssignmentExpression(node)) {
-                        collectUsages(node.left, 2);
+                        // use 'write' as default usage for values
+                        collectUsages(node.left, 2 /* Write */);
                         collectUsages(node.right);
                     }
                     else if (ts.isUnaryExpressionWithWrite(node)) {
-                        collectUsages(node.operand, 2);
+                        collectUsages(node.operand, 2 /* Write */);
                     }
                     else if (ts.isPropertyAccessExpression(node) || ts.isElementAccessExpression(node)) {
+                        // use 'write' as default usage for values
                         ts.forEachChild(node, collectUsages);
                     }
                     else if (ts.isIdentifier(node)) {
@@ -88534,7 +106791,7 @@ var ts;
                         if (ts.isPropertyAccessExpression(node.parent) && node !== node.parent.expression) {
                             return;
                         }
-                        recordUsage(node, valueUsage, ts.isPartOfTypeNode(node));
+                        recordUsage(node, valueUsage, /*isTypeNode*/ ts.isPartOfTypeNode(node));
                     }
                     else {
                         ts.forEachChild(node, collectUsages);
@@ -88544,6 +106801,7 @@ var ts;
                     var symbolId = recordUsagebySymbol(n, usage, isTypeNode);
                     if (symbolId) {
                         for (var i = 0; i < scopes.length; i++) {
+                            // push substitution from map<symbolId, subst> to map<nodeId, subst> to simplify rewriting
                             var substitution = substitutionsPerScope[i].get(symbolId);
                             if (substitution) {
                                 usagesPerScope[i].substitutions.set(ts.getNodeId(n).toString(), substitution);
@@ -88554,15 +106812,24 @@ var ts;
                 function recordUsagebySymbol(identifier, usage, isTypeName) {
                     var symbol = getSymbolReferencedByIdentifier(identifier);
                     if (!symbol) {
+                        // cannot find symbol - do nothing
                         return undefined;
                     }
                     var symbolId = ts.getSymbolId(symbol).toString();
                     var lastUsage = seenUsages.get(symbolId);
+                    // there are two kinds of value usages
+                    // - reads - if range contains a read from the value located outside of the range then value should be passed as a parameter
+                    // - writes - if range contains a write to a value located outside the range the value should be passed as a parameter and
+                    //   returned as a return value
+                    // 'write' case is a superset of 'read' so if we already have processed 'write' of some symbol there is not need to handle 'read'
+                    // since all information is already recorded
                     if (lastUsage && lastUsage >= usage) {
                         return symbolId;
                     }
                     seenUsages.set(symbolId, usage);
                     if (lastUsage) {
+                        // if we get here this means that we are trying to handle 'write' and 'read' was already processed
+                        // walk scopes and update existing records.
                         for (var _i = 0, usagesPerScope_1 = usagesPerScope; _i < usagesPerScope_1.length; _i++) {
                             var perScope = usagesPerScope_1[_i];
                             var prevEntry = perScope.usages.get(identifier.text);
@@ -88572,15 +106839,19 @@ var ts;
                         }
                         return symbolId;
                     }
+                    // find first declaration in this file
                     var decls = symbol.getDeclarations();
                     var declInFile = decls && ts.find(decls, function (d) { return d.getSourceFile() === sourceFile; });
                     if (!declInFile) {
                         return undefined;
                     }
                     if (ts.rangeContainsStartEnd(enclosingTextRange, declInFile.getStart(), declInFile.end)) {
+                        // declaration is located in range to be extracted - do nothing
                         return undefined;
                     }
-                    if (targetRange.facts & RangeFacts.IsGenerator && usage === 2) {
+                    if (targetRange.facts & RangeFacts.IsGenerator && usage === 2 /* Write */) {
+                        // this is write to a reference located outside of the target scope and range is extracted into generator
+                        // currently this is unsupported scenario
                         var diag = ts.createDiagnosticForNode(identifier, Messages.cannotExtractRangeThatContainsWritesToReferencesLocatedOutsideOfTheTargetRangeInGenerators);
                         for (var _a = 0, functionErrorsPerScope_1 = functionErrorsPerScope; _a < functionErrorsPerScope_1.length; _a++) {
                             var errors = functionErrorsPerScope_1[_a];
@@ -88593,7 +106864,7 @@ var ts;
                     }
                     for (var i = 0; i < scopes.length; i++) {
                         var scope = scopes[i];
-                        var resolvedSymbol = checker.resolveName(symbol.name, scope, symbol.flags, false);
+                        var resolvedSymbol = checker.resolveName(symbol.name, scope, symbol.flags, /*excludeGlobals*/ false);
                         if (resolvedSymbol === symbol) {
                             continue;
                         }
@@ -88603,7 +106874,9 @@ var ts;
                                 substitutionsPerScope[i].set(symbolId, substitution);
                             }
                             else if (isTypeName) {
-                                if (!(symbol.flags & 262144)) {
+                                // If the symbol is a type parameter that won't be in scope, we'll pass it as a type argument
+                                // so there's no problem.
+                                if (!(symbol.flags & 262144 /* TypeParameter */)) {
                                     var diag = ts.createDiagnosticForNode(identifier, Messages.typeWillNotBeVisibleInTheNewScope);
                                     functionErrorsPerScope[i].push(diag);
                                     constantErrorsPerScope[i].push(diag);
@@ -88617,9 +106890,11 @@ var ts;
                     return symbolId;
                 }
                 function checkForUsedDeclarations(node) {
+                    // If this node is entirely within the original extraction range, we don't need to do anything.
                     if (node === targetRange.range || (isReadonlyArray(targetRange.range) && targetRange.range.indexOf(node) >= 0)) {
                         return;
                     }
+                    // Otherwise check and recurse.
                     var sym = ts.isIdentifier(node)
                         ? getSymbolReferencedByIdentifier(node)
                         : checker.getSymbolAtLocation(node);
@@ -88634,13 +106909,20 @@ var ts;
                                 }
                             }
                             else {
+                                // CONSIDER: this includes binding elements, which we could
+                                // expose in the same way as variables.
                                 firstExposedNonVariableDeclaration = firstExposedNonVariableDeclaration || decl;
                             }
                         }
                     }
                     ts.forEachChild(node, checkForUsedDeclarations);
                 }
+                /**
+                 * Return the symbol referenced by an identifier (even if it declares a different symbol).
+                 */
                 function getSymbolReferencedByIdentifier(identifier) {
+                    // If the identifier is both a property name and its value, we're only interested in its value
+                    // (since the name is a declaration and will be included in the extracted range).
                     return identifier.parent && ts.isShorthandPropertyAssignment(identifier.parent) && identifier.parent.name === identifier
                         ? checker.getShorthandAssignmentValueSymbol(identifier.parent)
                         : checker.getSymbolAtLocation(identifier);
@@ -88662,33 +106944,40 @@ var ts;
                         : ts.createPropertyAccess(prefix, symbol.name);
                 }
             }
+            /**
+             * Computes whether or not a node represents an expression in a position where it could
+             * be extracted.
+             * The isExpression() in utilities.ts returns some false positives we need to handle,
+             * such as `import x from 'y'` -- the 'y' is a StringLiteral but is *not* an expression
+             * in the sense of something that you could extract on
+             */
             function isExtractableExpression(node) {
                 var parent = node.parent;
                 switch (parent.kind) {
-                    case 273:
+                    case 273 /* EnumMember */:
                         return false;
                 }
                 switch (node.kind) {
-                    case 9:
-                        return parent.kind !== 244 &&
-                            parent.kind !== 248;
-                    case 204:
-                    case 180:
-                    case 182:
+                    case 9 /* StringLiteral */:
+                        return parent.kind !== 244 /* ImportDeclaration */ &&
+                            parent.kind !== 248 /* ImportSpecifier */;
+                    case 204 /* SpreadElement */:
+                    case 180 /* ObjectBindingPattern */:
+                    case 182 /* BindingElement */:
                         return false;
-                    case 71:
-                        return parent.kind !== 182 &&
-                            parent.kind !== 248 &&
-                            parent.kind !== 252;
+                    case 71 /* Identifier */:
+                        return parent.kind !== 182 /* BindingElement */ &&
+                            parent.kind !== 248 /* ImportSpecifier */ &&
+                            parent.kind !== 252 /* ExportSpecifier */;
                 }
                 return true;
             }
             function isBlockLike(node) {
                 switch (node.kind) {
-                    case 213:
-                    case 274:
-                    case 240:
-                    case 266:
+                    case 213 /* Block */:
+                    case 274 /* SourceFile */:
+                    case 240 /* ModuleBlock */:
+                    case 266 /* CaseClause */:
                         return true;
                     default:
                         return false;
@@ -88697,6 +106986,7 @@ var ts;
         })(extractSymbol = refactor.extractSymbol || (refactor.extractSymbol = {}));
     })(refactor = ts.refactor || (ts.refactor = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var refactor;
@@ -88733,18 +107023,20 @@ var ts;
                 ts.suppressLeadingAndTrailingTrivia(declaration);
                 ts.suppressLeadingAndTrailingTrivia(container);
                 var isInClassLike = ts.isClassLike(container);
-                var modifierFlags = ts.getModifierFlags(declaration) & ~64;
+                // avoid Readonly modifier because it will convert to get accessor
+                var modifierFlags = ts.getModifierFlags(declaration) & ~64 /* Readonly */;
                 var accessorModifiers = isInClassLike
-                    ? !modifierFlags || modifierFlags & 8
-                        ? getModifiers(isJS, isStatic, 114)
+                    ? !modifierFlags || modifierFlags & 8 /* Private */
+                        ? getModifiers(isJS, isStatic, 114 /* PublicKeyword */)
                         : ts.createNodeArray(ts.createModifiersFromModifierFlags(modifierFlags))
                     : undefined;
-                var fieldModifiers = isInClassLike ? getModifiers(isJS, isStatic, 112) : undefined;
+                var fieldModifiers = isInClassLike ? getModifiers(isJS, isStatic, 112 /* PrivateKeyword */) : undefined;
                 updateFieldDeclaration(changeTracker, file, declaration, fieldName, fieldModifiers);
                 var getAccessor = generateGetAccessor(fieldName, accessorName, type, accessorModifiers, isStatic, container);
                 ts.suppressLeadingAndTrailingTrivia(getAccessor);
                 insertAccessor(changeTracker, file, getAccessor, declaration, container);
                 if (isReadonly) {
+                    // readonly modifier only existed in classLikeDeclaration
                     var constructor = ts.getFirstConstructorWithBody(container);
                     if (constructor) {
                         updateReadonlyPropertyInitializerStatementConstructor(changeTracker, context, constructor, fieldName, originalName);
@@ -88759,7 +107051,7 @@ var ts;
                 var renameFilename = file.fileName;
                 var nameNeedRename = renameAccessor ? accessorName : fieldName;
                 var renameLocationOffset = ts.isIdentifier(nameNeedRename) ? 0 : -1;
-                var renameLocation = renameLocationOffset + ts.getRenameLocation(edits, renameFilename, nameNeedRename.text, ts.isParameter(declaration));
+                var renameLocation = renameLocationOffset + ts.getRenameLocation(edits, renameFilename, nameNeedRename.text, /*preferLastLocation*/ ts.isParameter(declaration));
                 return { renameFilename: renameFilename, renameLocation: renameLocation, edits: edits };
             }
             function isConvertibleName(name) {
@@ -88772,22 +107064,23 @@ var ts;
                 return ts.isIdentifier(originalName) ? ts.createIdentifier(name) : ts.createLiteral(name);
             }
             function createAccessorAccessExpression(fieldName, isStatic, container) {
-                var leftHead = isStatic ? container.name : ts.createThis();
+                var leftHead = isStatic ? container.name : ts.createThis(); // TODO: GH#18217
                 return ts.isIdentifier(fieldName) ? ts.createPropertyAccess(leftHead, fieldName) : ts.createElementAccess(leftHead, ts.createLiteral(fieldName));
             }
             function getModifiers(isJS, isStatic, accessModifier) {
-                var modifiers = ts.append(!isJS ? [ts.createToken(accessModifier)] : undefined, isStatic ? ts.createToken(115) : undefined);
+                var modifiers = ts.append(!isJS ? [ts.createToken(accessModifier)] : undefined, isStatic ? ts.createToken(115 /* StaticKeyword */) : undefined);
                 return modifiers && ts.createNodeArray(modifiers);
             }
             function startsWithUnderscore(name) {
-                return name.charCodeAt(0) === 95;
+                return name.charCodeAt(0) === 95 /* _ */;
             }
             function getConvertibleFieldAtPosition(context, file) {
                 var startPosition = context.startPosition, endPosition = context.endPosition;
-                var node = ts.getTokenAtPosition(file, startPosition, false);
+                var node = ts.getTokenAtPosition(file, startPosition, /*includeJsDocComment*/ false);
                 var declaration = ts.findAncestor(node.parent, isAcceptedDeclaration);
-                var meaning = 28 | 32 | 64;
-                if (!declaration || !ts.rangeOverlapsWithStartEnd(declaration.name, startPosition, endPosition)
+                // make sure declaration have AccessibilityModifier or Static Modifier or Readonly Modifier
+                var meaning = 28 /* AccessibilityModifier */ | 32 /* Static */ | 64 /* Readonly */;
+                if (!declaration || !ts.rangeOverlapsWithStartEnd(declaration.name, startPosition, endPosition) // TODO: GH#18217
                     || !isConvertibleName(declaration.name) || (ts.getModifierFlags(declaration) | meaning) !== meaning)
                     return undefined;
                 var name = declaration.name.text;
@@ -88798,7 +107091,7 @@ var ts;
                     isStatic: ts.hasStaticModifier(declaration),
                     isReadonly: ts.hasReadonlyModifier(declaration),
                     type: ts.getTypeAnnotationNode(declaration),
-                    container: declaration.kind === 149 ? declaration.parent.parent : declaration.parent,
+                    container: declaration.kind === 149 /* Parameter */ ? declaration.parent.parent : declaration.parent,
                     originalName: declaration.name,
                     declaration: declaration,
                     fieldName: fieldName,
@@ -88807,14 +107100,22 @@ var ts;
                 };
             }
             function generateGetAccessor(fieldName, accessorName, type, modifiers, isStatic, container) {
-                return ts.createGetAccessor(undefined, modifiers, accessorName, undefined, type, ts.createBlock([
+                return ts.createGetAccessor(
+                /*decorators*/ undefined, modifiers, accessorName, 
+                /*parameters*/ undefined, // TODO: GH#18217
+                type, ts.createBlock([
                     ts.createReturn(createAccessorAccessExpression(fieldName, isStatic, container))
-                ], true));
+                ], /*multiLine*/ true));
             }
             function generateSetAccessor(fieldName, accessorName, type, modifiers, isStatic, container) {
-                return ts.createSetAccessor(undefined, modifiers, accessorName, [ts.createParameter(undefined, undefined, undefined, ts.createIdentifier("value"), undefined, type)], ts.createBlock([
+                return ts.createSetAccessor(
+                /*decorators*/ undefined, modifiers, accessorName, [ts.createParameter(
+                    /*decorators*/ undefined, 
+                    /*modifiers*/ undefined, 
+                    /*dotDotDotToken*/ undefined, ts.createIdentifier("value"), 
+                    /*questionToken*/ undefined, type)], ts.createBlock([
                     ts.createStatement(ts.createAssignment(createAccessorAccessExpression(fieldName, isStatic, container), ts.createIdentifier("value")))
-                ], true));
+                ], /*multiLine*/ true));
             }
             function updatePropertyDeclaration(changeTracker, file, declaration, fieldName, modifiers) {
                 var property = ts.updateProperty(declaration, declaration.decorators, modifiers, fieldName, declaration.questionToken || declaration.exclamationToken, declaration.type, declaration.initializer);
@@ -88863,6 +107164,7 @@ var ts;
         })(generateGetAccessorAndSetAccessor = refactor.generateGetAccessorAndSetAccessor || (refactor.generateGetAccessorAndSetAccessor = {}));
     })(refactor = ts.refactor || (ts.refactor = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var refactor;
@@ -88893,9 +107195,11 @@ var ts;
             if (ts.isNamedDeclaration(startStatement) && startStatement.name && ts.rangeContainsRange(startStatement.name, range)) {
                 return { toMove: [statements[startNodeIndex]], afterLast: statements[startNodeIndex + 1] };
             }
+            // Can't only partially include the start node or be partially into the next node
             if (range.pos > startStatement.getStart(file))
                 return undefined;
             var afterEndNodeIndex = ts.findIndex(statements, function (s) { return s.end > range.end; }, startNodeIndex);
+            // Can't be partially into the next node
             if (afterEndNodeIndex !== -1 && (afterEndNodeIndex === 0 || statements[afterEndNodeIndex].getStart(file) < range.end))
                 return undefined;
             return {
@@ -88910,9 +107214,11 @@ var ts;
             var extension = ts.extensionFromPath(oldFile.fileName);
             var newModuleName = makeUniqueModuleName(getNewModuleName(usage.movedSymbols), extension, currentDirectory, host);
             var newFileNameWithExtension = newModuleName + extension;
+            // If previous file was global, this is easy.
             changes.createNewFile(oldFile, ts.combinePaths(currentDirectory, newFileNameWithExtension), getNewStatementsAndRemoveFromOldFile(oldFile, usage, changes, toMove, program, newModuleName, preferences));
             addNewFileToTsconfig(program, changes, oldFile.fileName, newFileNameWithExtension, ts.hostGetCanonicalFileName(host));
         }
+        // Filters imports out of the range of statements to move. Imports will be copied to the new file anyway, and may still be needed in the old file.
         function getStatementsToMove(context) {
             var rangeToMove = getRangeToMove(context);
             if (rangeToMove === undefined)
@@ -88929,12 +107235,12 @@ var ts;
         }
         function isPureImport(node) {
             switch (node.kind) {
-                case 244:
+                case 244 /* ImportDeclaration */:
                     return true;
-                case 243:
-                    return !ts.hasModifier(node, 1);
-                case 214:
-                    return node.declarationList.declarations.every(function (d) { return !!d.initializer && ts.isRequireCall(d.initializer, true); });
+                case 243 /* ImportEqualsDeclaration */:
+                    return !ts.hasModifier(node, 1 /* Export */);
+                case 214 /* VariableStatement */:
+                    return node.declarationList.declarations.every(function (d) { return !!d.initializer && ts.isRequireCall(d.initializer, /*checkArgumentIsStringLiteralLike*/ true); });
                 default:
                     return false;
             }
@@ -88960,14 +107266,15 @@ var ts;
                 return toMove.all;
             }
             var useEs6ModuleSyntax = !!oldFile.externalModuleIndicator;
-            var importsFromNewFile = createOldFileImportsFromNewFile(usage.oldFileImportsFromNewFile, newModuleName, useEs6ModuleSyntax, preferences);
+            var quotePreference = ts.getQuotePreference(oldFile, preferences);
+            var importsFromNewFile = createOldFileImportsFromNewFile(usage.oldFileImportsFromNewFile, newModuleName, useEs6ModuleSyntax, quotePreference);
             if (importsFromNewFile) {
-                changes.insertNodeBefore(oldFile, oldFile.statements[0], importsFromNewFile, true);
+                changes.insertNodeBefore(oldFile, oldFile.statements[0], importsFromNewFile, /*blankLineBetween*/ true);
             }
             deleteUnusedOldImports(oldFile, toMove.all, changes, usage.unusedImportsFromOldFile, checker);
             deleteMovedStatements(oldFile, toMove.ranges, changes);
             updateImportsInOtherFiles(changes, program, oldFile, usage.movedSymbols, newModuleName);
-            return getNewFileImportsAndAddExportInOldFile(oldFile, usage.oldImportsNeededByNewFile, usage.newFileImportsFromOldFile, changes, checker, useEs6ModuleSyntax, preferences).concat(addExports(oldFile, toMove.all, usage.oldFileImportsFromNewFile, useEs6ModuleSyntax));
+            return getNewFileImportsAndAddExportInOldFile(oldFile, usage.oldImportsNeededByNewFile, usage.newFileImportsFromOldFile, changes, checker, useEs6ModuleSyntax, quotePreference).concat(addExports(oldFile, toMove.all, usage.oldFileImportsFromNewFile, useEs6ModuleSyntax));
         }
         function deleteMovedStatements(sourceFile, moved, changes) {
             for (var _i = 0, moved_1 = moved; _i < moved_1.length; _i++) {
@@ -88985,20 +107292,20 @@ var ts;
         }
         function updateImportsInOtherFiles(changes, program, oldFile, movedSymbols, newModuleName) {
             var checker = program.getTypeChecker();
-            var _loop_24 = function (sourceFile) {
+            var _loop_13 = function (sourceFile) {
                 if (sourceFile === oldFile)
                     return "continue";
-                var _loop_25 = function (statement) {
+                var _loop_14 = function (statement) {
                     forEachImportInStatement(statement, function (importNode) {
                         if (checker.getSymbolAtLocation(moduleSpecifierFromImport(importNode)) !== oldFile.symbol)
                             return;
                         var shouldMove = function (name) {
                             var symbol = ts.isBindingElement(name.parent)
                                 ? ts.getPropertySymbolFromBindingElement(checker, name.parent)
-                                : ts.skipAlias(checker.getSymbolAtLocation(name), checker);
+                                : ts.skipAlias(checker.getSymbolAtLocation(name), checker); // TODO: GH#18217
                             return !!symbol && movedSymbols.has(symbol);
                         };
-                        deleteUnusedImports(sourceFile, importNode, changes, shouldMove);
+                        deleteUnusedImports(sourceFile, importNode, changes, shouldMove); // These will be changed to imports from the new file
                         var newModuleSpecifier = ts.combinePaths(ts.getDirectoryPath(moduleSpecifierFromImport(importNode).text), newModuleName);
                         var newImportDeclaration = filterImport(importNode, ts.createLiteral(newModuleSpecifier), shouldMove);
                         if (newImportDeclaration)
@@ -89010,35 +107317,35 @@ var ts;
                 };
                 for (var _i = 0, _a = sourceFile.statements; _i < _a.length; _i++) {
                     var statement = _a[_i];
-                    _loop_25(statement);
+                    _loop_14(statement);
                 }
             };
             for (var _i = 0, _a = program.getSourceFiles(); _i < _a.length; _i++) {
                 var sourceFile = _a[_i];
-                _loop_24(sourceFile);
+                _loop_13(sourceFile);
             }
         }
         function getNamespaceLikeImport(node) {
             switch (node.kind) {
-                case 244:
-                    return node.importClause && node.importClause.namedBindings && node.importClause.namedBindings.kind === 246 ?
+                case 244 /* ImportDeclaration */:
+                    return node.importClause && node.importClause.namedBindings && node.importClause.namedBindings.kind === 246 /* NamespaceImport */ ?
                         node.importClause.namedBindings.name : undefined;
-                case 243:
+                case 243 /* ImportEqualsDeclaration */:
                     return node.name;
-                case 232:
+                case 232 /* VariableDeclaration */:
                     return ts.tryCast(node.name, ts.isIdentifier);
                 default:
                     return ts.Debug.assertNever(node);
             }
         }
         function updateNamespaceLikeImport(changes, sourceFile, checker, movedSymbols, newModuleName, newModuleSpecifier, oldImportId, oldImportNode) {
-            var preferredNewNamespaceName = ts.codefix.moduleSpecifierToValidIdentifier(newModuleName, 6);
+            var preferredNewNamespaceName = ts.codefix.moduleSpecifierToValidIdentifier(newModuleName, 6 /* ESNext */);
             var needUniqueName = false;
             var toChange = [];
             ts.FindAllReferences.Core.eachSymbolReferenceInFile(oldImportId, checker, sourceFile, function (ref) {
                 if (!ts.isPropertyAccessExpression(ref.parent))
                     return;
-                needUniqueName = needUniqueName || !!checker.resolveName(preferredNewNamespaceName, ref, 67108863, true);
+                needUniqueName = needUniqueName || !!checker.resolveName(preferredNewNamespaceName, ref, 67108863 /* All */, /*excludeGlobals*/ true);
                 if (movedSymbols.has(checker.getSymbolAtLocation(ref.parent.name))) {
                     toChange.push(ref);
                 }
@@ -89056,19 +107363,20 @@ var ts;
             var newNamespaceId = ts.createIdentifier(newNamespaceName);
             var newModuleString = ts.createLiteral(newModuleSpecifier);
             switch (node.kind) {
-                case 244:
-                    return ts.createImportDeclaration(undefined, undefined, ts.createImportClause(undefined, ts.createNamespaceImport(newNamespaceId)), newModuleString);
-                case 243:
-                    return ts.createImportEqualsDeclaration(undefined, undefined, newNamespaceId, ts.createExternalModuleReference(newModuleString));
-                case 232:
-                    return ts.createVariableDeclaration(newNamespaceId, undefined, createRequireCall(newModuleString));
+                case 244 /* ImportDeclaration */:
+                    return ts.createImportDeclaration(
+                    /*decorators*/ undefined, /*modifiers*/ undefined, ts.createImportClause(/*name*/ undefined, ts.createNamespaceImport(newNamespaceId)), newModuleString);
+                case 243 /* ImportEqualsDeclaration */:
+                    return ts.createImportEqualsDeclaration(/*decorators*/ undefined, /*modifiers*/ undefined, newNamespaceId, ts.createExternalModuleReference(newModuleString));
+                case 232 /* VariableDeclaration */:
+                    return ts.createVariableDeclaration(newNamespaceId, /*type*/ undefined, createRequireCall(newModuleString));
                 default:
                     return ts.Debug.assertNever(node);
             }
         }
         function moduleSpecifierFromImport(i) {
-            return (i.kind === 244 ? i.moduleSpecifier
-                : i.kind === 243 ? i.moduleReference.expression
+            return (i.kind === 244 /* ImportDeclaration */ ? i.moduleSpecifier
+                : i.kind === 243 /* ImportEqualsDeclaration */ ? i.moduleReference.expression
                     : i.initializer.arguments[0]);
         }
         function forEachImportInStatement(statement, cb) {
@@ -89084,69 +107392,69 @@ var ts;
             else if (ts.isVariableStatement(statement)) {
                 for (var _i = 0, _a = statement.declarationList.declarations; _i < _a.length; _i++) {
                     var decl = _a[_i];
-                    if (decl.initializer && ts.isRequireCall(decl.initializer, true)) {
+                    if (decl.initializer && ts.isRequireCall(decl.initializer, /*checkArgumentIsStringLiteralLike*/ true)) {
                         cb(decl);
                     }
                 }
             }
         }
-        function createOldFileImportsFromNewFile(newFileNeedExport, newFileNameWithExtension, useEs6Imports, preferences) {
+        function createOldFileImportsFromNewFile(newFileNeedExport, newFileNameWithExtension, useEs6Imports, quotePreference) {
             var defaultImport;
             var imports = [];
             newFileNeedExport.forEach(function (symbol) {
-                if (symbol.escapedName === "default") {
-                    defaultImport = ts.createIdentifier(ts.symbolNameNoDefault(symbol));
+                if (symbol.escapedName === "default" /* Default */) {
+                    defaultImport = ts.createIdentifier(ts.symbolNameNoDefault(symbol)); // TODO: GH#18217
                 }
                 else {
                     imports.push(symbol.name);
                 }
             });
-            return makeImportOrRequire(defaultImport, imports, newFileNameWithExtension, useEs6Imports, preferences);
+            return makeImportOrRequire(defaultImport, imports, newFileNameWithExtension, useEs6Imports, quotePreference);
         }
-        function makeImportOrRequire(defaultImport, imports, path, useEs6Imports, preferences) {
+        function makeImportOrRequire(defaultImport, imports, path, useEs6Imports, quotePreference) {
             path = ts.ensurePathIsNonModuleName(path);
             if (useEs6Imports) {
-                var specifiers = imports.map(function (i) { return ts.createImportSpecifier(undefined, ts.createIdentifier(i)); });
-                return ts.makeImportIfNecessary(defaultImport, specifiers, path, preferences);
+                var specifiers = imports.map(function (i) { return ts.createImportSpecifier(/*propertyName*/ undefined, ts.createIdentifier(i)); });
+                return ts.makeImportIfNecessary(defaultImport, specifiers, path, quotePreference);
             }
             else {
-                ts.Debug.assert(!defaultImport);
-                var bindingElements = imports.map(function (i) { return ts.createBindingElement(undefined, undefined, i); });
+                ts.Debug.assert(!defaultImport); // If there's a default export, it should have been an es6 module.
+                var bindingElements = imports.map(function (i) { return ts.createBindingElement(/*dotDotDotToken*/ undefined, /*propertyName*/ undefined, i); });
                 return bindingElements.length
-                    ? makeVariableStatement(ts.createObjectBindingPattern(bindingElements), undefined, createRequireCall(ts.createLiteral(path)))
+                    ? makeVariableStatement(ts.createObjectBindingPattern(bindingElements), /*type*/ undefined, createRequireCall(ts.createLiteral(path)))
                     : undefined;
             }
         }
         function makeVariableStatement(name, type, initializer, flags) {
-            if (flags === void 0) { flags = 2; }
-            return ts.createVariableStatement(undefined, ts.createVariableDeclarationList([ts.createVariableDeclaration(name, type, initializer)], flags));
+            if (flags === void 0) { flags = 2 /* Const */; }
+            return ts.createVariableStatement(/*modifiers*/ undefined, ts.createVariableDeclarationList([ts.createVariableDeclaration(name, type, initializer)], flags));
         }
         function createRequireCall(moduleSpecifier) {
-            return ts.createCall(ts.createIdentifier("require"), undefined, [moduleSpecifier]);
+            return ts.createCall(ts.createIdentifier("require"), /*typeArguments*/ undefined, [moduleSpecifier]);
         }
         function addExports(sourceFile, toMove, needExport, useEs6Exports) {
             return ts.flatMap(toMove, function (statement) {
                 if (isTopLevelDeclarationStatement(statement) &&
                     !isExported(sourceFile, statement, useEs6Exports) &&
                     forEachTopLevelDeclaration(statement, function (d) { return needExport.has(ts.Debug.assertDefined(d.symbol)); })) {
-                    var exports_2 = addExport(statement, useEs6Exports);
-                    if (exports_2)
-                        return exports_2;
+                    var exports = addExport(statement, useEs6Exports);
+                    if (exports)
+                        return exports;
                 }
                 return statement;
             });
         }
         function deleteUnusedImports(sourceFile, importDecl, changes, isUnused) {
             switch (importDecl.kind) {
-                case 244:
+                case 244 /* ImportDeclaration */:
                     deleteUnusedImportsInDeclaration(sourceFile, importDecl, changes, isUnused);
                     break;
-                case 243:
+                case 243 /* ImportEqualsDeclaration */:
                     if (isUnused(importDecl.name)) {
                         changes.deleteNode(sourceFile, importDecl);
                     }
                     break;
-                case 232:
+                case 232 /* VariableDeclaration */:
                     deleteUnusedImportsInVariableDeclaration(sourceFile, importDecl, changes, isUnused);
                     break;
                 default:
@@ -89159,7 +107467,7 @@ var ts;
             var _a = importDecl.importClause, name = _a.name, namedBindings = _a.namedBindings;
             var defaultUnused = !name || isUnused(name);
             var namedBindingsUnused = !namedBindings ||
-                (namedBindings.kind === 246 ? isUnused(namedBindings.name) : namedBindings.elements.every(function (e) { return isUnused(e.name); }));
+                (namedBindings.kind === 246 /* NamespaceImport */ ? isUnused(namedBindings.name) : namedBindings.elements.every(function (e) { return isUnused(e.name); }));
             if (defaultUnused && namedBindingsUnused) {
                 changes.deleteNode(sourceFile, importDecl);
             }
@@ -89171,7 +107479,7 @@ var ts;
                     if (namedBindingsUnused) {
                         changes.deleteNode(sourceFile, namedBindings);
                     }
-                    else if (namedBindings.kind === 247) {
+                    else if (namedBindings.kind === 247 /* NamedImports */) {
                         for (var _i = 0, _b = namedBindings.elements; _i < _b.length; _i++) {
                             var element = _b[_i];
                             if (isUnused(element.name))
@@ -89184,14 +107492,14 @@ var ts;
         function deleteUnusedImportsInVariableDeclaration(sourceFile, varDecl, changes, isUnused) {
             var name = varDecl.name;
             switch (name.kind) {
-                case 71:
+                case 71 /* Identifier */:
                     if (isUnused(name)) {
                         changes.deleteNode(sourceFile, name);
                     }
                     break;
-                case 181:
+                case 181 /* ArrayBindingPattern */:
                     break;
-                case 180:
+                case 180 /* ObjectBindingPattern */:
                     if (name.elements.every(function (e) { return ts.isIdentifier(e.name) && isUnused(e.name); })) {
                         changes.deleteNode(sourceFile, ts.isVariableDeclarationList(varDecl.parent) && varDecl.parent.declarations.length === 1 ? varDecl.parent.parent : varDecl);
                     }
@@ -89206,7 +107514,7 @@ var ts;
                     break;
             }
         }
-        function getNewFileImportsAndAddExportInOldFile(oldFile, importsToCopy, newFileImportsFromOldFile, changes, checker, useEs6ModuleSyntax, preferences) {
+        function getNewFileImportsAndAddExportInOldFile(oldFile, importsToCopy, newFileImportsFromOldFile, changes, checker, useEs6ModuleSyntax, quotePreference) {
             var copiedOldImports = [];
             for (var _i = 0, _a = oldFile.statements; _i < _a.length; _i++) {
                 var oldStatement = _a[_i];
@@ -89214,9 +107522,10 @@ var ts;
                     ts.append(copiedOldImports, filterImport(i, moduleSpecifierFromImport(i), function (name) { return importsToCopy.has(checker.getSymbolAtLocation(name)); }));
                 });
             }
+            // Also, import things used from the old file, and insert 'export' modifiers as necessary in the old file.
             var oldFileDefault;
             var oldFileNamedImports = [];
-            var markSeenTop = ts.nodeSeenTracker();
+            var markSeenTop = ts.nodeSeenTracker(); // Needed because multiple declarations may appear in `const x = 0, y = 1;`.
             newFileImportsFromOldFile.forEach(function (symbol) {
                 for (var _i = 0, _a = symbol.declarations; _i < _a.length; _i++) {
                     var decl = _a[_i];
@@ -89229,7 +107538,7 @@ var ts;
                     if (markSeenTop(top)) {
                         addExportToChanges(oldFile, top, changes, useEs6ModuleSyntax);
                     }
-                    if (ts.hasModifier(decl, 512)) {
+                    if (ts.hasModifier(decl, 512 /* Default */)) {
                         oldFileDefault = name;
                     }
                     else {
@@ -89237,7 +107546,7 @@ var ts;
                     }
                 }
             });
-            ts.append(copiedOldImports, makeImportOrRequire(oldFileDefault, oldFileNamedImports, ts.removeFileExtension(ts.getBaseFileName(oldFile.fileName)), useEs6ModuleSyntax, preferences));
+            ts.append(copiedOldImports, makeImportOrRequire(oldFileDefault, oldFileNamedImports, ts.removeFileExtension(ts.getBaseFileName(oldFile.fileName)), useEs6ModuleSyntax, quotePreference));
             return copiedOldImports;
         }
         function makeUniqueModuleName(moduleName, extension, inDirectory, host) {
@@ -89245,7 +107554,7 @@ var ts;
             for (var i = 1;; i++) {
                 var name = ts.combinePaths(inDirectory, newModuleName + extension);
                 if (!host.fileExists(name))
-                    return newModuleName;
+                    return newModuleName; // TODO: GH#18217
                 newModuleName = moduleName + "." + i;
             }
         }
@@ -89292,15 +107601,16 @@ var ts;
             }
             return { movedSymbols: movedSymbols, newFileImportsFromOldFile: newFileImportsFromOldFile, oldFileImportsFromNewFile: oldFileImportsFromNewFile, oldImportsNeededByNewFile: oldImportsNeededByNewFile, unusedImportsFromOldFile: unusedImportsFromOldFile };
         }
+        // Below should all be utilities
         function isInImport(decl) {
             switch (decl.kind) {
-                case 243:
-                case 248:
-                case 245:
+                case 243 /* ImportEqualsDeclaration */:
+                case 248 /* ImportSpecifier */:
+                case 245 /* ImportClause */:
                     return true;
-                case 232:
+                case 232 /* VariableDeclaration */:
                     return isVariableDeclarationInImport(decl);
-                case 182:
+                case 182 /* BindingElement */:
                     return ts.isVariableDeclaration(decl.parent.parent) && isVariableDeclarationInImport(decl.parent.parent);
                 default:
                     return false;
@@ -89308,23 +107618,23 @@ var ts;
         }
         function isVariableDeclarationInImport(decl) {
             return ts.isSourceFile(decl.parent.parent.parent) &&
-                decl.initializer && ts.isRequireCall(decl.initializer, true);
+                decl.initializer && ts.isRequireCall(decl.initializer, /*checkArgumentIsStringLiteralLike*/ true);
         }
         function filterImport(i, moduleSpecifier, keep) {
             switch (i.kind) {
-                case 244: {
+                case 244 /* ImportDeclaration */: {
                     var clause = i.importClause;
                     if (!clause)
                         return undefined;
                     var defaultImport = clause.name && keep(clause.name) ? clause.name : undefined;
                     var namedBindings = clause.namedBindings && filterNamedBindings(clause.namedBindings, keep);
                     return defaultImport || namedBindings
-                        ? ts.createImportDeclaration(undefined, undefined, ts.createImportClause(defaultImport, namedBindings), moduleSpecifier)
+                        ? ts.createImportDeclaration(/*decorators*/ undefined, /*modifiers*/ undefined, ts.createImportClause(defaultImport, namedBindings), moduleSpecifier)
                         : undefined;
                 }
-                case 243:
+                case 243 /* ImportEqualsDeclaration */:
                     return keep(i.name) ? i : undefined;
-                case 232: {
+                case 232 /* VariableDeclaration */: {
                     var name = filterBindingName(i.name, keep);
                     return name ? makeVariableStatement(name, i.type, createRequireCall(moduleSpecifier), i.parent.flags) : undefined;
                 }
@@ -89333,7 +107643,7 @@ var ts;
             }
         }
         function filterNamedBindings(namedBindings, keep) {
-            if (namedBindings.kind === 246) {
+            if (namedBindings.kind === 246 /* NamespaceImport */) {
                 return keep(namedBindings.name) ? namedBindings : undefined;
             }
             else {
@@ -89343,11 +107653,12 @@ var ts;
         }
         function filterBindingName(name, keep) {
             switch (name.kind) {
-                case 71:
+                case 71 /* Identifier */:
                     return keep(name) ? name : undefined;
-                case 181:
+                case 181 /* ArrayBindingPattern */:
                     return name;
-                case 180: {
+                case 180 /* ObjectBindingPattern */: {
+                    // We can't handle nested destructurings or property names well here, so just copy them all.
                     var newElements = name.elements.filter(function (prop) { return prop.propertyName || !ts.isIdentifier(prop.name) || keep(prop.name); });
                     return newElements.length ? ts.createObjectBindingPattern(newElements) : undefined;
                 }
@@ -89365,7 +107676,7 @@ var ts;
                 }
             });
         }
-        var SymbolSet = (function () {
+        var SymbolSet = /** @class */ (function () {
             function SymbolSet() {
                 this.map = ts.createMap();
             }
@@ -89403,13 +107714,13 @@ var ts;
         }
         function isNonVariableTopLevelDeclaration(node) {
             switch (node.kind) {
-                case 234:
-                case 235:
-                case 239:
-                case 238:
-                case 237:
-                case 236:
-                case 243:
+                case 234 /* FunctionDeclaration */:
+                case 235 /* ClassDeclaration */:
+                case 239 /* ModuleDeclaration */:
+                case 238 /* EnumDeclaration */:
+                case 237 /* TypeAliasDeclaration */:
+                case 236 /* InterfaceDeclaration */:
+                case 243 /* ImportEqualsDeclaration */:
                     return true;
                 default:
                     return false;
@@ -89417,26 +107728,26 @@ var ts;
         }
         function forEachTopLevelDeclaration(statement, cb) {
             switch (statement.kind) {
-                case 234:
-                case 235:
-                case 239:
-                case 238:
-                case 237:
-                case 236:
-                case 243:
+                case 234 /* FunctionDeclaration */:
+                case 235 /* ClassDeclaration */:
+                case 239 /* ModuleDeclaration */:
+                case 238 /* EnumDeclaration */:
+                case 237 /* TypeAliasDeclaration */:
+                case 236 /* InterfaceDeclaration */:
+                case 243 /* ImportEqualsDeclaration */:
                     return cb(statement);
-                case 214:
+                case 214 /* VariableStatement */:
                     return ts.forEach(statement.declarationList.declarations, cb);
-                case 216: {
+                case 216 /* ExpressionStatement */: {
                     var expression = statement.expression;
-                    return ts.isBinaryExpression(expression) && ts.getSpecialPropertyAssignmentKind(expression) === 1
+                    return ts.isBinaryExpression(expression) && ts.getSpecialPropertyAssignmentKind(expression) === 1 /* ExportsProperty */
                         ? cb(statement)
                         : undefined;
                 }
             }
         }
         function nameOfTopLevelDeclaration(d) {
-            return d.kind === 216 ? d.expression.left.name : ts.tryCast(d.name, ts.isIdentifier);
+            return d.kind === 216 /* ExpressionStatement */ ? d.expression.left.name : ts.tryCast(d.name, ts.isIdentifier);
         }
         function getTopLevelDeclarationStatement(d) {
             return ts.isVariableDeclaration(d) ? d.parent.parent : d;
@@ -89456,7 +107767,7 @@ var ts;
         }
         function isExported(sourceFile, decl, useEs6Exports) {
             if (useEs6Exports) {
-                return !ts.isExpressionStatement(decl) && ts.hasModifier(decl, 1);
+                return !ts.isExpressionStatement(decl) && ts.hasModifier(decl, 1 /* Export */);
             }
             else {
                 return getNamesToExportInCommonJS(decl).some(function (name) { return sourceFile.symbol.exports.has(ts.escapeLeadingUnderscores(name)); });
@@ -89466,26 +107777,26 @@ var ts;
             return useEs6Exports ? [addEs6Export(decl)] : addCommonjsExport(decl);
         }
         function addEs6Export(d) {
-            var modifiers = ts.concatenate([ts.createModifier(84)], d.modifiers);
+            var modifiers = ts.concatenate([ts.createModifier(84 /* ExportKeyword */)], d.modifiers);
             switch (d.kind) {
-                case 234:
+                case 234 /* FunctionDeclaration */:
                     return ts.updateFunctionDeclaration(d, d.decorators, modifiers, d.asteriskToken, d.name, d.typeParameters, d.parameters, d.type, d.body);
-                case 235:
+                case 235 /* ClassDeclaration */:
                     return ts.updateClassDeclaration(d, d.decorators, modifiers, d.name, d.typeParameters, d.heritageClauses, d.members);
-                case 214:
+                case 214 /* VariableStatement */:
                     return ts.updateVariableStatement(d, modifiers, d.declarationList);
-                case 239:
+                case 239 /* ModuleDeclaration */:
                     return ts.updateModuleDeclaration(d, d.decorators, modifiers, d.name, d.body);
-                case 238:
+                case 238 /* EnumDeclaration */:
                     return ts.updateEnumDeclaration(d, d.decorators, modifiers, d.name, d.members);
-                case 237:
+                case 237 /* TypeAliasDeclaration */:
                     return ts.updateTypeAliasDeclaration(d, d.decorators, modifiers, d.name, d.typeParameters, d.type);
-                case 236:
+                case 236 /* InterfaceDeclaration */:
                     return ts.updateInterfaceDeclaration(d, d.decorators, modifiers, d.name, d.typeParameters, d.heritageClauses, d.members);
-                case 243:
+                case 243 /* ImportEqualsDeclaration */:
                     return ts.updateImportEqualsDeclaration(d, d.decorators, modifiers, d.name, d.moduleReference);
-                case 216:
-                    return ts.Debug.fail();
+                case 216 /* ExpressionStatement */:
+                    return ts.Debug.fail(); // Shouldn't try to add 'export' keyword to `exports.x = ...`
                 default:
                     return ts.Debug.assertNever(d);
             }
@@ -89495,28 +107806,30 @@ var ts;
         }
         function getNamesToExportInCommonJS(decl) {
             switch (decl.kind) {
-                case 234:
-                case 235:
-                    return [decl.name.text];
-                case 214:
+                case 234 /* FunctionDeclaration */:
+                case 235 /* ClassDeclaration */:
+                    return [decl.name.text]; // TODO: GH#18217
+                case 214 /* VariableStatement */:
                     return ts.mapDefined(decl.declarationList.declarations, function (d) { return ts.isIdentifier(d.name) ? d.name.text : undefined; });
-                case 239:
-                case 238:
-                case 237:
-                case 236:
-                case 243:
+                case 239 /* ModuleDeclaration */:
+                case 238 /* EnumDeclaration */:
+                case 237 /* TypeAliasDeclaration */:
+                case 236 /* InterfaceDeclaration */:
+                case 243 /* ImportEqualsDeclaration */:
                     return ts.emptyArray;
-                case 216:
-                    return ts.Debug.fail();
+                case 216 /* ExpressionStatement */:
+                    return ts.Debug.fail(); // Shouldn't try to add 'export' keyword to `exports.x = ...`
                 default:
                     return ts.Debug.assertNever(decl);
             }
         }
+        /** Creates `exports.x = x;` */
         function createExportAssignment(name) {
-            return ts.createExpressionStatement(ts.createBinary(ts.createPropertyAccess(ts.createIdentifier("exports"), ts.createIdentifier(name)), 58, ts.createIdentifier(name)));
+            return ts.createExpressionStatement(ts.createBinary(ts.createPropertyAccess(ts.createIdentifier("exports"), ts.createIdentifier(name)), 58 /* EqualsToken */, ts.createIdentifier(name)));
         }
     })(refactor = ts.refactor || (ts.refactor = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var sourcemaps;
@@ -89539,12 +107852,13 @@ var ts;
                     return loc;
                 var targetIndex = ts.binarySearch(maps, { sourcePath: loc.fileName, sourcePosition: loc.position }, ts.identity, compareProcessedPositionSourcePositions);
                 if (targetIndex < 0 && maps.length > 0) {
+                    // if no exact match, closest is 2's compliment of result
                     targetIndex = ~targetIndex;
                 }
                 if (!maps[targetIndex] || ts.comparePaths(loc.fileName, maps[targetIndex].sourcePath, sourceRoot) !== 0) {
                     return loc;
                 }
-                return { fileName: ts.toPath(map.file, sourceRoot, host.getCanonicalFileName), position: maps[targetIndex].emittedPosition };
+                return { fileName: ts.toPath(map.file, sourceRoot, host.getCanonicalFileName), position: maps[targetIndex].emittedPosition }; // Closest pos
             }
             function getOriginalPosition(loc) {
                 var maps = getSourceOrderedMappings();
@@ -89552,13 +107866,16 @@ var ts;
                     return loc;
                 var targetIndex = ts.binarySearch(maps, { emittedPosition: loc.position }, ts.identity, compareProcessedPositionEmittedPositions);
                 if (targetIndex < 0 && maps.length > 0) {
+                    // if no exact match, closest is 2's compliment of result
                     targetIndex = ~targetIndex;
                 }
-                return { fileName: ts.toPath(maps[targetIndex].sourcePath, sourceRoot, host.getCanonicalFileName), position: maps[targetIndex].sourcePosition };
+                return { fileName: ts.toPath(maps[targetIndex].sourcePath, sourceRoot, host.getCanonicalFileName), position: maps[targetIndex].sourcePosition }; // Closest pos
             }
             function getSourceFileLike(fileName, location) {
+                // Lookup file in program, if provided
                 var file = program && program.getSourceFile(fileName);
                 if (!file) {
+                    // Otherwise check the cache (which may hit disk)
                     var path = ts.toPath(fileName, location, host.getCanonicalFileName);
                     return fallbackCache.get(path);
                 }
@@ -89626,54 +107943,76 @@ var ts;
         function decodeSinglePosition(state) {
             while (state.decodingIndex < state.encodedText.length) {
                 var char = state.encodedText.charCodeAt(state.decodingIndex);
-                if (char === 59) {
+                if (char === 59 /* semicolon */) {
+                    // New line
                     state.currentEmittedLine++;
                     state.currentEmittedColumn = 0;
                     state.decodingIndex++;
                     continue;
                 }
-                if (char === 44) {
+                if (char === 44 /* comma */) {
+                    // Next entry is on same line - no action needed
                     state.decodingIndex++;
                     continue;
                 }
+                // Read the current position
+                // 1. Column offset from prev read jsColumn
                 state.currentEmittedColumn += base64VLQFormatDecode();
+                // Incorrect emittedColumn dont support this map
                 if (createErrorIfCondition(state.currentEmittedColumn < 0, "Invalid emittedColumn found")) {
                     return;
                 }
+                // Dont support reading mappings that dont have information about original source and its line numbers
                 if (createErrorIfCondition(isSourceMappingSegmentEnd(state.encodedText, state.decodingIndex), "Unsupported Error Format: No entries after emitted column")) {
                     return;
                 }
+                // 2. Relative sourceIndex
                 state.currentSourceIndex += base64VLQFormatDecode();
+                // Incorrect sourceIndex dont support this map
                 if (createErrorIfCondition(state.currentSourceIndex < 0, "Invalid sourceIndex found")) {
                     return;
                 }
+                // Dont support reading mappings that dont have information about original source position
                 if (createErrorIfCondition(isSourceMappingSegmentEnd(state.encodedText, state.decodingIndex), "Unsupported Error Format: No entries after sourceIndex")) {
                     return;
                 }
+                // 3. Relative sourceLine 0 based
                 state.currentSourceLine += base64VLQFormatDecode();
+                // Incorrect sourceLine dont support this map
                 if (createErrorIfCondition(state.currentSourceLine < 0, "Invalid sourceLine found")) {
                     return;
                 }
+                // Dont support reading mappings that dont have information about original source and its line numbers
                 if (createErrorIfCondition(isSourceMappingSegmentEnd(state.encodedText, state.decodingIndex), "Unsupported Error Format: No entries after emitted Line")) {
                     return;
                 }
+                // 4. Relative sourceColumn 0 based
                 state.currentSourceColumn += base64VLQFormatDecode();
+                // Incorrect sourceColumn dont support this map
                 if (createErrorIfCondition(state.currentSourceColumn < 0, "Invalid sourceLine found")) {
                     return;
                 }
+                // 5. Check if there is name:
                 if (!isSourceMappingSegmentEnd(state.encodedText, state.decodingIndex)) {
                     if (state.currentNameIndex === undefined) {
                         state.currentNameIndex = 0;
                     }
                     state.currentNameIndex += base64VLQFormatDecode();
+                    // Incorrect nameIndex dont support this map
+                    // TODO: If we start using `name`s, issue errors when they aren't correct in the sourcemap
+                    // if (createErrorIfCondition(state.currentNameIndex < 0 || state.currentNameIndex >= state.sourceMapNamesLength, "Invalid name index for the source map entry")) {
+                    //    return;
+                    // }
                 }
+                // Dont support reading mappings that dont have information about original source and its line numbers
                 if (createErrorIfCondition(!isSourceMappingSegmentEnd(state.encodedText, state.decodingIndex), "Unsupported Error Format: There are more entries after " + (state.currentNameIndex === undefined ? "sourceColumn" : "nameIndex"))) {
                     return;
                 }
+                // Entry should be complete
                 capturePosition();
                 return;
             }
-            createErrorIfCondition(true, "No encoded entry found");
+            createErrorIfCondition(/*condition*/ true, "No encoded entry found");
             return;
             function capturePosition() {
                 state.positions.push(state.processPosition({
@@ -89687,6 +108026,7 @@ var ts;
             }
             function createErrorIfCondition(condition, errormsg) {
                 if (state.error) {
+                    // An error was already reported
                     return true;
                 }
                 if (condition) {
@@ -89700,17 +108040,23 @@ var ts;
                 var value = 0;
                 for (; moreDigits; state.decodingIndex++) {
                     if (createErrorIfCondition(state.decodingIndex >= state.encodedText.length, "Error in decoding base64VLQFormatDecode, past the mapping string")) {
-                        return undefined;
+                        return undefined; // TODO: GH#18217
                     }
+                    // 6 digit number
                     var currentByte = base64FormatDecode(state.encodedText.charAt(state.decodingIndex));
+                    // If msb is set, we still have more bits to continue
                     moreDigits = (currentByte & 32) !== 0;
+                    // least significant 5 bits are the next msbs in the final value.
                     value = value | ((currentByte & 31) << shiftCount);
                     shiftCount += 5;
                 }
+                // Least significant bit if 1 represents negative and rest of the msb is actual absolute value
                 if ((value & 1) === 0) {
+                    // + number
                     value = value >> 1;
                 }
                 else {
+                    // - number
                     value = value >> 1;
                     value = -value;
                 }
@@ -89722,32 +108068,34 @@ var ts;
         }
         function isSourceMappingSegmentEnd(encodedText, pos) {
             return (pos === encodedText.length ||
-                encodedText.charCodeAt(pos) === 44 ||
-                encodedText.charCodeAt(pos) === 59);
+                encodedText.charCodeAt(pos) === 44 /* comma */ ||
+                encodedText.charCodeAt(pos) === 59 /* semicolon */);
         }
     })(sourcemaps = ts.sourcemaps || (ts.sourcemaps = {}));
 })(ts || (ts = {}));
 var ts;
 (function (ts) {
+    /** The version of the language service API */
     ts.servicesVersion = "0.8";
     function createNode(kind, pos, end, parent) {
         var node = ts.isNodeKind(kind) ? new NodeObject(kind, pos, end) :
-            kind === 71 ? new IdentifierObject(71, pos, end) :
+            kind === 71 /* Identifier */ ? new IdentifierObject(71 /* Identifier */, pos, end) :
                 new TokenObject(kind, pos, end);
         node.parent = parent;
-        node.flags = parent.flags & 12679168;
+        node.flags = parent.flags & 12679168 /* ContextFlags */;
         return node;
     }
-    var NodeObject = (function () {
+    var NodeObject = /** @class */ (function () {
         function NodeObject(kind, pos, end) {
             this.pos = pos;
             this.end = end;
-            this.flags = 0;
-            this.transformFlags = undefined;
+            this.flags = 0 /* None */;
+            this.transformFlags = undefined; // TODO: GH#18217
             this.parent = undefined;
             this.kind = kind;
         }
         NodeObject.prototype.assertHasRealPosition = function (message) {
+            // tslint:disable-next-line:debug-assert
             ts.Debug.assert(!ts.positionIsSynthesized(this.pos) && !ts.positionIsSynthesized(this.end), message || "Node must have a real position for this operation");
         };
         NodeObject.prototype.getSourceFile = function () {
@@ -89804,8 +108152,8 @@ var ts;
             if (!children.length) {
                 return undefined;
             }
-            var child = ts.find(children, function (kid) { return kid.kind < 278 || kid.kind > 298; });
-            return child.kind < 146 ?
+            var child = ts.find(children, function (kid) { return kid.kind < 278 /* FirstJSDocNode */ || kid.kind > 298 /* LastJSDocNode */; });
+            return child.kind < 146 /* FirstNode */ ?
                 child :
                 child.getFirstToken(sourceFile);
         };
@@ -89816,7 +108164,7 @@ var ts;
             if (!child) {
                 return undefined;
             }
-            return child.kind < 146 ? child : child.getLastToken(sourceFile);
+            return child.kind < 146 /* FirstNode */ ? child : child.getLastToken(sourceFile);
         };
         NodeObject.prototype.forEachChild = function (cbNode, cbNodeArray) {
             return ts.forEachChild(this, cbNode, cbNodeArray);
@@ -89829,6 +108177,7 @@ var ts;
         }
         var children = [];
         if (ts.isJSDocCommentContainingNode(node)) {
+            /** Don't add trivia for "tokens" since this is in a comment. */
             node.forEachChild(function (child) { children.push(child); });
             return children;
         }
@@ -89844,7 +108193,11 @@ var ts;
             children.push(createSyntaxList(nodes, node));
             pos = nodes.end;
         };
+        // jsDocComments need to be the first children
         ts.forEach(node.jsDoc, processNode);
+        // For syntactic classifications, all trivia are classified together, including jsdoc comments.
+        // For that to work, the jsdoc comments should still be the leading trivia of the first child.
+        // Restoring the scanner position ensures that.
         pos = node.pos;
         node.forEachChild(processNode, processNodes);
         addSyntheticNodes(children, pos, node.end, node);
@@ -89857,23 +108210,23 @@ var ts;
             var token = ts.scanner.scan();
             var textPos = ts.scanner.getTextPos();
             if (textPos <= end) {
-                if (token === 71) {
+                if (token === 71 /* Identifier */) {
                     ts.Debug.fail("Did not expect " + ts.Debug.showSyntaxKind(parent) + " to have an Identifier in its trivia");
                 }
                 nodes.push(createNode(token, pos, textPos, parent));
             }
             pos = textPos;
-            if (token === 1) {
+            if (token === 1 /* EndOfFileToken */) {
                 break;
             }
         }
     }
     function createSyntaxList(nodes, parent) {
-        var list = createNode(299, nodes.pos, nodes.end, parent);
+        var list = createNode(299 /* SyntaxList */, nodes.pos, nodes.end, parent);
         list._children = [];
         var pos = nodes.pos;
-        for (var _i = 0, nodes_7 = nodes; _i < nodes_7.length; _i++) {
-            var node = nodes_7[_i];
+        for (var _i = 0, nodes_1 = nodes; _i < nodes_1.length; _i++) {
+            var node = nodes_1[_i];
             addSyntheticNodes(list._children, pos, node.pos, parent);
             list._children.push(node);
             pos = node.end;
@@ -89881,11 +108234,12 @@ var ts;
         addSyntheticNodes(list._children, pos, nodes.end, parent);
         return list;
     }
-    var TokenOrIdentifierObject = (function () {
+    var TokenOrIdentifierObject = /** @class */ (function () {
         function TokenOrIdentifierObject(pos, end) {
+            // Set properties in same order as NodeObject
             this.pos = pos;
             this.end = end;
-            this.flags = 0;
+            this.flags = 0 /* None */;
             this.parent = undefined;
         }
         TokenOrIdentifierObject.prototype.getSourceFile = function () {
@@ -89922,7 +108276,7 @@ var ts;
             return 0;
         };
         TokenOrIdentifierObject.prototype.getChildAt = function () {
-            return undefined;
+            return undefined; // TODO: GH#18217
         };
         TokenOrIdentifierObject.prototype.getChildren = function () {
             return ts.emptyArray;
@@ -89938,7 +108292,7 @@ var ts;
         };
         return TokenOrIdentifierObject;
     }());
-    var SymbolObject = (function () {
+    var SymbolObject = /** @class */ (function () {
         function SymbolObject(flags, name) {
             this.flags = flags;
             this.escapedName = name;
@@ -89964,7 +108318,7 @@ var ts;
         };
         SymbolObject.prototype.getDocumentationComment = function (checker) {
             if (!this.documentationComment) {
-                this.documentationComment = ts.emptyArray;
+                this.documentationComment = ts.emptyArray; // Set temporarily to avoid an infinite loop finding inherited docs
                 this.documentationComment = getDocumentationComment(this.declarations, checker);
             }
             return this.documentationComment;
@@ -89977,7 +108331,7 @@ var ts;
         };
         return SymbolObject;
     }());
-    var TokenObject = (function (_super) {
+    var TokenObject = /** @class */ (function (_super) {
         __extends(TokenObject, _super);
         function TokenObject(kind, pos, end) {
             var _this = _super.call(this, pos, end) || this;
@@ -89986,7 +108340,7 @@ var ts;
         }
         return TokenObject;
     }(TokenOrIdentifierObject));
-    var IdentifierObject = (function (_super) {
+    var IdentifierObject = /** @class */ (function (_super) {
         __extends(IdentifierObject, _super);
         function IdentifierObject(_kind, pos, end) {
             return _super.call(this, pos, end) || this;
@@ -90000,8 +108354,8 @@ var ts;
         });
         return IdentifierObject;
     }(TokenOrIdentifierObject));
-    IdentifierObject.prototype.kind = 71;
-    var TypeObject = (function () {
+    IdentifierObject.prototype.kind = 71 /* Identifier */;
+    var TypeObject = /** @class */ (function () {
         function TypeObject(checker, flags) {
             this.checker = checker;
             this.flags = flags;
@@ -90022,16 +108376,16 @@ var ts;
             return this.checker.getAugmentedPropertiesOfType(this);
         };
         TypeObject.prototype.getCallSignatures = function () {
-            return this.checker.getSignaturesOfType(this, 0);
+            return this.checker.getSignaturesOfType(this, 0 /* Call */);
         };
         TypeObject.prototype.getConstructSignatures = function () {
-            return this.checker.getSignaturesOfType(this, 1);
+            return this.checker.getSignaturesOfType(this, 1 /* Construct */);
         };
         TypeObject.prototype.getStringIndexType = function () {
-            return this.checker.getIndexTypeOfType(this, 0);
+            return this.checker.getIndexTypeOfType(this, 0 /* String */);
         };
         TypeObject.prototype.getNumberIndexType = function () {
-            return this.checker.getIndexTypeOfType(this, 1);
+            return this.checker.getIndexTypeOfType(this, 1 /* Number */);
         };
         TypeObject.prototype.getBaseTypes = function () {
             return this.isClassOrInterface() ? this.checker.getBaseTypes(this) : undefined;
@@ -90046,35 +108400,35 @@ var ts;
             return this.checker.getDefaultFromTypeParameter(this);
         };
         TypeObject.prototype.isUnion = function () {
-            return !!(this.flags & 262144);
+            return !!(this.flags & 262144 /* Union */);
         };
         TypeObject.prototype.isIntersection = function () {
-            return !!(this.flags & 524288);
+            return !!(this.flags & 524288 /* Intersection */);
         };
         TypeObject.prototype.isUnionOrIntersection = function () {
-            return !!(this.flags & 786432);
+            return !!(this.flags & 786432 /* UnionOrIntersection */);
         };
         TypeObject.prototype.isLiteral = function () {
-            return !!(this.flags & 448);
+            return !!(this.flags & 192 /* StringOrNumberLiteral */);
         };
         TypeObject.prototype.isStringLiteral = function () {
-            return !!(this.flags & 64);
+            return !!(this.flags & 64 /* StringLiteral */);
         };
         TypeObject.prototype.isNumberLiteral = function () {
-            return !!(this.flags & 128);
+            return !!(this.flags & 128 /* NumberLiteral */);
         };
         TypeObject.prototype.isTypeParameter = function () {
-            return !!(this.flags & 65536);
+            return !!(this.flags & 65536 /* TypeParameter */);
         };
         TypeObject.prototype.isClassOrInterface = function () {
-            return !!(ts.getObjectFlags(this) & 3);
+            return !!(ts.getObjectFlags(this) & 3 /* ClassOrInterface */);
         };
         TypeObject.prototype.isClass = function () {
-            return !!(ts.getObjectFlags(this) & 1);
+            return !!(ts.getObjectFlags(this) & 1 /* Class */);
         };
         return TypeObject;
     }());
-    var SignatureObject = (function () {
+    var SignatureObject = /** @class */ (function () {
         function SignatureObject(checker) {
             this.checker = checker;
         }
@@ -90101,6 +108455,11 @@ var ts;
         };
         return SignatureObject;
     }());
+    /**
+     * Returns whether or not the given node has a JSDoc "inheritDoc" tag on it.
+     * @param node the Node in question.
+     * @returns `true` if `node` has a JSDoc "inheritDoc" tag on it, otherwise `false`.
+     */
     function hasJSDocInheritDocTag(node) {
         return ts.getJSDocTags(node).some(function (tag) { return tag.tagName.text === "inheritDoc"; });
     }
@@ -90109,15 +108468,24 @@ var ts;
             return ts.emptyArray;
         var doc = ts.JsDoc.getJsDocCommentsFromDeclarations(declarations);
         if (doc.length === 0 || declarations.some(hasJSDocInheritDocTag)) {
-            for (var _i = 0, declarations_14 = declarations; _i < declarations_14.length; _i++) {
-                var declaration = declarations_14[_i];
-                var inheritedDocs = findInheritedJSDocComments(declaration, declaration.symbol.name, checker);
+            for (var _i = 0, declarations_5 = declarations; _i < declarations_5.length; _i++) {
+                var declaration = declarations_5[_i];
+                var inheritedDocs = findInheritedJSDocComments(declaration, declaration.symbol.name, checker); // TODO: GH#18217
+                // TODO: GH#16312 Return a ReadonlyArray, avoid copying inheritedDocs
                 if (inheritedDocs)
                     doc = doc.length === 0 ? inheritedDocs.slice() : inheritedDocs.concat(ts.lineBreakPart(), doc);
             }
         }
         return doc;
     }
+    /**
+     * Attempts to find JSDoc comments for possibly-inherited properties.  Checks superclasses then traverses
+     * implemented interfaces until a symbol is found with the same name and with documentation.
+     * @param declaration The possibly-inherited declaration to find comments for.
+     * @param propertyName The name of the possibly-inherited property.
+     * @param typeChecker A TypeChecker, used to find inherited properties.
+     * @returns A filled array of documentation comments if any were found, otherwise an empty array.
+     */
     function findInheritedJSDocComments(declaration, propertyName, typeChecker) {
         return ts.firstDefined(declaration.parent ? ts.getAllSuperTypeNodes(declaration.parent) : ts.emptyArray, function (superTypeNode) {
             var superType = typeChecker.getTypeAtLocation(superTypeNode);
@@ -90126,7 +108494,7 @@ var ts;
             return inheritedDocs && inheritedDocs.length ? inheritedDocs : undefined;
         });
     }
-    var SourceFileObject = (function (_super) {
+    var SourceFileObject = /** @class */ (function (_super) {
         __extends(SourceFileObject, _super);
         function SourceFileObject(kind, pos, end) {
             return _super.call(this, kind, pos, end) || this;
@@ -90154,6 +108522,7 @@ var ts;
                 lastCharPos = lineStarts[line + 1] - 1;
             }
             var fullText = this.getFullText();
+            // if the new line is "\r\n", we should return the last non-new-line-character position
             return fullText[lastCharPos] === "\n" && fullText[lastCharPos - 1] === "\r" ? lastCharPos - 1 : lastCharPos;
         };
         SourceFileObject.prototype.getNamedDeclarations = function () {
@@ -90186,16 +108555,19 @@ var ts;
             }
             function visit(node) {
                 switch (node.kind) {
-                    case 234:
-                    case 192:
-                    case 154:
-                    case 153:
+                    case 234 /* FunctionDeclaration */:
+                    case 192 /* FunctionExpression */:
+                    case 154 /* MethodDeclaration */:
+                    case 153 /* MethodSignature */:
                         var functionDeclaration = node;
                         var declarationName = getDeclarationName(functionDeclaration);
                         if (declarationName) {
                             var declarations = getDeclarations(declarationName);
                             var lastDeclaration = ts.lastOrUndefined(declarations);
+                            // Check whether this declaration belongs to an "overload group".
                             if (lastDeclaration && functionDeclaration.parent === lastDeclaration.parent && functionDeclaration.symbol === lastDeclaration.symbol) {
+                                // Overwrite the last declaration if it was an overload
+                                // and this one is an implementation.
                                 if (functionDeclaration.body && !lastDeclaration.body) {
                                     declarations[declarations.length - 1] = functionDeclaration;
                                 }
@@ -90206,29 +108578,31 @@ var ts;
                         }
                         ts.forEachChild(node, visit);
                         break;
-                    case 235:
-                    case 205:
-                    case 236:
-                    case 237:
-                    case 238:
-                    case 239:
-                    case 243:
-                    case 252:
-                    case 248:
-                    case 245:
-                    case 246:
-                    case 156:
-                    case 157:
-                    case 166:
+                    case 235 /* ClassDeclaration */:
+                    case 205 /* ClassExpression */:
+                    case 236 /* InterfaceDeclaration */:
+                    case 237 /* TypeAliasDeclaration */:
+                    case 238 /* EnumDeclaration */:
+                    case 239 /* ModuleDeclaration */:
+                    case 243 /* ImportEqualsDeclaration */:
+                    case 252 /* ExportSpecifier */:
+                    case 248 /* ImportSpecifier */:
+                    case 245 /* ImportClause */:
+                    case 246 /* NamespaceImport */:
+                    case 156 /* GetAccessor */:
+                    case 157 /* SetAccessor */:
+                    case 166 /* TypeLiteral */:
                         addDeclaration(node);
                         ts.forEachChild(node, visit);
                         break;
-                    case 149:
-                        if (!ts.hasModifier(node, 92)) {
+                    case 149 /* Parameter */:
+                        // Only consider parameter properties
+                        if (!ts.hasModifier(node, 92 /* ParameterPropertyModifier */)) {
                             break;
                         }
-                    case 232:
-                    case 182: {
+                    // falls through
+                    case 232 /* VariableDeclaration */:
+                    case 182 /* BindingElement */: {
                         var decl = node;
                         if (ts.isBindingPattern(decl.name)) {
                             ts.forEachChild(decl.name, visit);
@@ -90238,24 +108612,32 @@ var ts;
                             visit(decl.initializer);
                         }
                     }
-                    case 273:
-                    case 152:
-                    case 151:
+                    // falls through
+                    case 273 /* EnumMember */:
+                    case 152 /* PropertyDeclaration */:
+                    case 151 /* PropertySignature */:
                         addDeclaration(node);
                         break;
-                    case 250:
+                    case 250 /* ExportDeclaration */:
+                        // Handle named exports case e.g.:
+                        //    export {a, b as B} from "mod";
                         if (node.exportClause) {
                             ts.forEach(node.exportClause.elements, visit);
                         }
                         break;
-                    case 244:
+                    case 244 /* ImportDeclaration */:
                         var importClause = node.importClause;
                         if (importClause) {
+                            // Handle default import case e.g.:
+                            //    import d from "mod";
                             if (importClause.name) {
                                 addDeclaration(importClause);
                             }
+                            // Handle named bindings in imports e.g.:
+                            //    import * as NS from "mod";
+                            //    import {a, b as B} from "mod";
                             if (importClause.namedBindings) {
-                                if (importClause.namedBindings.kind === 246) {
+                                if (importClause.namedBindings.kind === 246 /* NamespaceImport */) {
                                     addDeclaration(importClause.namedBindings);
                                 }
                                 else {
@@ -90264,10 +108646,11 @@ var ts;
                             }
                         }
                         break;
-                    case 200:
-                        if (ts.getSpecialPropertyAssignmentKind(node) !== 0) {
+                    case 200 /* BinaryExpression */:
+                        if (ts.getSpecialPropertyAssignmentKind(node) !== 0 /* None */) {
                             addDeclaration(node);
                         }
+                    // falls through
                     default:
                         ts.forEachChild(node, visit);
                 }
@@ -90275,7 +108658,7 @@ var ts;
         };
         return SourceFileObject;
     }(NodeObject));
-    var SourceMapSourceObject = (function () {
+    var SourceMapSourceObject = /** @class */ (function () {
         function SourceMapSourceObject(fileName, text, skipTrivia) {
             this.fileName = fileName;
             this.text = text;
@@ -90330,9 +108713,10 @@ var ts;
     }
     ts.displayPartsToString = displayPartsToString;
     function getDefaultCompilerOptions() {
+        // Always default to "ScriptTarget.ES5" for the language service
         return {
-            target: 1,
-            jsx: 1
+            target: 1 /* ES5 */,
+            jsx: 1 /* Preserve */
         };
     }
     ts.getDefaultCompilerOptions = getDefaultCompilerOptions;
@@ -90340,16 +108724,22 @@ var ts;
         return ts.codefix.getSupportedErrorCodes();
     }
     ts.getSupportedCodeFixes = getSupportedCodeFixes;
-    var HostCache = (function () {
+    // Cache host information about script Should be refreshed
+    // at each language service public entry point, since we don't know when
+    // the set of scripts handled by the host changes.
+    var HostCache = /** @class */ (function () {
         function HostCache(host, getCanonicalFileName) {
             this.host = host;
+            // script id => script index
             this.currentDirectory = host.getCurrentDirectory();
             this.fileNameToEntry = ts.createMap();
+            // Initialize the list with the root file names
             var rootFileNames = host.getScriptFileNames();
             for (var _i = 0, rootFileNames_1 = rootFileNames; _i < rootFileNames_1.length; _i++) {
                 var fileName = rootFileNames_1[_i];
                 this.createEntry(fileName, ts.toPath(fileName, this.currentDirectory, getCanonicalFileName));
             }
+            // store the compilation settings
             this._compilationSettings = host.getCompilationSettings() || getDefaultCompilerOptions();
         }
         HostCache.prototype.compilationSettings = function () {
@@ -90384,7 +108774,7 @@ var ts;
         };
         HostCache.prototype.getOrCreateEntryByPath = function (fileName, path) {
             var info = this.getEntryByPath(path) || this.createEntry(fileName, path);
-            return ts.isString(info) ? undefined : info;
+            return ts.isString(info) ? undefined : info; // TODO: GH#18217
         };
         HostCache.prototype.getRootFileNames = function () {
             var names = [];
@@ -90393,7 +108783,7 @@ var ts;
                     names.push(entry);
                 }
                 else {
-                    if (entry.scriptKind !== 6) {
+                    if (entry.scriptKind !== 6 /* JSON */) {
                         names.push(entry.hostFileName);
                     }
                 }
@@ -90402,34 +108792,38 @@ var ts;
         };
         HostCache.prototype.getVersion = function (path) {
             var file = this.getHostFileInformation(path);
-            return (file && file.version);
+            return (file && file.version); // TODO: GH#18217
         };
         HostCache.prototype.getScriptSnapshot = function (path) {
             var file = this.getHostFileInformation(path);
-            return (file && file.scriptSnapshot);
+            return (file && file.scriptSnapshot); // TODO: GH#18217
         };
         return HostCache;
     }());
-    var SyntaxTreeCache = (function () {
+    var SyntaxTreeCache = /** @class */ (function () {
         function SyntaxTreeCache(host) {
             this.host = host;
         }
         SyntaxTreeCache.prototype.getCurrentSourceFile = function (fileName) {
             var scriptSnapshot = this.host.getScriptSnapshot(fileName);
             if (!scriptSnapshot) {
+                // The host does not know about this file.
                 throw new Error("Could not find file: '" + fileName + "'.");
             }
             var scriptKind = ts.getScriptKind(fileName, this.host);
             var version = this.host.getScriptVersion(fileName);
             var sourceFile;
             if (this.currentFileName !== fileName) {
-                sourceFile = createLanguageServiceSourceFile(fileName, scriptSnapshot, 6, version, true, scriptKind);
+                // This is a new file, just parse it
+                sourceFile = createLanguageServiceSourceFile(fileName, scriptSnapshot, 6 /* Latest */, version, /*setNodeParents*/ true, scriptKind);
             }
             else if (this.currentFileVersion !== version) {
+                // This is the same file, just a newer version. Incrementally parse the file.
                 var editRange = scriptSnapshot.getChangeRange(this.currentFileScriptSnapshot);
                 sourceFile = updateLanguageServiceSourceFile(this.currentSourceFile, scriptSnapshot, version, editRange);
             }
             if (sourceFile) {
+                // All done, ensure state is up to date
                 this.currentFileVersion = version;
                 this.currentFileName = fileName;
                 this.currentFileScriptSnapshot = scriptSnapshot;
@@ -90451,21 +108845,29 @@ var ts;
     ts.createLanguageServiceSourceFile = createLanguageServiceSourceFile;
     ts.disableIncrementalParsing = false;
     function updateLanguageServiceSourceFile(sourceFile, scriptSnapshot, version, textChangeRange, aggressiveChecks) {
+        // If we were given a text change range, and our version or open-ness changed, then
+        // incrementally parse this file.
         if (textChangeRange) {
             if (version !== sourceFile.version) {
+                // Once incremental parsing is ready, then just call into this function.
                 if (!ts.disableIncrementalParsing) {
                     var newText = void 0;
+                    // grab the fragment from the beginning of the original text to the beginning of the span
                     var prefix = textChangeRange.span.start !== 0
                         ? sourceFile.text.substr(0, textChangeRange.span.start)
                         : "";
+                    // grab the fragment from the end of the span till the end of the original text
                     var suffix = ts.textSpanEnd(textChangeRange.span) !== sourceFile.text.length
                         ? sourceFile.text.substr(ts.textSpanEnd(textChangeRange.span))
                         : "";
                     if (textChangeRange.newLength === 0) {
+                        // edit was a deletion - just combine prefix and suffix
                         newText = prefix && suffix ? prefix + suffix : prefix || suffix;
                     }
                     else {
+                        // it was actual edit, fetch the fragment of new text that correspond to new span
                         var changedText = scriptSnapshot.getText(textChangeRange.span.start, textChangeRange.span.start + textChangeRange.newLength);
+                        // combine prefix, changed text and suffix
                         newText = prefix && suffix
                             ? prefix + changedText + suffix
                             : prefix
@@ -90474,7 +108876,10 @@ var ts;
                     }
                     var newSourceFile = ts.updateSourceFile(sourceFile, newText, textChangeRange, aggressiveChecks);
                     setSourceFileFields(newSourceFile, scriptSnapshot, version);
+                    // after incremental parsing nameTable might not be up-to-date
+                    // drop it so it can be lazily recreated later
                     newSourceFile.nameTable = undefined;
+                    // dispose all resources held by old script snapshot
                     if (sourceFile !== newSourceFile && sourceFile.scriptSnapshot) {
                         if (sourceFile.scriptSnapshot.dispose) {
                             sourceFile.scriptSnapshot.dispose();
@@ -90485,10 +108890,11 @@ var ts;
                 }
             }
         }
-        return createLanguageServiceSourceFile(sourceFile.fileName, scriptSnapshot, sourceFile.languageVersion, version, true, sourceFile.scriptKind);
+        // Otherwise, just create a new source file.
+        return createLanguageServiceSourceFile(sourceFile.fileName, scriptSnapshot, sourceFile.languageVersion, version, /*setNodeParents*/ true, sourceFile.scriptKind);
     }
     ts.updateLanguageServiceSourceFile = updateLanguageServiceSourceFile;
-    var CancellationTokenObject = (function () {
+    var CancellationTokenObject = /** @class */ (function () {
         function CancellationTokenObject(cancellationToken) {
             this.cancellationToken = cancellationToken;
         }
@@ -90502,17 +108908,23 @@ var ts;
         };
         return CancellationTokenObject;
     }());
-    var ThrottledCancellationToken = (function () {
+    /* @internal */
+    /** A cancellation that throttles calls to the host */
+    var ThrottledCancellationToken = /** @class */ (function () {
         function ThrottledCancellationToken(hostCancellationToken, throttleWaitMilliseconds) {
             if (throttleWaitMilliseconds === void 0) { throttleWaitMilliseconds = 20; }
             this.hostCancellationToken = hostCancellationToken;
             this.throttleWaitMilliseconds = throttleWaitMilliseconds;
+            // Store when we last tried to cancel.  Checking cancellation can be expensive (as we have
+            // to marshall over to the host layer).  So we only bother actually checking once enough
+            // time has passed.
             this.lastCancellationCheckTime = 0;
         }
         ThrottledCancellationToken.prototype.isCancellationRequested = function () {
             var time = ts.timestamp();
             var duration = Math.abs(time - this.lastCancellationCheckTime);
             if (duration >= this.throttleWaitMilliseconds) {
+                // Check no more than once every throttle wait milliseconds
                 this.lastCancellationCheckTime = time;
                 return this.hostCancellationToken.isCancellationRequested();
             }
@@ -90526,6 +108938,7 @@ var ts;
         return ThrottledCancellationToken;
     }());
     ts.ThrottledCancellationToken = ThrottledCancellationToken;
+    /* @internal */
     function createSourceFileLikeCache(host) {
         var cached = ts.createMap();
         return {
@@ -90535,7 +108948,8 @@ var ts;
                 }
                 if (!host.fileExists || !host.readFile || !host.fileExists(path))
                     return;
-                var text = host.readFile(path);
+                // And failing that, check the disk
+                var text = host.readFile(path); // TODO: GH#18217
                 var file = {
                     text: text,
                     lineMap: undefined,
@@ -90550,15 +108964,16 @@ var ts;
     }
     ts.createSourceFileLikeCache = createSourceFileLikeCache;
     function createLanguageService(host, documentRegistry, syntaxOnly) {
-        var _a;
         if (documentRegistry === void 0) { documentRegistry = ts.createDocumentRegistry(host.useCaseSensitiveFileNames && host.useCaseSensitiveFileNames(), host.getCurrentDirectory()); }
         if (syntaxOnly === void 0) { syntaxOnly = false; }
+        var _a;
         var syntaxTreeCache = new SyntaxTreeCache(host);
         var program;
         var lastProjectVersion;
         var lastTypesRootVersion = 0;
         var cancellationToken = new CancellationTokenObject(host.getCancellationToken && host.getCancellationToken());
         var currentDirectory = host.getCurrentDirectory();
+        // Check if the localized messages json is set, otherwise query the host for it
         if (!ts.localizedDiagnosticMessages && host.getLocalizedDiagnosticMessages) {
             ts.localizedDiagnosticMessages = host.getLocalizedDiagnosticMessages();
         }
@@ -90579,6 +108994,7 @@ var ts;
         }
         function synchronizeHostData() {
             ts.Debug.assert(!syntaxOnly);
+            // perform fast check if host supports it
             if (host.getProjectVersion) {
                 var hostProjectVersion = host.getProjectVersion();
                 if (hostProjectVersion) {
@@ -90591,16 +109007,24 @@ var ts;
             var typeRootsVersion = host.getTypeRootsVersion ? host.getTypeRootsVersion() : 0;
             if (lastTypesRootVersion !== typeRootsVersion) {
                 log("TypeRoots version has changed; provide new program");
-                program = undefined;
+                program = undefined; // TODO: GH#18217
                 lastTypesRootVersion = typeRootsVersion;
             }
+            // Get a fresh cache of the host information
             var hostCache = new HostCache(host, getCanonicalFileName);
             var rootFileNames = hostCache.getRootFileNames();
             var hasInvalidatedResolution = host.hasInvalidatedResolution || ts.returnFalse;
+            // If the program is already up-to-date, we can reuse it
             if (ts.isProgramUptoDate(program, rootFileNames, hostCache.compilationSettings(), function (path) { return hostCache.getVersion(path); }, fileExists, hasInvalidatedResolution, !!host.hasChangedAutomaticTypeDirectiveNames)) {
                 return;
             }
+            // IMPORTANT - It is critical from this moment onward that we do not check
+            // cancellation tokens.  We are about to mutate source files from a previous program
+            // instance.  If we cancel midway through, we may end up in an inconsistent state where
+            // the program points to old source files that have been invalidated because of
+            // incremental parsing.
             var newSettings = hostCache.compilationSettings();
+            // Now create a new compiler
             var compilerHost = {
                 getSourceFile: getOrCreateSourceFile,
                 getSourceFileByPath: getOrCreateSourceFileByPath,
@@ -90613,6 +109037,7 @@ var ts;
                 getCurrentDirectory: function () { return currentDirectory; },
                 fileExists: fileExists,
                 readFile: function (fileName) {
+                    // stub missing host functionality
                     var path = ts.toPath(fileName, currentDirectory, getCanonicalFileName);
                     var entry = hostCache.getEntryByPath(path);
                     if (entry) {
@@ -90651,8 +109076,15 @@ var ts;
                 projectReferences: hostCache.getProjectReferences()
             };
             program = ts.createProgram(options);
+            // hostCache is captured in the closure for 'getOrCreateSourceFile' but it should not be used past this point.
+            // It needs to be cleared to allow all collected snapshots to be released
             hostCache = undefined;
+            // We reset this cache on structure invalidation so we don't hold on to outdated files for long; however we can't use the `compilerHost` above,
+            // Because it only functions until `hostCache` is cleared, while we'll potentially need the functionality to lazily read sourcemap files during
+            // the course of whatever called `synchronizeHostData`
             sourcemappedFileCache = createSourceFileLikeCache(host);
+            // Make sure all the nodes in the program are both bound, and have their parent
+            // pointers set property.
             program.getTypeChecker();
             return;
             function fileExists(fileName) {
@@ -90662,6 +109094,8 @@ var ts;
                     !ts.isString(entry) :
                     (!!host.fileExists && host.fileExists(fileName));
             }
+            // Release any files we have acquired in the old program but are
+            // not part of the new program.
             function onReleaseOldSourceFile(oldSourceFile, oldOptions) {
                 var oldSettingsKey = documentRegistry.getKeyForCompilationSettings(oldOptions);
                 documentRegistry.releaseDocumentWithKey(oldSourceFile.path, oldSettingsKey);
@@ -90671,20 +109105,54 @@ var ts;
             }
             function getOrCreateSourceFileByPath(fileName, path, _languageVersion, _onError, shouldCreateNewSourceFile) {
                 ts.Debug.assert(hostCache !== undefined);
+                // The program is asking for this file, check first if the host can locate it.
+                // If the host can not locate the file, then it does not exist. return undefined
+                // to the program to allow reporting of errors for missing files.
                 var hostFileInformation = hostCache.getOrCreateEntryByPath(fileName, path);
                 if (!hostFileInformation) {
                     return undefined;
                 }
+                // Check if the language version has changed since we last created a program; if they are the same,
+                // it is safe to reuse the sourceFiles; if not, then the shape of the AST can change, and the oldSourceFile
+                // can not be reused. we have to dump all syntax trees and create new ones.
                 if (!shouldCreateNewSourceFile) {
+                    // Check if the old program had this file already
                     var oldSourceFile = program && program.getSourceFileByPath(path);
                     if (oldSourceFile) {
+                        // We already had a source file for this file name.  Go to the registry to
+                        // ensure that we get the right up to date version of it.  We need this to
+                        // address the following race-condition.  Specifically, say we have the following:
+                        //
+                        //      LS1
+                        //          \
+                        //           DocumentRegistry
+                        //          /
+                        //      LS2
+                        //
+                        // Each LS has a reference to file 'foo.ts' at version 1.  LS2 then updates
+                        // it's version of 'foo.ts' to version 2.  This will cause LS2 and the
+                        // DocumentRegistry to have version 2 of the document.  HOwever, LS1 will
+                        // have version 1.  And *importantly* this source file will be *corrupt*.
+                        // The act of creating version 2 of the file irrevocably damages the version
+                        // 1 file.
+                        //
+                        // So, later when we call into LS1, we need to make sure that it doesn't use
+                        // it's source file any more, and instead defers to DocumentRegistry to get
+                        // either version 1, version 2 (or some other version) depending on what the
+                        // host says should be used.
+                        // We do not support the scenario where a host can modify a registered
+                        // file's script kind, i.e. in one project some file is treated as ".ts"
+                        // and in another as ".js"
                         ts.Debug.assertEqual(hostFileInformation.scriptKind, oldSourceFile.scriptKind, "Registered script kind should match new script kind.", path);
                         return documentRegistry.updateDocumentWithKey(fileName, path, newSettings, documentRegistryBucketKey, hostFileInformation.scriptSnapshot, hostFileInformation.version, hostFileInformation.scriptKind);
                     }
+                    // We didn't already have the file.  Fall through and acquire it from the registry.
                 }
+                // Could not find this file in the old program, create a new SourceFile for it.
                 return documentRegistry.acquireDocumentWithKey(fileName, path, newSettings, documentRegistryBucketKey, hostFileInformation.scriptSnapshot, hostFileInformation.version, hostFileInformation.scriptKind);
             }
         }
+        // TODO: GH#18217 frequently asserted as defined
         function getProgram() {
             if (syntaxOnly) {
                 ts.Debug.assert(program === undefined);
@@ -90694,28 +109162,36 @@ var ts;
             return program;
         }
         function cleanupSemanticCache() {
-            program = undefined;
+            program = undefined; // TODO: GH#18217
         }
         function dispose() {
             if (program) {
                 ts.forEach(program.getSourceFiles(), function (f) {
                     return documentRegistry.releaseDocument(f.fileName, program.getCompilerOptions());
                 });
-                program = undefined;
+                program = undefined; // TODO: GH#18217
             }
             host = undefined;
         }
+        /// Diagnostics
         function getSyntacticDiagnostics(fileName) {
             synchronizeHostData();
             return program.getSyntacticDiagnostics(getValidSourceFile(fileName), cancellationToken).slice();
         }
+        /**
+         * getSemanticDiagnostics return array of Diagnostics. If '-d' is not enabled, only report semantic errors
+         * If '-d' enabled, report both semantic and emitter errors
+         */
         function getSemanticDiagnostics(fileName) {
             synchronizeHostData();
             var targetSourceFile = getValidSourceFile(fileName);
+            // Only perform the action per file regardless of '-out' flag as LanguageServiceHost is expected to call this function per file.
+            // Therefore only get diagnostics for given file.
             var semanticDiagnostics = program.getSemanticDiagnostics(targetSourceFile, cancellationToken);
             if (!program.getCompilerOptions().declaration) {
                 return semanticDiagnostics.slice();
             }
+            // If '-d' is enabled, check for emitter error. One example of emitter error is export class implements non-export interface
             var declarationDiagnostics = program.getDeclarationDiagnostics(targetSourceFile, cancellationToken);
             return semanticDiagnostics.concat(declarationDiagnostics);
         }
@@ -90729,6 +109205,7 @@ var ts;
         }
         function getCompletionsAtPosition(fileName, position, options) {
             if (options === void 0) { options = ts.defaultPreferences; }
+            // Convert from deprecated options names to new names
             var fullPreferences = __assign({}, ts.identity(options), { includeCompletionsForModuleExports: options.includeCompletionsForModuleExports || options.includeExternalModuleExports, includeCompletionsWithInsertText: options.includeCompletionsWithInsertText || options.includeInsertTextCompletions });
             synchronizeHostData();
             return ts.Completions.getCompletionsAtPosition(host, program, log, getValidSourceFile(fileName), position, fullPreferences, options.triggerCharacter);
@@ -90736,7 +109213,8 @@ var ts;
         function getCompletionEntryDetails(fileName, position, name, formattingOptions, source, preferences) {
             if (preferences === void 0) { preferences = ts.defaultPreferences; }
             synchronizeHostData();
-            return ts.Completions.getCompletionEntryDetails(program, log, getValidSourceFile(fileName), position, { name: name, source: source }, host, (formattingOptions && ts.formatting.getFormatContext(formattingOptions)), getCanonicalFileName, preferences, cancellationToken);
+            return ts.Completions.getCompletionEntryDetails(program, log, getValidSourceFile(fileName), position, { name: name, source: source }, host, (formattingOptions && ts.formatting.getFormatContext(formattingOptions)), // TODO: GH#18217
+            getCanonicalFileName, preferences, cancellationToken);
         }
         function getCompletionEntrySymbol(fileName, position, name, source) {
             synchronizeHostData();
@@ -90745,31 +109223,36 @@ var ts;
         function getQuickInfoAtPosition(fileName, position) {
             synchronizeHostData();
             var sourceFile = getValidSourceFile(fileName);
-            var node = ts.getTouchingPropertyName(sourceFile, position, true);
+            var node = ts.getTouchingPropertyName(sourceFile, position);
             if (node === sourceFile) {
+                // Avoid giving quickInfo for the sourceFile as a whole.
                 return undefined;
             }
             var typeChecker = program.getTypeChecker();
             var symbol = getSymbolAtLocationForQuickInfo(node, typeChecker);
             if (!symbol || typeChecker.isUnknownSymbol(symbol)) {
+                // Try getting just type at this position and show
                 switch (node.kind) {
-                    case 71:
+                    case 71 /* Identifier */:
                         if (ts.isLabelName(node)) {
+                            // Type here will be 'any', avoid displaying this.
                             return undefined;
                         }
-                    case 185:
-                    case 146:
-                    case 99:
-                    case 174:
-                    case 97:
-                        var type_4 = typeChecker.getTypeAtLocation(node);
-                        return type_4 && {
-                            kind: "",
-                            kindModifiers: "",
+                    // falls through
+                    case 185 /* PropertyAccessExpression */:
+                    case 146 /* QualifiedName */:
+                    case 99 /* ThisKeyword */:
+                    case 174 /* ThisType */:
+                    case 97 /* SuperKeyword */:
+                        // For the identifiers/this/super etc get the type at position
+                        var type_1 = typeChecker.getTypeAtLocation(node);
+                        return type_1 && {
+                            kind: "" /* unknown */,
+                            kindModifiers: "" /* none */,
                             textSpan: ts.createTextSpanFromNode(node, sourceFile),
-                            displayParts: typeChecker.runWithCancellationToken(cancellationToken, function (typeChecker) { return ts.typeToDisplayParts(typeChecker, type_4, ts.getContainerNode(node)); }),
-                            documentation: type_4.symbol ? type_4.symbol.getDocumentationComment(typeChecker) : undefined,
-                            tags: type_4.symbol ? type_4.symbol.getJsDocTags() : undefined
+                            displayParts: typeChecker.runWithCancellationToken(cancellationToken, function (typeChecker) { return ts.typeToDisplayParts(typeChecker, type_1, ts.getContainerNode(node)); }),
+                            documentation: type_1.symbol ? type_1.symbol.getDocumentationComment(typeChecker) : undefined,
+                            tags: type_1.symbol ? type_1.symbol.getJsDocTags() : undefined
                         };
                 }
                 return undefined;
@@ -90800,9 +109283,10 @@ var ts;
         }
         function toLineColumnOffset(fileName, position) {
             var path = ts.toPath(fileName, currentDirectory, getCanonicalFileName);
-            var file = program.getSourceFile(path) || sourcemappedFileCache.get(path);
+            var file = program.getSourceFile(path) || sourcemappedFileCache.get(path); // TODO: GH#18217
             return file.getLineAndCharacterOfPosition(position);
         }
+        // Sometimes tools can sometimes see the following line as a source mapping url comment, so we mangle it a bit (the [M])
         var sourceMapCommentRegExp = /^\/\/[@#] source[M]appingURL=(.+)$/gm;
         var base64UrlRegExp = /^data:(?:application\/json(?:;charset=[uU][tT][fF]-8);base64,([A-Za-z0-9+\/=]+)$)?/;
         function scanForSourcemapURL(fileName) {
@@ -90825,8 +109309,10 @@ var ts;
                 maps = JSON.parse(contents);
             }
             catch (_a) {
+                // swallow error
             }
             if (!maps || !maps.sources || !maps.file || !maps.mappings) {
+                // obviously invalid map
                 return file.sourceMapper = ts.sourcemaps.identitySourceMapper;
             }
             return file.sourceMapper = ts.sourcemaps.decode({
@@ -90851,6 +109337,7 @@ var ts;
                         var base64Object = match[1];
                         return convertDocumentToSourceMapper(file, ts.base64decode(ts.sys, base64Object), fileName);
                     }
+                    // Not a data URL we can parse, skip it
                     mapFileName = undefined;
                 }
             }
@@ -90863,7 +109350,7 @@ var ts;
                 var location = possibleMapLocations_1[_i];
                 var mapPath = ts.toPath(location, ts.getDirectoryPath(fileName), getCanonicalFileName);
                 if (host.fileExists(mapPath)) {
-                    return convertDocumentToSourceMapper(file, host.readFile(mapPath), mapPath);
+                    return convertDocumentToSourceMapper(file, host.readFile(mapPath), mapPath); // TODO: GH#18217
                 }
             }
             return file.sourceMapper = ts.sourcemaps.identitySourceMapper;
@@ -90873,7 +109360,7 @@ var ts;
             function getTargetOfMappedPosition(input, original) {
                 if (original === void 0) { original = input; }
                 var info = extract(input);
-                if (ts.endsWith(info.fileName, ".d.ts")) {
+                if (ts.endsWith(info.fileName, ".d.ts" /* Dts */)) {
                     var file = program.getSourceFile(info.fileName);
                     if (!file) {
                         var path = ts.toPath(info.fileName, currentDirectory, getCanonicalFileName);
@@ -90907,6 +109394,7 @@ var ts;
         function getTargetOfMappedDeclarationFiles(infos) {
             return ts.map(infos, function (d) { return getTargetOfMappedDeclarationInfo(d); });
         }
+        /// Goto definition
         function getDefinitionAtPosition(fileName, position) {
             synchronizeHostData();
             return getTargetOfMappedDeclarationFiles(ts.GoToDefinition.getDefinitionAtPosition(program, getValidSourceFile(fileName), position));
@@ -90929,6 +109417,7 @@ var ts;
             synchronizeHostData();
             return getTargetOfMappedDeclarationFiles(ts.GoToDefinition.getTypeDefinitionAtPosition(program.getTypeChecker(), getValidSourceFile(fileName), position));
         }
+        /// Goto implementation
         var getTargetOfMappedImplementationLocation = makeGetTargetOfMappedPosition(function (info) { return ({ fileName: info.fileName, position: info.textSpan.start }); }, function (newLoc, info) { return ({
             fileName: newLoc.fileName,
             kind: info.kind,
@@ -90947,11 +109436,12 @@ var ts;
             synchronizeHostData();
             return getTargetOfMappedImplementationLocations(ts.FindAllReferences.getImplementationsAtPosition(program, cancellationToken, program.getSourceFiles(), getValidSourceFile(fileName), position));
         }
+        /// References and Occurrences
         function getOccurrencesAtPosition(fileName, position) {
             return ts.flatMap(getDocumentHighlights(fileName, position, [fileName]), function (entry) { return entry.highlightSpans.map(function (highlightSpan) { return ({
                 fileName: entry.fileName,
                 textSpan: highlightSpan.textSpan,
-                isWriteAccess: highlightSpan.kind === "writtenReference",
+                isWriteAccess: highlightSpan.kind === "writtenReference" /* writtenReference */,
                 isDefinition: false,
                 isInString: highlightSpan.isInString,
             }); }); });
@@ -90971,6 +109461,7 @@ var ts;
         }
         function getReferences(fileName, position, options) {
             synchronizeHostData();
+            // Exclude default library when renaming as commonly user don't want to change that file.
             var sourceFiles = options && options.isForRename
                 ? program.getSourceFiles().filter(function (sourceFile) { return !program.isSourceFileDefaultLibrary(sourceFile); })
                 : program.getSourceFiles();
@@ -90980,6 +109471,7 @@ var ts;
             synchronizeHostData();
             return ts.FindAllReferences.findReferencedSymbols(program, cancellationToken, program.getSourceFiles(), getValidSourceFile(fileName), position);
         }
+        /// NavigateTo
         function getNavigateToItems(searchValue, maxResultCount, fileName, excludeDtsFiles) {
             if (excludeDtsFiles === void 0) { excludeDtsFiles = false; }
             synchronizeHostData();
@@ -90993,56 +109485,71 @@ var ts;
             var customTransformers = host.getCustomTransformers && host.getCustomTransformers();
             return ts.getFileEmitOutput(program, sourceFile, emitOnlyDtsFiles, cancellationToken, customTransformers);
         }
+        // Signature help
+        /**
+         * This is a semantic operation.
+         */
         function getSignatureHelpItems(fileName, position) {
             synchronizeHostData();
             var sourceFile = getValidSourceFile(fileName);
             return ts.SignatureHelp.getSignatureHelpItems(program, sourceFile, position, cancellationToken);
         }
+        /// Syntactic features
         function getNonBoundSourceFile(fileName) {
             return syntaxTreeCache.getCurrentSourceFile(fileName);
         }
         function getNameOrDottedNameSpan(fileName, startPos, _endPos) {
             var sourceFile = syntaxTreeCache.getCurrentSourceFile(fileName);
-            var node = ts.getTouchingPropertyName(sourceFile, startPos, false);
+            // Get node at the location
+            var node = ts.getTouchingPropertyName(sourceFile, startPos);
             if (node === sourceFile) {
                 return undefined;
             }
             switch (node.kind) {
-                case 185:
-                case 146:
-                case 9:
-                case 86:
-                case 101:
-                case 95:
-                case 97:
-                case 99:
-                case 174:
-                case 71:
+                case 185 /* PropertyAccessExpression */:
+                case 146 /* QualifiedName */:
+                case 9 /* StringLiteral */:
+                case 86 /* FalseKeyword */:
+                case 101 /* TrueKeyword */:
+                case 95 /* NullKeyword */:
+                case 97 /* SuperKeyword */:
+                case 99 /* ThisKeyword */:
+                case 174 /* ThisType */:
+                case 71 /* Identifier */:
                     break;
+                // Cant create the text span
                 default:
                     return undefined;
             }
             var nodeForStartPos = node;
             while (true) {
                 if (ts.isRightSideOfPropertyAccess(nodeForStartPos) || ts.isRightSideOfQualifiedName(nodeForStartPos)) {
+                    // If on the span is in right side of the the property or qualified name, return the span from the qualified name pos to end of this node
                     nodeForStartPos = nodeForStartPos.parent;
                 }
                 else if (ts.isNameOfModuleDeclaration(nodeForStartPos)) {
-                    if (nodeForStartPos.parent.parent.kind === 239 &&
+                    // If this is name of a module declarations, check if this is right side of dotted module name
+                    // If parent of the module declaration which is parent of this node is module declaration and its body is the module declaration that this node is name of
+                    // Then this name is name from dotted module
+                    if (nodeForStartPos.parent.parent.kind === 239 /* ModuleDeclaration */ &&
                         nodeForStartPos.parent.parent.body === nodeForStartPos.parent) {
+                        // Use parent module declarations name for start pos
                         nodeForStartPos = nodeForStartPos.parent.parent.name;
                     }
                     else {
+                        // We have to use this name for start pos
                         break;
                     }
                 }
                 else {
+                    // Is not a member expression so we have found the node for start pos
                     break;
                 }
             }
             return ts.createTextSpanFromBounds(nodeForStartPos.getStart(), node.getEnd());
         }
         function getBreakpointStatementAtPosition(fileName, position) {
+            // doesn't use compiler - no need to synchronize with host
             var sourceFile = syntaxTreeCache.getCurrentSourceFile(fileName);
             return ts.BreakpointResolver.spanInSourceFileAtLocation(sourceFile, position);
         }
@@ -91054,10 +109561,11 @@ var ts;
         }
         function isTsOrTsxFile(fileName) {
             var kind = ts.getScriptKind(fileName, host);
-            return kind === 3 || kind === 4;
+            return kind === 3 /* TS */ || kind === 4 /* TSX */;
         }
         function getSemanticClassifications(fileName, span) {
             if (!isTsOrTsxFile(fileName)) {
+                // do not run semantic classification on non-ts-or-tsx files
                 return [];
             }
             synchronizeHostData();
@@ -91065,33 +109573,38 @@ var ts;
         }
         function getEncodedSemanticClassifications(fileName, span) {
             if (!isTsOrTsxFile(fileName)) {
-                return { spans: [], endOfLineState: 0 };
+                // do not run semantic classification on non-ts-or-tsx files
+                return { spans: [], endOfLineState: 0 /* None */ };
             }
             synchronizeHostData();
             return ts.getEncodedSemanticClassifications(program.getTypeChecker(), cancellationToken, getValidSourceFile(fileName), program.getClassifiableNames(), span);
         }
         function getSyntacticClassifications(fileName, span) {
+            // doesn't use compiler - no need to synchronize with host
             return ts.getSyntacticClassifications(cancellationToken, syntaxTreeCache.getCurrentSourceFile(fileName), span);
         }
         function getEncodedSyntacticClassifications(fileName, span) {
+            // doesn't use compiler - no need to synchronize with host
             return ts.getEncodedSyntacticClassifications(cancellationToken, syntaxTreeCache.getCurrentSourceFile(fileName), span);
         }
         function getOutliningSpans(fileName) {
+            // doesn't use compiler - no need to synchronize with host
             var sourceFile = syntaxTreeCache.getCurrentSourceFile(fileName);
             return ts.OutliningElementsCollector.collectElements(sourceFile, cancellationToken);
         }
         var braceMatching = ts.createMapFromTemplate((_a = {},
-            _a[17] = 18,
-            _a[19] = 20,
-            _a[21] = 22,
-            _a[29] = 27,
+            _a[17 /* OpenBraceToken */] = 18 /* CloseBraceToken */,
+            _a[19 /* OpenParenToken */] = 20 /* CloseParenToken */,
+            _a[21 /* OpenBracketToken */] = 22 /* CloseBracketToken */,
+            _a[29 /* GreaterThanToken */] = 27 /* LessThanToken */,
             _a));
         braceMatching.forEach(function (value, key) { return braceMatching.set(value.toString(), Number(key)); });
         function getBraceMatchingAtPosition(fileName, position) {
             var sourceFile = syntaxTreeCache.getCurrentSourceFile(fileName);
-            var token = ts.getTouchingToken(sourceFile, position, false);
+            var token = ts.getTouchingToken(sourceFile, position, /*includeJsDocComment*/ false);
             var matchKind = token.getStart(sourceFile) === position ? braceMatching.get(token.kind.toString()) : undefined;
             var match = matchKind && ts.findChildOfKind(token.parent, matchKind, sourceFile);
+            // We want to order the braces when we return the result.
             return match ? [ts.createTextSpanFromNode(token, sourceFile), ts.createTextSpanFromNode(match, sourceFile)].sort(function (a, b) { return a.start - b.start; }) : ts.emptyArray;
         }
         function getIndentationAtPosition(fileName, position, editorOptions) {
@@ -91171,29 +109684,37 @@ var ts;
                         : Promise.reject("Host does not implement `installPackage`");
                 default:
                     return ts.Debug.fail();
+                // TODO: Debug.assertNever(action); will only work if there is more than one type.
             }
         }
         function getDocCommentTemplateAtPosition(fileName, position) {
             return ts.JsDoc.getDocCommentTemplateAtPosition(ts.getNewLineOrDefaultFromHost(host), syntaxTreeCache.getCurrentSourceFile(fileName), position);
         }
         function isValidBraceCompletionAtPosition(fileName, position, openingBrace) {
-            if (openingBrace === 60) {
+            // '<' is currently not supported, figuring out if we're in a Generic Type vs. a comparison is too
+            // expensive to do during typing scenarios
+            // i.e. whether we're dealing with:
+            //      var x = new foo<| ( with class foo<T>{} )
+            // or
+            //      var y = 3 <|
+            if (openingBrace === 60 /* lessThan */) {
                 return false;
             }
             var sourceFile = syntaxTreeCache.getCurrentSourceFile(fileName);
+            // Check if in a context where we don't want to perform any insertion
             if (ts.isInString(sourceFile, position)) {
                 return false;
             }
             if (ts.isInsideJsxElementOrAttribute(sourceFile, position)) {
-                return openingBrace === 123;
+                return openingBrace === 123 /* openBrace */;
             }
             if (ts.isInTemplateString(sourceFile, position)) {
                 return false;
             }
             switch (openingBrace) {
-                case 39:
-                case 34:
-                case 96:
+                case 39 /* singleQuote */:
+                case 34 /* doubleQuote */:
+                case 96 /* backtick */:
                     return !ts.isInComment(sourceFile, position);
             }
             return true;
@@ -91203,7 +109724,7 @@ var ts;
             var token = ts.findPrecedingToken(position, sourceFile);
             if (!token)
                 return undefined;
-            var element = token.kind === 29 && ts.isJsxOpeningElement(token.parent) ? token.parent.parent
+            var element = token.kind === 29 /* GreaterThanToken */ && ts.isJsxOpeningElement(token.parent) ? token.parent.parent
                 : ts.isJsxText(token) ? token.parent : undefined;
             if (element && !ts.tagNamesAreEquivalent(element.openingElement.tagName, element.closingElement.tagName)) {
                 return { newText: "</" + element.openingElement.tagName.getText(sourceFile) + ">" };
@@ -91215,20 +109736,46 @@ var ts;
             return range && ts.createTextSpanFromRange(range);
         }
         function getTodoComments(fileName, descriptors) {
+            // Note: while getting todo comments seems like a syntactic operation, we actually
+            // treat it as a semantic operation here.  This is because we expect our host to call
+            // this on every single file.  If we treat this syntactically, then that will cause
+            // us to populate and throw away the tree in our syntax tree cache for each file.  By
+            // treating this as a semantic operation, we can access any tree without throwing
+            // anything away.
             synchronizeHostData();
             var sourceFile = getValidSourceFile(fileName);
             cancellationToken.throwIfCancellationRequested();
             var fileContents = sourceFile.text;
             var result = [];
+            // Exclude node_modules files as we don't want to show the todos of external libraries.
             if (descriptors.length > 0 && !isNodeModulesFile(sourceFile.fileName)) {
                 var regExp = getTodoCommentsRegExp();
                 var matchArray = void 0;
                 while (matchArray = regExp.exec(fileContents)) {
                     cancellationToken.throwIfCancellationRequested();
+                    // If we got a match, here is what the match array will look like.  Say the source text is:
+                    //
+                    //      "    // hack   1"
+                    //
+                    // The result array with the regexp:    will be:
+                    //
+                    //      ["// hack   1", "// ", "hack   1", undefined, "hack"]
+                    //
+                    // Here are the relevant capture groups:
+                    //  0) The full match for the entire regexp.
+                    //  1) The preamble to the message portion.
+                    //  2) The message portion.
+                    //  3...N) The descriptor that was matched - by index.  'undefined' for each
+                    //         descriptor that didn't match.  an actual value if it did match.
+                    //
+                    //  i.e. 'undefined' in position 3 above means TODO(jason) didn't match.
+                    //       "hack"      in position 4 means HACK did match.
                     var firstDescriptorCaptureIndex = 3;
                     ts.Debug.assert(matchArray.length === descriptors.length + firstDescriptorCaptureIndex);
                     var preamble = matchArray[1];
                     var matchPosition = matchArray.index + preamble.length;
+                    // OK, we have found a match in the file.  This is only an acceptable match if
+                    // it is contained within a comment.
                     if (!ts.isInComment(sourceFile, matchPosition)) {
                         continue;
                     }
@@ -91240,6 +109787,8 @@ var ts;
                     }
                     if (descriptor === undefined)
                         return ts.Debug.fail();
+                    // We don't want to match something like 'TODOBY', so we make sure a non
+                    // letter/digit follows the match.
                     if (isLetterOrDigit(fileContents.charCodeAt(matchPosition + descriptor.text.length))) {
                         continue;
                     }
@@ -91252,21 +109801,59 @@ var ts;
                 return str.replace(/[\-\[\]\/\{\}\(\)\*\+\?\.\\\^\$\|]/g, "\\$&");
             }
             function getTodoCommentsRegExp() {
+                // NOTE: `?:` means 'non-capture group'.  It allows us to have groups without having to
+                // filter them out later in the final result array.
+                // TODO comments can appear in one of the following forms:
+                //
+                //  1)      // TODO     or  /////////// TODO
+                //
+                //  2)      /* TODO     or  /********** TODO
+                //
+                //  3)      /*
+                //           *   TODO
+                //           */
+                //
+                // The following three regexps are used to match the start of the text up to the TODO
+                // comment portion.
                 var singleLineCommentStart = /(?:\/\/+\s*)/.source;
                 var multiLineCommentStart = /(?:\/\*+\s*)/.source;
                 var anyNumberOfSpacesAndAsterisksAtStartOfLine = /(?:^(?:\s|\*)*)/.source;
+                // Match any of the above three TODO comment start regexps.
+                // Note that the outermost group *is* a capture group.  We want to capture the preamble
+                // so that we can determine the starting position of the TODO comment match.
                 var preamble = "(" + anyNumberOfSpacesAndAsterisksAtStartOfLine + "|" + singleLineCommentStart + "|" + multiLineCommentStart + ")";
+                // Takes the descriptors and forms a regexp that matches them as if they were literals.
+                // For example, if the descriptors are "TODO(jason)" and "HACK", then this will be:
+                //
+                //      (?:(TODO\(jason\))|(HACK))
+                //
+                // Note that the outermost group is *not* a capture group, but the innermost groups
+                // *are* capture groups.  By capturing the inner literals we can determine after
+                // matching which descriptor we are dealing with.
                 var literals = "(?:" + ts.map(descriptors, function (d) { return "(" + escapeRegExp(d.text) + ")"; }).join("|") + ")";
+                // After matching a descriptor literal, the following regexp matches the rest of the
+                // text up to the end of the line (or */).
                 var endOfLineOrEndOfComment = /(?:$|\*\/)/.source;
                 var messageRemainder = /(?:.*?)/.source;
+                // This is the portion of the match we'll return as part of the TODO comment result. We
+                // match the literal portion up to the end of the line or end of comment.
                 var messagePortion = "(" + literals + messageRemainder + ")";
                 var regExpString = preamble + messagePortion + endOfLineOrEndOfComment;
+                // The final regexp will look like this:
+                // /((?:\/\/+\s*)|(?:\/\*+\s*)|(?:^(?:\s|\*)*))((?:(TODO\(jason\))|(HACK))(?:.*?))(?:$|\*\/)/gim
+                // The flags of the regexp are important here.
+                //  'g' is so that we are doing a global search and can find matches several times
+                //  in the input.
+                //
+                //  'i' is for case insensitivity (We do this to match C# TODO comment code).
+                //
+                //  'm' is so we can find matches in a multi-line input.
                 return new RegExp(regExpString, "gim");
             }
             function isLetterOrDigit(char) {
-                return (char >= 97 && char <= 122) ||
-                    (char >= 65 && char <= 90) ||
-                    (char >= 48 && char <= 57);
+                return (char >= 97 /* a */ && char <= 122 /* z */) ||
+                    (char >= 65 /* A */ && char <= 90 /* Z */) ||
+                    (char >= 48 /* _0 */ && char <= 57 /* _9 */);
             }
             function isNodeModulesFile(path) {
                 return ts.stringContains(path, "/node_modules/");
@@ -91358,11 +109945,13 @@ var ts;
         };
     }
     ts.createLanguageService = createLanguageService;
+    /* @internal */
+    /** Names in the name table are escaped, so an identifier `__foo` will have a name table entry `___foo`. */
     function getNameTable(sourceFile) {
         if (!sourceFile.nameTable) {
             initializeNameTable(sourceFile);
         }
-        return sourceFile.nameTable;
+        return sourceFile.nameTable; // TODO: GH#18217
     }
     ts.getNameTable = getNameTable;
     function initializeNameTable(sourceFile) {
@@ -91381,50 +109970,63 @@ var ts;
             }
         });
     }
+    /**
+     * We want to store any numbers/strings if they were a name that could be
+     * related to a declaration.  So, if we have 'import x = require("something")'
+     * then we want 'something' to be in the name table.  Similarly, if we have
+     * "a['propname']" then we want to store "propname" in the name table.
+     */
     function literalIsName(node) {
         return ts.isDeclarationName(node) ||
-            node.parent.kind === 254 ||
+            node.parent.kind === 254 /* ExternalModuleReference */ ||
             isArgumentOfElementAccessExpression(node) ||
             ts.isLiteralComputedPropertyDeclarationName(node);
     }
+    /**
+     * Returns the containing object literal property declaration given a possible name node, e.g. "a" in x = { "a": 1 }
+     */
+    /* @internal */
     function getContainingObjectLiteralElement(node) {
         switch (node.kind) {
-            case 9:
-            case 8:
-                if (node.parent.kind === 147) {
+            case 9 /* StringLiteral */:
+            case 8 /* NumericLiteral */:
+                if (node.parent.kind === 147 /* ComputedPropertyName */) {
                     return ts.isObjectLiteralElement(node.parent.parent) ? node.parent.parent : undefined;
                 }
-            case 71:
+            // falls through
+            case 71 /* Identifier */:
                 return ts.isObjectLiteralElement(node.parent) &&
-                    (node.parent.parent.kind === 184 || node.parent.parent.kind === 263) &&
+                    (node.parent.parent.kind === 184 /* ObjectLiteralExpression */ || node.parent.parent.kind === 263 /* JsxAttributes */) &&
                     node.parent.name === node ? node.parent : undefined;
         }
         return undefined;
     }
     ts.getContainingObjectLiteralElement = getContainingObjectLiteralElement;
+    /* @internal */
     function getPropertySymbolsFromContextualType(typeChecker, node) {
         var objectLiteral = node.parent;
-        var contextualType = typeChecker.getContextualType(objectLiteral);
-        return getPropertySymbolsFromType(contextualType, node.name);
+        var contextualType = typeChecker.getContextualType(objectLiteral); // TODO: GH#18217
+        return getPropertySymbolsFromType(contextualType, node.name); // TODO: GH#18217
     }
     ts.getPropertySymbolsFromContextualType = getPropertySymbolsFromContextualType;
+    /* @internal */
     function getPropertySymbolsFromType(type, propName) {
         var name = ts.unescapeLeadingUnderscores(ts.getTextOfPropertyName(propName));
         if (name && type) {
-            var result_7 = [];
+            var result_2 = [];
             var symbol = type.getProperty(name);
-            if (type.flags & 262144) {
+            if (type.flags & 262144 /* Union */) {
                 ts.forEach(type.types, function (t) {
                     var symbol = t.getProperty(name);
                     if (symbol) {
-                        result_7.push(symbol);
+                        result_2.push(symbol);
                     }
                 });
-                return result_7;
+                return result_2;
             }
             if (symbol) {
-                result_7.push(symbol);
-                return result_7;
+                result_2.push(symbol);
+                return result_2;
             }
         }
         return undefined;
@@ -91433,10 +110035,16 @@ var ts;
     function isArgumentOfElementAccessExpression(node) {
         return node &&
             node.parent &&
-            node.parent.kind === 186 &&
+            node.parent.kind === 186 /* ElementAccessExpression */ &&
             node.parent.argumentExpression === node;
     }
+    /**
+     * Get the path of the default library files (lib.d.ts) as distributed with the typescript
+     * node package.
+     * The functionality is not supported if the ts module is consumed outside of a node module.
+     */
     function getDefaultLibFilePath(options) {
+        // Check __dirname is defined and that we are on a node.js system.
         if (typeof __dirname !== "undefined") {
             return __dirname + ts.directorySeparator + ts.getDefaultLibFileName(options);
         }
@@ -91445,26 +110053,39 @@ var ts;
     ts.getDefaultLibFilePath = getDefaultLibFilePath;
     ts.objectAllocator = getServicesObjectAllocator();
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var BreakpointResolver;
     (function (BreakpointResolver) {
+        /**
+         * Get the breakpoint span in given sourceFile
+         */
         function spanInSourceFileAtLocation(sourceFile, position) {
+            // Cannot set breakpoint in dts file
             if (sourceFile.isDeclarationFile) {
                 return undefined;
             }
-            var tokenAtLocation = ts.getTokenAtPosition(sourceFile, position, false);
+            var tokenAtLocation = ts.getTokenAtPosition(sourceFile, position, /*includeJsDocComment*/ false);
             var lineOfPosition = sourceFile.getLineAndCharacterOfPosition(position).line;
             if (sourceFile.getLineAndCharacterOfPosition(tokenAtLocation.getStart(sourceFile)).line > lineOfPosition) {
+                // Get previous token if the token is returned starts on new line
+                // eg: let x =10; |--- cursor is here
+                //     let y = 10;
+                // token at position will return let keyword on second line as the token but we would like to use
+                // token on same line if trailing trivia (comments or white spaces on same line) part of the last token on that line
                 var preceding = ts.findPrecedingToken(tokenAtLocation.pos, sourceFile);
+                // It's a blank line
                 if (!preceding || sourceFile.getLineAndCharacterOfPosition(preceding.getEnd()).line !== lineOfPosition) {
                     return undefined;
                 }
                 tokenAtLocation = preceding;
             }
-            if (tokenAtLocation.flags & 4194304) {
+            // Cannot set breakpoint in ambient declarations
+            if (tokenAtLocation.flags & 4194304 /* Ambient */) {
                 return undefined;
             }
+            // Get the span in the node based on its syntax
             return spanInNode(tokenAtLocation);
             function textSpan(startNode, endNode) {
                 var start = startNode.decorators ?
@@ -91494,229 +110115,292 @@ var ts;
                 if (node) {
                     var parent = node.parent;
                     switch (node.kind) {
-                        case 214:
+                        case 214 /* VariableStatement */:
+                            // Span on first variable declaration
                             return spanInVariableDeclaration(node.declarationList.declarations[0]);
-                        case 232:
-                        case 152:
-                        case 151:
+                        case 232 /* VariableDeclaration */:
+                        case 152 /* PropertyDeclaration */:
+                        case 151 /* PropertySignature */:
                             return spanInVariableDeclaration(node);
-                        case 149:
+                        case 149 /* Parameter */:
                             return spanInParameterDeclaration(node);
-                        case 234:
-                        case 154:
-                        case 153:
-                        case 156:
-                        case 157:
-                        case 155:
-                        case 192:
-                        case 193:
+                        case 234 /* FunctionDeclaration */:
+                        case 154 /* MethodDeclaration */:
+                        case 153 /* MethodSignature */:
+                        case 156 /* GetAccessor */:
+                        case 157 /* SetAccessor */:
+                        case 155 /* Constructor */:
+                        case 192 /* FunctionExpression */:
+                        case 193 /* ArrowFunction */:
                             return spanInFunctionDeclaration(node);
-                        case 213:
+                        case 213 /* Block */:
                             if (ts.isFunctionBlock(node)) {
                                 return spanInFunctionBlock(node);
                             }
-                        case 240:
+                        // falls through
+                        case 240 /* ModuleBlock */:
                             return spanInBlock(node);
-                        case 269:
+                        case 269 /* CatchClause */:
                             return spanInBlock(node.block);
-                        case 216:
+                        case 216 /* ExpressionStatement */:
+                            // span on the expression
                             return textSpan(node.expression);
-                        case 225:
+                        case 225 /* ReturnStatement */:
+                            // span on return keyword and expression if present
                             return textSpan(node.getChildAt(0), node.expression);
-                        case 219:
+                        case 219 /* WhileStatement */:
+                            // Span on while(...)
                             return textSpanEndingAtNextToken(node, node.expression);
-                        case 218:
+                        case 218 /* DoStatement */:
+                            // span in statement of the do statement
                             return spanInNode(node.statement);
-                        case 231:
+                        case 231 /* DebuggerStatement */:
+                            // span on debugger keyword
                             return textSpan(node.getChildAt(0));
-                        case 217:
+                        case 217 /* IfStatement */:
+                            // set on if(..) span
                             return textSpanEndingAtNextToken(node, node.expression);
-                        case 228:
+                        case 228 /* LabeledStatement */:
+                            // span in statement
                             return spanInNode(node.statement);
-                        case 224:
-                        case 223:
+                        case 224 /* BreakStatement */:
+                        case 223 /* ContinueStatement */:
+                            // On break or continue keyword and label if present
                             return textSpan(node.getChildAt(0), node.label);
-                        case 220:
+                        case 220 /* ForStatement */:
                             return spanInForStatement(node);
-                        case 221:
+                        case 221 /* ForInStatement */:
+                            // span of for (a in ...)
                             return textSpanEndingAtNextToken(node, node.expression);
-                        case 222:
+                        case 222 /* ForOfStatement */:
+                            // span in initializer
                             return spanInInitializerOfForLike(node);
-                        case 227:
+                        case 227 /* SwitchStatement */:
+                            // span on switch(...)
                             return textSpanEndingAtNextToken(node, node.expression);
-                        case 266:
-                        case 267:
+                        case 266 /* CaseClause */:
+                        case 267 /* DefaultClause */:
+                            // span in first statement of the clause
                             return spanInNode(node.statements[0]);
-                        case 230:
+                        case 230 /* TryStatement */:
+                            // span in try block
                             return spanInBlock(node.tryBlock);
-                        case 229:
+                        case 229 /* ThrowStatement */:
+                            // span in throw ...
                             return textSpan(node, node.expression);
-                        case 249:
+                        case 249 /* ExportAssignment */:
+                            // span on export = id
                             return textSpan(node, node.expression);
-                        case 243:
+                        case 243 /* ImportEqualsDeclaration */:
+                            // import statement without including semicolon
                             return textSpan(node, node.moduleReference);
-                        case 244:
+                        case 244 /* ImportDeclaration */:
+                            // import statement without including semicolon
                             return textSpan(node, node.moduleSpecifier);
-                        case 250:
+                        case 250 /* ExportDeclaration */:
+                            // import statement without including semicolon
                             return textSpan(node, node.moduleSpecifier);
-                        case 239:
-                            if (ts.getModuleInstanceState(node) !== 1) {
+                        case 239 /* ModuleDeclaration */:
+                            // span on complete module if it is instantiated
+                            if (ts.getModuleInstanceState(node) !== 1 /* Instantiated */) {
                                 return undefined;
                             }
-                        case 235:
-                        case 238:
-                        case 273:
-                        case 182:
+                        // falls through
+                        case 235 /* ClassDeclaration */:
+                        case 238 /* EnumDeclaration */:
+                        case 273 /* EnumMember */:
+                        case 182 /* BindingElement */:
+                            // span on complete node
                             return textSpan(node);
-                        case 226:
+                        case 226 /* WithStatement */:
+                            // span in statement
                             return spanInNode(node.statement);
-                        case 150:
+                        case 150 /* Decorator */:
                             return spanInNodeArray(parent.decorators);
-                        case 180:
-                        case 181:
+                        case 180 /* ObjectBindingPattern */:
+                        case 181 /* ArrayBindingPattern */:
                             return spanInBindingPattern(node);
-                        case 236:
-                        case 237:
+                        // No breakpoint in interface, type alias
+                        case 236 /* InterfaceDeclaration */:
+                        case 237 /* TypeAliasDeclaration */:
                             return undefined;
-                        case 25:
-                        case 1:
+                        // Tokens:
+                        case 25 /* SemicolonToken */:
+                        case 1 /* EndOfFileToken */:
                             return spanInNodeIfStartsOnSameLine(ts.findPrecedingToken(node.pos, sourceFile));
-                        case 26:
+                        case 26 /* CommaToken */:
                             return spanInPreviousNode(node);
-                        case 17:
+                        case 17 /* OpenBraceToken */:
                             return spanInOpenBraceToken(node);
-                        case 18:
+                        case 18 /* CloseBraceToken */:
                             return spanInCloseBraceToken(node);
-                        case 22:
+                        case 22 /* CloseBracketToken */:
                             return spanInCloseBracketToken(node);
-                        case 19:
+                        case 19 /* OpenParenToken */:
                             return spanInOpenParenToken(node);
-                        case 20:
+                        case 20 /* CloseParenToken */:
                             return spanInCloseParenToken(node);
-                        case 56:
+                        case 56 /* ColonToken */:
                             return spanInColonToken(node);
-                        case 29:
-                        case 27:
+                        case 29 /* GreaterThanToken */:
+                        case 27 /* LessThanToken */:
                             return spanInGreaterThanOrLessThanToken(node);
-                        case 106:
+                        // Keywords:
+                        case 106 /* WhileKeyword */:
                             return spanInWhileKeyword(node);
-                        case 82:
-                        case 74:
-                        case 87:
+                        case 82 /* ElseKeyword */:
+                        case 74 /* CatchKeyword */:
+                        case 87 /* FinallyKeyword */:
                             return spanInNextNode(node);
-                        case 145:
+                        case 145 /* OfKeyword */:
                             return spanInOfKeyword(node);
                         default:
+                            // Destructuring pattern in destructuring assignment
+                            // [a, b, c] of
+                            // [a, b, c] = expression
                             if (ts.isArrayLiteralOrObjectLiteralDestructuringPattern(node)) {
                                 return spanInArrayLiteralOrObjectLiteralDestructuringPattern(node);
                             }
-                            if ((node.kind === 71 ||
-                                node.kind === 204 ||
-                                node.kind === 270 ||
-                                node.kind === 271) &&
+                            // Set breakpoint on identifier element of destructuring pattern
+                            // `a` or `...c` or `d: x` from
+                            // `[a, b, ...c]` or `{ a, b }` or `{ d: x }` from destructuring pattern
+                            if ((node.kind === 71 /* Identifier */ ||
+                                node.kind === 204 /* SpreadElement */ ||
+                                node.kind === 270 /* PropertyAssignment */ ||
+                                node.kind === 271 /* ShorthandPropertyAssignment */) &&
                                 ts.isArrayLiteralOrObjectLiteralDestructuringPattern(parent)) {
                                 return textSpan(node);
                             }
-                            if (node.kind === 200) {
+                            if (node.kind === 200 /* BinaryExpression */) {
                                 var _a = node, left = _a.left, operatorToken = _a.operatorToken;
+                                // Set breakpoint in destructuring pattern if its destructuring assignment
+                                // [a, b, c] or {a, b, c} of
+                                // [a, b, c] = expression or
+                                // {a, b, c} = expression
                                 if (ts.isArrayLiteralOrObjectLiteralDestructuringPattern(left)) {
                                     return spanInArrayLiteralOrObjectLiteralDestructuringPattern(left);
                                 }
-                                if (operatorToken.kind === 58 && ts.isArrayLiteralOrObjectLiteralDestructuringPattern(node.parent)) {
+                                if (operatorToken.kind === 58 /* EqualsToken */ && ts.isArrayLiteralOrObjectLiteralDestructuringPattern(node.parent)) {
+                                    // Set breakpoint on assignment expression element of destructuring pattern
+                                    // a = expression of
+                                    // [a = expression, b, c] = someExpression or
+                                    // { a = expression, b, c } = someExpression
                                     return textSpan(node);
                                 }
-                                if (operatorToken.kind === 26) {
+                                if (operatorToken.kind === 26 /* CommaToken */) {
                                     return spanInNode(left);
                                 }
                             }
                             if (ts.isExpressionNode(node)) {
                                 switch (parent.kind) {
-                                    case 218:
+                                    case 218 /* DoStatement */:
+                                        // Set span as if on while keyword
                                         return spanInPreviousNode(node);
-                                    case 150:
+                                    case 150 /* Decorator */:
+                                        // Set breakpoint on the decorator emit
                                         return spanInNode(node.parent);
-                                    case 220:
-                                    case 222:
+                                    case 220 /* ForStatement */:
+                                    case 222 /* ForOfStatement */:
                                         return textSpan(node);
-                                    case 200:
-                                        if (node.parent.operatorToken.kind === 26) {
+                                    case 200 /* BinaryExpression */:
+                                        if (node.parent.operatorToken.kind === 26 /* CommaToken */) {
+                                            // If this is a comma expression, the breakpoint is possible in this expression
                                             return textSpan(node);
                                         }
                                         break;
-                                    case 193:
+                                    case 193 /* ArrowFunction */:
                                         if (node.parent.body === node) {
+                                            // If this is body of arrow function, it is allowed to have the breakpoint
                                             return textSpan(node);
                                         }
                                         break;
                                 }
                             }
                             switch (node.parent.kind) {
-                                case 270:
+                                case 270 /* PropertyAssignment */:
+                                    // If this is name of property assignment, set breakpoint in the initializer
                                     if (node.parent.name === node &&
                                         !ts.isArrayLiteralOrObjectLiteralDestructuringPattern(node.parent.parent)) {
                                         return spanInNode(node.parent.initializer);
                                     }
                                     break;
-                                case 190:
+                                case 190 /* TypeAssertionExpression */:
+                                    // Breakpoint in type assertion goes to its operand
                                     if (node.parent.type === node) {
                                         return spanInNextNode(node.parent.type);
                                     }
                                     break;
-                                case 232:
-                                case 149: {
+                                case 232 /* VariableDeclaration */:
+                                case 149 /* Parameter */: {
+                                    // initializer of variable/parameter declaration go to previous node
                                     var _b = node.parent, initializer = _b.initializer, type = _b.type;
                                     if (initializer === node || type === node || ts.isAssignmentOperator(node.kind)) {
                                         return spanInPreviousNode(node);
                                     }
                                     break;
                                 }
-                                case 200: {
+                                case 200 /* BinaryExpression */: {
                                     var left = node.parent.left;
                                     if (ts.isArrayLiteralOrObjectLiteralDestructuringPattern(left) && node !== left) {
+                                        // If initializer of destructuring assignment move to previous token
                                         return spanInPreviousNode(node);
                                     }
                                     break;
                                 }
                                 default:
+                                    // return type of function go to previous token
                                     if (ts.isFunctionLike(node.parent) && node.parent.type === node) {
                                         return spanInPreviousNode(node);
                                     }
                             }
+                            // Default go to parent to set the breakpoint
                             return spanInNode(node.parent);
                     }
                 }
                 function textSpanFromVariableDeclaration(variableDeclaration) {
                     if (ts.isVariableDeclarationList(variableDeclaration.parent) && variableDeclaration.parent.declarations[0] === variableDeclaration) {
+                        // First declaration - include let keyword
                         return textSpan(ts.findPrecedingToken(variableDeclaration.pos, sourceFile, variableDeclaration.parent), variableDeclaration);
                     }
                     else {
+                        // Span only on this declaration
                         return textSpan(variableDeclaration);
                     }
                 }
                 function spanInVariableDeclaration(variableDeclaration) {
-                    if (variableDeclaration.parent.parent.kind === 221) {
+                    // If declaration of for in statement, just set the span in parent
+                    if (variableDeclaration.parent.parent.kind === 221 /* ForInStatement */) {
                         return spanInNode(variableDeclaration.parent.parent);
                     }
                     var parent = variableDeclaration.parent;
+                    // If this is a destructuring pattern, set breakpoint in binding pattern
                     if (ts.isBindingPattern(variableDeclaration.name)) {
                         return spanInBindingPattern(variableDeclaration.name);
                     }
+                    // Breakpoint is possible in variableDeclaration only if there is initialization
+                    // or its declaration from 'for of'
                     if (variableDeclaration.initializer ||
-                        ts.hasModifier(variableDeclaration, 1) ||
-                        parent.parent.kind === 222) {
+                        ts.hasModifier(variableDeclaration, 1 /* Export */) ||
+                        parent.parent.kind === 222 /* ForOfStatement */) {
                         return textSpanFromVariableDeclaration(variableDeclaration);
                     }
                     if (ts.isVariableDeclarationList(variableDeclaration.parent) &&
                         variableDeclaration.parent.declarations[0] !== variableDeclaration) {
+                        // If we cannot set breakpoint on this declaration, set it on previous one
+                        // Because the variable declaration may be binding pattern and
+                        // we would like to set breakpoint in last binding element if that's the case,
+                        // use preceding token instead
                         return spanInNode(ts.findPrecedingToken(variableDeclaration.pos, sourceFile, variableDeclaration.parent));
                     }
                 }
                 function canHaveSpanInParameterDeclaration(parameter) {
+                    // Breakpoint is possible on parameter only if it has initializer, is a rest parameter, or has public or private modifier
                     return !!parameter.initializer || parameter.dotDotDotToken !== undefined ||
-                        ts.hasModifier(parameter, 4 | 8);
+                        ts.hasModifier(parameter, 4 /* Public */ | 8 /* Private */);
                 }
                 function spanInParameterDeclaration(parameter) {
                     if (ts.isBindingPattern(parameter.name)) {
+                        // Set breakpoint in binding pattern
                         return spanInBindingPattern(parameter.name);
                     }
                     else if (canHaveSpanInParameterDeclaration(parameter)) {
@@ -91727,24 +110411,29 @@ var ts;
                         var indexOfParameter = functionDeclaration.parameters.indexOf(parameter);
                         ts.Debug.assert(indexOfParameter !== -1);
                         if (indexOfParameter !== 0) {
+                            // Not a first parameter, go to previous parameter
                             return spanInParameterDeclaration(functionDeclaration.parameters[indexOfParameter - 1]);
                         }
                         else {
+                            // Set breakpoint in the function declaration body
                             return spanInNode(functionDeclaration.body);
                         }
                     }
                 }
                 function canFunctionHaveSpanInWholeDeclaration(functionDeclaration) {
-                    return ts.hasModifier(functionDeclaration, 1) ||
-                        (functionDeclaration.parent.kind === 235 && functionDeclaration.kind !== 155);
+                    return ts.hasModifier(functionDeclaration, 1 /* Export */) ||
+                        (functionDeclaration.parent.kind === 235 /* ClassDeclaration */ && functionDeclaration.kind !== 155 /* Constructor */);
                 }
                 function spanInFunctionDeclaration(functionDeclaration) {
+                    // No breakpoints in the function signature
                     if (!functionDeclaration.body) {
                         return undefined;
                     }
                     if (canFunctionHaveSpanInWholeDeclaration(functionDeclaration)) {
+                        // Set the span on whole function declaration
                         return textSpan(functionDeclaration);
                     }
+                    // Set span in function body
                     return spanInNode(functionDeclaration.body);
                 }
                 function spanInFunctionBlock(block) {
@@ -91756,28 +110445,34 @@ var ts;
                 }
                 function spanInBlock(block) {
                     switch (block.parent.kind) {
-                        case 239:
-                            if (ts.getModuleInstanceState(block.parent) !== 1) {
+                        case 239 /* ModuleDeclaration */:
+                            if (ts.getModuleInstanceState(block.parent) !== 1 /* Instantiated */) {
                                 return undefined;
                             }
-                        case 219:
-                        case 217:
-                        case 221:
+                        // falls through
+                        // Set on parent if on same line otherwise on first statement
+                        case 219 /* WhileStatement */:
+                        case 217 /* IfStatement */:
+                        case 221 /* ForInStatement */:
                             return spanInNodeIfStartsOnSameLine(block.parent, block.statements[0]);
-                        case 220:
-                        case 222:
+                        // Set span on previous token if it starts on same line otherwise on the first statement of the block
+                        case 220 /* ForStatement */:
+                        case 222 /* ForOfStatement */:
                             return spanInNodeIfStartsOnSameLine(ts.findPrecedingToken(block.pos, sourceFile, block.parent), block.statements[0]);
                     }
+                    // Default action is to set on first statement
                     return spanInNode(block.statements[0]);
                 }
                 function spanInInitializerOfForLike(forLikeStatement) {
-                    if (forLikeStatement.initializer.kind === 233) {
+                    if (forLikeStatement.initializer.kind === 233 /* VariableDeclarationList */) {
+                        // Declaration list - set breakpoint in first declaration
                         var variableDeclarationList = forLikeStatement.initializer;
                         if (variableDeclarationList.declarations.length > 0) {
                             return spanInNode(variableDeclarationList.declarations[0]);
                         }
                     }
                     else {
+                        // Expression - set breakpoint in it
                         return spanInNode(forLikeStatement.initializer);
                     }
                 }
@@ -91793,64 +110488,82 @@ var ts;
                     }
                 }
                 function spanInBindingPattern(bindingPattern) {
-                    var firstBindingElement = ts.forEach(bindingPattern.elements, function (element) { return element.kind !== 206 ? element : undefined; });
+                    // Set breakpoint in first binding element
+                    var firstBindingElement = ts.forEach(bindingPattern.elements, function (element) { return element.kind !== 206 /* OmittedExpression */ ? element : undefined; });
                     if (firstBindingElement) {
                         return spanInNode(firstBindingElement);
                     }
-                    if (bindingPattern.parent.kind === 182) {
+                    // Empty binding pattern of binding element, set breakpoint on binding element
+                    if (bindingPattern.parent.kind === 182 /* BindingElement */) {
                         return textSpan(bindingPattern.parent);
                     }
+                    // Variable declaration is used as the span
                     return textSpanFromVariableDeclaration(bindingPattern.parent);
                 }
                 function spanInArrayLiteralOrObjectLiteralDestructuringPattern(node) {
-                    ts.Debug.assert(node.kind !== 181 && node.kind !== 180);
-                    var elements = node.kind === 183 ? node.elements : node.properties;
-                    var firstBindingElement = ts.forEach(elements, function (element) { return element.kind !== 206 ? element : undefined; });
+                    ts.Debug.assert(node.kind !== 181 /* ArrayBindingPattern */ && node.kind !== 180 /* ObjectBindingPattern */);
+                    var elements = node.kind === 183 /* ArrayLiteralExpression */ ? node.elements : node.properties;
+                    var firstBindingElement = ts.forEach(elements, function (element) { return element.kind !== 206 /* OmittedExpression */ ? element : undefined; });
                     if (firstBindingElement) {
                         return spanInNode(firstBindingElement);
                     }
-                    return textSpan(node.parent.kind === 200 ? node.parent : node);
+                    // Could be ArrayLiteral from destructuring assignment or
+                    // just nested element in another destructuring assignment
+                    // set breakpoint on assignment when parent is destructuring assignment
+                    // Otherwise set breakpoint for this element
+                    return textSpan(node.parent.kind === 200 /* BinaryExpression */ ? node.parent : node);
                 }
+                // Tokens:
                 function spanInOpenBraceToken(node) {
                     switch (node.parent.kind) {
-                        case 238:
+                        case 238 /* EnumDeclaration */:
                             var enumDeclaration = node.parent;
                             return spanInNodeIfStartsOnSameLine(ts.findPrecedingToken(node.pos, sourceFile, node.parent), enumDeclaration.members.length ? enumDeclaration.members[0] : enumDeclaration.getLastToken(sourceFile));
-                        case 235:
+                        case 235 /* ClassDeclaration */:
                             var classDeclaration = node.parent;
                             return spanInNodeIfStartsOnSameLine(ts.findPrecedingToken(node.pos, sourceFile, node.parent), classDeclaration.members.length ? classDeclaration.members[0] : classDeclaration.getLastToken(sourceFile));
-                        case 241:
+                        case 241 /* CaseBlock */:
                             return spanInNodeIfStartsOnSameLine(node.parent.parent, node.parent.clauses[0]);
                     }
+                    // Default to parent node
                     return spanInNode(node.parent);
                 }
                 function spanInCloseBraceToken(node) {
                     switch (node.parent.kind) {
-                        case 240:
-                            if (ts.getModuleInstanceState(node.parent.parent) !== 1) {
+                        case 240 /* ModuleBlock */:
+                            // If this is not an instantiated module block, no bp span
+                            if (ts.getModuleInstanceState(node.parent.parent) !== 1 /* Instantiated */) {
                                 return undefined;
                             }
-                        case 238:
-                        case 235:
+                        // falls through
+                        case 238 /* EnumDeclaration */:
+                        case 235 /* ClassDeclaration */:
+                            // Span on close brace token
                             return textSpan(node);
-                        case 213:
+                        case 213 /* Block */:
                             if (ts.isFunctionBlock(node.parent)) {
+                                // Span on close brace token
                                 return textSpan(node);
                             }
-                        case 269:
+                        // falls through
+                        case 269 /* CatchClause */:
                             return spanInNode(ts.lastOrUndefined(node.parent.statements));
-                        case 241:
+                        case 241 /* CaseBlock */:
+                            // breakpoint in last statement of the last clause
                             var caseBlock = node.parent;
                             var lastClause = ts.lastOrUndefined(caseBlock.clauses);
                             if (lastClause) {
                                 return spanInNode(ts.lastOrUndefined(lastClause.statements));
                             }
                             return undefined;
-                        case 180:
+                        case 180 /* ObjectBindingPattern */:
+                            // Breakpoint in last binding element or binding pattern if it contains no elements
                             var bindingPattern = node.parent;
                             return spanInNode(ts.lastOrUndefined(bindingPattern.elements) || bindingPattern);
+                        // Default to parent node
                         default:
                             if (ts.isArrayLiteralOrObjectLiteralDestructuringPattern(node.parent)) {
+                                // Breakpoint in last binding element or binding pattern if it contains no elements
                                 var objectLiteral = node.parent;
                                 return textSpan(ts.lastOrUndefined(objectLiteral.properties) || objectLiteral);
                             }
@@ -91859,74 +110572,85 @@ var ts;
                 }
                 function spanInCloseBracketToken(node) {
                     switch (node.parent.kind) {
-                        case 181:
+                        case 181 /* ArrayBindingPattern */:
+                            // Breakpoint in last binding element or binding pattern if it contains no elements
                             var bindingPattern = node.parent;
                             return textSpan(ts.lastOrUndefined(bindingPattern.elements) || bindingPattern);
                         default:
                             if (ts.isArrayLiteralOrObjectLiteralDestructuringPattern(node.parent)) {
+                                // Breakpoint in last binding element or binding pattern if it contains no elements
                                 var arrayLiteral = node.parent;
                                 return textSpan(ts.lastOrUndefined(arrayLiteral.elements) || arrayLiteral);
                             }
+                            // Default to parent node
                             return spanInNode(node.parent);
                     }
                 }
                 function spanInOpenParenToken(node) {
-                    if (node.parent.kind === 218 ||
-                        node.parent.kind === 187 ||
-                        node.parent.kind === 188) {
+                    if (node.parent.kind === 218 /* DoStatement */ || // Go to while keyword and do action instead
+                        node.parent.kind === 187 /* CallExpression */ ||
+                        node.parent.kind === 188 /* NewExpression */) {
                         return spanInPreviousNode(node);
                     }
-                    if (node.parent.kind === 191) {
+                    if (node.parent.kind === 191 /* ParenthesizedExpression */) {
                         return spanInNextNode(node);
                     }
+                    // Default to parent node
                     return spanInNode(node.parent);
                 }
                 function spanInCloseParenToken(node) {
+                    // Is this close paren token of parameter list, set span in previous token
                     switch (node.parent.kind) {
-                        case 192:
-                        case 234:
-                        case 193:
-                        case 154:
-                        case 153:
-                        case 156:
-                        case 157:
-                        case 155:
-                        case 219:
-                        case 218:
-                        case 220:
-                        case 222:
-                        case 187:
-                        case 188:
-                        case 191:
+                        case 192 /* FunctionExpression */:
+                        case 234 /* FunctionDeclaration */:
+                        case 193 /* ArrowFunction */:
+                        case 154 /* MethodDeclaration */:
+                        case 153 /* MethodSignature */:
+                        case 156 /* GetAccessor */:
+                        case 157 /* SetAccessor */:
+                        case 155 /* Constructor */:
+                        case 219 /* WhileStatement */:
+                        case 218 /* DoStatement */:
+                        case 220 /* ForStatement */:
+                        case 222 /* ForOfStatement */:
+                        case 187 /* CallExpression */:
+                        case 188 /* NewExpression */:
+                        case 191 /* ParenthesizedExpression */:
                             return spanInPreviousNode(node);
+                        // Default to parent node
                         default:
                             return spanInNode(node.parent);
                     }
                 }
                 function spanInColonToken(node) {
+                    // Is this : specifying return annotation of the function declaration
                     if (ts.isFunctionLike(node.parent) ||
-                        node.parent.kind === 270 ||
-                        node.parent.kind === 149) {
+                        node.parent.kind === 270 /* PropertyAssignment */ ||
+                        node.parent.kind === 149 /* Parameter */) {
                         return spanInPreviousNode(node);
                     }
                     return spanInNode(node.parent);
                 }
                 function spanInGreaterThanOrLessThanToken(node) {
-                    if (node.parent.kind === 190) {
+                    if (node.parent.kind === 190 /* TypeAssertionExpression */) {
                         return spanInNextNode(node);
                     }
                     return spanInNode(node.parent);
                 }
                 function spanInWhileKeyword(node) {
-                    if (node.parent.kind === 218) {
+                    if (node.parent.kind === 218 /* DoStatement */) {
+                        // Set span on while expression
                         return textSpanEndingAtNextToken(node, node.parent.expression);
                     }
+                    // Default to parent node
                     return spanInNode(node.parent);
                 }
                 function spanInOfKeyword(node) {
-                    if (node.parent.kind === 222) {
+                    if (node.parent.kind === 222 /* ForOfStatement */) {
+                        // Set using next token
                         return spanInNextNode(node);
                     }
+                    // Default to parent node
                     return spanInNode(node.parent);
                 }
             }
@@ -91936,17 +110660,42 @@ var ts;
 })(ts || (ts = {}));
 var ts;
 (function (ts) {
+    /**
+     * Transform one or more nodes using the supplied transformers.
+     * @param source A single `Node` or an array of `Node` objects.
+     * @param transformers An array of `TransformerFactory` callbacks used to process the transformation.
+     * @param compilerOptions Optional compiler options.
+     */
     function transform(source, transformers, compilerOptions) {
         var diagnostics = [];
-        compilerOptions = ts.fixupCompilerOptions(compilerOptions, diagnostics);
+        compilerOptions = ts.fixupCompilerOptions(compilerOptions, diagnostics); // TODO: GH#18217
         var nodes = ts.isArray(source) ? source : [source];
-        var result = ts.transformNodes(undefined, undefined, compilerOptions, nodes, transformers, true);
+        var result = ts.transformNodes(/*resolver*/ undefined, /*emitHost*/ undefined, compilerOptions, nodes, transformers, /*allowDtsFiles*/ true);
         result.diagnostics = ts.concatenate(result.diagnostics, diagnostics);
         return result;
     }
     ts.transform = transform;
 })(ts || (ts = {}));
+//
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+/* @internal */
 var debugObjectHost = (function () { return this; })();
+// We need to use 'null' to interface with the managed side.
+/* tslint:disable:no-null-keyword */
+/* tslint:disable:no-in-operator */
+/* @internal */
 var ts;
 (function (ts) {
     function logInternalError(logger, err) {
@@ -91954,7 +110703,7 @@ var ts;
             logger.log("*INTERNAL ERROR* - Exception in typescript services: " + err.message);
         }
     }
-    var ScriptSnapshotShimAdapter = (function () {
+    var ScriptSnapshotShimAdapter = /** @class */ (function () {
         function ScriptSnapshotShimAdapter(scriptSnapshotShim) {
             this.scriptSnapshotShim = scriptSnapshotShim;
         }
@@ -91968,30 +110717,34 @@ var ts;
             var oldSnapshotShim = oldSnapshot;
             var encoded = this.scriptSnapshotShim.getChangeRange(oldSnapshotShim.scriptSnapshotShim);
             if (encoded === null) {
-                return null;
+                return null; // TODO: GH#18217
             }
-            var decoded = JSON.parse(encoded);
+            var decoded = JSON.parse(encoded); // TODO: GH#18217
             return ts.createTextChangeRange(ts.createTextSpan(decoded.span.start, decoded.span.length), decoded.newLength);
         };
         ScriptSnapshotShimAdapter.prototype.dispose = function () {
+            // if scriptSnapshotShim is a COM object then property check becomes method call with no arguments
+            // 'in' does not have this effect
             if ("dispose" in this.scriptSnapshotShim) {
-                this.scriptSnapshotShim.dispose();
+                this.scriptSnapshotShim.dispose(); // TODO: GH#18217 Can we just use `if (this.scriptSnapshotShim.dispose)`?
             }
         };
         return ScriptSnapshotShimAdapter;
     }());
-    var LanguageServiceShimHostAdapter = (function () {
+    var LanguageServiceShimHostAdapter = /** @class */ (function () {
         function LanguageServiceShimHostAdapter(shimHost) {
             var _this = this;
             this.shimHost = shimHost;
             this.loggingEnabled = false;
             this.tracingEnabled = false;
+            // if shimHost is a COM object then property check will become method call with no arguments.
+            // 'in' does not have this effect.
             if ("getModuleResolutionsForFile" in this.shimHost) {
                 this.resolveModuleNames = function (moduleNames, containingFile) {
-                    var resolutionsInFile = JSON.parse(_this.shimHost.getModuleResolutionsForFile(containingFile));
+                    var resolutionsInFile = JSON.parse(_this.shimHost.getModuleResolutionsForFile(containingFile)); // TODO: GH#18217
                     return ts.map(moduleNames, function (name) {
                         var result = ts.getProperty(resolutionsInFile, name);
-                        return result ? { resolvedFileName: result, extension: ts.extensionFromPath(result), isExternalLibraryImport: false } : undefined;
+                        return result ? { resolvedFileName: result, extension: ts.extensionFromPath(result), isExternalLibraryImport: false } : undefined; // TODO: GH#18217
                     });
                 };
             }
@@ -92000,8 +110753,8 @@ var ts;
             }
             if ("getTypeReferenceDirectiveResolutionsForFile" in this.shimHost) {
                 this.resolveTypeReferenceDirectives = function (typeDirectiveNames, containingFile) {
-                    var typeDirectivesForFile = JSON.parse(_this.shimHost.getTypeReferenceDirectiveResolutionsForFile(containingFile));
-                    return ts.map(typeDirectiveNames, function (name) { return ts.getProperty(typeDirectivesForFile, name); });
+                    var typeDirectivesForFile = JSON.parse(_this.shimHost.getTypeReferenceDirectiveResolutionsForFile(containingFile)); // TODO: GH#18217
+                    return ts.map(typeDirectiveNames, function (name) { return ts.getProperty(typeDirectivesForFile, name); }); // TODO: GH#18217
                 };
             }
         }
@@ -92020,7 +110773,8 @@ var ts;
         };
         LanguageServiceShimHostAdapter.prototype.getProjectVersion = function () {
             if (!this.shimHost.getProjectVersion) {
-                return undefined;
+                // shimmed host does not support getProjectVersion
+                return undefined; // TODO: GH#18217
             }
             return this.shimHost.getProjectVersion();
         };
@@ -92039,6 +110793,7 @@ var ts;
                 throw Error("LanguageServiceShimHostAdapter.getCompilationSettings: empty compilationSettings");
             }
             var compilerOptions = JSON.parse(settingsJson);
+            // permit language service to handle all files (filtering should be performed on the host side)
             compilerOptions.allowNonTsExtensions = true;
             return compilerOptions;
         };
@@ -92052,10 +110807,10 @@ var ts;
         };
         LanguageServiceShimHostAdapter.prototype.getScriptKind = function (fileName) {
             if ("getScriptKind" in this.shimHost) {
-                return this.shimHost.getScriptKind(fileName);
+                return this.shimHost.getScriptKind(fileName); // TODO: GH#18217
             }
             else {
-                return 0;
+                return 0 /* Unknown */;
             }
         };
         LanguageServiceShimHostAdapter.prototype.getScriptVersion = function (fileName) {
@@ -92088,7 +110843,7 @@ var ts;
             return this.shimHost.getDefaultLibFileName(JSON.stringify(options));
         };
         LanguageServiceShimHostAdapter.prototype.readDirectory = function (path, extensions, exclude, include, depth) {
-            var pattern = ts.getFileMatcherPatterns(path, exclude, include, this.shimHost.useCaseSensitiveFileNames(), this.shimHost.getCurrentDirectory());
+            var pattern = ts.getFileMatcherPatterns(path, exclude, include, this.shimHost.useCaseSensitiveFileNames(), this.shimHost.getCurrentDirectory()); // TODO: GH#18217
             return JSON.parse(this.shimHost.readDirectory(path, JSON.stringify(extensions), JSON.stringify(pattern.basePaths), pattern.excludePattern, pattern.includeFilePattern, pattern.includeDirectoryPattern, depth));
         };
         LanguageServiceShimHostAdapter.prototype.readFile = function (path, encoding) {
@@ -92100,7 +110855,7 @@ var ts;
         return LanguageServiceShimHostAdapter;
     }());
     ts.LanguageServiceShimHostAdapter = LanguageServiceShimHostAdapter;
-    var CoreServicesShimHostAdapter = (function () {
+    var CoreServicesShimHostAdapter = /** @class */ (function () {
         function CoreServicesShimHostAdapter(shimHost) {
             var _this = this;
             this.shimHost = shimHost;
@@ -92109,11 +110864,11 @@ var ts;
                 this.directoryExists = function (directoryName) { return _this.shimHost.directoryExists(directoryName); };
             }
             if ("realpath" in this.shimHost) {
-                this.realpath = function (path) { return _this.shimHost.realpath(path); };
+                this.realpath = function (path) { return _this.shimHost.realpath(path); }; // TODO: GH#18217
             }
         }
         CoreServicesShimHostAdapter.prototype.readDirectory = function (rootDir, extensions, exclude, include, depth) {
-            var pattern = ts.getFileMatcherPatterns(rootDir, exclude, include, this.shimHost.useCaseSensitiveFileNames(), this.shimHost.getCurrentDirectory());
+            var pattern = ts.getFileMatcherPatterns(rootDir, exclude, include, this.shimHost.useCaseSensitiveFileNames(), this.shimHost.getCurrentDirectory()); // TODO: GH#18217
             return JSON.parse(this.shimHost.readDirectory(rootDir, JSON.stringify(extensions), JSON.stringify(pattern.basePaths), pattern.excludePattern, pattern.includeFilePattern, pattern.includeDirectoryPattern, depth));
         };
         CoreServicesShimHostAdapter.prototype.fileExists = function (fileName) {
@@ -92149,7 +110904,7 @@ var ts;
         return result;
     }
     function forwardJSONCall(logger, actionDescription, action, logPerformance) {
-        return forwardCall(logger, actionDescription, true, action, logPerformance);
+        return forwardCall(logger, actionDescription, /*returnJson*/ true, action, logPerformance);
     }
     function forwardCall(logger, actionDescription, returnJson, action, logPerformance) {
         try {
@@ -92165,7 +110920,7 @@ var ts;
             return JSON.stringify({ error: err });
         }
     }
-    var ShimBase = (function () {
+    var ShimBase = /** @class */ (function () {
         function ShimBase(factory) {
             this.factory = factory;
             factory.registerShim(this);
@@ -92189,7 +110944,7 @@ var ts;
             reportsUnnecessary: diagnostic.reportsUnnecessary,
         };
     }
-    var LanguageServiceShimObject = (function (_super) {
+    var LanguageServiceShimObject = /** @class */ (function (_super) {
         __extends(LanguageServiceShimObject, _super);
         function LanguageServiceShimObject(factory, host, languageService) {
             var _this = _super.call(this, factory) || this;
@@ -92202,10 +110957,16 @@ var ts;
         LanguageServiceShimObject.prototype.forwardJSONCall = function (actionDescription, action) {
             return forwardJSONCall(this.logger, actionDescription, action, this.logPerformance);
         };
+        /// DISPOSE
+        /**
+         * Ensure (almost) deterministic release of internal Javascript resources when
+         * some external native objects holds onto us (e.g. Com/Interop).
+         */
         LanguageServiceShimObject.prototype.dispose = function (dummy) {
             this.logger.log("dispose()");
             this.languageService.dispose();
             this.languageService = null;
+            // force a GC
             if (debugObjectHost && debugObjectHost.CollectGarbage) {
                 debugObjectHost.CollectGarbage();
                 this.logger.log("CollectGarbage()");
@@ -92213,6 +110974,10 @@ var ts;
             this.logger = null;
             _super.prototype.dispose.call(this, dummy);
         };
+        /// REFRESH
+        /**
+         * Update the list of scripts known to the compiler
+         */
         LanguageServiceShimObject.prototype.refresh = function (throwOnError) {
             this.forwardJSONCall("refresh(" + throwOnError + ")", function () { return null; });
         };
@@ -92237,11 +111002,17 @@ var ts;
         };
         LanguageServiceShimObject.prototype.getEncodedSyntacticClassifications = function (fileName, start, length) {
             var _this = this;
-            return this.forwardJSONCall("getEncodedSyntacticClassifications('" + fileName + "', " + start + ", " + length + ")", function () { return convertClassifications(_this.languageService.getEncodedSyntacticClassifications(fileName, ts.createTextSpan(start, length))); });
+            return this.forwardJSONCall("getEncodedSyntacticClassifications('" + fileName + "', " + start + ", " + length + ")", 
+            // directly serialize the spans out to a string.  This is much faster to decode
+            // on the managed side versus a full JSON array.
+            function () { return convertClassifications(_this.languageService.getEncodedSyntacticClassifications(fileName, ts.createTextSpan(start, length))); });
         };
         LanguageServiceShimObject.prototype.getEncodedSemanticClassifications = function (fileName, start, length) {
             var _this = this;
-            return this.forwardJSONCall("getEncodedSemanticClassifications('" + fileName + "', " + start + ", " + length + ")", function () { return convertClassifications(_this.languageService.getEncodedSemanticClassifications(fileName, ts.createTextSpan(start, length))); });
+            return this.forwardJSONCall("getEncodedSemanticClassifications('" + fileName + "', " + start + ", " + length + ")", 
+            // directly serialize the spans out to a string.  This is much faster to decode
+            // on the managed side versus a full JSON array.
+            function () { return convertClassifications(_this.languageService.getEncodedSemanticClassifications(fileName, ts.createTextSpan(start, length))); });
         };
         LanguageServiceShimObject.prototype.getSyntacticDiagnostics = function (fileName) {
             var _this = this;
@@ -92268,34 +111039,68 @@ var ts;
                 return _this.realizeDiagnostics(diagnostics);
             });
         };
+        /// QUICKINFO
+        /**
+         * Computes a string representation of the type at the requested position
+         * in the active file.
+         */
         LanguageServiceShimObject.prototype.getQuickInfoAtPosition = function (fileName, position) {
             var _this = this;
             return this.forwardJSONCall("getQuickInfoAtPosition('" + fileName + "', " + position + ")", function () { return _this.languageService.getQuickInfoAtPosition(fileName, position); });
         };
+        /// NAMEORDOTTEDNAMESPAN
+        /**
+         * Computes span information of the name or dotted name at the requested position
+         * in the active file.
+         */
         LanguageServiceShimObject.prototype.getNameOrDottedNameSpan = function (fileName, startPos, endPos) {
             var _this = this;
             return this.forwardJSONCall("getNameOrDottedNameSpan('" + fileName + "', " + startPos + ", " + endPos + ")", function () { return _this.languageService.getNameOrDottedNameSpan(fileName, startPos, endPos); });
         };
+        /**
+         * STATEMENTSPAN
+         * Computes span information of statement at the requested position in the active file.
+         */
         LanguageServiceShimObject.prototype.getBreakpointStatementAtPosition = function (fileName, position) {
             var _this = this;
             return this.forwardJSONCall("getBreakpointStatementAtPosition('" + fileName + "', " + position + ")", function () { return _this.languageService.getBreakpointStatementAtPosition(fileName, position); });
         };
+        /// SIGNATUREHELP
         LanguageServiceShimObject.prototype.getSignatureHelpItems = function (fileName, position) {
             var _this = this;
             return this.forwardJSONCall("getSignatureHelpItems('" + fileName + "', " + position + ")", function () { return _this.languageService.getSignatureHelpItems(fileName, position); });
         };
+        /// GOTO DEFINITION
+        /**
+         * Computes the definition location and file for the symbol
+         * at the requested position.
+         */
         LanguageServiceShimObject.prototype.getDefinitionAtPosition = function (fileName, position) {
             var _this = this;
             return this.forwardJSONCall("getDefinitionAtPosition('" + fileName + "', " + position + ")", function () { return _this.languageService.getDefinitionAtPosition(fileName, position); });
         };
+        /**
+         * Computes the definition location and file for the symbol
+         * at the requested position.
+         */
         LanguageServiceShimObject.prototype.getDefinitionAndBoundSpan = function (fileName, position) {
             var _this = this;
             return this.forwardJSONCall("getDefinitionAndBoundSpan('" + fileName + "', " + position + ")", function () { return _this.languageService.getDefinitionAndBoundSpan(fileName, position); });
         };
+        /// GOTO Type
+        /**
+         * Computes the definition location of the type of the symbol
+         * at the requested position.
+         */
         LanguageServiceShimObject.prototype.getTypeDefinitionAtPosition = function (fileName, position) {
             var _this = this;
             return this.forwardJSONCall("getTypeDefinitionAtPosition('" + fileName + "', " + position + ")", function () { return _this.languageService.getTypeDefinitionAtPosition(fileName, position); });
         };
+        /// GOTO Implementation
+        /**
+         * Computes the implementation location of the symbol
+         * at the requested position.
+         */
         LanguageServiceShimObject.prototype.getImplementationAtPosition = function (fileName, position) {
             var _this = this;
             return this.forwardJSONCall("getImplementationAtPosition('" + fileName + "', " + position + ")", function () { return _this.languageService.getImplementationAtPosition(fileName, position); });
@@ -92308,6 +111113,7 @@ var ts;
             var _this = this;
             return this.forwardJSONCall("findRenameLocations('" + fileName + "', " + position + ", " + findInStrings + ", " + findInComments + ")", function () { return _this.languageService.findRenameLocations(fileName, position, findInStrings, findInComments); });
         };
+        /// GET BRACE MATCHING
         LanguageServiceShimObject.prototype.getBraceMatchingAtPosition = function (fileName, position) {
             var _this = this;
             return this.forwardJSONCall("getBraceMatchingAtPosition('" + fileName + "', " + position + ")", function () { return _this.languageService.getBraceMatchingAtPosition(fileName, position); });
@@ -92320,13 +111126,15 @@ var ts;
             var _this = this;
             return this.forwardJSONCall("getSpanOfEnclosingComment('" + fileName + "', " + position + ")", function () { return _this.languageService.getSpanOfEnclosingComment(fileName, position, onlyMultiLine); });
         };
-        LanguageServiceShimObject.prototype.getIndentationAtPosition = function (fileName, position, options) {
+        /// GET SMART INDENT
+        LanguageServiceShimObject.prototype.getIndentationAtPosition = function (fileName, position, options /*Services.EditorOptions*/) {
             var _this = this;
             return this.forwardJSONCall("getIndentationAtPosition('" + fileName + "', " + position + ")", function () {
                 var localOptions = JSON.parse(options);
                 return _this.languageService.getIndentationAtPosition(fileName, position, localOptions);
             });
         };
+        /// GET REFERENCES
         LanguageServiceShimObject.prototype.getReferencesAtPosition = function (fileName, position) {
             var _this = this;
             return this.forwardJSONCall("getReferencesAtPosition('" + fileName + "', " + position + ")", function () { return _this.languageService.getReferencesAtPosition(fileName, position); });
@@ -92343,14 +111151,22 @@ var ts;
             var _this = this;
             return this.forwardJSONCall("getDocumentHighlights('" + fileName + "', " + position + ")", function () {
                 var results = _this.languageService.getDocumentHighlights(fileName, position, JSON.parse(filesToSearch));
+                // workaround for VS document highlighting issue - keep only items from the initial file
                 var normalizedName = ts.normalizeSlashes(fileName).toLowerCase();
                 return ts.filter(results, function (r) { return ts.normalizeSlashes(r.fileName).toLowerCase() === normalizedName; });
             });
         };
+        /// COMPLETION LISTS
+        /**
+         * Get a string based representation of the completions
+         * to provide at the given source position and providing a member completion
+         * list if requested.
+         */
         LanguageServiceShimObject.prototype.getCompletionsAtPosition = function (fileName, position, preferences) {
             var _this = this;
             return this.forwardJSONCall("getCompletionsAtPosition('" + fileName + "', " + position + ", " + preferences + ")", function () { return _this.languageService.getCompletionsAtPosition(fileName, position, preferences); });
         };
+        /** Get a string based representation of a completion list entry details */
         LanguageServiceShimObject.prototype.getCompletionEntryDetails = function (fileName, position, entryName, formatOptions, source, preferences) {
             var _this = this;
             return this.forwardJSONCall("getCompletionEntryDetails('" + fileName + "', " + position + ", '" + entryName + "')", function () {
@@ -92358,21 +111174,21 @@ var ts;
                 return _this.languageService.getCompletionEntryDetails(fileName, position, entryName, localOptions, source, preferences);
             });
         };
-        LanguageServiceShimObject.prototype.getFormattingEditsForRange = function (fileName, start, end, options) {
+        LanguageServiceShimObject.prototype.getFormattingEditsForRange = function (fileName, start, end, options /*Services.FormatCodeOptions*/) {
             var _this = this;
             return this.forwardJSONCall("getFormattingEditsForRange('" + fileName + "', " + start + ", " + end + ")", function () {
                 var localOptions = JSON.parse(options);
                 return _this.languageService.getFormattingEditsForRange(fileName, start, end, localOptions);
             });
         };
-        LanguageServiceShimObject.prototype.getFormattingEditsForDocument = function (fileName, options) {
+        LanguageServiceShimObject.prototype.getFormattingEditsForDocument = function (fileName, options /*Services.FormatCodeOptions*/) {
             var _this = this;
             return this.forwardJSONCall("getFormattingEditsForDocument('" + fileName + "')", function () {
                 var localOptions = JSON.parse(options);
                 return _this.languageService.getFormattingEditsForDocument(fileName, localOptions);
             });
         };
-        LanguageServiceShimObject.prototype.getFormattingEditsAfterKeystroke = function (fileName, position, key, options) {
+        LanguageServiceShimObject.prototype.getFormattingEditsAfterKeystroke = function (fileName, position, key, options /*Services.FormatCodeOptions*/) {
             var _this = this;
             return this.forwardJSONCall("getFormattingEditsAfterKeystroke('" + fileName + "', " + position + ", '" + key + "')", function () {
                 var localOptions = JSON.parse(options);
@@ -92383,6 +111199,8 @@ var ts;
             var _this = this;
             return this.forwardJSONCall("getDocCommentTemplateAtPosition('" + fileName + "', " + position + ")", function () { return _this.languageService.getDocCommentTemplateAtPosition(fileName, position); });
         };
+        /// NAVIGATE TO
+        /** Return a list of symbols that are interesting to navigate to */
         LanguageServiceShimObject.prototype.getNavigateToItems = function (searchValue, maxResultCount, fileName) {
             var _this = this;
             return this.forwardJSONCall("getNavigateToItems('" + searchValue + "', " + maxResultCount + ", " + fileName + ")", function () { return _this.languageService.getNavigateToItems(searchValue, maxResultCount, fileName); });
@@ -92403,20 +111221,22 @@ var ts;
             var _this = this;
             return this.forwardJSONCall("getTodoComments('" + fileName + "')", function () { return _this.languageService.getTodoComments(fileName, JSON.parse(descriptors)); });
         };
+        /// Emit
         LanguageServiceShimObject.prototype.getEmitOutput = function (fileName) {
             var _this = this;
             return this.forwardJSONCall("getEmitOutput('" + fileName + "')", function () { return _this.languageService.getEmitOutput(fileName); });
         };
         LanguageServiceShimObject.prototype.getEmitOutputObject = function (fileName) {
             var _this = this;
-            return forwardCall(this.logger, "getEmitOutput('" + fileName + "')", false, function () { return _this.languageService.getEmitOutput(fileName); }, this.logPerformance);
+            return forwardCall(this.logger, "getEmitOutput('" + fileName + "')", 
+            /*returnJson*/ false, function () { return _this.languageService.getEmitOutput(fileName); }, this.logPerformance);
         };
         return LanguageServiceShimObject;
     }(ShimBase));
     function convertClassifications(classifications) {
         return { spans: classifications.spans.join(","), endOfLineState: classifications.endOfLineState };
     }
-    var ClassifierShimObject = (function (_super) {
+    var ClassifierShimObject = /** @class */ (function (_super) {
         __extends(ClassifierShimObject, _super);
         function ClassifierShimObject(factory, logger) {
             var _this = _super.call(this, factory) || this;
@@ -92430,6 +111250,7 @@ var ts;
             if (syntacticClassifierAbsent === void 0) { syntacticClassifierAbsent = false; }
             return forwardJSONCall(this.logger, "getEncodedLexicalClassifications", function () { return convertClassifications(_this.classifier.getEncodedLexicalClassifications(text, lexState, syntacticClassifierAbsent)); }, this.logPerformance);
         };
+        /// COLORIZATION
         ClassifierShimObject.prototype.getClassificationsForLine = function (text, lexState, classifyKeywordsInGenerics) {
             if (classifyKeywordsInGenerics === void 0) { classifyKeywordsInGenerics = false; }
             var classification = this.classifier.getClassificationsForLine(text, lexState, classifyKeywordsInGenerics);
@@ -92444,7 +111265,7 @@ var ts;
         };
         return ClassifierShimObject;
     }(ShimBase));
-    var CoreServicesShimObject = (function (_super) {
+    var CoreServicesShimObject = /** @class */ (function (_super) {
         __extends(CoreServicesShimObject, _super);
         function CoreServicesShimObject(factory, logger, host) {
             var _this = _super.call(this, factory) || this;
@@ -92462,7 +111283,7 @@ var ts;
                 var compilerOptions = JSON.parse(compilerOptionsJson);
                 var result = ts.resolveModuleName(moduleName, ts.normalizeSlashes(fileName), compilerOptions, _this.host);
                 var resolvedFileName = result.resolvedModule ? result.resolvedModule.resolvedFileName : undefined;
-                if (result.resolvedModule && result.resolvedModule.extension !== ".ts" && result.resolvedModule.extension !== ".tsx" && result.resolvedModule.extension !== ".d.ts") {
+                if (result.resolvedModule && result.resolvedModule.extension !== ".ts" /* Ts */ && result.resolvedModule.extension !== ".tsx" /* Tsx */ && result.resolvedModule.extension !== ".d.ts" /* Dts */) {
                     resolvedFileName = undefined;
                 }
                 return {
@@ -92486,13 +111307,15 @@ var ts;
         CoreServicesShimObject.prototype.getPreProcessedFileInfo = function (fileName, sourceTextSnapshot) {
             var _this = this;
             return this.forwardJSONCall("getPreProcessedFileInfo('" + fileName + "')", function () {
-                var result = ts.preProcessFile(ts.getSnapshotText(sourceTextSnapshot), true, true);
+                // for now treat files as JavaScript
+                var result = ts.preProcessFile(ts.getSnapshotText(sourceTextSnapshot), /* readImportFiles */ true, /* detectJavaScriptImports */ true);
                 return {
                     referencedFiles: _this.convertFileReferences(result.referencedFiles),
                     importedFiles: _this.convertFileReferences(result.importedFiles),
                     ambientExternalModules: result.ambientExternalModules,
                     isLibFile: result.isLibFile,
-                    typeReferenceDirectives: _this.convertFileReferences(result.typeReferenceDirectives)
+                    typeReferenceDirectives: _this.convertFileReferences(result.typeReferenceDirectives),
+                    libReferenceDirectives: _this.convertFileReferences(result.libReferenceDirectives)
                 };
             });
         };
@@ -92508,8 +111331,8 @@ var ts;
                 return undefined;
             }
             var result = [];
-            for (var _i = 0, refs_2 = refs; _i < refs_2.length; _i++) {
-                var ref = refs_2[_i];
+            for (var _i = 0, refs_1 = refs; _i < refs_1.length; _i++) {
+                var ref = refs_1[_i];
                 result.push({
                     path: ts.normalizeSlashes(ref.fileName),
                     position: ref.pos,
@@ -92523,7 +111346,7 @@ var ts;
             return this.forwardJSONCall("getTSConfigFileInfo('" + fileName + "')", function () {
                 var result = ts.parseJsonText(fileName, ts.getSnapshotText(sourceTextSnapshot));
                 var normalizedFileName = ts.normalizeSlashes(fileName);
-                var configFile = ts.parseJsonSourceFileConfigFileContent(result, _this.host, ts.getDirectoryPath(normalizedFileName), {}, normalizedFileName);
+                var configFile = ts.parseJsonSourceFileConfigFileContent(result, _this.host, ts.getDirectoryPath(normalizedFileName), /*existingOptions*/ {}, normalizedFileName);
                 return {
                     options: configFile.options,
                     typeAcquisition: configFile.typeAcquisition,
@@ -92538,7 +111361,7 @@ var ts;
         };
         CoreServicesShimObject.prototype.discoverTypings = function (discoverTypingsJson) {
             var _this = this;
-            var getCanonicalFileName = ts.createGetCanonicalFileName(false);
+            var getCanonicalFileName = ts.createGetCanonicalFileName(/*useCaseSensitivefileNames:*/ false);
             return this.forwardJSONCall("discoverTypings()", function () {
                 var info = JSON.parse(discoverTypingsJson);
                 if (_this.safeList === undefined) {
@@ -92549,10 +111372,13 @@ var ts;
         };
         return CoreServicesShimObject;
     }(ShimBase));
-    var TypeScriptServicesFactory = (function () {
+    var TypeScriptServicesFactory = /** @class */ (function () {
         function TypeScriptServicesFactory() {
             this._shims = [];
         }
+        /*
+         * Returns script API version.
+         */
         TypeScriptServicesFactory.prototype.getServicesVersion = function () {
             return ts.servicesVersion;
         };
@@ -92562,7 +111388,7 @@ var ts;
                     this.documentRegistry = ts.createDocumentRegistry(host.useCaseSensitiveFileNames && host.useCaseSensitiveFileNames(), host.getCurrentDirectory());
                 }
                 var hostAdapter = new LanguageServiceShimHostAdapter(host);
-                var languageService = ts.createLanguageService(hostAdapter, this.documentRegistry, false);
+                var languageService = ts.createLanguageService(hostAdapter, this.documentRegistry, /*syntaxOnly*/ false);
                 return new LanguageServiceShimObject(this, host, languageService);
             }
             catch (err) {
@@ -92590,6 +111416,7 @@ var ts;
             }
         };
         TypeScriptServicesFactory.prototype.close = function () {
+            // Forget all the registered shims
             ts.clear(this._shims);
             this.documentRegistry = undefined;
         };
@@ -92612,6 +111439,10 @@ var ts;
         module.exports = ts;
     }
 })(ts || (ts = {}));
+/* tslint:enable:no-in-operator */
+/* tslint:enable:no-null */
+/// TODO: this is used by VS, clean this up on both sides of the interface
+/* @internal */
 var TypeScript;
 (function (TypeScript) {
     var Services;
@@ -92619,11 +111450,17 @@ var TypeScript;
         Services.TypeScriptServicesFactory = ts.TypeScriptServicesFactory;
     })(Services = TypeScript.Services || (TypeScript.Services = {}));
 })(TypeScript || (TypeScript = {}));
+// 'toolsVersion' gets consumed by the managed side, so it's not unused.
+// TODO: it should be moved into a namespace though.
+/* @internal */
 var toolsVersion = ts.versionMajorMinor;
+//# sourceMappingURL=services.js.map
+"use strict";
 var ts;
 (function (ts) {
     var server;
     (function (server) {
+        // tslint:disable variable-name
         server.ActionSet = "action::set";
         server.ActionInvalidate = "action::invalidate";
         server.ActionPackageInstalled = "action::packageInstalled";
@@ -92638,6 +111475,10 @@ var ts;
             Arguments.EnableTelemetry = "--enableTelemetry";
             Arguments.TypingSafeListLocation = "--typingSafeListLocation";
             Arguments.TypesMapLocation = "--typesMapLocation";
+            /**
+             * This argument specifies the location of the NPM executable.
+             * typingsInstaller will run the command with `${npmLocation} install ...`.
+             */
             Arguments.NpmLocation = "--npmLocation";
         })(Arguments = server.Arguments || (server.Arguments = {}));
         function hasArgument(argumentName) {
@@ -92651,13 +111492,397 @@ var ts;
                 : undefined;
         }
         server.findArgument = findArgument;
+        /*@internal*/
         function nowString() {
+            // E.g. "12:34:56.789"
             var d = new Date();
             return d.getHours() + ":" + d.getMinutes() + ":" + d.getSeconds() + "." + d.getMilliseconds();
         }
         server.nowString = nowString;
     })(server = ts.server || (ts.server = {}));
 })(ts || (ts = {}));
+/* @internal */
+var ts;
+(function (ts) {
+    var JsTyping;
+    (function (JsTyping) {
+        /* @internal */
+        function isTypingUpToDate(cachedTyping, availableTypingVersions) {
+            var availableVersion = ts.Semver.parse(ts.getProperty(availableTypingVersions, "ts" + ts.versionMajorMinor) || ts.getProperty(availableTypingVersions, "latest"));
+            return !availableVersion.greaterThan(cachedTyping.version);
+        }
+        JsTyping.isTypingUpToDate = isTypingUpToDate;
+        /* @internal */
+        JsTyping.nodeCoreModuleList = [
+            "assert",
+            "async_hooks",
+            "buffer",
+            "child_process",
+            "cluster",
+            "console",
+            "constants",
+            "crypto",
+            "dgram",
+            "dns",
+            "domain",
+            "events",
+            "fs",
+            "http",
+            "https",
+            "http2",
+            "inspector",
+            "net",
+            "os",
+            "path",
+            "perf_hooks",
+            "process",
+            "punycode",
+            "querystring",
+            "readline",
+            "repl",
+            "stream",
+            "string_decoder",
+            "timers",
+            "tls",
+            "tty",
+            "url",
+            "util",
+            "v8",
+            "vm",
+            "zlib"
+        ];
+        /* @internal */
+        JsTyping.nodeCoreModules = ts.arrayToSet(JsTyping.nodeCoreModuleList);
+        function loadSafeList(host, safeListPath) {
+            var result = ts.readConfigFile(safeListPath, function (path) { return host.readFile(path); });
+            return ts.createMapFromTemplate(result.config);
+        }
+        JsTyping.loadSafeList = loadSafeList;
+        function loadTypesMap(host, typesMapPath) {
+            var result = ts.readConfigFile(typesMapPath, function (path) { return host.readFile(path); });
+            if (result.config) {
+                return ts.createMapFromTemplate(result.config.simpleMap);
+            }
+            return undefined;
+        }
+        JsTyping.loadTypesMap = loadTypesMap;
+        /**
+         * @param host is the object providing I/O related operations.
+         * @param fileNames are the file names that belong to the same project
+         * @param projectRootPath is the path to the project root directory
+         * @param safeListPath is the path used to retrieve the safe list
+         * @param packageNameToTypingLocation is the map of package names to their cached typing locations and installed versions
+         * @param typeAcquisition is used to customize the typing acquisition process
+         * @param compilerOptions are used as a source for typing inference
+         */
+        function discoverTypings(host, log, fileNames, projectRootPath, safeList, packageNameToTypingLocation, typeAcquisition, unresolvedImports, typesRegistry) {
+            if (!typeAcquisition || !typeAcquisition.enable) {
+                return { cachedTypingPaths: [], newTypingNames: [], filesToWatch: [] };
+            }
+            // A typing name to typing file path mapping
+            var inferredTypings = ts.createMap();
+            // Only infer typings for .js and .jsx files
+            fileNames = ts.mapDefined(fileNames, function (fileName) {
+                var path = ts.normalizePath(fileName);
+                if (ts.hasJavaScriptFileExtension(path)) {
+                    return path;
+                }
+            });
+            var filesToWatch = [];
+            if (typeAcquisition.include)
+                addInferredTypings(typeAcquisition.include, "Explicitly included types");
+            var exclude = typeAcquisition.exclude || [];
+            // Directories to search for package.json, bower.json and other typing information
+            var possibleSearchDirs = ts.arrayToSet(fileNames, ts.getDirectoryPath);
+            possibleSearchDirs.set(projectRootPath, true);
+            possibleSearchDirs.forEach(function (_true, searchDir) {
+                var packageJsonPath = ts.combinePaths(searchDir, "package.json");
+                getTypingNamesFromJson(packageJsonPath, filesToWatch);
+                var bowerJsonPath = ts.combinePaths(searchDir, "bower.json");
+                getTypingNamesFromJson(bowerJsonPath, filesToWatch);
+                var bowerComponentsPath = ts.combinePaths(searchDir, "bower_components");
+                getTypingNamesFromPackagesFolder(bowerComponentsPath, filesToWatch);
+                var nodeModulesPath = ts.combinePaths(searchDir, "node_modules");
+                getTypingNamesFromPackagesFolder(nodeModulesPath, filesToWatch);
+            });
+            getTypingNamesFromSourceFileNames(fileNames);
+            // add typings for unresolved imports
+            if (unresolvedImports) {
+                var module_1 = ts.deduplicate(unresolvedImports.map(function (moduleId) { return JsTyping.nodeCoreModules.has(moduleId) ? "node" : moduleId; }), ts.equateStringsCaseSensitive, ts.compareStringsCaseSensitive);
+                addInferredTypings(module_1, "Inferred typings from unresolved imports");
+            }
+            // Add the cached typing locations for inferred typings that are already installed
+            packageNameToTypingLocation.forEach(function (typing, name) {
+                var registryEntry = typesRegistry.get(name);
+                if (inferredTypings.has(name) && inferredTypings.get(name) === undefined && registryEntry !== undefined && isTypingUpToDate(typing, registryEntry)) {
+                    inferredTypings.set(name, typing.typingLocation);
+                }
+            });
+            // Remove typings that the user has added to the exclude list
+            for (var _i = 0, exclude_1 = exclude; _i < exclude_1.length; _i++) {
+                var excludeTypingName = exclude_1[_i];
+                var didDelete = inferredTypings.delete(excludeTypingName);
+                if (didDelete && log)
+                    log("Typing for " + excludeTypingName + " is in exclude list, will be ignored.");
+            }
+            var newTypingNames = [];
+            var cachedTypingPaths = [];
+            inferredTypings.forEach(function (inferred, typing) {
+                if (inferred !== undefined) {
+                    cachedTypingPaths.push(inferred);
+                }
+                else {
+                    newTypingNames.push(typing);
+                }
+            });
+            var result = { cachedTypingPaths: cachedTypingPaths, newTypingNames: newTypingNames, filesToWatch: filesToWatch };
+            if (log)
+                log("Result: " + JSON.stringify(result));
+            return result;
+            function addInferredTyping(typingName) {
+                if (!inferredTypings.has(typingName)) {
+                    inferredTypings.set(typingName, undefined); // TODO: GH#18217
+                }
+            }
+            function addInferredTypings(typingNames, message) {
+                if (log)
+                    log(message + ": " + JSON.stringify(typingNames));
+                ts.forEach(typingNames, addInferredTyping);
+            }
+            /**
+             * Get the typing info from common package manager json files like package.json or bower.json
+             */
+            function getTypingNamesFromJson(jsonPath, filesToWatch) {
+                if (!host.fileExists(jsonPath)) {
+                    return;
+                }
+                filesToWatch.push(jsonPath);
+                var jsonConfig = ts.readConfigFile(jsonPath, function (path) { return host.readFile(path); }).config;
+                var jsonTypingNames = ts.flatMap([jsonConfig.dependencies, jsonConfig.devDependencies, jsonConfig.optionalDependencies, jsonConfig.peerDependencies], ts.getOwnKeys);
+                addInferredTypings(jsonTypingNames, "Typing names in '" + jsonPath + "' dependencies");
+            }
+            /**
+             * Infer typing names from given file names. For example, the file name "jquery-min.2.3.4.js"
+             * should be inferred to the 'jquery' typing name; and "angular-route.1.2.3.js" should be inferred
+             * to the 'angular-route' typing name.
+             * @param fileNames are the names for source files in the project
+             */
+            function getTypingNamesFromSourceFileNames(fileNames) {
+                var fromFileNames = ts.mapDefined(fileNames, function (j) {
+                    if (!ts.hasJavaScriptFileExtension(j))
+                        return undefined;
+                    var inferredTypingName = ts.removeFileExtension(ts.getBaseFileName(j.toLowerCase()));
+                    var cleanedTypingName = ts.removeMinAndVersionNumbers(inferredTypingName);
+                    return safeList.get(cleanedTypingName);
+                });
+                if (fromFileNames.length) {
+                    addInferredTypings(fromFileNames, "Inferred typings from file names");
+                }
+                var hasJsxFile = ts.some(fileNames, function (f) { return ts.fileExtensionIs(f, ".jsx" /* Jsx */); });
+                if (hasJsxFile) {
+                    if (log)
+                        log("Inferred 'react' typings due to presence of '.jsx' extension");
+                    addInferredTyping("react");
+                }
+            }
+            /**
+             * Infer typing names from packages folder (ex: node_module, bower_components)
+             * @param packagesFolderPath is the path to the packages folder
+             */
+            function getTypingNamesFromPackagesFolder(packagesFolderPath, filesToWatch) {
+                filesToWatch.push(packagesFolderPath);
+                // Todo: add support for ModuleResolutionHost too
+                if (!host.directoryExists(packagesFolderPath)) {
+                    return;
+                }
+                // depth of 2, so we access `node_modules/foo` but not `node_modules/foo/bar`
+                var fileNames = host.readDirectory(packagesFolderPath, [".json" /* Json */], /*excludes*/ undefined, /*includes*/ undefined, /*depth*/ 2);
+                if (log)
+                    log("Searching for typing names in " + packagesFolderPath + "; all files: " + JSON.stringify(fileNames));
+                var packageNames = [];
+                for (var _i = 0, fileNames_1 = fileNames; _i < fileNames_1.length; _i++) {
+                    var fileName = fileNames_1[_i];
+                    var normalizedFileName = ts.normalizePath(fileName);
+                    var baseFileName = ts.getBaseFileName(normalizedFileName);
+                    if (baseFileName !== "package.json" && baseFileName !== "bower.json") {
+                        continue;
+                    }
+                    var result_1 = ts.readConfigFile(normalizedFileName, function (path) { return host.readFile(path); });
+                    var packageJson = result_1.config;
+                    // npm 3's package.json contains a "_requiredBy" field
+                    // we should include all the top level module names for npm 2, and only module names whose
+                    // "_requiredBy" field starts with "#" or equals "/" for npm 3.
+                    if (baseFileName === "package.json" && packageJson._requiredBy &&
+                        ts.filter(packageJson._requiredBy, function (r) { return r[0] === "#" || r === "/"; }).length === 0) {
+                        continue;
+                    }
+                    // If the package has its own d.ts typings, those will take precedence. Otherwise the package name will be used
+                    // to download d.ts files from DefinitelyTyped
+                    if (!packageJson.name) {
+                        continue;
+                    }
+                    var ownTypes = packageJson.types || packageJson.typings;
+                    if (ownTypes) {
+                        var absolutePath = ts.getNormalizedAbsolutePath(ownTypes, ts.getDirectoryPath(normalizedFileName));
+                        if (log)
+                            log("    Package '" + packageJson.name + "' provides its own types.");
+                        inferredTypings.set(packageJson.name, absolutePath);
+                    }
+                    else {
+                        packageNames.push(packageJson.name);
+                    }
+                }
+                addInferredTypings(packageNames, "    Found package names");
+            }
+        }
+        JsTyping.discoverTypings = discoverTypings;
+        var PackageNameValidationResult;
+        (function (PackageNameValidationResult) {
+            PackageNameValidationResult[PackageNameValidationResult["Ok"] = 0] = "Ok";
+            PackageNameValidationResult[PackageNameValidationResult["ScopedPackagesNotSupported"] = 1] = "ScopedPackagesNotSupported";
+            PackageNameValidationResult[PackageNameValidationResult["EmptyName"] = 2] = "EmptyName";
+            PackageNameValidationResult[PackageNameValidationResult["NameTooLong"] = 3] = "NameTooLong";
+            PackageNameValidationResult[PackageNameValidationResult["NameStartsWithDot"] = 4] = "NameStartsWithDot";
+            PackageNameValidationResult[PackageNameValidationResult["NameStartsWithUnderscore"] = 5] = "NameStartsWithUnderscore";
+            PackageNameValidationResult[PackageNameValidationResult["NameContainsNonURISafeCharacters"] = 6] = "NameContainsNonURISafeCharacters";
+        })(PackageNameValidationResult = JsTyping.PackageNameValidationResult || (JsTyping.PackageNameValidationResult = {}));
+        var maxPackageNameLength = 214;
+        /**
+         * Validates package name using rules defined at https://docs.npmjs.com/files/package.json
+         */
+        function validatePackageName(packageName) {
+            if (!packageName) {
+                return 2 /* EmptyName */;
+            }
+            if (packageName.length > maxPackageNameLength) {
+                return 3 /* NameTooLong */;
+            }
+            if (packageName.charCodeAt(0) === 46 /* dot */) {
+                return 4 /* NameStartsWithDot */;
+            }
+            if (packageName.charCodeAt(0) === 95 /* _ */) {
+                return 5 /* NameStartsWithUnderscore */;
+            }
+            // check if name is scope package like: starts with @ and has one '/' in the middle
+            // scoped packages are not currently supported
+            // TODO: when support will be added we'll need to split and check both scope and package name
+            if (/^@[^/]+\/[^/]+$/.test(packageName)) {
+                return 1 /* ScopedPackagesNotSupported */;
+            }
+            if (encodeURIComponent(packageName) !== packageName) {
+                return 6 /* NameContainsNonURISafeCharacters */;
+            }
+            return 0 /* Ok */;
+        }
+        JsTyping.validatePackageName = validatePackageName;
+        function renderPackageNameValidationFailure(result, typing) {
+            switch (result) {
+                case 2 /* EmptyName */:
+                    return "Package name '" + typing + "' cannot be empty";
+                case 3 /* NameTooLong */:
+                    return "Package name '" + typing + "' should be less than " + maxPackageNameLength + " characters";
+                case 4 /* NameStartsWithDot */:
+                    return "Package name '" + typing + "' cannot start with '.'";
+                case 5 /* NameStartsWithUnderscore */:
+                    return "Package name '" + typing + "' cannot start with '_'";
+                case 1 /* ScopedPackagesNotSupported */:
+                    return "Package '" + typing + "' is scoped and currently is not supported";
+                case 6 /* NameContainsNonURISafeCharacters */:
+                    return "Package name '" + typing + "' contains non URI safe characters";
+                case 0 /* Ok */:
+                    return ts.Debug.fail(); // Shouldn't have called this.
+                default:
+                    throw ts.Debug.assertNever(result);
+            }
+        }
+        JsTyping.renderPackageNameValidationFailure = renderPackageNameValidationFailure;
+    })(JsTyping = ts.JsTyping || (ts.JsTyping = {}));
+})(ts || (ts = {}));
+/* @internal */
+var ts;
+(function (ts) {
+    function stringToInt(str) {
+        var n = parseInt(str, 10);
+        if (isNaN(n)) {
+            throw new Error("Error in parseInt(" + JSON.stringify(str) + ")");
+        }
+        return n;
+    }
+    var isPrereleaseRegex = /^(.*)-next.\d+/;
+    var prereleaseSemverRegex = /^(\d+)\.(\d+)\.0-next.(\d+)$/;
+    var semverRegex = /^(\d+)\.(\d+)\.(\d+)$/;
+    var Semver = /** @class */ (function () {
+        function Semver(major, minor, patch, 
+        /**
+         * If true, this is `major.minor.0-next.patch`.
+         * If false, this is `major.minor.patch`.
+         */
+        isPrerelease) {
+            this.major = major;
+            this.minor = minor;
+            this.patch = patch;
+            this.isPrerelease = isPrerelease;
+        }
+        Semver.parse = function (semver) {
+            var isPrerelease = isPrereleaseRegex.test(semver);
+            var result = Semver.tryParse(semver, isPrerelease);
+            if (!result) {
+                throw new Error("Unexpected semver: " + semver + " (isPrerelease: " + isPrerelease + ")");
+            }
+            return result;
+        };
+        Semver.fromRaw = function (_a) {
+            var major = _a.major, minor = _a.minor, patch = _a.patch, isPrerelease = _a.isPrerelease;
+            return new Semver(major, minor, patch, isPrerelease);
+        };
+        // This must parse the output of `versionString`.
+        Semver.tryParse = function (semver, isPrerelease) {
+            // Per the semver spec <http://semver.org/#spec-item-2>:
+            // "A normal version number MUST take the form X.Y.Z where X, Y, and Z are non-negative integers, and MUST NOT contain leading zeroes."
+            var rgx = isPrerelease ? prereleaseSemverRegex : semverRegex;
+            var match = rgx.exec(semver);
+            return match ? new Semver(stringToInt(match[1]), stringToInt(match[2]), stringToInt(match[3]), isPrerelease) : undefined;
+        };
+        Object.defineProperty(Semver.prototype, "versionString", {
+            get: function () {
+                return this.isPrerelease ? this.major + "." + this.minor + ".0-next." + this.patch : this.major + "." + this.minor + "." + this.patch;
+            },
+            enumerable: true,
+            configurable: true
+        });
+        Semver.prototype.equals = function (sem) {
+            return this.major === sem.major && this.minor === sem.minor && this.patch === sem.patch && this.isPrerelease === sem.isPrerelease;
+        };
+        Semver.prototype.greaterThan = function (sem) {
+            return this.major > sem.major || this.major === sem.major
+                && (this.minor > sem.minor || this.minor === sem.minor
+                    && (!this.isPrerelease && sem.isPrerelease || this.isPrerelease === sem.isPrerelease
+                        && this.patch > sem.patch));
+        };
+        return Semver;
+    }());
+    ts.Semver = Semver;
+})(ts || (ts = {}));
+//# sourceMappingURL=jsTyping.js.map
+"use strict";
+var __assign = (this && this.__assign) || Object.assign || function(t) {
+    for (var s, i = 1, n = arguments.length; i < n; i++) {
+        s = arguments[i];
+        for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
+            t[p] = s[p];
+    }
+    return t;
+};
+var __extends = (this && this.__extends) || (function () {
+    var extendStatics = Object.setPrototypeOf ||
+        ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
+        function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
+    return function (d, b) {
+        extendStatics(d, b);
+        function __() { this.constructor = d; }
+        d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
+    };
+})();
 var ts;
 (function (ts) {
     var server;
@@ -93829,6 +113054,10 @@ var ts;
                 }
                 return this.program.getSourceFileByPath(path);
             };
+            Project.prototype.getSourceFileOrConfigFile = function (path) {
+                var options = this.program.getCompilerOptions();
+                return path === options.configFilePath ? options.configFile : this.getSourceFile(path);
+            };
             Project.prototype.close = function () {
                 var _this = this;
                 if (this.program) {
@@ -93889,8 +113118,8 @@ var ts;
                     return this.rootFiles;
                 }
                 return ts.map(this.program.getSourceFiles(), function (sourceFile) {
-                    var scriptInfo = _this.projectService.getScriptInfoForPath(sourceFile.path);
-                    ts.Debug.assert(!!scriptInfo, "getScriptInfo", function () { return "scriptInfo for a file '" + sourceFile.fileName + "' Path: '" + sourceFile.path + "' is missing."; });
+                    var scriptInfo = _this.projectService.getScriptInfoForPath(sourceFile.resolvedPath || sourceFile.path);
+                    ts.Debug.assert(!!scriptInfo, "getScriptInfo", function () { return "scriptInfo for a file '" + sourceFile.fileName + "' Path: '" + sourceFile.path + "' / '" + sourceFile.resolvedPath + "' is missing."; });
                     return scriptInfo;
                 });
             };
@@ -94159,8 +113388,8 @@ var ts;
                 var sourceFiles = this.program.getSourceFiles();
                 var strBuilder = "\tFiles (" + sourceFiles.length + ")\n";
                 if (writeProjectFileNames) {
-                    for (var _i = 0, sourceFiles_8 = sourceFiles; _i < sourceFiles_8.length; _i++) {
-                        var file = sourceFiles_8[_i];
+                    for (var _i = 0, sourceFiles_1 = sourceFiles; _i < sourceFiles_1.length; _i++) {
+                        var file = sourceFiles_1[_i];
                         strBuilder += "\t" + file.fileName + "\n";
                     }
                 }
@@ -94238,7 +113467,7 @@ var ts;
                 }
                 var searchPaths = [ts.combinePaths(this.projectService.getExecutingFilePath(), "../../..")].concat(this.projectService.pluginProbeLocations);
                 if (this.projectService.globalPlugins) {
-                    var _loop_26 = function (globalPluginName) {
+                    var _loop_1 = function (globalPluginName) {
                         if (!globalPluginName)
                             return "continue";
                         if (options.plugins && options.plugins.some(function (p) { return p.name === globalPluginName; }))
@@ -94249,7 +113478,7 @@ var ts;
                     var this_1 = this;
                     for (var _i = 0, _a = this.projectService.globalPlugins; _i < _a.length; _i++) {
                         var globalPluginName = _a[_i];
-                        _loop_26(globalPluginName);
+                        _loop_1(globalPluginName);
                     }
                 }
             };
@@ -95045,7 +114274,7 @@ var ts;
                 }
                 project.updateGraph();
                 if (!this.useSingleInferredProject && !project.projectRootPath) {
-                    var _loop_27 = function (inferredProject) {
+                    var _loop_2 = function (inferredProject) {
                         if (inferredProject === project || inferredProject.isOrphan()) {
                             return "continue";
                         }
@@ -95057,7 +114286,7 @@ var ts;
                     };
                     for (var _i = 0, _a = this.inferredProjects; _i < _a.length; _i++) {
                         var inferredProject = _a[_i];
-                        _loop_27(inferredProject);
+                        _loop_2(inferredProject);
                     }
                 }
                 return project;
@@ -95369,8 +114598,8 @@ var ts;
                 this.projectToSizeMap.set(name, 0);
                 this.projectToSizeMap.forEach(function (val) { return (availableSpace -= (val || 0)); });
                 var totalNonTsFileSize = 0;
-                for (var _i = 0, fileNames_2 = fileNames; _i < fileNames_2.length; _i++) {
-                    var f = fileNames_2[_i];
+                for (var _i = 0, fileNames_1 = fileNames; _i < fileNames_1.length; _i++) {
+                    var f = fileNames_1[_i];
                     var fileName = propertyReader.getFileName(f);
                     if (ts.hasTypeScriptFileExtension(fileName)) {
                         continue;
@@ -95473,8 +114702,8 @@ var ts;
             ProjectService.prototype.updateNonInferredProjectFiles = function (project, files, propertyReader) {
                 var projectRootFilesMap = project.getRootFilesMap();
                 var newRootScriptInfoMap = ts.createMap();
-                for (var _i = 0, files_4 = files; _i < files_4.length; _i++) {
-                    var f = files_4[_i];
+                for (var _i = 0, files_1 = files; _i < files_1.length; _i++) {
+                    var f = files_1[_i];
                     var newRootFile = propertyReader.getFileName(f);
                     var normalizedPath = server.toNormalizedPath(newRootFile);
                     var isDynamic = server.isDynamicFileName(normalizedPath);
@@ -95640,7 +114869,7 @@ var ts;
                 return projects;
                 function combineProjects(toAddInfo) {
                     if (toAddInfo !== info) {
-                        var _loop_28 = function (project) {
+                        var _loop_3 = function (project) {
                             if (project.languageServiceEnabled &&
                                 !project.isOrphan() &&
                                 !project.getCompilerOptions().preserveSymlinks &&
@@ -95656,7 +114885,7 @@ var ts;
                         };
                         for (var _i = 0, _a = toAddInfo.containingProjects; _i < _a.length; _i++) {
                             var project = _a[_i];
-                            _loop_28(project);
+                            _loop_3(project);
                         }
                     }
                 }
@@ -95901,13 +115130,13 @@ var ts;
                 this.printProjects();
             };
             ProjectService.prototype.collectChanges = function (lastKnownProjectVersions, currentProjects, result) {
-                var _loop_29 = function (proj) {
+                var _loop_4 = function (proj) {
                     var knownProject = ts.find(lastKnownProjectVersions, function (p) { return p.projectName === proj.getProjectName(); });
                     result.push(proj.getChangesSinceVersion(knownProject && knownProject.version));
                 };
                 for (var _i = 0, currentProjects_1 = currentProjects; _i < currentProjects_1.length; _i++) {
                     var proj = currentProjects_1[_i];
-                    _loop_29(proj);
+                    _loop_4(proj);
                 }
             };
             ProjectService.prototype.synchronizeProjectList = function (knownProjects) {
@@ -96008,7 +115237,7 @@ var ts;
                 var excludeRules = [];
                 var normalizedNames = rootFiles.map(function (f) { return ts.normalizeSlashes(f.fileName); });
                 var excludedFiles = [];
-                var _loop_30 = function (name) {
+                var _loop_5 = function (name) {
                     var rule = this_2.safelist[name];
                     for (var _i = 0, normalizedNames_1 = normalizedNames; _i < normalizedNames_1.length; _i++) {
                         var root = normalizedNames_1[_i];
@@ -96023,7 +115252,7 @@ var ts;
                                 }
                             }
                             if (rule.exclude) {
-                                var _loop_32 = function (exclude) {
+                                var _loop_7 = function (exclude) {
                                     var processedRule = root.replace(rule.match, function () {
                                         var groups = [];
                                         for (var _i = 0; _i < arguments.length; _i++) {
@@ -96046,7 +115275,7 @@ var ts;
                                 };
                                 for (var _c = 0, _d = rule.exclude; _c < _d.length; _c++) {
                                     var exclude = _d[_c];
-                                    _loop_32(exclude);
+                                    _loop_7(exclude);
                                 }
                             }
                             else {
@@ -96061,11 +115290,11 @@ var ts;
                 var this_2 = this;
                 for (var _i = 0, _a = Object.keys(this.safelist); _i < _a.length; _i++) {
                     var name = _a[_i];
-                    _loop_30(name);
+                    _loop_5(name);
                 }
                 var excludeRegexes = excludeRules.map(function (e) { return new RegExp(e, "i"); });
                 var filesToKeep = [];
-                var _loop_31 = function (i) {
+                var _loop_6 = function (i) {
                     if (excludeRegexes.some(function (re) { return re.test(normalizedNames[i]); })) {
                         excludedFiles.push(normalizedNames[i]);
                     }
@@ -96099,7 +115328,7 @@ var ts;
                 };
                 var this_3 = this;
                 for (var i = 0; i < proj.rootFiles.length; i++) {
-                    _loop_31(i);
+                    _loop_6(i);
                 }
                 proj.rootFiles = filesToKeep;
                 return excludedFiles;
@@ -96279,8 +115508,8 @@ var ts;
                 { start: start, end: end, text: text, code: code, category: category, reportsUnnecessary: diag.reportsUnnecessary, source: source };
         }
         function allEditsBeforePos(edits, pos) {
-            for (var _i = 0, edits_2 = edits; _i < edits_2.length; _i++) {
-                var edit = edits_2[_i];
+            for (var _i = 0, edits_1 = edits; _i < edits_1.length; _i++) {
+                var edit = edits_1[_i];
                 if (ts.textSpanEnd(edit.span) >= pos) {
                     return false;
                 }
@@ -97663,6 +116892,7 @@ var ts;
                     kind: tree.kind,
                     kindModifiers: tree.kindModifiers,
                     spans: tree.spans.map(function (span) { return _this.toLocationTextSpan(span, scriptInfo); }),
+                    nameSpan: tree.nameSpan && this.toLocationTextSpan(tree.nameSpan, scriptInfo),
                     childItems: ts.map(tree.childItems, function (item) { return _this.toLocationNavigationTree(item, scriptInfo); })
                 };
             };
@@ -97880,20 +117110,10 @@ var ts;
             };
             Session.prototype.mapTextChangesToCodeEdits = function (project, textChanges) {
                 var _this = this;
-                return textChanges.map(function (change) { return _this.mapTextChangesToCodeEditsUsingScriptinfo(change, project.getScriptInfoForNormalizedPath(server.toNormalizedPath(change.fileName))); });
-            };
-            Session.prototype.mapTextChangesToCodeEditsUsingScriptinfo = function (textChanges, scriptInfo) {
-                var _this = this;
-                ts.Debug.assert(!!textChanges.isNewFile === !scriptInfo);
-                if (scriptInfo) {
-                    return {
-                        fileName: textChanges.fileName,
-                        textChanges: textChanges.textChanges.map(function (textChange) { return _this.convertTextChangeToCodeEdit(textChange, scriptInfo); })
-                    };
-                }
-                else {
-                    return this.convertNewFileTextChangeToCodeEdit(textChanges);
-                }
+                return textChanges.map(function (change) {
+                    var path = server.normalizedPathToPath(server.toNormalizedPath(change.fileName), _this.host.getCurrentDirectory(), function (fileName) { return _this.getCanonicalFileName(fileName); });
+                    return mapTextChangesToCodeEdits(change, project.getSourceFileOrConfigFile(path));
+                });
             };
             Session.prototype.convertTextChangeToCodeEdit = function (change, scriptInfo) {
                 return {
@@ -97902,12 +117122,6 @@ var ts;
                     newText: change.newText ? change.newText : ""
                 };
             };
-            Session.prototype.convertNewFileTextChangeToCodeEdit = function (textChanges) {
-                ts.Debug.assert(textChanges.textChanges.length === 1);
-                var change = ts.first(textChanges.textChanges);
-                ts.Debug.assert(change.span.start === 0 && change.span.length === 0);
-                return { fileName: textChanges.fileName, textChanges: [{ start: { line: 0, offset: 0 }, end: { line: 0, offset: 0 }, newText: change.newText }] };
-            };
             Session.prototype.getBraceMatching = function (args, simplifiedResult) {
                 var _this = this;
                 var _a = this.getFileAndLanguageServiceForSyntacticOperation(args), file = _a.file, languageService = _a.languageService;
@@ -98056,6 +117270,31 @@ var ts;
             return Session;
         }());
         server.Session = Session;
+        function mapTextChangesToCodeEdits(textChanges, sourceFile) {
+            ts.Debug.assert(!!textChanges.isNewFile === !sourceFile);
+            if (sourceFile) {
+                return {
+                    fileName: textChanges.fileName,
+                    textChanges: textChanges.textChanges.map(function (textChange) { return convertTextChangeToCodeEdit(textChange, sourceFile); }),
+                };
+            }
+            else {
+                return convertNewFileTextChangeToCodeEdit(textChanges);
+            }
+        }
+        function convertTextChangeToCodeEdit(change, sourceFile) {
+            return {
+                start: convertToLocation(sourceFile.getLineAndCharacterOfPosition(change.span.start)),
+                end: convertToLocation(sourceFile.getLineAndCharacterOfPosition(change.span.start + change.span.length)),
+                newText: change.newText ? change.newText : "",
+            };
+        }
+        function convertNewFileTextChangeToCodeEdit(textChanges) {
+            ts.Debug.assert(textChanges.textChanges.length === 1);
+            var change = ts.first(textChanges.textChanges);
+            ts.Debug.assert(change.span.start === 0 && change.span.length === 0);
+            return { fileName: textChanges.fileName, textChanges: [{ start: { line: 0, offset: 0 }, end: { line: 0, offset: 0 }, newText: change.newText }] };
+        }
         function getLocationInNewDocument(oldText, renameFilename, renameLocation, edits) {
             var newText = applyEdits(oldText, renameFilename, edits);
             var _a = ts.computeLineAndCharacterOfPosition(ts.computeLineStarts(newText), renameLocation), line = _a.line, character = _a.character;
@@ -98063,14 +117302,14 @@ var ts;
         }
         server.getLocationInNewDocument = getLocationInNewDocument;
         function applyEdits(text, textFilename, edits) {
-            for (var _i = 0, edits_3 = edits; _i < edits_3.length; _i++) {
-                var _a = edits_3[_i], fileName = _a.fileName, textChanges_4 = _a.textChanges;
+            for (var _i = 0, edits_2 = edits; _i < edits_2.length; _i++) {
+                var _a = edits_2[_i], fileName = _a.fileName, textChanges_1 = _a.textChanges;
                 if (fileName !== textFilename) {
                     continue;
                 }
-                for (var i = textChanges_4.length - 1; i >= 0; i--) {
-                    var _b = textChanges_4[i], newText = _b.newText, _c = _b.span, start = _c.start, length_6 = _c.length;
-                    text = text.slice(0, start) + newText + text.slice(start + length_6);
+                for (var i = textChanges_1.length - 1; i >= 0; i--) {
+                    var _b = textChanges_1[i], newText = _b.newText, _c = _b.span, start = _c.start, length_1 = _c.length;
+                    text = text.slice(0, start) + newText + text.slice(start + length_1);
                 }
             }
             return text;
@@ -98799,6 +118038,8 @@ var ts;
         }());
     })(server = ts.server || (ts.server = {}));
 })(ts || (ts = {}));
+//# sourceMappingURL=server.js.map
+// tslint:disable no-unnecessary-type-assertion (TODO: tslint can't find node types)
 var ts;
 (function (ts) {
     var server;
@@ -98850,7 +118091,7 @@ var ts;
             output: process.stdout,
             terminal: false,
         });
-        var Logger = (function () {
+        var Logger = /** @class */ (function () {
             function Logger(logFilename, traceToConsole, level) {
                 this.logFilename = logFilename;
                 this.traceToConsole = traceToConsole;
@@ -98864,6 +118105,7 @@ var ts;
                         this.fd = fs.openSync(this.logFilename, "w");
                     }
                     catch (_) {
+                        // swallow the error and keep logging disabled if file cannot be opened
                     }
                 }
             }
@@ -98924,7 +118166,8 @@ var ts;
             Logger.prototype.write = function (s) {
                 if (this.fd >= 0) {
                     var buf = new Buffer(s);
-                    fs.writeSync(this.fd, buf, 0, buf.length, null);
+                    // tslint:disable-next-line no-null-keyword
+                    fs.writeSync(this.fd, buf, 0, buf.length, /*position*/ null); // TODO: GH#18217
                 }
                 if (this.traceToConsole) {
                     console.warn(s);
@@ -98932,7 +118175,7 @@ var ts;
             };
             return Logger;
         }());
-        var NodeTypingsInstaller = (function () {
+        var NodeTypingsInstaller = /** @class */ (function () {
             function NodeTypingsInstaller(telemetryEnabled, logger, host, globalTypingsCacheLocation, typingSafeListLocation, typesMapLocation, npmLocation, event) {
                 this.telemetryEnabled = telemetryEnabled;
                 this.logger = logger;
@@ -98944,11 +118187,12 @@ var ts;
                 this.event = event;
                 this.activeRequestCount = 0;
                 this.requestQueue = [];
-                this.requestMap = ts.createMap();
+                this.requestMap = ts.createMap(); // Maps operation ID to newest requestQueue entry with that ID
             }
             NodeTypingsInstaller.prototype.isKnownTypesPackageName = function (name) {
+                // We want to avoid looking this up in the registry as that is expensive. So first check that it's actually an NPM package.
                 var validationResult = ts.JsTyping.validatePackageName(name);
-                if (validationResult !== 0) {
+                if (validationResult !== 0 /* Ok */) {
                     return false;
                 }
                 if (this.requestedRegistry) {
@@ -98994,6 +118238,8 @@ var ts;
                     var arg = _a[_i];
                     var match = /^--((?:debug|inspect)(?:-brk)?)(?:=(\d+))?$/.exec(arg);
                     if (match) {
+                        // if port is specified - use port + 1
+                        // otherwise pick a default port depending on if 'debug' or 'inspect' and use its value + 1
                         var currentPort = match[2] !== undefined
                             ? +match[2]
                             : match[1].charAt(0) === "d" ? 5858 : 9229;
@@ -99059,6 +118305,7 @@ var ts;
                         }
                         this.packageInstalledPromise = undefined;
                         this.projectService.updateTypingsForProject(response);
+                        // The behavior is the same as for setTypings, so send the same event.
                         this.event(response, "setTypings");
                         break;
                     }
@@ -99143,11 +118390,16 @@ var ts;
                 this.activeRequestCount++;
                 this.host.setTimeout(request.operation, NodeTypingsInstaller.requestDelayMillis);
             };
+            // This number is essentially arbitrary.  Processing more than one typings request
+            // at a time makes sense, but having too many in the pipe results in a hang
+            // (see https://github.com/nodejs/node/issues/7657).
+            // It would be preferable to base our limit on the amount of space left in the
+            // buffer, but we have yet to find a way to retrieve that value.
             NodeTypingsInstaller.maxActiveRequestCount = 10;
             NodeTypingsInstaller.requestDelayMillis = 100;
             return NodeTypingsInstaller;
         }());
-        var IOSession = (function (_super) {
+        var IOSession = /** @class */ (function (_super) {
             __extends(IOSession, _super);
             function IOSession() {
                 var _this = this;
@@ -99156,6 +118408,10 @@ var ts;
                         _this.event(body, eventName);
                     }
                     else {
+                        // It is unsafe to dereference `this` before initialization completes,
+                        // so we defer until the next tick.
+                        //
+                        // Construction should finish before the next tick fires, so we do not need to do this recursively.
                         setImmediate(function () { return _this.event(body, eventName); });
                     }
                 };
@@ -99185,6 +118441,7 @@ var ts;
                     var s_1 = net.connect({ port: _this.eventPort }, function () {
                         _this.eventSocket = s_1;
                         if (_this.socketEventQueue) {
+                            // flush queue.
                             for (var _i = 0, _a = _this.socketEventQueue; _i < _a.length; _i++) {
                                 var event_1 = _a[_i];
                                 _this.writeToEventSocket(event_1.body, event_1.eventName);
@@ -99268,13 +118525,13 @@ var ts;
             function getEntireValue(initialIndex) {
                 var pathStart = args[initialIndex];
                 var extraPartCounter = 0;
-                if (pathStart.charCodeAt(0) === 34 &&
-                    pathStart.charCodeAt(pathStart.length - 1) !== 34) {
+                if (pathStart.charCodeAt(0) === 34 /* doubleQuote */ &&
+                    pathStart.charCodeAt(pathStart.length - 1) !== 34 /* doubleQuote */) {
                     for (var i = initialIndex + 1; i < args.length; i++) {
                         pathStart += " ";
                         pathStart += args[i];
                         extraPartCounter++;
-                        if (pathStart.charCodeAt(pathStart.length - 1) === 34)
+                        if (pathStart.charCodeAt(pathStart.length - 1) === 34 /* doubleQuote */)
                             break;
                     }
                 }
@@ -99292,6 +118549,7 @@ var ts;
             }
             return undefined;
         }
+        // TSS_LOG "{ level: "normal | verbose | terse", file?: string}"
         function createLogger() {
             var cmdLineLogFileName = server.findArgument("--logFile");
             var cmdLineVerbosity = getLogLevel(server.findArgument("--logVerbosity"));
@@ -99302,8 +118560,12 @@ var ts;
                     ? envLogOptions.file || (__dirname + "/.log" + process.pid.toString())
                     : undefined;
             var logVerbosity = cmdLineVerbosity || envLogOptions.detailLevel;
-            return new Logger(logFileName, envLogOptions.traceToConsole, logVerbosity);
+            return new Logger(logFileName, envLogOptions.traceToConsole, logVerbosity); // TODO: GH#18217
         }
+        // This places log file in the directory containing editorServices.js
+        // TODO: check that this location is writable
+        // average async stat takes about 30 microseconds
+        // set chunk size to do 30 files in < 1 millisecond
         function createPollingWatchedFileSet(interval, chunkSize) {
             if (interval === void 0) { interval = 2500; }
             if (chunkSize === void 0) { chunkSize = 30; }
@@ -99335,6 +118597,9 @@ var ts;
                     }
                 });
             }
+            // this implementation uses polling and
+            // stat due to inconsistencies of fs.watch
+            // and efficiency of stat on modern filesystems
             function startWatchTimer() {
                 setInterval(function () {
                     var count = 0;
@@ -99360,7 +118625,7 @@ var ts;
                     callback: callback,
                     mtime: sys.fileExists(fileName)
                         ? getModifiedTime(fileName)
-                        : ts.missingFileModifiedTime
+                        : ts.missingFileModifiedTime // Any subsequent modification will occur after this time
                 };
                 watchedFiles.push(file);
                 if (watchedFiles.length === 1) {
@@ -99372,6 +118637,19 @@ var ts;
                 ts.unorderedRemoveItem(watchedFiles, file);
             }
         }
+        // REVIEW: for now this implementation uses polling.
+        // The advantage of polling is that it works reliably
+        // on all os and with network mounted files.
+        // For 90 referenced files, the average time to detect
+        // changes is 2*msInterval (by default 5 seconds).
+        // The overhead of this is .04 percent (1/2500) with
+        // average pause of < 1 millisecond (and max
+        // pause less than 1.5 milliseconds); question is
+        // do we anticipate reference sets in the 100s and
+        // do we care about waiting 10-20 seconds to detect
+        // changes for large reference sets? If so, do we want
+        // to increase the chunk size or decrease the interval
+        // time dynamically to match the large reference set?
         var pollingWatchedFileSet = createPollingWatchedFileSet();
         var pending = [];
         var canWrite = true;
@@ -99393,30 +118671,40 @@ var ts;
         function extractWatchDirectoryCacheKey(path, currentDriveKey) {
             path = ts.normalizeSlashes(path);
             if (isUNCPath(path)) {
+                // UNC path: extract server name
+                // //server/location
+                //         ^ <- from 0 to this position
                 var firstSlash = path.indexOf(ts.directorySeparator, 2);
                 return firstSlash !== -1 ? path.substring(0, firstSlash).toLowerCase() : path;
             }
             var rootLength = ts.getRootLength(path);
             if (rootLength === 0) {
+                // relative path - assume file is on the current drive
                 return currentDriveKey;
             }
-            if (path.charCodeAt(1) === 58 && path.charCodeAt(2) === 47) {
+            if (path.charCodeAt(1) === 58 /* colon */ && path.charCodeAt(2) === 47 /* slash */) {
+                // rooted path that starts with c:/... - extract drive letter
                 return path.charAt(0).toLowerCase();
             }
-            if (path.charCodeAt(0) === 47 && path.charCodeAt(1) !== 47) {
+            if (path.charCodeAt(0) === 47 /* slash */ && path.charCodeAt(1) !== 47 /* slash */) {
+                // rooted path that starts with slash - /somename - use key for current drive
                 return currentDriveKey;
             }
+            // do not cache any other cases
             return undefined;
         }
         function isUNCPath(s) {
-            return s.length > 2 && s.charCodeAt(0) === 47 && s.charCodeAt(1) === 47;
+            return s.length > 2 && s.charCodeAt(0) === 47 /* slash */ && s.charCodeAt(1) === 47 /* slash */;
         }
         var logger = createLogger();
         var sys = ts.sys;
         var nodeVersion = ts.getNodeMajorVersion();
+        // use watchGuard process on Windows when node version is 4 or later
         var useWatchGuard = process.platform === "win32" && nodeVersion >= 4;
         var originalWatchDirectory = sys.watchDirectory.bind(sys);
         var noopWatcher = { close: ts.noop };
+        // This is the function that catches the exceptions when watching directory, and yet lets project service continue to function
+        // Eg. on linux the number of watches are limited and one could easily exhaust watches and the exception ENOSPC is thrown when creating watcher at that point
         function watchDirectorySwallowingException(path, callback, recursive) {
             try {
                 return originalWatchDirectory(path, callback, recursive);
@@ -99427,7 +118715,7 @@ var ts;
             }
         }
         if (useWatchGuard) {
-            var currentDrive_1 = extractWatchDirectoryCacheKey(sys.resolvePath(sys.getCurrentDirectory()), undefined);
+            var currentDrive_1 = extractWatchDirectoryCacheKey(sys.resolvePath(sys.getCurrentDirectory()), /*currentDriveKey*/ undefined);
             var statusCache_1 = ts.createMap();
             sys.watchDirectory = function (path, callback, recursive) {
                 var cacheKey = extractWatchDirectoryCacheKey(path, currentDrive_1);
@@ -99461,9 +118749,11 @@ var ts;
                     logger.info("watchDirectory for " + path + " uses cached drive information.");
                 }
                 if (status) {
+                    // this drive is safe to use - call real 'watchDirectory'
                     return watchDirectorySwallowingException(path, callback, recursive);
                 }
                 else {
+                    // this drive is unsafe - return no-op watcher
                     return noopWatcher;
                 }
             };
@@ -99471,6 +118761,7 @@ var ts;
         else {
             sys.watchDirectory = watchDirectorySwallowingException;
         }
+        // Override sys.write because fs.writeSync is not reliable on Node 4
         sys.write = function (s) { return writeMessage(new Buffer(s, "utf8")); };
         sys.watchFile = function (fileName, callback) {
             var watchedFile = pollingWatchedFileSet.addFile(fileName, callback);
@@ -99514,7 +118805,7 @@ var ts;
             ts.validateLocaleAndSetLanguage(localeStr, sys);
         }
         ts.setStackTraceLimit();
-        var typingSafeListLocation = server.findArgument(server.Arguments.TypingSafeListLocation);
+        var typingSafeListLocation = server.findArgument(server.Arguments.TypingSafeListLocation); // TODO: GH#18217
         var typesMapLocation = server.findArgument(server.Arguments.TypesMapLocation) || ts.combinePaths(sys.getExecutingFilePath(), "../typesMap.json");
         var npmLocation = server.findArgument(server.Arguments.NpmLocation);
         function parseStringArray(argName) {
@@ -99542,7 +118833,11 @@ var ts;
         process.on("uncaughtException", function (err) {
             ioSession.logError(err, "unknown");
         });
+        // See https://github.com/Microsoft/TypeScript/issues/11348
+        // tslint:disable-next-line no-unnecessary-type-assertion-2
         process.noAsar = true;
+        // Start listening
         ioSession.listen();
     })(server = ts.server || (ts.server = {}));
 })(ts || (ts = {}));
+//# sourceMappingURL=tsserver.js.map
\ No newline at end of file
diff --git a/lib/tsserverlibrary.d.ts b/lib/tsserverlibrary.d.ts
index 76a5d890fa7..2cfb99444e5 100644
--- a/lib/tsserverlibrary.d.ts
+++ b/lib/tsserverlibrary.d.ts
@@ -715,10 +715,14 @@ declare namespace ts {
         kind: SyntaxKind.ThisType;
     }
     type FunctionOrConstructorTypeNode = FunctionTypeNode | ConstructorTypeNode;
-    interface FunctionTypeNode extends TypeNode, SignatureDeclarationBase {
+    interface FunctionOrConstructorTypeNodeBase extends TypeNode, SignatureDeclarationBase {
+        kind: SyntaxKind.FunctionType | SyntaxKind.ConstructorType;
+        type: TypeNode;
+    }
+    interface FunctionTypeNode extends FunctionOrConstructorTypeNodeBase {
         kind: SyntaxKind.FunctionType;
     }
-    interface ConstructorTypeNode extends TypeNode, SignatureDeclarationBase {
+    interface ConstructorTypeNode extends FunctionOrConstructorTypeNodeBase {
         kind: SyntaxKind.ConstructorType;
     }
     interface NodeWithTypeArguments extends TypeNode {
@@ -1648,6 +1652,7 @@ declare namespace ts {
         moduleName?: string;
         referencedFiles: ReadonlyArray<FileReference>;
         typeReferenceDirectives: ReadonlyArray<FileReference>;
+        libReferenceDirectives: ReadonlyArray<FileReference>;
         languageVariant: LanguageVariant;
         isDeclarationFile: boolean;
         /**
@@ -1669,11 +1674,14 @@ declare namespace ts {
     interface InputFiles extends Node {
         kind: SyntaxKind.InputFiles;
         javascriptText: string;
+        javascriptMapText?: string;
         declarationText: string;
+        declarationMapText?: string;
     }
     interface UnparsedSource extends Node {
         kind: SyntaxKind.UnparsedSource;
         text: string;
+        sourceMapText?: string;
     }
     interface JsonSourceFile extends SourceFile {
         statements: NodeArray<JsonObjectExpressionStatement>;
@@ -2656,6 +2664,9 @@ declare namespace ts {
         resolveTypeReferenceDirectives?(typeReferenceDirectiveNames: string[], containingFile: string): ResolvedTypeReferenceDirective[];
         getEnvironmentVariable?(name: string): string | undefined;
         createHash?(data: string): string;
+        getModifiedTime?(fileName: string): Date;
+        setModifiedTime?(fileName: string, date: Date): void;
+        deleteFile?(fileName: string): void;
     }
     interface SourceMapRange extends TextRange {
         source?: SourceMapSource;
@@ -2876,6 +2887,10 @@ declare namespace ts {
         omitTrailingSemicolon?: boolean;
         noEmitHelpers?: boolean;
     }
+    interface GetEffectiveTypeRootsHost {
+        directoryExists?(directoryName: string): boolean;
+        getCurrentDirectory?(): string;
+    }
     /** @deprecated See comment on SymbolWriter */
     interface SymbolTracker {
         trackSymbol?(symbol: Symbol, enclosingDeclaration?: Node, meaning?: SymbolFlags): void;
@@ -3006,6 +3021,8 @@ declare namespace ts {
         getDirectories(path: string): string[];
         readDirectory(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
         getModifiedTime?(path: string): Date;
+        setModifiedTime?(path: string, time: Date): void;
+        deleteFile?(path: string): void;
         /**
          * A good implementation is node.js' `crypto.createHash`. (https://nodejs.org/api/crypto.html#crypto_crypto_createhash_algorithm)
          */
@@ -3371,6 +3388,7 @@ declare namespace ts {
     function isEnumMember(node: Node): node is EnumMember;
     function isSourceFile(node: Node): node is SourceFile;
     function isBundle(node: Node): node is Bundle;
+    function isUnparsedSource(node: Node): node is UnparsedSource;
     function isJSDocTypeExpression(node: Node): node is JSDocTypeExpression;
     function isJSDocAllType(node: JSDocAllType): node is JSDocAllType;
     function isJSDocUnknownType(node: Node): node is JSDocUnknownType;
@@ -3467,10 +3485,6 @@ declare namespace ts {
     function updateSourceFile(sourceFile: SourceFile, newText: string, textChangeRange: TextChangeRange, aggressiveChecks?: boolean): SourceFile;
 }
 declare namespace ts {
-    interface GetEffectiveTypeRootsHost {
-        directoryExists?(directoryName: string): boolean;
-        getCurrentDirectory?(): string;
-    }
     function getEffectiveTypeRoots(options: CompilerOptions, host: GetEffectiveTypeRootsHost): string[] | undefined;
     /**
      * @param {string | undefined} containingFile - file that contains type reference directive, can be undefined if containing file is unknown.
@@ -3801,7 +3815,7 @@ declare namespace ts {
     function updateSpreadAssignment(node: SpreadAssignment, expression: Expression): SpreadAssignment;
     function createEnumMember(name: string | PropertyName, initializer?: Expression): EnumMember;
     function updateEnumMember(node: EnumMember, name: PropertyName, initializer: Expression | undefined): EnumMember;
-    function updateSourceFileNode(node: SourceFile, statements: ReadonlyArray<Statement>, isDeclarationFile?: boolean, referencedFiles?: SourceFile["referencedFiles"], typeReferences?: SourceFile["typeReferenceDirectives"], hasNoDefaultLib?: boolean): SourceFile;
+    function updateSourceFileNode(node: SourceFile, statements: ReadonlyArray<Statement>, isDeclarationFile?: boolean, referencedFiles?: SourceFile["referencedFiles"], typeReferences?: SourceFile["typeReferenceDirectives"], hasNoDefaultLib?: boolean, libReferences?: SourceFile["libReferenceDirectives"]): SourceFile;
     /**
      * Creates a shallow, memberwise clone of a node for mutation.
      */
@@ -3826,8 +3840,8 @@ declare namespace ts {
     function createCommaList(elements: ReadonlyArray<Expression>): CommaListExpression;
     function updateCommaList(node: CommaListExpression, elements: ReadonlyArray<Expression>): CommaListExpression;
     function createBundle(sourceFiles: ReadonlyArray<SourceFile>, prepends?: ReadonlyArray<UnparsedSource | InputFiles>): Bundle;
-    function createUnparsedSourceFile(text: string): UnparsedSource;
-    function createInputFiles(javascript: string, declaration: string): InputFiles;
+    function createUnparsedSourceFile(text: string, map?: string): UnparsedSource;
+    function createInputFiles(javascript: string, declaration: string, javascriptMapText?: string, declarationMapText?: string): InputFiles;
     function updateBundle(node: Bundle, sourceFiles: ReadonlyArray<SourceFile>, prepends?: ReadonlyArray<UnparsedSource>): Bundle;
     function createImmediatelyInvokedFunctionExpression(statements: ReadonlyArray<Statement>): CallExpression;
     function createImmediatelyInvokedFunctionExpression(statements: ReadonlyArray<Statement>, param: ParameterDeclaration, paramValue: Expression): CallExpression;
@@ -4048,6 +4062,10 @@ declare namespace ts {
      * @returns A 'Program' object.
      */
     function createProgram(rootNames: ReadonlyArray<string>, options: CompilerOptions, host?: CompilerHost, oldProgram?: Program, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>): Program;
+    /**
+     * Returns the target config filename of a project reference
+     */
+    function resolveProjectReferencePath(host: CompilerHost, ref: ProjectReference): string | undefined;
 }
 declare namespace ts {
     interface EmitOutput {
@@ -4467,6 +4485,7 @@ declare namespace ts {
     interface PreProcessedFileInfo {
         referencedFiles: FileReference[];
         typeReferenceDirectives: FileReference[];
+        libReferenceDirectives: FileReference[];
         importedFiles: FileReference[];
         ambientExternalModules?: string[];
         isLibFile: boolean;
@@ -4651,6 +4670,7 @@ declare namespace ts {
          * There will be more than one if this is the result of merging.
          */
         spans: TextSpan[];
+        nameSpan: TextSpan | undefined;
         /** Present if non-empty */
         childItems?: NavigationTree[];
     }
@@ -7526,6 +7546,7 @@ declare namespace ts.server.protocol {
         kind: ScriptElementKind;
         kindModifiers: string;
         spans: TextSpan[];
+        nameSpan: TextSpan | undefined;
         childItems?: NavigationTree[];
     }
     type TelemetryEventName = "telemetry";
@@ -8556,9 +8577,7 @@ declare namespace ts.server {
         private mapCodeAction;
         private mapCodeFixAction;
         private mapTextChangesToCodeEdits;
-        private mapTextChangesToCodeEditsUsingScriptinfo;
         private convertTextChangeToCodeEdit;
-        private convertNewFileTextChangeToCodeEdit;
         private getBraceMatching;
         private getDiagnosticsForProject;
         getCanonicalFileName(fileName: string): string;
diff --git a/lib/tsserverlibrary.js b/lib/tsserverlibrary.js
index d03353a3474..21a25f50e7a 100644
--- a/lib/tsserverlibrary.js
+++ b/lib/tsserverlibrary.js
@@ -1,18 +1,1975 @@
-/*! *****************************************************************************
-Copyright (c) Microsoft Corporation. All rights reserved. 
-Licensed under the Apache License, Version 2.0 (the "License"); you may not use
-this file except in compliance with the License. You may obtain a copy of the
-License at http://www.apache.org/licenses/LICENSE-2.0  
- 
-THIS CODE IS PROVIDED ON AN *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
-KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
-WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE, 
-MERCHANTABLITY OR NON-INFRINGEMENT. 
- 
-See the Apache Version 2.0 License for specific language governing permissions
-and limitations under the License.
-***************************************************************************** */
-
+"use strict";"use strict";
+/*@internal*/
+var ts;
+(function (ts) {
+    /** Gets a timestamp with (at least) ms resolution */
+    ts.timestamp = typeof performance !== "undefined" && performance.now ? function () { return performance.now(); } : Date.now ? Date.now : function () { return +(new Date()); };
+})(ts || (ts = {}));
+/*@internal*/
+/** Performance measurements for the compiler. */
+(function (ts) {
+    var performance;
+    (function (performance) {
+        // NOTE: cannot use ts.noop as core.ts loads after this
+        var profilerEvent = typeof onProfilerEvent === "function" && onProfilerEvent.profiler === true ? onProfilerEvent : function () { };
+        var enabled = false;
+        var profilerStart = 0;
+        var counts;
+        var marks;
+        var measures;
+        /**
+         * Marks a performance event.
+         *
+         * @param markName The name of the mark.
+         */
+        function mark(markName) {
+            if (enabled) {
+                marks.set(markName, ts.timestamp());
+                counts.set(markName, (counts.get(markName) || 0) + 1);
+                profilerEvent(markName);
+            }
+        }
+        performance.mark = mark;
+        /**
+         * Adds a performance measurement with the specified name.
+         *
+         * @param measureName The name of the performance measurement.
+         * @param startMarkName The name of the starting mark. If not supplied, the point at which the
+         *      profiler was enabled is used.
+         * @param endMarkName The name of the ending mark. If not supplied, the current timestamp is
+         *      used.
+         */
+        function measure(measureName, startMarkName, endMarkName) {
+            if (enabled) {
+                var end = endMarkName && marks.get(endMarkName) || ts.timestamp();
+                var start = startMarkName && marks.get(startMarkName) || profilerStart;
+                measures.set(measureName, (measures.get(measureName) || 0) + (end - start));
+            }
+        }
+        performance.measure = measure;
+        /**
+         * Gets the number of times a marker was encountered.
+         *
+         * @param markName The name of the mark.
+         */
+        function getCount(markName) {
+            return counts && counts.get(markName) || 0;
+        }
+        performance.getCount = getCount;
+        /**
+         * Gets the total duration of all measurements with the supplied name.
+         *
+         * @param measureName The name of the measure whose durations should be accumulated.
+         */
+        function getDuration(measureName) {
+            return measures && measures.get(measureName) || 0;
+        }
+        performance.getDuration = getDuration;
+        /**
+         * Iterate over each measure, performing some action
+         *
+         * @param cb The action to perform for each measure
+         */
+        function forEachMeasure(cb) {
+            measures.forEach(function (measure, key) {
+                cb(key, measure);
+            });
+        }
+        performance.forEachMeasure = forEachMeasure;
+        /** Enables (and resets) performance measurements for the compiler. */
+        function enable() {
+            counts = ts.createMap();
+            marks = ts.createMap();
+            measures = ts.createMap();
+            enabled = true;
+            profilerStart = ts.timestamp();
+        }
+        performance.enable = enable;
+        /** Disables performance measurements for the compiler. */
+        function disable() {
+            enabled = false;
+        }
+        performance.disable = disable;
+    })(performance = ts.performance || (ts.performance = {}));
+})(ts || (ts = {}));
+var ts;
+(function (ts) {
+    // WARNING: The script `configureNightly.ts` uses a regexp to parse out these values.
+    // If changing the text in this section, be sure to test `configureNightly` too.
+    ts.versionMajorMinor = "3.0";
+    /** The version of the TypeScript compiler release */
+    ts.version = ts.versionMajorMinor + ".0-dev";
+})(ts || (ts = {}));
+/* @internal */
+(function (ts) {
+    var Comparison;
+    (function (Comparison) {
+        Comparison[Comparison["LessThan"] = -1] = "LessThan";
+        Comparison[Comparison["EqualTo"] = 0] = "EqualTo";
+        Comparison[Comparison["GreaterThan"] = 1] = "GreaterThan";
+    })(Comparison = ts.Comparison || (ts.Comparison = {}));
+    /** Create a MapLike with good performance. */
+    function createDictionaryObject() {
+        var map = Object.create(/*prototype*/ null); // tslint:disable-line:no-null-keyword
+        // Using 'delete' on an object causes V8 to put the object in dictionary mode.
+        // This disables creation of hidden classes, which are expensive when an object is
+        // constantly changing shape.
+        map.__ = undefined;
+        delete map.__;
+        return map;
+    }
+    /** Create a new map. If a template object is provided, the map will copy entries from it. */
+    function createMap() {
+        return new ts.MapCtr();
+    }
+    ts.createMap = createMap;
+    function createMapFromEntries(entries) {
+        var map = createMap();
+        for (var _i = 0, entries_1 = entries; _i < entries_1.length; _i++) {
+            var _a = entries_1[_i], key = _a[0], value = _a[1];
+            map.set(key, value);
+        }
+        return map;
+    }
+    ts.createMapFromEntries = createMapFromEntries;
+    function createMapFromTemplate(template) {
+        var map = new ts.MapCtr();
+        // Copies keys/values from template. Note that for..in will not throw if
+        // template is undefined, and instead will just exit the loop.
+        for (var key in template) {
+            if (hasOwnProperty.call(template, key)) {
+                map.set(key, template[key]);
+            }
+        }
+        return map;
+    }
+    ts.createMapFromTemplate = createMapFromTemplate;
+    // Internet Explorer's Map doesn't support iteration, so don't use it.
+    // tslint:disable-next-line no-in-operator variable-name
+    ts.MapCtr = typeof Map !== "undefined" && "entries" in Map.prototype ? Map : shimMap();
+    // Keep the class inside a function so it doesn't get compiled if it's not used.
+    function shimMap() {
+        var MapIterator = /** @class */ (function () {
+            function MapIterator(data, selector) {
+                this.index = 0;
+                this.data = data;
+                this.selector = selector;
+                this.keys = Object.keys(data);
+            }
+            MapIterator.prototype.next = function () {
+                var index = this.index;
+                if (index < this.keys.length) {
+                    this.index++;
+                    return { value: this.selector(this.data, this.keys[index]), done: false };
+                }
+                return { value: undefined, done: true };
+            };
+            return MapIterator;
+        }());
+        return /** @class */ (function () {
+            function class_1() {
+                this.data = createDictionaryObject();
+                this.size = 0;
+            }
+            class_1.prototype.get = function (key) {
+                return this.data[key];
+            };
+            class_1.prototype.set = function (key, value) {
+                if (!this.has(key)) {
+                    this.size++;
+                }
+                this.data[key] = value;
+                return this;
+            };
+            class_1.prototype.has = function (key) {
+                // tslint:disable-next-line:no-in-operator
+                return key in this.data;
+            };
+            class_1.prototype.delete = function (key) {
+                if (this.has(key)) {
+                    this.size--;
+                    delete this.data[key];
+                    return true;
+                }
+                return false;
+            };
+            class_1.prototype.clear = function () {
+                this.data = createDictionaryObject();
+                this.size = 0;
+            };
+            class_1.prototype.keys = function () {
+                return new MapIterator(this.data, function (_data, key) { return key; });
+            };
+            class_1.prototype.values = function () {
+                return new MapIterator(this.data, function (data, key) { return data[key]; });
+            };
+            class_1.prototype.entries = function () {
+                return new MapIterator(this.data, function (data, key) { return [key, data[key]]; });
+            };
+            class_1.prototype.forEach = function (action) {
+                for (var key in this.data) {
+                    action(this.data[key], key);
+                }
+            };
+            return class_1;
+        }());
+    }
+    function length(array) {
+        return array ? array.length : 0;
+    }
+    ts.length = length;
+    /**
+     * Iterates through 'array' by index and performs the callback on each element of array until the callback
+     * returns a truthy value, then returns that value.
+     * If no such value is found, the callback is applied to each element of array and undefined is returned.
+     */
+    function forEach(array, callback) {
+        if (array) {
+            for (var i = 0; i < array.length; i++) {
+                var result = callback(array[i], i);
+                if (result) {
+                    return result;
+                }
+            }
+        }
+        return undefined;
+    }
+    ts.forEach = forEach;
+    /** Like `forEach`, but suitable for use with numbers and strings (which may be falsy). */
+    function firstDefined(array, callback) {
+        if (array === undefined) {
+            return undefined;
+        }
+        for (var i = 0; i < array.length; i++) {
+            var result = callback(array[i], i);
+            if (result !== undefined) {
+                return result;
+            }
+        }
+        return undefined;
+    }
+    ts.firstDefined = firstDefined;
+    function firstDefinedIterator(iter, callback) {
+        while (true) {
+            var _a = iter.next(), value = _a.value, done = _a.done;
+            if (done) {
+                return undefined;
+            }
+            var result = callback(value);
+            if (result !== undefined) {
+                return result;
+            }
+        }
+    }
+    ts.firstDefinedIterator = firstDefinedIterator;
+    function zipWith(arrayA, arrayB, callback) {
+        var result = [];
+        Debug.assertEqual(arrayA.length, arrayB.length);
+        for (var i = 0; i < arrayA.length; i++) {
+            result.push(callback(arrayA[i], arrayB[i], i));
+        }
+        return result;
+    }
+    ts.zipWith = zipWith;
+    function zipToIterator(arrayA, arrayB) {
+        Debug.assertEqual(arrayA.length, arrayB.length);
+        var i = 0;
+        return {
+            next: function () {
+                if (i === arrayA.length) {
+                    return { value: undefined, done: true };
+                }
+                i++;
+                return { value: [arrayA[i - 1], arrayB[i - 1]], done: false };
+            }
+        };
+    }
+    ts.zipToIterator = zipToIterator;
+    function zipToMap(keys, values) {
+        Debug.assert(keys.length === values.length);
+        var map = createMap();
+        for (var i = 0; i < keys.length; ++i) {
+            map.set(keys[i], values[i]);
+        }
+        return map;
+    }
+    ts.zipToMap = zipToMap;
+    /**
+     * Iterates through `array` by index and performs the callback on each element of array until the callback
+     * returns a falsey value, then returns false.
+     * If no such value is found, the callback is applied to each element of array and `true` is returned.
+     */
+    function every(array, callback) {
+        if (array) {
+            for (var i = 0; i < array.length; i++) {
+                if (!callback(array[i], i)) {
+                    return false;
+                }
+            }
+        }
+        return true;
+    }
+    ts.every = every;
+    function find(array, predicate) {
+        for (var i = 0; i < array.length; i++) {
+            var value = array[i];
+            if (predicate(value, i)) {
+                return value;
+            }
+        }
+        return undefined;
+    }
+    ts.find = find;
+    function findLast(array, predicate) {
+        for (var i = array.length - 1; i >= 0; i--) {
+            var value = array[i];
+            if (predicate(value, i)) {
+                return value;
+            }
+        }
+        return undefined;
+    }
+    ts.findLast = findLast;
+    /** Works like Array.prototype.findIndex, returning `-1` if no element satisfying the predicate is found. */
+    function findIndex(array, predicate, startIndex) {
+        for (var i = startIndex || 0; i < array.length; i++) {
+            if (predicate(array[i], i)) {
+                return i;
+            }
+        }
+        return -1;
+    }
+    ts.findIndex = findIndex;
+    function findLastIndex(array, predicate, startIndex) {
+        for (var i = startIndex === undefined ? array.length - 1 : startIndex; i >= 0; i--) {
+            if (predicate(array[i], i)) {
+                return i;
+            }
+        }
+        return -1;
+    }
+    ts.findLastIndex = findLastIndex;
+    /**
+     * Returns the first truthy result of `callback`, or else fails.
+     * This is like `forEach`, but never returns undefined.
+     */
+    function findMap(array, callback) {
+        for (var i = 0; i < array.length; i++) {
+            var result = callback(array[i], i);
+            if (result) {
+                return result;
+            }
+        }
+        return Debug.fail();
+    }
+    ts.findMap = findMap;
+    function contains(array, value, equalityComparer) {
+        if (equalityComparer === void 0) { equalityComparer = equateValues; }
+        if (array) {
+            for (var _i = 0, array_1 = array; _i < array_1.length; _i++) {
+                var v = array_1[_i];
+                if (equalityComparer(v, value)) {
+                    return true;
+                }
+            }
+        }
+        return false;
+    }
+    ts.contains = contains;
+    function arraysEqual(a, b, equalityComparer) {
+        if (equalityComparer === void 0) { equalityComparer = equateValues; }
+        return a.length === b.length && a.every(function (x, i) { return equalityComparer(x, b[i]); });
+    }
+    ts.arraysEqual = arraysEqual;
+    function indexOfAnyCharCode(text, charCodes, start) {
+        for (var i = start || 0; i < text.length; i++) {
+            if (contains(charCodes, text.charCodeAt(i))) {
+                return i;
+            }
+        }
+        return -1;
+    }
+    ts.indexOfAnyCharCode = indexOfAnyCharCode;
+    function countWhere(array, predicate) {
+        var count = 0;
+        if (array) {
+            for (var i = 0; i < array.length; i++) {
+                var v = array[i];
+                if (predicate(v, i)) {
+                    count++;
+                }
+            }
+        }
+        return count;
+    }
+    ts.countWhere = countWhere;
+    function filter(array, f) {
+        if (array) {
+            var len = array.length;
+            var i = 0;
+            while (i < len && f(array[i]))
+                i++;
+            if (i < len) {
+                var result = array.slice(0, i);
+                i++;
+                while (i < len) {
+                    var item = array[i];
+                    if (f(item)) {
+                        result.push(item);
+                    }
+                    i++;
+                }
+                return result;
+            }
+        }
+        return array;
+    }
+    ts.filter = filter;
+    function filterMutate(array, f) {
+        var outIndex = 0;
+        for (var i = 0; i < array.length; i++) {
+            if (f(array[i], i, array)) {
+                array[outIndex] = array[i];
+                outIndex++;
+            }
+        }
+        array.length = outIndex;
+    }
+    ts.filterMutate = filterMutate;
+    function clear(array) {
+        array.length = 0;
+    }
+    ts.clear = clear;
+    function map(array, f) {
+        var result;
+        if (array) {
+            result = [];
+            for (var i = 0; i < array.length; i++) {
+                result.push(f(array[i], i));
+            }
+        }
+        return result;
+    }
+    ts.map = map;
+    function mapIterator(iter, mapFn) {
+        return {
+            next: function () {
+                var iterRes = iter.next();
+                return iterRes.done ? iterRes : { value: mapFn(iterRes.value), done: false };
+            }
+        };
+    }
+    ts.mapIterator = mapIterator;
+    function sameMap(array, f) {
+        if (array) {
+            for (var i = 0; i < array.length; i++) {
+                var item = array[i];
+                var mapped = f(item, i);
+                if (item !== mapped) {
+                    var result = array.slice(0, i);
+                    result.push(mapped);
+                    for (i++; i < array.length; i++) {
+                        result.push(f(array[i], i));
+                    }
+                    return result;
+                }
+            }
+        }
+        return array;
+    }
+    ts.sameMap = sameMap;
+    function flatten(array) {
+        var result;
+        if (array) {
+            result = [];
+            for (var _i = 0, array_2 = array; _i < array_2.length; _i++) {
+                var v = array_2[_i];
+                if (v) {
+                    if (isArray(v)) {
+                        addRange(result, v);
+                    }
+                    else {
+                        result.push(v);
+                    }
+                }
+            }
+        }
+        return result;
+    }
+    ts.flatten = flatten;
+    function flatMap(array, mapfn) {
+        var result;
+        if (array) {
+            result = [];
+            for (var i = 0; i < array.length; i++) {
+                var v = mapfn(array[i], i);
+                if (v) {
+                    if (isArray(v)) {
+                        addRange(result, v);
+                    }
+                    else {
+                        result.push(v);
+                    }
+                }
+            }
+        }
+        return result;
+    }
+    ts.flatMap = flatMap;
+    function flatMapIterator(iter, mapfn) {
+        var first = iter.next();
+        if (first.done) {
+            return ts.emptyIterator;
+        }
+        var currentIter = getIterator(first.value);
+        return {
+            next: function () {
+                while (true) {
+                    var currentRes = currentIter.next();
+                    if (!currentRes.done) {
+                        return currentRes;
+                    }
+                    var iterRes = iter.next();
+                    if (iterRes.done) {
+                        return iterRes;
+                    }
+                    currentIter = getIterator(iterRes.value);
+                }
+            },
+        };
+        function getIterator(x) {
+            var res = mapfn(x);
+            return res === undefined ? ts.emptyIterator : isArray(res) ? arrayIterator(res) : res;
+        }
+    }
+    ts.flatMapIterator = flatMapIterator;
+    function sameFlatMap(array, mapfn) {
+        var result;
+        if (array) {
+            for (var i = 0; i < array.length; i++) {
+                var item = array[i];
+                var mapped = mapfn(item, i);
+                if (result || item !== mapped || isArray(mapped)) {
+                    if (!result) {
+                        result = array.slice(0, i);
+                    }
+                    if (isArray(mapped)) {
+                        addRange(result, mapped);
+                    }
+                    else {
+                        result.push(mapped);
+                    }
+                }
+            }
+        }
+        return result || array;
+    }
+    ts.sameFlatMap = sameFlatMap;
+    function mapAllOrFail(array, mapFn) {
+        var result = [];
+        for (var i = 0; i < array.length; i++) {
+            var mapped = mapFn(array[i], i);
+            if (mapped === undefined) {
+                return undefined;
+            }
+            result.push(mapped);
+        }
+        return result;
+    }
+    ts.mapAllOrFail = mapAllOrFail;
+    function mapDefined(array, mapFn) {
+        var result = [];
+        if (array) {
+            for (var i = 0; i < array.length; i++) {
+                var mapped = mapFn(array[i], i);
+                if (mapped !== undefined) {
+                    result.push(mapped);
+                }
+            }
+        }
+        return result;
+    }
+    ts.mapDefined = mapDefined;
+    function mapDefinedIterator(iter, mapFn) {
+        return {
+            next: function () {
+                while (true) {
+                    var res = iter.next();
+                    if (res.done) {
+                        return res;
+                    }
+                    var value = mapFn(res.value);
+                    if (value !== undefined) {
+                        return { value: value, done: false };
+                    }
+                }
+            }
+        };
+    }
+    ts.mapDefinedIterator = mapDefinedIterator;
+    ts.emptyIterator = { next: function () { return ({ value: undefined, done: true }); } };
+    function singleIterator(value) {
+        var done = false;
+        return {
+            next: function () {
+                var wasDone = done;
+                done = true;
+                return wasDone ? { value: undefined, done: true } : { value: value, done: false };
+            }
+        };
+    }
+    ts.singleIterator = singleIterator;
+    function spanMap(array, keyfn, mapfn) {
+        var result;
+        if (array) {
+            result = [];
+            var len = array.length;
+            var previousKey = void 0;
+            var key = void 0;
+            var start = 0;
+            var pos = 0;
+            while (start < len) {
+                while (pos < len) {
+                    var value = array[pos];
+                    key = keyfn(value, pos);
+                    if (pos === 0) {
+                        previousKey = key;
+                    }
+                    else if (key !== previousKey) {
+                        break;
+                    }
+                    pos++;
+                }
+                if (start < pos) {
+                    var v = mapfn(array.slice(start, pos), previousKey, start, pos);
+                    if (v) {
+                        result.push(v);
+                    }
+                    start = pos;
+                }
+                previousKey = key;
+                pos++;
+            }
+        }
+        return result;
+    }
+    ts.spanMap = spanMap;
+    function mapEntries(map, f) {
+        if (!map) {
+            return undefined;
+        }
+        var result = createMap();
+        map.forEach(function (value, key) {
+            var _a = f(key, value), newKey = _a[0], newValue = _a[1];
+            result.set(newKey, newValue);
+        });
+        return result;
+    }
+    ts.mapEntries = mapEntries;
+    function some(array, predicate) {
+        if (array) {
+            if (predicate) {
+                for (var _i = 0, array_3 = array; _i < array_3.length; _i++) {
+                    var v = array_3[_i];
+                    if (predicate(v)) {
+                        return true;
+                    }
+                }
+            }
+            else {
+                return array.length > 0;
+            }
+        }
+        return false;
+    }
+    ts.some = some;
+    /** Calls the callback with (start, afterEnd) index pairs for each range where 'pred' is true. */
+    function getRangesWhere(arr, pred, cb) {
+        var start;
+        for (var i = 0; i < arr.length; i++) {
+            if (pred(arr[i])) {
+                start = start === undefined ? i : start;
+            }
+            else {
+                if (start !== undefined) {
+                    cb(start, i);
+                    start = undefined;
+                }
+            }
+        }
+        if (start !== undefined)
+            cb(start, arr.length);
+    }
+    ts.getRangesWhere = getRangesWhere;
+    function concatenate(array1, array2) {
+        if (!some(array2))
+            return array1;
+        if (!some(array1))
+            return array2;
+        return array1.concat(array2);
+    }
+    ts.concatenate = concatenate;
+    function deduplicateRelational(array, equalityComparer, comparer) {
+        // Perform a stable sort of the array. This ensures the first entry in a list of
+        // duplicates remains the first entry in the result.
+        var indices = array.map(function (_, i) { return i; });
+        stableSortIndices(array, indices, comparer);
+        var last = array[indices[0]];
+        var deduplicated = [indices[0]];
+        for (var i = 1; i < indices.length; i++) {
+            var index = indices[i];
+            var item = array[index];
+            if (!equalityComparer(last, item)) {
+                deduplicated.push(index);
+                last = item;
+            }
+        }
+        // restore original order
+        deduplicated.sort();
+        return deduplicated.map(function (i) { return array[i]; });
+    }
+    function deduplicateEquality(array, equalityComparer) {
+        var result = [];
+        for (var _i = 0, array_4 = array; _i < array_4.length; _i++) {
+            var item = array_4[_i];
+            pushIfUnique(result, item, equalityComparer);
+        }
+        return result;
+    }
+    function deduplicate(array, equalityComparer, comparer) {
+        return !array ? undefined :
+            array.length === 0 ? [] :
+                array.length === 1 ? array.slice() :
+                    comparer ? deduplicateRelational(array, equalityComparer, comparer) :
+                        deduplicateEquality(array, equalityComparer);
+    }
+    ts.deduplicate = deduplicate;
+    function deduplicateSorted(array, comparer) {
+        if (!array)
+            return undefined;
+        if (array.length === 0)
+            return [];
+        var last = array[0];
+        var deduplicated = [last];
+        for (var i = 1; i < array.length; i++) {
+            var next = array[i];
+            switch (comparer(next, last)) {
+                // equality comparison
+                case true:
+                // relational comparison
+                case 0 /* EqualTo */:
+                    continue;
+                case -1 /* LessThan */:
+                    // If `array` is sorted, `next` should **never** be less than `last`.
+                    return Debug.fail("Array is unsorted.");
+            }
+            deduplicated.push(last = next);
+        }
+        return deduplicated;
+    }
+    function insertSorted(array, insert, compare) {
+        if (array.length === 0) {
+            array.push(insert);
+            return;
+        }
+        var insertIndex = binarySearch(array, insert, identity, compare);
+        if (insertIndex < 0) {
+            array.splice(~insertIndex, 0, insert);
+        }
+    }
+    ts.insertSorted = insertSorted;
+    function sortAndDeduplicate(array, comparer, equalityComparer) {
+        return deduplicateSorted(sort(array, comparer), equalityComparer || comparer);
+    }
+    ts.sortAndDeduplicate = sortAndDeduplicate;
+    function arrayIsEqualTo(array1, array2, equalityComparer) {
+        if (equalityComparer === void 0) { equalityComparer = equateValues; }
+        if (!array1 || !array2) {
+            return array1 === array2;
+        }
+        if (array1.length !== array2.length) {
+            return false;
+        }
+        for (var i = 0; i < array1.length; i++) {
+            if (!equalityComparer(array1[i], array2[i])) {
+                return false;
+            }
+        }
+        return true;
+    }
+    ts.arrayIsEqualTo = arrayIsEqualTo;
+    function compact(array) {
+        var result;
+        if (array) {
+            for (var i = 0; i < array.length; i++) {
+                var v = array[i];
+                if (result || !v) {
+                    if (!result) {
+                        result = array.slice(0, i);
+                    }
+                    if (v) {
+                        result.push(v);
+                    }
+                }
+            }
+        }
+        return result || array;
+    }
+    ts.compact = compact;
+    /**
+     * Gets the relative complement of `arrayA` with respect to `arrayB`, returning the elements that
+     * are not present in `arrayA` but are present in `arrayB`. Assumes both arrays are sorted
+     * based on the provided comparer.
+     */
+    function relativeComplement(arrayA, arrayB, comparer) {
+        if (!arrayB || !arrayA || arrayB.length === 0 || arrayA.length === 0)
+            return arrayB;
+        var result = [];
+        loopB: for (var offsetA = 0, offsetB = 0; offsetB < arrayB.length; offsetB++) {
+            if (offsetB > 0) {
+                // Ensure `arrayB` is properly sorted.
+                Debug.assertGreaterThanOrEqual(comparer(arrayB[offsetB], arrayB[offsetB - 1]), 0 /* EqualTo */);
+            }
+            loopA: for (var startA = offsetA; offsetA < arrayA.length; offsetA++) {
+                if (offsetA > startA) {
+                    // Ensure `arrayA` is properly sorted. We only need to perform this check if
+                    // `offsetA` has changed since we entered the loop.
+                    Debug.assertGreaterThanOrEqual(comparer(arrayA[offsetA], arrayA[offsetA - 1]), 0 /* EqualTo */);
+                }
+                switch (comparer(arrayB[offsetB], arrayA[offsetA])) {
+                    case -1 /* LessThan */:
+                        // If B is less than A, B does not exist in arrayA. Add B to the result and
+                        // move to the next element in arrayB without changing the current position
+                        // in arrayA.
+                        result.push(arrayB[offsetB]);
+                        continue loopB;
+                    case 0 /* EqualTo */:
+                        // If B is equal to A, B exists in arrayA. Move to the next element in
+                        // arrayB without adding B to the result or changing the current position
+                        // in arrayA.
+                        continue loopB;
+                    case 1 /* GreaterThan */:
+                        // If B is greater than A, we need to keep looking for B in arrayA. Move to
+                        // the next element in arrayA and recheck.
+                        continue loopA;
+                }
+            }
+        }
+        return result;
+    }
+    ts.relativeComplement = relativeComplement;
+    function sum(array, prop) {
+        var result = 0;
+        for (var _i = 0, array_5 = array; _i < array_5.length; _i++) {
+            var v = array_5[_i];
+            result += v[prop];
+        }
+        return result;
+    }
+    ts.sum = sum;
+    function append(to, value) {
+        if (value === undefined)
+            return to;
+        if (to === undefined)
+            return [value];
+        to.push(value);
+        return to;
+    }
+    ts.append = append;
+    /**
+     * Gets the actual offset into an array for a relative offset. Negative offsets indicate a
+     * position offset from the end of the array.
+     */
+    function toOffset(array, offset) {
+        return offset < 0 ? array.length + offset : offset;
+    }
+    function addRange(to, from, start, end) {
+        if (from === undefined || from.length === 0)
+            return to;
+        if (to === undefined)
+            return from.slice(start, end);
+        start = start === undefined ? 0 : toOffset(from, start);
+        end = end === undefined ? from.length : toOffset(from, end);
+        for (var i = start; i < end && i < from.length; i++) {
+            if (from[i] !== undefined) {
+                to.push(from[i]);
+            }
+        }
+        return to;
+    }
+    ts.addRange = addRange;
+    /**
+     * @return Whether the value was added.
+     */
+    function pushIfUnique(array, toAdd, equalityComparer) {
+        if (contains(array, toAdd, equalityComparer)) {
+            return false;
+        }
+        else {
+            array.push(toAdd);
+            return true;
+        }
+    }
+    ts.pushIfUnique = pushIfUnique;
+    /**
+     * Unlike `pushIfUnique`, this can take `undefined` as an input, and returns a new array.
+     */
+    function appendIfUnique(array, toAdd, equalityComparer) {
+        if (array) {
+            pushIfUnique(array, toAdd, equalityComparer);
+            return array;
+        }
+        else {
+            return [toAdd];
+        }
+    }
+    ts.appendIfUnique = appendIfUnique;
+    function stableSortIndices(array, indices, comparer) {
+        // sort indices by value then position
+        indices.sort(function (x, y) { return comparer(array[x], array[y]) || compareValues(x, y); });
+    }
+    /**
+     * Returns a new sorted array.
+     */
+    function sort(array, comparer) {
+        return array.slice().sort(comparer);
+    }
+    ts.sort = sort;
+    function best(iter, isBetter) {
+        var x = iter.next();
+        if (x.done) {
+            return undefined;
+        }
+        var best = x.value;
+        while (true) {
+            var _a = iter.next(), value = _a.value, done = _a.done;
+            if (done) {
+                return best;
+            }
+            if (isBetter(value, best)) {
+                best = value;
+            }
+        }
+    }
+    ts.best = best;
+    function arrayIterator(array) {
+        var i = 0;
+        return { next: function () {
+                if (i === array.length) {
+                    return { value: undefined, done: true };
+                }
+                else {
+                    i++;
+                    return { value: array[i - 1], done: false };
+                }
+            } };
+    }
+    ts.arrayIterator = arrayIterator;
+    /**
+     * Stable sort of an array. Elements equal to each other maintain their relative position in the array.
+     */
+    function stableSort(array, comparer) {
+        var indices = array.map(function (_, i) { return i; });
+        stableSortIndices(array, indices, comparer);
+        return indices.map(function (i) { return array[i]; });
+    }
+    ts.stableSort = stableSort;
+    function rangeEquals(array1, array2, pos, end) {
+        while (pos < end) {
+            if (array1[pos] !== array2[pos]) {
+                return false;
+            }
+            pos++;
+        }
+        return true;
+    }
+    ts.rangeEquals = rangeEquals;
+    /**
+     * Returns the element at a specific offset in an array if non-empty, `undefined` otherwise.
+     * A negative offset indicates the element should be retrieved from the end of the array.
+     */
+    function elementAt(array, offset) {
+        if (array) {
+            offset = toOffset(array, offset);
+            if (offset < array.length) {
+                return array[offset];
+            }
+        }
+        return undefined;
+    }
+    ts.elementAt = elementAt;
+    /**
+     * Returns the first element of an array if non-empty, `undefined` otherwise.
+     */
+    function firstOrUndefined(array) {
+        return array.length === 0 ? undefined : array[0];
+    }
+    ts.firstOrUndefined = firstOrUndefined;
+    function first(array) {
+        Debug.assert(array.length !== 0);
+        return array[0];
+    }
+    ts.first = first;
+    /**
+     * Returns the last element of an array if non-empty, `undefined` otherwise.
+     */
+    function lastOrUndefined(array) {
+        return array.length === 0 ? undefined : array[array.length - 1];
+    }
+    ts.lastOrUndefined = lastOrUndefined;
+    function last(array) {
+        Debug.assert(array.length !== 0);
+        return array[array.length - 1];
+    }
+    ts.last = last;
+    /**
+     * Returns the only element of an array if it contains only one element, `undefined` otherwise.
+     */
+    function singleOrUndefined(array) {
+        return array && array.length === 1
+            ? array[0]
+            : undefined;
+    }
+    ts.singleOrUndefined = singleOrUndefined;
+    function singleOrMany(array) {
+        return array && array.length === 1
+            ? array[0]
+            : array;
+    }
+    ts.singleOrMany = singleOrMany;
+    function replaceElement(array, index, value) {
+        var result = array.slice(0);
+        result[index] = value;
+        return result;
+    }
+    ts.replaceElement = replaceElement;
+    /**
+     * Performs a binary search, finding the index at which `value` occurs in `array`.
+     * If no such index is found, returns the 2's-complement of first index at which
+     * `array[index]` exceeds `value`.
+     * @param array A sorted array whose first element must be no larger than number
+     * @param value The value to be searched for in the array.
+     * @param keySelector A callback used to select the search key from `value` and each element of
+     * `array`.
+     * @param keyComparer A callback used to compare two keys in a sorted array.
+     * @param offset An offset into `array` at which to start the search.
+     */
+    function binarySearch(array, value, keySelector, keyComparer, offset) {
+        if (!array || array.length === 0) {
+            return -1;
+        }
+        var low = offset || 0;
+        var high = array.length - 1;
+        var key = keySelector(value);
+        while (low <= high) {
+            var middle = low + ((high - low) >> 1);
+            var midKey = keySelector(array[middle]);
+            switch (keyComparer(midKey, key)) {
+                case -1 /* LessThan */:
+                    low = middle + 1;
+                    break;
+                case 0 /* EqualTo */:
+                    return middle;
+                case 1 /* GreaterThan */:
+                    high = middle - 1;
+                    break;
+            }
+        }
+        return ~low;
+    }
+    ts.binarySearch = binarySearch;
+    function reduceLeft(array, f, initial, start, count) {
+        if (array && array.length > 0) {
+            var size = array.length;
+            if (size > 0) {
+                var pos = start === undefined || start < 0 ? 0 : start;
+                var end = count === undefined || pos + count > size - 1 ? size - 1 : pos + count;
+                var result = void 0;
+                if (arguments.length <= 2) {
+                    result = array[pos];
+                    pos++;
+                }
+                else {
+                    result = initial;
+                }
+                while (pos <= end) {
+                    result = f(result, array[pos], pos);
+                    pos++;
+                }
+                return result;
+            }
+        }
+        return initial;
+    }
+    ts.reduceLeft = reduceLeft;
+    var hasOwnProperty = Object.prototype.hasOwnProperty;
+    /**
+     * Indicates whether a map-like contains an own property with the specified key.
+     *
+     * @param map A map-like.
+     * @param key A property key.
+     */
+    function hasProperty(map, key) {
+        return hasOwnProperty.call(map, key);
+    }
+    ts.hasProperty = hasProperty;
+    /**
+     * Gets the value of an owned property in a map-like.
+     *
+     * @param map A map-like.
+     * @param key A property key.
+     */
+    function getProperty(map, key) {
+        return hasOwnProperty.call(map, key) ? map[key] : undefined;
+    }
+    ts.getProperty = getProperty;
+    /**
+     * Gets the owned, enumerable property keys of a map-like.
+     */
+    function getOwnKeys(map) {
+        var keys = [];
+        for (var key in map) {
+            if (hasOwnProperty.call(map, key)) {
+                keys.push(key);
+            }
+        }
+        return keys;
+    }
+    ts.getOwnKeys = getOwnKeys;
+    function getOwnValues(sparseArray) {
+        var values = [];
+        for (var key in sparseArray) {
+            if (hasOwnProperty.call(sparseArray, key)) {
+                values.push(sparseArray[key]);
+            }
+        }
+        return values;
+    }
+    ts.getOwnValues = getOwnValues;
+    function arrayFrom(iterator, map) {
+        var _a;
+        var result = [];
+        for (var _b = iterator.next(), value = _b.value, done = _b.done; !done; _a = iterator.next(), value = _a.value, done = _a.done, _a) {
+            result.push(map ? map(value) : value);
+        }
+        return result;
+    }
+    ts.arrayFrom = arrayFrom;
+    function assign(t) {
+        var args = [];
+        for (var _i = 1; _i < arguments.length; _i++) {
+            args[_i - 1] = arguments[_i];
+        }
+        for (var _a = 0, args_1 = args; _a < args_1.length; _a++) {
+            var arg = args_1[_a];
+            for (var p in arg) {
+                if (hasProperty(arg, p)) {
+                    t[p] = arg[p]; // TODO: GH#23368
+                }
+            }
+        }
+        return t;
+    }
+    ts.assign = assign;
+    /**
+     * Performs a shallow equality comparison of the contents of two map-likes.
+     *
+     * @param left A map-like whose properties should be compared.
+     * @param right A map-like whose properties should be compared.
+     */
+    function equalOwnProperties(left, right, equalityComparer) {
+        if (equalityComparer === void 0) { equalityComparer = equateValues; }
+        if (left === right)
+            return true;
+        if (!left || !right)
+            return false;
+        for (var key in left) {
+            if (hasOwnProperty.call(left, key)) {
+                if (!hasOwnProperty.call(right, key) === undefined)
+                    return false;
+                if (!equalityComparer(left[key], right[key]))
+                    return false;
+            }
+        }
+        for (var key in right) {
+            if (hasOwnProperty.call(right, key)) {
+                if (!hasOwnProperty.call(left, key))
+                    return false;
+            }
+        }
+        return true;
+    }
+    ts.equalOwnProperties = equalOwnProperties;
+    function arrayToMap(array, makeKey, makeValue) {
+        if (makeValue === void 0) { makeValue = identity; }
+        var result = createMap();
+        for (var _i = 0, array_6 = array; _i < array_6.length; _i++) {
+            var value = array_6[_i];
+            var key = makeKey(value);
+            if (key !== undefined)
+                result.set(key, makeValue(value));
+        }
+        return result;
+    }
+    ts.arrayToMap = arrayToMap;
+    function arrayToNumericMap(array, makeKey, makeValue) {
+        if (makeValue === void 0) { makeValue = identity; }
+        var result = [];
+        for (var _i = 0, array_7 = array; _i < array_7.length; _i++) {
+            var value = array_7[_i];
+            result[makeKey(value)] = makeValue(value);
+        }
+        return result;
+    }
+    ts.arrayToNumericMap = arrayToNumericMap;
+    function arrayToMultiMap(values, makeKey, makeValue) {
+        if (makeValue === void 0) { makeValue = identity; }
+        var result = createMultiMap();
+        for (var _i = 0, values_1 = values; _i < values_1.length; _i++) {
+            var value = values_1[_i];
+            result.add(makeKey(value), makeValue(value));
+        }
+        return result;
+    }
+    ts.arrayToMultiMap = arrayToMultiMap;
+    function group(values, getGroupId) {
+        return arrayFrom(arrayToMultiMap(values, getGroupId).values());
+    }
+    ts.group = group;
+    function clone(object) {
+        var result = {};
+        for (var id in object) {
+            if (hasOwnProperty.call(object, id)) {
+                result[id] = object[id];
+            }
+        }
+        return result;
+    }
+    ts.clone = clone;
+    function extend(first, second) {
+        var result = {};
+        for (var id in second) {
+            if (hasOwnProperty.call(second, id)) {
+                result[id] = second[id];
+            }
+        }
+        for (var id in first) {
+            if (hasOwnProperty.call(first, id)) {
+                result[id] = first[id];
+            }
+        }
+        return result;
+    }
+    ts.extend = extend;
+    function createMultiMap() {
+        var map = createMap();
+        map.add = multiMapAdd;
+        map.remove = multiMapRemove;
+        return map;
+    }
+    ts.createMultiMap = createMultiMap;
+    function multiMapAdd(key, value) {
+        var values = this.get(key);
+        if (values) {
+            values.push(value);
+        }
+        else {
+            this.set(key, values = [value]);
+        }
+        return values;
+    }
+    function multiMapRemove(key, value) {
+        var values = this.get(key);
+        if (values) {
+            unorderedRemoveItem(values, value);
+            if (!values.length) {
+                this.delete(key);
+            }
+        }
+    }
+    /**
+     * Tests whether a value is an array.
+     */
+    function isArray(value) {
+        return Array.isArray ? Array.isArray(value) : value instanceof Array;
+    }
+    ts.isArray = isArray;
+    function toArray(value) {
+        return isArray(value) ? value : [value];
+    }
+    ts.toArray = toArray;
+    /**
+     * Tests whether a value is string
+     */
+    function isString(text) {
+        return typeof text === "string";
+    }
+    ts.isString = isString;
+    function tryCast(value, test) {
+        return value !== undefined && test(value) ? value : undefined;
+    }
+    ts.tryCast = tryCast;
+    function cast(value, test) {
+        if (value !== undefined && test(value))
+            return value;
+        return Debug.fail("Invalid cast. The supplied value " + value + " did not pass the test '" + Debug.getFunctionName(test) + "'.");
+    }
+    ts.cast = cast;
+    /** Does nothing. */
+    function noop(_) { } // tslint:disable-line no-empty
+    ts.noop = noop;
+    /** Do nothing and return false */
+    function returnFalse() { return false; }
+    ts.returnFalse = returnFalse;
+    /** Do nothing and return true */
+    function returnTrue() { return true; }
+    ts.returnTrue = returnTrue;
+    /** Returns its argument. */
+    function identity(x) { return x; }
+    ts.identity = identity;
+    /** Returns lower case string */
+    function toLowerCase(x) { return x.toLowerCase(); }
+    ts.toLowerCase = toLowerCase;
+    /** Throws an error because a function is not implemented. */
+    function notImplemented() {
+        throw new Error("Not implemented");
+    }
+    ts.notImplemented = notImplemented;
+    function memoize(callback) {
+        var value;
+        return function () {
+            if (callback) {
+                value = callback();
+                callback = undefined;
+            }
+            return value;
+        };
+    }
+    ts.memoize = memoize;
+    function chain(a, b, c, d, e) {
+        if (e) {
+            var args_2 = [];
+            for (var i = 0; i < arguments.length; i++) {
+                args_2[i] = arguments[i];
+            }
+            return function (t) { return compose.apply(void 0, map(args_2, function (f) { return f(t); })); };
+        }
+        else if (d) {
+            return function (t) { return compose(a(t), b(t), c(t), d(t)); };
+        }
+        else if (c) {
+            return function (t) { return compose(a(t), b(t), c(t)); };
+        }
+        else if (b) {
+            return function (t) { return compose(a(t), b(t)); };
+        }
+        else if (a) {
+            return function (t) { return compose(a(t)); };
+        }
+        else {
+            return function (_) { return function (u) { return u; }; };
+        }
+    }
+    ts.chain = chain;
+    function compose(a, b, c, d, e) {
+        if (e) {
+            var args_3 = [];
+            for (var i = 0; i < arguments.length; i++) {
+                args_3[i] = arguments[i];
+            }
+            return function (t) { return reduceLeft(args_3, function (u, f) { return f(u); }, t); };
+        }
+        else if (d) {
+            return function (t) { return d(c(b(a(t)))); };
+        }
+        else if (c) {
+            return function (t) { return c(b(a(t))); };
+        }
+        else if (b) {
+            return function (t) { return b(a(t)); };
+        }
+        else if (a) {
+            return function (t) { return a(t); };
+        }
+        else {
+            return function (t) { return t; };
+        }
+    }
+    ts.compose = compose;
+    var AssertionLevel;
+    (function (AssertionLevel) {
+        AssertionLevel[AssertionLevel["None"] = 0] = "None";
+        AssertionLevel[AssertionLevel["Normal"] = 1] = "Normal";
+        AssertionLevel[AssertionLevel["Aggressive"] = 2] = "Aggressive";
+        AssertionLevel[AssertionLevel["VeryAggressive"] = 3] = "VeryAggressive";
+    })(AssertionLevel = ts.AssertionLevel || (ts.AssertionLevel = {}));
+    var Debug;
+    (function (Debug) {
+        Debug.currentAssertionLevel = 0 /* None */;
+        Debug.isDebugging = false;
+        function shouldAssert(level) {
+            return Debug.currentAssertionLevel >= level;
+        }
+        Debug.shouldAssert = shouldAssert;
+        function assert(expression, message, verboseDebugInfo, stackCrawlMark) {
+            if (!expression) {
+                if (verboseDebugInfo) {
+                    message += "\r\nVerbose Debug Information: " + (typeof verboseDebugInfo === "string" ? verboseDebugInfo : verboseDebugInfo());
+                }
+                fail(message ? "False expression: " + message : "False expression.", stackCrawlMark || assert);
+            }
+        }
+        Debug.assert = assert;
+        function assertEqual(a, b, msg, msg2) {
+            if (a !== b) {
+                var message = msg ? msg2 ? msg + " " + msg2 : msg : "";
+                fail("Expected " + a + " === " + b + ". " + message);
+            }
+        }
+        Debug.assertEqual = assertEqual;
+        function assertLessThan(a, b, msg) {
+            if (a >= b) {
+                fail("Expected " + a + " < " + b + ". " + (msg || ""));
+            }
+        }
+        Debug.assertLessThan = assertLessThan;
+        function assertLessThanOrEqual(a, b) {
+            if (a > b) {
+                fail("Expected " + a + " <= " + b);
+            }
+        }
+        Debug.assertLessThanOrEqual = assertLessThanOrEqual;
+        function assertGreaterThanOrEqual(a, b) {
+            if (a < b) {
+                fail("Expected " + a + " >= " + b);
+            }
+        }
+        Debug.assertGreaterThanOrEqual = assertGreaterThanOrEqual;
+        function fail(message, stackCrawlMark) {
+            debugger;
+            var e = new Error(message ? "Debug Failure. " + message : "Debug Failure.");
+            if (Error.captureStackTrace) {
+                Error.captureStackTrace(e, stackCrawlMark || fail);
+            }
+            throw e;
+        }
+        Debug.fail = fail;
+        function assertDefined(value, message) {
+            if (value === undefined || value === null)
+                return fail(message);
+            return value;
+        }
+        Debug.assertDefined = assertDefined;
+        function assertEachDefined(value, message) {
+            for (var _i = 0, value_1 = value; _i < value_1.length; _i++) {
+                var v = value_1[_i];
+                assertDefined(v, message);
+            }
+            return value;
+        }
+        Debug.assertEachDefined = assertEachDefined;
+        function assertNever(member, message, stackCrawlMark) {
+            return fail(message || "Illegal value: " + member, stackCrawlMark || assertNever);
+        }
+        Debug.assertNever = assertNever;
+        function getFunctionName(func) {
+            if (typeof func !== "function") {
+                return "";
+            }
+            else if (func.hasOwnProperty("name")) {
+                return func.name;
+            }
+            else {
+                var text = Function.prototype.toString.call(func);
+                var match = /^function\s+([\w\$]+)\s*\(/.exec(text);
+                return match ? match[1] : "";
+            }
+        }
+        Debug.getFunctionName = getFunctionName;
+    })(Debug = ts.Debug || (ts.Debug = {}));
+    function equateValues(a, b) {
+        return a === b;
+    }
+    ts.equateValues = equateValues;
+    /**
+     * Compare the equality of two strings using a case-sensitive ordinal comparison.
+     *
+     * Case-sensitive comparisons compare both strings one code-point at a time using the integer
+     * value of each code-point after applying `toUpperCase` to each string. We always map both
+     * strings to their upper-case form as some unicode characters do not properly round-trip to
+     * lowercase (such as `ẞ` (German sharp capital s)).
+     */
+    function equateStringsCaseInsensitive(a, b) {
+        return a === b
+            || a !== undefined
+                && b !== undefined
+                && a.toUpperCase() === b.toUpperCase();
+    }
+    ts.equateStringsCaseInsensitive = equateStringsCaseInsensitive;
+    /**
+     * Compare the equality of two strings using a case-sensitive ordinal comparison.
+     *
+     * Case-sensitive comparisons compare both strings one code-point at a time using the
+     * integer value of each code-point.
+     */
+    function equateStringsCaseSensitive(a, b) {
+        return equateValues(a, b);
+    }
+    ts.equateStringsCaseSensitive = equateStringsCaseSensitive;
+    function compareComparableValues(a, b) {
+        return a === b ? 0 /* EqualTo */ :
+            a === undefined ? -1 /* LessThan */ :
+                b === undefined ? 1 /* GreaterThan */ :
+                    a < b ? -1 /* LessThan */ :
+                        1 /* GreaterThan */;
+    }
+    /**
+     * Compare two numeric values for their order relative to each other.
+     * To compare strings, use any of the `compareStrings` functions.
+     */
+    function compareValues(a, b) {
+        return compareComparableValues(a, b);
+    }
+    ts.compareValues = compareValues;
+    function min(a, b, compare) {
+        return compare(a, b) === -1 /* LessThan */ ? a : b;
+    }
+    ts.min = min;
+    /**
+     * Compare two strings using a case-insensitive ordinal comparison.
+     *
+     * Ordinal comparisons are based on the difference between the unicode code points of both
+     * strings. Characters with multiple unicode representations are considered unequal. Ordinal
+     * comparisons provide predictable ordering, but place "a" after "B".
+     *
+     * Case-insensitive comparisons compare both strings one code-point at a time using the integer
+     * value of each code-point after applying `toUpperCase` to each string. We always map both
+     * strings to their upper-case form as some unicode characters do not properly round-trip to
+     * lowercase (such as `ẞ` (German sharp capital s)).
+     */
+    function compareStringsCaseInsensitive(a, b) {
+        if (a === b)
+            return 0 /* EqualTo */;
+        if (a === undefined)
+            return -1 /* LessThan */;
+        if (b === undefined)
+            return 1 /* GreaterThan */;
+        a = a.toUpperCase();
+        b = b.toUpperCase();
+        return a < b ? -1 /* LessThan */ : a > b ? 1 /* GreaterThan */ : 0 /* EqualTo */;
+    }
+    ts.compareStringsCaseInsensitive = compareStringsCaseInsensitive;
+    /**
+     * Compare two strings using a case-sensitive ordinal comparison.
+     *
+     * Ordinal comparisons are based on the difference between the unicode code points of both
+     * strings. Characters with multiple unicode representations are considered unequal. Ordinal
+     * comparisons provide predictable ordering, but place "a" after "B".
+     *
+     * Case-sensitive comparisons compare both strings one code-point at a time using the integer
+     * value of each code-point.
+     */
+    function compareStringsCaseSensitive(a, b) {
+        return compareComparableValues(a, b);
+    }
+    ts.compareStringsCaseSensitive = compareStringsCaseSensitive;
+    function getStringComparer(ignoreCase) {
+        return ignoreCase ? compareStringsCaseInsensitive : compareStringsCaseSensitive;
+    }
+    ts.getStringComparer = getStringComparer;
+    /**
+     * Creates a string comparer for use with string collation in the UI.
+     */
+    var createUIStringComparer = (function () {
+        var defaultComparer;
+        var enUSComparer;
+        var stringComparerFactory = getStringComparerFactory();
+        return createStringComparer;
+        function compareWithCallback(a, b, comparer) {
+            if (a === b)
+                return 0 /* EqualTo */;
+            if (a === undefined)
+                return -1 /* LessThan */;
+            if (b === undefined)
+                return 1 /* GreaterThan */;
+            var value = comparer(a, b);
+            return value < 0 ? -1 /* LessThan */ : value > 0 ? 1 /* GreaterThan */ : 0 /* EqualTo */;
+        }
+        function createIntlCollatorStringComparer(locale) {
+            // Intl.Collator.prototype.compare is bound to the collator. See NOTE in
+            // http://www.ecma-international.org/ecma-402/2.0/#sec-Intl.Collator.prototype.compare
+            var comparer = new Intl.Collator(locale, { usage: "sort", sensitivity: "variant" }).compare;
+            return function (a, b) { return compareWithCallback(a, b, comparer); };
+        }
+        function createLocaleCompareStringComparer(locale) {
+            // if the locale is not the default locale (`undefined`), use the fallback comparer.
+            if (locale !== undefined)
+                return createFallbackStringComparer();
+            return function (a, b) { return compareWithCallback(a, b, compareStrings); };
+            function compareStrings(a, b) {
+                return a.localeCompare(b);
+            }
+        }
+        function createFallbackStringComparer() {
+            // An ordinal comparison puts "A" after "b", but for the UI we want "A" before "b".
+            // We first sort case insensitively.  So "Aaa" will come before "baa".
+            // Then we sort case sensitively, so "aaa" will come before "Aaa".
+            //
+            // For case insensitive comparisons we always map both strings to their
+            // upper-case form as some unicode characters do not properly round-trip to
+            // lowercase (such as `ẞ` (German sharp capital s)).
+            return function (a, b) { return compareWithCallback(a, b, compareDictionaryOrder); };
+            function compareDictionaryOrder(a, b) {
+                return compareStrings(a.toUpperCase(), b.toUpperCase()) || compareStrings(a, b);
+            }
+            function compareStrings(a, b) {
+                return a < b ? -1 /* LessThan */ : a > b ? 1 /* GreaterThan */ : 0 /* EqualTo */;
+            }
+        }
+        function getStringComparerFactory() {
+            // If the host supports Intl, we use it for comparisons using the default locale.
+            if (typeof Intl === "object" && typeof Intl.Collator === "function") {
+                return createIntlCollatorStringComparer;
+            }
+            // If the host does not support Intl, we fall back to localeCompare.
+            // localeCompare in Node v0.10 is just an ordinal comparison, so don't use it.
+            if (typeof String.prototype.localeCompare === "function" &&
+                typeof String.prototype.toLocaleUpperCase === "function" &&
+                "a".localeCompare("B") < 0) {
+                return createLocaleCompareStringComparer;
+            }
+            // Otherwise, fall back to ordinal comparison:
+            return createFallbackStringComparer;
+        }
+        function createStringComparer(locale) {
+            // Hold onto common string comparers. This avoids constantly reallocating comparers during
+            // tests.
+            if (locale === undefined) {
+                return defaultComparer || (defaultComparer = stringComparerFactory(locale));
+            }
+            else if (locale === "en-US") {
+                return enUSComparer || (enUSComparer = stringComparerFactory(locale));
+            }
+            else {
+                return stringComparerFactory(locale);
+            }
+        }
+    })();
+    var uiComparerCaseSensitive;
+    var uiLocale;
+    function getUILocale() {
+        return uiLocale;
+    }
+    ts.getUILocale = getUILocale;
+    function setUILocale(value) {
+        if (uiLocale !== value) {
+            uiLocale = value;
+            uiComparerCaseSensitive = undefined;
+        }
+    }
+    ts.setUILocale = setUILocale;
+    /**
+     * Compare two strings in a using the case-sensitive sort behavior of the UI locale.
+     *
+     * Ordering is not predictable between different host locales, but is best for displaying
+     * ordered data for UI presentation. Characters with multiple unicode representations may
+     * be considered equal.
+     *
+     * Case-sensitive comparisons compare strings that differ in base characters, or
+     * accents/diacritic marks, or case as unequal.
+     */
+    function compareStringsCaseSensitiveUI(a, b) {
+        var comparer = uiComparerCaseSensitive || (uiComparerCaseSensitive = createUIStringComparer(uiLocale));
+        return comparer(a, b);
+    }
+    ts.compareStringsCaseSensitiveUI = compareStringsCaseSensitiveUI;
+    function compareProperties(a, b, key, comparer) {
+        return a === b ? 0 /* EqualTo */ :
+            a === undefined ? -1 /* LessThan */ :
+                b === undefined ? 1 /* GreaterThan */ :
+                    comparer(a[key], b[key]);
+    }
+    ts.compareProperties = compareProperties;
+    /** True is greater than false. */
+    function compareBooleans(a, b) {
+        return compareValues(a ? 1 : 0, b ? 1 : 0);
+    }
+    ts.compareBooleans = compareBooleans;
+    /**
+     * Given a name and a list of names that are *not* equal to the name, return a spelling suggestion if there is one that is close enough.
+     * Names less than length 3 only check for case-insensitive equality, not Levenshtein distance.
+     *
+     * If there is a candidate that's the same except for case, return that.
+     * If there is a candidate that's within one edit of the name, return that.
+     * Otherwise, return the candidate with the smallest Levenshtein distance,
+     *    except for candidates:
+     *      * With no name
+     *      * Whose length differs from the target name by more than 0.34 of the length of the name.
+     *      * Whose levenshtein distance is more than 0.4 of the length of the name
+     *        (0.4 allows 1 substitution/transposition for every 5 characters,
+     *         and 1 insertion/deletion at 3 characters)
+     */
+    function getSpellingSuggestion(name, candidates, getName) {
+        var maximumLengthDifference = Math.min(2, Math.floor(name.length * 0.34));
+        var bestDistance = Math.floor(name.length * 0.4) + 1; // If the best result isn't better than this, don't bother.
+        var bestCandidate;
+        var justCheckExactMatches = false;
+        var nameLowerCase = name.toLowerCase();
+        for (var _i = 0, candidates_1 = candidates; _i < candidates_1.length; _i++) {
+            var candidate = candidates_1[_i];
+            var candidateName = getName(candidate);
+            if (candidateName !== undefined && Math.abs(candidateName.length - nameLowerCase.length) <= maximumLengthDifference) {
+                var candidateNameLowerCase = candidateName.toLowerCase();
+                if (candidateNameLowerCase === nameLowerCase) {
+                    return candidate;
+                }
+                if (justCheckExactMatches) {
+                    continue;
+                }
+                if (candidateName.length < 3) {
+                    // Don't bother, user would have noticed a 2-character name having an extra character
+                    continue;
+                }
+                // Only care about a result better than the best so far.
+                var distance = levenshteinWithMax(nameLowerCase, candidateNameLowerCase, bestDistance - 1);
+                if (distance === undefined) {
+                    continue;
+                }
+                if (distance < 3) {
+                    justCheckExactMatches = true;
+                    bestCandidate = candidate;
+                }
+                else {
+                    Debug.assert(distance < bestDistance); // Else `levenshteinWithMax` should return undefined
+                    bestDistance = distance;
+                    bestCandidate = candidate;
+                }
+            }
+        }
+        return bestCandidate;
+    }
+    ts.getSpellingSuggestion = getSpellingSuggestion;
+    function levenshteinWithMax(s1, s2, max) {
+        var previous = new Array(s2.length + 1);
+        var current = new Array(s2.length + 1);
+        /** Represents any value > max. We don't care about the particular value. */
+        var big = max + 1;
+        for (var i = 0; i <= s2.length; i++) {
+            previous[i] = i;
+        }
+        for (var i = 1; i <= s1.length; i++) {
+            var c1 = s1.charCodeAt(i - 1);
+            var minJ = i > max ? i - max : 1;
+            var maxJ = s2.length > max + i ? max + i : s2.length;
+            current[0] = i;
+            /** Smallest value of the matrix in the ith column. */
+            var colMin = i;
+            for (var j = 1; j < minJ; j++) {
+                current[j] = big;
+            }
+            for (var j = minJ; j <= maxJ; j++) {
+                var dist = c1 === s2.charCodeAt(j - 1)
+                    ? previous[j - 1]
+                    : Math.min(/*delete*/ previous[j] + 1, /*insert*/ current[j - 1] + 1, /*substitute*/ previous[j - 1] + 2);
+                current[j] = dist;
+                colMin = Math.min(colMin, dist);
+            }
+            for (var j = maxJ + 1; j <= s2.length; j++) {
+                current[j] = big;
+            }
+            if (colMin > max) {
+                // Give up -- everything in this column is > max and it can't get better in future columns.
+                return undefined;
+            }
+            var temp = previous;
+            previous = current;
+            current = temp;
+        }
+        var res = previous[s2.length];
+        return res > max ? undefined : res;
+    }
+    function endsWith(str, suffix) {
+        var expectedPos = str.length - suffix.length;
+        return expectedPos >= 0 && str.indexOf(suffix, expectedPos) === expectedPos;
+    }
+    ts.endsWith = endsWith;
+    function removeSuffix(str, suffix) {
+        return endsWith(str, suffix) ? str.slice(0, str.length - suffix.length) : str;
+    }
+    ts.removeSuffix = removeSuffix;
+    function tryRemoveSuffix(str, suffix) {
+        return endsWith(str, suffix) ? str.slice(0, str.length - suffix.length) : undefined;
+    }
+    ts.tryRemoveSuffix = tryRemoveSuffix;
+    function stringContains(str, substring) {
+        return str.indexOf(substring) !== -1;
+    }
+    ts.stringContains = stringContains;
+    function fileExtensionIs(path, extension) {
+        return path.length > extension.length && endsWith(path, extension);
+    }
+    ts.fileExtensionIs = fileExtensionIs;
+    function fileExtensionIsOneOf(path, extensions) {
+        for (var _i = 0, extensions_1 = extensions; _i < extensions_1.length; _i++) {
+            var extension = extensions_1[_i];
+            if (fileExtensionIs(path, extension)) {
+                return true;
+            }
+        }
+        return false;
+    }
+    ts.fileExtensionIsOneOf = fileExtensionIsOneOf;
+    /**
+     * Takes a string like "jquery-min.4.2.3" and returns "jquery"
+     */
+    function removeMinAndVersionNumbers(fileName) {
+        // Match a "." or "-" followed by a version number or 'min' at the end of the name
+        var trailingMinOrVersion = /[.-]((min)|(\d+(\.\d+)*))$/;
+        // The "min" or version may both be present, in either order, so try applying the above twice.
+        return fileName.replace(trailingMinOrVersion, "").replace(trailingMinOrVersion, "");
+    }
+    ts.removeMinAndVersionNumbers = removeMinAndVersionNumbers;
+    /** Remove an item from an array, moving everything to its right one space left. */
+    function orderedRemoveItem(array, item) {
+        for (var i = 0; i < array.length; i++) {
+            if (array[i] === item) {
+                orderedRemoveItemAt(array, i);
+                return true;
+            }
+        }
+        return false;
+    }
+    ts.orderedRemoveItem = orderedRemoveItem;
+    /** Remove an item by index from an array, moving everything to its right one space left. */
+    function orderedRemoveItemAt(array, index) {
+        // This seems to be faster than either `array.splice(i, 1)` or `array.copyWithin(i, i+ 1)`.
+        for (var i = index; i < array.length - 1; i++) {
+            array[i] = array[i + 1];
+        }
+        array.pop();
+    }
+    ts.orderedRemoveItemAt = orderedRemoveItemAt;
+    function unorderedRemoveItemAt(array, index) {
+        // Fill in the "hole" left at `index`.
+        array[index] = array[array.length - 1];
+        array.pop();
+    }
+    ts.unorderedRemoveItemAt = unorderedRemoveItemAt;
+    /** Remove the *first* occurrence of `item` from the array. */
+    function unorderedRemoveItem(array, item) {
+        return unorderedRemoveFirstItemWhere(array, function (element) { return element === item; });
+    }
+    ts.unorderedRemoveItem = unorderedRemoveItem;
+    /** Remove the *first* element satisfying `predicate`. */
+    function unorderedRemoveFirstItemWhere(array, predicate) {
+        for (var i = 0; i < array.length; i++) {
+            if (predicate(array[i])) {
+                unorderedRemoveItemAt(array, i);
+                return true;
+            }
+        }
+        return false;
+    }
+    function createGetCanonicalFileName(useCaseSensitiveFileNames) {
+        return useCaseSensitiveFileNames ? identity : toLowerCase;
+    }
+    ts.createGetCanonicalFileName = createGetCanonicalFileName;
+    function patternText(_a) {
+        var prefix = _a.prefix, suffix = _a.suffix;
+        return prefix + "*" + suffix;
+    }
+    ts.patternText = patternText;
+    /**
+     * Given that candidate matches pattern, returns the text matching the '*'.
+     * E.g.: matchedText(tryParsePattern("foo*baz"), "foobarbaz") === "bar"
+     */
+    function matchedText(pattern, candidate) {
+        Debug.assert(isPatternMatch(pattern, candidate));
+        return candidate.substring(pattern.prefix.length, candidate.length - pattern.suffix.length);
+    }
+    ts.matchedText = matchedText;
+    /** Return the object corresponding to the best pattern to match `candidate`. */
+    function findBestPatternMatch(values, getPattern, candidate) {
+        var matchedValue;
+        // use length of prefix as betterness criteria
+        var longestMatchPrefixLength = -1;
+        for (var _i = 0, values_2 = values; _i < values_2.length; _i++) {
+            var v = values_2[_i];
+            var pattern = getPattern(v);
+            if (isPatternMatch(pattern, candidate) && pattern.prefix.length > longestMatchPrefixLength) {
+                longestMatchPrefixLength = pattern.prefix.length;
+                matchedValue = v;
+            }
+        }
+        return matchedValue;
+    }
+    ts.findBestPatternMatch = findBestPatternMatch;
+    function startsWith(str, prefix) {
+        return str.lastIndexOf(prefix, 0) === 0;
+    }
+    ts.startsWith = startsWith;
+    function removePrefix(str, prefix) {
+        return startsWith(str, prefix) ? str.substr(prefix.length) : str;
+    }
+    ts.removePrefix = removePrefix;
+    function tryRemovePrefix(str, prefix) {
+        return startsWith(str, prefix) ? str.substring(prefix.length) : undefined;
+    }
+    ts.tryRemovePrefix = tryRemovePrefix;
+    function isPatternMatch(_a, candidate) {
+        var prefix = _a.prefix, suffix = _a.suffix;
+        return candidate.length >= prefix.length + suffix.length &&
+            startsWith(candidate, prefix) &&
+            endsWith(candidate, suffix);
+    }
+    function and(f, g) {
+        return function (arg) { return f(arg) && g(arg); };
+    }
+    ts.and = and;
+    function or(f, g) {
+        return function (arg) { return f(arg) || g(arg); };
+    }
+    ts.or = or;
+    function assertTypeIsNever(_) { } // tslint:disable-line no-empty
+    ts.assertTypeIsNever = assertTypeIsNever;
+    function singleElementArray(t) {
+        return t === undefined ? undefined : [t];
+    }
+    ts.singleElementArray = singleElementArray;
+    function enumerateInsertsAndDeletes(newItems, oldItems, comparer, inserted, deleted, unchanged) {
+        unchanged = unchanged || noop;
+        var newIndex = 0;
+        var oldIndex = 0;
+        var newLen = newItems.length;
+        var oldLen = oldItems.length;
+        while (newIndex < newLen && oldIndex < oldLen) {
+            var newItem = newItems[newIndex];
+            var oldItem = oldItems[oldIndex];
+            var compareResult = comparer(newItem, oldItem);
+            if (compareResult === -1 /* LessThan */) {
+                inserted(newItem);
+                newIndex++;
+            }
+            else if (compareResult === 1 /* GreaterThan */) {
+                deleted(oldItem);
+                oldIndex++;
+            }
+            else {
+                unchanged(oldItem, newItem);
+                newIndex++;
+                oldIndex++;
+            }
+        }
+        while (newIndex < newLen) {
+            inserted(newItems[newIndex++]);
+        }
+        while (oldIndex < oldLen) {
+            deleted(oldItems[oldIndex++]);
+        }
+    }
+    ts.enumerateInsertsAndDeletes = enumerateInsertsAndDeletes;
+})(ts || (ts = {}));
+//# sourceMappingURL=core.js.map
 "use strict";
 var __assign = (this && this.__assign) || Object.assign || function(t) {
     for (var s, i = 1, n = arguments.length; i < n; i++) {
@@ -22,29 +1979,8 @@ var __assign = (this && this.__assign) || Object.assign || function(t) {
     }
     return t;
 };
-var __makeTemplateObject = (this && this.__makeTemplateObject) || function (cooked, raw) {
-    if (Object.defineProperty) { Object.defineProperty(cooked, "raw", { value: raw }); } else { cooked.raw = raw; }
-    return cooked;
-};
-var __extends = (this && this.__extends) || (function () {
-    var extendStatics = Object.setPrototypeOf ||
-        ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
-        function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
-    return function (d, b) {
-        extendStatics(d, b);
-        function __() { this.constructor = d; }
-        d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
-    };
-})();
 var ts;
 (function (ts) {
-    /* @internal */
-    var Comparison;
-    (function (Comparison) {
-        Comparison[Comparison["LessThan"] = -1] = "LessThan";
-        Comparison[Comparison["EqualTo"] = 0] = "EqualTo";
-        Comparison[Comparison["GreaterThan"] = 1] = "GreaterThan";
-    })(Comparison = ts.Comparison || (ts.Comparison = {}));
     // token > SyntaxKind.Identifier => token is a keyword
     // Also, If you add a new SyntaxKind be sure to keep the `Markers` section at the bottom in sync
     var SyntaxKind;
@@ -1517,6 +3453,7 @@ var ts;
         "reference": {
             args: [
                 { name: "types", optional: true, captureSpan: true },
+                { name: "lib", optional: true, captureSpan: true },
                 { name: "path", optional: true, captureSpan: true },
                 { name: "no-default-lib", optional: true }
             ],
@@ -1542,3216 +3479,6 @@ var ts;
         },
     });
 })(ts || (ts = {}));
-/*@internal*/
-var ts;
-(function (ts) {
-    /** Gets a timestamp with (at least) ms resolution */
-    ts.timestamp = typeof performance !== "undefined" && performance.now ? function () { return performance.now(); } : Date.now ? Date.now : function () { return +(new Date()); };
-})(ts || (ts = {}));
-/*@internal*/
-/** Performance measurements for the compiler. */
-(function (ts) {
-    var performance;
-    (function (performance) {
-        // NOTE: cannot use ts.noop as core.ts loads after this
-        var profilerEvent = typeof onProfilerEvent === "function" && onProfilerEvent.profiler === true ? onProfilerEvent : function () { };
-        var enabled = false;
-        var profilerStart = 0;
-        var counts;
-        var marks;
-        var measures;
-        /**
-         * Marks a performance event.
-         *
-         * @param markName The name of the mark.
-         */
-        function mark(markName) {
-            if (enabled) {
-                marks.set(markName, ts.timestamp());
-                counts.set(markName, (counts.get(markName) || 0) + 1);
-                profilerEvent(markName);
-            }
-        }
-        performance.mark = mark;
-        /**
-         * Adds a performance measurement with the specified name.
-         *
-         * @param measureName The name of the performance measurement.
-         * @param startMarkName The name of the starting mark. If not supplied, the point at which the
-         *      profiler was enabled is used.
-         * @param endMarkName The name of the ending mark. If not supplied, the current timestamp is
-         *      used.
-         */
-        function measure(measureName, startMarkName, endMarkName) {
-            if (enabled) {
-                var end = endMarkName && marks.get(endMarkName) || ts.timestamp();
-                var start = startMarkName && marks.get(startMarkName) || profilerStart;
-                measures.set(measureName, (measures.get(measureName) || 0) + (end - start));
-            }
-        }
-        performance.measure = measure;
-        /**
-         * Gets the number of times a marker was encountered.
-         *
-         * @param markName The name of the mark.
-         */
-        function getCount(markName) {
-            return counts && counts.get(markName) || 0;
-        }
-        performance.getCount = getCount;
-        /**
-         * Gets the total duration of all measurements with the supplied name.
-         *
-         * @param measureName The name of the measure whose durations should be accumulated.
-         */
-        function getDuration(measureName) {
-            return measures && measures.get(measureName) || 0;
-        }
-        performance.getDuration = getDuration;
-        /**
-         * Iterate over each measure, performing some action
-         *
-         * @param cb The action to perform for each measure
-         */
-        function forEachMeasure(cb) {
-            measures.forEach(function (measure, key) {
-                cb(key, measure);
-            });
-        }
-        performance.forEachMeasure = forEachMeasure;
-        /** Enables (and resets) performance measurements for the compiler. */
-        function enable() {
-            counts = ts.createMap();
-            marks = ts.createMap();
-            measures = ts.createMap();
-            enabled = true;
-            profilerStart = ts.timestamp();
-        }
-        performance.enable = enable;
-        /** Disables performance measurements for the compiler. */
-        function disable() {
-            enabled = false;
-        }
-        performance.disable = disable;
-    })(performance = ts.performance || (ts.performance = {}));
-})(ts || (ts = {}));
-var ts;
-(function (ts) {
-    // WARNING: The script `configureNightly.ts` uses a regexp to parse out these values.
-    // If changing the text in this section, be sure to test `configureNightly` too.
-    ts.versionMajorMinor = "3.0";
-    /** The version of the TypeScript compiler release */
-    ts.version = ts.versionMajorMinor + ".0-dev";
-})(ts || (ts = {}));
-(function (ts) {
-    function isExternalModuleNameRelative(moduleName) {
-        // TypeScript 1.0 spec (April 2014): 11.2.1
-        // An external module name is "relative" if the first term is "." or "..".
-        // Update: We also consider a path like `C:\foo.ts` "relative" because we do not search for it in `node_modules` or treat it as an ambient module.
-        return ts.pathIsRelative(moduleName) || ts.isRootedDiskPath(moduleName);
-    }
-    ts.isExternalModuleNameRelative = isExternalModuleNameRelative;
-    function sortAndDeduplicateDiagnostics(diagnostics) {
-        return ts.sortAndDeduplicate(diagnostics, ts.compareDiagnostics);
-    }
-    ts.sortAndDeduplicateDiagnostics = sortAndDeduplicateDiagnostics;
-})(ts || (ts = {}));
-/* @internal */
-(function (ts) {
-    ts.emptyArray = [];
-    function closeFileWatcher(watcher) {
-        watcher.close();
-    }
-    ts.closeFileWatcher = closeFileWatcher;
-    /** Create a MapLike with good performance. */
-    function createDictionaryObject() {
-        var map = Object.create(/*prototype*/ null); // tslint:disable-line:no-null-keyword
-        // Using 'delete' on an object causes V8 to put the object in dictionary mode.
-        // This disables creation of hidden classes, which are expensive when an object is
-        // constantly changing shape.
-        map.__ = undefined;
-        delete map.__;
-        return map;
-    }
-    /** Create a new map. If a template object is provided, the map will copy entries from it. */
-    function createMap() {
-        return new MapCtr();
-    }
-    ts.createMap = createMap;
-    /** Create a new escaped identifier map. */
-    function createUnderscoreEscapedMap() {
-        return new MapCtr();
-    }
-    ts.createUnderscoreEscapedMap = createUnderscoreEscapedMap;
-    function createSymbolTable(symbols) {
-        var result = createMap();
-        if (symbols) {
-            for (var _i = 0, symbols_1 = symbols; _i < symbols_1.length; _i++) {
-                var symbol = symbols_1[_i];
-                result.set(symbol.escapedName, symbol);
-            }
-        }
-        return result;
-    }
-    ts.createSymbolTable = createSymbolTable;
-    function createMapFromTemplate(template) {
-        var map = new MapCtr();
-        // Copies keys/values from template. Note that for..in will not throw if
-        // template is undefined, and instead will just exit the loop.
-        for (var key in template) {
-            if (hasOwnProperty.call(template, key)) {
-                map.set(key, template[key]);
-            }
-        }
-        return map;
-    }
-    ts.createMapFromTemplate = createMapFromTemplate;
-    // Internet Explorer's Map doesn't support iteration, so don't use it.
-    // tslint:disable-next-line no-in-operator variable-name
-    var MapCtr = typeof Map !== "undefined" && "entries" in Map.prototype ? Map : shimMap();
-    // Keep the class inside a function so it doesn't get compiled if it's not used.
-    function shimMap() {
-        var MapIterator = /** @class */ (function () {
-            function MapIterator(data, selector) {
-                this.index = 0;
-                this.data = data;
-                this.selector = selector;
-                this.keys = Object.keys(data);
-            }
-            MapIterator.prototype.next = function () {
-                var index = this.index;
-                if (index < this.keys.length) {
-                    this.index++;
-                    return { value: this.selector(this.data, this.keys[index]), done: false };
-                }
-                return { value: undefined, done: true };
-            };
-            return MapIterator;
-        }());
-        return /** @class */ (function () {
-            function class_1() {
-                this.data = createDictionaryObject();
-                this.size = 0;
-            }
-            class_1.prototype.get = function (key) {
-                return this.data[key];
-            };
-            class_1.prototype.set = function (key, value) {
-                if (!this.has(key)) {
-                    this.size++;
-                }
-                this.data[key] = value;
-                return this;
-            };
-            class_1.prototype.has = function (key) {
-                // tslint:disable-next-line:no-in-operator
-                return key in this.data;
-            };
-            class_1.prototype.delete = function (key) {
-                if (this.has(key)) {
-                    this.size--;
-                    delete this.data[key];
-                    return true;
-                }
-                return false;
-            };
-            class_1.prototype.clear = function () {
-                this.data = createDictionaryObject();
-                this.size = 0;
-            };
-            class_1.prototype.keys = function () {
-                return new MapIterator(this.data, function (_data, key) { return key; });
-            };
-            class_1.prototype.values = function () {
-                return new MapIterator(this.data, function (data, key) { return data[key]; });
-            };
-            class_1.prototype.entries = function () {
-                return new MapIterator(this.data, function (data, key) { return [key, data[key]]; });
-            };
-            class_1.prototype.forEach = function (action) {
-                for (var key in this.data) {
-                    action(this.data[key], key);
-                }
-            };
-            return class_1;
-        }());
-    }
-    function toPath(fileName, basePath, getCanonicalFileName) {
-        var nonCanonicalizedPath = isRootedDiskPath(fileName)
-            ? normalizePath(fileName)
-            : getNormalizedAbsolutePath(fileName, basePath);
-        return getCanonicalFileName(nonCanonicalizedPath);
-    }
-    ts.toPath = toPath;
-    function length(array) {
-        return array ? array.length : 0;
-    }
-    ts.length = length;
-    function hasEntries(map) {
-        return !!map && !!map.size;
-    }
-    ts.hasEntries = hasEntries;
-    /**
-     * Iterates through 'array' by index and performs the callback on each element of array until the callback
-     * returns a truthy value, then returns that value.
-     * If no such value is found, the callback is applied to each element of array and undefined is returned.
-     */
-    function forEach(array, callback) {
-        if (array) {
-            for (var i = 0; i < array.length; i++) {
-                var result = callback(array[i], i);
-                if (result) {
-                    return result;
-                }
-            }
-        }
-        return undefined;
-    }
-    ts.forEach = forEach;
-    /** Like `forEach`, but suitable for use with numbers and strings (which may be falsy). */
-    function firstDefined(array, callback) {
-        if (array === undefined) {
-            return undefined;
-        }
-        for (var i = 0; i < array.length; i++) {
-            var result = callback(array[i], i);
-            if (result !== undefined) {
-                return result;
-            }
-        }
-        return undefined;
-    }
-    ts.firstDefined = firstDefined;
-    function firstDefinedIterator(iter, callback) {
-        while (true) {
-            var _a = iter.next(), value = _a.value, done = _a.done;
-            if (done) {
-                return undefined;
-            }
-            var result = callback(value);
-            if (result !== undefined) {
-                return result;
-            }
-        }
-    }
-    ts.firstDefinedIterator = firstDefinedIterator;
-    function findAncestor(node, callback) {
-        while (node) {
-            var result = callback(node);
-            if (result === "quit") {
-                return undefined;
-            }
-            else if (result) {
-                return node;
-            }
-            node = node.parent;
-        }
-        return undefined;
-    }
-    ts.findAncestor = findAncestor;
-    function zipWith(arrayA, arrayB, callback) {
-        var result = [];
-        Debug.assertEqual(arrayA.length, arrayB.length);
-        for (var i = 0; i < arrayA.length; i++) {
-            result.push(callback(arrayA[i], arrayB[i], i));
-        }
-        return result;
-    }
-    ts.zipWith = zipWith;
-    function zipToIterator(arrayA, arrayB) {
-        Debug.assertEqual(arrayA.length, arrayB.length);
-        var i = 0;
-        return {
-            next: function () {
-                if (i === arrayA.length) {
-                    return { value: undefined, done: true };
-                }
-                i++;
-                return { value: [arrayA[i - 1], arrayB[i - 1]], done: false };
-            }
-        };
-    }
-    ts.zipToIterator = zipToIterator;
-    function zipToMap(keys, values) {
-        Debug.assert(keys.length === values.length);
-        var map = createMap();
-        for (var i = 0; i < keys.length; ++i) {
-            map.set(keys[i], values[i]);
-        }
-        return map;
-    }
-    ts.zipToMap = zipToMap;
-    /**
-     * Iterates through `array` by index and performs the callback on each element of array until the callback
-     * returns a falsey value, then returns false.
-     * If no such value is found, the callback is applied to each element of array and `true` is returned.
-     */
-    function every(array, callback) {
-        if (array) {
-            for (var i = 0; i < array.length; i++) {
-                if (!callback(array[i], i)) {
-                    return false;
-                }
-            }
-        }
-        return true;
-    }
-    ts.every = every;
-    function find(array, predicate) {
-        for (var i = 0; i < array.length; i++) {
-            var value = array[i];
-            if (predicate(value, i)) {
-                return value;
-            }
-        }
-        return undefined;
-    }
-    ts.find = find;
-    function findLast(array, predicate) {
-        for (var i = array.length - 1; i >= 0; i--) {
-            var value = array[i];
-            if (predicate(value, i)) {
-                return value;
-            }
-        }
-        return undefined;
-    }
-    ts.findLast = findLast;
-    /** Works like Array.prototype.findIndex, returning `-1` if no element satisfying the predicate is found. */
-    function findIndex(array, predicate, startIndex) {
-        for (var i = startIndex || 0; i < array.length; i++) {
-            if (predicate(array[i], i)) {
-                return i;
-            }
-        }
-        return -1;
-    }
-    ts.findIndex = findIndex;
-    function findLastIndex(array, predicate, startIndex) {
-        for (var i = startIndex === undefined ? array.length - 1 : startIndex; i >= 0; i--) {
-            if (predicate(array[i], i)) {
-                return i;
-            }
-        }
-        return -1;
-    }
-    ts.findLastIndex = findLastIndex;
-    /**
-     * Returns the first truthy result of `callback`, or else fails.
-     * This is like `forEach`, but never returns undefined.
-     */
-    function findMap(array, callback) {
-        for (var i = 0; i < array.length; i++) {
-            var result = callback(array[i], i);
-            if (result) {
-                return result;
-            }
-        }
-        return Debug.fail();
-    }
-    ts.findMap = findMap;
-    function contains(array, value, equalityComparer) {
-        if (equalityComparer === void 0) { equalityComparer = equateValues; }
-        if (array) {
-            for (var _i = 0, array_1 = array; _i < array_1.length; _i++) {
-                var v = array_1[_i];
-                if (equalityComparer(v, value)) {
-                    return true;
-                }
-            }
-        }
-        return false;
-    }
-    ts.contains = contains;
-    function arraysEqual(a, b, equalityComparer) {
-        if (equalityComparer === void 0) { equalityComparer = equateValues; }
-        return a.length === b.length && a.every(function (x, i) { return equalityComparer(x, b[i]); });
-    }
-    ts.arraysEqual = arraysEqual;
-    function indexOfAnyCharCode(text, charCodes, start) {
-        for (var i = start || 0; i < text.length; i++) {
-            if (contains(charCodes, text.charCodeAt(i))) {
-                return i;
-            }
-        }
-        return -1;
-    }
-    ts.indexOfAnyCharCode = indexOfAnyCharCode;
-    function countWhere(array, predicate) {
-        var count = 0;
-        if (array) {
-            for (var i = 0; i < array.length; i++) {
-                var v = array[i];
-                if (predicate(v, i)) {
-                    count++;
-                }
-            }
-        }
-        return count;
-    }
-    ts.countWhere = countWhere;
-    function filter(array, f) {
-        if (array) {
-            var len = array.length;
-            var i = 0;
-            while (i < len && f(array[i]))
-                i++;
-            if (i < len) {
-                var result = array.slice(0, i);
-                i++;
-                while (i < len) {
-                    var item = array[i];
-                    if (f(item)) {
-                        result.push(item);
-                    }
-                    i++;
-                }
-                return result;
-            }
-        }
-        return array;
-    }
-    ts.filter = filter;
-    function filterMutate(array, f) {
-        var outIndex = 0;
-        for (var i = 0; i < array.length; i++) {
-            if (f(array[i], i, array)) {
-                array[outIndex] = array[i];
-                outIndex++;
-            }
-        }
-        array.length = outIndex;
-    }
-    ts.filterMutate = filterMutate;
-    function clear(array) {
-        array.length = 0;
-    }
-    ts.clear = clear;
-    function map(array, f) {
-        var result;
-        if (array) {
-            result = [];
-            for (var i = 0; i < array.length; i++) {
-                result.push(f(array[i], i));
-            }
-        }
-        return result;
-    }
-    ts.map = map;
-    function mapIterator(iter, mapFn) {
-        return {
-            next: function () {
-                var iterRes = iter.next();
-                return iterRes.done ? iterRes : { value: mapFn(iterRes.value), done: false };
-            }
-        };
-    }
-    ts.mapIterator = mapIterator;
-    function sameMap(array, f) {
-        if (array) {
-            for (var i = 0; i < array.length; i++) {
-                var item = array[i];
-                var mapped = f(item, i);
-                if (item !== mapped) {
-                    var result = array.slice(0, i);
-                    result.push(mapped);
-                    for (i++; i < array.length; i++) {
-                        result.push(f(array[i], i));
-                    }
-                    return result;
-                }
-            }
-        }
-        return array;
-    }
-    ts.sameMap = sameMap;
-    function flatten(array) {
-        var result;
-        if (array) {
-            result = [];
-            for (var _i = 0, array_2 = array; _i < array_2.length; _i++) {
-                var v = array_2[_i];
-                if (v) {
-                    if (isArray(v)) {
-                        addRange(result, v);
-                    }
-                    else {
-                        result.push(v);
-                    }
-                }
-            }
-        }
-        return result;
-    }
-    ts.flatten = flatten;
-    function flatMap(array, mapfn) {
-        var result;
-        if (array) {
-            result = [];
-            for (var i = 0; i < array.length; i++) {
-                var v = mapfn(array[i], i);
-                if (v) {
-                    if (isArray(v)) {
-                        addRange(result, v);
-                    }
-                    else {
-                        result.push(v);
-                    }
-                }
-            }
-        }
-        return result;
-    }
-    ts.flatMap = flatMap;
-    function flatMapIterator(iter, mapfn) {
-        var first = iter.next();
-        if (first.done) {
-            return ts.emptyIterator;
-        }
-        var currentIter = getIterator(first.value);
-        return {
-            next: function () {
-                while (true) {
-                    var currentRes = currentIter.next();
-                    if (!currentRes.done) {
-                        return currentRes;
-                    }
-                    var iterRes = iter.next();
-                    if (iterRes.done) {
-                        return iterRes;
-                    }
-                    currentIter = getIterator(iterRes.value);
-                }
-            },
-        };
-        function getIterator(x) {
-            var res = mapfn(x);
-            return res === undefined ? ts.emptyIterator : isArray(res) ? arrayIterator(res) : res;
-        }
-    }
-    ts.flatMapIterator = flatMapIterator;
-    function sameFlatMap(array, mapfn) {
-        var result;
-        if (array) {
-            for (var i = 0; i < array.length; i++) {
-                var item = array[i];
-                var mapped = mapfn(item, i);
-                if (result || item !== mapped || isArray(mapped)) {
-                    if (!result) {
-                        result = array.slice(0, i);
-                    }
-                    if (isArray(mapped)) {
-                        addRange(result, mapped);
-                    }
-                    else {
-                        result.push(mapped);
-                    }
-                }
-            }
-        }
-        return result || array;
-    }
-    ts.sameFlatMap = sameFlatMap;
-    function mapAllOrFail(array, mapFn) {
-        var result = [];
-        for (var i = 0; i < array.length; i++) {
-            var mapped = mapFn(array[i], i);
-            if (mapped === undefined) {
-                return undefined;
-            }
-            result.push(mapped);
-        }
-        return result;
-    }
-    ts.mapAllOrFail = mapAllOrFail;
-    function mapDefined(array, mapFn) {
-        var result = [];
-        if (array) {
-            for (var i = 0; i < array.length; i++) {
-                var mapped = mapFn(array[i], i);
-                if (mapped !== undefined) {
-                    result.push(mapped);
-                }
-            }
-        }
-        return result;
-    }
-    ts.mapDefined = mapDefined;
-    function mapDefinedIterator(iter, mapFn) {
-        return {
-            next: function () {
-                while (true) {
-                    var res = iter.next();
-                    if (res.done) {
-                        return res;
-                    }
-                    var value = mapFn(res.value);
-                    if (value !== undefined) {
-                        return { value: value, done: false };
-                    }
-                }
-            }
-        };
-    }
-    ts.mapDefinedIterator = mapDefinedIterator;
-    ts.emptyIterator = { next: function () { return ({ value: undefined, done: true }); } };
-    function singleIterator(value) {
-        var done = false;
-        return {
-            next: function () {
-                var wasDone = done;
-                done = true;
-                return wasDone ? { value: undefined, done: true } : { value: value, done: false };
-            }
-        };
-    }
-    ts.singleIterator = singleIterator;
-    function spanMap(array, keyfn, mapfn) {
-        var result;
-        if (array) {
-            result = [];
-            var len = array.length;
-            var previousKey = void 0;
-            var key = void 0;
-            var start = 0;
-            var pos = 0;
-            while (start < len) {
-                while (pos < len) {
-                    var value = array[pos];
-                    key = keyfn(value, pos);
-                    if (pos === 0) {
-                        previousKey = key;
-                    }
-                    else if (key !== previousKey) {
-                        break;
-                    }
-                    pos++;
-                }
-                if (start < pos) {
-                    var v = mapfn(array.slice(start, pos), previousKey, start, pos);
-                    if (v) {
-                        result.push(v);
-                    }
-                    start = pos;
-                }
-                previousKey = key;
-                pos++;
-            }
-        }
-        return result;
-    }
-    ts.spanMap = spanMap;
-    function mapEntries(map, f) {
-        if (!map) {
-            return undefined;
-        }
-        var result = createMap();
-        map.forEach(function (value, key) {
-            var _a = f(key, value), newKey = _a[0], newValue = _a[1];
-            result.set(newKey, newValue);
-        });
-        return result;
-    }
-    ts.mapEntries = mapEntries;
-    function some(array, predicate) {
-        if (array) {
-            if (predicate) {
-                for (var _i = 0, array_3 = array; _i < array_3.length; _i++) {
-                    var v = array_3[_i];
-                    if (predicate(v)) {
-                        return true;
-                    }
-                }
-            }
-            else {
-                return array.length > 0;
-            }
-        }
-        return false;
-    }
-    ts.some = some;
-    /** Calls the callback with (start, afterEnd) index pairs for each range where 'pred' is true. */
-    function getRangesWhere(arr, pred, cb) {
-        var start;
-        for (var i = 0; i < arr.length; i++) {
-            if (pred(arr[i])) {
-                start = start === undefined ? i : start;
-            }
-            else {
-                if (start !== undefined) {
-                    cb(start, i);
-                    start = undefined;
-                }
-            }
-        }
-        if (start !== undefined)
-            cb(start, arr.length);
-    }
-    ts.getRangesWhere = getRangesWhere;
-    function concatenate(array1, array2) {
-        if (!some(array2))
-            return array1;
-        if (!some(array1))
-            return array2;
-        return array1.concat(array2);
-    }
-    ts.concatenate = concatenate;
-    function deduplicateRelational(array, equalityComparer, comparer) {
-        // Perform a stable sort of the array. This ensures the first entry in a list of
-        // duplicates remains the first entry in the result.
-        var indices = array.map(function (_, i) { return i; });
-        stableSortIndices(array, indices, comparer);
-        var last = array[indices[0]];
-        var deduplicated = [indices[0]];
-        for (var i = 1; i < indices.length; i++) {
-            var index = indices[i];
-            var item = array[index];
-            if (!equalityComparer(last, item)) {
-                deduplicated.push(index);
-                last = item;
-            }
-        }
-        // restore original order
-        deduplicated.sort();
-        return deduplicated.map(function (i) { return array[i]; });
-    }
-    function deduplicateEquality(array, equalityComparer) {
-        var result = [];
-        for (var _i = 0, array_4 = array; _i < array_4.length; _i++) {
-            var item = array_4[_i];
-            pushIfUnique(result, item, equalityComparer);
-        }
-        return result;
-    }
-    function deduplicate(array, equalityComparer, comparer) {
-        return !array ? undefined :
-            array.length === 0 ? [] :
-                array.length === 1 ? array.slice() :
-                    comparer ? deduplicateRelational(array, equalityComparer, comparer) :
-                        deduplicateEquality(array, equalityComparer);
-    }
-    ts.deduplicate = deduplicate;
-    function deduplicateSorted(array, comparer) {
-        if (!array)
-            return undefined;
-        if (array.length === 0)
-            return [];
-        var last = array[0];
-        var deduplicated = [last];
-        for (var i = 1; i < array.length; i++) {
-            var next = array[i];
-            switch (comparer(next, last)) {
-                // equality comparison
-                case true:
-                // relational comparison
-                case 0 /* EqualTo */:
-                    continue;
-                case -1 /* LessThan */:
-                    // If `array` is sorted, `next` should **never** be less than `last`.
-                    return Debug.fail("Array is unsorted.");
-            }
-            deduplicated.push(last = next);
-        }
-        return deduplicated;
-    }
-    function insertSorted(array, insert, compare) {
-        if (array.length === 0) {
-            array.push(insert);
-            return;
-        }
-        var insertIndex = binarySearch(array, insert, identity, compare);
-        if (insertIndex < 0) {
-            array.splice(~insertIndex, 0, insert);
-        }
-    }
-    ts.insertSorted = insertSorted;
-    function sortAndDeduplicate(array, comparer, equalityComparer) {
-        return deduplicateSorted(sort(array, comparer), equalityComparer || comparer);
-    }
-    ts.sortAndDeduplicate = sortAndDeduplicate;
-    function arrayIsEqualTo(array1, array2, equalityComparer) {
-        if (equalityComparer === void 0) { equalityComparer = equateValues; }
-        if (!array1 || !array2) {
-            return array1 === array2;
-        }
-        if (array1.length !== array2.length) {
-            return false;
-        }
-        for (var i = 0; i < array1.length; i++) {
-            if (!equalityComparer(array1[i], array2[i])) {
-                return false;
-            }
-        }
-        return true;
-    }
-    ts.arrayIsEqualTo = arrayIsEqualTo;
-    function changesAffectModuleResolution(oldOptions, newOptions) {
-        return !oldOptions ||
-            (oldOptions.module !== newOptions.module) ||
-            (oldOptions.moduleResolution !== newOptions.moduleResolution) ||
-            (oldOptions.noResolve !== newOptions.noResolve) ||
-            (oldOptions.target !== newOptions.target) ||
-            (oldOptions.noLib !== newOptions.noLib) ||
-            (oldOptions.jsx !== newOptions.jsx) ||
-            (oldOptions.allowJs !== newOptions.allowJs) ||
-            (oldOptions.rootDir !== newOptions.rootDir) ||
-            (oldOptions.configFilePath !== newOptions.configFilePath) ||
-            (oldOptions.baseUrl !== newOptions.baseUrl) ||
-            (oldOptions.maxNodeModuleJsDepth !== newOptions.maxNodeModuleJsDepth) ||
-            !arrayIsEqualTo(oldOptions.lib, newOptions.lib) ||
-            !arrayIsEqualTo(oldOptions.typeRoots, newOptions.typeRoots) ||
-            !arrayIsEqualTo(oldOptions.rootDirs, newOptions.rootDirs) ||
-            !equalOwnProperties(oldOptions.paths, newOptions.paths);
-    }
-    ts.changesAffectModuleResolution = changesAffectModuleResolution;
-    function compact(array) {
-        var result;
-        if (array) {
-            for (var i = 0; i < array.length; i++) {
-                var v = array[i];
-                if (result || !v) {
-                    if (!result) {
-                        result = array.slice(0, i);
-                    }
-                    if (v) {
-                        result.push(v);
-                    }
-                }
-            }
-        }
-        return result || array;
-    }
-    ts.compact = compact;
-    /**
-     * Gets the relative complement of `arrayA` with respect to `arrayB`, returning the elements that
-     * are not present in `arrayA` but are present in `arrayB`. Assumes both arrays are sorted
-     * based on the provided comparer.
-     */
-    function relativeComplement(arrayA, arrayB, comparer) {
-        if (!arrayB || !arrayA || arrayB.length === 0 || arrayA.length === 0)
-            return arrayB;
-        var result = [];
-        loopB: for (var offsetA = 0, offsetB = 0; offsetB < arrayB.length; offsetB++) {
-            if (offsetB > 0) {
-                // Ensure `arrayB` is properly sorted.
-                Debug.assertGreaterThanOrEqual(comparer(arrayB[offsetB], arrayB[offsetB - 1]), 0 /* EqualTo */);
-            }
-            loopA: for (var startA = offsetA; offsetA < arrayA.length; offsetA++) {
-                if (offsetA > startA) {
-                    // Ensure `arrayA` is properly sorted. We only need to perform this check if
-                    // `offsetA` has changed since we entered the loop.
-                    Debug.assertGreaterThanOrEqual(comparer(arrayA[offsetA], arrayA[offsetA - 1]), 0 /* EqualTo */);
-                }
-                switch (comparer(arrayB[offsetB], arrayA[offsetA])) {
-                    case -1 /* LessThan */:
-                        // If B is less than A, B does not exist in arrayA. Add B to the result and
-                        // move to the next element in arrayB without changing the current position
-                        // in arrayA.
-                        result.push(arrayB[offsetB]);
-                        continue loopB;
-                    case 0 /* EqualTo */:
-                        // If B is equal to A, B exists in arrayA. Move to the next element in
-                        // arrayB without adding B to the result or changing the current position
-                        // in arrayA.
-                        continue loopB;
-                    case 1 /* GreaterThan */:
-                        // If B is greater than A, we need to keep looking for B in arrayA. Move to
-                        // the next element in arrayA and recheck.
-                        continue loopA;
-                }
-            }
-        }
-        return result;
-    }
-    ts.relativeComplement = relativeComplement;
-    function sum(array, prop) {
-        var result = 0;
-        for (var _i = 0, array_5 = array; _i < array_5.length; _i++) {
-            var v = array_5[_i];
-            result += v[prop];
-        }
-        return result;
-    }
-    ts.sum = sum;
-    function append(to, value) {
-        if (value === undefined)
-            return to;
-        if (to === undefined)
-            return [value];
-        to.push(value);
-        return to;
-    }
-    ts.append = append;
-    /**
-     * Gets the actual offset into an array for a relative offset. Negative offsets indicate a
-     * position offset from the end of the array.
-     */
-    function toOffset(array, offset) {
-        return offset < 0 ? array.length + offset : offset;
-    }
-    function addRange(to, from, start, end) {
-        if (from === undefined || from.length === 0)
-            return to;
-        if (to === undefined)
-            return from.slice(start, end);
-        start = start === undefined ? 0 : toOffset(from, start);
-        end = end === undefined ? from.length : toOffset(from, end);
-        for (var i = start; i < end && i < from.length; i++) {
-            if (from[i] !== undefined) {
-                to.push(from[i]);
-            }
-        }
-        return to;
-    }
-    ts.addRange = addRange;
-    /**
-     * @return Whether the value was added.
-     */
-    function pushIfUnique(array, toAdd, equalityComparer) {
-        if (contains(array, toAdd, equalityComparer)) {
-            return false;
-        }
-        else {
-            array.push(toAdd);
-            return true;
-        }
-    }
-    ts.pushIfUnique = pushIfUnique;
-    /**
-     * Unlike `pushIfUnique`, this can take `undefined` as an input, and returns a new array.
-     */
-    function appendIfUnique(array, toAdd, equalityComparer) {
-        if (array) {
-            pushIfUnique(array, toAdd, equalityComparer);
-            return array;
-        }
-        else {
-            return [toAdd];
-        }
-    }
-    ts.appendIfUnique = appendIfUnique;
-    function stableSortIndices(array, indices, comparer) {
-        // sort indices by value then position
-        indices.sort(function (x, y) { return comparer(array[x], array[y]) || compareValues(x, y); });
-    }
-    /**
-     * Returns a new sorted array.
-     */
-    function sort(array, comparer) {
-        return array.slice().sort(comparer);
-    }
-    ts.sort = sort;
-    function best(iter, isBetter) {
-        var x = iter.next();
-        if (x.done) {
-            return undefined;
-        }
-        var best = x.value;
-        while (true) {
-            var _a = iter.next(), value = _a.value, done = _a.done;
-            if (done) {
-                return best;
-            }
-            if (isBetter(value, best)) {
-                best = value;
-            }
-        }
-    }
-    ts.best = best;
-    function arrayIterator(array) {
-        var i = 0;
-        return { next: function () {
-                if (i === array.length) {
-                    return { value: undefined, done: true };
-                }
-                else {
-                    i++;
-                    return { value: array[i - 1], done: false };
-                }
-            } };
-    }
-    ts.arrayIterator = arrayIterator;
-    /**
-     * Stable sort of an array. Elements equal to each other maintain their relative position in the array.
-     */
-    function stableSort(array, comparer) {
-        var indices = array.map(function (_, i) { return i; });
-        stableSortIndices(array, indices, comparer);
-        return indices.map(function (i) { return array[i]; });
-    }
-    ts.stableSort = stableSort;
-    function rangeEquals(array1, array2, pos, end) {
-        while (pos < end) {
-            if (array1[pos] !== array2[pos]) {
-                return false;
-            }
-            pos++;
-        }
-        return true;
-    }
-    ts.rangeEquals = rangeEquals;
-    /**
-     * Returns the element at a specific offset in an array if non-empty, `undefined` otherwise.
-     * A negative offset indicates the element should be retrieved from the end of the array.
-     */
-    function elementAt(array, offset) {
-        if (array) {
-            offset = toOffset(array, offset);
-            if (offset < array.length) {
-                return array[offset];
-            }
-        }
-        return undefined;
-    }
-    ts.elementAt = elementAt;
-    /**
-     * Returns the first element of an array if non-empty, `undefined` otherwise.
-     */
-    function firstOrUndefined(array) {
-        return array.length === 0 ? undefined : array[0];
-    }
-    ts.firstOrUndefined = firstOrUndefined;
-    function first(array) {
-        Debug.assert(array.length !== 0);
-        return array[0];
-    }
-    ts.first = first;
-    /**
-     * Returns the last element of an array if non-empty, `undefined` otherwise.
-     */
-    function lastOrUndefined(array) {
-        return array.length === 0 ? undefined : array[array.length - 1];
-    }
-    ts.lastOrUndefined = lastOrUndefined;
-    function last(array) {
-        Debug.assert(array.length !== 0);
-        return array[array.length - 1];
-    }
-    ts.last = last;
-    /**
-     * Returns the only element of an array if it contains only one element, `undefined` otherwise.
-     */
-    function singleOrUndefined(array) {
-        return array && array.length === 1
-            ? array[0]
-            : undefined;
-    }
-    ts.singleOrUndefined = singleOrUndefined;
-    function singleOrMany(array) {
-        return array && array.length === 1
-            ? array[0]
-            : array;
-    }
-    ts.singleOrMany = singleOrMany;
-    function replaceElement(array, index, value) {
-        var result = array.slice(0);
-        result[index] = value;
-        return result;
-    }
-    ts.replaceElement = replaceElement;
-    /**
-     * Performs a binary search, finding the index at which `value` occurs in `array`.
-     * If no such index is found, returns the 2's-complement of first index at which
-     * `array[index]` exceeds `value`.
-     * @param array A sorted array whose first element must be no larger than number
-     * @param value The value to be searched for in the array.
-     * @param keySelector A callback used to select the search key from `value` and each element of
-     * `array`.
-     * @param keyComparer A callback used to compare two keys in a sorted array.
-     * @param offset An offset into `array` at which to start the search.
-     */
-    function binarySearch(array, value, keySelector, keyComparer, offset) {
-        if (!array || array.length === 0) {
-            return -1;
-        }
-        var low = offset || 0;
-        var high = array.length - 1;
-        var key = keySelector(value);
-        while (low <= high) {
-            var middle = low + ((high - low) >> 1);
-            var midKey = keySelector(array[middle]);
-            switch (keyComparer(midKey, key)) {
-                case -1 /* LessThan */:
-                    low = middle + 1;
-                    break;
-                case 0 /* EqualTo */:
-                    return middle;
-                case 1 /* GreaterThan */:
-                    high = middle - 1;
-                    break;
-            }
-        }
-        return ~low;
-    }
-    ts.binarySearch = binarySearch;
-    function reduceLeft(array, f, initial, start, count) {
-        if (array && array.length > 0) {
-            var size = array.length;
-            if (size > 0) {
-                var pos = start === undefined || start < 0 ? 0 : start;
-                var end = count === undefined || pos + count > size - 1 ? size - 1 : pos + count;
-                var result = void 0;
-                if (arguments.length <= 2) {
-                    result = array[pos];
-                    pos++;
-                }
-                else {
-                    result = initial;
-                }
-                while (pos <= end) {
-                    result = f(result, array[pos], pos);
-                    pos++;
-                }
-                return result;
-            }
-        }
-        return initial;
-    }
-    ts.reduceLeft = reduceLeft;
-    var hasOwnProperty = Object.prototype.hasOwnProperty;
-    /**
-     * Indicates whether a map-like contains an own property with the specified key.
-     *
-     * @param map A map-like.
-     * @param key A property key.
-     */
-    function hasProperty(map, key) {
-        return hasOwnProperty.call(map, key);
-    }
-    ts.hasProperty = hasProperty;
-    /**
-     * Gets the value of an owned property in a map-like.
-     *
-     * @param map A map-like.
-     * @param key A property key.
-     */
-    function getProperty(map, key) {
-        return hasOwnProperty.call(map, key) ? map[key] : undefined;
-    }
-    ts.getProperty = getProperty;
-    /**
-     * Gets the owned, enumerable property keys of a map-like.
-     */
-    function getOwnKeys(map) {
-        var keys = [];
-        for (var key in map) {
-            if (hasOwnProperty.call(map, key)) {
-                keys.push(key);
-            }
-        }
-        return keys;
-    }
-    ts.getOwnKeys = getOwnKeys;
-    function getOwnValues(sparseArray) {
-        var values = [];
-        for (var key in sparseArray) {
-            if (hasOwnProperty.call(sparseArray, key)) {
-                values.push(sparseArray[key]);
-            }
-        }
-        return values;
-    }
-    ts.getOwnValues = getOwnValues;
-    function arrayFrom(iterator, map) {
-        var _a;
-        var result = [];
-        for (var _b = iterator.next(), value = _b.value, done = _b.done; !done; _a = iterator.next(), value = _a.value, done = _a.done, _a) {
-            result.push(map ? map(value) : value);
-        }
-        return result;
-    }
-    ts.arrayFrom = arrayFrom;
-    function forEachEntry(map, callback) {
-        var _a;
-        var iterator = map.entries();
-        for (var _b = iterator.next(), pair = _b.value, done = _b.done; !done; _a = iterator.next(), pair = _a.value, done = _a.done, _a) {
-            var key = pair[0], value = pair[1];
-            var result = callback(value, key);
-            if (result) {
-                return result;
-            }
-        }
-        return undefined;
-    }
-    ts.forEachEntry = forEachEntry;
-    function forEachKey(map, callback) {
-        var _a;
-        var iterator = map.keys();
-        for (var _b = iterator.next(), key = _b.value, done = _b.done; !done; _a = iterator.next(), key = _a.value, done = _a.done, _a) {
-            var result = callback(key);
-            if (result) {
-                return result;
-            }
-        }
-        return undefined;
-    }
-    ts.forEachKey = forEachKey;
-    function copyEntries(source, target) {
-        source.forEach(function (value, key) {
-            target.set(key, value);
-        });
-    }
-    ts.copyEntries = copyEntries;
-    function assign(t) {
-        var args = [];
-        for (var _i = 1; _i < arguments.length; _i++) {
-            args[_i - 1] = arguments[_i];
-        }
-        for (var _a = 0, args_1 = args; _a < args_1.length; _a++) {
-            var arg = args_1[_a];
-            for (var p in arg) {
-                if (hasProperty(arg, p)) {
-                    t[p] = arg[p]; // TODO: GH#23368
-                }
-            }
-        }
-        return t;
-    }
-    ts.assign = assign;
-    /**
-     * Performs a shallow equality comparison of the contents of two map-likes.
-     *
-     * @param left A map-like whose properties should be compared.
-     * @param right A map-like whose properties should be compared.
-     */
-    function equalOwnProperties(left, right, equalityComparer) {
-        if (equalityComparer === void 0) { equalityComparer = equateValues; }
-        if (left === right)
-            return true;
-        if (!left || !right)
-            return false;
-        for (var key in left) {
-            if (hasOwnProperty.call(left, key)) {
-                if (!hasOwnProperty.call(right, key) === undefined)
-                    return false;
-                if (!equalityComparer(left[key], right[key]))
-                    return false;
-            }
-        }
-        for (var key in right) {
-            if (hasOwnProperty.call(right, key)) {
-                if (!hasOwnProperty.call(left, key))
-                    return false;
-            }
-        }
-        return true;
-    }
-    ts.equalOwnProperties = equalOwnProperties;
-    function arrayToMap(array, makeKey, makeValue) {
-        if (makeValue === void 0) { makeValue = identity; }
-        var result = createMap();
-        for (var _i = 0, array_6 = array; _i < array_6.length; _i++) {
-            var value = array_6[_i];
-            var key = makeKey(value);
-            if (key !== undefined)
-                result.set(key, makeValue(value));
-        }
-        return result;
-    }
-    ts.arrayToMap = arrayToMap;
-    function arrayToNumericMap(array, makeKey, makeValue) {
-        if (makeValue === void 0) { makeValue = identity; }
-        var result = [];
-        for (var _i = 0, array_7 = array; _i < array_7.length; _i++) {
-            var value = array_7[_i];
-            result[makeKey(value)] = makeValue(value);
-        }
-        return result;
-    }
-    ts.arrayToNumericMap = arrayToNumericMap;
-    function arrayToSet(array, makeKey) {
-        return arrayToMap(array, makeKey || (function (s) { return s; }), function () { return true; });
-    }
-    ts.arrayToSet = arrayToSet;
-    function arrayToMultiMap(values, makeKey, makeValue) {
-        if (makeValue === void 0) { makeValue = identity; }
-        var result = createMultiMap();
-        for (var _i = 0, values_1 = values; _i < values_1.length; _i++) {
-            var value = values_1[_i];
-            result.add(makeKey(value), makeValue(value));
-        }
-        return result;
-    }
-    ts.arrayToMultiMap = arrayToMultiMap;
-    function group(values, getGroupId) {
-        return arrayFrom(arrayToMultiMap(values, getGroupId).values());
-    }
-    ts.group = group;
-    function cloneMap(map) {
-        var clone = createMap();
-        copyEntries(map, clone);
-        return clone;
-    }
-    ts.cloneMap = cloneMap;
-    function clone(object) {
-        var result = {};
-        for (var id in object) {
-            if (hasOwnProperty.call(object, id)) {
-                result[id] = object[id];
-            }
-        }
-        return result;
-    }
-    ts.clone = clone;
-    function extend(first, second) {
-        var result = {};
-        for (var id in second) {
-            if (hasOwnProperty.call(second, id)) {
-                result[id] = second[id];
-            }
-        }
-        for (var id in first) {
-            if (hasOwnProperty.call(first, id)) {
-                result[id] = first[id];
-            }
-        }
-        return result;
-    }
-    ts.extend = extend;
-    function createMultiMap() {
-        var map = createMap();
-        map.add = multiMapAdd;
-        map.remove = multiMapRemove;
-        return map;
-    }
-    ts.createMultiMap = createMultiMap;
-    function multiMapAdd(key, value) {
-        var values = this.get(key);
-        if (values) {
-            values.push(value);
-        }
-        else {
-            this.set(key, values = [value]);
-        }
-        return values;
-    }
-    function multiMapRemove(key, value) {
-        var values = this.get(key);
-        if (values) {
-            unorderedRemoveItem(values, value);
-            if (!values.length) {
-                this.delete(key);
-            }
-        }
-    }
-    /**
-     * Tests whether a value is an array.
-     */
-    function isArray(value) {
-        return Array.isArray ? Array.isArray(value) : value instanceof Array;
-    }
-    ts.isArray = isArray;
-    function toArray(value) {
-        return isArray(value) ? value : [value];
-    }
-    ts.toArray = toArray;
-    /**
-     * Tests whether a value is string
-     */
-    function isString(text) {
-        return typeof text === "string";
-    }
-    ts.isString = isString;
-    function tryCast(value, test) {
-        return value !== undefined && test(value) ? value : undefined;
-    }
-    ts.tryCast = tryCast;
-    function cast(value, test) {
-        if (value !== undefined && test(value))
-            return value;
-        if (value && typeof value.kind === "number") {
-            return Debug.fail("Invalid cast. The supplied " + Debug.showSyntaxKind(value) + " did not pass the test '" + Debug.getFunctionName(test) + "'.");
-        }
-        else {
-            return Debug.fail("Invalid cast. The supplied value did not pass the test '" + Debug.getFunctionName(test) + "'.");
-        }
-    }
-    ts.cast = cast;
-    /** Does nothing. */
-    function noop(_) { } // tslint:disable-line no-empty
-    ts.noop = noop;
-    /** Do nothing and return false */
-    function returnFalse() { return false; }
-    ts.returnFalse = returnFalse;
-    /** Do nothing and return true */
-    function returnTrue() { return true; }
-    ts.returnTrue = returnTrue;
-    /** Returns its argument. */
-    function identity(x) { return x; }
-    ts.identity = identity;
-    /** Returns lower case string */
-    function toLowerCase(x) { return x.toLowerCase(); }
-    ts.toLowerCase = toLowerCase;
-    /** Throws an error because a function is not implemented. */
-    function notImplemented() {
-        throw new Error("Not implemented");
-    }
-    ts.notImplemented = notImplemented;
-    function memoize(callback) {
-        var value;
-        return function () {
-            if (callback) {
-                value = callback();
-                callback = undefined;
-            }
-            return value;
-        };
-    }
-    ts.memoize = memoize;
-    function chain(a, b, c, d, e) {
-        if (e) {
-            var args_2 = [];
-            for (var i = 0; i < arguments.length; i++) {
-                args_2[i] = arguments[i];
-            }
-            return function (t) { return compose.apply(void 0, map(args_2, function (f) { return f(t); })); };
-        }
-        else if (d) {
-            return function (t) { return compose(a(t), b(t), c(t), d(t)); };
-        }
-        else if (c) {
-            return function (t) { return compose(a(t), b(t), c(t)); };
-        }
-        else if (b) {
-            return function (t) { return compose(a(t), b(t)); };
-        }
-        else if (a) {
-            return function (t) { return compose(a(t)); };
-        }
-        else {
-            return function (_) { return function (u) { return u; }; };
-        }
-    }
-    ts.chain = chain;
-    function compose(a, b, c, d, e) {
-        if (e) {
-            var args_3 = [];
-            for (var i = 0; i < arguments.length; i++) {
-                args_3[i] = arguments[i];
-            }
-            return function (t) { return reduceLeft(args_3, function (u, f) { return f(u); }, t); };
-        }
-        else if (d) {
-            return function (t) { return d(c(b(a(t)))); };
-        }
-        else if (c) {
-            return function (t) { return c(b(a(t))); };
-        }
-        else if (b) {
-            return function (t) { return b(a(t)); };
-        }
-        else if (a) {
-            return function (t) { return a(t); };
-        }
-        else {
-            return function (t) { return t; };
-        }
-    }
-    ts.compose = compose;
-    function formatStringFromArgs(text, args, baseIndex) {
-        if (baseIndex === void 0) { baseIndex = 0; }
-        return text.replace(/{(\d+)}/g, function (_match, index) { return Debug.assertDefined(args[+index + baseIndex]); });
-    }
-    ts.formatStringFromArgs = formatStringFromArgs;
-    function getLocaleSpecificMessage(message) {
-        return ts.localizedDiagnosticMessages && ts.localizedDiagnosticMessages[message.key] || message.message;
-    }
-    ts.getLocaleSpecificMessage = getLocaleSpecificMessage;
-    function createFileDiagnostic(file, start, length, message) {
-        Debug.assertGreaterThanOrEqual(start, 0);
-        Debug.assertGreaterThanOrEqual(length, 0);
-        if (file) {
-            Debug.assertLessThanOrEqual(start, file.text.length);
-            Debug.assertLessThanOrEqual(start + length, file.text.length);
-        }
-        var text = getLocaleSpecificMessage(message);
-        if (arguments.length > 4) {
-            text = formatStringFromArgs(text, arguments, 4);
-        }
-        return {
-            file: file,
-            start: start,
-            length: length,
-            messageText: text,
-            category: message.category,
-            code: message.code,
-            reportsUnnecessary: message.reportsUnnecessary,
-        };
-    }
-    ts.createFileDiagnostic = createFileDiagnostic;
-    /* internal */
-    function formatMessage(_dummy, message) {
-        var text = getLocaleSpecificMessage(message);
-        if (arguments.length > 2) {
-            text = formatStringFromArgs(text, arguments, 2);
-        }
-        return text;
-    }
-    ts.formatMessage = formatMessage;
-    function createCompilerDiagnostic(message) {
-        var text = getLocaleSpecificMessage(message);
-        if (arguments.length > 1) {
-            text = formatStringFromArgs(text, arguments, 1);
-        }
-        return {
-            file: undefined,
-            start: undefined,
-            length: undefined,
-            messageText: text,
-            category: message.category,
-            code: message.code,
-            reportsUnnecessary: message.reportsUnnecessary,
-        };
-    }
-    ts.createCompilerDiagnostic = createCompilerDiagnostic;
-    function createCompilerDiagnosticFromMessageChain(chain) {
-        return {
-            file: undefined,
-            start: undefined,
-            length: undefined,
-            code: chain.code,
-            category: chain.category,
-            messageText: chain.next ? chain : chain.messageText,
-        };
-    }
-    ts.createCompilerDiagnosticFromMessageChain = createCompilerDiagnosticFromMessageChain;
-    function chainDiagnosticMessages(details, message) {
-        var text = getLocaleSpecificMessage(message);
-        if (arguments.length > 2) {
-            text = formatStringFromArgs(text, arguments, 2);
-        }
-        return {
-            messageText: text,
-            category: message.category,
-            code: message.code,
-            next: details
-        };
-    }
-    ts.chainDiagnosticMessages = chainDiagnosticMessages;
-    function concatenateDiagnosticMessageChains(headChain, tailChain) {
-        var lastChain = headChain;
-        while (lastChain.next) {
-            lastChain = lastChain.next;
-        }
-        lastChain.next = tailChain;
-        return headChain;
-    }
-    ts.concatenateDiagnosticMessageChains = concatenateDiagnosticMessageChains;
-    function equateValues(a, b) {
-        return a === b;
-    }
-    ts.equateValues = equateValues;
-    /**
-     * Compare the equality of two strings using a case-sensitive ordinal comparison.
-     *
-     * Case-sensitive comparisons compare both strings one code-point at a time using the integer
-     * value of each code-point after applying `toUpperCase` to each string. We always map both
-     * strings to their upper-case form as some unicode characters do not properly round-trip to
-     * lowercase (such as `ẞ` (German sharp capital s)).
-     */
-    function equateStringsCaseInsensitive(a, b) {
-        return a === b
-            || a !== undefined
-                && b !== undefined
-                && a.toUpperCase() === b.toUpperCase();
-    }
-    ts.equateStringsCaseInsensitive = equateStringsCaseInsensitive;
-    /**
-     * Compare the equality of two strings using a case-sensitive ordinal comparison.
-     *
-     * Case-sensitive comparisons compare both strings one code-point at a time using the
-     * integer value of each code-point.
-     */
-    function equateStringsCaseSensitive(a, b) {
-        return equateValues(a, b);
-    }
-    ts.equateStringsCaseSensitive = equateStringsCaseSensitive;
-    function compareComparableValues(a, b) {
-        return a === b ? 0 /* EqualTo */ :
-            a === undefined ? -1 /* LessThan */ :
-                b === undefined ? 1 /* GreaterThan */ :
-                    a < b ? -1 /* LessThan */ :
-                        1 /* GreaterThan */;
-    }
-    /**
-     * Compare two numeric values for their order relative to each other.
-     * To compare strings, use any of the `compareStrings` functions.
-     */
-    function compareValues(a, b) {
-        return compareComparableValues(a, b);
-    }
-    ts.compareValues = compareValues;
-    function min(a, b, compare) {
-        return compare(a, b) === -1 /* LessThan */ ? a : b;
-    }
-    ts.min = min;
-    /**
-     * Compare two strings using a case-insensitive ordinal comparison.
-     *
-     * Ordinal comparisons are based on the difference between the unicode code points of both
-     * strings. Characters with multiple unicode representations are considered unequal. Ordinal
-     * comparisons provide predictable ordering, but place "a" after "B".
-     *
-     * Case-insensitive comparisons compare both strings one code-point at a time using the integer
-     * value of each code-point after applying `toUpperCase` to each string. We always map both
-     * strings to their upper-case form as some unicode characters do not properly round-trip to
-     * lowercase (such as `ẞ` (German sharp capital s)).
-     */
-    function compareStringsCaseInsensitive(a, b) {
-        if (a === b)
-            return 0 /* EqualTo */;
-        if (a === undefined)
-            return -1 /* LessThan */;
-        if (b === undefined)
-            return 1 /* GreaterThan */;
-        a = a.toUpperCase();
-        b = b.toUpperCase();
-        return a < b ? -1 /* LessThan */ : a > b ? 1 /* GreaterThan */ : 0 /* EqualTo */;
-    }
-    ts.compareStringsCaseInsensitive = compareStringsCaseInsensitive;
-    /**
-     * Compare two strings using a case-sensitive ordinal comparison.
-     *
-     * Ordinal comparisons are based on the difference between the unicode code points of both
-     * strings. Characters with multiple unicode representations are considered unequal. Ordinal
-     * comparisons provide predictable ordering, but place "a" after "B".
-     *
-     * Case-sensitive comparisons compare both strings one code-point at a time using the integer
-     * value of each code-point.
-     */
-    function compareStringsCaseSensitive(a, b) {
-        return compareComparableValues(a, b);
-    }
-    ts.compareStringsCaseSensitive = compareStringsCaseSensitive;
-    function getStringComparer(ignoreCase) {
-        return ignoreCase ? compareStringsCaseInsensitive : compareStringsCaseSensitive;
-    }
-    ts.getStringComparer = getStringComparer;
-    /**
-     * Creates a string comparer for use with string collation in the UI.
-     */
-    var createUIStringComparer = (function () {
-        var defaultComparer;
-        var enUSComparer;
-        var stringComparerFactory = getStringComparerFactory();
-        return createStringComparer;
-        function compareWithCallback(a, b, comparer) {
-            if (a === b)
-                return 0 /* EqualTo */;
-            if (a === undefined)
-                return -1 /* LessThan */;
-            if (b === undefined)
-                return 1 /* GreaterThan */;
-            var value = comparer(a, b);
-            return value < 0 ? -1 /* LessThan */ : value > 0 ? 1 /* GreaterThan */ : 0 /* EqualTo */;
-        }
-        function createIntlCollatorStringComparer(locale) {
-            // Intl.Collator.prototype.compare is bound to the collator. See NOTE in
-            // http://www.ecma-international.org/ecma-402/2.0/#sec-Intl.Collator.prototype.compare
-            var comparer = new Intl.Collator(locale, { usage: "sort", sensitivity: "variant" }).compare;
-            return function (a, b) { return compareWithCallback(a, b, comparer); };
-        }
-        function createLocaleCompareStringComparer(locale) {
-            // if the locale is not the default locale (`undefined`), use the fallback comparer.
-            if (locale !== undefined)
-                return createFallbackStringComparer();
-            return function (a, b) { return compareWithCallback(a, b, compareStrings); };
-            function compareStrings(a, b) {
-                return a.localeCompare(b);
-            }
-        }
-        function createFallbackStringComparer() {
-            // An ordinal comparison puts "A" after "b", but for the UI we want "A" before "b".
-            // We first sort case insensitively.  So "Aaa" will come before "baa".
-            // Then we sort case sensitively, so "aaa" will come before "Aaa".
-            //
-            // For case insensitive comparisons we always map both strings to their
-            // upper-case form as some unicode characters do not properly round-trip to
-            // lowercase (such as `ẞ` (German sharp capital s)).
-            return function (a, b) { return compareWithCallback(a, b, compareDictionaryOrder); };
-            function compareDictionaryOrder(a, b) {
-                return compareStrings(a.toUpperCase(), b.toUpperCase()) || compareStrings(a, b);
-            }
-            function compareStrings(a, b) {
-                return a < b ? -1 /* LessThan */ : a > b ? 1 /* GreaterThan */ : 0 /* EqualTo */;
-            }
-        }
-        function getStringComparerFactory() {
-            // If the host supports Intl, we use it for comparisons using the default locale.
-            if (typeof Intl === "object" && typeof Intl.Collator === "function") {
-                return createIntlCollatorStringComparer;
-            }
-            // If the host does not support Intl, we fall back to localeCompare.
-            // localeCompare in Node v0.10 is just an ordinal comparison, so don't use it.
-            if (typeof String.prototype.localeCompare === "function" &&
-                typeof String.prototype.toLocaleUpperCase === "function" &&
-                "a".localeCompare("B") < 0) {
-                return createLocaleCompareStringComparer;
-            }
-            // Otherwise, fall back to ordinal comparison:
-            return createFallbackStringComparer;
-        }
-        function createStringComparer(locale) {
-            // Hold onto common string comparers. This avoids constantly reallocating comparers during
-            // tests.
-            if (locale === undefined) {
-                return defaultComparer || (defaultComparer = stringComparerFactory(locale));
-            }
-            else if (locale === "en-US") {
-                return enUSComparer || (enUSComparer = stringComparerFactory(locale));
-            }
-            else {
-                return stringComparerFactory(locale);
-            }
-        }
-    })();
-    var uiComparerCaseSensitive;
-    var uiLocale;
-    function getUILocale() {
-        return uiLocale;
-    }
-    ts.getUILocale = getUILocale;
-    function setUILocale(value) {
-        if (uiLocale !== value) {
-            uiLocale = value;
-            uiComparerCaseSensitive = undefined;
-        }
-    }
-    ts.setUILocale = setUILocale;
-    /**
-     * Compare two strings in a using the case-sensitive sort behavior of the UI locale.
-     *
-     * Ordering is not predictable between different host locales, but is best for displaying
-     * ordered data for UI presentation. Characters with multiple unicode representations may
-     * be considered equal.
-     *
-     * Case-sensitive comparisons compare strings that differ in base characters, or
-     * accents/diacritic marks, or case as unequal.
-     */
-    function compareStringsCaseSensitiveUI(a, b) {
-        var comparer = uiComparerCaseSensitive || (uiComparerCaseSensitive = createUIStringComparer(uiLocale));
-        return comparer(a, b);
-    }
-    ts.compareStringsCaseSensitiveUI = compareStringsCaseSensitiveUI;
-    function compareProperties(a, b, key, comparer) {
-        return a === b ? 0 /* EqualTo */ :
-            a === undefined ? -1 /* LessThan */ :
-                b === undefined ? 1 /* GreaterThan */ :
-                    comparer(a[key], b[key]);
-    }
-    ts.compareProperties = compareProperties;
-    function getDiagnosticFilePath(diagnostic) {
-        return diagnostic.file ? diagnostic.file.path : undefined;
-    }
-    function compareDiagnostics(d1, d2) {
-        return compareStringsCaseSensitive(getDiagnosticFilePath(d1), getDiagnosticFilePath(d2)) ||
-            compareValues(d1.start, d2.start) ||
-            compareValues(d1.length, d2.length) ||
-            compareValues(d1.code, d2.code) ||
-            compareMessageText(d1.messageText, d2.messageText) ||
-            0 /* EqualTo */;
-    }
-    ts.compareDiagnostics = compareDiagnostics;
-    /** True is greater than false. */
-    function compareBooleans(a, b) {
-        return compareValues(a ? 1 : 0, b ? 1 : 0);
-    }
-    ts.compareBooleans = compareBooleans;
-    function compareMessageText(t1, t2) {
-        var text1 = t1;
-        var text2 = t2;
-        while (text1 && text2) {
-            // We still have both chains.
-            var string1 = isString(text1) ? text1 : text1.messageText;
-            var string2 = isString(text2) ? text2 : text2.messageText;
-            var res = compareStringsCaseSensitive(string1, string2);
-            if (res) {
-                return res;
-            }
-            text1 = isString(text1) ? undefined : text1.next;
-            text2 = isString(text2) ? undefined : text2.next;
-        }
-        if (!text1 && !text2) {
-            // if the chains are done, then these messages are the same.
-            return 0 /* EqualTo */;
-        }
-        // We still have one chain remaining.  The shorter chain should come first.
-        return text1 ? 1 /* GreaterThan */ : -1 /* LessThan */;
-    }
-    function getEmitScriptTarget(compilerOptions) {
-        return compilerOptions.target || 0 /* ES3 */;
-    }
-    ts.getEmitScriptTarget = getEmitScriptTarget;
-    function getEmitModuleKind(compilerOptions) {
-        return typeof compilerOptions.module === "number" ?
-            compilerOptions.module :
-            getEmitScriptTarget(compilerOptions) >= 2 /* ES2015 */ ? ts.ModuleKind.ES2015 : ts.ModuleKind.CommonJS;
-    }
-    ts.getEmitModuleKind = getEmitModuleKind;
-    function getEmitModuleResolutionKind(compilerOptions) {
-        var moduleResolution = compilerOptions.moduleResolution;
-        if (moduleResolution === undefined) {
-            moduleResolution = getEmitModuleKind(compilerOptions) === ts.ModuleKind.CommonJS ? ts.ModuleResolutionKind.NodeJs : ts.ModuleResolutionKind.Classic;
-        }
-        return moduleResolution;
-    }
-    ts.getEmitModuleResolutionKind = getEmitModuleResolutionKind;
-    function unreachableCodeIsError(options) {
-        return options.allowUnreachableCode === false;
-    }
-    ts.unreachableCodeIsError = unreachableCodeIsError;
-    function unusedLabelIsError(options) {
-        return options.allowUnusedLabels === false;
-    }
-    ts.unusedLabelIsError = unusedLabelIsError;
-    function getAreDeclarationMapsEnabled(options) {
-        return !!(options.declaration && options.declarationMap);
-    }
-    ts.getAreDeclarationMapsEnabled = getAreDeclarationMapsEnabled;
-    function getAllowSyntheticDefaultImports(compilerOptions) {
-        var moduleKind = getEmitModuleKind(compilerOptions);
-        return compilerOptions.allowSyntheticDefaultImports !== undefined
-            ? compilerOptions.allowSyntheticDefaultImports
-            : compilerOptions.esModuleInterop
-                ? moduleKind !== ts.ModuleKind.None && moduleKind < ts.ModuleKind.ES2015
-                : moduleKind === ts.ModuleKind.System;
-    }
-    ts.getAllowSyntheticDefaultImports = getAllowSyntheticDefaultImports;
-    function getEmitDeclarations(compilerOptions) {
-        return !!(compilerOptions.declaration || compilerOptions.composite);
-    }
-    ts.getEmitDeclarations = getEmitDeclarations;
-    function getStrictOptionValue(compilerOptions, flag) {
-        return compilerOptions[flag] === undefined ? !!compilerOptions.strict : !!compilerOptions[flag];
-    }
-    ts.getStrictOptionValue = getStrictOptionValue;
-    function hasZeroOrOneAsteriskCharacter(str) {
-        var seenAsterisk = false;
-        for (var i = 0; i < str.length; i++) {
-            if (str.charCodeAt(i) === 42 /* asterisk */) {
-                if (!seenAsterisk) {
-                    seenAsterisk = true;
-                }
-                else {
-                    // have already seen asterisk
-                    return false;
-                }
-            }
-        }
-        return true;
-    }
-    ts.hasZeroOrOneAsteriskCharacter = hasZeroOrOneAsteriskCharacter;
-    //
-    // Paths
-    //
-    /**
-     * Internally, we represent paths as strings with '/' as the directory separator.
-     * When we make system calls (eg: LanguageServiceHost.getDirectory()),
-     * we expect the host to correctly handle paths in our specified format.
-     */
-    ts.directorySeparator = "/";
-    var altDirectorySeparator = "\\";
-    var urlSchemeSeparator = "://";
-    var backslashRegExp = /\\/g;
-    /**
-     * Normalize path separators.
-     */
-    function normalizeSlashes(path) {
-        return path.replace(backslashRegExp, ts.directorySeparator);
-    }
-    ts.normalizeSlashes = normalizeSlashes;
-    function isVolumeCharacter(charCode) {
-        return (charCode >= 97 /* a */ && charCode <= 122 /* z */) ||
-            (charCode >= 65 /* A */ && charCode <= 90 /* Z */);
-    }
-    function getFileUrlVolumeSeparatorEnd(url, start) {
-        var ch0 = url.charCodeAt(start);
-        if (ch0 === 58 /* colon */)
-            return start + 1;
-        if (ch0 === 37 /* percent */ && url.charCodeAt(start + 1) === 51 /* _3 */) {
-            var ch2 = url.charCodeAt(start + 2);
-            if (ch2 === 97 /* a */ || ch2 === 65 /* A */)
-                return start + 3;
-        }
-        return -1;
-    }
-    /**
-     * Returns length of the root part of a path or URL (i.e. length of "/", "x:/", "//server/share/, file:///user/files").
-     * If the root is part of a URL, the twos-complement of the root length is returned.
-     */
-    function getEncodedRootLength(path) {
-        if (!path)
-            return 0;
-        var ch0 = path.charCodeAt(0);
-        // POSIX or UNC
-        if (ch0 === 47 /* slash */ || ch0 === 92 /* backslash */) {
-            if (path.charCodeAt(1) !== ch0)
-                return 1; // POSIX: "/" (or non-normalized "\")
-            var p1 = path.indexOf(ch0 === 47 /* slash */ ? ts.directorySeparator : altDirectorySeparator, 2);
-            if (p1 < 0)
-                return path.length; // UNC: "//server" or "\\server"
-            return p1 + 1; // UNC: "//server/" or "\\server\"
-        }
-        // DOS
-        if (isVolumeCharacter(ch0) && path.charCodeAt(1) === 58 /* colon */) {
-            var ch2 = path.charCodeAt(2);
-            if (ch2 === 47 /* slash */ || ch2 === 92 /* backslash */)
-                return 3; // DOS: "c:/" or "c:\"
-            if (path.length === 2)
-                return 2; // DOS: "c:" (but not "c:d")
-        }
-        // URL
-        var schemeEnd = path.indexOf(urlSchemeSeparator);
-        if (schemeEnd !== -1) {
-            var authorityStart = schemeEnd + urlSchemeSeparator.length;
-            var authorityEnd = path.indexOf(ts.directorySeparator, authorityStart);
-            if (authorityEnd !== -1) { // URL: "file:///", "file://server/", "file://server/path"
-                // For local "file" URLs, include the leading DOS volume (if present).
-                // Per https://www.ietf.org/rfc/rfc1738.txt, a host of "" or "localhost" is a
-                // special case interpreted as "the machine from which the URL is being interpreted".
-                var scheme = path.slice(0, schemeEnd);
-                var authority = path.slice(authorityStart, authorityEnd);
-                if (scheme === "file" && (authority === "" || authority === "localhost") &&
-                    isVolumeCharacter(path.charCodeAt(authorityEnd + 1))) {
-                    var volumeSeparatorEnd = getFileUrlVolumeSeparatorEnd(path, authorityEnd + 2);
-                    if (volumeSeparatorEnd !== -1) {
-                        if (path.charCodeAt(volumeSeparatorEnd) === 47 /* slash */) {
-                            // URL: "file:///c:/", "file://localhost/c:/", "file:///c%3a/", "file://localhost/c%3a/"
-                            return ~(volumeSeparatorEnd + 1);
-                        }
-                        if (volumeSeparatorEnd === path.length) {
-                            // URL: "file:///c:", "file://localhost/c:", "file:///c$3a", "file://localhost/c%3a"
-                            // but not "file:///c:d" or "file:///c%3ad"
-                            return ~volumeSeparatorEnd;
-                        }
-                    }
-                }
-                return ~(authorityEnd + 1); // URL: "file://server/", "http://server/"
-            }
-            return ~path.length; // URL: "file://server", "http://server"
-        }
-        // relative
-        return 0;
-    }
-    /**
-     * Returns length of the root part of a path or URL (i.e. length of "/", "x:/", "//server/share/, file:///user/files").
-     *
-     * For example:
-     * ```ts
-     * getRootLength("a") === 0                   // ""
-     * getRootLength("/") === 1                   // "/"
-     * getRootLength("c:") === 2                  // "c:"
-     * getRootLength("c:d") === 0                 // ""
-     * getRootLength("c:/") === 3                 // "c:/"
-     * getRootLength("c:\\") === 3                // "c:\\"
-     * getRootLength("//server") === 7            // "//server"
-     * getRootLength("//server/share") === 8      // "//server/"
-     * getRootLength("\\\\server") === 7          // "\\\\server"
-     * getRootLength("\\\\server\\share") === 8   // "\\\\server\\"
-     * getRootLength("file:///path") === 8        // "file:///"
-     * getRootLength("file:///c:") === 10         // "file:///c:"
-     * getRootLength("file:///c:d") === 8         // "file:///"
-     * getRootLength("file:///c:/path") === 11    // "file:///c:/"
-     * getRootLength("file://server") === 13      // "file://server"
-     * getRootLength("file://server/path") === 14 // "file://server/"
-     * getRootLength("http://server") === 13      // "http://server"
-     * getRootLength("http://server/path") === 14 // "http://server/"
-     * ```
-     */
-    function getRootLength(path) {
-        var rootLength = getEncodedRootLength(path);
-        return rootLength < 0 ? ~rootLength : rootLength;
-    }
-    ts.getRootLength = getRootLength;
-    // TODO(rbuckton): replace references with `resolvePath`
-    function normalizePath(path) {
-        return resolvePath(path);
-    }
-    ts.normalizePath = normalizePath;
-    function normalizePathAndParts(path) {
-        path = normalizeSlashes(path);
-        var _a = reducePathComponents(getPathComponents(path)), root = _a[0], parts = _a.slice(1);
-        if (parts.length) {
-            var joinedParts = root + parts.join(ts.directorySeparator);
-            return { path: hasTrailingDirectorySeparator(path) ? ensureTrailingDirectorySeparator(joinedParts) : joinedParts, parts: parts };
-        }
-        else {
-            return { path: root, parts: parts };
-        }
-    }
-    ts.normalizePathAndParts = normalizePathAndParts;
-    function getDirectoryPath(path) {
-        path = normalizeSlashes(path);
-        // If the path provided is itself the root, then return it.
-        var rootLength = getRootLength(path);
-        if (rootLength === path.length)
-            return path;
-        // return the leading portion of the path up to the last (non-terminal) directory separator
-        // but not including any trailing directory separator.
-        path = removeTrailingDirectorySeparator(path);
-        return path.slice(0, Math.max(rootLength, path.lastIndexOf(ts.directorySeparator)));
-    }
-    ts.getDirectoryPath = getDirectoryPath;
-    function isUrl(path) {
-        return getEncodedRootLength(path) < 0;
-    }
-    ts.isUrl = isUrl;
-    function pathIsRelative(path) {
-        return /^\.\.?($|[\\/])/.test(path);
-    }
-    ts.pathIsRelative = pathIsRelative;
-    /**
-     * Determines whether a path is an absolute path (e.g. starts with `/`, or a dos path
-     * like `c:`, `c:\` or `c:/`).
-     */
-    function isRootedDiskPath(path) {
-        return getEncodedRootLength(path) > 0;
-    }
-    ts.isRootedDiskPath = isRootedDiskPath;
-    /**
-     * Determines whether a path consists only of a path root.
-     */
-    function isDiskPathRoot(path) {
-        var rootLength = getEncodedRootLength(path);
-        return rootLength > 0 && rootLength === path.length;
-    }
-    ts.isDiskPathRoot = isDiskPathRoot;
-    function convertToRelativePath(absoluteOrRelativePath, basePath, getCanonicalFileName) {
-        return !isRootedDiskPath(absoluteOrRelativePath)
-            ? absoluteOrRelativePath
-            : getRelativePathToDirectoryOrUrl(basePath, absoluteOrRelativePath, basePath, getCanonicalFileName, /*isAbsolutePathAnUrl*/ false);
-    }
-    ts.convertToRelativePath = convertToRelativePath;
-    function pathComponents(path, rootLength) {
-        var root = path.substring(0, rootLength);
-        var rest = path.substring(rootLength).split(ts.directorySeparator);
-        if (rest.length && !lastOrUndefined(rest))
-            rest.pop();
-        return [root].concat(rest);
-    }
-    /**
-     * Parse a path into an array containing a root component (at index 0) and zero or more path
-     * components (at indices > 0). The result is not normalized.
-     * If the path is relative, the root component is `""`.
-     * If the path is absolute, the root component includes the first path separator (`/`).
-     */
-    function getPathComponents(path, currentDirectory) {
-        if (currentDirectory === void 0) { currentDirectory = ""; }
-        path = combinePaths(currentDirectory, path);
-        var rootLength = getRootLength(path);
-        return pathComponents(path, rootLength);
-    }
-    ts.getPathComponents = getPathComponents;
-    /**
-     * Reduce an array of path components to a more simplified path by navigating any
-     * `"."` or `".."` entries in the path.
-     */
-    function reducePathComponents(components) {
-        if (!some(components))
-            return [];
-        var reduced = [components[0]];
-        for (var i = 1; i < components.length; i++) {
-            var component = components[i];
-            if (!component)
-                continue;
-            if (component === ".")
-                continue;
-            if (component === "..") {
-                if (reduced.length > 1) {
-                    if (reduced[reduced.length - 1] !== "..") {
-                        reduced.pop();
-                        continue;
-                    }
-                }
-                else if (reduced[0])
-                    continue;
-            }
-            reduced.push(component);
-        }
-        return reduced;
-    }
-    ts.reducePathComponents = reducePathComponents;
-    /**
-     * Parse a path into an array containing a root component (at index 0) and zero or more path
-     * components (at indices > 0). The result is normalized.
-     * If the path is relative, the root component is `""`.
-     * If the path is absolute, the root component includes the first path separator (`/`).
-     */
-    function getNormalizedPathComponents(path, currentDirectory) {
-        return reducePathComponents(getPathComponents(path, currentDirectory));
-    }
-    ts.getNormalizedPathComponents = getNormalizedPathComponents;
-    function getNormalizedAbsolutePath(fileName, currentDirectory) {
-        return getPathFromPathComponents(getNormalizedPathComponents(fileName, currentDirectory));
-    }
-    ts.getNormalizedAbsolutePath = getNormalizedAbsolutePath;
-    /**
-     * Formats a parsed path consisting of a root component (at index 0) and zero or more path
-     * segments (at indices > 0).
-     */
-    function getPathFromPathComponents(pathComponents) {
-        if (pathComponents.length === 0)
-            return "";
-        var root = pathComponents[0] && ensureTrailingDirectorySeparator(pathComponents[0]);
-        if (pathComponents.length === 1)
-            return root;
-        return root + pathComponents.slice(1).join(ts.directorySeparator);
-    }
-    ts.getPathFromPathComponents = getPathFromPathComponents;
-    function getPathComponentsRelativeTo(from, to, stringEqualityComparer, getCanonicalFileName) {
-        var fromComponents = reducePathComponents(getPathComponents(from));
-        var toComponents = reducePathComponents(getPathComponents(to));
-        var start;
-        for (start = 0; start < fromComponents.length && start < toComponents.length; start++) {
-            var fromComponent = getCanonicalFileName(fromComponents[start]);
-            var toComponent = getCanonicalFileName(toComponents[start]);
-            var comparer = start === 0 ? equateStringsCaseInsensitive : stringEqualityComparer;
-            if (!comparer(fromComponent, toComponent))
-                break;
-        }
-        if (start === 0) {
-            return toComponents;
-        }
-        var components = toComponents.slice(start);
-        var relative = [];
-        for (; start < fromComponents.length; start++) {
-            relative.push("..");
-        }
-        return [""].concat(relative, components);
-    }
-    function getRelativePathFromFile(from, to, getCanonicalFileName) {
-        return ensurePathIsNonModuleName(getRelativePathFromDirectory(getDirectoryPath(from), to, getCanonicalFileName));
-    }
-    ts.getRelativePathFromFile = getRelativePathFromFile;
-    function getRelativePathFromDirectory(fromDirectory, to, getCanonicalFileNameOrIgnoreCase) {
-        Debug.assert((getRootLength(fromDirectory) > 0) === (getRootLength(to) > 0), "Paths must either both be absolute or both be relative");
-        var getCanonicalFileName = typeof getCanonicalFileNameOrIgnoreCase === "function" ? getCanonicalFileNameOrIgnoreCase : identity;
-        var ignoreCase = typeof getCanonicalFileNameOrIgnoreCase === "boolean" ? getCanonicalFileNameOrIgnoreCase : false;
-        var pathComponents = getPathComponentsRelativeTo(fromDirectory, to, ignoreCase ? equateStringsCaseInsensitive : equateStringsCaseSensitive, getCanonicalFileName);
-        return getPathFromPathComponents(pathComponents);
-    }
-    ts.getRelativePathFromDirectory = getRelativePathFromDirectory;
-    function getRelativePathToDirectoryOrUrl(directoryPathOrUrl, relativeOrAbsolutePath, currentDirectory, getCanonicalFileName, isAbsolutePathAnUrl) {
-        var pathComponents = getPathComponentsRelativeTo(resolvePath(currentDirectory, directoryPathOrUrl), resolvePath(currentDirectory, relativeOrAbsolutePath), equateStringsCaseSensitive, getCanonicalFileName);
-        var firstComponent = pathComponents[0];
-        if (isAbsolutePathAnUrl && isRootedDiskPath(firstComponent)) {
-            var prefix = firstComponent.charAt(0) === ts.directorySeparator ? "file://" : "file:///";
-            pathComponents[0] = prefix + firstComponent;
-        }
-        return getPathFromPathComponents(pathComponents);
-    }
-    ts.getRelativePathToDirectoryOrUrl = getRelativePathToDirectoryOrUrl;
-    /**
-     * Ensures a path is either absolute (prefixed with `/` or `c:`) or dot-relative (prefixed
-     * with `./` or `../`) so as not to be confused with an unprefixed module name.
-     */
-    function ensurePathIsNonModuleName(path) {
-        return getRootLength(path) === 0 && !pathIsRelative(path) ? "./" + path : path;
-    }
-    ts.ensurePathIsNonModuleName = ensurePathIsNonModuleName;
-    function getBaseFileName(path, extensions, ignoreCase) {
-        path = normalizeSlashes(path);
-        // if the path provided is itself the root, then it has not file name.
-        var rootLength = getRootLength(path);
-        if (rootLength === path.length)
-            return "";
-        // return the trailing portion of the path starting after the last (non-terminal) directory
-        // separator but not including any trailing directory separator.
-        path = removeTrailingDirectorySeparator(path);
-        var name = path.slice(Math.max(getRootLength(path), path.lastIndexOf(ts.directorySeparator) + 1));
-        var extension = extensions !== undefined && ignoreCase !== undefined ? getAnyExtensionFromPath(name, extensions, ignoreCase) : undefined;
-        return extension ? name.slice(0, name.length - extension.length) : name;
-    }
-    ts.getBaseFileName = getBaseFileName;
-    /**
-     * Combines paths. If a path is absolute, it replaces any previous path.
-     */
-    function combinePaths(path) {
-        var paths = [];
-        for (var _i = 1; _i < arguments.length; _i++) {
-            paths[_i - 1] = arguments[_i];
-        }
-        if (path)
-            path = normalizeSlashes(path);
-        for (var _a = 0, paths_1 = paths; _a < paths_1.length; _a++) {
-            var relativePath = paths_1[_a];
-            if (!relativePath)
-                continue;
-            relativePath = normalizeSlashes(relativePath);
-            if (!path || getRootLength(relativePath) !== 0) {
-                path = relativePath;
-            }
-            else {
-                path = ensureTrailingDirectorySeparator(path) + relativePath;
-            }
-        }
-        return path;
-    }
-    ts.combinePaths = combinePaths;
-    /**
-     * Combines and resolves paths. If a path is absolute, it replaces any previous path. Any
-     * `.` and `..` path components are resolved.
-     */
-    function resolvePath(path) {
-        var paths = [];
-        for (var _i = 1; _i < arguments.length; _i++) {
-            paths[_i - 1] = arguments[_i];
-        }
-        var combined = some(paths) ? combinePaths.apply(void 0, [path].concat(paths)) : normalizeSlashes(path);
-        var normalized = getPathFromPathComponents(reducePathComponents(getPathComponents(combined)));
-        return normalized && hasTrailingDirectorySeparator(combined) ? ensureTrailingDirectorySeparator(normalized) : normalized;
-    }
-    ts.resolvePath = resolvePath;
-    /**
-     * Determines whether a path has a trailing separator (`/` or `\\`).
-     */
-    function hasTrailingDirectorySeparator(path) {
-        if (path.length === 0)
-            return false;
-        var ch = path.charCodeAt(path.length - 1);
-        return ch === 47 /* slash */ || ch === 92 /* backslash */;
-    }
-    ts.hasTrailingDirectorySeparator = hasTrailingDirectorySeparator;
-    function removeTrailingDirectorySeparator(path) {
-        if (hasTrailingDirectorySeparator(path)) {
-            return path.substr(0, path.length - 1);
-        }
-        return path;
-    }
-    ts.removeTrailingDirectorySeparator = removeTrailingDirectorySeparator;
-    function ensureTrailingDirectorySeparator(path) {
-        if (!hasTrailingDirectorySeparator(path)) {
-            return path + ts.directorySeparator;
-        }
-        return path;
-    }
-    ts.ensureTrailingDirectorySeparator = ensureTrailingDirectorySeparator;
-    function comparePathsWorker(a, b, componentComparer) {
-        if (a === b)
-            return 0 /* EqualTo */;
-        if (a === undefined)
-            return -1 /* LessThan */;
-        if (b === undefined)
-            return 1 /* GreaterThan */;
-        var aComponents = reducePathComponents(getPathComponents(a));
-        var bComponents = reducePathComponents(getPathComponents(b));
-        var sharedLength = Math.min(aComponents.length, bComponents.length);
-        for (var i = 0; i < sharedLength; i++) {
-            var stringComparer = i === 0 ? compareStringsCaseInsensitive : componentComparer;
-            var result = stringComparer(aComponents[i], bComponents[i]);
-            if (result !== 0 /* EqualTo */) {
-                return result;
-            }
-        }
-        return compareValues(aComponents.length, bComponents.length);
-    }
-    /**
-     * Performs a case-sensitive comparison of two paths.
-     */
-    function comparePathsCaseSensitive(a, b) {
-        return comparePathsWorker(a, b, compareStringsCaseSensitive);
-    }
-    ts.comparePathsCaseSensitive = comparePathsCaseSensitive;
-    /**
-     * Performs a case-insensitive comparison of two paths.
-     */
-    function comparePathsCaseInsensitive(a, b) {
-        return comparePathsWorker(a, b, compareStringsCaseInsensitive);
-    }
-    ts.comparePathsCaseInsensitive = comparePathsCaseInsensitive;
-    function comparePaths(a, b, currentDirectory, ignoreCase) {
-        if (typeof currentDirectory === "string") {
-            a = combinePaths(currentDirectory, a);
-            b = combinePaths(currentDirectory, b);
-        }
-        else if (typeof currentDirectory === "boolean") {
-            ignoreCase = currentDirectory;
-        }
-        return comparePathsWorker(a, b, getStringComparer(ignoreCase));
-    }
-    ts.comparePaths = comparePaths;
-    function containsPath(parent, child, currentDirectory, ignoreCase) {
-        if (typeof currentDirectory === "string") {
-            parent = combinePaths(currentDirectory, parent);
-            child = combinePaths(currentDirectory, child);
-        }
-        else if (typeof currentDirectory === "boolean") {
-            ignoreCase = currentDirectory;
-        }
-        if (parent === undefined || child === undefined)
-            return false;
-        if (parent === child)
-            return true;
-        var parentComponents = reducePathComponents(getPathComponents(parent));
-        var childComponents = reducePathComponents(getPathComponents(child));
-        if (childComponents.length < parentComponents.length) {
-            return false;
-        }
-        var componentEqualityComparer = ignoreCase ? equateStringsCaseInsensitive : equateStringsCaseSensitive;
-        for (var i = 0; i < parentComponents.length; i++) {
-            var equalityComparer = i === 0 ? equateStringsCaseInsensitive : componentEqualityComparer;
-            if (!equalityComparer(parentComponents[i], childComponents[i])) {
-                return false;
-            }
-        }
-        return true;
-    }
-    ts.containsPath = containsPath;
-    function startsWith(str, prefix) {
-        return str.lastIndexOf(prefix, 0) === 0;
-    }
-    ts.startsWith = startsWith;
-    function removePrefix(str, prefix) {
-        return startsWith(str, prefix) ? str.substr(prefix.length) : str;
-    }
-    ts.removePrefix = removePrefix;
-    function tryRemovePrefix(str, prefix) {
-        return startsWith(str, prefix) ? str.substring(prefix.length) : undefined;
-    }
-    ts.tryRemovePrefix = tryRemovePrefix;
-    function tryRemoveDirectoryPrefix(path, dirPath) {
-        var a = tryRemovePrefix(path, dirPath);
-        if (a === undefined)
-            return undefined;
-        switch (a.charCodeAt(0)) {
-            case 47 /* slash */:
-            case 92 /* backslash */:
-                return a.slice(1);
-            default:
-                return undefined;
-        }
-    }
-    ts.tryRemoveDirectoryPrefix = tryRemoveDirectoryPrefix;
-    function endsWith(str, suffix) {
-        var expectedPos = str.length - suffix.length;
-        return expectedPos >= 0 && str.indexOf(suffix, expectedPos) === expectedPos;
-    }
-    ts.endsWith = endsWith;
-    function removeSuffix(str, suffix) {
-        return endsWith(str, suffix) ? str.slice(0, str.length - suffix.length) : str;
-    }
-    ts.removeSuffix = removeSuffix;
-    function tryRemoveSuffix(str, suffix) {
-        return endsWith(str, suffix) ? str.slice(0, str.length - suffix.length) : undefined;
-    }
-    ts.tryRemoveSuffix = tryRemoveSuffix;
-    function stringContains(str, substring) {
-        return str.indexOf(substring) !== -1;
-    }
-    ts.stringContains = stringContains;
-    function hasExtension(fileName) {
-        return stringContains(getBaseFileName(fileName), ".");
-    }
-    ts.hasExtension = hasExtension;
-    function fileExtensionIs(path, extension) {
-        return path.length > extension.length && endsWith(path, extension);
-    }
-    ts.fileExtensionIs = fileExtensionIs;
-    function fileExtensionIsOneOf(path, extensions) {
-        for (var _i = 0, extensions_1 = extensions; _i < extensions_1.length; _i++) {
-            var extension = extensions_1[_i];
-            if (fileExtensionIs(path, extension)) {
-                return true;
-            }
-        }
-        return false;
-    }
-    ts.fileExtensionIsOneOf = fileExtensionIsOneOf;
-    // Reserved characters, forces escaping of any non-word (or digit), non-whitespace character.
-    // It may be inefficient (we could just match (/[-[\]{}()*+?.,\\^$|#\s]/g), but this is future
-    // proof.
-    var reservedCharacterPattern = /[^\w\s\/]/g;
-    var wildcardCharCodes = [42 /* asterisk */, 63 /* question */];
-    ts.commonPackageFolders = ["node_modules", "bower_components", "jspm_packages"];
-    var implicitExcludePathRegexPattern = "(?!(" + ts.commonPackageFolders.join("|") + ")(/|$))";
-    var filesMatcher = {
-        /**
-         * Matches any single directory segment unless it is the last segment and a .min.js file
-         * Breakdown:
-         *  [^./]                   # matches everything up to the first . character (excluding directory separators)
-         *  (\\.(?!min\\.js$))?     # matches . characters but not if they are part of the .min.js file extension
-         */
-        singleAsteriskRegexFragment: "([^./]|(\\.(?!min\\.js$))?)*",
-        /**
-         * Regex for the ** wildcard. Matches any number of subdirectories. When used for including
-         * files or directories, does not match subdirectories that start with a . character
-         */
-        doubleAsteriskRegexFragment: "(/" + implicitExcludePathRegexPattern + "[^/.][^/]*)*?",
-        replaceWildcardCharacter: function (match) { return replaceWildcardCharacter(match, filesMatcher.singleAsteriskRegexFragment); }
-    };
-    var directoriesMatcher = {
-        singleAsteriskRegexFragment: "[^/]*",
-        /**
-         * Regex for the ** wildcard. Matches any number of subdirectories. When used for including
-         * files or directories, does not match subdirectories that start with a . character
-         */
-        doubleAsteriskRegexFragment: "(/" + implicitExcludePathRegexPattern + "[^/.][^/]*)*?",
-        replaceWildcardCharacter: function (match) { return replaceWildcardCharacter(match, directoriesMatcher.singleAsteriskRegexFragment); }
-    };
-    var excludeMatcher = {
-        singleAsteriskRegexFragment: "[^/]*",
-        doubleAsteriskRegexFragment: "(/.+?)?",
-        replaceWildcardCharacter: function (match) { return replaceWildcardCharacter(match, excludeMatcher.singleAsteriskRegexFragment); }
-    };
-    var wildcardMatchers = {
-        files: filesMatcher,
-        directories: directoriesMatcher,
-        exclude: excludeMatcher
-    };
-    function getRegularExpressionForWildcard(specs, basePath, usage) {
-        var patterns = getRegularExpressionsForWildcards(specs, basePath, usage);
-        if (!patterns || !patterns.length) {
-            return undefined;
-        }
-        var pattern = patterns.map(function (pattern) { return "(" + pattern + ")"; }).join("|");
-        // If excluding, match "foo/bar/baz...", but if including, only allow "foo".
-        var terminator = usage === "exclude" ? "($|/)" : "$";
-        return "^(" + pattern + ")" + terminator;
-    }
-    ts.getRegularExpressionForWildcard = getRegularExpressionForWildcard;
-    function getRegularExpressionsForWildcards(specs, basePath, usage) {
-        if (specs === undefined || specs.length === 0) {
-            return undefined;
-        }
-        return flatMap(specs, function (spec) {
-            return spec && getSubPatternFromSpec(spec, basePath, usage, wildcardMatchers[usage]);
-        });
-    }
-    /**
-     * An "includes" path "foo" is implicitly a glob "foo/** /*" (without the space) if its last component has no extension,
-     * and does not contain any glob characters itself.
-     */
-    function isImplicitGlob(lastPathComponent) {
-        return !/[.*?]/.test(lastPathComponent);
-    }
-    ts.isImplicitGlob = isImplicitGlob;
-    function getSubPatternFromSpec(spec, basePath, usage, _a) {
-        var singleAsteriskRegexFragment = _a.singleAsteriskRegexFragment, doubleAsteriskRegexFragment = _a.doubleAsteriskRegexFragment, replaceWildcardCharacter = _a.replaceWildcardCharacter;
-        var subpattern = "";
-        var hasWrittenComponent = false;
-        var components = getNormalizedPathComponents(spec, basePath);
-        var lastComponent = last(components);
-        if (usage !== "exclude" && lastComponent === "**") {
-            return undefined;
-        }
-        // getNormalizedPathComponents includes the separator for the root component.
-        // We need to remove to create our regex correctly.
-        components[0] = removeTrailingDirectorySeparator(components[0]);
-        if (isImplicitGlob(lastComponent)) {
-            components.push("**", "*");
-        }
-        var optionalCount = 0;
-        for (var _i = 0, components_1 = components; _i < components_1.length; _i++) {
-            var component = components_1[_i];
-            if (component === "**") {
-                subpattern += doubleAsteriskRegexFragment;
-            }
-            else {
-                if (usage === "directories") {
-                    subpattern += "(";
-                    optionalCount++;
-                }
-                if (hasWrittenComponent) {
-                    subpattern += ts.directorySeparator;
-                }
-                if (usage !== "exclude") {
-                    var componentPattern = "";
-                    // The * and ? wildcards should not match directories or files that start with . if they
-                    // appear first in a component. Dotted directories and files can be included explicitly
-                    // like so: **/.*/.*
-                    if (component.charCodeAt(0) === 42 /* asterisk */) {
-                        componentPattern += "([^./]" + singleAsteriskRegexFragment + ")?";
-                        component = component.substr(1);
-                    }
-                    else if (component.charCodeAt(0) === 63 /* question */) {
-                        componentPattern += "[^./]";
-                        component = component.substr(1);
-                    }
-                    componentPattern += component.replace(reservedCharacterPattern, replaceWildcardCharacter);
-                    // Patterns should not include subfolders like node_modules unless they are
-                    // explicitly included as part of the path.
-                    //
-                    // As an optimization, if the component pattern is the same as the component,
-                    // then there definitely were no wildcard characters and we do not need to
-                    // add the exclusion pattern.
-                    if (componentPattern !== component) {
-                        subpattern += implicitExcludePathRegexPattern;
-                    }
-                    subpattern += componentPattern;
-                }
-                else {
-                    subpattern += component.replace(reservedCharacterPattern, replaceWildcardCharacter);
-                }
-            }
-            hasWrittenComponent = true;
-        }
-        while (optionalCount > 0) {
-            subpattern += ")?";
-            optionalCount--;
-        }
-        return subpattern;
-    }
-    function replaceWildcardCharacter(match, singleAsteriskRegexFragment) {
-        return match === "*" ? singleAsteriskRegexFragment : match === "?" ? "[^/]" : "\\" + match;
-    }
-    /** @param path directory of the tsconfig.json */
-    function getFileMatcherPatterns(path, excludes, includes, useCaseSensitiveFileNames, currentDirectory) {
-        path = normalizePath(path);
-        currentDirectory = normalizePath(currentDirectory);
-        var absolutePath = combinePaths(currentDirectory, path);
-        return {
-            includeFilePatterns: map(getRegularExpressionsForWildcards(includes, absolutePath, "files"), function (pattern) { return "^" + pattern + "$"; }),
-            includeFilePattern: getRegularExpressionForWildcard(includes, absolutePath, "files"),
-            includeDirectoryPattern: getRegularExpressionForWildcard(includes, absolutePath, "directories"),
-            excludePattern: getRegularExpressionForWildcard(excludes, absolutePath, "exclude"),
-            basePaths: getBasePaths(path, includes, useCaseSensitiveFileNames)
-        };
-    }
-    ts.getFileMatcherPatterns = getFileMatcherPatterns;
-    function getRegexFromPattern(pattern, useCaseSensitiveFileNames) {
-        return new RegExp(pattern, useCaseSensitiveFileNames ? "" : "i");
-    }
-    ts.getRegexFromPattern = getRegexFromPattern;
-    /** @param path directory of the tsconfig.json */
-    function matchFiles(path, extensions, excludes, includes, useCaseSensitiveFileNames, currentDirectory, depth, getFileSystemEntries) {
-        path = normalizePath(path);
-        currentDirectory = normalizePath(currentDirectory);
-        var patterns = getFileMatcherPatterns(path, excludes, includes, useCaseSensitiveFileNames, currentDirectory);
-        var includeFileRegexes = patterns.includeFilePatterns && patterns.includeFilePatterns.map(function (pattern) { return getRegexFromPattern(pattern, useCaseSensitiveFileNames); });
-        var includeDirectoryRegex = patterns.includeDirectoryPattern && getRegexFromPattern(patterns.includeDirectoryPattern, useCaseSensitiveFileNames);
-        var excludeRegex = patterns.excludePattern && getRegexFromPattern(patterns.excludePattern, useCaseSensitiveFileNames);
-        // Associate an array of results with each include regex. This keeps results in order of the "include" order.
-        // If there are no "includes", then just put everything in results[0].
-        var results = includeFileRegexes ? includeFileRegexes.map(function () { return []; }) : [[]];
-        for (var _i = 0, _a = patterns.basePaths; _i < _a.length; _i++) {
-            var basePath = _a[_i];
-            visitDirectory(basePath, combinePaths(currentDirectory, basePath), depth);
-        }
-        return flatten(results);
-        function visitDirectory(path, absolutePath, depth) {
-            var _a = getFileSystemEntries(path), files = _a.files, directories = _a.directories;
-            var _loop_1 = function (current) {
-                var name = combinePaths(path, current);
-                var absoluteName = combinePaths(absolutePath, current);
-                if (extensions && !fileExtensionIsOneOf(name, extensions))
-                    return "continue";
-                if (excludeRegex && excludeRegex.test(absoluteName))
-                    return "continue";
-                if (!includeFileRegexes) {
-                    results[0].push(name);
-                }
-                else {
-                    var includeIndex = findIndex(includeFileRegexes, function (re) { return re.test(absoluteName); });
-                    if (includeIndex !== -1) {
-                        results[includeIndex].push(name);
-                    }
-                }
-            };
-            for (var _i = 0, _b = sort(files, compareStringsCaseSensitive); _i < _b.length; _i++) {
-                var current = _b[_i];
-                _loop_1(current);
-            }
-            if (depth !== undefined) {
-                depth--;
-                if (depth === 0) {
-                    return;
-                }
-            }
-            for (var _c = 0, _d = sort(directories, compareStringsCaseSensitive); _c < _d.length; _c++) {
-                var current = _d[_c];
-                var name = combinePaths(path, current);
-                var absoluteName = combinePaths(absolutePath, current);
-                if ((!includeDirectoryRegex || includeDirectoryRegex.test(absoluteName)) &&
-                    (!excludeRegex || !excludeRegex.test(absoluteName))) {
-                    visitDirectory(name, absoluteName, depth);
-                }
-            }
-        }
-    }
-    ts.matchFiles = matchFiles;
-    /**
-     * Computes the unique non-wildcard base paths amongst the provided include patterns.
-     */
-    function getBasePaths(path, includes, useCaseSensitiveFileNames) {
-        // Storage for our results in the form of literal paths (e.g. the paths as written by the user).
-        var basePaths = [path];
-        if (includes) {
-            // Storage for literal base paths amongst the include patterns.
-            var includeBasePaths = [];
-            for (var _i = 0, includes_1 = includes; _i < includes_1.length; _i++) {
-                var include = includes_1[_i];
-                // We also need to check the relative paths by converting them to absolute and normalizing
-                // in case they escape the base path (e.g "..\somedirectory")
-                var absolute = isRootedDiskPath(include) ? include : normalizePath(combinePaths(path, include));
-                // Append the literal and canonical candidate base paths.
-                includeBasePaths.push(getIncludeBasePath(absolute));
-            }
-            // Sort the offsets array using either the literal or canonical path representations.
-            includeBasePaths.sort(getStringComparer(!useCaseSensitiveFileNames));
-            var _loop_2 = function (includeBasePath) {
-                if (every(basePaths, function (basePath) { return !containsPath(basePath, includeBasePath, path, !useCaseSensitiveFileNames); })) {
-                    basePaths.push(includeBasePath);
-                }
-            };
-            // Iterate over each include base path and include unique base paths that are not a
-            // subpath of an existing base path
-            for (var _a = 0, includeBasePaths_1 = includeBasePaths; _a < includeBasePaths_1.length; _a++) {
-                var includeBasePath = includeBasePaths_1[_a];
-                _loop_2(includeBasePath);
-            }
-        }
-        return basePaths;
-    }
-    function getIncludeBasePath(absolute) {
-        var wildcardOffset = indexOfAnyCharCode(absolute, wildcardCharCodes);
-        if (wildcardOffset < 0) {
-            // No "*" or "?" in the path
-            return !hasExtension(absolute)
-                ? absolute
-                : removeTrailingDirectorySeparator(getDirectoryPath(absolute));
-        }
-        return absolute.substring(0, absolute.lastIndexOf(ts.directorySeparator, wildcardOffset));
-    }
-    function ensureScriptKind(fileName, scriptKind) {
-        // Using scriptKind as a condition handles both:
-        // - 'scriptKind' is unspecified and thus it is `undefined`
-        // - 'scriptKind' is set and it is `Unknown` (0)
-        // If the 'scriptKind' is 'undefined' or 'Unknown' then we attempt
-        // to get the ScriptKind from the file name. If it cannot be resolved
-        // from the file name then the default 'TS' script kind is returned.
-        return scriptKind || getScriptKindFromFileName(fileName) || 3 /* TS */;
-    }
-    ts.ensureScriptKind = ensureScriptKind;
-    function getScriptKindFromFileName(fileName) {
-        var ext = fileName.substr(fileName.lastIndexOf("."));
-        switch (ext.toLowerCase()) {
-            case ".js" /* Js */:
-                return 1 /* JS */;
-            case ".jsx" /* Jsx */:
-                return 2 /* JSX */;
-            case ".ts" /* Ts */:
-                return 3 /* TS */;
-            case ".tsx" /* Tsx */:
-                return 4 /* TSX */;
-            case ".json" /* Json */:
-                return 6 /* JSON */;
-            default:
-                return 0 /* Unknown */;
-        }
-    }
-    ts.getScriptKindFromFileName = getScriptKindFromFileName;
-    /**
-     *  List of supported extensions in order of file resolution precedence.
-     */
-    ts.supportedTypeScriptExtensions = [".ts" /* Ts */, ".tsx" /* Tsx */, ".d.ts" /* Dts */];
-    /** Must have ".d.ts" first because if ".ts" goes first, that will be detected as the extension instead of ".d.ts". */
-    ts.supportedTypescriptExtensionsForExtractExtension = [".d.ts" /* Dts */, ".ts" /* Ts */, ".tsx" /* Tsx */];
-    ts.supportedJavascriptExtensions = [".js" /* Js */, ".jsx" /* Jsx */];
-    var allSupportedExtensions = ts.supportedTypeScriptExtensions.concat(ts.supportedJavascriptExtensions);
-    function getSupportedExtensions(options, extraFileExtensions) {
-        var needJsExtensions = options && options.allowJs;
-        if (!extraFileExtensions || extraFileExtensions.length === 0) {
-            return needJsExtensions ? allSupportedExtensions : ts.supportedTypeScriptExtensions;
-        }
-        var extensions = (needJsExtensions ? allSupportedExtensions : ts.supportedTypeScriptExtensions).concat(mapDefined(extraFileExtensions, function (x) { return x.scriptKind === 7 /* Deferred */ || needJsExtensions && isJavaScriptLike(x.scriptKind) ? x.extension : undefined; }));
-        return deduplicate(extensions, equateStringsCaseSensitive, compareStringsCaseSensitive);
-    }
-    ts.getSupportedExtensions = getSupportedExtensions;
-    function isJavaScriptLike(scriptKind) {
-        return scriptKind === 1 /* JS */ || scriptKind === 2 /* JSX */;
-    }
-    function hasJavaScriptFileExtension(fileName) {
-        return some(ts.supportedJavascriptExtensions, function (extension) { return fileExtensionIs(fileName, extension); });
-    }
-    ts.hasJavaScriptFileExtension = hasJavaScriptFileExtension;
-    function hasTypeScriptFileExtension(fileName) {
-        return some(ts.supportedTypeScriptExtensions, function (extension) { return fileExtensionIs(fileName, extension); });
-    }
-    ts.hasTypeScriptFileExtension = hasTypeScriptFileExtension;
-    function isSupportedSourceFileName(fileName, compilerOptions, extraFileExtensions) {
-        if (!fileName) {
-            return false;
-        }
-        for (var _i = 0, _a = getSupportedExtensions(compilerOptions, extraFileExtensions); _i < _a.length; _i++) {
-            var extension = _a[_i];
-            if (fileExtensionIs(fileName, extension)) {
-                return true;
-            }
-        }
-        return false;
-    }
-    ts.isSupportedSourceFileName = isSupportedSourceFileName;
-    /**
-     * Extension boundaries by priority. Lower numbers indicate higher priorities, and are
-     * aligned to the offset of the highest priority extension in the
-     * allSupportedExtensions array.
-     */
-    var ExtensionPriority;
-    (function (ExtensionPriority) {
-        ExtensionPriority[ExtensionPriority["TypeScriptFiles"] = 0] = "TypeScriptFiles";
-        ExtensionPriority[ExtensionPriority["DeclarationAndJavaScriptFiles"] = 2] = "DeclarationAndJavaScriptFiles";
-        ExtensionPriority[ExtensionPriority["Highest"] = 0] = "Highest";
-        ExtensionPriority[ExtensionPriority["Lowest"] = 2] = "Lowest";
-    })(ExtensionPriority = ts.ExtensionPriority || (ts.ExtensionPriority = {}));
-    function getExtensionPriority(path, supportedExtensions) {
-        for (var i = supportedExtensions.length - 1; i >= 0; i--) {
-            if (fileExtensionIs(path, supportedExtensions[i])) {
-                return adjustExtensionPriority(i, supportedExtensions);
-            }
-        }
-        // If its not in the list of supported extensions, this is likely a
-        // TypeScript file with a non-ts extension
-        return 0 /* Highest */;
-    }
-    ts.getExtensionPriority = getExtensionPriority;
-    /**
-     * Adjusts an extension priority to be the highest priority within the same range.
-     */
-    function adjustExtensionPriority(extensionPriority, supportedExtensions) {
-        if (extensionPriority < 2 /* DeclarationAndJavaScriptFiles */) {
-            return 0 /* TypeScriptFiles */;
-        }
-        else if (extensionPriority < supportedExtensions.length) {
-            return 2 /* DeclarationAndJavaScriptFiles */;
-        }
-        else {
-            return supportedExtensions.length;
-        }
-    }
-    ts.adjustExtensionPriority = adjustExtensionPriority;
-    /**
-     * Gets the next lowest extension priority for a given priority.
-     */
-    function getNextLowestExtensionPriority(extensionPriority, supportedExtensions) {
-        if (extensionPriority < 2 /* DeclarationAndJavaScriptFiles */) {
-            return 2 /* DeclarationAndJavaScriptFiles */;
-        }
-        else {
-            return supportedExtensions.length;
-        }
-    }
-    ts.getNextLowestExtensionPriority = getNextLowestExtensionPriority;
-    var extensionsToRemove = [".d.ts" /* Dts */, ".ts" /* Ts */, ".js" /* Js */, ".tsx" /* Tsx */, ".jsx" /* Jsx */, ".json" /* Json */];
-    function removeFileExtension(path) {
-        for (var _i = 0, extensionsToRemove_1 = extensionsToRemove; _i < extensionsToRemove_1.length; _i++) {
-            var ext = extensionsToRemove_1[_i];
-            var extensionless = tryRemoveExtension(path, ext);
-            if (extensionless !== undefined) {
-                return extensionless;
-            }
-        }
-        return path;
-    }
-    ts.removeFileExtension = removeFileExtension;
-    function tryRemoveExtension(path, extension) {
-        return fileExtensionIs(path, extension) ? removeExtension(path, extension) : undefined;
-    }
-    ts.tryRemoveExtension = tryRemoveExtension;
-    function removeExtension(path, extension) {
-        return path.substring(0, path.length - extension.length);
-    }
-    ts.removeExtension = removeExtension;
-    function changeExtension(path, newExtension) {
-        return changeAnyExtension(path, newExtension, extensionsToRemove, /*ignoreCase*/ false);
-    }
-    ts.changeExtension = changeExtension;
-    function changeAnyExtension(path, ext, extensions, ignoreCase) {
-        var pathext = extensions !== undefined && ignoreCase !== undefined ? getAnyExtensionFromPath(path, extensions, ignoreCase) : getAnyExtensionFromPath(path);
-        return pathext ? path.slice(0, path.length - pathext.length) + (startsWith(ext, ".") ? ext : "." + ext) : path;
-    }
-    ts.changeAnyExtension = changeAnyExtension;
-    /**
-     * Takes a string like "jquery-min.4.2.3" and returns "jquery"
-     */
-    function removeMinAndVersionNumbers(fileName) {
-        // Match a "." or "-" followed by a version number or 'min' at the end of the name
-        var trailingMinOrVersion = /[.-]((min)|(\d+(\.\d+)*))$/;
-        // The "min" or version may both be present, in either order, so try applying the above twice.
-        return fileName.replace(trailingMinOrVersion, "").replace(trailingMinOrVersion, "");
-    }
-    ts.removeMinAndVersionNumbers = removeMinAndVersionNumbers;
-    function Symbol(flags, name) {
-        this.flags = flags;
-        this.escapedName = name;
-        this.declarations = undefined;
-        this.valueDeclaration = undefined;
-        this.id = undefined;
-        this.mergeId = undefined;
-        this.parent = undefined;
-    }
-    function Type(checker, flags) {
-        this.flags = flags;
-        if (Debug.isDebugging) {
-            this.checker = checker;
-        }
-    }
-    function Signature() { } // tslint:disable-line no-empty
-    function Node(kind, pos, end) {
-        this.pos = pos;
-        this.end = end;
-        this.kind = kind;
-        this.id = 0;
-        this.flags = 0 /* None */;
-        this.modifierFlagsCache = 0 /* None */;
-        this.transformFlags = 0 /* None */;
-        this.parent = undefined;
-        this.original = undefined;
-    }
-    function SourceMapSource(fileName, text, skipTrivia) {
-        this.fileName = fileName;
-        this.text = text;
-        this.skipTrivia = skipTrivia || (function (pos) { return pos; });
-    }
-    ts.objectAllocator = {
-        getNodeConstructor: function () { return Node; },
-        getTokenConstructor: function () { return Node; },
-        getIdentifierConstructor: function () { return Node; },
-        getSourceFileConstructor: function () { return Node; },
-        getSymbolConstructor: function () { return Symbol; },
-        getTypeConstructor: function () { return Type; },
-        getSignatureConstructor: function () { return Signature; },
-        getSourceMapSourceConstructor: function () { return SourceMapSource; },
-    };
-    var AssertionLevel;
-    (function (AssertionLevel) {
-        AssertionLevel[AssertionLevel["None"] = 0] = "None";
-        AssertionLevel[AssertionLevel["Normal"] = 1] = "Normal";
-        AssertionLevel[AssertionLevel["Aggressive"] = 2] = "Aggressive";
-        AssertionLevel[AssertionLevel["VeryAggressive"] = 3] = "VeryAggressive";
-    })(AssertionLevel = ts.AssertionLevel || (ts.AssertionLevel = {}));
-    var Debug;
-    (function (Debug) {
-        Debug.currentAssertionLevel = 0 /* None */;
-        Debug.isDebugging = false;
-        function shouldAssert(level) {
-            return Debug.currentAssertionLevel >= level;
-        }
-        Debug.shouldAssert = shouldAssert;
-        function assert(expression, message, verboseDebugInfo, stackCrawlMark) {
-            if (!expression) {
-                if (verboseDebugInfo) {
-                    message += "\r\nVerbose Debug Information: " + (typeof verboseDebugInfo === "string" ? verboseDebugInfo : verboseDebugInfo());
-                }
-                fail(message ? "False expression: " + message : "False expression.", stackCrawlMark || assert);
-            }
-        }
-        Debug.assert = assert;
-        function assertEqual(a, b, msg, msg2) {
-            if (a !== b) {
-                var message = msg ? msg2 ? msg + " " + msg2 : msg : "";
-                fail("Expected " + a + " === " + b + ". " + message);
-            }
-        }
-        Debug.assertEqual = assertEqual;
-        function assertLessThan(a, b, msg) {
-            if (a >= b) {
-                fail("Expected " + a + " < " + b + ". " + (msg || ""));
-            }
-        }
-        Debug.assertLessThan = assertLessThan;
-        function assertLessThanOrEqual(a, b) {
-            if (a > b) {
-                fail("Expected " + a + " <= " + b);
-            }
-        }
-        Debug.assertLessThanOrEqual = assertLessThanOrEqual;
-        function assertGreaterThanOrEqual(a, b) {
-            if (a < b) {
-                fail("Expected " + a + " >= " + b);
-            }
-        }
-        Debug.assertGreaterThanOrEqual = assertGreaterThanOrEqual;
-        function fail(message, stackCrawlMark) {
-            debugger;
-            var e = new Error(message ? "Debug Failure. " + message : "Debug Failure.");
-            if (Error.captureStackTrace) {
-                Error.captureStackTrace(e, stackCrawlMark || fail);
-            }
-            throw e;
-        }
-        Debug.fail = fail;
-        function assertDefined(value, message) {
-            if (value === undefined || value === null)
-                return fail(message);
-            return value;
-        }
-        Debug.assertDefined = assertDefined;
-        function assertEachDefined(value, message) {
-            for (var _i = 0, value_1 = value; _i < value_1.length; _i++) {
-                var v = value_1[_i];
-                assertDefined(v, message);
-            }
-            return value;
-        }
-        Debug.assertEachDefined = assertEachDefined;
-        function assertNever(member, message, stackCrawlMark) {
-            return fail(message || "Illegal value: " + member, stackCrawlMark || assertNever);
-        }
-        Debug.assertNever = assertNever;
-        function getFunctionName(func) {
-            if (typeof func !== "function") {
-                return "";
-            }
-            else if (func.hasOwnProperty("name")) {
-                return func.name;
-            }
-            else {
-                var text = Function.prototype.toString.call(func);
-                var match = /^function\s+([\w\$]+)\s*\(/.exec(text);
-                return match ? match[1] : "";
-            }
-        }
-        Debug.getFunctionName = getFunctionName;
-        function showSymbol(symbol) {
-            var symbolFlags = ts.SymbolFlags;
-            return "{ flags: " + (symbolFlags ? showFlags(symbol.flags, symbolFlags) : symbol.flags) + "; declarations: " + map(symbol.declarations, showSyntaxKind) + " }";
-        }
-        Debug.showSymbol = showSymbol;
-        function showFlags(flags, flagsEnum) {
-            var out = [];
-            for (var pow = 0; pow <= 30; pow++) {
-                var n = 1 << pow;
-                if (flags & n) {
-                    out.push(flagsEnum[n]);
-                }
-            }
-            return out.join("|");
-        }
-        function showSyntaxKind(node) {
-            var syntaxKind = ts.SyntaxKind;
-            return syntaxKind ? syntaxKind[node.kind] : node.kind.toString();
-        }
-        Debug.showSyntaxKind = showSyntaxKind;
-    })(Debug = ts.Debug || (ts.Debug = {}));
-    /** Remove an item from an array, moving everything to its right one space left. */
-    function orderedRemoveItem(array, item) {
-        for (var i = 0; i < array.length; i++) {
-            if (array[i] === item) {
-                orderedRemoveItemAt(array, i);
-                return true;
-            }
-        }
-        return false;
-    }
-    ts.orderedRemoveItem = orderedRemoveItem;
-    /** Remove an item by index from an array, moving everything to its right one space left. */
-    function orderedRemoveItemAt(array, index) {
-        // This seems to be faster than either `array.splice(i, 1)` or `array.copyWithin(i, i+ 1)`.
-        for (var i = index; i < array.length - 1; i++) {
-            array[i] = array[i + 1];
-        }
-        array.pop();
-    }
-    ts.orderedRemoveItemAt = orderedRemoveItemAt;
-    function unorderedRemoveItemAt(array, index) {
-        // Fill in the "hole" left at `index`.
-        array[index] = array[array.length - 1];
-        array.pop();
-    }
-    ts.unorderedRemoveItemAt = unorderedRemoveItemAt;
-    /** Remove the *first* occurrence of `item` from the array. */
-    function unorderedRemoveItem(array, item) {
-        return unorderedRemoveFirstItemWhere(array, function (element) { return element === item; });
-    }
-    ts.unorderedRemoveItem = unorderedRemoveItem;
-    /** Remove the *first* element satisfying `predicate`. */
-    function unorderedRemoveFirstItemWhere(array, predicate) {
-        for (var i = 0; i < array.length; i++) {
-            if (predicate(array[i])) {
-                unorderedRemoveItemAt(array, i);
-                return true;
-            }
-        }
-        return false;
-    }
-    function createGetCanonicalFileName(useCaseSensitiveFileNames) {
-        return useCaseSensitiveFileNames ? identity : toLowerCase;
-    }
-    ts.createGetCanonicalFileName = createGetCanonicalFileName;
-    /**
-     * patternStrings contains both pattern strings (containing "*") and regular strings.
-     * Return an exact match if possible, or a pattern match, or undefined.
-     * (These are verified by verifyCompilerOptions to have 0 or 1 "*" characters.)
-     */
-    function matchPatternOrExact(patternStrings, candidate) {
-        var patterns = [];
-        for (var _i = 0, patternStrings_1 = patternStrings; _i < patternStrings_1.length; _i++) {
-            var patternString = patternStrings_1[_i];
-            var pattern = tryParsePattern(patternString);
-            if (pattern) {
-                patterns.push(pattern);
-            }
-            else if (patternString === candidate) {
-                // pattern was matched as is - no need to search further
-                return patternString;
-            }
-        }
-        return findBestPatternMatch(patterns, function (_) { return _; }, candidate);
-    }
-    ts.matchPatternOrExact = matchPatternOrExact;
-    function patternText(_a) {
-        var prefix = _a.prefix, suffix = _a.suffix;
-        return prefix + "*" + suffix;
-    }
-    ts.patternText = patternText;
-    /**
-     * Given that candidate matches pattern, returns the text matching the '*'.
-     * E.g.: matchedText(tryParsePattern("foo*baz"), "foobarbaz") === "bar"
-     */
-    function matchedText(pattern, candidate) {
-        Debug.assert(isPatternMatch(pattern, candidate));
-        return candidate.substring(pattern.prefix.length, candidate.length - pattern.suffix.length);
-    }
-    ts.matchedText = matchedText;
-    /** Return the object corresponding to the best pattern to match `candidate`. */
-    function findBestPatternMatch(values, getPattern, candidate) {
-        var matchedValue;
-        // use length of prefix as betterness criteria
-        var longestMatchPrefixLength = -1;
-        for (var _i = 0, values_2 = values; _i < values_2.length; _i++) {
-            var v = values_2[_i];
-            var pattern = getPattern(v);
-            if (isPatternMatch(pattern, candidate) && pattern.prefix.length > longestMatchPrefixLength) {
-                longestMatchPrefixLength = pattern.prefix.length;
-                matchedValue = v;
-            }
-        }
-        return matchedValue;
-    }
-    ts.findBestPatternMatch = findBestPatternMatch;
-    function isPatternMatch(_a, candidate) {
-        var prefix = _a.prefix, suffix = _a.suffix;
-        return candidate.length >= prefix.length + suffix.length &&
-            startsWith(candidate, prefix) &&
-            endsWith(candidate, suffix);
-    }
-    function tryParsePattern(pattern) {
-        // This should be verified outside of here and a proper error thrown.
-        Debug.assert(hasZeroOrOneAsteriskCharacter(pattern));
-        var indexOfStar = pattern.indexOf("*");
-        return indexOfStar === -1 ? undefined : {
-            prefix: pattern.substr(0, indexOfStar),
-            suffix: pattern.substr(indexOfStar + 1)
-        };
-    }
-    ts.tryParsePattern = tryParsePattern;
-    function positionIsSynthesized(pos) {
-        // This is a fast way of testing the following conditions:
-        //  pos === undefined || pos === null || isNaN(pos) || pos < 0;
-        return !(pos >= 0);
-    }
-    ts.positionIsSynthesized = positionIsSynthesized;
-    /** True if an extension is one of the supported TypeScript extensions. */
-    function extensionIsTypeScript(ext) {
-        return ext === ".ts" /* Ts */ || ext === ".tsx" /* Tsx */ || ext === ".d.ts" /* Dts */;
-    }
-    ts.extensionIsTypeScript = extensionIsTypeScript;
-    function resolutionExtensionIsTypeScriptOrJson(ext) {
-        return extensionIsTypeScript(ext) || ext === ".json" /* Json */;
-    }
-    ts.resolutionExtensionIsTypeScriptOrJson = resolutionExtensionIsTypeScriptOrJson;
-    /**
-     * Gets the extension from a path.
-     * Path must have a valid extension.
-     */
-    function extensionFromPath(path) {
-        var ext = tryGetExtensionFromPath(path);
-        return ext !== undefined ? ext : Debug.fail("File " + path + " has unknown extension.");
-    }
-    ts.extensionFromPath = extensionFromPath;
-    function isAnySupportedFileExtension(path) {
-        return tryGetExtensionFromPath(path) !== undefined;
-    }
-    ts.isAnySupportedFileExtension = isAnySupportedFileExtension;
-    function tryGetExtensionFromPath(path) {
-        return find(ts.supportedTypescriptExtensionsForExtractExtension, function (e) { return fileExtensionIs(path, e); }) || find(ts.supportedJavascriptExtensions, function (e) { return fileExtensionIs(path, e); });
-    }
-    ts.tryGetExtensionFromPath = tryGetExtensionFromPath;
-    function getAnyExtensionFromPathWorker(path, extensions, stringEqualityComparer) {
-        if (typeof extensions === "string")
-            extensions = [extensions];
-        for (var _i = 0, extensions_2 = extensions; _i < extensions_2.length; _i++) {
-            var extension = extensions_2[_i];
-            if (!startsWith(extension, "."))
-                extension = "." + extension;
-            if (path.length >= extension.length && path.charAt(path.length - extension.length) === ".") {
-                var pathExtension = path.slice(path.length - extension.length);
-                if (stringEqualityComparer(pathExtension, extension)) {
-                    return pathExtension;
-                }
-            }
-        }
-        return "";
-    }
-    function getAnyExtensionFromPath(path, extensions, ignoreCase) {
-        // Retrieves any string from the final "." onwards from a base file name.
-        // Unlike extensionFromPath, which throws an exception on unrecognized extensions.
-        if (extensions) {
-            return getAnyExtensionFromPathWorker(path, extensions, ignoreCase ? equateStringsCaseInsensitive : equateStringsCaseSensitive);
-        }
-        var baseFileName = getBaseFileName(path);
-        var extensionIndex = baseFileName.lastIndexOf(".");
-        if (extensionIndex >= 0) {
-            return baseFileName.substring(extensionIndex);
-        }
-        return "";
-    }
-    ts.getAnyExtensionFromPath = getAnyExtensionFromPath;
-    function isCheckJsEnabledForFile(sourceFile, compilerOptions) {
-        return sourceFile.checkJsDirective ? sourceFile.checkJsDirective.enabled : compilerOptions.checkJs;
-    }
-    ts.isCheckJsEnabledForFile = isCheckJsEnabledForFile;
-    function and(f, g) {
-        return function (arg) { return f(arg) && g(arg); };
-    }
-    ts.and = and;
-    function or(f, g) {
-        return function (arg) { return f(arg) || g(arg); };
-    }
-    ts.or = or;
-    function assertTypeIsNever(_) { } // tslint:disable-line no-empty
-    ts.assertTypeIsNever = assertTypeIsNever;
-    ts.emptyFileSystemEntries = {
-        files: ts.emptyArray,
-        directories: ts.emptyArray
-    };
-    function singleElementArray(t) {
-        return t === undefined ? undefined : [t];
-    }
-    ts.singleElementArray = singleElementArray;
-    function enumerateInsertsAndDeletes(newItems, oldItems, comparer, inserted, deleted, unchanged) {
-        unchanged = unchanged || noop;
-        var newIndex = 0;
-        var oldIndex = 0;
-        var newLen = newItems.length;
-        var oldLen = oldItems.length;
-        while (newIndex < newLen && oldIndex < oldLen) {
-            var newItem = newItems[newIndex];
-            var oldItem = oldItems[oldIndex];
-            var compareResult = comparer(newItem, oldItem);
-            if (compareResult === -1 /* LessThan */) {
-                inserted(newItem);
-                newIndex++;
-            }
-            else if (compareResult === 1 /* GreaterThan */) {
-                deleted(oldItem);
-                oldIndex++;
-            }
-            else {
-                unchanged(oldItem, newItem);
-                newIndex++;
-                oldIndex++;
-            }
-        }
-        while (newIndex < newLen) {
-            inserted(newItems[newIndex++]);
-        }
-        while (oldIndex < oldLen) {
-            deleted(oldItems[oldIndex++]);
-        }
-    }
-    ts.enumerateInsertsAndDeletes = enumerateInsertsAndDeletes;
-})(ts || (ts = {}));
 var ts;
 (function (ts) {
     /**
@@ -5166,6 +3893,8 @@ var ts;
                 },
                 readDirectory: readDirectory,
                 getModifiedTime: getModifiedTime,
+                setModifiedTime: setModifiedTime,
+                deleteFile: deleteFile,
                 createHash: _crypto ? createMD5HashUsingNativeCrypto : generateDjb2Hash,
                 createSHA256Hash: _crypto ? createSHA256Hash : undefined,
                 getMemoryUsage: function () {
@@ -5595,6 +4324,22 @@ var ts;
                     return undefined;
                 }
             }
+            function setModifiedTime(path, time) {
+                try {
+                    _fs.utimesSync(path, time, time);
+                }
+                catch (e) {
+                    return;
+                }
+            }
+            function deleteFile(path) {
+                try {
+                    return _fs.unlinkSync(path);
+                }
+                catch (e) {
+                    return;
+                }
+            }
             /**
              * djb2 hashing algorithm
              * http://www.cse.yorku.ca/~oz/hash.html
@@ -5691,7 +4436,7 @@ var ts;
     }
 })(ts || (ts = {}));
 // <auto-generated />
-// generated from './diagnosticInformationMap.generated.ts' by '../../scripts/processDiagnosticMessages.js'
+// generated from './diagnosticInformationMap.generated.ts' by 'src\parser'
 /* @internal */
 var ts;
 (function (ts) {
@@ -6292,6 +5037,8 @@ var ts;
         Cannot_invoke_an_object_which_is_possibly_null_or_undefined: diag(2723, ts.DiagnosticCategory.Error, "Cannot_invoke_an_object_which_is_possibly_null_or_undefined_2723", "Cannot invoke an object which is possibly 'null' or 'undefined'."),
         Module_0_has_no_exported_member_1_Did_you_mean_2: diag(2724, ts.DiagnosticCategory.Error, "Module_0_has_no_exported_member_1_Did_you_mean_2_2724", "Module '{0}' has no exported member '{1}'. Did you mean '{2}'?"),
         Class_name_cannot_be_Object_when_targeting_ES5_with_module_0: diag(2725, ts.DiagnosticCategory.Error, "Class_name_cannot_be_Object_when_targeting_ES5_with_module_0_2725", "Class name cannot be 'Object' when targeting ES5 with module {0}."),
+        Cannot_find_lib_definition_for_0: diag(2726, ts.DiagnosticCategory.Error, "Cannot_find_lib_definition_for_0_2726", "Cannot find lib definition for '{0}'."),
+        Cannot_find_lib_definition_for_0_Did_you_mean_1: diag(2727, ts.DiagnosticCategory.Error, "Cannot_find_lib_definition_for_0_Did_you_mean_1_2727", "Cannot find lib definition for '{0}'. Did you mean '{1}'?"),
         Import_declaration_0_is_using_private_name_1: diag(4000, ts.DiagnosticCategory.Error, "Import_declaration_0_is_using_private_name_1_4000", "Import declaration '{0}' is using private name '{1}'."),
         Type_parameter_0_of_exported_class_has_or_is_using_private_name_1: diag(4002, ts.DiagnosticCategory.Error, "Type_parameter_0_of_exported_class_has_or_is_using_private_name_1_4002", "Type parameter '{0}' of exported class has or is using private name '{1}'."),
         Type_parameter_0_of_exported_interface_has_or_is_using_private_name_1: diag(4004, ts.DiagnosticCategory.Error, "Type_parameter_0_of_exported_interface_has_or_is_using_private_name_1_4004", "Type parameter '{0}' of exported interface has or is using private name '{1}'."),
@@ -6600,6 +5347,28 @@ var ts;
         File_0_is_not_in_project_file_list_Projects_must_list_all_files_or_use_an_include_pattern: diag(6307, ts.DiagnosticCategory.Error, "File_0_is_not_in_project_file_list_Projects_must_list_all_files_or_use_an_include_pattern_6307", "File '{0}' is not in project file list. Projects must list all files or use an 'include' pattern."),
         Cannot_prepend_project_0_because_it_does_not_have_outFile_set: diag(6308, ts.DiagnosticCategory.Error, "Cannot_prepend_project_0_because_it_does_not_have_outFile_set_6308", "Cannot prepend project '{0}' because it does not have 'outFile' set"),
         Output_file_0_from_project_1_does_not_exist: diag(6309, ts.DiagnosticCategory.Error, "Output_file_0_from_project_1_does_not_exist_6309", "Output file '{0}' from project '{1}' does not exist"),
+        Project_0_is_out_of_date_because_oldest_output_1_is_older_than_newest_input_2: diag(6350, ts.DiagnosticCategory.Message, "Project_0_is_out_of_date_because_oldest_output_1_is_older_than_newest_input_2_6350", "Project '{0}' is out of date because oldest output '{1}' is older than newest input '{2}'"),
+        Project_0_is_up_to_date_because_newest_input_1_is_older_than_oldest_output_2: diag(6351, ts.DiagnosticCategory.Message, "Project_0_is_up_to_date_because_newest_input_1_is_older_than_oldest_output_2_6351", "Project '{0}' is up to date because newest input '{1}' is older than oldest output '{2}'"),
+        Project_0_is_out_of_date_because_output_file_1_does_not_exist: diag(6352, ts.DiagnosticCategory.Message, "Project_0_is_out_of_date_because_output_file_1_does_not_exist_6352", "Project '{0}' is out of date because output file '{1}' does not exist"),
+        Project_0_is_out_of_date_because_its_dependency_1_is_out_of_date: diag(6353, ts.DiagnosticCategory.Message, "Project_0_is_out_of_date_because_its_dependency_1_is_out_of_date_6353", "Project '{0}' is out of date because its dependency '{1}' is out of date"),
+        Project_0_is_up_to_date_with_d_ts_files_from_its_dependencies: diag(6354, ts.DiagnosticCategory.Message, "Project_0_is_up_to_date_with_d_ts_files_from_its_dependencies_6354", "Project '{0}' is up to date with .d.ts files from its dependencies"),
+        Projects_in_this_build_Colon_0: diag(6355, ts.DiagnosticCategory.Message, "Projects_in_this_build_Colon_0_6355", "Projects in this build: {0}"),
+        A_non_dry_build_would_delete_the_following_files_Colon_0: diag(6356, ts.DiagnosticCategory.Message, "A_non_dry_build_would_delete_the_following_files_Colon_0_6356", "A non-dry build would delete the following files: {0}"),
+        A_non_dry_build_would_build_project_0: diag(6357, ts.DiagnosticCategory.Message, "A_non_dry_build_would_build_project_0_6357", "A non-dry build would build project '{0}'"),
+        Building_project_0: diag(6358, ts.DiagnosticCategory.Message, "Building_project_0_6358", "Building project '{0}'..."),
+        Updating_output_timestamps_of_project_0: diag(6359, ts.DiagnosticCategory.Message, "Updating_output_timestamps_of_project_0_6359", "Updating output timestamps of project '{0}'..."),
+        delete_this_Project_0_is_up_to_date_because_it_was_previously_built: diag(6360, ts.DiagnosticCategory.Message, "delete_this_Project_0_is_up_to_date_because_it_was_previously_built_6360", "delete this - Project '{0}' is up to date because it was previously built"),
+        Project_0_is_up_to_date: diag(6361, ts.DiagnosticCategory.Message, "Project_0_is_up_to_date_6361", "Project '{0}' is up to date"),
+        Skipping_build_of_project_0_because_its_dependency_1_has_errors: diag(6362, ts.DiagnosticCategory.Message, "Skipping_build_of_project_0_because_its_dependency_1_has_errors_6362", "Skipping build of project '{0}' because its dependency '{1}' has errors"),
+        Project_0_can_t_be_built_because_its_dependency_1_has_errors: diag(6363, ts.DiagnosticCategory.Message, "Project_0_can_t_be_built_because_its_dependency_1_has_errors_6363", "Project '{0}' can't be built because its dependency '{1}' has errors"),
+        Build_one_or_more_projects_and_their_dependencies_if_out_of_date: diag(6364, ts.DiagnosticCategory.Message, "Build_one_or_more_projects_and_their_dependencies_if_out_of_date_6364", "Build one or more projects and their dependencies, if out of date"),
+        Delete_the_outputs_of_all_projects: diag(6365, ts.DiagnosticCategory.Message, "Delete_the_outputs_of_all_projects_6365", "Delete the outputs of all projects"),
+        Enable_verbose_logging: diag(6366, ts.DiagnosticCategory.Message, "Enable_verbose_logging_6366", "Enable verbose logging"),
+        Show_what_would_be_built_or_deleted_if_specified_with_clean: diag(6367, ts.DiagnosticCategory.Message, "Show_what_would_be_built_or_deleted_if_specified_with_clean_6367", "Show what would be built (or deleted, if specified with '--clean')"),
+        Build_all_projects_including_those_that_appear_to_be_up_to_date: diag(6368, ts.DiagnosticCategory.Message, "Build_all_projects_including_those_that_appear_to_be_up_to_date_6368", "Build all projects, including those that appear to be up to date"),
+        Option_build_must_be_the_first_command_line_argument: diag(6369, ts.DiagnosticCategory.Error, "Option_build_must_be_the_first_command_line_argument_6369", "Option '--build' must be the first command line argument."),
+        Options_0_and_1_cannot_be_combined: diag(6370, ts.DiagnosticCategory.Error, "Options_0_and_1_cannot_be_combined_6370", "Options '{0}' and '{1}' cannot be combined."),
+        Skipping_clean_because_not_all_projects_could_be_located: diag(6371, ts.DiagnosticCategory.Error, "Skipping_clean_because_not_all_projects_could_be_located_6371", "Skipping clean because not all projects could be located"),
         Variable_0_implicitly_has_an_1_type: diag(7005, ts.DiagnosticCategory.Error, "Variable_0_implicitly_has_an_1_type_7005", "Variable '{0}' implicitly has an '{1}' type."),
         Parameter_0_implicitly_has_an_1_type: diag(7006, ts.DiagnosticCategory.Error, "Parameter_0_implicitly_has_an_1_type_7006", "Parameter '{0}' implicitly has an '{1}' type."),
         Member_0_implicitly_has_an_1_type: diag(7008, ts.DiagnosticCategory.Error, "Member_0_implicitly_has_an_1_type_7008", "Member '{0}' implicitly has an '{1}' type."),
@@ -8655,8 +7424,38 @@ var ts;
     }
     ts.createScanner = createScanner;
 })(ts || (ts = {}));
-/* @internal */
+/** Non-internal stuff goes here */
 var ts;
+(function (ts) {
+    ts.emptyArray = [];
+    function closeFileWatcher(watcher) {
+        watcher.close();
+    }
+    ts.closeFileWatcher = closeFileWatcher;
+    function isExternalModuleNameRelative(moduleName) {
+        // TypeScript 1.0 spec (April 2014): 11.2.1
+        // An external module name is "relative" if the first term is "." or "..".
+        // Update: We also consider a path like `C:\foo.ts` "relative" because we do not search for it in `node_modules` or treat it as an ambient module.
+        return ts.pathIsRelative(moduleName) || ts.isRootedDiskPath(moduleName);
+    }
+    ts.isExternalModuleNameRelative = isExternalModuleNameRelative;
+    function sortAndDeduplicateDiagnostics(diagnostics) {
+        return ts.sortAndDeduplicate(diagnostics, ts.compareDiagnostics);
+    }
+    ts.sortAndDeduplicateDiagnostics = sortAndDeduplicateDiagnostics;
+    function toPath(fileName, basePath, getCanonicalFileName) {
+        var nonCanonicalizedPath = ts.isRootedDiskPath(fileName)
+            ? ts.normalizePath(fileName)
+            : ts.getNormalizedAbsolutePath(fileName, basePath);
+        return getCanonicalFileName(nonCanonicalizedPath);
+    }
+    ts.toPath = toPath;
+    function hasEntries(map) {
+        return !!map && !!map.size;
+    }
+    ts.hasEntries = hasEntries;
+})(ts || (ts = {}));
+/* @internal */
 (function (ts) {
     ts.resolvingEmptyArray = [];
     ts.emptyMap = ts.createMap();
@@ -8675,6 +7474,22 @@ var ts;
         return undefined;
     }
     ts.getDeclarationOfKind = getDeclarationOfKind;
+    /** Create a new escaped identifier map. */
+    function createUnderscoreEscapedMap() {
+        return new ts.MapCtr();
+    }
+    ts.createUnderscoreEscapedMap = createUnderscoreEscapedMap;
+    function createSymbolTable(symbols) {
+        var result = ts.createMap();
+        if (symbols) {
+            for (var _i = 0, symbols_1 = symbols; _i < symbols_1.length; _i++) {
+                var symbol = symbols_1[_i];
+                result.set(symbol.escapedName, symbol);
+            }
+        }
+        return result;
+    }
+    ts.createSymbolTable = createSymbolTable;
     var stringWriter = createSingleLineStringWriter();
     function createSingleLineStringWriter() {
         var str = "";
@@ -8710,6 +7525,80 @@ var ts;
             reportPrivateInBaseOfClassExpression: ts.noop,
         };
     }
+    function changesAffectModuleResolution(oldOptions, newOptions) {
+        return !oldOptions ||
+            (oldOptions.module !== newOptions.module) ||
+            (oldOptions.moduleResolution !== newOptions.moduleResolution) ||
+            (oldOptions.noResolve !== newOptions.noResolve) ||
+            (oldOptions.target !== newOptions.target) ||
+            (oldOptions.noLib !== newOptions.noLib) ||
+            (oldOptions.jsx !== newOptions.jsx) ||
+            (oldOptions.allowJs !== newOptions.allowJs) ||
+            (oldOptions.rootDir !== newOptions.rootDir) ||
+            (oldOptions.configFilePath !== newOptions.configFilePath) ||
+            (oldOptions.baseUrl !== newOptions.baseUrl) ||
+            (oldOptions.maxNodeModuleJsDepth !== newOptions.maxNodeModuleJsDepth) ||
+            !ts.arrayIsEqualTo(oldOptions.lib, newOptions.lib) ||
+            !ts.arrayIsEqualTo(oldOptions.typeRoots, newOptions.typeRoots) ||
+            !ts.arrayIsEqualTo(oldOptions.rootDirs, newOptions.rootDirs) ||
+            !ts.equalOwnProperties(oldOptions.paths, newOptions.paths);
+    }
+    ts.changesAffectModuleResolution = changesAffectModuleResolution;
+    function findAncestor(node, callback) {
+        while (node) {
+            var result = callback(node);
+            if (result === "quit") {
+                return undefined;
+            }
+            else if (result) {
+                return node;
+            }
+            node = node.parent;
+        }
+        return undefined;
+    }
+    ts.findAncestor = findAncestor;
+    function forEachEntry(map, callback) {
+        var _a;
+        var iterator = map.entries();
+        for (var _b = iterator.next(), pair = _b.value, done = _b.done; !done; _a = iterator.next(), pair = _a.value, done = _a.done, _a) {
+            var key = pair[0], value = pair[1];
+            var result = callback(value, key);
+            if (result) {
+                return result;
+            }
+        }
+        return undefined;
+    }
+    ts.forEachEntry = forEachEntry;
+    function forEachKey(map, callback) {
+        var _a;
+        var iterator = map.keys();
+        for (var _b = iterator.next(), key = _b.value, done = _b.done; !done; _a = iterator.next(), key = _a.value, done = _a.done, _a) {
+            var result = callback(key);
+            if (result) {
+                return result;
+            }
+        }
+        return undefined;
+    }
+    ts.forEachKey = forEachKey;
+    function copyEntries(source, target) {
+        source.forEach(function (value, key) {
+            target.set(key, value);
+        });
+    }
+    ts.copyEntries = copyEntries;
+    function arrayToSet(array, makeKey) {
+        return ts.arrayToMap(array, makeKey || (function (s) { return s; }), function () { return true; });
+    }
+    ts.arrayToSet = arrayToSet;
+    function cloneMap(map) {
+        var clone = ts.createMap();
+        copyEntries(map, clone);
+        return clone;
+    }
+    ts.cloneMap = cloneMap;
     function usingSingleLineStringWriter(action) {
         var oldString = stringWriter.getText();
         try {
@@ -9083,6 +7972,16 @@ var ts;
         return ts.isModuleDeclaration(node) && ts.isStringLiteral(node.name);
     }
     ts.isNonGlobalAmbientModule = isNonGlobalAmbientModule;
+    /**
+     * An effective module (namespace) declaration is either
+     * 1. An actual declaration: namespace X { ... }
+     * 2. A Javascript declaration, which is:
+     *    An identifier in a nested property access expression: Y in `X.Y.Z = { ... }`
+     */
+    function isEffectiveModuleDeclaration(node) {
+        return ts.isModuleDeclaration(node) || ts.isIdentifier(node);
+    }
+    ts.isEffectiveModuleDeclaration = isEffectiveModuleDeclaration;
     /** Given a symbol for a module, checks that it is a shorthand ambient module. */
     function isShorthandAmbientModuleSymbol(moduleSymbol) {
         return isShorthandAmbientModule(moduleSymbol.valueDeclaration);
@@ -9213,7 +8112,7 @@ var ts;
     // Gets the nearest enclosing block scope container that has the provided node
     // as a descendant, that is not the provided node.
     function getEnclosingBlockScopeContainer(node) {
-        return ts.findAncestor(node.parent, function (current) { return isBlockScope(current, current.parent); });
+        return findAncestor(node.parent, function (current) { return isBlockScope(current, current.parent); });
     }
     ts.getEnclosingBlockScopeContainer = getEnclosingBlockScopeContainer;
     // Return display name of an identifier
@@ -9727,11 +8626,11 @@ var ts;
     }
     ts.getTsConfigPropArray = getTsConfigPropArray;
     function getContainingFunction(node) {
-        return ts.findAncestor(node.parent, ts.isFunctionLike);
+        return findAncestor(node.parent, ts.isFunctionLike);
     }
     ts.getContainingFunction = getContainingFunction;
     function getContainingClass(node) {
-        return ts.findAncestor(node.parent, ts.isClassLike);
+        return findAncestor(node.parent, ts.isClassLike);
     }
     ts.getContainingClass = getContainingClass;
     function getThisContainer(node, includeArrowFunctions) {
@@ -10555,7 +9454,7 @@ var ts;
     }
     ts.getHostSignatureFromJSDocHost = getHostSignatureFromJSDocHost;
     function getJSDocHost(node) {
-        return ts.Debug.assertDefined(ts.findAncestor(node.parent, ts.isJSDoc)).parent;
+        return ts.Debug.assertDefined(findAncestor(node.parent, ts.isJSDoc)).parent;
     }
     ts.getJSDocHost = getJSDocHost;
     function getTypeParameterFromJsDoc(node) {
@@ -11355,13 +10254,25 @@ var ts;
         var lineStart;
         var lineCount;
         var linePos;
+        function updateLineCountAndPosFor(s) {
+            var lineStartsOfS = ts.computeLineStarts(s);
+            if (lineStartsOfS.length > 1) {
+                lineCount = lineCount + lineStartsOfS.length - 1;
+                linePos = output.length - s.length + ts.last(lineStartsOfS);
+                lineStart = (linePos - output.length) === 0;
+            }
+            else {
+                lineStart = false;
+            }
+        }
         function write(s) {
             if (s && s.length) {
                 if (lineStart) {
-                    output += getIndentString(indent);
+                    s = getIndentString(indent) + s;
                     lineStart = false;
                 }
                 output += s;
+                updateLineCountAndPosFor(s);
             }
         }
         function reset() {
@@ -11373,20 +10284,13 @@ var ts;
         }
         function rawWrite(s) {
             if (s !== undefined) {
-                if (lineStart) {
-                    lineStart = false;
-                }
                 output += s;
+                updateLineCountAndPosFor(s);
             }
         }
         function writeLiteral(s) {
             if (s && s.length) {
                 write(s);
-                var lineStartsOfS = ts.computeLineStarts(s);
-                if (lineStartsOfS.length > 1) {
-                    lineCount = lineCount + lineStartsOfS.length - 1;
-                    linePos = output.length - s.length + ts.last(lineStartsOfS);
-                }
             }
         }
         function writeLine() {
@@ -11398,7 +10302,9 @@ var ts;
             }
         }
         function writeTextOfNode(text, node) {
-            write(getTextOfNodeFromSourceText(text, node));
+            var s = getTextOfNodeFromSourceText(text, node);
+            write(s);
+            updateLineCountAndPosFor(s);
         }
         reset();
         return {
@@ -13810,6 +12716,10 @@ var ts;
         return node.kind === 275 /* Bundle */;
     }
     ts.isBundle = isBundle;
+    function isUnparsedSource(node) {
+        return node.kind === 276 /* UnparsedSource */;
+    }
+    ts.isUnparsedSource = isUnparsedSource;
     // JSDoc
     function isJSDocTypeExpression(node) {
         return node.kind === 278 /* JSDocTypeExpression */;
@@ -14779,6 +13689,1230 @@ var ts;
         return node.kind === 247 /* NamedImports */ || node.kind === 251 /* NamedExports */;
     }
     ts.isNamedImportsOrExports = isNamedImportsOrExports;
+    function Symbol(flags, name) {
+        this.flags = flags;
+        this.escapedName = name;
+        this.declarations = undefined;
+        this.valueDeclaration = undefined;
+        this.id = undefined;
+        this.mergeId = undefined;
+        this.parent = undefined;
+    }
+    function Type(checker, flags) {
+        this.flags = flags;
+        if (Debug.isDebugging) {
+            this.checker = checker;
+        }
+    }
+    function Signature() { } // tslint:disable-line no-empty
+    function Node(kind, pos, end) {
+        this.pos = pos;
+        this.end = end;
+        this.kind = kind;
+        this.id = 0;
+        this.flags = 0 /* None */;
+        this.modifierFlagsCache = 0 /* None */;
+        this.transformFlags = 0 /* None */;
+        this.parent = undefined;
+        this.original = undefined;
+    }
+    function SourceMapSource(fileName, text, skipTrivia) {
+        this.fileName = fileName;
+        this.text = text;
+        this.skipTrivia = skipTrivia || (function (pos) { return pos; });
+    }
+    ts.objectAllocator = {
+        getNodeConstructor: function () { return Node; },
+        getTokenConstructor: function () { return Node; },
+        getIdentifierConstructor: function () { return Node; },
+        getSourceFileConstructor: function () { return Node; },
+        getSymbolConstructor: function () { return Symbol; },
+        getTypeConstructor: function () { return Type; },
+        getSignatureConstructor: function () { return Signature; },
+        getSourceMapSourceConstructor: function () { return SourceMapSource; },
+    };
+    function formatStringFromArgs(text, args, baseIndex) {
+        if (baseIndex === void 0) { baseIndex = 0; }
+        return text.replace(/{(\d+)}/g, function (_match, index) { return Debug.assertDefined(args[+index + baseIndex]); });
+    }
+    ts.formatStringFromArgs = formatStringFromArgs;
+    function getLocaleSpecificMessage(message) {
+        return ts.localizedDiagnosticMessages && ts.localizedDiagnosticMessages[message.key] || message.message;
+    }
+    ts.getLocaleSpecificMessage = getLocaleSpecificMessage;
+    function createFileDiagnostic(file, start, length, message) {
+        Debug.assertGreaterThanOrEqual(start, 0);
+        Debug.assertGreaterThanOrEqual(length, 0);
+        if (file) {
+            Debug.assertLessThanOrEqual(start, file.text.length);
+            Debug.assertLessThanOrEqual(start + length, file.text.length);
+        }
+        var text = getLocaleSpecificMessage(message);
+        if (arguments.length > 4) {
+            text = formatStringFromArgs(text, arguments, 4);
+        }
+        return {
+            file: file,
+            start: start,
+            length: length,
+            messageText: text,
+            category: message.category,
+            code: message.code,
+            reportsUnnecessary: message.reportsUnnecessary,
+        };
+    }
+    ts.createFileDiagnostic = createFileDiagnostic;
+    /* @internal */
+    function formatMessage(_dummy, message) {
+        var text = getLocaleSpecificMessage(message);
+        if (arguments.length > 2) {
+            text = formatStringFromArgs(text, arguments, 2);
+        }
+        return text;
+    }
+    ts.formatMessage = formatMessage;
+    function createCompilerDiagnostic(message) {
+        var text = getLocaleSpecificMessage(message);
+        if (arguments.length > 1) {
+            text = formatStringFromArgs(text, arguments, 1);
+        }
+        return {
+            file: undefined,
+            start: undefined,
+            length: undefined,
+            messageText: text,
+            category: message.category,
+            code: message.code,
+            reportsUnnecessary: message.reportsUnnecessary,
+        };
+    }
+    ts.createCompilerDiagnostic = createCompilerDiagnostic;
+    function createCompilerDiagnosticFromMessageChain(chain) {
+        return {
+            file: undefined,
+            start: undefined,
+            length: undefined,
+            code: chain.code,
+            category: chain.category,
+            messageText: chain.next ? chain : chain.messageText,
+        };
+    }
+    ts.createCompilerDiagnosticFromMessageChain = createCompilerDiagnosticFromMessageChain;
+    function chainDiagnosticMessages(details, message) {
+        var text = getLocaleSpecificMessage(message);
+        if (arguments.length > 2) {
+            text = formatStringFromArgs(text, arguments, 2);
+        }
+        return {
+            messageText: text,
+            category: message.category,
+            code: message.code,
+            next: details
+        };
+    }
+    ts.chainDiagnosticMessages = chainDiagnosticMessages;
+    function concatenateDiagnosticMessageChains(headChain, tailChain) {
+        var lastChain = headChain;
+        while (lastChain.next) {
+            lastChain = lastChain.next;
+        }
+        lastChain.next = tailChain;
+        return headChain;
+    }
+    ts.concatenateDiagnosticMessageChains = concatenateDiagnosticMessageChains;
+    function getDiagnosticFilePath(diagnostic) {
+        return diagnostic.file ? diagnostic.file.path : undefined;
+    }
+    function compareDiagnostics(d1, d2) {
+        return ts.compareStringsCaseSensitive(getDiagnosticFilePath(d1), getDiagnosticFilePath(d2)) ||
+            ts.compareValues(d1.start, d2.start) ||
+            ts.compareValues(d1.length, d2.length) ||
+            ts.compareValues(d1.code, d2.code) ||
+            compareMessageText(d1.messageText, d2.messageText) ||
+            0 /* EqualTo */;
+    }
+    ts.compareDiagnostics = compareDiagnostics;
+    function compareMessageText(t1, t2) {
+        var text1 = t1;
+        var text2 = t2;
+        while (text1 && text2) {
+            // We still have both chains.
+            var string1 = ts.isString(text1) ? text1 : text1.messageText;
+            var string2 = ts.isString(text2) ? text2 : text2.messageText;
+            var res = ts.compareStringsCaseSensitive(string1, string2);
+            if (res) {
+                return res;
+            }
+            text1 = ts.isString(text1) ? undefined : text1.next;
+            text2 = ts.isString(text2) ? undefined : text2.next;
+        }
+        if (!text1 && !text2) {
+            // if the chains are done, then these messages are the same.
+            return 0 /* EqualTo */;
+        }
+        // We still have one chain remaining.  The shorter chain should come first.
+        return text1 ? 1 /* GreaterThan */ : -1 /* LessThan */;
+    }
+    function getEmitScriptTarget(compilerOptions) {
+        return compilerOptions.target || 0 /* ES3 */;
+    }
+    ts.getEmitScriptTarget = getEmitScriptTarget;
+    function getEmitModuleKind(compilerOptions) {
+        return typeof compilerOptions.module === "number" ?
+            compilerOptions.module :
+            getEmitScriptTarget(compilerOptions) >= 2 /* ES2015 */ ? ts.ModuleKind.ES2015 : ts.ModuleKind.CommonJS;
+    }
+    ts.getEmitModuleKind = getEmitModuleKind;
+    function getEmitModuleResolutionKind(compilerOptions) {
+        var moduleResolution = compilerOptions.moduleResolution;
+        if (moduleResolution === undefined) {
+            moduleResolution = getEmitModuleKind(compilerOptions) === ts.ModuleKind.CommonJS ? ts.ModuleResolutionKind.NodeJs : ts.ModuleResolutionKind.Classic;
+        }
+        return moduleResolution;
+    }
+    ts.getEmitModuleResolutionKind = getEmitModuleResolutionKind;
+    function unreachableCodeIsError(options) {
+        return options.allowUnreachableCode === false;
+    }
+    ts.unreachableCodeIsError = unreachableCodeIsError;
+    function unusedLabelIsError(options) {
+        return options.allowUnusedLabels === false;
+    }
+    ts.unusedLabelIsError = unusedLabelIsError;
+    function getAreDeclarationMapsEnabled(options) {
+        return !!(options.declaration && options.declarationMap);
+    }
+    ts.getAreDeclarationMapsEnabled = getAreDeclarationMapsEnabled;
+    function getAllowSyntheticDefaultImports(compilerOptions) {
+        var moduleKind = getEmitModuleKind(compilerOptions);
+        return compilerOptions.allowSyntheticDefaultImports !== undefined
+            ? compilerOptions.allowSyntheticDefaultImports
+            : compilerOptions.esModuleInterop
+                ? moduleKind !== ts.ModuleKind.None && moduleKind < ts.ModuleKind.ES2015
+                : moduleKind === ts.ModuleKind.System;
+    }
+    ts.getAllowSyntheticDefaultImports = getAllowSyntheticDefaultImports;
+    function getEmitDeclarations(compilerOptions) {
+        return !!(compilerOptions.declaration || compilerOptions.composite);
+    }
+    ts.getEmitDeclarations = getEmitDeclarations;
+    function getStrictOptionValue(compilerOptions, flag) {
+        return compilerOptions[flag] === undefined ? !!compilerOptions.strict : !!compilerOptions[flag];
+    }
+    ts.getStrictOptionValue = getStrictOptionValue;
+    function hasZeroOrOneAsteriskCharacter(str) {
+        var seenAsterisk = false;
+        for (var i = 0; i < str.length; i++) {
+            if (str.charCodeAt(i) === 42 /* asterisk */) {
+                if (!seenAsterisk) {
+                    seenAsterisk = true;
+                }
+                else {
+                    // have already seen asterisk
+                    return false;
+                }
+            }
+        }
+        return true;
+    }
+    ts.hasZeroOrOneAsteriskCharacter = hasZeroOrOneAsteriskCharacter;
+    /**
+     * Internally, we represent paths as strings with '/' as the directory separator.
+     * When we make system calls (eg: LanguageServiceHost.getDirectory()),
+     * we expect the host to correctly handle paths in our specified format.
+     */
+    ts.directorySeparator = "/";
+    var altDirectorySeparator = "\\";
+    var urlSchemeSeparator = "://";
+    var backslashRegExp = /\\/g;
+    /**
+     * Normalize path separators.
+     */
+    function normalizeSlashes(path) {
+        return path.replace(backslashRegExp, ts.directorySeparator);
+    }
+    ts.normalizeSlashes = normalizeSlashes;
+    function isVolumeCharacter(charCode) {
+        return (charCode >= 97 /* a */ && charCode <= 122 /* z */) ||
+            (charCode >= 65 /* A */ && charCode <= 90 /* Z */);
+    }
+    function getFileUrlVolumeSeparatorEnd(url, start) {
+        var ch0 = url.charCodeAt(start);
+        if (ch0 === 58 /* colon */)
+            return start + 1;
+        if (ch0 === 37 /* percent */ && url.charCodeAt(start + 1) === 51 /* _3 */) {
+            var ch2 = url.charCodeAt(start + 2);
+            if (ch2 === 97 /* a */ || ch2 === 65 /* A */)
+                return start + 3;
+        }
+        return -1;
+    }
+    /**
+     * Returns length of the root part of a path or URL (i.e. length of "/", "x:/", "//server/share/, file:///user/files").
+     * If the root is part of a URL, the twos-complement of the root length is returned.
+     */
+    function getEncodedRootLength(path) {
+        if (!path)
+            return 0;
+        var ch0 = path.charCodeAt(0);
+        // POSIX or UNC
+        if (ch0 === 47 /* slash */ || ch0 === 92 /* backslash */) {
+            if (path.charCodeAt(1) !== ch0)
+                return 1; // POSIX: "/" (or non-normalized "\")
+            var p1 = path.indexOf(ch0 === 47 /* slash */ ? ts.directorySeparator : altDirectorySeparator, 2);
+            if (p1 < 0)
+                return path.length; // UNC: "//server" or "\\server"
+            return p1 + 1; // UNC: "//server/" or "\\server\"
+        }
+        // DOS
+        if (isVolumeCharacter(ch0) && path.charCodeAt(1) === 58 /* colon */) {
+            var ch2 = path.charCodeAt(2);
+            if (ch2 === 47 /* slash */ || ch2 === 92 /* backslash */)
+                return 3; // DOS: "c:/" or "c:\"
+            if (path.length === 2)
+                return 2; // DOS: "c:" (but not "c:d")
+        }
+        // URL
+        var schemeEnd = path.indexOf(urlSchemeSeparator);
+        if (schemeEnd !== -1) {
+            var authorityStart = schemeEnd + urlSchemeSeparator.length;
+            var authorityEnd = path.indexOf(ts.directorySeparator, authorityStart);
+            if (authorityEnd !== -1) { // URL: "file:///", "file://server/", "file://server/path"
+                // For local "file" URLs, include the leading DOS volume (if present).
+                // Per https://www.ietf.org/rfc/rfc1738.txt, a host of "" or "localhost" is a
+                // special case interpreted as "the machine from which the URL is being interpreted".
+                var scheme = path.slice(0, schemeEnd);
+                var authority = path.slice(authorityStart, authorityEnd);
+                if (scheme === "file" && (authority === "" || authority === "localhost") &&
+                    isVolumeCharacter(path.charCodeAt(authorityEnd + 1))) {
+                    var volumeSeparatorEnd = getFileUrlVolumeSeparatorEnd(path, authorityEnd + 2);
+                    if (volumeSeparatorEnd !== -1) {
+                        if (path.charCodeAt(volumeSeparatorEnd) === 47 /* slash */) {
+                            // URL: "file:///c:/", "file://localhost/c:/", "file:///c%3a/", "file://localhost/c%3a/"
+                            return ~(volumeSeparatorEnd + 1);
+                        }
+                        if (volumeSeparatorEnd === path.length) {
+                            // URL: "file:///c:", "file://localhost/c:", "file:///c$3a", "file://localhost/c%3a"
+                            // but not "file:///c:d" or "file:///c%3ad"
+                            return ~volumeSeparatorEnd;
+                        }
+                    }
+                }
+                return ~(authorityEnd + 1); // URL: "file://server/", "http://server/"
+            }
+            return ~path.length; // URL: "file://server", "http://server"
+        }
+        // relative
+        return 0;
+    }
+    /**
+     * Returns length of the root part of a path or URL (i.e. length of "/", "x:/", "//server/share/, file:///user/files").
+     *
+     * For example:
+     * ```ts
+     * getRootLength("a") === 0                   // ""
+     * getRootLength("/") === 1                   // "/"
+     * getRootLength("c:") === 2                  // "c:"
+     * getRootLength("c:d") === 0                 // ""
+     * getRootLength("c:/") === 3                 // "c:/"
+     * getRootLength("c:\\") === 3                // "c:\\"
+     * getRootLength("//server") === 7            // "//server"
+     * getRootLength("//server/share") === 8      // "//server/"
+     * getRootLength("\\\\server") === 7          // "\\\\server"
+     * getRootLength("\\\\server\\share") === 8   // "\\\\server\\"
+     * getRootLength("file:///path") === 8        // "file:///"
+     * getRootLength("file:///c:") === 10         // "file:///c:"
+     * getRootLength("file:///c:d") === 8         // "file:///"
+     * getRootLength("file:///c:/path") === 11    // "file:///c:/"
+     * getRootLength("file://server") === 13      // "file://server"
+     * getRootLength("file://server/path") === 14 // "file://server/"
+     * getRootLength("http://server") === 13      // "http://server"
+     * getRootLength("http://server/path") === 14 // "http://server/"
+     * ```
+     */
+    function getRootLength(path) {
+        var rootLength = getEncodedRootLength(path);
+        return rootLength < 0 ? ~rootLength : rootLength;
+    }
+    ts.getRootLength = getRootLength;
+    // TODO(rbuckton): replace references with `resolvePath`
+    function normalizePath(path) {
+        return resolvePath(path);
+    }
+    ts.normalizePath = normalizePath;
+    function normalizePathAndParts(path) {
+        path = normalizeSlashes(path);
+        var _a = reducePathComponents(getPathComponents(path)), root = _a[0], parts = _a.slice(1);
+        if (parts.length) {
+            var joinedParts = root + parts.join(ts.directorySeparator);
+            return { path: hasTrailingDirectorySeparator(path) ? ensureTrailingDirectorySeparator(joinedParts) : joinedParts, parts: parts };
+        }
+        else {
+            return { path: root, parts: parts };
+        }
+    }
+    ts.normalizePathAndParts = normalizePathAndParts;
+    function getDirectoryPath(path) {
+        path = normalizeSlashes(path);
+        // If the path provided is itself the root, then return it.
+        var rootLength = getRootLength(path);
+        if (rootLength === path.length)
+            return path;
+        // return the leading portion of the path up to the last (non-terminal) directory separator
+        // but not including any trailing directory separator.
+        path = removeTrailingDirectorySeparator(path);
+        return path.slice(0, Math.max(rootLength, path.lastIndexOf(ts.directorySeparator)));
+    }
+    ts.getDirectoryPath = getDirectoryPath;
+    function isUrl(path) {
+        return getEncodedRootLength(path) < 0;
+    }
+    ts.isUrl = isUrl;
+    function pathIsRelative(path) {
+        return /^\.\.?($|[\\/])/.test(path);
+    }
+    ts.pathIsRelative = pathIsRelative;
+    /**
+     * Determines whether a path is an absolute path (e.g. starts with `/`, or a dos path
+     * like `c:`, `c:\` or `c:/`).
+     */
+    function isRootedDiskPath(path) {
+        return getEncodedRootLength(path) > 0;
+    }
+    ts.isRootedDiskPath = isRootedDiskPath;
+    /**
+     * Determines whether a path consists only of a path root.
+     */
+    function isDiskPathRoot(path) {
+        var rootLength = getEncodedRootLength(path);
+        return rootLength > 0 && rootLength === path.length;
+    }
+    ts.isDiskPathRoot = isDiskPathRoot;
+    function convertToRelativePath(absoluteOrRelativePath, basePath, getCanonicalFileName) {
+        return !isRootedDiskPath(absoluteOrRelativePath)
+            ? absoluteOrRelativePath
+            : getRelativePathToDirectoryOrUrl(basePath, absoluteOrRelativePath, basePath, getCanonicalFileName, /*isAbsolutePathAnUrl*/ false);
+    }
+    ts.convertToRelativePath = convertToRelativePath;
+    function pathComponents(path, rootLength) {
+        var root = path.substring(0, rootLength);
+        var rest = path.substring(rootLength).split(ts.directorySeparator);
+        if (rest.length && !ts.lastOrUndefined(rest))
+            rest.pop();
+        return [root].concat(rest);
+    }
+    /**
+     * Parse a path into an array containing a root component (at index 0) and zero or more path
+     * components (at indices > 0). The result is not normalized.
+     * If the path is relative, the root component is `""`.
+     * If the path is absolute, the root component includes the first path separator (`/`).
+     */
+    function getPathComponents(path, currentDirectory) {
+        if (currentDirectory === void 0) { currentDirectory = ""; }
+        path = combinePaths(currentDirectory, path);
+        var rootLength = getRootLength(path);
+        return pathComponents(path, rootLength);
+    }
+    ts.getPathComponents = getPathComponents;
+    /**
+     * Reduce an array of path components to a more simplified path by navigating any
+     * `"."` or `".."` entries in the path.
+     */
+    function reducePathComponents(components) {
+        if (!ts.some(components))
+            return [];
+        var reduced = [components[0]];
+        for (var i = 1; i < components.length; i++) {
+            var component = components[i];
+            if (!component)
+                continue;
+            if (component === ".")
+                continue;
+            if (component === "..") {
+                if (reduced.length > 1) {
+                    if (reduced[reduced.length - 1] !== "..") {
+                        reduced.pop();
+                        continue;
+                    }
+                }
+                else if (reduced[0])
+                    continue;
+            }
+            reduced.push(component);
+        }
+        return reduced;
+    }
+    ts.reducePathComponents = reducePathComponents;
+    /**
+     * Parse a path into an array containing a root component (at index 0) and zero or more path
+     * components (at indices > 0). The result is normalized.
+     * If the path is relative, the root component is `""`.
+     * If the path is absolute, the root component includes the first path separator (`/`).
+     */
+    function getNormalizedPathComponents(path, currentDirectory) {
+        return reducePathComponents(getPathComponents(path, currentDirectory));
+    }
+    ts.getNormalizedPathComponents = getNormalizedPathComponents;
+    function getNormalizedAbsolutePath(fileName, currentDirectory) {
+        return getPathFromPathComponents(getNormalizedPathComponents(fileName, currentDirectory));
+    }
+    ts.getNormalizedAbsolutePath = getNormalizedAbsolutePath;
+    /**
+     * Formats a parsed path consisting of a root component (at index 0) and zero or more path
+     * segments (at indices > 0).
+     */
+    function getPathFromPathComponents(pathComponents) {
+        if (pathComponents.length === 0)
+            return "";
+        var root = pathComponents[0] && ensureTrailingDirectorySeparator(pathComponents[0]);
+        if (pathComponents.length === 1)
+            return root;
+        return root + pathComponents.slice(1).join(ts.directorySeparator);
+    }
+    ts.getPathFromPathComponents = getPathFromPathComponents;
+    function getPathComponentsRelativeTo(from, to, stringEqualityComparer, getCanonicalFileName) {
+        var fromComponents = reducePathComponents(getPathComponents(from));
+        var toComponents = reducePathComponents(getPathComponents(to));
+        var start;
+        for (start = 0; start < fromComponents.length && start < toComponents.length; start++) {
+            var fromComponent = getCanonicalFileName(fromComponents[start]);
+            var toComponent = getCanonicalFileName(toComponents[start]);
+            var comparer = start === 0 ? ts.equateStringsCaseInsensitive : stringEqualityComparer;
+            if (!comparer(fromComponent, toComponent))
+                break;
+        }
+        if (start === 0) {
+            return toComponents;
+        }
+        var components = toComponents.slice(start);
+        var relative = [];
+        for (; start < fromComponents.length; start++) {
+            relative.push("..");
+        }
+        return [""].concat(relative, components);
+    }
+    function getRelativePathFromFile(from, to, getCanonicalFileName) {
+        return ensurePathIsNonModuleName(getRelativePathFromDirectory(getDirectoryPath(from), to, getCanonicalFileName));
+    }
+    ts.getRelativePathFromFile = getRelativePathFromFile;
+    function getRelativePathFromDirectory(fromDirectory, to, getCanonicalFileNameOrIgnoreCase) {
+        Debug.assert((getRootLength(fromDirectory) > 0) === (getRootLength(to) > 0), "Paths must either both be absolute or both be relative");
+        var getCanonicalFileName = typeof getCanonicalFileNameOrIgnoreCase === "function" ? getCanonicalFileNameOrIgnoreCase : ts.identity;
+        var ignoreCase = typeof getCanonicalFileNameOrIgnoreCase === "boolean" ? getCanonicalFileNameOrIgnoreCase : false;
+        var pathComponents = getPathComponentsRelativeTo(fromDirectory, to, ignoreCase ? ts.equateStringsCaseInsensitive : ts.equateStringsCaseSensitive, getCanonicalFileName);
+        return getPathFromPathComponents(pathComponents);
+    }
+    ts.getRelativePathFromDirectory = getRelativePathFromDirectory;
+    function getRelativePathToDirectoryOrUrl(directoryPathOrUrl, relativeOrAbsolutePath, currentDirectory, getCanonicalFileName, isAbsolutePathAnUrl) {
+        var pathComponents = getPathComponentsRelativeTo(resolvePath(currentDirectory, directoryPathOrUrl), resolvePath(currentDirectory, relativeOrAbsolutePath), ts.equateStringsCaseSensitive, getCanonicalFileName);
+        var firstComponent = pathComponents[0];
+        if (isAbsolutePathAnUrl && isRootedDiskPath(firstComponent)) {
+            var prefix = firstComponent.charAt(0) === ts.directorySeparator ? "file://" : "file:///";
+            pathComponents[0] = prefix + firstComponent;
+        }
+        return getPathFromPathComponents(pathComponents);
+    }
+    ts.getRelativePathToDirectoryOrUrl = getRelativePathToDirectoryOrUrl;
+    /**
+     * Ensures a path is either absolute (prefixed with `/` or `c:`) or dot-relative (prefixed
+     * with `./` or `../`) so as not to be confused with an unprefixed module name.
+     */
+    function ensurePathIsNonModuleName(path) {
+        return getRootLength(path) === 0 && !pathIsRelative(path) ? "./" + path : path;
+    }
+    ts.ensurePathIsNonModuleName = ensurePathIsNonModuleName;
+    function getBaseFileName(path, extensions, ignoreCase) {
+        path = normalizeSlashes(path);
+        // if the path provided is itself the root, then it has not file name.
+        var rootLength = getRootLength(path);
+        if (rootLength === path.length)
+            return "";
+        // return the trailing portion of the path starting after the last (non-terminal) directory
+        // separator but not including any trailing directory separator.
+        path = removeTrailingDirectorySeparator(path);
+        var name = path.slice(Math.max(getRootLength(path), path.lastIndexOf(ts.directorySeparator) + 1));
+        var extension = extensions !== undefined && ignoreCase !== undefined ? getAnyExtensionFromPath(name, extensions, ignoreCase) : undefined;
+        return extension ? name.slice(0, name.length - extension.length) : name;
+    }
+    ts.getBaseFileName = getBaseFileName;
+    /**
+     * Combines paths. If a path is absolute, it replaces any previous path.
+     */
+    function combinePaths(path) {
+        var paths = [];
+        for (var _i = 1; _i < arguments.length; _i++) {
+            paths[_i - 1] = arguments[_i];
+        }
+        if (path)
+            path = normalizeSlashes(path);
+        for (var _a = 0, paths_1 = paths; _a < paths_1.length; _a++) {
+            var relativePath = paths_1[_a];
+            if (!relativePath)
+                continue;
+            relativePath = normalizeSlashes(relativePath);
+            if (!path || getRootLength(relativePath) !== 0) {
+                path = relativePath;
+            }
+            else {
+                path = ensureTrailingDirectorySeparator(path) + relativePath;
+            }
+        }
+        return path;
+    }
+    ts.combinePaths = combinePaths;
+    /**
+     * Combines and resolves paths. If a path is absolute, it replaces any previous path. Any
+     * `.` and `..` path components are resolved.
+     */
+    function resolvePath(path) {
+        var paths = [];
+        for (var _i = 1; _i < arguments.length; _i++) {
+            paths[_i - 1] = arguments[_i];
+        }
+        var combined = ts.some(paths) ? combinePaths.apply(void 0, [path].concat(paths)) : normalizeSlashes(path);
+        var normalized = getPathFromPathComponents(reducePathComponents(getPathComponents(combined)));
+        return normalized && hasTrailingDirectorySeparator(combined) ? ensureTrailingDirectorySeparator(normalized) : normalized;
+    }
+    ts.resolvePath = resolvePath;
+    /**
+     * Determines whether a path has a trailing separator (`/` or `\\`).
+     */
+    function hasTrailingDirectorySeparator(path) {
+        if (path.length === 0)
+            return false;
+        var ch = path.charCodeAt(path.length - 1);
+        return ch === 47 /* slash */ || ch === 92 /* backslash */;
+    }
+    ts.hasTrailingDirectorySeparator = hasTrailingDirectorySeparator;
+    function removeTrailingDirectorySeparator(path) {
+        if (hasTrailingDirectorySeparator(path)) {
+            return path.substr(0, path.length - 1);
+        }
+        return path;
+    }
+    ts.removeTrailingDirectorySeparator = removeTrailingDirectorySeparator;
+    function ensureTrailingDirectorySeparator(path) {
+        if (!hasTrailingDirectorySeparator(path)) {
+            return path + ts.directorySeparator;
+        }
+        return path;
+    }
+    ts.ensureTrailingDirectorySeparator = ensureTrailingDirectorySeparator;
+    function comparePathsWorker(a, b, componentComparer) {
+        if (a === b)
+            return 0 /* EqualTo */;
+        if (a === undefined)
+            return -1 /* LessThan */;
+        if (b === undefined)
+            return 1 /* GreaterThan */;
+        var aComponents = reducePathComponents(getPathComponents(a));
+        var bComponents = reducePathComponents(getPathComponents(b));
+        var sharedLength = Math.min(aComponents.length, bComponents.length);
+        for (var i = 0; i < sharedLength; i++) {
+            var stringComparer = i === 0 ? ts.compareStringsCaseInsensitive : componentComparer;
+            var result = stringComparer(aComponents[i], bComponents[i]);
+            if (result !== 0 /* EqualTo */) {
+                return result;
+            }
+        }
+        return ts.compareValues(aComponents.length, bComponents.length);
+    }
+    /**
+     * Performs a case-sensitive comparison of two paths.
+     */
+    function comparePathsCaseSensitive(a, b) {
+        return comparePathsWorker(a, b, ts.compareStringsCaseSensitive);
+    }
+    ts.comparePathsCaseSensitive = comparePathsCaseSensitive;
+    /**
+     * Performs a case-insensitive comparison of two paths.
+     */
+    function comparePathsCaseInsensitive(a, b) {
+        return comparePathsWorker(a, b, ts.compareStringsCaseInsensitive);
+    }
+    ts.comparePathsCaseInsensitive = comparePathsCaseInsensitive;
+    function comparePaths(a, b, currentDirectory, ignoreCase) {
+        if (typeof currentDirectory === "string") {
+            a = combinePaths(currentDirectory, a);
+            b = combinePaths(currentDirectory, b);
+        }
+        else if (typeof currentDirectory === "boolean") {
+            ignoreCase = currentDirectory;
+        }
+        return comparePathsWorker(a, b, ts.getStringComparer(ignoreCase));
+    }
+    ts.comparePaths = comparePaths;
+    function containsPath(parent, child, currentDirectory, ignoreCase) {
+        if (typeof currentDirectory === "string") {
+            parent = combinePaths(currentDirectory, parent);
+            child = combinePaths(currentDirectory, child);
+        }
+        else if (typeof currentDirectory === "boolean") {
+            ignoreCase = currentDirectory;
+        }
+        if (parent === undefined || child === undefined)
+            return false;
+        if (parent === child)
+            return true;
+        var parentComponents = reducePathComponents(getPathComponents(parent));
+        var childComponents = reducePathComponents(getPathComponents(child));
+        if (childComponents.length < parentComponents.length) {
+            return false;
+        }
+        var componentEqualityComparer = ignoreCase ? ts.equateStringsCaseInsensitive : ts.equateStringsCaseSensitive;
+        for (var i = 0; i < parentComponents.length; i++) {
+            var equalityComparer = i === 0 ? ts.equateStringsCaseInsensitive : componentEqualityComparer;
+            if (!equalityComparer(parentComponents[i], childComponents[i])) {
+                return false;
+            }
+        }
+        return true;
+    }
+    ts.containsPath = containsPath;
+    function tryRemoveDirectoryPrefix(path, dirPath) {
+        var a = ts.tryRemovePrefix(path, dirPath);
+        if (a === undefined)
+            return undefined;
+        switch (a.charCodeAt(0)) {
+            case 47 /* slash */:
+            case 92 /* backslash */:
+                return a.slice(1);
+            default:
+                return undefined;
+        }
+    }
+    ts.tryRemoveDirectoryPrefix = tryRemoveDirectoryPrefix;
+    // Reserved characters, forces escaping of any non-word (or digit), non-whitespace character.
+    // It may be inefficient (we could just match (/[-[\]{}()*+?.,\\^$|#\s]/g), but this is future
+    // proof.
+    var reservedCharacterPattern = /[^\w\s\/]/g;
+    var wildcardCharCodes = [42 /* asterisk */, 63 /* question */];
+    function hasExtension(fileName) {
+        return ts.stringContains(getBaseFileName(fileName), ".");
+    }
+    ts.hasExtension = hasExtension;
+    ts.commonPackageFolders = ["node_modules", "bower_components", "jspm_packages"];
+    var implicitExcludePathRegexPattern = "(?!(" + ts.commonPackageFolders.join("|") + ")(/|$))";
+    var filesMatcher = {
+        /**
+         * Matches any single directory segment unless it is the last segment and a .min.js file
+         * Breakdown:
+         *  [^./]                   # matches everything up to the first . character (excluding directory separators)
+         *  (\\.(?!min\\.js$))?     # matches . characters but not if they are part of the .min.js file extension
+         */
+        singleAsteriskRegexFragment: "([^./]|(\\.(?!min\\.js$))?)*",
+        /**
+         * Regex for the ** wildcard. Matches any number of subdirectories. When used for including
+         * files or directories, does not match subdirectories that start with a . character
+         */
+        doubleAsteriskRegexFragment: "(/" + implicitExcludePathRegexPattern + "[^/.][^/]*)*?",
+        replaceWildcardCharacter: function (match) { return replaceWildcardCharacter(match, filesMatcher.singleAsteriskRegexFragment); }
+    };
+    var directoriesMatcher = {
+        singleAsteriskRegexFragment: "[^/]*",
+        /**
+         * Regex for the ** wildcard. Matches any number of subdirectories. When used for including
+         * files or directories, does not match subdirectories that start with a . character
+         */
+        doubleAsteriskRegexFragment: "(/" + implicitExcludePathRegexPattern + "[^/.][^/]*)*?",
+        replaceWildcardCharacter: function (match) { return replaceWildcardCharacter(match, directoriesMatcher.singleAsteriskRegexFragment); }
+    };
+    var excludeMatcher = {
+        singleAsteriskRegexFragment: "[^/]*",
+        doubleAsteriskRegexFragment: "(/.+?)?",
+        replaceWildcardCharacter: function (match) { return replaceWildcardCharacter(match, excludeMatcher.singleAsteriskRegexFragment); }
+    };
+    var wildcardMatchers = {
+        files: filesMatcher,
+        directories: directoriesMatcher,
+        exclude: excludeMatcher
+    };
+    function getRegularExpressionForWildcard(specs, basePath, usage) {
+        var patterns = getRegularExpressionsForWildcards(specs, basePath, usage);
+        if (!patterns || !patterns.length) {
+            return undefined;
+        }
+        var pattern = patterns.map(function (pattern) { return "(" + pattern + ")"; }).join("|");
+        // If excluding, match "foo/bar/baz...", but if including, only allow "foo".
+        var terminator = usage === "exclude" ? "($|/)" : "$";
+        return "^(" + pattern + ")" + terminator;
+    }
+    ts.getRegularExpressionForWildcard = getRegularExpressionForWildcard;
+    function getRegularExpressionsForWildcards(specs, basePath, usage) {
+        if (specs === undefined || specs.length === 0) {
+            return undefined;
+        }
+        return ts.flatMap(specs, function (spec) {
+            return spec && getSubPatternFromSpec(spec, basePath, usage, wildcardMatchers[usage]);
+        });
+    }
+    /**
+     * An "includes" path "foo" is implicitly a glob "foo/** /*" (without the space) if its last component has no extension,
+     * and does not contain any glob characters itself.
+     */
+    function isImplicitGlob(lastPathComponent) {
+        return !/[.*?]/.test(lastPathComponent);
+    }
+    ts.isImplicitGlob = isImplicitGlob;
+    function getSubPatternFromSpec(spec, basePath, usage, _a) {
+        var singleAsteriskRegexFragment = _a.singleAsteriskRegexFragment, doubleAsteriskRegexFragment = _a.doubleAsteriskRegexFragment, replaceWildcardCharacter = _a.replaceWildcardCharacter;
+        var subpattern = "";
+        var hasWrittenComponent = false;
+        var components = getNormalizedPathComponents(spec, basePath);
+        var lastComponent = ts.last(components);
+        if (usage !== "exclude" && lastComponent === "**") {
+            return undefined;
+        }
+        // getNormalizedPathComponents includes the separator for the root component.
+        // We need to remove to create our regex correctly.
+        components[0] = removeTrailingDirectorySeparator(components[0]);
+        if (isImplicitGlob(lastComponent)) {
+            components.push("**", "*");
+        }
+        var optionalCount = 0;
+        for (var _i = 0, components_1 = components; _i < components_1.length; _i++) {
+            var component = components_1[_i];
+            if (component === "**") {
+                subpattern += doubleAsteriskRegexFragment;
+            }
+            else {
+                if (usage === "directories") {
+                    subpattern += "(";
+                    optionalCount++;
+                }
+                if (hasWrittenComponent) {
+                    subpattern += ts.directorySeparator;
+                }
+                if (usage !== "exclude") {
+                    var componentPattern = "";
+                    // The * and ? wildcards should not match directories or files that start with . if they
+                    // appear first in a component. Dotted directories and files can be included explicitly
+                    // like so: **/.*/.*
+                    if (component.charCodeAt(0) === 42 /* asterisk */) {
+                        componentPattern += "([^./]" + singleAsteriskRegexFragment + ")?";
+                        component = component.substr(1);
+                    }
+                    else if (component.charCodeAt(0) === 63 /* question */) {
+                        componentPattern += "[^./]";
+                        component = component.substr(1);
+                    }
+                    componentPattern += component.replace(reservedCharacterPattern, replaceWildcardCharacter);
+                    // Patterns should not include subfolders like node_modules unless they are
+                    // explicitly included as part of the path.
+                    //
+                    // As an optimization, if the component pattern is the same as the component,
+                    // then there definitely were no wildcard characters and we do not need to
+                    // add the exclusion pattern.
+                    if (componentPattern !== component) {
+                        subpattern += implicitExcludePathRegexPattern;
+                    }
+                    subpattern += componentPattern;
+                }
+                else {
+                    subpattern += component.replace(reservedCharacterPattern, replaceWildcardCharacter);
+                }
+            }
+            hasWrittenComponent = true;
+        }
+        while (optionalCount > 0) {
+            subpattern += ")?";
+            optionalCount--;
+        }
+        return subpattern;
+    }
+    function replaceWildcardCharacter(match, singleAsteriskRegexFragment) {
+        return match === "*" ? singleAsteriskRegexFragment : match === "?" ? "[^/]" : "\\" + match;
+    }
+    /** @param path directory of the tsconfig.json */
+    function getFileMatcherPatterns(path, excludes, includes, useCaseSensitiveFileNames, currentDirectory) {
+        path = normalizePath(path);
+        currentDirectory = normalizePath(currentDirectory);
+        var absolutePath = combinePaths(currentDirectory, path);
+        return {
+            includeFilePatterns: ts.map(getRegularExpressionsForWildcards(includes, absolutePath, "files"), function (pattern) { return "^" + pattern + "$"; }),
+            includeFilePattern: getRegularExpressionForWildcard(includes, absolutePath, "files"),
+            includeDirectoryPattern: getRegularExpressionForWildcard(includes, absolutePath, "directories"),
+            excludePattern: getRegularExpressionForWildcard(excludes, absolutePath, "exclude"),
+            basePaths: getBasePaths(path, includes, useCaseSensitiveFileNames)
+        };
+    }
+    ts.getFileMatcherPatterns = getFileMatcherPatterns;
+    function getRegexFromPattern(pattern, useCaseSensitiveFileNames) {
+        return new RegExp(pattern, useCaseSensitiveFileNames ? "" : "i");
+    }
+    ts.getRegexFromPattern = getRegexFromPattern;
+    /** @param path directory of the tsconfig.json */
+    function matchFiles(path, extensions, excludes, includes, useCaseSensitiveFileNames, currentDirectory, depth, getFileSystemEntries) {
+        path = normalizePath(path);
+        currentDirectory = normalizePath(currentDirectory);
+        var patterns = getFileMatcherPatterns(path, excludes, includes, useCaseSensitiveFileNames, currentDirectory);
+        var includeFileRegexes = patterns.includeFilePatterns && patterns.includeFilePatterns.map(function (pattern) { return getRegexFromPattern(pattern, useCaseSensitiveFileNames); });
+        var includeDirectoryRegex = patterns.includeDirectoryPattern && getRegexFromPattern(patterns.includeDirectoryPattern, useCaseSensitiveFileNames);
+        var excludeRegex = patterns.excludePattern && getRegexFromPattern(patterns.excludePattern, useCaseSensitiveFileNames);
+        // Associate an array of results with each include regex. This keeps results in order of the "include" order.
+        // If there are no "includes", then just put everything in results[0].
+        var results = includeFileRegexes ? includeFileRegexes.map(function () { return []; }) : [[]];
+        for (var _i = 0, _a = patterns.basePaths; _i < _a.length; _i++) {
+            var basePath = _a[_i];
+            visitDirectory(basePath, combinePaths(currentDirectory, basePath), depth);
+        }
+        return ts.flatten(results);
+        function visitDirectory(path, absolutePath, depth) {
+            var _a = getFileSystemEntries(path), files = _a.files, directories = _a.directories;
+            var _loop_1 = function (current) {
+                var name = combinePaths(path, current);
+                var absoluteName = combinePaths(absolutePath, current);
+                if (extensions && !ts.fileExtensionIsOneOf(name, extensions))
+                    return "continue";
+                if (excludeRegex && excludeRegex.test(absoluteName))
+                    return "continue";
+                if (!includeFileRegexes) {
+                    results[0].push(name);
+                }
+                else {
+                    var includeIndex = ts.findIndex(includeFileRegexes, function (re) { return re.test(absoluteName); });
+                    if (includeIndex !== -1) {
+                        results[includeIndex].push(name);
+                    }
+                }
+            };
+            for (var _i = 0, _b = ts.sort(files, ts.compareStringsCaseSensitive); _i < _b.length; _i++) {
+                var current = _b[_i];
+                _loop_1(current);
+            }
+            if (depth !== undefined) {
+                depth--;
+                if (depth === 0) {
+                    return;
+                }
+            }
+            for (var _c = 0, _d = ts.sort(directories, ts.compareStringsCaseSensitive); _c < _d.length; _c++) {
+                var current = _d[_c];
+                var name = combinePaths(path, current);
+                var absoluteName = combinePaths(absolutePath, current);
+                if ((!includeDirectoryRegex || includeDirectoryRegex.test(absoluteName)) &&
+                    (!excludeRegex || !excludeRegex.test(absoluteName))) {
+                    visitDirectory(name, absoluteName, depth);
+                }
+            }
+        }
+    }
+    ts.matchFiles = matchFiles;
+    /**
+     * Computes the unique non-wildcard base paths amongst the provided include patterns.
+     */
+    function getBasePaths(path, includes, useCaseSensitiveFileNames) {
+        // Storage for our results in the form of literal paths (e.g. the paths as written by the user).
+        var basePaths = [path];
+        if (includes) {
+            // Storage for literal base paths amongst the include patterns.
+            var includeBasePaths = [];
+            for (var _i = 0, includes_1 = includes; _i < includes_1.length; _i++) {
+                var include = includes_1[_i];
+                // We also need to check the relative paths by converting them to absolute and normalizing
+                // in case they escape the base path (e.g "..\somedirectory")
+                var absolute = isRootedDiskPath(include) ? include : normalizePath(combinePaths(path, include));
+                // Append the literal and canonical candidate base paths.
+                includeBasePaths.push(getIncludeBasePath(absolute));
+            }
+            // Sort the offsets array using either the literal or canonical path representations.
+            includeBasePaths.sort(ts.getStringComparer(!useCaseSensitiveFileNames));
+            var _loop_2 = function (includeBasePath) {
+                if (ts.every(basePaths, function (basePath) { return !containsPath(basePath, includeBasePath, path, !useCaseSensitiveFileNames); })) {
+                    basePaths.push(includeBasePath);
+                }
+            };
+            // Iterate over each include base path and include unique base paths that are not a
+            // subpath of an existing base path
+            for (var _a = 0, includeBasePaths_1 = includeBasePaths; _a < includeBasePaths_1.length; _a++) {
+                var includeBasePath = includeBasePaths_1[_a];
+                _loop_2(includeBasePath);
+            }
+        }
+        return basePaths;
+    }
+    function getIncludeBasePath(absolute) {
+        var wildcardOffset = ts.indexOfAnyCharCode(absolute, wildcardCharCodes);
+        if (wildcardOffset < 0) {
+            // No "*" or "?" in the path
+            return !hasExtension(absolute)
+                ? absolute
+                : removeTrailingDirectorySeparator(getDirectoryPath(absolute));
+        }
+        return absolute.substring(0, absolute.lastIndexOf(ts.directorySeparator, wildcardOffset));
+    }
+    function ensureScriptKind(fileName, scriptKind) {
+        // Using scriptKind as a condition handles both:
+        // - 'scriptKind' is unspecified and thus it is `undefined`
+        // - 'scriptKind' is set and it is `Unknown` (0)
+        // If the 'scriptKind' is 'undefined' or 'Unknown' then we attempt
+        // to get the ScriptKind from the file name. If it cannot be resolved
+        // from the file name then the default 'TS' script kind is returned.
+        return scriptKind || getScriptKindFromFileName(fileName) || 3 /* TS */;
+    }
+    ts.ensureScriptKind = ensureScriptKind;
+    function getScriptKindFromFileName(fileName) {
+        var ext = fileName.substr(fileName.lastIndexOf("."));
+        switch (ext.toLowerCase()) {
+            case ".js" /* Js */:
+                return 1 /* JS */;
+            case ".jsx" /* Jsx */:
+                return 2 /* JSX */;
+            case ".ts" /* Ts */:
+                return 3 /* TS */;
+            case ".tsx" /* Tsx */:
+                return 4 /* TSX */;
+            case ".json" /* Json */:
+                return 6 /* JSON */;
+            default:
+                return 0 /* Unknown */;
+        }
+    }
+    ts.getScriptKindFromFileName = getScriptKindFromFileName;
+    /**
+     *  List of supported extensions in order of file resolution precedence.
+     */
+    ts.supportedTypeScriptExtensions = [".ts" /* Ts */, ".tsx" /* Tsx */, ".d.ts" /* Dts */];
+    /** Must have ".d.ts" first because if ".ts" goes first, that will be detected as the extension instead of ".d.ts". */
+    ts.supportedTypescriptExtensionsForExtractExtension = [".d.ts" /* Dts */, ".ts" /* Ts */, ".tsx" /* Tsx */];
+    ts.supportedJavascriptExtensions = [".js" /* Js */, ".jsx" /* Jsx */];
+    var allSupportedExtensions = ts.supportedTypeScriptExtensions.concat(ts.supportedJavascriptExtensions);
+    function getSupportedExtensions(options, extraFileExtensions) {
+        var needJsExtensions = options && options.allowJs;
+        if (!extraFileExtensions || extraFileExtensions.length === 0) {
+            return needJsExtensions ? allSupportedExtensions : ts.supportedTypeScriptExtensions;
+        }
+        var extensions = (needJsExtensions ? allSupportedExtensions : ts.supportedTypeScriptExtensions).concat(ts.mapDefined(extraFileExtensions, function (x) { return x.scriptKind === 7 /* Deferred */ || needJsExtensions && isJavaScriptLike(x.scriptKind) ? x.extension : undefined; }));
+        return ts.deduplicate(extensions, ts.equateStringsCaseSensitive, ts.compareStringsCaseSensitive);
+    }
+    ts.getSupportedExtensions = getSupportedExtensions;
+    function isJavaScriptLike(scriptKind) {
+        return scriptKind === 1 /* JS */ || scriptKind === 2 /* JSX */;
+    }
+    function hasJavaScriptFileExtension(fileName) {
+        return ts.some(ts.supportedJavascriptExtensions, function (extension) { return ts.fileExtensionIs(fileName, extension); });
+    }
+    ts.hasJavaScriptFileExtension = hasJavaScriptFileExtension;
+    function hasTypeScriptFileExtension(fileName) {
+        return ts.some(ts.supportedTypeScriptExtensions, function (extension) { return ts.fileExtensionIs(fileName, extension); });
+    }
+    ts.hasTypeScriptFileExtension = hasTypeScriptFileExtension;
+    function isSupportedSourceFileName(fileName, compilerOptions, extraFileExtensions) {
+        if (!fileName) {
+            return false;
+        }
+        for (var _i = 0, _a = getSupportedExtensions(compilerOptions, extraFileExtensions); _i < _a.length; _i++) {
+            var extension = _a[_i];
+            if (ts.fileExtensionIs(fileName, extension)) {
+                return true;
+            }
+        }
+        return false;
+    }
+    ts.isSupportedSourceFileName = isSupportedSourceFileName;
+    /**
+     * Extension boundaries by priority. Lower numbers indicate higher priorities, and are
+     * aligned to the offset of the highest priority extension in the
+     * allSupportedExtensions array.
+     */
+    var ExtensionPriority;
+    (function (ExtensionPriority) {
+        ExtensionPriority[ExtensionPriority["TypeScriptFiles"] = 0] = "TypeScriptFiles";
+        ExtensionPriority[ExtensionPriority["DeclarationAndJavaScriptFiles"] = 2] = "DeclarationAndJavaScriptFiles";
+        ExtensionPriority[ExtensionPriority["Highest"] = 0] = "Highest";
+        ExtensionPriority[ExtensionPriority["Lowest"] = 2] = "Lowest";
+    })(ExtensionPriority = ts.ExtensionPriority || (ts.ExtensionPriority = {}));
+    function getExtensionPriority(path, supportedExtensions) {
+        for (var i = supportedExtensions.length - 1; i >= 0; i--) {
+            if (ts.fileExtensionIs(path, supportedExtensions[i])) {
+                return adjustExtensionPriority(i, supportedExtensions);
+            }
+        }
+        // If its not in the list of supported extensions, this is likely a
+        // TypeScript file with a non-ts extension
+        return 0 /* Highest */;
+    }
+    ts.getExtensionPriority = getExtensionPriority;
+    /**
+     * Adjusts an extension priority to be the highest priority within the same range.
+     */
+    function adjustExtensionPriority(extensionPriority, supportedExtensions) {
+        if (extensionPriority < 2 /* DeclarationAndJavaScriptFiles */) {
+            return 0 /* TypeScriptFiles */;
+        }
+        else if (extensionPriority < supportedExtensions.length) {
+            return 2 /* DeclarationAndJavaScriptFiles */;
+        }
+        else {
+            return supportedExtensions.length;
+        }
+    }
+    ts.adjustExtensionPriority = adjustExtensionPriority;
+    /**
+     * Gets the next lowest extension priority for a given priority.
+     */
+    function getNextLowestExtensionPriority(extensionPriority, supportedExtensions) {
+        if (extensionPriority < 2 /* DeclarationAndJavaScriptFiles */) {
+            return 2 /* DeclarationAndJavaScriptFiles */;
+        }
+        else {
+            return supportedExtensions.length;
+        }
+    }
+    ts.getNextLowestExtensionPriority = getNextLowestExtensionPriority;
+    var extensionsToRemove = [".d.ts" /* Dts */, ".ts" /* Ts */, ".js" /* Js */, ".tsx" /* Tsx */, ".jsx" /* Jsx */, ".json" /* Json */];
+    function removeFileExtension(path) {
+        for (var _i = 0, extensionsToRemove_1 = extensionsToRemove; _i < extensionsToRemove_1.length; _i++) {
+            var ext = extensionsToRemove_1[_i];
+            var extensionless = tryRemoveExtension(path, ext);
+            if (extensionless !== undefined) {
+                return extensionless;
+            }
+        }
+        return path;
+    }
+    ts.removeFileExtension = removeFileExtension;
+    function tryRemoveExtension(path, extension) {
+        return ts.fileExtensionIs(path, extension) ? removeExtension(path, extension) : undefined;
+    }
+    ts.tryRemoveExtension = tryRemoveExtension;
+    function removeExtension(path, extension) {
+        return path.substring(0, path.length - extension.length);
+    }
+    ts.removeExtension = removeExtension;
+    function changeExtension(path, newExtension) {
+        return changeAnyExtension(path, newExtension, extensionsToRemove, /*ignoreCase*/ false);
+    }
+    ts.changeExtension = changeExtension;
+    function changeAnyExtension(path, ext, extensions, ignoreCase) {
+        var pathext = extensions !== undefined && ignoreCase !== undefined ? getAnyExtensionFromPath(path, extensions, ignoreCase) : getAnyExtensionFromPath(path);
+        return pathext ? path.slice(0, path.length - pathext.length) + (ts.startsWith(ext, ".") ? ext : "." + ext) : path;
+    }
+    ts.changeAnyExtension = changeAnyExtension;
+    var Debug;
+    (function (Debug) {
+        function showSymbol(symbol) {
+            var symbolFlags = ts.SymbolFlags;
+            return "{ flags: " + (symbolFlags ? showFlags(symbol.flags, symbolFlags) : symbol.flags) + "; declarations: " + ts.map(symbol.declarations, showSyntaxKind) + " }";
+        }
+        Debug.showSymbol = showSymbol;
+        function showFlags(flags, flagsEnum) {
+            var out = [];
+            for (var pow = 0; pow <= 30; pow++) {
+                var n = 1 << pow;
+                if (flags & n) {
+                    out.push(flagsEnum[n]);
+                }
+            }
+            return out.join("|");
+        }
+        function showSyntaxKind(node) {
+            var syntaxKind = ts.SyntaxKind;
+            return syntaxKind ? syntaxKind[node.kind] : node.kind.toString();
+        }
+        Debug.showSyntaxKind = showSyntaxKind;
+    })(Debug = ts.Debug || (ts.Debug = {}));
+    function tryParsePattern(pattern) {
+        // This should be verified outside of here and a proper error thrown.
+        Debug.assert(hasZeroOrOneAsteriskCharacter(pattern));
+        var indexOfStar = pattern.indexOf("*");
+        return indexOfStar === -1 ? undefined : {
+            prefix: pattern.substr(0, indexOfStar),
+            suffix: pattern.substr(indexOfStar + 1)
+        };
+    }
+    ts.tryParsePattern = tryParsePattern;
+    function positionIsSynthesized(pos) {
+        // This is a fast way of testing the following conditions:
+        //  pos === undefined || pos === null || isNaN(pos) || pos < 0;
+        return !(pos >= 0);
+    }
+    ts.positionIsSynthesized = positionIsSynthesized;
+    /** True if an extension is one of the supported TypeScript extensions. */
+    function extensionIsTypeScript(ext) {
+        return ext === ".ts" /* Ts */ || ext === ".tsx" /* Tsx */ || ext === ".d.ts" /* Dts */;
+    }
+    ts.extensionIsTypeScript = extensionIsTypeScript;
+    function resolutionExtensionIsTypeScriptOrJson(ext) {
+        return extensionIsTypeScript(ext) || ext === ".json" /* Json */;
+    }
+    ts.resolutionExtensionIsTypeScriptOrJson = resolutionExtensionIsTypeScriptOrJson;
+    /**
+     * Gets the extension from a path.
+     * Path must have a valid extension.
+     */
+    function extensionFromPath(path) {
+        var ext = tryGetExtensionFromPath(path);
+        return ext !== undefined ? ext : Debug.fail("File " + path + " has unknown extension.");
+    }
+    ts.extensionFromPath = extensionFromPath;
+    function isAnySupportedFileExtension(path) {
+        return tryGetExtensionFromPath(path) !== undefined;
+    }
+    ts.isAnySupportedFileExtension = isAnySupportedFileExtension;
+    function tryGetExtensionFromPath(path) {
+        return ts.find(ts.supportedTypescriptExtensionsForExtractExtension, function (e) { return ts.fileExtensionIs(path, e); }) || ts.find(ts.supportedJavascriptExtensions, function (e) { return ts.fileExtensionIs(path, e); });
+    }
+    ts.tryGetExtensionFromPath = tryGetExtensionFromPath;
+    function getAnyExtensionFromPathWorker(path, extensions, stringEqualityComparer) {
+        if (typeof extensions === "string")
+            extensions = [extensions];
+        for (var _i = 0, extensions_1 = extensions; _i < extensions_1.length; _i++) {
+            var extension = extensions_1[_i];
+            if (!ts.startsWith(extension, "."))
+                extension = "." + extension;
+            if (path.length >= extension.length && path.charAt(path.length - extension.length) === ".") {
+                var pathExtension = path.slice(path.length - extension.length);
+                if (stringEqualityComparer(pathExtension, extension)) {
+                    return pathExtension;
+                }
+            }
+        }
+        return "";
+    }
+    function getAnyExtensionFromPath(path, extensions, ignoreCase) {
+        // Retrieves any string from the final "." onwards from a base file name.
+        // Unlike extensionFromPath, which throws an exception on unrecognized extensions.
+        if (extensions) {
+            return getAnyExtensionFromPathWorker(path, extensions, ignoreCase ? ts.equateStringsCaseInsensitive : ts.equateStringsCaseSensitive);
+        }
+        var baseFileName = getBaseFileName(path);
+        var extensionIndex = baseFileName.lastIndexOf(".");
+        if (extensionIndex >= 0) {
+            return baseFileName.substring(extensionIndex);
+        }
+        return "";
+    }
+    ts.getAnyExtensionFromPath = getAnyExtensionFromPath;
+    function isCheckJsEnabledForFile(sourceFile, compilerOptions) {
+        return sourceFile.checkJsDirective ? sourceFile.checkJsDirective.enabled : compilerOptions.checkJs;
+    }
+    ts.isCheckJsEnabledForFile = isCheckJsEnabledForFile;
+    ts.emptyFileSystemEntries = {
+        files: ts.emptyArray,
+        directories: ts.emptyArray
+    };
+    /**
+     * patternStrings contains both pattern strings (containing "*") and regular strings.
+     * Return an exact match if possible, or a pattern match, or undefined.
+     * (These are verified by verifyCompilerOptions to have 0 or 1 "*" characters.)
+     */
+    function matchPatternOrExact(patternStrings, candidate) {
+        var patterns = [];
+        for (var _i = 0, patternStrings_1 = patternStrings; _i < patternStrings_1.length; _i++) {
+            var patternString = patternStrings_1[_i];
+            var pattern = tryParsePattern(patternString);
+            if (pattern) {
+                patterns.push(pattern);
+            }
+            else if (patternString === candidate) {
+                // pattern was matched as is - no need to search further
+                return patternString;
+            }
+        }
+        return ts.findBestPatternMatch(patterns, function (_) { return _; }, candidate);
+    }
+    ts.matchPatternOrExact = matchPatternOrExact;
 })(ts || (ts = {}));
 var ts;
 (function (ts) {
@@ -14788,7 +14922,6 @@ var ts;
         SignatureFlags[SignatureFlags["Yield"] = 1] = "Yield";
         SignatureFlags[SignatureFlags["Await"] = 2] = "Await";
         SignatureFlags[SignatureFlags["Type"] = 4] = "Type";
-        SignatureFlags[SignatureFlags["RequireCompleteParameterList"] = 8] = "RequireCompleteParameterList";
         SignatureFlags[SignatureFlags["IgnoreMissingOpenBrace"] = 16] = "IgnoreMissingOpenBrace";
         SignatureFlags[SignatureFlags["JSDoc"] = 32] = "JSDoc";
     })(SignatureFlags || (SignatureFlags = {}));
@@ -15943,8 +16076,8 @@ var ts;
                 kind === 71 /* Identifier */ ? new IdentifierConstructor(kind, p, p) :
                     new TokenConstructor(kind, p, p);
         }
-        function createNodeWithJSDoc(kind) {
-            var node = createNode(kind);
+        function createNodeWithJSDoc(kind, pos) {
+            var node = createNode(kind, pos);
             if (scanner.getTokenFlags() & 2 /* PrecedingJSDocComment */) {
                 addJSDocComment(node);
             }
@@ -16800,6 +16933,23 @@ var ts;
             }
             return finishNode(node);
         }
+        // If true, we should abort parsing an error function.
+        function typeHasArrowFunctionBlockingParseError(node) {
+            switch (node.kind) {
+                case 162 /* TypeReference */:
+                    return ts.nodeIsMissing(node.typeName);
+                case 163 /* FunctionType */:
+                case 164 /* ConstructorType */: {
+                    var _a = node, parameters = _a.parameters, type = _a.type;
+                    // parameters.pos === parameters.end only if we used parseMissingList, else should contain at least `()`
+                    return parameters.pos === parameters.end || typeHasArrowFunctionBlockingParseError(type);
+                }
+                case 173 /* ParenthesizedType */:
+                    return typeHasArrowFunctionBlockingParseError(node.type);
+                default:
+                    return false;
+            }
+        }
         function parseThisTypePredicate(lhs) {
             nextToken();
             var node = createNode(161 /* TypePredicate */, lhs.pos);
@@ -16970,18 +17120,20 @@ var ts;
             return finishNode(node);
         }
         /**
+         * Note: If returnToken is EqualsGreaterThanToken, `signature.type` will always be defined.
          * @returns If return type parsing succeeds
          */
         function fillSignature(returnToken, flags, signature) {
             if (!(flags & 32 /* JSDoc */)) {
                 signature.typeParameters = parseTypeParameters();
             }
-            signature.parameters = parseParameterList(flags); // TODO: GH#18217
+            var parametersParsedSuccessfully = parseParameterList(signature, flags);
             if (shouldParseReturnType(returnToken, !!(flags & 4 /* Type */))) {
                 signature.type = parseTypeOrTypePredicate();
-                return signature.type !== undefined;
+                if (typeHasArrowFunctionBlockingParseError(signature.type))
+                    return false;
             }
-            return true;
+            return parametersParsedSuccessfully;
         }
         function shouldParseReturnType(returnToken, isType) {
             if (returnToken === 36 /* EqualsGreaterThanToken */) {
@@ -16999,7 +17151,8 @@ var ts;
             }
             return false;
         }
-        function parseParameterList(flags) {
+        // Returns true on success.
+        function parseParameterList(signature, flags) {
             // FormalParameters [Yield,Await]: (modified)
             //      [empty]
             //      FormalParameterList[?Yield,Await]
@@ -17013,25 +17166,18 @@ var ts;
             //
             // SingleNameBinding [Yield,Await]:
             //      BindingIdentifier[?Yield,?Await]Initializer [In, ?Yield,?Await] opt
-            if (parseExpected(19 /* OpenParenToken */)) {
-                var savedYieldContext = inYieldContext();
-                var savedAwaitContext = inAwaitContext();
-                setYieldContext(!!(flags & 1 /* Yield */));
-                setAwaitContext(!!(flags & 2 /* Await */));
-                var result = parseDelimitedList(16 /* Parameters */, flags & 32 /* JSDoc */ ? parseJSDocParameter : parseParameter);
-                setYieldContext(savedYieldContext);
-                setAwaitContext(savedAwaitContext);
-                if (!parseExpected(20 /* CloseParenToken */) && (flags & 8 /* RequireCompleteParameterList */)) {
-                    // Caller insisted that we had to end with a )   We didn't.  So just return
-                    // undefined here.
-                    return undefined;
-                }
-                return result;
+            if (!parseExpected(19 /* OpenParenToken */)) {
+                signature.parameters = createMissingList();
+                return false;
             }
-            // We didn't even have an open paren.  If the caller requires a complete parameter list,
-            // we definitely can't provide that.  However, if they're ok with an incomplete one,
-            // then just return an empty set of parameters.
-            return (flags & 8 /* RequireCompleteParameterList */) ? undefined : createMissingList();
+            var savedYieldContext = inYieldContext();
+            var savedAwaitContext = inAwaitContext();
+            setYieldContext(!!(flags & 1 /* Yield */));
+            setAwaitContext(!!(flags & 2 /* Await */));
+            signature.parameters = parseDelimitedList(16 /* Parameters */, flags & 32 /* JSDoc */ ? parseJSDocParameter : parseParameter);
+            setYieldContext(savedYieldContext);
+            setAwaitContext(savedAwaitContext);
+            return parseExpected(20 /* CloseParenToken */);
         }
         function parseTypeMemberSemicolon() {
             // We allow type members to be separated by commas or (possibly ASI) semicolons.
@@ -17260,23 +17406,14 @@ var ts;
             var node = createNode(173 /* ParenthesizedType */);
             parseExpected(19 /* OpenParenToken */);
             node.type = parseType();
-            if (!node.type) {
-                return undefined; // TODO: GH#18217
-            }
             parseExpected(20 /* CloseParenToken */);
             return finishNode(node);
         }
-        function parseFunctionOrConstructorType(kind) {
-            var node = createNodeWithJSDoc(kind);
-            if (kind === 164 /* ConstructorType */) {
-                parseExpected(94 /* NewKeyword */);
-            }
-            if (!fillSignature(36 /* EqualsGreaterThanToken */, 4 /* Type */ | (sourceFile.languageVariant === 1 /* JSX */ ? 8 /* RequireCompleteParameterList */ : 0), node)) {
-                return undefined;
-            }
-            if (!node.parameters) {
-                return undefined;
-            }
+        function parseFunctionOrConstructorType() {
+            var pos = getNodePos();
+            var kind = parseOptional(94 /* NewKeyword */) ? 164 /* ConstructorType */ : 163 /* FunctionType */;
+            var node = createNodeWithJSDoc(kind, pos);
+            fillSignature(36 /* EqualsGreaterThanToken */, 4 /* Type */, node);
             return finishNode(node);
         }
         function parseKeywordAndNoDot() {
@@ -17594,11 +17731,8 @@ var ts;
             return doOutsideOfContext(20480 /* TypeExcludesFlags */, parseTypeWorker);
         }
         function parseTypeWorker(noConditionalTypes) {
-            if (isStartOfFunctionType()) {
-                return parseFunctionOrConstructorType(163 /* FunctionType */); // TODO: GH#18217
-            }
-            if (token() === 94 /* NewKeyword */) {
-                return parseFunctionOrConstructorType(164 /* ConstructorType */);
+            if (isStartOfFunctionType() || token() === 94 /* NewKeyword */) {
+                return parseFunctionOrConstructorType();
             }
             var type = parseUnionTypeOrHigher();
             if (!noConditionalTypes && !scanner.hasPrecedingLineBreak() && parseOptional(85 /* ExtendsKeyword */)) {
@@ -18029,11 +18163,7 @@ var ts;
             // a => (b => c)
             // And think that "(b =>" was actually a parenthesized arrow function with a missing
             // close paren.
-            if (!fillSignature(56 /* ColonToken */, isAsync | (allowAmbiguity ? 0 /* None */ : 8 /* RequireCompleteParameterList */), node)) {
-                return undefined;
-            }
-            // If we couldn't get parameters, we definitely could not parse out an arrow function.
-            if (!node.parameters) {
+            if (!fillSignature(56 /* ColonToken */, isAsync, node) && !allowAmbiguity) {
                 return undefined;
             }
             // Parsing a signature isn't enough.
@@ -20581,51 +20711,39 @@ var ts;
                     nextJSDocToken();
                     var tagName = parseJSDocIdentifierName();
                     skipWhitespace();
-                    if (!tagName) {
-                        return;
-                    }
                     var tag;
-                    if (tagName) {
-                        switch (tagName.escapedText) {
-                            case "augments":
-                            case "extends":
-                                tag = parseAugmentsTag(atToken, tagName);
-                                break;
-                            case "class":
-                            case "constructor":
-                                tag = parseClassTag(atToken, tagName);
-                                break;
-                            case "arg":
-                            case "argument":
-                            case "param":
-                                return parseParameterOrPropertyTag(atToken, tagName, 2 /* Parameter */, indent);
-                            case "return":
-                            case "returns":
-                                tag = parseReturnTag(atToken, tagName);
-                                break;
-                            case "template":
-                                tag = parseTemplateTag(atToken, tagName);
-                                break;
-                            case "type":
-                                tag = parseTypeTag(atToken, tagName);
-                                break;
-                            case "typedef":
-                                tag = parseTypedefTag(atToken, tagName, indent);
-                                break;
-                            case "callback":
-                                tag = parseCallbackTag(atToken, tagName, indent);
-                                break;
-                            default:
-                                tag = parseUnknownTag(atToken, tagName);
-                                break;
-                        }
-                    }
-                    else {
-                        tag = parseUnknownTag(atToken, tagName);
-                    }
-                    if (!tag) {
-                        // a badly malformed tag should not be added to the list of tags
-                        return;
+                    switch (tagName.escapedText) {
+                        case "augments":
+                        case "extends":
+                            tag = parseAugmentsTag(atToken, tagName);
+                            break;
+                        case "class":
+                        case "constructor":
+                            tag = parseClassTag(atToken, tagName);
+                            break;
+                        case "arg":
+                        case "argument":
+                        case "param":
+                            return parseParameterOrPropertyTag(atToken, tagName, 2 /* Parameter */, indent);
+                        case "return":
+                        case "returns":
+                            tag = parseReturnTag(atToken, tagName);
+                            break;
+                        case "template":
+                            tag = parseTemplateTag(atToken, tagName);
+                            break;
+                        case "type":
+                            tag = parseTypeTag(atToken, tagName);
+                            break;
+                        case "typedef":
+                            tag = parseTypedefTag(atToken, tagName, indent);
+                            break;
+                        case "callback":
+                            tag = parseCallbackTag(atToken, tagName, indent);
+                            break;
+                        default:
+                            tag = parseUnknownTag(atToken, tagName);
+                            break;
                     }
                     if (!tag.comment) {
                         // some tags, like typedef and callback, have already parsed their comments earlier
@@ -20835,11 +20953,11 @@ var ts;
                     return res;
                 }
                 function parsePropertyAccessEntityNameExpression() {
-                    var node = parseJSDocIdentifierName(/*createIfMissing*/ true);
+                    var node = parseJSDocIdentifierName();
                     while (parseOptional(23 /* DotToken */)) {
                         var prop = createNode(185 /* PropertyAccessExpression */, node.pos);
                         prop.expression = node;
-                        prop.name = parseJSDocIdentifierName(); // TODO: GH#18217
+                        prop.name = parseJSDocIdentifierName();
                         node = finishNode(prop);
                     }
                     return node;
@@ -20898,8 +21016,11 @@ var ts;
                 }
                 function parseJSDocTypeNameWithNamespace(nested) {
                     var pos = scanner.getTokenPos();
+                    if (!ts.tokenIsIdentifierOrKeyword(token())) {
+                        return undefined;
+                    }
                     var typeNameOrNamespaceName = parseJSDocIdentifierName();
-                    if (typeNameOrNamespaceName && parseOptional(23 /* DotToken */)) {
+                    if (parseOptional(23 /* DotToken */)) {
                         var jsDocNamespaceNode = createNode(239 /* ModuleDeclaration */, pos);
                         if (nested) {
                             jsDocNamespaceNode.flags |= 4 /* NestedNamespace */;
@@ -20908,7 +21029,7 @@ var ts;
                         jsDocNamespaceNode.body = parseJSDocTypeNameWithNamespace(/*nested*/ true);
                         return finishNode(jsDocNamespaceNode);
                     }
-                    if (typeNameOrNamespaceName && nested) {
+                    if (nested) {
                         typeNameOrNamespaceName.isInJSDocNamespace = true;
                     }
                     return typeNameOrNamespaceName;
@@ -21010,9 +21131,6 @@ var ts;
                     nextJSDocToken();
                     var tagName = parseJSDocIdentifierName();
                     skipWhitespace();
-                    if (!tagName) {
-                        return false;
-                    }
                     var t;
                     switch (tagName.escapedText) {
                         case "type":
@@ -21047,11 +21165,7 @@ var ts;
                     do {
                         skipWhitespace();
                         var typeParameter = createNode(148 /* TypeParameter */);
-                        if (!ts.tokenIsIdentifierOrKeyword(token())) {
-                            parseErrorAtCurrentToken(ts.Diagnostics.Unexpected_token_A_type_parameter_name_was_expected_without_curly_braces);
-                            return undefined;
-                        }
-                        typeParameter.name = parseJSDocIdentifierName();
+                        typeParameter.name = parseJSDocIdentifierName(ts.Diagnostics.Unexpected_token_A_type_parameter_name_was_expected_without_curly_braces);
                         skipWhitespace();
                         finishNode(typeParameter);
                         typeParameters.push(typeParameter);
@@ -21077,7 +21191,7 @@ var ts;
                     return false;
                 }
                 function parseJSDocEntityName() {
-                    var entity = parseJSDocIdentifierName(/*createIfMissing*/ true);
+                    var entity = parseJSDocIdentifierName();
                     if (parseOptional(21 /* OpenBracketToken */)) {
                         parseExpected(22 /* CloseBracketToken */);
                         // Note that y[] is accepted as an entity name, but the postfix brackets are not saved for checking.
@@ -21085,7 +21199,7 @@ var ts;
                         // but it's not worth it to enforce that restriction.
                     }
                     while (parseOptional(23 /* DotToken */)) {
-                        var name = parseJSDocIdentifierName(/*createIfMissing*/ true);
+                        var name = parseJSDocIdentifierName();
                         if (parseOptional(21 /* OpenBracketToken */)) {
                             parseExpected(22 /* CloseBracketToken */);
                         }
@@ -21093,16 +21207,9 @@ var ts;
                     }
                     return entity;
                 }
-                function parseJSDocIdentifierName(createIfMissing) {
-                    if (createIfMissing === void 0) { createIfMissing = false; }
+                function parseJSDocIdentifierName(message) {
                     if (!ts.tokenIsIdentifierOrKeyword(token())) {
-                        if (createIfMissing) {
-                            return createMissingNode(71 /* Identifier */, /*reportAtCurrentPosition*/ true, ts.Diagnostics.Identifier_expected);
-                        }
-                        else {
-                            parseErrorAtCurrentToken(ts.Diagnostics.Identifier_expected);
-                            return undefined;
-                        }
+                        return createMissingNode(71 /* Identifier */, /*reportAtCurrentPosition*/ !message, message || ts.Diagnostics.Identifier_expected);
                     }
                     var pos = scanner.getTokenPos();
                     var end = scanner.getTextPos();
@@ -21224,8 +21331,8 @@ var ts;
                 array._children = undefined;
                 array.pos += delta;
                 array.end += delta;
-                for (var _i = 0, array_8 = array; _i < array_8.length; _i++) {
-                    var node = array_8[_i];
+                for (var _i = 0, array_1 = array; _i < array_1.length; _i++) {
+                    var node = array_1[_i];
                     visitNode(node);
                 }
             }
@@ -21375,8 +21482,8 @@ var ts;
                     array._children = undefined;
                     // Adjust the pos or end (or both) of the intersecting array accordingly.
                     adjustIntersectingElement(array, changeStart, changeRangeOldEnd, changeRangeNewEnd, delta);
-                    for (var _i = 0, array_9 = array; _i < array_9.length; _i++) {
-                        var node = array_9[_i];
+                    for (var _i = 0, array_2 = array; _i < array_2.length; _i++) {
+                        var node = array_2[_i];
                         visitNode(node);
                     }
                     return;
@@ -21639,6 +21746,7 @@ var ts;
         context.checkJsDirective = undefined;
         context.referencedFiles = [];
         context.typeReferenceDirectives = [];
+        context.libReferenceDirectives = [];
         context.amdDependencies = [];
         context.hasNoDefaultLib = false;
         context.pragmas.forEach(function (entryOrList, key) {
@@ -21648,6 +21756,7 @@ var ts;
                 case "reference": {
                     var referencedFiles_1 = context.referencedFiles;
                     var typeReferenceDirectives_1 = context.typeReferenceDirectives;
+                    var libReferenceDirectives_1 = context.libReferenceDirectives;
                     ts.forEach(ts.toArray(entryOrList), function (arg) {
                         // TODO: GH#18217
                         if (arg.arguments["no-default-lib"]) {
@@ -21656,6 +21765,9 @@ var ts;
                         else if (arg.arguments.types) {
                             typeReferenceDirectives_1.push({ pos: arg.arguments.types.pos, end: arg.arguments.types.end, fileName: arg.arguments.types.value });
                         }
+                        else if (arg.arguments.lib) {
+                            libReferenceDirectives_1.push({ pos: arg.arguments.lib.pos, end: arg.arguments.lib.end, fileName: arg.arguments.lib.value });
+                        }
                         else if (arg.arguments.path) {
                             referencedFiles_1.push({ pos: arg.arguments.path.pos, end: arg.arguments.path.end, fileName: arg.arguments.path.value });
                         }
@@ -21819,6 +21931,3408 @@ var ts;
     }
     ts.tagNamesAreEquivalent = tagNamesAreEquivalent;
 })(ts || (ts = {}));
+var ts;
+(function (ts) {
+    /* @internal */
+    ts.compileOnSaveCommandLineOption = { name: "compileOnSave", type: "boolean" };
+    // NOTE: The order here is important to default lib ordering as entries will have the same
+    //       order in the generated program (see `getDefaultLibPriority` in program.ts). This
+    //       order also affects overload resolution when a type declared in one lib is
+    //       augmented in another lib.
+    var libEntries = [
+        // JavaScript only
+        ["es5", "lib.es5.d.ts"],
+        ["es6", "lib.es2015.d.ts"],
+        ["es2015", "lib.es2015.d.ts"],
+        ["es7", "lib.es2016.d.ts"],
+        ["es2016", "lib.es2016.d.ts"],
+        ["es2017", "lib.es2017.d.ts"],
+        ["es2018", "lib.es2018.d.ts"],
+        ["esnext", "lib.esnext.d.ts"],
+        // Host only
+        ["dom", "lib.dom.d.ts"],
+        ["dom.iterable", "lib.dom.iterable.d.ts"],
+        ["webworker", "lib.webworker.d.ts"],
+        ["webworker.importscripts", "lib.webworker.importscripts.d.ts"],
+        ["scripthost", "lib.scripthost.d.ts"],
+        // ES2015 Or ESNext By-feature options
+        ["es2015.core", "lib.es2015.core.d.ts"],
+        ["es2015.collection", "lib.es2015.collection.d.ts"],
+        ["es2015.generator", "lib.es2015.generator.d.ts"],
+        ["es2015.iterable", "lib.es2015.iterable.d.ts"],
+        ["es2015.promise", "lib.es2015.promise.d.ts"],
+        ["es2015.proxy", "lib.es2015.proxy.d.ts"],
+        ["es2015.reflect", "lib.es2015.reflect.d.ts"],
+        ["es2015.symbol", "lib.es2015.symbol.d.ts"],
+        ["es2015.symbol.wellknown", "lib.es2015.symbol.wellknown.d.ts"],
+        ["es2016.array.include", "lib.es2016.array.include.d.ts"],
+        ["es2017.object", "lib.es2017.object.d.ts"],
+        ["es2017.sharedmemory", "lib.es2017.sharedmemory.d.ts"],
+        ["es2017.string", "lib.es2017.string.d.ts"],
+        ["es2017.intl", "lib.es2017.intl.d.ts"],
+        ["es2017.typedarrays", "lib.es2017.typedarrays.d.ts"],
+        ["es2018.intl", "lib.es2018.intl.d.ts"],
+        ["es2018.promise", "lib.es2018.promise.d.ts"],
+        ["es2018.regexp", "lib.es2018.regexp.d.ts"],
+        ["esnext.array", "lib.esnext.array.d.ts"],
+        ["esnext.symbol", "lib.esnext.symbol.d.ts"],
+        ["esnext.asynciterable", "lib.esnext.asynciterable.d.ts"],
+    ];
+    /**
+     * An array of supported "lib" reference file names used to determine the order for inclusion
+     * when referenced, as well as for spelling suggestions. This ensures the correct ordering for
+     * overload resolution when a type declared in one lib is extended by another.
+     */
+    /* @internal */
+    ts.libs = libEntries.map(function (entry) { return entry[0]; });
+    /**
+     * A map of lib names to lib files. This map is used both for parsing the "lib" command line
+     * option as well as for resolving lib reference directives.
+     */
+    /* @internal */
+    ts.libMap = ts.createMapFromEntries(libEntries);
+    /* @internal */
+    ts.optionDeclarations = [
+        // CommandLine only options
+        {
+            name: "help",
+            shortName: "h",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Command_line_Options,
+            description: ts.Diagnostics.Print_this_message,
+        },
+        {
+            name: "help",
+            shortName: "?",
+            type: "boolean"
+        },
+        {
+            name: "all",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Command_line_Options,
+            description: ts.Diagnostics.Show_all_compiler_options,
+        },
+        {
+            name: "version",
+            shortName: "v",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Command_line_Options,
+            description: ts.Diagnostics.Print_the_compiler_s_version,
+        },
+        {
+            name: "init",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Command_line_Options,
+            description: ts.Diagnostics.Initializes_a_TypeScript_project_and_creates_a_tsconfig_json_file,
+        },
+        {
+            name: "project",
+            shortName: "p",
+            type: "string",
+            isFilePath: true,
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Command_line_Options,
+            paramType: ts.Diagnostics.FILE_OR_DIRECTORY,
+            description: ts.Diagnostics.Compile_the_project_given_the_path_to_its_configuration_file_or_to_a_folder_with_a_tsconfig_json,
+        },
+        {
+            name: "build",
+            type: "boolean",
+            shortName: "b",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Command_line_Options,
+            description: ts.Diagnostics.Build_one_or_more_projects_and_their_dependencies_if_out_of_date
+        },
+        {
+            name: "pretty",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Command_line_Options,
+            description: ts.Diagnostics.Stylize_errors_and_messages_using_color_and_context_experimental
+        },
+        {
+            name: "preserveWatchOutput",
+            type: "boolean",
+            showInSimplifiedHelpView: false,
+            category: ts.Diagnostics.Command_line_Options,
+            description: ts.Diagnostics.Whether_to_keep_outdated_console_output_in_watch_mode_instead_of_clearing_the_screen,
+        },
+        {
+            name: "watch",
+            shortName: "w",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Command_line_Options,
+            description: ts.Diagnostics.Watch_input_files,
+        },
+        // Basic
+        {
+            name: "target",
+            shortName: "t",
+            type: ts.createMapFromTemplate({
+                es3: 0 /* ES3 */,
+                es5: 1 /* ES5 */,
+                es6: 2 /* ES2015 */,
+                es2015: 2 /* ES2015 */,
+                es2016: 3 /* ES2016 */,
+                es2017: 4 /* ES2017 */,
+                es2018: 5 /* ES2018 */,
+                esnext: 6 /* ESNext */,
+            }),
+            paramType: ts.Diagnostics.VERSION,
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Specify_ECMAScript_target_version_Colon_ES3_default_ES5_ES2015_ES2016_ES2017_ES2018_or_ESNEXT,
+        },
+        {
+            name: "module",
+            shortName: "m",
+            type: ts.createMapFromTemplate({
+                none: ts.ModuleKind.None,
+                commonjs: ts.ModuleKind.CommonJS,
+                amd: ts.ModuleKind.AMD,
+                system: ts.ModuleKind.System,
+                umd: ts.ModuleKind.UMD,
+                es6: ts.ModuleKind.ES2015,
+                es2015: ts.ModuleKind.ES2015,
+                esnext: ts.ModuleKind.ESNext
+            }),
+            paramType: ts.Diagnostics.KIND,
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Specify_module_code_generation_Colon_none_commonjs_amd_system_umd_es2015_or_ESNext,
+        },
+        {
+            name: "lib",
+            type: "list",
+            element: {
+                name: "lib",
+                type: ts.libMap
+            },
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Specify_library_files_to_be_included_in_the_compilation
+        },
+        {
+            name: "allowJs",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Allow_javascript_files_to_be_compiled
+        },
+        {
+            name: "checkJs",
+            type: "boolean",
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Report_errors_in_js_files
+        },
+        {
+            name: "jsx",
+            type: ts.createMapFromTemplate({
+                "preserve": 1 /* Preserve */,
+                "react-native": 3 /* ReactNative */,
+                "react": 2 /* React */
+            }),
+            paramType: ts.Diagnostics.KIND,
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Specify_JSX_code_generation_Colon_preserve_react_native_or_react,
+        },
+        {
+            name: "declaration",
+            shortName: "d",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Generates_corresponding_d_ts_file,
+        },
+        {
+            name: "declarationMap",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Generates_a_sourcemap_for_each_corresponding_d_ts_file,
+        },
+        {
+            name: "emitDeclarationOnly",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Only_emit_d_ts_declaration_files,
+        },
+        {
+            name: "sourceMap",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Generates_corresponding_map_file,
+        },
+        {
+            name: "outFile",
+            type: "string",
+            isFilePath: true,
+            paramType: ts.Diagnostics.FILE,
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Concatenate_and_emit_output_to_single_file,
+        },
+        {
+            name: "outDir",
+            type: "string",
+            isFilePath: true,
+            paramType: ts.Diagnostics.DIRECTORY,
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Redirect_output_structure_to_the_directory,
+        },
+        {
+            name: "rootDir",
+            type: "string",
+            isFilePath: true,
+            paramType: ts.Diagnostics.LOCATION,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Specify_the_root_directory_of_input_files_Use_to_control_the_output_directory_structure_with_outDir,
+        },
+        {
+            name: "composite",
+            type: "boolean",
+            isTSConfigOnly: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Enable_project_compilation,
+        },
+        {
+            name: "removeComments",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Do_not_emit_comments_to_output,
+        },
+        {
+            name: "noEmit",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Do_not_emit_outputs,
+        },
+        {
+            name: "importHelpers",
+            type: "boolean",
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Import_emit_helpers_from_tslib
+        },
+        {
+            name: "downlevelIteration",
+            type: "boolean",
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Provide_full_support_for_iterables_in_for_of_spread_and_destructuring_when_targeting_ES5_or_ES3
+        },
+        {
+            name: "isolatedModules",
+            type: "boolean",
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Transpile_each_file_as_a_separate_module_similar_to_ts_transpileModule
+        },
+        // Strict Type Checks
+        {
+            name: "strict",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Strict_Type_Checking_Options,
+            description: ts.Diagnostics.Enable_all_strict_type_checking_options
+        },
+        {
+            name: "noImplicitAny",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Strict_Type_Checking_Options,
+            description: ts.Diagnostics.Raise_error_on_expressions_and_declarations_with_an_implied_any_type,
+        },
+        {
+            name: "strictNullChecks",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Strict_Type_Checking_Options,
+            description: ts.Diagnostics.Enable_strict_null_checks
+        },
+        {
+            name: "strictFunctionTypes",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Strict_Type_Checking_Options,
+            description: ts.Diagnostics.Enable_strict_checking_of_function_types
+        },
+        {
+            name: "strictPropertyInitialization",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Strict_Type_Checking_Options,
+            description: ts.Diagnostics.Enable_strict_checking_of_property_initialization_in_classes
+        },
+        {
+            name: "noImplicitThis",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Strict_Type_Checking_Options,
+            description: ts.Diagnostics.Raise_error_on_this_expressions_with_an_implied_any_type,
+        },
+        {
+            name: "alwaysStrict",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Strict_Type_Checking_Options,
+            description: ts.Diagnostics.Parse_in_strict_mode_and_emit_use_strict_for_each_source_file
+        },
+        // Additional Checks
+        {
+            name: "noUnusedLocals",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Additional_Checks,
+            description: ts.Diagnostics.Report_errors_on_unused_locals,
+        },
+        {
+            name: "noUnusedParameters",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Additional_Checks,
+            description: ts.Diagnostics.Report_errors_on_unused_parameters,
+        },
+        {
+            name: "noImplicitReturns",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Additional_Checks,
+            description: ts.Diagnostics.Report_error_when_not_all_code_paths_in_function_return_a_value
+        },
+        {
+            name: "noFallthroughCasesInSwitch",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Additional_Checks,
+            description: ts.Diagnostics.Report_errors_for_fallthrough_cases_in_switch_statement
+        },
+        // Module Resolution
+        {
+            name: "moduleResolution",
+            type: ts.createMapFromTemplate({
+                node: ts.ModuleResolutionKind.NodeJs,
+                classic: ts.ModuleResolutionKind.Classic,
+            }),
+            paramType: ts.Diagnostics.STRATEGY,
+            category: ts.Diagnostics.Module_Resolution_Options,
+            description: ts.Diagnostics.Specify_module_resolution_strategy_Colon_node_Node_js_or_classic_TypeScript_pre_1_6,
+        },
+        {
+            name: "baseUrl",
+            type: "string",
+            isFilePath: true,
+            category: ts.Diagnostics.Module_Resolution_Options,
+            description: ts.Diagnostics.Base_directory_to_resolve_non_absolute_module_names
+        },
+        {
+            // this option can only be specified in tsconfig.json
+            // use type = object to copy the value as-is
+            name: "paths",
+            type: "object",
+            isTSConfigOnly: true,
+            category: ts.Diagnostics.Module_Resolution_Options,
+            description: ts.Diagnostics.A_series_of_entries_which_re_map_imports_to_lookup_locations_relative_to_the_baseUrl
+        },
+        {
+            // this option can only be specified in tsconfig.json
+            // use type = object to copy the value as-is
+            name: "rootDirs",
+            type: "list",
+            isTSConfigOnly: true,
+            element: {
+                name: "rootDirs",
+                type: "string",
+                isFilePath: true
+            },
+            category: ts.Diagnostics.Module_Resolution_Options,
+            description: ts.Diagnostics.List_of_root_folders_whose_combined_content_represents_the_structure_of_the_project_at_runtime
+        },
+        {
+            name: "typeRoots",
+            type: "list",
+            element: {
+                name: "typeRoots",
+                type: "string",
+                isFilePath: true
+            },
+            category: ts.Diagnostics.Module_Resolution_Options,
+            description: ts.Diagnostics.List_of_folders_to_include_type_definitions_from
+        },
+        {
+            name: "types",
+            type: "list",
+            element: {
+                name: "types",
+                type: "string"
+            },
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Module_Resolution_Options,
+            description: ts.Diagnostics.Type_declaration_files_to_be_included_in_compilation
+        },
+        {
+            name: "allowSyntheticDefaultImports",
+            type: "boolean",
+            category: ts.Diagnostics.Module_Resolution_Options,
+            description: ts.Diagnostics.Allow_default_imports_from_modules_with_no_default_export_This_does_not_affect_code_emit_just_typechecking
+        },
+        {
+            name: "esModuleInterop",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Module_Resolution_Options,
+            description: ts.Diagnostics.Enables_emit_interoperability_between_CommonJS_and_ES_Modules_via_creation_of_namespace_objects_for_all_imports_Implies_allowSyntheticDefaultImports
+        },
+        {
+            name: "preserveSymlinks",
+            type: "boolean",
+            category: ts.Diagnostics.Module_Resolution_Options,
+            description: ts.Diagnostics.Do_not_resolve_the_real_path_of_symlinks,
+        },
+        // Source Maps
+        {
+            name: "sourceRoot",
+            type: "string",
+            isFilePath: true,
+            paramType: ts.Diagnostics.LOCATION,
+            category: ts.Diagnostics.Source_Map_Options,
+            description: ts.Diagnostics.Specify_the_location_where_debugger_should_locate_TypeScript_files_instead_of_source_locations,
+        },
+        {
+            name: "mapRoot",
+            type: "string",
+            isFilePath: true,
+            paramType: ts.Diagnostics.LOCATION,
+            category: ts.Diagnostics.Source_Map_Options,
+            description: ts.Diagnostics.Specify_the_location_where_debugger_should_locate_map_files_instead_of_generated_locations,
+        },
+        {
+            name: "inlineSourceMap",
+            type: "boolean",
+            category: ts.Diagnostics.Source_Map_Options,
+            description: ts.Diagnostics.Emit_a_single_file_with_source_maps_instead_of_having_a_separate_file
+        },
+        {
+            name: "inlineSources",
+            type: "boolean",
+            category: ts.Diagnostics.Source_Map_Options,
+            description: ts.Diagnostics.Emit_the_source_alongside_the_sourcemaps_within_a_single_file_requires_inlineSourceMap_or_sourceMap_to_be_set
+        },
+        // Experimental
+        {
+            name: "experimentalDecorators",
+            type: "boolean",
+            category: ts.Diagnostics.Experimental_Options,
+            description: ts.Diagnostics.Enables_experimental_support_for_ES7_decorators
+        },
+        {
+            name: "emitDecoratorMetadata",
+            type: "boolean",
+            category: ts.Diagnostics.Experimental_Options,
+            description: ts.Diagnostics.Enables_experimental_support_for_emitting_type_metadata_for_decorators
+        },
+        // Advanced
+        {
+            name: "jsxFactory",
+            type: "string",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Specify_the_JSX_factory_function_to_use_when_targeting_react_JSX_emit_e_g_React_createElement_or_h
+        },
+        {
+            name: "diagnostics",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Show_diagnostic_information
+        },
+        {
+            name: "extendedDiagnostics",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Show_verbose_diagnostic_information
+        },
+        {
+            name: "traceResolution",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Enable_tracing_of_the_name_resolution_process
+        },
+        {
+            name: "resolveJsonModule",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Include_modules_imported_with_json_extension
+        },
+        {
+            name: "listFiles",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Print_names_of_files_part_of_the_compilation
+        },
+        {
+            name: "listEmittedFiles",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Print_names_of_generated_files_part_of_the_compilation
+        },
+        {
+            name: "out",
+            type: "string",
+            isFilePath: false,
+            // for correct behaviour, please use outFile
+            category: ts.Diagnostics.Advanced_Options,
+            paramType: ts.Diagnostics.FILE,
+            description: ts.Diagnostics.Deprecated_Use_outFile_instead_Concatenate_and_emit_output_to_single_file,
+        },
+        {
+            name: "reactNamespace",
+            type: "string",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Deprecated_Use_jsxFactory_instead_Specify_the_object_invoked_for_createElement_when_targeting_react_JSX_emit
+        },
+        {
+            name: "skipDefaultLibCheck",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Deprecated_Use_skipLibCheck_instead_Skip_type_checking_of_default_library_declaration_files
+        },
+        {
+            name: "charset",
+            type: "string",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.The_character_set_of_the_input_files
+        },
+        {
+            name: "emitBOM",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Emit_a_UTF_8_Byte_Order_Mark_BOM_in_the_beginning_of_output_files
+        },
+        {
+            name: "locale",
+            type: "string",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.The_locale_used_when_displaying_messages_to_the_user_e_g_en_us
+        },
+        {
+            name: "newLine",
+            type: ts.createMapFromTemplate({
+                crlf: 0 /* CarriageReturnLineFeed */,
+                lf: 1 /* LineFeed */
+            }),
+            paramType: ts.Diagnostics.NEWLINE,
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Specify_the_end_of_line_sequence_to_be_used_when_emitting_files_Colon_CRLF_dos_or_LF_unix,
+        },
+        {
+            name: "noErrorTruncation",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Do_not_truncate_error_messages
+        },
+        {
+            name: "noLib",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Do_not_include_the_default_library_file_lib_d_ts
+        },
+        {
+            name: "noResolve",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Do_not_add_triple_slash_references_or_imported_modules_to_the_list_of_compiled_files
+        },
+        {
+            name: "stripInternal",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Do_not_emit_declarations_for_code_that_has_an_internal_annotation,
+        },
+        {
+            name: "disableSizeLimit",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Disable_size_limitations_on_JavaScript_projects
+        },
+        {
+            name: "noImplicitUseStrict",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Do_not_emit_use_strict_directives_in_module_output
+        },
+        {
+            name: "noEmitHelpers",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Do_not_generate_custom_helper_functions_like_extends_in_compiled_output
+        },
+        {
+            name: "noEmitOnError",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Do_not_emit_outputs_if_any_errors_were_reported,
+        },
+        {
+            name: "preserveConstEnums",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Do_not_erase_const_enum_declarations_in_generated_code
+        },
+        {
+            name: "declarationDir",
+            type: "string",
+            isFilePath: true,
+            paramType: ts.Diagnostics.DIRECTORY,
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Output_directory_for_generated_declaration_files
+        },
+        {
+            name: "skipLibCheck",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Skip_type_checking_of_declaration_files,
+        },
+        {
+            name: "allowUnusedLabels",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Do_not_report_errors_on_unused_labels
+        },
+        {
+            name: "allowUnreachableCode",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Do_not_report_errors_on_unreachable_code
+        },
+        {
+            name: "suppressExcessPropertyErrors",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Suppress_excess_property_checks_for_object_literals,
+        },
+        {
+            name: "suppressImplicitAnyIndexErrors",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Suppress_noImplicitAny_errors_for_indexing_objects_lacking_index_signatures,
+        },
+        {
+            name: "forceConsistentCasingInFileNames",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Disallow_inconsistently_cased_references_to_the_same_file
+        },
+        {
+            name: "maxNodeModuleJsDepth",
+            type: "number",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.The_maximum_dependency_depth_to_search_under_node_modules_and_load_JavaScript_files
+        },
+        {
+            name: "noStrictGenericChecks",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Disable_strict_checking_of_generic_signatures_in_function_types,
+        },
+        {
+            name: "keyofStringsOnly",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Resolve_keyof_to_string_valued_property_names_only_no_numbers_or_symbols,
+        },
+        {
+            // A list of plugins to load in the language service
+            name: "plugins",
+            type: "list",
+            isTSConfigOnly: true,
+            element: {
+                name: "plugin",
+                type: "object"
+            },
+            description: ts.Diagnostics.List_of_language_service_plugins
+        }
+    ];
+    /* @internal */
+    ts.typeAcquisitionDeclarations = [
+        {
+            /* @deprecated typingOptions.enableAutoDiscovery
+             * Use typeAcquisition.enable instead.
+             */
+            name: "enableAutoDiscovery",
+            type: "boolean",
+        },
+        {
+            name: "enable",
+            type: "boolean",
+        },
+        {
+            name: "include",
+            type: "list",
+            element: {
+                name: "include",
+                type: "string"
+            }
+        },
+        {
+            name: "exclude",
+            type: "list",
+            element: {
+                name: "exclude",
+                type: "string"
+            }
+        }
+    ];
+    /* @internal */
+    ts.defaultInitCompilerOptions = {
+        module: ts.ModuleKind.CommonJS,
+        target: 1 /* ES5 */,
+        strict: true,
+        esModuleInterop: true
+    };
+    var optionNameMapCache;
+    /* @internal */
+    function convertEnableAutoDiscoveryToEnable(typeAcquisition) {
+        // Convert deprecated typingOptions.enableAutoDiscovery to typeAcquisition.enable
+        if (typeAcquisition && typeAcquisition.enableAutoDiscovery !== undefined && typeAcquisition.enable === undefined) {
+            return {
+                enable: typeAcquisition.enableAutoDiscovery,
+                include: typeAcquisition.include || [],
+                exclude: typeAcquisition.exclude || []
+            };
+        }
+        return typeAcquisition;
+    }
+    ts.convertEnableAutoDiscoveryToEnable = convertEnableAutoDiscoveryToEnable;
+    function getOptionNameMap() {
+        if (optionNameMapCache) {
+            return optionNameMapCache;
+        }
+        var optionNameMap = ts.createMap();
+        var shortOptionNames = ts.createMap();
+        ts.forEach(ts.optionDeclarations, function (option) {
+            optionNameMap.set(option.name.toLowerCase(), option);
+            if (option.shortName) {
+                shortOptionNames.set(option.shortName, option.name);
+            }
+        });
+        optionNameMapCache = { optionNameMap: optionNameMap, shortOptionNames: shortOptionNames };
+        return optionNameMapCache;
+    }
+    /* @internal */
+    function createCompilerDiagnosticForInvalidCustomType(opt) {
+        return createDiagnosticForInvalidCustomType(opt, ts.createCompilerDiagnostic);
+    }
+    ts.createCompilerDiagnosticForInvalidCustomType = createCompilerDiagnosticForInvalidCustomType;
+    function createDiagnosticForInvalidCustomType(opt, createDiagnostic) {
+        var namesOfType = ts.arrayFrom(opt.type.keys()).map(function (key) { return "'" + key + "'"; }).join(", ");
+        return createDiagnostic(ts.Diagnostics.Argument_for_0_option_must_be_Colon_1, "--" + opt.name, namesOfType);
+    }
+    /* @internal */
+    function parseCustomTypeOption(opt, value, errors) {
+        return convertJsonOptionOfCustomType(opt, trimString(value || ""), errors);
+    }
+    ts.parseCustomTypeOption = parseCustomTypeOption;
+    /* @internal */
+    function parseListTypeOption(opt, value, errors) {
+        if (value === void 0) { value = ""; }
+        value = trimString(value);
+        if (ts.startsWith(value, "-")) {
+            return undefined;
+        }
+        if (value === "") {
+            return [];
+        }
+        var values = value.split(",");
+        switch (opt.element.type) {
+            case "number":
+                return ts.map(values, parseInt);
+            case "string":
+                return ts.map(values, function (v) { return v || ""; });
+            default:
+                return ts.mapDefined(values, function (v) { return parseCustomTypeOption(opt.element, v, errors); });
+        }
+    }
+    ts.parseListTypeOption = parseListTypeOption;
+    function parseCommandLine(commandLine, readFile) {
+        var options = {};
+        var fileNames = [];
+        var projectReferences = undefined;
+        var errors = [];
+        parseStrings(commandLine);
+        return {
+            options: options,
+            fileNames: fileNames,
+            projectReferences: projectReferences,
+            errors: errors
+        };
+        function parseStrings(args) {
+            var i = 0;
+            while (i < args.length) {
+                var s = args[i];
+                i++;
+                if (s.charCodeAt(0) === 64 /* at */) {
+                    parseResponseFile(s.slice(1));
+                }
+                else if (s.charCodeAt(0) === 45 /* minus */) {
+                    var opt = getOptionFromName(s.slice(s.charCodeAt(1) === 45 /* minus */ ? 2 : 1), /*allowShort*/ true);
+                    if (opt) {
+                        if (opt.isTSConfigOnly) {
+                            errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Option_0_can_only_be_specified_in_tsconfig_json_file, opt.name));
+                        }
+                        else {
+                            // Check to see if no argument was provided (e.g. "--locale" is the last command-line argument).
+                            if (!args[i] && opt.type !== "boolean") {
+                                errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Compiler_option_0_expects_an_argument, opt.name));
+                            }
+                            switch (opt.type) {
+                                case "number":
+                                    options[opt.name] = parseInt(args[i]);
+                                    i++;
+                                    break;
+                                case "boolean":
+                                    // boolean flag has optional value true, false, others
+                                    var optValue = args[i];
+                                    options[opt.name] = optValue !== "false";
+                                    // consume next argument as boolean flag value
+                                    if (optValue === "false" || optValue === "true") {
+                                        i++;
+                                    }
+                                    break;
+                                case "string":
+                                    options[opt.name] = args[i] || "";
+                                    i++;
+                                    break;
+                                case "list":
+                                    var result = parseListTypeOption(opt, args[i], errors);
+                                    options[opt.name] = result || [];
+                                    if (result) {
+                                        i++;
+                                    }
+                                    break;
+                                // If not a primitive, the possible types are specified in what is effectively a map of options.
+                                default:
+                                    options[opt.name] = parseCustomTypeOption(opt, args[i], errors);
+                                    i++;
+                                    break;
+                            }
+                        }
+                    }
+                    else {
+                        errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Unknown_compiler_option_0, s));
+                    }
+                }
+                else {
+                    fileNames.push(s);
+                }
+            }
+        }
+        function parseResponseFile(fileName) {
+            var text = readFile ? readFile(fileName) : ts.sys.readFile(fileName);
+            if (!text) {
+                errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.File_0_not_found, fileName));
+                return;
+            }
+            var args = [];
+            var pos = 0;
+            while (true) {
+                while (pos < text.length && text.charCodeAt(pos) <= 32 /* space */)
+                    pos++;
+                if (pos >= text.length)
+                    break;
+                var start = pos;
+                if (text.charCodeAt(start) === 34 /* doubleQuote */) {
+                    pos++;
+                    while (pos < text.length && text.charCodeAt(pos) !== 34 /* doubleQuote */)
+                        pos++;
+                    if (pos < text.length) {
+                        args.push(text.substring(start + 1, pos));
+                        pos++;
+                    }
+                    else {
+                        errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Unterminated_quoted_string_in_response_file_0, fileName));
+                    }
+                }
+                else {
+                    while (text.charCodeAt(pos) > 32 /* space */)
+                        pos++;
+                    args.push(text.substring(start, pos));
+                }
+            }
+            parseStrings(args);
+        }
+    }
+    ts.parseCommandLine = parseCommandLine;
+    /** @internal */
+    function getOptionFromName(optionName, allowShort) {
+        if (allowShort === void 0) { allowShort = false; }
+        optionName = optionName.toLowerCase();
+        var _a = getOptionNameMap(), optionNameMap = _a.optionNameMap, shortOptionNames = _a.shortOptionNames;
+        // Try to translate short option names to their full equivalents.
+        if (allowShort) {
+            var short = shortOptionNames.get(optionName);
+            if (short !== undefined) {
+                optionName = short;
+            }
+        }
+        return optionNameMap.get(optionName);
+    }
+    ts.getOptionFromName = getOptionFromName;
+    function getDiagnosticText(_message) {
+        var _args = [];
+        for (var _i = 1; _i < arguments.length; _i++) {
+            _args[_i - 1] = arguments[_i];
+        }
+        var diagnostic = ts.createCompilerDiagnostic.apply(undefined, arguments);
+        return diagnostic.messageText;
+    }
+    /* @internal */
+    function printVersion() {
+        ts.sys.write(getDiagnosticText(ts.Diagnostics.Version_0, ts.version) + ts.sys.newLine);
+    }
+    ts.printVersion = printVersion;
+    /* @internal */
+    function printHelp(optionsList, syntaxPrefix) {
+        if (syntaxPrefix === void 0) { syntaxPrefix = ""; }
+        var output = [];
+        // We want to align our "syntax" and "examples" commands to a certain margin.
+        var syntaxLength = getDiagnosticText(ts.Diagnostics.Syntax_Colon_0, "").length;
+        var examplesLength = getDiagnosticText(ts.Diagnostics.Examples_Colon_0, "").length;
+        var marginLength = Math.max(syntaxLength, examplesLength);
+        // Build up the syntactic skeleton.
+        var syntax = makePadding(marginLength - syntaxLength);
+        syntax += "tsc " + syntaxPrefix + "[" + getDiagnosticText(ts.Diagnostics.options) + "] [" + getDiagnosticText(ts.Diagnostics.file) + "...]";
+        output.push(getDiagnosticText(ts.Diagnostics.Syntax_Colon_0, syntax));
+        output.push(ts.sys.newLine + ts.sys.newLine);
+        // Build up the list of examples.
+        var padding = makePadding(marginLength);
+        output.push(getDiagnosticText(ts.Diagnostics.Examples_Colon_0, makePadding(marginLength - examplesLength) + "tsc hello.ts") + ts.sys.newLine);
+        output.push(padding + "tsc --outFile file.js file.ts" + ts.sys.newLine);
+        output.push(padding + "tsc @args.txt" + ts.sys.newLine);
+        output.push(padding + "tsc --build tsconfig.json" + ts.sys.newLine);
+        output.push(ts.sys.newLine);
+        output.push(getDiagnosticText(ts.Diagnostics.Options_Colon) + ts.sys.newLine);
+        // We want our descriptions to align at the same column in our output,
+        // so we keep track of the longest option usage string.
+        marginLength = 0;
+        var usageColumn = []; // Things like "-d, --declaration" go in here.
+        var descriptionColumn = [];
+        var optionsDescriptionMap = ts.createMap(); // Map between option.description and list of option.type if it is a kind
+        for (var _i = 0, optionsList_1 = optionsList; _i < optionsList_1.length; _i++) {
+            var option = optionsList_1[_i];
+            // If an option lacks a description,
+            // it is not officially supported.
+            if (!option.description) {
+                continue;
+            }
+            var usageText_1 = " ";
+            if (option.shortName) {
+                usageText_1 += "-" + option.shortName;
+                usageText_1 += getParamType(option);
+                usageText_1 += ", ";
+            }
+            usageText_1 += "--" + option.name;
+            usageText_1 += getParamType(option);
+            usageColumn.push(usageText_1);
+            var description = void 0;
+            if (option.name === "lib") {
+                description = getDiagnosticText(option.description);
+                var element = option.element;
+                var typeMap = element.type;
+                optionsDescriptionMap.set(description, ts.arrayFrom(typeMap.keys()).map(function (key) { return "'" + key + "'"; }));
+            }
+            else {
+                description = getDiagnosticText(option.description);
+            }
+            descriptionColumn.push(description);
+            // Set the new margin for the description column if necessary.
+            marginLength = Math.max(usageText_1.length, marginLength);
+        }
+        // Special case that can't fit in the loop.
+        var usageText = " @<" + getDiagnosticText(ts.Diagnostics.file) + ">";
+        usageColumn.push(usageText);
+        descriptionColumn.push(getDiagnosticText(ts.Diagnostics.Insert_command_line_options_and_files_from_a_file));
+        marginLength = Math.max(usageText.length, marginLength);
+        // Print out each row, aligning all the descriptions on the same column.
+        for (var i = 0; i < usageColumn.length; i++) {
+            var usage = usageColumn[i];
+            var description = descriptionColumn[i];
+            var kindsList = optionsDescriptionMap.get(description);
+            output.push(usage + makePadding(marginLength - usage.length + 2) + description + ts.sys.newLine);
+            if (kindsList) {
+                output.push(makePadding(marginLength + 4));
+                for (var _a = 0, kindsList_1 = kindsList; _a < kindsList_1.length; _a++) {
+                    var kind = kindsList_1[_a];
+                    output.push(kind + " ");
+                }
+                output.push(ts.sys.newLine);
+            }
+        }
+        for (var _b = 0, output_1 = output; _b < output_1.length; _b++) {
+            var line = output_1[_b];
+            ts.sys.write(line);
+        }
+        return;
+        function getParamType(option) {
+            if (option.paramType !== undefined) {
+                return " " + getDiagnosticText(option.paramType);
+            }
+            return "";
+        }
+        function makePadding(paddingLength) {
+            return Array(paddingLength + 1).join(" ");
+        }
+    }
+    ts.printHelp = printHelp;
+    /**
+     * Reads the config file, reports errors if any and exits if the config file cannot be found
+     */
+    function getParsedCommandLineOfConfigFile(configFileName, optionsToExtend, host) {
+        var configFileText;
+        try {
+            configFileText = host.readFile(configFileName);
+        }
+        catch (e) {
+            var error = ts.createCompilerDiagnostic(ts.Diagnostics.Cannot_read_file_0_Colon_1, configFileName, e.message);
+            host.onUnRecoverableConfigFileDiagnostic(error);
+            return undefined;
+        }
+        if (!configFileText) {
+            var error = ts.createCompilerDiagnostic(ts.Diagnostics.File_0_not_found, configFileName);
+            host.onUnRecoverableConfigFileDiagnostic(error);
+            return undefined;
+        }
+        var result = ts.parseJsonText(configFileName, configFileText);
+        var cwd = host.getCurrentDirectory();
+        return parseJsonSourceFileConfigFileContent(result, host, ts.getNormalizedAbsolutePath(ts.getDirectoryPath(configFileName), cwd), optionsToExtend, ts.getNormalizedAbsolutePath(configFileName, cwd));
+    }
+    ts.getParsedCommandLineOfConfigFile = getParsedCommandLineOfConfigFile;
+    /**
+     * Read tsconfig.json file
+     * @param fileName The path to the config file
+     */
+    function readConfigFile(fileName, readFile) {
+        var textOrDiagnostic = tryReadFile(fileName, readFile);
+        return ts.isString(textOrDiagnostic) ? parseConfigFileTextToJson(fileName, textOrDiagnostic) : { config: {}, error: textOrDiagnostic };
+    }
+    ts.readConfigFile = readConfigFile;
+    /**
+     * Parse the text of the tsconfig.json file
+     * @param fileName The path to the config file
+     * @param jsonText The text of the config file
+     */
+    function parseConfigFileTextToJson(fileName, jsonText) {
+        var jsonSourceFile = ts.parseJsonText(fileName, jsonText);
+        return {
+            config: convertToObject(jsonSourceFile, jsonSourceFile.parseDiagnostics),
+            error: jsonSourceFile.parseDiagnostics.length ? jsonSourceFile.parseDiagnostics[0] : undefined
+        };
+    }
+    ts.parseConfigFileTextToJson = parseConfigFileTextToJson;
+    /**
+     * Read tsconfig.json file
+     * @param fileName The path to the config file
+     */
+    function readJsonConfigFile(fileName, readFile) {
+        var textOrDiagnostic = tryReadFile(fileName, readFile);
+        return ts.isString(textOrDiagnostic) ? ts.parseJsonText(fileName, textOrDiagnostic) : { parseDiagnostics: [textOrDiagnostic] };
+    }
+    ts.readJsonConfigFile = readJsonConfigFile;
+    function tryReadFile(fileName, readFile) {
+        var text;
+        try {
+            text = readFile(fileName);
+        }
+        catch (e) {
+            return ts.createCompilerDiagnostic(ts.Diagnostics.Cannot_read_file_0_Colon_1, fileName, e.message);
+        }
+        return text === undefined ? ts.createCompilerDiagnostic(ts.Diagnostics.The_specified_path_does_not_exist_Colon_0, fileName) : text;
+    }
+    function commandLineOptionsToMap(options) {
+        return ts.arrayToMap(options, function (option) { return option.name; });
+    }
+    var _tsconfigRootOptions;
+    function getTsconfigRootOptionsMap() {
+        if (_tsconfigRootOptions === undefined) {
+            _tsconfigRootOptions = {
+                name: undefined,
+                type: "object",
+                elementOptions: commandLineOptionsToMap([
+                    {
+                        name: "compilerOptions",
+                        type: "object",
+                        elementOptions: commandLineOptionsToMap(ts.optionDeclarations),
+                        extraKeyDiagnosticMessage: ts.Diagnostics.Unknown_compiler_option_0
+                    },
+                    {
+                        name: "typingOptions",
+                        type: "object",
+                        elementOptions: commandLineOptionsToMap(ts.typeAcquisitionDeclarations),
+                        extraKeyDiagnosticMessage: ts.Diagnostics.Unknown_type_acquisition_option_0
+                    },
+                    {
+                        name: "typeAcquisition",
+                        type: "object",
+                        elementOptions: commandLineOptionsToMap(ts.typeAcquisitionDeclarations),
+                        extraKeyDiagnosticMessage: ts.Diagnostics.Unknown_type_acquisition_option_0
+                    },
+                    {
+                        name: "extends",
+                        type: "string"
+                    },
+                    {
+                        name: "references",
+                        type: "list",
+                        element: {
+                            name: "references",
+                            type: "object"
+                        }
+                    },
+                    {
+                        name: "files",
+                        type: "list",
+                        element: {
+                            name: "files",
+                            type: "string"
+                        }
+                    },
+                    {
+                        name: "include",
+                        type: "list",
+                        element: {
+                            name: "include",
+                            type: "string"
+                        }
+                    },
+                    {
+                        name: "exclude",
+                        type: "list",
+                        element: {
+                            name: "exclude",
+                            type: "string"
+                        }
+                    },
+                    ts.compileOnSaveCommandLineOption
+                ])
+            };
+        }
+        return _tsconfigRootOptions;
+    }
+    /**
+     * Convert the json syntax tree into the json value
+     */
+    function convertToObject(sourceFile, errors) {
+        return convertToObjectWorker(sourceFile, errors, /*returnValue*/ true, /*knownRootOptions*/ undefined, /*jsonConversionNotifier*/ undefined);
+    }
+    ts.convertToObject = convertToObject;
+    /**
+     * Convert the json syntax tree into the json value and report errors
+     * This returns the json value (apart from checking errors) only if returnValue provided is true.
+     * Otherwise it just checks the errors and returns undefined
+     */
+    /*@internal*/
+    function convertToObjectWorker(sourceFile, errors, returnValue, knownRootOptions, jsonConversionNotifier) {
+        if (!sourceFile.statements.length) {
+            return returnValue ? {} : undefined;
+        }
+        return convertPropertyValueToJson(sourceFile.statements[0].expression, knownRootOptions);
+        function isRootOptionMap(knownOptions) {
+            return knownRootOptions && knownRootOptions.elementOptions === knownOptions;
+        }
+        function convertObjectLiteralExpressionToJson(node, knownOptions, extraKeyDiagnosticMessage, parentOption) {
+            var result = returnValue ? {} : undefined;
+            for (var _i = 0, _a = node.properties; _i < _a.length; _i++) {
+                var element = _a[_i];
+                if (element.kind !== 270 /* PropertyAssignment */) {
+                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, element, ts.Diagnostics.Property_assignment_expected));
+                    continue;
+                }
+                if (element.questionToken) {
+                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, element.questionToken, ts.Diagnostics._0_can_only_be_used_in_a_ts_file, "?"));
+                }
+                if (!isDoubleQuotedString(element.name)) {
+                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, element.name, ts.Diagnostics.String_literal_with_double_quotes_expected));
+                }
+                var keyText = ts.unescapeLeadingUnderscores(ts.getTextOfPropertyName(element.name));
+                var option = knownOptions ? knownOptions.get(keyText) : undefined;
+                if (extraKeyDiagnosticMessage && !option) {
+                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, element.name, extraKeyDiagnosticMessage, keyText));
+                }
+                var value = convertPropertyValueToJson(element.initializer, option);
+                if (typeof keyText !== "undefined") {
+                    if (returnValue) {
+                        result[keyText] = value;
+                    }
+                    // Notify key value set, if user asked for it
+                    if (jsonConversionNotifier &&
+                        // Current callbacks are only on known parent option or if we are setting values in the root
+                        (parentOption || isRootOptionMap(knownOptions))) {
+                        var isValidOptionValue = isCompilerOptionsValue(option, value);
+                        if (parentOption) {
+                            if (isValidOptionValue) {
+                                // Notify option set in the parent if its a valid option value
+                                jsonConversionNotifier.onSetValidOptionKeyValueInParent(parentOption, option, value);
+                            }
+                        }
+                        else if (isRootOptionMap(knownOptions)) {
+                            if (isValidOptionValue) {
+                                // Notify about the valid root key value being set
+                                jsonConversionNotifier.onSetValidOptionKeyValueInRoot(keyText, element.name, value, element.initializer);
+                            }
+                            else if (!option) {
+                                // Notify about the unknown root key value being set
+                                jsonConversionNotifier.onSetUnknownOptionKeyValueInRoot(keyText, element.name, value, element.initializer);
+                            }
+                        }
+                    }
+                }
+            }
+            return result;
+        }
+        function convertArrayLiteralExpressionToJson(elements, elementOption) {
+            return (returnValue ? elements.map : elements.forEach).call(elements, function (element) { return convertPropertyValueToJson(element, elementOption); });
+        }
+        function convertPropertyValueToJson(valueExpression, option) {
+            switch (valueExpression.kind) {
+                case 101 /* TrueKeyword */:
+                    reportInvalidOptionValue(option && option.type !== "boolean");
+                    return true;
+                case 86 /* FalseKeyword */:
+                    reportInvalidOptionValue(option && option.type !== "boolean");
+                    return false;
+                case 95 /* NullKeyword */:
+                    reportInvalidOptionValue(option && option.name === "extends"); // "extends" is the only option we don't allow null/undefined for
+                    return null; // tslint:disable-line:no-null-keyword
+                case 9 /* StringLiteral */:
+                    if (!isDoubleQuotedString(valueExpression)) {
+                        errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, valueExpression, ts.Diagnostics.String_literal_with_double_quotes_expected));
+                    }
+                    reportInvalidOptionValue(option && (ts.isString(option.type) && option.type !== "string"));
+                    var text = valueExpression.text;
+                    if (option && !ts.isString(option.type)) {
+                        var customOption = option;
+                        // Validate custom option type
+                        if (!customOption.type.has(text.toLowerCase())) {
+                            errors.push(createDiagnosticForInvalidCustomType(customOption, function (message, arg0, arg1) { return ts.createDiagnosticForNodeInSourceFile(sourceFile, valueExpression, message, arg0, arg1); }));
+                        }
+                    }
+                    return text;
+                case 8 /* NumericLiteral */:
+                    reportInvalidOptionValue(option && option.type !== "number");
+                    return Number(valueExpression.text);
+                case 198 /* PrefixUnaryExpression */:
+                    if (valueExpression.operator !== 38 /* MinusToken */ || valueExpression.operand.kind !== 8 /* NumericLiteral */) {
+                        break; // not valid JSON syntax
+                    }
+                    reportInvalidOptionValue(option && option.type !== "number");
+                    return -Number(valueExpression.operand.text);
+                case 184 /* ObjectLiteralExpression */:
+                    reportInvalidOptionValue(option && option.type !== "object");
+                    var objectLiteralExpression = valueExpression;
+                    // Currently having element option declaration in the tsconfig with type "object"
+                    // determines if it needs onSetValidOptionKeyValueInParent callback or not
+                    // At moment there are only "compilerOptions", "typeAcquisition" and "typingOptions"
+                    // that satifies it and need it to modify options set in them (for normalizing file paths)
+                    // vs what we set in the json
+                    // If need arises, we can modify this interface and callbacks as needed
+                    if (option) {
+                        var _a = option, elementOptions = _a.elementOptions, extraKeyDiagnosticMessage = _a.extraKeyDiagnosticMessage, optionName = _a.name;
+                        return convertObjectLiteralExpressionToJson(objectLiteralExpression, elementOptions, extraKeyDiagnosticMessage, optionName);
+                    }
+                    else {
+                        return convertObjectLiteralExpressionToJson(objectLiteralExpression, /* knownOptions*/ undefined, 
+                        /*extraKeyDiagnosticMessage */ undefined, /*parentOption*/ undefined);
+                    }
+                case 183 /* ArrayLiteralExpression */:
+                    reportInvalidOptionValue(option && option.type !== "list");
+                    return convertArrayLiteralExpressionToJson(valueExpression.elements, option && option.element);
+            }
+            // Not in expected format
+            if (option) {
+                reportInvalidOptionValue(/*isError*/ true);
+            }
+            else {
+                errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, valueExpression, ts.Diagnostics.Property_value_can_only_be_string_literal_numeric_literal_true_false_null_object_literal_or_array_literal));
+            }
+            return undefined;
+            function reportInvalidOptionValue(isError) {
+                if (isError) {
+                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, valueExpression, ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, option.name, getCompilerOptionValueTypeString(option)));
+                }
+            }
+        }
+        function isDoubleQuotedString(node) {
+            return ts.isStringLiteral(node) && ts.isStringDoubleQuoted(node, sourceFile);
+        }
+    }
+    ts.convertToObjectWorker = convertToObjectWorker;
+    function getCompilerOptionValueTypeString(option) {
+        return option.type === "list" ?
+            "Array" :
+            ts.isString(option.type) ? option.type : "string";
+    }
+    function isCompilerOptionsValue(option, value) {
+        if (option) {
+            if (isNullOrUndefined(value))
+                return true; // All options are undefinable/nullable
+            if (option.type === "list") {
+                return ts.isArray(value);
+            }
+            var expectedType = ts.isString(option.type) ? option.type : "string";
+            return typeof value === expectedType;
+        }
+        return false;
+    }
+    /**
+     * Generate tsconfig configuration when running command line "--init"
+     * @param options commandlineOptions to be generated into tsconfig.json
+     * @param fileNames array of filenames to be generated into tsconfig.json
+     */
+    /* @internal */
+    function generateTSConfig(options, fileNames, newLine) {
+        var compilerOptions = ts.extend(options, ts.defaultInitCompilerOptions);
+        var compilerOptionsMap = serializeCompilerOptions(compilerOptions);
+        return writeConfigurations();
+        function getCustomTypeMapOfCommandLineOption(optionDefinition) {
+            if (optionDefinition.type === "string" || optionDefinition.type === "number" || optionDefinition.type === "boolean") {
+                // this is of a type CommandLineOptionOfPrimitiveType
+                return undefined;
+            }
+            else if (optionDefinition.type === "list") {
+                return getCustomTypeMapOfCommandLineOption(optionDefinition.element);
+            }
+            else {
+                return optionDefinition.type;
+            }
+        }
+        function getNameOfCompilerOptionValue(value, customTypeMap) {
+            // There is a typeMap associated with this command-line option so use it to map value back to its name
+            return ts.forEachEntry(customTypeMap, function (mapValue, key) {
+                if (mapValue === value) {
+                    return key;
+                }
+            });
+        }
+        function serializeCompilerOptions(options) {
+            var result = ts.createMap();
+            var optionsNameMap = getOptionNameMap().optionNameMap;
+            var _loop_3 = function (name) {
+                if (ts.hasProperty(options, name)) {
+                    // tsconfig only options cannot be specified via command line,
+                    // so we can assume that only types that can appear here string | number | boolean
+                    if (optionsNameMap.has(name) && optionsNameMap.get(name).category === ts.Diagnostics.Command_line_Options) {
+                        return "continue";
+                    }
+                    var value = options[name];
+                    var optionDefinition = optionsNameMap.get(name.toLowerCase());
+                    if (optionDefinition) {
+                        var customTypeMap_1 = getCustomTypeMapOfCommandLineOption(optionDefinition);
+                        if (!customTypeMap_1) {
+                            // There is no map associated with this compiler option then use the value as-is
+                            // This is the case if the value is expect to be string, number, boolean or list of string
+                            result.set(name, value);
+                        }
+                        else {
+                            if (optionDefinition.type === "list") {
+                                result.set(name, value.map(function (element) { return getNameOfCompilerOptionValue(element, customTypeMap_1); })); // TODO: GH#18217
+                            }
+                            else {
+                                // There is a typeMap associated with this command-line option so use it to map value back to its name
+                                result.set(name, getNameOfCompilerOptionValue(value, customTypeMap_1));
+                            }
+                        }
+                    }
+                }
+            };
+            for (var name in options) {
+                _loop_3(name);
+            }
+            return result;
+        }
+        function getDefaultValueForOption(option) {
+            switch (option.type) {
+                case "number":
+                    return 1;
+                case "boolean":
+                    return true;
+                case "string":
+                    return option.isFilePath ? "./" : "";
+                case "list":
+                    return [];
+                case "object":
+                    return {};
+                default:
+                    return option.type.keys().next().value;
+            }
+        }
+        function makePadding(paddingLength) {
+            return Array(paddingLength + 1).join(" ");
+        }
+        function isAllowedOption(_a) {
+            var category = _a.category, name = _a.name;
+            // Skip options which do not have a category or have category `Command_line_Options`
+            // Exclude all possible `Advanced_Options` in tsconfig.json which were NOT defined in command line
+            return category !== undefined
+                && category !== ts.Diagnostics.Command_line_Options
+                && (category !== ts.Diagnostics.Advanced_Options || compilerOptionsMap.has(name));
+        }
+        function writeConfigurations() {
+            // Filter applicable options to place in the file
+            var categorizedOptions = ts.createMultiMap();
+            for (var _i = 0, optionDeclarations_1 = ts.optionDeclarations; _i < optionDeclarations_1.length; _i++) {
+                var option = optionDeclarations_1[_i];
+                var category = option.category;
+                if (isAllowedOption(option)) {
+                    categorizedOptions.add(ts.getLocaleSpecificMessage(category), option);
+                }
+            }
+            // Serialize all options and their descriptions
+            var marginLength = 0;
+            var seenKnownKeys = 0;
+            var nameColumn = [];
+            var descriptionColumn = [];
+            categorizedOptions.forEach(function (options, category) {
+                if (nameColumn.length !== 0) {
+                    nameColumn.push("");
+                    descriptionColumn.push("");
+                }
+                nameColumn.push("/* " + category + " */");
+                descriptionColumn.push("");
+                for (var _i = 0, options_1 = options; _i < options_1.length; _i++) {
+                    var option = options_1[_i];
+                    var optionName = void 0;
+                    if (compilerOptionsMap.has(option.name)) {
+                        optionName = "\"" + option.name + "\": " + JSON.stringify(compilerOptionsMap.get(option.name)) + ((seenKnownKeys += 1) === compilerOptionsMap.size ? "" : ",");
+                    }
+                    else {
+                        optionName = "// \"" + option.name + "\": " + JSON.stringify(getDefaultValueForOption(option)) + ",";
+                    }
+                    nameColumn.push(optionName);
+                    descriptionColumn.push("/* " + (option.description && ts.getLocaleSpecificMessage(option.description) || option.name) + " */");
+                    marginLength = Math.max(optionName.length, marginLength);
+                }
+            });
+            // Write the output
+            var tab = makePadding(2);
+            var result = [];
+            result.push("{");
+            result.push(tab + "\"compilerOptions\": {");
+            // Print out each row, aligning all the descriptions on the same column.
+            for (var i = 0; i < nameColumn.length; i++) {
+                var optionName = nameColumn[i];
+                var description = descriptionColumn[i];
+                result.push(optionName && "" + tab + tab + optionName + (description && (makePadding(marginLength - optionName.length + 2) + description)));
+            }
+            if (fileNames.length) {
+                result.push(tab + "},");
+                result.push(tab + "\"files\": [");
+                for (var i = 0; i < fileNames.length; i++) {
+                    result.push("" + tab + tab + JSON.stringify(fileNames[i]) + (i === fileNames.length - 1 ? "" : ","));
+                }
+                result.push(tab + "]");
+            }
+            else {
+                result.push(tab + "}");
+            }
+            result.push("}");
+            return result.join(newLine);
+        }
+    }
+    ts.generateTSConfig = generateTSConfig;
+    /**
+     * Parse the contents of a config file (tsconfig.json).
+     * @param json The contents of the config file to parse
+     * @param host Instance of ParseConfigHost used to enumerate files in folder.
+     * @param basePath A root directory to resolve relative path entries in the config
+     *    file to. e.g. outDir
+     */
+    function parseJsonConfigFileContent(json, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions) {
+        return parseJsonConfigFileContentWorker(json, /*sourceFile*/ undefined, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions);
+    }
+    ts.parseJsonConfigFileContent = parseJsonConfigFileContent;
+    /**
+     * Parse the contents of a config file (tsconfig.json).
+     * @param jsonNode The contents of the config file to parse
+     * @param host Instance of ParseConfigHost used to enumerate files in folder.
+     * @param basePath A root directory to resolve relative path entries in the config
+     *    file to. e.g. outDir
+     */
+    function parseJsonSourceFileConfigFileContent(sourceFile, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions) {
+        return parseJsonConfigFileContentWorker(/*json*/ undefined, sourceFile, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions);
+    }
+    ts.parseJsonSourceFileConfigFileContent = parseJsonSourceFileConfigFileContent;
+    /*@internal*/
+    function setConfigFileInOptions(options, configFile) {
+        if (configFile) {
+            Object.defineProperty(options, "configFile", { enumerable: false, writable: false, value: configFile });
+        }
+    }
+    ts.setConfigFileInOptions = setConfigFileInOptions;
+    function isNullOrUndefined(x) {
+        // tslint:disable-next-line:no-null-keyword
+        return x === undefined || x === null;
+    }
+    function directoryOfCombinedPath(fileName, basePath) {
+        // Use the `getNormalizedAbsolutePath` function to avoid canonicalizing the path, as it must remain noncanonical
+        // until consistient casing errors are reported
+        return ts.getDirectoryPath(ts.getNormalizedAbsolutePath(fileName, basePath));
+    }
+    /**
+     * Parse the contents of a config file from json or json source file (tsconfig.json).
+     * @param json The contents of the config file to parse
+     * @param sourceFile sourceFile corresponding to the Json
+     * @param host Instance of ParseConfigHost used to enumerate files in folder.
+     * @param basePath A root directory to resolve relative path entries in the config
+     *    file to. e.g. outDir
+     * @param resolutionStack Only present for backwards-compatibility. Should be empty.
+     */
+    function parseJsonConfigFileContentWorker(json, sourceFile, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions) {
+        if (existingOptions === void 0) { existingOptions = {}; }
+        if (resolutionStack === void 0) { resolutionStack = []; }
+        if (extraFileExtensions === void 0) { extraFileExtensions = []; }
+        ts.Debug.assert((json === undefined && sourceFile !== undefined) || (json !== undefined && sourceFile === undefined));
+        var errors = [];
+        var parsedConfig = parseConfig(json, sourceFile, host, basePath, configFileName, resolutionStack, errors);
+        var raw = parsedConfig.raw;
+        var options = ts.extend(existingOptions, parsedConfig.options || {});
+        options.configFilePath = configFileName && ts.normalizeSlashes(configFileName);
+        setConfigFileInOptions(options, sourceFile);
+        var _a = getFileNames(), fileNames = _a.fileNames, wildcardDirectories = _a.wildcardDirectories, spec = _a.spec, projectReferences = _a.projectReferences;
+        return {
+            options: options,
+            fileNames: fileNames,
+            projectReferences: projectReferences,
+            typeAcquisition: parsedConfig.typeAcquisition || getDefaultTypeAcquisition(),
+            raw: raw,
+            errors: errors,
+            wildcardDirectories: wildcardDirectories,
+            compileOnSave: !!raw.compileOnSave,
+            configFileSpecs: spec
+        };
+        function getFileNames() {
+            var filesSpecs;
+            if (ts.hasProperty(raw, "files") && !isNullOrUndefined(raw.files)) {
+                if (ts.isArray(raw.files)) {
+                    filesSpecs = raw.files;
+                    if (filesSpecs.length === 0) {
+                        createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.The_files_list_in_config_file_0_is_empty, configFileName || "tsconfig.json");
+                    }
+                }
+                else {
+                    createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "files", "Array");
+                }
+            }
+            var includeSpecs;
+            if (ts.hasProperty(raw, "include") && !isNullOrUndefined(raw.include)) {
+                if (ts.isArray(raw.include)) {
+                    includeSpecs = raw.include;
+                }
+                else {
+                    createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "include", "Array");
+                }
+            }
+            var excludeSpecs;
+            if (ts.hasProperty(raw, "exclude") && !isNullOrUndefined(raw.exclude)) {
+                if (ts.isArray(raw.exclude)) {
+                    excludeSpecs = raw.exclude;
+                }
+                else {
+                    createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "exclude", "Array");
+                }
+            }
+            else if (raw.compilerOptions) {
+                var outDir = raw.compilerOptions.outDir;
+                var declarationDir = raw.compilerOptions.declarationDir;
+                if (outDir || declarationDir) {
+                    excludeSpecs = [outDir, declarationDir].filter(function (d) { return !!d; });
+                }
+            }
+            if (filesSpecs === undefined && includeSpecs === undefined) {
+                includeSpecs = ["**/*"];
+            }
+            var result = matchFileNames(filesSpecs, includeSpecs, excludeSpecs, configFileName ? directoryOfCombinedPath(configFileName, basePath) : basePath, options, host, errors, extraFileExtensions, sourceFile);
+            if (result.fileNames.length === 0 && !ts.hasProperty(raw, "files") && resolutionStack.length === 0 && !ts.hasProperty(raw, "references")) {
+                errors.push(getErrorForNoInputFiles(result.spec, configFileName));
+            }
+            if (ts.hasProperty(raw, "references") && !isNullOrUndefined(raw.references)) {
+                if (ts.isArray(raw.references)) {
+                    var references = [];
+                    for (var _i = 0, _a = raw.references; _i < _a.length; _i++) {
+                        var ref = _a[_i];
+                        if (typeof ref.path !== "string") {
+                            createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "reference.path", "string");
+                        }
+                        else {
+                            references.push({
+                                path: ts.getNormalizedAbsolutePath(ref.path, basePath),
+                                originalPath: ref.path,
+                                prepend: ref.prepend,
+                                circular: ref.circular
+                            });
+                        }
+                    }
+                    result.projectReferences = references;
+                }
+                else {
+                    createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "references", "Array");
+                }
+            }
+            return result;
+        }
+        function createCompilerDiagnosticOnlyIfJson(message, arg0, arg1) {
+            if (!sourceFile) {
+                errors.push(ts.createCompilerDiagnostic(message, arg0, arg1));
+            }
+        }
+    }
+    /*@internal*/
+    function isErrorNoInputFiles(error) {
+        return error.code === ts.Diagnostics.No_inputs_were_found_in_config_file_0_Specified_include_paths_were_1_and_exclude_paths_were_2.code;
+    }
+    ts.isErrorNoInputFiles = isErrorNoInputFiles;
+    /*@internal*/
+    function getErrorForNoInputFiles(_a, configFileName) {
+        var includeSpecs = _a.includeSpecs, excludeSpecs = _a.excludeSpecs;
+        return ts.createCompilerDiagnostic(ts.Diagnostics.No_inputs_were_found_in_config_file_0_Specified_include_paths_were_1_and_exclude_paths_were_2, configFileName || "tsconfig.json", JSON.stringify(includeSpecs || []), JSON.stringify(excludeSpecs || []));
+    }
+    ts.getErrorForNoInputFiles = getErrorForNoInputFiles;
+    function isSuccessfulParsedTsconfig(value) {
+        return !!value.options;
+    }
+    /**
+     * This *just* extracts options/include/exclude/files out of a config file.
+     * It does *not* resolve the included files.
+     */
+    function parseConfig(json, sourceFile, host, basePath, configFileName, resolutionStack, errors) {
+        basePath = ts.normalizeSlashes(basePath);
+        var resolvedPath = ts.getNormalizedAbsolutePath(configFileName || "", basePath);
+        if (resolutionStack.indexOf(resolvedPath) >= 0) {
+            errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Circularity_detected_while_resolving_configuration_Colon_0, resolutionStack.concat([resolvedPath]).join(" -> ")));
+            return { raw: json || convertToObject(sourceFile, errors) };
+        }
+        var ownConfig = json ?
+            parseOwnConfigOfJson(json, host, basePath, configFileName, errors) :
+            parseOwnConfigOfJsonSourceFile(sourceFile, host, basePath, configFileName, errors);
+        if (ownConfig.extendedConfigPath) {
+            // copy the resolution stack so it is never reused between branches in potential diamond-problem scenarios.
+            resolutionStack = resolutionStack.concat([resolvedPath]);
+            var extendedConfig = getExtendedConfig(sourceFile, ownConfig.extendedConfigPath, host, basePath, resolutionStack, errors);
+            if (extendedConfig && isSuccessfulParsedTsconfig(extendedConfig)) {
+                var baseRaw_1 = extendedConfig.raw;
+                var raw_1 = ownConfig.raw;
+                var setPropertyInRawIfNotUndefined = function (propertyName) {
+                    var value = raw_1[propertyName] || baseRaw_1[propertyName];
+                    if (value) {
+                        raw_1[propertyName] = value;
+                    }
+                };
+                setPropertyInRawIfNotUndefined("include");
+                setPropertyInRawIfNotUndefined("exclude");
+                setPropertyInRawIfNotUndefined("files");
+                if (raw_1.compileOnSave === undefined) {
+                    raw_1.compileOnSave = baseRaw_1.compileOnSave;
+                }
+                ownConfig.options = ts.assign({}, extendedConfig.options, ownConfig.options);
+                // TODO extend type typeAcquisition
+            }
+        }
+        return ownConfig;
+    }
+    function parseOwnConfigOfJson(json, host, basePath, configFileName, errors) {
+        if (ts.hasProperty(json, "excludes")) {
+            errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Unknown_option_excludes_Did_you_mean_exclude));
+        }
+        var options = convertCompilerOptionsFromJsonWorker(json.compilerOptions, basePath, errors, configFileName);
+        // typingOptions has been deprecated and is only supported for backward compatibility purposes.
+        // It should be removed in future releases - use typeAcquisition instead.
+        var typeAcquisition = convertTypeAcquisitionFromJsonWorker(json.typeAcquisition || json.typingOptions, basePath, errors, configFileName);
+        json.compileOnSave = convertCompileOnSaveOptionFromJson(json, basePath, errors);
+        var extendedConfigPath;
+        if (json.extends) {
+            if (!ts.isString(json.extends)) {
+                errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "extends", "string"));
+            }
+            else {
+                var newBase = configFileName ? directoryOfCombinedPath(configFileName, basePath) : basePath;
+                extendedConfigPath = getExtendsConfigPath(json.extends, host, newBase, errors, ts.createCompilerDiagnostic);
+            }
+        }
+        return { raw: json, options: options, typeAcquisition: typeAcquisition, extendedConfigPath: extendedConfigPath };
+    }
+    function parseOwnConfigOfJsonSourceFile(sourceFile, host, basePath, configFileName, errors) {
+        var options = getDefaultCompilerOptions(configFileName);
+        var typeAcquisition, typingOptionstypeAcquisition;
+        var extendedConfigPath;
+        var optionsIterator = {
+            onSetValidOptionKeyValueInParent: function (parentOption, option, value) {
+                ts.Debug.assert(parentOption === "compilerOptions" || parentOption === "typeAcquisition" || parentOption === "typingOptions");
+                var currentOption = parentOption === "compilerOptions" ?
+                    options :
+                    parentOption === "typeAcquisition" ?
+                        (typeAcquisition || (typeAcquisition = getDefaultTypeAcquisition(configFileName))) :
+                        (typingOptionstypeAcquisition || (typingOptionstypeAcquisition = getDefaultTypeAcquisition(configFileName)));
+                currentOption[option.name] = normalizeOptionValue(option, basePath, value);
+            },
+            onSetValidOptionKeyValueInRoot: function (key, _keyNode, value, valueNode) {
+                switch (key) {
+                    case "extends":
+                        var newBase = configFileName ? directoryOfCombinedPath(configFileName, basePath) : basePath;
+                        extendedConfigPath = getExtendsConfigPath(value, host, newBase, errors, function (message, arg0) {
+                            return ts.createDiagnosticForNodeInSourceFile(sourceFile, valueNode, message, arg0);
+                        });
+                        return;
+                    case "files":
+                        if (value.length === 0) {
+                            errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, valueNode, ts.Diagnostics.The_files_list_in_config_file_0_is_empty, configFileName || "tsconfig.json"));
+                        }
+                        return;
+                }
+            },
+            onSetUnknownOptionKeyValueInRoot: function (key, keyNode, _value, _valueNode) {
+                if (key === "excludes") {
+                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, keyNode, ts.Diagnostics.Unknown_option_excludes_Did_you_mean_exclude));
+                }
+            }
+        };
+        var json = convertToObjectWorker(sourceFile, errors, /*returnValue*/ true, getTsconfigRootOptionsMap(), optionsIterator);
+        if (!typeAcquisition) {
+            if (typingOptionstypeAcquisition) {
+                typeAcquisition = (typingOptionstypeAcquisition.enableAutoDiscovery !== undefined) ?
+                    {
+                        enable: typingOptionstypeAcquisition.enableAutoDiscovery,
+                        include: typingOptionstypeAcquisition.include,
+                        exclude: typingOptionstypeAcquisition.exclude
+                    } :
+                    typingOptionstypeAcquisition;
+            }
+            else {
+                typeAcquisition = getDefaultTypeAcquisition(configFileName);
+            }
+        }
+        return { raw: json, options: options, typeAcquisition: typeAcquisition, extendedConfigPath: extendedConfigPath };
+    }
+    function getExtendsConfigPath(extendedConfig, host, basePath, errors, createDiagnostic) {
+        extendedConfig = ts.normalizeSlashes(extendedConfig);
+        // If the path isn't a rooted or relative path, don't try to resolve it (we reserve the right to special case module-id like paths in the future)
+        if (!(ts.isRootedDiskPath(extendedConfig) || ts.startsWith(extendedConfig, "./") || ts.startsWith(extendedConfig, "../"))) {
+            errors.push(createDiagnostic(ts.Diagnostics.A_path_in_an_extends_option_must_be_relative_or_rooted_but_0_is_not, extendedConfig));
+            return undefined;
+        }
+        var extendedConfigPath = ts.getNormalizedAbsolutePath(extendedConfig, basePath);
+        if (!host.fileExists(extendedConfigPath) && !ts.endsWith(extendedConfigPath, ".json" /* Json */)) {
+            extendedConfigPath = extendedConfigPath + ".json";
+            if (!host.fileExists(extendedConfigPath)) {
+                errors.push(createDiagnostic(ts.Diagnostics.File_0_does_not_exist, extendedConfig));
+                return undefined;
+            }
+        }
+        return extendedConfigPath;
+    }
+    function getExtendedConfig(sourceFile, extendedConfigPath, host, basePath, resolutionStack, errors) {
+        var _a;
+        var extendedResult = readJsonConfigFile(extendedConfigPath, function (path) { return host.readFile(path); });
+        if (sourceFile) {
+            (sourceFile.extendedSourceFiles || (sourceFile.extendedSourceFiles = [])).push(extendedResult.fileName);
+        }
+        if (extendedResult.parseDiagnostics.length) {
+            errors.push.apply(errors, extendedResult.parseDiagnostics);
+            return undefined;
+        }
+        var extendedDirname = ts.getDirectoryPath(extendedConfigPath);
+        var extendedConfig = parseConfig(/*json*/ undefined, extendedResult, host, extendedDirname, ts.getBaseFileName(extendedConfigPath), resolutionStack, errors);
+        if (sourceFile) {
+            (_a = sourceFile.extendedSourceFiles).push.apply(_a, extendedResult.extendedSourceFiles);
+        }
+        if (isSuccessfulParsedTsconfig(extendedConfig)) {
+            // Update the paths to reflect base path
+            var relativeDifference_1 = ts.convertToRelativePath(extendedDirname, basePath, ts.identity);
+            var updatePath_1 = function (path) { return ts.isRootedDiskPath(path) ? path : ts.combinePaths(relativeDifference_1, path); };
+            var mapPropertiesInRawIfNotUndefined = function (propertyName) {
+                if (raw_2[propertyName]) {
+                    raw_2[propertyName] = ts.map(raw_2[propertyName], updatePath_1);
+                }
+            };
+            var raw_2 = extendedConfig.raw;
+            mapPropertiesInRawIfNotUndefined("include");
+            mapPropertiesInRawIfNotUndefined("exclude");
+            mapPropertiesInRawIfNotUndefined("files");
+        }
+        return extendedConfig;
+    }
+    function convertCompileOnSaveOptionFromJson(jsonOption, basePath, errors) {
+        if (!ts.hasProperty(jsonOption, ts.compileOnSaveCommandLineOption.name)) {
+            return false;
+        }
+        var result = convertJsonOption(ts.compileOnSaveCommandLineOption, jsonOption.compileOnSave, basePath, errors);
+        return typeof result === "boolean" && result;
+    }
+    function convertCompilerOptionsFromJson(jsonOptions, basePath, configFileName) {
+        var errors = [];
+        var options = convertCompilerOptionsFromJsonWorker(jsonOptions, basePath, errors, configFileName);
+        return { options: options, errors: errors };
+    }
+    ts.convertCompilerOptionsFromJson = convertCompilerOptionsFromJson;
+    function convertTypeAcquisitionFromJson(jsonOptions, basePath, configFileName) {
+        var errors = [];
+        var options = convertTypeAcquisitionFromJsonWorker(jsonOptions, basePath, errors, configFileName);
+        return { options: options, errors: errors };
+    }
+    ts.convertTypeAcquisitionFromJson = convertTypeAcquisitionFromJson;
+    function getDefaultCompilerOptions(configFileName) {
+        var options = configFileName && ts.getBaseFileName(configFileName) === "jsconfig.json"
+            ? { allowJs: true, maxNodeModuleJsDepth: 2, allowSyntheticDefaultImports: true, skipLibCheck: true, noEmit: true }
+            : {};
+        return options;
+    }
+    function convertCompilerOptionsFromJsonWorker(jsonOptions, basePath, errors, configFileName) {
+        var options = getDefaultCompilerOptions(configFileName);
+        convertOptionsFromJson(ts.optionDeclarations, jsonOptions, basePath, options, ts.Diagnostics.Unknown_compiler_option_0, errors);
+        if (configFileName) {
+            options.configFilePath = ts.normalizeSlashes(configFileName);
+        }
+        return options;
+    }
+    function getDefaultTypeAcquisition(configFileName) {
+        return { enable: !!configFileName && ts.getBaseFileName(configFileName) === "jsconfig.json", include: [], exclude: [] };
+    }
+    function convertTypeAcquisitionFromJsonWorker(jsonOptions, basePath, errors, configFileName) {
+        var options = getDefaultTypeAcquisition(configFileName);
+        var typeAcquisition = convertEnableAutoDiscoveryToEnable(jsonOptions);
+        convertOptionsFromJson(ts.typeAcquisitionDeclarations, typeAcquisition, basePath, options, ts.Diagnostics.Unknown_type_acquisition_option_0, errors);
+        return options;
+    }
+    function convertOptionsFromJson(optionDeclarations, jsonOptions, basePath, defaultOptions, diagnosticMessage, errors) {
+        if (!jsonOptions) {
+            return;
+        }
+        var optionNameMap = commandLineOptionsToMap(optionDeclarations);
+        for (var id in jsonOptions) {
+            var opt = optionNameMap.get(id);
+            if (opt) {
+                defaultOptions[opt.name] = convertJsonOption(opt, jsonOptions[id], basePath, errors);
+            }
+            else {
+                errors.push(ts.createCompilerDiagnostic(diagnosticMessage, id));
+            }
+        }
+    }
+    function convertJsonOption(opt, value, basePath, errors) {
+        if (isCompilerOptionsValue(opt, value)) {
+            var optType = opt.type;
+            if (optType === "list" && ts.isArray(value)) {
+                return convertJsonOptionOfListType(opt, value, basePath, errors);
+            }
+            else if (!ts.isString(optType)) {
+                return convertJsonOptionOfCustomType(opt, value, errors);
+            }
+            return normalizeNonListOptionValue(opt, basePath, value);
+        }
+        else {
+            errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, opt.name, getCompilerOptionValueTypeString(opt)));
+        }
+    }
+    function normalizeOptionValue(option, basePath, value) {
+        if (isNullOrUndefined(value))
+            return undefined;
+        if (option.type === "list") {
+            var listOption_1 = option;
+            if (listOption_1.element.isFilePath || !ts.isString(listOption_1.element.type)) {
+                return ts.filter(ts.map(value, function (v) { return normalizeOptionValue(listOption_1.element, basePath, v); }), function (v) { return !!v; });
+            }
+            return value;
+        }
+        else if (!ts.isString(option.type)) {
+            return option.type.get(ts.isString(value) ? value.toLowerCase() : value);
+        }
+        return normalizeNonListOptionValue(option, basePath, value);
+    }
+    function normalizeNonListOptionValue(option, basePath, value) {
+        if (option.isFilePath) {
+            value = ts.normalizePath(ts.combinePaths(basePath, value));
+            if (value === "") {
+                value = ".";
+            }
+        }
+        return value;
+    }
+    function convertJsonOptionOfCustomType(opt, value, errors) {
+        if (isNullOrUndefined(value))
+            return undefined;
+        var key = value.toLowerCase();
+        var val = opt.type.get(key);
+        if (val !== undefined) {
+            return val;
+        }
+        else {
+            errors.push(createCompilerDiagnosticForInvalidCustomType(opt));
+        }
+    }
+    function convertJsonOptionOfListType(option, values, basePath, errors) {
+        return ts.filter(ts.map(values, function (v) { return convertJsonOption(option.element, v, basePath, errors); }), function (v) { return !!v; });
+    }
+    function trimString(s) {
+        return typeof s.trim === "function" ? s.trim() : s.replace(/^[\s]+|[\s]+$/g, "");
+    }
+    /**
+     * Tests for a path that ends in a recursive directory wildcard.
+     * Matches **, \**, **\, and \**\, but not a**b.
+     *
+     * NOTE: used \ in place of / above to avoid issues with multiline comments.
+     *
+     * Breakdown:
+     *  (^|\/)      # matches either the beginning of the string or a directory separator.
+     *  \*\*        # matches the recursive directory wildcard "**".
+     *  \/?$        # matches an optional trailing directory separator at the end of the string.
+     */
+    var invalidTrailingRecursionPattern = /(^|\/)\*\*\/?$/;
+    /**
+     * Tests for a path where .. appears after a recursive directory wildcard.
+     * Matches **\..\*, **\a\..\*, and **\.., but not ..\**\*
+     *
+     * NOTE: used \ in place of / above to avoid issues with multiline comments.
+     *
+     * Breakdown:
+     *  (^|\/)      # matches either the beginning of the string or a directory separator.
+     *  \*\*\/      # matches a recursive directory wildcard "**" followed by a directory separator.
+     *  (.*\/)?     # optionally matches any number of characters followed by a directory separator.
+     *  \.\.        # matches a parent directory path component ".."
+     *  ($|\/)      # matches either the end of the string or a directory separator.
+     */
+    var invalidDotDotAfterRecursiveWildcardPattern = /(^|\/)\*\*\/(.*\/)?\.\.($|\/)/;
+    /**
+     * Tests for a path containing a wildcard character in a directory component of the path.
+     * Matches \*\, \?\, and \a*b\, but not \a\ or \a\*.
+     *
+     * NOTE: used \ in place of / above to avoid issues with multiline comments.
+     *
+     * Breakdown:
+     *  \/          # matches a directory separator.
+     *  [^/]*?      # matches any number of characters excluding directory separators (non-greedy).
+     *  [*?]        # matches either a wildcard character (* or ?)
+     *  [^/]*       # matches any number of characters excluding directory separators (greedy).
+     *  \/          # matches a directory separator.
+     */
+    var watchRecursivePattern = /\/[^/]*?[*?][^/]*\//;
+    /**
+     * Matches the portion of a wildcard path that does not contain wildcards.
+     * Matches \a of \a\*, or \a\b\c of \a\b\c\?\d.
+     *
+     * NOTE: used \ in place of / above to avoid issues with multiline comments.
+     *
+     * Breakdown:
+     *  ^                   # matches the beginning of the string
+     *  [^*?]*              # matches any number of non-wildcard characters
+     *  (?=\/[^/]*[*?])     # lookahead that matches a directory separator followed by
+     *                      # a path component that contains at least one wildcard character (* or ?).
+     */
+    var wildcardDirectoryPattern = /^[^*?]*(?=\/[^/]*[*?])/;
+    /**
+     * Expands an array of file specifications.
+     *
+     * @param filesSpecs The literal file names to include.
+     * @param includeSpecs The wildcard file specifications to include.
+     * @param excludeSpecs The wildcard file specifications to exclude.
+     * @param basePath The base path for any relative file specifications.
+     * @param options Compiler options.
+     * @param host The host used to resolve files and directories.
+     * @param errors An array for diagnostic reporting.
+     */
+    function matchFileNames(filesSpecs, includeSpecs, excludeSpecs, basePath, options, host, errors, extraFileExtensions, jsonSourceFile) {
+        basePath = ts.normalizePath(basePath);
+        var validatedIncludeSpecs, validatedExcludeSpecs;
+        // The exclude spec list is converted into a regular expression, which allows us to quickly
+        // test whether a file or directory should be excluded before recursively traversing the
+        // file system.
+        if (includeSpecs) {
+            validatedIncludeSpecs = validateSpecs(includeSpecs, errors, /*allowTrailingRecursion*/ false, jsonSourceFile, "include");
+        }
+        if (excludeSpecs) {
+            validatedExcludeSpecs = validateSpecs(excludeSpecs, errors, /*allowTrailingRecursion*/ true, jsonSourceFile, "exclude");
+        }
+        // Wildcard directories (provided as part of a wildcard path) are stored in a
+        // file map that marks whether it was a regular wildcard match (with a `*` or `?` token),
+        // or a recursive directory. This information is used by filesystem watchers to monitor for
+        // new entries in these paths.
+        var wildcardDirectories = getWildcardDirectories(validatedIncludeSpecs, validatedExcludeSpecs, basePath, host.useCaseSensitiveFileNames);
+        var spec = { filesSpecs: filesSpecs, referencesSpecs: undefined, includeSpecs: includeSpecs, excludeSpecs: excludeSpecs, validatedIncludeSpecs: validatedIncludeSpecs, validatedExcludeSpecs: validatedExcludeSpecs, wildcardDirectories: wildcardDirectories };
+        return getFileNamesFromConfigSpecs(spec, basePath, options, host, extraFileExtensions);
+    }
+    /**
+     * Gets the file names from the provided config file specs that contain, files, include, exclude and
+     * other properties needed to resolve the file names
+     * @param spec The config file specs extracted with file names to include, wildcards to include/exclude and other details
+     * @param basePath The base path for any relative file specifications.
+     * @param options Compiler options.
+     * @param host The host used to resolve files and directories.
+     * @param extraFileExtensions optionaly file extra file extension information from host
+     */
+    /* @internal */
+    function getFileNamesFromConfigSpecs(spec, basePath, options, host, extraFileExtensions) {
+        if (extraFileExtensions === void 0) { extraFileExtensions = []; }
+        basePath = ts.normalizePath(basePath);
+        var keyMapper = host.useCaseSensitiveFileNames ? ts.identity : ts.toLowerCase;
+        // Literal file names (provided via the "files" array in tsconfig.json) are stored in a
+        // file map with a possibly case insensitive key. We use this map later when when including
+        // wildcard paths.
+        var literalFileMap = ts.createMap();
+        // Wildcard paths (provided via the "includes" array in tsconfig.json) are stored in a
+        // file map with a possibly case insensitive key. We use this map to store paths matched
+        // via wildcard, and to handle extension priority.
+        var wildcardFileMap = ts.createMap();
+        var filesSpecs = spec.filesSpecs, validatedIncludeSpecs = spec.validatedIncludeSpecs, validatedExcludeSpecs = spec.validatedExcludeSpecs, wildcardDirectories = spec.wildcardDirectories;
+        // Rather than requery this for each file and filespec, we query the supported extensions
+        // once and store it on the expansion context.
+        var supportedExtensions = ts.getSupportedExtensions(options, extraFileExtensions);
+        // Literal files are always included verbatim. An "include" or "exclude" specification cannot
+        // remove a literal file.
+        if (filesSpecs) {
+            for (var _i = 0, filesSpecs_1 = filesSpecs; _i < filesSpecs_1.length; _i++) {
+                var fileName = filesSpecs_1[_i];
+                var file = ts.getNormalizedAbsolutePath(fileName, basePath);
+                literalFileMap.set(keyMapper(file), file);
+            }
+        }
+        if (validatedIncludeSpecs && validatedIncludeSpecs.length > 0) {
+            for (var _a = 0, _b = host.readDirectory(basePath, supportedExtensions, validatedExcludeSpecs, validatedIncludeSpecs, /*depth*/ undefined); _a < _b.length; _a++) {
+                var file = _b[_a];
+                // If we have already included a literal or wildcard path with a
+                // higher priority extension, we should skip this file.
+                //
+                // This handles cases where we may encounter both <file>.ts and
+                // <file>.d.ts (or <file>.js if "allowJs" is enabled) in the same
+                // directory when they are compilation outputs.
+                if (hasFileWithHigherPriorityExtension(file, literalFileMap, wildcardFileMap, supportedExtensions, keyMapper)) {
+                    continue;
+                }
+                // We may have included a wildcard path with a lower priority
+                // extension due to the user-defined order of entries in the
+                // "include" array. If there is a lower priority extension in the
+                // same directory, we should remove it.
+                removeWildcardFilesWithLowerPriorityExtension(file, wildcardFileMap, supportedExtensions, keyMapper);
+                var key = keyMapper(file);
+                if (!literalFileMap.has(key) && !wildcardFileMap.has(key)) {
+                    wildcardFileMap.set(key, file);
+                }
+            }
+        }
+        var literalFiles = ts.arrayFrom(literalFileMap.values());
+        var wildcardFiles = ts.arrayFrom(wildcardFileMap.values());
+        var projectReferences = spec.referencesSpecs && spec.referencesSpecs.map(function (r) {
+            return __assign({}, r, { path: ts.getNormalizedAbsolutePath(r.path, basePath) });
+        });
+        return {
+            fileNames: literalFiles.concat(wildcardFiles),
+            projectReferences: projectReferences,
+            wildcardDirectories: wildcardDirectories,
+            spec: spec
+        };
+    }
+    ts.getFileNamesFromConfigSpecs = getFileNamesFromConfigSpecs;
+    function validateSpecs(specs, errors, allowTrailingRecursion, jsonSourceFile, specKey) {
+        return specs.filter(function (spec) {
+            var diag = specToDiagnostic(spec, allowTrailingRecursion);
+            if (diag !== undefined) {
+                errors.push(createDiagnostic(diag, spec));
+            }
+            return diag === undefined;
+        });
+        function createDiagnostic(message, spec) {
+            var element = ts.getTsConfigPropArrayElementValue(jsonSourceFile, specKey, spec);
+            return element ?
+                ts.createDiagnosticForNodeInSourceFile(jsonSourceFile, element, message, spec) :
+                ts.createCompilerDiagnostic(message, spec);
+        }
+    }
+    function specToDiagnostic(spec, allowTrailingRecursion) {
+        if (!allowTrailingRecursion && invalidTrailingRecursionPattern.test(spec)) {
+            return ts.Diagnostics.File_specification_cannot_end_in_a_recursive_directory_wildcard_Asterisk_Asterisk_Colon_0;
+        }
+        else if (invalidDotDotAfterRecursiveWildcardPattern.test(spec)) {
+            return ts.Diagnostics.File_specification_cannot_contain_a_parent_directory_that_appears_after_a_recursive_directory_wildcard_Asterisk_Asterisk_Colon_0;
+        }
+    }
+    /**
+     * Gets directories in a set of include patterns that should be watched for changes.
+     */
+    function getWildcardDirectories(include, exclude, path, useCaseSensitiveFileNames) {
+        // We watch a directory recursively if it contains a wildcard anywhere in a directory segment
+        // of the pattern:
+        //
+        //  /a/b/**/d   - Watch /a/b recursively to catch changes to any d in any subfolder recursively
+        //  /a/b/*/d    - Watch /a/b recursively to catch any d in any immediate subfolder, even if a new subfolder is added
+        //  /a/b        - Watch /a/b recursively to catch changes to anything in any recursive subfoler
+        //
+        // We watch a directory without recursion if it contains a wildcard in the file segment of
+        // the pattern:
+        //
+        //  /a/b/*      - Watch /a/b directly to catch any new file
+        //  /a/b/a?z    - Watch /a/b directly to catch any new file matching a?z
+        var rawExcludeRegex = ts.getRegularExpressionForWildcard(exclude, path, "exclude");
+        var excludeRegex = rawExcludeRegex && new RegExp(rawExcludeRegex, useCaseSensitiveFileNames ? "" : "i");
+        var wildcardDirectories = {};
+        if (include !== undefined) {
+            var recursiveKeys = [];
+            for (var _i = 0, include_1 = include; _i < include_1.length; _i++) {
+                var file = include_1[_i];
+                var spec = ts.normalizePath(ts.combinePaths(path, file));
+                if (excludeRegex && excludeRegex.test(spec)) {
+                    continue;
+                }
+                var match = getWildcardDirectoryFromSpec(spec, useCaseSensitiveFileNames);
+                if (match) {
+                    var key = match.key, flags = match.flags;
+                    var existingFlags = wildcardDirectories[key];
+                    if (existingFlags === undefined || existingFlags < flags) {
+                        wildcardDirectories[key] = flags;
+                        if (flags === 1 /* Recursive */) {
+                            recursiveKeys.push(key);
+                        }
+                    }
+                }
+            }
+            // Remove any subpaths under an existing recursively watched directory.
+            for (var key in wildcardDirectories) {
+                if (ts.hasProperty(wildcardDirectories, key)) {
+                    for (var _a = 0, recursiveKeys_1 = recursiveKeys; _a < recursiveKeys_1.length; _a++) {
+                        var recursiveKey = recursiveKeys_1[_a];
+                        if (key !== recursiveKey && ts.containsPath(recursiveKey, key, path, !useCaseSensitiveFileNames)) {
+                            delete wildcardDirectories[key];
+                        }
+                    }
+                }
+            }
+        }
+        return wildcardDirectories;
+    }
+    function getWildcardDirectoryFromSpec(spec, useCaseSensitiveFileNames) {
+        var match = wildcardDirectoryPattern.exec(spec);
+        if (match) {
+            return {
+                key: useCaseSensitiveFileNames ? match[0] : match[0].toLowerCase(),
+                flags: watchRecursivePattern.test(spec) ? 1 /* Recursive */ : 0 /* None */
+            };
+        }
+        if (ts.isImplicitGlob(spec)) {
+            return { key: spec, flags: 1 /* Recursive */ };
+        }
+        return undefined;
+    }
+    /**
+     * Determines whether a literal or wildcard file has already been included that has a higher
+     * extension priority.
+     *
+     * @param file The path to the file.
+     * @param extensionPriority The priority of the extension.
+     * @param context The expansion context.
+     */
+    function hasFileWithHigherPriorityExtension(file, literalFiles, wildcardFiles, extensions, keyMapper) {
+        var extensionPriority = ts.getExtensionPriority(file, extensions);
+        var adjustedExtensionPriority = ts.adjustExtensionPriority(extensionPriority, extensions);
+        for (var i = 0 /* Highest */; i < adjustedExtensionPriority; i++) {
+            var higherPriorityExtension = extensions[i];
+            var higherPriorityPath = keyMapper(ts.changeExtension(file, higherPriorityExtension));
+            if (literalFiles.has(higherPriorityPath) || wildcardFiles.has(higherPriorityPath)) {
+                return true;
+            }
+        }
+        return false;
+    }
+    /**
+     * Removes files included via wildcard expansion with a lower extension priority that have
+     * already been included.
+     *
+     * @param file The path to the file.
+     * @param extensionPriority The priority of the extension.
+     * @param context The expansion context.
+     */
+    function removeWildcardFilesWithLowerPriorityExtension(file, wildcardFiles, extensions, keyMapper) {
+        var extensionPriority = ts.getExtensionPriority(file, extensions);
+        var nextExtensionPriority = ts.getNextLowestExtensionPriority(extensionPriority, extensions);
+        for (var i = nextExtensionPriority; i < extensions.length; i++) {
+            var lowerPriorityExtension = extensions[i];
+            var lowerPriorityPath = keyMapper(ts.changeExtension(file, lowerPriorityExtension));
+            wildcardFiles.delete(lowerPriorityPath);
+        }
+    }
+    /**
+     * Produces a cleaned version of compiler options with personally identifiying info (aka, paths) removed.
+     * Also converts enum values back to strings.
+     */
+    /* @internal */
+    function convertCompilerOptionsForTelemetry(opts) {
+        var out = {};
+        for (var key in opts) {
+            if (opts.hasOwnProperty(key)) {
+                var type = getOptionFromName(key);
+                if (type !== undefined) { // Ignore unknown options
+                    out[key] = getOptionValueWithEmptyStrings(opts[key], type);
+                }
+            }
+        }
+        return out;
+    }
+    ts.convertCompilerOptionsForTelemetry = convertCompilerOptionsForTelemetry;
+    function getOptionValueWithEmptyStrings(value, option) {
+        switch (option.type) {
+            case "object": // "paths". Can't get any useful information from the value since we blank out strings, so just return "".
+                return "";
+            case "string": // Could be any arbitrary string -- use empty string instead.
+                return "";
+            case "number": // Allow numbers, but be sure to check it's actually a number.
+                return typeof value === "number" ? value : "";
+            case "boolean":
+                return typeof value === "boolean" ? value : "";
+            case "list":
+                var elementType_1 = option.element;
+                return ts.isArray(value) ? value.map(function (v) { return getOptionValueWithEmptyStrings(v, elementType_1); }) : "";
+            default:
+                return ts.forEachEntry(option.type, function (optionEnumValue, optionStringValue) {
+                    if (optionEnumValue === value) {
+                        return optionStringValue;
+                    }
+                }); // TODO: GH#18217
+        }
+    }
+})(ts || (ts = {}));
+var ts;
+(function (ts) {
+    function trace(host) {
+        host.trace(ts.formatMessage.apply(undefined, arguments));
+    }
+    ts.trace = trace;
+    /* @internal */
+    function isTraceEnabled(compilerOptions, host) {
+        return !!compilerOptions.traceResolution && host.trace !== undefined;
+    }
+    ts.isTraceEnabled = isTraceEnabled;
+    function withPackageId(packageId, r) {
+        return r && { path: r.path, extension: r.ext, packageId: packageId };
+    }
+    function noPackageId(r) {
+        return withPackageId(/*packageId*/ undefined, r);
+    }
+    /**
+     * Kinds of file that we are currently looking for.
+     * Typically there is one pass with Extensions.TypeScript, then a second pass with Extensions.JavaScript.
+     */
+    var Extensions;
+    (function (Extensions) {
+        Extensions[Extensions["TypeScript"] = 0] = "TypeScript";
+        Extensions[Extensions["JavaScript"] = 1] = "JavaScript";
+        Extensions[Extensions["Json"] = 2] = "Json";
+        Extensions[Extensions["DtsOnly"] = 3] = "DtsOnly"; /** Only '.d.ts' */
+    })(Extensions || (Extensions = {}));
+    /** Used with `Extensions.DtsOnly` to extract the path from TypeScript results. */
+    function resolvedTypeScriptOnly(resolved) {
+        if (!resolved) {
+            return undefined;
+        }
+        ts.Debug.assert(ts.extensionIsTypeScript(resolved.extension));
+        return { fileName: resolved.path, packageId: resolved.packageId };
+    }
+    function createResolvedModuleWithFailedLookupLocations(resolved, originalPath, isExternalLibraryImport, failedLookupLocations) {
+        return {
+            resolvedModule: resolved && { resolvedFileName: resolved.path, originalPath: originalPath, extension: resolved.extension, isExternalLibraryImport: isExternalLibraryImport, packageId: resolved.packageId },
+            failedLookupLocations: failedLookupLocations
+        };
+    }
+    /** Reads from "main" or "types"/"typings" depending on `extensions`. */
+    function tryReadPackageJsonFields(readTypes, jsonContent, baseDirectory, state) {
+        return readTypes ? tryReadFromField("typings") || tryReadFromField("types") : tryReadFromField("main");
+        function tryReadFromField(fieldName) {
+            if (!ts.hasProperty(jsonContent, fieldName)) {
+                if (state.traceEnabled) {
+                    trace(state.host, ts.Diagnostics.package_json_does_not_have_a_0_field, fieldName);
+                }
+                return;
+            }
+            var fileName = jsonContent[fieldName];
+            if (!ts.isString(fileName)) {
+                if (state.traceEnabled) {
+                    trace(state.host, ts.Diagnostics.Expected_type_of_0_field_in_package_json_to_be_string_got_1, fieldName, typeof fileName);
+                }
+                return;
+            }
+            var path = ts.normalizePath(ts.combinePaths(baseDirectory, fileName));
+            if (state.traceEnabled) {
+                trace(state.host, ts.Diagnostics.package_json_has_0_field_1_that_references_2, fieldName, fileName, path);
+            }
+            return path;
+        }
+    }
+    /* @internal */
+    function readJson(path, host) {
+        try {
+            var jsonText = host.readFile(path);
+            if (!jsonText)
+                return {};
+            var result = ts.parseConfigFileTextToJson(path, jsonText);
+            if (result.error) {
+                return {};
+            }
+            return result.config;
+        }
+        catch (e) {
+            // gracefully handle if readFile fails or returns not JSON
+            return {};
+        }
+    }
+    ts.readJson = readJson;
+    function getEffectiveTypeRoots(options, host) {
+        if (options.typeRoots) {
+            return options.typeRoots;
+        }
+        var currentDirectory;
+        if (options.configFilePath) {
+            currentDirectory = ts.getDirectoryPath(options.configFilePath);
+        }
+        else if (host.getCurrentDirectory) {
+            currentDirectory = host.getCurrentDirectory();
+        }
+        if (currentDirectory !== undefined) {
+            return getDefaultTypeRoots(currentDirectory, host);
+        }
+    }
+    ts.getEffectiveTypeRoots = getEffectiveTypeRoots;
+    /**
+     * Returns the path to every node_modules/@types directory from some ancestor directory.
+     * Returns undefined if there are none.
+     */
+    function getDefaultTypeRoots(currentDirectory, host) {
+        if (!host.directoryExists) {
+            return [ts.combinePaths(currentDirectory, nodeModulesAtTypes)];
+            // And if it doesn't exist, tough.
+        }
+        var typeRoots;
+        ts.forEachAncestorDirectory(ts.normalizePath(currentDirectory), function (directory) {
+            var atTypes = ts.combinePaths(directory, nodeModulesAtTypes);
+            if (host.directoryExists(atTypes)) {
+                (typeRoots || (typeRoots = [])).push(atTypes);
+            }
+            return undefined;
+        });
+        return typeRoots;
+    }
+    var nodeModulesAtTypes = ts.combinePaths("node_modules", "@types");
+    /**
+     * @param {string | undefined} containingFile - file that contains type reference directive, can be undefined if containing file is unknown.
+     * This is possible in case if resolution is performed for directives specified via 'types' parameter. In this case initial path for secondary lookups
+     * is assumed to be the same as root directory of the project.
+     */
+    function resolveTypeReferenceDirective(typeReferenceDirectiveName, containingFile, options, host) {
+        var traceEnabled = isTraceEnabled(options, host);
+        var moduleResolutionState = { compilerOptions: options, host: host, traceEnabled: traceEnabled };
+        var typeRoots = getEffectiveTypeRoots(options, host);
+        if (traceEnabled) {
+            if (containingFile === undefined) {
+                if (typeRoots === undefined) {
+                    trace(host, ts.Diagnostics.Resolving_type_reference_directive_0_containing_file_not_set_root_directory_not_set, typeReferenceDirectiveName);
+                }
+                else {
+                    trace(host, ts.Diagnostics.Resolving_type_reference_directive_0_containing_file_not_set_root_directory_1, typeReferenceDirectiveName, typeRoots);
+                }
+            }
+            else {
+                if (typeRoots === undefined) {
+                    trace(host, ts.Diagnostics.Resolving_type_reference_directive_0_containing_file_1_root_directory_not_set, typeReferenceDirectiveName, containingFile);
+                }
+                else {
+                    trace(host, ts.Diagnostics.Resolving_type_reference_directive_0_containing_file_1_root_directory_2, typeReferenceDirectiveName, containingFile, typeRoots);
+                }
+            }
+        }
+        var failedLookupLocations = [];
+        var resolved = primaryLookup();
+        var primary = true;
+        if (!resolved) {
+            resolved = secondaryLookup();
+            primary = false;
+        }
+        var resolvedTypeReferenceDirective;
+        if (resolved) {
+            if (!options.preserveSymlinks) {
+                resolved = __assign({}, resolved, { fileName: realPath(resolved.fileName, host, traceEnabled) });
+            }
+            if (traceEnabled) {
+                trace(host, ts.Diagnostics.Type_reference_directive_0_was_successfully_resolved_to_1_primary_Colon_2, typeReferenceDirectiveName, resolved.fileName, primary);
+            }
+            resolvedTypeReferenceDirective = { primary: primary, resolvedFileName: resolved.fileName, packageId: resolved.packageId };
+        }
+        return { resolvedTypeReferenceDirective: resolvedTypeReferenceDirective, failedLookupLocations: failedLookupLocations };
+        function primaryLookup() {
+            // Check primary library paths
+            if (typeRoots && typeRoots.length) {
+                if (traceEnabled) {
+                    trace(host, ts.Diagnostics.Resolving_with_primary_search_path_0, typeRoots.join(", "));
+                }
+                return ts.forEach(typeRoots, function (typeRoot) {
+                    var candidate = ts.combinePaths(typeRoot, typeReferenceDirectiveName);
+                    var candidateDirectory = ts.getDirectoryPath(candidate);
+                    var directoryExists = directoryProbablyExists(candidateDirectory, host);
+                    if (!directoryExists && traceEnabled) {
+                        trace(host, ts.Diagnostics.Directory_0_does_not_exist_skipping_all_lookups_in_it, candidateDirectory);
+                    }
+                    return resolvedTypeScriptOnly(loadNodeModuleFromDirectory(Extensions.DtsOnly, candidate, failedLookupLocations, !directoryExists, moduleResolutionState));
+                });
+            }
+            else {
+                if (traceEnabled) {
+                    trace(host, ts.Diagnostics.Root_directory_cannot_be_determined_skipping_primary_search_paths);
+                }
+            }
+        }
+        function secondaryLookup() {
+            var initialLocationForSecondaryLookup = containingFile && ts.getDirectoryPath(containingFile);
+            if (initialLocationForSecondaryLookup !== undefined) {
+                // check secondary locations
+                if (traceEnabled) {
+                    trace(host, ts.Diagnostics.Looking_up_in_node_modules_folder_initial_location_0, initialLocationForSecondaryLookup);
+                }
+                var result = loadModuleFromNodeModules(Extensions.DtsOnly, typeReferenceDirectiveName, initialLocationForSecondaryLookup, failedLookupLocations, moduleResolutionState, /*cache*/ undefined);
+                var resolvedFile = resolvedTypeScriptOnly(result && result.value);
+                if (!resolvedFile && traceEnabled) {
+                    trace(host, ts.Diagnostics.Type_reference_directive_0_was_not_resolved, typeReferenceDirectiveName);
+                }
+                return resolvedFile;
+            }
+            else {
+                if (traceEnabled) {
+                    trace(host, ts.Diagnostics.Containing_file_is_not_specified_and_root_directory_cannot_be_determined_skipping_lookup_in_node_modules_folder);
+                }
+            }
+        }
+    }
+    ts.resolveTypeReferenceDirective = resolveTypeReferenceDirective;
+    /**
+     * Given a set of options, returns the set of type directive names
+     *   that should be included for this program automatically.
+     * This list could either come from the config file,
+     *   or from enumerating the types root + initial secondary types lookup location.
+     * More type directives might appear in the program later as a result of loading actual source files;
+     *   this list is only the set of defaults that are implicitly included.
+     */
+    function getAutomaticTypeDirectiveNames(options, host) {
+        // Use explicit type list from tsconfig.json
+        if (options.types) {
+            return options.types;
+        }
+        // Walk the primary type lookup locations
+        var result = [];
+        if (host.directoryExists && host.getDirectories) {
+            var typeRoots = getEffectiveTypeRoots(options, host);
+            if (typeRoots) {
+                for (var _i = 0, typeRoots_1 = typeRoots; _i < typeRoots_1.length; _i++) {
+                    var root = typeRoots_1[_i];
+                    if (host.directoryExists(root)) {
+                        for (var _a = 0, _b = host.getDirectories(root); _a < _b.length; _a++) {
+                            var typeDirectivePath = _b[_a];
+                            var normalized = ts.normalizePath(typeDirectivePath);
+                            var packageJsonPath = pathToPackageJson(ts.combinePaths(root, normalized));
+                            // `types-publisher` sometimes creates packages with `"typings": null` for packages that don't provide their own types.
+                            // See `createNotNeededPackageJSON` in the types-publisher` repo.
+                            // tslint:disable-next-line:no-null-keyword
+                            var isNotNeededPackage = host.fileExists(packageJsonPath) && readJson(packageJsonPath, host).typings === null;
+                            if (!isNotNeededPackage) {
+                                // Return just the type directive names
+                                result.push(ts.getBaseFileName(normalized));
+                            }
+                        }
+                    }
+                }
+            }
+        }
+        return result;
+    }
+    ts.getAutomaticTypeDirectiveNames = getAutomaticTypeDirectiveNames;
+    function createModuleResolutionCache(currentDirectory, getCanonicalFileName) {
+        return createModuleResolutionCacheWithMaps(ts.createMap(), ts.createMap(), currentDirectory, getCanonicalFileName);
+    }
+    ts.createModuleResolutionCache = createModuleResolutionCache;
+    /*@internal*/
+    function createModuleResolutionCacheWithMaps(directoryToModuleNameMap, moduleNameToDirectoryMap, currentDirectory, getCanonicalFileName) {
+        return { getOrCreateCacheForDirectory: getOrCreateCacheForDirectory, getOrCreateCacheForModuleName: getOrCreateCacheForModuleName };
+        function getOrCreateCacheForDirectory(directoryName) {
+            var path = ts.toPath(directoryName, currentDirectory, getCanonicalFileName);
+            var perFolderCache = directoryToModuleNameMap.get(path);
+            if (!perFolderCache) {
+                perFolderCache = ts.createMap();
+                directoryToModuleNameMap.set(path, perFolderCache);
+            }
+            return perFolderCache;
+        }
+        function getOrCreateCacheForModuleName(nonRelativeModuleName) {
+            if (ts.isExternalModuleNameRelative(nonRelativeModuleName)) {
+                return undefined; // TODO: GH#18217
+            }
+            var perModuleNameCache = moduleNameToDirectoryMap.get(nonRelativeModuleName);
+            if (!perModuleNameCache) {
+                perModuleNameCache = createPerModuleNameCache();
+                moduleNameToDirectoryMap.set(nonRelativeModuleName, perModuleNameCache);
+            }
+            return perModuleNameCache;
+        }
+        function createPerModuleNameCache() {
+            var directoryPathMap = ts.createMap();
+            return { get: get, set: set };
+            function get(directory) {
+                return directoryPathMap.get(ts.toPath(directory, currentDirectory, getCanonicalFileName));
+            }
+            /**
+             * At first this function add entry directory -> module resolution result to the table.
+             * Then it computes the set of parent folders for 'directory' that should have the same module resolution result
+             * and for every parent folder in set it adds entry: parent -> module resolution. .
+             * Lets say we first directory name: /a/b/c/d/e and resolution result is: /a/b/bar.ts.
+             * Set of parent folders that should have the same result will be:
+             * [
+             *     /a/b/c/d, /a/b/c, /a/b
+             * ]
+             * this means that request for module resolution from file in any of these folder will be immediately found in cache.
+             */
+            function set(directory, result) {
+                var path = ts.toPath(directory, currentDirectory, getCanonicalFileName);
+                // if entry is already in cache do nothing
+                if (directoryPathMap.has(path)) {
+                    return;
+                }
+                directoryPathMap.set(path, result);
+                var resolvedFileName = result.resolvedModule && result.resolvedModule.resolvedFileName;
+                // find common prefix between directory and resolved file name
+                // this common prefix should be the shorted path that has the same resolution
+                // directory: /a/b/c/d/e
+                // resolvedFileName: /a/b/foo.d.ts
+                var commonPrefix = getCommonPrefix(path, resolvedFileName);
+                var current = path;
+                while (true) {
+                    var parent = ts.getDirectoryPath(current);
+                    if (parent === current || directoryPathMap.has(parent)) {
+                        break;
+                    }
+                    directoryPathMap.set(parent, result);
+                    current = parent;
+                    if (current === commonPrefix) {
+                        break;
+                    }
+                }
+            }
+            function getCommonPrefix(directory, resolution) {
+                if (resolution === undefined) {
+                    return undefined;
+                }
+                var resolutionDirectory = ts.toPath(ts.getDirectoryPath(resolution), currentDirectory, getCanonicalFileName);
+                // find first position where directory and resolution differs
+                var i = 0;
+                while (i < Math.min(directory.length, resolutionDirectory.length) && directory.charCodeAt(i) === resolutionDirectory.charCodeAt(i)) {
+                    i++;
+                }
+                // find last directory separator before position i
+                var sep = directory.lastIndexOf(ts.directorySeparator, i);
+                if (sep < 0) {
+                    return undefined;
+                }
+                return directory.substr(0, sep);
+            }
+        }
+    }
+    ts.createModuleResolutionCacheWithMaps = createModuleResolutionCacheWithMaps;
+    function resolveModuleNameFromCache(moduleName, containingFile, cache) {
+        var containingDirectory = ts.getDirectoryPath(containingFile);
+        var perFolderCache = cache && cache.getOrCreateCacheForDirectory(containingDirectory);
+        return perFolderCache && perFolderCache.get(moduleName);
+    }
+    ts.resolveModuleNameFromCache = resolveModuleNameFromCache;
+    function resolveModuleName(moduleName, containingFile, compilerOptions, host, cache) {
+        var traceEnabled = isTraceEnabled(compilerOptions, host);
+        if (traceEnabled) {
+            trace(host, ts.Diagnostics.Resolving_module_0_from_1, moduleName, containingFile);
+        }
+        var containingDirectory = ts.getDirectoryPath(containingFile);
+        var perFolderCache = cache && cache.getOrCreateCacheForDirectory(containingDirectory);
+        var result = perFolderCache && perFolderCache.get(moduleName);
+        if (result) {
+            if (traceEnabled) {
+                trace(host, ts.Diagnostics.Resolution_for_module_0_was_found_in_cache_from_location_1, moduleName, containingDirectory);
+            }
+        }
+        else {
+            var moduleResolution = compilerOptions.moduleResolution;
+            if (moduleResolution === undefined) {
+                moduleResolution = ts.getEmitModuleKind(compilerOptions) === ts.ModuleKind.CommonJS ? ts.ModuleResolutionKind.NodeJs : ts.ModuleResolutionKind.Classic;
+                if (traceEnabled) {
+                    trace(host, ts.Diagnostics.Module_resolution_kind_is_not_specified_using_0, ts.ModuleResolutionKind[moduleResolution]);
+                }
+            }
+            else {
+                if (traceEnabled) {
+                    trace(host, ts.Diagnostics.Explicitly_specified_module_resolution_kind_Colon_0, ts.ModuleResolutionKind[moduleResolution]);
+                }
+            }
+            switch (moduleResolution) {
+                case ts.ModuleResolutionKind.NodeJs:
+                    result = nodeModuleNameResolver(moduleName, containingFile, compilerOptions, host, cache);
+                    break;
+                case ts.ModuleResolutionKind.Classic:
+                    result = classicNameResolver(moduleName, containingFile, compilerOptions, host, cache);
+                    break;
+                default:
+                    return ts.Debug.fail("Unexpected moduleResolution: " + moduleResolution);
+            }
+            if (perFolderCache) {
+                perFolderCache.set(moduleName, result);
+                // put result in per-module name cache
+                var perModuleNameCache = cache.getOrCreateCacheForModuleName(moduleName);
+                if (perModuleNameCache) {
+                    perModuleNameCache.set(containingDirectory, result);
+                }
+            }
+        }
+        if (traceEnabled) {
+            if (result.resolvedModule) {
+                trace(host, ts.Diagnostics.Module_name_0_was_successfully_resolved_to_1, moduleName, result.resolvedModule.resolvedFileName);
+            }
+            else {
+                trace(host, ts.Diagnostics.Module_name_0_was_not_resolved, moduleName);
+            }
+        }
+        return result;
+    }
+    ts.resolveModuleName = resolveModuleName;
+    /**
+     * Any module resolution kind can be augmented with optional settings: 'baseUrl', 'paths' and 'rootDirs' - they are used to
+     * mitigate differences between design time structure of the project and its runtime counterpart so the same import name
+     * can be resolved successfully by TypeScript compiler and runtime module loader.
+     * If these settings are set then loading procedure will try to use them to resolve module name and it can of failure it will
+     * fallback to standard resolution routine.
+     *
+     * - baseUrl - this setting controls how non-relative module names are resolved. If this setting is specified then non-relative
+     * names will be resolved relative to baseUrl: i.e. if baseUrl is '/a/b' then candidate location to resolve module name 'c/d' will
+     * be '/a/b/c/d'
+     * - paths - this setting can only be used when baseUrl is specified. allows to tune how non-relative module names
+     * will be resolved based on the content of the module name.
+     * Structure of 'paths' compiler options
+     * 'paths': {
+     *    pattern-1: [...substitutions],
+     *    pattern-2: [...substitutions],
+     *    ...
+     *    pattern-n: [...substitutions]
+     * }
+     * Pattern here is a string that can contain zero or one '*' character. During module resolution module name will be matched against
+     * all patterns in the list. Matching for patterns that don't contain '*' means that module name must be equal to pattern respecting the case.
+     * If pattern contains '*' then to match pattern "<prefix>*<suffix>" module name must start with the <prefix> and end with <suffix>.
+     * <MatchedStar> denotes part of the module name between <prefix> and <suffix>.
+     * If module name can be matches with multiple patterns then pattern with the longest prefix will be picked.
+     * After selecting pattern we'll use list of substitutions to get candidate locations of the module and the try to load module
+     * from the candidate location.
+     * Substitution is a string that can contain zero or one '*'. To get candidate location from substitution we'll pick every
+     * substitution in the list and replace '*' with <MatchedStar> string. If candidate location is not rooted it
+     * will be converted to absolute using baseUrl.
+     * For example:
+     * baseUrl: /a/b/c
+     * "paths": {
+     *     // match all module names
+     *     "*": [
+     *         "*",        // use matched name as is,
+     *                     // <matched name> will be looked as /a/b/c/<matched name>
+     *
+     *         "folder1/*" // substitution will convert matched name to 'folder1/<matched name>',
+     *                     // since it is not rooted then final candidate location will be /a/b/c/folder1/<matched name>
+     *     ],
+     *     // match module names that start with 'components/'
+     *     "components/*": [ "/root/components/*" ] // substitution will convert /components/folder1/<matched name> to '/root/components/folder1/<matched name>',
+     *                                              // it is rooted so it will be final candidate location
+     * }
+     *
+     * 'rootDirs' allows the project to be spreaded across multiple locations and resolve modules with relative names as if
+     * they were in the same location. For example lets say there are two files
+     * '/local/src/content/file1.ts'
+     * '/shared/components/contracts/src/content/protocols/file2.ts'
+     * After bundling content of '/shared/components/contracts/src' will be merged with '/local/src' so
+     * if file1 has the following import 'import {x} from "./protocols/file2"' it will be resolved successfully in runtime.
+     * 'rootDirs' provides the way to tell compiler that in order to get the whole project it should behave as if content of all
+     * root dirs were merged together.
+     * I.e. for the example above 'rootDirs' will have two entries: [ '/local/src', '/shared/components/contracts/src' ].
+     * Compiler will first convert './protocols/file2' into absolute path relative to the location of containing file:
+     * '/local/src/content/protocols/file2' and try to load it - failure.
+     * Then it will search 'rootDirs' looking for a longest matching prefix of this absolute path and if such prefix is found - absolute path will
+     * be converted to a path relative to found rootDir entry './content/protocols/file2' (*). As a last step compiler will check all remaining
+     * entries in 'rootDirs', use them to build absolute path out of (*) and try to resolve module from this location.
+     */
+    function tryLoadModuleUsingOptionalResolutionSettings(extensions, moduleName, containingDirectory, loader, failedLookupLocations, state) {
+        if (!ts.isExternalModuleNameRelative(moduleName)) {
+            return tryLoadModuleUsingBaseUrl(extensions, moduleName, loader, failedLookupLocations, state);
+        }
+        else {
+            return tryLoadModuleUsingRootDirs(extensions, moduleName, containingDirectory, loader, failedLookupLocations, state);
+        }
+    }
+    function tryLoadModuleUsingRootDirs(extensions, moduleName, containingDirectory, loader, failedLookupLocations, state) {
+        if (!state.compilerOptions.rootDirs) {
+            return undefined;
+        }
+        if (state.traceEnabled) {
+            trace(state.host, ts.Diagnostics.rootDirs_option_is_set_using_it_to_resolve_relative_module_name_0, moduleName);
+        }
+        var candidate = ts.normalizePath(ts.combinePaths(containingDirectory, moduleName));
+        var matchedRootDir;
+        var matchedNormalizedPrefix;
+        for (var _i = 0, _a = state.compilerOptions.rootDirs; _i < _a.length; _i++) {
+            var rootDir = _a[_i];
+            // rootDirs are expected to be absolute
+            // in case of tsconfig.json this will happen automatically - compiler will expand relative names
+            // using location of tsconfig.json as base location
+            var normalizedRoot = ts.normalizePath(rootDir);
+            if (!ts.endsWith(normalizedRoot, ts.directorySeparator)) {
+                normalizedRoot += ts.directorySeparator;
+            }
+            var isLongestMatchingPrefix = ts.startsWith(candidate, normalizedRoot) &&
+                (matchedNormalizedPrefix === undefined || matchedNormalizedPrefix.length < normalizedRoot.length);
+            if (state.traceEnabled) {
+                trace(state.host, ts.Diagnostics.Checking_if_0_is_the_longest_matching_prefix_for_1_2, normalizedRoot, candidate, isLongestMatchingPrefix);
+            }
+            if (isLongestMatchingPrefix) {
+                matchedNormalizedPrefix = normalizedRoot;
+                matchedRootDir = rootDir;
+            }
+        }
+        if (matchedNormalizedPrefix) {
+            if (state.traceEnabled) {
+                trace(state.host, ts.Diagnostics.Longest_matching_prefix_for_0_is_1, candidate, matchedNormalizedPrefix);
+            }
+            var suffix = candidate.substr(matchedNormalizedPrefix.length);
+            // first - try to load from a initial location
+            if (state.traceEnabled) {
+                trace(state.host, ts.Diagnostics.Loading_0_from_the_root_dir_1_candidate_location_2, suffix, matchedNormalizedPrefix, candidate);
+            }
+            var resolvedFileName = loader(extensions, candidate, failedLookupLocations, !directoryProbablyExists(containingDirectory, state.host), state);
+            if (resolvedFileName) {
+                return resolvedFileName;
+            }
+            if (state.traceEnabled) {
+                trace(state.host, ts.Diagnostics.Trying_other_entries_in_rootDirs);
+            }
+            // then try to resolve using remaining entries in rootDirs
+            for (var _b = 0, _c = state.compilerOptions.rootDirs; _b < _c.length; _b++) {
+                var rootDir = _c[_b];
+                if (rootDir === matchedRootDir) {
+                    // skip the initially matched entry
+                    continue;
+                }
+                var candidate_1 = ts.combinePaths(ts.normalizePath(rootDir), suffix);
+                if (state.traceEnabled) {
+                    trace(state.host, ts.Diagnostics.Loading_0_from_the_root_dir_1_candidate_location_2, suffix, rootDir, candidate_1);
+                }
+                var baseDirectory = ts.getDirectoryPath(candidate_1);
+                var resolvedFileName_1 = loader(extensions, candidate_1, failedLookupLocations, !directoryProbablyExists(baseDirectory, state.host), state);
+                if (resolvedFileName_1) {
+                    return resolvedFileName_1;
+                }
+            }
+            if (state.traceEnabled) {
+                trace(state.host, ts.Diagnostics.Module_resolution_using_rootDirs_has_failed);
+            }
+        }
+        return undefined;
+    }
+    function tryLoadModuleUsingBaseUrl(extensions, moduleName, loader, failedLookupLocations, state) {
+        if (!state.compilerOptions.baseUrl) {
+            return undefined;
+        }
+        if (state.traceEnabled) {
+            trace(state.host, ts.Diagnostics.baseUrl_option_is_set_to_0_using_this_value_to_resolve_non_relative_module_name_1, state.compilerOptions.baseUrl, moduleName);
+        }
+        // string is for exact match
+        var matchedPattern;
+        if (state.compilerOptions.paths) {
+            if (state.traceEnabled) {
+                trace(state.host, ts.Diagnostics.paths_option_is_specified_looking_for_a_pattern_to_match_module_name_0, moduleName);
+            }
+            matchedPattern = ts.matchPatternOrExact(ts.getOwnKeys(state.compilerOptions.paths), moduleName);
+        }
+        if (matchedPattern) {
+            var matchedStar_1 = ts.isString(matchedPattern) ? undefined : ts.matchedText(matchedPattern, moduleName);
+            var matchedPatternText = ts.isString(matchedPattern) ? matchedPattern : ts.patternText(matchedPattern);
+            if (state.traceEnabled) {
+                trace(state.host, ts.Diagnostics.Module_name_0_matched_pattern_1, moduleName, matchedPatternText);
+            }
+            return ts.forEach(state.compilerOptions.paths[matchedPatternText], function (subst) {
+                var path = matchedStar_1 ? subst.replace("*", matchedStar_1) : subst;
+                var candidate = ts.normalizePath(ts.combinePaths(state.compilerOptions.baseUrl, path));
+                if (state.traceEnabled) {
+                    trace(state.host, ts.Diagnostics.Trying_substitution_0_candidate_module_location_Colon_1, subst, path);
+                }
+                // A path mapping may have an extension, in contrast to an import, which should omit it.
+                var extension = ts.tryGetExtensionFromPath(candidate);
+                if (extension !== undefined) {
+                    var path_1 = tryFile(candidate, failedLookupLocations, /*onlyRecordFailures*/ false, state);
+                    if (path_1 !== undefined) {
+                        return noPackageId({ path: path_1, ext: extension });
+                    }
+                }
+                return loader(extensions, candidate, failedLookupLocations, !directoryProbablyExists(ts.getDirectoryPath(candidate), state.host), state);
+            });
+        }
+        else {
+            var candidate = ts.normalizePath(ts.combinePaths(state.compilerOptions.baseUrl, moduleName));
+            if (state.traceEnabled) {
+                trace(state.host, ts.Diagnostics.Resolving_module_name_0_relative_to_base_url_1_2, moduleName, state.compilerOptions.baseUrl, candidate);
+            }
+            return loader(extensions, candidate, failedLookupLocations, !directoryProbablyExists(ts.getDirectoryPath(candidate), state.host), state);
+        }
+    }
+    function nodeModuleNameResolver(moduleName, containingFile, compilerOptions, host, cache) {
+        return nodeModuleNameResolverWorker(moduleName, ts.getDirectoryPath(containingFile), compilerOptions, host, cache, /*jsOnly*/ false);
+    }
+    ts.nodeModuleNameResolver = nodeModuleNameResolver;
+    /**
+     * Expose resolution logic to allow us to use Node module resolution logic from arbitrary locations.
+     * No way to do this with `require()`: https://github.com/nodejs/node/issues/5963
+     * Throws an error if the module can't be resolved.
+     */
+    /* @internal */
+    function resolveJavaScriptModule(moduleName, initialDir, host) {
+        var _a = nodeModuleNameResolverWorker(moduleName, initialDir, { moduleResolution: ts.ModuleResolutionKind.NodeJs, allowJs: true }, host, /*cache*/ undefined, /*jsOnly*/ true), resolvedModule = _a.resolvedModule, failedLookupLocations = _a.failedLookupLocations;
+        if (!resolvedModule) {
+            throw new Error("Could not resolve JS module '" + moduleName + "' starting at '" + initialDir + "'. Looked in: " + failedLookupLocations.join(", "));
+        }
+        return resolvedModule.resolvedFileName;
+    }
+    ts.resolveJavaScriptModule = resolveJavaScriptModule;
+    function nodeModuleNameResolverWorker(moduleName, containingDirectory, compilerOptions, host, cache, jsOnly) {
+        var traceEnabled = isTraceEnabled(compilerOptions, host);
+        var failedLookupLocations = [];
+        var state = { compilerOptions: compilerOptions, host: host, traceEnabled: traceEnabled };
+        var result = jsOnly ?
+            tryResolve(Extensions.JavaScript) :
+            (tryResolve(Extensions.TypeScript) ||
+                tryResolve(Extensions.JavaScript) ||
+                (compilerOptions.resolveJsonModule ? tryResolve(Extensions.Json) : undefined));
+        if (result && result.value) {
+            var _a = result.value, resolved = _a.resolved, originalPath = _a.originalPath, isExternalLibraryImport = _a.isExternalLibraryImport;
+            return createResolvedModuleWithFailedLookupLocations(resolved, originalPath, isExternalLibraryImport, failedLookupLocations);
+        }
+        return { resolvedModule: undefined, failedLookupLocations: failedLookupLocations };
+        function tryResolve(extensions) {
+            var loader = function (extensions, candidate, failedLookupLocations, onlyRecordFailures, state) { return nodeLoadModuleByRelativeName(extensions, candidate, failedLookupLocations, onlyRecordFailures, state, /*considerPackageJson*/ true); };
+            var resolved = tryLoadModuleUsingOptionalResolutionSettings(extensions, moduleName, containingDirectory, loader, failedLookupLocations, state);
+            if (resolved) {
+                return toSearchResult({ resolved: resolved, isExternalLibraryImport: false });
+            }
+            if (!ts.isExternalModuleNameRelative(moduleName)) {
+                if (traceEnabled) {
+                    trace(host, ts.Diagnostics.Loading_module_0_from_node_modules_folder_target_file_type_1, moduleName, Extensions[extensions]);
+                }
+                var resolved_1 = loadModuleFromNodeModules(extensions, moduleName, containingDirectory, failedLookupLocations, state, cache);
+                if (!resolved_1)
+                    return undefined;
+                var resolvedValue = resolved_1.value;
+                var originalPath = void 0;
+                if (!compilerOptions.preserveSymlinks && resolvedValue) {
+                    originalPath = resolvedValue.path;
+                    var path = realPath(resolvedValue.path, host, traceEnabled);
+                    if (path === originalPath) {
+                        originalPath = undefined;
+                    }
+                    resolvedValue = __assign({}, resolvedValue, { path: path });
+                }
+                // For node_modules lookups, get the real path so that multiple accesses to an `npm link`-ed module do not create duplicate files.
+                return { value: resolvedValue && { resolved: resolvedValue, originalPath: originalPath, isExternalLibraryImport: true } };
+            }
+            else {
+                var _a = ts.normalizePathAndParts(ts.combinePaths(containingDirectory, moduleName)), candidate = _a.path, parts = _a.parts;
+                var resolved_2 = nodeLoadModuleByRelativeName(extensions, candidate, failedLookupLocations, /*onlyRecordFailures*/ false, state, /*considerPackageJson*/ true);
+                // Treat explicit "node_modules" import as an external library import.
+                return resolved_2 && toSearchResult({ resolved: resolved_2, isExternalLibraryImport: ts.contains(parts, "node_modules") });
+            }
+        }
+    }
+    function realPath(path, host, traceEnabled) {
+        if (!host.realpath) {
+            return path;
+        }
+        var real = ts.normalizePath(host.realpath(path));
+        if (traceEnabled) {
+            trace(host, ts.Diagnostics.Resolving_real_path_for_0_result_1, path, real);
+        }
+        ts.Debug.assert(host.fileExists(real), path + " linked to nonexistent file " + real); // tslint:disable-line
+        return real;
+    }
+    function nodeLoadModuleByRelativeName(extensions, candidate, failedLookupLocations, onlyRecordFailures, state, considerPackageJson) {
+        if (state.traceEnabled) {
+            trace(state.host, ts.Diagnostics.Loading_module_as_file_Slash_folder_candidate_module_location_0_target_file_type_1, candidate, Extensions[extensions]);
+        }
+        if (!ts.hasTrailingDirectorySeparator(candidate)) {
+            if (!onlyRecordFailures) {
+                var parentOfCandidate = ts.getDirectoryPath(candidate);
+                if (!directoryProbablyExists(parentOfCandidate, state.host)) {
+                    if (state.traceEnabled) {
+                        trace(state.host, ts.Diagnostics.Directory_0_does_not_exist_skipping_all_lookups_in_it, parentOfCandidate);
+                    }
+                    onlyRecordFailures = true;
+                }
+            }
+            var resolvedFromFile = loadModuleFromFile(extensions, candidate, failedLookupLocations, onlyRecordFailures, state);
+            if (resolvedFromFile) {
+                var nm = considerPackageJson ? parseNodeModuleFromPath(resolvedFromFile) : undefined;
+                var packageId = nm && getPackageJsonInfo(nm.packageDirectory, nm.subModuleName, failedLookupLocations, /*onlyRecordFailures*/ false, state).packageId;
+                return withPackageId(packageId, resolvedFromFile);
+            }
+        }
+        if (!onlyRecordFailures) {
+            var candidateExists = directoryProbablyExists(candidate, state.host);
+            if (!candidateExists) {
+                if (state.traceEnabled) {
+                    trace(state.host, ts.Diagnostics.Directory_0_does_not_exist_skipping_all_lookups_in_it, candidate);
+                }
+                onlyRecordFailures = true;
+            }
+        }
+        return loadNodeModuleFromDirectory(extensions, candidate, failedLookupLocations, onlyRecordFailures, state, considerPackageJson);
+    }
+    var nodeModulesPathPart = "/node_modules/";
+    /**
+     * This will be called on the successfully resolved path from `loadModuleFromFile`.
+     * (Not neeeded for `loadModuleFromNodeModules` as that looks up the `package.json` as part of resolution.)
+     *
+     * packageDirectory is the directory of the package itself.
+     * subModuleName is the path within the package.
+     *   For `blah/node_modules/foo/index.d.ts` this is { packageDirectory: "foo", subModuleName: "index.d.ts" }. (Part before "/node_modules/" is ignored.)
+     *   For `/node_modules/foo/bar.d.ts` this is { packageDirectory: "foo", subModuleName": "bar/index.d.ts" }.
+     *   For `/node_modules/@types/foo/bar/index.d.ts` this is { packageDirectory: "@types/foo", subModuleName: "bar/index.d.ts" }.
+     *   For `/node_modules/foo/bar/index.d.ts` this is { packageDirectory: "foo", subModuleName": "bar/index.d.ts" }.
+     */
+    function parseNodeModuleFromPath(resolved) {
+        var path = ts.normalizePath(resolved.path);
+        var idx = path.lastIndexOf(nodeModulesPathPart);
+        if (idx === -1) {
+            return undefined;
+        }
+        var indexAfterNodeModules = idx + nodeModulesPathPart.length;
+        var indexAfterPackageName = moveToNextDirectorySeparatorIfAvailable(path, indexAfterNodeModules);
+        if (path.charCodeAt(indexAfterNodeModules) === 64 /* at */) {
+            indexAfterPackageName = moveToNextDirectorySeparatorIfAvailable(path, indexAfterPackageName);
+        }
+        var packageDirectory = path.slice(0, indexAfterPackageName);
+        var subModuleName = ts.removeExtension(path.slice(indexAfterPackageName + 1), resolved.ext) + ".d.ts" /* Dts */;
+        return { packageDirectory: packageDirectory, subModuleName: subModuleName };
+    }
+    function moveToNextDirectorySeparatorIfAvailable(path, prevSeparatorIndex) {
+        var nextSeparatorIndex = path.indexOf(ts.directorySeparator, prevSeparatorIndex + 1);
+        return nextSeparatorIndex === -1 ? prevSeparatorIndex : nextSeparatorIndex;
+    }
+    function addExtensionAndIndex(path) {
+        if (path === "") {
+            return "index.d.ts";
+        }
+        if (ts.endsWith(path, ".d.ts")) {
+            return path;
+        }
+        if (ts.endsWith(path, "/index")) {
+            return path + ".d.ts";
+        }
+        return path + "/index.d.ts";
+    }
+    /* @internal */
+    function directoryProbablyExists(directoryName, host) {
+        // if host does not support 'directoryExists' assume that directory will exist
+        return !host.directoryExists || host.directoryExists(directoryName);
+    }
+    ts.directoryProbablyExists = directoryProbablyExists;
+    function loadModuleFromFileNoPackageId(extensions, candidate, failedLookupLocations, onlyRecordFailures, state) {
+        return noPackageId(loadModuleFromFile(extensions, candidate, failedLookupLocations, onlyRecordFailures, state));
+    }
+    /**
+     * @param {boolean} onlyRecordFailures - if true then function won't try to actually load files but instead record all attempts as failures. This flag is necessary
+     * in cases when we know upfront that all load attempts will fail (because containing folder does not exists) however we still need to record all failed lookup locations.
+     */
+    function loadModuleFromFile(extensions, candidate, failedLookupLocations, onlyRecordFailures, state) {
+        if (extensions === Extensions.Json) {
+            var extensionLess = ts.tryRemoveExtension(candidate, ".json" /* Json */);
+            return extensionLess === undefined ? undefined : tryAddingExtensions(extensionLess, extensions, failedLookupLocations, onlyRecordFailures, state);
+        }
+        // First, try adding an extension. An import of "foo" could be matched by a file "foo.ts", or "foo.js" by "foo.js.ts"
+        var resolvedByAddingExtension = tryAddingExtensions(candidate, extensions, failedLookupLocations, onlyRecordFailures, state);
+        if (resolvedByAddingExtension) {
+            return resolvedByAddingExtension;
+        }
+        // If that didn't work, try stripping a ".js" or ".jsx" extension and replacing it with a TypeScript one;
+        // e.g. "./foo.js" can be matched by "./foo.ts" or "./foo.d.ts"
+        if (ts.hasJavaScriptFileExtension(candidate)) {
+            var extensionless = ts.removeFileExtension(candidate);
+            if (state.traceEnabled) {
+                var extension = candidate.substring(extensionless.length);
+                trace(state.host, ts.Diagnostics.File_name_0_has_a_1_extension_stripping_it, candidate, extension);
+            }
+            return tryAddingExtensions(extensionless, extensions, failedLookupLocations, onlyRecordFailures, state);
+        }
+    }
+    /** Try to return an existing file that adds one of the `extensions` to `candidate`. */
+    function tryAddingExtensions(candidate, extensions, failedLookupLocations, onlyRecordFailures, state) {
+        if (!onlyRecordFailures) {
+            // check if containing folder exists - if it doesn't then just record failures for all supported extensions without disk probing
+            var directory = ts.getDirectoryPath(candidate);
+            if (directory) {
+                onlyRecordFailures = !directoryProbablyExists(directory, state.host);
+            }
+        }
+        switch (extensions) {
+            case Extensions.DtsOnly:
+                return tryExtension(".d.ts" /* Dts */);
+            case Extensions.TypeScript:
+                return tryExtension(".ts" /* Ts */) || tryExtension(".tsx" /* Tsx */) || tryExtension(".d.ts" /* Dts */);
+            case Extensions.JavaScript:
+                return tryExtension(".js" /* Js */) || tryExtension(".jsx" /* Jsx */);
+            case Extensions.Json:
+                return tryExtension(".json" /* Json */);
+        }
+        function tryExtension(ext) {
+            var path = tryFile(candidate + ext, failedLookupLocations, onlyRecordFailures, state);
+            return path === undefined ? undefined : { path: path, ext: ext };
+        }
+    }
+    /** Return the file if it exists. */
+    function tryFile(fileName, failedLookupLocations, onlyRecordFailures, state) {
+        if (!onlyRecordFailures) {
+            if (state.host.fileExists(fileName)) {
+                if (state.traceEnabled) {
+                    trace(state.host, ts.Diagnostics.File_0_exist_use_it_as_a_name_resolution_result, fileName);
+                }
+                return fileName;
+            }
+            else {
+                if (state.traceEnabled) {
+                    trace(state.host, ts.Diagnostics.File_0_does_not_exist, fileName);
+                }
+            }
+        }
+        failedLookupLocations.push(fileName);
+        return undefined;
+    }
+    function loadNodeModuleFromDirectory(extensions, candidate, failedLookupLocations, onlyRecordFailures, state, considerPackageJson) {
+        if (considerPackageJson === void 0) { considerPackageJson = true; }
+        var _a = considerPackageJson
+            ? getPackageJsonInfo(candidate, "", failedLookupLocations, onlyRecordFailures, state)
+            : { packageJsonContent: undefined, packageId: undefined }, packageJsonContent = _a.packageJsonContent, packageId = _a.packageId;
+        return withPackageId(packageId, loadNodeModuleFromDirectoryWorker(extensions, candidate, failedLookupLocations, onlyRecordFailures, state, packageJsonContent));
+    }
+    function loadNodeModuleFromDirectoryWorker(extensions, candidate, failedLookupLocations, onlyRecordFailures, state, packageJsonContent) {
+        var fromPackageJson = packageJsonContent && loadModuleFromPackageJson(packageJsonContent, extensions, candidate, failedLookupLocations, state);
+        if (fromPackageJson) {
+            return fromPackageJson;
+        }
+        var directoryExists = !onlyRecordFailures && directoryProbablyExists(candidate, state.host);
+        return loadModuleFromFile(extensions, ts.combinePaths(candidate, "index"), failedLookupLocations, !directoryExists, state);
+    }
+    function getPackageJsonInfo(nodeModuleDirectory, subModuleName, failedLookupLocations, onlyRecordFailures, state) {
+        var host = state.host, traceEnabled = state.traceEnabled;
+        var directoryExists = !onlyRecordFailures && directoryProbablyExists(nodeModuleDirectory, host);
+        var packageJsonPath = pathToPackageJson(nodeModuleDirectory);
+        if (directoryExists && host.fileExists(packageJsonPath)) {
+            var packageJsonContent = readJson(packageJsonPath, host);
+            if (subModuleName === "") { // looking up the root - need to handle types/typings/main redirects for subModuleName
+                var path = tryReadPackageJsonFields(/*readTypes*/ true, packageJsonContent, nodeModuleDirectory, state);
+                if (typeof path === "string") {
+                    subModuleName = addExtensionAndIndex(path.substring(nodeModuleDirectory.length + 1));
+                }
+                else {
+                    var jsPath = tryReadPackageJsonFields(/*readTypes*/ false, packageJsonContent, nodeModuleDirectory, state);
+                    if (typeof jsPath === "string" && jsPath.length > nodeModuleDirectory.length) {
+                        var potentialSubModule_1 = jsPath.substring(nodeModuleDirectory.length + 1);
+                        subModuleName = (ts.forEach(ts.supportedJavascriptExtensions, function (extension) {
+                            return ts.tryRemoveExtension(potentialSubModule_1, extension);
+                        }) || potentialSubModule_1) + ".d.ts" /* Dts */;
+                    }
+                    else {
+                        subModuleName = "index.d.ts";
+                    }
+                }
+            }
+            if (!ts.endsWith(subModuleName, ".d.ts" /* Dts */)) {
+                subModuleName = addExtensionAndIndex(subModuleName);
+            }
+            var packageId = typeof packageJsonContent.name === "string" && typeof packageJsonContent.version === "string"
+                ? { name: packageJsonContent.name, subModuleName: subModuleName, version: packageJsonContent.version }
+                : undefined;
+            if (traceEnabled) {
+                if (packageId) {
+                    trace(host, ts.Diagnostics.Found_package_json_at_0_Package_ID_is_1, packageJsonPath, ts.packageIdToString(packageId));
+                }
+                else {
+                    trace(host, ts.Diagnostics.Found_package_json_at_0, packageJsonPath);
+                }
+            }
+            return { found: true, packageJsonContent: packageJsonContent, packageId: packageId };
+        }
+        else {
+            if (directoryExists && traceEnabled) {
+                trace(host, ts.Diagnostics.File_0_does_not_exist, packageJsonPath);
+            }
+            // record package json as one of failed lookup locations - in the future if this file will appear it will invalidate resolution results
+            failedLookupLocations.push(packageJsonPath);
+            return { found: false, packageJsonContent: undefined, packageId: undefined };
+        }
+    }
+    function loadModuleFromPackageJson(jsonContent, extensions, candidate, failedLookupLocations, state) {
+        var file = tryReadPackageJsonFields(extensions !== Extensions.JavaScript && extensions !== Extensions.Json, jsonContent, candidate, state);
+        if (!file) {
+            if (extensions === Extensions.TypeScript) {
+                // When resolving typescript modules, try resolving using main field as well
+                file = tryReadPackageJsonFields(/*readTypes*/ false, jsonContent, candidate, state);
+                if (!file) {
+                    return undefined;
+                }
+            }
+            else {
+                return undefined;
+            }
+        }
+        var onlyRecordFailures = !directoryProbablyExists(ts.getDirectoryPath(file), state.host);
+        var fromFile = tryFile(file, failedLookupLocations, onlyRecordFailures, state);
+        if (fromFile) {
+            var resolved = resolvedIfExtensionMatches(extensions, fromFile);
+            if (resolved) {
+                return resolved;
+            }
+            if (state.traceEnabled) {
+                trace(state.host, ts.Diagnostics.File_0_has_an_unsupported_extension_so_skipping_it, fromFile);
+            }
+        }
+        // Even if extensions is DtsOnly, we can still look up a .ts file as a result of package.json "types"
+        var nextExtensions = extensions === Extensions.DtsOnly ? Extensions.TypeScript : extensions;
+        // Don't do package.json lookup recursively, because Node.js' package lookup doesn't.
+        var result = nodeLoadModuleByRelativeName(nextExtensions, file, failedLookupLocations, onlyRecordFailures, state, /*considerPackageJson*/ false);
+        if (result) {
+            // It won't have a `packageId` set, because we disabled `considerPackageJson`.
+            ts.Debug.assert(result.packageId === undefined);
+            return { path: result.path, ext: result.extension };
+        }
+    }
+    /** Resolve from an arbitrarily specified file. Return `undefined` if it has an unsupported extension. */
+    function resolvedIfExtensionMatches(extensions, path) {
+        var ext = ts.tryGetExtensionFromPath(path);
+        return ext !== undefined && extensionIsOk(extensions, ext) ? { path: path, ext: ext } : undefined;
+    }
+    /** True if `extension` is one of the supported `extensions`. */
+    function extensionIsOk(extensions, extension) {
+        switch (extensions) {
+            case Extensions.JavaScript:
+                return extension === ".js" /* Js */ || extension === ".jsx" /* Jsx */;
+            case Extensions.Json:
+                return extension === ".json" /* Json */;
+            case Extensions.TypeScript:
+                return extension === ".ts" /* Ts */ || extension === ".tsx" /* Tsx */ || extension === ".d.ts" /* Dts */;
+            case Extensions.DtsOnly:
+                return extension === ".d.ts" /* Dts */;
+        }
+    }
+    function pathToPackageJson(directory) {
+        return ts.combinePaths(directory, "package.json");
+    }
+    function loadModuleFromNodeModulesFolder(extensions, moduleName, nodeModulesFolder, nodeModulesFolderExists, failedLookupLocations, state) {
+        var candidate = ts.normalizePath(ts.combinePaths(nodeModulesFolder, moduleName));
+        // First look for a nested package.json, as in `node_modules/foo/bar/package.json`.
+        var packageJsonContent;
+        var packageId;
+        var packageInfo = getPackageJsonInfo(candidate, "", failedLookupLocations, /*onlyRecordFailures*/ !nodeModulesFolderExists, state);
+        if (packageInfo.found) {
+            (packageJsonContent = packageInfo.packageJsonContent, packageId = packageInfo.packageId);
+        }
+        else {
+            var _a = getPackageName(moduleName), packageName = _a.packageName, rest = _a.rest;
+            if (rest !== "") { // If "rest" is empty, we just did this search above.
+                var packageRootPath = ts.combinePaths(nodeModulesFolder, packageName);
+                // Don't use a "types" or "main" from here because we're not loading the root, but a subdirectory -- just here for the packageId.
+                packageId = getPackageJsonInfo(packageRootPath, rest, failedLookupLocations, !nodeModulesFolderExists, state).packageId;
+            }
+        }
+        var pathAndExtension = loadModuleFromFile(extensions, candidate, failedLookupLocations, !nodeModulesFolderExists, state) ||
+            loadNodeModuleFromDirectoryWorker(extensions, candidate, failedLookupLocations, !nodeModulesFolderExists, state, packageJsonContent);
+        return withPackageId(packageId, pathAndExtension);
+    }
+    /* @internal */
+    function getPackageName(moduleName) {
+        var idx = moduleName.indexOf(ts.directorySeparator);
+        if (moduleName[0] === "@") {
+            idx = moduleName.indexOf(ts.directorySeparator, idx + 1);
+        }
+        return idx === -1 ? { packageName: moduleName, rest: "" } : { packageName: moduleName.slice(0, idx), rest: moduleName.slice(idx + 1) };
+    }
+    ts.getPackageName = getPackageName;
+    function loadModuleFromNodeModules(extensions, moduleName, directory, failedLookupLocations, state, cache) {
+        return loadModuleFromNodeModulesWorker(extensions, moduleName, directory, failedLookupLocations, state, /*typesOnly*/ false, cache);
+    }
+    function loadModuleFromNodeModulesAtTypes(moduleName, directory, failedLookupLocations, state) {
+        // Extensions parameter here doesn't actually matter, because typesOnly ensures we're just doing @types lookup, which is always DtsOnly.
+        return loadModuleFromNodeModulesWorker(Extensions.DtsOnly, moduleName, directory, failedLookupLocations, state, /*typesOnly*/ true, /*cache*/ undefined);
+    }
+    function loadModuleFromNodeModulesWorker(extensions, moduleName, directory, failedLookupLocations, state, typesOnly, cache) {
+        var perModuleNameCache = cache && cache.getOrCreateCacheForModuleName(moduleName);
+        return ts.forEachAncestorDirectory(ts.normalizeSlashes(directory), function (ancestorDirectory) {
+            if (ts.getBaseFileName(ancestorDirectory) !== "node_modules") {
+                var resolutionFromCache = tryFindNonRelativeModuleNameInCache(perModuleNameCache, moduleName, ancestorDirectory, state.traceEnabled, state.host, failedLookupLocations);
+                if (resolutionFromCache) {
+                    return resolutionFromCache;
+                }
+                return toSearchResult(loadModuleFromNodeModulesOneLevel(extensions, moduleName, ancestorDirectory, failedLookupLocations, state, typesOnly));
+            }
+        });
+    }
+    /** Load a module from a single node_modules directory, but not from any ancestors' node_modules directories. */
+    function loadModuleFromNodeModulesOneLevel(extensions, moduleName, directory, failedLookupLocations, state, typesOnly) {
+        if (typesOnly === void 0) { typesOnly = false; }
+        var nodeModulesFolder = ts.combinePaths(directory, "node_modules");
+        var nodeModulesFolderExists = directoryProbablyExists(nodeModulesFolder, state.host);
+        if (!nodeModulesFolderExists && state.traceEnabled) {
+            trace(state.host, ts.Diagnostics.Directory_0_does_not_exist_skipping_all_lookups_in_it, nodeModulesFolder);
+        }
+        var packageResult = typesOnly ? undefined : loadModuleFromNodeModulesFolder(extensions, moduleName, nodeModulesFolder, nodeModulesFolderExists, failedLookupLocations, state);
+        if (packageResult) {
+            return packageResult;
+        }
+        if (extensions !== Extensions.JavaScript && extensions !== Extensions.Json) {
+            var nodeModulesAtTypes_1 = ts.combinePaths(nodeModulesFolder, "@types");
+            var nodeModulesAtTypesExists = nodeModulesFolderExists;
+            if (nodeModulesFolderExists && !directoryProbablyExists(nodeModulesAtTypes_1, state.host)) {
+                if (state.traceEnabled) {
+                    trace(state.host, ts.Diagnostics.Directory_0_does_not_exist_skipping_all_lookups_in_it, nodeModulesAtTypes_1);
+                }
+                nodeModulesAtTypesExists = false;
+            }
+            return loadModuleFromNodeModulesFolder(Extensions.DtsOnly, mangleScopedPackage(moduleName, state), nodeModulesAtTypes_1, nodeModulesAtTypesExists, failedLookupLocations, state);
+        }
+    }
+    /** Double underscores are used in DefinitelyTyped to delimit scoped packages. */
+    var mangledScopedPackageSeparator = "__";
+    /** For a scoped package, we must look in `@types/foo__bar` instead of `@types/@foo/bar`. */
+    function mangleScopedPackage(packageName, state) {
+        var mangled = getMangledNameForScopedPackage(packageName);
+        if (state.traceEnabled && mangled !== packageName) {
+            trace(state.host, ts.Diagnostics.Scoped_package_detected_looking_in_0, mangled);
+        }
+        return mangled;
+    }
+    /* @internal */
+    function getTypesPackageName(packageName) {
+        return "@types/" + getMangledNameForScopedPackage(packageName);
+    }
+    ts.getTypesPackageName = getTypesPackageName;
+    /* @internal */
+    function getMangledNameForScopedPackage(packageName) {
+        if (ts.startsWith(packageName, "@")) {
+            var replaceSlash = packageName.replace(ts.directorySeparator, mangledScopedPackageSeparator);
+            if (replaceSlash !== packageName) {
+                return replaceSlash.slice(1); // Take off the "@"
+            }
+        }
+        return packageName;
+    }
+    ts.getMangledNameForScopedPackage = getMangledNameForScopedPackage;
+    /* @internal */
+    function getPackageNameFromAtTypesDirectory(mangledName) {
+        var withoutAtTypePrefix = ts.removePrefix(mangledName, "@types/");
+        if (withoutAtTypePrefix !== mangledName) {
+            return getUnmangledNameForScopedPackage(withoutAtTypePrefix);
+        }
+        return mangledName;
+    }
+    ts.getPackageNameFromAtTypesDirectory = getPackageNameFromAtTypesDirectory;
+    /* @internal */
+    function getUnmangledNameForScopedPackage(typesPackageName) {
+        return ts.stringContains(typesPackageName, mangledScopedPackageSeparator) ?
+            "@" + typesPackageName.replace(mangledScopedPackageSeparator, ts.directorySeparator) :
+            typesPackageName;
+    }
+    ts.getUnmangledNameForScopedPackage = getUnmangledNameForScopedPackage;
+    function tryFindNonRelativeModuleNameInCache(cache, moduleName, containingDirectory, traceEnabled, host, failedLookupLocations) {
+        var result = cache && cache.get(containingDirectory);
+        if (result) {
+            if (traceEnabled) {
+                trace(host, ts.Diagnostics.Resolution_for_module_0_was_found_in_cache_from_location_1, moduleName, containingDirectory);
+            }
+            failedLookupLocations.push.apply(failedLookupLocations, result.failedLookupLocations);
+            return { value: result.resolvedModule && { path: result.resolvedModule.resolvedFileName, extension: result.resolvedModule.extension, packageId: result.resolvedModule.packageId } };
+        }
+    }
+    function classicNameResolver(moduleName, containingFile, compilerOptions, host, cache) {
+        var traceEnabled = isTraceEnabled(compilerOptions, host);
+        var state = { compilerOptions: compilerOptions, host: host, traceEnabled: traceEnabled };
+        var failedLookupLocations = [];
+        var containingDirectory = ts.getDirectoryPath(containingFile);
+        var resolved = tryResolve(Extensions.TypeScript) || tryResolve(Extensions.JavaScript);
+        // No originalPath because classic resolution doesn't resolve realPath
+        return createResolvedModuleWithFailedLookupLocations(resolved && resolved.value, /*originalPath*/ undefined, /*isExternalLibraryImport*/ false, failedLookupLocations);
+        function tryResolve(extensions) {
+            var resolvedUsingSettings = tryLoadModuleUsingOptionalResolutionSettings(extensions, moduleName, containingDirectory, loadModuleFromFileNoPackageId, failedLookupLocations, state);
+            if (resolvedUsingSettings) {
+                return { value: resolvedUsingSettings };
+            }
+            var perModuleNameCache = cache && cache.getOrCreateCacheForModuleName(moduleName);
+            if (!ts.isExternalModuleNameRelative(moduleName)) {
+                // Climb up parent directories looking for a module.
+                var resolved_3 = ts.forEachAncestorDirectory(containingDirectory, function (directory) {
+                    var resolutionFromCache = tryFindNonRelativeModuleNameInCache(perModuleNameCache, moduleName, directory, traceEnabled, host, failedLookupLocations);
+                    if (resolutionFromCache) {
+                        return resolutionFromCache;
+                    }
+                    var searchName = ts.normalizePath(ts.combinePaths(directory, moduleName));
+                    return toSearchResult(loadModuleFromFileNoPackageId(extensions, searchName, failedLookupLocations, /*onlyRecordFailures*/ false, state));
+                });
+                if (resolved_3) {
+                    return resolved_3;
+                }
+                if (extensions === Extensions.TypeScript) {
+                    // If we didn't find the file normally, look it up in @types.
+                    return loadModuleFromNodeModulesAtTypes(moduleName, containingDirectory, failedLookupLocations, state);
+                }
+            }
+            else {
+                var candidate = ts.normalizePath(ts.combinePaths(containingDirectory, moduleName));
+                return toSearchResult(loadModuleFromFileNoPackageId(extensions, candidate, failedLookupLocations, /*onlyRecordFailures*/ false, state));
+            }
+        }
+    }
+    ts.classicNameResolver = classicNameResolver;
+    /**
+     * LSHost may load a module from a global cache of typings.
+     * This is the minumum code needed to expose that functionality; the rest is in LSHost.
+     */
+    /* @internal */
+    function loadModuleFromGlobalCache(moduleName, projectName, compilerOptions, host, globalCache) {
+        var traceEnabled = isTraceEnabled(compilerOptions, host);
+        if (traceEnabled) {
+            trace(host, ts.Diagnostics.Auto_discovery_for_typings_is_enabled_in_project_0_Running_extra_resolution_pass_for_module_1_using_cache_location_2, projectName, moduleName, globalCache);
+        }
+        var state = { compilerOptions: compilerOptions, host: host, traceEnabled: traceEnabled };
+        var failedLookupLocations = [];
+        var resolved = loadModuleFromNodeModulesOneLevel(Extensions.DtsOnly, moduleName, globalCache, failedLookupLocations, state);
+        return createResolvedModuleWithFailedLookupLocations(resolved, /*originalPath*/ undefined, /*isExternalLibraryImport*/ true, failedLookupLocations);
+    }
+    ts.loadModuleFromGlobalCache = loadModuleFromGlobalCache;
+    /**
+     * Wraps value to SearchResult.
+     * @returns undefined if value is undefined or { value } otherwise
+     */
+    function toSearchResult(value) {
+        return value !== undefined ? { value: value } : undefined;
+    }
+})(ts || (ts = {}));
+//# sourceMappingURL=parser.js.map
+"use strict";
+var __assign = (this && this.__assign) || Object.assign || function(t) {
+    for (var s, i = 1, n = arguments.length; i < n; i++) {
+        s = arguments[i];
+        for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
+            t[p] = s[p];
+    }
+    return t;
+};
+var __makeTemplateObject = (this && this.__makeTemplateObject) || function (cooked, raw) {
+    if (Object.defineProperty) { Object.defineProperty(cooked, "raw", { value: raw }); } else { cooked.raw = raw; }
+    return cooked;
+};
 /* @internal */
 var ts;
 (function (ts) {
@@ -22025,7 +25539,7 @@ var ts;
             if (symbolFlags & 67216319 /* Value */) {
                 var valueDeclaration = symbol.valueDeclaration;
                 if (!valueDeclaration ||
-                    (valueDeclaration.kind !== node.kind && valueDeclaration.kind === 239 /* ModuleDeclaration */)) {
+                    (valueDeclaration.kind !== node.kind && ts.isEffectiveModuleDeclaration(valueDeclaration))) {
                     // other kinds of value declarations take precedence over modules
                     symbol.valueDeclaration = node;
                 }
@@ -22379,8 +25893,8 @@ var ts;
                 var savedSubtreeTransformFlags = subtreeTransformFlags;
                 subtreeTransformFlags = 0 /* None */;
                 var nodeArrayFlags = 0 /* None */;
-                for (var _i = 0, nodes_2 = nodes; _i < nodes_2.length; _i++) {
-                    var node = nodes_2[_i];
+                for (var _i = 0, nodes_1 = nodes; _i < nodes_1.length; _i++) {
+                    var node = nodes_1[_i];
                     bindFunction(node);
                     nodeArrayFlags |= node.transformFlags & ~536870912 /* HasComputedFlags */;
                 }
@@ -25405,1126 +28919,6 @@ var ts;
     }
     ts.createGetSymbolWalker = createGetSymbolWalker;
 })(ts || (ts = {}));
-var ts;
-(function (ts) {
-    function trace(host) {
-        host.trace(ts.formatMessage.apply(undefined, arguments));
-    }
-    ts.trace = trace;
-    /* @internal */
-    function isTraceEnabled(compilerOptions, host) {
-        return !!compilerOptions.traceResolution && host.trace !== undefined;
-    }
-    ts.isTraceEnabled = isTraceEnabled;
-    function withPackageId(packageId, r) {
-        return r && { path: r.path, extension: r.ext, packageId: packageId };
-    }
-    function noPackageId(r) {
-        return withPackageId(/*packageId*/ undefined, r);
-    }
-    /**
-     * Kinds of file that we are currently looking for.
-     * Typically there is one pass with Extensions.TypeScript, then a second pass with Extensions.JavaScript.
-     */
-    var Extensions;
-    (function (Extensions) {
-        Extensions[Extensions["TypeScript"] = 0] = "TypeScript";
-        Extensions[Extensions["JavaScript"] = 1] = "JavaScript";
-        Extensions[Extensions["Json"] = 2] = "Json";
-        Extensions[Extensions["DtsOnly"] = 3] = "DtsOnly"; /** Only '.d.ts' */
-    })(Extensions || (Extensions = {}));
-    /** Used with `Extensions.DtsOnly` to extract the path from TypeScript results. */
-    function resolvedTypeScriptOnly(resolved) {
-        if (!resolved) {
-            return undefined;
-        }
-        ts.Debug.assert(ts.extensionIsTypeScript(resolved.extension));
-        return { fileName: resolved.path, packageId: resolved.packageId };
-    }
-    function createResolvedModuleWithFailedLookupLocations(resolved, originalPath, isExternalLibraryImport, failedLookupLocations) {
-        return {
-            resolvedModule: resolved && { resolvedFileName: resolved.path, originalPath: originalPath, extension: resolved.extension, isExternalLibraryImport: isExternalLibraryImport, packageId: resolved.packageId },
-            failedLookupLocations: failedLookupLocations
-        };
-    }
-    /** Reads from "main" or "types"/"typings" depending on `extensions`. */
-    function tryReadPackageJsonFields(readTypes, jsonContent, baseDirectory, state) {
-        return readTypes ? tryReadFromField("typings") || tryReadFromField("types") : tryReadFromField("main");
-        function tryReadFromField(fieldName) {
-            if (!ts.hasProperty(jsonContent, fieldName)) {
-                if (state.traceEnabled) {
-                    trace(state.host, ts.Diagnostics.package_json_does_not_have_a_0_field, fieldName);
-                }
-                return;
-            }
-            var fileName = jsonContent[fieldName];
-            if (!ts.isString(fileName)) {
-                if (state.traceEnabled) {
-                    trace(state.host, ts.Diagnostics.Expected_type_of_0_field_in_package_json_to_be_string_got_1, fieldName, typeof fileName);
-                }
-                return;
-            }
-            var path = ts.normalizePath(ts.combinePaths(baseDirectory, fileName));
-            if (state.traceEnabled) {
-                trace(state.host, ts.Diagnostics.package_json_has_0_field_1_that_references_2, fieldName, fileName, path);
-            }
-            return path;
-        }
-    }
-    /* @internal */
-    function readJson(path, host) {
-        try {
-            var jsonText = host.readFile(path);
-            if (!jsonText)
-                return {};
-            var result = ts.parseConfigFileTextToJson(path, jsonText);
-            if (result.error) {
-                return {};
-            }
-            return result.config;
-        }
-        catch (e) {
-            // gracefully handle if readFile fails or returns not JSON
-            return {};
-        }
-    }
-    ts.readJson = readJson;
-    function getEffectiveTypeRoots(options, host) {
-        if (options.typeRoots) {
-            return options.typeRoots;
-        }
-        var currentDirectory;
-        if (options.configFilePath) {
-            currentDirectory = ts.getDirectoryPath(options.configFilePath);
-        }
-        else if (host.getCurrentDirectory) {
-            currentDirectory = host.getCurrentDirectory();
-        }
-        if (currentDirectory !== undefined) {
-            return getDefaultTypeRoots(currentDirectory, host);
-        }
-    }
-    ts.getEffectiveTypeRoots = getEffectiveTypeRoots;
-    /**
-     * Returns the path to every node_modules/@types directory from some ancestor directory.
-     * Returns undefined if there are none.
-     */
-    function getDefaultTypeRoots(currentDirectory, host) {
-        if (!host.directoryExists) {
-            return [ts.combinePaths(currentDirectory, nodeModulesAtTypes)];
-            // And if it doesn't exist, tough.
-        }
-        var typeRoots;
-        ts.forEachAncestorDirectory(ts.normalizePath(currentDirectory), function (directory) {
-            var atTypes = ts.combinePaths(directory, nodeModulesAtTypes);
-            if (host.directoryExists(atTypes)) {
-                (typeRoots || (typeRoots = [])).push(atTypes);
-            }
-            return undefined;
-        });
-        return typeRoots;
-    }
-    var nodeModulesAtTypes = ts.combinePaths("node_modules", "@types");
-    /**
-     * @param {string | undefined} containingFile - file that contains type reference directive, can be undefined if containing file is unknown.
-     * This is possible in case if resolution is performed for directives specified via 'types' parameter. In this case initial path for secondary lookups
-     * is assumed to be the same as root directory of the project.
-     */
-    function resolveTypeReferenceDirective(typeReferenceDirectiveName, containingFile, options, host) {
-        var traceEnabled = isTraceEnabled(options, host);
-        var moduleResolutionState = { compilerOptions: options, host: host, traceEnabled: traceEnabled };
-        var typeRoots = getEffectiveTypeRoots(options, host);
-        if (traceEnabled) {
-            if (containingFile === undefined) {
-                if (typeRoots === undefined) {
-                    trace(host, ts.Diagnostics.Resolving_type_reference_directive_0_containing_file_not_set_root_directory_not_set, typeReferenceDirectiveName);
-                }
-                else {
-                    trace(host, ts.Diagnostics.Resolving_type_reference_directive_0_containing_file_not_set_root_directory_1, typeReferenceDirectiveName, typeRoots);
-                }
-            }
-            else {
-                if (typeRoots === undefined) {
-                    trace(host, ts.Diagnostics.Resolving_type_reference_directive_0_containing_file_1_root_directory_not_set, typeReferenceDirectiveName, containingFile);
-                }
-                else {
-                    trace(host, ts.Diagnostics.Resolving_type_reference_directive_0_containing_file_1_root_directory_2, typeReferenceDirectiveName, containingFile, typeRoots);
-                }
-            }
-        }
-        var failedLookupLocations = [];
-        var resolved = primaryLookup();
-        var primary = true;
-        if (!resolved) {
-            resolved = secondaryLookup();
-            primary = false;
-        }
-        var resolvedTypeReferenceDirective;
-        if (resolved) {
-            if (!options.preserveSymlinks) {
-                resolved = __assign({}, resolved, { fileName: realPath(resolved.fileName, host, traceEnabled) });
-            }
-            if (traceEnabled) {
-                trace(host, ts.Diagnostics.Type_reference_directive_0_was_successfully_resolved_to_1_primary_Colon_2, typeReferenceDirectiveName, resolved.fileName, primary);
-            }
-            resolvedTypeReferenceDirective = { primary: primary, resolvedFileName: resolved.fileName, packageId: resolved.packageId };
-        }
-        return { resolvedTypeReferenceDirective: resolvedTypeReferenceDirective, failedLookupLocations: failedLookupLocations };
-        function primaryLookup() {
-            // Check primary library paths
-            if (typeRoots && typeRoots.length) {
-                if (traceEnabled) {
-                    trace(host, ts.Diagnostics.Resolving_with_primary_search_path_0, typeRoots.join(", "));
-                }
-                return ts.forEach(typeRoots, function (typeRoot) {
-                    var candidate = ts.combinePaths(typeRoot, typeReferenceDirectiveName);
-                    var candidateDirectory = ts.getDirectoryPath(candidate);
-                    var directoryExists = directoryProbablyExists(candidateDirectory, host);
-                    if (!directoryExists && traceEnabled) {
-                        trace(host, ts.Diagnostics.Directory_0_does_not_exist_skipping_all_lookups_in_it, candidateDirectory);
-                    }
-                    return resolvedTypeScriptOnly(loadNodeModuleFromDirectory(Extensions.DtsOnly, candidate, failedLookupLocations, !directoryExists, moduleResolutionState));
-                });
-            }
-            else {
-                if (traceEnabled) {
-                    trace(host, ts.Diagnostics.Root_directory_cannot_be_determined_skipping_primary_search_paths);
-                }
-            }
-        }
-        function secondaryLookup() {
-            var initialLocationForSecondaryLookup = containingFile && ts.getDirectoryPath(containingFile);
-            if (initialLocationForSecondaryLookup !== undefined) {
-                // check secondary locations
-                if (traceEnabled) {
-                    trace(host, ts.Diagnostics.Looking_up_in_node_modules_folder_initial_location_0, initialLocationForSecondaryLookup);
-                }
-                var result = loadModuleFromNodeModules(Extensions.DtsOnly, typeReferenceDirectiveName, initialLocationForSecondaryLookup, failedLookupLocations, moduleResolutionState, /*cache*/ undefined);
-                var resolvedFile = resolvedTypeScriptOnly(result && result.value);
-                if (!resolvedFile && traceEnabled) {
-                    trace(host, ts.Diagnostics.Type_reference_directive_0_was_not_resolved, typeReferenceDirectiveName);
-                }
-                return resolvedFile;
-            }
-            else {
-                if (traceEnabled) {
-                    trace(host, ts.Diagnostics.Containing_file_is_not_specified_and_root_directory_cannot_be_determined_skipping_lookup_in_node_modules_folder);
-                }
-            }
-        }
-    }
-    ts.resolveTypeReferenceDirective = resolveTypeReferenceDirective;
-    /**
-     * Given a set of options, returns the set of type directive names
-     *   that should be included for this program automatically.
-     * This list could either come from the config file,
-     *   or from enumerating the types root + initial secondary types lookup location.
-     * More type directives might appear in the program later as a result of loading actual source files;
-     *   this list is only the set of defaults that are implicitly included.
-     */
-    function getAutomaticTypeDirectiveNames(options, host) {
-        // Use explicit type list from tsconfig.json
-        if (options.types) {
-            return options.types;
-        }
-        // Walk the primary type lookup locations
-        var result = [];
-        if (host.directoryExists && host.getDirectories) {
-            var typeRoots = getEffectiveTypeRoots(options, host);
-            if (typeRoots) {
-                for (var _i = 0, typeRoots_1 = typeRoots; _i < typeRoots_1.length; _i++) {
-                    var root = typeRoots_1[_i];
-                    if (host.directoryExists(root)) {
-                        for (var _a = 0, _b = host.getDirectories(root); _a < _b.length; _a++) {
-                            var typeDirectivePath = _b[_a];
-                            var normalized = ts.normalizePath(typeDirectivePath);
-                            var packageJsonPath = pathToPackageJson(ts.combinePaths(root, normalized));
-                            // `types-publisher` sometimes creates packages with `"typings": null` for packages that don't provide their own types.
-                            // See `createNotNeededPackageJSON` in the types-publisher` repo.
-                            // tslint:disable-next-line:no-null-keyword
-                            var isNotNeededPackage = host.fileExists(packageJsonPath) && readJson(packageJsonPath, host).typings === null;
-                            if (!isNotNeededPackage) {
-                                // Return just the type directive names
-                                result.push(ts.getBaseFileName(normalized));
-                            }
-                        }
-                    }
-                }
-            }
-        }
-        return result;
-    }
-    ts.getAutomaticTypeDirectiveNames = getAutomaticTypeDirectiveNames;
-    function createModuleResolutionCache(currentDirectory, getCanonicalFileName) {
-        return createModuleResolutionCacheWithMaps(ts.createMap(), ts.createMap(), currentDirectory, getCanonicalFileName);
-    }
-    ts.createModuleResolutionCache = createModuleResolutionCache;
-    /*@internal*/
-    function createModuleResolutionCacheWithMaps(directoryToModuleNameMap, moduleNameToDirectoryMap, currentDirectory, getCanonicalFileName) {
-        return { getOrCreateCacheForDirectory: getOrCreateCacheForDirectory, getOrCreateCacheForModuleName: getOrCreateCacheForModuleName };
-        function getOrCreateCacheForDirectory(directoryName) {
-            var path = ts.toPath(directoryName, currentDirectory, getCanonicalFileName);
-            var perFolderCache = directoryToModuleNameMap.get(path);
-            if (!perFolderCache) {
-                perFolderCache = ts.createMap();
-                directoryToModuleNameMap.set(path, perFolderCache);
-            }
-            return perFolderCache;
-        }
-        function getOrCreateCacheForModuleName(nonRelativeModuleName) {
-            if (ts.isExternalModuleNameRelative(nonRelativeModuleName)) {
-                return undefined; // TODO: GH#18217
-            }
-            var perModuleNameCache = moduleNameToDirectoryMap.get(nonRelativeModuleName);
-            if (!perModuleNameCache) {
-                perModuleNameCache = createPerModuleNameCache();
-                moduleNameToDirectoryMap.set(nonRelativeModuleName, perModuleNameCache);
-            }
-            return perModuleNameCache;
-        }
-        function createPerModuleNameCache() {
-            var directoryPathMap = ts.createMap();
-            return { get: get, set: set };
-            function get(directory) {
-                return directoryPathMap.get(ts.toPath(directory, currentDirectory, getCanonicalFileName));
-            }
-            /**
-             * At first this function add entry directory -> module resolution result to the table.
-             * Then it computes the set of parent folders for 'directory' that should have the same module resolution result
-             * and for every parent folder in set it adds entry: parent -> module resolution. .
-             * Lets say we first directory name: /a/b/c/d/e and resolution result is: /a/b/bar.ts.
-             * Set of parent folders that should have the same result will be:
-             * [
-             *     /a/b/c/d, /a/b/c, /a/b
-             * ]
-             * this means that request for module resolution from file in any of these folder will be immediately found in cache.
-             */
-            function set(directory, result) {
-                var path = ts.toPath(directory, currentDirectory, getCanonicalFileName);
-                // if entry is already in cache do nothing
-                if (directoryPathMap.has(path)) {
-                    return;
-                }
-                directoryPathMap.set(path, result);
-                var resolvedFileName = result.resolvedModule && result.resolvedModule.resolvedFileName;
-                // find common prefix between directory and resolved file name
-                // this common prefix should be the shorted path that has the same resolution
-                // directory: /a/b/c/d/e
-                // resolvedFileName: /a/b/foo.d.ts
-                var commonPrefix = getCommonPrefix(path, resolvedFileName);
-                var current = path;
-                while (true) {
-                    var parent = ts.getDirectoryPath(current);
-                    if (parent === current || directoryPathMap.has(parent)) {
-                        break;
-                    }
-                    directoryPathMap.set(parent, result);
-                    current = parent;
-                    if (current === commonPrefix) {
-                        break;
-                    }
-                }
-            }
-            function getCommonPrefix(directory, resolution) {
-                if (resolution === undefined) {
-                    return undefined;
-                }
-                var resolutionDirectory = ts.toPath(ts.getDirectoryPath(resolution), currentDirectory, getCanonicalFileName);
-                // find first position where directory and resolution differs
-                var i = 0;
-                while (i < Math.min(directory.length, resolutionDirectory.length) && directory.charCodeAt(i) === resolutionDirectory.charCodeAt(i)) {
-                    i++;
-                }
-                // find last directory separator before position i
-                var sep = directory.lastIndexOf(ts.directorySeparator, i);
-                if (sep < 0) {
-                    return undefined;
-                }
-                return directory.substr(0, sep);
-            }
-        }
-    }
-    ts.createModuleResolutionCacheWithMaps = createModuleResolutionCacheWithMaps;
-    function resolveModuleNameFromCache(moduleName, containingFile, cache) {
-        var containingDirectory = ts.getDirectoryPath(containingFile);
-        var perFolderCache = cache && cache.getOrCreateCacheForDirectory(containingDirectory);
-        return perFolderCache && perFolderCache.get(moduleName);
-    }
-    ts.resolveModuleNameFromCache = resolveModuleNameFromCache;
-    function resolveModuleName(moduleName, containingFile, compilerOptions, host, cache) {
-        var traceEnabled = isTraceEnabled(compilerOptions, host);
-        if (traceEnabled) {
-            trace(host, ts.Diagnostics.Resolving_module_0_from_1, moduleName, containingFile);
-        }
-        var containingDirectory = ts.getDirectoryPath(containingFile);
-        var perFolderCache = cache && cache.getOrCreateCacheForDirectory(containingDirectory);
-        var result = perFolderCache && perFolderCache.get(moduleName);
-        if (result) {
-            if (traceEnabled) {
-                trace(host, ts.Diagnostics.Resolution_for_module_0_was_found_in_cache_from_location_1, moduleName, containingDirectory);
-            }
-        }
-        else {
-            var moduleResolution = compilerOptions.moduleResolution;
-            if (moduleResolution === undefined) {
-                moduleResolution = ts.getEmitModuleKind(compilerOptions) === ts.ModuleKind.CommonJS ? ts.ModuleResolutionKind.NodeJs : ts.ModuleResolutionKind.Classic;
-                if (traceEnabled) {
-                    trace(host, ts.Diagnostics.Module_resolution_kind_is_not_specified_using_0, ts.ModuleResolutionKind[moduleResolution]);
-                }
-            }
-            else {
-                if (traceEnabled) {
-                    trace(host, ts.Diagnostics.Explicitly_specified_module_resolution_kind_Colon_0, ts.ModuleResolutionKind[moduleResolution]);
-                }
-            }
-            switch (moduleResolution) {
-                case ts.ModuleResolutionKind.NodeJs:
-                    result = nodeModuleNameResolver(moduleName, containingFile, compilerOptions, host, cache);
-                    break;
-                case ts.ModuleResolutionKind.Classic:
-                    result = classicNameResolver(moduleName, containingFile, compilerOptions, host, cache);
-                    break;
-                default:
-                    return ts.Debug.fail("Unexpected moduleResolution: " + moduleResolution);
-            }
-            if (perFolderCache) {
-                perFolderCache.set(moduleName, result);
-                // put result in per-module name cache
-                var perModuleNameCache = cache.getOrCreateCacheForModuleName(moduleName);
-                if (perModuleNameCache) {
-                    perModuleNameCache.set(containingDirectory, result);
-                }
-            }
-        }
-        if (traceEnabled) {
-            if (result.resolvedModule) {
-                trace(host, ts.Diagnostics.Module_name_0_was_successfully_resolved_to_1, moduleName, result.resolvedModule.resolvedFileName);
-            }
-            else {
-                trace(host, ts.Diagnostics.Module_name_0_was_not_resolved, moduleName);
-            }
-        }
-        return result;
-    }
-    ts.resolveModuleName = resolveModuleName;
-    /**
-     * Any module resolution kind can be augmented with optional settings: 'baseUrl', 'paths' and 'rootDirs' - they are used to
-     * mitigate differences between design time structure of the project and its runtime counterpart so the same import name
-     * can be resolved successfully by TypeScript compiler and runtime module loader.
-     * If these settings are set then loading procedure will try to use them to resolve module name and it can of failure it will
-     * fallback to standard resolution routine.
-     *
-     * - baseUrl - this setting controls how non-relative module names are resolved. If this setting is specified then non-relative
-     * names will be resolved relative to baseUrl: i.e. if baseUrl is '/a/b' then candidate location to resolve module name 'c/d' will
-     * be '/a/b/c/d'
-     * - paths - this setting can only be used when baseUrl is specified. allows to tune how non-relative module names
-     * will be resolved based on the content of the module name.
-     * Structure of 'paths' compiler options
-     * 'paths': {
-     *    pattern-1: [...substitutions],
-     *    pattern-2: [...substitutions],
-     *    ...
-     *    pattern-n: [...substitutions]
-     * }
-     * Pattern here is a string that can contain zero or one '*' character. During module resolution module name will be matched against
-     * all patterns in the list. Matching for patterns that don't contain '*' means that module name must be equal to pattern respecting the case.
-     * If pattern contains '*' then to match pattern "<prefix>*<suffix>" module name must start with the <prefix> and end with <suffix>.
-     * <MatchedStar> denotes part of the module name between <prefix> and <suffix>.
-     * If module name can be matches with multiple patterns then pattern with the longest prefix will be picked.
-     * After selecting pattern we'll use list of substitutions to get candidate locations of the module and the try to load module
-     * from the candidate location.
-     * Substitution is a string that can contain zero or one '*'. To get candidate location from substitution we'll pick every
-     * substitution in the list and replace '*' with <MatchedStar> string. If candidate location is not rooted it
-     * will be converted to absolute using baseUrl.
-     * For example:
-     * baseUrl: /a/b/c
-     * "paths": {
-     *     // match all module names
-     *     "*": [
-     *         "*",        // use matched name as is,
-     *                     // <matched name> will be looked as /a/b/c/<matched name>
-     *
-     *         "folder1/*" // substitution will convert matched name to 'folder1/<matched name>',
-     *                     // since it is not rooted then final candidate location will be /a/b/c/folder1/<matched name>
-     *     ],
-     *     // match module names that start with 'components/'
-     *     "components/*": [ "/root/components/*" ] // substitution will convert /components/folder1/<matched name> to '/root/components/folder1/<matched name>',
-     *                                              // it is rooted so it will be final candidate location
-     * }
-     *
-     * 'rootDirs' allows the project to be spreaded across multiple locations and resolve modules with relative names as if
-     * they were in the same location. For example lets say there are two files
-     * '/local/src/content/file1.ts'
-     * '/shared/components/contracts/src/content/protocols/file2.ts'
-     * After bundling content of '/shared/components/contracts/src' will be merged with '/local/src' so
-     * if file1 has the following import 'import {x} from "./protocols/file2"' it will be resolved successfully in runtime.
-     * 'rootDirs' provides the way to tell compiler that in order to get the whole project it should behave as if content of all
-     * root dirs were merged together.
-     * I.e. for the example above 'rootDirs' will have two entries: [ '/local/src', '/shared/components/contracts/src' ].
-     * Compiler will first convert './protocols/file2' into absolute path relative to the location of containing file:
-     * '/local/src/content/protocols/file2' and try to load it - failure.
-     * Then it will search 'rootDirs' looking for a longest matching prefix of this absolute path and if such prefix is found - absolute path will
-     * be converted to a path relative to found rootDir entry './content/protocols/file2' (*). As a last step compiler will check all remaining
-     * entries in 'rootDirs', use them to build absolute path out of (*) and try to resolve module from this location.
-     */
-    function tryLoadModuleUsingOptionalResolutionSettings(extensions, moduleName, containingDirectory, loader, failedLookupLocations, state) {
-        if (!ts.isExternalModuleNameRelative(moduleName)) {
-            return tryLoadModuleUsingBaseUrl(extensions, moduleName, loader, failedLookupLocations, state);
-        }
-        else {
-            return tryLoadModuleUsingRootDirs(extensions, moduleName, containingDirectory, loader, failedLookupLocations, state);
-        }
-    }
-    function tryLoadModuleUsingRootDirs(extensions, moduleName, containingDirectory, loader, failedLookupLocations, state) {
-        if (!state.compilerOptions.rootDirs) {
-            return undefined;
-        }
-        if (state.traceEnabled) {
-            trace(state.host, ts.Diagnostics.rootDirs_option_is_set_using_it_to_resolve_relative_module_name_0, moduleName);
-        }
-        var candidate = ts.normalizePath(ts.combinePaths(containingDirectory, moduleName));
-        var matchedRootDir;
-        var matchedNormalizedPrefix;
-        for (var _i = 0, _a = state.compilerOptions.rootDirs; _i < _a.length; _i++) {
-            var rootDir = _a[_i];
-            // rootDirs are expected to be absolute
-            // in case of tsconfig.json this will happen automatically - compiler will expand relative names
-            // using location of tsconfig.json as base location
-            var normalizedRoot = ts.normalizePath(rootDir);
-            if (!ts.endsWith(normalizedRoot, ts.directorySeparator)) {
-                normalizedRoot += ts.directorySeparator;
-            }
-            var isLongestMatchingPrefix = ts.startsWith(candidate, normalizedRoot) &&
-                (matchedNormalizedPrefix === undefined || matchedNormalizedPrefix.length < normalizedRoot.length);
-            if (state.traceEnabled) {
-                trace(state.host, ts.Diagnostics.Checking_if_0_is_the_longest_matching_prefix_for_1_2, normalizedRoot, candidate, isLongestMatchingPrefix);
-            }
-            if (isLongestMatchingPrefix) {
-                matchedNormalizedPrefix = normalizedRoot;
-                matchedRootDir = rootDir;
-            }
-        }
-        if (matchedNormalizedPrefix) {
-            if (state.traceEnabled) {
-                trace(state.host, ts.Diagnostics.Longest_matching_prefix_for_0_is_1, candidate, matchedNormalizedPrefix);
-            }
-            var suffix = candidate.substr(matchedNormalizedPrefix.length);
-            // first - try to load from a initial location
-            if (state.traceEnabled) {
-                trace(state.host, ts.Diagnostics.Loading_0_from_the_root_dir_1_candidate_location_2, suffix, matchedNormalizedPrefix, candidate);
-            }
-            var resolvedFileName = loader(extensions, candidate, failedLookupLocations, !directoryProbablyExists(containingDirectory, state.host), state);
-            if (resolvedFileName) {
-                return resolvedFileName;
-            }
-            if (state.traceEnabled) {
-                trace(state.host, ts.Diagnostics.Trying_other_entries_in_rootDirs);
-            }
-            // then try to resolve using remaining entries in rootDirs
-            for (var _b = 0, _c = state.compilerOptions.rootDirs; _b < _c.length; _b++) {
-                var rootDir = _c[_b];
-                if (rootDir === matchedRootDir) {
-                    // skip the initially matched entry
-                    continue;
-                }
-                var candidate_1 = ts.combinePaths(ts.normalizePath(rootDir), suffix);
-                if (state.traceEnabled) {
-                    trace(state.host, ts.Diagnostics.Loading_0_from_the_root_dir_1_candidate_location_2, suffix, rootDir, candidate_1);
-                }
-                var baseDirectory = ts.getDirectoryPath(candidate_1);
-                var resolvedFileName_1 = loader(extensions, candidate_1, failedLookupLocations, !directoryProbablyExists(baseDirectory, state.host), state);
-                if (resolvedFileName_1) {
-                    return resolvedFileName_1;
-                }
-            }
-            if (state.traceEnabled) {
-                trace(state.host, ts.Diagnostics.Module_resolution_using_rootDirs_has_failed);
-            }
-        }
-        return undefined;
-    }
-    function tryLoadModuleUsingBaseUrl(extensions, moduleName, loader, failedLookupLocations, state) {
-        if (!state.compilerOptions.baseUrl) {
-            return undefined;
-        }
-        if (state.traceEnabled) {
-            trace(state.host, ts.Diagnostics.baseUrl_option_is_set_to_0_using_this_value_to_resolve_non_relative_module_name_1, state.compilerOptions.baseUrl, moduleName);
-        }
-        // string is for exact match
-        var matchedPattern;
-        if (state.compilerOptions.paths) {
-            if (state.traceEnabled) {
-                trace(state.host, ts.Diagnostics.paths_option_is_specified_looking_for_a_pattern_to_match_module_name_0, moduleName);
-            }
-            matchedPattern = ts.matchPatternOrExact(ts.getOwnKeys(state.compilerOptions.paths), moduleName);
-        }
-        if (matchedPattern) {
-            var matchedStar_1 = ts.isString(matchedPattern) ? undefined : ts.matchedText(matchedPattern, moduleName);
-            var matchedPatternText = ts.isString(matchedPattern) ? matchedPattern : ts.patternText(matchedPattern);
-            if (state.traceEnabled) {
-                trace(state.host, ts.Diagnostics.Module_name_0_matched_pattern_1, moduleName, matchedPatternText);
-            }
-            return ts.forEach(state.compilerOptions.paths[matchedPatternText], function (subst) {
-                var path = matchedStar_1 ? subst.replace("*", matchedStar_1) : subst;
-                var candidate = ts.normalizePath(ts.combinePaths(state.compilerOptions.baseUrl, path));
-                if (state.traceEnabled) {
-                    trace(state.host, ts.Diagnostics.Trying_substitution_0_candidate_module_location_Colon_1, subst, path);
-                }
-                // A path mapping may have an extension, in contrast to an import, which should omit it.
-                var extension = ts.tryGetExtensionFromPath(candidate);
-                if (extension !== undefined) {
-                    var path_1 = tryFile(candidate, failedLookupLocations, /*onlyRecordFailures*/ false, state);
-                    if (path_1 !== undefined) {
-                        return noPackageId({ path: path_1, ext: extension });
-                    }
-                }
-                return loader(extensions, candidate, failedLookupLocations, !directoryProbablyExists(ts.getDirectoryPath(candidate), state.host), state);
-            });
-        }
-        else {
-            var candidate = ts.normalizePath(ts.combinePaths(state.compilerOptions.baseUrl, moduleName));
-            if (state.traceEnabled) {
-                trace(state.host, ts.Diagnostics.Resolving_module_name_0_relative_to_base_url_1_2, moduleName, state.compilerOptions.baseUrl, candidate);
-            }
-            return loader(extensions, candidate, failedLookupLocations, !directoryProbablyExists(ts.getDirectoryPath(candidate), state.host), state);
-        }
-    }
-    function nodeModuleNameResolver(moduleName, containingFile, compilerOptions, host, cache) {
-        return nodeModuleNameResolverWorker(moduleName, ts.getDirectoryPath(containingFile), compilerOptions, host, cache, /*jsOnly*/ false);
-    }
-    ts.nodeModuleNameResolver = nodeModuleNameResolver;
-    /**
-     * Expose resolution logic to allow us to use Node module resolution logic from arbitrary locations.
-     * No way to do this with `require()`: https://github.com/nodejs/node/issues/5963
-     * Throws an error if the module can't be resolved.
-     */
-    /* @internal */
-    function resolveJavaScriptModule(moduleName, initialDir, host) {
-        var _a = nodeModuleNameResolverWorker(moduleName, initialDir, { moduleResolution: ts.ModuleResolutionKind.NodeJs, allowJs: true }, host, /*cache*/ undefined, /*jsOnly*/ true), resolvedModule = _a.resolvedModule, failedLookupLocations = _a.failedLookupLocations;
-        if (!resolvedModule) {
-            throw new Error("Could not resolve JS module '" + moduleName + "' starting at '" + initialDir + "'. Looked in: " + failedLookupLocations.join(", "));
-        }
-        return resolvedModule.resolvedFileName;
-    }
-    ts.resolveJavaScriptModule = resolveJavaScriptModule;
-    function nodeModuleNameResolverWorker(moduleName, containingDirectory, compilerOptions, host, cache, jsOnly) {
-        var traceEnabled = isTraceEnabled(compilerOptions, host);
-        var failedLookupLocations = [];
-        var state = { compilerOptions: compilerOptions, host: host, traceEnabled: traceEnabled };
-        var result = jsOnly ?
-            tryResolve(Extensions.JavaScript) :
-            (tryResolve(Extensions.TypeScript) ||
-                tryResolve(Extensions.JavaScript) ||
-                (compilerOptions.resolveJsonModule ? tryResolve(Extensions.Json) : undefined));
-        if (result && result.value) {
-            var _a = result.value, resolved = _a.resolved, originalPath = _a.originalPath, isExternalLibraryImport = _a.isExternalLibraryImport;
-            return createResolvedModuleWithFailedLookupLocations(resolved, originalPath, isExternalLibraryImport, failedLookupLocations);
-        }
-        return { resolvedModule: undefined, failedLookupLocations: failedLookupLocations };
-        function tryResolve(extensions) {
-            var loader = function (extensions, candidate, failedLookupLocations, onlyRecordFailures, state) { return nodeLoadModuleByRelativeName(extensions, candidate, failedLookupLocations, onlyRecordFailures, state, /*considerPackageJson*/ true); };
-            var resolved = tryLoadModuleUsingOptionalResolutionSettings(extensions, moduleName, containingDirectory, loader, failedLookupLocations, state);
-            if (resolved) {
-                return toSearchResult({ resolved: resolved, isExternalLibraryImport: false });
-            }
-            if (!ts.isExternalModuleNameRelative(moduleName)) {
-                if (traceEnabled) {
-                    trace(host, ts.Diagnostics.Loading_module_0_from_node_modules_folder_target_file_type_1, moduleName, Extensions[extensions]);
-                }
-                var resolved_1 = loadModuleFromNodeModules(extensions, moduleName, containingDirectory, failedLookupLocations, state, cache);
-                if (!resolved_1)
-                    return undefined;
-                var resolvedValue = resolved_1.value;
-                var originalPath = void 0;
-                if (!compilerOptions.preserveSymlinks && resolvedValue) {
-                    originalPath = resolvedValue.path;
-                    var path = realPath(resolvedValue.path, host, traceEnabled);
-                    if (path === originalPath) {
-                        originalPath = undefined;
-                    }
-                    resolvedValue = __assign({}, resolvedValue, { path: path });
-                }
-                // For node_modules lookups, get the real path so that multiple accesses to an `npm link`-ed module do not create duplicate files.
-                return { value: resolvedValue && { resolved: resolvedValue, originalPath: originalPath, isExternalLibraryImport: true } };
-            }
-            else {
-                var _a = ts.normalizePathAndParts(ts.combinePaths(containingDirectory, moduleName)), candidate = _a.path, parts = _a.parts;
-                var resolved_2 = nodeLoadModuleByRelativeName(extensions, candidate, failedLookupLocations, /*onlyRecordFailures*/ false, state, /*considerPackageJson*/ true);
-                // Treat explicit "node_modules" import as an external library import.
-                return resolved_2 && toSearchResult({ resolved: resolved_2, isExternalLibraryImport: ts.contains(parts, "node_modules") });
-            }
-        }
-    }
-    function realPath(path, host, traceEnabled) {
-        if (!host.realpath) {
-            return path;
-        }
-        var real = ts.normalizePath(host.realpath(path));
-        if (traceEnabled) {
-            trace(host, ts.Diagnostics.Resolving_real_path_for_0_result_1, path, real);
-        }
-        ts.Debug.assert(host.fileExists(real), path + " linked to nonexistent file " + real); // tslint:disable-line
-        return real;
-    }
-    function nodeLoadModuleByRelativeName(extensions, candidate, failedLookupLocations, onlyRecordFailures, state, considerPackageJson) {
-        if (state.traceEnabled) {
-            trace(state.host, ts.Diagnostics.Loading_module_as_file_Slash_folder_candidate_module_location_0_target_file_type_1, candidate, Extensions[extensions]);
-        }
-        if (!ts.hasTrailingDirectorySeparator(candidate)) {
-            if (!onlyRecordFailures) {
-                var parentOfCandidate = ts.getDirectoryPath(candidate);
-                if (!directoryProbablyExists(parentOfCandidate, state.host)) {
-                    if (state.traceEnabled) {
-                        trace(state.host, ts.Diagnostics.Directory_0_does_not_exist_skipping_all_lookups_in_it, parentOfCandidate);
-                    }
-                    onlyRecordFailures = true;
-                }
-            }
-            var resolvedFromFile = loadModuleFromFile(extensions, candidate, failedLookupLocations, onlyRecordFailures, state);
-            if (resolvedFromFile) {
-                var nm = considerPackageJson ? parseNodeModuleFromPath(resolvedFromFile) : undefined;
-                var packageId = nm && getPackageJsonInfo(nm.packageDirectory, nm.subModuleName, failedLookupLocations, /*onlyRecordFailures*/ false, state).packageId;
-                return withPackageId(packageId, resolvedFromFile);
-            }
-        }
-        if (!onlyRecordFailures) {
-            var candidateExists = directoryProbablyExists(candidate, state.host);
-            if (!candidateExists) {
-                if (state.traceEnabled) {
-                    trace(state.host, ts.Diagnostics.Directory_0_does_not_exist_skipping_all_lookups_in_it, candidate);
-                }
-                onlyRecordFailures = true;
-            }
-        }
-        return loadNodeModuleFromDirectory(extensions, candidate, failedLookupLocations, onlyRecordFailures, state, considerPackageJson);
-    }
-    var nodeModulesPathPart = "/node_modules/";
-    /**
-     * This will be called on the successfully resolved path from `loadModuleFromFile`.
-     * (Not neeeded for `loadModuleFromNodeModules` as that looks up the `package.json` as part of resolution.)
-     *
-     * packageDirectory is the directory of the package itself.
-     * subModuleName is the path within the package.
-     *   For `blah/node_modules/foo/index.d.ts` this is { packageDirectory: "foo", subModuleName: "index.d.ts" }. (Part before "/node_modules/" is ignored.)
-     *   For `/node_modules/foo/bar.d.ts` this is { packageDirectory: "foo", subModuleName": "bar/index.d.ts" }.
-     *   For `/node_modules/@types/foo/bar/index.d.ts` this is { packageDirectory: "@types/foo", subModuleName: "bar/index.d.ts" }.
-     *   For `/node_modules/foo/bar/index.d.ts` this is { packageDirectory: "foo", subModuleName": "bar/index.d.ts" }.
-     */
-    function parseNodeModuleFromPath(resolved) {
-        var path = ts.normalizePath(resolved.path);
-        var idx = path.lastIndexOf(nodeModulesPathPart);
-        if (idx === -1) {
-            return undefined;
-        }
-        var indexAfterNodeModules = idx + nodeModulesPathPart.length;
-        var indexAfterPackageName = moveToNextDirectorySeparatorIfAvailable(path, indexAfterNodeModules);
-        if (path.charCodeAt(indexAfterNodeModules) === 64 /* at */) {
-            indexAfterPackageName = moveToNextDirectorySeparatorIfAvailable(path, indexAfterPackageName);
-        }
-        var packageDirectory = path.slice(0, indexAfterPackageName);
-        var subModuleName = ts.removeExtension(path.slice(indexAfterPackageName + 1), resolved.ext) + ".d.ts" /* Dts */;
-        return { packageDirectory: packageDirectory, subModuleName: subModuleName };
-    }
-    function moveToNextDirectorySeparatorIfAvailable(path, prevSeparatorIndex) {
-        var nextSeparatorIndex = path.indexOf(ts.directorySeparator, prevSeparatorIndex + 1);
-        return nextSeparatorIndex === -1 ? prevSeparatorIndex : nextSeparatorIndex;
-    }
-    function addExtensionAndIndex(path) {
-        if (path === "") {
-            return "index.d.ts";
-        }
-        if (ts.endsWith(path, ".d.ts")) {
-            return path;
-        }
-        if (ts.endsWith(path, "/index")) {
-            return path + ".d.ts";
-        }
-        return path + "/index.d.ts";
-    }
-    /* @internal */
-    function directoryProbablyExists(directoryName, host) {
-        // if host does not support 'directoryExists' assume that directory will exist
-        return !host.directoryExists || host.directoryExists(directoryName);
-    }
-    ts.directoryProbablyExists = directoryProbablyExists;
-    function loadModuleFromFileNoPackageId(extensions, candidate, failedLookupLocations, onlyRecordFailures, state) {
-        return noPackageId(loadModuleFromFile(extensions, candidate, failedLookupLocations, onlyRecordFailures, state));
-    }
-    /**
-     * @param {boolean} onlyRecordFailures - if true then function won't try to actually load files but instead record all attempts as failures. This flag is necessary
-     * in cases when we know upfront that all load attempts will fail (because containing folder does not exists) however we still need to record all failed lookup locations.
-     */
-    function loadModuleFromFile(extensions, candidate, failedLookupLocations, onlyRecordFailures, state) {
-        if (extensions === Extensions.Json) {
-            var extensionLess = ts.tryRemoveExtension(candidate, ".json" /* Json */);
-            return extensionLess === undefined ? undefined : tryAddingExtensions(extensionLess, extensions, failedLookupLocations, onlyRecordFailures, state);
-        }
-        // First, try adding an extension. An import of "foo" could be matched by a file "foo.ts", or "foo.js" by "foo.js.ts"
-        var resolvedByAddingExtension = tryAddingExtensions(candidate, extensions, failedLookupLocations, onlyRecordFailures, state);
-        if (resolvedByAddingExtension) {
-            return resolvedByAddingExtension;
-        }
-        // If that didn't work, try stripping a ".js" or ".jsx" extension and replacing it with a TypeScript one;
-        // e.g. "./foo.js" can be matched by "./foo.ts" or "./foo.d.ts"
-        if (ts.hasJavaScriptFileExtension(candidate)) {
-            var extensionless = ts.removeFileExtension(candidate);
-            if (state.traceEnabled) {
-                var extension = candidate.substring(extensionless.length);
-                trace(state.host, ts.Diagnostics.File_name_0_has_a_1_extension_stripping_it, candidate, extension);
-            }
-            return tryAddingExtensions(extensionless, extensions, failedLookupLocations, onlyRecordFailures, state);
-        }
-    }
-    /** Try to return an existing file that adds one of the `extensions` to `candidate`. */
-    function tryAddingExtensions(candidate, extensions, failedLookupLocations, onlyRecordFailures, state) {
-        if (!onlyRecordFailures) {
-            // check if containing folder exists - if it doesn't then just record failures for all supported extensions without disk probing
-            var directory_1 = ts.getDirectoryPath(candidate);
-            if (directory_1) {
-                onlyRecordFailures = !directoryProbablyExists(directory_1, state.host);
-            }
-        }
-        switch (extensions) {
-            case Extensions.DtsOnly:
-                return tryExtension(".d.ts" /* Dts */);
-            case Extensions.TypeScript:
-                return tryExtension(".ts" /* Ts */) || tryExtension(".tsx" /* Tsx */) || tryExtension(".d.ts" /* Dts */);
-            case Extensions.JavaScript:
-                return tryExtension(".js" /* Js */) || tryExtension(".jsx" /* Jsx */);
-            case Extensions.Json:
-                return tryExtension(".json" /* Json */);
-        }
-        function tryExtension(ext) {
-            var path = tryFile(candidate + ext, failedLookupLocations, onlyRecordFailures, state);
-            return path === undefined ? undefined : { path: path, ext: ext };
-        }
-    }
-    /** Return the file if it exists. */
-    function tryFile(fileName, failedLookupLocations, onlyRecordFailures, state) {
-        if (!onlyRecordFailures) {
-            if (state.host.fileExists(fileName)) {
-                if (state.traceEnabled) {
-                    trace(state.host, ts.Diagnostics.File_0_exist_use_it_as_a_name_resolution_result, fileName);
-                }
-                return fileName;
-            }
-            else {
-                if (state.traceEnabled) {
-                    trace(state.host, ts.Diagnostics.File_0_does_not_exist, fileName);
-                }
-            }
-        }
-        failedLookupLocations.push(fileName);
-        return undefined;
-    }
-    function loadNodeModuleFromDirectory(extensions, candidate, failedLookupLocations, onlyRecordFailures, state, considerPackageJson) {
-        if (considerPackageJson === void 0) { considerPackageJson = true; }
-        var _a = considerPackageJson
-            ? getPackageJsonInfo(candidate, "", failedLookupLocations, onlyRecordFailures, state)
-            : { packageJsonContent: undefined, packageId: undefined }, packageJsonContent = _a.packageJsonContent, packageId = _a.packageId;
-        return withPackageId(packageId, loadNodeModuleFromDirectoryWorker(extensions, candidate, failedLookupLocations, onlyRecordFailures, state, packageJsonContent));
-    }
-    function loadNodeModuleFromDirectoryWorker(extensions, candidate, failedLookupLocations, onlyRecordFailures, state, packageJsonContent) {
-        var fromPackageJson = packageJsonContent && loadModuleFromPackageJson(packageJsonContent, extensions, candidate, failedLookupLocations, state);
-        if (fromPackageJson) {
-            return fromPackageJson;
-        }
-        var directoryExists = !onlyRecordFailures && directoryProbablyExists(candidate, state.host);
-        return loadModuleFromFile(extensions, ts.combinePaths(candidate, "index"), failedLookupLocations, !directoryExists, state);
-    }
-    function getPackageJsonInfo(nodeModuleDirectory, subModuleName, failedLookupLocations, onlyRecordFailures, state) {
-        var host = state.host, traceEnabled = state.traceEnabled;
-        var directoryExists = !onlyRecordFailures && directoryProbablyExists(nodeModuleDirectory, host);
-        var packageJsonPath = pathToPackageJson(nodeModuleDirectory);
-        if (directoryExists && host.fileExists(packageJsonPath)) {
-            var packageJsonContent = readJson(packageJsonPath, host);
-            if (subModuleName === "") { // looking up the root - need to handle types/typings/main redirects for subModuleName
-                var path = tryReadPackageJsonFields(/*readTypes*/ true, packageJsonContent, nodeModuleDirectory, state);
-                if (typeof path === "string") {
-                    subModuleName = addExtensionAndIndex(path.substring(nodeModuleDirectory.length + 1));
-                }
-                else {
-                    var jsPath = tryReadPackageJsonFields(/*readTypes*/ false, packageJsonContent, nodeModuleDirectory, state);
-                    if (typeof jsPath === "string" && jsPath.length > nodeModuleDirectory.length) {
-                        var potentialSubModule_1 = jsPath.substring(nodeModuleDirectory.length + 1);
-                        subModuleName = (ts.forEach(ts.supportedJavascriptExtensions, function (extension) {
-                            return ts.tryRemoveExtension(potentialSubModule_1, extension);
-                        }) || potentialSubModule_1) + ".d.ts" /* Dts */;
-                    }
-                    else {
-                        subModuleName = "index.d.ts";
-                    }
-                }
-            }
-            if (!ts.endsWith(subModuleName, ".d.ts" /* Dts */)) {
-                subModuleName = addExtensionAndIndex(subModuleName);
-            }
-            var packageId = typeof packageJsonContent.name === "string" && typeof packageJsonContent.version === "string"
-                ? { name: packageJsonContent.name, subModuleName: subModuleName, version: packageJsonContent.version }
-                : undefined;
-            if (traceEnabled) {
-                if (packageId) {
-                    trace(host, ts.Diagnostics.Found_package_json_at_0_Package_ID_is_1, packageJsonPath, ts.packageIdToString(packageId));
-                }
-                else {
-                    trace(host, ts.Diagnostics.Found_package_json_at_0, packageJsonPath);
-                }
-            }
-            return { found: true, packageJsonContent: packageJsonContent, packageId: packageId };
-        }
-        else {
-            if (directoryExists && traceEnabled) {
-                trace(host, ts.Diagnostics.File_0_does_not_exist, packageJsonPath);
-            }
-            // record package json as one of failed lookup locations - in the future if this file will appear it will invalidate resolution results
-            failedLookupLocations.push(packageJsonPath);
-            return { found: false, packageJsonContent: undefined, packageId: undefined };
-        }
-    }
-    function loadModuleFromPackageJson(jsonContent, extensions, candidate, failedLookupLocations, state) {
-        var file = tryReadPackageJsonFields(extensions !== Extensions.JavaScript && extensions !== Extensions.Json, jsonContent, candidate, state);
-        if (!file) {
-            if (extensions === Extensions.TypeScript) {
-                // When resolving typescript modules, try resolving using main field as well
-                file = tryReadPackageJsonFields(/*readTypes*/ false, jsonContent, candidate, state);
-                if (!file) {
-                    return undefined;
-                }
-            }
-            else {
-                return undefined;
-            }
-        }
-        var onlyRecordFailures = !directoryProbablyExists(ts.getDirectoryPath(file), state.host);
-        var fromFile = tryFile(file, failedLookupLocations, onlyRecordFailures, state);
-        if (fromFile) {
-            var resolved = resolvedIfExtensionMatches(extensions, fromFile);
-            if (resolved) {
-                return resolved;
-            }
-            if (state.traceEnabled) {
-                trace(state.host, ts.Diagnostics.File_0_has_an_unsupported_extension_so_skipping_it, fromFile);
-            }
-        }
-        // Even if extensions is DtsOnly, we can still look up a .ts file as a result of package.json "types"
-        var nextExtensions = extensions === Extensions.DtsOnly ? Extensions.TypeScript : extensions;
-        // Don't do package.json lookup recursively, because Node.js' package lookup doesn't.
-        var result = nodeLoadModuleByRelativeName(nextExtensions, file, failedLookupLocations, onlyRecordFailures, state, /*considerPackageJson*/ false);
-        if (result) {
-            // It won't have a `packageId` set, because we disabled `considerPackageJson`.
-            ts.Debug.assert(result.packageId === undefined);
-            return { path: result.path, ext: result.extension };
-        }
-    }
-    /** Resolve from an arbitrarily specified file. Return `undefined` if it has an unsupported extension. */
-    function resolvedIfExtensionMatches(extensions, path) {
-        var ext = ts.tryGetExtensionFromPath(path);
-        return ext !== undefined && extensionIsOk(extensions, ext) ? { path: path, ext: ext } : undefined;
-    }
-    /** True if `extension` is one of the supported `extensions`. */
-    function extensionIsOk(extensions, extension) {
-        switch (extensions) {
-            case Extensions.JavaScript:
-                return extension === ".js" /* Js */ || extension === ".jsx" /* Jsx */;
-            case Extensions.Json:
-                return extension === ".json" /* Json */;
-            case Extensions.TypeScript:
-                return extension === ".ts" /* Ts */ || extension === ".tsx" /* Tsx */ || extension === ".d.ts" /* Dts */;
-            case Extensions.DtsOnly:
-                return extension === ".d.ts" /* Dts */;
-        }
-    }
-    function pathToPackageJson(directory) {
-        return ts.combinePaths(directory, "package.json");
-    }
-    function loadModuleFromNodeModulesFolder(extensions, moduleName, nodeModulesFolder, nodeModulesFolderExists, failedLookupLocations, state) {
-        var candidate = ts.normalizePath(ts.combinePaths(nodeModulesFolder, moduleName));
-        // First look for a nested package.json, as in `node_modules/foo/bar/package.json`.
-        var packageJsonContent;
-        var packageId;
-        var packageInfo = getPackageJsonInfo(candidate, "", failedLookupLocations, /*onlyRecordFailures*/ !nodeModulesFolderExists, state);
-        if (packageInfo.found) {
-            (packageJsonContent = packageInfo.packageJsonContent, packageId = packageInfo.packageId);
-        }
-        else {
-            var _a = getPackageName(moduleName), packageName = _a.packageName, rest = _a.rest;
-            if (rest !== "") { // If "rest" is empty, we just did this search above.
-                var packageRootPath = ts.combinePaths(nodeModulesFolder, packageName);
-                // Don't use a "types" or "main" from here because we're not loading the root, but a subdirectory -- just here for the packageId.
-                packageId = getPackageJsonInfo(packageRootPath, rest, failedLookupLocations, !nodeModulesFolderExists, state).packageId;
-            }
-        }
-        var pathAndExtension = loadModuleFromFile(extensions, candidate, failedLookupLocations, !nodeModulesFolderExists, state) ||
-            loadNodeModuleFromDirectoryWorker(extensions, candidate, failedLookupLocations, !nodeModulesFolderExists, state, packageJsonContent);
-        return withPackageId(packageId, pathAndExtension);
-    }
-    /* @internal */
-    function getPackageName(moduleName) {
-        var idx = moduleName.indexOf(ts.directorySeparator);
-        if (moduleName[0] === "@") {
-            idx = moduleName.indexOf(ts.directorySeparator, idx + 1);
-        }
-        return idx === -1 ? { packageName: moduleName, rest: "" } : { packageName: moduleName.slice(0, idx), rest: moduleName.slice(idx + 1) };
-    }
-    ts.getPackageName = getPackageName;
-    function loadModuleFromNodeModules(extensions, moduleName, directory, failedLookupLocations, state, cache) {
-        return loadModuleFromNodeModulesWorker(extensions, moduleName, directory, failedLookupLocations, state, /*typesOnly*/ false, cache);
-    }
-    function loadModuleFromNodeModulesAtTypes(moduleName, directory, failedLookupLocations, state) {
-        // Extensions parameter here doesn't actually matter, because typesOnly ensures we're just doing @types lookup, which is always DtsOnly.
-        return loadModuleFromNodeModulesWorker(Extensions.DtsOnly, moduleName, directory, failedLookupLocations, state, /*typesOnly*/ true, /*cache*/ undefined);
-    }
-    function loadModuleFromNodeModulesWorker(extensions, moduleName, directory, failedLookupLocations, state, typesOnly, cache) {
-        var perModuleNameCache = cache && cache.getOrCreateCacheForModuleName(moduleName);
-        return ts.forEachAncestorDirectory(ts.normalizeSlashes(directory), function (ancestorDirectory) {
-            if (ts.getBaseFileName(ancestorDirectory) !== "node_modules") {
-                var resolutionFromCache = tryFindNonRelativeModuleNameInCache(perModuleNameCache, moduleName, ancestorDirectory, state.traceEnabled, state.host, failedLookupLocations);
-                if (resolutionFromCache) {
-                    return resolutionFromCache;
-                }
-                return toSearchResult(loadModuleFromNodeModulesOneLevel(extensions, moduleName, ancestorDirectory, failedLookupLocations, state, typesOnly));
-            }
-        });
-    }
-    /** Load a module from a single node_modules directory, but not from any ancestors' node_modules directories. */
-    function loadModuleFromNodeModulesOneLevel(extensions, moduleName, directory, failedLookupLocations, state, typesOnly) {
-        if (typesOnly === void 0) { typesOnly = false; }
-        var nodeModulesFolder = ts.combinePaths(directory, "node_modules");
-        var nodeModulesFolderExists = directoryProbablyExists(nodeModulesFolder, state.host);
-        if (!nodeModulesFolderExists && state.traceEnabled) {
-            trace(state.host, ts.Diagnostics.Directory_0_does_not_exist_skipping_all_lookups_in_it, nodeModulesFolder);
-        }
-        var packageResult = typesOnly ? undefined : loadModuleFromNodeModulesFolder(extensions, moduleName, nodeModulesFolder, nodeModulesFolderExists, failedLookupLocations, state);
-        if (packageResult) {
-            return packageResult;
-        }
-        if (extensions !== Extensions.JavaScript && extensions !== Extensions.Json) {
-            var nodeModulesAtTypes_1 = ts.combinePaths(nodeModulesFolder, "@types");
-            var nodeModulesAtTypesExists = nodeModulesFolderExists;
-            if (nodeModulesFolderExists && !directoryProbablyExists(nodeModulesAtTypes_1, state.host)) {
-                if (state.traceEnabled) {
-                    trace(state.host, ts.Diagnostics.Directory_0_does_not_exist_skipping_all_lookups_in_it, nodeModulesAtTypes_1);
-                }
-                nodeModulesAtTypesExists = false;
-            }
-            return loadModuleFromNodeModulesFolder(Extensions.DtsOnly, mangleScopedPackage(moduleName, state), nodeModulesAtTypes_1, nodeModulesAtTypesExists, failedLookupLocations, state);
-        }
-    }
-    /** Double underscores are used in DefinitelyTyped to delimit scoped packages. */
-    var mangledScopedPackageSeparator = "__";
-    /** For a scoped package, we must look in `@types/foo__bar` instead of `@types/@foo/bar`. */
-    function mangleScopedPackage(packageName, state) {
-        var mangled = getMangledNameForScopedPackage(packageName);
-        if (state.traceEnabled && mangled !== packageName) {
-            trace(state.host, ts.Diagnostics.Scoped_package_detected_looking_in_0, mangled);
-        }
-        return mangled;
-    }
-    /* @internal */
-    function getTypesPackageName(packageName) {
-        return "@types/" + getMangledNameForScopedPackage(packageName);
-    }
-    ts.getTypesPackageName = getTypesPackageName;
-    /* @internal */
-    function getMangledNameForScopedPackage(packageName) {
-        if (ts.startsWith(packageName, "@")) {
-            var replaceSlash = packageName.replace(ts.directorySeparator, mangledScopedPackageSeparator);
-            if (replaceSlash !== packageName) {
-                return replaceSlash.slice(1); // Take off the "@"
-            }
-        }
-        return packageName;
-    }
-    ts.getMangledNameForScopedPackage = getMangledNameForScopedPackage;
-    /* @internal */
-    function getPackageNameFromAtTypesDirectory(mangledName) {
-        var withoutAtTypePrefix = ts.removePrefix(mangledName, "@types/");
-        if (withoutAtTypePrefix !== mangledName) {
-            return getUnmangledNameForScopedPackage(withoutAtTypePrefix);
-        }
-        return mangledName;
-    }
-    ts.getPackageNameFromAtTypesDirectory = getPackageNameFromAtTypesDirectory;
-    /* @internal */
-    function getUnmangledNameForScopedPackage(typesPackageName) {
-        return ts.stringContains(typesPackageName, mangledScopedPackageSeparator) ?
-            "@" + typesPackageName.replace(mangledScopedPackageSeparator, ts.directorySeparator) :
-            typesPackageName;
-    }
-    ts.getUnmangledNameForScopedPackage = getUnmangledNameForScopedPackage;
-    function tryFindNonRelativeModuleNameInCache(cache, moduleName, containingDirectory, traceEnabled, host, failedLookupLocations) {
-        var result = cache && cache.get(containingDirectory);
-        if (result) {
-            if (traceEnabled) {
-                trace(host, ts.Diagnostics.Resolution_for_module_0_was_found_in_cache_from_location_1, moduleName, containingDirectory);
-            }
-            failedLookupLocations.push.apply(failedLookupLocations, result.failedLookupLocations);
-            return { value: result.resolvedModule && { path: result.resolvedModule.resolvedFileName, extension: result.resolvedModule.extension, packageId: result.resolvedModule.packageId } };
-        }
-    }
-    function classicNameResolver(moduleName, containingFile, compilerOptions, host, cache) {
-        var traceEnabled = isTraceEnabled(compilerOptions, host);
-        var state = { compilerOptions: compilerOptions, host: host, traceEnabled: traceEnabled };
-        var failedLookupLocations = [];
-        var containingDirectory = ts.getDirectoryPath(containingFile);
-        var resolved = tryResolve(Extensions.TypeScript) || tryResolve(Extensions.JavaScript);
-        // No originalPath because classic resolution doesn't resolve realPath
-        return createResolvedModuleWithFailedLookupLocations(resolved && resolved.value, /*originalPath*/ undefined, /*isExternalLibraryImport*/ false, failedLookupLocations);
-        function tryResolve(extensions) {
-            var resolvedUsingSettings = tryLoadModuleUsingOptionalResolutionSettings(extensions, moduleName, containingDirectory, loadModuleFromFileNoPackageId, failedLookupLocations, state);
-            if (resolvedUsingSettings) {
-                return { value: resolvedUsingSettings };
-            }
-            var perModuleNameCache = cache && cache.getOrCreateCacheForModuleName(moduleName);
-            if (!ts.isExternalModuleNameRelative(moduleName)) {
-                // Climb up parent directories looking for a module.
-                var resolved_3 = ts.forEachAncestorDirectory(containingDirectory, function (directory) {
-                    var resolutionFromCache = tryFindNonRelativeModuleNameInCache(perModuleNameCache, moduleName, directory, traceEnabled, host, failedLookupLocations);
-                    if (resolutionFromCache) {
-                        return resolutionFromCache;
-                    }
-                    var searchName = ts.normalizePath(ts.combinePaths(directory, moduleName));
-                    return toSearchResult(loadModuleFromFileNoPackageId(extensions, searchName, failedLookupLocations, /*onlyRecordFailures*/ false, state));
-                });
-                if (resolved_3) {
-                    return resolved_3;
-                }
-                if (extensions === Extensions.TypeScript) {
-                    // If we didn't find the file normally, look it up in @types.
-                    return loadModuleFromNodeModulesAtTypes(moduleName, containingDirectory, failedLookupLocations, state);
-                }
-            }
-            else {
-                var candidate = ts.normalizePath(ts.combinePaths(containingDirectory, moduleName));
-                return toSearchResult(loadModuleFromFileNoPackageId(extensions, candidate, failedLookupLocations, /*onlyRecordFailures*/ false, state));
-            }
-        }
-    }
-    ts.classicNameResolver = classicNameResolver;
-    /**
-     * LSHost may load a module from a global cache of typings.
-     * This is the minumum code needed to expose that functionality; the rest is in LSHost.
-     */
-    /* @internal */
-    function loadModuleFromGlobalCache(moduleName, projectName, compilerOptions, host, globalCache) {
-        var traceEnabled = isTraceEnabled(compilerOptions, host);
-        if (traceEnabled) {
-            trace(host, ts.Diagnostics.Auto_discovery_for_typings_is_enabled_in_project_0_Running_extra_resolution_pass_for_module_1_using_cache_location_2, projectName, moduleName, globalCache);
-        }
-        var state = { compilerOptions: compilerOptions, host: host, traceEnabled: traceEnabled };
-        var failedLookupLocations = [];
-        var resolved = loadModuleFromNodeModulesOneLevel(Extensions.DtsOnly, moduleName, globalCache, failedLookupLocations, state);
-        return createResolvedModuleWithFailedLookupLocations(resolved, /*originalPath*/ undefined, /*isExternalLibraryImport*/ true, failedLookupLocations);
-    }
-    ts.loadModuleFromGlobalCache = loadModuleFromGlobalCache;
-    /**
-     * Wraps value to SearchResult.
-     * @returns undefined if value is undefined or { value } otherwise
-     */
-    function toSearchResult(value) {
-        return value !== undefined ? { value: value } : undefined;
-    }
-})(ts || (ts = {}));
 /* @internal */
 var ts;
 (function (ts) {
@@ -26789,6 +29183,8 @@ var ts;
             createPromiseType: createPromiseType,
             createArrayType: createArrayType,
             getBooleanType: function () { return booleanType; },
+            getFalseType: function () { return falseType; },
+            getTrueType: function () { return trueType; },
             getVoidType: function () { return voidType; },
             getUndefinedType: function () { return undefinedType; },
             getNullType: function () { return nullType; },
@@ -26874,9 +29270,9 @@ var ts;
         var nullWideningType = strictNullChecks ? nullType : createIntrinsicType(16384 /* Null */ | 134217728 /* ContainsWideningType */, "null");
         var stringType = createIntrinsicType(4 /* String */, "string");
         var numberType = createIntrinsicType(8 /* Number */, "number");
-        var trueType = createIntrinsicType(256 /* BooleanLiteral */, "true");
         var falseType = createIntrinsicType(256 /* BooleanLiteral */, "false");
-        var booleanType = createBooleanType([trueType, falseType]);
+        var trueType = createIntrinsicType(256 /* BooleanLiteral */, "true");
+        var booleanType = createBooleanType([falseType, trueType]);
         var esSymbolType = createIntrinsicType(1024 /* ESSymbol */, "symbol");
         var voidType = createIntrinsicType(4096 /* Void */, "void");
         var neverType = createIntrinsicType(32768 /* Never */, "never");
@@ -27263,17 +29659,17 @@ var ts;
         }
         function getJsxNamespace(location) {
             if (location) {
-                var file_1 = ts.getSourceFileOfNode(location);
-                if (file_1) {
-                    if (file_1.localJsxNamespace) {
-                        return file_1.localJsxNamespace;
+                var file = ts.getSourceFileOfNode(location);
+                if (file) {
+                    if (file.localJsxNamespace) {
+                        return file.localJsxNamespace;
                     }
-                    var jsxPragma = file_1.pragmas.get("jsx");
+                    var jsxPragma = file.pragmas.get("jsx");
                     if (jsxPragma) {
                         var chosenpragma = ts.isArray(jsxPragma) ? jsxPragma[0] : jsxPragma; // TODO: GH#18217
-                        file_1.localJsxFactory = ts.parseIsolatedEntityName(chosenpragma.arguments.factory, languageVersion);
-                        if (file_1.localJsxFactory) {
-                            return file_1.localJsxNamespace = getFirstIdentifier(file_1.localJsxFactory).escapedText;
+                        file.localJsxFactory = ts.parseIsolatedEntityName(chosenpragma.arguments.factory, languageVersion);
+                        if (file.localJsxFactory) {
+                            return file.localJsxNamespace = getFirstIdentifier(file.localJsxFactory).escapedText;
                         }
                     }
                 }
@@ -27401,7 +29797,7 @@ var ts;
                 target.flags |= source.flags;
                 if (source.valueDeclaration &&
                     (!target.valueDeclaration ||
-                        (target.valueDeclaration.kind === 239 /* ModuleDeclaration */ && source.valueDeclaration.kind !== 239 /* ModuleDeclaration */))) {
+                        ts.isEffectiveModuleDeclaration(target.valueDeclaration) && !ts.isEffectiveModuleDeclaration(source.valueDeclaration))) {
                     // other kinds of value declarations take precedence over modules
                     target.valueDeclaration = source.valueDeclaration;
                 }
@@ -28226,8 +30622,8 @@ var ts;
                 else {
                     exportDefaultSymbol = resolveExportByName(moduleSymbol, "default" /* Default */, dontResolveAlias);
                 }
-                var file_2 = ts.find(moduleSymbol.declarations, ts.isSourceFile);
-                var hasSyntheticDefault = canHaveSyntheticDefault(file_2, moduleSymbol, dontResolveAlias);
+                var file = ts.find(moduleSymbol.declarations, ts.isSourceFile);
+                var hasSyntheticDefault = canHaveSyntheticDefault(file, moduleSymbol, dontResolveAlias);
                 if (!exportDefaultSymbol && !hasSyntheticDefault) {
                     error(node.name, ts.Diagnostics.Module_0_has_no_default_export, symbolToString(moduleSymbol));
                 }
@@ -28493,32 +30889,32 @@ var ts;
             else if (name.kind === 146 /* QualifiedName */ || name.kind === 185 /* PropertyAccessExpression */) {
                 var left = name.kind === 146 /* QualifiedName */ ? name.left : name.expression;
                 var right = name.kind === 146 /* QualifiedName */ ? name.right : name.name;
-                var namespace_1 = resolveEntityName(left, namespaceMeaning, ignoreErrors, /*dontResolveAlias*/ false, location);
-                if (!namespace_1 || ts.nodeIsMissing(right)) {
+                var namespace = resolveEntityName(left, namespaceMeaning, ignoreErrors, /*dontResolveAlias*/ false, location);
+                if (!namespace || ts.nodeIsMissing(right)) {
                     return undefined;
                 }
-                else if (namespace_1 === unknownSymbol) {
-                    return namespace_1;
+                else if (namespace === unknownSymbol) {
+                    return namespace;
                 }
                 if (ts.isInJavaScriptFile(name)) {
-                    if (namespace_1.valueDeclaration &&
-                        ts.isVariableDeclaration(namespace_1.valueDeclaration) &&
-                        namespace_1.valueDeclaration.initializer &&
-                        isCommonJsRequire(namespace_1.valueDeclaration.initializer)) {
-                        var moduleName = namespace_1.valueDeclaration.initializer.arguments[0];
+                    if (namespace.valueDeclaration &&
+                        ts.isVariableDeclaration(namespace.valueDeclaration) &&
+                        namespace.valueDeclaration.initializer &&
+                        isCommonJsRequire(namespace.valueDeclaration.initializer)) {
+                        var moduleName = namespace.valueDeclaration.initializer.arguments[0];
                         var moduleSym = resolveExternalModuleName(moduleName, moduleName);
                         if (moduleSym) {
                             var resolvedModuleSymbol = resolveExternalModuleSymbol(moduleSym);
                             if (resolvedModuleSymbol) {
-                                namespace_1 = resolvedModuleSymbol;
+                                namespace = resolvedModuleSymbol;
                             }
                         }
                     }
                 }
-                symbol = getSymbol(getExportsOfSymbol(namespace_1), right.escapedText, meaning);
+                symbol = getSymbol(getExportsOfSymbol(namespace), right.escapedText, meaning);
                 if (!symbol) {
                     if (!ignoreErrors) {
-                        error(right, ts.Diagnostics.Namespace_0_has_no_exported_member_1, getFullyQualifiedName(namespace_1), ts.declarationNameToString(right));
+                        error(right, ts.Diagnostics.Namespace_0_has_no_exported_member_1, getFullyQualifiedName(namespace), ts.declarationNameToString(right));
                     }
                     return undefined;
                 }
@@ -28889,8 +31285,8 @@ var ts;
         }
         function findConstructorDeclaration(node) {
             var members = node.members;
-            for (var _i = 0, members_2 = members; _i < members_2.length; _i++) {
-                var member = members_2[_i];
+            for (var _i = 0, members_1 = members; _i < members_1.length; _i++) {
+                var member = members_1[_i];
                 if (member.kind === 155 /* Constructor */ && ts.nodeIsPresent(member.body)) {
                     return member;
                 }
@@ -29190,7 +31586,7 @@ var ts;
         }
         function hasVisibleDeclarations(symbol, shouldComputeAliasToMakeVisible) {
             var aliasesToMakeVisible;
-            if (ts.forEach(symbol.declarations, function (declaration) { return !getIsDeclarationVisible(declaration); })) {
+            if (!ts.every(symbol.declarations, getIsDeclarationVisible)) {
                 return undefined;
             }
             return { accessibility: 0 /* Accessible */, aliasesToMakeVisible: aliasesToMakeVisible };
@@ -29792,9 +32188,13 @@ var ts;
                         context.enclosingDeclaration = undefined;
                         if (ts.getCheckFlags(propertySymbol) & 1024 /* Late */) {
                             var decl = ts.first(propertySymbol.declarations);
-                            var name = hasLateBindableName(decl) && resolveEntityName(decl.name.expression, 67216319 /* Value */);
-                            if (name && context.tracker.trackSymbol) {
-                                context.tracker.trackSymbol(name, saveEnclosingDeclaration, 67216319 /* Value */);
+                            if (context.tracker.trackSymbol && hasLateBindableName(decl)) {
+                                // get symbol of the first identifier of the entityName
+                                var firstIdentifier = getFirstIdentifier(decl.name.expression);
+                                var name = resolveName(firstIdentifier, firstIdentifier.escapedText, 67216319 /* Value */ | 1048576 /* ExportValue */, /*nodeNotFoundErrorMessage*/ undefined, /*nameArg*/ undefined, /*isUse*/ true);
+                                if (name) {
+                                    context.tracker.trackSymbol(name, saveEnclosingDeclaration, 67216319 /* Value */);
+                                }
                             }
                         }
                         var propertyName = symbolToName(propertySymbol, context, 67216319 /* Value */, /*expectsIdentifier*/ true);
@@ -30253,8 +32653,8 @@ var ts;
             }
             if (symbol.declarations && symbol.declarations.length) {
                 if (ts.some(symbol.declarations, hasExternalModuleSymbol) && context.enclosingDeclaration) { // TODO: GH#18217
-                    var file_3 = ts.getDeclarationOfKind(symbol, 274 /* SourceFile */);
-                    if (!file_3 || !context.tracker.moduleResolverHost) {
+                    var file = ts.getDeclarationOfKind(symbol, 274 /* SourceFile */);
+                    if (!file || !context.tracker.moduleResolverHost) {
                         if (context.tracker.trackReferencedAmbientModule) {
                             var ambientDecls = ts.filter(symbol.declarations, ts.isAmbientModule);
                             if (ts.length(ambientDecls)) {
@@ -30267,7 +32667,8 @@ var ts;
                         // ambient module, just use declaration/symbol name (fallthrough)
                     }
                     else {
-                        return "\"" + ts.getResolvedExternalModuleName(context.tracker.moduleResolverHost, file_3, ts.getSourceFileOfNode(ts.getOriginalNode(context.enclosingDeclaration))) + "\"";
+                        var contextFile = ts.getSourceFileOfNode(ts.getOriginalNode(context.enclosingDeclaration));
+                        return "\"" + (file.moduleName || ts.moduleSpecifiers.getModuleSpecifier(compilerOptions, contextFile, contextFile.path, file.path, context.tracker.moduleResolverHost)) + "\"";
                     }
                 }
                 var declaration = symbol.declarations[0];
@@ -30791,7 +33192,7 @@ var ts;
             var definedInConstructor = false;
             var definedInMethod = false;
             var jsDocType;
-            var _loop_3 = function (declaration) {
+            var _loop_1 = function (declaration) {
                 var declarationInConstructor = false;
                 var expression = declaration.kind === 200 /* BinaryExpression */ ? declaration :
                     declaration.kind === 185 /* PropertyAccessExpression */ ? ts.cast(declaration.parent, ts.isBinaryExpression) :
@@ -30834,20 +33235,20 @@ var ts;
                         special === 2 /* ModuleExports */ &&
                         symbol.escapedName === "export=" /* ExportEquals */) {
                         var exportedType_1 = resolveStructuredTypeMembers(type_2);
-                        var members_3 = ts.createSymbolTable();
-                        ts.copyEntries(exportedType_1.members, members_3);
+                        var members_2 = ts.createSymbolTable();
+                        ts.copyEntries(exportedType_1.members, members_2);
                         symbol.exports.forEach(function (s, name) {
-                            if (members_3.has(name)) {
+                            if (members_2.has(name)) {
                                 var exportedMember = exportedType_1.members.get(name);
                                 var union = createSymbol(s.flags | exportedMember.flags, name);
                                 union.type = getUnionType([getTypeOfSymbol(s), getTypeOfSymbol(exportedMember)]);
-                                members_3.set(name, union);
+                                members_2.set(name, union);
                             }
                             else {
-                                members_3.set(name, s);
+                                members_2.set(name, s);
                             }
                         });
-                        type_2 = createAnonymousType(exportedType_1.symbol, members_3, exportedType_1.callSignatures, exportedType_1.constructSignatures, exportedType_1.stringIndexInfo, exportedType_1.numberIndexInfo);
+                        type_2 = createAnonymousType(exportedType_1.symbol, members_2, exportedType_1.callSignatures, exportedType_1.constructSignatures, exportedType_1.stringIndexInfo, exportedType_1.numberIndexInfo);
                     }
                     var anyedType = type_2;
                     if (isEmptyArrayLiteralType(type_2)) {
@@ -30864,7 +33265,7 @@ var ts;
             };
             for (var _i = 0, _a = symbol.declarations; _i < _a.length; _i++) {
                 var declaration = _a[_i];
-                var state_2 = _loop_3(declaration);
+                var state_2 = _loop_1(declaration);
                 if (typeof state_2 === "object")
                     return state_2.value;
             }
@@ -31333,8 +33734,8 @@ var ts;
         // The function allocates a new array if the input type parameter set is undefined, but otherwise it modifies the set
         // in-place and returns the same array.
         function appendTypeParameters(typeParameters, declarations) {
-            for (var _i = 0, declarations_2 = declarations; _i < declarations_2.length; _i++) {
-                var declaration = declarations_2[_i];
+            for (var _i = 0, declarations_1 = declarations; _i < declarations_1.length; _i++) {
+                var declaration = declarations_1[_i];
                 typeParameters = ts.appendIfUnique(typeParameters, getDeclaredTypeOfTypeParameter(getSymbolOfNode(declaration)));
             }
             return typeParameters;
@@ -31574,7 +33975,7 @@ var ts;
         // object types.
         function isValidBaseType(type) {
             return !!(type.flags & (131072 /* Object */ | 16777216 /* NonPrimitive */ | 1 /* Any */)) && !isGenericMappedType(type) ||
-                !!(type.flags & 524288 /* Intersection */) && !ts.some(type.types, function (t) { return !isValidBaseType(t); });
+                !!(type.flags & 524288 /* Intersection */) && ts.every(type.types, isValidBaseType);
         }
         function resolveBaseTypesOfInterface(type) {
             type.resolvedBaseTypes = type.resolvedBaseTypes || ts.emptyArray;
@@ -31912,8 +34313,8 @@ var ts;
         // we check symbols to see if we can quickly conclude they are free of "this" references, thus needing no instantiation.
         function createInstantiatedSymbolTable(symbols, mapper, mappingThisOnly) {
             var result = ts.createSymbolTable();
-            for (var _i = 0, symbols_2 = symbols; _i < symbols_2.length; _i++) {
-                var symbol = symbols_2[_i];
+            for (var _i = 0, symbols_1 = symbols; _i < symbols_1.length; _i++) {
+                var symbol = symbols_1[_i];
                 result.set(symbol.escapedName, mappingThisOnly && isThisless(symbol) ? symbol : instantiateSymbol(symbol, mapper));
             }
             return result;
@@ -32063,9 +34464,9 @@ var ts;
                         // If we have an existing early-bound member, combine its declarations so that we can
                         // report an error at each declaration.
                         var declarations = earlySymbol ? ts.concatenate(earlySymbol.declarations, lateSymbol.declarations) : lateSymbol.declarations;
-                        var name_2 = ts.declarationNameToString(decl.name);
-                        ts.forEach(declarations, function (declaration) { return error(ts.getNameOfDeclaration(declaration) || declaration, ts.Diagnostics.Duplicate_declaration_0, name_2); });
-                        error(decl.name || decl, ts.Diagnostics.Duplicate_declaration_0, name_2);
+                        var name_1 = ts.declarationNameToString(decl.name);
+                        ts.forEach(declarations, function (declaration) { return error(ts.getNameOfDeclaration(declaration) || declaration, ts.Diagnostics.Duplicate_declaration_0, name_1); });
+                        error(decl.name || decl, ts.Diagnostics.Duplicate_declaration_0, name_1);
                         lateSymbol = createSymbol(0 /* None */, memberName, 1024 /* Late */);
                     }
                     lateSymbol.nameType = type;
@@ -32098,8 +34499,8 @@ var ts;
                     var decl = _a[_i];
                     var members = ts.getMembersOfDeclaration(decl);
                     if (members) {
-                        for (var _b = 0, members_4 = members; _b < members_4.length; _b++) {
-                            var member = members_4[_b];
+                        for (var _b = 0, members_3 = members; _b < members_3.length; _b++) {
+                            var member = members_3[_b];
                             if (isStatic === ts.hasStaticModifier(member) && hasLateBindableName(member)) {
                                 lateBindMember(symbol, earlySymbols, lateSymbols, member);
                             }
@@ -32375,7 +34776,7 @@ var ts;
             var numberIndexInfo;
             var types = type.types;
             var mixinCount = ts.countWhere(types, isMixinConstructorType);
-            var _loop_4 = function (i) {
+            var _loop_2 = function (i) {
                 var t = type.types[i];
                 // When an intersection type contains mixin constructor types, the construct signatures from
                 // those types are discarded and their return types are mixed into the return types of all
@@ -32398,7 +34799,7 @@ var ts;
                 numberIndexInfo = intersectIndexInfos(numberIndexInfo, getIndexInfoOfType(t, 1 /* Number */));
             };
             for (var i = 0; i < types.length; i++) {
-                _loop_4(i);
+                _loop_2(i);
             }
             setStructuredTypeMembers(type, emptySymbols, callSignatures, constructSignatures, stringIndexInfo, numberIndexInfo);
         }
@@ -33978,8 +36379,8 @@ var ts;
         function getTypeOfGlobalSymbol(symbol, arity) {
             function getTypeDeclaration(symbol) {
                 var declarations = symbol.declarations;
-                for (var _i = 0, declarations_3 = declarations; _i < declarations_3.length; _i++) {
-                    var declaration = declarations_3[_i];
+                for (var _i = 0, declarations_2 = declarations; _i < declarations_2.length; _i++) {
+                    var declaration = declarations_2[_i];
                     switch (declaration.kind) {
                         case 235 /* ClassDeclaration */:
                         case 236 /* InterfaceDeclaration */:
@@ -34440,7 +36841,7 @@ var ts;
             var unionType = types[unionIndex];
             var intersection = unionType.types;
             var i = types.length - 1;
-            var _loop_5 = function () {
+            var _loop_3 = function () {
                 var t = types[i];
                 if (t.flags & 67108864 /* UnionOfUnitTypes */) {
                     intersection = ts.filter(intersection, function (u) { return containsType(t.types, u); });
@@ -34449,7 +36850,7 @@ var ts;
                 i--;
             };
             while (i > unionIndex) {
-                _loop_5();
+                _loop_3();
             }
             if (intersection === unionType.types) {
                 return false;
@@ -34838,14 +37239,14 @@ var ts;
             var isDeferred = root.isDistributive && maybeTypeOfKind(checkType, 15794176 /* Instantiable */);
             var combinedMapper;
             if (root.inferTypeParameters) {
-                var context_1 = createInferenceContext(root.inferTypeParameters, /*signature*/ undefined, 0 /* None */);
+                var context = createInferenceContext(root.inferTypeParameters, /*signature*/ undefined, 0 /* None */);
                 if (!isDeferred) {
                     // We don't want inferences from constraints as they may cause us to eagerly resolve the
                     // conditional type instead of deferring resolution. Also, we always want strict function
                     // types rules (i.e. proper contravariance) for inferences.
-                    inferTypes(context_1.inferences, checkType, extendsType, 32 /* NoConstraints */ | 64 /* AlwaysStrict */);
+                    inferTypes(context.inferences, checkType, extendsType, 32 /* NoConstraints */ | 64 /* AlwaysStrict */);
                 }
-                combinedMapper = combineTypeMappers(mapper, context_1);
+                combinedMapper = combineTypeMappers(mapper, context);
             }
             if (!isDeferred) {
                 if (extendsType.flags & 3 /* AnyOrUnknown */) {
@@ -35013,12 +37414,13 @@ var ts;
             return links.resolvedType; // TODO: GH#18217
         }
         function resolveImportSymbolType(node, links, symbol, meaning) {
-            links.resolvedSymbol = symbol;
+            var resolvedSymbol = resolveSymbol(symbol);
+            links.resolvedSymbol = resolvedSymbol;
             if (meaning === 67216319 /* Value */) {
-                return links.resolvedType = getTypeOfSymbol(symbol);
+                return links.resolvedType = getTypeOfSymbol(symbol); // intentionally doesn't use resolved symbol so type is cached as expected on the alias
             }
             else {
-                return links.resolvedType = getTypeReferenceType(node, symbol);
+                return links.resolvedType = getTypeReferenceType(node, resolvedSymbol); // getTypeReferenceType doesn't handle aliases - it must get the resolved symbol
             }
         }
         function getTypeFromTypeLiteralOrFunctionOrConstructorTypeNode(node) {
@@ -35980,7 +38382,7 @@ var ts;
             return type.flags & 131072 /* Object */ ? isEmptyResolvedType(resolveStructuredTypeMembers(type)) :
                 type.flags & 16777216 /* NonPrimitive */ ? true :
                     type.flags & 262144 /* Union */ ? ts.some(type.types, isEmptyObjectType) :
-                        type.flags & 524288 /* Intersection */ ? !ts.some(type.types, function (t) { return !isEmptyObjectType(t); }) :
+                        type.flags & 524288 /* Intersection */ ? ts.every(type.types, isEmptyObjectType) :
                             false;
         }
         function isEnumTypeRelatedTo(sourceSymbol, targetSymbol, errorReporter) {
@@ -36395,7 +38797,7 @@ var ts;
                         // check excess properties against discriminant type only, not the entire union
                         return hasExcessProperties(source, discriminant, /*discriminant*/ undefined, reportErrors);
                     }
-                    var _loop_6 = function (prop) {
+                    var _loop_4 = function (prop) {
                         if (!isKnownProperty(target, prop.escapedName, isComparingJsxAttributes)) {
                             if (reportErrors) {
                                 // We know *exactly* where things went wrong when comparing the types.
@@ -36434,7 +38836,7 @@ var ts;
                     };
                     for (var _i = 0, _a = getPropertiesOfObjectType(source); _i < _a.length; _i++) {
                         var prop = _a[_i];
-                        var state_3 = _loop_6(prop);
+                        var state_3 = _loop_4(prop);
                         if (typeof state_3 === "object")
                             return state_3.value;
                     }
@@ -36880,10 +39282,10 @@ var ts;
                 var modifiersRelated = relation === comparableRelation || (relation === identityRelation ? getMappedTypeModifiers(source) === getMappedTypeModifiers(target) :
                     getCombinedMappedTypeOptionality(source) <= getCombinedMappedTypeOptionality(target));
                 if (modifiersRelated) {
-                    var result_2;
-                    if (result_2 = isRelatedTo(getConstraintTypeFromMappedType(target), getConstraintTypeFromMappedType(source), reportErrors)) {
+                    var result_1;
+                    if (result_1 = isRelatedTo(getConstraintTypeFromMappedType(target), getConstraintTypeFromMappedType(source), reportErrors)) {
                         var mapper = createTypeMapper([getTypeParameterFromMappedType(source)], [getTypeParameterFromMappedType(target)]);
-                        return result_2 & isRelatedTo(instantiateType(getTemplateTypeFromMappedType(source), mapper), getTemplateTypeFromMappedType(target), reportErrors);
+                        return result_1 & isRelatedTo(instantiateType(getTemplateTypeFromMappedType(source), mapper), getTemplateTypeFromMappedType(target), reportErrors);
                     }
                 }
                 return 0 /* False */;
@@ -37576,7 +39978,7 @@ var ts;
         }
         function isLiteralType(type) {
             return type.flags & 16 /* Boolean */ ? true :
-                type.flags & 262144 /* Union */ ? type.flags & 512 /* EnumLiteral */ ? true : !ts.forEach(type.types, function (t) { return !isUnitType(t); }) :
+                type.flags & 262144 /* Union */ ? type.flags & 512 /* EnumLiteral */ ? true : ts.every(type.types, isUnitType) :
                     isUnitType(type);
         }
         function getBaseTypeOfLiteralType(type) {
@@ -37768,6 +40170,19 @@ var ts;
             return context.resolvedProperties;
         }
         function getWidenedProperty(prop, context) {
+            if (!(prop.flags & 4 /* Property */)) {
+                // Since get accessors already widen their return value there is no need to
+                // widen accessor based properties here.
+                return prop;
+            }
+            if (prop.flags & 67108864 /* JSContainer */) {
+                var node = prop.declarations && ts.first(prop.declarations);
+                var init = ts.getAssignedJavascriptInitializer(node);
+                if (init && init.kind !== 184 /* ObjectLiteralExpression */) {
+                    // for JS special declarations, the only kind of initializer that will widen is object literals
+                    return prop;
+                }
+            }
             var original = getTypeOfSymbol(prop);
             var propContext = context && createWideningContext(context, prop.escapedName, /*siblings*/ undefined);
             var widened = getWidenedTypeWithContext(original, propContext);
@@ -37787,9 +40202,7 @@ var ts;
             var members = ts.createSymbolTable();
             for (var _i = 0, _a = getPropertiesOfObjectType(type); _i < _a.length; _i++) {
                 var prop = _a[_i];
-                // Since get accessors already widen their return value there is no need to
-                // widen accessor based properties here.
-                members.set(prop.escapedName, prop.flags & 4 /* Property */ ? getWidenedProperty(prop, context) : prop);
+                members.set(prop.escapedName, getWidenedProperty(prop, context));
             }
             if (context) {
                 for (var _b = 0, _c = getPropertiesOfContext(context); _b < _c.length; _b++) {
@@ -41295,10 +43708,10 @@ var ts;
                 var decl = ts.getDeclarationOfJSInitializer(node);
                 if (decl) {
                     // a JS object literal whose declaration's symbol has exports is a JS namespace
-                    var symbol = getMergedSymbol(decl.symbol);
+                    var symbol = getSymbolOfNode(decl);
                     if (symbol && ts.hasEntries(symbol.exports)) {
                         propertiesTable = symbol.exports;
-                        symbol.exports.forEach(function (symbol) { return propertiesArray.push(getMergedSymbol(symbol)); });
+                        symbol.exports.forEach(function (s) { return propertiesArray.push(getMergedSymbol(s)); });
                         return createObjectLiteralType();
                     }
                 }
@@ -41453,7 +43866,7 @@ var ts;
             return !!(type.flags & (3 /* AnyOrUnknown */ | 16777216 /* NonPrimitive */) ||
                 getFalsyFlags(type) & 29120 /* DefinitelyFalsy */ && isValidSpreadType(removeDefinitelyFalsyTypes(type)) ||
                 type.flags & 131072 /* Object */ && !isGenericMappedType(type) ||
-                type.flags & 786432 /* UnionOrIntersection */ && !ts.forEach(type.types, function (t) { return !isValidSpreadType(t); }));
+                type.flags & 786432 /* UnionOrIntersection */ && ts.every(type.types, isValidSpreadType));
         }
         function checkJsxSelfClosingElement(node, checkMode) {
             checkJsxOpeningLikeElementOrOpeningFragment(node, checkMode);
@@ -42199,7 +44612,7 @@ var ts;
                 // Assignability failure - check each prop individually, and if that fails, fall back on the bad error span
                 if (ts.length(openingLikeElement.attributes.properties)) {
                     var reportedError = false;
-                    var _loop_7 = function (prop) {
+                    var _loop_5 = function (prop) {
                         if (ts.isJsxSpreadAttribute(prop))
                             return "continue";
                         var name = ts.idText(prop.name);
@@ -42213,7 +44626,7 @@ var ts;
                     };
                     for (var _b = 0, _c = openingLikeElement.attributes.properties; _b < _c.length; _b++) {
                         var prop = _c[_b];
-                        _loop_7(prop);
+                        _loop_5(prop);
                     }
                     if (reportedError) {
                         return;
@@ -42574,84 +44987,11 @@ var ts;
          *         and 1 insertion/deletion at 3 characters)
          */
         function getSpellingSuggestionForName(name, symbols, meaning) {
-            var maximumLengthDifference = Math.min(2, Math.floor(name.length * 0.34));
-            var bestDistance = Math.floor(name.length * 0.4) + 1; // If the best result isn't better than this, don't bother.
-            var bestCandidate;
-            var justCheckExactMatches = false;
-            var nameLowerCase = name.toLowerCase();
-            for (var _i = 0, symbols_3 = symbols; _i < symbols_3.length; _i++) {
-                var candidate = symbols_3[_i];
+            return ts.getSpellingSuggestion(name, symbols, getCandidateName);
+            function getCandidateName(candidate) {
                 var candidateName = ts.symbolName(candidate);
-                if (candidateName.charCodeAt(0) === 34 /* doubleQuote */
-                    || !(candidate.flags & meaning && Math.abs(candidateName.length - nameLowerCase.length) <= maximumLengthDifference)) {
-                    continue;
-                }
-                var candidateNameLowerCase = candidateName.toLowerCase();
-                if (candidateNameLowerCase === nameLowerCase) {
-                    return candidate;
-                }
-                if (justCheckExactMatches) {
-                    continue;
-                }
-                if (candidateName.length < 3) {
-                    // Don't bother, user would have noticed a 2-character name having an extra character
-                    continue;
-                }
-                // Only care about a result better than the best so far.
-                var distance = levenshteinWithMax(nameLowerCase, candidateNameLowerCase, bestDistance - 1);
-                if (distance === undefined) {
-                    continue;
-                }
-                if (distance < 3) {
-                    justCheckExactMatches = true;
-                    bestCandidate = candidate;
-                }
-                else {
-                    ts.Debug.assert(distance < bestDistance); // Else `levenshteinWithMax` should return undefined
-                    bestDistance = distance;
-                    bestCandidate = candidate;
-                }
+                return !ts.startsWith(candidateName, "\"") && candidate.flags & meaning ? candidateName : undefined;
             }
-            return bestCandidate;
-        }
-        function levenshteinWithMax(s1, s2, max) {
-            var previous = new Array(s2.length + 1);
-            var current = new Array(s2.length + 1);
-            /** Represents any value > max. We don't care about the particular value. */
-            var big = max + 1;
-            for (var i = 0; i <= s2.length; i++) {
-                previous[i] = i;
-            }
-            for (var i = 1; i <= s1.length; i++) {
-                var c1 = s1.charCodeAt(i - 1);
-                var minJ = i > max ? i - max : 1;
-                var maxJ = s2.length > max + i ? max + i : s2.length;
-                current[0] = i;
-                /** Smallest value of the matrix in the ith column. */
-                var colMin = i;
-                for (var j = 1; j < minJ; j++) {
-                    current[j] = big;
-                }
-                for (var j = minJ; j <= maxJ; j++) {
-                    var dist = c1 === s2.charCodeAt(j - 1)
-                        ? previous[j - 1]
-                        : Math.min(/*delete*/ previous[j] + 1, /*insert*/ current[j - 1] + 1, /*substitute*/ previous[j - 1] + 2);
-                    current[j] = dist;
-                    colMin = Math.min(colMin, dist);
-                }
-                for (var j = maxJ + 1; j <= s2.length; j++) {
-                    current[j] = big;
-                }
-                if (colMin > max) {
-                    // Give up -- everything in this column is > max and it can't get better in future columns.
-                    return undefined;
-                }
-                var temp = previous;
-                previous = current;
-                current = temp;
-            }
-            var res = previous[s2.length];
-            return res > max ? undefined : res;
         }
         function markPropertyAsReferenced(prop, nodeForCheckWriteOnly, isThisAccess) {
             if (!prop || !(prop.flags & 106500 /* ClassMember */) || !prop.valueDeclaration || !ts.hasModifier(prop.valueDeclaration, 8 /* Private */)) {
@@ -43208,13 +45548,13 @@ var ts;
         function getEffectiveCallArguments(node) {
             if (node.kind === 189 /* TaggedTemplateExpression */) {
                 var template = node.template;
-                var args_4 = [undefined]; // TODO: GH#18217
+                var args_1 = [undefined]; // TODO: GH#18217
                 if (template.kind === 202 /* TemplateExpression */) {
                     ts.forEach(template.templateSpans, function (span) {
-                        args_4.push(span.expression);
+                        args_1.push(span.expression);
                     });
                 }
-                return args_4;
+                return args_1;
             }
             else if (node.kind === 150 /* Decorator */) {
                 // For a decorator, we return undefined as we will determine
@@ -43740,7 +46080,7 @@ var ts;
             if (node.expression.kind === 97 /* SuperKeyword */) {
                 var superType = checkSuperExpression(node.expression);
                 if (isTypeAny(superType)) {
-                    ts.forEach(node.arguments, checkExpression); // Still visit arguments so they get marked for visibility, etc
+                    ts.forEach(node.arguments, checkExpresionNoReturn); // Still visit arguments so they get marked for visibility, etc
                     return anySignature;
                 }
                 if (superType !== errorType) {
@@ -44254,8 +46594,8 @@ var ts;
             if (allowSyntheticDefaultImports && type && type !== errorType) {
                 var synthType = type;
                 if (!synthType.syntheticType) {
-                    var file_4 = ts.find(originalSymbol.declarations, ts.isSourceFile);
-                    var hasSyntheticDefault = canHaveSyntheticDefault(file_4, originalSymbol, /*dontResolveAlias*/ false);
+                    var file = ts.find(originalSymbol.declarations, ts.isSourceFile);
+                    var hasSyntheticDefault = canHaveSyntheticDefault(file, originalSymbol, /*dontResolveAlias*/ false);
                     if (hasSyntheticDefault) {
                         var memberTable = ts.createSymbolTable();
                         var newSymbol = createSymbol(2097152 /* Alias */, "default" /* Default */);
@@ -45020,7 +47360,6 @@ var ts;
         }
         function checkObjectLiteralAssignment(node, sourceType) {
             var properties = node.properties;
-            checkGrammarForDisallowedTrailingComma(properties, ts.Diagnostics.A_rest_parameter_or_binding_pattern_may_not_have_a_trailing_comma);
             if (strictNullChecks && properties.length === 0) {
                 return checkNonNullType(sourceType, node);
             }
@@ -45070,6 +47409,7 @@ var ts;
                     }
                 }
                 var type = getRestType(objectLiteralType, nonRestNames, objectLiteralType.symbol);
+                checkGrammarForDisallowedTrailingComma(allProperties, ts.Diagnostics.A_rest_parameter_or_binding_pattern_may_not_have_a_trailing_comma);
                 return checkDestructuringAssignment(property.expression, type);
             }
             else {
@@ -45078,7 +47418,6 @@ var ts;
         }
         function checkArrayLiteralAssignment(node, sourceType, checkMode) {
             var elements = node.elements;
-            checkGrammarForDisallowedTrailingComma(elements, ts.Diagnostics.A_rest_parameter_or_binding_pattern_may_not_have_a_trailing_comma);
             if (languageVersion < 2 /* ES2015 */ && compilerOptions.downlevelIteration) {
                 checkExternalEmitHelpers(node, 512 /* Read */);
             }
@@ -45127,6 +47466,7 @@ var ts;
                             error(restExpression.operatorToken, ts.Diagnostics.A_rest_element_cannot_have_an_initializer);
                         }
                         else {
+                            checkGrammarForDisallowedTrailingComma(node.elements, ts.Diagnostics.A_rest_parameter_or_binding_pattern_may_not_have_a_trailing_comma);
                             return checkDestructuringAssignment(restExpression, createArrayType(elementType), checkMode);
                         }
                     }
@@ -45392,7 +47732,7 @@ var ts;
                         if (propType.symbol && propType.symbol.flags & 32 /* Class */) {
                             var name = prop.escapedName;
                             var symbol = resolveName(prop.valueDeclaration, name, 67901928 /* Type */, undefined, name, /*isUse*/ false);
-                            if (symbol && symbol.declarations.some(function (d) { return d.kind === 297 /* JSDocTypedefTag */; })) {
+                            if (symbol && symbol.declarations.some(ts.isJSDocTypedefTag)) {
                                 grammarErrorOnNode(symbol.declarations[0], ts.Diagnostics.Duplicate_identifier_0, ts.unescapeLeadingUnderscores(name));
                                 return grammarErrorOnNode(prop.valueDeclaration, ts.Diagnostics.Duplicate_identifier_0, ts.unescapeLeadingUnderscores(name));
                             }
@@ -45691,6 +48031,9 @@ var ts;
             node.contextualType = saveContextualType;
             return type;
         }
+        function checkExpresionNoReturn(node) {
+            checkExpression(node);
+        }
         // Checks an expression and returns its type. The contextualMapper parameter serves two purposes: When
         // contextualMapper is not undefined and not equal to the identityMapper function object it indicates that the
         // expression is being inferentially typed (section 4.15.2 in spec) and provides the type mapper to use in
@@ -46623,8 +48966,8 @@ var ts;
             }
             var duplicateFunctionDeclaration = false;
             var multipleConstructorImplementation = false;
-            for (var _i = 0, declarations_4 = declarations; _i < declarations_4.length; _i++) {
-                var current = declarations_4[_i];
+            for (var _i = 0, declarations_3 = declarations; _i < declarations_3.length; _i++) {
+                var current = declarations_3[_i];
                 var node = current;
                 var inAmbientContext = node.flags & 4194304 /* Ambient */;
                 var inAmbientContextOrInterface = node.parent.kind === 236 /* InterfaceDeclaration */ || node.parent.kind === 166 /* TypeLiteral */ || inAmbientContext;
@@ -46793,10 +49136,10 @@ var ts;
                     case 243 /* ImportEqualsDeclaration */:
                     case 246 /* NamespaceImport */:
                     case 245 /* ImportClause */:
-                        var result_3 = 0 /* None */;
+                        var result_2 = 0 /* None */;
                         var target = resolveAlias(getSymbolOfNode(d));
-                        ts.forEach(target.declarations, function (d) { result_3 |= getDeclarationSpaces(d); });
-                        return result_3;
+                        ts.forEach(target.declarations, function (d) { result_2 |= getDeclarationSpaces(d); });
+                        return result_2;
                     case 232 /* VariableDeclaration */:
                     case 182 /* BindingElement */:
                     case 234 /* FunctionDeclaration */:
@@ -47593,8 +49936,8 @@ var ts;
                         : ts.createDiagnosticForNode(declarationList.parent.kind === 214 /* VariableStatement */ ? declarationList.parent : declarationList, ts.Diagnostics.All_variables_are_unused));
                 }
                 else {
-                    for (var _i = 0, declarations_5 = declarations; _i < declarations_5.length; _i++) {
-                        var decl = declarations_5[_i];
+                    for (var _i = 0, declarations_4 = declarations; _i < declarations_4.length; _i++) {
+                        var decl = declarations_4[_i];
                         addDiagnostic(0 /* Local */, ts.createDiagnosticForNode(decl, ts.Diagnostics._0_is_declared_but_its_value_is_never_read, ts.idText(ts.cast(decl.name, ts.isIdentifier))));
                     }
                 }
@@ -48778,8 +51121,8 @@ var ts;
                 if (!areTypeParametersIdentical(declarations, type.localTypeParameters)) {
                     // Report an error on every conflicting declaration.
                     var name = symbolToString(symbol);
-                    for (var _i = 0, declarations_6 = declarations; _i < declarations_6.length; _i++) {
-                        var declaration = declarations_6[_i];
+                    for (var _i = 0, declarations_5 = declarations; _i < declarations_5.length; _i++) {
+                        var declaration = declarations_5[_i];
                         error(declaration.name, ts.Diagnostics.All_declarations_of_0_must_have_identical_type_parameters, name);
                     }
                 }
@@ -48788,8 +51131,8 @@ var ts;
         function areTypeParametersIdentical(declarations, targetParameters) {
             var maxTypeArgumentCount = ts.length(targetParameters);
             var minTypeArgumentCount = getMinTypeArgumentCount(targetParameters);
-            for (var _i = 0, declarations_7 = declarations; _i < declarations_7.length; _i++) {
-                var declaration = declarations_7[_i];
+            for (var _i = 0, declarations_6 = declarations; _i < declarations_6.length; _i++) {
+                var declaration = declarations_6[_i];
                 // If this declaration has too few or too many type parameters, we report an error
                 var sourceParameters = ts.getEffectiveTypeParameterDeclarations(declaration);
                 var numTypeParameters = sourceParameters.length;
@@ -48943,7 +51286,7 @@ var ts;
         function issueMemberSpecificError(node, typeWithThis, baseWithThis, broadDiag) {
             // iterate over all implemented properties and issue errors on each one which isn't compatible, rather than the class as a whole, if possible
             var issuedMemberError = false;
-            var _loop_8 = function (member) {
+            var _loop_6 = function (member) {
                 if (ts.hasStaticModifier(member)) {
                     return "continue";
                 }
@@ -48962,7 +51305,7 @@ var ts;
             };
             for (var _i = 0, _a = node.members; _i < _a.length; _i++) {
                 var member = _a[_i];
-                _loop_8(member);
+                _loop_6(member);
             }
             if (!issuedMemberError) {
                 // check again with diagnostics to generate a less-specific error
@@ -49247,12 +51590,12 @@ var ts;
             function evaluate(expr) {
                 switch (expr.kind) {
                     case 198 /* PrefixUnaryExpression */:
-                        var value_2 = evaluate(expr.operand);
-                        if (typeof value_2 === "number") {
+                        var value_1 = evaluate(expr.operand);
+                        if (typeof value_1 === "number") {
                             switch (expr.operator) {
-                                case 37 /* PlusToken */: return value_2;
-                                case 38 /* MinusToken */: return -value_2;
-                                case 52 /* TildeToken */: return ~value_2;
+                                case 37 /* PlusToken */: return value_1;
+                                case 38 /* MinusToken */: return -value_1;
+                                case 52 /* TildeToken */: return ~value_1;
                             }
                         }
                         break;
@@ -49391,8 +51734,8 @@ var ts;
         }
         function getFirstNonAmbientClassOrFunctionDeclaration(symbol) {
             var declarations = symbol.declarations;
-            for (var _i = 0, declarations_8 = declarations; _i < declarations_8.length; _i++) {
-                var declaration = declarations_8[_i];
+            for (var _i = 0, declarations_7 = declarations; _i < declarations_7.length; _i++) {
+                var declaration = declarations_7[_i];
                 if ((declaration.kind === 235 /* ClassDeclaration */ ||
                     (declaration.kind === 234 /* FunctionDeclaration */ && ts.nodeIsPresent(declaration.body))) &&
                     !(declaration.flags & 4194304 /* Ambient */)) {
@@ -49815,9 +52158,9 @@ var ts;
                     }
                 }
                 // Checks for export * conflicts
-                var exports_1 = getExportsOfModule(moduleSymbol);
-                if (exports_1) {
-                    exports_1.forEach(function (_a, id) {
+                var exports = getExportsOfModule(moduleSymbol);
+                if (exports) {
+                    exports.forEach(function (_a, id) {
                         var declarations = _a.declarations, flags = _a.flags;
                         if (id === "__export") {
                             return;
@@ -49834,8 +52177,8 @@ var ts;
                             return;
                         }
                         if (exportedDeclarationsCount > 1) {
-                            for (var _i = 0, declarations_9 = declarations; _i < declarations_9.length; _i++) {
-                                var declaration = declarations_9[_i];
+                            for (var _i = 0, declarations_8 = declarations; _i < declarations_8.length; _i++) {
+                                var declaration = declarations_8[_i];
                                 if (isNotOverload(declaration)) {
                                     diagnostics.add(ts.createDiagnosticForNode(declaration, ts.Diagnostics.Cannot_redeclare_exported_variable_0, ts.unescapeLeadingUnderscores(id)));
                                 }
@@ -51300,8 +53643,8 @@ var ts;
                     var decl = _a[_i];
                     // check meaning of the local symbol to see if declaration needs to be analyzed further
                     if (decl.symbol && decl.symbol.flags & meaning) {
-                        var file_5 = ts.getSourceFileOfNode(decl);
-                        var typeReferenceDirective = fileToDirective.get(file_5.path);
+                        var file = ts.getSourceFileOfNode(decl);
+                        var typeReferenceDirective = fileToDirective.get(file.path);
                         if (typeReferenceDirective) {
                             (typeReferenceDirectives || (typeReferenceDirectives = [])).push(typeReferenceDirective);
                         }
@@ -51336,8 +53679,8 @@ var ts;
                 // check that at least one declaration of top level symbol originates from type declaration file
                 for (var _i = 0, _a = symbol.declarations; _i < _a.length; _i++) {
                     var decl = _a[_i];
-                    var file_6 = ts.getSourceFileOfNode(decl);
-                    if (fileToDirective.has(file_6.path)) {
+                    var file = ts.getSourceFileOfNode(decl);
+                    if (fileToDirective.has(file.path)) {
                         return true;
                     }
                 }
@@ -51355,25 +53698,25 @@ var ts;
         function initializeTypeChecker() {
             // Bind all source files and propagate errors
             for (var _i = 0, _a = host.getSourceFiles(); _i < _a.length; _i++) {
-                var file_7 = _a[_i];
-                ts.bindSourceFile(file_7, compilerOptions);
+                var file = _a[_i];
+                ts.bindSourceFile(file, compilerOptions);
             }
             // Initialize global symbol table
             var augmentations;
             for (var _b = 0, _c = host.getSourceFiles(); _b < _c.length; _b++) {
-                var file_8 = _c[_b];
-                if (!ts.isExternalOrCommonJsModule(file_8)) {
-                    mergeSymbolTable(globals, file_8.locals);
+                var file = _c[_b];
+                if (!ts.isExternalOrCommonJsModule(file)) {
+                    mergeSymbolTable(globals, file.locals);
                 }
-                if (file_8.patternAmbientModules && file_8.patternAmbientModules.length) {
-                    patternAmbientModules = ts.concatenate(patternAmbientModules, file_8.patternAmbientModules);
+                if (file.patternAmbientModules && file.patternAmbientModules.length) {
+                    patternAmbientModules = ts.concatenate(patternAmbientModules, file.patternAmbientModules);
                 }
-                if (file_8.moduleAugmentations.length) {
-                    (augmentations || (augmentations = [])).push(file_8.moduleAugmentations);
+                if (file.moduleAugmentations.length) {
+                    (augmentations || (augmentations = [])).push(file.moduleAugmentations);
                 }
-                if (file_8.symbol && file_8.symbol.globalExports) {
+                if (file.symbol && file.symbol.globalExports) {
                     // Merge in UMD exports with first-in-wins semantics (see #9771)
-                    var source = file_8.symbol.globalExports;
+                    var source = file.symbol.globalExports;
                     source.forEach(function (sourceSymbol, id) {
                         if (!globals.has(id)) {
                             globals.set(id, sourceSymbol);
@@ -51898,8 +54241,8 @@ var ts;
         }
         function checkGrammarForOmittedArgument(args) {
             if (args) {
-                for (var _i = 0, args_5 = args; _i < args_5.length; _i++) {
-                    var arg = args_5[_i];
+                for (var _i = 0, args_2 = args; _i < args_2.length; _i++) {
+                    var arg = args_2[_i];
                     if (arg.kind === 206 /* OmittedExpression */) {
                         return grammarErrorAtPos(arg, arg.pos, 0, ts.Diagnostics.Argument_expression_expected);
                     }
@@ -54885,11 +57228,12 @@ var ts;
     }
     ts.updateEnumMember = updateEnumMember;
     // Top-level nodes
-    function updateSourceFileNode(node, statements, isDeclarationFile, referencedFiles, typeReferences, hasNoDefaultLib) {
+    function updateSourceFileNode(node, statements, isDeclarationFile, referencedFiles, typeReferences, hasNoDefaultLib, libReferences) {
         if (node.statements !== statements ||
             (isDeclarationFile !== undefined && node.isDeclarationFile !== isDeclarationFile) ||
             (referencedFiles !== undefined && node.referencedFiles !== referencedFiles) ||
             (typeReferences !== undefined && node.typeReferenceDirectives !== typeReferences) ||
+            (libReferences !== undefined && node.libReferenceDirectives !== libReferences) ||
             (hasNoDefaultLib !== undefined && node.hasNoDefaultLib !== hasNoDefaultLib)) {
             var updated = createSynthesizedNode(274 /* SourceFile */);
             updated.flags |= node.flags;
@@ -54902,6 +57246,7 @@ var ts;
             updated.referencedFiles = referencedFiles === undefined ? node.referencedFiles : referencedFiles;
             updated.typeReferenceDirectives = typeReferences === undefined ? node.typeReferenceDirectives : typeReferences;
             updated.hasNoDefaultLib = hasNoDefaultLib === undefined ? node.hasNoDefaultLib : hasNoDefaultLib;
+            updated.libReferenceDirectives = libReferences === undefined ? node.libReferenceDirectives : libReferences;
             if (node.amdDependencies !== undefined)
                 updated.amdDependencies = node.amdDependencies;
             if (node.moduleName !== undefined)
@@ -55058,16 +57403,19 @@ var ts;
         return node;
     }
     ts.createBundle = createBundle;
-    function createUnparsedSourceFile(text) {
+    function createUnparsedSourceFile(text, map) {
         var node = ts.createNode(276 /* UnparsedSource */);
         node.text = text;
+        node.sourceMapText = map;
         return node;
     }
     ts.createUnparsedSourceFile = createUnparsedSourceFile;
-    function createInputFiles(javascript, declaration) {
+    function createInputFiles(javascript, declaration, javascriptMapText, declarationMapText) {
         var node = ts.createNode(277 /* InputFiles */);
         node.javascriptText = javascript;
+        node.javascriptMapText = javascriptMapText;
         node.declarationText = declaration;
+        node.declarationMapText = declarationMapText;
         return node;
     }
     ts.createInputFiles = createInputFiles;
@@ -57865,8 +60213,8 @@ var ts;
         }
         var subtreeFlags = 0 /* None */;
         var nodeArrayFlags = 0 /* None */;
-        for (var _i = 0, nodes_3 = nodes; _i < nodes_3.length; _i++) {
-            var node = nodes_3[_i];
+        for (var _i = 0, nodes_2 = nodes; _i < nodes_2.length; _i++) {
+            var node = nodes_2[_i];
             subtreeFlags |= aggregateTransformFlagsForNode(node);
             nodeArrayFlags |= node.transformFlags & ~536870912 /* HasComputedFlags */;
         }
@@ -58762,7 +61110,7 @@ var ts;
         function transformBundle(node) {
             return ts.createBundle(node.sourceFiles.map(transformSourceFile), ts.mapDefined(node.prepends, function (prepend) {
                 if (prepend.kind === 277 /* InputFiles */) {
-                    return ts.createUnparsedSourceFile(prepend.javascriptText);
+                    return ts.createUnparsedSourceFile(prepend.javascriptText, prepend.javascriptMapText);
                 }
                 return prepend;
             }));
@@ -59931,8 +62279,8 @@ var ts;
         function generateClassElementDecorationExpressions(node, isStatic) {
             var members = getDecoratedClassElements(node, isStatic);
             var expressions;
-            for (var _i = 0, members_5 = members; _i < members_5.length; _i++) {
-                var member = members_5[_i];
+            for (var _i = 0, members_4 = members; _i < members_4.length; _i++) {
+                var member = members_4[_i];
                 var expression = generateClassElementDecorationExpression(node, member);
                 if (expression) {
                     if (!expressions) {
@@ -60295,6 +62643,7 @@ var ts;
                 case 119 /* AnyKeyword */:
                 case 142 /* UnknownKeyword */:
                 case 174 /* ThisType */:
+                case 179 /* ImportType */:
                     break;
                 default:
                     return ts.Debug.failBadSyntaxKind(node);
@@ -64623,6 +66972,7 @@ var ts;
             var singleLine = false; // indicates whether the block *may* be emitted as a single line
             var statementsLocation;
             var closeBraceLocation;
+            var leadingStatements = [];
             var statements = [];
             var body = node.body;
             var statementOffset;
@@ -64630,18 +66980,14 @@ var ts;
             if (ts.isBlock(body)) {
                 // ensureUseStrict is false because no new prologue-directive should be added.
                 // addStandardPrologue will put already-existing directives at the beginning of the target statement-array
-                statementOffset = ts.addStandardPrologue(statements, body.statements, /*ensureUseStrict*/ false);
-            }
-            addCaptureThisForNodeIfNeeded(statements, node);
-            addDefaultValueAssignmentsIfNeeded(statements, node);
-            addRestParameterIfNeeded(statements, node, /*inConstructorWithSynthesizedSuper*/ false);
-            // If we added any generated statements, this must be a multi-line block.
-            if (!multiLine && statements.length > 0) {
-                multiLine = true;
+                statementOffset = ts.addStandardPrologue(leadingStatements, body.statements, /*ensureUseStrict*/ false);
             }
+            addCaptureThisForNodeIfNeeded(leadingStatements, node);
+            addDefaultValueAssignmentsIfNeeded(leadingStatements, node);
+            addRestParameterIfNeeded(leadingStatements, node, /*inConstructorWithSynthesizedSuper*/ false);
             if (ts.isBlock(body)) {
                 // addCustomPrologue puts already-existing directives at the beginning of the target statement-array
-                statementOffset = ts.addCustomPrologue(statements, body.statements, statementOffset, visitor);
+                statementOffset = ts.addCustomPrologue(leadingStatements, body.statements, statementOffset, visitor);
                 statementsLocation = body.statements;
                 ts.addRange(statements, ts.visitNodes(body.statements, visitor, ts.isStatement, statementOffset));
                 // If the original body was a multi-line block, this must be a multi-line block.
@@ -64679,10 +67025,10 @@ var ts;
             ts.prependStatements(statements, lexicalEnvironment);
             prependCaptureNewTargetIfNeeded(statements, node, /*copyOnWrite*/ false);
             // If we added any final generated statements, this must be a multi-line block
-            if (!multiLine && lexicalEnvironment && lexicalEnvironment.length) {
+            if (ts.some(leadingStatements) || ts.some(lexicalEnvironment)) {
                 multiLine = true;
             }
-            var block = ts.createBlock(ts.setTextRange(ts.createNodeArray(statements), statementsLocation), multiLine);
+            var block = ts.createBlock(ts.setTextRange(ts.createNodeArray(leadingStatements.concat(statements)), statementsLocation), multiLine);
             ts.setTextRange(block, node.body);
             if (!multiLine && singleLine) {
                 ts.setEmitFlags(block, 1 /* SingleLine */);
@@ -72476,8 +74822,8 @@ var ts;
                 return;
             }
             necessaryTypeRefernces = necessaryTypeRefernces || ts.createMap();
-            for (var _i = 0, typeReferenceDirectives_2 = typeReferenceDirectives; _i < typeReferenceDirectives_2.length; _i++) {
-                var ref = typeReferenceDirectives_2[_i];
+            for (var _i = 0, typeReferenceDirectives_1 = typeReferenceDirectives; _i < typeReferenceDirectives_1.length; _i++) {
+                var ref = typeReferenceDirectives_1[_i];
                 necessaryTypeRefernces.set(ref, true);
             }
         }
@@ -72560,15 +74906,15 @@ var ts;
                         resultHasExternalModuleIndicator = false; // unused in external module bundle emit (all external modules are within module blocks, therefore are known to be modules)
                         needsDeclare = false;
                         var statements_5 = ts.visitNodes(sourceFile.statements, visitDeclarationStatements);
-                        var newFile = ts.updateSourceFileNode(sourceFile, [ts.createModuleDeclaration([], [ts.createModifier(124 /* DeclareKeyword */)], ts.createLiteral(ts.getResolvedExternalModuleName(context.getEmitHost(), sourceFile)), ts.createModuleBlock(ts.setTextRange(ts.createNodeArray(transformAndReplaceLatePaintedStatements(statements_5)), sourceFile.statements)))], /*isDeclarationFile*/ true, /*referencedFiles*/ [], /*typeReferences*/ [], /*hasNoDefaultLib*/ false);
+                        var newFile = ts.updateSourceFileNode(sourceFile, [ts.createModuleDeclaration([], [ts.createModifier(124 /* DeclareKeyword */)], ts.createLiteral(ts.getResolvedExternalModuleName(context.getEmitHost(), sourceFile)), ts.createModuleBlock(ts.setTextRange(ts.createNodeArray(transformAndReplaceLatePaintedStatements(statements_5)), sourceFile.statements)))], /*isDeclarationFile*/ true, /*referencedFiles*/ [], /*typeReferences*/ [], /*hasNoDefaultLib*/ false, /*libReferences*/ []);
                         return newFile;
                     }
                     needsDeclare = true;
                     var updated = ts.visitNodes(sourceFile.statements, visitDeclarationStatements);
-                    return ts.updateSourceFileNode(sourceFile, transformAndReplaceLatePaintedStatements(updated), /*isDeclarationFile*/ true, /*referencedFiles*/ [], /*typeReferences*/ [], /*hasNoDefaultLib*/ false);
+                    return ts.updateSourceFileNode(sourceFile, transformAndReplaceLatePaintedStatements(updated), /*isDeclarationFile*/ true, /*referencedFiles*/ [], /*typeReferences*/ [], /*hasNoDefaultLib*/ false, /*libReferences*/ []);
                 }), ts.mapDefined(node.prepends, function (prepend) {
                     if (prepend.kind === 277 /* InputFiles */) {
-                        return ts.createUnparsedSourceFile(prepend.declarationText);
+                        return ts.createUnparsedSourceFile(prepend.declarationText, prepend.declarationMapText);
                     }
                 }));
                 bundle.syntheticFileReferences = [];
@@ -73385,7 +75731,7 @@ var ts;
             var prop = ts.createProperty(/*decorators*/ undefined, maskModifiers(node, /*mask*/ undefined, (!accessors.setAccessor) ? 64 /* Readonly */ : 0 /* None */), node.name, node.questionToken, ensureType(node, accessorType), /*initializer*/ undefined);
             var leadingsSyntheticCommentRanges = accessors.secondAccessor && ts.getLeadingCommentRangesOfNode(accessors.secondAccessor, currentSourceFile);
             if (leadingsSyntheticCommentRanges) {
-                var _loop_9 = function (range) {
+                var _loop_7 = function (range) {
                     if (range.kind === 3 /* MultiLineCommentTrivia */) {
                         var text = currentSourceFile.text.slice(range.pos + 2, range.end - 2);
                         var lines = text.split(/\r\n?|\n/g);
@@ -73399,7 +75745,7 @@ var ts;
                 };
                 for (var _i = 0, leadingsSyntheticCommentRanges_1 = leadingsSyntheticCommentRanges; _i < leadingsSyntheticCommentRanges_1.length; _i++) {
                     var range = leadingsSyntheticCommentRanges_1[_i];
-                    _loop_9(range);
+                    _loop_7(range);
                 }
             }
             return prop;
@@ -73608,8 +75954,8 @@ var ts;
             }
         };
         // Ensure the parse tree is clean before applying transformations
-        for (var _i = 0, nodes_4 = nodes; _i < nodes_4.length; _i++) {
-            var node = nodes_4[_i];
+        for (var _i = 0, nodes_3 = nodes; _i < nodes_3.length; _i++) {
+            var node = nodes_3[_i];
             ts.disposeEmitNodes(ts.getSourceFileOfNode(ts.getParseTreeNode(node)));
         }
         ts.performance.mark("beforeTransform");
@@ -73800,8 +76146,8 @@ var ts;
         function dispose() {
             if (state < 3 /* Disposed */) {
                 // Clean up emit nodes on parse tree
-                for (var _i = 0, nodes_5 = nodes; _i < nodes_5.length; _i++) {
-                    var node = nodes_5[_i];
+                for (var _i = 0, nodes_4 = nodes; _i < nodes_4.length; _i++) {
+                    var node = nodes_4[_i];
                     ts.disposeEmitNodes(ts.getSourceFileOfNode(ts.getParseTreeNode(node)));
                 }
                 // Release references to external entries for GC purposes.
@@ -73846,6 +76192,9 @@ var ts;
         var sourceMapData;
         var sourceMapDataList;
         var disabled = !(compilerOptions.sourceMap || compilerOptions.inlineSourceMap);
+        var completedSections;
+        var sectionStartLine;
+        var sectionStartColumn;
         return {
             initialize: initialize,
             reset: reset,
@@ -73886,6 +76235,9 @@ var ts;
             lastEncodedSourceMapSpan = defaultLastEncodedSourceMapSpan;
             lastEncodedNameIndex = 0;
             // Initialize source map data
+            completedSections = [];
+            sectionStartLine = 1;
+            sectionStartColumn = 1;
             sourceMapData = {
                 sourceMapFilePath: sourceMapFilePath,
                 jsSourceMappingURL: !compilerOptions.inlineSourceMap ? ts.getBaseFileName(ts.normalizeSlashes(sourceMapFilePath)) : undefined,
@@ -73946,6 +76298,39 @@ var ts;
             lastEncodedNameIndex = undefined;
             sourceMapData = undefined;
             sourceMapDataList = undefined;
+            completedSections = undefined;
+            sectionStartLine = undefined;
+            sectionStartColumn = undefined;
+        }
+        function captureSection() {
+            return {
+                version: 3,
+                file: sourceMapData.sourceMapFile,
+                sourceRoot: sourceMapData.sourceMapSourceRoot,
+                sources: sourceMapData.sourceMapSources,
+                names: sourceMapData.sourceMapNames,
+                mappings: sourceMapData.sourceMapMappings,
+                sourcesContent: sourceMapData.sourceMapSourcesContent,
+            };
+        }
+        function resetSectionalData() {
+            sourceMapData.sourceMapSources = [];
+            sourceMapData.sourceMapNames = [];
+            sourceMapData.sourceMapMappings = "";
+            sourceMapData.sourceMapSourcesContent = compilerOptions.inlineSources ? [] : undefined;
+        }
+        function generateMap() {
+            if (completedSections.length) {
+                captureSectionalSpanIfNeeded(/*reset*/ false);
+                return {
+                    version: 3,
+                    file: sourceMapData.sourceMapFile,
+                    sections: completedSections
+                };
+            }
+            else {
+                return captureSection();
+            }
         }
         // Encoding for sourcemap span
         function encodeLastRecordedSourceMapSpan() {
@@ -74003,8 +76388,8 @@ var ts;
             // Convert the location to be one-based.
             sourceLinePos.line++;
             sourceLinePos.character++;
-            var emittedLine = writer.getLine();
-            var emittedColumn = writer.getColumn();
+            var emittedLine = writer.getLine() - sectionStartLine + 1;
+            var emittedColumn = emittedLine === 0 ? (writer.getColumn() - sectionStartColumn + 1) : writer.getColumn();
             // If this location wasn't recorded or the location in source is going backwards, record the span
             if (!lastRecordedSourceMapSpan ||
                 lastRecordedSourceMapSpan.emittedLine !== emittedLine ||
@@ -74034,6 +76419,14 @@ var ts;
                 ts.performance.measure("Source Map", "beforeSourcemap", "afterSourcemap");
             }
         }
+        function captureSectionalSpanIfNeeded(reset) {
+            if (lastRecordedSourceMapSpan && lastRecordedSourceMapSpan === lastEncodedSourceMapSpan) { // If we've recorded some spans, save them
+                completedSections.push({ offset: { line: sectionStartLine - 1, column: sectionStartColumn - 1 }, map: captureSection() });
+                if (reset) {
+                    resetSectionalData();
+                }
+            }
+        }
         /**
          * Emits a node with possible leading and trailing source maps.
          *
@@ -74046,10 +76439,38 @@ var ts;
                 return emitCallback(hint, node);
             }
             if (node) {
+                if (ts.isUnparsedSource(node) && node.sourceMapText !== undefined) {
+                    captureSectionalSpanIfNeeded(/*reset*/ true);
+                    var text = node.sourceMapText;
+                    var parsed = void 0;
+                    try {
+                        parsed = JSON.parse(text);
+                    }
+                    catch (_a) {
+                        // empty
+                    }
+                    var offset = { line: writer.getLine() - 1, column: writer.getColumn() - 1 };
+                    completedSections.push(parsed
+                        ? {
+                            offset: offset,
+                            map: parsed
+                        }
+                        : {
+                            offset: offset,
+                            // This is just passes the buck on sourcemaps we don't really understand, instead of issuing an error (which would be difficult this late)
+                            url: "data:application/json;charset=utf-8;base64," + ts.base64encode(ts.sys, text)
+                        });
+                    var emitResult = emitCallback(hint, node);
+                    sectionStartLine = writer.getLine();
+                    sectionStartColumn = writer.getColumn();
+                    lastRecordedSourceMapSpan = undefined;
+                    lastEncodedSourceMapSpan = defaultLastEncodedSourceMapSpan;
+                    return emitResult;
+                }
                 var emitNode = node.emitNode;
                 var emitFlags = emitNode && emitNode.flags || 0 /* None */;
                 var range = emitNode && emitNode.sourceMapRange;
-                var _a = range || node, pos = _a.pos, end = _a.end;
+                var _b = range || node, pos = _b.pos, end = _b.end;
                 var source = range && range.source;
                 var oldSource = currentSource;
                 if (source === oldSource)
@@ -74151,15 +76572,7 @@ var ts;
                 return undefined; // TODO: GH#18217
             }
             encodeLastRecordedSourceMapSpan();
-            return JSON.stringify({
-                version: 3,
-                file: sourceMapData.sourceMapFile,
-                sourceRoot: sourceMapData.sourceMapSourceRoot,
-                sources: sourceMapData.sourceMapSources,
-                names: sourceMapData.sourceMapNames,
-                mappings: sourceMapData.sourceMapMappings,
-                sourcesContent: sourceMapData.sourceMapSourcesContent,
-            });
+            return JSON.stringify(generateMap());
         }
         /**
          * Gets the SourceMappingURL for the source map.
@@ -75489,7 +77902,7 @@ var ts;
         }
         // SyntaxKind.UnparsedSource
         function emitUnparsedSource(unparsed) {
-            write(unparsed.text);
+            writer.rawWrite(unparsed.text);
         }
         //
         // Identifiers
@@ -77290,8 +79703,8 @@ var ts;
         function writeLines(text) {
             var lines = text.split(/\r\n?|\n/g);
             var indentation = ts.guessIndentation(lines);
-            for (var _a = 0, lines_2 = lines; _a < lines_2.length; _a++) {
-                var lineText = lines_2[_a];
+            for (var _a = 0, lines_1 = lines; _a < lines_1.length; _a++) {
+                var lineText = lines_1[_a];
                 var line = indentation ? lineText.slice(indentation) : lineText;
                 if (line.length) {
                     writeLine();
@@ -78304,7 +80717,10 @@ var ts;
             getEnvironmentVariable: function (name) { return ts.sys.getEnvironmentVariable ? ts.sys.getEnvironmentVariable(name) : ""; },
             getDirectories: function (path) { return ts.sys.getDirectories(path); },
             realpath: realpath,
-            readDirectory: function (path, extensions, include, exclude, depth) { return ts.sys.readDirectory(path, extensions, include, exclude, depth); }
+            readDirectory: function (path, extensions, include, exclude, depth) { return ts.sys.readDirectory(path, extensions, include, exclude, depth); },
+            getModifiedTime: ts.sys.getModifiedTime && (function (path) { return ts.sys.getModifiedTime(path); }),
+            setModifiedTime: ts.sys.setModifiedTime && (function (path, date) { return ts.sys.setModifiedTime(path, date); }),
+            deleteFile: ts.sys.deleteFile && (function (path) { return ts.sys.deleteFile(path); })
         };
     }
     ts.createCompilerHost = createCompilerHost;
@@ -78372,52 +80788,52 @@ var ts;
         var output = "";
         for (var _i = 0, diagnostics_2 = diagnostics; _i < diagnostics_2.length; _i++) {
             var diagnostic = diagnostics_2[_i];
-            var context_2 = "";
+            var context = "";
             if (diagnostic.file) {
-                var start = diagnostic.start, length_4 = diagnostic.length, file_9 = diagnostic.file;
-                var _a = ts.getLineAndCharacterOfPosition(file_9, start), firstLine = _a.line, firstLineChar = _a.character; // TODO: GH#18217
-                var _b = ts.getLineAndCharacterOfPosition(file_9, start + length_4), lastLine = _b.line, lastLineChar = _b.character;
-                var lastLineInFile = ts.getLineAndCharacterOfPosition(file_9, file_9.text.length).line;
-                var relativeFileName = host ? ts.convertToRelativePath(file_9.fileName, host.getCurrentDirectory(), function (fileName) { return host.getCanonicalFileName(fileName); }) : file_9.fileName;
+                var start = diagnostic.start, length_4 = diagnostic.length, file = diagnostic.file;
+                var _a = ts.getLineAndCharacterOfPosition(file, start), firstLine = _a.line, firstLineChar = _a.character; // TODO: GH#18217
+                var _b = ts.getLineAndCharacterOfPosition(file, start + length_4), lastLine = _b.line, lastLineChar = _b.character;
+                var lastLineInFile = ts.getLineAndCharacterOfPosition(file, file.text.length).line;
+                var relativeFileName = host ? ts.convertToRelativePath(file.fileName, host.getCurrentDirectory(), function (fileName) { return host.getCanonicalFileName(fileName); }) : file.fileName;
                 var hasMoreThanFiveLines = (lastLine - firstLine) >= 4;
                 var gutterWidth = (lastLine + 1 + "").length;
                 if (hasMoreThanFiveLines) {
                     gutterWidth = Math.max(ellipsis.length, gutterWidth);
                 }
                 for (var i = firstLine; i <= lastLine; i++) {
-                    context_2 += host.getNewLine();
+                    context += host.getNewLine();
                     // If the error spans over 5 lines, we'll only show the first 2 and last 2 lines,
                     // so we'll skip ahead to the second-to-last line.
                     if (hasMoreThanFiveLines && firstLine + 1 < i && i < lastLine - 1) {
-                        context_2 += formatColorAndReset(padLeft(ellipsis, gutterWidth), gutterStyleSequence) + gutterSeparator + host.getNewLine();
+                        context += formatColorAndReset(padLeft(ellipsis, gutterWidth), gutterStyleSequence) + gutterSeparator + host.getNewLine();
                         i = lastLine - 1;
                     }
-                    var lineStart = ts.getPositionOfLineAndCharacter(file_9, i, 0);
-                    var lineEnd = i < lastLineInFile ? ts.getPositionOfLineAndCharacter(file_9, i + 1, 0) : file_9.text.length;
-                    var lineContent = file_9.text.slice(lineStart, lineEnd);
+                    var lineStart = ts.getPositionOfLineAndCharacter(file, i, 0);
+                    var lineEnd = i < lastLineInFile ? ts.getPositionOfLineAndCharacter(file, i + 1, 0) : file.text.length;
+                    var lineContent = file.text.slice(lineStart, lineEnd);
                     lineContent = lineContent.replace(/\s+$/g, ""); // trim from end
                     lineContent = lineContent.replace("\t", " "); // convert tabs to single spaces
                     // Output the gutter and the actual contents of the line.
-                    context_2 += formatColorAndReset(padLeft(i + 1 + "", gutterWidth), gutterStyleSequence) + gutterSeparator;
-                    context_2 += lineContent + host.getNewLine();
+                    context += formatColorAndReset(padLeft(i + 1 + "", gutterWidth), gutterStyleSequence) + gutterSeparator;
+                    context += lineContent + host.getNewLine();
                     // Output the gutter and the error span for the line using tildes.
-                    context_2 += formatColorAndReset(padLeft("", gutterWidth), gutterStyleSequence) + gutterSeparator;
-                    context_2 += ForegroundColorEscapeSequences.Red;
+                    context += formatColorAndReset(padLeft("", gutterWidth), gutterStyleSequence) + gutterSeparator;
+                    context += ForegroundColorEscapeSequences.Red;
                     if (i === firstLine) {
                         // If we're on the last line, then limit it to the last character of the last line.
                         // Otherwise, we'll just squiggle the rest of the line, giving 'slice' no end position.
                         var lastCharForLine = i === lastLine ? lastLineChar : undefined;
-                        context_2 += lineContent.slice(0, firstLineChar).replace(/\S/g, " ");
-                        context_2 += lineContent.slice(firstLineChar, lastCharForLine).replace(/./g, "~");
+                        context += lineContent.slice(0, firstLineChar).replace(/\S/g, " ");
+                        context += lineContent.slice(firstLineChar, lastCharForLine).replace(/./g, "~");
                     }
                     else if (i === lastLine) {
-                        context_2 += lineContent.slice(0, lastLineChar).replace(/./g, "~");
+                        context += lineContent.slice(0, lastLineChar).replace(/./g, "~");
                     }
                     else {
                         // Squiggle the entire line.
-                        context_2 += lineContent.replace(/./g, "~");
+                        context += lineContent.replace(/./g, "~");
                     }
-                    context_2 += resetEscapeSequence;
+                    context += resetEscapeSequence;
                 }
                 output += formatColorAndReset(relativeFileName, ForegroundColorEscapeSequences.Cyan);
                 output += ":";
@@ -78431,11 +80847,11 @@ var ts;
             output += flattenDiagnosticMessageText(diagnostic.messageText, host.getNewLine());
             if (diagnostic.file) {
                 output += host.getNewLine();
-                output += context_2;
+                output += context;
             }
             output += host.getNewLine();
         }
-        return output + host.getNewLine();
+        return output;
     }
     ts.formatDiagnosticsWithColorAndContext = formatDiagnosticsWithColorAndContext;
     function flattenDiagnosticMessageText(messageText, newLine) {
@@ -78554,7 +80970,9 @@ var ts;
         var rootNames = createProgramOptions.rootNames, options = createProgramOptions.options, configFileParsingDiagnostics = createProgramOptions.configFileParsingDiagnostics, projectReferences = createProgramOptions.projectReferences;
         var oldProgram = createProgramOptions.oldProgram;
         var program;
-        var files = [];
+        var processingDefaultLibFiles;
+        var processingOtherFiles;
+        var files;
         var commonSourceDirectory;
         var diagnosticsProducingTypeChecker;
         var noDiagnosticsTypeChecker;
@@ -78633,24 +81051,26 @@ var ts;
         // A parallel array to projectReferences storing the results of reading in the referenced tsconfig files
         var resolvedProjectReferences = projectReferences ? [] : undefined;
         var projectReferenceRedirects = ts.createMap();
-        if (projectReferences) {
-            for (var _i = 0, projectReferences_1 = projectReferences; _i < projectReferences_1.length; _i++) {
-                var ref = projectReferences_1[_i];
-                var parsedRef = parseProjectReferenceConfigFile(ref);
-                resolvedProjectReferences.push(parsedRef);
-                if (parsedRef) {
-                    if (parsedRef.commandLine.options.outFile) {
-                        var dtsOutfile = ts.changeExtension(parsedRef.commandLine.options.outFile, ".d.ts");
-                        processSourceFile(dtsOutfile, /*isDefaultLib*/ false, /*packageId*/ undefined);
-                    }
-                    addProjectReferenceRedirects(parsedRef.commandLine, projectReferenceRedirects);
-                }
-            }
-        }
         var shouldCreateNewSourceFile = shouldProgramCreateNewSourceFiles(oldProgram, options);
         var structuralIsReused = tryReuseStructureFromOldProgram();
         if (structuralIsReused !== 2 /* Completely */) {
-            ts.forEach(rootNames, function (name) { return processRootFile(name, /*isDefaultLib*/ false); });
+            processingDefaultLibFiles = [];
+            processingOtherFiles = [];
+            if (projectReferences) {
+                for (var _i = 0, projectReferences_1 = projectReferences; _i < projectReferences_1.length; _i++) {
+                    var ref = projectReferences_1[_i];
+                    var parsedRef = parseProjectReferenceConfigFile(ref);
+                    resolvedProjectReferences.push(parsedRef);
+                    if (parsedRef) {
+                        if (parsedRef.commandLine.options.outFile) {
+                            var dtsOutfile = ts.changeExtension(parsedRef.commandLine.options.outFile, ".d.ts");
+                            processSourceFile(dtsOutfile, /*isDefaultLib*/ false, /*ignoreNoDefaultLib*/ false, /*packageId*/ undefined);
+                        }
+                        addProjectReferenceRedirects(parsedRef.commandLine, projectReferenceRedirects);
+                    }
+                }
+            }
+            ts.forEach(rootNames, function (name) { return processRootFile(name, /*isDefaultLib*/ false, /*ignoreNoDefaultLib*/ false); });
             // load type declarations specified via 'types' argument or implicitly from types/ and node_modules/@types folders
             var typeReferences = ts.getAutomaticTypeDirectiveNames(options, host);
             if (typeReferences.length) {
@@ -78671,15 +81091,18 @@ var ts;
                 // otherwise, using options specified in '--lib' instead of '--target' default library file
                 var defaultLibraryFileName = getDefaultLibraryFileName();
                 if (!options.lib && defaultLibraryFileName) {
-                    processRootFile(defaultLibraryFileName, /*isDefaultLib*/ true);
+                    processRootFile(defaultLibraryFileName, /*isDefaultLib*/ true, /*ignoreNoDefaultLib*/ false);
                 }
                 else {
                     ts.forEach(options.lib, function (libFileName) {
-                        processRootFile(ts.combinePaths(defaultLibraryPath, libFileName), /*isDefaultLib*/ true);
+                        processRootFile(ts.combinePaths(defaultLibraryPath, libFileName), /*isDefaultLib*/ true, /*ignoreNoDefaultLib*/ false);
                     });
                 }
             }
             missingFilePaths = ts.arrayFrom(filesByName.keys(), function (p) { return p; }).filter(function (p) { return !filesByName.get(p); });
+            files = ts.stableSort(processingDefaultLibFiles, compareDefaultLibFiles).concat(processingOtherFiles);
+            processingDefaultLibFiles = undefined;
+            processingOtherFiles = undefined;
         }
         ts.Debug.assert(!!missingFilePaths);
         // Release any files we have acquired in the old program but are
@@ -78724,6 +81147,7 @@ var ts;
             isSourceFileDefaultLibrary: isSourceFileDefaultLibrary,
             dropDiagnosticsProducingTypeChecker: dropDiagnosticsProducingTypeChecker,
             getSourceFileFromReference: getSourceFileFromReference,
+            getLibFileFromReference: getLibFileFromReference,
             sourceFileToPackageName: sourceFileToPackageName,
             redirectTargetsSet: redirectTargetsSet,
             isEmittedFile: isEmittedFile,
@@ -78735,6 +81159,21 @@ var ts;
         ts.performance.mark("afterProgram");
         ts.performance.measure("Program", "beforeProgram", "afterProgram");
         return program;
+        function compareDefaultLibFiles(a, b) {
+            return ts.compareValues(getDefaultLibFilePriority(a), getDefaultLibFilePriority(b));
+        }
+        function getDefaultLibFilePriority(a) {
+            if (ts.containsPath(defaultLibraryPath, a.fileName, /*ignoreCase*/ false)) {
+                var basename = ts.getBaseFileName(a.fileName);
+                if (basename === "lib.d.ts" || basename === "lib.es6.d.ts")
+                    return 0;
+                var name = ts.removeSuffix(ts.removePrefix(basename, "lib."), ".d.ts");
+                var index = ts.libs.indexOf(name);
+                if (index !== -1)
+                    return index + 1;
+            }
+            return ts.libs.length + 2;
+        }
         function getResolvedModuleWithFailedLookupLocationsFromCache(moduleName, containingFile) {
             return moduleResolutionCache && ts.resolveModuleNameFromCache(moduleName, containingFile, moduleResolutionCache);
         }
@@ -78793,13 +81232,13 @@ var ts;
                 // which per above occurred during the current program creation.
                 // Since we assume the filesystem does not change during program creation,
                 // it is safe to reuse resolutions from the earlier call.
-                var result_4 = [];
+                var result_3 = [];
                 for (var _i = 0, moduleNames_1 = moduleNames; _i < moduleNames_1.length; _i++) {
                     var moduleName = moduleNames_1[_i];
                     var resolvedModule = file.resolvedModules.get(moduleName);
-                    result_4.push(resolvedModule);
+                    result_3.push(resolvedModule);
                 }
-                return result_4;
+                return result_3;
             }
             // At this point, we know at least one of the following hold:
             // - file has local declarations for ambient modules
@@ -78979,7 +81418,7 @@ var ts;
             for (var _i = 0, oldSourceFiles_2 = oldSourceFiles; _i < oldSourceFiles_2.length; _i++) {
                 var oldSourceFile = oldSourceFiles_2[_i];
                 var newSourceFile = host.getSourceFileByPath
-                    ? host.getSourceFileByPath(oldSourceFile.fileName, oldSourceFile.path, options.target, /*onError*/ undefined, shouldCreateNewSourceFile)
+                    ? host.getSourceFileByPath(oldSourceFile.fileName, oldSourceFile.resolvedPath || oldSourceFile.path, options.target, /*onError*/ undefined, shouldCreateNewSourceFile)
                     : host.getSourceFile(oldSourceFile.fileName, options.target, /*onError*/ undefined, shouldCreateNewSourceFile); // TODO: GH#18217
                 if (!newSourceFile) {
                     return oldProgram.structureIsReused = 0 /* Not */;
@@ -79021,6 +81460,10 @@ var ts;
                 }
                 if (fileChanged) {
                     // The `newSourceFile` object was created for the new program.
+                    if (!ts.arrayIsEqualTo(oldSourceFile.libReferenceDirectives, newSourceFile.libReferenceDirectives, fileReferenceIsEqualTo)) {
+                        // 'lib' references has changed. Matches behavior in changesAffectModuleResolution
+                        return oldProgram.structureIsReused = 0 /* Not */;
+                    }
                     if (oldSourceFile.hasNoDefaultLib !== newSourceFile.hasNoDefaultLib) {
                         // value of no-default-lib has changed
                         // this will affect if default library is injected into the list of files
@@ -79124,20 +81567,8 @@ var ts;
             return oldProgram.structureIsReused = 2 /* Completely */;
         }
         function getEmitHost(writeFileCallback) {
-            return {
-                getPrependNodes: getPrependNodes,
-                getCanonicalFileName: getCanonicalFileName,
-                getCommonSourceDirectory: program.getCommonSourceDirectory,
-                getCompilerOptions: program.getCompilerOptions,
-                getCurrentDirectory: function () { return currentDirectory; },
-                getNewLine: function () { return host.getNewLine(); },
-                getSourceFile: program.getSourceFile,
-                getSourceFileByPath: program.getSourceFileByPath,
-                getSourceFiles: program.getSourceFiles,
-                isSourceFileFromExternalLibrary: isSourceFileFromExternalLibrary,
-                writeFile: writeFileCallback || (function (fileName, data, writeByteOrderMark, onError, sourceFiles) { return host.writeFile(fileName, data, writeByteOrderMark, onError, sourceFiles); }),
-                isEmitBlocked: isEmitBlocked,
-            };
+            return __assign({ getPrependNodes: getPrependNodes,
+                getCanonicalFileName: getCanonicalFileName, getCommonSourceDirectory: program.getCommonSourceDirectory, getCompilerOptions: program.getCompilerOptions, getCurrentDirectory: function () { return currentDirectory; }, getNewLine: function () { return host.getNewLine(); }, getSourceFile: program.getSourceFile, getSourceFileByPath: program.getSourceFileByPath, getSourceFiles: program.getSourceFiles, isSourceFileFromExternalLibrary: isSourceFileFromExternalLibrary, writeFile: writeFileCallback || (function (fileName, data, writeByteOrderMark, onError, sourceFiles) { return host.writeFile(fileName, data, writeByteOrderMark, onError, sourceFiles); }), isEmitBlocked: isEmitBlocked, readFile: function (f) { return host.readFile(f); }, fileExists: function (f) { return host.fileExists(f); } }, (host.directoryExists ? { directoryExists: function (f) { return host.directoryExists(f); } } : {}));
         }
         function getProjectReferences() {
             if (!resolvedProjectReferences)
@@ -79158,8 +81589,10 @@ var ts;
                         continue;
                     var dtsFilename = ts.changeExtension(resolvedRefOpts.options.outFile, ".d.ts");
                     var js = host.readFile(resolvedRefOpts.options.outFile) || "/* Input file " + resolvedRefOpts.options.outFile + " was missing */\r\n";
+                    var jsMap = host.readFile(resolvedRefOpts.options.outFile + ".map"); // TODO: try to read sourceMappingUrl comment from the js file
                     var dts = host.readFile(dtsFilename) || "/* Input file " + dtsFilename + " was missing */\r\n";
-                    var node = ts.createInputFiles(js, dts);
+                    var dtsMap = host.readFile(dtsFilename + ".map");
+                    var node = ts.createInputFiles(js, dts, jsMap, dtsMap);
                     nodes.push(node);
                 }
             }
@@ -79503,8 +81936,8 @@ var ts;
                             }
                             break;
                     }
-                    for (var _b = 0, nodes_6 = nodes; _b < nodes_6.length; _b++) {
-                        var node = nodes_6[_b];
+                    for (var _b = 0, nodes_5 = nodes; _b < nodes_5.length; _b++) {
+                        var node = nodes_5[_b];
                         walk(node);
                     }
                 }
@@ -79585,8 +82018,8 @@ var ts;
         function getConfigFileParsingDiagnostics() {
             return configFileParsingDiagnostics || ts.emptyArray;
         }
-        function processRootFile(fileName, isDefaultLib) {
-            processSourceFile(ts.normalizePath(fileName), isDefaultLib, /*packageId*/ undefined);
+        function processRootFile(fileName, isDefaultLib, ignoreNoDefaultLib) {
+            processSourceFile(ts.normalizePath(fileName), isDefaultLib, ignoreNoDefaultLib, /*packageId*/ undefined);
         }
         function fileReferenceIsEqualTo(a, b) {
             return a.fileName === b.fileName;
@@ -79686,17 +82119,22 @@ var ts;
                 else if (ts.isLiteralImportTypeNode(node)) {
                     imports = ts.append(imports, node.argument.literal);
                 }
-                else {
-                    collectDynamicImportOrRequireCallsForEachChild(node);
-                    if (ts.hasJSDocNodes(node)) {
-                        ts.forEach(node.jsDoc, collectDynamicImportOrRequireCallsForEachChild);
-                    }
+                collectDynamicImportOrRequireCallsForEachChild(node);
+                if (ts.hasJSDocNodes(node)) {
+                    ts.forEach(node.jsDoc, collectDynamicImportOrRequireCallsForEachChild);
                 }
             }
             function collectDynamicImportOrRequireCallsForEachChild(node) {
                 ts.forEachChild(node, collectDynamicImportOrRequireCalls);
             }
         }
+        function getLibFileFromReference(ref) {
+            var libName = ref.fileName.toLocaleLowerCase();
+            var libFileName = ts.libMap.get(libName);
+            if (libFileName) {
+                return getSourceFile(ts.combinePaths(defaultLibraryPath, libFileName));
+            }
+        }
         /** This should have similar behavior to 'processSourceFile' without diagnostics or mutation. */
         function getSourceFileFromReference(referencingFile, ref) {
             return getSourceFileFromReferenceWorker(resolveTripleslashReference(ref.fileName, referencingFile.fileName), function (fileName) { return filesByName.get(toPath(fileName)); });
@@ -79740,8 +82178,8 @@ var ts;
             }
         }
         /** This has side effects through `findSourceFile`. */
-        function processSourceFile(fileName, isDefaultLib, packageId, refFile, refPos, refEnd) {
-            getSourceFileFromReferenceWorker(fileName, function (fileName) { return findSourceFile(fileName, toPath(fileName), isDefaultLib, refFile, refPos, refEnd, packageId); }, // TODO: GH#18217
+        function processSourceFile(fileName, isDefaultLib, ignoreNoDefaultLib, packageId, refFile, refPos, refEnd) {
+            getSourceFileFromReferenceWorker(fileName, function (fileName) { return findSourceFile(fileName, toPath(fileName), isDefaultLib, ignoreNoDefaultLib, refFile, refPos, refEnd, packageId); }, // TODO: GH#18217
             function (diagnostic) {
                 var args = [];
                 for (var _i = 1; _i < arguments.length; _i++) {
@@ -79777,33 +82215,34 @@ var ts;
             return redirect;
         }
         // Get source file from normalized fileName
-        function findSourceFile(fileName, path, isDefaultLib, refFile, refPos, refEnd, packageId) {
+        function findSourceFile(fileName, path, isDefaultLib, ignoreNoDefaultLib, refFile, refPos, refEnd, packageId) {
             if (filesByName.has(path)) {
-                var file_10 = filesByName.get(path);
+                var file_1 = filesByName.get(path);
                 // try to check if we've already seen this file but with a different casing in path
                 // NOTE: this only makes sense for case-insensitive file systems
-                if (file_10 && options.forceConsistentCasingInFileNames && ts.getNormalizedAbsolutePath(file_10.fileName, currentDirectory) !== ts.getNormalizedAbsolutePath(fileName, currentDirectory)) {
-                    reportFileNamesDifferOnlyInCasingError(fileName, file_10.fileName, refFile, refPos, refEnd);
+                if (file_1 && options.forceConsistentCasingInFileNames && ts.getNormalizedAbsolutePath(file_1.fileName, currentDirectory) !== ts.getNormalizedAbsolutePath(fileName, currentDirectory)) {
+                    reportFileNamesDifferOnlyInCasingError(fileName, file_1.fileName, refFile, refPos, refEnd);
                 }
                 // If the file was previously found via a node_modules search, but is now being processed as a root file,
                 // then everything it sucks in may also be marked incorrectly, and needs to be checked again.
-                if (file_10 && sourceFilesFoundSearchingNodeModules.get(file_10.path) && currentNodeModulesDepth === 0) {
-                    sourceFilesFoundSearchingNodeModules.set(file_10.path, false);
+                if (file_1 && sourceFilesFoundSearchingNodeModules.get(file_1.path) && currentNodeModulesDepth === 0) {
+                    sourceFilesFoundSearchingNodeModules.set(file_1.path, false);
                     if (!options.noResolve) {
-                        processReferencedFiles(file_10, isDefaultLib);
-                        processTypeReferenceDirectives(file_10);
+                        processReferencedFiles(file_1, isDefaultLib);
+                        processTypeReferenceDirectives(file_1);
                     }
-                    modulesWithElidedImports.set(file_10.path, false);
-                    processImportedModules(file_10);
+                    processLibReferenceDirectives(file_1);
+                    modulesWithElidedImports.set(file_1.path, false);
+                    processImportedModules(file_1);
                 }
                 // See if we need to reprocess the imports due to prior skipped imports
-                else if (file_10 && modulesWithElidedImports.get(file_10.path)) {
+                else if (file_1 && modulesWithElidedImports.get(file_1.path)) {
                     if (currentNodeModulesDepth < maxNodeModuleJsDepth) {
-                        modulesWithElidedImports.set(file_10.path, false);
-                        processImportedModules(file_10);
+                        modulesWithElidedImports.set(file_1.path, false);
+                        processImportedModules(file_1);
                     }
                 }
-                return file_10;
+                return file_1;
             }
             var redirectedPath;
             if (refFile) {
@@ -79838,7 +82277,7 @@ var ts;
                     redirectTargetsSet.set(fileFromPackageId.path, true);
                     filesByName.set(path, dupFile);
                     sourceFileToPackageName.set(path, packageId.name);
-                    files.push(dupFile);
+                    processingOtherFiles.push(dupFile);
                     return dupFile;
                 }
                 else if (file) {
@@ -79854,6 +82293,7 @@ var ts;
             if (file) {
                 sourceFilesFoundSearchingNodeModules.set(path, currentNodeModulesDepth > 0);
                 file.path = path;
+                file.resolvedPath = toPath(fileName);
                 if (host.useCaseSensitiveFileNames()) {
                     var pathLowerCase = path.toLowerCase();
                     // for case-sensitive file systems check if we've already seen some file with similar filename ignoring case
@@ -79865,18 +82305,19 @@ var ts;
                         filesByNameIgnoreCase.set(pathLowerCase, file);
                     }
                 }
-                skipDefaultLib = skipDefaultLib || file.hasNoDefaultLib;
+                skipDefaultLib = skipDefaultLib || (file.hasNoDefaultLib && !ignoreNoDefaultLib);
                 if (!options.noResolve) {
                     processReferencedFiles(file, isDefaultLib);
                     processTypeReferenceDirectives(file);
                 }
+                processLibReferenceDirectives(file);
                 // always process imported modules to record module name resolutions
                 processImportedModules(file);
                 if (isDefaultLib) {
-                    files.unshift(file);
+                    processingDefaultLibFiles.push(file);
                 }
                 else {
-                    files.push(file);
+                    processingOtherFiles.push(file);
                 }
             }
             return file;
@@ -79900,7 +82341,7 @@ var ts;
         function processReferencedFiles(file, isDefaultLib) {
             ts.forEach(file.referencedFiles, function (ref) {
                 var referencedFileName = resolveTripleslashReference(ref.fileName, file.fileName);
-                processSourceFile(referencedFileName, isDefaultLib, /*packageId*/ undefined, file, ref.pos, ref.end);
+                processSourceFile(referencedFileName, isDefaultLib, /*ignoreNoDefaultLib*/ false, /*packageId*/ undefined, file, ref.pos, ref.end);
             });
         }
         function processTypeReferenceDirectives(file) {
@@ -79929,7 +82370,7 @@ var ts;
             if (resolvedTypeReferenceDirective) {
                 if (resolvedTypeReferenceDirective.primary) {
                     // resolved from the primary path
-                    processSourceFile(resolvedTypeReferenceDirective.resolvedFileName, /*isDefaultLib*/ false, resolvedTypeReferenceDirective.packageId, refFile, refPos, refEnd); // TODO: GH#18217
+                    processSourceFile(resolvedTypeReferenceDirective.resolvedFileName, /*isDefaultLib*/ false, /*ignoreNoDefaultLib*/ false, resolvedTypeReferenceDirective.packageId, refFile, refPos, refEnd); // TODO: GH#18217
                 }
                 else {
                     // If we already resolved to this file, it must have been a secondary reference. Check file contents
@@ -79948,7 +82389,7 @@ var ts;
                     }
                     else {
                         // First resolution of this library
-                        processSourceFile(resolvedTypeReferenceDirective.resolvedFileName, /*isDefaultLib*/ false, resolvedTypeReferenceDirective.packageId, refFile, refPos, refEnd);
+                        processSourceFile(resolvedTypeReferenceDirective.resolvedFileName, /*isDefaultLib*/ false, /*ignoreNoDefaultLib*/ false, resolvedTypeReferenceDirective.packageId, refFile, refPos, refEnd);
                     }
                 }
             }
@@ -79959,6 +82400,22 @@ var ts;
                 resolvedTypeReferenceDirectives.set(typeReferenceDirective, resolvedTypeReferenceDirective);
             }
         }
+        function processLibReferenceDirectives(file) {
+            ts.forEach(file.libReferenceDirectives, function (libReference) {
+                var libName = libReference.fileName.toLocaleLowerCase();
+                var libFileName = ts.libMap.get(libName);
+                if (libFileName) {
+                    // we ignore any 'no-default-lib' reference set on this file.
+                    processRootFile(ts.combinePaths(defaultLibraryPath, libFileName), /*isDefaultLib*/ true, /*ignoreNoDefaultLib*/ true);
+                }
+                else {
+                    var unqualifiedLibName = ts.removeSuffix(ts.removePrefix(libName, "lib."), ".d.ts");
+                    var suggestion = ts.getSpellingSuggestion(unqualifiedLibName, ts.libs, ts.identity);
+                    var message = suggestion ? ts.Diagnostics.Cannot_find_lib_definition_for_0_Did_you_mean_1 : ts.Diagnostics.Cannot_find_lib_definition_for_0;
+                    fileProcessingDiagnostics.add(createDiagnostic(file, libReference.pos, libReference.end, message, libName, suggestion));
+                }
+            });
+        }
         function createDiagnostic(refFile, refPos, refEnd, message) {
             var args = [];
             for (var _i = 4; _i < arguments.length; _i++) {
@@ -80016,7 +82473,7 @@ var ts;
                     else if (shouldAddFile) {
                         var path = toPath(resolvedFileName);
                         var pos = ts.skipTrivia(file.text, file.imports[i].pos);
-                        findSourceFile(resolvedFileName, path, /*isDefaultLib*/ false, file, pos, file.imports[i].end, resolution.packageId);
+                        findSourceFile(resolvedFileName, path, /*isDefaultLib*/ false, /*ignoreNoDefaultLib*/ false, file, pos, file.imports[i].end, resolution.packageId);
                     }
                     if (isFromNodeModulesSearch) {
                         currentNodeModulesDepth--;
@@ -80031,9 +82488,9 @@ var ts;
         function computeCommonSourceDirectory(sourceFiles) {
             var fileNames = [];
             for (var _i = 0, sourceFiles_2 = sourceFiles; _i < sourceFiles_2.length; _i++) {
-                var file_11 = sourceFiles_2[_i];
-                if (!file_11.isDeclarationFile) {
-                    fileNames.push(file_11.fileName);
+                var file = sourceFiles_2[_i];
+                if (!file.isDeclarationFile) {
+                    fileNames.push(file.fileName);
                 }
             }
             return computeCommonSourceDirectoryOfFilenames(fileNames, currentDirectory, getCanonicalFileName);
@@ -80137,14 +82594,14 @@ var ts;
             if (options.composite && rootNames.length < files.length) {
                 var normalizedRootNames = rootNames.map(function (r) { return ts.normalizePath(r).toLowerCase(); });
                 var sourceFiles = files.filter(function (f) { return !f.isDeclarationFile; }).map(function (f) { return ts.normalizePath(f.path).toLowerCase(); });
-                var _loop_10 = function (file_12) {
-                    if (normalizedRootNames.every(function (r) { return r !== file_12; })) {
-                        programDiagnostics.add(ts.createCompilerDiagnostic(ts.Diagnostics.File_0_is_not_in_project_file_list_Projects_must_list_all_files_or_use_an_include_pattern, file_12));
+                var _loop_8 = function (file) {
+                    if (normalizedRootNames.every(function (r) { return r !== file; })) {
+                        programDiagnostics.add(ts.createCompilerDiagnostic(ts.Diagnostics.File_0_is_not_in_project_file_list_Projects_must_list_all_files_or_use_an_include_pattern, file));
                     }
                 };
                 for (var _i = 0, sourceFiles_4 = sourceFiles; _i < sourceFiles_4.length; _i++) {
-                    var file_12 = sourceFiles_4[_i];
-                    _loop_10(file_12);
+                    var file = sourceFiles_4[_i];
+                    _loop_8(file);
                 }
             }
             if (options.paths) {
@@ -80496,6 +82953,7 @@ var ts;
         }
         return ref.path;
     }
+    ts.resolveProjectReferencePath = resolveProjectReferencePath;
     /* @internal */
     /**
      * Returns a DiagnosticMessage if we won't include a resolved module due to its extension.
@@ -81446,8 +83904,29 @@ var ts;
         function isNodeModulesAtTypesDirectory(dirPath) {
             return ts.endsWith(dirPath, "/node_modules/@types");
         }
-        function isDirectoryAtleastAtLevelFromFSRoot(dirPath, minLevels) {
-            for (var searchIndex = ts.getRootLength(dirPath); minLevels > 0; minLevels--) {
+        /**
+         * Filter out paths like
+         * "/", "/user", "/user/username", "/user/username/folderAtRoot",
+         * "c:/", "c:/users", "c:/users/username", "c:/users/username/folderAtRoot", "c:/folderAtRoot"
+         * @param dirPath
+         */
+        function canWatchDirectory(dirPath) {
+            var rootLength = ts.getRootLength(dirPath);
+            if (dirPath.length === rootLength) {
+                // Ignore "/", "c:/"
+                return false;
+            }
+            var nextDirectorySeparator = dirPath.indexOf(ts.directorySeparator, rootLength);
+            if (nextDirectorySeparator === -1) {
+                // ignore "/user", "c:/users" or "c:/folderAtRoot"
+                return false;
+            }
+            if (dirPath.charCodeAt(0) !== 47 /* slash */ &&
+                dirPath.substr(rootLength, nextDirectorySeparator).search(/users/i) === -1) {
+                // Paths like c:/folderAtRoot/subFolder are allowed
+                return true;
+            }
+            for (var searchIndex = nextDirectorySeparator + 1, searchLevels = 2; searchLevels > 0; searchLevels--) {
                 searchIndex = dirPath.indexOf(ts.directorySeparator, searchIndex) + 1;
                 if (searchIndex === 0) {
                     // Folder isnt at expected minimun levels
@@ -81456,14 +83935,6 @@ var ts;
             }
             return true;
         }
-        function canWatchDirectory(dirPath) {
-            return isDirectoryAtleastAtLevelFromFSRoot(dirPath, 
-            // When root is "/" do not watch directories like:
-            // "/", "/user", "/user/username", "/user/username/folderAtRoot"
-            // When root is "c:/" do not watch directories like:
-            // "c:/", "c:/folderAtRoot"
-            dirPath.charCodeAt(0) === 47 /* slash */ ? 3 : 1);
-        }
         function filterFSRootDirectoriesToWatch(watchPath, dirPath) {
             if (!canWatchDirectory(dirPath)) {
                 watchPath.ignore = true;
@@ -81773,6 +84244,315 @@ var ts;
     }
     ts.createResolutionCache = createResolutionCache;
 })(ts || (ts = {}));
+// Used by importFixes to synthesize import module specifiers.
+/* @internal */
+var ts;
+(function (ts) {
+    var moduleSpecifiers;
+    (function (moduleSpecifiers) {
+        // Note: fromSourceFile is just for usesJsExtensionOnImports
+        function getModuleSpecifier(compilerOptions, fromSourceFile, fromSourceFileName, toFileName, host, preferences) {
+            if (preferences === void 0) { preferences = {}; }
+            var info = getInfo(compilerOptions, fromSourceFile, fromSourceFileName, host);
+            return getGlobalModuleSpecifier(toFileName, info, host, compilerOptions) ||
+                ts.first(getLocalModuleSpecifiers(toFileName, info, compilerOptions, preferences));
+        }
+        moduleSpecifiers.getModuleSpecifier = getModuleSpecifier;
+        // For each symlink/original for a module, returns a list of ways to import that file.
+        function getModuleSpecifiers(moduleSymbol, program, importingSourceFile, host, preferences) {
+            var ambient = tryGetModuleNameFromAmbientModule(moduleSymbol);
+            if (ambient)
+                return [[ambient]];
+            var compilerOptions = program.getCompilerOptions();
+            var info = getInfo(compilerOptions, importingSourceFile, importingSourceFile.fileName, host);
+            var modulePaths = getAllModulePaths(program, ts.getSourceFileOfNode(moduleSymbol.valueDeclaration));
+            var global = ts.mapDefined(modulePaths, function (moduleFileName) { return getGlobalModuleSpecifier(moduleFileName, info, host, compilerOptions); });
+            return global.length ? global.map(function (g) { return [g]; }) : modulePaths.map(function (moduleFileName) {
+                return getLocalModuleSpecifiers(moduleFileName, info, compilerOptions, preferences);
+            });
+        }
+        moduleSpecifiers.getModuleSpecifiers = getModuleSpecifiers;
+        // importingSourceFileName is separate because getEditsForFileRename may need to specify an updated path
+        function getInfo(compilerOptions, importingSourceFile, importingSourceFileName, host) {
+            var moduleResolutionKind = ts.getEmitModuleResolutionKind(compilerOptions);
+            var addJsExtension = usesJsExtensionOnImports(importingSourceFile);
+            var getCanonicalFileName = ts.createGetCanonicalFileName(host.useCaseSensitiveFileNames ? host.useCaseSensitiveFileNames() : true);
+            var sourceDirectory = ts.getDirectoryPath(importingSourceFileName);
+            return { moduleResolutionKind: moduleResolutionKind, addJsExtension: addJsExtension, getCanonicalFileName: getCanonicalFileName, sourceDirectory: sourceDirectory };
+        }
+        function getGlobalModuleSpecifier(moduleFileName, _a, host, compilerOptions) {
+            var addJsExtension = _a.addJsExtension, getCanonicalFileName = _a.getCanonicalFileName, sourceDirectory = _a.sourceDirectory;
+            return tryGetModuleNameFromTypeRoots(compilerOptions, host, getCanonicalFileName, moduleFileName, addJsExtension)
+                || tryGetModuleNameAsNodeModule(compilerOptions, moduleFileName, host, getCanonicalFileName, sourceDirectory)
+                || compilerOptions.rootDirs && tryGetModuleNameFromRootDirs(compilerOptions.rootDirs, moduleFileName, sourceDirectory, getCanonicalFileName);
+        }
+        function getLocalModuleSpecifiers(moduleFileName, _a, compilerOptions, preferences) {
+            var moduleResolutionKind = _a.moduleResolutionKind, addJsExtension = _a.addJsExtension, getCanonicalFileName = _a.getCanonicalFileName, sourceDirectory = _a.sourceDirectory;
+            var baseUrl = compilerOptions.baseUrl, paths = compilerOptions.paths;
+            var relativePath = removeExtensionAndIndexPostFix(ts.ensurePathIsNonModuleName(ts.getRelativePathFromDirectory(sourceDirectory, moduleFileName, getCanonicalFileName)), moduleResolutionKind, addJsExtension);
+            if (!baseUrl || preferences.importModuleSpecifierPreference === "relative") {
+                return [relativePath];
+            }
+            var relativeToBaseUrl = getRelativePathIfInDirectory(moduleFileName, baseUrl, getCanonicalFileName);
+            if (!relativeToBaseUrl) {
+                return [relativePath];
+            }
+            var importRelativeToBaseUrl = removeExtensionAndIndexPostFix(relativeToBaseUrl, moduleResolutionKind, addJsExtension);
+            if (paths) {
+                var fromPaths = tryGetModuleNameFromPaths(ts.removeFileExtension(relativeToBaseUrl), importRelativeToBaseUrl, paths);
+                if (fromPaths) {
+                    return [fromPaths];
+                }
+            }
+            if (preferences.importModuleSpecifierPreference === "non-relative") {
+                return [importRelativeToBaseUrl];
+            }
+            if (preferences.importModuleSpecifierPreference !== undefined)
+                ts.Debug.assertNever(preferences.importModuleSpecifierPreference);
+            if (isPathRelativeToParent(relativeToBaseUrl)) {
+                return [relativePath];
+            }
+            /*
+            Prefer a relative import over a baseUrl import if it doesn't traverse up to baseUrl.
+    
+            Suppose we have:
+                baseUrl = /base
+                sourceDirectory = /base/a/b
+                moduleFileName = /base/foo/bar
+            Then:
+                relativePath = ../../foo/bar
+                getRelativePathNParents(relativePath) = 2
+                pathFromSourceToBaseUrl = ../../
+                getRelativePathNParents(pathFromSourceToBaseUrl) = 2
+                2 < 2 = false
+            In this case we should prefer using the baseUrl path "/a/b" instead of the relative path "../../foo/bar".
+    
+            Suppose we have:
+                baseUrl = /base
+                sourceDirectory = /base/foo/a
+                moduleFileName = /base/foo/bar
+            Then:
+                relativePath = ../a
+                getRelativePathNParents(relativePath) = 1
+                pathFromSourceToBaseUrl = ../../
+                getRelativePathNParents(pathFromSourceToBaseUrl) = 2
+                1 < 2 = true
+            In this case we should prefer using the relative path "../a" instead of the baseUrl path "foo/a".
+            */
+            var pathFromSourceToBaseUrl = ts.ensurePathIsNonModuleName(ts.getRelativePathFromDirectory(sourceDirectory, baseUrl, getCanonicalFileName));
+            var relativeFirst = getRelativePathNParents(relativePath) < getRelativePathNParents(pathFromSourceToBaseUrl);
+            return relativeFirst ? [relativePath, importRelativeToBaseUrl] : [importRelativeToBaseUrl, relativePath];
+        }
+        function usesJsExtensionOnImports(_a) {
+            var imports = _a.imports;
+            return ts.firstDefined(imports, function (_a) {
+                var text = _a.text;
+                return ts.pathIsRelative(text) ? ts.fileExtensionIs(text, ".js" /* Js */) : undefined;
+            }) || false;
+        }
+        /**
+         * Looks for a existing imports that use symlinks to this module.
+         * Only if no symlink is available, the real path will be used.
+         */
+        function getAllModulePaths(program, _a) {
+            var fileName = _a.fileName;
+            var symlinks = ts.mapDefined(program.getSourceFiles(), function (sf) {
+                return sf.resolvedModules && ts.firstDefinedIterator(sf.resolvedModules.values(), function (res) {
+                    return res && res.resolvedFileName === fileName ? res.originalPath : undefined;
+                });
+            });
+            return symlinks.length === 0 ? [fileName] : symlinks;
+        }
+        function getRelativePathNParents(relativePath) {
+            var components = ts.getPathComponents(relativePath);
+            if (components[0] || components.length === 1)
+                return 0;
+            for (var i = 1; i < components.length; i++) {
+                if (components[i] !== "..")
+                    return i - 1;
+            }
+            return components.length - 1;
+        }
+        function tryGetModuleNameFromAmbientModule(moduleSymbol) {
+            var decl = moduleSymbol.valueDeclaration;
+            if (ts.isModuleDeclaration(decl) && ts.isStringLiteral(decl.name)) {
+                return decl.name.text;
+            }
+        }
+        function tryGetModuleNameFromPaths(relativeToBaseUrlWithIndex, relativeToBaseUrl, paths) {
+            for (var key in paths) {
+                for (var _i = 0, _a = paths[key]; _i < _a.length; _i++) {
+                    var patternText_1 = _a[_i];
+                    var pattern = ts.removeFileExtension(ts.normalizePath(patternText_1));
+                    var indexOfStar = pattern.indexOf("*");
+                    if (indexOfStar === 0 && pattern.length === 1) {
+                        continue;
+                    }
+                    else if (indexOfStar !== -1) {
+                        var prefix = pattern.substr(0, indexOfStar);
+                        var suffix = pattern.substr(indexOfStar + 1);
+                        if (relativeToBaseUrl.length >= prefix.length + suffix.length &&
+                            ts.startsWith(relativeToBaseUrl, prefix) &&
+                            ts.endsWith(relativeToBaseUrl, suffix)) {
+                            var matchedStar = relativeToBaseUrl.substr(prefix.length, relativeToBaseUrl.length - suffix.length);
+                            return key.replace("*", matchedStar);
+                        }
+                    }
+                    else if (pattern === relativeToBaseUrl || pattern === relativeToBaseUrlWithIndex) {
+                        return key;
+                    }
+                }
+            }
+        }
+        function tryGetModuleNameFromRootDirs(rootDirs, moduleFileName, sourceDirectory, getCanonicalFileName) {
+            var normalizedTargetPath = getPathRelativeToRootDirs(moduleFileName, rootDirs, getCanonicalFileName);
+            if (normalizedTargetPath === undefined) {
+                return undefined;
+            }
+            var normalizedSourcePath = getPathRelativeToRootDirs(sourceDirectory, rootDirs, getCanonicalFileName);
+            var relativePath = normalizedSourcePath !== undefined ? ts.ensurePathIsNonModuleName(ts.getRelativePathFromDirectory(normalizedSourcePath, normalizedTargetPath, getCanonicalFileName)) : normalizedTargetPath;
+            return ts.removeFileExtension(relativePath);
+        }
+        function tryGetModuleNameFromTypeRoots(options, host, getCanonicalFileName, moduleFileName, addJsExtension) {
+            var roots = ts.getEffectiveTypeRoots(options, host);
+            return ts.firstDefined(roots, function (unNormalizedTypeRoot) {
+                var typeRoot = ts.toPath(unNormalizedTypeRoot, /*basePath*/ undefined, getCanonicalFileName);
+                if (ts.startsWith(moduleFileName, typeRoot)) {
+                    // For a type definition, we can strip `/index` even with classic resolution.
+                    return removeExtensionAndIndexPostFix(moduleFileName.substring(typeRoot.length + 1), ts.ModuleResolutionKind.NodeJs, addJsExtension);
+                }
+            });
+        }
+        function tryGetModuleNameAsNodeModule(options, moduleFileName, host, getCanonicalFileName, sourceDirectory) {
+            if (ts.getEmitModuleResolutionKind(options) !== ts.ModuleResolutionKind.NodeJs) {
+                // nothing to do here
+                return undefined;
+            }
+            var parts = getNodeModulePathParts(moduleFileName);
+            if (!parts) {
+                return undefined;
+            }
+            // Simplify the full file path to something that can be resolved by Node.
+            // If the module could be imported by a directory name, use that directory's name
+            var moduleSpecifier = getDirectoryOrExtensionlessFileName(moduleFileName);
+            // Get a path that's relative to node_modules or the importing file's path
+            // if node_modules folder is in this folder or any of its parent folders, no need to keep it.
+            if (!ts.startsWith(sourceDirectory, moduleSpecifier.substring(0, parts.topLevelNodeModulesIndex)))
+                return undefined;
+            // If the module was found in @types, get the actual Node package name
+            return ts.getPackageNameFromAtTypesDirectory(moduleSpecifier.substring(parts.topLevelPackageNameIndex + 1));
+            function getDirectoryOrExtensionlessFileName(path) {
+                // If the file is the main module, it can be imported by the package name
+                var packageRootPath = path.substring(0, parts.packageRootIndex);
+                var packageJsonPath = ts.combinePaths(packageRootPath, "package.json");
+                if (host.fileExists(packageJsonPath)) { // TODO: GH#18217
+                    var packageJsonContent = JSON.parse(host.readFile(packageJsonPath));
+                    if (packageJsonContent) {
+                        var mainFileRelative = packageJsonContent.typings || packageJsonContent.types || packageJsonContent.main;
+                        if (mainFileRelative) {
+                            var mainExportFile = ts.toPath(mainFileRelative, packageRootPath, getCanonicalFileName);
+                            if (ts.removeFileExtension(mainExportFile) === ts.removeFileExtension(getCanonicalFileName(path))) {
+                                return packageRootPath;
+                            }
+                        }
+                    }
+                }
+                // We still have a file name - remove the extension
+                var fullModulePathWithoutExtension = ts.removeFileExtension(path);
+                // If the file is /index, it can be imported by its directory name
+                // IFF there is not _also_ a file by the same name
+                if (getCanonicalFileName(fullModulePathWithoutExtension.substring(parts.fileNameIndex)) === "/index" && !tryGetAnyFileFromPath(host, fullModulePathWithoutExtension.substring(0, parts.fileNameIndex))) {
+                    return fullModulePathWithoutExtension.substring(0, parts.fileNameIndex);
+                }
+                return fullModulePathWithoutExtension;
+            }
+        }
+        function tryGetAnyFileFromPath(host, path) {
+            // We check all js, `node` and `json` extensions in addition to TS, since node module resolution would also choose those over the directory
+            var extensions = ts.getSupportedExtensions({ allowJs: true }, [{ extension: "node", isMixedContent: false }, { extension: "json", isMixedContent: false, scriptKind: 6 /* JSON */ }]);
+            for (var _i = 0, extensions_1 = extensions; _i < extensions_1.length; _i++) {
+                var e = extensions_1[_i];
+                var fullPath = path + e;
+                if (host.fileExists(fullPath)) { // TODO: GH#18217
+                    return fullPath;
+                }
+            }
+        }
+        function getNodeModulePathParts(fullPath) {
+            // If fullPath can't be valid module file within node_modules, returns undefined.
+            // Example of expected pattern: /base/path/node_modules/[@scope/otherpackage/@otherscope/node_modules/]package/[subdirectory/]file.js
+            // Returns indices:                       ^            ^                                                      ^             ^
+            var topLevelNodeModulesIndex = 0;
+            var topLevelPackageNameIndex = 0;
+            var packageRootIndex = 0;
+            var fileNameIndex = 0;
+            var States;
+            (function (States) {
+                States[States["BeforeNodeModules"] = 0] = "BeforeNodeModules";
+                States[States["NodeModules"] = 1] = "NodeModules";
+                States[States["Scope"] = 2] = "Scope";
+                States[States["PackageContent"] = 3] = "PackageContent";
+            })(States || (States = {}));
+            var partStart = 0;
+            var partEnd = 0;
+            var state = 0 /* BeforeNodeModules */;
+            while (partEnd >= 0) {
+                partStart = partEnd;
+                partEnd = fullPath.indexOf("/", partStart + 1);
+                switch (state) {
+                    case 0 /* BeforeNodeModules */:
+                        if (fullPath.indexOf("/node_modules/", partStart) === partStart) {
+                            topLevelNodeModulesIndex = partStart;
+                            topLevelPackageNameIndex = partEnd;
+                            state = 1 /* NodeModules */;
+                        }
+                        break;
+                    case 1 /* NodeModules */:
+                    case 2 /* Scope */:
+                        if (state === 1 /* NodeModules */ && fullPath.charAt(partStart + 1) === "@") {
+                            state = 2 /* Scope */;
+                        }
+                        else {
+                            packageRootIndex = partEnd;
+                            state = 3 /* PackageContent */;
+                        }
+                        break;
+                    case 3 /* PackageContent */:
+                        if (fullPath.indexOf("/node_modules/", partStart) === partStart) {
+                            state = 1 /* NodeModules */;
+                        }
+                        else {
+                            state = 3 /* PackageContent */;
+                        }
+                        break;
+                }
+            }
+            fileNameIndex = partStart;
+            return state > 1 /* NodeModules */ ? { topLevelNodeModulesIndex: topLevelNodeModulesIndex, topLevelPackageNameIndex: topLevelPackageNameIndex, packageRootIndex: packageRootIndex, fileNameIndex: fileNameIndex } : undefined;
+        }
+        function getPathRelativeToRootDirs(path, rootDirs, getCanonicalFileName) {
+            return ts.firstDefined(rootDirs, function (rootDir) {
+                var relativePath = getRelativePathIfInDirectory(path, rootDir, getCanonicalFileName); // TODO: GH#18217
+                return isPathRelativeToParent(relativePath) ? undefined : relativePath;
+            });
+        }
+        function removeExtensionAndIndexPostFix(fileName, moduleResolutionKind, addJsExtension) {
+            var noExtension = ts.removeFileExtension(fileName);
+            return addJsExtension
+                ? noExtension + ".js"
+                : moduleResolutionKind === ts.ModuleResolutionKind.NodeJs
+                    ? ts.removeSuffix(noExtension, "/index")
+                    : noExtension;
+        }
+        function getRelativePathIfInDirectory(path, directoryPath, getCanonicalFileName) {
+            var relativePath = ts.getRelativePathToDirectoryOrUrl(directoryPath, path, directoryPath, getCanonicalFileName, /*isAbsolutePathAnUrl*/ false);
+            return ts.isRootedDiskPath(relativePath) ? undefined : relativePath;
+        }
+        function isPathRelativeToParent(path) {
+            return ts.startsWith(path, "..");
+        }
+    })(moduleSpecifiers = ts.moduleSpecifiers || (ts.moduleSpecifiers = {}));
+})(ts || (ts = {}));
 /*@internal*/
 var ts;
 (function (ts) {
@@ -81942,11 +84722,11 @@ var ts;
             watchFile: system.watchFile ? (function (path, callback, pollingInterval) { return system.watchFile(path, callback, pollingInterval); }) : function () { return noopFileWatcher; },
             watchDirectory: system.watchDirectory ? (function (path, callback, recursive) { return system.watchDirectory(path, callback, recursive); }) : function () { return noopFileWatcher; },
             setTimeout: system.setTimeout ? (function (callback, ms) {
-                var _a;
                 var args = [];
                 for (var _i = 2; _i < arguments.length; _i++) {
                     args[_i - 2] = arguments[_i];
                 }
+                var _a;
                 return (_a = system.setTimeout).call.apply(_a, [system, callback, ms].concat(args));
             }) : ts.noop,
             clearTimeout: system.clearTimeout ? (function (timeoutId) { return system.clearTimeout(timeoutId); }) : ts.noop,
@@ -82472,2139 +85252,972 @@ var ts;
 })(ts || (ts = {}));
 var ts;
 (function (ts) {
-    /* @internal */
-    ts.compileOnSaveCommandLineOption = { name: "compileOnSave", type: "boolean" };
-    /* @internal */
-    ts.optionDeclarations = [
-        // CommandLine only options
+    var minimumDate = new Date(-8640000000000000);
+    var maximumDate = new Date(8640000000000000);
+    var BuildResultFlags;
+    (function (BuildResultFlags) {
+        BuildResultFlags[BuildResultFlags["None"] = 0] = "None";
+        /**
+         * No errors of any kind occurred during build
+         */
+        BuildResultFlags[BuildResultFlags["Success"] = 1] = "Success";
+        /**
+         * None of the .d.ts files emitted by this build were
+         * different from the existing files on disk
+         */
+        BuildResultFlags[BuildResultFlags["DeclarationOutputUnchanged"] = 2] = "DeclarationOutputUnchanged";
+        BuildResultFlags[BuildResultFlags["ConfigFileErrors"] = 4] = "ConfigFileErrors";
+        BuildResultFlags[BuildResultFlags["SyntaxErrors"] = 8] = "SyntaxErrors";
+        BuildResultFlags[BuildResultFlags["TypeErrors"] = 16] = "TypeErrors";
+        BuildResultFlags[BuildResultFlags["DeclarationEmitErrors"] = 32] = "DeclarationEmitErrors";
+        BuildResultFlags[BuildResultFlags["AnyErrors"] = 60] = "AnyErrors";
+    })(BuildResultFlags || (BuildResultFlags = {}));
+    var UpToDateStatusType;
+    (function (UpToDateStatusType) {
+        UpToDateStatusType[UpToDateStatusType["Unbuildable"] = 0] = "Unbuildable";
+        UpToDateStatusType[UpToDateStatusType["UpToDate"] = 1] = "UpToDate";
+        /**
+         * The project appears out of date because its upstream inputs are newer than its outputs,
+         * but all of its outputs are actually newer than the previous identical outputs of its (.d.ts) inputs.
+         * This means we can Pseudo-build (just touch timestamps), as if we had actually built this project.
+         */
+        UpToDateStatusType[UpToDateStatusType["UpToDateWithUpstreamTypes"] = 2] = "UpToDateWithUpstreamTypes";
+        UpToDateStatusType[UpToDateStatusType["OutputMissing"] = 3] = "OutputMissing";
+        UpToDateStatusType[UpToDateStatusType["OutOfDateWithSelf"] = 4] = "OutOfDateWithSelf";
+        UpToDateStatusType[UpToDateStatusType["OutOfDateWithUpstream"] = 5] = "OutOfDateWithUpstream";
+        UpToDateStatusType[UpToDateStatusType["UpstreamOutOfDate"] = 6] = "UpstreamOutOfDate";
+        UpToDateStatusType[UpToDateStatusType["UpstreamBlocked"] = 7] = "UpstreamBlocked";
+        /**
+         * Projects with no outputs (i.e. "solution" files)
+         */
+        UpToDateStatusType[UpToDateStatusType["ContainerOnly"] = 8] = "ContainerOnly";
+    })(UpToDateStatusType = ts.UpToDateStatusType || (ts.UpToDateStatusType = {}));
+    /**
+     * A FileMap maintains a normalized-key to value relationship
+     */
+    function createFileMap() {
+        // tslint:disable-next-line:no-null-keyword
+        var lookup = ts.createMap();
+        return {
+            setValue: setValue,
+            getValue: getValue,
+            getValueOrUndefined: getValueOrUndefined,
+            removeKey: removeKey,
+            getKeys: getKeys,
+            hasKey: hasKey
+        };
+        function getKeys() {
+            return Object.keys(lookup);
+        }
+        function hasKey(fileName) {
+            return lookup.has(ts.normalizePath(fileName));
+        }
+        function removeKey(fileName) {
+            lookup.delete(ts.normalizePath(fileName));
+        }
+        function setValue(fileName, value) {
+            lookup.set(ts.normalizePath(fileName), value);
+        }
+        function getValue(fileName) {
+            var f = ts.normalizePath(fileName);
+            if (lookup.has(f)) {
+                return lookup.get(f);
+            }
+            else {
+                throw new Error("No value corresponding to " + fileName + " exists in this map");
+            }
+        }
+        function getValueOrUndefined(fileName) {
+            var f = ts.normalizePath(fileName);
+            return lookup.get(f);
+        }
+    }
+    function createDependencyMapper() {
+        var childToParents = createFileMap();
+        var parentToChildren = createFileMap();
+        var allKeys = createFileMap();
+        function addReference(childConfigFileName, parentConfigFileName) {
+            addEntry(childToParents, childConfigFileName, parentConfigFileName);
+            addEntry(parentToChildren, parentConfigFileName, childConfigFileName);
+        }
+        function getReferencesTo(parentConfigFileName) {
+            return parentToChildren.getValueOrUndefined(parentConfigFileName) || [];
+        }
+        function getReferencesOf(childConfigFileName) {
+            return childToParents.getValueOrUndefined(childConfigFileName) || [];
+        }
+        function getKeys() {
+            return allKeys.getKeys();
+        }
+        function addEntry(mapToAddTo, key, element) {
+            key = ts.normalizePath(key);
+            element = ts.normalizePath(element);
+            var arr = mapToAddTo.getValueOrUndefined(key);
+            if (arr === undefined) {
+                mapToAddTo.setValue(key, arr = []);
+            }
+            if (arr.indexOf(element) < 0) {
+                arr.push(element);
+            }
+            allKeys.setValue(key, true);
+            allKeys.setValue(element, true);
+        }
+        return {
+            addReference: addReference,
+            getReferencesTo: getReferencesTo,
+            getReferencesOf: getReferencesOf,
+            getKeys: getKeys
+        };
+    }
+    ts.createDependencyMapper = createDependencyMapper;
+    function getOutputDeclarationFileName(inputFileName, configFile) {
+        var relativePath = ts.getRelativePathFromDirectory(rootDirOfOptions(configFile.options, configFile.options.configFilePath), inputFileName, /*ignoreCase*/ true);
+        var outputPath = ts.resolvePath(configFile.options.declarationDir || configFile.options.outDir || ts.getDirectoryPath(configFile.options.configFilePath), relativePath);
+        return ts.changeExtension(outputPath, ".d.ts" /* Dts */);
+    }
+    function getOutputJavaScriptFileName(inputFileName, configFile) {
+        var relativePath = ts.getRelativePathFromDirectory(rootDirOfOptions(configFile.options, configFile.options.configFilePath), inputFileName, /*ignoreCase*/ true);
+        var outputPath = ts.resolvePath(configFile.options.outDir || ts.getDirectoryPath(configFile.options.configFilePath), relativePath);
+        return ts.changeExtension(outputPath, (ts.fileExtensionIs(inputFileName, ".tsx" /* Tsx */) && configFile.options.jsx === 1 /* Preserve */) ? ".jsx" /* Jsx */ : ".js" /* Js */);
+    }
+    function getOutputFileNames(inputFileName, configFile) {
+        if (configFile.options.outFile) {
+            return ts.emptyArray;
+        }
+        var outputs = [];
+        outputs.push(getOutputJavaScriptFileName(inputFileName, configFile));
+        if (configFile.options.declaration) {
+            var dts = outputs.push(getOutputDeclarationFileName(inputFileName, configFile));
+            if (configFile.options.declarationMap) {
+                outputs.push(dts + ".map");
+            }
+        }
+        return outputs;
+    }
+    function getOutFileOutputs(project) {
+        if (!project.options.outFile) {
+            return ts.Debug.fail("outFile must be set");
+        }
+        var outputs = [];
+        outputs.push(project.options.outFile);
+        if (project.options.declaration) {
+            var dts = ts.changeExtension(project.options.outFile, ".d.ts" /* Dts */);
+            outputs.push(dts);
+            if (project.options.declarationMap) {
+                outputs.push(dts + ".map");
+            }
+        }
+        return outputs;
+    }
+    function rootDirOfOptions(opts, configFileName) {
+        return opts.rootDir || ts.getDirectoryPath(configFileName);
+    }
+    function createConfigFileCache(host) {
+        var cache = createFileMap();
+        var configParseHost = ts.parseConfigHostFromCompilerHost(host);
+        function parseConfigFile(configFilePath) {
+            var sourceFile = host.getSourceFile(configFilePath, 100 /* JSON */);
+            if (sourceFile === undefined) {
+                return undefined;
+            }
+            var parsed = ts.parseJsonSourceFileConfigFileContent(sourceFile, configParseHost, ts.getDirectoryPath(configFilePath));
+            parsed.options.configFilePath = configFilePath;
+            cache.setValue(configFilePath, parsed);
+            return parsed;
+        }
+        function removeKey(configFilePath) {
+            cache.removeKey(configFilePath);
+        }
+        return {
+            parseConfigFile: parseConfigFile,
+            removeKey: removeKey
+        };
+    }
+    function newer(date1, date2) {
+        return date2 > date1 ? date2 : date1;
+    }
+    function isDeclarationFile(fileName) {
+        return ts.fileExtensionIs(fileName, ".d.ts" /* Dts */);
+    }
+    function createBuildContext(options) {
+        var invalidatedProjects = createFileMap();
+        var queuedProjects = createFileMap();
+        var missingRoots = ts.createMap();
+        return {
+            options: options,
+            projectStatus: createFileMap(),
+            unchangedOutputs: createFileMap(),
+            invalidatedProjects: invalidatedProjects,
+            missingRoots: missingRoots,
+            queuedProjects: queuedProjects
+        };
+    }
+    ts.createBuildContext = createBuildContext;
+    var buildOpts = [
         {
-            name: "help",
-            shortName: "h",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
+            name: "verbose",
+            shortName: "v",
             category: ts.Diagnostics.Command_line_Options,
-            description: ts.Diagnostics.Print_this_message,
-        },
-        {
-            name: "help",
-            shortName: "?",
+            description: ts.Diagnostics.Enable_verbose_logging,
             type: "boolean"
         },
         {
-            name: "all",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
+            name: "dry",
+            shortName: "d",
             category: ts.Diagnostics.Command_line_Options,
-            description: ts.Diagnostics.Show_all_compiler_options,
+            description: ts.Diagnostics.Show_what_would_be_built_or_deleted_if_specified_with_clean,
+            type: "boolean"
         },
         {
-            name: "version",
-            shortName: "v",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
+            name: "force",
+            shortName: "f",
             category: ts.Diagnostics.Command_line_Options,
-            description: ts.Diagnostics.Print_the_compiler_s_version,
+            description: ts.Diagnostics.Build_all_projects_including_those_that_appear_to_be_up_to_date,
+            type: "boolean"
         },
         {
-            name: "init",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
+            name: "clean",
             category: ts.Diagnostics.Command_line_Options,
-            description: ts.Diagnostics.Initializes_a_TypeScript_project_and_creates_a_tsconfig_json_file,
-        },
-        {
-            name: "project",
-            shortName: "p",
-            type: "string",
-            isFilePath: true,
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Command_line_Options,
-            paramType: ts.Diagnostics.FILE_OR_DIRECTORY,
-            description: ts.Diagnostics.Compile_the_project_given_the_path_to_its_configuration_file_or_to_a_folder_with_a_tsconfig_json,
-        },
-        {
-            name: "pretty",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Command_line_Options,
-            description: ts.Diagnostics.Stylize_errors_and_messages_using_color_and_context_experimental
-        },
-        {
-            name: "preserveWatchOutput",
-            type: "boolean",
-            showInSimplifiedHelpView: false,
-            category: ts.Diagnostics.Command_line_Options,
-            description: ts.Diagnostics.Whether_to_keep_outdated_console_output_in_watch_mode_instead_of_clearing_the_screen,
+            description: ts.Diagnostics.Delete_the_outputs_of_all_projects,
+            type: "boolean"
         },
         {
             name: "watch",
-            shortName: "w",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
             category: ts.Diagnostics.Command_line_Options,
             description: ts.Diagnostics.Watch_input_files,
-        },
-        // Basic
-        {
-            name: "target",
-            shortName: "t",
-            type: ts.createMapFromTemplate({
-                es3: 0 /* ES3 */,
-                es5: 1 /* ES5 */,
-                es6: 2 /* ES2015 */,
-                es2015: 2 /* ES2015 */,
-                es2016: 3 /* ES2016 */,
-                es2017: 4 /* ES2017 */,
-                es2018: 5 /* ES2018 */,
-                esnext: 6 /* ESNext */,
-            }),
-            paramType: ts.Diagnostics.VERSION,
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Specify_ECMAScript_target_version_Colon_ES3_default_ES5_ES2015_ES2016_ES2017_ES2018_or_ESNEXT,
-        },
-        {
-            name: "module",
-            shortName: "m",
-            type: ts.createMapFromTemplate({
-                none: ts.ModuleKind.None,
-                commonjs: ts.ModuleKind.CommonJS,
-                amd: ts.ModuleKind.AMD,
-                system: ts.ModuleKind.System,
-                umd: ts.ModuleKind.UMD,
-                es6: ts.ModuleKind.ES2015,
-                es2015: ts.ModuleKind.ES2015,
-                esnext: ts.ModuleKind.ESNext
-            }),
-            paramType: ts.Diagnostics.KIND,
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Specify_module_code_generation_Colon_none_commonjs_amd_system_umd_es2015_or_ESNext,
-        },
-        {
-            name: "lib",
-            type: "list",
-            element: {
-                name: "lib",
-                type: ts.createMapFromTemplate({
-                    // JavaScript only
-                    "es5": "lib.es5.d.ts",
-                    "es6": "lib.es2015.d.ts",
-                    "es2015": "lib.es2015.d.ts",
-                    "es7": "lib.es2016.d.ts",
-                    "es2016": "lib.es2016.d.ts",
-                    "es2017": "lib.es2017.d.ts",
-                    "es2018": "lib.es2018.d.ts",
-                    "esnext": "lib.esnext.d.ts",
-                    // Host only
-                    "dom": "lib.dom.d.ts",
-                    "dom.iterable": "lib.dom.iterable.d.ts",
-                    "webworker": "lib.webworker.d.ts",
-                    "scripthost": "lib.scripthost.d.ts",
-                    // ES2015 Or ESNext By-feature options
-                    "es2015.core": "lib.es2015.core.d.ts",
-                    "es2015.collection": "lib.es2015.collection.d.ts",
-                    "es2015.generator": "lib.es2015.generator.d.ts",
-                    "es2015.iterable": "lib.es2015.iterable.d.ts",
-                    "es2015.promise": "lib.es2015.promise.d.ts",
-                    "es2015.proxy": "lib.es2015.proxy.d.ts",
-                    "es2015.reflect": "lib.es2015.reflect.d.ts",
-                    "es2015.symbol": "lib.es2015.symbol.d.ts",
-                    "es2015.symbol.wellknown": "lib.es2015.symbol.wellknown.d.ts",
-                    "es2016.array.include": "lib.es2016.array.include.d.ts",
-                    "es2017.object": "lib.es2017.object.d.ts",
-                    "es2017.sharedmemory": "lib.es2017.sharedmemory.d.ts",
-                    "es2017.string": "lib.es2017.string.d.ts",
-                    "es2017.intl": "lib.es2017.intl.d.ts",
-                    "es2017.typedarrays": "lib.es2017.typedarrays.d.ts",
-                    "es2018.intl": "lib.es2018.intl.d.ts",
-                    "es2018.promise": "lib.es2018.promise.d.ts",
-                    "es2018.regexp": "lib.es2018.regexp.d.ts",
-                    "esnext.array": "lib.esnext.array.d.ts",
-                    "esnext.symbol": "lib.esnext.symbol.d.ts",
-                    "esnext.asynciterable": "lib.esnext.asynciterable.d.ts",
-                }),
-            },
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Specify_library_files_to_be_included_in_the_compilation
-        },
-        {
-            name: "allowJs",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Allow_javascript_files_to_be_compiled
-        },
-        {
-            name: "checkJs",
-            type: "boolean",
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Report_errors_in_js_files
-        },
-        {
-            name: "jsx",
-            type: ts.createMapFromTemplate({
-                "preserve": 1 /* Preserve */,
-                "react-native": 3 /* ReactNative */,
-                "react": 2 /* React */
-            }),
-            paramType: ts.Diagnostics.KIND,
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Specify_JSX_code_generation_Colon_preserve_react_native_or_react,
-        },
-        {
-            name: "declaration",
-            shortName: "d",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Generates_corresponding_d_ts_file,
-        },
-        {
-            name: "declarationMap",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Generates_a_sourcemap_for_each_corresponding_d_ts_file,
-        },
-        {
-            name: "emitDeclarationOnly",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Only_emit_d_ts_declaration_files,
-        },
-        {
-            name: "sourceMap",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Generates_corresponding_map_file,
-        },
-        {
-            name: "outFile",
-            type: "string",
-            isFilePath: true,
-            paramType: ts.Diagnostics.FILE,
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Concatenate_and_emit_output_to_single_file,
-        },
-        {
-            name: "outDir",
-            type: "string",
-            isFilePath: true,
-            paramType: ts.Diagnostics.DIRECTORY,
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Redirect_output_structure_to_the_directory,
-        },
-        {
-            name: "rootDir",
-            type: "string",
-            isFilePath: true,
-            paramType: ts.Diagnostics.LOCATION,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Specify_the_root_directory_of_input_files_Use_to_control_the_output_directory_structure_with_outDir,
-        },
-        {
-            name: "composite",
-            type: "boolean",
-            isTSConfigOnly: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Enable_project_compilation,
-        },
-        {
-            name: "removeComments",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Do_not_emit_comments_to_output,
-        },
-        {
-            name: "noEmit",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Do_not_emit_outputs,
-        },
-        {
-            name: "importHelpers",
-            type: "boolean",
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Import_emit_helpers_from_tslib
-        },
-        {
-            name: "downlevelIteration",
-            type: "boolean",
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Provide_full_support_for_iterables_in_for_of_spread_and_destructuring_when_targeting_ES5_or_ES3
-        },
-        {
-            name: "isolatedModules",
-            type: "boolean",
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Transpile_each_file_as_a_separate_module_similar_to_ts_transpileModule
-        },
-        // Strict Type Checks
-        {
-            name: "strict",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Strict_Type_Checking_Options,
-            description: ts.Diagnostics.Enable_all_strict_type_checking_options
-        },
-        {
-            name: "noImplicitAny",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Strict_Type_Checking_Options,
-            description: ts.Diagnostics.Raise_error_on_expressions_and_declarations_with_an_implied_any_type,
-        },
-        {
-            name: "strictNullChecks",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Strict_Type_Checking_Options,
-            description: ts.Diagnostics.Enable_strict_null_checks
-        },
-        {
-            name: "strictFunctionTypes",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Strict_Type_Checking_Options,
-            description: ts.Diagnostics.Enable_strict_checking_of_function_types
-        },
-        {
-            name: "strictPropertyInitialization",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Strict_Type_Checking_Options,
-            description: ts.Diagnostics.Enable_strict_checking_of_property_initialization_in_classes
-        },
-        {
-            name: "noImplicitThis",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Strict_Type_Checking_Options,
-            description: ts.Diagnostics.Raise_error_on_this_expressions_with_an_implied_any_type,
-        },
-        {
-            name: "alwaysStrict",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Strict_Type_Checking_Options,
-            description: ts.Diagnostics.Parse_in_strict_mode_and_emit_use_strict_for_each_source_file
-        },
-        // Additional Checks
-        {
-            name: "noUnusedLocals",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Additional_Checks,
-            description: ts.Diagnostics.Report_errors_on_unused_locals,
-        },
-        {
-            name: "noUnusedParameters",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Additional_Checks,
-            description: ts.Diagnostics.Report_errors_on_unused_parameters,
-        },
-        {
-            name: "noImplicitReturns",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Additional_Checks,
-            description: ts.Diagnostics.Report_error_when_not_all_code_paths_in_function_return_a_value
-        },
-        {
-            name: "noFallthroughCasesInSwitch",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Additional_Checks,
-            description: ts.Diagnostics.Report_errors_for_fallthrough_cases_in_switch_statement
-        },
-        // Module Resolution
-        {
-            name: "moduleResolution",
-            type: ts.createMapFromTemplate({
-                node: ts.ModuleResolutionKind.NodeJs,
-                classic: ts.ModuleResolutionKind.Classic,
-            }),
-            paramType: ts.Diagnostics.STRATEGY,
-            category: ts.Diagnostics.Module_Resolution_Options,
-            description: ts.Diagnostics.Specify_module_resolution_strategy_Colon_node_Node_js_or_classic_TypeScript_pre_1_6,
-        },
-        {
-            name: "baseUrl",
-            type: "string",
-            isFilePath: true,
-            category: ts.Diagnostics.Module_Resolution_Options,
-            description: ts.Diagnostics.Base_directory_to_resolve_non_absolute_module_names
-        },
-        {
-            // this option can only be specified in tsconfig.json
-            // use type = object to copy the value as-is
-            name: "paths",
-            type: "object",
-            isTSConfigOnly: true,
-            category: ts.Diagnostics.Module_Resolution_Options,
-            description: ts.Diagnostics.A_series_of_entries_which_re_map_imports_to_lookup_locations_relative_to_the_baseUrl
-        },
-        {
-            // this option can only be specified in tsconfig.json
-            // use type = object to copy the value as-is
-            name: "rootDirs",
-            type: "list",
-            isTSConfigOnly: true,
-            element: {
-                name: "rootDirs",
-                type: "string",
-                isFilePath: true
-            },
-            category: ts.Diagnostics.Module_Resolution_Options,
-            description: ts.Diagnostics.List_of_root_folders_whose_combined_content_represents_the_structure_of_the_project_at_runtime
-        },
-        {
-            name: "typeRoots",
-            type: "list",
-            element: {
-                name: "typeRoots",
-                type: "string",
-                isFilePath: true
-            },
-            category: ts.Diagnostics.Module_Resolution_Options,
-            description: ts.Diagnostics.List_of_folders_to_include_type_definitions_from
-        },
-        {
-            name: "types",
-            type: "list",
-            element: {
-                name: "types",
-                type: "string"
-            },
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Module_Resolution_Options,
-            description: ts.Diagnostics.Type_declaration_files_to_be_included_in_compilation
-        },
-        {
-            name: "allowSyntheticDefaultImports",
-            type: "boolean",
-            category: ts.Diagnostics.Module_Resolution_Options,
-            description: ts.Diagnostics.Allow_default_imports_from_modules_with_no_default_export_This_does_not_affect_code_emit_just_typechecking
-        },
-        {
-            name: "esModuleInterop",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Module_Resolution_Options,
-            description: ts.Diagnostics.Enables_emit_interoperability_between_CommonJS_and_ES_Modules_via_creation_of_namespace_objects_for_all_imports_Implies_allowSyntheticDefaultImports
-        },
-        {
-            name: "preserveSymlinks",
-            type: "boolean",
-            category: ts.Diagnostics.Module_Resolution_Options,
-            description: ts.Diagnostics.Do_not_resolve_the_real_path_of_symlinks,
-        },
-        // Source Maps
-        {
-            name: "sourceRoot",
-            type: "string",
-            isFilePath: true,
-            paramType: ts.Diagnostics.LOCATION,
-            category: ts.Diagnostics.Source_Map_Options,
-            description: ts.Diagnostics.Specify_the_location_where_debugger_should_locate_TypeScript_files_instead_of_source_locations,
-        },
-        {
-            name: "mapRoot",
-            type: "string",
-            isFilePath: true,
-            paramType: ts.Diagnostics.LOCATION,
-            category: ts.Diagnostics.Source_Map_Options,
-            description: ts.Diagnostics.Specify_the_location_where_debugger_should_locate_map_files_instead_of_generated_locations,
-        },
-        {
-            name: "inlineSourceMap",
-            type: "boolean",
-            category: ts.Diagnostics.Source_Map_Options,
-            description: ts.Diagnostics.Emit_a_single_file_with_source_maps_instead_of_having_a_separate_file
-        },
-        {
-            name: "inlineSources",
-            type: "boolean",
-            category: ts.Diagnostics.Source_Map_Options,
-            description: ts.Diagnostics.Emit_the_source_alongside_the_sourcemaps_within_a_single_file_requires_inlineSourceMap_or_sourceMap_to_be_set
-        },
-        // Experimental
-        {
-            name: "experimentalDecorators",
-            type: "boolean",
-            category: ts.Diagnostics.Experimental_Options,
-            description: ts.Diagnostics.Enables_experimental_support_for_ES7_decorators
-        },
-        {
-            name: "emitDecoratorMetadata",
-            type: "boolean",
-            category: ts.Diagnostics.Experimental_Options,
-            description: ts.Diagnostics.Enables_experimental_support_for_emitting_type_metadata_for_decorators
-        },
-        // Advanced
-        {
-            name: "jsxFactory",
-            type: "string",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Specify_the_JSX_factory_function_to_use_when_targeting_react_JSX_emit_e_g_React_createElement_or_h
-        },
-        {
-            name: "diagnostics",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Show_diagnostic_information
-        },
-        {
-            name: "extendedDiagnostics",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Show_verbose_diagnostic_information
-        },
-        {
-            name: "traceResolution",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Enable_tracing_of_the_name_resolution_process
-        },
-        {
-            name: "resolveJsonModule",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Include_modules_imported_with_json_extension
-        },
-        {
-            name: "listFiles",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Print_names_of_files_part_of_the_compilation
-        },
-        {
-            name: "listEmittedFiles",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Print_names_of_generated_files_part_of_the_compilation
-        },
-        {
-            name: "out",
-            type: "string",
-            isFilePath: false,
-            // for correct behaviour, please use outFile
-            category: ts.Diagnostics.Advanced_Options,
-            paramType: ts.Diagnostics.FILE,
-            description: ts.Diagnostics.Deprecated_Use_outFile_instead_Concatenate_and_emit_output_to_single_file,
-        },
-        {
-            name: "reactNamespace",
-            type: "string",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Deprecated_Use_jsxFactory_instead_Specify_the_object_invoked_for_createElement_when_targeting_react_JSX_emit
-        },
-        {
-            name: "skipDefaultLibCheck",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Deprecated_Use_skipLibCheck_instead_Skip_type_checking_of_default_library_declaration_files
-        },
-        {
-            name: "charset",
-            type: "string",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.The_character_set_of_the_input_files
-        },
-        {
-            name: "emitBOM",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Emit_a_UTF_8_Byte_Order_Mark_BOM_in_the_beginning_of_output_files
-        },
-        {
-            name: "locale",
-            type: "string",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.The_locale_used_when_displaying_messages_to_the_user_e_g_en_us
-        },
-        {
-            name: "newLine",
-            type: ts.createMapFromTemplate({
-                crlf: 0 /* CarriageReturnLineFeed */,
-                lf: 1 /* LineFeed */
-            }),
-            paramType: ts.Diagnostics.NEWLINE,
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Specify_the_end_of_line_sequence_to_be_used_when_emitting_files_Colon_CRLF_dos_or_LF_unix,
-        },
-        {
-            name: "noErrorTruncation",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Do_not_truncate_error_messages
-        },
-        {
-            name: "noLib",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Do_not_include_the_default_library_file_lib_d_ts
-        },
-        {
-            name: "noResolve",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Do_not_add_triple_slash_references_or_imported_modules_to_the_list_of_compiled_files
-        },
-        {
-            name: "stripInternal",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Do_not_emit_declarations_for_code_that_has_an_internal_annotation,
-        },
-        {
-            name: "disableSizeLimit",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Disable_size_limitations_on_JavaScript_projects
-        },
-        {
-            name: "noImplicitUseStrict",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Do_not_emit_use_strict_directives_in_module_output
-        },
-        {
-            name: "noEmitHelpers",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Do_not_generate_custom_helper_functions_like_extends_in_compiled_output
-        },
-        {
-            name: "noEmitOnError",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Do_not_emit_outputs_if_any_errors_were_reported,
-        },
-        {
-            name: "preserveConstEnums",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Do_not_erase_const_enum_declarations_in_generated_code
-        },
-        {
-            name: "declarationDir",
-            type: "string",
-            isFilePath: true,
-            paramType: ts.Diagnostics.DIRECTORY,
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Output_directory_for_generated_declaration_files
-        },
-        {
-            name: "skipLibCheck",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Skip_type_checking_of_declaration_files,
-        },
-        {
-            name: "allowUnusedLabels",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Do_not_report_errors_on_unused_labels
-        },
-        {
-            name: "allowUnreachableCode",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Do_not_report_errors_on_unreachable_code
-        },
-        {
-            name: "suppressExcessPropertyErrors",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Suppress_excess_property_checks_for_object_literals,
-        },
-        {
-            name: "suppressImplicitAnyIndexErrors",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Suppress_noImplicitAny_errors_for_indexing_objects_lacking_index_signatures,
-        },
-        {
-            name: "forceConsistentCasingInFileNames",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Disallow_inconsistently_cased_references_to_the_same_file
-        },
-        {
-            name: "maxNodeModuleJsDepth",
-            type: "number",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.The_maximum_dependency_depth_to_search_under_node_modules_and_load_JavaScript_files
-        },
-        {
-            name: "noStrictGenericChecks",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Disable_strict_checking_of_generic_signatures_in_function_types,
-        },
-        {
-            name: "keyofStringsOnly",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Resolve_keyof_to_string_valued_property_names_only_no_numbers_or_symbols,
-        },
-        {
-            // A list of plugins to load in the language service
-            name: "plugins",
-            type: "list",
-            isTSConfigOnly: true,
-            element: {
-                name: "plugin",
-                type: "object"
-            },
-            description: ts.Diagnostics.List_of_language_service_plugins
+            type: "boolean"
         }
     ];
-    /* @internal */
-    ts.typeAcquisitionDeclarations = [
-        {
-            /* @deprecated typingOptions.enableAutoDiscovery
-             * Use typeAcquisition.enable instead.
-             */
-            name: "enableAutoDiscovery",
-            type: "boolean",
-        },
-        {
-            name: "enable",
-            type: "boolean",
-        },
-        {
-            name: "include",
-            type: "list",
-            element: {
-                name: "include",
-                type: "string"
+    function performBuild(args, compilerHost, buildHost, system) {
+        var verbose = false;
+        var dry = false;
+        var force = false;
+        var clean = false;
+        var watch = false;
+        var projects = [];
+        for (var _i = 0, args_3 = args; _i < args_3.length; _i++) {
+            var arg = args_3[_i];
+            switch (arg.toLowerCase()) {
+                case "-v":
+                case "--verbose":
+                    verbose = true;
+                    continue;
+                case "-d":
+                case "--dry":
+                    dry = true;
+                    continue;
+                case "-f":
+                case "--force":
+                    force = true;
+                    continue;
+                case "--clean":
+                    clean = true;
+                    continue;
+                case "--watch":
+                case "-w":
+                    watch = true;
+                    continue;
+                case "--?":
+                case "-?":
+                case "--help":
+                    return ts.printHelp(buildOpts, "--build ");
             }
-        },
-        {
-            name: "exclude",
-            type: "list",
-            element: {
-                name: "exclude",
-                type: "string"
+            // Not a flag, parse as filename
+            addProject(arg);
+        }
+        // Nonsensical combinations
+        if (clean && force) {
+            return buildHost.error(ts.Diagnostics.Options_0_and_1_cannot_be_combined, "clean", "force");
+        }
+        if (clean && verbose) {
+            return buildHost.error(ts.Diagnostics.Options_0_and_1_cannot_be_combined, "clean", "verbose");
+        }
+        if (clean && watch) {
+            return buildHost.error(ts.Diagnostics.Options_0_and_1_cannot_be_combined, "clean", "watch");
+        }
+        if (watch && dry) {
+            return buildHost.error(ts.Diagnostics.Options_0_and_1_cannot_be_combined, "watch", "dry");
+        }
+        if (projects.length === 0) {
+            // tsc -b invoked with no extra arguments; act as if invoked with "tsc -b ."
+            addProject(".");
+        }
+        var builder = createSolutionBuilder(compilerHost, buildHost, projects, { dry: dry, force: force, verbose: verbose }, system);
+        if (clean) {
+            builder.cleanAllProjects();
+        }
+        else {
+            builder.buildAllProjects();
+        }
+        if (watch) {
+            return builder.startWatching();
+        }
+        function addProject(projectSpecification) {
+            var fileName = ts.resolvePath(compilerHost.getCurrentDirectory(), projectSpecification);
+            var refPath = ts.resolveProjectReferencePath(compilerHost, { path: fileName });
+            if (!refPath) {
+                return buildHost.error(ts.Diagnostics.File_0_does_not_exist, projectSpecification);
             }
-        }
-    ];
-    /* @internal */
-    ts.defaultInitCompilerOptions = {
-        module: ts.ModuleKind.CommonJS,
-        target: 1 /* ES5 */,
-        strict: true,
-        esModuleInterop: true
-    };
-    var optionNameMapCache;
-    /* @internal */
-    function convertEnableAutoDiscoveryToEnable(typeAcquisition) {
-        // Convert deprecated typingOptions.enableAutoDiscovery to typeAcquisition.enable
-        if (typeAcquisition && typeAcquisition.enableAutoDiscovery !== undefined && typeAcquisition.enable === undefined) {
-            return {
-                enable: typeAcquisition.enableAutoDiscovery,
-                include: typeAcquisition.include || [],
-                exclude: typeAcquisition.exclude || []
-            };
-        }
-        return typeAcquisition;
-    }
-    ts.convertEnableAutoDiscoveryToEnable = convertEnableAutoDiscoveryToEnable;
-    function getOptionNameMap() {
-        if (optionNameMapCache) {
-            return optionNameMapCache;
-        }
-        var optionNameMap = ts.createMap();
-        var shortOptionNames = ts.createMap();
-        ts.forEach(ts.optionDeclarations, function (option) {
-            optionNameMap.set(option.name.toLowerCase(), option);
-            if (option.shortName) {
-                shortOptionNames.set(option.shortName, option.name);
+            if (!compilerHost.fileExists(refPath)) {
+                return buildHost.error(ts.Diagnostics.File_0_does_not_exist, fileName);
             }
-        });
-        optionNameMapCache = { optionNameMap: optionNameMap, shortOptionNames: shortOptionNames };
-        return optionNameMapCache;
-    }
-    /* @internal */
-    function createCompilerDiagnosticForInvalidCustomType(opt) {
-        return createDiagnosticForInvalidCustomType(opt, ts.createCompilerDiagnostic);
-    }
-    ts.createCompilerDiagnosticForInvalidCustomType = createCompilerDiagnosticForInvalidCustomType;
-    function createDiagnosticForInvalidCustomType(opt, createDiagnostic) {
-        var namesOfType = ts.arrayFrom(opt.type.keys()).map(function (key) { return "'" + key + "'"; }).join(", ");
-        return createDiagnostic(ts.Diagnostics.Argument_for_0_option_must_be_Colon_1, "--" + opt.name, namesOfType);
-    }
-    /* @internal */
-    function parseCustomTypeOption(opt, value, errors) {
-        return convertJsonOptionOfCustomType(opt, trimString(value || ""), errors);
-    }
-    ts.parseCustomTypeOption = parseCustomTypeOption;
-    /* @internal */
-    function parseListTypeOption(opt, value, errors) {
-        if (value === void 0) { value = ""; }
-        value = trimString(value);
-        if (ts.startsWith(value, "-")) {
-            return undefined;
-        }
-        if (value === "") {
-            return [];
-        }
-        var values = value.split(",");
-        switch (opt.element.type) {
-            case "number":
-                return ts.map(values, parseInt);
-            case "string":
-                return ts.map(values, function (v) { return v || ""; });
-            default:
-                return ts.mapDefined(values, function (v) { return parseCustomTypeOption(opt.element, v, errors); });
+            projects.push(refPath);
         }
     }
-    ts.parseListTypeOption = parseListTypeOption;
-    function parseCommandLine(commandLine, readFile) {
-        var options = {};
-        var fileNames = [];
-        var projectReferences = undefined;
-        var errors = [];
-        parseStrings(commandLine);
+    ts.performBuild = performBuild;
+    /**
+     * A SolutionBuilder has an immutable set of rootNames that are the "entry point" projects, but
+     * can dynamically add/remove other projects based on changes on the rootNames' references
+     */
+    function createSolutionBuilder(compilerHost, buildHost, rootNames, defaultOptions, system) {
+        if (!compilerHost.getModifiedTime || !compilerHost.setModifiedTime) {
+            throw new Error("Host must support timestamp APIs");
+        }
+        var configFileCache = createConfigFileCache(compilerHost);
+        var context = createBuildContext(defaultOptions);
+        var existingWatchersForWildcards = ts.createMap();
         return {
-            options: options,
-            fileNames: fileNames,
-            projectReferences: projectReferences,
-            errors: errors
+            buildAllProjects: buildAllProjects,
+            getUpToDateStatus: getUpToDateStatus,
+            getUpToDateStatusOfFile: getUpToDateStatusOfFile,
+            cleanAllProjects: cleanAllProjects,
+            resetBuildContext: resetBuildContext,
+            getBuildGraph: getBuildGraph,
+            invalidateProject: invalidateProject,
+            buildInvalidatedProjects: buildInvalidatedProjects,
+            buildDependentInvalidatedProjects: buildDependentInvalidatedProjects,
+            resolveProjectName: resolveProjectName,
+            startWatching: startWatching
         };
-        function parseStrings(args) {
-            var i = 0;
-            while (i < args.length) {
-                var s = args[i];
-                i++;
-                if (s.charCodeAt(0) === 64 /* at */) {
-                    parseResponseFile(s.slice(1));
-                }
-                else if (s.charCodeAt(0) === 45 /* minus */) {
-                    var opt = getOptionFromName(s.slice(s.charCodeAt(1) === 45 /* minus */ ? 2 : 1), /*allowShort*/ true);
-                    if (opt) {
-                        if (opt.isTSConfigOnly) {
-                            errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Option_0_can_only_be_specified_in_tsconfig_json_file, opt.name));
-                        }
-                        else {
-                            // Check to see if no argument was provided (e.g. "--locale" is the last command-line argument).
-                            if (!args[i] && opt.type !== "boolean") {
-                                errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Compiler_option_0_expects_an_argument, opt.name));
-                            }
-                            switch (opt.type) {
-                                case "number":
-                                    options[opt.name] = parseInt(args[i]);
-                                    i++;
-                                    break;
-                                case "boolean":
-                                    // boolean flag has optional value true, false, others
-                                    var optValue = args[i];
-                                    options[opt.name] = optValue !== "false";
-                                    // consume next argument as boolean flag value
-                                    if (optValue === "false" || optValue === "true") {
-                                        i++;
-                                    }
-                                    break;
-                                case "string":
-                                    options[opt.name] = args[i] || "";
-                                    i++;
-                                    break;
-                                case "list":
-                                    var result = parseListTypeOption(opt, args[i], errors);
-                                    options[opt.name] = result || [];
-                                    if (result) {
-                                        i++;
-                                    }
-                                    break;
-                                // If not a primitive, the possible types are specified in what is effectively a map of options.
-                                default:
-                                    options[opt.name] = parseCustomTypeOption(opt, args[i], errors);
-                                    i++;
-                                    break;
-                            }
-                        }
-                    }
-                    else {
-                        errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Unknown_compiler_option_0, s));
-                    }
-                }
-                else {
-                    fileNames.push(s);
-                }
-            }
-        }
-        function parseResponseFile(fileName) {
-            var text = readFile ? readFile(fileName) : ts.sys.readFile(fileName);
-            if (!text) {
-                errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.File_0_not_found, fileName));
+        function startWatching() {
+            if (!system)
+                throw new Error("System host must be provided if using --watch");
+            if (!system.watchFile || !system.watchDirectory || !system.setTimeout)
+                throw new Error("System host must support watchFile / watchDirectory / setTimeout if using --watch");
+            var graph = getGlobalDependencyGraph();
+            if (!graph.buildQueue) {
+                // Everything is broken - we don't even know what to watch. Give up.
                 return;
             }
-            var args = [];
-            var pos = 0;
-            while (true) {
-                while (pos < text.length && text.charCodeAt(pos) <= 32 /* space */)
-                    pos++;
-                if (pos >= text.length)
-                    break;
-                var start = pos;
-                if (text.charCodeAt(start) === 34 /* doubleQuote */) {
-                    pos++;
-                    while (pos < text.length && text.charCodeAt(pos) !== 34 /* doubleQuote */)
-                        pos++;
-                    if (pos < text.length) {
-                        args.push(text.substring(start + 1, pos));
-                        pos++;
-                    }
-                    else {
-                        errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Unterminated_quoted_string_in_response_file_0, fileName));
-                    }
-                }
-                else {
-                    while (text.charCodeAt(pos) > 32 /* space */)
-                        pos++;
-                    args.push(text.substring(start, pos));
-                }
-            }
-            parseStrings(args);
-        }
-    }
-    ts.parseCommandLine = parseCommandLine;
-    /** @internal */
-    function getOptionFromName(optionName, allowShort) {
-        if (allowShort === void 0) { allowShort = false; }
-        optionName = optionName.toLowerCase();
-        var _a = getOptionNameMap(), optionNameMap = _a.optionNameMap, shortOptionNames = _a.shortOptionNames;
-        // Try to translate short option names to their full equivalents.
-        if (allowShort) {
-            var short = shortOptionNames.get(optionName);
-            if (short !== undefined) {
-                optionName = short;
-            }
-        }
-        return optionNameMap.get(optionName);
-    }
-    ts.getOptionFromName = getOptionFromName;
-    /**
-     * Reads the config file, reports errors if any and exits if the config file cannot be found
-     */
-    function getParsedCommandLineOfConfigFile(configFileName, optionsToExtend, host) {
-        var configFileText;
-        try {
-            configFileText = host.readFile(configFileName);
-        }
-        catch (e) {
-            var error = ts.createCompilerDiagnostic(ts.Diagnostics.Cannot_read_file_0_Colon_1, configFileName, e.message);
-            host.onUnRecoverableConfigFileDiagnostic(error);
-            return undefined;
-        }
-        if (!configFileText) {
-            var error = ts.createCompilerDiagnostic(ts.Diagnostics.File_0_not_found, configFileName);
-            host.onUnRecoverableConfigFileDiagnostic(error);
-            return undefined;
-        }
-        var result = ts.parseJsonText(configFileName, configFileText);
-        var cwd = host.getCurrentDirectory();
-        return parseJsonSourceFileConfigFileContent(result, host, ts.getNormalizedAbsolutePath(ts.getDirectoryPath(configFileName), cwd), optionsToExtend, ts.getNormalizedAbsolutePath(configFileName, cwd));
-    }
-    ts.getParsedCommandLineOfConfigFile = getParsedCommandLineOfConfigFile;
-    /**
-     * Read tsconfig.json file
-     * @param fileName The path to the config file
-     */
-    function readConfigFile(fileName, readFile) {
-        var textOrDiagnostic = tryReadFile(fileName, readFile);
-        return ts.isString(textOrDiagnostic) ? parseConfigFileTextToJson(fileName, textOrDiagnostic) : { config: {}, error: textOrDiagnostic };
-    }
-    ts.readConfigFile = readConfigFile;
-    /**
-     * Parse the text of the tsconfig.json file
-     * @param fileName The path to the config file
-     * @param jsonText The text of the config file
-     */
-    function parseConfigFileTextToJson(fileName, jsonText) {
-        var jsonSourceFile = ts.parseJsonText(fileName, jsonText);
-        return {
-            config: convertToObject(jsonSourceFile, jsonSourceFile.parseDiagnostics),
-            error: jsonSourceFile.parseDiagnostics.length ? jsonSourceFile.parseDiagnostics[0] : undefined
-        };
-    }
-    ts.parseConfigFileTextToJson = parseConfigFileTextToJson;
-    /**
-     * Read tsconfig.json file
-     * @param fileName The path to the config file
-     */
-    function readJsonConfigFile(fileName, readFile) {
-        var textOrDiagnostic = tryReadFile(fileName, readFile);
-        return ts.isString(textOrDiagnostic) ? ts.parseJsonText(fileName, textOrDiagnostic) : { parseDiagnostics: [textOrDiagnostic] };
-    }
-    ts.readJsonConfigFile = readJsonConfigFile;
-    function tryReadFile(fileName, readFile) {
-        var text;
-        try {
-            text = readFile(fileName);
-        }
-        catch (e) {
-            return ts.createCompilerDiagnostic(ts.Diagnostics.Cannot_read_file_0_Colon_1, fileName, e.message);
-        }
-        return text === undefined ? ts.createCompilerDiagnostic(ts.Diagnostics.The_specified_path_does_not_exist_Colon_0, fileName) : text;
-    }
-    function commandLineOptionsToMap(options) {
-        return ts.arrayToMap(options, function (option) { return option.name; });
-    }
-    var _tsconfigRootOptions;
-    function getTsconfigRootOptionsMap() {
-        if (_tsconfigRootOptions === undefined) {
-            _tsconfigRootOptions = {
-                name: undefined,
-                type: "object",
-                elementOptions: commandLineOptionsToMap([
-                    {
-                        name: "compilerOptions",
-                        type: "object",
-                        elementOptions: commandLineOptionsToMap(ts.optionDeclarations),
-                        extraKeyDiagnosticMessage: ts.Diagnostics.Unknown_compiler_option_0
-                    },
-                    {
-                        name: "typingOptions",
-                        type: "object",
-                        elementOptions: commandLineOptionsToMap(ts.typeAcquisitionDeclarations),
-                        extraKeyDiagnosticMessage: ts.Diagnostics.Unknown_type_acquisition_option_0
-                    },
-                    {
-                        name: "typeAcquisition",
-                        type: "object",
-                        elementOptions: commandLineOptionsToMap(ts.typeAcquisitionDeclarations),
-                        extraKeyDiagnosticMessage: ts.Diagnostics.Unknown_type_acquisition_option_0
-                    },
-                    {
-                        name: "extends",
-                        type: "string"
-                    },
-                    {
-                        name: "references",
-                        type: "list",
-                        element: {
-                            name: "references",
-                            type: "object"
-                        }
-                    },
-                    {
-                        name: "files",
-                        type: "list",
-                        element: {
-                            name: "files",
-                            type: "string"
-                        }
-                    },
-                    {
-                        name: "include",
-                        type: "list",
-                        element: {
-                            name: "include",
-                            type: "string"
-                        }
-                    },
-                    {
-                        name: "exclude",
-                        type: "list",
-                        element: {
-                            name: "exclude",
-                            type: "string"
-                        }
-                    },
-                    ts.compileOnSaveCommandLineOption
-                ])
-            };
-        }
-        return _tsconfigRootOptions;
-    }
-    /**
-     * Convert the json syntax tree into the json value
-     */
-    function convertToObject(sourceFile, errors) {
-        return convertToObjectWorker(sourceFile, errors, /*returnValue*/ true, /*knownRootOptions*/ undefined, /*jsonConversionNotifier*/ undefined);
-    }
-    ts.convertToObject = convertToObject;
-    /**
-     * Convert the json syntax tree into the json value and report errors
-     * This returns the json value (apart from checking errors) only if returnValue provided is true.
-     * Otherwise it just checks the errors and returns undefined
-     */
-    /*@internal*/
-    function convertToObjectWorker(sourceFile, errors, returnValue, knownRootOptions, jsonConversionNotifier) {
-        if (!sourceFile.statements.length) {
-            return returnValue ? {} : undefined;
-        }
-        return convertPropertyValueToJson(sourceFile.statements[0].expression, knownRootOptions);
-        function isRootOptionMap(knownOptions) {
-            return knownRootOptions && knownRootOptions.elementOptions === knownOptions;
-        }
-        function convertObjectLiteralExpressionToJson(node, knownOptions, extraKeyDiagnosticMessage, parentOption) {
-            var result = returnValue ? {} : undefined;
-            for (var _i = 0, _a = node.properties; _i < _a.length; _i++) {
-                var element = _a[_i];
-                if (element.kind !== 270 /* PropertyAssignment */) {
-                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, element, ts.Diagnostics.Property_assignment_expected));
-                    continue;
-                }
-                if (element.questionToken) {
-                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, element.questionToken, ts.Diagnostics._0_can_only_be_used_in_a_ts_file, "?"));
-                }
-                if (!isDoubleQuotedString(element.name)) {
-                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, element.name, ts.Diagnostics.String_literal_with_double_quotes_expected));
-                }
-                var keyText = ts.unescapeLeadingUnderscores(ts.getTextOfPropertyName(element.name));
-                var option = knownOptions ? knownOptions.get(keyText) : undefined;
-                if (extraKeyDiagnosticMessage && !option) {
-                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, element.name, extraKeyDiagnosticMessage, keyText));
-                }
-                var value = convertPropertyValueToJson(element.initializer, option);
-                if (typeof keyText !== "undefined") {
-                    if (returnValue) {
-                        result[keyText] = value;
-                    }
-                    // Notify key value set, if user asked for it
-                    if (jsonConversionNotifier &&
-                        // Current callbacks are only on known parent option or if we are setting values in the root
-                        (parentOption || isRootOptionMap(knownOptions))) {
-                        var isValidOptionValue = isCompilerOptionsValue(option, value);
-                        if (parentOption) {
-                            if (isValidOptionValue) {
-                                // Notify option set in the parent if its a valid option value
-                                jsonConversionNotifier.onSetValidOptionKeyValueInParent(parentOption, option, value);
-                            }
-                        }
-                        else if (isRootOptionMap(knownOptions)) {
-                            if (isValidOptionValue) {
-                                // Notify about the valid root key value being set
-                                jsonConversionNotifier.onSetValidOptionKeyValueInRoot(keyText, element.name, value, element.initializer);
-                            }
-                            else if (!option) {
-                                // Notify about the unknown root key value being set
-                                jsonConversionNotifier.onSetUnknownOptionKeyValueInRoot(keyText, element.name, value, element.initializer);
-                            }
-                        }
-                    }
-                }
-            }
-            return result;
-        }
-        function convertArrayLiteralExpressionToJson(elements, elementOption) {
-            return (returnValue ? elements.map : elements.forEach).call(elements, function (element) { return convertPropertyValueToJson(element, elementOption); });
-        }
-        function convertPropertyValueToJson(valueExpression, option) {
-            switch (valueExpression.kind) {
-                case 101 /* TrueKeyword */:
-                    reportInvalidOptionValue(option && option.type !== "boolean");
-                    return true;
-                case 86 /* FalseKeyword */:
-                    reportInvalidOptionValue(option && option.type !== "boolean");
-                    return false;
-                case 95 /* NullKeyword */:
-                    reportInvalidOptionValue(option && option.name === "extends"); // "extends" is the only option we don't allow null/undefined for
-                    return null; // tslint:disable-line:no-null-keyword
-                case 9 /* StringLiteral */:
-                    if (!isDoubleQuotedString(valueExpression)) {
-                        errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, valueExpression, ts.Diagnostics.String_literal_with_double_quotes_expected));
-                    }
-                    reportInvalidOptionValue(option && (ts.isString(option.type) && option.type !== "string"));
-                    var text = valueExpression.text;
-                    if (option && !ts.isString(option.type)) {
-                        var customOption = option;
-                        // Validate custom option type
-                        if (!customOption.type.has(text.toLowerCase())) {
-                            errors.push(createDiagnosticForInvalidCustomType(customOption, function (message, arg0, arg1) { return ts.createDiagnosticForNodeInSourceFile(sourceFile, valueExpression, message, arg0, arg1); }));
-                        }
-                    }
-                    return text;
-                case 8 /* NumericLiteral */:
-                    reportInvalidOptionValue(option && option.type !== "number");
-                    return Number(valueExpression.text);
-                case 198 /* PrefixUnaryExpression */:
-                    if (valueExpression.operator !== 38 /* MinusToken */ || valueExpression.operand.kind !== 8 /* NumericLiteral */) {
-                        break; // not valid JSON syntax
-                    }
-                    reportInvalidOptionValue(option && option.type !== "number");
-                    return -Number(valueExpression.operand.text);
-                case 184 /* ObjectLiteralExpression */:
-                    reportInvalidOptionValue(option && option.type !== "object");
-                    var objectLiteralExpression = valueExpression;
-                    // Currently having element option declaration in the tsconfig with type "object"
-                    // determines if it needs onSetValidOptionKeyValueInParent callback or not
-                    // At moment there are only "compilerOptions", "typeAcquisition" and "typingOptions"
-                    // that satifies it and need it to modify options set in them (for normalizing file paths)
-                    // vs what we set in the json
-                    // If need arises, we can modify this interface and callbacks as needed
-                    if (option) {
-                        var _a = option, elementOptions = _a.elementOptions, extraKeyDiagnosticMessage = _a.extraKeyDiagnosticMessage, optionName = _a.name;
-                        return convertObjectLiteralExpressionToJson(objectLiteralExpression, elementOptions, extraKeyDiagnosticMessage, optionName);
-                    }
-                    else {
-                        return convertObjectLiteralExpressionToJson(objectLiteralExpression, /* knownOptions*/ undefined, 
-                        /*extraKeyDiagnosticMessage */ undefined, /*parentOption*/ undefined);
-                    }
-                case 183 /* ArrayLiteralExpression */:
-                    reportInvalidOptionValue(option && option.type !== "list");
-                    return convertArrayLiteralExpressionToJson(valueExpression.elements, option && option.element);
-            }
-            // Not in expected format
-            if (option) {
-                reportInvalidOptionValue(/*isError*/ true);
-            }
-            else {
-                errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, valueExpression, ts.Diagnostics.Property_value_can_only_be_string_literal_numeric_literal_true_false_null_object_literal_or_array_literal));
-            }
-            return undefined;
-            function reportInvalidOptionValue(isError) {
-                if (isError) {
-                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, valueExpression, ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, option.name, getCompilerOptionValueTypeString(option)));
-                }
-            }
-        }
-        function isDoubleQuotedString(node) {
-            return ts.isStringLiteral(node) && ts.isStringDoubleQuoted(node, sourceFile);
-        }
-    }
-    ts.convertToObjectWorker = convertToObjectWorker;
-    function getCompilerOptionValueTypeString(option) {
-        return option.type === "list" ?
-            "Array" :
-            ts.isString(option.type) ? option.type : "string";
-    }
-    function isCompilerOptionsValue(option, value) {
-        if (option) {
-            if (isNullOrUndefined(value))
-                return true; // All options are undefinable/nullable
-            if (option.type === "list") {
-                return ts.isArray(value);
-            }
-            var expectedType = ts.isString(option.type) ? option.type : "string";
-            return typeof value === expectedType;
-        }
-        return false;
-    }
-    /**
-     * Generate tsconfig configuration when running command line "--init"
-     * @param options commandlineOptions to be generated into tsconfig.json
-     * @param fileNames array of filenames to be generated into tsconfig.json
-     */
-    /* @internal */
-    function generateTSConfig(options, fileNames, newLine) {
-        var compilerOptions = ts.extend(options, ts.defaultInitCompilerOptions);
-        var compilerOptionsMap = serializeCompilerOptions(compilerOptions);
-        return writeConfigurations();
-        function getCustomTypeMapOfCommandLineOption(optionDefinition) {
-            if (optionDefinition.type === "string" || optionDefinition.type === "number" || optionDefinition.type === "boolean") {
-                // this is of a type CommandLineOptionOfPrimitiveType
-                return undefined;
-            }
-            else if (optionDefinition.type === "list") {
-                return getCustomTypeMapOfCommandLineOption(optionDefinition.element);
-            }
-            else {
-                return optionDefinition.type;
-            }
-        }
-        function getNameOfCompilerOptionValue(value, customTypeMap) {
-            // There is a typeMap associated with this command-line option so use it to map value back to its name
-            return ts.forEachEntry(customTypeMap, function (mapValue, key) {
-                if (mapValue === value) {
-                    return key;
-                }
-            });
-        }
-        function serializeCompilerOptions(options) {
-            var result = ts.createMap();
-            var optionsNameMap = getOptionNameMap().optionNameMap;
-            var _loop_11 = function (name) {
-                if (ts.hasProperty(options, name)) {
-                    // tsconfig only options cannot be specified via command line,
-                    // so we can assume that only types that can appear here string | number | boolean
-                    if (optionsNameMap.has(name) && optionsNameMap.get(name).category === ts.Diagnostics.Command_line_Options) {
-                        return "continue";
-                    }
-                    var value = options[name];
-                    var optionDefinition = optionsNameMap.get(name.toLowerCase());
-                    if (optionDefinition) {
-                        var customTypeMap_1 = getCustomTypeMapOfCommandLineOption(optionDefinition);
-                        if (!customTypeMap_1) {
-                            // There is no map associated with this compiler option then use the value as-is
-                            // This is the case if the value is expect to be string, number, boolean or list of string
-                            result.set(name, value);
-                        }
-                        else {
-                            if (optionDefinition.type === "list") {
-                                result.set(name, value.map(function (element) { return getNameOfCompilerOptionValue(element, customTypeMap_1); })); // TODO: GH#18217
-                            }
-                            else {
-                                // There is a typeMap associated with this command-line option so use it to map value back to its name
-                                result.set(name, getNameOfCompilerOptionValue(value, customTypeMap_1));
-                            }
-                        }
-                    }
-                }
-            };
-            for (var name in options) {
-                _loop_11(name);
-            }
-            return result;
-        }
-        function getDefaultValueForOption(option) {
-            switch (option.type) {
-                case "number":
-                    return 1;
-                case "boolean":
-                    return true;
-                case "string":
-                    return option.isFilePath ? "./" : "";
-                case "list":
-                    return [];
-                case "object":
-                    return {};
-                default:
-                    return option.type.keys().next().value;
-            }
-        }
-        function makePadding(paddingLength) {
-            return Array(paddingLength + 1).join(" ");
-        }
-        function isAllowedOption(_a) {
-            var category = _a.category, name = _a.name;
-            // Skip options which do not have a category or have category `Command_line_Options`
-            // Exclude all possible `Advanced_Options` in tsconfig.json which were NOT defined in command line
-            return category !== undefined
-                && category !== ts.Diagnostics.Command_line_Options
-                && (category !== ts.Diagnostics.Advanced_Options || compilerOptionsMap.has(name));
-        }
-        function writeConfigurations() {
-            // Filter applicable options to place in the file
-            var categorizedOptions = ts.createMultiMap();
-            for (var _i = 0, optionDeclarations_1 = ts.optionDeclarations; _i < optionDeclarations_1.length; _i++) {
-                var option = optionDeclarations_1[_i];
-                var category = option.category;
-                if (isAllowedOption(option)) {
-                    categorizedOptions.add(ts.getLocaleSpecificMessage(category), option);
-                }
-            }
-            // Serialize all options and their descriptions
-            var marginLength = 0;
-            var seenKnownKeys = 0;
-            var nameColumn = [];
-            var descriptionColumn = [];
-            categorizedOptions.forEach(function (options, category) {
-                if (nameColumn.length !== 0) {
-                    nameColumn.push("");
-                    descriptionColumn.push("");
-                }
-                nameColumn.push("/* " + category + " */");
-                descriptionColumn.push("");
-                for (var _i = 0, options_1 = options; _i < options_1.length; _i++) {
-                    var option = options_1[_i];
-                    var optionName = void 0;
-                    if (compilerOptionsMap.has(option.name)) {
-                        optionName = "\"" + option.name + "\": " + JSON.stringify(compilerOptionsMap.get(option.name)) + ((seenKnownKeys += 1) === compilerOptionsMap.size ? "" : ",");
-                    }
-                    else {
-                        optionName = "// \"" + option.name + "\": " + JSON.stringify(getDefaultValueForOption(option)) + ",";
-                    }
-                    nameColumn.push(optionName);
-                    descriptionColumn.push("/* " + (option.description && ts.getLocaleSpecificMessage(option.description) || option.name) + " */");
-                    marginLength = Math.max(optionName.length, marginLength);
-                }
-            });
-            // Write the output
-            var tab = makePadding(2);
-            var result = [];
-            result.push("{");
-            result.push(tab + "\"compilerOptions\": {");
-            // Print out each row, aligning all the descriptions on the same column.
-            for (var i = 0; i < nameColumn.length; i++) {
-                var optionName = nameColumn[i];
-                var description = descriptionColumn[i];
-                result.push(optionName && "" + tab + tab + optionName + (description && (makePadding(marginLength - optionName.length + 2) + description)));
-            }
-            if (fileNames.length) {
-                result.push(tab + "},");
-                result.push(tab + "\"files\": [");
-                for (var i = 0; i < fileNames.length; i++) {
-                    result.push("" + tab + tab + JSON.stringify(fileNames[i]) + (i === fileNames.length - 1 ? "" : ","));
-                }
-                result.push(tab + "]");
-            }
-            else {
-                result.push(tab + "}");
-            }
-            result.push("}");
-            return result.join(newLine);
-        }
-    }
-    ts.generateTSConfig = generateTSConfig;
-    /**
-     * Parse the contents of a config file (tsconfig.json).
-     * @param json The contents of the config file to parse
-     * @param host Instance of ParseConfigHost used to enumerate files in folder.
-     * @param basePath A root directory to resolve relative path entries in the config
-     *    file to. e.g. outDir
-     */
-    function parseJsonConfigFileContent(json, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions) {
-        return parseJsonConfigFileContentWorker(json, /*sourceFile*/ undefined, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions);
-    }
-    ts.parseJsonConfigFileContent = parseJsonConfigFileContent;
-    /**
-     * Parse the contents of a config file (tsconfig.json).
-     * @param jsonNode The contents of the config file to parse
-     * @param host Instance of ParseConfigHost used to enumerate files in folder.
-     * @param basePath A root directory to resolve relative path entries in the config
-     *    file to. e.g. outDir
-     */
-    function parseJsonSourceFileConfigFileContent(sourceFile, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions) {
-        return parseJsonConfigFileContentWorker(/*json*/ undefined, sourceFile, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions);
-    }
-    ts.parseJsonSourceFileConfigFileContent = parseJsonSourceFileConfigFileContent;
-    /*@internal*/
-    function setConfigFileInOptions(options, configFile) {
-        if (configFile) {
-            Object.defineProperty(options, "configFile", { enumerable: false, writable: false, value: configFile });
-        }
-    }
-    ts.setConfigFileInOptions = setConfigFileInOptions;
-    function isNullOrUndefined(x) {
-        // tslint:disable-next-line:no-null-keyword
-        return x === undefined || x === null;
-    }
-    function directoryOfCombinedPath(fileName, basePath) {
-        // Use the `getNormalizedAbsolutePath` function to avoid canonicalizing the path, as it must remain noncanonical
-        // until consistient casing errors are reported
-        return ts.getDirectoryPath(ts.getNormalizedAbsolutePath(fileName, basePath));
-    }
-    /**
-     * Parse the contents of a config file from json or json source file (tsconfig.json).
-     * @param json The contents of the config file to parse
-     * @param sourceFile sourceFile corresponding to the Json
-     * @param host Instance of ParseConfigHost used to enumerate files in folder.
-     * @param basePath A root directory to resolve relative path entries in the config
-     *    file to. e.g. outDir
-     * @param resolutionStack Only present for backwards-compatibility. Should be empty.
-     */
-    function parseJsonConfigFileContentWorker(json, sourceFile, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions) {
-        if (existingOptions === void 0) { existingOptions = {}; }
-        if (resolutionStack === void 0) { resolutionStack = []; }
-        if (extraFileExtensions === void 0) { extraFileExtensions = []; }
-        ts.Debug.assert((json === undefined && sourceFile !== undefined) || (json !== undefined && sourceFile === undefined));
-        var errors = [];
-        var parsedConfig = parseConfig(json, sourceFile, host, basePath, configFileName, resolutionStack, errors);
-        var raw = parsedConfig.raw;
-        var options = ts.extend(existingOptions, parsedConfig.options || {});
-        options.configFilePath = configFileName && ts.normalizeSlashes(configFileName);
-        setConfigFileInOptions(options, sourceFile);
-        var _a = getFileNames(), fileNames = _a.fileNames, wildcardDirectories = _a.wildcardDirectories, spec = _a.spec, projectReferences = _a.projectReferences;
-        return {
-            options: options,
-            fileNames: fileNames,
-            projectReferences: projectReferences,
-            typeAcquisition: parsedConfig.typeAcquisition || getDefaultTypeAcquisition(),
-            raw: raw,
-            errors: errors,
-            wildcardDirectories: wildcardDirectories,
-            compileOnSave: !!raw.compileOnSave,
-            configFileSpecs: spec
-        };
-        function getFileNames() {
-            var filesSpecs;
-            if (ts.hasProperty(raw, "files") && !isNullOrUndefined(raw.files)) {
-                if (ts.isArray(raw.files)) {
-                    filesSpecs = raw.files;
-                    if (filesSpecs.length === 0) {
-                        createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.The_files_list_in_config_file_0_is_empty, configFileName || "tsconfig.json");
-                    }
-                }
-                else {
-                    createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "files", "Array");
-                }
-            }
-            var includeSpecs;
-            if (ts.hasProperty(raw, "include") && !isNullOrUndefined(raw.include)) {
-                if (ts.isArray(raw.include)) {
-                    includeSpecs = raw.include;
-                }
-                else {
-                    createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "include", "Array");
-                }
-            }
-            var excludeSpecs;
-            if (ts.hasProperty(raw, "exclude") && !isNullOrUndefined(raw.exclude)) {
-                if (ts.isArray(raw.exclude)) {
-                    excludeSpecs = raw.exclude;
-                }
-                else {
-                    createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "exclude", "Array");
-                }
-            }
-            else if (raw.compilerOptions) {
-                var outDir = raw.compilerOptions.outDir;
-                var declarationDir = raw.compilerOptions.declarationDir;
-                if (outDir || declarationDir) {
-                    excludeSpecs = [outDir, declarationDir].filter(function (d) { return !!d; });
-                }
-            }
-            if (filesSpecs === undefined && includeSpecs === undefined) {
-                includeSpecs = ["**/*"];
-            }
-            var result = matchFileNames(filesSpecs, includeSpecs, excludeSpecs, configFileName ? directoryOfCombinedPath(configFileName, basePath) : basePath, options, host, errors, extraFileExtensions, sourceFile);
-            if (result.fileNames.length === 0 && !ts.hasProperty(raw, "files") && resolutionStack.length === 0 && !ts.hasProperty(raw, "references")) {
-                errors.push(getErrorForNoInputFiles(result.spec, configFileName));
-            }
-            if (ts.hasProperty(raw, "references") && !isNullOrUndefined(raw.references)) {
-                if (ts.isArray(raw.references)) {
-                    var references = [];
-                    for (var _i = 0, _a = raw.references; _i < _a.length; _i++) {
-                        var ref = _a[_i];
-                        if (typeof ref.path !== "string") {
-                            createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "reference.path", "string");
-                        }
-                        else {
-                            references.push({
-                                path: ts.getNormalizedAbsolutePath(ref.path, basePath),
-                                originalPath: ref.path,
-                                prepend: ref.prepend,
-                                circular: ref.circular
-                            });
-                        }
-                    }
-                    result.projectReferences = references;
-                }
-                else {
-                    createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "references", "Array");
-                }
-            }
-            return result;
-        }
-        function createCompilerDiagnosticOnlyIfJson(message, arg0, arg1) {
-            if (!sourceFile) {
-                errors.push(ts.createCompilerDiagnostic(message, arg0, arg1));
-            }
-        }
-    }
-    /*@internal*/
-    function isErrorNoInputFiles(error) {
-        return error.code === ts.Diagnostics.No_inputs_were_found_in_config_file_0_Specified_include_paths_were_1_and_exclude_paths_were_2.code;
-    }
-    ts.isErrorNoInputFiles = isErrorNoInputFiles;
-    /*@internal*/
-    function getErrorForNoInputFiles(_a, configFileName) {
-        var includeSpecs = _a.includeSpecs, excludeSpecs = _a.excludeSpecs;
-        return ts.createCompilerDiagnostic(ts.Diagnostics.No_inputs_were_found_in_config_file_0_Specified_include_paths_were_1_and_exclude_paths_were_2, configFileName || "tsconfig.json", JSON.stringify(includeSpecs || []), JSON.stringify(excludeSpecs || []));
-    }
-    ts.getErrorForNoInputFiles = getErrorForNoInputFiles;
-    function isSuccessfulParsedTsconfig(value) {
-        return !!value.options;
-    }
-    /**
-     * This *just* extracts options/include/exclude/files out of a config file.
-     * It does *not* resolve the included files.
-     */
-    function parseConfig(json, sourceFile, host, basePath, configFileName, resolutionStack, errors) {
-        basePath = ts.normalizeSlashes(basePath);
-        var resolvedPath = ts.getNormalizedAbsolutePath(configFileName || "", basePath);
-        if (resolutionStack.indexOf(resolvedPath) >= 0) {
-            errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Circularity_detected_while_resolving_configuration_Colon_0, resolutionStack.concat([resolvedPath]).join(" -> ")));
-            return { raw: json || convertToObject(sourceFile, errors) };
-        }
-        var ownConfig = json ?
-            parseOwnConfigOfJson(json, host, basePath, configFileName, errors) :
-            parseOwnConfigOfJsonSourceFile(sourceFile, host, basePath, configFileName, errors);
-        if (ownConfig.extendedConfigPath) {
-            // copy the resolution stack so it is never reused between branches in potential diamond-problem scenarios.
-            resolutionStack = resolutionStack.concat([resolvedPath]);
-            var extendedConfig = getExtendedConfig(sourceFile, ownConfig.extendedConfigPath, host, basePath, resolutionStack, errors);
-            if (extendedConfig && isSuccessfulParsedTsconfig(extendedConfig)) {
-                var baseRaw_1 = extendedConfig.raw;
-                var raw_1 = ownConfig.raw;
-                var setPropertyInRawIfNotUndefined = function (propertyName) {
-                    var value = raw_1[propertyName] || baseRaw_1[propertyName];
-                    if (value) {
-                        raw_1[propertyName] = value;
-                    }
-                };
-                setPropertyInRawIfNotUndefined("include");
-                setPropertyInRawIfNotUndefined("exclude");
-                setPropertyInRawIfNotUndefined("files");
-                if (raw_1.compileOnSave === undefined) {
-                    raw_1.compileOnSave = baseRaw_1.compileOnSave;
-                }
-                ownConfig.options = ts.assign({}, extendedConfig.options, ownConfig.options);
-                // TODO extend type typeAcquisition
-            }
-        }
-        return ownConfig;
-    }
-    function parseOwnConfigOfJson(json, host, basePath, configFileName, errors) {
-        if (ts.hasProperty(json, "excludes")) {
-            errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Unknown_option_excludes_Did_you_mean_exclude));
-        }
-        var options = convertCompilerOptionsFromJsonWorker(json.compilerOptions, basePath, errors, configFileName);
-        // typingOptions has been deprecated and is only supported for backward compatibility purposes.
-        // It should be removed in future releases - use typeAcquisition instead.
-        var typeAcquisition = convertTypeAcquisitionFromJsonWorker(json.typeAcquisition || json.typingOptions, basePath, errors, configFileName);
-        json.compileOnSave = convertCompileOnSaveOptionFromJson(json, basePath, errors);
-        var extendedConfigPath;
-        if (json.extends) {
-            if (!ts.isString(json.extends)) {
-                errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "extends", "string"));
-            }
-            else {
-                var newBase = configFileName ? directoryOfCombinedPath(configFileName, basePath) : basePath;
-                extendedConfigPath = getExtendsConfigPath(json.extends, host, newBase, errors, ts.createCompilerDiagnostic);
-            }
-        }
-        return { raw: json, options: options, typeAcquisition: typeAcquisition, extendedConfigPath: extendedConfigPath };
-    }
-    function parseOwnConfigOfJsonSourceFile(sourceFile, host, basePath, configFileName, errors) {
-        var options = getDefaultCompilerOptions(configFileName);
-        var typeAcquisition, typingOptionstypeAcquisition;
-        var extendedConfigPath;
-        var optionsIterator = {
-            onSetValidOptionKeyValueInParent: function (parentOption, option, value) {
-                ts.Debug.assert(parentOption === "compilerOptions" || parentOption === "typeAcquisition" || parentOption === "typingOptions");
-                var currentOption = parentOption === "compilerOptions" ?
-                    options :
-                    parentOption === "typeAcquisition" ?
-                        (typeAcquisition || (typeAcquisition = getDefaultTypeAcquisition(configFileName))) :
-                        (typingOptionstypeAcquisition || (typingOptionstypeAcquisition = getDefaultTypeAcquisition(configFileName)));
-                currentOption[option.name] = normalizeOptionValue(option, basePath, value);
-            },
-            onSetValidOptionKeyValueInRoot: function (key, _keyNode, value, valueNode) {
-                switch (key) {
-                    case "extends":
-                        var newBase = configFileName ? directoryOfCombinedPath(configFileName, basePath) : basePath;
-                        extendedConfigPath = getExtendsConfigPath(value, host, newBase, errors, function (message, arg0) {
-                            return ts.createDiagnosticForNodeInSourceFile(sourceFile, valueNode, message, arg0);
+            var _loop_9 = function (resolved) {
+                var cfg = configFileCache.parseConfigFile(resolved);
+                if (cfg) {
+                    // Watch this file
+                    system.watchFile(resolved, function () {
+                        configFileCache.removeKey(resolved);
+                        invalidateProjectAndScheduleBuilds(resolved);
+                    });
+                    // Update watchers for wildcard directories
+                    if (cfg.configFileSpecs) {
+                        ts.updateWatchingWildcardDirectories(existingWatchersForWildcards, ts.createMapFromTemplate(cfg.configFileSpecs.wildcardDirectories), function (dir, flags) {
+                            return system.watchDirectory(dir, function () {
+                                invalidateProjectAndScheduleBuilds(resolved);
+                            }, !!(flags & 1 /* Recursive */));
                         });
-                        return;
-                    case "files":
-                        if (value.length === 0) {
-                            errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, valueNode, ts.Diagnostics.The_files_list_in_config_file_0_is_empty, configFileName || "tsconfig.json"));
-                        }
-                        return;
+                    }
+                    // Watch input files
+                    for (var _i = 0, _a = cfg.fileNames; _i < _a.length; _i++) {
+                        var input = _a[_i];
+                        system.watchFile(input, function () {
+                            invalidateProjectAndScheduleBuilds(resolved);
+                        });
+                    }
                 }
-            },
-            onSetUnknownOptionKeyValueInRoot: function (key, keyNode, _value, _valueNode) {
-                if (key === "excludes") {
-                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, keyNode, ts.Diagnostics.Unknown_option_excludes_Did_you_mean_exclude));
+            };
+            for (var _i = 0, _a = graph.buildQueue; _i < _a.length; _i++) {
+                var resolved = _a[_i];
+                _loop_9(resolved);
+            }
+            function invalidateProjectAndScheduleBuilds(resolved) {
+                invalidateProject(resolved);
+                system.setTimeout(buildInvalidatedProjects, 100);
+                system.setTimeout(buildDependentInvalidatedProjects, 3000);
+            }
+        }
+        function resetBuildContext(opts) {
+            if (opts === void 0) { opts = defaultOptions; }
+            context = createBuildContext(opts);
+        }
+        function getUpToDateStatusOfFile(configFileName) {
+            return getUpToDateStatus(configFileCache.parseConfigFile(configFileName));
+        }
+        function getBuildGraph(configFileNames) {
+            var resolvedNames = resolveProjectNames(configFileNames);
+            if (resolvedNames === undefined)
+                return undefined;
+            return createDependencyGraph(resolvedNames);
+        }
+        function getGlobalDependencyGraph() {
+            return getBuildGraph(rootNames);
+        }
+        function getUpToDateStatus(project) {
+            if (project === undefined) {
+                return { type: UpToDateStatusType.Unbuildable, reason: "File deleted mid-build" };
+            }
+            var prior = context.projectStatus.getValueOrUndefined(project.options.configFilePath);
+            if (prior !== undefined) {
+                return prior;
+            }
+            var actual = getUpToDateStatusWorker(project);
+            context.projectStatus.setValue(project.options.configFilePath, actual);
+            return actual;
+        }
+        function invalidateProject(configFileName) {
+            var resolved = resolveProjectName(configFileName);
+            if (resolved === undefined) {
+                // If this was a rootName, we need to track it as missing.
+                // Otherwise we can just ignore it and have it possibly surface as an error in any downstream projects,
+                // if they exist
+                // TODO: do those things
+                return;
+            }
+            configFileCache.removeKey(resolved);
+            context.invalidatedProjects.setValue(resolved, true);
+            context.projectStatus.removeKey(resolved);
+            var graph = getGlobalDependencyGraph();
+            if (graph) {
+                queueBuildForDownstreamReferences(resolved);
+            }
+            // Mark all downstream projects of this one needing to be built "later"
+            function queueBuildForDownstreamReferences(root) {
+                debugger;
+                var deps = graph.dependencyMap.getReferencesTo(root);
+                for (var _i = 0, deps_1 = deps; _i < deps_1.length; _i++) {
+                    var ref = deps_1[_i];
+                    // Can skip circular references
+                    if (!context.queuedProjects.hasKey(ref)) {
+                        context.queuedProjects.setValue(ref, true);
+                        queueBuildForDownstreamReferences(ref);
+                    }
                 }
             }
-        };
-        var json = convertToObjectWorker(sourceFile, errors, /*returnValue*/ true, getTsconfigRootOptionsMap(), optionsIterator);
-        if (!typeAcquisition) {
-            if (typingOptionstypeAcquisition) {
-                typeAcquisition = (typingOptionstypeAcquisition.enableAutoDiscovery !== undefined) ?
-                    {
-                        enable: typingOptionstypeAcquisition.enableAutoDiscovery,
-                        include: typingOptionstypeAcquisition.include,
-                        exclude: typingOptionstypeAcquisition.exclude
-                    } :
-                    typingOptionstypeAcquisition;
+        }
+        function buildInvalidatedProjects() {
+            buildSomeProjects(function (p) { return context.invalidatedProjects.hasKey(p); });
+        }
+        function buildDependentInvalidatedProjects() {
+            buildSomeProjects(function (p) { return context.queuedProjects.hasKey(p); });
+        }
+        function buildSomeProjects(predicate) {
+            var resolvedNames = resolveProjectNames(rootNames);
+            if (resolvedNames === undefined)
+                return;
+            var graph = createDependencyGraph(resolvedNames);
+            for (var _i = 0, _a = graph.buildQueue; _i < _a.length; _i++) {
+                var next = _a[_i];
+                if (!predicate(next))
+                    continue;
+                var resolved = resolveProjectName(next);
+                if (!resolved)
+                    continue; // ??
+                var proj = configFileCache.parseConfigFile(resolved);
+                if (!proj)
+                    continue; // ?
+                var status = getUpToDateStatus(proj);
+                verboseReportProjectStatus(next, status);
+                if (status.type === UpToDateStatusType.UpstreamBlocked) {
+                    if (context.options.verbose)
+                        buildHost.verbose(ts.Diagnostics.Skipping_build_of_project_0_because_its_dependency_1_has_errors, resolved, status.upstreamProjectName);
+                    continue;
+                }
+                buildSingleProject(next);
+            }
+        }
+        function getAllProjectOutputs(project) {
+            if (project.options.outFile) {
+                return getOutFileOutputs(project);
             }
             else {
-                typeAcquisition = getDefaultTypeAcquisition(configFileName);
+                var outputs = [];
+                for (var _i = 0, _a = project.fileNames; _i < _a.length; _i++) {
+                    var inputFile = _a[_i];
+                    outputs.push.apply(outputs, getOutputFileNames(inputFile, project));
+                }
+                return outputs;
             }
         }
-        return { raw: json, options: options, typeAcquisition: typeAcquisition, extendedConfigPath: extendedConfigPath };
-    }
-    function getExtendsConfigPath(extendedConfig, host, basePath, errors, createDiagnostic) {
-        extendedConfig = ts.normalizeSlashes(extendedConfig);
-        // If the path isn't a rooted or relative path, don't try to resolve it (we reserve the right to special case module-id like paths in the future)
-        if (!(ts.isRootedDiskPath(extendedConfig) || ts.startsWith(extendedConfig, "./") || ts.startsWith(extendedConfig, "../"))) {
-            errors.push(createDiagnostic(ts.Diagnostics.A_path_in_an_extends_option_must_be_relative_or_rooted_but_0_is_not, extendedConfig));
-            return undefined;
+        function getUpToDateStatusWorker(project) {
+            var newestInputFileName = undefined;
+            var newestInputFileTime = minimumDate;
+            // Get timestamps of input files
+            for (var _i = 0, _a = project.fileNames; _i < _a.length; _i++) {
+                var inputFile = _a[_i];
+                if (!compilerHost.fileExists(inputFile)) {
+                    return {
+                        type: UpToDateStatusType.Unbuildable,
+                        reason: inputFile + " does not exist"
+                    };
+                }
+                var inputTime = compilerHost.getModifiedTime(inputFile);
+                if (inputTime > newestInputFileTime) {
+                    newestInputFileName = inputFile;
+                    newestInputFileTime = inputTime;
+                }
+            }
+            // Collect the expected outputs of this project
+            var outputs = getAllProjectOutputs(project);
+            if (outputs.length === 0) {
+                return {
+                    type: UpToDateStatusType.ContainerOnly
+                };
+            }
+            // Now see if all outputs are newer than the newest input
+            var oldestOutputFileName = "(none)";
+            var oldestOutputFileTime = maximumDate;
+            var newestOutputFileName = "(none)";
+            var newestOutputFileTime = minimumDate;
+            var missingOutputFileName;
+            var newestDeclarationFileContentChangedTime = minimumDate;
+            var isOutOfDateWithInputs = false;
+            for (var _b = 0, outputs_1 = outputs; _b < outputs_1.length; _b++) {
+                var output = outputs_1[_b];
+                // Output is missing; can stop checking
+                // Don't immediately return because we can still be upstream-blocked, which is a higher-priority status
+                if (!compilerHost.fileExists(output)) {
+                    missingOutputFileName = output;
+                    break;
+                }
+                var outputTime = compilerHost.getModifiedTime(output);
+                if (outputTime < oldestOutputFileTime) {
+                    oldestOutputFileTime = outputTime;
+                    oldestOutputFileName = output;
+                }
+                // If an output is older than the newest input, we can stop checking
+                // Don't immediately return because we can still be upstream-blocked, which is a higher-priority status
+                if (outputTime < newestInputFileTime) {
+                    isOutOfDateWithInputs = true;
+                    break;
+                }
+                if (outputTime > newestOutputFileTime) {
+                    newestOutputFileTime = outputTime;
+                    newestOutputFileName = output;
+                }
+                // Keep track of when the most recent time a .d.ts file was changed.
+                // In addition to file timestamps, we also keep track of when a .d.ts file
+                // had its file touched but not had its contents changed - this allows us
+                // to skip a downstream typecheck
+                if (isDeclarationFile(output)) {
+                    var unchangedTime = context.unchangedOutputs.getValueOrUndefined(output);
+                    if (unchangedTime !== undefined) {
+                        newestDeclarationFileContentChangedTime = newer(unchangedTime, newestDeclarationFileContentChangedTime);
+                    }
+                    else {
+                        newestDeclarationFileContentChangedTime = newer(newestDeclarationFileContentChangedTime, compilerHost.getModifiedTime(output));
+                    }
+                }
+            }
+            var pseudoUpToDate = false;
+            if (project.projectReferences) {
+                for (var _c = 0, _d = project.projectReferences; _c < _d.length; _c++) {
+                    var ref = _d[_c];
+                    var resolvedRef = ts.resolveProjectReferencePath(compilerHost, ref);
+                    var refStatus = getUpToDateStatus(configFileCache.parseConfigFile(resolvedRef));
+                    // An upstream project is blocked
+                    if (refStatus.type === UpToDateStatusType.Unbuildable) {
+                        return {
+                            type: UpToDateStatusType.UpstreamBlocked,
+                            upstreamProjectName: ref.path
+                        };
+                    }
+                    // If the upstream project is out of date, then so are we (someone shouldn't have asked, though?)
+                    if (refStatus.type !== UpToDateStatusType.UpToDate) {
+                        return {
+                            type: UpToDateStatusType.UpstreamOutOfDate,
+                            upstreamProjectName: ref.path
+                        };
+                    }
+                    // If the upstream project's newest file is older than our oldest output, we
+                    // can't be out of date because of it
+                    if (refStatus.newestInputFileTime <= oldestOutputFileTime) {
+                        continue;
+                    }
+                    // If the upstream project has only change .d.ts files, and we've built
+                    // *after* those files, then we're "psuedo up to date" and eligible for a fast rebuild
+                    if (refStatus.newestDeclarationFileContentChangedTime <= oldestOutputFileTime) {
+                        pseudoUpToDate = true;
+                        continue;
+                    }
+                    // We have an output older than an upstream output - we are out of date
+                    ts.Debug.assert(oldestOutputFileName !== undefined, "Should have an oldest output filename here");
+                    return {
+                        type: UpToDateStatusType.OutOfDateWithUpstream,
+                        outOfDateOutputFileName: oldestOutputFileName,
+                        newerProjectName: ref.path
+                    };
+                }
+            }
+            if (missingOutputFileName !== undefined) {
+                return {
+                    type: UpToDateStatusType.OutputMissing,
+                    missingOutputFileName: missingOutputFileName
+                };
+            }
+            if (isOutOfDateWithInputs) {
+                return {
+                    type: UpToDateStatusType.OutOfDateWithSelf,
+                    outOfDateOutputFileName: oldestOutputFileName,
+                    newerInputFileName: newestInputFileName
+                };
+            }
+            // Up to date
+            return {
+                type: pseudoUpToDate ? UpToDateStatusType.UpToDateWithUpstreamTypes : UpToDateStatusType.UpToDate,
+                newestDeclarationFileContentChangedTime: newestDeclarationFileContentChangedTime,
+                newestInputFileTime: newestInputFileTime,
+                newestOutputFileTime: newestOutputFileTime,
+                newestInputFileName: newestInputFileName,
+                newestOutputFileName: newestOutputFileName,
+                oldestOutputFileName: oldestOutputFileName
+            };
         }
-        var extendedConfigPath = ts.getNormalizedAbsolutePath(extendedConfig, basePath);
-        if (!host.fileExists(extendedConfigPath) && !ts.endsWith(extendedConfigPath, ".json" /* Json */)) {
-            extendedConfigPath = extendedConfigPath + ".json";
-            if (!host.fileExists(extendedConfigPath)) {
-                errors.push(createDiagnostic(ts.Diagnostics.File_0_does_not_exist, extendedConfig));
+        function createDependencyGraph(roots) {
+            var temporaryMarks = {};
+            var permanentMarks = {};
+            var circularityReportStack = [];
+            var buildOrder = [];
+            var graph = createDependencyMapper();
+            var hadError = false;
+            for (var _i = 0, roots_1 = roots; _i < roots_1.length; _i++) {
+                var root = roots_1[_i];
+                visit(root);
+            }
+            if (hadError) {
                 return undefined;
             }
-        }
-        return extendedConfigPath;
-    }
-    function getExtendedConfig(sourceFile, extendedConfigPath, host, basePath, resolutionStack, errors) {
-        var _a;
-        var extendedResult = readJsonConfigFile(extendedConfigPath, function (path) { return host.readFile(path); });
-        if (sourceFile) {
-            (sourceFile.extendedSourceFiles || (sourceFile.extendedSourceFiles = [])).push(extendedResult.fileName);
-        }
-        if (extendedResult.parseDiagnostics.length) {
-            errors.push.apply(errors, extendedResult.parseDiagnostics);
-            return undefined;
-        }
-        var extendedDirname = ts.getDirectoryPath(extendedConfigPath);
-        var extendedConfig = parseConfig(/*json*/ undefined, extendedResult, host, extendedDirname, ts.getBaseFileName(extendedConfigPath), resolutionStack, errors);
-        if (sourceFile) {
-            (_a = sourceFile.extendedSourceFiles).push.apply(_a, extendedResult.extendedSourceFiles);
-        }
-        if (isSuccessfulParsedTsconfig(extendedConfig)) {
-            // Update the paths to reflect base path
-            var relativeDifference_1 = ts.convertToRelativePath(extendedDirname, basePath, ts.identity);
-            var updatePath_1 = function (path) { return ts.isRootedDiskPath(path) ? path : ts.combinePaths(relativeDifference_1, path); };
-            var mapPropertiesInRawIfNotUndefined = function (propertyName) {
-                if (raw_2[propertyName]) {
-                    raw_2[propertyName] = ts.map(raw_2[propertyName], updatePath_1);
-                }
-            };
-            var raw_2 = extendedConfig.raw;
-            mapPropertiesInRawIfNotUndefined("include");
-            mapPropertiesInRawIfNotUndefined("exclude");
-            mapPropertiesInRawIfNotUndefined("files");
-        }
-        return extendedConfig;
-    }
-    function convertCompileOnSaveOptionFromJson(jsonOption, basePath, errors) {
-        if (!ts.hasProperty(jsonOption, ts.compileOnSaveCommandLineOption.name)) {
-            return false;
-        }
-        var result = convertJsonOption(ts.compileOnSaveCommandLineOption, jsonOption.compileOnSave, basePath, errors);
-        return typeof result === "boolean" && result;
-    }
-    function convertCompilerOptionsFromJson(jsonOptions, basePath, configFileName) {
-        var errors = [];
-        var options = convertCompilerOptionsFromJsonWorker(jsonOptions, basePath, errors, configFileName);
-        return { options: options, errors: errors };
-    }
-    ts.convertCompilerOptionsFromJson = convertCompilerOptionsFromJson;
-    function convertTypeAcquisitionFromJson(jsonOptions, basePath, configFileName) {
-        var errors = [];
-        var options = convertTypeAcquisitionFromJsonWorker(jsonOptions, basePath, errors, configFileName);
-        return { options: options, errors: errors };
-    }
-    ts.convertTypeAcquisitionFromJson = convertTypeAcquisitionFromJson;
-    function getDefaultCompilerOptions(configFileName) {
-        var options = configFileName && ts.getBaseFileName(configFileName) === "jsconfig.json"
-            ? { allowJs: true, maxNodeModuleJsDepth: 2, allowSyntheticDefaultImports: true, skipLibCheck: true, noEmit: true }
-            : {};
-        return options;
-    }
-    function convertCompilerOptionsFromJsonWorker(jsonOptions, basePath, errors, configFileName) {
-        var options = getDefaultCompilerOptions(configFileName);
-        convertOptionsFromJson(ts.optionDeclarations, jsonOptions, basePath, options, ts.Diagnostics.Unknown_compiler_option_0, errors);
-        if (configFileName) {
-            options.configFilePath = ts.normalizeSlashes(configFileName);
-        }
-        return options;
-    }
-    function getDefaultTypeAcquisition(configFileName) {
-        return { enable: !!configFileName && ts.getBaseFileName(configFileName) === "jsconfig.json", include: [], exclude: [] };
-    }
-    function convertTypeAcquisitionFromJsonWorker(jsonOptions, basePath, errors, configFileName) {
-        var options = getDefaultTypeAcquisition(configFileName);
-        var typeAcquisition = convertEnableAutoDiscoveryToEnable(jsonOptions);
-        convertOptionsFromJson(ts.typeAcquisitionDeclarations, typeAcquisition, basePath, options, ts.Diagnostics.Unknown_type_acquisition_option_0, errors);
-        return options;
-    }
-    function convertOptionsFromJson(optionDeclarations, jsonOptions, basePath, defaultOptions, diagnosticMessage, errors) {
-        if (!jsonOptions) {
-            return;
-        }
-        var optionNameMap = commandLineOptionsToMap(optionDeclarations);
-        for (var id in jsonOptions) {
-            var opt = optionNameMap.get(id);
-            if (opt) {
-                defaultOptions[opt.name] = convertJsonOption(opt, jsonOptions[id], basePath, errors);
-            }
-            else {
-                errors.push(ts.createCompilerDiagnostic(diagnosticMessage, id));
-            }
-        }
-    }
-    function convertJsonOption(opt, value, basePath, errors) {
-        if (isCompilerOptionsValue(opt, value)) {
-            var optType = opt.type;
-            if (optType === "list" && ts.isArray(value)) {
-                return convertJsonOptionOfListType(opt, value, basePath, errors);
-            }
-            else if (!ts.isString(optType)) {
-                return convertJsonOptionOfCustomType(opt, value, errors);
-            }
-            return normalizeNonListOptionValue(opt, basePath, value);
-        }
-        else {
-            errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, opt.name, getCompilerOptionValueTypeString(opt)));
-        }
-    }
-    function normalizeOptionValue(option, basePath, value) {
-        if (isNullOrUndefined(value))
-            return undefined;
-        if (option.type === "list") {
-            var listOption_1 = option;
-            if (listOption_1.element.isFilePath || !ts.isString(listOption_1.element.type)) {
-                return ts.filter(ts.map(value, function (v) { return normalizeOptionValue(listOption_1.element, basePath, v); }), function (v) { return !!v; });
-            }
-            return value;
-        }
-        else if (!ts.isString(option.type)) {
-            return option.type.get(ts.isString(value) ? value.toLowerCase() : value);
-        }
-        return normalizeNonListOptionValue(option, basePath, value);
-    }
-    function normalizeNonListOptionValue(option, basePath, value) {
-        if (option.isFilePath) {
-            value = ts.normalizePath(ts.combinePaths(basePath, value));
-            if (value === "") {
-                value = ".";
-            }
-        }
-        return value;
-    }
-    function convertJsonOptionOfCustomType(opt, value, errors) {
-        if (isNullOrUndefined(value))
-            return undefined;
-        var key = value.toLowerCase();
-        var val = opt.type.get(key);
-        if (val !== undefined) {
-            return val;
-        }
-        else {
-            errors.push(createCompilerDiagnosticForInvalidCustomType(opt));
-        }
-    }
-    function convertJsonOptionOfListType(option, values, basePath, errors) {
-        return ts.filter(ts.map(values, function (v) { return convertJsonOption(option.element, v, basePath, errors); }), function (v) { return !!v; });
-    }
-    function trimString(s) {
-        return typeof s.trim === "function" ? s.trim() : s.replace(/^[\s]+|[\s]+$/g, "");
-    }
-    /**
-     * Tests for a path that ends in a recursive directory wildcard.
-     * Matches **, \**, **\, and \**\, but not a**b.
-     *
-     * NOTE: used \ in place of / above to avoid issues with multiline comments.
-     *
-     * Breakdown:
-     *  (^|\/)      # matches either the beginning of the string or a directory separator.
-     *  \*\*        # matches the recursive directory wildcard "**".
-     *  \/?$        # matches an optional trailing directory separator at the end of the string.
-     */
-    var invalidTrailingRecursionPattern = /(^|\/)\*\*\/?$/;
-    /**
-     * Tests for a path where .. appears after a recursive directory wildcard.
-     * Matches **\..\*, **\a\..\*, and **\.., but not ..\**\*
-     *
-     * NOTE: used \ in place of / above to avoid issues with multiline comments.
-     *
-     * Breakdown:
-     *  (^|\/)      # matches either the beginning of the string or a directory separator.
-     *  \*\*\/      # matches a recursive directory wildcard "**" followed by a directory separator.
-     *  (.*\/)?     # optionally matches any number of characters followed by a directory separator.
-     *  \.\.        # matches a parent directory path component ".."
-     *  ($|\/)      # matches either the end of the string or a directory separator.
-     */
-    var invalidDotDotAfterRecursiveWildcardPattern = /(^|\/)\*\*\/(.*\/)?\.\.($|\/)/;
-    /**
-     * Tests for a path containing a wildcard character in a directory component of the path.
-     * Matches \*\, \?\, and \a*b\, but not \a\ or \a\*.
-     *
-     * NOTE: used \ in place of / above to avoid issues with multiline comments.
-     *
-     * Breakdown:
-     *  \/          # matches a directory separator.
-     *  [^/]*?      # matches any number of characters excluding directory separators (non-greedy).
-     *  [*?]        # matches either a wildcard character (* or ?)
-     *  [^/]*       # matches any number of characters excluding directory separators (greedy).
-     *  \/          # matches a directory separator.
-     */
-    var watchRecursivePattern = /\/[^/]*?[*?][^/]*\//;
-    /**
-     * Matches the portion of a wildcard path that does not contain wildcards.
-     * Matches \a of \a\*, or \a\b\c of \a\b\c\?\d.
-     *
-     * NOTE: used \ in place of / above to avoid issues with multiline comments.
-     *
-     * Breakdown:
-     *  ^                   # matches the beginning of the string
-     *  [^*?]*              # matches any number of non-wildcard characters
-     *  (?=\/[^/]*[*?])     # lookahead that matches a directory separator followed by
-     *                      # a path component that contains at least one wildcard character (* or ?).
-     */
-    var wildcardDirectoryPattern = /^[^*?]*(?=\/[^/]*[*?])/;
-    /**
-     * Expands an array of file specifications.
-     *
-     * @param filesSpecs The literal file names to include.
-     * @param includeSpecs The wildcard file specifications to include.
-     * @param excludeSpecs The wildcard file specifications to exclude.
-     * @param basePath The base path for any relative file specifications.
-     * @param options Compiler options.
-     * @param host The host used to resolve files and directories.
-     * @param errors An array for diagnostic reporting.
-     */
-    function matchFileNames(filesSpecs, includeSpecs, excludeSpecs, basePath, options, host, errors, extraFileExtensions, jsonSourceFile) {
-        basePath = ts.normalizePath(basePath);
-        var validatedIncludeSpecs, validatedExcludeSpecs;
-        // The exclude spec list is converted into a regular expression, which allows us to quickly
-        // test whether a file or directory should be excluded before recursively traversing the
-        // file system.
-        if (includeSpecs) {
-            validatedIncludeSpecs = validateSpecs(includeSpecs, errors, /*allowTrailingRecursion*/ false, jsonSourceFile, "include");
-        }
-        if (excludeSpecs) {
-            validatedExcludeSpecs = validateSpecs(excludeSpecs, errors, /*allowTrailingRecursion*/ true, jsonSourceFile, "exclude");
-        }
-        // Wildcard directories (provided as part of a wildcard path) are stored in a
-        // file map that marks whether it was a regular wildcard match (with a `*` or `?` token),
-        // or a recursive directory. This information is used by filesystem watchers to monitor for
-        // new entries in these paths.
-        var wildcardDirectories = getWildcardDirectories(validatedIncludeSpecs, validatedExcludeSpecs, basePath, host.useCaseSensitiveFileNames);
-        var spec = { filesSpecs: filesSpecs, referencesSpecs: undefined, includeSpecs: includeSpecs, excludeSpecs: excludeSpecs, validatedIncludeSpecs: validatedIncludeSpecs, validatedExcludeSpecs: validatedExcludeSpecs, wildcardDirectories: wildcardDirectories };
-        return getFileNamesFromConfigSpecs(spec, basePath, options, host, extraFileExtensions);
-    }
-    /**
-     * Gets the file names from the provided config file specs that contain, files, include, exclude and
-     * other properties needed to resolve the file names
-     * @param spec The config file specs extracted with file names to include, wildcards to include/exclude and other details
-     * @param basePath The base path for any relative file specifications.
-     * @param options Compiler options.
-     * @param host The host used to resolve files and directories.
-     * @param extraFileExtensions optionaly file extra file extension information from host
-     */
-    /* @internal */
-    function getFileNamesFromConfigSpecs(spec, basePath, options, host, extraFileExtensions) {
-        if (extraFileExtensions === void 0) { extraFileExtensions = []; }
-        basePath = ts.normalizePath(basePath);
-        var keyMapper = host.useCaseSensitiveFileNames ? ts.identity : ts.toLowerCase;
-        // Literal file names (provided via the "files" array in tsconfig.json) are stored in a
-        // file map with a possibly case insensitive key. We use this map later when when including
-        // wildcard paths.
-        var literalFileMap = ts.createMap();
-        // Wildcard paths (provided via the "includes" array in tsconfig.json) are stored in a
-        // file map with a possibly case insensitive key. We use this map to store paths matched
-        // via wildcard, and to handle extension priority.
-        var wildcardFileMap = ts.createMap();
-        var filesSpecs = spec.filesSpecs, validatedIncludeSpecs = spec.validatedIncludeSpecs, validatedExcludeSpecs = spec.validatedExcludeSpecs, wildcardDirectories = spec.wildcardDirectories;
-        // Rather than requery this for each file and filespec, we query the supported extensions
-        // once and store it on the expansion context.
-        var supportedExtensions = ts.getSupportedExtensions(options, extraFileExtensions);
-        // Literal files are always included verbatim. An "include" or "exclude" specification cannot
-        // remove a literal file.
-        if (filesSpecs) {
-            for (var _i = 0, filesSpecs_1 = filesSpecs; _i < filesSpecs_1.length; _i++) {
-                var fileName = filesSpecs_1[_i];
-                var file_13 = ts.getNormalizedAbsolutePath(fileName, basePath);
-                literalFileMap.set(keyMapper(file_13), file_13);
-            }
-        }
-        if (validatedIncludeSpecs && validatedIncludeSpecs.length > 0) {
-            for (var _a = 0, _b = host.readDirectory(basePath, supportedExtensions, validatedExcludeSpecs, validatedIncludeSpecs, /*depth*/ undefined); _a < _b.length; _a++) {
-                var file_14 = _b[_a];
-                // If we have already included a literal or wildcard path with a
-                // higher priority extension, we should skip this file.
-                //
-                // This handles cases where we may encounter both <file>.ts and
-                // <file>.d.ts (or <file>.js if "allowJs" is enabled) in the same
-                // directory when they are compilation outputs.
-                if (hasFileWithHigherPriorityExtension(file_14, literalFileMap, wildcardFileMap, supportedExtensions, keyMapper)) {
-                    continue;
-                }
-                // We may have included a wildcard path with a lower priority
-                // extension due to the user-defined order of entries in the
-                // "include" array. If there is a lower priority extension in the
-                // same directory, we should remove it.
-                removeWildcardFilesWithLowerPriorityExtension(file_14, wildcardFileMap, supportedExtensions, keyMapper);
-                var key = keyMapper(file_14);
-                if (!literalFileMap.has(key) && !wildcardFileMap.has(key)) {
-                    wildcardFileMap.set(key, file_14);
-                }
-            }
-        }
-        var literalFiles = ts.arrayFrom(literalFileMap.values());
-        var wildcardFiles = ts.arrayFrom(wildcardFileMap.values());
-        var projectReferences = spec.referencesSpecs && spec.referencesSpecs.map(function (r) {
-            return __assign({}, r, { path: ts.getNormalizedAbsolutePath(r.path, basePath) });
-        });
-        return {
-            fileNames: literalFiles.concat(wildcardFiles),
-            projectReferences: projectReferences,
-            wildcardDirectories: wildcardDirectories,
-            spec: spec
-        };
-    }
-    ts.getFileNamesFromConfigSpecs = getFileNamesFromConfigSpecs;
-    function validateSpecs(specs, errors, allowTrailingRecursion, jsonSourceFile, specKey) {
-        return specs.filter(function (spec) {
-            var diag = specToDiagnostic(spec, allowTrailingRecursion);
-            if (diag !== undefined) {
-                errors.push(createDiagnostic(diag, spec));
-            }
-            return diag === undefined;
-        });
-        function createDiagnostic(message, spec) {
-            var element = ts.getTsConfigPropArrayElementValue(jsonSourceFile, specKey, spec);
-            return element ?
-                ts.createDiagnosticForNodeInSourceFile(jsonSourceFile, element, message, spec) :
-                ts.createCompilerDiagnostic(message, spec);
-        }
-    }
-    function specToDiagnostic(spec, allowTrailingRecursion) {
-        if (!allowTrailingRecursion && invalidTrailingRecursionPattern.test(spec)) {
-            return ts.Diagnostics.File_specification_cannot_end_in_a_recursive_directory_wildcard_Asterisk_Asterisk_Colon_0;
-        }
-        else if (invalidDotDotAfterRecursiveWildcardPattern.test(spec)) {
-            return ts.Diagnostics.File_specification_cannot_contain_a_parent_directory_that_appears_after_a_recursive_directory_wildcard_Asterisk_Asterisk_Colon_0;
-        }
-    }
-    /**
-     * Gets directories in a set of include patterns that should be watched for changes.
-     */
-    function getWildcardDirectories(include, exclude, path, useCaseSensitiveFileNames) {
-        // We watch a directory recursively if it contains a wildcard anywhere in a directory segment
-        // of the pattern:
-        //
-        //  /a/b/**/d   - Watch /a/b recursively to catch changes to any d in any subfolder recursively
-        //  /a/b/*/d    - Watch /a/b recursively to catch any d in any immediate subfolder, even if a new subfolder is added
-        //  /a/b        - Watch /a/b recursively to catch changes to anything in any recursive subfoler
-        //
-        // We watch a directory without recursion if it contains a wildcard in the file segment of
-        // the pattern:
-        //
-        //  /a/b/*      - Watch /a/b directly to catch any new file
-        //  /a/b/a?z    - Watch /a/b directly to catch any new file matching a?z
-        var rawExcludeRegex = ts.getRegularExpressionForWildcard(exclude, path, "exclude");
-        var excludeRegex = rawExcludeRegex && new RegExp(rawExcludeRegex, useCaseSensitiveFileNames ? "" : "i");
-        var wildcardDirectories = {};
-        if (include !== undefined) {
-            var recursiveKeys = [];
-            for (var _i = 0, include_1 = include; _i < include_1.length; _i++) {
-                var file_15 = include_1[_i];
-                var spec = ts.normalizePath(ts.combinePaths(path, file_15));
-                if (excludeRegex && excludeRegex.test(spec)) {
-                    continue;
-                }
-                var match = getWildcardDirectoryFromSpec(spec, useCaseSensitiveFileNames);
-                if (match) {
-                    var key = match.key, flags = match.flags;
-                    var existingFlags = wildcardDirectories[key];
-                    if (existingFlags === undefined || existingFlags < flags) {
-                        wildcardDirectories[key] = flags;
-                        if (flags === 1 /* Recursive */) {
-                            recursiveKeys.push(key);
-                        }
-                    }
-                }
-            }
-            // Remove any subpaths under an existing recursively watched directory.
-            for (var key in wildcardDirectories) {
-                if (ts.hasProperty(wildcardDirectories, key)) {
-                    for (var _a = 0, recursiveKeys_1 = recursiveKeys; _a < recursiveKeys_1.length; _a++) {
-                        var recursiveKey = recursiveKeys_1[_a];
-                        if (key !== recursiveKey && ts.containsPath(recursiveKey, key, path, !useCaseSensitiveFileNames)) {
-                            delete wildcardDirectories[key];
-                        }
-                    }
-                }
-            }
-        }
-        return wildcardDirectories;
-    }
-    function getWildcardDirectoryFromSpec(spec, useCaseSensitiveFileNames) {
-        var match = wildcardDirectoryPattern.exec(spec);
-        if (match) {
             return {
-                key: useCaseSensitiveFileNames ? match[0] : match[0].toLowerCase(),
-                flags: watchRecursivePattern.test(spec) ? 1 /* Recursive */ : 0 /* None */
+                buildQueue: buildOrder,
+                dependencyMap: graph
             };
-        }
-        if (ts.isImplicitGlob(spec)) {
-            return { key: spec, flags: 1 /* Recursive */ };
-        }
-        return undefined;
-    }
-    /**
-     * Determines whether a literal or wildcard file has already been included that has a higher
-     * extension priority.
-     *
-     * @param file The path to the file.
-     * @param extensionPriority The priority of the extension.
-     * @param context The expansion context.
-     */
-    function hasFileWithHigherPriorityExtension(file, literalFiles, wildcardFiles, extensions, keyMapper) {
-        var extensionPriority = ts.getExtensionPriority(file, extensions);
-        var adjustedExtensionPriority = ts.adjustExtensionPriority(extensionPriority, extensions);
-        for (var i = 0 /* Highest */; i < adjustedExtensionPriority; i++) {
-            var higherPriorityExtension = extensions[i];
-            var higherPriorityPath = keyMapper(ts.changeExtension(file, higherPriorityExtension));
-            if (literalFiles.has(higherPriorityPath) || wildcardFiles.has(higherPriorityPath)) {
-                return true;
+            function visit(projPath, inCircularContext) {
+                if (inCircularContext === void 0) { inCircularContext = false; }
+                // Already visited
+                if (permanentMarks[projPath])
+                    return;
+                // Circular
+                if (temporaryMarks[projPath]) {
+                    if (!inCircularContext) {
+                        hadError = true;
+                        buildHost.error(ts.Diagnostics.Project_references_may_not_form_a_circular_graph_Cycle_detected_Colon_0, circularityReportStack.join("\r\n"));
+                        return;
+                    }
+                }
+                temporaryMarks[projPath] = true;
+                circularityReportStack.push(projPath);
+                var parsed = configFileCache.parseConfigFile(projPath);
+                if (parsed === undefined) {
+                    hadError = true;
+                    return;
+                }
+                if (parsed.projectReferences) {
+                    for (var _i = 0, _a = parsed.projectReferences; _i < _a.length; _i++) {
+                        var ref = _a[_i];
+                        var resolvedRefPath = resolveProjectName(ref.path);
+                        if (resolvedRefPath === undefined) {
+                            hadError = true;
+                            break;
+                        }
+                        visit(resolvedRefPath, inCircularContext || ref.circular);
+                        graph.addReference(projPath, resolvedRefPath);
+                    }
+                }
+                circularityReportStack.pop();
+                permanentMarks[projPath] = true;
+                buildOrder.push(projPath);
             }
         }
-        return false;
-    }
-    /**
-     * Removes files included via wildcard expansion with a lower extension priority that have
-     * already been included.
-     *
-     * @param file The path to the file.
-     * @param extensionPriority The priority of the extension.
-     * @param context The expansion context.
-     */
-    function removeWildcardFilesWithLowerPriorityExtension(file, wildcardFiles, extensions, keyMapper) {
-        var extensionPriority = ts.getExtensionPriority(file, extensions);
-        var nextExtensionPriority = ts.getNextLowestExtensionPriority(extensionPriority, extensions);
-        for (var i = nextExtensionPriority; i < extensions.length; i++) {
-            var lowerPriorityExtension = extensions[i];
-            var lowerPriorityPath = keyMapper(ts.changeExtension(file, lowerPriorityExtension));
-            wildcardFiles.delete(lowerPriorityPath);
-        }
-    }
-    /**
-     * Produces a cleaned version of compiler options with personally identifiying info (aka, paths) removed.
-     * Also converts enum values back to strings.
-     */
-    /* @internal */
-    function convertCompilerOptionsForTelemetry(opts) {
-        var out = {};
-        for (var key in opts) {
-            if (opts.hasOwnProperty(key)) {
-                var type = getOptionFromName(key);
-                if (type !== undefined) { // Ignore unknown options
-                    out[key] = getOptionValueWithEmptyStrings(opts[key], type);
+        function buildSingleProject(proj) {
+            if (context.options.dry) {
+                buildHost.message(ts.Diagnostics.A_non_dry_build_would_build_project_0, proj);
+                return BuildResultFlags.Success;
+            }
+            if (context.options.verbose)
+                buildHost.verbose(ts.Diagnostics.Building_project_0, proj);
+            var resultFlags = BuildResultFlags.None;
+            resultFlags |= BuildResultFlags.DeclarationOutputUnchanged;
+            var configFile = configFileCache.parseConfigFile(proj);
+            if (!configFile) {
+                // Failed to read the config file
+                resultFlags |= BuildResultFlags.ConfigFileErrors;
+                context.projectStatus.setValue(proj, { type: UpToDateStatusType.Unbuildable, reason: "Config file errors" });
+                return resultFlags;
+            }
+            if (configFile.fileNames.length === 0) {
+                // Nothing to build - must be a solution file, basically
+                return BuildResultFlags.None;
+            }
+            var programOptions = {
+                projectReferences: configFile.projectReferences,
+                host: compilerHost,
+                rootNames: configFile.fileNames,
+                options: configFile.options
+            };
+            var program = ts.createProgram(programOptions);
+            // Don't emit anything in the presence of syntactic errors or options diagnostics
+            var syntaxDiagnostics = program.getOptionsDiagnostics().concat(program.getSyntacticDiagnostics());
+            if (syntaxDiagnostics.length) {
+                resultFlags |= BuildResultFlags.SyntaxErrors;
+                for (var _i = 0, syntaxDiagnostics_1 = syntaxDiagnostics; _i < syntaxDiagnostics_1.length; _i++) {
+                    var diag = syntaxDiagnostics_1[_i];
+                    buildHost.errorDiagnostic(diag);
+                }
+                context.projectStatus.setValue(proj, { type: UpToDateStatusType.Unbuildable, reason: "Syntactic errors" });
+                return resultFlags;
+            }
+            // Don't emit .d.ts if there are decl file errors
+            if (program.getCompilerOptions().declaration) {
+                var declDiagnostics = program.getDeclarationDiagnostics();
+                if (declDiagnostics.length) {
+                    resultFlags |= BuildResultFlags.DeclarationEmitErrors;
+                    for (var _a = 0, declDiagnostics_1 = declDiagnostics; _a < declDiagnostics_1.length; _a++) {
+                        var diag = declDiagnostics_1[_a];
+                        buildHost.errorDiagnostic(diag);
+                    }
+                    context.projectStatus.setValue(proj, { type: UpToDateStatusType.Unbuildable, reason: "Declaration file errors" });
+                    return resultFlags;
                 }
             }
-        }
-        return out;
-    }
-    ts.convertCompilerOptionsForTelemetry = convertCompilerOptionsForTelemetry;
-    function getOptionValueWithEmptyStrings(value, option) {
-        switch (option.type) {
-            case "object": // "paths". Can't get any useful information from the value since we blank out strings, so just return "".
-                return "";
-            case "string": // Could be any arbitrary string -- use empty string instead.
-                return "";
-            case "number": // Allow numbers, but be sure to check it's actually a number.
-                return typeof value === "number" ? value : "";
-            case "boolean":
-                return typeof value === "boolean" ? value : "";
-            case "list":
-                var elementType_1 = option.element;
-                return ts.isArray(value) ? value.map(function (v) { return getOptionValueWithEmptyStrings(v, elementType_1); }) : "";
-            default:
-                return ts.forEachEntry(option.type, function (optionEnumValue, optionStringValue) {
-                    if (optionEnumValue === value) {
-                        return optionStringValue;
+            // Same as above but now for semantic diagnostics
+            var semanticDiagnostics = program.getSemanticDiagnostics();
+            if (semanticDiagnostics.length) {
+                resultFlags |= BuildResultFlags.TypeErrors;
+                for (var _b = 0, semanticDiagnostics_1 = semanticDiagnostics; _b < semanticDiagnostics_1.length; _b++) {
+                    var diag = semanticDiagnostics_1[_b];
+                    buildHost.errorDiagnostic(diag);
+                }
+                context.projectStatus.setValue(proj, { type: UpToDateStatusType.Unbuildable, reason: "Semantic errors" });
+                return resultFlags;
+            }
+            var newestDeclarationFileContentChangedTime = minimumDate;
+            program.emit(/*targetSourceFile*/ undefined, function (fileName, content, writeBom, onError) {
+                var priorChangeTime;
+                if (isDeclarationFile(fileName) && compilerHost.fileExists(fileName)) {
+                    if (compilerHost.readFile(fileName) === content) {
+                        // Check for unchanged .d.ts files
+                        resultFlags &= ~BuildResultFlags.DeclarationOutputUnchanged;
+                        priorChangeTime = compilerHost.getModifiedTime && compilerHost.getModifiedTime(fileName);
                     }
-                }); // TODO: GH#18217
+                }
+                compilerHost.writeFile(fileName, content, writeBom, onError, ts.emptyArray);
+                if (priorChangeTime !== undefined) {
+                    newestDeclarationFileContentChangedTime = newer(priorChangeTime, newestDeclarationFileContentChangedTime);
+                    context.unchangedOutputs.setValue(fileName, priorChangeTime);
+                }
+            });
+            context.projectStatus.setValue(proj, { type: UpToDateStatusType.UpToDate, newestDeclarationFileContentChangedTime: newestDeclarationFileContentChangedTime });
+            return resultFlags;
+        }
+        function updateOutputTimestamps(proj) {
+            if (context.options.dry) {
+                return buildHost.message(ts.Diagnostics.A_non_dry_build_would_build_project_0, proj.options.configFilePath);
+            }
+            if (context.options.verbose)
+                buildHost.verbose(ts.Diagnostics.Updating_output_timestamps_of_project_0, proj.options.configFilePath);
+            var now = new Date();
+            var outputs = getAllProjectOutputs(proj);
+            var priorNewestUpdateTime = minimumDate;
+            for (var _i = 0, outputs_2 = outputs; _i < outputs_2.length; _i++) {
+                var file = outputs_2[_i];
+                if (isDeclarationFile(file)) {
+                    priorNewestUpdateTime = newer(priorNewestUpdateTime, compilerHost.getModifiedTime(file));
+                }
+                compilerHost.setModifiedTime(file, now);
+            }
+            context.projectStatus.setValue(proj.options.configFilePath, { type: UpToDateStatusType.UpToDate, newestDeclarationFileContentChangedTime: priorNewestUpdateTime });
+        }
+        function getFilesToClean(configFileNames) {
+            var resolvedNames = resolveProjectNames(configFileNames);
+            if (resolvedNames === undefined)
+                return undefined;
+            // Get the same graph for cleaning we'd use for building
+            var graph = createDependencyGraph(resolvedNames);
+            if (graph === undefined)
+                return undefined;
+            var filesToDelete = [];
+            for (var _i = 0, _a = graph.buildQueue; _i < _a.length; _i++) {
+                var proj = _a[_i];
+                var parsed = configFileCache.parseConfigFile(proj);
+                if (parsed === undefined) {
+                    // File has gone missing; fine to ignore here
+                    continue;
+                }
+                var outputs = getAllProjectOutputs(parsed);
+                for (var _b = 0, outputs_3 = outputs; _b < outputs_3.length; _b++) {
+                    var output = outputs_3[_b];
+                    if (compilerHost.fileExists(output)) {
+                        filesToDelete.push(output);
+                    }
+                }
+            }
+            return filesToDelete;
+        }
+        function getAllProjectsInScope() {
+            var resolvedNames = resolveProjectNames(rootNames);
+            if (resolvedNames === undefined)
+                return undefined;
+            var graph = createDependencyGraph(resolvedNames);
+            if (graph === undefined)
+                return undefined;
+            return graph.buildQueue;
+        }
+        function cleanAllProjects() {
+            var resolvedNames = getAllProjectsInScope();
+            if (resolvedNames === undefined) {
+                return buildHost.message(ts.Diagnostics.Skipping_clean_because_not_all_projects_could_be_located);
+            }
+            var filesToDelete = getFilesToClean(resolvedNames);
+            if (filesToDelete === undefined) {
+                return buildHost.message(ts.Diagnostics.Skipping_clean_because_not_all_projects_could_be_located);
+            }
+            if (context.options.dry) {
+                return buildHost.message(ts.Diagnostics.A_non_dry_build_would_delete_the_following_files_Colon_0, filesToDelete.map(function (f) { return "\r\n * " + f; }).join(""));
+            }
+            // Do this check later to allow --clean --dry to function even if the host can't delete files
+            if (!compilerHost.deleteFile) {
+                throw new Error("Host does not support deleting files");
+            }
+            for (var _i = 0, filesToDelete_1 = filesToDelete; _i < filesToDelete_1.length; _i++) {
+                var output = filesToDelete_1[_i];
+                compilerHost.deleteFile(output);
+            }
+        }
+        function resolveProjectName(name) {
+            var fullPath = ts.resolvePath(compilerHost.getCurrentDirectory(), name);
+            if (compilerHost.fileExists(fullPath)) {
+                return fullPath;
+            }
+            var fullPathWithTsconfig = ts.combinePaths(fullPath, "tsconfig.json");
+            if (compilerHost.fileExists(fullPathWithTsconfig)) {
+                return fullPathWithTsconfig;
+            }
+            buildHost.error(ts.Diagnostics.File_0_not_found, relName(fullPath));
+            return undefined;
+        }
+        function resolveProjectNames(configFileNames) {
+            var resolvedNames = [];
+            for (var _i = 0, configFileNames_1 = configFileNames; _i < configFileNames_1.length; _i++) {
+                var name = configFileNames_1[_i];
+                var resolved = resolveProjectName(name);
+                if (resolved === undefined) {
+                    return undefined;
+                }
+                resolvedNames.push(resolved);
+            }
+            return resolvedNames;
+        }
+        function buildAllProjects() {
+            var graph = getGlobalDependencyGraph();
+            if (graph === undefined)
+                return;
+            var queue = graph.buildQueue;
+            reportBuildQueue(graph);
+            for (var _i = 0, queue_1 = queue; _i < queue_1.length; _i++) {
+                var next = queue_1[_i];
+                var proj = configFileCache.parseConfigFile(next);
+                if (proj === undefined) {
+                    break;
+                }
+                var status = getUpToDateStatus(proj);
+                verboseReportProjectStatus(next, status);
+                var projName = proj.options.configFilePath;
+                if (status.type === UpToDateStatusType.UpToDate && !context.options.force) {
+                    // Up to date, skip
+                    if (defaultOptions.dry) {
+                        // In a dry build, inform the user of this fact
+                        buildHost.message(ts.Diagnostics.Project_0_is_up_to_date, projName);
+                    }
+                    continue;
+                }
+                if (status.type === UpToDateStatusType.UpToDateWithUpstreamTypes && !context.options.force) {
+                    // Fake build
+                    updateOutputTimestamps(proj);
+                    continue;
+                }
+                if (status.type === UpToDateStatusType.UpstreamBlocked) {
+                    if (context.options.verbose)
+                        buildHost.verbose(ts.Diagnostics.Skipping_build_of_project_0_because_its_dependency_1_has_errors, projName, status.upstreamProjectName);
+                    continue;
+                }
+                if (status.type === UpToDateStatusType.ContainerOnly) {
+                    // Do nothing
+                    continue;
+                }
+                buildSingleProject(next);
+            }
+        }
+        /**
+         * Report the build ordering inferred from the current project graph if we're in verbose mode
+         */
+        function reportBuildQueue(graph) {
+            if (!context.options.verbose)
+                return;
+            var names = [];
+            for (var _i = 0, _a = graph.buildQueue; _i < _a.length; _i++) {
+                var name = _a[_i];
+                names.push(name);
+            }
+            if (context.options.verbose)
+                buildHost.verbose(ts.Diagnostics.Projects_in_this_build_Colon_0, names.map(function (s) { return "\r\n    * " + relName(s); }).join(""));
+        }
+        function relName(path) {
+            return ts.convertToRelativePath(path, compilerHost.getCurrentDirectory(), function (f) { return compilerHost.getCanonicalFileName(f); });
+        }
+        /**
+         * Report the up-to-date status of a project if we're in verbose mode
+         */
+        function verboseReportProjectStatus(configFileName, status) {
+            if (!context.options.verbose)
+                return;
+            switch (status.type) {
+                case UpToDateStatusType.OutOfDateWithSelf:
+                    return buildHost.verbose(ts.Diagnostics.Project_0_is_out_of_date_because_oldest_output_1_is_older_than_newest_input_2, relName(configFileName), relName(status.outOfDateOutputFileName), relName(status.newerInputFileName));
+                case UpToDateStatusType.OutOfDateWithUpstream:
+                    return buildHost.verbose(ts.Diagnostics.Project_0_is_out_of_date_because_oldest_output_1_is_older_than_newest_input_2, relName(configFileName), relName(status.outOfDateOutputFileName), relName(status.newerProjectName));
+                case UpToDateStatusType.OutputMissing:
+                    return buildHost.verbose(ts.Diagnostics.Project_0_is_out_of_date_because_output_file_1_does_not_exist, relName(configFileName), relName(status.missingOutputFileName));
+                case UpToDateStatusType.UpToDate:
+                    if (status.newestInputFileTime !== undefined) {
+                        return buildHost.verbose(ts.Diagnostics.Project_0_is_up_to_date_because_newest_input_1_is_older_than_oldest_output_2, relName(configFileName), relName(status.newestInputFileName), relName(status.oldestOutputFileName));
+                    }
+                    // Don't report anything for "up to date because it was already built" -- too verbose
+                    break;
+                case UpToDateStatusType.UpToDateWithUpstreamTypes:
+                    return buildHost.verbose(ts.Diagnostics.Project_0_is_up_to_date_with_d_ts_files_from_its_dependencies, relName(configFileName));
+                case UpToDateStatusType.UpstreamOutOfDate:
+                    return buildHost.verbose(ts.Diagnostics.Project_0_is_out_of_date_because_its_dependency_1_is_out_of_date, relName(configFileName), relName(status.upstreamProjectName));
+                case UpToDateStatusType.UpstreamBlocked:
+                    return buildHost.verbose(ts.Diagnostics.Project_0_can_t_be_built_because_its_dependency_1_has_errors, relName(configFileName), relName(status.upstreamProjectName));
+                case UpToDateStatusType.Unbuildable:
+                    return buildHost.verbose(ts.Diagnostics.Failed_to_parse_file_0_Colon_1, relName(configFileName), status.reason);
+                case UpToDateStatusType.ContainerOnly:
+                    // Don't report status on "solution" projects
+                    break;
+                default:
+                    ts.assertTypeIsNever(status);
+            }
         }
     }
+    ts.createSolutionBuilder = createSolutionBuilder;
 })(ts || (ts = {}));
+//# sourceMappingURL=compiler.js.map
+"use strict";
+var __assign = (this && this.__assign) || Object.assign || function(t) {
+    for (var s, i = 1, n = arguments.length; i < n; i++) {
+        s = arguments[i];
+        for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
+            t[p] = s[p];
+    }
+    return t;
+};
+var __extends = (this && this.__extends) || (function () {
+    var extendStatics = Object.setPrototypeOf ||
+        ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
+        function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
+    return function (d, b) {
+        extendStatics(d, b);
+        function __() { this.constructor = d; }
+        d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
+    };
+})();
 var ts;
 (function (ts) {
     var ScriptSnapshot;
@@ -85441,8 +87054,8 @@ var ts;
      * Gets the token whose text has range [start, end) and
      * position >= start and (position < end or (position === end && token is literal or keyword or identifier))
      */
-    function getTouchingPropertyName(sourceFile, position, includeJsDocComment) {
-        return getTouchingToken(sourceFile, position, includeJsDocComment, function (n) { return ts.isPropertyNameLiteral(n) || ts.isKeyword(n.kind); });
+    function getTouchingPropertyName(sourceFile, position) {
+        return getTouchingToken(sourceFile, position, /*includeJsDocComment*/ true, function (n) { return ts.isPropertyNameLiteral(n) || ts.isKeyword(n.kind); });
     }
     ts.getTouchingPropertyName = getTouchingPropertyName;
     /**
@@ -85519,8 +87132,8 @@ var ts;
                 return n;
             }
             var children = n.getChildren();
-            for (var _i = 0, children_3 = children; _i < children_3.length; _i++) {
-                var child = children_3[_i];
+            for (var _i = 0, children_1 = children; _i < children_1.length; _i++) {
+                var child = children_1[_i];
                 var shouldDiveInChildNode = 
                 // previous token is enclosed somewhere in the child
                 (child.pos <= previousToken.pos && child.end > previousToken.end) ||
@@ -85995,18 +87608,37 @@ var ts;
         return ts.createGetCanonicalFileName(hostUsesCaseSensitiveFileNames(host));
     }
     ts.hostGetCanonicalFileName = hostGetCanonicalFileName;
-    function makeImportIfNecessary(defaultImport, namedImports, moduleSpecifier, preferences) {
-        return defaultImport || namedImports && namedImports.length ? makeImport(defaultImport, namedImports, moduleSpecifier, preferences) : undefined;
+    function makeImportIfNecessary(defaultImport, namedImports, moduleSpecifier, quotePreference) {
+        return defaultImport || namedImports && namedImports.length ? makeImport(defaultImport, namedImports, moduleSpecifier, quotePreference) : undefined;
     }
     ts.makeImportIfNecessary = makeImportIfNecessary;
-    function makeImport(defaultImport, namedImports, moduleSpecifier, preferences) {
+    function makeImport(defaultImport, namedImports, moduleSpecifier, quotePreference) {
         return ts.createImportDeclaration(
         /*decorators*/ undefined, 
         /*modifiers*/ undefined, defaultImport || namedImports
             ? ts.createImportClause(defaultImport, namedImports && namedImports.length ? ts.createNamedImports(namedImports) : undefined)
-            : undefined, typeof moduleSpecifier === "string" ? ts.createLiteral(moduleSpecifier, preferences.quotePreference === "single") : moduleSpecifier);
+            : undefined, typeof moduleSpecifier === "string" ? makeStringLiteral(moduleSpecifier, quotePreference) : moduleSpecifier);
     }
     ts.makeImport = makeImport;
+    function makeStringLiteral(text, quotePreference) {
+        return ts.createLiteral(text, quotePreference === 0 /* Single */);
+    }
+    ts.makeStringLiteral = makeStringLiteral;
+    var QuotePreference;
+    (function (QuotePreference) {
+        QuotePreference[QuotePreference["Single"] = 0] = "Single";
+        QuotePreference[QuotePreference["Double"] = 1] = "Double";
+    })(QuotePreference = ts.QuotePreference || (ts.QuotePreference = {}));
+    function getQuotePreference(sourceFile, preferences) {
+        if (preferences.quotePreference) {
+            return preferences.quotePreference === "single" ? 0 /* Single */ : 1 /* Double */;
+        }
+        else {
+            var firstModuleSpecifier = ts.firstOrUndefined(sourceFile.imports);
+            return !!firstModuleSpecifier && !ts.isStringDoubleQuoted(firstModuleSpecifier, sourceFile) ? 0 /* Single */ : 1 /* Double */;
+        }
+    }
+    ts.getQuotePreference = getQuotePreference;
     function symbolNameNoDefault(symbol) {
         var escaped = symbolEscapedNameNoDefault(symbol);
         return escaped === undefined ? undefined : ts.unescapeLeadingUnderscores(escaped);
@@ -86364,14 +87996,14 @@ var ts;
         var visited = ts.visitEachChild(node, getSynthesizedDeepClone, ts.nullTransformationContext);
         if (visited === node) {
             // This only happens for leaf nodes - internal nodes always see their children change.
-            var clone_7 = ts.getSynthesizedClone(node);
-            if (ts.isStringLiteral(clone_7)) {
-                clone_7.textSourceNode = node;
+            var clone_1 = ts.getSynthesizedClone(node);
+            if (ts.isStringLiteral(clone_1)) {
+                clone_1.textSourceNode = node;
             }
-            else if (ts.isNumericLiteral(clone_7)) {
-                clone_7.numericLiteralFlags = node.numericLiteralFlags;
+            else if (ts.isNumericLiteral(clone_1)) {
+                clone_1.numericLiteralFlags = node.numericLiteralFlags;
             }
-            return ts.setTextRange(clone_7, node);
+            return ts.setTextRange(clone_1, node);
         }
         // PERF: As an optimization, rather than calling getSynthesizedClone, we'll update
         // the new node created by visitEachChild with the extra changes getSynthesizedClone
@@ -86712,7 +88344,7 @@ var ts;
         var lastEnd = 0;
         for (var i = 0; i < dense.length; i += 3) {
             var start = dense[i];
-            var length_5 = dense[i + 1];
+            var length_1 = dense[i + 1];
             var type = dense[i + 2];
             // Make a whitespace entry between the last item and this one.
             if (lastEnd >= 0) {
@@ -86721,8 +88353,8 @@ var ts;
                     entries.push({ length: whitespaceLength_1, classification: ts.TokenClass.Whitespace });
                 }
             }
-            entries.push({ length: length_5, classification: convertClassification(type) });
-            lastEnd = start + length_5;
+            entries.push({ length: length_1, classification: convertClassification(type) });
+            lastEnd = start + length_1;
         }
         var whitespaceLength = text.length - lastEnd;
         if (whitespaceLength > 0) {
@@ -87454,8 +89086,8 @@ var ts;
                          * both foo.ts and foo.tsx become foo
                          */
                         var foundFiles = ts.createMap();
-                        for (var _i = 0, files_3 = files; _i < files_3.length; _i++) {
-                            var filePath = files_3[_i];
+                        for (var _i = 0, files_1 = files; _i < files_1.length; _i++) {
+                            var filePath = files_1[_i];
                             filePath = ts.normalizePath(filePath);
                             if (exclude && ts.comparePaths(filePath, exclude, scriptPath, ignoreCase) === 0 /* EqualTo */) {
                                 continue;
@@ -87473,8 +89105,8 @@ var ts;
                     var directories = tryGetDirectories(host, baseDirectory);
                     if (directories) {
                         for (var _a = 0, directories_1 = directories; _a < directories_1.length; _a++) {
-                            var directory_2 = directories_1[_a];
-                            var directoryName = ts.getBaseFileName(ts.normalizePath(directory_2));
+                            var directory = directories_1[_a];
+                            var directoryName = ts.getBaseFileName(ts.normalizePath(directory));
                             if (directoryName !== "@types") {
                                 result.push(nameAndKind(directoryName, "directory" /* directory */));
                             }
@@ -87501,7 +89133,7 @@ var ts;
                     for (var path in paths) {
                         var patterns = paths[path];
                         if (paths.hasOwnProperty(path) && patterns) {
-                            var _loop_12 = function (name, kind) {
+                            var _loop_1 = function (name, kind) {
                                 // Path mappings may provide a duplicate way to get to something we've already added, so don't add again.
                                 if (!result.some(function (entry) { return entry.name === name; })) {
                                     result.push(nameAndKind(name, kind));
@@ -87509,7 +89141,7 @@ var ts;
                             };
                             for (var _i = 0, _a = getCompletionsForPathMapping(path, patterns, fragment, baseUrl, fileExtensions, host); _i < _a.length; _i++) {
                                 var _b = _a[_i], name = _b.name, kind = _b.kind;
-                                _loop_12(name, kind);
+                                _loop_1(name, kind);
                             }
                         }
                     }
@@ -87525,7 +89157,7 @@ var ts;
                     // (But do if we didn't find anything, e.g. 'package.json' missing.)
                     var foundGlobal = false;
                     if (fragmentDirectory === undefined) {
-                        var _loop_13 = function (moduleName) {
+                        var _loop_2 = function (moduleName) {
                             if (!result.some(function (entry) { return entry.name === moduleName; })) {
                                 foundGlobal = true;
                                 result.push(nameAndKind(moduleName, "external module name" /* externalModuleName */));
@@ -87533,7 +89165,7 @@ var ts;
                         };
                         for (var _e = 0, _f = enumerateNodeModulesVisibleToScript(host, scriptPath); _e < _f.length; _e++) {
                             var moduleName = _f[_e];
-                            _loop_13(moduleName);
+                            _loop_2(moduleName);
                         }
                     }
                     if (!foundGlobal) {
@@ -87651,8 +89283,8 @@ var ts;
                     }
                     catch ( /* Wrap in try catch because getEffectiveTypeRoots touches the filesystem */_b) { /* Wrap in try catch because getEffectiveTypeRoots touches the filesystem */ }
                     if (typeRoots) {
-                        for (var _c = 0, typeRoots_2 = typeRoots; _c < typeRoots_2.length; _c++) {
-                            var root = typeRoots_2[_c];
+                        for (var _c = 0, typeRoots_1 = typeRoots; _c < typeRoots_1.length; _c++) {
+                            var root = typeRoots_1[_c];
                             getCompletionEntriesFromDirectories(root);
                         }
                     }
@@ -87875,7 +89507,7 @@ var ts;
             return { isGlobalCompletion: false, isMemberCompletion: false, isNewIdentifierLocation: false, entries: entries };
         }
         function completionInfoFromData(sourceFile, typeChecker, compilerOptions, log, completionData, preferences) {
-            var symbols = completionData.symbols, completionKind = completionData.completionKind, isInSnippetScope = completionData.isInSnippetScope, isNewIdentifierLocation = completionData.isNewIdentifierLocation, location = completionData.location, propertyAccessToConvert = completionData.propertyAccessToConvert, keywordFilters = completionData.keywordFilters, symbolToOriginInfoMap = completionData.symbolToOriginInfoMap, recommendedCompletion = completionData.recommendedCompletion, isJsxInitializer = completionData.isJsxInitializer;
+            var symbols = completionData.symbols, completionKind = completionData.completionKind, isInSnippetScope = completionData.isInSnippetScope, isNewIdentifierLocation = completionData.isNewIdentifierLocation, location = completionData.location, propertyAccessToConvert = completionData.propertyAccessToConvert, keywordFilters = completionData.keywordFilters, literals = completionData.literals, symbolToOriginInfoMap = completionData.symbolToOriginInfoMap, recommendedCompletion = completionData.recommendedCompletion, isJsxInitializer = completionData.isJsxInitializer;
             if (sourceFile.languageVariant === 1 /* JSX */ && location && location.parent && ts.isJsxClosingElement(location.parent)) {
                 // In the TypeScript JSX element, if such element is not defined. When users query for completion at closing tag,
                 // instead of simply giving unknown value, the completion will return the tag-name of an associated opening-element.
@@ -87910,6 +89542,10 @@ var ts;
             if (keywordFilters !== 0 /* None */ || !isMemberCompletion) {
                 ts.addRange(entries, getKeywordCompletions(keywordFilters));
             }
+            for (var _i = 0, literals_1 = literals; _i < literals_1.length; _i++) {
+                var literal = literals_1[_i];
+                entries.push(createCompletionEntryForLiteral(literal));
+            }
             return { isGlobalCompletion: isInSnippetScope, isMemberCompletion: isMemberCompletion, isNewIdentifierLocation: isNewIdentifierLocation, entries: entries };
         }
         function isUncheckedFile(sourceFile, compilerOptions) {
@@ -87942,6 +89578,10 @@ var ts;
                 }
             });
         }
+        var completionNameForLiteral = JSON.stringify;
+        function createCompletionEntryForLiteral(literal) {
+            return { name: completionNameForLiteral(literal), kind: "string" /* string */, kindModifiers: "" /* none */, sortText: "0" };
+        }
         function createCompletionEntry(symbol, location, sourceFile, typeChecker, target, kind, origin, recommendedCompletion, propertyAccessToConvert, isJsxInitializer, preferences) {
             var info = getCompletionEntryDisplayNameForSymbol(symbol, target, origin, kind);
             if (!info) {
@@ -88021,8 +89661,8 @@ var ts;
             // Based on the order we add things we will always see locals first, then globals, then module exports.
             // So adding a completion for a local will prevent us from adding completions for external module exports sharing the same name.
             var uniques = ts.createMap();
-            for (var _i = 0, symbols_4 = symbols; _i < symbols_4.length; _i++) {
-                var symbol = symbols_4[_i];
+            for (var _i = 0, symbols_1 = symbols; _i < symbols_1.length; _i++) {
+                var symbol = symbols_1[_i];
                 var origin = symbolToOriginInfoMap ? symbolToOriginInfoMap[ts.getSymbolId(symbol)] : undefined;
                 var entry = createCompletionEntry(symbol, location, sourceFile, typeChecker, target, kind, origin, recommendedCompletion, propertyAccessToConvert, isJsxInitializer, preferences);
                 if (!entry) {
@@ -88082,7 +89722,7 @@ var ts;
                 case 178 /* LiteralType */:
                     switch (node.parent.parent.kind) {
                         case 162 /* TypeReference */:
-                            return { kind: 2 /* Types */, types: getStringLiteralTypes(typeChecker.getTypeArgumentConstraint(node.parent), typeChecker), isNewIdentifier: false };
+                            return { kind: 2 /* Types */, types: getStringLiteralTypes(typeChecker.getTypeArgumentConstraint(node.parent)), isNewIdentifier: false };
                         case 176 /* IndexedAccessType */:
                             // Get all apparent property names
                             // i.e. interface Foo {
@@ -88152,7 +89792,7 @@ var ts;
             function fromContextualType() {
                 // Get completion for string literal from string literal type
                 // i.e. var x: "hi" | "hello" = "/*completion position*/"
-                return { kind: 2 /* Types */, types: getStringLiteralTypes(getContextualTypeFromParent(node, typeChecker), typeChecker), isNewIdentifier: false };
+                return { kind: 2 /* Types */, types: getStringLiteralTypes(getContextualTypeFromParent(node, typeChecker)), isNewIdentifier: false };
             }
         }
         function getStringLiteralCompletionsFromSignature(argumentInfo, checker) {
@@ -88165,20 +89805,20 @@ var ts;
                     return;
                 var type = checker.getParameterType(candidate, argumentInfo.argumentIndex);
                 isNewIdentifier = isNewIdentifier || !!(type.flags & 4 /* String */);
-                return getStringLiteralTypes(type, checker, uniques);
+                return getStringLiteralTypes(type, uniques);
             });
             return { kind: 2 /* Types */, types: types, isNewIdentifier: isNewIdentifier };
         }
         function stringLiteralCompletionsFromProperties(type) {
             return type && { kind: 1 /* Properties */, symbols: type.getApparentProperties(), hasIndexSignature: hasIndexSignature(type) };
         }
-        function getStringLiteralTypes(type, typeChecker, uniques) {
+        function getStringLiteralTypes(type, uniques) {
             if (uniques === void 0) { uniques = ts.createMap(); }
             if (!type)
                 return ts.emptyArray;
             type = ts.skipConstraint(type);
             return type.isUnion()
-                ? ts.flatMap(type.types, function (t) { return getStringLiteralTypes(t, typeChecker, uniques); })
+                ? ts.flatMap(type.types, function (t) { return getStringLiteralTypes(t, uniques); })
                 : type.isStringLiteral() && !(type.flags & 512 /* EnumLiteral */) && ts.addToSeen(uniques, type.value)
                     ? [type]
                     : ts.emptyArray;
@@ -88192,7 +89832,10 @@ var ts;
             if (completionData.kind !== 0 /* Data */) {
                 return { type: "request", request: completionData };
             }
-            var symbols = completionData.symbols, location = completionData.location, completionKind = completionData.completionKind, symbolToOriginInfoMap = completionData.symbolToOriginInfoMap, previousToken = completionData.previousToken, isJsxInitializer = completionData.isJsxInitializer;
+            var symbols = completionData.symbols, literals = completionData.literals, location = completionData.location, completionKind = completionData.completionKind, symbolToOriginInfoMap = completionData.symbolToOriginInfoMap, previousToken = completionData.previousToken, isJsxInitializer = completionData.isJsxInitializer;
+            var literal = ts.find(literals, function (l) { return completionNameForLiteral(l) === entryId.name; });
+            if (literal !== undefined)
+                return { type: "literal", literal: literal };
             // Find the symbol with the matching entry name.
             // We don't need to perform character checks here because we're only comparing the
             // name against 'entryName' (which is known to be good), not building a new
@@ -88244,12 +89887,21 @@ var ts;
                     var _a = getCompletionEntryCodeActionsAndSourceDisplay(symbolToOriginInfoMap, symbol, program, typeChecker, host, compilerOptions, sourceFile, previousToken, formatContext, getCanonicalFileName, program.getSourceFiles(), preferences), codeActions = _a.codeActions, sourceDisplay = _a.sourceDisplay;
                     return createCompletionDetailsForSymbol(symbol, typeChecker, sourceFile, location, cancellationToken, codeActions, sourceDisplay); // TODO: GH#18217
                 }
+                case "literal": {
+                    var literal = symbolCompletion.literal;
+                    return createSimpleDetails(completionNameForLiteral(literal), "string" /* string */, typeof literal === "string" ? ts.SymbolDisplayPartKind.stringLiteral : ts.SymbolDisplayPartKind.numericLiteral);
+                }
                 case "none":
                     // Didn't find a symbol with this name.  See if we can find a keyword instead.
-                    return allKeywordsCompletions().some(function (c) { return c.name === name; }) ? createCompletionDetails(name, "" /* none */, "keyword" /* keyword */, [ts.displayPart(name, ts.SymbolDisplayPartKind.keyword)]) : undefined;
+                    return allKeywordsCompletions().some(function (c) { return c.name === name; }) ? createSimpleDetails(name, "keyword" /* keyword */, ts.SymbolDisplayPartKind.keyword) : undefined;
+                default:
+                    ts.Debug.assertNever(symbolCompletion);
             }
         }
         Completions.getCompletionEntryDetails = getCompletionEntryDetails;
+        function createSimpleDetails(name, kind, kind2) {
+            return createCompletionDetails(name, "" /* none */, kind, [ts.displayPart(name, kind2)]);
+        }
         function createCompletionDetailsForSymbol(symbol, checker, sourceFile, location, cancellationToken, codeActions, sourceDisplay) {
             var _a = checker.runWithCancellationToken(cancellationToken, function (checker) {
                 return ts.SymbolDisplay.getSymbolDisplayPartsDocumentationAndSymbolKind(checker, symbol, sourceFile, location, location, 7 /* All */);
@@ -88306,22 +89958,21 @@ var ts;
             CompletionKind[CompletionKind["String"] = 4] = "String";
             CompletionKind[CompletionKind["None"] = 5] = "None";
         })(CompletionKind || (CompletionKind = {}));
-        function getRecommendedCompletion(currentToken, position, sourceFile, checker) {
-            var contextualType = getContextualType(currentToken, position, sourceFile, checker);
+        function getRecommendedCompletion(previousToken, contextualType, checker) {
             // For a union, return the first one with a recommended completion.
             return ts.firstDefined(contextualType && (contextualType.isUnion() ? contextualType.types : [contextualType]), function (type) {
                 var symbol = type && type.symbol;
                 // Don't include make a recommended completion for an abstract class
                 return symbol && (symbol.flags & (8 /* EnumMember */ | 384 /* Enum */ | 32 /* Class */) && !ts.isAbstractConstructorSymbol(symbol))
-                    ? getFirstSymbolInChain(symbol, currentToken, checker)
+                    ? getFirstSymbolInChain(symbol, previousToken, checker)
                     : undefined;
             });
         }
-        function getContextualType(currentToken, position, sourceFile, checker) {
-            var parent = currentToken.parent;
-            switch (currentToken.kind) {
+        function getContextualType(previousToken, position, sourceFile, checker) {
+            var parent = previousToken.parent;
+            switch (previousToken.kind) {
                 case 71 /* Identifier */:
-                    return getContextualTypeFromParent(currentToken, checker);
+                    return getContextualTypeFromParent(previousToken, checker);
                 case 58 /* EqualsToken */:
                     switch (parent.kind) {
                         case 232 /* VariableDeclaration */:
@@ -88340,14 +89991,14 @@ var ts;
                 case 17 /* OpenBraceToken */:
                     return ts.isJsxExpression(parent) && parent.parent.kind !== 255 /* JsxElement */ ? checker.getContextualTypeForJsxAttribute(parent.parent) : undefined;
                 default:
-                    var argInfo = ts.SignatureHelp.getArgumentInfoForCompletions(currentToken, position, sourceFile);
+                    var argInfo = ts.SignatureHelp.getArgumentInfoForCompletions(previousToken, position, sourceFile);
                     return argInfo
                         // At `,`, treat this as the next argument after the comma.
-                        ? checker.getContextualTypeForArgumentAtIndex(argInfo.invocation, argInfo.argumentIndex + (currentToken.kind === 26 /* CommaToken */ ? 1 : 0))
-                        : isEqualityOperatorKind(currentToken.kind) && ts.isBinaryExpression(parent) && isEqualityOperatorKind(parent.operatorToken.kind)
+                        ? checker.getContextualTypeForArgumentAtIndex(argInfo.invocation, argInfo.argumentIndex + (previousToken.kind === 26 /* CommaToken */ ? 1 : 0))
+                        : isEqualityOperatorKind(previousToken.kind) && ts.isBinaryExpression(parent) && isEqualityOperatorKind(parent.operatorToken.kind)
                             // completion at `x ===/**/` should be for the right side
                             ? checker.getTypeAtLocation(parent.left)
-                            : checker.getContextualType(currentToken);
+                            : checker.getContextualType(previousToken);
             }
         }
         function getContextualTypeFromParent(node, checker) {
@@ -88459,9 +90110,9 @@ var ts;
             // Check if the caret is at the end of an identifier; this is a partial identifier that we want to complete: e.g. a.toS|
             // Skip this partial identifier and adjust the contextToken to the token that precedes it.
             if (contextToken && position <= contextToken.end && (ts.isIdentifier(contextToken) || ts.isKeyword(contextToken.kind))) {
-                var start_4 = ts.timestamp();
+                var start_1 = ts.timestamp();
                 contextToken = ts.findPrecedingToken(contextToken.getFullStart(), sourceFile, /*startNode*/ undefined, insideJsDocTagTypeExpression); // TODO: GH#18217
-                log("getCompletionData: Get previous token 2: " + (ts.timestamp() - start_4));
+                log("getCompletionData: Get previous token 2: " + (ts.timestamp() - start_1));
             }
             // Find the node where completion is requested on.
             // Also determine whether we are trying to complete with members of that node
@@ -88472,7 +90123,7 @@ var ts;
             var isRightOfOpenTag = false;
             var isStartingCloseTag = false;
             var isJsxInitializer = false;
-            var location = ts.getTouchingPropertyName(sourceFile, position, insideJsDocTagTypeExpression); // TODO: GH#15853
+            var location = ts.getTouchingPropertyName(sourceFile, position);
             if (contextToken) {
                 // Bail out if this is a known invalid completion location
                 if (isCompletionListBlocker(contextToken)) {
@@ -88591,8 +90242,10 @@ var ts;
                 }
             }
             log("getCompletionData: Semantic work: " + (ts.timestamp() - semanticStart));
-            var recommendedCompletion = previousToken && getRecommendedCompletion(previousToken, position, sourceFile, typeChecker);
-            return { kind: 0 /* Data */, symbols: symbols, completionKind: completionKind, isInSnippetScope: isInSnippetScope, propertyAccessToConvert: propertyAccessToConvert, isNewIdentifierLocation: isNewIdentifierLocation, location: location, keywordFilters: keywordFilters, symbolToOriginInfoMap: symbolToOriginInfoMap, recommendedCompletion: recommendedCompletion, previousToken: previousToken, isJsxInitializer: isJsxInitializer };
+            var contextualType = previousToken && getContextualType(previousToken, position, sourceFile, typeChecker);
+            var literals = ts.mapDefined(contextualType && (contextualType.isUnion() ? contextualType.types : [contextualType]), function (t) { return t.isLiteral() ? t.value : undefined; });
+            var recommendedCompletion = previousToken && contextualType && getRecommendedCompletion(previousToken, contextualType, typeChecker);
+            return { kind: 0 /* Data */, symbols: symbols, completionKind: completionKind, isInSnippetScope: isInSnippetScope, propertyAccessToConvert: propertyAccessToConvert, isNewIdentifierLocation: isNewIdentifierLocation, location: location, keywordFilters: keywordFilters, literals: literals, symbolToOriginInfoMap: symbolToOriginInfoMap, recommendedCompletion: recommendedCompletion, previousToken: previousToken, isJsxInitializer: isJsxInitializer };
             function isTagWithTypeExpression(tag) {
                 switch (tag.kind) {
                     case 293 /* JSDocParameterTag */:
@@ -88627,9 +90280,9 @@ var ts;
                                 function (symbol) { return isValidTypeAccess_1(symbol) || isValidValueAccess_1(symbol); } :
                                 isTypeLocation ? isValidTypeAccess_1 : isValidValueAccess_1;
                             for (var _i = 0, exportedSymbols_1 = exportedSymbols; _i < exportedSymbols_1.length; _i++) {
-                                var symbol_2 = exportedSymbols_1[_i];
-                                if (isValidAccess(symbol_2)) {
-                                    symbols.push(symbol_2);
+                                var symbol_1 = exportedSymbols_1[_i];
+                                if (isValidAccess(symbol_1)) {
+                                    symbols.push(symbol_1);
                                 }
                             }
                             // If the module is merged with a value, we must get the type of the class and add its propertes (for inherited static methods).
@@ -88650,7 +90303,7 @@ var ts;
                 }
             }
             function addTypeProperties(type) {
-                isNewIdentifierLocation = hasIndexSignature(type);
+                isNewIdentifierLocation = !!type.getStringIndexType();
                 if (isUncheckedFile) {
                     // In javascript files, for union types, we don't just get the members that
                     // the individual types have in common, we also include all the members that
@@ -89716,7 +91369,7 @@ var ts;
     var DocumentHighlights;
     (function (DocumentHighlights) {
         function getDocumentHighlights(program, cancellationToken, sourceFile, position, sourceFilesToSearch) {
-            var node = ts.getTouchingPropertyName(sourceFile, position, /*includeJsDocComment*/ true);
+            var node = ts.getTouchingPropertyName(sourceFile, position);
             if (node.parent && (ts.isJsxOpeningElement(node.parent) && node.parent.tagName === node || ts.isJsxClosingElement(node.parent))) {
                 // For a JSX element, just highlight the matching tag, not all references.
                 var _a = node.parent.parent, openingElement = _a.openingElement, closingElement = _a.closingElement;
@@ -90580,8 +92233,8 @@ var ts;
         function findModuleReferences(program, sourceFiles, searchModuleSymbol) {
             var refs = [];
             var checker = program.getTypeChecker();
-            for (var _i = 0, sourceFiles_5 = sourceFiles; _i < sourceFiles_5.length; _i++) {
-                var referencingFile = sourceFiles_5[_i];
+            for (var _i = 0, sourceFiles_1 = sourceFiles; _i < sourceFiles_1.length; _i++) {
+                var referencingFile = sourceFiles_1[_i];
                 var searchSourceFile = searchModuleSymbol.valueDeclaration;
                 if (searchSourceFile.kind === 274 /* SourceFile */) {
                     for (var _a = 0, _b = referencingFile.referencedFiles; _a < _b.length; _a++) {
@@ -90611,8 +92264,8 @@ var ts;
         /** Returns a map from a module symbol Id to all import statements that directly reference the module. */
         function getDirectImportsMap(sourceFiles, checker, cancellationToken) {
             var map = ts.createMap();
-            for (var _i = 0, sourceFiles_6 = sourceFiles; _i < sourceFiles_6.length; _i++) {
-                var sourceFile = sourceFiles_6[_i];
+            for (var _i = 0, sourceFiles_2 = sourceFiles; _i < sourceFiles_2.length; _i++) {
+                var sourceFile = sourceFiles_2[_i];
                 cancellationToken.throwIfCancellationRequested();
                 forEachImport(sourceFile, function (importDecl, moduleSpecifier) {
                     var moduleSymbol = checker.getSymbolAtLocation(moduleSpecifier);
@@ -90880,7 +92533,7 @@ var ts;
         }
         FindAllReferences.nodeEntry = nodeEntry;
         function findReferencedSymbols(program, cancellationToken, sourceFiles, sourceFile, position) {
-            var node = ts.getTouchingPropertyName(sourceFile, position, /*includeJsDocComment*/ true);
+            var node = ts.getTouchingPropertyName(sourceFile, position);
             var referencedSymbols = FindAllReferences.Core.getReferencedSymbolsForNode(position, node, program, sourceFiles, cancellationToken);
             var checker = program.getTypeChecker();
             return !referencedSymbols || !referencedSymbols.length ? undefined : ts.mapDefined(referencedSymbols, function (_a) {
@@ -90894,8 +92547,7 @@ var ts;
         }
         FindAllReferences.findReferencedSymbols = findReferencedSymbols;
         function getImplementationsAtPosition(program, cancellationToken, sourceFiles, sourceFile, position) {
-            // A node in a JSDoc comment can't have an implementation anyway.
-            var node = ts.getTouchingPropertyName(sourceFile, position, /*includeJsDocComment*/ false);
+            var node = ts.getTouchingPropertyName(sourceFile, position);
             var referenceEntries = getImplementationReferenceEntries(program, cancellationToken, sourceFiles, node, position);
             var checker = program.getTypeChecker();
             return ts.map(referenceEntries, function (entry) { return toImplementationLocation(entry, checker); });
@@ -90909,9 +92561,9 @@ var ts;
             // If invoked directly on a shorthand property assignment, then return
             // the declaration of the symbol being assigned (not the symbol being assigned to).
             if (node.parent.kind === 271 /* ShorthandPropertyAssignment */) {
-                var result_5 = [];
-                FindAllReferences.Core.getReferenceEntriesForShorthandPropertyAssignment(node, checker, function (node) { return result_5.push(nodeEntry(node)); });
-                return result_5;
+                var result_1 = [];
+                FindAllReferences.Core.getReferenceEntriesForShorthandPropertyAssignment(node, checker, function (node) { return result_1.push(nodeEntry(node)); });
+                return result_1;
             }
             else if (node.kind === 97 /* SuperKeyword */ || ts.isSuperProperty(node.parent)) {
                 // References to and accesses on the super keyword only have one possible implementation, so no
@@ -90925,7 +92577,7 @@ var ts;
             }
         }
         function findReferencedEntries(program, cancellationToken, sourceFiles, sourceFile, position, options) {
-            var node = ts.getTouchingPropertyName(sourceFile, position, /*includeJsDocComment*/ true);
+            var node = ts.getTouchingPropertyName(sourceFile, position);
             return ts.map(flattenEntries(FindAllReferences.Core.getReferencedSymbolsForNode(position, node, program, sourceFiles, cancellationToken, options)), toReferenceEntry);
         }
         FindAllReferences.findReferencedEntries = findReferencedEntries;
@@ -90944,27 +92596,27 @@ var ts;
                     case "symbol": {
                         var symbol = def.symbol;
                         var _a = getDefinitionKindAndDisplayParts(symbol, checker, originalNode), displayParts_1 = _a.displayParts, kind_1 = _a.kind;
-                        var name_3 = displayParts_1.map(function (p) { return p.text; }).join("");
-                        return { node: symbol.declarations ? ts.getNameOfDeclaration(ts.first(symbol.declarations)) || ts.first(symbol.declarations) : originalNode, name: name_3, kind: kind_1, displayParts: displayParts_1 };
+                        var name_1 = displayParts_1.map(function (p) { return p.text; }).join("");
+                        return { node: symbol.declarations ? ts.getNameOfDeclaration(ts.first(symbol.declarations)) || ts.first(symbol.declarations) : originalNode, name: name_1, kind: kind_1, displayParts: displayParts_1 };
                     }
                     case "label": {
-                        var node_3 = def.node;
-                        return { node: node_3, name: node_3.text, kind: "label" /* label */, displayParts: [ts.displayPart(node_3.text, ts.SymbolDisplayPartKind.text)] };
+                        var node_1 = def.node;
+                        return { node: node_1, name: node_1.text, kind: "label" /* label */, displayParts: [ts.displayPart(node_1.text, ts.SymbolDisplayPartKind.text)] };
                     }
                     case "keyword": {
-                        var node_4 = def.node;
-                        var name_4 = ts.tokenToString(node_4.kind);
-                        return { node: node_4, name: name_4, kind: "keyword" /* keyword */, displayParts: [{ text: name_4, kind: "keyword" /* keyword */ }] };
+                        var node_2 = def.node;
+                        var name_2 = ts.tokenToString(node_2.kind);
+                        return { node: node_2, name: name_2, kind: "keyword" /* keyword */, displayParts: [{ text: name_2, kind: "keyword" /* keyword */ }] };
                     }
                     case "this": {
-                        var node_5 = def.node;
-                        var symbol = checker.getSymbolAtLocation(node_5);
-                        var displayParts_2 = symbol && ts.SymbolDisplay.getSymbolDisplayPartsDocumentationAndSymbolKind(checker, symbol, node_5.getSourceFile(), ts.getContainerNode(node_5), node_5).displayParts || [ts.textPart("this")];
-                        return { node: node_5, name: "this", kind: "var" /* variableElement */, displayParts: displayParts_2 };
+                        var node_3 = def.node;
+                        var symbol = checker.getSymbolAtLocation(node_3);
+                        var displayParts_2 = symbol && ts.SymbolDisplay.getSymbolDisplayPartsDocumentationAndSymbolKind(checker, symbol, node_3.getSourceFile(), ts.getContainerNode(node_3), node_3).displayParts || [ts.textPart("this")];
+                        return { node: node_3, name: "this", kind: "var" /* variableElement */, displayParts: displayParts_2 };
                     }
                     case "string": {
-                        var node_6 = def.node;
-                        return { node: node_6, name: node_6.text, kind: "var" /* variableElement */, displayParts: [ts.displayPart(ts.getTextOfNode(node_6), ts.SymbolDisplayPartKind.stringLiteral)] };
+                        var node_4 = def.node;
+                        return { node: node_4, name: node_4.text, kind: "var" /* variableElement */, displayParts: [ts.displayPart(ts.getTextOfNode(node_4), ts.SymbolDisplayPartKind.stringLiteral)] };
                     }
                     default:
                         return ts.Debug.assertNever(def);
@@ -91329,8 +92981,8 @@ var ts;
                     var sourceId = ts.getNodeId(sourceFile);
                     var seenSymbols = this.sourceFileToSeenSymbols[sourceId] || (this.sourceFileToSeenSymbols[sourceId] = ts.createMap());
                     var anyNewSymbols = false;
-                    for (var _i = 0, symbols_5 = symbols; _i < symbols_5.length; _i++) {
-                        var sym = symbols_5[_i];
+                    for (var _i = 0, symbols_2 = symbols; _i < symbols_2.length; _i++) {
+                        var sym = symbols_2[_i];
                         anyNewSymbols = ts.addToSeen(seenSymbols, ts.getSymbolId(sym)) || anyNewSymbols;
                     }
                     return anyNewSymbols;
@@ -91463,8 +93115,8 @@ var ts;
                     return undefined;
                 }
                 var scope;
-                for (var _i = 0, declarations_10 = declarations; _i < declarations_10.length; _i++) {
-                    var declaration = declarations_10[_i];
+                for (var _i = 0, declarations_1 = declarations; _i < declarations_1.length; _i++) {
+                    var declaration = declarations_1[_i];
                     var container = ts.getContainerNode(declaration);
                     if (scope && scope !== container) {
                         // Different declarations have different containers, bail out
@@ -91511,7 +93163,7 @@ var ts;
             Core.eachSymbolReferenceInFile = eachSymbolReferenceInFile;
             function getPossibleSymbolReferenceNodes(sourceFile, symbolName, container) {
                 if (container === void 0) { container = sourceFile; }
-                return getPossibleSymbolReferencePositions(sourceFile, symbolName, container).map(function (pos) { return ts.getTouchingPropertyName(sourceFile, pos, /*includeJsDocComment*/ true); });
+                return getPossibleSymbolReferencePositions(sourceFile, symbolName, container).map(function (pos) { return ts.getTouchingPropertyName(sourceFile, pos); });
             }
             function getPossibleSymbolReferencePositions(sourceFile, symbolName, container) {
                 if (container === void 0) { container = sourceFile; }
@@ -91601,7 +93253,7 @@ var ts;
                 return !!(ts.getMeaningFromLocation(referenceLocation) & state.searchMeaning);
             }
             function getReferencesAtLocation(sourceFile, position, search, state, addReferencesHere) {
-                var referenceLocation = ts.getTouchingPropertyName(sourceFile, position, /*includeJsDocComment*/ true);
+                var referenceLocation = ts.getTouchingPropertyName(sourceFile, position);
                 if (!isValidReferencePosition(referenceLocation, search.text)) {
                     // This wasn't the start of a token.  Check to see if it might be a
                     // match in a comment or string if that's what the caller is asking
@@ -92160,8 +93812,8 @@ var ts;
                         // To achieve that we will keep iterating until the result stabilizes.
                         // Remember the last meaning
                         lastIterationMeaning = meaning;
-                        for (var _i = 0, declarations_11 = declarations; _i < declarations_11.length; _i++) {
-                            var declaration = declarations_11[_i];
+                        for (var _i = 0, declarations_2 = declarations; _i < declarations_2.length; _i++) {
+                            var declaration = declarations_2[_i];
                             var declarationMeaning = ts.getMeaningFromDeclaration(declaration);
                             if (declarationMeaning & meaning) {
                                 meaning |= declarationMeaning;
@@ -92292,8 +93944,8 @@ var ts;
             // Type annotation needed due to #7294
             var elements = ts.isArrayLiteralExpression(property.initializer) ? property.initializer.elements : [property.initializer];
             var foundExactMatch = false;
-            for (var _i = 0, elements_5 = elements; _i < elements_5.length; _i++) {
-                var element = elements_5[_i];
+            for (var _i = 0, elements_1 = elements; _i < elements_1.length; _i++) {
+                var element = elements_1[_i];
                 foundExactMatch = tryUpdateString(element) || foundExactMatch;
             }
             return foundExactMatch;
@@ -92314,7 +93966,7 @@ var ts;
         }
     }
     function updateImports(program, changeTracker, oldToNew, newToOld, host, getCanonicalFileName, preferences) {
-        var _loop_14 = function (sourceFile) {
+        var _loop_3 = function (sourceFile) {
             var newImportFromPath = oldToNew(sourceFile.fileName) || sourceFile.fileName;
             var newImportFromDirectory = ts.getDirectoryPath(newImportFromPath);
             var oldFromNew = newToOld(sourceFile.fileName);
@@ -92332,12 +93984,12 @@ var ts;
                     // TODO:GH#18217
                     ? getSourceFileToImportFromResolved(ts.resolveModuleName(importLiteral.text, oldImportFromPath, program.getCompilerOptions(), host), oldToNew, program)
                     : getSourceFileToImport(importLiteral, sourceFile, program, host, oldToNew);
-                return toImport === undefined ? undefined : ts.moduleSpecifiers.getModuleSpecifier(program, sourceFile, newImportFromPath, toImport, host, preferences);
+                return toImport === undefined ? undefined : ts.moduleSpecifiers.getModuleSpecifier(program.getCompilerOptions(), sourceFile, newImportFromPath, toImport, host, preferences);
             });
         };
         for (var _i = 0, _a = program.getSourceFiles(); _i < _a.length; _i++) {
             var sourceFile = _a[_i];
-            _loop_14(sourceFile);
+            _loop_3(sourceFile);
         }
     }
     function combineNormal(pathA, pathB) {
@@ -92408,7 +94060,7 @@ var ts;
             if (reference) {
                 return [getDefinitionInfoForFileReference(reference.fileName, reference.file.fileName)];
             }
-            var node = ts.getTouchingPropertyName(sourceFile, position, /*includeJsDocComment*/ true);
+            var node = ts.getTouchingPropertyName(sourceFile, position);
             if (node === sourceFile) {
                 return undefined;
             }
@@ -92430,11 +94082,16 @@ var ts;
                 var sigInfo = createDefinitionFromSignatureDeclaration(typeChecker, calledDeclaration);
                 // For a function, if this is the original function definition, return just sigInfo.
                 // If this is the original constructor definition, parent is the class.
-                return typeChecker.getRootSymbols(symbol).some(function (s) { return calledDeclaration.symbol === s || calledDeclaration.symbol.parent === s; }) ||
+                if (typeChecker.getRootSymbols(symbol).some(function (s) { return calledDeclaration.symbol === s || calledDeclaration.symbol.parent === s; }) ||
                     // TODO: GH#23742 Following check shouldn't be necessary if 'require' is an alias
-                    symbol.declarations.some(function (d) { return ts.isVariableDeclaration(d) && !!d.initializer && ts.isRequireCall(d.initializer, /*checkArgumentIsStringLiteralLike*/ false); })
-                    ? [sigInfo]
-                    : [sigInfo].concat(getDefinitionFromSymbol(typeChecker, symbol, node));
+                    symbol.declarations.some(function (d) { return ts.isVariableDeclaration(d) && !!d.initializer && ts.isRequireCall(d.initializer, /*checkArgumentIsStringLiteralLike*/ false); })) {
+                    return [sigInfo];
+                }
+                else {
+                    var defs = getDefinitionFromSymbol(typeChecker, symbol, node);
+                    // For a 'super()' call, put the signature first, else put the variable first.
+                    return node.kind === 97 /* SuperKeyword */ ? [sigInfo].concat(defs) : defs.concat([sigInfo]);
+                }
             }
             // Because name in short-hand property assignment has two different meanings: property name and property value,
             // using go-to-definition at such position should go to the variable declaration of the property value rather than
@@ -92487,21 +94144,26 @@ var ts;
         function getReferenceAtPosition(sourceFile, position, program) {
             var referencePath = findReferenceInPosition(sourceFile.referencedFiles, position);
             if (referencePath) {
-                var file_16 = ts.tryResolveScriptReference(program, sourceFile, referencePath);
-                return file_16 && { fileName: referencePath.fileName, file: file_16 };
+                var file = ts.tryResolveScriptReference(program, sourceFile, referencePath);
+                return file && { fileName: referencePath.fileName, file: file };
             }
             var typeReferenceDirective = findReferenceInPosition(sourceFile.typeReferenceDirectives, position);
             if (typeReferenceDirective) {
                 var reference = program.getResolvedTypeReferenceDirectives().get(typeReferenceDirective.fileName);
-                var file_17 = reference && program.getSourceFile(reference.resolvedFileName); // TODO:GH#18217
-                return file_17 && { fileName: typeReferenceDirective.fileName, file: file_17 };
+                var file = reference && program.getSourceFile(reference.resolvedFileName); // TODO:GH#18217
+                return file && { fileName: typeReferenceDirective.fileName, file: file };
+            }
+            var libReferenceDirective = findReferenceInPosition(sourceFile.libReferenceDirectives, position);
+            if (libReferenceDirective) {
+                var file = program.getLibFileFromReference(libReferenceDirective);
+                return file && { fileName: libReferenceDirective.fileName, file: file };
             }
             return undefined;
         }
         GoToDefinition.getReferenceAtPosition = getReferenceAtPosition;
         /// Goto type
         function getTypeDefinitionAtPosition(typeChecker, sourceFile, position) {
-            var node = ts.getTouchingPropertyName(sourceFile, position, /*includeJsDocComment*/ true);
+            var node = ts.getTouchingPropertyName(sourceFile, position);
             if (node === sourceFile) {
                 return undefined;
             }
@@ -92522,11 +94184,13 @@ var ts;
                 return undefined;
             }
             // Check if position is on triple slash reference.
-            var comment = findReferenceInPosition(sourceFile.referencedFiles, position) || findReferenceInPosition(sourceFile.typeReferenceDirectives, position);
+            var comment = findReferenceInPosition(sourceFile.referencedFiles, position) ||
+                findReferenceInPosition(sourceFile.typeReferenceDirectives, position) ||
+                findReferenceInPosition(sourceFile.libReferenceDirectives, position);
             if (comment) {
                 return { definitions: definitions, textSpan: ts.createTextSpanFromRange(comment) };
             }
-            var node = ts.getTouchingPropertyName(sourceFile, position, /*includeJsDocComment*/ true);
+            var node = ts.getTouchingPropertyName(sourceFile, position);
             var textSpan = ts.createTextSpan(node.getStart(), node.getWidth());
             return { definitions: definitions, textSpan: textSpan };
         }
@@ -93010,368 +94674,6 @@ var ts;
 })(ts || (ts = {}));
 /* @internal */
 var ts;
-(function (ts) {
-    function stringToInt(str) {
-        var n = parseInt(str, 10);
-        if (isNaN(n)) {
-            throw new Error("Error in parseInt(" + JSON.stringify(str) + ")");
-        }
-        return n;
-    }
-    var isPrereleaseRegex = /^(.*)-next.\d+/;
-    var prereleaseSemverRegex = /^(\d+)\.(\d+)\.0-next.(\d+)$/;
-    var semverRegex = /^(\d+)\.(\d+)\.(\d+)$/;
-    var Semver = /** @class */ (function () {
-        function Semver(major, minor, patch, 
-        /**
-         * If true, this is `major.minor.0-next.patch`.
-         * If false, this is `major.minor.patch`.
-         */
-        isPrerelease) {
-            this.major = major;
-            this.minor = minor;
-            this.patch = patch;
-            this.isPrerelease = isPrerelease;
-        }
-        Semver.parse = function (semver) {
-            var isPrerelease = isPrereleaseRegex.test(semver);
-            var result = Semver.tryParse(semver, isPrerelease);
-            if (!result) {
-                throw new Error("Unexpected semver: " + semver + " (isPrerelease: " + isPrerelease + ")");
-            }
-            return result;
-        };
-        Semver.fromRaw = function (_a) {
-            var major = _a.major, minor = _a.minor, patch = _a.patch, isPrerelease = _a.isPrerelease;
-            return new Semver(major, minor, patch, isPrerelease);
-        };
-        // This must parse the output of `versionString`.
-        Semver.tryParse = function (semver, isPrerelease) {
-            // Per the semver spec <http://semver.org/#spec-item-2>:
-            // "A normal version number MUST take the form X.Y.Z where X, Y, and Z are non-negative integers, and MUST NOT contain leading zeroes."
-            var rgx = isPrerelease ? prereleaseSemverRegex : semverRegex;
-            var match = rgx.exec(semver);
-            return match ? new Semver(stringToInt(match[1]), stringToInt(match[2]), stringToInt(match[3]), isPrerelease) : undefined;
-        };
-        Object.defineProperty(Semver.prototype, "versionString", {
-            get: function () {
-                return this.isPrerelease ? this.major + "." + this.minor + ".0-next." + this.patch : this.major + "." + this.minor + "." + this.patch;
-            },
-            enumerable: true,
-            configurable: true
-        });
-        Semver.prototype.equals = function (sem) {
-            return this.major === sem.major && this.minor === sem.minor && this.patch === sem.patch && this.isPrerelease === sem.isPrerelease;
-        };
-        Semver.prototype.greaterThan = function (sem) {
-            return this.major > sem.major || this.major === sem.major
-                && (this.minor > sem.minor || this.minor === sem.minor
-                    && (!this.isPrerelease && sem.isPrerelease || this.isPrerelease === sem.isPrerelease
-                        && this.patch > sem.patch));
-        };
-        return Semver;
-    }());
-    ts.Semver = Semver;
-})(ts || (ts = {}));
-/* @internal */
-var ts;
-(function (ts) {
-    var JsTyping;
-    (function (JsTyping) {
-        /* @internal */
-        function isTypingUpToDate(cachedTyping, availableTypingVersions) {
-            var availableVersion = ts.Semver.parse(ts.getProperty(availableTypingVersions, "ts" + ts.versionMajorMinor) || ts.getProperty(availableTypingVersions, "latest"));
-            return !availableVersion.greaterThan(cachedTyping.version);
-        }
-        JsTyping.isTypingUpToDate = isTypingUpToDate;
-        /* @internal */
-        JsTyping.nodeCoreModuleList = [
-            "assert",
-            "async_hooks",
-            "buffer",
-            "child_process",
-            "cluster",
-            "console",
-            "constants",
-            "crypto",
-            "dgram",
-            "dns",
-            "domain",
-            "events",
-            "fs",
-            "http",
-            "https",
-            "http2",
-            "inspector",
-            "net",
-            "os",
-            "path",
-            "perf_hooks",
-            "process",
-            "punycode",
-            "querystring",
-            "readline",
-            "repl",
-            "stream",
-            "string_decoder",
-            "timers",
-            "tls",
-            "tty",
-            "url",
-            "util",
-            "v8",
-            "vm",
-            "zlib"
-        ];
-        /* @internal */
-        JsTyping.nodeCoreModules = ts.arrayToSet(JsTyping.nodeCoreModuleList);
-        function loadSafeList(host, safeListPath) {
-            var result = ts.readConfigFile(safeListPath, function (path) { return host.readFile(path); });
-            return ts.createMapFromTemplate(result.config);
-        }
-        JsTyping.loadSafeList = loadSafeList;
-        function loadTypesMap(host, typesMapPath) {
-            var result = ts.readConfigFile(typesMapPath, function (path) { return host.readFile(path); });
-            if (result.config) {
-                return ts.createMapFromTemplate(result.config.simpleMap);
-            }
-            return undefined;
-        }
-        JsTyping.loadTypesMap = loadTypesMap;
-        /**
-         * @param host is the object providing I/O related operations.
-         * @param fileNames are the file names that belong to the same project
-         * @param projectRootPath is the path to the project root directory
-         * @param safeListPath is the path used to retrieve the safe list
-         * @param packageNameToTypingLocation is the map of package names to their cached typing locations and installed versions
-         * @param typeAcquisition is used to customize the typing acquisition process
-         * @param compilerOptions are used as a source for typing inference
-         */
-        function discoverTypings(host, log, fileNames, projectRootPath, safeList, packageNameToTypingLocation, typeAcquisition, unresolvedImports, typesRegistry) {
-            if (!typeAcquisition || !typeAcquisition.enable) {
-                return { cachedTypingPaths: [], newTypingNames: [], filesToWatch: [] };
-            }
-            // A typing name to typing file path mapping
-            var inferredTypings = ts.createMap();
-            // Only infer typings for .js and .jsx files
-            fileNames = ts.mapDefined(fileNames, function (fileName) {
-                var path = ts.normalizePath(fileName);
-                if (ts.hasJavaScriptFileExtension(path)) {
-                    return path;
-                }
-            });
-            var filesToWatch = [];
-            if (typeAcquisition.include)
-                addInferredTypings(typeAcquisition.include, "Explicitly included types");
-            var exclude = typeAcquisition.exclude || [];
-            // Directories to search for package.json, bower.json and other typing information
-            var possibleSearchDirs = ts.arrayToSet(fileNames, ts.getDirectoryPath);
-            possibleSearchDirs.set(projectRootPath, true);
-            possibleSearchDirs.forEach(function (_true, searchDir) {
-                var packageJsonPath = ts.combinePaths(searchDir, "package.json");
-                getTypingNamesFromJson(packageJsonPath, filesToWatch);
-                var bowerJsonPath = ts.combinePaths(searchDir, "bower.json");
-                getTypingNamesFromJson(bowerJsonPath, filesToWatch);
-                var bowerComponentsPath = ts.combinePaths(searchDir, "bower_components");
-                getTypingNamesFromPackagesFolder(bowerComponentsPath, filesToWatch);
-                var nodeModulesPath = ts.combinePaths(searchDir, "node_modules");
-                getTypingNamesFromPackagesFolder(nodeModulesPath, filesToWatch);
-            });
-            getTypingNamesFromSourceFileNames(fileNames);
-            // add typings for unresolved imports
-            if (unresolvedImports) {
-                var module_1 = ts.deduplicate(unresolvedImports.map(function (moduleId) { return JsTyping.nodeCoreModules.has(moduleId) ? "node" : moduleId; }), ts.equateStringsCaseSensitive, ts.compareStringsCaseSensitive);
-                addInferredTypings(module_1, "Inferred typings from unresolved imports");
-            }
-            // Add the cached typing locations for inferred typings that are already installed
-            packageNameToTypingLocation.forEach(function (typing, name) {
-                var registryEntry = typesRegistry.get(name);
-                if (inferredTypings.has(name) && inferredTypings.get(name) === undefined && registryEntry !== undefined && isTypingUpToDate(typing, registryEntry)) {
-                    inferredTypings.set(name, typing.typingLocation);
-                }
-            });
-            // Remove typings that the user has added to the exclude list
-            for (var _i = 0, exclude_1 = exclude; _i < exclude_1.length; _i++) {
-                var excludeTypingName = exclude_1[_i];
-                var didDelete = inferredTypings.delete(excludeTypingName);
-                if (didDelete && log)
-                    log("Typing for " + excludeTypingName + " is in exclude list, will be ignored.");
-            }
-            var newTypingNames = [];
-            var cachedTypingPaths = [];
-            inferredTypings.forEach(function (inferred, typing) {
-                if (inferred !== undefined) {
-                    cachedTypingPaths.push(inferred);
-                }
-                else {
-                    newTypingNames.push(typing);
-                }
-            });
-            var result = { cachedTypingPaths: cachedTypingPaths, newTypingNames: newTypingNames, filesToWatch: filesToWatch };
-            if (log)
-                log("Result: " + JSON.stringify(result));
-            return result;
-            function addInferredTyping(typingName) {
-                if (!inferredTypings.has(typingName)) {
-                    inferredTypings.set(typingName, undefined); // TODO: GH#18217
-                }
-            }
-            function addInferredTypings(typingNames, message) {
-                if (log)
-                    log(message + ": " + JSON.stringify(typingNames));
-                ts.forEach(typingNames, addInferredTyping);
-            }
-            /**
-             * Get the typing info from common package manager json files like package.json or bower.json
-             */
-            function getTypingNamesFromJson(jsonPath, filesToWatch) {
-                if (!host.fileExists(jsonPath)) {
-                    return;
-                }
-                filesToWatch.push(jsonPath);
-                var jsonConfig = ts.readConfigFile(jsonPath, function (path) { return host.readFile(path); }).config;
-                var jsonTypingNames = ts.flatMap([jsonConfig.dependencies, jsonConfig.devDependencies, jsonConfig.optionalDependencies, jsonConfig.peerDependencies], ts.getOwnKeys);
-                addInferredTypings(jsonTypingNames, "Typing names in '" + jsonPath + "' dependencies");
-            }
-            /**
-             * Infer typing names from given file names. For example, the file name "jquery-min.2.3.4.js"
-             * should be inferred to the 'jquery' typing name; and "angular-route.1.2.3.js" should be inferred
-             * to the 'angular-route' typing name.
-             * @param fileNames are the names for source files in the project
-             */
-            function getTypingNamesFromSourceFileNames(fileNames) {
-                var fromFileNames = ts.mapDefined(fileNames, function (j) {
-                    if (!ts.hasJavaScriptFileExtension(j))
-                        return undefined;
-                    var inferredTypingName = ts.removeFileExtension(ts.getBaseFileName(j.toLowerCase()));
-                    var cleanedTypingName = ts.removeMinAndVersionNumbers(inferredTypingName);
-                    return safeList.get(cleanedTypingName);
-                });
-                if (fromFileNames.length) {
-                    addInferredTypings(fromFileNames, "Inferred typings from file names");
-                }
-                var hasJsxFile = ts.some(fileNames, function (f) { return ts.fileExtensionIs(f, ".jsx" /* Jsx */); });
-                if (hasJsxFile) {
-                    if (log)
-                        log("Inferred 'react' typings due to presence of '.jsx' extension");
-                    addInferredTyping("react");
-                }
-            }
-            /**
-             * Infer typing names from packages folder (ex: node_module, bower_components)
-             * @param packagesFolderPath is the path to the packages folder
-             */
-            function getTypingNamesFromPackagesFolder(packagesFolderPath, filesToWatch) {
-                filesToWatch.push(packagesFolderPath);
-                // Todo: add support for ModuleResolutionHost too
-                if (!host.directoryExists(packagesFolderPath)) {
-                    return;
-                }
-                // depth of 2, so we access `node_modules/foo` but not `node_modules/foo/bar`
-                var fileNames = host.readDirectory(packagesFolderPath, [".json" /* Json */], /*excludes*/ undefined, /*includes*/ undefined, /*depth*/ 2);
-                if (log)
-                    log("Searching for typing names in " + packagesFolderPath + "; all files: " + JSON.stringify(fileNames));
-                var packageNames = [];
-                for (var _i = 0, fileNames_1 = fileNames; _i < fileNames_1.length; _i++) {
-                    var fileName = fileNames_1[_i];
-                    var normalizedFileName = ts.normalizePath(fileName);
-                    var baseFileName = ts.getBaseFileName(normalizedFileName);
-                    if (baseFileName !== "package.json" && baseFileName !== "bower.json") {
-                        continue;
-                    }
-                    var result_6 = ts.readConfigFile(normalizedFileName, function (path) { return host.readFile(path); });
-                    var packageJson = result_6.config;
-                    // npm 3's package.json contains a "_requiredBy" field
-                    // we should include all the top level module names for npm 2, and only module names whose
-                    // "_requiredBy" field starts with "#" or equals "/" for npm 3.
-                    if (baseFileName === "package.json" && packageJson._requiredBy &&
-                        ts.filter(packageJson._requiredBy, function (r) { return r[0] === "#" || r === "/"; }).length === 0) {
-                        continue;
-                    }
-                    // If the package has its own d.ts typings, those will take precedence. Otherwise the package name will be used
-                    // to download d.ts files from DefinitelyTyped
-                    if (!packageJson.name) {
-                        continue;
-                    }
-                    var ownTypes = packageJson.types || packageJson.typings;
-                    if (ownTypes) {
-                        var absolutePath = ts.getNormalizedAbsolutePath(ownTypes, ts.getDirectoryPath(normalizedFileName));
-                        if (log)
-                            log("    Package '" + packageJson.name + "' provides its own types.");
-                        inferredTypings.set(packageJson.name, absolutePath);
-                    }
-                    else {
-                        packageNames.push(packageJson.name);
-                    }
-                }
-                addInferredTypings(packageNames, "    Found package names");
-            }
-        }
-        JsTyping.discoverTypings = discoverTypings;
-        var PackageNameValidationResult;
-        (function (PackageNameValidationResult) {
-            PackageNameValidationResult[PackageNameValidationResult["Ok"] = 0] = "Ok";
-            PackageNameValidationResult[PackageNameValidationResult["ScopedPackagesNotSupported"] = 1] = "ScopedPackagesNotSupported";
-            PackageNameValidationResult[PackageNameValidationResult["EmptyName"] = 2] = "EmptyName";
-            PackageNameValidationResult[PackageNameValidationResult["NameTooLong"] = 3] = "NameTooLong";
-            PackageNameValidationResult[PackageNameValidationResult["NameStartsWithDot"] = 4] = "NameStartsWithDot";
-            PackageNameValidationResult[PackageNameValidationResult["NameStartsWithUnderscore"] = 5] = "NameStartsWithUnderscore";
-            PackageNameValidationResult[PackageNameValidationResult["NameContainsNonURISafeCharacters"] = 6] = "NameContainsNonURISafeCharacters";
-        })(PackageNameValidationResult = JsTyping.PackageNameValidationResult || (JsTyping.PackageNameValidationResult = {}));
-        var maxPackageNameLength = 214;
-        /**
-         * Validates package name using rules defined at https://docs.npmjs.com/files/package.json
-         */
-        function validatePackageName(packageName) {
-            if (!packageName) {
-                return 2 /* EmptyName */;
-            }
-            if (packageName.length > maxPackageNameLength) {
-                return 3 /* NameTooLong */;
-            }
-            if (packageName.charCodeAt(0) === 46 /* dot */) {
-                return 4 /* NameStartsWithDot */;
-            }
-            if (packageName.charCodeAt(0) === 95 /* _ */) {
-                return 5 /* NameStartsWithUnderscore */;
-            }
-            // check if name is scope package like: starts with @ and has one '/' in the middle
-            // scoped packages are not currently supported
-            // TODO: when support will be added we'll need to split and check both scope and package name
-            if (/^@[^/]+\/[^/]+$/.test(packageName)) {
-                return 1 /* ScopedPackagesNotSupported */;
-            }
-            if (encodeURIComponent(packageName) !== packageName) {
-                return 6 /* NameContainsNonURISafeCharacters */;
-            }
-            return 0 /* Ok */;
-        }
-        JsTyping.validatePackageName = validatePackageName;
-        function renderPackageNameValidationFailure(result, typing) {
-            switch (result) {
-                case 2 /* EmptyName */:
-                    return "Package name '" + typing + "' cannot be empty";
-                case 3 /* NameTooLong */:
-                    return "Package name '" + typing + "' should be less than " + maxPackageNameLength + " characters";
-                case 4 /* NameStartsWithDot */:
-                    return "Package name '" + typing + "' cannot start with '.'";
-                case 5 /* NameStartsWithUnderscore */:
-                    return "Package name '" + typing + "' cannot start with '_'";
-                case 1 /* ScopedPackagesNotSupported */:
-                    return "Package '" + typing + "' is scoped and currently is not supported";
-                case 6 /* NameContainsNonURISafeCharacters */:
-                    return "Package name '" + typing + "' contains non URI safe characters";
-                case 0 /* Ok */:
-                    return ts.Debug.fail(); // Shouldn't have called this.
-                default:
-                    throw ts.Debug.assertNever(result);
-            }
-        }
-        JsTyping.renderPackageNameValidationFailure = renderPackageNameValidationFailure;
-    })(JsTyping = ts.JsTyping || (ts.JsTyping = {}));
-})(ts || (ts = {}));
-/* @internal */
-var ts;
 (function (ts) {
     var NavigateTo;
     (function (NavigateTo) {
@@ -93380,7 +94682,7 @@ var ts;
             if (!patternMatcher)
                 return ts.emptyArray;
             var rawItems = [];
-            var _loop_15 = function (sourceFile) {
+            var _loop_4 = function (sourceFile) {
                 cancellationToken.throwIfCancellationRequested();
                 if (excludeDtsFiles && ts.fileExtensionIs(sourceFile.fileName, ".d.ts" /* Dts */)) {
                     return "continue";
@@ -93390,9 +94692,9 @@ var ts;
                 });
             };
             // Search the declarations in all files and output matched NavigateToItem into array of NavigateToItem[]
-            for (var _i = 0, sourceFiles_7 = sourceFiles; _i < sourceFiles_7.length; _i++) {
-                var sourceFile = sourceFiles_7[_i];
-                _loop_15(sourceFile);
+            for (var _i = 0, sourceFiles_3 = sourceFiles; _i < sourceFiles_3.length; _i++) {
+                var sourceFile = sourceFiles_3[_i];
+                _loop_4(sourceFile);
             }
             rawItems.sort(compareNavigateToItems);
             if (maxResultCount !== undefined) {
@@ -93408,8 +94710,8 @@ var ts;
             if (!match) {
                 return; // continue to next named declarations
             }
-            for (var _i = 0, declarations_12 = declarations; _i < declarations_12.length; _i++) {
-                var declaration = declarations_12[_i];
+            for (var _i = 0, declarations_3 = declarations; _i < declarations_3.length; _i++) {
+                var declaration = declarations_3[_i];
                 if (!shouldKeepItem(declaration, checker))
                     continue;
                 if (patternMatcher.patternContainsDots) {
@@ -93587,7 +94889,7 @@ var ts;
         }
         function rootNavigationBarNode(sourceFile) {
             ts.Debug.assert(!parentsStack.length);
-            var root = { node: sourceFile, additionalNodes: undefined, parent: undefined, children: undefined, indent: 0 };
+            var root = { node: sourceFile, name: undefined, additionalNodes: undefined, parent: undefined, children: undefined, indent: 0 };
             parent = root;
             for (var _i = 0, _a = sourceFile.statements; _i < _a.length; _i++) {
                 var statement = _a[_i];
@@ -93603,6 +94905,7 @@ var ts;
         function emptyNavigationBarNode(node) {
             return {
                 node: node,
+                name: ts.isDeclaration(node) || ts.isExpression(node) ? ts.getNameOfDeclaration(node) : undefined,
                 additionalNodes: undefined,
                 parent: parent,
                 children: undefined,
@@ -93887,11 +95190,10 @@ var ts;
                     return undefined;
             }
         }
-        function getItemName(node) {
+        function getItemName(node, name) {
             if (node.kind === 239 /* ModuleDeclaration */) {
                 return getModuleName(node);
             }
-            var name = ts.getNameOfDeclaration(node);
             if (name) {
                 var text = nodeText(name);
                 if (text.length > 0) {
@@ -93993,16 +95295,17 @@ var ts;
         }
         function convertToTree(n) {
             return {
-                text: getItemName(n.node),
+                text: getItemName(n.node, n.name),
                 kind: ts.getNodeKind(n.node),
                 kindModifiers: getModifiers(n.node),
                 spans: getSpans(n),
+                nameSpan: n.name && getNodeSpan(n.name),
                 childItems: ts.map(n.children, convertToTree)
             };
         }
         function convertToTopLevelItem(n) {
             return {
-                text: getItemName(n.node),
+                text: getItemName(n.node, n.name),
                 kind: ts.getNodeKind(n.node),
                 kindModifiers: getModifiers(n.node),
                 spans: getSpans(n),
@@ -94013,7 +95316,7 @@ var ts;
             };
             function convertToChildItem(n) {
                 return {
-                    text: getItemName(n.node),
+                    text: getItemName(n.node, n.name),
                     kind: ts.getNodeKind(n.node),
                     kindModifiers: ts.getNodeModifiers(n.node),
                     spans: getSpans(n),
@@ -94488,8 +95791,8 @@ var ts;
             var firstSingleLineCommentStart = -1;
             var lastSingleLineCommentEnd = -1;
             var singleLineCommentCount = 0;
-            for (var _i = 0, comments_3 = comments; _i < comments_3.length; _i++) {
-                var _a = comments_3[_i], kind = _a.kind, pos = _a.pos, end = _a.end;
+            for (var _i = 0, comments_1 = comments; _i < comments_1.length; _i++) {
+                var _a = comments_1[_i], kind = _a.kind, pos = _a.pos, end = _a.end;
                 cancellationToken.throwIfCancellationRequested();
                 switch (kind) {
                     case 2 /* SingleLineCommentTrivia */:
@@ -94875,15 +96178,15 @@ var ts;
     // Assumes 'value' is already lowercase.
     function indexOfIgnoringCase(str, value) {
         var n = str.length - value.length;
-        var _loop_16 = function (start) {
+        var _loop_5 = function (start) {
             if (every(value, function (valueChar, i) { return toLowerCase(str.charCodeAt(i + start)) === valueChar; })) {
                 return { value: start };
             }
         };
         for (var start = 0; start <= n; start++) {
-            var state_4 = _loop_16(start);
-            if (typeof state_4 === "object")
-                return state_4.value;
+            var state_1 = _loop_5(start);
+            if (typeof state_1 === "object")
+                return state_1.value;
         }
         return -1;
     }
@@ -95067,6 +96370,7 @@ var ts;
             checkJsDirective: undefined,
             referencedFiles: [],
             typeReferenceDirectives: [],
+            libReferenceDirectives: [],
             amdDependencies: [],
             hasNoDefaultLib: undefined,
             moduleName: undefined
@@ -95367,7 +96671,7 @@ var ts;
                     importedFiles.push(decl.ref);
                 }
             }
-            return { referencedFiles: pragmaContext.referencedFiles, typeReferenceDirectives: pragmaContext.typeReferenceDirectives, importedFiles: importedFiles, isLibFile: !!pragmaContext.hasNoDefaultLib, ambientExternalModules: undefined };
+            return { referencedFiles: pragmaContext.referencedFiles, typeReferenceDirectives: pragmaContext.typeReferenceDirectives, libReferenceDirectives: pragmaContext.libReferenceDirectives, importedFiles: importedFiles, isLibFile: !!pragmaContext.hasNoDefaultLib, ambientExternalModules: undefined };
         }
         else {
             // for global scripts ambient modules still can have augmentations - look for ambient modules with depth > 0
@@ -95386,7 +96690,7 @@ var ts;
                     }
                 }
             }
-            return { referencedFiles: pragmaContext.referencedFiles, typeReferenceDirectives: pragmaContext.typeReferenceDirectives, importedFiles: importedFiles, isLibFile: !!pragmaContext.hasNoDefaultLib, ambientExternalModules: ambientModuleNames };
+            return { referencedFiles: pragmaContext.referencedFiles, typeReferenceDirectives: pragmaContext.typeReferenceDirectives, libReferenceDirectives: pragmaContext.libReferenceDirectives, importedFiles: importedFiles, isLibFile: !!pragmaContext.hasNoDefaultLib, ambientExternalModules: ambientModuleNames };
         }
     }
     ts.preProcessFile = preProcessFile;
@@ -95398,7 +96702,7 @@ var ts;
     (function (Rename) {
         function getRenameInfo(typeChecker, defaultLibFileName, getCanonicalFileName, sourceFile, position) {
             var getCanonicalDefaultLibName = ts.memoize(function () { return getCanonicalFileName(ts.normalizePath(defaultLibFileName)); });
-            var node = ts.getTouchingPropertyName(sourceFile, position, /*includeJsDocComment*/ true);
+            var node = ts.getTouchingPropertyName(sourceFile, position);
             var renameInfo = node && nodeIsEligibleForRename(node)
                 ? getRenameInfoForNode(node, typeChecker, sourceFile, isDefinedInLibraryFile)
                 : undefined;
@@ -95552,11 +96856,11 @@ var ts;
                 return undefined;
             }
             var typeChecker = program.getTypeChecker();
-            var _loop_17 = function (sourceFile) {
+            var _loop_6 = function (sourceFile) {
                 var nameToDeclarations = sourceFile.getNamedDeclarations();
                 var declarations = nameToDeclarations.get(name.text);
                 if (declarations) {
-                    var _loop_18 = function (declaration) {
+                    var _loop_7 = function (declaration) {
                         var symbol = declaration.symbol;
                         if (symbol) {
                             var type = typeChecker.getTypeOfSymbolAtLocation(symbol, declaration);
@@ -95568,19 +96872,19 @@ var ts;
                             }
                         }
                     };
-                    for (var _i = 0, declarations_13 = declarations; _i < declarations_13.length; _i++) {
-                        var declaration = declarations_13[_i];
-                        var state_6 = _loop_18(declaration);
-                        if (typeof state_6 === "object")
-                            return state_6;
+                    for (var _i = 0, declarations_4 = declarations; _i < declarations_4.length; _i++) {
+                        var declaration = declarations_4[_i];
+                        var state_3 = _loop_7(declaration);
+                        if (typeof state_3 === "object")
+                            return state_3;
                     }
                 }
             };
             for (var _i = 0, _a = program.getSourceFiles(); _i < _a.length; _i++) {
                 var sourceFile = _a[_i];
-                var state_5 = _loop_17(sourceFile);
-                if (typeof state_5 === "object")
-                    return state_5.value;
+                var state_2 = _loop_6(sourceFile);
+                if (typeof state_2 === "object")
+                    return state_2.value;
             }
         }
         function getArgumentInfoForCompletions(node, position, sourceFile) {
@@ -95808,7 +97112,7 @@ var ts;
             return ts.createTextSpan(applicableSpanStart, applicableSpanEnd - applicableSpanStart);
         }
         function getContainingArgumentInfo(node, position, sourceFile) {
-            var _loop_19 = function (n) {
+            var _loop_8 = function (n) {
                 // If the node is not a subspan of its parent, this is a big problem.
                 // There have been crashes that might be caused by this violation.
                 ts.Debug.assert(ts.rangeContainsRange(n.parent, n), "Not a subspan", function () { return "Child: " + ts.Debug.showSyntaxKind(n) + ", parent: " + ts.Debug.showSyntaxKind(n.parent); });
@@ -95818,9 +97122,9 @@ var ts;
                 }
             };
             for (var n = node; !ts.isBlock(n) && !ts.isSourceFile(n); n = n.parent) {
-                var state_7 = _loop_19(n);
-                if (typeof state_7 === "object")
-                    return state_7.value;
+                var state_4 = _loop_8(n);
+                if (typeof state_4 === "object")
+                    return state_4.value;
             }
             return undefined;
         }
@@ -95950,8 +97254,8 @@ var ts;
                 var name = importNameForConvertToDefaultImport(importNode);
                 if (!name)
                     continue;
-                var module_2 = ts.getResolvedModule(sourceFile, moduleSpecifier.text);
-                var resolvedFile = module_2 && program.getSourceFile(module_2.resolvedFileName);
+                var module = ts.getResolvedModule(sourceFile, moduleSpecifier.text);
+                var resolvedFile = module && program.getSourceFile(module.resolvedFileName);
                 if (resolvedFile && resolvedFile.externalModuleIndicator && ts.isExportAssignment(resolvedFile.externalModuleIndicator) && resolvedFile.externalModuleIndicator.isExportEquals) {
                     diags.push(ts.createDiagnosticForNode(name, ts.Diagnostics.Import_may_be_converted_to_a_default_import));
                 }
@@ -95966,8 +97270,8 @@ var ts;
                     case 192 /* FunctionExpression */:
                         var decl = ts.getDeclarationOfJSInitializer(node);
                         if (decl) {
-                            var symbol_3 = decl.symbol;
-                            if (symbol_3 && (symbol_3.exports && symbol_3.exports.size || symbol_3.members && symbol_3.members.size)) {
+                            var symbol_2 = decl.symbol;
+                            if (symbol_2 && (symbol_2.exports && symbol_2.exports.size || symbol_2.members && symbol_2.members.size)) {
                                 diags.push(ts.createDiagnosticForNode(ts.isVariableDeclaration(node.parent) ? node.parent.name : node, ts.Diagnostics.This_constructor_function_may_be_converted_to_a_class_declaration));
                                 break;
                             }
@@ -96755,7 +98059,7 @@ var ts;
             return typeof o.type === "object" && !ts.forEachEntry(o.type, function (v) { return typeof v !== "number"; });
         });
         options = ts.cloneCompilerOptions(options);
-        var _loop_20 = function (opt) {
+        var _loop_9 = function (opt) {
             if (!ts.hasProperty(options, opt.name)) {
                 return "continue";
             }
@@ -96774,7 +98078,7 @@ var ts;
         };
         for (var _i = 0, commandLineOptionsStringToEnum_1 = commandLineOptionsStringToEnum; _i < commandLineOptionsStringToEnum_1.length; _i++) {
             var opt = commandLineOptionsStringToEnum_1[_i];
-            _loop_20(opt);
+            _loop_9(opt);
         }
         return options;
     }
@@ -97764,18 +99068,18 @@ var ts;
             // This array is used only during construction of the rulesbucket in the map
             var rulesBucketConstructionStateList = new Array(map.length);
             for (var _i = 0, rules_1 = rules; _i < rules_1.length; _i++) {
-                var rule_1 = rules_1[_i];
-                var specificRule = rule_1.leftTokenRange.isSpecific && rule_1.rightTokenRange.isSpecific;
-                for (var _a = 0, _b = rule_1.leftTokenRange.tokens; _a < _b.length; _a++) {
+                var rule = rules_1[_i];
+                var specificRule = rule.leftTokenRange.isSpecific && rule.rightTokenRange.isSpecific;
+                for (var _a = 0, _b = rule.leftTokenRange.tokens; _a < _b.length; _a++) {
                     var left = _b[_a];
-                    for (var _c = 0, _d = rule_1.rightTokenRange.tokens; _c < _d.length; _c++) {
+                    for (var _c = 0, _d = rule.rightTokenRange.tokens; _c < _d.length; _c++) {
                         var right = _d[_c];
                         var index = getRuleBucketIndex(left, right);
                         var rulesBucket = map[index];
                         if (rulesBucket === undefined) {
                             rulesBucket = map[index] = [];
                         }
-                        addRule(rulesBucket, rule_1.rule, specificRule, rulesBucketConstructionStateList, index);
+                        addRule(rulesBucket, rule.rule, specificRule, rulesBucketConstructionStateList, index);
                     }
                 }
             }
@@ -98385,8 +99689,8 @@ var ts;
                             else if (tokenInfo.token.kind === listStartToken) {
                                 // consume list start token
                                 startLine = sourceFile.getLineAndCharacterOfPosition(tokenInfo.token.pos).line;
-                                var indentation_2 = computeIndentation(tokenInfo.token, startLine, -1 /* Unknown */, parent, parentDynamicIndentation, parentStartLine);
-                                listDynamicIndentation = getDynamicIndentation(parent, parentStartLine, indentation_2.indentation, indentation_2.delta);
+                                var indentation_1 = computeIndentation(tokenInfo.token, startLine, -1 /* Unknown */, parent, parentDynamicIndentation, parentStartLine);
+                                listDynamicIndentation = getDynamicIndentation(parent, parentStartLine, indentation_1.indentation, indentation_1.delta);
                                 consumeTokenAndAdvanceScanner(tokenInfo, parent, listDynamicIndentation, parent);
                             }
                             else {
@@ -99985,14 +101289,14 @@ var ts;
                     // order changes by start position
                     // If the start position is the same, put the shorter range first, since an empty range (x, x) may precede (x, y) but not vice-versa.
                     var normalized = ts.stableSort(changesInFile, function (a, b) { return (a.range.pos - b.range.pos) || (a.range.end - b.range.end); });
-                    var _loop_21 = function (i) {
+                    var _loop_10 = function (i) {
                         ts.Debug.assert(normalized[i].range.end <= normalized[i + 1].range.pos, "Changes overlap", function () {
                             return JSON.stringify(normalized[i].range) + " and " + JSON.stringify(normalized[i + 1].range);
                         });
                     };
                     // verify that change intervals do not overlap, except possibly at end points.
                     for (var i = 0; i < normalized.length - 1; i++) {
-                        _loop_21(i);
+                        _loop_10(i);
                     }
                     var textChanges = normalized.map(function (c) {
                         return ts.createTextChange(ts.createTextSpanFromRange(c.range), computeNewText(c, sourceFile, newLineCharacter, formatContext, validate));
@@ -100004,7 +101308,7 @@ var ts;
             function newFileChanges(oldFile, fileName, statements, newLineCharacter, formatContext) {
                 // TODO: this emits the file, parses it back, then formats it that -- may be a less roundabout way to do this
                 var nonFormattedText = statements.map(function (s) { return getNonformattedText(s, oldFile, newLineCharacter).text; }).join(newLineCharacter);
-                var sourceFile = ts.createSourceFile(fileName, nonFormattedText, 6 /* ESNext */);
+                var sourceFile = ts.createSourceFile(fileName, nonFormattedText, 6 /* ESNext */, /*setParentNodes*/ true);
                 var changes = ts.formatting.formatDocument(sourceFile, formatContext);
                 var text = applyChanges(nonFormattedText, changes);
                 return { fileName: fileName, textChanges: [ts.createTextChange(ts.createTextSpan(0, 0), text)], isNewFile: true };
@@ -100761,11 +102065,11 @@ var ts;
             getCodeActions: function (context) {
                 var sourceFile = context.sourceFile, program = context.program, preferences = context.preferences;
                 var changes = ts.textChanges.ChangeTracker.with(context, function (changes) {
-                    var moduleExportsChangedToDefault = convertFileToEs6Module(sourceFile, program.getTypeChecker(), changes, program.getCompilerOptions().target, preferences);
+                    var moduleExportsChangedToDefault = convertFileToEs6Module(sourceFile, program.getTypeChecker(), changes, program.getCompilerOptions().target, ts.getQuotePreference(sourceFile, preferences));
                     if (moduleExportsChangedToDefault) {
                         for (var _i = 0, _a = program.getSourceFiles(); _i < _a.length; _i++) {
                             var importingFile = _a[_i];
-                            fixImportOfModuleExports(importingFile, sourceFile, changes, preferences);
+                            fixImportOfModuleExports(importingFile, sourceFile, changes, ts.getQuotePreference(importingFile, preferences));
                         }
                     }
                 });
@@ -100773,7 +102077,7 @@ var ts;
                 return [codefix.createCodeFixActionNoFixId("convertToEs6Module", changes, ts.Diagnostics.Convert_to_ES6_module)];
             },
         });
-        function fixImportOfModuleExports(importingFile, exportingFile, changes, preferences) {
+        function fixImportOfModuleExports(importingFile, exportingFile, changes, quotePreference) {
             for (var _i = 0, _a = importingFile.imports; _i < _a.length; _i++) {
                 var moduleSpecifier = _a[_i];
                 var imported = ts.getResolvedModule(importingFile, moduleSpecifier.text);
@@ -100783,7 +102087,7 @@ var ts;
                 var importNode = ts.importFromModuleSpecifier(moduleSpecifier);
                 switch (importNode.kind) {
                     case 243 /* ImportEqualsDeclaration */:
-                        changes.replaceNode(importingFile, importNode, ts.makeImport(importNode.name, /*namedImports*/ undefined, moduleSpecifier, preferences));
+                        changes.replaceNode(importingFile, importNode, ts.makeImport(importNode.name, /*namedImports*/ undefined, moduleSpecifier, quotePreference));
                         break;
                     case 187 /* CallExpression */:
                         if (ts.isRequireCall(importNode, /*checkArgumentIsStringLiteralLike*/ false)) {
@@ -100794,14 +102098,14 @@ var ts;
             }
         }
         /** @returns Whether we converted a `module.exports =` to a default export. */
-        function convertFileToEs6Module(sourceFile, checker, changes, target, preferences) {
+        function convertFileToEs6Module(sourceFile, checker, changes, target, quotePreference) {
             var identifiers = { original: collectFreeIdentifiers(sourceFile), additional: ts.createMap() };
             var exports = collectExportRenames(sourceFile, checker, identifiers);
             convertExportsAccesses(sourceFile, exports, changes);
             var moduleExportsChangedToDefault = false;
             for (var _i = 0, _a = sourceFile.statements; _i < _a.length; _i++) {
                 var statement = _a[_i];
-                var moduleExportsChanged = convertStatement(sourceFile, statement, checker, changes, identifiers, target, exports, preferences);
+                var moduleExportsChanged = convertStatement(sourceFile, statement, checker, changes, identifiers, target, exports, quotePreference);
                 moduleExportsChangedToDefault = moduleExportsChangedToDefault || moduleExportsChanged;
             }
             return moduleExportsChangedToDefault;
@@ -100836,10 +102140,10 @@ var ts;
                 node.forEachChild(recur);
             });
         }
-        function convertStatement(sourceFile, statement, checker, changes, identifiers, target, exports, preferences) {
+        function convertStatement(sourceFile, statement, checker, changes, identifiers, target, exports, quotePreference) {
             switch (statement.kind) {
                 case 214 /* VariableStatement */:
-                    convertVariableStatement(sourceFile, statement, changes, checker, identifiers, target, preferences);
+                    convertVariableStatement(sourceFile, statement, changes, checker, identifiers, target, quotePreference);
                     return false;
                 case 216 /* ExpressionStatement */: {
                     var expression = statement.expression;
@@ -100847,7 +102151,7 @@ var ts;
                         case 187 /* CallExpression */: {
                             if (ts.isRequireCall(expression, /*checkArgumentIsStringLiteralLike*/ true)) {
                                 // For side-effecting require() call, just make a side-effecting import.
-                                changes.replaceNode(sourceFile, statement, ts.makeImport(/*name*/ undefined, /*namedImports*/ undefined, expression.arguments[0], preferences));
+                                changes.replaceNode(sourceFile, statement, ts.makeImport(/*name*/ undefined, /*namedImports*/ undefined, expression.arguments[0], quotePreference));
                             }
                             return false;
                         }
@@ -100862,7 +102166,7 @@ var ts;
                     return false;
             }
         }
-        function convertVariableStatement(sourceFile, statement, changes, checker, identifiers, target, preferences) {
+        function convertVariableStatement(sourceFile, statement, changes, checker, identifiers, target, quotePreference) {
             var declarationList = statement.declarationList;
             var foundImport = false;
             var newNodes = ts.flatMap(declarationList.declarations, function (decl) {
@@ -100875,11 +102179,11 @@ var ts;
                     }
                     else if (ts.isRequireCall(initializer, /*checkArgumentIsStringLiteralLike*/ true)) {
                         foundImport = true;
-                        return convertSingleImport(sourceFile, name, initializer.arguments[0], changes, checker, identifiers, target, preferences);
+                        return convertSingleImport(sourceFile, name, initializer.arguments[0], changes, checker, identifiers, target, quotePreference);
                     }
                     else if (ts.isPropertyAccessExpression(initializer) && ts.isRequireCall(initializer.expression, /*checkArgumentIsStringLiteralLike*/ true)) {
                         foundImport = true;
-                        return convertPropertyAccessImport(name, initializer.name.text, initializer.expression.arguments[0], identifiers, preferences);
+                        return convertPropertyAccessImport(name, initializer.name.text, initializer.expression.arguments[0], identifiers, quotePreference);
                     }
                 }
                 // Move it out to its own variable statement. (This will not be used if `!foundImport`)
@@ -100891,20 +102195,20 @@ var ts;
             }
         }
         /** Converts `const name = require("moduleSpecifier").propertyName` */
-        function convertPropertyAccessImport(name, propertyName, moduleSpecifier, identifiers, preferences) {
+        function convertPropertyAccessImport(name, propertyName, moduleSpecifier, identifiers, quotePreference) {
             switch (name.kind) {
                 case 180 /* ObjectBindingPattern */:
                 case 181 /* ArrayBindingPattern */: {
                     // `const [a, b] = require("c").d` --> `import { d } from "c"; const [a, b] = d;`
                     var tmp = makeUniqueName(propertyName, identifiers);
                     return [
-                        makeSingleImport(tmp, propertyName, moduleSpecifier, preferences),
+                        makeSingleImport(tmp, propertyName, moduleSpecifier, quotePreference),
                         makeConst(/*modifiers*/ undefined, name, ts.createIdentifier(tmp)),
                     ];
                 }
                 case 71 /* Identifier */:
                     // `const a = require("b").c` --> `import { c as a } from "./b";
-                    return [makeSingleImport(name.text, propertyName, moduleSpecifier, preferences)];
+                    return [makeSingleImport(name.text, propertyName, moduleSpecifier, quotePreference)];
                 default:
                     return ts.Debug.assertNever(name);
             }
@@ -101046,7 +102350,7 @@ var ts;
          * Returns nodes that will replace the variable declaration for the commonjs import.
          * May also make use `changes` to remove qualifiers at the use sites of imports, to change `mod.x` to `x`.
          */
-        function convertSingleImport(file, name, moduleSpecifier, changes, checker, identifiers, target, preferences) {
+        function convertSingleImport(file, name, moduleSpecifier, changes, checker, identifiers, target, quotePreference) {
             switch (name.kind) {
                 case 180 /* ObjectBindingPattern */: {
                     var importSpecifiers = ts.mapAllOrFail(name.elements, function (e) {
@@ -101055,7 +102359,7 @@ var ts;
                             : makeImportSpecifier(e.propertyName && e.propertyName.text, e.name.text);
                     }); // tslint:disable-line no-unnecessary-type-assertion (TODO: GH#18217)
                     if (importSpecifiers) {
-                        return [ts.makeImport(/*name*/ undefined, importSpecifiers, moduleSpecifier, preferences)];
+                        return [ts.makeImport(/*name*/ undefined, importSpecifiers, moduleSpecifier, quotePreference)];
                     }
                 }
                 // falls through -- object destructuring has an interesting pattern and must be a variable declaration
@@ -101066,12 +102370,12 @@ var ts;
                     */
                     var tmp = makeUniqueName(codefix.moduleSpecifierToValidIdentifier(moduleSpecifier.text, target), identifiers);
                     return [
-                        ts.makeImport(ts.createIdentifier(tmp), /*namedImports*/ undefined, moduleSpecifier, preferences),
+                        ts.makeImport(ts.createIdentifier(tmp), /*namedImports*/ undefined, moduleSpecifier, quotePreference),
                         makeConst(/*modifiers*/ undefined, ts.getSynthesizedDeepClone(name), ts.createIdentifier(tmp)),
                     ];
                 }
                 case 71 /* Identifier */:
-                    return convertSingleIdentifierImport(file, name, moduleSpecifier, changes, checker, identifiers, preferences);
+                    return convertSingleIdentifierImport(file, name, moduleSpecifier, changes, checker, identifiers, quotePreference);
                 default:
                     return ts.Debug.assertNever(name);
             }
@@ -101080,7 +102384,7 @@ var ts;
          * Convert `import x = require("x").`
          * Also converts uses like `x.y()` to `y()` and uses a named import.
          */
-        function convertSingleIdentifierImport(file, name, moduleSpecifier, changes, checker, identifiers, preferences) {
+        function convertSingleIdentifierImport(file, name, moduleSpecifier, changes, checker, identifiers, quotePreference) {
             var nameSymbol = checker.getSymbolAtLocation(name);
             // Maps from module property name to name actually used. (The same if there isn't shadowing.)
             var namedBindingsNames = ts.createMap();
@@ -101115,7 +102419,7 @@ var ts;
                 // If it was unused, ensure that we at least import *something*.
                 needDefaultImport = true;
             }
-            return [ts.makeImport(needDefaultImport ? ts.getSynthesizedDeepClone(name) : undefined, namedBindings, moduleSpecifier, preferences)];
+            return [ts.makeImport(needDefaultImport ? ts.getSynthesizedDeepClone(name) : undefined, namedBindings, moduleSpecifier, quotePreference)];
         }
         // Identifiers helpers
         function makeUniqueName(name, identifiers) {
@@ -101161,10 +102465,10 @@ var ts;
             return ts.createClassDeclaration(ts.getSynthesizedDeepClones(cls.decorators), // TODO: GH#19915 Don't think this is even legal.
             ts.concatenate(additionalModifiers, ts.getSynthesizedDeepClones(cls.modifiers)), name, ts.getSynthesizedDeepClones(cls.typeParameters), ts.getSynthesizedDeepClones(cls.heritageClauses), ts.getSynthesizedDeepClones(cls.members));
         }
-        function makeSingleImport(localName, propertyName, moduleSpecifier, preferences) {
+        function makeSingleImport(localName, propertyName, moduleSpecifier, quotePreference) {
             return propertyName === "default"
-                ? ts.makeImport(ts.createIdentifier(localName), /*namedImports*/ undefined, moduleSpecifier, preferences)
-                : ts.makeImport(/*name*/ undefined, [makeImportSpecifier(propertyName, localName)], moduleSpecifier, preferences);
+                ? ts.makeImport(ts.createIdentifier(localName), /*namedImports*/ undefined, moduleSpecifier, quotePreference)
+                : ts.makeImport(/*name*/ undefined, [makeImportSpecifier(propertyName, localName)], moduleSpecifier, quotePreference);
         }
         function makeImportSpecifier(propertyName, name) {
             return ts.createImportSpecifier(propertyName !== undefined && propertyName !== name ? ts.createIdentifier(propertyName) : undefined, ts.createIdentifier(name));
@@ -101436,7 +102740,7 @@ var ts;
             var sourceFile = context.sourceFile, symbolName = context.symbolName, preferences = context.preferences;
             var lastImportDeclaration = ts.findLast(sourceFile.statements, ts.isAnyImportSyntax);
             var moduleSpecifierWithoutQuotes = ts.stripQuotes(moduleSpecifier);
-            var quotedModuleSpecifier = ts.createLiteral(moduleSpecifierWithoutQuotes, shouldUseSingleQuote(sourceFile, preferences));
+            var quotedModuleSpecifier = ts.makeStringLiteral(moduleSpecifierWithoutQuotes, ts.getQuotePreference(sourceFile, preferences));
             var importDecl = importKind !== 3 /* Equals */
                 ? ts.createImportDeclaration(
                 /*decorators*/ undefined, 
@@ -101457,15 +102761,6 @@ var ts;
             // are there are already a new line separating code and import statements.
             return createCodeAction(ts.Diagnostics.Import_0_from_module_1, [symbolName, moduleSpecifierWithoutQuotes], changes);
         }
-        function shouldUseSingleQuote(sourceFile, preferences) {
-            if (preferences.quotePreference) {
-                return preferences.quotePreference === "single";
-            }
-            else {
-                var firstModuleSpecifier = ts.firstOrUndefined(sourceFile.imports);
-                return !!firstModuleSpecifier && !ts.isStringDoubleQuoted(firstModuleSpecifier, sourceFile);
-            }
-        }
         function createImportClauseOfKind(kind, symbolName) {
             var id = ts.createIdentifier(symbolName);
             switch (kind) {
@@ -102419,6 +103714,7 @@ var ts;
             switch (token.kind) {
                 case 71 /* Identifier */:
                     tryDeleteIdentifier(changes, sourceFile, token, deletedAncestors, checker, isFixAll);
+                    deleteAssignments(changes, sourceFile, token, checker);
                     break;
                 case 152 /* PropertyDeclaration */:
                 case 246 /* NamespaceImport */:
@@ -102430,6 +103726,15 @@ var ts;
                     tryDeleteDefault(changes, sourceFile, token, deletedAncestors);
             }
         }
+        function deleteAssignments(changes, sourceFile, token, checker) {
+            ts.FindAllReferences.Core.eachSymbolReferenceInFile(token, checker, sourceFile, function (ref) {
+                if (ref.parent.kind === 185 /* PropertyAccessExpression */)
+                    ref = ref.parent;
+                if (ref.parent.kind === 200 /* BinaryExpression */ && ref.parent.parent.kind === 216 /* ExpressionStatement */) {
+                    changes.deleteNode(sourceFile, ref.parent.parent);
+                }
+            });
+        }
         function tryDeleteDefault(changes, sourceFile, token, deletedAncestors) {
             if (ts.isDeclarationName(token)) {
                 if (deletedAncestors)
@@ -102485,15 +103790,12 @@ var ts;
                     break;
                 case 182 /* BindingElement */: {
                     var pattern = parent.parent;
-                    switch (pattern.kind) {
-                        case 181 /* ArrayBindingPattern */:
-                            changes.deleteNode(sourceFile, parent); // Don't delete ','
-                            break;
-                        case 180 /* ObjectBindingPattern */:
-                            changes.deleteNodeInList(sourceFile, parent);
-                            break;
-                        default:
-                            return ts.Debug.assertNever(pattern);
+                    var preserveComma = pattern.kind === 181 /* ArrayBindingPattern */ && parent !== ts.last(pattern.elements);
+                    if (preserveComma) {
+                        changes.deleteNode(sourceFile, parent);
+                    }
+                    else {
+                        changes.deleteNodeInList(sourceFile, parent);
                     }
                     break;
                 }
@@ -103003,8 +104305,8 @@ var ts;
                         outputMethod(signature, modifiers, name, createStubbedMethodBody(preferences));
                         break;
                     }
-                    for (var _i = 0, signatures_8 = signatures; _i < signatures_8.length; _i++) {
-                        var signature = signatures_8[_i];
+                    for (var _i = 0, signatures_1 = signatures; _i < signatures_1.length; _i++) {
+                        var signature = signatures_1[_i];
                         // Need to ensure nodes are fresh each time so they can have different positions.
                         outputMethod(signature, ts.getSynthesizedDeepClones(modifiers, /*includeTrivia*/ false), ts.getSynthesizedDeepClone(name, /*includeTrivia*/ false));
                     }
@@ -103037,11 +104339,11 @@ var ts;
             return signatureDeclaration;
         }
         function createMethodFromCallExpression(_a, methodName, inJs, makeStatic, preferences) {
-            var typeArguments = _a.typeArguments, args = _a.arguments;
+            var typeArguments = _a.typeArguments, args = _a.arguments, parent = _a.parent;
             return ts.createMethod(
             /*decorators*/ undefined, 
             /*modifiers*/ makeStatic ? [ts.createToken(115 /* StaticKeyword */)] : undefined, 
-            /*asteriskToken*/ undefined, methodName, 
+            /*asteriskToken*/ ts.isYieldExpression(parent) ? ts.createToken(39 /* AsteriskToken */) : undefined, methodName, 
             /*questionToken*/ undefined, 
             /*typeParameters*/ inJs ? undefined : ts.map(typeArguments, function (_, i) {
                 return ts.createTypeParameterDeclaration(84 /* T */ + typeArguments.length - 1 <= 90 /* Z */ ? String.fromCharCode(84 /* T */ + i) : "T" + i);
@@ -103073,8 +104375,8 @@ var ts;
             var maxArgsSignature = signatures[0];
             var minArgumentCount = signatures[0].minArgumentCount;
             var someSigHasRestParameter = false;
-            for (var _i = 0, signatures_9 = signatures; _i < signatures_9.length; _i++) {
-                var sig = signatures_9[_i];
+            for (var _i = 0, signatures_2 = signatures; _i < signatures_2.length; _i++) {
+                var sig = signatures_2[_i];
                 minArgumentCount = Math.min(sig.minArgumentCount, minArgumentCount);
                 if (sig.hasRestParameter) {
                     someSigHasRestParameter = true;
@@ -103595,7 +104897,7 @@ var ts;
                     return checker.createArrayType(getParameterTypeFromCallContexts(0, usageContext.properties.get("push").callContexts, /*isRestParameter*/ false, checker));
                 }
                 else if (usageContext.properties || usageContext.callContexts || usageContext.constructContexts || usageContext.numberIndexContext || usageContext.stringIndexContext) {
-                    var members_6 = ts.createUnderscoreEscapedMap();
+                    var members_1 = ts.createUnderscoreEscapedMap();
                     var callSignatures = [];
                     var constructSignatures = [];
                     var stringIndexInfo = void 0;
@@ -103604,7 +104906,7 @@ var ts;
                         usageContext.properties.forEach(function (context, name) {
                             var symbol = checker.createSymbol(4 /* Property */, name);
                             symbol.type = getTypeFromUsageContext(context, checker) || checker.getAnyType();
-                            members_6.set(name, symbol);
+                            members_1.set(name, symbol);
                         });
                     }
                     if (usageContext.callContexts) {
@@ -103625,7 +104927,7 @@ var ts;
                     if (usageContext.stringIndexContext) {
                         stringIndexInfo = checker.createIndexInfo(getTypeFromUsageContext(usageContext.stringIndexContext, checker), /*isReadonly*/ false);
                     }
-                    return checker.createAnonymousType(/*symbol*/ undefined, members_6, callSignatures, constructSignatures, stringIndexInfo, numberIndexInfo); // TODO: GH#18217
+                    return checker.createAnonymousType(/*symbol*/ undefined, members_1, callSignatures, constructSignatures, stringIndexInfo, numberIndexInfo); // TODO: GH#18217
                 }
                 else {
                     return undefined;
@@ -103702,7 +105004,7 @@ var ts;
             var opts = context.program.getCompilerOptions();
             var variations = [];
             // import Bluebird from "bluebird";
-            variations.push(createAction(context, sourceFile, node, ts.makeImport(namespace.name, /*namedImports*/ undefined, node.moduleSpecifier, context.preferences)));
+            variations.push(createAction(context, sourceFile, node, ts.makeImport(namespace.name, /*namedImports*/ undefined, node.moduleSpecifier, ts.getQuotePreference(sourceFile, context.preferences))));
             if (ts.getEmitModuleKind(opts) === ts.ModuleKind.CommonJS) {
                 // import Bluebird = require("bluebird");
                 variations.push(createAction(context, sourceFile, node, ts.createImportEqualsDeclaration(
@@ -103832,14 +105134,8 @@ var ts;
             return getDefaultValueFromType(checker, checker.getTypeFromTypeNode(propertyDeclaration.type)); // TODO: GH#18217
         }
         function getDefaultValueFromType(checker, type) {
-            if (type.flags & 4 /* String */) {
-                return ts.createLiteral("");
-            }
-            else if (type.flags & 8 /* Number */) {
-                return ts.createNumericLiteral("0");
-            }
-            else if (type.flags & 16 /* Boolean */) {
-                return ts.createFalse();
+            if (type.flags & 256 /* BooleanLiteral */) {
+                return type === checker.getFalseType() ? ts.createFalse() : ts.createTrue();
             }
             else if (type.isLiteral()) {
                 return ts.createLiteral(type.value);
@@ -103856,307 +105152,13 @@ var ts;
                     return undefined;
                 return ts.createNew(ts.createIdentifier(type.symbol.name), /*typeArguments*/ undefined, /*argumentsArray*/ undefined);
             }
+            else if (checker.isArrayLikeType(type)) {
+                return ts.createArrayLiteral();
+            }
             return undefined;
         }
     })(codefix = ts.codefix || (ts.codefix = {}));
 })(ts || (ts = {}));
-// Used by importFixes to synthesize import module specifiers.
-/* @internal */
-var ts;
-(function (ts) {
-    var moduleSpecifiers;
-    (function (moduleSpecifiers) {
-        // Note: fromSourceFile is just for usesJsExtensionOnImports
-        function getModuleSpecifier(program, fromSourceFile, fromSourceFileName, toFileName, host, preferences) {
-            var info = getInfo(program.getCompilerOptions(), fromSourceFile, fromSourceFileName, host);
-            var compilerOptions = program.getCompilerOptions();
-            return getGlobalModuleSpecifier(toFileName, info, host, compilerOptions) ||
-                ts.first(getLocalModuleSpecifiers(toFileName, info, compilerOptions, preferences));
-        }
-        moduleSpecifiers.getModuleSpecifier = getModuleSpecifier;
-        // For each symlink/original for a module, returns a list of ways to import that file.
-        function getModuleSpecifiers(moduleSymbol, program, importingSourceFile, host, preferences) {
-            var ambient = tryGetModuleNameFromAmbientModule(moduleSymbol);
-            if (ambient)
-                return [[ambient]];
-            var compilerOptions = program.getCompilerOptions();
-            var info = getInfo(compilerOptions, importingSourceFile, importingSourceFile.fileName, host);
-            var modulePaths = getAllModulePaths(program, moduleSymbol.valueDeclaration.getSourceFile());
-            var global = ts.mapDefined(modulePaths, function (moduleFileName) { return getGlobalModuleSpecifier(moduleFileName, info, host, compilerOptions); });
-            return global.length ? global.map(function (g) { return [g]; }) : modulePaths.map(function (moduleFileName) {
-                return getLocalModuleSpecifiers(moduleFileName, info, compilerOptions, preferences);
-            });
-        }
-        moduleSpecifiers.getModuleSpecifiers = getModuleSpecifiers;
-        // importingSourceFileName is separate because getEditsForFileRename may need to specify an updated path
-        function getInfo(compilerOptions, importingSourceFile, importingSourceFileName, host) {
-            var moduleResolutionKind = ts.getEmitModuleResolutionKind(compilerOptions);
-            var addJsExtension = usesJsExtensionOnImports(importingSourceFile);
-            var getCanonicalFileName = ts.hostGetCanonicalFileName(host);
-            var sourceDirectory = ts.getDirectoryPath(importingSourceFileName);
-            return { moduleResolutionKind: moduleResolutionKind, addJsExtension: addJsExtension, getCanonicalFileName: getCanonicalFileName, sourceDirectory: sourceDirectory };
-        }
-        function getGlobalModuleSpecifier(moduleFileName, _a, host, compilerOptions) {
-            var addJsExtension = _a.addJsExtension, getCanonicalFileName = _a.getCanonicalFileName, sourceDirectory = _a.sourceDirectory;
-            return tryGetModuleNameFromTypeRoots(compilerOptions, host, getCanonicalFileName, moduleFileName, addJsExtension)
-                || tryGetModuleNameAsNodeModule(compilerOptions, moduleFileName, host, getCanonicalFileName, sourceDirectory)
-                || compilerOptions.rootDirs && tryGetModuleNameFromRootDirs(compilerOptions.rootDirs, moduleFileName, sourceDirectory, getCanonicalFileName);
-        }
-        function getLocalModuleSpecifiers(moduleFileName, _a, compilerOptions, preferences) {
-            var moduleResolutionKind = _a.moduleResolutionKind, addJsExtension = _a.addJsExtension, getCanonicalFileName = _a.getCanonicalFileName, sourceDirectory = _a.sourceDirectory;
-            var baseUrl = compilerOptions.baseUrl, paths = compilerOptions.paths;
-            var relativePath = removeExtensionAndIndexPostFix(ts.ensurePathIsNonModuleName(ts.getRelativePathFromDirectory(sourceDirectory, moduleFileName, getCanonicalFileName)), moduleResolutionKind, addJsExtension);
-            if (!baseUrl || preferences.importModuleSpecifierPreference === "relative") {
-                return [relativePath];
-            }
-            var relativeToBaseUrl = getRelativePathIfInDirectory(moduleFileName, baseUrl, getCanonicalFileName);
-            if (!relativeToBaseUrl) {
-                return [relativePath];
-            }
-            var importRelativeToBaseUrl = removeExtensionAndIndexPostFix(relativeToBaseUrl, moduleResolutionKind, addJsExtension);
-            if (paths) {
-                var fromPaths = tryGetModuleNameFromPaths(ts.removeFileExtension(relativeToBaseUrl), importRelativeToBaseUrl, paths);
-                if (fromPaths) {
-                    return [fromPaths];
-                }
-            }
-            if (preferences.importModuleSpecifierPreference === "non-relative") {
-                return [importRelativeToBaseUrl];
-            }
-            if (preferences.importModuleSpecifierPreference !== undefined)
-                ts.Debug.assertNever(preferences.importModuleSpecifierPreference);
-            if (isPathRelativeToParent(relativeToBaseUrl)) {
-                return [relativePath];
-            }
-            /*
-            Prefer a relative import over a baseUrl import if it doesn't traverse up to baseUrl.
-    
-            Suppose we have:
-                baseUrl = /base
-                sourceDirectory = /base/a/b
-                moduleFileName = /base/foo/bar
-            Then:
-                relativePath = ../../foo/bar
-                getRelativePathNParents(relativePath) = 2
-                pathFromSourceToBaseUrl = ../../
-                getRelativePathNParents(pathFromSourceToBaseUrl) = 2
-                2 < 2 = false
-            In this case we should prefer using the baseUrl path "/a/b" instead of the relative path "../../foo/bar".
-    
-            Suppose we have:
-                baseUrl = /base
-                sourceDirectory = /base/foo/a
-                moduleFileName = /base/foo/bar
-            Then:
-                relativePath = ../a
-                getRelativePathNParents(relativePath) = 1
-                pathFromSourceToBaseUrl = ../../
-                getRelativePathNParents(pathFromSourceToBaseUrl) = 2
-                1 < 2 = true
-            In this case we should prefer using the relative path "../a" instead of the baseUrl path "foo/a".
-            */
-            var pathFromSourceToBaseUrl = ts.ensurePathIsNonModuleName(ts.getRelativePathFromDirectory(sourceDirectory, baseUrl, getCanonicalFileName));
-            var relativeFirst = getRelativePathNParents(relativePath) < getRelativePathNParents(pathFromSourceToBaseUrl);
-            return relativeFirst ? [relativePath, importRelativeToBaseUrl] : [importRelativeToBaseUrl, relativePath];
-        }
-        function usesJsExtensionOnImports(_a) {
-            var imports = _a.imports;
-            return ts.firstDefined(imports, function (_a) {
-                var text = _a.text;
-                return ts.pathIsRelative(text) ? ts.fileExtensionIs(text, ".js" /* Js */) : undefined;
-            }) || false;
-        }
-        /**
-         * Looks for a existing imports that use symlinks to this module.
-         * Only if no symlink is available, the real path will be used.
-         */
-        function getAllModulePaths(program, _a) {
-            var fileName = _a.fileName;
-            var symlinks = ts.mapDefined(program.getSourceFiles(), function (sf) {
-                return sf.resolvedModules && ts.firstDefinedIterator(sf.resolvedModules.values(), function (res) {
-                    return res && res.resolvedFileName === fileName ? res.originalPath : undefined;
-                });
-            });
-            return symlinks.length === 0 ? [fileName] : symlinks;
-        }
-        function getRelativePathNParents(relativePath) {
-            var components = ts.getPathComponents(relativePath);
-            if (components[0] || components.length === 1)
-                return 0;
-            for (var i = 1; i < components.length; i++) {
-                if (components[i] !== "..")
-                    return i - 1;
-            }
-            return components.length - 1;
-        }
-        function tryGetModuleNameFromAmbientModule(moduleSymbol) {
-            var decl = moduleSymbol.valueDeclaration;
-            if (ts.isModuleDeclaration(decl) && ts.isStringLiteral(decl.name)) {
-                return decl.name.text;
-            }
-        }
-        function tryGetModuleNameFromPaths(relativeToBaseUrlWithIndex, relativeToBaseUrl, paths) {
-            for (var key in paths) {
-                for (var _i = 0, _a = paths[key]; _i < _a.length; _i++) {
-                    var patternText_1 = _a[_i];
-                    var pattern = ts.removeFileExtension(ts.normalizePath(patternText_1));
-                    var indexOfStar = pattern.indexOf("*");
-                    if (indexOfStar === 0 && pattern.length === 1) {
-                        continue;
-                    }
-                    else if (indexOfStar !== -1) {
-                        var prefix = pattern.substr(0, indexOfStar);
-                        var suffix = pattern.substr(indexOfStar + 1);
-                        if (relativeToBaseUrl.length >= prefix.length + suffix.length &&
-                            ts.startsWith(relativeToBaseUrl, prefix) &&
-                            ts.endsWith(relativeToBaseUrl, suffix)) {
-                            var matchedStar = relativeToBaseUrl.substr(prefix.length, relativeToBaseUrl.length - suffix.length);
-                            return key.replace("*", matchedStar);
-                        }
-                    }
-                    else if (pattern === relativeToBaseUrl || pattern === relativeToBaseUrlWithIndex) {
-                        return key;
-                    }
-                }
-            }
-        }
-        function tryGetModuleNameFromRootDirs(rootDirs, moduleFileName, sourceDirectory, getCanonicalFileName) {
-            var normalizedTargetPath = getPathRelativeToRootDirs(moduleFileName, rootDirs, getCanonicalFileName);
-            if (normalizedTargetPath === undefined) {
-                return undefined;
-            }
-            var normalizedSourcePath = getPathRelativeToRootDirs(sourceDirectory, rootDirs, getCanonicalFileName);
-            var relativePath = normalizedSourcePath !== undefined ? ts.ensurePathIsNonModuleName(ts.getRelativePathFromDirectory(normalizedSourcePath, normalizedTargetPath, getCanonicalFileName)) : normalizedTargetPath;
-            return ts.removeFileExtension(relativePath);
-        }
-        function tryGetModuleNameFromTypeRoots(options, host, getCanonicalFileName, moduleFileName, addJsExtension) {
-            var roots = ts.getEffectiveTypeRoots(options, host);
-            return ts.firstDefined(roots, function (unNormalizedTypeRoot) {
-                var typeRoot = ts.toPath(unNormalizedTypeRoot, /*basePath*/ undefined, getCanonicalFileName);
-                if (ts.startsWith(moduleFileName, typeRoot)) {
-                    // For a type definition, we can strip `/index` even with classic resolution.
-                    return removeExtensionAndIndexPostFix(moduleFileName.substring(typeRoot.length + 1), ts.ModuleResolutionKind.NodeJs, addJsExtension);
-                }
-            });
-        }
-        function tryGetModuleNameAsNodeModule(options, moduleFileName, host, getCanonicalFileName, sourceDirectory) {
-            if (ts.getEmitModuleResolutionKind(options) !== ts.ModuleResolutionKind.NodeJs) {
-                // nothing to do here
-                return undefined;
-            }
-            var parts = getNodeModulePathParts(moduleFileName);
-            if (!parts) {
-                return undefined;
-            }
-            // Simplify the full file path to something that can be resolved by Node.
-            // If the module could be imported by a directory name, use that directory's name
-            var moduleSpecifier = getDirectoryOrExtensionlessFileName(moduleFileName);
-            // Get a path that's relative to node_modules or the importing file's path
-            // if node_modules folder is in this folder or any of its parent folders, no need to keep it.
-            if (!ts.startsWith(sourceDirectory, moduleSpecifier.substring(0, parts.topLevelNodeModulesIndex)))
-                return undefined;
-            // If the module was found in @types, get the actual Node package name
-            return ts.getPackageNameFromAtTypesDirectory(moduleSpecifier.substring(parts.topLevelPackageNameIndex + 1));
-            function getDirectoryOrExtensionlessFileName(path) {
-                // If the file is the main module, it can be imported by the package name
-                var packageRootPath = path.substring(0, parts.packageRootIndex);
-                var packageJsonPath = ts.combinePaths(packageRootPath, "package.json");
-                if (host.fileExists(packageJsonPath)) { // TODO: GH#18217
-                    var packageJsonContent = JSON.parse(host.readFile(packageJsonPath));
-                    if (packageJsonContent) {
-                        var mainFileRelative = packageJsonContent.typings || packageJsonContent.types || packageJsonContent.main;
-                        if (mainFileRelative) {
-                            var mainExportFile = ts.toPath(mainFileRelative, packageRootPath, getCanonicalFileName);
-                            if (mainExportFile === getCanonicalFileName(path)) {
-                                return packageRootPath;
-                            }
-                        }
-                    }
-                }
-                // We still have a file name - remove the extension
-                var fullModulePathWithoutExtension = ts.removeFileExtension(path);
-                // If the file is /index, it can be imported by its directory name
-                if (getCanonicalFileName(fullModulePathWithoutExtension.substring(parts.fileNameIndex)) === "/index") {
-                    return fullModulePathWithoutExtension.substring(0, parts.fileNameIndex);
-                }
-                return fullModulePathWithoutExtension;
-            }
-        }
-        function getNodeModulePathParts(fullPath) {
-            // If fullPath can't be valid module file within node_modules, returns undefined.
-            // Example of expected pattern: /base/path/node_modules/[@scope/otherpackage/@otherscope/node_modules/]package/[subdirectory/]file.js
-            // Returns indices:                       ^            ^                                                      ^             ^
-            var topLevelNodeModulesIndex = 0;
-            var topLevelPackageNameIndex = 0;
-            var packageRootIndex = 0;
-            var fileNameIndex = 0;
-            var States;
-            (function (States) {
-                States[States["BeforeNodeModules"] = 0] = "BeforeNodeModules";
-                States[States["NodeModules"] = 1] = "NodeModules";
-                States[States["Scope"] = 2] = "Scope";
-                States[States["PackageContent"] = 3] = "PackageContent";
-            })(States || (States = {}));
-            var partStart = 0;
-            var partEnd = 0;
-            var state = 0 /* BeforeNodeModules */;
-            while (partEnd >= 0) {
-                partStart = partEnd;
-                partEnd = fullPath.indexOf("/", partStart + 1);
-                switch (state) {
-                    case 0 /* BeforeNodeModules */:
-                        if (fullPath.indexOf("/node_modules/", partStart) === partStart) {
-                            topLevelNodeModulesIndex = partStart;
-                            topLevelPackageNameIndex = partEnd;
-                            state = 1 /* NodeModules */;
-                        }
-                        break;
-                    case 1 /* NodeModules */:
-                    case 2 /* Scope */:
-                        if (state === 1 /* NodeModules */ && fullPath.charAt(partStart + 1) === "@") {
-                            state = 2 /* Scope */;
-                        }
-                        else {
-                            packageRootIndex = partEnd;
-                            state = 3 /* PackageContent */;
-                        }
-                        break;
-                    case 3 /* PackageContent */:
-                        if (fullPath.indexOf("/node_modules/", partStart) === partStart) {
-                            state = 1 /* NodeModules */;
-                        }
-                        else {
-                            state = 3 /* PackageContent */;
-                        }
-                        break;
-                }
-            }
-            fileNameIndex = partStart;
-            return state > 1 /* NodeModules */ ? { topLevelNodeModulesIndex: topLevelNodeModulesIndex, topLevelPackageNameIndex: topLevelPackageNameIndex, packageRootIndex: packageRootIndex, fileNameIndex: fileNameIndex } : undefined;
-        }
-        function getPathRelativeToRootDirs(path, rootDirs, getCanonicalFileName) {
-            return ts.firstDefined(rootDirs, function (rootDir) {
-                var relativePath = getRelativePathIfInDirectory(path, rootDir, getCanonicalFileName); // TODO: GH#18217
-                return isPathRelativeToParent(relativePath) ? undefined : relativePath;
-            });
-        }
-        function removeExtensionAndIndexPostFix(fileName, moduleResolutionKind, addJsExtension) {
-            var noExtension = ts.removeFileExtension(fileName);
-            return addJsExtension
-                ? noExtension + ".js"
-                : moduleResolutionKind === ts.ModuleResolutionKind.NodeJs
-                    ? ts.removeSuffix(noExtension, "/index")
-                    : noExtension;
-        }
-        function getRelativePathIfInDirectory(path, directoryPath, getCanonicalFileName) {
-            var relativePath = ts.getRelativePathToDirectoryOrUrl(directoryPath, path, directoryPath, getCanonicalFileName, /*isAbsolutePathAnUrl*/ false);
-            return ts.isRootedDiskPath(relativePath) ? undefined : relativePath;
-        }
-        function isPathRelativeToParent(path) {
-            return ts.startsWith(path, "..");
-        }
-    })(moduleSpecifiers = ts.moduleSpecifiers || (ts.moduleSpecifiers = {}));
-})(ts || (ts = {}));
 /* @internal */
 var ts;
 (function (ts) {
@@ -104226,7 +105228,7 @@ var ts;
             }
         }
         function doChange(changes, sourceFile, info, preferences) {
-            changes.replaceNode(sourceFile, info.importNode, ts.makeImport(info.name, /*namedImports*/ undefined, info.moduleSpecifier, preferences));
+            changes.replaceNode(sourceFile, info.importNode, ts.makeImport(info.name, /*namedImports*/ undefined, info.moduleSpecifier, ts.getQuotePreference(sourceFile, preferences)));
         }
     })(codefix = ts.codefix || (ts.codefix = {}));
 })(ts || (ts = {}));
@@ -104412,7 +105414,7 @@ var ts;
                 });
                 var namespaceImportName = namespaceNameConflicts ? ts.getUniqueName(preferredName, sourceFile) : preferredName;
                 var neededNamedImports = [];
-                var _loop_22 = function (element) {
+                var _loop_11 = function (element) {
                     var propertyName = (element.propertyName || element.name).text;
                     ts.FindAllReferences.Core.eachSymbolReferenceInFile(element.name, checker, sourceFile, function (id) {
                         var access = ts.createPropertyAccess(ts.createIdentifier(namespaceImportName), propertyName);
@@ -104431,7 +105433,7 @@ var ts;
                 };
                 for (var _i = 0, _a = toConvert.elements; _i < _a.length; _i++) {
                     var element = _a[_i];
-                    _loop_22(element);
+                    _loop_11(element);
                 }
                 changes.replaceNode(sourceFile, toConvert, ts.createNamespaceImport(ts.createIdentifier(namespaceImportName)));
                 if (neededNamedImports.length) {
@@ -105490,8 +106492,8 @@ var ts;
                 ts.Debug.assert(members.length > 0); // There must be at least one child, since we extracted from one.
                 var prevMember;
                 var allProperties = true;
-                for (var _i = 0, members_7 = members; _i < members_7.length; _i++) {
-                    var member = members_7[_i];
+                for (var _i = 0, members_2 = members; _i < members_2.length; _i++) {
+                    var member = members_2[_i];
                     if (member.pos > maxPos) {
                         return prevMember || members[0];
                     }
@@ -105665,7 +106667,7 @@ var ts;
                         : ts.getEnclosingBlockScopeContainer(scopes[0]);
                     ts.forEachChild(containingLexicalScopeOfExtraction, checkForUsedDeclarations);
                 }
-                var _loop_23 = function (i) {
+                var _loop_12 = function (i) {
                     var scopeUsages = usagesPerScope[i];
                     // Special case: in the innermost scope, all usages are available.
                     // (The computed value reflects the value at the top-level of the scope, but the
@@ -105705,7 +106707,7 @@ var ts;
                     }
                 };
                 for (var i = 0; i < scopes.length; i++) {
-                    _loop_23(i);
+                    _loop_12(i);
                 }
                 return { target: target, usagesPerScope: usagesPerScope, functionErrorsPerScope: functionErrorsPerScope, constantErrorsPerScope: constantErrorsPerScope, exposedVariableDeclarations: exposedVariableDeclarations };
                 function isInGenericContext(node) {
@@ -106230,14 +107232,15 @@ var ts;
                 return toMove.all;
             }
             var useEs6ModuleSyntax = !!oldFile.externalModuleIndicator;
-            var importsFromNewFile = createOldFileImportsFromNewFile(usage.oldFileImportsFromNewFile, newModuleName, useEs6ModuleSyntax, preferences);
+            var quotePreference = ts.getQuotePreference(oldFile, preferences);
+            var importsFromNewFile = createOldFileImportsFromNewFile(usage.oldFileImportsFromNewFile, newModuleName, useEs6ModuleSyntax, quotePreference);
             if (importsFromNewFile) {
                 changes.insertNodeBefore(oldFile, oldFile.statements[0], importsFromNewFile, /*blankLineBetween*/ true);
             }
             deleteUnusedOldImports(oldFile, toMove.all, changes, usage.unusedImportsFromOldFile, checker);
             deleteMovedStatements(oldFile, toMove.ranges, changes);
             updateImportsInOtherFiles(changes, program, oldFile, usage.movedSymbols, newModuleName);
-            return getNewFileImportsAndAddExportInOldFile(oldFile, usage.oldImportsNeededByNewFile, usage.newFileImportsFromOldFile, changes, checker, useEs6ModuleSyntax, preferences).concat(addExports(oldFile, toMove.all, usage.oldFileImportsFromNewFile, useEs6ModuleSyntax));
+            return getNewFileImportsAndAddExportInOldFile(oldFile, usage.oldImportsNeededByNewFile, usage.newFileImportsFromOldFile, changes, checker, useEs6ModuleSyntax, quotePreference).concat(addExports(oldFile, toMove.all, usage.oldFileImportsFromNewFile, useEs6ModuleSyntax));
         }
         function deleteMovedStatements(sourceFile, moved, changes) {
             for (var _i = 0, moved_1 = moved; _i < moved_1.length; _i++) {
@@ -106255,10 +107258,10 @@ var ts;
         }
         function updateImportsInOtherFiles(changes, program, oldFile, movedSymbols, newModuleName) {
             var checker = program.getTypeChecker();
-            var _loop_24 = function (sourceFile) {
+            var _loop_13 = function (sourceFile) {
                 if (sourceFile === oldFile)
                     return "continue";
-                var _loop_25 = function (statement) {
+                var _loop_14 = function (statement) {
                     forEachImportInStatement(statement, function (importNode) {
                         if (checker.getSymbolAtLocation(moduleSpecifierFromImport(importNode)) !== oldFile.symbol)
                             return;
@@ -106280,12 +107283,12 @@ var ts;
                 };
                 for (var _i = 0, _a = sourceFile.statements; _i < _a.length; _i++) {
                     var statement = _a[_i];
-                    _loop_25(statement);
+                    _loop_14(statement);
                 }
             };
             for (var _i = 0, _a = program.getSourceFiles(); _i < _a.length; _i++) {
                 var sourceFile = _a[_i];
-                _loop_24(sourceFile);
+                _loop_13(sourceFile);
             }
         }
         function getNamespaceLikeImport(node) {
@@ -106361,7 +107364,7 @@ var ts;
                 }
             }
         }
-        function createOldFileImportsFromNewFile(newFileNeedExport, newFileNameWithExtension, useEs6Imports, preferences) {
+        function createOldFileImportsFromNewFile(newFileNeedExport, newFileNameWithExtension, useEs6Imports, quotePreference) {
             var defaultImport;
             var imports = [];
             newFileNeedExport.forEach(function (symbol) {
@@ -106372,13 +107375,13 @@ var ts;
                     imports.push(symbol.name);
                 }
             });
-            return makeImportOrRequire(defaultImport, imports, newFileNameWithExtension, useEs6Imports, preferences);
+            return makeImportOrRequire(defaultImport, imports, newFileNameWithExtension, useEs6Imports, quotePreference);
         }
-        function makeImportOrRequire(defaultImport, imports, path, useEs6Imports, preferences) {
+        function makeImportOrRequire(defaultImport, imports, path, useEs6Imports, quotePreference) {
             path = ts.ensurePathIsNonModuleName(path);
             if (useEs6Imports) {
                 var specifiers = imports.map(function (i) { return ts.createImportSpecifier(/*propertyName*/ undefined, ts.createIdentifier(i)); });
-                return ts.makeImportIfNecessary(defaultImport, specifiers, path, preferences);
+                return ts.makeImportIfNecessary(defaultImport, specifiers, path, quotePreference);
             }
             else {
                 ts.Debug.assert(!defaultImport); // If there's a default export, it should have been an es6 module.
@@ -106400,9 +107403,9 @@ var ts;
                 if (isTopLevelDeclarationStatement(statement) &&
                     !isExported(sourceFile, statement, useEs6Exports) &&
                     forEachTopLevelDeclaration(statement, function (d) { return needExport.has(ts.Debug.assertDefined(d.symbol)); })) {
-                    var exports_2 = addExport(statement, useEs6Exports);
-                    if (exports_2)
-                        return exports_2;
+                    var exports = addExport(statement, useEs6Exports);
+                    if (exports)
+                        return exports;
                 }
                 return statement;
             });
@@ -106477,7 +107480,7 @@ var ts;
                     break;
             }
         }
-        function getNewFileImportsAndAddExportInOldFile(oldFile, importsToCopy, newFileImportsFromOldFile, changes, checker, useEs6ModuleSyntax, preferences) {
+        function getNewFileImportsAndAddExportInOldFile(oldFile, importsToCopy, newFileImportsFromOldFile, changes, checker, useEs6ModuleSyntax, quotePreference) {
             var copiedOldImports = [];
             for (var _i = 0, _a = oldFile.statements; _i < _a.length; _i++) {
                 var oldStatement = _a[_i];
@@ -106509,7 +107512,7 @@ var ts;
                     }
                 }
             });
-            ts.append(copiedOldImports, makeImportOrRequire(oldFileDefault, oldFileNamedImports, ts.removeFileExtension(ts.getBaseFileName(oldFile.fileName)), useEs6ModuleSyntax, preferences));
+            ts.append(copiedOldImports, makeImportOrRequire(oldFileDefault, oldFileNamedImports, ts.removeFileExtension(ts.getBaseFileName(oldFile.fileName)), useEs6ModuleSyntax, quotePreference));
             return copiedOldImports;
         }
         function makeUniqueModuleName(moduleName, extension, inDirectory, host) {
@@ -107188,8 +108191,8 @@ var ts;
         var list = createNode(299 /* SyntaxList */, nodes.pos, nodes.end, parent);
         list._children = [];
         var pos = nodes.pos;
-        for (var _i = 0, nodes_7 = nodes; _i < nodes_7.length; _i++) {
-            var node = nodes_7[_i];
+        for (var _i = 0, nodes_1 = nodes; _i < nodes_1.length; _i++) {
+            var node = nodes_1[_i];
             addSyntheticNodes(list._children, pos, node.pos, parent);
             list._children.push(node);
             pos = node.end;
@@ -107372,7 +108375,7 @@ var ts;
             return !!(this.flags & 786432 /* UnionOrIntersection */);
         };
         TypeObject.prototype.isLiteral = function () {
-            return !!(this.flags & 448 /* Literal */);
+            return !!(this.flags & 192 /* StringOrNumberLiteral */);
         };
         TypeObject.prototype.isStringLiteral = function () {
             return !!(this.flags & 64 /* StringLiteral */);
@@ -107431,8 +108434,8 @@ var ts;
             return ts.emptyArray;
         var doc = ts.JsDoc.getJsDocCommentsFromDeclarations(declarations);
         if (doc.length === 0 || declarations.some(hasJSDocInheritDocTag)) {
-            for (var _i = 0, declarations_14 = declarations; _i < declarations_14.length; _i++) {
-                var declaration = declarations_14[_i];
+            for (var _i = 0, declarations_5 = declarations; _i < declarations_5.length; _i++) {
+                var declaration = declarations_5[_i];
                 var inheritedDocs = findInheritedJSDocComments(declaration, declaration.symbol.name, checker); // TODO: GH#18217
                 // TODO: GH#16312 Return a ReadonlyArray, avoid copying inheritedDocs
                 if (inheritedDocs)
@@ -107927,9 +108930,9 @@ var ts;
     }
     ts.createSourceFileLikeCache = createSourceFileLikeCache;
     function createLanguageService(host, documentRegistry, syntaxOnly) {
-        var _a;
         if (documentRegistry === void 0) { documentRegistry = ts.createDocumentRegistry(host.useCaseSensitiveFileNames && host.useCaseSensitiveFileNames(), host.getCurrentDirectory()); }
         if (syntaxOnly === void 0) { syntaxOnly = false; }
+        var _a;
         var syntaxTreeCache = new SyntaxTreeCache(host);
         var program;
         var lastProjectVersion;
@@ -108186,7 +109189,7 @@ var ts;
         function getQuickInfoAtPosition(fileName, position) {
             synchronizeHostData();
             var sourceFile = getValidSourceFile(fileName);
-            var node = ts.getTouchingPropertyName(sourceFile, position, /*includeJsDocComment*/ true);
+            var node = ts.getTouchingPropertyName(sourceFile, position);
             if (node === sourceFile) {
                 // Avoid giving quickInfo for the sourceFile as a whole.
                 return undefined;
@@ -108208,14 +109211,14 @@ var ts;
                     case 174 /* ThisType */:
                     case 97 /* SuperKeyword */:
                         // For the identifiers/this/super etc get the type at position
-                        var type_4 = typeChecker.getTypeAtLocation(node);
-                        return type_4 && {
+                        var type_1 = typeChecker.getTypeAtLocation(node);
+                        return type_1 && {
                             kind: "" /* unknown */,
                             kindModifiers: "" /* none */,
                             textSpan: ts.createTextSpanFromNode(node, sourceFile),
-                            displayParts: typeChecker.runWithCancellationToken(cancellationToken, function (typeChecker) { return ts.typeToDisplayParts(typeChecker, type_4, ts.getContainerNode(node)); }),
-                            documentation: type_4.symbol ? type_4.symbol.getDocumentationComment(typeChecker) : undefined,
-                            tags: type_4.symbol ? type_4.symbol.getJsDocTags() : undefined
+                            displayParts: typeChecker.runWithCancellationToken(cancellationToken, function (typeChecker) { return ts.typeToDisplayParts(typeChecker, type_1, ts.getContainerNode(node)); }),
+                            documentation: type_1.symbol ? type_1.symbol.getDocumentationComment(typeChecker) : undefined,
+                            tags: type_1.symbol ? type_1.symbol.getJsDocTags() : undefined
                         };
                 }
                 return undefined;
@@ -108324,15 +109327,15 @@ var ts;
                 if (original === void 0) { original = input; }
                 var info = extract(input);
                 if (ts.endsWith(info.fileName, ".d.ts" /* Dts */)) {
-                    var file_18 = program.getSourceFile(info.fileName);
-                    if (!file_18) {
+                    var file = program.getSourceFile(info.fileName);
+                    if (!file) {
                         var path = ts.toPath(info.fileName, currentDirectory, getCanonicalFileName);
-                        file_18 = sourcemappedFileCache.get(path);
+                        file = sourcemappedFileCache.get(path);
                     }
-                    if (!file_18) {
+                    if (!file) {
                         return input;
                     }
-                    var mapper = getSourceMapper(info.fileName, file_18);
+                    var mapper = getSourceMapper(info.fileName, file);
                     var newLoc = mapper.getOriginalPosition(info);
                     if (newLoc === info)
                         return input;
@@ -108464,7 +109467,7 @@ var ts;
         function getNameOrDottedNameSpan(fileName, startPos, _endPos) {
             var sourceFile = syntaxTreeCache.getCurrentSourceFile(fileName);
             // Get node at the location
-            var node = ts.getTouchingPropertyName(sourceFile, startPos, /*includeJsDocComment*/ false);
+            var node = ts.getTouchingPropertyName(sourceFile, startPos);
             if (node === sourceFile) {
                 return undefined;
             }
@@ -108976,20 +109979,20 @@ var ts;
     function getPropertySymbolsFromType(type, propName) {
         var name = ts.unescapeLeadingUnderscores(ts.getTextOfPropertyName(propName));
         if (name && type) {
-            var result_7 = [];
+            var result_2 = [];
             var symbol = type.getProperty(name);
             if (type.flags & 262144 /* Union */) {
                 ts.forEach(type.types, function (t) {
                     var symbol = t.getProperty(name);
                     if (symbol) {
-                        result_7.push(symbol);
+                        result_2.push(symbol);
                     }
                 });
-                return result_7;
+                return result_2;
             }
             if (symbol) {
-                result_7.push(symbol);
-                return result_7;
+                result_2.push(symbol);
+                return result_2;
             }
         }
         return undefined;
@@ -110277,7 +111280,8 @@ var ts;
                     importedFiles: _this.convertFileReferences(result.importedFiles),
                     ambientExternalModules: result.ambientExternalModules,
                     isLibFile: result.isLibFile,
-                    typeReferenceDirectives: _this.convertFileReferences(result.typeReferenceDirectives)
+                    typeReferenceDirectives: _this.convertFileReferences(result.typeReferenceDirectives),
+                    libReferenceDirectives: _this.convertFileReferences(result.libReferenceDirectives)
                 };
             });
         };
@@ -110293,8 +111297,8 @@ var ts;
                 return undefined;
             }
             var result = [];
-            for (var _i = 0, refs_2 = refs; _i < refs_2.length; _i++) {
-                var ref = refs_2[_i];
+            for (var _i = 0, refs_1 = refs; _i < refs_1.length; _i++) {
+                var ref = refs_1[_i];
                 result.push({
                     path: ts.normalizeSlashes(ref.fileName),
                     position: ref.pos,
@@ -110416,6 +111420,8 @@ var TypeScript;
 // TODO: it should be moved into a namespace though.
 /* @internal */
 var toolsVersion = ts.versionMajorMinor;
+//# sourceMappingURL=services.js.map
+"use strict";
 var ts;
 (function (ts) {
     var server;
@@ -110461,6 +111467,388 @@ var ts;
         server.nowString = nowString;
     })(server = ts.server || (ts.server = {}));
 })(ts || (ts = {}));
+/* @internal */
+var ts;
+(function (ts) {
+    var JsTyping;
+    (function (JsTyping) {
+        /* @internal */
+        function isTypingUpToDate(cachedTyping, availableTypingVersions) {
+            var availableVersion = ts.Semver.parse(ts.getProperty(availableTypingVersions, "ts" + ts.versionMajorMinor) || ts.getProperty(availableTypingVersions, "latest"));
+            return !availableVersion.greaterThan(cachedTyping.version);
+        }
+        JsTyping.isTypingUpToDate = isTypingUpToDate;
+        /* @internal */
+        JsTyping.nodeCoreModuleList = [
+            "assert",
+            "async_hooks",
+            "buffer",
+            "child_process",
+            "cluster",
+            "console",
+            "constants",
+            "crypto",
+            "dgram",
+            "dns",
+            "domain",
+            "events",
+            "fs",
+            "http",
+            "https",
+            "http2",
+            "inspector",
+            "net",
+            "os",
+            "path",
+            "perf_hooks",
+            "process",
+            "punycode",
+            "querystring",
+            "readline",
+            "repl",
+            "stream",
+            "string_decoder",
+            "timers",
+            "tls",
+            "tty",
+            "url",
+            "util",
+            "v8",
+            "vm",
+            "zlib"
+        ];
+        /* @internal */
+        JsTyping.nodeCoreModules = ts.arrayToSet(JsTyping.nodeCoreModuleList);
+        function loadSafeList(host, safeListPath) {
+            var result = ts.readConfigFile(safeListPath, function (path) { return host.readFile(path); });
+            return ts.createMapFromTemplate(result.config);
+        }
+        JsTyping.loadSafeList = loadSafeList;
+        function loadTypesMap(host, typesMapPath) {
+            var result = ts.readConfigFile(typesMapPath, function (path) { return host.readFile(path); });
+            if (result.config) {
+                return ts.createMapFromTemplate(result.config.simpleMap);
+            }
+            return undefined;
+        }
+        JsTyping.loadTypesMap = loadTypesMap;
+        /**
+         * @param host is the object providing I/O related operations.
+         * @param fileNames are the file names that belong to the same project
+         * @param projectRootPath is the path to the project root directory
+         * @param safeListPath is the path used to retrieve the safe list
+         * @param packageNameToTypingLocation is the map of package names to their cached typing locations and installed versions
+         * @param typeAcquisition is used to customize the typing acquisition process
+         * @param compilerOptions are used as a source for typing inference
+         */
+        function discoverTypings(host, log, fileNames, projectRootPath, safeList, packageNameToTypingLocation, typeAcquisition, unresolvedImports, typesRegistry) {
+            if (!typeAcquisition || !typeAcquisition.enable) {
+                return { cachedTypingPaths: [], newTypingNames: [], filesToWatch: [] };
+            }
+            // A typing name to typing file path mapping
+            var inferredTypings = ts.createMap();
+            // Only infer typings for .js and .jsx files
+            fileNames = ts.mapDefined(fileNames, function (fileName) {
+                var path = ts.normalizePath(fileName);
+                if (ts.hasJavaScriptFileExtension(path)) {
+                    return path;
+                }
+            });
+            var filesToWatch = [];
+            if (typeAcquisition.include)
+                addInferredTypings(typeAcquisition.include, "Explicitly included types");
+            var exclude = typeAcquisition.exclude || [];
+            // Directories to search for package.json, bower.json and other typing information
+            var possibleSearchDirs = ts.arrayToSet(fileNames, ts.getDirectoryPath);
+            possibleSearchDirs.set(projectRootPath, true);
+            possibleSearchDirs.forEach(function (_true, searchDir) {
+                var packageJsonPath = ts.combinePaths(searchDir, "package.json");
+                getTypingNamesFromJson(packageJsonPath, filesToWatch);
+                var bowerJsonPath = ts.combinePaths(searchDir, "bower.json");
+                getTypingNamesFromJson(bowerJsonPath, filesToWatch);
+                var bowerComponentsPath = ts.combinePaths(searchDir, "bower_components");
+                getTypingNamesFromPackagesFolder(bowerComponentsPath, filesToWatch);
+                var nodeModulesPath = ts.combinePaths(searchDir, "node_modules");
+                getTypingNamesFromPackagesFolder(nodeModulesPath, filesToWatch);
+            });
+            getTypingNamesFromSourceFileNames(fileNames);
+            // add typings for unresolved imports
+            if (unresolvedImports) {
+                var module_1 = ts.deduplicate(unresolvedImports.map(function (moduleId) { return JsTyping.nodeCoreModules.has(moduleId) ? "node" : moduleId; }), ts.equateStringsCaseSensitive, ts.compareStringsCaseSensitive);
+                addInferredTypings(module_1, "Inferred typings from unresolved imports");
+            }
+            // Add the cached typing locations for inferred typings that are already installed
+            packageNameToTypingLocation.forEach(function (typing, name) {
+                var registryEntry = typesRegistry.get(name);
+                if (inferredTypings.has(name) && inferredTypings.get(name) === undefined && registryEntry !== undefined && isTypingUpToDate(typing, registryEntry)) {
+                    inferredTypings.set(name, typing.typingLocation);
+                }
+            });
+            // Remove typings that the user has added to the exclude list
+            for (var _i = 0, exclude_1 = exclude; _i < exclude_1.length; _i++) {
+                var excludeTypingName = exclude_1[_i];
+                var didDelete = inferredTypings.delete(excludeTypingName);
+                if (didDelete && log)
+                    log("Typing for " + excludeTypingName + " is in exclude list, will be ignored.");
+            }
+            var newTypingNames = [];
+            var cachedTypingPaths = [];
+            inferredTypings.forEach(function (inferred, typing) {
+                if (inferred !== undefined) {
+                    cachedTypingPaths.push(inferred);
+                }
+                else {
+                    newTypingNames.push(typing);
+                }
+            });
+            var result = { cachedTypingPaths: cachedTypingPaths, newTypingNames: newTypingNames, filesToWatch: filesToWatch };
+            if (log)
+                log("Result: " + JSON.stringify(result));
+            return result;
+            function addInferredTyping(typingName) {
+                if (!inferredTypings.has(typingName)) {
+                    inferredTypings.set(typingName, undefined); // TODO: GH#18217
+                }
+            }
+            function addInferredTypings(typingNames, message) {
+                if (log)
+                    log(message + ": " + JSON.stringify(typingNames));
+                ts.forEach(typingNames, addInferredTyping);
+            }
+            /**
+             * Get the typing info from common package manager json files like package.json or bower.json
+             */
+            function getTypingNamesFromJson(jsonPath, filesToWatch) {
+                if (!host.fileExists(jsonPath)) {
+                    return;
+                }
+                filesToWatch.push(jsonPath);
+                var jsonConfig = ts.readConfigFile(jsonPath, function (path) { return host.readFile(path); }).config;
+                var jsonTypingNames = ts.flatMap([jsonConfig.dependencies, jsonConfig.devDependencies, jsonConfig.optionalDependencies, jsonConfig.peerDependencies], ts.getOwnKeys);
+                addInferredTypings(jsonTypingNames, "Typing names in '" + jsonPath + "' dependencies");
+            }
+            /**
+             * Infer typing names from given file names. For example, the file name "jquery-min.2.3.4.js"
+             * should be inferred to the 'jquery' typing name; and "angular-route.1.2.3.js" should be inferred
+             * to the 'angular-route' typing name.
+             * @param fileNames are the names for source files in the project
+             */
+            function getTypingNamesFromSourceFileNames(fileNames) {
+                var fromFileNames = ts.mapDefined(fileNames, function (j) {
+                    if (!ts.hasJavaScriptFileExtension(j))
+                        return undefined;
+                    var inferredTypingName = ts.removeFileExtension(ts.getBaseFileName(j.toLowerCase()));
+                    var cleanedTypingName = ts.removeMinAndVersionNumbers(inferredTypingName);
+                    return safeList.get(cleanedTypingName);
+                });
+                if (fromFileNames.length) {
+                    addInferredTypings(fromFileNames, "Inferred typings from file names");
+                }
+                var hasJsxFile = ts.some(fileNames, function (f) { return ts.fileExtensionIs(f, ".jsx" /* Jsx */); });
+                if (hasJsxFile) {
+                    if (log)
+                        log("Inferred 'react' typings due to presence of '.jsx' extension");
+                    addInferredTyping("react");
+                }
+            }
+            /**
+             * Infer typing names from packages folder (ex: node_module, bower_components)
+             * @param packagesFolderPath is the path to the packages folder
+             */
+            function getTypingNamesFromPackagesFolder(packagesFolderPath, filesToWatch) {
+                filesToWatch.push(packagesFolderPath);
+                // Todo: add support for ModuleResolutionHost too
+                if (!host.directoryExists(packagesFolderPath)) {
+                    return;
+                }
+                // depth of 2, so we access `node_modules/foo` but not `node_modules/foo/bar`
+                var fileNames = host.readDirectory(packagesFolderPath, [".json" /* Json */], /*excludes*/ undefined, /*includes*/ undefined, /*depth*/ 2);
+                if (log)
+                    log("Searching for typing names in " + packagesFolderPath + "; all files: " + JSON.stringify(fileNames));
+                var packageNames = [];
+                for (var _i = 0, fileNames_1 = fileNames; _i < fileNames_1.length; _i++) {
+                    var fileName = fileNames_1[_i];
+                    var normalizedFileName = ts.normalizePath(fileName);
+                    var baseFileName = ts.getBaseFileName(normalizedFileName);
+                    if (baseFileName !== "package.json" && baseFileName !== "bower.json") {
+                        continue;
+                    }
+                    var result_1 = ts.readConfigFile(normalizedFileName, function (path) { return host.readFile(path); });
+                    var packageJson = result_1.config;
+                    // npm 3's package.json contains a "_requiredBy" field
+                    // we should include all the top level module names for npm 2, and only module names whose
+                    // "_requiredBy" field starts with "#" or equals "/" for npm 3.
+                    if (baseFileName === "package.json" && packageJson._requiredBy &&
+                        ts.filter(packageJson._requiredBy, function (r) { return r[0] === "#" || r === "/"; }).length === 0) {
+                        continue;
+                    }
+                    // If the package has its own d.ts typings, those will take precedence. Otherwise the package name will be used
+                    // to download d.ts files from DefinitelyTyped
+                    if (!packageJson.name) {
+                        continue;
+                    }
+                    var ownTypes = packageJson.types || packageJson.typings;
+                    if (ownTypes) {
+                        var absolutePath = ts.getNormalizedAbsolutePath(ownTypes, ts.getDirectoryPath(normalizedFileName));
+                        if (log)
+                            log("    Package '" + packageJson.name + "' provides its own types.");
+                        inferredTypings.set(packageJson.name, absolutePath);
+                    }
+                    else {
+                        packageNames.push(packageJson.name);
+                    }
+                }
+                addInferredTypings(packageNames, "    Found package names");
+            }
+        }
+        JsTyping.discoverTypings = discoverTypings;
+        var PackageNameValidationResult;
+        (function (PackageNameValidationResult) {
+            PackageNameValidationResult[PackageNameValidationResult["Ok"] = 0] = "Ok";
+            PackageNameValidationResult[PackageNameValidationResult["ScopedPackagesNotSupported"] = 1] = "ScopedPackagesNotSupported";
+            PackageNameValidationResult[PackageNameValidationResult["EmptyName"] = 2] = "EmptyName";
+            PackageNameValidationResult[PackageNameValidationResult["NameTooLong"] = 3] = "NameTooLong";
+            PackageNameValidationResult[PackageNameValidationResult["NameStartsWithDot"] = 4] = "NameStartsWithDot";
+            PackageNameValidationResult[PackageNameValidationResult["NameStartsWithUnderscore"] = 5] = "NameStartsWithUnderscore";
+            PackageNameValidationResult[PackageNameValidationResult["NameContainsNonURISafeCharacters"] = 6] = "NameContainsNonURISafeCharacters";
+        })(PackageNameValidationResult = JsTyping.PackageNameValidationResult || (JsTyping.PackageNameValidationResult = {}));
+        var maxPackageNameLength = 214;
+        /**
+         * Validates package name using rules defined at https://docs.npmjs.com/files/package.json
+         */
+        function validatePackageName(packageName) {
+            if (!packageName) {
+                return 2 /* EmptyName */;
+            }
+            if (packageName.length > maxPackageNameLength) {
+                return 3 /* NameTooLong */;
+            }
+            if (packageName.charCodeAt(0) === 46 /* dot */) {
+                return 4 /* NameStartsWithDot */;
+            }
+            if (packageName.charCodeAt(0) === 95 /* _ */) {
+                return 5 /* NameStartsWithUnderscore */;
+            }
+            // check if name is scope package like: starts with @ and has one '/' in the middle
+            // scoped packages are not currently supported
+            // TODO: when support will be added we'll need to split and check both scope and package name
+            if (/^@[^/]+\/[^/]+$/.test(packageName)) {
+                return 1 /* ScopedPackagesNotSupported */;
+            }
+            if (encodeURIComponent(packageName) !== packageName) {
+                return 6 /* NameContainsNonURISafeCharacters */;
+            }
+            return 0 /* Ok */;
+        }
+        JsTyping.validatePackageName = validatePackageName;
+        function renderPackageNameValidationFailure(result, typing) {
+            switch (result) {
+                case 2 /* EmptyName */:
+                    return "Package name '" + typing + "' cannot be empty";
+                case 3 /* NameTooLong */:
+                    return "Package name '" + typing + "' should be less than " + maxPackageNameLength + " characters";
+                case 4 /* NameStartsWithDot */:
+                    return "Package name '" + typing + "' cannot start with '.'";
+                case 5 /* NameStartsWithUnderscore */:
+                    return "Package name '" + typing + "' cannot start with '_'";
+                case 1 /* ScopedPackagesNotSupported */:
+                    return "Package '" + typing + "' is scoped and currently is not supported";
+                case 6 /* NameContainsNonURISafeCharacters */:
+                    return "Package name '" + typing + "' contains non URI safe characters";
+                case 0 /* Ok */:
+                    return ts.Debug.fail(); // Shouldn't have called this.
+                default:
+                    throw ts.Debug.assertNever(result);
+            }
+        }
+        JsTyping.renderPackageNameValidationFailure = renderPackageNameValidationFailure;
+    })(JsTyping = ts.JsTyping || (ts.JsTyping = {}));
+})(ts || (ts = {}));
+/* @internal */
+var ts;
+(function (ts) {
+    function stringToInt(str) {
+        var n = parseInt(str, 10);
+        if (isNaN(n)) {
+            throw new Error("Error in parseInt(" + JSON.stringify(str) + ")");
+        }
+        return n;
+    }
+    var isPrereleaseRegex = /^(.*)-next.\d+/;
+    var prereleaseSemverRegex = /^(\d+)\.(\d+)\.0-next.(\d+)$/;
+    var semverRegex = /^(\d+)\.(\d+)\.(\d+)$/;
+    var Semver = /** @class */ (function () {
+        function Semver(major, minor, patch, 
+        /**
+         * If true, this is `major.minor.0-next.patch`.
+         * If false, this is `major.minor.patch`.
+         */
+        isPrerelease) {
+            this.major = major;
+            this.minor = minor;
+            this.patch = patch;
+            this.isPrerelease = isPrerelease;
+        }
+        Semver.parse = function (semver) {
+            var isPrerelease = isPrereleaseRegex.test(semver);
+            var result = Semver.tryParse(semver, isPrerelease);
+            if (!result) {
+                throw new Error("Unexpected semver: " + semver + " (isPrerelease: " + isPrerelease + ")");
+            }
+            return result;
+        };
+        Semver.fromRaw = function (_a) {
+            var major = _a.major, minor = _a.minor, patch = _a.patch, isPrerelease = _a.isPrerelease;
+            return new Semver(major, minor, patch, isPrerelease);
+        };
+        // This must parse the output of `versionString`.
+        Semver.tryParse = function (semver, isPrerelease) {
+            // Per the semver spec <http://semver.org/#spec-item-2>:
+            // "A normal version number MUST take the form X.Y.Z where X, Y, and Z are non-negative integers, and MUST NOT contain leading zeroes."
+            var rgx = isPrerelease ? prereleaseSemverRegex : semverRegex;
+            var match = rgx.exec(semver);
+            return match ? new Semver(stringToInt(match[1]), stringToInt(match[2]), stringToInt(match[3]), isPrerelease) : undefined;
+        };
+        Object.defineProperty(Semver.prototype, "versionString", {
+            get: function () {
+                return this.isPrerelease ? this.major + "." + this.minor + ".0-next." + this.patch : this.major + "." + this.minor + "." + this.patch;
+            },
+            enumerable: true,
+            configurable: true
+        });
+        Semver.prototype.equals = function (sem) {
+            return this.major === sem.major && this.minor === sem.minor && this.patch === sem.patch && this.isPrerelease === sem.isPrerelease;
+        };
+        Semver.prototype.greaterThan = function (sem) {
+            return this.major > sem.major || this.major === sem.major
+                && (this.minor > sem.minor || this.minor === sem.minor
+                    && (!this.isPrerelease && sem.isPrerelease || this.isPrerelease === sem.isPrerelease
+                        && this.patch > sem.patch));
+        };
+        return Semver;
+    }());
+    ts.Semver = Semver;
+})(ts || (ts = {}));
+//# sourceMappingURL=jsTyping.js.map
+"use strict";
+var __assign = (this && this.__assign) || Object.assign || function(t) {
+    for (var s, i = 1, n = arguments.length; i < n; i++) {
+        s = arguments[i];
+        for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
+            t[p] = s[p];
+    }
+    return t;
+};
+var __extends = (this && this.__extends) || (function () {
+    var extendStatics = Object.setPrototypeOf ||
+        ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
+        function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
+    return function (d, b) {
+        extendStatics(d, b);
+        function __() { this.constructor = d; }
+        d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
+    };
+})();
 var ts;
 (function (ts) {
     var server;
@@ -110473,7 +111861,6 @@ var ts;
             LogLevel[LogLevel["verbose"] = 3] = "verbose";
         })(LogLevel = server.LogLevel || (server.LogLevel = {}));
         server.emptyArray = createSortedArray();
-        // TODO: Use a const enum (https://github.com/Microsoft/TypeScript/issues/16804)
         var Msg;
         (function (Msg) {
             Msg["Err"] = "Err";
@@ -110483,7 +111870,7 @@ var ts;
         function createInstallTypingsRequest(project, typeAcquisition, unresolvedImports, cachePath) {
             return {
                 projectName: project.getProjectName(),
-                fileNames: project.getFileNames(/*excludeFilesFromExternalLibraries*/ true, /*excludeConfigFiles*/ true).concat(project.getExcludedFiles()),
+                fileNames: project.getFileNames(true, true).concat(project.getExcludedFiles()),
                 compilerOptions: project.getCompilationSettings(),
                 typeAcquisition: typeAcquisition,
                 unresolvedImports: unresolvedImports,
@@ -110564,7 +111951,6 @@ var ts;
         }
         server.createNormalizedPathMap = createNormalizedPathMap;
         function isInferredProjectName(name) {
-            // POSIX defines /dev/null as a device - there should be no file with this prefix
             return /dev\/null\/inferredProject\d+\*/.test(name);
         }
         server.isInferredProjectName = isInferredProjectName;
@@ -110573,34 +111959,25 @@ var ts;
         }
         server.makeInferredProjectName = makeInferredProjectName;
         function createSortedArray() {
-            return []; // TODO: GH#19873
+            return [];
         }
         server.createSortedArray = createSortedArray;
     })(server = ts.server || (ts.server = {}));
 })(ts || (ts = {}));
-/* @internal */
 (function (ts) {
     var server;
     (function (server) {
-        var ThrottledOperations = /** @class */ (function () {
+        var ThrottledOperations = (function () {
             function ThrottledOperations(host, logger) {
                 this.host = host;
                 this.pendingTimeouts = ts.createMap();
                 this.logger = logger.hasLevel(server.LogLevel.verbose) ? logger : undefined;
             }
-            /**
-             * Wait `number` milliseconds and then invoke `cb`.  If, while waiting, schedule
-             * is called again with the same `operationId`, cancel this operation in favor
-             * of the new one.  (Note that the amount of time the canceled operation had been
-             * waiting does not affect the amount of time that the new operation waits.)
-             */
             ThrottledOperations.prototype.schedule = function (operationId, delay, cb) {
                 var pendingTimeout = this.pendingTimeouts.get(operationId);
                 if (pendingTimeout) {
-                    // another operation was already scheduled for this id - cancel it
                     this.host.clearTimeout(pendingTimeout);
                 }
-                // schedule new operation, pass arguments
                 this.pendingTimeouts.set(operationId, this.host.setTimeout(ThrottledOperations.run, delay, this, operationId, cb));
                 if (this.logger) {
                     this.logger.info("Scheduled: " + operationId + (pendingTimeout ? ", Cancelled earlier one" : ""));
@@ -110616,7 +111993,7 @@ var ts;
             return ThrottledOperations;
         }());
         server.ThrottledOperations = ThrottledOperations;
-        var GcTimer = /** @class */ (function () {
+        var GcTimer = (function () {
             function GcTimer(host, delay, logger) {
                 this.host = host;
                 this.delay = delay;
@@ -110624,7 +112001,6 @@ var ts;
             }
             GcTimer.prototype.scheduleCollect = function () {
                 if (!this.host.gc || this.timerId !== undefined) {
-                    // no global.gc or collection was already scheduled - skip this request
                     return;
                 }
                 this.timerId = this.host.setTimeout(GcTimer.run, this.delay, this);
@@ -110632,11 +112008,11 @@ var ts;
             GcTimer.run = function (self) {
                 self.timerId = undefined;
                 var log = self.logger.hasLevel(server.LogLevel.requestTime);
-                var before = log && self.host.getMemoryUsage(); // TODO: GH#18217
-                self.host.gc(); // TODO: GH#18217
+                var before = log && self.host.getMemoryUsage();
+                self.host.gc();
                 if (log) {
-                    var after_1 = self.host.getMemoryUsage(); // TODO: GH#18217
-                    self.logger.perftrc("GC::before " + before + ", after " + after_1);
+                    var after = self.host.getMemoryUsage();
+                    self.logger.perftrc("GC::before " + before + ", after " + after);
                 }
             };
             return GcTimer;
@@ -110675,66 +112051,49 @@ var ts;
         function isNonDuplicateInSortedArray(value, index, array) {
             return index === 0 || value !== array[index - 1];
         }
-        /* @internal */
         function indent(str) {
             return "\n    " + str;
         }
         server.indent = indent;
-        /** Put stringified JSON on the next line, indented. */
-        /* @internal */
         function stringifyIndented(json) {
             return "\n    " + JSON.stringify(json);
         }
         server.stringifyIndented = stringifyIndented;
     })(server = ts.server || (ts.server = {}));
 })(ts || (ts = {}));
-// tslint:disable no-unnecessary-qualifier
-/**
- * Declaration module describing the TypeScript Server protocol
- */
 var ts;
 (function (ts) {
     var server;
     (function (server) {
         var protocol;
         (function (protocol) {
-            // NOTE: If updating this, be sure to also update `allCommandNames` in `harness/unittests/session.ts`.
             var CommandTypes;
             (function (CommandTypes) {
                 CommandTypes["JsxClosingTag"] = "jsxClosingTag";
                 CommandTypes["Brace"] = "brace";
-                /* @internal */
                 CommandTypes["BraceFull"] = "brace-full";
                 CommandTypes["BraceCompletion"] = "braceCompletion";
                 CommandTypes["GetSpanOfEnclosingComment"] = "getSpanOfEnclosingComment";
                 CommandTypes["Change"] = "change";
                 CommandTypes["Close"] = "close";
                 CommandTypes["Completions"] = "completions";
-                /* @internal */
                 CommandTypes["CompletionsFull"] = "completions-full";
                 CommandTypes["CompletionDetails"] = "completionEntryDetails";
-                /* @internal */
                 CommandTypes["CompletionDetailsFull"] = "completionEntryDetails-full";
                 CommandTypes["CompileOnSaveAffectedFileList"] = "compileOnSaveAffectedFileList";
                 CommandTypes["CompileOnSaveEmitFile"] = "compileOnSaveEmitFile";
                 CommandTypes["Configure"] = "configure";
                 CommandTypes["Definition"] = "definition";
-                /* @internal */
                 CommandTypes["DefinitionFull"] = "definition-full";
                 CommandTypes["DefinitionAndBoundSpan"] = "definitionAndBoundSpan";
-                /* @internal */
                 CommandTypes["DefinitionAndBoundSpanFull"] = "definitionAndBoundSpan-full";
                 CommandTypes["Implementation"] = "implementation";
-                /* @internal */
                 CommandTypes["ImplementationFull"] = "implementation-full";
                 CommandTypes["Exit"] = "exit";
                 CommandTypes["Format"] = "format";
                 CommandTypes["Formatonkey"] = "formatonkey";
-                /* @internal */
                 CommandTypes["FormatFull"] = "format-full";
-                /* @internal */
                 CommandTypes["FormatonkeyFull"] = "formatonkey-full";
-                /* @internal */
                 CommandTypes["FormatRangeFull"] = "formatRange-full";
                 CommandTypes["Geterr"] = "geterr";
                 CommandTypes["GeterrForProject"] = "geterrForProject";
@@ -110742,34 +112101,25 @@ var ts;
                 CommandTypes["SyntacticDiagnosticsSync"] = "syntacticDiagnosticsSync";
                 CommandTypes["SuggestionDiagnosticsSync"] = "suggestionDiagnosticsSync";
                 CommandTypes["NavBar"] = "navbar";
-                /* @internal */
                 CommandTypes["NavBarFull"] = "navbar-full";
                 CommandTypes["Navto"] = "navto";
-                /* @internal */
                 CommandTypes["NavtoFull"] = "navto-full";
                 CommandTypes["NavTree"] = "navtree";
                 CommandTypes["NavTreeFull"] = "navtree-full";
-                /** @deprecated */
                 CommandTypes["Occurrences"] = "occurrences";
                 CommandTypes["DocumentHighlights"] = "documentHighlights";
-                /* @internal */
                 CommandTypes["DocumentHighlightsFull"] = "documentHighlights-full";
                 CommandTypes["Open"] = "open";
                 CommandTypes["Quickinfo"] = "quickinfo";
-                /* @internal */
                 CommandTypes["QuickinfoFull"] = "quickinfo-full";
                 CommandTypes["References"] = "references";
-                /* @internal */
                 CommandTypes["ReferencesFull"] = "references-full";
                 CommandTypes["Reload"] = "reload";
                 CommandTypes["Rename"] = "rename";
-                /* @internal */
                 CommandTypes["RenameInfoFull"] = "rename-full";
-                /* @internal */
                 CommandTypes["RenameLocationsFull"] = "renameLocations-full";
                 CommandTypes["Saveto"] = "saveto";
                 CommandTypes["SignatureHelp"] = "signatureHelp";
-                /* @internal */
                 CommandTypes["SignatureHelpFull"] = "signatureHelp-full";
                 CommandTypes["Status"] = "status";
                 CommandTypes["TypeDefinition"] = "typeDefinition";
@@ -110779,46 +112129,32 @@ var ts;
                 CommandTypes["OpenExternalProject"] = "openExternalProject";
                 CommandTypes["OpenExternalProjects"] = "openExternalProjects";
                 CommandTypes["CloseExternalProject"] = "closeExternalProject";
-                /* @internal */
                 CommandTypes["SynchronizeProjectList"] = "synchronizeProjectList";
-                /* @internal */
                 CommandTypes["ApplyChangedToOpenFiles"] = "applyChangedToOpenFiles";
-                /* @internal */
                 CommandTypes["EncodedSemanticClassificationsFull"] = "encodedSemanticClassifications-full";
-                /* @internal */
                 CommandTypes["Cleanup"] = "cleanup";
                 CommandTypes["GetOutliningSpans"] = "getOutliningSpans";
-                /* @internal */
                 CommandTypes["GetOutliningSpansFull"] = "outliningSpans";
                 CommandTypes["TodoComments"] = "todoComments";
                 CommandTypes["Indentation"] = "indentation";
                 CommandTypes["DocCommentTemplate"] = "docCommentTemplate";
-                /* @internal */
                 CommandTypes["CompilerOptionsDiagnosticsFull"] = "compilerOptionsDiagnostics-full";
-                /* @internal */
                 CommandTypes["NameOrDottedNameSpan"] = "nameOrDottedNameSpan";
-                /* @internal */
                 CommandTypes["BreakpointStatement"] = "breakpointStatement";
                 CommandTypes["CompilerOptionsForInferredProjects"] = "compilerOptionsForInferredProjects";
                 CommandTypes["GetCodeFixes"] = "getCodeFixes";
-                /* @internal */
                 CommandTypes["GetCodeFixesFull"] = "getCodeFixes-full";
                 CommandTypes["GetCombinedCodeFix"] = "getCombinedCodeFix";
-                /* @internal */
                 CommandTypes["GetCombinedCodeFixFull"] = "getCombinedCodeFix-full";
                 CommandTypes["ApplyCodeActionCommand"] = "applyCodeActionCommand";
                 CommandTypes["GetSupportedCodeFixes"] = "getSupportedCodeFixes";
                 CommandTypes["GetApplicableRefactors"] = "getApplicableRefactors";
                 CommandTypes["GetEditsForRefactor"] = "getEditsForRefactor";
-                /* @internal */
                 CommandTypes["GetEditsForRefactorFull"] = "getEditsForRefactor-full";
                 CommandTypes["OrganizeImports"] = "organizeImports";
-                /* @internal */
                 CommandTypes["OrganizeImportsFull"] = "organizeImports-full";
                 CommandTypes["GetEditsForFileRename"] = "getEditsForFileRename";
-                /* @internal */
                 CommandTypes["GetEditsForFileRenameFull"] = "getEditsForFileRename-full";
-                // NOTE: If updating this, be sure to also update `allCommandNames` in `harness/unittests/session.ts`.
             })(CommandTypes = protocol.CommandTypes || (protocol.CommandTypes = {}));
             var IndentStyle;
             (function (IndentStyle) {
@@ -110871,8 +112207,7 @@ var ts;
 (function (ts) {
     var server;
     (function (server) {
-        /* @internal */
-        var TextStorage = /** @class */ (function () {
+        var TextStorage = (function () {
             function TextStorage(host, fileName) {
                 this.host = host;
                 this.fileName = fileName;
@@ -110902,39 +112237,20 @@ var ts;
                 this.text = undefined;
                 this.lineMap = undefined;
             };
-            /**
-             * Set the contents as newText
-             * returns true if text changed
-             */
             TextStorage.prototype.reload = function (newText) {
                 ts.Debug.assert(newText !== undefined);
-                // Reload always has fresh content
                 this.pendingReloadFromDisk = false;
-                // If text changed set the text
-                // This also ensures that if we had switched to version cache,
-                // we are switching back to text.
-                // The change to version cache will happen when needed
-                // Thus avoiding the computation if there are no changes
                 if (this.text !== newText) {
                     this.useText(newText);
-                    // We cant guarantee new text is own file text
                     this.ownFileText = false;
                     return true;
                 }
             };
-            /**
-             * Reads the contents from tempFile(if supplied) or own file and sets it as contents
-             * returns true if text changed
-             */
             TextStorage.prototype.reloadWithFileText = function (tempFileName) {
                 var reloaded = this.reload(this.getFileText(tempFileName));
                 this.ownFileText = !tempFileName || tempFileName === this.fileName;
                 return reloaded;
             };
-            /**
-             * Reloads the contents from the file if there is no pending reload from disk or the contents of file are same as file text
-             * returns true if text changed
-             */
             TextStorage.prototype.reloadFromDisk = function () {
                 if (!this.pendingReloadFromDisk && !this.ownFileText) {
                     return this.reloadWithFileText();
@@ -110952,27 +112268,19 @@ var ts;
             TextStorage.prototype.getLineInfo = function (line) {
                 return this.switchToScriptVersionCache().getLineInfo(line);
             };
-            /**
-             *  @param line 0 based index
-             */
             TextStorage.prototype.lineToTextSpan = function (line) {
                 if (!this.useScriptVersionCacheIfValidOrOpen()) {
                     var lineMap = this.getLineMap();
-                    var start = lineMap[line]; // -1 since line is 1-based
+                    var start = lineMap[line];
                     var end = line + 1 < lineMap.length ? lineMap[line + 1] : this.text.length;
                     return ts.createTextSpanFromBounds(start, end);
                 }
                 return this.svc.lineToTextSpan(line);
             };
-            /**
-             * @param line 1 based index
-             * @param offset 1 based index
-             */
             TextStorage.prototype.lineOffsetToPosition = function (line, offset) {
                 if (!this.useScriptVersionCacheIfValidOrOpen()) {
                     return ts.computePositionOfLineAndCharacter(this.getLineMap(), line - 1, offset - 1, this.text);
                 }
-                // TODO: assert this offset is actually on the line
                 return this.svc.lineOffsetToPosition(line, offset);
             };
             TextStorage.prototype.positionToLineOffset = function (position) {
@@ -110993,15 +112301,12 @@ var ts;
                 return this.svc;
             };
             TextStorage.prototype.useScriptVersionCacheIfValidOrOpen = function () {
-                // If this is open script, use the cache
                 if (this.isOpen) {
                     return this.switchToScriptVersionCache();
                 }
-                // If there is pending reload from the disk then, reload the text
                 if (this.pendingReloadFromDisk) {
                     this.reloadWithFileText();
                 }
-                // At this point if svc is present its valid
                 return this.svc;
             };
             TextStorage.prototype.getOrLoadText = function () {
@@ -111018,21 +112323,17 @@ var ts;
             return TextStorage;
         }());
         server.TextStorage = TextStorage;
-        /*@internal*/
         function isDynamicFileName(fileName) {
             return fileName[0] === "^" || ts.getBaseFileName(fileName)[0] === "^";
         }
         server.isDynamicFileName = isDynamicFileName;
-        var ScriptInfo = /** @class */ (function () {
+        var ScriptInfo = (function () {
             function ScriptInfo(host, fileName, scriptKind, hasMixedContent, path) {
                 this.host = host;
                 this.fileName = fileName;
                 this.scriptKind = scriptKind;
                 this.hasMixedContent = hasMixedContent;
                 this.path = path;
-                /**
-                 * All projects that include this file
-                 */
                 this.containingProjects = [];
                 this.isDynamic = isDynamicFileName(fileName);
                 this.textStorage = new TextStorage(host, fileName);
@@ -111044,7 +112345,6 @@ var ts;
                     ? scriptKind
                     : ts.getScriptKindFromFileName(fileName);
             }
-            /*@internal*/
             ScriptInfo.prototype.isDynamicOrHasMixedContent = function () {
                 return this.hasMixedContent || this.isDynamic;
             };
@@ -111055,7 +112355,6 @@ var ts;
                 this.textStorage.isOpen = true;
                 if (newText !== undefined &&
                     this.textStorage.reload(newText)) {
-                    // reload new contents only if the existing contents changed
                     this.markContainingProjectsAsDirty();
                 }
             };
@@ -111076,7 +112375,6 @@ var ts;
             };
             ScriptInfo.prototype.ensureRealPath = function () {
                 if (this.realpath === undefined) {
-                    // Default is just the path
                     this.realpath = this.path;
                     if (this.host.realpath) {
                         ts.Debug.assert(!!this.containingProjects.length);
@@ -111084,15 +112382,13 @@ var ts;
                         var realpath = this.host.realpath(this.path);
                         if (realpath) {
                             this.realpath = project.toPath(realpath);
-                            // If it is different from this.path, add to the map
                             if (this.realpath !== this.path) {
-                                project.projectService.realpathToScriptInfos.add(this.realpath, this); // TODO: GH#18217
+                                project.projectService.realpathToScriptInfos.add(this.realpath, this);
                             }
                         }
                     }
                 }
             };
-            /*@internal*/
             ScriptInfo.prototype.getRealpathIfDifferent = function () {
                 return this.realpath && this.realpath !== this.path ? this.realpath : undefined;
             };
@@ -111110,7 +112406,6 @@ var ts;
                 return isNew;
             };
             ScriptInfo.prototype.isAttached = function (project) {
-                // unrolled for common cases
                 switch (this.containingProjects.length) {
                     case 0: return false;
                     case 1: return this.containingProjects[0] === project;
@@ -111119,7 +112414,6 @@ var ts;
                 }
             };
             ScriptInfo.prototype.detachFromProject = function (project) {
-                // unrolled for common cases
                 switch (this.containingProjects.length) {
                     case 0:
                         return;
@@ -111153,10 +112447,7 @@ var ts;
                         p.getCachedDirectoryStructureHost().addOrDeleteFile(this.fileName, this.path, ts.FileWatcherEventKind.Deleted);
                     }
                     var isInfoRoot = p.isRoot(this);
-                    // detach is unnecessary since we'll clean the list of containing projects anyways
-                    p.removeFile(this, /*fileExists*/ false, /*detachFromProjects*/ false);
-                    // If the info was for the external or configured project's root,
-                    // add missing file as the root
+                    p.removeFile(this, false, false);
                     if (isInfoRoot && p.projectKind !== server.ProjectKind.Inferred) {
                         p.addMissingFileRoot(this.fileName);
                     }
@@ -111170,9 +112461,6 @@ var ts;
                     case 1:
                         return this.containingProjects[0];
                     default:
-                        // if this file belongs to multiple projects, the first configured project should be
-                        // the default project; if no configured projects, the first external project should
-                        // be the default project; otherwise the first inferred project should be the default.
                         var firstExternalProject = void 0;
                         for (var _i = 0, _a = this.containingProjects; _i < _a.length; _i++) {
                             var project = _a[_i];
@@ -111215,7 +112503,6 @@ var ts;
             ScriptInfo.prototype.saveTo = function (fileName) {
                 this.host.writeFile(fileName, ts.getSnapshotText(this.textStorage.getSnapshot()));
             };
-            /*@internal*/
             ScriptInfo.prototype.delayReloadNonMixedContentFile = function () {
                 ts.Debug.assert(!this.isDynamicOrHasMixedContent());
                 this.textStorage.delayReloadFromFileIntoText();
@@ -111232,7 +112519,6 @@ var ts;
                     }
                 }
             };
-            /*@internal*/
             ScriptInfo.prototype.getLineInfo = function (line) {
                 return this.textStorage.getLineInfo(line);
             };
@@ -111249,16 +112535,9 @@ var ts;
             ScriptInfo.prototype.isOrphan = function () {
                 return !ts.forEach(this.containingProjects, function (p) { return !p.isOrphan(); });
             };
-            /**
-             *  @param line 1 based index
-             */
             ScriptInfo.prototype.lineToTextSpan = function (line) {
                 return this.textStorage.lineToTextSpan(line);
             };
-            /**
-             * @param line 1 based index
-             * @param offset 1 based index
-             */
             ScriptInfo.prototype.lineOffsetToPosition = function (line, offset) {
                 return this.textStorage.lineOffsetToPosition(line, offset);
             };
@@ -111266,7 +112545,7 @@ var ts;
                 return this.textStorage.positionToLineOffset(position);
             };
             ScriptInfo.prototype.isJavaScript = function () {
-                return this.scriptKind === 1 /* JS */ || this.scriptKind === 2 /* JSX */;
+                return this.scriptKind === 1 || this.scriptKind === 2;
             };
             return ScriptInfo;
         }());
@@ -111279,12 +112558,11 @@ var ts;
     (function (server) {
         server.nullTypingsInstaller = {
             isKnownTypesPackageName: ts.returnFalse,
-            // Should never be called because we never provide a types registry.
             installPackage: ts.notImplemented,
             enqueueInstallTypingsRequest: ts.noop,
             attach: ts.noop,
             onProjectClosed: ts.noop,
-            globalTypingsCacheLocation: undefined // TODO: GH#18217
+            globalTypingsCacheLocation: undefined
         };
         function setIsEqualTo(arr1, arr2) {
             if (arr1 === arr2) {
@@ -111321,7 +112599,6 @@ var ts;
                 !setIsEqualTo(opt1.exclude, opt2.exclude);
         }
         function compilerOptionsChanged(opt1, opt2) {
-            // TODO: add more relevant properties
             return opt1.allowJs !== opt2.allowJs;
         }
         function unresolvedImportsChanged(imports1, imports2) {
@@ -111330,8 +112607,7 @@ var ts;
             }
             return !ts.arrayIsEqualTo(imports1, imports2);
         }
-        /*@internal*/
-        var TypingsCache = /** @class */ (function () {
+        var TypingsCache = (function () {
             function TypingsCache(installer) {
                 this.installer = installer;
                 this.perProjectCache = ts.createMap();
@@ -111353,8 +112629,6 @@ var ts;
                     typeAcquisitionChanged(typeAcquisition, entry.typeAcquisition) ||
                     compilerOptionsChanged(project.getCompilationSettings(), entry.compilerOptions) ||
                     unresolvedImportsChanged(unresolvedImports, entry.unresolvedImports)) {
-                    // Note: entry is now poisoned since it does not really contain typings for a given combination of compiler options\typings options.
-                    // instead it acts as a placeholder to prevent issuing multiple requests
                     this.perProjectCache.set(project.getProjectName(), {
                         compilerOptions: project.getCompilationSettings(),
                         typeAcquisition: typeAcquisition,
@@ -111362,7 +112636,6 @@ var ts;
                         unresolvedImports: unresolvedImports,
                         poisoned: true
                     });
-                    // something has been changed, issue a request to update typings
                     this.installer.enqueueInstallTypingsRequest(project, typeAcquisition, unresolvedImports);
                 }
             };
@@ -111396,27 +112669,26 @@ var ts;
             ProjectKind[ProjectKind["Configured"] = 1] = "Configured";
             ProjectKind[ProjectKind["External"] = 2] = "External";
         })(ProjectKind = server.ProjectKind || (server.ProjectKind = {}));
-        /* @internal */
         function countEachFileTypes(infos) {
             var result = { js: 0, jsx: 0, ts: 0, tsx: 0, dts: 0, deferred: 0 };
             for (var _i = 0, infos_1 = infos; _i < infos_1.length; _i++) {
                 var info = infos_1[_i];
                 switch (info.scriptKind) {
-                    case 1 /* JS */:
+                    case 1:
                         result.js += 1;
                         break;
-                    case 2 /* JSX */:
+                    case 2:
                         result.jsx += 1;
                         break;
-                    case 3 /* TS */:
-                        ts.fileExtensionIs(info.fileName, ".d.ts" /* Dts */)
+                    case 3:
+                        ts.fileExtensionIs(info.fileName, ".d.ts")
                             ? result.dts += 1
                             : result.ts += 1;
                         break;
-                    case 4 /* TSX */:
+                    case 4:
                         result.tsx += 1;
                         break;
-                    case 7 /* Deferred */:
+                    case 7:
                         result.deferred += 1;
                         break;
                 }
@@ -111438,20 +112710,16 @@ var ts;
             return counts.ts === 0 && counts.tsx === 0;
         }
         server.allFilesAreJsOrDts = allFilesAreJsOrDts;
-        /* @internal */
         function hasNoTypeScriptSource(fileNames) {
-            return !fileNames.some(function (fileName) { return (ts.fileExtensionIs(fileName, ".ts" /* Ts */) && !ts.fileExtensionIs(fileName, ".d.ts" /* Dts */)) || ts.fileExtensionIs(fileName, ".tsx" /* Tsx */); });
+            return !fileNames.some(function (fileName) { return (ts.fileExtensionIs(fileName, ".ts") && !ts.fileExtensionIs(fileName, ".d.ts")) || ts.fileExtensionIs(fileName, ".tsx"); });
         }
         server.hasNoTypeScriptSource = hasNoTypeScriptSource;
-        /* @internal */
         function isScriptInfo(value) {
             return value instanceof server.ScriptInfo;
         }
         server.isScriptInfo = isScriptInfo;
-        var Project = /** @class */ (function () {
-            /*@internal*/
-            function Project(
-            /*@internal*/ projectName, projectKind, projectService, documentRegistry, hasExplicitListOfFiles, lastFileExceededProgramSize, compilerOptions, compileOnSaveEnabled, directoryStructureHost, currentDirectory) {
+        var Project = (function () {
+            function Project(projectName, projectKind, projectService, documentRegistry, hasExplicitListOfFiles, lastFileExceededProgramSize, compilerOptions, compileOnSaveEnabled, directoryStructureHost, currentDirectory) {
                 var _this = this;
                 this.projectName = projectName;
                 this.projectKind = projectKind;
@@ -111462,36 +112730,13 @@ var ts;
                 this.rootFiles = [];
                 this.rootFilesMap = ts.createMap();
                 this.plugins = [];
-                /*@internal*/
-                /**
-                 * This is map from files to unresolved imports in it
-                 * Maop does not contain entries for files that do not have unresolved imports
-                 * This helps in containing the set of files to invalidate
-                 */
                 this.cachedUnresolvedImportsPerFile = ts.createMap();
-                /*@internal*/
                 this.hasAddedorRemovedFiles = false;
-                /**
-                 * Last version that was reported.
-                 */
                 this.lastReportedVersion = 0;
-                /**
-                 * Current project's program version. (incremented everytime new program is created that is not complete reuse from the old one)
-                 * This property is changed in 'updateGraph' based on the set of files in program
-                 */
                 this.projectProgramVersion = 0;
-                /**
-                 * Current version of the project state. It is changed when:
-                 * - new root file was added/removed
-                 * - edit happen in some file that is currently included in the project.
-                 * This property is different from projectStructureVersion since in most cases edits don't affect set of files in the project
-                 */
                 this.projectStateVersion = 0;
-                /*@internal*/
                 this.dirty = false;
-                /*@internal*/
                 this.hasChangedAutomaticTypeDirectiveNames = false;
-                /*@internal*/
                 this.typingFiles = server.emptyArray;
                 this.directoryStructureHost = directoryStructureHost;
                 this.currentDirectory = this.projectService.getNormalizedAbsolutePath(currentDirectory || "");
@@ -111503,7 +112748,6 @@ var ts;
                     this.compilerOptions.allowJs = true;
                 }
                 else if (hasExplicitListOfFiles || this.compilerOptions.allowJs || this.projectService.hasDeferredExtension()) {
-                    // If files are listed explicitly or allowJs is specified, allow all extensions
                     this.compilerOptions.allowNonTsExtensions = true;
                 }
                 this.languageServiceEnabled = !projectService.syntaxOnly;
@@ -111518,8 +112762,7 @@ var ts;
                 if (host.realpath) {
                     this.realpath = function (path) { return host.realpath(path); };
                 }
-                // Use the current directory as resolution root only if the project created using current directory string
-                this.resolutionCache = ts.createResolutionCache(this, currentDirectory && this.currentDirectory, /*logChangesWhenResolvingModule*/ true);
+                this.resolutionCache = ts.createResolutionCache(this, currentDirectory && this.currentDirectory, true);
                 this.languageService = ts.createLanguageService(this, this.documentRegistry, projectService.syntaxOnly);
                 if (lastFileExceededProgramSize) {
                     this.disableLanguageService(lastFileExceededProgramSize);
@@ -111538,7 +112781,7 @@ var ts;
             Project.resolveModule = function (moduleName, initialDir, host, log) {
                 var resolvedPath = ts.normalizeSlashes(host.resolvePath(ts.combinePaths(initialDir, "node_modules")));
                 log("Loading " + moduleName + " from " + initialDir + " (resolved to " + resolvedPath + ")");
-                var result = host.require(resolvedPath, moduleName); // TODO: GH#18217
+                var result = host.require(resolvedPath, moduleName);
                 if (result.error) {
                     var err = result.error.stack || result.error.message || JSON.stringify(result.error);
                     log("Failed to load module '" + moduleName + "': " + err);
@@ -111559,11 +112802,9 @@ var ts;
                 enumerable: true,
                 configurable: true
             });
-            // Method of LanguageServiceHost
             Project.prototype.getCompilationSettings = function () {
                 return this.compilerOptions;
             };
-            // Method to support public API
             Project.prototype.getCompilerOptions = function () {
                 return this.getCompilationSettings();
             };
@@ -111584,7 +112825,6 @@ var ts;
                 var result;
                 this.rootFilesMap.forEach(function (value) {
                     if (_this.languageServiceEnabled || (isScriptInfo(value) && value.isScriptOpen())) {
-                        // if language service is disabled - process only files that are open
                         (result || (result = [])).push(isScriptInfo(value) ? value.fileName : value);
                     }
                 });
@@ -111595,7 +112835,6 @@ var ts;
                 if (scriptInfo) {
                     var existingValue = this.rootFilesMap.get(scriptInfo.path);
                     if (existingValue !== scriptInfo && existingValue !== undefined) {
-                        // This was missing path earlier but now the file exists. Update the root
                         this.rootFiles.push(scriptInfo);
                         this.rootFilesMap.set(scriptInfo.path, scriptInfo);
                     }
@@ -111605,11 +112844,11 @@ var ts;
             };
             Project.prototype.getScriptKind = function (fileName) {
                 var info = this.getOrCreateScriptInfoAndAttachToProject(fileName);
-                return (info && info.scriptKind); // TODO: GH#18217
+                return (info && info.scriptKind);
             };
             Project.prototype.getScriptVersion = function (filename) {
                 var info = this.getOrCreateScriptInfoAndAttachToProject(filename);
-                return (info && info.getLatestVersion()); // TODO: GH#18217
+                return (info && info.getLatestVersion());
             };
             Project.prototype.getScriptSnapshot = function (filename) {
                 var scriptInfo = this.getOrCreateScriptInfoAndAttachToProject(filename);
@@ -111637,8 +112876,6 @@ var ts;
                 return this.projectService.host.readFile(fileName);
             };
             Project.prototype.fileExists = function (file) {
-                // As an optimization, don't hit the disks for files we already know don't exist
-                // (because we're watching for their creation).
                 var path = this.toPath(file);
                 return !this.isWatchedMissingFile(path) && this.directoryStructureHost.fileExists(file);
             };
@@ -111652,41 +112889,33 @@ var ts;
                 return this.resolutionCache.resolveTypeReferenceDirectives(typeDirectiveNames, containingFile);
             };
             Project.prototype.directoryExists = function (path) {
-                return this.directoryStructureHost.directoryExists(path); // TODO: GH#18217
+                return this.directoryStructureHost.directoryExists(path);
             };
             Project.prototype.getDirectories = function (path) {
-                return this.directoryStructureHost.getDirectories(path); // TODO: GH#18217
+                return this.directoryStructureHost.getDirectories(path);
             };
-            /*@internal*/
             Project.prototype.getCachedDirectoryStructureHost = function () {
-                return undefined; // TODO: GH#18217
+                return undefined;
             };
-            /*@internal*/
             Project.prototype.toPath = function (fileName) {
                 return ts.toPath(fileName, this.currentDirectory, this.projectService.toCanonicalFileName);
             };
-            /*@internal*/
             Project.prototype.watchDirectoryOfFailedLookupLocation = function (directory, cb, flags) {
-                return this.projectService.watchFactory.watchDirectory(this.projectService.host, directory, cb, flags, "Directory of Failed lookup locations in module resolution" /* FailedLookupLocation */, this);
+                return this.projectService.watchFactory.watchDirectory(this.projectService.host, directory, cb, flags, "Directory of Failed lookup locations in module resolution", this);
             };
-            /*@internal*/
             Project.prototype.onInvalidatedResolution = function () {
                 this.projectService.delayUpdateProjectGraphAndEnsureProjectStructureForOpenFiles(this);
             };
-            /*@internal*/
             Project.prototype.watchTypeRootsDirectory = function (directory, cb, flags) {
-                return this.projectService.watchFactory.watchDirectory(this.projectService.host, directory, cb, flags, "Type root directory" /* TypeRoots */, this);
+                return this.projectService.watchFactory.watchDirectory(this.projectService.host, directory, cb, flags, "Type root directory", this);
             };
-            /*@internal*/
             Project.prototype.onChangedAutomaticTypeDirectiveNames = function () {
                 this.hasChangedAutomaticTypeDirectiveNames = true;
                 this.projectService.delayUpdateProjectGraphAndEnsureProjectStructureForOpenFiles(this);
             };
-            /*@internal*/
             Project.prototype.getGlobalCache = function () {
                 return this.getTypeAcquisition().enable ? this.projectService.typingsInstaller.globalTypingsCacheLocation : undefined;
             };
-            /*@internal*/
             Project.prototype.writeLog = function (s) {
                 this.projectService.logger.info(s);
             };
@@ -111701,9 +112930,6 @@ var ts;
                     this.compilerOptions.noEmitForJsFiles = true;
                 }
             };
-            /**
-             * Get the errors that dont have any file name associated
-             */
             Project.prototype.getGlobalProjectErrors = function () {
                 return server.emptyArray;
             };
@@ -111727,18 +112953,13 @@ var ts;
                 }
                 this.updateGraph();
                 this.builderState = ts.BuilderState.create(this.program, this.projectService.toCanonicalFileName, this.builderState);
-                return ts.mapDefined(ts.BuilderState.getFilesAffectedBy(this.builderState, this.program, scriptInfo.path, this.cancellationToken, function (data) { return _this.projectService.host.createHash(data); }), // TODO: GH#18217
-                function (// TODO: GH#18217
-                sourceFile) { return _this.shouldEmitFile(_this.projectService.getScriptInfoForPath(sourceFile.path)) ? sourceFile.fileName : undefined; });
+                return ts.mapDefined(ts.BuilderState.getFilesAffectedBy(this.builderState, this.program, scriptInfo.path, this.cancellationToken, function (data) { return _this.projectService.host.createHash(data); }), function (sourceFile) { return _this.shouldEmitFile(_this.projectService.getScriptInfoForPath(sourceFile.path)) ? sourceFile.fileName : undefined; });
             };
-            /**
-             * Returns true if emit was conducted
-             */
             Project.prototype.emitFile = function (scriptInfo, writeFile) {
                 if (!this.languageServiceEnabled || !this.shouldEmitFile(scriptInfo)) {
                     return false;
                 }
-                var _a = this.getLanguageService(/*ensureSynchronized*/ false).getEmitOutput(scriptInfo.fileName), emitSkipped = _a.emitSkipped, outputFiles = _a.outputFiles;
+                var _a = this.getLanguageService(false).getEmitOutput(scriptInfo.fileName), emitSkipped = _a.emitSkipped, outputFiles = _a.outputFiles;
                 if (!emitSkipped) {
                     for (var _i = 0, outputFiles_1 = outputFiles; _i < outputFiles_1.length; _i++) {
                         var outputFile = outputFiles_1[_i];
@@ -111754,7 +112975,7 @@ var ts;
                 }
                 this.languageServiceEnabled = true;
                 this.lastFileExceededProgramSize = undefined;
-                this.projectService.onUpdateLanguageServiceStateForProject(this, /*languageServiceEnabled*/ true);
+                this.projectService.onUpdateLanguageServiceStateForProject(this, true);
             };
             Project.prototype.disableLanguageService = function (lastFileExceededProgramSize) {
                 if (!this.languageServiceEnabled) {
@@ -111766,14 +112987,13 @@ var ts;
                 this.lastFileExceededProgramSize = lastFileExceededProgramSize;
                 this.builderState = undefined;
                 this.resolutionCache.closeTypeRootsWatch();
-                this.projectService.onUpdateLanguageServiceStateForProject(this, /*languageServiceEnabled*/ false);
+                this.projectService.onUpdateLanguageServiceStateForProject(this, false);
             };
             Project.prototype.getProjectName = function () {
                 return this.projectName;
             };
             Project.prototype.removeLocalTypingsFromTypeAcquisition = function (newTypeAcquisition) {
                 if (!newTypeAcquisition || !newTypeAcquisition.include) {
-                    // Nothing to filter out, so just return as-is
                     return newTypeAcquisition;
                 }
                 return __assign({}, newTypeAcquisition, { include: this.removeExistingTypings(newTypeAcquisition.include) });
@@ -111800,20 +113020,19 @@ var ts;
                 }
                 return this.program.getSourceFileByPath(path);
             };
+            Project.prototype.getSourceFileOrConfigFile = function (path) {
+                var options = this.program.getCompilerOptions();
+                return path === options.configFilePath ? options.configFile : this.getSourceFile(path);
+            };
             Project.prototype.close = function () {
                 var _this = this;
                 if (this.program) {
-                    // if we have a program - release all files that are enlisted in program but arent root
-                    // The releasing of the roots happens later
-                    // The project could have pending update remaining and hence the info could be in the files but not in program graph
                     for (var _i = 0, _a = this.program.getSourceFiles(); _i < _a.length; _i++) {
                         var f = _a[_i];
                         this.detachScriptInfoIfNotRoot(f.fileName);
                     }
                 }
-                // Release external files
                 ts.forEach(this.externalFiles, function (externalFile) { return _this.detachScriptInfoIfNotRoot(externalFile); });
-                // Always remove root files from the project
                 for (var _b = 0, _c = this.rootFiles; _b < _c.length; _b++) {
                     var root = _c[_b];
                     root.detachFromProject(this);
@@ -111828,19 +113047,15 @@ var ts;
                 this.resolutionCache = undefined;
                 this.cachedUnresolvedImportsPerFile = undefined;
                 this.directoryStructureHost = undefined;
-                // Clean up file watchers waiting for missing files
                 if (this.missingFilesMap) {
                     ts.clearMap(this.missingFilesMap, ts.closeFileWatcher);
                     this.missingFilesMap = undefined;
                 }
-                // signal language service to release source files acquired from document registry
                 this.languageService.dispose();
                 this.languageService = undefined;
             };
             Project.prototype.detachScriptInfoIfNotRoot = function (uncheckedFilename) {
                 var info = this.projectService.getScriptInfo(uncheckedFilename);
-                // We might not find the script info in case its not associated with the project any more
-                // and project graph was not updated (eg delayed update graph in case of files changed/deleted on the disk)
                 if (info && !this.isRoot(info)) {
                     info.detachFromProject(this);
                 }
@@ -111851,14 +113066,12 @@ var ts;
             Project.prototype.hasRoots = function () {
                 return this.rootFiles && this.rootFiles.length > 0;
             };
-            /*@internal*/
             Project.prototype.isOrphan = function () {
                 return false;
             };
             Project.prototype.getRootFiles = function () {
                 return this.rootFiles && this.rootFiles.map(function (info) { return info.fileName; });
             };
-            /*@internal*/
             Project.prototype.getRootFilesMap = function () {
                 return this.rootFilesMap;
             };
@@ -111868,12 +113081,11 @@ var ts;
             Project.prototype.getScriptInfos = function () {
                 var _this = this;
                 if (!this.languageServiceEnabled) {
-                    // if language service is not enabled - return just root files
                     return this.rootFiles;
                 }
                 return ts.map(this.program.getSourceFiles(), function (sourceFile) {
-                    var scriptInfo = _this.projectService.getScriptInfoForPath(sourceFile.path);
-                    ts.Debug.assert(!!scriptInfo, "getScriptInfo", function () { return "scriptInfo for a file '" + sourceFile.fileName + "' Path: '" + sourceFile.path + "' is missing."; });
+                    var scriptInfo = _this.projectService.getScriptInfoForPath(sourceFile.resolvedPath || sourceFile.path);
+                    ts.Debug.assert(!!scriptInfo, "getScriptInfo", function () { return "scriptInfo for a file '" + sourceFile.fileName + "' Path: '" + sourceFile.path + "' / '" + sourceFile.resolvedPath + "' is missing."; });
                     return scriptInfo;
                 });
             };
@@ -111885,7 +113097,6 @@ var ts;
                     return [];
                 }
                 if (!this.languageServiceEnabled) {
-                    // if language service is disabled assume that all files in program are root files + default library
                     var rootFiles = this.getRootFiles();
                     if (this.compilerOptions) {
                         var defaultLibrary = ts.getDefaultLibFilePath(this.compilerOptions);
@@ -111949,7 +113160,6 @@ var ts;
             Project.prototype.isRoot = function (info) {
                 return this.rootFilesMap && this.rootFilesMap.get(info.path) === info;
             };
-            // add a root file to project
             Project.prototype.addRoot = function (info) {
                 ts.Debug.assert(!this.isRoot(info));
                 this.rootFiles.push(info);
@@ -111957,7 +113167,6 @@ var ts;
                 info.attachToProject(this);
                 this.markAsDirty();
             };
-            // add a root file that doesnt exist on host
             Project.prototype.addMissingFileRoot = function (fileName) {
                 var path = this.projectService.toPath(fileName);
                 this.rootFilesMap.set(path, fileName);
@@ -111968,7 +113177,6 @@ var ts;
                     this.removeRoot(info);
                 }
                 if (fileExists) {
-                    // If file is present, just remove the resolutions for the file
                     this.resolutionCache.removeResolutionsOfFile(info.path);
                 }
                 else {
@@ -111989,23 +113197,18 @@ var ts;
                     this.dirty = true;
                 }
             };
-            /* @internal */
             Project.prototype.extractUnresolvedImportsFromSourceFile = function (file, ambientModules) {
                 var cached = this.cachedUnresolvedImportsPerFile.get(file.path);
                 if (cached) {
-                    // found cached result, return
                     return cached;
                 }
                 var unresolvedImports;
                 if (file.resolvedModules) {
                     file.resolvedModules.forEach(function (resolvedModule, name) {
-                        // pick unresolved non-relative names
                         if (!resolvedModule && !ts.isExternalModuleNameRelative(name) && !isAmbientlyDeclaredModule(name)) {
-                            // for non-scoped names extract part up-to the first slash
-                            // for scoped names - extract up to the second slash
                             var trimmed = name.trim();
                             var i = trimmed.indexOf("/");
-                            if (i !== -1 && trimmed.charCodeAt(0) === 64 /* at */) {
+                            if (i !== -1 && trimmed.charCodeAt(0) === 64) {
                                 i = trimmed.indexOf("/", i + 1);
                             }
                             if (i !== -1) {
@@ -112021,14 +113224,9 @@ var ts;
                     return ambientModules.some(function (m) { return m === name; });
                 }
             };
-            /* @internal */
             Project.prototype.onFileAddedOrRemoved = function () {
                 this.hasAddedorRemovedFiles = true;
             };
-            /**
-             * Updates set of files that contribute to this project
-             * @returns: true if set of files in the project stays the same and false - otherwise.
-             */
             Project.prototype.updateGraph = function () {
                 var _a;
                 this.resolutionCache.startRecordingFilesWithChangedResolutions();
@@ -112037,19 +113235,10 @@ var ts;
                 this.hasAddedorRemovedFiles = false;
                 var changedFiles = this.resolutionCache.finishRecordingFilesWithChangedResolutions() || server.emptyArray;
                 for (var _i = 0, changedFiles_1 = changedFiles; _i < changedFiles_1.length; _i++) {
-                    var file_19 = changedFiles_1[_i];
-                    // delete cached information for changed files
-                    this.cachedUnresolvedImportsPerFile.delete(file_19);
+                    var file = changedFiles_1[_i];
+                    this.cachedUnresolvedImportsPerFile.delete(file);
                 }
-                // update builder only if language service is enabled
-                // otherwise tell it to drop its internal state
                 if (this.languageServiceEnabled) {
-                    // 1. no changes in structure, no changes in unresolved imports - do nothing
-                    // 2. no changes in structure, unresolved imports were changed - collect unresolved imports for all files
-                    // (can reuse cached imports for files that were not changed)
-                    // 3. new files were added/removed, but compilation settings stays the same - collect unresolved imports for all new/modified files
-                    // (can reuse cached imports for files that were not changed)
-                    // 4. compilation settings were changed in the way that might affect module resolution - drop all caches and collect all data from the scratch
                     if (hasNewProgram || changedFiles.length) {
                         var result = void 0;
                         var ambientModules = this.program.getTypeChecker().getAmbientModules().map(function (mod) { return ts.stripQuotes(mod.getName()); });
@@ -112072,16 +113261,12 @@ var ts;
                 }
                 return !hasNewProgram;
             };
-            /*@internal*/
             Project.prototype.updateTypingFiles = function (typingFiles) {
                 var _this = this;
-                ts.enumerateInsertsAndDeletes(typingFiles, this.typingFiles, ts.getStringComparer(!this.useCaseSensitiveFileNames()), 
-                /*inserted*/ ts.noop, function (removed) { return _this.detachScriptInfoFromProject(removed); });
+                ts.enumerateInsertsAndDeletes(typingFiles, this.typingFiles, ts.getStringComparer(!this.useCaseSensitiveFileNames()), ts.noop, function (removed) { return _this.detachScriptInfoFromProject(removed); });
                 this.typingFiles = typingFiles;
-                // Invalidate files with unresolved imports
                 this.resolutionCache.setFilesWithInvalidatedNonRelativeUnresolvedImports(this.cachedUnresolvedImportsPerFile);
             };
-            /* @internal */
             Project.prototype.getCurrentProgram = function () {
                 return this.program;
             };
@@ -112097,14 +113282,11 @@ var ts;
                 var start = ts.timestamp();
                 this.hasInvalidatedResolution = this.resolutionCache.createHasInvalidatedResolution();
                 this.resolutionCache.startCachingPerDirectoryResolution();
-                this.program = this.languageService.getProgram(); // TODO: GH#18217
+                this.program = this.languageService.getProgram();
                 this.dirty = false;
                 this.resolutionCache.finishCachingPerDirectoryResolution();
                 ts.Debug.assert(oldProgram === undefined || this.program !== undefined);
-                // bump up the version if
-                // - oldProgram is not set - this is a first time updateGraph is called
-                // - newProgram is different from the old program and structure of the old program was not reused.
-                var hasNewProgram = this.program && (!oldProgram || (this.program !== oldProgram && !(oldProgram.structureIsReused & 2 /* Completely */)));
+                var hasNewProgram = this.program && (!oldProgram || (this.program !== oldProgram && !(oldProgram.structureIsReused & 2)));
                 this.hasChangedAutomaticTypeDirectiveNames = false;
                 if (hasNewProgram) {
                     if (oldProgram) {
@@ -112113,26 +113295,17 @@ var ts;
                             if (this.program.getSourceFileByPath(f.path)) {
                                 continue;
                             }
-                            // new program does not contain this file - detach it from the project
                             this.detachScriptInfoFromProject(f.fileName);
                         }
                     }
-                    // Update the missing file paths watcher
-                    ts.updateMissingFilePathsWatch(this.program, this.missingFilesMap || (this.missingFilesMap = ts.createMap()), 
-                    // Watch the missing files
-                    function (missingFilePath) { return _this.addMissingFileWatcher(missingFilePath); });
-                    // Watch the type locations that would be added to program as part of automatic type resolutions
+                    ts.updateMissingFilePathsWatch(this.program, this.missingFilesMap || (this.missingFilesMap = ts.createMap()), function (missingFilePath) { return _this.addMissingFileWatcher(missingFilePath); });
                     if (this.languageServiceEnabled) {
                         this.resolutionCache.updateTypeRootsWatch();
                     }
                 }
                 var oldExternalFiles = this.externalFiles || server.emptyArray;
                 this.externalFiles = this.getExternalFiles();
-                ts.enumerateInsertsAndDeletes(this.externalFiles, oldExternalFiles, ts.getStringComparer(!this.useCaseSensitiveFileNames()), 
-                // Ensure a ScriptInfo is created for new external files. This is performed indirectly
-                // by the LSHost for files in the program when the program is retrieved above but
-                // the program doesn't contain external files so this must be done explicitly.
-                function (inserted) {
+                ts.enumerateInsertsAndDeletes(this.externalFiles, oldExternalFiles, ts.getStringComparer(!this.useCaseSensitiveFileNames()), function (inserted) {
                     var scriptInfo = _this.projectService.getOrCreateScriptInfoNotOpenedByClient(inserted, _this.currentDirectory, _this.directoryStructureHost);
                     scriptInfo.attachToProject(_this);
                 }, function (removed) { return _this.detachScriptInfoFromProject(removed); });
@@ -112156,10 +113329,9 @@ var ts;
                     if (eventKind === ts.FileWatcherEventKind.Created && _this.missingFilesMap.has(missingFilePath)) {
                         _this.missingFilesMap.delete(missingFilePath);
                         fileWatcher.close();
-                        // When a missing file is created, we should update the graph.
                         _this.projectService.delayUpdateProjectGraphAndEnsureProjectStructureForOpenFiles(_this);
                     }
-                }, ts.PollingInterval.Medium, "Missing file from program" /* MissingFilePath */, this);
+                }, ts.PollingInterval.Medium, "Missing file from program", this);
                 return fileWatcher;
             };
             Project.prototype.isWatchedMissingFile = function (path) {
@@ -112182,9 +113354,9 @@ var ts;
                 var sourceFiles = this.program.getSourceFiles();
                 var strBuilder = "\tFiles (" + sourceFiles.length + ")\n";
                 if (writeProjectFileNames) {
-                    for (var _i = 0, sourceFiles_8 = sourceFiles; _i < sourceFiles_8.length; _i++) {
-                        var file_20 = sourceFiles_8[_i];
-                        strBuilder += "\t" + file_20.fileName + "\n";
+                    for (var _i = 0, sourceFiles_1 = sourceFiles; _i < sourceFiles_1.length; _i++) {
+                        var file = sourceFiles_1[_i];
+                        strBuilder += "\t" + file.fileName + "\n";
                     }
                 }
                 return strBuilder;
@@ -112196,7 +113368,6 @@ var ts;
                     this.compilerOptions = compilerOptions;
                     this.setInternalCompilerOptionsForEmittingJsFiles();
                     if (ts.changesAffectModuleResolution(oldOptions, compilerOptions)) {
-                        // reset cached unresolved imports if changes in compiler options affected module resolution
                         this.cachedUnresolvedImportsPerFile.clear();
                         this.lastCachedUnresolvedImportsList = undefined;
                         this.resolutionCache.clear();
@@ -112204,7 +113375,6 @@ var ts;
                     this.markAsDirty();
                 }
             };
-            /* @internal */
             Project.prototype.getChangesSinceVersion = function (lastKnownVersion) {
                 this.updateGraph();
                 var info = {
@@ -112217,13 +113387,10 @@ var ts;
                 };
                 var updatedFileNames = this.updatedFileNames;
                 this.updatedFileNames = undefined;
-                // check if requested version is the same that we have reported last time
                 if (this.lastReportedFileNames && lastKnownVersion === this.lastReportedVersion) {
-                    // if current structure version is the same - return info without any changes
                     if (this.projectProgramVersion === this.lastReportedVersion && !updatedFileNames) {
                         return { info: info, projectErrors: this.getGlobalProjectErrors() };
                     }
-                    // compute and return the difference
                     var lastReportedFileNames_1 = this.lastReportedFileNames;
                     var externalFiles = this.getExternalFiles().map(function (f) { return server.toNormalizedPath(f); });
                     var currentFiles_1 = ts.arrayToSet(this.getFileNames().concat(externalFiles));
@@ -112245,7 +113412,6 @@ var ts;
                     return { info: info, changes: { added: added_1, removed: removed_1, updated: updated }, projectErrors: this.getGlobalProjectErrors() };
                 }
                 else {
-                    // unknown version - return everything
                     var projectFileNames = this.getFileNames();
                     var externalFiles = this.getExternalFiles().map(function (f) { return server.toNormalizedPath(f); });
                     var allFiles = projectFileNames.concat(externalFiles);
@@ -112254,7 +113420,6 @@ var ts;
                     return { info: info, files: allFiles, projectErrors: this.getGlobalProjectErrors() };
                 }
             };
-            // remove a root file from project
             Project.prototype.removeRoot = function (info) {
                 ts.orderedRemoveItem(this.rootFiles, info);
                 this.rootFilesMap.delete(info.path);
@@ -112266,26 +113431,20 @@ var ts;
                     this.projectService.logger.info("Plugins were requested but not running in environment that supports 'require'. Nothing will be loaded");
                     return;
                 }
-                // Search our peer node_modules, then any globally-specified probe paths
-                // ../../.. to walk from X/node_modules/typescript/lib/tsserver.js to X/node_modules/
                 var searchPaths = [ts.combinePaths(this.projectService.getExecutingFilePath(), "../../..")].concat(this.projectService.pluginProbeLocations);
                 if (this.projectService.globalPlugins) {
-                    var _loop_26 = function (globalPluginName) {
-                        // Skip empty names from odd commandline parses
+                    var _loop_1 = function (globalPluginName) {
                         if (!globalPluginName)
                             return "continue";
-                        // Skip already-locally-loaded plugins
                         if (options.plugins && options.plugins.some(function (p) { return p.name === globalPluginName; }))
                             return "continue";
-                        // Provide global: true so plugins can detect why they can't find their config
                         this_1.projectService.logger.info("Loading global plugin " + globalPluginName);
                         this_1.enablePlugin({ name: globalPluginName, global: true }, searchPaths);
                     };
                     var this_1 = this;
-                    // Enable global plugins with synthetic configuration entries
                     for (var _i = 0, _a = this.projectService.globalPlugins; _i < _a.length; _i++) {
                         var globalPluginName = _a[_i];
-                        _loop_26(globalPluginName);
+                        _loop_1(globalPluginName);
                     }
                 }
             };
@@ -112305,7 +113464,6 @@ var ts;
                     this.projectService.logger.info("Couldn't find " + pluginConfigEntry.name);
                 }
             };
-            /** Starts a new check for diagnostics. Call this if some file has updated that would cause diagnostics to be changed. */
             Project.prototype.refreshDiagnostics = function () {
                 this.projectService.sendProjectsUpdatedInBackgroundEvent();
             };
@@ -112342,19 +113500,10 @@ var ts;
             return Project;
         }());
         server.Project = Project;
-        /**
-         * If a file is opened and no tsconfig (or jsconfig) is found,
-         * the file and its imports/references are put into an InferredProject.
-         */
-        var InferredProject = /** @class */ (function (_super) {
+        var InferredProject = (function (_super) {
             __extends(InferredProject, _super);
-            /*@internal*/
             function InferredProject(projectService, documentRegistry, compilerOptions, projectRootPath, currentDirectory) {
-                var _this = _super.call(this, InferredProject.newName(), ProjectKind.Inferred, projectService, documentRegistry, 
-                // TODO: GH#18217
-                /*files*/ undefined, 
-                /*lastFileExceededProgramSize*/ undefined, compilerOptions, 
-                /*compileOnSaveEnabled*/ false, projectService.host, currentDirectory) || this;
+                var _this = _super.call(this, InferredProject.newName(), ProjectKind.Inferred, projectService, documentRegistry, undefined, undefined, compilerOptions, false, projectService.host, currentDirectory) || this;
                 _this._isJsInferredProject = false;
                 _this.projectRootPath = projectRootPath && projectService.toCanonicalFileName(projectRootPath);
                 if (!projectRootPath && !projectService.useSingleInferredProject) {
@@ -112370,7 +113519,6 @@ var ts;
                 }
             };
             InferredProject.prototype.setCompilerOptions = function (options) {
-                // Avoid manipulating the given options directly
                 var newOptions = options ? ts.cloneCompilerOptions(options) : this.getCompilationSettings();
                 if (!newOptions) {
                     return;
@@ -112388,7 +113536,7 @@ var ts;
                 ts.Debug.assert(info.isScriptOpen());
                 this.projectService.startWatchingConfigFilesForInferredProjectRoot(info);
                 if (!this._isJsInferredProject && info.isJavaScript()) {
-                    this.toggleJsInferredProject(/*isJsInferredProject*/ true);
+                    this.toggleJsInferredProject(true);
                 }
                 _super.prototype.addRoot.call(this, info);
             };
@@ -112397,18 +113545,14 @@ var ts;
                 _super.prototype.removeRoot.call(this, info);
                 if (this._isJsInferredProject && info.isJavaScript()) {
                     if (ts.every(this.getRootScriptInfos(), function (rootInfo) { return !rootInfo.isJavaScript(); })) {
-                        this.toggleJsInferredProject(/*isJsInferredProject*/ false);
+                        this.toggleJsInferredProject(false);
                     }
                 }
             };
-            /*@internal*/
             InferredProject.prototype.isOrphan = function () {
                 return !this.hasRoots();
             };
             InferredProject.prototype.isProjectWithSingleRoot = function () {
-                // - when useSingleInferredProject is not set and projectRootPath is not set,
-                //   we can guarantee that this will be the only root
-                // - other wise it has single root if it has single root script info
                 return (!this.projectRootPath && !this.projectService.useSingleInferredProject) ||
                     this.getRootScriptInfos().length === 1;
             };
@@ -112435,28 +113579,17 @@ var ts;
             return InferredProject;
         }(Project));
         server.InferredProject = InferredProject;
-        /**
-         * If a file is opened, the server will look for a tsconfig (or jsconfig)
-         * and if successfull create a ConfiguredProject for it.
-         * Otherwise it will create an InferredProject.
-         */
-        var ConfiguredProject = /** @class */ (function (_super) {
+        var ConfiguredProject = (function (_super) {
             __extends(ConfiguredProject, _super);
-            /*@internal*/
             function ConfiguredProject(configFileName, projectService, documentRegistry, hasExplicitListOfFiles, compilerOptions, lastFileExceededProgramSize, compileOnSaveEnabled, cachedDirectoryStructureHost, projectReferences) {
                 var _this = _super.call(this, configFileName, ProjectKind.Configured, projectService, documentRegistry, hasExplicitListOfFiles, lastFileExceededProgramSize, compilerOptions, compileOnSaveEnabled, cachedDirectoryStructureHost, ts.getDirectoryPath(configFileName)) || this;
                 _this.compileOnSaveEnabled = compileOnSaveEnabled;
                 _this.projectReferences = projectReferences;
-                /** Ref count to the project when opened from external project */
                 _this.externalProjectRefCount = 0;
                 _this.canonicalConfigFilePath = server.asNormalizedPath(projectService.toCanonicalFileName(configFileName));
                 _this.enablePlugins();
                 return _this;
             }
-            /**
-             * If the project has reload from disk pending, it reloads (and then updates graph as part of that) instead of just updating the graph
-             * @returns: true if set of files in the project stays the same and false - otherwise.
-             */
             ConfiguredProject.prototype.updateGraph = function () {
                 var reloadLevel = this.pendingReload;
                 this.pendingReload = ts.ConfigFileProgramReloadLevel.None;
@@ -112470,7 +113603,6 @@ var ts;
                         return _super.prototype.updateGraph.call(this);
                 }
             };
-            /*@internal*/
             ConfiguredProject.prototype.getCachedDirectoryStructureHost = function () {
                 return this.directoryStructureHost;
             };
@@ -112490,15 +113622,12 @@ var ts;
                     this.projectService.logger.info("Plugins were requested but not running in environment that supports 'require'. Nothing will be loaded");
                     return;
                 }
-                // Search our peer node_modules, then any globally-specified probe paths
-                // ../../.. to walk from X/node_modules/typescript/lib/tsserver.js to X/node_modules/
                 var searchPaths = [ts.combinePaths(this.projectService.getExecutingFilePath(), "../../..")].concat(this.projectService.pluginProbeLocations);
                 if (this.projectService.allowLocalPluginLoads) {
                     var local = ts.getDirectoryPath(this.canonicalConfigFilePath);
                     this.projectService.logger.info("Local plugin loading enabled; adding " + local + " to search paths");
                     searchPaths.unshift(local);
                 }
-                // Enable tsconfig-specified plugins
                 if (options.plugins) {
                     for (var _i = 0, _a = options.plugins; _i < _a.length; _i++) {
                         var pluginConfigEntry = _a[_i];
@@ -112507,15 +113636,9 @@ var ts;
                 }
                 this.enableGlobalPlugins();
             };
-            /**
-             * Get the errors that dont have any file name associated
-             */
             ConfiguredProject.prototype.getGlobalProjectErrors = function () {
                 return ts.filter(this.projectErrors, function (diagnostic) { return !diagnostic.file; }) || server.emptyArray;
             };
-            /**
-             * Get all the project errors
-             */
             ConfiguredProject.prototype.getAllProjectErrors = function () {
                 return this.projectErrors || server.emptyArray;
             };
@@ -112528,14 +113651,10 @@ var ts;
             ConfiguredProject.prototype.getTypeAcquisition = function () {
                 return this.typeAcquisition;
             };
-            /*@internal*/
             ConfiguredProject.prototype.watchWildcards = function (wildcardDirectories) {
                 var _this = this;
-                ts.updateWatchingWildcardDirectories(this.directoriesWatchedForWildcards || (this.directoriesWatchedForWildcards = ts.createMap()), wildcardDirectories, 
-                // Create new directory watcher
-                function (directory, flags) { return _this.projectService.watchWildcardDirectory(directory, flags, _this); });
+                ts.updateWatchingWildcardDirectories(this.directoriesWatchedForWildcards || (this.directoriesWatchedForWildcards = ts.createMap()), wildcardDirectories, function (directory, flags) { return _this.projectService.watchWildcardDirectory(directory, flags, _this); });
             };
-            /*@internal*/
             ConfiguredProject.prototype.stopWatchingWildCards = function () {
                 if (this.directoriesWatchedForWildcards) {
                     ts.clearMap(this.directoriesWatchedForWildcards, ts.closeFileWatcherOf);
@@ -112552,62 +113671,44 @@ var ts;
                 this.configFileSpecs = undefined;
                 _super.prototype.close.call(this);
             };
-            /* @internal */
             ConfiguredProject.prototype.addExternalProjectReference = function () {
                 this.externalProjectRefCount++;
             };
-            /* @internal */
             ConfiguredProject.prototype.deleteExternalProjectReference = function () {
                 this.externalProjectRefCount--;
             };
-            /** Returns true if the project is needed by any of the open script info/external project */
-            /* @internal */
             ConfiguredProject.prototype.hasOpenRef = function () {
                 var _this = this;
                 if (!!this.externalProjectRefCount) {
                     return true;
                 }
-                // Closed project doesnt have any reference
                 if (this.isClosed()) {
                     return false;
                 }
                 var configFileExistenceInfo = this.projectService.getConfigFileExistenceInfo(this);
                 if (this.projectService.hasPendingProjectUpdate(this)) {
-                    // If there is pending update for this project,
-                    // we dont know if this project would be needed by any of the open files impacted by this config file
-                    // In that case keep the project alive if there are open files impacted by this project
                     return !!configFileExistenceInfo.openFilesImpactedByConfigFile.size;
                 }
-                // If there is no pending update for this project,
-                // We know exact set of open files that get impacted by this configured project as the files in the project
-                // The project is referenced only if open files impacted by this project are present in this project
                 return ts.forEachEntry(configFileExistenceInfo.openFilesImpactedByConfigFile, function (_value, infoPath) { return _this.containsScriptInfo(_this.projectService.getScriptInfoForPath(infoPath)); }) || false;
             };
             ConfiguredProject.prototype.getEffectiveTypeRoots = function () {
                 return ts.getEffectiveTypeRoots(this.getCompilationSettings(), this.directoryStructureHost) || [];
             };
-            /*@internal*/
             ConfiguredProject.prototype.updateErrorOnNoInputFiles = function (hasFileNames) {
                 if (hasFileNames) {
-                    ts.filterMutate(this.projectErrors, function (error) { return !ts.isErrorNoInputFiles(error); }); // TODO: GH#18217
+                    ts.filterMutate(this.projectErrors, function (error) { return !ts.isErrorNoInputFiles(error); });
                 }
-                else if (!this.configFileSpecs.filesSpecs && !ts.some(this.projectErrors, ts.isErrorNoInputFiles)) { // TODO: GH#18217
+                else if (!this.configFileSpecs.filesSpecs && !ts.some(this.projectErrors, ts.isErrorNoInputFiles)) {
                     this.projectErrors.push(ts.getErrorForNoInputFiles(this.configFileSpecs, this.getConfigFilePath()));
                 }
             };
             return ConfiguredProject;
         }(Project));
         server.ConfiguredProject = ConfiguredProject;
-        /**
-         * Project whose configuration is handled externally, such as in a '.csproj'.
-         * These are created only if a host explicitly calls `openExternalProject`.
-         */
-        var ExternalProject = /** @class */ (function (_super) {
+        var ExternalProject = (function (_super) {
             __extends(ExternalProject, _super);
-            /*@internal*/
             function ExternalProject(externalProjectName, projectService, documentRegistry, compilerOptions, lastFileExceededProgramSize, compileOnSaveEnabled, projectFilePath) {
-                var _this = _super.call(this, externalProjectName, ProjectKind.External, projectService, documentRegistry, 
-                /*hasExplicitListOfFiles*/ true, lastFileExceededProgramSize, compilerOptions, compileOnSaveEnabled, projectService.host, ts.getDirectoryPath(projectFilePath || ts.normalizeSlashes(externalProjectName))) || this;
+                var _this = _super.call(this, externalProjectName, ProjectKind.External, projectService, documentRegistry, true, lastFileExceededProgramSize, compilerOptions, compileOnSaveEnabled, projectService.host, ts.getDirectoryPath(projectFilePath || ts.normalizeSlashes(externalProjectName))) || this;
                 _this.externalProjectName = externalProjectName;
                 _this.compileOnSaveEnabled = compileOnSaveEnabled;
                 _this.excludedFiles = [];
@@ -112636,7 +113737,6 @@ var ts;
     var server;
     (function (server) {
         server.maxProgramSizeForNonTsFiles = 20 * 1024 * 1024;
-        // tslint:disable variable-name
         server.ProjectsUpdatedInBackgroundEvent = "projectsUpdatedInBackground";
         server.ConfigFileDiagEvent = "configFileDiag";
         server.ProjectLanguageServiceStateEvent = "projectLanguageServiceState";
@@ -112648,7 +113748,6 @@ var ts;
                 var option = commandLineOptions_1[_i];
                 if (typeof option.type === "object") {
                     var optionMap = option.type;
-                    // verify that map contains only numbers
                     optionMap.forEach(function (value) {
                         ts.Debug.assert(typeof value === "number");
                     });
@@ -112663,47 +113762,25 @@ var ts;
             block: ts.IndentStyle.Block,
             smart: ts.IndentStyle.Smart
         });
-        /**
-         * How to understand this block:
-         *  * The 'match' property is a regexp that matches a filename.
-         *  * If 'match' is successful, then:
-         *     * All files from 'exclude' are removed from the project. See below.
-         *     * All 'types' are included in ATA
-         *  * What the heck is 'exclude' ?
-         *     * An array of an array of strings and numbers
-         *     * Each array is:
-         *       * An array of strings and numbers
-         *       * The strings are literals
-         *       * The numbers refer to capture group indices from the 'match' regexp
-         *          * Remember that '1' is the first group
-         *       * These are concatenated together to form a new regexp
-         *       * Filenames matching these regexps are excluded from the project
-         * This default value is tested in tsserverProjectSystem.ts; add tests there
-         *   if you are changing this so that you can be sure your regexp works!
-         */
         var defaultTypeSafeList = {
             "jquery": {
-                // jquery files can have names like "jquery-1.10.2.min.js" (or "jquery.intellisense.js")
                 match: /jquery(-(\.?\d+)+)?(\.intellisense)?(\.min)?\.js$/i,
                 types: ["jquery"]
             },
             "WinJS": {
-                // e.g. c:/temp/UWApp1/lib/winjs-4.0.1/js/base.js
                 match: /^(.*\/winjs-[.\d]+)\/js\/base\.js$/i,
                 exclude: [["^", 1, "/.*"]],
-                types: ["winjs"] // And fetch the @types package for WinJS
+                types: ["winjs"]
             },
             "Kendo": {
-                // e.g. /Kendo3/wwwroot/lib/kendo/kendo.all.min.js
                 match: /^(.*\/kendo(-ui)?)\/kendo\.all(\.min)?\.js$/i,
                 exclude: [["^", 1, "/.*"]],
                 types: ["kendo-ui"]
             },
             "Office Nuget": {
-                // e.g. /scripts/Office/1/excel-15.debug.js
                 match: /^(.*\/office\/1)\/excel-\d+\.debug\.js$/i,
                 exclude: [["^", 1, "/.*"]],
-                types: ["office"] // @types package to fetch instead
+                types: ["office"]
             },
             "References": {
                 match: /^(.*\/_references\.js)$/i,
@@ -112735,15 +113812,15 @@ var ts;
         function convertScriptKindName(scriptKindName) {
             switch (scriptKindName) {
                 case "JS":
-                    return 1 /* JS */;
+                    return 1;
                 case "JSX":
-                    return 2 /* JSX */;
+                    return 2;
                 case "TS":
-                    return 3 /* TS */;
+                    return 3;
                 case "TSX":
-                    return 4 /* TSX */;
+                    return 4;
                 default:
-                    return 0 /* Unknown */;
+                    return 0;
             }
         }
         server.convertScriptKindName = convertScriptKindName;
@@ -112763,7 +113840,7 @@ var ts;
                         });
                     }
                 }
-                return result; // TODO: GH#18217
+                return result;
             },
             hasMixedContent: function (fileName, extraFileExtensions) { return ts.some(extraFileExtensions, function (ext) { return ext.isMixedContent && ts.fileExtensionIs(fileName, ext.extension); }); },
         };
@@ -112780,7 +113857,6 @@ var ts;
                 }
             }
         }
-        /* @internal */
         var WatchType;
         (function (WatchType) {
             WatchType["ConfigFilePath"] = "Config file for the program";
@@ -112807,56 +113883,23 @@ var ts;
         function updateProjectIfDirty(project) {
             return project.dirty && project.updateGraph();
         }
-        var ProjectService = /** @class */ (function () {
+        var ProjectService = (function () {
             function ProjectService(opts) {
                 var _this = this;
-                /**
-                 * Container of all known scripts
-                 */
                 this.filenameToScriptInfo = ts.createMap();
-                // Set of all '.js' files ever opened.
                 this.allJsFilesForOpenFileTelemetry = ts.createMap();
-                /**
-                 * maps external project file name to list of config files that were the part of this project
-                 */
                 this.externalProjectToConfiguredProjectMap = ts.createMap();
-                /**
-                 * external projects (configuration and list of root files is not controlled by tsserver)
-                 */
                 this.externalProjects = [];
-                /**
-                 * projects built from openFileRoots
-                 */
                 this.inferredProjects = [];
-                /**
-                 * projects specified by a tsconfig.json file
-                 */
                 this.configuredProjects = ts.createMap();
-                /**
-                 * Open files: with value being project root path, and key being Path of the file that is open
-                 */
                 this.openFiles = ts.createMap();
-                /**
-                 * Map of open files that are opened without complete path but have projectRoot as current directory
-                 */
                 this.openFilesWithNonRootedDiskPath = ts.createMap();
                 this.compilerOptionsForInferredProjectsPerProjectRoot = ts.createMap();
-                /**
-                 * Project size for configured or external projects
-                 */
                 this.projectToSizeMap = ts.createMap();
-                /**
-                 * This is a map of config file paths existance that doesnt need query to disk
-                 * - The entry can be present because there is inferred project that needs to watch addition of config file to directory
-                 *   In this case the exists could be true/false based on config file is present or not
-                 * - Or it is present if we have configured project open with config file at that location
-                 *   In this case the exists property is always true
-                 */
                 this.configFileExistenceInfoCache = ts.createMap();
                 this.safelist = defaultTypeSafeList;
                 this.legacySafelist = {};
                 this.pendingProjectUpdates = ts.createMap();
-                /** Tracks projects that we have already sent telemetry for. */
                 this.seenProjects = ts.createMap();
                 this.host = opts.host;
                 this.logger = opts.logger;
@@ -112905,33 +113948,26 @@ var ts;
             ProjectService.prototype.toPath = function (fileName) {
                 return ts.toPath(fileName, this.currentDirectory, this.toCanonicalFileName);
             };
-            /*@internal*/
             ProjectService.prototype.getExecutingFilePath = function () {
                 return this.getNormalizedAbsolutePath(this.host.getExecutingFilePath());
             };
-            /*@internal*/
             ProjectService.prototype.getNormalizedAbsolutePath = function (fileName) {
                 return ts.getNormalizedAbsolutePath(fileName, this.host.getCurrentDirectory());
             };
-            /*@internal*/
             ProjectService.prototype.setDocument = function (key, path, sourceFile) {
                 var info = ts.Debug.assertDefined(this.getScriptInfoForPath(path));
                 info.cacheSourceFile = { key: key, sourceFile: sourceFile };
             };
-            /*@internal*/
             ProjectService.prototype.getDocument = function (key, path) {
                 var info = this.getScriptInfoForPath(path);
                 return info && info.cacheSourceFile && info.cacheSourceFile.key === key ? info.cacheSourceFile.sourceFile : undefined;
             };
-            /* @internal */
             ProjectService.prototype.ensureInferredProjectsUpToDate_TestOnly = function () {
                 this.ensureProjectStructuresUptoDate();
             };
-            /* @internal */
             ProjectService.prototype.getCompilerOptionsForInferredProjects = function () {
                 return this.compilerOptionsForInferredProjects;
             };
-            /* @internal */
             ProjectService.prototype.onUpdateLanguageServiceStateForProject = function (project, languageServiceEnabled) {
                 if (!this.eventHandler) {
                     return;
@@ -112944,18 +113980,16 @@ var ts;
             };
             ProjectService.prototype.loadTypesMap = function () {
                 try {
-                    var fileContent = this.host.readFile(this.typesMapLocation); // TODO: GH#18217
+                    var fileContent = this.host.readFile(this.typesMapLocation);
                     if (fileContent === undefined) {
                         this.logger.info("Provided types map file \"" + this.typesMapLocation + "\" doesn't exist");
                         return;
                     }
                     var raw = JSON.parse(fileContent);
-                    // Parse the regexps
                     for (var _i = 0, _a = Object.keys(raw.typesMap); _i < _a.length; _i++) {
                         var k = _a[_i];
                         raw.typesMap[k].match = new RegExp(raw.typesMap[k].match, "i");
                     }
-                    // raw is now fixed and ready
                     this.safelist = raw.typesMap;
                     for (var key in raw.simpleMap) {
                         if (raw.simpleMap.hasOwnProperty(key)) {
@@ -112976,12 +114010,10 @@ var ts;
                 }
                 switch (response.kind) {
                     case server.ActionSet:
-                        // Update the typing files and update the project
                         project.updateTypingFiles(this.typingsCache.updateTypingsForProject(response.projectName, response.compilerOptions, response.typeAcquisition, response.unresolvedImports, response.typings));
                         break;
                     case server.ActionInvalidate:
-                        // Do not clear resolution cache, there was changes detected in typings, so enque typing request and let it get us correct results
-                        this.typingsCache.enqueueInstallTypingsForProject(project, project.lastCachedUnresolvedImportsList, /*forceRefresh*/ true);
+                        this.typingsCache.enqueueInstallTypingsForProject(project, project.lastCachedUnresolvedImportsList, true);
                         return;
                 }
                 this.delayUpdateProjectGraphAndEnsureProjectStructureForOpenFiles(project);
@@ -112989,15 +114021,13 @@ var ts;
             ProjectService.prototype.delayEnsureProjectForOpenFiles = function () {
                 var _this = this;
                 this.pendingEnsureProjectForOpenFiles = true;
-                this.throttledOperations.schedule("*ensureProjectForOpenFiles*", /*delay*/ 250, function () {
+                this.throttledOperations.schedule("*ensureProjectForOpenFiles*", 250, function () {
                     if (_this.pendingProjectUpdates.size !== 0) {
                         _this.delayEnsureProjectForOpenFiles();
                     }
                     else {
                         if (_this.pendingEnsureProjectForOpenFiles) {
                             _this.ensureProjectForOpenFiles();
-                            // Send the event to notify that there were background project updates
-                            // send current list of open files
                             _this.sendProjectsUpdatedInBackgroundEvent();
                         }
                     }
@@ -113008,17 +114038,15 @@ var ts;
                 project.markAsDirty();
                 var projectName = project.getProjectName();
                 this.pendingProjectUpdates.set(projectName, project);
-                this.throttledOperations.schedule(projectName, /*delay*/ 250, function () {
+                this.throttledOperations.schedule(projectName, 250, function () {
                     if (_this.pendingProjectUpdates.delete(projectName)) {
                         project.updateGraph();
                     }
                 });
             };
-            /*@internal*/
             ProjectService.prototype.hasPendingProjectUpdate = function (project) {
                 return this.pendingProjectUpdates.has(project.getProjectName());
             };
-            /* @internal */
             ProjectService.prototype.sendProjectsUpdatedInBackgroundEvent = function () {
                 var _this = this;
                 if (!this.eventHandler) {
@@ -113032,7 +114060,6 @@ var ts;
                 };
                 this.eventHandler(event);
             };
-            /* @internal */
             ProjectService.prototype.delayUpdateProjectGraphAndEnsureProjectStructureForOpenFiles = function (project) {
                 this.delayUpdateProjectGraph(project);
                 this.delayEnsureProjectForOpenFiles();
@@ -113049,8 +114076,6 @@ var ts;
             ProjectService.prototype.setCompilerOptionsForInferredProjects = function (projectCompilerOptions, projectRootPath) {
                 ts.Debug.assert(projectRootPath === undefined || this.useInferredProjectPerProjectRoot, "Setting compiler options per project root path is only supported when useInferredProjectPerProjectRoot is enabled");
                 var compilerOptions = convertCompilerOptions(projectCompilerOptions);
-                // always set 'allowNonTsExtensions' for inferred projects since user cannot configure it from the outside
-                // previously we did not expose a way for user to change these settings and this option was enabled by default
                 compilerOptions.allowNonTsExtensions = true;
                 var canonicalProjectRootPath = projectRootPath && this.toCanonicalFileName(projectRootPath);
                 if (canonicalProjectRootPath) {
@@ -113061,14 +114086,6 @@ var ts;
                 }
                 for (var _i = 0, _a = this.inferredProjects; _i < _a.length; _i++) {
                     var project = _a[_i];
-                    // Only update compiler options in the following cases:
-                    // - Inferred projects without a projectRootPath, if the new options do not apply to
-                    //   a workspace root
-                    // - Inferred projects with a projectRootPath, if the new options do not apply to a
-                    //   workspace root and there is no more specific set of options for that project's
-                    //   root path
-                    // - Inferred projects with a projectRootPath, if the new options apply to that
-                    //   project root path.
                     if (canonicalProjectRootPath ?
                         project.projectRootPath === canonicalProjectRootPath :
                         !project.projectRootPath || !this.compilerOptionsForInferredProjectsPerProjectRoot.has(project.projectRootPath)) {
@@ -113105,13 +114122,6 @@ var ts;
                 this.ensureProjectStructuresUptoDate();
                 return this.getScriptInfo(uncheckedFileName);
             };
-            /**
-             * Ensures the project structures are upto date
-             * This means,
-             * - we go through all the projects and update them if they are dirty
-             * - if updates reflect some change in structure or there was pending request to ensure projects for open files
-             *   ensure that each open script info has project
-             */
             ProjectService.prototype.ensureProjectStructuresUptoDate = function () {
                 var hasChanges = this.pendingEnsureProjectForOpenFiles;
                 this.pendingProjectUpdates.clear();
@@ -113139,12 +114149,9 @@ var ts;
                     this.logger.msg("Error: got watch notification for unknown file: " + fileName);
                 }
                 else if (eventKind === ts.FileWatcherEventKind.Deleted) {
-                    // File was deleted
                     this.handleDeletedFile(info);
                 }
                 else if (!info.isScriptOpen()) {
-                    // file has been changed which might affect the set of referenced files in projects that include
-                    // this file and set of inferred projects
                     info.delayReloadNonMixedContentFile();
                     this.delayUpdateProjectGraphs(info.containingProjects);
                 }
@@ -113153,87 +114160,58 @@ var ts;
                 this.stopWatchingScriptInfo(info);
                 if (!info.isScriptOpen()) {
                     this.deleteScriptInfo(info);
-                    // capture list of projects since detachAllProjects will wipe out original list
                     var containingProjects = info.containingProjects.slice();
                     info.detachAllProjects();
-                    // update projects to make sure that set of referenced files is correct
                     this.delayUpdateProjectGraphs(containingProjects);
                 }
             };
-            /**
-             * This is to watch whenever files are added or removed to the wildcard directories
-             */
-            /*@internal*/
             ProjectService.prototype.watchWildcardDirectory = function (directory, flags, project) {
                 var _this = this;
                 return this.watchFactory.watchDirectory(this.host, directory, function (fileOrDirectory) {
                     var fileOrDirectoryPath = _this.toPath(fileOrDirectory);
                     project.getCachedDirectoryStructureHost().addOrDeleteFileOrDirectory(fileOrDirectory, fileOrDirectoryPath);
                     var configFilename = project.getConfigFilePath();
-                    // If the the added or created file or directory is not supported file name, ignore the file
-                    // But when watched directory is added/removed, we need to reload the file list
                     if (fileOrDirectoryPath !== directory && ts.hasExtension(fileOrDirectoryPath) && !ts.isSupportedSourceFileName(fileOrDirectory, project.getCompilationSettings(), _this.hostConfiguration.extraFileExtensions)) {
                         _this.logger.info("Project: " + configFilename + " Detected file add/remove of non supported extension: " + fileOrDirectory);
                         return;
                     }
-                    // Reload is pending, do the reload
                     if (project.pendingReload !== ts.ConfigFileProgramReloadLevel.Full) {
                         project.pendingReload = ts.ConfigFileProgramReloadLevel.Partial;
                         _this.delayUpdateProjectGraphAndEnsureProjectStructureForOpenFiles(project);
                     }
-                }, flags, "Wild card directory" /* WildcardDirectories */, project);
+                }, flags, "Wild card directory", project);
             };
-            /** Gets the config file existence info for the configured project */
-            /*@internal*/
             ProjectService.prototype.getConfigFileExistenceInfo = function (project) {
                 return this.configFileExistenceInfoCache.get(project.canonicalConfigFilePath);
             };
             ProjectService.prototype.onConfigChangedForConfiguredProject = function (project, eventKind) {
                 var configFileExistenceInfo = this.getConfigFileExistenceInfo(project);
                 if (eventKind === ts.FileWatcherEventKind.Deleted) {
-                    // Update the cached status
-                    // We arent updating or removing the cached config file presence info as that will be taken care of by
-                    // setConfigFilePresenceByClosedConfigFile when the project is closed (depending on tracking open files)
                     configFileExistenceInfo.exists = false;
                     this.removeProject(project);
-                    // Reload the configured projects for the open files in the map as they are affectected by this config file
-                    // Since the configured project was deleted, we want to reload projects for all the open files including files
-                    // that are not root of the inferred project
-                    this.logConfigFileWatchUpdate(project.getConfigFilePath(), project.canonicalConfigFilePath, configFileExistenceInfo, "Reloading configured projects for files" /* ReloadingFiles */);
-                    this.delayReloadConfiguredProjectForFiles(configFileExistenceInfo, /*ignoreIfNotInferredProjectRoot*/ false);
+                    this.logConfigFileWatchUpdate(project.getConfigFilePath(), project.canonicalConfigFilePath, configFileExistenceInfo, "Reloading configured projects for files");
+                    this.delayReloadConfiguredProjectForFiles(configFileExistenceInfo, false);
                 }
                 else {
-                    this.logConfigFileWatchUpdate(project.getConfigFilePath(), project.canonicalConfigFilePath, configFileExistenceInfo, "Reloading configured projects for only inferred root files" /* ReloadingInferredRootFiles */);
+                    this.logConfigFileWatchUpdate(project.getConfigFilePath(), project.canonicalConfigFilePath, configFileExistenceInfo, "Reloading configured projects for only inferred root files");
                     project.pendingReload = ts.ConfigFileProgramReloadLevel.Full;
                     this.delayUpdateProjectGraph(project);
-                    // As we scheduled the update on configured project graph,
-                    // we would need to schedule the project reload for only the root of inferred projects
-                    this.delayReloadConfiguredProjectForFiles(configFileExistenceInfo, /*ignoreIfNotInferredProjectRoot*/ true);
+                    this.delayReloadConfiguredProjectForFiles(configFileExistenceInfo, true);
                 }
             };
-            /**
-             * This is the callback function for the config file add/remove/change at any location
-             * that matters to open script info but doesnt have configured project open
-             * for the config file
-             */
             ProjectService.prototype.onConfigFileChangeForOpenScriptInfo = function (configFileName, eventKind) {
-                // This callback is called only if we dont have config file project for this config file
                 var canonicalConfigPath = server.normalizedPathToPath(configFileName, this.currentDirectory, this.toCanonicalFileName);
                 var configFileExistenceInfo = this.configFileExistenceInfoCache.get(canonicalConfigPath);
                 configFileExistenceInfo.exists = (eventKind !== ts.FileWatcherEventKind.Deleted);
-                this.logConfigFileWatchUpdate(configFileName, canonicalConfigPath, configFileExistenceInfo, "Reloading configured projects for files" /* ReloadingFiles */);
-                // Because there is no configured project open for the config file, the tracking open files map
-                // will only have open files that need the re-detection of the project and hence
-                // reload projects for all the tracking open files in the map
-                this.delayReloadConfiguredProjectForFiles(configFileExistenceInfo, /*ignoreIfNotInferredProjectRoot*/ false);
+                this.logConfigFileWatchUpdate(configFileName, canonicalConfigPath, configFileExistenceInfo, "Reloading configured projects for files");
+                this.delayReloadConfiguredProjectForFiles(configFileExistenceInfo, false);
             };
             ProjectService.prototype.removeProject = function (project) {
                 this.logger.info("remove project: " + project.getRootFiles().toString());
                 project.close();
-                if (ts.Debug.shouldAssert(1 /* Normal */)) {
+                if (ts.Debug.shouldAssert(1)) {
                     this.filenameToScriptInfo.forEach(function (info) { return ts.Debug.assert(!info.isAttached(project)); });
                 }
-                // Remove the project from pending project updates
                 this.pendingProjectUpdates.delete(project.getProjectName());
                 switch (project.projectKind) {
                     case server.ProjectKind.External:
@@ -113250,7 +114228,6 @@ var ts;
                         break;
                 }
             };
-            /*@internal*/
             ProjectService.prototype.assignOrphanScriptInfoToInferredProject = function (info, projectRootPath) {
                 ts.Debug.assert(info.isOrphan());
                 var project = this.getOrCreateInferredProjectForProjectRootPathIfEnabled(info, projectRootPath) ||
@@ -113258,47 +114235,30 @@ var ts;
                     this.getOrCreateSingleInferredWithoutProjectRoot(info.isDynamic ? this.currentDirectory : ts.getDirectoryPath(info.path));
                 project.addRoot(info);
                 if (info.containingProjects[0] !== project) {
-                    // Ensure this is first project, we could be in this scenario because info could be part of orphan project
                     info.detachFromProject(project);
                     info.containingProjects.unshift(project);
                 }
                 project.updateGraph();
                 if (!this.useSingleInferredProject && !project.projectRootPath) {
-                    var _loop_27 = function (inferredProject) {
+                    var _loop_2 = function (inferredProject) {
                         if (inferredProject === project || inferredProject.isOrphan()) {
                             return "continue";
                         }
-                        // Remove the inferred project if the root of it is now part of newly created inferred project
-                        // e.g through references
-                        // Which means if any root of inferred project is part of more than 1 project can be removed
-                        // This logic is same as iterating over all open files and calling
-                        // this.removeRootOfInferredProjectIfNowPartOfOtherProject(f);
-                        // Since this is also called from refreshInferredProject and closeOpen file
-                        // to update inferred projects of the open file, this iteration might be faster
-                        // instead of scanning all open files
                         var roots = inferredProject.getRootScriptInfos();
                         ts.Debug.assert(roots.length === 1 || !!inferredProject.projectRootPath);
                         if (roots.length === 1 && ts.forEach(roots[0].containingProjects, function (p) { return p !== roots[0].containingProjects[0] && !p.isOrphan(); })) {
-                            inferredProject.removeFile(roots[0], /*fileExists*/ true, /*detachFromProject*/ true);
+                            inferredProject.removeFile(roots[0], true, true);
                         }
                     };
-                    // Note that we need to create a copy of the array since the list of project can change
                     for (var _i = 0, _a = this.inferredProjects; _i < _a.length; _i++) {
                         var inferredProject = _a[_i];
-                        _loop_27(inferredProject);
+                        _loop_2(inferredProject);
                     }
                 }
                 return project;
             };
-            /**
-             * Remove this file from the set of open, non-configured files.
-             * @param info The file that has been closed or newly configured
-             */
             ProjectService.prototype.closeOpenFile = function (info) {
                 var _this = this;
-                // Closing file should trigger re-reading the file content from disk. This is
-                // because the user may chose to discard the buffer content before saving
-                // to the disk, and the server's version of the file can be out of sync.
                 var fileExists = this.host.fileExists(info.fileName);
                 info.close(fileExists);
                 this.stopWatchingConfigFilesForClosedScriptInfo(info);
@@ -113306,7 +114266,6 @@ var ts;
                 if (this.openFilesWithNonRootedDiskPath.get(canonicalFileName) === info) {
                     this.openFilesWithNonRootedDiskPath.delete(canonicalFileName);
                 }
-                // collect all projects that should be removed
                 var ensureProjectsForOpenFiles = false;
                 for (var _i = 0, _a = info.containingProjects; _i < _a.length; _i++) {
                     var p = _a[_i];
@@ -113314,41 +114273,26 @@ var ts;
                         if (info.hasMixedContent) {
                             info.registerFileUpdate();
                         }
-                        // Do not remove the project so that we can reuse this project
-                        // if it would need to be re-created with next file open
                     }
                     else if (p.projectKind === server.ProjectKind.Inferred && p.isRoot(info)) {
-                        // If this was the last open root file of inferred project
                         if (p.isProjectWithSingleRoot()) {
                             ensureProjectsForOpenFiles = true;
                         }
-                        p.removeFile(info, fileExists, /*detachFromProject*/ true);
-                        // Do not remove the project even if this was last root of the inferred project
-                        // so that we can reuse this project, if it would need to be re-created with next file open
+                        p.removeFile(info, fileExists, true);
                     }
                     if (!p.languageServiceEnabled) {
-                        // if project language service is disabled then we create a program only for open files.
-                        // this means that project should be marked as dirty to force rebuilding of the program
-                        // on the next request
                         p.markAsDirty();
                     }
                 }
                 this.openFiles.delete(info.path);
                 if (ensureProjectsForOpenFiles) {
-                    // collect orphaned files and assign them to inferred project just like we treat open of a file
                     this.openFiles.forEach(function (projectRootPath, path) {
                         var info = _this.getScriptInfoForPath(path);
-                        // collect all orphaned script infos from open files
                         if (info.isOrphan()) {
                             _this.assignOrphanScriptInfoToInferredProject(info, projectRootPath);
                         }
                     });
                 }
-                // Cleanup script infos that arent part of any project (eg. those could be closed script infos not referenced by any project)
-                // is postponed to next file open so that if file from same project is opened,
-                // we wont end up creating same script infos
-                // If the current info is being just closed - add the watcher file to track changes
-                // But if file was deleted, handle that part
                 if (fileExists) {
                     this.watchClosedScriptInfo(info);
                 }
@@ -113360,60 +114304,44 @@ var ts;
                 this.filenameToScriptInfo.delete(info.path);
                 var realpath = info.getRealpathIfDifferent();
                 if (realpath) {
-                    this.realpathToScriptInfos.remove(realpath, info); // TODO: GH#18217
+                    this.realpathToScriptInfos.remove(realpath, info);
                 }
             };
             ProjectService.prototype.configFileExists = function (configFileName, canonicalConfigFilePath, info) {
                 var configFileExistenceInfo = this.configFileExistenceInfoCache.get(canonicalConfigFilePath);
                 if (configFileExistenceInfo) {
-                    // By default the info would get impacted by presence of config file since its in the detection path
-                    // Only adding the info as a root to inferred project will need the existence to be watched by file watcher
                     if (!configFileExistenceInfo.openFilesImpactedByConfigFile.has(info.path)) {
                         configFileExistenceInfo.openFilesImpactedByConfigFile.set(info.path, false);
-                        this.logConfigFileWatchUpdate(configFileName, canonicalConfigFilePath, configFileExistenceInfo, "File added to open files impacted by this config file" /* OpenFilesImpactedByConfigFileAdd */);
+                        this.logConfigFileWatchUpdate(configFileName, canonicalConfigFilePath, configFileExistenceInfo, "File added to open files impacted by this config file");
                     }
                     return configFileExistenceInfo.exists;
                 }
-                // Theoretically we should be adding watch for the directory here itself.
-                // In practice there will be very few scenarios where the config file gets added
-                // somewhere inside the another config file directory.
-                // And technically we could handle that case in configFile's directory watcher in some cases
-                // But given that its a rare scenario it seems like too much overhead. (we werent watching those directories earlier either)
-                // So what we are now watching is: configFile if the configured project corresponding to it is open
-                // Or the whole chain of config files for the roots of the inferred projects
-                // Cache the host value of file exists and add the info to map of open files impacted by this config file
                 var openFilesImpactedByConfigFile = ts.createMap();
                 openFilesImpactedByConfigFile.set(info.path, false);
                 var exists = this.host.fileExists(configFileName);
                 configFileExistenceInfo = { exists: exists, openFilesImpactedByConfigFile: openFilesImpactedByConfigFile };
                 this.configFileExistenceInfoCache.set(canonicalConfigFilePath, configFileExistenceInfo);
-                this.logConfigFileWatchUpdate(configFileName, canonicalConfigFilePath, configFileExistenceInfo, "File added to open files impacted by this config file" /* OpenFilesImpactedByConfigFileAdd */);
+                this.logConfigFileWatchUpdate(configFileName, canonicalConfigFilePath, configFileExistenceInfo, "File added to open files impacted by this config file");
                 return exists;
             };
             ProjectService.prototype.setConfigFileExistenceByNewConfiguredProject = function (project) {
                 var configFileExistenceInfo = this.getConfigFileExistenceInfo(project);
                 if (configFileExistenceInfo) {
                     ts.Debug.assert(configFileExistenceInfo.exists);
-                    // close existing watcher
                     if (configFileExistenceInfo.configFileWatcherForRootOfInferredProject) {
                         var configFileName = project.getConfigFilePath();
                         configFileExistenceInfo.configFileWatcherForRootOfInferredProject.close();
                         configFileExistenceInfo.configFileWatcherForRootOfInferredProject = undefined;
-                        this.logConfigFileWatchUpdate(configFileName, project.canonicalConfigFilePath, configFileExistenceInfo, "Updated the callback" /* UpdatedCallback */);
+                        this.logConfigFileWatchUpdate(configFileName, project.canonicalConfigFilePath, configFileExistenceInfo, "Updated the callback");
                     }
                 }
                 else {
-                    // We could be in this scenario if project is the configured project tracked by external project
-                    // Since that route doesnt check if the config file is present or not
                     this.configFileExistenceInfoCache.set(project.canonicalConfigFilePath, {
                         exists: true,
                         openFilesImpactedByConfigFile: ts.createMap()
                     });
                 }
             };
-            /**
-             * Returns true if the configFileExistenceInfo is needed/impacted by open files that are root of inferred project
-             */
             ProjectService.prototype.configFileExistenceImpactsRootOfInferredProject = function (configFileExistenceInfo) {
                 return ts.forEachEntry(configFileExistenceInfo.openFilesImpactedByConfigFile, function (isRootOfInferredProject) { return isRootOfInferredProject; });
             };
@@ -113422,16 +114350,12 @@ var ts;
                 ts.Debug.assert(!!configFileExistenceInfo);
                 if (configFileExistenceInfo.openFilesImpactedByConfigFile.size) {
                     var configFileName = closedProject.getConfigFilePath();
-                    // If there are open files that are impacted by this config file existence
-                    // but none of them are root of inferred project, the config file watcher will be
-                    // created when any of the script infos are added as root of inferred project
                     if (this.configFileExistenceImpactsRootOfInferredProject(configFileExistenceInfo)) {
                         ts.Debug.assert(!configFileExistenceInfo.configFileWatcherForRootOfInferredProject);
                         this.createConfigFileWatcherOfConfigFileExistence(configFileName, closedProject.canonicalConfigFilePath, configFileExistenceInfo);
                     }
                 }
                 else {
-                    // There is not a single file open thats tracking the status of this config file. Remove from cache
                     this.configFileExistenceInfoCache.delete(closedProject.canonicalConfigFilePath);
                 }
             };
@@ -113448,36 +114372,25 @@ var ts;
                 });
                 var watches = [];
                 if (configFileExistenceInfo.configFileWatcherForRootOfInferredProject) {
-                    watches.push("Config file for the inferred project root" /* ConfigFileForInferredRoot */);
+                    watches.push("Config file for the inferred project root");
                 }
                 if (this.configuredProjects.has(canonicalConfigFilePath)) {
-                    watches.push("Config file for the program" /* ConfigFilePath */);
+                    watches.push("Config file for the program");
                 }
                 this.logger.info("ConfigFilePresence:: Current Watches: " + watches + ":: File: " + configFileName + " Currently impacted open files: RootsOfInferredProjects: " + inferredRoots + " OtherOpenFiles: " + otherFiles + " Status: " + status);
             };
-            /**
-             * Create the watcher for the configFileExistenceInfo
-             */
             ProjectService.prototype.createConfigFileWatcherOfConfigFileExistence = function (configFileName, canonicalConfigFilePath, configFileExistenceInfo) {
                 var _this = this;
-                configFileExistenceInfo.configFileWatcherForRootOfInferredProject = this.watchFactory.watchFile(this.host, configFileName, function (_filename, eventKind) { return _this.onConfigFileChangeForOpenScriptInfo(configFileName, eventKind); }, ts.PollingInterval.High, "Config file for the inferred project root" /* ConfigFileForInferredRoot */);
-                this.logConfigFileWatchUpdate(configFileName, canonicalConfigFilePath, configFileExistenceInfo, "Updated the callback" /* UpdatedCallback */);
+                configFileExistenceInfo.configFileWatcherForRootOfInferredProject = this.watchFactory.watchFile(this.host, configFileName, function (_filename, eventKind) { return _this.onConfigFileChangeForOpenScriptInfo(configFileName, eventKind); }, ts.PollingInterval.High, "Config file for the inferred project root");
+                this.logConfigFileWatchUpdate(configFileName, canonicalConfigFilePath, configFileExistenceInfo, "Updated the callback");
             };
-            /**
-             * Close the config file watcher in the cached ConfigFileExistenceInfo
-             *   if there arent any open files that are root of inferred project
-             */
             ProjectService.prototype.closeConfigFileWatcherOfConfigFileExistenceInfo = function (configFileExistenceInfo) {
-                // Close the config file watcher if there are no more open files that are root of inferred project
                 if (configFileExistenceInfo.configFileWatcherForRootOfInferredProject &&
                     !this.configFileExistenceImpactsRootOfInferredProject(configFileExistenceInfo)) {
                     configFileExistenceInfo.configFileWatcherForRootOfInferredProject.close();
                     configFileExistenceInfo.configFileWatcherForRootOfInferredProject = undefined;
                 }
             };
-            /**
-             * This is called on file close, so that we stop watching the config file for this script info
-             */
             ProjectService.prototype.stopWatchingConfigFilesForClosedScriptInfo = function (info) {
                 var _this = this;
                 ts.Debug.assert(!info.isScriptOpen());
@@ -113485,18 +114398,11 @@ var ts;
                     var configFileExistenceInfo = _this.configFileExistenceInfoCache.get(canonicalConfigFilePath);
                     if (configFileExistenceInfo) {
                         var infoIsRootOfInferredProject = configFileExistenceInfo.openFilesImpactedByConfigFile.get(info.path);
-                        // Delete the info from map, since this file is no more open
                         configFileExistenceInfo.openFilesImpactedByConfigFile.delete(info.path);
-                        _this.logConfigFileWatchUpdate(configFileName, canonicalConfigFilePath, configFileExistenceInfo, "File removed from open files impacted by this config file" /* OpenFilesImpactedByConfigFileRemove */);
-                        // If the script info was not root of inferred project,
-                        // there wont be config file watch open because of this script info
+                        _this.logConfigFileWatchUpdate(configFileName, canonicalConfigFilePath, configFileExistenceInfo, "File removed from open files impacted by this config file");
                         if (infoIsRootOfInferredProject) {
-                            // But if it is a root, it could be the last script info that is root of inferred project
-                            // and hence we would need to close the config file watcher
                             _this.closeConfigFileWatcherOfConfigFileExistenceInfo(configFileExistenceInfo);
                         }
-                        // If there are no open files that are impacted by configFileExistenceInfo after closing this script info
-                        // there is no configured project present, remove the cached existence info
                         if (!configFileExistenceInfo.openFilesImpactedByConfigFile.size &&
                             !_this.getConfiguredProjectByCanonicalConfigFilePath(canonicalConfigFilePath)) {
                             ts.Debug.assert(!configFileExistenceInfo.configFileWatcherForRootOfInferredProject);
@@ -113505,59 +114411,38 @@ var ts;
                     }
                 });
             };
-            /**
-             * This is called by inferred project whenever script info is added as a root
-             */
-            /* @internal */
             ProjectService.prototype.startWatchingConfigFilesForInferredProjectRoot = function (info) {
                 var _this = this;
                 ts.Debug.assert(info.isScriptOpen());
                 this.forEachConfigFileLocation(info, function (configFileName, canonicalConfigFilePath) {
                     var configFileExistenceInfo = _this.configFileExistenceInfoCache.get(canonicalConfigFilePath);
                     if (!configFileExistenceInfo) {
-                        // Create the cache
                         configFileExistenceInfo = {
                             exists: _this.host.fileExists(configFileName),
                             openFilesImpactedByConfigFile: ts.createMap()
                         };
                         _this.configFileExistenceInfoCache.set(canonicalConfigFilePath, configFileExistenceInfo);
                     }
-                    // Set this file as the root of inferred project
                     configFileExistenceInfo.openFilesImpactedByConfigFile.set(info.path, true);
-                    _this.logConfigFileWatchUpdate(configFileName, canonicalConfigFilePath, configFileExistenceInfo, "Open file was set as Inferred root" /* RootOfInferredProjectTrue */);
-                    // If there is no configured project for this config file, add the file watcher
+                    _this.logConfigFileWatchUpdate(configFileName, canonicalConfigFilePath, configFileExistenceInfo, "Open file was set as Inferred root");
                     if (!configFileExistenceInfo.configFileWatcherForRootOfInferredProject &&
                         !_this.getConfiguredProjectByCanonicalConfigFilePath(canonicalConfigFilePath)) {
                         _this.createConfigFileWatcherOfConfigFileExistence(configFileName, canonicalConfigFilePath, configFileExistenceInfo);
                     }
                 });
             };
-            /**
-             * This is called by inferred project whenever root script info is removed from it
-             */
-            /* @internal */
             ProjectService.prototype.stopWatchingConfigFilesForInferredProjectRoot = function (info) {
                 var _this = this;
                 this.forEachConfigFileLocation(info, function (configFileName, canonicalConfigFilePath) {
                     var configFileExistenceInfo = _this.configFileExistenceInfoCache.get(canonicalConfigFilePath);
                     if (configFileExistenceInfo && configFileExistenceInfo.openFilesImpactedByConfigFile.has(info.path)) {
                         ts.Debug.assert(info.isScriptOpen());
-                        // Info is not root of inferred project any more
                         configFileExistenceInfo.openFilesImpactedByConfigFile.set(info.path, false);
-                        _this.logConfigFileWatchUpdate(configFileName, canonicalConfigFilePath, configFileExistenceInfo, "Open file was set as not inferred root" /* RootOfInferredProjectFalse */);
-                        // Close the config file watcher
+                        _this.logConfigFileWatchUpdate(configFileName, canonicalConfigFilePath, configFileExistenceInfo, "Open file was set as not inferred root");
                         _this.closeConfigFileWatcherOfConfigFileExistenceInfo(configFileExistenceInfo);
                     }
                 });
             };
-            /**
-             * This function tries to search for a tsconfig.json for the given file.
-             * This is different from the method the compiler uses because
-             * the compiler can assume it will always start searching in the
-             * current directory (the directory in which tsc was invoked).
-             * The server must start searching from the directory containing
-             * the newly opened file.
-             */
             ProjectService.prototype.forEachConfigFileLocation = function (info, action) {
                 var _this = this;
                 if (this.syntaxOnly) {
@@ -113567,7 +114452,6 @@ var ts;
                 var projectRootPath = this.openFiles.get(info.path);
                 var searchPath = server.asNormalizedPath(ts.getDirectoryPath(info.fileName));
                 var isSearchPathInProjectRoot = function () { return ts.containsPath(projectRootPath, searchPath, _this.currentDirectory, !_this.host.useCaseSensitiveFileNames); };
-                // If projectRootPath doesnt contain info.path, then do normal search for config file
                 var anySearchPathOk = !projectRootPath || !isSearchPathInProjectRoot();
                 do {
                     var canonicalSearchPath = server.normalizedPathToPath(searchPath, this.currentDirectory, this.toCanonicalFileName);
@@ -113589,14 +114473,6 @@ var ts;
                 } while (anySearchPathOk || isSearchPathInProjectRoot());
                 return undefined;
             };
-            /**
-             * This function tries to search for a tsconfig.json for the given file.
-             * This is different from the method the compiler uses because
-             * the compiler can assume it will always start searching in the
-             * current directory (the directory in which tsc was invoked).
-             * The server must start searching from the directory containing
-             * the newly opened file.
-             */
             ProjectService.prototype.getConfigFileNameForFile = function (info) {
                 var _this = this;
                 ts.Debug.assert(info.isScriptOpen());
@@ -113644,7 +114520,6 @@ var ts;
                 this.logger.endGroup();
             };
             ProjectService.prototype.findConfiguredProjectByProjectName = function (configFileName) {
-                // make sure that casing of config file name is consistent
                 var canonicalConfigFilePath = server.asNormalizedPath(this.toCanonicalFileName(configFileName));
                 return this.getConfiguredProjectByCanonicalConfigFilePath(canonicalConfigFilePath);
             };
@@ -113656,15 +114531,13 @@ var ts;
             };
             ProjectService.prototype.convertConfigFileContentToProjectOptions = function (configFilename, cachedDirectoryStructureHost) {
                 configFilename = ts.normalizePath(configFilename);
-                var configFileContent = this.host.readFile(configFilename); // TODO: GH#18217
+                var configFileContent = this.host.readFile(configFilename);
                 var result = ts.parseJsonText(configFilename, configFileContent);
                 if (!result.endOfFileToken) {
-                    result.endOfFileToken = { kind: 1 /* EndOfFileToken */ };
+                    result.endOfFileToken = { kind: 1 };
                 }
                 var errors = result.parseDiagnostics;
-                var parsedCommandLine = ts.parseJsonSourceFileConfigFileContent(result, cachedDirectoryStructureHost, ts.getDirectoryPath(configFilename), 
-                /*existingOptions*/ {}, configFilename, 
-                /*resolutionStack*/ [], this.hostConfiguration.extraFileExtensions);
+                var parsedCommandLine = ts.parseJsonSourceFileConfigFileContent(result, cachedDirectoryStructureHost, ts.getDirectoryPath(configFilename), {}, configFilename, [], this.hostConfiguration.extraFileExtensions);
                 if (parsedCommandLine.errors.length) {
                     errors.push.apply(errors, parsedCommandLine.errors);
                 }
@@ -113683,7 +114556,6 @@ var ts;
                 };
                 return { projectOptions: projectOptions, configFileErrors: errors, configFileSpecs: parsedCommandLine.configFileSpecs };
             };
-            /** Get a filename if the language service exceeds the maximum allowed program size; otherwise returns undefined. */
             ProjectService.prototype.getFilenameForExceededTotalSizeLimitForNonTsFiles = function (name, options, fileNames, propertyReader) {
                 if (options && options.disableSizeLimit || !this.host.getFileSize) {
                     return;
@@ -113692,8 +114564,8 @@ var ts;
                 this.projectToSizeMap.set(name, 0);
                 this.projectToSizeMap.forEach(function (val) { return (availableSpace -= (val || 0)); });
                 var totalNonTsFileSize = 0;
-                for (var _i = 0, fileNames_2 = fileNames; _i < fileNames_2.length; _i++) {
-                    var f = fileNames_2[_i];
+                for (var _i = 0, fileNames_1 = fileNames; _i < fileNames_1.length; _i++) {
+                    var f = fileNames_1[_i];
                     var fileName = propertyReader.getFileName(f);
                     if (ts.hasTypeScriptFileExtension(fileName)) {
                         continue;
@@ -113701,7 +114573,6 @@ var ts;
                     totalNonTsFileSize += this.host.getFileSize(fileName);
                     if (totalNonTsFileSize > server.maxProgramSizeForNonTsFiles || totalNonTsFileSize > availableSpace) {
                         this.logger.info(getExceedLimitMessage({ propertyReader: propertyReader, hasTypeScriptFileExtension: ts.hasTypeScriptFileExtension, host: this.host }, totalNonTsFileSize));
-                        // Keep the size as zero since it's disabled
                         return fileName;
                     }
                 }
@@ -113715,15 +114586,14 @@ var ts;
                     var propertyReader = _a.propertyReader, hasTypeScriptFileExtension = _a.hasTypeScriptFileExtension, host = _a.host;
                     return fileNames.map(function (f) { return propertyReader.getFileName(f); })
                         .filter(function (name) { return hasTypeScriptFileExtension(name); })
-                        .map(function (name) { return ({ name: name, size: host.getFileSize(name) }); }) // TODO: GH#18217
+                        .map(function (name) { return ({ name: name, size: host.getFileSize(name) }); })
                         .sort(function (a, b) { return b.size - a.size; })
                         .slice(0, 5);
                 }
             };
             ProjectService.prototype.createExternalProject = function (projectFileName, files, options, typeAcquisition, excludedFiles) {
                 var compilerOptions = convertCompilerOptions(options);
-                var project = new server.ExternalProject(projectFileName, this, this.documentRegistry, compilerOptions, 
-                /*lastFileExceededProgramSize*/ this.getFilenameForExceededTotalSizeLimitForNonTsFiles(projectFileName, compilerOptions, files, externalFilePropertyReader), options.compileOnSave === undefined ? true : options.compileOnSave);
+                var project = new server.ExternalProject(projectFileName, this, this.documentRegistry, compilerOptions, this.getFilenameForExceededTotalSizeLimitForNonTsFiles(projectFileName, compilerOptions, files, externalFilePropertyReader), options.compileOnSave === undefined ? true : options.compileOnSave);
                 project.excludedFiles = excludedFiles;
                 this.addFilesToNonInferredProjectAndUpdateGraph(project, files, externalFilePropertyReader, typeAcquisition);
                 this.externalProjects.push(project);
@@ -113758,7 +114628,7 @@ var ts;
                     if (!(project instanceof server.ConfiguredProject)) {
                         return "other";
                     }
-                    var configFilePath = project instanceof server.ConfiguredProject ? project.getConfigFilePath() : undefined; // TODO: GH#18217
+                    var configFilePath = project instanceof server.ConfiguredProject ? project.getConfigFilePath() : undefined;
                     return server.getBaseConfigFileName(configFilePath) || "other";
                 }
                 function convertTypeAcquisition(_a) {
@@ -113773,26 +114643,23 @@ var ts;
             ProjectService.prototype.addFilesToNonInferredProjectAndUpdateGraph = function (project, files, propertyReader, typeAcquisition) {
                 this.updateNonInferredProjectFiles(project, files, propertyReader);
                 project.setTypeAcquisition(typeAcquisition);
-                // This doesnt need scheduling since its either creation or reload of the project
                 project.updateGraph();
             };
             ProjectService.prototype.createConfiguredProject = function (configFileName) {
                 var _this = this;
-                var cachedDirectoryStructureHost = ts.createCachedDirectoryStructureHost(this.host, this.host.getCurrentDirectory(), this.host.useCaseSensitiveFileNames); // TODO: GH#18217
+                var cachedDirectoryStructureHost = ts.createCachedDirectoryStructureHost(this.host, this.host.getCurrentDirectory(), this.host.useCaseSensitiveFileNames);
                 var _a = this.convertConfigFileContentToProjectOptions(configFileName, cachedDirectoryStructureHost), projectOptions = _a.projectOptions, configFileErrors = _a.configFileErrors, configFileSpecs = _a.configFileSpecs;
                 this.logger.info("Opened configuration file " + configFileName);
-                var lastFileExceededProgramSize = this.getFilenameForExceededTotalSizeLimitForNonTsFiles(configFileName, projectOptions.compilerOptions, projectOptions.files, fileNamePropertyReader); // TODO: GH#18217
-                var project = new server.ConfiguredProject(configFileName, this, this.documentRegistry, projectOptions.configHasFilesProperty, projectOptions.compilerOptions, // TODO: GH#18217
-                lastFileExceededProgramSize, projectOptions.compileOnSave === undefined ? false : projectOptions.compileOnSave, cachedDirectoryStructureHost, projectOptions.projectReferences);
+                var lastFileExceededProgramSize = this.getFilenameForExceededTotalSizeLimitForNonTsFiles(configFileName, projectOptions.compilerOptions, projectOptions.files, fileNamePropertyReader);
+                var project = new server.ConfiguredProject(configFileName, this, this.documentRegistry, projectOptions.configHasFilesProperty, projectOptions.compilerOptions, lastFileExceededProgramSize, projectOptions.compileOnSave === undefined ? false : projectOptions.compileOnSave, cachedDirectoryStructureHost, projectOptions.projectReferences);
                 project.configFileSpecs = configFileSpecs;
-                // TODO: We probably should also watch the configFiles that are extended
-                project.configFileWatcher = this.watchFactory.watchFile(this.host, configFileName, function (_fileName, eventKind) { return _this.onConfigChangedForConfiguredProject(project, eventKind); }, ts.PollingInterval.High, "Config file for the program" /* ConfigFilePath */, project);
+                project.configFileWatcher = this.watchFactory.watchFile(this.host, configFileName, function (_fileName, eventKind) { return _this.onConfigChangedForConfiguredProject(project, eventKind); }, ts.PollingInterval.High, "Config file for the program", project);
                 if (!lastFileExceededProgramSize) {
-                    project.watchWildcards(projectOptions.wildcardDirectories); // TODO: GH#18217
+                    project.watchWildcards(projectOptions.wildcardDirectories);
                 }
                 project.setProjectErrors(configFileErrors);
                 var filesToAdd = projectOptions.files.concat(project.getExternalFiles());
-                this.addFilesToNonInferredProjectAndUpdateGraph(project, filesToAdd, fileNamePropertyReader, projectOptions.typeAcquisition); // TODO: GH#18217
+                this.addFilesToNonInferredProjectAndUpdateGraph(project, filesToAdd, fileNamePropertyReader, projectOptions.typeAcquisition);
                 this.configuredProjects.set(project.canonicalConfigFilePath, project);
                 this.setConfigFileExistenceByNewConfiguredProject(project);
                 this.sendProjectTelemetry(configFileName, project, projectOptions);
@@ -113801,19 +114668,18 @@ var ts;
             ProjectService.prototype.updateNonInferredProjectFiles = function (project, files, propertyReader) {
                 var projectRootFilesMap = project.getRootFilesMap();
                 var newRootScriptInfoMap = ts.createMap();
-                for (var _i = 0, files_4 = files; _i < files_4.length; _i++) {
-                    var f = files_4[_i];
+                for (var _i = 0, files_1 = files; _i < files_1.length; _i++) {
+                    var f = files_1[_i];
                     var newRootFile = propertyReader.getFileName(f);
                     var normalizedPath = server.toNormalizedPath(newRootFile);
                     var isDynamic = server.isDynamicFileName(normalizedPath);
                     var scriptInfo = void 0;
                     var path = void 0;
-                    // Use the project's fileExists so that it can use caching instead of reaching to disk for the query
                     if (!isDynamic && !project.fileExists(newRootFile)) {
                         path = server.normalizedPathToPath(normalizedPath, this.currentDirectory, this.toCanonicalFileName);
                         var existingValue = projectRootFilesMap.get(path);
                         if (server.isScriptInfo(existingValue)) {
-                            project.removeFile(existingValue, /*fileExists*/ false, /*detachFromProject*/ true);
+                            project.removeFile(existingValue, false, true);
                         }
                         projectRootFilesMap.set(path, normalizedPath);
                         scriptInfo = normalizedPath;
@@ -113821,27 +114687,22 @@ var ts;
                     else {
                         var scriptKind = propertyReader.getScriptKind(f, this.hostConfiguration.extraFileExtensions);
                         var hasMixedContent = propertyReader.hasMixedContent(f, this.hostConfiguration.extraFileExtensions);
-                        scriptInfo = this.getOrCreateScriptInfoNotOpenedByClientForNormalizedPath(normalizedPath, project.currentDirectory, scriptKind, hasMixedContent, project.directoryStructureHost); // TODO: GH#18217
+                        scriptInfo = this.getOrCreateScriptInfoNotOpenedByClientForNormalizedPath(normalizedPath, project.currentDirectory, scriptKind, hasMixedContent, project.directoryStructureHost);
                         path = scriptInfo.path;
-                        // If this script info is not already a root add it
                         if (!project.isRoot(scriptInfo)) {
                             project.addRoot(scriptInfo);
                             if (scriptInfo.isScriptOpen()) {
-                                // if file is already root in some inferred project
-                                // - remove the file from that project and delete the project if necessary
                                 this.removeRootOfInferredProjectIfNowPartOfOtherProject(scriptInfo);
                             }
                         }
                     }
                     newRootScriptInfoMap.set(path, scriptInfo);
                 }
-                // project's root file map size is always going to be same or larger than new roots map
-                // as we have already all the new files to the project
                 if (projectRootFilesMap.size > newRootScriptInfoMap.size) {
                     projectRootFilesMap.forEach(function (value, path) {
                         if (!newRootScriptInfoMap.has(path)) {
                             if (server.isScriptInfo(value)) {
-                                project.removeFile(value, project.fileExists(path), /*detachFromProject*/ true);
+                                project.removeFile(value, project.fileExists(path), true);
                             }
                             else {
                                 projectRootFilesMap.delete(path);
@@ -113849,58 +114710,42 @@ var ts;
                         }
                     });
                 }
-                // Just to ensure that even if root files dont change, the changes to the non root file are picked up,
-                // mark the project as dirty unconditionally
                 project.markAsDirty();
             };
             ProjectService.prototype.updateNonInferredProject = function (project, newUncheckedFiles, propertyReader, newOptions, newTypeAcquisition, compileOnSave) {
                 project.setCompilerOptions(newOptions);
-                // VS only set the CompileOnSaveEnabled option in the request if the option was changed recently
-                // therefore if it is undefined, it should not be updated.
                 if (compileOnSave !== undefined) {
                     project.compileOnSaveEnabled = compileOnSave;
                 }
                 this.addFilesToNonInferredProjectAndUpdateGraph(project, newUncheckedFiles, propertyReader, newTypeAcquisition);
             };
-            /**
-             * Reload the file names from config file specs and update the project graph
-             */
-            /*@internal*/
             ProjectService.prototype.reloadFileNamesOfConfiguredProject = function (project) {
-                var configFileSpecs = project.configFileSpecs; // TODO: GH#18217
+                var configFileSpecs = project.configFileSpecs;
                 var configFileName = project.getConfigFilePath();
                 var fileNamesResult = ts.getFileNamesFromConfigSpecs(configFileSpecs, ts.getDirectoryPath(configFileName), project.getCompilationSettings(), project.getCachedDirectoryStructureHost(), this.hostConfiguration.extraFileExtensions);
                 project.updateErrorOnNoInputFiles(fileNamesResult.fileNames.length !== 0);
                 this.updateNonInferredProjectFiles(project, fileNamesResult.fileNames, fileNamePropertyReader);
                 return project.updateGraph();
             };
-            /**
-             * Read the config file of the project again and update the project
-             */
-            /* @internal */
             ProjectService.prototype.reloadConfiguredProject = function (project) {
-                // At this point, there is no reason to not have configFile in the host
                 var host = project.getCachedDirectoryStructureHost();
-                // Clear the cache since we are reloading the project from disk
                 host.clearCache();
                 var configFileName = project.getConfigFilePath();
                 this.logger.info("Reloading configured project " + configFileName);
-                // Read updated contents from disk
                 var _a = this.convertConfigFileContentToProjectOptions(configFileName, host), projectOptions = _a.projectOptions, configFileErrors = _a.configFileErrors, configFileSpecs = _a.configFileSpecs;
-                // Update the project
                 project.configFileSpecs = configFileSpecs;
                 project.setProjectErrors(configFileErrors);
                 project.updateReferences(projectOptions.projectReferences);
-                var lastFileExceededProgramSize = this.getFilenameForExceededTotalSizeLimitForNonTsFiles(project.canonicalConfigFilePath, projectOptions.compilerOptions, projectOptions.files, fileNamePropertyReader); // TODO: GH#18217
+                var lastFileExceededProgramSize = this.getFilenameForExceededTotalSizeLimitForNonTsFiles(project.canonicalConfigFilePath, projectOptions.compilerOptions, projectOptions.files, fileNamePropertyReader);
                 if (lastFileExceededProgramSize) {
                     project.disableLanguageService(lastFileExceededProgramSize);
                     project.stopWatchingWildCards();
                 }
                 else {
                     project.enableLanguageService();
-                    project.watchWildcards(projectOptions.wildcardDirectories); // TODO: GH#18217
+                    project.watchWildcards(projectOptions.wildcardDirectories);
                 }
-                this.updateNonInferredProject(project, projectOptions.files, fileNamePropertyReader, projectOptions.compilerOptions, projectOptions.typeAcquisition, projectOptions.compileOnSave); // TODO: GH#18217
+                this.updateNonInferredProject(project, projectOptions.files, fileNamePropertyReader, projectOptions.compilerOptions, projectOptions.typeAcquisition, projectOptions.compileOnSave);
                 this.sendConfigFileDiagEvent(project, configFileName);
             };
             ProjectService.prototype.sendConfigFileDiagEvent = function (project, triggerFile) {
@@ -113918,28 +114763,21 @@ var ts;
                 }
                 if (projectRootPath) {
                     var canonicalProjectRootPath = this.toCanonicalFileName(projectRootPath);
-                    // if we have an explicit project root path, find (or create) the matching inferred project.
                     for (var _i = 0, _a = this.inferredProjects; _i < _a.length; _i++) {
                         var project = _a[_i];
                         if (project.projectRootPath === canonicalProjectRootPath) {
                             return project;
                         }
                     }
-                    return this.createInferredProject(projectRootPath, /*isSingleInferredProject*/ false, projectRootPath);
+                    return this.createInferredProject(projectRootPath, false, projectRootPath);
                 }
-                // we don't have an explicit root path, so we should try to find an inferred project
-                // that more closely contains the file.
                 var bestMatch;
                 for (var _b = 0, _c = this.inferredProjects; _b < _c.length; _b++) {
                     var project = _c[_b];
-                    // ignore single inferred projects (handled elsewhere)
                     if (!project.projectRootPath)
                         continue;
-                    // ignore inferred projects that don't contain the root's path
                     if (!ts.containsPath(project.projectRootPath, info.path, this.host.getCurrentDirectory(), !this.host.useCaseSensitiveFileNames))
                         continue;
-                    // ignore inferred projects that are higher up in the project root.
-                    // TODO(rbuckton): Should we add the file as a root to these as well?
                     if (bestMatch && bestMatch.projectRootPath.length > project.projectRootPath.length)
                         continue;
                     bestMatch = project;
@@ -113950,24 +114788,14 @@ var ts;
                 if (!this.useSingleInferredProject) {
                     return undefined;
                 }
-                // If `useInferredProjectPerProjectRoot` is not enabled, then there will only be one
-                // inferred project for all files. If `useInferredProjectPerProjectRoot` is enabled
-                // then we want to put all files that are not opened with a `projectRootPath` into
-                // the same inferred project.
-                //
-                // To avoid the cost of searching through the array and to optimize for the case where
-                // `useInferredProjectPerProjectRoot` is not enabled, we will always put the inferred
-                // project for non-rooted files at the front of the array.
                 if (this.inferredProjects.length > 0 && this.inferredProjects[0].projectRootPath === undefined) {
                     return this.inferredProjects[0];
                 }
-                // Single inferred project does not have a project root and hence no current directory
-                return this.createInferredProject(/*currentDirectory*/ undefined, /*isSingleInferredProject*/ true);
+                return this.createInferredProject(undefined, true);
             };
             ProjectService.prototype.getOrCreateSingleInferredWithoutProjectRoot = function (currentDirectory) {
                 ts.Debug.assert(!this.useSingleInferredProject);
                 var expectedCurrentDirectory = this.toCanonicalFileName(this.getNormalizedAbsolutePath(currentDirectory || ""));
-                // Reuse the project with same current directory but no roots
                 for (var _i = 0, _a = this.inferredProjects; _i < _a.length; _i++) {
                     var inferredProject = _a[_i];
                     if (!inferredProject.projectRootPath &&
@@ -113989,19 +114817,12 @@ var ts;
                 }
                 return project;
             };
-            /*@internal*/
             ProjectService.prototype.getOrCreateScriptInfoNotOpenedByClient = function (uncheckedFileName, currentDirectory, hostToQueryFileExistsOn) {
-                return this.getOrCreateScriptInfoNotOpenedByClientForNormalizedPath(server.toNormalizedPath(uncheckedFileName), currentDirectory, /*scriptKind*/ undefined, 
-                /*hasMixedContent*/ undefined, hostToQueryFileExistsOn);
+                return this.getOrCreateScriptInfoNotOpenedByClientForNormalizedPath(server.toNormalizedPath(uncheckedFileName), currentDirectory, undefined, undefined, hostToQueryFileExistsOn);
             };
             ProjectService.prototype.getScriptInfo = function (uncheckedFileName) {
                 return this.getScriptInfoForNormalizedPath(server.toNormalizedPath(uncheckedFileName));
             };
-            /**
-             * Returns the projects that contain script info through SymLink
-             * Note that this does not return projects in info.containingProjects
-             */
-            /*@internal*/
             ProjectService.prototype.getSymlinkedProjects = function (info) {
                 var projects;
                 if (this.realpathToScriptInfos) {
@@ -114014,8 +114835,7 @@ var ts;
                 return projects;
                 function combineProjects(toAddInfo) {
                     if (toAddInfo !== info) {
-                        var _loop_28 = function (project) {
-                            // Add the projects only if they can use symLink targets and not already in the list
+                        var _loop_3 = function (project) {
                             if (project.languageServiceEnabled &&
                                 !project.isOrphan() &&
                                 !project.getCompilerOptions().preserveSymlinks &&
@@ -114031,7 +114851,7 @@ var ts;
                         };
                         for (var _i = 0, _a = toAddInfo.containingProjects; _i < _a.length; _i++) {
                             var project = _a[_i];
-                            _loop_28(project);
+                            _loop_3(project);
                         }
                     }
                 }
@@ -114039,13 +114859,11 @@ var ts;
             ProjectService.prototype.watchClosedScriptInfo = function (info) {
                 var _this = this;
                 ts.Debug.assert(!info.fileWatcher);
-                // do not watch files with mixed content - server doesn't know how to interpret it
-                // do not watch files in the global cache location
                 if (!info.isDynamicOrHasMixedContent() &&
                     (!this.globalCacheLocationDirectoryPath ||
                         !ts.startsWith(info.path, this.globalCacheLocationDirectoryPath))) {
                     var fileName = info.fileName;
-                    info.fileWatcher = this.watchFactory.watchFilePath(this.host, fileName, function (fileName, eventKind, path) { return _this.onSourceFileChanged(fileName, eventKind, path); }, ts.PollingInterval.Medium, info.path, "Closed Script info" /* ClosedScriptInfo */);
+                    info.fileWatcher = this.watchFactory.watchFilePath(this.host, fileName, function (fileName, eventKind, path) { return _this.onSourceFileChanged(fileName, eventKind, path); }, ts.PollingInterval.Medium, info.path, "Closed Script info");
                 }
             };
             ProjectService.prototype.stopWatchingScriptInfo = function (info) {
@@ -114054,13 +114872,11 @@ var ts;
                     info.fileWatcher = undefined;
                 }
             };
-            /*@internal*/
             ProjectService.prototype.getOrCreateScriptInfoNotOpenedByClientForNormalizedPath = function (fileName, currentDirectory, scriptKind, hasMixedContent, hostToQueryFileExistsOn) {
-                return this.getOrCreateScriptInfoWorker(fileName, currentDirectory, /*openedByClient*/ false, /*fileContent*/ undefined, scriptKind, hasMixedContent, hostToQueryFileExistsOn);
+                return this.getOrCreateScriptInfoWorker(fileName, currentDirectory, false, undefined, scriptKind, hasMixedContent, hostToQueryFileExistsOn);
             };
-            /*@internal*/
             ProjectService.prototype.getOrCreateScriptInfoOpenedByClientForNormalizedPath = function (fileName, currentDirectory, fileContent, scriptKind, hasMixedContent) {
-                return this.getOrCreateScriptInfoWorker(fileName, currentDirectory, /*openedByClient*/ true, fileContent, scriptKind, hasMixedContent);
+                return this.getOrCreateScriptInfoWorker(fileName, currentDirectory, true, fileContent, scriptKind, hasMixedContent);
             };
             ProjectService.prototype.getOrCreateScriptInfoForNormalizedPath = function (fileName, openedByClient, fileContent, scriptKind, hasMixedContent, hostToQueryFileExistsOn) {
                 return this.getOrCreateScriptInfoWorker(fileName, this.currentDirectory, openedByClient, fileContent, scriptKind, hasMixedContent, hostToQueryFileExistsOn);
@@ -114075,23 +114891,19 @@ var ts;
                     ts.Debug.assert(ts.isRootedDiskPath(fileName) || isDynamic || openedByClient, "", function () { return JSON.stringify({ fileName: fileName, currentDirectory: currentDirectory, hostCurrentDirectory: _this.currentDirectory, openKeys: ts.arrayFrom(_this.openFilesWithNonRootedDiskPath.keys()) }) + "\nScript info with non-dynamic relative file name can only be open script info"; });
                     ts.Debug.assert(!ts.isRootedDiskPath(fileName) || this.currentDirectory === currentDirectory || !this.openFilesWithNonRootedDiskPath.has(this.toCanonicalFileName(fileName)), "", function () { return JSON.stringify({ fileName: fileName, currentDirectory: currentDirectory, hostCurrentDirectory: _this.currentDirectory, openKeys: ts.arrayFrom(_this.openFilesWithNonRootedDiskPath.keys()) }) + "\nOpen script files with non rooted disk path opened with current directory context cannot have same canonical names"; });
                     ts.Debug.assert(!isDynamic || this.currentDirectory === currentDirectory, "", function () { return JSON.stringify({ fileName: fileName, currentDirectory: currentDirectory, hostCurrentDirectory: _this.currentDirectory, openKeys: ts.arrayFrom(_this.openFilesWithNonRootedDiskPath.keys()) }) + "\nDynamic files must always have current directory context since containing external project name will always match the script info name."; });
-                    // If the file is not opened by client and the file doesnot exist on the disk, return
                     if (!openedByClient && !isDynamic && !(hostToQueryFileExistsOn || this.host).fileExists(fileName)) {
                         return;
                     }
-                    info = new server.ScriptInfo(this.host, fileName, scriptKind, !!hasMixedContent, path); // TODO: GH#18217
+                    info = new server.ScriptInfo(this.host, fileName, scriptKind, !!hasMixedContent, path);
                     this.filenameToScriptInfo.set(info.path, info);
                     if (!openedByClient) {
                         this.watchClosedScriptInfo(info);
                     }
                     else if (!ts.isRootedDiskPath(fileName) && currentDirectory !== this.currentDirectory) {
-                        // File that is opened by user but isn't rooted disk path
                         this.openFilesWithNonRootedDiskPath.set(this.toCanonicalFileName(fileName), info);
                     }
                 }
                 if (openedByClient && !info.isScriptOpen()) {
-                    // Opening closed script info
-                    // either it was created just now, or was part of projects but was closed
                     this.stopWatchingScriptInfo(info);
                     info.open(fileContent);
                     if (hasMixedContent) {
@@ -114103,9 +114915,6 @@ var ts;
                 }
                 return info;
             };
-            /**
-             * This gets the script info for the normalized path. If the path is not rooted disk path then the open script info with project root context is preferred
-             */
             ProjectService.prototype.getScriptInfoForNormalizedPath = function (fileName) {
                 return !ts.isRootedDiskPath(fileName) && this.openFilesWithNonRootedDiskPath.get(this.toCanonicalFileName(fileName)) ||
                     this.getScriptInfoForPath(server.normalizedPathToPath(fileName, this.currentDirectory, this.toCanonicalFileName));
@@ -114135,8 +114944,6 @@ var ts;
                     }
                     if (args.extraFileExtensions) {
                         this.hostConfiguration.extraFileExtensions = args.extraFileExtensions;
-                        // We need to update the project structures again as it is possible that existing
-                        // project structure could have more or less files depending on extensions permitted
                         this.reloadProjects();
                         this.logger.info("Host file extension mappings updated");
                     }
@@ -114145,51 +114952,26 @@ var ts;
             ProjectService.prototype.closeLog = function () {
                 this.logger.close();
             };
-            /**
-             * This function rebuilds the project for every file opened by the client
-             * This does not reload contents of open files from disk. But we could do that if needed
-             */
             ProjectService.prototype.reloadProjects = function () {
                 this.logger.info("reload projects.");
-                // If we want this to also reload open files from disk, we could do that,
-                // but then we need to make sure we arent calling this function
-                // (and would separate out below reloading of projects to be called when immediate reload is needed)
-                // as there is no need to load contents of the files from the disk
-                // Reload Projects
-                this.reloadConfiguredProjectForFiles(this.openFiles, /*delayReload*/ false, ts.returnTrue);
+                this.reloadConfiguredProjectForFiles(this.openFiles, false, ts.returnTrue);
                 this.ensureProjectForOpenFiles();
             };
             ProjectService.prototype.delayReloadConfiguredProjectForFiles = function (configFileExistenceInfo, ignoreIfNotRootOfInferredProject) {
-                // Get open files to reload projects for
-                this.reloadConfiguredProjectForFiles(configFileExistenceInfo.openFilesImpactedByConfigFile, 
-                /*delayReload*/ true, ignoreIfNotRootOfInferredProject ?
-                    function (isRootOfInferredProject) { return isRootOfInferredProject; } : // Reload open files if they are root of inferred project
-                    ts.returnTrue // Reload all the open files impacted by config file
-                );
+                this.reloadConfiguredProjectForFiles(configFileExistenceInfo.openFilesImpactedByConfigFile, true, ignoreIfNotRootOfInferredProject ?
+                    function (isRootOfInferredProject) { return isRootOfInferredProject; } :
+                    ts.returnTrue);
                 this.delayEnsureProjectForOpenFiles();
             };
-            /**
-             * This function goes through all the openFiles and tries to file the config file for them.
-             * If the config file is found and it refers to existing project, it reloads it either immediately
-             * or schedules it for reload depending on delayReload option
-             * If the there is no existing project it just opens the configured project for the config file
-             * reloadForInfo provides a way to filter out files to reload configured project for
-             */
             ProjectService.prototype.reloadConfiguredProjectForFiles = function (openFiles, delayReload, shouldReloadProjectFor) {
                 var _this = this;
                 var updatedProjects = ts.createMap();
-                // try to reload config file for all open files
                 openFiles.forEach(function (openFileValue, path) {
-                    // Filter out the files that need to be ignored
                     if (!shouldReloadProjectFor(openFileValue)) {
                         return;
                     }
-                    var info = _this.getScriptInfoForPath(path); // TODO: GH#18217
+                    var info = _this.getScriptInfoForPath(path);
                     ts.Debug.assert(info.isScriptOpen());
-                    // This tries to search for a tsconfig.json for the given file. If we found it,
-                    // we first detect if there is already a configured project created for it: if so,
-                    // we re- read the tsconfig file content and update the project only if we havent already done so
-                    // otherwise we create a new one.
                     var configFileName = _this.getConfigFileNameForFile(info);
                     if (configFileName) {
                         var project = _this.findConfiguredProjectByProjectName(configFileName);
@@ -114210,51 +114992,26 @@ var ts;
                     }
                 });
             };
-            /**
-             * Remove the root of inferred project if script info is part of another project
-             */
             ProjectService.prototype.removeRootOfInferredProjectIfNowPartOfOtherProject = function (info) {
-                // If the script info is root of inferred project, it could only be first containing project
-                // since info is added as root to the inferred project only when there are no other projects containing it
-                // So when it is root of the inferred project and after project structure updates its now part
-                // of multiple project it needs to be removed from that inferred project because:
-                // - references in inferred project supercede the root part
-                // - root / reference in non - inferred project beats root in inferred project
-                // eg. say this is structure /a/b/a.ts /a/b/c.ts where c.ts references a.ts
-                // When a.ts is opened, since there is no configured project/external project a.ts can be part of
-                // a.ts is added as root to inferred project.
-                // Now at time of opening c.ts, c.ts is also not aprt of any existing project,
-                // so it will be added to inferred project as a root. (for sake of this example assume single inferred project is false)
-                // So at this poing a.ts is part of first inferred project and second inferred project (of which c.ts is root)
-                // And hence it needs to be removed from the first inferred project.
                 ts.Debug.assert(info.containingProjects.length > 0);
                 var firstProject = info.containingProjects[0];
                 if (!firstProject.isOrphan() &&
                     firstProject.projectKind === server.ProjectKind.Inferred &&
                     firstProject.isRoot(info) &&
                     ts.forEach(info.containingProjects, function (p) { return p !== firstProject && !p.isOrphan(); })) {
-                    firstProject.removeFile(info, /*fileExists*/ true, /*detachFromProject*/ true);
+                    firstProject.removeFile(info, true, true);
                 }
             };
-            /**
-             * This function is to update the project structure for every inferred project.
-             * It is called on the premise that all the configured projects are
-             * up to date.
-             * This will go through open files and assign them to inferred project if open file is not part of any other project
-             * After that all the inferred project graphs are updated
-             */
             ProjectService.prototype.ensureProjectForOpenFiles = function () {
                 var _this = this;
                 this.logger.info("Structure before ensureProjectForOpenFiles:");
                 this.printProjects();
                 this.openFiles.forEach(function (projectRootPath, path) {
                     var info = _this.getScriptInfoForPath(path);
-                    // collect all orphaned script infos from open files
                     if (info.isOrphan()) {
                         _this.assignOrphanScriptInfoToInferredProject(info, projectRootPath);
                     }
                     else {
-                        // Or remove the root of inferred project if is referenced in more than one projects
                         _this.removeRootOfInferredProjectIfNowPartOfOtherProject(info);
                     }
                 });
@@ -114263,17 +115020,11 @@ var ts;
                 this.logger.info("Structure after ensureProjectForOpenFiles:");
                 this.printProjects();
             };
-            /**
-             * Open file whose contents is managed by the client
-             * @param filename is absolute pathname
-             * @param fileContent is a known version of the file content that is more up to date than the one on disk
-             */
             ProjectService.prototype.openClientFile = function (fileName, fileContent, scriptKind, projectRootPath) {
-                return this.openClientFileWithNormalizedPath(server.toNormalizedPath(fileName), fileContent, scriptKind, /*hasMixedContent*/ false, projectRootPath ? server.toNormalizedPath(projectRootPath) : undefined);
+                return this.openClientFileWithNormalizedPath(server.toNormalizedPath(fileName), fileContent, scriptKind, false, projectRootPath ? server.toNormalizedPath(projectRootPath) : undefined);
             };
             ProjectService.prototype.findExternalProjectContainingOpenScriptInfo = function (info) {
                 return ts.find(this.externalProjects, function (proj) {
-                    // Ensure project structure is up-to-date to check if info is present in external project
                     proj.updateGraph();
                     return proj.containsScriptInfo(info);
                 });
@@ -114282,18 +115033,16 @@ var ts;
                 var _this = this;
                 var configFileName;
                 var configFileErrors;
-                var info = this.getOrCreateScriptInfoOpenedByClientForNormalizedPath(fileName, projectRootPath ? this.getNormalizedAbsolutePath(projectRootPath) : this.currentDirectory, fileContent, scriptKind, hasMixedContent); // TODO: GH#18217
+                var info = this.getOrCreateScriptInfoOpenedByClientForNormalizedPath(fileName, projectRootPath ? this.getNormalizedAbsolutePath(projectRootPath) : this.currentDirectory, fileContent, scriptKind, hasMixedContent);
                 this.openFiles.set(info.path, projectRootPath);
                 var project = this.findExternalProjectContainingOpenScriptInfo(info);
-                if (!project && !this.syntaxOnly) { // Checking syntaxOnly is an optimization
+                if (!project && !this.syntaxOnly) {
                     configFileName = this.getConfigFileNameForFile(info);
                     if (configFileName) {
                         project = this.findConfiguredProjectByProjectName(configFileName);
                         if (!project) {
                             project = this.createConfiguredProject(configFileName);
-                            // Send the event only if the project got created as part of this open request and info is part of the project
                             if (info.isOrphan()) {
-                                // Since the file isnt part of configured project, do not send config file info
                                 configFileName = undefined;
                             }
                             else {
@@ -114302,47 +115051,28 @@ var ts;
                             }
                         }
                         else {
-                            // Ensure project is ready to check if it contains opened script info
                             updateProjectIfDirty(project);
                         }
                     }
                 }
-                // Project we have at this point is going to be updated since its either found through
-                // - external project search, which updates the project before checking if info is present in it
-                // - configured project - either created or updated to ensure we know correct status of info
-                // At this point we need to ensure that containing projects of the info are uptodate
-                // This will ensure that later question of info.isOrphan() will return correct answer
-                // and we correctly create inferred project for the info
                 info.containingProjects.forEach(updateProjectIfDirty);
-                // At this point if file is part of any any configured or external project, then it would be present in the containing projects
-                // So if it still doesnt have any containing projects, it needs to be part of inferred project
                 if (info.isOrphan()) {
                     this.assignOrphanScriptInfoToInferredProject(info, projectRootPath);
                 }
                 ts.Debug.assert(!info.isOrphan());
-                // Remove the configured projects that have zero references from open files.
-                // This was postponed from closeOpenFile to after opening next file,
-                // so that we can reuse the project if we need to right away
                 this.configuredProjects.forEach(function (project) {
                     if (!project.hasOpenRef()) {
                         _this.removeProject(project);
                     }
                 });
-                // Remove orphan inferred projects now that we have reused projects
-                // We need to create a duplicate because we cant guarantee order after removal
                 for (var _i = 0, _a = this.inferredProjects.slice(); _i < _a.length; _i++) {
                     var inferredProject = _a[_i];
                     if (inferredProject.isOrphan()) {
                         this.removeProject(inferredProject);
                     }
                 }
-                // Delete the orphan files here because there might be orphan script infos (which are not part of project)
-                // when some file/s were closed which resulted in project removal.
-                // It was then postponed to cleanup these script infos so that they can be reused if
-                // the file from that old project is reopened because of opening file from here.
                 this.filenameToScriptInfo.forEach(function (info) {
                     if (!info.isScriptOpen() && info.isOrphan()) {
-                        // if there are not projects that include this script info - delete it
                         _this.stopWatchingScriptInfo(info);
                         _this.deleteScriptInfo(info);
                     }
@@ -114358,10 +115088,6 @@ var ts;
                 var info = { checkJs: !!scriptInfo.getDefaultProject().getSourceFile(scriptInfo.path).checkJsDirective };
                 this.eventHandler({ eventName: server.OpenFileInfoTelemetryEvent, data: { info: info } });
             };
-            /**
-             * Close file whose contents is managed by the client
-             * @param filename is absolute pathname
-             */
             ProjectService.prototype.closeClientFile = function (uncheckedFileName) {
                 var info = this.getScriptInfoForNormalizedPath(server.toNormalizedPath(uncheckedFileName));
                 if (info) {
@@ -114370,16 +115096,15 @@ var ts;
                 this.printProjects();
             };
             ProjectService.prototype.collectChanges = function (lastKnownProjectVersions, currentProjects, result) {
-                var _loop_29 = function (proj) {
+                var _loop_4 = function (proj) {
                     var knownProject = ts.find(lastKnownProjectVersions, function (p) { return p.projectName === proj.getProjectName(); });
                     result.push(proj.getChangesSinceVersion(knownProject && knownProject.version));
                 };
                 for (var _i = 0, currentProjects_1 = currentProjects; _i < currentProjects_1.length; _i++) {
                     var proj = currentProjects_1[_i];
-                    _loop_29(proj);
+                    _loop_4(proj);
                 }
             };
-            /* @internal */
             ProjectService.prototype.synchronizeProjectList = function (knownProjects) {
                 var files = [];
                 this.collectChanges(knownProjects, this.externalProjects, files);
@@ -114387,35 +115112,32 @@ var ts;
                 this.collectChanges(knownProjects, this.inferredProjects, files);
                 return files;
             };
-            /* @internal */
             ProjectService.prototype.applyChangesInOpenFiles = function (openFiles, changedFiles, closedFiles) {
                 if (openFiles) {
                     for (var _i = 0, openFiles_1 = openFiles; _i < openFiles_1.length; _i++) {
-                        var file_21 = openFiles_1[_i];
-                        var scriptInfo = this.getScriptInfo(file_21.fileName);
+                        var file = openFiles_1[_i];
+                        var scriptInfo = this.getScriptInfo(file.fileName);
                         ts.Debug.assert(!scriptInfo || !scriptInfo.isScriptOpen(), "Script should not exist and not be open already");
-                        var normalizedPath = scriptInfo ? scriptInfo.fileName : server.toNormalizedPath(file_21.fileName);
-                        this.openClientFileWithNormalizedPath(normalizedPath, file_21.content, tryConvertScriptKindName(file_21.scriptKind), file_21.hasMixedContent); // TODO: GH#18217
+                        var normalizedPath = scriptInfo ? scriptInfo.fileName : server.toNormalizedPath(file.fileName);
+                        this.openClientFileWithNormalizedPath(normalizedPath, file.content, tryConvertScriptKindName(file.scriptKind), file.hasMixedContent);
                     }
                 }
                 if (changedFiles) {
                     for (var _a = 0, changedFiles_2 = changedFiles; _a < changedFiles_2.length; _a++) {
-                        var file_22 = changedFiles_2[_a];
-                        var scriptInfo = this.getScriptInfo(file_22.fileName);
+                        var file = changedFiles_2[_a];
+                        var scriptInfo = this.getScriptInfo(file.fileName);
                         ts.Debug.assert(!!scriptInfo);
-                        this.applyChangesToFile(scriptInfo, file_22.changes);
+                        this.applyChangesToFile(scriptInfo, file.changes);
                     }
                 }
                 if (closedFiles) {
                     for (var _b = 0, closedFiles_1 = closedFiles; _b < closedFiles_1.length; _b++) {
-                        var file_23 = closedFiles_1[_b];
-                        this.closeClientFile(file_23);
+                        var file = closedFiles_1[_b];
+                        this.closeClientFile(file);
                     }
                 }
             };
-            /* @internal */
             ProjectService.prototype.applyChangesToFile = function (scriptInfo, changes) {
-                // apply changes in reverse order
                 for (var i = changes.length - 1; i >= 0; i--) {
                     var change = changes[i];
                     scriptInfo.editContent(change.span.start, change.span.start + change.span.length, change.newText);
@@ -114442,7 +115164,6 @@ var ts;
                     this.externalProjectToConfiguredProjectMap.delete(fileName);
                 }
                 else {
-                    // close external project
                     var externalProject = this.findExternalProjectByProjectName(uncheckedFileName);
                     if (externalProject) {
                         this.removeProject(externalProject);
@@ -114451,7 +115172,6 @@ var ts;
             };
             ProjectService.prototype.openExternalProjects = function (projects) {
                 var _this = this;
-                // record project list before the update
                 var projectsToClose = ts.arrayToMap(this.externalProjects, function (p) { return p.getProjectName(); }, function (_) { return true; });
                 ts.forEachKey(this.externalProjectToConfiguredProjectMap, function (externalProjectName) {
                     projectsToClose.set(externalProjectName, true);
@@ -114459,10 +115179,8 @@ var ts;
                 for (var _i = 0, projects_4 = projects; _i < projects_4.length; _i++) {
                     var externalProject = projects_4[_i];
                     this.openExternalProject(externalProject);
-                    // delete project that is present in input list
                     projectsToClose.delete(externalProject.projectFileName);
                 }
-                // close projects that were missing in the input list
                 ts.forEachKey(projectsToClose, function (externalProjectName) {
                     _this.closeExternalProject(externalProjectName);
                 });
@@ -114478,7 +115196,6 @@ var ts;
                 var rootFiles = proj.rootFiles;
                 var typeAcquisition = proj.typeAcquisition;
                 ts.Debug.assert(!!typeAcquisition, "proj.typeAcquisition should be set by now");
-                // If type acquisition has been explicitly disabled, do not exclude anything from the project
                 if (typeAcquisition.enable === false) {
                     return [];
                 }
@@ -114486,38 +115203,31 @@ var ts;
                 var excludeRules = [];
                 var normalizedNames = rootFiles.map(function (f) { return ts.normalizeSlashes(f.fileName); });
                 var excludedFiles = [];
-                var _loop_30 = function (name) {
-                    var rule_2 = this_2.safelist[name];
+                var _loop_5 = function (name) {
+                    var rule = this_2.safelist[name];
                     for (var _i = 0, normalizedNames_1 = normalizedNames; _i < normalizedNames_1.length; _i++) {
                         var root = normalizedNames_1[_i];
-                        if (rule_2.match.test(root)) {
+                        if (rule.match.test(root)) {
                             this_2.logger.info("Excluding files based on rule " + name + " matching file '" + root + "'");
-                            // If the file matches, collect its types packages and exclude rules
-                            if (rule_2.types) {
-                                for (var _a = 0, _b = rule_2.types; _a < _b.length; _a++) {
+                            if (rule.types) {
+                                for (var _a = 0, _b = rule.types; _a < _b.length; _a++) {
                                     var type = _b[_a];
-                                    // Best-effort de-duping here - doesn't need to be unduplicated but
-                                    // we don't want the list to become a 400-element array of just 'kendo'
                                     if (typeAcqInclude.indexOf(type) < 0) {
                                         typeAcqInclude.push(type);
                                     }
                                 }
                             }
-                            if (rule_2.exclude) {
-                                var _loop_32 = function (exclude) {
-                                    var processedRule = root.replace(rule_2.match, function () {
+                            if (rule.exclude) {
+                                var _loop_7 = function (exclude) {
+                                    var processedRule = root.replace(rule.match, function () {
                                         var groups = [];
                                         for (var _i = 0; _i < arguments.length; _i++) {
                                             groups[_i] = arguments[_i];
                                         }
                                         return exclude.map(function (groupNumberOrString) {
-                                            // RegExp group numbers are 1-based, but the first element in groups
-                                            // is actually the original string, so it all works out in the end.
                                             if (typeof groupNumberOrString === "number") {
                                                 if (!ts.isString(groups[groupNumberOrString])) {
-                                                    // Specification was wrong - exclude nothing!
                                                     _this.logger.info("Incorrect RegExp specification in safelist rule " + name + " - not enough groups");
-                                                    // * can't appear in a filename; escape it because it's feeding into a RegExp
                                                     return "\\*";
                                                 }
                                                 return ProjectService.escapeFilenameForRegex(groups[groupNumberOrString]);
@@ -114529,13 +115239,12 @@ var ts;
                                         excludeRules.push(processedRule);
                                     }
                                 };
-                                for (var _c = 0, _d = rule_2.exclude; _c < _d.length; _c++) {
+                                for (var _c = 0, _d = rule.exclude; _c < _d.length; _c++) {
                                     var exclude = _d[_c];
-                                    _loop_32(exclude);
+                                    _loop_7(exclude);
                                 }
                             }
                             else {
-                                // If not rules listed, add the default rule to exclude the matched file
                                 var escaped = ProjectService.escapeFilenameForRegex(root);
                                 if (excludeRules.indexOf(escaped) < 0) {
                                     excludeRules.push(escaped);
@@ -114547,11 +115256,11 @@ var ts;
                 var this_2 = this;
                 for (var _i = 0, _a = Object.keys(this.safelist); _i < _a.length; _i++) {
                     var name = _a[_i];
-                    _loop_30(name);
+                    _loop_5(name);
                 }
                 var excludeRegexes = excludeRules.map(function (e) { return new RegExp(e, "i"); });
                 var filesToKeep = [];
-                var _loop_31 = function (i) {
+                var _loop_6 = function (i) {
                     if (excludeRegexes.some(function (re) { return re.test(normalizedNames[i]); })) {
                         excludedFiles.push(normalizedNames[i]);
                     }
@@ -114565,11 +115274,8 @@ var ts;
                                 if (this_3.legacySafelist[cleanedTypingName]) {
                                     this_3.logger.info("Excluded '" + normalizedNames[i] + "' because it matched " + cleanedTypingName + " from the legacy safelist");
                                     excludedFiles.push(normalizedNames[i]);
-                                    // *exclude* it from the project...
                                     exclude = true;
-                                    // ... but *include* it in the list of types to acquire
                                     var typeName = this_3.legacySafelist[cleanedTypingName];
-                                    // Same best-effort dedupe as above
                                     if (typeAcqInclude.indexOf(typeName) < 0) {
                                         typeAcqInclude.push(typeName);
                                     }
@@ -114577,7 +115283,6 @@ var ts;
                             }
                         }
                         if (!exclude) {
-                            // Exclude any minified files that get this far
                             if (/^.+[\.-]min\.js$/.test(normalizedNames[i])) {
                                 excludedFiles.push(normalizedNames[i]);
                             }
@@ -114589,14 +115294,12 @@ var ts;
                 };
                 var this_3 = this;
                 for (var i = 0; i < proj.rootFiles.length; i++) {
-                    _loop_31(i);
+                    _loop_6(i);
                 }
                 proj.rootFiles = filesToKeep;
                 return excludedFiles;
             };
             ProjectService.prototype.openExternalProject = function (proj) {
-                // typingOptions has been deprecated and is only supported for backward compatibility
-                // purposes. It should be removed in future releases - use typeAcquisition instead.
                 if (proj.typingOptions && !proj.typeAcquisition) {
                     var typeAcquisition = ts.convertEnableAutoDiscoveryToEnable(proj.typingOptions);
                     proj.typeAcquisition = typeAcquisition;
@@ -114611,18 +115314,17 @@ var ts;
                 var tsConfigFiles;
                 var rootFiles = [];
                 for (var _i = 0, _a = proj.rootFiles; _i < _a.length; _i++) {
-                    var file_24 = _a[_i];
-                    var normalized = server.toNormalizedPath(file_24.fileName);
+                    var file = _a[_i];
+                    var normalized = server.toNormalizedPath(file.fileName);
                     if (server.getBaseConfigFileName(normalized)) {
                         if (!this.syntaxOnly && this.host.fileExists(normalized)) {
                             (tsConfigFiles || (tsConfigFiles = [])).push(normalized);
                         }
                     }
                     else {
-                        rootFiles.push(file_24);
+                        rootFiles.push(file);
                     }
                 }
-                // sort config files to simplify comparison later
                 if (tsConfigFiles) {
                     tsConfigFiles.sort();
                 }
@@ -114639,22 +115341,16 @@ var ts;
                         else {
                             externalProject.enableLanguageService();
                         }
-                        // external project already exists and not config files were added - update the project and return;
                         this.updateNonInferredProject(externalProject, proj.rootFiles, externalFilePropertyReader, compilerOptions, proj.typeAcquisition, proj.options.compileOnSave);
                         return;
                     }
-                    // some config files were added to external project (that previously were not there)
-                    // close existing project and later we'll open a set of configured projects for these files
                     this.closeExternalProject(proj.projectFileName);
                 }
                 else if (this.externalProjectToConfiguredProjectMap.get(proj.projectFileName)) {
-                    // this project used to include config files
                     if (!tsConfigFiles) {
-                        // config files were removed from the project - close existing external project which in turn will close configured projects
                         this.closeExternalProject(proj.projectFileName);
                     }
                     else {
-                        // project previously had some config files - compare them with new set of files and close all configured projects that correspond to unused files
                         var oldConfigFiles = this.externalProjectToConfiguredProjectMap.get(proj.projectFileName);
                         var iNew = 0;
                         var iOld = 0;
@@ -114669,50 +115365,43 @@ var ts;
                                 iNew++;
                             }
                             else {
-                                // record existing config files so avoid extra add-refs
                                 (exisingConfigFiles || (exisingConfigFiles = [])).push(oldConfig);
                                 iOld++;
                                 iNew++;
                             }
                         }
                         for (var i = iOld; i < oldConfigFiles.length; i++) {
-                            // projects for all remaining old config files should be closed
                             this.closeConfiguredProjectReferencedFromExternalProject(oldConfigFiles[i]);
                         }
                     }
                 }
                 if (tsConfigFiles) {
-                    // store the list of tsconfig files that belong to the external project
                     this.externalProjectToConfiguredProjectMap.set(proj.projectFileName, tsConfigFiles);
                     for (var _b = 0, tsConfigFiles_1 = tsConfigFiles; _b < tsConfigFiles_1.length; _b++) {
                         var tsconfigFile = tsConfigFiles_1[_b];
                         var project = this.findConfiguredProjectByProjectName(tsconfigFile);
                         if (!project) {
-                            // errors are stored in the project
                             project = this.createConfiguredProject(tsconfigFile);
                         }
                         if (project && !ts.contains(exisingConfigFiles, tsconfigFile)) {
-                            // keep project alive even if no documents are opened - its lifetime is bound to the lifetime of containing external project
                             project.addExternalProjectReference();
                         }
                     }
                 }
                 else {
-                    // no config files - remove the item from the collection
                     this.externalProjectToConfiguredProjectMap.delete(proj.projectFileName);
                     this.createExternalProject(proj.projectFileName, rootFiles, proj.options, proj.typeAcquisition, excludedFiles);
                 }
             };
             ProjectService.prototype.hasDeferredExtension = function () {
-                for (var _i = 0, _a = this.hostConfiguration.extraFileExtensions; _i < _a.length; _i++) { // TODO: GH#18217
+                for (var _i = 0, _a = this.hostConfiguration.extraFileExtensions; _i < _a.length; _i++) {
                     var extension = _a[_i];
-                    if (extension.scriptKind === 7 /* Deferred */) {
+                    if (extension.scriptKind === 7) {
                         return true;
                     }
                 }
                 return false;
             };
-            /** Makes a filename safe to insert in a RegExp */
             ProjectService.filenameEscapeRegexp = /[-\/\\^$*+?.()|[\]{}]/g;
             return ProjectService;
         }());
@@ -114734,18 +115423,6 @@ var ts;
             return ((1e9 * seconds) + nanoseconds) / 1000000.0;
         }
         function isDeclarationFileInJSOnlyNonConfiguredProject(project, file) {
-            // Checking for semantic diagnostics is an expensive process. We want to avoid it if we
-            // know for sure it is not needed.
-            // For instance, .d.ts files injected by ATA automatically do not produce any relevant
-            // errors to a JS- only project.
-            //
-            // Note that configured projects can set skipLibCheck (on by default in jsconfig.json) to
-            // disable checking for declaration files. We only need to verify for inferred projects (e.g.
-            // miscellaneous context in VS) and external projects(e.g.VS.csproj project) with only JS
-            // files.
-            //
-            // We still want to check .js files in a JS-only inferred or external project (e.g. if the
-            // file has '// @ts-check').
             if ((project.projectKind === server.ProjectKind.Inferred || project.projectKind === server.ProjectKind.External) &&
                 project.isJsOnlyProject()) {
                 var scriptInfo = project.getScriptInfoForNormalizedPath(file);
@@ -114773,7 +115450,7 @@ var ts;
             }
         }
         function formatDiag(fileName, project, diag) {
-            var scriptInfo = project.getScriptInfoForNormalizedPath(fileName); // TODO: GH#18217
+            var scriptInfo = project.getScriptInfoForNormalizedPath(fileName);
             return {
                 start: scriptInfo.positionToLineOffset(diag.start),
                 end: scriptInfo.positionToLineOffset(diag.start + diag.length),
@@ -114788,8 +115465,8 @@ var ts;
             return { line: lineAndCharacter.line + 1, offset: lineAndCharacter.character + 1 };
         }
         function formatConfigFileDiag(diag, includeFileName) {
-            var start = (diag.file && convertToLocation(ts.getLineAndCharacterOfPosition(diag.file, diag.start))); // TODO: GH#18217
-            var end = (diag.file && convertToLocation(ts.getLineAndCharacterOfPosition(diag.file, diag.start + diag.length))); // TODO: GH#18217
+            var start = (diag.file && convertToLocation(ts.getLineAndCharacterOfPosition(diag.file, diag.start)));
+            var end = (diag.file && convertToLocation(ts.getLineAndCharacterOfPosition(diag.file, diag.start + diag.length)));
             var text = ts.flattenDiagnosticMessageText(diag.messageText, "\n");
             var code = diag.code, source = diag.source;
             var category = ts.diagnosticCategoryName(diag);
@@ -114797,15 +115474,15 @@ var ts;
                 { start: start, end: end, text: text, code: code, category: category, reportsUnnecessary: diag.reportsUnnecessary, source: source };
         }
         function allEditsBeforePos(edits, pos) {
-            for (var _i = 0, edits_2 = edits; _i < edits_2.length; _i++) {
-                var edit = edits_2[_i];
+            for (var _i = 0, edits_1 = edits; _i < edits_1.length; _i++) {
+                var edit = edits_1[_i];
                 if (ts.textSpanEnd(edit.span) >= pos) {
                     return false;
                 }
             }
             return true;
         }
-        server.CommandNames = server.protocol.CommandTypes; // tslint:disable-line variable-name
+        server.CommandNames = server.protocol.CommandTypes;
         function formatMessage(msg, logger, byteLength, newLine) {
             var verboseLogging = logger.hasLevel(server.LogLevel.verbose);
             var json = JSON.stringify(msg);
@@ -114816,11 +115493,7 @@ var ts;
             return "Content-Length: " + (1 + len) + "\r\n\r\n" + json + newLine;
         }
         server.formatMessage = formatMessage;
-        /**
-         * Represents operation that can schedule its next step to be executed later.
-         * Scheduling is done via instance of NextStep. If on current step subsequent step was not scheduled - operation is assumed to be completed.
-         */
-        var MultistepOperation = /** @class */ (function () {
+        var MultistepOperation = (function () {
             function MultistepOperation(operationHost) {
                 this.operationHost = operationHost;
             }
@@ -114867,7 +115540,6 @@ var ts;
                 }
                 catch (e) {
                     stop = true;
-                    // ignore cancellation request
                     if (!(e instanceof ts.OperationCanceledException)) {
                         this.operationHost.logError(e, "delayed processing of request " + this.requestId);
                     }
@@ -114893,7 +115565,6 @@ var ts;
             };
             return MultistepOperation;
         }());
-        /** @internal */
         function toEvent(eventName, body) {
             return {
                 seq: 0,
@@ -114906,9 +115577,6 @@ var ts;
         function isProjectsArray(projects) {
             return !!projects.length;
         }
-        /**
-         * This helper function processes a list of projects and return the concatenated, sortd and deduplicated output of processing each project.
-         */
         function combineProjectOutput(defaultValue, getValue, projects, action, comparer, areEqual) {
             var outputs = ts.flatMap(isProjectsArray(projects) ? projects : projects.projects, function (project) { return action(project, defaultValue); });
             if (!isProjectsArray(projects) && projects.symLinkedProjects) {
@@ -114921,7 +115589,7 @@ var ts;
                 ? ts.sortAndDeduplicate(outputs, comparer, areEqual)
                 : ts.deduplicate(outputs, areEqual);
         }
-        var Session = /** @class */ (function () {
+        var Session = (function () {
             function Session(opts) {
                 var _a;
                 var _this = this;
@@ -114933,18 +115601,15 @@ var ts;
                     },
                     _a[server.CommandNames.OpenExternalProject] = function (request) {
                         _this.projectService.openExternalProject(request.arguments);
-                        // TODO: GH#20447 report errors
-                        return _this.requiredResponse(/*response*/ true);
+                        return _this.requiredResponse(true);
                     },
                     _a[server.CommandNames.OpenExternalProjects] = function (request) {
                         _this.projectService.openExternalProjects(request.arguments.projects);
-                        // TODO: GH#20447 report errors
-                        return _this.requiredResponse(/*response*/ true);
+                        return _this.requiredResponse(true);
                     },
                     _a[server.CommandNames.CloseExternalProject] = function (request) {
                         _this.projectService.closeExternalProject(request.arguments.projectFileName);
-                        // TODO: GH#20447 report errors
-                        return _this.requiredResponse(/*response*/ true);
+                        return _this.requiredResponse(true);
                     },
                     _a[server.CommandNames.SynchronizeProjectList] = function (request) {
                         var result = _this.projectService.synchronizeProjectList(request.arguments.knownProjects);
@@ -114959,73 +115624,71 @@ var ts;
                                 info: p.info,
                                 changes: p.changes,
                                 files: p.files,
-                                projectErrors: _this.convertToDiagnosticsWithLinePosition(p.projectErrors, /*scriptInfo*/ undefined)
+                                projectErrors: _this.convertToDiagnosticsWithLinePosition(p.projectErrors, undefined)
                             };
                         });
                         return _this.requiredResponse(converted);
                     },
                     _a[server.CommandNames.ApplyChangedToOpenFiles] = function (request) {
                         _this.changeSeq++;
-                        _this.projectService.applyChangesInOpenFiles(request.arguments.openFiles, request.arguments.changedFiles, request.arguments.closedFiles); // TODO: GH#18217
-                        // TODO: report errors
-                        return _this.requiredResponse(/*response*/ true);
+                        _this.projectService.applyChangesInOpenFiles(request.arguments.openFiles, request.arguments.changedFiles, request.arguments.closedFiles);
+                        return _this.requiredResponse(true);
                     },
                     _a[server.CommandNames.Exit] = function () {
                         _this.exit();
                         return _this.notRequired();
                     },
                     _a[server.CommandNames.Definition] = function (request) {
-                        return _this.requiredResponse(_this.getDefinition(request.arguments, /*simplifiedResult*/ true));
+                        return _this.requiredResponse(_this.getDefinition(request.arguments, true));
                     },
                     _a[server.CommandNames.DefinitionFull] = function (request) {
-                        return _this.requiredResponse(_this.getDefinition(request.arguments, /*simplifiedResult*/ false));
+                        return _this.requiredResponse(_this.getDefinition(request.arguments, false));
                     },
                     _a[server.CommandNames.DefinitionAndBoundSpan] = function (request) {
-                        return _this.requiredResponse(_this.getDefinitionAndBoundSpan(request.arguments, /*simplifiedResult*/ true));
+                        return _this.requiredResponse(_this.getDefinitionAndBoundSpan(request.arguments, true));
                     },
                     _a[server.CommandNames.DefinitionAndBoundSpanFull] = function (request) {
-                        return _this.requiredResponse(_this.getDefinitionAndBoundSpan(request.arguments, /*simplifiedResult*/ false));
+                        return _this.requiredResponse(_this.getDefinitionAndBoundSpan(request.arguments, false));
                     },
                     _a[server.CommandNames.TypeDefinition] = function (request) {
                         return _this.requiredResponse(_this.getTypeDefinition(request.arguments));
                     },
                     _a[server.CommandNames.Implementation] = function (request) {
-                        return _this.requiredResponse(_this.getImplementation(request.arguments, /*simplifiedResult*/ true));
+                        return _this.requiredResponse(_this.getImplementation(request.arguments, true));
                     },
                     _a[server.CommandNames.ImplementationFull] = function (request) {
-                        return _this.requiredResponse(_this.getImplementation(request.arguments, /*simplifiedResult*/ false));
+                        return _this.requiredResponse(_this.getImplementation(request.arguments, false));
                     },
                     _a[server.CommandNames.References] = function (request) {
-                        return _this.requiredResponse(_this.getReferences(request.arguments, /*simplifiedResult*/ true));
+                        return _this.requiredResponse(_this.getReferences(request.arguments, true));
                     },
                     _a[server.CommandNames.ReferencesFull] = function (request) {
-                        return _this.requiredResponse(_this.getReferences(request.arguments, /*simplifiedResult*/ false));
+                        return _this.requiredResponse(_this.getReferences(request.arguments, false));
                     },
                     _a[server.CommandNames.Rename] = function (request) {
-                        return _this.requiredResponse(_this.getRenameLocations(request.arguments, /*simplifiedResult*/ true));
+                        return _this.requiredResponse(_this.getRenameLocations(request.arguments, true));
                     },
                     _a[server.CommandNames.RenameLocationsFull] = function (request) {
-                        return _this.requiredResponse(_this.getRenameLocations(request.arguments, /*simplifiedResult*/ false));
+                        return _this.requiredResponse(_this.getRenameLocations(request.arguments, false));
                     },
                     _a[server.CommandNames.RenameInfoFull] = function (request) {
                         return _this.requiredResponse(_this.getRenameInfo(request.arguments));
                     },
                     _a[server.CommandNames.Open] = function (request) {
-                        _this.openClientFile(server.toNormalizedPath(request.arguments.file), request.arguments.fileContent, server.convertScriptKindName(request.arguments.scriptKindName), // TODO: GH#18217
-                        request.arguments.projectRootPath ? server.toNormalizedPath(request.arguments.projectRootPath) : undefined);
+                        _this.openClientFile(server.toNormalizedPath(request.arguments.file), request.arguments.fileContent, server.convertScriptKindName(request.arguments.scriptKindName), request.arguments.projectRootPath ? server.toNormalizedPath(request.arguments.projectRootPath) : undefined);
                         return _this.notRequired();
                     },
                     _a[server.CommandNames.Quickinfo] = function (request) {
-                        return _this.requiredResponse(_this.getQuickInfoWorker(request.arguments, /*simplifiedResult*/ true));
+                        return _this.requiredResponse(_this.getQuickInfoWorker(request.arguments, true));
                     },
                     _a[server.CommandNames.QuickinfoFull] = function (request) {
-                        return _this.requiredResponse(_this.getQuickInfoWorker(request.arguments, /*simplifiedResult*/ false));
+                        return _this.requiredResponse(_this.getQuickInfoWorker(request.arguments, false));
                     },
                     _a[server.CommandNames.GetOutliningSpans] = function (request) {
-                        return _this.requiredResponse(_this.getOutliningSpans(request.arguments, /*simplifiedResult*/ true));
+                        return _this.requiredResponse(_this.getOutliningSpans(request.arguments, true));
                     },
                     _a[server.CommandNames.GetOutliningSpansFull] = function (request) {
-                        return _this.requiredResponse(_this.getOutliningSpans(request.arguments, /*simplifiedResult*/ false));
+                        return _this.requiredResponse(_this.getOutliningSpans(request.arguments, false));
                     },
                     _a[server.CommandNames.TodoComments] = function (request) {
                         return _this.requiredResponse(_this.getTodoComments(request.arguments));
@@ -115064,16 +115727,16 @@ var ts;
                         return _this.requiredResponse(_this.getFormattingEditsForRangeFull(request.arguments));
                     },
                     _a[server.CommandNames.Completions] = function (request) {
-                        return _this.requiredResponse(_this.getCompletions(request.arguments, /*simplifiedResult*/ true));
+                        return _this.requiredResponse(_this.getCompletions(request.arguments, true));
                     },
                     _a[server.CommandNames.CompletionsFull] = function (request) {
-                        return _this.requiredResponse(_this.getCompletions(request.arguments, /*simplifiedResult*/ false));
+                        return _this.requiredResponse(_this.getCompletions(request.arguments, false));
                     },
                     _a[server.CommandNames.CompletionDetails] = function (request) {
-                        return _this.requiredResponse(_this.getCompletionEntryDetails(request.arguments, /*simplifiedResult*/ true));
+                        return _this.requiredResponse(_this.getCompletionEntryDetails(request.arguments, true));
                     },
                     _a[server.CommandNames.CompletionDetailsFull] = function (request) {
-                        return _this.requiredResponse(_this.getCompletionEntryDetails(request.arguments, /*simplifiedResult*/ false));
+                        return _this.requiredResponse(_this.getCompletionEntryDetails(request.arguments, false));
                     },
                     _a[server.CommandNames.CompileOnSaveAffectedFileList] = function (request) {
                         return _this.requiredResponse(_this.getCompileOnSaveAffectedFileList(request.arguments));
@@ -115082,10 +115745,10 @@ var ts;
                         return _this.requiredResponse(_this.emitFile(request.arguments));
                     },
                     _a[server.CommandNames.SignatureHelp] = function (request) {
-                        return _this.requiredResponse(_this.getSignatureHelpItems(request.arguments, /*simplifiedResult*/ true));
+                        return _this.requiredResponse(_this.getSignatureHelpItems(request.arguments, true));
                     },
                     _a[server.CommandNames.SignatureHelpFull] = function (request) {
-                        return _this.requiredResponse(_this.getSignatureHelpItems(request.arguments, /*simplifiedResult*/ false));
+                        return _this.requiredResponse(_this.getSignatureHelpItems(request.arguments, false));
                     },
                     _a[server.CommandNames.CompilerOptionsDiagnosticsFull] = function (request) {
                         return _this.requiredResponse(_this.getCompilerOptionsDiagnostics(request.arguments));
@@ -115095,7 +115758,7 @@ var ts;
                     },
                     _a[server.CommandNames.Cleanup] = function () {
                         _this.cleanup();
-                        return _this.requiredResponse(/*response*/ true);
+                        return _this.requiredResponse(true);
                     },
                     _a[server.CommandNames.SemanticDiagnosticsSync] = function (request) {
                         return _this.requiredResponse(_this.getSemanticDiagnosticsSync(request.arguments));
@@ -115120,7 +115783,7 @@ var ts;
                     },
                     _a[server.CommandNames.Configure] = function (request) {
                         _this.projectService.setHostConfiguration(request.arguments);
-                        _this.doOutput(/*info*/ undefined, server.CommandNames.Configure, request.seq, /*success*/ true);
+                        _this.doOutput(undefined, server.CommandNames.Configure, request.seq, true);
                         return _this.notRequired();
                     },
                     _a[server.CommandNames.Reload] = function (request) {
@@ -115138,41 +115801,41 @@ var ts;
                         return _this.notRequired();
                     },
                     _a[server.CommandNames.Navto] = function (request) {
-                        return _this.requiredResponse(_this.getNavigateToItems(request.arguments, /*simplifiedResult*/ true));
+                        return _this.requiredResponse(_this.getNavigateToItems(request.arguments, true));
                     },
                     _a[server.CommandNames.NavtoFull] = function (request) {
-                        return _this.requiredResponse(_this.getNavigateToItems(request.arguments, /*simplifiedResult*/ false));
+                        return _this.requiredResponse(_this.getNavigateToItems(request.arguments, false));
                     },
                     _a[server.CommandNames.Brace] = function (request) {
-                        return _this.requiredResponse(_this.getBraceMatching(request.arguments, /*simplifiedResult*/ true));
+                        return _this.requiredResponse(_this.getBraceMatching(request.arguments, true));
                     },
                     _a[server.CommandNames.BraceFull] = function (request) {
-                        return _this.requiredResponse(_this.getBraceMatching(request.arguments, /*simplifiedResult*/ false));
+                        return _this.requiredResponse(_this.getBraceMatching(request.arguments, false));
                     },
                     _a[server.CommandNames.NavBar] = function (request) {
-                        return _this.requiredResponse(_this.getNavigationBarItems(request.arguments, /*simplifiedResult*/ true));
+                        return _this.requiredResponse(_this.getNavigationBarItems(request.arguments, true));
                     },
                     _a[server.CommandNames.NavBarFull] = function (request) {
-                        return _this.requiredResponse(_this.getNavigationBarItems(request.arguments, /*simplifiedResult*/ false));
+                        return _this.requiredResponse(_this.getNavigationBarItems(request.arguments, false));
                     },
                     _a[server.CommandNames.NavTree] = function (request) {
-                        return _this.requiredResponse(_this.getNavigationTree(request.arguments, /*simplifiedResult*/ true));
+                        return _this.requiredResponse(_this.getNavigationTree(request.arguments, true));
                     },
                     _a[server.CommandNames.NavTreeFull] = function (request) {
-                        return _this.requiredResponse(_this.getNavigationTree(request.arguments, /*simplifiedResult*/ false));
+                        return _this.requiredResponse(_this.getNavigationTree(request.arguments, false));
                     },
                     _a[server.CommandNames.Occurrences] = function (request) {
                         return _this.requiredResponse(_this.getOccurrences(request.arguments));
                     },
                     _a[server.CommandNames.DocumentHighlights] = function (request) {
-                        return _this.requiredResponse(_this.getDocumentHighlights(request.arguments, /*simplifiedResult*/ true));
+                        return _this.requiredResponse(_this.getDocumentHighlights(request.arguments, true));
                     },
                     _a[server.CommandNames.DocumentHighlightsFull] = function (request) {
-                        return _this.requiredResponse(_this.getDocumentHighlights(request.arguments, /*simplifiedResult*/ false));
+                        return _this.requiredResponse(_this.getDocumentHighlights(request.arguments, false));
                     },
                     _a[server.CommandNames.CompilerOptionsForInferredProjects] = function (request) {
                         _this.setCompilerOptionsForInferredProjects(request.arguments);
-                        return _this.requiredResponse(/*response*/ true);
+                        return _this.requiredResponse(true);
                     },
                     _a[server.CommandNames.ProjectInfo] = function (request) {
                         return _this.requiredResponse(_this.getProjectInfo(request.arguments));
@@ -115185,16 +115848,16 @@ var ts;
                         return _this.requiredResponse(_this.getJsxClosingTag(request.arguments));
                     },
                     _a[server.CommandNames.GetCodeFixes] = function (request) {
-                        return _this.requiredResponse(_this.getCodeFixes(request.arguments, /*simplifiedResult*/ true));
+                        return _this.requiredResponse(_this.getCodeFixes(request.arguments, true));
                     },
                     _a[server.CommandNames.GetCodeFixesFull] = function (request) {
-                        return _this.requiredResponse(_this.getCodeFixes(request.arguments, /*simplifiedResult*/ false));
+                        return _this.requiredResponse(_this.getCodeFixes(request.arguments, false));
                     },
                     _a[server.CommandNames.GetCombinedCodeFix] = function (request) {
-                        return _this.requiredResponse(_this.getCombinedCodeFix(request.arguments, /*simplifiedResult*/ true));
+                        return _this.requiredResponse(_this.getCombinedCodeFix(request.arguments, true));
                     },
                     _a[server.CommandNames.GetCombinedCodeFixFull] = function (request) {
-                        return _this.requiredResponse(_this.getCombinedCodeFix(request.arguments, /*simplifiedResult*/ false));
+                        return _this.requiredResponse(_this.getCombinedCodeFix(request.arguments, false));
                     },
                     _a[server.CommandNames.ApplyCodeActionCommand] = function (request) {
                         return _this.requiredResponse(_this.applyCodeActionCommand(request.arguments));
@@ -115206,22 +115869,22 @@ var ts;
                         return _this.requiredResponse(_this.getApplicableRefactors(request.arguments));
                     },
                     _a[server.CommandNames.GetEditsForRefactor] = function (request) {
-                        return _this.requiredResponse(_this.getEditsForRefactor(request.arguments, /*simplifiedResult*/ true));
+                        return _this.requiredResponse(_this.getEditsForRefactor(request.arguments, true));
                     },
                     _a[server.CommandNames.GetEditsForRefactorFull] = function (request) {
-                        return _this.requiredResponse(_this.getEditsForRefactor(request.arguments, /*simplifiedResult*/ false));
+                        return _this.requiredResponse(_this.getEditsForRefactor(request.arguments, false));
                     },
                     _a[server.CommandNames.OrganizeImports] = function (request) {
-                        return _this.requiredResponse(_this.organizeImports(request.arguments, /*simplifiedResult*/ true));
+                        return _this.requiredResponse(_this.organizeImports(request.arguments, true));
                     },
                     _a[server.CommandNames.OrganizeImportsFull] = function (request) {
-                        return _this.requiredResponse(_this.organizeImports(request.arguments, /*simplifiedResult*/ false));
+                        return _this.requiredResponse(_this.organizeImports(request.arguments, false));
                     },
                     _a[server.CommandNames.GetEditsForFileRename] = function (request) {
-                        return _this.requiredResponse(_this.getEditsForFileRename(request.arguments, /*simplifiedResult*/ true));
+                        return _this.requiredResponse(_this.getEditsForFileRename(request.arguments, true));
                     },
                     _a[server.CommandNames.GetEditsForFileRenameFull] = function (request) {
-                        return _this.requiredResponse(_this.getEditsForFileRename(request.arguments, /*simplifiedResult*/ false));
+                        return _this.requiredResponse(_this.getEditsForFileRename(request.arguments, false));
                     },
                     _a));
                 this.host = opts.host;
@@ -115262,7 +115925,7 @@ var ts;
                     syntaxOnly: opts.syntaxOnly,
                 };
                 this.projectService = new server.ProjectService(settings);
-                this.gcTimer = new server.GcTimer(this.host, /*delay*/ 7000, this.logger);
+                this.gcTimer = new server.GcTimer(this.host, 7000, this.logger);
             }
             Session.prototype.sendRequestCompletedEvent = function (requestId) {
                 this.event({ request_seq: requestId }, "requestCompleted");
@@ -115275,7 +115938,7 @@ var ts;
                         break;
                     case server.ConfigFileDiagEvent:
                         var _a = event.data, triggerFile = _a.triggerFile, configFile = _a.configFileName, diagnostics = _a.diagnostics;
-                        var bakedDiags = ts.map(diagnostics, function (diagnostic) { return formatConfigFileDiag(diagnostic, /*includeFileName*/ true); });
+                        var bakedDiags = ts.map(diagnostics, function (diagnostic) { return formatConfigFileDiag(diagnostic, true); });
                         this.event({
                             triggerFile: triggerFile,
                             configFile: configFile,
@@ -115306,10 +115969,8 @@ var ts;
                 if (openFiles.length) {
                     if (!this.suppressDiagnosticEvents && !this.noGetErrOnBackgroundUpdate) {
                         var checkList_1 = this.createCheckList(openFiles);
-                        // For now only queue error checking for open files. We can change this to include non open files as well
-                        this.errorCheck.startNew(function (next) { return _this.updateErrorCheck(next, checkList_1, 100, /*requireOpen*/ true); });
+                        this.errorCheck.startNew(function (next) { return _this.updateErrorCheck(next, checkList_1, 100, true); });
                     }
-                    // Send project changed event
                     this.event({
                         openFiles: openFiles
                     }, "projectsUpdatedInBackground");
@@ -115337,10 +115998,8 @@ var ts;
             Session.prototype.event = function (body, eventName) {
                 this.send(toEvent(eventName, body));
             };
-            // For backwards-compatibility only.
-            /** @deprecated */
             Session.prototype.output = function (info, cmdName, reqSeq, errorMsg) {
-                this.doOutput(info, cmdName, reqSeq, /*success*/ !errorMsg, errorMsg); // TODO: GH#18217
+                this.doOutput(info, cmdName, reqSeq, !errorMsg, errorMsg);
             };
             Session.prototype.doOutput = function (info, cmdName, reqSeq, success, message) {
                 var res = {
@@ -115381,11 +116040,10 @@ var ts;
                     this.logError(err, kind);
                 }
             };
-            /** It is the caller's responsibility to verify that `!this.suppressDiagnosticEvents`. */
             Session.prototype.updateErrorCheck = function (next, checkList, ms, requireOpen) {
                 var _this = this;
                 if (requireOpen === void 0) { requireOpen = true; }
-                ts.Debug.assert(!this.suppressDiagnosticEvents); // Caller's responsibility
+                ts.Debug.assert(!this.suppressDiagnosticEvents);
                 var seq = this.changeSeq;
                 var followMs = Math.min(ms, 200);
                 var index = 0;
@@ -115434,7 +116092,7 @@ var ts;
                 this.logger.info("cleaning " + caption);
                 for (var _i = 0, projects_5 = projects; _i < projects_5.length; _i++) {
                     var p = projects_5[_i];
-                    p.getLanguageService(/*ensureSynchronized*/ false).cleanupSemanticCache();
+                    p.getLanguageService(false).cleanupSemanticCache();
                 }
             };
             Session.prototype.cleanup = function () {
@@ -115467,7 +116125,7 @@ var ts;
                 var diagnosticsForConfigFile = ts.filter(ts.concatenate(projectErrors, optionsErrors), function (diagnostic) { return !!diagnostic.file && diagnostic.file.fileName === configFile; });
                 return includeLinePosition ?
                     this.convertToDiagnosticsWithLinePositionFromDiagnosticFile(diagnosticsForConfigFile) :
-                    ts.map(diagnosticsForConfigFile, function (diagnostic) { return formatConfigFileDiag(diagnostic, /*includeFileName*/ false); });
+                    ts.map(diagnosticsForConfigFile, function (diagnostic) { return formatConfigFileDiag(diagnostic, false); });
             };
             Session.prototype.convertToDiagnosticsWithLinePositionFromDiagnosticFile = function (diagnostics) {
                 var _this = this;
@@ -115478,16 +116136,12 @@ var ts;
                     category: ts.diagnosticCategoryName(d),
                     code: d.code,
                     startLocation: (d.file && convertToLocation(ts.getLineAndCharacterOfPosition(d.file, d.start))),
-                    endLocation: (d.file && convertToLocation(ts.getLineAndCharacterOfPosition(d.file, d.start + d.length))) // TODO: GH#18217
+                    endLocation: (d.file && convertToLocation(ts.getLineAndCharacterOfPosition(d.file, d.start + d.length)))
                 }); });
             };
             Session.prototype.getCompilerOptionsDiagnostics = function (args) {
                 var project = this.getProject(args.projectFileName);
-                // Get diagnostics that dont have associated file with them
-                // The diagnostics which have file would be in config file and
-                // would be reported as part of configFileDiagnostics
-                return this.convertToDiagnosticsWithLinePosition(ts.filter(project.getLanguageService().getCompilerOptionsDiagnostics(), function (diagnostic) { return !diagnostic.file; }), 
-                /*scriptInfo*/ undefined);
+                return this.convertToDiagnosticsWithLinePosition(ts.filter(project.getLanguageService().getCompilerOptionsDiagnostics(), function (diagnostic) { return !diagnostic.file; }), undefined);
             };
             Session.prototype.convertToDiagnosticsWithLinePosition = function (diagnostics, scriptInfo) {
                 var _this = this;
@@ -115534,7 +116188,7 @@ var ts;
                 if (!definitionAndBoundSpan || !definitionAndBoundSpan.definitions) {
                     return {
                         definitions: server.emptyArray,
-                        textSpan: undefined // TODO: GH#18217
+                        textSpan: undefined
                     };
                 }
                 if (simplifiedResult) {
@@ -115549,13 +116203,6 @@ var ts;
                 var _this = this;
                 return definitions.map(function (def) { return _this.toFileSpan(def.fileName, def.textSpan, project); });
             };
-            /*
-             * When we map a .d.ts location to .ts, Visual Studio gets confused because there's no associated Roslyn Document in
-             * the same project which corresponds to the file. VS Code has no problem with this, and luckily we have two protocols.
-             * This retains the existing behavior for the "simplified" (VS Code) protocol but stores the .d.ts location in a
-             * set of additional fields, and does the reverse for VS (store the .d.ts location where
-             * it used to be and stores the .ts location in the additional fields).
-            */
             Session.mapToOriginalLocation = function (def) {
                 if (def.originalFileName) {
                     ts.Debug.assert(def.originalTextSpan !== undefined, "originalTextSpan should be present if originalFileName is");
@@ -115565,7 +116212,7 @@ var ts;
             };
             Session.prototype.toFileSpan = function (fileName, textSpan, project) {
                 var ls = project.getLanguageService();
-                var start = ls.toLineColumnOffset(fileName, textSpan.start); // TODO: GH#18217
+                var start = ls.toLineColumnOffset(fileName, textSpan.start);
                 var end = ls.toLineColumnOffset(fileName, ts.textSpanEnd(textSpan));
                 return {
                     file: fileName,
@@ -115614,7 +116261,6 @@ var ts;
                         file: fileName,
                         isWriteAccess: isWriteAccess,
                     };
-                    // no need to serialize the property if it is not true
                     if (isInString) {
                         result.isInString = isInString;
                     }
@@ -115624,26 +116270,23 @@ var ts;
             Session.prototype.getSyntacticDiagnosticsSync = function (args) {
                 var configFile = this.getConfigFileAndProject(args).configFile;
                 if (configFile) {
-                    // all the config file errors are reported as part of semantic check so nothing to report here
                     return server.emptyArray;
                 }
-                return this.getDiagnosticsWorker(args, /*isSemantic*/ false, function (project, file) { return project.getLanguageService().getSyntacticDiagnostics(file); }, !!args.includeLinePosition);
+                return this.getDiagnosticsWorker(args, false, function (project, file) { return project.getLanguageService().getSyntacticDiagnostics(file); }, !!args.includeLinePosition);
             };
             Session.prototype.getSemanticDiagnosticsSync = function (args) {
                 var _a = this.getConfigFileAndProject(args), configFile = _a.configFile, project = _a.project;
                 if (configFile) {
-                    return this.getConfigFileDiagnostics(configFile, project, !!args.includeLinePosition); // TODO: GH#18217
+                    return this.getConfigFileDiagnostics(configFile, project, !!args.includeLinePosition);
                 }
-                return this.getDiagnosticsWorker(args, /*isSemantic*/ true, function (project, file) { return project.getLanguageService().getSemanticDiagnostics(file); }, !!args.includeLinePosition);
+                return this.getDiagnosticsWorker(args, true, function (project, file) { return project.getLanguageService().getSemanticDiagnostics(file); }, !!args.includeLinePosition);
             };
             Session.prototype.getSuggestionDiagnosticsSync = function (args) {
                 var configFile = this.getConfigFileAndProject(args).configFile;
                 if (configFile) {
-                    // Currently there are no info diagnostics for config files.
                     return server.emptyArray;
                 }
-                // isSemantic because we don't want to info diagnostics in declaration files for JS-only users
-                return this.getDiagnosticsWorker(args, /*isSemantic*/ true, function (project, file) { return project.getLanguageService().getSuggestionDiagnostics(file); }, !!args.includeLinePosition);
+                return this.getDiagnosticsWorker(args, true, function (project, file) { return project.getLanguageService().getSuggestionDiagnostics(file); }, !!args.includeLinePosition);
             };
             Session.prototype.getJsxClosingTag = function (args) {
                 var _a = this.getFileAndProject(args), file = _a.file, project = _a.project;
@@ -115683,7 +116326,7 @@ var ts;
                 this.projectService.setCompilerOptionsForInferredProjects(args.options, args.projectRootPath);
             };
             Session.prototype.getProjectInfo = function (args) {
-                return this.getProjectInfoWorker(args.file, args.projectFileName, args.needFileNameList, /*excludeConfigFiles*/ false);
+                return this.getProjectInfoWorker(args.file, args.projectFileName, args.needFileNameList, false);
             };
             Session.prototype.getProjectInfoWorker = function (uncheckedFileName, projectFileName, needFileNameList, excludeConfigFiles) {
                 var project = this.getFileAndProjectWorker(uncheckedFileName, projectFileName).project;
@@ -115691,7 +116334,7 @@ var ts;
                 var projectInfo = {
                     configFileName: project.getProjectName(),
                     languageServiceDisabled: !project.languageServiceEnabled,
-                    fileNames: needFileNameList ? project.getFileNames(/*excludeFilesFromExternalLibraries*/ false, excludeConfigFiles) : undefined
+                    fileNames: needFileNameList ? project.getFileNames(false, excludeConfigFiles) : undefined
                 };
                 return projectInfo;
             };
@@ -115714,12 +116357,11 @@ var ts;
                     projects = scriptInfo.containingProjects;
                     symLinkedProjects = this.projectService.getSymlinkedProjects(scriptInfo);
                 }
-                // filter handles case when 'projects' is undefined
                 projects = ts.filter(projects, function (p) { return p.languageServiceEnabled && !p.isOrphan(); });
                 if ((!projects || !projects.length) && !symLinkedProjects) {
                     return server.Errors.ThrowNoProject();
                 }
-                return symLinkedProjects ? { projects: projects, symLinkedProjects: symLinkedProjects } : projects; // TODO: GH#18217
+                return symLinkedProjects ? { projects: projects, symLinkedProjects: symLinkedProjects } : projects;
             };
             Session.prototype.getDefaultProject = function (args) {
                 if (args.projectFileName) {
@@ -115738,7 +116380,6 @@ var ts;
                 var projects = this.getProjects(args);
                 if (simplifiedResult) {
                     var defaultProject = this.getDefaultProject(args);
-                    // The rename info should be the same for every project
                     var renameInfo = defaultProject.getLanguageService().getRenameInfo(file, position);
                     if (!renameInfo) {
                         return undefined;
@@ -115782,8 +116423,7 @@ var ts;
                     return { info: renameInfo, locs: locs };
                 }
                 else {
-                    return combineProjectOutput(file, function (path) { return _this.projectService.getScriptInfoForPath(path).fileName; }, projects, function (p, file) { return p.getLanguageService().findRenameLocations(file, position, args.findInStrings, args.findInComments); }, 
-                    /*comparer*/ undefined, renameLocationIsEqualTo);
+                    return combineProjectOutput(file, function (path) { return _this.projectService.getScriptInfoForPath(path).fileName; }, projects, function (p, file) { return p.getLanguageService().findRenameLocations(file, position, args.findInStrings, args.findInComments); }, undefined, renameLocationIsEqualTo);
                 }
                 function renameLocationIsEqualTo(a, b) {
                     if (a === b) {
@@ -115804,7 +116444,6 @@ var ts;
                         return 1;
                     }
                     else {
-                        // reverse sort assuming no overlap
                         if (a.start.line < b.start.line) {
                             return 1;
                         }
@@ -115858,8 +116497,7 @@ var ts;
                     };
                 }
                 else {
-                    return combineProjectOutput(file, function (path) { return _this.projectService.getScriptInfoForPath(path).fileName; }, projects, function (project, file) { return project.getLanguageService().findReferences(file, position); }, 
-                    /*comparer*/ undefined, ts.equateValues);
+                    return combineProjectOutput(file, function (path) { return _this.projectService.getScriptInfoForPath(path).fileName; }, projects, function (project, file) { return project.getLanguageService().findReferences(file, position); }, undefined, ts.equateValues);
                 }
                 function areReferencesResponseItemsForTheSameLocation(a, b) {
                     if (a && b) {
@@ -115870,12 +116508,8 @@ var ts;
                     return false;
                 }
             };
-            /**
-             * @param fileName is the name of the file to be opened
-             * @param fileContent is a version of the file content that is known to be more up to date than the one on disk
-             */
             Session.prototype.openClientFile = function (fileName, fileContent, scriptKind, projectRootPath) {
-                this.projectService.openClientFileWithNormalizedPath(fileName, fileContent, scriptKind, /*hasMixedContent*/ false, projectRootPath);
+                this.projectService.openClientFileWithNormalizedPath(fileName, fileContent, scriptKind, false, projectRootPath);
             };
             Session.prototype.getPosition = function (args, scriptInfo) {
                 return args.position !== undefined ? args.position : scriptInfo.lineOffsetToPosition(args.line, args.offset);
@@ -115888,21 +116522,19 @@ var ts;
                 return this.getFileAndProjectWorker(args.file, args.projectFileName);
             };
             Session.prototype.getFileAndLanguageServiceForSyntacticOperation = function (args) {
-                // Since this is syntactic operation, there should always be project for the file
-                // we wouldnt have to ensure project but rather throw if we dont get project
                 var file = server.toNormalizedPath(args.file);
-                var project = this.getProject(args.projectFileName) || this.projectService.getDefaultProjectForFile(file, /*ensureProject*/ false);
+                var project = this.getProject(args.projectFileName) || this.projectService.getDefaultProjectForFile(file, false);
                 if (!project) {
                     return server.Errors.ThrowNoProject();
                 }
                 return {
                     file: file,
-                    languageService: project.getLanguageService(/*ensureSynchronized*/ false)
+                    languageService: project.getLanguageService(false)
                 };
             };
             Session.prototype.getFileAndProjectWorker = function (uncheckedFileName, projectFileName) {
                 var file = server.toNormalizedPath(uncheckedFileName);
-                var project = this.getProject(projectFileName) || this.projectService.getDefaultProjectForFile(file, /*ensureProject*/ true); // TODO: GH#18217
+                var project = this.getProject(projectFileName) || this.projectService.getDefaultProjectForFile(file, true);
                 return { file: file, project: project };
             };
             Session.prototype.getOutliningSpans = function (args, simplifiedResult) {
@@ -115990,7 +116622,6 @@ var ts;
                 var scriptInfo = this.projectService.getScriptInfoForNormalizedPath(file);
                 var startPosition = scriptInfo.lineOffsetToPosition(args.line, args.offset);
                 var endPosition = scriptInfo.lineOffsetToPosition(args.endLine, args.endOffset);
-                // TODO: avoid duplicate code (with formatonkey)
                 var edits = languageService.getFormattingEditsForRange(file, startPosition, endPosition, this.getFormatOptions(file));
                 if (!edits) {
                     return undefined;
@@ -116000,7 +116631,7 @@ var ts;
             Session.prototype.getFormattingEditsForRangeFull = function (args) {
                 var _a = this.getFileAndLanguageServiceForSyntacticOperation(args), file = _a.file, languageService = _a.languageService;
                 var options = args.options ? server.convertFormatOptions(args.options) : this.getFormatOptions(file);
-                return languageService.getFormattingEditsForRange(file, args.position, args.endPosition, options); // TODO: GH#18217
+                return languageService.getFormattingEditsForRange(file, args.position, args.endPosition, options);
             };
             Session.prototype.getFormattingEditsForDocumentFull = function (args) {
                 var _a = this.getFileAndLanguageServiceForSyntacticOperation(args), file = _a.file, languageService = _a.languageService;
@@ -116010,7 +116641,7 @@ var ts;
             Session.prototype.getFormattingEditsAfterKeystrokeFull = function (args) {
                 var _a = this.getFileAndLanguageServiceForSyntacticOperation(args), file = _a.file, languageService = _a.languageService;
                 var options = args.options ? server.convertFormatOptions(args.options) : this.getFormatOptions(file);
-                return languageService.getFormattingEditsAfterKeystroke(file, args.position, args.key, options); // TODO: GH#18217
+                return languageService.getFormattingEditsAfterKeystroke(file, args.position, args.key, options);
             };
             Session.prototype.getFormattingEditsAfterKeystroke = function (args) {
                 var _a = this.getFileAndLanguageServiceForSyntacticOperation(args), file = _a.file, languageService = _a.languageService;
@@ -116018,12 +116649,6 @@ var ts;
                 var position = scriptInfo.lineOffsetToPosition(args.line, args.offset);
                 var formatOptions = this.getFormatOptions(file);
                 var edits = languageService.getFormattingEditsAfterKeystroke(file, position, args.key, formatOptions);
-                // Check whether we should auto-indent. This will be when
-                // the position is on a line containing only whitespace.
-                // This should leave the edits returned from
-                // getFormattingEditsAfterKeystroke either empty or pertaining
-                // only to the previous line.  If all this is true, then
-                // add edits necessary to properly indent the current line.
                 if ((args.key === "\n") && ((!edits) || (edits.length === 0) || allEditsBeforePos(edits, position))) {
                     var _b = scriptInfo.getLineInfo(args.line), lineText = _b.lineText, absolutePosition = _b.absolutePosition;
                     if (lineText && lineText.search("\\S") < 0) {
@@ -116035,13 +116660,12 @@ var ts;
                                 hasIndent++;
                             }
                             else if (lineText.charAt(i) === "\t") {
-                                hasIndent += formatOptions.tabSize; // TODO: GH#18217
+                                hasIndent += formatOptions.tabSize;
                             }
                             else {
                                 break;
                             }
                         }
-                        // i points to the first non whitespace character
                         if (preferredIndent !== hasIndent) {
                             var firstNoWhiteSpacePosition = absolutePosition + i;
                             edits.push({
@@ -116074,7 +116698,6 @@ var ts;
                         if (completions.isMemberCompletion || ts.startsWith(entry.name.toLowerCase(), prefix.toLowerCase())) {
                             var name = entry.name, kind = entry.kind, kindModifiers = entry.kindModifiers, sortText = entry.sortText, insertText = entry.insertText, replacementSpan = entry.replacementSpan, hasAction = entry.hasAction, source = entry.source, isRecommended = entry.isRecommended;
                             var convertedSpan = replacementSpan ? _this.toLocationTextSpan(replacementSpan, scriptInfo) : undefined;
-                            // Use `hasAction || undefined` to avoid serializing `false`.
                             return { name: name, kind: kind, kindModifiers: kindModifiers, sortText: sortText, insertText: insertText, replacementSpan: convertedSpan, hasAction: hasAction || undefined, source: source, isRecommended: isRecommended };
                         }
                     }).sort(function (a, b) { return ts.compareStringsCaseSensitiveUI(a.name, b.name); });
@@ -116103,7 +116726,6 @@ var ts;
                 if (!info) {
                     return server.emptyArray;
                 }
-                // if specified a project, we only return affected file list in this project
                 var projects = args.projectFileName ? [this.projectService.findProject(args.projectFileName)] : info.containingProjects;
                 var symLinkedProjects = !args.projectFileName && this.projectService.getSymlinkedProjects(info);
                 return combineProjectOutput(info, function (path) { return _this.projectService.getScriptInfoForPath(path); }, symLinkedProjects ? { projects: projects, symLinkedProjects: symLinkedProjects } : projects, function (project, info) {
@@ -116159,7 +116781,7 @@ var ts;
                 var _this = this;
                 return ts.mapDefined(fileNames, function (uncheckedFileName) {
                     var fileName = server.toNormalizedPath(uncheckedFileName);
-                    var project = defaultProject || _this.projectService.getDefaultProjectForFile(fileName, /*ensureProject*/ false);
+                    var project = defaultProject || _this.projectService.getDefaultProjectForFile(fileName, false);
                     return project && { fileName: fileName, project: project };
                 });
             };
@@ -116181,7 +116803,7 @@ var ts;
                     this.changeSeq++;
                     this.projectService.applyChangesToFile(scriptInfo, [{
                             span: { start: start, length: end - start },
-                            newText: args.insertString // TODO: GH#18217
+                            newText: args.insertString
                         }]);
                 }
             };
@@ -116191,9 +116813,8 @@ var ts;
                 var info = this.projectService.getScriptInfoForNormalizedPath(file);
                 if (info) {
                     this.changeSeq++;
-                    // make sure no changes happen before this one is finished
                     if (info.reloadFromFile(tempFileName)) {
-                        this.doOutput(/*info*/ undefined, server.CommandNames.Reload, reqSeq, /*success*/ true);
+                        this.doOutput(undefined, server.CommandNames.Reload, reqSeq, true);
                     }
                 }
             };
@@ -116237,6 +116858,7 @@ var ts;
                     kind: tree.kind,
                     kindModifiers: tree.kindModifiers,
                     spans: tree.spans.map(function (span) { return _this.toLocationTextSpan(span, scriptInfo); }),
+                    nameSpan: tree.nameSpan && this.toLocationTextSpan(tree.nameSpan, scriptInfo),
                     childItems: ts.map(tree.childItems, function (item) { return _this.toLocationNavigationTree(item, scriptInfo); })
                 };
             };
@@ -116263,7 +116885,7 @@ var ts;
                         if (fileName && !file) {
                             return undefined;
                         }
-                        var navItems = project.getLanguageService().getNavigateToItems(args.searchValue, args.maxResultCount, fileName, /*excludeDts*/ project.isNonTsProject());
+                        var navItems = project.getLanguageService().getNavigateToItems(args.searchValue, args.maxResultCount, fileName, project.isNonTsProject());
                         if (!navItems) {
                             return server.emptyArray;
                         }
@@ -116290,17 +116912,15 @@ var ts;
                             }
                             return bakedItem;
                         });
-                    }, 
-                    /*comparer*/ undefined, areNavToItemsForTheSameLocation);
+                    }, undefined, areNavToItemsForTheSameLocation);
                 }
                 else {
                     return combineProjectOutput(fileName, function () { return undefined; }, projects, function (project, file) {
                         if (fileName && !file) {
                             return undefined;
                         }
-                        return project.getLanguageService().getNavigateToItems(args.searchValue, args.maxResultCount, fileName, /*excludeDts*/ project.isNonTsProject());
-                    }, 
-                    /*comparer*/ undefined, navigateToItemIsEqualTo);
+                        return project.getLanguageService().getNavigateToItems(args.searchValue, args.maxResultCount, fileName, project.isNonTsProject());
+                    }, undefined, navigateToItemIsEqualTo);
                 }
                 function navigateToItemIsEqualTo(a, b) {
                     if (a === b) {
@@ -116345,7 +116965,7 @@ var ts;
                     var _a = this.getStartAndEndPosition(args, scriptInfo), startPosition = _a.startPosition, endPosition = _a.endPosition;
                     textRange = { pos: startPosition, end: endPosition };
                 }
-                return { position: position, textRange: textRange }; // TODO: GH#18217
+                return { position: position, textRange: textRange };
                 function getPosition(loc) {
                     return loc.position !== undefined ? loc.position : scriptInfo.lineOffsetToPosition(loc.line, loc.offset);
                 }
@@ -116398,7 +117018,7 @@ var ts;
             };
             Session.prototype.getCodeFixes = function (args, simplifiedResult) {
                 var _this = this;
-                if (args.errorCodes.length === 0) { // TODO: GH#18217
+                if (args.errorCodes.length === 0) {
                     return undefined;
                 }
                 var _a = this.getFileAndProject(args), file = _a.file, project = _a.project;
@@ -116420,7 +117040,7 @@ var ts;
                 }
             };
             Session.prototype.applyCodeActionCommand = function (args) {
-                var commands = args.command; // They should be sending back the command we sent them.
+                var commands = args.command;
                 for (var _i = 0, _a = ts.toArray(commands); _i < _a.length; _i++) {
                     var command = _a[_i];
                     var project = this.getFileAndProject(command).project;
@@ -116435,7 +117055,6 @@ var ts;
                 }
                 else {
                     startPosition = scriptInfo.lineOffsetToPosition(args.startLine, args.startOffset);
-                    // save the result so we don't always recompute
                     args.startPosition = startPosition;
                 }
                 if (args.endPosition !== undefined) {
@@ -116457,20 +117076,10 @@ var ts;
             };
             Session.prototype.mapTextChangesToCodeEdits = function (project, textChanges) {
                 var _this = this;
-                return textChanges.map(function (change) { return _this.mapTextChangesToCodeEditsUsingScriptinfo(change, project.getScriptInfoForNormalizedPath(server.toNormalizedPath(change.fileName))); });
-            };
-            Session.prototype.mapTextChangesToCodeEditsUsingScriptinfo = function (textChanges, scriptInfo) {
-                var _this = this;
-                ts.Debug.assert(!!textChanges.isNewFile === !scriptInfo);
-                if (scriptInfo) {
-                    return {
-                        fileName: textChanges.fileName,
-                        textChanges: textChanges.textChanges.map(function (textChange) { return _this.convertTextChangeToCodeEdit(textChange, scriptInfo); })
-                    };
-                }
-                else {
-                    return this.convertNewFileTextChangeToCodeEdit(textChanges);
-                }
+                return textChanges.map(function (change) {
+                    var path = server.normalizedPathToPath(server.toNormalizedPath(change.fileName), _this.host.getCurrentDirectory(), function (fileName) { return _this.getCanonicalFileName(fileName); });
+                    return mapTextChangesToCodeEdits(change, project.getSourceFileOrConfigFile(path));
+                });
             };
             Session.prototype.convertTextChangeToCodeEdit = function (change, scriptInfo) {
                 return {
@@ -116479,12 +117088,6 @@ var ts;
                     newText: change.newText ? change.newText : ""
                 };
             };
-            Session.prototype.convertNewFileTextChangeToCodeEdit = function (textChanges) {
-                ts.Debug.assert(textChanges.textChanges.length === 1);
-                var change = ts.first(textChanges.textChanges);
-                ts.Debug.assert(change.span.start === 0 && change.span.length === 0);
-                return { fileName: textChanges.fileName, textChanges: [{ start: { line: 0, offset: 0 }, end: { line: 0, offset: 0 }, newText: change.newText }] };
-            };
             Session.prototype.getBraceMatching = function (args, simplifiedResult) {
                 var _this = this;
                 var _a = this.getFileAndLanguageServiceForSyntacticOperation(args), file = _a.file, languageService = _a.languageService;
@@ -116501,31 +117104,29 @@ var ts;
                 if (this.suppressDiagnosticEvents) {
                     return;
                 }
-                var _a = this.getProjectInfoWorker(fileName, /*projectFileName*/ undefined, /*needFileNameList*/ true, /*excludeConfigFiles*/ true), fileNames = _a.fileNames, languageServiceDisabled = _a.languageServiceDisabled;
+                var _a = this.getProjectInfoWorker(fileName, undefined, true, true), fileNames = _a.fileNames, languageServiceDisabled = _a.languageServiceDisabled;
                 if (languageServiceDisabled) {
                     return;
                 }
-                // No need to analyze lib.d.ts
-                var fileNamesInProject = fileNames.filter(function (value) { return !ts.stringContains(value, "lib.d.ts"); }); // TODO: GH#18217
+                var fileNamesInProject = fileNames.filter(function (value) { return !ts.stringContains(value, "lib.d.ts"); });
                 if (fileNamesInProject.length === 0) {
                     return;
                 }
-                // Sort the file name list to make the recently touched files come first
                 var highPriorityFiles = [];
                 var mediumPriorityFiles = [];
                 var lowPriorityFiles = [];
                 var veryLowPriorityFiles = [];
                 var normalizedFileName = server.toNormalizedPath(fileName);
-                var project = this.projectService.getDefaultProjectForFile(normalizedFileName, /*ensureProject*/ true);
+                var project = this.projectService.getDefaultProjectForFile(normalizedFileName, true);
                 for (var _i = 0, fileNamesInProject_1 = fileNamesInProject; _i < fileNamesInProject_1.length; _i++) {
                     var fileNameInProject = fileNamesInProject_1[_i];
                     if (this.getCanonicalFileName(fileNameInProject) === this.getCanonicalFileName(fileName)) {
                         highPriorityFiles.push(fileNameInProject);
                     }
                     else {
-                        var info = this.projectService.getScriptInfo(fileNameInProject); // TODO: GH#18217
+                        var info = this.projectService.getScriptInfo(fileNameInProject);
                         if (!info.isScriptOpen()) {
-                            if (ts.fileExtensionIs(fileNameInProject, ".d.ts" /* Dts */)) {
+                            if (ts.fileExtensionIs(fileNameInProject, ".d.ts")) {
                                 veryLowPriorityFiles.push(fileNameInProject);
                             }
                             else {
@@ -116539,9 +117140,7 @@ var ts;
                 }
                 var sortedFiles = highPriorityFiles.concat(mediumPriorityFiles, lowPriorityFiles, veryLowPriorityFiles);
                 var checkList = sortedFiles.map(function (fileName) { return ({ fileName: fileName, project: project }); });
-                // Project level error analysis runs on background files too, therefore
-                // doesn't require the file to be opened
-                this.updateErrorCheck(next, checkList, delay, /*requireOpen*/ false);
+                this.updateErrorCheck(next, checkList, delay, false);
             };
             Session.prototype.getCanonicalFileName = function (fileName) {
                 var name = this.host.useCaseSensitiveFileNames ? fileName : fileName.toLowerCase();
@@ -116567,7 +117166,7 @@ var ts;
             };
             Session.prototype.resetCurrentRequest = function (requestId) {
                 ts.Debug.assert(this.currentRequestId === requestId);
-                this.currentRequestId = undefined; // TODO: GH#18217
+                this.currentRequestId = undefined;
                 this.cancellationToken.resetRequest(requestId);
             };
             Session.prototype.executeWithRequestId = function (requestId, f) {
@@ -116586,7 +117185,7 @@ var ts;
                 }
                 else {
                     this.logger.msg("Unrecognized JSON command:" + server.stringifyIndented(request), server.Msg.Err);
-                    this.doOutput(/*info*/ undefined, server.CommandNames.Unknown, request.seq, /*success*/ false, "Unrecognized JSON command: " + request.command);
+                    this.doOutput(undefined, server.CommandNames.Unknown, request.seq, false, "Unrecognized JSON command: " + request.command);
                     return { responseRequired: false };
                 }
             };
@@ -116613,22 +117212,19 @@ var ts;
                         }
                     }
                     if (response) {
-                        this.doOutput(response, request.command, request.seq, /*success*/ true);
+                        this.doOutput(response, request.command, request.seq, true);
                     }
                     else if (responseRequired) {
-                        this.doOutput(/*info*/ undefined, request.command, request.seq, /*success*/ false, "No content available.");
+                        this.doOutput(undefined, request.command, request.seq, false, "No content available.");
                     }
                 }
                 catch (err) {
                     if (err instanceof ts.OperationCanceledException) {
-                        // Handle cancellation exceptions
-                        this.doOutput({ canceled: true }, request.command, request.seq, /*success*/ true);
+                        this.doOutput({ canceled: true }, request.command, request.seq, true);
                         return;
                     }
                     this.logError(err, message);
-                    this.doOutput(
-                    /*info*/ undefined, request ? request.command : server.CommandNames.Unknown, request ? request.seq : 0, 
-                    /*success*/ false, "Error processing request. " + err.message + "\n" + err.stack);
+                    this.doOutput(undefined, request ? request.command : server.CommandNames.Unknown, request ? request.seq : 0, false, "Error processing request. " + err.message + "\n" + err.stack);
                 }
             };
             Session.prototype.getFormatOptions = function (file) {
@@ -116640,7 +117236,31 @@ var ts;
             return Session;
         }());
         server.Session = Session;
-        /* @internal */ // Exported only for tests
+        function mapTextChangesToCodeEdits(textChanges, sourceFile) {
+            ts.Debug.assert(!!textChanges.isNewFile === !sourceFile);
+            if (sourceFile) {
+                return {
+                    fileName: textChanges.fileName,
+                    textChanges: textChanges.textChanges.map(function (textChange) { return convertTextChangeToCodeEdit(textChange, sourceFile); }),
+                };
+            }
+            else {
+                return convertNewFileTextChangeToCodeEdit(textChanges);
+            }
+        }
+        function convertTextChangeToCodeEdit(change, sourceFile) {
+            return {
+                start: convertToLocation(sourceFile.getLineAndCharacterOfPosition(change.span.start)),
+                end: convertToLocation(sourceFile.getLineAndCharacterOfPosition(change.span.start + change.span.length)),
+                newText: change.newText ? change.newText : "",
+            };
+        }
+        function convertNewFileTextChangeToCodeEdit(textChanges) {
+            ts.Debug.assert(textChanges.textChanges.length === 1);
+            var change = ts.first(textChanges.textChanges);
+            ts.Debug.assert(change.span.start === 0 && change.span.length === 0);
+            return { fileName: textChanges.fileName, textChanges: [{ start: { line: 0, offset: 0 }, end: { line: 0, offset: 0 }, newText: change.newText }] };
+        }
         function getLocationInNewDocument(oldText, renameFilename, renameLocation, edits) {
             var newText = applyEdits(oldText, renameFilename, edits);
             var _a = ts.computeLineAndCharacterOfPosition(ts.computeLineStarts(newText), renameLocation), line = _a.line, character = _a.character;
@@ -116648,21 +117268,20 @@ var ts;
         }
         server.getLocationInNewDocument = getLocationInNewDocument;
         function applyEdits(text, textFilename, edits) {
-            for (var _i = 0, edits_3 = edits; _i < edits_3.length; _i++) {
-                var _a = edits_3[_i], fileName = _a.fileName, textChanges_4 = _a.textChanges;
+            for (var _i = 0, edits_2 = edits; _i < edits_2.length; _i++) {
+                var _a = edits_2[_i], fileName = _a.fileName, textChanges_1 = _a.textChanges;
                 if (fileName !== textFilename) {
                     continue;
                 }
-                for (var i = textChanges_4.length - 1; i >= 0; i--) {
-                    var _b = textChanges_4[i], newText = _b.newText, _c = _b.span, start = _c.start, length_6 = _c.length;
-                    text = text.slice(0, start) + newText + text.slice(start + length_6);
+                for (var i = textChanges_1.length - 1; i >= 0; i--) {
+                    var _b = textChanges_1[i], newText = _b.newText, _c = _b.span, start = _c.start, length_1 = _c.length;
+                    text = text.slice(0, start) + newText + text.slice(start + length_1);
                 }
             }
             return text;
         }
     })(server = ts.server || (ts.server = {}));
 })(ts || (ts = {}));
-/*@internal*/
 var ts;
 (function (ts) {
     var server;
@@ -116677,12 +117296,12 @@ var ts;
             CharRangeSection[CharRangeSection["End"] = 4] = "End";
             CharRangeSection[CharRangeSection["PostEnd"] = 5] = "PostEnd";
         })(CharRangeSection || (CharRangeSection = {}));
-        var EditWalker = /** @class */ (function () {
+        var EditWalker = (function () {
             function EditWalker() {
                 this.goSubtree = true;
                 this.lineIndex = new LineIndex();
                 this.endBranch = [];
-                this.state = 2 /* Entire */;
+                this.state = 2;
                 this.initialText = "";
                 this.trailingText = "";
                 this.lineIndex.root = new LineNode();
@@ -116728,7 +117347,6 @@ var ts;
                 if (lastZeroCount) {
                     branchParent.remove(lastZeroCount);
                 }
-                // path at least length two (root and leaf)
                 var leafNode = this.startPath[this.startPath.length - 1];
                 if (lines.length > 0) {
                     leafNode.text = lines[0];
@@ -116763,7 +117381,6 @@ var ts;
                 }
                 else {
                     var insertionNode = this.startPath[this.startPath.length - 2];
-                    // no content for leaf node, so delete it
                     insertionNode.remove(leafNode);
                     for (var j = this.startPath.length - 2; j >= 0; j--) {
                         this.startPath[j].updateCounts();
@@ -116772,20 +117389,15 @@ var ts;
                 return this.lineIndex;
             };
             EditWalker.prototype.post = function (_relativeStart, _relativeLength, lineCollection) {
-                // have visited the path for start of range, now looking for end
-                // if range is on single line, we will never make this state transition
                 if (lineCollection === this.lineCollectionAtBranch) {
-                    this.state = 4 /* End */;
+                    this.state = 4;
                 }
-                // always pop stack because post only called when child has been visited
                 this.stack.pop();
             };
             EditWalker.prototype.pre = function (_relativeStart, _relativeLength, lineCollection, _parent, nodeType) {
-                // currentNode corresponds to parent, but in the new tree
                 var currentNode = this.stack[this.stack.length - 1];
-                if ((this.state === 2 /* Entire */) && (nodeType === 1 /* Start */)) {
-                    // if range is on single line, we will never make this state transition
-                    this.state = 1 /* Start */;
+                if ((this.state === 2) && (nodeType === 1)) {
+                    this.state = 1;
                     this.branchNode = currentNode;
                     this.lineCollectionAtBranch = lineCollection;
                 }
@@ -116798,14 +117410,14 @@ var ts;
                         return new LineNode();
                 }
                 switch (nodeType) {
-                    case 0 /* PreStart */:
+                    case 0:
                         this.goSubtree = false;
-                        if (this.state !== 4 /* End */) {
+                        if (this.state !== 4) {
                             currentNode.add(lineCollection);
                         }
                         break;
-                    case 1 /* Start */:
-                        if (this.state === 4 /* End */) {
+                    case 1:
+                        if (this.state === 4) {
                             this.goSubtree = false;
                         }
                         else {
@@ -116814,8 +117426,8 @@ var ts;
                             this.startPath.push(child);
                         }
                         break;
-                    case 2 /* Entire */:
-                        if (this.state !== 4 /* End */) {
+                    case 2:
+                        if (this.state !== 4) {
                             child = fresh(lineCollection);
                             currentNode.add(child);
                             this.startPath.push(child);
@@ -116828,11 +117440,11 @@ var ts;
                             }
                         }
                         break;
-                    case 3 /* Mid */:
+                    case 3:
                         this.goSubtree = false;
                         break;
-                    case 4 /* End */:
-                        if (this.state !== 4 /* End */) {
+                    case 4:
+                        if (this.state !== 4) {
                             this.goSubtree = false;
                         }
                         else {
@@ -116843,9 +117455,9 @@ var ts;
                             }
                         }
                         break;
-                    case 5 /* PostEnd */:
+                    case 5:
                         this.goSubtree = false;
-                        if (this.state !== 1 /* Start */) {
+                        if (this.state !== 1) {
                             currentNode.add(lineCollection);
                         }
                         break;
@@ -116854,24 +117466,21 @@ var ts;
                     this.stack.push(child);
                 }
             };
-            // just gather text from the leaves
             EditWalker.prototype.leaf = function (relativeStart, relativeLength, ll) {
-                if (this.state === 1 /* Start */) {
+                if (this.state === 1) {
                     this.initialText = ll.text.substring(0, relativeStart);
                 }
-                else if (this.state === 2 /* Entire */) {
+                else if (this.state === 2) {
                     this.initialText = ll.text.substring(0, relativeStart);
                     this.trailingText = ll.text.substring(relativeStart + relativeLength);
                 }
                 else {
-                    // state is CharRangeSection.End
                     this.trailingText = ll.text.substring(relativeStart + relativeLength);
                 }
             };
             return EditWalker;
         }());
-        // text change information
-        var TextChange = /** @class */ (function () {
+        var TextChange = (function () {
             function TextChange(pos, deleteLen, insertedText) {
                 this.pos = pos;
                 this.deleteLen = deleteLen;
@@ -116882,11 +117491,11 @@ var ts;
             };
             return TextChange;
         }());
-        var ScriptVersionCache = /** @class */ (function () {
+        var ScriptVersionCache = (function () {
             function ScriptVersionCache() {
                 this.changes = [];
                 this.versions = new Array(ScriptVersionCache.maxVersions);
-                this.minVersion = 0; // no versions earlier than min version will maintain change history
+                this.minVersion = 0;
                 this.currentVersion = 0;
             }
             ScriptVersionCache.prototype.versionToIndex = function (version) {
@@ -116898,7 +117507,6 @@ var ts;
             ScriptVersionCache.prototype.currentVersionToIndex = function () {
                 return this.currentVersion % ScriptVersionCache.maxVersions;
             };
-            // REVIEW: can optimize by coalescing simple edits
             ScriptVersionCache.prototype.edit = function (pos, deleteLen, insertedText) {
                 this.changes.push(new TextChange(pos, deleteLen, insertedText));
                 if (this.changes.length > ScriptVersionCache.changeNumberThreshold ||
@@ -116949,7 +117557,7 @@ var ts;
                     if (oldVersion >= this.minVersion) {
                         var textChangeRanges = [];
                         for (var i = oldVersion + 1; i <= newVersion; i++) {
-                            var snap = this.versions[this.versionToIndex(i)]; // TODO: GH#18217
+                            var snap = this.versions[this.versionToIndex(i)];
                             for (var _i = 0, _a = snap.changesSincePreviousVersion; _i < _a.length; _i++) {
                                 var textChange = _a[_i];
                                 textChangeRanges.push(textChange.getTextChangeRange());
@@ -116979,7 +117587,7 @@ var ts;
             return ScriptVersionCache;
         }());
         server.ScriptVersionCache = ScriptVersionCache;
-        var LineIndexSnapshot = /** @class */ (function () {
+        var LineIndexSnapshot = (function () {
             function LineIndexSnapshot(version, cache, index, changesSincePreviousVersion) {
                 if (changesSincePreviousVersion === void 0) { changesSincePreviousVersion = server.emptyArray; }
                 this.version = version;
@@ -117005,10 +117613,8 @@ var ts;
             };
             return LineIndexSnapshot;
         }());
-        /* @internal */
-        var LineIndex = /** @class */ (function () {
+        var LineIndex = (function () {
             function LineIndex() {
-                // set this to true to check each edit for accuracy
                 this.checkEdits = false;
             }
             LineIndex.prototype.absolutePositionOfStartOfLine = function (oneBasedLine) {
@@ -117080,12 +117686,12 @@ var ts;
             };
             LineIndex.prototype.edit = function (pos, deleteLength, newText) {
                 if (this.root.charCount() === 0) {
-                    ts.Debug.assert(deleteLength === 0); // Can't delete from empty document
+                    ts.Debug.assert(deleteLength === 0);
                     if (newText !== undefined) {
                         this.load(LineIndex.linesFromText(newText).lines);
                         return this;
                     }
-                    return undefined; // TODO: GH#18217
+                    return undefined;
                 }
                 else {
                     var checkText = void 0;
@@ -117096,7 +117702,6 @@ var ts;
                     var walker = new EditWalker();
                     var suppressTrailingText = false;
                     if (pos >= this.root.charCount()) {
-                        // insert at end
                         pos = this.root.charCount() - 1;
                         var endString = this.getText(pos, 1);
                         if (newText) {
@@ -117109,13 +117714,10 @@ var ts;
                         suppressTrailingText = true;
                     }
                     else if (deleteLength > 0) {
-                        // check whether last characters deleted are line break
                         var e = pos + deleteLength;
                         var _a = this.positionToColumnAndLineText(e), zeroBasedColumn = _a.zeroBasedColumn, lineText = _a.lineText;
                         if (zeroBasedColumn === 0) {
-                            // move range end just past line that will merge with previous line
-                            deleteLength += lineText.length; // TODO: GH#18217
-                            // store text by appending to end of insertedText
+                            deleteLength += lineText.length;
                             newText = newText ? newText + lineText : lineText;
                         }
                     }
@@ -117163,7 +117765,7 @@ var ts;
             return LineIndex;
         }());
         server.LineIndex = LineIndex;
-        var LineNode = /** @class */ (function () {
+        var LineNode = (function () {
             function LineNode(children) {
                 if (children === void 0) { children = []; }
                 this.children = children;
@@ -117206,26 +117808,22 @@ var ts;
                 }
             };
             LineNode.prototype.walk = function (rangeStart, rangeLength, walkFns) {
-                // assume (rangeStart < this.totalChars) && (rangeLength <= this.totalChars)
                 var childIndex = 0;
                 var childCharCount = this.children[childIndex].charCount();
-                // find sub-tree containing start
                 var adjustedStart = rangeStart;
                 while (adjustedStart >= childCharCount) {
-                    this.skipChild(adjustedStart, rangeLength, childIndex, walkFns, 0 /* PreStart */);
+                    this.skipChild(adjustedStart, rangeLength, childIndex, walkFns, 0);
                     adjustedStart -= childCharCount;
                     childIndex++;
                     childCharCount = this.children[childIndex].charCount();
                 }
-                // Case I: both start and end of range in same subtree
                 if ((adjustedStart + rangeLength) <= childCharCount) {
-                    if (this.execWalk(adjustedStart, rangeLength, walkFns, childIndex, 2 /* Entire */)) {
+                    if (this.execWalk(adjustedStart, rangeLength, walkFns, childIndex, 2)) {
                         return;
                     }
                 }
                 else {
-                    // Case II: start and end of range in different subtrees (possibly with subtrees in the middle)
-                    if (this.execWalk(adjustedStart, childCharCount - adjustedStart, walkFns, childIndex, 1 /* Start */)) {
+                    if (this.execWalk(adjustedStart, childCharCount - adjustedStart, walkFns, childIndex, 1)) {
                         return;
                     }
                     var adjustedLength = rangeLength - (childCharCount - adjustedStart);
@@ -117233,7 +117831,7 @@ var ts;
                     var child = this.children[childIndex];
                     childCharCount = child.charCount();
                     while (adjustedLength > childCharCount) {
-                        if (this.execWalk(0, childCharCount, walkFns, childIndex, 3 /* Mid */)) {
+                        if (this.execWalk(0, childCharCount, walkFns, childIndex, 3)) {
                             return;
                         }
                         adjustedLength -= childCharCount;
@@ -117241,26 +117839,22 @@ var ts;
                         childCharCount = this.children[childIndex].charCount();
                     }
                     if (adjustedLength > 0) {
-                        if (this.execWalk(0, adjustedLength, walkFns, childIndex, 4 /* End */)) {
+                        if (this.execWalk(0, adjustedLength, walkFns, childIndex, 4)) {
                             return;
                         }
                     }
                 }
-                // Process any subtrees after the one containing range end
                 if (walkFns.pre) {
                     var clen = this.children.length;
                     if (childIndex < (clen - 1)) {
                         for (var ej = childIndex + 1; ej < clen; ej++) {
-                            this.skipChild(0, 0, ej, walkFns, 5 /* PostEnd */);
+                            this.skipChild(0, 0, ej, walkFns, 5);
                         }
                     }
                 }
             };
-            // Input position is relative to the start of this node.
-            // Output line number is absolute.
             LineNode.prototype.charOffsetToLineInfo = function (lineNumberAccumulator, relativePosition) {
                 if (this.children.length === 0) {
-                    // Root node might have no children if this is an empty document.
                     return { oneBasedLine: lineNumberAccumulator, zeroBasedColumn: relativePosition, lineText: undefined };
                 }
                 for (var _i = 0, _a = this.children; _i < _a.length; _i++) {
@@ -117278,15 +117872,9 @@ var ts;
                         lineNumberAccumulator += child.lineCount();
                     }
                 }
-                // Skipped all children
                 var leaf = this.lineNumberToInfo(this.lineCount(), 0).leaf;
                 return { oneBasedLine: this.lineCount(), zeroBasedColumn: leaf ? leaf.charCount() : 0, lineText: undefined };
             };
-            /**
-             * Input line number is relative to the start of this node.
-             * Output line number is relative to the child.
-             * positionAccumulator will be an absolute position once relativeLineNumber reaches 0.
-             */
             LineNode.prototype.lineNumberToInfo = function (relativeOneBasedLine, positionAccumulator) {
                 for (var _i = 0, _a = this.children; _i < _a.length; _i++) {
                     var child = _a[_i];
@@ -117336,7 +117924,6 @@ var ts;
                 var childIndex = this.findChildIndex(child);
                 var clen = this.children.length;
                 var nodeCount = nodes.length;
-                // if child is last and there is more room and only one node to place, place it
                 if ((clen < lineCollectionCapacity) && (childIndex === (clen - 1)) && (nodeCount === 1)) {
                     this.add(nodes[0]);
                     this.updateCounts();
@@ -117385,7 +117972,6 @@ var ts;
                     return splitNodes;
                 }
             };
-            // assume there is room for the item; return true if more room
             LineNode.prototype.add = function (collection) {
                 this.children.push(collection);
                 ts.Debug.assert(this.children.length <= lineCollectionCapacity);
@@ -117398,7 +117984,7 @@ var ts;
             };
             return LineNode;
         }());
-        var LineLeaf = /** @class */ (function () {
+        var LineLeaf = (function () {
             function LineLeaf(text) {
                 this.text = text;
             }
@@ -117418,3 +118004,6 @@ var ts;
         }());
     })(server = ts.server || (ts.server = {}));
 })(ts || (ts = {}));
+//# sourceMappingURL=server.js.map
+// Workaround file, please delete once tsbuild understands it's not safe to skip this container
+//# sourceMappingURL=tsserverlibrary.js.map
\ No newline at end of file
diff --git a/lib/typescript.d.ts b/lib/typescript.d.ts
index 51bd949ae4d..acbcabf5bef 100644
--- a/lib/typescript.d.ts
+++ b/lib/typescript.d.ts
@@ -715,10 +715,14 @@ declare namespace ts {
         kind: SyntaxKind.ThisType;
     }
     type FunctionOrConstructorTypeNode = FunctionTypeNode | ConstructorTypeNode;
-    interface FunctionTypeNode extends TypeNode, SignatureDeclarationBase {
+    interface FunctionOrConstructorTypeNodeBase extends TypeNode, SignatureDeclarationBase {
+        kind: SyntaxKind.FunctionType | SyntaxKind.ConstructorType;
+        type: TypeNode;
+    }
+    interface FunctionTypeNode extends FunctionOrConstructorTypeNodeBase {
         kind: SyntaxKind.FunctionType;
     }
-    interface ConstructorTypeNode extends TypeNode, SignatureDeclarationBase {
+    interface ConstructorTypeNode extends FunctionOrConstructorTypeNodeBase {
         kind: SyntaxKind.ConstructorType;
     }
     interface NodeWithTypeArguments extends TypeNode {
@@ -1648,6 +1652,7 @@ declare namespace ts {
         moduleName?: string;
         referencedFiles: ReadonlyArray<FileReference>;
         typeReferenceDirectives: ReadonlyArray<FileReference>;
+        libReferenceDirectives: ReadonlyArray<FileReference>;
         languageVariant: LanguageVariant;
         isDeclarationFile: boolean;
         /**
@@ -1669,11 +1674,14 @@ declare namespace ts {
     interface InputFiles extends Node {
         kind: SyntaxKind.InputFiles;
         javascriptText: string;
+        javascriptMapText?: string;
         declarationText: string;
+        declarationMapText?: string;
     }
     interface UnparsedSource extends Node {
         kind: SyntaxKind.UnparsedSource;
         text: string;
+        sourceMapText?: string;
     }
     interface JsonSourceFile extends SourceFile {
         statements: NodeArray<JsonObjectExpressionStatement>;
@@ -2656,6 +2664,9 @@ declare namespace ts {
         resolveTypeReferenceDirectives?(typeReferenceDirectiveNames: string[], containingFile: string): ResolvedTypeReferenceDirective[];
         getEnvironmentVariable?(name: string): string | undefined;
         createHash?(data: string): string;
+        getModifiedTime?(fileName: string): Date;
+        setModifiedTime?(fileName: string, date: Date): void;
+        deleteFile?(fileName: string): void;
     }
     interface SourceMapRange extends TextRange {
         source?: SourceMapSource;
@@ -2876,6 +2887,10 @@ declare namespace ts {
         omitTrailingSemicolon?: boolean;
         noEmitHelpers?: boolean;
     }
+    interface GetEffectiveTypeRootsHost {
+        directoryExists?(directoryName: string): boolean;
+        getCurrentDirectory?(): string;
+    }
     /** @deprecated See comment on SymbolWriter */
     interface SymbolTracker {
         trackSymbol?(symbol: Symbol, enclosingDeclaration?: Node, meaning?: SymbolFlags): void;
@@ -3006,6 +3021,8 @@ declare namespace ts {
         getDirectories(path: string): string[];
         readDirectory(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
         getModifiedTime?(path: string): Date;
+        setModifiedTime?(path: string, time: Date): void;
+        deleteFile?(path: string): void;
         /**
          * A good implementation is node.js' `crypto.createHash`. (https://nodejs.org/api/crypto.html#crypto_crypto_createhash_algorithm)
          */
@@ -3371,6 +3388,7 @@ declare namespace ts {
     function isEnumMember(node: Node): node is EnumMember;
     function isSourceFile(node: Node): node is SourceFile;
     function isBundle(node: Node): node is Bundle;
+    function isUnparsedSource(node: Node): node is UnparsedSource;
     function isJSDocTypeExpression(node: Node): node is JSDocTypeExpression;
     function isJSDocAllType(node: JSDocAllType): node is JSDocAllType;
     function isJSDocUnknownType(node: Node): node is JSDocUnknownType;
@@ -3467,10 +3485,6 @@ declare namespace ts {
     function updateSourceFile(sourceFile: SourceFile, newText: string, textChangeRange: TextChangeRange, aggressiveChecks?: boolean): SourceFile;
 }
 declare namespace ts {
-    interface GetEffectiveTypeRootsHost {
-        directoryExists?(directoryName: string): boolean;
-        getCurrentDirectory?(): string;
-    }
     function getEffectiveTypeRoots(options: CompilerOptions, host: GetEffectiveTypeRootsHost): string[] | undefined;
     /**
      * @param {string | undefined} containingFile - file that contains type reference directive, can be undefined if containing file is unknown.
@@ -3801,7 +3815,7 @@ declare namespace ts {
     function updateSpreadAssignment(node: SpreadAssignment, expression: Expression): SpreadAssignment;
     function createEnumMember(name: string | PropertyName, initializer?: Expression): EnumMember;
     function updateEnumMember(node: EnumMember, name: PropertyName, initializer: Expression | undefined): EnumMember;
-    function updateSourceFileNode(node: SourceFile, statements: ReadonlyArray<Statement>, isDeclarationFile?: boolean, referencedFiles?: SourceFile["referencedFiles"], typeReferences?: SourceFile["typeReferenceDirectives"], hasNoDefaultLib?: boolean): SourceFile;
+    function updateSourceFileNode(node: SourceFile, statements: ReadonlyArray<Statement>, isDeclarationFile?: boolean, referencedFiles?: SourceFile["referencedFiles"], typeReferences?: SourceFile["typeReferenceDirectives"], hasNoDefaultLib?: boolean, libReferences?: SourceFile["libReferenceDirectives"]): SourceFile;
     /**
      * Creates a shallow, memberwise clone of a node for mutation.
      */
@@ -3826,8 +3840,8 @@ declare namespace ts {
     function createCommaList(elements: ReadonlyArray<Expression>): CommaListExpression;
     function updateCommaList(node: CommaListExpression, elements: ReadonlyArray<Expression>): CommaListExpression;
     function createBundle(sourceFiles: ReadonlyArray<SourceFile>, prepends?: ReadonlyArray<UnparsedSource | InputFiles>): Bundle;
-    function createUnparsedSourceFile(text: string): UnparsedSource;
-    function createInputFiles(javascript: string, declaration: string): InputFiles;
+    function createUnparsedSourceFile(text: string, map?: string): UnparsedSource;
+    function createInputFiles(javascript: string, declaration: string, javascriptMapText?: string, declarationMapText?: string): InputFiles;
     function updateBundle(node: Bundle, sourceFiles: ReadonlyArray<SourceFile>, prepends?: ReadonlyArray<UnparsedSource>): Bundle;
     function createImmediatelyInvokedFunctionExpression(statements: ReadonlyArray<Statement>): CallExpression;
     function createImmediatelyInvokedFunctionExpression(statements: ReadonlyArray<Statement>, param: ParameterDeclaration, paramValue: Expression): CallExpression;
@@ -4048,6 +4062,10 @@ declare namespace ts {
      * @returns A 'Program' object.
      */
     function createProgram(rootNames: ReadonlyArray<string>, options: CompilerOptions, host?: CompilerHost, oldProgram?: Program, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>): Program;
+    /**
+     * Returns the target config filename of a project reference
+     */
+    function resolveProjectReferencePath(host: CompilerHost, ref: ProjectReference): string | undefined;
 }
 declare namespace ts {
     interface EmitOutput {
@@ -4467,6 +4485,7 @@ declare namespace ts {
     interface PreProcessedFileInfo {
         referencedFiles: FileReference[];
         typeReferenceDirectives: FileReference[];
+        libReferenceDirectives: FileReference[];
         importedFiles: FileReference[];
         ambientExternalModules?: string[];
         isLibFile: boolean;
@@ -4651,6 +4670,7 @@ declare namespace ts {
          * There will be more than one if this is the result of merging.
          */
         spans: TextSpan[];
+        nameSpan: TextSpan | undefined;
         /** Present if non-empty */
         childItems?: NavigationTree[];
     }
diff --git a/lib/typescript.js b/lib/typescript.js
index 84491873e2b..3c2725eeda5 100644
--- a/lib/typescript.js
+++ b/lib/typescript.js
@@ -13,6 +13,1978 @@ See the Apache Version 2.0 License for specific language governing permissions
 and limitations under the License.
 ***************************************************************************** */
 
+"use strict";"use strict";
+/*@internal*/
+var ts;
+(function (ts) {
+    /** Gets a timestamp with (at least) ms resolution */
+    ts.timestamp = typeof performance !== "undefined" && performance.now ? function () { return performance.now(); } : Date.now ? Date.now : function () { return +(new Date()); };
+})(ts || (ts = {}));
+/*@internal*/
+/** Performance measurements for the compiler. */
+(function (ts) {
+    var performance;
+    (function (performance) {
+        // NOTE: cannot use ts.noop as core.ts loads after this
+        var profilerEvent = typeof onProfilerEvent === "function" && onProfilerEvent.profiler === true ? onProfilerEvent : function () { };
+        var enabled = false;
+        var profilerStart = 0;
+        var counts;
+        var marks;
+        var measures;
+        /**
+         * Marks a performance event.
+         *
+         * @param markName The name of the mark.
+         */
+        function mark(markName) {
+            if (enabled) {
+                marks.set(markName, ts.timestamp());
+                counts.set(markName, (counts.get(markName) || 0) + 1);
+                profilerEvent(markName);
+            }
+        }
+        performance.mark = mark;
+        /**
+         * Adds a performance measurement with the specified name.
+         *
+         * @param measureName The name of the performance measurement.
+         * @param startMarkName The name of the starting mark. If not supplied, the point at which the
+         *      profiler was enabled is used.
+         * @param endMarkName The name of the ending mark. If not supplied, the current timestamp is
+         *      used.
+         */
+        function measure(measureName, startMarkName, endMarkName) {
+            if (enabled) {
+                var end = endMarkName && marks.get(endMarkName) || ts.timestamp();
+                var start = startMarkName && marks.get(startMarkName) || profilerStart;
+                measures.set(measureName, (measures.get(measureName) || 0) + (end - start));
+            }
+        }
+        performance.measure = measure;
+        /**
+         * Gets the number of times a marker was encountered.
+         *
+         * @param markName The name of the mark.
+         */
+        function getCount(markName) {
+            return counts && counts.get(markName) || 0;
+        }
+        performance.getCount = getCount;
+        /**
+         * Gets the total duration of all measurements with the supplied name.
+         *
+         * @param measureName The name of the measure whose durations should be accumulated.
+         */
+        function getDuration(measureName) {
+            return measures && measures.get(measureName) || 0;
+        }
+        performance.getDuration = getDuration;
+        /**
+         * Iterate over each measure, performing some action
+         *
+         * @param cb The action to perform for each measure
+         */
+        function forEachMeasure(cb) {
+            measures.forEach(function (measure, key) {
+                cb(key, measure);
+            });
+        }
+        performance.forEachMeasure = forEachMeasure;
+        /** Enables (and resets) performance measurements for the compiler. */
+        function enable() {
+            counts = ts.createMap();
+            marks = ts.createMap();
+            measures = ts.createMap();
+            enabled = true;
+            profilerStart = ts.timestamp();
+        }
+        performance.enable = enable;
+        /** Disables performance measurements for the compiler. */
+        function disable() {
+            enabled = false;
+        }
+        performance.disable = disable;
+    })(performance = ts.performance || (ts.performance = {}));
+})(ts || (ts = {}));
+var ts;
+(function (ts) {
+    // WARNING: The script `configureNightly.ts` uses a regexp to parse out these values.
+    // If changing the text in this section, be sure to test `configureNightly` too.
+    ts.versionMajorMinor = "3.0";
+    /** The version of the TypeScript compiler release */
+    ts.version = ts.versionMajorMinor + ".0-dev";
+})(ts || (ts = {}));
+/* @internal */
+(function (ts) {
+    var Comparison;
+    (function (Comparison) {
+        Comparison[Comparison["LessThan"] = -1] = "LessThan";
+        Comparison[Comparison["EqualTo"] = 0] = "EqualTo";
+        Comparison[Comparison["GreaterThan"] = 1] = "GreaterThan";
+    })(Comparison = ts.Comparison || (ts.Comparison = {}));
+    /** Create a MapLike with good performance. */
+    function createDictionaryObject() {
+        var map = Object.create(/*prototype*/ null); // tslint:disable-line:no-null-keyword
+        // Using 'delete' on an object causes V8 to put the object in dictionary mode.
+        // This disables creation of hidden classes, which are expensive when an object is
+        // constantly changing shape.
+        map.__ = undefined;
+        delete map.__;
+        return map;
+    }
+    /** Create a new map. If a template object is provided, the map will copy entries from it. */
+    function createMap() {
+        return new ts.MapCtr();
+    }
+    ts.createMap = createMap;
+    function createMapFromEntries(entries) {
+        var map = createMap();
+        for (var _i = 0, entries_1 = entries; _i < entries_1.length; _i++) {
+            var _a = entries_1[_i], key = _a[0], value = _a[1];
+            map.set(key, value);
+        }
+        return map;
+    }
+    ts.createMapFromEntries = createMapFromEntries;
+    function createMapFromTemplate(template) {
+        var map = new ts.MapCtr();
+        // Copies keys/values from template. Note that for..in will not throw if
+        // template is undefined, and instead will just exit the loop.
+        for (var key in template) {
+            if (hasOwnProperty.call(template, key)) {
+                map.set(key, template[key]);
+            }
+        }
+        return map;
+    }
+    ts.createMapFromTemplate = createMapFromTemplate;
+    // Internet Explorer's Map doesn't support iteration, so don't use it.
+    // tslint:disable-next-line no-in-operator variable-name
+    ts.MapCtr = typeof Map !== "undefined" && "entries" in Map.prototype ? Map : shimMap();
+    // Keep the class inside a function so it doesn't get compiled if it's not used.
+    function shimMap() {
+        var MapIterator = /** @class */ (function () {
+            function MapIterator(data, selector) {
+                this.index = 0;
+                this.data = data;
+                this.selector = selector;
+                this.keys = Object.keys(data);
+            }
+            MapIterator.prototype.next = function () {
+                var index = this.index;
+                if (index < this.keys.length) {
+                    this.index++;
+                    return { value: this.selector(this.data, this.keys[index]), done: false };
+                }
+                return { value: undefined, done: true };
+            };
+            return MapIterator;
+        }());
+        return /** @class */ (function () {
+            function class_1() {
+                this.data = createDictionaryObject();
+                this.size = 0;
+            }
+            class_1.prototype.get = function (key) {
+                return this.data[key];
+            };
+            class_1.prototype.set = function (key, value) {
+                if (!this.has(key)) {
+                    this.size++;
+                }
+                this.data[key] = value;
+                return this;
+            };
+            class_1.prototype.has = function (key) {
+                // tslint:disable-next-line:no-in-operator
+                return key in this.data;
+            };
+            class_1.prototype.delete = function (key) {
+                if (this.has(key)) {
+                    this.size--;
+                    delete this.data[key];
+                    return true;
+                }
+                return false;
+            };
+            class_1.prototype.clear = function () {
+                this.data = createDictionaryObject();
+                this.size = 0;
+            };
+            class_1.prototype.keys = function () {
+                return new MapIterator(this.data, function (_data, key) { return key; });
+            };
+            class_1.prototype.values = function () {
+                return new MapIterator(this.data, function (data, key) { return data[key]; });
+            };
+            class_1.prototype.entries = function () {
+                return new MapIterator(this.data, function (data, key) { return [key, data[key]]; });
+            };
+            class_1.prototype.forEach = function (action) {
+                for (var key in this.data) {
+                    action(this.data[key], key);
+                }
+            };
+            return class_1;
+        }());
+    }
+    function length(array) {
+        return array ? array.length : 0;
+    }
+    ts.length = length;
+    /**
+     * Iterates through 'array' by index and performs the callback on each element of array until the callback
+     * returns a truthy value, then returns that value.
+     * If no such value is found, the callback is applied to each element of array and undefined is returned.
+     */
+    function forEach(array, callback) {
+        if (array) {
+            for (var i = 0; i < array.length; i++) {
+                var result = callback(array[i], i);
+                if (result) {
+                    return result;
+                }
+            }
+        }
+        return undefined;
+    }
+    ts.forEach = forEach;
+    /** Like `forEach`, but suitable for use with numbers and strings (which may be falsy). */
+    function firstDefined(array, callback) {
+        if (array === undefined) {
+            return undefined;
+        }
+        for (var i = 0; i < array.length; i++) {
+            var result = callback(array[i], i);
+            if (result !== undefined) {
+                return result;
+            }
+        }
+        return undefined;
+    }
+    ts.firstDefined = firstDefined;
+    function firstDefinedIterator(iter, callback) {
+        while (true) {
+            var _a = iter.next(), value = _a.value, done = _a.done;
+            if (done) {
+                return undefined;
+            }
+            var result = callback(value);
+            if (result !== undefined) {
+                return result;
+            }
+        }
+    }
+    ts.firstDefinedIterator = firstDefinedIterator;
+    function zipWith(arrayA, arrayB, callback) {
+        var result = [];
+        Debug.assertEqual(arrayA.length, arrayB.length);
+        for (var i = 0; i < arrayA.length; i++) {
+            result.push(callback(arrayA[i], arrayB[i], i));
+        }
+        return result;
+    }
+    ts.zipWith = zipWith;
+    function zipToIterator(arrayA, arrayB) {
+        Debug.assertEqual(arrayA.length, arrayB.length);
+        var i = 0;
+        return {
+            next: function () {
+                if (i === arrayA.length) {
+                    return { value: undefined, done: true };
+                }
+                i++;
+                return { value: [arrayA[i - 1], arrayB[i - 1]], done: false };
+            }
+        };
+    }
+    ts.zipToIterator = zipToIterator;
+    function zipToMap(keys, values) {
+        Debug.assert(keys.length === values.length);
+        var map = createMap();
+        for (var i = 0; i < keys.length; ++i) {
+            map.set(keys[i], values[i]);
+        }
+        return map;
+    }
+    ts.zipToMap = zipToMap;
+    /**
+     * Iterates through `array` by index and performs the callback on each element of array until the callback
+     * returns a falsey value, then returns false.
+     * If no such value is found, the callback is applied to each element of array and `true` is returned.
+     */
+    function every(array, callback) {
+        if (array) {
+            for (var i = 0; i < array.length; i++) {
+                if (!callback(array[i], i)) {
+                    return false;
+                }
+            }
+        }
+        return true;
+    }
+    ts.every = every;
+    function find(array, predicate) {
+        for (var i = 0; i < array.length; i++) {
+            var value = array[i];
+            if (predicate(value, i)) {
+                return value;
+            }
+        }
+        return undefined;
+    }
+    ts.find = find;
+    function findLast(array, predicate) {
+        for (var i = array.length - 1; i >= 0; i--) {
+            var value = array[i];
+            if (predicate(value, i)) {
+                return value;
+            }
+        }
+        return undefined;
+    }
+    ts.findLast = findLast;
+    /** Works like Array.prototype.findIndex, returning `-1` if no element satisfying the predicate is found. */
+    function findIndex(array, predicate, startIndex) {
+        for (var i = startIndex || 0; i < array.length; i++) {
+            if (predicate(array[i], i)) {
+                return i;
+            }
+        }
+        return -1;
+    }
+    ts.findIndex = findIndex;
+    function findLastIndex(array, predicate, startIndex) {
+        for (var i = startIndex === undefined ? array.length - 1 : startIndex; i >= 0; i--) {
+            if (predicate(array[i], i)) {
+                return i;
+            }
+        }
+        return -1;
+    }
+    ts.findLastIndex = findLastIndex;
+    /**
+     * Returns the first truthy result of `callback`, or else fails.
+     * This is like `forEach`, but never returns undefined.
+     */
+    function findMap(array, callback) {
+        for (var i = 0; i < array.length; i++) {
+            var result = callback(array[i], i);
+            if (result) {
+                return result;
+            }
+        }
+        return Debug.fail();
+    }
+    ts.findMap = findMap;
+    function contains(array, value, equalityComparer) {
+        if (equalityComparer === void 0) { equalityComparer = equateValues; }
+        if (array) {
+            for (var _i = 0, array_1 = array; _i < array_1.length; _i++) {
+                var v = array_1[_i];
+                if (equalityComparer(v, value)) {
+                    return true;
+                }
+            }
+        }
+        return false;
+    }
+    ts.contains = contains;
+    function arraysEqual(a, b, equalityComparer) {
+        if (equalityComparer === void 0) { equalityComparer = equateValues; }
+        return a.length === b.length && a.every(function (x, i) { return equalityComparer(x, b[i]); });
+    }
+    ts.arraysEqual = arraysEqual;
+    function indexOfAnyCharCode(text, charCodes, start) {
+        for (var i = start || 0; i < text.length; i++) {
+            if (contains(charCodes, text.charCodeAt(i))) {
+                return i;
+            }
+        }
+        return -1;
+    }
+    ts.indexOfAnyCharCode = indexOfAnyCharCode;
+    function countWhere(array, predicate) {
+        var count = 0;
+        if (array) {
+            for (var i = 0; i < array.length; i++) {
+                var v = array[i];
+                if (predicate(v, i)) {
+                    count++;
+                }
+            }
+        }
+        return count;
+    }
+    ts.countWhere = countWhere;
+    function filter(array, f) {
+        if (array) {
+            var len = array.length;
+            var i = 0;
+            while (i < len && f(array[i]))
+                i++;
+            if (i < len) {
+                var result = array.slice(0, i);
+                i++;
+                while (i < len) {
+                    var item = array[i];
+                    if (f(item)) {
+                        result.push(item);
+                    }
+                    i++;
+                }
+                return result;
+            }
+        }
+        return array;
+    }
+    ts.filter = filter;
+    function filterMutate(array, f) {
+        var outIndex = 0;
+        for (var i = 0; i < array.length; i++) {
+            if (f(array[i], i, array)) {
+                array[outIndex] = array[i];
+                outIndex++;
+            }
+        }
+        array.length = outIndex;
+    }
+    ts.filterMutate = filterMutate;
+    function clear(array) {
+        array.length = 0;
+    }
+    ts.clear = clear;
+    function map(array, f) {
+        var result;
+        if (array) {
+            result = [];
+            for (var i = 0; i < array.length; i++) {
+                result.push(f(array[i], i));
+            }
+        }
+        return result;
+    }
+    ts.map = map;
+    function mapIterator(iter, mapFn) {
+        return {
+            next: function () {
+                var iterRes = iter.next();
+                return iterRes.done ? iterRes : { value: mapFn(iterRes.value), done: false };
+            }
+        };
+    }
+    ts.mapIterator = mapIterator;
+    function sameMap(array, f) {
+        if (array) {
+            for (var i = 0; i < array.length; i++) {
+                var item = array[i];
+                var mapped = f(item, i);
+                if (item !== mapped) {
+                    var result = array.slice(0, i);
+                    result.push(mapped);
+                    for (i++; i < array.length; i++) {
+                        result.push(f(array[i], i));
+                    }
+                    return result;
+                }
+            }
+        }
+        return array;
+    }
+    ts.sameMap = sameMap;
+    function flatten(array) {
+        var result;
+        if (array) {
+            result = [];
+            for (var _i = 0, array_2 = array; _i < array_2.length; _i++) {
+                var v = array_2[_i];
+                if (v) {
+                    if (isArray(v)) {
+                        addRange(result, v);
+                    }
+                    else {
+                        result.push(v);
+                    }
+                }
+            }
+        }
+        return result;
+    }
+    ts.flatten = flatten;
+    function flatMap(array, mapfn) {
+        var result;
+        if (array) {
+            result = [];
+            for (var i = 0; i < array.length; i++) {
+                var v = mapfn(array[i], i);
+                if (v) {
+                    if (isArray(v)) {
+                        addRange(result, v);
+                    }
+                    else {
+                        result.push(v);
+                    }
+                }
+            }
+        }
+        return result;
+    }
+    ts.flatMap = flatMap;
+    function flatMapIterator(iter, mapfn) {
+        var first = iter.next();
+        if (first.done) {
+            return ts.emptyIterator;
+        }
+        var currentIter = getIterator(first.value);
+        return {
+            next: function () {
+                while (true) {
+                    var currentRes = currentIter.next();
+                    if (!currentRes.done) {
+                        return currentRes;
+                    }
+                    var iterRes = iter.next();
+                    if (iterRes.done) {
+                        return iterRes;
+                    }
+                    currentIter = getIterator(iterRes.value);
+                }
+            },
+        };
+        function getIterator(x) {
+            var res = mapfn(x);
+            return res === undefined ? ts.emptyIterator : isArray(res) ? arrayIterator(res) : res;
+        }
+    }
+    ts.flatMapIterator = flatMapIterator;
+    function sameFlatMap(array, mapfn) {
+        var result;
+        if (array) {
+            for (var i = 0; i < array.length; i++) {
+                var item = array[i];
+                var mapped = mapfn(item, i);
+                if (result || item !== mapped || isArray(mapped)) {
+                    if (!result) {
+                        result = array.slice(0, i);
+                    }
+                    if (isArray(mapped)) {
+                        addRange(result, mapped);
+                    }
+                    else {
+                        result.push(mapped);
+                    }
+                }
+            }
+        }
+        return result || array;
+    }
+    ts.sameFlatMap = sameFlatMap;
+    function mapAllOrFail(array, mapFn) {
+        var result = [];
+        for (var i = 0; i < array.length; i++) {
+            var mapped = mapFn(array[i], i);
+            if (mapped === undefined) {
+                return undefined;
+            }
+            result.push(mapped);
+        }
+        return result;
+    }
+    ts.mapAllOrFail = mapAllOrFail;
+    function mapDefined(array, mapFn) {
+        var result = [];
+        if (array) {
+            for (var i = 0; i < array.length; i++) {
+                var mapped = mapFn(array[i], i);
+                if (mapped !== undefined) {
+                    result.push(mapped);
+                }
+            }
+        }
+        return result;
+    }
+    ts.mapDefined = mapDefined;
+    function mapDefinedIterator(iter, mapFn) {
+        return {
+            next: function () {
+                while (true) {
+                    var res = iter.next();
+                    if (res.done) {
+                        return res;
+                    }
+                    var value = mapFn(res.value);
+                    if (value !== undefined) {
+                        return { value: value, done: false };
+                    }
+                }
+            }
+        };
+    }
+    ts.mapDefinedIterator = mapDefinedIterator;
+    ts.emptyIterator = { next: function () { return ({ value: undefined, done: true }); } };
+    function singleIterator(value) {
+        var done = false;
+        return {
+            next: function () {
+                var wasDone = done;
+                done = true;
+                return wasDone ? { value: undefined, done: true } : { value: value, done: false };
+            }
+        };
+    }
+    ts.singleIterator = singleIterator;
+    function spanMap(array, keyfn, mapfn) {
+        var result;
+        if (array) {
+            result = [];
+            var len = array.length;
+            var previousKey = void 0;
+            var key = void 0;
+            var start = 0;
+            var pos = 0;
+            while (start < len) {
+                while (pos < len) {
+                    var value = array[pos];
+                    key = keyfn(value, pos);
+                    if (pos === 0) {
+                        previousKey = key;
+                    }
+                    else if (key !== previousKey) {
+                        break;
+                    }
+                    pos++;
+                }
+                if (start < pos) {
+                    var v = mapfn(array.slice(start, pos), previousKey, start, pos);
+                    if (v) {
+                        result.push(v);
+                    }
+                    start = pos;
+                }
+                previousKey = key;
+                pos++;
+            }
+        }
+        return result;
+    }
+    ts.spanMap = spanMap;
+    function mapEntries(map, f) {
+        if (!map) {
+            return undefined;
+        }
+        var result = createMap();
+        map.forEach(function (value, key) {
+            var _a = f(key, value), newKey = _a[0], newValue = _a[1];
+            result.set(newKey, newValue);
+        });
+        return result;
+    }
+    ts.mapEntries = mapEntries;
+    function some(array, predicate) {
+        if (array) {
+            if (predicate) {
+                for (var _i = 0, array_3 = array; _i < array_3.length; _i++) {
+                    var v = array_3[_i];
+                    if (predicate(v)) {
+                        return true;
+                    }
+                }
+            }
+            else {
+                return array.length > 0;
+            }
+        }
+        return false;
+    }
+    ts.some = some;
+    /** Calls the callback with (start, afterEnd) index pairs for each range where 'pred' is true. */
+    function getRangesWhere(arr, pred, cb) {
+        var start;
+        for (var i = 0; i < arr.length; i++) {
+            if (pred(arr[i])) {
+                start = start === undefined ? i : start;
+            }
+            else {
+                if (start !== undefined) {
+                    cb(start, i);
+                    start = undefined;
+                }
+            }
+        }
+        if (start !== undefined)
+            cb(start, arr.length);
+    }
+    ts.getRangesWhere = getRangesWhere;
+    function concatenate(array1, array2) {
+        if (!some(array2))
+            return array1;
+        if (!some(array1))
+            return array2;
+        return array1.concat(array2);
+    }
+    ts.concatenate = concatenate;
+    function deduplicateRelational(array, equalityComparer, comparer) {
+        // Perform a stable sort of the array. This ensures the first entry in a list of
+        // duplicates remains the first entry in the result.
+        var indices = array.map(function (_, i) { return i; });
+        stableSortIndices(array, indices, comparer);
+        var last = array[indices[0]];
+        var deduplicated = [indices[0]];
+        for (var i = 1; i < indices.length; i++) {
+            var index = indices[i];
+            var item = array[index];
+            if (!equalityComparer(last, item)) {
+                deduplicated.push(index);
+                last = item;
+            }
+        }
+        // restore original order
+        deduplicated.sort();
+        return deduplicated.map(function (i) { return array[i]; });
+    }
+    function deduplicateEquality(array, equalityComparer) {
+        var result = [];
+        for (var _i = 0, array_4 = array; _i < array_4.length; _i++) {
+            var item = array_4[_i];
+            pushIfUnique(result, item, equalityComparer);
+        }
+        return result;
+    }
+    function deduplicate(array, equalityComparer, comparer) {
+        return !array ? undefined :
+            array.length === 0 ? [] :
+                array.length === 1 ? array.slice() :
+                    comparer ? deduplicateRelational(array, equalityComparer, comparer) :
+                        deduplicateEquality(array, equalityComparer);
+    }
+    ts.deduplicate = deduplicate;
+    function deduplicateSorted(array, comparer) {
+        if (!array)
+            return undefined;
+        if (array.length === 0)
+            return [];
+        var last = array[0];
+        var deduplicated = [last];
+        for (var i = 1; i < array.length; i++) {
+            var next = array[i];
+            switch (comparer(next, last)) {
+                // equality comparison
+                case true:
+                // relational comparison
+                case 0 /* EqualTo */:
+                    continue;
+                case -1 /* LessThan */:
+                    // If `array` is sorted, `next` should **never** be less than `last`.
+                    return Debug.fail("Array is unsorted.");
+            }
+            deduplicated.push(last = next);
+        }
+        return deduplicated;
+    }
+    function insertSorted(array, insert, compare) {
+        if (array.length === 0) {
+            array.push(insert);
+            return;
+        }
+        var insertIndex = binarySearch(array, insert, identity, compare);
+        if (insertIndex < 0) {
+            array.splice(~insertIndex, 0, insert);
+        }
+    }
+    ts.insertSorted = insertSorted;
+    function sortAndDeduplicate(array, comparer, equalityComparer) {
+        return deduplicateSorted(sort(array, comparer), equalityComparer || comparer);
+    }
+    ts.sortAndDeduplicate = sortAndDeduplicate;
+    function arrayIsEqualTo(array1, array2, equalityComparer) {
+        if (equalityComparer === void 0) { equalityComparer = equateValues; }
+        if (!array1 || !array2) {
+            return array1 === array2;
+        }
+        if (array1.length !== array2.length) {
+            return false;
+        }
+        for (var i = 0; i < array1.length; i++) {
+            if (!equalityComparer(array1[i], array2[i])) {
+                return false;
+            }
+        }
+        return true;
+    }
+    ts.arrayIsEqualTo = arrayIsEqualTo;
+    function compact(array) {
+        var result;
+        if (array) {
+            for (var i = 0; i < array.length; i++) {
+                var v = array[i];
+                if (result || !v) {
+                    if (!result) {
+                        result = array.slice(0, i);
+                    }
+                    if (v) {
+                        result.push(v);
+                    }
+                }
+            }
+        }
+        return result || array;
+    }
+    ts.compact = compact;
+    /**
+     * Gets the relative complement of `arrayA` with respect to `arrayB`, returning the elements that
+     * are not present in `arrayA` but are present in `arrayB`. Assumes both arrays are sorted
+     * based on the provided comparer.
+     */
+    function relativeComplement(arrayA, arrayB, comparer) {
+        if (!arrayB || !arrayA || arrayB.length === 0 || arrayA.length === 0)
+            return arrayB;
+        var result = [];
+        loopB: for (var offsetA = 0, offsetB = 0; offsetB < arrayB.length; offsetB++) {
+            if (offsetB > 0) {
+                // Ensure `arrayB` is properly sorted.
+                Debug.assertGreaterThanOrEqual(comparer(arrayB[offsetB], arrayB[offsetB - 1]), 0 /* EqualTo */);
+            }
+            loopA: for (var startA = offsetA; offsetA < arrayA.length; offsetA++) {
+                if (offsetA > startA) {
+                    // Ensure `arrayA` is properly sorted. We only need to perform this check if
+                    // `offsetA` has changed since we entered the loop.
+                    Debug.assertGreaterThanOrEqual(comparer(arrayA[offsetA], arrayA[offsetA - 1]), 0 /* EqualTo */);
+                }
+                switch (comparer(arrayB[offsetB], arrayA[offsetA])) {
+                    case -1 /* LessThan */:
+                        // If B is less than A, B does not exist in arrayA. Add B to the result and
+                        // move to the next element in arrayB without changing the current position
+                        // in arrayA.
+                        result.push(arrayB[offsetB]);
+                        continue loopB;
+                    case 0 /* EqualTo */:
+                        // If B is equal to A, B exists in arrayA. Move to the next element in
+                        // arrayB without adding B to the result or changing the current position
+                        // in arrayA.
+                        continue loopB;
+                    case 1 /* GreaterThan */:
+                        // If B is greater than A, we need to keep looking for B in arrayA. Move to
+                        // the next element in arrayA and recheck.
+                        continue loopA;
+                }
+            }
+        }
+        return result;
+    }
+    ts.relativeComplement = relativeComplement;
+    function sum(array, prop) {
+        var result = 0;
+        for (var _i = 0, array_5 = array; _i < array_5.length; _i++) {
+            var v = array_5[_i];
+            result += v[prop];
+        }
+        return result;
+    }
+    ts.sum = sum;
+    function append(to, value) {
+        if (value === undefined)
+            return to;
+        if (to === undefined)
+            return [value];
+        to.push(value);
+        return to;
+    }
+    ts.append = append;
+    /**
+     * Gets the actual offset into an array for a relative offset. Negative offsets indicate a
+     * position offset from the end of the array.
+     */
+    function toOffset(array, offset) {
+        return offset < 0 ? array.length + offset : offset;
+    }
+    function addRange(to, from, start, end) {
+        if (from === undefined || from.length === 0)
+            return to;
+        if (to === undefined)
+            return from.slice(start, end);
+        start = start === undefined ? 0 : toOffset(from, start);
+        end = end === undefined ? from.length : toOffset(from, end);
+        for (var i = start; i < end && i < from.length; i++) {
+            if (from[i] !== undefined) {
+                to.push(from[i]);
+            }
+        }
+        return to;
+    }
+    ts.addRange = addRange;
+    /**
+     * @return Whether the value was added.
+     */
+    function pushIfUnique(array, toAdd, equalityComparer) {
+        if (contains(array, toAdd, equalityComparer)) {
+            return false;
+        }
+        else {
+            array.push(toAdd);
+            return true;
+        }
+    }
+    ts.pushIfUnique = pushIfUnique;
+    /**
+     * Unlike `pushIfUnique`, this can take `undefined` as an input, and returns a new array.
+     */
+    function appendIfUnique(array, toAdd, equalityComparer) {
+        if (array) {
+            pushIfUnique(array, toAdd, equalityComparer);
+            return array;
+        }
+        else {
+            return [toAdd];
+        }
+    }
+    ts.appendIfUnique = appendIfUnique;
+    function stableSortIndices(array, indices, comparer) {
+        // sort indices by value then position
+        indices.sort(function (x, y) { return comparer(array[x], array[y]) || compareValues(x, y); });
+    }
+    /**
+     * Returns a new sorted array.
+     */
+    function sort(array, comparer) {
+        return array.slice().sort(comparer);
+    }
+    ts.sort = sort;
+    function best(iter, isBetter) {
+        var x = iter.next();
+        if (x.done) {
+            return undefined;
+        }
+        var best = x.value;
+        while (true) {
+            var _a = iter.next(), value = _a.value, done = _a.done;
+            if (done) {
+                return best;
+            }
+            if (isBetter(value, best)) {
+                best = value;
+            }
+        }
+    }
+    ts.best = best;
+    function arrayIterator(array) {
+        var i = 0;
+        return { next: function () {
+                if (i === array.length) {
+                    return { value: undefined, done: true };
+                }
+                else {
+                    i++;
+                    return { value: array[i - 1], done: false };
+                }
+            } };
+    }
+    ts.arrayIterator = arrayIterator;
+    /**
+     * Stable sort of an array. Elements equal to each other maintain their relative position in the array.
+     */
+    function stableSort(array, comparer) {
+        var indices = array.map(function (_, i) { return i; });
+        stableSortIndices(array, indices, comparer);
+        return indices.map(function (i) { return array[i]; });
+    }
+    ts.stableSort = stableSort;
+    function rangeEquals(array1, array2, pos, end) {
+        while (pos < end) {
+            if (array1[pos] !== array2[pos]) {
+                return false;
+            }
+            pos++;
+        }
+        return true;
+    }
+    ts.rangeEquals = rangeEquals;
+    /**
+     * Returns the element at a specific offset in an array if non-empty, `undefined` otherwise.
+     * A negative offset indicates the element should be retrieved from the end of the array.
+     */
+    function elementAt(array, offset) {
+        if (array) {
+            offset = toOffset(array, offset);
+            if (offset < array.length) {
+                return array[offset];
+            }
+        }
+        return undefined;
+    }
+    ts.elementAt = elementAt;
+    /**
+     * Returns the first element of an array if non-empty, `undefined` otherwise.
+     */
+    function firstOrUndefined(array) {
+        return array.length === 0 ? undefined : array[0];
+    }
+    ts.firstOrUndefined = firstOrUndefined;
+    function first(array) {
+        Debug.assert(array.length !== 0);
+        return array[0];
+    }
+    ts.first = first;
+    /**
+     * Returns the last element of an array if non-empty, `undefined` otherwise.
+     */
+    function lastOrUndefined(array) {
+        return array.length === 0 ? undefined : array[array.length - 1];
+    }
+    ts.lastOrUndefined = lastOrUndefined;
+    function last(array) {
+        Debug.assert(array.length !== 0);
+        return array[array.length - 1];
+    }
+    ts.last = last;
+    /**
+     * Returns the only element of an array if it contains only one element, `undefined` otherwise.
+     */
+    function singleOrUndefined(array) {
+        return array && array.length === 1
+            ? array[0]
+            : undefined;
+    }
+    ts.singleOrUndefined = singleOrUndefined;
+    function singleOrMany(array) {
+        return array && array.length === 1
+            ? array[0]
+            : array;
+    }
+    ts.singleOrMany = singleOrMany;
+    function replaceElement(array, index, value) {
+        var result = array.slice(0);
+        result[index] = value;
+        return result;
+    }
+    ts.replaceElement = replaceElement;
+    /**
+     * Performs a binary search, finding the index at which `value` occurs in `array`.
+     * If no such index is found, returns the 2's-complement of first index at which
+     * `array[index]` exceeds `value`.
+     * @param array A sorted array whose first element must be no larger than number
+     * @param value The value to be searched for in the array.
+     * @param keySelector A callback used to select the search key from `value` and each element of
+     * `array`.
+     * @param keyComparer A callback used to compare two keys in a sorted array.
+     * @param offset An offset into `array` at which to start the search.
+     */
+    function binarySearch(array, value, keySelector, keyComparer, offset) {
+        if (!array || array.length === 0) {
+            return -1;
+        }
+        var low = offset || 0;
+        var high = array.length - 1;
+        var key = keySelector(value);
+        while (low <= high) {
+            var middle = low + ((high - low) >> 1);
+            var midKey = keySelector(array[middle]);
+            switch (keyComparer(midKey, key)) {
+                case -1 /* LessThan */:
+                    low = middle + 1;
+                    break;
+                case 0 /* EqualTo */:
+                    return middle;
+                case 1 /* GreaterThan */:
+                    high = middle - 1;
+                    break;
+            }
+        }
+        return ~low;
+    }
+    ts.binarySearch = binarySearch;
+    function reduceLeft(array, f, initial, start, count) {
+        if (array && array.length > 0) {
+            var size = array.length;
+            if (size > 0) {
+                var pos = start === undefined || start < 0 ? 0 : start;
+                var end = count === undefined || pos + count > size - 1 ? size - 1 : pos + count;
+                var result = void 0;
+                if (arguments.length <= 2) {
+                    result = array[pos];
+                    pos++;
+                }
+                else {
+                    result = initial;
+                }
+                while (pos <= end) {
+                    result = f(result, array[pos], pos);
+                    pos++;
+                }
+                return result;
+            }
+        }
+        return initial;
+    }
+    ts.reduceLeft = reduceLeft;
+    var hasOwnProperty = Object.prototype.hasOwnProperty;
+    /**
+     * Indicates whether a map-like contains an own property with the specified key.
+     *
+     * @param map A map-like.
+     * @param key A property key.
+     */
+    function hasProperty(map, key) {
+        return hasOwnProperty.call(map, key);
+    }
+    ts.hasProperty = hasProperty;
+    /**
+     * Gets the value of an owned property in a map-like.
+     *
+     * @param map A map-like.
+     * @param key A property key.
+     */
+    function getProperty(map, key) {
+        return hasOwnProperty.call(map, key) ? map[key] : undefined;
+    }
+    ts.getProperty = getProperty;
+    /**
+     * Gets the owned, enumerable property keys of a map-like.
+     */
+    function getOwnKeys(map) {
+        var keys = [];
+        for (var key in map) {
+            if (hasOwnProperty.call(map, key)) {
+                keys.push(key);
+            }
+        }
+        return keys;
+    }
+    ts.getOwnKeys = getOwnKeys;
+    function getOwnValues(sparseArray) {
+        var values = [];
+        for (var key in sparseArray) {
+            if (hasOwnProperty.call(sparseArray, key)) {
+                values.push(sparseArray[key]);
+            }
+        }
+        return values;
+    }
+    ts.getOwnValues = getOwnValues;
+    function arrayFrom(iterator, map) {
+        var _a;
+        var result = [];
+        for (var _b = iterator.next(), value = _b.value, done = _b.done; !done; _a = iterator.next(), value = _a.value, done = _a.done, _a) {
+            result.push(map ? map(value) : value);
+        }
+        return result;
+    }
+    ts.arrayFrom = arrayFrom;
+    function assign(t) {
+        var args = [];
+        for (var _i = 1; _i < arguments.length; _i++) {
+            args[_i - 1] = arguments[_i];
+        }
+        for (var _a = 0, args_1 = args; _a < args_1.length; _a++) {
+            var arg = args_1[_a];
+            for (var p in arg) {
+                if (hasProperty(arg, p)) {
+                    t[p] = arg[p]; // TODO: GH#23368
+                }
+            }
+        }
+        return t;
+    }
+    ts.assign = assign;
+    /**
+     * Performs a shallow equality comparison of the contents of two map-likes.
+     *
+     * @param left A map-like whose properties should be compared.
+     * @param right A map-like whose properties should be compared.
+     */
+    function equalOwnProperties(left, right, equalityComparer) {
+        if (equalityComparer === void 0) { equalityComparer = equateValues; }
+        if (left === right)
+            return true;
+        if (!left || !right)
+            return false;
+        for (var key in left) {
+            if (hasOwnProperty.call(left, key)) {
+                if (!hasOwnProperty.call(right, key) === undefined)
+                    return false;
+                if (!equalityComparer(left[key], right[key]))
+                    return false;
+            }
+        }
+        for (var key in right) {
+            if (hasOwnProperty.call(right, key)) {
+                if (!hasOwnProperty.call(left, key))
+                    return false;
+            }
+        }
+        return true;
+    }
+    ts.equalOwnProperties = equalOwnProperties;
+    function arrayToMap(array, makeKey, makeValue) {
+        if (makeValue === void 0) { makeValue = identity; }
+        var result = createMap();
+        for (var _i = 0, array_6 = array; _i < array_6.length; _i++) {
+            var value = array_6[_i];
+            var key = makeKey(value);
+            if (key !== undefined)
+                result.set(key, makeValue(value));
+        }
+        return result;
+    }
+    ts.arrayToMap = arrayToMap;
+    function arrayToNumericMap(array, makeKey, makeValue) {
+        if (makeValue === void 0) { makeValue = identity; }
+        var result = [];
+        for (var _i = 0, array_7 = array; _i < array_7.length; _i++) {
+            var value = array_7[_i];
+            result[makeKey(value)] = makeValue(value);
+        }
+        return result;
+    }
+    ts.arrayToNumericMap = arrayToNumericMap;
+    function arrayToMultiMap(values, makeKey, makeValue) {
+        if (makeValue === void 0) { makeValue = identity; }
+        var result = createMultiMap();
+        for (var _i = 0, values_1 = values; _i < values_1.length; _i++) {
+            var value = values_1[_i];
+            result.add(makeKey(value), makeValue(value));
+        }
+        return result;
+    }
+    ts.arrayToMultiMap = arrayToMultiMap;
+    function group(values, getGroupId) {
+        return arrayFrom(arrayToMultiMap(values, getGroupId).values());
+    }
+    ts.group = group;
+    function clone(object) {
+        var result = {};
+        for (var id in object) {
+            if (hasOwnProperty.call(object, id)) {
+                result[id] = object[id];
+            }
+        }
+        return result;
+    }
+    ts.clone = clone;
+    function extend(first, second) {
+        var result = {};
+        for (var id in second) {
+            if (hasOwnProperty.call(second, id)) {
+                result[id] = second[id];
+            }
+        }
+        for (var id in first) {
+            if (hasOwnProperty.call(first, id)) {
+                result[id] = first[id];
+            }
+        }
+        return result;
+    }
+    ts.extend = extend;
+    function createMultiMap() {
+        var map = createMap();
+        map.add = multiMapAdd;
+        map.remove = multiMapRemove;
+        return map;
+    }
+    ts.createMultiMap = createMultiMap;
+    function multiMapAdd(key, value) {
+        var values = this.get(key);
+        if (values) {
+            values.push(value);
+        }
+        else {
+            this.set(key, values = [value]);
+        }
+        return values;
+    }
+    function multiMapRemove(key, value) {
+        var values = this.get(key);
+        if (values) {
+            unorderedRemoveItem(values, value);
+            if (!values.length) {
+                this.delete(key);
+            }
+        }
+    }
+    /**
+     * Tests whether a value is an array.
+     */
+    function isArray(value) {
+        return Array.isArray ? Array.isArray(value) : value instanceof Array;
+    }
+    ts.isArray = isArray;
+    function toArray(value) {
+        return isArray(value) ? value : [value];
+    }
+    ts.toArray = toArray;
+    /**
+     * Tests whether a value is string
+     */
+    function isString(text) {
+        return typeof text === "string";
+    }
+    ts.isString = isString;
+    function tryCast(value, test) {
+        return value !== undefined && test(value) ? value : undefined;
+    }
+    ts.tryCast = tryCast;
+    function cast(value, test) {
+        if (value !== undefined && test(value))
+            return value;
+        return Debug.fail("Invalid cast. The supplied value " + value + " did not pass the test '" + Debug.getFunctionName(test) + "'.");
+    }
+    ts.cast = cast;
+    /** Does nothing. */
+    function noop(_) { } // tslint:disable-line no-empty
+    ts.noop = noop;
+    /** Do nothing and return false */
+    function returnFalse() { return false; }
+    ts.returnFalse = returnFalse;
+    /** Do nothing and return true */
+    function returnTrue() { return true; }
+    ts.returnTrue = returnTrue;
+    /** Returns its argument. */
+    function identity(x) { return x; }
+    ts.identity = identity;
+    /** Returns lower case string */
+    function toLowerCase(x) { return x.toLowerCase(); }
+    ts.toLowerCase = toLowerCase;
+    /** Throws an error because a function is not implemented. */
+    function notImplemented() {
+        throw new Error("Not implemented");
+    }
+    ts.notImplemented = notImplemented;
+    function memoize(callback) {
+        var value;
+        return function () {
+            if (callback) {
+                value = callback();
+                callback = undefined;
+            }
+            return value;
+        };
+    }
+    ts.memoize = memoize;
+    function chain(a, b, c, d, e) {
+        if (e) {
+            var args_2 = [];
+            for (var i = 0; i < arguments.length; i++) {
+                args_2[i] = arguments[i];
+            }
+            return function (t) { return compose.apply(void 0, map(args_2, function (f) { return f(t); })); };
+        }
+        else if (d) {
+            return function (t) { return compose(a(t), b(t), c(t), d(t)); };
+        }
+        else if (c) {
+            return function (t) { return compose(a(t), b(t), c(t)); };
+        }
+        else if (b) {
+            return function (t) { return compose(a(t), b(t)); };
+        }
+        else if (a) {
+            return function (t) { return compose(a(t)); };
+        }
+        else {
+            return function (_) { return function (u) { return u; }; };
+        }
+    }
+    ts.chain = chain;
+    function compose(a, b, c, d, e) {
+        if (e) {
+            var args_3 = [];
+            for (var i = 0; i < arguments.length; i++) {
+                args_3[i] = arguments[i];
+            }
+            return function (t) { return reduceLeft(args_3, function (u, f) { return f(u); }, t); };
+        }
+        else if (d) {
+            return function (t) { return d(c(b(a(t)))); };
+        }
+        else if (c) {
+            return function (t) { return c(b(a(t))); };
+        }
+        else if (b) {
+            return function (t) { return b(a(t)); };
+        }
+        else if (a) {
+            return function (t) { return a(t); };
+        }
+        else {
+            return function (t) { return t; };
+        }
+    }
+    ts.compose = compose;
+    var AssertionLevel;
+    (function (AssertionLevel) {
+        AssertionLevel[AssertionLevel["None"] = 0] = "None";
+        AssertionLevel[AssertionLevel["Normal"] = 1] = "Normal";
+        AssertionLevel[AssertionLevel["Aggressive"] = 2] = "Aggressive";
+        AssertionLevel[AssertionLevel["VeryAggressive"] = 3] = "VeryAggressive";
+    })(AssertionLevel = ts.AssertionLevel || (ts.AssertionLevel = {}));
+    var Debug;
+    (function (Debug) {
+        Debug.currentAssertionLevel = 0 /* None */;
+        Debug.isDebugging = false;
+        function shouldAssert(level) {
+            return Debug.currentAssertionLevel >= level;
+        }
+        Debug.shouldAssert = shouldAssert;
+        function assert(expression, message, verboseDebugInfo, stackCrawlMark) {
+            if (!expression) {
+                if (verboseDebugInfo) {
+                    message += "\r\nVerbose Debug Information: " + (typeof verboseDebugInfo === "string" ? verboseDebugInfo : verboseDebugInfo());
+                }
+                fail(message ? "False expression: " + message : "False expression.", stackCrawlMark || assert);
+            }
+        }
+        Debug.assert = assert;
+        function assertEqual(a, b, msg, msg2) {
+            if (a !== b) {
+                var message = msg ? msg2 ? msg + " " + msg2 : msg : "";
+                fail("Expected " + a + " === " + b + ". " + message);
+            }
+        }
+        Debug.assertEqual = assertEqual;
+        function assertLessThan(a, b, msg) {
+            if (a >= b) {
+                fail("Expected " + a + " < " + b + ". " + (msg || ""));
+            }
+        }
+        Debug.assertLessThan = assertLessThan;
+        function assertLessThanOrEqual(a, b) {
+            if (a > b) {
+                fail("Expected " + a + " <= " + b);
+            }
+        }
+        Debug.assertLessThanOrEqual = assertLessThanOrEqual;
+        function assertGreaterThanOrEqual(a, b) {
+            if (a < b) {
+                fail("Expected " + a + " >= " + b);
+            }
+        }
+        Debug.assertGreaterThanOrEqual = assertGreaterThanOrEqual;
+        function fail(message, stackCrawlMark) {
+            debugger;
+            var e = new Error(message ? "Debug Failure. " + message : "Debug Failure.");
+            if (Error.captureStackTrace) {
+                Error.captureStackTrace(e, stackCrawlMark || fail);
+            }
+            throw e;
+        }
+        Debug.fail = fail;
+        function assertDefined(value, message) {
+            if (value === undefined || value === null)
+                return fail(message);
+            return value;
+        }
+        Debug.assertDefined = assertDefined;
+        function assertEachDefined(value, message) {
+            for (var _i = 0, value_1 = value; _i < value_1.length; _i++) {
+                var v = value_1[_i];
+                assertDefined(v, message);
+            }
+            return value;
+        }
+        Debug.assertEachDefined = assertEachDefined;
+        function assertNever(member, message, stackCrawlMark) {
+            return fail(message || "Illegal value: " + member, stackCrawlMark || assertNever);
+        }
+        Debug.assertNever = assertNever;
+        function getFunctionName(func) {
+            if (typeof func !== "function") {
+                return "";
+            }
+            else if (func.hasOwnProperty("name")) {
+                return func.name;
+            }
+            else {
+                var text = Function.prototype.toString.call(func);
+                var match = /^function\s+([\w\$]+)\s*\(/.exec(text);
+                return match ? match[1] : "";
+            }
+        }
+        Debug.getFunctionName = getFunctionName;
+    })(Debug = ts.Debug || (ts.Debug = {}));
+    function equateValues(a, b) {
+        return a === b;
+    }
+    ts.equateValues = equateValues;
+    /**
+     * Compare the equality of two strings using a case-sensitive ordinal comparison.
+     *
+     * Case-sensitive comparisons compare both strings one code-point at a time using the integer
+     * value of each code-point after applying `toUpperCase` to each string. We always map both
+     * strings to their upper-case form as some unicode characters do not properly round-trip to
+     * lowercase (such as `ẞ` (German sharp capital s)).
+     */
+    function equateStringsCaseInsensitive(a, b) {
+        return a === b
+            || a !== undefined
+                && b !== undefined
+                && a.toUpperCase() === b.toUpperCase();
+    }
+    ts.equateStringsCaseInsensitive = equateStringsCaseInsensitive;
+    /**
+     * Compare the equality of two strings using a case-sensitive ordinal comparison.
+     *
+     * Case-sensitive comparisons compare both strings one code-point at a time using the
+     * integer value of each code-point.
+     */
+    function equateStringsCaseSensitive(a, b) {
+        return equateValues(a, b);
+    }
+    ts.equateStringsCaseSensitive = equateStringsCaseSensitive;
+    function compareComparableValues(a, b) {
+        return a === b ? 0 /* EqualTo */ :
+            a === undefined ? -1 /* LessThan */ :
+                b === undefined ? 1 /* GreaterThan */ :
+                    a < b ? -1 /* LessThan */ :
+                        1 /* GreaterThan */;
+    }
+    /**
+     * Compare two numeric values for their order relative to each other.
+     * To compare strings, use any of the `compareStrings` functions.
+     */
+    function compareValues(a, b) {
+        return compareComparableValues(a, b);
+    }
+    ts.compareValues = compareValues;
+    function min(a, b, compare) {
+        return compare(a, b) === -1 /* LessThan */ ? a : b;
+    }
+    ts.min = min;
+    /**
+     * Compare two strings using a case-insensitive ordinal comparison.
+     *
+     * Ordinal comparisons are based on the difference between the unicode code points of both
+     * strings. Characters with multiple unicode representations are considered unequal. Ordinal
+     * comparisons provide predictable ordering, but place "a" after "B".
+     *
+     * Case-insensitive comparisons compare both strings one code-point at a time using the integer
+     * value of each code-point after applying `toUpperCase` to each string. We always map both
+     * strings to their upper-case form as some unicode characters do not properly round-trip to
+     * lowercase (such as `ẞ` (German sharp capital s)).
+     */
+    function compareStringsCaseInsensitive(a, b) {
+        if (a === b)
+            return 0 /* EqualTo */;
+        if (a === undefined)
+            return -1 /* LessThan */;
+        if (b === undefined)
+            return 1 /* GreaterThan */;
+        a = a.toUpperCase();
+        b = b.toUpperCase();
+        return a < b ? -1 /* LessThan */ : a > b ? 1 /* GreaterThan */ : 0 /* EqualTo */;
+    }
+    ts.compareStringsCaseInsensitive = compareStringsCaseInsensitive;
+    /**
+     * Compare two strings using a case-sensitive ordinal comparison.
+     *
+     * Ordinal comparisons are based on the difference between the unicode code points of both
+     * strings. Characters with multiple unicode representations are considered unequal. Ordinal
+     * comparisons provide predictable ordering, but place "a" after "B".
+     *
+     * Case-sensitive comparisons compare both strings one code-point at a time using the integer
+     * value of each code-point.
+     */
+    function compareStringsCaseSensitive(a, b) {
+        return compareComparableValues(a, b);
+    }
+    ts.compareStringsCaseSensitive = compareStringsCaseSensitive;
+    function getStringComparer(ignoreCase) {
+        return ignoreCase ? compareStringsCaseInsensitive : compareStringsCaseSensitive;
+    }
+    ts.getStringComparer = getStringComparer;
+    /**
+     * Creates a string comparer for use with string collation in the UI.
+     */
+    var createUIStringComparer = (function () {
+        var defaultComparer;
+        var enUSComparer;
+        var stringComparerFactory = getStringComparerFactory();
+        return createStringComparer;
+        function compareWithCallback(a, b, comparer) {
+            if (a === b)
+                return 0 /* EqualTo */;
+            if (a === undefined)
+                return -1 /* LessThan */;
+            if (b === undefined)
+                return 1 /* GreaterThan */;
+            var value = comparer(a, b);
+            return value < 0 ? -1 /* LessThan */ : value > 0 ? 1 /* GreaterThan */ : 0 /* EqualTo */;
+        }
+        function createIntlCollatorStringComparer(locale) {
+            // Intl.Collator.prototype.compare is bound to the collator. See NOTE in
+            // http://www.ecma-international.org/ecma-402/2.0/#sec-Intl.Collator.prototype.compare
+            var comparer = new Intl.Collator(locale, { usage: "sort", sensitivity: "variant" }).compare;
+            return function (a, b) { return compareWithCallback(a, b, comparer); };
+        }
+        function createLocaleCompareStringComparer(locale) {
+            // if the locale is not the default locale (`undefined`), use the fallback comparer.
+            if (locale !== undefined)
+                return createFallbackStringComparer();
+            return function (a, b) { return compareWithCallback(a, b, compareStrings); };
+            function compareStrings(a, b) {
+                return a.localeCompare(b);
+            }
+        }
+        function createFallbackStringComparer() {
+            // An ordinal comparison puts "A" after "b", but for the UI we want "A" before "b".
+            // We first sort case insensitively.  So "Aaa" will come before "baa".
+            // Then we sort case sensitively, so "aaa" will come before "Aaa".
+            //
+            // For case insensitive comparisons we always map both strings to their
+            // upper-case form as some unicode characters do not properly round-trip to
+            // lowercase (such as `ẞ` (German sharp capital s)).
+            return function (a, b) { return compareWithCallback(a, b, compareDictionaryOrder); };
+            function compareDictionaryOrder(a, b) {
+                return compareStrings(a.toUpperCase(), b.toUpperCase()) || compareStrings(a, b);
+            }
+            function compareStrings(a, b) {
+                return a < b ? -1 /* LessThan */ : a > b ? 1 /* GreaterThan */ : 0 /* EqualTo */;
+            }
+        }
+        function getStringComparerFactory() {
+            // If the host supports Intl, we use it for comparisons using the default locale.
+            if (typeof Intl === "object" && typeof Intl.Collator === "function") {
+                return createIntlCollatorStringComparer;
+            }
+            // If the host does not support Intl, we fall back to localeCompare.
+            // localeCompare in Node v0.10 is just an ordinal comparison, so don't use it.
+            if (typeof String.prototype.localeCompare === "function" &&
+                typeof String.prototype.toLocaleUpperCase === "function" &&
+                "a".localeCompare("B") < 0) {
+                return createLocaleCompareStringComparer;
+            }
+            // Otherwise, fall back to ordinal comparison:
+            return createFallbackStringComparer;
+        }
+        function createStringComparer(locale) {
+            // Hold onto common string comparers. This avoids constantly reallocating comparers during
+            // tests.
+            if (locale === undefined) {
+                return defaultComparer || (defaultComparer = stringComparerFactory(locale));
+            }
+            else if (locale === "en-US") {
+                return enUSComparer || (enUSComparer = stringComparerFactory(locale));
+            }
+            else {
+                return stringComparerFactory(locale);
+            }
+        }
+    })();
+    var uiComparerCaseSensitive;
+    var uiLocale;
+    function getUILocale() {
+        return uiLocale;
+    }
+    ts.getUILocale = getUILocale;
+    function setUILocale(value) {
+        if (uiLocale !== value) {
+            uiLocale = value;
+            uiComparerCaseSensitive = undefined;
+        }
+    }
+    ts.setUILocale = setUILocale;
+    /**
+     * Compare two strings in a using the case-sensitive sort behavior of the UI locale.
+     *
+     * Ordering is not predictable between different host locales, but is best for displaying
+     * ordered data for UI presentation. Characters with multiple unicode representations may
+     * be considered equal.
+     *
+     * Case-sensitive comparisons compare strings that differ in base characters, or
+     * accents/diacritic marks, or case as unequal.
+     */
+    function compareStringsCaseSensitiveUI(a, b) {
+        var comparer = uiComparerCaseSensitive || (uiComparerCaseSensitive = createUIStringComparer(uiLocale));
+        return comparer(a, b);
+    }
+    ts.compareStringsCaseSensitiveUI = compareStringsCaseSensitiveUI;
+    function compareProperties(a, b, key, comparer) {
+        return a === b ? 0 /* EqualTo */ :
+            a === undefined ? -1 /* LessThan */ :
+                b === undefined ? 1 /* GreaterThan */ :
+                    comparer(a[key], b[key]);
+    }
+    ts.compareProperties = compareProperties;
+    /** True is greater than false. */
+    function compareBooleans(a, b) {
+        return compareValues(a ? 1 : 0, b ? 1 : 0);
+    }
+    ts.compareBooleans = compareBooleans;
+    /**
+     * Given a name and a list of names that are *not* equal to the name, return a spelling suggestion if there is one that is close enough.
+     * Names less than length 3 only check for case-insensitive equality, not Levenshtein distance.
+     *
+     * If there is a candidate that's the same except for case, return that.
+     * If there is a candidate that's within one edit of the name, return that.
+     * Otherwise, return the candidate with the smallest Levenshtein distance,
+     *    except for candidates:
+     *      * With no name
+     *      * Whose length differs from the target name by more than 0.34 of the length of the name.
+     *      * Whose levenshtein distance is more than 0.4 of the length of the name
+     *        (0.4 allows 1 substitution/transposition for every 5 characters,
+     *         and 1 insertion/deletion at 3 characters)
+     */
+    function getSpellingSuggestion(name, candidates, getName) {
+        var maximumLengthDifference = Math.min(2, Math.floor(name.length * 0.34));
+        var bestDistance = Math.floor(name.length * 0.4) + 1; // If the best result isn't better than this, don't bother.
+        var bestCandidate;
+        var justCheckExactMatches = false;
+        var nameLowerCase = name.toLowerCase();
+        for (var _i = 0, candidates_1 = candidates; _i < candidates_1.length; _i++) {
+            var candidate = candidates_1[_i];
+            var candidateName = getName(candidate);
+            if (candidateName !== undefined && Math.abs(candidateName.length - nameLowerCase.length) <= maximumLengthDifference) {
+                var candidateNameLowerCase = candidateName.toLowerCase();
+                if (candidateNameLowerCase === nameLowerCase) {
+                    return candidate;
+                }
+                if (justCheckExactMatches) {
+                    continue;
+                }
+                if (candidateName.length < 3) {
+                    // Don't bother, user would have noticed a 2-character name having an extra character
+                    continue;
+                }
+                // Only care about a result better than the best so far.
+                var distance = levenshteinWithMax(nameLowerCase, candidateNameLowerCase, bestDistance - 1);
+                if (distance === undefined) {
+                    continue;
+                }
+                if (distance < 3) {
+                    justCheckExactMatches = true;
+                    bestCandidate = candidate;
+                }
+                else {
+                    Debug.assert(distance < bestDistance); // Else `levenshteinWithMax` should return undefined
+                    bestDistance = distance;
+                    bestCandidate = candidate;
+                }
+            }
+        }
+        return bestCandidate;
+    }
+    ts.getSpellingSuggestion = getSpellingSuggestion;
+    function levenshteinWithMax(s1, s2, max) {
+        var previous = new Array(s2.length + 1);
+        var current = new Array(s2.length + 1);
+        /** Represents any value > max. We don't care about the particular value. */
+        var big = max + 1;
+        for (var i = 0; i <= s2.length; i++) {
+            previous[i] = i;
+        }
+        for (var i = 1; i <= s1.length; i++) {
+            var c1 = s1.charCodeAt(i - 1);
+            var minJ = i > max ? i - max : 1;
+            var maxJ = s2.length > max + i ? max + i : s2.length;
+            current[0] = i;
+            /** Smallest value of the matrix in the ith column. */
+            var colMin = i;
+            for (var j = 1; j < minJ; j++) {
+                current[j] = big;
+            }
+            for (var j = minJ; j <= maxJ; j++) {
+                var dist = c1 === s2.charCodeAt(j - 1)
+                    ? previous[j - 1]
+                    : Math.min(/*delete*/ previous[j] + 1, /*insert*/ current[j - 1] + 1, /*substitute*/ previous[j - 1] + 2);
+                current[j] = dist;
+                colMin = Math.min(colMin, dist);
+            }
+            for (var j = maxJ + 1; j <= s2.length; j++) {
+                current[j] = big;
+            }
+            if (colMin > max) {
+                // Give up -- everything in this column is > max and it can't get better in future columns.
+                return undefined;
+            }
+            var temp = previous;
+            previous = current;
+            current = temp;
+        }
+        var res = previous[s2.length];
+        return res > max ? undefined : res;
+    }
+    function endsWith(str, suffix) {
+        var expectedPos = str.length - suffix.length;
+        return expectedPos >= 0 && str.indexOf(suffix, expectedPos) === expectedPos;
+    }
+    ts.endsWith = endsWith;
+    function removeSuffix(str, suffix) {
+        return endsWith(str, suffix) ? str.slice(0, str.length - suffix.length) : str;
+    }
+    ts.removeSuffix = removeSuffix;
+    function tryRemoveSuffix(str, suffix) {
+        return endsWith(str, suffix) ? str.slice(0, str.length - suffix.length) : undefined;
+    }
+    ts.tryRemoveSuffix = tryRemoveSuffix;
+    function stringContains(str, substring) {
+        return str.indexOf(substring) !== -1;
+    }
+    ts.stringContains = stringContains;
+    function fileExtensionIs(path, extension) {
+        return path.length > extension.length && endsWith(path, extension);
+    }
+    ts.fileExtensionIs = fileExtensionIs;
+    function fileExtensionIsOneOf(path, extensions) {
+        for (var _i = 0, extensions_1 = extensions; _i < extensions_1.length; _i++) {
+            var extension = extensions_1[_i];
+            if (fileExtensionIs(path, extension)) {
+                return true;
+            }
+        }
+        return false;
+    }
+    ts.fileExtensionIsOneOf = fileExtensionIsOneOf;
+    /**
+     * Takes a string like "jquery-min.4.2.3" and returns "jquery"
+     */
+    function removeMinAndVersionNumbers(fileName) {
+        // Match a "." or "-" followed by a version number or 'min' at the end of the name
+        var trailingMinOrVersion = /[.-]((min)|(\d+(\.\d+)*))$/;
+        // The "min" or version may both be present, in either order, so try applying the above twice.
+        return fileName.replace(trailingMinOrVersion, "").replace(trailingMinOrVersion, "");
+    }
+    ts.removeMinAndVersionNumbers = removeMinAndVersionNumbers;
+    /** Remove an item from an array, moving everything to its right one space left. */
+    function orderedRemoveItem(array, item) {
+        for (var i = 0; i < array.length; i++) {
+            if (array[i] === item) {
+                orderedRemoveItemAt(array, i);
+                return true;
+            }
+        }
+        return false;
+    }
+    ts.orderedRemoveItem = orderedRemoveItem;
+    /** Remove an item by index from an array, moving everything to its right one space left. */
+    function orderedRemoveItemAt(array, index) {
+        // This seems to be faster than either `array.splice(i, 1)` or `array.copyWithin(i, i+ 1)`.
+        for (var i = index; i < array.length - 1; i++) {
+            array[i] = array[i + 1];
+        }
+        array.pop();
+    }
+    ts.orderedRemoveItemAt = orderedRemoveItemAt;
+    function unorderedRemoveItemAt(array, index) {
+        // Fill in the "hole" left at `index`.
+        array[index] = array[array.length - 1];
+        array.pop();
+    }
+    ts.unorderedRemoveItemAt = unorderedRemoveItemAt;
+    /** Remove the *first* occurrence of `item` from the array. */
+    function unorderedRemoveItem(array, item) {
+        return unorderedRemoveFirstItemWhere(array, function (element) { return element === item; });
+    }
+    ts.unorderedRemoveItem = unorderedRemoveItem;
+    /** Remove the *first* element satisfying `predicate`. */
+    function unorderedRemoveFirstItemWhere(array, predicate) {
+        for (var i = 0; i < array.length; i++) {
+            if (predicate(array[i])) {
+                unorderedRemoveItemAt(array, i);
+                return true;
+            }
+        }
+        return false;
+    }
+    function createGetCanonicalFileName(useCaseSensitiveFileNames) {
+        return useCaseSensitiveFileNames ? identity : toLowerCase;
+    }
+    ts.createGetCanonicalFileName = createGetCanonicalFileName;
+    function patternText(_a) {
+        var prefix = _a.prefix, suffix = _a.suffix;
+        return prefix + "*" + suffix;
+    }
+    ts.patternText = patternText;
+    /**
+     * Given that candidate matches pattern, returns the text matching the '*'.
+     * E.g.: matchedText(tryParsePattern("foo*baz"), "foobarbaz") === "bar"
+     */
+    function matchedText(pattern, candidate) {
+        Debug.assert(isPatternMatch(pattern, candidate));
+        return candidate.substring(pattern.prefix.length, candidate.length - pattern.suffix.length);
+    }
+    ts.matchedText = matchedText;
+    /** Return the object corresponding to the best pattern to match `candidate`. */
+    function findBestPatternMatch(values, getPattern, candidate) {
+        var matchedValue;
+        // use length of prefix as betterness criteria
+        var longestMatchPrefixLength = -1;
+        for (var _i = 0, values_2 = values; _i < values_2.length; _i++) {
+            var v = values_2[_i];
+            var pattern = getPattern(v);
+            if (isPatternMatch(pattern, candidate) && pattern.prefix.length > longestMatchPrefixLength) {
+                longestMatchPrefixLength = pattern.prefix.length;
+                matchedValue = v;
+            }
+        }
+        return matchedValue;
+    }
+    ts.findBestPatternMatch = findBestPatternMatch;
+    function startsWith(str, prefix) {
+        return str.lastIndexOf(prefix, 0) === 0;
+    }
+    ts.startsWith = startsWith;
+    function removePrefix(str, prefix) {
+        return startsWith(str, prefix) ? str.substr(prefix.length) : str;
+    }
+    ts.removePrefix = removePrefix;
+    function tryRemovePrefix(str, prefix) {
+        return startsWith(str, prefix) ? str.substring(prefix.length) : undefined;
+    }
+    ts.tryRemovePrefix = tryRemovePrefix;
+    function isPatternMatch(_a, candidate) {
+        var prefix = _a.prefix, suffix = _a.suffix;
+        return candidate.length >= prefix.length + suffix.length &&
+            startsWith(candidate, prefix) &&
+            endsWith(candidate, suffix);
+    }
+    function and(f, g) {
+        return function (arg) { return f(arg) && g(arg); };
+    }
+    ts.and = and;
+    function or(f, g) {
+        return function (arg) { return f(arg) || g(arg); };
+    }
+    ts.or = or;
+    function assertTypeIsNever(_) { } // tslint:disable-line no-empty
+    ts.assertTypeIsNever = assertTypeIsNever;
+    function singleElementArray(t) {
+        return t === undefined ? undefined : [t];
+    }
+    ts.singleElementArray = singleElementArray;
+    function enumerateInsertsAndDeletes(newItems, oldItems, comparer, inserted, deleted, unchanged) {
+        unchanged = unchanged || noop;
+        var newIndex = 0;
+        var oldIndex = 0;
+        var newLen = newItems.length;
+        var oldLen = oldItems.length;
+        while (newIndex < newLen && oldIndex < oldLen) {
+            var newItem = newItems[newIndex];
+            var oldItem = oldItems[oldIndex];
+            var compareResult = comparer(newItem, oldItem);
+            if (compareResult === -1 /* LessThan */) {
+                inserted(newItem);
+                newIndex++;
+            }
+            else if (compareResult === 1 /* GreaterThan */) {
+                deleted(oldItem);
+                oldIndex++;
+            }
+            else {
+                unchanged(oldItem, newItem);
+                newIndex++;
+                oldIndex++;
+            }
+        }
+        while (newIndex < newLen) {
+            inserted(newItems[newIndex++]);
+        }
+        while (oldIndex < oldLen) {
+            deleted(oldItems[oldIndex++]);
+        }
+    }
+    ts.enumerateInsertsAndDeletes = enumerateInsertsAndDeletes;
+})(ts || (ts = {}));
+//# sourceMappingURL=core.js.map
 "use strict";
 var __assign = (this && this.__assign) || Object.assign || function(t) {
     for (var s, i = 1, n = arguments.length; i < n; i++) {
@@ -22,29 +1994,8 @@ var __assign = (this && this.__assign) || Object.assign || function(t) {
     }
     return t;
 };
-var __makeTemplateObject = (this && this.__makeTemplateObject) || function (cooked, raw) {
-    if (Object.defineProperty) { Object.defineProperty(cooked, "raw", { value: raw }); } else { cooked.raw = raw; }
-    return cooked;
-};
-var __extends = (this && this.__extends) || (function () {
-    var extendStatics = Object.setPrototypeOf ||
-        ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
-        function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
-    return function (d, b) {
-        extendStatics(d, b);
-        function __() { this.constructor = d; }
-        d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
-    };
-})();
 var ts;
 (function (ts) {
-    /* @internal */
-    var Comparison;
-    (function (Comparison) {
-        Comparison[Comparison["LessThan"] = -1] = "LessThan";
-        Comparison[Comparison["EqualTo"] = 0] = "EqualTo";
-        Comparison[Comparison["GreaterThan"] = 1] = "GreaterThan";
-    })(Comparison = ts.Comparison || (ts.Comparison = {}));
     // token > SyntaxKind.Identifier => token is a keyword
     // Also, If you add a new SyntaxKind be sure to keep the `Markers` section at the bottom in sync
     var SyntaxKind;
@@ -1517,6 +3468,7 @@ var ts;
         "reference": {
             args: [
                 { name: "types", optional: true, captureSpan: true },
+                { name: "lib", optional: true, captureSpan: true },
                 { name: "path", optional: true, captureSpan: true },
                 { name: "no-default-lib", optional: true }
             ],
@@ -1542,3216 +3494,6 @@ var ts;
         },
     });
 })(ts || (ts = {}));
-/*@internal*/
-var ts;
-(function (ts) {
-    /** Gets a timestamp with (at least) ms resolution */
-    ts.timestamp = typeof performance !== "undefined" && performance.now ? function () { return performance.now(); } : Date.now ? Date.now : function () { return +(new Date()); };
-})(ts || (ts = {}));
-/*@internal*/
-/** Performance measurements for the compiler. */
-(function (ts) {
-    var performance;
-    (function (performance) {
-        // NOTE: cannot use ts.noop as core.ts loads after this
-        var profilerEvent = typeof onProfilerEvent === "function" && onProfilerEvent.profiler === true ? onProfilerEvent : function () { };
-        var enabled = false;
-        var profilerStart = 0;
-        var counts;
-        var marks;
-        var measures;
-        /**
-         * Marks a performance event.
-         *
-         * @param markName The name of the mark.
-         */
-        function mark(markName) {
-            if (enabled) {
-                marks.set(markName, ts.timestamp());
-                counts.set(markName, (counts.get(markName) || 0) + 1);
-                profilerEvent(markName);
-            }
-        }
-        performance.mark = mark;
-        /**
-         * Adds a performance measurement with the specified name.
-         *
-         * @param measureName The name of the performance measurement.
-         * @param startMarkName The name of the starting mark. If not supplied, the point at which the
-         *      profiler was enabled is used.
-         * @param endMarkName The name of the ending mark. If not supplied, the current timestamp is
-         *      used.
-         */
-        function measure(measureName, startMarkName, endMarkName) {
-            if (enabled) {
-                var end = endMarkName && marks.get(endMarkName) || ts.timestamp();
-                var start = startMarkName && marks.get(startMarkName) || profilerStart;
-                measures.set(measureName, (measures.get(measureName) || 0) + (end - start));
-            }
-        }
-        performance.measure = measure;
-        /**
-         * Gets the number of times a marker was encountered.
-         *
-         * @param markName The name of the mark.
-         */
-        function getCount(markName) {
-            return counts && counts.get(markName) || 0;
-        }
-        performance.getCount = getCount;
-        /**
-         * Gets the total duration of all measurements with the supplied name.
-         *
-         * @param measureName The name of the measure whose durations should be accumulated.
-         */
-        function getDuration(measureName) {
-            return measures && measures.get(measureName) || 0;
-        }
-        performance.getDuration = getDuration;
-        /**
-         * Iterate over each measure, performing some action
-         *
-         * @param cb The action to perform for each measure
-         */
-        function forEachMeasure(cb) {
-            measures.forEach(function (measure, key) {
-                cb(key, measure);
-            });
-        }
-        performance.forEachMeasure = forEachMeasure;
-        /** Enables (and resets) performance measurements for the compiler. */
-        function enable() {
-            counts = ts.createMap();
-            marks = ts.createMap();
-            measures = ts.createMap();
-            enabled = true;
-            profilerStart = ts.timestamp();
-        }
-        performance.enable = enable;
-        /** Disables performance measurements for the compiler. */
-        function disable() {
-            enabled = false;
-        }
-        performance.disable = disable;
-    })(performance = ts.performance || (ts.performance = {}));
-})(ts || (ts = {}));
-var ts;
-(function (ts) {
-    // WARNING: The script `configureNightly.ts` uses a regexp to parse out these values.
-    // If changing the text in this section, be sure to test `configureNightly` too.
-    ts.versionMajorMinor = "3.0";
-    /** The version of the TypeScript compiler release */
-    ts.version = ts.versionMajorMinor + ".0-dev";
-})(ts || (ts = {}));
-(function (ts) {
-    function isExternalModuleNameRelative(moduleName) {
-        // TypeScript 1.0 spec (April 2014): 11.2.1
-        // An external module name is "relative" if the first term is "." or "..".
-        // Update: We also consider a path like `C:\foo.ts` "relative" because we do not search for it in `node_modules` or treat it as an ambient module.
-        return ts.pathIsRelative(moduleName) || ts.isRootedDiskPath(moduleName);
-    }
-    ts.isExternalModuleNameRelative = isExternalModuleNameRelative;
-    function sortAndDeduplicateDiagnostics(diagnostics) {
-        return ts.sortAndDeduplicate(diagnostics, ts.compareDiagnostics);
-    }
-    ts.sortAndDeduplicateDiagnostics = sortAndDeduplicateDiagnostics;
-})(ts || (ts = {}));
-/* @internal */
-(function (ts) {
-    ts.emptyArray = [];
-    function closeFileWatcher(watcher) {
-        watcher.close();
-    }
-    ts.closeFileWatcher = closeFileWatcher;
-    /** Create a MapLike with good performance. */
-    function createDictionaryObject() {
-        var map = Object.create(/*prototype*/ null); // tslint:disable-line:no-null-keyword
-        // Using 'delete' on an object causes V8 to put the object in dictionary mode.
-        // This disables creation of hidden classes, which are expensive when an object is
-        // constantly changing shape.
-        map.__ = undefined;
-        delete map.__;
-        return map;
-    }
-    /** Create a new map. If a template object is provided, the map will copy entries from it. */
-    function createMap() {
-        return new MapCtr();
-    }
-    ts.createMap = createMap;
-    /** Create a new escaped identifier map. */
-    function createUnderscoreEscapedMap() {
-        return new MapCtr();
-    }
-    ts.createUnderscoreEscapedMap = createUnderscoreEscapedMap;
-    function createSymbolTable(symbols) {
-        var result = createMap();
-        if (symbols) {
-            for (var _i = 0, symbols_1 = symbols; _i < symbols_1.length; _i++) {
-                var symbol = symbols_1[_i];
-                result.set(symbol.escapedName, symbol);
-            }
-        }
-        return result;
-    }
-    ts.createSymbolTable = createSymbolTable;
-    function createMapFromTemplate(template) {
-        var map = new MapCtr();
-        // Copies keys/values from template. Note that for..in will not throw if
-        // template is undefined, and instead will just exit the loop.
-        for (var key in template) {
-            if (hasOwnProperty.call(template, key)) {
-                map.set(key, template[key]);
-            }
-        }
-        return map;
-    }
-    ts.createMapFromTemplate = createMapFromTemplate;
-    // Internet Explorer's Map doesn't support iteration, so don't use it.
-    // tslint:disable-next-line no-in-operator variable-name
-    var MapCtr = typeof Map !== "undefined" && "entries" in Map.prototype ? Map : shimMap();
-    // Keep the class inside a function so it doesn't get compiled if it's not used.
-    function shimMap() {
-        var MapIterator = /** @class */ (function () {
-            function MapIterator(data, selector) {
-                this.index = 0;
-                this.data = data;
-                this.selector = selector;
-                this.keys = Object.keys(data);
-            }
-            MapIterator.prototype.next = function () {
-                var index = this.index;
-                if (index < this.keys.length) {
-                    this.index++;
-                    return { value: this.selector(this.data, this.keys[index]), done: false };
-                }
-                return { value: undefined, done: true };
-            };
-            return MapIterator;
-        }());
-        return /** @class */ (function () {
-            function class_1() {
-                this.data = createDictionaryObject();
-                this.size = 0;
-            }
-            class_1.prototype.get = function (key) {
-                return this.data[key];
-            };
-            class_1.prototype.set = function (key, value) {
-                if (!this.has(key)) {
-                    this.size++;
-                }
-                this.data[key] = value;
-                return this;
-            };
-            class_1.prototype.has = function (key) {
-                // tslint:disable-next-line:no-in-operator
-                return key in this.data;
-            };
-            class_1.prototype.delete = function (key) {
-                if (this.has(key)) {
-                    this.size--;
-                    delete this.data[key];
-                    return true;
-                }
-                return false;
-            };
-            class_1.prototype.clear = function () {
-                this.data = createDictionaryObject();
-                this.size = 0;
-            };
-            class_1.prototype.keys = function () {
-                return new MapIterator(this.data, function (_data, key) { return key; });
-            };
-            class_1.prototype.values = function () {
-                return new MapIterator(this.data, function (data, key) { return data[key]; });
-            };
-            class_1.prototype.entries = function () {
-                return new MapIterator(this.data, function (data, key) { return [key, data[key]]; });
-            };
-            class_1.prototype.forEach = function (action) {
-                for (var key in this.data) {
-                    action(this.data[key], key);
-                }
-            };
-            return class_1;
-        }());
-    }
-    function toPath(fileName, basePath, getCanonicalFileName) {
-        var nonCanonicalizedPath = isRootedDiskPath(fileName)
-            ? normalizePath(fileName)
-            : getNormalizedAbsolutePath(fileName, basePath);
-        return getCanonicalFileName(nonCanonicalizedPath);
-    }
-    ts.toPath = toPath;
-    function length(array) {
-        return array ? array.length : 0;
-    }
-    ts.length = length;
-    function hasEntries(map) {
-        return !!map && !!map.size;
-    }
-    ts.hasEntries = hasEntries;
-    /**
-     * Iterates through 'array' by index and performs the callback on each element of array until the callback
-     * returns a truthy value, then returns that value.
-     * If no such value is found, the callback is applied to each element of array and undefined is returned.
-     */
-    function forEach(array, callback) {
-        if (array) {
-            for (var i = 0; i < array.length; i++) {
-                var result = callback(array[i], i);
-                if (result) {
-                    return result;
-                }
-            }
-        }
-        return undefined;
-    }
-    ts.forEach = forEach;
-    /** Like `forEach`, but suitable for use with numbers and strings (which may be falsy). */
-    function firstDefined(array, callback) {
-        if (array === undefined) {
-            return undefined;
-        }
-        for (var i = 0; i < array.length; i++) {
-            var result = callback(array[i], i);
-            if (result !== undefined) {
-                return result;
-            }
-        }
-        return undefined;
-    }
-    ts.firstDefined = firstDefined;
-    function firstDefinedIterator(iter, callback) {
-        while (true) {
-            var _a = iter.next(), value = _a.value, done = _a.done;
-            if (done) {
-                return undefined;
-            }
-            var result = callback(value);
-            if (result !== undefined) {
-                return result;
-            }
-        }
-    }
-    ts.firstDefinedIterator = firstDefinedIterator;
-    function findAncestor(node, callback) {
-        while (node) {
-            var result = callback(node);
-            if (result === "quit") {
-                return undefined;
-            }
-            else if (result) {
-                return node;
-            }
-            node = node.parent;
-        }
-        return undefined;
-    }
-    ts.findAncestor = findAncestor;
-    function zipWith(arrayA, arrayB, callback) {
-        var result = [];
-        Debug.assertEqual(arrayA.length, arrayB.length);
-        for (var i = 0; i < arrayA.length; i++) {
-            result.push(callback(arrayA[i], arrayB[i], i));
-        }
-        return result;
-    }
-    ts.zipWith = zipWith;
-    function zipToIterator(arrayA, arrayB) {
-        Debug.assertEqual(arrayA.length, arrayB.length);
-        var i = 0;
-        return {
-            next: function () {
-                if (i === arrayA.length) {
-                    return { value: undefined, done: true };
-                }
-                i++;
-                return { value: [arrayA[i - 1], arrayB[i - 1]], done: false };
-            }
-        };
-    }
-    ts.zipToIterator = zipToIterator;
-    function zipToMap(keys, values) {
-        Debug.assert(keys.length === values.length);
-        var map = createMap();
-        for (var i = 0; i < keys.length; ++i) {
-            map.set(keys[i], values[i]);
-        }
-        return map;
-    }
-    ts.zipToMap = zipToMap;
-    /**
-     * Iterates through `array` by index and performs the callback on each element of array until the callback
-     * returns a falsey value, then returns false.
-     * If no such value is found, the callback is applied to each element of array and `true` is returned.
-     */
-    function every(array, callback) {
-        if (array) {
-            for (var i = 0; i < array.length; i++) {
-                if (!callback(array[i], i)) {
-                    return false;
-                }
-            }
-        }
-        return true;
-    }
-    ts.every = every;
-    function find(array, predicate) {
-        for (var i = 0; i < array.length; i++) {
-            var value = array[i];
-            if (predicate(value, i)) {
-                return value;
-            }
-        }
-        return undefined;
-    }
-    ts.find = find;
-    function findLast(array, predicate) {
-        for (var i = array.length - 1; i >= 0; i--) {
-            var value = array[i];
-            if (predicate(value, i)) {
-                return value;
-            }
-        }
-        return undefined;
-    }
-    ts.findLast = findLast;
-    /** Works like Array.prototype.findIndex, returning `-1` if no element satisfying the predicate is found. */
-    function findIndex(array, predicate, startIndex) {
-        for (var i = startIndex || 0; i < array.length; i++) {
-            if (predicate(array[i], i)) {
-                return i;
-            }
-        }
-        return -1;
-    }
-    ts.findIndex = findIndex;
-    function findLastIndex(array, predicate, startIndex) {
-        for (var i = startIndex === undefined ? array.length - 1 : startIndex; i >= 0; i--) {
-            if (predicate(array[i], i)) {
-                return i;
-            }
-        }
-        return -1;
-    }
-    ts.findLastIndex = findLastIndex;
-    /**
-     * Returns the first truthy result of `callback`, or else fails.
-     * This is like `forEach`, but never returns undefined.
-     */
-    function findMap(array, callback) {
-        for (var i = 0; i < array.length; i++) {
-            var result = callback(array[i], i);
-            if (result) {
-                return result;
-            }
-        }
-        return Debug.fail();
-    }
-    ts.findMap = findMap;
-    function contains(array, value, equalityComparer) {
-        if (equalityComparer === void 0) { equalityComparer = equateValues; }
-        if (array) {
-            for (var _i = 0, array_1 = array; _i < array_1.length; _i++) {
-                var v = array_1[_i];
-                if (equalityComparer(v, value)) {
-                    return true;
-                }
-            }
-        }
-        return false;
-    }
-    ts.contains = contains;
-    function arraysEqual(a, b, equalityComparer) {
-        if (equalityComparer === void 0) { equalityComparer = equateValues; }
-        return a.length === b.length && a.every(function (x, i) { return equalityComparer(x, b[i]); });
-    }
-    ts.arraysEqual = arraysEqual;
-    function indexOfAnyCharCode(text, charCodes, start) {
-        for (var i = start || 0; i < text.length; i++) {
-            if (contains(charCodes, text.charCodeAt(i))) {
-                return i;
-            }
-        }
-        return -1;
-    }
-    ts.indexOfAnyCharCode = indexOfAnyCharCode;
-    function countWhere(array, predicate) {
-        var count = 0;
-        if (array) {
-            for (var i = 0; i < array.length; i++) {
-                var v = array[i];
-                if (predicate(v, i)) {
-                    count++;
-                }
-            }
-        }
-        return count;
-    }
-    ts.countWhere = countWhere;
-    function filter(array, f) {
-        if (array) {
-            var len = array.length;
-            var i = 0;
-            while (i < len && f(array[i]))
-                i++;
-            if (i < len) {
-                var result = array.slice(0, i);
-                i++;
-                while (i < len) {
-                    var item = array[i];
-                    if (f(item)) {
-                        result.push(item);
-                    }
-                    i++;
-                }
-                return result;
-            }
-        }
-        return array;
-    }
-    ts.filter = filter;
-    function filterMutate(array, f) {
-        var outIndex = 0;
-        for (var i = 0; i < array.length; i++) {
-            if (f(array[i], i, array)) {
-                array[outIndex] = array[i];
-                outIndex++;
-            }
-        }
-        array.length = outIndex;
-    }
-    ts.filterMutate = filterMutate;
-    function clear(array) {
-        array.length = 0;
-    }
-    ts.clear = clear;
-    function map(array, f) {
-        var result;
-        if (array) {
-            result = [];
-            for (var i = 0; i < array.length; i++) {
-                result.push(f(array[i], i));
-            }
-        }
-        return result;
-    }
-    ts.map = map;
-    function mapIterator(iter, mapFn) {
-        return {
-            next: function () {
-                var iterRes = iter.next();
-                return iterRes.done ? iterRes : { value: mapFn(iterRes.value), done: false };
-            }
-        };
-    }
-    ts.mapIterator = mapIterator;
-    function sameMap(array, f) {
-        if (array) {
-            for (var i = 0; i < array.length; i++) {
-                var item = array[i];
-                var mapped = f(item, i);
-                if (item !== mapped) {
-                    var result = array.slice(0, i);
-                    result.push(mapped);
-                    for (i++; i < array.length; i++) {
-                        result.push(f(array[i], i));
-                    }
-                    return result;
-                }
-            }
-        }
-        return array;
-    }
-    ts.sameMap = sameMap;
-    function flatten(array) {
-        var result;
-        if (array) {
-            result = [];
-            for (var _i = 0, array_2 = array; _i < array_2.length; _i++) {
-                var v = array_2[_i];
-                if (v) {
-                    if (isArray(v)) {
-                        addRange(result, v);
-                    }
-                    else {
-                        result.push(v);
-                    }
-                }
-            }
-        }
-        return result;
-    }
-    ts.flatten = flatten;
-    function flatMap(array, mapfn) {
-        var result;
-        if (array) {
-            result = [];
-            for (var i = 0; i < array.length; i++) {
-                var v = mapfn(array[i], i);
-                if (v) {
-                    if (isArray(v)) {
-                        addRange(result, v);
-                    }
-                    else {
-                        result.push(v);
-                    }
-                }
-            }
-        }
-        return result;
-    }
-    ts.flatMap = flatMap;
-    function flatMapIterator(iter, mapfn) {
-        var first = iter.next();
-        if (first.done) {
-            return ts.emptyIterator;
-        }
-        var currentIter = getIterator(first.value);
-        return {
-            next: function () {
-                while (true) {
-                    var currentRes = currentIter.next();
-                    if (!currentRes.done) {
-                        return currentRes;
-                    }
-                    var iterRes = iter.next();
-                    if (iterRes.done) {
-                        return iterRes;
-                    }
-                    currentIter = getIterator(iterRes.value);
-                }
-            },
-        };
-        function getIterator(x) {
-            var res = mapfn(x);
-            return res === undefined ? ts.emptyIterator : isArray(res) ? arrayIterator(res) : res;
-        }
-    }
-    ts.flatMapIterator = flatMapIterator;
-    function sameFlatMap(array, mapfn) {
-        var result;
-        if (array) {
-            for (var i = 0; i < array.length; i++) {
-                var item = array[i];
-                var mapped = mapfn(item, i);
-                if (result || item !== mapped || isArray(mapped)) {
-                    if (!result) {
-                        result = array.slice(0, i);
-                    }
-                    if (isArray(mapped)) {
-                        addRange(result, mapped);
-                    }
-                    else {
-                        result.push(mapped);
-                    }
-                }
-            }
-        }
-        return result || array;
-    }
-    ts.sameFlatMap = sameFlatMap;
-    function mapAllOrFail(array, mapFn) {
-        var result = [];
-        for (var i = 0; i < array.length; i++) {
-            var mapped = mapFn(array[i], i);
-            if (mapped === undefined) {
-                return undefined;
-            }
-            result.push(mapped);
-        }
-        return result;
-    }
-    ts.mapAllOrFail = mapAllOrFail;
-    function mapDefined(array, mapFn) {
-        var result = [];
-        if (array) {
-            for (var i = 0; i < array.length; i++) {
-                var mapped = mapFn(array[i], i);
-                if (mapped !== undefined) {
-                    result.push(mapped);
-                }
-            }
-        }
-        return result;
-    }
-    ts.mapDefined = mapDefined;
-    function mapDefinedIterator(iter, mapFn) {
-        return {
-            next: function () {
-                while (true) {
-                    var res = iter.next();
-                    if (res.done) {
-                        return res;
-                    }
-                    var value = mapFn(res.value);
-                    if (value !== undefined) {
-                        return { value: value, done: false };
-                    }
-                }
-            }
-        };
-    }
-    ts.mapDefinedIterator = mapDefinedIterator;
-    ts.emptyIterator = { next: function () { return ({ value: undefined, done: true }); } };
-    function singleIterator(value) {
-        var done = false;
-        return {
-            next: function () {
-                var wasDone = done;
-                done = true;
-                return wasDone ? { value: undefined, done: true } : { value: value, done: false };
-            }
-        };
-    }
-    ts.singleIterator = singleIterator;
-    function spanMap(array, keyfn, mapfn) {
-        var result;
-        if (array) {
-            result = [];
-            var len = array.length;
-            var previousKey = void 0;
-            var key = void 0;
-            var start = 0;
-            var pos = 0;
-            while (start < len) {
-                while (pos < len) {
-                    var value = array[pos];
-                    key = keyfn(value, pos);
-                    if (pos === 0) {
-                        previousKey = key;
-                    }
-                    else if (key !== previousKey) {
-                        break;
-                    }
-                    pos++;
-                }
-                if (start < pos) {
-                    var v = mapfn(array.slice(start, pos), previousKey, start, pos);
-                    if (v) {
-                        result.push(v);
-                    }
-                    start = pos;
-                }
-                previousKey = key;
-                pos++;
-            }
-        }
-        return result;
-    }
-    ts.spanMap = spanMap;
-    function mapEntries(map, f) {
-        if (!map) {
-            return undefined;
-        }
-        var result = createMap();
-        map.forEach(function (value, key) {
-            var _a = f(key, value), newKey = _a[0], newValue = _a[1];
-            result.set(newKey, newValue);
-        });
-        return result;
-    }
-    ts.mapEntries = mapEntries;
-    function some(array, predicate) {
-        if (array) {
-            if (predicate) {
-                for (var _i = 0, array_3 = array; _i < array_3.length; _i++) {
-                    var v = array_3[_i];
-                    if (predicate(v)) {
-                        return true;
-                    }
-                }
-            }
-            else {
-                return array.length > 0;
-            }
-        }
-        return false;
-    }
-    ts.some = some;
-    /** Calls the callback with (start, afterEnd) index pairs for each range where 'pred' is true. */
-    function getRangesWhere(arr, pred, cb) {
-        var start;
-        for (var i = 0; i < arr.length; i++) {
-            if (pred(arr[i])) {
-                start = start === undefined ? i : start;
-            }
-            else {
-                if (start !== undefined) {
-                    cb(start, i);
-                    start = undefined;
-                }
-            }
-        }
-        if (start !== undefined)
-            cb(start, arr.length);
-    }
-    ts.getRangesWhere = getRangesWhere;
-    function concatenate(array1, array2) {
-        if (!some(array2))
-            return array1;
-        if (!some(array1))
-            return array2;
-        return array1.concat(array2);
-    }
-    ts.concatenate = concatenate;
-    function deduplicateRelational(array, equalityComparer, comparer) {
-        // Perform a stable sort of the array. This ensures the first entry in a list of
-        // duplicates remains the first entry in the result.
-        var indices = array.map(function (_, i) { return i; });
-        stableSortIndices(array, indices, comparer);
-        var last = array[indices[0]];
-        var deduplicated = [indices[0]];
-        for (var i = 1; i < indices.length; i++) {
-            var index = indices[i];
-            var item = array[index];
-            if (!equalityComparer(last, item)) {
-                deduplicated.push(index);
-                last = item;
-            }
-        }
-        // restore original order
-        deduplicated.sort();
-        return deduplicated.map(function (i) { return array[i]; });
-    }
-    function deduplicateEquality(array, equalityComparer) {
-        var result = [];
-        for (var _i = 0, array_4 = array; _i < array_4.length; _i++) {
-            var item = array_4[_i];
-            pushIfUnique(result, item, equalityComparer);
-        }
-        return result;
-    }
-    function deduplicate(array, equalityComparer, comparer) {
-        return !array ? undefined :
-            array.length === 0 ? [] :
-                array.length === 1 ? array.slice() :
-                    comparer ? deduplicateRelational(array, equalityComparer, comparer) :
-                        deduplicateEquality(array, equalityComparer);
-    }
-    ts.deduplicate = deduplicate;
-    function deduplicateSorted(array, comparer) {
-        if (!array)
-            return undefined;
-        if (array.length === 0)
-            return [];
-        var last = array[0];
-        var deduplicated = [last];
-        for (var i = 1; i < array.length; i++) {
-            var next = array[i];
-            switch (comparer(next, last)) {
-                // equality comparison
-                case true:
-                // relational comparison
-                case 0 /* EqualTo */:
-                    continue;
-                case -1 /* LessThan */:
-                    // If `array` is sorted, `next` should **never** be less than `last`.
-                    return Debug.fail("Array is unsorted.");
-            }
-            deduplicated.push(last = next);
-        }
-        return deduplicated;
-    }
-    function insertSorted(array, insert, compare) {
-        if (array.length === 0) {
-            array.push(insert);
-            return;
-        }
-        var insertIndex = binarySearch(array, insert, identity, compare);
-        if (insertIndex < 0) {
-            array.splice(~insertIndex, 0, insert);
-        }
-    }
-    ts.insertSorted = insertSorted;
-    function sortAndDeduplicate(array, comparer, equalityComparer) {
-        return deduplicateSorted(sort(array, comparer), equalityComparer || comparer);
-    }
-    ts.sortAndDeduplicate = sortAndDeduplicate;
-    function arrayIsEqualTo(array1, array2, equalityComparer) {
-        if (equalityComparer === void 0) { equalityComparer = equateValues; }
-        if (!array1 || !array2) {
-            return array1 === array2;
-        }
-        if (array1.length !== array2.length) {
-            return false;
-        }
-        for (var i = 0; i < array1.length; i++) {
-            if (!equalityComparer(array1[i], array2[i])) {
-                return false;
-            }
-        }
-        return true;
-    }
-    ts.arrayIsEqualTo = arrayIsEqualTo;
-    function changesAffectModuleResolution(oldOptions, newOptions) {
-        return !oldOptions ||
-            (oldOptions.module !== newOptions.module) ||
-            (oldOptions.moduleResolution !== newOptions.moduleResolution) ||
-            (oldOptions.noResolve !== newOptions.noResolve) ||
-            (oldOptions.target !== newOptions.target) ||
-            (oldOptions.noLib !== newOptions.noLib) ||
-            (oldOptions.jsx !== newOptions.jsx) ||
-            (oldOptions.allowJs !== newOptions.allowJs) ||
-            (oldOptions.rootDir !== newOptions.rootDir) ||
-            (oldOptions.configFilePath !== newOptions.configFilePath) ||
-            (oldOptions.baseUrl !== newOptions.baseUrl) ||
-            (oldOptions.maxNodeModuleJsDepth !== newOptions.maxNodeModuleJsDepth) ||
-            !arrayIsEqualTo(oldOptions.lib, newOptions.lib) ||
-            !arrayIsEqualTo(oldOptions.typeRoots, newOptions.typeRoots) ||
-            !arrayIsEqualTo(oldOptions.rootDirs, newOptions.rootDirs) ||
-            !equalOwnProperties(oldOptions.paths, newOptions.paths);
-    }
-    ts.changesAffectModuleResolution = changesAffectModuleResolution;
-    function compact(array) {
-        var result;
-        if (array) {
-            for (var i = 0; i < array.length; i++) {
-                var v = array[i];
-                if (result || !v) {
-                    if (!result) {
-                        result = array.slice(0, i);
-                    }
-                    if (v) {
-                        result.push(v);
-                    }
-                }
-            }
-        }
-        return result || array;
-    }
-    ts.compact = compact;
-    /**
-     * Gets the relative complement of `arrayA` with respect to `arrayB`, returning the elements that
-     * are not present in `arrayA` but are present in `arrayB`. Assumes both arrays are sorted
-     * based on the provided comparer.
-     */
-    function relativeComplement(arrayA, arrayB, comparer) {
-        if (!arrayB || !arrayA || arrayB.length === 0 || arrayA.length === 0)
-            return arrayB;
-        var result = [];
-        loopB: for (var offsetA = 0, offsetB = 0; offsetB < arrayB.length; offsetB++) {
-            if (offsetB > 0) {
-                // Ensure `arrayB` is properly sorted.
-                Debug.assertGreaterThanOrEqual(comparer(arrayB[offsetB], arrayB[offsetB - 1]), 0 /* EqualTo */);
-            }
-            loopA: for (var startA = offsetA; offsetA < arrayA.length; offsetA++) {
-                if (offsetA > startA) {
-                    // Ensure `arrayA` is properly sorted. We only need to perform this check if
-                    // `offsetA` has changed since we entered the loop.
-                    Debug.assertGreaterThanOrEqual(comparer(arrayA[offsetA], arrayA[offsetA - 1]), 0 /* EqualTo */);
-                }
-                switch (comparer(arrayB[offsetB], arrayA[offsetA])) {
-                    case -1 /* LessThan */:
-                        // If B is less than A, B does not exist in arrayA. Add B to the result and
-                        // move to the next element in arrayB without changing the current position
-                        // in arrayA.
-                        result.push(arrayB[offsetB]);
-                        continue loopB;
-                    case 0 /* EqualTo */:
-                        // If B is equal to A, B exists in arrayA. Move to the next element in
-                        // arrayB without adding B to the result or changing the current position
-                        // in arrayA.
-                        continue loopB;
-                    case 1 /* GreaterThan */:
-                        // If B is greater than A, we need to keep looking for B in arrayA. Move to
-                        // the next element in arrayA and recheck.
-                        continue loopA;
-                }
-            }
-        }
-        return result;
-    }
-    ts.relativeComplement = relativeComplement;
-    function sum(array, prop) {
-        var result = 0;
-        for (var _i = 0, array_5 = array; _i < array_5.length; _i++) {
-            var v = array_5[_i];
-            result += v[prop];
-        }
-        return result;
-    }
-    ts.sum = sum;
-    function append(to, value) {
-        if (value === undefined)
-            return to;
-        if (to === undefined)
-            return [value];
-        to.push(value);
-        return to;
-    }
-    ts.append = append;
-    /**
-     * Gets the actual offset into an array for a relative offset. Negative offsets indicate a
-     * position offset from the end of the array.
-     */
-    function toOffset(array, offset) {
-        return offset < 0 ? array.length + offset : offset;
-    }
-    function addRange(to, from, start, end) {
-        if (from === undefined || from.length === 0)
-            return to;
-        if (to === undefined)
-            return from.slice(start, end);
-        start = start === undefined ? 0 : toOffset(from, start);
-        end = end === undefined ? from.length : toOffset(from, end);
-        for (var i = start; i < end && i < from.length; i++) {
-            if (from[i] !== undefined) {
-                to.push(from[i]);
-            }
-        }
-        return to;
-    }
-    ts.addRange = addRange;
-    /**
-     * @return Whether the value was added.
-     */
-    function pushIfUnique(array, toAdd, equalityComparer) {
-        if (contains(array, toAdd, equalityComparer)) {
-            return false;
-        }
-        else {
-            array.push(toAdd);
-            return true;
-        }
-    }
-    ts.pushIfUnique = pushIfUnique;
-    /**
-     * Unlike `pushIfUnique`, this can take `undefined` as an input, and returns a new array.
-     */
-    function appendIfUnique(array, toAdd, equalityComparer) {
-        if (array) {
-            pushIfUnique(array, toAdd, equalityComparer);
-            return array;
-        }
-        else {
-            return [toAdd];
-        }
-    }
-    ts.appendIfUnique = appendIfUnique;
-    function stableSortIndices(array, indices, comparer) {
-        // sort indices by value then position
-        indices.sort(function (x, y) { return comparer(array[x], array[y]) || compareValues(x, y); });
-    }
-    /**
-     * Returns a new sorted array.
-     */
-    function sort(array, comparer) {
-        return array.slice().sort(comparer);
-    }
-    ts.sort = sort;
-    function best(iter, isBetter) {
-        var x = iter.next();
-        if (x.done) {
-            return undefined;
-        }
-        var best = x.value;
-        while (true) {
-            var _a = iter.next(), value = _a.value, done = _a.done;
-            if (done) {
-                return best;
-            }
-            if (isBetter(value, best)) {
-                best = value;
-            }
-        }
-    }
-    ts.best = best;
-    function arrayIterator(array) {
-        var i = 0;
-        return { next: function () {
-                if (i === array.length) {
-                    return { value: undefined, done: true };
-                }
-                else {
-                    i++;
-                    return { value: array[i - 1], done: false };
-                }
-            } };
-    }
-    ts.arrayIterator = arrayIterator;
-    /**
-     * Stable sort of an array. Elements equal to each other maintain their relative position in the array.
-     */
-    function stableSort(array, comparer) {
-        var indices = array.map(function (_, i) { return i; });
-        stableSortIndices(array, indices, comparer);
-        return indices.map(function (i) { return array[i]; });
-    }
-    ts.stableSort = stableSort;
-    function rangeEquals(array1, array2, pos, end) {
-        while (pos < end) {
-            if (array1[pos] !== array2[pos]) {
-                return false;
-            }
-            pos++;
-        }
-        return true;
-    }
-    ts.rangeEquals = rangeEquals;
-    /**
-     * Returns the element at a specific offset in an array if non-empty, `undefined` otherwise.
-     * A negative offset indicates the element should be retrieved from the end of the array.
-     */
-    function elementAt(array, offset) {
-        if (array) {
-            offset = toOffset(array, offset);
-            if (offset < array.length) {
-                return array[offset];
-            }
-        }
-        return undefined;
-    }
-    ts.elementAt = elementAt;
-    /**
-     * Returns the first element of an array if non-empty, `undefined` otherwise.
-     */
-    function firstOrUndefined(array) {
-        return array.length === 0 ? undefined : array[0];
-    }
-    ts.firstOrUndefined = firstOrUndefined;
-    function first(array) {
-        Debug.assert(array.length !== 0);
-        return array[0];
-    }
-    ts.first = first;
-    /**
-     * Returns the last element of an array if non-empty, `undefined` otherwise.
-     */
-    function lastOrUndefined(array) {
-        return array.length === 0 ? undefined : array[array.length - 1];
-    }
-    ts.lastOrUndefined = lastOrUndefined;
-    function last(array) {
-        Debug.assert(array.length !== 0);
-        return array[array.length - 1];
-    }
-    ts.last = last;
-    /**
-     * Returns the only element of an array if it contains only one element, `undefined` otherwise.
-     */
-    function singleOrUndefined(array) {
-        return array && array.length === 1
-            ? array[0]
-            : undefined;
-    }
-    ts.singleOrUndefined = singleOrUndefined;
-    function singleOrMany(array) {
-        return array && array.length === 1
-            ? array[0]
-            : array;
-    }
-    ts.singleOrMany = singleOrMany;
-    function replaceElement(array, index, value) {
-        var result = array.slice(0);
-        result[index] = value;
-        return result;
-    }
-    ts.replaceElement = replaceElement;
-    /**
-     * Performs a binary search, finding the index at which `value` occurs in `array`.
-     * If no such index is found, returns the 2's-complement of first index at which
-     * `array[index]` exceeds `value`.
-     * @param array A sorted array whose first element must be no larger than number
-     * @param value The value to be searched for in the array.
-     * @param keySelector A callback used to select the search key from `value` and each element of
-     * `array`.
-     * @param keyComparer A callback used to compare two keys in a sorted array.
-     * @param offset An offset into `array` at which to start the search.
-     */
-    function binarySearch(array, value, keySelector, keyComparer, offset) {
-        if (!array || array.length === 0) {
-            return -1;
-        }
-        var low = offset || 0;
-        var high = array.length - 1;
-        var key = keySelector(value);
-        while (low <= high) {
-            var middle = low + ((high - low) >> 1);
-            var midKey = keySelector(array[middle]);
-            switch (keyComparer(midKey, key)) {
-                case -1 /* LessThan */:
-                    low = middle + 1;
-                    break;
-                case 0 /* EqualTo */:
-                    return middle;
-                case 1 /* GreaterThan */:
-                    high = middle - 1;
-                    break;
-            }
-        }
-        return ~low;
-    }
-    ts.binarySearch = binarySearch;
-    function reduceLeft(array, f, initial, start, count) {
-        if (array && array.length > 0) {
-            var size = array.length;
-            if (size > 0) {
-                var pos = start === undefined || start < 0 ? 0 : start;
-                var end = count === undefined || pos + count > size - 1 ? size - 1 : pos + count;
-                var result = void 0;
-                if (arguments.length <= 2) {
-                    result = array[pos];
-                    pos++;
-                }
-                else {
-                    result = initial;
-                }
-                while (pos <= end) {
-                    result = f(result, array[pos], pos);
-                    pos++;
-                }
-                return result;
-            }
-        }
-        return initial;
-    }
-    ts.reduceLeft = reduceLeft;
-    var hasOwnProperty = Object.prototype.hasOwnProperty;
-    /**
-     * Indicates whether a map-like contains an own property with the specified key.
-     *
-     * @param map A map-like.
-     * @param key A property key.
-     */
-    function hasProperty(map, key) {
-        return hasOwnProperty.call(map, key);
-    }
-    ts.hasProperty = hasProperty;
-    /**
-     * Gets the value of an owned property in a map-like.
-     *
-     * @param map A map-like.
-     * @param key A property key.
-     */
-    function getProperty(map, key) {
-        return hasOwnProperty.call(map, key) ? map[key] : undefined;
-    }
-    ts.getProperty = getProperty;
-    /**
-     * Gets the owned, enumerable property keys of a map-like.
-     */
-    function getOwnKeys(map) {
-        var keys = [];
-        for (var key in map) {
-            if (hasOwnProperty.call(map, key)) {
-                keys.push(key);
-            }
-        }
-        return keys;
-    }
-    ts.getOwnKeys = getOwnKeys;
-    function getOwnValues(sparseArray) {
-        var values = [];
-        for (var key in sparseArray) {
-            if (hasOwnProperty.call(sparseArray, key)) {
-                values.push(sparseArray[key]);
-            }
-        }
-        return values;
-    }
-    ts.getOwnValues = getOwnValues;
-    function arrayFrom(iterator, map) {
-        var _a;
-        var result = [];
-        for (var _b = iterator.next(), value = _b.value, done = _b.done; !done; _a = iterator.next(), value = _a.value, done = _a.done, _a) {
-            result.push(map ? map(value) : value);
-        }
-        return result;
-    }
-    ts.arrayFrom = arrayFrom;
-    function forEachEntry(map, callback) {
-        var _a;
-        var iterator = map.entries();
-        for (var _b = iterator.next(), pair = _b.value, done = _b.done; !done; _a = iterator.next(), pair = _a.value, done = _a.done, _a) {
-            var key = pair[0], value = pair[1];
-            var result = callback(value, key);
-            if (result) {
-                return result;
-            }
-        }
-        return undefined;
-    }
-    ts.forEachEntry = forEachEntry;
-    function forEachKey(map, callback) {
-        var _a;
-        var iterator = map.keys();
-        for (var _b = iterator.next(), key = _b.value, done = _b.done; !done; _a = iterator.next(), key = _a.value, done = _a.done, _a) {
-            var result = callback(key);
-            if (result) {
-                return result;
-            }
-        }
-        return undefined;
-    }
-    ts.forEachKey = forEachKey;
-    function copyEntries(source, target) {
-        source.forEach(function (value, key) {
-            target.set(key, value);
-        });
-    }
-    ts.copyEntries = copyEntries;
-    function assign(t) {
-        var args = [];
-        for (var _i = 1; _i < arguments.length; _i++) {
-            args[_i - 1] = arguments[_i];
-        }
-        for (var _a = 0, args_1 = args; _a < args_1.length; _a++) {
-            var arg = args_1[_a];
-            for (var p in arg) {
-                if (hasProperty(arg, p)) {
-                    t[p] = arg[p]; // TODO: GH#23368
-                }
-            }
-        }
-        return t;
-    }
-    ts.assign = assign;
-    /**
-     * Performs a shallow equality comparison of the contents of two map-likes.
-     *
-     * @param left A map-like whose properties should be compared.
-     * @param right A map-like whose properties should be compared.
-     */
-    function equalOwnProperties(left, right, equalityComparer) {
-        if (equalityComparer === void 0) { equalityComparer = equateValues; }
-        if (left === right)
-            return true;
-        if (!left || !right)
-            return false;
-        for (var key in left) {
-            if (hasOwnProperty.call(left, key)) {
-                if (!hasOwnProperty.call(right, key) === undefined)
-                    return false;
-                if (!equalityComparer(left[key], right[key]))
-                    return false;
-            }
-        }
-        for (var key in right) {
-            if (hasOwnProperty.call(right, key)) {
-                if (!hasOwnProperty.call(left, key))
-                    return false;
-            }
-        }
-        return true;
-    }
-    ts.equalOwnProperties = equalOwnProperties;
-    function arrayToMap(array, makeKey, makeValue) {
-        if (makeValue === void 0) { makeValue = identity; }
-        var result = createMap();
-        for (var _i = 0, array_6 = array; _i < array_6.length; _i++) {
-            var value = array_6[_i];
-            var key = makeKey(value);
-            if (key !== undefined)
-                result.set(key, makeValue(value));
-        }
-        return result;
-    }
-    ts.arrayToMap = arrayToMap;
-    function arrayToNumericMap(array, makeKey, makeValue) {
-        if (makeValue === void 0) { makeValue = identity; }
-        var result = [];
-        for (var _i = 0, array_7 = array; _i < array_7.length; _i++) {
-            var value = array_7[_i];
-            result[makeKey(value)] = makeValue(value);
-        }
-        return result;
-    }
-    ts.arrayToNumericMap = arrayToNumericMap;
-    function arrayToSet(array, makeKey) {
-        return arrayToMap(array, makeKey || (function (s) { return s; }), function () { return true; });
-    }
-    ts.arrayToSet = arrayToSet;
-    function arrayToMultiMap(values, makeKey, makeValue) {
-        if (makeValue === void 0) { makeValue = identity; }
-        var result = createMultiMap();
-        for (var _i = 0, values_1 = values; _i < values_1.length; _i++) {
-            var value = values_1[_i];
-            result.add(makeKey(value), makeValue(value));
-        }
-        return result;
-    }
-    ts.arrayToMultiMap = arrayToMultiMap;
-    function group(values, getGroupId) {
-        return arrayFrom(arrayToMultiMap(values, getGroupId).values());
-    }
-    ts.group = group;
-    function cloneMap(map) {
-        var clone = createMap();
-        copyEntries(map, clone);
-        return clone;
-    }
-    ts.cloneMap = cloneMap;
-    function clone(object) {
-        var result = {};
-        for (var id in object) {
-            if (hasOwnProperty.call(object, id)) {
-                result[id] = object[id];
-            }
-        }
-        return result;
-    }
-    ts.clone = clone;
-    function extend(first, second) {
-        var result = {};
-        for (var id in second) {
-            if (hasOwnProperty.call(second, id)) {
-                result[id] = second[id];
-            }
-        }
-        for (var id in first) {
-            if (hasOwnProperty.call(first, id)) {
-                result[id] = first[id];
-            }
-        }
-        return result;
-    }
-    ts.extend = extend;
-    function createMultiMap() {
-        var map = createMap();
-        map.add = multiMapAdd;
-        map.remove = multiMapRemove;
-        return map;
-    }
-    ts.createMultiMap = createMultiMap;
-    function multiMapAdd(key, value) {
-        var values = this.get(key);
-        if (values) {
-            values.push(value);
-        }
-        else {
-            this.set(key, values = [value]);
-        }
-        return values;
-    }
-    function multiMapRemove(key, value) {
-        var values = this.get(key);
-        if (values) {
-            unorderedRemoveItem(values, value);
-            if (!values.length) {
-                this.delete(key);
-            }
-        }
-    }
-    /**
-     * Tests whether a value is an array.
-     */
-    function isArray(value) {
-        return Array.isArray ? Array.isArray(value) : value instanceof Array;
-    }
-    ts.isArray = isArray;
-    function toArray(value) {
-        return isArray(value) ? value : [value];
-    }
-    ts.toArray = toArray;
-    /**
-     * Tests whether a value is string
-     */
-    function isString(text) {
-        return typeof text === "string";
-    }
-    ts.isString = isString;
-    function tryCast(value, test) {
-        return value !== undefined && test(value) ? value : undefined;
-    }
-    ts.tryCast = tryCast;
-    function cast(value, test) {
-        if (value !== undefined && test(value))
-            return value;
-        if (value && typeof value.kind === "number") {
-            return Debug.fail("Invalid cast. The supplied " + Debug.showSyntaxKind(value) + " did not pass the test '" + Debug.getFunctionName(test) + "'.");
-        }
-        else {
-            return Debug.fail("Invalid cast. The supplied value did not pass the test '" + Debug.getFunctionName(test) + "'.");
-        }
-    }
-    ts.cast = cast;
-    /** Does nothing. */
-    function noop(_) { } // tslint:disable-line no-empty
-    ts.noop = noop;
-    /** Do nothing and return false */
-    function returnFalse() { return false; }
-    ts.returnFalse = returnFalse;
-    /** Do nothing and return true */
-    function returnTrue() { return true; }
-    ts.returnTrue = returnTrue;
-    /** Returns its argument. */
-    function identity(x) { return x; }
-    ts.identity = identity;
-    /** Returns lower case string */
-    function toLowerCase(x) { return x.toLowerCase(); }
-    ts.toLowerCase = toLowerCase;
-    /** Throws an error because a function is not implemented. */
-    function notImplemented() {
-        throw new Error("Not implemented");
-    }
-    ts.notImplemented = notImplemented;
-    function memoize(callback) {
-        var value;
-        return function () {
-            if (callback) {
-                value = callback();
-                callback = undefined;
-            }
-            return value;
-        };
-    }
-    ts.memoize = memoize;
-    function chain(a, b, c, d, e) {
-        if (e) {
-            var args_2 = [];
-            for (var i = 0; i < arguments.length; i++) {
-                args_2[i] = arguments[i];
-            }
-            return function (t) { return compose.apply(void 0, map(args_2, function (f) { return f(t); })); };
-        }
-        else if (d) {
-            return function (t) { return compose(a(t), b(t), c(t), d(t)); };
-        }
-        else if (c) {
-            return function (t) { return compose(a(t), b(t), c(t)); };
-        }
-        else if (b) {
-            return function (t) { return compose(a(t), b(t)); };
-        }
-        else if (a) {
-            return function (t) { return compose(a(t)); };
-        }
-        else {
-            return function (_) { return function (u) { return u; }; };
-        }
-    }
-    ts.chain = chain;
-    function compose(a, b, c, d, e) {
-        if (e) {
-            var args_3 = [];
-            for (var i = 0; i < arguments.length; i++) {
-                args_3[i] = arguments[i];
-            }
-            return function (t) { return reduceLeft(args_3, function (u, f) { return f(u); }, t); };
-        }
-        else if (d) {
-            return function (t) { return d(c(b(a(t)))); };
-        }
-        else if (c) {
-            return function (t) { return c(b(a(t))); };
-        }
-        else if (b) {
-            return function (t) { return b(a(t)); };
-        }
-        else if (a) {
-            return function (t) { return a(t); };
-        }
-        else {
-            return function (t) { return t; };
-        }
-    }
-    ts.compose = compose;
-    function formatStringFromArgs(text, args, baseIndex) {
-        if (baseIndex === void 0) { baseIndex = 0; }
-        return text.replace(/{(\d+)}/g, function (_match, index) { return Debug.assertDefined(args[+index + baseIndex]); });
-    }
-    ts.formatStringFromArgs = formatStringFromArgs;
-    function getLocaleSpecificMessage(message) {
-        return ts.localizedDiagnosticMessages && ts.localizedDiagnosticMessages[message.key] || message.message;
-    }
-    ts.getLocaleSpecificMessage = getLocaleSpecificMessage;
-    function createFileDiagnostic(file, start, length, message) {
-        Debug.assertGreaterThanOrEqual(start, 0);
-        Debug.assertGreaterThanOrEqual(length, 0);
-        if (file) {
-            Debug.assertLessThanOrEqual(start, file.text.length);
-            Debug.assertLessThanOrEqual(start + length, file.text.length);
-        }
-        var text = getLocaleSpecificMessage(message);
-        if (arguments.length > 4) {
-            text = formatStringFromArgs(text, arguments, 4);
-        }
-        return {
-            file: file,
-            start: start,
-            length: length,
-            messageText: text,
-            category: message.category,
-            code: message.code,
-            reportsUnnecessary: message.reportsUnnecessary,
-        };
-    }
-    ts.createFileDiagnostic = createFileDiagnostic;
-    /* internal */
-    function formatMessage(_dummy, message) {
-        var text = getLocaleSpecificMessage(message);
-        if (arguments.length > 2) {
-            text = formatStringFromArgs(text, arguments, 2);
-        }
-        return text;
-    }
-    ts.formatMessage = formatMessage;
-    function createCompilerDiagnostic(message) {
-        var text = getLocaleSpecificMessage(message);
-        if (arguments.length > 1) {
-            text = formatStringFromArgs(text, arguments, 1);
-        }
-        return {
-            file: undefined,
-            start: undefined,
-            length: undefined,
-            messageText: text,
-            category: message.category,
-            code: message.code,
-            reportsUnnecessary: message.reportsUnnecessary,
-        };
-    }
-    ts.createCompilerDiagnostic = createCompilerDiagnostic;
-    function createCompilerDiagnosticFromMessageChain(chain) {
-        return {
-            file: undefined,
-            start: undefined,
-            length: undefined,
-            code: chain.code,
-            category: chain.category,
-            messageText: chain.next ? chain : chain.messageText,
-        };
-    }
-    ts.createCompilerDiagnosticFromMessageChain = createCompilerDiagnosticFromMessageChain;
-    function chainDiagnosticMessages(details, message) {
-        var text = getLocaleSpecificMessage(message);
-        if (arguments.length > 2) {
-            text = formatStringFromArgs(text, arguments, 2);
-        }
-        return {
-            messageText: text,
-            category: message.category,
-            code: message.code,
-            next: details
-        };
-    }
-    ts.chainDiagnosticMessages = chainDiagnosticMessages;
-    function concatenateDiagnosticMessageChains(headChain, tailChain) {
-        var lastChain = headChain;
-        while (lastChain.next) {
-            lastChain = lastChain.next;
-        }
-        lastChain.next = tailChain;
-        return headChain;
-    }
-    ts.concatenateDiagnosticMessageChains = concatenateDiagnosticMessageChains;
-    function equateValues(a, b) {
-        return a === b;
-    }
-    ts.equateValues = equateValues;
-    /**
-     * Compare the equality of two strings using a case-sensitive ordinal comparison.
-     *
-     * Case-sensitive comparisons compare both strings one code-point at a time using the integer
-     * value of each code-point after applying `toUpperCase` to each string. We always map both
-     * strings to their upper-case form as some unicode characters do not properly round-trip to
-     * lowercase (such as `ẞ` (German sharp capital s)).
-     */
-    function equateStringsCaseInsensitive(a, b) {
-        return a === b
-            || a !== undefined
-                && b !== undefined
-                && a.toUpperCase() === b.toUpperCase();
-    }
-    ts.equateStringsCaseInsensitive = equateStringsCaseInsensitive;
-    /**
-     * Compare the equality of two strings using a case-sensitive ordinal comparison.
-     *
-     * Case-sensitive comparisons compare both strings one code-point at a time using the
-     * integer value of each code-point.
-     */
-    function equateStringsCaseSensitive(a, b) {
-        return equateValues(a, b);
-    }
-    ts.equateStringsCaseSensitive = equateStringsCaseSensitive;
-    function compareComparableValues(a, b) {
-        return a === b ? 0 /* EqualTo */ :
-            a === undefined ? -1 /* LessThan */ :
-                b === undefined ? 1 /* GreaterThan */ :
-                    a < b ? -1 /* LessThan */ :
-                        1 /* GreaterThan */;
-    }
-    /**
-     * Compare two numeric values for their order relative to each other.
-     * To compare strings, use any of the `compareStrings` functions.
-     */
-    function compareValues(a, b) {
-        return compareComparableValues(a, b);
-    }
-    ts.compareValues = compareValues;
-    function min(a, b, compare) {
-        return compare(a, b) === -1 /* LessThan */ ? a : b;
-    }
-    ts.min = min;
-    /**
-     * Compare two strings using a case-insensitive ordinal comparison.
-     *
-     * Ordinal comparisons are based on the difference between the unicode code points of both
-     * strings. Characters with multiple unicode representations are considered unequal. Ordinal
-     * comparisons provide predictable ordering, but place "a" after "B".
-     *
-     * Case-insensitive comparisons compare both strings one code-point at a time using the integer
-     * value of each code-point after applying `toUpperCase` to each string. We always map both
-     * strings to their upper-case form as some unicode characters do not properly round-trip to
-     * lowercase (such as `ẞ` (German sharp capital s)).
-     */
-    function compareStringsCaseInsensitive(a, b) {
-        if (a === b)
-            return 0 /* EqualTo */;
-        if (a === undefined)
-            return -1 /* LessThan */;
-        if (b === undefined)
-            return 1 /* GreaterThan */;
-        a = a.toUpperCase();
-        b = b.toUpperCase();
-        return a < b ? -1 /* LessThan */ : a > b ? 1 /* GreaterThan */ : 0 /* EqualTo */;
-    }
-    ts.compareStringsCaseInsensitive = compareStringsCaseInsensitive;
-    /**
-     * Compare two strings using a case-sensitive ordinal comparison.
-     *
-     * Ordinal comparisons are based on the difference between the unicode code points of both
-     * strings. Characters with multiple unicode representations are considered unequal. Ordinal
-     * comparisons provide predictable ordering, but place "a" after "B".
-     *
-     * Case-sensitive comparisons compare both strings one code-point at a time using the integer
-     * value of each code-point.
-     */
-    function compareStringsCaseSensitive(a, b) {
-        return compareComparableValues(a, b);
-    }
-    ts.compareStringsCaseSensitive = compareStringsCaseSensitive;
-    function getStringComparer(ignoreCase) {
-        return ignoreCase ? compareStringsCaseInsensitive : compareStringsCaseSensitive;
-    }
-    ts.getStringComparer = getStringComparer;
-    /**
-     * Creates a string comparer for use with string collation in the UI.
-     */
-    var createUIStringComparer = (function () {
-        var defaultComparer;
-        var enUSComparer;
-        var stringComparerFactory = getStringComparerFactory();
-        return createStringComparer;
-        function compareWithCallback(a, b, comparer) {
-            if (a === b)
-                return 0 /* EqualTo */;
-            if (a === undefined)
-                return -1 /* LessThan */;
-            if (b === undefined)
-                return 1 /* GreaterThan */;
-            var value = comparer(a, b);
-            return value < 0 ? -1 /* LessThan */ : value > 0 ? 1 /* GreaterThan */ : 0 /* EqualTo */;
-        }
-        function createIntlCollatorStringComparer(locale) {
-            // Intl.Collator.prototype.compare is bound to the collator. See NOTE in
-            // http://www.ecma-international.org/ecma-402/2.0/#sec-Intl.Collator.prototype.compare
-            var comparer = new Intl.Collator(locale, { usage: "sort", sensitivity: "variant" }).compare;
-            return function (a, b) { return compareWithCallback(a, b, comparer); };
-        }
-        function createLocaleCompareStringComparer(locale) {
-            // if the locale is not the default locale (`undefined`), use the fallback comparer.
-            if (locale !== undefined)
-                return createFallbackStringComparer();
-            return function (a, b) { return compareWithCallback(a, b, compareStrings); };
-            function compareStrings(a, b) {
-                return a.localeCompare(b);
-            }
-        }
-        function createFallbackStringComparer() {
-            // An ordinal comparison puts "A" after "b", but for the UI we want "A" before "b".
-            // We first sort case insensitively.  So "Aaa" will come before "baa".
-            // Then we sort case sensitively, so "aaa" will come before "Aaa".
-            //
-            // For case insensitive comparisons we always map both strings to their
-            // upper-case form as some unicode characters do not properly round-trip to
-            // lowercase (such as `ẞ` (German sharp capital s)).
-            return function (a, b) { return compareWithCallback(a, b, compareDictionaryOrder); };
-            function compareDictionaryOrder(a, b) {
-                return compareStrings(a.toUpperCase(), b.toUpperCase()) || compareStrings(a, b);
-            }
-            function compareStrings(a, b) {
-                return a < b ? -1 /* LessThan */ : a > b ? 1 /* GreaterThan */ : 0 /* EqualTo */;
-            }
-        }
-        function getStringComparerFactory() {
-            // If the host supports Intl, we use it for comparisons using the default locale.
-            if (typeof Intl === "object" && typeof Intl.Collator === "function") {
-                return createIntlCollatorStringComparer;
-            }
-            // If the host does not support Intl, we fall back to localeCompare.
-            // localeCompare in Node v0.10 is just an ordinal comparison, so don't use it.
-            if (typeof String.prototype.localeCompare === "function" &&
-                typeof String.prototype.toLocaleUpperCase === "function" &&
-                "a".localeCompare("B") < 0) {
-                return createLocaleCompareStringComparer;
-            }
-            // Otherwise, fall back to ordinal comparison:
-            return createFallbackStringComparer;
-        }
-        function createStringComparer(locale) {
-            // Hold onto common string comparers. This avoids constantly reallocating comparers during
-            // tests.
-            if (locale === undefined) {
-                return defaultComparer || (defaultComparer = stringComparerFactory(locale));
-            }
-            else if (locale === "en-US") {
-                return enUSComparer || (enUSComparer = stringComparerFactory(locale));
-            }
-            else {
-                return stringComparerFactory(locale);
-            }
-        }
-    })();
-    var uiComparerCaseSensitive;
-    var uiLocale;
-    function getUILocale() {
-        return uiLocale;
-    }
-    ts.getUILocale = getUILocale;
-    function setUILocale(value) {
-        if (uiLocale !== value) {
-            uiLocale = value;
-            uiComparerCaseSensitive = undefined;
-        }
-    }
-    ts.setUILocale = setUILocale;
-    /**
-     * Compare two strings in a using the case-sensitive sort behavior of the UI locale.
-     *
-     * Ordering is not predictable between different host locales, but is best for displaying
-     * ordered data for UI presentation. Characters with multiple unicode representations may
-     * be considered equal.
-     *
-     * Case-sensitive comparisons compare strings that differ in base characters, or
-     * accents/diacritic marks, or case as unequal.
-     */
-    function compareStringsCaseSensitiveUI(a, b) {
-        var comparer = uiComparerCaseSensitive || (uiComparerCaseSensitive = createUIStringComparer(uiLocale));
-        return comparer(a, b);
-    }
-    ts.compareStringsCaseSensitiveUI = compareStringsCaseSensitiveUI;
-    function compareProperties(a, b, key, comparer) {
-        return a === b ? 0 /* EqualTo */ :
-            a === undefined ? -1 /* LessThan */ :
-                b === undefined ? 1 /* GreaterThan */ :
-                    comparer(a[key], b[key]);
-    }
-    ts.compareProperties = compareProperties;
-    function getDiagnosticFilePath(diagnostic) {
-        return diagnostic.file ? diagnostic.file.path : undefined;
-    }
-    function compareDiagnostics(d1, d2) {
-        return compareStringsCaseSensitive(getDiagnosticFilePath(d1), getDiagnosticFilePath(d2)) ||
-            compareValues(d1.start, d2.start) ||
-            compareValues(d1.length, d2.length) ||
-            compareValues(d1.code, d2.code) ||
-            compareMessageText(d1.messageText, d2.messageText) ||
-            0 /* EqualTo */;
-    }
-    ts.compareDiagnostics = compareDiagnostics;
-    /** True is greater than false. */
-    function compareBooleans(a, b) {
-        return compareValues(a ? 1 : 0, b ? 1 : 0);
-    }
-    ts.compareBooleans = compareBooleans;
-    function compareMessageText(t1, t2) {
-        var text1 = t1;
-        var text2 = t2;
-        while (text1 && text2) {
-            // We still have both chains.
-            var string1 = isString(text1) ? text1 : text1.messageText;
-            var string2 = isString(text2) ? text2 : text2.messageText;
-            var res = compareStringsCaseSensitive(string1, string2);
-            if (res) {
-                return res;
-            }
-            text1 = isString(text1) ? undefined : text1.next;
-            text2 = isString(text2) ? undefined : text2.next;
-        }
-        if (!text1 && !text2) {
-            // if the chains are done, then these messages are the same.
-            return 0 /* EqualTo */;
-        }
-        // We still have one chain remaining.  The shorter chain should come first.
-        return text1 ? 1 /* GreaterThan */ : -1 /* LessThan */;
-    }
-    function getEmitScriptTarget(compilerOptions) {
-        return compilerOptions.target || 0 /* ES3 */;
-    }
-    ts.getEmitScriptTarget = getEmitScriptTarget;
-    function getEmitModuleKind(compilerOptions) {
-        return typeof compilerOptions.module === "number" ?
-            compilerOptions.module :
-            getEmitScriptTarget(compilerOptions) >= 2 /* ES2015 */ ? ts.ModuleKind.ES2015 : ts.ModuleKind.CommonJS;
-    }
-    ts.getEmitModuleKind = getEmitModuleKind;
-    function getEmitModuleResolutionKind(compilerOptions) {
-        var moduleResolution = compilerOptions.moduleResolution;
-        if (moduleResolution === undefined) {
-            moduleResolution = getEmitModuleKind(compilerOptions) === ts.ModuleKind.CommonJS ? ts.ModuleResolutionKind.NodeJs : ts.ModuleResolutionKind.Classic;
-        }
-        return moduleResolution;
-    }
-    ts.getEmitModuleResolutionKind = getEmitModuleResolutionKind;
-    function unreachableCodeIsError(options) {
-        return options.allowUnreachableCode === false;
-    }
-    ts.unreachableCodeIsError = unreachableCodeIsError;
-    function unusedLabelIsError(options) {
-        return options.allowUnusedLabels === false;
-    }
-    ts.unusedLabelIsError = unusedLabelIsError;
-    function getAreDeclarationMapsEnabled(options) {
-        return !!(options.declaration && options.declarationMap);
-    }
-    ts.getAreDeclarationMapsEnabled = getAreDeclarationMapsEnabled;
-    function getAllowSyntheticDefaultImports(compilerOptions) {
-        var moduleKind = getEmitModuleKind(compilerOptions);
-        return compilerOptions.allowSyntheticDefaultImports !== undefined
-            ? compilerOptions.allowSyntheticDefaultImports
-            : compilerOptions.esModuleInterop
-                ? moduleKind !== ts.ModuleKind.None && moduleKind < ts.ModuleKind.ES2015
-                : moduleKind === ts.ModuleKind.System;
-    }
-    ts.getAllowSyntheticDefaultImports = getAllowSyntheticDefaultImports;
-    function getEmitDeclarations(compilerOptions) {
-        return !!(compilerOptions.declaration || compilerOptions.composite);
-    }
-    ts.getEmitDeclarations = getEmitDeclarations;
-    function getStrictOptionValue(compilerOptions, flag) {
-        return compilerOptions[flag] === undefined ? !!compilerOptions.strict : !!compilerOptions[flag];
-    }
-    ts.getStrictOptionValue = getStrictOptionValue;
-    function hasZeroOrOneAsteriskCharacter(str) {
-        var seenAsterisk = false;
-        for (var i = 0; i < str.length; i++) {
-            if (str.charCodeAt(i) === 42 /* asterisk */) {
-                if (!seenAsterisk) {
-                    seenAsterisk = true;
-                }
-                else {
-                    // have already seen asterisk
-                    return false;
-                }
-            }
-        }
-        return true;
-    }
-    ts.hasZeroOrOneAsteriskCharacter = hasZeroOrOneAsteriskCharacter;
-    //
-    // Paths
-    //
-    /**
-     * Internally, we represent paths as strings with '/' as the directory separator.
-     * When we make system calls (eg: LanguageServiceHost.getDirectory()),
-     * we expect the host to correctly handle paths in our specified format.
-     */
-    ts.directorySeparator = "/";
-    var altDirectorySeparator = "\\";
-    var urlSchemeSeparator = "://";
-    var backslashRegExp = /\\/g;
-    /**
-     * Normalize path separators.
-     */
-    function normalizeSlashes(path) {
-        return path.replace(backslashRegExp, ts.directorySeparator);
-    }
-    ts.normalizeSlashes = normalizeSlashes;
-    function isVolumeCharacter(charCode) {
-        return (charCode >= 97 /* a */ && charCode <= 122 /* z */) ||
-            (charCode >= 65 /* A */ && charCode <= 90 /* Z */);
-    }
-    function getFileUrlVolumeSeparatorEnd(url, start) {
-        var ch0 = url.charCodeAt(start);
-        if (ch0 === 58 /* colon */)
-            return start + 1;
-        if (ch0 === 37 /* percent */ && url.charCodeAt(start + 1) === 51 /* _3 */) {
-            var ch2 = url.charCodeAt(start + 2);
-            if (ch2 === 97 /* a */ || ch2 === 65 /* A */)
-                return start + 3;
-        }
-        return -1;
-    }
-    /**
-     * Returns length of the root part of a path or URL (i.e. length of "/", "x:/", "//server/share/, file:///user/files").
-     * If the root is part of a URL, the twos-complement of the root length is returned.
-     */
-    function getEncodedRootLength(path) {
-        if (!path)
-            return 0;
-        var ch0 = path.charCodeAt(0);
-        // POSIX or UNC
-        if (ch0 === 47 /* slash */ || ch0 === 92 /* backslash */) {
-            if (path.charCodeAt(1) !== ch0)
-                return 1; // POSIX: "/" (or non-normalized "\")
-            var p1 = path.indexOf(ch0 === 47 /* slash */ ? ts.directorySeparator : altDirectorySeparator, 2);
-            if (p1 < 0)
-                return path.length; // UNC: "//server" or "\\server"
-            return p1 + 1; // UNC: "//server/" or "\\server\"
-        }
-        // DOS
-        if (isVolumeCharacter(ch0) && path.charCodeAt(1) === 58 /* colon */) {
-            var ch2 = path.charCodeAt(2);
-            if (ch2 === 47 /* slash */ || ch2 === 92 /* backslash */)
-                return 3; // DOS: "c:/" or "c:\"
-            if (path.length === 2)
-                return 2; // DOS: "c:" (but not "c:d")
-        }
-        // URL
-        var schemeEnd = path.indexOf(urlSchemeSeparator);
-        if (schemeEnd !== -1) {
-            var authorityStart = schemeEnd + urlSchemeSeparator.length;
-            var authorityEnd = path.indexOf(ts.directorySeparator, authorityStart);
-            if (authorityEnd !== -1) { // URL: "file:///", "file://server/", "file://server/path"
-                // For local "file" URLs, include the leading DOS volume (if present).
-                // Per https://www.ietf.org/rfc/rfc1738.txt, a host of "" or "localhost" is a
-                // special case interpreted as "the machine from which the URL is being interpreted".
-                var scheme = path.slice(0, schemeEnd);
-                var authority = path.slice(authorityStart, authorityEnd);
-                if (scheme === "file" && (authority === "" || authority === "localhost") &&
-                    isVolumeCharacter(path.charCodeAt(authorityEnd + 1))) {
-                    var volumeSeparatorEnd = getFileUrlVolumeSeparatorEnd(path, authorityEnd + 2);
-                    if (volumeSeparatorEnd !== -1) {
-                        if (path.charCodeAt(volumeSeparatorEnd) === 47 /* slash */) {
-                            // URL: "file:///c:/", "file://localhost/c:/", "file:///c%3a/", "file://localhost/c%3a/"
-                            return ~(volumeSeparatorEnd + 1);
-                        }
-                        if (volumeSeparatorEnd === path.length) {
-                            // URL: "file:///c:", "file://localhost/c:", "file:///c$3a", "file://localhost/c%3a"
-                            // but not "file:///c:d" or "file:///c%3ad"
-                            return ~volumeSeparatorEnd;
-                        }
-                    }
-                }
-                return ~(authorityEnd + 1); // URL: "file://server/", "http://server/"
-            }
-            return ~path.length; // URL: "file://server", "http://server"
-        }
-        // relative
-        return 0;
-    }
-    /**
-     * Returns length of the root part of a path or URL (i.e. length of "/", "x:/", "//server/share/, file:///user/files").
-     *
-     * For example:
-     * ```ts
-     * getRootLength("a") === 0                   // ""
-     * getRootLength("/") === 1                   // "/"
-     * getRootLength("c:") === 2                  // "c:"
-     * getRootLength("c:d") === 0                 // ""
-     * getRootLength("c:/") === 3                 // "c:/"
-     * getRootLength("c:\\") === 3                // "c:\\"
-     * getRootLength("//server") === 7            // "//server"
-     * getRootLength("//server/share") === 8      // "//server/"
-     * getRootLength("\\\\server") === 7          // "\\\\server"
-     * getRootLength("\\\\server\\share") === 8   // "\\\\server\\"
-     * getRootLength("file:///path") === 8        // "file:///"
-     * getRootLength("file:///c:") === 10         // "file:///c:"
-     * getRootLength("file:///c:d") === 8         // "file:///"
-     * getRootLength("file:///c:/path") === 11    // "file:///c:/"
-     * getRootLength("file://server") === 13      // "file://server"
-     * getRootLength("file://server/path") === 14 // "file://server/"
-     * getRootLength("http://server") === 13      // "http://server"
-     * getRootLength("http://server/path") === 14 // "http://server/"
-     * ```
-     */
-    function getRootLength(path) {
-        var rootLength = getEncodedRootLength(path);
-        return rootLength < 0 ? ~rootLength : rootLength;
-    }
-    ts.getRootLength = getRootLength;
-    // TODO(rbuckton): replace references with `resolvePath`
-    function normalizePath(path) {
-        return resolvePath(path);
-    }
-    ts.normalizePath = normalizePath;
-    function normalizePathAndParts(path) {
-        path = normalizeSlashes(path);
-        var _a = reducePathComponents(getPathComponents(path)), root = _a[0], parts = _a.slice(1);
-        if (parts.length) {
-            var joinedParts = root + parts.join(ts.directorySeparator);
-            return { path: hasTrailingDirectorySeparator(path) ? ensureTrailingDirectorySeparator(joinedParts) : joinedParts, parts: parts };
-        }
-        else {
-            return { path: root, parts: parts };
-        }
-    }
-    ts.normalizePathAndParts = normalizePathAndParts;
-    function getDirectoryPath(path) {
-        path = normalizeSlashes(path);
-        // If the path provided is itself the root, then return it.
-        var rootLength = getRootLength(path);
-        if (rootLength === path.length)
-            return path;
-        // return the leading portion of the path up to the last (non-terminal) directory separator
-        // but not including any trailing directory separator.
-        path = removeTrailingDirectorySeparator(path);
-        return path.slice(0, Math.max(rootLength, path.lastIndexOf(ts.directorySeparator)));
-    }
-    ts.getDirectoryPath = getDirectoryPath;
-    function isUrl(path) {
-        return getEncodedRootLength(path) < 0;
-    }
-    ts.isUrl = isUrl;
-    function pathIsRelative(path) {
-        return /^\.\.?($|[\\/])/.test(path);
-    }
-    ts.pathIsRelative = pathIsRelative;
-    /**
-     * Determines whether a path is an absolute path (e.g. starts with `/`, or a dos path
-     * like `c:`, `c:\` or `c:/`).
-     */
-    function isRootedDiskPath(path) {
-        return getEncodedRootLength(path) > 0;
-    }
-    ts.isRootedDiskPath = isRootedDiskPath;
-    /**
-     * Determines whether a path consists only of a path root.
-     */
-    function isDiskPathRoot(path) {
-        var rootLength = getEncodedRootLength(path);
-        return rootLength > 0 && rootLength === path.length;
-    }
-    ts.isDiskPathRoot = isDiskPathRoot;
-    function convertToRelativePath(absoluteOrRelativePath, basePath, getCanonicalFileName) {
-        return !isRootedDiskPath(absoluteOrRelativePath)
-            ? absoluteOrRelativePath
-            : getRelativePathToDirectoryOrUrl(basePath, absoluteOrRelativePath, basePath, getCanonicalFileName, /*isAbsolutePathAnUrl*/ false);
-    }
-    ts.convertToRelativePath = convertToRelativePath;
-    function pathComponents(path, rootLength) {
-        var root = path.substring(0, rootLength);
-        var rest = path.substring(rootLength).split(ts.directorySeparator);
-        if (rest.length && !lastOrUndefined(rest))
-            rest.pop();
-        return [root].concat(rest);
-    }
-    /**
-     * Parse a path into an array containing a root component (at index 0) and zero or more path
-     * components (at indices > 0). The result is not normalized.
-     * If the path is relative, the root component is `""`.
-     * If the path is absolute, the root component includes the first path separator (`/`).
-     */
-    function getPathComponents(path, currentDirectory) {
-        if (currentDirectory === void 0) { currentDirectory = ""; }
-        path = combinePaths(currentDirectory, path);
-        var rootLength = getRootLength(path);
-        return pathComponents(path, rootLength);
-    }
-    ts.getPathComponents = getPathComponents;
-    /**
-     * Reduce an array of path components to a more simplified path by navigating any
-     * `"."` or `".."` entries in the path.
-     */
-    function reducePathComponents(components) {
-        if (!some(components))
-            return [];
-        var reduced = [components[0]];
-        for (var i = 1; i < components.length; i++) {
-            var component = components[i];
-            if (!component)
-                continue;
-            if (component === ".")
-                continue;
-            if (component === "..") {
-                if (reduced.length > 1) {
-                    if (reduced[reduced.length - 1] !== "..") {
-                        reduced.pop();
-                        continue;
-                    }
-                }
-                else if (reduced[0])
-                    continue;
-            }
-            reduced.push(component);
-        }
-        return reduced;
-    }
-    ts.reducePathComponents = reducePathComponents;
-    /**
-     * Parse a path into an array containing a root component (at index 0) and zero or more path
-     * components (at indices > 0). The result is normalized.
-     * If the path is relative, the root component is `""`.
-     * If the path is absolute, the root component includes the first path separator (`/`).
-     */
-    function getNormalizedPathComponents(path, currentDirectory) {
-        return reducePathComponents(getPathComponents(path, currentDirectory));
-    }
-    ts.getNormalizedPathComponents = getNormalizedPathComponents;
-    function getNormalizedAbsolutePath(fileName, currentDirectory) {
-        return getPathFromPathComponents(getNormalizedPathComponents(fileName, currentDirectory));
-    }
-    ts.getNormalizedAbsolutePath = getNormalizedAbsolutePath;
-    /**
-     * Formats a parsed path consisting of a root component (at index 0) and zero or more path
-     * segments (at indices > 0).
-     */
-    function getPathFromPathComponents(pathComponents) {
-        if (pathComponents.length === 0)
-            return "";
-        var root = pathComponents[0] && ensureTrailingDirectorySeparator(pathComponents[0]);
-        if (pathComponents.length === 1)
-            return root;
-        return root + pathComponents.slice(1).join(ts.directorySeparator);
-    }
-    ts.getPathFromPathComponents = getPathFromPathComponents;
-    function getPathComponentsRelativeTo(from, to, stringEqualityComparer, getCanonicalFileName) {
-        var fromComponents = reducePathComponents(getPathComponents(from));
-        var toComponents = reducePathComponents(getPathComponents(to));
-        var start;
-        for (start = 0; start < fromComponents.length && start < toComponents.length; start++) {
-            var fromComponent = getCanonicalFileName(fromComponents[start]);
-            var toComponent = getCanonicalFileName(toComponents[start]);
-            var comparer = start === 0 ? equateStringsCaseInsensitive : stringEqualityComparer;
-            if (!comparer(fromComponent, toComponent))
-                break;
-        }
-        if (start === 0) {
-            return toComponents;
-        }
-        var components = toComponents.slice(start);
-        var relative = [];
-        for (; start < fromComponents.length; start++) {
-            relative.push("..");
-        }
-        return [""].concat(relative, components);
-    }
-    function getRelativePathFromFile(from, to, getCanonicalFileName) {
-        return ensurePathIsNonModuleName(getRelativePathFromDirectory(getDirectoryPath(from), to, getCanonicalFileName));
-    }
-    ts.getRelativePathFromFile = getRelativePathFromFile;
-    function getRelativePathFromDirectory(fromDirectory, to, getCanonicalFileNameOrIgnoreCase) {
-        Debug.assert((getRootLength(fromDirectory) > 0) === (getRootLength(to) > 0), "Paths must either both be absolute or both be relative");
-        var getCanonicalFileName = typeof getCanonicalFileNameOrIgnoreCase === "function" ? getCanonicalFileNameOrIgnoreCase : identity;
-        var ignoreCase = typeof getCanonicalFileNameOrIgnoreCase === "boolean" ? getCanonicalFileNameOrIgnoreCase : false;
-        var pathComponents = getPathComponentsRelativeTo(fromDirectory, to, ignoreCase ? equateStringsCaseInsensitive : equateStringsCaseSensitive, getCanonicalFileName);
-        return getPathFromPathComponents(pathComponents);
-    }
-    ts.getRelativePathFromDirectory = getRelativePathFromDirectory;
-    function getRelativePathToDirectoryOrUrl(directoryPathOrUrl, relativeOrAbsolutePath, currentDirectory, getCanonicalFileName, isAbsolutePathAnUrl) {
-        var pathComponents = getPathComponentsRelativeTo(resolvePath(currentDirectory, directoryPathOrUrl), resolvePath(currentDirectory, relativeOrAbsolutePath), equateStringsCaseSensitive, getCanonicalFileName);
-        var firstComponent = pathComponents[0];
-        if (isAbsolutePathAnUrl && isRootedDiskPath(firstComponent)) {
-            var prefix = firstComponent.charAt(0) === ts.directorySeparator ? "file://" : "file:///";
-            pathComponents[0] = prefix + firstComponent;
-        }
-        return getPathFromPathComponents(pathComponents);
-    }
-    ts.getRelativePathToDirectoryOrUrl = getRelativePathToDirectoryOrUrl;
-    /**
-     * Ensures a path is either absolute (prefixed with `/` or `c:`) or dot-relative (prefixed
-     * with `./` or `../`) so as not to be confused with an unprefixed module name.
-     */
-    function ensurePathIsNonModuleName(path) {
-        return getRootLength(path) === 0 && !pathIsRelative(path) ? "./" + path : path;
-    }
-    ts.ensurePathIsNonModuleName = ensurePathIsNonModuleName;
-    function getBaseFileName(path, extensions, ignoreCase) {
-        path = normalizeSlashes(path);
-        // if the path provided is itself the root, then it has not file name.
-        var rootLength = getRootLength(path);
-        if (rootLength === path.length)
-            return "";
-        // return the trailing portion of the path starting after the last (non-terminal) directory
-        // separator but not including any trailing directory separator.
-        path = removeTrailingDirectorySeparator(path);
-        var name = path.slice(Math.max(getRootLength(path), path.lastIndexOf(ts.directorySeparator) + 1));
-        var extension = extensions !== undefined && ignoreCase !== undefined ? getAnyExtensionFromPath(name, extensions, ignoreCase) : undefined;
-        return extension ? name.slice(0, name.length - extension.length) : name;
-    }
-    ts.getBaseFileName = getBaseFileName;
-    /**
-     * Combines paths. If a path is absolute, it replaces any previous path.
-     */
-    function combinePaths(path) {
-        var paths = [];
-        for (var _i = 1; _i < arguments.length; _i++) {
-            paths[_i - 1] = arguments[_i];
-        }
-        if (path)
-            path = normalizeSlashes(path);
-        for (var _a = 0, paths_1 = paths; _a < paths_1.length; _a++) {
-            var relativePath = paths_1[_a];
-            if (!relativePath)
-                continue;
-            relativePath = normalizeSlashes(relativePath);
-            if (!path || getRootLength(relativePath) !== 0) {
-                path = relativePath;
-            }
-            else {
-                path = ensureTrailingDirectorySeparator(path) + relativePath;
-            }
-        }
-        return path;
-    }
-    ts.combinePaths = combinePaths;
-    /**
-     * Combines and resolves paths. If a path is absolute, it replaces any previous path. Any
-     * `.` and `..` path components are resolved.
-     */
-    function resolvePath(path) {
-        var paths = [];
-        for (var _i = 1; _i < arguments.length; _i++) {
-            paths[_i - 1] = arguments[_i];
-        }
-        var combined = some(paths) ? combinePaths.apply(void 0, [path].concat(paths)) : normalizeSlashes(path);
-        var normalized = getPathFromPathComponents(reducePathComponents(getPathComponents(combined)));
-        return normalized && hasTrailingDirectorySeparator(combined) ? ensureTrailingDirectorySeparator(normalized) : normalized;
-    }
-    ts.resolvePath = resolvePath;
-    /**
-     * Determines whether a path has a trailing separator (`/` or `\\`).
-     */
-    function hasTrailingDirectorySeparator(path) {
-        if (path.length === 0)
-            return false;
-        var ch = path.charCodeAt(path.length - 1);
-        return ch === 47 /* slash */ || ch === 92 /* backslash */;
-    }
-    ts.hasTrailingDirectorySeparator = hasTrailingDirectorySeparator;
-    function removeTrailingDirectorySeparator(path) {
-        if (hasTrailingDirectorySeparator(path)) {
-            return path.substr(0, path.length - 1);
-        }
-        return path;
-    }
-    ts.removeTrailingDirectorySeparator = removeTrailingDirectorySeparator;
-    function ensureTrailingDirectorySeparator(path) {
-        if (!hasTrailingDirectorySeparator(path)) {
-            return path + ts.directorySeparator;
-        }
-        return path;
-    }
-    ts.ensureTrailingDirectorySeparator = ensureTrailingDirectorySeparator;
-    function comparePathsWorker(a, b, componentComparer) {
-        if (a === b)
-            return 0 /* EqualTo */;
-        if (a === undefined)
-            return -1 /* LessThan */;
-        if (b === undefined)
-            return 1 /* GreaterThan */;
-        var aComponents = reducePathComponents(getPathComponents(a));
-        var bComponents = reducePathComponents(getPathComponents(b));
-        var sharedLength = Math.min(aComponents.length, bComponents.length);
-        for (var i = 0; i < sharedLength; i++) {
-            var stringComparer = i === 0 ? compareStringsCaseInsensitive : componentComparer;
-            var result = stringComparer(aComponents[i], bComponents[i]);
-            if (result !== 0 /* EqualTo */) {
-                return result;
-            }
-        }
-        return compareValues(aComponents.length, bComponents.length);
-    }
-    /**
-     * Performs a case-sensitive comparison of two paths.
-     */
-    function comparePathsCaseSensitive(a, b) {
-        return comparePathsWorker(a, b, compareStringsCaseSensitive);
-    }
-    ts.comparePathsCaseSensitive = comparePathsCaseSensitive;
-    /**
-     * Performs a case-insensitive comparison of two paths.
-     */
-    function comparePathsCaseInsensitive(a, b) {
-        return comparePathsWorker(a, b, compareStringsCaseInsensitive);
-    }
-    ts.comparePathsCaseInsensitive = comparePathsCaseInsensitive;
-    function comparePaths(a, b, currentDirectory, ignoreCase) {
-        if (typeof currentDirectory === "string") {
-            a = combinePaths(currentDirectory, a);
-            b = combinePaths(currentDirectory, b);
-        }
-        else if (typeof currentDirectory === "boolean") {
-            ignoreCase = currentDirectory;
-        }
-        return comparePathsWorker(a, b, getStringComparer(ignoreCase));
-    }
-    ts.comparePaths = comparePaths;
-    function containsPath(parent, child, currentDirectory, ignoreCase) {
-        if (typeof currentDirectory === "string") {
-            parent = combinePaths(currentDirectory, parent);
-            child = combinePaths(currentDirectory, child);
-        }
-        else if (typeof currentDirectory === "boolean") {
-            ignoreCase = currentDirectory;
-        }
-        if (parent === undefined || child === undefined)
-            return false;
-        if (parent === child)
-            return true;
-        var parentComponents = reducePathComponents(getPathComponents(parent));
-        var childComponents = reducePathComponents(getPathComponents(child));
-        if (childComponents.length < parentComponents.length) {
-            return false;
-        }
-        var componentEqualityComparer = ignoreCase ? equateStringsCaseInsensitive : equateStringsCaseSensitive;
-        for (var i = 0; i < parentComponents.length; i++) {
-            var equalityComparer = i === 0 ? equateStringsCaseInsensitive : componentEqualityComparer;
-            if (!equalityComparer(parentComponents[i], childComponents[i])) {
-                return false;
-            }
-        }
-        return true;
-    }
-    ts.containsPath = containsPath;
-    function startsWith(str, prefix) {
-        return str.lastIndexOf(prefix, 0) === 0;
-    }
-    ts.startsWith = startsWith;
-    function removePrefix(str, prefix) {
-        return startsWith(str, prefix) ? str.substr(prefix.length) : str;
-    }
-    ts.removePrefix = removePrefix;
-    function tryRemovePrefix(str, prefix) {
-        return startsWith(str, prefix) ? str.substring(prefix.length) : undefined;
-    }
-    ts.tryRemovePrefix = tryRemovePrefix;
-    function tryRemoveDirectoryPrefix(path, dirPath) {
-        var a = tryRemovePrefix(path, dirPath);
-        if (a === undefined)
-            return undefined;
-        switch (a.charCodeAt(0)) {
-            case 47 /* slash */:
-            case 92 /* backslash */:
-                return a.slice(1);
-            default:
-                return undefined;
-        }
-    }
-    ts.tryRemoveDirectoryPrefix = tryRemoveDirectoryPrefix;
-    function endsWith(str, suffix) {
-        var expectedPos = str.length - suffix.length;
-        return expectedPos >= 0 && str.indexOf(suffix, expectedPos) === expectedPos;
-    }
-    ts.endsWith = endsWith;
-    function removeSuffix(str, suffix) {
-        return endsWith(str, suffix) ? str.slice(0, str.length - suffix.length) : str;
-    }
-    ts.removeSuffix = removeSuffix;
-    function tryRemoveSuffix(str, suffix) {
-        return endsWith(str, suffix) ? str.slice(0, str.length - suffix.length) : undefined;
-    }
-    ts.tryRemoveSuffix = tryRemoveSuffix;
-    function stringContains(str, substring) {
-        return str.indexOf(substring) !== -1;
-    }
-    ts.stringContains = stringContains;
-    function hasExtension(fileName) {
-        return stringContains(getBaseFileName(fileName), ".");
-    }
-    ts.hasExtension = hasExtension;
-    function fileExtensionIs(path, extension) {
-        return path.length > extension.length && endsWith(path, extension);
-    }
-    ts.fileExtensionIs = fileExtensionIs;
-    function fileExtensionIsOneOf(path, extensions) {
-        for (var _i = 0, extensions_1 = extensions; _i < extensions_1.length; _i++) {
-            var extension = extensions_1[_i];
-            if (fileExtensionIs(path, extension)) {
-                return true;
-            }
-        }
-        return false;
-    }
-    ts.fileExtensionIsOneOf = fileExtensionIsOneOf;
-    // Reserved characters, forces escaping of any non-word (or digit), non-whitespace character.
-    // It may be inefficient (we could just match (/[-[\]{}()*+?.,\\^$|#\s]/g), but this is future
-    // proof.
-    var reservedCharacterPattern = /[^\w\s\/]/g;
-    var wildcardCharCodes = [42 /* asterisk */, 63 /* question */];
-    ts.commonPackageFolders = ["node_modules", "bower_components", "jspm_packages"];
-    var implicitExcludePathRegexPattern = "(?!(" + ts.commonPackageFolders.join("|") + ")(/|$))";
-    var filesMatcher = {
-        /**
-         * Matches any single directory segment unless it is the last segment and a .min.js file
-         * Breakdown:
-         *  [^./]                   # matches everything up to the first . character (excluding directory separators)
-         *  (\\.(?!min\\.js$))?     # matches . characters but not if they are part of the .min.js file extension
-         */
-        singleAsteriskRegexFragment: "([^./]|(\\.(?!min\\.js$))?)*",
-        /**
-         * Regex for the ** wildcard. Matches any number of subdirectories. When used for including
-         * files or directories, does not match subdirectories that start with a . character
-         */
-        doubleAsteriskRegexFragment: "(/" + implicitExcludePathRegexPattern + "[^/.][^/]*)*?",
-        replaceWildcardCharacter: function (match) { return replaceWildcardCharacter(match, filesMatcher.singleAsteriskRegexFragment); }
-    };
-    var directoriesMatcher = {
-        singleAsteriskRegexFragment: "[^/]*",
-        /**
-         * Regex for the ** wildcard. Matches any number of subdirectories. When used for including
-         * files or directories, does not match subdirectories that start with a . character
-         */
-        doubleAsteriskRegexFragment: "(/" + implicitExcludePathRegexPattern + "[^/.][^/]*)*?",
-        replaceWildcardCharacter: function (match) { return replaceWildcardCharacter(match, directoriesMatcher.singleAsteriskRegexFragment); }
-    };
-    var excludeMatcher = {
-        singleAsteriskRegexFragment: "[^/]*",
-        doubleAsteriskRegexFragment: "(/.+?)?",
-        replaceWildcardCharacter: function (match) { return replaceWildcardCharacter(match, excludeMatcher.singleAsteriskRegexFragment); }
-    };
-    var wildcardMatchers = {
-        files: filesMatcher,
-        directories: directoriesMatcher,
-        exclude: excludeMatcher
-    };
-    function getRegularExpressionForWildcard(specs, basePath, usage) {
-        var patterns = getRegularExpressionsForWildcards(specs, basePath, usage);
-        if (!patterns || !patterns.length) {
-            return undefined;
-        }
-        var pattern = patterns.map(function (pattern) { return "(" + pattern + ")"; }).join("|");
-        // If excluding, match "foo/bar/baz...", but if including, only allow "foo".
-        var terminator = usage === "exclude" ? "($|/)" : "$";
-        return "^(" + pattern + ")" + terminator;
-    }
-    ts.getRegularExpressionForWildcard = getRegularExpressionForWildcard;
-    function getRegularExpressionsForWildcards(specs, basePath, usage) {
-        if (specs === undefined || specs.length === 0) {
-            return undefined;
-        }
-        return flatMap(specs, function (spec) {
-            return spec && getSubPatternFromSpec(spec, basePath, usage, wildcardMatchers[usage]);
-        });
-    }
-    /**
-     * An "includes" path "foo" is implicitly a glob "foo/** /*" (without the space) if its last component has no extension,
-     * and does not contain any glob characters itself.
-     */
-    function isImplicitGlob(lastPathComponent) {
-        return !/[.*?]/.test(lastPathComponent);
-    }
-    ts.isImplicitGlob = isImplicitGlob;
-    function getSubPatternFromSpec(spec, basePath, usage, _a) {
-        var singleAsteriskRegexFragment = _a.singleAsteriskRegexFragment, doubleAsteriskRegexFragment = _a.doubleAsteriskRegexFragment, replaceWildcardCharacter = _a.replaceWildcardCharacter;
-        var subpattern = "";
-        var hasWrittenComponent = false;
-        var components = getNormalizedPathComponents(spec, basePath);
-        var lastComponent = last(components);
-        if (usage !== "exclude" && lastComponent === "**") {
-            return undefined;
-        }
-        // getNormalizedPathComponents includes the separator for the root component.
-        // We need to remove to create our regex correctly.
-        components[0] = removeTrailingDirectorySeparator(components[0]);
-        if (isImplicitGlob(lastComponent)) {
-            components.push("**", "*");
-        }
-        var optionalCount = 0;
-        for (var _i = 0, components_1 = components; _i < components_1.length; _i++) {
-            var component = components_1[_i];
-            if (component === "**") {
-                subpattern += doubleAsteriskRegexFragment;
-            }
-            else {
-                if (usage === "directories") {
-                    subpattern += "(";
-                    optionalCount++;
-                }
-                if (hasWrittenComponent) {
-                    subpattern += ts.directorySeparator;
-                }
-                if (usage !== "exclude") {
-                    var componentPattern = "";
-                    // The * and ? wildcards should not match directories or files that start with . if they
-                    // appear first in a component. Dotted directories and files can be included explicitly
-                    // like so: **/.*/.*
-                    if (component.charCodeAt(0) === 42 /* asterisk */) {
-                        componentPattern += "([^./]" + singleAsteriskRegexFragment + ")?";
-                        component = component.substr(1);
-                    }
-                    else if (component.charCodeAt(0) === 63 /* question */) {
-                        componentPattern += "[^./]";
-                        component = component.substr(1);
-                    }
-                    componentPattern += component.replace(reservedCharacterPattern, replaceWildcardCharacter);
-                    // Patterns should not include subfolders like node_modules unless they are
-                    // explicitly included as part of the path.
-                    //
-                    // As an optimization, if the component pattern is the same as the component,
-                    // then there definitely were no wildcard characters and we do not need to
-                    // add the exclusion pattern.
-                    if (componentPattern !== component) {
-                        subpattern += implicitExcludePathRegexPattern;
-                    }
-                    subpattern += componentPattern;
-                }
-                else {
-                    subpattern += component.replace(reservedCharacterPattern, replaceWildcardCharacter);
-                }
-            }
-            hasWrittenComponent = true;
-        }
-        while (optionalCount > 0) {
-            subpattern += ")?";
-            optionalCount--;
-        }
-        return subpattern;
-    }
-    function replaceWildcardCharacter(match, singleAsteriskRegexFragment) {
-        return match === "*" ? singleAsteriskRegexFragment : match === "?" ? "[^/]" : "\\" + match;
-    }
-    /** @param path directory of the tsconfig.json */
-    function getFileMatcherPatterns(path, excludes, includes, useCaseSensitiveFileNames, currentDirectory) {
-        path = normalizePath(path);
-        currentDirectory = normalizePath(currentDirectory);
-        var absolutePath = combinePaths(currentDirectory, path);
-        return {
-            includeFilePatterns: map(getRegularExpressionsForWildcards(includes, absolutePath, "files"), function (pattern) { return "^" + pattern + "$"; }),
-            includeFilePattern: getRegularExpressionForWildcard(includes, absolutePath, "files"),
-            includeDirectoryPattern: getRegularExpressionForWildcard(includes, absolutePath, "directories"),
-            excludePattern: getRegularExpressionForWildcard(excludes, absolutePath, "exclude"),
-            basePaths: getBasePaths(path, includes, useCaseSensitiveFileNames)
-        };
-    }
-    ts.getFileMatcherPatterns = getFileMatcherPatterns;
-    function getRegexFromPattern(pattern, useCaseSensitiveFileNames) {
-        return new RegExp(pattern, useCaseSensitiveFileNames ? "" : "i");
-    }
-    ts.getRegexFromPattern = getRegexFromPattern;
-    /** @param path directory of the tsconfig.json */
-    function matchFiles(path, extensions, excludes, includes, useCaseSensitiveFileNames, currentDirectory, depth, getFileSystemEntries) {
-        path = normalizePath(path);
-        currentDirectory = normalizePath(currentDirectory);
-        var patterns = getFileMatcherPatterns(path, excludes, includes, useCaseSensitiveFileNames, currentDirectory);
-        var includeFileRegexes = patterns.includeFilePatterns && patterns.includeFilePatterns.map(function (pattern) { return getRegexFromPattern(pattern, useCaseSensitiveFileNames); });
-        var includeDirectoryRegex = patterns.includeDirectoryPattern && getRegexFromPattern(patterns.includeDirectoryPattern, useCaseSensitiveFileNames);
-        var excludeRegex = patterns.excludePattern && getRegexFromPattern(patterns.excludePattern, useCaseSensitiveFileNames);
-        // Associate an array of results with each include regex. This keeps results in order of the "include" order.
-        // If there are no "includes", then just put everything in results[0].
-        var results = includeFileRegexes ? includeFileRegexes.map(function () { return []; }) : [[]];
-        for (var _i = 0, _a = patterns.basePaths; _i < _a.length; _i++) {
-            var basePath = _a[_i];
-            visitDirectory(basePath, combinePaths(currentDirectory, basePath), depth);
-        }
-        return flatten(results);
-        function visitDirectory(path, absolutePath, depth) {
-            var _a = getFileSystemEntries(path), files = _a.files, directories = _a.directories;
-            var _loop_1 = function (current) {
-                var name = combinePaths(path, current);
-                var absoluteName = combinePaths(absolutePath, current);
-                if (extensions && !fileExtensionIsOneOf(name, extensions))
-                    return "continue";
-                if (excludeRegex && excludeRegex.test(absoluteName))
-                    return "continue";
-                if (!includeFileRegexes) {
-                    results[0].push(name);
-                }
-                else {
-                    var includeIndex = findIndex(includeFileRegexes, function (re) { return re.test(absoluteName); });
-                    if (includeIndex !== -1) {
-                        results[includeIndex].push(name);
-                    }
-                }
-            };
-            for (var _i = 0, _b = sort(files, compareStringsCaseSensitive); _i < _b.length; _i++) {
-                var current = _b[_i];
-                _loop_1(current);
-            }
-            if (depth !== undefined) {
-                depth--;
-                if (depth === 0) {
-                    return;
-                }
-            }
-            for (var _c = 0, _d = sort(directories, compareStringsCaseSensitive); _c < _d.length; _c++) {
-                var current = _d[_c];
-                var name = combinePaths(path, current);
-                var absoluteName = combinePaths(absolutePath, current);
-                if ((!includeDirectoryRegex || includeDirectoryRegex.test(absoluteName)) &&
-                    (!excludeRegex || !excludeRegex.test(absoluteName))) {
-                    visitDirectory(name, absoluteName, depth);
-                }
-            }
-        }
-    }
-    ts.matchFiles = matchFiles;
-    /**
-     * Computes the unique non-wildcard base paths amongst the provided include patterns.
-     */
-    function getBasePaths(path, includes, useCaseSensitiveFileNames) {
-        // Storage for our results in the form of literal paths (e.g. the paths as written by the user).
-        var basePaths = [path];
-        if (includes) {
-            // Storage for literal base paths amongst the include patterns.
-            var includeBasePaths = [];
-            for (var _i = 0, includes_1 = includes; _i < includes_1.length; _i++) {
-                var include = includes_1[_i];
-                // We also need to check the relative paths by converting them to absolute and normalizing
-                // in case they escape the base path (e.g "..\somedirectory")
-                var absolute = isRootedDiskPath(include) ? include : normalizePath(combinePaths(path, include));
-                // Append the literal and canonical candidate base paths.
-                includeBasePaths.push(getIncludeBasePath(absolute));
-            }
-            // Sort the offsets array using either the literal or canonical path representations.
-            includeBasePaths.sort(getStringComparer(!useCaseSensitiveFileNames));
-            var _loop_2 = function (includeBasePath) {
-                if (every(basePaths, function (basePath) { return !containsPath(basePath, includeBasePath, path, !useCaseSensitiveFileNames); })) {
-                    basePaths.push(includeBasePath);
-                }
-            };
-            // Iterate over each include base path and include unique base paths that are not a
-            // subpath of an existing base path
-            for (var _a = 0, includeBasePaths_1 = includeBasePaths; _a < includeBasePaths_1.length; _a++) {
-                var includeBasePath = includeBasePaths_1[_a];
-                _loop_2(includeBasePath);
-            }
-        }
-        return basePaths;
-    }
-    function getIncludeBasePath(absolute) {
-        var wildcardOffset = indexOfAnyCharCode(absolute, wildcardCharCodes);
-        if (wildcardOffset < 0) {
-            // No "*" or "?" in the path
-            return !hasExtension(absolute)
-                ? absolute
-                : removeTrailingDirectorySeparator(getDirectoryPath(absolute));
-        }
-        return absolute.substring(0, absolute.lastIndexOf(ts.directorySeparator, wildcardOffset));
-    }
-    function ensureScriptKind(fileName, scriptKind) {
-        // Using scriptKind as a condition handles both:
-        // - 'scriptKind' is unspecified and thus it is `undefined`
-        // - 'scriptKind' is set and it is `Unknown` (0)
-        // If the 'scriptKind' is 'undefined' or 'Unknown' then we attempt
-        // to get the ScriptKind from the file name. If it cannot be resolved
-        // from the file name then the default 'TS' script kind is returned.
-        return scriptKind || getScriptKindFromFileName(fileName) || 3 /* TS */;
-    }
-    ts.ensureScriptKind = ensureScriptKind;
-    function getScriptKindFromFileName(fileName) {
-        var ext = fileName.substr(fileName.lastIndexOf("."));
-        switch (ext.toLowerCase()) {
-            case ".js" /* Js */:
-                return 1 /* JS */;
-            case ".jsx" /* Jsx */:
-                return 2 /* JSX */;
-            case ".ts" /* Ts */:
-                return 3 /* TS */;
-            case ".tsx" /* Tsx */:
-                return 4 /* TSX */;
-            case ".json" /* Json */:
-                return 6 /* JSON */;
-            default:
-                return 0 /* Unknown */;
-        }
-    }
-    ts.getScriptKindFromFileName = getScriptKindFromFileName;
-    /**
-     *  List of supported extensions in order of file resolution precedence.
-     */
-    ts.supportedTypeScriptExtensions = [".ts" /* Ts */, ".tsx" /* Tsx */, ".d.ts" /* Dts */];
-    /** Must have ".d.ts" first because if ".ts" goes first, that will be detected as the extension instead of ".d.ts". */
-    ts.supportedTypescriptExtensionsForExtractExtension = [".d.ts" /* Dts */, ".ts" /* Ts */, ".tsx" /* Tsx */];
-    ts.supportedJavascriptExtensions = [".js" /* Js */, ".jsx" /* Jsx */];
-    var allSupportedExtensions = ts.supportedTypeScriptExtensions.concat(ts.supportedJavascriptExtensions);
-    function getSupportedExtensions(options, extraFileExtensions) {
-        var needJsExtensions = options && options.allowJs;
-        if (!extraFileExtensions || extraFileExtensions.length === 0) {
-            return needJsExtensions ? allSupportedExtensions : ts.supportedTypeScriptExtensions;
-        }
-        var extensions = (needJsExtensions ? allSupportedExtensions : ts.supportedTypeScriptExtensions).concat(mapDefined(extraFileExtensions, function (x) { return x.scriptKind === 7 /* Deferred */ || needJsExtensions && isJavaScriptLike(x.scriptKind) ? x.extension : undefined; }));
-        return deduplicate(extensions, equateStringsCaseSensitive, compareStringsCaseSensitive);
-    }
-    ts.getSupportedExtensions = getSupportedExtensions;
-    function isJavaScriptLike(scriptKind) {
-        return scriptKind === 1 /* JS */ || scriptKind === 2 /* JSX */;
-    }
-    function hasJavaScriptFileExtension(fileName) {
-        return some(ts.supportedJavascriptExtensions, function (extension) { return fileExtensionIs(fileName, extension); });
-    }
-    ts.hasJavaScriptFileExtension = hasJavaScriptFileExtension;
-    function hasTypeScriptFileExtension(fileName) {
-        return some(ts.supportedTypeScriptExtensions, function (extension) { return fileExtensionIs(fileName, extension); });
-    }
-    ts.hasTypeScriptFileExtension = hasTypeScriptFileExtension;
-    function isSupportedSourceFileName(fileName, compilerOptions, extraFileExtensions) {
-        if (!fileName) {
-            return false;
-        }
-        for (var _i = 0, _a = getSupportedExtensions(compilerOptions, extraFileExtensions); _i < _a.length; _i++) {
-            var extension = _a[_i];
-            if (fileExtensionIs(fileName, extension)) {
-                return true;
-            }
-        }
-        return false;
-    }
-    ts.isSupportedSourceFileName = isSupportedSourceFileName;
-    /**
-     * Extension boundaries by priority. Lower numbers indicate higher priorities, and are
-     * aligned to the offset of the highest priority extension in the
-     * allSupportedExtensions array.
-     */
-    var ExtensionPriority;
-    (function (ExtensionPriority) {
-        ExtensionPriority[ExtensionPriority["TypeScriptFiles"] = 0] = "TypeScriptFiles";
-        ExtensionPriority[ExtensionPriority["DeclarationAndJavaScriptFiles"] = 2] = "DeclarationAndJavaScriptFiles";
-        ExtensionPriority[ExtensionPriority["Highest"] = 0] = "Highest";
-        ExtensionPriority[ExtensionPriority["Lowest"] = 2] = "Lowest";
-    })(ExtensionPriority = ts.ExtensionPriority || (ts.ExtensionPriority = {}));
-    function getExtensionPriority(path, supportedExtensions) {
-        for (var i = supportedExtensions.length - 1; i >= 0; i--) {
-            if (fileExtensionIs(path, supportedExtensions[i])) {
-                return adjustExtensionPriority(i, supportedExtensions);
-            }
-        }
-        // If its not in the list of supported extensions, this is likely a
-        // TypeScript file with a non-ts extension
-        return 0 /* Highest */;
-    }
-    ts.getExtensionPriority = getExtensionPriority;
-    /**
-     * Adjusts an extension priority to be the highest priority within the same range.
-     */
-    function adjustExtensionPriority(extensionPriority, supportedExtensions) {
-        if (extensionPriority < 2 /* DeclarationAndJavaScriptFiles */) {
-            return 0 /* TypeScriptFiles */;
-        }
-        else if (extensionPriority < supportedExtensions.length) {
-            return 2 /* DeclarationAndJavaScriptFiles */;
-        }
-        else {
-            return supportedExtensions.length;
-        }
-    }
-    ts.adjustExtensionPriority = adjustExtensionPriority;
-    /**
-     * Gets the next lowest extension priority for a given priority.
-     */
-    function getNextLowestExtensionPriority(extensionPriority, supportedExtensions) {
-        if (extensionPriority < 2 /* DeclarationAndJavaScriptFiles */) {
-            return 2 /* DeclarationAndJavaScriptFiles */;
-        }
-        else {
-            return supportedExtensions.length;
-        }
-    }
-    ts.getNextLowestExtensionPriority = getNextLowestExtensionPriority;
-    var extensionsToRemove = [".d.ts" /* Dts */, ".ts" /* Ts */, ".js" /* Js */, ".tsx" /* Tsx */, ".jsx" /* Jsx */, ".json" /* Json */];
-    function removeFileExtension(path) {
-        for (var _i = 0, extensionsToRemove_1 = extensionsToRemove; _i < extensionsToRemove_1.length; _i++) {
-            var ext = extensionsToRemove_1[_i];
-            var extensionless = tryRemoveExtension(path, ext);
-            if (extensionless !== undefined) {
-                return extensionless;
-            }
-        }
-        return path;
-    }
-    ts.removeFileExtension = removeFileExtension;
-    function tryRemoveExtension(path, extension) {
-        return fileExtensionIs(path, extension) ? removeExtension(path, extension) : undefined;
-    }
-    ts.tryRemoveExtension = tryRemoveExtension;
-    function removeExtension(path, extension) {
-        return path.substring(0, path.length - extension.length);
-    }
-    ts.removeExtension = removeExtension;
-    function changeExtension(path, newExtension) {
-        return changeAnyExtension(path, newExtension, extensionsToRemove, /*ignoreCase*/ false);
-    }
-    ts.changeExtension = changeExtension;
-    function changeAnyExtension(path, ext, extensions, ignoreCase) {
-        var pathext = extensions !== undefined && ignoreCase !== undefined ? getAnyExtensionFromPath(path, extensions, ignoreCase) : getAnyExtensionFromPath(path);
-        return pathext ? path.slice(0, path.length - pathext.length) + (startsWith(ext, ".") ? ext : "." + ext) : path;
-    }
-    ts.changeAnyExtension = changeAnyExtension;
-    /**
-     * Takes a string like "jquery-min.4.2.3" and returns "jquery"
-     */
-    function removeMinAndVersionNumbers(fileName) {
-        // Match a "." or "-" followed by a version number or 'min' at the end of the name
-        var trailingMinOrVersion = /[.-]((min)|(\d+(\.\d+)*))$/;
-        // The "min" or version may both be present, in either order, so try applying the above twice.
-        return fileName.replace(trailingMinOrVersion, "").replace(trailingMinOrVersion, "");
-    }
-    ts.removeMinAndVersionNumbers = removeMinAndVersionNumbers;
-    function Symbol(flags, name) {
-        this.flags = flags;
-        this.escapedName = name;
-        this.declarations = undefined;
-        this.valueDeclaration = undefined;
-        this.id = undefined;
-        this.mergeId = undefined;
-        this.parent = undefined;
-    }
-    function Type(checker, flags) {
-        this.flags = flags;
-        if (Debug.isDebugging) {
-            this.checker = checker;
-        }
-    }
-    function Signature() { } // tslint:disable-line no-empty
-    function Node(kind, pos, end) {
-        this.pos = pos;
-        this.end = end;
-        this.kind = kind;
-        this.id = 0;
-        this.flags = 0 /* None */;
-        this.modifierFlagsCache = 0 /* None */;
-        this.transformFlags = 0 /* None */;
-        this.parent = undefined;
-        this.original = undefined;
-    }
-    function SourceMapSource(fileName, text, skipTrivia) {
-        this.fileName = fileName;
-        this.text = text;
-        this.skipTrivia = skipTrivia || (function (pos) { return pos; });
-    }
-    ts.objectAllocator = {
-        getNodeConstructor: function () { return Node; },
-        getTokenConstructor: function () { return Node; },
-        getIdentifierConstructor: function () { return Node; },
-        getSourceFileConstructor: function () { return Node; },
-        getSymbolConstructor: function () { return Symbol; },
-        getTypeConstructor: function () { return Type; },
-        getSignatureConstructor: function () { return Signature; },
-        getSourceMapSourceConstructor: function () { return SourceMapSource; },
-    };
-    var AssertionLevel;
-    (function (AssertionLevel) {
-        AssertionLevel[AssertionLevel["None"] = 0] = "None";
-        AssertionLevel[AssertionLevel["Normal"] = 1] = "Normal";
-        AssertionLevel[AssertionLevel["Aggressive"] = 2] = "Aggressive";
-        AssertionLevel[AssertionLevel["VeryAggressive"] = 3] = "VeryAggressive";
-    })(AssertionLevel = ts.AssertionLevel || (ts.AssertionLevel = {}));
-    var Debug;
-    (function (Debug) {
-        Debug.currentAssertionLevel = 0 /* None */;
-        Debug.isDebugging = false;
-        function shouldAssert(level) {
-            return Debug.currentAssertionLevel >= level;
-        }
-        Debug.shouldAssert = shouldAssert;
-        function assert(expression, message, verboseDebugInfo, stackCrawlMark) {
-            if (!expression) {
-                if (verboseDebugInfo) {
-                    message += "\r\nVerbose Debug Information: " + (typeof verboseDebugInfo === "string" ? verboseDebugInfo : verboseDebugInfo());
-                }
-                fail(message ? "False expression: " + message : "False expression.", stackCrawlMark || assert);
-            }
-        }
-        Debug.assert = assert;
-        function assertEqual(a, b, msg, msg2) {
-            if (a !== b) {
-                var message = msg ? msg2 ? msg + " " + msg2 : msg : "";
-                fail("Expected " + a + " === " + b + ". " + message);
-            }
-        }
-        Debug.assertEqual = assertEqual;
-        function assertLessThan(a, b, msg) {
-            if (a >= b) {
-                fail("Expected " + a + " < " + b + ". " + (msg || ""));
-            }
-        }
-        Debug.assertLessThan = assertLessThan;
-        function assertLessThanOrEqual(a, b) {
-            if (a > b) {
-                fail("Expected " + a + " <= " + b);
-            }
-        }
-        Debug.assertLessThanOrEqual = assertLessThanOrEqual;
-        function assertGreaterThanOrEqual(a, b) {
-            if (a < b) {
-                fail("Expected " + a + " >= " + b);
-            }
-        }
-        Debug.assertGreaterThanOrEqual = assertGreaterThanOrEqual;
-        function fail(message, stackCrawlMark) {
-            debugger;
-            var e = new Error(message ? "Debug Failure. " + message : "Debug Failure.");
-            if (Error.captureStackTrace) {
-                Error.captureStackTrace(e, stackCrawlMark || fail);
-            }
-            throw e;
-        }
-        Debug.fail = fail;
-        function assertDefined(value, message) {
-            if (value === undefined || value === null)
-                return fail(message);
-            return value;
-        }
-        Debug.assertDefined = assertDefined;
-        function assertEachDefined(value, message) {
-            for (var _i = 0, value_1 = value; _i < value_1.length; _i++) {
-                var v = value_1[_i];
-                assertDefined(v, message);
-            }
-            return value;
-        }
-        Debug.assertEachDefined = assertEachDefined;
-        function assertNever(member, message, stackCrawlMark) {
-            return fail(message || "Illegal value: " + member, stackCrawlMark || assertNever);
-        }
-        Debug.assertNever = assertNever;
-        function getFunctionName(func) {
-            if (typeof func !== "function") {
-                return "";
-            }
-            else if (func.hasOwnProperty("name")) {
-                return func.name;
-            }
-            else {
-                var text = Function.prototype.toString.call(func);
-                var match = /^function\s+([\w\$]+)\s*\(/.exec(text);
-                return match ? match[1] : "";
-            }
-        }
-        Debug.getFunctionName = getFunctionName;
-        function showSymbol(symbol) {
-            var symbolFlags = ts.SymbolFlags;
-            return "{ flags: " + (symbolFlags ? showFlags(symbol.flags, symbolFlags) : symbol.flags) + "; declarations: " + map(symbol.declarations, showSyntaxKind) + " }";
-        }
-        Debug.showSymbol = showSymbol;
-        function showFlags(flags, flagsEnum) {
-            var out = [];
-            for (var pow = 0; pow <= 30; pow++) {
-                var n = 1 << pow;
-                if (flags & n) {
-                    out.push(flagsEnum[n]);
-                }
-            }
-            return out.join("|");
-        }
-        function showSyntaxKind(node) {
-            var syntaxKind = ts.SyntaxKind;
-            return syntaxKind ? syntaxKind[node.kind] : node.kind.toString();
-        }
-        Debug.showSyntaxKind = showSyntaxKind;
-    })(Debug = ts.Debug || (ts.Debug = {}));
-    /** Remove an item from an array, moving everything to its right one space left. */
-    function orderedRemoveItem(array, item) {
-        for (var i = 0; i < array.length; i++) {
-            if (array[i] === item) {
-                orderedRemoveItemAt(array, i);
-                return true;
-            }
-        }
-        return false;
-    }
-    ts.orderedRemoveItem = orderedRemoveItem;
-    /** Remove an item by index from an array, moving everything to its right one space left. */
-    function orderedRemoveItemAt(array, index) {
-        // This seems to be faster than either `array.splice(i, 1)` or `array.copyWithin(i, i+ 1)`.
-        for (var i = index; i < array.length - 1; i++) {
-            array[i] = array[i + 1];
-        }
-        array.pop();
-    }
-    ts.orderedRemoveItemAt = orderedRemoveItemAt;
-    function unorderedRemoveItemAt(array, index) {
-        // Fill in the "hole" left at `index`.
-        array[index] = array[array.length - 1];
-        array.pop();
-    }
-    ts.unorderedRemoveItemAt = unorderedRemoveItemAt;
-    /** Remove the *first* occurrence of `item` from the array. */
-    function unorderedRemoveItem(array, item) {
-        return unorderedRemoveFirstItemWhere(array, function (element) { return element === item; });
-    }
-    ts.unorderedRemoveItem = unorderedRemoveItem;
-    /** Remove the *first* element satisfying `predicate`. */
-    function unorderedRemoveFirstItemWhere(array, predicate) {
-        for (var i = 0; i < array.length; i++) {
-            if (predicate(array[i])) {
-                unorderedRemoveItemAt(array, i);
-                return true;
-            }
-        }
-        return false;
-    }
-    function createGetCanonicalFileName(useCaseSensitiveFileNames) {
-        return useCaseSensitiveFileNames ? identity : toLowerCase;
-    }
-    ts.createGetCanonicalFileName = createGetCanonicalFileName;
-    /**
-     * patternStrings contains both pattern strings (containing "*") and regular strings.
-     * Return an exact match if possible, or a pattern match, or undefined.
-     * (These are verified by verifyCompilerOptions to have 0 or 1 "*" characters.)
-     */
-    function matchPatternOrExact(patternStrings, candidate) {
-        var patterns = [];
-        for (var _i = 0, patternStrings_1 = patternStrings; _i < patternStrings_1.length; _i++) {
-            var patternString = patternStrings_1[_i];
-            var pattern = tryParsePattern(patternString);
-            if (pattern) {
-                patterns.push(pattern);
-            }
-            else if (patternString === candidate) {
-                // pattern was matched as is - no need to search further
-                return patternString;
-            }
-        }
-        return findBestPatternMatch(patterns, function (_) { return _; }, candidate);
-    }
-    ts.matchPatternOrExact = matchPatternOrExact;
-    function patternText(_a) {
-        var prefix = _a.prefix, suffix = _a.suffix;
-        return prefix + "*" + suffix;
-    }
-    ts.patternText = patternText;
-    /**
-     * Given that candidate matches pattern, returns the text matching the '*'.
-     * E.g.: matchedText(tryParsePattern("foo*baz"), "foobarbaz") === "bar"
-     */
-    function matchedText(pattern, candidate) {
-        Debug.assert(isPatternMatch(pattern, candidate));
-        return candidate.substring(pattern.prefix.length, candidate.length - pattern.suffix.length);
-    }
-    ts.matchedText = matchedText;
-    /** Return the object corresponding to the best pattern to match `candidate`. */
-    function findBestPatternMatch(values, getPattern, candidate) {
-        var matchedValue;
-        // use length of prefix as betterness criteria
-        var longestMatchPrefixLength = -1;
-        for (var _i = 0, values_2 = values; _i < values_2.length; _i++) {
-            var v = values_2[_i];
-            var pattern = getPattern(v);
-            if (isPatternMatch(pattern, candidate) && pattern.prefix.length > longestMatchPrefixLength) {
-                longestMatchPrefixLength = pattern.prefix.length;
-                matchedValue = v;
-            }
-        }
-        return matchedValue;
-    }
-    ts.findBestPatternMatch = findBestPatternMatch;
-    function isPatternMatch(_a, candidate) {
-        var prefix = _a.prefix, suffix = _a.suffix;
-        return candidate.length >= prefix.length + suffix.length &&
-            startsWith(candidate, prefix) &&
-            endsWith(candidate, suffix);
-    }
-    function tryParsePattern(pattern) {
-        // This should be verified outside of here and a proper error thrown.
-        Debug.assert(hasZeroOrOneAsteriskCharacter(pattern));
-        var indexOfStar = pattern.indexOf("*");
-        return indexOfStar === -1 ? undefined : {
-            prefix: pattern.substr(0, indexOfStar),
-            suffix: pattern.substr(indexOfStar + 1)
-        };
-    }
-    ts.tryParsePattern = tryParsePattern;
-    function positionIsSynthesized(pos) {
-        // This is a fast way of testing the following conditions:
-        //  pos === undefined || pos === null || isNaN(pos) || pos < 0;
-        return !(pos >= 0);
-    }
-    ts.positionIsSynthesized = positionIsSynthesized;
-    /** True if an extension is one of the supported TypeScript extensions. */
-    function extensionIsTypeScript(ext) {
-        return ext === ".ts" /* Ts */ || ext === ".tsx" /* Tsx */ || ext === ".d.ts" /* Dts */;
-    }
-    ts.extensionIsTypeScript = extensionIsTypeScript;
-    function resolutionExtensionIsTypeScriptOrJson(ext) {
-        return extensionIsTypeScript(ext) || ext === ".json" /* Json */;
-    }
-    ts.resolutionExtensionIsTypeScriptOrJson = resolutionExtensionIsTypeScriptOrJson;
-    /**
-     * Gets the extension from a path.
-     * Path must have a valid extension.
-     */
-    function extensionFromPath(path) {
-        var ext = tryGetExtensionFromPath(path);
-        return ext !== undefined ? ext : Debug.fail("File " + path + " has unknown extension.");
-    }
-    ts.extensionFromPath = extensionFromPath;
-    function isAnySupportedFileExtension(path) {
-        return tryGetExtensionFromPath(path) !== undefined;
-    }
-    ts.isAnySupportedFileExtension = isAnySupportedFileExtension;
-    function tryGetExtensionFromPath(path) {
-        return find(ts.supportedTypescriptExtensionsForExtractExtension, function (e) { return fileExtensionIs(path, e); }) || find(ts.supportedJavascriptExtensions, function (e) { return fileExtensionIs(path, e); });
-    }
-    ts.tryGetExtensionFromPath = tryGetExtensionFromPath;
-    function getAnyExtensionFromPathWorker(path, extensions, stringEqualityComparer) {
-        if (typeof extensions === "string")
-            extensions = [extensions];
-        for (var _i = 0, extensions_2 = extensions; _i < extensions_2.length; _i++) {
-            var extension = extensions_2[_i];
-            if (!startsWith(extension, "."))
-                extension = "." + extension;
-            if (path.length >= extension.length && path.charAt(path.length - extension.length) === ".") {
-                var pathExtension = path.slice(path.length - extension.length);
-                if (stringEqualityComparer(pathExtension, extension)) {
-                    return pathExtension;
-                }
-            }
-        }
-        return "";
-    }
-    function getAnyExtensionFromPath(path, extensions, ignoreCase) {
-        // Retrieves any string from the final "." onwards from a base file name.
-        // Unlike extensionFromPath, which throws an exception on unrecognized extensions.
-        if (extensions) {
-            return getAnyExtensionFromPathWorker(path, extensions, ignoreCase ? equateStringsCaseInsensitive : equateStringsCaseSensitive);
-        }
-        var baseFileName = getBaseFileName(path);
-        var extensionIndex = baseFileName.lastIndexOf(".");
-        if (extensionIndex >= 0) {
-            return baseFileName.substring(extensionIndex);
-        }
-        return "";
-    }
-    ts.getAnyExtensionFromPath = getAnyExtensionFromPath;
-    function isCheckJsEnabledForFile(sourceFile, compilerOptions) {
-        return sourceFile.checkJsDirective ? sourceFile.checkJsDirective.enabled : compilerOptions.checkJs;
-    }
-    ts.isCheckJsEnabledForFile = isCheckJsEnabledForFile;
-    function and(f, g) {
-        return function (arg) { return f(arg) && g(arg); };
-    }
-    ts.and = and;
-    function or(f, g) {
-        return function (arg) { return f(arg) || g(arg); };
-    }
-    ts.or = or;
-    function assertTypeIsNever(_) { } // tslint:disable-line no-empty
-    ts.assertTypeIsNever = assertTypeIsNever;
-    ts.emptyFileSystemEntries = {
-        files: ts.emptyArray,
-        directories: ts.emptyArray
-    };
-    function singleElementArray(t) {
-        return t === undefined ? undefined : [t];
-    }
-    ts.singleElementArray = singleElementArray;
-    function enumerateInsertsAndDeletes(newItems, oldItems, comparer, inserted, deleted, unchanged) {
-        unchanged = unchanged || noop;
-        var newIndex = 0;
-        var oldIndex = 0;
-        var newLen = newItems.length;
-        var oldLen = oldItems.length;
-        while (newIndex < newLen && oldIndex < oldLen) {
-            var newItem = newItems[newIndex];
-            var oldItem = oldItems[oldIndex];
-            var compareResult = comparer(newItem, oldItem);
-            if (compareResult === -1 /* LessThan */) {
-                inserted(newItem);
-                newIndex++;
-            }
-            else if (compareResult === 1 /* GreaterThan */) {
-                deleted(oldItem);
-                oldIndex++;
-            }
-            else {
-                unchanged(oldItem, newItem);
-                newIndex++;
-                oldIndex++;
-            }
-        }
-        while (newIndex < newLen) {
-            inserted(newItems[newIndex++]);
-        }
-        while (oldIndex < oldLen) {
-            deleted(oldItems[oldIndex++]);
-        }
-    }
-    ts.enumerateInsertsAndDeletes = enumerateInsertsAndDeletes;
-})(ts || (ts = {}));
 var ts;
 (function (ts) {
     /**
@@ -5166,6 +3908,8 @@ var ts;
                 },
                 readDirectory: readDirectory,
                 getModifiedTime: getModifiedTime,
+                setModifiedTime: setModifiedTime,
+                deleteFile: deleteFile,
                 createHash: _crypto ? createMD5HashUsingNativeCrypto : generateDjb2Hash,
                 createSHA256Hash: _crypto ? createSHA256Hash : undefined,
                 getMemoryUsage: function () {
@@ -5595,6 +4339,22 @@ var ts;
                     return undefined;
                 }
             }
+            function setModifiedTime(path, time) {
+                try {
+                    _fs.utimesSync(path, time, time);
+                }
+                catch (e) {
+                    return;
+                }
+            }
+            function deleteFile(path) {
+                try {
+                    return _fs.unlinkSync(path);
+                }
+                catch (e) {
+                    return;
+                }
+            }
             /**
              * djb2 hashing algorithm
              * http://www.cse.yorku.ca/~oz/hash.html
@@ -5691,7 +4451,7 @@ var ts;
     }
 })(ts || (ts = {}));
 // <auto-generated />
-// generated from './diagnosticInformationMap.generated.ts' by '../../scripts/processDiagnosticMessages.js'
+// generated from './diagnosticInformationMap.generated.ts' by 'src\parser'
 /* @internal */
 var ts;
 (function (ts) {
@@ -6292,6 +5052,8 @@ var ts;
         Cannot_invoke_an_object_which_is_possibly_null_or_undefined: diag(2723, ts.DiagnosticCategory.Error, "Cannot_invoke_an_object_which_is_possibly_null_or_undefined_2723", "Cannot invoke an object which is possibly 'null' or 'undefined'."),
         Module_0_has_no_exported_member_1_Did_you_mean_2: diag(2724, ts.DiagnosticCategory.Error, "Module_0_has_no_exported_member_1_Did_you_mean_2_2724", "Module '{0}' has no exported member '{1}'. Did you mean '{2}'?"),
         Class_name_cannot_be_Object_when_targeting_ES5_with_module_0: diag(2725, ts.DiagnosticCategory.Error, "Class_name_cannot_be_Object_when_targeting_ES5_with_module_0_2725", "Class name cannot be 'Object' when targeting ES5 with module {0}."),
+        Cannot_find_lib_definition_for_0: diag(2726, ts.DiagnosticCategory.Error, "Cannot_find_lib_definition_for_0_2726", "Cannot find lib definition for '{0}'."),
+        Cannot_find_lib_definition_for_0_Did_you_mean_1: diag(2727, ts.DiagnosticCategory.Error, "Cannot_find_lib_definition_for_0_Did_you_mean_1_2727", "Cannot find lib definition for '{0}'. Did you mean '{1}'?"),
         Import_declaration_0_is_using_private_name_1: diag(4000, ts.DiagnosticCategory.Error, "Import_declaration_0_is_using_private_name_1_4000", "Import declaration '{0}' is using private name '{1}'."),
         Type_parameter_0_of_exported_class_has_or_is_using_private_name_1: diag(4002, ts.DiagnosticCategory.Error, "Type_parameter_0_of_exported_class_has_or_is_using_private_name_1_4002", "Type parameter '{0}' of exported class has or is using private name '{1}'."),
         Type_parameter_0_of_exported_interface_has_or_is_using_private_name_1: diag(4004, ts.DiagnosticCategory.Error, "Type_parameter_0_of_exported_interface_has_or_is_using_private_name_1_4004", "Type parameter '{0}' of exported interface has or is using private name '{1}'."),
@@ -6600,6 +5362,28 @@ var ts;
         File_0_is_not_in_project_file_list_Projects_must_list_all_files_or_use_an_include_pattern: diag(6307, ts.DiagnosticCategory.Error, "File_0_is_not_in_project_file_list_Projects_must_list_all_files_or_use_an_include_pattern_6307", "File '{0}' is not in project file list. Projects must list all files or use an 'include' pattern."),
         Cannot_prepend_project_0_because_it_does_not_have_outFile_set: diag(6308, ts.DiagnosticCategory.Error, "Cannot_prepend_project_0_because_it_does_not_have_outFile_set_6308", "Cannot prepend project '{0}' because it does not have 'outFile' set"),
         Output_file_0_from_project_1_does_not_exist: diag(6309, ts.DiagnosticCategory.Error, "Output_file_0_from_project_1_does_not_exist_6309", "Output file '{0}' from project '{1}' does not exist"),
+        Project_0_is_out_of_date_because_oldest_output_1_is_older_than_newest_input_2: diag(6350, ts.DiagnosticCategory.Message, "Project_0_is_out_of_date_because_oldest_output_1_is_older_than_newest_input_2_6350", "Project '{0}' is out of date because oldest output '{1}' is older than newest input '{2}'"),
+        Project_0_is_up_to_date_because_newest_input_1_is_older_than_oldest_output_2: diag(6351, ts.DiagnosticCategory.Message, "Project_0_is_up_to_date_because_newest_input_1_is_older_than_oldest_output_2_6351", "Project '{0}' is up to date because newest input '{1}' is older than oldest output '{2}'"),
+        Project_0_is_out_of_date_because_output_file_1_does_not_exist: diag(6352, ts.DiagnosticCategory.Message, "Project_0_is_out_of_date_because_output_file_1_does_not_exist_6352", "Project '{0}' is out of date because output file '{1}' does not exist"),
+        Project_0_is_out_of_date_because_its_dependency_1_is_out_of_date: diag(6353, ts.DiagnosticCategory.Message, "Project_0_is_out_of_date_because_its_dependency_1_is_out_of_date_6353", "Project '{0}' is out of date because its dependency '{1}' is out of date"),
+        Project_0_is_up_to_date_with_d_ts_files_from_its_dependencies: diag(6354, ts.DiagnosticCategory.Message, "Project_0_is_up_to_date_with_d_ts_files_from_its_dependencies_6354", "Project '{0}' is up to date with .d.ts files from its dependencies"),
+        Projects_in_this_build_Colon_0: diag(6355, ts.DiagnosticCategory.Message, "Projects_in_this_build_Colon_0_6355", "Projects in this build: {0}"),
+        A_non_dry_build_would_delete_the_following_files_Colon_0: diag(6356, ts.DiagnosticCategory.Message, "A_non_dry_build_would_delete_the_following_files_Colon_0_6356", "A non-dry build would delete the following files: {0}"),
+        A_non_dry_build_would_build_project_0: diag(6357, ts.DiagnosticCategory.Message, "A_non_dry_build_would_build_project_0_6357", "A non-dry build would build project '{0}'"),
+        Building_project_0: diag(6358, ts.DiagnosticCategory.Message, "Building_project_0_6358", "Building project '{0}'..."),
+        Updating_output_timestamps_of_project_0: diag(6359, ts.DiagnosticCategory.Message, "Updating_output_timestamps_of_project_0_6359", "Updating output timestamps of project '{0}'..."),
+        delete_this_Project_0_is_up_to_date_because_it_was_previously_built: diag(6360, ts.DiagnosticCategory.Message, "delete_this_Project_0_is_up_to_date_because_it_was_previously_built_6360", "delete this - Project '{0}' is up to date because it was previously built"),
+        Project_0_is_up_to_date: diag(6361, ts.DiagnosticCategory.Message, "Project_0_is_up_to_date_6361", "Project '{0}' is up to date"),
+        Skipping_build_of_project_0_because_its_dependency_1_has_errors: diag(6362, ts.DiagnosticCategory.Message, "Skipping_build_of_project_0_because_its_dependency_1_has_errors_6362", "Skipping build of project '{0}' because its dependency '{1}' has errors"),
+        Project_0_can_t_be_built_because_its_dependency_1_has_errors: diag(6363, ts.DiagnosticCategory.Message, "Project_0_can_t_be_built_because_its_dependency_1_has_errors_6363", "Project '{0}' can't be built because its dependency '{1}' has errors"),
+        Build_one_or_more_projects_and_their_dependencies_if_out_of_date: diag(6364, ts.DiagnosticCategory.Message, "Build_one_or_more_projects_and_their_dependencies_if_out_of_date_6364", "Build one or more projects and their dependencies, if out of date"),
+        Delete_the_outputs_of_all_projects: diag(6365, ts.DiagnosticCategory.Message, "Delete_the_outputs_of_all_projects_6365", "Delete the outputs of all projects"),
+        Enable_verbose_logging: diag(6366, ts.DiagnosticCategory.Message, "Enable_verbose_logging_6366", "Enable verbose logging"),
+        Show_what_would_be_built_or_deleted_if_specified_with_clean: diag(6367, ts.DiagnosticCategory.Message, "Show_what_would_be_built_or_deleted_if_specified_with_clean_6367", "Show what would be built (or deleted, if specified with '--clean')"),
+        Build_all_projects_including_those_that_appear_to_be_up_to_date: diag(6368, ts.DiagnosticCategory.Message, "Build_all_projects_including_those_that_appear_to_be_up_to_date_6368", "Build all projects, including those that appear to be up to date"),
+        Option_build_must_be_the_first_command_line_argument: diag(6369, ts.DiagnosticCategory.Error, "Option_build_must_be_the_first_command_line_argument_6369", "Option '--build' must be the first command line argument."),
+        Options_0_and_1_cannot_be_combined: diag(6370, ts.DiagnosticCategory.Error, "Options_0_and_1_cannot_be_combined_6370", "Options '{0}' and '{1}' cannot be combined."),
+        Skipping_clean_because_not_all_projects_could_be_located: diag(6371, ts.DiagnosticCategory.Error, "Skipping_clean_because_not_all_projects_could_be_located_6371", "Skipping clean because not all projects could be located"),
         Variable_0_implicitly_has_an_1_type: diag(7005, ts.DiagnosticCategory.Error, "Variable_0_implicitly_has_an_1_type_7005", "Variable '{0}' implicitly has an '{1}' type."),
         Parameter_0_implicitly_has_an_1_type: diag(7006, ts.DiagnosticCategory.Error, "Parameter_0_implicitly_has_an_1_type_7006", "Parameter '{0}' implicitly has an '{1}' type."),
         Member_0_implicitly_has_an_1_type: diag(7008, ts.DiagnosticCategory.Error, "Member_0_implicitly_has_an_1_type_7008", "Member '{0}' implicitly has an '{1}' type."),
@@ -8655,8 +7439,38 @@ var ts;
     }
     ts.createScanner = createScanner;
 })(ts || (ts = {}));
-/* @internal */
+/** Non-internal stuff goes here */
 var ts;
+(function (ts) {
+    ts.emptyArray = [];
+    function closeFileWatcher(watcher) {
+        watcher.close();
+    }
+    ts.closeFileWatcher = closeFileWatcher;
+    function isExternalModuleNameRelative(moduleName) {
+        // TypeScript 1.0 spec (April 2014): 11.2.1
+        // An external module name is "relative" if the first term is "." or "..".
+        // Update: We also consider a path like `C:\foo.ts` "relative" because we do not search for it in `node_modules` or treat it as an ambient module.
+        return ts.pathIsRelative(moduleName) || ts.isRootedDiskPath(moduleName);
+    }
+    ts.isExternalModuleNameRelative = isExternalModuleNameRelative;
+    function sortAndDeduplicateDiagnostics(diagnostics) {
+        return ts.sortAndDeduplicate(diagnostics, ts.compareDiagnostics);
+    }
+    ts.sortAndDeduplicateDiagnostics = sortAndDeduplicateDiagnostics;
+    function toPath(fileName, basePath, getCanonicalFileName) {
+        var nonCanonicalizedPath = ts.isRootedDiskPath(fileName)
+            ? ts.normalizePath(fileName)
+            : ts.getNormalizedAbsolutePath(fileName, basePath);
+        return getCanonicalFileName(nonCanonicalizedPath);
+    }
+    ts.toPath = toPath;
+    function hasEntries(map) {
+        return !!map && !!map.size;
+    }
+    ts.hasEntries = hasEntries;
+})(ts || (ts = {}));
+/* @internal */
 (function (ts) {
     ts.resolvingEmptyArray = [];
     ts.emptyMap = ts.createMap();
@@ -8675,6 +7489,22 @@ var ts;
         return undefined;
     }
     ts.getDeclarationOfKind = getDeclarationOfKind;
+    /** Create a new escaped identifier map. */
+    function createUnderscoreEscapedMap() {
+        return new ts.MapCtr();
+    }
+    ts.createUnderscoreEscapedMap = createUnderscoreEscapedMap;
+    function createSymbolTable(symbols) {
+        var result = ts.createMap();
+        if (symbols) {
+            for (var _i = 0, symbols_1 = symbols; _i < symbols_1.length; _i++) {
+                var symbol = symbols_1[_i];
+                result.set(symbol.escapedName, symbol);
+            }
+        }
+        return result;
+    }
+    ts.createSymbolTable = createSymbolTable;
     var stringWriter = createSingleLineStringWriter();
     function createSingleLineStringWriter() {
         var str = "";
@@ -8710,6 +7540,80 @@ var ts;
             reportPrivateInBaseOfClassExpression: ts.noop,
         };
     }
+    function changesAffectModuleResolution(oldOptions, newOptions) {
+        return !oldOptions ||
+            (oldOptions.module !== newOptions.module) ||
+            (oldOptions.moduleResolution !== newOptions.moduleResolution) ||
+            (oldOptions.noResolve !== newOptions.noResolve) ||
+            (oldOptions.target !== newOptions.target) ||
+            (oldOptions.noLib !== newOptions.noLib) ||
+            (oldOptions.jsx !== newOptions.jsx) ||
+            (oldOptions.allowJs !== newOptions.allowJs) ||
+            (oldOptions.rootDir !== newOptions.rootDir) ||
+            (oldOptions.configFilePath !== newOptions.configFilePath) ||
+            (oldOptions.baseUrl !== newOptions.baseUrl) ||
+            (oldOptions.maxNodeModuleJsDepth !== newOptions.maxNodeModuleJsDepth) ||
+            !ts.arrayIsEqualTo(oldOptions.lib, newOptions.lib) ||
+            !ts.arrayIsEqualTo(oldOptions.typeRoots, newOptions.typeRoots) ||
+            !ts.arrayIsEqualTo(oldOptions.rootDirs, newOptions.rootDirs) ||
+            !ts.equalOwnProperties(oldOptions.paths, newOptions.paths);
+    }
+    ts.changesAffectModuleResolution = changesAffectModuleResolution;
+    function findAncestor(node, callback) {
+        while (node) {
+            var result = callback(node);
+            if (result === "quit") {
+                return undefined;
+            }
+            else if (result) {
+                return node;
+            }
+            node = node.parent;
+        }
+        return undefined;
+    }
+    ts.findAncestor = findAncestor;
+    function forEachEntry(map, callback) {
+        var _a;
+        var iterator = map.entries();
+        for (var _b = iterator.next(), pair = _b.value, done = _b.done; !done; _a = iterator.next(), pair = _a.value, done = _a.done, _a) {
+            var key = pair[0], value = pair[1];
+            var result = callback(value, key);
+            if (result) {
+                return result;
+            }
+        }
+        return undefined;
+    }
+    ts.forEachEntry = forEachEntry;
+    function forEachKey(map, callback) {
+        var _a;
+        var iterator = map.keys();
+        for (var _b = iterator.next(), key = _b.value, done = _b.done; !done; _a = iterator.next(), key = _a.value, done = _a.done, _a) {
+            var result = callback(key);
+            if (result) {
+                return result;
+            }
+        }
+        return undefined;
+    }
+    ts.forEachKey = forEachKey;
+    function copyEntries(source, target) {
+        source.forEach(function (value, key) {
+            target.set(key, value);
+        });
+    }
+    ts.copyEntries = copyEntries;
+    function arrayToSet(array, makeKey) {
+        return ts.arrayToMap(array, makeKey || (function (s) { return s; }), function () { return true; });
+    }
+    ts.arrayToSet = arrayToSet;
+    function cloneMap(map) {
+        var clone = ts.createMap();
+        copyEntries(map, clone);
+        return clone;
+    }
+    ts.cloneMap = cloneMap;
     function usingSingleLineStringWriter(action) {
         var oldString = stringWriter.getText();
         try {
@@ -9083,6 +7987,16 @@ var ts;
         return ts.isModuleDeclaration(node) && ts.isStringLiteral(node.name);
     }
     ts.isNonGlobalAmbientModule = isNonGlobalAmbientModule;
+    /**
+     * An effective module (namespace) declaration is either
+     * 1. An actual declaration: namespace X { ... }
+     * 2. A Javascript declaration, which is:
+     *    An identifier in a nested property access expression: Y in `X.Y.Z = { ... }`
+     */
+    function isEffectiveModuleDeclaration(node) {
+        return ts.isModuleDeclaration(node) || ts.isIdentifier(node);
+    }
+    ts.isEffectiveModuleDeclaration = isEffectiveModuleDeclaration;
     /** Given a symbol for a module, checks that it is a shorthand ambient module. */
     function isShorthandAmbientModuleSymbol(moduleSymbol) {
         return isShorthandAmbientModule(moduleSymbol.valueDeclaration);
@@ -9213,7 +8127,7 @@ var ts;
     // Gets the nearest enclosing block scope container that has the provided node
     // as a descendant, that is not the provided node.
     function getEnclosingBlockScopeContainer(node) {
-        return ts.findAncestor(node.parent, function (current) { return isBlockScope(current, current.parent); });
+        return findAncestor(node.parent, function (current) { return isBlockScope(current, current.parent); });
     }
     ts.getEnclosingBlockScopeContainer = getEnclosingBlockScopeContainer;
     // Return display name of an identifier
@@ -9727,11 +8641,11 @@ var ts;
     }
     ts.getTsConfigPropArray = getTsConfigPropArray;
     function getContainingFunction(node) {
-        return ts.findAncestor(node.parent, ts.isFunctionLike);
+        return findAncestor(node.parent, ts.isFunctionLike);
     }
     ts.getContainingFunction = getContainingFunction;
     function getContainingClass(node) {
-        return ts.findAncestor(node.parent, ts.isClassLike);
+        return findAncestor(node.parent, ts.isClassLike);
     }
     ts.getContainingClass = getContainingClass;
     function getThisContainer(node, includeArrowFunctions) {
@@ -10555,7 +9469,7 @@ var ts;
     }
     ts.getHostSignatureFromJSDocHost = getHostSignatureFromJSDocHost;
     function getJSDocHost(node) {
-        return ts.Debug.assertDefined(ts.findAncestor(node.parent, ts.isJSDoc)).parent;
+        return ts.Debug.assertDefined(findAncestor(node.parent, ts.isJSDoc)).parent;
     }
     ts.getJSDocHost = getJSDocHost;
     function getTypeParameterFromJsDoc(node) {
@@ -11355,13 +10269,25 @@ var ts;
         var lineStart;
         var lineCount;
         var linePos;
+        function updateLineCountAndPosFor(s) {
+            var lineStartsOfS = ts.computeLineStarts(s);
+            if (lineStartsOfS.length > 1) {
+                lineCount = lineCount + lineStartsOfS.length - 1;
+                linePos = output.length - s.length + ts.last(lineStartsOfS);
+                lineStart = (linePos - output.length) === 0;
+            }
+            else {
+                lineStart = false;
+            }
+        }
         function write(s) {
             if (s && s.length) {
                 if (lineStart) {
-                    output += getIndentString(indent);
+                    s = getIndentString(indent) + s;
                     lineStart = false;
                 }
                 output += s;
+                updateLineCountAndPosFor(s);
             }
         }
         function reset() {
@@ -11373,20 +10299,13 @@ var ts;
         }
         function rawWrite(s) {
             if (s !== undefined) {
-                if (lineStart) {
-                    lineStart = false;
-                }
                 output += s;
+                updateLineCountAndPosFor(s);
             }
         }
         function writeLiteral(s) {
             if (s && s.length) {
                 write(s);
-                var lineStartsOfS = ts.computeLineStarts(s);
-                if (lineStartsOfS.length > 1) {
-                    lineCount = lineCount + lineStartsOfS.length - 1;
-                    linePos = output.length - s.length + ts.last(lineStartsOfS);
-                }
             }
         }
         function writeLine() {
@@ -11398,7 +10317,9 @@ var ts;
             }
         }
         function writeTextOfNode(text, node) {
-            write(getTextOfNodeFromSourceText(text, node));
+            var s = getTextOfNodeFromSourceText(text, node);
+            write(s);
+            updateLineCountAndPosFor(s);
         }
         reset();
         return {
@@ -13810,6 +12731,10 @@ var ts;
         return node.kind === 275 /* Bundle */;
     }
     ts.isBundle = isBundle;
+    function isUnparsedSource(node) {
+        return node.kind === 276 /* UnparsedSource */;
+    }
+    ts.isUnparsedSource = isUnparsedSource;
     // JSDoc
     function isJSDocTypeExpression(node) {
         return node.kind === 278 /* JSDocTypeExpression */;
@@ -14779,6 +13704,1230 @@ var ts;
         return node.kind === 247 /* NamedImports */ || node.kind === 251 /* NamedExports */;
     }
     ts.isNamedImportsOrExports = isNamedImportsOrExports;
+    function Symbol(flags, name) {
+        this.flags = flags;
+        this.escapedName = name;
+        this.declarations = undefined;
+        this.valueDeclaration = undefined;
+        this.id = undefined;
+        this.mergeId = undefined;
+        this.parent = undefined;
+    }
+    function Type(checker, flags) {
+        this.flags = flags;
+        if (Debug.isDebugging) {
+            this.checker = checker;
+        }
+    }
+    function Signature() { } // tslint:disable-line no-empty
+    function Node(kind, pos, end) {
+        this.pos = pos;
+        this.end = end;
+        this.kind = kind;
+        this.id = 0;
+        this.flags = 0 /* None */;
+        this.modifierFlagsCache = 0 /* None */;
+        this.transformFlags = 0 /* None */;
+        this.parent = undefined;
+        this.original = undefined;
+    }
+    function SourceMapSource(fileName, text, skipTrivia) {
+        this.fileName = fileName;
+        this.text = text;
+        this.skipTrivia = skipTrivia || (function (pos) { return pos; });
+    }
+    ts.objectAllocator = {
+        getNodeConstructor: function () { return Node; },
+        getTokenConstructor: function () { return Node; },
+        getIdentifierConstructor: function () { return Node; },
+        getSourceFileConstructor: function () { return Node; },
+        getSymbolConstructor: function () { return Symbol; },
+        getTypeConstructor: function () { return Type; },
+        getSignatureConstructor: function () { return Signature; },
+        getSourceMapSourceConstructor: function () { return SourceMapSource; },
+    };
+    function formatStringFromArgs(text, args, baseIndex) {
+        if (baseIndex === void 0) { baseIndex = 0; }
+        return text.replace(/{(\d+)}/g, function (_match, index) { return Debug.assertDefined(args[+index + baseIndex]); });
+    }
+    ts.formatStringFromArgs = formatStringFromArgs;
+    function getLocaleSpecificMessage(message) {
+        return ts.localizedDiagnosticMessages && ts.localizedDiagnosticMessages[message.key] || message.message;
+    }
+    ts.getLocaleSpecificMessage = getLocaleSpecificMessage;
+    function createFileDiagnostic(file, start, length, message) {
+        Debug.assertGreaterThanOrEqual(start, 0);
+        Debug.assertGreaterThanOrEqual(length, 0);
+        if (file) {
+            Debug.assertLessThanOrEqual(start, file.text.length);
+            Debug.assertLessThanOrEqual(start + length, file.text.length);
+        }
+        var text = getLocaleSpecificMessage(message);
+        if (arguments.length > 4) {
+            text = formatStringFromArgs(text, arguments, 4);
+        }
+        return {
+            file: file,
+            start: start,
+            length: length,
+            messageText: text,
+            category: message.category,
+            code: message.code,
+            reportsUnnecessary: message.reportsUnnecessary,
+        };
+    }
+    ts.createFileDiagnostic = createFileDiagnostic;
+    /* @internal */
+    function formatMessage(_dummy, message) {
+        var text = getLocaleSpecificMessage(message);
+        if (arguments.length > 2) {
+            text = formatStringFromArgs(text, arguments, 2);
+        }
+        return text;
+    }
+    ts.formatMessage = formatMessage;
+    function createCompilerDiagnostic(message) {
+        var text = getLocaleSpecificMessage(message);
+        if (arguments.length > 1) {
+            text = formatStringFromArgs(text, arguments, 1);
+        }
+        return {
+            file: undefined,
+            start: undefined,
+            length: undefined,
+            messageText: text,
+            category: message.category,
+            code: message.code,
+            reportsUnnecessary: message.reportsUnnecessary,
+        };
+    }
+    ts.createCompilerDiagnostic = createCompilerDiagnostic;
+    function createCompilerDiagnosticFromMessageChain(chain) {
+        return {
+            file: undefined,
+            start: undefined,
+            length: undefined,
+            code: chain.code,
+            category: chain.category,
+            messageText: chain.next ? chain : chain.messageText,
+        };
+    }
+    ts.createCompilerDiagnosticFromMessageChain = createCompilerDiagnosticFromMessageChain;
+    function chainDiagnosticMessages(details, message) {
+        var text = getLocaleSpecificMessage(message);
+        if (arguments.length > 2) {
+            text = formatStringFromArgs(text, arguments, 2);
+        }
+        return {
+            messageText: text,
+            category: message.category,
+            code: message.code,
+            next: details
+        };
+    }
+    ts.chainDiagnosticMessages = chainDiagnosticMessages;
+    function concatenateDiagnosticMessageChains(headChain, tailChain) {
+        var lastChain = headChain;
+        while (lastChain.next) {
+            lastChain = lastChain.next;
+        }
+        lastChain.next = tailChain;
+        return headChain;
+    }
+    ts.concatenateDiagnosticMessageChains = concatenateDiagnosticMessageChains;
+    function getDiagnosticFilePath(diagnostic) {
+        return diagnostic.file ? diagnostic.file.path : undefined;
+    }
+    function compareDiagnostics(d1, d2) {
+        return ts.compareStringsCaseSensitive(getDiagnosticFilePath(d1), getDiagnosticFilePath(d2)) ||
+            ts.compareValues(d1.start, d2.start) ||
+            ts.compareValues(d1.length, d2.length) ||
+            ts.compareValues(d1.code, d2.code) ||
+            compareMessageText(d1.messageText, d2.messageText) ||
+            0 /* EqualTo */;
+    }
+    ts.compareDiagnostics = compareDiagnostics;
+    function compareMessageText(t1, t2) {
+        var text1 = t1;
+        var text2 = t2;
+        while (text1 && text2) {
+            // We still have both chains.
+            var string1 = ts.isString(text1) ? text1 : text1.messageText;
+            var string2 = ts.isString(text2) ? text2 : text2.messageText;
+            var res = ts.compareStringsCaseSensitive(string1, string2);
+            if (res) {
+                return res;
+            }
+            text1 = ts.isString(text1) ? undefined : text1.next;
+            text2 = ts.isString(text2) ? undefined : text2.next;
+        }
+        if (!text1 && !text2) {
+            // if the chains are done, then these messages are the same.
+            return 0 /* EqualTo */;
+        }
+        // We still have one chain remaining.  The shorter chain should come first.
+        return text1 ? 1 /* GreaterThan */ : -1 /* LessThan */;
+    }
+    function getEmitScriptTarget(compilerOptions) {
+        return compilerOptions.target || 0 /* ES3 */;
+    }
+    ts.getEmitScriptTarget = getEmitScriptTarget;
+    function getEmitModuleKind(compilerOptions) {
+        return typeof compilerOptions.module === "number" ?
+            compilerOptions.module :
+            getEmitScriptTarget(compilerOptions) >= 2 /* ES2015 */ ? ts.ModuleKind.ES2015 : ts.ModuleKind.CommonJS;
+    }
+    ts.getEmitModuleKind = getEmitModuleKind;
+    function getEmitModuleResolutionKind(compilerOptions) {
+        var moduleResolution = compilerOptions.moduleResolution;
+        if (moduleResolution === undefined) {
+            moduleResolution = getEmitModuleKind(compilerOptions) === ts.ModuleKind.CommonJS ? ts.ModuleResolutionKind.NodeJs : ts.ModuleResolutionKind.Classic;
+        }
+        return moduleResolution;
+    }
+    ts.getEmitModuleResolutionKind = getEmitModuleResolutionKind;
+    function unreachableCodeIsError(options) {
+        return options.allowUnreachableCode === false;
+    }
+    ts.unreachableCodeIsError = unreachableCodeIsError;
+    function unusedLabelIsError(options) {
+        return options.allowUnusedLabels === false;
+    }
+    ts.unusedLabelIsError = unusedLabelIsError;
+    function getAreDeclarationMapsEnabled(options) {
+        return !!(options.declaration && options.declarationMap);
+    }
+    ts.getAreDeclarationMapsEnabled = getAreDeclarationMapsEnabled;
+    function getAllowSyntheticDefaultImports(compilerOptions) {
+        var moduleKind = getEmitModuleKind(compilerOptions);
+        return compilerOptions.allowSyntheticDefaultImports !== undefined
+            ? compilerOptions.allowSyntheticDefaultImports
+            : compilerOptions.esModuleInterop
+                ? moduleKind !== ts.ModuleKind.None && moduleKind < ts.ModuleKind.ES2015
+                : moduleKind === ts.ModuleKind.System;
+    }
+    ts.getAllowSyntheticDefaultImports = getAllowSyntheticDefaultImports;
+    function getEmitDeclarations(compilerOptions) {
+        return !!(compilerOptions.declaration || compilerOptions.composite);
+    }
+    ts.getEmitDeclarations = getEmitDeclarations;
+    function getStrictOptionValue(compilerOptions, flag) {
+        return compilerOptions[flag] === undefined ? !!compilerOptions.strict : !!compilerOptions[flag];
+    }
+    ts.getStrictOptionValue = getStrictOptionValue;
+    function hasZeroOrOneAsteriskCharacter(str) {
+        var seenAsterisk = false;
+        for (var i = 0; i < str.length; i++) {
+            if (str.charCodeAt(i) === 42 /* asterisk */) {
+                if (!seenAsterisk) {
+                    seenAsterisk = true;
+                }
+                else {
+                    // have already seen asterisk
+                    return false;
+                }
+            }
+        }
+        return true;
+    }
+    ts.hasZeroOrOneAsteriskCharacter = hasZeroOrOneAsteriskCharacter;
+    /**
+     * Internally, we represent paths as strings with '/' as the directory separator.
+     * When we make system calls (eg: LanguageServiceHost.getDirectory()),
+     * we expect the host to correctly handle paths in our specified format.
+     */
+    ts.directorySeparator = "/";
+    var altDirectorySeparator = "\\";
+    var urlSchemeSeparator = "://";
+    var backslashRegExp = /\\/g;
+    /**
+     * Normalize path separators.
+     */
+    function normalizeSlashes(path) {
+        return path.replace(backslashRegExp, ts.directorySeparator);
+    }
+    ts.normalizeSlashes = normalizeSlashes;
+    function isVolumeCharacter(charCode) {
+        return (charCode >= 97 /* a */ && charCode <= 122 /* z */) ||
+            (charCode >= 65 /* A */ && charCode <= 90 /* Z */);
+    }
+    function getFileUrlVolumeSeparatorEnd(url, start) {
+        var ch0 = url.charCodeAt(start);
+        if (ch0 === 58 /* colon */)
+            return start + 1;
+        if (ch0 === 37 /* percent */ && url.charCodeAt(start + 1) === 51 /* _3 */) {
+            var ch2 = url.charCodeAt(start + 2);
+            if (ch2 === 97 /* a */ || ch2 === 65 /* A */)
+                return start + 3;
+        }
+        return -1;
+    }
+    /**
+     * Returns length of the root part of a path or URL (i.e. length of "/", "x:/", "//server/share/, file:///user/files").
+     * If the root is part of a URL, the twos-complement of the root length is returned.
+     */
+    function getEncodedRootLength(path) {
+        if (!path)
+            return 0;
+        var ch0 = path.charCodeAt(0);
+        // POSIX or UNC
+        if (ch0 === 47 /* slash */ || ch0 === 92 /* backslash */) {
+            if (path.charCodeAt(1) !== ch0)
+                return 1; // POSIX: "/" (or non-normalized "\")
+            var p1 = path.indexOf(ch0 === 47 /* slash */ ? ts.directorySeparator : altDirectorySeparator, 2);
+            if (p1 < 0)
+                return path.length; // UNC: "//server" or "\\server"
+            return p1 + 1; // UNC: "//server/" or "\\server\"
+        }
+        // DOS
+        if (isVolumeCharacter(ch0) && path.charCodeAt(1) === 58 /* colon */) {
+            var ch2 = path.charCodeAt(2);
+            if (ch2 === 47 /* slash */ || ch2 === 92 /* backslash */)
+                return 3; // DOS: "c:/" or "c:\"
+            if (path.length === 2)
+                return 2; // DOS: "c:" (but not "c:d")
+        }
+        // URL
+        var schemeEnd = path.indexOf(urlSchemeSeparator);
+        if (schemeEnd !== -1) {
+            var authorityStart = schemeEnd + urlSchemeSeparator.length;
+            var authorityEnd = path.indexOf(ts.directorySeparator, authorityStart);
+            if (authorityEnd !== -1) { // URL: "file:///", "file://server/", "file://server/path"
+                // For local "file" URLs, include the leading DOS volume (if present).
+                // Per https://www.ietf.org/rfc/rfc1738.txt, a host of "" or "localhost" is a
+                // special case interpreted as "the machine from which the URL is being interpreted".
+                var scheme = path.slice(0, schemeEnd);
+                var authority = path.slice(authorityStart, authorityEnd);
+                if (scheme === "file" && (authority === "" || authority === "localhost") &&
+                    isVolumeCharacter(path.charCodeAt(authorityEnd + 1))) {
+                    var volumeSeparatorEnd = getFileUrlVolumeSeparatorEnd(path, authorityEnd + 2);
+                    if (volumeSeparatorEnd !== -1) {
+                        if (path.charCodeAt(volumeSeparatorEnd) === 47 /* slash */) {
+                            // URL: "file:///c:/", "file://localhost/c:/", "file:///c%3a/", "file://localhost/c%3a/"
+                            return ~(volumeSeparatorEnd + 1);
+                        }
+                        if (volumeSeparatorEnd === path.length) {
+                            // URL: "file:///c:", "file://localhost/c:", "file:///c$3a", "file://localhost/c%3a"
+                            // but not "file:///c:d" or "file:///c%3ad"
+                            return ~volumeSeparatorEnd;
+                        }
+                    }
+                }
+                return ~(authorityEnd + 1); // URL: "file://server/", "http://server/"
+            }
+            return ~path.length; // URL: "file://server", "http://server"
+        }
+        // relative
+        return 0;
+    }
+    /**
+     * Returns length of the root part of a path or URL (i.e. length of "/", "x:/", "//server/share/, file:///user/files").
+     *
+     * For example:
+     * ```ts
+     * getRootLength("a") === 0                   // ""
+     * getRootLength("/") === 1                   // "/"
+     * getRootLength("c:") === 2                  // "c:"
+     * getRootLength("c:d") === 0                 // ""
+     * getRootLength("c:/") === 3                 // "c:/"
+     * getRootLength("c:\\") === 3                // "c:\\"
+     * getRootLength("//server") === 7            // "//server"
+     * getRootLength("//server/share") === 8      // "//server/"
+     * getRootLength("\\\\server") === 7          // "\\\\server"
+     * getRootLength("\\\\server\\share") === 8   // "\\\\server\\"
+     * getRootLength("file:///path") === 8        // "file:///"
+     * getRootLength("file:///c:") === 10         // "file:///c:"
+     * getRootLength("file:///c:d") === 8         // "file:///"
+     * getRootLength("file:///c:/path") === 11    // "file:///c:/"
+     * getRootLength("file://server") === 13      // "file://server"
+     * getRootLength("file://server/path") === 14 // "file://server/"
+     * getRootLength("http://server") === 13      // "http://server"
+     * getRootLength("http://server/path") === 14 // "http://server/"
+     * ```
+     */
+    function getRootLength(path) {
+        var rootLength = getEncodedRootLength(path);
+        return rootLength < 0 ? ~rootLength : rootLength;
+    }
+    ts.getRootLength = getRootLength;
+    // TODO(rbuckton): replace references with `resolvePath`
+    function normalizePath(path) {
+        return resolvePath(path);
+    }
+    ts.normalizePath = normalizePath;
+    function normalizePathAndParts(path) {
+        path = normalizeSlashes(path);
+        var _a = reducePathComponents(getPathComponents(path)), root = _a[0], parts = _a.slice(1);
+        if (parts.length) {
+            var joinedParts = root + parts.join(ts.directorySeparator);
+            return { path: hasTrailingDirectorySeparator(path) ? ensureTrailingDirectorySeparator(joinedParts) : joinedParts, parts: parts };
+        }
+        else {
+            return { path: root, parts: parts };
+        }
+    }
+    ts.normalizePathAndParts = normalizePathAndParts;
+    function getDirectoryPath(path) {
+        path = normalizeSlashes(path);
+        // If the path provided is itself the root, then return it.
+        var rootLength = getRootLength(path);
+        if (rootLength === path.length)
+            return path;
+        // return the leading portion of the path up to the last (non-terminal) directory separator
+        // but not including any trailing directory separator.
+        path = removeTrailingDirectorySeparator(path);
+        return path.slice(0, Math.max(rootLength, path.lastIndexOf(ts.directorySeparator)));
+    }
+    ts.getDirectoryPath = getDirectoryPath;
+    function isUrl(path) {
+        return getEncodedRootLength(path) < 0;
+    }
+    ts.isUrl = isUrl;
+    function pathIsRelative(path) {
+        return /^\.\.?($|[\\/])/.test(path);
+    }
+    ts.pathIsRelative = pathIsRelative;
+    /**
+     * Determines whether a path is an absolute path (e.g. starts with `/`, or a dos path
+     * like `c:`, `c:\` or `c:/`).
+     */
+    function isRootedDiskPath(path) {
+        return getEncodedRootLength(path) > 0;
+    }
+    ts.isRootedDiskPath = isRootedDiskPath;
+    /**
+     * Determines whether a path consists only of a path root.
+     */
+    function isDiskPathRoot(path) {
+        var rootLength = getEncodedRootLength(path);
+        return rootLength > 0 && rootLength === path.length;
+    }
+    ts.isDiskPathRoot = isDiskPathRoot;
+    function convertToRelativePath(absoluteOrRelativePath, basePath, getCanonicalFileName) {
+        return !isRootedDiskPath(absoluteOrRelativePath)
+            ? absoluteOrRelativePath
+            : getRelativePathToDirectoryOrUrl(basePath, absoluteOrRelativePath, basePath, getCanonicalFileName, /*isAbsolutePathAnUrl*/ false);
+    }
+    ts.convertToRelativePath = convertToRelativePath;
+    function pathComponents(path, rootLength) {
+        var root = path.substring(0, rootLength);
+        var rest = path.substring(rootLength).split(ts.directorySeparator);
+        if (rest.length && !ts.lastOrUndefined(rest))
+            rest.pop();
+        return [root].concat(rest);
+    }
+    /**
+     * Parse a path into an array containing a root component (at index 0) and zero or more path
+     * components (at indices > 0). The result is not normalized.
+     * If the path is relative, the root component is `""`.
+     * If the path is absolute, the root component includes the first path separator (`/`).
+     */
+    function getPathComponents(path, currentDirectory) {
+        if (currentDirectory === void 0) { currentDirectory = ""; }
+        path = combinePaths(currentDirectory, path);
+        var rootLength = getRootLength(path);
+        return pathComponents(path, rootLength);
+    }
+    ts.getPathComponents = getPathComponents;
+    /**
+     * Reduce an array of path components to a more simplified path by navigating any
+     * `"."` or `".."` entries in the path.
+     */
+    function reducePathComponents(components) {
+        if (!ts.some(components))
+            return [];
+        var reduced = [components[0]];
+        for (var i = 1; i < components.length; i++) {
+            var component = components[i];
+            if (!component)
+                continue;
+            if (component === ".")
+                continue;
+            if (component === "..") {
+                if (reduced.length > 1) {
+                    if (reduced[reduced.length - 1] !== "..") {
+                        reduced.pop();
+                        continue;
+                    }
+                }
+                else if (reduced[0])
+                    continue;
+            }
+            reduced.push(component);
+        }
+        return reduced;
+    }
+    ts.reducePathComponents = reducePathComponents;
+    /**
+     * Parse a path into an array containing a root component (at index 0) and zero or more path
+     * components (at indices > 0). The result is normalized.
+     * If the path is relative, the root component is `""`.
+     * If the path is absolute, the root component includes the first path separator (`/`).
+     */
+    function getNormalizedPathComponents(path, currentDirectory) {
+        return reducePathComponents(getPathComponents(path, currentDirectory));
+    }
+    ts.getNormalizedPathComponents = getNormalizedPathComponents;
+    function getNormalizedAbsolutePath(fileName, currentDirectory) {
+        return getPathFromPathComponents(getNormalizedPathComponents(fileName, currentDirectory));
+    }
+    ts.getNormalizedAbsolutePath = getNormalizedAbsolutePath;
+    /**
+     * Formats a parsed path consisting of a root component (at index 0) and zero or more path
+     * segments (at indices > 0).
+     */
+    function getPathFromPathComponents(pathComponents) {
+        if (pathComponents.length === 0)
+            return "";
+        var root = pathComponents[0] && ensureTrailingDirectorySeparator(pathComponents[0]);
+        if (pathComponents.length === 1)
+            return root;
+        return root + pathComponents.slice(1).join(ts.directorySeparator);
+    }
+    ts.getPathFromPathComponents = getPathFromPathComponents;
+    function getPathComponentsRelativeTo(from, to, stringEqualityComparer, getCanonicalFileName) {
+        var fromComponents = reducePathComponents(getPathComponents(from));
+        var toComponents = reducePathComponents(getPathComponents(to));
+        var start;
+        for (start = 0; start < fromComponents.length && start < toComponents.length; start++) {
+            var fromComponent = getCanonicalFileName(fromComponents[start]);
+            var toComponent = getCanonicalFileName(toComponents[start]);
+            var comparer = start === 0 ? ts.equateStringsCaseInsensitive : stringEqualityComparer;
+            if (!comparer(fromComponent, toComponent))
+                break;
+        }
+        if (start === 0) {
+            return toComponents;
+        }
+        var components = toComponents.slice(start);
+        var relative = [];
+        for (; start < fromComponents.length; start++) {
+            relative.push("..");
+        }
+        return [""].concat(relative, components);
+    }
+    function getRelativePathFromFile(from, to, getCanonicalFileName) {
+        return ensurePathIsNonModuleName(getRelativePathFromDirectory(getDirectoryPath(from), to, getCanonicalFileName));
+    }
+    ts.getRelativePathFromFile = getRelativePathFromFile;
+    function getRelativePathFromDirectory(fromDirectory, to, getCanonicalFileNameOrIgnoreCase) {
+        Debug.assert((getRootLength(fromDirectory) > 0) === (getRootLength(to) > 0), "Paths must either both be absolute or both be relative");
+        var getCanonicalFileName = typeof getCanonicalFileNameOrIgnoreCase === "function" ? getCanonicalFileNameOrIgnoreCase : ts.identity;
+        var ignoreCase = typeof getCanonicalFileNameOrIgnoreCase === "boolean" ? getCanonicalFileNameOrIgnoreCase : false;
+        var pathComponents = getPathComponentsRelativeTo(fromDirectory, to, ignoreCase ? ts.equateStringsCaseInsensitive : ts.equateStringsCaseSensitive, getCanonicalFileName);
+        return getPathFromPathComponents(pathComponents);
+    }
+    ts.getRelativePathFromDirectory = getRelativePathFromDirectory;
+    function getRelativePathToDirectoryOrUrl(directoryPathOrUrl, relativeOrAbsolutePath, currentDirectory, getCanonicalFileName, isAbsolutePathAnUrl) {
+        var pathComponents = getPathComponentsRelativeTo(resolvePath(currentDirectory, directoryPathOrUrl), resolvePath(currentDirectory, relativeOrAbsolutePath), ts.equateStringsCaseSensitive, getCanonicalFileName);
+        var firstComponent = pathComponents[0];
+        if (isAbsolutePathAnUrl && isRootedDiskPath(firstComponent)) {
+            var prefix = firstComponent.charAt(0) === ts.directorySeparator ? "file://" : "file:///";
+            pathComponents[0] = prefix + firstComponent;
+        }
+        return getPathFromPathComponents(pathComponents);
+    }
+    ts.getRelativePathToDirectoryOrUrl = getRelativePathToDirectoryOrUrl;
+    /**
+     * Ensures a path is either absolute (prefixed with `/` or `c:`) or dot-relative (prefixed
+     * with `./` or `../`) so as not to be confused with an unprefixed module name.
+     */
+    function ensurePathIsNonModuleName(path) {
+        return getRootLength(path) === 0 && !pathIsRelative(path) ? "./" + path : path;
+    }
+    ts.ensurePathIsNonModuleName = ensurePathIsNonModuleName;
+    function getBaseFileName(path, extensions, ignoreCase) {
+        path = normalizeSlashes(path);
+        // if the path provided is itself the root, then it has not file name.
+        var rootLength = getRootLength(path);
+        if (rootLength === path.length)
+            return "";
+        // return the trailing portion of the path starting after the last (non-terminal) directory
+        // separator but not including any trailing directory separator.
+        path = removeTrailingDirectorySeparator(path);
+        var name = path.slice(Math.max(getRootLength(path), path.lastIndexOf(ts.directorySeparator) + 1));
+        var extension = extensions !== undefined && ignoreCase !== undefined ? getAnyExtensionFromPath(name, extensions, ignoreCase) : undefined;
+        return extension ? name.slice(0, name.length - extension.length) : name;
+    }
+    ts.getBaseFileName = getBaseFileName;
+    /**
+     * Combines paths. If a path is absolute, it replaces any previous path.
+     */
+    function combinePaths(path) {
+        var paths = [];
+        for (var _i = 1; _i < arguments.length; _i++) {
+            paths[_i - 1] = arguments[_i];
+        }
+        if (path)
+            path = normalizeSlashes(path);
+        for (var _a = 0, paths_1 = paths; _a < paths_1.length; _a++) {
+            var relativePath = paths_1[_a];
+            if (!relativePath)
+                continue;
+            relativePath = normalizeSlashes(relativePath);
+            if (!path || getRootLength(relativePath) !== 0) {
+                path = relativePath;
+            }
+            else {
+                path = ensureTrailingDirectorySeparator(path) + relativePath;
+            }
+        }
+        return path;
+    }
+    ts.combinePaths = combinePaths;
+    /**
+     * Combines and resolves paths. If a path is absolute, it replaces any previous path. Any
+     * `.` and `..` path components are resolved.
+     */
+    function resolvePath(path) {
+        var paths = [];
+        for (var _i = 1; _i < arguments.length; _i++) {
+            paths[_i - 1] = arguments[_i];
+        }
+        var combined = ts.some(paths) ? combinePaths.apply(void 0, [path].concat(paths)) : normalizeSlashes(path);
+        var normalized = getPathFromPathComponents(reducePathComponents(getPathComponents(combined)));
+        return normalized && hasTrailingDirectorySeparator(combined) ? ensureTrailingDirectorySeparator(normalized) : normalized;
+    }
+    ts.resolvePath = resolvePath;
+    /**
+     * Determines whether a path has a trailing separator (`/` or `\\`).
+     */
+    function hasTrailingDirectorySeparator(path) {
+        if (path.length === 0)
+            return false;
+        var ch = path.charCodeAt(path.length - 1);
+        return ch === 47 /* slash */ || ch === 92 /* backslash */;
+    }
+    ts.hasTrailingDirectorySeparator = hasTrailingDirectorySeparator;
+    function removeTrailingDirectorySeparator(path) {
+        if (hasTrailingDirectorySeparator(path)) {
+            return path.substr(0, path.length - 1);
+        }
+        return path;
+    }
+    ts.removeTrailingDirectorySeparator = removeTrailingDirectorySeparator;
+    function ensureTrailingDirectorySeparator(path) {
+        if (!hasTrailingDirectorySeparator(path)) {
+            return path + ts.directorySeparator;
+        }
+        return path;
+    }
+    ts.ensureTrailingDirectorySeparator = ensureTrailingDirectorySeparator;
+    function comparePathsWorker(a, b, componentComparer) {
+        if (a === b)
+            return 0 /* EqualTo */;
+        if (a === undefined)
+            return -1 /* LessThan */;
+        if (b === undefined)
+            return 1 /* GreaterThan */;
+        var aComponents = reducePathComponents(getPathComponents(a));
+        var bComponents = reducePathComponents(getPathComponents(b));
+        var sharedLength = Math.min(aComponents.length, bComponents.length);
+        for (var i = 0; i < sharedLength; i++) {
+            var stringComparer = i === 0 ? ts.compareStringsCaseInsensitive : componentComparer;
+            var result = stringComparer(aComponents[i], bComponents[i]);
+            if (result !== 0 /* EqualTo */) {
+                return result;
+            }
+        }
+        return ts.compareValues(aComponents.length, bComponents.length);
+    }
+    /**
+     * Performs a case-sensitive comparison of two paths.
+     */
+    function comparePathsCaseSensitive(a, b) {
+        return comparePathsWorker(a, b, ts.compareStringsCaseSensitive);
+    }
+    ts.comparePathsCaseSensitive = comparePathsCaseSensitive;
+    /**
+     * Performs a case-insensitive comparison of two paths.
+     */
+    function comparePathsCaseInsensitive(a, b) {
+        return comparePathsWorker(a, b, ts.compareStringsCaseInsensitive);
+    }
+    ts.comparePathsCaseInsensitive = comparePathsCaseInsensitive;
+    function comparePaths(a, b, currentDirectory, ignoreCase) {
+        if (typeof currentDirectory === "string") {
+            a = combinePaths(currentDirectory, a);
+            b = combinePaths(currentDirectory, b);
+        }
+        else if (typeof currentDirectory === "boolean") {
+            ignoreCase = currentDirectory;
+        }
+        return comparePathsWorker(a, b, ts.getStringComparer(ignoreCase));
+    }
+    ts.comparePaths = comparePaths;
+    function containsPath(parent, child, currentDirectory, ignoreCase) {
+        if (typeof currentDirectory === "string") {
+            parent = combinePaths(currentDirectory, parent);
+            child = combinePaths(currentDirectory, child);
+        }
+        else if (typeof currentDirectory === "boolean") {
+            ignoreCase = currentDirectory;
+        }
+        if (parent === undefined || child === undefined)
+            return false;
+        if (parent === child)
+            return true;
+        var parentComponents = reducePathComponents(getPathComponents(parent));
+        var childComponents = reducePathComponents(getPathComponents(child));
+        if (childComponents.length < parentComponents.length) {
+            return false;
+        }
+        var componentEqualityComparer = ignoreCase ? ts.equateStringsCaseInsensitive : ts.equateStringsCaseSensitive;
+        for (var i = 0; i < parentComponents.length; i++) {
+            var equalityComparer = i === 0 ? ts.equateStringsCaseInsensitive : componentEqualityComparer;
+            if (!equalityComparer(parentComponents[i], childComponents[i])) {
+                return false;
+            }
+        }
+        return true;
+    }
+    ts.containsPath = containsPath;
+    function tryRemoveDirectoryPrefix(path, dirPath) {
+        var a = ts.tryRemovePrefix(path, dirPath);
+        if (a === undefined)
+            return undefined;
+        switch (a.charCodeAt(0)) {
+            case 47 /* slash */:
+            case 92 /* backslash */:
+                return a.slice(1);
+            default:
+                return undefined;
+        }
+    }
+    ts.tryRemoveDirectoryPrefix = tryRemoveDirectoryPrefix;
+    // Reserved characters, forces escaping of any non-word (or digit), non-whitespace character.
+    // It may be inefficient (we could just match (/[-[\]{}()*+?.,\\^$|#\s]/g), but this is future
+    // proof.
+    var reservedCharacterPattern = /[^\w\s\/]/g;
+    var wildcardCharCodes = [42 /* asterisk */, 63 /* question */];
+    function hasExtension(fileName) {
+        return ts.stringContains(getBaseFileName(fileName), ".");
+    }
+    ts.hasExtension = hasExtension;
+    ts.commonPackageFolders = ["node_modules", "bower_components", "jspm_packages"];
+    var implicitExcludePathRegexPattern = "(?!(" + ts.commonPackageFolders.join("|") + ")(/|$))";
+    var filesMatcher = {
+        /**
+         * Matches any single directory segment unless it is the last segment and a .min.js file
+         * Breakdown:
+         *  [^./]                   # matches everything up to the first . character (excluding directory separators)
+         *  (\\.(?!min\\.js$))?     # matches . characters but not if they are part of the .min.js file extension
+         */
+        singleAsteriskRegexFragment: "([^./]|(\\.(?!min\\.js$))?)*",
+        /**
+         * Regex for the ** wildcard. Matches any number of subdirectories. When used for including
+         * files or directories, does not match subdirectories that start with a . character
+         */
+        doubleAsteriskRegexFragment: "(/" + implicitExcludePathRegexPattern + "[^/.][^/]*)*?",
+        replaceWildcardCharacter: function (match) { return replaceWildcardCharacter(match, filesMatcher.singleAsteriskRegexFragment); }
+    };
+    var directoriesMatcher = {
+        singleAsteriskRegexFragment: "[^/]*",
+        /**
+         * Regex for the ** wildcard. Matches any number of subdirectories. When used for including
+         * files or directories, does not match subdirectories that start with a . character
+         */
+        doubleAsteriskRegexFragment: "(/" + implicitExcludePathRegexPattern + "[^/.][^/]*)*?",
+        replaceWildcardCharacter: function (match) { return replaceWildcardCharacter(match, directoriesMatcher.singleAsteriskRegexFragment); }
+    };
+    var excludeMatcher = {
+        singleAsteriskRegexFragment: "[^/]*",
+        doubleAsteriskRegexFragment: "(/.+?)?",
+        replaceWildcardCharacter: function (match) { return replaceWildcardCharacter(match, excludeMatcher.singleAsteriskRegexFragment); }
+    };
+    var wildcardMatchers = {
+        files: filesMatcher,
+        directories: directoriesMatcher,
+        exclude: excludeMatcher
+    };
+    function getRegularExpressionForWildcard(specs, basePath, usage) {
+        var patterns = getRegularExpressionsForWildcards(specs, basePath, usage);
+        if (!patterns || !patterns.length) {
+            return undefined;
+        }
+        var pattern = patterns.map(function (pattern) { return "(" + pattern + ")"; }).join("|");
+        // If excluding, match "foo/bar/baz...", but if including, only allow "foo".
+        var terminator = usage === "exclude" ? "($|/)" : "$";
+        return "^(" + pattern + ")" + terminator;
+    }
+    ts.getRegularExpressionForWildcard = getRegularExpressionForWildcard;
+    function getRegularExpressionsForWildcards(specs, basePath, usage) {
+        if (specs === undefined || specs.length === 0) {
+            return undefined;
+        }
+        return ts.flatMap(specs, function (spec) {
+            return spec && getSubPatternFromSpec(spec, basePath, usage, wildcardMatchers[usage]);
+        });
+    }
+    /**
+     * An "includes" path "foo" is implicitly a glob "foo/** /*" (without the space) if its last component has no extension,
+     * and does not contain any glob characters itself.
+     */
+    function isImplicitGlob(lastPathComponent) {
+        return !/[.*?]/.test(lastPathComponent);
+    }
+    ts.isImplicitGlob = isImplicitGlob;
+    function getSubPatternFromSpec(spec, basePath, usage, _a) {
+        var singleAsteriskRegexFragment = _a.singleAsteriskRegexFragment, doubleAsteriskRegexFragment = _a.doubleAsteriskRegexFragment, replaceWildcardCharacter = _a.replaceWildcardCharacter;
+        var subpattern = "";
+        var hasWrittenComponent = false;
+        var components = getNormalizedPathComponents(spec, basePath);
+        var lastComponent = ts.last(components);
+        if (usage !== "exclude" && lastComponent === "**") {
+            return undefined;
+        }
+        // getNormalizedPathComponents includes the separator for the root component.
+        // We need to remove to create our regex correctly.
+        components[0] = removeTrailingDirectorySeparator(components[0]);
+        if (isImplicitGlob(lastComponent)) {
+            components.push("**", "*");
+        }
+        var optionalCount = 0;
+        for (var _i = 0, components_1 = components; _i < components_1.length; _i++) {
+            var component = components_1[_i];
+            if (component === "**") {
+                subpattern += doubleAsteriskRegexFragment;
+            }
+            else {
+                if (usage === "directories") {
+                    subpattern += "(";
+                    optionalCount++;
+                }
+                if (hasWrittenComponent) {
+                    subpattern += ts.directorySeparator;
+                }
+                if (usage !== "exclude") {
+                    var componentPattern = "";
+                    // The * and ? wildcards should not match directories or files that start with . if they
+                    // appear first in a component. Dotted directories and files can be included explicitly
+                    // like so: **/.*/.*
+                    if (component.charCodeAt(0) === 42 /* asterisk */) {
+                        componentPattern += "([^./]" + singleAsteriskRegexFragment + ")?";
+                        component = component.substr(1);
+                    }
+                    else if (component.charCodeAt(0) === 63 /* question */) {
+                        componentPattern += "[^./]";
+                        component = component.substr(1);
+                    }
+                    componentPattern += component.replace(reservedCharacterPattern, replaceWildcardCharacter);
+                    // Patterns should not include subfolders like node_modules unless they are
+                    // explicitly included as part of the path.
+                    //
+                    // As an optimization, if the component pattern is the same as the component,
+                    // then there definitely were no wildcard characters and we do not need to
+                    // add the exclusion pattern.
+                    if (componentPattern !== component) {
+                        subpattern += implicitExcludePathRegexPattern;
+                    }
+                    subpattern += componentPattern;
+                }
+                else {
+                    subpattern += component.replace(reservedCharacterPattern, replaceWildcardCharacter);
+                }
+            }
+            hasWrittenComponent = true;
+        }
+        while (optionalCount > 0) {
+            subpattern += ")?";
+            optionalCount--;
+        }
+        return subpattern;
+    }
+    function replaceWildcardCharacter(match, singleAsteriskRegexFragment) {
+        return match === "*" ? singleAsteriskRegexFragment : match === "?" ? "[^/]" : "\\" + match;
+    }
+    /** @param path directory of the tsconfig.json */
+    function getFileMatcherPatterns(path, excludes, includes, useCaseSensitiveFileNames, currentDirectory) {
+        path = normalizePath(path);
+        currentDirectory = normalizePath(currentDirectory);
+        var absolutePath = combinePaths(currentDirectory, path);
+        return {
+            includeFilePatterns: ts.map(getRegularExpressionsForWildcards(includes, absolutePath, "files"), function (pattern) { return "^" + pattern + "$"; }),
+            includeFilePattern: getRegularExpressionForWildcard(includes, absolutePath, "files"),
+            includeDirectoryPattern: getRegularExpressionForWildcard(includes, absolutePath, "directories"),
+            excludePattern: getRegularExpressionForWildcard(excludes, absolutePath, "exclude"),
+            basePaths: getBasePaths(path, includes, useCaseSensitiveFileNames)
+        };
+    }
+    ts.getFileMatcherPatterns = getFileMatcherPatterns;
+    function getRegexFromPattern(pattern, useCaseSensitiveFileNames) {
+        return new RegExp(pattern, useCaseSensitiveFileNames ? "" : "i");
+    }
+    ts.getRegexFromPattern = getRegexFromPattern;
+    /** @param path directory of the tsconfig.json */
+    function matchFiles(path, extensions, excludes, includes, useCaseSensitiveFileNames, currentDirectory, depth, getFileSystemEntries) {
+        path = normalizePath(path);
+        currentDirectory = normalizePath(currentDirectory);
+        var patterns = getFileMatcherPatterns(path, excludes, includes, useCaseSensitiveFileNames, currentDirectory);
+        var includeFileRegexes = patterns.includeFilePatterns && patterns.includeFilePatterns.map(function (pattern) { return getRegexFromPattern(pattern, useCaseSensitiveFileNames); });
+        var includeDirectoryRegex = patterns.includeDirectoryPattern && getRegexFromPattern(patterns.includeDirectoryPattern, useCaseSensitiveFileNames);
+        var excludeRegex = patterns.excludePattern && getRegexFromPattern(patterns.excludePattern, useCaseSensitiveFileNames);
+        // Associate an array of results with each include regex. This keeps results in order of the "include" order.
+        // If there are no "includes", then just put everything in results[0].
+        var results = includeFileRegexes ? includeFileRegexes.map(function () { return []; }) : [[]];
+        for (var _i = 0, _a = patterns.basePaths; _i < _a.length; _i++) {
+            var basePath = _a[_i];
+            visitDirectory(basePath, combinePaths(currentDirectory, basePath), depth);
+        }
+        return ts.flatten(results);
+        function visitDirectory(path, absolutePath, depth) {
+            var _a = getFileSystemEntries(path), files = _a.files, directories = _a.directories;
+            var _loop_1 = function (current) {
+                var name = combinePaths(path, current);
+                var absoluteName = combinePaths(absolutePath, current);
+                if (extensions && !ts.fileExtensionIsOneOf(name, extensions))
+                    return "continue";
+                if (excludeRegex && excludeRegex.test(absoluteName))
+                    return "continue";
+                if (!includeFileRegexes) {
+                    results[0].push(name);
+                }
+                else {
+                    var includeIndex = ts.findIndex(includeFileRegexes, function (re) { return re.test(absoluteName); });
+                    if (includeIndex !== -1) {
+                        results[includeIndex].push(name);
+                    }
+                }
+            };
+            for (var _i = 0, _b = ts.sort(files, ts.compareStringsCaseSensitive); _i < _b.length; _i++) {
+                var current = _b[_i];
+                _loop_1(current);
+            }
+            if (depth !== undefined) {
+                depth--;
+                if (depth === 0) {
+                    return;
+                }
+            }
+            for (var _c = 0, _d = ts.sort(directories, ts.compareStringsCaseSensitive); _c < _d.length; _c++) {
+                var current = _d[_c];
+                var name = combinePaths(path, current);
+                var absoluteName = combinePaths(absolutePath, current);
+                if ((!includeDirectoryRegex || includeDirectoryRegex.test(absoluteName)) &&
+                    (!excludeRegex || !excludeRegex.test(absoluteName))) {
+                    visitDirectory(name, absoluteName, depth);
+                }
+            }
+        }
+    }
+    ts.matchFiles = matchFiles;
+    /**
+     * Computes the unique non-wildcard base paths amongst the provided include patterns.
+     */
+    function getBasePaths(path, includes, useCaseSensitiveFileNames) {
+        // Storage for our results in the form of literal paths (e.g. the paths as written by the user).
+        var basePaths = [path];
+        if (includes) {
+            // Storage for literal base paths amongst the include patterns.
+            var includeBasePaths = [];
+            for (var _i = 0, includes_1 = includes; _i < includes_1.length; _i++) {
+                var include = includes_1[_i];
+                // We also need to check the relative paths by converting them to absolute and normalizing
+                // in case they escape the base path (e.g "..\somedirectory")
+                var absolute = isRootedDiskPath(include) ? include : normalizePath(combinePaths(path, include));
+                // Append the literal and canonical candidate base paths.
+                includeBasePaths.push(getIncludeBasePath(absolute));
+            }
+            // Sort the offsets array using either the literal or canonical path representations.
+            includeBasePaths.sort(ts.getStringComparer(!useCaseSensitiveFileNames));
+            var _loop_2 = function (includeBasePath) {
+                if (ts.every(basePaths, function (basePath) { return !containsPath(basePath, includeBasePath, path, !useCaseSensitiveFileNames); })) {
+                    basePaths.push(includeBasePath);
+                }
+            };
+            // Iterate over each include base path and include unique base paths that are not a
+            // subpath of an existing base path
+            for (var _a = 0, includeBasePaths_1 = includeBasePaths; _a < includeBasePaths_1.length; _a++) {
+                var includeBasePath = includeBasePaths_1[_a];
+                _loop_2(includeBasePath);
+            }
+        }
+        return basePaths;
+    }
+    function getIncludeBasePath(absolute) {
+        var wildcardOffset = ts.indexOfAnyCharCode(absolute, wildcardCharCodes);
+        if (wildcardOffset < 0) {
+            // No "*" or "?" in the path
+            return !hasExtension(absolute)
+                ? absolute
+                : removeTrailingDirectorySeparator(getDirectoryPath(absolute));
+        }
+        return absolute.substring(0, absolute.lastIndexOf(ts.directorySeparator, wildcardOffset));
+    }
+    function ensureScriptKind(fileName, scriptKind) {
+        // Using scriptKind as a condition handles both:
+        // - 'scriptKind' is unspecified and thus it is `undefined`
+        // - 'scriptKind' is set and it is `Unknown` (0)
+        // If the 'scriptKind' is 'undefined' or 'Unknown' then we attempt
+        // to get the ScriptKind from the file name. If it cannot be resolved
+        // from the file name then the default 'TS' script kind is returned.
+        return scriptKind || getScriptKindFromFileName(fileName) || 3 /* TS */;
+    }
+    ts.ensureScriptKind = ensureScriptKind;
+    function getScriptKindFromFileName(fileName) {
+        var ext = fileName.substr(fileName.lastIndexOf("."));
+        switch (ext.toLowerCase()) {
+            case ".js" /* Js */:
+                return 1 /* JS */;
+            case ".jsx" /* Jsx */:
+                return 2 /* JSX */;
+            case ".ts" /* Ts */:
+                return 3 /* TS */;
+            case ".tsx" /* Tsx */:
+                return 4 /* TSX */;
+            case ".json" /* Json */:
+                return 6 /* JSON */;
+            default:
+                return 0 /* Unknown */;
+        }
+    }
+    ts.getScriptKindFromFileName = getScriptKindFromFileName;
+    /**
+     *  List of supported extensions in order of file resolution precedence.
+     */
+    ts.supportedTypeScriptExtensions = [".ts" /* Ts */, ".tsx" /* Tsx */, ".d.ts" /* Dts */];
+    /** Must have ".d.ts" first because if ".ts" goes first, that will be detected as the extension instead of ".d.ts". */
+    ts.supportedTypescriptExtensionsForExtractExtension = [".d.ts" /* Dts */, ".ts" /* Ts */, ".tsx" /* Tsx */];
+    ts.supportedJavascriptExtensions = [".js" /* Js */, ".jsx" /* Jsx */];
+    var allSupportedExtensions = ts.supportedTypeScriptExtensions.concat(ts.supportedJavascriptExtensions);
+    function getSupportedExtensions(options, extraFileExtensions) {
+        var needJsExtensions = options && options.allowJs;
+        if (!extraFileExtensions || extraFileExtensions.length === 0) {
+            return needJsExtensions ? allSupportedExtensions : ts.supportedTypeScriptExtensions;
+        }
+        var extensions = (needJsExtensions ? allSupportedExtensions : ts.supportedTypeScriptExtensions).concat(ts.mapDefined(extraFileExtensions, function (x) { return x.scriptKind === 7 /* Deferred */ || needJsExtensions && isJavaScriptLike(x.scriptKind) ? x.extension : undefined; }));
+        return ts.deduplicate(extensions, ts.equateStringsCaseSensitive, ts.compareStringsCaseSensitive);
+    }
+    ts.getSupportedExtensions = getSupportedExtensions;
+    function isJavaScriptLike(scriptKind) {
+        return scriptKind === 1 /* JS */ || scriptKind === 2 /* JSX */;
+    }
+    function hasJavaScriptFileExtension(fileName) {
+        return ts.some(ts.supportedJavascriptExtensions, function (extension) { return ts.fileExtensionIs(fileName, extension); });
+    }
+    ts.hasJavaScriptFileExtension = hasJavaScriptFileExtension;
+    function hasTypeScriptFileExtension(fileName) {
+        return ts.some(ts.supportedTypeScriptExtensions, function (extension) { return ts.fileExtensionIs(fileName, extension); });
+    }
+    ts.hasTypeScriptFileExtension = hasTypeScriptFileExtension;
+    function isSupportedSourceFileName(fileName, compilerOptions, extraFileExtensions) {
+        if (!fileName) {
+            return false;
+        }
+        for (var _i = 0, _a = getSupportedExtensions(compilerOptions, extraFileExtensions); _i < _a.length; _i++) {
+            var extension = _a[_i];
+            if (ts.fileExtensionIs(fileName, extension)) {
+                return true;
+            }
+        }
+        return false;
+    }
+    ts.isSupportedSourceFileName = isSupportedSourceFileName;
+    /**
+     * Extension boundaries by priority. Lower numbers indicate higher priorities, and are
+     * aligned to the offset of the highest priority extension in the
+     * allSupportedExtensions array.
+     */
+    var ExtensionPriority;
+    (function (ExtensionPriority) {
+        ExtensionPriority[ExtensionPriority["TypeScriptFiles"] = 0] = "TypeScriptFiles";
+        ExtensionPriority[ExtensionPriority["DeclarationAndJavaScriptFiles"] = 2] = "DeclarationAndJavaScriptFiles";
+        ExtensionPriority[ExtensionPriority["Highest"] = 0] = "Highest";
+        ExtensionPriority[ExtensionPriority["Lowest"] = 2] = "Lowest";
+    })(ExtensionPriority = ts.ExtensionPriority || (ts.ExtensionPriority = {}));
+    function getExtensionPriority(path, supportedExtensions) {
+        for (var i = supportedExtensions.length - 1; i >= 0; i--) {
+            if (ts.fileExtensionIs(path, supportedExtensions[i])) {
+                return adjustExtensionPriority(i, supportedExtensions);
+            }
+        }
+        // If its not in the list of supported extensions, this is likely a
+        // TypeScript file with a non-ts extension
+        return 0 /* Highest */;
+    }
+    ts.getExtensionPriority = getExtensionPriority;
+    /**
+     * Adjusts an extension priority to be the highest priority within the same range.
+     */
+    function adjustExtensionPriority(extensionPriority, supportedExtensions) {
+        if (extensionPriority < 2 /* DeclarationAndJavaScriptFiles */) {
+            return 0 /* TypeScriptFiles */;
+        }
+        else if (extensionPriority < supportedExtensions.length) {
+            return 2 /* DeclarationAndJavaScriptFiles */;
+        }
+        else {
+            return supportedExtensions.length;
+        }
+    }
+    ts.adjustExtensionPriority = adjustExtensionPriority;
+    /**
+     * Gets the next lowest extension priority for a given priority.
+     */
+    function getNextLowestExtensionPriority(extensionPriority, supportedExtensions) {
+        if (extensionPriority < 2 /* DeclarationAndJavaScriptFiles */) {
+            return 2 /* DeclarationAndJavaScriptFiles */;
+        }
+        else {
+            return supportedExtensions.length;
+        }
+    }
+    ts.getNextLowestExtensionPriority = getNextLowestExtensionPriority;
+    var extensionsToRemove = [".d.ts" /* Dts */, ".ts" /* Ts */, ".js" /* Js */, ".tsx" /* Tsx */, ".jsx" /* Jsx */, ".json" /* Json */];
+    function removeFileExtension(path) {
+        for (var _i = 0, extensionsToRemove_1 = extensionsToRemove; _i < extensionsToRemove_1.length; _i++) {
+            var ext = extensionsToRemove_1[_i];
+            var extensionless = tryRemoveExtension(path, ext);
+            if (extensionless !== undefined) {
+                return extensionless;
+            }
+        }
+        return path;
+    }
+    ts.removeFileExtension = removeFileExtension;
+    function tryRemoveExtension(path, extension) {
+        return ts.fileExtensionIs(path, extension) ? removeExtension(path, extension) : undefined;
+    }
+    ts.tryRemoveExtension = tryRemoveExtension;
+    function removeExtension(path, extension) {
+        return path.substring(0, path.length - extension.length);
+    }
+    ts.removeExtension = removeExtension;
+    function changeExtension(path, newExtension) {
+        return changeAnyExtension(path, newExtension, extensionsToRemove, /*ignoreCase*/ false);
+    }
+    ts.changeExtension = changeExtension;
+    function changeAnyExtension(path, ext, extensions, ignoreCase) {
+        var pathext = extensions !== undefined && ignoreCase !== undefined ? getAnyExtensionFromPath(path, extensions, ignoreCase) : getAnyExtensionFromPath(path);
+        return pathext ? path.slice(0, path.length - pathext.length) + (ts.startsWith(ext, ".") ? ext : "." + ext) : path;
+    }
+    ts.changeAnyExtension = changeAnyExtension;
+    var Debug;
+    (function (Debug) {
+        function showSymbol(symbol) {
+            var symbolFlags = ts.SymbolFlags;
+            return "{ flags: " + (symbolFlags ? showFlags(symbol.flags, symbolFlags) : symbol.flags) + "; declarations: " + ts.map(symbol.declarations, showSyntaxKind) + " }";
+        }
+        Debug.showSymbol = showSymbol;
+        function showFlags(flags, flagsEnum) {
+            var out = [];
+            for (var pow = 0; pow <= 30; pow++) {
+                var n = 1 << pow;
+                if (flags & n) {
+                    out.push(flagsEnum[n]);
+                }
+            }
+            return out.join("|");
+        }
+        function showSyntaxKind(node) {
+            var syntaxKind = ts.SyntaxKind;
+            return syntaxKind ? syntaxKind[node.kind] : node.kind.toString();
+        }
+        Debug.showSyntaxKind = showSyntaxKind;
+    })(Debug = ts.Debug || (ts.Debug = {}));
+    function tryParsePattern(pattern) {
+        // This should be verified outside of here and a proper error thrown.
+        Debug.assert(hasZeroOrOneAsteriskCharacter(pattern));
+        var indexOfStar = pattern.indexOf("*");
+        return indexOfStar === -1 ? undefined : {
+            prefix: pattern.substr(0, indexOfStar),
+            suffix: pattern.substr(indexOfStar + 1)
+        };
+    }
+    ts.tryParsePattern = tryParsePattern;
+    function positionIsSynthesized(pos) {
+        // This is a fast way of testing the following conditions:
+        //  pos === undefined || pos === null || isNaN(pos) || pos < 0;
+        return !(pos >= 0);
+    }
+    ts.positionIsSynthesized = positionIsSynthesized;
+    /** True if an extension is one of the supported TypeScript extensions. */
+    function extensionIsTypeScript(ext) {
+        return ext === ".ts" /* Ts */ || ext === ".tsx" /* Tsx */ || ext === ".d.ts" /* Dts */;
+    }
+    ts.extensionIsTypeScript = extensionIsTypeScript;
+    function resolutionExtensionIsTypeScriptOrJson(ext) {
+        return extensionIsTypeScript(ext) || ext === ".json" /* Json */;
+    }
+    ts.resolutionExtensionIsTypeScriptOrJson = resolutionExtensionIsTypeScriptOrJson;
+    /**
+     * Gets the extension from a path.
+     * Path must have a valid extension.
+     */
+    function extensionFromPath(path) {
+        var ext = tryGetExtensionFromPath(path);
+        return ext !== undefined ? ext : Debug.fail("File " + path + " has unknown extension.");
+    }
+    ts.extensionFromPath = extensionFromPath;
+    function isAnySupportedFileExtension(path) {
+        return tryGetExtensionFromPath(path) !== undefined;
+    }
+    ts.isAnySupportedFileExtension = isAnySupportedFileExtension;
+    function tryGetExtensionFromPath(path) {
+        return ts.find(ts.supportedTypescriptExtensionsForExtractExtension, function (e) { return ts.fileExtensionIs(path, e); }) || ts.find(ts.supportedJavascriptExtensions, function (e) { return ts.fileExtensionIs(path, e); });
+    }
+    ts.tryGetExtensionFromPath = tryGetExtensionFromPath;
+    function getAnyExtensionFromPathWorker(path, extensions, stringEqualityComparer) {
+        if (typeof extensions === "string")
+            extensions = [extensions];
+        for (var _i = 0, extensions_1 = extensions; _i < extensions_1.length; _i++) {
+            var extension = extensions_1[_i];
+            if (!ts.startsWith(extension, "."))
+                extension = "." + extension;
+            if (path.length >= extension.length && path.charAt(path.length - extension.length) === ".") {
+                var pathExtension = path.slice(path.length - extension.length);
+                if (stringEqualityComparer(pathExtension, extension)) {
+                    return pathExtension;
+                }
+            }
+        }
+        return "";
+    }
+    function getAnyExtensionFromPath(path, extensions, ignoreCase) {
+        // Retrieves any string from the final "." onwards from a base file name.
+        // Unlike extensionFromPath, which throws an exception on unrecognized extensions.
+        if (extensions) {
+            return getAnyExtensionFromPathWorker(path, extensions, ignoreCase ? ts.equateStringsCaseInsensitive : ts.equateStringsCaseSensitive);
+        }
+        var baseFileName = getBaseFileName(path);
+        var extensionIndex = baseFileName.lastIndexOf(".");
+        if (extensionIndex >= 0) {
+            return baseFileName.substring(extensionIndex);
+        }
+        return "";
+    }
+    ts.getAnyExtensionFromPath = getAnyExtensionFromPath;
+    function isCheckJsEnabledForFile(sourceFile, compilerOptions) {
+        return sourceFile.checkJsDirective ? sourceFile.checkJsDirective.enabled : compilerOptions.checkJs;
+    }
+    ts.isCheckJsEnabledForFile = isCheckJsEnabledForFile;
+    ts.emptyFileSystemEntries = {
+        files: ts.emptyArray,
+        directories: ts.emptyArray
+    };
+    /**
+     * patternStrings contains both pattern strings (containing "*") and regular strings.
+     * Return an exact match if possible, or a pattern match, or undefined.
+     * (These are verified by verifyCompilerOptions to have 0 or 1 "*" characters.)
+     */
+    function matchPatternOrExact(patternStrings, candidate) {
+        var patterns = [];
+        for (var _i = 0, patternStrings_1 = patternStrings; _i < patternStrings_1.length; _i++) {
+            var patternString = patternStrings_1[_i];
+            var pattern = tryParsePattern(patternString);
+            if (pattern) {
+                patterns.push(pattern);
+            }
+            else if (patternString === candidate) {
+                // pattern was matched as is - no need to search further
+                return patternString;
+            }
+        }
+        return ts.findBestPatternMatch(patterns, function (_) { return _; }, candidate);
+    }
+    ts.matchPatternOrExact = matchPatternOrExact;
 })(ts || (ts = {}));
 var ts;
 (function (ts) {
@@ -14788,7 +14937,6 @@ var ts;
         SignatureFlags[SignatureFlags["Yield"] = 1] = "Yield";
         SignatureFlags[SignatureFlags["Await"] = 2] = "Await";
         SignatureFlags[SignatureFlags["Type"] = 4] = "Type";
-        SignatureFlags[SignatureFlags["RequireCompleteParameterList"] = 8] = "RequireCompleteParameterList";
         SignatureFlags[SignatureFlags["IgnoreMissingOpenBrace"] = 16] = "IgnoreMissingOpenBrace";
         SignatureFlags[SignatureFlags["JSDoc"] = 32] = "JSDoc";
     })(SignatureFlags || (SignatureFlags = {}));
@@ -15943,8 +16091,8 @@ var ts;
                 kind === 71 /* Identifier */ ? new IdentifierConstructor(kind, p, p) :
                     new TokenConstructor(kind, p, p);
         }
-        function createNodeWithJSDoc(kind) {
-            var node = createNode(kind);
+        function createNodeWithJSDoc(kind, pos) {
+            var node = createNode(kind, pos);
             if (scanner.getTokenFlags() & 2 /* PrecedingJSDocComment */) {
                 addJSDocComment(node);
             }
@@ -16800,6 +16948,23 @@ var ts;
             }
             return finishNode(node);
         }
+        // If true, we should abort parsing an error function.
+        function typeHasArrowFunctionBlockingParseError(node) {
+            switch (node.kind) {
+                case 162 /* TypeReference */:
+                    return ts.nodeIsMissing(node.typeName);
+                case 163 /* FunctionType */:
+                case 164 /* ConstructorType */: {
+                    var _a = node, parameters = _a.parameters, type = _a.type;
+                    // parameters.pos === parameters.end only if we used parseMissingList, else should contain at least `()`
+                    return parameters.pos === parameters.end || typeHasArrowFunctionBlockingParseError(type);
+                }
+                case 173 /* ParenthesizedType */:
+                    return typeHasArrowFunctionBlockingParseError(node.type);
+                default:
+                    return false;
+            }
+        }
         function parseThisTypePredicate(lhs) {
             nextToken();
             var node = createNode(161 /* TypePredicate */, lhs.pos);
@@ -16970,18 +17135,20 @@ var ts;
             return finishNode(node);
         }
         /**
+         * Note: If returnToken is EqualsGreaterThanToken, `signature.type` will always be defined.
          * @returns If return type parsing succeeds
          */
         function fillSignature(returnToken, flags, signature) {
             if (!(flags & 32 /* JSDoc */)) {
                 signature.typeParameters = parseTypeParameters();
             }
-            signature.parameters = parseParameterList(flags); // TODO: GH#18217
+            var parametersParsedSuccessfully = parseParameterList(signature, flags);
             if (shouldParseReturnType(returnToken, !!(flags & 4 /* Type */))) {
                 signature.type = parseTypeOrTypePredicate();
-                return signature.type !== undefined;
+                if (typeHasArrowFunctionBlockingParseError(signature.type))
+                    return false;
             }
-            return true;
+            return parametersParsedSuccessfully;
         }
         function shouldParseReturnType(returnToken, isType) {
             if (returnToken === 36 /* EqualsGreaterThanToken */) {
@@ -16999,7 +17166,8 @@ var ts;
             }
             return false;
         }
-        function parseParameterList(flags) {
+        // Returns true on success.
+        function parseParameterList(signature, flags) {
             // FormalParameters [Yield,Await]: (modified)
             //      [empty]
             //      FormalParameterList[?Yield,Await]
@@ -17013,25 +17181,18 @@ var ts;
             //
             // SingleNameBinding [Yield,Await]:
             //      BindingIdentifier[?Yield,?Await]Initializer [In, ?Yield,?Await] opt
-            if (parseExpected(19 /* OpenParenToken */)) {
-                var savedYieldContext = inYieldContext();
-                var savedAwaitContext = inAwaitContext();
-                setYieldContext(!!(flags & 1 /* Yield */));
-                setAwaitContext(!!(flags & 2 /* Await */));
-                var result = parseDelimitedList(16 /* Parameters */, flags & 32 /* JSDoc */ ? parseJSDocParameter : parseParameter);
-                setYieldContext(savedYieldContext);
-                setAwaitContext(savedAwaitContext);
-                if (!parseExpected(20 /* CloseParenToken */) && (flags & 8 /* RequireCompleteParameterList */)) {
-                    // Caller insisted that we had to end with a )   We didn't.  So just return
-                    // undefined here.
-                    return undefined;
-                }
-                return result;
+            if (!parseExpected(19 /* OpenParenToken */)) {
+                signature.parameters = createMissingList();
+                return false;
             }
-            // We didn't even have an open paren.  If the caller requires a complete parameter list,
-            // we definitely can't provide that.  However, if they're ok with an incomplete one,
-            // then just return an empty set of parameters.
-            return (flags & 8 /* RequireCompleteParameterList */) ? undefined : createMissingList();
+            var savedYieldContext = inYieldContext();
+            var savedAwaitContext = inAwaitContext();
+            setYieldContext(!!(flags & 1 /* Yield */));
+            setAwaitContext(!!(flags & 2 /* Await */));
+            signature.parameters = parseDelimitedList(16 /* Parameters */, flags & 32 /* JSDoc */ ? parseJSDocParameter : parseParameter);
+            setYieldContext(savedYieldContext);
+            setAwaitContext(savedAwaitContext);
+            return parseExpected(20 /* CloseParenToken */);
         }
         function parseTypeMemberSemicolon() {
             // We allow type members to be separated by commas or (possibly ASI) semicolons.
@@ -17260,23 +17421,14 @@ var ts;
             var node = createNode(173 /* ParenthesizedType */);
             parseExpected(19 /* OpenParenToken */);
             node.type = parseType();
-            if (!node.type) {
-                return undefined; // TODO: GH#18217
-            }
             parseExpected(20 /* CloseParenToken */);
             return finishNode(node);
         }
-        function parseFunctionOrConstructorType(kind) {
-            var node = createNodeWithJSDoc(kind);
-            if (kind === 164 /* ConstructorType */) {
-                parseExpected(94 /* NewKeyword */);
-            }
-            if (!fillSignature(36 /* EqualsGreaterThanToken */, 4 /* Type */ | (sourceFile.languageVariant === 1 /* JSX */ ? 8 /* RequireCompleteParameterList */ : 0), node)) {
-                return undefined;
-            }
-            if (!node.parameters) {
-                return undefined;
-            }
+        function parseFunctionOrConstructorType() {
+            var pos = getNodePos();
+            var kind = parseOptional(94 /* NewKeyword */) ? 164 /* ConstructorType */ : 163 /* FunctionType */;
+            var node = createNodeWithJSDoc(kind, pos);
+            fillSignature(36 /* EqualsGreaterThanToken */, 4 /* Type */, node);
             return finishNode(node);
         }
         function parseKeywordAndNoDot() {
@@ -17594,11 +17746,8 @@ var ts;
             return doOutsideOfContext(20480 /* TypeExcludesFlags */, parseTypeWorker);
         }
         function parseTypeWorker(noConditionalTypes) {
-            if (isStartOfFunctionType()) {
-                return parseFunctionOrConstructorType(163 /* FunctionType */); // TODO: GH#18217
-            }
-            if (token() === 94 /* NewKeyword */) {
-                return parseFunctionOrConstructorType(164 /* ConstructorType */);
+            if (isStartOfFunctionType() || token() === 94 /* NewKeyword */) {
+                return parseFunctionOrConstructorType();
             }
             var type = parseUnionTypeOrHigher();
             if (!noConditionalTypes && !scanner.hasPrecedingLineBreak() && parseOptional(85 /* ExtendsKeyword */)) {
@@ -18029,11 +18178,7 @@ var ts;
             // a => (b => c)
             // And think that "(b =>" was actually a parenthesized arrow function with a missing
             // close paren.
-            if (!fillSignature(56 /* ColonToken */, isAsync | (allowAmbiguity ? 0 /* None */ : 8 /* RequireCompleteParameterList */), node)) {
-                return undefined;
-            }
-            // If we couldn't get parameters, we definitely could not parse out an arrow function.
-            if (!node.parameters) {
+            if (!fillSignature(56 /* ColonToken */, isAsync, node) && !allowAmbiguity) {
                 return undefined;
             }
             // Parsing a signature isn't enough.
@@ -20581,51 +20726,39 @@ var ts;
                     nextJSDocToken();
                     var tagName = parseJSDocIdentifierName();
                     skipWhitespace();
-                    if (!tagName) {
-                        return;
-                    }
                     var tag;
-                    if (tagName) {
-                        switch (tagName.escapedText) {
-                            case "augments":
-                            case "extends":
-                                tag = parseAugmentsTag(atToken, tagName);
-                                break;
-                            case "class":
-                            case "constructor":
-                                tag = parseClassTag(atToken, tagName);
-                                break;
-                            case "arg":
-                            case "argument":
-                            case "param":
-                                return parseParameterOrPropertyTag(atToken, tagName, 2 /* Parameter */, indent);
-                            case "return":
-                            case "returns":
-                                tag = parseReturnTag(atToken, tagName);
-                                break;
-                            case "template":
-                                tag = parseTemplateTag(atToken, tagName);
-                                break;
-                            case "type":
-                                tag = parseTypeTag(atToken, tagName);
-                                break;
-                            case "typedef":
-                                tag = parseTypedefTag(atToken, tagName, indent);
-                                break;
-                            case "callback":
-                                tag = parseCallbackTag(atToken, tagName, indent);
-                                break;
-                            default:
-                                tag = parseUnknownTag(atToken, tagName);
-                                break;
-                        }
-                    }
-                    else {
-                        tag = parseUnknownTag(atToken, tagName);
-                    }
-                    if (!tag) {
-                        // a badly malformed tag should not be added to the list of tags
-                        return;
+                    switch (tagName.escapedText) {
+                        case "augments":
+                        case "extends":
+                            tag = parseAugmentsTag(atToken, tagName);
+                            break;
+                        case "class":
+                        case "constructor":
+                            tag = parseClassTag(atToken, tagName);
+                            break;
+                        case "arg":
+                        case "argument":
+                        case "param":
+                            return parseParameterOrPropertyTag(atToken, tagName, 2 /* Parameter */, indent);
+                        case "return":
+                        case "returns":
+                            tag = parseReturnTag(atToken, tagName);
+                            break;
+                        case "template":
+                            tag = parseTemplateTag(atToken, tagName);
+                            break;
+                        case "type":
+                            tag = parseTypeTag(atToken, tagName);
+                            break;
+                        case "typedef":
+                            tag = parseTypedefTag(atToken, tagName, indent);
+                            break;
+                        case "callback":
+                            tag = parseCallbackTag(atToken, tagName, indent);
+                            break;
+                        default:
+                            tag = parseUnknownTag(atToken, tagName);
+                            break;
                     }
                     if (!tag.comment) {
                         // some tags, like typedef and callback, have already parsed their comments earlier
@@ -20835,11 +20968,11 @@ var ts;
                     return res;
                 }
                 function parsePropertyAccessEntityNameExpression() {
-                    var node = parseJSDocIdentifierName(/*createIfMissing*/ true);
+                    var node = parseJSDocIdentifierName();
                     while (parseOptional(23 /* DotToken */)) {
                         var prop = createNode(185 /* PropertyAccessExpression */, node.pos);
                         prop.expression = node;
-                        prop.name = parseJSDocIdentifierName(); // TODO: GH#18217
+                        prop.name = parseJSDocIdentifierName();
                         node = finishNode(prop);
                     }
                     return node;
@@ -20898,8 +21031,11 @@ var ts;
                 }
                 function parseJSDocTypeNameWithNamespace(nested) {
                     var pos = scanner.getTokenPos();
+                    if (!ts.tokenIsIdentifierOrKeyword(token())) {
+                        return undefined;
+                    }
                     var typeNameOrNamespaceName = parseJSDocIdentifierName();
-                    if (typeNameOrNamespaceName && parseOptional(23 /* DotToken */)) {
+                    if (parseOptional(23 /* DotToken */)) {
                         var jsDocNamespaceNode = createNode(239 /* ModuleDeclaration */, pos);
                         if (nested) {
                             jsDocNamespaceNode.flags |= 4 /* NestedNamespace */;
@@ -20908,7 +21044,7 @@ var ts;
                         jsDocNamespaceNode.body = parseJSDocTypeNameWithNamespace(/*nested*/ true);
                         return finishNode(jsDocNamespaceNode);
                     }
-                    if (typeNameOrNamespaceName && nested) {
+                    if (nested) {
                         typeNameOrNamespaceName.isInJSDocNamespace = true;
                     }
                     return typeNameOrNamespaceName;
@@ -21010,9 +21146,6 @@ var ts;
                     nextJSDocToken();
                     var tagName = parseJSDocIdentifierName();
                     skipWhitespace();
-                    if (!tagName) {
-                        return false;
-                    }
                     var t;
                     switch (tagName.escapedText) {
                         case "type":
@@ -21047,11 +21180,7 @@ var ts;
                     do {
                         skipWhitespace();
                         var typeParameter = createNode(148 /* TypeParameter */);
-                        if (!ts.tokenIsIdentifierOrKeyword(token())) {
-                            parseErrorAtCurrentToken(ts.Diagnostics.Unexpected_token_A_type_parameter_name_was_expected_without_curly_braces);
-                            return undefined;
-                        }
-                        typeParameter.name = parseJSDocIdentifierName();
+                        typeParameter.name = parseJSDocIdentifierName(ts.Diagnostics.Unexpected_token_A_type_parameter_name_was_expected_without_curly_braces);
                         skipWhitespace();
                         finishNode(typeParameter);
                         typeParameters.push(typeParameter);
@@ -21077,7 +21206,7 @@ var ts;
                     return false;
                 }
                 function parseJSDocEntityName() {
-                    var entity = parseJSDocIdentifierName(/*createIfMissing*/ true);
+                    var entity = parseJSDocIdentifierName();
                     if (parseOptional(21 /* OpenBracketToken */)) {
                         parseExpected(22 /* CloseBracketToken */);
                         // Note that y[] is accepted as an entity name, but the postfix brackets are not saved for checking.
@@ -21085,7 +21214,7 @@ var ts;
                         // but it's not worth it to enforce that restriction.
                     }
                     while (parseOptional(23 /* DotToken */)) {
-                        var name = parseJSDocIdentifierName(/*createIfMissing*/ true);
+                        var name = parseJSDocIdentifierName();
                         if (parseOptional(21 /* OpenBracketToken */)) {
                             parseExpected(22 /* CloseBracketToken */);
                         }
@@ -21093,16 +21222,9 @@ var ts;
                     }
                     return entity;
                 }
-                function parseJSDocIdentifierName(createIfMissing) {
-                    if (createIfMissing === void 0) { createIfMissing = false; }
+                function parseJSDocIdentifierName(message) {
                     if (!ts.tokenIsIdentifierOrKeyword(token())) {
-                        if (createIfMissing) {
-                            return createMissingNode(71 /* Identifier */, /*reportAtCurrentPosition*/ true, ts.Diagnostics.Identifier_expected);
-                        }
-                        else {
-                            parseErrorAtCurrentToken(ts.Diagnostics.Identifier_expected);
-                            return undefined;
-                        }
+                        return createMissingNode(71 /* Identifier */, /*reportAtCurrentPosition*/ !message, message || ts.Diagnostics.Identifier_expected);
                     }
                     var pos = scanner.getTokenPos();
                     var end = scanner.getTextPos();
@@ -21224,8 +21346,8 @@ var ts;
                 array._children = undefined;
                 array.pos += delta;
                 array.end += delta;
-                for (var _i = 0, array_8 = array; _i < array_8.length; _i++) {
-                    var node = array_8[_i];
+                for (var _i = 0, array_1 = array; _i < array_1.length; _i++) {
+                    var node = array_1[_i];
                     visitNode(node);
                 }
             }
@@ -21375,8 +21497,8 @@ var ts;
                     array._children = undefined;
                     // Adjust the pos or end (or both) of the intersecting array accordingly.
                     adjustIntersectingElement(array, changeStart, changeRangeOldEnd, changeRangeNewEnd, delta);
-                    for (var _i = 0, array_9 = array; _i < array_9.length; _i++) {
-                        var node = array_9[_i];
+                    for (var _i = 0, array_2 = array; _i < array_2.length; _i++) {
+                        var node = array_2[_i];
                         visitNode(node);
                     }
                     return;
@@ -21639,6 +21761,7 @@ var ts;
         context.checkJsDirective = undefined;
         context.referencedFiles = [];
         context.typeReferenceDirectives = [];
+        context.libReferenceDirectives = [];
         context.amdDependencies = [];
         context.hasNoDefaultLib = false;
         context.pragmas.forEach(function (entryOrList, key) {
@@ -21648,6 +21771,7 @@ var ts;
                 case "reference": {
                     var referencedFiles_1 = context.referencedFiles;
                     var typeReferenceDirectives_1 = context.typeReferenceDirectives;
+                    var libReferenceDirectives_1 = context.libReferenceDirectives;
                     ts.forEach(ts.toArray(entryOrList), function (arg) {
                         // TODO: GH#18217
                         if (arg.arguments["no-default-lib"]) {
@@ -21656,6 +21780,9 @@ var ts;
                         else if (arg.arguments.types) {
                             typeReferenceDirectives_1.push({ pos: arg.arguments.types.pos, end: arg.arguments.types.end, fileName: arg.arguments.types.value });
                         }
+                        else if (arg.arguments.lib) {
+                            libReferenceDirectives_1.push({ pos: arg.arguments.lib.pos, end: arg.arguments.lib.end, fileName: arg.arguments.lib.value });
+                        }
                         else if (arg.arguments.path) {
                             referencedFiles_1.push({ pos: arg.arguments.path.pos, end: arg.arguments.path.end, fileName: arg.arguments.path.value });
                         }
@@ -21819,6 +21946,3408 @@ var ts;
     }
     ts.tagNamesAreEquivalent = tagNamesAreEquivalent;
 })(ts || (ts = {}));
+var ts;
+(function (ts) {
+    /* @internal */
+    ts.compileOnSaveCommandLineOption = { name: "compileOnSave", type: "boolean" };
+    // NOTE: The order here is important to default lib ordering as entries will have the same
+    //       order in the generated program (see `getDefaultLibPriority` in program.ts). This
+    //       order also affects overload resolution when a type declared in one lib is
+    //       augmented in another lib.
+    var libEntries = [
+        // JavaScript only
+        ["es5", "lib.es5.d.ts"],
+        ["es6", "lib.es2015.d.ts"],
+        ["es2015", "lib.es2015.d.ts"],
+        ["es7", "lib.es2016.d.ts"],
+        ["es2016", "lib.es2016.d.ts"],
+        ["es2017", "lib.es2017.d.ts"],
+        ["es2018", "lib.es2018.d.ts"],
+        ["esnext", "lib.esnext.d.ts"],
+        // Host only
+        ["dom", "lib.dom.d.ts"],
+        ["dom.iterable", "lib.dom.iterable.d.ts"],
+        ["webworker", "lib.webworker.d.ts"],
+        ["webworker.importscripts", "lib.webworker.importscripts.d.ts"],
+        ["scripthost", "lib.scripthost.d.ts"],
+        // ES2015 Or ESNext By-feature options
+        ["es2015.core", "lib.es2015.core.d.ts"],
+        ["es2015.collection", "lib.es2015.collection.d.ts"],
+        ["es2015.generator", "lib.es2015.generator.d.ts"],
+        ["es2015.iterable", "lib.es2015.iterable.d.ts"],
+        ["es2015.promise", "lib.es2015.promise.d.ts"],
+        ["es2015.proxy", "lib.es2015.proxy.d.ts"],
+        ["es2015.reflect", "lib.es2015.reflect.d.ts"],
+        ["es2015.symbol", "lib.es2015.symbol.d.ts"],
+        ["es2015.symbol.wellknown", "lib.es2015.symbol.wellknown.d.ts"],
+        ["es2016.array.include", "lib.es2016.array.include.d.ts"],
+        ["es2017.object", "lib.es2017.object.d.ts"],
+        ["es2017.sharedmemory", "lib.es2017.sharedmemory.d.ts"],
+        ["es2017.string", "lib.es2017.string.d.ts"],
+        ["es2017.intl", "lib.es2017.intl.d.ts"],
+        ["es2017.typedarrays", "lib.es2017.typedarrays.d.ts"],
+        ["es2018.intl", "lib.es2018.intl.d.ts"],
+        ["es2018.promise", "lib.es2018.promise.d.ts"],
+        ["es2018.regexp", "lib.es2018.regexp.d.ts"],
+        ["esnext.array", "lib.esnext.array.d.ts"],
+        ["esnext.symbol", "lib.esnext.symbol.d.ts"],
+        ["esnext.asynciterable", "lib.esnext.asynciterable.d.ts"],
+    ];
+    /**
+     * An array of supported "lib" reference file names used to determine the order for inclusion
+     * when referenced, as well as for spelling suggestions. This ensures the correct ordering for
+     * overload resolution when a type declared in one lib is extended by another.
+     */
+    /* @internal */
+    ts.libs = libEntries.map(function (entry) { return entry[0]; });
+    /**
+     * A map of lib names to lib files. This map is used both for parsing the "lib" command line
+     * option as well as for resolving lib reference directives.
+     */
+    /* @internal */
+    ts.libMap = ts.createMapFromEntries(libEntries);
+    /* @internal */
+    ts.optionDeclarations = [
+        // CommandLine only options
+        {
+            name: "help",
+            shortName: "h",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Command_line_Options,
+            description: ts.Diagnostics.Print_this_message,
+        },
+        {
+            name: "help",
+            shortName: "?",
+            type: "boolean"
+        },
+        {
+            name: "all",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Command_line_Options,
+            description: ts.Diagnostics.Show_all_compiler_options,
+        },
+        {
+            name: "version",
+            shortName: "v",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Command_line_Options,
+            description: ts.Diagnostics.Print_the_compiler_s_version,
+        },
+        {
+            name: "init",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Command_line_Options,
+            description: ts.Diagnostics.Initializes_a_TypeScript_project_and_creates_a_tsconfig_json_file,
+        },
+        {
+            name: "project",
+            shortName: "p",
+            type: "string",
+            isFilePath: true,
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Command_line_Options,
+            paramType: ts.Diagnostics.FILE_OR_DIRECTORY,
+            description: ts.Diagnostics.Compile_the_project_given_the_path_to_its_configuration_file_or_to_a_folder_with_a_tsconfig_json,
+        },
+        {
+            name: "build",
+            type: "boolean",
+            shortName: "b",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Command_line_Options,
+            description: ts.Diagnostics.Build_one_or_more_projects_and_their_dependencies_if_out_of_date
+        },
+        {
+            name: "pretty",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Command_line_Options,
+            description: ts.Diagnostics.Stylize_errors_and_messages_using_color_and_context_experimental
+        },
+        {
+            name: "preserveWatchOutput",
+            type: "boolean",
+            showInSimplifiedHelpView: false,
+            category: ts.Diagnostics.Command_line_Options,
+            description: ts.Diagnostics.Whether_to_keep_outdated_console_output_in_watch_mode_instead_of_clearing_the_screen,
+        },
+        {
+            name: "watch",
+            shortName: "w",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Command_line_Options,
+            description: ts.Diagnostics.Watch_input_files,
+        },
+        // Basic
+        {
+            name: "target",
+            shortName: "t",
+            type: ts.createMapFromTemplate({
+                es3: 0 /* ES3 */,
+                es5: 1 /* ES5 */,
+                es6: 2 /* ES2015 */,
+                es2015: 2 /* ES2015 */,
+                es2016: 3 /* ES2016 */,
+                es2017: 4 /* ES2017 */,
+                es2018: 5 /* ES2018 */,
+                esnext: 6 /* ESNext */,
+            }),
+            paramType: ts.Diagnostics.VERSION,
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Specify_ECMAScript_target_version_Colon_ES3_default_ES5_ES2015_ES2016_ES2017_ES2018_or_ESNEXT,
+        },
+        {
+            name: "module",
+            shortName: "m",
+            type: ts.createMapFromTemplate({
+                none: ts.ModuleKind.None,
+                commonjs: ts.ModuleKind.CommonJS,
+                amd: ts.ModuleKind.AMD,
+                system: ts.ModuleKind.System,
+                umd: ts.ModuleKind.UMD,
+                es6: ts.ModuleKind.ES2015,
+                es2015: ts.ModuleKind.ES2015,
+                esnext: ts.ModuleKind.ESNext
+            }),
+            paramType: ts.Diagnostics.KIND,
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Specify_module_code_generation_Colon_none_commonjs_amd_system_umd_es2015_or_ESNext,
+        },
+        {
+            name: "lib",
+            type: "list",
+            element: {
+                name: "lib",
+                type: ts.libMap
+            },
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Specify_library_files_to_be_included_in_the_compilation
+        },
+        {
+            name: "allowJs",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Allow_javascript_files_to_be_compiled
+        },
+        {
+            name: "checkJs",
+            type: "boolean",
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Report_errors_in_js_files
+        },
+        {
+            name: "jsx",
+            type: ts.createMapFromTemplate({
+                "preserve": 1 /* Preserve */,
+                "react-native": 3 /* ReactNative */,
+                "react": 2 /* React */
+            }),
+            paramType: ts.Diagnostics.KIND,
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Specify_JSX_code_generation_Colon_preserve_react_native_or_react,
+        },
+        {
+            name: "declaration",
+            shortName: "d",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Generates_corresponding_d_ts_file,
+        },
+        {
+            name: "declarationMap",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Generates_a_sourcemap_for_each_corresponding_d_ts_file,
+        },
+        {
+            name: "emitDeclarationOnly",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Only_emit_d_ts_declaration_files,
+        },
+        {
+            name: "sourceMap",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Generates_corresponding_map_file,
+        },
+        {
+            name: "outFile",
+            type: "string",
+            isFilePath: true,
+            paramType: ts.Diagnostics.FILE,
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Concatenate_and_emit_output_to_single_file,
+        },
+        {
+            name: "outDir",
+            type: "string",
+            isFilePath: true,
+            paramType: ts.Diagnostics.DIRECTORY,
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Redirect_output_structure_to_the_directory,
+        },
+        {
+            name: "rootDir",
+            type: "string",
+            isFilePath: true,
+            paramType: ts.Diagnostics.LOCATION,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Specify_the_root_directory_of_input_files_Use_to_control_the_output_directory_structure_with_outDir,
+        },
+        {
+            name: "composite",
+            type: "boolean",
+            isTSConfigOnly: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Enable_project_compilation,
+        },
+        {
+            name: "removeComments",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Do_not_emit_comments_to_output,
+        },
+        {
+            name: "noEmit",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Do_not_emit_outputs,
+        },
+        {
+            name: "importHelpers",
+            type: "boolean",
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Import_emit_helpers_from_tslib
+        },
+        {
+            name: "downlevelIteration",
+            type: "boolean",
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Provide_full_support_for_iterables_in_for_of_spread_and_destructuring_when_targeting_ES5_or_ES3
+        },
+        {
+            name: "isolatedModules",
+            type: "boolean",
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Transpile_each_file_as_a_separate_module_similar_to_ts_transpileModule
+        },
+        // Strict Type Checks
+        {
+            name: "strict",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Strict_Type_Checking_Options,
+            description: ts.Diagnostics.Enable_all_strict_type_checking_options
+        },
+        {
+            name: "noImplicitAny",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Strict_Type_Checking_Options,
+            description: ts.Diagnostics.Raise_error_on_expressions_and_declarations_with_an_implied_any_type,
+        },
+        {
+            name: "strictNullChecks",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Strict_Type_Checking_Options,
+            description: ts.Diagnostics.Enable_strict_null_checks
+        },
+        {
+            name: "strictFunctionTypes",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Strict_Type_Checking_Options,
+            description: ts.Diagnostics.Enable_strict_checking_of_function_types
+        },
+        {
+            name: "strictPropertyInitialization",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Strict_Type_Checking_Options,
+            description: ts.Diagnostics.Enable_strict_checking_of_property_initialization_in_classes
+        },
+        {
+            name: "noImplicitThis",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Strict_Type_Checking_Options,
+            description: ts.Diagnostics.Raise_error_on_this_expressions_with_an_implied_any_type,
+        },
+        {
+            name: "alwaysStrict",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Strict_Type_Checking_Options,
+            description: ts.Diagnostics.Parse_in_strict_mode_and_emit_use_strict_for_each_source_file
+        },
+        // Additional Checks
+        {
+            name: "noUnusedLocals",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Additional_Checks,
+            description: ts.Diagnostics.Report_errors_on_unused_locals,
+        },
+        {
+            name: "noUnusedParameters",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Additional_Checks,
+            description: ts.Diagnostics.Report_errors_on_unused_parameters,
+        },
+        {
+            name: "noImplicitReturns",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Additional_Checks,
+            description: ts.Diagnostics.Report_error_when_not_all_code_paths_in_function_return_a_value
+        },
+        {
+            name: "noFallthroughCasesInSwitch",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Additional_Checks,
+            description: ts.Diagnostics.Report_errors_for_fallthrough_cases_in_switch_statement
+        },
+        // Module Resolution
+        {
+            name: "moduleResolution",
+            type: ts.createMapFromTemplate({
+                node: ts.ModuleResolutionKind.NodeJs,
+                classic: ts.ModuleResolutionKind.Classic,
+            }),
+            paramType: ts.Diagnostics.STRATEGY,
+            category: ts.Diagnostics.Module_Resolution_Options,
+            description: ts.Diagnostics.Specify_module_resolution_strategy_Colon_node_Node_js_or_classic_TypeScript_pre_1_6,
+        },
+        {
+            name: "baseUrl",
+            type: "string",
+            isFilePath: true,
+            category: ts.Diagnostics.Module_Resolution_Options,
+            description: ts.Diagnostics.Base_directory_to_resolve_non_absolute_module_names
+        },
+        {
+            // this option can only be specified in tsconfig.json
+            // use type = object to copy the value as-is
+            name: "paths",
+            type: "object",
+            isTSConfigOnly: true,
+            category: ts.Diagnostics.Module_Resolution_Options,
+            description: ts.Diagnostics.A_series_of_entries_which_re_map_imports_to_lookup_locations_relative_to_the_baseUrl
+        },
+        {
+            // this option can only be specified in tsconfig.json
+            // use type = object to copy the value as-is
+            name: "rootDirs",
+            type: "list",
+            isTSConfigOnly: true,
+            element: {
+                name: "rootDirs",
+                type: "string",
+                isFilePath: true
+            },
+            category: ts.Diagnostics.Module_Resolution_Options,
+            description: ts.Diagnostics.List_of_root_folders_whose_combined_content_represents_the_structure_of_the_project_at_runtime
+        },
+        {
+            name: "typeRoots",
+            type: "list",
+            element: {
+                name: "typeRoots",
+                type: "string",
+                isFilePath: true
+            },
+            category: ts.Diagnostics.Module_Resolution_Options,
+            description: ts.Diagnostics.List_of_folders_to_include_type_definitions_from
+        },
+        {
+            name: "types",
+            type: "list",
+            element: {
+                name: "types",
+                type: "string"
+            },
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Module_Resolution_Options,
+            description: ts.Diagnostics.Type_declaration_files_to_be_included_in_compilation
+        },
+        {
+            name: "allowSyntheticDefaultImports",
+            type: "boolean",
+            category: ts.Diagnostics.Module_Resolution_Options,
+            description: ts.Diagnostics.Allow_default_imports_from_modules_with_no_default_export_This_does_not_affect_code_emit_just_typechecking
+        },
+        {
+            name: "esModuleInterop",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Module_Resolution_Options,
+            description: ts.Diagnostics.Enables_emit_interoperability_between_CommonJS_and_ES_Modules_via_creation_of_namespace_objects_for_all_imports_Implies_allowSyntheticDefaultImports
+        },
+        {
+            name: "preserveSymlinks",
+            type: "boolean",
+            category: ts.Diagnostics.Module_Resolution_Options,
+            description: ts.Diagnostics.Do_not_resolve_the_real_path_of_symlinks,
+        },
+        // Source Maps
+        {
+            name: "sourceRoot",
+            type: "string",
+            isFilePath: true,
+            paramType: ts.Diagnostics.LOCATION,
+            category: ts.Diagnostics.Source_Map_Options,
+            description: ts.Diagnostics.Specify_the_location_where_debugger_should_locate_TypeScript_files_instead_of_source_locations,
+        },
+        {
+            name: "mapRoot",
+            type: "string",
+            isFilePath: true,
+            paramType: ts.Diagnostics.LOCATION,
+            category: ts.Diagnostics.Source_Map_Options,
+            description: ts.Diagnostics.Specify_the_location_where_debugger_should_locate_map_files_instead_of_generated_locations,
+        },
+        {
+            name: "inlineSourceMap",
+            type: "boolean",
+            category: ts.Diagnostics.Source_Map_Options,
+            description: ts.Diagnostics.Emit_a_single_file_with_source_maps_instead_of_having_a_separate_file
+        },
+        {
+            name: "inlineSources",
+            type: "boolean",
+            category: ts.Diagnostics.Source_Map_Options,
+            description: ts.Diagnostics.Emit_the_source_alongside_the_sourcemaps_within_a_single_file_requires_inlineSourceMap_or_sourceMap_to_be_set
+        },
+        // Experimental
+        {
+            name: "experimentalDecorators",
+            type: "boolean",
+            category: ts.Diagnostics.Experimental_Options,
+            description: ts.Diagnostics.Enables_experimental_support_for_ES7_decorators
+        },
+        {
+            name: "emitDecoratorMetadata",
+            type: "boolean",
+            category: ts.Diagnostics.Experimental_Options,
+            description: ts.Diagnostics.Enables_experimental_support_for_emitting_type_metadata_for_decorators
+        },
+        // Advanced
+        {
+            name: "jsxFactory",
+            type: "string",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Specify_the_JSX_factory_function_to_use_when_targeting_react_JSX_emit_e_g_React_createElement_or_h
+        },
+        {
+            name: "diagnostics",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Show_diagnostic_information
+        },
+        {
+            name: "extendedDiagnostics",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Show_verbose_diagnostic_information
+        },
+        {
+            name: "traceResolution",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Enable_tracing_of_the_name_resolution_process
+        },
+        {
+            name: "resolveJsonModule",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Include_modules_imported_with_json_extension
+        },
+        {
+            name: "listFiles",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Print_names_of_files_part_of_the_compilation
+        },
+        {
+            name: "listEmittedFiles",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Print_names_of_generated_files_part_of_the_compilation
+        },
+        {
+            name: "out",
+            type: "string",
+            isFilePath: false,
+            // for correct behaviour, please use outFile
+            category: ts.Diagnostics.Advanced_Options,
+            paramType: ts.Diagnostics.FILE,
+            description: ts.Diagnostics.Deprecated_Use_outFile_instead_Concatenate_and_emit_output_to_single_file,
+        },
+        {
+            name: "reactNamespace",
+            type: "string",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Deprecated_Use_jsxFactory_instead_Specify_the_object_invoked_for_createElement_when_targeting_react_JSX_emit
+        },
+        {
+            name: "skipDefaultLibCheck",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Deprecated_Use_skipLibCheck_instead_Skip_type_checking_of_default_library_declaration_files
+        },
+        {
+            name: "charset",
+            type: "string",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.The_character_set_of_the_input_files
+        },
+        {
+            name: "emitBOM",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Emit_a_UTF_8_Byte_Order_Mark_BOM_in_the_beginning_of_output_files
+        },
+        {
+            name: "locale",
+            type: "string",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.The_locale_used_when_displaying_messages_to_the_user_e_g_en_us
+        },
+        {
+            name: "newLine",
+            type: ts.createMapFromTemplate({
+                crlf: 0 /* CarriageReturnLineFeed */,
+                lf: 1 /* LineFeed */
+            }),
+            paramType: ts.Diagnostics.NEWLINE,
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Specify_the_end_of_line_sequence_to_be_used_when_emitting_files_Colon_CRLF_dos_or_LF_unix,
+        },
+        {
+            name: "noErrorTruncation",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Do_not_truncate_error_messages
+        },
+        {
+            name: "noLib",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Do_not_include_the_default_library_file_lib_d_ts
+        },
+        {
+            name: "noResolve",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Do_not_add_triple_slash_references_or_imported_modules_to_the_list_of_compiled_files
+        },
+        {
+            name: "stripInternal",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Do_not_emit_declarations_for_code_that_has_an_internal_annotation,
+        },
+        {
+            name: "disableSizeLimit",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Disable_size_limitations_on_JavaScript_projects
+        },
+        {
+            name: "noImplicitUseStrict",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Do_not_emit_use_strict_directives_in_module_output
+        },
+        {
+            name: "noEmitHelpers",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Do_not_generate_custom_helper_functions_like_extends_in_compiled_output
+        },
+        {
+            name: "noEmitOnError",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Do_not_emit_outputs_if_any_errors_were_reported,
+        },
+        {
+            name: "preserveConstEnums",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Do_not_erase_const_enum_declarations_in_generated_code
+        },
+        {
+            name: "declarationDir",
+            type: "string",
+            isFilePath: true,
+            paramType: ts.Diagnostics.DIRECTORY,
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Output_directory_for_generated_declaration_files
+        },
+        {
+            name: "skipLibCheck",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Skip_type_checking_of_declaration_files,
+        },
+        {
+            name: "allowUnusedLabels",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Do_not_report_errors_on_unused_labels
+        },
+        {
+            name: "allowUnreachableCode",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Do_not_report_errors_on_unreachable_code
+        },
+        {
+            name: "suppressExcessPropertyErrors",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Suppress_excess_property_checks_for_object_literals,
+        },
+        {
+            name: "suppressImplicitAnyIndexErrors",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Suppress_noImplicitAny_errors_for_indexing_objects_lacking_index_signatures,
+        },
+        {
+            name: "forceConsistentCasingInFileNames",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Disallow_inconsistently_cased_references_to_the_same_file
+        },
+        {
+            name: "maxNodeModuleJsDepth",
+            type: "number",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.The_maximum_dependency_depth_to_search_under_node_modules_and_load_JavaScript_files
+        },
+        {
+            name: "noStrictGenericChecks",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Disable_strict_checking_of_generic_signatures_in_function_types,
+        },
+        {
+            name: "keyofStringsOnly",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Resolve_keyof_to_string_valued_property_names_only_no_numbers_or_symbols,
+        },
+        {
+            // A list of plugins to load in the language service
+            name: "plugins",
+            type: "list",
+            isTSConfigOnly: true,
+            element: {
+                name: "plugin",
+                type: "object"
+            },
+            description: ts.Diagnostics.List_of_language_service_plugins
+        }
+    ];
+    /* @internal */
+    ts.typeAcquisitionDeclarations = [
+        {
+            /* @deprecated typingOptions.enableAutoDiscovery
+             * Use typeAcquisition.enable instead.
+             */
+            name: "enableAutoDiscovery",
+            type: "boolean",
+        },
+        {
+            name: "enable",
+            type: "boolean",
+        },
+        {
+            name: "include",
+            type: "list",
+            element: {
+                name: "include",
+                type: "string"
+            }
+        },
+        {
+            name: "exclude",
+            type: "list",
+            element: {
+                name: "exclude",
+                type: "string"
+            }
+        }
+    ];
+    /* @internal */
+    ts.defaultInitCompilerOptions = {
+        module: ts.ModuleKind.CommonJS,
+        target: 1 /* ES5 */,
+        strict: true,
+        esModuleInterop: true
+    };
+    var optionNameMapCache;
+    /* @internal */
+    function convertEnableAutoDiscoveryToEnable(typeAcquisition) {
+        // Convert deprecated typingOptions.enableAutoDiscovery to typeAcquisition.enable
+        if (typeAcquisition && typeAcquisition.enableAutoDiscovery !== undefined && typeAcquisition.enable === undefined) {
+            return {
+                enable: typeAcquisition.enableAutoDiscovery,
+                include: typeAcquisition.include || [],
+                exclude: typeAcquisition.exclude || []
+            };
+        }
+        return typeAcquisition;
+    }
+    ts.convertEnableAutoDiscoveryToEnable = convertEnableAutoDiscoveryToEnable;
+    function getOptionNameMap() {
+        if (optionNameMapCache) {
+            return optionNameMapCache;
+        }
+        var optionNameMap = ts.createMap();
+        var shortOptionNames = ts.createMap();
+        ts.forEach(ts.optionDeclarations, function (option) {
+            optionNameMap.set(option.name.toLowerCase(), option);
+            if (option.shortName) {
+                shortOptionNames.set(option.shortName, option.name);
+            }
+        });
+        optionNameMapCache = { optionNameMap: optionNameMap, shortOptionNames: shortOptionNames };
+        return optionNameMapCache;
+    }
+    /* @internal */
+    function createCompilerDiagnosticForInvalidCustomType(opt) {
+        return createDiagnosticForInvalidCustomType(opt, ts.createCompilerDiagnostic);
+    }
+    ts.createCompilerDiagnosticForInvalidCustomType = createCompilerDiagnosticForInvalidCustomType;
+    function createDiagnosticForInvalidCustomType(opt, createDiagnostic) {
+        var namesOfType = ts.arrayFrom(opt.type.keys()).map(function (key) { return "'" + key + "'"; }).join(", ");
+        return createDiagnostic(ts.Diagnostics.Argument_for_0_option_must_be_Colon_1, "--" + opt.name, namesOfType);
+    }
+    /* @internal */
+    function parseCustomTypeOption(opt, value, errors) {
+        return convertJsonOptionOfCustomType(opt, trimString(value || ""), errors);
+    }
+    ts.parseCustomTypeOption = parseCustomTypeOption;
+    /* @internal */
+    function parseListTypeOption(opt, value, errors) {
+        if (value === void 0) { value = ""; }
+        value = trimString(value);
+        if (ts.startsWith(value, "-")) {
+            return undefined;
+        }
+        if (value === "") {
+            return [];
+        }
+        var values = value.split(",");
+        switch (opt.element.type) {
+            case "number":
+                return ts.map(values, parseInt);
+            case "string":
+                return ts.map(values, function (v) { return v || ""; });
+            default:
+                return ts.mapDefined(values, function (v) { return parseCustomTypeOption(opt.element, v, errors); });
+        }
+    }
+    ts.parseListTypeOption = parseListTypeOption;
+    function parseCommandLine(commandLine, readFile) {
+        var options = {};
+        var fileNames = [];
+        var projectReferences = undefined;
+        var errors = [];
+        parseStrings(commandLine);
+        return {
+            options: options,
+            fileNames: fileNames,
+            projectReferences: projectReferences,
+            errors: errors
+        };
+        function parseStrings(args) {
+            var i = 0;
+            while (i < args.length) {
+                var s = args[i];
+                i++;
+                if (s.charCodeAt(0) === 64 /* at */) {
+                    parseResponseFile(s.slice(1));
+                }
+                else if (s.charCodeAt(0) === 45 /* minus */) {
+                    var opt = getOptionFromName(s.slice(s.charCodeAt(1) === 45 /* minus */ ? 2 : 1), /*allowShort*/ true);
+                    if (opt) {
+                        if (opt.isTSConfigOnly) {
+                            errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Option_0_can_only_be_specified_in_tsconfig_json_file, opt.name));
+                        }
+                        else {
+                            // Check to see if no argument was provided (e.g. "--locale" is the last command-line argument).
+                            if (!args[i] && opt.type !== "boolean") {
+                                errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Compiler_option_0_expects_an_argument, opt.name));
+                            }
+                            switch (opt.type) {
+                                case "number":
+                                    options[opt.name] = parseInt(args[i]);
+                                    i++;
+                                    break;
+                                case "boolean":
+                                    // boolean flag has optional value true, false, others
+                                    var optValue = args[i];
+                                    options[opt.name] = optValue !== "false";
+                                    // consume next argument as boolean flag value
+                                    if (optValue === "false" || optValue === "true") {
+                                        i++;
+                                    }
+                                    break;
+                                case "string":
+                                    options[opt.name] = args[i] || "";
+                                    i++;
+                                    break;
+                                case "list":
+                                    var result = parseListTypeOption(opt, args[i], errors);
+                                    options[opt.name] = result || [];
+                                    if (result) {
+                                        i++;
+                                    }
+                                    break;
+                                // If not a primitive, the possible types are specified in what is effectively a map of options.
+                                default:
+                                    options[opt.name] = parseCustomTypeOption(opt, args[i], errors);
+                                    i++;
+                                    break;
+                            }
+                        }
+                    }
+                    else {
+                        errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Unknown_compiler_option_0, s));
+                    }
+                }
+                else {
+                    fileNames.push(s);
+                }
+            }
+        }
+        function parseResponseFile(fileName) {
+            var text = readFile ? readFile(fileName) : ts.sys.readFile(fileName);
+            if (!text) {
+                errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.File_0_not_found, fileName));
+                return;
+            }
+            var args = [];
+            var pos = 0;
+            while (true) {
+                while (pos < text.length && text.charCodeAt(pos) <= 32 /* space */)
+                    pos++;
+                if (pos >= text.length)
+                    break;
+                var start = pos;
+                if (text.charCodeAt(start) === 34 /* doubleQuote */) {
+                    pos++;
+                    while (pos < text.length && text.charCodeAt(pos) !== 34 /* doubleQuote */)
+                        pos++;
+                    if (pos < text.length) {
+                        args.push(text.substring(start + 1, pos));
+                        pos++;
+                    }
+                    else {
+                        errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Unterminated_quoted_string_in_response_file_0, fileName));
+                    }
+                }
+                else {
+                    while (text.charCodeAt(pos) > 32 /* space */)
+                        pos++;
+                    args.push(text.substring(start, pos));
+                }
+            }
+            parseStrings(args);
+        }
+    }
+    ts.parseCommandLine = parseCommandLine;
+    /** @internal */
+    function getOptionFromName(optionName, allowShort) {
+        if (allowShort === void 0) { allowShort = false; }
+        optionName = optionName.toLowerCase();
+        var _a = getOptionNameMap(), optionNameMap = _a.optionNameMap, shortOptionNames = _a.shortOptionNames;
+        // Try to translate short option names to their full equivalents.
+        if (allowShort) {
+            var short = shortOptionNames.get(optionName);
+            if (short !== undefined) {
+                optionName = short;
+            }
+        }
+        return optionNameMap.get(optionName);
+    }
+    ts.getOptionFromName = getOptionFromName;
+    function getDiagnosticText(_message) {
+        var _args = [];
+        for (var _i = 1; _i < arguments.length; _i++) {
+            _args[_i - 1] = arguments[_i];
+        }
+        var diagnostic = ts.createCompilerDiagnostic.apply(undefined, arguments);
+        return diagnostic.messageText;
+    }
+    /* @internal */
+    function printVersion() {
+        ts.sys.write(getDiagnosticText(ts.Diagnostics.Version_0, ts.version) + ts.sys.newLine);
+    }
+    ts.printVersion = printVersion;
+    /* @internal */
+    function printHelp(optionsList, syntaxPrefix) {
+        if (syntaxPrefix === void 0) { syntaxPrefix = ""; }
+        var output = [];
+        // We want to align our "syntax" and "examples" commands to a certain margin.
+        var syntaxLength = getDiagnosticText(ts.Diagnostics.Syntax_Colon_0, "").length;
+        var examplesLength = getDiagnosticText(ts.Diagnostics.Examples_Colon_0, "").length;
+        var marginLength = Math.max(syntaxLength, examplesLength);
+        // Build up the syntactic skeleton.
+        var syntax = makePadding(marginLength - syntaxLength);
+        syntax += "tsc " + syntaxPrefix + "[" + getDiagnosticText(ts.Diagnostics.options) + "] [" + getDiagnosticText(ts.Diagnostics.file) + "...]";
+        output.push(getDiagnosticText(ts.Diagnostics.Syntax_Colon_0, syntax));
+        output.push(ts.sys.newLine + ts.sys.newLine);
+        // Build up the list of examples.
+        var padding = makePadding(marginLength);
+        output.push(getDiagnosticText(ts.Diagnostics.Examples_Colon_0, makePadding(marginLength - examplesLength) + "tsc hello.ts") + ts.sys.newLine);
+        output.push(padding + "tsc --outFile file.js file.ts" + ts.sys.newLine);
+        output.push(padding + "tsc @args.txt" + ts.sys.newLine);
+        output.push(padding + "tsc --build tsconfig.json" + ts.sys.newLine);
+        output.push(ts.sys.newLine);
+        output.push(getDiagnosticText(ts.Diagnostics.Options_Colon) + ts.sys.newLine);
+        // We want our descriptions to align at the same column in our output,
+        // so we keep track of the longest option usage string.
+        marginLength = 0;
+        var usageColumn = []; // Things like "-d, --declaration" go in here.
+        var descriptionColumn = [];
+        var optionsDescriptionMap = ts.createMap(); // Map between option.description and list of option.type if it is a kind
+        for (var _i = 0, optionsList_1 = optionsList; _i < optionsList_1.length; _i++) {
+            var option = optionsList_1[_i];
+            // If an option lacks a description,
+            // it is not officially supported.
+            if (!option.description) {
+                continue;
+            }
+            var usageText_1 = " ";
+            if (option.shortName) {
+                usageText_1 += "-" + option.shortName;
+                usageText_1 += getParamType(option);
+                usageText_1 += ", ";
+            }
+            usageText_1 += "--" + option.name;
+            usageText_1 += getParamType(option);
+            usageColumn.push(usageText_1);
+            var description = void 0;
+            if (option.name === "lib") {
+                description = getDiagnosticText(option.description);
+                var element = option.element;
+                var typeMap = element.type;
+                optionsDescriptionMap.set(description, ts.arrayFrom(typeMap.keys()).map(function (key) { return "'" + key + "'"; }));
+            }
+            else {
+                description = getDiagnosticText(option.description);
+            }
+            descriptionColumn.push(description);
+            // Set the new margin for the description column if necessary.
+            marginLength = Math.max(usageText_1.length, marginLength);
+        }
+        // Special case that can't fit in the loop.
+        var usageText = " @<" + getDiagnosticText(ts.Diagnostics.file) + ">";
+        usageColumn.push(usageText);
+        descriptionColumn.push(getDiagnosticText(ts.Diagnostics.Insert_command_line_options_and_files_from_a_file));
+        marginLength = Math.max(usageText.length, marginLength);
+        // Print out each row, aligning all the descriptions on the same column.
+        for (var i = 0; i < usageColumn.length; i++) {
+            var usage = usageColumn[i];
+            var description = descriptionColumn[i];
+            var kindsList = optionsDescriptionMap.get(description);
+            output.push(usage + makePadding(marginLength - usage.length + 2) + description + ts.sys.newLine);
+            if (kindsList) {
+                output.push(makePadding(marginLength + 4));
+                for (var _a = 0, kindsList_1 = kindsList; _a < kindsList_1.length; _a++) {
+                    var kind = kindsList_1[_a];
+                    output.push(kind + " ");
+                }
+                output.push(ts.sys.newLine);
+            }
+        }
+        for (var _b = 0, output_1 = output; _b < output_1.length; _b++) {
+            var line = output_1[_b];
+            ts.sys.write(line);
+        }
+        return;
+        function getParamType(option) {
+            if (option.paramType !== undefined) {
+                return " " + getDiagnosticText(option.paramType);
+            }
+            return "";
+        }
+        function makePadding(paddingLength) {
+            return Array(paddingLength + 1).join(" ");
+        }
+    }
+    ts.printHelp = printHelp;
+    /**
+     * Reads the config file, reports errors if any and exits if the config file cannot be found
+     */
+    function getParsedCommandLineOfConfigFile(configFileName, optionsToExtend, host) {
+        var configFileText;
+        try {
+            configFileText = host.readFile(configFileName);
+        }
+        catch (e) {
+            var error = ts.createCompilerDiagnostic(ts.Diagnostics.Cannot_read_file_0_Colon_1, configFileName, e.message);
+            host.onUnRecoverableConfigFileDiagnostic(error);
+            return undefined;
+        }
+        if (!configFileText) {
+            var error = ts.createCompilerDiagnostic(ts.Diagnostics.File_0_not_found, configFileName);
+            host.onUnRecoverableConfigFileDiagnostic(error);
+            return undefined;
+        }
+        var result = ts.parseJsonText(configFileName, configFileText);
+        var cwd = host.getCurrentDirectory();
+        return parseJsonSourceFileConfigFileContent(result, host, ts.getNormalizedAbsolutePath(ts.getDirectoryPath(configFileName), cwd), optionsToExtend, ts.getNormalizedAbsolutePath(configFileName, cwd));
+    }
+    ts.getParsedCommandLineOfConfigFile = getParsedCommandLineOfConfigFile;
+    /**
+     * Read tsconfig.json file
+     * @param fileName The path to the config file
+     */
+    function readConfigFile(fileName, readFile) {
+        var textOrDiagnostic = tryReadFile(fileName, readFile);
+        return ts.isString(textOrDiagnostic) ? parseConfigFileTextToJson(fileName, textOrDiagnostic) : { config: {}, error: textOrDiagnostic };
+    }
+    ts.readConfigFile = readConfigFile;
+    /**
+     * Parse the text of the tsconfig.json file
+     * @param fileName The path to the config file
+     * @param jsonText The text of the config file
+     */
+    function parseConfigFileTextToJson(fileName, jsonText) {
+        var jsonSourceFile = ts.parseJsonText(fileName, jsonText);
+        return {
+            config: convertToObject(jsonSourceFile, jsonSourceFile.parseDiagnostics),
+            error: jsonSourceFile.parseDiagnostics.length ? jsonSourceFile.parseDiagnostics[0] : undefined
+        };
+    }
+    ts.parseConfigFileTextToJson = parseConfigFileTextToJson;
+    /**
+     * Read tsconfig.json file
+     * @param fileName The path to the config file
+     */
+    function readJsonConfigFile(fileName, readFile) {
+        var textOrDiagnostic = tryReadFile(fileName, readFile);
+        return ts.isString(textOrDiagnostic) ? ts.parseJsonText(fileName, textOrDiagnostic) : { parseDiagnostics: [textOrDiagnostic] };
+    }
+    ts.readJsonConfigFile = readJsonConfigFile;
+    function tryReadFile(fileName, readFile) {
+        var text;
+        try {
+            text = readFile(fileName);
+        }
+        catch (e) {
+            return ts.createCompilerDiagnostic(ts.Diagnostics.Cannot_read_file_0_Colon_1, fileName, e.message);
+        }
+        return text === undefined ? ts.createCompilerDiagnostic(ts.Diagnostics.The_specified_path_does_not_exist_Colon_0, fileName) : text;
+    }
+    function commandLineOptionsToMap(options) {
+        return ts.arrayToMap(options, function (option) { return option.name; });
+    }
+    var _tsconfigRootOptions;
+    function getTsconfigRootOptionsMap() {
+        if (_tsconfigRootOptions === undefined) {
+            _tsconfigRootOptions = {
+                name: undefined,
+                type: "object",
+                elementOptions: commandLineOptionsToMap([
+                    {
+                        name: "compilerOptions",
+                        type: "object",
+                        elementOptions: commandLineOptionsToMap(ts.optionDeclarations),
+                        extraKeyDiagnosticMessage: ts.Diagnostics.Unknown_compiler_option_0
+                    },
+                    {
+                        name: "typingOptions",
+                        type: "object",
+                        elementOptions: commandLineOptionsToMap(ts.typeAcquisitionDeclarations),
+                        extraKeyDiagnosticMessage: ts.Diagnostics.Unknown_type_acquisition_option_0
+                    },
+                    {
+                        name: "typeAcquisition",
+                        type: "object",
+                        elementOptions: commandLineOptionsToMap(ts.typeAcquisitionDeclarations),
+                        extraKeyDiagnosticMessage: ts.Diagnostics.Unknown_type_acquisition_option_0
+                    },
+                    {
+                        name: "extends",
+                        type: "string"
+                    },
+                    {
+                        name: "references",
+                        type: "list",
+                        element: {
+                            name: "references",
+                            type: "object"
+                        }
+                    },
+                    {
+                        name: "files",
+                        type: "list",
+                        element: {
+                            name: "files",
+                            type: "string"
+                        }
+                    },
+                    {
+                        name: "include",
+                        type: "list",
+                        element: {
+                            name: "include",
+                            type: "string"
+                        }
+                    },
+                    {
+                        name: "exclude",
+                        type: "list",
+                        element: {
+                            name: "exclude",
+                            type: "string"
+                        }
+                    },
+                    ts.compileOnSaveCommandLineOption
+                ])
+            };
+        }
+        return _tsconfigRootOptions;
+    }
+    /**
+     * Convert the json syntax tree into the json value
+     */
+    function convertToObject(sourceFile, errors) {
+        return convertToObjectWorker(sourceFile, errors, /*returnValue*/ true, /*knownRootOptions*/ undefined, /*jsonConversionNotifier*/ undefined);
+    }
+    ts.convertToObject = convertToObject;
+    /**
+     * Convert the json syntax tree into the json value and report errors
+     * This returns the json value (apart from checking errors) only if returnValue provided is true.
+     * Otherwise it just checks the errors and returns undefined
+     */
+    /*@internal*/
+    function convertToObjectWorker(sourceFile, errors, returnValue, knownRootOptions, jsonConversionNotifier) {
+        if (!sourceFile.statements.length) {
+            return returnValue ? {} : undefined;
+        }
+        return convertPropertyValueToJson(sourceFile.statements[0].expression, knownRootOptions);
+        function isRootOptionMap(knownOptions) {
+            return knownRootOptions && knownRootOptions.elementOptions === knownOptions;
+        }
+        function convertObjectLiteralExpressionToJson(node, knownOptions, extraKeyDiagnosticMessage, parentOption) {
+            var result = returnValue ? {} : undefined;
+            for (var _i = 0, _a = node.properties; _i < _a.length; _i++) {
+                var element = _a[_i];
+                if (element.kind !== 270 /* PropertyAssignment */) {
+                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, element, ts.Diagnostics.Property_assignment_expected));
+                    continue;
+                }
+                if (element.questionToken) {
+                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, element.questionToken, ts.Diagnostics._0_can_only_be_used_in_a_ts_file, "?"));
+                }
+                if (!isDoubleQuotedString(element.name)) {
+                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, element.name, ts.Diagnostics.String_literal_with_double_quotes_expected));
+                }
+                var keyText = ts.unescapeLeadingUnderscores(ts.getTextOfPropertyName(element.name));
+                var option = knownOptions ? knownOptions.get(keyText) : undefined;
+                if (extraKeyDiagnosticMessage && !option) {
+                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, element.name, extraKeyDiagnosticMessage, keyText));
+                }
+                var value = convertPropertyValueToJson(element.initializer, option);
+                if (typeof keyText !== "undefined") {
+                    if (returnValue) {
+                        result[keyText] = value;
+                    }
+                    // Notify key value set, if user asked for it
+                    if (jsonConversionNotifier &&
+                        // Current callbacks are only on known parent option or if we are setting values in the root
+                        (parentOption || isRootOptionMap(knownOptions))) {
+                        var isValidOptionValue = isCompilerOptionsValue(option, value);
+                        if (parentOption) {
+                            if (isValidOptionValue) {
+                                // Notify option set in the parent if its a valid option value
+                                jsonConversionNotifier.onSetValidOptionKeyValueInParent(parentOption, option, value);
+                            }
+                        }
+                        else if (isRootOptionMap(knownOptions)) {
+                            if (isValidOptionValue) {
+                                // Notify about the valid root key value being set
+                                jsonConversionNotifier.onSetValidOptionKeyValueInRoot(keyText, element.name, value, element.initializer);
+                            }
+                            else if (!option) {
+                                // Notify about the unknown root key value being set
+                                jsonConversionNotifier.onSetUnknownOptionKeyValueInRoot(keyText, element.name, value, element.initializer);
+                            }
+                        }
+                    }
+                }
+            }
+            return result;
+        }
+        function convertArrayLiteralExpressionToJson(elements, elementOption) {
+            return (returnValue ? elements.map : elements.forEach).call(elements, function (element) { return convertPropertyValueToJson(element, elementOption); });
+        }
+        function convertPropertyValueToJson(valueExpression, option) {
+            switch (valueExpression.kind) {
+                case 101 /* TrueKeyword */:
+                    reportInvalidOptionValue(option && option.type !== "boolean");
+                    return true;
+                case 86 /* FalseKeyword */:
+                    reportInvalidOptionValue(option && option.type !== "boolean");
+                    return false;
+                case 95 /* NullKeyword */:
+                    reportInvalidOptionValue(option && option.name === "extends"); // "extends" is the only option we don't allow null/undefined for
+                    return null; // tslint:disable-line:no-null-keyword
+                case 9 /* StringLiteral */:
+                    if (!isDoubleQuotedString(valueExpression)) {
+                        errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, valueExpression, ts.Diagnostics.String_literal_with_double_quotes_expected));
+                    }
+                    reportInvalidOptionValue(option && (ts.isString(option.type) && option.type !== "string"));
+                    var text = valueExpression.text;
+                    if (option && !ts.isString(option.type)) {
+                        var customOption = option;
+                        // Validate custom option type
+                        if (!customOption.type.has(text.toLowerCase())) {
+                            errors.push(createDiagnosticForInvalidCustomType(customOption, function (message, arg0, arg1) { return ts.createDiagnosticForNodeInSourceFile(sourceFile, valueExpression, message, arg0, arg1); }));
+                        }
+                    }
+                    return text;
+                case 8 /* NumericLiteral */:
+                    reportInvalidOptionValue(option && option.type !== "number");
+                    return Number(valueExpression.text);
+                case 198 /* PrefixUnaryExpression */:
+                    if (valueExpression.operator !== 38 /* MinusToken */ || valueExpression.operand.kind !== 8 /* NumericLiteral */) {
+                        break; // not valid JSON syntax
+                    }
+                    reportInvalidOptionValue(option && option.type !== "number");
+                    return -Number(valueExpression.operand.text);
+                case 184 /* ObjectLiteralExpression */:
+                    reportInvalidOptionValue(option && option.type !== "object");
+                    var objectLiteralExpression = valueExpression;
+                    // Currently having element option declaration in the tsconfig with type "object"
+                    // determines if it needs onSetValidOptionKeyValueInParent callback or not
+                    // At moment there are only "compilerOptions", "typeAcquisition" and "typingOptions"
+                    // that satifies it and need it to modify options set in them (for normalizing file paths)
+                    // vs what we set in the json
+                    // If need arises, we can modify this interface and callbacks as needed
+                    if (option) {
+                        var _a = option, elementOptions = _a.elementOptions, extraKeyDiagnosticMessage = _a.extraKeyDiagnosticMessage, optionName = _a.name;
+                        return convertObjectLiteralExpressionToJson(objectLiteralExpression, elementOptions, extraKeyDiagnosticMessage, optionName);
+                    }
+                    else {
+                        return convertObjectLiteralExpressionToJson(objectLiteralExpression, /* knownOptions*/ undefined, 
+                        /*extraKeyDiagnosticMessage */ undefined, /*parentOption*/ undefined);
+                    }
+                case 183 /* ArrayLiteralExpression */:
+                    reportInvalidOptionValue(option && option.type !== "list");
+                    return convertArrayLiteralExpressionToJson(valueExpression.elements, option && option.element);
+            }
+            // Not in expected format
+            if (option) {
+                reportInvalidOptionValue(/*isError*/ true);
+            }
+            else {
+                errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, valueExpression, ts.Diagnostics.Property_value_can_only_be_string_literal_numeric_literal_true_false_null_object_literal_or_array_literal));
+            }
+            return undefined;
+            function reportInvalidOptionValue(isError) {
+                if (isError) {
+                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, valueExpression, ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, option.name, getCompilerOptionValueTypeString(option)));
+                }
+            }
+        }
+        function isDoubleQuotedString(node) {
+            return ts.isStringLiteral(node) && ts.isStringDoubleQuoted(node, sourceFile);
+        }
+    }
+    ts.convertToObjectWorker = convertToObjectWorker;
+    function getCompilerOptionValueTypeString(option) {
+        return option.type === "list" ?
+            "Array" :
+            ts.isString(option.type) ? option.type : "string";
+    }
+    function isCompilerOptionsValue(option, value) {
+        if (option) {
+            if (isNullOrUndefined(value))
+                return true; // All options are undefinable/nullable
+            if (option.type === "list") {
+                return ts.isArray(value);
+            }
+            var expectedType = ts.isString(option.type) ? option.type : "string";
+            return typeof value === expectedType;
+        }
+        return false;
+    }
+    /**
+     * Generate tsconfig configuration when running command line "--init"
+     * @param options commandlineOptions to be generated into tsconfig.json
+     * @param fileNames array of filenames to be generated into tsconfig.json
+     */
+    /* @internal */
+    function generateTSConfig(options, fileNames, newLine) {
+        var compilerOptions = ts.extend(options, ts.defaultInitCompilerOptions);
+        var compilerOptionsMap = serializeCompilerOptions(compilerOptions);
+        return writeConfigurations();
+        function getCustomTypeMapOfCommandLineOption(optionDefinition) {
+            if (optionDefinition.type === "string" || optionDefinition.type === "number" || optionDefinition.type === "boolean") {
+                // this is of a type CommandLineOptionOfPrimitiveType
+                return undefined;
+            }
+            else if (optionDefinition.type === "list") {
+                return getCustomTypeMapOfCommandLineOption(optionDefinition.element);
+            }
+            else {
+                return optionDefinition.type;
+            }
+        }
+        function getNameOfCompilerOptionValue(value, customTypeMap) {
+            // There is a typeMap associated with this command-line option so use it to map value back to its name
+            return ts.forEachEntry(customTypeMap, function (mapValue, key) {
+                if (mapValue === value) {
+                    return key;
+                }
+            });
+        }
+        function serializeCompilerOptions(options) {
+            var result = ts.createMap();
+            var optionsNameMap = getOptionNameMap().optionNameMap;
+            var _loop_3 = function (name) {
+                if (ts.hasProperty(options, name)) {
+                    // tsconfig only options cannot be specified via command line,
+                    // so we can assume that only types that can appear here string | number | boolean
+                    if (optionsNameMap.has(name) && optionsNameMap.get(name).category === ts.Diagnostics.Command_line_Options) {
+                        return "continue";
+                    }
+                    var value = options[name];
+                    var optionDefinition = optionsNameMap.get(name.toLowerCase());
+                    if (optionDefinition) {
+                        var customTypeMap_1 = getCustomTypeMapOfCommandLineOption(optionDefinition);
+                        if (!customTypeMap_1) {
+                            // There is no map associated with this compiler option then use the value as-is
+                            // This is the case if the value is expect to be string, number, boolean or list of string
+                            result.set(name, value);
+                        }
+                        else {
+                            if (optionDefinition.type === "list") {
+                                result.set(name, value.map(function (element) { return getNameOfCompilerOptionValue(element, customTypeMap_1); })); // TODO: GH#18217
+                            }
+                            else {
+                                // There is a typeMap associated with this command-line option so use it to map value back to its name
+                                result.set(name, getNameOfCompilerOptionValue(value, customTypeMap_1));
+                            }
+                        }
+                    }
+                }
+            };
+            for (var name in options) {
+                _loop_3(name);
+            }
+            return result;
+        }
+        function getDefaultValueForOption(option) {
+            switch (option.type) {
+                case "number":
+                    return 1;
+                case "boolean":
+                    return true;
+                case "string":
+                    return option.isFilePath ? "./" : "";
+                case "list":
+                    return [];
+                case "object":
+                    return {};
+                default:
+                    return option.type.keys().next().value;
+            }
+        }
+        function makePadding(paddingLength) {
+            return Array(paddingLength + 1).join(" ");
+        }
+        function isAllowedOption(_a) {
+            var category = _a.category, name = _a.name;
+            // Skip options which do not have a category or have category `Command_line_Options`
+            // Exclude all possible `Advanced_Options` in tsconfig.json which were NOT defined in command line
+            return category !== undefined
+                && category !== ts.Diagnostics.Command_line_Options
+                && (category !== ts.Diagnostics.Advanced_Options || compilerOptionsMap.has(name));
+        }
+        function writeConfigurations() {
+            // Filter applicable options to place in the file
+            var categorizedOptions = ts.createMultiMap();
+            for (var _i = 0, optionDeclarations_1 = ts.optionDeclarations; _i < optionDeclarations_1.length; _i++) {
+                var option = optionDeclarations_1[_i];
+                var category = option.category;
+                if (isAllowedOption(option)) {
+                    categorizedOptions.add(ts.getLocaleSpecificMessage(category), option);
+                }
+            }
+            // Serialize all options and their descriptions
+            var marginLength = 0;
+            var seenKnownKeys = 0;
+            var nameColumn = [];
+            var descriptionColumn = [];
+            categorizedOptions.forEach(function (options, category) {
+                if (nameColumn.length !== 0) {
+                    nameColumn.push("");
+                    descriptionColumn.push("");
+                }
+                nameColumn.push("/* " + category + " */");
+                descriptionColumn.push("");
+                for (var _i = 0, options_1 = options; _i < options_1.length; _i++) {
+                    var option = options_1[_i];
+                    var optionName = void 0;
+                    if (compilerOptionsMap.has(option.name)) {
+                        optionName = "\"" + option.name + "\": " + JSON.stringify(compilerOptionsMap.get(option.name)) + ((seenKnownKeys += 1) === compilerOptionsMap.size ? "" : ",");
+                    }
+                    else {
+                        optionName = "// \"" + option.name + "\": " + JSON.stringify(getDefaultValueForOption(option)) + ",";
+                    }
+                    nameColumn.push(optionName);
+                    descriptionColumn.push("/* " + (option.description && ts.getLocaleSpecificMessage(option.description) || option.name) + " */");
+                    marginLength = Math.max(optionName.length, marginLength);
+                }
+            });
+            // Write the output
+            var tab = makePadding(2);
+            var result = [];
+            result.push("{");
+            result.push(tab + "\"compilerOptions\": {");
+            // Print out each row, aligning all the descriptions on the same column.
+            for (var i = 0; i < nameColumn.length; i++) {
+                var optionName = nameColumn[i];
+                var description = descriptionColumn[i];
+                result.push(optionName && "" + tab + tab + optionName + (description && (makePadding(marginLength - optionName.length + 2) + description)));
+            }
+            if (fileNames.length) {
+                result.push(tab + "},");
+                result.push(tab + "\"files\": [");
+                for (var i = 0; i < fileNames.length; i++) {
+                    result.push("" + tab + tab + JSON.stringify(fileNames[i]) + (i === fileNames.length - 1 ? "" : ","));
+                }
+                result.push(tab + "]");
+            }
+            else {
+                result.push(tab + "}");
+            }
+            result.push("}");
+            return result.join(newLine);
+        }
+    }
+    ts.generateTSConfig = generateTSConfig;
+    /**
+     * Parse the contents of a config file (tsconfig.json).
+     * @param json The contents of the config file to parse
+     * @param host Instance of ParseConfigHost used to enumerate files in folder.
+     * @param basePath A root directory to resolve relative path entries in the config
+     *    file to. e.g. outDir
+     */
+    function parseJsonConfigFileContent(json, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions) {
+        return parseJsonConfigFileContentWorker(json, /*sourceFile*/ undefined, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions);
+    }
+    ts.parseJsonConfigFileContent = parseJsonConfigFileContent;
+    /**
+     * Parse the contents of a config file (tsconfig.json).
+     * @param jsonNode The contents of the config file to parse
+     * @param host Instance of ParseConfigHost used to enumerate files in folder.
+     * @param basePath A root directory to resolve relative path entries in the config
+     *    file to. e.g. outDir
+     */
+    function parseJsonSourceFileConfigFileContent(sourceFile, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions) {
+        return parseJsonConfigFileContentWorker(/*json*/ undefined, sourceFile, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions);
+    }
+    ts.parseJsonSourceFileConfigFileContent = parseJsonSourceFileConfigFileContent;
+    /*@internal*/
+    function setConfigFileInOptions(options, configFile) {
+        if (configFile) {
+            Object.defineProperty(options, "configFile", { enumerable: false, writable: false, value: configFile });
+        }
+    }
+    ts.setConfigFileInOptions = setConfigFileInOptions;
+    function isNullOrUndefined(x) {
+        // tslint:disable-next-line:no-null-keyword
+        return x === undefined || x === null;
+    }
+    function directoryOfCombinedPath(fileName, basePath) {
+        // Use the `getNormalizedAbsolutePath` function to avoid canonicalizing the path, as it must remain noncanonical
+        // until consistient casing errors are reported
+        return ts.getDirectoryPath(ts.getNormalizedAbsolutePath(fileName, basePath));
+    }
+    /**
+     * Parse the contents of a config file from json or json source file (tsconfig.json).
+     * @param json The contents of the config file to parse
+     * @param sourceFile sourceFile corresponding to the Json
+     * @param host Instance of ParseConfigHost used to enumerate files in folder.
+     * @param basePath A root directory to resolve relative path entries in the config
+     *    file to. e.g. outDir
+     * @param resolutionStack Only present for backwards-compatibility. Should be empty.
+     */
+    function parseJsonConfigFileContentWorker(json, sourceFile, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions) {
+        if (existingOptions === void 0) { existingOptions = {}; }
+        if (resolutionStack === void 0) { resolutionStack = []; }
+        if (extraFileExtensions === void 0) { extraFileExtensions = []; }
+        ts.Debug.assert((json === undefined && sourceFile !== undefined) || (json !== undefined && sourceFile === undefined));
+        var errors = [];
+        var parsedConfig = parseConfig(json, sourceFile, host, basePath, configFileName, resolutionStack, errors);
+        var raw = parsedConfig.raw;
+        var options = ts.extend(existingOptions, parsedConfig.options || {});
+        options.configFilePath = configFileName && ts.normalizeSlashes(configFileName);
+        setConfigFileInOptions(options, sourceFile);
+        var _a = getFileNames(), fileNames = _a.fileNames, wildcardDirectories = _a.wildcardDirectories, spec = _a.spec, projectReferences = _a.projectReferences;
+        return {
+            options: options,
+            fileNames: fileNames,
+            projectReferences: projectReferences,
+            typeAcquisition: parsedConfig.typeAcquisition || getDefaultTypeAcquisition(),
+            raw: raw,
+            errors: errors,
+            wildcardDirectories: wildcardDirectories,
+            compileOnSave: !!raw.compileOnSave,
+            configFileSpecs: spec
+        };
+        function getFileNames() {
+            var filesSpecs;
+            if (ts.hasProperty(raw, "files") && !isNullOrUndefined(raw.files)) {
+                if (ts.isArray(raw.files)) {
+                    filesSpecs = raw.files;
+                    if (filesSpecs.length === 0) {
+                        createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.The_files_list_in_config_file_0_is_empty, configFileName || "tsconfig.json");
+                    }
+                }
+                else {
+                    createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "files", "Array");
+                }
+            }
+            var includeSpecs;
+            if (ts.hasProperty(raw, "include") && !isNullOrUndefined(raw.include)) {
+                if (ts.isArray(raw.include)) {
+                    includeSpecs = raw.include;
+                }
+                else {
+                    createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "include", "Array");
+                }
+            }
+            var excludeSpecs;
+            if (ts.hasProperty(raw, "exclude") && !isNullOrUndefined(raw.exclude)) {
+                if (ts.isArray(raw.exclude)) {
+                    excludeSpecs = raw.exclude;
+                }
+                else {
+                    createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "exclude", "Array");
+                }
+            }
+            else if (raw.compilerOptions) {
+                var outDir = raw.compilerOptions.outDir;
+                var declarationDir = raw.compilerOptions.declarationDir;
+                if (outDir || declarationDir) {
+                    excludeSpecs = [outDir, declarationDir].filter(function (d) { return !!d; });
+                }
+            }
+            if (filesSpecs === undefined && includeSpecs === undefined) {
+                includeSpecs = ["**/*"];
+            }
+            var result = matchFileNames(filesSpecs, includeSpecs, excludeSpecs, configFileName ? directoryOfCombinedPath(configFileName, basePath) : basePath, options, host, errors, extraFileExtensions, sourceFile);
+            if (result.fileNames.length === 0 && !ts.hasProperty(raw, "files") && resolutionStack.length === 0 && !ts.hasProperty(raw, "references")) {
+                errors.push(getErrorForNoInputFiles(result.spec, configFileName));
+            }
+            if (ts.hasProperty(raw, "references") && !isNullOrUndefined(raw.references)) {
+                if (ts.isArray(raw.references)) {
+                    var references = [];
+                    for (var _i = 0, _a = raw.references; _i < _a.length; _i++) {
+                        var ref = _a[_i];
+                        if (typeof ref.path !== "string") {
+                            createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "reference.path", "string");
+                        }
+                        else {
+                            references.push({
+                                path: ts.getNormalizedAbsolutePath(ref.path, basePath),
+                                originalPath: ref.path,
+                                prepend: ref.prepend,
+                                circular: ref.circular
+                            });
+                        }
+                    }
+                    result.projectReferences = references;
+                }
+                else {
+                    createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "references", "Array");
+                }
+            }
+            return result;
+        }
+        function createCompilerDiagnosticOnlyIfJson(message, arg0, arg1) {
+            if (!sourceFile) {
+                errors.push(ts.createCompilerDiagnostic(message, arg0, arg1));
+            }
+        }
+    }
+    /*@internal*/
+    function isErrorNoInputFiles(error) {
+        return error.code === ts.Diagnostics.No_inputs_were_found_in_config_file_0_Specified_include_paths_were_1_and_exclude_paths_were_2.code;
+    }
+    ts.isErrorNoInputFiles = isErrorNoInputFiles;
+    /*@internal*/
+    function getErrorForNoInputFiles(_a, configFileName) {
+        var includeSpecs = _a.includeSpecs, excludeSpecs = _a.excludeSpecs;
+        return ts.createCompilerDiagnostic(ts.Diagnostics.No_inputs_were_found_in_config_file_0_Specified_include_paths_were_1_and_exclude_paths_were_2, configFileName || "tsconfig.json", JSON.stringify(includeSpecs || []), JSON.stringify(excludeSpecs || []));
+    }
+    ts.getErrorForNoInputFiles = getErrorForNoInputFiles;
+    function isSuccessfulParsedTsconfig(value) {
+        return !!value.options;
+    }
+    /**
+     * This *just* extracts options/include/exclude/files out of a config file.
+     * It does *not* resolve the included files.
+     */
+    function parseConfig(json, sourceFile, host, basePath, configFileName, resolutionStack, errors) {
+        basePath = ts.normalizeSlashes(basePath);
+        var resolvedPath = ts.getNormalizedAbsolutePath(configFileName || "", basePath);
+        if (resolutionStack.indexOf(resolvedPath) >= 0) {
+            errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Circularity_detected_while_resolving_configuration_Colon_0, resolutionStack.concat([resolvedPath]).join(" -> ")));
+            return { raw: json || convertToObject(sourceFile, errors) };
+        }
+        var ownConfig = json ?
+            parseOwnConfigOfJson(json, host, basePath, configFileName, errors) :
+            parseOwnConfigOfJsonSourceFile(sourceFile, host, basePath, configFileName, errors);
+        if (ownConfig.extendedConfigPath) {
+            // copy the resolution stack so it is never reused between branches in potential diamond-problem scenarios.
+            resolutionStack = resolutionStack.concat([resolvedPath]);
+            var extendedConfig = getExtendedConfig(sourceFile, ownConfig.extendedConfigPath, host, basePath, resolutionStack, errors);
+            if (extendedConfig && isSuccessfulParsedTsconfig(extendedConfig)) {
+                var baseRaw_1 = extendedConfig.raw;
+                var raw_1 = ownConfig.raw;
+                var setPropertyInRawIfNotUndefined = function (propertyName) {
+                    var value = raw_1[propertyName] || baseRaw_1[propertyName];
+                    if (value) {
+                        raw_1[propertyName] = value;
+                    }
+                };
+                setPropertyInRawIfNotUndefined("include");
+                setPropertyInRawIfNotUndefined("exclude");
+                setPropertyInRawIfNotUndefined("files");
+                if (raw_1.compileOnSave === undefined) {
+                    raw_1.compileOnSave = baseRaw_1.compileOnSave;
+                }
+                ownConfig.options = ts.assign({}, extendedConfig.options, ownConfig.options);
+                // TODO extend type typeAcquisition
+            }
+        }
+        return ownConfig;
+    }
+    function parseOwnConfigOfJson(json, host, basePath, configFileName, errors) {
+        if (ts.hasProperty(json, "excludes")) {
+            errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Unknown_option_excludes_Did_you_mean_exclude));
+        }
+        var options = convertCompilerOptionsFromJsonWorker(json.compilerOptions, basePath, errors, configFileName);
+        // typingOptions has been deprecated and is only supported for backward compatibility purposes.
+        // It should be removed in future releases - use typeAcquisition instead.
+        var typeAcquisition = convertTypeAcquisitionFromJsonWorker(json.typeAcquisition || json.typingOptions, basePath, errors, configFileName);
+        json.compileOnSave = convertCompileOnSaveOptionFromJson(json, basePath, errors);
+        var extendedConfigPath;
+        if (json.extends) {
+            if (!ts.isString(json.extends)) {
+                errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "extends", "string"));
+            }
+            else {
+                var newBase = configFileName ? directoryOfCombinedPath(configFileName, basePath) : basePath;
+                extendedConfigPath = getExtendsConfigPath(json.extends, host, newBase, errors, ts.createCompilerDiagnostic);
+            }
+        }
+        return { raw: json, options: options, typeAcquisition: typeAcquisition, extendedConfigPath: extendedConfigPath };
+    }
+    function parseOwnConfigOfJsonSourceFile(sourceFile, host, basePath, configFileName, errors) {
+        var options = getDefaultCompilerOptions(configFileName);
+        var typeAcquisition, typingOptionstypeAcquisition;
+        var extendedConfigPath;
+        var optionsIterator = {
+            onSetValidOptionKeyValueInParent: function (parentOption, option, value) {
+                ts.Debug.assert(parentOption === "compilerOptions" || parentOption === "typeAcquisition" || parentOption === "typingOptions");
+                var currentOption = parentOption === "compilerOptions" ?
+                    options :
+                    parentOption === "typeAcquisition" ?
+                        (typeAcquisition || (typeAcquisition = getDefaultTypeAcquisition(configFileName))) :
+                        (typingOptionstypeAcquisition || (typingOptionstypeAcquisition = getDefaultTypeAcquisition(configFileName)));
+                currentOption[option.name] = normalizeOptionValue(option, basePath, value);
+            },
+            onSetValidOptionKeyValueInRoot: function (key, _keyNode, value, valueNode) {
+                switch (key) {
+                    case "extends":
+                        var newBase = configFileName ? directoryOfCombinedPath(configFileName, basePath) : basePath;
+                        extendedConfigPath = getExtendsConfigPath(value, host, newBase, errors, function (message, arg0) {
+                            return ts.createDiagnosticForNodeInSourceFile(sourceFile, valueNode, message, arg0);
+                        });
+                        return;
+                    case "files":
+                        if (value.length === 0) {
+                            errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, valueNode, ts.Diagnostics.The_files_list_in_config_file_0_is_empty, configFileName || "tsconfig.json"));
+                        }
+                        return;
+                }
+            },
+            onSetUnknownOptionKeyValueInRoot: function (key, keyNode, _value, _valueNode) {
+                if (key === "excludes") {
+                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, keyNode, ts.Diagnostics.Unknown_option_excludes_Did_you_mean_exclude));
+                }
+            }
+        };
+        var json = convertToObjectWorker(sourceFile, errors, /*returnValue*/ true, getTsconfigRootOptionsMap(), optionsIterator);
+        if (!typeAcquisition) {
+            if (typingOptionstypeAcquisition) {
+                typeAcquisition = (typingOptionstypeAcquisition.enableAutoDiscovery !== undefined) ?
+                    {
+                        enable: typingOptionstypeAcquisition.enableAutoDiscovery,
+                        include: typingOptionstypeAcquisition.include,
+                        exclude: typingOptionstypeAcquisition.exclude
+                    } :
+                    typingOptionstypeAcquisition;
+            }
+            else {
+                typeAcquisition = getDefaultTypeAcquisition(configFileName);
+            }
+        }
+        return { raw: json, options: options, typeAcquisition: typeAcquisition, extendedConfigPath: extendedConfigPath };
+    }
+    function getExtendsConfigPath(extendedConfig, host, basePath, errors, createDiagnostic) {
+        extendedConfig = ts.normalizeSlashes(extendedConfig);
+        // If the path isn't a rooted or relative path, don't try to resolve it (we reserve the right to special case module-id like paths in the future)
+        if (!(ts.isRootedDiskPath(extendedConfig) || ts.startsWith(extendedConfig, "./") || ts.startsWith(extendedConfig, "../"))) {
+            errors.push(createDiagnostic(ts.Diagnostics.A_path_in_an_extends_option_must_be_relative_or_rooted_but_0_is_not, extendedConfig));
+            return undefined;
+        }
+        var extendedConfigPath = ts.getNormalizedAbsolutePath(extendedConfig, basePath);
+        if (!host.fileExists(extendedConfigPath) && !ts.endsWith(extendedConfigPath, ".json" /* Json */)) {
+            extendedConfigPath = extendedConfigPath + ".json";
+            if (!host.fileExists(extendedConfigPath)) {
+                errors.push(createDiagnostic(ts.Diagnostics.File_0_does_not_exist, extendedConfig));
+                return undefined;
+            }
+        }
+        return extendedConfigPath;
+    }
+    function getExtendedConfig(sourceFile, extendedConfigPath, host, basePath, resolutionStack, errors) {
+        var _a;
+        var extendedResult = readJsonConfigFile(extendedConfigPath, function (path) { return host.readFile(path); });
+        if (sourceFile) {
+            (sourceFile.extendedSourceFiles || (sourceFile.extendedSourceFiles = [])).push(extendedResult.fileName);
+        }
+        if (extendedResult.parseDiagnostics.length) {
+            errors.push.apply(errors, extendedResult.parseDiagnostics);
+            return undefined;
+        }
+        var extendedDirname = ts.getDirectoryPath(extendedConfigPath);
+        var extendedConfig = parseConfig(/*json*/ undefined, extendedResult, host, extendedDirname, ts.getBaseFileName(extendedConfigPath), resolutionStack, errors);
+        if (sourceFile) {
+            (_a = sourceFile.extendedSourceFiles).push.apply(_a, extendedResult.extendedSourceFiles);
+        }
+        if (isSuccessfulParsedTsconfig(extendedConfig)) {
+            // Update the paths to reflect base path
+            var relativeDifference_1 = ts.convertToRelativePath(extendedDirname, basePath, ts.identity);
+            var updatePath_1 = function (path) { return ts.isRootedDiskPath(path) ? path : ts.combinePaths(relativeDifference_1, path); };
+            var mapPropertiesInRawIfNotUndefined = function (propertyName) {
+                if (raw_2[propertyName]) {
+                    raw_2[propertyName] = ts.map(raw_2[propertyName], updatePath_1);
+                }
+            };
+            var raw_2 = extendedConfig.raw;
+            mapPropertiesInRawIfNotUndefined("include");
+            mapPropertiesInRawIfNotUndefined("exclude");
+            mapPropertiesInRawIfNotUndefined("files");
+        }
+        return extendedConfig;
+    }
+    function convertCompileOnSaveOptionFromJson(jsonOption, basePath, errors) {
+        if (!ts.hasProperty(jsonOption, ts.compileOnSaveCommandLineOption.name)) {
+            return false;
+        }
+        var result = convertJsonOption(ts.compileOnSaveCommandLineOption, jsonOption.compileOnSave, basePath, errors);
+        return typeof result === "boolean" && result;
+    }
+    function convertCompilerOptionsFromJson(jsonOptions, basePath, configFileName) {
+        var errors = [];
+        var options = convertCompilerOptionsFromJsonWorker(jsonOptions, basePath, errors, configFileName);
+        return { options: options, errors: errors };
+    }
+    ts.convertCompilerOptionsFromJson = convertCompilerOptionsFromJson;
+    function convertTypeAcquisitionFromJson(jsonOptions, basePath, configFileName) {
+        var errors = [];
+        var options = convertTypeAcquisitionFromJsonWorker(jsonOptions, basePath, errors, configFileName);
+        return { options: options, errors: errors };
+    }
+    ts.convertTypeAcquisitionFromJson = convertTypeAcquisitionFromJson;
+    function getDefaultCompilerOptions(configFileName) {
+        var options = configFileName && ts.getBaseFileName(configFileName) === "jsconfig.json"
+            ? { allowJs: true, maxNodeModuleJsDepth: 2, allowSyntheticDefaultImports: true, skipLibCheck: true, noEmit: true }
+            : {};
+        return options;
+    }
+    function convertCompilerOptionsFromJsonWorker(jsonOptions, basePath, errors, configFileName) {
+        var options = getDefaultCompilerOptions(configFileName);
+        convertOptionsFromJson(ts.optionDeclarations, jsonOptions, basePath, options, ts.Diagnostics.Unknown_compiler_option_0, errors);
+        if (configFileName) {
+            options.configFilePath = ts.normalizeSlashes(configFileName);
+        }
+        return options;
+    }
+    function getDefaultTypeAcquisition(configFileName) {
+        return { enable: !!configFileName && ts.getBaseFileName(configFileName) === "jsconfig.json", include: [], exclude: [] };
+    }
+    function convertTypeAcquisitionFromJsonWorker(jsonOptions, basePath, errors, configFileName) {
+        var options = getDefaultTypeAcquisition(configFileName);
+        var typeAcquisition = convertEnableAutoDiscoveryToEnable(jsonOptions);
+        convertOptionsFromJson(ts.typeAcquisitionDeclarations, typeAcquisition, basePath, options, ts.Diagnostics.Unknown_type_acquisition_option_0, errors);
+        return options;
+    }
+    function convertOptionsFromJson(optionDeclarations, jsonOptions, basePath, defaultOptions, diagnosticMessage, errors) {
+        if (!jsonOptions) {
+            return;
+        }
+        var optionNameMap = commandLineOptionsToMap(optionDeclarations);
+        for (var id in jsonOptions) {
+            var opt = optionNameMap.get(id);
+            if (opt) {
+                defaultOptions[opt.name] = convertJsonOption(opt, jsonOptions[id], basePath, errors);
+            }
+            else {
+                errors.push(ts.createCompilerDiagnostic(diagnosticMessage, id));
+            }
+        }
+    }
+    function convertJsonOption(opt, value, basePath, errors) {
+        if (isCompilerOptionsValue(opt, value)) {
+            var optType = opt.type;
+            if (optType === "list" && ts.isArray(value)) {
+                return convertJsonOptionOfListType(opt, value, basePath, errors);
+            }
+            else if (!ts.isString(optType)) {
+                return convertJsonOptionOfCustomType(opt, value, errors);
+            }
+            return normalizeNonListOptionValue(opt, basePath, value);
+        }
+        else {
+            errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, opt.name, getCompilerOptionValueTypeString(opt)));
+        }
+    }
+    function normalizeOptionValue(option, basePath, value) {
+        if (isNullOrUndefined(value))
+            return undefined;
+        if (option.type === "list") {
+            var listOption_1 = option;
+            if (listOption_1.element.isFilePath || !ts.isString(listOption_1.element.type)) {
+                return ts.filter(ts.map(value, function (v) { return normalizeOptionValue(listOption_1.element, basePath, v); }), function (v) { return !!v; });
+            }
+            return value;
+        }
+        else if (!ts.isString(option.type)) {
+            return option.type.get(ts.isString(value) ? value.toLowerCase() : value);
+        }
+        return normalizeNonListOptionValue(option, basePath, value);
+    }
+    function normalizeNonListOptionValue(option, basePath, value) {
+        if (option.isFilePath) {
+            value = ts.normalizePath(ts.combinePaths(basePath, value));
+            if (value === "") {
+                value = ".";
+            }
+        }
+        return value;
+    }
+    function convertJsonOptionOfCustomType(opt, value, errors) {
+        if (isNullOrUndefined(value))
+            return undefined;
+        var key = value.toLowerCase();
+        var val = opt.type.get(key);
+        if (val !== undefined) {
+            return val;
+        }
+        else {
+            errors.push(createCompilerDiagnosticForInvalidCustomType(opt));
+        }
+    }
+    function convertJsonOptionOfListType(option, values, basePath, errors) {
+        return ts.filter(ts.map(values, function (v) { return convertJsonOption(option.element, v, basePath, errors); }), function (v) { return !!v; });
+    }
+    function trimString(s) {
+        return typeof s.trim === "function" ? s.trim() : s.replace(/^[\s]+|[\s]+$/g, "");
+    }
+    /**
+     * Tests for a path that ends in a recursive directory wildcard.
+     * Matches **, \**, **\, and \**\, but not a**b.
+     *
+     * NOTE: used \ in place of / above to avoid issues with multiline comments.
+     *
+     * Breakdown:
+     *  (^|\/)      # matches either the beginning of the string or a directory separator.
+     *  \*\*        # matches the recursive directory wildcard "**".
+     *  \/?$        # matches an optional trailing directory separator at the end of the string.
+     */
+    var invalidTrailingRecursionPattern = /(^|\/)\*\*\/?$/;
+    /**
+     * Tests for a path where .. appears after a recursive directory wildcard.
+     * Matches **\..\*, **\a\..\*, and **\.., but not ..\**\*
+     *
+     * NOTE: used \ in place of / above to avoid issues with multiline comments.
+     *
+     * Breakdown:
+     *  (^|\/)      # matches either the beginning of the string or a directory separator.
+     *  \*\*\/      # matches a recursive directory wildcard "**" followed by a directory separator.
+     *  (.*\/)?     # optionally matches any number of characters followed by a directory separator.
+     *  \.\.        # matches a parent directory path component ".."
+     *  ($|\/)      # matches either the end of the string or a directory separator.
+     */
+    var invalidDotDotAfterRecursiveWildcardPattern = /(^|\/)\*\*\/(.*\/)?\.\.($|\/)/;
+    /**
+     * Tests for a path containing a wildcard character in a directory component of the path.
+     * Matches \*\, \?\, and \a*b\, but not \a\ or \a\*.
+     *
+     * NOTE: used \ in place of / above to avoid issues with multiline comments.
+     *
+     * Breakdown:
+     *  \/          # matches a directory separator.
+     *  [^/]*?      # matches any number of characters excluding directory separators (non-greedy).
+     *  [*?]        # matches either a wildcard character (* or ?)
+     *  [^/]*       # matches any number of characters excluding directory separators (greedy).
+     *  \/          # matches a directory separator.
+     */
+    var watchRecursivePattern = /\/[^/]*?[*?][^/]*\//;
+    /**
+     * Matches the portion of a wildcard path that does not contain wildcards.
+     * Matches \a of \a\*, or \a\b\c of \a\b\c\?\d.
+     *
+     * NOTE: used \ in place of / above to avoid issues with multiline comments.
+     *
+     * Breakdown:
+     *  ^                   # matches the beginning of the string
+     *  [^*?]*              # matches any number of non-wildcard characters
+     *  (?=\/[^/]*[*?])     # lookahead that matches a directory separator followed by
+     *                      # a path component that contains at least one wildcard character (* or ?).
+     */
+    var wildcardDirectoryPattern = /^[^*?]*(?=\/[^/]*[*?])/;
+    /**
+     * Expands an array of file specifications.
+     *
+     * @param filesSpecs The literal file names to include.
+     * @param includeSpecs The wildcard file specifications to include.
+     * @param excludeSpecs The wildcard file specifications to exclude.
+     * @param basePath The base path for any relative file specifications.
+     * @param options Compiler options.
+     * @param host The host used to resolve files and directories.
+     * @param errors An array for diagnostic reporting.
+     */
+    function matchFileNames(filesSpecs, includeSpecs, excludeSpecs, basePath, options, host, errors, extraFileExtensions, jsonSourceFile) {
+        basePath = ts.normalizePath(basePath);
+        var validatedIncludeSpecs, validatedExcludeSpecs;
+        // The exclude spec list is converted into a regular expression, which allows us to quickly
+        // test whether a file or directory should be excluded before recursively traversing the
+        // file system.
+        if (includeSpecs) {
+            validatedIncludeSpecs = validateSpecs(includeSpecs, errors, /*allowTrailingRecursion*/ false, jsonSourceFile, "include");
+        }
+        if (excludeSpecs) {
+            validatedExcludeSpecs = validateSpecs(excludeSpecs, errors, /*allowTrailingRecursion*/ true, jsonSourceFile, "exclude");
+        }
+        // Wildcard directories (provided as part of a wildcard path) are stored in a
+        // file map that marks whether it was a regular wildcard match (with a `*` or `?` token),
+        // or a recursive directory. This information is used by filesystem watchers to monitor for
+        // new entries in these paths.
+        var wildcardDirectories = getWildcardDirectories(validatedIncludeSpecs, validatedExcludeSpecs, basePath, host.useCaseSensitiveFileNames);
+        var spec = { filesSpecs: filesSpecs, referencesSpecs: undefined, includeSpecs: includeSpecs, excludeSpecs: excludeSpecs, validatedIncludeSpecs: validatedIncludeSpecs, validatedExcludeSpecs: validatedExcludeSpecs, wildcardDirectories: wildcardDirectories };
+        return getFileNamesFromConfigSpecs(spec, basePath, options, host, extraFileExtensions);
+    }
+    /**
+     * Gets the file names from the provided config file specs that contain, files, include, exclude and
+     * other properties needed to resolve the file names
+     * @param spec The config file specs extracted with file names to include, wildcards to include/exclude and other details
+     * @param basePath The base path for any relative file specifications.
+     * @param options Compiler options.
+     * @param host The host used to resolve files and directories.
+     * @param extraFileExtensions optionaly file extra file extension information from host
+     */
+    /* @internal */
+    function getFileNamesFromConfigSpecs(spec, basePath, options, host, extraFileExtensions) {
+        if (extraFileExtensions === void 0) { extraFileExtensions = []; }
+        basePath = ts.normalizePath(basePath);
+        var keyMapper = host.useCaseSensitiveFileNames ? ts.identity : ts.toLowerCase;
+        // Literal file names (provided via the "files" array in tsconfig.json) are stored in a
+        // file map with a possibly case insensitive key. We use this map later when when including
+        // wildcard paths.
+        var literalFileMap = ts.createMap();
+        // Wildcard paths (provided via the "includes" array in tsconfig.json) are stored in a
+        // file map with a possibly case insensitive key. We use this map to store paths matched
+        // via wildcard, and to handle extension priority.
+        var wildcardFileMap = ts.createMap();
+        var filesSpecs = spec.filesSpecs, validatedIncludeSpecs = spec.validatedIncludeSpecs, validatedExcludeSpecs = spec.validatedExcludeSpecs, wildcardDirectories = spec.wildcardDirectories;
+        // Rather than requery this for each file and filespec, we query the supported extensions
+        // once and store it on the expansion context.
+        var supportedExtensions = ts.getSupportedExtensions(options, extraFileExtensions);
+        // Literal files are always included verbatim. An "include" or "exclude" specification cannot
+        // remove a literal file.
+        if (filesSpecs) {
+            for (var _i = 0, filesSpecs_1 = filesSpecs; _i < filesSpecs_1.length; _i++) {
+                var fileName = filesSpecs_1[_i];
+                var file = ts.getNormalizedAbsolutePath(fileName, basePath);
+                literalFileMap.set(keyMapper(file), file);
+            }
+        }
+        if (validatedIncludeSpecs && validatedIncludeSpecs.length > 0) {
+            for (var _a = 0, _b = host.readDirectory(basePath, supportedExtensions, validatedExcludeSpecs, validatedIncludeSpecs, /*depth*/ undefined); _a < _b.length; _a++) {
+                var file = _b[_a];
+                // If we have already included a literal or wildcard path with a
+                // higher priority extension, we should skip this file.
+                //
+                // This handles cases where we may encounter both <file>.ts and
+                // <file>.d.ts (or <file>.js if "allowJs" is enabled) in the same
+                // directory when they are compilation outputs.
+                if (hasFileWithHigherPriorityExtension(file, literalFileMap, wildcardFileMap, supportedExtensions, keyMapper)) {
+                    continue;
+                }
+                // We may have included a wildcard path with a lower priority
+                // extension due to the user-defined order of entries in the
+                // "include" array. If there is a lower priority extension in the
+                // same directory, we should remove it.
+                removeWildcardFilesWithLowerPriorityExtension(file, wildcardFileMap, supportedExtensions, keyMapper);
+                var key = keyMapper(file);
+                if (!literalFileMap.has(key) && !wildcardFileMap.has(key)) {
+                    wildcardFileMap.set(key, file);
+                }
+            }
+        }
+        var literalFiles = ts.arrayFrom(literalFileMap.values());
+        var wildcardFiles = ts.arrayFrom(wildcardFileMap.values());
+        var projectReferences = spec.referencesSpecs && spec.referencesSpecs.map(function (r) {
+            return __assign({}, r, { path: ts.getNormalizedAbsolutePath(r.path, basePath) });
+        });
+        return {
+            fileNames: literalFiles.concat(wildcardFiles),
+            projectReferences: projectReferences,
+            wildcardDirectories: wildcardDirectories,
+            spec: spec
+        };
+    }
+    ts.getFileNamesFromConfigSpecs = getFileNamesFromConfigSpecs;
+    function validateSpecs(specs, errors, allowTrailingRecursion, jsonSourceFile, specKey) {
+        return specs.filter(function (spec) {
+            var diag = specToDiagnostic(spec, allowTrailingRecursion);
+            if (diag !== undefined) {
+                errors.push(createDiagnostic(diag, spec));
+            }
+            return diag === undefined;
+        });
+        function createDiagnostic(message, spec) {
+            var element = ts.getTsConfigPropArrayElementValue(jsonSourceFile, specKey, spec);
+            return element ?
+                ts.createDiagnosticForNodeInSourceFile(jsonSourceFile, element, message, spec) :
+                ts.createCompilerDiagnostic(message, spec);
+        }
+    }
+    function specToDiagnostic(spec, allowTrailingRecursion) {
+        if (!allowTrailingRecursion && invalidTrailingRecursionPattern.test(spec)) {
+            return ts.Diagnostics.File_specification_cannot_end_in_a_recursive_directory_wildcard_Asterisk_Asterisk_Colon_0;
+        }
+        else if (invalidDotDotAfterRecursiveWildcardPattern.test(spec)) {
+            return ts.Diagnostics.File_specification_cannot_contain_a_parent_directory_that_appears_after_a_recursive_directory_wildcard_Asterisk_Asterisk_Colon_0;
+        }
+    }
+    /**
+     * Gets directories in a set of include patterns that should be watched for changes.
+     */
+    function getWildcardDirectories(include, exclude, path, useCaseSensitiveFileNames) {
+        // We watch a directory recursively if it contains a wildcard anywhere in a directory segment
+        // of the pattern:
+        //
+        //  /a/b/**/d   - Watch /a/b recursively to catch changes to any d in any subfolder recursively
+        //  /a/b/*/d    - Watch /a/b recursively to catch any d in any immediate subfolder, even if a new subfolder is added
+        //  /a/b        - Watch /a/b recursively to catch changes to anything in any recursive subfoler
+        //
+        // We watch a directory without recursion if it contains a wildcard in the file segment of
+        // the pattern:
+        //
+        //  /a/b/*      - Watch /a/b directly to catch any new file
+        //  /a/b/a?z    - Watch /a/b directly to catch any new file matching a?z
+        var rawExcludeRegex = ts.getRegularExpressionForWildcard(exclude, path, "exclude");
+        var excludeRegex = rawExcludeRegex && new RegExp(rawExcludeRegex, useCaseSensitiveFileNames ? "" : "i");
+        var wildcardDirectories = {};
+        if (include !== undefined) {
+            var recursiveKeys = [];
+            for (var _i = 0, include_1 = include; _i < include_1.length; _i++) {
+                var file = include_1[_i];
+                var spec = ts.normalizePath(ts.combinePaths(path, file));
+                if (excludeRegex && excludeRegex.test(spec)) {
+                    continue;
+                }
+                var match = getWildcardDirectoryFromSpec(spec, useCaseSensitiveFileNames);
+                if (match) {
+                    var key = match.key, flags = match.flags;
+                    var existingFlags = wildcardDirectories[key];
+                    if (existingFlags === undefined || existingFlags < flags) {
+                        wildcardDirectories[key] = flags;
+                        if (flags === 1 /* Recursive */) {
+                            recursiveKeys.push(key);
+                        }
+                    }
+                }
+            }
+            // Remove any subpaths under an existing recursively watched directory.
+            for (var key in wildcardDirectories) {
+                if (ts.hasProperty(wildcardDirectories, key)) {
+                    for (var _a = 0, recursiveKeys_1 = recursiveKeys; _a < recursiveKeys_1.length; _a++) {
+                        var recursiveKey = recursiveKeys_1[_a];
+                        if (key !== recursiveKey && ts.containsPath(recursiveKey, key, path, !useCaseSensitiveFileNames)) {
+                            delete wildcardDirectories[key];
+                        }
+                    }
+                }
+            }
+        }
+        return wildcardDirectories;
+    }
+    function getWildcardDirectoryFromSpec(spec, useCaseSensitiveFileNames) {
+        var match = wildcardDirectoryPattern.exec(spec);
+        if (match) {
+            return {
+                key: useCaseSensitiveFileNames ? match[0] : match[0].toLowerCase(),
+                flags: watchRecursivePattern.test(spec) ? 1 /* Recursive */ : 0 /* None */
+            };
+        }
+        if (ts.isImplicitGlob(spec)) {
+            return { key: spec, flags: 1 /* Recursive */ };
+        }
+        return undefined;
+    }
+    /**
+     * Determines whether a literal or wildcard file has already been included that has a higher
+     * extension priority.
+     *
+     * @param file The path to the file.
+     * @param extensionPriority The priority of the extension.
+     * @param context The expansion context.
+     */
+    function hasFileWithHigherPriorityExtension(file, literalFiles, wildcardFiles, extensions, keyMapper) {
+        var extensionPriority = ts.getExtensionPriority(file, extensions);
+        var adjustedExtensionPriority = ts.adjustExtensionPriority(extensionPriority, extensions);
+        for (var i = 0 /* Highest */; i < adjustedExtensionPriority; i++) {
+            var higherPriorityExtension = extensions[i];
+            var higherPriorityPath = keyMapper(ts.changeExtension(file, higherPriorityExtension));
+            if (literalFiles.has(higherPriorityPath) || wildcardFiles.has(higherPriorityPath)) {
+                return true;
+            }
+        }
+        return false;
+    }
+    /**
+     * Removes files included via wildcard expansion with a lower extension priority that have
+     * already been included.
+     *
+     * @param file The path to the file.
+     * @param extensionPriority The priority of the extension.
+     * @param context The expansion context.
+     */
+    function removeWildcardFilesWithLowerPriorityExtension(file, wildcardFiles, extensions, keyMapper) {
+        var extensionPriority = ts.getExtensionPriority(file, extensions);
+        var nextExtensionPriority = ts.getNextLowestExtensionPriority(extensionPriority, extensions);
+        for (var i = nextExtensionPriority; i < extensions.length; i++) {
+            var lowerPriorityExtension = extensions[i];
+            var lowerPriorityPath = keyMapper(ts.changeExtension(file, lowerPriorityExtension));
+            wildcardFiles.delete(lowerPriorityPath);
+        }
+    }
+    /**
+     * Produces a cleaned version of compiler options with personally identifiying info (aka, paths) removed.
+     * Also converts enum values back to strings.
+     */
+    /* @internal */
+    function convertCompilerOptionsForTelemetry(opts) {
+        var out = {};
+        for (var key in opts) {
+            if (opts.hasOwnProperty(key)) {
+                var type = getOptionFromName(key);
+                if (type !== undefined) { // Ignore unknown options
+                    out[key] = getOptionValueWithEmptyStrings(opts[key], type);
+                }
+            }
+        }
+        return out;
+    }
+    ts.convertCompilerOptionsForTelemetry = convertCompilerOptionsForTelemetry;
+    function getOptionValueWithEmptyStrings(value, option) {
+        switch (option.type) {
+            case "object": // "paths". Can't get any useful information from the value since we blank out strings, so just return "".
+                return "";
+            case "string": // Could be any arbitrary string -- use empty string instead.
+                return "";
+            case "number": // Allow numbers, but be sure to check it's actually a number.
+                return typeof value === "number" ? value : "";
+            case "boolean":
+                return typeof value === "boolean" ? value : "";
+            case "list":
+                var elementType_1 = option.element;
+                return ts.isArray(value) ? value.map(function (v) { return getOptionValueWithEmptyStrings(v, elementType_1); }) : "";
+            default:
+                return ts.forEachEntry(option.type, function (optionEnumValue, optionStringValue) {
+                    if (optionEnumValue === value) {
+                        return optionStringValue;
+                    }
+                }); // TODO: GH#18217
+        }
+    }
+})(ts || (ts = {}));
+var ts;
+(function (ts) {
+    function trace(host) {
+        host.trace(ts.formatMessage.apply(undefined, arguments));
+    }
+    ts.trace = trace;
+    /* @internal */
+    function isTraceEnabled(compilerOptions, host) {
+        return !!compilerOptions.traceResolution && host.trace !== undefined;
+    }
+    ts.isTraceEnabled = isTraceEnabled;
+    function withPackageId(packageId, r) {
+        return r && { path: r.path, extension: r.ext, packageId: packageId };
+    }
+    function noPackageId(r) {
+        return withPackageId(/*packageId*/ undefined, r);
+    }
+    /**
+     * Kinds of file that we are currently looking for.
+     * Typically there is one pass with Extensions.TypeScript, then a second pass with Extensions.JavaScript.
+     */
+    var Extensions;
+    (function (Extensions) {
+        Extensions[Extensions["TypeScript"] = 0] = "TypeScript";
+        Extensions[Extensions["JavaScript"] = 1] = "JavaScript";
+        Extensions[Extensions["Json"] = 2] = "Json";
+        Extensions[Extensions["DtsOnly"] = 3] = "DtsOnly"; /** Only '.d.ts' */
+    })(Extensions || (Extensions = {}));
+    /** Used with `Extensions.DtsOnly` to extract the path from TypeScript results. */
+    function resolvedTypeScriptOnly(resolved) {
+        if (!resolved) {
+            return undefined;
+        }
+        ts.Debug.assert(ts.extensionIsTypeScript(resolved.extension));
+        return { fileName: resolved.path, packageId: resolved.packageId };
+    }
+    function createResolvedModuleWithFailedLookupLocations(resolved, originalPath, isExternalLibraryImport, failedLookupLocations) {
+        return {
+            resolvedModule: resolved && { resolvedFileName: resolved.path, originalPath: originalPath, extension: resolved.extension, isExternalLibraryImport: isExternalLibraryImport, packageId: resolved.packageId },
+            failedLookupLocations: failedLookupLocations
+        };
+    }
+    /** Reads from "main" or "types"/"typings" depending on `extensions`. */
+    function tryReadPackageJsonFields(readTypes, jsonContent, baseDirectory, state) {
+        return readTypes ? tryReadFromField("typings") || tryReadFromField("types") : tryReadFromField("main");
+        function tryReadFromField(fieldName) {
+            if (!ts.hasProperty(jsonContent, fieldName)) {
+                if (state.traceEnabled) {
+                    trace(state.host, ts.Diagnostics.package_json_does_not_have_a_0_field, fieldName);
+                }
+                return;
+            }
+            var fileName = jsonContent[fieldName];
+            if (!ts.isString(fileName)) {
+                if (state.traceEnabled) {
+                    trace(state.host, ts.Diagnostics.Expected_type_of_0_field_in_package_json_to_be_string_got_1, fieldName, typeof fileName);
+                }
+                return;
+            }
+            var path = ts.normalizePath(ts.combinePaths(baseDirectory, fileName));
+            if (state.traceEnabled) {
+                trace(state.host, ts.Diagnostics.package_json_has_0_field_1_that_references_2, fieldName, fileName, path);
+            }
+            return path;
+        }
+    }
+    /* @internal */
+    function readJson(path, host) {
+        try {
+            var jsonText = host.readFile(path);
+            if (!jsonText)
+                return {};
+            var result = ts.parseConfigFileTextToJson(path, jsonText);
+            if (result.error) {
+                return {};
+            }
+            return result.config;
+        }
+        catch (e) {
+            // gracefully handle if readFile fails or returns not JSON
+            return {};
+        }
+    }
+    ts.readJson = readJson;
+    function getEffectiveTypeRoots(options, host) {
+        if (options.typeRoots) {
+            return options.typeRoots;
+        }
+        var currentDirectory;
+        if (options.configFilePath) {
+            currentDirectory = ts.getDirectoryPath(options.configFilePath);
+        }
+        else if (host.getCurrentDirectory) {
+            currentDirectory = host.getCurrentDirectory();
+        }
+        if (currentDirectory !== undefined) {
+            return getDefaultTypeRoots(currentDirectory, host);
+        }
+    }
+    ts.getEffectiveTypeRoots = getEffectiveTypeRoots;
+    /**
+     * Returns the path to every node_modules/@types directory from some ancestor directory.
+     * Returns undefined if there are none.
+     */
+    function getDefaultTypeRoots(currentDirectory, host) {
+        if (!host.directoryExists) {
+            return [ts.combinePaths(currentDirectory, nodeModulesAtTypes)];
+            // And if it doesn't exist, tough.
+        }
+        var typeRoots;
+        ts.forEachAncestorDirectory(ts.normalizePath(currentDirectory), function (directory) {
+            var atTypes = ts.combinePaths(directory, nodeModulesAtTypes);
+            if (host.directoryExists(atTypes)) {
+                (typeRoots || (typeRoots = [])).push(atTypes);
+            }
+            return undefined;
+        });
+        return typeRoots;
+    }
+    var nodeModulesAtTypes = ts.combinePaths("node_modules", "@types");
+    /**
+     * @param {string | undefined} containingFile - file that contains type reference directive, can be undefined if containing file is unknown.
+     * This is possible in case if resolution is performed for directives specified via 'types' parameter. In this case initial path for secondary lookups
+     * is assumed to be the same as root directory of the project.
+     */
+    function resolveTypeReferenceDirective(typeReferenceDirectiveName, containingFile, options, host) {
+        var traceEnabled = isTraceEnabled(options, host);
+        var moduleResolutionState = { compilerOptions: options, host: host, traceEnabled: traceEnabled };
+        var typeRoots = getEffectiveTypeRoots(options, host);
+        if (traceEnabled) {
+            if (containingFile === undefined) {
+                if (typeRoots === undefined) {
+                    trace(host, ts.Diagnostics.Resolving_type_reference_directive_0_containing_file_not_set_root_directory_not_set, typeReferenceDirectiveName);
+                }
+                else {
+                    trace(host, ts.Diagnostics.Resolving_type_reference_directive_0_containing_file_not_set_root_directory_1, typeReferenceDirectiveName, typeRoots);
+                }
+            }
+            else {
+                if (typeRoots === undefined) {
+                    trace(host, ts.Diagnostics.Resolving_type_reference_directive_0_containing_file_1_root_directory_not_set, typeReferenceDirectiveName, containingFile);
+                }
+                else {
+                    trace(host, ts.Diagnostics.Resolving_type_reference_directive_0_containing_file_1_root_directory_2, typeReferenceDirectiveName, containingFile, typeRoots);
+                }
+            }
+        }
+        var failedLookupLocations = [];
+        var resolved = primaryLookup();
+        var primary = true;
+        if (!resolved) {
+            resolved = secondaryLookup();
+            primary = false;
+        }
+        var resolvedTypeReferenceDirective;
+        if (resolved) {
+            if (!options.preserveSymlinks) {
+                resolved = __assign({}, resolved, { fileName: realPath(resolved.fileName, host, traceEnabled) });
+            }
+            if (traceEnabled) {
+                trace(host, ts.Diagnostics.Type_reference_directive_0_was_successfully_resolved_to_1_primary_Colon_2, typeReferenceDirectiveName, resolved.fileName, primary);
+            }
+            resolvedTypeReferenceDirective = { primary: primary, resolvedFileName: resolved.fileName, packageId: resolved.packageId };
+        }
+        return { resolvedTypeReferenceDirective: resolvedTypeReferenceDirective, failedLookupLocations: failedLookupLocations };
+        function primaryLookup() {
+            // Check primary library paths
+            if (typeRoots && typeRoots.length) {
+                if (traceEnabled) {
+                    trace(host, ts.Diagnostics.Resolving_with_primary_search_path_0, typeRoots.join(", "));
+                }
+                return ts.forEach(typeRoots, function (typeRoot) {
+                    var candidate = ts.combinePaths(typeRoot, typeReferenceDirectiveName);
+                    var candidateDirectory = ts.getDirectoryPath(candidate);
+                    var directoryExists = directoryProbablyExists(candidateDirectory, host);
+                    if (!directoryExists && traceEnabled) {
+                        trace(host, ts.Diagnostics.Directory_0_does_not_exist_skipping_all_lookups_in_it, candidateDirectory);
+                    }
+                    return resolvedTypeScriptOnly(loadNodeModuleFromDirectory(Extensions.DtsOnly, candidate, failedLookupLocations, !directoryExists, moduleResolutionState));
+                });
+            }
+            else {
+                if (traceEnabled) {
+                    trace(host, ts.Diagnostics.Root_directory_cannot_be_determined_skipping_primary_search_paths);
+                }
+            }
+        }
+        function secondaryLookup() {
+            var initialLocationForSecondaryLookup = containingFile && ts.getDirectoryPath(containingFile);
+            if (initialLocationForSecondaryLookup !== undefined) {
+                // check secondary locations
+                if (traceEnabled) {
+                    trace(host, ts.Diagnostics.Looking_up_in_node_modules_folder_initial_location_0, initialLocationForSecondaryLookup);
+                }
+                var result = loadModuleFromNodeModules(Extensions.DtsOnly, typeReferenceDirectiveName, initialLocationForSecondaryLookup, failedLookupLocations, moduleResolutionState, /*cache*/ undefined);
+                var resolvedFile = resolvedTypeScriptOnly(result && result.value);
+                if (!resolvedFile && traceEnabled) {
+                    trace(host, ts.Diagnostics.Type_reference_directive_0_was_not_resolved, typeReferenceDirectiveName);
+                }
+                return resolvedFile;
+            }
+            else {
+                if (traceEnabled) {
+                    trace(host, ts.Diagnostics.Containing_file_is_not_specified_and_root_directory_cannot_be_determined_skipping_lookup_in_node_modules_folder);
+                }
+            }
+        }
+    }
+    ts.resolveTypeReferenceDirective = resolveTypeReferenceDirective;
+    /**
+     * Given a set of options, returns the set of type directive names
+     *   that should be included for this program automatically.
+     * This list could either come from the config file,
+     *   or from enumerating the types root + initial secondary types lookup location.
+     * More type directives might appear in the program later as a result of loading actual source files;
+     *   this list is only the set of defaults that are implicitly included.
+     */
+    function getAutomaticTypeDirectiveNames(options, host) {
+        // Use explicit type list from tsconfig.json
+        if (options.types) {
+            return options.types;
+        }
+        // Walk the primary type lookup locations
+        var result = [];
+        if (host.directoryExists && host.getDirectories) {
+            var typeRoots = getEffectiveTypeRoots(options, host);
+            if (typeRoots) {
+                for (var _i = 0, typeRoots_1 = typeRoots; _i < typeRoots_1.length; _i++) {
+                    var root = typeRoots_1[_i];
+                    if (host.directoryExists(root)) {
+                        for (var _a = 0, _b = host.getDirectories(root); _a < _b.length; _a++) {
+                            var typeDirectivePath = _b[_a];
+                            var normalized = ts.normalizePath(typeDirectivePath);
+                            var packageJsonPath = pathToPackageJson(ts.combinePaths(root, normalized));
+                            // `types-publisher` sometimes creates packages with `"typings": null` for packages that don't provide their own types.
+                            // See `createNotNeededPackageJSON` in the types-publisher` repo.
+                            // tslint:disable-next-line:no-null-keyword
+                            var isNotNeededPackage = host.fileExists(packageJsonPath) && readJson(packageJsonPath, host).typings === null;
+                            if (!isNotNeededPackage) {
+                                // Return just the type directive names
+                                result.push(ts.getBaseFileName(normalized));
+                            }
+                        }
+                    }
+                }
+            }
+        }
+        return result;
+    }
+    ts.getAutomaticTypeDirectiveNames = getAutomaticTypeDirectiveNames;
+    function createModuleResolutionCache(currentDirectory, getCanonicalFileName) {
+        return createModuleResolutionCacheWithMaps(ts.createMap(), ts.createMap(), currentDirectory, getCanonicalFileName);
+    }
+    ts.createModuleResolutionCache = createModuleResolutionCache;
+    /*@internal*/
+    function createModuleResolutionCacheWithMaps(directoryToModuleNameMap, moduleNameToDirectoryMap, currentDirectory, getCanonicalFileName) {
+        return { getOrCreateCacheForDirectory: getOrCreateCacheForDirectory, getOrCreateCacheForModuleName: getOrCreateCacheForModuleName };
+        function getOrCreateCacheForDirectory(directoryName) {
+            var path = ts.toPath(directoryName, currentDirectory, getCanonicalFileName);
+            var perFolderCache = directoryToModuleNameMap.get(path);
+            if (!perFolderCache) {
+                perFolderCache = ts.createMap();
+                directoryToModuleNameMap.set(path, perFolderCache);
+            }
+            return perFolderCache;
+        }
+        function getOrCreateCacheForModuleName(nonRelativeModuleName) {
+            if (ts.isExternalModuleNameRelative(nonRelativeModuleName)) {
+                return undefined; // TODO: GH#18217
+            }
+            var perModuleNameCache = moduleNameToDirectoryMap.get(nonRelativeModuleName);
+            if (!perModuleNameCache) {
+                perModuleNameCache = createPerModuleNameCache();
+                moduleNameToDirectoryMap.set(nonRelativeModuleName, perModuleNameCache);
+            }
+            return perModuleNameCache;
+        }
+        function createPerModuleNameCache() {
+            var directoryPathMap = ts.createMap();
+            return { get: get, set: set };
+            function get(directory) {
+                return directoryPathMap.get(ts.toPath(directory, currentDirectory, getCanonicalFileName));
+            }
+            /**
+             * At first this function add entry directory -> module resolution result to the table.
+             * Then it computes the set of parent folders for 'directory' that should have the same module resolution result
+             * and for every parent folder in set it adds entry: parent -> module resolution. .
+             * Lets say we first directory name: /a/b/c/d/e and resolution result is: /a/b/bar.ts.
+             * Set of parent folders that should have the same result will be:
+             * [
+             *     /a/b/c/d, /a/b/c, /a/b
+             * ]
+             * this means that request for module resolution from file in any of these folder will be immediately found in cache.
+             */
+            function set(directory, result) {
+                var path = ts.toPath(directory, currentDirectory, getCanonicalFileName);
+                // if entry is already in cache do nothing
+                if (directoryPathMap.has(path)) {
+                    return;
+                }
+                directoryPathMap.set(path, result);
+                var resolvedFileName = result.resolvedModule && result.resolvedModule.resolvedFileName;
+                // find common prefix between directory and resolved file name
+                // this common prefix should be the shorted path that has the same resolution
+                // directory: /a/b/c/d/e
+                // resolvedFileName: /a/b/foo.d.ts
+                var commonPrefix = getCommonPrefix(path, resolvedFileName);
+                var current = path;
+                while (true) {
+                    var parent = ts.getDirectoryPath(current);
+                    if (parent === current || directoryPathMap.has(parent)) {
+                        break;
+                    }
+                    directoryPathMap.set(parent, result);
+                    current = parent;
+                    if (current === commonPrefix) {
+                        break;
+                    }
+                }
+            }
+            function getCommonPrefix(directory, resolution) {
+                if (resolution === undefined) {
+                    return undefined;
+                }
+                var resolutionDirectory = ts.toPath(ts.getDirectoryPath(resolution), currentDirectory, getCanonicalFileName);
+                // find first position where directory and resolution differs
+                var i = 0;
+                while (i < Math.min(directory.length, resolutionDirectory.length) && directory.charCodeAt(i) === resolutionDirectory.charCodeAt(i)) {
+                    i++;
+                }
+                // find last directory separator before position i
+                var sep = directory.lastIndexOf(ts.directorySeparator, i);
+                if (sep < 0) {
+                    return undefined;
+                }
+                return directory.substr(0, sep);
+            }
+        }
+    }
+    ts.createModuleResolutionCacheWithMaps = createModuleResolutionCacheWithMaps;
+    function resolveModuleNameFromCache(moduleName, containingFile, cache) {
+        var containingDirectory = ts.getDirectoryPath(containingFile);
+        var perFolderCache = cache && cache.getOrCreateCacheForDirectory(containingDirectory);
+        return perFolderCache && perFolderCache.get(moduleName);
+    }
+    ts.resolveModuleNameFromCache = resolveModuleNameFromCache;
+    function resolveModuleName(moduleName, containingFile, compilerOptions, host, cache) {
+        var traceEnabled = isTraceEnabled(compilerOptions, host);
+        if (traceEnabled) {
+            trace(host, ts.Diagnostics.Resolving_module_0_from_1, moduleName, containingFile);
+        }
+        var containingDirectory = ts.getDirectoryPath(containingFile);
+        var perFolderCache = cache && cache.getOrCreateCacheForDirectory(containingDirectory);
+        var result = perFolderCache && perFolderCache.get(moduleName);
+        if (result) {
+            if (traceEnabled) {
+                trace(host, ts.Diagnostics.Resolution_for_module_0_was_found_in_cache_from_location_1, moduleName, containingDirectory);
+            }
+        }
+        else {
+            var moduleResolution = compilerOptions.moduleResolution;
+            if (moduleResolution === undefined) {
+                moduleResolution = ts.getEmitModuleKind(compilerOptions) === ts.ModuleKind.CommonJS ? ts.ModuleResolutionKind.NodeJs : ts.ModuleResolutionKind.Classic;
+                if (traceEnabled) {
+                    trace(host, ts.Diagnostics.Module_resolution_kind_is_not_specified_using_0, ts.ModuleResolutionKind[moduleResolution]);
+                }
+            }
+            else {
+                if (traceEnabled) {
+                    trace(host, ts.Diagnostics.Explicitly_specified_module_resolution_kind_Colon_0, ts.ModuleResolutionKind[moduleResolution]);
+                }
+            }
+            switch (moduleResolution) {
+                case ts.ModuleResolutionKind.NodeJs:
+                    result = nodeModuleNameResolver(moduleName, containingFile, compilerOptions, host, cache);
+                    break;
+                case ts.ModuleResolutionKind.Classic:
+                    result = classicNameResolver(moduleName, containingFile, compilerOptions, host, cache);
+                    break;
+                default:
+                    return ts.Debug.fail("Unexpected moduleResolution: " + moduleResolution);
+            }
+            if (perFolderCache) {
+                perFolderCache.set(moduleName, result);
+                // put result in per-module name cache
+                var perModuleNameCache = cache.getOrCreateCacheForModuleName(moduleName);
+                if (perModuleNameCache) {
+                    perModuleNameCache.set(containingDirectory, result);
+                }
+            }
+        }
+        if (traceEnabled) {
+            if (result.resolvedModule) {
+                trace(host, ts.Diagnostics.Module_name_0_was_successfully_resolved_to_1, moduleName, result.resolvedModule.resolvedFileName);
+            }
+            else {
+                trace(host, ts.Diagnostics.Module_name_0_was_not_resolved, moduleName);
+            }
+        }
+        return result;
+    }
+    ts.resolveModuleName = resolveModuleName;
+    /**
+     * Any module resolution kind can be augmented with optional settings: 'baseUrl', 'paths' and 'rootDirs' - they are used to
+     * mitigate differences between design time structure of the project and its runtime counterpart so the same import name
+     * can be resolved successfully by TypeScript compiler and runtime module loader.
+     * If these settings are set then loading procedure will try to use them to resolve module name and it can of failure it will
+     * fallback to standard resolution routine.
+     *
+     * - baseUrl - this setting controls how non-relative module names are resolved. If this setting is specified then non-relative
+     * names will be resolved relative to baseUrl: i.e. if baseUrl is '/a/b' then candidate location to resolve module name 'c/d' will
+     * be '/a/b/c/d'
+     * - paths - this setting can only be used when baseUrl is specified. allows to tune how non-relative module names
+     * will be resolved based on the content of the module name.
+     * Structure of 'paths' compiler options
+     * 'paths': {
+     *    pattern-1: [...substitutions],
+     *    pattern-2: [...substitutions],
+     *    ...
+     *    pattern-n: [...substitutions]
+     * }
+     * Pattern here is a string that can contain zero or one '*' character. During module resolution module name will be matched against
+     * all patterns in the list. Matching for patterns that don't contain '*' means that module name must be equal to pattern respecting the case.
+     * If pattern contains '*' then to match pattern "<prefix>*<suffix>" module name must start with the <prefix> and end with <suffix>.
+     * <MatchedStar> denotes part of the module name between <prefix> and <suffix>.
+     * If module name can be matches with multiple patterns then pattern with the longest prefix will be picked.
+     * After selecting pattern we'll use list of substitutions to get candidate locations of the module and the try to load module
+     * from the candidate location.
+     * Substitution is a string that can contain zero or one '*'. To get candidate location from substitution we'll pick every
+     * substitution in the list and replace '*' with <MatchedStar> string. If candidate location is not rooted it
+     * will be converted to absolute using baseUrl.
+     * For example:
+     * baseUrl: /a/b/c
+     * "paths": {
+     *     // match all module names
+     *     "*": [
+     *         "*",        // use matched name as is,
+     *                     // <matched name> will be looked as /a/b/c/<matched name>
+     *
+     *         "folder1/*" // substitution will convert matched name to 'folder1/<matched name>',
+     *                     // since it is not rooted then final candidate location will be /a/b/c/folder1/<matched name>
+     *     ],
+     *     // match module names that start with 'components/'
+     *     "components/*": [ "/root/components/*" ] // substitution will convert /components/folder1/<matched name> to '/root/components/folder1/<matched name>',
+     *                                              // it is rooted so it will be final candidate location
+     * }
+     *
+     * 'rootDirs' allows the project to be spreaded across multiple locations and resolve modules with relative names as if
+     * they were in the same location. For example lets say there are two files
+     * '/local/src/content/file1.ts'
+     * '/shared/components/contracts/src/content/protocols/file2.ts'
+     * After bundling content of '/shared/components/contracts/src' will be merged with '/local/src' so
+     * if file1 has the following import 'import {x} from "./protocols/file2"' it will be resolved successfully in runtime.
+     * 'rootDirs' provides the way to tell compiler that in order to get the whole project it should behave as if content of all
+     * root dirs were merged together.
+     * I.e. for the example above 'rootDirs' will have two entries: [ '/local/src', '/shared/components/contracts/src' ].
+     * Compiler will first convert './protocols/file2' into absolute path relative to the location of containing file:
+     * '/local/src/content/protocols/file2' and try to load it - failure.
+     * Then it will search 'rootDirs' looking for a longest matching prefix of this absolute path and if such prefix is found - absolute path will
+     * be converted to a path relative to found rootDir entry './content/protocols/file2' (*). As a last step compiler will check all remaining
+     * entries in 'rootDirs', use them to build absolute path out of (*) and try to resolve module from this location.
+     */
+    function tryLoadModuleUsingOptionalResolutionSettings(extensions, moduleName, containingDirectory, loader, failedLookupLocations, state) {
+        if (!ts.isExternalModuleNameRelative(moduleName)) {
+            return tryLoadModuleUsingBaseUrl(extensions, moduleName, loader, failedLookupLocations, state);
+        }
+        else {
+            return tryLoadModuleUsingRootDirs(extensions, moduleName, containingDirectory, loader, failedLookupLocations, state);
+        }
+    }
+    function tryLoadModuleUsingRootDirs(extensions, moduleName, containingDirectory, loader, failedLookupLocations, state) {
+        if (!state.compilerOptions.rootDirs) {
+            return undefined;
+        }
+        if (state.traceEnabled) {
+            trace(state.host, ts.Diagnostics.rootDirs_option_is_set_using_it_to_resolve_relative_module_name_0, moduleName);
+        }
+        var candidate = ts.normalizePath(ts.combinePaths(containingDirectory, moduleName));
+        var matchedRootDir;
+        var matchedNormalizedPrefix;
+        for (var _i = 0, _a = state.compilerOptions.rootDirs; _i < _a.length; _i++) {
+            var rootDir = _a[_i];
+            // rootDirs are expected to be absolute
+            // in case of tsconfig.json this will happen automatically - compiler will expand relative names
+            // using location of tsconfig.json as base location
+            var normalizedRoot = ts.normalizePath(rootDir);
+            if (!ts.endsWith(normalizedRoot, ts.directorySeparator)) {
+                normalizedRoot += ts.directorySeparator;
+            }
+            var isLongestMatchingPrefix = ts.startsWith(candidate, normalizedRoot) &&
+                (matchedNormalizedPrefix === undefined || matchedNormalizedPrefix.length < normalizedRoot.length);
+            if (state.traceEnabled) {
+                trace(state.host, ts.Diagnostics.Checking_if_0_is_the_longest_matching_prefix_for_1_2, normalizedRoot, candidate, isLongestMatchingPrefix);
+            }
+            if (isLongestMatchingPrefix) {
+                matchedNormalizedPrefix = normalizedRoot;
+                matchedRootDir = rootDir;
+            }
+        }
+        if (matchedNormalizedPrefix) {
+            if (state.traceEnabled) {
+                trace(state.host, ts.Diagnostics.Longest_matching_prefix_for_0_is_1, candidate, matchedNormalizedPrefix);
+            }
+            var suffix = candidate.substr(matchedNormalizedPrefix.length);
+            // first - try to load from a initial location
+            if (state.traceEnabled) {
+                trace(state.host, ts.Diagnostics.Loading_0_from_the_root_dir_1_candidate_location_2, suffix, matchedNormalizedPrefix, candidate);
+            }
+            var resolvedFileName = loader(extensions, candidate, failedLookupLocations, !directoryProbablyExists(containingDirectory, state.host), state);
+            if (resolvedFileName) {
+                return resolvedFileName;
+            }
+            if (state.traceEnabled) {
+                trace(state.host, ts.Diagnostics.Trying_other_entries_in_rootDirs);
+            }
+            // then try to resolve using remaining entries in rootDirs
+            for (var _b = 0, _c = state.compilerOptions.rootDirs; _b < _c.length; _b++) {
+                var rootDir = _c[_b];
+                if (rootDir === matchedRootDir) {
+                    // skip the initially matched entry
+                    continue;
+                }
+                var candidate_1 = ts.combinePaths(ts.normalizePath(rootDir), suffix);
+                if (state.traceEnabled) {
+                    trace(state.host, ts.Diagnostics.Loading_0_from_the_root_dir_1_candidate_location_2, suffix, rootDir, candidate_1);
+                }
+                var baseDirectory = ts.getDirectoryPath(candidate_1);
+                var resolvedFileName_1 = loader(extensions, candidate_1, failedLookupLocations, !directoryProbablyExists(baseDirectory, state.host), state);
+                if (resolvedFileName_1) {
+                    return resolvedFileName_1;
+                }
+            }
+            if (state.traceEnabled) {
+                trace(state.host, ts.Diagnostics.Module_resolution_using_rootDirs_has_failed);
+            }
+        }
+        return undefined;
+    }
+    function tryLoadModuleUsingBaseUrl(extensions, moduleName, loader, failedLookupLocations, state) {
+        if (!state.compilerOptions.baseUrl) {
+            return undefined;
+        }
+        if (state.traceEnabled) {
+            trace(state.host, ts.Diagnostics.baseUrl_option_is_set_to_0_using_this_value_to_resolve_non_relative_module_name_1, state.compilerOptions.baseUrl, moduleName);
+        }
+        // string is for exact match
+        var matchedPattern;
+        if (state.compilerOptions.paths) {
+            if (state.traceEnabled) {
+                trace(state.host, ts.Diagnostics.paths_option_is_specified_looking_for_a_pattern_to_match_module_name_0, moduleName);
+            }
+            matchedPattern = ts.matchPatternOrExact(ts.getOwnKeys(state.compilerOptions.paths), moduleName);
+        }
+        if (matchedPattern) {
+            var matchedStar_1 = ts.isString(matchedPattern) ? undefined : ts.matchedText(matchedPattern, moduleName);
+            var matchedPatternText = ts.isString(matchedPattern) ? matchedPattern : ts.patternText(matchedPattern);
+            if (state.traceEnabled) {
+                trace(state.host, ts.Diagnostics.Module_name_0_matched_pattern_1, moduleName, matchedPatternText);
+            }
+            return ts.forEach(state.compilerOptions.paths[matchedPatternText], function (subst) {
+                var path = matchedStar_1 ? subst.replace("*", matchedStar_1) : subst;
+                var candidate = ts.normalizePath(ts.combinePaths(state.compilerOptions.baseUrl, path));
+                if (state.traceEnabled) {
+                    trace(state.host, ts.Diagnostics.Trying_substitution_0_candidate_module_location_Colon_1, subst, path);
+                }
+                // A path mapping may have an extension, in contrast to an import, which should omit it.
+                var extension = ts.tryGetExtensionFromPath(candidate);
+                if (extension !== undefined) {
+                    var path_1 = tryFile(candidate, failedLookupLocations, /*onlyRecordFailures*/ false, state);
+                    if (path_1 !== undefined) {
+                        return noPackageId({ path: path_1, ext: extension });
+                    }
+                }
+                return loader(extensions, candidate, failedLookupLocations, !directoryProbablyExists(ts.getDirectoryPath(candidate), state.host), state);
+            });
+        }
+        else {
+            var candidate = ts.normalizePath(ts.combinePaths(state.compilerOptions.baseUrl, moduleName));
+            if (state.traceEnabled) {
+                trace(state.host, ts.Diagnostics.Resolving_module_name_0_relative_to_base_url_1_2, moduleName, state.compilerOptions.baseUrl, candidate);
+            }
+            return loader(extensions, candidate, failedLookupLocations, !directoryProbablyExists(ts.getDirectoryPath(candidate), state.host), state);
+        }
+    }
+    function nodeModuleNameResolver(moduleName, containingFile, compilerOptions, host, cache) {
+        return nodeModuleNameResolverWorker(moduleName, ts.getDirectoryPath(containingFile), compilerOptions, host, cache, /*jsOnly*/ false);
+    }
+    ts.nodeModuleNameResolver = nodeModuleNameResolver;
+    /**
+     * Expose resolution logic to allow us to use Node module resolution logic from arbitrary locations.
+     * No way to do this with `require()`: https://github.com/nodejs/node/issues/5963
+     * Throws an error if the module can't be resolved.
+     */
+    /* @internal */
+    function resolveJavaScriptModule(moduleName, initialDir, host) {
+        var _a = nodeModuleNameResolverWorker(moduleName, initialDir, { moduleResolution: ts.ModuleResolutionKind.NodeJs, allowJs: true }, host, /*cache*/ undefined, /*jsOnly*/ true), resolvedModule = _a.resolvedModule, failedLookupLocations = _a.failedLookupLocations;
+        if (!resolvedModule) {
+            throw new Error("Could not resolve JS module '" + moduleName + "' starting at '" + initialDir + "'. Looked in: " + failedLookupLocations.join(", "));
+        }
+        return resolvedModule.resolvedFileName;
+    }
+    ts.resolveJavaScriptModule = resolveJavaScriptModule;
+    function nodeModuleNameResolverWorker(moduleName, containingDirectory, compilerOptions, host, cache, jsOnly) {
+        var traceEnabled = isTraceEnabled(compilerOptions, host);
+        var failedLookupLocations = [];
+        var state = { compilerOptions: compilerOptions, host: host, traceEnabled: traceEnabled };
+        var result = jsOnly ?
+            tryResolve(Extensions.JavaScript) :
+            (tryResolve(Extensions.TypeScript) ||
+                tryResolve(Extensions.JavaScript) ||
+                (compilerOptions.resolveJsonModule ? tryResolve(Extensions.Json) : undefined));
+        if (result && result.value) {
+            var _a = result.value, resolved = _a.resolved, originalPath = _a.originalPath, isExternalLibraryImport = _a.isExternalLibraryImport;
+            return createResolvedModuleWithFailedLookupLocations(resolved, originalPath, isExternalLibraryImport, failedLookupLocations);
+        }
+        return { resolvedModule: undefined, failedLookupLocations: failedLookupLocations };
+        function tryResolve(extensions) {
+            var loader = function (extensions, candidate, failedLookupLocations, onlyRecordFailures, state) { return nodeLoadModuleByRelativeName(extensions, candidate, failedLookupLocations, onlyRecordFailures, state, /*considerPackageJson*/ true); };
+            var resolved = tryLoadModuleUsingOptionalResolutionSettings(extensions, moduleName, containingDirectory, loader, failedLookupLocations, state);
+            if (resolved) {
+                return toSearchResult({ resolved: resolved, isExternalLibraryImport: false });
+            }
+            if (!ts.isExternalModuleNameRelative(moduleName)) {
+                if (traceEnabled) {
+                    trace(host, ts.Diagnostics.Loading_module_0_from_node_modules_folder_target_file_type_1, moduleName, Extensions[extensions]);
+                }
+                var resolved_1 = loadModuleFromNodeModules(extensions, moduleName, containingDirectory, failedLookupLocations, state, cache);
+                if (!resolved_1)
+                    return undefined;
+                var resolvedValue = resolved_1.value;
+                var originalPath = void 0;
+                if (!compilerOptions.preserveSymlinks && resolvedValue) {
+                    originalPath = resolvedValue.path;
+                    var path = realPath(resolvedValue.path, host, traceEnabled);
+                    if (path === originalPath) {
+                        originalPath = undefined;
+                    }
+                    resolvedValue = __assign({}, resolvedValue, { path: path });
+                }
+                // For node_modules lookups, get the real path so that multiple accesses to an `npm link`-ed module do not create duplicate files.
+                return { value: resolvedValue && { resolved: resolvedValue, originalPath: originalPath, isExternalLibraryImport: true } };
+            }
+            else {
+                var _a = ts.normalizePathAndParts(ts.combinePaths(containingDirectory, moduleName)), candidate = _a.path, parts = _a.parts;
+                var resolved_2 = nodeLoadModuleByRelativeName(extensions, candidate, failedLookupLocations, /*onlyRecordFailures*/ false, state, /*considerPackageJson*/ true);
+                // Treat explicit "node_modules" import as an external library import.
+                return resolved_2 && toSearchResult({ resolved: resolved_2, isExternalLibraryImport: ts.contains(parts, "node_modules") });
+            }
+        }
+    }
+    function realPath(path, host, traceEnabled) {
+        if (!host.realpath) {
+            return path;
+        }
+        var real = ts.normalizePath(host.realpath(path));
+        if (traceEnabled) {
+            trace(host, ts.Diagnostics.Resolving_real_path_for_0_result_1, path, real);
+        }
+        ts.Debug.assert(host.fileExists(real), path + " linked to nonexistent file " + real); // tslint:disable-line
+        return real;
+    }
+    function nodeLoadModuleByRelativeName(extensions, candidate, failedLookupLocations, onlyRecordFailures, state, considerPackageJson) {
+        if (state.traceEnabled) {
+            trace(state.host, ts.Diagnostics.Loading_module_as_file_Slash_folder_candidate_module_location_0_target_file_type_1, candidate, Extensions[extensions]);
+        }
+        if (!ts.hasTrailingDirectorySeparator(candidate)) {
+            if (!onlyRecordFailures) {
+                var parentOfCandidate = ts.getDirectoryPath(candidate);
+                if (!directoryProbablyExists(parentOfCandidate, state.host)) {
+                    if (state.traceEnabled) {
+                        trace(state.host, ts.Diagnostics.Directory_0_does_not_exist_skipping_all_lookups_in_it, parentOfCandidate);
+                    }
+                    onlyRecordFailures = true;
+                }
+            }
+            var resolvedFromFile = loadModuleFromFile(extensions, candidate, failedLookupLocations, onlyRecordFailures, state);
+            if (resolvedFromFile) {
+                var nm = considerPackageJson ? parseNodeModuleFromPath(resolvedFromFile) : undefined;
+                var packageId = nm && getPackageJsonInfo(nm.packageDirectory, nm.subModuleName, failedLookupLocations, /*onlyRecordFailures*/ false, state).packageId;
+                return withPackageId(packageId, resolvedFromFile);
+            }
+        }
+        if (!onlyRecordFailures) {
+            var candidateExists = directoryProbablyExists(candidate, state.host);
+            if (!candidateExists) {
+                if (state.traceEnabled) {
+                    trace(state.host, ts.Diagnostics.Directory_0_does_not_exist_skipping_all_lookups_in_it, candidate);
+                }
+                onlyRecordFailures = true;
+            }
+        }
+        return loadNodeModuleFromDirectory(extensions, candidate, failedLookupLocations, onlyRecordFailures, state, considerPackageJson);
+    }
+    var nodeModulesPathPart = "/node_modules/";
+    /**
+     * This will be called on the successfully resolved path from `loadModuleFromFile`.
+     * (Not neeeded for `loadModuleFromNodeModules` as that looks up the `package.json` as part of resolution.)
+     *
+     * packageDirectory is the directory of the package itself.
+     * subModuleName is the path within the package.
+     *   For `blah/node_modules/foo/index.d.ts` this is { packageDirectory: "foo", subModuleName: "index.d.ts" }. (Part before "/node_modules/" is ignored.)
+     *   For `/node_modules/foo/bar.d.ts` this is { packageDirectory: "foo", subModuleName": "bar/index.d.ts" }.
+     *   For `/node_modules/@types/foo/bar/index.d.ts` this is { packageDirectory: "@types/foo", subModuleName: "bar/index.d.ts" }.
+     *   For `/node_modules/foo/bar/index.d.ts` this is { packageDirectory: "foo", subModuleName": "bar/index.d.ts" }.
+     */
+    function parseNodeModuleFromPath(resolved) {
+        var path = ts.normalizePath(resolved.path);
+        var idx = path.lastIndexOf(nodeModulesPathPart);
+        if (idx === -1) {
+            return undefined;
+        }
+        var indexAfterNodeModules = idx + nodeModulesPathPart.length;
+        var indexAfterPackageName = moveToNextDirectorySeparatorIfAvailable(path, indexAfterNodeModules);
+        if (path.charCodeAt(indexAfterNodeModules) === 64 /* at */) {
+            indexAfterPackageName = moveToNextDirectorySeparatorIfAvailable(path, indexAfterPackageName);
+        }
+        var packageDirectory = path.slice(0, indexAfterPackageName);
+        var subModuleName = ts.removeExtension(path.slice(indexAfterPackageName + 1), resolved.ext) + ".d.ts" /* Dts */;
+        return { packageDirectory: packageDirectory, subModuleName: subModuleName };
+    }
+    function moveToNextDirectorySeparatorIfAvailable(path, prevSeparatorIndex) {
+        var nextSeparatorIndex = path.indexOf(ts.directorySeparator, prevSeparatorIndex + 1);
+        return nextSeparatorIndex === -1 ? prevSeparatorIndex : nextSeparatorIndex;
+    }
+    function addExtensionAndIndex(path) {
+        if (path === "") {
+            return "index.d.ts";
+        }
+        if (ts.endsWith(path, ".d.ts")) {
+            return path;
+        }
+        if (ts.endsWith(path, "/index")) {
+            return path + ".d.ts";
+        }
+        return path + "/index.d.ts";
+    }
+    /* @internal */
+    function directoryProbablyExists(directoryName, host) {
+        // if host does not support 'directoryExists' assume that directory will exist
+        return !host.directoryExists || host.directoryExists(directoryName);
+    }
+    ts.directoryProbablyExists = directoryProbablyExists;
+    function loadModuleFromFileNoPackageId(extensions, candidate, failedLookupLocations, onlyRecordFailures, state) {
+        return noPackageId(loadModuleFromFile(extensions, candidate, failedLookupLocations, onlyRecordFailures, state));
+    }
+    /**
+     * @param {boolean} onlyRecordFailures - if true then function won't try to actually load files but instead record all attempts as failures. This flag is necessary
+     * in cases when we know upfront that all load attempts will fail (because containing folder does not exists) however we still need to record all failed lookup locations.
+     */
+    function loadModuleFromFile(extensions, candidate, failedLookupLocations, onlyRecordFailures, state) {
+        if (extensions === Extensions.Json) {
+            var extensionLess = ts.tryRemoveExtension(candidate, ".json" /* Json */);
+            return extensionLess === undefined ? undefined : tryAddingExtensions(extensionLess, extensions, failedLookupLocations, onlyRecordFailures, state);
+        }
+        // First, try adding an extension. An import of "foo" could be matched by a file "foo.ts", or "foo.js" by "foo.js.ts"
+        var resolvedByAddingExtension = tryAddingExtensions(candidate, extensions, failedLookupLocations, onlyRecordFailures, state);
+        if (resolvedByAddingExtension) {
+            return resolvedByAddingExtension;
+        }
+        // If that didn't work, try stripping a ".js" or ".jsx" extension and replacing it with a TypeScript one;
+        // e.g. "./foo.js" can be matched by "./foo.ts" or "./foo.d.ts"
+        if (ts.hasJavaScriptFileExtension(candidate)) {
+            var extensionless = ts.removeFileExtension(candidate);
+            if (state.traceEnabled) {
+                var extension = candidate.substring(extensionless.length);
+                trace(state.host, ts.Diagnostics.File_name_0_has_a_1_extension_stripping_it, candidate, extension);
+            }
+            return tryAddingExtensions(extensionless, extensions, failedLookupLocations, onlyRecordFailures, state);
+        }
+    }
+    /** Try to return an existing file that adds one of the `extensions` to `candidate`. */
+    function tryAddingExtensions(candidate, extensions, failedLookupLocations, onlyRecordFailures, state) {
+        if (!onlyRecordFailures) {
+            // check if containing folder exists - if it doesn't then just record failures for all supported extensions without disk probing
+            var directory = ts.getDirectoryPath(candidate);
+            if (directory) {
+                onlyRecordFailures = !directoryProbablyExists(directory, state.host);
+            }
+        }
+        switch (extensions) {
+            case Extensions.DtsOnly:
+                return tryExtension(".d.ts" /* Dts */);
+            case Extensions.TypeScript:
+                return tryExtension(".ts" /* Ts */) || tryExtension(".tsx" /* Tsx */) || tryExtension(".d.ts" /* Dts */);
+            case Extensions.JavaScript:
+                return tryExtension(".js" /* Js */) || tryExtension(".jsx" /* Jsx */);
+            case Extensions.Json:
+                return tryExtension(".json" /* Json */);
+        }
+        function tryExtension(ext) {
+            var path = tryFile(candidate + ext, failedLookupLocations, onlyRecordFailures, state);
+            return path === undefined ? undefined : { path: path, ext: ext };
+        }
+    }
+    /** Return the file if it exists. */
+    function tryFile(fileName, failedLookupLocations, onlyRecordFailures, state) {
+        if (!onlyRecordFailures) {
+            if (state.host.fileExists(fileName)) {
+                if (state.traceEnabled) {
+                    trace(state.host, ts.Diagnostics.File_0_exist_use_it_as_a_name_resolution_result, fileName);
+                }
+                return fileName;
+            }
+            else {
+                if (state.traceEnabled) {
+                    trace(state.host, ts.Diagnostics.File_0_does_not_exist, fileName);
+                }
+            }
+        }
+        failedLookupLocations.push(fileName);
+        return undefined;
+    }
+    function loadNodeModuleFromDirectory(extensions, candidate, failedLookupLocations, onlyRecordFailures, state, considerPackageJson) {
+        if (considerPackageJson === void 0) { considerPackageJson = true; }
+        var _a = considerPackageJson
+            ? getPackageJsonInfo(candidate, "", failedLookupLocations, onlyRecordFailures, state)
+            : { packageJsonContent: undefined, packageId: undefined }, packageJsonContent = _a.packageJsonContent, packageId = _a.packageId;
+        return withPackageId(packageId, loadNodeModuleFromDirectoryWorker(extensions, candidate, failedLookupLocations, onlyRecordFailures, state, packageJsonContent));
+    }
+    function loadNodeModuleFromDirectoryWorker(extensions, candidate, failedLookupLocations, onlyRecordFailures, state, packageJsonContent) {
+        var fromPackageJson = packageJsonContent && loadModuleFromPackageJson(packageJsonContent, extensions, candidate, failedLookupLocations, state);
+        if (fromPackageJson) {
+            return fromPackageJson;
+        }
+        var directoryExists = !onlyRecordFailures && directoryProbablyExists(candidate, state.host);
+        return loadModuleFromFile(extensions, ts.combinePaths(candidate, "index"), failedLookupLocations, !directoryExists, state);
+    }
+    function getPackageJsonInfo(nodeModuleDirectory, subModuleName, failedLookupLocations, onlyRecordFailures, state) {
+        var host = state.host, traceEnabled = state.traceEnabled;
+        var directoryExists = !onlyRecordFailures && directoryProbablyExists(nodeModuleDirectory, host);
+        var packageJsonPath = pathToPackageJson(nodeModuleDirectory);
+        if (directoryExists && host.fileExists(packageJsonPath)) {
+            var packageJsonContent = readJson(packageJsonPath, host);
+            if (subModuleName === "") { // looking up the root - need to handle types/typings/main redirects for subModuleName
+                var path = tryReadPackageJsonFields(/*readTypes*/ true, packageJsonContent, nodeModuleDirectory, state);
+                if (typeof path === "string") {
+                    subModuleName = addExtensionAndIndex(path.substring(nodeModuleDirectory.length + 1));
+                }
+                else {
+                    var jsPath = tryReadPackageJsonFields(/*readTypes*/ false, packageJsonContent, nodeModuleDirectory, state);
+                    if (typeof jsPath === "string" && jsPath.length > nodeModuleDirectory.length) {
+                        var potentialSubModule_1 = jsPath.substring(nodeModuleDirectory.length + 1);
+                        subModuleName = (ts.forEach(ts.supportedJavascriptExtensions, function (extension) {
+                            return ts.tryRemoveExtension(potentialSubModule_1, extension);
+                        }) || potentialSubModule_1) + ".d.ts" /* Dts */;
+                    }
+                    else {
+                        subModuleName = "index.d.ts";
+                    }
+                }
+            }
+            if (!ts.endsWith(subModuleName, ".d.ts" /* Dts */)) {
+                subModuleName = addExtensionAndIndex(subModuleName);
+            }
+            var packageId = typeof packageJsonContent.name === "string" && typeof packageJsonContent.version === "string"
+                ? { name: packageJsonContent.name, subModuleName: subModuleName, version: packageJsonContent.version }
+                : undefined;
+            if (traceEnabled) {
+                if (packageId) {
+                    trace(host, ts.Diagnostics.Found_package_json_at_0_Package_ID_is_1, packageJsonPath, ts.packageIdToString(packageId));
+                }
+                else {
+                    trace(host, ts.Diagnostics.Found_package_json_at_0, packageJsonPath);
+                }
+            }
+            return { found: true, packageJsonContent: packageJsonContent, packageId: packageId };
+        }
+        else {
+            if (directoryExists && traceEnabled) {
+                trace(host, ts.Diagnostics.File_0_does_not_exist, packageJsonPath);
+            }
+            // record package json as one of failed lookup locations - in the future if this file will appear it will invalidate resolution results
+            failedLookupLocations.push(packageJsonPath);
+            return { found: false, packageJsonContent: undefined, packageId: undefined };
+        }
+    }
+    function loadModuleFromPackageJson(jsonContent, extensions, candidate, failedLookupLocations, state) {
+        var file = tryReadPackageJsonFields(extensions !== Extensions.JavaScript && extensions !== Extensions.Json, jsonContent, candidate, state);
+        if (!file) {
+            if (extensions === Extensions.TypeScript) {
+                // When resolving typescript modules, try resolving using main field as well
+                file = tryReadPackageJsonFields(/*readTypes*/ false, jsonContent, candidate, state);
+                if (!file) {
+                    return undefined;
+                }
+            }
+            else {
+                return undefined;
+            }
+        }
+        var onlyRecordFailures = !directoryProbablyExists(ts.getDirectoryPath(file), state.host);
+        var fromFile = tryFile(file, failedLookupLocations, onlyRecordFailures, state);
+        if (fromFile) {
+            var resolved = resolvedIfExtensionMatches(extensions, fromFile);
+            if (resolved) {
+                return resolved;
+            }
+            if (state.traceEnabled) {
+                trace(state.host, ts.Diagnostics.File_0_has_an_unsupported_extension_so_skipping_it, fromFile);
+            }
+        }
+        // Even if extensions is DtsOnly, we can still look up a .ts file as a result of package.json "types"
+        var nextExtensions = extensions === Extensions.DtsOnly ? Extensions.TypeScript : extensions;
+        // Don't do package.json lookup recursively, because Node.js' package lookup doesn't.
+        var result = nodeLoadModuleByRelativeName(nextExtensions, file, failedLookupLocations, onlyRecordFailures, state, /*considerPackageJson*/ false);
+        if (result) {
+            // It won't have a `packageId` set, because we disabled `considerPackageJson`.
+            ts.Debug.assert(result.packageId === undefined);
+            return { path: result.path, ext: result.extension };
+        }
+    }
+    /** Resolve from an arbitrarily specified file. Return `undefined` if it has an unsupported extension. */
+    function resolvedIfExtensionMatches(extensions, path) {
+        var ext = ts.tryGetExtensionFromPath(path);
+        return ext !== undefined && extensionIsOk(extensions, ext) ? { path: path, ext: ext } : undefined;
+    }
+    /** True if `extension` is one of the supported `extensions`. */
+    function extensionIsOk(extensions, extension) {
+        switch (extensions) {
+            case Extensions.JavaScript:
+                return extension === ".js" /* Js */ || extension === ".jsx" /* Jsx */;
+            case Extensions.Json:
+                return extension === ".json" /* Json */;
+            case Extensions.TypeScript:
+                return extension === ".ts" /* Ts */ || extension === ".tsx" /* Tsx */ || extension === ".d.ts" /* Dts */;
+            case Extensions.DtsOnly:
+                return extension === ".d.ts" /* Dts */;
+        }
+    }
+    function pathToPackageJson(directory) {
+        return ts.combinePaths(directory, "package.json");
+    }
+    function loadModuleFromNodeModulesFolder(extensions, moduleName, nodeModulesFolder, nodeModulesFolderExists, failedLookupLocations, state) {
+        var candidate = ts.normalizePath(ts.combinePaths(nodeModulesFolder, moduleName));
+        // First look for a nested package.json, as in `node_modules/foo/bar/package.json`.
+        var packageJsonContent;
+        var packageId;
+        var packageInfo = getPackageJsonInfo(candidate, "", failedLookupLocations, /*onlyRecordFailures*/ !nodeModulesFolderExists, state);
+        if (packageInfo.found) {
+            (packageJsonContent = packageInfo.packageJsonContent, packageId = packageInfo.packageId);
+        }
+        else {
+            var _a = getPackageName(moduleName), packageName = _a.packageName, rest = _a.rest;
+            if (rest !== "") { // If "rest" is empty, we just did this search above.
+                var packageRootPath = ts.combinePaths(nodeModulesFolder, packageName);
+                // Don't use a "types" or "main" from here because we're not loading the root, but a subdirectory -- just here for the packageId.
+                packageId = getPackageJsonInfo(packageRootPath, rest, failedLookupLocations, !nodeModulesFolderExists, state).packageId;
+            }
+        }
+        var pathAndExtension = loadModuleFromFile(extensions, candidate, failedLookupLocations, !nodeModulesFolderExists, state) ||
+            loadNodeModuleFromDirectoryWorker(extensions, candidate, failedLookupLocations, !nodeModulesFolderExists, state, packageJsonContent);
+        return withPackageId(packageId, pathAndExtension);
+    }
+    /* @internal */
+    function getPackageName(moduleName) {
+        var idx = moduleName.indexOf(ts.directorySeparator);
+        if (moduleName[0] === "@") {
+            idx = moduleName.indexOf(ts.directorySeparator, idx + 1);
+        }
+        return idx === -1 ? { packageName: moduleName, rest: "" } : { packageName: moduleName.slice(0, idx), rest: moduleName.slice(idx + 1) };
+    }
+    ts.getPackageName = getPackageName;
+    function loadModuleFromNodeModules(extensions, moduleName, directory, failedLookupLocations, state, cache) {
+        return loadModuleFromNodeModulesWorker(extensions, moduleName, directory, failedLookupLocations, state, /*typesOnly*/ false, cache);
+    }
+    function loadModuleFromNodeModulesAtTypes(moduleName, directory, failedLookupLocations, state) {
+        // Extensions parameter here doesn't actually matter, because typesOnly ensures we're just doing @types lookup, which is always DtsOnly.
+        return loadModuleFromNodeModulesWorker(Extensions.DtsOnly, moduleName, directory, failedLookupLocations, state, /*typesOnly*/ true, /*cache*/ undefined);
+    }
+    function loadModuleFromNodeModulesWorker(extensions, moduleName, directory, failedLookupLocations, state, typesOnly, cache) {
+        var perModuleNameCache = cache && cache.getOrCreateCacheForModuleName(moduleName);
+        return ts.forEachAncestorDirectory(ts.normalizeSlashes(directory), function (ancestorDirectory) {
+            if (ts.getBaseFileName(ancestorDirectory) !== "node_modules") {
+                var resolutionFromCache = tryFindNonRelativeModuleNameInCache(perModuleNameCache, moduleName, ancestorDirectory, state.traceEnabled, state.host, failedLookupLocations);
+                if (resolutionFromCache) {
+                    return resolutionFromCache;
+                }
+                return toSearchResult(loadModuleFromNodeModulesOneLevel(extensions, moduleName, ancestorDirectory, failedLookupLocations, state, typesOnly));
+            }
+        });
+    }
+    /** Load a module from a single node_modules directory, but not from any ancestors' node_modules directories. */
+    function loadModuleFromNodeModulesOneLevel(extensions, moduleName, directory, failedLookupLocations, state, typesOnly) {
+        if (typesOnly === void 0) { typesOnly = false; }
+        var nodeModulesFolder = ts.combinePaths(directory, "node_modules");
+        var nodeModulesFolderExists = directoryProbablyExists(nodeModulesFolder, state.host);
+        if (!nodeModulesFolderExists && state.traceEnabled) {
+            trace(state.host, ts.Diagnostics.Directory_0_does_not_exist_skipping_all_lookups_in_it, nodeModulesFolder);
+        }
+        var packageResult = typesOnly ? undefined : loadModuleFromNodeModulesFolder(extensions, moduleName, nodeModulesFolder, nodeModulesFolderExists, failedLookupLocations, state);
+        if (packageResult) {
+            return packageResult;
+        }
+        if (extensions !== Extensions.JavaScript && extensions !== Extensions.Json) {
+            var nodeModulesAtTypes_1 = ts.combinePaths(nodeModulesFolder, "@types");
+            var nodeModulesAtTypesExists = nodeModulesFolderExists;
+            if (nodeModulesFolderExists && !directoryProbablyExists(nodeModulesAtTypes_1, state.host)) {
+                if (state.traceEnabled) {
+                    trace(state.host, ts.Diagnostics.Directory_0_does_not_exist_skipping_all_lookups_in_it, nodeModulesAtTypes_1);
+                }
+                nodeModulesAtTypesExists = false;
+            }
+            return loadModuleFromNodeModulesFolder(Extensions.DtsOnly, mangleScopedPackage(moduleName, state), nodeModulesAtTypes_1, nodeModulesAtTypesExists, failedLookupLocations, state);
+        }
+    }
+    /** Double underscores are used in DefinitelyTyped to delimit scoped packages. */
+    var mangledScopedPackageSeparator = "__";
+    /** For a scoped package, we must look in `@types/foo__bar` instead of `@types/@foo/bar`. */
+    function mangleScopedPackage(packageName, state) {
+        var mangled = getMangledNameForScopedPackage(packageName);
+        if (state.traceEnabled && mangled !== packageName) {
+            trace(state.host, ts.Diagnostics.Scoped_package_detected_looking_in_0, mangled);
+        }
+        return mangled;
+    }
+    /* @internal */
+    function getTypesPackageName(packageName) {
+        return "@types/" + getMangledNameForScopedPackage(packageName);
+    }
+    ts.getTypesPackageName = getTypesPackageName;
+    /* @internal */
+    function getMangledNameForScopedPackage(packageName) {
+        if (ts.startsWith(packageName, "@")) {
+            var replaceSlash = packageName.replace(ts.directorySeparator, mangledScopedPackageSeparator);
+            if (replaceSlash !== packageName) {
+                return replaceSlash.slice(1); // Take off the "@"
+            }
+        }
+        return packageName;
+    }
+    ts.getMangledNameForScopedPackage = getMangledNameForScopedPackage;
+    /* @internal */
+    function getPackageNameFromAtTypesDirectory(mangledName) {
+        var withoutAtTypePrefix = ts.removePrefix(mangledName, "@types/");
+        if (withoutAtTypePrefix !== mangledName) {
+            return getUnmangledNameForScopedPackage(withoutAtTypePrefix);
+        }
+        return mangledName;
+    }
+    ts.getPackageNameFromAtTypesDirectory = getPackageNameFromAtTypesDirectory;
+    /* @internal */
+    function getUnmangledNameForScopedPackage(typesPackageName) {
+        return ts.stringContains(typesPackageName, mangledScopedPackageSeparator) ?
+            "@" + typesPackageName.replace(mangledScopedPackageSeparator, ts.directorySeparator) :
+            typesPackageName;
+    }
+    ts.getUnmangledNameForScopedPackage = getUnmangledNameForScopedPackage;
+    function tryFindNonRelativeModuleNameInCache(cache, moduleName, containingDirectory, traceEnabled, host, failedLookupLocations) {
+        var result = cache && cache.get(containingDirectory);
+        if (result) {
+            if (traceEnabled) {
+                trace(host, ts.Diagnostics.Resolution_for_module_0_was_found_in_cache_from_location_1, moduleName, containingDirectory);
+            }
+            failedLookupLocations.push.apply(failedLookupLocations, result.failedLookupLocations);
+            return { value: result.resolvedModule && { path: result.resolvedModule.resolvedFileName, extension: result.resolvedModule.extension, packageId: result.resolvedModule.packageId } };
+        }
+    }
+    function classicNameResolver(moduleName, containingFile, compilerOptions, host, cache) {
+        var traceEnabled = isTraceEnabled(compilerOptions, host);
+        var state = { compilerOptions: compilerOptions, host: host, traceEnabled: traceEnabled };
+        var failedLookupLocations = [];
+        var containingDirectory = ts.getDirectoryPath(containingFile);
+        var resolved = tryResolve(Extensions.TypeScript) || tryResolve(Extensions.JavaScript);
+        // No originalPath because classic resolution doesn't resolve realPath
+        return createResolvedModuleWithFailedLookupLocations(resolved && resolved.value, /*originalPath*/ undefined, /*isExternalLibraryImport*/ false, failedLookupLocations);
+        function tryResolve(extensions) {
+            var resolvedUsingSettings = tryLoadModuleUsingOptionalResolutionSettings(extensions, moduleName, containingDirectory, loadModuleFromFileNoPackageId, failedLookupLocations, state);
+            if (resolvedUsingSettings) {
+                return { value: resolvedUsingSettings };
+            }
+            var perModuleNameCache = cache && cache.getOrCreateCacheForModuleName(moduleName);
+            if (!ts.isExternalModuleNameRelative(moduleName)) {
+                // Climb up parent directories looking for a module.
+                var resolved_3 = ts.forEachAncestorDirectory(containingDirectory, function (directory) {
+                    var resolutionFromCache = tryFindNonRelativeModuleNameInCache(perModuleNameCache, moduleName, directory, traceEnabled, host, failedLookupLocations);
+                    if (resolutionFromCache) {
+                        return resolutionFromCache;
+                    }
+                    var searchName = ts.normalizePath(ts.combinePaths(directory, moduleName));
+                    return toSearchResult(loadModuleFromFileNoPackageId(extensions, searchName, failedLookupLocations, /*onlyRecordFailures*/ false, state));
+                });
+                if (resolved_3) {
+                    return resolved_3;
+                }
+                if (extensions === Extensions.TypeScript) {
+                    // If we didn't find the file normally, look it up in @types.
+                    return loadModuleFromNodeModulesAtTypes(moduleName, containingDirectory, failedLookupLocations, state);
+                }
+            }
+            else {
+                var candidate = ts.normalizePath(ts.combinePaths(containingDirectory, moduleName));
+                return toSearchResult(loadModuleFromFileNoPackageId(extensions, candidate, failedLookupLocations, /*onlyRecordFailures*/ false, state));
+            }
+        }
+    }
+    ts.classicNameResolver = classicNameResolver;
+    /**
+     * LSHost may load a module from a global cache of typings.
+     * This is the minumum code needed to expose that functionality; the rest is in LSHost.
+     */
+    /* @internal */
+    function loadModuleFromGlobalCache(moduleName, projectName, compilerOptions, host, globalCache) {
+        var traceEnabled = isTraceEnabled(compilerOptions, host);
+        if (traceEnabled) {
+            trace(host, ts.Diagnostics.Auto_discovery_for_typings_is_enabled_in_project_0_Running_extra_resolution_pass_for_module_1_using_cache_location_2, projectName, moduleName, globalCache);
+        }
+        var state = { compilerOptions: compilerOptions, host: host, traceEnabled: traceEnabled };
+        var failedLookupLocations = [];
+        var resolved = loadModuleFromNodeModulesOneLevel(Extensions.DtsOnly, moduleName, globalCache, failedLookupLocations, state);
+        return createResolvedModuleWithFailedLookupLocations(resolved, /*originalPath*/ undefined, /*isExternalLibraryImport*/ true, failedLookupLocations);
+    }
+    ts.loadModuleFromGlobalCache = loadModuleFromGlobalCache;
+    /**
+     * Wraps value to SearchResult.
+     * @returns undefined if value is undefined or { value } otherwise
+     */
+    function toSearchResult(value) {
+        return value !== undefined ? { value: value } : undefined;
+    }
+})(ts || (ts = {}));
+//# sourceMappingURL=parser.js.map
+"use strict";
+var __assign = (this && this.__assign) || Object.assign || function(t) {
+    for (var s, i = 1, n = arguments.length; i < n; i++) {
+        s = arguments[i];
+        for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
+            t[p] = s[p];
+    }
+    return t;
+};
+var __makeTemplateObject = (this && this.__makeTemplateObject) || function (cooked, raw) {
+    if (Object.defineProperty) { Object.defineProperty(cooked, "raw", { value: raw }); } else { cooked.raw = raw; }
+    return cooked;
+};
 /* @internal */
 var ts;
 (function (ts) {
@@ -22025,7 +25554,7 @@ var ts;
             if (symbolFlags & 67216319 /* Value */) {
                 var valueDeclaration = symbol.valueDeclaration;
                 if (!valueDeclaration ||
-                    (valueDeclaration.kind !== node.kind && valueDeclaration.kind === 239 /* ModuleDeclaration */)) {
+                    (valueDeclaration.kind !== node.kind && ts.isEffectiveModuleDeclaration(valueDeclaration))) {
                     // other kinds of value declarations take precedence over modules
                     symbol.valueDeclaration = node;
                 }
@@ -22379,8 +25908,8 @@ var ts;
                 var savedSubtreeTransformFlags = subtreeTransformFlags;
                 subtreeTransformFlags = 0 /* None */;
                 var nodeArrayFlags = 0 /* None */;
-                for (var _i = 0, nodes_2 = nodes; _i < nodes_2.length; _i++) {
-                    var node = nodes_2[_i];
+                for (var _i = 0, nodes_1 = nodes; _i < nodes_1.length; _i++) {
+                    var node = nodes_1[_i];
                     bindFunction(node);
                     nodeArrayFlags |= node.transformFlags & ~536870912 /* HasComputedFlags */;
                 }
@@ -25405,1126 +28934,6 @@ var ts;
     }
     ts.createGetSymbolWalker = createGetSymbolWalker;
 })(ts || (ts = {}));
-var ts;
-(function (ts) {
-    function trace(host) {
-        host.trace(ts.formatMessage.apply(undefined, arguments));
-    }
-    ts.trace = trace;
-    /* @internal */
-    function isTraceEnabled(compilerOptions, host) {
-        return !!compilerOptions.traceResolution && host.trace !== undefined;
-    }
-    ts.isTraceEnabled = isTraceEnabled;
-    function withPackageId(packageId, r) {
-        return r && { path: r.path, extension: r.ext, packageId: packageId };
-    }
-    function noPackageId(r) {
-        return withPackageId(/*packageId*/ undefined, r);
-    }
-    /**
-     * Kinds of file that we are currently looking for.
-     * Typically there is one pass with Extensions.TypeScript, then a second pass with Extensions.JavaScript.
-     */
-    var Extensions;
-    (function (Extensions) {
-        Extensions[Extensions["TypeScript"] = 0] = "TypeScript";
-        Extensions[Extensions["JavaScript"] = 1] = "JavaScript";
-        Extensions[Extensions["Json"] = 2] = "Json";
-        Extensions[Extensions["DtsOnly"] = 3] = "DtsOnly"; /** Only '.d.ts' */
-    })(Extensions || (Extensions = {}));
-    /** Used with `Extensions.DtsOnly` to extract the path from TypeScript results. */
-    function resolvedTypeScriptOnly(resolved) {
-        if (!resolved) {
-            return undefined;
-        }
-        ts.Debug.assert(ts.extensionIsTypeScript(resolved.extension));
-        return { fileName: resolved.path, packageId: resolved.packageId };
-    }
-    function createResolvedModuleWithFailedLookupLocations(resolved, originalPath, isExternalLibraryImport, failedLookupLocations) {
-        return {
-            resolvedModule: resolved && { resolvedFileName: resolved.path, originalPath: originalPath, extension: resolved.extension, isExternalLibraryImport: isExternalLibraryImport, packageId: resolved.packageId },
-            failedLookupLocations: failedLookupLocations
-        };
-    }
-    /** Reads from "main" or "types"/"typings" depending on `extensions`. */
-    function tryReadPackageJsonFields(readTypes, jsonContent, baseDirectory, state) {
-        return readTypes ? tryReadFromField("typings") || tryReadFromField("types") : tryReadFromField("main");
-        function tryReadFromField(fieldName) {
-            if (!ts.hasProperty(jsonContent, fieldName)) {
-                if (state.traceEnabled) {
-                    trace(state.host, ts.Diagnostics.package_json_does_not_have_a_0_field, fieldName);
-                }
-                return;
-            }
-            var fileName = jsonContent[fieldName];
-            if (!ts.isString(fileName)) {
-                if (state.traceEnabled) {
-                    trace(state.host, ts.Diagnostics.Expected_type_of_0_field_in_package_json_to_be_string_got_1, fieldName, typeof fileName);
-                }
-                return;
-            }
-            var path = ts.normalizePath(ts.combinePaths(baseDirectory, fileName));
-            if (state.traceEnabled) {
-                trace(state.host, ts.Diagnostics.package_json_has_0_field_1_that_references_2, fieldName, fileName, path);
-            }
-            return path;
-        }
-    }
-    /* @internal */
-    function readJson(path, host) {
-        try {
-            var jsonText = host.readFile(path);
-            if (!jsonText)
-                return {};
-            var result = ts.parseConfigFileTextToJson(path, jsonText);
-            if (result.error) {
-                return {};
-            }
-            return result.config;
-        }
-        catch (e) {
-            // gracefully handle if readFile fails or returns not JSON
-            return {};
-        }
-    }
-    ts.readJson = readJson;
-    function getEffectiveTypeRoots(options, host) {
-        if (options.typeRoots) {
-            return options.typeRoots;
-        }
-        var currentDirectory;
-        if (options.configFilePath) {
-            currentDirectory = ts.getDirectoryPath(options.configFilePath);
-        }
-        else if (host.getCurrentDirectory) {
-            currentDirectory = host.getCurrentDirectory();
-        }
-        if (currentDirectory !== undefined) {
-            return getDefaultTypeRoots(currentDirectory, host);
-        }
-    }
-    ts.getEffectiveTypeRoots = getEffectiveTypeRoots;
-    /**
-     * Returns the path to every node_modules/@types directory from some ancestor directory.
-     * Returns undefined if there are none.
-     */
-    function getDefaultTypeRoots(currentDirectory, host) {
-        if (!host.directoryExists) {
-            return [ts.combinePaths(currentDirectory, nodeModulesAtTypes)];
-            // And if it doesn't exist, tough.
-        }
-        var typeRoots;
-        ts.forEachAncestorDirectory(ts.normalizePath(currentDirectory), function (directory) {
-            var atTypes = ts.combinePaths(directory, nodeModulesAtTypes);
-            if (host.directoryExists(atTypes)) {
-                (typeRoots || (typeRoots = [])).push(atTypes);
-            }
-            return undefined;
-        });
-        return typeRoots;
-    }
-    var nodeModulesAtTypes = ts.combinePaths("node_modules", "@types");
-    /**
-     * @param {string | undefined} containingFile - file that contains type reference directive, can be undefined if containing file is unknown.
-     * This is possible in case if resolution is performed for directives specified via 'types' parameter. In this case initial path for secondary lookups
-     * is assumed to be the same as root directory of the project.
-     */
-    function resolveTypeReferenceDirective(typeReferenceDirectiveName, containingFile, options, host) {
-        var traceEnabled = isTraceEnabled(options, host);
-        var moduleResolutionState = { compilerOptions: options, host: host, traceEnabled: traceEnabled };
-        var typeRoots = getEffectiveTypeRoots(options, host);
-        if (traceEnabled) {
-            if (containingFile === undefined) {
-                if (typeRoots === undefined) {
-                    trace(host, ts.Diagnostics.Resolving_type_reference_directive_0_containing_file_not_set_root_directory_not_set, typeReferenceDirectiveName);
-                }
-                else {
-                    trace(host, ts.Diagnostics.Resolving_type_reference_directive_0_containing_file_not_set_root_directory_1, typeReferenceDirectiveName, typeRoots);
-                }
-            }
-            else {
-                if (typeRoots === undefined) {
-                    trace(host, ts.Diagnostics.Resolving_type_reference_directive_0_containing_file_1_root_directory_not_set, typeReferenceDirectiveName, containingFile);
-                }
-                else {
-                    trace(host, ts.Diagnostics.Resolving_type_reference_directive_0_containing_file_1_root_directory_2, typeReferenceDirectiveName, containingFile, typeRoots);
-                }
-            }
-        }
-        var failedLookupLocations = [];
-        var resolved = primaryLookup();
-        var primary = true;
-        if (!resolved) {
-            resolved = secondaryLookup();
-            primary = false;
-        }
-        var resolvedTypeReferenceDirective;
-        if (resolved) {
-            if (!options.preserveSymlinks) {
-                resolved = __assign({}, resolved, { fileName: realPath(resolved.fileName, host, traceEnabled) });
-            }
-            if (traceEnabled) {
-                trace(host, ts.Diagnostics.Type_reference_directive_0_was_successfully_resolved_to_1_primary_Colon_2, typeReferenceDirectiveName, resolved.fileName, primary);
-            }
-            resolvedTypeReferenceDirective = { primary: primary, resolvedFileName: resolved.fileName, packageId: resolved.packageId };
-        }
-        return { resolvedTypeReferenceDirective: resolvedTypeReferenceDirective, failedLookupLocations: failedLookupLocations };
-        function primaryLookup() {
-            // Check primary library paths
-            if (typeRoots && typeRoots.length) {
-                if (traceEnabled) {
-                    trace(host, ts.Diagnostics.Resolving_with_primary_search_path_0, typeRoots.join(", "));
-                }
-                return ts.forEach(typeRoots, function (typeRoot) {
-                    var candidate = ts.combinePaths(typeRoot, typeReferenceDirectiveName);
-                    var candidateDirectory = ts.getDirectoryPath(candidate);
-                    var directoryExists = directoryProbablyExists(candidateDirectory, host);
-                    if (!directoryExists && traceEnabled) {
-                        trace(host, ts.Diagnostics.Directory_0_does_not_exist_skipping_all_lookups_in_it, candidateDirectory);
-                    }
-                    return resolvedTypeScriptOnly(loadNodeModuleFromDirectory(Extensions.DtsOnly, candidate, failedLookupLocations, !directoryExists, moduleResolutionState));
-                });
-            }
-            else {
-                if (traceEnabled) {
-                    trace(host, ts.Diagnostics.Root_directory_cannot_be_determined_skipping_primary_search_paths);
-                }
-            }
-        }
-        function secondaryLookup() {
-            var initialLocationForSecondaryLookup = containingFile && ts.getDirectoryPath(containingFile);
-            if (initialLocationForSecondaryLookup !== undefined) {
-                // check secondary locations
-                if (traceEnabled) {
-                    trace(host, ts.Diagnostics.Looking_up_in_node_modules_folder_initial_location_0, initialLocationForSecondaryLookup);
-                }
-                var result = loadModuleFromNodeModules(Extensions.DtsOnly, typeReferenceDirectiveName, initialLocationForSecondaryLookup, failedLookupLocations, moduleResolutionState, /*cache*/ undefined);
-                var resolvedFile = resolvedTypeScriptOnly(result && result.value);
-                if (!resolvedFile && traceEnabled) {
-                    trace(host, ts.Diagnostics.Type_reference_directive_0_was_not_resolved, typeReferenceDirectiveName);
-                }
-                return resolvedFile;
-            }
-            else {
-                if (traceEnabled) {
-                    trace(host, ts.Diagnostics.Containing_file_is_not_specified_and_root_directory_cannot_be_determined_skipping_lookup_in_node_modules_folder);
-                }
-            }
-        }
-    }
-    ts.resolveTypeReferenceDirective = resolveTypeReferenceDirective;
-    /**
-     * Given a set of options, returns the set of type directive names
-     *   that should be included for this program automatically.
-     * This list could either come from the config file,
-     *   or from enumerating the types root + initial secondary types lookup location.
-     * More type directives might appear in the program later as a result of loading actual source files;
-     *   this list is only the set of defaults that are implicitly included.
-     */
-    function getAutomaticTypeDirectiveNames(options, host) {
-        // Use explicit type list from tsconfig.json
-        if (options.types) {
-            return options.types;
-        }
-        // Walk the primary type lookup locations
-        var result = [];
-        if (host.directoryExists && host.getDirectories) {
-            var typeRoots = getEffectiveTypeRoots(options, host);
-            if (typeRoots) {
-                for (var _i = 0, typeRoots_1 = typeRoots; _i < typeRoots_1.length; _i++) {
-                    var root = typeRoots_1[_i];
-                    if (host.directoryExists(root)) {
-                        for (var _a = 0, _b = host.getDirectories(root); _a < _b.length; _a++) {
-                            var typeDirectivePath = _b[_a];
-                            var normalized = ts.normalizePath(typeDirectivePath);
-                            var packageJsonPath = pathToPackageJson(ts.combinePaths(root, normalized));
-                            // `types-publisher` sometimes creates packages with `"typings": null` for packages that don't provide their own types.
-                            // See `createNotNeededPackageJSON` in the types-publisher` repo.
-                            // tslint:disable-next-line:no-null-keyword
-                            var isNotNeededPackage = host.fileExists(packageJsonPath) && readJson(packageJsonPath, host).typings === null;
-                            if (!isNotNeededPackage) {
-                                // Return just the type directive names
-                                result.push(ts.getBaseFileName(normalized));
-                            }
-                        }
-                    }
-                }
-            }
-        }
-        return result;
-    }
-    ts.getAutomaticTypeDirectiveNames = getAutomaticTypeDirectiveNames;
-    function createModuleResolutionCache(currentDirectory, getCanonicalFileName) {
-        return createModuleResolutionCacheWithMaps(ts.createMap(), ts.createMap(), currentDirectory, getCanonicalFileName);
-    }
-    ts.createModuleResolutionCache = createModuleResolutionCache;
-    /*@internal*/
-    function createModuleResolutionCacheWithMaps(directoryToModuleNameMap, moduleNameToDirectoryMap, currentDirectory, getCanonicalFileName) {
-        return { getOrCreateCacheForDirectory: getOrCreateCacheForDirectory, getOrCreateCacheForModuleName: getOrCreateCacheForModuleName };
-        function getOrCreateCacheForDirectory(directoryName) {
-            var path = ts.toPath(directoryName, currentDirectory, getCanonicalFileName);
-            var perFolderCache = directoryToModuleNameMap.get(path);
-            if (!perFolderCache) {
-                perFolderCache = ts.createMap();
-                directoryToModuleNameMap.set(path, perFolderCache);
-            }
-            return perFolderCache;
-        }
-        function getOrCreateCacheForModuleName(nonRelativeModuleName) {
-            if (ts.isExternalModuleNameRelative(nonRelativeModuleName)) {
-                return undefined; // TODO: GH#18217
-            }
-            var perModuleNameCache = moduleNameToDirectoryMap.get(nonRelativeModuleName);
-            if (!perModuleNameCache) {
-                perModuleNameCache = createPerModuleNameCache();
-                moduleNameToDirectoryMap.set(nonRelativeModuleName, perModuleNameCache);
-            }
-            return perModuleNameCache;
-        }
-        function createPerModuleNameCache() {
-            var directoryPathMap = ts.createMap();
-            return { get: get, set: set };
-            function get(directory) {
-                return directoryPathMap.get(ts.toPath(directory, currentDirectory, getCanonicalFileName));
-            }
-            /**
-             * At first this function add entry directory -> module resolution result to the table.
-             * Then it computes the set of parent folders for 'directory' that should have the same module resolution result
-             * and for every parent folder in set it adds entry: parent -> module resolution. .
-             * Lets say we first directory name: /a/b/c/d/e and resolution result is: /a/b/bar.ts.
-             * Set of parent folders that should have the same result will be:
-             * [
-             *     /a/b/c/d, /a/b/c, /a/b
-             * ]
-             * this means that request for module resolution from file in any of these folder will be immediately found in cache.
-             */
-            function set(directory, result) {
-                var path = ts.toPath(directory, currentDirectory, getCanonicalFileName);
-                // if entry is already in cache do nothing
-                if (directoryPathMap.has(path)) {
-                    return;
-                }
-                directoryPathMap.set(path, result);
-                var resolvedFileName = result.resolvedModule && result.resolvedModule.resolvedFileName;
-                // find common prefix between directory and resolved file name
-                // this common prefix should be the shorted path that has the same resolution
-                // directory: /a/b/c/d/e
-                // resolvedFileName: /a/b/foo.d.ts
-                var commonPrefix = getCommonPrefix(path, resolvedFileName);
-                var current = path;
-                while (true) {
-                    var parent = ts.getDirectoryPath(current);
-                    if (parent === current || directoryPathMap.has(parent)) {
-                        break;
-                    }
-                    directoryPathMap.set(parent, result);
-                    current = parent;
-                    if (current === commonPrefix) {
-                        break;
-                    }
-                }
-            }
-            function getCommonPrefix(directory, resolution) {
-                if (resolution === undefined) {
-                    return undefined;
-                }
-                var resolutionDirectory = ts.toPath(ts.getDirectoryPath(resolution), currentDirectory, getCanonicalFileName);
-                // find first position where directory and resolution differs
-                var i = 0;
-                while (i < Math.min(directory.length, resolutionDirectory.length) && directory.charCodeAt(i) === resolutionDirectory.charCodeAt(i)) {
-                    i++;
-                }
-                // find last directory separator before position i
-                var sep = directory.lastIndexOf(ts.directorySeparator, i);
-                if (sep < 0) {
-                    return undefined;
-                }
-                return directory.substr(0, sep);
-            }
-        }
-    }
-    ts.createModuleResolutionCacheWithMaps = createModuleResolutionCacheWithMaps;
-    function resolveModuleNameFromCache(moduleName, containingFile, cache) {
-        var containingDirectory = ts.getDirectoryPath(containingFile);
-        var perFolderCache = cache && cache.getOrCreateCacheForDirectory(containingDirectory);
-        return perFolderCache && perFolderCache.get(moduleName);
-    }
-    ts.resolveModuleNameFromCache = resolveModuleNameFromCache;
-    function resolveModuleName(moduleName, containingFile, compilerOptions, host, cache) {
-        var traceEnabled = isTraceEnabled(compilerOptions, host);
-        if (traceEnabled) {
-            trace(host, ts.Diagnostics.Resolving_module_0_from_1, moduleName, containingFile);
-        }
-        var containingDirectory = ts.getDirectoryPath(containingFile);
-        var perFolderCache = cache && cache.getOrCreateCacheForDirectory(containingDirectory);
-        var result = perFolderCache && perFolderCache.get(moduleName);
-        if (result) {
-            if (traceEnabled) {
-                trace(host, ts.Diagnostics.Resolution_for_module_0_was_found_in_cache_from_location_1, moduleName, containingDirectory);
-            }
-        }
-        else {
-            var moduleResolution = compilerOptions.moduleResolution;
-            if (moduleResolution === undefined) {
-                moduleResolution = ts.getEmitModuleKind(compilerOptions) === ts.ModuleKind.CommonJS ? ts.ModuleResolutionKind.NodeJs : ts.ModuleResolutionKind.Classic;
-                if (traceEnabled) {
-                    trace(host, ts.Diagnostics.Module_resolution_kind_is_not_specified_using_0, ts.ModuleResolutionKind[moduleResolution]);
-                }
-            }
-            else {
-                if (traceEnabled) {
-                    trace(host, ts.Diagnostics.Explicitly_specified_module_resolution_kind_Colon_0, ts.ModuleResolutionKind[moduleResolution]);
-                }
-            }
-            switch (moduleResolution) {
-                case ts.ModuleResolutionKind.NodeJs:
-                    result = nodeModuleNameResolver(moduleName, containingFile, compilerOptions, host, cache);
-                    break;
-                case ts.ModuleResolutionKind.Classic:
-                    result = classicNameResolver(moduleName, containingFile, compilerOptions, host, cache);
-                    break;
-                default:
-                    return ts.Debug.fail("Unexpected moduleResolution: " + moduleResolution);
-            }
-            if (perFolderCache) {
-                perFolderCache.set(moduleName, result);
-                // put result in per-module name cache
-                var perModuleNameCache = cache.getOrCreateCacheForModuleName(moduleName);
-                if (perModuleNameCache) {
-                    perModuleNameCache.set(containingDirectory, result);
-                }
-            }
-        }
-        if (traceEnabled) {
-            if (result.resolvedModule) {
-                trace(host, ts.Diagnostics.Module_name_0_was_successfully_resolved_to_1, moduleName, result.resolvedModule.resolvedFileName);
-            }
-            else {
-                trace(host, ts.Diagnostics.Module_name_0_was_not_resolved, moduleName);
-            }
-        }
-        return result;
-    }
-    ts.resolveModuleName = resolveModuleName;
-    /**
-     * Any module resolution kind can be augmented with optional settings: 'baseUrl', 'paths' and 'rootDirs' - they are used to
-     * mitigate differences between design time structure of the project and its runtime counterpart so the same import name
-     * can be resolved successfully by TypeScript compiler and runtime module loader.
-     * If these settings are set then loading procedure will try to use them to resolve module name and it can of failure it will
-     * fallback to standard resolution routine.
-     *
-     * - baseUrl - this setting controls how non-relative module names are resolved. If this setting is specified then non-relative
-     * names will be resolved relative to baseUrl: i.e. if baseUrl is '/a/b' then candidate location to resolve module name 'c/d' will
-     * be '/a/b/c/d'
-     * - paths - this setting can only be used when baseUrl is specified. allows to tune how non-relative module names
-     * will be resolved based on the content of the module name.
-     * Structure of 'paths' compiler options
-     * 'paths': {
-     *    pattern-1: [...substitutions],
-     *    pattern-2: [...substitutions],
-     *    ...
-     *    pattern-n: [...substitutions]
-     * }
-     * Pattern here is a string that can contain zero or one '*' character. During module resolution module name will be matched against
-     * all patterns in the list. Matching for patterns that don't contain '*' means that module name must be equal to pattern respecting the case.
-     * If pattern contains '*' then to match pattern "<prefix>*<suffix>" module name must start with the <prefix> and end with <suffix>.
-     * <MatchedStar> denotes part of the module name between <prefix> and <suffix>.
-     * If module name can be matches with multiple patterns then pattern with the longest prefix will be picked.
-     * After selecting pattern we'll use list of substitutions to get candidate locations of the module and the try to load module
-     * from the candidate location.
-     * Substitution is a string that can contain zero or one '*'. To get candidate location from substitution we'll pick every
-     * substitution in the list and replace '*' with <MatchedStar> string. If candidate location is not rooted it
-     * will be converted to absolute using baseUrl.
-     * For example:
-     * baseUrl: /a/b/c
-     * "paths": {
-     *     // match all module names
-     *     "*": [
-     *         "*",        // use matched name as is,
-     *                     // <matched name> will be looked as /a/b/c/<matched name>
-     *
-     *         "folder1/*" // substitution will convert matched name to 'folder1/<matched name>',
-     *                     // since it is not rooted then final candidate location will be /a/b/c/folder1/<matched name>
-     *     ],
-     *     // match module names that start with 'components/'
-     *     "components/*": [ "/root/components/*" ] // substitution will convert /components/folder1/<matched name> to '/root/components/folder1/<matched name>',
-     *                                              // it is rooted so it will be final candidate location
-     * }
-     *
-     * 'rootDirs' allows the project to be spreaded across multiple locations and resolve modules with relative names as if
-     * they were in the same location. For example lets say there are two files
-     * '/local/src/content/file1.ts'
-     * '/shared/components/contracts/src/content/protocols/file2.ts'
-     * After bundling content of '/shared/components/contracts/src' will be merged with '/local/src' so
-     * if file1 has the following import 'import {x} from "./protocols/file2"' it will be resolved successfully in runtime.
-     * 'rootDirs' provides the way to tell compiler that in order to get the whole project it should behave as if content of all
-     * root dirs were merged together.
-     * I.e. for the example above 'rootDirs' will have two entries: [ '/local/src', '/shared/components/contracts/src' ].
-     * Compiler will first convert './protocols/file2' into absolute path relative to the location of containing file:
-     * '/local/src/content/protocols/file2' and try to load it - failure.
-     * Then it will search 'rootDirs' looking for a longest matching prefix of this absolute path and if such prefix is found - absolute path will
-     * be converted to a path relative to found rootDir entry './content/protocols/file2' (*). As a last step compiler will check all remaining
-     * entries in 'rootDirs', use them to build absolute path out of (*) and try to resolve module from this location.
-     */
-    function tryLoadModuleUsingOptionalResolutionSettings(extensions, moduleName, containingDirectory, loader, failedLookupLocations, state) {
-        if (!ts.isExternalModuleNameRelative(moduleName)) {
-            return tryLoadModuleUsingBaseUrl(extensions, moduleName, loader, failedLookupLocations, state);
-        }
-        else {
-            return tryLoadModuleUsingRootDirs(extensions, moduleName, containingDirectory, loader, failedLookupLocations, state);
-        }
-    }
-    function tryLoadModuleUsingRootDirs(extensions, moduleName, containingDirectory, loader, failedLookupLocations, state) {
-        if (!state.compilerOptions.rootDirs) {
-            return undefined;
-        }
-        if (state.traceEnabled) {
-            trace(state.host, ts.Diagnostics.rootDirs_option_is_set_using_it_to_resolve_relative_module_name_0, moduleName);
-        }
-        var candidate = ts.normalizePath(ts.combinePaths(containingDirectory, moduleName));
-        var matchedRootDir;
-        var matchedNormalizedPrefix;
-        for (var _i = 0, _a = state.compilerOptions.rootDirs; _i < _a.length; _i++) {
-            var rootDir = _a[_i];
-            // rootDirs are expected to be absolute
-            // in case of tsconfig.json this will happen automatically - compiler will expand relative names
-            // using location of tsconfig.json as base location
-            var normalizedRoot = ts.normalizePath(rootDir);
-            if (!ts.endsWith(normalizedRoot, ts.directorySeparator)) {
-                normalizedRoot += ts.directorySeparator;
-            }
-            var isLongestMatchingPrefix = ts.startsWith(candidate, normalizedRoot) &&
-                (matchedNormalizedPrefix === undefined || matchedNormalizedPrefix.length < normalizedRoot.length);
-            if (state.traceEnabled) {
-                trace(state.host, ts.Diagnostics.Checking_if_0_is_the_longest_matching_prefix_for_1_2, normalizedRoot, candidate, isLongestMatchingPrefix);
-            }
-            if (isLongestMatchingPrefix) {
-                matchedNormalizedPrefix = normalizedRoot;
-                matchedRootDir = rootDir;
-            }
-        }
-        if (matchedNormalizedPrefix) {
-            if (state.traceEnabled) {
-                trace(state.host, ts.Diagnostics.Longest_matching_prefix_for_0_is_1, candidate, matchedNormalizedPrefix);
-            }
-            var suffix = candidate.substr(matchedNormalizedPrefix.length);
-            // first - try to load from a initial location
-            if (state.traceEnabled) {
-                trace(state.host, ts.Diagnostics.Loading_0_from_the_root_dir_1_candidate_location_2, suffix, matchedNormalizedPrefix, candidate);
-            }
-            var resolvedFileName = loader(extensions, candidate, failedLookupLocations, !directoryProbablyExists(containingDirectory, state.host), state);
-            if (resolvedFileName) {
-                return resolvedFileName;
-            }
-            if (state.traceEnabled) {
-                trace(state.host, ts.Diagnostics.Trying_other_entries_in_rootDirs);
-            }
-            // then try to resolve using remaining entries in rootDirs
-            for (var _b = 0, _c = state.compilerOptions.rootDirs; _b < _c.length; _b++) {
-                var rootDir = _c[_b];
-                if (rootDir === matchedRootDir) {
-                    // skip the initially matched entry
-                    continue;
-                }
-                var candidate_1 = ts.combinePaths(ts.normalizePath(rootDir), suffix);
-                if (state.traceEnabled) {
-                    trace(state.host, ts.Diagnostics.Loading_0_from_the_root_dir_1_candidate_location_2, suffix, rootDir, candidate_1);
-                }
-                var baseDirectory = ts.getDirectoryPath(candidate_1);
-                var resolvedFileName_1 = loader(extensions, candidate_1, failedLookupLocations, !directoryProbablyExists(baseDirectory, state.host), state);
-                if (resolvedFileName_1) {
-                    return resolvedFileName_1;
-                }
-            }
-            if (state.traceEnabled) {
-                trace(state.host, ts.Diagnostics.Module_resolution_using_rootDirs_has_failed);
-            }
-        }
-        return undefined;
-    }
-    function tryLoadModuleUsingBaseUrl(extensions, moduleName, loader, failedLookupLocations, state) {
-        if (!state.compilerOptions.baseUrl) {
-            return undefined;
-        }
-        if (state.traceEnabled) {
-            trace(state.host, ts.Diagnostics.baseUrl_option_is_set_to_0_using_this_value_to_resolve_non_relative_module_name_1, state.compilerOptions.baseUrl, moduleName);
-        }
-        // string is for exact match
-        var matchedPattern;
-        if (state.compilerOptions.paths) {
-            if (state.traceEnabled) {
-                trace(state.host, ts.Diagnostics.paths_option_is_specified_looking_for_a_pattern_to_match_module_name_0, moduleName);
-            }
-            matchedPattern = ts.matchPatternOrExact(ts.getOwnKeys(state.compilerOptions.paths), moduleName);
-        }
-        if (matchedPattern) {
-            var matchedStar_1 = ts.isString(matchedPattern) ? undefined : ts.matchedText(matchedPattern, moduleName);
-            var matchedPatternText = ts.isString(matchedPattern) ? matchedPattern : ts.patternText(matchedPattern);
-            if (state.traceEnabled) {
-                trace(state.host, ts.Diagnostics.Module_name_0_matched_pattern_1, moduleName, matchedPatternText);
-            }
-            return ts.forEach(state.compilerOptions.paths[matchedPatternText], function (subst) {
-                var path = matchedStar_1 ? subst.replace("*", matchedStar_1) : subst;
-                var candidate = ts.normalizePath(ts.combinePaths(state.compilerOptions.baseUrl, path));
-                if (state.traceEnabled) {
-                    trace(state.host, ts.Diagnostics.Trying_substitution_0_candidate_module_location_Colon_1, subst, path);
-                }
-                // A path mapping may have an extension, in contrast to an import, which should omit it.
-                var extension = ts.tryGetExtensionFromPath(candidate);
-                if (extension !== undefined) {
-                    var path_1 = tryFile(candidate, failedLookupLocations, /*onlyRecordFailures*/ false, state);
-                    if (path_1 !== undefined) {
-                        return noPackageId({ path: path_1, ext: extension });
-                    }
-                }
-                return loader(extensions, candidate, failedLookupLocations, !directoryProbablyExists(ts.getDirectoryPath(candidate), state.host), state);
-            });
-        }
-        else {
-            var candidate = ts.normalizePath(ts.combinePaths(state.compilerOptions.baseUrl, moduleName));
-            if (state.traceEnabled) {
-                trace(state.host, ts.Diagnostics.Resolving_module_name_0_relative_to_base_url_1_2, moduleName, state.compilerOptions.baseUrl, candidate);
-            }
-            return loader(extensions, candidate, failedLookupLocations, !directoryProbablyExists(ts.getDirectoryPath(candidate), state.host), state);
-        }
-    }
-    function nodeModuleNameResolver(moduleName, containingFile, compilerOptions, host, cache) {
-        return nodeModuleNameResolverWorker(moduleName, ts.getDirectoryPath(containingFile), compilerOptions, host, cache, /*jsOnly*/ false);
-    }
-    ts.nodeModuleNameResolver = nodeModuleNameResolver;
-    /**
-     * Expose resolution logic to allow us to use Node module resolution logic from arbitrary locations.
-     * No way to do this with `require()`: https://github.com/nodejs/node/issues/5963
-     * Throws an error if the module can't be resolved.
-     */
-    /* @internal */
-    function resolveJavaScriptModule(moduleName, initialDir, host) {
-        var _a = nodeModuleNameResolverWorker(moduleName, initialDir, { moduleResolution: ts.ModuleResolutionKind.NodeJs, allowJs: true }, host, /*cache*/ undefined, /*jsOnly*/ true), resolvedModule = _a.resolvedModule, failedLookupLocations = _a.failedLookupLocations;
-        if (!resolvedModule) {
-            throw new Error("Could not resolve JS module '" + moduleName + "' starting at '" + initialDir + "'. Looked in: " + failedLookupLocations.join(", "));
-        }
-        return resolvedModule.resolvedFileName;
-    }
-    ts.resolveJavaScriptModule = resolveJavaScriptModule;
-    function nodeModuleNameResolverWorker(moduleName, containingDirectory, compilerOptions, host, cache, jsOnly) {
-        var traceEnabled = isTraceEnabled(compilerOptions, host);
-        var failedLookupLocations = [];
-        var state = { compilerOptions: compilerOptions, host: host, traceEnabled: traceEnabled };
-        var result = jsOnly ?
-            tryResolve(Extensions.JavaScript) :
-            (tryResolve(Extensions.TypeScript) ||
-                tryResolve(Extensions.JavaScript) ||
-                (compilerOptions.resolveJsonModule ? tryResolve(Extensions.Json) : undefined));
-        if (result && result.value) {
-            var _a = result.value, resolved = _a.resolved, originalPath = _a.originalPath, isExternalLibraryImport = _a.isExternalLibraryImport;
-            return createResolvedModuleWithFailedLookupLocations(resolved, originalPath, isExternalLibraryImport, failedLookupLocations);
-        }
-        return { resolvedModule: undefined, failedLookupLocations: failedLookupLocations };
-        function tryResolve(extensions) {
-            var loader = function (extensions, candidate, failedLookupLocations, onlyRecordFailures, state) { return nodeLoadModuleByRelativeName(extensions, candidate, failedLookupLocations, onlyRecordFailures, state, /*considerPackageJson*/ true); };
-            var resolved = tryLoadModuleUsingOptionalResolutionSettings(extensions, moduleName, containingDirectory, loader, failedLookupLocations, state);
-            if (resolved) {
-                return toSearchResult({ resolved: resolved, isExternalLibraryImport: false });
-            }
-            if (!ts.isExternalModuleNameRelative(moduleName)) {
-                if (traceEnabled) {
-                    trace(host, ts.Diagnostics.Loading_module_0_from_node_modules_folder_target_file_type_1, moduleName, Extensions[extensions]);
-                }
-                var resolved_1 = loadModuleFromNodeModules(extensions, moduleName, containingDirectory, failedLookupLocations, state, cache);
-                if (!resolved_1)
-                    return undefined;
-                var resolvedValue = resolved_1.value;
-                var originalPath = void 0;
-                if (!compilerOptions.preserveSymlinks && resolvedValue) {
-                    originalPath = resolvedValue.path;
-                    var path = realPath(resolvedValue.path, host, traceEnabled);
-                    if (path === originalPath) {
-                        originalPath = undefined;
-                    }
-                    resolvedValue = __assign({}, resolvedValue, { path: path });
-                }
-                // For node_modules lookups, get the real path so that multiple accesses to an `npm link`-ed module do not create duplicate files.
-                return { value: resolvedValue && { resolved: resolvedValue, originalPath: originalPath, isExternalLibraryImport: true } };
-            }
-            else {
-                var _a = ts.normalizePathAndParts(ts.combinePaths(containingDirectory, moduleName)), candidate = _a.path, parts = _a.parts;
-                var resolved_2 = nodeLoadModuleByRelativeName(extensions, candidate, failedLookupLocations, /*onlyRecordFailures*/ false, state, /*considerPackageJson*/ true);
-                // Treat explicit "node_modules" import as an external library import.
-                return resolved_2 && toSearchResult({ resolved: resolved_2, isExternalLibraryImport: ts.contains(parts, "node_modules") });
-            }
-        }
-    }
-    function realPath(path, host, traceEnabled) {
-        if (!host.realpath) {
-            return path;
-        }
-        var real = ts.normalizePath(host.realpath(path));
-        if (traceEnabled) {
-            trace(host, ts.Diagnostics.Resolving_real_path_for_0_result_1, path, real);
-        }
-        ts.Debug.assert(host.fileExists(real), path + " linked to nonexistent file " + real); // tslint:disable-line
-        return real;
-    }
-    function nodeLoadModuleByRelativeName(extensions, candidate, failedLookupLocations, onlyRecordFailures, state, considerPackageJson) {
-        if (state.traceEnabled) {
-            trace(state.host, ts.Diagnostics.Loading_module_as_file_Slash_folder_candidate_module_location_0_target_file_type_1, candidate, Extensions[extensions]);
-        }
-        if (!ts.hasTrailingDirectorySeparator(candidate)) {
-            if (!onlyRecordFailures) {
-                var parentOfCandidate = ts.getDirectoryPath(candidate);
-                if (!directoryProbablyExists(parentOfCandidate, state.host)) {
-                    if (state.traceEnabled) {
-                        trace(state.host, ts.Diagnostics.Directory_0_does_not_exist_skipping_all_lookups_in_it, parentOfCandidate);
-                    }
-                    onlyRecordFailures = true;
-                }
-            }
-            var resolvedFromFile = loadModuleFromFile(extensions, candidate, failedLookupLocations, onlyRecordFailures, state);
-            if (resolvedFromFile) {
-                var nm = considerPackageJson ? parseNodeModuleFromPath(resolvedFromFile) : undefined;
-                var packageId = nm && getPackageJsonInfo(nm.packageDirectory, nm.subModuleName, failedLookupLocations, /*onlyRecordFailures*/ false, state).packageId;
-                return withPackageId(packageId, resolvedFromFile);
-            }
-        }
-        if (!onlyRecordFailures) {
-            var candidateExists = directoryProbablyExists(candidate, state.host);
-            if (!candidateExists) {
-                if (state.traceEnabled) {
-                    trace(state.host, ts.Diagnostics.Directory_0_does_not_exist_skipping_all_lookups_in_it, candidate);
-                }
-                onlyRecordFailures = true;
-            }
-        }
-        return loadNodeModuleFromDirectory(extensions, candidate, failedLookupLocations, onlyRecordFailures, state, considerPackageJson);
-    }
-    var nodeModulesPathPart = "/node_modules/";
-    /**
-     * This will be called on the successfully resolved path from `loadModuleFromFile`.
-     * (Not neeeded for `loadModuleFromNodeModules` as that looks up the `package.json` as part of resolution.)
-     *
-     * packageDirectory is the directory of the package itself.
-     * subModuleName is the path within the package.
-     *   For `blah/node_modules/foo/index.d.ts` this is { packageDirectory: "foo", subModuleName: "index.d.ts" }. (Part before "/node_modules/" is ignored.)
-     *   For `/node_modules/foo/bar.d.ts` this is { packageDirectory: "foo", subModuleName": "bar/index.d.ts" }.
-     *   For `/node_modules/@types/foo/bar/index.d.ts` this is { packageDirectory: "@types/foo", subModuleName: "bar/index.d.ts" }.
-     *   For `/node_modules/foo/bar/index.d.ts` this is { packageDirectory: "foo", subModuleName": "bar/index.d.ts" }.
-     */
-    function parseNodeModuleFromPath(resolved) {
-        var path = ts.normalizePath(resolved.path);
-        var idx = path.lastIndexOf(nodeModulesPathPart);
-        if (idx === -1) {
-            return undefined;
-        }
-        var indexAfterNodeModules = idx + nodeModulesPathPart.length;
-        var indexAfterPackageName = moveToNextDirectorySeparatorIfAvailable(path, indexAfterNodeModules);
-        if (path.charCodeAt(indexAfterNodeModules) === 64 /* at */) {
-            indexAfterPackageName = moveToNextDirectorySeparatorIfAvailable(path, indexAfterPackageName);
-        }
-        var packageDirectory = path.slice(0, indexAfterPackageName);
-        var subModuleName = ts.removeExtension(path.slice(indexAfterPackageName + 1), resolved.ext) + ".d.ts" /* Dts */;
-        return { packageDirectory: packageDirectory, subModuleName: subModuleName };
-    }
-    function moveToNextDirectorySeparatorIfAvailable(path, prevSeparatorIndex) {
-        var nextSeparatorIndex = path.indexOf(ts.directorySeparator, prevSeparatorIndex + 1);
-        return nextSeparatorIndex === -1 ? prevSeparatorIndex : nextSeparatorIndex;
-    }
-    function addExtensionAndIndex(path) {
-        if (path === "") {
-            return "index.d.ts";
-        }
-        if (ts.endsWith(path, ".d.ts")) {
-            return path;
-        }
-        if (ts.endsWith(path, "/index")) {
-            return path + ".d.ts";
-        }
-        return path + "/index.d.ts";
-    }
-    /* @internal */
-    function directoryProbablyExists(directoryName, host) {
-        // if host does not support 'directoryExists' assume that directory will exist
-        return !host.directoryExists || host.directoryExists(directoryName);
-    }
-    ts.directoryProbablyExists = directoryProbablyExists;
-    function loadModuleFromFileNoPackageId(extensions, candidate, failedLookupLocations, onlyRecordFailures, state) {
-        return noPackageId(loadModuleFromFile(extensions, candidate, failedLookupLocations, onlyRecordFailures, state));
-    }
-    /**
-     * @param {boolean} onlyRecordFailures - if true then function won't try to actually load files but instead record all attempts as failures. This flag is necessary
-     * in cases when we know upfront that all load attempts will fail (because containing folder does not exists) however we still need to record all failed lookup locations.
-     */
-    function loadModuleFromFile(extensions, candidate, failedLookupLocations, onlyRecordFailures, state) {
-        if (extensions === Extensions.Json) {
-            var extensionLess = ts.tryRemoveExtension(candidate, ".json" /* Json */);
-            return extensionLess === undefined ? undefined : tryAddingExtensions(extensionLess, extensions, failedLookupLocations, onlyRecordFailures, state);
-        }
-        // First, try adding an extension. An import of "foo" could be matched by a file "foo.ts", or "foo.js" by "foo.js.ts"
-        var resolvedByAddingExtension = tryAddingExtensions(candidate, extensions, failedLookupLocations, onlyRecordFailures, state);
-        if (resolvedByAddingExtension) {
-            return resolvedByAddingExtension;
-        }
-        // If that didn't work, try stripping a ".js" or ".jsx" extension and replacing it with a TypeScript one;
-        // e.g. "./foo.js" can be matched by "./foo.ts" or "./foo.d.ts"
-        if (ts.hasJavaScriptFileExtension(candidate)) {
-            var extensionless = ts.removeFileExtension(candidate);
-            if (state.traceEnabled) {
-                var extension = candidate.substring(extensionless.length);
-                trace(state.host, ts.Diagnostics.File_name_0_has_a_1_extension_stripping_it, candidate, extension);
-            }
-            return tryAddingExtensions(extensionless, extensions, failedLookupLocations, onlyRecordFailures, state);
-        }
-    }
-    /** Try to return an existing file that adds one of the `extensions` to `candidate`. */
-    function tryAddingExtensions(candidate, extensions, failedLookupLocations, onlyRecordFailures, state) {
-        if (!onlyRecordFailures) {
-            // check if containing folder exists - if it doesn't then just record failures for all supported extensions without disk probing
-            var directory_1 = ts.getDirectoryPath(candidate);
-            if (directory_1) {
-                onlyRecordFailures = !directoryProbablyExists(directory_1, state.host);
-            }
-        }
-        switch (extensions) {
-            case Extensions.DtsOnly:
-                return tryExtension(".d.ts" /* Dts */);
-            case Extensions.TypeScript:
-                return tryExtension(".ts" /* Ts */) || tryExtension(".tsx" /* Tsx */) || tryExtension(".d.ts" /* Dts */);
-            case Extensions.JavaScript:
-                return tryExtension(".js" /* Js */) || tryExtension(".jsx" /* Jsx */);
-            case Extensions.Json:
-                return tryExtension(".json" /* Json */);
-        }
-        function tryExtension(ext) {
-            var path = tryFile(candidate + ext, failedLookupLocations, onlyRecordFailures, state);
-            return path === undefined ? undefined : { path: path, ext: ext };
-        }
-    }
-    /** Return the file if it exists. */
-    function tryFile(fileName, failedLookupLocations, onlyRecordFailures, state) {
-        if (!onlyRecordFailures) {
-            if (state.host.fileExists(fileName)) {
-                if (state.traceEnabled) {
-                    trace(state.host, ts.Diagnostics.File_0_exist_use_it_as_a_name_resolution_result, fileName);
-                }
-                return fileName;
-            }
-            else {
-                if (state.traceEnabled) {
-                    trace(state.host, ts.Diagnostics.File_0_does_not_exist, fileName);
-                }
-            }
-        }
-        failedLookupLocations.push(fileName);
-        return undefined;
-    }
-    function loadNodeModuleFromDirectory(extensions, candidate, failedLookupLocations, onlyRecordFailures, state, considerPackageJson) {
-        if (considerPackageJson === void 0) { considerPackageJson = true; }
-        var _a = considerPackageJson
-            ? getPackageJsonInfo(candidate, "", failedLookupLocations, onlyRecordFailures, state)
-            : { packageJsonContent: undefined, packageId: undefined }, packageJsonContent = _a.packageJsonContent, packageId = _a.packageId;
-        return withPackageId(packageId, loadNodeModuleFromDirectoryWorker(extensions, candidate, failedLookupLocations, onlyRecordFailures, state, packageJsonContent));
-    }
-    function loadNodeModuleFromDirectoryWorker(extensions, candidate, failedLookupLocations, onlyRecordFailures, state, packageJsonContent) {
-        var fromPackageJson = packageJsonContent && loadModuleFromPackageJson(packageJsonContent, extensions, candidate, failedLookupLocations, state);
-        if (fromPackageJson) {
-            return fromPackageJson;
-        }
-        var directoryExists = !onlyRecordFailures && directoryProbablyExists(candidate, state.host);
-        return loadModuleFromFile(extensions, ts.combinePaths(candidate, "index"), failedLookupLocations, !directoryExists, state);
-    }
-    function getPackageJsonInfo(nodeModuleDirectory, subModuleName, failedLookupLocations, onlyRecordFailures, state) {
-        var host = state.host, traceEnabled = state.traceEnabled;
-        var directoryExists = !onlyRecordFailures && directoryProbablyExists(nodeModuleDirectory, host);
-        var packageJsonPath = pathToPackageJson(nodeModuleDirectory);
-        if (directoryExists && host.fileExists(packageJsonPath)) {
-            var packageJsonContent = readJson(packageJsonPath, host);
-            if (subModuleName === "") { // looking up the root - need to handle types/typings/main redirects for subModuleName
-                var path = tryReadPackageJsonFields(/*readTypes*/ true, packageJsonContent, nodeModuleDirectory, state);
-                if (typeof path === "string") {
-                    subModuleName = addExtensionAndIndex(path.substring(nodeModuleDirectory.length + 1));
-                }
-                else {
-                    var jsPath = tryReadPackageJsonFields(/*readTypes*/ false, packageJsonContent, nodeModuleDirectory, state);
-                    if (typeof jsPath === "string" && jsPath.length > nodeModuleDirectory.length) {
-                        var potentialSubModule_1 = jsPath.substring(nodeModuleDirectory.length + 1);
-                        subModuleName = (ts.forEach(ts.supportedJavascriptExtensions, function (extension) {
-                            return ts.tryRemoveExtension(potentialSubModule_1, extension);
-                        }) || potentialSubModule_1) + ".d.ts" /* Dts */;
-                    }
-                    else {
-                        subModuleName = "index.d.ts";
-                    }
-                }
-            }
-            if (!ts.endsWith(subModuleName, ".d.ts" /* Dts */)) {
-                subModuleName = addExtensionAndIndex(subModuleName);
-            }
-            var packageId = typeof packageJsonContent.name === "string" && typeof packageJsonContent.version === "string"
-                ? { name: packageJsonContent.name, subModuleName: subModuleName, version: packageJsonContent.version }
-                : undefined;
-            if (traceEnabled) {
-                if (packageId) {
-                    trace(host, ts.Diagnostics.Found_package_json_at_0_Package_ID_is_1, packageJsonPath, ts.packageIdToString(packageId));
-                }
-                else {
-                    trace(host, ts.Diagnostics.Found_package_json_at_0, packageJsonPath);
-                }
-            }
-            return { found: true, packageJsonContent: packageJsonContent, packageId: packageId };
-        }
-        else {
-            if (directoryExists && traceEnabled) {
-                trace(host, ts.Diagnostics.File_0_does_not_exist, packageJsonPath);
-            }
-            // record package json as one of failed lookup locations - in the future if this file will appear it will invalidate resolution results
-            failedLookupLocations.push(packageJsonPath);
-            return { found: false, packageJsonContent: undefined, packageId: undefined };
-        }
-    }
-    function loadModuleFromPackageJson(jsonContent, extensions, candidate, failedLookupLocations, state) {
-        var file = tryReadPackageJsonFields(extensions !== Extensions.JavaScript && extensions !== Extensions.Json, jsonContent, candidate, state);
-        if (!file) {
-            if (extensions === Extensions.TypeScript) {
-                // When resolving typescript modules, try resolving using main field as well
-                file = tryReadPackageJsonFields(/*readTypes*/ false, jsonContent, candidate, state);
-                if (!file) {
-                    return undefined;
-                }
-            }
-            else {
-                return undefined;
-            }
-        }
-        var onlyRecordFailures = !directoryProbablyExists(ts.getDirectoryPath(file), state.host);
-        var fromFile = tryFile(file, failedLookupLocations, onlyRecordFailures, state);
-        if (fromFile) {
-            var resolved = resolvedIfExtensionMatches(extensions, fromFile);
-            if (resolved) {
-                return resolved;
-            }
-            if (state.traceEnabled) {
-                trace(state.host, ts.Diagnostics.File_0_has_an_unsupported_extension_so_skipping_it, fromFile);
-            }
-        }
-        // Even if extensions is DtsOnly, we can still look up a .ts file as a result of package.json "types"
-        var nextExtensions = extensions === Extensions.DtsOnly ? Extensions.TypeScript : extensions;
-        // Don't do package.json lookup recursively, because Node.js' package lookup doesn't.
-        var result = nodeLoadModuleByRelativeName(nextExtensions, file, failedLookupLocations, onlyRecordFailures, state, /*considerPackageJson*/ false);
-        if (result) {
-            // It won't have a `packageId` set, because we disabled `considerPackageJson`.
-            ts.Debug.assert(result.packageId === undefined);
-            return { path: result.path, ext: result.extension };
-        }
-    }
-    /** Resolve from an arbitrarily specified file. Return `undefined` if it has an unsupported extension. */
-    function resolvedIfExtensionMatches(extensions, path) {
-        var ext = ts.tryGetExtensionFromPath(path);
-        return ext !== undefined && extensionIsOk(extensions, ext) ? { path: path, ext: ext } : undefined;
-    }
-    /** True if `extension` is one of the supported `extensions`. */
-    function extensionIsOk(extensions, extension) {
-        switch (extensions) {
-            case Extensions.JavaScript:
-                return extension === ".js" /* Js */ || extension === ".jsx" /* Jsx */;
-            case Extensions.Json:
-                return extension === ".json" /* Json */;
-            case Extensions.TypeScript:
-                return extension === ".ts" /* Ts */ || extension === ".tsx" /* Tsx */ || extension === ".d.ts" /* Dts */;
-            case Extensions.DtsOnly:
-                return extension === ".d.ts" /* Dts */;
-        }
-    }
-    function pathToPackageJson(directory) {
-        return ts.combinePaths(directory, "package.json");
-    }
-    function loadModuleFromNodeModulesFolder(extensions, moduleName, nodeModulesFolder, nodeModulesFolderExists, failedLookupLocations, state) {
-        var candidate = ts.normalizePath(ts.combinePaths(nodeModulesFolder, moduleName));
-        // First look for a nested package.json, as in `node_modules/foo/bar/package.json`.
-        var packageJsonContent;
-        var packageId;
-        var packageInfo = getPackageJsonInfo(candidate, "", failedLookupLocations, /*onlyRecordFailures*/ !nodeModulesFolderExists, state);
-        if (packageInfo.found) {
-            (packageJsonContent = packageInfo.packageJsonContent, packageId = packageInfo.packageId);
-        }
-        else {
-            var _a = getPackageName(moduleName), packageName = _a.packageName, rest = _a.rest;
-            if (rest !== "") { // If "rest" is empty, we just did this search above.
-                var packageRootPath = ts.combinePaths(nodeModulesFolder, packageName);
-                // Don't use a "types" or "main" from here because we're not loading the root, but a subdirectory -- just here for the packageId.
-                packageId = getPackageJsonInfo(packageRootPath, rest, failedLookupLocations, !nodeModulesFolderExists, state).packageId;
-            }
-        }
-        var pathAndExtension = loadModuleFromFile(extensions, candidate, failedLookupLocations, !nodeModulesFolderExists, state) ||
-            loadNodeModuleFromDirectoryWorker(extensions, candidate, failedLookupLocations, !nodeModulesFolderExists, state, packageJsonContent);
-        return withPackageId(packageId, pathAndExtension);
-    }
-    /* @internal */
-    function getPackageName(moduleName) {
-        var idx = moduleName.indexOf(ts.directorySeparator);
-        if (moduleName[0] === "@") {
-            idx = moduleName.indexOf(ts.directorySeparator, idx + 1);
-        }
-        return idx === -1 ? { packageName: moduleName, rest: "" } : { packageName: moduleName.slice(0, idx), rest: moduleName.slice(idx + 1) };
-    }
-    ts.getPackageName = getPackageName;
-    function loadModuleFromNodeModules(extensions, moduleName, directory, failedLookupLocations, state, cache) {
-        return loadModuleFromNodeModulesWorker(extensions, moduleName, directory, failedLookupLocations, state, /*typesOnly*/ false, cache);
-    }
-    function loadModuleFromNodeModulesAtTypes(moduleName, directory, failedLookupLocations, state) {
-        // Extensions parameter here doesn't actually matter, because typesOnly ensures we're just doing @types lookup, which is always DtsOnly.
-        return loadModuleFromNodeModulesWorker(Extensions.DtsOnly, moduleName, directory, failedLookupLocations, state, /*typesOnly*/ true, /*cache*/ undefined);
-    }
-    function loadModuleFromNodeModulesWorker(extensions, moduleName, directory, failedLookupLocations, state, typesOnly, cache) {
-        var perModuleNameCache = cache && cache.getOrCreateCacheForModuleName(moduleName);
-        return ts.forEachAncestorDirectory(ts.normalizeSlashes(directory), function (ancestorDirectory) {
-            if (ts.getBaseFileName(ancestorDirectory) !== "node_modules") {
-                var resolutionFromCache = tryFindNonRelativeModuleNameInCache(perModuleNameCache, moduleName, ancestorDirectory, state.traceEnabled, state.host, failedLookupLocations);
-                if (resolutionFromCache) {
-                    return resolutionFromCache;
-                }
-                return toSearchResult(loadModuleFromNodeModulesOneLevel(extensions, moduleName, ancestorDirectory, failedLookupLocations, state, typesOnly));
-            }
-        });
-    }
-    /** Load a module from a single node_modules directory, but not from any ancestors' node_modules directories. */
-    function loadModuleFromNodeModulesOneLevel(extensions, moduleName, directory, failedLookupLocations, state, typesOnly) {
-        if (typesOnly === void 0) { typesOnly = false; }
-        var nodeModulesFolder = ts.combinePaths(directory, "node_modules");
-        var nodeModulesFolderExists = directoryProbablyExists(nodeModulesFolder, state.host);
-        if (!nodeModulesFolderExists && state.traceEnabled) {
-            trace(state.host, ts.Diagnostics.Directory_0_does_not_exist_skipping_all_lookups_in_it, nodeModulesFolder);
-        }
-        var packageResult = typesOnly ? undefined : loadModuleFromNodeModulesFolder(extensions, moduleName, nodeModulesFolder, nodeModulesFolderExists, failedLookupLocations, state);
-        if (packageResult) {
-            return packageResult;
-        }
-        if (extensions !== Extensions.JavaScript && extensions !== Extensions.Json) {
-            var nodeModulesAtTypes_1 = ts.combinePaths(nodeModulesFolder, "@types");
-            var nodeModulesAtTypesExists = nodeModulesFolderExists;
-            if (nodeModulesFolderExists && !directoryProbablyExists(nodeModulesAtTypes_1, state.host)) {
-                if (state.traceEnabled) {
-                    trace(state.host, ts.Diagnostics.Directory_0_does_not_exist_skipping_all_lookups_in_it, nodeModulesAtTypes_1);
-                }
-                nodeModulesAtTypesExists = false;
-            }
-            return loadModuleFromNodeModulesFolder(Extensions.DtsOnly, mangleScopedPackage(moduleName, state), nodeModulesAtTypes_1, nodeModulesAtTypesExists, failedLookupLocations, state);
-        }
-    }
-    /** Double underscores are used in DefinitelyTyped to delimit scoped packages. */
-    var mangledScopedPackageSeparator = "__";
-    /** For a scoped package, we must look in `@types/foo__bar` instead of `@types/@foo/bar`. */
-    function mangleScopedPackage(packageName, state) {
-        var mangled = getMangledNameForScopedPackage(packageName);
-        if (state.traceEnabled && mangled !== packageName) {
-            trace(state.host, ts.Diagnostics.Scoped_package_detected_looking_in_0, mangled);
-        }
-        return mangled;
-    }
-    /* @internal */
-    function getTypesPackageName(packageName) {
-        return "@types/" + getMangledNameForScopedPackage(packageName);
-    }
-    ts.getTypesPackageName = getTypesPackageName;
-    /* @internal */
-    function getMangledNameForScopedPackage(packageName) {
-        if (ts.startsWith(packageName, "@")) {
-            var replaceSlash = packageName.replace(ts.directorySeparator, mangledScopedPackageSeparator);
-            if (replaceSlash !== packageName) {
-                return replaceSlash.slice(1); // Take off the "@"
-            }
-        }
-        return packageName;
-    }
-    ts.getMangledNameForScopedPackage = getMangledNameForScopedPackage;
-    /* @internal */
-    function getPackageNameFromAtTypesDirectory(mangledName) {
-        var withoutAtTypePrefix = ts.removePrefix(mangledName, "@types/");
-        if (withoutAtTypePrefix !== mangledName) {
-            return getUnmangledNameForScopedPackage(withoutAtTypePrefix);
-        }
-        return mangledName;
-    }
-    ts.getPackageNameFromAtTypesDirectory = getPackageNameFromAtTypesDirectory;
-    /* @internal */
-    function getUnmangledNameForScopedPackage(typesPackageName) {
-        return ts.stringContains(typesPackageName, mangledScopedPackageSeparator) ?
-            "@" + typesPackageName.replace(mangledScopedPackageSeparator, ts.directorySeparator) :
-            typesPackageName;
-    }
-    ts.getUnmangledNameForScopedPackage = getUnmangledNameForScopedPackage;
-    function tryFindNonRelativeModuleNameInCache(cache, moduleName, containingDirectory, traceEnabled, host, failedLookupLocations) {
-        var result = cache && cache.get(containingDirectory);
-        if (result) {
-            if (traceEnabled) {
-                trace(host, ts.Diagnostics.Resolution_for_module_0_was_found_in_cache_from_location_1, moduleName, containingDirectory);
-            }
-            failedLookupLocations.push.apply(failedLookupLocations, result.failedLookupLocations);
-            return { value: result.resolvedModule && { path: result.resolvedModule.resolvedFileName, extension: result.resolvedModule.extension, packageId: result.resolvedModule.packageId } };
-        }
-    }
-    function classicNameResolver(moduleName, containingFile, compilerOptions, host, cache) {
-        var traceEnabled = isTraceEnabled(compilerOptions, host);
-        var state = { compilerOptions: compilerOptions, host: host, traceEnabled: traceEnabled };
-        var failedLookupLocations = [];
-        var containingDirectory = ts.getDirectoryPath(containingFile);
-        var resolved = tryResolve(Extensions.TypeScript) || tryResolve(Extensions.JavaScript);
-        // No originalPath because classic resolution doesn't resolve realPath
-        return createResolvedModuleWithFailedLookupLocations(resolved && resolved.value, /*originalPath*/ undefined, /*isExternalLibraryImport*/ false, failedLookupLocations);
-        function tryResolve(extensions) {
-            var resolvedUsingSettings = tryLoadModuleUsingOptionalResolutionSettings(extensions, moduleName, containingDirectory, loadModuleFromFileNoPackageId, failedLookupLocations, state);
-            if (resolvedUsingSettings) {
-                return { value: resolvedUsingSettings };
-            }
-            var perModuleNameCache = cache && cache.getOrCreateCacheForModuleName(moduleName);
-            if (!ts.isExternalModuleNameRelative(moduleName)) {
-                // Climb up parent directories looking for a module.
-                var resolved_3 = ts.forEachAncestorDirectory(containingDirectory, function (directory) {
-                    var resolutionFromCache = tryFindNonRelativeModuleNameInCache(perModuleNameCache, moduleName, directory, traceEnabled, host, failedLookupLocations);
-                    if (resolutionFromCache) {
-                        return resolutionFromCache;
-                    }
-                    var searchName = ts.normalizePath(ts.combinePaths(directory, moduleName));
-                    return toSearchResult(loadModuleFromFileNoPackageId(extensions, searchName, failedLookupLocations, /*onlyRecordFailures*/ false, state));
-                });
-                if (resolved_3) {
-                    return resolved_3;
-                }
-                if (extensions === Extensions.TypeScript) {
-                    // If we didn't find the file normally, look it up in @types.
-                    return loadModuleFromNodeModulesAtTypes(moduleName, containingDirectory, failedLookupLocations, state);
-                }
-            }
-            else {
-                var candidate = ts.normalizePath(ts.combinePaths(containingDirectory, moduleName));
-                return toSearchResult(loadModuleFromFileNoPackageId(extensions, candidate, failedLookupLocations, /*onlyRecordFailures*/ false, state));
-            }
-        }
-    }
-    ts.classicNameResolver = classicNameResolver;
-    /**
-     * LSHost may load a module from a global cache of typings.
-     * This is the minumum code needed to expose that functionality; the rest is in LSHost.
-     */
-    /* @internal */
-    function loadModuleFromGlobalCache(moduleName, projectName, compilerOptions, host, globalCache) {
-        var traceEnabled = isTraceEnabled(compilerOptions, host);
-        if (traceEnabled) {
-            trace(host, ts.Diagnostics.Auto_discovery_for_typings_is_enabled_in_project_0_Running_extra_resolution_pass_for_module_1_using_cache_location_2, projectName, moduleName, globalCache);
-        }
-        var state = { compilerOptions: compilerOptions, host: host, traceEnabled: traceEnabled };
-        var failedLookupLocations = [];
-        var resolved = loadModuleFromNodeModulesOneLevel(Extensions.DtsOnly, moduleName, globalCache, failedLookupLocations, state);
-        return createResolvedModuleWithFailedLookupLocations(resolved, /*originalPath*/ undefined, /*isExternalLibraryImport*/ true, failedLookupLocations);
-    }
-    ts.loadModuleFromGlobalCache = loadModuleFromGlobalCache;
-    /**
-     * Wraps value to SearchResult.
-     * @returns undefined if value is undefined or { value } otherwise
-     */
-    function toSearchResult(value) {
-        return value !== undefined ? { value: value } : undefined;
-    }
-})(ts || (ts = {}));
 /* @internal */
 var ts;
 (function (ts) {
@@ -26789,6 +29198,8 @@ var ts;
             createPromiseType: createPromiseType,
             createArrayType: createArrayType,
             getBooleanType: function () { return booleanType; },
+            getFalseType: function () { return falseType; },
+            getTrueType: function () { return trueType; },
             getVoidType: function () { return voidType; },
             getUndefinedType: function () { return undefinedType; },
             getNullType: function () { return nullType; },
@@ -26874,9 +29285,9 @@ var ts;
         var nullWideningType = strictNullChecks ? nullType : createIntrinsicType(16384 /* Null */ | 134217728 /* ContainsWideningType */, "null");
         var stringType = createIntrinsicType(4 /* String */, "string");
         var numberType = createIntrinsicType(8 /* Number */, "number");
-        var trueType = createIntrinsicType(256 /* BooleanLiteral */, "true");
         var falseType = createIntrinsicType(256 /* BooleanLiteral */, "false");
-        var booleanType = createBooleanType([trueType, falseType]);
+        var trueType = createIntrinsicType(256 /* BooleanLiteral */, "true");
+        var booleanType = createBooleanType([falseType, trueType]);
         var esSymbolType = createIntrinsicType(1024 /* ESSymbol */, "symbol");
         var voidType = createIntrinsicType(4096 /* Void */, "void");
         var neverType = createIntrinsicType(32768 /* Never */, "never");
@@ -27263,17 +29674,17 @@ var ts;
         }
         function getJsxNamespace(location) {
             if (location) {
-                var file_1 = ts.getSourceFileOfNode(location);
-                if (file_1) {
-                    if (file_1.localJsxNamespace) {
-                        return file_1.localJsxNamespace;
+                var file = ts.getSourceFileOfNode(location);
+                if (file) {
+                    if (file.localJsxNamespace) {
+                        return file.localJsxNamespace;
                     }
-                    var jsxPragma = file_1.pragmas.get("jsx");
+                    var jsxPragma = file.pragmas.get("jsx");
                     if (jsxPragma) {
                         var chosenpragma = ts.isArray(jsxPragma) ? jsxPragma[0] : jsxPragma; // TODO: GH#18217
-                        file_1.localJsxFactory = ts.parseIsolatedEntityName(chosenpragma.arguments.factory, languageVersion);
-                        if (file_1.localJsxFactory) {
-                            return file_1.localJsxNamespace = getFirstIdentifier(file_1.localJsxFactory).escapedText;
+                        file.localJsxFactory = ts.parseIsolatedEntityName(chosenpragma.arguments.factory, languageVersion);
+                        if (file.localJsxFactory) {
+                            return file.localJsxNamespace = getFirstIdentifier(file.localJsxFactory).escapedText;
                         }
                     }
                 }
@@ -27401,7 +29812,7 @@ var ts;
                 target.flags |= source.flags;
                 if (source.valueDeclaration &&
                     (!target.valueDeclaration ||
-                        (target.valueDeclaration.kind === 239 /* ModuleDeclaration */ && source.valueDeclaration.kind !== 239 /* ModuleDeclaration */))) {
+                        ts.isEffectiveModuleDeclaration(target.valueDeclaration) && !ts.isEffectiveModuleDeclaration(source.valueDeclaration))) {
                     // other kinds of value declarations take precedence over modules
                     target.valueDeclaration = source.valueDeclaration;
                 }
@@ -28226,8 +30637,8 @@ var ts;
                 else {
                     exportDefaultSymbol = resolveExportByName(moduleSymbol, "default" /* Default */, dontResolveAlias);
                 }
-                var file_2 = ts.find(moduleSymbol.declarations, ts.isSourceFile);
-                var hasSyntheticDefault = canHaveSyntheticDefault(file_2, moduleSymbol, dontResolveAlias);
+                var file = ts.find(moduleSymbol.declarations, ts.isSourceFile);
+                var hasSyntheticDefault = canHaveSyntheticDefault(file, moduleSymbol, dontResolveAlias);
                 if (!exportDefaultSymbol && !hasSyntheticDefault) {
                     error(node.name, ts.Diagnostics.Module_0_has_no_default_export, symbolToString(moduleSymbol));
                 }
@@ -28493,32 +30904,32 @@ var ts;
             else if (name.kind === 146 /* QualifiedName */ || name.kind === 185 /* PropertyAccessExpression */) {
                 var left = name.kind === 146 /* QualifiedName */ ? name.left : name.expression;
                 var right = name.kind === 146 /* QualifiedName */ ? name.right : name.name;
-                var namespace_1 = resolveEntityName(left, namespaceMeaning, ignoreErrors, /*dontResolveAlias*/ false, location);
-                if (!namespace_1 || ts.nodeIsMissing(right)) {
+                var namespace = resolveEntityName(left, namespaceMeaning, ignoreErrors, /*dontResolveAlias*/ false, location);
+                if (!namespace || ts.nodeIsMissing(right)) {
                     return undefined;
                 }
-                else if (namespace_1 === unknownSymbol) {
-                    return namespace_1;
+                else if (namespace === unknownSymbol) {
+                    return namespace;
                 }
                 if (ts.isInJavaScriptFile(name)) {
-                    if (namespace_1.valueDeclaration &&
-                        ts.isVariableDeclaration(namespace_1.valueDeclaration) &&
-                        namespace_1.valueDeclaration.initializer &&
-                        isCommonJsRequire(namespace_1.valueDeclaration.initializer)) {
-                        var moduleName = namespace_1.valueDeclaration.initializer.arguments[0];
+                    if (namespace.valueDeclaration &&
+                        ts.isVariableDeclaration(namespace.valueDeclaration) &&
+                        namespace.valueDeclaration.initializer &&
+                        isCommonJsRequire(namespace.valueDeclaration.initializer)) {
+                        var moduleName = namespace.valueDeclaration.initializer.arguments[0];
                         var moduleSym = resolveExternalModuleName(moduleName, moduleName);
                         if (moduleSym) {
                             var resolvedModuleSymbol = resolveExternalModuleSymbol(moduleSym);
                             if (resolvedModuleSymbol) {
-                                namespace_1 = resolvedModuleSymbol;
+                                namespace = resolvedModuleSymbol;
                             }
                         }
                     }
                 }
-                symbol = getSymbol(getExportsOfSymbol(namespace_1), right.escapedText, meaning);
+                symbol = getSymbol(getExportsOfSymbol(namespace), right.escapedText, meaning);
                 if (!symbol) {
                     if (!ignoreErrors) {
-                        error(right, ts.Diagnostics.Namespace_0_has_no_exported_member_1, getFullyQualifiedName(namespace_1), ts.declarationNameToString(right));
+                        error(right, ts.Diagnostics.Namespace_0_has_no_exported_member_1, getFullyQualifiedName(namespace), ts.declarationNameToString(right));
                     }
                     return undefined;
                 }
@@ -28889,8 +31300,8 @@ var ts;
         }
         function findConstructorDeclaration(node) {
             var members = node.members;
-            for (var _i = 0, members_2 = members; _i < members_2.length; _i++) {
-                var member = members_2[_i];
+            for (var _i = 0, members_1 = members; _i < members_1.length; _i++) {
+                var member = members_1[_i];
                 if (member.kind === 155 /* Constructor */ && ts.nodeIsPresent(member.body)) {
                     return member;
                 }
@@ -29190,7 +31601,7 @@ var ts;
         }
         function hasVisibleDeclarations(symbol, shouldComputeAliasToMakeVisible) {
             var aliasesToMakeVisible;
-            if (ts.forEach(symbol.declarations, function (declaration) { return !getIsDeclarationVisible(declaration); })) {
+            if (!ts.every(symbol.declarations, getIsDeclarationVisible)) {
                 return undefined;
             }
             return { accessibility: 0 /* Accessible */, aliasesToMakeVisible: aliasesToMakeVisible };
@@ -29792,9 +32203,13 @@ var ts;
                         context.enclosingDeclaration = undefined;
                         if (ts.getCheckFlags(propertySymbol) & 1024 /* Late */) {
                             var decl = ts.first(propertySymbol.declarations);
-                            var name = hasLateBindableName(decl) && resolveEntityName(decl.name.expression, 67216319 /* Value */);
-                            if (name && context.tracker.trackSymbol) {
-                                context.tracker.trackSymbol(name, saveEnclosingDeclaration, 67216319 /* Value */);
+                            if (context.tracker.trackSymbol && hasLateBindableName(decl)) {
+                                // get symbol of the first identifier of the entityName
+                                var firstIdentifier = getFirstIdentifier(decl.name.expression);
+                                var name = resolveName(firstIdentifier, firstIdentifier.escapedText, 67216319 /* Value */ | 1048576 /* ExportValue */, /*nodeNotFoundErrorMessage*/ undefined, /*nameArg*/ undefined, /*isUse*/ true);
+                                if (name) {
+                                    context.tracker.trackSymbol(name, saveEnclosingDeclaration, 67216319 /* Value */);
+                                }
                             }
                         }
                         var propertyName = symbolToName(propertySymbol, context, 67216319 /* Value */, /*expectsIdentifier*/ true);
@@ -30253,8 +32668,8 @@ var ts;
             }
             if (symbol.declarations && symbol.declarations.length) {
                 if (ts.some(symbol.declarations, hasExternalModuleSymbol) && context.enclosingDeclaration) { // TODO: GH#18217
-                    var file_3 = ts.getDeclarationOfKind(symbol, 274 /* SourceFile */);
-                    if (!file_3 || !context.tracker.moduleResolverHost) {
+                    var file = ts.getDeclarationOfKind(symbol, 274 /* SourceFile */);
+                    if (!file || !context.tracker.moduleResolverHost) {
                         if (context.tracker.trackReferencedAmbientModule) {
                             var ambientDecls = ts.filter(symbol.declarations, ts.isAmbientModule);
                             if (ts.length(ambientDecls)) {
@@ -30267,7 +32682,8 @@ var ts;
                         // ambient module, just use declaration/symbol name (fallthrough)
                     }
                     else {
-                        return "\"" + ts.getResolvedExternalModuleName(context.tracker.moduleResolverHost, file_3, ts.getSourceFileOfNode(ts.getOriginalNode(context.enclosingDeclaration))) + "\"";
+                        var contextFile = ts.getSourceFileOfNode(ts.getOriginalNode(context.enclosingDeclaration));
+                        return "\"" + (file.moduleName || ts.moduleSpecifiers.getModuleSpecifier(compilerOptions, contextFile, contextFile.path, file.path, context.tracker.moduleResolverHost)) + "\"";
                     }
                 }
                 var declaration = symbol.declarations[0];
@@ -30791,7 +33207,7 @@ var ts;
             var definedInConstructor = false;
             var definedInMethod = false;
             var jsDocType;
-            var _loop_3 = function (declaration) {
+            var _loop_1 = function (declaration) {
                 var declarationInConstructor = false;
                 var expression = declaration.kind === 200 /* BinaryExpression */ ? declaration :
                     declaration.kind === 185 /* PropertyAccessExpression */ ? ts.cast(declaration.parent, ts.isBinaryExpression) :
@@ -30834,20 +33250,20 @@ var ts;
                         special === 2 /* ModuleExports */ &&
                         symbol.escapedName === "export=" /* ExportEquals */) {
                         var exportedType_1 = resolveStructuredTypeMembers(type_2);
-                        var members_3 = ts.createSymbolTable();
-                        ts.copyEntries(exportedType_1.members, members_3);
+                        var members_2 = ts.createSymbolTable();
+                        ts.copyEntries(exportedType_1.members, members_2);
                         symbol.exports.forEach(function (s, name) {
-                            if (members_3.has(name)) {
+                            if (members_2.has(name)) {
                                 var exportedMember = exportedType_1.members.get(name);
                                 var union = createSymbol(s.flags | exportedMember.flags, name);
                                 union.type = getUnionType([getTypeOfSymbol(s), getTypeOfSymbol(exportedMember)]);
-                                members_3.set(name, union);
+                                members_2.set(name, union);
                             }
                             else {
-                                members_3.set(name, s);
+                                members_2.set(name, s);
                             }
                         });
-                        type_2 = createAnonymousType(exportedType_1.symbol, members_3, exportedType_1.callSignatures, exportedType_1.constructSignatures, exportedType_1.stringIndexInfo, exportedType_1.numberIndexInfo);
+                        type_2 = createAnonymousType(exportedType_1.symbol, members_2, exportedType_1.callSignatures, exportedType_1.constructSignatures, exportedType_1.stringIndexInfo, exportedType_1.numberIndexInfo);
                     }
                     var anyedType = type_2;
                     if (isEmptyArrayLiteralType(type_2)) {
@@ -30864,7 +33280,7 @@ var ts;
             };
             for (var _i = 0, _a = symbol.declarations; _i < _a.length; _i++) {
                 var declaration = _a[_i];
-                var state_2 = _loop_3(declaration);
+                var state_2 = _loop_1(declaration);
                 if (typeof state_2 === "object")
                     return state_2.value;
             }
@@ -31333,8 +33749,8 @@ var ts;
         // The function allocates a new array if the input type parameter set is undefined, but otherwise it modifies the set
         // in-place and returns the same array.
         function appendTypeParameters(typeParameters, declarations) {
-            for (var _i = 0, declarations_2 = declarations; _i < declarations_2.length; _i++) {
-                var declaration = declarations_2[_i];
+            for (var _i = 0, declarations_1 = declarations; _i < declarations_1.length; _i++) {
+                var declaration = declarations_1[_i];
                 typeParameters = ts.appendIfUnique(typeParameters, getDeclaredTypeOfTypeParameter(getSymbolOfNode(declaration)));
             }
             return typeParameters;
@@ -31574,7 +33990,7 @@ var ts;
         // object types.
         function isValidBaseType(type) {
             return !!(type.flags & (131072 /* Object */ | 16777216 /* NonPrimitive */ | 1 /* Any */)) && !isGenericMappedType(type) ||
-                !!(type.flags & 524288 /* Intersection */) && !ts.some(type.types, function (t) { return !isValidBaseType(t); });
+                !!(type.flags & 524288 /* Intersection */) && ts.every(type.types, isValidBaseType);
         }
         function resolveBaseTypesOfInterface(type) {
             type.resolvedBaseTypes = type.resolvedBaseTypes || ts.emptyArray;
@@ -31912,8 +34328,8 @@ var ts;
         // we check symbols to see if we can quickly conclude they are free of "this" references, thus needing no instantiation.
         function createInstantiatedSymbolTable(symbols, mapper, mappingThisOnly) {
             var result = ts.createSymbolTable();
-            for (var _i = 0, symbols_2 = symbols; _i < symbols_2.length; _i++) {
-                var symbol = symbols_2[_i];
+            for (var _i = 0, symbols_1 = symbols; _i < symbols_1.length; _i++) {
+                var symbol = symbols_1[_i];
                 result.set(symbol.escapedName, mappingThisOnly && isThisless(symbol) ? symbol : instantiateSymbol(symbol, mapper));
             }
             return result;
@@ -32063,9 +34479,9 @@ var ts;
                         // If we have an existing early-bound member, combine its declarations so that we can
                         // report an error at each declaration.
                         var declarations = earlySymbol ? ts.concatenate(earlySymbol.declarations, lateSymbol.declarations) : lateSymbol.declarations;
-                        var name_2 = ts.declarationNameToString(decl.name);
-                        ts.forEach(declarations, function (declaration) { return error(ts.getNameOfDeclaration(declaration) || declaration, ts.Diagnostics.Duplicate_declaration_0, name_2); });
-                        error(decl.name || decl, ts.Diagnostics.Duplicate_declaration_0, name_2);
+                        var name_1 = ts.declarationNameToString(decl.name);
+                        ts.forEach(declarations, function (declaration) { return error(ts.getNameOfDeclaration(declaration) || declaration, ts.Diagnostics.Duplicate_declaration_0, name_1); });
+                        error(decl.name || decl, ts.Diagnostics.Duplicate_declaration_0, name_1);
                         lateSymbol = createSymbol(0 /* None */, memberName, 1024 /* Late */);
                     }
                     lateSymbol.nameType = type;
@@ -32098,8 +34514,8 @@ var ts;
                     var decl = _a[_i];
                     var members = ts.getMembersOfDeclaration(decl);
                     if (members) {
-                        for (var _b = 0, members_4 = members; _b < members_4.length; _b++) {
-                            var member = members_4[_b];
+                        for (var _b = 0, members_3 = members; _b < members_3.length; _b++) {
+                            var member = members_3[_b];
                             if (isStatic === ts.hasStaticModifier(member) && hasLateBindableName(member)) {
                                 lateBindMember(symbol, earlySymbols, lateSymbols, member);
                             }
@@ -32375,7 +34791,7 @@ var ts;
             var numberIndexInfo;
             var types = type.types;
             var mixinCount = ts.countWhere(types, isMixinConstructorType);
-            var _loop_4 = function (i) {
+            var _loop_2 = function (i) {
                 var t = type.types[i];
                 // When an intersection type contains mixin constructor types, the construct signatures from
                 // those types are discarded and their return types are mixed into the return types of all
@@ -32398,7 +34814,7 @@ var ts;
                 numberIndexInfo = intersectIndexInfos(numberIndexInfo, getIndexInfoOfType(t, 1 /* Number */));
             };
             for (var i = 0; i < types.length; i++) {
-                _loop_4(i);
+                _loop_2(i);
             }
             setStructuredTypeMembers(type, emptySymbols, callSignatures, constructSignatures, stringIndexInfo, numberIndexInfo);
         }
@@ -33978,8 +36394,8 @@ var ts;
         function getTypeOfGlobalSymbol(symbol, arity) {
             function getTypeDeclaration(symbol) {
                 var declarations = symbol.declarations;
-                for (var _i = 0, declarations_3 = declarations; _i < declarations_3.length; _i++) {
-                    var declaration = declarations_3[_i];
+                for (var _i = 0, declarations_2 = declarations; _i < declarations_2.length; _i++) {
+                    var declaration = declarations_2[_i];
                     switch (declaration.kind) {
                         case 235 /* ClassDeclaration */:
                         case 236 /* InterfaceDeclaration */:
@@ -34440,7 +36856,7 @@ var ts;
             var unionType = types[unionIndex];
             var intersection = unionType.types;
             var i = types.length - 1;
-            var _loop_5 = function () {
+            var _loop_3 = function () {
                 var t = types[i];
                 if (t.flags & 67108864 /* UnionOfUnitTypes */) {
                     intersection = ts.filter(intersection, function (u) { return containsType(t.types, u); });
@@ -34449,7 +36865,7 @@ var ts;
                 i--;
             };
             while (i > unionIndex) {
-                _loop_5();
+                _loop_3();
             }
             if (intersection === unionType.types) {
                 return false;
@@ -34838,14 +37254,14 @@ var ts;
             var isDeferred = root.isDistributive && maybeTypeOfKind(checkType, 15794176 /* Instantiable */);
             var combinedMapper;
             if (root.inferTypeParameters) {
-                var context_1 = createInferenceContext(root.inferTypeParameters, /*signature*/ undefined, 0 /* None */);
+                var context = createInferenceContext(root.inferTypeParameters, /*signature*/ undefined, 0 /* None */);
                 if (!isDeferred) {
                     // We don't want inferences from constraints as they may cause us to eagerly resolve the
                     // conditional type instead of deferring resolution. Also, we always want strict function
                     // types rules (i.e. proper contravariance) for inferences.
-                    inferTypes(context_1.inferences, checkType, extendsType, 32 /* NoConstraints */ | 64 /* AlwaysStrict */);
+                    inferTypes(context.inferences, checkType, extendsType, 32 /* NoConstraints */ | 64 /* AlwaysStrict */);
                 }
-                combinedMapper = combineTypeMappers(mapper, context_1);
+                combinedMapper = combineTypeMappers(mapper, context);
             }
             if (!isDeferred) {
                 if (extendsType.flags & 3 /* AnyOrUnknown */) {
@@ -35013,12 +37429,13 @@ var ts;
             return links.resolvedType; // TODO: GH#18217
         }
         function resolveImportSymbolType(node, links, symbol, meaning) {
-            links.resolvedSymbol = symbol;
+            var resolvedSymbol = resolveSymbol(symbol);
+            links.resolvedSymbol = resolvedSymbol;
             if (meaning === 67216319 /* Value */) {
-                return links.resolvedType = getTypeOfSymbol(symbol);
+                return links.resolvedType = getTypeOfSymbol(symbol); // intentionally doesn't use resolved symbol so type is cached as expected on the alias
             }
             else {
-                return links.resolvedType = getTypeReferenceType(node, symbol);
+                return links.resolvedType = getTypeReferenceType(node, resolvedSymbol); // getTypeReferenceType doesn't handle aliases - it must get the resolved symbol
             }
         }
         function getTypeFromTypeLiteralOrFunctionOrConstructorTypeNode(node) {
@@ -35980,7 +38397,7 @@ var ts;
             return type.flags & 131072 /* Object */ ? isEmptyResolvedType(resolveStructuredTypeMembers(type)) :
                 type.flags & 16777216 /* NonPrimitive */ ? true :
                     type.flags & 262144 /* Union */ ? ts.some(type.types, isEmptyObjectType) :
-                        type.flags & 524288 /* Intersection */ ? !ts.some(type.types, function (t) { return !isEmptyObjectType(t); }) :
+                        type.flags & 524288 /* Intersection */ ? ts.every(type.types, isEmptyObjectType) :
                             false;
         }
         function isEnumTypeRelatedTo(sourceSymbol, targetSymbol, errorReporter) {
@@ -36395,7 +38812,7 @@ var ts;
                         // check excess properties against discriminant type only, not the entire union
                         return hasExcessProperties(source, discriminant, /*discriminant*/ undefined, reportErrors);
                     }
-                    var _loop_6 = function (prop) {
+                    var _loop_4 = function (prop) {
                         if (!isKnownProperty(target, prop.escapedName, isComparingJsxAttributes)) {
                             if (reportErrors) {
                                 // We know *exactly* where things went wrong when comparing the types.
@@ -36434,7 +38851,7 @@ var ts;
                     };
                     for (var _i = 0, _a = getPropertiesOfObjectType(source); _i < _a.length; _i++) {
                         var prop = _a[_i];
-                        var state_3 = _loop_6(prop);
+                        var state_3 = _loop_4(prop);
                         if (typeof state_3 === "object")
                             return state_3.value;
                     }
@@ -36880,10 +39297,10 @@ var ts;
                 var modifiersRelated = relation === comparableRelation || (relation === identityRelation ? getMappedTypeModifiers(source) === getMappedTypeModifiers(target) :
                     getCombinedMappedTypeOptionality(source) <= getCombinedMappedTypeOptionality(target));
                 if (modifiersRelated) {
-                    var result_2;
-                    if (result_2 = isRelatedTo(getConstraintTypeFromMappedType(target), getConstraintTypeFromMappedType(source), reportErrors)) {
+                    var result_1;
+                    if (result_1 = isRelatedTo(getConstraintTypeFromMappedType(target), getConstraintTypeFromMappedType(source), reportErrors)) {
                         var mapper = createTypeMapper([getTypeParameterFromMappedType(source)], [getTypeParameterFromMappedType(target)]);
-                        return result_2 & isRelatedTo(instantiateType(getTemplateTypeFromMappedType(source), mapper), getTemplateTypeFromMappedType(target), reportErrors);
+                        return result_1 & isRelatedTo(instantiateType(getTemplateTypeFromMappedType(source), mapper), getTemplateTypeFromMappedType(target), reportErrors);
                     }
                 }
                 return 0 /* False */;
@@ -37576,7 +39993,7 @@ var ts;
         }
         function isLiteralType(type) {
             return type.flags & 16 /* Boolean */ ? true :
-                type.flags & 262144 /* Union */ ? type.flags & 512 /* EnumLiteral */ ? true : !ts.forEach(type.types, function (t) { return !isUnitType(t); }) :
+                type.flags & 262144 /* Union */ ? type.flags & 512 /* EnumLiteral */ ? true : ts.every(type.types, isUnitType) :
                     isUnitType(type);
         }
         function getBaseTypeOfLiteralType(type) {
@@ -37768,6 +40185,19 @@ var ts;
             return context.resolvedProperties;
         }
         function getWidenedProperty(prop, context) {
+            if (!(prop.flags & 4 /* Property */)) {
+                // Since get accessors already widen their return value there is no need to
+                // widen accessor based properties here.
+                return prop;
+            }
+            if (prop.flags & 67108864 /* JSContainer */) {
+                var node = prop.declarations && ts.first(prop.declarations);
+                var init = ts.getAssignedJavascriptInitializer(node);
+                if (init && init.kind !== 184 /* ObjectLiteralExpression */) {
+                    // for JS special declarations, the only kind of initializer that will widen is object literals
+                    return prop;
+                }
+            }
             var original = getTypeOfSymbol(prop);
             var propContext = context && createWideningContext(context, prop.escapedName, /*siblings*/ undefined);
             var widened = getWidenedTypeWithContext(original, propContext);
@@ -37787,9 +40217,7 @@ var ts;
             var members = ts.createSymbolTable();
             for (var _i = 0, _a = getPropertiesOfObjectType(type); _i < _a.length; _i++) {
                 var prop = _a[_i];
-                // Since get accessors already widen their return value there is no need to
-                // widen accessor based properties here.
-                members.set(prop.escapedName, prop.flags & 4 /* Property */ ? getWidenedProperty(prop, context) : prop);
+                members.set(prop.escapedName, getWidenedProperty(prop, context));
             }
             if (context) {
                 for (var _b = 0, _c = getPropertiesOfContext(context); _b < _c.length; _b++) {
@@ -41295,10 +43723,10 @@ var ts;
                 var decl = ts.getDeclarationOfJSInitializer(node);
                 if (decl) {
                     // a JS object literal whose declaration's symbol has exports is a JS namespace
-                    var symbol = getMergedSymbol(decl.symbol);
+                    var symbol = getSymbolOfNode(decl);
                     if (symbol && ts.hasEntries(symbol.exports)) {
                         propertiesTable = symbol.exports;
-                        symbol.exports.forEach(function (symbol) { return propertiesArray.push(getMergedSymbol(symbol)); });
+                        symbol.exports.forEach(function (s) { return propertiesArray.push(getMergedSymbol(s)); });
                         return createObjectLiteralType();
                     }
                 }
@@ -41453,7 +43881,7 @@ var ts;
             return !!(type.flags & (3 /* AnyOrUnknown */ | 16777216 /* NonPrimitive */) ||
                 getFalsyFlags(type) & 29120 /* DefinitelyFalsy */ && isValidSpreadType(removeDefinitelyFalsyTypes(type)) ||
                 type.flags & 131072 /* Object */ && !isGenericMappedType(type) ||
-                type.flags & 786432 /* UnionOrIntersection */ && !ts.forEach(type.types, function (t) { return !isValidSpreadType(t); }));
+                type.flags & 786432 /* UnionOrIntersection */ && ts.every(type.types, isValidSpreadType));
         }
         function checkJsxSelfClosingElement(node, checkMode) {
             checkJsxOpeningLikeElementOrOpeningFragment(node, checkMode);
@@ -42199,7 +44627,7 @@ var ts;
                 // Assignability failure - check each prop individually, and if that fails, fall back on the bad error span
                 if (ts.length(openingLikeElement.attributes.properties)) {
                     var reportedError = false;
-                    var _loop_7 = function (prop) {
+                    var _loop_5 = function (prop) {
                         if (ts.isJsxSpreadAttribute(prop))
                             return "continue";
                         var name = ts.idText(prop.name);
@@ -42213,7 +44641,7 @@ var ts;
                     };
                     for (var _b = 0, _c = openingLikeElement.attributes.properties; _b < _c.length; _b++) {
                         var prop = _c[_b];
-                        _loop_7(prop);
+                        _loop_5(prop);
                     }
                     if (reportedError) {
                         return;
@@ -42574,84 +45002,11 @@ var ts;
          *         and 1 insertion/deletion at 3 characters)
          */
         function getSpellingSuggestionForName(name, symbols, meaning) {
-            var maximumLengthDifference = Math.min(2, Math.floor(name.length * 0.34));
-            var bestDistance = Math.floor(name.length * 0.4) + 1; // If the best result isn't better than this, don't bother.
-            var bestCandidate;
-            var justCheckExactMatches = false;
-            var nameLowerCase = name.toLowerCase();
-            for (var _i = 0, symbols_3 = symbols; _i < symbols_3.length; _i++) {
-                var candidate = symbols_3[_i];
+            return ts.getSpellingSuggestion(name, symbols, getCandidateName);
+            function getCandidateName(candidate) {
                 var candidateName = ts.symbolName(candidate);
-                if (candidateName.charCodeAt(0) === 34 /* doubleQuote */
-                    || !(candidate.flags & meaning && Math.abs(candidateName.length - nameLowerCase.length) <= maximumLengthDifference)) {
-                    continue;
-                }
-                var candidateNameLowerCase = candidateName.toLowerCase();
-                if (candidateNameLowerCase === nameLowerCase) {
-                    return candidate;
-                }
-                if (justCheckExactMatches) {
-                    continue;
-                }
-                if (candidateName.length < 3) {
-                    // Don't bother, user would have noticed a 2-character name having an extra character
-                    continue;
-                }
-                // Only care about a result better than the best so far.
-                var distance = levenshteinWithMax(nameLowerCase, candidateNameLowerCase, bestDistance - 1);
-                if (distance === undefined) {
-                    continue;
-                }
-                if (distance < 3) {
-                    justCheckExactMatches = true;
-                    bestCandidate = candidate;
-                }
-                else {
-                    ts.Debug.assert(distance < bestDistance); // Else `levenshteinWithMax` should return undefined
-                    bestDistance = distance;
-                    bestCandidate = candidate;
-                }
+                return !ts.startsWith(candidateName, "\"") && candidate.flags & meaning ? candidateName : undefined;
             }
-            return bestCandidate;
-        }
-        function levenshteinWithMax(s1, s2, max) {
-            var previous = new Array(s2.length + 1);
-            var current = new Array(s2.length + 1);
-            /** Represents any value > max. We don't care about the particular value. */
-            var big = max + 1;
-            for (var i = 0; i <= s2.length; i++) {
-                previous[i] = i;
-            }
-            for (var i = 1; i <= s1.length; i++) {
-                var c1 = s1.charCodeAt(i - 1);
-                var minJ = i > max ? i - max : 1;
-                var maxJ = s2.length > max + i ? max + i : s2.length;
-                current[0] = i;
-                /** Smallest value of the matrix in the ith column. */
-                var colMin = i;
-                for (var j = 1; j < minJ; j++) {
-                    current[j] = big;
-                }
-                for (var j = minJ; j <= maxJ; j++) {
-                    var dist = c1 === s2.charCodeAt(j - 1)
-                        ? previous[j - 1]
-                        : Math.min(/*delete*/ previous[j] + 1, /*insert*/ current[j - 1] + 1, /*substitute*/ previous[j - 1] + 2);
-                    current[j] = dist;
-                    colMin = Math.min(colMin, dist);
-                }
-                for (var j = maxJ + 1; j <= s2.length; j++) {
-                    current[j] = big;
-                }
-                if (colMin > max) {
-                    // Give up -- everything in this column is > max and it can't get better in future columns.
-                    return undefined;
-                }
-                var temp = previous;
-                previous = current;
-                current = temp;
-            }
-            var res = previous[s2.length];
-            return res > max ? undefined : res;
         }
         function markPropertyAsReferenced(prop, nodeForCheckWriteOnly, isThisAccess) {
             if (!prop || !(prop.flags & 106500 /* ClassMember */) || !prop.valueDeclaration || !ts.hasModifier(prop.valueDeclaration, 8 /* Private */)) {
@@ -43208,13 +45563,13 @@ var ts;
         function getEffectiveCallArguments(node) {
             if (node.kind === 189 /* TaggedTemplateExpression */) {
                 var template = node.template;
-                var args_4 = [undefined]; // TODO: GH#18217
+                var args_1 = [undefined]; // TODO: GH#18217
                 if (template.kind === 202 /* TemplateExpression */) {
                     ts.forEach(template.templateSpans, function (span) {
-                        args_4.push(span.expression);
+                        args_1.push(span.expression);
                     });
                 }
-                return args_4;
+                return args_1;
             }
             else if (node.kind === 150 /* Decorator */) {
                 // For a decorator, we return undefined as we will determine
@@ -43740,7 +46095,7 @@ var ts;
             if (node.expression.kind === 97 /* SuperKeyword */) {
                 var superType = checkSuperExpression(node.expression);
                 if (isTypeAny(superType)) {
-                    ts.forEach(node.arguments, checkExpression); // Still visit arguments so they get marked for visibility, etc
+                    ts.forEach(node.arguments, checkExpresionNoReturn); // Still visit arguments so they get marked for visibility, etc
                     return anySignature;
                 }
                 if (superType !== errorType) {
@@ -44254,8 +46609,8 @@ var ts;
             if (allowSyntheticDefaultImports && type && type !== errorType) {
                 var synthType = type;
                 if (!synthType.syntheticType) {
-                    var file_4 = ts.find(originalSymbol.declarations, ts.isSourceFile);
-                    var hasSyntheticDefault = canHaveSyntheticDefault(file_4, originalSymbol, /*dontResolveAlias*/ false);
+                    var file = ts.find(originalSymbol.declarations, ts.isSourceFile);
+                    var hasSyntheticDefault = canHaveSyntheticDefault(file, originalSymbol, /*dontResolveAlias*/ false);
                     if (hasSyntheticDefault) {
                         var memberTable = ts.createSymbolTable();
                         var newSymbol = createSymbol(2097152 /* Alias */, "default" /* Default */);
@@ -45020,7 +47375,6 @@ var ts;
         }
         function checkObjectLiteralAssignment(node, sourceType) {
             var properties = node.properties;
-            checkGrammarForDisallowedTrailingComma(properties, ts.Diagnostics.A_rest_parameter_or_binding_pattern_may_not_have_a_trailing_comma);
             if (strictNullChecks && properties.length === 0) {
                 return checkNonNullType(sourceType, node);
             }
@@ -45070,6 +47424,7 @@ var ts;
                     }
                 }
                 var type = getRestType(objectLiteralType, nonRestNames, objectLiteralType.symbol);
+                checkGrammarForDisallowedTrailingComma(allProperties, ts.Diagnostics.A_rest_parameter_or_binding_pattern_may_not_have_a_trailing_comma);
                 return checkDestructuringAssignment(property.expression, type);
             }
             else {
@@ -45078,7 +47433,6 @@ var ts;
         }
         function checkArrayLiteralAssignment(node, sourceType, checkMode) {
             var elements = node.elements;
-            checkGrammarForDisallowedTrailingComma(elements, ts.Diagnostics.A_rest_parameter_or_binding_pattern_may_not_have_a_trailing_comma);
             if (languageVersion < 2 /* ES2015 */ && compilerOptions.downlevelIteration) {
                 checkExternalEmitHelpers(node, 512 /* Read */);
             }
@@ -45127,6 +47481,7 @@ var ts;
                             error(restExpression.operatorToken, ts.Diagnostics.A_rest_element_cannot_have_an_initializer);
                         }
                         else {
+                            checkGrammarForDisallowedTrailingComma(node.elements, ts.Diagnostics.A_rest_parameter_or_binding_pattern_may_not_have_a_trailing_comma);
                             return checkDestructuringAssignment(restExpression, createArrayType(elementType), checkMode);
                         }
                     }
@@ -45392,7 +47747,7 @@ var ts;
                         if (propType.symbol && propType.symbol.flags & 32 /* Class */) {
                             var name = prop.escapedName;
                             var symbol = resolveName(prop.valueDeclaration, name, 67901928 /* Type */, undefined, name, /*isUse*/ false);
-                            if (symbol && symbol.declarations.some(function (d) { return d.kind === 297 /* JSDocTypedefTag */; })) {
+                            if (symbol && symbol.declarations.some(ts.isJSDocTypedefTag)) {
                                 grammarErrorOnNode(symbol.declarations[0], ts.Diagnostics.Duplicate_identifier_0, ts.unescapeLeadingUnderscores(name));
                                 return grammarErrorOnNode(prop.valueDeclaration, ts.Diagnostics.Duplicate_identifier_0, ts.unescapeLeadingUnderscores(name));
                             }
@@ -45691,6 +48046,9 @@ var ts;
             node.contextualType = saveContextualType;
             return type;
         }
+        function checkExpresionNoReturn(node) {
+            checkExpression(node);
+        }
         // Checks an expression and returns its type. The contextualMapper parameter serves two purposes: When
         // contextualMapper is not undefined and not equal to the identityMapper function object it indicates that the
         // expression is being inferentially typed (section 4.15.2 in spec) and provides the type mapper to use in
@@ -46623,8 +48981,8 @@ var ts;
             }
             var duplicateFunctionDeclaration = false;
             var multipleConstructorImplementation = false;
-            for (var _i = 0, declarations_4 = declarations; _i < declarations_4.length; _i++) {
-                var current = declarations_4[_i];
+            for (var _i = 0, declarations_3 = declarations; _i < declarations_3.length; _i++) {
+                var current = declarations_3[_i];
                 var node = current;
                 var inAmbientContext = node.flags & 4194304 /* Ambient */;
                 var inAmbientContextOrInterface = node.parent.kind === 236 /* InterfaceDeclaration */ || node.parent.kind === 166 /* TypeLiteral */ || inAmbientContext;
@@ -46793,10 +49151,10 @@ var ts;
                     case 243 /* ImportEqualsDeclaration */:
                     case 246 /* NamespaceImport */:
                     case 245 /* ImportClause */:
-                        var result_3 = 0 /* None */;
+                        var result_2 = 0 /* None */;
                         var target = resolveAlias(getSymbolOfNode(d));
-                        ts.forEach(target.declarations, function (d) { result_3 |= getDeclarationSpaces(d); });
-                        return result_3;
+                        ts.forEach(target.declarations, function (d) { result_2 |= getDeclarationSpaces(d); });
+                        return result_2;
                     case 232 /* VariableDeclaration */:
                     case 182 /* BindingElement */:
                     case 234 /* FunctionDeclaration */:
@@ -47593,8 +49951,8 @@ var ts;
                         : ts.createDiagnosticForNode(declarationList.parent.kind === 214 /* VariableStatement */ ? declarationList.parent : declarationList, ts.Diagnostics.All_variables_are_unused));
                 }
                 else {
-                    for (var _i = 0, declarations_5 = declarations; _i < declarations_5.length; _i++) {
-                        var decl = declarations_5[_i];
+                    for (var _i = 0, declarations_4 = declarations; _i < declarations_4.length; _i++) {
+                        var decl = declarations_4[_i];
                         addDiagnostic(0 /* Local */, ts.createDiagnosticForNode(decl, ts.Diagnostics._0_is_declared_but_its_value_is_never_read, ts.idText(ts.cast(decl.name, ts.isIdentifier))));
                     }
                 }
@@ -48778,8 +51136,8 @@ var ts;
                 if (!areTypeParametersIdentical(declarations, type.localTypeParameters)) {
                     // Report an error on every conflicting declaration.
                     var name = symbolToString(symbol);
-                    for (var _i = 0, declarations_6 = declarations; _i < declarations_6.length; _i++) {
-                        var declaration = declarations_6[_i];
+                    for (var _i = 0, declarations_5 = declarations; _i < declarations_5.length; _i++) {
+                        var declaration = declarations_5[_i];
                         error(declaration.name, ts.Diagnostics.All_declarations_of_0_must_have_identical_type_parameters, name);
                     }
                 }
@@ -48788,8 +51146,8 @@ var ts;
         function areTypeParametersIdentical(declarations, targetParameters) {
             var maxTypeArgumentCount = ts.length(targetParameters);
             var minTypeArgumentCount = getMinTypeArgumentCount(targetParameters);
-            for (var _i = 0, declarations_7 = declarations; _i < declarations_7.length; _i++) {
-                var declaration = declarations_7[_i];
+            for (var _i = 0, declarations_6 = declarations; _i < declarations_6.length; _i++) {
+                var declaration = declarations_6[_i];
                 // If this declaration has too few or too many type parameters, we report an error
                 var sourceParameters = ts.getEffectiveTypeParameterDeclarations(declaration);
                 var numTypeParameters = sourceParameters.length;
@@ -48943,7 +51301,7 @@ var ts;
         function issueMemberSpecificError(node, typeWithThis, baseWithThis, broadDiag) {
             // iterate over all implemented properties and issue errors on each one which isn't compatible, rather than the class as a whole, if possible
             var issuedMemberError = false;
-            var _loop_8 = function (member) {
+            var _loop_6 = function (member) {
                 if (ts.hasStaticModifier(member)) {
                     return "continue";
                 }
@@ -48962,7 +51320,7 @@ var ts;
             };
             for (var _i = 0, _a = node.members; _i < _a.length; _i++) {
                 var member = _a[_i];
-                _loop_8(member);
+                _loop_6(member);
             }
             if (!issuedMemberError) {
                 // check again with diagnostics to generate a less-specific error
@@ -49247,12 +51605,12 @@ var ts;
             function evaluate(expr) {
                 switch (expr.kind) {
                     case 198 /* PrefixUnaryExpression */:
-                        var value_2 = evaluate(expr.operand);
-                        if (typeof value_2 === "number") {
+                        var value_1 = evaluate(expr.operand);
+                        if (typeof value_1 === "number") {
                             switch (expr.operator) {
-                                case 37 /* PlusToken */: return value_2;
-                                case 38 /* MinusToken */: return -value_2;
-                                case 52 /* TildeToken */: return ~value_2;
+                                case 37 /* PlusToken */: return value_1;
+                                case 38 /* MinusToken */: return -value_1;
+                                case 52 /* TildeToken */: return ~value_1;
                             }
                         }
                         break;
@@ -49391,8 +51749,8 @@ var ts;
         }
         function getFirstNonAmbientClassOrFunctionDeclaration(symbol) {
             var declarations = symbol.declarations;
-            for (var _i = 0, declarations_8 = declarations; _i < declarations_8.length; _i++) {
-                var declaration = declarations_8[_i];
+            for (var _i = 0, declarations_7 = declarations; _i < declarations_7.length; _i++) {
+                var declaration = declarations_7[_i];
                 if ((declaration.kind === 235 /* ClassDeclaration */ ||
                     (declaration.kind === 234 /* FunctionDeclaration */ && ts.nodeIsPresent(declaration.body))) &&
                     !(declaration.flags & 4194304 /* Ambient */)) {
@@ -49815,9 +52173,9 @@ var ts;
                     }
                 }
                 // Checks for export * conflicts
-                var exports_1 = getExportsOfModule(moduleSymbol);
-                if (exports_1) {
-                    exports_1.forEach(function (_a, id) {
+                var exports = getExportsOfModule(moduleSymbol);
+                if (exports) {
+                    exports.forEach(function (_a, id) {
                         var declarations = _a.declarations, flags = _a.flags;
                         if (id === "__export") {
                             return;
@@ -49834,8 +52192,8 @@ var ts;
                             return;
                         }
                         if (exportedDeclarationsCount > 1) {
-                            for (var _i = 0, declarations_9 = declarations; _i < declarations_9.length; _i++) {
-                                var declaration = declarations_9[_i];
+                            for (var _i = 0, declarations_8 = declarations; _i < declarations_8.length; _i++) {
+                                var declaration = declarations_8[_i];
                                 if (isNotOverload(declaration)) {
                                     diagnostics.add(ts.createDiagnosticForNode(declaration, ts.Diagnostics.Cannot_redeclare_exported_variable_0, ts.unescapeLeadingUnderscores(id)));
                                 }
@@ -51300,8 +53658,8 @@ var ts;
                     var decl = _a[_i];
                     // check meaning of the local symbol to see if declaration needs to be analyzed further
                     if (decl.symbol && decl.symbol.flags & meaning) {
-                        var file_5 = ts.getSourceFileOfNode(decl);
-                        var typeReferenceDirective = fileToDirective.get(file_5.path);
+                        var file = ts.getSourceFileOfNode(decl);
+                        var typeReferenceDirective = fileToDirective.get(file.path);
                         if (typeReferenceDirective) {
                             (typeReferenceDirectives || (typeReferenceDirectives = [])).push(typeReferenceDirective);
                         }
@@ -51336,8 +53694,8 @@ var ts;
                 // check that at least one declaration of top level symbol originates from type declaration file
                 for (var _i = 0, _a = symbol.declarations; _i < _a.length; _i++) {
                     var decl = _a[_i];
-                    var file_6 = ts.getSourceFileOfNode(decl);
-                    if (fileToDirective.has(file_6.path)) {
+                    var file = ts.getSourceFileOfNode(decl);
+                    if (fileToDirective.has(file.path)) {
                         return true;
                     }
                 }
@@ -51355,25 +53713,25 @@ var ts;
         function initializeTypeChecker() {
             // Bind all source files and propagate errors
             for (var _i = 0, _a = host.getSourceFiles(); _i < _a.length; _i++) {
-                var file_7 = _a[_i];
-                ts.bindSourceFile(file_7, compilerOptions);
+                var file = _a[_i];
+                ts.bindSourceFile(file, compilerOptions);
             }
             // Initialize global symbol table
             var augmentations;
             for (var _b = 0, _c = host.getSourceFiles(); _b < _c.length; _b++) {
-                var file_8 = _c[_b];
-                if (!ts.isExternalOrCommonJsModule(file_8)) {
-                    mergeSymbolTable(globals, file_8.locals);
+                var file = _c[_b];
+                if (!ts.isExternalOrCommonJsModule(file)) {
+                    mergeSymbolTable(globals, file.locals);
                 }
-                if (file_8.patternAmbientModules && file_8.patternAmbientModules.length) {
-                    patternAmbientModules = ts.concatenate(patternAmbientModules, file_8.patternAmbientModules);
+                if (file.patternAmbientModules && file.patternAmbientModules.length) {
+                    patternAmbientModules = ts.concatenate(patternAmbientModules, file.patternAmbientModules);
                 }
-                if (file_8.moduleAugmentations.length) {
-                    (augmentations || (augmentations = [])).push(file_8.moduleAugmentations);
+                if (file.moduleAugmentations.length) {
+                    (augmentations || (augmentations = [])).push(file.moduleAugmentations);
                 }
-                if (file_8.symbol && file_8.symbol.globalExports) {
+                if (file.symbol && file.symbol.globalExports) {
                     // Merge in UMD exports with first-in-wins semantics (see #9771)
-                    var source = file_8.symbol.globalExports;
+                    var source = file.symbol.globalExports;
                     source.forEach(function (sourceSymbol, id) {
                         if (!globals.has(id)) {
                             globals.set(id, sourceSymbol);
@@ -51898,8 +54256,8 @@ var ts;
         }
         function checkGrammarForOmittedArgument(args) {
             if (args) {
-                for (var _i = 0, args_5 = args; _i < args_5.length; _i++) {
-                    var arg = args_5[_i];
+                for (var _i = 0, args_2 = args; _i < args_2.length; _i++) {
+                    var arg = args_2[_i];
                     if (arg.kind === 206 /* OmittedExpression */) {
                         return grammarErrorAtPos(arg, arg.pos, 0, ts.Diagnostics.Argument_expression_expected);
                     }
@@ -54885,11 +57243,12 @@ var ts;
     }
     ts.updateEnumMember = updateEnumMember;
     // Top-level nodes
-    function updateSourceFileNode(node, statements, isDeclarationFile, referencedFiles, typeReferences, hasNoDefaultLib) {
+    function updateSourceFileNode(node, statements, isDeclarationFile, referencedFiles, typeReferences, hasNoDefaultLib, libReferences) {
         if (node.statements !== statements ||
             (isDeclarationFile !== undefined && node.isDeclarationFile !== isDeclarationFile) ||
             (referencedFiles !== undefined && node.referencedFiles !== referencedFiles) ||
             (typeReferences !== undefined && node.typeReferenceDirectives !== typeReferences) ||
+            (libReferences !== undefined && node.libReferenceDirectives !== libReferences) ||
             (hasNoDefaultLib !== undefined && node.hasNoDefaultLib !== hasNoDefaultLib)) {
             var updated = createSynthesizedNode(274 /* SourceFile */);
             updated.flags |= node.flags;
@@ -54902,6 +57261,7 @@ var ts;
             updated.referencedFiles = referencedFiles === undefined ? node.referencedFiles : referencedFiles;
             updated.typeReferenceDirectives = typeReferences === undefined ? node.typeReferenceDirectives : typeReferences;
             updated.hasNoDefaultLib = hasNoDefaultLib === undefined ? node.hasNoDefaultLib : hasNoDefaultLib;
+            updated.libReferenceDirectives = libReferences === undefined ? node.libReferenceDirectives : libReferences;
             if (node.amdDependencies !== undefined)
                 updated.amdDependencies = node.amdDependencies;
             if (node.moduleName !== undefined)
@@ -55058,16 +57418,19 @@ var ts;
         return node;
     }
     ts.createBundle = createBundle;
-    function createUnparsedSourceFile(text) {
+    function createUnparsedSourceFile(text, map) {
         var node = ts.createNode(276 /* UnparsedSource */);
         node.text = text;
+        node.sourceMapText = map;
         return node;
     }
     ts.createUnparsedSourceFile = createUnparsedSourceFile;
-    function createInputFiles(javascript, declaration) {
+    function createInputFiles(javascript, declaration, javascriptMapText, declarationMapText) {
         var node = ts.createNode(277 /* InputFiles */);
         node.javascriptText = javascript;
+        node.javascriptMapText = javascriptMapText;
         node.declarationText = declaration;
+        node.declarationMapText = declarationMapText;
         return node;
     }
     ts.createInputFiles = createInputFiles;
@@ -57865,8 +60228,8 @@ var ts;
         }
         var subtreeFlags = 0 /* None */;
         var nodeArrayFlags = 0 /* None */;
-        for (var _i = 0, nodes_3 = nodes; _i < nodes_3.length; _i++) {
-            var node = nodes_3[_i];
+        for (var _i = 0, nodes_2 = nodes; _i < nodes_2.length; _i++) {
+            var node = nodes_2[_i];
             subtreeFlags |= aggregateTransformFlagsForNode(node);
             nodeArrayFlags |= node.transformFlags & ~536870912 /* HasComputedFlags */;
         }
@@ -58762,7 +61125,7 @@ var ts;
         function transformBundle(node) {
             return ts.createBundle(node.sourceFiles.map(transformSourceFile), ts.mapDefined(node.prepends, function (prepend) {
                 if (prepend.kind === 277 /* InputFiles */) {
-                    return ts.createUnparsedSourceFile(prepend.javascriptText);
+                    return ts.createUnparsedSourceFile(prepend.javascriptText, prepend.javascriptMapText);
                 }
                 return prepend;
             }));
@@ -59931,8 +62294,8 @@ var ts;
         function generateClassElementDecorationExpressions(node, isStatic) {
             var members = getDecoratedClassElements(node, isStatic);
             var expressions;
-            for (var _i = 0, members_5 = members; _i < members_5.length; _i++) {
-                var member = members_5[_i];
+            for (var _i = 0, members_4 = members; _i < members_4.length; _i++) {
+                var member = members_4[_i];
                 var expression = generateClassElementDecorationExpression(node, member);
                 if (expression) {
                     if (!expressions) {
@@ -60295,6 +62658,7 @@ var ts;
                 case 119 /* AnyKeyword */:
                 case 142 /* UnknownKeyword */:
                 case 174 /* ThisType */:
+                case 179 /* ImportType */:
                     break;
                 default:
                     return ts.Debug.failBadSyntaxKind(node);
@@ -64623,6 +66987,7 @@ var ts;
             var singleLine = false; // indicates whether the block *may* be emitted as a single line
             var statementsLocation;
             var closeBraceLocation;
+            var leadingStatements = [];
             var statements = [];
             var body = node.body;
             var statementOffset;
@@ -64630,18 +66995,14 @@ var ts;
             if (ts.isBlock(body)) {
                 // ensureUseStrict is false because no new prologue-directive should be added.
                 // addStandardPrologue will put already-existing directives at the beginning of the target statement-array
-                statementOffset = ts.addStandardPrologue(statements, body.statements, /*ensureUseStrict*/ false);
-            }
-            addCaptureThisForNodeIfNeeded(statements, node);
-            addDefaultValueAssignmentsIfNeeded(statements, node);
-            addRestParameterIfNeeded(statements, node, /*inConstructorWithSynthesizedSuper*/ false);
-            // If we added any generated statements, this must be a multi-line block.
-            if (!multiLine && statements.length > 0) {
-                multiLine = true;
+                statementOffset = ts.addStandardPrologue(leadingStatements, body.statements, /*ensureUseStrict*/ false);
             }
+            addCaptureThisForNodeIfNeeded(leadingStatements, node);
+            addDefaultValueAssignmentsIfNeeded(leadingStatements, node);
+            addRestParameterIfNeeded(leadingStatements, node, /*inConstructorWithSynthesizedSuper*/ false);
             if (ts.isBlock(body)) {
                 // addCustomPrologue puts already-existing directives at the beginning of the target statement-array
-                statementOffset = ts.addCustomPrologue(statements, body.statements, statementOffset, visitor);
+                statementOffset = ts.addCustomPrologue(leadingStatements, body.statements, statementOffset, visitor);
                 statementsLocation = body.statements;
                 ts.addRange(statements, ts.visitNodes(body.statements, visitor, ts.isStatement, statementOffset));
                 // If the original body was a multi-line block, this must be a multi-line block.
@@ -64679,10 +67040,10 @@ var ts;
             ts.prependStatements(statements, lexicalEnvironment);
             prependCaptureNewTargetIfNeeded(statements, node, /*copyOnWrite*/ false);
             // If we added any final generated statements, this must be a multi-line block
-            if (!multiLine && lexicalEnvironment && lexicalEnvironment.length) {
+            if (ts.some(leadingStatements) || ts.some(lexicalEnvironment)) {
                 multiLine = true;
             }
-            var block = ts.createBlock(ts.setTextRange(ts.createNodeArray(statements), statementsLocation), multiLine);
+            var block = ts.createBlock(ts.setTextRange(ts.createNodeArray(leadingStatements.concat(statements)), statementsLocation), multiLine);
             ts.setTextRange(block, node.body);
             if (!multiLine && singleLine) {
                 ts.setEmitFlags(block, 1 /* SingleLine */);
@@ -72476,8 +74837,8 @@ var ts;
                 return;
             }
             necessaryTypeRefernces = necessaryTypeRefernces || ts.createMap();
-            for (var _i = 0, typeReferenceDirectives_2 = typeReferenceDirectives; _i < typeReferenceDirectives_2.length; _i++) {
-                var ref = typeReferenceDirectives_2[_i];
+            for (var _i = 0, typeReferenceDirectives_1 = typeReferenceDirectives; _i < typeReferenceDirectives_1.length; _i++) {
+                var ref = typeReferenceDirectives_1[_i];
                 necessaryTypeRefernces.set(ref, true);
             }
         }
@@ -72560,15 +74921,15 @@ var ts;
                         resultHasExternalModuleIndicator = false; // unused in external module bundle emit (all external modules are within module blocks, therefore are known to be modules)
                         needsDeclare = false;
                         var statements_5 = ts.visitNodes(sourceFile.statements, visitDeclarationStatements);
-                        var newFile = ts.updateSourceFileNode(sourceFile, [ts.createModuleDeclaration([], [ts.createModifier(124 /* DeclareKeyword */)], ts.createLiteral(ts.getResolvedExternalModuleName(context.getEmitHost(), sourceFile)), ts.createModuleBlock(ts.setTextRange(ts.createNodeArray(transformAndReplaceLatePaintedStatements(statements_5)), sourceFile.statements)))], /*isDeclarationFile*/ true, /*referencedFiles*/ [], /*typeReferences*/ [], /*hasNoDefaultLib*/ false);
+                        var newFile = ts.updateSourceFileNode(sourceFile, [ts.createModuleDeclaration([], [ts.createModifier(124 /* DeclareKeyword */)], ts.createLiteral(ts.getResolvedExternalModuleName(context.getEmitHost(), sourceFile)), ts.createModuleBlock(ts.setTextRange(ts.createNodeArray(transformAndReplaceLatePaintedStatements(statements_5)), sourceFile.statements)))], /*isDeclarationFile*/ true, /*referencedFiles*/ [], /*typeReferences*/ [], /*hasNoDefaultLib*/ false, /*libReferences*/ []);
                         return newFile;
                     }
                     needsDeclare = true;
                     var updated = ts.visitNodes(sourceFile.statements, visitDeclarationStatements);
-                    return ts.updateSourceFileNode(sourceFile, transformAndReplaceLatePaintedStatements(updated), /*isDeclarationFile*/ true, /*referencedFiles*/ [], /*typeReferences*/ [], /*hasNoDefaultLib*/ false);
+                    return ts.updateSourceFileNode(sourceFile, transformAndReplaceLatePaintedStatements(updated), /*isDeclarationFile*/ true, /*referencedFiles*/ [], /*typeReferences*/ [], /*hasNoDefaultLib*/ false, /*libReferences*/ []);
                 }), ts.mapDefined(node.prepends, function (prepend) {
                     if (prepend.kind === 277 /* InputFiles */) {
-                        return ts.createUnparsedSourceFile(prepend.declarationText);
+                        return ts.createUnparsedSourceFile(prepend.declarationText, prepend.declarationMapText);
                     }
                 }));
                 bundle.syntheticFileReferences = [];
@@ -73385,7 +75746,7 @@ var ts;
             var prop = ts.createProperty(/*decorators*/ undefined, maskModifiers(node, /*mask*/ undefined, (!accessors.setAccessor) ? 64 /* Readonly */ : 0 /* None */), node.name, node.questionToken, ensureType(node, accessorType), /*initializer*/ undefined);
             var leadingsSyntheticCommentRanges = accessors.secondAccessor && ts.getLeadingCommentRangesOfNode(accessors.secondAccessor, currentSourceFile);
             if (leadingsSyntheticCommentRanges) {
-                var _loop_9 = function (range) {
+                var _loop_7 = function (range) {
                     if (range.kind === 3 /* MultiLineCommentTrivia */) {
                         var text = currentSourceFile.text.slice(range.pos + 2, range.end - 2);
                         var lines = text.split(/\r\n?|\n/g);
@@ -73399,7 +75760,7 @@ var ts;
                 };
                 for (var _i = 0, leadingsSyntheticCommentRanges_1 = leadingsSyntheticCommentRanges; _i < leadingsSyntheticCommentRanges_1.length; _i++) {
                     var range = leadingsSyntheticCommentRanges_1[_i];
-                    _loop_9(range);
+                    _loop_7(range);
                 }
             }
             return prop;
@@ -73608,8 +75969,8 @@ var ts;
             }
         };
         // Ensure the parse tree is clean before applying transformations
-        for (var _i = 0, nodes_4 = nodes; _i < nodes_4.length; _i++) {
-            var node = nodes_4[_i];
+        for (var _i = 0, nodes_3 = nodes; _i < nodes_3.length; _i++) {
+            var node = nodes_3[_i];
             ts.disposeEmitNodes(ts.getSourceFileOfNode(ts.getParseTreeNode(node)));
         }
         ts.performance.mark("beforeTransform");
@@ -73800,8 +76161,8 @@ var ts;
         function dispose() {
             if (state < 3 /* Disposed */) {
                 // Clean up emit nodes on parse tree
-                for (var _i = 0, nodes_5 = nodes; _i < nodes_5.length; _i++) {
-                    var node = nodes_5[_i];
+                for (var _i = 0, nodes_4 = nodes; _i < nodes_4.length; _i++) {
+                    var node = nodes_4[_i];
                     ts.disposeEmitNodes(ts.getSourceFileOfNode(ts.getParseTreeNode(node)));
                 }
                 // Release references to external entries for GC purposes.
@@ -73846,6 +76207,9 @@ var ts;
         var sourceMapData;
         var sourceMapDataList;
         var disabled = !(compilerOptions.sourceMap || compilerOptions.inlineSourceMap);
+        var completedSections;
+        var sectionStartLine;
+        var sectionStartColumn;
         return {
             initialize: initialize,
             reset: reset,
@@ -73886,6 +76250,9 @@ var ts;
             lastEncodedSourceMapSpan = defaultLastEncodedSourceMapSpan;
             lastEncodedNameIndex = 0;
             // Initialize source map data
+            completedSections = [];
+            sectionStartLine = 1;
+            sectionStartColumn = 1;
             sourceMapData = {
                 sourceMapFilePath: sourceMapFilePath,
                 jsSourceMappingURL: !compilerOptions.inlineSourceMap ? ts.getBaseFileName(ts.normalizeSlashes(sourceMapFilePath)) : undefined,
@@ -73946,6 +76313,39 @@ var ts;
             lastEncodedNameIndex = undefined;
             sourceMapData = undefined;
             sourceMapDataList = undefined;
+            completedSections = undefined;
+            sectionStartLine = undefined;
+            sectionStartColumn = undefined;
+        }
+        function captureSection() {
+            return {
+                version: 3,
+                file: sourceMapData.sourceMapFile,
+                sourceRoot: sourceMapData.sourceMapSourceRoot,
+                sources: sourceMapData.sourceMapSources,
+                names: sourceMapData.sourceMapNames,
+                mappings: sourceMapData.sourceMapMappings,
+                sourcesContent: sourceMapData.sourceMapSourcesContent,
+            };
+        }
+        function resetSectionalData() {
+            sourceMapData.sourceMapSources = [];
+            sourceMapData.sourceMapNames = [];
+            sourceMapData.sourceMapMappings = "";
+            sourceMapData.sourceMapSourcesContent = compilerOptions.inlineSources ? [] : undefined;
+        }
+        function generateMap() {
+            if (completedSections.length) {
+                captureSectionalSpanIfNeeded(/*reset*/ false);
+                return {
+                    version: 3,
+                    file: sourceMapData.sourceMapFile,
+                    sections: completedSections
+                };
+            }
+            else {
+                return captureSection();
+            }
         }
         // Encoding for sourcemap span
         function encodeLastRecordedSourceMapSpan() {
@@ -74003,8 +76403,8 @@ var ts;
             // Convert the location to be one-based.
             sourceLinePos.line++;
             sourceLinePos.character++;
-            var emittedLine = writer.getLine();
-            var emittedColumn = writer.getColumn();
+            var emittedLine = writer.getLine() - sectionStartLine + 1;
+            var emittedColumn = emittedLine === 0 ? (writer.getColumn() - sectionStartColumn + 1) : writer.getColumn();
             // If this location wasn't recorded or the location in source is going backwards, record the span
             if (!lastRecordedSourceMapSpan ||
                 lastRecordedSourceMapSpan.emittedLine !== emittedLine ||
@@ -74034,6 +76434,14 @@ var ts;
                 ts.performance.measure("Source Map", "beforeSourcemap", "afterSourcemap");
             }
         }
+        function captureSectionalSpanIfNeeded(reset) {
+            if (lastRecordedSourceMapSpan && lastRecordedSourceMapSpan === lastEncodedSourceMapSpan) { // If we've recorded some spans, save them
+                completedSections.push({ offset: { line: sectionStartLine - 1, column: sectionStartColumn - 1 }, map: captureSection() });
+                if (reset) {
+                    resetSectionalData();
+                }
+            }
+        }
         /**
          * Emits a node with possible leading and trailing source maps.
          *
@@ -74046,10 +76454,38 @@ var ts;
                 return emitCallback(hint, node);
             }
             if (node) {
+                if (ts.isUnparsedSource(node) && node.sourceMapText !== undefined) {
+                    captureSectionalSpanIfNeeded(/*reset*/ true);
+                    var text = node.sourceMapText;
+                    var parsed = void 0;
+                    try {
+                        parsed = JSON.parse(text);
+                    }
+                    catch (_a) {
+                        // empty
+                    }
+                    var offset = { line: writer.getLine() - 1, column: writer.getColumn() - 1 };
+                    completedSections.push(parsed
+                        ? {
+                            offset: offset,
+                            map: parsed
+                        }
+                        : {
+                            offset: offset,
+                            // This is just passes the buck on sourcemaps we don't really understand, instead of issuing an error (which would be difficult this late)
+                            url: "data:application/json;charset=utf-8;base64," + ts.base64encode(ts.sys, text)
+                        });
+                    var emitResult = emitCallback(hint, node);
+                    sectionStartLine = writer.getLine();
+                    sectionStartColumn = writer.getColumn();
+                    lastRecordedSourceMapSpan = undefined;
+                    lastEncodedSourceMapSpan = defaultLastEncodedSourceMapSpan;
+                    return emitResult;
+                }
                 var emitNode = node.emitNode;
                 var emitFlags = emitNode && emitNode.flags || 0 /* None */;
                 var range = emitNode && emitNode.sourceMapRange;
-                var _a = range || node, pos = _a.pos, end = _a.end;
+                var _b = range || node, pos = _b.pos, end = _b.end;
                 var source = range && range.source;
                 var oldSource = currentSource;
                 if (source === oldSource)
@@ -74151,15 +76587,7 @@ var ts;
                 return undefined; // TODO: GH#18217
             }
             encodeLastRecordedSourceMapSpan();
-            return JSON.stringify({
-                version: 3,
-                file: sourceMapData.sourceMapFile,
-                sourceRoot: sourceMapData.sourceMapSourceRoot,
-                sources: sourceMapData.sourceMapSources,
-                names: sourceMapData.sourceMapNames,
-                mappings: sourceMapData.sourceMapMappings,
-                sourcesContent: sourceMapData.sourceMapSourcesContent,
-            });
+            return JSON.stringify(generateMap());
         }
         /**
          * Gets the SourceMappingURL for the source map.
@@ -75489,7 +77917,7 @@ var ts;
         }
         // SyntaxKind.UnparsedSource
         function emitUnparsedSource(unparsed) {
-            write(unparsed.text);
+            writer.rawWrite(unparsed.text);
         }
         //
         // Identifiers
@@ -77290,8 +79718,8 @@ var ts;
         function writeLines(text) {
             var lines = text.split(/\r\n?|\n/g);
             var indentation = ts.guessIndentation(lines);
-            for (var _a = 0, lines_2 = lines; _a < lines_2.length; _a++) {
-                var lineText = lines_2[_a];
+            for (var _a = 0, lines_1 = lines; _a < lines_1.length; _a++) {
+                var lineText = lines_1[_a];
                 var line = indentation ? lineText.slice(indentation) : lineText;
                 if (line.length) {
                     writeLine();
@@ -78304,7 +80732,10 @@ var ts;
             getEnvironmentVariable: function (name) { return ts.sys.getEnvironmentVariable ? ts.sys.getEnvironmentVariable(name) : ""; },
             getDirectories: function (path) { return ts.sys.getDirectories(path); },
             realpath: realpath,
-            readDirectory: function (path, extensions, include, exclude, depth) { return ts.sys.readDirectory(path, extensions, include, exclude, depth); }
+            readDirectory: function (path, extensions, include, exclude, depth) { return ts.sys.readDirectory(path, extensions, include, exclude, depth); },
+            getModifiedTime: ts.sys.getModifiedTime && (function (path) { return ts.sys.getModifiedTime(path); }),
+            setModifiedTime: ts.sys.setModifiedTime && (function (path, date) { return ts.sys.setModifiedTime(path, date); }),
+            deleteFile: ts.sys.deleteFile && (function (path) { return ts.sys.deleteFile(path); })
         };
     }
     ts.createCompilerHost = createCompilerHost;
@@ -78372,52 +80803,52 @@ var ts;
         var output = "";
         for (var _i = 0, diagnostics_2 = diagnostics; _i < diagnostics_2.length; _i++) {
             var diagnostic = diagnostics_2[_i];
-            var context_2 = "";
+            var context = "";
             if (diagnostic.file) {
-                var start = diagnostic.start, length_4 = diagnostic.length, file_9 = diagnostic.file;
-                var _a = ts.getLineAndCharacterOfPosition(file_9, start), firstLine = _a.line, firstLineChar = _a.character; // TODO: GH#18217
-                var _b = ts.getLineAndCharacterOfPosition(file_9, start + length_4), lastLine = _b.line, lastLineChar = _b.character;
-                var lastLineInFile = ts.getLineAndCharacterOfPosition(file_9, file_9.text.length).line;
-                var relativeFileName = host ? ts.convertToRelativePath(file_9.fileName, host.getCurrentDirectory(), function (fileName) { return host.getCanonicalFileName(fileName); }) : file_9.fileName;
+                var start = diagnostic.start, length_4 = diagnostic.length, file = diagnostic.file;
+                var _a = ts.getLineAndCharacterOfPosition(file, start), firstLine = _a.line, firstLineChar = _a.character; // TODO: GH#18217
+                var _b = ts.getLineAndCharacterOfPosition(file, start + length_4), lastLine = _b.line, lastLineChar = _b.character;
+                var lastLineInFile = ts.getLineAndCharacterOfPosition(file, file.text.length).line;
+                var relativeFileName = host ? ts.convertToRelativePath(file.fileName, host.getCurrentDirectory(), function (fileName) { return host.getCanonicalFileName(fileName); }) : file.fileName;
                 var hasMoreThanFiveLines = (lastLine - firstLine) >= 4;
                 var gutterWidth = (lastLine + 1 + "").length;
                 if (hasMoreThanFiveLines) {
                     gutterWidth = Math.max(ellipsis.length, gutterWidth);
                 }
                 for (var i = firstLine; i <= lastLine; i++) {
-                    context_2 += host.getNewLine();
+                    context += host.getNewLine();
                     // If the error spans over 5 lines, we'll only show the first 2 and last 2 lines,
                     // so we'll skip ahead to the second-to-last line.
                     if (hasMoreThanFiveLines && firstLine + 1 < i && i < lastLine - 1) {
-                        context_2 += formatColorAndReset(padLeft(ellipsis, gutterWidth), gutterStyleSequence) + gutterSeparator + host.getNewLine();
+                        context += formatColorAndReset(padLeft(ellipsis, gutterWidth), gutterStyleSequence) + gutterSeparator + host.getNewLine();
                         i = lastLine - 1;
                     }
-                    var lineStart = ts.getPositionOfLineAndCharacter(file_9, i, 0);
-                    var lineEnd = i < lastLineInFile ? ts.getPositionOfLineAndCharacter(file_9, i + 1, 0) : file_9.text.length;
-                    var lineContent = file_9.text.slice(lineStart, lineEnd);
+                    var lineStart = ts.getPositionOfLineAndCharacter(file, i, 0);
+                    var lineEnd = i < lastLineInFile ? ts.getPositionOfLineAndCharacter(file, i + 1, 0) : file.text.length;
+                    var lineContent = file.text.slice(lineStart, lineEnd);
                     lineContent = lineContent.replace(/\s+$/g, ""); // trim from end
                     lineContent = lineContent.replace("\t", " "); // convert tabs to single spaces
                     // Output the gutter and the actual contents of the line.
-                    context_2 += formatColorAndReset(padLeft(i + 1 + "", gutterWidth), gutterStyleSequence) + gutterSeparator;
-                    context_2 += lineContent + host.getNewLine();
+                    context += formatColorAndReset(padLeft(i + 1 + "", gutterWidth), gutterStyleSequence) + gutterSeparator;
+                    context += lineContent + host.getNewLine();
                     // Output the gutter and the error span for the line using tildes.
-                    context_2 += formatColorAndReset(padLeft("", gutterWidth), gutterStyleSequence) + gutterSeparator;
-                    context_2 += ForegroundColorEscapeSequences.Red;
+                    context += formatColorAndReset(padLeft("", gutterWidth), gutterStyleSequence) + gutterSeparator;
+                    context += ForegroundColorEscapeSequences.Red;
                     if (i === firstLine) {
                         // If we're on the last line, then limit it to the last character of the last line.
                         // Otherwise, we'll just squiggle the rest of the line, giving 'slice' no end position.
                         var lastCharForLine = i === lastLine ? lastLineChar : undefined;
-                        context_2 += lineContent.slice(0, firstLineChar).replace(/\S/g, " ");
-                        context_2 += lineContent.slice(firstLineChar, lastCharForLine).replace(/./g, "~");
+                        context += lineContent.slice(0, firstLineChar).replace(/\S/g, " ");
+                        context += lineContent.slice(firstLineChar, lastCharForLine).replace(/./g, "~");
                     }
                     else if (i === lastLine) {
-                        context_2 += lineContent.slice(0, lastLineChar).replace(/./g, "~");
+                        context += lineContent.slice(0, lastLineChar).replace(/./g, "~");
                     }
                     else {
                         // Squiggle the entire line.
-                        context_2 += lineContent.replace(/./g, "~");
+                        context += lineContent.replace(/./g, "~");
                     }
-                    context_2 += resetEscapeSequence;
+                    context += resetEscapeSequence;
                 }
                 output += formatColorAndReset(relativeFileName, ForegroundColorEscapeSequences.Cyan);
                 output += ":";
@@ -78431,11 +80862,11 @@ var ts;
             output += flattenDiagnosticMessageText(diagnostic.messageText, host.getNewLine());
             if (diagnostic.file) {
                 output += host.getNewLine();
-                output += context_2;
+                output += context;
             }
             output += host.getNewLine();
         }
-        return output + host.getNewLine();
+        return output;
     }
     ts.formatDiagnosticsWithColorAndContext = formatDiagnosticsWithColorAndContext;
     function flattenDiagnosticMessageText(messageText, newLine) {
@@ -78554,7 +80985,9 @@ var ts;
         var rootNames = createProgramOptions.rootNames, options = createProgramOptions.options, configFileParsingDiagnostics = createProgramOptions.configFileParsingDiagnostics, projectReferences = createProgramOptions.projectReferences;
         var oldProgram = createProgramOptions.oldProgram;
         var program;
-        var files = [];
+        var processingDefaultLibFiles;
+        var processingOtherFiles;
+        var files;
         var commonSourceDirectory;
         var diagnosticsProducingTypeChecker;
         var noDiagnosticsTypeChecker;
@@ -78633,24 +81066,26 @@ var ts;
         // A parallel array to projectReferences storing the results of reading in the referenced tsconfig files
         var resolvedProjectReferences = projectReferences ? [] : undefined;
         var projectReferenceRedirects = ts.createMap();
-        if (projectReferences) {
-            for (var _i = 0, projectReferences_1 = projectReferences; _i < projectReferences_1.length; _i++) {
-                var ref = projectReferences_1[_i];
-                var parsedRef = parseProjectReferenceConfigFile(ref);
-                resolvedProjectReferences.push(parsedRef);
-                if (parsedRef) {
-                    if (parsedRef.commandLine.options.outFile) {
-                        var dtsOutfile = ts.changeExtension(parsedRef.commandLine.options.outFile, ".d.ts");
-                        processSourceFile(dtsOutfile, /*isDefaultLib*/ false, /*packageId*/ undefined);
-                    }
-                    addProjectReferenceRedirects(parsedRef.commandLine, projectReferenceRedirects);
-                }
-            }
-        }
         var shouldCreateNewSourceFile = shouldProgramCreateNewSourceFiles(oldProgram, options);
         var structuralIsReused = tryReuseStructureFromOldProgram();
         if (structuralIsReused !== 2 /* Completely */) {
-            ts.forEach(rootNames, function (name) { return processRootFile(name, /*isDefaultLib*/ false); });
+            processingDefaultLibFiles = [];
+            processingOtherFiles = [];
+            if (projectReferences) {
+                for (var _i = 0, projectReferences_1 = projectReferences; _i < projectReferences_1.length; _i++) {
+                    var ref = projectReferences_1[_i];
+                    var parsedRef = parseProjectReferenceConfigFile(ref);
+                    resolvedProjectReferences.push(parsedRef);
+                    if (parsedRef) {
+                        if (parsedRef.commandLine.options.outFile) {
+                            var dtsOutfile = ts.changeExtension(parsedRef.commandLine.options.outFile, ".d.ts");
+                            processSourceFile(dtsOutfile, /*isDefaultLib*/ false, /*ignoreNoDefaultLib*/ false, /*packageId*/ undefined);
+                        }
+                        addProjectReferenceRedirects(parsedRef.commandLine, projectReferenceRedirects);
+                    }
+                }
+            }
+            ts.forEach(rootNames, function (name) { return processRootFile(name, /*isDefaultLib*/ false, /*ignoreNoDefaultLib*/ false); });
             // load type declarations specified via 'types' argument or implicitly from types/ and node_modules/@types folders
             var typeReferences = ts.getAutomaticTypeDirectiveNames(options, host);
             if (typeReferences.length) {
@@ -78671,15 +81106,18 @@ var ts;
                 // otherwise, using options specified in '--lib' instead of '--target' default library file
                 var defaultLibraryFileName = getDefaultLibraryFileName();
                 if (!options.lib && defaultLibraryFileName) {
-                    processRootFile(defaultLibraryFileName, /*isDefaultLib*/ true);
+                    processRootFile(defaultLibraryFileName, /*isDefaultLib*/ true, /*ignoreNoDefaultLib*/ false);
                 }
                 else {
                     ts.forEach(options.lib, function (libFileName) {
-                        processRootFile(ts.combinePaths(defaultLibraryPath, libFileName), /*isDefaultLib*/ true);
+                        processRootFile(ts.combinePaths(defaultLibraryPath, libFileName), /*isDefaultLib*/ true, /*ignoreNoDefaultLib*/ false);
                     });
                 }
             }
             missingFilePaths = ts.arrayFrom(filesByName.keys(), function (p) { return p; }).filter(function (p) { return !filesByName.get(p); });
+            files = ts.stableSort(processingDefaultLibFiles, compareDefaultLibFiles).concat(processingOtherFiles);
+            processingDefaultLibFiles = undefined;
+            processingOtherFiles = undefined;
         }
         ts.Debug.assert(!!missingFilePaths);
         // Release any files we have acquired in the old program but are
@@ -78724,6 +81162,7 @@ var ts;
             isSourceFileDefaultLibrary: isSourceFileDefaultLibrary,
             dropDiagnosticsProducingTypeChecker: dropDiagnosticsProducingTypeChecker,
             getSourceFileFromReference: getSourceFileFromReference,
+            getLibFileFromReference: getLibFileFromReference,
             sourceFileToPackageName: sourceFileToPackageName,
             redirectTargetsSet: redirectTargetsSet,
             isEmittedFile: isEmittedFile,
@@ -78735,6 +81174,21 @@ var ts;
         ts.performance.mark("afterProgram");
         ts.performance.measure("Program", "beforeProgram", "afterProgram");
         return program;
+        function compareDefaultLibFiles(a, b) {
+            return ts.compareValues(getDefaultLibFilePriority(a), getDefaultLibFilePriority(b));
+        }
+        function getDefaultLibFilePriority(a) {
+            if (ts.containsPath(defaultLibraryPath, a.fileName, /*ignoreCase*/ false)) {
+                var basename = ts.getBaseFileName(a.fileName);
+                if (basename === "lib.d.ts" || basename === "lib.es6.d.ts")
+                    return 0;
+                var name = ts.removeSuffix(ts.removePrefix(basename, "lib."), ".d.ts");
+                var index = ts.libs.indexOf(name);
+                if (index !== -1)
+                    return index + 1;
+            }
+            return ts.libs.length + 2;
+        }
         function getResolvedModuleWithFailedLookupLocationsFromCache(moduleName, containingFile) {
             return moduleResolutionCache && ts.resolveModuleNameFromCache(moduleName, containingFile, moduleResolutionCache);
         }
@@ -78793,13 +81247,13 @@ var ts;
                 // which per above occurred during the current program creation.
                 // Since we assume the filesystem does not change during program creation,
                 // it is safe to reuse resolutions from the earlier call.
-                var result_4 = [];
+                var result_3 = [];
                 for (var _i = 0, moduleNames_1 = moduleNames; _i < moduleNames_1.length; _i++) {
                     var moduleName = moduleNames_1[_i];
                     var resolvedModule = file.resolvedModules.get(moduleName);
-                    result_4.push(resolvedModule);
+                    result_3.push(resolvedModule);
                 }
-                return result_4;
+                return result_3;
             }
             // At this point, we know at least one of the following hold:
             // - file has local declarations for ambient modules
@@ -78979,7 +81433,7 @@ var ts;
             for (var _i = 0, oldSourceFiles_2 = oldSourceFiles; _i < oldSourceFiles_2.length; _i++) {
                 var oldSourceFile = oldSourceFiles_2[_i];
                 var newSourceFile = host.getSourceFileByPath
-                    ? host.getSourceFileByPath(oldSourceFile.fileName, oldSourceFile.path, options.target, /*onError*/ undefined, shouldCreateNewSourceFile)
+                    ? host.getSourceFileByPath(oldSourceFile.fileName, oldSourceFile.resolvedPath || oldSourceFile.path, options.target, /*onError*/ undefined, shouldCreateNewSourceFile)
                     : host.getSourceFile(oldSourceFile.fileName, options.target, /*onError*/ undefined, shouldCreateNewSourceFile); // TODO: GH#18217
                 if (!newSourceFile) {
                     return oldProgram.structureIsReused = 0 /* Not */;
@@ -79021,6 +81475,10 @@ var ts;
                 }
                 if (fileChanged) {
                     // The `newSourceFile` object was created for the new program.
+                    if (!ts.arrayIsEqualTo(oldSourceFile.libReferenceDirectives, newSourceFile.libReferenceDirectives, fileReferenceIsEqualTo)) {
+                        // 'lib' references has changed. Matches behavior in changesAffectModuleResolution
+                        return oldProgram.structureIsReused = 0 /* Not */;
+                    }
                     if (oldSourceFile.hasNoDefaultLib !== newSourceFile.hasNoDefaultLib) {
                         // value of no-default-lib has changed
                         // this will affect if default library is injected into the list of files
@@ -79124,20 +81582,8 @@ var ts;
             return oldProgram.structureIsReused = 2 /* Completely */;
         }
         function getEmitHost(writeFileCallback) {
-            return {
-                getPrependNodes: getPrependNodes,
-                getCanonicalFileName: getCanonicalFileName,
-                getCommonSourceDirectory: program.getCommonSourceDirectory,
-                getCompilerOptions: program.getCompilerOptions,
-                getCurrentDirectory: function () { return currentDirectory; },
-                getNewLine: function () { return host.getNewLine(); },
-                getSourceFile: program.getSourceFile,
-                getSourceFileByPath: program.getSourceFileByPath,
-                getSourceFiles: program.getSourceFiles,
-                isSourceFileFromExternalLibrary: isSourceFileFromExternalLibrary,
-                writeFile: writeFileCallback || (function (fileName, data, writeByteOrderMark, onError, sourceFiles) { return host.writeFile(fileName, data, writeByteOrderMark, onError, sourceFiles); }),
-                isEmitBlocked: isEmitBlocked,
-            };
+            return __assign({ getPrependNodes: getPrependNodes,
+                getCanonicalFileName: getCanonicalFileName, getCommonSourceDirectory: program.getCommonSourceDirectory, getCompilerOptions: program.getCompilerOptions, getCurrentDirectory: function () { return currentDirectory; }, getNewLine: function () { return host.getNewLine(); }, getSourceFile: program.getSourceFile, getSourceFileByPath: program.getSourceFileByPath, getSourceFiles: program.getSourceFiles, isSourceFileFromExternalLibrary: isSourceFileFromExternalLibrary, writeFile: writeFileCallback || (function (fileName, data, writeByteOrderMark, onError, sourceFiles) { return host.writeFile(fileName, data, writeByteOrderMark, onError, sourceFiles); }), isEmitBlocked: isEmitBlocked, readFile: function (f) { return host.readFile(f); }, fileExists: function (f) { return host.fileExists(f); } }, (host.directoryExists ? { directoryExists: function (f) { return host.directoryExists(f); } } : {}));
         }
         function getProjectReferences() {
             if (!resolvedProjectReferences)
@@ -79158,8 +81604,10 @@ var ts;
                         continue;
                     var dtsFilename = ts.changeExtension(resolvedRefOpts.options.outFile, ".d.ts");
                     var js = host.readFile(resolvedRefOpts.options.outFile) || "/* Input file " + resolvedRefOpts.options.outFile + " was missing */\r\n";
+                    var jsMap = host.readFile(resolvedRefOpts.options.outFile + ".map"); // TODO: try to read sourceMappingUrl comment from the js file
                     var dts = host.readFile(dtsFilename) || "/* Input file " + dtsFilename + " was missing */\r\n";
-                    var node = ts.createInputFiles(js, dts);
+                    var dtsMap = host.readFile(dtsFilename + ".map");
+                    var node = ts.createInputFiles(js, dts, jsMap, dtsMap);
                     nodes.push(node);
                 }
             }
@@ -79503,8 +81951,8 @@ var ts;
                             }
                             break;
                     }
-                    for (var _b = 0, nodes_6 = nodes; _b < nodes_6.length; _b++) {
-                        var node = nodes_6[_b];
+                    for (var _b = 0, nodes_5 = nodes; _b < nodes_5.length; _b++) {
+                        var node = nodes_5[_b];
                         walk(node);
                     }
                 }
@@ -79585,8 +82033,8 @@ var ts;
         function getConfigFileParsingDiagnostics() {
             return configFileParsingDiagnostics || ts.emptyArray;
         }
-        function processRootFile(fileName, isDefaultLib) {
-            processSourceFile(ts.normalizePath(fileName), isDefaultLib, /*packageId*/ undefined);
+        function processRootFile(fileName, isDefaultLib, ignoreNoDefaultLib) {
+            processSourceFile(ts.normalizePath(fileName), isDefaultLib, ignoreNoDefaultLib, /*packageId*/ undefined);
         }
         function fileReferenceIsEqualTo(a, b) {
             return a.fileName === b.fileName;
@@ -79686,17 +82134,22 @@ var ts;
                 else if (ts.isLiteralImportTypeNode(node)) {
                     imports = ts.append(imports, node.argument.literal);
                 }
-                else {
-                    collectDynamicImportOrRequireCallsForEachChild(node);
-                    if (ts.hasJSDocNodes(node)) {
-                        ts.forEach(node.jsDoc, collectDynamicImportOrRequireCallsForEachChild);
-                    }
+                collectDynamicImportOrRequireCallsForEachChild(node);
+                if (ts.hasJSDocNodes(node)) {
+                    ts.forEach(node.jsDoc, collectDynamicImportOrRequireCallsForEachChild);
                 }
             }
             function collectDynamicImportOrRequireCallsForEachChild(node) {
                 ts.forEachChild(node, collectDynamicImportOrRequireCalls);
             }
         }
+        function getLibFileFromReference(ref) {
+            var libName = ref.fileName.toLocaleLowerCase();
+            var libFileName = ts.libMap.get(libName);
+            if (libFileName) {
+                return getSourceFile(ts.combinePaths(defaultLibraryPath, libFileName));
+            }
+        }
         /** This should have similar behavior to 'processSourceFile' without diagnostics or mutation. */
         function getSourceFileFromReference(referencingFile, ref) {
             return getSourceFileFromReferenceWorker(resolveTripleslashReference(ref.fileName, referencingFile.fileName), function (fileName) { return filesByName.get(toPath(fileName)); });
@@ -79740,8 +82193,8 @@ var ts;
             }
         }
         /** This has side effects through `findSourceFile`. */
-        function processSourceFile(fileName, isDefaultLib, packageId, refFile, refPos, refEnd) {
-            getSourceFileFromReferenceWorker(fileName, function (fileName) { return findSourceFile(fileName, toPath(fileName), isDefaultLib, refFile, refPos, refEnd, packageId); }, // TODO: GH#18217
+        function processSourceFile(fileName, isDefaultLib, ignoreNoDefaultLib, packageId, refFile, refPos, refEnd) {
+            getSourceFileFromReferenceWorker(fileName, function (fileName) { return findSourceFile(fileName, toPath(fileName), isDefaultLib, ignoreNoDefaultLib, refFile, refPos, refEnd, packageId); }, // TODO: GH#18217
             function (diagnostic) {
                 var args = [];
                 for (var _i = 1; _i < arguments.length; _i++) {
@@ -79777,33 +82230,34 @@ var ts;
             return redirect;
         }
         // Get source file from normalized fileName
-        function findSourceFile(fileName, path, isDefaultLib, refFile, refPos, refEnd, packageId) {
+        function findSourceFile(fileName, path, isDefaultLib, ignoreNoDefaultLib, refFile, refPos, refEnd, packageId) {
             if (filesByName.has(path)) {
-                var file_10 = filesByName.get(path);
+                var file_1 = filesByName.get(path);
                 // try to check if we've already seen this file but with a different casing in path
                 // NOTE: this only makes sense for case-insensitive file systems
-                if (file_10 && options.forceConsistentCasingInFileNames && ts.getNormalizedAbsolutePath(file_10.fileName, currentDirectory) !== ts.getNormalizedAbsolutePath(fileName, currentDirectory)) {
-                    reportFileNamesDifferOnlyInCasingError(fileName, file_10.fileName, refFile, refPos, refEnd);
+                if (file_1 && options.forceConsistentCasingInFileNames && ts.getNormalizedAbsolutePath(file_1.fileName, currentDirectory) !== ts.getNormalizedAbsolutePath(fileName, currentDirectory)) {
+                    reportFileNamesDifferOnlyInCasingError(fileName, file_1.fileName, refFile, refPos, refEnd);
                 }
                 // If the file was previously found via a node_modules search, but is now being processed as a root file,
                 // then everything it sucks in may also be marked incorrectly, and needs to be checked again.
-                if (file_10 && sourceFilesFoundSearchingNodeModules.get(file_10.path) && currentNodeModulesDepth === 0) {
-                    sourceFilesFoundSearchingNodeModules.set(file_10.path, false);
+                if (file_1 && sourceFilesFoundSearchingNodeModules.get(file_1.path) && currentNodeModulesDepth === 0) {
+                    sourceFilesFoundSearchingNodeModules.set(file_1.path, false);
                     if (!options.noResolve) {
-                        processReferencedFiles(file_10, isDefaultLib);
-                        processTypeReferenceDirectives(file_10);
+                        processReferencedFiles(file_1, isDefaultLib);
+                        processTypeReferenceDirectives(file_1);
                     }
-                    modulesWithElidedImports.set(file_10.path, false);
-                    processImportedModules(file_10);
+                    processLibReferenceDirectives(file_1);
+                    modulesWithElidedImports.set(file_1.path, false);
+                    processImportedModules(file_1);
                 }
                 // See if we need to reprocess the imports due to prior skipped imports
-                else if (file_10 && modulesWithElidedImports.get(file_10.path)) {
+                else if (file_1 && modulesWithElidedImports.get(file_1.path)) {
                     if (currentNodeModulesDepth < maxNodeModuleJsDepth) {
-                        modulesWithElidedImports.set(file_10.path, false);
-                        processImportedModules(file_10);
+                        modulesWithElidedImports.set(file_1.path, false);
+                        processImportedModules(file_1);
                     }
                 }
-                return file_10;
+                return file_1;
             }
             var redirectedPath;
             if (refFile) {
@@ -79838,7 +82292,7 @@ var ts;
                     redirectTargetsSet.set(fileFromPackageId.path, true);
                     filesByName.set(path, dupFile);
                     sourceFileToPackageName.set(path, packageId.name);
-                    files.push(dupFile);
+                    processingOtherFiles.push(dupFile);
                     return dupFile;
                 }
                 else if (file) {
@@ -79854,6 +82308,7 @@ var ts;
             if (file) {
                 sourceFilesFoundSearchingNodeModules.set(path, currentNodeModulesDepth > 0);
                 file.path = path;
+                file.resolvedPath = toPath(fileName);
                 if (host.useCaseSensitiveFileNames()) {
                     var pathLowerCase = path.toLowerCase();
                     // for case-sensitive file systems check if we've already seen some file with similar filename ignoring case
@@ -79865,18 +82320,19 @@ var ts;
                         filesByNameIgnoreCase.set(pathLowerCase, file);
                     }
                 }
-                skipDefaultLib = skipDefaultLib || file.hasNoDefaultLib;
+                skipDefaultLib = skipDefaultLib || (file.hasNoDefaultLib && !ignoreNoDefaultLib);
                 if (!options.noResolve) {
                     processReferencedFiles(file, isDefaultLib);
                     processTypeReferenceDirectives(file);
                 }
+                processLibReferenceDirectives(file);
                 // always process imported modules to record module name resolutions
                 processImportedModules(file);
                 if (isDefaultLib) {
-                    files.unshift(file);
+                    processingDefaultLibFiles.push(file);
                 }
                 else {
-                    files.push(file);
+                    processingOtherFiles.push(file);
                 }
             }
             return file;
@@ -79900,7 +82356,7 @@ var ts;
         function processReferencedFiles(file, isDefaultLib) {
             ts.forEach(file.referencedFiles, function (ref) {
                 var referencedFileName = resolveTripleslashReference(ref.fileName, file.fileName);
-                processSourceFile(referencedFileName, isDefaultLib, /*packageId*/ undefined, file, ref.pos, ref.end);
+                processSourceFile(referencedFileName, isDefaultLib, /*ignoreNoDefaultLib*/ false, /*packageId*/ undefined, file, ref.pos, ref.end);
             });
         }
         function processTypeReferenceDirectives(file) {
@@ -79929,7 +82385,7 @@ var ts;
             if (resolvedTypeReferenceDirective) {
                 if (resolvedTypeReferenceDirective.primary) {
                     // resolved from the primary path
-                    processSourceFile(resolvedTypeReferenceDirective.resolvedFileName, /*isDefaultLib*/ false, resolvedTypeReferenceDirective.packageId, refFile, refPos, refEnd); // TODO: GH#18217
+                    processSourceFile(resolvedTypeReferenceDirective.resolvedFileName, /*isDefaultLib*/ false, /*ignoreNoDefaultLib*/ false, resolvedTypeReferenceDirective.packageId, refFile, refPos, refEnd); // TODO: GH#18217
                 }
                 else {
                     // If we already resolved to this file, it must have been a secondary reference. Check file contents
@@ -79948,7 +82404,7 @@ var ts;
                     }
                     else {
                         // First resolution of this library
-                        processSourceFile(resolvedTypeReferenceDirective.resolvedFileName, /*isDefaultLib*/ false, resolvedTypeReferenceDirective.packageId, refFile, refPos, refEnd);
+                        processSourceFile(resolvedTypeReferenceDirective.resolvedFileName, /*isDefaultLib*/ false, /*ignoreNoDefaultLib*/ false, resolvedTypeReferenceDirective.packageId, refFile, refPos, refEnd);
                     }
                 }
             }
@@ -79959,6 +82415,22 @@ var ts;
                 resolvedTypeReferenceDirectives.set(typeReferenceDirective, resolvedTypeReferenceDirective);
             }
         }
+        function processLibReferenceDirectives(file) {
+            ts.forEach(file.libReferenceDirectives, function (libReference) {
+                var libName = libReference.fileName.toLocaleLowerCase();
+                var libFileName = ts.libMap.get(libName);
+                if (libFileName) {
+                    // we ignore any 'no-default-lib' reference set on this file.
+                    processRootFile(ts.combinePaths(defaultLibraryPath, libFileName), /*isDefaultLib*/ true, /*ignoreNoDefaultLib*/ true);
+                }
+                else {
+                    var unqualifiedLibName = ts.removeSuffix(ts.removePrefix(libName, "lib."), ".d.ts");
+                    var suggestion = ts.getSpellingSuggestion(unqualifiedLibName, ts.libs, ts.identity);
+                    var message = suggestion ? ts.Diagnostics.Cannot_find_lib_definition_for_0_Did_you_mean_1 : ts.Diagnostics.Cannot_find_lib_definition_for_0;
+                    fileProcessingDiagnostics.add(createDiagnostic(file, libReference.pos, libReference.end, message, libName, suggestion));
+                }
+            });
+        }
         function createDiagnostic(refFile, refPos, refEnd, message) {
             var args = [];
             for (var _i = 4; _i < arguments.length; _i++) {
@@ -80016,7 +82488,7 @@ var ts;
                     else if (shouldAddFile) {
                         var path = toPath(resolvedFileName);
                         var pos = ts.skipTrivia(file.text, file.imports[i].pos);
-                        findSourceFile(resolvedFileName, path, /*isDefaultLib*/ false, file, pos, file.imports[i].end, resolution.packageId);
+                        findSourceFile(resolvedFileName, path, /*isDefaultLib*/ false, /*ignoreNoDefaultLib*/ false, file, pos, file.imports[i].end, resolution.packageId);
                     }
                     if (isFromNodeModulesSearch) {
                         currentNodeModulesDepth--;
@@ -80031,9 +82503,9 @@ var ts;
         function computeCommonSourceDirectory(sourceFiles) {
             var fileNames = [];
             for (var _i = 0, sourceFiles_2 = sourceFiles; _i < sourceFiles_2.length; _i++) {
-                var file_11 = sourceFiles_2[_i];
-                if (!file_11.isDeclarationFile) {
-                    fileNames.push(file_11.fileName);
+                var file = sourceFiles_2[_i];
+                if (!file.isDeclarationFile) {
+                    fileNames.push(file.fileName);
                 }
             }
             return computeCommonSourceDirectoryOfFilenames(fileNames, currentDirectory, getCanonicalFileName);
@@ -80137,14 +82609,14 @@ var ts;
             if (options.composite && rootNames.length < files.length) {
                 var normalizedRootNames = rootNames.map(function (r) { return ts.normalizePath(r).toLowerCase(); });
                 var sourceFiles = files.filter(function (f) { return !f.isDeclarationFile; }).map(function (f) { return ts.normalizePath(f.path).toLowerCase(); });
-                var _loop_10 = function (file_12) {
-                    if (normalizedRootNames.every(function (r) { return r !== file_12; })) {
-                        programDiagnostics.add(ts.createCompilerDiagnostic(ts.Diagnostics.File_0_is_not_in_project_file_list_Projects_must_list_all_files_or_use_an_include_pattern, file_12));
+                var _loop_8 = function (file) {
+                    if (normalizedRootNames.every(function (r) { return r !== file; })) {
+                        programDiagnostics.add(ts.createCompilerDiagnostic(ts.Diagnostics.File_0_is_not_in_project_file_list_Projects_must_list_all_files_or_use_an_include_pattern, file));
                     }
                 };
                 for (var _i = 0, sourceFiles_4 = sourceFiles; _i < sourceFiles_4.length; _i++) {
-                    var file_12 = sourceFiles_4[_i];
-                    _loop_10(file_12);
+                    var file = sourceFiles_4[_i];
+                    _loop_8(file);
                 }
             }
             if (options.paths) {
@@ -80496,6 +82968,7 @@ var ts;
         }
         return ref.path;
     }
+    ts.resolveProjectReferencePath = resolveProjectReferencePath;
     /* @internal */
     /**
      * Returns a DiagnosticMessage if we won't include a resolved module due to its extension.
@@ -81446,8 +83919,29 @@ var ts;
         function isNodeModulesAtTypesDirectory(dirPath) {
             return ts.endsWith(dirPath, "/node_modules/@types");
         }
-        function isDirectoryAtleastAtLevelFromFSRoot(dirPath, minLevels) {
-            for (var searchIndex = ts.getRootLength(dirPath); minLevels > 0; minLevels--) {
+        /**
+         * Filter out paths like
+         * "/", "/user", "/user/username", "/user/username/folderAtRoot",
+         * "c:/", "c:/users", "c:/users/username", "c:/users/username/folderAtRoot", "c:/folderAtRoot"
+         * @param dirPath
+         */
+        function canWatchDirectory(dirPath) {
+            var rootLength = ts.getRootLength(dirPath);
+            if (dirPath.length === rootLength) {
+                // Ignore "/", "c:/"
+                return false;
+            }
+            var nextDirectorySeparator = dirPath.indexOf(ts.directorySeparator, rootLength);
+            if (nextDirectorySeparator === -1) {
+                // ignore "/user", "c:/users" or "c:/folderAtRoot"
+                return false;
+            }
+            if (dirPath.charCodeAt(0) !== 47 /* slash */ &&
+                dirPath.substr(rootLength, nextDirectorySeparator).search(/users/i) === -1) {
+                // Paths like c:/folderAtRoot/subFolder are allowed
+                return true;
+            }
+            for (var searchIndex = nextDirectorySeparator + 1, searchLevels = 2; searchLevels > 0; searchLevels--) {
                 searchIndex = dirPath.indexOf(ts.directorySeparator, searchIndex) + 1;
                 if (searchIndex === 0) {
                     // Folder isnt at expected minimun levels
@@ -81456,14 +83950,6 @@ var ts;
             }
             return true;
         }
-        function canWatchDirectory(dirPath) {
-            return isDirectoryAtleastAtLevelFromFSRoot(dirPath, 
-            // When root is "/" do not watch directories like:
-            // "/", "/user", "/user/username", "/user/username/folderAtRoot"
-            // When root is "c:/" do not watch directories like:
-            // "c:/", "c:/folderAtRoot"
-            dirPath.charCodeAt(0) === 47 /* slash */ ? 3 : 1);
-        }
         function filterFSRootDirectoriesToWatch(watchPath, dirPath) {
             if (!canWatchDirectory(dirPath)) {
                 watchPath.ignore = true;
@@ -81773,6 +84259,315 @@ var ts;
     }
     ts.createResolutionCache = createResolutionCache;
 })(ts || (ts = {}));
+// Used by importFixes to synthesize import module specifiers.
+/* @internal */
+var ts;
+(function (ts) {
+    var moduleSpecifiers;
+    (function (moduleSpecifiers) {
+        // Note: fromSourceFile is just for usesJsExtensionOnImports
+        function getModuleSpecifier(compilerOptions, fromSourceFile, fromSourceFileName, toFileName, host, preferences) {
+            if (preferences === void 0) { preferences = {}; }
+            var info = getInfo(compilerOptions, fromSourceFile, fromSourceFileName, host);
+            return getGlobalModuleSpecifier(toFileName, info, host, compilerOptions) ||
+                ts.first(getLocalModuleSpecifiers(toFileName, info, compilerOptions, preferences));
+        }
+        moduleSpecifiers.getModuleSpecifier = getModuleSpecifier;
+        // For each symlink/original for a module, returns a list of ways to import that file.
+        function getModuleSpecifiers(moduleSymbol, program, importingSourceFile, host, preferences) {
+            var ambient = tryGetModuleNameFromAmbientModule(moduleSymbol);
+            if (ambient)
+                return [[ambient]];
+            var compilerOptions = program.getCompilerOptions();
+            var info = getInfo(compilerOptions, importingSourceFile, importingSourceFile.fileName, host);
+            var modulePaths = getAllModulePaths(program, ts.getSourceFileOfNode(moduleSymbol.valueDeclaration));
+            var global = ts.mapDefined(modulePaths, function (moduleFileName) { return getGlobalModuleSpecifier(moduleFileName, info, host, compilerOptions); });
+            return global.length ? global.map(function (g) { return [g]; }) : modulePaths.map(function (moduleFileName) {
+                return getLocalModuleSpecifiers(moduleFileName, info, compilerOptions, preferences);
+            });
+        }
+        moduleSpecifiers.getModuleSpecifiers = getModuleSpecifiers;
+        // importingSourceFileName is separate because getEditsForFileRename may need to specify an updated path
+        function getInfo(compilerOptions, importingSourceFile, importingSourceFileName, host) {
+            var moduleResolutionKind = ts.getEmitModuleResolutionKind(compilerOptions);
+            var addJsExtension = usesJsExtensionOnImports(importingSourceFile);
+            var getCanonicalFileName = ts.createGetCanonicalFileName(host.useCaseSensitiveFileNames ? host.useCaseSensitiveFileNames() : true);
+            var sourceDirectory = ts.getDirectoryPath(importingSourceFileName);
+            return { moduleResolutionKind: moduleResolutionKind, addJsExtension: addJsExtension, getCanonicalFileName: getCanonicalFileName, sourceDirectory: sourceDirectory };
+        }
+        function getGlobalModuleSpecifier(moduleFileName, _a, host, compilerOptions) {
+            var addJsExtension = _a.addJsExtension, getCanonicalFileName = _a.getCanonicalFileName, sourceDirectory = _a.sourceDirectory;
+            return tryGetModuleNameFromTypeRoots(compilerOptions, host, getCanonicalFileName, moduleFileName, addJsExtension)
+                || tryGetModuleNameAsNodeModule(compilerOptions, moduleFileName, host, getCanonicalFileName, sourceDirectory)
+                || compilerOptions.rootDirs && tryGetModuleNameFromRootDirs(compilerOptions.rootDirs, moduleFileName, sourceDirectory, getCanonicalFileName);
+        }
+        function getLocalModuleSpecifiers(moduleFileName, _a, compilerOptions, preferences) {
+            var moduleResolutionKind = _a.moduleResolutionKind, addJsExtension = _a.addJsExtension, getCanonicalFileName = _a.getCanonicalFileName, sourceDirectory = _a.sourceDirectory;
+            var baseUrl = compilerOptions.baseUrl, paths = compilerOptions.paths;
+            var relativePath = removeExtensionAndIndexPostFix(ts.ensurePathIsNonModuleName(ts.getRelativePathFromDirectory(sourceDirectory, moduleFileName, getCanonicalFileName)), moduleResolutionKind, addJsExtension);
+            if (!baseUrl || preferences.importModuleSpecifierPreference === "relative") {
+                return [relativePath];
+            }
+            var relativeToBaseUrl = getRelativePathIfInDirectory(moduleFileName, baseUrl, getCanonicalFileName);
+            if (!relativeToBaseUrl) {
+                return [relativePath];
+            }
+            var importRelativeToBaseUrl = removeExtensionAndIndexPostFix(relativeToBaseUrl, moduleResolutionKind, addJsExtension);
+            if (paths) {
+                var fromPaths = tryGetModuleNameFromPaths(ts.removeFileExtension(relativeToBaseUrl), importRelativeToBaseUrl, paths);
+                if (fromPaths) {
+                    return [fromPaths];
+                }
+            }
+            if (preferences.importModuleSpecifierPreference === "non-relative") {
+                return [importRelativeToBaseUrl];
+            }
+            if (preferences.importModuleSpecifierPreference !== undefined)
+                ts.Debug.assertNever(preferences.importModuleSpecifierPreference);
+            if (isPathRelativeToParent(relativeToBaseUrl)) {
+                return [relativePath];
+            }
+            /*
+            Prefer a relative import over a baseUrl import if it doesn't traverse up to baseUrl.
+    
+            Suppose we have:
+                baseUrl = /base
+                sourceDirectory = /base/a/b
+                moduleFileName = /base/foo/bar
+            Then:
+                relativePath = ../../foo/bar
+                getRelativePathNParents(relativePath) = 2
+                pathFromSourceToBaseUrl = ../../
+                getRelativePathNParents(pathFromSourceToBaseUrl) = 2
+                2 < 2 = false
+            In this case we should prefer using the baseUrl path "/a/b" instead of the relative path "../../foo/bar".
+    
+            Suppose we have:
+                baseUrl = /base
+                sourceDirectory = /base/foo/a
+                moduleFileName = /base/foo/bar
+            Then:
+                relativePath = ../a
+                getRelativePathNParents(relativePath) = 1
+                pathFromSourceToBaseUrl = ../../
+                getRelativePathNParents(pathFromSourceToBaseUrl) = 2
+                1 < 2 = true
+            In this case we should prefer using the relative path "../a" instead of the baseUrl path "foo/a".
+            */
+            var pathFromSourceToBaseUrl = ts.ensurePathIsNonModuleName(ts.getRelativePathFromDirectory(sourceDirectory, baseUrl, getCanonicalFileName));
+            var relativeFirst = getRelativePathNParents(relativePath) < getRelativePathNParents(pathFromSourceToBaseUrl);
+            return relativeFirst ? [relativePath, importRelativeToBaseUrl] : [importRelativeToBaseUrl, relativePath];
+        }
+        function usesJsExtensionOnImports(_a) {
+            var imports = _a.imports;
+            return ts.firstDefined(imports, function (_a) {
+                var text = _a.text;
+                return ts.pathIsRelative(text) ? ts.fileExtensionIs(text, ".js" /* Js */) : undefined;
+            }) || false;
+        }
+        /**
+         * Looks for a existing imports that use symlinks to this module.
+         * Only if no symlink is available, the real path will be used.
+         */
+        function getAllModulePaths(program, _a) {
+            var fileName = _a.fileName;
+            var symlinks = ts.mapDefined(program.getSourceFiles(), function (sf) {
+                return sf.resolvedModules && ts.firstDefinedIterator(sf.resolvedModules.values(), function (res) {
+                    return res && res.resolvedFileName === fileName ? res.originalPath : undefined;
+                });
+            });
+            return symlinks.length === 0 ? [fileName] : symlinks;
+        }
+        function getRelativePathNParents(relativePath) {
+            var components = ts.getPathComponents(relativePath);
+            if (components[0] || components.length === 1)
+                return 0;
+            for (var i = 1; i < components.length; i++) {
+                if (components[i] !== "..")
+                    return i - 1;
+            }
+            return components.length - 1;
+        }
+        function tryGetModuleNameFromAmbientModule(moduleSymbol) {
+            var decl = moduleSymbol.valueDeclaration;
+            if (ts.isModuleDeclaration(decl) && ts.isStringLiteral(decl.name)) {
+                return decl.name.text;
+            }
+        }
+        function tryGetModuleNameFromPaths(relativeToBaseUrlWithIndex, relativeToBaseUrl, paths) {
+            for (var key in paths) {
+                for (var _i = 0, _a = paths[key]; _i < _a.length; _i++) {
+                    var patternText_1 = _a[_i];
+                    var pattern = ts.removeFileExtension(ts.normalizePath(patternText_1));
+                    var indexOfStar = pattern.indexOf("*");
+                    if (indexOfStar === 0 && pattern.length === 1) {
+                        continue;
+                    }
+                    else if (indexOfStar !== -1) {
+                        var prefix = pattern.substr(0, indexOfStar);
+                        var suffix = pattern.substr(indexOfStar + 1);
+                        if (relativeToBaseUrl.length >= prefix.length + suffix.length &&
+                            ts.startsWith(relativeToBaseUrl, prefix) &&
+                            ts.endsWith(relativeToBaseUrl, suffix)) {
+                            var matchedStar = relativeToBaseUrl.substr(prefix.length, relativeToBaseUrl.length - suffix.length);
+                            return key.replace("*", matchedStar);
+                        }
+                    }
+                    else if (pattern === relativeToBaseUrl || pattern === relativeToBaseUrlWithIndex) {
+                        return key;
+                    }
+                }
+            }
+        }
+        function tryGetModuleNameFromRootDirs(rootDirs, moduleFileName, sourceDirectory, getCanonicalFileName) {
+            var normalizedTargetPath = getPathRelativeToRootDirs(moduleFileName, rootDirs, getCanonicalFileName);
+            if (normalizedTargetPath === undefined) {
+                return undefined;
+            }
+            var normalizedSourcePath = getPathRelativeToRootDirs(sourceDirectory, rootDirs, getCanonicalFileName);
+            var relativePath = normalizedSourcePath !== undefined ? ts.ensurePathIsNonModuleName(ts.getRelativePathFromDirectory(normalizedSourcePath, normalizedTargetPath, getCanonicalFileName)) : normalizedTargetPath;
+            return ts.removeFileExtension(relativePath);
+        }
+        function tryGetModuleNameFromTypeRoots(options, host, getCanonicalFileName, moduleFileName, addJsExtension) {
+            var roots = ts.getEffectiveTypeRoots(options, host);
+            return ts.firstDefined(roots, function (unNormalizedTypeRoot) {
+                var typeRoot = ts.toPath(unNormalizedTypeRoot, /*basePath*/ undefined, getCanonicalFileName);
+                if (ts.startsWith(moduleFileName, typeRoot)) {
+                    // For a type definition, we can strip `/index` even with classic resolution.
+                    return removeExtensionAndIndexPostFix(moduleFileName.substring(typeRoot.length + 1), ts.ModuleResolutionKind.NodeJs, addJsExtension);
+                }
+            });
+        }
+        function tryGetModuleNameAsNodeModule(options, moduleFileName, host, getCanonicalFileName, sourceDirectory) {
+            if (ts.getEmitModuleResolutionKind(options) !== ts.ModuleResolutionKind.NodeJs) {
+                // nothing to do here
+                return undefined;
+            }
+            var parts = getNodeModulePathParts(moduleFileName);
+            if (!parts) {
+                return undefined;
+            }
+            // Simplify the full file path to something that can be resolved by Node.
+            // If the module could be imported by a directory name, use that directory's name
+            var moduleSpecifier = getDirectoryOrExtensionlessFileName(moduleFileName);
+            // Get a path that's relative to node_modules or the importing file's path
+            // if node_modules folder is in this folder or any of its parent folders, no need to keep it.
+            if (!ts.startsWith(sourceDirectory, moduleSpecifier.substring(0, parts.topLevelNodeModulesIndex)))
+                return undefined;
+            // If the module was found in @types, get the actual Node package name
+            return ts.getPackageNameFromAtTypesDirectory(moduleSpecifier.substring(parts.topLevelPackageNameIndex + 1));
+            function getDirectoryOrExtensionlessFileName(path) {
+                // If the file is the main module, it can be imported by the package name
+                var packageRootPath = path.substring(0, parts.packageRootIndex);
+                var packageJsonPath = ts.combinePaths(packageRootPath, "package.json");
+                if (host.fileExists(packageJsonPath)) { // TODO: GH#18217
+                    var packageJsonContent = JSON.parse(host.readFile(packageJsonPath));
+                    if (packageJsonContent) {
+                        var mainFileRelative = packageJsonContent.typings || packageJsonContent.types || packageJsonContent.main;
+                        if (mainFileRelative) {
+                            var mainExportFile = ts.toPath(mainFileRelative, packageRootPath, getCanonicalFileName);
+                            if (ts.removeFileExtension(mainExportFile) === ts.removeFileExtension(getCanonicalFileName(path))) {
+                                return packageRootPath;
+                            }
+                        }
+                    }
+                }
+                // We still have a file name - remove the extension
+                var fullModulePathWithoutExtension = ts.removeFileExtension(path);
+                // If the file is /index, it can be imported by its directory name
+                // IFF there is not _also_ a file by the same name
+                if (getCanonicalFileName(fullModulePathWithoutExtension.substring(parts.fileNameIndex)) === "/index" && !tryGetAnyFileFromPath(host, fullModulePathWithoutExtension.substring(0, parts.fileNameIndex))) {
+                    return fullModulePathWithoutExtension.substring(0, parts.fileNameIndex);
+                }
+                return fullModulePathWithoutExtension;
+            }
+        }
+        function tryGetAnyFileFromPath(host, path) {
+            // We check all js, `node` and `json` extensions in addition to TS, since node module resolution would also choose those over the directory
+            var extensions = ts.getSupportedExtensions({ allowJs: true }, [{ extension: "node", isMixedContent: false }, { extension: "json", isMixedContent: false, scriptKind: 6 /* JSON */ }]);
+            for (var _i = 0, extensions_1 = extensions; _i < extensions_1.length; _i++) {
+                var e = extensions_1[_i];
+                var fullPath = path + e;
+                if (host.fileExists(fullPath)) { // TODO: GH#18217
+                    return fullPath;
+                }
+            }
+        }
+        function getNodeModulePathParts(fullPath) {
+            // If fullPath can't be valid module file within node_modules, returns undefined.
+            // Example of expected pattern: /base/path/node_modules/[@scope/otherpackage/@otherscope/node_modules/]package/[subdirectory/]file.js
+            // Returns indices:                       ^            ^                                                      ^             ^
+            var topLevelNodeModulesIndex = 0;
+            var topLevelPackageNameIndex = 0;
+            var packageRootIndex = 0;
+            var fileNameIndex = 0;
+            var States;
+            (function (States) {
+                States[States["BeforeNodeModules"] = 0] = "BeforeNodeModules";
+                States[States["NodeModules"] = 1] = "NodeModules";
+                States[States["Scope"] = 2] = "Scope";
+                States[States["PackageContent"] = 3] = "PackageContent";
+            })(States || (States = {}));
+            var partStart = 0;
+            var partEnd = 0;
+            var state = 0 /* BeforeNodeModules */;
+            while (partEnd >= 0) {
+                partStart = partEnd;
+                partEnd = fullPath.indexOf("/", partStart + 1);
+                switch (state) {
+                    case 0 /* BeforeNodeModules */:
+                        if (fullPath.indexOf("/node_modules/", partStart) === partStart) {
+                            topLevelNodeModulesIndex = partStart;
+                            topLevelPackageNameIndex = partEnd;
+                            state = 1 /* NodeModules */;
+                        }
+                        break;
+                    case 1 /* NodeModules */:
+                    case 2 /* Scope */:
+                        if (state === 1 /* NodeModules */ && fullPath.charAt(partStart + 1) === "@") {
+                            state = 2 /* Scope */;
+                        }
+                        else {
+                            packageRootIndex = partEnd;
+                            state = 3 /* PackageContent */;
+                        }
+                        break;
+                    case 3 /* PackageContent */:
+                        if (fullPath.indexOf("/node_modules/", partStart) === partStart) {
+                            state = 1 /* NodeModules */;
+                        }
+                        else {
+                            state = 3 /* PackageContent */;
+                        }
+                        break;
+                }
+            }
+            fileNameIndex = partStart;
+            return state > 1 /* NodeModules */ ? { topLevelNodeModulesIndex: topLevelNodeModulesIndex, topLevelPackageNameIndex: topLevelPackageNameIndex, packageRootIndex: packageRootIndex, fileNameIndex: fileNameIndex } : undefined;
+        }
+        function getPathRelativeToRootDirs(path, rootDirs, getCanonicalFileName) {
+            return ts.firstDefined(rootDirs, function (rootDir) {
+                var relativePath = getRelativePathIfInDirectory(path, rootDir, getCanonicalFileName); // TODO: GH#18217
+                return isPathRelativeToParent(relativePath) ? undefined : relativePath;
+            });
+        }
+        function removeExtensionAndIndexPostFix(fileName, moduleResolutionKind, addJsExtension) {
+            var noExtension = ts.removeFileExtension(fileName);
+            return addJsExtension
+                ? noExtension + ".js"
+                : moduleResolutionKind === ts.ModuleResolutionKind.NodeJs
+                    ? ts.removeSuffix(noExtension, "/index")
+                    : noExtension;
+        }
+        function getRelativePathIfInDirectory(path, directoryPath, getCanonicalFileName) {
+            var relativePath = ts.getRelativePathToDirectoryOrUrl(directoryPath, path, directoryPath, getCanonicalFileName, /*isAbsolutePathAnUrl*/ false);
+            return ts.isRootedDiskPath(relativePath) ? undefined : relativePath;
+        }
+        function isPathRelativeToParent(path) {
+            return ts.startsWith(path, "..");
+        }
+    })(moduleSpecifiers = ts.moduleSpecifiers || (ts.moduleSpecifiers = {}));
+})(ts || (ts = {}));
 /*@internal*/
 var ts;
 (function (ts) {
@@ -81942,11 +84737,11 @@ var ts;
             watchFile: system.watchFile ? (function (path, callback, pollingInterval) { return system.watchFile(path, callback, pollingInterval); }) : function () { return noopFileWatcher; },
             watchDirectory: system.watchDirectory ? (function (path, callback, recursive) { return system.watchDirectory(path, callback, recursive); }) : function () { return noopFileWatcher; },
             setTimeout: system.setTimeout ? (function (callback, ms) {
-                var _a;
                 var args = [];
                 for (var _i = 2; _i < arguments.length; _i++) {
                     args[_i - 2] = arguments[_i];
                 }
+                var _a;
                 return (_a = system.setTimeout).call.apply(_a, [system, callback, ms].concat(args));
             }) : ts.noop,
             clearTimeout: system.clearTimeout ? (function (timeoutId) { return system.clearTimeout(timeoutId); }) : ts.noop,
@@ -82472,2139 +85267,1381 @@ var ts;
 })(ts || (ts = {}));
 var ts;
 (function (ts) {
-    /* @internal */
-    ts.compileOnSaveCommandLineOption = { name: "compileOnSave", type: "boolean" };
-    /* @internal */
-    ts.optionDeclarations = [
-        // CommandLine only options
+    var minimumDate = new Date(-8640000000000000);
+    var maximumDate = new Date(8640000000000000);
+    var BuildResultFlags;
+    (function (BuildResultFlags) {
+        BuildResultFlags[BuildResultFlags["None"] = 0] = "None";
+        /**
+         * No errors of any kind occurred during build
+         */
+        BuildResultFlags[BuildResultFlags["Success"] = 1] = "Success";
+        /**
+         * None of the .d.ts files emitted by this build were
+         * different from the existing files on disk
+         */
+        BuildResultFlags[BuildResultFlags["DeclarationOutputUnchanged"] = 2] = "DeclarationOutputUnchanged";
+        BuildResultFlags[BuildResultFlags["ConfigFileErrors"] = 4] = "ConfigFileErrors";
+        BuildResultFlags[BuildResultFlags["SyntaxErrors"] = 8] = "SyntaxErrors";
+        BuildResultFlags[BuildResultFlags["TypeErrors"] = 16] = "TypeErrors";
+        BuildResultFlags[BuildResultFlags["DeclarationEmitErrors"] = 32] = "DeclarationEmitErrors";
+        BuildResultFlags[BuildResultFlags["AnyErrors"] = 60] = "AnyErrors";
+    })(BuildResultFlags || (BuildResultFlags = {}));
+    var UpToDateStatusType;
+    (function (UpToDateStatusType) {
+        UpToDateStatusType[UpToDateStatusType["Unbuildable"] = 0] = "Unbuildable";
+        UpToDateStatusType[UpToDateStatusType["UpToDate"] = 1] = "UpToDate";
+        /**
+         * The project appears out of date because its upstream inputs are newer than its outputs,
+         * but all of its outputs are actually newer than the previous identical outputs of its (.d.ts) inputs.
+         * This means we can Pseudo-build (just touch timestamps), as if we had actually built this project.
+         */
+        UpToDateStatusType[UpToDateStatusType["UpToDateWithUpstreamTypes"] = 2] = "UpToDateWithUpstreamTypes";
+        UpToDateStatusType[UpToDateStatusType["OutputMissing"] = 3] = "OutputMissing";
+        UpToDateStatusType[UpToDateStatusType["OutOfDateWithSelf"] = 4] = "OutOfDateWithSelf";
+        UpToDateStatusType[UpToDateStatusType["OutOfDateWithUpstream"] = 5] = "OutOfDateWithUpstream";
+        UpToDateStatusType[UpToDateStatusType["UpstreamOutOfDate"] = 6] = "UpstreamOutOfDate";
+        UpToDateStatusType[UpToDateStatusType["UpstreamBlocked"] = 7] = "UpstreamBlocked";
+        /**
+         * Projects with no outputs (i.e. "solution" files)
+         */
+        UpToDateStatusType[UpToDateStatusType["ContainerOnly"] = 8] = "ContainerOnly";
+    })(UpToDateStatusType = ts.UpToDateStatusType || (ts.UpToDateStatusType = {}));
+    /**
+     * A FileMap maintains a normalized-key to value relationship
+     */
+    function createFileMap() {
+        // tslint:disable-next-line:no-null-keyword
+        var lookup = ts.createMap();
+        return {
+            setValue: setValue,
+            getValue: getValue,
+            getValueOrUndefined: getValueOrUndefined,
+            removeKey: removeKey,
+            getKeys: getKeys,
+            hasKey: hasKey
+        };
+        function getKeys() {
+            return Object.keys(lookup);
+        }
+        function hasKey(fileName) {
+            return lookup.has(ts.normalizePath(fileName));
+        }
+        function removeKey(fileName) {
+            lookup.delete(ts.normalizePath(fileName));
+        }
+        function setValue(fileName, value) {
+            lookup.set(ts.normalizePath(fileName), value);
+        }
+        function getValue(fileName) {
+            var f = ts.normalizePath(fileName);
+            if (lookup.has(f)) {
+                return lookup.get(f);
+            }
+            else {
+                throw new Error("No value corresponding to " + fileName + " exists in this map");
+            }
+        }
+        function getValueOrUndefined(fileName) {
+            var f = ts.normalizePath(fileName);
+            return lookup.get(f);
+        }
+    }
+    function createDependencyMapper() {
+        var childToParents = createFileMap();
+        var parentToChildren = createFileMap();
+        var allKeys = createFileMap();
+        function addReference(childConfigFileName, parentConfigFileName) {
+            addEntry(childToParents, childConfigFileName, parentConfigFileName);
+            addEntry(parentToChildren, parentConfigFileName, childConfigFileName);
+        }
+        function getReferencesTo(parentConfigFileName) {
+            return parentToChildren.getValueOrUndefined(parentConfigFileName) || [];
+        }
+        function getReferencesOf(childConfigFileName) {
+            return childToParents.getValueOrUndefined(childConfigFileName) || [];
+        }
+        function getKeys() {
+            return allKeys.getKeys();
+        }
+        function addEntry(mapToAddTo, key, element) {
+            key = ts.normalizePath(key);
+            element = ts.normalizePath(element);
+            var arr = mapToAddTo.getValueOrUndefined(key);
+            if (arr === undefined) {
+                mapToAddTo.setValue(key, arr = []);
+            }
+            if (arr.indexOf(element) < 0) {
+                arr.push(element);
+            }
+            allKeys.setValue(key, true);
+            allKeys.setValue(element, true);
+        }
+        return {
+            addReference: addReference,
+            getReferencesTo: getReferencesTo,
+            getReferencesOf: getReferencesOf,
+            getKeys: getKeys
+        };
+    }
+    ts.createDependencyMapper = createDependencyMapper;
+    function getOutputDeclarationFileName(inputFileName, configFile) {
+        var relativePath = ts.getRelativePathFromDirectory(rootDirOfOptions(configFile.options, configFile.options.configFilePath), inputFileName, /*ignoreCase*/ true);
+        var outputPath = ts.resolvePath(configFile.options.declarationDir || configFile.options.outDir || ts.getDirectoryPath(configFile.options.configFilePath), relativePath);
+        return ts.changeExtension(outputPath, ".d.ts" /* Dts */);
+    }
+    function getOutputJavaScriptFileName(inputFileName, configFile) {
+        var relativePath = ts.getRelativePathFromDirectory(rootDirOfOptions(configFile.options, configFile.options.configFilePath), inputFileName, /*ignoreCase*/ true);
+        var outputPath = ts.resolvePath(configFile.options.outDir || ts.getDirectoryPath(configFile.options.configFilePath), relativePath);
+        return ts.changeExtension(outputPath, (ts.fileExtensionIs(inputFileName, ".tsx" /* Tsx */) && configFile.options.jsx === 1 /* Preserve */) ? ".jsx" /* Jsx */ : ".js" /* Js */);
+    }
+    function getOutputFileNames(inputFileName, configFile) {
+        if (configFile.options.outFile) {
+            return ts.emptyArray;
+        }
+        var outputs = [];
+        outputs.push(getOutputJavaScriptFileName(inputFileName, configFile));
+        if (configFile.options.declaration) {
+            var dts = outputs.push(getOutputDeclarationFileName(inputFileName, configFile));
+            if (configFile.options.declarationMap) {
+                outputs.push(dts + ".map");
+            }
+        }
+        return outputs;
+    }
+    function getOutFileOutputs(project) {
+        if (!project.options.outFile) {
+            return ts.Debug.fail("outFile must be set");
+        }
+        var outputs = [];
+        outputs.push(project.options.outFile);
+        if (project.options.declaration) {
+            var dts = ts.changeExtension(project.options.outFile, ".d.ts" /* Dts */);
+            outputs.push(dts);
+            if (project.options.declarationMap) {
+                outputs.push(dts + ".map");
+            }
+        }
+        return outputs;
+    }
+    function rootDirOfOptions(opts, configFileName) {
+        return opts.rootDir || ts.getDirectoryPath(configFileName);
+    }
+    function createConfigFileCache(host) {
+        var cache = createFileMap();
+        var configParseHost = ts.parseConfigHostFromCompilerHost(host);
+        function parseConfigFile(configFilePath) {
+            var sourceFile = host.getSourceFile(configFilePath, 100 /* JSON */);
+            if (sourceFile === undefined) {
+                return undefined;
+            }
+            var parsed = ts.parseJsonSourceFileConfigFileContent(sourceFile, configParseHost, ts.getDirectoryPath(configFilePath));
+            parsed.options.configFilePath = configFilePath;
+            cache.setValue(configFilePath, parsed);
+            return parsed;
+        }
+        function removeKey(configFilePath) {
+            cache.removeKey(configFilePath);
+        }
+        return {
+            parseConfigFile: parseConfigFile,
+            removeKey: removeKey
+        };
+    }
+    function newer(date1, date2) {
+        return date2 > date1 ? date2 : date1;
+    }
+    function isDeclarationFile(fileName) {
+        return ts.fileExtensionIs(fileName, ".d.ts" /* Dts */);
+    }
+    function createBuildContext(options) {
+        var invalidatedProjects = createFileMap();
+        var queuedProjects = createFileMap();
+        var missingRoots = ts.createMap();
+        return {
+            options: options,
+            projectStatus: createFileMap(),
+            unchangedOutputs: createFileMap(),
+            invalidatedProjects: invalidatedProjects,
+            missingRoots: missingRoots,
+            queuedProjects: queuedProjects
+        };
+    }
+    ts.createBuildContext = createBuildContext;
+    var buildOpts = [
         {
-            name: "help",
-            shortName: "h",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
+            name: "verbose",
+            shortName: "v",
             category: ts.Diagnostics.Command_line_Options,
-            description: ts.Diagnostics.Print_this_message,
-        },
-        {
-            name: "help",
-            shortName: "?",
+            description: ts.Diagnostics.Enable_verbose_logging,
             type: "boolean"
         },
         {
-            name: "all",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
+            name: "dry",
+            shortName: "d",
             category: ts.Diagnostics.Command_line_Options,
-            description: ts.Diagnostics.Show_all_compiler_options,
+            description: ts.Diagnostics.Show_what_would_be_built_or_deleted_if_specified_with_clean,
+            type: "boolean"
         },
         {
-            name: "version",
-            shortName: "v",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
+            name: "force",
+            shortName: "f",
             category: ts.Diagnostics.Command_line_Options,
-            description: ts.Diagnostics.Print_the_compiler_s_version,
+            description: ts.Diagnostics.Build_all_projects_including_those_that_appear_to_be_up_to_date,
+            type: "boolean"
         },
         {
-            name: "init",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
+            name: "clean",
             category: ts.Diagnostics.Command_line_Options,
-            description: ts.Diagnostics.Initializes_a_TypeScript_project_and_creates_a_tsconfig_json_file,
-        },
-        {
-            name: "project",
-            shortName: "p",
-            type: "string",
-            isFilePath: true,
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Command_line_Options,
-            paramType: ts.Diagnostics.FILE_OR_DIRECTORY,
-            description: ts.Diagnostics.Compile_the_project_given_the_path_to_its_configuration_file_or_to_a_folder_with_a_tsconfig_json,
-        },
-        {
-            name: "pretty",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Command_line_Options,
-            description: ts.Diagnostics.Stylize_errors_and_messages_using_color_and_context_experimental
-        },
-        {
-            name: "preserveWatchOutput",
-            type: "boolean",
-            showInSimplifiedHelpView: false,
-            category: ts.Diagnostics.Command_line_Options,
-            description: ts.Diagnostics.Whether_to_keep_outdated_console_output_in_watch_mode_instead_of_clearing_the_screen,
+            description: ts.Diagnostics.Delete_the_outputs_of_all_projects,
+            type: "boolean"
         },
         {
             name: "watch",
-            shortName: "w",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
             category: ts.Diagnostics.Command_line_Options,
             description: ts.Diagnostics.Watch_input_files,
-        },
-        // Basic
-        {
-            name: "target",
-            shortName: "t",
-            type: ts.createMapFromTemplate({
-                es3: 0 /* ES3 */,
-                es5: 1 /* ES5 */,
-                es6: 2 /* ES2015 */,
-                es2015: 2 /* ES2015 */,
-                es2016: 3 /* ES2016 */,
-                es2017: 4 /* ES2017 */,
-                es2018: 5 /* ES2018 */,
-                esnext: 6 /* ESNext */,
-            }),
-            paramType: ts.Diagnostics.VERSION,
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Specify_ECMAScript_target_version_Colon_ES3_default_ES5_ES2015_ES2016_ES2017_ES2018_or_ESNEXT,
-        },
-        {
-            name: "module",
-            shortName: "m",
-            type: ts.createMapFromTemplate({
-                none: ts.ModuleKind.None,
-                commonjs: ts.ModuleKind.CommonJS,
-                amd: ts.ModuleKind.AMD,
-                system: ts.ModuleKind.System,
-                umd: ts.ModuleKind.UMD,
-                es6: ts.ModuleKind.ES2015,
-                es2015: ts.ModuleKind.ES2015,
-                esnext: ts.ModuleKind.ESNext
-            }),
-            paramType: ts.Diagnostics.KIND,
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Specify_module_code_generation_Colon_none_commonjs_amd_system_umd_es2015_or_ESNext,
-        },
-        {
-            name: "lib",
-            type: "list",
-            element: {
-                name: "lib",
-                type: ts.createMapFromTemplate({
-                    // JavaScript only
-                    "es5": "lib.es5.d.ts",
-                    "es6": "lib.es2015.d.ts",
-                    "es2015": "lib.es2015.d.ts",
-                    "es7": "lib.es2016.d.ts",
-                    "es2016": "lib.es2016.d.ts",
-                    "es2017": "lib.es2017.d.ts",
-                    "es2018": "lib.es2018.d.ts",
-                    "esnext": "lib.esnext.d.ts",
-                    // Host only
-                    "dom": "lib.dom.d.ts",
-                    "dom.iterable": "lib.dom.iterable.d.ts",
-                    "webworker": "lib.webworker.d.ts",
-                    "scripthost": "lib.scripthost.d.ts",
-                    // ES2015 Or ESNext By-feature options
-                    "es2015.core": "lib.es2015.core.d.ts",
-                    "es2015.collection": "lib.es2015.collection.d.ts",
-                    "es2015.generator": "lib.es2015.generator.d.ts",
-                    "es2015.iterable": "lib.es2015.iterable.d.ts",
-                    "es2015.promise": "lib.es2015.promise.d.ts",
-                    "es2015.proxy": "lib.es2015.proxy.d.ts",
-                    "es2015.reflect": "lib.es2015.reflect.d.ts",
-                    "es2015.symbol": "lib.es2015.symbol.d.ts",
-                    "es2015.symbol.wellknown": "lib.es2015.symbol.wellknown.d.ts",
-                    "es2016.array.include": "lib.es2016.array.include.d.ts",
-                    "es2017.object": "lib.es2017.object.d.ts",
-                    "es2017.sharedmemory": "lib.es2017.sharedmemory.d.ts",
-                    "es2017.string": "lib.es2017.string.d.ts",
-                    "es2017.intl": "lib.es2017.intl.d.ts",
-                    "es2017.typedarrays": "lib.es2017.typedarrays.d.ts",
-                    "es2018.intl": "lib.es2018.intl.d.ts",
-                    "es2018.promise": "lib.es2018.promise.d.ts",
-                    "es2018.regexp": "lib.es2018.regexp.d.ts",
-                    "esnext.array": "lib.esnext.array.d.ts",
-                    "esnext.symbol": "lib.esnext.symbol.d.ts",
-                    "esnext.asynciterable": "lib.esnext.asynciterable.d.ts",
-                }),
-            },
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Specify_library_files_to_be_included_in_the_compilation
-        },
-        {
-            name: "allowJs",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Allow_javascript_files_to_be_compiled
-        },
-        {
-            name: "checkJs",
-            type: "boolean",
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Report_errors_in_js_files
-        },
-        {
-            name: "jsx",
-            type: ts.createMapFromTemplate({
-                "preserve": 1 /* Preserve */,
-                "react-native": 3 /* ReactNative */,
-                "react": 2 /* React */
-            }),
-            paramType: ts.Diagnostics.KIND,
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Specify_JSX_code_generation_Colon_preserve_react_native_or_react,
-        },
-        {
-            name: "declaration",
-            shortName: "d",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Generates_corresponding_d_ts_file,
-        },
-        {
-            name: "declarationMap",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Generates_a_sourcemap_for_each_corresponding_d_ts_file,
-        },
-        {
-            name: "emitDeclarationOnly",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Only_emit_d_ts_declaration_files,
-        },
-        {
-            name: "sourceMap",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Generates_corresponding_map_file,
-        },
-        {
-            name: "outFile",
-            type: "string",
-            isFilePath: true,
-            paramType: ts.Diagnostics.FILE,
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Concatenate_and_emit_output_to_single_file,
-        },
-        {
-            name: "outDir",
-            type: "string",
-            isFilePath: true,
-            paramType: ts.Diagnostics.DIRECTORY,
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Redirect_output_structure_to_the_directory,
-        },
-        {
-            name: "rootDir",
-            type: "string",
-            isFilePath: true,
-            paramType: ts.Diagnostics.LOCATION,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Specify_the_root_directory_of_input_files_Use_to_control_the_output_directory_structure_with_outDir,
-        },
-        {
-            name: "composite",
-            type: "boolean",
-            isTSConfigOnly: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Enable_project_compilation,
-        },
-        {
-            name: "removeComments",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Do_not_emit_comments_to_output,
-        },
-        {
-            name: "noEmit",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Do_not_emit_outputs,
-        },
-        {
-            name: "importHelpers",
-            type: "boolean",
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Import_emit_helpers_from_tslib
-        },
-        {
-            name: "downlevelIteration",
-            type: "boolean",
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Provide_full_support_for_iterables_in_for_of_spread_and_destructuring_when_targeting_ES5_or_ES3
-        },
-        {
-            name: "isolatedModules",
-            type: "boolean",
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Transpile_each_file_as_a_separate_module_similar_to_ts_transpileModule
-        },
-        // Strict Type Checks
-        {
-            name: "strict",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Strict_Type_Checking_Options,
-            description: ts.Diagnostics.Enable_all_strict_type_checking_options
-        },
-        {
-            name: "noImplicitAny",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Strict_Type_Checking_Options,
-            description: ts.Diagnostics.Raise_error_on_expressions_and_declarations_with_an_implied_any_type,
-        },
-        {
-            name: "strictNullChecks",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Strict_Type_Checking_Options,
-            description: ts.Diagnostics.Enable_strict_null_checks
-        },
-        {
-            name: "strictFunctionTypes",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Strict_Type_Checking_Options,
-            description: ts.Diagnostics.Enable_strict_checking_of_function_types
-        },
-        {
-            name: "strictPropertyInitialization",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Strict_Type_Checking_Options,
-            description: ts.Diagnostics.Enable_strict_checking_of_property_initialization_in_classes
-        },
-        {
-            name: "noImplicitThis",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Strict_Type_Checking_Options,
-            description: ts.Diagnostics.Raise_error_on_this_expressions_with_an_implied_any_type,
-        },
-        {
-            name: "alwaysStrict",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Strict_Type_Checking_Options,
-            description: ts.Diagnostics.Parse_in_strict_mode_and_emit_use_strict_for_each_source_file
-        },
-        // Additional Checks
-        {
-            name: "noUnusedLocals",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Additional_Checks,
-            description: ts.Diagnostics.Report_errors_on_unused_locals,
-        },
-        {
-            name: "noUnusedParameters",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Additional_Checks,
-            description: ts.Diagnostics.Report_errors_on_unused_parameters,
-        },
-        {
-            name: "noImplicitReturns",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Additional_Checks,
-            description: ts.Diagnostics.Report_error_when_not_all_code_paths_in_function_return_a_value
-        },
-        {
-            name: "noFallthroughCasesInSwitch",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Additional_Checks,
-            description: ts.Diagnostics.Report_errors_for_fallthrough_cases_in_switch_statement
-        },
-        // Module Resolution
-        {
-            name: "moduleResolution",
-            type: ts.createMapFromTemplate({
-                node: ts.ModuleResolutionKind.NodeJs,
-                classic: ts.ModuleResolutionKind.Classic,
-            }),
-            paramType: ts.Diagnostics.STRATEGY,
-            category: ts.Diagnostics.Module_Resolution_Options,
-            description: ts.Diagnostics.Specify_module_resolution_strategy_Colon_node_Node_js_or_classic_TypeScript_pre_1_6,
-        },
-        {
-            name: "baseUrl",
-            type: "string",
-            isFilePath: true,
-            category: ts.Diagnostics.Module_Resolution_Options,
-            description: ts.Diagnostics.Base_directory_to_resolve_non_absolute_module_names
-        },
-        {
-            // this option can only be specified in tsconfig.json
-            // use type = object to copy the value as-is
-            name: "paths",
-            type: "object",
-            isTSConfigOnly: true,
-            category: ts.Diagnostics.Module_Resolution_Options,
-            description: ts.Diagnostics.A_series_of_entries_which_re_map_imports_to_lookup_locations_relative_to_the_baseUrl
-        },
-        {
-            // this option can only be specified in tsconfig.json
-            // use type = object to copy the value as-is
-            name: "rootDirs",
-            type: "list",
-            isTSConfigOnly: true,
-            element: {
-                name: "rootDirs",
-                type: "string",
-                isFilePath: true
-            },
-            category: ts.Diagnostics.Module_Resolution_Options,
-            description: ts.Diagnostics.List_of_root_folders_whose_combined_content_represents_the_structure_of_the_project_at_runtime
-        },
-        {
-            name: "typeRoots",
-            type: "list",
-            element: {
-                name: "typeRoots",
-                type: "string",
-                isFilePath: true
-            },
-            category: ts.Diagnostics.Module_Resolution_Options,
-            description: ts.Diagnostics.List_of_folders_to_include_type_definitions_from
-        },
-        {
-            name: "types",
-            type: "list",
-            element: {
-                name: "types",
-                type: "string"
-            },
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Module_Resolution_Options,
-            description: ts.Diagnostics.Type_declaration_files_to_be_included_in_compilation
-        },
-        {
-            name: "allowSyntheticDefaultImports",
-            type: "boolean",
-            category: ts.Diagnostics.Module_Resolution_Options,
-            description: ts.Diagnostics.Allow_default_imports_from_modules_with_no_default_export_This_does_not_affect_code_emit_just_typechecking
-        },
-        {
-            name: "esModuleInterop",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Module_Resolution_Options,
-            description: ts.Diagnostics.Enables_emit_interoperability_between_CommonJS_and_ES_Modules_via_creation_of_namespace_objects_for_all_imports_Implies_allowSyntheticDefaultImports
-        },
-        {
-            name: "preserveSymlinks",
-            type: "boolean",
-            category: ts.Diagnostics.Module_Resolution_Options,
-            description: ts.Diagnostics.Do_not_resolve_the_real_path_of_symlinks,
-        },
-        // Source Maps
-        {
-            name: "sourceRoot",
-            type: "string",
-            isFilePath: true,
-            paramType: ts.Diagnostics.LOCATION,
-            category: ts.Diagnostics.Source_Map_Options,
-            description: ts.Diagnostics.Specify_the_location_where_debugger_should_locate_TypeScript_files_instead_of_source_locations,
-        },
-        {
-            name: "mapRoot",
-            type: "string",
-            isFilePath: true,
-            paramType: ts.Diagnostics.LOCATION,
-            category: ts.Diagnostics.Source_Map_Options,
-            description: ts.Diagnostics.Specify_the_location_where_debugger_should_locate_map_files_instead_of_generated_locations,
-        },
-        {
-            name: "inlineSourceMap",
-            type: "boolean",
-            category: ts.Diagnostics.Source_Map_Options,
-            description: ts.Diagnostics.Emit_a_single_file_with_source_maps_instead_of_having_a_separate_file
-        },
-        {
-            name: "inlineSources",
-            type: "boolean",
-            category: ts.Diagnostics.Source_Map_Options,
-            description: ts.Diagnostics.Emit_the_source_alongside_the_sourcemaps_within_a_single_file_requires_inlineSourceMap_or_sourceMap_to_be_set
-        },
-        // Experimental
-        {
-            name: "experimentalDecorators",
-            type: "boolean",
-            category: ts.Diagnostics.Experimental_Options,
-            description: ts.Diagnostics.Enables_experimental_support_for_ES7_decorators
-        },
-        {
-            name: "emitDecoratorMetadata",
-            type: "boolean",
-            category: ts.Diagnostics.Experimental_Options,
-            description: ts.Diagnostics.Enables_experimental_support_for_emitting_type_metadata_for_decorators
-        },
-        // Advanced
-        {
-            name: "jsxFactory",
-            type: "string",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Specify_the_JSX_factory_function_to_use_when_targeting_react_JSX_emit_e_g_React_createElement_or_h
-        },
-        {
-            name: "diagnostics",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Show_diagnostic_information
-        },
-        {
-            name: "extendedDiagnostics",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Show_verbose_diagnostic_information
-        },
-        {
-            name: "traceResolution",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Enable_tracing_of_the_name_resolution_process
-        },
-        {
-            name: "resolveJsonModule",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Include_modules_imported_with_json_extension
-        },
-        {
-            name: "listFiles",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Print_names_of_files_part_of_the_compilation
-        },
-        {
-            name: "listEmittedFiles",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Print_names_of_generated_files_part_of_the_compilation
-        },
-        {
-            name: "out",
-            type: "string",
-            isFilePath: false,
-            // for correct behaviour, please use outFile
-            category: ts.Diagnostics.Advanced_Options,
-            paramType: ts.Diagnostics.FILE,
-            description: ts.Diagnostics.Deprecated_Use_outFile_instead_Concatenate_and_emit_output_to_single_file,
-        },
-        {
-            name: "reactNamespace",
-            type: "string",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Deprecated_Use_jsxFactory_instead_Specify_the_object_invoked_for_createElement_when_targeting_react_JSX_emit
-        },
-        {
-            name: "skipDefaultLibCheck",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Deprecated_Use_skipLibCheck_instead_Skip_type_checking_of_default_library_declaration_files
-        },
-        {
-            name: "charset",
-            type: "string",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.The_character_set_of_the_input_files
-        },
-        {
-            name: "emitBOM",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Emit_a_UTF_8_Byte_Order_Mark_BOM_in_the_beginning_of_output_files
-        },
-        {
-            name: "locale",
-            type: "string",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.The_locale_used_when_displaying_messages_to_the_user_e_g_en_us
-        },
-        {
-            name: "newLine",
-            type: ts.createMapFromTemplate({
-                crlf: 0 /* CarriageReturnLineFeed */,
-                lf: 1 /* LineFeed */
-            }),
-            paramType: ts.Diagnostics.NEWLINE,
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Specify_the_end_of_line_sequence_to_be_used_when_emitting_files_Colon_CRLF_dos_or_LF_unix,
-        },
-        {
-            name: "noErrorTruncation",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Do_not_truncate_error_messages
-        },
-        {
-            name: "noLib",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Do_not_include_the_default_library_file_lib_d_ts
-        },
-        {
-            name: "noResolve",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Do_not_add_triple_slash_references_or_imported_modules_to_the_list_of_compiled_files
-        },
-        {
-            name: "stripInternal",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Do_not_emit_declarations_for_code_that_has_an_internal_annotation,
-        },
-        {
-            name: "disableSizeLimit",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Disable_size_limitations_on_JavaScript_projects
-        },
-        {
-            name: "noImplicitUseStrict",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Do_not_emit_use_strict_directives_in_module_output
-        },
-        {
-            name: "noEmitHelpers",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Do_not_generate_custom_helper_functions_like_extends_in_compiled_output
-        },
-        {
-            name: "noEmitOnError",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Do_not_emit_outputs_if_any_errors_were_reported,
-        },
-        {
-            name: "preserveConstEnums",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Do_not_erase_const_enum_declarations_in_generated_code
-        },
-        {
-            name: "declarationDir",
-            type: "string",
-            isFilePath: true,
-            paramType: ts.Diagnostics.DIRECTORY,
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Output_directory_for_generated_declaration_files
-        },
-        {
-            name: "skipLibCheck",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Skip_type_checking_of_declaration_files,
-        },
-        {
-            name: "allowUnusedLabels",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Do_not_report_errors_on_unused_labels
-        },
-        {
-            name: "allowUnreachableCode",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Do_not_report_errors_on_unreachable_code
-        },
-        {
-            name: "suppressExcessPropertyErrors",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Suppress_excess_property_checks_for_object_literals,
-        },
-        {
-            name: "suppressImplicitAnyIndexErrors",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Suppress_noImplicitAny_errors_for_indexing_objects_lacking_index_signatures,
-        },
-        {
-            name: "forceConsistentCasingInFileNames",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Disallow_inconsistently_cased_references_to_the_same_file
-        },
-        {
-            name: "maxNodeModuleJsDepth",
-            type: "number",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.The_maximum_dependency_depth_to_search_under_node_modules_and_load_JavaScript_files
-        },
-        {
-            name: "noStrictGenericChecks",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Disable_strict_checking_of_generic_signatures_in_function_types,
-        },
-        {
-            name: "keyofStringsOnly",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Resolve_keyof_to_string_valued_property_names_only_no_numbers_or_symbols,
-        },
-        {
-            // A list of plugins to load in the language service
-            name: "plugins",
-            type: "list",
-            isTSConfigOnly: true,
-            element: {
-                name: "plugin",
-                type: "object"
-            },
-            description: ts.Diagnostics.List_of_language_service_plugins
+            type: "boolean"
         }
     ];
-    /* @internal */
-    ts.typeAcquisitionDeclarations = [
-        {
-            /* @deprecated typingOptions.enableAutoDiscovery
-             * Use typeAcquisition.enable instead.
-             */
-            name: "enableAutoDiscovery",
-            type: "boolean",
-        },
-        {
-            name: "enable",
-            type: "boolean",
-        },
-        {
-            name: "include",
-            type: "list",
-            element: {
-                name: "include",
-                type: "string"
+    function performBuild(args, compilerHost, buildHost, system) {
+        var verbose = false;
+        var dry = false;
+        var force = false;
+        var clean = false;
+        var watch = false;
+        var projects = [];
+        for (var _i = 0, args_3 = args; _i < args_3.length; _i++) {
+            var arg = args_3[_i];
+            switch (arg.toLowerCase()) {
+                case "-v":
+                case "--verbose":
+                    verbose = true;
+                    continue;
+                case "-d":
+                case "--dry":
+                    dry = true;
+                    continue;
+                case "-f":
+                case "--force":
+                    force = true;
+                    continue;
+                case "--clean":
+                    clean = true;
+                    continue;
+                case "--watch":
+                case "-w":
+                    watch = true;
+                    continue;
+                case "--?":
+                case "-?":
+                case "--help":
+                    return ts.printHelp(buildOpts, "--build ");
             }
-        },
-        {
-            name: "exclude",
-            type: "list",
-            element: {
-                name: "exclude",
-                type: "string"
+            // Not a flag, parse as filename
+            addProject(arg);
+        }
+        // Nonsensical combinations
+        if (clean && force) {
+            return buildHost.error(ts.Diagnostics.Options_0_and_1_cannot_be_combined, "clean", "force");
+        }
+        if (clean && verbose) {
+            return buildHost.error(ts.Diagnostics.Options_0_and_1_cannot_be_combined, "clean", "verbose");
+        }
+        if (clean && watch) {
+            return buildHost.error(ts.Diagnostics.Options_0_and_1_cannot_be_combined, "clean", "watch");
+        }
+        if (watch && dry) {
+            return buildHost.error(ts.Diagnostics.Options_0_and_1_cannot_be_combined, "watch", "dry");
+        }
+        if (projects.length === 0) {
+            // tsc -b invoked with no extra arguments; act as if invoked with "tsc -b ."
+            addProject(".");
+        }
+        var builder = createSolutionBuilder(compilerHost, buildHost, projects, { dry: dry, force: force, verbose: verbose }, system);
+        if (clean) {
+            builder.cleanAllProjects();
+        }
+        else {
+            builder.buildAllProjects();
+        }
+        if (watch) {
+            return builder.startWatching();
+        }
+        function addProject(projectSpecification) {
+            var fileName = ts.resolvePath(compilerHost.getCurrentDirectory(), projectSpecification);
+            var refPath = ts.resolveProjectReferencePath(compilerHost, { path: fileName });
+            if (!refPath) {
+                return buildHost.error(ts.Diagnostics.File_0_does_not_exist, projectSpecification);
             }
-        }
-    ];
-    /* @internal */
-    ts.defaultInitCompilerOptions = {
-        module: ts.ModuleKind.CommonJS,
-        target: 1 /* ES5 */,
-        strict: true,
-        esModuleInterop: true
-    };
-    var optionNameMapCache;
-    /* @internal */
-    function convertEnableAutoDiscoveryToEnable(typeAcquisition) {
-        // Convert deprecated typingOptions.enableAutoDiscovery to typeAcquisition.enable
-        if (typeAcquisition && typeAcquisition.enableAutoDiscovery !== undefined && typeAcquisition.enable === undefined) {
-            return {
-                enable: typeAcquisition.enableAutoDiscovery,
-                include: typeAcquisition.include || [],
-                exclude: typeAcquisition.exclude || []
-            };
-        }
-        return typeAcquisition;
-    }
-    ts.convertEnableAutoDiscoveryToEnable = convertEnableAutoDiscoveryToEnable;
-    function getOptionNameMap() {
-        if (optionNameMapCache) {
-            return optionNameMapCache;
-        }
-        var optionNameMap = ts.createMap();
-        var shortOptionNames = ts.createMap();
-        ts.forEach(ts.optionDeclarations, function (option) {
-            optionNameMap.set(option.name.toLowerCase(), option);
-            if (option.shortName) {
-                shortOptionNames.set(option.shortName, option.name);
+            if (!compilerHost.fileExists(refPath)) {
+                return buildHost.error(ts.Diagnostics.File_0_does_not_exist, fileName);
             }
-        });
-        optionNameMapCache = { optionNameMap: optionNameMap, shortOptionNames: shortOptionNames };
-        return optionNameMapCache;
-    }
-    /* @internal */
-    function createCompilerDiagnosticForInvalidCustomType(opt) {
-        return createDiagnosticForInvalidCustomType(opt, ts.createCompilerDiagnostic);
-    }
-    ts.createCompilerDiagnosticForInvalidCustomType = createCompilerDiagnosticForInvalidCustomType;
-    function createDiagnosticForInvalidCustomType(opt, createDiagnostic) {
-        var namesOfType = ts.arrayFrom(opt.type.keys()).map(function (key) { return "'" + key + "'"; }).join(", ");
-        return createDiagnostic(ts.Diagnostics.Argument_for_0_option_must_be_Colon_1, "--" + opt.name, namesOfType);
-    }
-    /* @internal */
-    function parseCustomTypeOption(opt, value, errors) {
-        return convertJsonOptionOfCustomType(opt, trimString(value || ""), errors);
-    }
-    ts.parseCustomTypeOption = parseCustomTypeOption;
-    /* @internal */
-    function parseListTypeOption(opt, value, errors) {
-        if (value === void 0) { value = ""; }
-        value = trimString(value);
-        if (ts.startsWith(value, "-")) {
-            return undefined;
-        }
-        if (value === "") {
-            return [];
-        }
-        var values = value.split(",");
-        switch (opt.element.type) {
-            case "number":
-                return ts.map(values, parseInt);
-            case "string":
-                return ts.map(values, function (v) { return v || ""; });
-            default:
-                return ts.mapDefined(values, function (v) { return parseCustomTypeOption(opt.element, v, errors); });
+            projects.push(refPath);
         }
     }
-    ts.parseListTypeOption = parseListTypeOption;
-    function parseCommandLine(commandLine, readFile) {
-        var options = {};
-        var fileNames = [];
-        var projectReferences = undefined;
-        var errors = [];
-        parseStrings(commandLine);
+    ts.performBuild = performBuild;
+    /**
+     * A SolutionBuilder has an immutable set of rootNames that are the "entry point" projects, but
+     * can dynamically add/remove other projects based on changes on the rootNames' references
+     */
+    function createSolutionBuilder(compilerHost, buildHost, rootNames, defaultOptions, system) {
+        if (!compilerHost.getModifiedTime || !compilerHost.setModifiedTime) {
+            throw new Error("Host must support timestamp APIs");
+        }
+        var configFileCache = createConfigFileCache(compilerHost);
+        var context = createBuildContext(defaultOptions);
+        var existingWatchersForWildcards = ts.createMap();
         return {
-            options: options,
-            fileNames: fileNames,
-            projectReferences: projectReferences,
-            errors: errors
+            buildAllProjects: buildAllProjects,
+            getUpToDateStatus: getUpToDateStatus,
+            getUpToDateStatusOfFile: getUpToDateStatusOfFile,
+            cleanAllProjects: cleanAllProjects,
+            resetBuildContext: resetBuildContext,
+            getBuildGraph: getBuildGraph,
+            invalidateProject: invalidateProject,
+            buildInvalidatedProjects: buildInvalidatedProjects,
+            buildDependentInvalidatedProjects: buildDependentInvalidatedProjects,
+            resolveProjectName: resolveProjectName,
+            startWatching: startWatching
         };
-        function parseStrings(args) {
-            var i = 0;
-            while (i < args.length) {
-                var s = args[i];
-                i++;
-                if (s.charCodeAt(0) === 64 /* at */) {
-                    parseResponseFile(s.slice(1));
-                }
-                else if (s.charCodeAt(0) === 45 /* minus */) {
-                    var opt = getOptionFromName(s.slice(s.charCodeAt(1) === 45 /* minus */ ? 2 : 1), /*allowShort*/ true);
-                    if (opt) {
-                        if (opt.isTSConfigOnly) {
-                            errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Option_0_can_only_be_specified_in_tsconfig_json_file, opt.name));
-                        }
-                        else {
-                            // Check to see if no argument was provided (e.g. "--locale" is the last command-line argument).
-                            if (!args[i] && opt.type !== "boolean") {
-                                errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Compiler_option_0_expects_an_argument, opt.name));
-                            }
-                            switch (opt.type) {
-                                case "number":
-                                    options[opt.name] = parseInt(args[i]);
-                                    i++;
-                                    break;
-                                case "boolean":
-                                    // boolean flag has optional value true, false, others
-                                    var optValue = args[i];
-                                    options[opt.name] = optValue !== "false";
-                                    // consume next argument as boolean flag value
-                                    if (optValue === "false" || optValue === "true") {
-                                        i++;
-                                    }
-                                    break;
-                                case "string":
-                                    options[opt.name] = args[i] || "";
-                                    i++;
-                                    break;
-                                case "list":
-                                    var result = parseListTypeOption(opt, args[i], errors);
-                                    options[opt.name] = result || [];
-                                    if (result) {
-                                        i++;
-                                    }
-                                    break;
-                                // If not a primitive, the possible types are specified in what is effectively a map of options.
-                                default:
-                                    options[opt.name] = parseCustomTypeOption(opt, args[i], errors);
-                                    i++;
-                                    break;
-                            }
-                        }
-                    }
-                    else {
-                        errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Unknown_compiler_option_0, s));
-                    }
-                }
-                else {
-                    fileNames.push(s);
-                }
-            }
-        }
-        function parseResponseFile(fileName) {
-            var text = readFile ? readFile(fileName) : ts.sys.readFile(fileName);
-            if (!text) {
-                errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.File_0_not_found, fileName));
+        function startWatching() {
+            if (!system)
+                throw new Error("System host must be provided if using --watch");
+            if (!system.watchFile || !system.watchDirectory || !system.setTimeout)
+                throw new Error("System host must support watchFile / watchDirectory / setTimeout if using --watch");
+            var graph = getGlobalDependencyGraph();
+            if (!graph.buildQueue) {
+                // Everything is broken - we don't even know what to watch. Give up.
                 return;
             }
-            var args = [];
-            var pos = 0;
-            while (true) {
-                while (pos < text.length && text.charCodeAt(pos) <= 32 /* space */)
-                    pos++;
-                if (pos >= text.length)
-                    break;
-                var start = pos;
-                if (text.charCodeAt(start) === 34 /* doubleQuote */) {
-                    pos++;
-                    while (pos < text.length && text.charCodeAt(pos) !== 34 /* doubleQuote */)
-                        pos++;
-                    if (pos < text.length) {
-                        args.push(text.substring(start + 1, pos));
-                        pos++;
-                    }
-                    else {
-                        errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Unterminated_quoted_string_in_response_file_0, fileName));
-                    }
-                }
-                else {
-                    while (text.charCodeAt(pos) > 32 /* space */)
-                        pos++;
-                    args.push(text.substring(start, pos));
-                }
-            }
-            parseStrings(args);
-        }
-    }
-    ts.parseCommandLine = parseCommandLine;
-    /** @internal */
-    function getOptionFromName(optionName, allowShort) {
-        if (allowShort === void 0) { allowShort = false; }
-        optionName = optionName.toLowerCase();
-        var _a = getOptionNameMap(), optionNameMap = _a.optionNameMap, shortOptionNames = _a.shortOptionNames;
-        // Try to translate short option names to their full equivalents.
-        if (allowShort) {
-            var short = shortOptionNames.get(optionName);
-            if (short !== undefined) {
-                optionName = short;
-            }
-        }
-        return optionNameMap.get(optionName);
-    }
-    ts.getOptionFromName = getOptionFromName;
-    /**
-     * Reads the config file, reports errors if any and exits if the config file cannot be found
-     */
-    function getParsedCommandLineOfConfigFile(configFileName, optionsToExtend, host) {
-        var configFileText;
-        try {
-            configFileText = host.readFile(configFileName);
-        }
-        catch (e) {
-            var error = ts.createCompilerDiagnostic(ts.Diagnostics.Cannot_read_file_0_Colon_1, configFileName, e.message);
-            host.onUnRecoverableConfigFileDiagnostic(error);
-            return undefined;
-        }
-        if (!configFileText) {
-            var error = ts.createCompilerDiagnostic(ts.Diagnostics.File_0_not_found, configFileName);
-            host.onUnRecoverableConfigFileDiagnostic(error);
-            return undefined;
-        }
-        var result = ts.parseJsonText(configFileName, configFileText);
-        var cwd = host.getCurrentDirectory();
-        return parseJsonSourceFileConfigFileContent(result, host, ts.getNormalizedAbsolutePath(ts.getDirectoryPath(configFileName), cwd), optionsToExtend, ts.getNormalizedAbsolutePath(configFileName, cwd));
-    }
-    ts.getParsedCommandLineOfConfigFile = getParsedCommandLineOfConfigFile;
-    /**
-     * Read tsconfig.json file
-     * @param fileName The path to the config file
-     */
-    function readConfigFile(fileName, readFile) {
-        var textOrDiagnostic = tryReadFile(fileName, readFile);
-        return ts.isString(textOrDiagnostic) ? parseConfigFileTextToJson(fileName, textOrDiagnostic) : { config: {}, error: textOrDiagnostic };
-    }
-    ts.readConfigFile = readConfigFile;
-    /**
-     * Parse the text of the tsconfig.json file
-     * @param fileName The path to the config file
-     * @param jsonText The text of the config file
-     */
-    function parseConfigFileTextToJson(fileName, jsonText) {
-        var jsonSourceFile = ts.parseJsonText(fileName, jsonText);
-        return {
-            config: convertToObject(jsonSourceFile, jsonSourceFile.parseDiagnostics),
-            error: jsonSourceFile.parseDiagnostics.length ? jsonSourceFile.parseDiagnostics[0] : undefined
-        };
-    }
-    ts.parseConfigFileTextToJson = parseConfigFileTextToJson;
-    /**
-     * Read tsconfig.json file
-     * @param fileName The path to the config file
-     */
-    function readJsonConfigFile(fileName, readFile) {
-        var textOrDiagnostic = tryReadFile(fileName, readFile);
-        return ts.isString(textOrDiagnostic) ? ts.parseJsonText(fileName, textOrDiagnostic) : { parseDiagnostics: [textOrDiagnostic] };
-    }
-    ts.readJsonConfigFile = readJsonConfigFile;
-    function tryReadFile(fileName, readFile) {
-        var text;
-        try {
-            text = readFile(fileName);
-        }
-        catch (e) {
-            return ts.createCompilerDiagnostic(ts.Diagnostics.Cannot_read_file_0_Colon_1, fileName, e.message);
-        }
-        return text === undefined ? ts.createCompilerDiagnostic(ts.Diagnostics.The_specified_path_does_not_exist_Colon_0, fileName) : text;
-    }
-    function commandLineOptionsToMap(options) {
-        return ts.arrayToMap(options, function (option) { return option.name; });
-    }
-    var _tsconfigRootOptions;
-    function getTsconfigRootOptionsMap() {
-        if (_tsconfigRootOptions === undefined) {
-            _tsconfigRootOptions = {
-                name: undefined,
-                type: "object",
-                elementOptions: commandLineOptionsToMap([
-                    {
-                        name: "compilerOptions",
-                        type: "object",
-                        elementOptions: commandLineOptionsToMap(ts.optionDeclarations),
-                        extraKeyDiagnosticMessage: ts.Diagnostics.Unknown_compiler_option_0
-                    },
-                    {
-                        name: "typingOptions",
-                        type: "object",
-                        elementOptions: commandLineOptionsToMap(ts.typeAcquisitionDeclarations),
-                        extraKeyDiagnosticMessage: ts.Diagnostics.Unknown_type_acquisition_option_0
-                    },
-                    {
-                        name: "typeAcquisition",
-                        type: "object",
-                        elementOptions: commandLineOptionsToMap(ts.typeAcquisitionDeclarations),
-                        extraKeyDiagnosticMessage: ts.Diagnostics.Unknown_type_acquisition_option_0
-                    },
-                    {
-                        name: "extends",
-                        type: "string"
-                    },
-                    {
-                        name: "references",
-                        type: "list",
-                        element: {
-                            name: "references",
-                            type: "object"
-                        }
-                    },
-                    {
-                        name: "files",
-                        type: "list",
-                        element: {
-                            name: "files",
-                            type: "string"
-                        }
-                    },
-                    {
-                        name: "include",
-                        type: "list",
-                        element: {
-                            name: "include",
-                            type: "string"
-                        }
-                    },
-                    {
-                        name: "exclude",
-                        type: "list",
-                        element: {
-                            name: "exclude",
-                            type: "string"
-                        }
-                    },
-                    ts.compileOnSaveCommandLineOption
-                ])
-            };
-        }
-        return _tsconfigRootOptions;
-    }
-    /**
-     * Convert the json syntax tree into the json value
-     */
-    function convertToObject(sourceFile, errors) {
-        return convertToObjectWorker(sourceFile, errors, /*returnValue*/ true, /*knownRootOptions*/ undefined, /*jsonConversionNotifier*/ undefined);
-    }
-    ts.convertToObject = convertToObject;
-    /**
-     * Convert the json syntax tree into the json value and report errors
-     * This returns the json value (apart from checking errors) only if returnValue provided is true.
-     * Otherwise it just checks the errors and returns undefined
-     */
-    /*@internal*/
-    function convertToObjectWorker(sourceFile, errors, returnValue, knownRootOptions, jsonConversionNotifier) {
-        if (!sourceFile.statements.length) {
-            return returnValue ? {} : undefined;
-        }
-        return convertPropertyValueToJson(sourceFile.statements[0].expression, knownRootOptions);
-        function isRootOptionMap(knownOptions) {
-            return knownRootOptions && knownRootOptions.elementOptions === knownOptions;
-        }
-        function convertObjectLiteralExpressionToJson(node, knownOptions, extraKeyDiagnosticMessage, parentOption) {
-            var result = returnValue ? {} : undefined;
-            for (var _i = 0, _a = node.properties; _i < _a.length; _i++) {
-                var element = _a[_i];
-                if (element.kind !== 270 /* PropertyAssignment */) {
-                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, element, ts.Diagnostics.Property_assignment_expected));
-                    continue;
-                }
-                if (element.questionToken) {
-                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, element.questionToken, ts.Diagnostics._0_can_only_be_used_in_a_ts_file, "?"));
-                }
-                if (!isDoubleQuotedString(element.name)) {
-                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, element.name, ts.Diagnostics.String_literal_with_double_quotes_expected));
-                }
-                var keyText = ts.unescapeLeadingUnderscores(ts.getTextOfPropertyName(element.name));
-                var option = knownOptions ? knownOptions.get(keyText) : undefined;
-                if (extraKeyDiagnosticMessage && !option) {
-                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, element.name, extraKeyDiagnosticMessage, keyText));
-                }
-                var value = convertPropertyValueToJson(element.initializer, option);
-                if (typeof keyText !== "undefined") {
-                    if (returnValue) {
-                        result[keyText] = value;
-                    }
-                    // Notify key value set, if user asked for it
-                    if (jsonConversionNotifier &&
-                        // Current callbacks are only on known parent option or if we are setting values in the root
-                        (parentOption || isRootOptionMap(knownOptions))) {
-                        var isValidOptionValue = isCompilerOptionsValue(option, value);
-                        if (parentOption) {
-                            if (isValidOptionValue) {
-                                // Notify option set in the parent if its a valid option value
-                                jsonConversionNotifier.onSetValidOptionKeyValueInParent(parentOption, option, value);
-                            }
-                        }
-                        else if (isRootOptionMap(knownOptions)) {
-                            if (isValidOptionValue) {
-                                // Notify about the valid root key value being set
-                                jsonConversionNotifier.onSetValidOptionKeyValueInRoot(keyText, element.name, value, element.initializer);
-                            }
-                            else if (!option) {
-                                // Notify about the unknown root key value being set
-                                jsonConversionNotifier.onSetUnknownOptionKeyValueInRoot(keyText, element.name, value, element.initializer);
-                            }
-                        }
-                    }
-                }
-            }
-            return result;
-        }
-        function convertArrayLiteralExpressionToJson(elements, elementOption) {
-            return (returnValue ? elements.map : elements.forEach).call(elements, function (element) { return convertPropertyValueToJson(element, elementOption); });
-        }
-        function convertPropertyValueToJson(valueExpression, option) {
-            switch (valueExpression.kind) {
-                case 101 /* TrueKeyword */:
-                    reportInvalidOptionValue(option && option.type !== "boolean");
-                    return true;
-                case 86 /* FalseKeyword */:
-                    reportInvalidOptionValue(option && option.type !== "boolean");
-                    return false;
-                case 95 /* NullKeyword */:
-                    reportInvalidOptionValue(option && option.name === "extends"); // "extends" is the only option we don't allow null/undefined for
-                    return null; // tslint:disable-line:no-null-keyword
-                case 9 /* StringLiteral */:
-                    if (!isDoubleQuotedString(valueExpression)) {
-                        errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, valueExpression, ts.Diagnostics.String_literal_with_double_quotes_expected));
-                    }
-                    reportInvalidOptionValue(option && (ts.isString(option.type) && option.type !== "string"));
-                    var text = valueExpression.text;
-                    if (option && !ts.isString(option.type)) {
-                        var customOption = option;
-                        // Validate custom option type
-                        if (!customOption.type.has(text.toLowerCase())) {
-                            errors.push(createDiagnosticForInvalidCustomType(customOption, function (message, arg0, arg1) { return ts.createDiagnosticForNodeInSourceFile(sourceFile, valueExpression, message, arg0, arg1); }));
-                        }
-                    }
-                    return text;
-                case 8 /* NumericLiteral */:
-                    reportInvalidOptionValue(option && option.type !== "number");
-                    return Number(valueExpression.text);
-                case 198 /* PrefixUnaryExpression */:
-                    if (valueExpression.operator !== 38 /* MinusToken */ || valueExpression.operand.kind !== 8 /* NumericLiteral */) {
-                        break; // not valid JSON syntax
-                    }
-                    reportInvalidOptionValue(option && option.type !== "number");
-                    return -Number(valueExpression.operand.text);
-                case 184 /* ObjectLiteralExpression */:
-                    reportInvalidOptionValue(option && option.type !== "object");
-                    var objectLiteralExpression = valueExpression;
-                    // Currently having element option declaration in the tsconfig with type "object"
-                    // determines if it needs onSetValidOptionKeyValueInParent callback or not
-                    // At moment there are only "compilerOptions", "typeAcquisition" and "typingOptions"
-                    // that satifies it and need it to modify options set in them (for normalizing file paths)
-                    // vs what we set in the json
-                    // If need arises, we can modify this interface and callbacks as needed
-                    if (option) {
-                        var _a = option, elementOptions = _a.elementOptions, extraKeyDiagnosticMessage = _a.extraKeyDiagnosticMessage, optionName = _a.name;
-                        return convertObjectLiteralExpressionToJson(objectLiteralExpression, elementOptions, extraKeyDiagnosticMessage, optionName);
-                    }
-                    else {
-                        return convertObjectLiteralExpressionToJson(objectLiteralExpression, /* knownOptions*/ undefined, 
-                        /*extraKeyDiagnosticMessage */ undefined, /*parentOption*/ undefined);
-                    }
-                case 183 /* ArrayLiteralExpression */:
-                    reportInvalidOptionValue(option && option.type !== "list");
-                    return convertArrayLiteralExpressionToJson(valueExpression.elements, option && option.element);
-            }
-            // Not in expected format
-            if (option) {
-                reportInvalidOptionValue(/*isError*/ true);
-            }
-            else {
-                errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, valueExpression, ts.Diagnostics.Property_value_can_only_be_string_literal_numeric_literal_true_false_null_object_literal_or_array_literal));
-            }
-            return undefined;
-            function reportInvalidOptionValue(isError) {
-                if (isError) {
-                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, valueExpression, ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, option.name, getCompilerOptionValueTypeString(option)));
-                }
-            }
-        }
-        function isDoubleQuotedString(node) {
-            return ts.isStringLiteral(node) && ts.isStringDoubleQuoted(node, sourceFile);
-        }
-    }
-    ts.convertToObjectWorker = convertToObjectWorker;
-    function getCompilerOptionValueTypeString(option) {
-        return option.type === "list" ?
-            "Array" :
-            ts.isString(option.type) ? option.type : "string";
-    }
-    function isCompilerOptionsValue(option, value) {
-        if (option) {
-            if (isNullOrUndefined(value))
-                return true; // All options are undefinable/nullable
-            if (option.type === "list") {
-                return ts.isArray(value);
-            }
-            var expectedType = ts.isString(option.type) ? option.type : "string";
-            return typeof value === expectedType;
-        }
-        return false;
-    }
-    /**
-     * Generate tsconfig configuration when running command line "--init"
-     * @param options commandlineOptions to be generated into tsconfig.json
-     * @param fileNames array of filenames to be generated into tsconfig.json
-     */
-    /* @internal */
-    function generateTSConfig(options, fileNames, newLine) {
-        var compilerOptions = ts.extend(options, ts.defaultInitCompilerOptions);
-        var compilerOptionsMap = serializeCompilerOptions(compilerOptions);
-        return writeConfigurations();
-        function getCustomTypeMapOfCommandLineOption(optionDefinition) {
-            if (optionDefinition.type === "string" || optionDefinition.type === "number" || optionDefinition.type === "boolean") {
-                // this is of a type CommandLineOptionOfPrimitiveType
-                return undefined;
-            }
-            else if (optionDefinition.type === "list") {
-                return getCustomTypeMapOfCommandLineOption(optionDefinition.element);
-            }
-            else {
-                return optionDefinition.type;
-            }
-        }
-        function getNameOfCompilerOptionValue(value, customTypeMap) {
-            // There is a typeMap associated with this command-line option so use it to map value back to its name
-            return ts.forEachEntry(customTypeMap, function (mapValue, key) {
-                if (mapValue === value) {
-                    return key;
-                }
-            });
-        }
-        function serializeCompilerOptions(options) {
-            var result = ts.createMap();
-            var optionsNameMap = getOptionNameMap().optionNameMap;
-            var _loop_11 = function (name) {
-                if (ts.hasProperty(options, name)) {
-                    // tsconfig only options cannot be specified via command line,
-                    // so we can assume that only types that can appear here string | number | boolean
-                    if (optionsNameMap.has(name) && optionsNameMap.get(name).category === ts.Diagnostics.Command_line_Options) {
-                        return "continue";
-                    }
-                    var value = options[name];
-                    var optionDefinition = optionsNameMap.get(name.toLowerCase());
-                    if (optionDefinition) {
-                        var customTypeMap_1 = getCustomTypeMapOfCommandLineOption(optionDefinition);
-                        if (!customTypeMap_1) {
-                            // There is no map associated with this compiler option then use the value as-is
-                            // This is the case if the value is expect to be string, number, boolean or list of string
-                            result.set(name, value);
-                        }
-                        else {
-                            if (optionDefinition.type === "list") {
-                                result.set(name, value.map(function (element) { return getNameOfCompilerOptionValue(element, customTypeMap_1); })); // TODO: GH#18217
-                            }
-                            else {
-                                // There is a typeMap associated with this command-line option so use it to map value back to its name
-                                result.set(name, getNameOfCompilerOptionValue(value, customTypeMap_1));
-                            }
-                        }
-                    }
-                }
-            };
-            for (var name in options) {
-                _loop_11(name);
-            }
-            return result;
-        }
-        function getDefaultValueForOption(option) {
-            switch (option.type) {
-                case "number":
-                    return 1;
-                case "boolean":
-                    return true;
-                case "string":
-                    return option.isFilePath ? "./" : "";
-                case "list":
-                    return [];
-                case "object":
-                    return {};
-                default:
-                    return option.type.keys().next().value;
-            }
-        }
-        function makePadding(paddingLength) {
-            return Array(paddingLength + 1).join(" ");
-        }
-        function isAllowedOption(_a) {
-            var category = _a.category, name = _a.name;
-            // Skip options which do not have a category or have category `Command_line_Options`
-            // Exclude all possible `Advanced_Options` in tsconfig.json which were NOT defined in command line
-            return category !== undefined
-                && category !== ts.Diagnostics.Command_line_Options
-                && (category !== ts.Diagnostics.Advanced_Options || compilerOptionsMap.has(name));
-        }
-        function writeConfigurations() {
-            // Filter applicable options to place in the file
-            var categorizedOptions = ts.createMultiMap();
-            for (var _i = 0, optionDeclarations_1 = ts.optionDeclarations; _i < optionDeclarations_1.length; _i++) {
-                var option = optionDeclarations_1[_i];
-                var category = option.category;
-                if (isAllowedOption(option)) {
-                    categorizedOptions.add(ts.getLocaleSpecificMessage(category), option);
-                }
-            }
-            // Serialize all options and their descriptions
-            var marginLength = 0;
-            var seenKnownKeys = 0;
-            var nameColumn = [];
-            var descriptionColumn = [];
-            categorizedOptions.forEach(function (options, category) {
-                if (nameColumn.length !== 0) {
-                    nameColumn.push("");
-                    descriptionColumn.push("");
-                }
-                nameColumn.push("/* " + category + " */");
-                descriptionColumn.push("");
-                for (var _i = 0, options_1 = options; _i < options_1.length; _i++) {
-                    var option = options_1[_i];
-                    var optionName = void 0;
-                    if (compilerOptionsMap.has(option.name)) {
-                        optionName = "\"" + option.name + "\": " + JSON.stringify(compilerOptionsMap.get(option.name)) + ((seenKnownKeys += 1) === compilerOptionsMap.size ? "" : ",");
-                    }
-                    else {
-                        optionName = "// \"" + option.name + "\": " + JSON.stringify(getDefaultValueForOption(option)) + ",";
-                    }
-                    nameColumn.push(optionName);
-                    descriptionColumn.push("/* " + (option.description && ts.getLocaleSpecificMessage(option.description) || option.name) + " */");
-                    marginLength = Math.max(optionName.length, marginLength);
-                }
-            });
-            // Write the output
-            var tab = makePadding(2);
-            var result = [];
-            result.push("{");
-            result.push(tab + "\"compilerOptions\": {");
-            // Print out each row, aligning all the descriptions on the same column.
-            for (var i = 0; i < nameColumn.length; i++) {
-                var optionName = nameColumn[i];
-                var description = descriptionColumn[i];
-                result.push(optionName && "" + tab + tab + optionName + (description && (makePadding(marginLength - optionName.length + 2) + description)));
-            }
-            if (fileNames.length) {
-                result.push(tab + "},");
-                result.push(tab + "\"files\": [");
-                for (var i = 0; i < fileNames.length; i++) {
-                    result.push("" + tab + tab + JSON.stringify(fileNames[i]) + (i === fileNames.length - 1 ? "" : ","));
-                }
-                result.push(tab + "]");
-            }
-            else {
-                result.push(tab + "}");
-            }
-            result.push("}");
-            return result.join(newLine);
-        }
-    }
-    ts.generateTSConfig = generateTSConfig;
-    /**
-     * Parse the contents of a config file (tsconfig.json).
-     * @param json The contents of the config file to parse
-     * @param host Instance of ParseConfigHost used to enumerate files in folder.
-     * @param basePath A root directory to resolve relative path entries in the config
-     *    file to. e.g. outDir
-     */
-    function parseJsonConfigFileContent(json, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions) {
-        return parseJsonConfigFileContentWorker(json, /*sourceFile*/ undefined, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions);
-    }
-    ts.parseJsonConfigFileContent = parseJsonConfigFileContent;
-    /**
-     * Parse the contents of a config file (tsconfig.json).
-     * @param jsonNode The contents of the config file to parse
-     * @param host Instance of ParseConfigHost used to enumerate files in folder.
-     * @param basePath A root directory to resolve relative path entries in the config
-     *    file to. e.g. outDir
-     */
-    function parseJsonSourceFileConfigFileContent(sourceFile, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions) {
-        return parseJsonConfigFileContentWorker(/*json*/ undefined, sourceFile, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions);
-    }
-    ts.parseJsonSourceFileConfigFileContent = parseJsonSourceFileConfigFileContent;
-    /*@internal*/
-    function setConfigFileInOptions(options, configFile) {
-        if (configFile) {
-            Object.defineProperty(options, "configFile", { enumerable: false, writable: false, value: configFile });
-        }
-    }
-    ts.setConfigFileInOptions = setConfigFileInOptions;
-    function isNullOrUndefined(x) {
-        // tslint:disable-next-line:no-null-keyword
-        return x === undefined || x === null;
-    }
-    function directoryOfCombinedPath(fileName, basePath) {
-        // Use the `getNormalizedAbsolutePath` function to avoid canonicalizing the path, as it must remain noncanonical
-        // until consistient casing errors are reported
-        return ts.getDirectoryPath(ts.getNormalizedAbsolutePath(fileName, basePath));
-    }
-    /**
-     * Parse the contents of a config file from json or json source file (tsconfig.json).
-     * @param json The contents of the config file to parse
-     * @param sourceFile sourceFile corresponding to the Json
-     * @param host Instance of ParseConfigHost used to enumerate files in folder.
-     * @param basePath A root directory to resolve relative path entries in the config
-     *    file to. e.g. outDir
-     * @param resolutionStack Only present for backwards-compatibility. Should be empty.
-     */
-    function parseJsonConfigFileContentWorker(json, sourceFile, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions) {
-        if (existingOptions === void 0) { existingOptions = {}; }
-        if (resolutionStack === void 0) { resolutionStack = []; }
-        if (extraFileExtensions === void 0) { extraFileExtensions = []; }
-        ts.Debug.assert((json === undefined && sourceFile !== undefined) || (json !== undefined && sourceFile === undefined));
-        var errors = [];
-        var parsedConfig = parseConfig(json, sourceFile, host, basePath, configFileName, resolutionStack, errors);
-        var raw = parsedConfig.raw;
-        var options = ts.extend(existingOptions, parsedConfig.options || {});
-        options.configFilePath = configFileName && ts.normalizeSlashes(configFileName);
-        setConfigFileInOptions(options, sourceFile);
-        var _a = getFileNames(), fileNames = _a.fileNames, wildcardDirectories = _a.wildcardDirectories, spec = _a.spec, projectReferences = _a.projectReferences;
-        return {
-            options: options,
-            fileNames: fileNames,
-            projectReferences: projectReferences,
-            typeAcquisition: parsedConfig.typeAcquisition || getDefaultTypeAcquisition(),
-            raw: raw,
-            errors: errors,
-            wildcardDirectories: wildcardDirectories,
-            compileOnSave: !!raw.compileOnSave,
-            configFileSpecs: spec
-        };
-        function getFileNames() {
-            var filesSpecs;
-            if (ts.hasProperty(raw, "files") && !isNullOrUndefined(raw.files)) {
-                if (ts.isArray(raw.files)) {
-                    filesSpecs = raw.files;
-                    if (filesSpecs.length === 0) {
-                        createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.The_files_list_in_config_file_0_is_empty, configFileName || "tsconfig.json");
-                    }
-                }
-                else {
-                    createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "files", "Array");
-                }
-            }
-            var includeSpecs;
-            if (ts.hasProperty(raw, "include") && !isNullOrUndefined(raw.include)) {
-                if (ts.isArray(raw.include)) {
-                    includeSpecs = raw.include;
-                }
-                else {
-                    createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "include", "Array");
-                }
-            }
-            var excludeSpecs;
-            if (ts.hasProperty(raw, "exclude") && !isNullOrUndefined(raw.exclude)) {
-                if (ts.isArray(raw.exclude)) {
-                    excludeSpecs = raw.exclude;
-                }
-                else {
-                    createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "exclude", "Array");
-                }
-            }
-            else if (raw.compilerOptions) {
-                var outDir = raw.compilerOptions.outDir;
-                var declarationDir = raw.compilerOptions.declarationDir;
-                if (outDir || declarationDir) {
-                    excludeSpecs = [outDir, declarationDir].filter(function (d) { return !!d; });
-                }
-            }
-            if (filesSpecs === undefined && includeSpecs === undefined) {
-                includeSpecs = ["**/*"];
-            }
-            var result = matchFileNames(filesSpecs, includeSpecs, excludeSpecs, configFileName ? directoryOfCombinedPath(configFileName, basePath) : basePath, options, host, errors, extraFileExtensions, sourceFile);
-            if (result.fileNames.length === 0 && !ts.hasProperty(raw, "files") && resolutionStack.length === 0 && !ts.hasProperty(raw, "references")) {
-                errors.push(getErrorForNoInputFiles(result.spec, configFileName));
-            }
-            if (ts.hasProperty(raw, "references") && !isNullOrUndefined(raw.references)) {
-                if (ts.isArray(raw.references)) {
-                    var references = [];
-                    for (var _i = 0, _a = raw.references; _i < _a.length; _i++) {
-                        var ref = _a[_i];
-                        if (typeof ref.path !== "string") {
-                            createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "reference.path", "string");
-                        }
-                        else {
-                            references.push({
-                                path: ts.getNormalizedAbsolutePath(ref.path, basePath),
-                                originalPath: ref.path,
-                                prepend: ref.prepend,
-                                circular: ref.circular
-                            });
-                        }
-                    }
-                    result.projectReferences = references;
-                }
-                else {
-                    createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "references", "Array");
-                }
-            }
-            return result;
-        }
-        function createCompilerDiagnosticOnlyIfJson(message, arg0, arg1) {
-            if (!sourceFile) {
-                errors.push(ts.createCompilerDiagnostic(message, arg0, arg1));
-            }
-        }
-    }
-    /*@internal*/
-    function isErrorNoInputFiles(error) {
-        return error.code === ts.Diagnostics.No_inputs_were_found_in_config_file_0_Specified_include_paths_were_1_and_exclude_paths_were_2.code;
-    }
-    ts.isErrorNoInputFiles = isErrorNoInputFiles;
-    /*@internal*/
-    function getErrorForNoInputFiles(_a, configFileName) {
-        var includeSpecs = _a.includeSpecs, excludeSpecs = _a.excludeSpecs;
-        return ts.createCompilerDiagnostic(ts.Diagnostics.No_inputs_were_found_in_config_file_0_Specified_include_paths_were_1_and_exclude_paths_were_2, configFileName || "tsconfig.json", JSON.stringify(includeSpecs || []), JSON.stringify(excludeSpecs || []));
-    }
-    ts.getErrorForNoInputFiles = getErrorForNoInputFiles;
-    function isSuccessfulParsedTsconfig(value) {
-        return !!value.options;
-    }
-    /**
-     * This *just* extracts options/include/exclude/files out of a config file.
-     * It does *not* resolve the included files.
-     */
-    function parseConfig(json, sourceFile, host, basePath, configFileName, resolutionStack, errors) {
-        basePath = ts.normalizeSlashes(basePath);
-        var resolvedPath = ts.getNormalizedAbsolutePath(configFileName || "", basePath);
-        if (resolutionStack.indexOf(resolvedPath) >= 0) {
-            errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Circularity_detected_while_resolving_configuration_Colon_0, resolutionStack.concat([resolvedPath]).join(" -> ")));
-            return { raw: json || convertToObject(sourceFile, errors) };
-        }
-        var ownConfig = json ?
-            parseOwnConfigOfJson(json, host, basePath, configFileName, errors) :
-            parseOwnConfigOfJsonSourceFile(sourceFile, host, basePath, configFileName, errors);
-        if (ownConfig.extendedConfigPath) {
-            // copy the resolution stack so it is never reused between branches in potential diamond-problem scenarios.
-            resolutionStack = resolutionStack.concat([resolvedPath]);
-            var extendedConfig = getExtendedConfig(sourceFile, ownConfig.extendedConfigPath, host, basePath, resolutionStack, errors);
-            if (extendedConfig && isSuccessfulParsedTsconfig(extendedConfig)) {
-                var baseRaw_1 = extendedConfig.raw;
-                var raw_1 = ownConfig.raw;
-                var setPropertyInRawIfNotUndefined = function (propertyName) {
-                    var value = raw_1[propertyName] || baseRaw_1[propertyName];
-                    if (value) {
-                        raw_1[propertyName] = value;
-                    }
-                };
-                setPropertyInRawIfNotUndefined("include");
-                setPropertyInRawIfNotUndefined("exclude");
-                setPropertyInRawIfNotUndefined("files");
-                if (raw_1.compileOnSave === undefined) {
-                    raw_1.compileOnSave = baseRaw_1.compileOnSave;
-                }
-                ownConfig.options = ts.assign({}, extendedConfig.options, ownConfig.options);
-                // TODO extend type typeAcquisition
-            }
-        }
-        return ownConfig;
-    }
-    function parseOwnConfigOfJson(json, host, basePath, configFileName, errors) {
-        if (ts.hasProperty(json, "excludes")) {
-            errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Unknown_option_excludes_Did_you_mean_exclude));
-        }
-        var options = convertCompilerOptionsFromJsonWorker(json.compilerOptions, basePath, errors, configFileName);
-        // typingOptions has been deprecated and is only supported for backward compatibility purposes.
-        // It should be removed in future releases - use typeAcquisition instead.
-        var typeAcquisition = convertTypeAcquisitionFromJsonWorker(json.typeAcquisition || json.typingOptions, basePath, errors, configFileName);
-        json.compileOnSave = convertCompileOnSaveOptionFromJson(json, basePath, errors);
-        var extendedConfigPath;
-        if (json.extends) {
-            if (!ts.isString(json.extends)) {
-                errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "extends", "string"));
-            }
-            else {
-                var newBase = configFileName ? directoryOfCombinedPath(configFileName, basePath) : basePath;
-                extendedConfigPath = getExtendsConfigPath(json.extends, host, newBase, errors, ts.createCompilerDiagnostic);
-            }
-        }
-        return { raw: json, options: options, typeAcquisition: typeAcquisition, extendedConfigPath: extendedConfigPath };
-    }
-    function parseOwnConfigOfJsonSourceFile(sourceFile, host, basePath, configFileName, errors) {
-        var options = getDefaultCompilerOptions(configFileName);
-        var typeAcquisition, typingOptionstypeAcquisition;
-        var extendedConfigPath;
-        var optionsIterator = {
-            onSetValidOptionKeyValueInParent: function (parentOption, option, value) {
-                ts.Debug.assert(parentOption === "compilerOptions" || parentOption === "typeAcquisition" || parentOption === "typingOptions");
-                var currentOption = parentOption === "compilerOptions" ?
-                    options :
-                    parentOption === "typeAcquisition" ?
-                        (typeAcquisition || (typeAcquisition = getDefaultTypeAcquisition(configFileName))) :
-                        (typingOptionstypeAcquisition || (typingOptionstypeAcquisition = getDefaultTypeAcquisition(configFileName)));
-                currentOption[option.name] = normalizeOptionValue(option, basePath, value);
-            },
-            onSetValidOptionKeyValueInRoot: function (key, _keyNode, value, valueNode) {
-                switch (key) {
-                    case "extends":
-                        var newBase = configFileName ? directoryOfCombinedPath(configFileName, basePath) : basePath;
-                        extendedConfigPath = getExtendsConfigPath(value, host, newBase, errors, function (message, arg0) {
-                            return ts.createDiagnosticForNodeInSourceFile(sourceFile, valueNode, message, arg0);
+            var _loop_9 = function (resolved) {
+                var cfg = configFileCache.parseConfigFile(resolved);
+                if (cfg) {
+                    // Watch this file
+                    system.watchFile(resolved, function () {
+                        configFileCache.removeKey(resolved);
+                        invalidateProjectAndScheduleBuilds(resolved);
+                    });
+                    // Update watchers for wildcard directories
+                    if (cfg.configFileSpecs) {
+                        ts.updateWatchingWildcardDirectories(existingWatchersForWildcards, ts.createMapFromTemplate(cfg.configFileSpecs.wildcardDirectories), function (dir, flags) {
+                            return system.watchDirectory(dir, function () {
+                                invalidateProjectAndScheduleBuilds(resolved);
+                            }, !!(flags & 1 /* Recursive */));
                         });
-                        return;
-                    case "files":
-                        if (value.length === 0) {
-                            errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, valueNode, ts.Diagnostics.The_files_list_in_config_file_0_is_empty, configFileName || "tsconfig.json"));
-                        }
-                        return;
+                    }
+                    // Watch input files
+                    for (var _i = 0, _a = cfg.fileNames; _i < _a.length; _i++) {
+                        var input = _a[_i];
+                        system.watchFile(input, function () {
+                            invalidateProjectAndScheduleBuilds(resolved);
+                        });
+                    }
                 }
-            },
-            onSetUnknownOptionKeyValueInRoot: function (key, keyNode, _value, _valueNode) {
-                if (key === "excludes") {
-                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, keyNode, ts.Diagnostics.Unknown_option_excludes_Did_you_mean_exclude));
+            };
+            for (var _i = 0, _a = graph.buildQueue; _i < _a.length; _i++) {
+                var resolved = _a[_i];
+                _loop_9(resolved);
+            }
+            function invalidateProjectAndScheduleBuilds(resolved) {
+                invalidateProject(resolved);
+                system.setTimeout(buildInvalidatedProjects, 100);
+                system.setTimeout(buildDependentInvalidatedProjects, 3000);
+            }
+        }
+        function resetBuildContext(opts) {
+            if (opts === void 0) { opts = defaultOptions; }
+            context = createBuildContext(opts);
+        }
+        function getUpToDateStatusOfFile(configFileName) {
+            return getUpToDateStatus(configFileCache.parseConfigFile(configFileName));
+        }
+        function getBuildGraph(configFileNames) {
+            var resolvedNames = resolveProjectNames(configFileNames);
+            if (resolvedNames === undefined)
+                return undefined;
+            return createDependencyGraph(resolvedNames);
+        }
+        function getGlobalDependencyGraph() {
+            return getBuildGraph(rootNames);
+        }
+        function getUpToDateStatus(project) {
+            if (project === undefined) {
+                return { type: UpToDateStatusType.Unbuildable, reason: "File deleted mid-build" };
+            }
+            var prior = context.projectStatus.getValueOrUndefined(project.options.configFilePath);
+            if (prior !== undefined) {
+                return prior;
+            }
+            var actual = getUpToDateStatusWorker(project);
+            context.projectStatus.setValue(project.options.configFilePath, actual);
+            return actual;
+        }
+        function invalidateProject(configFileName) {
+            var resolved = resolveProjectName(configFileName);
+            if (resolved === undefined) {
+                // If this was a rootName, we need to track it as missing.
+                // Otherwise we can just ignore it and have it possibly surface as an error in any downstream projects,
+                // if they exist
+                // TODO: do those things
+                return;
+            }
+            configFileCache.removeKey(resolved);
+            context.invalidatedProjects.setValue(resolved, true);
+            context.projectStatus.removeKey(resolved);
+            var graph = getGlobalDependencyGraph();
+            if (graph) {
+                queueBuildForDownstreamReferences(resolved);
+            }
+            // Mark all downstream projects of this one needing to be built "later"
+            function queueBuildForDownstreamReferences(root) {
+                debugger;
+                var deps = graph.dependencyMap.getReferencesTo(root);
+                for (var _i = 0, deps_1 = deps; _i < deps_1.length; _i++) {
+                    var ref = deps_1[_i];
+                    // Can skip circular references
+                    if (!context.queuedProjects.hasKey(ref)) {
+                        context.queuedProjects.setValue(ref, true);
+                        queueBuildForDownstreamReferences(ref);
+                    }
                 }
             }
-        };
-        var json = convertToObjectWorker(sourceFile, errors, /*returnValue*/ true, getTsconfigRootOptionsMap(), optionsIterator);
-        if (!typeAcquisition) {
-            if (typingOptionstypeAcquisition) {
-                typeAcquisition = (typingOptionstypeAcquisition.enableAutoDiscovery !== undefined) ?
-                    {
-                        enable: typingOptionstypeAcquisition.enableAutoDiscovery,
-                        include: typingOptionstypeAcquisition.include,
-                        exclude: typingOptionstypeAcquisition.exclude
-                    } :
-                    typingOptionstypeAcquisition;
+        }
+        function buildInvalidatedProjects() {
+            buildSomeProjects(function (p) { return context.invalidatedProjects.hasKey(p); });
+        }
+        function buildDependentInvalidatedProjects() {
+            buildSomeProjects(function (p) { return context.queuedProjects.hasKey(p); });
+        }
+        function buildSomeProjects(predicate) {
+            var resolvedNames = resolveProjectNames(rootNames);
+            if (resolvedNames === undefined)
+                return;
+            var graph = createDependencyGraph(resolvedNames);
+            for (var _i = 0, _a = graph.buildQueue; _i < _a.length; _i++) {
+                var next = _a[_i];
+                if (!predicate(next))
+                    continue;
+                var resolved = resolveProjectName(next);
+                if (!resolved)
+                    continue; // ??
+                var proj = configFileCache.parseConfigFile(resolved);
+                if (!proj)
+                    continue; // ?
+                var status = getUpToDateStatus(proj);
+                verboseReportProjectStatus(next, status);
+                if (status.type === UpToDateStatusType.UpstreamBlocked) {
+                    if (context.options.verbose)
+                        buildHost.verbose(ts.Diagnostics.Skipping_build_of_project_0_because_its_dependency_1_has_errors, resolved, status.upstreamProjectName);
+                    continue;
+                }
+                buildSingleProject(next);
+            }
+        }
+        function getAllProjectOutputs(project) {
+            if (project.options.outFile) {
+                return getOutFileOutputs(project);
             }
             else {
-                typeAcquisition = getDefaultTypeAcquisition(configFileName);
+                var outputs = [];
+                for (var _i = 0, _a = project.fileNames; _i < _a.length; _i++) {
+                    var inputFile = _a[_i];
+                    outputs.push.apply(outputs, getOutputFileNames(inputFile, project));
+                }
+                return outputs;
             }
         }
-        return { raw: json, options: options, typeAcquisition: typeAcquisition, extendedConfigPath: extendedConfigPath };
-    }
-    function getExtendsConfigPath(extendedConfig, host, basePath, errors, createDiagnostic) {
-        extendedConfig = ts.normalizeSlashes(extendedConfig);
-        // If the path isn't a rooted or relative path, don't try to resolve it (we reserve the right to special case module-id like paths in the future)
-        if (!(ts.isRootedDiskPath(extendedConfig) || ts.startsWith(extendedConfig, "./") || ts.startsWith(extendedConfig, "../"))) {
-            errors.push(createDiagnostic(ts.Diagnostics.A_path_in_an_extends_option_must_be_relative_or_rooted_but_0_is_not, extendedConfig));
-            return undefined;
+        function getUpToDateStatusWorker(project) {
+            var newestInputFileName = undefined;
+            var newestInputFileTime = minimumDate;
+            // Get timestamps of input files
+            for (var _i = 0, _a = project.fileNames; _i < _a.length; _i++) {
+                var inputFile = _a[_i];
+                if (!compilerHost.fileExists(inputFile)) {
+                    return {
+                        type: UpToDateStatusType.Unbuildable,
+                        reason: inputFile + " does not exist"
+                    };
+                }
+                var inputTime = compilerHost.getModifiedTime(inputFile);
+                if (inputTime > newestInputFileTime) {
+                    newestInputFileName = inputFile;
+                    newestInputFileTime = inputTime;
+                }
+            }
+            // Collect the expected outputs of this project
+            var outputs = getAllProjectOutputs(project);
+            if (outputs.length === 0) {
+                return {
+                    type: UpToDateStatusType.ContainerOnly
+                };
+            }
+            // Now see if all outputs are newer than the newest input
+            var oldestOutputFileName = "(none)";
+            var oldestOutputFileTime = maximumDate;
+            var newestOutputFileName = "(none)";
+            var newestOutputFileTime = minimumDate;
+            var missingOutputFileName;
+            var newestDeclarationFileContentChangedTime = minimumDate;
+            var isOutOfDateWithInputs = false;
+            for (var _b = 0, outputs_1 = outputs; _b < outputs_1.length; _b++) {
+                var output = outputs_1[_b];
+                // Output is missing; can stop checking
+                // Don't immediately return because we can still be upstream-blocked, which is a higher-priority status
+                if (!compilerHost.fileExists(output)) {
+                    missingOutputFileName = output;
+                    break;
+                }
+                var outputTime = compilerHost.getModifiedTime(output);
+                if (outputTime < oldestOutputFileTime) {
+                    oldestOutputFileTime = outputTime;
+                    oldestOutputFileName = output;
+                }
+                // If an output is older than the newest input, we can stop checking
+                // Don't immediately return because we can still be upstream-blocked, which is a higher-priority status
+                if (outputTime < newestInputFileTime) {
+                    isOutOfDateWithInputs = true;
+                    break;
+                }
+                if (outputTime > newestOutputFileTime) {
+                    newestOutputFileTime = outputTime;
+                    newestOutputFileName = output;
+                }
+                // Keep track of when the most recent time a .d.ts file was changed.
+                // In addition to file timestamps, we also keep track of when a .d.ts file
+                // had its file touched but not had its contents changed - this allows us
+                // to skip a downstream typecheck
+                if (isDeclarationFile(output)) {
+                    var unchangedTime = context.unchangedOutputs.getValueOrUndefined(output);
+                    if (unchangedTime !== undefined) {
+                        newestDeclarationFileContentChangedTime = newer(unchangedTime, newestDeclarationFileContentChangedTime);
+                    }
+                    else {
+                        newestDeclarationFileContentChangedTime = newer(newestDeclarationFileContentChangedTime, compilerHost.getModifiedTime(output));
+                    }
+                }
+            }
+            var pseudoUpToDate = false;
+            if (project.projectReferences) {
+                for (var _c = 0, _d = project.projectReferences; _c < _d.length; _c++) {
+                    var ref = _d[_c];
+                    var resolvedRef = ts.resolveProjectReferencePath(compilerHost, ref);
+                    var refStatus = getUpToDateStatus(configFileCache.parseConfigFile(resolvedRef));
+                    // An upstream project is blocked
+                    if (refStatus.type === UpToDateStatusType.Unbuildable) {
+                        return {
+                            type: UpToDateStatusType.UpstreamBlocked,
+                            upstreamProjectName: ref.path
+                        };
+                    }
+                    // If the upstream project is out of date, then so are we (someone shouldn't have asked, though?)
+                    if (refStatus.type !== UpToDateStatusType.UpToDate) {
+                        return {
+                            type: UpToDateStatusType.UpstreamOutOfDate,
+                            upstreamProjectName: ref.path
+                        };
+                    }
+                    // If the upstream project's newest file is older than our oldest output, we
+                    // can't be out of date because of it
+                    if (refStatus.newestInputFileTime <= oldestOutputFileTime) {
+                        continue;
+                    }
+                    // If the upstream project has only change .d.ts files, and we've built
+                    // *after* those files, then we're "psuedo up to date" and eligible for a fast rebuild
+                    if (refStatus.newestDeclarationFileContentChangedTime <= oldestOutputFileTime) {
+                        pseudoUpToDate = true;
+                        continue;
+                    }
+                    // We have an output older than an upstream output - we are out of date
+                    ts.Debug.assert(oldestOutputFileName !== undefined, "Should have an oldest output filename here");
+                    return {
+                        type: UpToDateStatusType.OutOfDateWithUpstream,
+                        outOfDateOutputFileName: oldestOutputFileName,
+                        newerProjectName: ref.path
+                    };
+                }
+            }
+            if (missingOutputFileName !== undefined) {
+                return {
+                    type: UpToDateStatusType.OutputMissing,
+                    missingOutputFileName: missingOutputFileName
+                };
+            }
+            if (isOutOfDateWithInputs) {
+                return {
+                    type: UpToDateStatusType.OutOfDateWithSelf,
+                    outOfDateOutputFileName: oldestOutputFileName,
+                    newerInputFileName: newestInputFileName
+                };
+            }
+            // Up to date
+            return {
+                type: pseudoUpToDate ? UpToDateStatusType.UpToDateWithUpstreamTypes : UpToDateStatusType.UpToDate,
+                newestDeclarationFileContentChangedTime: newestDeclarationFileContentChangedTime,
+                newestInputFileTime: newestInputFileTime,
+                newestOutputFileTime: newestOutputFileTime,
+                newestInputFileName: newestInputFileName,
+                newestOutputFileName: newestOutputFileName,
+                oldestOutputFileName: oldestOutputFileName
+            };
         }
-        var extendedConfigPath = ts.getNormalizedAbsolutePath(extendedConfig, basePath);
-        if (!host.fileExists(extendedConfigPath) && !ts.endsWith(extendedConfigPath, ".json" /* Json */)) {
-            extendedConfigPath = extendedConfigPath + ".json";
-            if (!host.fileExists(extendedConfigPath)) {
-                errors.push(createDiagnostic(ts.Diagnostics.File_0_does_not_exist, extendedConfig));
+        function createDependencyGraph(roots) {
+            var temporaryMarks = {};
+            var permanentMarks = {};
+            var circularityReportStack = [];
+            var buildOrder = [];
+            var graph = createDependencyMapper();
+            var hadError = false;
+            for (var _i = 0, roots_1 = roots; _i < roots_1.length; _i++) {
+                var root = roots_1[_i];
+                visit(root);
+            }
+            if (hadError) {
                 return undefined;
             }
-        }
-        return extendedConfigPath;
-    }
-    function getExtendedConfig(sourceFile, extendedConfigPath, host, basePath, resolutionStack, errors) {
-        var _a;
-        var extendedResult = readJsonConfigFile(extendedConfigPath, function (path) { return host.readFile(path); });
-        if (sourceFile) {
-            (sourceFile.extendedSourceFiles || (sourceFile.extendedSourceFiles = [])).push(extendedResult.fileName);
-        }
-        if (extendedResult.parseDiagnostics.length) {
-            errors.push.apply(errors, extendedResult.parseDiagnostics);
-            return undefined;
-        }
-        var extendedDirname = ts.getDirectoryPath(extendedConfigPath);
-        var extendedConfig = parseConfig(/*json*/ undefined, extendedResult, host, extendedDirname, ts.getBaseFileName(extendedConfigPath), resolutionStack, errors);
-        if (sourceFile) {
-            (_a = sourceFile.extendedSourceFiles).push.apply(_a, extendedResult.extendedSourceFiles);
-        }
-        if (isSuccessfulParsedTsconfig(extendedConfig)) {
-            // Update the paths to reflect base path
-            var relativeDifference_1 = ts.convertToRelativePath(extendedDirname, basePath, ts.identity);
-            var updatePath_1 = function (path) { return ts.isRootedDiskPath(path) ? path : ts.combinePaths(relativeDifference_1, path); };
-            var mapPropertiesInRawIfNotUndefined = function (propertyName) {
-                if (raw_2[propertyName]) {
-                    raw_2[propertyName] = ts.map(raw_2[propertyName], updatePath_1);
-                }
-            };
-            var raw_2 = extendedConfig.raw;
-            mapPropertiesInRawIfNotUndefined("include");
-            mapPropertiesInRawIfNotUndefined("exclude");
-            mapPropertiesInRawIfNotUndefined("files");
-        }
-        return extendedConfig;
-    }
-    function convertCompileOnSaveOptionFromJson(jsonOption, basePath, errors) {
-        if (!ts.hasProperty(jsonOption, ts.compileOnSaveCommandLineOption.name)) {
-            return false;
-        }
-        var result = convertJsonOption(ts.compileOnSaveCommandLineOption, jsonOption.compileOnSave, basePath, errors);
-        return typeof result === "boolean" && result;
-    }
-    function convertCompilerOptionsFromJson(jsonOptions, basePath, configFileName) {
-        var errors = [];
-        var options = convertCompilerOptionsFromJsonWorker(jsonOptions, basePath, errors, configFileName);
-        return { options: options, errors: errors };
-    }
-    ts.convertCompilerOptionsFromJson = convertCompilerOptionsFromJson;
-    function convertTypeAcquisitionFromJson(jsonOptions, basePath, configFileName) {
-        var errors = [];
-        var options = convertTypeAcquisitionFromJsonWorker(jsonOptions, basePath, errors, configFileName);
-        return { options: options, errors: errors };
-    }
-    ts.convertTypeAcquisitionFromJson = convertTypeAcquisitionFromJson;
-    function getDefaultCompilerOptions(configFileName) {
-        var options = configFileName && ts.getBaseFileName(configFileName) === "jsconfig.json"
-            ? { allowJs: true, maxNodeModuleJsDepth: 2, allowSyntheticDefaultImports: true, skipLibCheck: true, noEmit: true }
-            : {};
-        return options;
-    }
-    function convertCompilerOptionsFromJsonWorker(jsonOptions, basePath, errors, configFileName) {
-        var options = getDefaultCompilerOptions(configFileName);
-        convertOptionsFromJson(ts.optionDeclarations, jsonOptions, basePath, options, ts.Diagnostics.Unknown_compiler_option_0, errors);
-        if (configFileName) {
-            options.configFilePath = ts.normalizeSlashes(configFileName);
-        }
-        return options;
-    }
-    function getDefaultTypeAcquisition(configFileName) {
-        return { enable: !!configFileName && ts.getBaseFileName(configFileName) === "jsconfig.json", include: [], exclude: [] };
-    }
-    function convertTypeAcquisitionFromJsonWorker(jsonOptions, basePath, errors, configFileName) {
-        var options = getDefaultTypeAcquisition(configFileName);
-        var typeAcquisition = convertEnableAutoDiscoveryToEnable(jsonOptions);
-        convertOptionsFromJson(ts.typeAcquisitionDeclarations, typeAcquisition, basePath, options, ts.Diagnostics.Unknown_type_acquisition_option_0, errors);
-        return options;
-    }
-    function convertOptionsFromJson(optionDeclarations, jsonOptions, basePath, defaultOptions, diagnosticMessage, errors) {
-        if (!jsonOptions) {
-            return;
-        }
-        var optionNameMap = commandLineOptionsToMap(optionDeclarations);
-        for (var id in jsonOptions) {
-            var opt = optionNameMap.get(id);
-            if (opt) {
-                defaultOptions[opt.name] = convertJsonOption(opt, jsonOptions[id], basePath, errors);
-            }
-            else {
-                errors.push(ts.createCompilerDiagnostic(diagnosticMessage, id));
-            }
-        }
-    }
-    function convertJsonOption(opt, value, basePath, errors) {
-        if (isCompilerOptionsValue(opt, value)) {
-            var optType = opt.type;
-            if (optType === "list" && ts.isArray(value)) {
-                return convertJsonOptionOfListType(opt, value, basePath, errors);
-            }
-            else if (!ts.isString(optType)) {
-                return convertJsonOptionOfCustomType(opt, value, errors);
-            }
-            return normalizeNonListOptionValue(opt, basePath, value);
-        }
-        else {
-            errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, opt.name, getCompilerOptionValueTypeString(opt)));
-        }
-    }
-    function normalizeOptionValue(option, basePath, value) {
-        if (isNullOrUndefined(value))
-            return undefined;
-        if (option.type === "list") {
-            var listOption_1 = option;
-            if (listOption_1.element.isFilePath || !ts.isString(listOption_1.element.type)) {
-                return ts.filter(ts.map(value, function (v) { return normalizeOptionValue(listOption_1.element, basePath, v); }), function (v) { return !!v; });
-            }
-            return value;
-        }
-        else if (!ts.isString(option.type)) {
-            return option.type.get(ts.isString(value) ? value.toLowerCase() : value);
-        }
-        return normalizeNonListOptionValue(option, basePath, value);
-    }
-    function normalizeNonListOptionValue(option, basePath, value) {
-        if (option.isFilePath) {
-            value = ts.normalizePath(ts.combinePaths(basePath, value));
-            if (value === "") {
-                value = ".";
-            }
-        }
-        return value;
-    }
-    function convertJsonOptionOfCustomType(opt, value, errors) {
-        if (isNullOrUndefined(value))
-            return undefined;
-        var key = value.toLowerCase();
-        var val = opt.type.get(key);
-        if (val !== undefined) {
-            return val;
-        }
-        else {
-            errors.push(createCompilerDiagnosticForInvalidCustomType(opt));
-        }
-    }
-    function convertJsonOptionOfListType(option, values, basePath, errors) {
-        return ts.filter(ts.map(values, function (v) { return convertJsonOption(option.element, v, basePath, errors); }), function (v) { return !!v; });
-    }
-    function trimString(s) {
-        return typeof s.trim === "function" ? s.trim() : s.replace(/^[\s]+|[\s]+$/g, "");
-    }
-    /**
-     * Tests for a path that ends in a recursive directory wildcard.
-     * Matches **, \**, **\, and \**\, but not a**b.
-     *
-     * NOTE: used \ in place of / above to avoid issues with multiline comments.
-     *
-     * Breakdown:
-     *  (^|\/)      # matches either the beginning of the string or a directory separator.
-     *  \*\*        # matches the recursive directory wildcard "**".
-     *  \/?$        # matches an optional trailing directory separator at the end of the string.
-     */
-    var invalidTrailingRecursionPattern = /(^|\/)\*\*\/?$/;
-    /**
-     * Tests for a path where .. appears after a recursive directory wildcard.
-     * Matches **\..\*, **\a\..\*, and **\.., but not ..\**\*
-     *
-     * NOTE: used \ in place of / above to avoid issues with multiline comments.
-     *
-     * Breakdown:
-     *  (^|\/)      # matches either the beginning of the string or a directory separator.
-     *  \*\*\/      # matches a recursive directory wildcard "**" followed by a directory separator.
-     *  (.*\/)?     # optionally matches any number of characters followed by a directory separator.
-     *  \.\.        # matches a parent directory path component ".."
-     *  ($|\/)      # matches either the end of the string or a directory separator.
-     */
-    var invalidDotDotAfterRecursiveWildcardPattern = /(^|\/)\*\*\/(.*\/)?\.\.($|\/)/;
-    /**
-     * Tests for a path containing a wildcard character in a directory component of the path.
-     * Matches \*\, \?\, and \a*b\, but not \a\ or \a\*.
-     *
-     * NOTE: used \ in place of / above to avoid issues with multiline comments.
-     *
-     * Breakdown:
-     *  \/          # matches a directory separator.
-     *  [^/]*?      # matches any number of characters excluding directory separators (non-greedy).
-     *  [*?]        # matches either a wildcard character (* or ?)
-     *  [^/]*       # matches any number of characters excluding directory separators (greedy).
-     *  \/          # matches a directory separator.
-     */
-    var watchRecursivePattern = /\/[^/]*?[*?][^/]*\//;
-    /**
-     * Matches the portion of a wildcard path that does not contain wildcards.
-     * Matches \a of \a\*, or \a\b\c of \a\b\c\?\d.
-     *
-     * NOTE: used \ in place of / above to avoid issues with multiline comments.
-     *
-     * Breakdown:
-     *  ^                   # matches the beginning of the string
-     *  [^*?]*              # matches any number of non-wildcard characters
-     *  (?=\/[^/]*[*?])     # lookahead that matches a directory separator followed by
-     *                      # a path component that contains at least one wildcard character (* or ?).
-     */
-    var wildcardDirectoryPattern = /^[^*?]*(?=\/[^/]*[*?])/;
-    /**
-     * Expands an array of file specifications.
-     *
-     * @param filesSpecs The literal file names to include.
-     * @param includeSpecs The wildcard file specifications to include.
-     * @param excludeSpecs The wildcard file specifications to exclude.
-     * @param basePath The base path for any relative file specifications.
-     * @param options Compiler options.
-     * @param host The host used to resolve files and directories.
-     * @param errors An array for diagnostic reporting.
-     */
-    function matchFileNames(filesSpecs, includeSpecs, excludeSpecs, basePath, options, host, errors, extraFileExtensions, jsonSourceFile) {
-        basePath = ts.normalizePath(basePath);
-        var validatedIncludeSpecs, validatedExcludeSpecs;
-        // The exclude spec list is converted into a regular expression, which allows us to quickly
-        // test whether a file or directory should be excluded before recursively traversing the
-        // file system.
-        if (includeSpecs) {
-            validatedIncludeSpecs = validateSpecs(includeSpecs, errors, /*allowTrailingRecursion*/ false, jsonSourceFile, "include");
-        }
-        if (excludeSpecs) {
-            validatedExcludeSpecs = validateSpecs(excludeSpecs, errors, /*allowTrailingRecursion*/ true, jsonSourceFile, "exclude");
-        }
-        // Wildcard directories (provided as part of a wildcard path) are stored in a
-        // file map that marks whether it was a regular wildcard match (with a `*` or `?` token),
-        // or a recursive directory. This information is used by filesystem watchers to monitor for
-        // new entries in these paths.
-        var wildcardDirectories = getWildcardDirectories(validatedIncludeSpecs, validatedExcludeSpecs, basePath, host.useCaseSensitiveFileNames);
-        var spec = { filesSpecs: filesSpecs, referencesSpecs: undefined, includeSpecs: includeSpecs, excludeSpecs: excludeSpecs, validatedIncludeSpecs: validatedIncludeSpecs, validatedExcludeSpecs: validatedExcludeSpecs, wildcardDirectories: wildcardDirectories };
-        return getFileNamesFromConfigSpecs(spec, basePath, options, host, extraFileExtensions);
-    }
-    /**
-     * Gets the file names from the provided config file specs that contain, files, include, exclude and
-     * other properties needed to resolve the file names
-     * @param spec The config file specs extracted with file names to include, wildcards to include/exclude and other details
-     * @param basePath The base path for any relative file specifications.
-     * @param options Compiler options.
-     * @param host The host used to resolve files and directories.
-     * @param extraFileExtensions optionaly file extra file extension information from host
-     */
-    /* @internal */
-    function getFileNamesFromConfigSpecs(spec, basePath, options, host, extraFileExtensions) {
-        if (extraFileExtensions === void 0) { extraFileExtensions = []; }
-        basePath = ts.normalizePath(basePath);
-        var keyMapper = host.useCaseSensitiveFileNames ? ts.identity : ts.toLowerCase;
-        // Literal file names (provided via the "files" array in tsconfig.json) are stored in a
-        // file map with a possibly case insensitive key. We use this map later when when including
-        // wildcard paths.
-        var literalFileMap = ts.createMap();
-        // Wildcard paths (provided via the "includes" array in tsconfig.json) are stored in a
-        // file map with a possibly case insensitive key. We use this map to store paths matched
-        // via wildcard, and to handle extension priority.
-        var wildcardFileMap = ts.createMap();
-        var filesSpecs = spec.filesSpecs, validatedIncludeSpecs = spec.validatedIncludeSpecs, validatedExcludeSpecs = spec.validatedExcludeSpecs, wildcardDirectories = spec.wildcardDirectories;
-        // Rather than requery this for each file and filespec, we query the supported extensions
-        // once and store it on the expansion context.
-        var supportedExtensions = ts.getSupportedExtensions(options, extraFileExtensions);
-        // Literal files are always included verbatim. An "include" or "exclude" specification cannot
-        // remove a literal file.
-        if (filesSpecs) {
-            for (var _i = 0, filesSpecs_1 = filesSpecs; _i < filesSpecs_1.length; _i++) {
-                var fileName = filesSpecs_1[_i];
-                var file_13 = ts.getNormalizedAbsolutePath(fileName, basePath);
-                literalFileMap.set(keyMapper(file_13), file_13);
-            }
-        }
-        if (validatedIncludeSpecs && validatedIncludeSpecs.length > 0) {
-            for (var _a = 0, _b = host.readDirectory(basePath, supportedExtensions, validatedExcludeSpecs, validatedIncludeSpecs, /*depth*/ undefined); _a < _b.length; _a++) {
-                var file_14 = _b[_a];
-                // If we have already included a literal or wildcard path with a
-                // higher priority extension, we should skip this file.
-                //
-                // This handles cases where we may encounter both <file>.ts and
-                // <file>.d.ts (or <file>.js if "allowJs" is enabled) in the same
-                // directory when they are compilation outputs.
-                if (hasFileWithHigherPriorityExtension(file_14, literalFileMap, wildcardFileMap, supportedExtensions, keyMapper)) {
-                    continue;
-                }
-                // We may have included a wildcard path with a lower priority
-                // extension due to the user-defined order of entries in the
-                // "include" array. If there is a lower priority extension in the
-                // same directory, we should remove it.
-                removeWildcardFilesWithLowerPriorityExtension(file_14, wildcardFileMap, supportedExtensions, keyMapper);
-                var key = keyMapper(file_14);
-                if (!literalFileMap.has(key) && !wildcardFileMap.has(key)) {
-                    wildcardFileMap.set(key, file_14);
-                }
-            }
-        }
-        var literalFiles = ts.arrayFrom(literalFileMap.values());
-        var wildcardFiles = ts.arrayFrom(wildcardFileMap.values());
-        var projectReferences = spec.referencesSpecs && spec.referencesSpecs.map(function (r) {
-            return __assign({}, r, { path: ts.getNormalizedAbsolutePath(r.path, basePath) });
-        });
-        return {
-            fileNames: literalFiles.concat(wildcardFiles),
-            projectReferences: projectReferences,
-            wildcardDirectories: wildcardDirectories,
-            spec: spec
-        };
-    }
-    ts.getFileNamesFromConfigSpecs = getFileNamesFromConfigSpecs;
-    function validateSpecs(specs, errors, allowTrailingRecursion, jsonSourceFile, specKey) {
-        return specs.filter(function (spec) {
-            var diag = specToDiagnostic(spec, allowTrailingRecursion);
-            if (diag !== undefined) {
-                errors.push(createDiagnostic(diag, spec));
-            }
-            return diag === undefined;
-        });
-        function createDiagnostic(message, spec) {
-            var element = ts.getTsConfigPropArrayElementValue(jsonSourceFile, specKey, spec);
-            return element ?
-                ts.createDiagnosticForNodeInSourceFile(jsonSourceFile, element, message, spec) :
-                ts.createCompilerDiagnostic(message, spec);
-        }
-    }
-    function specToDiagnostic(spec, allowTrailingRecursion) {
-        if (!allowTrailingRecursion && invalidTrailingRecursionPattern.test(spec)) {
-            return ts.Diagnostics.File_specification_cannot_end_in_a_recursive_directory_wildcard_Asterisk_Asterisk_Colon_0;
-        }
-        else if (invalidDotDotAfterRecursiveWildcardPattern.test(spec)) {
-            return ts.Diagnostics.File_specification_cannot_contain_a_parent_directory_that_appears_after_a_recursive_directory_wildcard_Asterisk_Asterisk_Colon_0;
-        }
-    }
-    /**
-     * Gets directories in a set of include patterns that should be watched for changes.
-     */
-    function getWildcardDirectories(include, exclude, path, useCaseSensitiveFileNames) {
-        // We watch a directory recursively if it contains a wildcard anywhere in a directory segment
-        // of the pattern:
-        //
-        //  /a/b/**/d   - Watch /a/b recursively to catch changes to any d in any subfolder recursively
-        //  /a/b/*/d    - Watch /a/b recursively to catch any d in any immediate subfolder, even if a new subfolder is added
-        //  /a/b        - Watch /a/b recursively to catch changes to anything in any recursive subfoler
-        //
-        // We watch a directory without recursion if it contains a wildcard in the file segment of
-        // the pattern:
-        //
-        //  /a/b/*      - Watch /a/b directly to catch any new file
-        //  /a/b/a?z    - Watch /a/b directly to catch any new file matching a?z
-        var rawExcludeRegex = ts.getRegularExpressionForWildcard(exclude, path, "exclude");
-        var excludeRegex = rawExcludeRegex && new RegExp(rawExcludeRegex, useCaseSensitiveFileNames ? "" : "i");
-        var wildcardDirectories = {};
-        if (include !== undefined) {
-            var recursiveKeys = [];
-            for (var _i = 0, include_1 = include; _i < include_1.length; _i++) {
-                var file_15 = include_1[_i];
-                var spec = ts.normalizePath(ts.combinePaths(path, file_15));
-                if (excludeRegex && excludeRegex.test(spec)) {
-                    continue;
-                }
-                var match = getWildcardDirectoryFromSpec(spec, useCaseSensitiveFileNames);
-                if (match) {
-                    var key = match.key, flags = match.flags;
-                    var existingFlags = wildcardDirectories[key];
-                    if (existingFlags === undefined || existingFlags < flags) {
-                        wildcardDirectories[key] = flags;
-                        if (flags === 1 /* Recursive */) {
-                            recursiveKeys.push(key);
-                        }
-                    }
-                }
-            }
-            // Remove any subpaths under an existing recursively watched directory.
-            for (var key in wildcardDirectories) {
-                if (ts.hasProperty(wildcardDirectories, key)) {
-                    for (var _a = 0, recursiveKeys_1 = recursiveKeys; _a < recursiveKeys_1.length; _a++) {
-                        var recursiveKey = recursiveKeys_1[_a];
-                        if (key !== recursiveKey && ts.containsPath(recursiveKey, key, path, !useCaseSensitiveFileNames)) {
-                            delete wildcardDirectories[key];
-                        }
-                    }
-                }
-            }
-        }
-        return wildcardDirectories;
-    }
-    function getWildcardDirectoryFromSpec(spec, useCaseSensitiveFileNames) {
-        var match = wildcardDirectoryPattern.exec(spec);
-        if (match) {
             return {
-                key: useCaseSensitiveFileNames ? match[0] : match[0].toLowerCase(),
-                flags: watchRecursivePattern.test(spec) ? 1 /* Recursive */ : 0 /* None */
+                buildQueue: buildOrder,
+                dependencyMap: graph
             };
-        }
-        if (ts.isImplicitGlob(spec)) {
-            return { key: spec, flags: 1 /* Recursive */ };
-        }
-        return undefined;
-    }
-    /**
-     * Determines whether a literal or wildcard file has already been included that has a higher
-     * extension priority.
-     *
-     * @param file The path to the file.
-     * @param extensionPriority The priority of the extension.
-     * @param context The expansion context.
-     */
-    function hasFileWithHigherPriorityExtension(file, literalFiles, wildcardFiles, extensions, keyMapper) {
-        var extensionPriority = ts.getExtensionPriority(file, extensions);
-        var adjustedExtensionPriority = ts.adjustExtensionPriority(extensionPriority, extensions);
-        for (var i = 0 /* Highest */; i < adjustedExtensionPriority; i++) {
-            var higherPriorityExtension = extensions[i];
-            var higherPriorityPath = keyMapper(ts.changeExtension(file, higherPriorityExtension));
-            if (literalFiles.has(higherPriorityPath) || wildcardFiles.has(higherPriorityPath)) {
-                return true;
+            function visit(projPath, inCircularContext) {
+                if (inCircularContext === void 0) { inCircularContext = false; }
+                // Already visited
+                if (permanentMarks[projPath])
+                    return;
+                // Circular
+                if (temporaryMarks[projPath]) {
+                    if (!inCircularContext) {
+                        hadError = true;
+                        buildHost.error(ts.Diagnostics.Project_references_may_not_form_a_circular_graph_Cycle_detected_Colon_0, circularityReportStack.join("\r\n"));
+                        return;
+                    }
+                }
+                temporaryMarks[projPath] = true;
+                circularityReportStack.push(projPath);
+                var parsed = configFileCache.parseConfigFile(projPath);
+                if (parsed === undefined) {
+                    hadError = true;
+                    return;
+                }
+                if (parsed.projectReferences) {
+                    for (var _i = 0, _a = parsed.projectReferences; _i < _a.length; _i++) {
+                        var ref = _a[_i];
+                        var resolvedRefPath = resolveProjectName(ref.path);
+                        if (resolvedRefPath === undefined) {
+                            hadError = true;
+                            break;
+                        }
+                        visit(resolvedRefPath, inCircularContext || ref.circular);
+                        graph.addReference(projPath, resolvedRefPath);
+                    }
+                }
+                circularityReportStack.pop();
+                permanentMarks[projPath] = true;
+                buildOrder.push(projPath);
             }
         }
-        return false;
-    }
-    /**
-     * Removes files included via wildcard expansion with a lower extension priority that have
-     * already been included.
-     *
-     * @param file The path to the file.
-     * @param extensionPriority The priority of the extension.
-     * @param context The expansion context.
-     */
-    function removeWildcardFilesWithLowerPriorityExtension(file, wildcardFiles, extensions, keyMapper) {
-        var extensionPriority = ts.getExtensionPriority(file, extensions);
-        var nextExtensionPriority = ts.getNextLowestExtensionPriority(extensionPriority, extensions);
-        for (var i = nextExtensionPriority; i < extensions.length; i++) {
-            var lowerPriorityExtension = extensions[i];
-            var lowerPriorityPath = keyMapper(ts.changeExtension(file, lowerPriorityExtension));
-            wildcardFiles.delete(lowerPriorityPath);
-        }
-    }
-    /**
-     * Produces a cleaned version of compiler options with personally identifiying info (aka, paths) removed.
-     * Also converts enum values back to strings.
-     */
-    /* @internal */
-    function convertCompilerOptionsForTelemetry(opts) {
-        var out = {};
-        for (var key in opts) {
-            if (opts.hasOwnProperty(key)) {
-                var type = getOptionFromName(key);
-                if (type !== undefined) { // Ignore unknown options
-                    out[key] = getOptionValueWithEmptyStrings(opts[key], type);
+        function buildSingleProject(proj) {
+            if (context.options.dry) {
+                buildHost.message(ts.Diagnostics.A_non_dry_build_would_build_project_0, proj);
+                return BuildResultFlags.Success;
+            }
+            if (context.options.verbose)
+                buildHost.verbose(ts.Diagnostics.Building_project_0, proj);
+            var resultFlags = BuildResultFlags.None;
+            resultFlags |= BuildResultFlags.DeclarationOutputUnchanged;
+            var configFile = configFileCache.parseConfigFile(proj);
+            if (!configFile) {
+                // Failed to read the config file
+                resultFlags |= BuildResultFlags.ConfigFileErrors;
+                context.projectStatus.setValue(proj, { type: UpToDateStatusType.Unbuildable, reason: "Config file errors" });
+                return resultFlags;
+            }
+            if (configFile.fileNames.length === 0) {
+                // Nothing to build - must be a solution file, basically
+                return BuildResultFlags.None;
+            }
+            var programOptions = {
+                projectReferences: configFile.projectReferences,
+                host: compilerHost,
+                rootNames: configFile.fileNames,
+                options: configFile.options
+            };
+            var program = ts.createProgram(programOptions);
+            // Don't emit anything in the presence of syntactic errors or options diagnostics
+            var syntaxDiagnostics = program.getOptionsDiagnostics().concat(program.getSyntacticDiagnostics());
+            if (syntaxDiagnostics.length) {
+                resultFlags |= BuildResultFlags.SyntaxErrors;
+                for (var _i = 0, syntaxDiagnostics_1 = syntaxDiagnostics; _i < syntaxDiagnostics_1.length; _i++) {
+                    var diag = syntaxDiagnostics_1[_i];
+                    buildHost.errorDiagnostic(diag);
+                }
+                context.projectStatus.setValue(proj, { type: UpToDateStatusType.Unbuildable, reason: "Syntactic errors" });
+                return resultFlags;
+            }
+            // Don't emit .d.ts if there are decl file errors
+            if (program.getCompilerOptions().declaration) {
+                var declDiagnostics = program.getDeclarationDiagnostics();
+                if (declDiagnostics.length) {
+                    resultFlags |= BuildResultFlags.DeclarationEmitErrors;
+                    for (var _a = 0, declDiagnostics_1 = declDiagnostics; _a < declDiagnostics_1.length; _a++) {
+                        var diag = declDiagnostics_1[_a];
+                        buildHost.errorDiagnostic(diag);
+                    }
+                    context.projectStatus.setValue(proj, { type: UpToDateStatusType.Unbuildable, reason: "Declaration file errors" });
+                    return resultFlags;
                 }
             }
-        }
-        return out;
-    }
-    ts.convertCompilerOptionsForTelemetry = convertCompilerOptionsForTelemetry;
-    function getOptionValueWithEmptyStrings(value, option) {
-        switch (option.type) {
-            case "object": // "paths". Can't get any useful information from the value since we blank out strings, so just return "".
-                return "";
-            case "string": // Could be any arbitrary string -- use empty string instead.
-                return "";
-            case "number": // Allow numbers, but be sure to check it's actually a number.
-                return typeof value === "number" ? value : "";
-            case "boolean":
-                return typeof value === "boolean" ? value : "";
-            case "list":
-                var elementType_1 = option.element;
-                return ts.isArray(value) ? value.map(function (v) { return getOptionValueWithEmptyStrings(v, elementType_1); }) : "";
-            default:
-                return ts.forEachEntry(option.type, function (optionEnumValue, optionStringValue) {
-                    if (optionEnumValue === value) {
-                        return optionStringValue;
+            // Same as above but now for semantic diagnostics
+            var semanticDiagnostics = program.getSemanticDiagnostics();
+            if (semanticDiagnostics.length) {
+                resultFlags |= BuildResultFlags.TypeErrors;
+                for (var _b = 0, semanticDiagnostics_1 = semanticDiagnostics; _b < semanticDiagnostics_1.length; _b++) {
+                    var diag = semanticDiagnostics_1[_b];
+                    buildHost.errorDiagnostic(diag);
+                }
+                context.projectStatus.setValue(proj, { type: UpToDateStatusType.Unbuildable, reason: "Semantic errors" });
+                return resultFlags;
+            }
+            var newestDeclarationFileContentChangedTime = minimumDate;
+            program.emit(/*targetSourceFile*/ undefined, function (fileName, content, writeBom, onError) {
+                var priorChangeTime;
+                if (isDeclarationFile(fileName) && compilerHost.fileExists(fileName)) {
+                    if (compilerHost.readFile(fileName) === content) {
+                        // Check for unchanged .d.ts files
+                        resultFlags &= ~BuildResultFlags.DeclarationOutputUnchanged;
+                        priorChangeTime = compilerHost.getModifiedTime && compilerHost.getModifiedTime(fileName);
                     }
-                }); // TODO: GH#18217
+                }
+                compilerHost.writeFile(fileName, content, writeBom, onError, ts.emptyArray);
+                if (priorChangeTime !== undefined) {
+                    newestDeclarationFileContentChangedTime = newer(priorChangeTime, newestDeclarationFileContentChangedTime);
+                    context.unchangedOutputs.setValue(fileName, priorChangeTime);
+                }
+            });
+            context.projectStatus.setValue(proj, { type: UpToDateStatusType.UpToDate, newestDeclarationFileContentChangedTime: newestDeclarationFileContentChangedTime });
+            return resultFlags;
+        }
+        function updateOutputTimestamps(proj) {
+            if (context.options.dry) {
+                return buildHost.message(ts.Diagnostics.A_non_dry_build_would_build_project_0, proj.options.configFilePath);
+            }
+            if (context.options.verbose)
+                buildHost.verbose(ts.Diagnostics.Updating_output_timestamps_of_project_0, proj.options.configFilePath);
+            var now = new Date();
+            var outputs = getAllProjectOutputs(proj);
+            var priorNewestUpdateTime = minimumDate;
+            for (var _i = 0, outputs_2 = outputs; _i < outputs_2.length; _i++) {
+                var file = outputs_2[_i];
+                if (isDeclarationFile(file)) {
+                    priorNewestUpdateTime = newer(priorNewestUpdateTime, compilerHost.getModifiedTime(file));
+                }
+                compilerHost.setModifiedTime(file, now);
+            }
+            context.projectStatus.setValue(proj.options.configFilePath, { type: UpToDateStatusType.UpToDate, newestDeclarationFileContentChangedTime: priorNewestUpdateTime });
+        }
+        function getFilesToClean(configFileNames) {
+            var resolvedNames = resolveProjectNames(configFileNames);
+            if (resolvedNames === undefined)
+                return undefined;
+            // Get the same graph for cleaning we'd use for building
+            var graph = createDependencyGraph(resolvedNames);
+            if (graph === undefined)
+                return undefined;
+            var filesToDelete = [];
+            for (var _i = 0, _a = graph.buildQueue; _i < _a.length; _i++) {
+                var proj = _a[_i];
+                var parsed = configFileCache.parseConfigFile(proj);
+                if (parsed === undefined) {
+                    // File has gone missing; fine to ignore here
+                    continue;
+                }
+                var outputs = getAllProjectOutputs(parsed);
+                for (var _b = 0, outputs_3 = outputs; _b < outputs_3.length; _b++) {
+                    var output = outputs_3[_b];
+                    if (compilerHost.fileExists(output)) {
+                        filesToDelete.push(output);
+                    }
+                }
+            }
+            return filesToDelete;
+        }
+        function getAllProjectsInScope() {
+            var resolvedNames = resolveProjectNames(rootNames);
+            if (resolvedNames === undefined)
+                return undefined;
+            var graph = createDependencyGraph(resolvedNames);
+            if (graph === undefined)
+                return undefined;
+            return graph.buildQueue;
+        }
+        function cleanAllProjects() {
+            var resolvedNames = getAllProjectsInScope();
+            if (resolvedNames === undefined) {
+                return buildHost.message(ts.Diagnostics.Skipping_clean_because_not_all_projects_could_be_located);
+            }
+            var filesToDelete = getFilesToClean(resolvedNames);
+            if (filesToDelete === undefined) {
+                return buildHost.message(ts.Diagnostics.Skipping_clean_because_not_all_projects_could_be_located);
+            }
+            if (context.options.dry) {
+                return buildHost.message(ts.Diagnostics.A_non_dry_build_would_delete_the_following_files_Colon_0, filesToDelete.map(function (f) { return "\r\n * " + f; }).join(""));
+            }
+            // Do this check later to allow --clean --dry to function even if the host can't delete files
+            if (!compilerHost.deleteFile) {
+                throw new Error("Host does not support deleting files");
+            }
+            for (var _i = 0, filesToDelete_1 = filesToDelete; _i < filesToDelete_1.length; _i++) {
+                var output = filesToDelete_1[_i];
+                compilerHost.deleteFile(output);
+            }
+        }
+        function resolveProjectName(name) {
+            var fullPath = ts.resolvePath(compilerHost.getCurrentDirectory(), name);
+            if (compilerHost.fileExists(fullPath)) {
+                return fullPath;
+            }
+            var fullPathWithTsconfig = ts.combinePaths(fullPath, "tsconfig.json");
+            if (compilerHost.fileExists(fullPathWithTsconfig)) {
+                return fullPathWithTsconfig;
+            }
+            buildHost.error(ts.Diagnostics.File_0_not_found, relName(fullPath));
+            return undefined;
+        }
+        function resolveProjectNames(configFileNames) {
+            var resolvedNames = [];
+            for (var _i = 0, configFileNames_1 = configFileNames; _i < configFileNames_1.length; _i++) {
+                var name = configFileNames_1[_i];
+                var resolved = resolveProjectName(name);
+                if (resolved === undefined) {
+                    return undefined;
+                }
+                resolvedNames.push(resolved);
+            }
+            return resolvedNames;
+        }
+        function buildAllProjects() {
+            var graph = getGlobalDependencyGraph();
+            if (graph === undefined)
+                return;
+            var queue = graph.buildQueue;
+            reportBuildQueue(graph);
+            for (var _i = 0, queue_1 = queue; _i < queue_1.length; _i++) {
+                var next = queue_1[_i];
+                var proj = configFileCache.parseConfigFile(next);
+                if (proj === undefined) {
+                    break;
+                }
+                var status = getUpToDateStatus(proj);
+                verboseReportProjectStatus(next, status);
+                var projName = proj.options.configFilePath;
+                if (status.type === UpToDateStatusType.UpToDate && !context.options.force) {
+                    // Up to date, skip
+                    if (defaultOptions.dry) {
+                        // In a dry build, inform the user of this fact
+                        buildHost.message(ts.Diagnostics.Project_0_is_up_to_date, projName);
+                    }
+                    continue;
+                }
+                if (status.type === UpToDateStatusType.UpToDateWithUpstreamTypes && !context.options.force) {
+                    // Fake build
+                    updateOutputTimestamps(proj);
+                    continue;
+                }
+                if (status.type === UpToDateStatusType.UpstreamBlocked) {
+                    if (context.options.verbose)
+                        buildHost.verbose(ts.Diagnostics.Skipping_build_of_project_0_because_its_dependency_1_has_errors, projName, status.upstreamProjectName);
+                    continue;
+                }
+                if (status.type === UpToDateStatusType.ContainerOnly) {
+                    // Do nothing
+                    continue;
+                }
+                buildSingleProject(next);
+            }
+        }
+        /**
+         * Report the build ordering inferred from the current project graph if we're in verbose mode
+         */
+        function reportBuildQueue(graph) {
+            if (!context.options.verbose)
+                return;
+            var names = [];
+            for (var _i = 0, _a = graph.buildQueue; _i < _a.length; _i++) {
+                var name = _a[_i];
+                names.push(name);
+            }
+            if (context.options.verbose)
+                buildHost.verbose(ts.Diagnostics.Projects_in_this_build_Colon_0, names.map(function (s) { return "\r\n    * " + relName(s); }).join(""));
+        }
+        function relName(path) {
+            return ts.convertToRelativePath(path, compilerHost.getCurrentDirectory(), function (f) { return compilerHost.getCanonicalFileName(f); });
+        }
+        /**
+         * Report the up-to-date status of a project if we're in verbose mode
+         */
+        function verboseReportProjectStatus(configFileName, status) {
+            if (!context.options.verbose)
+                return;
+            switch (status.type) {
+                case UpToDateStatusType.OutOfDateWithSelf:
+                    return buildHost.verbose(ts.Diagnostics.Project_0_is_out_of_date_because_oldest_output_1_is_older_than_newest_input_2, relName(configFileName), relName(status.outOfDateOutputFileName), relName(status.newerInputFileName));
+                case UpToDateStatusType.OutOfDateWithUpstream:
+                    return buildHost.verbose(ts.Diagnostics.Project_0_is_out_of_date_because_oldest_output_1_is_older_than_newest_input_2, relName(configFileName), relName(status.outOfDateOutputFileName), relName(status.newerProjectName));
+                case UpToDateStatusType.OutputMissing:
+                    return buildHost.verbose(ts.Diagnostics.Project_0_is_out_of_date_because_output_file_1_does_not_exist, relName(configFileName), relName(status.missingOutputFileName));
+                case UpToDateStatusType.UpToDate:
+                    if (status.newestInputFileTime !== undefined) {
+                        return buildHost.verbose(ts.Diagnostics.Project_0_is_up_to_date_because_newest_input_1_is_older_than_oldest_output_2, relName(configFileName), relName(status.newestInputFileName), relName(status.oldestOutputFileName));
+                    }
+                    // Don't report anything for "up to date because it was already built" -- too verbose
+                    break;
+                case UpToDateStatusType.UpToDateWithUpstreamTypes:
+                    return buildHost.verbose(ts.Diagnostics.Project_0_is_up_to_date_with_d_ts_files_from_its_dependencies, relName(configFileName));
+                case UpToDateStatusType.UpstreamOutOfDate:
+                    return buildHost.verbose(ts.Diagnostics.Project_0_is_out_of_date_because_its_dependency_1_is_out_of_date, relName(configFileName), relName(status.upstreamProjectName));
+                case UpToDateStatusType.UpstreamBlocked:
+                    return buildHost.verbose(ts.Diagnostics.Project_0_can_t_be_built_because_its_dependency_1_has_errors, relName(configFileName), relName(status.upstreamProjectName));
+                case UpToDateStatusType.Unbuildable:
+                    return buildHost.verbose(ts.Diagnostics.Failed_to_parse_file_0_Colon_1, relName(configFileName), status.reason);
+                case UpToDateStatusType.ContainerOnly:
+                    // Don't report status on "solution" projects
+                    break;
+                default:
+                    ts.assertTypeIsNever(status);
+            }
         }
     }
+    ts.createSolutionBuilder = createSolutionBuilder;
 })(ts || (ts = {}));
+//# sourceMappingURL=compiler.js.map
+"use strict";
+var ts;
+(function (ts) {
+    var server;
+    (function (server) {
+        // tslint:disable variable-name
+        server.ActionSet = "action::set";
+        server.ActionInvalidate = "action::invalidate";
+        server.ActionPackageInstalled = "action::packageInstalled";
+        server.EventTypesRegistry = "event::typesRegistry";
+        server.EventBeginInstallTypes = "event::beginInstallTypes";
+        server.EventEndInstallTypes = "event::endInstallTypes";
+        server.EventInitializationFailed = "event::initializationFailed";
+        var Arguments;
+        (function (Arguments) {
+            Arguments.GlobalCacheLocation = "--globalTypingsCacheLocation";
+            Arguments.LogFile = "--logFile";
+            Arguments.EnableTelemetry = "--enableTelemetry";
+            Arguments.TypingSafeListLocation = "--typingSafeListLocation";
+            Arguments.TypesMapLocation = "--typesMapLocation";
+            /**
+             * This argument specifies the location of the NPM executable.
+             * typingsInstaller will run the command with `${npmLocation} install ...`.
+             */
+            Arguments.NpmLocation = "--npmLocation";
+        })(Arguments = server.Arguments || (server.Arguments = {}));
+        function hasArgument(argumentName) {
+            return ts.sys.args.indexOf(argumentName) >= 0;
+        }
+        server.hasArgument = hasArgument;
+        function findArgument(argumentName) {
+            var index = ts.sys.args.indexOf(argumentName);
+            return index >= 0 && index < ts.sys.args.length - 1
+                ? ts.sys.args[index + 1]
+                : undefined;
+        }
+        server.findArgument = findArgument;
+        /*@internal*/
+        function nowString() {
+            // E.g. "12:34:56.789"
+            var d = new Date();
+            return d.getHours() + ":" + d.getMinutes() + ":" + d.getSeconds() + "." + d.getMilliseconds();
+        }
+        server.nowString = nowString;
+    })(server = ts.server || (ts.server = {}));
+})(ts || (ts = {}));
+/* @internal */
+var ts;
+(function (ts) {
+    var JsTyping;
+    (function (JsTyping) {
+        /* @internal */
+        function isTypingUpToDate(cachedTyping, availableTypingVersions) {
+            var availableVersion = ts.Semver.parse(ts.getProperty(availableTypingVersions, "ts" + ts.versionMajorMinor) || ts.getProperty(availableTypingVersions, "latest"));
+            return !availableVersion.greaterThan(cachedTyping.version);
+        }
+        JsTyping.isTypingUpToDate = isTypingUpToDate;
+        /* @internal */
+        JsTyping.nodeCoreModuleList = [
+            "assert",
+            "async_hooks",
+            "buffer",
+            "child_process",
+            "cluster",
+            "console",
+            "constants",
+            "crypto",
+            "dgram",
+            "dns",
+            "domain",
+            "events",
+            "fs",
+            "http",
+            "https",
+            "http2",
+            "inspector",
+            "net",
+            "os",
+            "path",
+            "perf_hooks",
+            "process",
+            "punycode",
+            "querystring",
+            "readline",
+            "repl",
+            "stream",
+            "string_decoder",
+            "timers",
+            "tls",
+            "tty",
+            "url",
+            "util",
+            "v8",
+            "vm",
+            "zlib"
+        ];
+        /* @internal */
+        JsTyping.nodeCoreModules = ts.arrayToSet(JsTyping.nodeCoreModuleList);
+        function loadSafeList(host, safeListPath) {
+            var result = ts.readConfigFile(safeListPath, function (path) { return host.readFile(path); });
+            return ts.createMapFromTemplate(result.config);
+        }
+        JsTyping.loadSafeList = loadSafeList;
+        function loadTypesMap(host, typesMapPath) {
+            var result = ts.readConfigFile(typesMapPath, function (path) { return host.readFile(path); });
+            if (result.config) {
+                return ts.createMapFromTemplate(result.config.simpleMap);
+            }
+            return undefined;
+        }
+        JsTyping.loadTypesMap = loadTypesMap;
+        /**
+         * @param host is the object providing I/O related operations.
+         * @param fileNames are the file names that belong to the same project
+         * @param projectRootPath is the path to the project root directory
+         * @param safeListPath is the path used to retrieve the safe list
+         * @param packageNameToTypingLocation is the map of package names to their cached typing locations and installed versions
+         * @param typeAcquisition is used to customize the typing acquisition process
+         * @param compilerOptions are used as a source for typing inference
+         */
+        function discoverTypings(host, log, fileNames, projectRootPath, safeList, packageNameToTypingLocation, typeAcquisition, unresolvedImports, typesRegistry) {
+            if (!typeAcquisition || !typeAcquisition.enable) {
+                return { cachedTypingPaths: [], newTypingNames: [], filesToWatch: [] };
+            }
+            // A typing name to typing file path mapping
+            var inferredTypings = ts.createMap();
+            // Only infer typings for .js and .jsx files
+            fileNames = ts.mapDefined(fileNames, function (fileName) {
+                var path = ts.normalizePath(fileName);
+                if (ts.hasJavaScriptFileExtension(path)) {
+                    return path;
+                }
+            });
+            var filesToWatch = [];
+            if (typeAcquisition.include)
+                addInferredTypings(typeAcquisition.include, "Explicitly included types");
+            var exclude = typeAcquisition.exclude || [];
+            // Directories to search for package.json, bower.json and other typing information
+            var possibleSearchDirs = ts.arrayToSet(fileNames, ts.getDirectoryPath);
+            possibleSearchDirs.set(projectRootPath, true);
+            possibleSearchDirs.forEach(function (_true, searchDir) {
+                var packageJsonPath = ts.combinePaths(searchDir, "package.json");
+                getTypingNamesFromJson(packageJsonPath, filesToWatch);
+                var bowerJsonPath = ts.combinePaths(searchDir, "bower.json");
+                getTypingNamesFromJson(bowerJsonPath, filesToWatch);
+                var bowerComponentsPath = ts.combinePaths(searchDir, "bower_components");
+                getTypingNamesFromPackagesFolder(bowerComponentsPath, filesToWatch);
+                var nodeModulesPath = ts.combinePaths(searchDir, "node_modules");
+                getTypingNamesFromPackagesFolder(nodeModulesPath, filesToWatch);
+            });
+            getTypingNamesFromSourceFileNames(fileNames);
+            // add typings for unresolved imports
+            if (unresolvedImports) {
+                var module_1 = ts.deduplicate(unresolvedImports.map(function (moduleId) { return JsTyping.nodeCoreModules.has(moduleId) ? "node" : moduleId; }), ts.equateStringsCaseSensitive, ts.compareStringsCaseSensitive);
+                addInferredTypings(module_1, "Inferred typings from unresolved imports");
+            }
+            // Add the cached typing locations for inferred typings that are already installed
+            packageNameToTypingLocation.forEach(function (typing, name) {
+                var registryEntry = typesRegistry.get(name);
+                if (inferredTypings.has(name) && inferredTypings.get(name) === undefined && registryEntry !== undefined && isTypingUpToDate(typing, registryEntry)) {
+                    inferredTypings.set(name, typing.typingLocation);
+                }
+            });
+            // Remove typings that the user has added to the exclude list
+            for (var _i = 0, exclude_1 = exclude; _i < exclude_1.length; _i++) {
+                var excludeTypingName = exclude_1[_i];
+                var didDelete = inferredTypings.delete(excludeTypingName);
+                if (didDelete && log)
+                    log("Typing for " + excludeTypingName + " is in exclude list, will be ignored.");
+            }
+            var newTypingNames = [];
+            var cachedTypingPaths = [];
+            inferredTypings.forEach(function (inferred, typing) {
+                if (inferred !== undefined) {
+                    cachedTypingPaths.push(inferred);
+                }
+                else {
+                    newTypingNames.push(typing);
+                }
+            });
+            var result = { cachedTypingPaths: cachedTypingPaths, newTypingNames: newTypingNames, filesToWatch: filesToWatch };
+            if (log)
+                log("Result: " + JSON.stringify(result));
+            return result;
+            function addInferredTyping(typingName) {
+                if (!inferredTypings.has(typingName)) {
+                    inferredTypings.set(typingName, undefined); // TODO: GH#18217
+                }
+            }
+            function addInferredTypings(typingNames, message) {
+                if (log)
+                    log(message + ": " + JSON.stringify(typingNames));
+                ts.forEach(typingNames, addInferredTyping);
+            }
+            /**
+             * Get the typing info from common package manager json files like package.json or bower.json
+             */
+            function getTypingNamesFromJson(jsonPath, filesToWatch) {
+                if (!host.fileExists(jsonPath)) {
+                    return;
+                }
+                filesToWatch.push(jsonPath);
+                var jsonConfig = ts.readConfigFile(jsonPath, function (path) { return host.readFile(path); }).config;
+                var jsonTypingNames = ts.flatMap([jsonConfig.dependencies, jsonConfig.devDependencies, jsonConfig.optionalDependencies, jsonConfig.peerDependencies], ts.getOwnKeys);
+                addInferredTypings(jsonTypingNames, "Typing names in '" + jsonPath + "' dependencies");
+            }
+            /**
+             * Infer typing names from given file names. For example, the file name "jquery-min.2.3.4.js"
+             * should be inferred to the 'jquery' typing name; and "angular-route.1.2.3.js" should be inferred
+             * to the 'angular-route' typing name.
+             * @param fileNames are the names for source files in the project
+             */
+            function getTypingNamesFromSourceFileNames(fileNames) {
+                var fromFileNames = ts.mapDefined(fileNames, function (j) {
+                    if (!ts.hasJavaScriptFileExtension(j))
+                        return undefined;
+                    var inferredTypingName = ts.removeFileExtension(ts.getBaseFileName(j.toLowerCase()));
+                    var cleanedTypingName = ts.removeMinAndVersionNumbers(inferredTypingName);
+                    return safeList.get(cleanedTypingName);
+                });
+                if (fromFileNames.length) {
+                    addInferredTypings(fromFileNames, "Inferred typings from file names");
+                }
+                var hasJsxFile = ts.some(fileNames, function (f) { return ts.fileExtensionIs(f, ".jsx" /* Jsx */); });
+                if (hasJsxFile) {
+                    if (log)
+                        log("Inferred 'react' typings due to presence of '.jsx' extension");
+                    addInferredTyping("react");
+                }
+            }
+            /**
+             * Infer typing names from packages folder (ex: node_module, bower_components)
+             * @param packagesFolderPath is the path to the packages folder
+             */
+            function getTypingNamesFromPackagesFolder(packagesFolderPath, filesToWatch) {
+                filesToWatch.push(packagesFolderPath);
+                // Todo: add support for ModuleResolutionHost too
+                if (!host.directoryExists(packagesFolderPath)) {
+                    return;
+                }
+                // depth of 2, so we access `node_modules/foo` but not `node_modules/foo/bar`
+                var fileNames = host.readDirectory(packagesFolderPath, [".json" /* Json */], /*excludes*/ undefined, /*includes*/ undefined, /*depth*/ 2);
+                if (log)
+                    log("Searching for typing names in " + packagesFolderPath + "; all files: " + JSON.stringify(fileNames));
+                var packageNames = [];
+                for (var _i = 0, fileNames_1 = fileNames; _i < fileNames_1.length; _i++) {
+                    var fileName = fileNames_1[_i];
+                    var normalizedFileName = ts.normalizePath(fileName);
+                    var baseFileName = ts.getBaseFileName(normalizedFileName);
+                    if (baseFileName !== "package.json" && baseFileName !== "bower.json") {
+                        continue;
+                    }
+                    var result_1 = ts.readConfigFile(normalizedFileName, function (path) { return host.readFile(path); });
+                    var packageJson = result_1.config;
+                    // npm 3's package.json contains a "_requiredBy" field
+                    // we should include all the top level module names for npm 2, and only module names whose
+                    // "_requiredBy" field starts with "#" or equals "/" for npm 3.
+                    if (baseFileName === "package.json" && packageJson._requiredBy &&
+                        ts.filter(packageJson._requiredBy, function (r) { return r[0] === "#" || r === "/"; }).length === 0) {
+                        continue;
+                    }
+                    // If the package has its own d.ts typings, those will take precedence. Otherwise the package name will be used
+                    // to download d.ts files from DefinitelyTyped
+                    if (!packageJson.name) {
+                        continue;
+                    }
+                    var ownTypes = packageJson.types || packageJson.typings;
+                    if (ownTypes) {
+                        var absolutePath = ts.getNormalizedAbsolutePath(ownTypes, ts.getDirectoryPath(normalizedFileName));
+                        if (log)
+                            log("    Package '" + packageJson.name + "' provides its own types.");
+                        inferredTypings.set(packageJson.name, absolutePath);
+                    }
+                    else {
+                        packageNames.push(packageJson.name);
+                    }
+                }
+                addInferredTypings(packageNames, "    Found package names");
+            }
+        }
+        JsTyping.discoverTypings = discoverTypings;
+        var PackageNameValidationResult;
+        (function (PackageNameValidationResult) {
+            PackageNameValidationResult[PackageNameValidationResult["Ok"] = 0] = "Ok";
+            PackageNameValidationResult[PackageNameValidationResult["ScopedPackagesNotSupported"] = 1] = "ScopedPackagesNotSupported";
+            PackageNameValidationResult[PackageNameValidationResult["EmptyName"] = 2] = "EmptyName";
+            PackageNameValidationResult[PackageNameValidationResult["NameTooLong"] = 3] = "NameTooLong";
+            PackageNameValidationResult[PackageNameValidationResult["NameStartsWithDot"] = 4] = "NameStartsWithDot";
+            PackageNameValidationResult[PackageNameValidationResult["NameStartsWithUnderscore"] = 5] = "NameStartsWithUnderscore";
+            PackageNameValidationResult[PackageNameValidationResult["NameContainsNonURISafeCharacters"] = 6] = "NameContainsNonURISafeCharacters";
+        })(PackageNameValidationResult = JsTyping.PackageNameValidationResult || (JsTyping.PackageNameValidationResult = {}));
+        var maxPackageNameLength = 214;
+        /**
+         * Validates package name using rules defined at https://docs.npmjs.com/files/package.json
+         */
+        function validatePackageName(packageName) {
+            if (!packageName) {
+                return 2 /* EmptyName */;
+            }
+            if (packageName.length > maxPackageNameLength) {
+                return 3 /* NameTooLong */;
+            }
+            if (packageName.charCodeAt(0) === 46 /* dot */) {
+                return 4 /* NameStartsWithDot */;
+            }
+            if (packageName.charCodeAt(0) === 95 /* _ */) {
+                return 5 /* NameStartsWithUnderscore */;
+            }
+            // check if name is scope package like: starts with @ and has one '/' in the middle
+            // scoped packages are not currently supported
+            // TODO: when support will be added we'll need to split and check both scope and package name
+            if (/^@[^/]+\/[^/]+$/.test(packageName)) {
+                return 1 /* ScopedPackagesNotSupported */;
+            }
+            if (encodeURIComponent(packageName) !== packageName) {
+                return 6 /* NameContainsNonURISafeCharacters */;
+            }
+            return 0 /* Ok */;
+        }
+        JsTyping.validatePackageName = validatePackageName;
+        function renderPackageNameValidationFailure(result, typing) {
+            switch (result) {
+                case 2 /* EmptyName */:
+                    return "Package name '" + typing + "' cannot be empty";
+                case 3 /* NameTooLong */:
+                    return "Package name '" + typing + "' should be less than " + maxPackageNameLength + " characters";
+                case 4 /* NameStartsWithDot */:
+                    return "Package name '" + typing + "' cannot start with '.'";
+                case 5 /* NameStartsWithUnderscore */:
+                    return "Package name '" + typing + "' cannot start with '_'";
+                case 1 /* ScopedPackagesNotSupported */:
+                    return "Package '" + typing + "' is scoped and currently is not supported";
+                case 6 /* NameContainsNonURISafeCharacters */:
+                    return "Package name '" + typing + "' contains non URI safe characters";
+                case 0 /* Ok */:
+                    return ts.Debug.fail(); // Shouldn't have called this.
+                default:
+                    throw ts.Debug.assertNever(result);
+            }
+        }
+        JsTyping.renderPackageNameValidationFailure = renderPackageNameValidationFailure;
+    })(JsTyping = ts.JsTyping || (ts.JsTyping = {}));
+})(ts || (ts = {}));
+/* @internal */
+var ts;
+(function (ts) {
+    function stringToInt(str) {
+        var n = parseInt(str, 10);
+        if (isNaN(n)) {
+            throw new Error("Error in parseInt(" + JSON.stringify(str) + ")");
+        }
+        return n;
+    }
+    var isPrereleaseRegex = /^(.*)-next.\d+/;
+    var prereleaseSemverRegex = /^(\d+)\.(\d+)\.0-next.(\d+)$/;
+    var semverRegex = /^(\d+)\.(\d+)\.(\d+)$/;
+    var Semver = /** @class */ (function () {
+        function Semver(major, minor, patch, 
+        /**
+         * If true, this is `major.minor.0-next.patch`.
+         * If false, this is `major.minor.patch`.
+         */
+        isPrerelease) {
+            this.major = major;
+            this.minor = minor;
+            this.patch = patch;
+            this.isPrerelease = isPrerelease;
+        }
+        Semver.parse = function (semver) {
+            var isPrerelease = isPrereleaseRegex.test(semver);
+            var result = Semver.tryParse(semver, isPrerelease);
+            if (!result) {
+                throw new Error("Unexpected semver: " + semver + " (isPrerelease: " + isPrerelease + ")");
+            }
+            return result;
+        };
+        Semver.fromRaw = function (_a) {
+            var major = _a.major, minor = _a.minor, patch = _a.patch, isPrerelease = _a.isPrerelease;
+            return new Semver(major, minor, patch, isPrerelease);
+        };
+        // This must parse the output of `versionString`.
+        Semver.tryParse = function (semver, isPrerelease) {
+            // Per the semver spec <http://semver.org/#spec-item-2>:
+            // "A normal version number MUST take the form X.Y.Z where X, Y, and Z are non-negative integers, and MUST NOT contain leading zeroes."
+            var rgx = isPrerelease ? prereleaseSemverRegex : semverRegex;
+            var match = rgx.exec(semver);
+            return match ? new Semver(stringToInt(match[1]), stringToInt(match[2]), stringToInt(match[3]), isPrerelease) : undefined;
+        };
+        Object.defineProperty(Semver.prototype, "versionString", {
+            get: function () {
+                return this.isPrerelease ? this.major + "." + this.minor + ".0-next." + this.patch : this.major + "." + this.minor + "." + this.patch;
+            },
+            enumerable: true,
+            configurable: true
+        });
+        Semver.prototype.equals = function (sem) {
+            return this.major === sem.major && this.minor === sem.minor && this.patch === sem.patch && this.isPrerelease === sem.isPrerelease;
+        };
+        Semver.prototype.greaterThan = function (sem) {
+            return this.major > sem.major || this.major === sem.major
+                && (this.minor > sem.minor || this.minor === sem.minor
+                    && (!this.isPrerelease && sem.isPrerelease || this.isPrerelease === sem.isPrerelease
+                        && this.patch > sem.patch));
+        };
+        return Semver;
+    }());
+    ts.Semver = Semver;
+})(ts || (ts = {}));
+//# sourceMappingURL=jsTyping.js.map
+"use strict";
+var __assign = (this && this.__assign) || Object.assign || function(t) {
+    for (var s, i = 1, n = arguments.length; i < n; i++) {
+        s = arguments[i];
+        for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
+            t[p] = s[p];
+    }
+    return t;
+};
+var __extends = (this && this.__extends) || (function () {
+    var extendStatics = Object.setPrototypeOf ||
+        ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
+        function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
+    return function (d, b) {
+        extendStatics(d, b);
+        function __() { this.constructor = d; }
+        d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
+    };
+})();
 var ts;
 (function (ts) {
     var ScriptSnapshot;
@@ -85441,8 +87478,8 @@ var ts;
      * Gets the token whose text has range [start, end) and
      * position >= start and (position < end or (position === end && token is literal or keyword or identifier))
      */
-    function getTouchingPropertyName(sourceFile, position, includeJsDocComment) {
-        return getTouchingToken(sourceFile, position, includeJsDocComment, function (n) { return ts.isPropertyNameLiteral(n) || ts.isKeyword(n.kind); });
+    function getTouchingPropertyName(sourceFile, position) {
+        return getTouchingToken(sourceFile, position, /*includeJsDocComment*/ true, function (n) { return ts.isPropertyNameLiteral(n) || ts.isKeyword(n.kind); });
     }
     ts.getTouchingPropertyName = getTouchingPropertyName;
     /**
@@ -85519,8 +87556,8 @@ var ts;
                 return n;
             }
             var children = n.getChildren();
-            for (var _i = 0, children_3 = children; _i < children_3.length; _i++) {
-                var child = children_3[_i];
+            for (var _i = 0, children_1 = children; _i < children_1.length; _i++) {
+                var child = children_1[_i];
                 var shouldDiveInChildNode = 
                 // previous token is enclosed somewhere in the child
                 (child.pos <= previousToken.pos && child.end > previousToken.end) ||
@@ -85995,18 +88032,37 @@ var ts;
         return ts.createGetCanonicalFileName(hostUsesCaseSensitiveFileNames(host));
     }
     ts.hostGetCanonicalFileName = hostGetCanonicalFileName;
-    function makeImportIfNecessary(defaultImport, namedImports, moduleSpecifier, preferences) {
-        return defaultImport || namedImports && namedImports.length ? makeImport(defaultImport, namedImports, moduleSpecifier, preferences) : undefined;
+    function makeImportIfNecessary(defaultImport, namedImports, moduleSpecifier, quotePreference) {
+        return defaultImport || namedImports && namedImports.length ? makeImport(defaultImport, namedImports, moduleSpecifier, quotePreference) : undefined;
     }
     ts.makeImportIfNecessary = makeImportIfNecessary;
-    function makeImport(defaultImport, namedImports, moduleSpecifier, preferences) {
+    function makeImport(defaultImport, namedImports, moduleSpecifier, quotePreference) {
         return ts.createImportDeclaration(
         /*decorators*/ undefined, 
         /*modifiers*/ undefined, defaultImport || namedImports
             ? ts.createImportClause(defaultImport, namedImports && namedImports.length ? ts.createNamedImports(namedImports) : undefined)
-            : undefined, typeof moduleSpecifier === "string" ? ts.createLiteral(moduleSpecifier, preferences.quotePreference === "single") : moduleSpecifier);
+            : undefined, typeof moduleSpecifier === "string" ? makeStringLiteral(moduleSpecifier, quotePreference) : moduleSpecifier);
     }
     ts.makeImport = makeImport;
+    function makeStringLiteral(text, quotePreference) {
+        return ts.createLiteral(text, quotePreference === 0 /* Single */);
+    }
+    ts.makeStringLiteral = makeStringLiteral;
+    var QuotePreference;
+    (function (QuotePreference) {
+        QuotePreference[QuotePreference["Single"] = 0] = "Single";
+        QuotePreference[QuotePreference["Double"] = 1] = "Double";
+    })(QuotePreference = ts.QuotePreference || (ts.QuotePreference = {}));
+    function getQuotePreference(sourceFile, preferences) {
+        if (preferences.quotePreference) {
+            return preferences.quotePreference === "single" ? 0 /* Single */ : 1 /* Double */;
+        }
+        else {
+            var firstModuleSpecifier = ts.firstOrUndefined(sourceFile.imports);
+            return !!firstModuleSpecifier && !ts.isStringDoubleQuoted(firstModuleSpecifier, sourceFile) ? 0 /* Single */ : 1 /* Double */;
+        }
+    }
+    ts.getQuotePreference = getQuotePreference;
     function symbolNameNoDefault(symbol) {
         var escaped = symbolEscapedNameNoDefault(symbol);
         return escaped === undefined ? undefined : ts.unescapeLeadingUnderscores(escaped);
@@ -86364,14 +88420,14 @@ var ts;
         var visited = ts.visitEachChild(node, getSynthesizedDeepClone, ts.nullTransformationContext);
         if (visited === node) {
             // This only happens for leaf nodes - internal nodes always see their children change.
-            var clone_7 = ts.getSynthesizedClone(node);
-            if (ts.isStringLiteral(clone_7)) {
-                clone_7.textSourceNode = node;
+            var clone_1 = ts.getSynthesizedClone(node);
+            if (ts.isStringLiteral(clone_1)) {
+                clone_1.textSourceNode = node;
             }
-            else if (ts.isNumericLiteral(clone_7)) {
-                clone_7.numericLiteralFlags = node.numericLiteralFlags;
+            else if (ts.isNumericLiteral(clone_1)) {
+                clone_1.numericLiteralFlags = node.numericLiteralFlags;
             }
-            return ts.setTextRange(clone_7, node);
+            return ts.setTextRange(clone_1, node);
         }
         // PERF: As an optimization, rather than calling getSynthesizedClone, we'll update
         // the new node created by visitEachChild with the extra changes getSynthesizedClone
@@ -86712,7 +88768,7 @@ var ts;
         var lastEnd = 0;
         for (var i = 0; i < dense.length; i += 3) {
             var start = dense[i];
-            var length_5 = dense[i + 1];
+            var length_1 = dense[i + 1];
             var type = dense[i + 2];
             // Make a whitespace entry between the last item and this one.
             if (lastEnd >= 0) {
@@ -86721,8 +88777,8 @@ var ts;
                     entries.push({ length: whitespaceLength_1, classification: ts.TokenClass.Whitespace });
                 }
             }
-            entries.push({ length: length_5, classification: convertClassification(type) });
-            lastEnd = start + length_5;
+            entries.push({ length: length_1, classification: convertClassification(type) });
+            lastEnd = start + length_1;
         }
         var whitespaceLength = text.length - lastEnd;
         if (whitespaceLength > 0) {
@@ -87454,8 +89510,8 @@ var ts;
                          * both foo.ts and foo.tsx become foo
                          */
                         var foundFiles = ts.createMap();
-                        for (var _i = 0, files_3 = files; _i < files_3.length; _i++) {
-                            var filePath = files_3[_i];
+                        for (var _i = 0, files_1 = files; _i < files_1.length; _i++) {
+                            var filePath = files_1[_i];
                             filePath = ts.normalizePath(filePath);
                             if (exclude && ts.comparePaths(filePath, exclude, scriptPath, ignoreCase) === 0 /* EqualTo */) {
                                 continue;
@@ -87473,8 +89529,8 @@ var ts;
                     var directories = tryGetDirectories(host, baseDirectory);
                     if (directories) {
                         for (var _a = 0, directories_1 = directories; _a < directories_1.length; _a++) {
-                            var directory_2 = directories_1[_a];
-                            var directoryName = ts.getBaseFileName(ts.normalizePath(directory_2));
+                            var directory = directories_1[_a];
+                            var directoryName = ts.getBaseFileName(ts.normalizePath(directory));
                             if (directoryName !== "@types") {
                                 result.push(nameAndKind(directoryName, "directory" /* directory */));
                             }
@@ -87501,7 +89557,7 @@ var ts;
                     for (var path in paths) {
                         var patterns = paths[path];
                         if (paths.hasOwnProperty(path) && patterns) {
-                            var _loop_12 = function (name, kind) {
+                            var _loop_1 = function (name, kind) {
                                 // Path mappings may provide a duplicate way to get to something we've already added, so don't add again.
                                 if (!result.some(function (entry) { return entry.name === name; })) {
                                     result.push(nameAndKind(name, kind));
@@ -87509,7 +89565,7 @@ var ts;
                             };
                             for (var _i = 0, _a = getCompletionsForPathMapping(path, patterns, fragment, baseUrl, fileExtensions, host); _i < _a.length; _i++) {
                                 var _b = _a[_i], name = _b.name, kind = _b.kind;
-                                _loop_12(name, kind);
+                                _loop_1(name, kind);
                             }
                         }
                     }
@@ -87525,7 +89581,7 @@ var ts;
                     // (But do if we didn't find anything, e.g. 'package.json' missing.)
                     var foundGlobal = false;
                     if (fragmentDirectory === undefined) {
-                        var _loop_13 = function (moduleName) {
+                        var _loop_2 = function (moduleName) {
                             if (!result.some(function (entry) { return entry.name === moduleName; })) {
                                 foundGlobal = true;
                                 result.push(nameAndKind(moduleName, "external module name" /* externalModuleName */));
@@ -87533,7 +89589,7 @@ var ts;
                         };
                         for (var _e = 0, _f = enumerateNodeModulesVisibleToScript(host, scriptPath); _e < _f.length; _e++) {
                             var moduleName = _f[_e];
-                            _loop_13(moduleName);
+                            _loop_2(moduleName);
                         }
                     }
                     if (!foundGlobal) {
@@ -87651,8 +89707,8 @@ var ts;
                     }
                     catch ( /* Wrap in try catch because getEffectiveTypeRoots touches the filesystem */_b) { /* Wrap in try catch because getEffectiveTypeRoots touches the filesystem */ }
                     if (typeRoots) {
-                        for (var _c = 0, typeRoots_2 = typeRoots; _c < typeRoots_2.length; _c++) {
-                            var root = typeRoots_2[_c];
+                        for (var _c = 0, typeRoots_1 = typeRoots; _c < typeRoots_1.length; _c++) {
+                            var root = typeRoots_1[_c];
                             getCompletionEntriesFromDirectories(root);
                         }
                     }
@@ -87875,7 +89931,7 @@ var ts;
             return { isGlobalCompletion: false, isMemberCompletion: false, isNewIdentifierLocation: false, entries: entries };
         }
         function completionInfoFromData(sourceFile, typeChecker, compilerOptions, log, completionData, preferences) {
-            var symbols = completionData.symbols, completionKind = completionData.completionKind, isInSnippetScope = completionData.isInSnippetScope, isNewIdentifierLocation = completionData.isNewIdentifierLocation, location = completionData.location, propertyAccessToConvert = completionData.propertyAccessToConvert, keywordFilters = completionData.keywordFilters, symbolToOriginInfoMap = completionData.symbolToOriginInfoMap, recommendedCompletion = completionData.recommendedCompletion, isJsxInitializer = completionData.isJsxInitializer;
+            var symbols = completionData.symbols, completionKind = completionData.completionKind, isInSnippetScope = completionData.isInSnippetScope, isNewIdentifierLocation = completionData.isNewIdentifierLocation, location = completionData.location, propertyAccessToConvert = completionData.propertyAccessToConvert, keywordFilters = completionData.keywordFilters, literals = completionData.literals, symbolToOriginInfoMap = completionData.symbolToOriginInfoMap, recommendedCompletion = completionData.recommendedCompletion, isJsxInitializer = completionData.isJsxInitializer;
             if (sourceFile.languageVariant === 1 /* JSX */ && location && location.parent && ts.isJsxClosingElement(location.parent)) {
                 // In the TypeScript JSX element, if such element is not defined. When users query for completion at closing tag,
                 // instead of simply giving unknown value, the completion will return the tag-name of an associated opening-element.
@@ -87910,6 +89966,10 @@ var ts;
             if (keywordFilters !== 0 /* None */ || !isMemberCompletion) {
                 ts.addRange(entries, getKeywordCompletions(keywordFilters));
             }
+            for (var _i = 0, literals_1 = literals; _i < literals_1.length; _i++) {
+                var literal = literals_1[_i];
+                entries.push(createCompletionEntryForLiteral(literal));
+            }
             return { isGlobalCompletion: isInSnippetScope, isMemberCompletion: isMemberCompletion, isNewIdentifierLocation: isNewIdentifierLocation, entries: entries };
         }
         function isUncheckedFile(sourceFile, compilerOptions) {
@@ -87942,6 +90002,10 @@ var ts;
                 }
             });
         }
+        var completionNameForLiteral = JSON.stringify;
+        function createCompletionEntryForLiteral(literal) {
+            return { name: completionNameForLiteral(literal), kind: "string" /* string */, kindModifiers: "" /* none */, sortText: "0" };
+        }
         function createCompletionEntry(symbol, location, sourceFile, typeChecker, target, kind, origin, recommendedCompletion, propertyAccessToConvert, isJsxInitializer, preferences) {
             var info = getCompletionEntryDisplayNameForSymbol(symbol, target, origin, kind);
             if (!info) {
@@ -88021,8 +90085,8 @@ var ts;
             // Based on the order we add things we will always see locals first, then globals, then module exports.
             // So adding a completion for a local will prevent us from adding completions for external module exports sharing the same name.
             var uniques = ts.createMap();
-            for (var _i = 0, symbols_4 = symbols; _i < symbols_4.length; _i++) {
-                var symbol = symbols_4[_i];
+            for (var _i = 0, symbols_1 = symbols; _i < symbols_1.length; _i++) {
+                var symbol = symbols_1[_i];
                 var origin = symbolToOriginInfoMap ? symbolToOriginInfoMap[ts.getSymbolId(symbol)] : undefined;
                 var entry = createCompletionEntry(symbol, location, sourceFile, typeChecker, target, kind, origin, recommendedCompletion, propertyAccessToConvert, isJsxInitializer, preferences);
                 if (!entry) {
@@ -88082,7 +90146,7 @@ var ts;
                 case 178 /* LiteralType */:
                     switch (node.parent.parent.kind) {
                         case 162 /* TypeReference */:
-                            return { kind: 2 /* Types */, types: getStringLiteralTypes(typeChecker.getTypeArgumentConstraint(node.parent), typeChecker), isNewIdentifier: false };
+                            return { kind: 2 /* Types */, types: getStringLiteralTypes(typeChecker.getTypeArgumentConstraint(node.parent)), isNewIdentifier: false };
                         case 176 /* IndexedAccessType */:
                             // Get all apparent property names
                             // i.e. interface Foo {
@@ -88152,7 +90216,7 @@ var ts;
             function fromContextualType() {
                 // Get completion for string literal from string literal type
                 // i.e. var x: "hi" | "hello" = "/*completion position*/"
-                return { kind: 2 /* Types */, types: getStringLiteralTypes(getContextualTypeFromParent(node, typeChecker), typeChecker), isNewIdentifier: false };
+                return { kind: 2 /* Types */, types: getStringLiteralTypes(getContextualTypeFromParent(node, typeChecker)), isNewIdentifier: false };
             }
         }
         function getStringLiteralCompletionsFromSignature(argumentInfo, checker) {
@@ -88165,20 +90229,20 @@ var ts;
                     return;
                 var type = checker.getParameterType(candidate, argumentInfo.argumentIndex);
                 isNewIdentifier = isNewIdentifier || !!(type.flags & 4 /* String */);
-                return getStringLiteralTypes(type, checker, uniques);
+                return getStringLiteralTypes(type, uniques);
             });
             return { kind: 2 /* Types */, types: types, isNewIdentifier: isNewIdentifier };
         }
         function stringLiteralCompletionsFromProperties(type) {
             return type && { kind: 1 /* Properties */, symbols: type.getApparentProperties(), hasIndexSignature: hasIndexSignature(type) };
         }
-        function getStringLiteralTypes(type, typeChecker, uniques) {
+        function getStringLiteralTypes(type, uniques) {
             if (uniques === void 0) { uniques = ts.createMap(); }
             if (!type)
                 return ts.emptyArray;
             type = ts.skipConstraint(type);
             return type.isUnion()
-                ? ts.flatMap(type.types, function (t) { return getStringLiteralTypes(t, typeChecker, uniques); })
+                ? ts.flatMap(type.types, function (t) { return getStringLiteralTypes(t, uniques); })
                 : type.isStringLiteral() && !(type.flags & 512 /* EnumLiteral */) && ts.addToSeen(uniques, type.value)
                     ? [type]
                     : ts.emptyArray;
@@ -88192,7 +90256,10 @@ var ts;
             if (completionData.kind !== 0 /* Data */) {
                 return { type: "request", request: completionData };
             }
-            var symbols = completionData.symbols, location = completionData.location, completionKind = completionData.completionKind, symbolToOriginInfoMap = completionData.symbolToOriginInfoMap, previousToken = completionData.previousToken, isJsxInitializer = completionData.isJsxInitializer;
+            var symbols = completionData.symbols, literals = completionData.literals, location = completionData.location, completionKind = completionData.completionKind, symbolToOriginInfoMap = completionData.symbolToOriginInfoMap, previousToken = completionData.previousToken, isJsxInitializer = completionData.isJsxInitializer;
+            var literal = ts.find(literals, function (l) { return completionNameForLiteral(l) === entryId.name; });
+            if (literal !== undefined)
+                return { type: "literal", literal: literal };
             // Find the symbol with the matching entry name.
             // We don't need to perform character checks here because we're only comparing the
             // name against 'entryName' (which is known to be good), not building a new
@@ -88244,12 +90311,21 @@ var ts;
                     var _a = getCompletionEntryCodeActionsAndSourceDisplay(symbolToOriginInfoMap, symbol, program, typeChecker, host, compilerOptions, sourceFile, previousToken, formatContext, getCanonicalFileName, program.getSourceFiles(), preferences), codeActions = _a.codeActions, sourceDisplay = _a.sourceDisplay;
                     return createCompletionDetailsForSymbol(symbol, typeChecker, sourceFile, location, cancellationToken, codeActions, sourceDisplay); // TODO: GH#18217
                 }
+                case "literal": {
+                    var literal = symbolCompletion.literal;
+                    return createSimpleDetails(completionNameForLiteral(literal), "string" /* string */, typeof literal === "string" ? ts.SymbolDisplayPartKind.stringLiteral : ts.SymbolDisplayPartKind.numericLiteral);
+                }
                 case "none":
                     // Didn't find a symbol with this name.  See if we can find a keyword instead.
-                    return allKeywordsCompletions().some(function (c) { return c.name === name; }) ? createCompletionDetails(name, "" /* none */, "keyword" /* keyword */, [ts.displayPart(name, ts.SymbolDisplayPartKind.keyword)]) : undefined;
+                    return allKeywordsCompletions().some(function (c) { return c.name === name; }) ? createSimpleDetails(name, "keyword" /* keyword */, ts.SymbolDisplayPartKind.keyword) : undefined;
+                default:
+                    ts.Debug.assertNever(symbolCompletion);
             }
         }
         Completions.getCompletionEntryDetails = getCompletionEntryDetails;
+        function createSimpleDetails(name, kind, kind2) {
+            return createCompletionDetails(name, "" /* none */, kind, [ts.displayPart(name, kind2)]);
+        }
         function createCompletionDetailsForSymbol(symbol, checker, sourceFile, location, cancellationToken, codeActions, sourceDisplay) {
             var _a = checker.runWithCancellationToken(cancellationToken, function (checker) {
                 return ts.SymbolDisplay.getSymbolDisplayPartsDocumentationAndSymbolKind(checker, symbol, sourceFile, location, location, 7 /* All */);
@@ -88306,22 +90382,21 @@ var ts;
             CompletionKind[CompletionKind["String"] = 4] = "String";
             CompletionKind[CompletionKind["None"] = 5] = "None";
         })(CompletionKind || (CompletionKind = {}));
-        function getRecommendedCompletion(currentToken, position, sourceFile, checker) {
-            var contextualType = getContextualType(currentToken, position, sourceFile, checker);
+        function getRecommendedCompletion(previousToken, contextualType, checker) {
             // For a union, return the first one with a recommended completion.
             return ts.firstDefined(contextualType && (contextualType.isUnion() ? contextualType.types : [contextualType]), function (type) {
                 var symbol = type && type.symbol;
                 // Don't include make a recommended completion for an abstract class
                 return symbol && (symbol.flags & (8 /* EnumMember */ | 384 /* Enum */ | 32 /* Class */) && !ts.isAbstractConstructorSymbol(symbol))
-                    ? getFirstSymbolInChain(symbol, currentToken, checker)
+                    ? getFirstSymbolInChain(symbol, previousToken, checker)
                     : undefined;
             });
         }
-        function getContextualType(currentToken, position, sourceFile, checker) {
-            var parent = currentToken.parent;
-            switch (currentToken.kind) {
+        function getContextualType(previousToken, position, sourceFile, checker) {
+            var parent = previousToken.parent;
+            switch (previousToken.kind) {
                 case 71 /* Identifier */:
-                    return getContextualTypeFromParent(currentToken, checker);
+                    return getContextualTypeFromParent(previousToken, checker);
                 case 58 /* EqualsToken */:
                     switch (parent.kind) {
                         case 232 /* VariableDeclaration */:
@@ -88340,14 +90415,14 @@ var ts;
                 case 17 /* OpenBraceToken */:
                     return ts.isJsxExpression(parent) && parent.parent.kind !== 255 /* JsxElement */ ? checker.getContextualTypeForJsxAttribute(parent.parent) : undefined;
                 default:
-                    var argInfo = ts.SignatureHelp.getArgumentInfoForCompletions(currentToken, position, sourceFile);
+                    var argInfo = ts.SignatureHelp.getArgumentInfoForCompletions(previousToken, position, sourceFile);
                     return argInfo
                         // At `,`, treat this as the next argument after the comma.
-                        ? checker.getContextualTypeForArgumentAtIndex(argInfo.invocation, argInfo.argumentIndex + (currentToken.kind === 26 /* CommaToken */ ? 1 : 0))
-                        : isEqualityOperatorKind(currentToken.kind) && ts.isBinaryExpression(parent) && isEqualityOperatorKind(parent.operatorToken.kind)
+                        ? checker.getContextualTypeForArgumentAtIndex(argInfo.invocation, argInfo.argumentIndex + (previousToken.kind === 26 /* CommaToken */ ? 1 : 0))
+                        : isEqualityOperatorKind(previousToken.kind) && ts.isBinaryExpression(parent) && isEqualityOperatorKind(parent.operatorToken.kind)
                             // completion at `x ===/**/` should be for the right side
                             ? checker.getTypeAtLocation(parent.left)
-                            : checker.getContextualType(currentToken);
+                            : checker.getContextualType(previousToken);
             }
         }
         function getContextualTypeFromParent(node, checker) {
@@ -88459,9 +90534,9 @@ var ts;
             // Check if the caret is at the end of an identifier; this is a partial identifier that we want to complete: e.g. a.toS|
             // Skip this partial identifier and adjust the contextToken to the token that precedes it.
             if (contextToken && position <= contextToken.end && (ts.isIdentifier(contextToken) || ts.isKeyword(contextToken.kind))) {
-                var start_4 = ts.timestamp();
+                var start_1 = ts.timestamp();
                 contextToken = ts.findPrecedingToken(contextToken.getFullStart(), sourceFile, /*startNode*/ undefined, insideJsDocTagTypeExpression); // TODO: GH#18217
-                log("getCompletionData: Get previous token 2: " + (ts.timestamp() - start_4));
+                log("getCompletionData: Get previous token 2: " + (ts.timestamp() - start_1));
             }
             // Find the node where completion is requested on.
             // Also determine whether we are trying to complete with members of that node
@@ -88472,7 +90547,7 @@ var ts;
             var isRightOfOpenTag = false;
             var isStartingCloseTag = false;
             var isJsxInitializer = false;
-            var location = ts.getTouchingPropertyName(sourceFile, position, insideJsDocTagTypeExpression); // TODO: GH#15853
+            var location = ts.getTouchingPropertyName(sourceFile, position);
             if (contextToken) {
                 // Bail out if this is a known invalid completion location
                 if (isCompletionListBlocker(contextToken)) {
@@ -88591,8 +90666,10 @@ var ts;
                 }
             }
             log("getCompletionData: Semantic work: " + (ts.timestamp() - semanticStart));
-            var recommendedCompletion = previousToken && getRecommendedCompletion(previousToken, position, sourceFile, typeChecker);
-            return { kind: 0 /* Data */, symbols: symbols, completionKind: completionKind, isInSnippetScope: isInSnippetScope, propertyAccessToConvert: propertyAccessToConvert, isNewIdentifierLocation: isNewIdentifierLocation, location: location, keywordFilters: keywordFilters, symbolToOriginInfoMap: symbolToOriginInfoMap, recommendedCompletion: recommendedCompletion, previousToken: previousToken, isJsxInitializer: isJsxInitializer };
+            var contextualType = previousToken && getContextualType(previousToken, position, sourceFile, typeChecker);
+            var literals = ts.mapDefined(contextualType && (contextualType.isUnion() ? contextualType.types : [contextualType]), function (t) { return t.isLiteral() ? t.value : undefined; });
+            var recommendedCompletion = previousToken && contextualType && getRecommendedCompletion(previousToken, contextualType, typeChecker);
+            return { kind: 0 /* Data */, symbols: symbols, completionKind: completionKind, isInSnippetScope: isInSnippetScope, propertyAccessToConvert: propertyAccessToConvert, isNewIdentifierLocation: isNewIdentifierLocation, location: location, keywordFilters: keywordFilters, literals: literals, symbolToOriginInfoMap: symbolToOriginInfoMap, recommendedCompletion: recommendedCompletion, previousToken: previousToken, isJsxInitializer: isJsxInitializer };
             function isTagWithTypeExpression(tag) {
                 switch (tag.kind) {
                     case 293 /* JSDocParameterTag */:
@@ -88627,9 +90704,9 @@ var ts;
                                 function (symbol) { return isValidTypeAccess_1(symbol) || isValidValueAccess_1(symbol); } :
                                 isTypeLocation ? isValidTypeAccess_1 : isValidValueAccess_1;
                             for (var _i = 0, exportedSymbols_1 = exportedSymbols; _i < exportedSymbols_1.length; _i++) {
-                                var symbol_2 = exportedSymbols_1[_i];
-                                if (isValidAccess(symbol_2)) {
-                                    symbols.push(symbol_2);
+                                var symbol_1 = exportedSymbols_1[_i];
+                                if (isValidAccess(symbol_1)) {
+                                    symbols.push(symbol_1);
                                 }
                             }
                             // If the module is merged with a value, we must get the type of the class and add its propertes (for inherited static methods).
@@ -88650,7 +90727,7 @@ var ts;
                 }
             }
             function addTypeProperties(type) {
-                isNewIdentifierLocation = hasIndexSignature(type);
+                isNewIdentifierLocation = !!type.getStringIndexType();
                 if (isUncheckedFile) {
                     // In javascript files, for union types, we don't just get the members that
                     // the individual types have in common, we also include all the members that
@@ -89716,7 +91793,7 @@ var ts;
     var DocumentHighlights;
     (function (DocumentHighlights) {
         function getDocumentHighlights(program, cancellationToken, sourceFile, position, sourceFilesToSearch) {
-            var node = ts.getTouchingPropertyName(sourceFile, position, /*includeJsDocComment*/ true);
+            var node = ts.getTouchingPropertyName(sourceFile, position);
             if (node.parent && (ts.isJsxOpeningElement(node.parent) && node.parent.tagName === node || ts.isJsxClosingElement(node.parent))) {
                 // For a JSX element, just highlight the matching tag, not all references.
                 var _a = node.parent.parent, openingElement = _a.openingElement, closingElement = _a.closingElement;
@@ -90580,8 +92657,8 @@ var ts;
         function findModuleReferences(program, sourceFiles, searchModuleSymbol) {
             var refs = [];
             var checker = program.getTypeChecker();
-            for (var _i = 0, sourceFiles_5 = sourceFiles; _i < sourceFiles_5.length; _i++) {
-                var referencingFile = sourceFiles_5[_i];
+            for (var _i = 0, sourceFiles_1 = sourceFiles; _i < sourceFiles_1.length; _i++) {
+                var referencingFile = sourceFiles_1[_i];
                 var searchSourceFile = searchModuleSymbol.valueDeclaration;
                 if (searchSourceFile.kind === 274 /* SourceFile */) {
                     for (var _a = 0, _b = referencingFile.referencedFiles; _a < _b.length; _a++) {
@@ -90611,8 +92688,8 @@ var ts;
         /** Returns a map from a module symbol Id to all import statements that directly reference the module. */
         function getDirectImportsMap(sourceFiles, checker, cancellationToken) {
             var map = ts.createMap();
-            for (var _i = 0, sourceFiles_6 = sourceFiles; _i < sourceFiles_6.length; _i++) {
-                var sourceFile = sourceFiles_6[_i];
+            for (var _i = 0, sourceFiles_2 = sourceFiles; _i < sourceFiles_2.length; _i++) {
+                var sourceFile = sourceFiles_2[_i];
                 cancellationToken.throwIfCancellationRequested();
                 forEachImport(sourceFile, function (importDecl, moduleSpecifier) {
                     var moduleSymbol = checker.getSymbolAtLocation(moduleSpecifier);
@@ -90880,7 +92957,7 @@ var ts;
         }
         FindAllReferences.nodeEntry = nodeEntry;
         function findReferencedSymbols(program, cancellationToken, sourceFiles, sourceFile, position) {
-            var node = ts.getTouchingPropertyName(sourceFile, position, /*includeJsDocComment*/ true);
+            var node = ts.getTouchingPropertyName(sourceFile, position);
             var referencedSymbols = FindAllReferences.Core.getReferencedSymbolsForNode(position, node, program, sourceFiles, cancellationToken);
             var checker = program.getTypeChecker();
             return !referencedSymbols || !referencedSymbols.length ? undefined : ts.mapDefined(referencedSymbols, function (_a) {
@@ -90894,8 +92971,7 @@ var ts;
         }
         FindAllReferences.findReferencedSymbols = findReferencedSymbols;
         function getImplementationsAtPosition(program, cancellationToken, sourceFiles, sourceFile, position) {
-            // A node in a JSDoc comment can't have an implementation anyway.
-            var node = ts.getTouchingPropertyName(sourceFile, position, /*includeJsDocComment*/ false);
+            var node = ts.getTouchingPropertyName(sourceFile, position);
             var referenceEntries = getImplementationReferenceEntries(program, cancellationToken, sourceFiles, node, position);
             var checker = program.getTypeChecker();
             return ts.map(referenceEntries, function (entry) { return toImplementationLocation(entry, checker); });
@@ -90909,9 +92985,9 @@ var ts;
             // If invoked directly on a shorthand property assignment, then return
             // the declaration of the symbol being assigned (not the symbol being assigned to).
             if (node.parent.kind === 271 /* ShorthandPropertyAssignment */) {
-                var result_5 = [];
-                FindAllReferences.Core.getReferenceEntriesForShorthandPropertyAssignment(node, checker, function (node) { return result_5.push(nodeEntry(node)); });
-                return result_5;
+                var result_1 = [];
+                FindAllReferences.Core.getReferenceEntriesForShorthandPropertyAssignment(node, checker, function (node) { return result_1.push(nodeEntry(node)); });
+                return result_1;
             }
             else if (node.kind === 97 /* SuperKeyword */ || ts.isSuperProperty(node.parent)) {
                 // References to and accesses on the super keyword only have one possible implementation, so no
@@ -90925,7 +93001,7 @@ var ts;
             }
         }
         function findReferencedEntries(program, cancellationToken, sourceFiles, sourceFile, position, options) {
-            var node = ts.getTouchingPropertyName(sourceFile, position, /*includeJsDocComment*/ true);
+            var node = ts.getTouchingPropertyName(sourceFile, position);
             return ts.map(flattenEntries(FindAllReferences.Core.getReferencedSymbolsForNode(position, node, program, sourceFiles, cancellationToken, options)), toReferenceEntry);
         }
         FindAllReferences.findReferencedEntries = findReferencedEntries;
@@ -90944,27 +93020,27 @@ var ts;
                     case "symbol": {
                         var symbol = def.symbol;
                         var _a = getDefinitionKindAndDisplayParts(symbol, checker, originalNode), displayParts_1 = _a.displayParts, kind_1 = _a.kind;
-                        var name_3 = displayParts_1.map(function (p) { return p.text; }).join("");
-                        return { node: symbol.declarations ? ts.getNameOfDeclaration(ts.first(symbol.declarations)) || ts.first(symbol.declarations) : originalNode, name: name_3, kind: kind_1, displayParts: displayParts_1 };
+                        var name_1 = displayParts_1.map(function (p) { return p.text; }).join("");
+                        return { node: symbol.declarations ? ts.getNameOfDeclaration(ts.first(symbol.declarations)) || ts.first(symbol.declarations) : originalNode, name: name_1, kind: kind_1, displayParts: displayParts_1 };
                     }
                     case "label": {
-                        var node_3 = def.node;
-                        return { node: node_3, name: node_3.text, kind: "label" /* label */, displayParts: [ts.displayPart(node_3.text, ts.SymbolDisplayPartKind.text)] };
+                        var node_1 = def.node;
+                        return { node: node_1, name: node_1.text, kind: "label" /* label */, displayParts: [ts.displayPart(node_1.text, ts.SymbolDisplayPartKind.text)] };
                     }
                     case "keyword": {
-                        var node_4 = def.node;
-                        var name_4 = ts.tokenToString(node_4.kind);
-                        return { node: node_4, name: name_4, kind: "keyword" /* keyword */, displayParts: [{ text: name_4, kind: "keyword" /* keyword */ }] };
+                        var node_2 = def.node;
+                        var name_2 = ts.tokenToString(node_2.kind);
+                        return { node: node_2, name: name_2, kind: "keyword" /* keyword */, displayParts: [{ text: name_2, kind: "keyword" /* keyword */ }] };
                     }
                     case "this": {
-                        var node_5 = def.node;
-                        var symbol = checker.getSymbolAtLocation(node_5);
-                        var displayParts_2 = symbol && ts.SymbolDisplay.getSymbolDisplayPartsDocumentationAndSymbolKind(checker, symbol, node_5.getSourceFile(), ts.getContainerNode(node_5), node_5).displayParts || [ts.textPart("this")];
-                        return { node: node_5, name: "this", kind: "var" /* variableElement */, displayParts: displayParts_2 };
+                        var node_3 = def.node;
+                        var symbol = checker.getSymbolAtLocation(node_3);
+                        var displayParts_2 = symbol && ts.SymbolDisplay.getSymbolDisplayPartsDocumentationAndSymbolKind(checker, symbol, node_3.getSourceFile(), ts.getContainerNode(node_3), node_3).displayParts || [ts.textPart("this")];
+                        return { node: node_3, name: "this", kind: "var" /* variableElement */, displayParts: displayParts_2 };
                     }
                     case "string": {
-                        var node_6 = def.node;
-                        return { node: node_6, name: node_6.text, kind: "var" /* variableElement */, displayParts: [ts.displayPart(ts.getTextOfNode(node_6), ts.SymbolDisplayPartKind.stringLiteral)] };
+                        var node_4 = def.node;
+                        return { node: node_4, name: node_4.text, kind: "var" /* variableElement */, displayParts: [ts.displayPart(ts.getTextOfNode(node_4), ts.SymbolDisplayPartKind.stringLiteral)] };
                     }
                     default:
                         return ts.Debug.assertNever(def);
@@ -91329,8 +93405,8 @@ var ts;
                     var sourceId = ts.getNodeId(sourceFile);
                     var seenSymbols = this.sourceFileToSeenSymbols[sourceId] || (this.sourceFileToSeenSymbols[sourceId] = ts.createMap());
                     var anyNewSymbols = false;
-                    for (var _i = 0, symbols_5 = symbols; _i < symbols_5.length; _i++) {
-                        var sym = symbols_5[_i];
+                    for (var _i = 0, symbols_2 = symbols; _i < symbols_2.length; _i++) {
+                        var sym = symbols_2[_i];
                         anyNewSymbols = ts.addToSeen(seenSymbols, ts.getSymbolId(sym)) || anyNewSymbols;
                     }
                     return anyNewSymbols;
@@ -91463,8 +93539,8 @@ var ts;
                     return undefined;
                 }
                 var scope;
-                for (var _i = 0, declarations_10 = declarations; _i < declarations_10.length; _i++) {
-                    var declaration = declarations_10[_i];
+                for (var _i = 0, declarations_1 = declarations; _i < declarations_1.length; _i++) {
+                    var declaration = declarations_1[_i];
                     var container = ts.getContainerNode(declaration);
                     if (scope && scope !== container) {
                         // Different declarations have different containers, bail out
@@ -91511,7 +93587,7 @@ var ts;
             Core.eachSymbolReferenceInFile = eachSymbolReferenceInFile;
             function getPossibleSymbolReferenceNodes(sourceFile, symbolName, container) {
                 if (container === void 0) { container = sourceFile; }
-                return getPossibleSymbolReferencePositions(sourceFile, symbolName, container).map(function (pos) { return ts.getTouchingPropertyName(sourceFile, pos, /*includeJsDocComment*/ true); });
+                return getPossibleSymbolReferencePositions(sourceFile, symbolName, container).map(function (pos) { return ts.getTouchingPropertyName(sourceFile, pos); });
             }
             function getPossibleSymbolReferencePositions(sourceFile, symbolName, container) {
                 if (container === void 0) { container = sourceFile; }
@@ -91601,7 +93677,7 @@ var ts;
                 return !!(ts.getMeaningFromLocation(referenceLocation) & state.searchMeaning);
             }
             function getReferencesAtLocation(sourceFile, position, search, state, addReferencesHere) {
-                var referenceLocation = ts.getTouchingPropertyName(sourceFile, position, /*includeJsDocComment*/ true);
+                var referenceLocation = ts.getTouchingPropertyName(sourceFile, position);
                 if (!isValidReferencePosition(referenceLocation, search.text)) {
                     // This wasn't the start of a token.  Check to see if it might be a
                     // match in a comment or string if that's what the caller is asking
@@ -92160,8 +94236,8 @@ var ts;
                         // To achieve that we will keep iterating until the result stabilizes.
                         // Remember the last meaning
                         lastIterationMeaning = meaning;
-                        for (var _i = 0, declarations_11 = declarations; _i < declarations_11.length; _i++) {
-                            var declaration = declarations_11[_i];
+                        for (var _i = 0, declarations_2 = declarations; _i < declarations_2.length; _i++) {
+                            var declaration = declarations_2[_i];
                             var declarationMeaning = ts.getMeaningFromDeclaration(declaration);
                             if (declarationMeaning & meaning) {
                                 meaning |= declarationMeaning;
@@ -92292,8 +94368,8 @@ var ts;
             // Type annotation needed due to #7294
             var elements = ts.isArrayLiteralExpression(property.initializer) ? property.initializer.elements : [property.initializer];
             var foundExactMatch = false;
-            for (var _i = 0, elements_5 = elements; _i < elements_5.length; _i++) {
-                var element = elements_5[_i];
+            for (var _i = 0, elements_1 = elements; _i < elements_1.length; _i++) {
+                var element = elements_1[_i];
                 foundExactMatch = tryUpdateString(element) || foundExactMatch;
             }
             return foundExactMatch;
@@ -92314,7 +94390,7 @@ var ts;
         }
     }
     function updateImports(program, changeTracker, oldToNew, newToOld, host, getCanonicalFileName, preferences) {
-        var _loop_14 = function (sourceFile) {
+        var _loop_3 = function (sourceFile) {
             var newImportFromPath = oldToNew(sourceFile.fileName) || sourceFile.fileName;
             var newImportFromDirectory = ts.getDirectoryPath(newImportFromPath);
             var oldFromNew = newToOld(sourceFile.fileName);
@@ -92332,12 +94408,12 @@ var ts;
                     // TODO:GH#18217
                     ? getSourceFileToImportFromResolved(ts.resolveModuleName(importLiteral.text, oldImportFromPath, program.getCompilerOptions(), host), oldToNew, program)
                     : getSourceFileToImport(importLiteral, sourceFile, program, host, oldToNew);
-                return toImport === undefined ? undefined : ts.moduleSpecifiers.getModuleSpecifier(program, sourceFile, newImportFromPath, toImport, host, preferences);
+                return toImport === undefined ? undefined : ts.moduleSpecifiers.getModuleSpecifier(program.getCompilerOptions(), sourceFile, newImportFromPath, toImport, host, preferences);
             });
         };
         for (var _i = 0, _a = program.getSourceFiles(); _i < _a.length; _i++) {
             var sourceFile = _a[_i];
-            _loop_14(sourceFile);
+            _loop_3(sourceFile);
         }
     }
     function combineNormal(pathA, pathB) {
@@ -92408,7 +94484,7 @@ var ts;
             if (reference) {
                 return [getDefinitionInfoForFileReference(reference.fileName, reference.file.fileName)];
             }
-            var node = ts.getTouchingPropertyName(sourceFile, position, /*includeJsDocComment*/ true);
+            var node = ts.getTouchingPropertyName(sourceFile, position);
             if (node === sourceFile) {
                 return undefined;
             }
@@ -92430,11 +94506,16 @@ var ts;
                 var sigInfo = createDefinitionFromSignatureDeclaration(typeChecker, calledDeclaration);
                 // For a function, if this is the original function definition, return just sigInfo.
                 // If this is the original constructor definition, parent is the class.
-                return typeChecker.getRootSymbols(symbol).some(function (s) { return calledDeclaration.symbol === s || calledDeclaration.symbol.parent === s; }) ||
+                if (typeChecker.getRootSymbols(symbol).some(function (s) { return calledDeclaration.symbol === s || calledDeclaration.symbol.parent === s; }) ||
                     // TODO: GH#23742 Following check shouldn't be necessary if 'require' is an alias
-                    symbol.declarations.some(function (d) { return ts.isVariableDeclaration(d) && !!d.initializer && ts.isRequireCall(d.initializer, /*checkArgumentIsStringLiteralLike*/ false); })
-                    ? [sigInfo]
-                    : [sigInfo].concat(getDefinitionFromSymbol(typeChecker, symbol, node));
+                    symbol.declarations.some(function (d) { return ts.isVariableDeclaration(d) && !!d.initializer && ts.isRequireCall(d.initializer, /*checkArgumentIsStringLiteralLike*/ false); })) {
+                    return [sigInfo];
+                }
+                else {
+                    var defs = getDefinitionFromSymbol(typeChecker, symbol, node);
+                    // For a 'super()' call, put the signature first, else put the variable first.
+                    return node.kind === 97 /* SuperKeyword */ ? [sigInfo].concat(defs) : defs.concat([sigInfo]);
+                }
             }
             // Because name in short-hand property assignment has two different meanings: property name and property value,
             // using go-to-definition at such position should go to the variable declaration of the property value rather than
@@ -92487,21 +94568,26 @@ var ts;
         function getReferenceAtPosition(sourceFile, position, program) {
             var referencePath = findReferenceInPosition(sourceFile.referencedFiles, position);
             if (referencePath) {
-                var file_16 = ts.tryResolveScriptReference(program, sourceFile, referencePath);
-                return file_16 && { fileName: referencePath.fileName, file: file_16 };
+                var file = ts.tryResolveScriptReference(program, sourceFile, referencePath);
+                return file && { fileName: referencePath.fileName, file: file };
             }
             var typeReferenceDirective = findReferenceInPosition(sourceFile.typeReferenceDirectives, position);
             if (typeReferenceDirective) {
                 var reference = program.getResolvedTypeReferenceDirectives().get(typeReferenceDirective.fileName);
-                var file_17 = reference && program.getSourceFile(reference.resolvedFileName); // TODO:GH#18217
-                return file_17 && { fileName: typeReferenceDirective.fileName, file: file_17 };
+                var file = reference && program.getSourceFile(reference.resolvedFileName); // TODO:GH#18217
+                return file && { fileName: typeReferenceDirective.fileName, file: file };
+            }
+            var libReferenceDirective = findReferenceInPosition(sourceFile.libReferenceDirectives, position);
+            if (libReferenceDirective) {
+                var file = program.getLibFileFromReference(libReferenceDirective);
+                return file && { fileName: libReferenceDirective.fileName, file: file };
             }
             return undefined;
         }
         GoToDefinition.getReferenceAtPosition = getReferenceAtPosition;
         /// Goto type
         function getTypeDefinitionAtPosition(typeChecker, sourceFile, position) {
-            var node = ts.getTouchingPropertyName(sourceFile, position, /*includeJsDocComment*/ true);
+            var node = ts.getTouchingPropertyName(sourceFile, position);
             if (node === sourceFile) {
                 return undefined;
             }
@@ -92522,11 +94608,13 @@ var ts;
                 return undefined;
             }
             // Check if position is on triple slash reference.
-            var comment = findReferenceInPosition(sourceFile.referencedFiles, position) || findReferenceInPosition(sourceFile.typeReferenceDirectives, position);
+            var comment = findReferenceInPosition(sourceFile.referencedFiles, position) ||
+                findReferenceInPosition(sourceFile.typeReferenceDirectives, position) ||
+                findReferenceInPosition(sourceFile.libReferenceDirectives, position);
             if (comment) {
                 return { definitions: definitions, textSpan: ts.createTextSpanFromRange(comment) };
             }
-            var node = ts.getTouchingPropertyName(sourceFile, position, /*includeJsDocComment*/ true);
+            var node = ts.getTouchingPropertyName(sourceFile, position);
             var textSpan = ts.createTextSpan(node.getStart(), node.getWidth());
             return { definitions: definitions, textSpan: textSpan };
         }
@@ -93010,368 +95098,6 @@ var ts;
 })(ts || (ts = {}));
 /* @internal */
 var ts;
-(function (ts) {
-    function stringToInt(str) {
-        var n = parseInt(str, 10);
-        if (isNaN(n)) {
-            throw new Error("Error in parseInt(" + JSON.stringify(str) + ")");
-        }
-        return n;
-    }
-    var isPrereleaseRegex = /^(.*)-next.\d+/;
-    var prereleaseSemverRegex = /^(\d+)\.(\d+)\.0-next.(\d+)$/;
-    var semverRegex = /^(\d+)\.(\d+)\.(\d+)$/;
-    var Semver = /** @class */ (function () {
-        function Semver(major, minor, patch, 
-        /**
-         * If true, this is `major.minor.0-next.patch`.
-         * If false, this is `major.minor.patch`.
-         */
-        isPrerelease) {
-            this.major = major;
-            this.minor = minor;
-            this.patch = patch;
-            this.isPrerelease = isPrerelease;
-        }
-        Semver.parse = function (semver) {
-            var isPrerelease = isPrereleaseRegex.test(semver);
-            var result = Semver.tryParse(semver, isPrerelease);
-            if (!result) {
-                throw new Error("Unexpected semver: " + semver + " (isPrerelease: " + isPrerelease + ")");
-            }
-            return result;
-        };
-        Semver.fromRaw = function (_a) {
-            var major = _a.major, minor = _a.minor, patch = _a.patch, isPrerelease = _a.isPrerelease;
-            return new Semver(major, minor, patch, isPrerelease);
-        };
-        // This must parse the output of `versionString`.
-        Semver.tryParse = function (semver, isPrerelease) {
-            // Per the semver spec <http://semver.org/#spec-item-2>:
-            // "A normal version number MUST take the form X.Y.Z where X, Y, and Z are non-negative integers, and MUST NOT contain leading zeroes."
-            var rgx = isPrerelease ? prereleaseSemverRegex : semverRegex;
-            var match = rgx.exec(semver);
-            return match ? new Semver(stringToInt(match[1]), stringToInt(match[2]), stringToInt(match[3]), isPrerelease) : undefined;
-        };
-        Object.defineProperty(Semver.prototype, "versionString", {
-            get: function () {
-                return this.isPrerelease ? this.major + "." + this.minor + ".0-next." + this.patch : this.major + "." + this.minor + "." + this.patch;
-            },
-            enumerable: true,
-            configurable: true
-        });
-        Semver.prototype.equals = function (sem) {
-            return this.major === sem.major && this.minor === sem.minor && this.patch === sem.patch && this.isPrerelease === sem.isPrerelease;
-        };
-        Semver.prototype.greaterThan = function (sem) {
-            return this.major > sem.major || this.major === sem.major
-                && (this.minor > sem.minor || this.minor === sem.minor
-                    && (!this.isPrerelease && sem.isPrerelease || this.isPrerelease === sem.isPrerelease
-                        && this.patch > sem.patch));
-        };
-        return Semver;
-    }());
-    ts.Semver = Semver;
-})(ts || (ts = {}));
-/* @internal */
-var ts;
-(function (ts) {
-    var JsTyping;
-    (function (JsTyping) {
-        /* @internal */
-        function isTypingUpToDate(cachedTyping, availableTypingVersions) {
-            var availableVersion = ts.Semver.parse(ts.getProperty(availableTypingVersions, "ts" + ts.versionMajorMinor) || ts.getProperty(availableTypingVersions, "latest"));
-            return !availableVersion.greaterThan(cachedTyping.version);
-        }
-        JsTyping.isTypingUpToDate = isTypingUpToDate;
-        /* @internal */
-        JsTyping.nodeCoreModuleList = [
-            "assert",
-            "async_hooks",
-            "buffer",
-            "child_process",
-            "cluster",
-            "console",
-            "constants",
-            "crypto",
-            "dgram",
-            "dns",
-            "domain",
-            "events",
-            "fs",
-            "http",
-            "https",
-            "http2",
-            "inspector",
-            "net",
-            "os",
-            "path",
-            "perf_hooks",
-            "process",
-            "punycode",
-            "querystring",
-            "readline",
-            "repl",
-            "stream",
-            "string_decoder",
-            "timers",
-            "tls",
-            "tty",
-            "url",
-            "util",
-            "v8",
-            "vm",
-            "zlib"
-        ];
-        /* @internal */
-        JsTyping.nodeCoreModules = ts.arrayToSet(JsTyping.nodeCoreModuleList);
-        function loadSafeList(host, safeListPath) {
-            var result = ts.readConfigFile(safeListPath, function (path) { return host.readFile(path); });
-            return ts.createMapFromTemplate(result.config);
-        }
-        JsTyping.loadSafeList = loadSafeList;
-        function loadTypesMap(host, typesMapPath) {
-            var result = ts.readConfigFile(typesMapPath, function (path) { return host.readFile(path); });
-            if (result.config) {
-                return ts.createMapFromTemplate(result.config.simpleMap);
-            }
-            return undefined;
-        }
-        JsTyping.loadTypesMap = loadTypesMap;
-        /**
-         * @param host is the object providing I/O related operations.
-         * @param fileNames are the file names that belong to the same project
-         * @param projectRootPath is the path to the project root directory
-         * @param safeListPath is the path used to retrieve the safe list
-         * @param packageNameToTypingLocation is the map of package names to their cached typing locations and installed versions
-         * @param typeAcquisition is used to customize the typing acquisition process
-         * @param compilerOptions are used as a source for typing inference
-         */
-        function discoverTypings(host, log, fileNames, projectRootPath, safeList, packageNameToTypingLocation, typeAcquisition, unresolvedImports, typesRegistry) {
-            if (!typeAcquisition || !typeAcquisition.enable) {
-                return { cachedTypingPaths: [], newTypingNames: [], filesToWatch: [] };
-            }
-            // A typing name to typing file path mapping
-            var inferredTypings = ts.createMap();
-            // Only infer typings for .js and .jsx files
-            fileNames = ts.mapDefined(fileNames, function (fileName) {
-                var path = ts.normalizePath(fileName);
-                if (ts.hasJavaScriptFileExtension(path)) {
-                    return path;
-                }
-            });
-            var filesToWatch = [];
-            if (typeAcquisition.include)
-                addInferredTypings(typeAcquisition.include, "Explicitly included types");
-            var exclude = typeAcquisition.exclude || [];
-            // Directories to search for package.json, bower.json and other typing information
-            var possibleSearchDirs = ts.arrayToSet(fileNames, ts.getDirectoryPath);
-            possibleSearchDirs.set(projectRootPath, true);
-            possibleSearchDirs.forEach(function (_true, searchDir) {
-                var packageJsonPath = ts.combinePaths(searchDir, "package.json");
-                getTypingNamesFromJson(packageJsonPath, filesToWatch);
-                var bowerJsonPath = ts.combinePaths(searchDir, "bower.json");
-                getTypingNamesFromJson(bowerJsonPath, filesToWatch);
-                var bowerComponentsPath = ts.combinePaths(searchDir, "bower_components");
-                getTypingNamesFromPackagesFolder(bowerComponentsPath, filesToWatch);
-                var nodeModulesPath = ts.combinePaths(searchDir, "node_modules");
-                getTypingNamesFromPackagesFolder(nodeModulesPath, filesToWatch);
-            });
-            getTypingNamesFromSourceFileNames(fileNames);
-            // add typings for unresolved imports
-            if (unresolvedImports) {
-                var module_1 = ts.deduplicate(unresolvedImports.map(function (moduleId) { return JsTyping.nodeCoreModules.has(moduleId) ? "node" : moduleId; }), ts.equateStringsCaseSensitive, ts.compareStringsCaseSensitive);
-                addInferredTypings(module_1, "Inferred typings from unresolved imports");
-            }
-            // Add the cached typing locations for inferred typings that are already installed
-            packageNameToTypingLocation.forEach(function (typing, name) {
-                var registryEntry = typesRegistry.get(name);
-                if (inferredTypings.has(name) && inferredTypings.get(name) === undefined && registryEntry !== undefined && isTypingUpToDate(typing, registryEntry)) {
-                    inferredTypings.set(name, typing.typingLocation);
-                }
-            });
-            // Remove typings that the user has added to the exclude list
-            for (var _i = 0, exclude_1 = exclude; _i < exclude_1.length; _i++) {
-                var excludeTypingName = exclude_1[_i];
-                var didDelete = inferredTypings.delete(excludeTypingName);
-                if (didDelete && log)
-                    log("Typing for " + excludeTypingName + " is in exclude list, will be ignored.");
-            }
-            var newTypingNames = [];
-            var cachedTypingPaths = [];
-            inferredTypings.forEach(function (inferred, typing) {
-                if (inferred !== undefined) {
-                    cachedTypingPaths.push(inferred);
-                }
-                else {
-                    newTypingNames.push(typing);
-                }
-            });
-            var result = { cachedTypingPaths: cachedTypingPaths, newTypingNames: newTypingNames, filesToWatch: filesToWatch };
-            if (log)
-                log("Result: " + JSON.stringify(result));
-            return result;
-            function addInferredTyping(typingName) {
-                if (!inferredTypings.has(typingName)) {
-                    inferredTypings.set(typingName, undefined); // TODO: GH#18217
-                }
-            }
-            function addInferredTypings(typingNames, message) {
-                if (log)
-                    log(message + ": " + JSON.stringify(typingNames));
-                ts.forEach(typingNames, addInferredTyping);
-            }
-            /**
-             * Get the typing info from common package manager json files like package.json or bower.json
-             */
-            function getTypingNamesFromJson(jsonPath, filesToWatch) {
-                if (!host.fileExists(jsonPath)) {
-                    return;
-                }
-                filesToWatch.push(jsonPath);
-                var jsonConfig = ts.readConfigFile(jsonPath, function (path) { return host.readFile(path); }).config;
-                var jsonTypingNames = ts.flatMap([jsonConfig.dependencies, jsonConfig.devDependencies, jsonConfig.optionalDependencies, jsonConfig.peerDependencies], ts.getOwnKeys);
-                addInferredTypings(jsonTypingNames, "Typing names in '" + jsonPath + "' dependencies");
-            }
-            /**
-             * Infer typing names from given file names. For example, the file name "jquery-min.2.3.4.js"
-             * should be inferred to the 'jquery' typing name; and "angular-route.1.2.3.js" should be inferred
-             * to the 'angular-route' typing name.
-             * @param fileNames are the names for source files in the project
-             */
-            function getTypingNamesFromSourceFileNames(fileNames) {
-                var fromFileNames = ts.mapDefined(fileNames, function (j) {
-                    if (!ts.hasJavaScriptFileExtension(j))
-                        return undefined;
-                    var inferredTypingName = ts.removeFileExtension(ts.getBaseFileName(j.toLowerCase()));
-                    var cleanedTypingName = ts.removeMinAndVersionNumbers(inferredTypingName);
-                    return safeList.get(cleanedTypingName);
-                });
-                if (fromFileNames.length) {
-                    addInferredTypings(fromFileNames, "Inferred typings from file names");
-                }
-                var hasJsxFile = ts.some(fileNames, function (f) { return ts.fileExtensionIs(f, ".jsx" /* Jsx */); });
-                if (hasJsxFile) {
-                    if (log)
-                        log("Inferred 'react' typings due to presence of '.jsx' extension");
-                    addInferredTyping("react");
-                }
-            }
-            /**
-             * Infer typing names from packages folder (ex: node_module, bower_components)
-             * @param packagesFolderPath is the path to the packages folder
-             */
-            function getTypingNamesFromPackagesFolder(packagesFolderPath, filesToWatch) {
-                filesToWatch.push(packagesFolderPath);
-                // Todo: add support for ModuleResolutionHost too
-                if (!host.directoryExists(packagesFolderPath)) {
-                    return;
-                }
-                // depth of 2, so we access `node_modules/foo` but not `node_modules/foo/bar`
-                var fileNames = host.readDirectory(packagesFolderPath, [".json" /* Json */], /*excludes*/ undefined, /*includes*/ undefined, /*depth*/ 2);
-                if (log)
-                    log("Searching for typing names in " + packagesFolderPath + "; all files: " + JSON.stringify(fileNames));
-                var packageNames = [];
-                for (var _i = 0, fileNames_1 = fileNames; _i < fileNames_1.length; _i++) {
-                    var fileName = fileNames_1[_i];
-                    var normalizedFileName = ts.normalizePath(fileName);
-                    var baseFileName = ts.getBaseFileName(normalizedFileName);
-                    if (baseFileName !== "package.json" && baseFileName !== "bower.json") {
-                        continue;
-                    }
-                    var result_6 = ts.readConfigFile(normalizedFileName, function (path) { return host.readFile(path); });
-                    var packageJson = result_6.config;
-                    // npm 3's package.json contains a "_requiredBy" field
-                    // we should include all the top level module names for npm 2, and only module names whose
-                    // "_requiredBy" field starts with "#" or equals "/" for npm 3.
-                    if (baseFileName === "package.json" && packageJson._requiredBy &&
-                        ts.filter(packageJson._requiredBy, function (r) { return r[0] === "#" || r === "/"; }).length === 0) {
-                        continue;
-                    }
-                    // If the package has its own d.ts typings, those will take precedence. Otherwise the package name will be used
-                    // to download d.ts files from DefinitelyTyped
-                    if (!packageJson.name) {
-                        continue;
-                    }
-                    var ownTypes = packageJson.types || packageJson.typings;
-                    if (ownTypes) {
-                        var absolutePath = ts.getNormalizedAbsolutePath(ownTypes, ts.getDirectoryPath(normalizedFileName));
-                        if (log)
-                            log("    Package '" + packageJson.name + "' provides its own types.");
-                        inferredTypings.set(packageJson.name, absolutePath);
-                    }
-                    else {
-                        packageNames.push(packageJson.name);
-                    }
-                }
-                addInferredTypings(packageNames, "    Found package names");
-            }
-        }
-        JsTyping.discoverTypings = discoverTypings;
-        var PackageNameValidationResult;
-        (function (PackageNameValidationResult) {
-            PackageNameValidationResult[PackageNameValidationResult["Ok"] = 0] = "Ok";
-            PackageNameValidationResult[PackageNameValidationResult["ScopedPackagesNotSupported"] = 1] = "ScopedPackagesNotSupported";
-            PackageNameValidationResult[PackageNameValidationResult["EmptyName"] = 2] = "EmptyName";
-            PackageNameValidationResult[PackageNameValidationResult["NameTooLong"] = 3] = "NameTooLong";
-            PackageNameValidationResult[PackageNameValidationResult["NameStartsWithDot"] = 4] = "NameStartsWithDot";
-            PackageNameValidationResult[PackageNameValidationResult["NameStartsWithUnderscore"] = 5] = "NameStartsWithUnderscore";
-            PackageNameValidationResult[PackageNameValidationResult["NameContainsNonURISafeCharacters"] = 6] = "NameContainsNonURISafeCharacters";
-        })(PackageNameValidationResult = JsTyping.PackageNameValidationResult || (JsTyping.PackageNameValidationResult = {}));
-        var maxPackageNameLength = 214;
-        /**
-         * Validates package name using rules defined at https://docs.npmjs.com/files/package.json
-         */
-        function validatePackageName(packageName) {
-            if (!packageName) {
-                return 2 /* EmptyName */;
-            }
-            if (packageName.length > maxPackageNameLength) {
-                return 3 /* NameTooLong */;
-            }
-            if (packageName.charCodeAt(0) === 46 /* dot */) {
-                return 4 /* NameStartsWithDot */;
-            }
-            if (packageName.charCodeAt(0) === 95 /* _ */) {
-                return 5 /* NameStartsWithUnderscore */;
-            }
-            // check if name is scope package like: starts with @ and has one '/' in the middle
-            // scoped packages are not currently supported
-            // TODO: when support will be added we'll need to split and check both scope and package name
-            if (/^@[^/]+\/[^/]+$/.test(packageName)) {
-                return 1 /* ScopedPackagesNotSupported */;
-            }
-            if (encodeURIComponent(packageName) !== packageName) {
-                return 6 /* NameContainsNonURISafeCharacters */;
-            }
-            return 0 /* Ok */;
-        }
-        JsTyping.validatePackageName = validatePackageName;
-        function renderPackageNameValidationFailure(result, typing) {
-            switch (result) {
-                case 2 /* EmptyName */:
-                    return "Package name '" + typing + "' cannot be empty";
-                case 3 /* NameTooLong */:
-                    return "Package name '" + typing + "' should be less than " + maxPackageNameLength + " characters";
-                case 4 /* NameStartsWithDot */:
-                    return "Package name '" + typing + "' cannot start with '.'";
-                case 5 /* NameStartsWithUnderscore */:
-                    return "Package name '" + typing + "' cannot start with '_'";
-                case 1 /* ScopedPackagesNotSupported */:
-                    return "Package '" + typing + "' is scoped and currently is not supported";
-                case 6 /* NameContainsNonURISafeCharacters */:
-                    return "Package name '" + typing + "' contains non URI safe characters";
-                case 0 /* Ok */:
-                    return ts.Debug.fail(); // Shouldn't have called this.
-                default:
-                    throw ts.Debug.assertNever(result);
-            }
-        }
-        JsTyping.renderPackageNameValidationFailure = renderPackageNameValidationFailure;
-    })(JsTyping = ts.JsTyping || (ts.JsTyping = {}));
-})(ts || (ts = {}));
-/* @internal */
-var ts;
 (function (ts) {
     var NavigateTo;
     (function (NavigateTo) {
@@ -93380,7 +95106,7 @@ var ts;
             if (!patternMatcher)
                 return ts.emptyArray;
             var rawItems = [];
-            var _loop_15 = function (sourceFile) {
+            var _loop_4 = function (sourceFile) {
                 cancellationToken.throwIfCancellationRequested();
                 if (excludeDtsFiles && ts.fileExtensionIs(sourceFile.fileName, ".d.ts" /* Dts */)) {
                     return "continue";
@@ -93390,9 +95116,9 @@ var ts;
                 });
             };
             // Search the declarations in all files and output matched NavigateToItem into array of NavigateToItem[]
-            for (var _i = 0, sourceFiles_7 = sourceFiles; _i < sourceFiles_7.length; _i++) {
-                var sourceFile = sourceFiles_7[_i];
-                _loop_15(sourceFile);
+            for (var _i = 0, sourceFiles_3 = sourceFiles; _i < sourceFiles_3.length; _i++) {
+                var sourceFile = sourceFiles_3[_i];
+                _loop_4(sourceFile);
             }
             rawItems.sort(compareNavigateToItems);
             if (maxResultCount !== undefined) {
@@ -93408,8 +95134,8 @@ var ts;
             if (!match) {
                 return; // continue to next named declarations
             }
-            for (var _i = 0, declarations_12 = declarations; _i < declarations_12.length; _i++) {
-                var declaration = declarations_12[_i];
+            for (var _i = 0, declarations_3 = declarations; _i < declarations_3.length; _i++) {
+                var declaration = declarations_3[_i];
                 if (!shouldKeepItem(declaration, checker))
                     continue;
                 if (patternMatcher.patternContainsDots) {
@@ -93587,7 +95313,7 @@ var ts;
         }
         function rootNavigationBarNode(sourceFile) {
             ts.Debug.assert(!parentsStack.length);
-            var root = { node: sourceFile, additionalNodes: undefined, parent: undefined, children: undefined, indent: 0 };
+            var root = { node: sourceFile, name: undefined, additionalNodes: undefined, parent: undefined, children: undefined, indent: 0 };
             parent = root;
             for (var _i = 0, _a = sourceFile.statements; _i < _a.length; _i++) {
                 var statement = _a[_i];
@@ -93603,6 +95329,7 @@ var ts;
         function emptyNavigationBarNode(node) {
             return {
                 node: node,
+                name: ts.isDeclaration(node) || ts.isExpression(node) ? ts.getNameOfDeclaration(node) : undefined,
                 additionalNodes: undefined,
                 parent: parent,
                 children: undefined,
@@ -93887,11 +95614,10 @@ var ts;
                     return undefined;
             }
         }
-        function getItemName(node) {
+        function getItemName(node, name) {
             if (node.kind === 239 /* ModuleDeclaration */) {
                 return getModuleName(node);
             }
-            var name = ts.getNameOfDeclaration(node);
             if (name) {
                 var text = nodeText(name);
                 if (text.length > 0) {
@@ -93993,16 +95719,17 @@ var ts;
         }
         function convertToTree(n) {
             return {
-                text: getItemName(n.node),
+                text: getItemName(n.node, n.name),
                 kind: ts.getNodeKind(n.node),
                 kindModifiers: getModifiers(n.node),
                 spans: getSpans(n),
+                nameSpan: n.name && getNodeSpan(n.name),
                 childItems: ts.map(n.children, convertToTree)
             };
         }
         function convertToTopLevelItem(n) {
             return {
-                text: getItemName(n.node),
+                text: getItemName(n.node, n.name),
                 kind: ts.getNodeKind(n.node),
                 kindModifiers: getModifiers(n.node),
                 spans: getSpans(n),
@@ -94013,7 +95740,7 @@ var ts;
             };
             function convertToChildItem(n) {
                 return {
-                    text: getItemName(n.node),
+                    text: getItemName(n.node, n.name),
                     kind: ts.getNodeKind(n.node),
                     kindModifiers: ts.getNodeModifiers(n.node),
                     spans: getSpans(n),
@@ -94488,8 +96215,8 @@ var ts;
             var firstSingleLineCommentStart = -1;
             var lastSingleLineCommentEnd = -1;
             var singleLineCommentCount = 0;
-            for (var _i = 0, comments_3 = comments; _i < comments_3.length; _i++) {
-                var _a = comments_3[_i], kind = _a.kind, pos = _a.pos, end = _a.end;
+            for (var _i = 0, comments_1 = comments; _i < comments_1.length; _i++) {
+                var _a = comments_1[_i], kind = _a.kind, pos = _a.pos, end = _a.end;
                 cancellationToken.throwIfCancellationRequested();
                 switch (kind) {
                     case 2 /* SingleLineCommentTrivia */:
@@ -94875,15 +96602,15 @@ var ts;
     // Assumes 'value' is already lowercase.
     function indexOfIgnoringCase(str, value) {
         var n = str.length - value.length;
-        var _loop_16 = function (start) {
+        var _loop_5 = function (start) {
             if (every(value, function (valueChar, i) { return toLowerCase(str.charCodeAt(i + start)) === valueChar; })) {
                 return { value: start };
             }
         };
         for (var start = 0; start <= n; start++) {
-            var state_4 = _loop_16(start);
-            if (typeof state_4 === "object")
-                return state_4.value;
+            var state_1 = _loop_5(start);
+            if (typeof state_1 === "object")
+                return state_1.value;
         }
         return -1;
     }
@@ -95067,6 +96794,7 @@ var ts;
             checkJsDirective: undefined,
             referencedFiles: [],
             typeReferenceDirectives: [],
+            libReferenceDirectives: [],
             amdDependencies: [],
             hasNoDefaultLib: undefined,
             moduleName: undefined
@@ -95367,7 +97095,7 @@ var ts;
                     importedFiles.push(decl.ref);
                 }
             }
-            return { referencedFiles: pragmaContext.referencedFiles, typeReferenceDirectives: pragmaContext.typeReferenceDirectives, importedFiles: importedFiles, isLibFile: !!pragmaContext.hasNoDefaultLib, ambientExternalModules: undefined };
+            return { referencedFiles: pragmaContext.referencedFiles, typeReferenceDirectives: pragmaContext.typeReferenceDirectives, libReferenceDirectives: pragmaContext.libReferenceDirectives, importedFiles: importedFiles, isLibFile: !!pragmaContext.hasNoDefaultLib, ambientExternalModules: undefined };
         }
         else {
             // for global scripts ambient modules still can have augmentations - look for ambient modules with depth > 0
@@ -95386,7 +97114,7 @@ var ts;
                     }
                 }
             }
-            return { referencedFiles: pragmaContext.referencedFiles, typeReferenceDirectives: pragmaContext.typeReferenceDirectives, importedFiles: importedFiles, isLibFile: !!pragmaContext.hasNoDefaultLib, ambientExternalModules: ambientModuleNames };
+            return { referencedFiles: pragmaContext.referencedFiles, typeReferenceDirectives: pragmaContext.typeReferenceDirectives, libReferenceDirectives: pragmaContext.libReferenceDirectives, importedFiles: importedFiles, isLibFile: !!pragmaContext.hasNoDefaultLib, ambientExternalModules: ambientModuleNames };
         }
     }
     ts.preProcessFile = preProcessFile;
@@ -95398,7 +97126,7 @@ var ts;
     (function (Rename) {
         function getRenameInfo(typeChecker, defaultLibFileName, getCanonicalFileName, sourceFile, position) {
             var getCanonicalDefaultLibName = ts.memoize(function () { return getCanonicalFileName(ts.normalizePath(defaultLibFileName)); });
-            var node = ts.getTouchingPropertyName(sourceFile, position, /*includeJsDocComment*/ true);
+            var node = ts.getTouchingPropertyName(sourceFile, position);
             var renameInfo = node && nodeIsEligibleForRename(node)
                 ? getRenameInfoForNode(node, typeChecker, sourceFile, isDefinedInLibraryFile)
                 : undefined;
@@ -95552,11 +97280,11 @@ var ts;
                 return undefined;
             }
             var typeChecker = program.getTypeChecker();
-            var _loop_17 = function (sourceFile) {
+            var _loop_6 = function (sourceFile) {
                 var nameToDeclarations = sourceFile.getNamedDeclarations();
                 var declarations = nameToDeclarations.get(name.text);
                 if (declarations) {
-                    var _loop_18 = function (declaration) {
+                    var _loop_7 = function (declaration) {
                         var symbol = declaration.symbol;
                         if (symbol) {
                             var type = typeChecker.getTypeOfSymbolAtLocation(symbol, declaration);
@@ -95568,19 +97296,19 @@ var ts;
                             }
                         }
                     };
-                    for (var _i = 0, declarations_13 = declarations; _i < declarations_13.length; _i++) {
-                        var declaration = declarations_13[_i];
-                        var state_6 = _loop_18(declaration);
-                        if (typeof state_6 === "object")
-                            return state_6;
+                    for (var _i = 0, declarations_4 = declarations; _i < declarations_4.length; _i++) {
+                        var declaration = declarations_4[_i];
+                        var state_3 = _loop_7(declaration);
+                        if (typeof state_3 === "object")
+                            return state_3;
                     }
                 }
             };
             for (var _i = 0, _a = program.getSourceFiles(); _i < _a.length; _i++) {
                 var sourceFile = _a[_i];
-                var state_5 = _loop_17(sourceFile);
-                if (typeof state_5 === "object")
-                    return state_5.value;
+                var state_2 = _loop_6(sourceFile);
+                if (typeof state_2 === "object")
+                    return state_2.value;
             }
         }
         function getArgumentInfoForCompletions(node, position, sourceFile) {
@@ -95808,7 +97536,7 @@ var ts;
             return ts.createTextSpan(applicableSpanStart, applicableSpanEnd - applicableSpanStart);
         }
         function getContainingArgumentInfo(node, position, sourceFile) {
-            var _loop_19 = function (n) {
+            var _loop_8 = function (n) {
                 // If the node is not a subspan of its parent, this is a big problem.
                 // There have been crashes that might be caused by this violation.
                 ts.Debug.assert(ts.rangeContainsRange(n.parent, n), "Not a subspan", function () { return "Child: " + ts.Debug.showSyntaxKind(n) + ", parent: " + ts.Debug.showSyntaxKind(n.parent); });
@@ -95818,9 +97546,9 @@ var ts;
                 }
             };
             for (var n = node; !ts.isBlock(n) && !ts.isSourceFile(n); n = n.parent) {
-                var state_7 = _loop_19(n);
-                if (typeof state_7 === "object")
-                    return state_7.value;
+                var state_4 = _loop_8(n);
+                if (typeof state_4 === "object")
+                    return state_4.value;
             }
             return undefined;
         }
@@ -95950,8 +97678,8 @@ var ts;
                 var name = importNameForConvertToDefaultImport(importNode);
                 if (!name)
                     continue;
-                var module_2 = ts.getResolvedModule(sourceFile, moduleSpecifier.text);
-                var resolvedFile = module_2 && program.getSourceFile(module_2.resolvedFileName);
+                var module = ts.getResolvedModule(sourceFile, moduleSpecifier.text);
+                var resolvedFile = module && program.getSourceFile(module.resolvedFileName);
                 if (resolvedFile && resolvedFile.externalModuleIndicator && ts.isExportAssignment(resolvedFile.externalModuleIndicator) && resolvedFile.externalModuleIndicator.isExportEquals) {
                     diags.push(ts.createDiagnosticForNode(name, ts.Diagnostics.Import_may_be_converted_to_a_default_import));
                 }
@@ -95966,8 +97694,8 @@ var ts;
                     case 192 /* FunctionExpression */:
                         var decl = ts.getDeclarationOfJSInitializer(node);
                         if (decl) {
-                            var symbol_3 = decl.symbol;
-                            if (symbol_3 && (symbol_3.exports && symbol_3.exports.size || symbol_3.members && symbol_3.members.size)) {
+                            var symbol_2 = decl.symbol;
+                            if (symbol_2 && (symbol_2.exports && symbol_2.exports.size || symbol_2.members && symbol_2.members.size)) {
                                 diags.push(ts.createDiagnosticForNode(ts.isVariableDeclaration(node.parent) ? node.parent.name : node, ts.Diagnostics.This_constructor_function_may_be_converted_to_a_class_declaration));
                                 break;
                             }
@@ -96755,7 +98483,7 @@ var ts;
             return typeof o.type === "object" && !ts.forEachEntry(o.type, function (v) { return typeof v !== "number"; });
         });
         options = ts.cloneCompilerOptions(options);
-        var _loop_20 = function (opt) {
+        var _loop_9 = function (opt) {
             if (!ts.hasProperty(options, opt.name)) {
                 return "continue";
             }
@@ -96774,7 +98502,7 @@ var ts;
         };
         for (var _i = 0, commandLineOptionsStringToEnum_1 = commandLineOptionsStringToEnum; _i < commandLineOptionsStringToEnum_1.length; _i++) {
             var opt = commandLineOptionsStringToEnum_1[_i];
-            _loop_20(opt);
+            _loop_9(opt);
         }
         return options;
     }
@@ -97764,18 +99492,18 @@ var ts;
             // This array is used only during construction of the rulesbucket in the map
             var rulesBucketConstructionStateList = new Array(map.length);
             for (var _i = 0, rules_1 = rules; _i < rules_1.length; _i++) {
-                var rule_1 = rules_1[_i];
-                var specificRule = rule_1.leftTokenRange.isSpecific && rule_1.rightTokenRange.isSpecific;
-                for (var _a = 0, _b = rule_1.leftTokenRange.tokens; _a < _b.length; _a++) {
+                var rule = rules_1[_i];
+                var specificRule = rule.leftTokenRange.isSpecific && rule.rightTokenRange.isSpecific;
+                for (var _a = 0, _b = rule.leftTokenRange.tokens; _a < _b.length; _a++) {
                     var left = _b[_a];
-                    for (var _c = 0, _d = rule_1.rightTokenRange.tokens; _c < _d.length; _c++) {
+                    for (var _c = 0, _d = rule.rightTokenRange.tokens; _c < _d.length; _c++) {
                         var right = _d[_c];
                         var index = getRuleBucketIndex(left, right);
                         var rulesBucket = map[index];
                         if (rulesBucket === undefined) {
                             rulesBucket = map[index] = [];
                         }
-                        addRule(rulesBucket, rule_1.rule, specificRule, rulesBucketConstructionStateList, index);
+                        addRule(rulesBucket, rule.rule, specificRule, rulesBucketConstructionStateList, index);
                     }
                 }
             }
@@ -98385,8 +100113,8 @@ var ts;
                             else if (tokenInfo.token.kind === listStartToken) {
                                 // consume list start token
                                 startLine = sourceFile.getLineAndCharacterOfPosition(tokenInfo.token.pos).line;
-                                var indentation_2 = computeIndentation(tokenInfo.token, startLine, -1 /* Unknown */, parent, parentDynamicIndentation, parentStartLine);
-                                listDynamicIndentation = getDynamicIndentation(parent, parentStartLine, indentation_2.indentation, indentation_2.delta);
+                                var indentation_1 = computeIndentation(tokenInfo.token, startLine, -1 /* Unknown */, parent, parentDynamicIndentation, parentStartLine);
+                                listDynamicIndentation = getDynamicIndentation(parent, parentStartLine, indentation_1.indentation, indentation_1.delta);
                                 consumeTokenAndAdvanceScanner(tokenInfo, parent, listDynamicIndentation, parent);
                             }
                             else {
@@ -99985,14 +101713,14 @@ var ts;
                     // order changes by start position
                     // If the start position is the same, put the shorter range first, since an empty range (x, x) may precede (x, y) but not vice-versa.
                     var normalized = ts.stableSort(changesInFile, function (a, b) { return (a.range.pos - b.range.pos) || (a.range.end - b.range.end); });
-                    var _loop_21 = function (i) {
+                    var _loop_10 = function (i) {
                         ts.Debug.assert(normalized[i].range.end <= normalized[i + 1].range.pos, "Changes overlap", function () {
                             return JSON.stringify(normalized[i].range) + " and " + JSON.stringify(normalized[i + 1].range);
                         });
                     };
                     // verify that change intervals do not overlap, except possibly at end points.
                     for (var i = 0; i < normalized.length - 1; i++) {
-                        _loop_21(i);
+                        _loop_10(i);
                     }
                     var textChanges = normalized.map(function (c) {
                         return ts.createTextChange(ts.createTextSpanFromRange(c.range), computeNewText(c, sourceFile, newLineCharacter, formatContext, validate));
@@ -100004,7 +101732,7 @@ var ts;
             function newFileChanges(oldFile, fileName, statements, newLineCharacter, formatContext) {
                 // TODO: this emits the file, parses it back, then formats it that -- may be a less roundabout way to do this
                 var nonFormattedText = statements.map(function (s) { return getNonformattedText(s, oldFile, newLineCharacter).text; }).join(newLineCharacter);
-                var sourceFile = ts.createSourceFile(fileName, nonFormattedText, 6 /* ESNext */);
+                var sourceFile = ts.createSourceFile(fileName, nonFormattedText, 6 /* ESNext */, /*setParentNodes*/ true);
                 var changes = ts.formatting.formatDocument(sourceFile, formatContext);
                 var text = applyChanges(nonFormattedText, changes);
                 return { fileName: fileName, textChanges: [ts.createTextChange(ts.createTextSpan(0, 0), text)], isNewFile: true };
@@ -100761,11 +102489,11 @@ var ts;
             getCodeActions: function (context) {
                 var sourceFile = context.sourceFile, program = context.program, preferences = context.preferences;
                 var changes = ts.textChanges.ChangeTracker.with(context, function (changes) {
-                    var moduleExportsChangedToDefault = convertFileToEs6Module(sourceFile, program.getTypeChecker(), changes, program.getCompilerOptions().target, preferences);
+                    var moduleExportsChangedToDefault = convertFileToEs6Module(sourceFile, program.getTypeChecker(), changes, program.getCompilerOptions().target, ts.getQuotePreference(sourceFile, preferences));
                     if (moduleExportsChangedToDefault) {
                         for (var _i = 0, _a = program.getSourceFiles(); _i < _a.length; _i++) {
                             var importingFile = _a[_i];
-                            fixImportOfModuleExports(importingFile, sourceFile, changes, preferences);
+                            fixImportOfModuleExports(importingFile, sourceFile, changes, ts.getQuotePreference(importingFile, preferences));
                         }
                     }
                 });
@@ -100773,7 +102501,7 @@ var ts;
                 return [codefix.createCodeFixActionNoFixId("convertToEs6Module", changes, ts.Diagnostics.Convert_to_ES6_module)];
             },
         });
-        function fixImportOfModuleExports(importingFile, exportingFile, changes, preferences) {
+        function fixImportOfModuleExports(importingFile, exportingFile, changes, quotePreference) {
             for (var _i = 0, _a = importingFile.imports; _i < _a.length; _i++) {
                 var moduleSpecifier = _a[_i];
                 var imported = ts.getResolvedModule(importingFile, moduleSpecifier.text);
@@ -100783,7 +102511,7 @@ var ts;
                 var importNode = ts.importFromModuleSpecifier(moduleSpecifier);
                 switch (importNode.kind) {
                     case 243 /* ImportEqualsDeclaration */:
-                        changes.replaceNode(importingFile, importNode, ts.makeImport(importNode.name, /*namedImports*/ undefined, moduleSpecifier, preferences));
+                        changes.replaceNode(importingFile, importNode, ts.makeImport(importNode.name, /*namedImports*/ undefined, moduleSpecifier, quotePreference));
                         break;
                     case 187 /* CallExpression */:
                         if (ts.isRequireCall(importNode, /*checkArgumentIsStringLiteralLike*/ false)) {
@@ -100794,14 +102522,14 @@ var ts;
             }
         }
         /** @returns Whether we converted a `module.exports =` to a default export. */
-        function convertFileToEs6Module(sourceFile, checker, changes, target, preferences) {
+        function convertFileToEs6Module(sourceFile, checker, changes, target, quotePreference) {
             var identifiers = { original: collectFreeIdentifiers(sourceFile), additional: ts.createMap() };
             var exports = collectExportRenames(sourceFile, checker, identifiers);
             convertExportsAccesses(sourceFile, exports, changes);
             var moduleExportsChangedToDefault = false;
             for (var _i = 0, _a = sourceFile.statements; _i < _a.length; _i++) {
                 var statement = _a[_i];
-                var moduleExportsChanged = convertStatement(sourceFile, statement, checker, changes, identifiers, target, exports, preferences);
+                var moduleExportsChanged = convertStatement(sourceFile, statement, checker, changes, identifiers, target, exports, quotePreference);
                 moduleExportsChangedToDefault = moduleExportsChangedToDefault || moduleExportsChanged;
             }
             return moduleExportsChangedToDefault;
@@ -100836,10 +102564,10 @@ var ts;
                 node.forEachChild(recur);
             });
         }
-        function convertStatement(sourceFile, statement, checker, changes, identifiers, target, exports, preferences) {
+        function convertStatement(sourceFile, statement, checker, changes, identifiers, target, exports, quotePreference) {
             switch (statement.kind) {
                 case 214 /* VariableStatement */:
-                    convertVariableStatement(sourceFile, statement, changes, checker, identifiers, target, preferences);
+                    convertVariableStatement(sourceFile, statement, changes, checker, identifiers, target, quotePreference);
                     return false;
                 case 216 /* ExpressionStatement */: {
                     var expression = statement.expression;
@@ -100847,7 +102575,7 @@ var ts;
                         case 187 /* CallExpression */: {
                             if (ts.isRequireCall(expression, /*checkArgumentIsStringLiteralLike*/ true)) {
                                 // For side-effecting require() call, just make a side-effecting import.
-                                changes.replaceNode(sourceFile, statement, ts.makeImport(/*name*/ undefined, /*namedImports*/ undefined, expression.arguments[0], preferences));
+                                changes.replaceNode(sourceFile, statement, ts.makeImport(/*name*/ undefined, /*namedImports*/ undefined, expression.arguments[0], quotePreference));
                             }
                             return false;
                         }
@@ -100862,7 +102590,7 @@ var ts;
                     return false;
             }
         }
-        function convertVariableStatement(sourceFile, statement, changes, checker, identifiers, target, preferences) {
+        function convertVariableStatement(sourceFile, statement, changes, checker, identifiers, target, quotePreference) {
             var declarationList = statement.declarationList;
             var foundImport = false;
             var newNodes = ts.flatMap(declarationList.declarations, function (decl) {
@@ -100875,11 +102603,11 @@ var ts;
                     }
                     else if (ts.isRequireCall(initializer, /*checkArgumentIsStringLiteralLike*/ true)) {
                         foundImport = true;
-                        return convertSingleImport(sourceFile, name, initializer.arguments[0], changes, checker, identifiers, target, preferences);
+                        return convertSingleImport(sourceFile, name, initializer.arguments[0], changes, checker, identifiers, target, quotePreference);
                     }
                     else if (ts.isPropertyAccessExpression(initializer) && ts.isRequireCall(initializer.expression, /*checkArgumentIsStringLiteralLike*/ true)) {
                         foundImport = true;
-                        return convertPropertyAccessImport(name, initializer.name.text, initializer.expression.arguments[0], identifiers, preferences);
+                        return convertPropertyAccessImport(name, initializer.name.text, initializer.expression.arguments[0], identifiers, quotePreference);
                     }
                 }
                 // Move it out to its own variable statement. (This will not be used if `!foundImport`)
@@ -100891,20 +102619,20 @@ var ts;
             }
         }
         /** Converts `const name = require("moduleSpecifier").propertyName` */
-        function convertPropertyAccessImport(name, propertyName, moduleSpecifier, identifiers, preferences) {
+        function convertPropertyAccessImport(name, propertyName, moduleSpecifier, identifiers, quotePreference) {
             switch (name.kind) {
                 case 180 /* ObjectBindingPattern */:
                 case 181 /* ArrayBindingPattern */: {
                     // `const [a, b] = require("c").d` --> `import { d } from "c"; const [a, b] = d;`
                     var tmp = makeUniqueName(propertyName, identifiers);
                     return [
-                        makeSingleImport(tmp, propertyName, moduleSpecifier, preferences),
+                        makeSingleImport(tmp, propertyName, moduleSpecifier, quotePreference),
                         makeConst(/*modifiers*/ undefined, name, ts.createIdentifier(tmp)),
                     ];
                 }
                 case 71 /* Identifier */:
                     // `const a = require("b").c` --> `import { c as a } from "./b";
-                    return [makeSingleImport(name.text, propertyName, moduleSpecifier, preferences)];
+                    return [makeSingleImport(name.text, propertyName, moduleSpecifier, quotePreference)];
                 default:
                     return ts.Debug.assertNever(name);
             }
@@ -101046,7 +102774,7 @@ var ts;
          * Returns nodes that will replace the variable declaration for the commonjs import.
          * May also make use `changes` to remove qualifiers at the use sites of imports, to change `mod.x` to `x`.
          */
-        function convertSingleImport(file, name, moduleSpecifier, changes, checker, identifiers, target, preferences) {
+        function convertSingleImport(file, name, moduleSpecifier, changes, checker, identifiers, target, quotePreference) {
             switch (name.kind) {
                 case 180 /* ObjectBindingPattern */: {
                     var importSpecifiers = ts.mapAllOrFail(name.elements, function (e) {
@@ -101055,7 +102783,7 @@ var ts;
                             : makeImportSpecifier(e.propertyName && e.propertyName.text, e.name.text);
                     }); // tslint:disable-line no-unnecessary-type-assertion (TODO: GH#18217)
                     if (importSpecifiers) {
-                        return [ts.makeImport(/*name*/ undefined, importSpecifiers, moduleSpecifier, preferences)];
+                        return [ts.makeImport(/*name*/ undefined, importSpecifiers, moduleSpecifier, quotePreference)];
                     }
                 }
                 // falls through -- object destructuring has an interesting pattern and must be a variable declaration
@@ -101066,12 +102794,12 @@ var ts;
                     */
                     var tmp = makeUniqueName(codefix.moduleSpecifierToValidIdentifier(moduleSpecifier.text, target), identifiers);
                     return [
-                        ts.makeImport(ts.createIdentifier(tmp), /*namedImports*/ undefined, moduleSpecifier, preferences),
+                        ts.makeImport(ts.createIdentifier(tmp), /*namedImports*/ undefined, moduleSpecifier, quotePreference),
                         makeConst(/*modifiers*/ undefined, ts.getSynthesizedDeepClone(name), ts.createIdentifier(tmp)),
                     ];
                 }
                 case 71 /* Identifier */:
-                    return convertSingleIdentifierImport(file, name, moduleSpecifier, changes, checker, identifiers, preferences);
+                    return convertSingleIdentifierImport(file, name, moduleSpecifier, changes, checker, identifiers, quotePreference);
                 default:
                     return ts.Debug.assertNever(name);
             }
@@ -101080,7 +102808,7 @@ var ts;
          * Convert `import x = require("x").`
          * Also converts uses like `x.y()` to `y()` and uses a named import.
          */
-        function convertSingleIdentifierImport(file, name, moduleSpecifier, changes, checker, identifiers, preferences) {
+        function convertSingleIdentifierImport(file, name, moduleSpecifier, changes, checker, identifiers, quotePreference) {
             var nameSymbol = checker.getSymbolAtLocation(name);
             // Maps from module property name to name actually used. (The same if there isn't shadowing.)
             var namedBindingsNames = ts.createMap();
@@ -101115,7 +102843,7 @@ var ts;
                 // If it was unused, ensure that we at least import *something*.
                 needDefaultImport = true;
             }
-            return [ts.makeImport(needDefaultImport ? ts.getSynthesizedDeepClone(name) : undefined, namedBindings, moduleSpecifier, preferences)];
+            return [ts.makeImport(needDefaultImport ? ts.getSynthesizedDeepClone(name) : undefined, namedBindings, moduleSpecifier, quotePreference)];
         }
         // Identifiers helpers
         function makeUniqueName(name, identifiers) {
@@ -101161,10 +102889,10 @@ var ts;
             return ts.createClassDeclaration(ts.getSynthesizedDeepClones(cls.decorators), // TODO: GH#19915 Don't think this is even legal.
             ts.concatenate(additionalModifiers, ts.getSynthesizedDeepClones(cls.modifiers)), name, ts.getSynthesizedDeepClones(cls.typeParameters), ts.getSynthesizedDeepClones(cls.heritageClauses), ts.getSynthesizedDeepClones(cls.members));
         }
-        function makeSingleImport(localName, propertyName, moduleSpecifier, preferences) {
+        function makeSingleImport(localName, propertyName, moduleSpecifier, quotePreference) {
             return propertyName === "default"
-                ? ts.makeImport(ts.createIdentifier(localName), /*namedImports*/ undefined, moduleSpecifier, preferences)
-                : ts.makeImport(/*name*/ undefined, [makeImportSpecifier(propertyName, localName)], moduleSpecifier, preferences);
+                ? ts.makeImport(ts.createIdentifier(localName), /*namedImports*/ undefined, moduleSpecifier, quotePreference)
+                : ts.makeImport(/*name*/ undefined, [makeImportSpecifier(propertyName, localName)], moduleSpecifier, quotePreference);
         }
         function makeImportSpecifier(propertyName, name) {
             return ts.createImportSpecifier(propertyName !== undefined && propertyName !== name ? ts.createIdentifier(propertyName) : undefined, ts.createIdentifier(name));
@@ -101436,7 +103164,7 @@ var ts;
             var sourceFile = context.sourceFile, symbolName = context.symbolName, preferences = context.preferences;
             var lastImportDeclaration = ts.findLast(sourceFile.statements, ts.isAnyImportSyntax);
             var moduleSpecifierWithoutQuotes = ts.stripQuotes(moduleSpecifier);
-            var quotedModuleSpecifier = ts.createLiteral(moduleSpecifierWithoutQuotes, shouldUseSingleQuote(sourceFile, preferences));
+            var quotedModuleSpecifier = ts.makeStringLiteral(moduleSpecifierWithoutQuotes, ts.getQuotePreference(sourceFile, preferences));
             var importDecl = importKind !== 3 /* Equals */
                 ? ts.createImportDeclaration(
                 /*decorators*/ undefined, 
@@ -101457,15 +103185,6 @@ var ts;
             // are there are already a new line separating code and import statements.
             return createCodeAction(ts.Diagnostics.Import_0_from_module_1, [symbolName, moduleSpecifierWithoutQuotes], changes);
         }
-        function shouldUseSingleQuote(sourceFile, preferences) {
-            if (preferences.quotePreference) {
-                return preferences.quotePreference === "single";
-            }
-            else {
-                var firstModuleSpecifier = ts.firstOrUndefined(sourceFile.imports);
-                return !!firstModuleSpecifier && !ts.isStringDoubleQuoted(firstModuleSpecifier, sourceFile);
-            }
-        }
         function createImportClauseOfKind(kind, symbolName) {
             var id = ts.createIdentifier(symbolName);
             switch (kind) {
@@ -102419,6 +104138,7 @@ var ts;
             switch (token.kind) {
                 case 71 /* Identifier */:
                     tryDeleteIdentifier(changes, sourceFile, token, deletedAncestors, checker, isFixAll);
+                    deleteAssignments(changes, sourceFile, token, checker);
                     break;
                 case 152 /* PropertyDeclaration */:
                 case 246 /* NamespaceImport */:
@@ -102430,6 +104150,15 @@ var ts;
                     tryDeleteDefault(changes, sourceFile, token, deletedAncestors);
             }
         }
+        function deleteAssignments(changes, sourceFile, token, checker) {
+            ts.FindAllReferences.Core.eachSymbolReferenceInFile(token, checker, sourceFile, function (ref) {
+                if (ref.parent.kind === 185 /* PropertyAccessExpression */)
+                    ref = ref.parent;
+                if (ref.parent.kind === 200 /* BinaryExpression */ && ref.parent.parent.kind === 216 /* ExpressionStatement */) {
+                    changes.deleteNode(sourceFile, ref.parent.parent);
+                }
+            });
+        }
         function tryDeleteDefault(changes, sourceFile, token, deletedAncestors) {
             if (ts.isDeclarationName(token)) {
                 if (deletedAncestors)
@@ -102485,15 +104214,12 @@ var ts;
                     break;
                 case 182 /* BindingElement */: {
                     var pattern = parent.parent;
-                    switch (pattern.kind) {
-                        case 181 /* ArrayBindingPattern */:
-                            changes.deleteNode(sourceFile, parent); // Don't delete ','
-                            break;
-                        case 180 /* ObjectBindingPattern */:
-                            changes.deleteNodeInList(sourceFile, parent);
-                            break;
-                        default:
-                            return ts.Debug.assertNever(pattern);
+                    var preserveComma = pattern.kind === 181 /* ArrayBindingPattern */ && parent !== ts.last(pattern.elements);
+                    if (preserveComma) {
+                        changes.deleteNode(sourceFile, parent);
+                    }
+                    else {
+                        changes.deleteNodeInList(sourceFile, parent);
                     }
                     break;
                 }
@@ -103003,8 +104729,8 @@ var ts;
                         outputMethod(signature, modifiers, name, createStubbedMethodBody(preferences));
                         break;
                     }
-                    for (var _i = 0, signatures_8 = signatures; _i < signatures_8.length; _i++) {
-                        var signature = signatures_8[_i];
+                    for (var _i = 0, signatures_1 = signatures; _i < signatures_1.length; _i++) {
+                        var signature = signatures_1[_i];
                         // Need to ensure nodes are fresh each time so they can have different positions.
                         outputMethod(signature, ts.getSynthesizedDeepClones(modifiers, /*includeTrivia*/ false), ts.getSynthesizedDeepClone(name, /*includeTrivia*/ false));
                     }
@@ -103037,11 +104763,11 @@ var ts;
             return signatureDeclaration;
         }
         function createMethodFromCallExpression(_a, methodName, inJs, makeStatic, preferences) {
-            var typeArguments = _a.typeArguments, args = _a.arguments;
+            var typeArguments = _a.typeArguments, args = _a.arguments, parent = _a.parent;
             return ts.createMethod(
             /*decorators*/ undefined, 
             /*modifiers*/ makeStatic ? [ts.createToken(115 /* StaticKeyword */)] : undefined, 
-            /*asteriskToken*/ undefined, methodName, 
+            /*asteriskToken*/ ts.isYieldExpression(parent) ? ts.createToken(39 /* AsteriskToken */) : undefined, methodName, 
             /*questionToken*/ undefined, 
             /*typeParameters*/ inJs ? undefined : ts.map(typeArguments, function (_, i) {
                 return ts.createTypeParameterDeclaration(84 /* T */ + typeArguments.length - 1 <= 90 /* Z */ ? String.fromCharCode(84 /* T */ + i) : "T" + i);
@@ -103073,8 +104799,8 @@ var ts;
             var maxArgsSignature = signatures[0];
             var minArgumentCount = signatures[0].minArgumentCount;
             var someSigHasRestParameter = false;
-            for (var _i = 0, signatures_9 = signatures; _i < signatures_9.length; _i++) {
-                var sig = signatures_9[_i];
+            for (var _i = 0, signatures_2 = signatures; _i < signatures_2.length; _i++) {
+                var sig = signatures_2[_i];
                 minArgumentCount = Math.min(sig.minArgumentCount, minArgumentCount);
                 if (sig.hasRestParameter) {
                     someSigHasRestParameter = true;
@@ -103595,7 +105321,7 @@ var ts;
                     return checker.createArrayType(getParameterTypeFromCallContexts(0, usageContext.properties.get("push").callContexts, /*isRestParameter*/ false, checker));
                 }
                 else if (usageContext.properties || usageContext.callContexts || usageContext.constructContexts || usageContext.numberIndexContext || usageContext.stringIndexContext) {
-                    var members_6 = ts.createUnderscoreEscapedMap();
+                    var members_1 = ts.createUnderscoreEscapedMap();
                     var callSignatures = [];
                     var constructSignatures = [];
                     var stringIndexInfo = void 0;
@@ -103604,7 +105330,7 @@ var ts;
                         usageContext.properties.forEach(function (context, name) {
                             var symbol = checker.createSymbol(4 /* Property */, name);
                             symbol.type = getTypeFromUsageContext(context, checker) || checker.getAnyType();
-                            members_6.set(name, symbol);
+                            members_1.set(name, symbol);
                         });
                     }
                     if (usageContext.callContexts) {
@@ -103625,7 +105351,7 @@ var ts;
                     if (usageContext.stringIndexContext) {
                         stringIndexInfo = checker.createIndexInfo(getTypeFromUsageContext(usageContext.stringIndexContext, checker), /*isReadonly*/ false);
                     }
-                    return checker.createAnonymousType(/*symbol*/ undefined, members_6, callSignatures, constructSignatures, stringIndexInfo, numberIndexInfo); // TODO: GH#18217
+                    return checker.createAnonymousType(/*symbol*/ undefined, members_1, callSignatures, constructSignatures, stringIndexInfo, numberIndexInfo); // TODO: GH#18217
                 }
                 else {
                     return undefined;
@@ -103702,7 +105428,7 @@ var ts;
             var opts = context.program.getCompilerOptions();
             var variations = [];
             // import Bluebird from "bluebird";
-            variations.push(createAction(context, sourceFile, node, ts.makeImport(namespace.name, /*namedImports*/ undefined, node.moduleSpecifier, context.preferences)));
+            variations.push(createAction(context, sourceFile, node, ts.makeImport(namespace.name, /*namedImports*/ undefined, node.moduleSpecifier, ts.getQuotePreference(sourceFile, context.preferences))));
             if (ts.getEmitModuleKind(opts) === ts.ModuleKind.CommonJS) {
                 // import Bluebird = require("bluebird");
                 variations.push(createAction(context, sourceFile, node, ts.createImportEqualsDeclaration(
@@ -103832,14 +105558,8 @@ var ts;
             return getDefaultValueFromType(checker, checker.getTypeFromTypeNode(propertyDeclaration.type)); // TODO: GH#18217
         }
         function getDefaultValueFromType(checker, type) {
-            if (type.flags & 4 /* String */) {
-                return ts.createLiteral("");
-            }
-            else if (type.flags & 8 /* Number */) {
-                return ts.createNumericLiteral("0");
-            }
-            else if (type.flags & 16 /* Boolean */) {
-                return ts.createFalse();
+            if (type.flags & 256 /* BooleanLiteral */) {
+                return type === checker.getFalseType() ? ts.createFalse() : ts.createTrue();
             }
             else if (type.isLiteral()) {
                 return ts.createLiteral(type.value);
@@ -103856,307 +105576,13 @@ var ts;
                     return undefined;
                 return ts.createNew(ts.createIdentifier(type.symbol.name), /*typeArguments*/ undefined, /*argumentsArray*/ undefined);
             }
+            else if (checker.isArrayLikeType(type)) {
+                return ts.createArrayLiteral();
+            }
             return undefined;
         }
     })(codefix = ts.codefix || (ts.codefix = {}));
 })(ts || (ts = {}));
-// Used by importFixes to synthesize import module specifiers.
-/* @internal */
-var ts;
-(function (ts) {
-    var moduleSpecifiers;
-    (function (moduleSpecifiers) {
-        // Note: fromSourceFile is just for usesJsExtensionOnImports
-        function getModuleSpecifier(program, fromSourceFile, fromSourceFileName, toFileName, host, preferences) {
-            var info = getInfo(program.getCompilerOptions(), fromSourceFile, fromSourceFileName, host);
-            var compilerOptions = program.getCompilerOptions();
-            return getGlobalModuleSpecifier(toFileName, info, host, compilerOptions) ||
-                ts.first(getLocalModuleSpecifiers(toFileName, info, compilerOptions, preferences));
-        }
-        moduleSpecifiers.getModuleSpecifier = getModuleSpecifier;
-        // For each symlink/original for a module, returns a list of ways to import that file.
-        function getModuleSpecifiers(moduleSymbol, program, importingSourceFile, host, preferences) {
-            var ambient = tryGetModuleNameFromAmbientModule(moduleSymbol);
-            if (ambient)
-                return [[ambient]];
-            var compilerOptions = program.getCompilerOptions();
-            var info = getInfo(compilerOptions, importingSourceFile, importingSourceFile.fileName, host);
-            var modulePaths = getAllModulePaths(program, moduleSymbol.valueDeclaration.getSourceFile());
-            var global = ts.mapDefined(modulePaths, function (moduleFileName) { return getGlobalModuleSpecifier(moduleFileName, info, host, compilerOptions); });
-            return global.length ? global.map(function (g) { return [g]; }) : modulePaths.map(function (moduleFileName) {
-                return getLocalModuleSpecifiers(moduleFileName, info, compilerOptions, preferences);
-            });
-        }
-        moduleSpecifiers.getModuleSpecifiers = getModuleSpecifiers;
-        // importingSourceFileName is separate because getEditsForFileRename may need to specify an updated path
-        function getInfo(compilerOptions, importingSourceFile, importingSourceFileName, host) {
-            var moduleResolutionKind = ts.getEmitModuleResolutionKind(compilerOptions);
-            var addJsExtension = usesJsExtensionOnImports(importingSourceFile);
-            var getCanonicalFileName = ts.hostGetCanonicalFileName(host);
-            var sourceDirectory = ts.getDirectoryPath(importingSourceFileName);
-            return { moduleResolutionKind: moduleResolutionKind, addJsExtension: addJsExtension, getCanonicalFileName: getCanonicalFileName, sourceDirectory: sourceDirectory };
-        }
-        function getGlobalModuleSpecifier(moduleFileName, _a, host, compilerOptions) {
-            var addJsExtension = _a.addJsExtension, getCanonicalFileName = _a.getCanonicalFileName, sourceDirectory = _a.sourceDirectory;
-            return tryGetModuleNameFromTypeRoots(compilerOptions, host, getCanonicalFileName, moduleFileName, addJsExtension)
-                || tryGetModuleNameAsNodeModule(compilerOptions, moduleFileName, host, getCanonicalFileName, sourceDirectory)
-                || compilerOptions.rootDirs && tryGetModuleNameFromRootDirs(compilerOptions.rootDirs, moduleFileName, sourceDirectory, getCanonicalFileName);
-        }
-        function getLocalModuleSpecifiers(moduleFileName, _a, compilerOptions, preferences) {
-            var moduleResolutionKind = _a.moduleResolutionKind, addJsExtension = _a.addJsExtension, getCanonicalFileName = _a.getCanonicalFileName, sourceDirectory = _a.sourceDirectory;
-            var baseUrl = compilerOptions.baseUrl, paths = compilerOptions.paths;
-            var relativePath = removeExtensionAndIndexPostFix(ts.ensurePathIsNonModuleName(ts.getRelativePathFromDirectory(sourceDirectory, moduleFileName, getCanonicalFileName)), moduleResolutionKind, addJsExtension);
-            if (!baseUrl || preferences.importModuleSpecifierPreference === "relative") {
-                return [relativePath];
-            }
-            var relativeToBaseUrl = getRelativePathIfInDirectory(moduleFileName, baseUrl, getCanonicalFileName);
-            if (!relativeToBaseUrl) {
-                return [relativePath];
-            }
-            var importRelativeToBaseUrl = removeExtensionAndIndexPostFix(relativeToBaseUrl, moduleResolutionKind, addJsExtension);
-            if (paths) {
-                var fromPaths = tryGetModuleNameFromPaths(ts.removeFileExtension(relativeToBaseUrl), importRelativeToBaseUrl, paths);
-                if (fromPaths) {
-                    return [fromPaths];
-                }
-            }
-            if (preferences.importModuleSpecifierPreference === "non-relative") {
-                return [importRelativeToBaseUrl];
-            }
-            if (preferences.importModuleSpecifierPreference !== undefined)
-                ts.Debug.assertNever(preferences.importModuleSpecifierPreference);
-            if (isPathRelativeToParent(relativeToBaseUrl)) {
-                return [relativePath];
-            }
-            /*
-            Prefer a relative import over a baseUrl import if it doesn't traverse up to baseUrl.
-    
-            Suppose we have:
-                baseUrl = /base
-                sourceDirectory = /base/a/b
-                moduleFileName = /base/foo/bar
-            Then:
-                relativePath = ../../foo/bar
-                getRelativePathNParents(relativePath) = 2
-                pathFromSourceToBaseUrl = ../../
-                getRelativePathNParents(pathFromSourceToBaseUrl) = 2
-                2 < 2 = false
-            In this case we should prefer using the baseUrl path "/a/b" instead of the relative path "../../foo/bar".
-    
-            Suppose we have:
-                baseUrl = /base
-                sourceDirectory = /base/foo/a
-                moduleFileName = /base/foo/bar
-            Then:
-                relativePath = ../a
-                getRelativePathNParents(relativePath) = 1
-                pathFromSourceToBaseUrl = ../../
-                getRelativePathNParents(pathFromSourceToBaseUrl) = 2
-                1 < 2 = true
-            In this case we should prefer using the relative path "../a" instead of the baseUrl path "foo/a".
-            */
-            var pathFromSourceToBaseUrl = ts.ensurePathIsNonModuleName(ts.getRelativePathFromDirectory(sourceDirectory, baseUrl, getCanonicalFileName));
-            var relativeFirst = getRelativePathNParents(relativePath) < getRelativePathNParents(pathFromSourceToBaseUrl);
-            return relativeFirst ? [relativePath, importRelativeToBaseUrl] : [importRelativeToBaseUrl, relativePath];
-        }
-        function usesJsExtensionOnImports(_a) {
-            var imports = _a.imports;
-            return ts.firstDefined(imports, function (_a) {
-                var text = _a.text;
-                return ts.pathIsRelative(text) ? ts.fileExtensionIs(text, ".js" /* Js */) : undefined;
-            }) || false;
-        }
-        /**
-         * Looks for a existing imports that use symlinks to this module.
-         * Only if no symlink is available, the real path will be used.
-         */
-        function getAllModulePaths(program, _a) {
-            var fileName = _a.fileName;
-            var symlinks = ts.mapDefined(program.getSourceFiles(), function (sf) {
-                return sf.resolvedModules && ts.firstDefinedIterator(sf.resolvedModules.values(), function (res) {
-                    return res && res.resolvedFileName === fileName ? res.originalPath : undefined;
-                });
-            });
-            return symlinks.length === 0 ? [fileName] : symlinks;
-        }
-        function getRelativePathNParents(relativePath) {
-            var components = ts.getPathComponents(relativePath);
-            if (components[0] || components.length === 1)
-                return 0;
-            for (var i = 1; i < components.length; i++) {
-                if (components[i] !== "..")
-                    return i - 1;
-            }
-            return components.length - 1;
-        }
-        function tryGetModuleNameFromAmbientModule(moduleSymbol) {
-            var decl = moduleSymbol.valueDeclaration;
-            if (ts.isModuleDeclaration(decl) && ts.isStringLiteral(decl.name)) {
-                return decl.name.text;
-            }
-        }
-        function tryGetModuleNameFromPaths(relativeToBaseUrlWithIndex, relativeToBaseUrl, paths) {
-            for (var key in paths) {
-                for (var _i = 0, _a = paths[key]; _i < _a.length; _i++) {
-                    var patternText_1 = _a[_i];
-                    var pattern = ts.removeFileExtension(ts.normalizePath(patternText_1));
-                    var indexOfStar = pattern.indexOf("*");
-                    if (indexOfStar === 0 && pattern.length === 1) {
-                        continue;
-                    }
-                    else if (indexOfStar !== -1) {
-                        var prefix = pattern.substr(0, indexOfStar);
-                        var suffix = pattern.substr(indexOfStar + 1);
-                        if (relativeToBaseUrl.length >= prefix.length + suffix.length &&
-                            ts.startsWith(relativeToBaseUrl, prefix) &&
-                            ts.endsWith(relativeToBaseUrl, suffix)) {
-                            var matchedStar = relativeToBaseUrl.substr(prefix.length, relativeToBaseUrl.length - suffix.length);
-                            return key.replace("*", matchedStar);
-                        }
-                    }
-                    else if (pattern === relativeToBaseUrl || pattern === relativeToBaseUrlWithIndex) {
-                        return key;
-                    }
-                }
-            }
-        }
-        function tryGetModuleNameFromRootDirs(rootDirs, moduleFileName, sourceDirectory, getCanonicalFileName) {
-            var normalizedTargetPath = getPathRelativeToRootDirs(moduleFileName, rootDirs, getCanonicalFileName);
-            if (normalizedTargetPath === undefined) {
-                return undefined;
-            }
-            var normalizedSourcePath = getPathRelativeToRootDirs(sourceDirectory, rootDirs, getCanonicalFileName);
-            var relativePath = normalizedSourcePath !== undefined ? ts.ensurePathIsNonModuleName(ts.getRelativePathFromDirectory(normalizedSourcePath, normalizedTargetPath, getCanonicalFileName)) : normalizedTargetPath;
-            return ts.removeFileExtension(relativePath);
-        }
-        function tryGetModuleNameFromTypeRoots(options, host, getCanonicalFileName, moduleFileName, addJsExtension) {
-            var roots = ts.getEffectiveTypeRoots(options, host);
-            return ts.firstDefined(roots, function (unNormalizedTypeRoot) {
-                var typeRoot = ts.toPath(unNormalizedTypeRoot, /*basePath*/ undefined, getCanonicalFileName);
-                if (ts.startsWith(moduleFileName, typeRoot)) {
-                    // For a type definition, we can strip `/index` even with classic resolution.
-                    return removeExtensionAndIndexPostFix(moduleFileName.substring(typeRoot.length + 1), ts.ModuleResolutionKind.NodeJs, addJsExtension);
-                }
-            });
-        }
-        function tryGetModuleNameAsNodeModule(options, moduleFileName, host, getCanonicalFileName, sourceDirectory) {
-            if (ts.getEmitModuleResolutionKind(options) !== ts.ModuleResolutionKind.NodeJs) {
-                // nothing to do here
-                return undefined;
-            }
-            var parts = getNodeModulePathParts(moduleFileName);
-            if (!parts) {
-                return undefined;
-            }
-            // Simplify the full file path to something that can be resolved by Node.
-            // If the module could be imported by a directory name, use that directory's name
-            var moduleSpecifier = getDirectoryOrExtensionlessFileName(moduleFileName);
-            // Get a path that's relative to node_modules or the importing file's path
-            // if node_modules folder is in this folder or any of its parent folders, no need to keep it.
-            if (!ts.startsWith(sourceDirectory, moduleSpecifier.substring(0, parts.topLevelNodeModulesIndex)))
-                return undefined;
-            // If the module was found in @types, get the actual Node package name
-            return ts.getPackageNameFromAtTypesDirectory(moduleSpecifier.substring(parts.topLevelPackageNameIndex + 1));
-            function getDirectoryOrExtensionlessFileName(path) {
-                // If the file is the main module, it can be imported by the package name
-                var packageRootPath = path.substring(0, parts.packageRootIndex);
-                var packageJsonPath = ts.combinePaths(packageRootPath, "package.json");
-                if (host.fileExists(packageJsonPath)) { // TODO: GH#18217
-                    var packageJsonContent = JSON.parse(host.readFile(packageJsonPath));
-                    if (packageJsonContent) {
-                        var mainFileRelative = packageJsonContent.typings || packageJsonContent.types || packageJsonContent.main;
-                        if (mainFileRelative) {
-                            var mainExportFile = ts.toPath(mainFileRelative, packageRootPath, getCanonicalFileName);
-                            if (mainExportFile === getCanonicalFileName(path)) {
-                                return packageRootPath;
-                            }
-                        }
-                    }
-                }
-                // We still have a file name - remove the extension
-                var fullModulePathWithoutExtension = ts.removeFileExtension(path);
-                // If the file is /index, it can be imported by its directory name
-                if (getCanonicalFileName(fullModulePathWithoutExtension.substring(parts.fileNameIndex)) === "/index") {
-                    return fullModulePathWithoutExtension.substring(0, parts.fileNameIndex);
-                }
-                return fullModulePathWithoutExtension;
-            }
-        }
-        function getNodeModulePathParts(fullPath) {
-            // If fullPath can't be valid module file within node_modules, returns undefined.
-            // Example of expected pattern: /base/path/node_modules/[@scope/otherpackage/@otherscope/node_modules/]package/[subdirectory/]file.js
-            // Returns indices:                       ^            ^                                                      ^             ^
-            var topLevelNodeModulesIndex = 0;
-            var topLevelPackageNameIndex = 0;
-            var packageRootIndex = 0;
-            var fileNameIndex = 0;
-            var States;
-            (function (States) {
-                States[States["BeforeNodeModules"] = 0] = "BeforeNodeModules";
-                States[States["NodeModules"] = 1] = "NodeModules";
-                States[States["Scope"] = 2] = "Scope";
-                States[States["PackageContent"] = 3] = "PackageContent";
-            })(States || (States = {}));
-            var partStart = 0;
-            var partEnd = 0;
-            var state = 0 /* BeforeNodeModules */;
-            while (partEnd >= 0) {
-                partStart = partEnd;
-                partEnd = fullPath.indexOf("/", partStart + 1);
-                switch (state) {
-                    case 0 /* BeforeNodeModules */:
-                        if (fullPath.indexOf("/node_modules/", partStart) === partStart) {
-                            topLevelNodeModulesIndex = partStart;
-                            topLevelPackageNameIndex = partEnd;
-                            state = 1 /* NodeModules */;
-                        }
-                        break;
-                    case 1 /* NodeModules */:
-                    case 2 /* Scope */:
-                        if (state === 1 /* NodeModules */ && fullPath.charAt(partStart + 1) === "@") {
-                            state = 2 /* Scope */;
-                        }
-                        else {
-                            packageRootIndex = partEnd;
-                            state = 3 /* PackageContent */;
-                        }
-                        break;
-                    case 3 /* PackageContent */:
-                        if (fullPath.indexOf("/node_modules/", partStart) === partStart) {
-                            state = 1 /* NodeModules */;
-                        }
-                        else {
-                            state = 3 /* PackageContent */;
-                        }
-                        break;
-                }
-            }
-            fileNameIndex = partStart;
-            return state > 1 /* NodeModules */ ? { topLevelNodeModulesIndex: topLevelNodeModulesIndex, topLevelPackageNameIndex: topLevelPackageNameIndex, packageRootIndex: packageRootIndex, fileNameIndex: fileNameIndex } : undefined;
-        }
-        function getPathRelativeToRootDirs(path, rootDirs, getCanonicalFileName) {
-            return ts.firstDefined(rootDirs, function (rootDir) {
-                var relativePath = getRelativePathIfInDirectory(path, rootDir, getCanonicalFileName); // TODO: GH#18217
-                return isPathRelativeToParent(relativePath) ? undefined : relativePath;
-            });
-        }
-        function removeExtensionAndIndexPostFix(fileName, moduleResolutionKind, addJsExtension) {
-            var noExtension = ts.removeFileExtension(fileName);
-            return addJsExtension
-                ? noExtension + ".js"
-                : moduleResolutionKind === ts.ModuleResolutionKind.NodeJs
-                    ? ts.removeSuffix(noExtension, "/index")
-                    : noExtension;
-        }
-        function getRelativePathIfInDirectory(path, directoryPath, getCanonicalFileName) {
-            var relativePath = ts.getRelativePathToDirectoryOrUrl(directoryPath, path, directoryPath, getCanonicalFileName, /*isAbsolutePathAnUrl*/ false);
-            return ts.isRootedDiskPath(relativePath) ? undefined : relativePath;
-        }
-        function isPathRelativeToParent(path) {
-            return ts.startsWith(path, "..");
-        }
-    })(moduleSpecifiers = ts.moduleSpecifiers || (ts.moduleSpecifiers = {}));
-})(ts || (ts = {}));
 /* @internal */
 var ts;
 (function (ts) {
@@ -104226,7 +105652,7 @@ var ts;
             }
         }
         function doChange(changes, sourceFile, info, preferences) {
-            changes.replaceNode(sourceFile, info.importNode, ts.makeImport(info.name, /*namedImports*/ undefined, info.moduleSpecifier, preferences));
+            changes.replaceNode(sourceFile, info.importNode, ts.makeImport(info.name, /*namedImports*/ undefined, info.moduleSpecifier, ts.getQuotePreference(sourceFile, preferences)));
         }
     })(codefix = ts.codefix || (ts.codefix = {}));
 })(ts || (ts = {}));
@@ -104412,7 +105838,7 @@ var ts;
                 });
                 var namespaceImportName = namespaceNameConflicts ? ts.getUniqueName(preferredName, sourceFile) : preferredName;
                 var neededNamedImports = [];
-                var _loop_22 = function (element) {
+                var _loop_11 = function (element) {
                     var propertyName = (element.propertyName || element.name).text;
                     ts.FindAllReferences.Core.eachSymbolReferenceInFile(element.name, checker, sourceFile, function (id) {
                         var access = ts.createPropertyAccess(ts.createIdentifier(namespaceImportName), propertyName);
@@ -104431,7 +105857,7 @@ var ts;
                 };
                 for (var _i = 0, _a = toConvert.elements; _i < _a.length; _i++) {
                     var element = _a[_i];
-                    _loop_22(element);
+                    _loop_11(element);
                 }
                 changes.replaceNode(sourceFile, toConvert, ts.createNamespaceImport(ts.createIdentifier(namespaceImportName)));
                 if (neededNamedImports.length) {
@@ -105490,8 +106916,8 @@ var ts;
                 ts.Debug.assert(members.length > 0); // There must be at least one child, since we extracted from one.
                 var prevMember;
                 var allProperties = true;
-                for (var _i = 0, members_7 = members; _i < members_7.length; _i++) {
-                    var member = members_7[_i];
+                for (var _i = 0, members_2 = members; _i < members_2.length; _i++) {
+                    var member = members_2[_i];
                     if (member.pos > maxPos) {
                         return prevMember || members[0];
                     }
@@ -105665,7 +107091,7 @@ var ts;
                         : ts.getEnclosingBlockScopeContainer(scopes[0]);
                     ts.forEachChild(containingLexicalScopeOfExtraction, checkForUsedDeclarations);
                 }
-                var _loop_23 = function (i) {
+                var _loop_12 = function (i) {
                     var scopeUsages = usagesPerScope[i];
                     // Special case: in the innermost scope, all usages are available.
                     // (The computed value reflects the value at the top-level of the scope, but the
@@ -105705,7 +107131,7 @@ var ts;
                     }
                 };
                 for (var i = 0; i < scopes.length; i++) {
-                    _loop_23(i);
+                    _loop_12(i);
                 }
                 return { target: target, usagesPerScope: usagesPerScope, functionErrorsPerScope: functionErrorsPerScope, constantErrorsPerScope: constantErrorsPerScope, exposedVariableDeclarations: exposedVariableDeclarations };
                 function isInGenericContext(node) {
@@ -106230,14 +107656,15 @@ var ts;
                 return toMove.all;
             }
             var useEs6ModuleSyntax = !!oldFile.externalModuleIndicator;
-            var importsFromNewFile = createOldFileImportsFromNewFile(usage.oldFileImportsFromNewFile, newModuleName, useEs6ModuleSyntax, preferences);
+            var quotePreference = ts.getQuotePreference(oldFile, preferences);
+            var importsFromNewFile = createOldFileImportsFromNewFile(usage.oldFileImportsFromNewFile, newModuleName, useEs6ModuleSyntax, quotePreference);
             if (importsFromNewFile) {
                 changes.insertNodeBefore(oldFile, oldFile.statements[0], importsFromNewFile, /*blankLineBetween*/ true);
             }
             deleteUnusedOldImports(oldFile, toMove.all, changes, usage.unusedImportsFromOldFile, checker);
             deleteMovedStatements(oldFile, toMove.ranges, changes);
             updateImportsInOtherFiles(changes, program, oldFile, usage.movedSymbols, newModuleName);
-            return getNewFileImportsAndAddExportInOldFile(oldFile, usage.oldImportsNeededByNewFile, usage.newFileImportsFromOldFile, changes, checker, useEs6ModuleSyntax, preferences).concat(addExports(oldFile, toMove.all, usage.oldFileImportsFromNewFile, useEs6ModuleSyntax));
+            return getNewFileImportsAndAddExportInOldFile(oldFile, usage.oldImportsNeededByNewFile, usage.newFileImportsFromOldFile, changes, checker, useEs6ModuleSyntax, quotePreference).concat(addExports(oldFile, toMove.all, usage.oldFileImportsFromNewFile, useEs6ModuleSyntax));
         }
         function deleteMovedStatements(sourceFile, moved, changes) {
             for (var _i = 0, moved_1 = moved; _i < moved_1.length; _i++) {
@@ -106255,10 +107682,10 @@ var ts;
         }
         function updateImportsInOtherFiles(changes, program, oldFile, movedSymbols, newModuleName) {
             var checker = program.getTypeChecker();
-            var _loop_24 = function (sourceFile) {
+            var _loop_13 = function (sourceFile) {
                 if (sourceFile === oldFile)
                     return "continue";
-                var _loop_25 = function (statement) {
+                var _loop_14 = function (statement) {
                     forEachImportInStatement(statement, function (importNode) {
                         if (checker.getSymbolAtLocation(moduleSpecifierFromImport(importNode)) !== oldFile.symbol)
                             return;
@@ -106280,12 +107707,12 @@ var ts;
                 };
                 for (var _i = 0, _a = sourceFile.statements; _i < _a.length; _i++) {
                     var statement = _a[_i];
-                    _loop_25(statement);
+                    _loop_14(statement);
                 }
             };
             for (var _i = 0, _a = program.getSourceFiles(); _i < _a.length; _i++) {
                 var sourceFile = _a[_i];
-                _loop_24(sourceFile);
+                _loop_13(sourceFile);
             }
         }
         function getNamespaceLikeImport(node) {
@@ -106361,7 +107788,7 @@ var ts;
                 }
             }
         }
-        function createOldFileImportsFromNewFile(newFileNeedExport, newFileNameWithExtension, useEs6Imports, preferences) {
+        function createOldFileImportsFromNewFile(newFileNeedExport, newFileNameWithExtension, useEs6Imports, quotePreference) {
             var defaultImport;
             var imports = [];
             newFileNeedExport.forEach(function (symbol) {
@@ -106372,13 +107799,13 @@ var ts;
                     imports.push(symbol.name);
                 }
             });
-            return makeImportOrRequire(defaultImport, imports, newFileNameWithExtension, useEs6Imports, preferences);
+            return makeImportOrRequire(defaultImport, imports, newFileNameWithExtension, useEs6Imports, quotePreference);
         }
-        function makeImportOrRequire(defaultImport, imports, path, useEs6Imports, preferences) {
+        function makeImportOrRequire(defaultImport, imports, path, useEs6Imports, quotePreference) {
             path = ts.ensurePathIsNonModuleName(path);
             if (useEs6Imports) {
                 var specifiers = imports.map(function (i) { return ts.createImportSpecifier(/*propertyName*/ undefined, ts.createIdentifier(i)); });
-                return ts.makeImportIfNecessary(defaultImport, specifiers, path, preferences);
+                return ts.makeImportIfNecessary(defaultImport, specifiers, path, quotePreference);
             }
             else {
                 ts.Debug.assert(!defaultImport); // If there's a default export, it should have been an es6 module.
@@ -106400,9 +107827,9 @@ var ts;
                 if (isTopLevelDeclarationStatement(statement) &&
                     !isExported(sourceFile, statement, useEs6Exports) &&
                     forEachTopLevelDeclaration(statement, function (d) { return needExport.has(ts.Debug.assertDefined(d.symbol)); })) {
-                    var exports_2 = addExport(statement, useEs6Exports);
-                    if (exports_2)
-                        return exports_2;
+                    var exports = addExport(statement, useEs6Exports);
+                    if (exports)
+                        return exports;
                 }
                 return statement;
             });
@@ -106477,7 +107904,7 @@ var ts;
                     break;
             }
         }
-        function getNewFileImportsAndAddExportInOldFile(oldFile, importsToCopy, newFileImportsFromOldFile, changes, checker, useEs6ModuleSyntax, preferences) {
+        function getNewFileImportsAndAddExportInOldFile(oldFile, importsToCopy, newFileImportsFromOldFile, changes, checker, useEs6ModuleSyntax, quotePreference) {
             var copiedOldImports = [];
             for (var _i = 0, _a = oldFile.statements; _i < _a.length; _i++) {
                 var oldStatement = _a[_i];
@@ -106509,7 +107936,7 @@ var ts;
                     }
                 }
             });
-            ts.append(copiedOldImports, makeImportOrRequire(oldFileDefault, oldFileNamedImports, ts.removeFileExtension(ts.getBaseFileName(oldFile.fileName)), useEs6ModuleSyntax, preferences));
+            ts.append(copiedOldImports, makeImportOrRequire(oldFileDefault, oldFileNamedImports, ts.removeFileExtension(ts.getBaseFileName(oldFile.fileName)), useEs6ModuleSyntax, quotePreference));
             return copiedOldImports;
         }
         function makeUniqueModuleName(moduleName, extension, inDirectory, host) {
@@ -107188,8 +108615,8 @@ var ts;
         var list = createNode(299 /* SyntaxList */, nodes.pos, nodes.end, parent);
         list._children = [];
         var pos = nodes.pos;
-        for (var _i = 0, nodes_7 = nodes; _i < nodes_7.length; _i++) {
-            var node = nodes_7[_i];
+        for (var _i = 0, nodes_1 = nodes; _i < nodes_1.length; _i++) {
+            var node = nodes_1[_i];
             addSyntheticNodes(list._children, pos, node.pos, parent);
             list._children.push(node);
             pos = node.end;
@@ -107372,7 +108799,7 @@ var ts;
             return !!(this.flags & 786432 /* UnionOrIntersection */);
         };
         TypeObject.prototype.isLiteral = function () {
-            return !!(this.flags & 448 /* Literal */);
+            return !!(this.flags & 192 /* StringOrNumberLiteral */);
         };
         TypeObject.prototype.isStringLiteral = function () {
             return !!(this.flags & 64 /* StringLiteral */);
@@ -107431,8 +108858,8 @@ var ts;
             return ts.emptyArray;
         var doc = ts.JsDoc.getJsDocCommentsFromDeclarations(declarations);
         if (doc.length === 0 || declarations.some(hasJSDocInheritDocTag)) {
-            for (var _i = 0, declarations_14 = declarations; _i < declarations_14.length; _i++) {
-                var declaration = declarations_14[_i];
+            for (var _i = 0, declarations_5 = declarations; _i < declarations_5.length; _i++) {
+                var declaration = declarations_5[_i];
                 var inheritedDocs = findInheritedJSDocComments(declaration, declaration.symbol.name, checker); // TODO: GH#18217
                 // TODO: GH#16312 Return a ReadonlyArray, avoid copying inheritedDocs
                 if (inheritedDocs)
@@ -107927,9 +109354,9 @@ var ts;
     }
     ts.createSourceFileLikeCache = createSourceFileLikeCache;
     function createLanguageService(host, documentRegistry, syntaxOnly) {
-        var _a;
         if (documentRegistry === void 0) { documentRegistry = ts.createDocumentRegistry(host.useCaseSensitiveFileNames && host.useCaseSensitiveFileNames(), host.getCurrentDirectory()); }
         if (syntaxOnly === void 0) { syntaxOnly = false; }
+        var _a;
         var syntaxTreeCache = new SyntaxTreeCache(host);
         var program;
         var lastProjectVersion;
@@ -108186,7 +109613,7 @@ var ts;
         function getQuickInfoAtPosition(fileName, position) {
             synchronizeHostData();
             var sourceFile = getValidSourceFile(fileName);
-            var node = ts.getTouchingPropertyName(sourceFile, position, /*includeJsDocComment*/ true);
+            var node = ts.getTouchingPropertyName(sourceFile, position);
             if (node === sourceFile) {
                 // Avoid giving quickInfo for the sourceFile as a whole.
                 return undefined;
@@ -108208,14 +109635,14 @@ var ts;
                     case 174 /* ThisType */:
                     case 97 /* SuperKeyword */:
                         // For the identifiers/this/super etc get the type at position
-                        var type_4 = typeChecker.getTypeAtLocation(node);
-                        return type_4 && {
+                        var type_1 = typeChecker.getTypeAtLocation(node);
+                        return type_1 && {
                             kind: "" /* unknown */,
                             kindModifiers: "" /* none */,
                             textSpan: ts.createTextSpanFromNode(node, sourceFile),
-                            displayParts: typeChecker.runWithCancellationToken(cancellationToken, function (typeChecker) { return ts.typeToDisplayParts(typeChecker, type_4, ts.getContainerNode(node)); }),
-                            documentation: type_4.symbol ? type_4.symbol.getDocumentationComment(typeChecker) : undefined,
-                            tags: type_4.symbol ? type_4.symbol.getJsDocTags() : undefined
+                            displayParts: typeChecker.runWithCancellationToken(cancellationToken, function (typeChecker) { return ts.typeToDisplayParts(typeChecker, type_1, ts.getContainerNode(node)); }),
+                            documentation: type_1.symbol ? type_1.symbol.getDocumentationComment(typeChecker) : undefined,
+                            tags: type_1.symbol ? type_1.symbol.getJsDocTags() : undefined
                         };
                 }
                 return undefined;
@@ -108324,15 +109751,15 @@ var ts;
                 if (original === void 0) { original = input; }
                 var info = extract(input);
                 if (ts.endsWith(info.fileName, ".d.ts" /* Dts */)) {
-                    var file_18 = program.getSourceFile(info.fileName);
-                    if (!file_18) {
+                    var file = program.getSourceFile(info.fileName);
+                    if (!file) {
                         var path = ts.toPath(info.fileName, currentDirectory, getCanonicalFileName);
-                        file_18 = sourcemappedFileCache.get(path);
+                        file = sourcemappedFileCache.get(path);
                     }
-                    if (!file_18) {
+                    if (!file) {
                         return input;
                     }
-                    var mapper = getSourceMapper(info.fileName, file_18);
+                    var mapper = getSourceMapper(info.fileName, file);
                     var newLoc = mapper.getOriginalPosition(info);
                     if (newLoc === info)
                         return input;
@@ -108464,7 +109891,7 @@ var ts;
         function getNameOrDottedNameSpan(fileName, startPos, _endPos) {
             var sourceFile = syntaxTreeCache.getCurrentSourceFile(fileName);
             // Get node at the location
-            var node = ts.getTouchingPropertyName(sourceFile, startPos, /*includeJsDocComment*/ false);
+            var node = ts.getTouchingPropertyName(sourceFile, startPos);
             if (node === sourceFile) {
                 return undefined;
             }
@@ -108976,20 +110403,20 @@ var ts;
     function getPropertySymbolsFromType(type, propName) {
         var name = ts.unescapeLeadingUnderscores(ts.getTextOfPropertyName(propName));
         if (name && type) {
-            var result_7 = [];
+            var result_2 = [];
             var symbol = type.getProperty(name);
             if (type.flags & 262144 /* Union */) {
                 ts.forEach(type.types, function (t) {
                     var symbol = t.getProperty(name);
                     if (symbol) {
-                        result_7.push(symbol);
+                        result_2.push(symbol);
                     }
                 });
-                return result_7;
+                return result_2;
             }
             if (symbol) {
-                result_7.push(symbol);
-                return result_7;
+                result_2.push(symbol);
+                return result_2;
             }
         }
         return undefined;
@@ -110277,7 +111704,8 @@ var ts;
                     importedFiles: _this.convertFileReferences(result.importedFiles),
                     ambientExternalModules: result.ambientExternalModules,
                     isLibFile: result.isLibFile,
-                    typeReferenceDirectives: _this.convertFileReferences(result.typeReferenceDirectives)
+                    typeReferenceDirectives: _this.convertFileReferences(result.typeReferenceDirectives),
+                    libReferenceDirectives: _this.convertFileReferences(result.libReferenceDirectives)
                 };
             });
         };
@@ -110293,8 +111721,8 @@ var ts;
                 return undefined;
             }
             var result = [];
-            for (var _i = 0, refs_2 = refs; _i < refs_2.length; _i++) {
-                var ref = refs_2[_i];
+            for (var _i = 0, refs_1 = refs; _i < refs_1.length; _i++) {
+                var ref = refs_1[_i];
                 result.push({
                     path: ts.normalizeSlashes(ref.fileName),
                     position: ref.pos,
@@ -110416,3 +111844,6 @@ var TypeScript;
 // TODO: it should be moved into a namespace though.
 /* @internal */
 var toolsVersion = ts.versionMajorMinor;
+//# sourceMappingURL=services.js.map
+// Delete soon
+//# sourceMappingURL=typescriptServices.js.map
\ No newline at end of file
diff --git a/lib/typescriptServices.d.ts b/lib/typescriptServices.d.ts
index 68ee36c20e0..52831570333 100644
--- a/lib/typescriptServices.d.ts
+++ b/lib/typescriptServices.d.ts
@@ -715,10 +715,14 @@ declare namespace ts {
         kind: SyntaxKind.ThisType;
     }
     type FunctionOrConstructorTypeNode = FunctionTypeNode | ConstructorTypeNode;
-    interface FunctionTypeNode extends TypeNode, SignatureDeclarationBase {
+    interface FunctionOrConstructorTypeNodeBase extends TypeNode, SignatureDeclarationBase {
+        kind: SyntaxKind.FunctionType | SyntaxKind.ConstructorType;
+        type: TypeNode;
+    }
+    interface FunctionTypeNode extends FunctionOrConstructorTypeNodeBase {
         kind: SyntaxKind.FunctionType;
     }
-    interface ConstructorTypeNode extends TypeNode, SignatureDeclarationBase {
+    interface ConstructorTypeNode extends FunctionOrConstructorTypeNodeBase {
         kind: SyntaxKind.ConstructorType;
     }
     interface NodeWithTypeArguments extends TypeNode {
@@ -1648,6 +1652,7 @@ declare namespace ts {
         moduleName?: string;
         referencedFiles: ReadonlyArray<FileReference>;
         typeReferenceDirectives: ReadonlyArray<FileReference>;
+        libReferenceDirectives: ReadonlyArray<FileReference>;
         languageVariant: LanguageVariant;
         isDeclarationFile: boolean;
         /**
@@ -1669,11 +1674,14 @@ declare namespace ts {
     interface InputFiles extends Node {
         kind: SyntaxKind.InputFiles;
         javascriptText: string;
+        javascriptMapText?: string;
         declarationText: string;
+        declarationMapText?: string;
     }
     interface UnparsedSource extends Node {
         kind: SyntaxKind.UnparsedSource;
         text: string;
+        sourceMapText?: string;
     }
     interface JsonSourceFile extends SourceFile {
         statements: NodeArray<JsonObjectExpressionStatement>;
@@ -2656,6 +2664,9 @@ declare namespace ts {
         resolveTypeReferenceDirectives?(typeReferenceDirectiveNames: string[], containingFile: string): ResolvedTypeReferenceDirective[];
         getEnvironmentVariable?(name: string): string | undefined;
         createHash?(data: string): string;
+        getModifiedTime?(fileName: string): Date;
+        setModifiedTime?(fileName: string, date: Date): void;
+        deleteFile?(fileName: string): void;
     }
     interface SourceMapRange extends TextRange {
         source?: SourceMapSource;
@@ -2876,6 +2887,10 @@ declare namespace ts {
         omitTrailingSemicolon?: boolean;
         noEmitHelpers?: boolean;
     }
+    interface GetEffectiveTypeRootsHost {
+        directoryExists?(directoryName: string): boolean;
+        getCurrentDirectory?(): string;
+    }
     /** @deprecated See comment on SymbolWriter */
     interface SymbolTracker {
         trackSymbol?(symbol: Symbol, enclosingDeclaration?: Node, meaning?: SymbolFlags): void;
@@ -3006,6 +3021,8 @@ declare namespace ts {
         getDirectories(path: string): string[];
         readDirectory(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
         getModifiedTime?(path: string): Date;
+        setModifiedTime?(path: string, time: Date): void;
+        deleteFile?(path: string): void;
         /**
          * A good implementation is node.js' `crypto.createHash`. (https://nodejs.org/api/crypto.html#crypto_crypto_createhash_algorithm)
          */
@@ -3371,6 +3388,7 @@ declare namespace ts {
     function isEnumMember(node: Node): node is EnumMember;
     function isSourceFile(node: Node): node is SourceFile;
     function isBundle(node: Node): node is Bundle;
+    function isUnparsedSource(node: Node): node is UnparsedSource;
     function isJSDocTypeExpression(node: Node): node is JSDocTypeExpression;
     function isJSDocAllType(node: JSDocAllType): node is JSDocAllType;
     function isJSDocUnknownType(node: Node): node is JSDocUnknownType;
@@ -3467,10 +3485,6 @@ declare namespace ts {
     function updateSourceFile(sourceFile: SourceFile, newText: string, textChangeRange: TextChangeRange, aggressiveChecks?: boolean): SourceFile;
 }
 declare namespace ts {
-    interface GetEffectiveTypeRootsHost {
-        directoryExists?(directoryName: string): boolean;
-        getCurrentDirectory?(): string;
-    }
     function getEffectiveTypeRoots(options: CompilerOptions, host: GetEffectiveTypeRootsHost): string[] | undefined;
     /**
      * @param {string | undefined} containingFile - file that contains type reference directive, can be undefined if containing file is unknown.
@@ -3801,7 +3815,7 @@ declare namespace ts {
     function updateSpreadAssignment(node: SpreadAssignment, expression: Expression): SpreadAssignment;
     function createEnumMember(name: string | PropertyName, initializer?: Expression): EnumMember;
     function updateEnumMember(node: EnumMember, name: PropertyName, initializer: Expression | undefined): EnumMember;
-    function updateSourceFileNode(node: SourceFile, statements: ReadonlyArray<Statement>, isDeclarationFile?: boolean, referencedFiles?: SourceFile["referencedFiles"], typeReferences?: SourceFile["typeReferenceDirectives"], hasNoDefaultLib?: boolean): SourceFile;
+    function updateSourceFileNode(node: SourceFile, statements: ReadonlyArray<Statement>, isDeclarationFile?: boolean, referencedFiles?: SourceFile["referencedFiles"], typeReferences?: SourceFile["typeReferenceDirectives"], hasNoDefaultLib?: boolean, libReferences?: SourceFile["libReferenceDirectives"]): SourceFile;
     /**
      * Creates a shallow, memberwise clone of a node for mutation.
      */
@@ -3826,8 +3840,8 @@ declare namespace ts {
     function createCommaList(elements: ReadonlyArray<Expression>): CommaListExpression;
     function updateCommaList(node: CommaListExpression, elements: ReadonlyArray<Expression>): CommaListExpression;
     function createBundle(sourceFiles: ReadonlyArray<SourceFile>, prepends?: ReadonlyArray<UnparsedSource | InputFiles>): Bundle;
-    function createUnparsedSourceFile(text: string): UnparsedSource;
-    function createInputFiles(javascript: string, declaration: string): InputFiles;
+    function createUnparsedSourceFile(text: string, map?: string): UnparsedSource;
+    function createInputFiles(javascript: string, declaration: string, javascriptMapText?: string, declarationMapText?: string): InputFiles;
     function updateBundle(node: Bundle, sourceFiles: ReadonlyArray<SourceFile>, prepends?: ReadonlyArray<UnparsedSource>): Bundle;
     function createImmediatelyInvokedFunctionExpression(statements: ReadonlyArray<Statement>): CallExpression;
     function createImmediatelyInvokedFunctionExpression(statements: ReadonlyArray<Statement>, param: ParameterDeclaration, paramValue: Expression): CallExpression;
@@ -4048,6 +4062,10 @@ declare namespace ts {
      * @returns A 'Program' object.
      */
     function createProgram(rootNames: ReadonlyArray<string>, options: CompilerOptions, host?: CompilerHost, oldProgram?: Program, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>): Program;
+    /**
+     * Returns the target config filename of a project reference
+     */
+    function resolveProjectReferencePath(host: CompilerHost, ref: ProjectReference): string | undefined;
 }
 declare namespace ts {
     interface EmitOutput {
@@ -4467,6 +4485,7 @@ declare namespace ts {
     interface PreProcessedFileInfo {
         referencedFiles: FileReference[];
         typeReferenceDirectives: FileReference[];
+        libReferenceDirectives: FileReference[];
         importedFiles: FileReference[];
         ambientExternalModules?: string[];
         isLibFile: boolean;
@@ -4651,6 +4670,7 @@ declare namespace ts {
          * There will be more than one if this is the result of merging.
          */
         spans: TextSpan[];
+        nameSpan: TextSpan | undefined;
         /** Present if non-empty */
         childItems?: NavigationTree[];
     }
diff --git a/lib/typescriptServices.js b/lib/typescriptServices.js
index 84491873e2b..3c2725eeda5 100644
--- a/lib/typescriptServices.js
+++ b/lib/typescriptServices.js
@@ -13,6 +13,1978 @@ See the Apache Version 2.0 License for specific language governing permissions
 and limitations under the License.
 ***************************************************************************** */
 
+"use strict";"use strict";
+/*@internal*/
+var ts;
+(function (ts) {
+    /** Gets a timestamp with (at least) ms resolution */
+    ts.timestamp = typeof performance !== "undefined" && performance.now ? function () { return performance.now(); } : Date.now ? Date.now : function () { return +(new Date()); };
+})(ts || (ts = {}));
+/*@internal*/
+/** Performance measurements for the compiler. */
+(function (ts) {
+    var performance;
+    (function (performance) {
+        // NOTE: cannot use ts.noop as core.ts loads after this
+        var profilerEvent = typeof onProfilerEvent === "function" && onProfilerEvent.profiler === true ? onProfilerEvent : function () { };
+        var enabled = false;
+        var profilerStart = 0;
+        var counts;
+        var marks;
+        var measures;
+        /**
+         * Marks a performance event.
+         *
+         * @param markName The name of the mark.
+         */
+        function mark(markName) {
+            if (enabled) {
+                marks.set(markName, ts.timestamp());
+                counts.set(markName, (counts.get(markName) || 0) + 1);
+                profilerEvent(markName);
+            }
+        }
+        performance.mark = mark;
+        /**
+         * Adds a performance measurement with the specified name.
+         *
+         * @param measureName The name of the performance measurement.
+         * @param startMarkName The name of the starting mark. If not supplied, the point at which the
+         *      profiler was enabled is used.
+         * @param endMarkName The name of the ending mark. If not supplied, the current timestamp is
+         *      used.
+         */
+        function measure(measureName, startMarkName, endMarkName) {
+            if (enabled) {
+                var end = endMarkName && marks.get(endMarkName) || ts.timestamp();
+                var start = startMarkName && marks.get(startMarkName) || profilerStart;
+                measures.set(measureName, (measures.get(measureName) || 0) + (end - start));
+            }
+        }
+        performance.measure = measure;
+        /**
+         * Gets the number of times a marker was encountered.
+         *
+         * @param markName The name of the mark.
+         */
+        function getCount(markName) {
+            return counts && counts.get(markName) || 0;
+        }
+        performance.getCount = getCount;
+        /**
+         * Gets the total duration of all measurements with the supplied name.
+         *
+         * @param measureName The name of the measure whose durations should be accumulated.
+         */
+        function getDuration(measureName) {
+            return measures && measures.get(measureName) || 0;
+        }
+        performance.getDuration = getDuration;
+        /**
+         * Iterate over each measure, performing some action
+         *
+         * @param cb The action to perform for each measure
+         */
+        function forEachMeasure(cb) {
+            measures.forEach(function (measure, key) {
+                cb(key, measure);
+            });
+        }
+        performance.forEachMeasure = forEachMeasure;
+        /** Enables (and resets) performance measurements for the compiler. */
+        function enable() {
+            counts = ts.createMap();
+            marks = ts.createMap();
+            measures = ts.createMap();
+            enabled = true;
+            profilerStart = ts.timestamp();
+        }
+        performance.enable = enable;
+        /** Disables performance measurements for the compiler. */
+        function disable() {
+            enabled = false;
+        }
+        performance.disable = disable;
+    })(performance = ts.performance || (ts.performance = {}));
+})(ts || (ts = {}));
+var ts;
+(function (ts) {
+    // WARNING: The script `configureNightly.ts` uses a regexp to parse out these values.
+    // If changing the text in this section, be sure to test `configureNightly` too.
+    ts.versionMajorMinor = "3.0";
+    /** The version of the TypeScript compiler release */
+    ts.version = ts.versionMajorMinor + ".0-dev";
+})(ts || (ts = {}));
+/* @internal */
+(function (ts) {
+    var Comparison;
+    (function (Comparison) {
+        Comparison[Comparison["LessThan"] = -1] = "LessThan";
+        Comparison[Comparison["EqualTo"] = 0] = "EqualTo";
+        Comparison[Comparison["GreaterThan"] = 1] = "GreaterThan";
+    })(Comparison = ts.Comparison || (ts.Comparison = {}));
+    /** Create a MapLike with good performance. */
+    function createDictionaryObject() {
+        var map = Object.create(/*prototype*/ null); // tslint:disable-line:no-null-keyword
+        // Using 'delete' on an object causes V8 to put the object in dictionary mode.
+        // This disables creation of hidden classes, which are expensive when an object is
+        // constantly changing shape.
+        map.__ = undefined;
+        delete map.__;
+        return map;
+    }
+    /** Create a new map. If a template object is provided, the map will copy entries from it. */
+    function createMap() {
+        return new ts.MapCtr();
+    }
+    ts.createMap = createMap;
+    function createMapFromEntries(entries) {
+        var map = createMap();
+        for (var _i = 0, entries_1 = entries; _i < entries_1.length; _i++) {
+            var _a = entries_1[_i], key = _a[0], value = _a[1];
+            map.set(key, value);
+        }
+        return map;
+    }
+    ts.createMapFromEntries = createMapFromEntries;
+    function createMapFromTemplate(template) {
+        var map = new ts.MapCtr();
+        // Copies keys/values from template. Note that for..in will not throw if
+        // template is undefined, and instead will just exit the loop.
+        for (var key in template) {
+            if (hasOwnProperty.call(template, key)) {
+                map.set(key, template[key]);
+            }
+        }
+        return map;
+    }
+    ts.createMapFromTemplate = createMapFromTemplate;
+    // Internet Explorer's Map doesn't support iteration, so don't use it.
+    // tslint:disable-next-line no-in-operator variable-name
+    ts.MapCtr = typeof Map !== "undefined" && "entries" in Map.prototype ? Map : shimMap();
+    // Keep the class inside a function so it doesn't get compiled if it's not used.
+    function shimMap() {
+        var MapIterator = /** @class */ (function () {
+            function MapIterator(data, selector) {
+                this.index = 0;
+                this.data = data;
+                this.selector = selector;
+                this.keys = Object.keys(data);
+            }
+            MapIterator.prototype.next = function () {
+                var index = this.index;
+                if (index < this.keys.length) {
+                    this.index++;
+                    return { value: this.selector(this.data, this.keys[index]), done: false };
+                }
+                return { value: undefined, done: true };
+            };
+            return MapIterator;
+        }());
+        return /** @class */ (function () {
+            function class_1() {
+                this.data = createDictionaryObject();
+                this.size = 0;
+            }
+            class_1.prototype.get = function (key) {
+                return this.data[key];
+            };
+            class_1.prototype.set = function (key, value) {
+                if (!this.has(key)) {
+                    this.size++;
+                }
+                this.data[key] = value;
+                return this;
+            };
+            class_1.prototype.has = function (key) {
+                // tslint:disable-next-line:no-in-operator
+                return key in this.data;
+            };
+            class_1.prototype.delete = function (key) {
+                if (this.has(key)) {
+                    this.size--;
+                    delete this.data[key];
+                    return true;
+                }
+                return false;
+            };
+            class_1.prototype.clear = function () {
+                this.data = createDictionaryObject();
+                this.size = 0;
+            };
+            class_1.prototype.keys = function () {
+                return new MapIterator(this.data, function (_data, key) { return key; });
+            };
+            class_1.prototype.values = function () {
+                return new MapIterator(this.data, function (data, key) { return data[key]; });
+            };
+            class_1.prototype.entries = function () {
+                return new MapIterator(this.data, function (data, key) { return [key, data[key]]; });
+            };
+            class_1.prototype.forEach = function (action) {
+                for (var key in this.data) {
+                    action(this.data[key], key);
+                }
+            };
+            return class_1;
+        }());
+    }
+    function length(array) {
+        return array ? array.length : 0;
+    }
+    ts.length = length;
+    /**
+     * Iterates through 'array' by index and performs the callback on each element of array until the callback
+     * returns a truthy value, then returns that value.
+     * If no such value is found, the callback is applied to each element of array and undefined is returned.
+     */
+    function forEach(array, callback) {
+        if (array) {
+            for (var i = 0; i < array.length; i++) {
+                var result = callback(array[i], i);
+                if (result) {
+                    return result;
+                }
+            }
+        }
+        return undefined;
+    }
+    ts.forEach = forEach;
+    /** Like `forEach`, but suitable for use with numbers and strings (which may be falsy). */
+    function firstDefined(array, callback) {
+        if (array === undefined) {
+            return undefined;
+        }
+        for (var i = 0; i < array.length; i++) {
+            var result = callback(array[i], i);
+            if (result !== undefined) {
+                return result;
+            }
+        }
+        return undefined;
+    }
+    ts.firstDefined = firstDefined;
+    function firstDefinedIterator(iter, callback) {
+        while (true) {
+            var _a = iter.next(), value = _a.value, done = _a.done;
+            if (done) {
+                return undefined;
+            }
+            var result = callback(value);
+            if (result !== undefined) {
+                return result;
+            }
+        }
+    }
+    ts.firstDefinedIterator = firstDefinedIterator;
+    function zipWith(arrayA, arrayB, callback) {
+        var result = [];
+        Debug.assertEqual(arrayA.length, arrayB.length);
+        for (var i = 0; i < arrayA.length; i++) {
+            result.push(callback(arrayA[i], arrayB[i], i));
+        }
+        return result;
+    }
+    ts.zipWith = zipWith;
+    function zipToIterator(arrayA, arrayB) {
+        Debug.assertEqual(arrayA.length, arrayB.length);
+        var i = 0;
+        return {
+            next: function () {
+                if (i === arrayA.length) {
+                    return { value: undefined, done: true };
+                }
+                i++;
+                return { value: [arrayA[i - 1], arrayB[i - 1]], done: false };
+            }
+        };
+    }
+    ts.zipToIterator = zipToIterator;
+    function zipToMap(keys, values) {
+        Debug.assert(keys.length === values.length);
+        var map = createMap();
+        for (var i = 0; i < keys.length; ++i) {
+            map.set(keys[i], values[i]);
+        }
+        return map;
+    }
+    ts.zipToMap = zipToMap;
+    /**
+     * Iterates through `array` by index and performs the callback on each element of array until the callback
+     * returns a falsey value, then returns false.
+     * If no such value is found, the callback is applied to each element of array and `true` is returned.
+     */
+    function every(array, callback) {
+        if (array) {
+            for (var i = 0; i < array.length; i++) {
+                if (!callback(array[i], i)) {
+                    return false;
+                }
+            }
+        }
+        return true;
+    }
+    ts.every = every;
+    function find(array, predicate) {
+        for (var i = 0; i < array.length; i++) {
+            var value = array[i];
+            if (predicate(value, i)) {
+                return value;
+            }
+        }
+        return undefined;
+    }
+    ts.find = find;
+    function findLast(array, predicate) {
+        for (var i = array.length - 1; i >= 0; i--) {
+            var value = array[i];
+            if (predicate(value, i)) {
+                return value;
+            }
+        }
+        return undefined;
+    }
+    ts.findLast = findLast;
+    /** Works like Array.prototype.findIndex, returning `-1` if no element satisfying the predicate is found. */
+    function findIndex(array, predicate, startIndex) {
+        for (var i = startIndex || 0; i < array.length; i++) {
+            if (predicate(array[i], i)) {
+                return i;
+            }
+        }
+        return -1;
+    }
+    ts.findIndex = findIndex;
+    function findLastIndex(array, predicate, startIndex) {
+        for (var i = startIndex === undefined ? array.length - 1 : startIndex; i >= 0; i--) {
+            if (predicate(array[i], i)) {
+                return i;
+            }
+        }
+        return -1;
+    }
+    ts.findLastIndex = findLastIndex;
+    /**
+     * Returns the first truthy result of `callback`, or else fails.
+     * This is like `forEach`, but never returns undefined.
+     */
+    function findMap(array, callback) {
+        for (var i = 0; i < array.length; i++) {
+            var result = callback(array[i], i);
+            if (result) {
+                return result;
+            }
+        }
+        return Debug.fail();
+    }
+    ts.findMap = findMap;
+    function contains(array, value, equalityComparer) {
+        if (equalityComparer === void 0) { equalityComparer = equateValues; }
+        if (array) {
+            for (var _i = 0, array_1 = array; _i < array_1.length; _i++) {
+                var v = array_1[_i];
+                if (equalityComparer(v, value)) {
+                    return true;
+                }
+            }
+        }
+        return false;
+    }
+    ts.contains = contains;
+    function arraysEqual(a, b, equalityComparer) {
+        if (equalityComparer === void 0) { equalityComparer = equateValues; }
+        return a.length === b.length && a.every(function (x, i) { return equalityComparer(x, b[i]); });
+    }
+    ts.arraysEqual = arraysEqual;
+    function indexOfAnyCharCode(text, charCodes, start) {
+        for (var i = start || 0; i < text.length; i++) {
+            if (contains(charCodes, text.charCodeAt(i))) {
+                return i;
+            }
+        }
+        return -1;
+    }
+    ts.indexOfAnyCharCode = indexOfAnyCharCode;
+    function countWhere(array, predicate) {
+        var count = 0;
+        if (array) {
+            for (var i = 0; i < array.length; i++) {
+                var v = array[i];
+                if (predicate(v, i)) {
+                    count++;
+                }
+            }
+        }
+        return count;
+    }
+    ts.countWhere = countWhere;
+    function filter(array, f) {
+        if (array) {
+            var len = array.length;
+            var i = 0;
+            while (i < len && f(array[i]))
+                i++;
+            if (i < len) {
+                var result = array.slice(0, i);
+                i++;
+                while (i < len) {
+                    var item = array[i];
+                    if (f(item)) {
+                        result.push(item);
+                    }
+                    i++;
+                }
+                return result;
+            }
+        }
+        return array;
+    }
+    ts.filter = filter;
+    function filterMutate(array, f) {
+        var outIndex = 0;
+        for (var i = 0; i < array.length; i++) {
+            if (f(array[i], i, array)) {
+                array[outIndex] = array[i];
+                outIndex++;
+            }
+        }
+        array.length = outIndex;
+    }
+    ts.filterMutate = filterMutate;
+    function clear(array) {
+        array.length = 0;
+    }
+    ts.clear = clear;
+    function map(array, f) {
+        var result;
+        if (array) {
+            result = [];
+            for (var i = 0; i < array.length; i++) {
+                result.push(f(array[i], i));
+            }
+        }
+        return result;
+    }
+    ts.map = map;
+    function mapIterator(iter, mapFn) {
+        return {
+            next: function () {
+                var iterRes = iter.next();
+                return iterRes.done ? iterRes : { value: mapFn(iterRes.value), done: false };
+            }
+        };
+    }
+    ts.mapIterator = mapIterator;
+    function sameMap(array, f) {
+        if (array) {
+            for (var i = 0; i < array.length; i++) {
+                var item = array[i];
+                var mapped = f(item, i);
+                if (item !== mapped) {
+                    var result = array.slice(0, i);
+                    result.push(mapped);
+                    for (i++; i < array.length; i++) {
+                        result.push(f(array[i], i));
+                    }
+                    return result;
+                }
+            }
+        }
+        return array;
+    }
+    ts.sameMap = sameMap;
+    function flatten(array) {
+        var result;
+        if (array) {
+            result = [];
+            for (var _i = 0, array_2 = array; _i < array_2.length; _i++) {
+                var v = array_2[_i];
+                if (v) {
+                    if (isArray(v)) {
+                        addRange(result, v);
+                    }
+                    else {
+                        result.push(v);
+                    }
+                }
+            }
+        }
+        return result;
+    }
+    ts.flatten = flatten;
+    function flatMap(array, mapfn) {
+        var result;
+        if (array) {
+            result = [];
+            for (var i = 0; i < array.length; i++) {
+                var v = mapfn(array[i], i);
+                if (v) {
+                    if (isArray(v)) {
+                        addRange(result, v);
+                    }
+                    else {
+                        result.push(v);
+                    }
+                }
+            }
+        }
+        return result;
+    }
+    ts.flatMap = flatMap;
+    function flatMapIterator(iter, mapfn) {
+        var first = iter.next();
+        if (first.done) {
+            return ts.emptyIterator;
+        }
+        var currentIter = getIterator(first.value);
+        return {
+            next: function () {
+                while (true) {
+                    var currentRes = currentIter.next();
+                    if (!currentRes.done) {
+                        return currentRes;
+                    }
+                    var iterRes = iter.next();
+                    if (iterRes.done) {
+                        return iterRes;
+                    }
+                    currentIter = getIterator(iterRes.value);
+                }
+            },
+        };
+        function getIterator(x) {
+            var res = mapfn(x);
+            return res === undefined ? ts.emptyIterator : isArray(res) ? arrayIterator(res) : res;
+        }
+    }
+    ts.flatMapIterator = flatMapIterator;
+    function sameFlatMap(array, mapfn) {
+        var result;
+        if (array) {
+            for (var i = 0; i < array.length; i++) {
+                var item = array[i];
+                var mapped = mapfn(item, i);
+                if (result || item !== mapped || isArray(mapped)) {
+                    if (!result) {
+                        result = array.slice(0, i);
+                    }
+                    if (isArray(mapped)) {
+                        addRange(result, mapped);
+                    }
+                    else {
+                        result.push(mapped);
+                    }
+                }
+            }
+        }
+        return result || array;
+    }
+    ts.sameFlatMap = sameFlatMap;
+    function mapAllOrFail(array, mapFn) {
+        var result = [];
+        for (var i = 0; i < array.length; i++) {
+            var mapped = mapFn(array[i], i);
+            if (mapped === undefined) {
+                return undefined;
+            }
+            result.push(mapped);
+        }
+        return result;
+    }
+    ts.mapAllOrFail = mapAllOrFail;
+    function mapDefined(array, mapFn) {
+        var result = [];
+        if (array) {
+            for (var i = 0; i < array.length; i++) {
+                var mapped = mapFn(array[i], i);
+                if (mapped !== undefined) {
+                    result.push(mapped);
+                }
+            }
+        }
+        return result;
+    }
+    ts.mapDefined = mapDefined;
+    function mapDefinedIterator(iter, mapFn) {
+        return {
+            next: function () {
+                while (true) {
+                    var res = iter.next();
+                    if (res.done) {
+                        return res;
+                    }
+                    var value = mapFn(res.value);
+                    if (value !== undefined) {
+                        return { value: value, done: false };
+                    }
+                }
+            }
+        };
+    }
+    ts.mapDefinedIterator = mapDefinedIterator;
+    ts.emptyIterator = { next: function () { return ({ value: undefined, done: true }); } };
+    function singleIterator(value) {
+        var done = false;
+        return {
+            next: function () {
+                var wasDone = done;
+                done = true;
+                return wasDone ? { value: undefined, done: true } : { value: value, done: false };
+            }
+        };
+    }
+    ts.singleIterator = singleIterator;
+    function spanMap(array, keyfn, mapfn) {
+        var result;
+        if (array) {
+            result = [];
+            var len = array.length;
+            var previousKey = void 0;
+            var key = void 0;
+            var start = 0;
+            var pos = 0;
+            while (start < len) {
+                while (pos < len) {
+                    var value = array[pos];
+                    key = keyfn(value, pos);
+                    if (pos === 0) {
+                        previousKey = key;
+                    }
+                    else if (key !== previousKey) {
+                        break;
+                    }
+                    pos++;
+                }
+                if (start < pos) {
+                    var v = mapfn(array.slice(start, pos), previousKey, start, pos);
+                    if (v) {
+                        result.push(v);
+                    }
+                    start = pos;
+                }
+                previousKey = key;
+                pos++;
+            }
+        }
+        return result;
+    }
+    ts.spanMap = spanMap;
+    function mapEntries(map, f) {
+        if (!map) {
+            return undefined;
+        }
+        var result = createMap();
+        map.forEach(function (value, key) {
+            var _a = f(key, value), newKey = _a[0], newValue = _a[1];
+            result.set(newKey, newValue);
+        });
+        return result;
+    }
+    ts.mapEntries = mapEntries;
+    function some(array, predicate) {
+        if (array) {
+            if (predicate) {
+                for (var _i = 0, array_3 = array; _i < array_3.length; _i++) {
+                    var v = array_3[_i];
+                    if (predicate(v)) {
+                        return true;
+                    }
+                }
+            }
+            else {
+                return array.length > 0;
+            }
+        }
+        return false;
+    }
+    ts.some = some;
+    /** Calls the callback with (start, afterEnd) index pairs for each range where 'pred' is true. */
+    function getRangesWhere(arr, pred, cb) {
+        var start;
+        for (var i = 0; i < arr.length; i++) {
+            if (pred(arr[i])) {
+                start = start === undefined ? i : start;
+            }
+            else {
+                if (start !== undefined) {
+                    cb(start, i);
+                    start = undefined;
+                }
+            }
+        }
+        if (start !== undefined)
+            cb(start, arr.length);
+    }
+    ts.getRangesWhere = getRangesWhere;
+    function concatenate(array1, array2) {
+        if (!some(array2))
+            return array1;
+        if (!some(array1))
+            return array2;
+        return array1.concat(array2);
+    }
+    ts.concatenate = concatenate;
+    function deduplicateRelational(array, equalityComparer, comparer) {
+        // Perform a stable sort of the array. This ensures the first entry in a list of
+        // duplicates remains the first entry in the result.
+        var indices = array.map(function (_, i) { return i; });
+        stableSortIndices(array, indices, comparer);
+        var last = array[indices[0]];
+        var deduplicated = [indices[0]];
+        for (var i = 1; i < indices.length; i++) {
+            var index = indices[i];
+            var item = array[index];
+            if (!equalityComparer(last, item)) {
+                deduplicated.push(index);
+                last = item;
+            }
+        }
+        // restore original order
+        deduplicated.sort();
+        return deduplicated.map(function (i) { return array[i]; });
+    }
+    function deduplicateEquality(array, equalityComparer) {
+        var result = [];
+        for (var _i = 0, array_4 = array; _i < array_4.length; _i++) {
+            var item = array_4[_i];
+            pushIfUnique(result, item, equalityComparer);
+        }
+        return result;
+    }
+    function deduplicate(array, equalityComparer, comparer) {
+        return !array ? undefined :
+            array.length === 0 ? [] :
+                array.length === 1 ? array.slice() :
+                    comparer ? deduplicateRelational(array, equalityComparer, comparer) :
+                        deduplicateEquality(array, equalityComparer);
+    }
+    ts.deduplicate = deduplicate;
+    function deduplicateSorted(array, comparer) {
+        if (!array)
+            return undefined;
+        if (array.length === 0)
+            return [];
+        var last = array[0];
+        var deduplicated = [last];
+        for (var i = 1; i < array.length; i++) {
+            var next = array[i];
+            switch (comparer(next, last)) {
+                // equality comparison
+                case true:
+                // relational comparison
+                case 0 /* EqualTo */:
+                    continue;
+                case -1 /* LessThan */:
+                    // If `array` is sorted, `next` should **never** be less than `last`.
+                    return Debug.fail("Array is unsorted.");
+            }
+            deduplicated.push(last = next);
+        }
+        return deduplicated;
+    }
+    function insertSorted(array, insert, compare) {
+        if (array.length === 0) {
+            array.push(insert);
+            return;
+        }
+        var insertIndex = binarySearch(array, insert, identity, compare);
+        if (insertIndex < 0) {
+            array.splice(~insertIndex, 0, insert);
+        }
+    }
+    ts.insertSorted = insertSorted;
+    function sortAndDeduplicate(array, comparer, equalityComparer) {
+        return deduplicateSorted(sort(array, comparer), equalityComparer || comparer);
+    }
+    ts.sortAndDeduplicate = sortAndDeduplicate;
+    function arrayIsEqualTo(array1, array2, equalityComparer) {
+        if (equalityComparer === void 0) { equalityComparer = equateValues; }
+        if (!array1 || !array2) {
+            return array1 === array2;
+        }
+        if (array1.length !== array2.length) {
+            return false;
+        }
+        for (var i = 0; i < array1.length; i++) {
+            if (!equalityComparer(array1[i], array2[i])) {
+                return false;
+            }
+        }
+        return true;
+    }
+    ts.arrayIsEqualTo = arrayIsEqualTo;
+    function compact(array) {
+        var result;
+        if (array) {
+            for (var i = 0; i < array.length; i++) {
+                var v = array[i];
+                if (result || !v) {
+                    if (!result) {
+                        result = array.slice(0, i);
+                    }
+                    if (v) {
+                        result.push(v);
+                    }
+                }
+            }
+        }
+        return result || array;
+    }
+    ts.compact = compact;
+    /**
+     * Gets the relative complement of `arrayA` with respect to `arrayB`, returning the elements that
+     * are not present in `arrayA` but are present in `arrayB`. Assumes both arrays are sorted
+     * based on the provided comparer.
+     */
+    function relativeComplement(arrayA, arrayB, comparer) {
+        if (!arrayB || !arrayA || arrayB.length === 0 || arrayA.length === 0)
+            return arrayB;
+        var result = [];
+        loopB: for (var offsetA = 0, offsetB = 0; offsetB < arrayB.length; offsetB++) {
+            if (offsetB > 0) {
+                // Ensure `arrayB` is properly sorted.
+                Debug.assertGreaterThanOrEqual(comparer(arrayB[offsetB], arrayB[offsetB - 1]), 0 /* EqualTo */);
+            }
+            loopA: for (var startA = offsetA; offsetA < arrayA.length; offsetA++) {
+                if (offsetA > startA) {
+                    // Ensure `arrayA` is properly sorted. We only need to perform this check if
+                    // `offsetA` has changed since we entered the loop.
+                    Debug.assertGreaterThanOrEqual(comparer(arrayA[offsetA], arrayA[offsetA - 1]), 0 /* EqualTo */);
+                }
+                switch (comparer(arrayB[offsetB], arrayA[offsetA])) {
+                    case -1 /* LessThan */:
+                        // If B is less than A, B does not exist in arrayA. Add B to the result and
+                        // move to the next element in arrayB without changing the current position
+                        // in arrayA.
+                        result.push(arrayB[offsetB]);
+                        continue loopB;
+                    case 0 /* EqualTo */:
+                        // If B is equal to A, B exists in arrayA. Move to the next element in
+                        // arrayB without adding B to the result or changing the current position
+                        // in arrayA.
+                        continue loopB;
+                    case 1 /* GreaterThan */:
+                        // If B is greater than A, we need to keep looking for B in arrayA. Move to
+                        // the next element in arrayA and recheck.
+                        continue loopA;
+                }
+            }
+        }
+        return result;
+    }
+    ts.relativeComplement = relativeComplement;
+    function sum(array, prop) {
+        var result = 0;
+        for (var _i = 0, array_5 = array; _i < array_5.length; _i++) {
+            var v = array_5[_i];
+            result += v[prop];
+        }
+        return result;
+    }
+    ts.sum = sum;
+    function append(to, value) {
+        if (value === undefined)
+            return to;
+        if (to === undefined)
+            return [value];
+        to.push(value);
+        return to;
+    }
+    ts.append = append;
+    /**
+     * Gets the actual offset into an array for a relative offset. Negative offsets indicate a
+     * position offset from the end of the array.
+     */
+    function toOffset(array, offset) {
+        return offset < 0 ? array.length + offset : offset;
+    }
+    function addRange(to, from, start, end) {
+        if (from === undefined || from.length === 0)
+            return to;
+        if (to === undefined)
+            return from.slice(start, end);
+        start = start === undefined ? 0 : toOffset(from, start);
+        end = end === undefined ? from.length : toOffset(from, end);
+        for (var i = start; i < end && i < from.length; i++) {
+            if (from[i] !== undefined) {
+                to.push(from[i]);
+            }
+        }
+        return to;
+    }
+    ts.addRange = addRange;
+    /**
+     * @return Whether the value was added.
+     */
+    function pushIfUnique(array, toAdd, equalityComparer) {
+        if (contains(array, toAdd, equalityComparer)) {
+            return false;
+        }
+        else {
+            array.push(toAdd);
+            return true;
+        }
+    }
+    ts.pushIfUnique = pushIfUnique;
+    /**
+     * Unlike `pushIfUnique`, this can take `undefined` as an input, and returns a new array.
+     */
+    function appendIfUnique(array, toAdd, equalityComparer) {
+        if (array) {
+            pushIfUnique(array, toAdd, equalityComparer);
+            return array;
+        }
+        else {
+            return [toAdd];
+        }
+    }
+    ts.appendIfUnique = appendIfUnique;
+    function stableSortIndices(array, indices, comparer) {
+        // sort indices by value then position
+        indices.sort(function (x, y) { return comparer(array[x], array[y]) || compareValues(x, y); });
+    }
+    /**
+     * Returns a new sorted array.
+     */
+    function sort(array, comparer) {
+        return array.slice().sort(comparer);
+    }
+    ts.sort = sort;
+    function best(iter, isBetter) {
+        var x = iter.next();
+        if (x.done) {
+            return undefined;
+        }
+        var best = x.value;
+        while (true) {
+            var _a = iter.next(), value = _a.value, done = _a.done;
+            if (done) {
+                return best;
+            }
+            if (isBetter(value, best)) {
+                best = value;
+            }
+        }
+    }
+    ts.best = best;
+    function arrayIterator(array) {
+        var i = 0;
+        return { next: function () {
+                if (i === array.length) {
+                    return { value: undefined, done: true };
+                }
+                else {
+                    i++;
+                    return { value: array[i - 1], done: false };
+                }
+            } };
+    }
+    ts.arrayIterator = arrayIterator;
+    /**
+     * Stable sort of an array. Elements equal to each other maintain their relative position in the array.
+     */
+    function stableSort(array, comparer) {
+        var indices = array.map(function (_, i) { return i; });
+        stableSortIndices(array, indices, comparer);
+        return indices.map(function (i) { return array[i]; });
+    }
+    ts.stableSort = stableSort;
+    function rangeEquals(array1, array2, pos, end) {
+        while (pos < end) {
+            if (array1[pos] !== array2[pos]) {
+                return false;
+            }
+            pos++;
+        }
+        return true;
+    }
+    ts.rangeEquals = rangeEquals;
+    /**
+     * Returns the element at a specific offset in an array if non-empty, `undefined` otherwise.
+     * A negative offset indicates the element should be retrieved from the end of the array.
+     */
+    function elementAt(array, offset) {
+        if (array) {
+            offset = toOffset(array, offset);
+            if (offset < array.length) {
+                return array[offset];
+            }
+        }
+        return undefined;
+    }
+    ts.elementAt = elementAt;
+    /**
+     * Returns the first element of an array if non-empty, `undefined` otherwise.
+     */
+    function firstOrUndefined(array) {
+        return array.length === 0 ? undefined : array[0];
+    }
+    ts.firstOrUndefined = firstOrUndefined;
+    function first(array) {
+        Debug.assert(array.length !== 0);
+        return array[0];
+    }
+    ts.first = first;
+    /**
+     * Returns the last element of an array if non-empty, `undefined` otherwise.
+     */
+    function lastOrUndefined(array) {
+        return array.length === 0 ? undefined : array[array.length - 1];
+    }
+    ts.lastOrUndefined = lastOrUndefined;
+    function last(array) {
+        Debug.assert(array.length !== 0);
+        return array[array.length - 1];
+    }
+    ts.last = last;
+    /**
+     * Returns the only element of an array if it contains only one element, `undefined` otherwise.
+     */
+    function singleOrUndefined(array) {
+        return array && array.length === 1
+            ? array[0]
+            : undefined;
+    }
+    ts.singleOrUndefined = singleOrUndefined;
+    function singleOrMany(array) {
+        return array && array.length === 1
+            ? array[0]
+            : array;
+    }
+    ts.singleOrMany = singleOrMany;
+    function replaceElement(array, index, value) {
+        var result = array.slice(0);
+        result[index] = value;
+        return result;
+    }
+    ts.replaceElement = replaceElement;
+    /**
+     * Performs a binary search, finding the index at which `value` occurs in `array`.
+     * If no such index is found, returns the 2's-complement of first index at which
+     * `array[index]` exceeds `value`.
+     * @param array A sorted array whose first element must be no larger than number
+     * @param value The value to be searched for in the array.
+     * @param keySelector A callback used to select the search key from `value` and each element of
+     * `array`.
+     * @param keyComparer A callback used to compare two keys in a sorted array.
+     * @param offset An offset into `array` at which to start the search.
+     */
+    function binarySearch(array, value, keySelector, keyComparer, offset) {
+        if (!array || array.length === 0) {
+            return -1;
+        }
+        var low = offset || 0;
+        var high = array.length - 1;
+        var key = keySelector(value);
+        while (low <= high) {
+            var middle = low + ((high - low) >> 1);
+            var midKey = keySelector(array[middle]);
+            switch (keyComparer(midKey, key)) {
+                case -1 /* LessThan */:
+                    low = middle + 1;
+                    break;
+                case 0 /* EqualTo */:
+                    return middle;
+                case 1 /* GreaterThan */:
+                    high = middle - 1;
+                    break;
+            }
+        }
+        return ~low;
+    }
+    ts.binarySearch = binarySearch;
+    function reduceLeft(array, f, initial, start, count) {
+        if (array && array.length > 0) {
+            var size = array.length;
+            if (size > 0) {
+                var pos = start === undefined || start < 0 ? 0 : start;
+                var end = count === undefined || pos + count > size - 1 ? size - 1 : pos + count;
+                var result = void 0;
+                if (arguments.length <= 2) {
+                    result = array[pos];
+                    pos++;
+                }
+                else {
+                    result = initial;
+                }
+                while (pos <= end) {
+                    result = f(result, array[pos], pos);
+                    pos++;
+                }
+                return result;
+            }
+        }
+        return initial;
+    }
+    ts.reduceLeft = reduceLeft;
+    var hasOwnProperty = Object.prototype.hasOwnProperty;
+    /**
+     * Indicates whether a map-like contains an own property with the specified key.
+     *
+     * @param map A map-like.
+     * @param key A property key.
+     */
+    function hasProperty(map, key) {
+        return hasOwnProperty.call(map, key);
+    }
+    ts.hasProperty = hasProperty;
+    /**
+     * Gets the value of an owned property in a map-like.
+     *
+     * @param map A map-like.
+     * @param key A property key.
+     */
+    function getProperty(map, key) {
+        return hasOwnProperty.call(map, key) ? map[key] : undefined;
+    }
+    ts.getProperty = getProperty;
+    /**
+     * Gets the owned, enumerable property keys of a map-like.
+     */
+    function getOwnKeys(map) {
+        var keys = [];
+        for (var key in map) {
+            if (hasOwnProperty.call(map, key)) {
+                keys.push(key);
+            }
+        }
+        return keys;
+    }
+    ts.getOwnKeys = getOwnKeys;
+    function getOwnValues(sparseArray) {
+        var values = [];
+        for (var key in sparseArray) {
+            if (hasOwnProperty.call(sparseArray, key)) {
+                values.push(sparseArray[key]);
+            }
+        }
+        return values;
+    }
+    ts.getOwnValues = getOwnValues;
+    function arrayFrom(iterator, map) {
+        var _a;
+        var result = [];
+        for (var _b = iterator.next(), value = _b.value, done = _b.done; !done; _a = iterator.next(), value = _a.value, done = _a.done, _a) {
+            result.push(map ? map(value) : value);
+        }
+        return result;
+    }
+    ts.arrayFrom = arrayFrom;
+    function assign(t) {
+        var args = [];
+        for (var _i = 1; _i < arguments.length; _i++) {
+            args[_i - 1] = arguments[_i];
+        }
+        for (var _a = 0, args_1 = args; _a < args_1.length; _a++) {
+            var arg = args_1[_a];
+            for (var p in arg) {
+                if (hasProperty(arg, p)) {
+                    t[p] = arg[p]; // TODO: GH#23368
+                }
+            }
+        }
+        return t;
+    }
+    ts.assign = assign;
+    /**
+     * Performs a shallow equality comparison of the contents of two map-likes.
+     *
+     * @param left A map-like whose properties should be compared.
+     * @param right A map-like whose properties should be compared.
+     */
+    function equalOwnProperties(left, right, equalityComparer) {
+        if (equalityComparer === void 0) { equalityComparer = equateValues; }
+        if (left === right)
+            return true;
+        if (!left || !right)
+            return false;
+        for (var key in left) {
+            if (hasOwnProperty.call(left, key)) {
+                if (!hasOwnProperty.call(right, key) === undefined)
+                    return false;
+                if (!equalityComparer(left[key], right[key]))
+                    return false;
+            }
+        }
+        for (var key in right) {
+            if (hasOwnProperty.call(right, key)) {
+                if (!hasOwnProperty.call(left, key))
+                    return false;
+            }
+        }
+        return true;
+    }
+    ts.equalOwnProperties = equalOwnProperties;
+    function arrayToMap(array, makeKey, makeValue) {
+        if (makeValue === void 0) { makeValue = identity; }
+        var result = createMap();
+        for (var _i = 0, array_6 = array; _i < array_6.length; _i++) {
+            var value = array_6[_i];
+            var key = makeKey(value);
+            if (key !== undefined)
+                result.set(key, makeValue(value));
+        }
+        return result;
+    }
+    ts.arrayToMap = arrayToMap;
+    function arrayToNumericMap(array, makeKey, makeValue) {
+        if (makeValue === void 0) { makeValue = identity; }
+        var result = [];
+        for (var _i = 0, array_7 = array; _i < array_7.length; _i++) {
+            var value = array_7[_i];
+            result[makeKey(value)] = makeValue(value);
+        }
+        return result;
+    }
+    ts.arrayToNumericMap = arrayToNumericMap;
+    function arrayToMultiMap(values, makeKey, makeValue) {
+        if (makeValue === void 0) { makeValue = identity; }
+        var result = createMultiMap();
+        for (var _i = 0, values_1 = values; _i < values_1.length; _i++) {
+            var value = values_1[_i];
+            result.add(makeKey(value), makeValue(value));
+        }
+        return result;
+    }
+    ts.arrayToMultiMap = arrayToMultiMap;
+    function group(values, getGroupId) {
+        return arrayFrom(arrayToMultiMap(values, getGroupId).values());
+    }
+    ts.group = group;
+    function clone(object) {
+        var result = {};
+        for (var id in object) {
+            if (hasOwnProperty.call(object, id)) {
+                result[id] = object[id];
+            }
+        }
+        return result;
+    }
+    ts.clone = clone;
+    function extend(first, second) {
+        var result = {};
+        for (var id in second) {
+            if (hasOwnProperty.call(second, id)) {
+                result[id] = second[id];
+            }
+        }
+        for (var id in first) {
+            if (hasOwnProperty.call(first, id)) {
+                result[id] = first[id];
+            }
+        }
+        return result;
+    }
+    ts.extend = extend;
+    function createMultiMap() {
+        var map = createMap();
+        map.add = multiMapAdd;
+        map.remove = multiMapRemove;
+        return map;
+    }
+    ts.createMultiMap = createMultiMap;
+    function multiMapAdd(key, value) {
+        var values = this.get(key);
+        if (values) {
+            values.push(value);
+        }
+        else {
+            this.set(key, values = [value]);
+        }
+        return values;
+    }
+    function multiMapRemove(key, value) {
+        var values = this.get(key);
+        if (values) {
+            unorderedRemoveItem(values, value);
+            if (!values.length) {
+                this.delete(key);
+            }
+        }
+    }
+    /**
+     * Tests whether a value is an array.
+     */
+    function isArray(value) {
+        return Array.isArray ? Array.isArray(value) : value instanceof Array;
+    }
+    ts.isArray = isArray;
+    function toArray(value) {
+        return isArray(value) ? value : [value];
+    }
+    ts.toArray = toArray;
+    /**
+     * Tests whether a value is string
+     */
+    function isString(text) {
+        return typeof text === "string";
+    }
+    ts.isString = isString;
+    function tryCast(value, test) {
+        return value !== undefined && test(value) ? value : undefined;
+    }
+    ts.tryCast = tryCast;
+    function cast(value, test) {
+        if (value !== undefined && test(value))
+            return value;
+        return Debug.fail("Invalid cast. The supplied value " + value + " did not pass the test '" + Debug.getFunctionName(test) + "'.");
+    }
+    ts.cast = cast;
+    /** Does nothing. */
+    function noop(_) { } // tslint:disable-line no-empty
+    ts.noop = noop;
+    /** Do nothing and return false */
+    function returnFalse() { return false; }
+    ts.returnFalse = returnFalse;
+    /** Do nothing and return true */
+    function returnTrue() { return true; }
+    ts.returnTrue = returnTrue;
+    /** Returns its argument. */
+    function identity(x) { return x; }
+    ts.identity = identity;
+    /** Returns lower case string */
+    function toLowerCase(x) { return x.toLowerCase(); }
+    ts.toLowerCase = toLowerCase;
+    /** Throws an error because a function is not implemented. */
+    function notImplemented() {
+        throw new Error("Not implemented");
+    }
+    ts.notImplemented = notImplemented;
+    function memoize(callback) {
+        var value;
+        return function () {
+            if (callback) {
+                value = callback();
+                callback = undefined;
+            }
+            return value;
+        };
+    }
+    ts.memoize = memoize;
+    function chain(a, b, c, d, e) {
+        if (e) {
+            var args_2 = [];
+            for (var i = 0; i < arguments.length; i++) {
+                args_2[i] = arguments[i];
+            }
+            return function (t) { return compose.apply(void 0, map(args_2, function (f) { return f(t); })); };
+        }
+        else if (d) {
+            return function (t) { return compose(a(t), b(t), c(t), d(t)); };
+        }
+        else if (c) {
+            return function (t) { return compose(a(t), b(t), c(t)); };
+        }
+        else if (b) {
+            return function (t) { return compose(a(t), b(t)); };
+        }
+        else if (a) {
+            return function (t) { return compose(a(t)); };
+        }
+        else {
+            return function (_) { return function (u) { return u; }; };
+        }
+    }
+    ts.chain = chain;
+    function compose(a, b, c, d, e) {
+        if (e) {
+            var args_3 = [];
+            for (var i = 0; i < arguments.length; i++) {
+                args_3[i] = arguments[i];
+            }
+            return function (t) { return reduceLeft(args_3, function (u, f) { return f(u); }, t); };
+        }
+        else if (d) {
+            return function (t) { return d(c(b(a(t)))); };
+        }
+        else if (c) {
+            return function (t) { return c(b(a(t))); };
+        }
+        else if (b) {
+            return function (t) { return b(a(t)); };
+        }
+        else if (a) {
+            return function (t) { return a(t); };
+        }
+        else {
+            return function (t) { return t; };
+        }
+    }
+    ts.compose = compose;
+    var AssertionLevel;
+    (function (AssertionLevel) {
+        AssertionLevel[AssertionLevel["None"] = 0] = "None";
+        AssertionLevel[AssertionLevel["Normal"] = 1] = "Normal";
+        AssertionLevel[AssertionLevel["Aggressive"] = 2] = "Aggressive";
+        AssertionLevel[AssertionLevel["VeryAggressive"] = 3] = "VeryAggressive";
+    })(AssertionLevel = ts.AssertionLevel || (ts.AssertionLevel = {}));
+    var Debug;
+    (function (Debug) {
+        Debug.currentAssertionLevel = 0 /* None */;
+        Debug.isDebugging = false;
+        function shouldAssert(level) {
+            return Debug.currentAssertionLevel >= level;
+        }
+        Debug.shouldAssert = shouldAssert;
+        function assert(expression, message, verboseDebugInfo, stackCrawlMark) {
+            if (!expression) {
+                if (verboseDebugInfo) {
+                    message += "\r\nVerbose Debug Information: " + (typeof verboseDebugInfo === "string" ? verboseDebugInfo : verboseDebugInfo());
+                }
+                fail(message ? "False expression: " + message : "False expression.", stackCrawlMark || assert);
+            }
+        }
+        Debug.assert = assert;
+        function assertEqual(a, b, msg, msg2) {
+            if (a !== b) {
+                var message = msg ? msg2 ? msg + " " + msg2 : msg : "";
+                fail("Expected " + a + " === " + b + ". " + message);
+            }
+        }
+        Debug.assertEqual = assertEqual;
+        function assertLessThan(a, b, msg) {
+            if (a >= b) {
+                fail("Expected " + a + " < " + b + ". " + (msg || ""));
+            }
+        }
+        Debug.assertLessThan = assertLessThan;
+        function assertLessThanOrEqual(a, b) {
+            if (a > b) {
+                fail("Expected " + a + " <= " + b);
+            }
+        }
+        Debug.assertLessThanOrEqual = assertLessThanOrEqual;
+        function assertGreaterThanOrEqual(a, b) {
+            if (a < b) {
+                fail("Expected " + a + " >= " + b);
+            }
+        }
+        Debug.assertGreaterThanOrEqual = assertGreaterThanOrEqual;
+        function fail(message, stackCrawlMark) {
+            debugger;
+            var e = new Error(message ? "Debug Failure. " + message : "Debug Failure.");
+            if (Error.captureStackTrace) {
+                Error.captureStackTrace(e, stackCrawlMark || fail);
+            }
+            throw e;
+        }
+        Debug.fail = fail;
+        function assertDefined(value, message) {
+            if (value === undefined || value === null)
+                return fail(message);
+            return value;
+        }
+        Debug.assertDefined = assertDefined;
+        function assertEachDefined(value, message) {
+            for (var _i = 0, value_1 = value; _i < value_1.length; _i++) {
+                var v = value_1[_i];
+                assertDefined(v, message);
+            }
+            return value;
+        }
+        Debug.assertEachDefined = assertEachDefined;
+        function assertNever(member, message, stackCrawlMark) {
+            return fail(message || "Illegal value: " + member, stackCrawlMark || assertNever);
+        }
+        Debug.assertNever = assertNever;
+        function getFunctionName(func) {
+            if (typeof func !== "function") {
+                return "";
+            }
+            else if (func.hasOwnProperty("name")) {
+                return func.name;
+            }
+            else {
+                var text = Function.prototype.toString.call(func);
+                var match = /^function\s+([\w\$]+)\s*\(/.exec(text);
+                return match ? match[1] : "";
+            }
+        }
+        Debug.getFunctionName = getFunctionName;
+    })(Debug = ts.Debug || (ts.Debug = {}));
+    function equateValues(a, b) {
+        return a === b;
+    }
+    ts.equateValues = equateValues;
+    /**
+     * Compare the equality of two strings using a case-sensitive ordinal comparison.
+     *
+     * Case-sensitive comparisons compare both strings one code-point at a time using the integer
+     * value of each code-point after applying `toUpperCase` to each string. We always map both
+     * strings to their upper-case form as some unicode characters do not properly round-trip to
+     * lowercase (such as `ẞ` (German sharp capital s)).
+     */
+    function equateStringsCaseInsensitive(a, b) {
+        return a === b
+            || a !== undefined
+                && b !== undefined
+                && a.toUpperCase() === b.toUpperCase();
+    }
+    ts.equateStringsCaseInsensitive = equateStringsCaseInsensitive;
+    /**
+     * Compare the equality of two strings using a case-sensitive ordinal comparison.
+     *
+     * Case-sensitive comparisons compare both strings one code-point at a time using the
+     * integer value of each code-point.
+     */
+    function equateStringsCaseSensitive(a, b) {
+        return equateValues(a, b);
+    }
+    ts.equateStringsCaseSensitive = equateStringsCaseSensitive;
+    function compareComparableValues(a, b) {
+        return a === b ? 0 /* EqualTo */ :
+            a === undefined ? -1 /* LessThan */ :
+                b === undefined ? 1 /* GreaterThan */ :
+                    a < b ? -1 /* LessThan */ :
+                        1 /* GreaterThan */;
+    }
+    /**
+     * Compare two numeric values for their order relative to each other.
+     * To compare strings, use any of the `compareStrings` functions.
+     */
+    function compareValues(a, b) {
+        return compareComparableValues(a, b);
+    }
+    ts.compareValues = compareValues;
+    function min(a, b, compare) {
+        return compare(a, b) === -1 /* LessThan */ ? a : b;
+    }
+    ts.min = min;
+    /**
+     * Compare two strings using a case-insensitive ordinal comparison.
+     *
+     * Ordinal comparisons are based on the difference between the unicode code points of both
+     * strings. Characters with multiple unicode representations are considered unequal. Ordinal
+     * comparisons provide predictable ordering, but place "a" after "B".
+     *
+     * Case-insensitive comparisons compare both strings one code-point at a time using the integer
+     * value of each code-point after applying `toUpperCase` to each string. We always map both
+     * strings to their upper-case form as some unicode characters do not properly round-trip to
+     * lowercase (such as `ẞ` (German sharp capital s)).
+     */
+    function compareStringsCaseInsensitive(a, b) {
+        if (a === b)
+            return 0 /* EqualTo */;
+        if (a === undefined)
+            return -1 /* LessThan */;
+        if (b === undefined)
+            return 1 /* GreaterThan */;
+        a = a.toUpperCase();
+        b = b.toUpperCase();
+        return a < b ? -1 /* LessThan */ : a > b ? 1 /* GreaterThan */ : 0 /* EqualTo */;
+    }
+    ts.compareStringsCaseInsensitive = compareStringsCaseInsensitive;
+    /**
+     * Compare two strings using a case-sensitive ordinal comparison.
+     *
+     * Ordinal comparisons are based on the difference between the unicode code points of both
+     * strings. Characters with multiple unicode representations are considered unequal. Ordinal
+     * comparisons provide predictable ordering, but place "a" after "B".
+     *
+     * Case-sensitive comparisons compare both strings one code-point at a time using the integer
+     * value of each code-point.
+     */
+    function compareStringsCaseSensitive(a, b) {
+        return compareComparableValues(a, b);
+    }
+    ts.compareStringsCaseSensitive = compareStringsCaseSensitive;
+    function getStringComparer(ignoreCase) {
+        return ignoreCase ? compareStringsCaseInsensitive : compareStringsCaseSensitive;
+    }
+    ts.getStringComparer = getStringComparer;
+    /**
+     * Creates a string comparer for use with string collation in the UI.
+     */
+    var createUIStringComparer = (function () {
+        var defaultComparer;
+        var enUSComparer;
+        var stringComparerFactory = getStringComparerFactory();
+        return createStringComparer;
+        function compareWithCallback(a, b, comparer) {
+            if (a === b)
+                return 0 /* EqualTo */;
+            if (a === undefined)
+                return -1 /* LessThan */;
+            if (b === undefined)
+                return 1 /* GreaterThan */;
+            var value = comparer(a, b);
+            return value < 0 ? -1 /* LessThan */ : value > 0 ? 1 /* GreaterThan */ : 0 /* EqualTo */;
+        }
+        function createIntlCollatorStringComparer(locale) {
+            // Intl.Collator.prototype.compare is bound to the collator. See NOTE in
+            // http://www.ecma-international.org/ecma-402/2.0/#sec-Intl.Collator.prototype.compare
+            var comparer = new Intl.Collator(locale, { usage: "sort", sensitivity: "variant" }).compare;
+            return function (a, b) { return compareWithCallback(a, b, comparer); };
+        }
+        function createLocaleCompareStringComparer(locale) {
+            // if the locale is not the default locale (`undefined`), use the fallback comparer.
+            if (locale !== undefined)
+                return createFallbackStringComparer();
+            return function (a, b) { return compareWithCallback(a, b, compareStrings); };
+            function compareStrings(a, b) {
+                return a.localeCompare(b);
+            }
+        }
+        function createFallbackStringComparer() {
+            // An ordinal comparison puts "A" after "b", but for the UI we want "A" before "b".
+            // We first sort case insensitively.  So "Aaa" will come before "baa".
+            // Then we sort case sensitively, so "aaa" will come before "Aaa".
+            //
+            // For case insensitive comparisons we always map both strings to their
+            // upper-case form as some unicode characters do not properly round-trip to
+            // lowercase (such as `ẞ` (German sharp capital s)).
+            return function (a, b) { return compareWithCallback(a, b, compareDictionaryOrder); };
+            function compareDictionaryOrder(a, b) {
+                return compareStrings(a.toUpperCase(), b.toUpperCase()) || compareStrings(a, b);
+            }
+            function compareStrings(a, b) {
+                return a < b ? -1 /* LessThan */ : a > b ? 1 /* GreaterThan */ : 0 /* EqualTo */;
+            }
+        }
+        function getStringComparerFactory() {
+            // If the host supports Intl, we use it for comparisons using the default locale.
+            if (typeof Intl === "object" && typeof Intl.Collator === "function") {
+                return createIntlCollatorStringComparer;
+            }
+            // If the host does not support Intl, we fall back to localeCompare.
+            // localeCompare in Node v0.10 is just an ordinal comparison, so don't use it.
+            if (typeof String.prototype.localeCompare === "function" &&
+                typeof String.prototype.toLocaleUpperCase === "function" &&
+                "a".localeCompare("B") < 0) {
+                return createLocaleCompareStringComparer;
+            }
+            // Otherwise, fall back to ordinal comparison:
+            return createFallbackStringComparer;
+        }
+        function createStringComparer(locale) {
+            // Hold onto common string comparers. This avoids constantly reallocating comparers during
+            // tests.
+            if (locale === undefined) {
+                return defaultComparer || (defaultComparer = stringComparerFactory(locale));
+            }
+            else if (locale === "en-US") {
+                return enUSComparer || (enUSComparer = stringComparerFactory(locale));
+            }
+            else {
+                return stringComparerFactory(locale);
+            }
+        }
+    })();
+    var uiComparerCaseSensitive;
+    var uiLocale;
+    function getUILocale() {
+        return uiLocale;
+    }
+    ts.getUILocale = getUILocale;
+    function setUILocale(value) {
+        if (uiLocale !== value) {
+            uiLocale = value;
+            uiComparerCaseSensitive = undefined;
+        }
+    }
+    ts.setUILocale = setUILocale;
+    /**
+     * Compare two strings in a using the case-sensitive sort behavior of the UI locale.
+     *
+     * Ordering is not predictable between different host locales, but is best for displaying
+     * ordered data for UI presentation. Characters with multiple unicode representations may
+     * be considered equal.
+     *
+     * Case-sensitive comparisons compare strings that differ in base characters, or
+     * accents/diacritic marks, or case as unequal.
+     */
+    function compareStringsCaseSensitiveUI(a, b) {
+        var comparer = uiComparerCaseSensitive || (uiComparerCaseSensitive = createUIStringComparer(uiLocale));
+        return comparer(a, b);
+    }
+    ts.compareStringsCaseSensitiveUI = compareStringsCaseSensitiveUI;
+    function compareProperties(a, b, key, comparer) {
+        return a === b ? 0 /* EqualTo */ :
+            a === undefined ? -1 /* LessThan */ :
+                b === undefined ? 1 /* GreaterThan */ :
+                    comparer(a[key], b[key]);
+    }
+    ts.compareProperties = compareProperties;
+    /** True is greater than false. */
+    function compareBooleans(a, b) {
+        return compareValues(a ? 1 : 0, b ? 1 : 0);
+    }
+    ts.compareBooleans = compareBooleans;
+    /**
+     * Given a name and a list of names that are *not* equal to the name, return a spelling suggestion if there is one that is close enough.
+     * Names less than length 3 only check for case-insensitive equality, not Levenshtein distance.
+     *
+     * If there is a candidate that's the same except for case, return that.
+     * If there is a candidate that's within one edit of the name, return that.
+     * Otherwise, return the candidate with the smallest Levenshtein distance,
+     *    except for candidates:
+     *      * With no name
+     *      * Whose length differs from the target name by more than 0.34 of the length of the name.
+     *      * Whose levenshtein distance is more than 0.4 of the length of the name
+     *        (0.4 allows 1 substitution/transposition for every 5 characters,
+     *         and 1 insertion/deletion at 3 characters)
+     */
+    function getSpellingSuggestion(name, candidates, getName) {
+        var maximumLengthDifference = Math.min(2, Math.floor(name.length * 0.34));
+        var bestDistance = Math.floor(name.length * 0.4) + 1; // If the best result isn't better than this, don't bother.
+        var bestCandidate;
+        var justCheckExactMatches = false;
+        var nameLowerCase = name.toLowerCase();
+        for (var _i = 0, candidates_1 = candidates; _i < candidates_1.length; _i++) {
+            var candidate = candidates_1[_i];
+            var candidateName = getName(candidate);
+            if (candidateName !== undefined && Math.abs(candidateName.length - nameLowerCase.length) <= maximumLengthDifference) {
+                var candidateNameLowerCase = candidateName.toLowerCase();
+                if (candidateNameLowerCase === nameLowerCase) {
+                    return candidate;
+                }
+                if (justCheckExactMatches) {
+                    continue;
+                }
+                if (candidateName.length < 3) {
+                    // Don't bother, user would have noticed a 2-character name having an extra character
+                    continue;
+                }
+                // Only care about a result better than the best so far.
+                var distance = levenshteinWithMax(nameLowerCase, candidateNameLowerCase, bestDistance - 1);
+                if (distance === undefined) {
+                    continue;
+                }
+                if (distance < 3) {
+                    justCheckExactMatches = true;
+                    bestCandidate = candidate;
+                }
+                else {
+                    Debug.assert(distance < bestDistance); // Else `levenshteinWithMax` should return undefined
+                    bestDistance = distance;
+                    bestCandidate = candidate;
+                }
+            }
+        }
+        return bestCandidate;
+    }
+    ts.getSpellingSuggestion = getSpellingSuggestion;
+    function levenshteinWithMax(s1, s2, max) {
+        var previous = new Array(s2.length + 1);
+        var current = new Array(s2.length + 1);
+        /** Represents any value > max. We don't care about the particular value. */
+        var big = max + 1;
+        for (var i = 0; i <= s2.length; i++) {
+            previous[i] = i;
+        }
+        for (var i = 1; i <= s1.length; i++) {
+            var c1 = s1.charCodeAt(i - 1);
+            var minJ = i > max ? i - max : 1;
+            var maxJ = s2.length > max + i ? max + i : s2.length;
+            current[0] = i;
+            /** Smallest value of the matrix in the ith column. */
+            var colMin = i;
+            for (var j = 1; j < minJ; j++) {
+                current[j] = big;
+            }
+            for (var j = minJ; j <= maxJ; j++) {
+                var dist = c1 === s2.charCodeAt(j - 1)
+                    ? previous[j - 1]
+                    : Math.min(/*delete*/ previous[j] + 1, /*insert*/ current[j - 1] + 1, /*substitute*/ previous[j - 1] + 2);
+                current[j] = dist;
+                colMin = Math.min(colMin, dist);
+            }
+            for (var j = maxJ + 1; j <= s2.length; j++) {
+                current[j] = big;
+            }
+            if (colMin > max) {
+                // Give up -- everything in this column is > max and it can't get better in future columns.
+                return undefined;
+            }
+            var temp = previous;
+            previous = current;
+            current = temp;
+        }
+        var res = previous[s2.length];
+        return res > max ? undefined : res;
+    }
+    function endsWith(str, suffix) {
+        var expectedPos = str.length - suffix.length;
+        return expectedPos >= 0 && str.indexOf(suffix, expectedPos) === expectedPos;
+    }
+    ts.endsWith = endsWith;
+    function removeSuffix(str, suffix) {
+        return endsWith(str, suffix) ? str.slice(0, str.length - suffix.length) : str;
+    }
+    ts.removeSuffix = removeSuffix;
+    function tryRemoveSuffix(str, suffix) {
+        return endsWith(str, suffix) ? str.slice(0, str.length - suffix.length) : undefined;
+    }
+    ts.tryRemoveSuffix = tryRemoveSuffix;
+    function stringContains(str, substring) {
+        return str.indexOf(substring) !== -1;
+    }
+    ts.stringContains = stringContains;
+    function fileExtensionIs(path, extension) {
+        return path.length > extension.length && endsWith(path, extension);
+    }
+    ts.fileExtensionIs = fileExtensionIs;
+    function fileExtensionIsOneOf(path, extensions) {
+        for (var _i = 0, extensions_1 = extensions; _i < extensions_1.length; _i++) {
+            var extension = extensions_1[_i];
+            if (fileExtensionIs(path, extension)) {
+                return true;
+            }
+        }
+        return false;
+    }
+    ts.fileExtensionIsOneOf = fileExtensionIsOneOf;
+    /**
+     * Takes a string like "jquery-min.4.2.3" and returns "jquery"
+     */
+    function removeMinAndVersionNumbers(fileName) {
+        // Match a "." or "-" followed by a version number or 'min' at the end of the name
+        var trailingMinOrVersion = /[.-]((min)|(\d+(\.\d+)*))$/;
+        // The "min" or version may both be present, in either order, so try applying the above twice.
+        return fileName.replace(trailingMinOrVersion, "").replace(trailingMinOrVersion, "");
+    }
+    ts.removeMinAndVersionNumbers = removeMinAndVersionNumbers;
+    /** Remove an item from an array, moving everything to its right one space left. */
+    function orderedRemoveItem(array, item) {
+        for (var i = 0; i < array.length; i++) {
+            if (array[i] === item) {
+                orderedRemoveItemAt(array, i);
+                return true;
+            }
+        }
+        return false;
+    }
+    ts.orderedRemoveItem = orderedRemoveItem;
+    /** Remove an item by index from an array, moving everything to its right one space left. */
+    function orderedRemoveItemAt(array, index) {
+        // This seems to be faster than either `array.splice(i, 1)` or `array.copyWithin(i, i+ 1)`.
+        for (var i = index; i < array.length - 1; i++) {
+            array[i] = array[i + 1];
+        }
+        array.pop();
+    }
+    ts.orderedRemoveItemAt = orderedRemoveItemAt;
+    function unorderedRemoveItemAt(array, index) {
+        // Fill in the "hole" left at `index`.
+        array[index] = array[array.length - 1];
+        array.pop();
+    }
+    ts.unorderedRemoveItemAt = unorderedRemoveItemAt;
+    /** Remove the *first* occurrence of `item` from the array. */
+    function unorderedRemoveItem(array, item) {
+        return unorderedRemoveFirstItemWhere(array, function (element) { return element === item; });
+    }
+    ts.unorderedRemoveItem = unorderedRemoveItem;
+    /** Remove the *first* element satisfying `predicate`. */
+    function unorderedRemoveFirstItemWhere(array, predicate) {
+        for (var i = 0; i < array.length; i++) {
+            if (predicate(array[i])) {
+                unorderedRemoveItemAt(array, i);
+                return true;
+            }
+        }
+        return false;
+    }
+    function createGetCanonicalFileName(useCaseSensitiveFileNames) {
+        return useCaseSensitiveFileNames ? identity : toLowerCase;
+    }
+    ts.createGetCanonicalFileName = createGetCanonicalFileName;
+    function patternText(_a) {
+        var prefix = _a.prefix, suffix = _a.suffix;
+        return prefix + "*" + suffix;
+    }
+    ts.patternText = patternText;
+    /**
+     * Given that candidate matches pattern, returns the text matching the '*'.
+     * E.g.: matchedText(tryParsePattern("foo*baz"), "foobarbaz") === "bar"
+     */
+    function matchedText(pattern, candidate) {
+        Debug.assert(isPatternMatch(pattern, candidate));
+        return candidate.substring(pattern.prefix.length, candidate.length - pattern.suffix.length);
+    }
+    ts.matchedText = matchedText;
+    /** Return the object corresponding to the best pattern to match `candidate`. */
+    function findBestPatternMatch(values, getPattern, candidate) {
+        var matchedValue;
+        // use length of prefix as betterness criteria
+        var longestMatchPrefixLength = -1;
+        for (var _i = 0, values_2 = values; _i < values_2.length; _i++) {
+            var v = values_2[_i];
+            var pattern = getPattern(v);
+            if (isPatternMatch(pattern, candidate) && pattern.prefix.length > longestMatchPrefixLength) {
+                longestMatchPrefixLength = pattern.prefix.length;
+                matchedValue = v;
+            }
+        }
+        return matchedValue;
+    }
+    ts.findBestPatternMatch = findBestPatternMatch;
+    function startsWith(str, prefix) {
+        return str.lastIndexOf(prefix, 0) === 0;
+    }
+    ts.startsWith = startsWith;
+    function removePrefix(str, prefix) {
+        return startsWith(str, prefix) ? str.substr(prefix.length) : str;
+    }
+    ts.removePrefix = removePrefix;
+    function tryRemovePrefix(str, prefix) {
+        return startsWith(str, prefix) ? str.substring(prefix.length) : undefined;
+    }
+    ts.tryRemovePrefix = tryRemovePrefix;
+    function isPatternMatch(_a, candidate) {
+        var prefix = _a.prefix, suffix = _a.suffix;
+        return candidate.length >= prefix.length + suffix.length &&
+            startsWith(candidate, prefix) &&
+            endsWith(candidate, suffix);
+    }
+    function and(f, g) {
+        return function (arg) { return f(arg) && g(arg); };
+    }
+    ts.and = and;
+    function or(f, g) {
+        return function (arg) { return f(arg) || g(arg); };
+    }
+    ts.or = or;
+    function assertTypeIsNever(_) { } // tslint:disable-line no-empty
+    ts.assertTypeIsNever = assertTypeIsNever;
+    function singleElementArray(t) {
+        return t === undefined ? undefined : [t];
+    }
+    ts.singleElementArray = singleElementArray;
+    function enumerateInsertsAndDeletes(newItems, oldItems, comparer, inserted, deleted, unchanged) {
+        unchanged = unchanged || noop;
+        var newIndex = 0;
+        var oldIndex = 0;
+        var newLen = newItems.length;
+        var oldLen = oldItems.length;
+        while (newIndex < newLen && oldIndex < oldLen) {
+            var newItem = newItems[newIndex];
+            var oldItem = oldItems[oldIndex];
+            var compareResult = comparer(newItem, oldItem);
+            if (compareResult === -1 /* LessThan */) {
+                inserted(newItem);
+                newIndex++;
+            }
+            else if (compareResult === 1 /* GreaterThan */) {
+                deleted(oldItem);
+                oldIndex++;
+            }
+            else {
+                unchanged(oldItem, newItem);
+                newIndex++;
+                oldIndex++;
+            }
+        }
+        while (newIndex < newLen) {
+            inserted(newItems[newIndex++]);
+        }
+        while (oldIndex < oldLen) {
+            deleted(oldItems[oldIndex++]);
+        }
+    }
+    ts.enumerateInsertsAndDeletes = enumerateInsertsAndDeletes;
+})(ts || (ts = {}));
+//# sourceMappingURL=core.js.map
 "use strict";
 var __assign = (this && this.__assign) || Object.assign || function(t) {
     for (var s, i = 1, n = arguments.length; i < n; i++) {
@@ -22,29 +1994,8 @@ var __assign = (this && this.__assign) || Object.assign || function(t) {
     }
     return t;
 };
-var __makeTemplateObject = (this && this.__makeTemplateObject) || function (cooked, raw) {
-    if (Object.defineProperty) { Object.defineProperty(cooked, "raw", { value: raw }); } else { cooked.raw = raw; }
-    return cooked;
-};
-var __extends = (this && this.__extends) || (function () {
-    var extendStatics = Object.setPrototypeOf ||
-        ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
-        function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
-    return function (d, b) {
-        extendStatics(d, b);
-        function __() { this.constructor = d; }
-        d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
-    };
-})();
 var ts;
 (function (ts) {
-    /* @internal */
-    var Comparison;
-    (function (Comparison) {
-        Comparison[Comparison["LessThan"] = -1] = "LessThan";
-        Comparison[Comparison["EqualTo"] = 0] = "EqualTo";
-        Comparison[Comparison["GreaterThan"] = 1] = "GreaterThan";
-    })(Comparison = ts.Comparison || (ts.Comparison = {}));
     // token > SyntaxKind.Identifier => token is a keyword
     // Also, If you add a new SyntaxKind be sure to keep the `Markers` section at the bottom in sync
     var SyntaxKind;
@@ -1517,6 +3468,7 @@ var ts;
         "reference": {
             args: [
                 { name: "types", optional: true, captureSpan: true },
+                { name: "lib", optional: true, captureSpan: true },
                 { name: "path", optional: true, captureSpan: true },
                 { name: "no-default-lib", optional: true }
             ],
@@ -1542,3216 +3494,6 @@ var ts;
         },
     });
 })(ts || (ts = {}));
-/*@internal*/
-var ts;
-(function (ts) {
-    /** Gets a timestamp with (at least) ms resolution */
-    ts.timestamp = typeof performance !== "undefined" && performance.now ? function () { return performance.now(); } : Date.now ? Date.now : function () { return +(new Date()); };
-})(ts || (ts = {}));
-/*@internal*/
-/** Performance measurements for the compiler. */
-(function (ts) {
-    var performance;
-    (function (performance) {
-        // NOTE: cannot use ts.noop as core.ts loads after this
-        var profilerEvent = typeof onProfilerEvent === "function" && onProfilerEvent.profiler === true ? onProfilerEvent : function () { };
-        var enabled = false;
-        var profilerStart = 0;
-        var counts;
-        var marks;
-        var measures;
-        /**
-         * Marks a performance event.
-         *
-         * @param markName The name of the mark.
-         */
-        function mark(markName) {
-            if (enabled) {
-                marks.set(markName, ts.timestamp());
-                counts.set(markName, (counts.get(markName) || 0) + 1);
-                profilerEvent(markName);
-            }
-        }
-        performance.mark = mark;
-        /**
-         * Adds a performance measurement with the specified name.
-         *
-         * @param measureName The name of the performance measurement.
-         * @param startMarkName The name of the starting mark. If not supplied, the point at which the
-         *      profiler was enabled is used.
-         * @param endMarkName The name of the ending mark. If not supplied, the current timestamp is
-         *      used.
-         */
-        function measure(measureName, startMarkName, endMarkName) {
-            if (enabled) {
-                var end = endMarkName && marks.get(endMarkName) || ts.timestamp();
-                var start = startMarkName && marks.get(startMarkName) || profilerStart;
-                measures.set(measureName, (measures.get(measureName) || 0) + (end - start));
-            }
-        }
-        performance.measure = measure;
-        /**
-         * Gets the number of times a marker was encountered.
-         *
-         * @param markName The name of the mark.
-         */
-        function getCount(markName) {
-            return counts && counts.get(markName) || 0;
-        }
-        performance.getCount = getCount;
-        /**
-         * Gets the total duration of all measurements with the supplied name.
-         *
-         * @param measureName The name of the measure whose durations should be accumulated.
-         */
-        function getDuration(measureName) {
-            return measures && measures.get(measureName) || 0;
-        }
-        performance.getDuration = getDuration;
-        /**
-         * Iterate over each measure, performing some action
-         *
-         * @param cb The action to perform for each measure
-         */
-        function forEachMeasure(cb) {
-            measures.forEach(function (measure, key) {
-                cb(key, measure);
-            });
-        }
-        performance.forEachMeasure = forEachMeasure;
-        /** Enables (and resets) performance measurements for the compiler. */
-        function enable() {
-            counts = ts.createMap();
-            marks = ts.createMap();
-            measures = ts.createMap();
-            enabled = true;
-            profilerStart = ts.timestamp();
-        }
-        performance.enable = enable;
-        /** Disables performance measurements for the compiler. */
-        function disable() {
-            enabled = false;
-        }
-        performance.disable = disable;
-    })(performance = ts.performance || (ts.performance = {}));
-})(ts || (ts = {}));
-var ts;
-(function (ts) {
-    // WARNING: The script `configureNightly.ts` uses a regexp to parse out these values.
-    // If changing the text in this section, be sure to test `configureNightly` too.
-    ts.versionMajorMinor = "3.0";
-    /** The version of the TypeScript compiler release */
-    ts.version = ts.versionMajorMinor + ".0-dev";
-})(ts || (ts = {}));
-(function (ts) {
-    function isExternalModuleNameRelative(moduleName) {
-        // TypeScript 1.0 spec (April 2014): 11.2.1
-        // An external module name is "relative" if the first term is "." or "..".
-        // Update: We also consider a path like `C:\foo.ts` "relative" because we do not search for it in `node_modules` or treat it as an ambient module.
-        return ts.pathIsRelative(moduleName) || ts.isRootedDiskPath(moduleName);
-    }
-    ts.isExternalModuleNameRelative = isExternalModuleNameRelative;
-    function sortAndDeduplicateDiagnostics(diagnostics) {
-        return ts.sortAndDeduplicate(diagnostics, ts.compareDiagnostics);
-    }
-    ts.sortAndDeduplicateDiagnostics = sortAndDeduplicateDiagnostics;
-})(ts || (ts = {}));
-/* @internal */
-(function (ts) {
-    ts.emptyArray = [];
-    function closeFileWatcher(watcher) {
-        watcher.close();
-    }
-    ts.closeFileWatcher = closeFileWatcher;
-    /** Create a MapLike with good performance. */
-    function createDictionaryObject() {
-        var map = Object.create(/*prototype*/ null); // tslint:disable-line:no-null-keyword
-        // Using 'delete' on an object causes V8 to put the object in dictionary mode.
-        // This disables creation of hidden classes, which are expensive when an object is
-        // constantly changing shape.
-        map.__ = undefined;
-        delete map.__;
-        return map;
-    }
-    /** Create a new map. If a template object is provided, the map will copy entries from it. */
-    function createMap() {
-        return new MapCtr();
-    }
-    ts.createMap = createMap;
-    /** Create a new escaped identifier map. */
-    function createUnderscoreEscapedMap() {
-        return new MapCtr();
-    }
-    ts.createUnderscoreEscapedMap = createUnderscoreEscapedMap;
-    function createSymbolTable(symbols) {
-        var result = createMap();
-        if (symbols) {
-            for (var _i = 0, symbols_1 = symbols; _i < symbols_1.length; _i++) {
-                var symbol = symbols_1[_i];
-                result.set(symbol.escapedName, symbol);
-            }
-        }
-        return result;
-    }
-    ts.createSymbolTable = createSymbolTable;
-    function createMapFromTemplate(template) {
-        var map = new MapCtr();
-        // Copies keys/values from template. Note that for..in will not throw if
-        // template is undefined, and instead will just exit the loop.
-        for (var key in template) {
-            if (hasOwnProperty.call(template, key)) {
-                map.set(key, template[key]);
-            }
-        }
-        return map;
-    }
-    ts.createMapFromTemplate = createMapFromTemplate;
-    // Internet Explorer's Map doesn't support iteration, so don't use it.
-    // tslint:disable-next-line no-in-operator variable-name
-    var MapCtr = typeof Map !== "undefined" && "entries" in Map.prototype ? Map : shimMap();
-    // Keep the class inside a function so it doesn't get compiled if it's not used.
-    function shimMap() {
-        var MapIterator = /** @class */ (function () {
-            function MapIterator(data, selector) {
-                this.index = 0;
-                this.data = data;
-                this.selector = selector;
-                this.keys = Object.keys(data);
-            }
-            MapIterator.prototype.next = function () {
-                var index = this.index;
-                if (index < this.keys.length) {
-                    this.index++;
-                    return { value: this.selector(this.data, this.keys[index]), done: false };
-                }
-                return { value: undefined, done: true };
-            };
-            return MapIterator;
-        }());
-        return /** @class */ (function () {
-            function class_1() {
-                this.data = createDictionaryObject();
-                this.size = 0;
-            }
-            class_1.prototype.get = function (key) {
-                return this.data[key];
-            };
-            class_1.prototype.set = function (key, value) {
-                if (!this.has(key)) {
-                    this.size++;
-                }
-                this.data[key] = value;
-                return this;
-            };
-            class_1.prototype.has = function (key) {
-                // tslint:disable-next-line:no-in-operator
-                return key in this.data;
-            };
-            class_1.prototype.delete = function (key) {
-                if (this.has(key)) {
-                    this.size--;
-                    delete this.data[key];
-                    return true;
-                }
-                return false;
-            };
-            class_1.prototype.clear = function () {
-                this.data = createDictionaryObject();
-                this.size = 0;
-            };
-            class_1.prototype.keys = function () {
-                return new MapIterator(this.data, function (_data, key) { return key; });
-            };
-            class_1.prototype.values = function () {
-                return new MapIterator(this.data, function (data, key) { return data[key]; });
-            };
-            class_1.prototype.entries = function () {
-                return new MapIterator(this.data, function (data, key) { return [key, data[key]]; });
-            };
-            class_1.prototype.forEach = function (action) {
-                for (var key in this.data) {
-                    action(this.data[key], key);
-                }
-            };
-            return class_1;
-        }());
-    }
-    function toPath(fileName, basePath, getCanonicalFileName) {
-        var nonCanonicalizedPath = isRootedDiskPath(fileName)
-            ? normalizePath(fileName)
-            : getNormalizedAbsolutePath(fileName, basePath);
-        return getCanonicalFileName(nonCanonicalizedPath);
-    }
-    ts.toPath = toPath;
-    function length(array) {
-        return array ? array.length : 0;
-    }
-    ts.length = length;
-    function hasEntries(map) {
-        return !!map && !!map.size;
-    }
-    ts.hasEntries = hasEntries;
-    /**
-     * Iterates through 'array' by index and performs the callback on each element of array until the callback
-     * returns a truthy value, then returns that value.
-     * If no such value is found, the callback is applied to each element of array and undefined is returned.
-     */
-    function forEach(array, callback) {
-        if (array) {
-            for (var i = 0; i < array.length; i++) {
-                var result = callback(array[i], i);
-                if (result) {
-                    return result;
-                }
-            }
-        }
-        return undefined;
-    }
-    ts.forEach = forEach;
-    /** Like `forEach`, but suitable for use with numbers and strings (which may be falsy). */
-    function firstDefined(array, callback) {
-        if (array === undefined) {
-            return undefined;
-        }
-        for (var i = 0; i < array.length; i++) {
-            var result = callback(array[i], i);
-            if (result !== undefined) {
-                return result;
-            }
-        }
-        return undefined;
-    }
-    ts.firstDefined = firstDefined;
-    function firstDefinedIterator(iter, callback) {
-        while (true) {
-            var _a = iter.next(), value = _a.value, done = _a.done;
-            if (done) {
-                return undefined;
-            }
-            var result = callback(value);
-            if (result !== undefined) {
-                return result;
-            }
-        }
-    }
-    ts.firstDefinedIterator = firstDefinedIterator;
-    function findAncestor(node, callback) {
-        while (node) {
-            var result = callback(node);
-            if (result === "quit") {
-                return undefined;
-            }
-            else if (result) {
-                return node;
-            }
-            node = node.parent;
-        }
-        return undefined;
-    }
-    ts.findAncestor = findAncestor;
-    function zipWith(arrayA, arrayB, callback) {
-        var result = [];
-        Debug.assertEqual(arrayA.length, arrayB.length);
-        for (var i = 0; i < arrayA.length; i++) {
-            result.push(callback(arrayA[i], arrayB[i], i));
-        }
-        return result;
-    }
-    ts.zipWith = zipWith;
-    function zipToIterator(arrayA, arrayB) {
-        Debug.assertEqual(arrayA.length, arrayB.length);
-        var i = 0;
-        return {
-            next: function () {
-                if (i === arrayA.length) {
-                    return { value: undefined, done: true };
-                }
-                i++;
-                return { value: [arrayA[i - 1], arrayB[i - 1]], done: false };
-            }
-        };
-    }
-    ts.zipToIterator = zipToIterator;
-    function zipToMap(keys, values) {
-        Debug.assert(keys.length === values.length);
-        var map = createMap();
-        for (var i = 0; i < keys.length; ++i) {
-            map.set(keys[i], values[i]);
-        }
-        return map;
-    }
-    ts.zipToMap = zipToMap;
-    /**
-     * Iterates through `array` by index and performs the callback on each element of array until the callback
-     * returns a falsey value, then returns false.
-     * If no such value is found, the callback is applied to each element of array and `true` is returned.
-     */
-    function every(array, callback) {
-        if (array) {
-            for (var i = 0; i < array.length; i++) {
-                if (!callback(array[i], i)) {
-                    return false;
-                }
-            }
-        }
-        return true;
-    }
-    ts.every = every;
-    function find(array, predicate) {
-        for (var i = 0; i < array.length; i++) {
-            var value = array[i];
-            if (predicate(value, i)) {
-                return value;
-            }
-        }
-        return undefined;
-    }
-    ts.find = find;
-    function findLast(array, predicate) {
-        for (var i = array.length - 1; i >= 0; i--) {
-            var value = array[i];
-            if (predicate(value, i)) {
-                return value;
-            }
-        }
-        return undefined;
-    }
-    ts.findLast = findLast;
-    /** Works like Array.prototype.findIndex, returning `-1` if no element satisfying the predicate is found. */
-    function findIndex(array, predicate, startIndex) {
-        for (var i = startIndex || 0; i < array.length; i++) {
-            if (predicate(array[i], i)) {
-                return i;
-            }
-        }
-        return -1;
-    }
-    ts.findIndex = findIndex;
-    function findLastIndex(array, predicate, startIndex) {
-        for (var i = startIndex === undefined ? array.length - 1 : startIndex; i >= 0; i--) {
-            if (predicate(array[i], i)) {
-                return i;
-            }
-        }
-        return -1;
-    }
-    ts.findLastIndex = findLastIndex;
-    /**
-     * Returns the first truthy result of `callback`, or else fails.
-     * This is like `forEach`, but never returns undefined.
-     */
-    function findMap(array, callback) {
-        for (var i = 0; i < array.length; i++) {
-            var result = callback(array[i], i);
-            if (result) {
-                return result;
-            }
-        }
-        return Debug.fail();
-    }
-    ts.findMap = findMap;
-    function contains(array, value, equalityComparer) {
-        if (equalityComparer === void 0) { equalityComparer = equateValues; }
-        if (array) {
-            for (var _i = 0, array_1 = array; _i < array_1.length; _i++) {
-                var v = array_1[_i];
-                if (equalityComparer(v, value)) {
-                    return true;
-                }
-            }
-        }
-        return false;
-    }
-    ts.contains = contains;
-    function arraysEqual(a, b, equalityComparer) {
-        if (equalityComparer === void 0) { equalityComparer = equateValues; }
-        return a.length === b.length && a.every(function (x, i) { return equalityComparer(x, b[i]); });
-    }
-    ts.arraysEqual = arraysEqual;
-    function indexOfAnyCharCode(text, charCodes, start) {
-        for (var i = start || 0; i < text.length; i++) {
-            if (contains(charCodes, text.charCodeAt(i))) {
-                return i;
-            }
-        }
-        return -1;
-    }
-    ts.indexOfAnyCharCode = indexOfAnyCharCode;
-    function countWhere(array, predicate) {
-        var count = 0;
-        if (array) {
-            for (var i = 0; i < array.length; i++) {
-                var v = array[i];
-                if (predicate(v, i)) {
-                    count++;
-                }
-            }
-        }
-        return count;
-    }
-    ts.countWhere = countWhere;
-    function filter(array, f) {
-        if (array) {
-            var len = array.length;
-            var i = 0;
-            while (i < len && f(array[i]))
-                i++;
-            if (i < len) {
-                var result = array.slice(0, i);
-                i++;
-                while (i < len) {
-                    var item = array[i];
-                    if (f(item)) {
-                        result.push(item);
-                    }
-                    i++;
-                }
-                return result;
-            }
-        }
-        return array;
-    }
-    ts.filter = filter;
-    function filterMutate(array, f) {
-        var outIndex = 0;
-        for (var i = 0; i < array.length; i++) {
-            if (f(array[i], i, array)) {
-                array[outIndex] = array[i];
-                outIndex++;
-            }
-        }
-        array.length = outIndex;
-    }
-    ts.filterMutate = filterMutate;
-    function clear(array) {
-        array.length = 0;
-    }
-    ts.clear = clear;
-    function map(array, f) {
-        var result;
-        if (array) {
-            result = [];
-            for (var i = 0; i < array.length; i++) {
-                result.push(f(array[i], i));
-            }
-        }
-        return result;
-    }
-    ts.map = map;
-    function mapIterator(iter, mapFn) {
-        return {
-            next: function () {
-                var iterRes = iter.next();
-                return iterRes.done ? iterRes : { value: mapFn(iterRes.value), done: false };
-            }
-        };
-    }
-    ts.mapIterator = mapIterator;
-    function sameMap(array, f) {
-        if (array) {
-            for (var i = 0; i < array.length; i++) {
-                var item = array[i];
-                var mapped = f(item, i);
-                if (item !== mapped) {
-                    var result = array.slice(0, i);
-                    result.push(mapped);
-                    for (i++; i < array.length; i++) {
-                        result.push(f(array[i], i));
-                    }
-                    return result;
-                }
-            }
-        }
-        return array;
-    }
-    ts.sameMap = sameMap;
-    function flatten(array) {
-        var result;
-        if (array) {
-            result = [];
-            for (var _i = 0, array_2 = array; _i < array_2.length; _i++) {
-                var v = array_2[_i];
-                if (v) {
-                    if (isArray(v)) {
-                        addRange(result, v);
-                    }
-                    else {
-                        result.push(v);
-                    }
-                }
-            }
-        }
-        return result;
-    }
-    ts.flatten = flatten;
-    function flatMap(array, mapfn) {
-        var result;
-        if (array) {
-            result = [];
-            for (var i = 0; i < array.length; i++) {
-                var v = mapfn(array[i], i);
-                if (v) {
-                    if (isArray(v)) {
-                        addRange(result, v);
-                    }
-                    else {
-                        result.push(v);
-                    }
-                }
-            }
-        }
-        return result;
-    }
-    ts.flatMap = flatMap;
-    function flatMapIterator(iter, mapfn) {
-        var first = iter.next();
-        if (first.done) {
-            return ts.emptyIterator;
-        }
-        var currentIter = getIterator(first.value);
-        return {
-            next: function () {
-                while (true) {
-                    var currentRes = currentIter.next();
-                    if (!currentRes.done) {
-                        return currentRes;
-                    }
-                    var iterRes = iter.next();
-                    if (iterRes.done) {
-                        return iterRes;
-                    }
-                    currentIter = getIterator(iterRes.value);
-                }
-            },
-        };
-        function getIterator(x) {
-            var res = mapfn(x);
-            return res === undefined ? ts.emptyIterator : isArray(res) ? arrayIterator(res) : res;
-        }
-    }
-    ts.flatMapIterator = flatMapIterator;
-    function sameFlatMap(array, mapfn) {
-        var result;
-        if (array) {
-            for (var i = 0; i < array.length; i++) {
-                var item = array[i];
-                var mapped = mapfn(item, i);
-                if (result || item !== mapped || isArray(mapped)) {
-                    if (!result) {
-                        result = array.slice(0, i);
-                    }
-                    if (isArray(mapped)) {
-                        addRange(result, mapped);
-                    }
-                    else {
-                        result.push(mapped);
-                    }
-                }
-            }
-        }
-        return result || array;
-    }
-    ts.sameFlatMap = sameFlatMap;
-    function mapAllOrFail(array, mapFn) {
-        var result = [];
-        for (var i = 0; i < array.length; i++) {
-            var mapped = mapFn(array[i], i);
-            if (mapped === undefined) {
-                return undefined;
-            }
-            result.push(mapped);
-        }
-        return result;
-    }
-    ts.mapAllOrFail = mapAllOrFail;
-    function mapDefined(array, mapFn) {
-        var result = [];
-        if (array) {
-            for (var i = 0; i < array.length; i++) {
-                var mapped = mapFn(array[i], i);
-                if (mapped !== undefined) {
-                    result.push(mapped);
-                }
-            }
-        }
-        return result;
-    }
-    ts.mapDefined = mapDefined;
-    function mapDefinedIterator(iter, mapFn) {
-        return {
-            next: function () {
-                while (true) {
-                    var res = iter.next();
-                    if (res.done) {
-                        return res;
-                    }
-                    var value = mapFn(res.value);
-                    if (value !== undefined) {
-                        return { value: value, done: false };
-                    }
-                }
-            }
-        };
-    }
-    ts.mapDefinedIterator = mapDefinedIterator;
-    ts.emptyIterator = { next: function () { return ({ value: undefined, done: true }); } };
-    function singleIterator(value) {
-        var done = false;
-        return {
-            next: function () {
-                var wasDone = done;
-                done = true;
-                return wasDone ? { value: undefined, done: true } : { value: value, done: false };
-            }
-        };
-    }
-    ts.singleIterator = singleIterator;
-    function spanMap(array, keyfn, mapfn) {
-        var result;
-        if (array) {
-            result = [];
-            var len = array.length;
-            var previousKey = void 0;
-            var key = void 0;
-            var start = 0;
-            var pos = 0;
-            while (start < len) {
-                while (pos < len) {
-                    var value = array[pos];
-                    key = keyfn(value, pos);
-                    if (pos === 0) {
-                        previousKey = key;
-                    }
-                    else if (key !== previousKey) {
-                        break;
-                    }
-                    pos++;
-                }
-                if (start < pos) {
-                    var v = mapfn(array.slice(start, pos), previousKey, start, pos);
-                    if (v) {
-                        result.push(v);
-                    }
-                    start = pos;
-                }
-                previousKey = key;
-                pos++;
-            }
-        }
-        return result;
-    }
-    ts.spanMap = spanMap;
-    function mapEntries(map, f) {
-        if (!map) {
-            return undefined;
-        }
-        var result = createMap();
-        map.forEach(function (value, key) {
-            var _a = f(key, value), newKey = _a[0], newValue = _a[1];
-            result.set(newKey, newValue);
-        });
-        return result;
-    }
-    ts.mapEntries = mapEntries;
-    function some(array, predicate) {
-        if (array) {
-            if (predicate) {
-                for (var _i = 0, array_3 = array; _i < array_3.length; _i++) {
-                    var v = array_3[_i];
-                    if (predicate(v)) {
-                        return true;
-                    }
-                }
-            }
-            else {
-                return array.length > 0;
-            }
-        }
-        return false;
-    }
-    ts.some = some;
-    /** Calls the callback with (start, afterEnd) index pairs for each range where 'pred' is true. */
-    function getRangesWhere(arr, pred, cb) {
-        var start;
-        for (var i = 0; i < arr.length; i++) {
-            if (pred(arr[i])) {
-                start = start === undefined ? i : start;
-            }
-            else {
-                if (start !== undefined) {
-                    cb(start, i);
-                    start = undefined;
-                }
-            }
-        }
-        if (start !== undefined)
-            cb(start, arr.length);
-    }
-    ts.getRangesWhere = getRangesWhere;
-    function concatenate(array1, array2) {
-        if (!some(array2))
-            return array1;
-        if (!some(array1))
-            return array2;
-        return array1.concat(array2);
-    }
-    ts.concatenate = concatenate;
-    function deduplicateRelational(array, equalityComparer, comparer) {
-        // Perform a stable sort of the array. This ensures the first entry in a list of
-        // duplicates remains the first entry in the result.
-        var indices = array.map(function (_, i) { return i; });
-        stableSortIndices(array, indices, comparer);
-        var last = array[indices[0]];
-        var deduplicated = [indices[0]];
-        for (var i = 1; i < indices.length; i++) {
-            var index = indices[i];
-            var item = array[index];
-            if (!equalityComparer(last, item)) {
-                deduplicated.push(index);
-                last = item;
-            }
-        }
-        // restore original order
-        deduplicated.sort();
-        return deduplicated.map(function (i) { return array[i]; });
-    }
-    function deduplicateEquality(array, equalityComparer) {
-        var result = [];
-        for (var _i = 0, array_4 = array; _i < array_4.length; _i++) {
-            var item = array_4[_i];
-            pushIfUnique(result, item, equalityComparer);
-        }
-        return result;
-    }
-    function deduplicate(array, equalityComparer, comparer) {
-        return !array ? undefined :
-            array.length === 0 ? [] :
-                array.length === 1 ? array.slice() :
-                    comparer ? deduplicateRelational(array, equalityComparer, comparer) :
-                        deduplicateEquality(array, equalityComparer);
-    }
-    ts.deduplicate = deduplicate;
-    function deduplicateSorted(array, comparer) {
-        if (!array)
-            return undefined;
-        if (array.length === 0)
-            return [];
-        var last = array[0];
-        var deduplicated = [last];
-        for (var i = 1; i < array.length; i++) {
-            var next = array[i];
-            switch (comparer(next, last)) {
-                // equality comparison
-                case true:
-                // relational comparison
-                case 0 /* EqualTo */:
-                    continue;
-                case -1 /* LessThan */:
-                    // If `array` is sorted, `next` should **never** be less than `last`.
-                    return Debug.fail("Array is unsorted.");
-            }
-            deduplicated.push(last = next);
-        }
-        return deduplicated;
-    }
-    function insertSorted(array, insert, compare) {
-        if (array.length === 0) {
-            array.push(insert);
-            return;
-        }
-        var insertIndex = binarySearch(array, insert, identity, compare);
-        if (insertIndex < 0) {
-            array.splice(~insertIndex, 0, insert);
-        }
-    }
-    ts.insertSorted = insertSorted;
-    function sortAndDeduplicate(array, comparer, equalityComparer) {
-        return deduplicateSorted(sort(array, comparer), equalityComparer || comparer);
-    }
-    ts.sortAndDeduplicate = sortAndDeduplicate;
-    function arrayIsEqualTo(array1, array2, equalityComparer) {
-        if (equalityComparer === void 0) { equalityComparer = equateValues; }
-        if (!array1 || !array2) {
-            return array1 === array2;
-        }
-        if (array1.length !== array2.length) {
-            return false;
-        }
-        for (var i = 0; i < array1.length; i++) {
-            if (!equalityComparer(array1[i], array2[i])) {
-                return false;
-            }
-        }
-        return true;
-    }
-    ts.arrayIsEqualTo = arrayIsEqualTo;
-    function changesAffectModuleResolution(oldOptions, newOptions) {
-        return !oldOptions ||
-            (oldOptions.module !== newOptions.module) ||
-            (oldOptions.moduleResolution !== newOptions.moduleResolution) ||
-            (oldOptions.noResolve !== newOptions.noResolve) ||
-            (oldOptions.target !== newOptions.target) ||
-            (oldOptions.noLib !== newOptions.noLib) ||
-            (oldOptions.jsx !== newOptions.jsx) ||
-            (oldOptions.allowJs !== newOptions.allowJs) ||
-            (oldOptions.rootDir !== newOptions.rootDir) ||
-            (oldOptions.configFilePath !== newOptions.configFilePath) ||
-            (oldOptions.baseUrl !== newOptions.baseUrl) ||
-            (oldOptions.maxNodeModuleJsDepth !== newOptions.maxNodeModuleJsDepth) ||
-            !arrayIsEqualTo(oldOptions.lib, newOptions.lib) ||
-            !arrayIsEqualTo(oldOptions.typeRoots, newOptions.typeRoots) ||
-            !arrayIsEqualTo(oldOptions.rootDirs, newOptions.rootDirs) ||
-            !equalOwnProperties(oldOptions.paths, newOptions.paths);
-    }
-    ts.changesAffectModuleResolution = changesAffectModuleResolution;
-    function compact(array) {
-        var result;
-        if (array) {
-            for (var i = 0; i < array.length; i++) {
-                var v = array[i];
-                if (result || !v) {
-                    if (!result) {
-                        result = array.slice(0, i);
-                    }
-                    if (v) {
-                        result.push(v);
-                    }
-                }
-            }
-        }
-        return result || array;
-    }
-    ts.compact = compact;
-    /**
-     * Gets the relative complement of `arrayA` with respect to `arrayB`, returning the elements that
-     * are not present in `arrayA` but are present in `arrayB`. Assumes both arrays are sorted
-     * based on the provided comparer.
-     */
-    function relativeComplement(arrayA, arrayB, comparer) {
-        if (!arrayB || !arrayA || arrayB.length === 0 || arrayA.length === 0)
-            return arrayB;
-        var result = [];
-        loopB: for (var offsetA = 0, offsetB = 0; offsetB < arrayB.length; offsetB++) {
-            if (offsetB > 0) {
-                // Ensure `arrayB` is properly sorted.
-                Debug.assertGreaterThanOrEqual(comparer(arrayB[offsetB], arrayB[offsetB - 1]), 0 /* EqualTo */);
-            }
-            loopA: for (var startA = offsetA; offsetA < arrayA.length; offsetA++) {
-                if (offsetA > startA) {
-                    // Ensure `arrayA` is properly sorted. We only need to perform this check if
-                    // `offsetA` has changed since we entered the loop.
-                    Debug.assertGreaterThanOrEqual(comparer(arrayA[offsetA], arrayA[offsetA - 1]), 0 /* EqualTo */);
-                }
-                switch (comparer(arrayB[offsetB], arrayA[offsetA])) {
-                    case -1 /* LessThan */:
-                        // If B is less than A, B does not exist in arrayA. Add B to the result and
-                        // move to the next element in arrayB without changing the current position
-                        // in arrayA.
-                        result.push(arrayB[offsetB]);
-                        continue loopB;
-                    case 0 /* EqualTo */:
-                        // If B is equal to A, B exists in arrayA. Move to the next element in
-                        // arrayB without adding B to the result or changing the current position
-                        // in arrayA.
-                        continue loopB;
-                    case 1 /* GreaterThan */:
-                        // If B is greater than A, we need to keep looking for B in arrayA. Move to
-                        // the next element in arrayA and recheck.
-                        continue loopA;
-                }
-            }
-        }
-        return result;
-    }
-    ts.relativeComplement = relativeComplement;
-    function sum(array, prop) {
-        var result = 0;
-        for (var _i = 0, array_5 = array; _i < array_5.length; _i++) {
-            var v = array_5[_i];
-            result += v[prop];
-        }
-        return result;
-    }
-    ts.sum = sum;
-    function append(to, value) {
-        if (value === undefined)
-            return to;
-        if (to === undefined)
-            return [value];
-        to.push(value);
-        return to;
-    }
-    ts.append = append;
-    /**
-     * Gets the actual offset into an array for a relative offset. Negative offsets indicate a
-     * position offset from the end of the array.
-     */
-    function toOffset(array, offset) {
-        return offset < 0 ? array.length + offset : offset;
-    }
-    function addRange(to, from, start, end) {
-        if (from === undefined || from.length === 0)
-            return to;
-        if (to === undefined)
-            return from.slice(start, end);
-        start = start === undefined ? 0 : toOffset(from, start);
-        end = end === undefined ? from.length : toOffset(from, end);
-        for (var i = start; i < end && i < from.length; i++) {
-            if (from[i] !== undefined) {
-                to.push(from[i]);
-            }
-        }
-        return to;
-    }
-    ts.addRange = addRange;
-    /**
-     * @return Whether the value was added.
-     */
-    function pushIfUnique(array, toAdd, equalityComparer) {
-        if (contains(array, toAdd, equalityComparer)) {
-            return false;
-        }
-        else {
-            array.push(toAdd);
-            return true;
-        }
-    }
-    ts.pushIfUnique = pushIfUnique;
-    /**
-     * Unlike `pushIfUnique`, this can take `undefined` as an input, and returns a new array.
-     */
-    function appendIfUnique(array, toAdd, equalityComparer) {
-        if (array) {
-            pushIfUnique(array, toAdd, equalityComparer);
-            return array;
-        }
-        else {
-            return [toAdd];
-        }
-    }
-    ts.appendIfUnique = appendIfUnique;
-    function stableSortIndices(array, indices, comparer) {
-        // sort indices by value then position
-        indices.sort(function (x, y) { return comparer(array[x], array[y]) || compareValues(x, y); });
-    }
-    /**
-     * Returns a new sorted array.
-     */
-    function sort(array, comparer) {
-        return array.slice().sort(comparer);
-    }
-    ts.sort = sort;
-    function best(iter, isBetter) {
-        var x = iter.next();
-        if (x.done) {
-            return undefined;
-        }
-        var best = x.value;
-        while (true) {
-            var _a = iter.next(), value = _a.value, done = _a.done;
-            if (done) {
-                return best;
-            }
-            if (isBetter(value, best)) {
-                best = value;
-            }
-        }
-    }
-    ts.best = best;
-    function arrayIterator(array) {
-        var i = 0;
-        return { next: function () {
-                if (i === array.length) {
-                    return { value: undefined, done: true };
-                }
-                else {
-                    i++;
-                    return { value: array[i - 1], done: false };
-                }
-            } };
-    }
-    ts.arrayIterator = arrayIterator;
-    /**
-     * Stable sort of an array. Elements equal to each other maintain their relative position in the array.
-     */
-    function stableSort(array, comparer) {
-        var indices = array.map(function (_, i) { return i; });
-        stableSortIndices(array, indices, comparer);
-        return indices.map(function (i) { return array[i]; });
-    }
-    ts.stableSort = stableSort;
-    function rangeEquals(array1, array2, pos, end) {
-        while (pos < end) {
-            if (array1[pos] !== array2[pos]) {
-                return false;
-            }
-            pos++;
-        }
-        return true;
-    }
-    ts.rangeEquals = rangeEquals;
-    /**
-     * Returns the element at a specific offset in an array if non-empty, `undefined` otherwise.
-     * A negative offset indicates the element should be retrieved from the end of the array.
-     */
-    function elementAt(array, offset) {
-        if (array) {
-            offset = toOffset(array, offset);
-            if (offset < array.length) {
-                return array[offset];
-            }
-        }
-        return undefined;
-    }
-    ts.elementAt = elementAt;
-    /**
-     * Returns the first element of an array if non-empty, `undefined` otherwise.
-     */
-    function firstOrUndefined(array) {
-        return array.length === 0 ? undefined : array[0];
-    }
-    ts.firstOrUndefined = firstOrUndefined;
-    function first(array) {
-        Debug.assert(array.length !== 0);
-        return array[0];
-    }
-    ts.first = first;
-    /**
-     * Returns the last element of an array if non-empty, `undefined` otherwise.
-     */
-    function lastOrUndefined(array) {
-        return array.length === 0 ? undefined : array[array.length - 1];
-    }
-    ts.lastOrUndefined = lastOrUndefined;
-    function last(array) {
-        Debug.assert(array.length !== 0);
-        return array[array.length - 1];
-    }
-    ts.last = last;
-    /**
-     * Returns the only element of an array if it contains only one element, `undefined` otherwise.
-     */
-    function singleOrUndefined(array) {
-        return array && array.length === 1
-            ? array[0]
-            : undefined;
-    }
-    ts.singleOrUndefined = singleOrUndefined;
-    function singleOrMany(array) {
-        return array && array.length === 1
-            ? array[0]
-            : array;
-    }
-    ts.singleOrMany = singleOrMany;
-    function replaceElement(array, index, value) {
-        var result = array.slice(0);
-        result[index] = value;
-        return result;
-    }
-    ts.replaceElement = replaceElement;
-    /**
-     * Performs a binary search, finding the index at which `value` occurs in `array`.
-     * If no such index is found, returns the 2's-complement of first index at which
-     * `array[index]` exceeds `value`.
-     * @param array A sorted array whose first element must be no larger than number
-     * @param value The value to be searched for in the array.
-     * @param keySelector A callback used to select the search key from `value` and each element of
-     * `array`.
-     * @param keyComparer A callback used to compare two keys in a sorted array.
-     * @param offset An offset into `array` at which to start the search.
-     */
-    function binarySearch(array, value, keySelector, keyComparer, offset) {
-        if (!array || array.length === 0) {
-            return -1;
-        }
-        var low = offset || 0;
-        var high = array.length - 1;
-        var key = keySelector(value);
-        while (low <= high) {
-            var middle = low + ((high - low) >> 1);
-            var midKey = keySelector(array[middle]);
-            switch (keyComparer(midKey, key)) {
-                case -1 /* LessThan */:
-                    low = middle + 1;
-                    break;
-                case 0 /* EqualTo */:
-                    return middle;
-                case 1 /* GreaterThan */:
-                    high = middle - 1;
-                    break;
-            }
-        }
-        return ~low;
-    }
-    ts.binarySearch = binarySearch;
-    function reduceLeft(array, f, initial, start, count) {
-        if (array && array.length > 0) {
-            var size = array.length;
-            if (size > 0) {
-                var pos = start === undefined || start < 0 ? 0 : start;
-                var end = count === undefined || pos + count > size - 1 ? size - 1 : pos + count;
-                var result = void 0;
-                if (arguments.length <= 2) {
-                    result = array[pos];
-                    pos++;
-                }
-                else {
-                    result = initial;
-                }
-                while (pos <= end) {
-                    result = f(result, array[pos], pos);
-                    pos++;
-                }
-                return result;
-            }
-        }
-        return initial;
-    }
-    ts.reduceLeft = reduceLeft;
-    var hasOwnProperty = Object.prototype.hasOwnProperty;
-    /**
-     * Indicates whether a map-like contains an own property with the specified key.
-     *
-     * @param map A map-like.
-     * @param key A property key.
-     */
-    function hasProperty(map, key) {
-        return hasOwnProperty.call(map, key);
-    }
-    ts.hasProperty = hasProperty;
-    /**
-     * Gets the value of an owned property in a map-like.
-     *
-     * @param map A map-like.
-     * @param key A property key.
-     */
-    function getProperty(map, key) {
-        return hasOwnProperty.call(map, key) ? map[key] : undefined;
-    }
-    ts.getProperty = getProperty;
-    /**
-     * Gets the owned, enumerable property keys of a map-like.
-     */
-    function getOwnKeys(map) {
-        var keys = [];
-        for (var key in map) {
-            if (hasOwnProperty.call(map, key)) {
-                keys.push(key);
-            }
-        }
-        return keys;
-    }
-    ts.getOwnKeys = getOwnKeys;
-    function getOwnValues(sparseArray) {
-        var values = [];
-        for (var key in sparseArray) {
-            if (hasOwnProperty.call(sparseArray, key)) {
-                values.push(sparseArray[key]);
-            }
-        }
-        return values;
-    }
-    ts.getOwnValues = getOwnValues;
-    function arrayFrom(iterator, map) {
-        var _a;
-        var result = [];
-        for (var _b = iterator.next(), value = _b.value, done = _b.done; !done; _a = iterator.next(), value = _a.value, done = _a.done, _a) {
-            result.push(map ? map(value) : value);
-        }
-        return result;
-    }
-    ts.arrayFrom = arrayFrom;
-    function forEachEntry(map, callback) {
-        var _a;
-        var iterator = map.entries();
-        for (var _b = iterator.next(), pair = _b.value, done = _b.done; !done; _a = iterator.next(), pair = _a.value, done = _a.done, _a) {
-            var key = pair[0], value = pair[1];
-            var result = callback(value, key);
-            if (result) {
-                return result;
-            }
-        }
-        return undefined;
-    }
-    ts.forEachEntry = forEachEntry;
-    function forEachKey(map, callback) {
-        var _a;
-        var iterator = map.keys();
-        for (var _b = iterator.next(), key = _b.value, done = _b.done; !done; _a = iterator.next(), key = _a.value, done = _a.done, _a) {
-            var result = callback(key);
-            if (result) {
-                return result;
-            }
-        }
-        return undefined;
-    }
-    ts.forEachKey = forEachKey;
-    function copyEntries(source, target) {
-        source.forEach(function (value, key) {
-            target.set(key, value);
-        });
-    }
-    ts.copyEntries = copyEntries;
-    function assign(t) {
-        var args = [];
-        for (var _i = 1; _i < arguments.length; _i++) {
-            args[_i - 1] = arguments[_i];
-        }
-        for (var _a = 0, args_1 = args; _a < args_1.length; _a++) {
-            var arg = args_1[_a];
-            for (var p in arg) {
-                if (hasProperty(arg, p)) {
-                    t[p] = arg[p]; // TODO: GH#23368
-                }
-            }
-        }
-        return t;
-    }
-    ts.assign = assign;
-    /**
-     * Performs a shallow equality comparison of the contents of two map-likes.
-     *
-     * @param left A map-like whose properties should be compared.
-     * @param right A map-like whose properties should be compared.
-     */
-    function equalOwnProperties(left, right, equalityComparer) {
-        if (equalityComparer === void 0) { equalityComparer = equateValues; }
-        if (left === right)
-            return true;
-        if (!left || !right)
-            return false;
-        for (var key in left) {
-            if (hasOwnProperty.call(left, key)) {
-                if (!hasOwnProperty.call(right, key) === undefined)
-                    return false;
-                if (!equalityComparer(left[key], right[key]))
-                    return false;
-            }
-        }
-        for (var key in right) {
-            if (hasOwnProperty.call(right, key)) {
-                if (!hasOwnProperty.call(left, key))
-                    return false;
-            }
-        }
-        return true;
-    }
-    ts.equalOwnProperties = equalOwnProperties;
-    function arrayToMap(array, makeKey, makeValue) {
-        if (makeValue === void 0) { makeValue = identity; }
-        var result = createMap();
-        for (var _i = 0, array_6 = array; _i < array_6.length; _i++) {
-            var value = array_6[_i];
-            var key = makeKey(value);
-            if (key !== undefined)
-                result.set(key, makeValue(value));
-        }
-        return result;
-    }
-    ts.arrayToMap = arrayToMap;
-    function arrayToNumericMap(array, makeKey, makeValue) {
-        if (makeValue === void 0) { makeValue = identity; }
-        var result = [];
-        for (var _i = 0, array_7 = array; _i < array_7.length; _i++) {
-            var value = array_7[_i];
-            result[makeKey(value)] = makeValue(value);
-        }
-        return result;
-    }
-    ts.arrayToNumericMap = arrayToNumericMap;
-    function arrayToSet(array, makeKey) {
-        return arrayToMap(array, makeKey || (function (s) { return s; }), function () { return true; });
-    }
-    ts.arrayToSet = arrayToSet;
-    function arrayToMultiMap(values, makeKey, makeValue) {
-        if (makeValue === void 0) { makeValue = identity; }
-        var result = createMultiMap();
-        for (var _i = 0, values_1 = values; _i < values_1.length; _i++) {
-            var value = values_1[_i];
-            result.add(makeKey(value), makeValue(value));
-        }
-        return result;
-    }
-    ts.arrayToMultiMap = arrayToMultiMap;
-    function group(values, getGroupId) {
-        return arrayFrom(arrayToMultiMap(values, getGroupId).values());
-    }
-    ts.group = group;
-    function cloneMap(map) {
-        var clone = createMap();
-        copyEntries(map, clone);
-        return clone;
-    }
-    ts.cloneMap = cloneMap;
-    function clone(object) {
-        var result = {};
-        for (var id in object) {
-            if (hasOwnProperty.call(object, id)) {
-                result[id] = object[id];
-            }
-        }
-        return result;
-    }
-    ts.clone = clone;
-    function extend(first, second) {
-        var result = {};
-        for (var id in second) {
-            if (hasOwnProperty.call(second, id)) {
-                result[id] = second[id];
-            }
-        }
-        for (var id in first) {
-            if (hasOwnProperty.call(first, id)) {
-                result[id] = first[id];
-            }
-        }
-        return result;
-    }
-    ts.extend = extend;
-    function createMultiMap() {
-        var map = createMap();
-        map.add = multiMapAdd;
-        map.remove = multiMapRemove;
-        return map;
-    }
-    ts.createMultiMap = createMultiMap;
-    function multiMapAdd(key, value) {
-        var values = this.get(key);
-        if (values) {
-            values.push(value);
-        }
-        else {
-            this.set(key, values = [value]);
-        }
-        return values;
-    }
-    function multiMapRemove(key, value) {
-        var values = this.get(key);
-        if (values) {
-            unorderedRemoveItem(values, value);
-            if (!values.length) {
-                this.delete(key);
-            }
-        }
-    }
-    /**
-     * Tests whether a value is an array.
-     */
-    function isArray(value) {
-        return Array.isArray ? Array.isArray(value) : value instanceof Array;
-    }
-    ts.isArray = isArray;
-    function toArray(value) {
-        return isArray(value) ? value : [value];
-    }
-    ts.toArray = toArray;
-    /**
-     * Tests whether a value is string
-     */
-    function isString(text) {
-        return typeof text === "string";
-    }
-    ts.isString = isString;
-    function tryCast(value, test) {
-        return value !== undefined && test(value) ? value : undefined;
-    }
-    ts.tryCast = tryCast;
-    function cast(value, test) {
-        if (value !== undefined && test(value))
-            return value;
-        if (value && typeof value.kind === "number") {
-            return Debug.fail("Invalid cast. The supplied " + Debug.showSyntaxKind(value) + " did not pass the test '" + Debug.getFunctionName(test) + "'.");
-        }
-        else {
-            return Debug.fail("Invalid cast. The supplied value did not pass the test '" + Debug.getFunctionName(test) + "'.");
-        }
-    }
-    ts.cast = cast;
-    /** Does nothing. */
-    function noop(_) { } // tslint:disable-line no-empty
-    ts.noop = noop;
-    /** Do nothing and return false */
-    function returnFalse() { return false; }
-    ts.returnFalse = returnFalse;
-    /** Do nothing and return true */
-    function returnTrue() { return true; }
-    ts.returnTrue = returnTrue;
-    /** Returns its argument. */
-    function identity(x) { return x; }
-    ts.identity = identity;
-    /** Returns lower case string */
-    function toLowerCase(x) { return x.toLowerCase(); }
-    ts.toLowerCase = toLowerCase;
-    /** Throws an error because a function is not implemented. */
-    function notImplemented() {
-        throw new Error("Not implemented");
-    }
-    ts.notImplemented = notImplemented;
-    function memoize(callback) {
-        var value;
-        return function () {
-            if (callback) {
-                value = callback();
-                callback = undefined;
-            }
-            return value;
-        };
-    }
-    ts.memoize = memoize;
-    function chain(a, b, c, d, e) {
-        if (e) {
-            var args_2 = [];
-            for (var i = 0; i < arguments.length; i++) {
-                args_2[i] = arguments[i];
-            }
-            return function (t) { return compose.apply(void 0, map(args_2, function (f) { return f(t); })); };
-        }
-        else if (d) {
-            return function (t) { return compose(a(t), b(t), c(t), d(t)); };
-        }
-        else if (c) {
-            return function (t) { return compose(a(t), b(t), c(t)); };
-        }
-        else if (b) {
-            return function (t) { return compose(a(t), b(t)); };
-        }
-        else if (a) {
-            return function (t) { return compose(a(t)); };
-        }
-        else {
-            return function (_) { return function (u) { return u; }; };
-        }
-    }
-    ts.chain = chain;
-    function compose(a, b, c, d, e) {
-        if (e) {
-            var args_3 = [];
-            for (var i = 0; i < arguments.length; i++) {
-                args_3[i] = arguments[i];
-            }
-            return function (t) { return reduceLeft(args_3, function (u, f) { return f(u); }, t); };
-        }
-        else if (d) {
-            return function (t) { return d(c(b(a(t)))); };
-        }
-        else if (c) {
-            return function (t) { return c(b(a(t))); };
-        }
-        else if (b) {
-            return function (t) { return b(a(t)); };
-        }
-        else if (a) {
-            return function (t) { return a(t); };
-        }
-        else {
-            return function (t) { return t; };
-        }
-    }
-    ts.compose = compose;
-    function formatStringFromArgs(text, args, baseIndex) {
-        if (baseIndex === void 0) { baseIndex = 0; }
-        return text.replace(/{(\d+)}/g, function (_match, index) { return Debug.assertDefined(args[+index + baseIndex]); });
-    }
-    ts.formatStringFromArgs = formatStringFromArgs;
-    function getLocaleSpecificMessage(message) {
-        return ts.localizedDiagnosticMessages && ts.localizedDiagnosticMessages[message.key] || message.message;
-    }
-    ts.getLocaleSpecificMessage = getLocaleSpecificMessage;
-    function createFileDiagnostic(file, start, length, message) {
-        Debug.assertGreaterThanOrEqual(start, 0);
-        Debug.assertGreaterThanOrEqual(length, 0);
-        if (file) {
-            Debug.assertLessThanOrEqual(start, file.text.length);
-            Debug.assertLessThanOrEqual(start + length, file.text.length);
-        }
-        var text = getLocaleSpecificMessage(message);
-        if (arguments.length > 4) {
-            text = formatStringFromArgs(text, arguments, 4);
-        }
-        return {
-            file: file,
-            start: start,
-            length: length,
-            messageText: text,
-            category: message.category,
-            code: message.code,
-            reportsUnnecessary: message.reportsUnnecessary,
-        };
-    }
-    ts.createFileDiagnostic = createFileDiagnostic;
-    /* internal */
-    function formatMessage(_dummy, message) {
-        var text = getLocaleSpecificMessage(message);
-        if (arguments.length > 2) {
-            text = formatStringFromArgs(text, arguments, 2);
-        }
-        return text;
-    }
-    ts.formatMessage = formatMessage;
-    function createCompilerDiagnostic(message) {
-        var text = getLocaleSpecificMessage(message);
-        if (arguments.length > 1) {
-            text = formatStringFromArgs(text, arguments, 1);
-        }
-        return {
-            file: undefined,
-            start: undefined,
-            length: undefined,
-            messageText: text,
-            category: message.category,
-            code: message.code,
-            reportsUnnecessary: message.reportsUnnecessary,
-        };
-    }
-    ts.createCompilerDiagnostic = createCompilerDiagnostic;
-    function createCompilerDiagnosticFromMessageChain(chain) {
-        return {
-            file: undefined,
-            start: undefined,
-            length: undefined,
-            code: chain.code,
-            category: chain.category,
-            messageText: chain.next ? chain : chain.messageText,
-        };
-    }
-    ts.createCompilerDiagnosticFromMessageChain = createCompilerDiagnosticFromMessageChain;
-    function chainDiagnosticMessages(details, message) {
-        var text = getLocaleSpecificMessage(message);
-        if (arguments.length > 2) {
-            text = formatStringFromArgs(text, arguments, 2);
-        }
-        return {
-            messageText: text,
-            category: message.category,
-            code: message.code,
-            next: details
-        };
-    }
-    ts.chainDiagnosticMessages = chainDiagnosticMessages;
-    function concatenateDiagnosticMessageChains(headChain, tailChain) {
-        var lastChain = headChain;
-        while (lastChain.next) {
-            lastChain = lastChain.next;
-        }
-        lastChain.next = tailChain;
-        return headChain;
-    }
-    ts.concatenateDiagnosticMessageChains = concatenateDiagnosticMessageChains;
-    function equateValues(a, b) {
-        return a === b;
-    }
-    ts.equateValues = equateValues;
-    /**
-     * Compare the equality of two strings using a case-sensitive ordinal comparison.
-     *
-     * Case-sensitive comparisons compare both strings one code-point at a time using the integer
-     * value of each code-point after applying `toUpperCase` to each string. We always map both
-     * strings to their upper-case form as some unicode characters do not properly round-trip to
-     * lowercase (such as `ẞ` (German sharp capital s)).
-     */
-    function equateStringsCaseInsensitive(a, b) {
-        return a === b
-            || a !== undefined
-                && b !== undefined
-                && a.toUpperCase() === b.toUpperCase();
-    }
-    ts.equateStringsCaseInsensitive = equateStringsCaseInsensitive;
-    /**
-     * Compare the equality of two strings using a case-sensitive ordinal comparison.
-     *
-     * Case-sensitive comparisons compare both strings one code-point at a time using the
-     * integer value of each code-point.
-     */
-    function equateStringsCaseSensitive(a, b) {
-        return equateValues(a, b);
-    }
-    ts.equateStringsCaseSensitive = equateStringsCaseSensitive;
-    function compareComparableValues(a, b) {
-        return a === b ? 0 /* EqualTo */ :
-            a === undefined ? -1 /* LessThan */ :
-                b === undefined ? 1 /* GreaterThan */ :
-                    a < b ? -1 /* LessThan */ :
-                        1 /* GreaterThan */;
-    }
-    /**
-     * Compare two numeric values for their order relative to each other.
-     * To compare strings, use any of the `compareStrings` functions.
-     */
-    function compareValues(a, b) {
-        return compareComparableValues(a, b);
-    }
-    ts.compareValues = compareValues;
-    function min(a, b, compare) {
-        return compare(a, b) === -1 /* LessThan */ ? a : b;
-    }
-    ts.min = min;
-    /**
-     * Compare two strings using a case-insensitive ordinal comparison.
-     *
-     * Ordinal comparisons are based on the difference between the unicode code points of both
-     * strings. Characters with multiple unicode representations are considered unequal. Ordinal
-     * comparisons provide predictable ordering, but place "a" after "B".
-     *
-     * Case-insensitive comparisons compare both strings one code-point at a time using the integer
-     * value of each code-point after applying `toUpperCase` to each string. We always map both
-     * strings to their upper-case form as some unicode characters do not properly round-trip to
-     * lowercase (such as `ẞ` (German sharp capital s)).
-     */
-    function compareStringsCaseInsensitive(a, b) {
-        if (a === b)
-            return 0 /* EqualTo */;
-        if (a === undefined)
-            return -1 /* LessThan */;
-        if (b === undefined)
-            return 1 /* GreaterThan */;
-        a = a.toUpperCase();
-        b = b.toUpperCase();
-        return a < b ? -1 /* LessThan */ : a > b ? 1 /* GreaterThan */ : 0 /* EqualTo */;
-    }
-    ts.compareStringsCaseInsensitive = compareStringsCaseInsensitive;
-    /**
-     * Compare two strings using a case-sensitive ordinal comparison.
-     *
-     * Ordinal comparisons are based on the difference between the unicode code points of both
-     * strings. Characters with multiple unicode representations are considered unequal. Ordinal
-     * comparisons provide predictable ordering, but place "a" after "B".
-     *
-     * Case-sensitive comparisons compare both strings one code-point at a time using the integer
-     * value of each code-point.
-     */
-    function compareStringsCaseSensitive(a, b) {
-        return compareComparableValues(a, b);
-    }
-    ts.compareStringsCaseSensitive = compareStringsCaseSensitive;
-    function getStringComparer(ignoreCase) {
-        return ignoreCase ? compareStringsCaseInsensitive : compareStringsCaseSensitive;
-    }
-    ts.getStringComparer = getStringComparer;
-    /**
-     * Creates a string comparer for use with string collation in the UI.
-     */
-    var createUIStringComparer = (function () {
-        var defaultComparer;
-        var enUSComparer;
-        var stringComparerFactory = getStringComparerFactory();
-        return createStringComparer;
-        function compareWithCallback(a, b, comparer) {
-            if (a === b)
-                return 0 /* EqualTo */;
-            if (a === undefined)
-                return -1 /* LessThan */;
-            if (b === undefined)
-                return 1 /* GreaterThan */;
-            var value = comparer(a, b);
-            return value < 0 ? -1 /* LessThan */ : value > 0 ? 1 /* GreaterThan */ : 0 /* EqualTo */;
-        }
-        function createIntlCollatorStringComparer(locale) {
-            // Intl.Collator.prototype.compare is bound to the collator. See NOTE in
-            // http://www.ecma-international.org/ecma-402/2.0/#sec-Intl.Collator.prototype.compare
-            var comparer = new Intl.Collator(locale, { usage: "sort", sensitivity: "variant" }).compare;
-            return function (a, b) { return compareWithCallback(a, b, comparer); };
-        }
-        function createLocaleCompareStringComparer(locale) {
-            // if the locale is not the default locale (`undefined`), use the fallback comparer.
-            if (locale !== undefined)
-                return createFallbackStringComparer();
-            return function (a, b) { return compareWithCallback(a, b, compareStrings); };
-            function compareStrings(a, b) {
-                return a.localeCompare(b);
-            }
-        }
-        function createFallbackStringComparer() {
-            // An ordinal comparison puts "A" after "b", but for the UI we want "A" before "b".
-            // We first sort case insensitively.  So "Aaa" will come before "baa".
-            // Then we sort case sensitively, so "aaa" will come before "Aaa".
-            //
-            // For case insensitive comparisons we always map both strings to their
-            // upper-case form as some unicode characters do not properly round-trip to
-            // lowercase (such as `ẞ` (German sharp capital s)).
-            return function (a, b) { return compareWithCallback(a, b, compareDictionaryOrder); };
-            function compareDictionaryOrder(a, b) {
-                return compareStrings(a.toUpperCase(), b.toUpperCase()) || compareStrings(a, b);
-            }
-            function compareStrings(a, b) {
-                return a < b ? -1 /* LessThan */ : a > b ? 1 /* GreaterThan */ : 0 /* EqualTo */;
-            }
-        }
-        function getStringComparerFactory() {
-            // If the host supports Intl, we use it for comparisons using the default locale.
-            if (typeof Intl === "object" && typeof Intl.Collator === "function") {
-                return createIntlCollatorStringComparer;
-            }
-            // If the host does not support Intl, we fall back to localeCompare.
-            // localeCompare in Node v0.10 is just an ordinal comparison, so don't use it.
-            if (typeof String.prototype.localeCompare === "function" &&
-                typeof String.prototype.toLocaleUpperCase === "function" &&
-                "a".localeCompare("B") < 0) {
-                return createLocaleCompareStringComparer;
-            }
-            // Otherwise, fall back to ordinal comparison:
-            return createFallbackStringComparer;
-        }
-        function createStringComparer(locale) {
-            // Hold onto common string comparers. This avoids constantly reallocating comparers during
-            // tests.
-            if (locale === undefined) {
-                return defaultComparer || (defaultComparer = stringComparerFactory(locale));
-            }
-            else if (locale === "en-US") {
-                return enUSComparer || (enUSComparer = stringComparerFactory(locale));
-            }
-            else {
-                return stringComparerFactory(locale);
-            }
-        }
-    })();
-    var uiComparerCaseSensitive;
-    var uiLocale;
-    function getUILocale() {
-        return uiLocale;
-    }
-    ts.getUILocale = getUILocale;
-    function setUILocale(value) {
-        if (uiLocale !== value) {
-            uiLocale = value;
-            uiComparerCaseSensitive = undefined;
-        }
-    }
-    ts.setUILocale = setUILocale;
-    /**
-     * Compare two strings in a using the case-sensitive sort behavior of the UI locale.
-     *
-     * Ordering is not predictable between different host locales, but is best for displaying
-     * ordered data for UI presentation. Characters with multiple unicode representations may
-     * be considered equal.
-     *
-     * Case-sensitive comparisons compare strings that differ in base characters, or
-     * accents/diacritic marks, or case as unequal.
-     */
-    function compareStringsCaseSensitiveUI(a, b) {
-        var comparer = uiComparerCaseSensitive || (uiComparerCaseSensitive = createUIStringComparer(uiLocale));
-        return comparer(a, b);
-    }
-    ts.compareStringsCaseSensitiveUI = compareStringsCaseSensitiveUI;
-    function compareProperties(a, b, key, comparer) {
-        return a === b ? 0 /* EqualTo */ :
-            a === undefined ? -1 /* LessThan */ :
-                b === undefined ? 1 /* GreaterThan */ :
-                    comparer(a[key], b[key]);
-    }
-    ts.compareProperties = compareProperties;
-    function getDiagnosticFilePath(diagnostic) {
-        return diagnostic.file ? diagnostic.file.path : undefined;
-    }
-    function compareDiagnostics(d1, d2) {
-        return compareStringsCaseSensitive(getDiagnosticFilePath(d1), getDiagnosticFilePath(d2)) ||
-            compareValues(d1.start, d2.start) ||
-            compareValues(d1.length, d2.length) ||
-            compareValues(d1.code, d2.code) ||
-            compareMessageText(d1.messageText, d2.messageText) ||
-            0 /* EqualTo */;
-    }
-    ts.compareDiagnostics = compareDiagnostics;
-    /** True is greater than false. */
-    function compareBooleans(a, b) {
-        return compareValues(a ? 1 : 0, b ? 1 : 0);
-    }
-    ts.compareBooleans = compareBooleans;
-    function compareMessageText(t1, t2) {
-        var text1 = t1;
-        var text2 = t2;
-        while (text1 && text2) {
-            // We still have both chains.
-            var string1 = isString(text1) ? text1 : text1.messageText;
-            var string2 = isString(text2) ? text2 : text2.messageText;
-            var res = compareStringsCaseSensitive(string1, string2);
-            if (res) {
-                return res;
-            }
-            text1 = isString(text1) ? undefined : text1.next;
-            text2 = isString(text2) ? undefined : text2.next;
-        }
-        if (!text1 && !text2) {
-            // if the chains are done, then these messages are the same.
-            return 0 /* EqualTo */;
-        }
-        // We still have one chain remaining.  The shorter chain should come first.
-        return text1 ? 1 /* GreaterThan */ : -1 /* LessThan */;
-    }
-    function getEmitScriptTarget(compilerOptions) {
-        return compilerOptions.target || 0 /* ES3 */;
-    }
-    ts.getEmitScriptTarget = getEmitScriptTarget;
-    function getEmitModuleKind(compilerOptions) {
-        return typeof compilerOptions.module === "number" ?
-            compilerOptions.module :
-            getEmitScriptTarget(compilerOptions) >= 2 /* ES2015 */ ? ts.ModuleKind.ES2015 : ts.ModuleKind.CommonJS;
-    }
-    ts.getEmitModuleKind = getEmitModuleKind;
-    function getEmitModuleResolutionKind(compilerOptions) {
-        var moduleResolution = compilerOptions.moduleResolution;
-        if (moduleResolution === undefined) {
-            moduleResolution = getEmitModuleKind(compilerOptions) === ts.ModuleKind.CommonJS ? ts.ModuleResolutionKind.NodeJs : ts.ModuleResolutionKind.Classic;
-        }
-        return moduleResolution;
-    }
-    ts.getEmitModuleResolutionKind = getEmitModuleResolutionKind;
-    function unreachableCodeIsError(options) {
-        return options.allowUnreachableCode === false;
-    }
-    ts.unreachableCodeIsError = unreachableCodeIsError;
-    function unusedLabelIsError(options) {
-        return options.allowUnusedLabels === false;
-    }
-    ts.unusedLabelIsError = unusedLabelIsError;
-    function getAreDeclarationMapsEnabled(options) {
-        return !!(options.declaration && options.declarationMap);
-    }
-    ts.getAreDeclarationMapsEnabled = getAreDeclarationMapsEnabled;
-    function getAllowSyntheticDefaultImports(compilerOptions) {
-        var moduleKind = getEmitModuleKind(compilerOptions);
-        return compilerOptions.allowSyntheticDefaultImports !== undefined
-            ? compilerOptions.allowSyntheticDefaultImports
-            : compilerOptions.esModuleInterop
-                ? moduleKind !== ts.ModuleKind.None && moduleKind < ts.ModuleKind.ES2015
-                : moduleKind === ts.ModuleKind.System;
-    }
-    ts.getAllowSyntheticDefaultImports = getAllowSyntheticDefaultImports;
-    function getEmitDeclarations(compilerOptions) {
-        return !!(compilerOptions.declaration || compilerOptions.composite);
-    }
-    ts.getEmitDeclarations = getEmitDeclarations;
-    function getStrictOptionValue(compilerOptions, flag) {
-        return compilerOptions[flag] === undefined ? !!compilerOptions.strict : !!compilerOptions[flag];
-    }
-    ts.getStrictOptionValue = getStrictOptionValue;
-    function hasZeroOrOneAsteriskCharacter(str) {
-        var seenAsterisk = false;
-        for (var i = 0; i < str.length; i++) {
-            if (str.charCodeAt(i) === 42 /* asterisk */) {
-                if (!seenAsterisk) {
-                    seenAsterisk = true;
-                }
-                else {
-                    // have already seen asterisk
-                    return false;
-                }
-            }
-        }
-        return true;
-    }
-    ts.hasZeroOrOneAsteriskCharacter = hasZeroOrOneAsteriskCharacter;
-    //
-    // Paths
-    //
-    /**
-     * Internally, we represent paths as strings with '/' as the directory separator.
-     * When we make system calls (eg: LanguageServiceHost.getDirectory()),
-     * we expect the host to correctly handle paths in our specified format.
-     */
-    ts.directorySeparator = "/";
-    var altDirectorySeparator = "\\";
-    var urlSchemeSeparator = "://";
-    var backslashRegExp = /\\/g;
-    /**
-     * Normalize path separators.
-     */
-    function normalizeSlashes(path) {
-        return path.replace(backslashRegExp, ts.directorySeparator);
-    }
-    ts.normalizeSlashes = normalizeSlashes;
-    function isVolumeCharacter(charCode) {
-        return (charCode >= 97 /* a */ && charCode <= 122 /* z */) ||
-            (charCode >= 65 /* A */ && charCode <= 90 /* Z */);
-    }
-    function getFileUrlVolumeSeparatorEnd(url, start) {
-        var ch0 = url.charCodeAt(start);
-        if (ch0 === 58 /* colon */)
-            return start + 1;
-        if (ch0 === 37 /* percent */ && url.charCodeAt(start + 1) === 51 /* _3 */) {
-            var ch2 = url.charCodeAt(start + 2);
-            if (ch2 === 97 /* a */ || ch2 === 65 /* A */)
-                return start + 3;
-        }
-        return -1;
-    }
-    /**
-     * Returns length of the root part of a path or URL (i.e. length of "/", "x:/", "//server/share/, file:///user/files").
-     * If the root is part of a URL, the twos-complement of the root length is returned.
-     */
-    function getEncodedRootLength(path) {
-        if (!path)
-            return 0;
-        var ch0 = path.charCodeAt(0);
-        // POSIX or UNC
-        if (ch0 === 47 /* slash */ || ch0 === 92 /* backslash */) {
-            if (path.charCodeAt(1) !== ch0)
-                return 1; // POSIX: "/" (or non-normalized "\")
-            var p1 = path.indexOf(ch0 === 47 /* slash */ ? ts.directorySeparator : altDirectorySeparator, 2);
-            if (p1 < 0)
-                return path.length; // UNC: "//server" or "\\server"
-            return p1 + 1; // UNC: "//server/" or "\\server\"
-        }
-        // DOS
-        if (isVolumeCharacter(ch0) && path.charCodeAt(1) === 58 /* colon */) {
-            var ch2 = path.charCodeAt(2);
-            if (ch2 === 47 /* slash */ || ch2 === 92 /* backslash */)
-                return 3; // DOS: "c:/" or "c:\"
-            if (path.length === 2)
-                return 2; // DOS: "c:" (but not "c:d")
-        }
-        // URL
-        var schemeEnd = path.indexOf(urlSchemeSeparator);
-        if (schemeEnd !== -1) {
-            var authorityStart = schemeEnd + urlSchemeSeparator.length;
-            var authorityEnd = path.indexOf(ts.directorySeparator, authorityStart);
-            if (authorityEnd !== -1) { // URL: "file:///", "file://server/", "file://server/path"
-                // For local "file" URLs, include the leading DOS volume (if present).
-                // Per https://www.ietf.org/rfc/rfc1738.txt, a host of "" or "localhost" is a
-                // special case interpreted as "the machine from which the URL is being interpreted".
-                var scheme = path.slice(0, schemeEnd);
-                var authority = path.slice(authorityStart, authorityEnd);
-                if (scheme === "file" && (authority === "" || authority === "localhost") &&
-                    isVolumeCharacter(path.charCodeAt(authorityEnd + 1))) {
-                    var volumeSeparatorEnd = getFileUrlVolumeSeparatorEnd(path, authorityEnd + 2);
-                    if (volumeSeparatorEnd !== -1) {
-                        if (path.charCodeAt(volumeSeparatorEnd) === 47 /* slash */) {
-                            // URL: "file:///c:/", "file://localhost/c:/", "file:///c%3a/", "file://localhost/c%3a/"
-                            return ~(volumeSeparatorEnd + 1);
-                        }
-                        if (volumeSeparatorEnd === path.length) {
-                            // URL: "file:///c:", "file://localhost/c:", "file:///c$3a", "file://localhost/c%3a"
-                            // but not "file:///c:d" or "file:///c%3ad"
-                            return ~volumeSeparatorEnd;
-                        }
-                    }
-                }
-                return ~(authorityEnd + 1); // URL: "file://server/", "http://server/"
-            }
-            return ~path.length; // URL: "file://server", "http://server"
-        }
-        // relative
-        return 0;
-    }
-    /**
-     * Returns length of the root part of a path or URL (i.e. length of "/", "x:/", "//server/share/, file:///user/files").
-     *
-     * For example:
-     * ```ts
-     * getRootLength("a") === 0                   // ""
-     * getRootLength("/") === 1                   // "/"
-     * getRootLength("c:") === 2                  // "c:"
-     * getRootLength("c:d") === 0                 // ""
-     * getRootLength("c:/") === 3                 // "c:/"
-     * getRootLength("c:\\") === 3                // "c:\\"
-     * getRootLength("//server") === 7            // "//server"
-     * getRootLength("//server/share") === 8      // "//server/"
-     * getRootLength("\\\\server") === 7          // "\\\\server"
-     * getRootLength("\\\\server\\share") === 8   // "\\\\server\\"
-     * getRootLength("file:///path") === 8        // "file:///"
-     * getRootLength("file:///c:") === 10         // "file:///c:"
-     * getRootLength("file:///c:d") === 8         // "file:///"
-     * getRootLength("file:///c:/path") === 11    // "file:///c:/"
-     * getRootLength("file://server") === 13      // "file://server"
-     * getRootLength("file://server/path") === 14 // "file://server/"
-     * getRootLength("http://server") === 13      // "http://server"
-     * getRootLength("http://server/path") === 14 // "http://server/"
-     * ```
-     */
-    function getRootLength(path) {
-        var rootLength = getEncodedRootLength(path);
-        return rootLength < 0 ? ~rootLength : rootLength;
-    }
-    ts.getRootLength = getRootLength;
-    // TODO(rbuckton): replace references with `resolvePath`
-    function normalizePath(path) {
-        return resolvePath(path);
-    }
-    ts.normalizePath = normalizePath;
-    function normalizePathAndParts(path) {
-        path = normalizeSlashes(path);
-        var _a = reducePathComponents(getPathComponents(path)), root = _a[0], parts = _a.slice(1);
-        if (parts.length) {
-            var joinedParts = root + parts.join(ts.directorySeparator);
-            return { path: hasTrailingDirectorySeparator(path) ? ensureTrailingDirectorySeparator(joinedParts) : joinedParts, parts: parts };
-        }
-        else {
-            return { path: root, parts: parts };
-        }
-    }
-    ts.normalizePathAndParts = normalizePathAndParts;
-    function getDirectoryPath(path) {
-        path = normalizeSlashes(path);
-        // If the path provided is itself the root, then return it.
-        var rootLength = getRootLength(path);
-        if (rootLength === path.length)
-            return path;
-        // return the leading portion of the path up to the last (non-terminal) directory separator
-        // but not including any trailing directory separator.
-        path = removeTrailingDirectorySeparator(path);
-        return path.slice(0, Math.max(rootLength, path.lastIndexOf(ts.directorySeparator)));
-    }
-    ts.getDirectoryPath = getDirectoryPath;
-    function isUrl(path) {
-        return getEncodedRootLength(path) < 0;
-    }
-    ts.isUrl = isUrl;
-    function pathIsRelative(path) {
-        return /^\.\.?($|[\\/])/.test(path);
-    }
-    ts.pathIsRelative = pathIsRelative;
-    /**
-     * Determines whether a path is an absolute path (e.g. starts with `/`, or a dos path
-     * like `c:`, `c:\` or `c:/`).
-     */
-    function isRootedDiskPath(path) {
-        return getEncodedRootLength(path) > 0;
-    }
-    ts.isRootedDiskPath = isRootedDiskPath;
-    /**
-     * Determines whether a path consists only of a path root.
-     */
-    function isDiskPathRoot(path) {
-        var rootLength = getEncodedRootLength(path);
-        return rootLength > 0 && rootLength === path.length;
-    }
-    ts.isDiskPathRoot = isDiskPathRoot;
-    function convertToRelativePath(absoluteOrRelativePath, basePath, getCanonicalFileName) {
-        return !isRootedDiskPath(absoluteOrRelativePath)
-            ? absoluteOrRelativePath
-            : getRelativePathToDirectoryOrUrl(basePath, absoluteOrRelativePath, basePath, getCanonicalFileName, /*isAbsolutePathAnUrl*/ false);
-    }
-    ts.convertToRelativePath = convertToRelativePath;
-    function pathComponents(path, rootLength) {
-        var root = path.substring(0, rootLength);
-        var rest = path.substring(rootLength).split(ts.directorySeparator);
-        if (rest.length && !lastOrUndefined(rest))
-            rest.pop();
-        return [root].concat(rest);
-    }
-    /**
-     * Parse a path into an array containing a root component (at index 0) and zero or more path
-     * components (at indices > 0). The result is not normalized.
-     * If the path is relative, the root component is `""`.
-     * If the path is absolute, the root component includes the first path separator (`/`).
-     */
-    function getPathComponents(path, currentDirectory) {
-        if (currentDirectory === void 0) { currentDirectory = ""; }
-        path = combinePaths(currentDirectory, path);
-        var rootLength = getRootLength(path);
-        return pathComponents(path, rootLength);
-    }
-    ts.getPathComponents = getPathComponents;
-    /**
-     * Reduce an array of path components to a more simplified path by navigating any
-     * `"."` or `".."` entries in the path.
-     */
-    function reducePathComponents(components) {
-        if (!some(components))
-            return [];
-        var reduced = [components[0]];
-        for (var i = 1; i < components.length; i++) {
-            var component = components[i];
-            if (!component)
-                continue;
-            if (component === ".")
-                continue;
-            if (component === "..") {
-                if (reduced.length > 1) {
-                    if (reduced[reduced.length - 1] !== "..") {
-                        reduced.pop();
-                        continue;
-                    }
-                }
-                else if (reduced[0])
-                    continue;
-            }
-            reduced.push(component);
-        }
-        return reduced;
-    }
-    ts.reducePathComponents = reducePathComponents;
-    /**
-     * Parse a path into an array containing a root component (at index 0) and zero or more path
-     * components (at indices > 0). The result is normalized.
-     * If the path is relative, the root component is `""`.
-     * If the path is absolute, the root component includes the first path separator (`/`).
-     */
-    function getNormalizedPathComponents(path, currentDirectory) {
-        return reducePathComponents(getPathComponents(path, currentDirectory));
-    }
-    ts.getNormalizedPathComponents = getNormalizedPathComponents;
-    function getNormalizedAbsolutePath(fileName, currentDirectory) {
-        return getPathFromPathComponents(getNormalizedPathComponents(fileName, currentDirectory));
-    }
-    ts.getNormalizedAbsolutePath = getNormalizedAbsolutePath;
-    /**
-     * Formats a parsed path consisting of a root component (at index 0) and zero or more path
-     * segments (at indices > 0).
-     */
-    function getPathFromPathComponents(pathComponents) {
-        if (pathComponents.length === 0)
-            return "";
-        var root = pathComponents[0] && ensureTrailingDirectorySeparator(pathComponents[0]);
-        if (pathComponents.length === 1)
-            return root;
-        return root + pathComponents.slice(1).join(ts.directorySeparator);
-    }
-    ts.getPathFromPathComponents = getPathFromPathComponents;
-    function getPathComponentsRelativeTo(from, to, stringEqualityComparer, getCanonicalFileName) {
-        var fromComponents = reducePathComponents(getPathComponents(from));
-        var toComponents = reducePathComponents(getPathComponents(to));
-        var start;
-        for (start = 0; start < fromComponents.length && start < toComponents.length; start++) {
-            var fromComponent = getCanonicalFileName(fromComponents[start]);
-            var toComponent = getCanonicalFileName(toComponents[start]);
-            var comparer = start === 0 ? equateStringsCaseInsensitive : stringEqualityComparer;
-            if (!comparer(fromComponent, toComponent))
-                break;
-        }
-        if (start === 0) {
-            return toComponents;
-        }
-        var components = toComponents.slice(start);
-        var relative = [];
-        for (; start < fromComponents.length; start++) {
-            relative.push("..");
-        }
-        return [""].concat(relative, components);
-    }
-    function getRelativePathFromFile(from, to, getCanonicalFileName) {
-        return ensurePathIsNonModuleName(getRelativePathFromDirectory(getDirectoryPath(from), to, getCanonicalFileName));
-    }
-    ts.getRelativePathFromFile = getRelativePathFromFile;
-    function getRelativePathFromDirectory(fromDirectory, to, getCanonicalFileNameOrIgnoreCase) {
-        Debug.assert((getRootLength(fromDirectory) > 0) === (getRootLength(to) > 0), "Paths must either both be absolute or both be relative");
-        var getCanonicalFileName = typeof getCanonicalFileNameOrIgnoreCase === "function" ? getCanonicalFileNameOrIgnoreCase : identity;
-        var ignoreCase = typeof getCanonicalFileNameOrIgnoreCase === "boolean" ? getCanonicalFileNameOrIgnoreCase : false;
-        var pathComponents = getPathComponentsRelativeTo(fromDirectory, to, ignoreCase ? equateStringsCaseInsensitive : equateStringsCaseSensitive, getCanonicalFileName);
-        return getPathFromPathComponents(pathComponents);
-    }
-    ts.getRelativePathFromDirectory = getRelativePathFromDirectory;
-    function getRelativePathToDirectoryOrUrl(directoryPathOrUrl, relativeOrAbsolutePath, currentDirectory, getCanonicalFileName, isAbsolutePathAnUrl) {
-        var pathComponents = getPathComponentsRelativeTo(resolvePath(currentDirectory, directoryPathOrUrl), resolvePath(currentDirectory, relativeOrAbsolutePath), equateStringsCaseSensitive, getCanonicalFileName);
-        var firstComponent = pathComponents[0];
-        if (isAbsolutePathAnUrl && isRootedDiskPath(firstComponent)) {
-            var prefix = firstComponent.charAt(0) === ts.directorySeparator ? "file://" : "file:///";
-            pathComponents[0] = prefix + firstComponent;
-        }
-        return getPathFromPathComponents(pathComponents);
-    }
-    ts.getRelativePathToDirectoryOrUrl = getRelativePathToDirectoryOrUrl;
-    /**
-     * Ensures a path is either absolute (prefixed with `/` or `c:`) or dot-relative (prefixed
-     * with `./` or `../`) so as not to be confused with an unprefixed module name.
-     */
-    function ensurePathIsNonModuleName(path) {
-        return getRootLength(path) === 0 && !pathIsRelative(path) ? "./" + path : path;
-    }
-    ts.ensurePathIsNonModuleName = ensurePathIsNonModuleName;
-    function getBaseFileName(path, extensions, ignoreCase) {
-        path = normalizeSlashes(path);
-        // if the path provided is itself the root, then it has not file name.
-        var rootLength = getRootLength(path);
-        if (rootLength === path.length)
-            return "";
-        // return the trailing portion of the path starting after the last (non-terminal) directory
-        // separator but not including any trailing directory separator.
-        path = removeTrailingDirectorySeparator(path);
-        var name = path.slice(Math.max(getRootLength(path), path.lastIndexOf(ts.directorySeparator) + 1));
-        var extension = extensions !== undefined && ignoreCase !== undefined ? getAnyExtensionFromPath(name, extensions, ignoreCase) : undefined;
-        return extension ? name.slice(0, name.length - extension.length) : name;
-    }
-    ts.getBaseFileName = getBaseFileName;
-    /**
-     * Combines paths. If a path is absolute, it replaces any previous path.
-     */
-    function combinePaths(path) {
-        var paths = [];
-        for (var _i = 1; _i < arguments.length; _i++) {
-            paths[_i - 1] = arguments[_i];
-        }
-        if (path)
-            path = normalizeSlashes(path);
-        for (var _a = 0, paths_1 = paths; _a < paths_1.length; _a++) {
-            var relativePath = paths_1[_a];
-            if (!relativePath)
-                continue;
-            relativePath = normalizeSlashes(relativePath);
-            if (!path || getRootLength(relativePath) !== 0) {
-                path = relativePath;
-            }
-            else {
-                path = ensureTrailingDirectorySeparator(path) + relativePath;
-            }
-        }
-        return path;
-    }
-    ts.combinePaths = combinePaths;
-    /**
-     * Combines and resolves paths. If a path is absolute, it replaces any previous path. Any
-     * `.` and `..` path components are resolved.
-     */
-    function resolvePath(path) {
-        var paths = [];
-        for (var _i = 1; _i < arguments.length; _i++) {
-            paths[_i - 1] = arguments[_i];
-        }
-        var combined = some(paths) ? combinePaths.apply(void 0, [path].concat(paths)) : normalizeSlashes(path);
-        var normalized = getPathFromPathComponents(reducePathComponents(getPathComponents(combined)));
-        return normalized && hasTrailingDirectorySeparator(combined) ? ensureTrailingDirectorySeparator(normalized) : normalized;
-    }
-    ts.resolvePath = resolvePath;
-    /**
-     * Determines whether a path has a trailing separator (`/` or `\\`).
-     */
-    function hasTrailingDirectorySeparator(path) {
-        if (path.length === 0)
-            return false;
-        var ch = path.charCodeAt(path.length - 1);
-        return ch === 47 /* slash */ || ch === 92 /* backslash */;
-    }
-    ts.hasTrailingDirectorySeparator = hasTrailingDirectorySeparator;
-    function removeTrailingDirectorySeparator(path) {
-        if (hasTrailingDirectorySeparator(path)) {
-            return path.substr(0, path.length - 1);
-        }
-        return path;
-    }
-    ts.removeTrailingDirectorySeparator = removeTrailingDirectorySeparator;
-    function ensureTrailingDirectorySeparator(path) {
-        if (!hasTrailingDirectorySeparator(path)) {
-            return path + ts.directorySeparator;
-        }
-        return path;
-    }
-    ts.ensureTrailingDirectorySeparator = ensureTrailingDirectorySeparator;
-    function comparePathsWorker(a, b, componentComparer) {
-        if (a === b)
-            return 0 /* EqualTo */;
-        if (a === undefined)
-            return -1 /* LessThan */;
-        if (b === undefined)
-            return 1 /* GreaterThan */;
-        var aComponents = reducePathComponents(getPathComponents(a));
-        var bComponents = reducePathComponents(getPathComponents(b));
-        var sharedLength = Math.min(aComponents.length, bComponents.length);
-        for (var i = 0; i < sharedLength; i++) {
-            var stringComparer = i === 0 ? compareStringsCaseInsensitive : componentComparer;
-            var result = stringComparer(aComponents[i], bComponents[i]);
-            if (result !== 0 /* EqualTo */) {
-                return result;
-            }
-        }
-        return compareValues(aComponents.length, bComponents.length);
-    }
-    /**
-     * Performs a case-sensitive comparison of two paths.
-     */
-    function comparePathsCaseSensitive(a, b) {
-        return comparePathsWorker(a, b, compareStringsCaseSensitive);
-    }
-    ts.comparePathsCaseSensitive = comparePathsCaseSensitive;
-    /**
-     * Performs a case-insensitive comparison of two paths.
-     */
-    function comparePathsCaseInsensitive(a, b) {
-        return comparePathsWorker(a, b, compareStringsCaseInsensitive);
-    }
-    ts.comparePathsCaseInsensitive = comparePathsCaseInsensitive;
-    function comparePaths(a, b, currentDirectory, ignoreCase) {
-        if (typeof currentDirectory === "string") {
-            a = combinePaths(currentDirectory, a);
-            b = combinePaths(currentDirectory, b);
-        }
-        else if (typeof currentDirectory === "boolean") {
-            ignoreCase = currentDirectory;
-        }
-        return comparePathsWorker(a, b, getStringComparer(ignoreCase));
-    }
-    ts.comparePaths = comparePaths;
-    function containsPath(parent, child, currentDirectory, ignoreCase) {
-        if (typeof currentDirectory === "string") {
-            parent = combinePaths(currentDirectory, parent);
-            child = combinePaths(currentDirectory, child);
-        }
-        else if (typeof currentDirectory === "boolean") {
-            ignoreCase = currentDirectory;
-        }
-        if (parent === undefined || child === undefined)
-            return false;
-        if (parent === child)
-            return true;
-        var parentComponents = reducePathComponents(getPathComponents(parent));
-        var childComponents = reducePathComponents(getPathComponents(child));
-        if (childComponents.length < parentComponents.length) {
-            return false;
-        }
-        var componentEqualityComparer = ignoreCase ? equateStringsCaseInsensitive : equateStringsCaseSensitive;
-        for (var i = 0; i < parentComponents.length; i++) {
-            var equalityComparer = i === 0 ? equateStringsCaseInsensitive : componentEqualityComparer;
-            if (!equalityComparer(parentComponents[i], childComponents[i])) {
-                return false;
-            }
-        }
-        return true;
-    }
-    ts.containsPath = containsPath;
-    function startsWith(str, prefix) {
-        return str.lastIndexOf(prefix, 0) === 0;
-    }
-    ts.startsWith = startsWith;
-    function removePrefix(str, prefix) {
-        return startsWith(str, prefix) ? str.substr(prefix.length) : str;
-    }
-    ts.removePrefix = removePrefix;
-    function tryRemovePrefix(str, prefix) {
-        return startsWith(str, prefix) ? str.substring(prefix.length) : undefined;
-    }
-    ts.tryRemovePrefix = tryRemovePrefix;
-    function tryRemoveDirectoryPrefix(path, dirPath) {
-        var a = tryRemovePrefix(path, dirPath);
-        if (a === undefined)
-            return undefined;
-        switch (a.charCodeAt(0)) {
-            case 47 /* slash */:
-            case 92 /* backslash */:
-                return a.slice(1);
-            default:
-                return undefined;
-        }
-    }
-    ts.tryRemoveDirectoryPrefix = tryRemoveDirectoryPrefix;
-    function endsWith(str, suffix) {
-        var expectedPos = str.length - suffix.length;
-        return expectedPos >= 0 && str.indexOf(suffix, expectedPos) === expectedPos;
-    }
-    ts.endsWith = endsWith;
-    function removeSuffix(str, suffix) {
-        return endsWith(str, suffix) ? str.slice(0, str.length - suffix.length) : str;
-    }
-    ts.removeSuffix = removeSuffix;
-    function tryRemoveSuffix(str, suffix) {
-        return endsWith(str, suffix) ? str.slice(0, str.length - suffix.length) : undefined;
-    }
-    ts.tryRemoveSuffix = tryRemoveSuffix;
-    function stringContains(str, substring) {
-        return str.indexOf(substring) !== -1;
-    }
-    ts.stringContains = stringContains;
-    function hasExtension(fileName) {
-        return stringContains(getBaseFileName(fileName), ".");
-    }
-    ts.hasExtension = hasExtension;
-    function fileExtensionIs(path, extension) {
-        return path.length > extension.length && endsWith(path, extension);
-    }
-    ts.fileExtensionIs = fileExtensionIs;
-    function fileExtensionIsOneOf(path, extensions) {
-        for (var _i = 0, extensions_1 = extensions; _i < extensions_1.length; _i++) {
-            var extension = extensions_1[_i];
-            if (fileExtensionIs(path, extension)) {
-                return true;
-            }
-        }
-        return false;
-    }
-    ts.fileExtensionIsOneOf = fileExtensionIsOneOf;
-    // Reserved characters, forces escaping of any non-word (or digit), non-whitespace character.
-    // It may be inefficient (we could just match (/[-[\]{}()*+?.,\\^$|#\s]/g), but this is future
-    // proof.
-    var reservedCharacterPattern = /[^\w\s\/]/g;
-    var wildcardCharCodes = [42 /* asterisk */, 63 /* question */];
-    ts.commonPackageFolders = ["node_modules", "bower_components", "jspm_packages"];
-    var implicitExcludePathRegexPattern = "(?!(" + ts.commonPackageFolders.join("|") + ")(/|$))";
-    var filesMatcher = {
-        /**
-         * Matches any single directory segment unless it is the last segment and a .min.js file
-         * Breakdown:
-         *  [^./]                   # matches everything up to the first . character (excluding directory separators)
-         *  (\\.(?!min\\.js$))?     # matches . characters but not if they are part of the .min.js file extension
-         */
-        singleAsteriskRegexFragment: "([^./]|(\\.(?!min\\.js$))?)*",
-        /**
-         * Regex for the ** wildcard. Matches any number of subdirectories. When used for including
-         * files or directories, does not match subdirectories that start with a . character
-         */
-        doubleAsteriskRegexFragment: "(/" + implicitExcludePathRegexPattern + "[^/.][^/]*)*?",
-        replaceWildcardCharacter: function (match) { return replaceWildcardCharacter(match, filesMatcher.singleAsteriskRegexFragment); }
-    };
-    var directoriesMatcher = {
-        singleAsteriskRegexFragment: "[^/]*",
-        /**
-         * Regex for the ** wildcard. Matches any number of subdirectories. When used for including
-         * files or directories, does not match subdirectories that start with a . character
-         */
-        doubleAsteriskRegexFragment: "(/" + implicitExcludePathRegexPattern + "[^/.][^/]*)*?",
-        replaceWildcardCharacter: function (match) { return replaceWildcardCharacter(match, directoriesMatcher.singleAsteriskRegexFragment); }
-    };
-    var excludeMatcher = {
-        singleAsteriskRegexFragment: "[^/]*",
-        doubleAsteriskRegexFragment: "(/.+?)?",
-        replaceWildcardCharacter: function (match) { return replaceWildcardCharacter(match, excludeMatcher.singleAsteriskRegexFragment); }
-    };
-    var wildcardMatchers = {
-        files: filesMatcher,
-        directories: directoriesMatcher,
-        exclude: excludeMatcher
-    };
-    function getRegularExpressionForWildcard(specs, basePath, usage) {
-        var patterns = getRegularExpressionsForWildcards(specs, basePath, usage);
-        if (!patterns || !patterns.length) {
-            return undefined;
-        }
-        var pattern = patterns.map(function (pattern) { return "(" + pattern + ")"; }).join("|");
-        // If excluding, match "foo/bar/baz...", but if including, only allow "foo".
-        var terminator = usage === "exclude" ? "($|/)" : "$";
-        return "^(" + pattern + ")" + terminator;
-    }
-    ts.getRegularExpressionForWildcard = getRegularExpressionForWildcard;
-    function getRegularExpressionsForWildcards(specs, basePath, usage) {
-        if (specs === undefined || specs.length === 0) {
-            return undefined;
-        }
-        return flatMap(specs, function (spec) {
-            return spec && getSubPatternFromSpec(spec, basePath, usage, wildcardMatchers[usage]);
-        });
-    }
-    /**
-     * An "includes" path "foo" is implicitly a glob "foo/** /*" (without the space) if its last component has no extension,
-     * and does not contain any glob characters itself.
-     */
-    function isImplicitGlob(lastPathComponent) {
-        return !/[.*?]/.test(lastPathComponent);
-    }
-    ts.isImplicitGlob = isImplicitGlob;
-    function getSubPatternFromSpec(spec, basePath, usage, _a) {
-        var singleAsteriskRegexFragment = _a.singleAsteriskRegexFragment, doubleAsteriskRegexFragment = _a.doubleAsteriskRegexFragment, replaceWildcardCharacter = _a.replaceWildcardCharacter;
-        var subpattern = "";
-        var hasWrittenComponent = false;
-        var components = getNormalizedPathComponents(spec, basePath);
-        var lastComponent = last(components);
-        if (usage !== "exclude" && lastComponent === "**") {
-            return undefined;
-        }
-        // getNormalizedPathComponents includes the separator for the root component.
-        // We need to remove to create our regex correctly.
-        components[0] = removeTrailingDirectorySeparator(components[0]);
-        if (isImplicitGlob(lastComponent)) {
-            components.push("**", "*");
-        }
-        var optionalCount = 0;
-        for (var _i = 0, components_1 = components; _i < components_1.length; _i++) {
-            var component = components_1[_i];
-            if (component === "**") {
-                subpattern += doubleAsteriskRegexFragment;
-            }
-            else {
-                if (usage === "directories") {
-                    subpattern += "(";
-                    optionalCount++;
-                }
-                if (hasWrittenComponent) {
-                    subpattern += ts.directorySeparator;
-                }
-                if (usage !== "exclude") {
-                    var componentPattern = "";
-                    // The * and ? wildcards should not match directories or files that start with . if they
-                    // appear first in a component. Dotted directories and files can be included explicitly
-                    // like so: **/.*/.*
-                    if (component.charCodeAt(0) === 42 /* asterisk */) {
-                        componentPattern += "([^./]" + singleAsteriskRegexFragment + ")?";
-                        component = component.substr(1);
-                    }
-                    else if (component.charCodeAt(0) === 63 /* question */) {
-                        componentPattern += "[^./]";
-                        component = component.substr(1);
-                    }
-                    componentPattern += component.replace(reservedCharacterPattern, replaceWildcardCharacter);
-                    // Patterns should not include subfolders like node_modules unless they are
-                    // explicitly included as part of the path.
-                    //
-                    // As an optimization, if the component pattern is the same as the component,
-                    // then there definitely were no wildcard characters and we do not need to
-                    // add the exclusion pattern.
-                    if (componentPattern !== component) {
-                        subpattern += implicitExcludePathRegexPattern;
-                    }
-                    subpattern += componentPattern;
-                }
-                else {
-                    subpattern += component.replace(reservedCharacterPattern, replaceWildcardCharacter);
-                }
-            }
-            hasWrittenComponent = true;
-        }
-        while (optionalCount > 0) {
-            subpattern += ")?";
-            optionalCount--;
-        }
-        return subpattern;
-    }
-    function replaceWildcardCharacter(match, singleAsteriskRegexFragment) {
-        return match === "*" ? singleAsteriskRegexFragment : match === "?" ? "[^/]" : "\\" + match;
-    }
-    /** @param path directory of the tsconfig.json */
-    function getFileMatcherPatterns(path, excludes, includes, useCaseSensitiveFileNames, currentDirectory) {
-        path = normalizePath(path);
-        currentDirectory = normalizePath(currentDirectory);
-        var absolutePath = combinePaths(currentDirectory, path);
-        return {
-            includeFilePatterns: map(getRegularExpressionsForWildcards(includes, absolutePath, "files"), function (pattern) { return "^" + pattern + "$"; }),
-            includeFilePattern: getRegularExpressionForWildcard(includes, absolutePath, "files"),
-            includeDirectoryPattern: getRegularExpressionForWildcard(includes, absolutePath, "directories"),
-            excludePattern: getRegularExpressionForWildcard(excludes, absolutePath, "exclude"),
-            basePaths: getBasePaths(path, includes, useCaseSensitiveFileNames)
-        };
-    }
-    ts.getFileMatcherPatterns = getFileMatcherPatterns;
-    function getRegexFromPattern(pattern, useCaseSensitiveFileNames) {
-        return new RegExp(pattern, useCaseSensitiveFileNames ? "" : "i");
-    }
-    ts.getRegexFromPattern = getRegexFromPattern;
-    /** @param path directory of the tsconfig.json */
-    function matchFiles(path, extensions, excludes, includes, useCaseSensitiveFileNames, currentDirectory, depth, getFileSystemEntries) {
-        path = normalizePath(path);
-        currentDirectory = normalizePath(currentDirectory);
-        var patterns = getFileMatcherPatterns(path, excludes, includes, useCaseSensitiveFileNames, currentDirectory);
-        var includeFileRegexes = patterns.includeFilePatterns && patterns.includeFilePatterns.map(function (pattern) { return getRegexFromPattern(pattern, useCaseSensitiveFileNames); });
-        var includeDirectoryRegex = patterns.includeDirectoryPattern && getRegexFromPattern(patterns.includeDirectoryPattern, useCaseSensitiveFileNames);
-        var excludeRegex = patterns.excludePattern && getRegexFromPattern(patterns.excludePattern, useCaseSensitiveFileNames);
-        // Associate an array of results with each include regex. This keeps results in order of the "include" order.
-        // If there are no "includes", then just put everything in results[0].
-        var results = includeFileRegexes ? includeFileRegexes.map(function () { return []; }) : [[]];
-        for (var _i = 0, _a = patterns.basePaths; _i < _a.length; _i++) {
-            var basePath = _a[_i];
-            visitDirectory(basePath, combinePaths(currentDirectory, basePath), depth);
-        }
-        return flatten(results);
-        function visitDirectory(path, absolutePath, depth) {
-            var _a = getFileSystemEntries(path), files = _a.files, directories = _a.directories;
-            var _loop_1 = function (current) {
-                var name = combinePaths(path, current);
-                var absoluteName = combinePaths(absolutePath, current);
-                if (extensions && !fileExtensionIsOneOf(name, extensions))
-                    return "continue";
-                if (excludeRegex && excludeRegex.test(absoluteName))
-                    return "continue";
-                if (!includeFileRegexes) {
-                    results[0].push(name);
-                }
-                else {
-                    var includeIndex = findIndex(includeFileRegexes, function (re) { return re.test(absoluteName); });
-                    if (includeIndex !== -1) {
-                        results[includeIndex].push(name);
-                    }
-                }
-            };
-            for (var _i = 0, _b = sort(files, compareStringsCaseSensitive); _i < _b.length; _i++) {
-                var current = _b[_i];
-                _loop_1(current);
-            }
-            if (depth !== undefined) {
-                depth--;
-                if (depth === 0) {
-                    return;
-                }
-            }
-            for (var _c = 0, _d = sort(directories, compareStringsCaseSensitive); _c < _d.length; _c++) {
-                var current = _d[_c];
-                var name = combinePaths(path, current);
-                var absoluteName = combinePaths(absolutePath, current);
-                if ((!includeDirectoryRegex || includeDirectoryRegex.test(absoluteName)) &&
-                    (!excludeRegex || !excludeRegex.test(absoluteName))) {
-                    visitDirectory(name, absoluteName, depth);
-                }
-            }
-        }
-    }
-    ts.matchFiles = matchFiles;
-    /**
-     * Computes the unique non-wildcard base paths amongst the provided include patterns.
-     */
-    function getBasePaths(path, includes, useCaseSensitiveFileNames) {
-        // Storage for our results in the form of literal paths (e.g. the paths as written by the user).
-        var basePaths = [path];
-        if (includes) {
-            // Storage for literal base paths amongst the include patterns.
-            var includeBasePaths = [];
-            for (var _i = 0, includes_1 = includes; _i < includes_1.length; _i++) {
-                var include = includes_1[_i];
-                // We also need to check the relative paths by converting them to absolute and normalizing
-                // in case they escape the base path (e.g "..\somedirectory")
-                var absolute = isRootedDiskPath(include) ? include : normalizePath(combinePaths(path, include));
-                // Append the literal and canonical candidate base paths.
-                includeBasePaths.push(getIncludeBasePath(absolute));
-            }
-            // Sort the offsets array using either the literal or canonical path representations.
-            includeBasePaths.sort(getStringComparer(!useCaseSensitiveFileNames));
-            var _loop_2 = function (includeBasePath) {
-                if (every(basePaths, function (basePath) { return !containsPath(basePath, includeBasePath, path, !useCaseSensitiveFileNames); })) {
-                    basePaths.push(includeBasePath);
-                }
-            };
-            // Iterate over each include base path and include unique base paths that are not a
-            // subpath of an existing base path
-            for (var _a = 0, includeBasePaths_1 = includeBasePaths; _a < includeBasePaths_1.length; _a++) {
-                var includeBasePath = includeBasePaths_1[_a];
-                _loop_2(includeBasePath);
-            }
-        }
-        return basePaths;
-    }
-    function getIncludeBasePath(absolute) {
-        var wildcardOffset = indexOfAnyCharCode(absolute, wildcardCharCodes);
-        if (wildcardOffset < 0) {
-            // No "*" or "?" in the path
-            return !hasExtension(absolute)
-                ? absolute
-                : removeTrailingDirectorySeparator(getDirectoryPath(absolute));
-        }
-        return absolute.substring(0, absolute.lastIndexOf(ts.directorySeparator, wildcardOffset));
-    }
-    function ensureScriptKind(fileName, scriptKind) {
-        // Using scriptKind as a condition handles both:
-        // - 'scriptKind' is unspecified and thus it is `undefined`
-        // - 'scriptKind' is set and it is `Unknown` (0)
-        // If the 'scriptKind' is 'undefined' or 'Unknown' then we attempt
-        // to get the ScriptKind from the file name. If it cannot be resolved
-        // from the file name then the default 'TS' script kind is returned.
-        return scriptKind || getScriptKindFromFileName(fileName) || 3 /* TS */;
-    }
-    ts.ensureScriptKind = ensureScriptKind;
-    function getScriptKindFromFileName(fileName) {
-        var ext = fileName.substr(fileName.lastIndexOf("."));
-        switch (ext.toLowerCase()) {
-            case ".js" /* Js */:
-                return 1 /* JS */;
-            case ".jsx" /* Jsx */:
-                return 2 /* JSX */;
-            case ".ts" /* Ts */:
-                return 3 /* TS */;
-            case ".tsx" /* Tsx */:
-                return 4 /* TSX */;
-            case ".json" /* Json */:
-                return 6 /* JSON */;
-            default:
-                return 0 /* Unknown */;
-        }
-    }
-    ts.getScriptKindFromFileName = getScriptKindFromFileName;
-    /**
-     *  List of supported extensions in order of file resolution precedence.
-     */
-    ts.supportedTypeScriptExtensions = [".ts" /* Ts */, ".tsx" /* Tsx */, ".d.ts" /* Dts */];
-    /** Must have ".d.ts" first because if ".ts" goes first, that will be detected as the extension instead of ".d.ts". */
-    ts.supportedTypescriptExtensionsForExtractExtension = [".d.ts" /* Dts */, ".ts" /* Ts */, ".tsx" /* Tsx */];
-    ts.supportedJavascriptExtensions = [".js" /* Js */, ".jsx" /* Jsx */];
-    var allSupportedExtensions = ts.supportedTypeScriptExtensions.concat(ts.supportedJavascriptExtensions);
-    function getSupportedExtensions(options, extraFileExtensions) {
-        var needJsExtensions = options && options.allowJs;
-        if (!extraFileExtensions || extraFileExtensions.length === 0) {
-            return needJsExtensions ? allSupportedExtensions : ts.supportedTypeScriptExtensions;
-        }
-        var extensions = (needJsExtensions ? allSupportedExtensions : ts.supportedTypeScriptExtensions).concat(mapDefined(extraFileExtensions, function (x) { return x.scriptKind === 7 /* Deferred */ || needJsExtensions && isJavaScriptLike(x.scriptKind) ? x.extension : undefined; }));
-        return deduplicate(extensions, equateStringsCaseSensitive, compareStringsCaseSensitive);
-    }
-    ts.getSupportedExtensions = getSupportedExtensions;
-    function isJavaScriptLike(scriptKind) {
-        return scriptKind === 1 /* JS */ || scriptKind === 2 /* JSX */;
-    }
-    function hasJavaScriptFileExtension(fileName) {
-        return some(ts.supportedJavascriptExtensions, function (extension) { return fileExtensionIs(fileName, extension); });
-    }
-    ts.hasJavaScriptFileExtension = hasJavaScriptFileExtension;
-    function hasTypeScriptFileExtension(fileName) {
-        return some(ts.supportedTypeScriptExtensions, function (extension) { return fileExtensionIs(fileName, extension); });
-    }
-    ts.hasTypeScriptFileExtension = hasTypeScriptFileExtension;
-    function isSupportedSourceFileName(fileName, compilerOptions, extraFileExtensions) {
-        if (!fileName) {
-            return false;
-        }
-        for (var _i = 0, _a = getSupportedExtensions(compilerOptions, extraFileExtensions); _i < _a.length; _i++) {
-            var extension = _a[_i];
-            if (fileExtensionIs(fileName, extension)) {
-                return true;
-            }
-        }
-        return false;
-    }
-    ts.isSupportedSourceFileName = isSupportedSourceFileName;
-    /**
-     * Extension boundaries by priority. Lower numbers indicate higher priorities, and are
-     * aligned to the offset of the highest priority extension in the
-     * allSupportedExtensions array.
-     */
-    var ExtensionPriority;
-    (function (ExtensionPriority) {
-        ExtensionPriority[ExtensionPriority["TypeScriptFiles"] = 0] = "TypeScriptFiles";
-        ExtensionPriority[ExtensionPriority["DeclarationAndJavaScriptFiles"] = 2] = "DeclarationAndJavaScriptFiles";
-        ExtensionPriority[ExtensionPriority["Highest"] = 0] = "Highest";
-        ExtensionPriority[ExtensionPriority["Lowest"] = 2] = "Lowest";
-    })(ExtensionPriority = ts.ExtensionPriority || (ts.ExtensionPriority = {}));
-    function getExtensionPriority(path, supportedExtensions) {
-        for (var i = supportedExtensions.length - 1; i >= 0; i--) {
-            if (fileExtensionIs(path, supportedExtensions[i])) {
-                return adjustExtensionPriority(i, supportedExtensions);
-            }
-        }
-        // If its not in the list of supported extensions, this is likely a
-        // TypeScript file with a non-ts extension
-        return 0 /* Highest */;
-    }
-    ts.getExtensionPriority = getExtensionPriority;
-    /**
-     * Adjusts an extension priority to be the highest priority within the same range.
-     */
-    function adjustExtensionPriority(extensionPriority, supportedExtensions) {
-        if (extensionPriority < 2 /* DeclarationAndJavaScriptFiles */) {
-            return 0 /* TypeScriptFiles */;
-        }
-        else if (extensionPriority < supportedExtensions.length) {
-            return 2 /* DeclarationAndJavaScriptFiles */;
-        }
-        else {
-            return supportedExtensions.length;
-        }
-    }
-    ts.adjustExtensionPriority = adjustExtensionPriority;
-    /**
-     * Gets the next lowest extension priority for a given priority.
-     */
-    function getNextLowestExtensionPriority(extensionPriority, supportedExtensions) {
-        if (extensionPriority < 2 /* DeclarationAndJavaScriptFiles */) {
-            return 2 /* DeclarationAndJavaScriptFiles */;
-        }
-        else {
-            return supportedExtensions.length;
-        }
-    }
-    ts.getNextLowestExtensionPriority = getNextLowestExtensionPriority;
-    var extensionsToRemove = [".d.ts" /* Dts */, ".ts" /* Ts */, ".js" /* Js */, ".tsx" /* Tsx */, ".jsx" /* Jsx */, ".json" /* Json */];
-    function removeFileExtension(path) {
-        for (var _i = 0, extensionsToRemove_1 = extensionsToRemove; _i < extensionsToRemove_1.length; _i++) {
-            var ext = extensionsToRemove_1[_i];
-            var extensionless = tryRemoveExtension(path, ext);
-            if (extensionless !== undefined) {
-                return extensionless;
-            }
-        }
-        return path;
-    }
-    ts.removeFileExtension = removeFileExtension;
-    function tryRemoveExtension(path, extension) {
-        return fileExtensionIs(path, extension) ? removeExtension(path, extension) : undefined;
-    }
-    ts.tryRemoveExtension = tryRemoveExtension;
-    function removeExtension(path, extension) {
-        return path.substring(0, path.length - extension.length);
-    }
-    ts.removeExtension = removeExtension;
-    function changeExtension(path, newExtension) {
-        return changeAnyExtension(path, newExtension, extensionsToRemove, /*ignoreCase*/ false);
-    }
-    ts.changeExtension = changeExtension;
-    function changeAnyExtension(path, ext, extensions, ignoreCase) {
-        var pathext = extensions !== undefined && ignoreCase !== undefined ? getAnyExtensionFromPath(path, extensions, ignoreCase) : getAnyExtensionFromPath(path);
-        return pathext ? path.slice(0, path.length - pathext.length) + (startsWith(ext, ".") ? ext : "." + ext) : path;
-    }
-    ts.changeAnyExtension = changeAnyExtension;
-    /**
-     * Takes a string like "jquery-min.4.2.3" and returns "jquery"
-     */
-    function removeMinAndVersionNumbers(fileName) {
-        // Match a "." or "-" followed by a version number or 'min' at the end of the name
-        var trailingMinOrVersion = /[.-]((min)|(\d+(\.\d+)*))$/;
-        // The "min" or version may both be present, in either order, so try applying the above twice.
-        return fileName.replace(trailingMinOrVersion, "").replace(trailingMinOrVersion, "");
-    }
-    ts.removeMinAndVersionNumbers = removeMinAndVersionNumbers;
-    function Symbol(flags, name) {
-        this.flags = flags;
-        this.escapedName = name;
-        this.declarations = undefined;
-        this.valueDeclaration = undefined;
-        this.id = undefined;
-        this.mergeId = undefined;
-        this.parent = undefined;
-    }
-    function Type(checker, flags) {
-        this.flags = flags;
-        if (Debug.isDebugging) {
-            this.checker = checker;
-        }
-    }
-    function Signature() { } // tslint:disable-line no-empty
-    function Node(kind, pos, end) {
-        this.pos = pos;
-        this.end = end;
-        this.kind = kind;
-        this.id = 0;
-        this.flags = 0 /* None */;
-        this.modifierFlagsCache = 0 /* None */;
-        this.transformFlags = 0 /* None */;
-        this.parent = undefined;
-        this.original = undefined;
-    }
-    function SourceMapSource(fileName, text, skipTrivia) {
-        this.fileName = fileName;
-        this.text = text;
-        this.skipTrivia = skipTrivia || (function (pos) { return pos; });
-    }
-    ts.objectAllocator = {
-        getNodeConstructor: function () { return Node; },
-        getTokenConstructor: function () { return Node; },
-        getIdentifierConstructor: function () { return Node; },
-        getSourceFileConstructor: function () { return Node; },
-        getSymbolConstructor: function () { return Symbol; },
-        getTypeConstructor: function () { return Type; },
-        getSignatureConstructor: function () { return Signature; },
-        getSourceMapSourceConstructor: function () { return SourceMapSource; },
-    };
-    var AssertionLevel;
-    (function (AssertionLevel) {
-        AssertionLevel[AssertionLevel["None"] = 0] = "None";
-        AssertionLevel[AssertionLevel["Normal"] = 1] = "Normal";
-        AssertionLevel[AssertionLevel["Aggressive"] = 2] = "Aggressive";
-        AssertionLevel[AssertionLevel["VeryAggressive"] = 3] = "VeryAggressive";
-    })(AssertionLevel = ts.AssertionLevel || (ts.AssertionLevel = {}));
-    var Debug;
-    (function (Debug) {
-        Debug.currentAssertionLevel = 0 /* None */;
-        Debug.isDebugging = false;
-        function shouldAssert(level) {
-            return Debug.currentAssertionLevel >= level;
-        }
-        Debug.shouldAssert = shouldAssert;
-        function assert(expression, message, verboseDebugInfo, stackCrawlMark) {
-            if (!expression) {
-                if (verboseDebugInfo) {
-                    message += "\r\nVerbose Debug Information: " + (typeof verboseDebugInfo === "string" ? verboseDebugInfo : verboseDebugInfo());
-                }
-                fail(message ? "False expression: " + message : "False expression.", stackCrawlMark || assert);
-            }
-        }
-        Debug.assert = assert;
-        function assertEqual(a, b, msg, msg2) {
-            if (a !== b) {
-                var message = msg ? msg2 ? msg + " " + msg2 : msg : "";
-                fail("Expected " + a + " === " + b + ". " + message);
-            }
-        }
-        Debug.assertEqual = assertEqual;
-        function assertLessThan(a, b, msg) {
-            if (a >= b) {
-                fail("Expected " + a + " < " + b + ". " + (msg || ""));
-            }
-        }
-        Debug.assertLessThan = assertLessThan;
-        function assertLessThanOrEqual(a, b) {
-            if (a > b) {
-                fail("Expected " + a + " <= " + b);
-            }
-        }
-        Debug.assertLessThanOrEqual = assertLessThanOrEqual;
-        function assertGreaterThanOrEqual(a, b) {
-            if (a < b) {
-                fail("Expected " + a + " >= " + b);
-            }
-        }
-        Debug.assertGreaterThanOrEqual = assertGreaterThanOrEqual;
-        function fail(message, stackCrawlMark) {
-            debugger;
-            var e = new Error(message ? "Debug Failure. " + message : "Debug Failure.");
-            if (Error.captureStackTrace) {
-                Error.captureStackTrace(e, stackCrawlMark || fail);
-            }
-            throw e;
-        }
-        Debug.fail = fail;
-        function assertDefined(value, message) {
-            if (value === undefined || value === null)
-                return fail(message);
-            return value;
-        }
-        Debug.assertDefined = assertDefined;
-        function assertEachDefined(value, message) {
-            for (var _i = 0, value_1 = value; _i < value_1.length; _i++) {
-                var v = value_1[_i];
-                assertDefined(v, message);
-            }
-            return value;
-        }
-        Debug.assertEachDefined = assertEachDefined;
-        function assertNever(member, message, stackCrawlMark) {
-            return fail(message || "Illegal value: " + member, stackCrawlMark || assertNever);
-        }
-        Debug.assertNever = assertNever;
-        function getFunctionName(func) {
-            if (typeof func !== "function") {
-                return "";
-            }
-            else if (func.hasOwnProperty("name")) {
-                return func.name;
-            }
-            else {
-                var text = Function.prototype.toString.call(func);
-                var match = /^function\s+([\w\$]+)\s*\(/.exec(text);
-                return match ? match[1] : "";
-            }
-        }
-        Debug.getFunctionName = getFunctionName;
-        function showSymbol(symbol) {
-            var symbolFlags = ts.SymbolFlags;
-            return "{ flags: " + (symbolFlags ? showFlags(symbol.flags, symbolFlags) : symbol.flags) + "; declarations: " + map(symbol.declarations, showSyntaxKind) + " }";
-        }
-        Debug.showSymbol = showSymbol;
-        function showFlags(flags, flagsEnum) {
-            var out = [];
-            for (var pow = 0; pow <= 30; pow++) {
-                var n = 1 << pow;
-                if (flags & n) {
-                    out.push(flagsEnum[n]);
-                }
-            }
-            return out.join("|");
-        }
-        function showSyntaxKind(node) {
-            var syntaxKind = ts.SyntaxKind;
-            return syntaxKind ? syntaxKind[node.kind] : node.kind.toString();
-        }
-        Debug.showSyntaxKind = showSyntaxKind;
-    })(Debug = ts.Debug || (ts.Debug = {}));
-    /** Remove an item from an array, moving everything to its right one space left. */
-    function orderedRemoveItem(array, item) {
-        for (var i = 0; i < array.length; i++) {
-            if (array[i] === item) {
-                orderedRemoveItemAt(array, i);
-                return true;
-            }
-        }
-        return false;
-    }
-    ts.orderedRemoveItem = orderedRemoveItem;
-    /** Remove an item by index from an array, moving everything to its right one space left. */
-    function orderedRemoveItemAt(array, index) {
-        // This seems to be faster than either `array.splice(i, 1)` or `array.copyWithin(i, i+ 1)`.
-        for (var i = index; i < array.length - 1; i++) {
-            array[i] = array[i + 1];
-        }
-        array.pop();
-    }
-    ts.orderedRemoveItemAt = orderedRemoveItemAt;
-    function unorderedRemoveItemAt(array, index) {
-        // Fill in the "hole" left at `index`.
-        array[index] = array[array.length - 1];
-        array.pop();
-    }
-    ts.unorderedRemoveItemAt = unorderedRemoveItemAt;
-    /** Remove the *first* occurrence of `item` from the array. */
-    function unorderedRemoveItem(array, item) {
-        return unorderedRemoveFirstItemWhere(array, function (element) { return element === item; });
-    }
-    ts.unorderedRemoveItem = unorderedRemoveItem;
-    /** Remove the *first* element satisfying `predicate`. */
-    function unorderedRemoveFirstItemWhere(array, predicate) {
-        for (var i = 0; i < array.length; i++) {
-            if (predicate(array[i])) {
-                unorderedRemoveItemAt(array, i);
-                return true;
-            }
-        }
-        return false;
-    }
-    function createGetCanonicalFileName(useCaseSensitiveFileNames) {
-        return useCaseSensitiveFileNames ? identity : toLowerCase;
-    }
-    ts.createGetCanonicalFileName = createGetCanonicalFileName;
-    /**
-     * patternStrings contains both pattern strings (containing "*") and regular strings.
-     * Return an exact match if possible, or a pattern match, or undefined.
-     * (These are verified by verifyCompilerOptions to have 0 or 1 "*" characters.)
-     */
-    function matchPatternOrExact(patternStrings, candidate) {
-        var patterns = [];
-        for (var _i = 0, patternStrings_1 = patternStrings; _i < patternStrings_1.length; _i++) {
-            var patternString = patternStrings_1[_i];
-            var pattern = tryParsePattern(patternString);
-            if (pattern) {
-                patterns.push(pattern);
-            }
-            else if (patternString === candidate) {
-                // pattern was matched as is - no need to search further
-                return patternString;
-            }
-        }
-        return findBestPatternMatch(patterns, function (_) { return _; }, candidate);
-    }
-    ts.matchPatternOrExact = matchPatternOrExact;
-    function patternText(_a) {
-        var prefix = _a.prefix, suffix = _a.suffix;
-        return prefix + "*" + suffix;
-    }
-    ts.patternText = patternText;
-    /**
-     * Given that candidate matches pattern, returns the text matching the '*'.
-     * E.g.: matchedText(tryParsePattern("foo*baz"), "foobarbaz") === "bar"
-     */
-    function matchedText(pattern, candidate) {
-        Debug.assert(isPatternMatch(pattern, candidate));
-        return candidate.substring(pattern.prefix.length, candidate.length - pattern.suffix.length);
-    }
-    ts.matchedText = matchedText;
-    /** Return the object corresponding to the best pattern to match `candidate`. */
-    function findBestPatternMatch(values, getPattern, candidate) {
-        var matchedValue;
-        // use length of prefix as betterness criteria
-        var longestMatchPrefixLength = -1;
-        for (var _i = 0, values_2 = values; _i < values_2.length; _i++) {
-            var v = values_2[_i];
-            var pattern = getPattern(v);
-            if (isPatternMatch(pattern, candidate) && pattern.prefix.length > longestMatchPrefixLength) {
-                longestMatchPrefixLength = pattern.prefix.length;
-                matchedValue = v;
-            }
-        }
-        return matchedValue;
-    }
-    ts.findBestPatternMatch = findBestPatternMatch;
-    function isPatternMatch(_a, candidate) {
-        var prefix = _a.prefix, suffix = _a.suffix;
-        return candidate.length >= prefix.length + suffix.length &&
-            startsWith(candidate, prefix) &&
-            endsWith(candidate, suffix);
-    }
-    function tryParsePattern(pattern) {
-        // This should be verified outside of here and a proper error thrown.
-        Debug.assert(hasZeroOrOneAsteriskCharacter(pattern));
-        var indexOfStar = pattern.indexOf("*");
-        return indexOfStar === -1 ? undefined : {
-            prefix: pattern.substr(0, indexOfStar),
-            suffix: pattern.substr(indexOfStar + 1)
-        };
-    }
-    ts.tryParsePattern = tryParsePattern;
-    function positionIsSynthesized(pos) {
-        // This is a fast way of testing the following conditions:
-        //  pos === undefined || pos === null || isNaN(pos) || pos < 0;
-        return !(pos >= 0);
-    }
-    ts.positionIsSynthesized = positionIsSynthesized;
-    /** True if an extension is one of the supported TypeScript extensions. */
-    function extensionIsTypeScript(ext) {
-        return ext === ".ts" /* Ts */ || ext === ".tsx" /* Tsx */ || ext === ".d.ts" /* Dts */;
-    }
-    ts.extensionIsTypeScript = extensionIsTypeScript;
-    function resolutionExtensionIsTypeScriptOrJson(ext) {
-        return extensionIsTypeScript(ext) || ext === ".json" /* Json */;
-    }
-    ts.resolutionExtensionIsTypeScriptOrJson = resolutionExtensionIsTypeScriptOrJson;
-    /**
-     * Gets the extension from a path.
-     * Path must have a valid extension.
-     */
-    function extensionFromPath(path) {
-        var ext = tryGetExtensionFromPath(path);
-        return ext !== undefined ? ext : Debug.fail("File " + path + " has unknown extension.");
-    }
-    ts.extensionFromPath = extensionFromPath;
-    function isAnySupportedFileExtension(path) {
-        return tryGetExtensionFromPath(path) !== undefined;
-    }
-    ts.isAnySupportedFileExtension = isAnySupportedFileExtension;
-    function tryGetExtensionFromPath(path) {
-        return find(ts.supportedTypescriptExtensionsForExtractExtension, function (e) { return fileExtensionIs(path, e); }) || find(ts.supportedJavascriptExtensions, function (e) { return fileExtensionIs(path, e); });
-    }
-    ts.tryGetExtensionFromPath = tryGetExtensionFromPath;
-    function getAnyExtensionFromPathWorker(path, extensions, stringEqualityComparer) {
-        if (typeof extensions === "string")
-            extensions = [extensions];
-        for (var _i = 0, extensions_2 = extensions; _i < extensions_2.length; _i++) {
-            var extension = extensions_2[_i];
-            if (!startsWith(extension, "."))
-                extension = "." + extension;
-            if (path.length >= extension.length && path.charAt(path.length - extension.length) === ".") {
-                var pathExtension = path.slice(path.length - extension.length);
-                if (stringEqualityComparer(pathExtension, extension)) {
-                    return pathExtension;
-                }
-            }
-        }
-        return "";
-    }
-    function getAnyExtensionFromPath(path, extensions, ignoreCase) {
-        // Retrieves any string from the final "." onwards from a base file name.
-        // Unlike extensionFromPath, which throws an exception on unrecognized extensions.
-        if (extensions) {
-            return getAnyExtensionFromPathWorker(path, extensions, ignoreCase ? equateStringsCaseInsensitive : equateStringsCaseSensitive);
-        }
-        var baseFileName = getBaseFileName(path);
-        var extensionIndex = baseFileName.lastIndexOf(".");
-        if (extensionIndex >= 0) {
-            return baseFileName.substring(extensionIndex);
-        }
-        return "";
-    }
-    ts.getAnyExtensionFromPath = getAnyExtensionFromPath;
-    function isCheckJsEnabledForFile(sourceFile, compilerOptions) {
-        return sourceFile.checkJsDirective ? sourceFile.checkJsDirective.enabled : compilerOptions.checkJs;
-    }
-    ts.isCheckJsEnabledForFile = isCheckJsEnabledForFile;
-    function and(f, g) {
-        return function (arg) { return f(arg) && g(arg); };
-    }
-    ts.and = and;
-    function or(f, g) {
-        return function (arg) { return f(arg) || g(arg); };
-    }
-    ts.or = or;
-    function assertTypeIsNever(_) { } // tslint:disable-line no-empty
-    ts.assertTypeIsNever = assertTypeIsNever;
-    ts.emptyFileSystemEntries = {
-        files: ts.emptyArray,
-        directories: ts.emptyArray
-    };
-    function singleElementArray(t) {
-        return t === undefined ? undefined : [t];
-    }
-    ts.singleElementArray = singleElementArray;
-    function enumerateInsertsAndDeletes(newItems, oldItems, comparer, inserted, deleted, unchanged) {
-        unchanged = unchanged || noop;
-        var newIndex = 0;
-        var oldIndex = 0;
-        var newLen = newItems.length;
-        var oldLen = oldItems.length;
-        while (newIndex < newLen && oldIndex < oldLen) {
-            var newItem = newItems[newIndex];
-            var oldItem = oldItems[oldIndex];
-            var compareResult = comparer(newItem, oldItem);
-            if (compareResult === -1 /* LessThan */) {
-                inserted(newItem);
-                newIndex++;
-            }
-            else if (compareResult === 1 /* GreaterThan */) {
-                deleted(oldItem);
-                oldIndex++;
-            }
-            else {
-                unchanged(oldItem, newItem);
-                newIndex++;
-                oldIndex++;
-            }
-        }
-        while (newIndex < newLen) {
-            inserted(newItems[newIndex++]);
-        }
-        while (oldIndex < oldLen) {
-            deleted(oldItems[oldIndex++]);
-        }
-    }
-    ts.enumerateInsertsAndDeletes = enumerateInsertsAndDeletes;
-})(ts || (ts = {}));
 var ts;
 (function (ts) {
     /**
@@ -5166,6 +3908,8 @@ var ts;
                 },
                 readDirectory: readDirectory,
                 getModifiedTime: getModifiedTime,
+                setModifiedTime: setModifiedTime,
+                deleteFile: deleteFile,
                 createHash: _crypto ? createMD5HashUsingNativeCrypto : generateDjb2Hash,
                 createSHA256Hash: _crypto ? createSHA256Hash : undefined,
                 getMemoryUsage: function () {
@@ -5595,6 +4339,22 @@ var ts;
                     return undefined;
                 }
             }
+            function setModifiedTime(path, time) {
+                try {
+                    _fs.utimesSync(path, time, time);
+                }
+                catch (e) {
+                    return;
+                }
+            }
+            function deleteFile(path) {
+                try {
+                    return _fs.unlinkSync(path);
+                }
+                catch (e) {
+                    return;
+                }
+            }
             /**
              * djb2 hashing algorithm
              * http://www.cse.yorku.ca/~oz/hash.html
@@ -5691,7 +4451,7 @@ var ts;
     }
 })(ts || (ts = {}));
 // <auto-generated />
-// generated from './diagnosticInformationMap.generated.ts' by '../../scripts/processDiagnosticMessages.js'
+// generated from './diagnosticInformationMap.generated.ts' by 'src\parser'
 /* @internal */
 var ts;
 (function (ts) {
@@ -6292,6 +5052,8 @@ var ts;
         Cannot_invoke_an_object_which_is_possibly_null_or_undefined: diag(2723, ts.DiagnosticCategory.Error, "Cannot_invoke_an_object_which_is_possibly_null_or_undefined_2723", "Cannot invoke an object which is possibly 'null' or 'undefined'."),
         Module_0_has_no_exported_member_1_Did_you_mean_2: diag(2724, ts.DiagnosticCategory.Error, "Module_0_has_no_exported_member_1_Did_you_mean_2_2724", "Module '{0}' has no exported member '{1}'. Did you mean '{2}'?"),
         Class_name_cannot_be_Object_when_targeting_ES5_with_module_0: diag(2725, ts.DiagnosticCategory.Error, "Class_name_cannot_be_Object_when_targeting_ES5_with_module_0_2725", "Class name cannot be 'Object' when targeting ES5 with module {0}."),
+        Cannot_find_lib_definition_for_0: diag(2726, ts.DiagnosticCategory.Error, "Cannot_find_lib_definition_for_0_2726", "Cannot find lib definition for '{0}'."),
+        Cannot_find_lib_definition_for_0_Did_you_mean_1: diag(2727, ts.DiagnosticCategory.Error, "Cannot_find_lib_definition_for_0_Did_you_mean_1_2727", "Cannot find lib definition for '{0}'. Did you mean '{1}'?"),
         Import_declaration_0_is_using_private_name_1: diag(4000, ts.DiagnosticCategory.Error, "Import_declaration_0_is_using_private_name_1_4000", "Import declaration '{0}' is using private name '{1}'."),
         Type_parameter_0_of_exported_class_has_or_is_using_private_name_1: diag(4002, ts.DiagnosticCategory.Error, "Type_parameter_0_of_exported_class_has_or_is_using_private_name_1_4002", "Type parameter '{0}' of exported class has or is using private name '{1}'."),
         Type_parameter_0_of_exported_interface_has_or_is_using_private_name_1: diag(4004, ts.DiagnosticCategory.Error, "Type_parameter_0_of_exported_interface_has_or_is_using_private_name_1_4004", "Type parameter '{0}' of exported interface has or is using private name '{1}'."),
@@ -6600,6 +5362,28 @@ var ts;
         File_0_is_not_in_project_file_list_Projects_must_list_all_files_or_use_an_include_pattern: diag(6307, ts.DiagnosticCategory.Error, "File_0_is_not_in_project_file_list_Projects_must_list_all_files_or_use_an_include_pattern_6307", "File '{0}' is not in project file list. Projects must list all files or use an 'include' pattern."),
         Cannot_prepend_project_0_because_it_does_not_have_outFile_set: diag(6308, ts.DiagnosticCategory.Error, "Cannot_prepend_project_0_because_it_does_not_have_outFile_set_6308", "Cannot prepend project '{0}' because it does not have 'outFile' set"),
         Output_file_0_from_project_1_does_not_exist: diag(6309, ts.DiagnosticCategory.Error, "Output_file_0_from_project_1_does_not_exist_6309", "Output file '{0}' from project '{1}' does not exist"),
+        Project_0_is_out_of_date_because_oldest_output_1_is_older_than_newest_input_2: diag(6350, ts.DiagnosticCategory.Message, "Project_0_is_out_of_date_because_oldest_output_1_is_older_than_newest_input_2_6350", "Project '{0}' is out of date because oldest output '{1}' is older than newest input '{2}'"),
+        Project_0_is_up_to_date_because_newest_input_1_is_older_than_oldest_output_2: diag(6351, ts.DiagnosticCategory.Message, "Project_0_is_up_to_date_because_newest_input_1_is_older_than_oldest_output_2_6351", "Project '{0}' is up to date because newest input '{1}' is older than oldest output '{2}'"),
+        Project_0_is_out_of_date_because_output_file_1_does_not_exist: diag(6352, ts.DiagnosticCategory.Message, "Project_0_is_out_of_date_because_output_file_1_does_not_exist_6352", "Project '{0}' is out of date because output file '{1}' does not exist"),
+        Project_0_is_out_of_date_because_its_dependency_1_is_out_of_date: diag(6353, ts.DiagnosticCategory.Message, "Project_0_is_out_of_date_because_its_dependency_1_is_out_of_date_6353", "Project '{0}' is out of date because its dependency '{1}' is out of date"),
+        Project_0_is_up_to_date_with_d_ts_files_from_its_dependencies: diag(6354, ts.DiagnosticCategory.Message, "Project_0_is_up_to_date_with_d_ts_files_from_its_dependencies_6354", "Project '{0}' is up to date with .d.ts files from its dependencies"),
+        Projects_in_this_build_Colon_0: diag(6355, ts.DiagnosticCategory.Message, "Projects_in_this_build_Colon_0_6355", "Projects in this build: {0}"),
+        A_non_dry_build_would_delete_the_following_files_Colon_0: diag(6356, ts.DiagnosticCategory.Message, "A_non_dry_build_would_delete_the_following_files_Colon_0_6356", "A non-dry build would delete the following files: {0}"),
+        A_non_dry_build_would_build_project_0: diag(6357, ts.DiagnosticCategory.Message, "A_non_dry_build_would_build_project_0_6357", "A non-dry build would build project '{0}'"),
+        Building_project_0: diag(6358, ts.DiagnosticCategory.Message, "Building_project_0_6358", "Building project '{0}'..."),
+        Updating_output_timestamps_of_project_0: diag(6359, ts.DiagnosticCategory.Message, "Updating_output_timestamps_of_project_0_6359", "Updating output timestamps of project '{0}'..."),
+        delete_this_Project_0_is_up_to_date_because_it_was_previously_built: diag(6360, ts.DiagnosticCategory.Message, "delete_this_Project_0_is_up_to_date_because_it_was_previously_built_6360", "delete this - Project '{0}' is up to date because it was previously built"),
+        Project_0_is_up_to_date: diag(6361, ts.DiagnosticCategory.Message, "Project_0_is_up_to_date_6361", "Project '{0}' is up to date"),
+        Skipping_build_of_project_0_because_its_dependency_1_has_errors: diag(6362, ts.DiagnosticCategory.Message, "Skipping_build_of_project_0_because_its_dependency_1_has_errors_6362", "Skipping build of project '{0}' because its dependency '{1}' has errors"),
+        Project_0_can_t_be_built_because_its_dependency_1_has_errors: diag(6363, ts.DiagnosticCategory.Message, "Project_0_can_t_be_built_because_its_dependency_1_has_errors_6363", "Project '{0}' can't be built because its dependency '{1}' has errors"),
+        Build_one_or_more_projects_and_their_dependencies_if_out_of_date: diag(6364, ts.DiagnosticCategory.Message, "Build_one_or_more_projects_and_their_dependencies_if_out_of_date_6364", "Build one or more projects and their dependencies, if out of date"),
+        Delete_the_outputs_of_all_projects: diag(6365, ts.DiagnosticCategory.Message, "Delete_the_outputs_of_all_projects_6365", "Delete the outputs of all projects"),
+        Enable_verbose_logging: diag(6366, ts.DiagnosticCategory.Message, "Enable_verbose_logging_6366", "Enable verbose logging"),
+        Show_what_would_be_built_or_deleted_if_specified_with_clean: diag(6367, ts.DiagnosticCategory.Message, "Show_what_would_be_built_or_deleted_if_specified_with_clean_6367", "Show what would be built (or deleted, if specified with '--clean')"),
+        Build_all_projects_including_those_that_appear_to_be_up_to_date: diag(6368, ts.DiagnosticCategory.Message, "Build_all_projects_including_those_that_appear_to_be_up_to_date_6368", "Build all projects, including those that appear to be up to date"),
+        Option_build_must_be_the_first_command_line_argument: diag(6369, ts.DiagnosticCategory.Error, "Option_build_must_be_the_first_command_line_argument_6369", "Option '--build' must be the first command line argument."),
+        Options_0_and_1_cannot_be_combined: diag(6370, ts.DiagnosticCategory.Error, "Options_0_and_1_cannot_be_combined_6370", "Options '{0}' and '{1}' cannot be combined."),
+        Skipping_clean_because_not_all_projects_could_be_located: diag(6371, ts.DiagnosticCategory.Error, "Skipping_clean_because_not_all_projects_could_be_located_6371", "Skipping clean because not all projects could be located"),
         Variable_0_implicitly_has_an_1_type: diag(7005, ts.DiagnosticCategory.Error, "Variable_0_implicitly_has_an_1_type_7005", "Variable '{0}' implicitly has an '{1}' type."),
         Parameter_0_implicitly_has_an_1_type: diag(7006, ts.DiagnosticCategory.Error, "Parameter_0_implicitly_has_an_1_type_7006", "Parameter '{0}' implicitly has an '{1}' type."),
         Member_0_implicitly_has_an_1_type: diag(7008, ts.DiagnosticCategory.Error, "Member_0_implicitly_has_an_1_type_7008", "Member '{0}' implicitly has an '{1}' type."),
@@ -8655,8 +7439,38 @@ var ts;
     }
     ts.createScanner = createScanner;
 })(ts || (ts = {}));
-/* @internal */
+/** Non-internal stuff goes here */
 var ts;
+(function (ts) {
+    ts.emptyArray = [];
+    function closeFileWatcher(watcher) {
+        watcher.close();
+    }
+    ts.closeFileWatcher = closeFileWatcher;
+    function isExternalModuleNameRelative(moduleName) {
+        // TypeScript 1.0 spec (April 2014): 11.2.1
+        // An external module name is "relative" if the first term is "." or "..".
+        // Update: We also consider a path like `C:\foo.ts` "relative" because we do not search for it in `node_modules` or treat it as an ambient module.
+        return ts.pathIsRelative(moduleName) || ts.isRootedDiskPath(moduleName);
+    }
+    ts.isExternalModuleNameRelative = isExternalModuleNameRelative;
+    function sortAndDeduplicateDiagnostics(diagnostics) {
+        return ts.sortAndDeduplicate(diagnostics, ts.compareDiagnostics);
+    }
+    ts.sortAndDeduplicateDiagnostics = sortAndDeduplicateDiagnostics;
+    function toPath(fileName, basePath, getCanonicalFileName) {
+        var nonCanonicalizedPath = ts.isRootedDiskPath(fileName)
+            ? ts.normalizePath(fileName)
+            : ts.getNormalizedAbsolutePath(fileName, basePath);
+        return getCanonicalFileName(nonCanonicalizedPath);
+    }
+    ts.toPath = toPath;
+    function hasEntries(map) {
+        return !!map && !!map.size;
+    }
+    ts.hasEntries = hasEntries;
+})(ts || (ts = {}));
+/* @internal */
 (function (ts) {
     ts.resolvingEmptyArray = [];
     ts.emptyMap = ts.createMap();
@@ -8675,6 +7489,22 @@ var ts;
         return undefined;
     }
     ts.getDeclarationOfKind = getDeclarationOfKind;
+    /** Create a new escaped identifier map. */
+    function createUnderscoreEscapedMap() {
+        return new ts.MapCtr();
+    }
+    ts.createUnderscoreEscapedMap = createUnderscoreEscapedMap;
+    function createSymbolTable(symbols) {
+        var result = ts.createMap();
+        if (symbols) {
+            for (var _i = 0, symbols_1 = symbols; _i < symbols_1.length; _i++) {
+                var symbol = symbols_1[_i];
+                result.set(symbol.escapedName, symbol);
+            }
+        }
+        return result;
+    }
+    ts.createSymbolTable = createSymbolTable;
     var stringWriter = createSingleLineStringWriter();
     function createSingleLineStringWriter() {
         var str = "";
@@ -8710,6 +7540,80 @@ var ts;
             reportPrivateInBaseOfClassExpression: ts.noop,
         };
     }
+    function changesAffectModuleResolution(oldOptions, newOptions) {
+        return !oldOptions ||
+            (oldOptions.module !== newOptions.module) ||
+            (oldOptions.moduleResolution !== newOptions.moduleResolution) ||
+            (oldOptions.noResolve !== newOptions.noResolve) ||
+            (oldOptions.target !== newOptions.target) ||
+            (oldOptions.noLib !== newOptions.noLib) ||
+            (oldOptions.jsx !== newOptions.jsx) ||
+            (oldOptions.allowJs !== newOptions.allowJs) ||
+            (oldOptions.rootDir !== newOptions.rootDir) ||
+            (oldOptions.configFilePath !== newOptions.configFilePath) ||
+            (oldOptions.baseUrl !== newOptions.baseUrl) ||
+            (oldOptions.maxNodeModuleJsDepth !== newOptions.maxNodeModuleJsDepth) ||
+            !ts.arrayIsEqualTo(oldOptions.lib, newOptions.lib) ||
+            !ts.arrayIsEqualTo(oldOptions.typeRoots, newOptions.typeRoots) ||
+            !ts.arrayIsEqualTo(oldOptions.rootDirs, newOptions.rootDirs) ||
+            !ts.equalOwnProperties(oldOptions.paths, newOptions.paths);
+    }
+    ts.changesAffectModuleResolution = changesAffectModuleResolution;
+    function findAncestor(node, callback) {
+        while (node) {
+            var result = callback(node);
+            if (result === "quit") {
+                return undefined;
+            }
+            else if (result) {
+                return node;
+            }
+            node = node.parent;
+        }
+        return undefined;
+    }
+    ts.findAncestor = findAncestor;
+    function forEachEntry(map, callback) {
+        var _a;
+        var iterator = map.entries();
+        for (var _b = iterator.next(), pair = _b.value, done = _b.done; !done; _a = iterator.next(), pair = _a.value, done = _a.done, _a) {
+            var key = pair[0], value = pair[1];
+            var result = callback(value, key);
+            if (result) {
+                return result;
+            }
+        }
+        return undefined;
+    }
+    ts.forEachEntry = forEachEntry;
+    function forEachKey(map, callback) {
+        var _a;
+        var iterator = map.keys();
+        for (var _b = iterator.next(), key = _b.value, done = _b.done; !done; _a = iterator.next(), key = _a.value, done = _a.done, _a) {
+            var result = callback(key);
+            if (result) {
+                return result;
+            }
+        }
+        return undefined;
+    }
+    ts.forEachKey = forEachKey;
+    function copyEntries(source, target) {
+        source.forEach(function (value, key) {
+            target.set(key, value);
+        });
+    }
+    ts.copyEntries = copyEntries;
+    function arrayToSet(array, makeKey) {
+        return ts.arrayToMap(array, makeKey || (function (s) { return s; }), function () { return true; });
+    }
+    ts.arrayToSet = arrayToSet;
+    function cloneMap(map) {
+        var clone = ts.createMap();
+        copyEntries(map, clone);
+        return clone;
+    }
+    ts.cloneMap = cloneMap;
     function usingSingleLineStringWriter(action) {
         var oldString = stringWriter.getText();
         try {
@@ -9083,6 +7987,16 @@ var ts;
         return ts.isModuleDeclaration(node) && ts.isStringLiteral(node.name);
     }
     ts.isNonGlobalAmbientModule = isNonGlobalAmbientModule;
+    /**
+     * An effective module (namespace) declaration is either
+     * 1. An actual declaration: namespace X { ... }
+     * 2. A Javascript declaration, which is:
+     *    An identifier in a nested property access expression: Y in `X.Y.Z = { ... }`
+     */
+    function isEffectiveModuleDeclaration(node) {
+        return ts.isModuleDeclaration(node) || ts.isIdentifier(node);
+    }
+    ts.isEffectiveModuleDeclaration = isEffectiveModuleDeclaration;
     /** Given a symbol for a module, checks that it is a shorthand ambient module. */
     function isShorthandAmbientModuleSymbol(moduleSymbol) {
         return isShorthandAmbientModule(moduleSymbol.valueDeclaration);
@@ -9213,7 +8127,7 @@ var ts;
     // Gets the nearest enclosing block scope container that has the provided node
     // as a descendant, that is not the provided node.
     function getEnclosingBlockScopeContainer(node) {
-        return ts.findAncestor(node.parent, function (current) { return isBlockScope(current, current.parent); });
+        return findAncestor(node.parent, function (current) { return isBlockScope(current, current.parent); });
     }
     ts.getEnclosingBlockScopeContainer = getEnclosingBlockScopeContainer;
     // Return display name of an identifier
@@ -9727,11 +8641,11 @@ var ts;
     }
     ts.getTsConfigPropArray = getTsConfigPropArray;
     function getContainingFunction(node) {
-        return ts.findAncestor(node.parent, ts.isFunctionLike);
+        return findAncestor(node.parent, ts.isFunctionLike);
     }
     ts.getContainingFunction = getContainingFunction;
     function getContainingClass(node) {
-        return ts.findAncestor(node.parent, ts.isClassLike);
+        return findAncestor(node.parent, ts.isClassLike);
     }
     ts.getContainingClass = getContainingClass;
     function getThisContainer(node, includeArrowFunctions) {
@@ -10555,7 +9469,7 @@ var ts;
     }
     ts.getHostSignatureFromJSDocHost = getHostSignatureFromJSDocHost;
     function getJSDocHost(node) {
-        return ts.Debug.assertDefined(ts.findAncestor(node.parent, ts.isJSDoc)).parent;
+        return ts.Debug.assertDefined(findAncestor(node.parent, ts.isJSDoc)).parent;
     }
     ts.getJSDocHost = getJSDocHost;
     function getTypeParameterFromJsDoc(node) {
@@ -11355,13 +10269,25 @@ var ts;
         var lineStart;
         var lineCount;
         var linePos;
+        function updateLineCountAndPosFor(s) {
+            var lineStartsOfS = ts.computeLineStarts(s);
+            if (lineStartsOfS.length > 1) {
+                lineCount = lineCount + lineStartsOfS.length - 1;
+                linePos = output.length - s.length + ts.last(lineStartsOfS);
+                lineStart = (linePos - output.length) === 0;
+            }
+            else {
+                lineStart = false;
+            }
+        }
         function write(s) {
             if (s && s.length) {
                 if (lineStart) {
-                    output += getIndentString(indent);
+                    s = getIndentString(indent) + s;
                     lineStart = false;
                 }
                 output += s;
+                updateLineCountAndPosFor(s);
             }
         }
         function reset() {
@@ -11373,20 +10299,13 @@ var ts;
         }
         function rawWrite(s) {
             if (s !== undefined) {
-                if (lineStart) {
-                    lineStart = false;
-                }
                 output += s;
+                updateLineCountAndPosFor(s);
             }
         }
         function writeLiteral(s) {
             if (s && s.length) {
                 write(s);
-                var lineStartsOfS = ts.computeLineStarts(s);
-                if (lineStartsOfS.length > 1) {
-                    lineCount = lineCount + lineStartsOfS.length - 1;
-                    linePos = output.length - s.length + ts.last(lineStartsOfS);
-                }
             }
         }
         function writeLine() {
@@ -11398,7 +10317,9 @@ var ts;
             }
         }
         function writeTextOfNode(text, node) {
-            write(getTextOfNodeFromSourceText(text, node));
+            var s = getTextOfNodeFromSourceText(text, node);
+            write(s);
+            updateLineCountAndPosFor(s);
         }
         reset();
         return {
@@ -13810,6 +12731,10 @@ var ts;
         return node.kind === 275 /* Bundle */;
     }
     ts.isBundle = isBundle;
+    function isUnparsedSource(node) {
+        return node.kind === 276 /* UnparsedSource */;
+    }
+    ts.isUnparsedSource = isUnparsedSource;
     // JSDoc
     function isJSDocTypeExpression(node) {
         return node.kind === 278 /* JSDocTypeExpression */;
@@ -14779,6 +13704,1230 @@ var ts;
         return node.kind === 247 /* NamedImports */ || node.kind === 251 /* NamedExports */;
     }
     ts.isNamedImportsOrExports = isNamedImportsOrExports;
+    function Symbol(flags, name) {
+        this.flags = flags;
+        this.escapedName = name;
+        this.declarations = undefined;
+        this.valueDeclaration = undefined;
+        this.id = undefined;
+        this.mergeId = undefined;
+        this.parent = undefined;
+    }
+    function Type(checker, flags) {
+        this.flags = flags;
+        if (Debug.isDebugging) {
+            this.checker = checker;
+        }
+    }
+    function Signature() { } // tslint:disable-line no-empty
+    function Node(kind, pos, end) {
+        this.pos = pos;
+        this.end = end;
+        this.kind = kind;
+        this.id = 0;
+        this.flags = 0 /* None */;
+        this.modifierFlagsCache = 0 /* None */;
+        this.transformFlags = 0 /* None */;
+        this.parent = undefined;
+        this.original = undefined;
+    }
+    function SourceMapSource(fileName, text, skipTrivia) {
+        this.fileName = fileName;
+        this.text = text;
+        this.skipTrivia = skipTrivia || (function (pos) { return pos; });
+    }
+    ts.objectAllocator = {
+        getNodeConstructor: function () { return Node; },
+        getTokenConstructor: function () { return Node; },
+        getIdentifierConstructor: function () { return Node; },
+        getSourceFileConstructor: function () { return Node; },
+        getSymbolConstructor: function () { return Symbol; },
+        getTypeConstructor: function () { return Type; },
+        getSignatureConstructor: function () { return Signature; },
+        getSourceMapSourceConstructor: function () { return SourceMapSource; },
+    };
+    function formatStringFromArgs(text, args, baseIndex) {
+        if (baseIndex === void 0) { baseIndex = 0; }
+        return text.replace(/{(\d+)}/g, function (_match, index) { return Debug.assertDefined(args[+index + baseIndex]); });
+    }
+    ts.formatStringFromArgs = formatStringFromArgs;
+    function getLocaleSpecificMessage(message) {
+        return ts.localizedDiagnosticMessages && ts.localizedDiagnosticMessages[message.key] || message.message;
+    }
+    ts.getLocaleSpecificMessage = getLocaleSpecificMessage;
+    function createFileDiagnostic(file, start, length, message) {
+        Debug.assertGreaterThanOrEqual(start, 0);
+        Debug.assertGreaterThanOrEqual(length, 0);
+        if (file) {
+            Debug.assertLessThanOrEqual(start, file.text.length);
+            Debug.assertLessThanOrEqual(start + length, file.text.length);
+        }
+        var text = getLocaleSpecificMessage(message);
+        if (arguments.length > 4) {
+            text = formatStringFromArgs(text, arguments, 4);
+        }
+        return {
+            file: file,
+            start: start,
+            length: length,
+            messageText: text,
+            category: message.category,
+            code: message.code,
+            reportsUnnecessary: message.reportsUnnecessary,
+        };
+    }
+    ts.createFileDiagnostic = createFileDiagnostic;
+    /* @internal */
+    function formatMessage(_dummy, message) {
+        var text = getLocaleSpecificMessage(message);
+        if (arguments.length > 2) {
+            text = formatStringFromArgs(text, arguments, 2);
+        }
+        return text;
+    }
+    ts.formatMessage = formatMessage;
+    function createCompilerDiagnostic(message) {
+        var text = getLocaleSpecificMessage(message);
+        if (arguments.length > 1) {
+            text = formatStringFromArgs(text, arguments, 1);
+        }
+        return {
+            file: undefined,
+            start: undefined,
+            length: undefined,
+            messageText: text,
+            category: message.category,
+            code: message.code,
+            reportsUnnecessary: message.reportsUnnecessary,
+        };
+    }
+    ts.createCompilerDiagnostic = createCompilerDiagnostic;
+    function createCompilerDiagnosticFromMessageChain(chain) {
+        return {
+            file: undefined,
+            start: undefined,
+            length: undefined,
+            code: chain.code,
+            category: chain.category,
+            messageText: chain.next ? chain : chain.messageText,
+        };
+    }
+    ts.createCompilerDiagnosticFromMessageChain = createCompilerDiagnosticFromMessageChain;
+    function chainDiagnosticMessages(details, message) {
+        var text = getLocaleSpecificMessage(message);
+        if (arguments.length > 2) {
+            text = formatStringFromArgs(text, arguments, 2);
+        }
+        return {
+            messageText: text,
+            category: message.category,
+            code: message.code,
+            next: details
+        };
+    }
+    ts.chainDiagnosticMessages = chainDiagnosticMessages;
+    function concatenateDiagnosticMessageChains(headChain, tailChain) {
+        var lastChain = headChain;
+        while (lastChain.next) {
+            lastChain = lastChain.next;
+        }
+        lastChain.next = tailChain;
+        return headChain;
+    }
+    ts.concatenateDiagnosticMessageChains = concatenateDiagnosticMessageChains;
+    function getDiagnosticFilePath(diagnostic) {
+        return diagnostic.file ? diagnostic.file.path : undefined;
+    }
+    function compareDiagnostics(d1, d2) {
+        return ts.compareStringsCaseSensitive(getDiagnosticFilePath(d1), getDiagnosticFilePath(d2)) ||
+            ts.compareValues(d1.start, d2.start) ||
+            ts.compareValues(d1.length, d2.length) ||
+            ts.compareValues(d1.code, d2.code) ||
+            compareMessageText(d1.messageText, d2.messageText) ||
+            0 /* EqualTo */;
+    }
+    ts.compareDiagnostics = compareDiagnostics;
+    function compareMessageText(t1, t2) {
+        var text1 = t1;
+        var text2 = t2;
+        while (text1 && text2) {
+            // We still have both chains.
+            var string1 = ts.isString(text1) ? text1 : text1.messageText;
+            var string2 = ts.isString(text2) ? text2 : text2.messageText;
+            var res = ts.compareStringsCaseSensitive(string1, string2);
+            if (res) {
+                return res;
+            }
+            text1 = ts.isString(text1) ? undefined : text1.next;
+            text2 = ts.isString(text2) ? undefined : text2.next;
+        }
+        if (!text1 && !text2) {
+            // if the chains are done, then these messages are the same.
+            return 0 /* EqualTo */;
+        }
+        // We still have one chain remaining.  The shorter chain should come first.
+        return text1 ? 1 /* GreaterThan */ : -1 /* LessThan */;
+    }
+    function getEmitScriptTarget(compilerOptions) {
+        return compilerOptions.target || 0 /* ES3 */;
+    }
+    ts.getEmitScriptTarget = getEmitScriptTarget;
+    function getEmitModuleKind(compilerOptions) {
+        return typeof compilerOptions.module === "number" ?
+            compilerOptions.module :
+            getEmitScriptTarget(compilerOptions) >= 2 /* ES2015 */ ? ts.ModuleKind.ES2015 : ts.ModuleKind.CommonJS;
+    }
+    ts.getEmitModuleKind = getEmitModuleKind;
+    function getEmitModuleResolutionKind(compilerOptions) {
+        var moduleResolution = compilerOptions.moduleResolution;
+        if (moduleResolution === undefined) {
+            moduleResolution = getEmitModuleKind(compilerOptions) === ts.ModuleKind.CommonJS ? ts.ModuleResolutionKind.NodeJs : ts.ModuleResolutionKind.Classic;
+        }
+        return moduleResolution;
+    }
+    ts.getEmitModuleResolutionKind = getEmitModuleResolutionKind;
+    function unreachableCodeIsError(options) {
+        return options.allowUnreachableCode === false;
+    }
+    ts.unreachableCodeIsError = unreachableCodeIsError;
+    function unusedLabelIsError(options) {
+        return options.allowUnusedLabels === false;
+    }
+    ts.unusedLabelIsError = unusedLabelIsError;
+    function getAreDeclarationMapsEnabled(options) {
+        return !!(options.declaration && options.declarationMap);
+    }
+    ts.getAreDeclarationMapsEnabled = getAreDeclarationMapsEnabled;
+    function getAllowSyntheticDefaultImports(compilerOptions) {
+        var moduleKind = getEmitModuleKind(compilerOptions);
+        return compilerOptions.allowSyntheticDefaultImports !== undefined
+            ? compilerOptions.allowSyntheticDefaultImports
+            : compilerOptions.esModuleInterop
+                ? moduleKind !== ts.ModuleKind.None && moduleKind < ts.ModuleKind.ES2015
+                : moduleKind === ts.ModuleKind.System;
+    }
+    ts.getAllowSyntheticDefaultImports = getAllowSyntheticDefaultImports;
+    function getEmitDeclarations(compilerOptions) {
+        return !!(compilerOptions.declaration || compilerOptions.composite);
+    }
+    ts.getEmitDeclarations = getEmitDeclarations;
+    function getStrictOptionValue(compilerOptions, flag) {
+        return compilerOptions[flag] === undefined ? !!compilerOptions.strict : !!compilerOptions[flag];
+    }
+    ts.getStrictOptionValue = getStrictOptionValue;
+    function hasZeroOrOneAsteriskCharacter(str) {
+        var seenAsterisk = false;
+        for (var i = 0; i < str.length; i++) {
+            if (str.charCodeAt(i) === 42 /* asterisk */) {
+                if (!seenAsterisk) {
+                    seenAsterisk = true;
+                }
+                else {
+                    // have already seen asterisk
+                    return false;
+                }
+            }
+        }
+        return true;
+    }
+    ts.hasZeroOrOneAsteriskCharacter = hasZeroOrOneAsteriskCharacter;
+    /**
+     * Internally, we represent paths as strings with '/' as the directory separator.
+     * When we make system calls (eg: LanguageServiceHost.getDirectory()),
+     * we expect the host to correctly handle paths in our specified format.
+     */
+    ts.directorySeparator = "/";
+    var altDirectorySeparator = "\\";
+    var urlSchemeSeparator = "://";
+    var backslashRegExp = /\\/g;
+    /**
+     * Normalize path separators.
+     */
+    function normalizeSlashes(path) {
+        return path.replace(backslashRegExp, ts.directorySeparator);
+    }
+    ts.normalizeSlashes = normalizeSlashes;
+    function isVolumeCharacter(charCode) {
+        return (charCode >= 97 /* a */ && charCode <= 122 /* z */) ||
+            (charCode >= 65 /* A */ && charCode <= 90 /* Z */);
+    }
+    function getFileUrlVolumeSeparatorEnd(url, start) {
+        var ch0 = url.charCodeAt(start);
+        if (ch0 === 58 /* colon */)
+            return start + 1;
+        if (ch0 === 37 /* percent */ && url.charCodeAt(start + 1) === 51 /* _3 */) {
+            var ch2 = url.charCodeAt(start + 2);
+            if (ch2 === 97 /* a */ || ch2 === 65 /* A */)
+                return start + 3;
+        }
+        return -1;
+    }
+    /**
+     * Returns length of the root part of a path or URL (i.e. length of "/", "x:/", "//server/share/, file:///user/files").
+     * If the root is part of a URL, the twos-complement of the root length is returned.
+     */
+    function getEncodedRootLength(path) {
+        if (!path)
+            return 0;
+        var ch0 = path.charCodeAt(0);
+        // POSIX or UNC
+        if (ch0 === 47 /* slash */ || ch0 === 92 /* backslash */) {
+            if (path.charCodeAt(1) !== ch0)
+                return 1; // POSIX: "/" (or non-normalized "\")
+            var p1 = path.indexOf(ch0 === 47 /* slash */ ? ts.directorySeparator : altDirectorySeparator, 2);
+            if (p1 < 0)
+                return path.length; // UNC: "//server" or "\\server"
+            return p1 + 1; // UNC: "//server/" or "\\server\"
+        }
+        // DOS
+        if (isVolumeCharacter(ch0) && path.charCodeAt(1) === 58 /* colon */) {
+            var ch2 = path.charCodeAt(2);
+            if (ch2 === 47 /* slash */ || ch2 === 92 /* backslash */)
+                return 3; // DOS: "c:/" or "c:\"
+            if (path.length === 2)
+                return 2; // DOS: "c:" (but not "c:d")
+        }
+        // URL
+        var schemeEnd = path.indexOf(urlSchemeSeparator);
+        if (schemeEnd !== -1) {
+            var authorityStart = schemeEnd + urlSchemeSeparator.length;
+            var authorityEnd = path.indexOf(ts.directorySeparator, authorityStart);
+            if (authorityEnd !== -1) { // URL: "file:///", "file://server/", "file://server/path"
+                // For local "file" URLs, include the leading DOS volume (if present).
+                // Per https://www.ietf.org/rfc/rfc1738.txt, a host of "" or "localhost" is a
+                // special case interpreted as "the machine from which the URL is being interpreted".
+                var scheme = path.slice(0, schemeEnd);
+                var authority = path.slice(authorityStart, authorityEnd);
+                if (scheme === "file" && (authority === "" || authority === "localhost") &&
+                    isVolumeCharacter(path.charCodeAt(authorityEnd + 1))) {
+                    var volumeSeparatorEnd = getFileUrlVolumeSeparatorEnd(path, authorityEnd + 2);
+                    if (volumeSeparatorEnd !== -1) {
+                        if (path.charCodeAt(volumeSeparatorEnd) === 47 /* slash */) {
+                            // URL: "file:///c:/", "file://localhost/c:/", "file:///c%3a/", "file://localhost/c%3a/"
+                            return ~(volumeSeparatorEnd + 1);
+                        }
+                        if (volumeSeparatorEnd === path.length) {
+                            // URL: "file:///c:", "file://localhost/c:", "file:///c$3a", "file://localhost/c%3a"
+                            // but not "file:///c:d" or "file:///c%3ad"
+                            return ~volumeSeparatorEnd;
+                        }
+                    }
+                }
+                return ~(authorityEnd + 1); // URL: "file://server/", "http://server/"
+            }
+            return ~path.length; // URL: "file://server", "http://server"
+        }
+        // relative
+        return 0;
+    }
+    /**
+     * Returns length of the root part of a path or URL (i.e. length of "/", "x:/", "//server/share/, file:///user/files").
+     *
+     * For example:
+     * ```ts
+     * getRootLength("a") === 0                   // ""
+     * getRootLength("/") === 1                   // "/"
+     * getRootLength("c:") === 2                  // "c:"
+     * getRootLength("c:d") === 0                 // ""
+     * getRootLength("c:/") === 3                 // "c:/"
+     * getRootLength("c:\\") === 3                // "c:\\"
+     * getRootLength("//server") === 7            // "//server"
+     * getRootLength("//server/share") === 8      // "//server/"
+     * getRootLength("\\\\server") === 7          // "\\\\server"
+     * getRootLength("\\\\server\\share") === 8   // "\\\\server\\"
+     * getRootLength("file:///path") === 8        // "file:///"
+     * getRootLength("file:///c:") === 10         // "file:///c:"
+     * getRootLength("file:///c:d") === 8         // "file:///"
+     * getRootLength("file:///c:/path") === 11    // "file:///c:/"
+     * getRootLength("file://server") === 13      // "file://server"
+     * getRootLength("file://server/path") === 14 // "file://server/"
+     * getRootLength("http://server") === 13      // "http://server"
+     * getRootLength("http://server/path") === 14 // "http://server/"
+     * ```
+     */
+    function getRootLength(path) {
+        var rootLength = getEncodedRootLength(path);
+        return rootLength < 0 ? ~rootLength : rootLength;
+    }
+    ts.getRootLength = getRootLength;
+    // TODO(rbuckton): replace references with `resolvePath`
+    function normalizePath(path) {
+        return resolvePath(path);
+    }
+    ts.normalizePath = normalizePath;
+    function normalizePathAndParts(path) {
+        path = normalizeSlashes(path);
+        var _a = reducePathComponents(getPathComponents(path)), root = _a[0], parts = _a.slice(1);
+        if (parts.length) {
+            var joinedParts = root + parts.join(ts.directorySeparator);
+            return { path: hasTrailingDirectorySeparator(path) ? ensureTrailingDirectorySeparator(joinedParts) : joinedParts, parts: parts };
+        }
+        else {
+            return { path: root, parts: parts };
+        }
+    }
+    ts.normalizePathAndParts = normalizePathAndParts;
+    function getDirectoryPath(path) {
+        path = normalizeSlashes(path);
+        // If the path provided is itself the root, then return it.
+        var rootLength = getRootLength(path);
+        if (rootLength === path.length)
+            return path;
+        // return the leading portion of the path up to the last (non-terminal) directory separator
+        // but not including any trailing directory separator.
+        path = removeTrailingDirectorySeparator(path);
+        return path.slice(0, Math.max(rootLength, path.lastIndexOf(ts.directorySeparator)));
+    }
+    ts.getDirectoryPath = getDirectoryPath;
+    function isUrl(path) {
+        return getEncodedRootLength(path) < 0;
+    }
+    ts.isUrl = isUrl;
+    function pathIsRelative(path) {
+        return /^\.\.?($|[\\/])/.test(path);
+    }
+    ts.pathIsRelative = pathIsRelative;
+    /**
+     * Determines whether a path is an absolute path (e.g. starts with `/`, or a dos path
+     * like `c:`, `c:\` or `c:/`).
+     */
+    function isRootedDiskPath(path) {
+        return getEncodedRootLength(path) > 0;
+    }
+    ts.isRootedDiskPath = isRootedDiskPath;
+    /**
+     * Determines whether a path consists only of a path root.
+     */
+    function isDiskPathRoot(path) {
+        var rootLength = getEncodedRootLength(path);
+        return rootLength > 0 && rootLength === path.length;
+    }
+    ts.isDiskPathRoot = isDiskPathRoot;
+    function convertToRelativePath(absoluteOrRelativePath, basePath, getCanonicalFileName) {
+        return !isRootedDiskPath(absoluteOrRelativePath)
+            ? absoluteOrRelativePath
+            : getRelativePathToDirectoryOrUrl(basePath, absoluteOrRelativePath, basePath, getCanonicalFileName, /*isAbsolutePathAnUrl*/ false);
+    }
+    ts.convertToRelativePath = convertToRelativePath;
+    function pathComponents(path, rootLength) {
+        var root = path.substring(0, rootLength);
+        var rest = path.substring(rootLength).split(ts.directorySeparator);
+        if (rest.length && !ts.lastOrUndefined(rest))
+            rest.pop();
+        return [root].concat(rest);
+    }
+    /**
+     * Parse a path into an array containing a root component (at index 0) and zero or more path
+     * components (at indices > 0). The result is not normalized.
+     * If the path is relative, the root component is `""`.
+     * If the path is absolute, the root component includes the first path separator (`/`).
+     */
+    function getPathComponents(path, currentDirectory) {
+        if (currentDirectory === void 0) { currentDirectory = ""; }
+        path = combinePaths(currentDirectory, path);
+        var rootLength = getRootLength(path);
+        return pathComponents(path, rootLength);
+    }
+    ts.getPathComponents = getPathComponents;
+    /**
+     * Reduce an array of path components to a more simplified path by navigating any
+     * `"."` or `".."` entries in the path.
+     */
+    function reducePathComponents(components) {
+        if (!ts.some(components))
+            return [];
+        var reduced = [components[0]];
+        for (var i = 1; i < components.length; i++) {
+            var component = components[i];
+            if (!component)
+                continue;
+            if (component === ".")
+                continue;
+            if (component === "..") {
+                if (reduced.length > 1) {
+                    if (reduced[reduced.length - 1] !== "..") {
+                        reduced.pop();
+                        continue;
+                    }
+                }
+                else if (reduced[0])
+                    continue;
+            }
+            reduced.push(component);
+        }
+        return reduced;
+    }
+    ts.reducePathComponents = reducePathComponents;
+    /**
+     * Parse a path into an array containing a root component (at index 0) and zero or more path
+     * components (at indices > 0). The result is normalized.
+     * If the path is relative, the root component is `""`.
+     * If the path is absolute, the root component includes the first path separator (`/`).
+     */
+    function getNormalizedPathComponents(path, currentDirectory) {
+        return reducePathComponents(getPathComponents(path, currentDirectory));
+    }
+    ts.getNormalizedPathComponents = getNormalizedPathComponents;
+    function getNormalizedAbsolutePath(fileName, currentDirectory) {
+        return getPathFromPathComponents(getNormalizedPathComponents(fileName, currentDirectory));
+    }
+    ts.getNormalizedAbsolutePath = getNormalizedAbsolutePath;
+    /**
+     * Formats a parsed path consisting of a root component (at index 0) and zero or more path
+     * segments (at indices > 0).
+     */
+    function getPathFromPathComponents(pathComponents) {
+        if (pathComponents.length === 0)
+            return "";
+        var root = pathComponents[0] && ensureTrailingDirectorySeparator(pathComponents[0]);
+        if (pathComponents.length === 1)
+            return root;
+        return root + pathComponents.slice(1).join(ts.directorySeparator);
+    }
+    ts.getPathFromPathComponents = getPathFromPathComponents;
+    function getPathComponentsRelativeTo(from, to, stringEqualityComparer, getCanonicalFileName) {
+        var fromComponents = reducePathComponents(getPathComponents(from));
+        var toComponents = reducePathComponents(getPathComponents(to));
+        var start;
+        for (start = 0; start < fromComponents.length && start < toComponents.length; start++) {
+            var fromComponent = getCanonicalFileName(fromComponents[start]);
+            var toComponent = getCanonicalFileName(toComponents[start]);
+            var comparer = start === 0 ? ts.equateStringsCaseInsensitive : stringEqualityComparer;
+            if (!comparer(fromComponent, toComponent))
+                break;
+        }
+        if (start === 0) {
+            return toComponents;
+        }
+        var components = toComponents.slice(start);
+        var relative = [];
+        for (; start < fromComponents.length; start++) {
+            relative.push("..");
+        }
+        return [""].concat(relative, components);
+    }
+    function getRelativePathFromFile(from, to, getCanonicalFileName) {
+        return ensurePathIsNonModuleName(getRelativePathFromDirectory(getDirectoryPath(from), to, getCanonicalFileName));
+    }
+    ts.getRelativePathFromFile = getRelativePathFromFile;
+    function getRelativePathFromDirectory(fromDirectory, to, getCanonicalFileNameOrIgnoreCase) {
+        Debug.assert((getRootLength(fromDirectory) > 0) === (getRootLength(to) > 0), "Paths must either both be absolute or both be relative");
+        var getCanonicalFileName = typeof getCanonicalFileNameOrIgnoreCase === "function" ? getCanonicalFileNameOrIgnoreCase : ts.identity;
+        var ignoreCase = typeof getCanonicalFileNameOrIgnoreCase === "boolean" ? getCanonicalFileNameOrIgnoreCase : false;
+        var pathComponents = getPathComponentsRelativeTo(fromDirectory, to, ignoreCase ? ts.equateStringsCaseInsensitive : ts.equateStringsCaseSensitive, getCanonicalFileName);
+        return getPathFromPathComponents(pathComponents);
+    }
+    ts.getRelativePathFromDirectory = getRelativePathFromDirectory;
+    function getRelativePathToDirectoryOrUrl(directoryPathOrUrl, relativeOrAbsolutePath, currentDirectory, getCanonicalFileName, isAbsolutePathAnUrl) {
+        var pathComponents = getPathComponentsRelativeTo(resolvePath(currentDirectory, directoryPathOrUrl), resolvePath(currentDirectory, relativeOrAbsolutePath), ts.equateStringsCaseSensitive, getCanonicalFileName);
+        var firstComponent = pathComponents[0];
+        if (isAbsolutePathAnUrl && isRootedDiskPath(firstComponent)) {
+            var prefix = firstComponent.charAt(0) === ts.directorySeparator ? "file://" : "file:///";
+            pathComponents[0] = prefix + firstComponent;
+        }
+        return getPathFromPathComponents(pathComponents);
+    }
+    ts.getRelativePathToDirectoryOrUrl = getRelativePathToDirectoryOrUrl;
+    /**
+     * Ensures a path is either absolute (prefixed with `/` or `c:`) or dot-relative (prefixed
+     * with `./` or `../`) so as not to be confused with an unprefixed module name.
+     */
+    function ensurePathIsNonModuleName(path) {
+        return getRootLength(path) === 0 && !pathIsRelative(path) ? "./" + path : path;
+    }
+    ts.ensurePathIsNonModuleName = ensurePathIsNonModuleName;
+    function getBaseFileName(path, extensions, ignoreCase) {
+        path = normalizeSlashes(path);
+        // if the path provided is itself the root, then it has not file name.
+        var rootLength = getRootLength(path);
+        if (rootLength === path.length)
+            return "";
+        // return the trailing portion of the path starting after the last (non-terminal) directory
+        // separator but not including any trailing directory separator.
+        path = removeTrailingDirectorySeparator(path);
+        var name = path.slice(Math.max(getRootLength(path), path.lastIndexOf(ts.directorySeparator) + 1));
+        var extension = extensions !== undefined && ignoreCase !== undefined ? getAnyExtensionFromPath(name, extensions, ignoreCase) : undefined;
+        return extension ? name.slice(0, name.length - extension.length) : name;
+    }
+    ts.getBaseFileName = getBaseFileName;
+    /**
+     * Combines paths. If a path is absolute, it replaces any previous path.
+     */
+    function combinePaths(path) {
+        var paths = [];
+        for (var _i = 1; _i < arguments.length; _i++) {
+            paths[_i - 1] = arguments[_i];
+        }
+        if (path)
+            path = normalizeSlashes(path);
+        for (var _a = 0, paths_1 = paths; _a < paths_1.length; _a++) {
+            var relativePath = paths_1[_a];
+            if (!relativePath)
+                continue;
+            relativePath = normalizeSlashes(relativePath);
+            if (!path || getRootLength(relativePath) !== 0) {
+                path = relativePath;
+            }
+            else {
+                path = ensureTrailingDirectorySeparator(path) + relativePath;
+            }
+        }
+        return path;
+    }
+    ts.combinePaths = combinePaths;
+    /**
+     * Combines and resolves paths. If a path is absolute, it replaces any previous path. Any
+     * `.` and `..` path components are resolved.
+     */
+    function resolvePath(path) {
+        var paths = [];
+        for (var _i = 1; _i < arguments.length; _i++) {
+            paths[_i - 1] = arguments[_i];
+        }
+        var combined = ts.some(paths) ? combinePaths.apply(void 0, [path].concat(paths)) : normalizeSlashes(path);
+        var normalized = getPathFromPathComponents(reducePathComponents(getPathComponents(combined)));
+        return normalized && hasTrailingDirectorySeparator(combined) ? ensureTrailingDirectorySeparator(normalized) : normalized;
+    }
+    ts.resolvePath = resolvePath;
+    /**
+     * Determines whether a path has a trailing separator (`/` or `\\`).
+     */
+    function hasTrailingDirectorySeparator(path) {
+        if (path.length === 0)
+            return false;
+        var ch = path.charCodeAt(path.length - 1);
+        return ch === 47 /* slash */ || ch === 92 /* backslash */;
+    }
+    ts.hasTrailingDirectorySeparator = hasTrailingDirectorySeparator;
+    function removeTrailingDirectorySeparator(path) {
+        if (hasTrailingDirectorySeparator(path)) {
+            return path.substr(0, path.length - 1);
+        }
+        return path;
+    }
+    ts.removeTrailingDirectorySeparator = removeTrailingDirectorySeparator;
+    function ensureTrailingDirectorySeparator(path) {
+        if (!hasTrailingDirectorySeparator(path)) {
+            return path + ts.directorySeparator;
+        }
+        return path;
+    }
+    ts.ensureTrailingDirectorySeparator = ensureTrailingDirectorySeparator;
+    function comparePathsWorker(a, b, componentComparer) {
+        if (a === b)
+            return 0 /* EqualTo */;
+        if (a === undefined)
+            return -1 /* LessThan */;
+        if (b === undefined)
+            return 1 /* GreaterThan */;
+        var aComponents = reducePathComponents(getPathComponents(a));
+        var bComponents = reducePathComponents(getPathComponents(b));
+        var sharedLength = Math.min(aComponents.length, bComponents.length);
+        for (var i = 0; i < sharedLength; i++) {
+            var stringComparer = i === 0 ? ts.compareStringsCaseInsensitive : componentComparer;
+            var result = stringComparer(aComponents[i], bComponents[i]);
+            if (result !== 0 /* EqualTo */) {
+                return result;
+            }
+        }
+        return ts.compareValues(aComponents.length, bComponents.length);
+    }
+    /**
+     * Performs a case-sensitive comparison of two paths.
+     */
+    function comparePathsCaseSensitive(a, b) {
+        return comparePathsWorker(a, b, ts.compareStringsCaseSensitive);
+    }
+    ts.comparePathsCaseSensitive = comparePathsCaseSensitive;
+    /**
+     * Performs a case-insensitive comparison of two paths.
+     */
+    function comparePathsCaseInsensitive(a, b) {
+        return comparePathsWorker(a, b, ts.compareStringsCaseInsensitive);
+    }
+    ts.comparePathsCaseInsensitive = comparePathsCaseInsensitive;
+    function comparePaths(a, b, currentDirectory, ignoreCase) {
+        if (typeof currentDirectory === "string") {
+            a = combinePaths(currentDirectory, a);
+            b = combinePaths(currentDirectory, b);
+        }
+        else if (typeof currentDirectory === "boolean") {
+            ignoreCase = currentDirectory;
+        }
+        return comparePathsWorker(a, b, ts.getStringComparer(ignoreCase));
+    }
+    ts.comparePaths = comparePaths;
+    function containsPath(parent, child, currentDirectory, ignoreCase) {
+        if (typeof currentDirectory === "string") {
+            parent = combinePaths(currentDirectory, parent);
+            child = combinePaths(currentDirectory, child);
+        }
+        else if (typeof currentDirectory === "boolean") {
+            ignoreCase = currentDirectory;
+        }
+        if (parent === undefined || child === undefined)
+            return false;
+        if (parent === child)
+            return true;
+        var parentComponents = reducePathComponents(getPathComponents(parent));
+        var childComponents = reducePathComponents(getPathComponents(child));
+        if (childComponents.length < parentComponents.length) {
+            return false;
+        }
+        var componentEqualityComparer = ignoreCase ? ts.equateStringsCaseInsensitive : ts.equateStringsCaseSensitive;
+        for (var i = 0; i < parentComponents.length; i++) {
+            var equalityComparer = i === 0 ? ts.equateStringsCaseInsensitive : componentEqualityComparer;
+            if (!equalityComparer(parentComponents[i], childComponents[i])) {
+                return false;
+            }
+        }
+        return true;
+    }
+    ts.containsPath = containsPath;
+    function tryRemoveDirectoryPrefix(path, dirPath) {
+        var a = ts.tryRemovePrefix(path, dirPath);
+        if (a === undefined)
+            return undefined;
+        switch (a.charCodeAt(0)) {
+            case 47 /* slash */:
+            case 92 /* backslash */:
+                return a.slice(1);
+            default:
+                return undefined;
+        }
+    }
+    ts.tryRemoveDirectoryPrefix = tryRemoveDirectoryPrefix;
+    // Reserved characters, forces escaping of any non-word (or digit), non-whitespace character.
+    // It may be inefficient (we could just match (/[-[\]{}()*+?.,\\^$|#\s]/g), but this is future
+    // proof.
+    var reservedCharacterPattern = /[^\w\s\/]/g;
+    var wildcardCharCodes = [42 /* asterisk */, 63 /* question */];
+    function hasExtension(fileName) {
+        return ts.stringContains(getBaseFileName(fileName), ".");
+    }
+    ts.hasExtension = hasExtension;
+    ts.commonPackageFolders = ["node_modules", "bower_components", "jspm_packages"];
+    var implicitExcludePathRegexPattern = "(?!(" + ts.commonPackageFolders.join("|") + ")(/|$))";
+    var filesMatcher = {
+        /**
+         * Matches any single directory segment unless it is the last segment and a .min.js file
+         * Breakdown:
+         *  [^./]                   # matches everything up to the first . character (excluding directory separators)
+         *  (\\.(?!min\\.js$))?     # matches . characters but not if they are part of the .min.js file extension
+         */
+        singleAsteriskRegexFragment: "([^./]|(\\.(?!min\\.js$))?)*",
+        /**
+         * Regex for the ** wildcard. Matches any number of subdirectories. When used for including
+         * files or directories, does not match subdirectories that start with a . character
+         */
+        doubleAsteriskRegexFragment: "(/" + implicitExcludePathRegexPattern + "[^/.][^/]*)*?",
+        replaceWildcardCharacter: function (match) { return replaceWildcardCharacter(match, filesMatcher.singleAsteriskRegexFragment); }
+    };
+    var directoriesMatcher = {
+        singleAsteriskRegexFragment: "[^/]*",
+        /**
+         * Regex for the ** wildcard. Matches any number of subdirectories. When used for including
+         * files or directories, does not match subdirectories that start with a . character
+         */
+        doubleAsteriskRegexFragment: "(/" + implicitExcludePathRegexPattern + "[^/.][^/]*)*?",
+        replaceWildcardCharacter: function (match) { return replaceWildcardCharacter(match, directoriesMatcher.singleAsteriskRegexFragment); }
+    };
+    var excludeMatcher = {
+        singleAsteriskRegexFragment: "[^/]*",
+        doubleAsteriskRegexFragment: "(/.+?)?",
+        replaceWildcardCharacter: function (match) { return replaceWildcardCharacter(match, excludeMatcher.singleAsteriskRegexFragment); }
+    };
+    var wildcardMatchers = {
+        files: filesMatcher,
+        directories: directoriesMatcher,
+        exclude: excludeMatcher
+    };
+    function getRegularExpressionForWildcard(specs, basePath, usage) {
+        var patterns = getRegularExpressionsForWildcards(specs, basePath, usage);
+        if (!patterns || !patterns.length) {
+            return undefined;
+        }
+        var pattern = patterns.map(function (pattern) { return "(" + pattern + ")"; }).join("|");
+        // If excluding, match "foo/bar/baz...", but if including, only allow "foo".
+        var terminator = usage === "exclude" ? "($|/)" : "$";
+        return "^(" + pattern + ")" + terminator;
+    }
+    ts.getRegularExpressionForWildcard = getRegularExpressionForWildcard;
+    function getRegularExpressionsForWildcards(specs, basePath, usage) {
+        if (specs === undefined || specs.length === 0) {
+            return undefined;
+        }
+        return ts.flatMap(specs, function (spec) {
+            return spec && getSubPatternFromSpec(spec, basePath, usage, wildcardMatchers[usage]);
+        });
+    }
+    /**
+     * An "includes" path "foo" is implicitly a glob "foo/** /*" (without the space) if its last component has no extension,
+     * and does not contain any glob characters itself.
+     */
+    function isImplicitGlob(lastPathComponent) {
+        return !/[.*?]/.test(lastPathComponent);
+    }
+    ts.isImplicitGlob = isImplicitGlob;
+    function getSubPatternFromSpec(spec, basePath, usage, _a) {
+        var singleAsteriskRegexFragment = _a.singleAsteriskRegexFragment, doubleAsteriskRegexFragment = _a.doubleAsteriskRegexFragment, replaceWildcardCharacter = _a.replaceWildcardCharacter;
+        var subpattern = "";
+        var hasWrittenComponent = false;
+        var components = getNormalizedPathComponents(spec, basePath);
+        var lastComponent = ts.last(components);
+        if (usage !== "exclude" && lastComponent === "**") {
+            return undefined;
+        }
+        // getNormalizedPathComponents includes the separator for the root component.
+        // We need to remove to create our regex correctly.
+        components[0] = removeTrailingDirectorySeparator(components[0]);
+        if (isImplicitGlob(lastComponent)) {
+            components.push("**", "*");
+        }
+        var optionalCount = 0;
+        for (var _i = 0, components_1 = components; _i < components_1.length; _i++) {
+            var component = components_1[_i];
+            if (component === "**") {
+                subpattern += doubleAsteriskRegexFragment;
+            }
+            else {
+                if (usage === "directories") {
+                    subpattern += "(";
+                    optionalCount++;
+                }
+                if (hasWrittenComponent) {
+                    subpattern += ts.directorySeparator;
+                }
+                if (usage !== "exclude") {
+                    var componentPattern = "";
+                    // The * and ? wildcards should not match directories or files that start with . if they
+                    // appear first in a component. Dotted directories and files can be included explicitly
+                    // like so: **/.*/.*
+                    if (component.charCodeAt(0) === 42 /* asterisk */) {
+                        componentPattern += "([^./]" + singleAsteriskRegexFragment + ")?";
+                        component = component.substr(1);
+                    }
+                    else if (component.charCodeAt(0) === 63 /* question */) {
+                        componentPattern += "[^./]";
+                        component = component.substr(1);
+                    }
+                    componentPattern += component.replace(reservedCharacterPattern, replaceWildcardCharacter);
+                    // Patterns should not include subfolders like node_modules unless they are
+                    // explicitly included as part of the path.
+                    //
+                    // As an optimization, if the component pattern is the same as the component,
+                    // then there definitely were no wildcard characters and we do not need to
+                    // add the exclusion pattern.
+                    if (componentPattern !== component) {
+                        subpattern += implicitExcludePathRegexPattern;
+                    }
+                    subpattern += componentPattern;
+                }
+                else {
+                    subpattern += component.replace(reservedCharacterPattern, replaceWildcardCharacter);
+                }
+            }
+            hasWrittenComponent = true;
+        }
+        while (optionalCount > 0) {
+            subpattern += ")?";
+            optionalCount--;
+        }
+        return subpattern;
+    }
+    function replaceWildcardCharacter(match, singleAsteriskRegexFragment) {
+        return match === "*" ? singleAsteriskRegexFragment : match === "?" ? "[^/]" : "\\" + match;
+    }
+    /** @param path directory of the tsconfig.json */
+    function getFileMatcherPatterns(path, excludes, includes, useCaseSensitiveFileNames, currentDirectory) {
+        path = normalizePath(path);
+        currentDirectory = normalizePath(currentDirectory);
+        var absolutePath = combinePaths(currentDirectory, path);
+        return {
+            includeFilePatterns: ts.map(getRegularExpressionsForWildcards(includes, absolutePath, "files"), function (pattern) { return "^" + pattern + "$"; }),
+            includeFilePattern: getRegularExpressionForWildcard(includes, absolutePath, "files"),
+            includeDirectoryPattern: getRegularExpressionForWildcard(includes, absolutePath, "directories"),
+            excludePattern: getRegularExpressionForWildcard(excludes, absolutePath, "exclude"),
+            basePaths: getBasePaths(path, includes, useCaseSensitiveFileNames)
+        };
+    }
+    ts.getFileMatcherPatterns = getFileMatcherPatterns;
+    function getRegexFromPattern(pattern, useCaseSensitiveFileNames) {
+        return new RegExp(pattern, useCaseSensitiveFileNames ? "" : "i");
+    }
+    ts.getRegexFromPattern = getRegexFromPattern;
+    /** @param path directory of the tsconfig.json */
+    function matchFiles(path, extensions, excludes, includes, useCaseSensitiveFileNames, currentDirectory, depth, getFileSystemEntries) {
+        path = normalizePath(path);
+        currentDirectory = normalizePath(currentDirectory);
+        var patterns = getFileMatcherPatterns(path, excludes, includes, useCaseSensitiveFileNames, currentDirectory);
+        var includeFileRegexes = patterns.includeFilePatterns && patterns.includeFilePatterns.map(function (pattern) { return getRegexFromPattern(pattern, useCaseSensitiveFileNames); });
+        var includeDirectoryRegex = patterns.includeDirectoryPattern && getRegexFromPattern(patterns.includeDirectoryPattern, useCaseSensitiveFileNames);
+        var excludeRegex = patterns.excludePattern && getRegexFromPattern(patterns.excludePattern, useCaseSensitiveFileNames);
+        // Associate an array of results with each include regex. This keeps results in order of the "include" order.
+        // If there are no "includes", then just put everything in results[0].
+        var results = includeFileRegexes ? includeFileRegexes.map(function () { return []; }) : [[]];
+        for (var _i = 0, _a = patterns.basePaths; _i < _a.length; _i++) {
+            var basePath = _a[_i];
+            visitDirectory(basePath, combinePaths(currentDirectory, basePath), depth);
+        }
+        return ts.flatten(results);
+        function visitDirectory(path, absolutePath, depth) {
+            var _a = getFileSystemEntries(path), files = _a.files, directories = _a.directories;
+            var _loop_1 = function (current) {
+                var name = combinePaths(path, current);
+                var absoluteName = combinePaths(absolutePath, current);
+                if (extensions && !ts.fileExtensionIsOneOf(name, extensions))
+                    return "continue";
+                if (excludeRegex && excludeRegex.test(absoluteName))
+                    return "continue";
+                if (!includeFileRegexes) {
+                    results[0].push(name);
+                }
+                else {
+                    var includeIndex = ts.findIndex(includeFileRegexes, function (re) { return re.test(absoluteName); });
+                    if (includeIndex !== -1) {
+                        results[includeIndex].push(name);
+                    }
+                }
+            };
+            for (var _i = 0, _b = ts.sort(files, ts.compareStringsCaseSensitive); _i < _b.length; _i++) {
+                var current = _b[_i];
+                _loop_1(current);
+            }
+            if (depth !== undefined) {
+                depth--;
+                if (depth === 0) {
+                    return;
+                }
+            }
+            for (var _c = 0, _d = ts.sort(directories, ts.compareStringsCaseSensitive); _c < _d.length; _c++) {
+                var current = _d[_c];
+                var name = combinePaths(path, current);
+                var absoluteName = combinePaths(absolutePath, current);
+                if ((!includeDirectoryRegex || includeDirectoryRegex.test(absoluteName)) &&
+                    (!excludeRegex || !excludeRegex.test(absoluteName))) {
+                    visitDirectory(name, absoluteName, depth);
+                }
+            }
+        }
+    }
+    ts.matchFiles = matchFiles;
+    /**
+     * Computes the unique non-wildcard base paths amongst the provided include patterns.
+     */
+    function getBasePaths(path, includes, useCaseSensitiveFileNames) {
+        // Storage for our results in the form of literal paths (e.g. the paths as written by the user).
+        var basePaths = [path];
+        if (includes) {
+            // Storage for literal base paths amongst the include patterns.
+            var includeBasePaths = [];
+            for (var _i = 0, includes_1 = includes; _i < includes_1.length; _i++) {
+                var include = includes_1[_i];
+                // We also need to check the relative paths by converting them to absolute and normalizing
+                // in case they escape the base path (e.g "..\somedirectory")
+                var absolute = isRootedDiskPath(include) ? include : normalizePath(combinePaths(path, include));
+                // Append the literal and canonical candidate base paths.
+                includeBasePaths.push(getIncludeBasePath(absolute));
+            }
+            // Sort the offsets array using either the literal or canonical path representations.
+            includeBasePaths.sort(ts.getStringComparer(!useCaseSensitiveFileNames));
+            var _loop_2 = function (includeBasePath) {
+                if (ts.every(basePaths, function (basePath) { return !containsPath(basePath, includeBasePath, path, !useCaseSensitiveFileNames); })) {
+                    basePaths.push(includeBasePath);
+                }
+            };
+            // Iterate over each include base path and include unique base paths that are not a
+            // subpath of an existing base path
+            for (var _a = 0, includeBasePaths_1 = includeBasePaths; _a < includeBasePaths_1.length; _a++) {
+                var includeBasePath = includeBasePaths_1[_a];
+                _loop_2(includeBasePath);
+            }
+        }
+        return basePaths;
+    }
+    function getIncludeBasePath(absolute) {
+        var wildcardOffset = ts.indexOfAnyCharCode(absolute, wildcardCharCodes);
+        if (wildcardOffset < 0) {
+            // No "*" or "?" in the path
+            return !hasExtension(absolute)
+                ? absolute
+                : removeTrailingDirectorySeparator(getDirectoryPath(absolute));
+        }
+        return absolute.substring(0, absolute.lastIndexOf(ts.directorySeparator, wildcardOffset));
+    }
+    function ensureScriptKind(fileName, scriptKind) {
+        // Using scriptKind as a condition handles both:
+        // - 'scriptKind' is unspecified and thus it is `undefined`
+        // - 'scriptKind' is set and it is `Unknown` (0)
+        // If the 'scriptKind' is 'undefined' or 'Unknown' then we attempt
+        // to get the ScriptKind from the file name. If it cannot be resolved
+        // from the file name then the default 'TS' script kind is returned.
+        return scriptKind || getScriptKindFromFileName(fileName) || 3 /* TS */;
+    }
+    ts.ensureScriptKind = ensureScriptKind;
+    function getScriptKindFromFileName(fileName) {
+        var ext = fileName.substr(fileName.lastIndexOf("."));
+        switch (ext.toLowerCase()) {
+            case ".js" /* Js */:
+                return 1 /* JS */;
+            case ".jsx" /* Jsx */:
+                return 2 /* JSX */;
+            case ".ts" /* Ts */:
+                return 3 /* TS */;
+            case ".tsx" /* Tsx */:
+                return 4 /* TSX */;
+            case ".json" /* Json */:
+                return 6 /* JSON */;
+            default:
+                return 0 /* Unknown */;
+        }
+    }
+    ts.getScriptKindFromFileName = getScriptKindFromFileName;
+    /**
+     *  List of supported extensions in order of file resolution precedence.
+     */
+    ts.supportedTypeScriptExtensions = [".ts" /* Ts */, ".tsx" /* Tsx */, ".d.ts" /* Dts */];
+    /** Must have ".d.ts" first because if ".ts" goes first, that will be detected as the extension instead of ".d.ts". */
+    ts.supportedTypescriptExtensionsForExtractExtension = [".d.ts" /* Dts */, ".ts" /* Ts */, ".tsx" /* Tsx */];
+    ts.supportedJavascriptExtensions = [".js" /* Js */, ".jsx" /* Jsx */];
+    var allSupportedExtensions = ts.supportedTypeScriptExtensions.concat(ts.supportedJavascriptExtensions);
+    function getSupportedExtensions(options, extraFileExtensions) {
+        var needJsExtensions = options && options.allowJs;
+        if (!extraFileExtensions || extraFileExtensions.length === 0) {
+            return needJsExtensions ? allSupportedExtensions : ts.supportedTypeScriptExtensions;
+        }
+        var extensions = (needJsExtensions ? allSupportedExtensions : ts.supportedTypeScriptExtensions).concat(ts.mapDefined(extraFileExtensions, function (x) { return x.scriptKind === 7 /* Deferred */ || needJsExtensions && isJavaScriptLike(x.scriptKind) ? x.extension : undefined; }));
+        return ts.deduplicate(extensions, ts.equateStringsCaseSensitive, ts.compareStringsCaseSensitive);
+    }
+    ts.getSupportedExtensions = getSupportedExtensions;
+    function isJavaScriptLike(scriptKind) {
+        return scriptKind === 1 /* JS */ || scriptKind === 2 /* JSX */;
+    }
+    function hasJavaScriptFileExtension(fileName) {
+        return ts.some(ts.supportedJavascriptExtensions, function (extension) { return ts.fileExtensionIs(fileName, extension); });
+    }
+    ts.hasJavaScriptFileExtension = hasJavaScriptFileExtension;
+    function hasTypeScriptFileExtension(fileName) {
+        return ts.some(ts.supportedTypeScriptExtensions, function (extension) { return ts.fileExtensionIs(fileName, extension); });
+    }
+    ts.hasTypeScriptFileExtension = hasTypeScriptFileExtension;
+    function isSupportedSourceFileName(fileName, compilerOptions, extraFileExtensions) {
+        if (!fileName) {
+            return false;
+        }
+        for (var _i = 0, _a = getSupportedExtensions(compilerOptions, extraFileExtensions); _i < _a.length; _i++) {
+            var extension = _a[_i];
+            if (ts.fileExtensionIs(fileName, extension)) {
+                return true;
+            }
+        }
+        return false;
+    }
+    ts.isSupportedSourceFileName = isSupportedSourceFileName;
+    /**
+     * Extension boundaries by priority. Lower numbers indicate higher priorities, and are
+     * aligned to the offset of the highest priority extension in the
+     * allSupportedExtensions array.
+     */
+    var ExtensionPriority;
+    (function (ExtensionPriority) {
+        ExtensionPriority[ExtensionPriority["TypeScriptFiles"] = 0] = "TypeScriptFiles";
+        ExtensionPriority[ExtensionPriority["DeclarationAndJavaScriptFiles"] = 2] = "DeclarationAndJavaScriptFiles";
+        ExtensionPriority[ExtensionPriority["Highest"] = 0] = "Highest";
+        ExtensionPriority[ExtensionPriority["Lowest"] = 2] = "Lowest";
+    })(ExtensionPriority = ts.ExtensionPriority || (ts.ExtensionPriority = {}));
+    function getExtensionPriority(path, supportedExtensions) {
+        for (var i = supportedExtensions.length - 1; i >= 0; i--) {
+            if (ts.fileExtensionIs(path, supportedExtensions[i])) {
+                return adjustExtensionPriority(i, supportedExtensions);
+            }
+        }
+        // If its not in the list of supported extensions, this is likely a
+        // TypeScript file with a non-ts extension
+        return 0 /* Highest */;
+    }
+    ts.getExtensionPriority = getExtensionPriority;
+    /**
+     * Adjusts an extension priority to be the highest priority within the same range.
+     */
+    function adjustExtensionPriority(extensionPriority, supportedExtensions) {
+        if (extensionPriority < 2 /* DeclarationAndJavaScriptFiles */) {
+            return 0 /* TypeScriptFiles */;
+        }
+        else if (extensionPriority < supportedExtensions.length) {
+            return 2 /* DeclarationAndJavaScriptFiles */;
+        }
+        else {
+            return supportedExtensions.length;
+        }
+    }
+    ts.adjustExtensionPriority = adjustExtensionPriority;
+    /**
+     * Gets the next lowest extension priority for a given priority.
+     */
+    function getNextLowestExtensionPriority(extensionPriority, supportedExtensions) {
+        if (extensionPriority < 2 /* DeclarationAndJavaScriptFiles */) {
+            return 2 /* DeclarationAndJavaScriptFiles */;
+        }
+        else {
+            return supportedExtensions.length;
+        }
+    }
+    ts.getNextLowestExtensionPriority = getNextLowestExtensionPriority;
+    var extensionsToRemove = [".d.ts" /* Dts */, ".ts" /* Ts */, ".js" /* Js */, ".tsx" /* Tsx */, ".jsx" /* Jsx */, ".json" /* Json */];
+    function removeFileExtension(path) {
+        for (var _i = 0, extensionsToRemove_1 = extensionsToRemove; _i < extensionsToRemove_1.length; _i++) {
+            var ext = extensionsToRemove_1[_i];
+            var extensionless = tryRemoveExtension(path, ext);
+            if (extensionless !== undefined) {
+                return extensionless;
+            }
+        }
+        return path;
+    }
+    ts.removeFileExtension = removeFileExtension;
+    function tryRemoveExtension(path, extension) {
+        return ts.fileExtensionIs(path, extension) ? removeExtension(path, extension) : undefined;
+    }
+    ts.tryRemoveExtension = tryRemoveExtension;
+    function removeExtension(path, extension) {
+        return path.substring(0, path.length - extension.length);
+    }
+    ts.removeExtension = removeExtension;
+    function changeExtension(path, newExtension) {
+        return changeAnyExtension(path, newExtension, extensionsToRemove, /*ignoreCase*/ false);
+    }
+    ts.changeExtension = changeExtension;
+    function changeAnyExtension(path, ext, extensions, ignoreCase) {
+        var pathext = extensions !== undefined && ignoreCase !== undefined ? getAnyExtensionFromPath(path, extensions, ignoreCase) : getAnyExtensionFromPath(path);
+        return pathext ? path.slice(0, path.length - pathext.length) + (ts.startsWith(ext, ".") ? ext : "." + ext) : path;
+    }
+    ts.changeAnyExtension = changeAnyExtension;
+    var Debug;
+    (function (Debug) {
+        function showSymbol(symbol) {
+            var symbolFlags = ts.SymbolFlags;
+            return "{ flags: " + (symbolFlags ? showFlags(symbol.flags, symbolFlags) : symbol.flags) + "; declarations: " + ts.map(symbol.declarations, showSyntaxKind) + " }";
+        }
+        Debug.showSymbol = showSymbol;
+        function showFlags(flags, flagsEnum) {
+            var out = [];
+            for (var pow = 0; pow <= 30; pow++) {
+                var n = 1 << pow;
+                if (flags & n) {
+                    out.push(flagsEnum[n]);
+                }
+            }
+            return out.join("|");
+        }
+        function showSyntaxKind(node) {
+            var syntaxKind = ts.SyntaxKind;
+            return syntaxKind ? syntaxKind[node.kind] : node.kind.toString();
+        }
+        Debug.showSyntaxKind = showSyntaxKind;
+    })(Debug = ts.Debug || (ts.Debug = {}));
+    function tryParsePattern(pattern) {
+        // This should be verified outside of here and a proper error thrown.
+        Debug.assert(hasZeroOrOneAsteriskCharacter(pattern));
+        var indexOfStar = pattern.indexOf("*");
+        return indexOfStar === -1 ? undefined : {
+            prefix: pattern.substr(0, indexOfStar),
+            suffix: pattern.substr(indexOfStar + 1)
+        };
+    }
+    ts.tryParsePattern = tryParsePattern;
+    function positionIsSynthesized(pos) {
+        // This is a fast way of testing the following conditions:
+        //  pos === undefined || pos === null || isNaN(pos) || pos < 0;
+        return !(pos >= 0);
+    }
+    ts.positionIsSynthesized = positionIsSynthesized;
+    /** True if an extension is one of the supported TypeScript extensions. */
+    function extensionIsTypeScript(ext) {
+        return ext === ".ts" /* Ts */ || ext === ".tsx" /* Tsx */ || ext === ".d.ts" /* Dts */;
+    }
+    ts.extensionIsTypeScript = extensionIsTypeScript;
+    function resolutionExtensionIsTypeScriptOrJson(ext) {
+        return extensionIsTypeScript(ext) || ext === ".json" /* Json */;
+    }
+    ts.resolutionExtensionIsTypeScriptOrJson = resolutionExtensionIsTypeScriptOrJson;
+    /**
+     * Gets the extension from a path.
+     * Path must have a valid extension.
+     */
+    function extensionFromPath(path) {
+        var ext = tryGetExtensionFromPath(path);
+        return ext !== undefined ? ext : Debug.fail("File " + path + " has unknown extension.");
+    }
+    ts.extensionFromPath = extensionFromPath;
+    function isAnySupportedFileExtension(path) {
+        return tryGetExtensionFromPath(path) !== undefined;
+    }
+    ts.isAnySupportedFileExtension = isAnySupportedFileExtension;
+    function tryGetExtensionFromPath(path) {
+        return ts.find(ts.supportedTypescriptExtensionsForExtractExtension, function (e) { return ts.fileExtensionIs(path, e); }) || ts.find(ts.supportedJavascriptExtensions, function (e) { return ts.fileExtensionIs(path, e); });
+    }
+    ts.tryGetExtensionFromPath = tryGetExtensionFromPath;
+    function getAnyExtensionFromPathWorker(path, extensions, stringEqualityComparer) {
+        if (typeof extensions === "string")
+            extensions = [extensions];
+        for (var _i = 0, extensions_1 = extensions; _i < extensions_1.length; _i++) {
+            var extension = extensions_1[_i];
+            if (!ts.startsWith(extension, "."))
+                extension = "." + extension;
+            if (path.length >= extension.length && path.charAt(path.length - extension.length) === ".") {
+                var pathExtension = path.slice(path.length - extension.length);
+                if (stringEqualityComparer(pathExtension, extension)) {
+                    return pathExtension;
+                }
+            }
+        }
+        return "";
+    }
+    function getAnyExtensionFromPath(path, extensions, ignoreCase) {
+        // Retrieves any string from the final "." onwards from a base file name.
+        // Unlike extensionFromPath, which throws an exception on unrecognized extensions.
+        if (extensions) {
+            return getAnyExtensionFromPathWorker(path, extensions, ignoreCase ? ts.equateStringsCaseInsensitive : ts.equateStringsCaseSensitive);
+        }
+        var baseFileName = getBaseFileName(path);
+        var extensionIndex = baseFileName.lastIndexOf(".");
+        if (extensionIndex >= 0) {
+            return baseFileName.substring(extensionIndex);
+        }
+        return "";
+    }
+    ts.getAnyExtensionFromPath = getAnyExtensionFromPath;
+    function isCheckJsEnabledForFile(sourceFile, compilerOptions) {
+        return sourceFile.checkJsDirective ? sourceFile.checkJsDirective.enabled : compilerOptions.checkJs;
+    }
+    ts.isCheckJsEnabledForFile = isCheckJsEnabledForFile;
+    ts.emptyFileSystemEntries = {
+        files: ts.emptyArray,
+        directories: ts.emptyArray
+    };
+    /**
+     * patternStrings contains both pattern strings (containing "*") and regular strings.
+     * Return an exact match if possible, or a pattern match, or undefined.
+     * (These are verified by verifyCompilerOptions to have 0 or 1 "*" characters.)
+     */
+    function matchPatternOrExact(patternStrings, candidate) {
+        var patterns = [];
+        for (var _i = 0, patternStrings_1 = patternStrings; _i < patternStrings_1.length; _i++) {
+            var patternString = patternStrings_1[_i];
+            var pattern = tryParsePattern(patternString);
+            if (pattern) {
+                patterns.push(pattern);
+            }
+            else if (patternString === candidate) {
+                // pattern was matched as is - no need to search further
+                return patternString;
+            }
+        }
+        return ts.findBestPatternMatch(patterns, function (_) { return _; }, candidate);
+    }
+    ts.matchPatternOrExact = matchPatternOrExact;
 })(ts || (ts = {}));
 var ts;
 (function (ts) {
@@ -14788,7 +14937,6 @@ var ts;
         SignatureFlags[SignatureFlags["Yield"] = 1] = "Yield";
         SignatureFlags[SignatureFlags["Await"] = 2] = "Await";
         SignatureFlags[SignatureFlags["Type"] = 4] = "Type";
-        SignatureFlags[SignatureFlags["RequireCompleteParameterList"] = 8] = "RequireCompleteParameterList";
         SignatureFlags[SignatureFlags["IgnoreMissingOpenBrace"] = 16] = "IgnoreMissingOpenBrace";
         SignatureFlags[SignatureFlags["JSDoc"] = 32] = "JSDoc";
     })(SignatureFlags || (SignatureFlags = {}));
@@ -15943,8 +16091,8 @@ var ts;
                 kind === 71 /* Identifier */ ? new IdentifierConstructor(kind, p, p) :
                     new TokenConstructor(kind, p, p);
         }
-        function createNodeWithJSDoc(kind) {
-            var node = createNode(kind);
+        function createNodeWithJSDoc(kind, pos) {
+            var node = createNode(kind, pos);
             if (scanner.getTokenFlags() & 2 /* PrecedingJSDocComment */) {
                 addJSDocComment(node);
             }
@@ -16800,6 +16948,23 @@ var ts;
             }
             return finishNode(node);
         }
+        // If true, we should abort parsing an error function.
+        function typeHasArrowFunctionBlockingParseError(node) {
+            switch (node.kind) {
+                case 162 /* TypeReference */:
+                    return ts.nodeIsMissing(node.typeName);
+                case 163 /* FunctionType */:
+                case 164 /* ConstructorType */: {
+                    var _a = node, parameters = _a.parameters, type = _a.type;
+                    // parameters.pos === parameters.end only if we used parseMissingList, else should contain at least `()`
+                    return parameters.pos === parameters.end || typeHasArrowFunctionBlockingParseError(type);
+                }
+                case 173 /* ParenthesizedType */:
+                    return typeHasArrowFunctionBlockingParseError(node.type);
+                default:
+                    return false;
+            }
+        }
         function parseThisTypePredicate(lhs) {
             nextToken();
             var node = createNode(161 /* TypePredicate */, lhs.pos);
@@ -16970,18 +17135,20 @@ var ts;
             return finishNode(node);
         }
         /**
+         * Note: If returnToken is EqualsGreaterThanToken, `signature.type` will always be defined.
          * @returns If return type parsing succeeds
          */
         function fillSignature(returnToken, flags, signature) {
             if (!(flags & 32 /* JSDoc */)) {
                 signature.typeParameters = parseTypeParameters();
             }
-            signature.parameters = parseParameterList(flags); // TODO: GH#18217
+            var parametersParsedSuccessfully = parseParameterList(signature, flags);
             if (shouldParseReturnType(returnToken, !!(flags & 4 /* Type */))) {
                 signature.type = parseTypeOrTypePredicate();
-                return signature.type !== undefined;
+                if (typeHasArrowFunctionBlockingParseError(signature.type))
+                    return false;
             }
-            return true;
+            return parametersParsedSuccessfully;
         }
         function shouldParseReturnType(returnToken, isType) {
             if (returnToken === 36 /* EqualsGreaterThanToken */) {
@@ -16999,7 +17166,8 @@ var ts;
             }
             return false;
         }
-        function parseParameterList(flags) {
+        // Returns true on success.
+        function parseParameterList(signature, flags) {
             // FormalParameters [Yield,Await]: (modified)
             //      [empty]
             //      FormalParameterList[?Yield,Await]
@@ -17013,25 +17181,18 @@ var ts;
             //
             // SingleNameBinding [Yield,Await]:
             //      BindingIdentifier[?Yield,?Await]Initializer [In, ?Yield,?Await] opt
-            if (parseExpected(19 /* OpenParenToken */)) {
-                var savedYieldContext = inYieldContext();
-                var savedAwaitContext = inAwaitContext();
-                setYieldContext(!!(flags & 1 /* Yield */));
-                setAwaitContext(!!(flags & 2 /* Await */));
-                var result = parseDelimitedList(16 /* Parameters */, flags & 32 /* JSDoc */ ? parseJSDocParameter : parseParameter);
-                setYieldContext(savedYieldContext);
-                setAwaitContext(savedAwaitContext);
-                if (!parseExpected(20 /* CloseParenToken */) && (flags & 8 /* RequireCompleteParameterList */)) {
-                    // Caller insisted that we had to end with a )   We didn't.  So just return
-                    // undefined here.
-                    return undefined;
-                }
-                return result;
+            if (!parseExpected(19 /* OpenParenToken */)) {
+                signature.parameters = createMissingList();
+                return false;
             }
-            // We didn't even have an open paren.  If the caller requires a complete parameter list,
-            // we definitely can't provide that.  However, if they're ok with an incomplete one,
-            // then just return an empty set of parameters.
-            return (flags & 8 /* RequireCompleteParameterList */) ? undefined : createMissingList();
+            var savedYieldContext = inYieldContext();
+            var savedAwaitContext = inAwaitContext();
+            setYieldContext(!!(flags & 1 /* Yield */));
+            setAwaitContext(!!(flags & 2 /* Await */));
+            signature.parameters = parseDelimitedList(16 /* Parameters */, flags & 32 /* JSDoc */ ? parseJSDocParameter : parseParameter);
+            setYieldContext(savedYieldContext);
+            setAwaitContext(savedAwaitContext);
+            return parseExpected(20 /* CloseParenToken */);
         }
         function parseTypeMemberSemicolon() {
             // We allow type members to be separated by commas or (possibly ASI) semicolons.
@@ -17260,23 +17421,14 @@ var ts;
             var node = createNode(173 /* ParenthesizedType */);
             parseExpected(19 /* OpenParenToken */);
             node.type = parseType();
-            if (!node.type) {
-                return undefined; // TODO: GH#18217
-            }
             parseExpected(20 /* CloseParenToken */);
             return finishNode(node);
         }
-        function parseFunctionOrConstructorType(kind) {
-            var node = createNodeWithJSDoc(kind);
-            if (kind === 164 /* ConstructorType */) {
-                parseExpected(94 /* NewKeyword */);
-            }
-            if (!fillSignature(36 /* EqualsGreaterThanToken */, 4 /* Type */ | (sourceFile.languageVariant === 1 /* JSX */ ? 8 /* RequireCompleteParameterList */ : 0), node)) {
-                return undefined;
-            }
-            if (!node.parameters) {
-                return undefined;
-            }
+        function parseFunctionOrConstructorType() {
+            var pos = getNodePos();
+            var kind = parseOptional(94 /* NewKeyword */) ? 164 /* ConstructorType */ : 163 /* FunctionType */;
+            var node = createNodeWithJSDoc(kind, pos);
+            fillSignature(36 /* EqualsGreaterThanToken */, 4 /* Type */, node);
             return finishNode(node);
         }
         function parseKeywordAndNoDot() {
@@ -17594,11 +17746,8 @@ var ts;
             return doOutsideOfContext(20480 /* TypeExcludesFlags */, parseTypeWorker);
         }
         function parseTypeWorker(noConditionalTypes) {
-            if (isStartOfFunctionType()) {
-                return parseFunctionOrConstructorType(163 /* FunctionType */); // TODO: GH#18217
-            }
-            if (token() === 94 /* NewKeyword */) {
-                return parseFunctionOrConstructorType(164 /* ConstructorType */);
+            if (isStartOfFunctionType() || token() === 94 /* NewKeyword */) {
+                return parseFunctionOrConstructorType();
             }
             var type = parseUnionTypeOrHigher();
             if (!noConditionalTypes && !scanner.hasPrecedingLineBreak() && parseOptional(85 /* ExtendsKeyword */)) {
@@ -18029,11 +18178,7 @@ var ts;
             // a => (b => c)
             // And think that "(b =>" was actually a parenthesized arrow function with a missing
             // close paren.
-            if (!fillSignature(56 /* ColonToken */, isAsync | (allowAmbiguity ? 0 /* None */ : 8 /* RequireCompleteParameterList */), node)) {
-                return undefined;
-            }
-            // If we couldn't get parameters, we definitely could not parse out an arrow function.
-            if (!node.parameters) {
+            if (!fillSignature(56 /* ColonToken */, isAsync, node) && !allowAmbiguity) {
                 return undefined;
             }
             // Parsing a signature isn't enough.
@@ -20581,51 +20726,39 @@ var ts;
                     nextJSDocToken();
                     var tagName = parseJSDocIdentifierName();
                     skipWhitespace();
-                    if (!tagName) {
-                        return;
-                    }
                     var tag;
-                    if (tagName) {
-                        switch (tagName.escapedText) {
-                            case "augments":
-                            case "extends":
-                                tag = parseAugmentsTag(atToken, tagName);
-                                break;
-                            case "class":
-                            case "constructor":
-                                tag = parseClassTag(atToken, tagName);
-                                break;
-                            case "arg":
-                            case "argument":
-                            case "param":
-                                return parseParameterOrPropertyTag(atToken, tagName, 2 /* Parameter */, indent);
-                            case "return":
-                            case "returns":
-                                tag = parseReturnTag(atToken, tagName);
-                                break;
-                            case "template":
-                                tag = parseTemplateTag(atToken, tagName);
-                                break;
-                            case "type":
-                                tag = parseTypeTag(atToken, tagName);
-                                break;
-                            case "typedef":
-                                tag = parseTypedefTag(atToken, tagName, indent);
-                                break;
-                            case "callback":
-                                tag = parseCallbackTag(atToken, tagName, indent);
-                                break;
-                            default:
-                                tag = parseUnknownTag(atToken, tagName);
-                                break;
-                        }
-                    }
-                    else {
-                        tag = parseUnknownTag(atToken, tagName);
-                    }
-                    if (!tag) {
-                        // a badly malformed tag should not be added to the list of tags
-                        return;
+                    switch (tagName.escapedText) {
+                        case "augments":
+                        case "extends":
+                            tag = parseAugmentsTag(atToken, tagName);
+                            break;
+                        case "class":
+                        case "constructor":
+                            tag = parseClassTag(atToken, tagName);
+                            break;
+                        case "arg":
+                        case "argument":
+                        case "param":
+                            return parseParameterOrPropertyTag(atToken, tagName, 2 /* Parameter */, indent);
+                        case "return":
+                        case "returns":
+                            tag = parseReturnTag(atToken, tagName);
+                            break;
+                        case "template":
+                            tag = parseTemplateTag(atToken, tagName);
+                            break;
+                        case "type":
+                            tag = parseTypeTag(atToken, tagName);
+                            break;
+                        case "typedef":
+                            tag = parseTypedefTag(atToken, tagName, indent);
+                            break;
+                        case "callback":
+                            tag = parseCallbackTag(atToken, tagName, indent);
+                            break;
+                        default:
+                            tag = parseUnknownTag(atToken, tagName);
+                            break;
                     }
                     if (!tag.comment) {
                         // some tags, like typedef and callback, have already parsed their comments earlier
@@ -20835,11 +20968,11 @@ var ts;
                     return res;
                 }
                 function parsePropertyAccessEntityNameExpression() {
-                    var node = parseJSDocIdentifierName(/*createIfMissing*/ true);
+                    var node = parseJSDocIdentifierName();
                     while (parseOptional(23 /* DotToken */)) {
                         var prop = createNode(185 /* PropertyAccessExpression */, node.pos);
                         prop.expression = node;
-                        prop.name = parseJSDocIdentifierName(); // TODO: GH#18217
+                        prop.name = parseJSDocIdentifierName();
                         node = finishNode(prop);
                     }
                     return node;
@@ -20898,8 +21031,11 @@ var ts;
                 }
                 function parseJSDocTypeNameWithNamespace(nested) {
                     var pos = scanner.getTokenPos();
+                    if (!ts.tokenIsIdentifierOrKeyword(token())) {
+                        return undefined;
+                    }
                     var typeNameOrNamespaceName = parseJSDocIdentifierName();
-                    if (typeNameOrNamespaceName && parseOptional(23 /* DotToken */)) {
+                    if (parseOptional(23 /* DotToken */)) {
                         var jsDocNamespaceNode = createNode(239 /* ModuleDeclaration */, pos);
                         if (nested) {
                             jsDocNamespaceNode.flags |= 4 /* NestedNamespace */;
@@ -20908,7 +21044,7 @@ var ts;
                         jsDocNamespaceNode.body = parseJSDocTypeNameWithNamespace(/*nested*/ true);
                         return finishNode(jsDocNamespaceNode);
                     }
-                    if (typeNameOrNamespaceName && nested) {
+                    if (nested) {
                         typeNameOrNamespaceName.isInJSDocNamespace = true;
                     }
                     return typeNameOrNamespaceName;
@@ -21010,9 +21146,6 @@ var ts;
                     nextJSDocToken();
                     var tagName = parseJSDocIdentifierName();
                     skipWhitespace();
-                    if (!tagName) {
-                        return false;
-                    }
                     var t;
                     switch (tagName.escapedText) {
                         case "type":
@@ -21047,11 +21180,7 @@ var ts;
                     do {
                         skipWhitespace();
                         var typeParameter = createNode(148 /* TypeParameter */);
-                        if (!ts.tokenIsIdentifierOrKeyword(token())) {
-                            parseErrorAtCurrentToken(ts.Diagnostics.Unexpected_token_A_type_parameter_name_was_expected_without_curly_braces);
-                            return undefined;
-                        }
-                        typeParameter.name = parseJSDocIdentifierName();
+                        typeParameter.name = parseJSDocIdentifierName(ts.Diagnostics.Unexpected_token_A_type_parameter_name_was_expected_without_curly_braces);
                         skipWhitespace();
                         finishNode(typeParameter);
                         typeParameters.push(typeParameter);
@@ -21077,7 +21206,7 @@ var ts;
                     return false;
                 }
                 function parseJSDocEntityName() {
-                    var entity = parseJSDocIdentifierName(/*createIfMissing*/ true);
+                    var entity = parseJSDocIdentifierName();
                     if (parseOptional(21 /* OpenBracketToken */)) {
                         parseExpected(22 /* CloseBracketToken */);
                         // Note that y[] is accepted as an entity name, but the postfix brackets are not saved for checking.
@@ -21085,7 +21214,7 @@ var ts;
                         // but it's not worth it to enforce that restriction.
                     }
                     while (parseOptional(23 /* DotToken */)) {
-                        var name = parseJSDocIdentifierName(/*createIfMissing*/ true);
+                        var name = parseJSDocIdentifierName();
                         if (parseOptional(21 /* OpenBracketToken */)) {
                             parseExpected(22 /* CloseBracketToken */);
                         }
@@ -21093,16 +21222,9 @@ var ts;
                     }
                     return entity;
                 }
-                function parseJSDocIdentifierName(createIfMissing) {
-                    if (createIfMissing === void 0) { createIfMissing = false; }
+                function parseJSDocIdentifierName(message) {
                     if (!ts.tokenIsIdentifierOrKeyword(token())) {
-                        if (createIfMissing) {
-                            return createMissingNode(71 /* Identifier */, /*reportAtCurrentPosition*/ true, ts.Diagnostics.Identifier_expected);
-                        }
-                        else {
-                            parseErrorAtCurrentToken(ts.Diagnostics.Identifier_expected);
-                            return undefined;
-                        }
+                        return createMissingNode(71 /* Identifier */, /*reportAtCurrentPosition*/ !message, message || ts.Diagnostics.Identifier_expected);
                     }
                     var pos = scanner.getTokenPos();
                     var end = scanner.getTextPos();
@@ -21224,8 +21346,8 @@ var ts;
                 array._children = undefined;
                 array.pos += delta;
                 array.end += delta;
-                for (var _i = 0, array_8 = array; _i < array_8.length; _i++) {
-                    var node = array_8[_i];
+                for (var _i = 0, array_1 = array; _i < array_1.length; _i++) {
+                    var node = array_1[_i];
                     visitNode(node);
                 }
             }
@@ -21375,8 +21497,8 @@ var ts;
                     array._children = undefined;
                     // Adjust the pos or end (or both) of the intersecting array accordingly.
                     adjustIntersectingElement(array, changeStart, changeRangeOldEnd, changeRangeNewEnd, delta);
-                    for (var _i = 0, array_9 = array; _i < array_9.length; _i++) {
-                        var node = array_9[_i];
+                    for (var _i = 0, array_2 = array; _i < array_2.length; _i++) {
+                        var node = array_2[_i];
                         visitNode(node);
                     }
                     return;
@@ -21639,6 +21761,7 @@ var ts;
         context.checkJsDirective = undefined;
         context.referencedFiles = [];
         context.typeReferenceDirectives = [];
+        context.libReferenceDirectives = [];
         context.amdDependencies = [];
         context.hasNoDefaultLib = false;
         context.pragmas.forEach(function (entryOrList, key) {
@@ -21648,6 +21771,7 @@ var ts;
                 case "reference": {
                     var referencedFiles_1 = context.referencedFiles;
                     var typeReferenceDirectives_1 = context.typeReferenceDirectives;
+                    var libReferenceDirectives_1 = context.libReferenceDirectives;
                     ts.forEach(ts.toArray(entryOrList), function (arg) {
                         // TODO: GH#18217
                         if (arg.arguments["no-default-lib"]) {
@@ -21656,6 +21780,9 @@ var ts;
                         else if (arg.arguments.types) {
                             typeReferenceDirectives_1.push({ pos: arg.arguments.types.pos, end: arg.arguments.types.end, fileName: arg.arguments.types.value });
                         }
+                        else if (arg.arguments.lib) {
+                            libReferenceDirectives_1.push({ pos: arg.arguments.lib.pos, end: arg.arguments.lib.end, fileName: arg.arguments.lib.value });
+                        }
                         else if (arg.arguments.path) {
                             referencedFiles_1.push({ pos: arg.arguments.path.pos, end: arg.arguments.path.end, fileName: arg.arguments.path.value });
                         }
@@ -21819,6 +21946,3408 @@ var ts;
     }
     ts.tagNamesAreEquivalent = tagNamesAreEquivalent;
 })(ts || (ts = {}));
+var ts;
+(function (ts) {
+    /* @internal */
+    ts.compileOnSaveCommandLineOption = { name: "compileOnSave", type: "boolean" };
+    // NOTE: The order here is important to default lib ordering as entries will have the same
+    //       order in the generated program (see `getDefaultLibPriority` in program.ts). This
+    //       order also affects overload resolution when a type declared in one lib is
+    //       augmented in another lib.
+    var libEntries = [
+        // JavaScript only
+        ["es5", "lib.es5.d.ts"],
+        ["es6", "lib.es2015.d.ts"],
+        ["es2015", "lib.es2015.d.ts"],
+        ["es7", "lib.es2016.d.ts"],
+        ["es2016", "lib.es2016.d.ts"],
+        ["es2017", "lib.es2017.d.ts"],
+        ["es2018", "lib.es2018.d.ts"],
+        ["esnext", "lib.esnext.d.ts"],
+        // Host only
+        ["dom", "lib.dom.d.ts"],
+        ["dom.iterable", "lib.dom.iterable.d.ts"],
+        ["webworker", "lib.webworker.d.ts"],
+        ["webworker.importscripts", "lib.webworker.importscripts.d.ts"],
+        ["scripthost", "lib.scripthost.d.ts"],
+        // ES2015 Or ESNext By-feature options
+        ["es2015.core", "lib.es2015.core.d.ts"],
+        ["es2015.collection", "lib.es2015.collection.d.ts"],
+        ["es2015.generator", "lib.es2015.generator.d.ts"],
+        ["es2015.iterable", "lib.es2015.iterable.d.ts"],
+        ["es2015.promise", "lib.es2015.promise.d.ts"],
+        ["es2015.proxy", "lib.es2015.proxy.d.ts"],
+        ["es2015.reflect", "lib.es2015.reflect.d.ts"],
+        ["es2015.symbol", "lib.es2015.symbol.d.ts"],
+        ["es2015.symbol.wellknown", "lib.es2015.symbol.wellknown.d.ts"],
+        ["es2016.array.include", "lib.es2016.array.include.d.ts"],
+        ["es2017.object", "lib.es2017.object.d.ts"],
+        ["es2017.sharedmemory", "lib.es2017.sharedmemory.d.ts"],
+        ["es2017.string", "lib.es2017.string.d.ts"],
+        ["es2017.intl", "lib.es2017.intl.d.ts"],
+        ["es2017.typedarrays", "lib.es2017.typedarrays.d.ts"],
+        ["es2018.intl", "lib.es2018.intl.d.ts"],
+        ["es2018.promise", "lib.es2018.promise.d.ts"],
+        ["es2018.regexp", "lib.es2018.regexp.d.ts"],
+        ["esnext.array", "lib.esnext.array.d.ts"],
+        ["esnext.symbol", "lib.esnext.symbol.d.ts"],
+        ["esnext.asynciterable", "lib.esnext.asynciterable.d.ts"],
+    ];
+    /**
+     * An array of supported "lib" reference file names used to determine the order for inclusion
+     * when referenced, as well as for spelling suggestions. This ensures the correct ordering for
+     * overload resolution when a type declared in one lib is extended by another.
+     */
+    /* @internal */
+    ts.libs = libEntries.map(function (entry) { return entry[0]; });
+    /**
+     * A map of lib names to lib files. This map is used both for parsing the "lib" command line
+     * option as well as for resolving lib reference directives.
+     */
+    /* @internal */
+    ts.libMap = ts.createMapFromEntries(libEntries);
+    /* @internal */
+    ts.optionDeclarations = [
+        // CommandLine only options
+        {
+            name: "help",
+            shortName: "h",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Command_line_Options,
+            description: ts.Diagnostics.Print_this_message,
+        },
+        {
+            name: "help",
+            shortName: "?",
+            type: "boolean"
+        },
+        {
+            name: "all",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Command_line_Options,
+            description: ts.Diagnostics.Show_all_compiler_options,
+        },
+        {
+            name: "version",
+            shortName: "v",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Command_line_Options,
+            description: ts.Diagnostics.Print_the_compiler_s_version,
+        },
+        {
+            name: "init",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Command_line_Options,
+            description: ts.Diagnostics.Initializes_a_TypeScript_project_and_creates_a_tsconfig_json_file,
+        },
+        {
+            name: "project",
+            shortName: "p",
+            type: "string",
+            isFilePath: true,
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Command_line_Options,
+            paramType: ts.Diagnostics.FILE_OR_DIRECTORY,
+            description: ts.Diagnostics.Compile_the_project_given_the_path_to_its_configuration_file_or_to_a_folder_with_a_tsconfig_json,
+        },
+        {
+            name: "build",
+            type: "boolean",
+            shortName: "b",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Command_line_Options,
+            description: ts.Diagnostics.Build_one_or_more_projects_and_their_dependencies_if_out_of_date
+        },
+        {
+            name: "pretty",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Command_line_Options,
+            description: ts.Diagnostics.Stylize_errors_and_messages_using_color_and_context_experimental
+        },
+        {
+            name: "preserveWatchOutput",
+            type: "boolean",
+            showInSimplifiedHelpView: false,
+            category: ts.Diagnostics.Command_line_Options,
+            description: ts.Diagnostics.Whether_to_keep_outdated_console_output_in_watch_mode_instead_of_clearing_the_screen,
+        },
+        {
+            name: "watch",
+            shortName: "w",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Command_line_Options,
+            description: ts.Diagnostics.Watch_input_files,
+        },
+        // Basic
+        {
+            name: "target",
+            shortName: "t",
+            type: ts.createMapFromTemplate({
+                es3: 0 /* ES3 */,
+                es5: 1 /* ES5 */,
+                es6: 2 /* ES2015 */,
+                es2015: 2 /* ES2015 */,
+                es2016: 3 /* ES2016 */,
+                es2017: 4 /* ES2017 */,
+                es2018: 5 /* ES2018 */,
+                esnext: 6 /* ESNext */,
+            }),
+            paramType: ts.Diagnostics.VERSION,
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Specify_ECMAScript_target_version_Colon_ES3_default_ES5_ES2015_ES2016_ES2017_ES2018_or_ESNEXT,
+        },
+        {
+            name: "module",
+            shortName: "m",
+            type: ts.createMapFromTemplate({
+                none: ts.ModuleKind.None,
+                commonjs: ts.ModuleKind.CommonJS,
+                amd: ts.ModuleKind.AMD,
+                system: ts.ModuleKind.System,
+                umd: ts.ModuleKind.UMD,
+                es6: ts.ModuleKind.ES2015,
+                es2015: ts.ModuleKind.ES2015,
+                esnext: ts.ModuleKind.ESNext
+            }),
+            paramType: ts.Diagnostics.KIND,
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Specify_module_code_generation_Colon_none_commonjs_amd_system_umd_es2015_or_ESNext,
+        },
+        {
+            name: "lib",
+            type: "list",
+            element: {
+                name: "lib",
+                type: ts.libMap
+            },
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Specify_library_files_to_be_included_in_the_compilation
+        },
+        {
+            name: "allowJs",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Allow_javascript_files_to_be_compiled
+        },
+        {
+            name: "checkJs",
+            type: "boolean",
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Report_errors_in_js_files
+        },
+        {
+            name: "jsx",
+            type: ts.createMapFromTemplate({
+                "preserve": 1 /* Preserve */,
+                "react-native": 3 /* ReactNative */,
+                "react": 2 /* React */
+            }),
+            paramType: ts.Diagnostics.KIND,
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Specify_JSX_code_generation_Colon_preserve_react_native_or_react,
+        },
+        {
+            name: "declaration",
+            shortName: "d",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Generates_corresponding_d_ts_file,
+        },
+        {
+            name: "declarationMap",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Generates_a_sourcemap_for_each_corresponding_d_ts_file,
+        },
+        {
+            name: "emitDeclarationOnly",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Only_emit_d_ts_declaration_files,
+        },
+        {
+            name: "sourceMap",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Generates_corresponding_map_file,
+        },
+        {
+            name: "outFile",
+            type: "string",
+            isFilePath: true,
+            paramType: ts.Diagnostics.FILE,
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Concatenate_and_emit_output_to_single_file,
+        },
+        {
+            name: "outDir",
+            type: "string",
+            isFilePath: true,
+            paramType: ts.Diagnostics.DIRECTORY,
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Redirect_output_structure_to_the_directory,
+        },
+        {
+            name: "rootDir",
+            type: "string",
+            isFilePath: true,
+            paramType: ts.Diagnostics.LOCATION,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Specify_the_root_directory_of_input_files_Use_to_control_the_output_directory_structure_with_outDir,
+        },
+        {
+            name: "composite",
+            type: "boolean",
+            isTSConfigOnly: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Enable_project_compilation,
+        },
+        {
+            name: "removeComments",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Do_not_emit_comments_to_output,
+        },
+        {
+            name: "noEmit",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Do_not_emit_outputs,
+        },
+        {
+            name: "importHelpers",
+            type: "boolean",
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Import_emit_helpers_from_tslib
+        },
+        {
+            name: "downlevelIteration",
+            type: "boolean",
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Provide_full_support_for_iterables_in_for_of_spread_and_destructuring_when_targeting_ES5_or_ES3
+        },
+        {
+            name: "isolatedModules",
+            type: "boolean",
+            category: ts.Diagnostics.Basic_Options,
+            description: ts.Diagnostics.Transpile_each_file_as_a_separate_module_similar_to_ts_transpileModule
+        },
+        // Strict Type Checks
+        {
+            name: "strict",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Strict_Type_Checking_Options,
+            description: ts.Diagnostics.Enable_all_strict_type_checking_options
+        },
+        {
+            name: "noImplicitAny",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Strict_Type_Checking_Options,
+            description: ts.Diagnostics.Raise_error_on_expressions_and_declarations_with_an_implied_any_type,
+        },
+        {
+            name: "strictNullChecks",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Strict_Type_Checking_Options,
+            description: ts.Diagnostics.Enable_strict_null_checks
+        },
+        {
+            name: "strictFunctionTypes",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Strict_Type_Checking_Options,
+            description: ts.Diagnostics.Enable_strict_checking_of_function_types
+        },
+        {
+            name: "strictPropertyInitialization",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Strict_Type_Checking_Options,
+            description: ts.Diagnostics.Enable_strict_checking_of_property_initialization_in_classes
+        },
+        {
+            name: "noImplicitThis",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Strict_Type_Checking_Options,
+            description: ts.Diagnostics.Raise_error_on_this_expressions_with_an_implied_any_type,
+        },
+        {
+            name: "alwaysStrict",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Strict_Type_Checking_Options,
+            description: ts.Diagnostics.Parse_in_strict_mode_and_emit_use_strict_for_each_source_file
+        },
+        // Additional Checks
+        {
+            name: "noUnusedLocals",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Additional_Checks,
+            description: ts.Diagnostics.Report_errors_on_unused_locals,
+        },
+        {
+            name: "noUnusedParameters",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Additional_Checks,
+            description: ts.Diagnostics.Report_errors_on_unused_parameters,
+        },
+        {
+            name: "noImplicitReturns",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Additional_Checks,
+            description: ts.Diagnostics.Report_error_when_not_all_code_paths_in_function_return_a_value
+        },
+        {
+            name: "noFallthroughCasesInSwitch",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Additional_Checks,
+            description: ts.Diagnostics.Report_errors_for_fallthrough_cases_in_switch_statement
+        },
+        // Module Resolution
+        {
+            name: "moduleResolution",
+            type: ts.createMapFromTemplate({
+                node: ts.ModuleResolutionKind.NodeJs,
+                classic: ts.ModuleResolutionKind.Classic,
+            }),
+            paramType: ts.Diagnostics.STRATEGY,
+            category: ts.Diagnostics.Module_Resolution_Options,
+            description: ts.Diagnostics.Specify_module_resolution_strategy_Colon_node_Node_js_or_classic_TypeScript_pre_1_6,
+        },
+        {
+            name: "baseUrl",
+            type: "string",
+            isFilePath: true,
+            category: ts.Diagnostics.Module_Resolution_Options,
+            description: ts.Diagnostics.Base_directory_to_resolve_non_absolute_module_names
+        },
+        {
+            // this option can only be specified in tsconfig.json
+            // use type = object to copy the value as-is
+            name: "paths",
+            type: "object",
+            isTSConfigOnly: true,
+            category: ts.Diagnostics.Module_Resolution_Options,
+            description: ts.Diagnostics.A_series_of_entries_which_re_map_imports_to_lookup_locations_relative_to_the_baseUrl
+        },
+        {
+            // this option can only be specified in tsconfig.json
+            // use type = object to copy the value as-is
+            name: "rootDirs",
+            type: "list",
+            isTSConfigOnly: true,
+            element: {
+                name: "rootDirs",
+                type: "string",
+                isFilePath: true
+            },
+            category: ts.Diagnostics.Module_Resolution_Options,
+            description: ts.Diagnostics.List_of_root_folders_whose_combined_content_represents_the_structure_of_the_project_at_runtime
+        },
+        {
+            name: "typeRoots",
+            type: "list",
+            element: {
+                name: "typeRoots",
+                type: "string",
+                isFilePath: true
+            },
+            category: ts.Diagnostics.Module_Resolution_Options,
+            description: ts.Diagnostics.List_of_folders_to_include_type_definitions_from
+        },
+        {
+            name: "types",
+            type: "list",
+            element: {
+                name: "types",
+                type: "string"
+            },
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Module_Resolution_Options,
+            description: ts.Diagnostics.Type_declaration_files_to_be_included_in_compilation
+        },
+        {
+            name: "allowSyntheticDefaultImports",
+            type: "boolean",
+            category: ts.Diagnostics.Module_Resolution_Options,
+            description: ts.Diagnostics.Allow_default_imports_from_modules_with_no_default_export_This_does_not_affect_code_emit_just_typechecking
+        },
+        {
+            name: "esModuleInterop",
+            type: "boolean",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Module_Resolution_Options,
+            description: ts.Diagnostics.Enables_emit_interoperability_between_CommonJS_and_ES_Modules_via_creation_of_namespace_objects_for_all_imports_Implies_allowSyntheticDefaultImports
+        },
+        {
+            name: "preserveSymlinks",
+            type: "boolean",
+            category: ts.Diagnostics.Module_Resolution_Options,
+            description: ts.Diagnostics.Do_not_resolve_the_real_path_of_symlinks,
+        },
+        // Source Maps
+        {
+            name: "sourceRoot",
+            type: "string",
+            isFilePath: true,
+            paramType: ts.Diagnostics.LOCATION,
+            category: ts.Diagnostics.Source_Map_Options,
+            description: ts.Diagnostics.Specify_the_location_where_debugger_should_locate_TypeScript_files_instead_of_source_locations,
+        },
+        {
+            name: "mapRoot",
+            type: "string",
+            isFilePath: true,
+            paramType: ts.Diagnostics.LOCATION,
+            category: ts.Diagnostics.Source_Map_Options,
+            description: ts.Diagnostics.Specify_the_location_where_debugger_should_locate_map_files_instead_of_generated_locations,
+        },
+        {
+            name: "inlineSourceMap",
+            type: "boolean",
+            category: ts.Diagnostics.Source_Map_Options,
+            description: ts.Diagnostics.Emit_a_single_file_with_source_maps_instead_of_having_a_separate_file
+        },
+        {
+            name: "inlineSources",
+            type: "boolean",
+            category: ts.Diagnostics.Source_Map_Options,
+            description: ts.Diagnostics.Emit_the_source_alongside_the_sourcemaps_within_a_single_file_requires_inlineSourceMap_or_sourceMap_to_be_set
+        },
+        // Experimental
+        {
+            name: "experimentalDecorators",
+            type: "boolean",
+            category: ts.Diagnostics.Experimental_Options,
+            description: ts.Diagnostics.Enables_experimental_support_for_ES7_decorators
+        },
+        {
+            name: "emitDecoratorMetadata",
+            type: "boolean",
+            category: ts.Diagnostics.Experimental_Options,
+            description: ts.Diagnostics.Enables_experimental_support_for_emitting_type_metadata_for_decorators
+        },
+        // Advanced
+        {
+            name: "jsxFactory",
+            type: "string",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Specify_the_JSX_factory_function_to_use_when_targeting_react_JSX_emit_e_g_React_createElement_or_h
+        },
+        {
+            name: "diagnostics",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Show_diagnostic_information
+        },
+        {
+            name: "extendedDiagnostics",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Show_verbose_diagnostic_information
+        },
+        {
+            name: "traceResolution",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Enable_tracing_of_the_name_resolution_process
+        },
+        {
+            name: "resolveJsonModule",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Include_modules_imported_with_json_extension
+        },
+        {
+            name: "listFiles",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Print_names_of_files_part_of_the_compilation
+        },
+        {
+            name: "listEmittedFiles",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Print_names_of_generated_files_part_of_the_compilation
+        },
+        {
+            name: "out",
+            type: "string",
+            isFilePath: false,
+            // for correct behaviour, please use outFile
+            category: ts.Diagnostics.Advanced_Options,
+            paramType: ts.Diagnostics.FILE,
+            description: ts.Diagnostics.Deprecated_Use_outFile_instead_Concatenate_and_emit_output_to_single_file,
+        },
+        {
+            name: "reactNamespace",
+            type: "string",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Deprecated_Use_jsxFactory_instead_Specify_the_object_invoked_for_createElement_when_targeting_react_JSX_emit
+        },
+        {
+            name: "skipDefaultLibCheck",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Deprecated_Use_skipLibCheck_instead_Skip_type_checking_of_default_library_declaration_files
+        },
+        {
+            name: "charset",
+            type: "string",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.The_character_set_of_the_input_files
+        },
+        {
+            name: "emitBOM",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Emit_a_UTF_8_Byte_Order_Mark_BOM_in_the_beginning_of_output_files
+        },
+        {
+            name: "locale",
+            type: "string",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.The_locale_used_when_displaying_messages_to_the_user_e_g_en_us
+        },
+        {
+            name: "newLine",
+            type: ts.createMapFromTemplate({
+                crlf: 0 /* CarriageReturnLineFeed */,
+                lf: 1 /* LineFeed */
+            }),
+            paramType: ts.Diagnostics.NEWLINE,
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Specify_the_end_of_line_sequence_to_be_used_when_emitting_files_Colon_CRLF_dos_or_LF_unix,
+        },
+        {
+            name: "noErrorTruncation",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Do_not_truncate_error_messages
+        },
+        {
+            name: "noLib",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Do_not_include_the_default_library_file_lib_d_ts
+        },
+        {
+            name: "noResolve",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Do_not_add_triple_slash_references_or_imported_modules_to_the_list_of_compiled_files
+        },
+        {
+            name: "stripInternal",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Do_not_emit_declarations_for_code_that_has_an_internal_annotation,
+        },
+        {
+            name: "disableSizeLimit",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Disable_size_limitations_on_JavaScript_projects
+        },
+        {
+            name: "noImplicitUseStrict",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Do_not_emit_use_strict_directives_in_module_output
+        },
+        {
+            name: "noEmitHelpers",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Do_not_generate_custom_helper_functions_like_extends_in_compiled_output
+        },
+        {
+            name: "noEmitOnError",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Do_not_emit_outputs_if_any_errors_were_reported,
+        },
+        {
+            name: "preserveConstEnums",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Do_not_erase_const_enum_declarations_in_generated_code
+        },
+        {
+            name: "declarationDir",
+            type: "string",
+            isFilePath: true,
+            paramType: ts.Diagnostics.DIRECTORY,
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Output_directory_for_generated_declaration_files
+        },
+        {
+            name: "skipLibCheck",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Skip_type_checking_of_declaration_files,
+        },
+        {
+            name: "allowUnusedLabels",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Do_not_report_errors_on_unused_labels
+        },
+        {
+            name: "allowUnreachableCode",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Do_not_report_errors_on_unreachable_code
+        },
+        {
+            name: "suppressExcessPropertyErrors",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Suppress_excess_property_checks_for_object_literals,
+        },
+        {
+            name: "suppressImplicitAnyIndexErrors",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Suppress_noImplicitAny_errors_for_indexing_objects_lacking_index_signatures,
+        },
+        {
+            name: "forceConsistentCasingInFileNames",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Disallow_inconsistently_cased_references_to_the_same_file
+        },
+        {
+            name: "maxNodeModuleJsDepth",
+            type: "number",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.The_maximum_dependency_depth_to_search_under_node_modules_and_load_JavaScript_files
+        },
+        {
+            name: "noStrictGenericChecks",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Disable_strict_checking_of_generic_signatures_in_function_types,
+        },
+        {
+            name: "keyofStringsOnly",
+            type: "boolean",
+            category: ts.Diagnostics.Advanced_Options,
+            description: ts.Diagnostics.Resolve_keyof_to_string_valued_property_names_only_no_numbers_or_symbols,
+        },
+        {
+            // A list of plugins to load in the language service
+            name: "plugins",
+            type: "list",
+            isTSConfigOnly: true,
+            element: {
+                name: "plugin",
+                type: "object"
+            },
+            description: ts.Diagnostics.List_of_language_service_plugins
+        }
+    ];
+    /* @internal */
+    ts.typeAcquisitionDeclarations = [
+        {
+            /* @deprecated typingOptions.enableAutoDiscovery
+             * Use typeAcquisition.enable instead.
+             */
+            name: "enableAutoDiscovery",
+            type: "boolean",
+        },
+        {
+            name: "enable",
+            type: "boolean",
+        },
+        {
+            name: "include",
+            type: "list",
+            element: {
+                name: "include",
+                type: "string"
+            }
+        },
+        {
+            name: "exclude",
+            type: "list",
+            element: {
+                name: "exclude",
+                type: "string"
+            }
+        }
+    ];
+    /* @internal */
+    ts.defaultInitCompilerOptions = {
+        module: ts.ModuleKind.CommonJS,
+        target: 1 /* ES5 */,
+        strict: true,
+        esModuleInterop: true
+    };
+    var optionNameMapCache;
+    /* @internal */
+    function convertEnableAutoDiscoveryToEnable(typeAcquisition) {
+        // Convert deprecated typingOptions.enableAutoDiscovery to typeAcquisition.enable
+        if (typeAcquisition && typeAcquisition.enableAutoDiscovery !== undefined && typeAcquisition.enable === undefined) {
+            return {
+                enable: typeAcquisition.enableAutoDiscovery,
+                include: typeAcquisition.include || [],
+                exclude: typeAcquisition.exclude || []
+            };
+        }
+        return typeAcquisition;
+    }
+    ts.convertEnableAutoDiscoveryToEnable = convertEnableAutoDiscoveryToEnable;
+    function getOptionNameMap() {
+        if (optionNameMapCache) {
+            return optionNameMapCache;
+        }
+        var optionNameMap = ts.createMap();
+        var shortOptionNames = ts.createMap();
+        ts.forEach(ts.optionDeclarations, function (option) {
+            optionNameMap.set(option.name.toLowerCase(), option);
+            if (option.shortName) {
+                shortOptionNames.set(option.shortName, option.name);
+            }
+        });
+        optionNameMapCache = { optionNameMap: optionNameMap, shortOptionNames: shortOptionNames };
+        return optionNameMapCache;
+    }
+    /* @internal */
+    function createCompilerDiagnosticForInvalidCustomType(opt) {
+        return createDiagnosticForInvalidCustomType(opt, ts.createCompilerDiagnostic);
+    }
+    ts.createCompilerDiagnosticForInvalidCustomType = createCompilerDiagnosticForInvalidCustomType;
+    function createDiagnosticForInvalidCustomType(opt, createDiagnostic) {
+        var namesOfType = ts.arrayFrom(opt.type.keys()).map(function (key) { return "'" + key + "'"; }).join(", ");
+        return createDiagnostic(ts.Diagnostics.Argument_for_0_option_must_be_Colon_1, "--" + opt.name, namesOfType);
+    }
+    /* @internal */
+    function parseCustomTypeOption(opt, value, errors) {
+        return convertJsonOptionOfCustomType(opt, trimString(value || ""), errors);
+    }
+    ts.parseCustomTypeOption = parseCustomTypeOption;
+    /* @internal */
+    function parseListTypeOption(opt, value, errors) {
+        if (value === void 0) { value = ""; }
+        value = trimString(value);
+        if (ts.startsWith(value, "-")) {
+            return undefined;
+        }
+        if (value === "") {
+            return [];
+        }
+        var values = value.split(",");
+        switch (opt.element.type) {
+            case "number":
+                return ts.map(values, parseInt);
+            case "string":
+                return ts.map(values, function (v) { return v || ""; });
+            default:
+                return ts.mapDefined(values, function (v) { return parseCustomTypeOption(opt.element, v, errors); });
+        }
+    }
+    ts.parseListTypeOption = parseListTypeOption;
+    function parseCommandLine(commandLine, readFile) {
+        var options = {};
+        var fileNames = [];
+        var projectReferences = undefined;
+        var errors = [];
+        parseStrings(commandLine);
+        return {
+            options: options,
+            fileNames: fileNames,
+            projectReferences: projectReferences,
+            errors: errors
+        };
+        function parseStrings(args) {
+            var i = 0;
+            while (i < args.length) {
+                var s = args[i];
+                i++;
+                if (s.charCodeAt(0) === 64 /* at */) {
+                    parseResponseFile(s.slice(1));
+                }
+                else if (s.charCodeAt(0) === 45 /* minus */) {
+                    var opt = getOptionFromName(s.slice(s.charCodeAt(1) === 45 /* minus */ ? 2 : 1), /*allowShort*/ true);
+                    if (opt) {
+                        if (opt.isTSConfigOnly) {
+                            errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Option_0_can_only_be_specified_in_tsconfig_json_file, opt.name));
+                        }
+                        else {
+                            // Check to see if no argument was provided (e.g. "--locale" is the last command-line argument).
+                            if (!args[i] && opt.type !== "boolean") {
+                                errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Compiler_option_0_expects_an_argument, opt.name));
+                            }
+                            switch (opt.type) {
+                                case "number":
+                                    options[opt.name] = parseInt(args[i]);
+                                    i++;
+                                    break;
+                                case "boolean":
+                                    // boolean flag has optional value true, false, others
+                                    var optValue = args[i];
+                                    options[opt.name] = optValue !== "false";
+                                    // consume next argument as boolean flag value
+                                    if (optValue === "false" || optValue === "true") {
+                                        i++;
+                                    }
+                                    break;
+                                case "string":
+                                    options[opt.name] = args[i] || "";
+                                    i++;
+                                    break;
+                                case "list":
+                                    var result = parseListTypeOption(opt, args[i], errors);
+                                    options[opt.name] = result || [];
+                                    if (result) {
+                                        i++;
+                                    }
+                                    break;
+                                // If not a primitive, the possible types are specified in what is effectively a map of options.
+                                default:
+                                    options[opt.name] = parseCustomTypeOption(opt, args[i], errors);
+                                    i++;
+                                    break;
+                            }
+                        }
+                    }
+                    else {
+                        errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Unknown_compiler_option_0, s));
+                    }
+                }
+                else {
+                    fileNames.push(s);
+                }
+            }
+        }
+        function parseResponseFile(fileName) {
+            var text = readFile ? readFile(fileName) : ts.sys.readFile(fileName);
+            if (!text) {
+                errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.File_0_not_found, fileName));
+                return;
+            }
+            var args = [];
+            var pos = 0;
+            while (true) {
+                while (pos < text.length && text.charCodeAt(pos) <= 32 /* space */)
+                    pos++;
+                if (pos >= text.length)
+                    break;
+                var start = pos;
+                if (text.charCodeAt(start) === 34 /* doubleQuote */) {
+                    pos++;
+                    while (pos < text.length && text.charCodeAt(pos) !== 34 /* doubleQuote */)
+                        pos++;
+                    if (pos < text.length) {
+                        args.push(text.substring(start + 1, pos));
+                        pos++;
+                    }
+                    else {
+                        errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Unterminated_quoted_string_in_response_file_0, fileName));
+                    }
+                }
+                else {
+                    while (text.charCodeAt(pos) > 32 /* space */)
+                        pos++;
+                    args.push(text.substring(start, pos));
+                }
+            }
+            parseStrings(args);
+        }
+    }
+    ts.parseCommandLine = parseCommandLine;
+    /** @internal */
+    function getOptionFromName(optionName, allowShort) {
+        if (allowShort === void 0) { allowShort = false; }
+        optionName = optionName.toLowerCase();
+        var _a = getOptionNameMap(), optionNameMap = _a.optionNameMap, shortOptionNames = _a.shortOptionNames;
+        // Try to translate short option names to their full equivalents.
+        if (allowShort) {
+            var short = shortOptionNames.get(optionName);
+            if (short !== undefined) {
+                optionName = short;
+            }
+        }
+        return optionNameMap.get(optionName);
+    }
+    ts.getOptionFromName = getOptionFromName;
+    function getDiagnosticText(_message) {
+        var _args = [];
+        for (var _i = 1; _i < arguments.length; _i++) {
+            _args[_i - 1] = arguments[_i];
+        }
+        var diagnostic = ts.createCompilerDiagnostic.apply(undefined, arguments);
+        return diagnostic.messageText;
+    }
+    /* @internal */
+    function printVersion() {
+        ts.sys.write(getDiagnosticText(ts.Diagnostics.Version_0, ts.version) + ts.sys.newLine);
+    }
+    ts.printVersion = printVersion;
+    /* @internal */
+    function printHelp(optionsList, syntaxPrefix) {
+        if (syntaxPrefix === void 0) { syntaxPrefix = ""; }
+        var output = [];
+        // We want to align our "syntax" and "examples" commands to a certain margin.
+        var syntaxLength = getDiagnosticText(ts.Diagnostics.Syntax_Colon_0, "").length;
+        var examplesLength = getDiagnosticText(ts.Diagnostics.Examples_Colon_0, "").length;
+        var marginLength = Math.max(syntaxLength, examplesLength);
+        // Build up the syntactic skeleton.
+        var syntax = makePadding(marginLength - syntaxLength);
+        syntax += "tsc " + syntaxPrefix + "[" + getDiagnosticText(ts.Diagnostics.options) + "] [" + getDiagnosticText(ts.Diagnostics.file) + "...]";
+        output.push(getDiagnosticText(ts.Diagnostics.Syntax_Colon_0, syntax));
+        output.push(ts.sys.newLine + ts.sys.newLine);
+        // Build up the list of examples.
+        var padding = makePadding(marginLength);
+        output.push(getDiagnosticText(ts.Diagnostics.Examples_Colon_0, makePadding(marginLength - examplesLength) + "tsc hello.ts") + ts.sys.newLine);
+        output.push(padding + "tsc --outFile file.js file.ts" + ts.sys.newLine);
+        output.push(padding + "tsc @args.txt" + ts.sys.newLine);
+        output.push(padding + "tsc --build tsconfig.json" + ts.sys.newLine);
+        output.push(ts.sys.newLine);
+        output.push(getDiagnosticText(ts.Diagnostics.Options_Colon) + ts.sys.newLine);
+        // We want our descriptions to align at the same column in our output,
+        // so we keep track of the longest option usage string.
+        marginLength = 0;
+        var usageColumn = []; // Things like "-d, --declaration" go in here.
+        var descriptionColumn = [];
+        var optionsDescriptionMap = ts.createMap(); // Map between option.description and list of option.type if it is a kind
+        for (var _i = 0, optionsList_1 = optionsList; _i < optionsList_1.length; _i++) {
+            var option = optionsList_1[_i];
+            // If an option lacks a description,
+            // it is not officially supported.
+            if (!option.description) {
+                continue;
+            }
+            var usageText_1 = " ";
+            if (option.shortName) {
+                usageText_1 += "-" + option.shortName;
+                usageText_1 += getParamType(option);
+                usageText_1 += ", ";
+            }
+            usageText_1 += "--" + option.name;
+            usageText_1 += getParamType(option);
+            usageColumn.push(usageText_1);
+            var description = void 0;
+            if (option.name === "lib") {
+                description = getDiagnosticText(option.description);
+                var element = option.element;
+                var typeMap = element.type;
+                optionsDescriptionMap.set(description, ts.arrayFrom(typeMap.keys()).map(function (key) { return "'" + key + "'"; }));
+            }
+            else {
+                description = getDiagnosticText(option.description);
+            }
+            descriptionColumn.push(description);
+            // Set the new margin for the description column if necessary.
+            marginLength = Math.max(usageText_1.length, marginLength);
+        }
+        // Special case that can't fit in the loop.
+        var usageText = " @<" + getDiagnosticText(ts.Diagnostics.file) + ">";
+        usageColumn.push(usageText);
+        descriptionColumn.push(getDiagnosticText(ts.Diagnostics.Insert_command_line_options_and_files_from_a_file));
+        marginLength = Math.max(usageText.length, marginLength);
+        // Print out each row, aligning all the descriptions on the same column.
+        for (var i = 0; i < usageColumn.length; i++) {
+            var usage = usageColumn[i];
+            var description = descriptionColumn[i];
+            var kindsList = optionsDescriptionMap.get(description);
+            output.push(usage + makePadding(marginLength - usage.length + 2) + description + ts.sys.newLine);
+            if (kindsList) {
+                output.push(makePadding(marginLength + 4));
+                for (var _a = 0, kindsList_1 = kindsList; _a < kindsList_1.length; _a++) {
+                    var kind = kindsList_1[_a];
+                    output.push(kind + " ");
+                }
+                output.push(ts.sys.newLine);
+            }
+        }
+        for (var _b = 0, output_1 = output; _b < output_1.length; _b++) {
+            var line = output_1[_b];
+            ts.sys.write(line);
+        }
+        return;
+        function getParamType(option) {
+            if (option.paramType !== undefined) {
+                return " " + getDiagnosticText(option.paramType);
+            }
+            return "";
+        }
+        function makePadding(paddingLength) {
+            return Array(paddingLength + 1).join(" ");
+        }
+    }
+    ts.printHelp = printHelp;
+    /**
+     * Reads the config file, reports errors if any and exits if the config file cannot be found
+     */
+    function getParsedCommandLineOfConfigFile(configFileName, optionsToExtend, host) {
+        var configFileText;
+        try {
+            configFileText = host.readFile(configFileName);
+        }
+        catch (e) {
+            var error = ts.createCompilerDiagnostic(ts.Diagnostics.Cannot_read_file_0_Colon_1, configFileName, e.message);
+            host.onUnRecoverableConfigFileDiagnostic(error);
+            return undefined;
+        }
+        if (!configFileText) {
+            var error = ts.createCompilerDiagnostic(ts.Diagnostics.File_0_not_found, configFileName);
+            host.onUnRecoverableConfigFileDiagnostic(error);
+            return undefined;
+        }
+        var result = ts.parseJsonText(configFileName, configFileText);
+        var cwd = host.getCurrentDirectory();
+        return parseJsonSourceFileConfigFileContent(result, host, ts.getNormalizedAbsolutePath(ts.getDirectoryPath(configFileName), cwd), optionsToExtend, ts.getNormalizedAbsolutePath(configFileName, cwd));
+    }
+    ts.getParsedCommandLineOfConfigFile = getParsedCommandLineOfConfigFile;
+    /**
+     * Read tsconfig.json file
+     * @param fileName The path to the config file
+     */
+    function readConfigFile(fileName, readFile) {
+        var textOrDiagnostic = tryReadFile(fileName, readFile);
+        return ts.isString(textOrDiagnostic) ? parseConfigFileTextToJson(fileName, textOrDiagnostic) : { config: {}, error: textOrDiagnostic };
+    }
+    ts.readConfigFile = readConfigFile;
+    /**
+     * Parse the text of the tsconfig.json file
+     * @param fileName The path to the config file
+     * @param jsonText The text of the config file
+     */
+    function parseConfigFileTextToJson(fileName, jsonText) {
+        var jsonSourceFile = ts.parseJsonText(fileName, jsonText);
+        return {
+            config: convertToObject(jsonSourceFile, jsonSourceFile.parseDiagnostics),
+            error: jsonSourceFile.parseDiagnostics.length ? jsonSourceFile.parseDiagnostics[0] : undefined
+        };
+    }
+    ts.parseConfigFileTextToJson = parseConfigFileTextToJson;
+    /**
+     * Read tsconfig.json file
+     * @param fileName The path to the config file
+     */
+    function readJsonConfigFile(fileName, readFile) {
+        var textOrDiagnostic = tryReadFile(fileName, readFile);
+        return ts.isString(textOrDiagnostic) ? ts.parseJsonText(fileName, textOrDiagnostic) : { parseDiagnostics: [textOrDiagnostic] };
+    }
+    ts.readJsonConfigFile = readJsonConfigFile;
+    function tryReadFile(fileName, readFile) {
+        var text;
+        try {
+            text = readFile(fileName);
+        }
+        catch (e) {
+            return ts.createCompilerDiagnostic(ts.Diagnostics.Cannot_read_file_0_Colon_1, fileName, e.message);
+        }
+        return text === undefined ? ts.createCompilerDiagnostic(ts.Diagnostics.The_specified_path_does_not_exist_Colon_0, fileName) : text;
+    }
+    function commandLineOptionsToMap(options) {
+        return ts.arrayToMap(options, function (option) { return option.name; });
+    }
+    var _tsconfigRootOptions;
+    function getTsconfigRootOptionsMap() {
+        if (_tsconfigRootOptions === undefined) {
+            _tsconfigRootOptions = {
+                name: undefined,
+                type: "object",
+                elementOptions: commandLineOptionsToMap([
+                    {
+                        name: "compilerOptions",
+                        type: "object",
+                        elementOptions: commandLineOptionsToMap(ts.optionDeclarations),
+                        extraKeyDiagnosticMessage: ts.Diagnostics.Unknown_compiler_option_0
+                    },
+                    {
+                        name: "typingOptions",
+                        type: "object",
+                        elementOptions: commandLineOptionsToMap(ts.typeAcquisitionDeclarations),
+                        extraKeyDiagnosticMessage: ts.Diagnostics.Unknown_type_acquisition_option_0
+                    },
+                    {
+                        name: "typeAcquisition",
+                        type: "object",
+                        elementOptions: commandLineOptionsToMap(ts.typeAcquisitionDeclarations),
+                        extraKeyDiagnosticMessage: ts.Diagnostics.Unknown_type_acquisition_option_0
+                    },
+                    {
+                        name: "extends",
+                        type: "string"
+                    },
+                    {
+                        name: "references",
+                        type: "list",
+                        element: {
+                            name: "references",
+                            type: "object"
+                        }
+                    },
+                    {
+                        name: "files",
+                        type: "list",
+                        element: {
+                            name: "files",
+                            type: "string"
+                        }
+                    },
+                    {
+                        name: "include",
+                        type: "list",
+                        element: {
+                            name: "include",
+                            type: "string"
+                        }
+                    },
+                    {
+                        name: "exclude",
+                        type: "list",
+                        element: {
+                            name: "exclude",
+                            type: "string"
+                        }
+                    },
+                    ts.compileOnSaveCommandLineOption
+                ])
+            };
+        }
+        return _tsconfigRootOptions;
+    }
+    /**
+     * Convert the json syntax tree into the json value
+     */
+    function convertToObject(sourceFile, errors) {
+        return convertToObjectWorker(sourceFile, errors, /*returnValue*/ true, /*knownRootOptions*/ undefined, /*jsonConversionNotifier*/ undefined);
+    }
+    ts.convertToObject = convertToObject;
+    /**
+     * Convert the json syntax tree into the json value and report errors
+     * This returns the json value (apart from checking errors) only if returnValue provided is true.
+     * Otherwise it just checks the errors and returns undefined
+     */
+    /*@internal*/
+    function convertToObjectWorker(sourceFile, errors, returnValue, knownRootOptions, jsonConversionNotifier) {
+        if (!sourceFile.statements.length) {
+            return returnValue ? {} : undefined;
+        }
+        return convertPropertyValueToJson(sourceFile.statements[0].expression, knownRootOptions);
+        function isRootOptionMap(knownOptions) {
+            return knownRootOptions && knownRootOptions.elementOptions === knownOptions;
+        }
+        function convertObjectLiteralExpressionToJson(node, knownOptions, extraKeyDiagnosticMessage, parentOption) {
+            var result = returnValue ? {} : undefined;
+            for (var _i = 0, _a = node.properties; _i < _a.length; _i++) {
+                var element = _a[_i];
+                if (element.kind !== 270 /* PropertyAssignment */) {
+                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, element, ts.Diagnostics.Property_assignment_expected));
+                    continue;
+                }
+                if (element.questionToken) {
+                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, element.questionToken, ts.Diagnostics._0_can_only_be_used_in_a_ts_file, "?"));
+                }
+                if (!isDoubleQuotedString(element.name)) {
+                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, element.name, ts.Diagnostics.String_literal_with_double_quotes_expected));
+                }
+                var keyText = ts.unescapeLeadingUnderscores(ts.getTextOfPropertyName(element.name));
+                var option = knownOptions ? knownOptions.get(keyText) : undefined;
+                if (extraKeyDiagnosticMessage && !option) {
+                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, element.name, extraKeyDiagnosticMessage, keyText));
+                }
+                var value = convertPropertyValueToJson(element.initializer, option);
+                if (typeof keyText !== "undefined") {
+                    if (returnValue) {
+                        result[keyText] = value;
+                    }
+                    // Notify key value set, if user asked for it
+                    if (jsonConversionNotifier &&
+                        // Current callbacks are only on known parent option or if we are setting values in the root
+                        (parentOption || isRootOptionMap(knownOptions))) {
+                        var isValidOptionValue = isCompilerOptionsValue(option, value);
+                        if (parentOption) {
+                            if (isValidOptionValue) {
+                                // Notify option set in the parent if its a valid option value
+                                jsonConversionNotifier.onSetValidOptionKeyValueInParent(parentOption, option, value);
+                            }
+                        }
+                        else if (isRootOptionMap(knownOptions)) {
+                            if (isValidOptionValue) {
+                                // Notify about the valid root key value being set
+                                jsonConversionNotifier.onSetValidOptionKeyValueInRoot(keyText, element.name, value, element.initializer);
+                            }
+                            else if (!option) {
+                                // Notify about the unknown root key value being set
+                                jsonConversionNotifier.onSetUnknownOptionKeyValueInRoot(keyText, element.name, value, element.initializer);
+                            }
+                        }
+                    }
+                }
+            }
+            return result;
+        }
+        function convertArrayLiteralExpressionToJson(elements, elementOption) {
+            return (returnValue ? elements.map : elements.forEach).call(elements, function (element) { return convertPropertyValueToJson(element, elementOption); });
+        }
+        function convertPropertyValueToJson(valueExpression, option) {
+            switch (valueExpression.kind) {
+                case 101 /* TrueKeyword */:
+                    reportInvalidOptionValue(option && option.type !== "boolean");
+                    return true;
+                case 86 /* FalseKeyword */:
+                    reportInvalidOptionValue(option && option.type !== "boolean");
+                    return false;
+                case 95 /* NullKeyword */:
+                    reportInvalidOptionValue(option && option.name === "extends"); // "extends" is the only option we don't allow null/undefined for
+                    return null; // tslint:disable-line:no-null-keyword
+                case 9 /* StringLiteral */:
+                    if (!isDoubleQuotedString(valueExpression)) {
+                        errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, valueExpression, ts.Diagnostics.String_literal_with_double_quotes_expected));
+                    }
+                    reportInvalidOptionValue(option && (ts.isString(option.type) && option.type !== "string"));
+                    var text = valueExpression.text;
+                    if (option && !ts.isString(option.type)) {
+                        var customOption = option;
+                        // Validate custom option type
+                        if (!customOption.type.has(text.toLowerCase())) {
+                            errors.push(createDiagnosticForInvalidCustomType(customOption, function (message, arg0, arg1) { return ts.createDiagnosticForNodeInSourceFile(sourceFile, valueExpression, message, arg0, arg1); }));
+                        }
+                    }
+                    return text;
+                case 8 /* NumericLiteral */:
+                    reportInvalidOptionValue(option && option.type !== "number");
+                    return Number(valueExpression.text);
+                case 198 /* PrefixUnaryExpression */:
+                    if (valueExpression.operator !== 38 /* MinusToken */ || valueExpression.operand.kind !== 8 /* NumericLiteral */) {
+                        break; // not valid JSON syntax
+                    }
+                    reportInvalidOptionValue(option && option.type !== "number");
+                    return -Number(valueExpression.operand.text);
+                case 184 /* ObjectLiteralExpression */:
+                    reportInvalidOptionValue(option && option.type !== "object");
+                    var objectLiteralExpression = valueExpression;
+                    // Currently having element option declaration in the tsconfig with type "object"
+                    // determines if it needs onSetValidOptionKeyValueInParent callback or not
+                    // At moment there are only "compilerOptions", "typeAcquisition" and "typingOptions"
+                    // that satifies it and need it to modify options set in them (for normalizing file paths)
+                    // vs what we set in the json
+                    // If need arises, we can modify this interface and callbacks as needed
+                    if (option) {
+                        var _a = option, elementOptions = _a.elementOptions, extraKeyDiagnosticMessage = _a.extraKeyDiagnosticMessage, optionName = _a.name;
+                        return convertObjectLiteralExpressionToJson(objectLiteralExpression, elementOptions, extraKeyDiagnosticMessage, optionName);
+                    }
+                    else {
+                        return convertObjectLiteralExpressionToJson(objectLiteralExpression, /* knownOptions*/ undefined, 
+                        /*extraKeyDiagnosticMessage */ undefined, /*parentOption*/ undefined);
+                    }
+                case 183 /* ArrayLiteralExpression */:
+                    reportInvalidOptionValue(option && option.type !== "list");
+                    return convertArrayLiteralExpressionToJson(valueExpression.elements, option && option.element);
+            }
+            // Not in expected format
+            if (option) {
+                reportInvalidOptionValue(/*isError*/ true);
+            }
+            else {
+                errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, valueExpression, ts.Diagnostics.Property_value_can_only_be_string_literal_numeric_literal_true_false_null_object_literal_or_array_literal));
+            }
+            return undefined;
+            function reportInvalidOptionValue(isError) {
+                if (isError) {
+                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, valueExpression, ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, option.name, getCompilerOptionValueTypeString(option)));
+                }
+            }
+        }
+        function isDoubleQuotedString(node) {
+            return ts.isStringLiteral(node) && ts.isStringDoubleQuoted(node, sourceFile);
+        }
+    }
+    ts.convertToObjectWorker = convertToObjectWorker;
+    function getCompilerOptionValueTypeString(option) {
+        return option.type === "list" ?
+            "Array" :
+            ts.isString(option.type) ? option.type : "string";
+    }
+    function isCompilerOptionsValue(option, value) {
+        if (option) {
+            if (isNullOrUndefined(value))
+                return true; // All options are undefinable/nullable
+            if (option.type === "list") {
+                return ts.isArray(value);
+            }
+            var expectedType = ts.isString(option.type) ? option.type : "string";
+            return typeof value === expectedType;
+        }
+        return false;
+    }
+    /**
+     * Generate tsconfig configuration when running command line "--init"
+     * @param options commandlineOptions to be generated into tsconfig.json
+     * @param fileNames array of filenames to be generated into tsconfig.json
+     */
+    /* @internal */
+    function generateTSConfig(options, fileNames, newLine) {
+        var compilerOptions = ts.extend(options, ts.defaultInitCompilerOptions);
+        var compilerOptionsMap = serializeCompilerOptions(compilerOptions);
+        return writeConfigurations();
+        function getCustomTypeMapOfCommandLineOption(optionDefinition) {
+            if (optionDefinition.type === "string" || optionDefinition.type === "number" || optionDefinition.type === "boolean") {
+                // this is of a type CommandLineOptionOfPrimitiveType
+                return undefined;
+            }
+            else if (optionDefinition.type === "list") {
+                return getCustomTypeMapOfCommandLineOption(optionDefinition.element);
+            }
+            else {
+                return optionDefinition.type;
+            }
+        }
+        function getNameOfCompilerOptionValue(value, customTypeMap) {
+            // There is a typeMap associated with this command-line option so use it to map value back to its name
+            return ts.forEachEntry(customTypeMap, function (mapValue, key) {
+                if (mapValue === value) {
+                    return key;
+                }
+            });
+        }
+        function serializeCompilerOptions(options) {
+            var result = ts.createMap();
+            var optionsNameMap = getOptionNameMap().optionNameMap;
+            var _loop_3 = function (name) {
+                if (ts.hasProperty(options, name)) {
+                    // tsconfig only options cannot be specified via command line,
+                    // so we can assume that only types that can appear here string | number | boolean
+                    if (optionsNameMap.has(name) && optionsNameMap.get(name).category === ts.Diagnostics.Command_line_Options) {
+                        return "continue";
+                    }
+                    var value = options[name];
+                    var optionDefinition = optionsNameMap.get(name.toLowerCase());
+                    if (optionDefinition) {
+                        var customTypeMap_1 = getCustomTypeMapOfCommandLineOption(optionDefinition);
+                        if (!customTypeMap_1) {
+                            // There is no map associated with this compiler option then use the value as-is
+                            // This is the case if the value is expect to be string, number, boolean or list of string
+                            result.set(name, value);
+                        }
+                        else {
+                            if (optionDefinition.type === "list") {
+                                result.set(name, value.map(function (element) { return getNameOfCompilerOptionValue(element, customTypeMap_1); })); // TODO: GH#18217
+                            }
+                            else {
+                                // There is a typeMap associated with this command-line option so use it to map value back to its name
+                                result.set(name, getNameOfCompilerOptionValue(value, customTypeMap_1));
+                            }
+                        }
+                    }
+                }
+            };
+            for (var name in options) {
+                _loop_3(name);
+            }
+            return result;
+        }
+        function getDefaultValueForOption(option) {
+            switch (option.type) {
+                case "number":
+                    return 1;
+                case "boolean":
+                    return true;
+                case "string":
+                    return option.isFilePath ? "./" : "";
+                case "list":
+                    return [];
+                case "object":
+                    return {};
+                default:
+                    return option.type.keys().next().value;
+            }
+        }
+        function makePadding(paddingLength) {
+            return Array(paddingLength + 1).join(" ");
+        }
+        function isAllowedOption(_a) {
+            var category = _a.category, name = _a.name;
+            // Skip options which do not have a category or have category `Command_line_Options`
+            // Exclude all possible `Advanced_Options` in tsconfig.json which were NOT defined in command line
+            return category !== undefined
+                && category !== ts.Diagnostics.Command_line_Options
+                && (category !== ts.Diagnostics.Advanced_Options || compilerOptionsMap.has(name));
+        }
+        function writeConfigurations() {
+            // Filter applicable options to place in the file
+            var categorizedOptions = ts.createMultiMap();
+            for (var _i = 0, optionDeclarations_1 = ts.optionDeclarations; _i < optionDeclarations_1.length; _i++) {
+                var option = optionDeclarations_1[_i];
+                var category = option.category;
+                if (isAllowedOption(option)) {
+                    categorizedOptions.add(ts.getLocaleSpecificMessage(category), option);
+                }
+            }
+            // Serialize all options and their descriptions
+            var marginLength = 0;
+            var seenKnownKeys = 0;
+            var nameColumn = [];
+            var descriptionColumn = [];
+            categorizedOptions.forEach(function (options, category) {
+                if (nameColumn.length !== 0) {
+                    nameColumn.push("");
+                    descriptionColumn.push("");
+                }
+                nameColumn.push("/* " + category + " */");
+                descriptionColumn.push("");
+                for (var _i = 0, options_1 = options; _i < options_1.length; _i++) {
+                    var option = options_1[_i];
+                    var optionName = void 0;
+                    if (compilerOptionsMap.has(option.name)) {
+                        optionName = "\"" + option.name + "\": " + JSON.stringify(compilerOptionsMap.get(option.name)) + ((seenKnownKeys += 1) === compilerOptionsMap.size ? "" : ",");
+                    }
+                    else {
+                        optionName = "// \"" + option.name + "\": " + JSON.stringify(getDefaultValueForOption(option)) + ",";
+                    }
+                    nameColumn.push(optionName);
+                    descriptionColumn.push("/* " + (option.description && ts.getLocaleSpecificMessage(option.description) || option.name) + " */");
+                    marginLength = Math.max(optionName.length, marginLength);
+                }
+            });
+            // Write the output
+            var tab = makePadding(2);
+            var result = [];
+            result.push("{");
+            result.push(tab + "\"compilerOptions\": {");
+            // Print out each row, aligning all the descriptions on the same column.
+            for (var i = 0; i < nameColumn.length; i++) {
+                var optionName = nameColumn[i];
+                var description = descriptionColumn[i];
+                result.push(optionName && "" + tab + tab + optionName + (description && (makePadding(marginLength - optionName.length + 2) + description)));
+            }
+            if (fileNames.length) {
+                result.push(tab + "},");
+                result.push(tab + "\"files\": [");
+                for (var i = 0; i < fileNames.length; i++) {
+                    result.push("" + tab + tab + JSON.stringify(fileNames[i]) + (i === fileNames.length - 1 ? "" : ","));
+                }
+                result.push(tab + "]");
+            }
+            else {
+                result.push(tab + "}");
+            }
+            result.push("}");
+            return result.join(newLine);
+        }
+    }
+    ts.generateTSConfig = generateTSConfig;
+    /**
+     * Parse the contents of a config file (tsconfig.json).
+     * @param json The contents of the config file to parse
+     * @param host Instance of ParseConfigHost used to enumerate files in folder.
+     * @param basePath A root directory to resolve relative path entries in the config
+     *    file to. e.g. outDir
+     */
+    function parseJsonConfigFileContent(json, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions) {
+        return parseJsonConfigFileContentWorker(json, /*sourceFile*/ undefined, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions);
+    }
+    ts.parseJsonConfigFileContent = parseJsonConfigFileContent;
+    /**
+     * Parse the contents of a config file (tsconfig.json).
+     * @param jsonNode The contents of the config file to parse
+     * @param host Instance of ParseConfigHost used to enumerate files in folder.
+     * @param basePath A root directory to resolve relative path entries in the config
+     *    file to. e.g. outDir
+     */
+    function parseJsonSourceFileConfigFileContent(sourceFile, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions) {
+        return parseJsonConfigFileContentWorker(/*json*/ undefined, sourceFile, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions);
+    }
+    ts.parseJsonSourceFileConfigFileContent = parseJsonSourceFileConfigFileContent;
+    /*@internal*/
+    function setConfigFileInOptions(options, configFile) {
+        if (configFile) {
+            Object.defineProperty(options, "configFile", { enumerable: false, writable: false, value: configFile });
+        }
+    }
+    ts.setConfigFileInOptions = setConfigFileInOptions;
+    function isNullOrUndefined(x) {
+        // tslint:disable-next-line:no-null-keyword
+        return x === undefined || x === null;
+    }
+    function directoryOfCombinedPath(fileName, basePath) {
+        // Use the `getNormalizedAbsolutePath` function to avoid canonicalizing the path, as it must remain noncanonical
+        // until consistient casing errors are reported
+        return ts.getDirectoryPath(ts.getNormalizedAbsolutePath(fileName, basePath));
+    }
+    /**
+     * Parse the contents of a config file from json or json source file (tsconfig.json).
+     * @param json The contents of the config file to parse
+     * @param sourceFile sourceFile corresponding to the Json
+     * @param host Instance of ParseConfigHost used to enumerate files in folder.
+     * @param basePath A root directory to resolve relative path entries in the config
+     *    file to. e.g. outDir
+     * @param resolutionStack Only present for backwards-compatibility. Should be empty.
+     */
+    function parseJsonConfigFileContentWorker(json, sourceFile, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions) {
+        if (existingOptions === void 0) { existingOptions = {}; }
+        if (resolutionStack === void 0) { resolutionStack = []; }
+        if (extraFileExtensions === void 0) { extraFileExtensions = []; }
+        ts.Debug.assert((json === undefined && sourceFile !== undefined) || (json !== undefined && sourceFile === undefined));
+        var errors = [];
+        var parsedConfig = parseConfig(json, sourceFile, host, basePath, configFileName, resolutionStack, errors);
+        var raw = parsedConfig.raw;
+        var options = ts.extend(existingOptions, parsedConfig.options || {});
+        options.configFilePath = configFileName && ts.normalizeSlashes(configFileName);
+        setConfigFileInOptions(options, sourceFile);
+        var _a = getFileNames(), fileNames = _a.fileNames, wildcardDirectories = _a.wildcardDirectories, spec = _a.spec, projectReferences = _a.projectReferences;
+        return {
+            options: options,
+            fileNames: fileNames,
+            projectReferences: projectReferences,
+            typeAcquisition: parsedConfig.typeAcquisition || getDefaultTypeAcquisition(),
+            raw: raw,
+            errors: errors,
+            wildcardDirectories: wildcardDirectories,
+            compileOnSave: !!raw.compileOnSave,
+            configFileSpecs: spec
+        };
+        function getFileNames() {
+            var filesSpecs;
+            if (ts.hasProperty(raw, "files") && !isNullOrUndefined(raw.files)) {
+                if (ts.isArray(raw.files)) {
+                    filesSpecs = raw.files;
+                    if (filesSpecs.length === 0) {
+                        createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.The_files_list_in_config_file_0_is_empty, configFileName || "tsconfig.json");
+                    }
+                }
+                else {
+                    createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "files", "Array");
+                }
+            }
+            var includeSpecs;
+            if (ts.hasProperty(raw, "include") && !isNullOrUndefined(raw.include)) {
+                if (ts.isArray(raw.include)) {
+                    includeSpecs = raw.include;
+                }
+                else {
+                    createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "include", "Array");
+                }
+            }
+            var excludeSpecs;
+            if (ts.hasProperty(raw, "exclude") && !isNullOrUndefined(raw.exclude)) {
+                if (ts.isArray(raw.exclude)) {
+                    excludeSpecs = raw.exclude;
+                }
+                else {
+                    createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "exclude", "Array");
+                }
+            }
+            else if (raw.compilerOptions) {
+                var outDir = raw.compilerOptions.outDir;
+                var declarationDir = raw.compilerOptions.declarationDir;
+                if (outDir || declarationDir) {
+                    excludeSpecs = [outDir, declarationDir].filter(function (d) { return !!d; });
+                }
+            }
+            if (filesSpecs === undefined && includeSpecs === undefined) {
+                includeSpecs = ["**/*"];
+            }
+            var result = matchFileNames(filesSpecs, includeSpecs, excludeSpecs, configFileName ? directoryOfCombinedPath(configFileName, basePath) : basePath, options, host, errors, extraFileExtensions, sourceFile);
+            if (result.fileNames.length === 0 && !ts.hasProperty(raw, "files") && resolutionStack.length === 0 && !ts.hasProperty(raw, "references")) {
+                errors.push(getErrorForNoInputFiles(result.spec, configFileName));
+            }
+            if (ts.hasProperty(raw, "references") && !isNullOrUndefined(raw.references)) {
+                if (ts.isArray(raw.references)) {
+                    var references = [];
+                    for (var _i = 0, _a = raw.references; _i < _a.length; _i++) {
+                        var ref = _a[_i];
+                        if (typeof ref.path !== "string") {
+                            createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "reference.path", "string");
+                        }
+                        else {
+                            references.push({
+                                path: ts.getNormalizedAbsolutePath(ref.path, basePath),
+                                originalPath: ref.path,
+                                prepend: ref.prepend,
+                                circular: ref.circular
+                            });
+                        }
+                    }
+                    result.projectReferences = references;
+                }
+                else {
+                    createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "references", "Array");
+                }
+            }
+            return result;
+        }
+        function createCompilerDiagnosticOnlyIfJson(message, arg0, arg1) {
+            if (!sourceFile) {
+                errors.push(ts.createCompilerDiagnostic(message, arg0, arg1));
+            }
+        }
+    }
+    /*@internal*/
+    function isErrorNoInputFiles(error) {
+        return error.code === ts.Diagnostics.No_inputs_were_found_in_config_file_0_Specified_include_paths_were_1_and_exclude_paths_were_2.code;
+    }
+    ts.isErrorNoInputFiles = isErrorNoInputFiles;
+    /*@internal*/
+    function getErrorForNoInputFiles(_a, configFileName) {
+        var includeSpecs = _a.includeSpecs, excludeSpecs = _a.excludeSpecs;
+        return ts.createCompilerDiagnostic(ts.Diagnostics.No_inputs_were_found_in_config_file_0_Specified_include_paths_were_1_and_exclude_paths_were_2, configFileName || "tsconfig.json", JSON.stringify(includeSpecs || []), JSON.stringify(excludeSpecs || []));
+    }
+    ts.getErrorForNoInputFiles = getErrorForNoInputFiles;
+    function isSuccessfulParsedTsconfig(value) {
+        return !!value.options;
+    }
+    /**
+     * This *just* extracts options/include/exclude/files out of a config file.
+     * It does *not* resolve the included files.
+     */
+    function parseConfig(json, sourceFile, host, basePath, configFileName, resolutionStack, errors) {
+        basePath = ts.normalizeSlashes(basePath);
+        var resolvedPath = ts.getNormalizedAbsolutePath(configFileName || "", basePath);
+        if (resolutionStack.indexOf(resolvedPath) >= 0) {
+            errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Circularity_detected_while_resolving_configuration_Colon_0, resolutionStack.concat([resolvedPath]).join(" -> ")));
+            return { raw: json || convertToObject(sourceFile, errors) };
+        }
+        var ownConfig = json ?
+            parseOwnConfigOfJson(json, host, basePath, configFileName, errors) :
+            parseOwnConfigOfJsonSourceFile(sourceFile, host, basePath, configFileName, errors);
+        if (ownConfig.extendedConfigPath) {
+            // copy the resolution stack so it is never reused between branches in potential diamond-problem scenarios.
+            resolutionStack = resolutionStack.concat([resolvedPath]);
+            var extendedConfig = getExtendedConfig(sourceFile, ownConfig.extendedConfigPath, host, basePath, resolutionStack, errors);
+            if (extendedConfig && isSuccessfulParsedTsconfig(extendedConfig)) {
+                var baseRaw_1 = extendedConfig.raw;
+                var raw_1 = ownConfig.raw;
+                var setPropertyInRawIfNotUndefined = function (propertyName) {
+                    var value = raw_1[propertyName] || baseRaw_1[propertyName];
+                    if (value) {
+                        raw_1[propertyName] = value;
+                    }
+                };
+                setPropertyInRawIfNotUndefined("include");
+                setPropertyInRawIfNotUndefined("exclude");
+                setPropertyInRawIfNotUndefined("files");
+                if (raw_1.compileOnSave === undefined) {
+                    raw_1.compileOnSave = baseRaw_1.compileOnSave;
+                }
+                ownConfig.options = ts.assign({}, extendedConfig.options, ownConfig.options);
+                // TODO extend type typeAcquisition
+            }
+        }
+        return ownConfig;
+    }
+    function parseOwnConfigOfJson(json, host, basePath, configFileName, errors) {
+        if (ts.hasProperty(json, "excludes")) {
+            errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Unknown_option_excludes_Did_you_mean_exclude));
+        }
+        var options = convertCompilerOptionsFromJsonWorker(json.compilerOptions, basePath, errors, configFileName);
+        // typingOptions has been deprecated and is only supported for backward compatibility purposes.
+        // It should be removed in future releases - use typeAcquisition instead.
+        var typeAcquisition = convertTypeAcquisitionFromJsonWorker(json.typeAcquisition || json.typingOptions, basePath, errors, configFileName);
+        json.compileOnSave = convertCompileOnSaveOptionFromJson(json, basePath, errors);
+        var extendedConfigPath;
+        if (json.extends) {
+            if (!ts.isString(json.extends)) {
+                errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "extends", "string"));
+            }
+            else {
+                var newBase = configFileName ? directoryOfCombinedPath(configFileName, basePath) : basePath;
+                extendedConfigPath = getExtendsConfigPath(json.extends, host, newBase, errors, ts.createCompilerDiagnostic);
+            }
+        }
+        return { raw: json, options: options, typeAcquisition: typeAcquisition, extendedConfigPath: extendedConfigPath };
+    }
+    function parseOwnConfigOfJsonSourceFile(sourceFile, host, basePath, configFileName, errors) {
+        var options = getDefaultCompilerOptions(configFileName);
+        var typeAcquisition, typingOptionstypeAcquisition;
+        var extendedConfigPath;
+        var optionsIterator = {
+            onSetValidOptionKeyValueInParent: function (parentOption, option, value) {
+                ts.Debug.assert(parentOption === "compilerOptions" || parentOption === "typeAcquisition" || parentOption === "typingOptions");
+                var currentOption = parentOption === "compilerOptions" ?
+                    options :
+                    parentOption === "typeAcquisition" ?
+                        (typeAcquisition || (typeAcquisition = getDefaultTypeAcquisition(configFileName))) :
+                        (typingOptionstypeAcquisition || (typingOptionstypeAcquisition = getDefaultTypeAcquisition(configFileName)));
+                currentOption[option.name] = normalizeOptionValue(option, basePath, value);
+            },
+            onSetValidOptionKeyValueInRoot: function (key, _keyNode, value, valueNode) {
+                switch (key) {
+                    case "extends":
+                        var newBase = configFileName ? directoryOfCombinedPath(configFileName, basePath) : basePath;
+                        extendedConfigPath = getExtendsConfigPath(value, host, newBase, errors, function (message, arg0) {
+                            return ts.createDiagnosticForNodeInSourceFile(sourceFile, valueNode, message, arg0);
+                        });
+                        return;
+                    case "files":
+                        if (value.length === 0) {
+                            errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, valueNode, ts.Diagnostics.The_files_list_in_config_file_0_is_empty, configFileName || "tsconfig.json"));
+                        }
+                        return;
+                }
+            },
+            onSetUnknownOptionKeyValueInRoot: function (key, keyNode, _value, _valueNode) {
+                if (key === "excludes") {
+                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, keyNode, ts.Diagnostics.Unknown_option_excludes_Did_you_mean_exclude));
+                }
+            }
+        };
+        var json = convertToObjectWorker(sourceFile, errors, /*returnValue*/ true, getTsconfigRootOptionsMap(), optionsIterator);
+        if (!typeAcquisition) {
+            if (typingOptionstypeAcquisition) {
+                typeAcquisition = (typingOptionstypeAcquisition.enableAutoDiscovery !== undefined) ?
+                    {
+                        enable: typingOptionstypeAcquisition.enableAutoDiscovery,
+                        include: typingOptionstypeAcquisition.include,
+                        exclude: typingOptionstypeAcquisition.exclude
+                    } :
+                    typingOptionstypeAcquisition;
+            }
+            else {
+                typeAcquisition = getDefaultTypeAcquisition(configFileName);
+            }
+        }
+        return { raw: json, options: options, typeAcquisition: typeAcquisition, extendedConfigPath: extendedConfigPath };
+    }
+    function getExtendsConfigPath(extendedConfig, host, basePath, errors, createDiagnostic) {
+        extendedConfig = ts.normalizeSlashes(extendedConfig);
+        // If the path isn't a rooted or relative path, don't try to resolve it (we reserve the right to special case module-id like paths in the future)
+        if (!(ts.isRootedDiskPath(extendedConfig) || ts.startsWith(extendedConfig, "./") || ts.startsWith(extendedConfig, "../"))) {
+            errors.push(createDiagnostic(ts.Diagnostics.A_path_in_an_extends_option_must_be_relative_or_rooted_but_0_is_not, extendedConfig));
+            return undefined;
+        }
+        var extendedConfigPath = ts.getNormalizedAbsolutePath(extendedConfig, basePath);
+        if (!host.fileExists(extendedConfigPath) && !ts.endsWith(extendedConfigPath, ".json" /* Json */)) {
+            extendedConfigPath = extendedConfigPath + ".json";
+            if (!host.fileExists(extendedConfigPath)) {
+                errors.push(createDiagnostic(ts.Diagnostics.File_0_does_not_exist, extendedConfig));
+                return undefined;
+            }
+        }
+        return extendedConfigPath;
+    }
+    function getExtendedConfig(sourceFile, extendedConfigPath, host, basePath, resolutionStack, errors) {
+        var _a;
+        var extendedResult = readJsonConfigFile(extendedConfigPath, function (path) { return host.readFile(path); });
+        if (sourceFile) {
+            (sourceFile.extendedSourceFiles || (sourceFile.extendedSourceFiles = [])).push(extendedResult.fileName);
+        }
+        if (extendedResult.parseDiagnostics.length) {
+            errors.push.apply(errors, extendedResult.parseDiagnostics);
+            return undefined;
+        }
+        var extendedDirname = ts.getDirectoryPath(extendedConfigPath);
+        var extendedConfig = parseConfig(/*json*/ undefined, extendedResult, host, extendedDirname, ts.getBaseFileName(extendedConfigPath), resolutionStack, errors);
+        if (sourceFile) {
+            (_a = sourceFile.extendedSourceFiles).push.apply(_a, extendedResult.extendedSourceFiles);
+        }
+        if (isSuccessfulParsedTsconfig(extendedConfig)) {
+            // Update the paths to reflect base path
+            var relativeDifference_1 = ts.convertToRelativePath(extendedDirname, basePath, ts.identity);
+            var updatePath_1 = function (path) { return ts.isRootedDiskPath(path) ? path : ts.combinePaths(relativeDifference_1, path); };
+            var mapPropertiesInRawIfNotUndefined = function (propertyName) {
+                if (raw_2[propertyName]) {
+                    raw_2[propertyName] = ts.map(raw_2[propertyName], updatePath_1);
+                }
+            };
+            var raw_2 = extendedConfig.raw;
+            mapPropertiesInRawIfNotUndefined("include");
+            mapPropertiesInRawIfNotUndefined("exclude");
+            mapPropertiesInRawIfNotUndefined("files");
+        }
+        return extendedConfig;
+    }
+    function convertCompileOnSaveOptionFromJson(jsonOption, basePath, errors) {
+        if (!ts.hasProperty(jsonOption, ts.compileOnSaveCommandLineOption.name)) {
+            return false;
+        }
+        var result = convertJsonOption(ts.compileOnSaveCommandLineOption, jsonOption.compileOnSave, basePath, errors);
+        return typeof result === "boolean" && result;
+    }
+    function convertCompilerOptionsFromJson(jsonOptions, basePath, configFileName) {
+        var errors = [];
+        var options = convertCompilerOptionsFromJsonWorker(jsonOptions, basePath, errors, configFileName);
+        return { options: options, errors: errors };
+    }
+    ts.convertCompilerOptionsFromJson = convertCompilerOptionsFromJson;
+    function convertTypeAcquisitionFromJson(jsonOptions, basePath, configFileName) {
+        var errors = [];
+        var options = convertTypeAcquisitionFromJsonWorker(jsonOptions, basePath, errors, configFileName);
+        return { options: options, errors: errors };
+    }
+    ts.convertTypeAcquisitionFromJson = convertTypeAcquisitionFromJson;
+    function getDefaultCompilerOptions(configFileName) {
+        var options = configFileName && ts.getBaseFileName(configFileName) === "jsconfig.json"
+            ? { allowJs: true, maxNodeModuleJsDepth: 2, allowSyntheticDefaultImports: true, skipLibCheck: true, noEmit: true }
+            : {};
+        return options;
+    }
+    function convertCompilerOptionsFromJsonWorker(jsonOptions, basePath, errors, configFileName) {
+        var options = getDefaultCompilerOptions(configFileName);
+        convertOptionsFromJson(ts.optionDeclarations, jsonOptions, basePath, options, ts.Diagnostics.Unknown_compiler_option_0, errors);
+        if (configFileName) {
+            options.configFilePath = ts.normalizeSlashes(configFileName);
+        }
+        return options;
+    }
+    function getDefaultTypeAcquisition(configFileName) {
+        return { enable: !!configFileName && ts.getBaseFileName(configFileName) === "jsconfig.json", include: [], exclude: [] };
+    }
+    function convertTypeAcquisitionFromJsonWorker(jsonOptions, basePath, errors, configFileName) {
+        var options = getDefaultTypeAcquisition(configFileName);
+        var typeAcquisition = convertEnableAutoDiscoveryToEnable(jsonOptions);
+        convertOptionsFromJson(ts.typeAcquisitionDeclarations, typeAcquisition, basePath, options, ts.Diagnostics.Unknown_type_acquisition_option_0, errors);
+        return options;
+    }
+    function convertOptionsFromJson(optionDeclarations, jsonOptions, basePath, defaultOptions, diagnosticMessage, errors) {
+        if (!jsonOptions) {
+            return;
+        }
+        var optionNameMap = commandLineOptionsToMap(optionDeclarations);
+        for (var id in jsonOptions) {
+            var opt = optionNameMap.get(id);
+            if (opt) {
+                defaultOptions[opt.name] = convertJsonOption(opt, jsonOptions[id], basePath, errors);
+            }
+            else {
+                errors.push(ts.createCompilerDiagnostic(diagnosticMessage, id));
+            }
+        }
+    }
+    function convertJsonOption(opt, value, basePath, errors) {
+        if (isCompilerOptionsValue(opt, value)) {
+            var optType = opt.type;
+            if (optType === "list" && ts.isArray(value)) {
+                return convertJsonOptionOfListType(opt, value, basePath, errors);
+            }
+            else if (!ts.isString(optType)) {
+                return convertJsonOptionOfCustomType(opt, value, errors);
+            }
+            return normalizeNonListOptionValue(opt, basePath, value);
+        }
+        else {
+            errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, opt.name, getCompilerOptionValueTypeString(opt)));
+        }
+    }
+    function normalizeOptionValue(option, basePath, value) {
+        if (isNullOrUndefined(value))
+            return undefined;
+        if (option.type === "list") {
+            var listOption_1 = option;
+            if (listOption_1.element.isFilePath || !ts.isString(listOption_1.element.type)) {
+                return ts.filter(ts.map(value, function (v) { return normalizeOptionValue(listOption_1.element, basePath, v); }), function (v) { return !!v; });
+            }
+            return value;
+        }
+        else if (!ts.isString(option.type)) {
+            return option.type.get(ts.isString(value) ? value.toLowerCase() : value);
+        }
+        return normalizeNonListOptionValue(option, basePath, value);
+    }
+    function normalizeNonListOptionValue(option, basePath, value) {
+        if (option.isFilePath) {
+            value = ts.normalizePath(ts.combinePaths(basePath, value));
+            if (value === "") {
+                value = ".";
+            }
+        }
+        return value;
+    }
+    function convertJsonOptionOfCustomType(opt, value, errors) {
+        if (isNullOrUndefined(value))
+            return undefined;
+        var key = value.toLowerCase();
+        var val = opt.type.get(key);
+        if (val !== undefined) {
+            return val;
+        }
+        else {
+            errors.push(createCompilerDiagnosticForInvalidCustomType(opt));
+        }
+    }
+    function convertJsonOptionOfListType(option, values, basePath, errors) {
+        return ts.filter(ts.map(values, function (v) { return convertJsonOption(option.element, v, basePath, errors); }), function (v) { return !!v; });
+    }
+    function trimString(s) {
+        return typeof s.trim === "function" ? s.trim() : s.replace(/^[\s]+|[\s]+$/g, "");
+    }
+    /**
+     * Tests for a path that ends in a recursive directory wildcard.
+     * Matches **, \**, **\, and \**\, but not a**b.
+     *
+     * NOTE: used \ in place of / above to avoid issues with multiline comments.
+     *
+     * Breakdown:
+     *  (^|\/)      # matches either the beginning of the string or a directory separator.
+     *  \*\*        # matches the recursive directory wildcard "**".
+     *  \/?$        # matches an optional trailing directory separator at the end of the string.
+     */
+    var invalidTrailingRecursionPattern = /(^|\/)\*\*\/?$/;
+    /**
+     * Tests for a path where .. appears after a recursive directory wildcard.
+     * Matches **\..\*, **\a\..\*, and **\.., but not ..\**\*
+     *
+     * NOTE: used \ in place of / above to avoid issues with multiline comments.
+     *
+     * Breakdown:
+     *  (^|\/)      # matches either the beginning of the string or a directory separator.
+     *  \*\*\/      # matches a recursive directory wildcard "**" followed by a directory separator.
+     *  (.*\/)?     # optionally matches any number of characters followed by a directory separator.
+     *  \.\.        # matches a parent directory path component ".."
+     *  ($|\/)      # matches either the end of the string or a directory separator.
+     */
+    var invalidDotDotAfterRecursiveWildcardPattern = /(^|\/)\*\*\/(.*\/)?\.\.($|\/)/;
+    /**
+     * Tests for a path containing a wildcard character in a directory component of the path.
+     * Matches \*\, \?\, and \a*b\, but not \a\ or \a\*.
+     *
+     * NOTE: used \ in place of / above to avoid issues with multiline comments.
+     *
+     * Breakdown:
+     *  \/          # matches a directory separator.
+     *  [^/]*?      # matches any number of characters excluding directory separators (non-greedy).
+     *  [*?]        # matches either a wildcard character (* or ?)
+     *  [^/]*       # matches any number of characters excluding directory separators (greedy).
+     *  \/          # matches a directory separator.
+     */
+    var watchRecursivePattern = /\/[^/]*?[*?][^/]*\//;
+    /**
+     * Matches the portion of a wildcard path that does not contain wildcards.
+     * Matches \a of \a\*, or \a\b\c of \a\b\c\?\d.
+     *
+     * NOTE: used \ in place of / above to avoid issues with multiline comments.
+     *
+     * Breakdown:
+     *  ^                   # matches the beginning of the string
+     *  [^*?]*              # matches any number of non-wildcard characters
+     *  (?=\/[^/]*[*?])     # lookahead that matches a directory separator followed by
+     *                      # a path component that contains at least one wildcard character (* or ?).
+     */
+    var wildcardDirectoryPattern = /^[^*?]*(?=\/[^/]*[*?])/;
+    /**
+     * Expands an array of file specifications.
+     *
+     * @param filesSpecs The literal file names to include.
+     * @param includeSpecs The wildcard file specifications to include.
+     * @param excludeSpecs The wildcard file specifications to exclude.
+     * @param basePath The base path for any relative file specifications.
+     * @param options Compiler options.
+     * @param host The host used to resolve files and directories.
+     * @param errors An array for diagnostic reporting.
+     */
+    function matchFileNames(filesSpecs, includeSpecs, excludeSpecs, basePath, options, host, errors, extraFileExtensions, jsonSourceFile) {
+        basePath = ts.normalizePath(basePath);
+        var validatedIncludeSpecs, validatedExcludeSpecs;
+        // The exclude spec list is converted into a regular expression, which allows us to quickly
+        // test whether a file or directory should be excluded before recursively traversing the
+        // file system.
+        if (includeSpecs) {
+            validatedIncludeSpecs = validateSpecs(includeSpecs, errors, /*allowTrailingRecursion*/ false, jsonSourceFile, "include");
+        }
+        if (excludeSpecs) {
+            validatedExcludeSpecs = validateSpecs(excludeSpecs, errors, /*allowTrailingRecursion*/ true, jsonSourceFile, "exclude");
+        }
+        // Wildcard directories (provided as part of a wildcard path) are stored in a
+        // file map that marks whether it was a regular wildcard match (with a `*` or `?` token),
+        // or a recursive directory. This information is used by filesystem watchers to monitor for
+        // new entries in these paths.
+        var wildcardDirectories = getWildcardDirectories(validatedIncludeSpecs, validatedExcludeSpecs, basePath, host.useCaseSensitiveFileNames);
+        var spec = { filesSpecs: filesSpecs, referencesSpecs: undefined, includeSpecs: includeSpecs, excludeSpecs: excludeSpecs, validatedIncludeSpecs: validatedIncludeSpecs, validatedExcludeSpecs: validatedExcludeSpecs, wildcardDirectories: wildcardDirectories };
+        return getFileNamesFromConfigSpecs(spec, basePath, options, host, extraFileExtensions);
+    }
+    /**
+     * Gets the file names from the provided config file specs that contain, files, include, exclude and
+     * other properties needed to resolve the file names
+     * @param spec The config file specs extracted with file names to include, wildcards to include/exclude and other details
+     * @param basePath The base path for any relative file specifications.
+     * @param options Compiler options.
+     * @param host The host used to resolve files and directories.
+     * @param extraFileExtensions optionaly file extra file extension information from host
+     */
+    /* @internal */
+    function getFileNamesFromConfigSpecs(spec, basePath, options, host, extraFileExtensions) {
+        if (extraFileExtensions === void 0) { extraFileExtensions = []; }
+        basePath = ts.normalizePath(basePath);
+        var keyMapper = host.useCaseSensitiveFileNames ? ts.identity : ts.toLowerCase;
+        // Literal file names (provided via the "files" array in tsconfig.json) are stored in a
+        // file map with a possibly case insensitive key. We use this map later when when including
+        // wildcard paths.
+        var literalFileMap = ts.createMap();
+        // Wildcard paths (provided via the "includes" array in tsconfig.json) are stored in a
+        // file map with a possibly case insensitive key. We use this map to store paths matched
+        // via wildcard, and to handle extension priority.
+        var wildcardFileMap = ts.createMap();
+        var filesSpecs = spec.filesSpecs, validatedIncludeSpecs = spec.validatedIncludeSpecs, validatedExcludeSpecs = spec.validatedExcludeSpecs, wildcardDirectories = spec.wildcardDirectories;
+        // Rather than requery this for each file and filespec, we query the supported extensions
+        // once and store it on the expansion context.
+        var supportedExtensions = ts.getSupportedExtensions(options, extraFileExtensions);
+        // Literal files are always included verbatim. An "include" or "exclude" specification cannot
+        // remove a literal file.
+        if (filesSpecs) {
+            for (var _i = 0, filesSpecs_1 = filesSpecs; _i < filesSpecs_1.length; _i++) {
+                var fileName = filesSpecs_1[_i];
+                var file = ts.getNormalizedAbsolutePath(fileName, basePath);
+                literalFileMap.set(keyMapper(file), file);
+            }
+        }
+        if (validatedIncludeSpecs && validatedIncludeSpecs.length > 0) {
+            for (var _a = 0, _b = host.readDirectory(basePath, supportedExtensions, validatedExcludeSpecs, validatedIncludeSpecs, /*depth*/ undefined); _a < _b.length; _a++) {
+                var file = _b[_a];
+                // If we have already included a literal or wildcard path with a
+                // higher priority extension, we should skip this file.
+                //
+                // This handles cases where we may encounter both <file>.ts and
+                // <file>.d.ts (or <file>.js if "allowJs" is enabled) in the same
+                // directory when they are compilation outputs.
+                if (hasFileWithHigherPriorityExtension(file, literalFileMap, wildcardFileMap, supportedExtensions, keyMapper)) {
+                    continue;
+                }
+                // We may have included a wildcard path with a lower priority
+                // extension due to the user-defined order of entries in the
+                // "include" array. If there is a lower priority extension in the
+                // same directory, we should remove it.
+                removeWildcardFilesWithLowerPriorityExtension(file, wildcardFileMap, supportedExtensions, keyMapper);
+                var key = keyMapper(file);
+                if (!literalFileMap.has(key) && !wildcardFileMap.has(key)) {
+                    wildcardFileMap.set(key, file);
+                }
+            }
+        }
+        var literalFiles = ts.arrayFrom(literalFileMap.values());
+        var wildcardFiles = ts.arrayFrom(wildcardFileMap.values());
+        var projectReferences = spec.referencesSpecs && spec.referencesSpecs.map(function (r) {
+            return __assign({}, r, { path: ts.getNormalizedAbsolutePath(r.path, basePath) });
+        });
+        return {
+            fileNames: literalFiles.concat(wildcardFiles),
+            projectReferences: projectReferences,
+            wildcardDirectories: wildcardDirectories,
+            spec: spec
+        };
+    }
+    ts.getFileNamesFromConfigSpecs = getFileNamesFromConfigSpecs;
+    function validateSpecs(specs, errors, allowTrailingRecursion, jsonSourceFile, specKey) {
+        return specs.filter(function (spec) {
+            var diag = specToDiagnostic(spec, allowTrailingRecursion);
+            if (diag !== undefined) {
+                errors.push(createDiagnostic(diag, spec));
+            }
+            return diag === undefined;
+        });
+        function createDiagnostic(message, spec) {
+            var element = ts.getTsConfigPropArrayElementValue(jsonSourceFile, specKey, spec);
+            return element ?
+                ts.createDiagnosticForNodeInSourceFile(jsonSourceFile, element, message, spec) :
+                ts.createCompilerDiagnostic(message, spec);
+        }
+    }
+    function specToDiagnostic(spec, allowTrailingRecursion) {
+        if (!allowTrailingRecursion && invalidTrailingRecursionPattern.test(spec)) {
+            return ts.Diagnostics.File_specification_cannot_end_in_a_recursive_directory_wildcard_Asterisk_Asterisk_Colon_0;
+        }
+        else if (invalidDotDotAfterRecursiveWildcardPattern.test(spec)) {
+            return ts.Diagnostics.File_specification_cannot_contain_a_parent_directory_that_appears_after_a_recursive_directory_wildcard_Asterisk_Asterisk_Colon_0;
+        }
+    }
+    /**
+     * Gets directories in a set of include patterns that should be watched for changes.
+     */
+    function getWildcardDirectories(include, exclude, path, useCaseSensitiveFileNames) {
+        // We watch a directory recursively if it contains a wildcard anywhere in a directory segment
+        // of the pattern:
+        //
+        //  /a/b/**/d   - Watch /a/b recursively to catch changes to any d in any subfolder recursively
+        //  /a/b/*/d    - Watch /a/b recursively to catch any d in any immediate subfolder, even if a new subfolder is added
+        //  /a/b        - Watch /a/b recursively to catch changes to anything in any recursive subfoler
+        //
+        // We watch a directory without recursion if it contains a wildcard in the file segment of
+        // the pattern:
+        //
+        //  /a/b/*      - Watch /a/b directly to catch any new file
+        //  /a/b/a?z    - Watch /a/b directly to catch any new file matching a?z
+        var rawExcludeRegex = ts.getRegularExpressionForWildcard(exclude, path, "exclude");
+        var excludeRegex = rawExcludeRegex && new RegExp(rawExcludeRegex, useCaseSensitiveFileNames ? "" : "i");
+        var wildcardDirectories = {};
+        if (include !== undefined) {
+            var recursiveKeys = [];
+            for (var _i = 0, include_1 = include; _i < include_1.length; _i++) {
+                var file = include_1[_i];
+                var spec = ts.normalizePath(ts.combinePaths(path, file));
+                if (excludeRegex && excludeRegex.test(spec)) {
+                    continue;
+                }
+                var match = getWildcardDirectoryFromSpec(spec, useCaseSensitiveFileNames);
+                if (match) {
+                    var key = match.key, flags = match.flags;
+                    var existingFlags = wildcardDirectories[key];
+                    if (existingFlags === undefined || existingFlags < flags) {
+                        wildcardDirectories[key] = flags;
+                        if (flags === 1 /* Recursive */) {
+                            recursiveKeys.push(key);
+                        }
+                    }
+                }
+            }
+            // Remove any subpaths under an existing recursively watched directory.
+            for (var key in wildcardDirectories) {
+                if (ts.hasProperty(wildcardDirectories, key)) {
+                    for (var _a = 0, recursiveKeys_1 = recursiveKeys; _a < recursiveKeys_1.length; _a++) {
+                        var recursiveKey = recursiveKeys_1[_a];
+                        if (key !== recursiveKey && ts.containsPath(recursiveKey, key, path, !useCaseSensitiveFileNames)) {
+                            delete wildcardDirectories[key];
+                        }
+                    }
+                }
+            }
+        }
+        return wildcardDirectories;
+    }
+    function getWildcardDirectoryFromSpec(spec, useCaseSensitiveFileNames) {
+        var match = wildcardDirectoryPattern.exec(spec);
+        if (match) {
+            return {
+                key: useCaseSensitiveFileNames ? match[0] : match[0].toLowerCase(),
+                flags: watchRecursivePattern.test(spec) ? 1 /* Recursive */ : 0 /* None */
+            };
+        }
+        if (ts.isImplicitGlob(spec)) {
+            return { key: spec, flags: 1 /* Recursive */ };
+        }
+        return undefined;
+    }
+    /**
+     * Determines whether a literal or wildcard file has already been included that has a higher
+     * extension priority.
+     *
+     * @param file The path to the file.
+     * @param extensionPriority The priority of the extension.
+     * @param context The expansion context.
+     */
+    function hasFileWithHigherPriorityExtension(file, literalFiles, wildcardFiles, extensions, keyMapper) {
+        var extensionPriority = ts.getExtensionPriority(file, extensions);
+        var adjustedExtensionPriority = ts.adjustExtensionPriority(extensionPriority, extensions);
+        for (var i = 0 /* Highest */; i < adjustedExtensionPriority; i++) {
+            var higherPriorityExtension = extensions[i];
+            var higherPriorityPath = keyMapper(ts.changeExtension(file, higherPriorityExtension));
+            if (literalFiles.has(higherPriorityPath) || wildcardFiles.has(higherPriorityPath)) {
+                return true;
+            }
+        }
+        return false;
+    }
+    /**
+     * Removes files included via wildcard expansion with a lower extension priority that have
+     * already been included.
+     *
+     * @param file The path to the file.
+     * @param extensionPriority The priority of the extension.
+     * @param context The expansion context.
+     */
+    function removeWildcardFilesWithLowerPriorityExtension(file, wildcardFiles, extensions, keyMapper) {
+        var extensionPriority = ts.getExtensionPriority(file, extensions);
+        var nextExtensionPriority = ts.getNextLowestExtensionPriority(extensionPriority, extensions);
+        for (var i = nextExtensionPriority; i < extensions.length; i++) {
+            var lowerPriorityExtension = extensions[i];
+            var lowerPriorityPath = keyMapper(ts.changeExtension(file, lowerPriorityExtension));
+            wildcardFiles.delete(lowerPriorityPath);
+        }
+    }
+    /**
+     * Produces a cleaned version of compiler options with personally identifiying info (aka, paths) removed.
+     * Also converts enum values back to strings.
+     */
+    /* @internal */
+    function convertCompilerOptionsForTelemetry(opts) {
+        var out = {};
+        for (var key in opts) {
+            if (opts.hasOwnProperty(key)) {
+                var type = getOptionFromName(key);
+                if (type !== undefined) { // Ignore unknown options
+                    out[key] = getOptionValueWithEmptyStrings(opts[key], type);
+                }
+            }
+        }
+        return out;
+    }
+    ts.convertCompilerOptionsForTelemetry = convertCompilerOptionsForTelemetry;
+    function getOptionValueWithEmptyStrings(value, option) {
+        switch (option.type) {
+            case "object": // "paths". Can't get any useful information from the value since we blank out strings, so just return "".
+                return "";
+            case "string": // Could be any arbitrary string -- use empty string instead.
+                return "";
+            case "number": // Allow numbers, but be sure to check it's actually a number.
+                return typeof value === "number" ? value : "";
+            case "boolean":
+                return typeof value === "boolean" ? value : "";
+            case "list":
+                var elementType_1 = option.element;
+                return ts.isArray(value) ? value.map(function (v) { return getOptionValueWithEmptyStrings(v, elementType_1); }) : "";
+            default:
+                return ts.forEachEntry(option.type, function (optionEnumValue, optionStringValue) {
+                    if (optionEnumValue === value) {
+                        return optionStringValue;
+                    }
+                }); // TODO: GH#18217
+        }
+    }
+})(ts || (ts = {}));
+var ts;
+(function (ts) {
+    function trace(host) {
+        host.trace(ts.formatMessage.apply(undefined, arguments));
+    }
+    ts.trace = trace;
+    /* @internal */
+    function isTraceEnabled(compilerOptions, host) {
+        return !!compilerOptions.traceResolution && host.trace !== undefined;
+    }
+    ts.isTraceEnabled = isTraceEnabled;
+    function withPackageId(packageId, r) {
+        return r && { path: r.path, extension: r.ext, packageId: packageId };
+    }
+    function noPackageId(r) {
+        return withPackageId(/*packageId*/ undefined, r);
+    }
+    /**
+     * Kinds of file that we are currently looking for.
+     * Typically there is one pass with Extensions.TypeScript, then a second pass with Extensions.JavaScript.
+     */
+    var Extensions;
+    (function (Extensions) {
+        Extensions[Extensions["TypeScript"] = 0] = "TypeScript";
+        Extensions[Extensions["JavaScript"] = 1] = "JavaScript";
+        Extensions[Extensions["Json"] = 2] = "Json";
+        Extensions[Extensions["DtsOnly"] = 3] = "DtsOnly"; /** Only '.d.ts' */
+    })(Extensions || (Extensions = {}));
+    /** Used with `Extensions.DtsOnly` to extract the path from TypeScript results. */
+    function resolvedTypeScriptOnly(resolved) {
+        if (!resolved) {
+            return undefined;
+        }
+        ts.Debug.assert(ts.extensionIsTypeScript(resolved.extension));
+        return { fileName: resolved.path, packageId: resolved.packageId };
+    }
+    function createResolvedModuleWithFailedLookupLocations(resolved, originalPath, isExternalLibraryImport, failedLookupLocations) {
+        return {
+            resolvedModule: resolved && { resolvedFileName: resolved.path, originalPath: originalPath, extension: resolved.extension, isExternalLibraryImport: isExternalLibraryImport, packageId: resolved.packageId },
+            failedLookupLocations: failedLookupLocations
+        };
+    }
+    /** Reads from "main" or "types"/"typings" depending on `extensions`. */
+    function tryReadPackageJsonFields(readTypes, jsonContent, baseDirectory, state) {
+        return readTypes ? tryReadFromField("typings") || tryReadFromField("types") : tryReadFromField("main");
+        function tryReadFromField(fieldName) {
+            if (!ts.hasProperty(jsonContent, fieldName)) {
+                if (state.traceEnabled) {
+                    trace(state.host, ts.Diagnostics.package_json_does_not_have_a_0_field, fieldName);
+                }
+                return;
+            }
+            var fileName = jsonContent[fieldName];
+            if (!ts.isString(fileName)) {
+                if (state.traceEnabled) {
+                    trace(state.host, ts.Diagnostics.Expected_type_of_0_field_in_package_json_to_be_string_got_1, fieldName, typeof fileName);
+                }
+                return;
+            }
+            var path = ts.normalizePath(ts.combinePaths(baseDirectory, fileName));
+            if (state.traceEnabled) {
+                trace(state.host, ts.Diagnostics.package_json_has_0_field_1_that_references_2, fieldName, fileName, path);
+            }
+            return path;
+        }
+    }
+    /* @internal */
+    function readJson(path, host) {
+        try {
+            var jsonText = host.readFile(path);
+            if (!jsonText)
+                return {};
+            var result = ts.parseConfigFileTextToJson(path, jsonText);
+            if (result.error) {
+                return {};
+            }
+            return result.config;
+        }
+        catch (e) {
+            // gracefully handle if readFile fails or returns not JSON
+            return {};
+        }
+    }
+    ts.readJson = readJson;
+    function getEffectiveTypeRoots(options, host) {
+        if (options.typeRoots) {
+            return options.typeRoots;
+        }
+        var currentDirectory;
+        if (options.configFilePath) {
+            currentDirectory = ts.getDirectoryPath(options.configFilePath);
+        }
+        else if (host.getCurrentDirectory) {
+            currentDirectory = host.getCurrentDirectory();
+        }
+        if (currentDirectory !== undefined) {
+            return getDefaultTypeRoots(currentDirectory, host);
+        }
+    }
+    ts.getEffectiveTypeRoots = getEffectiveTypeRoots;
+    /**
+     * Returns the path to every node_modules/@types directory from some ancestor directory.
+     * Returns undefined if there are none.
+     */
+    function getDefaultTypeRoots(currentDirectory, host) {
+        if (!host.directoryExists) {
+            return [ts.combinePaths(currentDirectory, nodeModulesAtTypes)];
+            // And if it doesn't exist, tough.
+        }
+        var typeRoots;
+        ts.forEachAncestorDirectory(ts.normalizePath(currentDirectory), function (directory) {
+            var atTypes = ts.combinePaths(directory, nodeModulesAtTypes);
+            if (host.directoryExists(atTypes)) {
+                (typeRoots || (typeRoots = [])).push(atTypes);
+            }
+            return undefined;
+        });
+        return typeRoots;
+    }
+    var nodeModulesAtTypes = ts.combinePaths("node_modules", "@types");
+    /**
+     * @param {string | undefined} containingFile - file that contains type reference directive, can be undefined if containing file is unknown.
+     * This is possible in case if resolution is performed for directives specified via 'types' parameter. In this case initial path for secondary lookups
+     * is assumed to be the same as root directory of the project.
+     */
+    function resolveTypeReferenceDirective(typeReferenceDirectiveName, containingFile, options, host) {
+        var traceEnabled = isTraceEnabled(options, host);
+        var moduleResolutionState = { compilerOptions: options, host: host, traceEnabled: traceEnabled };
+        var typeRoots = getEffectiveTypeRoots(options, host);
+        if (traceEnabled) {
+            if (containingFile === undefined) {
+                if (typeRoots === undefined) {
+                    trace(host, ts.Diagnostics.Resolving_type_reference_directive_0_containing_file_not_set_root_directory_not_set, typeReferenceDirectiveName);
+                }
+                else {
+                    trace(host, ts.Diagnostics.Resolving_type_reference_directive_0_containing_file_not_set_root_directory_1, typeReferenceDirectiveName, typeRoots);
+                }
+            }
+            else {
+                if (typeRoots === undefined) {
+                    trace(host, ts.Diagnostics.Resolving_type_reference_directive_0_containing_file_1_root_directory_not_set, typeReferenceDirectiveName, containingFile);
+                }
+                else {
+                    trace(host, ts.Diagnostics.Resolving_type_reference_directive_0_containing_file_1_root_directory_2, typeReferenceDirectiveName, containingFile, typeRoots);
+                }
+            }
+        }
+        var failedLookupLocations = [];
+        var resolved = primaryLookup();
+        var primary = true;
+        if (!resolved) {
+            resolved = secondaryLookup();
+            primary = false;
+        }
+        var resolvedTypeReferenceDirective;
+        if (resolved) {
+            if (!options.preserveSymlinks) {
+                resolved = __assign({}, resolved, { fileName: realPath(resolved.fileName, host, traceEnabled) });
+            }
+            if (traceEnabled) {
+                trace(host, ts.Diagnostics.Type_reference_directive_0_was_successfully_resolved_to_1_primary_Colon_2, typeReferenceDirectiveName, resolved.fileName, primary);
+            }
+            resolvedTypeReferenceDirective = { primary: primary, resolvedFileName: resolved.fileName, packageId: resolved.packageId };
+        }
+        return { resolvedTypeReferenceDirective: resolvedTypeReferenceDirective, failedLookupLocations: failedLookupLocations };
+        function primaryLookup() {
+            // Check primary library paths
+            if (typeRoots && typeRoots.length) {
+                if (traceEnabled) {
+                    trace(host, ts.Diagnostics.Resolving_with_primary_search_path_0, typeRoots.join(", "));
+                }
+                return ts.forEach(typeRoots, function (typeRoot) {
+                    var candidate = ts.combinePaths(typeRoot, typeReferenceDirectiveName);
+                    var candidateDirectory = ts.getDirectoryPath(candidate);
+                    var directoryExists = directoryProbablyExists(candidateDirectory, host);
+                    if (!directoryExists && traceEnabled) {
+                        trace(host, ts.Diagnostics.Directory_0_does_not_exist_skipping_all_lookups_in_it, candidateDirectory);
+                    }
+                    return resolvedTypeScriptOnly(loadNodeModuleFromDirectory(Extensions.DtsOnly, candidate, failedLookupLocations, !directoryExists, moduleResolutionState));
+                });
+            }
+            else {
+                if (traceEnabled) {
+                    trace(host, ts.Diagnostics.Root_directory_cannot_be_determined_skipping_primary_search_paths);
+                }
+            }
+        }
+        function secondaryLookup() {
+            var initialLocationForSecondaryLookup = containingFile && ts.getDirectoryPath(containingFile);
+            if (initialLocationForSecondaryLookup !== undefined) {
+                // check secondary locations
+                if (traceEnabled) {
+                    trace(host, ts.Diagnostics.Looking_up_in_node_modules_folder_initial_location_0, initialLocationForSecondaryLookup);
+                }
+                var result = loadModuleFromNodeModules(Extensions.DtsOnly, typeReferenceDirectiveName, initialLocationForSecondaryLookup, failedLookupLocations, moduleResolutionState, /*cache*/ undefined);
+                var resolvedFile = resolvedTypeScriptOnly(result && result.value);
+                if (!resolvedFile && traceEnabled) {
+                    trace(host, ts.Diagnostics.Type_reference_directive_0_was_not_resolved, typeReferenceDirectiveName);
+                }
+                return resolvedFile;
+            }
+            else {
+                if (traceEnabled) {
+                    trace(host, ts.Diagnostics.Containing_file_is_not_specified_and_root_directory_cannot_be_determined_skipping_lookup_in_node_modules_folder);
+                }
+            }
+        }
+    }
+    ts.resolveTypeReferenceDirective = resolveTypeReferenceDirective;
+    /**
+     * Given a set of options, returns the set of type directive names
+     *   that should be included for this program automatically.
+     * This list could either come from the config file,
+     *   or from enumerating the types root + initial secondary types lookup location.
+     * More type directives might appear in the program later as a result of loading actual source files;
+     *   this list is only the set of defaults that are implicitly included.
+     */
+    function getAutomaticTypeDirectiveNames(options, host) {
+        // Use explicit type list from tsconfig.json
+        if (options.types) {
+            return options.types;
+        }
+        // Walk the primary type lookup locations
+        var result = [];
+        if (host.directoryExists && host.getDirectories) {
+            var typeRoots = getEffectiveTypeRoots(options, host);
+            if (typeRoots) {
+                for (var _i = 0, typeRoots_1 = typeRoots; _i < typeRoots_1.length; _i++) {
+                    var root = typeRoots_1[_i];
+                    if (host.directoryExists(root)) {
+                        for (var _a = 0, _b = host.getDirectories(root); _a < _b.length; _a++) {
+                            var typeDirectivePath = _b[_a];
+                            var normalized = ts.normalizePath(typeDirectivePath);
+                            var packageJsonPath = pathToPackageJson(ts.combinePaths(root, normalized));
+                            // `types-publisher` sometimes creates packages with `"typings": null` for packages that don't provide their own types.
+                            // See `createNotNeededPackageJSON` in the types-publisher` repo.
+                            // tslint:disable-next-line:no-null-keyword
+                            var isNotNeededPackage = host.fileExists(packageJsonPath) && readJson(packageJsonPath, host).typings === null;
+                            if (!isNotNeededPackage) {
+                                // Return just the type directive names
+                                result.push(ts.getBaseFileName(normalized));
+                            }
+                        }
+                    }
+                }
+            }
+        }
+        return result;
+    }
+    ts.getAutomaticTypeDirectiveNames = getAutomaticTypeDirectiveNames;
+    function createModuleResolutionCache(currentDirectory, getCanonicalFileName) {
+        return createModuleResolutionCacheWithMaps(ts.createMap(), ts.createMap(), currentDirectory, getCanonicalFileName);
+    }
+    ts.createModuleResolutionCache = createModuleResolutionCache;
+    /*@internal*/
+    function createModuleResolutionCacheWithMaps(directoryToModuleNameMap, moduleNameToDirectoryMap, currentDirectory, getCanonicalFileName) {
+        return { getOrCreateCacheForDirectory: getOrCreateCacheForDirectory, getOrCreateCacheForModuleName: getOrCreateCacheForModuleName };
+        function getOrCreateCacheForDirectory(directoryName) {
+            var path = ts.toPath(directoryName, currentDirectory, getCanonicalFileName);
+            var perFolderCache = directoryToModuleNameMap.get(path);
+            if (!perFolderCache) {
+                perFolderCache = ts.createMap();
+                directoryToModuleNameMap.set(path, perFolderCache);
+            }
+            return perFolderCache;
+        }
+        function getOrCreateCacheForModuleName(nonRelativeModuleName) {
+            if (ts.isExternalModuleNameRelative(nonRelativeModuleName)) {
+                return undefined; // TODO: GH#18217
+            }
+            var perModuleNameCache = moduleNameToDirectoryMap.get(nonRelativeModuleName);
+            if (!perModuleNameCache) {
+                perModuleNameCache = createPerModuleNameCache();
+                moduleNameToDirectoryMap.set(nonRelativeModuleName, perModuleNameCache);
+            }
+            return perModuleNameCache;
+        }
+        function createPerModuleNameCache() {
+            var directoryPathMap = ts.createMap();
+            return { get: get, set: set };
+            function get(directory) {
+                return directoryPathMap.get(ts.toPath(directory, currentDirectory, getCanonicalFileName));
+            }
+            /**
+             * At first this function add entry directory -> module resolution result to the table.
+             * Then it computes the set of parent folders for 'directory' that should have the same module resolution result
+             * and for every parent folder in set it adds entry: parent -> module resolution. .
+             * Lets say we first directory name: /a/b/c/d/e and resolution result is: /a/b/bar.ts.
+             * Set of parent folders that should have the same result will be:
+             * [
+             *     /a/b/c/d, /a/b/c, /a/b
+             * ]
+             * this means that request for module resolution from file in any of these folder will be immediately found in cache.
+             */
+            function set(directory, result) {
+                var path = ts.toPath(directory, currentDirectory, getCanonicalFileName);
+                // if entry is already in cache do nothing
+                if (directoryPathMap.has(path)) {
+                    return;
+                }
+                directoryPathMap.set(path, result);
+                var resolvedFileName = result.resolvedModule && result.resolvedModule.resolvedFileName;
+                // find common prefix between directory and resolved file name
+                // this common prefix should be the shorted path that has the same resolution
+                // directory: /a/b/c/d/e
+                // resolvedFileName: /a/b/foo.d.ts
+                var commonPrefix = getCommonPrefix(path, resolvedFileName);
+                var current = path;
+                while (true) {
+                    var parent = ts.getDirectoryPath(current);
+                    if (parent === current || directoryPathMap.has(parent)) {
+                        break;
+                    }
+                    directoryPathMap.set(parent, result);
+                    current = parent;
+                    if (current === commonPrefix) {
+                        break;
+                    }
+                }
+            }
+            function getCommonPrefix(directory, resolution) {
+                if (resolution === undefined) {
+                    return undefined;
+                }
+                var resolutionDirectory = ts.toPath(ts.getDirectoryPath(resolution), currentDirectory, getCanonicalFileName);
+                // find first position where directory and resolution differs
+                var i = 0;
+                while (i < Math.min(directory.length, resolutionDirectory.length) && directory.charCodeAt(i) === resolutionDirectory.charCodeAt(i)) {
+                    i++;
+                }
+                // find last directory separator before position i
+                var sep = directory.lastIndexOf(ts.directorySeparator, i);
+                if (sep < 0) {
+                    return undefined;
+                }
+                return directory.substr(0, sep);
+            }
+        }
+    }
+    ts.createModuleResolutionCacheWithMaps = createModuleResolutionCacheWithMaps;
+    function resolveModuleNameFromCache(moduleName, containingFile, cache) {
+        var containingDirectory = ts.getDirectoryPath(containingFile);
+        var perFolderCache = cache && cache.getOrCreateCacheForDirectory(containingDirectory);
+        return perFolderCache && perFolderCache.get(moduleName);
+    }
+    ts.resolveModuleNameFromCache = resolveModuleNameFromCache;
+    function resolveModuleName(moduleName, containingFile, compilerOptions, host, cache) {
+        var traceEnabled = isTraceEnabled(compilerOptions, host);
+        if (traceEnabled) {
+            trace(host, ts.Diagnostics.Resolving_module_0_from_1, moduleName, containingFile);
+        }
+        var containingDirectory = ts.getDirectoryPath(containingFile);
+        var perFolderCache = cache && cache.getOrCreateCacheForDirectory(containingDirectory);
+        var result = perFolderCache && perFolderCache.get(moduleName);
+        if (result) {
+            if (traceEnabled) {
+                trace(host, ts.Diagnostics.Resolution_for_module_0_was_found_in_cache_from_location_1, moduleName, containingDirectory);
+            }
+        }
+        else {
+            var moduleResolution = compilerOptions.moduleResolution;
+            if (moduleResolution === undefined) {
+                moduleResolution = ts.getEmitModuleKind(compilerOptions) === ts.ModuleKind.CommonJS ? ts.ModuleResolutionKind.NodeJs : ts.ModuleResolutionKind.Classic;
+                if (traceEnabled) {
+                    trace(host, ts.Diagnostics.Module_resolution_kind_is_not_specified_using_0, ts.ModuleResolutionKind[moduleResolution]);
+                }
+            }
+            else {
+                if (traceEnabled) {
+                    trace(host, ts.Diagnostics.Explicitly_specified_module_resolution_kind_Colon_0, ts.ModuleResolutionKind[moduleResolution]);
+                }
+            }
+            switch (moduleResolution) {
+                case ts.ModuleResolutionKind.NodeJs:
+                    result = nodeModuleNameResolver(moduleName, containingFile, compilerOptions, host, cache);
+                    break;
+                case ts.ModuleResolutionKind.Classic:
+                    result = classicNameResolver(moduleName, containingFile, compilerOptions, host, cache);
+                    break;
+                default:
+                    return ts.Debug.fail("Unexpected moduleResolution: " + moduleResolution);
+            }
+            if (perFolderCache) {
+                perFolderCache.set(moduleName, result);
+                // put result in per-module name cache
+                var perModuleNameCache = cache.getOrCreateCacheForModuleName(moduleName);
+                if (perModuleNameCache) {
+                    perModuleNameCache.set(containingDirectory, result);
+                }
+            }
+        }
+        if (traceEnabled) {
+            if (result.resolvedModule) {
+                trace(host, ts.Diagnostics.Module_name_0_was_successfully_resolved_to_1, moduleName, result.resolvedModule.resolvedFileName);
+            }
+            else {
+                trace(host, ts.Diagnostics.Module_name_0_was_not_resolved, moduleName);
+            }
+        }
+        return result;
+    }
+    ts.resolveModuleName = resolveModuleName;
+    /**
+     * Any module resolution kind can be augmented with optional settings: 'baseUrl', 'paths' and 'rootDirs' - they are used to
+     * mitigate differences between design time structure of the project and its runtime counterpart so the same import name
+     * can be resolved successfully by TypeScript compiler and runtime module loader.
+     * If these settings are set then loading procedure will try to use them to resolve module name and it can of failure it will
+     * fallback to standard resolution routine.
+     *
+     * - baseUrl - this setting controls how non-relative module names are resolved. If this setting is specified then non-relative
+     * names will be resolved relative to baseUrl: i.e. if baseUrl is '/a/b' then candidate location to resolve module name 'c/d' will
+     * be '/a/b/c/d'
+     * - paths - this setting can only be used when baseUrl is specified. allows to tune how non-relative module names
+     * will be resolved based on the content of the module name.
+     * Structure of 'paths' compiler options
+     * 'paths': {
+     *    pattern-1: [...substitutions],
+     *    pattern-2: [...substitutions],
+     *    ...
+     *    pattern-n: [...substitutions]
+     * }
+     * Pattern here is a string that can contain zero or one '*' character. During module resolution module name will be matched against
+     * all patterns in the list. Matching for patterns that don't contain '*' means that module name must be equal to pattern respecting the case.
+     * If pattern contains '*' then to match pattern "<prefix>*<suffix>" module name must start with the <prefix> and end with <suffix>.
+     * <MatchedStar> denotes part of the module name between <prefix> and <suffix>.
+     * If module name can be matches with multiple patterns then pattern with the longest prefix will be picked.
+     * After selecting pattern we'll use list of substitutions to get candidate locations of the module and the try to load module
+     * from the candidate location.
+     * Substitution is a string that can contain zero or one '*'. To get candidate location from substitution we'll pick every
+     * substitution in the list and replace '*' with <MatchedStar> string. If candidate location is not rooted it
+     * will be converted to absolute using baseUrl.
+     * For example:
+     * baseUrl: /a/b/c
+     * "paths": {
+     *     // match all module names
+     *     "*": [
+     *         "*",        // use matched name as is,
+     *                     // <matched name> will be looked as /a/b/c/<matched name>
+     *
+     *         "folder1/*" // substitution will convert matched name to 'folder1/<matched name>',
+     *                     // since it is not rooted then final candidate location will be /a/b/c/folder1/<matched name>
+     *     ],
+     *     // match module names that start with 'components/'
+     *     "components/*": [ "/root/components/*" ] // substitution will convert /components/folder1/<matched name> to '/root/components/folder1/<matched name>',
+     *                                              // it is rooted so it will be final candidate location
+     * }
+     *
+     * 'rootDirs' allows the project to be spreaded across multiple locations and resolve modules with relative names as if
+     * they were in the same location. For example lets say there are two files
+     * '/local/src/content/file1.ts'
+     * '/shared/components/contracts/src/content/protocols/file2.ts'
+     * After bundling content of '/shared/components/contracts/src' will be merged with '/local/src' so
+     * if file1 has the following import 'import {x} from "./protocols/file2"' it will be resolved successfully in runtime.
+     * 'rootDirs' provides the way to tell compiler that in order to get the whole project it should behave as if content of all
+     * root dirs were merged together.
+     * I.e. for the example above 'rootDirs' will have two entries: [ '/local/src', '/shared/components/contracts/src' ].
+     * Compiler will first convert './protocols/file2' into absolute path relative to the location of containing file:
+     * '/local/src/content/protocols/file2' and try to load it - failure.
+     * Then it will search 'rootDirs' looking for a longest matching prefix of this absolute path and if such prefix is found - absolute path will
+     * be converted to a path relative to found rootDir entry './content/protocols/file2' (*). As a last step compiler will check all remaining
+     * entries in 'rootDirs', use them to build absolute path out of (*) and try to resolve module from this location.
+     */
+    function tryLoadModuleUsingOptionalResolutionSettings(extensions, moduleName, containingDirectory, loader, failedLookupLocations, state) {
+        if (!ts.isExternalModuleNameRelative(moduleName)) {
+            return tryLoadModuleUsingBaseUrl(extensions, moduleName, loader, failedLookupLocations, state);
+        }
+        else {
+            return tryLoadModuleUsingRootDirs(extensions, moduleName, containingDirectory, loader, failedLookupLocations, state);
+        }
+    }
+    function tryLoadModuleUsingRootDirs(extensions, moduleName, containingDirectory, loader, failedLookupLocations, state) {
+        if (!state.compilerOptions.rootDirs) {
+            return undefined;
+        }
+        if (state.traceEnabled) {
+            trace(state.host, ts.Diagnostics.rootDirs_option_is_set_using_it_to_resolve_relative_module_name_0, moduleName);
+        }
+        var candidate = ts.normalizePath(ts.combinePaths(containingDirectory, moduleName));
+        var matchedRootDir;
+        var matchedNormalizedPrefix;
+        for (var _i = 0, _a = state.compilerOptions.rootDirs; _i < _a.length; _i++) {
+            var rootDir = _a[_i];
+            // rootDirs are expected to be absolute
+            // in case of tsconfig.json this will happen automatically - compiler will expand relative names
+            // using location of tsconfig.json as base location
+            var normalizedRoot = ts.normalizePath(rootDir);
+            if (!ts.endsWith(normalizedRoot, ts.directorySeparator)) {
+                normalizedRoot += ts.directorySeparator;
+            }
+            var isLongestMatchingPrefix = ts.startsWith(candidate, normalizedRoot) &&
+                (matchedNormalizedPrefix === undefined || matchedNormalizedPrefix.length < normalizedRoot.length);
+            if (state.traceEnabled) {
+                trace(state.host, ts.Diagnostics.Checking_if_0_is_the_longest_matching_prefix_for_1_2, normalizedRoot, candidate, isLongestMatchingPrefix);
+            }
+            if (isLongestMatchingPrefix) {
+                matchedNormalizedPrefix = normalizedRoot;
+                matchedRootDir = rootDir;
+            }
+        }
+        if (matchedNormalizedPrefix) {
+            if (state.traceEnabled) {
+                trace(state.host, ts.Diagnostics.Longest_matching_prefix_for_0_is_1, candidate, matchedNormalizedPrefix);
+            }
+            var suffix = candidate.substr(matchedNormalizedPrefix.length);
+            // first - try to load from a initial location
+            if (state.traceEnabled) {
+                trace(state.host, ts.Diagnostics.Loading_0_from_the_root_dir_1_candidate_location_2, suffix, matchedNormalizedPrefix, candidate);
+            }
+            var resolvedFileName = loader(extensions, candidate, failedLookupLocations, !directoryProbablyExists(containingDirectory, state.host), state);
+            if (resolvedFileName) {
+                return resolvedFileName;
+            }
+            if (state.traceEnabled) {
+                trace(state.host, ts.Diagnostics.Trying_other_entries_in_rootDirs);
+            }
+            // then try to resolve using remaining entries in rootDirs
+            for (var _b = 0, _c = state.compilerOptions.rootDirs; _b < _c.length; _b++) {
+                var rootDir = _c[_b];
+                if (rootDir === matchedRootDir) {
+                    // skip the initially matched entry
+                    continue;
+                }
+                var candidate_1 = ts.combinePaths(ts.normalizePath(rootDir), suffix);
+                if (state.traceEnabled) {
+                    trace(state.host, ts.Diagnostics.Loading_0_from_the_root_dir_1_candidate_location_2, suffix, rootDir, candidate_1);
+                }
+                var baseDirectory = ts.getDirectoryPath(candidate_1);
+                var resolvedFileName_1 = loader(extensions, candidate_1, failedLookupLocations, !directoryProbablyExists(baseDirectory, state.host), state);
+                if (resolvedFileName_1) {
+                    return resolvedFileName_1;
+                }
+            }
+            if (state.traceEnabled) {
+                trace(state.host, ts.Diagnostics.Module_resolution_using_rootDirs_has_failed);
+            }
+        }
+        return undefined;
+    }
+    function tryLoadModuleUsingBaseUrl(extensions, moduleName, loader, failedLookupLocations, state) {
+        if (!state.compilerOptions.baseUrl) {
+            return undefined;
+        }
+        if (state.traceEnabled) {
+            trace(state.host, ts.Diagnostics.baseUrl_option_is_set_to_0_using_this_value_to_resolve_non_relative_module_name_1, state.compilerOptions.baseUrl, moduleName);
+        }
+        // string is for exact match
+        var matchedPattern;
+        if (state.compilerOptions.paths) {
+            if (state.traceEnabled) {
+                trace(state.host, ts.Diagnostics.paths_option_is_specified_looking_for_a_pattern_to_match_module_name_0, moduleName);
+            }
+            matchedPattern = ts.matchPatternOrExact(ts.getOwnKeys(state.compilerOptions.paths), moduleName);
+        }
+        if (matchedPattern) {
+            var matchedStar_1 = ts.isString(matchedPattern) ? undefined : ts.matchedText(matchedPattern, moduleName);
+            var matchedPatternText = ts.isString(matchedPattern) ? matchedPattern : ts.patternText(matchedPattern);
+            if (state.traceEnabled) {
+                trace(state.host, ts.Diagnostics.Module_name_0_matched_pattern_1, moduleName, matchedPatternText);
+            }
+            return ts.forEach(state.compilerOptions.paths[matchedPatternText], function (subst) {
+                var path = matchedStar_1 ? subst.replace("*", matchedStar_1) : subst;
+                var candidate = ts.normalizePath(ts.combinePaths(state.compilerOptions.baseUrl, path));
+                if (state.traceEnabled) {
+                    trace(state.host, ts.Diagnostics.Trying_substitution_0_candidate_module_location_Colon_1, subst, path);
+                }
+                // A path mapping may have an extension, in contrast to an import, which should omit it.
+                var extension = ts.tryGetExtensionFromPath(candidate);
+                if (extension !== undefined) {
+                    var path_1 = tryFile(candidate, failedLookupLocations, /*onlyRecordFailures*/ false, state);
+                    if (path_1 !== undefined) {
+                        return noPackageId({ path: path_1, ext: extension });
+                    }
+                }
+                return loader(extensions, candidate, failedLookupLocations, !directoryProbablyExists(ts.getDirectoryPath(candidate), state.host), state);
+            });
+        }
+        else {
+            var candidate = ts.normalizePath(ts.combinePaths(state.compilerOptions.baseUrl, moduleName));
+            if (state.traceEnabled) {
+                trace(state.host, ts.Diagnostics.Resolving_module_name_0_relative_to_base_url_1_2, moduleName, state.compilerOptions.baseUrl, candidate);
+            }
+            return loader(extensions, candidate, failedLookupLocations, !directoryProbablyExists(ts.getDirectoryPath(candidate), state.host), state);
+        }
+    }
+    function nodeModuleNameResolver(moduleName, containingFile, compilerOptions, host, cache) {
+        return nodeModuleNameResolverWorker(moduleName, ts.getDirectoryPath(containingFile), compilerOptions, host, cache, /*jsOnly*/ false);
+    }
+    ts.nodeModuleNameResolver = nodeModuleNameResolver;
+    /**
+     * Expose resolution logic to allow us to use Node module resolution logic from arbitrary locations.
+     * No way to do this with `require()`: https://github.com/nodejs/node/issues/5963
+     * Throws an error if the module can't be resolved.
+     */
+    /* @internal */
+    function resolveJavaScriptModule(moduleName, initialDir, host) {
+        var _a = nodeModuleNameResolverWorker(moduleName, initialDir, { moduleResolution: ts.ModuleResolutionKind.NodeJs, allowJs: true }, host, /*cache*/ undefined, /*jsOnly*/ true), resolvedModule = _a.resolvedModule, failedLookupLocations = _a.failedLookupLocations;
+        if (!resolvedModule) {
+            throw new Error("Could not resolve JS module '" + moduleName + "' starting at '" + initialDir + "'. Looked in: " + failedLookupLocations.join(", "));
+        }
+        return resolvedModule.resolvedFileName;
+    }
+    ts.resolveJavaScriptModule = resolveJavaScriptModule;
+    function nodeModuleNameResolverWorker(moduleName, containingDirectory, compilerOptions, host, cache, jsOnly) {
+        var traceEnabled = isTraceEnabled(compilerOptions, host);
+        var failedLookupLocations = [];
+        var state = { compilerOptions: compilerOptions, host: host, traceEnabled: traceEnabled };
+        var result = jsOnly ?
+            tryResolve(Extensions.JavaScript) :
+            (tryResolve(Extensions.TypeScript) ||
+                tryResolve(Extensions.JavaScript) ||
+                (compilerOptions.resolveJsonModule ? tryResolve(Extensions.Json) : undefined));
+        if (result && result.value) {
+            var _a = result.value, resolved = _a.resolved, originalPath = _a.originalPath, isExternalLibraryImport = _a.isExternalLibraryImport;
+            return createResolvedModuleWithFailedLookupLocations(resolved, originalPath, isExternalLibraryImport, failedLookupLocations);
+        }
+        return { resolvedModule: undefined, failedLookupLocations: failedLookupLocations };
+        function tryResolve(extensions) {
+            var loader = function (extensions, candidate, failedLookupLocations, onlyRecordFailures, state) { return nodeLoadModuleByRelativeName(extensions, candidate, failedLookupLocations, onlyRecordFailures, state, /*considerPackageJson*/ true); };
+            var resolved = tryLoadModuleUsingOptionalResolutionSettings(extensions, moduleName, containingDirectory, loader, failedLookupLocations, state);
+            if (resolved) {
+                return toSearchResult({ resolved: resolved, isExternalLibraryImport: false });
+            }
+            if (!ts.isExternalModuleNameRelative(moduleName)) {
+                if (traceEnabled) {
+                    trace(host, ts.Diagnostics.Loading_module_0_from_node_modules_folder_target_file_type_1, moduleName, Extensions[extensions]);
+                }
+                var resolved_1 = loadModuleFromNodeModules(extensions, moduleName, containingDirectory, failedLookupLocations, state, cache);
+                if (!resolved_1)
+                    return undefined;
+                var resolvedValue = resolved_1.value;
+                var originalPath = void 0;
+                if (!compilerOptions.preserveSymlinks && resolvedValue) {
+                    originalPath = resolvedValue.path;
+                    var path = realPath(resolvedValue.path, host, traceEnabled);
+                    if (path === originalPath) {
+                        originalPath = undefined;
+                    }
+                    resolvedValue = __assign({}, resolvedValue, { path: path });
+                }
+                // For node_modules lookups, get the real path so that multiple accesses to an `npm link`-ed module do not create duplicate files.
+                return { value: resolvedValue && { resolved: resolvedValue, originalPath: originalPath, isExternalLibraryImport: true } };
+            }
+            else {
+                var _a = ts.normalizePathAndParts(ts.combinePaths(containingDirectory, moduleName)), candidate = _a.path, parts = _a.parts;
+                var resolved_2 = nodeLoadModuleByRelativeName(extensions, candidate, failedLookupLocations, /*onlyRecordFailures*/ false, state, /*considerPackageJson*/ true);
+                // Treat explicit "node_modules" import as an external library import.
+                return resolved_2 && toSearchResult({ resolved: resolved_2, isExternalLibraryImport: ts.contains(parts, "node_modules") });
+            }
+        }
+    }
+    function realPath(path, host, traceEnabled) {
+        if (!host.realpath) {
+            return path;
+        }
+        var real = ts.normalizePath(host.realpath(path));
+        if (traceEnabled) {
+            trace(host, ts.Diagnostics.Resolving_real_path_for_0_result_1, path, real);
+        }
+        ts.Debug.assert(host.fileExists(real), path + " linked to nonexistent file " + real); // tslint:disable-line
+        return real;
+    }
+    function nodeLoadModuleByRelativeName(extensions, candidate, failedLookupLocations, onlyRecordFailures, state, considerPackageJson) {
+        if (state.traceEnabled) {
+            trace(state.host, ts.Diagnostics.Loading_module_as_file_Slash_folder_candidate_module_location_0_target_file_type_1, candidate, Extensions[extensions]);
+        }
+        if (!ts.hasTrailingDirectorySeparator(candidate)) {
+            if (!onlyRecordFailures) {
+                var parentOfCandidate = ts.getDirectoryPath(candidate);
+                if (!directoryProbablyExists(parentOfCandidate, state.host)) {
+                    if (state.traceEnabled) {
+                        trace(state.host, ts.Diagnostics.Directory_0_does_not_exist_skipping_all_lookups_in_it, parentOfCandidate);
+                    }
+                    onlyRecordFailures = true;
+                }
+            }
+            var resolvedFromFile = loadModuleFromFile(extensions, candidate, failedLookupLocations, onlyRecordFailures, state);
+            if (resolvedFromFile) {
+                var nm = considerPackageJson ? parseNodeModuleFromPath(resolvedFromFile) : undefined;
+                var packageId = nm && getPackageJsonInfo(nm.packageDirectory, nm.subModuleName, failedLookupLocations, /*onlyRecordFailures*/ false, state).packageId;
+                return withPackageId(packageId, resolvedFromFile);
+            }
+        }
+        if (!onlyRecordFailures) {
+            var candidateExists = directoryProbablyExists(candidate, state.host);
+            if (!candidateExists) {
+                if (state.traceEnabled) {
+                    trace(state.host, ts.Diagnostics.Directory_0_does_not_exist_skipping_all_lookups_in_it, candidate);
+                }
+                onlyRecordFailures = true;
+            }
+        }
+        return loadNodeModuleFromDirectory(extensions, candidate, failedLookupLocations, onlyRecordFailures, state, considerPackageJson);
+    }
+    var nodeModulesPathPart = "/node_modules/";
+    /**
+     * This will be called on the successfully resolved path from `loadModuleFromFile`.
+     * (Not neeeded for `loadModuleFromNodeModules` as that looks up the `package.json` as part of resolution.)
+     *
+     * packageDirectory is the directory of the package itself.
+     * subModuleName is the path within the package.
+     *   For `blah/node_modules/foo/index.d.ts` this is { packageDirectory: "foo", subModuleName: "index.d.ts" }. (Part before "/node_modules/" is ignored.)
+     *   For `/node_modules/foo/bar.d.ts` this is { packageDirectory: "foo", subModuleName": "bar/index.d.ts" }.
+     *   For `/node_modules/@types/foo/bar/index.d.ts` this is { packageDirectory: "@types/foo", subModuleName: "bar/index.d.ts" }.
+     *   For `/node_modules/foo/bar/index.d.ts` this is { packageDirectory: "foo", subModuleName": "bar/index.d.ts" }.
+     */
+    function parseNodeModuleFromPath(resolved) {
+        var path = ts.normalizePath(resolved.path);
+        var idx = path.lastIndexOf(nodeModulesPathPart);
+        if (idx === -1) {
+            return undefined;
+        }
+        var indexAfterNodeModules = idx + nodeModulesPathPart.length;
+        var indexAfterPackageName = moveToNextDirectorySeparatorIfAvailable(path, indexAfterNodeModules);
+        if (path.charCodeAt(indexAfterNodeModules) === 64 /* at */) {
+            indexAfterPackageName = moveToNextDirectorySeparatorIfAvailable(path, indexAfterPackageName);
+        }
+        var packageDirectory = path.slice(0, indexAfterPackageName);
+        var subModuleName = ts.removeExtension(path.slice(indexAfterPackageName + 1), resolved.ext) + ".d.ts" /* Dts */;
+        return { packageDirectory: packageDirectory, subModuleName: subModuleName };
+    }
+    function moveToNextDirectorySeparatorIfAvailable(path, prevSeparatorIndex) {
+        var nextSeparatorIndex = path.indexOf(ts.directorySeparator, prevSeparatorIndex + 1);
+        return nextSeparatorIndex === -1 ? prevSeparatorIndex : nextSeparatorIndex;
+    }
+    function addExtensionAndIndex(path) {
+        if (path === "") {
+            return "index.d.ts";
+        }
+        if (ts.endsWith(path, ".d.ts")) {
+            return path;
+        }
+        if (ts.endsWith(path, "/index")) {
+            return path + ".d.ts";
+        }
+        return path + "/index.d.ts";
+    }
+    /* @internal */
+    function directoryProbablyExists(directoryName, host) {
+        // if host does not support 'directoryExists' assume that directory will exist
+        return !host.directoryExists || host.directoryExists(directoryName);
+    }
+    ts.directoryProbablyExists = directoryProbablyExists;
+    function loadModuleFromFileNoPackageId(extensions, candidate, failedLookupLocations, onlyRecordFailures, state) {
+        return noPackageId(loadModuleFromFile(extensions, candidate, failedLookupLocations, onlyRecordFailures, state));
+    }
+    /**
+     * @param {boolean} onlyRecordFailures - if true then function won't try to actually load files but instead record all attempts as failures. This flag is necessary
+     * in cases when we know upfront that all load attempts will fail (because containing folder does not exists) however we still need to record all failed lookup locations.
+     */
+    function loadModuleFromFile(extensions, candidate, failedLookupLocations, onlyRecordFailures, state) {
+        if (extensions === Extensions.Json) {
+            var extensionLess = ts.tryRemoveExtension(candidate, ".json" /* Json */);
+            return extensionLess === undefined ? undefined : tryAddingExtensions(extensionLess, extensions, failedLookupLocations, onlyRecordFailures, state);
+        }
+        // First, try adding an extension. An import of "foo" could be matched by a file "foo.ts", or "foo.js" by "foo.js.ts"
+        var resolvedByAddingExtension = tryAddingExtensions(candidate, extensions, failedLookupLocations, onlyRecordFailures, state);
+        if (resolvedByAddingExtension) {
+            return resolvedByAddingExtension;
+        }
+        // If that didn't work, try stripping a ".js" or ".jsx" extension and replacing it with a TypeScript one;
+        // e.g. "./foo.js" can be matched by "./foo.ts" or "./foo.d.ts"
+        if (ts.hasJavaScriptFileExtension(candidate)) {
+            var extensionless = ts.removeFileExtension(candidate);
+            if (state.traceEnabled) {
+                var extension = candidate.substring(extensionless.length);
+                trace(state.host, ts.Diagnostics.File_name_0_has_a_1_extension_stripping_it, candidate, extension);
+            }
+            return tryAddingExtensions(extensionless, extensions, failedLookupLocations, onlyRecordFailures, state);
+        }
+    }
+    /** Try to return an existing file that adds one of the `extensions` to `candidate`. */
+    function tryAddingExtensions(candidate, extensions, failedLookupLocations, onlyRecordFailures, state) {
+        if (!onlyRecordFailures) {
+            // check if containing folder exists - if it doesn't then just record failures for all supported extensions without disk probing
+            var directory = ts.getDirectoryPath(candidate);
+            if (directory) {
+                onlyRecordFailures = !directoryProbablyExists(directory, state.host);
+            }
+        }
+        switch (extensions) {
+            case Extensions.DtsOnly:
+                return tryExtension(".d.ts" /* Dts */);
+            case Extensions.TypeScript:
+                return tryExtension(".ts" /* Ts */) || tryExtension(".tsx" /* Tsx */) || tryExtension(".d.ts" /* Dts */);
+            case Extensions.JavaScript:
+                return tryExtension(".js" /* Js */) || tryExtension(".jsx" /* Jsx */);
+            case Extensions.Json:
+                return tryExtension(".json" /* Json */);
+        }
+        function tryExtension(ext) {
+            var path = tryFile(candidate + ext, failedLookupLocations, onlyRecordFailures, state);
+            return path === undefined ? undefined : { path: path, ext: ext };
+        }
+    }
+    /** Return the file if it exists. */
+    function tryFile(fileName, failedLookupLocations, onlyRecordFailures, state) {
+        if (!onlyRecordFailures) {
+            if (state.host.fileExists(fileName)) {
+                if (state.traceEnabled) {
+                    trace(state.host, ts.Diagnostics.File_0_exist_use_it_as_a_name_resolution_result, fileName);
+                }
+                return fileName;
+            }
+            else {
+                if (state.traceEnabled) {
+                    trace(state.host, ts.Diagnostics.File_0_does_not_exist, fileName);
+                }
+            }
+        }
+        failedLookupLocations.push(fileName);
+        return undefined;
+    }
+    function loadNodeModuleFromDirectory(extensions, candidate, failedLookupLocations, onlyRecordFailures, state, considerPackageJson) {
+        if (considerPackageJson === void 0) { considerPackageJson = true; }
+        var _a = considerPackageJson
+            ? getPackageJsonInfo(candidate, "", failedLookupLocations, onlyRecordFailures, state)
+            : { packageJsonContent: undefined, packageId: undefined }, packageJsonContent = _a.packageJsonContent, packageId = _a.packageId;
+        return withPackageId(packageId, loadNodeModuleFromDirectoryWorker(extensions, candidate, failedLookupLocations, onlyRecordFailures, state, packageJsonContent));
+    }
+    function loadNodeModuleFromDirectoryWorker(extensions, candidate, failedLookupLocations, onlyRecordFailures, state, packageJsonContent) {
+        var fromPackageJson = packageJsonContent && loadModuleFromPackageJson(packageJsonContent, extensions, candidate, failedLookupLocations, state);
+        if (fromPackageJson) {
+            return fromPackageJson;
+        }
+        var directoryExists = !onlyRecordFailures && directoryProbablyExists(candidate, state.host);
+        return loadModuleFromFile(extensions, ts.combinePaths(candidate, "index"), failedLookupLocations, !directoryExists, state);
+    }
+    function getPackageJsonInfo(nodeModuleDirectory, subModuleName, failedLookupLocations, onlyRecordFailures, state) {
+        var host = state.host, traceEnabled = state.traceEnabled;
+        var directoryExists = !onlyRecordFailures && directoryProbablyExists(nodeModuleDirectory, host);
+        var packageJsonPath = pathToPackageJson(nodeModuleDirectory);
+        if (directoryExists && host.fileExists(packageJsonPath)) {
+            var packageJsonContent = readJson(packageJsonPath, host);
+            if (subModuleName === "") { // looking up the root - need to handle types/typings/main redirects for subModuleName
+                var path = tryReadPackageJsonFields(/*readTypes*/ true, packageJsonContent, nodeModuleDirectory, state);
+                if (typeof path === "string") {
+                    subModuleName = addExtensionAndIndex(path.substring(nodeModuleDirectory.length + 1));
+                }
+                else {
+                    var jsPath = tryReadPackageJsonFields(/*readTypes*/ false, packageJsonContent, nodeModuleDirectory, state);
+                    if (typeof jsPath === "string" && jsPath.length > nodeModuleDirectory.length) {
+                        var potentialSubModule_1 = jsPath.substring(nodeModuleDirectory.length + 1);
+                        subModuleName = (ts.forEach(ts.supportedJavascriptExtensions, function (extension) {
+                            return ts.tryRemoveExtension(potentialSubModule_1, extension);
+                        }) || potentialSubModule_1) + ".d.ts" /* Dts */;
+                    }
+                    else {
+                        subModuleName = "index.d.ts";
+                    }
+                }
+            }
+            if (!ts.endsWith(subModuleName, ".d.ts" /* Dts */)) {
+                subModuleName = addExtensionAndIndex(subModuleName);
+            }
+            var packageId = typeof packageJsonContent.name === "string" && typeof packageJsonContent.version === "string"
+                ? { name: packageJsonContent.name, subModuleName: subModuleName, version: packageJsonContent.version }
+                : undefined;
+            if (traceEnabled) {
+                if (packageId) {
+                    trace(host, ts.Diagnostics.Found_package_json_at_0_Package_ID_is_1, packageJsonPath, ts.packageIdToString(packageId));
+                }
+                else {
+                    trace(host, ts.Diagnostics.Found_package_json_at_0, packageJsonPath);
+                }
+            }
+            return { found: true, packageJsonContent: packageJsonContent, packageId: packageId };
+        }
+        else {
+            if (directoryExists && traceEnabled) {
+                trace(host, ts.Diagnostics.File_0_does_not_exist, packageJsonPath);
+            }
+            // record package json as one of failed lookup locations - in the future if this file will appear it will invalidate resolution results
+            failedLookupLocations.push(packageJsonPath);
+            return { found: false, packageJsonContent: undefined, packageId: undefined };
+        }
+    }
+    function loadModuleFromPackageJson(jsonContent, extensions, candidate, failedLookupLocations, state) {
+        var file = tryReadPackageJsonFields(extensions !== Extensions.JavaScript && extensions !== Extensions.Json, jsonContent, candidate, state);
+        if (!file) {
+            if (extensions === Extensions.TypeScript) {
+                // When resolving typescript modules, try resolving using main field as well
+                file = tryReadPackageJsonFields(/*readTypes*/ false, jsonContent, candidate, state);
+                if (!file) {
+                    return undefined;
+                }
+            }
+            else {
+                return undefined;
+            }
+        }
+        var onlyRecordFailures = !directoryProbablyExists(ts.getDirectoryPath(file), state.host);
+        var fromFile = tryFile(file, failedLookupLocations, onlyRecordFailures, state);
+        if (fromFile) {
+            var resolved = resolvedIfExtensionMatches(extensions, fromFile);
+            if (resolved) {
+                return resolved;
+            }
+            if (state.traceEnabled) {
+                trace(state.host, ts.Diagnostics.File_0_has_an_unsupported_extension_so_skipping_it, fromFile);
+            }
+        }
+        // Even if extensions is DtsOnly, we can still look up a .ts file as a result of package.json "types"
+        var nextExtensions = extensions === Extensions.DtsOnly ? Extensions.TypeScript : extensions;
+        // Don't do package.json lookup recursively, because Node.js' package lookup doesn't.
+        var result = nodeLoadModuleByRelativeName(nextExtensions, file, failedLookupLocations, onlyRecordFailures, state, /*considerPackageJson*/ false);
+        if (result) {
+            // It won't have a `packageId` set, because we disabled `considerPackageJson`.
+            ts.Debug.assert(result.packageId === undefined);
+            return { path: result.path, ext: result.extension };
+        }
+    }
+    /** Resolve from an arbitrarily specified file. Return `undefined` if it has an unsupported extension. */
+    function resolvedIfExtensionMatches(extensions, path) {
+        var ext = ts.tryGetExtensionFromPath(path);
+        return ext !== undefined && extensionIsOk(extensions, ext) ? { path: path, ext: ext } : undefined;
+    }
+    /** True if `extension` is one of the supported `extensions`. */
+    function extensionIsOk(extensions, extension) {
+        switch (extensions) {
+            case Extensions.JavaScript:
+                return extension === ".js" /* Js */ || extension === ".jsx" /* Jsx */;
+            case Extensions.Json:
+                return extension === ".json" /* Json */;
+            case Extensions.TypeScript:
+                return extension === ".ts" /* Ts */ || extension === ".tsx" /* Tsx */ || extension === ".d.ts" /* Dts */;
+            case Extensions.DtsOnly:
+                return extension === ".d.ts" /* Dts */;
+        }
+    }
+    function pathToPackageJson(directory) {
+        return ts.combinePaths(directory, "package.json");
+    }
+    function loadModuleFromNodeModulesFolder(extensions, moduleName, nodeModulesFolder, nodeModulesFolderExists, failedLookupLocations, state) {
+        var candidate = ts.normalizePath(ts.combinePaths(nodeModulesFolder, moduleName));
+        // First look for a nested package.json, as in `node_modules/foo/bar/package.json`.
+        var packageJsonContent;
+        var packageId;
+        var packageInfo = getPackageJsonInfo(candidate, "", failedLookupLocations, /*onlyRecordFailures*/ !nodeModulesFolderExists, state);
+        if (packageInfo.found) {
+            (packageJsonContent = packageInfo.packageJsonContent, packageId = packageInfo.packageId);
+        }
+        else {
+            var _a = getPackageName(moduleName), packageName = _a.packageName, rest = _a.rest;
+            if (rest !== "") { // If "rest" is empty, we just did this search above.
+                var packageRootPath = ts.combinePaths(nodeModulesFolder, packageName);
+                // Don't use a "types" or "main" from here because we're not loading the root, but a subdirectory -- just here for the packageId.
+                packageId = getPackageJsonInfo(packageRootPath, rest, failedLookupLocations, !nodeModulesFolderExists, state).packageId;
+            }
+        }
+        var pathAndExtension = loadModuleFromFile(extensions, candidate, failedLookupLocations, !nodeModulesFolderExists, state) ||
+            loadNodeModuleFromDirectoryWorker(extensions, candidate, failedLookupLocations, !nodeModulesFolderExists, state, packageJsonContent);
+        return withPackageId(packageId, pathAndExtension);
+    }
+    /* @internal */
+    function getPackageName(moduleName) {
+        var idx = moduleName.indexOf(ts.directorySeparator);
+        if (moduleName[0] === "@") {
+            idx = moduleName.indexOf(ts.directorySeparator, idx + 1);
+        }
+        return idx === -1 ? { packageName: moduleName, rest: "" } : { packageName: moduleName.slice(0, idx), rest: moduleName.slice(idx + 1) };
+    }
+    ts.getPackageName = getPackageName;
+    function loadModuleFromNodeModules(extensions, moduleName, directory, failedLookupLocations, state, cache) {
+        return loadModuleFromNodeModulesWorker(extensions, moduleName, directory, failedLookupLocations, state, /*typesOnly*/ false, cache);
+    }
+    function loadModuleFromNodeModulesAtTypes(moduleName, directory, failedLookupLocations, state) {
+        // Extensions parameter here doesn't actually matter, because typesOnly ensures we're just doing @types lookup, which is always DtsOnly.
+        return loadModuleFromNodeModulesWorker(Extensions.DtsOnly, moduleName, directory, failedLookupLocations, state, /*typesOnly*/ true, /*cache*/ undefined);
+    }
+    function loadModuleFromNodeModulesWorker(extensions, moduleName, directory, failedLookupLocations, state, typesOnly, cache) {
+        var perModuleNameCache = cache && cache.getOrCreateCacheForModuleName(moduleName);
+        return ts.forEachAncestorDirectory(ts.normalizeSlashes(directory), function (ancestorDirectory) {
+            if (ts.getBaseFileName(ancestorDirectory) !== "node_modules") {
+                var resolutionFromCache = tryFindNonRelativeModuleNameInCache(perModuleNameCache, moduleName, ancestorDirectory, state.traceEnabled, state.host, failedLookupLocations);
+                if (resolutionFromCache) {
+                    return resolutionFromCache;
+                }
+                return toSearchResult(loadModuleFromNodeModulesOneLevel(extensions, moduleName, ancestorDirectory, failedLookupLocations, state, typesOnly));
+            }
+        });
+    }
+    /** Load a module from a single node_modules directory, but not from any ancestors' node_modules directories. */
+    function loadModuleFromNodeModulesOneLevel(extensions, moduleName, directory, failedLookupLocations, state, typesOnly) {
+        if (typesOnly === void 0) { typesOnly = false; }
+        var nodeModulesFolder = ts.combinePaths(directory, "node_modules");
+        var nodeModulesFolderExists = directoryProbablyExists(nodeModulesFolder, state.host);
+        if (!nodeModulesFolderExists && state.traceEnabled) {
+            trace(state.host, ts.Diagnostics.Directory_0_does_not_exist_skipping_all_lookups_in_it, nodeModulesFolder);
+        }
+        var packageResult = typesOnly ? undefined : loadModuleFromNodeModulesFolder(extensions, moduleName, nodeModulesFolder, nodeModulesFolderExists, failedLookupLocations, state);
+        if (packageResult) {
+            return packageResult;
+        }
+        if (extensions !== Extensions.JavaScript && extensions !== Extensions.Json) {
+            var nodeModulesAtTypes_1 = ts.combinePaths(nodeModulesFolder, "@types");
+            var nodeModulesAtTypesExists = nodeModulesFolderExists;
+            if (nodeModulesFolderExists && !directoryProbablyExists(nodeModulesAtTypes_1, state.host)) {
+                if (state.traceEnabled) {
+                    trace(state.host, ts.Diagnostics.Directory_0_does_not_exist_skipping_all_lookups_in_it, nodeModulesAtTypes_1);
+                }
+                nodeModulesAtTypesExists = false;
+            }
+            return loadModuleFromNodeModulesFolder(Extensions.DtsOnly, mangleScopedPackage(moduleName, state), nodeModulesAtTypes_1, nodeModulesAtTypesExists, failedLookupLocations, state);
+        }
+    }
+    /** Double underscores are used in DefinitelyTyped to delimit scoped packages. */
+    var mangledScopedPackageSeparator = "__";
+    /** For a scoped package, we must look in `@types/foo__bar` instead of `@types/@foo/bar`. */
+    function mangleScopedPackage(packageName, state) {
+        var mangled = getMangledNameForScopedPackage(packageName);
+        if (state.traceEnabled && mangled !== packageName) {
+            trace(state.host, ts.Diagnostics.Scoped_package_detected_looking_in_0, mangled);
+        }
+        return mangled;
+    }
+    /* @internal */
+    function getTypesPackageName(packageName) {
+        return "@types/" + getMangledNameForScopedPackage(packageName);
+    }
+    ts.getTypesPackageName = getTypesPackageName;
+    /* @internal */
+    function getMangledNameForScopedPackage(packageName) {
+        if (ts.startsWith(packageName, "@")) {
+            var replaceSlash = packageName.replace(ts.directorySeparator, mangledScopedPackageSeparator);
+            if (replaceSlash !== packageName) {
+                return replaceSlash.slice(1); // Take off the "@"
+            }
+        }
+        return packageName;
+    }
+    ts.getMangledNameForScopedPackage = getMangledNameForScopedPackage;
+    /* @internal */
+    function getPackageNameFromAtTypesDirectory(mangledName) {
+        var withoutAtTypePrefix = ts.removePrefix(mangledName, "@types/");
+        if (withoutAtTypePrefix !== mangledName) {
+            return getUnmangledNameForScopedPackage(withoutAtTypePrefix);
+        }
+        return mangledName;
+    }
+    ts.getPackageNameFromAtTypesDirectory = getPackageNameFromAtTypesDirectory;
+    /* @internal */
+    function getUnmangledNameForScopedPackage(typesPackageName) {
+        return ts.stringContains(typesPackageName, mangledScopedPackageSeparator) ?
+            "@" + typesPackageName.replace(mangledScopedPackageSeparator, ts.directorySeparator) :
+            typesPackageName;
+    }
+    ts.getUnmangledNameForScopedPackage = getUnmangledNameForScopedPackage;
+    function tryFindNonRelativeModuleNameInCache(cache, moduleName, containingDirectory, traceEnabled, host, failedLookupLocations) {
+        var result = cache && cache.get(containingDirectory);
+        if (result) {
+            if (traceEnabled) {
+                trace(host, ts.Diagnostics.Resolution_for_module_0_was_found_in_cache_from_location_1, moduleName, containingDirectory);
+            }
+            failedLookupLocations.push.apply(failedLookupLocations, result.failedLookupLocations);
+            return { value: result.resolvedModule && { path: result.resolvedModule.resolvedFileName, extension: result.resolvedModule.extension, packageId: result.resolvedModule.packageId } };
+        }
+    }
+    function classicNameResolver(moduleName, containingFile, compilerOptions, host, cache) {
+        var traceEnabled = isTraceEnabled(compilerOptions, host);
+        var state = { compilerOptions: compilerOptions, host: host, traceEnabled: traceEnabled };
+        var failedLookupLocations = [];
+        var containingDirectory = ts.getDirectoryPath(containingFile);
+        var resolved = tryResolve(Extensions.TypeScript) || tryResolve(Extensions.JavaScript);
+        // No originalPath because classic resolution doesn't resolve realPath
+        return createResolvedModuleWithFailedLookupLocations(resolved && resolved.value, /*originalPath*/ undefined, /*isExternalLibraryImport*/ false, failedLookupLocations);
+        function tryResolve(extensions) {
+            var resolvedUsingSettings = tryLoadModuleUsingOptionalResolutionSettings(extensions, moduleName, containingDirectory, loadModuleFromFileNoPackageId, failedLookupLocations, state);
+            if (resolvedUsingSettings) {
+                return { value: resolvedUsingSettings };
+            }
+            var perModuleNameCache = cache && cache.getOrCreateCacheForModuleName(moduleName);
+            if (!ts.isExternalModuleNameRelative(moduleName)) {
+                // Climb up parent directories looking for a module.
+                var resolved_3 = ts.forEachAncestorDirectory(containingDirectory, function (directory) {
+                    var resolutionFromCache = tryFindNonRelativeModuleNameInCache(perModuleNameCache, moduleName, directory, traceEnabled, host, failedLookupLocations);
+                    if (resolutionFromCache) {
+                        return resolutionFromCache;
+                    }
+                    var searchName = ts.normalizePath(ts.combinePaths(directory, moduleName));
+                    return toSearchResult(loadModuleFromFileNoPackageId(extensions, searchName, failedLookupLocations, /*onlyRecordFailures*/ false, state));
+                });
+                if (resolved_3) {
+                    return resolved_3;
+                }
+                if (extensions === Extensions.TypeScript) {
+                    // If we didn't find the file normally, look it up in @types.
+                    return loadModuleFromNodeModulesAtTypes(moduleName, containingDirectory, failedLookupLocations, state);
+                }
+            }
+            else {
+                var candidate = ts.normalizePath(ts.combinePaths(containingDirectory, moduleName));
+                return toSearchResult(loadModuleFromFileNoPackageId(extensions, candidate, failedLookupLocations, /*onlyRecordFailures*/ false, state));
+            }
+        }
+    }
+    ts.classicNameResolver = classicNameResolver;
+    /**
+     * LSHost may load a module from a global cache of typings.
+     * This is the minumum code needed to expose that functionality; the rest is in LSHost.
+     */
+    /* @internal */
+    function loadModuleFromGlobalCache(moduleName, projectName, compilerOptions, host, globalCache) {
+        var traceEnabled = isTraceEnabled(compilerOptions, host);
+        if (traceEnabled) {
+            trace(host, ts.Diagnostics.Auto_discovery_for_typings_is_enabled_in_project_0_Running_extra_resolution_pass_for_module_1_using_cache_location_2, projectName, moduleName, globalCache);
+        }
+        var state = { compilerOptions: compilerOptions, host: host, traceEnabled: traceEnabled };
+        var failedLookupLocations = [];
+        var resolved = loadModuleFromNodeModulesOneLevel(Extensions.DtsOnly, moduleName, globalCache, failedLookupLocations, state);
+        return createResolvedModuleWithFailedLookupLocations(resolved, /*originalPath*/ undefined, /*isExternalLibraryImport*/ true, failedLookupLocations);
+    }
+    ts.loadModuleFromGlobalCache = loadModuleFromGlobalCache;
+    /**
+     * Wraps value to SearchResult.
+     * @returns undefined if value is undefined or { value } otherwise
+     */
+    function toSearchResult(value) {
+        return value !== undefined ? { value: value } : undefined;
+    }
+})(ts || (ts = {}));
+//# sourceMappingURL=parser.js.map
+"use strict";
+var __assign = (this && this.__assign) || Object.assign || function(t) {
+    for (var s, i = 1, n = arguments.length; i < n; i++) {
+        s = arguments[i];
+        for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
+            t[p] = s[p];
+    }
+    return t;
+};
+var __makeTemplateObject = (this && this.__makeTemplateObject) || function (cooked, raw) {
+    if (Object.defineProperty) { Object.defineProperty(cooked, "raw", { value: raw }); } else { cooked.raw = raw; }
+    return cooked;
+};
 /* @internal */
 var ts;
 (function (ts) {
@@ -22025,7 +25554,7 @@ var ts;
             if (symbolFlags & 67216319 /* Value */) {
                 var valueDeclaration = symbol.valueDeclaration;
                 if (!valueDeclaration ||
-                    (valueDeclaration.kind !== node.kind && valueDeclaration.kind === 239 /* ModuleDeclaration */)) {
+                    (valueDeclaration.kind !== node.kind && ts.isEffectiveModuleDeclaration(valueDeclaration))) {
                     // other kinds of value declarations take precedence over modules
                     symbol.valueDeclaration = node;
                 }
@@ -22379,8 +25908,8 @@ var ts;
                 var savedSubtreeTransformFlags = subtreeTransformFlags;
                 subtreeTransformFlags = 0 /* None */;
                 var nodeArrayFlags = 0 /* None */;
-                for (var _i = 0, nodes_2 = nodes; _i < nodes_2.length; _i++) {
-                    var node = nodes_2[_i];
+                for (var _i = 0, nodes_1 = nodes; _i < nodes_1.length; _i++) {
+                    var node = nodes_1[_i];
                     bindFunction(node);
                     nodeArrayFlags |= node.transformFlags & ~536870912 /* HasComputedFlags */;
                 }
@@ -25405,1126 +28934,6 @@ var ts;
     }
     ts.createGetSymbolWalker = createGetSymbolWalker;
 })(ts || (ts = {}));
-var ts;
-(function (ts) {
-    function trace(host) {
-        host.trace(ts.formatMessage.apply(undefined, arguments));
-    }
-    ts.trace = trace;
-    /* @internal */
-    function isTraceEnabled(compilerOptions, host) {
-        return !!compilerOptions.traceResolution && host.trace !== undefined;
-    }
-    ts.isTraceEnabled = isTraceEnabled;
-    function withPackageId(packageId, r) {
-        return r && { path: r.path, extension: r.ext, packageId: packageId };
-    }
-    function noPackageId(r) {
-        return withPackageId(/*packageId*/ undefined, r);
-    }
-    /**
-     * Kinds of file that we are currently looking for.
-     * Typically there is one pass with Extensions.TypeScript, then a second pass with Extensions.JavaScript.
-     */
-    var Extensions;
-    (function (Extensions) {
-        Extensions[Extensions["TypeScript"] = 0] = "TypeScript";
-        Extensions[Extensions["JavaScript"] = 1] = "JavaScript";
-        Extensions[Extensions["Json"] = 2] = "Json";
-        Extensions[Extensions["DtsOnly"] = 3] = "DtsOnly"; /** Only '.d.ts' */
-    })(Extensions || (Extensions = {}));
-    /** Used with `Extensions.DtsOnly` to extract the path from TypeScript results. */
-    function resolvedTypeScriptOnly(resolved) {
-        if (!resolved) {
-            return undefined;
-        }
-        ts.Debug.assert(ts.extensionIsTypeScript(resolved.extension));
-        return { fileName: resolved.path, packageId: resolved.packageId };
-    }
-    function createResolvedModuleWithFailedLookupLocations(resolved, originalPath, isExternalLibraryImport, failedLookupLocations) {
-        return {
-            resolvedModule: resolved && { resolvedFileName: resolved.path, originalPath: originalPath, extension: resolved.extension, isExternalLibraryImport: isExternalLibraryImport, packageId: resolved.packageId },
-            failedLookupLocations: failedLookupLocations
-        };
-    }
-    /** Reads from "main" or "types"/"typings" depending on `extensions`. */
-    function tryReadPackageJsonFields(readTypes, jsonContent, baseDirectory, state) {
-        return readTypes ? tryReadFromField("typings") || tryReadFromField("types") : tryReadFromField("main");
-        function tryReadFromField(fieldName) {
-            if (!ts.hasProperty(jsonContent, fieldName)) {
-                if (state.traceEnabled) {
-                    trace(state.host, ts.Diagnostics.package_json_does_not_have_a_0_field, fieldName);
-                }
-                return;
-            }
-            var fileName = jsonContent[fieldName];
-            if (!ts.isString(fileName)) {
-                if (state.traceEnabled) {
-                    trace(state.host, ts.Diagnostics.Expected_type_of_0_field_in_package_json_to_be_string_got_1, fieldName, typeof fileName);
-                }
-                return;
-            }
-            var path = ts.normalizePath(ts.combinePaths(baseDirectory, fileName));
-            if (state.traceEnabled) {
-                trace(state.host, ts.Diagnostics.package_json_has_0_field_1_that_references_2, fieldName, fileName, path);
-            }
-            return path;
-        }
-    }
-    /* @internal */
-    function readJson(path, host) {
-        try {
-            var jsonText = host.readFile(path);
-            if (!jsonText)
-                return {};
-            var result = ts.parseConfigFileTextToJson(path, jsonText);
-            if (result.error) {
-                return {};
-            }
-            return result.config;
-        }
-        catch (e) {
-            // gracefully handle if readFile fails or returns not JSON
-            return {};
-        }
-    }
-    ts.readJson = readJson;
-    function getEffectiveTypeRoots(options, host) {
-        if (options.typeRoots) {
-            return options.typeRoots;
-        }
-        var currentDirectory;
-        if (options.configFilePath) {
-            currentDirectory = ts.getDirectoryPath(options.configFilePath);
-        }
-        else if (host.getCurrentDirectory) {
-            currentDirectory = host.getCurrentDirectory();
-        }
-        if (currentDirectory !== undefined) {
-            return getDefaultTypeRoots(currentDirectory, host);
-        }
-    }
-    ts.getEffectiveTypeRoots = getEffectiveTypeRoots;
-    /**
-     * Returns the path to every node_modules/@types directory from some ancestor directory.
-     * Returns undefined if there are none.
-     */
-    function getDefaultTypeRoots(currentDirectory, host) {
-        if (!host.directoryExists) {
-            return [ts.combinePaths(currentDirectory, nodeModulesAtTypes)];
-            // And if it doesn't exist, tough.
-        }
-        var typeRoots;
-        ts.forEachAncestorDirectory(ts.normalizePath(currentDirectory), function (directory) {
-            var atTypes = ts.combinePaths(directory, nodeModulesAtTypes);
-            if (host.directoryExists(atTypes)) {
-                (typeRoots || (typeRoots = [])).push(atTypes);
-            }
-            return undefined;
-        });
-        return typeRoots;
-    }
-    var nodeModulesAtTypes = ts.combinePaths("node_modules", "@types");
-    /**
-     * @param {string | undefined} containingFile - file that contains type reference directive, can be undefined if containing file is unknown.
-     * This is possible in case if resolution is performed for directives specified via 'types' parameter. In this case initial path for secondary lookups
-     * is assumed to be the same as root directory of the project.
-     */
-    function resolveTypeReferenceDirective(typeReferenceDirectiveName, containingFile, options, host) {
-        var traceEnabled = isTraceEnabled(options, host);
-        var moduleResolutionState = { compilerOptions: options, host: host, traceEnabled: traceEnabled };
-        var typeRoots = getEffectiveTypeRoots(options, host);
-        if (traceEnabled) {
-            if (containingFile === undefined) {
-                if (typeRoots === undefined) {
-                    trace(host, ts.Diagnostics.Resolving_type_reference_directive_0_containing_file_not_set_root_directory_not_set, typeReferenceDirectiveName);
-                }
-                else {
-                    trace(host, ts.Diagnostics.Resolving_type_reference_directive_0_containing_file_not_set_root_directory_1, typeReferenceDirectiveName, typeRoots);
-                }
-            }
-            else {
-                if (typeRoots === undefined) {
-                    trace(host, ts.Diagnostics.Resolving_type_reference_directive_0_containing_file_1_root_directory_not_set, typeReferenceDirectiveName, containingFile);
-                }
-                else {
-                    trace(host, ts.Diagnostics.Resolving_type_reference_directive_0_containing_file_1_root_directory_2, typeReferenceDirectiveName, containingFile, typeRoots);
-                }
-            }
-        }
-        var failedLookupLocations = [];
-        var resolved = primaryLookup();
-        var primary = true;
-        if (!resolved) {
-            resolved = secondaryLookup();
-            primary = false;
-        }
-        var resolvedTypeReferenceDirective;
-        if (resolved) {
-            if (!options.preserveSymlinks) {
-                resolved = __assign({}, resolved, { fileName: realPath(resolved.fileName, host, traceEnabled) });
-            }
-            if (traceEnabled) {
-                trace(host, ts.Diagnostics.Type_reference_directive_0_was_successfully_resolved_to_1_primary_Colon_2, typeReferenceDirectiveName, resolved.fileName, primary);
-            }
-            resolvedTypeReferenceDirective = { primary: primary, resolvedFileName: resolved.fileName, packageId: resolved.packageId };
-        }
-        return { resolvedTypeReferenceDirective: resolvedTypeReferenceDirective, failedLookupLocations: failedLookupLocations };
-        function primaryLookup() {
-            // Check primary library paths
-            if (typeRoots && typeRoots.length) {
-                if (traceEnabled) {
-                    trace(host, ts.Diagnostics.Resolving_with_primary_search_path_0, typeRoots.join(", "));
-                }
-                return ts.forEach(typeRoots, function (typeRoot) {
-                    var candidate = ts.combinePaths(typeRoot, typeReferenceDirectiveName);
-                    var candidateDirectory = ts.getDirectoryPath(candidate);
-                    var directoryExists = directoryProbablyExists(candidateDirectory, host);
-                    if (!directoryExists && traceEnabled) {
-                        trace(host, ts.Diagnostics.Directory_0_does_not_exist_skipping_all_lookups_in_it, candidateDirectory);
-                    }
-                    return resolvedTypeScriptOnly(loadNodeModuleFromDirectory(Extensions.DtsOnly, candidate, failedLookupLocations, !directoryExists, moduleResolutionState));
-                });
-            }
-            else {
-                if (traceEnabled) {
-                    trace(host, ts.Diagnostics.Root_directory_cannot_be_determined_skipping_primary_search_paths);
-                }
-            }
-        }
-        function secondaryLookup() {
-            var initialLocationForSecondaryLookup = containingFile && ts.getDirectoryPath(containingFile);
-            if (initialLocationForSecondaryLookup !== undefined) {
-                // check secondary locations
-                if (traceEnabled) {
-                    trace(host, ts.Diagnostics.Looking_up_in_node_modules_folder_initial_location_0, initialLocationForSecondaryLookup);
-                }
-                var result = loadModuleFromNodeModules(Extensions.DtsOnly, typeReferenceDirectiveName, initialLocationForSecondaryLookup, failedLookupLocations, moduleResolutionState, /*cache*/ undefined);
-                var resolvedFile = resolvedTypeScriptOnly(result && result.value);
-                if (!resolvedFile && traceEnabled) {
-                    trace(host, ts.Diagnostics.Type_reference_directive_0_was_not_resolved, typeReferenceDirectiveName);
-                }
-                return resolvedFile;
-            }
-            else {
-                if (traceEnabled) {
-                    trace(host, ts.Diagnostics.Containing_file_is_not_specified_and_root_directory_cannot_be_determined_skipping_lookup_in_node_modules_folder);
-                }
-            }
-        }
-    }
-    ts.resolveTypeReferenceDirective = resolveTypeReferenceDirective;
-    /**
-     * Given a set of options, returns the set of type directive names
-     *   that should be included for this program automatically.
-     * This list could either come from the config file,
-     *   or from enumerating the types root + initial secondary types lookup location.
-     * More type directives might appear in the program later as a result of loading actual source files;
-     *   this list is only the set of defaults that are implicitly included.
-     */
-    function getAutomaticTypeDirectiveNames(options, host) {
-        // Use explicit type list from tsconfig.json
-        if (options.types) {
-            return options.types;
-        }
-        // Walk the primary type lookup locations
-        var result = [];
-        if (host.directoryExists && host.getDirectories) {
-            var typeRoots = getEffectiveTypeRoots(options, host);
-            if (typeRoots) {
-                for (var _i = 0, typeRoots_1 = typeRoots; _i < typeRoots_1.length; _i++) {
-                    var root = typeRoots_1[_i];
-                    if (host.directoryExists(root)) {
-                        for (var _a = 0, _b = host.getDirectories(root); _a < _b.length; _a++) {
-                            var typeDirectivePath = _b[_a];
-                            var normalized = ts.normalizePath(typeDirectivePath);
-                            var packageJsonPath = pathToPackageJson(ts.combinePaths(root, normalized));
-                            // `types-publisher` sometimes creates packages with `"typings": null` for packages that don't provide their own types.
-                            // See `createNotNeededPackageJSON` in the types-publisher` repo.
-                            // tslint:disable-next-line:no-null-keyword
-                            var isNotNeededPackage = host.fileExists(packageJsonPath) && readJson(packageJsonPath, host).typings === null;
-                            if (!isNotNeededPackage) {
-                                // Return just the type directive names
-                                result.push(ts.getBaseFileName(normalized));
-                            }
-                        }
-                    }
-                }
-            }
-        }
-        return result;
-    }
-    ts.getAutomaticTypeDirectiveNames = getAutomaticTypeDirectiveNames;
-    function createModuleResolutionCache(currentDirectory, getCanonicalFileName) {
-        return createModuleResolutionCacheWithMaps(ts.createMap(), ts.createMap(), currentDirectory, getCanonicalFileName);
-    }
-    ts.createModuleResolutionCache = createModuleResolutionCache;
-    /*@internal*/
-    function createModuleResolutionCacheWithMaps(directoryToModuleNameMap, moduleNameToDirectoryMap, currentDirectory, getCanonicalFileName) {
-        return { getOrCreateCacheForDirectory: getOrCreateCacheForDirectory, getOrCreateCacheForModuleName: getOrCreateCacheForModuleName };
-        function getOrCreateCacheForDirectory(directoryName) {
-            var path = ts.toPath(directoryName, currentDirectory, getCanonicalFileName);
-            var perFolderCache = directoryToModuleNameMap.get(path);
-            if (!perFolderCache) {
-                perFolderCache = ts.createMap();
-                directoryToModuleNameMap.set(path, perFolderCache);
-            }
-            return perFolderCache;
-        }
-        function getOrCreateCacheForModuleName(nonRelativeModuleName) {
-            if (ts.isExternalModuleNameRelative(nonRelativeModuleName)) {
-                return undefined; // TODO: GH#18217
-            }
-            var perModuleNameCache = moduleNameToDirectoryMap.get(nonRelativeModuleName);
-            if (!perModuleNameCache) {
-                perModuleNameCache = createPerModuleNameCache();
-                moduleNameToDirectoryMap.set(nonRelativeModuleName, perModuleNameCache);
-            }
-            return perModuleNameCache;
-        }
-        function createPerModuleNameCache() {
-            var directoryPathMap = ts.createMap();
-            return { get: get, set: set };
-            function get(directory) {
-                return directoryPathMap.get(ts.toPath(directory, currentDirectory, getCanonicalFileName));
-            }
-            /**
-             * At first this function add entry directory -> module resolution result to the table.
-             * Then it computes the set of parent folders for 'directory' that should have the same module resolution result
-             * and for every parent folder in set it adds entry: parent -> module resolution. .
-             * Lets say we first directory name: /a/b/c/d/e and resolution result is: /a/b/bar.ts.
-             * Set of parent folders that should have the same result will be:
-             * [
-             *     /a/b/c/d, /a/b/c, /a/b
-             * ]
-             * this means that request for module resolution from file in any of these folder will be immediately found in cache.
-             */
-            function set(directory, result) {
-                var path = ts.toPath(directory, currentDirectory, getCanonicalFileName);
-                // if entry is already in cache do nothing
-                if (directoryPathMap.has(path)) {
-                    return;
-                }
-                directoryPathMap.set(path, result);
-                var resolvedFileName = result.resolvedModule && result.resolvedModule.resolvedFileName;
-                // find common prefix between directory and resolved file name
-                // this common prefix should be the shorted path that has the same resolution
-                // directory: /a/b/c/d/e
-                // resolvedFileName: /a/b/foo.d.ts
-                var commonPrefix = getCommonPrefix(path, resolvedFileName);
-                var current = path;
-                while (true) {
-                    var parent = ts.getDirectoryPath(current);
-                    if (parent === current || directoryPathMap.has(parent)) {
-                        break;
-                    }
-                    directoryPathMap.set(parent, result);
-                    current = parent;
-                    if (current === commonPrefix) {
-                        break;
-                    }
-                }
-            }
-            function getCommonPrefix(directory, resolution) {
-                if (resolution === undefined) {
-                    return undefined;
-                }
-                var resolutionDirectory = ts.toPath(ts.getDirectoryPath(resolution), currentDirectory, getCanonicalFileName);
-                // find first position where directory and resolution differs
-                var i = 0;
-                while (i < Math.min(directory.length, resolutionDirectory.length) && directory.charCodeAt(i) === resolutionDirectory.charCodeAt(i)) {
-                    i++;
-                }
-                // find last directory separator before position i
-                var sep = directory.lastIndexOf(ts.directorySeparator, i);
-                if (sep < 0) {
-                    return undefined;
-                }
-                return directory.substr(0, sep);
-            }
-        }
-    }
-    ts.createModuleResolutionCacheWithMaps = createModuleResolutionCacheWithMaps;
-    function resolveModuleNameFromCache(moduleName, containingFile, cache) {
-        var containingDirectory = ts.getDirectoryPath(containingFile);
-        var perFolderCache = cache && cache.getOrCreateCacheForDirectory(containingDirectory);
-        return perFolderCache && perFolderCache.get(moduleName);
-    }
-    ts.resolveModuleNameFromCache = resolveModuleNameFromCache;
-    function resolveModuleName(moduleName, containingFile, compilerOptions, host, cache) {
-        var traceEnabled = isTraceEnabled(compilerOptions, host);
-        if (traceEnabled) {
-            trace(host, ts.Diagnostics.Resolving_module_0_from_1, moduleName, containingFile);
-        }
-        var containingDirectory = ts.getDirectoryPath(containingFile);
-        var perFolderCache = cache && cache.getOrCreateCacheForDirectory(containingDirectory);
-        var result = perFolderCache && perFolderCache.get(moduleName);
-        if (result) {
-            if (traceEnabled) {
-                trace(host, ts.Diagnostics.Resolution_for_module_0_was_found_in_cache_from_location_1, moduleName, containingDirectory);
-            }
-        }
-        else {
-            var moduleResolution = compilerOptions.moduleResolution;
-            if (moduleResolution === undefined) {
-                moduleResolution = ts.getEmitModuleKind(compilerOptions) === ts.ModuleKind.CommonJS ? ts.ModuleResolutionKind.NodeJs : ts.ModuleResolutionKind.Classic;
-                if (traceEnabled) {
-                    trace(host, ts.Diagnostics.Module_resolution_kind_is_not_specified_using_0, ts.ModuleResolutionKind[moduleResolution]);
-                }
-            }
-            else {
-                if (traceEnabled) {
-                    trace(host, ts.Diagnostics.Explicitly_specified_module_resolution_kind_Colon_0, ts.ModuleResolutionKind[moduleResolution]);
-                }
-            }
-            switch (moduleResolution) {
-                case ts.ModuleResolutionKind.NodeJs:
-                    result = nodeModuleNameResolver(moduleName, containingFile, compilerOptions, host, cache);
-                    break;
-                case ts.ModuleResolutionKind.Classic:
-                    result = classicNameResolver(moduleName, containingFile, compilerOptions, host, cache);
-                    break;
-                default:
-                    return ts.Debug.fail("Unexpected moduleResolution: " + moduleResolution);
-            }
-            if (perFolderCache) {
-                perFolderCache.set(moduleName, result);
-                // put result in per-module name cache
-                var perModuleNameCache = cache.getOrCreateCacheForModuleName(moduleName);
-                if (perModuleNameCache) {
-                    perModuleNameCache.set(containingDirectory, result);
-                }
-            }
-        }
-        if (traceEnabled) {
-            if (result.resolvedModule) {
-                trace(host, ts.Diagnostics.Module_name_0_was_successfully_resolved_to_1, moduleName, result.resolvedModule.resolvedFileName);
-            }
-            else {
-                trace(host, ts.Diagnostics.Module_name_0_was_not_resolved, moduleName);
-            }
-        }
-        return result;
-    }
-    ts.resolveModuleName = resolveModuleName;
-    /**
-     * Any module resolution kind can be augmented with optional settings: 'baseUrl', 'paths' and 'rootDirs' - they are used to
-     * mitigate differences between design time structure of the project and its runtime counterpart so the same import name
-     * can be resolved successfully by TypeScript compiler and runtime module loader.
-     * If these settings are set then loading procedure will try to use them to resolve module name and it can of failure it will
-     * fallback to standard resolution routine.
-     *
-     * - baseUrl - this setting controls how non-relative module names are resolved. If this setting is specified then non-relative
-     * names will be resolved relative to baseUrl: i.e. if baseUrl is '/a/b' then candidate location to resolve module name 'c/d' will
-     * be '/a/b/c/d'
-     * - paths - this setting can only be used when baseUrl is specified. allows to tune how non-relative module names
-     * will be resolved based on the content of the module name.
-     * Structure of 'paths' compiler options
-     * 'paths': {
-     *    pattern-1: [...substitutions],
-     *    pattern-2: [...substitutions],
-     *    ...
-     *    pattern-n: [...substitutions]
-     * }
-     * Pattern here is a string that can contain zero or one '*' character. During module resolution module name will be matched against
-     * all patterns in the list. Matching for patterns that don't contain '*' means that module name must be equal to pattern respecting the case.
-     * If pattern contains '*' then to match pattern "<prefix>*<suffix>" module name must start with the <prefix> and end with <suffix>.
-     * <MatchedStar> denotes part of the module name between <prefix> and <suffix>.
-     * If module name can be matches with multiple patterns then pattern with the longest prefix will be picked.
-     * After selecting pattern we'll use list of substitutions to get candidate locations of the module and the try to load module
-     * from the candidate location.
-     * Substitution is a string that can contain zero or one '*'. To get candidate location from substitution we'll pick every
-     * substitution in the list and replace '*' with <MatchedStar> string. If candidate location is not rooted it
-     * will be converted to absolute using baseUrl.
-     * For example:
-     * baseUrl: /a/b/c
-     * "paths": {
-     *     // match all module names
-     *     "*": [
-     *         "*",        // use matched name as is,
-     *                     // <matched name> will be looked as /a/b/c/<matched name>
-     *
-     *         "folder1/*" // substitution will convert matched name to 'folder1/<matched name>',
-     *                     // since it is not rooted then final candidate location will be /a/b/c/folder1/<matched name>
-     *     ],
-     *     // match module names that start with 'components/'
-     *     "components/*": [ "/root/components/*" ] // substitution will convert /components/folder1/<matched name> to '/root/components/folder1/<matched name>',
-     *                                              // it is rooted so it will be final candidate location
-     * }
-     *
-     * 'rootDirs' allows the project to be spreaded across multiple locations and resolve modules with relative names as if
-     * they were in the same location. For example lets say there are two files
-     * '/local/src/content/file1.ts'
-     * '/shared/components/contracts/src/content/protocols/file2.ts'
-     * After bundling content of '/shared/components/contracts/src' will be merged with '/local/src' so
-     * if file1 has the following import 'import {x} from "./protocols/file2"' it will be resolved successfully in runtime.
-     * 'rootDirs' provides the way to tell compiler that in order to get the whole project it should behave as if content of all
-     * root dirs were merged together.
-     * I.e. for the example above 'rootDirs' will have two entries: [ '/local/src', '/shared/components/contracts/src' ].
-     * Compiler will first convert './protocols/file2' into absolute path relative to the location of containing file:
-     * '/local/src/content/protocols/file2' and try to load it - failure.
-     * Then it will search 'rootDirs' looking for a longest matching prefix of this absolute path and if such prefix is found - absolute path will
-     * be converted to a path relative to found rootDir entry './content/protocols/file2' (*). As a last step compiler will check all remaining
-     * entries in 'rootDirs', use them to build absolute path out of (*) and try to resolve module from this location.
-     */
-    function tryLoadModuleUsingOptionalResolutionSettings(extensions, moduleName, containingDirectory, loader, failedLookupLocations, state) {
-        if (!ts.isExternalModuleNameRelative(moduleName)) {
-            return tryLoadModuleUsingBaseUrl(extensions, moduleName, loader, failedLookupLocations, state);
-        }
-        else {
-            return tryLoadModuleUsingRootDirs(extensions, moduleName, containingDirectory, loader, failedLookupLocations, state);
-        }
-    }
-    function tryLoadModuleUsingRootDirs(extensions, moduleName, containingDirectory, loader, failedLookupLocations, state) {
-        if (!state.compilerOptions.rootDirs) {
-            return undefined;
-        }
-        if (state.traceEnabled) {
-            trace(state.host, ts.Diagnostics.rootDirs_option_is_set_using_it_to_resolve_relative_module_name_0, moduleName);
-        }
-        var candidate = ts.normalizePath(ts.combinePaths(containingDirectory, moduleName));
-        var matchedRootDir;
-        var matchedNormalizedPrefix;
-        for (var _i = 0, _a = state.compilerOptions.rootDirs; _i < _a.length; _i++) {
-            var rootDir = _a[_i];
-            // rootDirs are expected to be absolute
-            // in case of tsconfig.json this will happen automatically - compiler will expand relative names
-            // using location of tsconfig.json as base location
-            var normalizedRoot = ts.normalizePath(rootDir);
-            if (!ts.endsWith(normalizedRoot, ts.directorySeparator)) {
-                normalizedRoot += ts.directorySeparator;
-            }
-            var isLongestMatchingPrefix = ts.startsWith(candidate, normalizedRoot) &&
-                (matchedNormalizedPrefix === undefined || matchedNormalizedPrefix.length < normalizedRoot.length);
-            if (state.traceEnabled) {
-                trace(state.host, ts.Diagnostics.Checking_if_0_is_the_longest_matching_prefix_for_1_2, normalizedRoot, candidate, isLongestMatchingPrefix);
-            }
-            if (isLongestMatchingPrefix) {
-                matchedNormalizedPrefix = normalizedRoot;
-                matchedRootDir = rootDir;
-            }
-        }
-        if (matchedNormalizedPrefix) {
-            if (state.traceEnabled) {
-                trace(state.host, ts.Diagnostics.Longest_matching_prefix_for_0_is_1, candidate, matchedNormalizedPrefix);
-            }
-            var suffix = candidate.substr(matchedNormalizedPrefix.length);
-            // first - try to load from a initial location
-            if (state.traceEnabled) {
-                trace(state.host, ts.Diagnostics.Loading_0_from_the_root_dir_1_candidate_location_2, suffix, matchedNormalizedPrefix, candidate);
-            }
-            var resolvedFileName = loader(extensions, candidate, failedLookupLocations, !directoryProbablyExists(containingDirectory, state.host), state);
-            if (resolvedFileName) {
-                return resolvedFileName;
-            }
-            if (state.traceEnabled) {
-                trace(state.host, ts.Diagnostics.Trying_other_entries_in_rootDirs);
-            }
-            // then try to resolve using remaining entries in rootDirs
-            for (var _b = 0, _c = state.compilerOptions.rootDirs; _b < _c.length; _b++) {
-                var rootDir = _c[_b];
-                if (rootDir === matchedRootDir) {
-                    // skip the initially matched entry
-                    continue;
-                }
-                var candidate_1 = ts.combinePaths(ts.normalizePath(rootDir), suffix);
-                if (state.traceEnabled) {
-                    trace(state.host, ts.Diagnostics.Loading_0_from_the_root_dir_1_candidate_location_2, suffix, rootDir, candidate_1);
-                }
-                var baseDirectory = ts.getDirectoryPath(candidate_1);
-                var resolvedFileName_1 = loader(extensions, candidate_1, failedLookupLocations, !directoryProbablyExists(baseDirectory, state.host), state);
-                if (resolvedFileName_1) {
-                    return resolvedFileName_1;
-                }
-            }
-            if (state.traceEnabled) {
-                trace(state.host, ts.Diagnostics.Module_resolution_using_rootDirs_has_failed);
-            }
-        }
-        return undefined;
-    }
-    function tryLoadModuleUsingBaseUrl(extensions, moduleName, loader, failedLookupLocations, state) {
-        if (!state.compilerOptions.baseUrl) {
-            return undefined;
-        }
-        if (state.traceEnabled) {
-            trace(state.host, ts.Diagnostics.baseUrl_option_is_set_to_0_using_this_value_to_resolve_non_relative_module_name_1, state.compilerOptions.baseUrl, moduleName);
-        }
-        // string is for exact match
-        var matchedPattern;
-        if (state.compilerOptions.paths) {
-            if (state.traceEnabled) {
-                trace(state.host, ts.Diagnostics.paths_option_is_specified_looking_for_a_pattern_to_match_module_name_0, moduleName);
-            }
-            matchedPattern = ts.matchPatternOrExact(ts.getOwnKeys(state.compilerOptions.paths), moduleName);
-        }
-        if (matchedPattern) {
-            var matchedStar_1 = ts.isString(matchedPattern) ? undefined : ts.matchedText(matchedPattern, moduleName);
-            var matchedPatternText = ts.isString(matchedPattern) ? matchedPattern : ts.patternText(matchedPattern);
-            if (state.traceEnabled) {
-                trace(state.host, ts.Diagnostics.Module_name_0_matched_pattern_1, moduleName, matchedPatternText);
-            }
-            return ts.forEach(state.compilerOptions.paths[matchedPatternText], function (subst) {
-                var path = matchedStar_1 ? subst.replace("*", matchedStar_1) : subst;
-                var candidate = ts.normalizePath(ts.combinePaths(state.compilerOptions.baseUrl, path));
-                if (state.traceEnabled) {
-                    trace(state.host, ts.Diagnostics.Trying_substitution_0_candidate_module_location_Colon_1, subst, path);
-                }
-                // A path mapping may have an extension, in contrast to an import, which should omit it.
-                var extension = ts.tryGetExtensionFromPath(candidate);
-                if (extension !== undefined) {
-                    var path_1 = tryFile(candidate, failedLookupLocations, /*onlyRecordFailures*/ false, state);
-                    if (path_1 !== undefined) {
-                        return noPackageId({ path: path_1, ext: extension });
-                    }
-                }
-                return loader(extensions, candidate, failedLookupLocations, !directoryProbablyExists(ts.getDirectoryPath(candidate), state.host), state);
-            });
-        }
-        else {
-            var candidate = ts.normalizePath(ts.combinePaths(state.compilerOptions.baseUrl, moduleName));
-            if (state.traceEnabled) {
-                trace(state.host, ts.Diagnostics.Resolving_module_name_0_relative_to_base_url_1_2, moduleName, state.compilerOptions.baseUrl, candidate);
-            }
-            return loader(extensions, candidate, failedLookupLocations, !directoryProbablyExists(ts.getDirectoryPath(candidate), state.host), state);
-        }
-    }
-    function nodeModuleNameResolver(moduleName, containingFile, compilerOptions, host, cache) {
-        return nodeModuleNameResolverWorker(moduleName, ts.getDirectoryPath(containingFile), compilerOptions, host, cache, /*jsOnly*/ false);
-    }
-    ts.nodeModuleNameResolver = nodeModuleNameResolver;
-    /**
-     * Expose resolution logic to allow us to use Node module resolution logic from arbitrary locations.
-     * No way to do this with `require()`: https://github.com/nodejs/node/issues/5963
-     * Throws an error if the module can't be resolved.
-     */
-    /* @internal */
-    function resolveJavaScriptModule(moduleName, initialDir, host) {
-        var _a = nodeModuleNameResolverWorker(moduleName, initialDir, { moduleResolution: ts.ModuleResolutionKind.NodeJs, allowJs: true }, host, /*cache*/ undefined, /*jsOnly*/ true), resolvedModule = _a.resolvedModule, failedLookupLocations = _a.failedLookupLocations;
-        if (!resolvedModule) {
-            throw new Error("Could not resolve JS module '" + moduleName + "' starting at '" + initialDir + "'. Looked in: " + failedLookupLocations.join(", "));
-        }
-        return resolvedModule.resolvedFileName;
-    }
-    ts.resolveJavaScriptModule = resolveJavaScriptModule;
-    function nodeModuleNameResolverWorker(moduleName, containingDirectory, compilerOptions, host, cache, jsOnly) {
-        var traceEnabled = isTraceEnabled(compilerOptions, host);
-        var failedLookupLocations = [];
-        var state = { compilerOptions: compilerOptions, host: host, traceEnabled: traceEnabled };
-        var result = jsOnly ?
-            tryResolve(Extensions.JavaScript) :
-            (tryResolve(Extensions.TypeScript) ||
-                tryResolve(Extensions.JavaScript) ||
-                (compilerOptions.resolveJsonModule ? tryResolve(Extensions.Json) : undefined));
-        if (result && result.value) {
-            var _a = result.value, resolved = _a.resolved, originalPath = _a.originalPath, isExternalLibraryImport = _a.isExternalLibraryImport;
-            return createResolvedModuleWithFailedLookupLocations(resolved, originalPath, isExternalLibraryImport, failedLookupLocations);
-        }
-        return { resolvedModule: undefined, failedLookupLocations: failedLookupLocations };
-        function tryResolve(extensions) {
-            var loader = function (extensions, candidate, failedLookupLocations, onlyRecordFailures, state) { return nodeLoadModuleByRelativeName(extensions, candidate, failedLookupLocations, onlyRecordFailures, state, /*considerPackageJson*/ true); };
-            var resolved = tryLoadModuleUsingOptionalResolutionSettings(extensions, moduleName, containingDirectory, loader, failedLookupLocations, state);
-            if (resolved) {
-                return toSearchResult({ resolved: resolved, isExternalLibraryImport: false });
-            }
-            if (!ts.isExternalModuleNameRelative(moduleName)) {
-                if (traceEnabled) {
-                    trace(host, ts.Diagnostics.Loading_module_0_from_node_modules_folder_target_file_type_1, moduleName, Extensions[extensions]);
-                }
-                var resolved_1 = loadModuleFromNodeModules(extensions, moduleName, containingDirectory, failedLookupLocations, state, cache);
-                if (!resolved_1)
-                    return undefined;
-                var resolvedValue = resolved_1.value;
-                var originalPath = void 0;
-                if (!compilerOptions.preserveSymlinks && resolvedValue) {
-                    originalPath = resolvedValue.path;
-                    var path = realPath(resolvedValue.path, host, traceEnabled);
-                    if (path === originalPath) {
-                        originalPath = undefined;
-                    }
-                    resolvedValue = __assign({}, resolvedValue, { path: path });
-                }
-                // For node_modules lookups, get the real path so that multiple accesses to an `npm link`-ed module do not create duplicate files.
-                return { value: resolvedValue && { resolved: resolvedValue, originalPath: originalPath, isExternalLibraryImport: true } };
-            }
-            else {
-                var _a = ts.normalizePathAndParts(ts.combinePaths(containingDirectory, moduleName)), candidate = _a.path, parts = _a.parts;
-                var resolved_2 = nodeLoadModuleByRelativeName(extensions, candidate, failedLookupLocations, /*onlyRecordFailures*/ false, state, /*considerPackageJson*/ true);
-                // Treat explicit "node_modules" import as an external library import.
-                return resolved_2 && toSearchResult({ resolved: resolved_2, isExternalLibraryImport: ts.contains(parts, "node_modules") });
-            }
-        }
-    }
-    function realPath(path, host, traceEnabled) {
-        if (!host.realpath) {
-            return path;
-        }
-        var real = ts.normalizePath(host.realpath(path));
-        if (traceEnabled) {
-            trace(host, ts.Diagnostics.Resolving_real_path_for_0_result_1, path, real);
-        }
-        ts.Debug.assert(host.fileExists(real), path + " linked to nonexistent file " + real); // tslint:disable-line
-        return real;
-    }
-    function nodeLoadModuleByRelativeName(extensions, candidate, failedLookupLocations, onlyRecordFailures, state, considerPackageJson) {
-        if (state.traceEnabled) {
-            trace(state.host, ts.Diagnostics.Loading_module_as_file_Slash_folder_candidate_module_location_0_target_file_type_1, candidate, Extensions[extensions]);
-        }
-        if (!ts.hasTrailingDirectorySeparator(candidate)) {
-            if (!onlyRecordFailures) {
-                var parentOfCandidate = ts.getDirectoryPath(candidate);
-                if (!directoryProbablyExists(parentOfCandidate, state.host)) {
-                    if (state.traceEnabled) {
-                        trace(state.host, ts.Diagnostics.Directory_0_does_not_exist_skipping_all_lookups_in_it, parentOfCandidate);
-                    }
-                    onlyRecordFailures = true;
-                }
-            }
-            var resolvedFromFile = loadModuleFromFile(extensions, candidate, failedLookupLocations, onlyRecordFailures, state);
-            if (resolvedFromFile) {
-                var nm = considerPackageJson ? parseNodeModuleFromPath(resolvedFromFile) : undefined;
-                var packageId = nm && getPackageJsonInfo(nm.packageDirectory, nm.subModuleName, failedLookupLocations, /*onlyRecordFailures*/ false, state).packageId;
-                return withPackageId(packageId, resolvedFromFile);
-            }
-        }
-        if (!onlyRecordFailures) {
-            var candidateExists = directoryProbablyExists(candidate, state.host);
-            if (!candidateExists) {
-                if (state.traceEnabled) {
-                    trace(state.host, ts.Diagnostics.Directory_0_does_not_exist_skipping_all_lookups_in_it, candidate);
-                }
-                onlyRecordFailures = true;
-            }
-        }
-        return loadNodeModuleFromDirectory(extensions, candidate, failedLookupLocations, onlyRecordFailures, state, considerPackageJson);
-    }
-    var nodeModulesPathPart = "/node_modules/";
-    /**
-     * This will be called on the successfully resolved path from `loadModuleFromFile`.
-     * (Not neeeded for `loadModuleFromNodeModules` as that looks up the `package.json` as part of resolution.)
-     *
-     * packageDirectory is the directory of the package itself.
-     * subModuleName is the path within the package.
-     *   For `blah/node_modules/foo/index.d.ts` this is { packageDirectory: "foo", subModuleName: "index.d.ts" }. (Part before "/node_modules/" is ignored.)
-     *   For `/node_modules/foo/bar.d.ts` this is { packageDirectory: "foo", subModuleName": "bar/index.d.ts" }.
-     *   For `/node_modules/@types/foo/bar/index.d.ts` this is { packageDirectory: "@types/foo", subModuleName: "bar/index.d.ts" }.
-     *   For `/node_modules/foo/bar/index.d.ts` this is { packageDirectory: "foo", subModuleName": "bar/index.d.ts" }.
-     */
-    function parseNodeModuleFromPath(resolved) {
-        var path = ts.normalizePath(resolved.path);
-        var idx = path.lastIndexOf(nodeModulesPathPart);
-        if (idx === -1) {
-            return undefined;
-        }
-        var indexAfterNodeModules = idx + nodeModulesPathPart.length;
-        var indexAfterPackageName = moveToNextDirectorySeparatorIfAvailable(path, indexAfterNodeModules);
-        if (path.charCodeAt(indexAfterNodeModules) === 64 /* at */) {
-            indexAfterPackageName = moveToNextDirectorySeparatorIfAvailable(path, indexAfterPackageName);
-        }
-        var packageDirectory = path.slice(0, indexAfterPackageName);
-        var subModuleName = ts.removeExtension(path.slice(indexAfterPackageName + 1), resolved.ext) + ".d.ts" /* Dts */;
-        return { packageDirectory: packageDirectory, subModuleName: subModuleName };
-    }
-    function moveToNextDirectorySeparatorIfAvailable(path, prevSeparatorIndex) {
-        var nextSeparatorIndex = path.indexOf(ts.directorySeparator, prevSeparatorIndex + 1);
-        return nextSeparatorIndex === -1 ? prevSeparatorIndex : nextSeparatorIndex;
-    }
-    function addExtensionAndIndex(path) {
-        if (path === "") {
-            return "index.d.ts";
-        }
-        if (ts.endsWith(path, ".d.ts")) {
-            return path;
-        }
-        if (ts.endsWith(path, "/index")) {
-            return path + ".d.ts";
-        }
-        return path + "/index.d.ts";
-    }
-    /* @internal */
-    function directoryProbablyExists(directoryName, host) {
-        // if host does not support 'directoryExists' assume that directory will exist
-        return !host.directoryExists || host.directoryExists(directoryName);
-    }
-    ts.directoryProbablyExists = directoryProbablyExists;
-    function loadModuleFromFileNoPackageId(extensions, candidate, failedLookupLocations, onlyRecordFailures, state) {
-        return noPackageId(loadModuleFromFile(extensions, candidate, failedLookupLocations, onlyRecordFailures, state));
-    }
-    /**
-     * @param {boolean} onlyRecordFailures - if true then function won't try to actually load files but instead record all attempts as failures. This flag is necessary
-     * in cases when we know upfront that all load attempts will fail (because containing folder does not exists) however we still need to record all failed lookup locations.
-     */
-    function loadModuleFromFile(extensions, candidate, failedLookupLocations, onlyRecordFailures, state) {
-        if (extensions === Extensions.Json) {
-            var extensionLess = ts.tryRemoveExtension(candidate, ".json" /* Json */);
-            return extensionLess === undefined ? undefined : tryAddingExtensions(extensionLess, extensions, failedLookupLocations, onlyRecordFailures, state);
-        }
-        // First, try adding an extension. An import of "foo" could be matched by a file "foo.ts", or "foo.js" by "foo.js.ts"
-        var resolvedByAddingExtension = tryAddingExtensions(candidate, extensions, failedLookupLocations, onlyRecordFailures, state);
-        if (resolvedByAddingExtension) {
-            return resolvedByAddingExtension;
-        }
-        // If that didn't work, try stripping a ".js" or ".jsx" extension and replacing it with a TypeScript one;
-        // e.g. "./foo.js" can be matched by "./foo.ts" or "./foo.d.ts"
-        if (ts.hasJavaScriptFileExtension(candidate)) {
-            var extensionless = ts.removeFileExtension(candidate);
-            if (state.traceEnabled) {
-                var extension = candidate.substring(extensionless.length);
-                trace(state.host, ts.Diagnostics.File_name_0_has_a_1_extension_stripping_it, candidate, extension);
-            }
-            return tryAddingExtensions(extensionless, extensions, failedLookupLocations, onlyRecordFailures, state);
-        }
-    }
-    /** Try to return an existing file that adds one of the `extensions` to `candidate`. */
-    function tryAddingExtensions(candidate, extensions, failedLookupLocations, onlyRecordFailures, state) {
-        if (!onlyRecordFailures) {
-            // check if containing folder exists - if it doesn't then just record failures for all supported extensions without disk probing
-            var directory_1 = ts.getDirectoryPath(candidate);
-            if (directory_1) {
-                onlyRecordFailures = !directoryProbablyExists(directory_1, state.host);
-            }
-        }
-        switch (extensions) {
-            case Extensions.DtsOnly:
-                return tryExtension(".d.ts" /* Dts */);
-            case Extensions.TypeScript:
-                return tryExtension(".ts" /* Ts */) || tryExtension(".tsx" /* Tsx */) || tryExtension(".d.ts" /* Dts */);
-            case Extensions.JavaScript:
-                return tryExtension(".js" /* Js */) || tryExtension(".jsx" /* Jsx */);
-            case Extensions.Json:
-                return tryExtension(".json" /* Json */);
-        }
-        function tryExtension(ext) {
-            var path = tryFile(candidate + ext, failedLookupLocations, onlyRecordFailures, state);
-            return path === undefined ? undefined : { path: path, ext: ext };
-        }
-    }
-    /** Return the file if it exists. */
-    function tryFile(fileName, failedLookupLocations, onlyRecordFailures, state) {
-        if (!onlyRecordFailures) {
-            if (state.host.fileExists(fileName)) {
-                if (state.traceEnabled) {
-                    trace(state.host, ts.Diagnostics.File_0_exist_use_it_as_a_name_resolution_result, fileName);
-                }
-                return fileName;
-            }
-            else {
-                if (state.traceEnabled) {
-                    trace(state.host, ts.Diagnostics.File_0_does_not_exist, fileName);
-                }
-            }
-        }
-        failedLookupLocations.push(fileName);
-        return undefined;
-    }
-    function loadNodeModuleFromDirectory(extensions, candidate, failedLookupLocations, onlyRecordFailures, state, considerPackageJson) {
-        if (considerPackageJson === void 0) { considerPackageJson = true; }
-        var _a = considerPackageJson
-            ? getPackageJsonInfo(candidate, "", failedLookupLocations, onlyRecordFailures, state)
-            : { packageJsonContent: undefined, packageId: undefined }, packageJsonContent = _a.packageJsonContent, packageId = _a.packageId;
-        return withPackageId(packageId, loadNodeModuleFromDirectoryWorker(extensions, candidate, failedLookupLocations, onlyRecordFailures, state, packageJsonContent));
-    }
-    function loadNodeModuleFromDirectoryWorker(extensions, candidate, failedLookupLocations, onlyRecordFailures, state, packageJsonContent) {
-        var fromPackageJson = packageJsonContent && loadModuleFromPackageJson(packageJsonContent, extensions, candidate, failedLookupLocations, state);
-        if (fromPackageJson) {
-            return fromPackageJson;
-        }
-        var directoryExists = !onlyRecordFailures && directoryProbablyExists(candidate, state.host);
-        return loadModuleFromFile(extensions, ts.combinePaths(candidate, "index"), failedLookupLocations, !directoryExists, state);
-    }
-    function getPackageJsonInfo(nodeModuleDirectory, subModuleName, failedLookupLocations, onlyRecordFailures, state) {
-        var host = state.host, traceEnabled = state.traceEnabled;
-        var directoryExists = !onlyRecordFailures && directoryProbablyExists(nodeModuleDirectory, host);
-        var packageJsonPath = pathToPackageJson(nodeModuleDirectory);
-        if (directoryExists && host.fileExists(packageJsonPath)) {
-            var packageJsonContent = readJson(packageJsonPath, host);
-            if (subModuleName === "") { // looking up the root - need to handle types/typings/main redirects for subModuleName
-                var path = tryReadPackageJsonFields(/*readTypes*/ true, packageJsonContent, nodeModuleDirectory, state);
-                if (typeof path === "string") {
-                    subModuleName = addExtensionAndIndex(path.substring(nodeModuleDirectory.length + 1));
-                }
-                else {
-                    var jsPath = tryReadPackageJsonFields(/*readTypes*/ false, packageJsonContent, nodeModuleDirectory, state);
-                    if (typeof jsPath === "string" && jsPath.length > nodeModuleDirectory.length) {
-                        var potentialSubModule_1 = jsPath.substring(nodeModuleDirectory.length + 1);
-                        subModuleName = (ts.forEach(ts.supportedJavascriptExtensions, function (extension) {
-                            return ts.tryRemoveExtension(potentialSubModule_1, extension);
-                        }) || potentialSubModule_1) + ".d.ts" /* Dts */;
-                    }
-                    else {
-                        subModuleName = "index.d.ts";
-                    }
-                }
-            }
-            if (!ts.endsWith(subModuleName, ".d.ts" /* Dts */)) {
-                subModuleName = addExtensionAndIndex(subModuleName);
-            }
-            var packageId = typeof packageJsonContent.name === "string" && typeof packageJsonContent.version === "string"
-                ? { name: packageJsonContent.name, subModuleName: subModuleName, version: packageJsonContent.version }
-                : undefined;
-            if (traceEnabled) {
-                if (packageId) {
-                    trace(host, ts.Diagnostics.Found_package_json_at_0_Package_ID_is_1, packageJsonPath, ts.packageIdToString(packageId));
-                }
-                else {
-                    trace(host, ts.Diagnostics.Found_package_json_at_0, packageJsonPath);
-                }
-            }
-            return { found: true, packageJsonContent: packageJsonContent, packageId: packageId };
-        }
-        else {
-            if (directoryExists && traceEnabled) {
-                trace(host, ts.Diagnostics.File_0_does_not_exist, packageJsonPath);
-            }
-            // record package json as one of failed lookup locations - in the future if this file will appear it will invalidate resolution results
-            failedLookupLocations.push(packageJsonPath);
-            return { found: false, packageJsonContent: undefined, packageId: undefined };
-        }
-    }
-    function loadModuleFromPackageJson(jsonContent, extensions, candidate, failedLookupLocations, state) {
-        var file = tryReadPackageJsonFields(extensions !== Extensions.JavaScript && extensions !== Extensions.Json, jsonContent, candidate, state);
-        if (!file) {
-            if (extensions === Extensions.TypeScript) {
-                // When resolving typescript modules, try resolving using main field as well
-                file = tryReadPackageJsonFields(/*readTypes*/ false, jsonContent, candidate, state);
-                if (!file) {
-                    return undefined;
-                }
-            }
-            else {
-                return undefined;
-            }
-        }
-        var onlyRecordFailures = !directoryProbablyExists(ts.getDirectoryPath(file), state.host);
-        var fromFile = tryFile(file, failedLookupLocations, onlyRecordFailures, state);
-        if (fromFile) {
-            var resolved = resolvedIfExtensionMatches(extensions, fromFile);
-            if (resolved) {
-                return resolved;
-            }
-            if (state.traceEnabled) {
-                trace(state.host, ts.Diagnostics.File_0_has_an_unsupported_extension_so_skipping_it, fromFile);
-            }
-        }
-        // Even if extensions is DtsOnly, we can still look up a .ts file as a result of package.json "types"
-        var nextExtensions = extensions === Extensions.DtsOnly ? Extensions.TypeScript : extensions;
-        // Don't do package.json lookup recursively, because Node.js' package lookup doesn't.
-        var result = nodeLoadModuleByRelativeName(nextExtensions, file, failedLookupLocations, onlyRecordFailures, state, /*considerPackageJson*/ false);
-        if (result) {
-            // It won't have a `packageId` set, because we disabled `considerPackageJson`.
-            ts.Debug.assert(result.packageId === undefined);
-            return { path: result.path, ext: result.extension };
-        }
-    }
-    /** Resolve from an arbitrarily specified file. Return `undefined` if it has an unsupported extension. */
-    function resolvedIfExtensionMatches(extensions, path) {
-        var ext = ts.tryGetExtensionFromPath(path);
-        return ext !== undefined && extensionIsOk(extensions, ext) ? { path: path, ext: ext } : undefined;
-    }
-    /** True if `extension` is one of the supported `extensions`. */
-    function extensionIsOk(extensions, extension) {
-        switch (extensions) {
-            case Extensions.JavaScript:
-                return extension === ".js" /* Js */ || extension === ".jsx" /* Jsx */;
-            case Extensions.Json:
-                return extension === ".json" /* Json */;
-            case Extensions.TypeScript:
-                return extension === ".ts" /* Ts */ || extension === ".tsx" /* Tsx */ || extension === ".d.ts" /* Dts */;
-            case Extensions.DtsOnly:
-                return extension === ".d.ts" /* Dts */;
-        }
-    }
-    function pathToPackageJson(directory) {
-        return ts.combinePaths(directory, "package.json");
-    }
-    function loadModuleFromNodeModulesFolder(extensions, moduleName, nodeModulesFolder, nodeModulesFolderExists, failedLookupLocations, state) {
-        var candidate = ts.normalizePath(ts.combinePaths(nodeModulesFolder, moduleName));
-        // First look for a nested package.json, as in `node_modules/foo/bar/package.json`.
-        var packageJsonContent;
-        var packageId;
-        var packageInfo = getPackageJsonInfo(candidate, "", failedLookupLocations, /*onlyRecordFailures*/ !nodeModulesFolderExists, state);
-        if (packageInfo.found) {
-            (packageJsonContent = packageInfo.packageJsonContent, packageId = packageInfo.packageId);
-        }
-        else {
-            var _a = getPackageName(moduleName), packageName = _a.packageName, rest = _a.rest;
-            if (rest !== "") { // If "rest" is empty, we just did this search above.
-                var packageRootPath = ts.combinePaths(nodeModulesFolder, packageName);
-                // Don't use a "types" or "main" from here because we're not loading the root, but a subdirectory -- just here for the packageId.
-                packageId = getPackageJsonInfo(packageRootPath, rest, failedLookupLocations, !nodeModulesFolderExists, state).packageId;
-            }
-        }
-        var pathAndExtension = loadModuleFromFile(extensions, candidate, failedLookupLocations, !nodeModulesFolderExists, state) ||
-            loadNodeModuleFromDirectoryWorker(extensions, candidate, failedLookupLocations, !nodeModulesFolderExists, state, packageJsonContent);
-        return withPackageId(packageId, pathAndExtension);
-    }
-    /* @internal */
-    function getPackageName(moduleName) {
-        var idx = moduleName.indexOf(ts.directorySeparator);
-        if (moduleName[0] === "@") {
-            idx = moduleName.indexOf(ts.directorySeparator, idx + 1);
-        }
-        return idx === -1 ? { packageName: moduleName, rest: "" } : { packageName: moduleName.slice(0, idx), rest: moduleName.slice(idx + 1) };
-    }
-    ts.getPackageName = getPackageName;
-    function loadModuleFromNodeModules(extensions, moduleName, directory, failedLookupLocations, state, cache) {
-        return loadModuleFromNodeModulesWorker(extensions, moduleName, directory, failedLookupLocations, state, /*typesOnly*/ false, cache);
-    }
-    function loadModuleFromNodeModulesAtTypes(moduleName, directory, failedLookupLocations, state) {
-        // Extensions parameter here doesn't actually matter, because typesOnly ensures we're just doing @types lookup, which is always DtsOnly.
-        return loadModuleFromNodeModulesWorker(Extensions.DtsOnly, moduleName, directory, failedLookupLocations, state, /*typesOnly*/ true, /*cache*/ undefined);
-    }
-    function loadModuleFromNodeModulesWorker(extensions, moduleName, directory, failedLookupLocations, state, typesOnly, cache) {
-        var perModuleNameCache = cache && cache.getOrCreateCacheForModuleName(moduleName);
-        return ts.forEachAncestorDirectory(ts.normalizeSlashes(directory), function (ancestorDirectory) {
-            if (ts.getBaseFileName(ancestorDirectory) !== "node_modules") {
-                var resolutionFromCache = tryFindNonRelativeModuleNameInCache(perModuleNameCache, moduleName, ancestorDirectory, state.traceEnabled, state.host, failedLookupLocations);
-                if (resolutionFromCache) {
-                    return resolutionFromCache;
-                }
-                return toSearchResult(loadModuleFromNodeModulesOneLevel(extensions, moduleName, ancestorDirectory, failedLookupLocations, state, typesOnly));
-            }
-        });
-    }
-    /** Load a module from a single node_modules directory, but not from any ancestors' node_modules directories. */
-    function loadModuleFromNodeModulesOneLevel(extensions, moduleName, directory, failedLookupLocations, state, typesOnly) {
-        if (typesOnly === void 0) { typesOnly = false; }
-        var nodeModulesFolder = ts.combinePaths(directory, "node_modules");
-        var nodeModulesFolderExists = directoryProbablyExists(nodeModulesFolder, state.host);
-        if (!nodeModulesFolderExists && state.traceEnabled) {
-            trace(state.host, ts.Diagnostics.Directory_0_does_not_exist_skipping_all_lookups_in_it, nodeModulesFolder);
-        }
-        var packageResult = typesOnly ? undefined : loadModuleFromNodeModulesFolder(extensions, moduleName, nodeModulesFolder, nodeModulesFolderExists, failedLookupLocations, state);
-        if (packageResult) {
-            return packageResult;
-        }
-        if (extensions !== Extensions.JavaScript && extensions !== Extensions.Json) {
-            var nodeModulesAtTypes_1 = ts.combinePaths(nodeModulesFolder, "@types");
-            var nodeModulesAtTypesExists = nodeModulesFolderExists;
-            if (nodeModulesFolderExists && !directoryProbablyExists(nodeModulesAtTypes_1, state.host)) {
-                if (state.traceEnabled) {
-                    trace(state.host, ts.Diagnostics.Directory_0_does_not_exist_skipping_all_lookups_in_it, nodeModulesAtTypes_1);
-                }
-                nodeModulesAtTypesExists = false;
-            }
-            return loadModuleFromNodeModulesFolder(Extensions.DtsOnly, mangleScopedPackage(moduleName, state), nodeModulesAtTypes_1, nodeModulesAtTypesExists, failedLookupLocations, state);
-        }
-    }
-    /** Double underscores are used in DefinitelyTyped to delimit scoped packages. */
-    var mangledScopedPackageSeparator = "__";
-    /** For a scoped package, we must look in `@types/foo__bar` instead of `@types/@foo/bar`. */
-    function mangleScopedPackage(packageName, state) {
-        var mangled = getMangledNameForScopedPackage(packageName);
-        if (state.traceEnabled && mangled !== packageName) {
-            trace(state.host, ts.Diagnostics.Scoped_package_detected_looking_in_0, mangled);
-        }
-        return mangled;
-    }
-    /* @internal */
-    function getTypesPackageName(packageName) {
-        return "@types/" + getMangledNameForScopedPackage(packageName);
-    }
-    ts.getTypesPackageName = getTypesPackageName;
-    /* @internal */
-    function getMangledNameForScopedPackage(packageName) {
-        if (ts.startsWith(packageName, "@")) {
-            var replaceSlash = packageName.replace(ts.directorySeparator, mangledScopedPackageSeparator);
-            if (replaceSlash !== packageName) {
-                return replaceSlash.slice(1); // Take off the "@"
-            }
-        }
-        return packageName;
-    }
-    ts.getMangledNameForScopedPackage = getMangledNameForScopedPackage;
-    /* @internal */
-    function getPackageNameFromAtTypesDirectory(mangledName) {
-        var withoutAtTypePrefix = ts.removePrefix(mangledName, "@types/");
-        if (withoutAtTypePrefix !== mangledName) {
-            return getUnmangledNameForScopedPackage(withoutAtTypePrefix);
-        }
-        return mangledName;
-    }
-    ts.getPackageNameFromAtTypesDirectory = getPackageNameFromAtTypesDirectory;
-    /* @internal */
-    function getUnmangledNameForScopedPackage(typesPackageName) {
-        return ts.stringContains(typesPackageName, mangledScopedPackageSeparator) ?
-            "@" + typesPackageName.replace(mangledScopedPackageSeparator, ts.directorySeparator) :
-            typesPackageName;
-    }
-    ts.getUnmangledNameForScopedPackage = getUnmangledNameForScopedPackage;
-    function tryFindNonRelativeModuleNameInCache(cache, moduleName, containingDirectory, traceEnabled, host, failedLookupLocations) {
-        var result = cache && cache.get(containingDirectory);
-        if (result) {
-            if (traceEnabled) {
-                trace(host, ts.Diagnostics.Resolution_for_module_0_was_found_in_cache_from_location_1, moduleName, containingDirectory);
-            }
-            failedLookupLocations.push.apply(failedLookupLocations, result.failedLookupLocations);
-            return { value: result.resolvedModule && { path: result.resolvedModule.resolvedFileName, extension: result.resolvedModule.extension, packageId: result.resolvedModule.packageId } };
-        }
-    }
-    function classicNameResolver(moduleName, containingFile, compilerOptions, host, cache) {
-        var traceEnabled = isTraceEnabled(compilerOptions, host);
-        var state = { compilerOptions: compilerOptions, host: host, traceEnabled: traceEnabled };
-        var failedLookupLocations = [];
-        var containingDirectory = ts.getDirectoryPath(containingFile);
-        var resolved = tryResolve(Extensions.TypeScript) || tryResolve(Extensions.JavaScript);
-        // No originalPath because classic resolution doesn't resolve realPath
-        return createResolvedModuleWithFailedLookupLocations(resolved && resolved.value, /*originalPath*/ undefined, /*isExternalLibraryImport*/ false, failedLookupLocations);
-        function tryResolve(extensions) {
-            var resolvedUsingSettings = tryLoadModuleUsingOptionalResolutionSettings(extensions, moduleName, containingDirectory, loadModuleFromFileNoPackageId, failedLookupLocations, state);
-            if (resolvedUsingSettings) {
-                return { value: resolvedUsingSettings };
-            }
-            var perModuleNameCache = cache && cache.getOrCreateCacheForModuleName(moduleName);
-            if (!ts.isExternalModuleNameRelative(moduleName)) {
-                // Climb up parent directories looking for a module.
-                var resolved_3 = ts.forEachAncestorDirectory(containingDirectory, function (directory) {
-                    var resolutionFromCache = tryFindNonRelativeModuleNameInCache(perModuleNameCache, moduleName, directory, traceEnabled, host, failedLookupLocations);
-                    if (resolutionFromCache) {
-                        return resolutionFromCache;
-                    }
-                    var searchName = ts.normalizePath(ts.combinePaths(directory, moduleName));
-                    return toSearchResult(loadModuleFromFileNoPackageId(extensions, searchName, failedLookupLocations, /*onlyRecordFailures*/ false, state));
-                });
-                if (resolved_3) {
-                    return resolved_3;
-                }
-                if (extensions === Extensions.TypeScript) {
-                    // If we didn't find the file normally, look it up in @types.
-                    return loadModuleFromNodeModulesAtTypes(moduleName, containingDirectory, failedLookupLocations, state);
-                }
-            }
-            else {
-                var candidate = ts.normalizePath(ts.combinePaths(containingDirectory, moduleName));
-                return toSearchResult(loadModuleFromFileNoPackageId(extensions, candidate, failedLookupLocations, /*onlyRecordFailures*/ false, state));
-            }
-        }
-    }
-    ts.classicNameResolver = classicNameResolver;
-    /**
-     * LSHost may load a module from a global cache of typings.
-     * This is the minumum code needed to expose that functionality; the rest is in LSHost.
-     */
-    /* @internal */
-    function loadModuleFromGlobalCache(moduleName, projectName, compilerOptions, host, globalCache) {
-        var traceEnabled = isTraceEnabled(compilerOptions, host);
-        if (traceEnabled) {
-            trace(host, ts.Diagnostics.Auto_discovery_for_typings_is_enabled_in_project_0_Running_extra_resolution_pass_for_module_1_using_cache_location_2, projectName, moduleName, globalCache);
-        }
-        var state = { compilerOptions: compilerOptions, host: host, traceEnabled: traceEnabled };
-        var failedLookupLocations = [];
-        var resolved = loadModuleFromNodeModulesOneLevel(Extensions.DtsOnly, moduleName, globalCache, failedLookupLocations, state);
-        return createResolvedModuleWithFailedLookupLocations(resolved, /*originalPath*/ undefined, /*isExternalLibraryImport*/ true, failedLookupLocations);
-    }
-    ts.loadModuleFromGlobalCache = loadModuleFromGlobalCache;
-    /**
-     * Wraps value to SearchResult.
-     * @returns undefined if value is undefined or { value } otherwise
-     */
-    function toSearchResult(value) {
-        return value !== undefined ? { value: value } : undefined;
-    }
-})(ts || (ts = {}));
 /* @internal */
 var ts;
 (function (ts) {
@@ -26789,6 +29198,8 @@ var ts;
             createPromiseType: createPromiseType,
             createArrayType: createArrayType,
             getBooleanType: function () { return booleanType; },
+            getFalseType: function () { return falseType; },
+            getTrueType: function () { return trueType; },
             getVoidType: function () { return voidType; },
             getUndefinedType: function () { return undefinedType; },
             getNullType: function () { return nullType; },
@@ -26874,9 +29285,9 @@ var ts;
         var nullWideningType = strictNullChecks ? nullType : createIntrinsicType(16384 /* Null */ | 134217728 /* ContainsWideningType */, "null");
         var stringType = createIntrinsicType(4 /* String */, "string");
         var numberType = createIntrinsicType(8 /* Number */, "number");
-        var trueType = createIntrinsicType(256 /* BooleanLiteral */, "true");
         var falseType = createIntrinsicType(256 /* BooleanLiteral */, "false");
-        var booleanType = createBooleanType([trueType, falseType]);
+        var trueType = createIntrinsicType(256 /* BooleanLiteral */, "true");
+        var booleanType = createBooleanType([falseType, trueType]);
         var esSymbolType = createIntrinsicType(1024 /* ESSymbol */, "symbol");
         var voidType = createIntrinsicType(4096 /* Void */, "void");
         var neverType = createIntrinsicType(32768 /* Never */, "never");
@@ -27263,17 +29674,17 @@ var ts;
         }
         function getJsxNamespace(location) {
             if (location) {
-                var file_1 = ts.getSourceFileOfNode(location);
-                if (file_1) {
-                    if (file_1.localJsxNamespace) {
-                        return file_1.localJsxNamespace;
+                var file = ts.getSourceFileOfNode(location);
+                if (file) {
+                    if (file.localJsxNamespace) {
+                        return file.localJsxNamespace;
                     }
-                    var jsxPragma = file_1.pragmas.get("jsx");
+                    var jsxPragma = file.pragmas.get("jsx");
                     if (jsxPragma) {
                         var chosenpragma = ts.isArray(jsxPragma) ? jsxPragma[0] : jsxPragma; // TODO: GH#18217
-                        file_1.localJsxFactory = ts.parseIsolatedEntityName(chosenpragma.arguments.factory, languageVersion);
-                        if (file_1.localJsxFactory) {
-                            return file_1.localJsxNamespace = getFirstIdentifier(file_1.localJsxFactory).escapedText;
+                        file.localJsxFactory = ts.parseIsolatedEntityName(chosenpragma.arguments.factory, languageVersion);
+                        if (file.localJsxFactory) {
+                            return file.localJsxNamespace = getFirstIdentifier(file.localJsxFactory).escapedText;
                         }
                     }
                 }
@@ -27401,7 +29812,7 @@ var ts;
                 target.flags |= source.flags;
                 if (source.valueDeclaration &&
                     (!target.valueDeclaration ||
-                        (target.valueDeclaration.kind === 239 /* ModuleDeclaration */ && source.valueDeclaration.kind !== 239 /* ModuleDeclaration */))) {
+                        ts.isEffectiveModuleDeclaration(target.valueDeclaration) && !ts.isEffectiveModuleDeclaration(source.valueDeclaration))) {
                     // other kinds of value declarations take precedence over modules
                     target.valueDeclaration = source.valueDeclaration;
                 }
@@ -28226,8 +30637,8 @@ var ts;
                 else {
                     exportDefaultSymbol = resolveExportByName(moduleSymbol, "default" /* Default */, dontResolveAlias);
                 }
-                var file_2 = ts.find(moduleSymbol.declarations, ts.isSourceFile);
-                var hasSyntheticDefault = canHaveSyntheticDefault(file_2, moduleSymbol, dontResolveAlias);
+                var file = ts.find(moduleSymbol.declarations, ts.isSourceFile);
+                var hasSyntheticDefault = canHaveSyntheticDefault(file, moduleSymbol, dontResolveAlias);
                 if (!exportDefaultSymbol && !hasSyntheticDefault) {
                     error(node.name, ts.Diagnostics.Module_0_has_no_default_export, symbolToString(moduleSymbol));
                 }
@@ -28493,32 +30904,32 @@ var ts;
             else if (name.kind === 146 /* QualifiedName */ || name.kind === 185 /* PropertyAccessExpression */) {
                 var left = name.kind === 146 /* QualifiedName */ ? name.left : name.expression;
                 var right = name.kind === 146 /* QualifiedName */ ? name.right : name.name;
-                var namespace_1 = resolveEntityName(left, namespaceMeaning, ignoreErrors, /*dontResolveAlias*/ false, location);
-                if (!namespace_1 || ts.nodeIsMissing(right)) {
+                var namespace = resolveEntityName(left, namespaceMeaning, ignoreErrors, /*dontResolveAlias*/ false, location);
+                if (!namespace || ts.nodeIsMissing(right)) {
                     return undefined;
                 }
-                else if (namespace_1 === unknownSymbol) {
-                    return namespace_1;
+                else if (namespace === unknownSymbol) {
+                    return namespace;
                 }
                 if (ts.isInJavaScriptFile(name)) {
-                    if (namespace_1.valueDeclaration &&
-                        ts.isVariableDeclaration(namespace_1.valueDeclaration) &&
-                        namespace_1.valueDeclaration.initializer &&
-                        isCommonJsRequire(namespace_1.valueDeclaration.initializer)) {
-                        var moduleName = namespace_1.valueDeclaration.initializer.arguments[0];
+                    if (namespace.valueDeclaration &&
+                        ts.isVariableDeclaration(namespace.valueDeclaration) &&
+                        namespace.valueDeclaration.initializer &&
+                        isCommonJsRequire(namespace.valueDeclaration.initializer)) {
+                        var moduleName = namespace.valueDeclaration.initializer.arguments[0];
                         var moduleSym = resolveExternalModuleName(moduleName, moduleName);
                         if (moduleSym) {
                             var resolvedModuleSymbol = resolveExternalModuleSymbol(moduleSym);
                             if (resolvedModuleSymbol) {
-                                namespace_1 = resolvedModuleSymbol;
+                                namespace = resolvedModuleSymbol;
                             }
                         }
                     }
                 }
-                symbol = getSymbol(getExportsOfSymbol(namespace_1), right.escapedText, meaning);
+                symbol = getSymbol(getExportsOfSymbol(namespace), right.escapedText, meaning);
                 if (!symbol) {
                     if (!ignoreErrors) {
-                        error(right, ts.Diagnostics.Namespace_0_has_no_exported_member_1, getFullyQualifiedName(namespace_1), ts.declarationNameToString(right));
+                        error(right, ts.Diagnostics.Namespace_0_has_no_exported_member_1, getFullyQualifiedName(namespace), ts.declarationNameToString(right));
                     }
                     return undefined;
                 }
@@ -28889,8 +31300,8 @@ var ts;
         }
         function findConstructorDeclaration(node) {
             var members = node.members;
-            for (var _i = 0, members_2 = members; _i < members_2.length; _i++) {
-                var member = members_2[_i];
+            for (var _i = 0, members_1 = members; _i < members_1.length; _i++) {
+                var member = members_1[_i];
                 if (member.kind === 155 /* Constructor */ && ts.nodeIsPresent(member.body)) {
                     return member;
                 }
@@ -29190,7 +31601,7 @@ var ts;
         }
         function hasVisibleDeclarations(symbol, shouldComputeAliasToMakeVisible) {
             var aliasesToMakeVisible;
-            if (ts.forEach(symbol.declarations, function (declaration) { return !getIsDeclarationVisible(declaration); })) {
+            if (!ts.every(symbol.declarations, getIsDeclarationVisible)) {
                 return undefined;
             }
             return { accessibility: 0 /* Accessible */, aliasesToMakeVisible: aliasesToMakeVisible };
@@ -29792,9 +32203,13 @@ var ts;
                         context.enclosingDeclaration = undefined;
                         if (ts.getCheckFlags(propertySymbol) & 1024 /* Late */) {
                             var decl = ts.first(propertySymbol.declarations);
-                            var name = hasLateBindableName(decl) && resolveEntityName(decl.name.expression, 67216319 /* Value */);
-                            if (name && context.tracker.trackSymbol) {
-                                context.tracker.trackSymbol(name, saveEnclosingDeclaration, 67216319 /* Value */);
+                            if (context.tracker.trackSymbol && hasLateBindableName(decl)) {
+                                // get symbol of the first identifier of the entityName
+                                var firstIdentifier = getFirstIdentifier(decl.name.expression);
+                                var name = resolveName(firstIdentifier, firstIdentifier.escapedText, 67216319 /* Value */ | 1048576 /* ExportValue */, /*nodeNotFoundErrorMessage*/ undefined, /*nameArg*/ undefined, /*isUse*/ true);
+                                if (name) {
+                                    context.tracker.trackSymbol(name, saveEnclosingDeclaration, 67216319 /* Value */);
+                                }
                             }
                         }
                         var propertyName = symbolToName(propertySymbol, context, 67216319 /* Value */, /*expectsIdentifier*/ true);
@@ -30253,8 +32668,8 @@ var ts;
             }
             if (symbol.declarations && symbol.declarations.length) {
                 if (ts.some(symbol.declarations, hasExternalModuleSymbol) && context.enclosingDeclaration) { // TODO: GH#18217
-                    var file_3 = ts.getDeclarationOfKind(symbol, 274 /* SourceFile */);
-                    if (!file_3 || !context.tracker.moduleResolverHost) {
+                    var file = ts.getDeclarationOfKind(symbol, 274 /* SourceFile */);
+                    if (!file || !context.tracker.moduleResolverHost) {
                         if (context.tracker.trackReferencedAmbientModule) {
                             var ambientDecls = ts.filter(symbol.declarations, ts.isAmbientModule);
                             if (ts.length(ambientDecls)) {
@@ -30267,7 +32682,8 @@ var ts;
                         // ambient module, just use declaration/symbol name (fallthrough)
                     }
                     else {
-                        return "\"" + ts.getResolvedExternalModuleName(context.tracker.moduleResolverHost, file_3, ts.getSourceFileOfNode(ts.getOriginalNode(context.enclosingDeclaration))) + "\"";
+                        var contextFile = ts.getSourceFileOfNode(ts.getOriginalNode(context.enclosingDeclaration));
+                        return "\"" + (file.moduleName || ts.moduleSpecifiers.getModuleSpecifier(compilerOptions, contextFile, contextFile.path, file.path, context.tracker.moduleResolverHost)) + "\"";
                     }
                 }
                 var declaration = symbol.declarations[0];
@@ -30791,7 +33207,7 @@ var ts;
             var definedInConstructor = false;
             var definedInMethod = false;
             var jsDocType;
-            var _loop_3 = function (declaration) {
+            var _loop_1 = function (declaration) {
                 var declarationInConstructor = false;
                 var expression = declaration.kind === 200 /* BinaryExpression */ ? declaration :
                     declaration.kind === 185 /* PropertyAccessExpression */ ? ts.cast(declaration.parent, ts.isBinaryExpression) :
@@ -30834,20 +33250,20 @@ var ts;
                         special === 2 /* ModuleExports */ &&
                         symbol.escapedName === "export=" /* ExportEquals */) {
                         var exportedType_1 = resolveStructuredTypeMembers(type_2);
-                        var members_3 = ts.createSymbolTable();
-                        ts.copyEntries(exportedType_1.members, members_3);
+                        var members_2 = ts.createSymbolTable();
+                        ts.copyEntries(exportedType_1.members, members_2);
                         symbol.exports.forEach(function (s, name) {
-                            if (members_3.has(name)) {
+                            if (members_2.has(name)) {
                                 var exportedMember = exportedType_1.members.get(name);
                                 var union = createSymbol(s.flags | exportedMember.flags, name);
                                 union.type = getUnionType([getTypeOfSymbol(s), getTypeOfSymbol(exportedMember)]);
-                                members_3.set(name, union);
+                                members_2.set(name, union);
                             }
                             else {
-                                members_3.set(name, s);
+                                members_2.set(name, s);
                             }
                         });
-                        type_2 = createAnonymousType(exportedType_1.symbol, members_3, exportedType_1.callSignatures, exportedType_1.constructSignatures, exportedType_1.stringIndexInfo, exportedType_1.numberIndexInfo);
+                        type_2 = createAnonymousType(exportedType_1.symbol, members_2, exportedType_1.callSignatures, exportedType_1.constructSignatures, exportedType_1.stringIndexInfo, exportedType_1.numberIndexInfo);
                     }
                     var anyedType = type_2;
                     if (isEmptyArrayLiteralType(type_2)) {
@@ -30864,7 +33280,7 @@ var ts;
             };
             for (var _i = 0, _a = symbol.declarations; _i < _a.length; _i++) {
                 var declaration = _a[_i];
-                var state_2 = _loop_3(declaration);
+                var state_2 = _loop_1(declaration);
                 if (typeof state_2 === "object")
                     return state_2.value;
             }
@@ -31333,8 +33749,8 @@ var ts;
         // The function allocates a new array if the input type parameter set is undefined, but otherwise it modifies the set
         // in-place and returns the same array.
         function appendTypeParameters(typeParameters, declarations) {
-            for (var _i = 0, declarations_2 = declarations; _i < declarations_2.length; _i++) {
-                var declaration = declarations_2[_i];
+            for (var _i = 0, declarations_1 = declarations; _i < declarations_1.length; _i++) {
+                var declaration = declarations_1[_i];
                 typeParameters = ts.appendIfUnique(typeParameters, getDeclaredTypeOfTypeParameter(getSymbolOfNode(declaration)));
             }
             return typeParameters;
@@ -31574,7 +33990,7 @@ var ts;
         // object types.
         function isValidBaseType(type) {
             return !!(type.flags & (131072 /* Object */ | 16777216 /* NonPrimitive */ | 1 /* Any */)) && !isGenericMappedType(type) ||
-                !!(type.flags & 524288 /* Intersection */) && !ts.some(type.types, function (t) { return !isValidBaseType(t); });
+                !!(type.flags & 524288 /* Intersection */) && ts.every(type.types, isValidBaseType);
         }
         function resolveBaseTypesOfInterface(type) {
             type.resolvedBaseTypes = type.resolvedBaseTypes || ts.emptyArray;
@@ -31912,8 +34328,8 @@ var ts;
         // we check symbols to see if we can quickly conclude they are free of "this" references, thus needing no instantiation.
         function createInstantiatedSymbolTable(symbols, mapper, mappingThisOnly) {
             var result = ts.createSymbolTable();
-            for (var _i = 0, symbols_2 = symbols; _i < symbols_2.length; _i++) {
-                var symbol = symbols_2[_i];
+            for (var _i = 0, symbols_1 = symbols; _i < symbols_1.length; _i++) {
+                var symbol = symbols_1[_i];
                 result.set(symbol.escapedName, mappingThisOnly && isThisless(symbol) ? symbol : instantiateSymbol(symbol, mapper));
             }
             return result;
@@ -32063,9 +34479,9 @@ var ts;
                         // If we have an existing early-bound member, combine its declarations so that we can
                         // report an error at each declaration.
                         var declarations = earlySymbol ? ts.concatenate(earlySymbol.declarations, lateSymbol.declarations) : lateSymbol.declarations;
-                        var name_2 = ts.declarationNameToString(decl.name);
-                        ts.forEach(declarations, function (declaration) { return error(ts.getNameOfDeclaration(declaration) || declaration, ts.Diagnostics.Duplicate_declaration_0, name_2); });
-                        error(decl.name || decl, ts.Diagnostics.Duplicate_declaration_0, name_2);
+                        var name_1 = ts.declarationNameToString(decl.name);
+                        ts.forEach(declarations, function (declaration) { return error(ts.getNameOfDeclaration(declaration) || declaration, ts.Diagnostics.Duplicate_declaration_0, name_1); });
+                        error(decl.name || decl, ts.Diagnostics.Duplicate_declaration_0, name_1);
                         lateSymbol = createSymbol(0 /* None */, memberName, 1024 /* Late */);
                     }
                     lateSymbol.nameType = type;
@@ -32098,8 +34514,8 @@ var ts;
                     var decl = _a[_i];
                     var members = ts.getMembersOfDeclaration(decl);
                     if (members) {
-                        for (var _b = 0, members_4 = members; _b < members_4.length; _b++) {
-                            var member = members_4[_b];
+                        for (var _b = 0, members_3 = members; _b < members_3.length; _b++) {
+                            var member = members_3[_b];
                             if (isStatic === ts.hasStaticModifier(member) && hasLateBindableName(member)) {
                                 lateBindMember(symbol, earlySymbols, lateSymbols, member);
                             }
@@ -32375,7 +34791,7 @@ var ts;
             var numberIndexInfo;
             var types = type.types;
             var mixinCount = ts.countWhere(types, isMixinConstructorType);
-            var _loop_4 = function (i) {
+            var _loop_2 = function (i) {
                 var t = type.types[i];
                 // When an intersection type contains mixin constructor types, the construct signatures from
                 // those types are discarded and their return types are mixed into the return types of all
@@ -32398,7 +34814,7 @@ var ts;
                 numberIndexInfo = intersectIndexInfos(numberIndexInfo, getIndexInfoOfType(t, 1 /* Number */));
             };
             for (var i = 0; i < types.length; i++) {
-                _loop_4(i);
+                _loop_2(i);
             }
             setStructuredTypeMembers(type, emptySymbols, callSignatures, constructSignatures, stringIndexInfo, numberIndexInfo);
         }
@@ -33978,8 +36394,8 @@ var ts;
         function getTypeOfGlobalSymbol(symbol, arity) {
             function getTypeDeclaration(symbol) {
                 var declarations = symbol.declarations;
-                for (var _i = 0, declarations_3 = declarations; _i < declarations_3.length; _i++) {
-                    var declaration = declarations_3[_i];
+                for (var _i = 0, declarations_2 = declarations; _i < declarations_2.length; _i++) {
+                    var declaration = declarations_2[_i];
                     switch (declaration.kind) {
                         case 235 /* ClassDeclaration */:
                         case 236 /* InterfaceDeclaration */:
@@ -34440,7 +36856,7 @@ var ts;
             var unionType = types[unionIndex];
             var intersection = unionType.types;
             var i = types.length - 1;
-            var _loop_5 = function () {
+            var _loop_3 = function () {
                 var t = types[i];
                 if (t.flags & 67108864 /* UnionOfUnitTypes */) {
                     intersection = ts.filter(intersection, function (u) { return containsType(t.types, u); });
@@ -34449,7 +36865,7 @@ var ts;
                 i--;
             };
             while (i > unionIndex) {
-                _loop_5();
+                _loop_3();
             }
             if (intersection === unionType.types) {
                 return false;
@@ -34838,14 +37254,14 @@ var ts;
             var isDeferred = root.isDistributive && maybeTypeOfKind(checkType, 15794176 /* Instantiable */);
             var combinedMapper;
             if (root.inferTypeParameters) {
-                var context_1 = createInferenceContext(root.inferTypeParameters, /*signature*/ undefined, 0 /* None */);
+                var context = createInferenceContext(root.inferTypeParameters, /*signature*/ undefined, 0 /* None */);
                 if (!isDeferred) {
                     // We don't want inferences from constraints as they may cause us to eagerly resolve the
                     // conditional type instead of deferring resolution. Also, we always want strict function
                     // types rules (i.e. proper contravariance) for inferences.
-                    inferTypes(context_1.inferences, checkType, extendsType, 32 /* NoConstraints */ | 64 /* AlwaysStrict */);
+                    inferTypes(context.inferences, checkType, extendsType, 32 /* NoConstraints */ | 64 /* AlwaysStrict */);
                 }
-                combinedMapper = combineTypeMappers(mapper, context_1);
+                combinedMapper = combineTypeMappers(mapper, context);
             }
             if (!isDeferred) {
                 if (extendsType.flags & 3 /* AnyOrUnknown */) {
@@ -35013,12 +37429,13 @@ var ts;
             return links.resolvedType; // TODO: GH#18217
         }
         function resolveImportSymbolType(node, links, symbol, meaning) {
-            links.resolvedSymbol = symbol;
+            var resolvedSymbol = resolveSymbol(symbol);
+            links.resolvedSymbol = resolvedSymbol;
             if (meaning === 67216319 /* Value */) {
-                return links.resolvedType = getTypeOfSymbol(symbol);
+                return links.resolvedType = getTypeOfSymbol(symbol); // intentionally doesn't use resolved symbol so type is cached as expected on the alias
             }
             else {
-                return links.resolvedType = getTypeReferenceType(node, symbol);
+                return links.resolvedType = getTypeReferenceType(node, resolvedSymbol); // getTypeReferenceType doesn't handle aliases - it must get the resolved symbol
             }
         }
         function getTypeFromTypeLiteralOrFunctionOrConstructorTypeNode(node) {
@@ -35980,7 +38397,7 @@ var ts;
             return type.flags & 131072 /* Object */ ? isEmptyResolvedType(resolveStructuredTypeMembers(type)) :
                 type.flags & 16777216 /* NonPrimitive */ ? true :
                     type.flags & 262144 /* Union */ ? ts.some(type.types, isEmptyObjectType) :
-                        type.flags & 524288 /* Intersection */ ? !ts.some(type.types, function (t) { return !isEmptyObjectType(t); }) :
+                        type.flags & 524288 /* Intersection */ ? ts.every(type.types, isEmptyObjectType) :
                             false;
         }
         function isEnumTypeRelatedTo(sourceSymbol, targetSymbol, errorReporter) {
@@ -36395,7 +38812,7 @@ var ts;
                         // check excess properties against discriminant type only, not the entire union
                         return hasExcessProperties(source, discriminant, /*discriminant*/ undefined, reportErrors);
                     }
-                    var _loop_6 = function (prop) {
+                    var _loop_4 = function (prop) {
                         if (!isKnownProperty(target, prop.escapedName, isComparingJsxAttributes)) {
                             if (reportErrors) {
                                 // We know *exactly* where things went wrong when comparing the types.
@@ -36434,7 +38851,7 @@ var ts;
                     };
                     for (var _i = 0, _a = getPropertiesOfObjectType(source); _i < _a.length; _i++) {
                         var prop = _a[_i];
-                        var state_3 = _loop_6(prop);
+                        var state_3 = _loop_4(prop);
                         if (typeof state_3 === "object")
                             return state_3.value;
                     }
@@ -36880,10 +39297,10 @@ var ts;
                 var modifiersRelated = relation === comparableRelation || (relation === identityRelation ? getMappedTypeModifiers(source) === getMappedTypeModifiers(target) :
                     getCombinedMappedTypeOptionality(source) <= getCombinedMappedTypeOptionality(target));
                 if (modifiersRelated) {
-                    var result_2;
-                    if (result_2 = isRelatedTo(getConstraintTypeFromMappedType(target), getConstraintTypeFromMappedType(source), reportErrors)) {
+                    var result_1;
+                    if (result_1 = isRelatedTo(getConstraintTypeFromMappedType(target), getConstraintTypeFromMappedType(source), reportErrors)) {
                         var mapper = createTypeMapper([getTypeParameterFromMappedType(source)], [getTypeParameterFromMappedType(target)]);
-                        return result_2 & isRelatedTo(instantiateType(getTemplateTypeFromMappedType(source), mapper), getTemplateTypeFromMappedType(target), reportErrors);
+                        return result_1 & isRelatedTo(instantiateType(getTemplateTypeFromMappedType(source), mapper), getTemplateTypeFromMappedType(target), reportErrors);
                     }
                 }
                 return 0 /* False */;
@@ -37576,7 +39993,7 @@ var ts;
         }
         function isLiteralType(type) {
             return type.flags & 16 /* Boolean */ ? true :
-                type.flags & 262144 /* Union */ ? type.flags & 512 /* EnumLiteral */ ? true : !ts.forEach(type.types, function (t) { return !isUnitType(t); }) :
+                type.flags & 262144 /* Union */ ? type.flags & 512 /* EnumLiteral */ ? true : ts.every(type.types, isUnitType) :
                     isUnitType(type);
         }
         function getBaseTypeOfLiteralType(type) {
@@ -37768,6 +40185,19 @@ var ts;
             return context.resolvedProperties;
         }
         function getWidenedProperty(prop, context) {
+            if (!(prop.flags & 4 /* Property */)) {
+                // Since get accessors already widen their return value there is no need to
+                // widen accessor based properties here.
+                return prop;
+            }
+            if (prop.flags & 67108864 /* JSContainer */) {
+                var node = prop.declarations && ts.first(prop.declarations);
+                var init = ts.getAssignedJavascriptInitializer(node);
+                if (init && init.kind !== 184 /* ObjectLiteralExpression */) {
+                    // for JS special declarations, the only kind of initializer that will widen is object literals
+                    return prop;
+                }
+            }
             var original = getTypeOfSymbol(prop);
             var propContext = context && createWideningContext(context, prop.escapedName, /*siblings*/ undefined);
             var widened = getWidenedTypeWithContext(original, propContext);
@@ -37787,9 +40217,7 @@ var ts;
             var members = ts.createSymbolTable();
             for (var _i = 0, _a = getPropertiesOfObjectType(type); _i < _a.length; _i++) {
                 var prop = _a[_i];
-                // Since get accessors already widen their return value there is no need to
-                // widen accessor based properties here.
-                members.set(prop.escapedName, prop.flags & 4 /* Property */ ? getWidenedProperty(prop, context) : prop);
+                members.set(prop.escapedName, getWidenedProperty(prop, context));
             }
             if (context) {
                 for (var _b = 0, _c = getPropertiesOfContext(context); _b < _c.length; _b++) {
@@ -41295,10 +43723,10 @@ var ts;
                 var decl = ts.getDeclarationOfJSInitializer(node);
                 if (decl) {
                     // a JS object literal whose declaration's symbol has exports is a JS namespace
-                    var symbol = getMergedSymbol(decl.symbol);
+                    var symbol = getSymbolOfNode(decl);
                     if (symbol && ts.hasEntries(symbol.exports)) {
                         propertiesTable = symbol.exports;
-                        symbol.exports.forEach(function (symbol) { return propertiesArray.push(getMergedSymbol(symbol)); });
+                        symbol.exports.forEach(function (s) { return propertiesArray.push(getMergedSymbol(s)); });
                         return createObjectLiteralType();
                     }
                 }
@@ -41453,7 +43881,7 @@ var ts;
             return !!(type.flags & (3 /* AnyOrUnknown */ | 16777216 /* NonPrimitive */) ||
                 getFalsyFlags(type) & 29120 /* DefinitelyFalsy */ && isValidSpreadType(removeDefinitelyFalsyTypes(type)) ||
                 type.flags & 131072 /* Object */ && !isGenericMappedType(type) ||
-                type.flags & 786432 /* UnionOrIntersection */ && !ts.forEach(type.types, function (t) { return !isValidSpreadType(t); }));
+                type.flags & 786432 /* UnionOrIntersection */ && ts.every(type.types, isValidSpreadType));
         }
         function checkJsxSelfClosingElement(node, checkMode) {
             checkJsxOpeningLikeElementOrOpeningFragment(node, checkMode);
@@ -42199,7 +44627,7 @@ var ts;
                 // Assignability failure - check each prop individually, and if that fails, fall back on the bad error span
                 if (ts.length(openingLikeElement.attributes.properties)) {
                     var reportedError = false;
-                    var _loop_7 = function (prop) {
+                    var _loop_5 = function (prop) {
                         if (ts.isJsxSpreadAttribute(prop))
                             return "continue";
                         var name = ts.idText(prop.name);
@@ -42213,7 +44641,7 @@ var ts;
                     };
                     for (var _b = 0, _c = openingLikeElement.attributes.properties; _b < _c.length; _b++) {
                         var prop = _c[_b];
-                        _loop_7(prop);
+                        _loop_5(prop);
                     }
                     if (reportedError) {
                         return;
@@ -42574,84 +45002,11 @@ var ts;
          *         and 1 insertion/deletion at 3 characters)
          */
         function getSpellingSuggestionForName(name, symbols, meaning) {
-            var maximumLengthDifference = Math.min(2, Math.floor(name.length * 0.34));
-            var bestDistance = Math.floor(name.length * 0.4) + 1; // If the best result isn't better than this, don't bother.
-            var bestCandidate;
-            var justCheckExactMatches = false;
-            var nameLowerCase = name.toLowerCase();
-            for (var _i = 0, symbols_3 = symbols; _i < symbols_3.length; _i++) {
-                var candidate = symbols_3[_i];
+            return ts.getSpellingSuggestion(name, symbols, getCandidateName);
+            function getCandidateName(candidate) {
                 var candidateName = ts.symbolName(candidate);
-                if (candidateName.charCodeAt(0) === 34 /* doubleQuote */
-                    || !(candidate.flags & meaning && Math.abs(candidateName.length - nameLowerCase.length) <= maximumLengthDifference)) {
-                    continue;
-                }
-                var candidateNameLowerCase = candidateName.toLowerCase();
-                if (candidateNameLowerCase === nameLowerCase) {
-                    return candidate;
-                }
-                if (justCheckExactMatches) {
-                    continue;
-                }
-                if (candidateName.length < 3) {
-                    // Don't bother, user would have noticed a 2-character name having an extra character
-                    continue;
-                }
-                // Only care about a result better than the best so far.
-                var distance = levenshteinWithMax(nameLowerCase, candidateNameLowerCase, bestDistance - 1);
-                if (distance === undefined) {
-                    continue;
-                }
-                if (distance < 3) {
-                    justCheckExactMatches = true;
-                    bestCandidate = candidate;
-                }
-                else {
-                    ts.Debug.assert(distance < bestDistance); // Else `levenshteinWithMax` should return undefined
-                    bestDistance = distance;
-                    bestCandidate = candidate;
-                }
+                return !ts.startsWith(candidateName, "\"") && candidate.flags & meaning ? candidateName : undefined;
             }
-            return bestCandidate;
-        }
-        function levenshteinWithMax(s1, s2, max) {
-            var previous = new Array(s2.length + 1);
-            var current = new Array(s2.length + 1);
-            /** Represents any value > max. We don't care about the particular value. */
-            var big = max + 1;
-            for (var i = 0; i <= s2.length; i++) {
-                previous[i] = i;
-            }
-            for (var i = 1; i <= s1.length; i++) {
-                var c1 = s1.charCodeAt(i - 1);
-                var minJ = i > max ? i - max : 1;
-                var maxJ = s2.length > max + i ? max + i : s2.length;
-                current[0] = i;
-                /** Smallest value of the matrix in the ith column. */
-                var colMin = i;
-                for (var j = 1; j < minJ; j++) {
-                    current[j] = big;
-                }
-                for (var j = minJ; j <= maxJ; j++) {
-                    var dist = c1 === s2.charCodeAt(j - 1)
-                        ? previous[j - 1]
-                        : Math.min(/*delete*/ previous[j] + 1, /*insert*/ current[j - 1] + 1, /*substitute*/ previous[j - 1] + 2);
-                    current[j] = dist;
-                    colMin = Math.min(colMin, dist);
-                }
-                for (var j = maxJ + 1; j <= s2.length; j++) {
-                    current[j] = big;
-                }
-                if (colMin > max) {
-                    // Give up -- everything in this column is > max and it can't get better in future columns.
-                    return undefined;
-                }
-                var temp = previous;
-                previous = current;
-                current = temp;
-            }
-            var res = previous[s2.length];
-            return res > max ? undefined : res;
         }
         function markPropertyAsReferenced(prop, nodeForCheckWriteOnly, isThisAccess) {
             if (!prop || !(prop.flags & 106500 /* ClassMember */) || !prop.valueDeclaration || !ts.hasModifier(prop.valueDeclaration, 8 /* Private */)) {
@@ -43208,13 +45563,13 @@ var ts;
         function getEffectiveCallArguments(node) {
             if (node.kind === 189 /* TaggedTemplateExpression */) {
                 var template = node.template;
-                var args_4 = [undefined]; // TODO: GH#18217
+                var args_1 = [undefined]; // TODO: GH#18217
                 if (template.kind === 202 /* TemplateExpression */) {
                     ts.forEach(template.templateSpans, function (span) {
-                        args_4.push(span.expression);
+                        args_1.push(span.expression);
                     });
                 }
-                return args_4;
+                return args_1;
             }
             else if (node.kind === 150 /* Decorator */) {
                 // For a decorator, we return undefined as we will determine
@@ -43740,7 +46095,7 @@ var ts;
             if (node.expression.kind === 97 /* SuperKeyword */) {
                 var superType = checkSuperExpression(node.expression);
                 if (isTypeAny(superType)) {
-                    ts.forEach(node.arguments, checkExpression); // Still visit arguments so they get marked for visibility, etc
+                    ts.forEach(node.arguments, checkExpresionNoReturn); // Still visit arguments so they get marked for visibility, etc
                     return anySignature;
                 }
                 if (superType !== errorType) {
@@ -44254,8 +46609,8 @@ var ts;
             if (allowSyntheticDefaultImports && type && type !== errorType) {
                 var synthType = type;
                 if (!synthType.syntheticType) {
-                    var file_4 = ts.find(originalSymbol.declarations, ts.isSourceFile);
-                    var hasSyntheticDefault = canHaveSyntheticDefault(file_4, originalSymbol, /*dontResolveAlias*/ false);
+                    var file = ts.find(originalSymbol.declarations, ts.isSourceFile);
+                    var hasSyntheticDefault = canHaveSyntheticDefault(file, originalSymbol, /*dontResolveAlias*/ false);
                     if (hasSyntheticDefault) {
                         var memberTable = ts.createSymbolTable();
                         var newSymbol = createSymbol(2097152 /* Alias */, "default" /* Default */);
@@ -45020,7 +47375,6 @@ var ts;
         }
         function checkObjectLiteralAssignment(node, sourceType) {
             var properties = node.properties;
-            checkGrammarForDisallowedTrailingComma(properties, ts.Diagnostics.A_rest_parameter_or_binding_pattern_may_not_have_a_trailing_comma);
             if (strictNullChecks && properties.length === 0) {
                 return checkNonNullType(sourceType, node);
             }
@@ -45070,6 +47424,7 @@ var ts;
                     }
                 }
                 var type = getRestType(objectLiteralType, nonRestNames, objectLiteralType.symbol);
+                checkGrammarForDisallowedTrailingComma(allProperties, ts.Diagnostics.A_rest_parameter_or_binding_pattern_may_not_have_a_trailing_comma);
                 return checkDestructuringAssignment(property.expression, type);
             }
             else {
@@ -45078,7 +47433,6 @@ var ts;
         }
         function checkArrayLiteralAssignment(node, sourceType, checkMode) {
             var elements = node.elements;
-            checkGrammarForDisallowedTrailingComma(elements, ts.Diagnostics.A_rest_parameter_or_binding_pattern_may_not_have_a_trailing_comma);
             if (languageVersion < 2 /* ES2015 */ && compilerOptions.downlevelIteration) {
                 checkExternalEmitHelpers(node, 512 /* Read */);
             }
@@ -45127,6 +47481,7 @@ var ts;
                             error(restExpression.operatorToken, ts.Diagnostics.A_rest_element_cannot_have_an_initializer);
                         }
                         else {
+                            checkGrammarForDisallowedTrailingComma(node.elements, ts.Diagnostics.A_rest_parameter_or_binding_pattern_may_not_have_a_trailing_comma);
                             return checkDestructuringAssignment(restExpression, createArrayType(elementType), checkMode);
                         }
                     }
@@ -45392,7 +47747,7 @@ var ts;
                         if (propType.symbol && propType.symbol.flags & 32 /* Class */) {
                             var name = prop.escapedName;
                             var symbol = resolveName(prop.valueDeclaration, name, 67901928 /* Type */, undefined, name, /*isUse*/ false);
-                            if (symbol && symbol.declarations.some(function (d) { return d.kind === 297 /* JSDocTypedefTag */; })) {
+                            if (symbol && symbol.declarations.some(ts.isJSDocTypedefTag)) {
                                 grammarErrorOnNode(symbol.declarations[0], ts.Diagnostics.Duplicate_identifier_0, ts.unescapeLeadingUnderscores(name));
                                 return grammarErrorOnNode(prop.valueDeclaration, ts.Diagnostics.Duplicate_identifier_0, ts.unescapeLeadingUnderscores(name));
                             }
@@ -45691,6 +48046,9 @@ var ts;
             node.contextualType = saveContextualType;
             return type;
         }
+        function checkExpresionNoReturn(node) {
+            checkExpression(node);
+        }
         // Checks an expression and returns its type. The contextualMapper parameter serves two purposes: When
         // contextualMapper is not undefined and not equal to the identityMapper function object it indicates that the
         // expression is being inferentially typed (section 4.15.2 in spec) and provides the type mapper to use in
@@ -46623,8 +48981,8 @@ var ts;
             }
             var duplicateFunctionDeclaration = false;
             var multipleConstructorImplementation = false;
-            for (var _i = 0, declarations_4 = declarations; _i < declarations_4.length; _i++) {
-                var current = declarations_4[_i];
+            for (var _i = 0, declarations_3 = declarations; _i < declarations_3.length; _i++) {
+                var current = declarations_3[_i];
                 var node = current;
                 var inAmbientContext = node.flags & 4194304 /* Ambient */;
                 var inAmbientContextOrInterface = node.parent.kind === 236 /* InterfaceDeclaration */ || node.parent.kind === 166 /* TypeLiteral */ || inAmbientContext;
@@ -46793,10 +49151,10 @@ var ts;
                     case 243 /* ImportEqualsDeclaration */:
                     case 246 /* NamespaceImport */:
                     case 245 /* ImportClause */:
-                        var result_3 = 0 /* None */;
+                        var result_2 = 0 /* None */;
                         var target = resolveAlias(getSymbolOfNode(d));
-                        ts.forEach(target.declarations, function (d) { result_3 |= getDeclarationSpaces(d); });
-                        return result_3;
+                        ts.forEach(target.declarations, function (d) { result_2 |= getDeclarationSpaces(d); });
+                        return result_2;
                     case 232 /* VariableDeclaration */:
                     case 182 /* BindingElement */:
                     case 234 /* FunctionDeclaration */:
@@ -47593,8 +49951,8 @@ var ts;
                         : ts.createDiagnosticForNode(declarationList.parent.kind === 214 /* VariableStatement */ ? declarationList.parent : declarationList, ts.Diagnostics.All_variables_are_unused));
                 }
                 else {
-                    for (var _i = 0, declarations_5 = declarations; _i < declarations_5.length; _i++) {
-                        var decl = declarations_5[_i];
+                    for (var _i = 0, declarations_4 = declarations; _i < declarations_4.length; _i++) {
+                        var decl = declarations_4[_i];
                         addDiagnostic(0 /* Local */, ts.createDiagnosticForNode(decl, ts.Diagnostics._0_is_declared_but_its_value_is_never_read, ts.idText(ts.cast(decl.name, ts.isIdentifier))));
                     }
                 }
@@ -48778,8 +51136,8 @@ var ts;
                 if (!areTypeParametersIdentical(declarations, type.localTypeParameters)) {
                     // Report an error on every conflicting declaration.
                     var name = symbolToString(symbol);
-                    for (var _i = 0, declarations_6 = declarations; _i < declarations_6.length; _i++) {
-                        var declaration = declarations_6[_i];
+                    for (var _i = 0, declarations_5 = declarations; _i < declarations_5.length; _i++) {
+                        var declaration = declarations_5[_i];
                         error(declaration.name, ts.Diagnostics.All_declarations_of_0_must_have_identical_type_parameters, name);
                     }
                 }
@@ -48788,8 +51146,8 @@ var ts;
         function areTypeParametersIdentical(declarations, targetParameters) {
             var maxTypeArgumentCount = ts.length(targetParameters);
             var minTypeArgumentCount = getMinTypeArgumentCount(targetParameters);
-            for (var _i = 0, declarations_7 = declarations; _i < declarations_7.length; _i++) {
-                var declaration = declarations_7[_i];
+            for (var _i = 0, declarations_6 = declarations; _i < declarations_6.length; _i++) {
+                var declaration = declarations_6[_i];
                 // If this declaration has too few or too many type parameters, we report an error
                 var sourceParameters = ts.getEffectiveTypeParameterDeclarations(declaration);
                 var numTypeParameters = sourceParameters.length;
@@ -48943,7 +51301,7 @@ var ts;
         function issueMemberSpecificError(node, typeWithThis, baseWithThis, broadDiag) {
             // iterate over all implemented properties and issue errors on each one which isn't compatible, rather than the class as a whole, if possible
             var issuedMemberError = false;
-            var _loop_8 = function (member) {
+            var _loop_6 = function (member) {
                 if (ts.hasStaticModifier(member)) {
                     return "continue";
                 }
@@ -48962,7 +51320,7 @@ var ts;
             };
             for (var _i = 0, _a = node.members; _i < _a.length; _i++) {
                 var member = _a[_i];
-                _loop_8(member);
+                _loop_6(member);
             }
             if (!issuedMemberError) {
                 // check again with diagnostics to generate a less-specific error
@@ -49247,12 +51605,12 @@ var ts;
             function evaluate(expr) {
                 switch (expr.kind) {
                     case 198 /* PrefixUnaryExpression */:
-                        var value_2 = evaluate(expr.operand);
-                        if (typeof value_2 === "number") {
+                        var value_1 = evaluate(expr.operand);
+                        if (typeof value_1 === "number") {
                             switch (expr.operator) {
-                                case 37 /* PlusToken */: return value_2;
-                                case 38 /* MinusToken */: return -value_2;
-                                case 52 /* TildeToken */: return ~value_2;
+                                case 37 /* PlusToken */: return value_1;
+                                case 38 /* MinusToken */: return -value_1;
+                                case 52 /* TildeToken */: return ~value_1;
                             }
                         }
                         break;
@@ -49391,8 +51749,8 @@ var ts;
         }
         function getFirstNonAmbientClassOrFunctionDeclaration(symbol) {
             var declarations = symbol.declarations;
-            for (var _i = 0, declarations_8 = declarations; _i < declarations_8.length; _i++) {
-                var declaration = declarations_8[_i];
+            for (var _i = 0, declarations_7 = declarations; _i < declarations_7.length; _i++) {
+                var declaration = declarations_7[_i];
                 if ((declaration.kind === 235 /* ClassDeclaration */ ||
                     (declaration.kind === 234 /* FunctionDeclaration */ && ts.nodeIsPresent(declaration.body))) &&
                     !(declaration.flags & 4194304 /* Ambient */)) {
@@ -49815,9 +52173,9 @@ var ts;
                     }
                 }
                 // Checks for export * conflicts
-                var exports_1 = getExportsOfModule(moduleSymbol);
-                if (exports_1) {
-                    exports_1.forEach(function (_a, id) {
+                var exports = getExportsOfModule(moduleSymbol);
+                if (exports) {
+                    exports.forEach(function (_a, id) {
                         var declarations = _a.declarations, flags = _a.flags;
                         if (id === "__export") {
                             return;
@@ -49834,8 +52192,8 @@ var ts;
                             return;
                         }
                         if (exportedDeclarationsCount > 1) {
-                            for (var _i = 0, declarations_9 = declarations; _i < declarations_9.length; _i++) {
-                                var declaration = declarations_9[_i];
+                            for (var _i = 0, declarations_8 = declarations; _i < declarations_8.length; _i++) {
+                                var declaration = declarations_8[_i];
                                 if (isNotOverload(declaration)) {
                                     diagnostics.add(ts.createDiagnosticForNode(declaration, ts.Diagnostics.Cannot_redeclare_exported_variable_0, ts.unescapeLeadingUnderscores(id)));
                                 }
@@ -51300,8 +53658,8 @@ var ts;
                     var decl = _a[_i];
                     // check meaning of the local symbol to see if declaration needs to be analyzed further
                     if (decl.symbol && decl.symbol.flags & meaning) {
-                        var file_5 = ts.getSourceFileOfNode(decl);
-                        var typeReferenceDirective = fileToDirective.get(file_5.path);
+                        var file = ts.getSourceFileOfNode(decl);
+                        var typeReferenceDirective = fileToDirective.get(file.path);
                         if (typeReferenceDirective) {
                             (typeReferenceDirectives || (typeReferenceDirectives = [])).push(typeReferenceDirective);
                         }
@@ -51336,8 +53694,8 @@ var ts;
                 // check that at least one declaration of top level symbol originates from type declaration file
                 for (var _i = 0, _a = symbol.declarations; _i < _a.length; _i++) {
                     var decl = _a[_i];
-                    var file_6 = ts.getSourceFileOfNode(decl);
-                    if (fileToDirective.has(file_6.path)) {
+                    var file = ts.getSourceFileOfNode(decl);
+                    if (fileToDirective.has(file.path)) {
                         return true;
                     }
                 }
@@ -51355,25 +53713,25 @@ var ts;
         function initializeTypeChecker() {
             // Bind all source files and propagate errors
             for (var _i = 0, _a = host.getSourceFiles(); _i < _a.length; _i++) {
-                var file_7 = _a[_i];
-                ts.bindSourceFile(file_7, compilerOptions);
+                var file = _a[_i];
+                ts.bindSourceFile(file, compilerOptions);
             }
             // Initialize global symbol table
             var augmentations;
             for (var _b = 0, _c = host.getSourceFiles(); _b < _c.length; _b++) {
-                var file_8 = _c[_b];
-                if (!ts.isExternalOrCommonJsModule(file_8)) {
-                    mergeSymbolTable(globals, file_8.locals);
+                var file = _c[_b];
+                if (!ts.isExternalOrCommonJsModule(file)) {
+                    mergeSymbolTable(globals, file.locals);
                 }
-                if (file_8.patternAmbientModules && file_8.patternAmbientModules.length) {
-                    patternAmbientModules = ts.concatenate(patternAmbientModules, file_8.patternAmbientModules);
+                if (file.patternAmbientModules && file.patternAmbientModules.length) {
+                    patternAmbientModules = ts.concatenate(patternAmbientModules, file.patternAmbientModules);
                 }
-                if (file_8.moduleAugmentations.length) {
-                    (augmentations || (augmentations = [])).push(file_8.moduleAugmentations);
+                if (file.moduleAugmentations.length) {
+                    (augmentations || (augmentations = [])).push(file.moduleAugmentations);
                 }
-                if (file_8.symbol && file_8.symbol.globalExports) {
+                if (file.symbol && file.symbol.globalExports) {
                     // Merge in UMD exports with first-in-wins semantics (see #9771)
-                    var source = file_8.symbol.globalExports;
+                    var source = file.symbol.globalExports;
                     source.forEach(function (sourceSymbol, id) {
                         if (!globals.has(id)) {
                             globals.set(id, sourceSymbol);
@@ -51898,8 +54256,8 @@ var ts;
         }
         function checkGrammarForOmittedArgument(args) {
             if (args) {
-                for (var _i = 0, args_5 = args; _i < args_5.length; _i++) {
-                    var arg = args_5[_i];
+                for (var _i = 0, args_2 = args; _i < args_2.length; _i++) {
+                    var arg = args_2[_i];
                     if (arg.kind === 206 /* OmittedExpression */) {
                         return grammarErrorAtPos(arg, arg.pos, 0, ts.Diagnostics.Argument_expression_expected);
                     }
@@ -54885,11 +57243,12 @@ var ts;
     }
     ts.updateEnumMember = updateEnumMember;
     // Top-level nodes
-    function updateSourceFileNode(node, statements, isDeclarationFile, referencedFiles, typeReferences, hasNoDefaultLib) {
+    function updateSourceFileNode(node, statements, isDeclarationFile, referencedFiles, typeReferences, hasNoDefaultLib, libReferences) {
         if (node.statements !== statements ||
             (isDeclarationFile !== undefined && node.isDeclarationFile !== isDeclarationFile) ||
             (referencedFiles !== undefined && node.referencedFiles !== referencedFiles) ||
             (typeReferences !== undefined && node.typeReferenceDirectives !== typeReferences) ||
+            (libReferences !== undefined && node.libReferenceDirectives !== libReferences) ||
             (hasNoDefaultLib !== undefined && node.hasNoDefaultLib !== hasNoDefaultLib)) {
             var updated = createSynthesizedNode(274 /* SourceFile */);
             updated.flags |= node.flags;
@@ -54902,6 +57261,7 @@ var ts;
             updated.referencedFiles = referencedFiles === undefined ? node.referencedFiles : referencedFiles;
             updated.typeReferenceDirectives = typeReferences === undefined ? node.typeReferenceDirectives : typeReferences;
             updated.hasNoDefaultLib = hasNoDefaultLib === undefined ? node.hasNoDefaultLib : hasNoDefaultLib;
+            updated.libReferenceDirectives = libReferences === undefined ? node.libReferenceDirectives : libReferences;
             if (node.amdDependencies !== undefined)
                 updated.amdDependencies = node.amdDependencies;
             if (node.moduleName !== undefined)
@@ -55058,16 +57418,19 @@ var ts;
         return node;
     }
     ts.createBundle = createBundle;
-    function createUnparsedSourceFile(text) {
+    function createUnparsedSourceFile(text, map) {
         var node = ts.createNode(276 /* UnparsedSource */);
         node.text = text;
+        node.sourceMapText = map;
         return node;
     }
     ts.createUnparsedSourceFile = createUnparsedSourceFile;
-    function createInputFiles(javascript, declaration) {
+    function createInputFiles(javascript, declaration, javascriptMapText, declarationMapText) {
         var node = ts.createNode(277 /* InputFiles */);
         node.javascriptText = javascript;
+        node.javascriptMapText = javascriptMapText;
         node.declarationText = declaration;
+        node.declarationMapText = declarationMapText;
         return node;
     }
     ts.createInputFiles = createInputFiles;
@@ -57865,8 +60228,8 @@ var ts;
         }
         var subtreeFlags = 0 /* None */;
         var nodeArrayFlags = 0 /* None */;
-        for (var _i = 0, nodes_3 = nodes; _i < nodes_3.length; _i++) {
-            var node = nodes_3[_i];
+        for (var _i = 0, nodes_2 = nodes; _i < nodes_2.length; _i++) {
+            var node = nodes_2[_i];
             subtreeFlags |= aggregateTransformFlagsForNode(node);
             nodeArrayFlags |= node.transformFlags & ~536870912 /* HasComputedFlags */;
         }
@@ -58762,7 +61125,7 @@ var ts;
         function transformBundle(node) {
             return ts.createBundle(node.sourceFiles.map(transformSourceFile), ts.mapDefined(node.prepends, function (prepend) {
                 if (prepend.kind === 277 /* InputFiles */) {
-                    return ts.createUnparsedSourceFile(prepend.javascriptText);
+                    return ts.createUnparsedSourceFile(prepend.javascriptText, prepend.javascriptMapText);
                 }
                 return prepend;
             }));
@@ -59931,8 +62294,8 @@ var ts;
         function generateClassElementDecorationExpressions(node, isStatic) {
             var members = getDecoratedClassElements(node, isStatic);
             var expressions;
-            for (var _i = 0, members_5 = members; _i < members_5.length; _i++) {
-                var member = members_5[_i];
+            for (var _i = 0, members_4 = members; _i < members_4.length; _i++) {
+                var member = members_4[_i];
                 var expression = generateClassElementDecorationExpression(node, member);
                 if (expression) {
                     if (!expressions) {
@@ -60295,6 +62658,7 @@ var ts;
                 case 119 /* AnyKeyword */:
                 case 142 /* UnknownKeyword */:
                 case 174 /* ThisType */:
+                case 179 /* ImportType */:
                     break;
                 default:
                     return ts.Debug.failBadSyntaxKind(node);
@@ -64623,6 +66987,7 @@ var ts;
             var singleLine = false; // indicates whether the block *may* be emitted as a single line
             var statementsLocation;
             var closeBraceLocation;
+            var leadingStatements = [];
             var statements = [];
             var body = node.body;
             var statementOffset;
@@ -64630,18 +66995,14 @@ var ts;
             if (ts.isBlock(body)) {
                 // ensureUseStrict is false because no new prologue-directive should be added.
                 // addStandardPrologue will put already-existing directives at the beginning of the target statement-array
-                statementOffset = ts.addStandardPrologue(statements, body.statements, /*ensureUseStrict*/ false);
-            }
-            addCaptureThisForNodeIfNeeded(statements, node);
-            addDefaultValueAssignmentsIfNeeded(statements, node);
-            addRestParameterIfNeeded(statements, node, /*inConstructorWithSynthesizedSuper*/ false);
-            // If we added any generated statements, this must be a multi-line block.
-            if (!multiLine && statements.length > 0) {
-                multiLine = true;
+                statementOffset = ts.addStandardPrologue(leadingStatements, body.statements, /*ensureUseStrict*/ false);
             }
+            addCaptureThisForNodeIfNeeded(leadingStatements, node);
+            addDefaultValueAssignmentsIfNeeded(leadingStatements, node);
+            addRestParameterIfNeeded(leadingStatements, node, /*inConstructorWithSynthesizedSuper*/ false);
             if (ts.isBlock(body)) {
                 // addCustomPrologue puts already-existing directives at the beginning of the target statement-array
-                statementOffset = ts.addCustomPrologue(statements, body.statements, statementOffset, visitor);
+                statementOffset = ts.addCustomPrologue(leadingStatements, body.statements, statementOffset, visitor);
                 statementsLocation = body.statements;
                 ts.addRange(statements, ts.visitNodes(body.statements, visitor, ts.isStatement, statementOffset));
                 // If the original body was a multi-line block, this must be a multi-line block.
@@ -64679,10 +67040,10 @@ var ts;
             ts.prependStatements(statements, lexicalEnvironment);
             prependCaptureNewTargetIfNeeded(statements, node, /*copyOnWrite*/ false);
             // If we added any final generated statements, this must be a multi-line block
-            if (!multiLine && lexicalEnvironment && lexicalEnvironment.length) {
+            if (ts.some(leadingStatements) || ts.some(lexicalEnvironment)) {
                 multiLine = true;
             }
-            var block = ts.createBlock(ts.setTextRange(ts.createNodeArray(statements), statementsLocation), multiLine);
+            var block = ts.createBlock(ts.setTextRange(ts.createNodeArray(leadingStatements.concat(statements)), statementsLocation), multiLine);
             ts.setTextRange(block, node.body);
             if (!multiLine && singleLine) {
                 ts.setEmitFlags(block, 1 /* SingleLine */);
@@ -72476,8 +74837,8 @@ var ts;
                 return;
             }
             necessaryTypeRefernces = necessaryTypeRefernces || ts.createMap();
-            for (var _i = 0, typeReferenceDirectives_2 = typeReferenceDirectives; _i < typeReferenceDirectives_2.length; _i++) {
-                var ref = typeReferenceDirectives_2[_i];
+            for (var _i = 0, typeReferenceDirectives_1 = typeReferenceDirectives; _i < typeReferenceDirectives_1.length; _i++) {
+                var ref = typeReferenceDirectives_1[_i];
                 necessaryTypeRefernces.set(ref, true);
             }
         }
@@ -72560,15 +74921,15 @@ var ts;
                         resultHasExternalModuleIndicator = false; // unused in external module bundle emit (all external modules are within module blocks, therefore are known to be modules)
                         needsDeclare = false;
                         var statements_5 = ts.visitNodes(sourceFile.statements, visitDeclarationStatements);
-                        var newFile = ts.updateSourceFileNode(sourceFile, [ts.createModuleDeclaration([], [ts.createModifier(124 /* DeclareKeyword */)], ts.createLiteral(ts.getResolvedExternalModuleName(context.getEmitHost(), sourceFile)), ts.createModuleBlock(ts.setTextRange(ts.createNodeArray(transformAndReplaceLatePaintedStatements(statements_5)), sourceFile.statements)))], /*isDeclarationFile*/ true, /*referencedFiles*/ [], /*typeReferences*/ [], /*hasNoDefaultLib*/ false);
+                        var newFile = ts.updateSourceFileNode(sourceFile, [ts.createModuleDeclaration([], [ts.createModifier(124 /* DeclareKeyword */)], ts.createLiteral(ts.getResolvedExternalModuleName(context.getEmitHost(), sourceFile)), ts.createModuleBlock(ts.setTextRange(ts.createNodeArray(transformAndReplaceLatePaintedStatements(statements_5)), sourceFile.statements)))], /*isDeclarationFile*/ true, /*referencedFiles*/ [], /*typeReferences*/ [], /*hasNoDefaultLib*/ false, /*libReferences*/ []);
                         return newFile;
                     }
                     needsDeclare = true;
                     var updated = ts.visitNodes(sourceFile.statements, visitDeclarationStatements);
-                    return ts.updateSourceFileNode(sourceFile, transformAndReplaceLatePaintedStatements(updated), /*isDeclarationFile*/ true, /*referencedFiles*/ [], /*typeReferences*/ [], /*hasNoDefaultLib*/ false);
+                    return ts.updateSourceFileNode(sourceFile, transformAndReplaceLatePaintedStatements(updated), /*isDeclarationFile*/ true, /*referencedFiles*/ [], /*typeReferences*/ [], /*hasNoDefaultLib*/ false, /*libReferences*/ []);
                 }), ts.mapDefined(node.prepends, function (prepend) {
                     if (prepend.kind === 277 /* InputFiles */) {
-                        return ts.createUnparsedSourceFile(prepend.declarationText);
+                        return ts.createUnparsedSourceFile(prepend.declarationText, prepend.declarationMapText);
                     }
                 }));
                 bundle.syntheticFileReferences = [];
@@ -73385,7 +75746,7 @@ var ts;
             var prop = ts.createProperty(/*decorators*/ undefined, maskModifiers(node, /*mask*/ undefined, (!accessors.setAccessor) ? 64 /* Readonly */ : 0 /* None */), node.name, node.questionToken, ensureType(node, accessorType), /*initializer*/ undefined);
             var leadingsSyntheticCommentRanges = accessors.secondAccessor && ts.getLeadingCommentRangesOfNode(accessors.secondAccessor, currentSourceFile);
             if (leadingsSyntheticCommentRanges) {
-                var _loop_9 = function (range) {
+                var _loop_7 = function (range) {
                     if (range.kind === 3 /* MultiLineCommentTrivia */) {
                         var text = currentSourceFile.text.slice(range.pos + 2, range.end - 2);
                         var lines = text.split(/\r\n?|\n/g);
@@ -73399,7 +75760,7 @@ var ts;
                 };
                 for (var _i = 0, leadingsSyntheticCommentRanges_1 = leadingsSyntheticCommentRanges; _i < leadingsSyntheticCommentRanges_1.length; _i++) {
                     var range = leadingsSyntheticCommentRanges_1[_i];
-                    _loop_9(range);
+                    _loop_7(range);
                 }
             }
             return prop;
@@ -73608,8 +75969,8 @@ var ts;
             }
         };
         // Ensure the parse tree is clean before applying transformations
-        for (var _i = 0, nodes_4 = nodes; _i < nodes_4.length; _i++) {
-            var node = nodes_4[_i];
+        for (var _i = 0, nodes_3 = nodes; _i < nodes_3.length; _i++) {
+            var node = nodes_3[_i];
             ts.disposeEmitNodes(ts.getSourceFileOfNode(ts.getParseTreeNode(node)));
         }
         ts.performance.mark("beforeTransform");
@@ -73800,8 +76161,8 @@ var ts;
         function dispose() {
             if (state < 3 /* Disposed */) {
                 // Clean up emit nodes on parse tree
-                for (var _i = 0, nodes_5 = nodes; _i < nodes_5.length; _i++) {
-                    var node = nodes_5[_i];
+                for (var _i = 0, nodes_4 = nodes; _i < nodes_4.length; _i++) {
+                    var node = nodes_4[_i];
                     ts.disposeEmitNodes(ts.getSourceFileOfNode(ts.getParseTreeNode(node)));
                 }
                 // Release references to external entries for GC purposes.
@@ -73846,6 +76207,9 @@ var ts;
         var sourceMapData;
         var sourceMapDataList;
         var disabled = !(compilerOptions.sourceMap || compilerOptions.inlineSourceMap);
+        var completedSections;
+        var sectionStartLine;
+        var sectionStartColumn;
         return {
             initialize: initialize,
             reset: reset,
@@ -73886,6 +76250,9 @@ var ts;
             lastEncodedSourceMapSpan = defaultLastEncodedSourceMapSpan;
             lastEncodedNameIndex = 0;
             // Initialize source map data
+            completedSections = [];
+            sectionStartLine = 1;
+            sectionStartColumn = 1;
             sourceMapData = {
                 sourceMapFilePath: sourceMapFilePath,
                 jsSourceMappingURL: !compilerOptions.inlineSourceMap ? ts.getBaseFileName(ts.normalizeSlashes(sourceMapFilePath)) : undefined,
@@ -73946,6 +76313,39 @@ var ts;
             lastEncodedNameIndex = undefined;
             sourceMapData = undefined;
             sourceMapDataList = undefined;
+            completedSections = undefined;
+            sectionStartLine = undefined;
+            sectionStartColumn = undefined;
+        }
+        function captureSection() {
+            return {
+                version: 3,
+                file: sourceMapData.sourceMapFile,
+                sourceRoot: sourceMapData.sourceMapSourceRoot,
+                sources: sourceMapData.sourceMapSources,
+                names: sourceMapData.sourceMapNames,
+                mappings: sourceMapData.sourceMapMappings,
+                sourcesContent: sourceMapData.sourceMapSourcesContent,
+            };
+        }
+        function resetSectionalData() {
+            sourceMapData.sourceMapSources = [];
+            sourceMapData.sourceMapNames = [];
+            sourceMapData.sourceMapMappings = "";
+            sourceMapData.sourceMapSourcesContent = compilerOptions.inlineSources ? [] : undefined;
+        }
+        function generateMap() {
+            if (completedSections.length) {
+                captureSectionalSpanIfNeeded(/*reset*/ false);
+                return {
+                    version: 3,
+                    file: sourceMapData.sourceMapFile,
+                    sections: completedSections
+                };
+            }
+            else {
+                return captureSection();
+            }
         }
         // Encoding for sourcemap span
         function encodeLastRecordedSourceMapSpan() {
@@ -74003,8 +76403,8 @@ var ts;
             // Convert the location to be one-based.
             sourceLinePos.line++;
             sourceLinePos.character++;
-            var emittedLine = writer.getLine();
-            var emittedColumn = writer.getColumn();
+            var emittedLine = writer.getLine() - sectionStartLine + 1;
+            var emittedColumn = emittedLine === 0 ? (writer.getColumn() - sectionStartColumn + 1) : writer.getColumn();
             // If this location wasn't recorded or the location in source is going backwards, record the span
             if (!lastRecordedSourceMapSpan ||
                 lastRecordedSourceMapSpan.emittedLine !== emittedLine ||
@@ -74034,6 +76434,14 @@ var ts;
                 ts.performance.measure("Source Map", "beforeSourcemap", "afterSourcemap");
             }
         }
+        function captureSectionalSpanIfNeeded(reset) {
+            if (lastRecordedSourceMapSpan && lastRecordedSourceMapSpan === lastEncodedSourceMapSpan) { // If we've recorded some spans, save them
+                completedSections.push({ offset: { line: sectionStartLine - 1, column: sectionStartColumn - 1 }, map: captureSection() });
+                if (reset) {
+                    resetSectionalData();
+                }
+            }
+        }
         /**
          * Emits a node with possible leading and trailing source maps.
          *
@@ -74046,10 +76454,38 @@ var ts;
                 return emitCallback(hint, node);
             }
             if (node) {
+                if (ts.isUnparsedSource(node) && node.sourceMapText !== undefined) {
+                    captureSectionalSpanIfNeeded(/*reset*/ true);
+                    var text = node.sourceMapText;
+                    var parsed = void 0;
+                    try {
+                        parsed = JSON.parse(text);
+                    }
+                    catch (_a) {
+                        // empty
+                    }
+                    var offset = { line: writer.getLine() - 1, column: writer.getColumn() - 1 };
+                    completedSections.push(parsed
+                        ? {
+                            offset: offset,
+                            map: parsed
+                        }
+                        : {
+                            offset: offset,
+                            // This is just passes the buck on sourcemaps we don't really understand, instead of issuing an error (which would be difficult this late)
+                            url: "data:application/json;charset=utf-8;base64," + ts.base64encode(ts.sys, text)
+                        });
+                    var emitResult = emitCallback(hint, node);
+                    sectionStartLine = writer.getLine();
+                    sectionStartColumn = writer.getColumn();
+                    lastRecordedSourceMapSpan = undefined;
+                    lastEncodedSourceMapSpan = defaultLastEncodedSourceMapSpan;
+                    return emitResult;
+                }
                 var emitNode = node.emitNode;
                 var emitFlags = emitNode && emitNode.flags || 0 /* None */;
                 var range = emitNode && emitNode.sourceMapRange;
-                var _a = range || node, pos = _a.pos, end = _a.end;
+                var _b = range || node, pos = _b.pos, end = _b.end;
                 var source = range && range.source;
                 var oldSource = currentSource;
                 if (source === oldSource)
@@ -74151,15 +76587,7 @@ var ts;
                 return undefined; // TODO: GH#18217
             }
             encodeLastRecordedSourceMapSpan();
-            return JSON.stringify({
-                version: 3,
-                file: sourceMapData.sourceMapFile,
-                sourceRoot: sourceMapData.sourceMapSourceRoot,
-                sources: sourceMapData.sourceMapSources,
-                names: sourceMapData.sourceMapNames,
-                mappings: sourceMapData.sourceMapMappings,
-                sourcesContent: sourceMapData.sourceMapSourcesContent,
-            });
+            return JSON.stringify(generateMap());
         }
         /**
          * Gets the SourceMappingURL for the source map.
@@ -75489,7 +77917,7 @@ var ts;
         }
         // SyntaxKind.UnparsedSource
         function emitUnparsedSource(unparsed) {
-            write(unparsed.text);
+            writer.rawWrite(unparsed.text);
         }
         //
         // Identifiers
@@ -77290,8 +79718,8 @@ var ts;
         function writeLines(text) {
             var lines = text.split(/\r\n?|\n/g);
             var indentation = ts.guessIndentation(lines);
-            for (var _a = 0, lines_2 = lines; _a < lines_2.length; _a++) {
-                var lineText = lines_2[_a];
+            for (var _a = 0, lines_1 = lines; _a < lines_1.length; _a++) {
+                var lineText = lines_1[_a];
                 var line = indentation ? lineText.slice(indentation) : lineText;
                 if (line.length) {
                     writeLine();
@@ -78304,7 +80732,10 @@ var ts;
             getEnvironmentVariable: function (name) { return ts.sys.getEnvironmentVariable ? ts.sys.getEnvironmentVariable(name) : ""; },
             getDirectories: function (path) { return ts.sys.getDirectories(path); },
             realpath: realpath,
-            readDirectory: function (path, extensions, include, exclude, depth) { return ts.sys.readDirectory(path, extensions, include, exclude, depth); }
+            readDirectory: function (path, extensions, include, exclude, depth) { return ts.sys.readDirectory(path, extensions, include, exclude, depth); },
+            getModifiedTime: ts.sys.getModifiedTime && (function (path) { return ts.sys.getModifiedTime(path); }),
+            setModifiedTime: ts.sys.setModifiedTime && (function (path, date) { return ts.sys.setModifiedTime(path, date); }),
+            deleteFile: ts.sys.deleteFile && (function (path) { return ts.sys.deleteFile(path); })
         };
     }
     ts.createCompilerHost = createCompilerHost;
@@ -78372,52 +80803,52 @@ var ts;
         var output = "";
         for (var _i = 0, diagnostics_2 = diagnostics; _i < diagnostics_2.length; _i++) {
             var diagnostic = diagnostics_2[_i];
-            var context_2 = "";
+            var context = "";
             if (diagnostic.file) {
-                var start = diagnostic.start, length_4 = diagnostic.length, file_9 = diagnostic.file;
-                var _a = ts.getLineAndCharacterOfPosition(file_9, start), firstLine = _a.line, firstLineChar = _a.character; // TODO: GH#18217
-                var _b = ts.getLineAndCharacterOfPosition(file_9, start + length_4), lastLine = _b.line, lastLineChar = _b.character;
-                var lastLineInFile = ts.getLineAndCharacterOfPosition(file_9, file_9.text.length).line;
-                var relativeFileName = host ? ts.convertToRelativePath(file_9.fileName, host.getCurrentDirectory(), function (fileName) { return host.getCanonicalFileName(fileName); }) : file_9.fileName;
+                var start = diagnostic.start, length_4 = diagnostic.length, file = diagnostic.file;
+                var _a = ts.getLineAndCharacterOfPosition(file, start), firstLine = _a.line, firstLineChar = _a.character; // TODO: GH#18217
+                var _b = ts.getLineAndCharacterOfPosition(file, start + length_4), lastLine = _b.line, lastLineChar = _b.character;
+                var lastLineInFile = ts.getLineAndCharacterOfPosition(file, file.text.length).line;
+                var relativeFileName = host ? ts.convertToRelativePath(file.fileName, host.getCurrentDirectory(), function (fileName) { return host.getCanonicalFileName(fileName); }) : file.fileName;
                 var hasMoreThanFiveLines = (lastLine - firstLine) >= 4;
                 var gutterWidth = (lastLine + 1 + "").length;
                 if (hasMoreThanFiveLines) {
                     gutterWidth = Math.max(ellipsis.length, gutterWidth);
                 }
                 for (var i = firstLine; i <= lastLine; i++) {
-                    context_2 += host.getNewLine();
+                    context += host.getNewLine();
                     // If the error spans over 5 lines, we'll only show the first 2 and last 2 lines,
                     // so we'll skip ahead to the second-to-last line.
                     if (hasMoreThanFiveLines && firstLine + 1 < i && i < lastLine - 1) {
-                        context_2 += formatColorAndReset(padLeft(ellipsis, gutterWidth), gutterStyleSequence) + gutterSeparator + host.getNewLine();
+                        context += formatColorAndReset(padLeft(ellipsis, gutterWidth), gutterStyleSequence) + gutterSeparator + host.getNewLine();
                         i = lastLine - 1;
                     }
-                    var lineStart = ts.getPositionOfLineAndCharacter(file_9, i, 0);
-                    var lineEnd = i < lastLineInFile ? ts.getPositionOfLineAndCharacter(file_9, i + 1, 0) : file_9.text.length;
-                    var lineContent = file_9.text.slice(lineStart, lineEnd);
+                    var lineStart = ts.getPositionOfLineAndCharacter(file, i, 0);
+                    var lineEnd = i < lastLineInFile ? ts.getPositionOfLineAndCharacter(file, i + 1, 0) : file.text.length;
+                    var lineContent = file.text.slice(lineStart, lineEnd);
                     lineContent = lineContent.replace(/\s+$/g, ""); // trim from end
                     lineContent = lineContent.replace("\t", " "); // convert tabs to single spaces
                     // Output the gutter and the actual contents of the line.
-                    context_2 += formatColorAndReset(padLeft(i + 1 + "", gutterWidth), gutterStyleSequence) + gutterSeparator;
-                    context_2 += lineContent + host.getNewLine();
+                    context += formatColorAndReset(padLeft(i + 1 + "", gutterWidth), gutterStyleSequence) + gutterSeparator;
+                    context += lineContent + host.getNewLine();
                     // Output the gutter and the error span for the line using tildes.
-                    context_2 += formatColorAndReset(padLeft("", gutterWidth), gutterStyleSequence) + gutterSeparator;
-                    context_2 += ForegroundColorEscapeSequences.Red;
+                    context += formatColorAndReset(padLeft("", gutterWidth), gutterStyleSequence) + gutterSeparator;
+                    context += ForegroundColorEscapeSequences.Red;
                     if (i === firstLine) {
                         // If we're on the last line, then limit it to the last character of the last line.
                         // Otherwise, we'll just squiggle the rest of the line, giving 'slice' no end position.
                         var lastCharForLine = i === lastLine ? lastLineChar : undefined;
-                        context_2 += lineContent.slice(0, firstLineChar).replace(/\S/g, " ");
-                        context_2 += lineContent.slice(firstLineChar, lastCharForLine).replace(/./g, "~");
+                        context += lineContent.slice(0, firstLineChar).replace(/\S/g, " ");
+                        context += lineContent.slice(firstLineChar, lastCharForLine).replace(/./g, "~");
                     }
                     else if (i === lastLine) {
-                        context_2 += lineContent.slice(0, lastLineChar).replace(/./g, "~");
+                        context += lineContent.slice(0, lastLineChar).replace(/./g, "~");
                     }
                     else {
                         // Squiggle the entire line.
-                        context_2 += lineContent.replace(/./g, "~");
+                        context += lineContent.replace(/./g, "~");
                     }
-                    context_2 += resetEscapeSequence;
+                    context += resetEscapeSequence;
                 }
                 output += formatColorAndReset(relativeFileName, ForegroundColorEscapeSequences.Cyan);
                 output += ":";
@@ -78431,11 +80862,11 @@ var ts;
             output += flattenDiagnosticMessageText(diagnostic.messageText, host.getNewLine());
             if (diagnostic.file) {
                 output += host.getNewLine();
-                output += context_2;
+                output += context;
             }
             output += host.getNewLine();
         }
-        return output + host.getNewLine();
+        return output;
     }
     ts.formatDiagnosticsWithColorAndContext = formatDiagnosticsWithColorAndContext;
     function flattenDiagnosticMessageText(messageText, newLine) {
@@ -78554,7 +80985,9 @@ var ts;
         var rootNames = createProgramOptions.rootNames, options = createProgramOptions.options, configFileParsingDiagnostics = createProgramOptions.configFileParsingDiagnostics, projectReferences = createProgramOptions.projectReferences;
         var oldProgram = createProgramOptions.oldProgram;
         var program;
-        var files = [];
+        var processingDefaultLibFiles;
+        var processingOtherFiles;
+        var files;
         var commonSourceDirectory;
         var diagnosticsProducingTypeChecker;
         var noDiagnosticsTypeChecker;
@@ -78633,24 +81066,26 @@ var ts;
         // A parallel array to projectReferences storing the results of reading in the referenced tsconfig files
         var resolvedProjectReferences = projectReferences ? [] : undefined;
         var projectReferenceRedirects = ts.createMap();
-        if (projectReferences) {
-            for (var _i = 0, projectReferences_1 = projectReferences; _i < projectReferences_1.length; _i++) {
-                var ref = projectReferences_1[_i];
-                var parsedRef = parseProjectReferenceConfigFile(ref);
-                resolvedProjectReferences.push(parsedRef);
-                if (parsedRef) {
-                    if (parsedRef.commandLine.options.outFile) {
-                        var dtsOutfile = ts.changeExtension(parsedRef.commandLine.options.outFile, ".d.ts");
-                        processSourceFile(dtsOutfile, /*isDefaultLib*/ false, /*packageId*/ undefined);
-                    }
-                    addProjectReferenceRedirects(parsedRef.commandLine, projectReferenceRedirects);
-                }
-            }
-        }
         var shouldCreateNewSourceFile = shouldProgramCreateNewSourceFiles(oldProgram, options);
         var structuralIsReused = tryReuseStructureFromOldProgram();
         if (structuralIsReused !== 2 /* Completely */) {
-            ts.forEach(rootNames, function (name) { return processRootFile(name, /*isDefaultLib*/ false); });
+            processingDefaultLibFiles = [];
+            processingOtherFiles = [];
+            if (projectReferences) {
+                for (var _i = 0, projectReferences_1 = projectReferences; _i < projectReferences_1.length; _i++) {
+                    var ref = projectReferences_1[_i];
+                    var parsedRef = parseProjectReferenceConfigFile(ref);
+                    resolvedProjectReferences.push(parsedRef);
+                    if (parsedRef) {
+                        if (parsedRef.commandLine.options.outFile) {
+                            var dtsOutfile = ts.changeExtension(parsedRef.commandLine.options.outFile, ".d.ts");
+                            processSourceFile(dtsOutfile, /*isDefaultLib*/ false, /*ignoreNoDefaultLib*/ false, /*packageId*/ undefined);
+                        }
+                        addProjectReferenceRedirects(parsedRef.commandLine, projectReferenceRedirects);
+                    }
+                }
+            }
+            ts.forEach(rootNames, function (name) { return processRootFile(name, /*isDefaultLib*/ false, /*ignoreNoDefaultLib*/ false); });
             // load type declarations specified via 'types' argument or implicitly from types/ and node_modules/@types folders
             var typeReferences = ts.getAutomaticTypeDirectiveNames(options, host);
             if (typeReferences.length) {
@@ -78671,15 +81106,18 @@ var ts;
                 // otherwise, using options specified in '--lib' instead of '--target' default library file
                 var defaultLibraryFileName = getDefaultLibraryFileName();
                 if (!options.lib && defaultLibraryFileName) {
-                    processRootFile(defaultLibraryFileName, /*isDefaultLib*/ true);
+                    processRootFile(defaultLibraryFileName, /*isDefaultLib*/ true, /*ignoreNoDefaultLib*/ false);
                 }
                 else {
                     ts.forEach(options.lib, function (libFileName) {
-                        processRootFile(ts.combinePaths(defaultLibraryPath, libFileName), /*isDefaultLib*/ true);
+                        processRootFile(ts.combinePaths(defaultLibraryPath, libFileName), /*isDefaultLib*/ true, /*ignoreNoDefaultLib*/ false);
                     });
                 }
             }
             missingFilePaths = ts.arrayFrom(filesByName.keys(), function (p) { return p; }).filter(function (p) { return !filesByName.get(p); });
+            files = ts.stableSort(processingDefaultLibFiles, compareDefaultLibFiles).concat(processingOtherFiles);
+            processingDefaultLibFiles = undefined;
+            processingOtherFiles = undefined;
         }
         ts.Debug.assert(!!missingFilePaths);
         // Release any files we have acquired in the old program but are
@@ -78724,6 +81162,7 @@ var ts;
             isSourceFileDefaultLibrary: isSourceFileDefaultLibrary,
             dropDiagnosticsProducingTypeChecker: dropDiagnosticsProducingTypeChecker,
             getSourceFileFromReference: getSourceFileFromReference,
+            getLibFileFromReference: getLibFileFromReference,
             sourceFileToPackageName: sourceFileToPackageName,
             redirectTargetsSet: redirectTargetsSet,
             isEmittedFile: isEmittedFile,
@@ -78735,6 +81174,21 @@ var ts;
         ts.performance.mark("afterProgram");
         ts.performance.measure("Program", "beforeProgram", "afterProgram");
         return program;
+        function compareDefaultLibFiles(a, b) {
+            return ts.compareValues(getDefaultLibFilePriority(a), getDefaultLibFilePriority(b));
+        }
+        function getDefaultLibFilePriority(a) {
+            if (ts.containsPath(defaultLibraryPath, a.fileName, /*ignoreCase*/ false)) {
+                var basename = ts.getBaseFileName(a.fileName);
+                if (basename === "lib.d.ts" || basename === "lib.es6.d.ts")
+                    return 0;
+                var name = ts.removeSuffix(ts.removePrefix(basename, "lib."), ".d.ts");
+                var index = ts.libs.indexOf(name);
+                if (index !== -1)
+                    return index + 1;
+            }
+            return ts.libs.length + 2;
+        }
         function getResolvedModuleWithFailedLookupLocationsFromCache(moduleName, containingFile) {
             return moduleResolutionCache && ts.resolveModuleNameFromCache(moduleName, containingFile, moduleResolutionCache);
         }
@@ -78793,13 +81247,13 @@ var ts;
                 // which per above occurred during the current program creation.
                 // Since we assume the filesystem does not change during program creation,
                 // it is safe to reuse resolutions from the earlier call.
-                var result_4 = [];
+                var result_3 = [];
                 for (var _i = 0, moduleNames_1 = moduleNames; _i < moduleNames_1.length; _i++) {
                     var moduleName = moduleNames_1[_i];
                     var resolvedModule = file.resolvedModules.get(moduleName);
-                    result_4.push(resolvedModule);
+                    result_3.push(resolvedModule);
                 }
-                return result_4;
+                return result_3;
             }
             // At this point, we know at least one of the following hold:
             // - file has local declarations for ambient modules
@@ -78979,7 +81433,7 @@ var ts;
             for (var _i = 0, oldSourceFiles_2 = oldSourceFiles; _i < oldSourceFiles_2.length; _i++) {
                 var oldSourceFile = oldSourceFiles_2[_i];
                 var newSourceFile = host.getSourceFileByPath
-                    ? host.getSourceFileByPath(oldSourceFile.fileName, oldSourceFile.path, options.target, /*onError*/ undefined, shouldCreateNewSourceFile)
+                    ? host.getSourceFileByPath(oldSourceFile.fileName, oldSourceFile.resolvedPath || oldSourceFile.path, options.target, /*onError*/ undefined, shouldCreateNewSourceFile)
                     : host.getSourceFile(oldSourceFile.fileName, options.target, /*onError*/ undefined, shouldCreateNewSourceFile); // TODO: GH#18217
                 if (!newSourceFile) {
                     return oldProgram.structureIsReused = 0 /* Not */;
@@ -79021,6 +81475,10 @@ var ts;
                 }
                 if (fileChanged) {
                     // The `newSourceFile` object was created for the new program.
+                    if (!ts.arrayIsEqualTo(oldSourceFile.libReferenceDirectives, newSourceFile.libReferenceDirectives, fileReferenceIsEqualTo)) {
+                        // 'lib' references has changed. Matches behavior in changesAffectModuleResolution
+                        return oldProgram.structureIsReused = 0 /* Not */;
+                    }
                     if (oldSourceFile.hasNoDefaultLib !== newSourceFile.hasNoDefaultLib) {
                         // value of no-default-lib has changed
                         // this will affect if default library is injected into the list of files
@@ -79124,20 +81582,8 @@ var ts;
             return oldProgram.structureIsReused = 2 /* Completely */;
         }
         function getEmitHost(writeFileCallback) {
-            return {
-                getPrependNodes: getPrependNodes,
-                getCanonicalFileName: getCanonicalFileName,
-                getCommonSourceDirectory: program.getCommonSourceDirectory,
-                getCompilerOptions: program.getCompilerOptions,
-                getCurrentDirectory: function () { return currentDirectory; },
-                getNewLine: function () { return host.getNewLine(); },
-                getSourceFile: program.getSourceFile,
-                getSourceFileByPath: program.getSourceFileByPath,
-                getSourceFiles: program.getSourceFiles,
-                isSourceFileFromExternalLibrary: isSourceFileFromExternalLibrary,
-                writeFile: writeFileCallback || (function (fileName, data, writeByteOrderMark, onError, sourceFiles) { return host.writeFile(fileName, data, writeByteOrderMark, onError, sourceFiles); }),
-                isEmitBlocked: isEmitBlocked,
-            };
+            return __assign({ getPrependNodes: getPrependNodes,
+                getCanonicalFileName: getCanonicalFileName, getCommonSourceDirectory: program.getCommonSourceDirectory, getCompilerOptions: program.getCompilerOptions, getCurrentDirectory: function () { return currentDirectory; }, getNewLine: function () { return host.getNewLine(); }, getSourceFile: program.getSourceFile, getSourceFileByPath: program.getSourceFileByPath, getSourceFiles: program.getSourceFiles, isSourceFileFromExternalLibrary: isSourceFileFromExternalLibrary, writeFile: writeFileCallback || (function (fileName, data, writeByteOrderMark, onError, sourceFiles) { return host.writeFile(fileName, data, writeByteOrderMark, onError, sourceFiles); }), isEmitBlocked: isEmitBlocked, readFile: function (f) { return host.readFile(f); }, fileExists: function (f) { return host.fileExists(f); } }, (host.directoryExists ? { directoryExists: function (f) { return host.directoryExists(f); } } : {}));
         }
         function getProjectReferences() {
             if (!resolvedProjectReferences)
@@ -79158,8 +81604,10 @@ var ts;
                         continue;
                     var dtsFilename = ts.changeExtension(resolvedRefOpts.options.outFile, ".d.ts");
                     var js = host.readFile(resolvedRefOpts.options.outFile) || "/* Input file " + resolvedRefOpts.options.outFile + " was missing */\r\n";
+                    var jsMap = host.readFile(resolvedRefOpts.options.outFile + ".map"); // TODO: try to read sourceMappingUrl comment from the js file
                     var dts = host.readFile(dtsFilename) || "/* Input file " + dtsFilename + " was missing */\r\n";
-                    var node = ts.createInputFiles(js, dts);
+                    var dtsMap = host.readFile(dtsFilename + ".map");
+                    var node = ts.createInputFiles(js, dts, jsMap, dtsMap);
                     nodes.push(node);
                 }
             }
@@ -79503,8 +81951,8 @@ var ts;
                             }
                             break;
                     }
-                    for (var _b = 0, nodes_6 = nodes; _b < nodes_6.length; _b++) {
-                        var node = nodes_6[_b];
+                    for (var _b = 0, nodes_5 = nodes; _b < nodes_5.length; _b++) {
+                        var node = nodes_5[_b];
                         walk(node);
                     }
                 }
@@ -79585,8 +82033,8 @@ var ts;
         function getConfigFileParsingDiagnostics() {
             return configFileParsingDiagnostics || ts.emptyArray;
         }
-        function processRootFile(fileName, isDefaultLib) {
-            processSourceFile(ts.normalizePath(fileName), isDefaultLib, /*packageId*/ undefined);
+        function processRootFile(fileName, isDefaultLib, ignoreNoDefaultLib) {
+            processSourceFile(ts.normalizePath(fileName), isDefaultLib, ignoreNoDefaultLib, /*packageId*/ undefined);
         }
         function fileReferenceIsEqualTo(a, b) {
             return a.fileName === b.fileName;
@@ -79686,17 +82134,22 @@ var ts;
                 else if (ts.isLiteralImportTypeNode(node)) {
                     imports = ts.append(imports, node.argument.literal);
                 }
-                else {
-                    collectDynamicImportOrRequireCallsForEachChild(node);
-                    if (ts.hasJSDocNodes(node)) {
-                        ts.forEach(node.jsDoc, collectDynamicImportOrRequireCallsForEachChild);
-                    }
+                collectDynamicImportOrRequireCallsForEachChild(node);
+                if (ts.hasJSDocNodes(node)) {
+                    ts.forEach(node.jsDoc, collectDynamicImportOrRequireCallsForEachChild);
                 }
             }
             function collectDynamicImportOrRequireCallsForEachChild(node) {
                 ts.forEachChild(node, collectDynamicImportOrRequireCalls);
             }
         }
+        function getLibFileFromReference(ref) {
+            var libName = ref.fileName.toLocaleLowerCase();
+            var libFileName = ts.libMap.get(libName);
+            if (libFileName) {
+                return getSourceFile(ts.combinePaths(defaultLibraryPath, libFileName));
+            }
+        }
         /** This should have similar behavior to 'processSourceFile' without diagnostics or mutation. */
         function getSourceFileFromReference(referencingFile, ref) {
             return getSourceFileFromReferenceWorker(resolveTripleslashReference(ref.fileName, referencingFile.fileName), function (fileName) { return filesByName.get(toPath(fileName)); });
@@ -79740,8 +82193,8 @@ var ts;
             }
         }
         /** This has side effects through `findSourceFile`. */
-        function processSourceFile(fileName, isDefaultLib, packageId, refFile, refPos, refEnd) {
-            getSourceFileFromReferenceWorker(fileName, function (fileName) { return findSourceFile(fileName, toPath(fileName), isDefaultLib, refFile, refPos, refEnd, packageId); }, // TODO: GH#18217
+        function processSourceFile(fileName, isDefaultLib, ignoreNoDefaultLib, packageId, refFile, refPos, refEnd) {
+            getSourceFileFromReferenceWorker(fileName, function (fileName) { return findSourceFile(fileName, toPath(fileName), isDefaultLib, ignoreNoDefaultLib, refFile, refPos, refEnd, packageId); }, // TODO: GH#18217
             function (diagnostic) {
                 var args = [];
                 for (var _i = 1; _i < arguments.length; _i++) {
@@ -79777,33 +82230,34 @@ var ts;
             return redirect;
         }
         // Get source file from normalized fileName
-        function findSourceFile(fileName, path, isDefaultLib, refFile, refPos, refEnd, packageId) {
+        function findSourceFile(fileName, path, isDefaultLib, ignoreNoDefaultLib, refFile, refPos, refEnd, packageId) {
             if (filesByName.has(path)) {
-                var file_10 = filesByName.get(path);
+                var file_1 = filesByName.get(path);
                 // try to check if we've already seen this file but with a different casing in path
                 // NOTE: this only makes sense for case-insensitive file systems
-                if (file_10 && options.forceConsistentCasingInFileNames && ts.getNormalizedAbsolutePath(file_10.fileName, currentDirectory) !== ts.getNormalizedAbsolutePath(fileName, currentDirectory)) {
-                    reportFileNamesDifferOnlyInCasingError(fileName, file_10.fileName, refFile, refPos, refEnd);
+                if (file_1 && options.forceConsistentCasingInFileNames && ts.getNormalizedAbsolutePath(file_1.fileName, currentDirectory) !== ts.getNormalizedAbsolutePath(fileName, currentDirectory)) {
+                    reportFileNamesDifferOnlyInCasingError(fileName, file_1.fileName, refFile, refPos, refEnd);
                 }
                 // If the file was previously found via a node_modules search, but is now being processed as a root file,
                 // then everything it sucks in may also be marked incorrectly, and needs to be checked again.
-                if (file_10 && sourceFilesFoundSearchingNodeModules.get(file_10.path) && currentNodeModulesDepth === 0) {
-                    sourceFilesFoundSearchingNodeModules.set(file_10.path, false);
+                if (file_1 && sourceFilesFoundSearchingNodeModules.get(file_1.path) && currentNodeModulesDepth === 0) {
+                    sourceFilesFoundSearchingNodeModules.set(file_1.path, false);
                     if (!options.noResolve) {
-                        processReferencedFiles(file_10, isDefaultLib);
-                        processTypeReferenceDirectives(file_10);
+                        processReferencedFiles(file_1, isDefaultLib);
+                        processTypeReferenceDirectives(file_1);
                     }
-                    modulesWithElidedImports.set(file_10.path, false);
-                    processImportedModules(file_10);
+                    processLibReferenceDirectives(file_1);
+                    modulesWithElidedImports.set(file_1.path, false);
+                    processImportedModules(file_1);
                 }
                 // See if we need to reprocess the imports due to prior skipped imports
-                else if (file_10 && modulesWithElidedImports.get(file_10.path)) {
+                else if (file_1 && modulesWithElidedImports.get(file_1.path)) {
                     if (currentNodeModulesDepth < maxNodeModuleJsDepth) {
-                        modulesWithElidedImports.set(file_10.path, false);
-                        processImportedModules(file_10);
+                        modulesWithElidedImports.set(file_1.path, false);
+                        processImportedModules(file_1);
                     }
                 }
-                return file_10;
+                return file_1;
             }
             var redirectedPath;
             if (refFile) {
@@ -79838,7 +82292,7 @@ var ts;
                     redirectTargetsSet.set(fileFromPackageId.path, true);
                     filesByName.set(path, dupFile);
                     sourceFileToPackageName.set(path, packageId.name);
-                    files.push(dupFile);
+                    processingOtherFiles.push(dupFile);
                     return dupFile;
                 }
                 else if (file) {
@@ -79854,6 +82308,7 @@ var ts;
             if (file) {
                 sourceFilesFoundSearchingNodeModules.set(path, currentNodeModulesDepth > 0);
                 file.path = path;
+                file.resolvedPath = toPath(fileName);
                 if (host.useCaseSensitiveFileNames()) {
                     var pathLowerCase = path.toLowerCase();
                     // for case-sensitive file systems check if we've already seen some file with similar filename ignoring case
@@ -79865,18 +82320,19 @@ var ts;
                         filesByNameIgnoreCase.set(pathLowerCase, file);
                     }
                 }
-                skipDefaultLib = skipDefaultLib || file.hasNoDefaultLib;
+                skipDefaultLib = skipDefaultLib || (file.hasNoDefaultLib && !ignoreNoDefaultLib);
                 if (!options.noResolve) {
                     processReferencedFiles(file, isDefaultLib);
                     processTypeReferenceDirectives(file);
                 }
+                processLibReferenceDirectives(file);
                 // always process imported modules to record module name resolutions
                 processImportedModules(file);
                 if (isDefaultLib) {
-                    files.unshift(file);
+                    processingDefaultLibFiles.push(file);
                 }
                 else {
-                    files.push(file);
+                    processingOtherFiles.push(file);
                 }
             }
             return file;
@@ -79900,7 +82356,7 @@ var ts;
         function processReferencedFiles(file, isDefaultLib) {
             ts.forEach(file.referencedFiles, function (ref) {
                 var referencedFileName = resolveTripleslashReference(ref.fileName, file.fileName);
-                processSourceFile(referencedFileName, isDefaultLib, /*packageId*/ undefined, file, ref.pos, ref.end);
+                processSourceFile(referencedFileName, isDefaultLib, /*ignoreNoDefaultLib*/ false, /*packageId*/ undefined, file, ref.pos, ref.end);
             });
         }
         function processTypeReferenceDirectives(file) {
@@ -79929,7 +82385,7 @@ var ts;
             if (resolvedTypeReferenceDirective) {
                 if (resolvedTypeReferenceDirective.primary) {
                     // resolved from the primary path
-                    processSourceFile(resolvedTypeReferenceDirective.resolvedFileName, /*isDefaultLib*/ false, resolvedTypeReferenceDirective.packageId, refFile, refPos, refEnd); // TODO: GH#18217
+                    processSourceFile(resolvedTypeReferenceDirective.resolvedFileName, /*isDefaultLib*/ false, /*ignoreNoDefaultLib*/ false, resolvedTypeReferenceDirective.packageId, refFile, refPos, refEnd); // TODO: GH#18217
                 }
                 else {
                     // If we already resolved to this file, it must have been a secondary reference. Check file contents
@@ -79948,7 +82404,7 @@ var ts;
                     }
                     else {
                         // First resolution of this library
-                        processSourceFile(resolvedTypeReferenceDirective.resolvedFileName, /*isDefaultLib*/ false, resolvedTypeReferenceDirective.packageId, refFile, refPos, refEnd);
+                        processSourceFile(resolvedTypeReferenceDirective.resolvedFileName, /*isDefaultLib*/ false, /*ignoreNoDefaultLib*/ false, resolvedTypeReferenceDirective.packageId, refFile, refPos, refEnd);
                     }
                 }
             }
@@ -79959,6 +82415,22 @@ var ts;
                 resolvedTypeReferenceDirectives.set(typeReferenceDirective, resolvedTypeReferenceDirective);
             }
         }
+        function processLibReferenceDirectives(file) {
+            ts.forEach(file.libReferenceDirectives, function (libReference) {
+                var libName = libReference.fileName.toLocaleLowerCase();
+                var libFileName = ts.libMap.get(libName);
+                if (libFileName) {
+                    // we ignore any 'no-default-lib' reference set on this file.
+                    processRootFile(ts.combinePaths(defaultLibraryPath, libFileName), /*isDefaultLib*/ true, /*ignoreNoDefaultLib*/ true);
+                }
+                else {
+                    var unqualifiedLibName = ts.removeSuffix(ts.removePrefix(libName, "lib."), ".d.ts");
+                    var suggestion = ts.getSpellingSuggestion(unqualifiedLibName, ts.libs, ts.identity);
+                    var message = suggestion ? ts.Diagnostics.Cannot_find_lib_definition_for_0_Did_you_mean_1 : ts.Diagnostics.Cannot_find_lib_definition_for_0;
+                    fileProcessingDiagnostics.add(createDiagnostic(file, libReference.pos, libReference.end, message, libName, suggestion));
+                }
+            });
+        }
         function createDiagnostic(refFile, refPos, refEnd, message) {
             var args = [];
             for (var _i = 4; _i < arguments.length; _i++) {
@@ -80016,7 +82488,7 @@ var ts;
                     else if (shouldAddFile) {
                         var path = toPath(resolvedFileName);
                         var pos = ts.skipTrivia(file.text, file.imports[i].pos);
-                        findSourceFile(resolvedFileName, path, /*isDefaultLib*/ false, file, pos, file.imports[i].end, resolution.packageId);
+                        findSourceFile(resolvedFileName, path, /*isDefaultLib*/ false, /*ignoreNoDefaultLib*/ false, file, pos, file.imports[i].end, resolution.packageId);
                     }
                     if (isFromNodeModulesSearch) {
                         currentNodeModulesDepth--;
@@ -80031,9 +82503,9 @@ var ts;
         function computeCommonSourceDirectory(sourceFiles) {
             var fileNames = [];
             for (var _i = 0, sourceFiles_2 = sourceFiles; _i < sourceFiles_2.length; _i++) {
-                var file_11 = sourceFiles_2[_i];
-                if (!file_11.isDeclarationFile) {
-                    fileNames.push(file_11.fileName);
+                var file = sourceFiles_2[_i];
+                if (!file.isDeclarationFile) {
+                    fileNames.push(file.fileName);
                 }
             }
             return computeCommonSourceDirectoryOfFilenames(fileNames, currentDirectory, getCanonicalFileName);
@@ -80137,14 +82609,14 @@ var ts;
             if (options.composite && rootNames.length < files.length) {
                 var normalizedRootNames = rootNames.map(function (r) { return ts.normalizePath(r).toLowerCase(); });
                 var sourceFiles = files.filter(function (f) { return !f.isDeclarationFile; }).map(function (f) { return ts.normalizePath(f.path).toLowerCase(); });
-                var _loop_10 = function (file_12) {
-                    if (normalizedRootNames.every(function (r) { return r !== file_12; })) {
-                        programDiagnostics.add(ts.createCompilerDiagnostic(ts.Diagnostics.File_0_is_not_in_project_file_list_Projects_must_list_all_files_or_use_an_include_pattern, file_12));
+                var _loop_8 = function (file) {
+                    if (normalizedRootNames.every(function (r) { return r !== file; })) {
+                        programDiagnostics.add(ts.createCompilerDiagnostic(ts.Diagnostics.File_0_is_not_in_project_file_list_Projects_must_list_all_files_or_use_an_include_pattern, file));
                     }
                 };
                 for (var _i = 0, sourceFiles_4 = sourceFiles; _i < sourceFiles_4.length; _i++) {
-                    var file_12 = sourceFiles_4[_i];
-                    _loop_10(file_12);
+                    var file = sourceFiles_4[_i];
+                    _loop_8(file);
                 }
             }
             if (options.paths) {
@@ -80496,6 +82968,7 @@ var ts;
         }
         return ref.path;
     }
+    ts.resolveProjectReferencePath = resolveProjectReferencePath;
     /* @internal */
     /**
      * Returns a DiagnosticMessage if we won't include a resolved module due to its extension.
@@ -81446,8 +83919,29 @@ var ts;
         function isNodeModulesAtTypesDirectory(dirPath) {
             return ts.endsWith(dirPath, "/node_modules/@types");
         }
-        function isDirectoryAtleastAtLevelFromFSRoot(dirPath, minLevels) {
-            for (var searchIndex = ts.getRootLength(dirPath); minLevels > 0; minLevels--) {
+        /**
+         * Filter out paths like
+         * "/", "/user", "/user/username", "/user/username/folderAtRoot",
+         * "c:/", "c:/users", "c:/users/username", "c:/users/username/folderAtRoot", "c:/folderAtRoot"
+         * @param dirPath
+         */
+        function canWatchDirectory(dirPath) {
+            var rootLength = ts.getRootLength(dirPath);
+            if (dirPath.length === rootLength) {
+                // Ignore "/", "c:/"
+                return false;
+            }
+            var nextDirectorySeparator = dirPath.indexOf(ts.directorySeparator, rootLength);
+            if (nextDirectorySeparator === -1) {
+                // ignore "/user", "c:/users" or "c:/folderAtRoot"
+                return false;
+            }
+            if (dirPath.charCodeAt(0) !== 47 /* slash */ &&
+                dirPath.substr(rootLength, nextDirectorySeparator).search(/users/i) === -1) {
+                // Paths like c:/folderAtRoot/subFolder are allowed
+                return true;
+            }
+            for (var searchIndex = nextDirectorySeparator + 1, searchLevels = 2; searchLevels > 0; searchLevels--) {
                 searchIndex = dirPath.indexOf(ts.directorySeparator, searchIndex) + 1;
                 if (searchIndex === 0) {
                     // Folder isnt at expected minimun levels
@@ -81456,14 +83950,6 @@ var ts;
             }
             return true;
         }
-        function canWatchDirectory(dirPath) {
-            return isDirectoryAtleastAtLevelFromFSRoot(dirPath, 
-            // When root is "/" do not watch directories like:
-            // "/", "/user", "/user/username", "/user/username/folderAtRoot"
-            // When root is "c:/" do not watch directories like:
-            // "c:/", "c:/folderAtRoot"
-            dirPath.charCodeAt(0) === 47 /* slash */ ? 3 : 1);
-        }
         function filterFSRootDirectoriesToWatch(watchPath, dirPath) {
             if (!canWatchDirectory(dirPath)) {
                 watchPath.ignore = true;
@@ -81773,6 +84259,315 @@ var ts;
     }
     ts.createResolutionCache = createResolutionCache;
 })(ts || (ts = {}));
+// Used by importFixes to synthesize import module specifiers.
+/* @internal */
+var ts;
+(function (ts) {
+    var moduleSpecifiers;
+    (function (moduleSpecifiers) {
+        // Note: fromSourceFile is just for usesJsExtensionOnImports
+        function getModuleSpecifier(compilerOptions, fromSourceFile, fromSourceFileName, toFileName, host, preferences) {
+            if (preferences === void 0) { preferences = {}; }
+            var info = getInfo(compilerOptions, fromSourceFile, fromSourceFileName, host);
+            return getGlobalModuleSpecifier(toFileName, info, host, compilerOptions) ||
+                ts.first(getLocalModuleSpecifiers(toFileName, info, compilerOptions, preferences));
+        }
+        moduleSpecifiers.getModuleSpecifier = getModuleSpecifier;
+        // For each symlink/original for a module, returns a list of ways to import that file.
+        function getModuleSpecifiers(moduleSymbol, program, importingSourceFile, host, preferences) {
+            var ambient = tryGetModuleNameFromAmbientModule(moduleSymbol);
+            if (ambient)
+                return [[ambient]];
+            var compilerOptions = program.getCompilerOptions();
+            var info = getInfo(compilerOptions, importingSourceFile, importingSourceFile.fileName, host);
+            var modulePaths = getAllModulePaths(program, ts.getSourceFileOfNode(moduleSymbol.valueDeclaration));
+            var global = ts.mapDefined(modulePaths, function (moduleFileName) { return getGlobalModuleSpecifier(moduleFileName, info, host, compilerOptions); });
+            return global.length ? global.map(function (g) { return [g]; }) : modulePaths.map(function (moduleFileName) {
+                return getLocalModuleSpecifiers(moduleFileName, info, compilerOptions, preferences);
+            });
+        }
+        moduleSpecifiers.getModuleSpecifiers = getModuleSpecifiers;
+        // importingSourceFileName is separate because getEditsForFileRename may need to specify an updated path
+        function getInfo(compilerOptions, importingSourceFile, importingSourceFileName, host) {
+            var moduleResolutionKind = ts.getEmitModuleResolutionKind(compilerOptions);
+            var addJsExtension = usesJsExtensionOnImports(importingSourceFile);
+            var getCanonicalFileName = ts.createGetCanonicalFileName(host.useCaseSensitiveFileNames ? host.useCaseSensitiveFileNames() : true);
+            var sourceDirectory = ts.getDirectoryPath(importingSourceFileName);
+            return { moduleResolutionKind: moduleResolutionKind, addJsExtension: addJsExtension, getCanonicalFileName: getCanonicalFileName, sourceDirectory: sourceDirectory };
+        }
+        function getGlobalModuleSpecifier(moduleFileName, _a, host, compilerOptions) {
+            var addJsExtension = _a.addJsExtension, getCanonicalFileName = _a.getCanonicalFileName, sourceDirectory = _a.sourceDirectory;
+            return tryGetModuleNameFromTypeRoots(compilerOptions, host, getCanonicalFileName, moduleFileName, addJsExtension)
+                || tryGetModuleNameAsNodeModule(compilerOptions, moduleFileName, host, getCanonicalFileName, sourceDirectory)
+                || compilerOptions.rootDirs && tryGetModuleNameFromRootDirs(compilerOptions.rootDirs, moduleFileName, sourceDirectory, getCanonicalFileName);
+        }
+        function getLocalModuleSpecifiers(moduleFileName, _a, compilerOptions, preferences) {
+            var moduleResolutionKind = _a.moduleResolutionKind, addJsExtension = _a.addJsExtension, getCanonicalFileName = _a.getCanonicalFileName, sourceDirectory = _a.sourceDirectory;
+            var baseUrl = compilerOptions.baseUrl, paths = compilerOptions.paths;
+            var relativePath = removeExtensionAndIndexPostFix(ts.ensurePathIsNonModuleName(ts.getRelativePathFromDirectory(sourceDirectory, moduleFileName, getCanonicalFileName)), moduleResolutionKind, addJsExtension);
+            if (!baseUrl || preferences.importModuleSpecifierPreference === "relative") {
+                return [relativePath];
+            }
+            var relativeToBaseUrl = getRelativePathIfInDirectory(moduleFileName, baseUrl, getCanonicalFileName);
+            if (!relativeToBaseUrl) {
+                return [relativePath];
+            }
+            var importRelativeToBaseUrl = removeExtensionAndIndexPostFix(relativeToBaseUrl, moduleResolutionKind, addJsExtension);
+            if (paths) {
+                var fromPaths = tryGetModuleNameFromPaths(ts.removeFileExtension(relativeToBaseUrl), importRelativeToBaseUrl, paths);
+                if (fromPaths) {
+                    return [fromPaths];
+                }
+            }
+            if (preferences.importModuleSpecifierPreference === "non-relative") {
+                return [importRelativeToBaseUrl];
+            }
+            if (preferences.importModuleSpecifierPreference !== undefined)
+                ts.Debug.assertNever(preferences.importModuleSpecifierPreference);
+            if (isPathRelativeToParent(relativeToBaseUrl)) {
+                return [relativePath];
+            }
+            /*
+            Prefer a relative import over a baseUrl import if it doesn't traverse up to baseUrl.
+    
+            Suppose we have:
+                baseUrl = /base
+                sourceDirectory = /base/a/b
+                moduleFileName = /base/foo/bar
+            Then:
+                relativePath = ../../foo/bar
+                getRelativePathNParents(relativePath) = 2
+                pathFromSourceToBaseUrl = ../../
+                getRelativePathNParents(pathFromSourceToBaseUrl) = 2
+                2 < 2 = false
+            In this case we should prefer using the baseUrl path "/a/b" instead of the relative path "../../foo/bar".
+    
+            Suppose we have:
+                baseUrl = /base
+                sourceDirectory = /base/foo/a
+                moduleFileName = /base/foo/bar
+            Then:
+                relativePath = ../a
+                getRelativePathNParents(relativePath) = 1
+                pathFromSourceToBaseUrl = ../../
+                getRelativePathNParents(pathFromSourceToBaseUrl) = 2
+                1 < 2 = true
+            In this case we should prefer using the relative path "../a" instead of the baseUrl path "foo/a".
+            */
+            var pathFromSourceToBaseUrl = ts.ensurePathIsNonModuleName(ts.getRelativePathFromDirectory(sourceDirectory, baseUrl, getCanonicalFileName));
+            var relativeFirst = getRelativePathNParents(relativePath) < getRelativePathNParents(pathFromSourceToBaseUrl);
+            return relativeFirst ? [relativePath, importRelativeToBaseUrl] : [importRelativeToBaseUrl, relativePath];
+        }
+        function usesJsExtensionOnImports(_a) {
+            var imports = _a.imports;
+            return ts.firstDefined(imports, function (_a) {
+                var text = _a.text;
+                return ts.pathIsRelative(text) ? ts.fileExtensionIs(text, ".js" /* Js */) : undefined;
+            }) || false;
+        }
+        /**
+         * Looks for a existing imports that use symlinks to this module.
+         * Only if no symlink is available, the real path will be used.
+         */
+        function getAllModulePaths(program, _a) {
+            var fileName = _a.fileName;
+            var symlinks = ts.mapDefined(program.getSourceFiles(), function (sf) {
+                return sf.resolvedModules && ts.firstDefinedIterator(sf.resolvedModules.values(), function (res) {
+                    return res && res.resolvedFileName === fileName ? res.originalPath : undefined;
+                });
+            });
+            return symlinks.length === 0 ? [fileName] : symlinks;
+        }
+        function getRelativePathNParents(relativePath) {
+            var components = ts.getPathComponents(relativePath);
+            if (components[0] || components.length === 1)
+                return 0;
+            for (var i = 1; i < components.length; i++) {
+                if (components[i] !== "..")
+                    return i - 1;
+            }
+            return components.length - 1;
+        }
+        function tryGetModuleNameFromAmbientModule(moduleSymbol) {
+            var decl = moduleSymbol.valueDeclaration;
+            if (ts.isModuleDeclaration(decl) && ts.isStringLiteral(decl.name)) {
+                return decl.name.text;
+            }
+        }
+        function tryGetModuleNameFromPaths(relativeToBaseUrlWithIndex, relativeToBaseUrl, paths) {
+            for (var key in paths) {
+                for (var _i = 0, _a = paths[key]; _i < _a.length; _i++) {
+                    var patternText_1 = _a[_i];
+                    var pattern = ts.removeFileExtension(ts.normalizePath(patternText_1));
+                    var indexOfStar = pattern.indexOf("*");
+                    if (indexOfStar === 0 && pattern.length === 1) {
+                        continue;
+                    }
+                    else if (indexOfStar !== -1) {
+                        var prefix = pattern.substr(0, indexOfStar);
+                        var suffix = pattern.substr(indexOfStar + 1);
+                        if (relativeToBaseUrl.length >= prefix.length + suffix.length &&
+                            ts.startsWith(relativeToBaseUrl, prefix) &&
+                            ts.endsWith(relativeToBaseUrl, suffix)) {
+                            var matchedStar = relativeToBaseUrl.substr(prefix.length, relativeToBaseUrl.length - suffix.length);
+                            return key.replace("*", matchedStar);
+                        }
+                    }
+                    else if (pattern === relativeToBaseUrl || pattern === relativeToBaseUrlWithIndex) {
+                        return key;
+                    }
+                }
+            }
+        }
+        function tryGetModuleNameFromRootDirs(rootDirs, moduleFileName, sourceDirectory, getCanonicalFileName) {
+            var normalizedTargetPath = getPathRelativeToRootDirs(moduleFileName, rootDirs, getCanonicalFileName);
+            if (normalizedTargetPath === undefined) {
+                return undefined;
+            }
+            var normalizedSourcePath = getPathRelativeToRootDirs(sourceDirectory, rootDirs, getCanonicalFileName);
+            var relativePath = normalizedSourcePath !== undefined ? ts.ensurePathIsNonModuleName(ts.getRelativePathFromDirectory(normalizedSourcePath, normalizedTargetPath, getCanonicalFileName)) : normalizedTargetPath;
+            return ts.removeFileExtension(relativePath);
+        }
+        function tryGetModuleNameFromTypeRoots(options, host, getCanonicalFileName, moduleFileName, addJsExtension) {
+            var roots = ts.getEffectiveTypeRoots(options, host);
+            return ts.firstDefined(roots, function (unNormalizedTypeRoot) {
+                var typeRoot = ts.toPath(unNormalizedTypeRoot, /*basePath*/ undefined, getCanonicalFileName);
+                if (ts.startsWith(moduleFileName, typeRoot)) {
+                    // For a type definition, we can strip `/index` even with classic resolution.
+                    return removeExtensionAndIndexPostFix(moduleFileName.substring(typeRoot.length + 1), ts.ModuleResolutionKind.NodeJs, addJsExtension);
+                }
+            });
+        }
+        function tryGetModuleNameAsNodeModule(options, moduleFileName, host, getCanonicalFileName, sourceDirectory) {
+            if (ts.getEmitModuleResolutionKind(options) !== ts.ModuleResolutionKind.NodeJs) {
+                // nothing to do here
+                return undefined;
+            }
+            var parts = getNodeModulePathParts(moduleFileName);
+            if (!parts) {
+                return undefined;
+            }
+            // Simplify the full file path to something that can be resolved by Node.
+            // If the module could be imported by a directory name, use that directory's name
+            var moduleSpecifier = getDirectoryOrExtensionlessFileName(moduleFileName);
+            // Get a path that's relative to node_modules or the importing file's path
+            // if node_modules folder is in this folder or any of its parent folders, no need to keep it.
+            if (!ts.startsWith(sourceDirectory, moduleSpecifier.substring(0, parts.topLevelNodeModulesIndex)))
+                return undefined;
+            // If the module was found in @types, get the actual Node package name
+            return ts.getPackageNameFromAtTypesDirectory(moduleSpecifier.substring(parts.topLevelPackageNameIndex + 1));
+            function getDirectoryOrExtensionlessFileName(path) {
+                // If the file is the main module, it can be imported by the package name
+                var packageRootPath = path.substring(0, parts.packageRootIndex);
+                var packageJsonPath = ts.combinePaths(packageRootPath, "package.json");
+                if (host.fileExists(packageJsonPath)) { // TODO: GH#18217
+                    var packageJsonContent = JSON.parse(host.readFile(packageJsonPath));
+                    if (packageJsonContent) {
+                        var mainFileRelative = packageJsonContent.typings || packageJsonContent.types || packageJsonContent.main;
+                        if (mainFileRelative) {
+                            var mainExportFile = ts.toPath(mainFileRelative, packageRootPath, getCanonicalFileName);
+                            if (ts.removeFileExtension(mainExportFile) === ts.removeFileExtension(getCanonicalFileName(path))) {
+                                return packageRootPath;
+                            }
+                        }
+                    }
+                }
+                // We still have a file name - remove the extension
+                var fullModulePathWithoutExtension = ts.removeFileExtension(path);
+                // If the file is /index, it can be imported by its directory name
+                // IFF there is not _also_ a file by the same name
+                if (getCanonicalFileName(fullModulePathWithoutExtension.substring(parts.fileNameIndex)) === "/index" && !tryGetAnyFileFromPath(host, fullModulePathWithoutExtension.substring(0, parts.fileNameIndex))) {
+                    return fullModulePathWithoutExtension.substring(0, parts.fileNameIndex);
+                }
+                return fullModulePathWithoutExtension;
+            }
+        }
+        function tryGetAnyFileFromPath(host, path) {
+            // We check all js, `node` and `json` extensions in addition to TS, since node module resolution would also choose those over the directory
+            var extensions = ts.getSupportedExtensions({ allowJs: true }, [{ extension: "node", isMixedContent: false }, { extension: "json", isMixedContent: false, scriptKind: 6 /* JSON */ }]);
+            for (var _i = 0, extensions_1 = extensions; _i < extensions_1.length; _i++) {
+                var e = extensions_1[_i];
+                var fullPath = path + e;
+                if (host.fileExists(fullPath)) { // TODO: GH#18217
+                    return fullPath;
+                }
+            }
+        }
+        function getNodeModulePathParts(fullPath) {
+            // If fullPath can't be valid module file within node_modules, returns undefined.
+            // Example of expected pattern: /base/path/node_modules/[@scope/otherpackage/@otherscope/node_modules/]package/[subdirectory/]file.js
+            // Returns indices:                       ^            ^                                                      ^             ^
+            var topLevelNodeModulesIndex = 0;
+            var topLevelPackageNameIndex = 0;
+            var packageRootIndex = 0;
+            var fileNameIndex = 0;
+            var States;
+            (function (States) {
+                States[States["BeforeNodeModules"] = 0] = "BeforeNodeModules";
+                States[States["NodeModules"] = 1] = "NodeModules";
+                States[States["Scope"] = 2] = "Scope";
+                States[States["PackageContent"] = 3] = "PackageContent";
+            })(States || (States = {}));
+            var partStart = 0;
+            var partEnd = 0;
+            var state = 0 /* BeforeNodeModules */;
+            while (partEnd >= 0) {
+                partStart = partEnd;
+                partEnd = fullPath.indexOf("/", partStart + 1);
+                switch (state) {
+                    case 0 /* BeforeNodeModules */:
+                        if (fullPath.indexOf("/node_modules/", partStart) === partStart) {
+                            topLevelNodeModulesIndex = partStart;
+                            topLevelPackageNameIndex = partEnd;
+                            state = 1 /* NodeModules */;
+                        }
+                        break;
+                    case 1 /* NodeModules */:
+                    case 2 /* Scope */:
+                        if (state === 1 /* NodeModules */ && fullPath.charAt(partStart + 1) === "@") {
+                            state = 2 /* Scope */;
+                        }
+                        else {
+                            packageRootIndex = partEnd;
+                            state = 3 /* PackageContent */;
+                        }
+                        break;
+                    case 3 /* PackageContent */:
+                        if (fullPath.indexOf("/node_modules/", partStart) === partStart) {
+                            state = 1 /* NodeModules */;
+                        }
+                        else {
+                            state = 3 /* PackageContent */;
+                        }
+                        break;
+                }
+            }
+            fileNameIndex = partStart;
+            return state > 1 /* NodeModules */ ? { topLevelNodeModulesIndex: topLevelNodeModulesIndex, topLevelPackageNameIndex: topLevelPackageNameIndex, packageRootIndex: packageRootIndex, fileNameIndex: fileNameIndex } : undefined;
+        }
+        function getPathRelativeToRootDirs(path, rootDirs, getCanonicalFileName) {
+            return ts.firstDefined(rootDirs, function (rootDir) {
+                var relativePath = getRelativePathIfInDirectory(path, rootDir, getCanonicalFileName); // TODO: GH#18217
+                return isPathRelativeToParent(relativePath) ? undefined : relativePath;
+            });
+        }
+        function removeExtensionAndIndexPostFix(fileName, moduleResolutionKind, addJsExtension) {
+            var noExtension = ts.removeFileExtension(fileName);
+            return addJsExtension
+                ? noExtension + ".js"
+                : moduleResolutionKind === ts.ModuleResolutionKind.NodeJs
+                    ? ts.removeSuffix(noExtension, "/index")
+                    : noExtension;
+        }
+        function getRelativePathIfInDirectory(path, directoryPath, getCanonicalFileName) {
+            var relativePath = ts.getRelativePathToDirectoryOrUrl(directoryPath, path, directoryPath, getCanonicalFileName, /*isAbsolutePathAnUrl*/ false);
+            return ts.isRootedDiskPath(relativePath) ? undefined : relativePath;
+        }
+        function isPathRelativeToParent(path) {
+            return ts.startsWith(path, "..");
+        }
+    })(moduleSpecifiers = ts.moduleSpecifiers || (ts.moduleSpecifiers = {}));
+})(ts || (ts = {}));
 /*@internal*/
 var ts;
 (function (ts) {
@@ -81942,11 +84737,11 @@ var ts;
             watchFile: system.watchFile ? (function (path, callback, pollingInterval) { return system.watchFile(path, callback, pollingInterval); }) : function () { return noopFileWatcher; },
             watchDirectory: system.watchDirectory ? (function (path, callback, recursive) { return system.watchDirectory(path, callback, recursive); }) : function () { return noopFileWatcher; },
             setTimeout: system.setTimeout ? (function (callback, ms) {
-                var _a;
                 var args = [];
                 for (var _i = 2; _i < arguments.length; _i++) {
                     args[_i - 2] = arguments[_i];
                 }
+                var _a;
                 return (_a = system.setTimeout).call.apply(_a, [system, callback, ms].concat(args));
             }) : ts.noop,
             clearTimeout: system.clearTimeout ? (function (timeoutId) { return system.clearTimeout(timeoutId); }) : ts.noop,
@@ -82472,2139 +85267,1381 @@ var ts;
 })(ts || (ts = {}));
 var ts;
 (function (ts) {
-    /* @internal */
-    ts.compileOnSaveCommandLineOption = { name: "compileOnSave", type: "boolean" };
-    /* @internal */
-    ts.optionDeclarations = [
-        // CommandLine only options
+    var minimumDate = new Date(-8640000000000000);
+    var maximumDate = new Date(8640000000000000);
+    var BuildResultFlags;
+    (function (BuildResultFlags) {
+        BuildResultFlags[BuildResultFlags["None"] = 0] = "None";
+        /**
+         * No errors of any kind occurred during build
+         */
+        BuildResultFlags[BuildResultFlags["Success"] = 1] = "Success";
+        /**
+         * None of the .d.ts files emitted by this build were
+         * different from the existing files on disk
+         */
+        BuildResultFlags[BuildResultFlags["DeclarationOutputUnchanged"] = 2] = "DeclarationOutputUnchanged";
+        BuildResultFlags[BuildResultFlags["ConfigFileErrors"] = 4] = "ConfigFileErrors";
+        BuildResultFlags[BuildResultFlags["SyntaxErrors"] = 8] = "SyntaxErrors";
+        BuildResultFlags[BuildResultFlags["TypeErrors"] = 16] = "TypeErrors";
+        BuildResultFlags[BuildResultFlags["DeclarationEmitErrors"] = 32] = "DeclarationEmitErrors";
+        BuildResultFlags[BuildResultFlags["AnyErrors"] = 60] = "AnyErrors";
+    })(BuildResultFlags || (BuildResultFlags = {}));
+    var UpToDateStatusType;
+    (function (UpToDateStatusType) {
+        UpToDateStatusType[UpToDateStatusType["Unbuildable"] = 0] = "Unbuildable";
+        UpToDateStatusType[UpToDateStatusType["UpToDate"] = 1] = "UpToDate";
+        /**
+         * The project appears out of date because its upstream inputs are newer than its outputs,
+         * but all of its outputs are actually newer than the previous identical outputs of its (.d.ts) inputs.
+         * This means we can Pseudo-build (just touch timestamps), as if we had actually built this project.
+         */
+        UpToDateStatusType[UpToDateStatusType["UpToDateWithUpstreamTypes"] = 2] = "UpToDateWithUpstreamTypes";
+        UpToDateStatusType[UpToDateStatusType["OutputMissing"] = 3] = "OutputMissing";
+        UpToDateStatusType[UpToDateStatusType["OutOfDateWithSelf"] = 4] = "OutOfDateWithSelf";
+        UpToDateStatusType[UpToDateStatusType["OutOfDateWithUpstream"] = 5] = "OutOfDateWithUpstream";
+        UpToDateStatusType[UpToDateStatusType["UpstreamOutOfDate"] = 6] = "UpstreamOutOfDate";
+        UpToDateStatusType[UpToDateStatusType["UpstreamBlocked"] = 7] = "UpstreamBlocked";
+        /**
+         * Projects with no outputs (i.e. "solution" files)
+         */
+        UpToDateStatusType[UpToDateStatusType["ContainerOnly"] = 8] = "ContainerOnly";
+    })(UpToDateStatusType = ts.UpToDateStatusType || (ts.UpToDateStatusType = {}));
+    /**
+     * A FileMap maintains a normalized-key to value relationship
+     */
+    function createFileMap() {
+        // tslint:disable-next-line:no-null-keyword
+        var lookup = ts.createMap();
+        return {
+            setValue: setValue,
+            getValue: getValue,
+            getValueOrUndefined: getValueOrUndefined,
+            removeKey: removeKey,
+            getKeys: getKeys,
+            hasKey: hasKey
+        };
+        function getKeys() {
+            return Object.keys(lookup);
+        }
+        function hasKey(fileName) {
+            return lookup.has(ts.normalizePath(fileName));
+        }
+        function removeKey(fileName) {
+            lookup.delete(ts.normalizePath(fileName));
+        }
+        function setValue(fileName, value) {
+            lookup.set(ts.normalizePath(fileName), value);
+        }
+        function getValue(fileName) {
+            var f = ts.normalizePath(fileName);
+            if (lookup.has(f)) {
+                return lookup.get(f);
+            }
+            else {
+                throw new Error("No value corresponding to " + fileName + " exists in this map");
+            }
+        }
+        function getValueOrUndefined(fileName) {
+            var f = ts.normalizePath(fileName);
+            return lookup.get(f);
+        }
+    }
+    function createDependencyMapper() {
+        var childToParents = createFileMap();
+        var parentToChildren = createFileMap();
+        var allKeys = createFileMap();
+        function addReference(childConfigFileName, parentConfigFileName) {
+            addEntry(childToParents, childConfigFileName, parentConfigFileName);
+            addEntry(parentToChildren, parentConfigFileName, childConfigFileName);
+        }
+        function getReferencesTo(parentConfigFileName) {
+            return parentToChildren.getValueOrUndefined(parentConfigFileName) || [];
+        }
+        function getReferencesOf(childConfigFileName) {
+            return childToParents.getValueOrUndefined(childConfigFileName) || [];
+        }
+        function getKeys() {
+            return allKeys.getKeys();
+        }
+        function addEntry(mapToAddTo, key, element) {
+            key = ts.normalizePath(key);
+            element = ts.normalizePath(element);
+            var arr = mapToAddTo.getValueOrUndefined(key);
+            if (arr === undefined) {
+                mapToAddTo.setValue(key, arr = []);
+            }
+            if (arr.indexOf(element) < 0) {
+                arr.push(element);
+            }
+            allKeys.setValue(key, true);
+            allKeys.setValue(element, true);
+        }
+        return {
+            addReference: addReference,
+            getReferencesTo: getReferencesTo,
+            getReferencesOf: getReferencesOf,
+            getKeys: getKeys
+        };
+    }
+    ts.createDependencyMapper = createDependencyMapper;
+    function getOutputDeclarationFileName(inputFileName, configFile) {
+        var relativePath = ts.getRelativePathFromDirectory(rootDirOfOptions(configFile.options, configFile.options.configFilePath), inputFileName, /*ignoreCase*/ true);
+        var outputPath = ts.resolvePath(configFile.options.declarationDir || configFile.options.outDir || ts.getDirectoryPath(configFile.options.configFilePath), relativePath);
+        return ts.changeExtension(outputPath, ".d.ts" /* Dts */);
+    }
+    function getOutputJavaScriptFileName(inputFileName, configFile) {
+        var relativePath = ts.getRelativePathFromDirectory(rootDirOfOptions(configFile.options, configFile.options.configFilePath), inputFileName, /*ignoreCase*/ true);
+        var outputPath = ts.resolvePath(configFile.options.outDir || ts.getDirectoryPath(configFile.options.configFilePath), relativePath);
+        return ts.changeExtension(outputPath, (ts.fileExtensionIs(inputFileName, ".tsx" /* Tsx */) && configFile.options.jsx === 1 /* Preserve */) ? ".jsx" /* Jsx */ : ".js" /* Js */);
+    }
+    function getOutputFileNames(inputFileName, configFile) {
+        if (configFile.options.outFile) {
+            return ts.emptyArray;
+        }
+        var outputs = [];
+        outputs.push(getOutputJavaScriptFileName(inputFileName, configFile));
+        if (configFile.options.declaration) {
+            var dts = outputs.push(getOutputDeclarationFileName(inputFileName, configFile));
+            if (configFile.options.declarationMap) {
+                outputs.push(dts + ".map");
+            }
+        }
+        return outputs;
+    }
+    function getOutFileOutputs(project) {
+        if (!project.options.outFile) {
+            return ts.Debug.fail("outFile must be set");
+        }
+        var outputs = [];
+        outputs.push(project.options.outFile);
+        if (project.options.declaration) {
+            var dts = ts.changeExtension(project.options.outFile, ".d.ts" /* Dts */);
+            outputs.push(dts);
+            if (project.options.declarationMap) {
+                outputs.push(dts + ".map");
+            }
+        }
+        return outputs;
+    }
+    function rootDirOfOptions(opts, configFileName) {
+        return opts.rootDir || ts.getDirectoryPath(configFileName);
+    }
+    function createConfigFileCache(host) {
+        var cache = createFileMap();
+        var configParseHost = ts.parseConfigHostFromCompilerHost(host);
+        function parseConfigFile(configFilePath) {
+            var sourceFile = host.getSourceFile(configFilePath, 100 /* JSON */);
+            if (sourceFile === undefined) {
+                return undefined;
+            }
+            var parsed = ts.parseJsonSourceFileConfigFileContent(sourceFile, configParseHost, ts.getDirectoryPath(configFilePath));
+            parsed.options.configFilePath = configFilePath;
+            cache.setValue(configFilePath, parsed);
+            return parsed;
+        }
+        function removeKey(configFilePath) {
+            cache.removeKey(configFilePath);
+        }
+        return {
+            parseConfigFile: parseConfigFile,
+            removeKey: removeKey
+        };
+    }
+    function newer(date1, date2) {
+        return date2 > date1 ? date2 : date1;
+    }
+    function isDeclarationFile(fileName) {
+        return ts.fileExtensionIs(fileName, ".d.ts" /* Dts */);
+    }
+    function createBuildContext(options) {
+        var invalidatedProjects = createFileMap();
+        var queuedProjects = createFileMap();
+        var missingRoots = ts.createMap();
+        return {
+            options: options,
+            projectStatus: createFileMap(),
+            unchangedOutputs: createFileMap(),
+            invalidatedProjects: invalidatedProjects,
+            missingRoots: missingRoots,
+            queuedProjects: queuedProjects
+        };
+    }
+    ts.createBuildContext = createBuildContext;
+    var buildOpts = [
         {
-            name: "help",
-            shortName: "h",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
+            name: "verbose",
+            shortName: "v",
             category: ts.Diagnostics.Command_line_Options,
-            description: ts.Diagnostics.Print_this_message,
-        },
-        {
-            name: "help",
-            shortName: "?",
+            description: ts.Diagnostics.Enable_verbose_logging,
             type: "boolean"
         },
         {
-            name: "all",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
+            name: "dry",
+            shortName: "d",
             category: ts.Diagnostics.Command_line_Options,
-            description: ts.Diagnostics.Show_all_compiler_options,
+            description: ts.Diagnostics.Show_what_would_be_built_or_deleted_if_specified_with_clean,
+            type: "boolean"
         },
         {
-            name: "version",
-            shortName: "v",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
+            name: "force",
+            shortName: "f",
             category: ts.Diagnostics.Command_line_Options,
-            description: ts.Diagnostics.Print_the_compiler_s_version,
+            description: ts.Diagnostics.Build_all_projects_including_those_that_appear_to_be_up_to_date,
+            type: "boolean"
         },
         {
-            name: "init",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
+            name: "clean",
             category: ts.Diagnostics.Command_line_Options,
-            description: ts.Diagnostics.Initializes_a_TypeScript_project_and_creates_a_tsconfig_json_file,
-        },
-        {
-            name: "project",
-            shortName: "p",
-            type: "string",
-            isFilePath: true,
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Command_line_Options,
-            paramType: ts.Diagnostics.FILE_OR_DIRECTORY,
-            description: ts.Diagnostics.Compile_the_project_given_the_path_to_its_configuration_file_or_to_a_folder_with_a_tsconfig_json,
-        },
-        {
-            name: "pretty",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Command_line_Options,
-            description: ts.Diagnostics.Stylize_errors_and_messages_using_color_and_context_experimental
-        },
-        {
-            name: "preserveWatchOutput",
-            type: "boolean",
-            showInSimplifiedHelpView: false,
-            category: ts.Diagnostics.Command_line_Options,
-            description: ts.Diagnostics.Whether_to_keep_outdated_console_output_in_watch_mode_instead_of_clearing_the_screen,
+            description: ts.Diagnostics.Delete_the_outputs_of_all_projects,
+            type: "boolean"
         },
         {
             name: "watch",
-            shortName: "w",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
             category: ts.Diagnostics.Command_line_Options,
             description: ts.Diagnostics.Watch_input_files,
-        },
-        // Basic
-        {
-            name: "target",
-            shortName: "t",
-            type: ts.createMapFromTemplate({
-                es3: 0 /* ES3 */,
-                es5: 1 /* ES5 */,
-                es6: 2 /* ES2015 */,
-                es2015: 2 /* ES2015 */,
-                es2016: 3 /* ES2016 */,
-                es2017: 4 /* ES2017 */,
-                es2018: 5 /* ES2018 */,
-                esnext: 6 /* ESNext */,
-            }),
-            paramType: ts.Diagnostics.VERSION,
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Specify_ECMAScript_target_version_Colon_ES3_default_ES5_ES2015_ES2016_ES2017_ES2018_or_ESNEXT,
-        },
-        {
-            name: "module",
-            shortName: "m",
-            type: ts.createMapFromTemplate({
-                none: ts.ModuleKind.None,
-                commonjs: ts.ModuleKind.CommonJS,
-                amd: ts.ModuleKind.AMD,
-                system: ts.ModuleKind.System,
-                umd: ts.ModuleKind.UMD,
-                es6: ts.ModuleKind.ES2015,
-                es2015: ts.ModuleKind.ES2015,
-                esnext: ts.ModuleKind.ESNext
-            }),
-            paramType: ts.Diagnostics.KIND,
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Specify_module_code_generation_Colon_none_commonjs_amd_system_umd_es2015_or_ESNext,
-        },
-        {
-            name: "lib",
-            type: "list",
-            element: {
-                name: "lib",
-                type: ts.createMapFromTemplate({
-                    // JavaScript only
-                    "es5": "lib.es5.d.ts",
-                    "es6": "lib.es2015.d.ts",
-                    "es2015": "lib.es2015.d.ts",
-                    "es7": "lib.es2016.d.ts",
-                    "es2016": "lib.es2016.d.ts",
-                    "es2017": "lib.es2017.d.ts",
-                    "es2018": "lib.es2018.d.ts",
-                    "esnext": "lib.esnext.d.ts",
-                    // Host only
-                    "dom": "lib.dom.d.ts",
-                    "dom.iterable": "lib.dom.iterable.d.ts",
-                    "webworker": "lib.webworker.d.ts",
-                    "scripthost": "lib.scripthost.d.ts",
-                    // ES2015 Or ESNext By-feature options
-                    "es2015.core": "lib.es2015.core.d.ts",
-                    "es2015.collection": "lib.es2015.collection.d.ts",
-                    "es2015.generator": "lib.es2015.generator.d.ts",
-                    "es2015.iterable": "lib.es2015.iterable.d.ts",
-                    "es2015.promise": "lib.es2015.promise.d.ts",
-                    "es2015.proxy": "lib.es2015.proxy.d.ts",
-                    "es2015.reflect": "lib.es2015.reflect.d.ts",
-                    "es2015.symbol": "lib.es2015.symbol.d.ts",
-                    "es2015.symbol.wellknown": "lib.es2015.symbol.wellknown.d.ts",
-                    "es2016.array.include": "lib.es2016.array.include.d.ts",
-                    "es2017.object": "lib.es2017.object.d.ts",
-                    "es2017.sharedmemory": "lib.es2017.sharedmemory.d.ts",
-                    "es2017.string": "lib.es2017.string.d.ts",
-                    "es2017.intl": "lib.es2017.intl.d.ts",
-                    "es2017.typedarrays": "lib.es2017.typedarrays.d.ts",
-                    "es2018.intl": "lib.es2018.intl.d.ts",
-                    "es2018.promise": "lib.es2018.promise.d.ts",
-                    "es2018.regexp": "lib.es2018.regexp.d.ts",
-                    "esnext.array": "lib.esnext.array.d.ts",
-                    "esnext.symbol": "lib.esnext.symbol.d.ts",
-                    "esnext.asynciterable": "lib.esnext.asynciterable.d.ts",
-                }),
-            },
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Specify_library_files_to_be_included_in_the_compilation
-        },
-        {
-            name: "allowJs",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Allow_javascript_files_to_be_compiled
-        },
-        {
-            name: "checkJs",
-            type: "boolean",
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Report_errors_in_js_files
-        },
-        {
-            name: "jsx",
-            type: ts.createMapFromTemplate({
-                "preserve": 1 /* Preserve */,
-                "react-native": 3 /* ReactNative */,
-                "react": 2 /* React */
-            }),
-            paramType: ts.Diagnostics.KIND,
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Specify_JSX_code_generation_Colon_preserve_react_native_or_react,
-        },
-        {
-            name: "declaration",
-            shortName: "d",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Generates_corresponding_d_ts_file,
-        },
-        {
-            name: "declarationMap",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Generates_a_sourcemap_for_each_corresponding_d_ts_file,
-        },
-        {
-            name: "emitDeclarationOnly",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Only_emit_d_ts_declaration_files,
-        },
-        {
-            name: "sourceMap",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Generates_corresponding_map_file,
-        },
-        {
-            name: "outFile",
-            type: "string",
-            isFilePath: true,
-            paramType: ts.Diagnostics.FILE,
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Concatenate_and_emit_output_to_single_file,
-        },
-        {
-            name: "outDir",
-            type: "string",
-            isFilePath: true,
-            paramType: ts.Diagnostics.DIRECTORY,
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Redirect_output_structure_to_the_directory,
-        },
-        {
-            name: "rootDir",
-            type: "string",
-            isFilePath: true,
-            paramType: ts.Diagnostics.LOCATION,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Specify_the_root_directory_of_input_files_Use_to_control_the_output_directory_structure_with_outDir,
-        },
-        {
-            name: "composite",
-            type: "boolean",
-            isTSConfigOnly: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Enable_project_compilation,
-        },
-        {
-            name: "removeComments",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Do_not_emit_comments_to_output,
-        },
-        {
-            name: "noEmit",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Do_not_emit_outputs,
-        },
-        {
-            name: "importHelpers",
-            type: "boolean",
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Import_emit_helpers_from_tslib
-        },
-        {
-            name: "downlevelIteration",
-            type: "boolean",
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Provide_full_support_for_iterables_in_for_of_spread_and_destructuring_when_targeting_ES5_or_ES3
-        },
-        {
-            name: "isolatedModules",
-            type: "boolean",
-            category: ts.Diagnostics.Basic_Options,
-            description: ts.Diagnostics.Transpile_each_file_as_a_separate_module_similar_to_ts_transpileModule
-        },
-        // Strict Type Checks
-        {
-            name: "strict",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Strict_Type_Checking_Options,
-            description: ts.Diagnostics.Enable_all_strict_type_checking_options
-        },
-        {
-            name: "noImplicitAny",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Strict_Type_Checking_Options,
-            description: ts.Diagnostics.Raise_error_on_expressions_and_declarations_with_an_implied_any_type,
-        },
-        {
-            name: "strictNullChecks",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Strict_Type_Checking_Options,
-            description: ts.Diagnostics.Enable_strict_null_checks
-        },
-        {
-            name: "strictFunctionTypes",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Strict_Type_Checking_Options,
-            description: ts.Diagnostics.Enable_strict_checking_of_function_types
-        },
-        {
-            name: "strictPropertyInitialization",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Strict_Type_Checking_Options,
-            description: ts.Diagnostics.Enable_strict_checking_of_property_initialization_in_classes
-        },
-        {
-            name: "noImplicitThis",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Strict_Type_Checking_Options,
-            description: ts.Diagnostics.Raise_error_on_this_expressions_with_an_implied_any_type,
-        },
-        {
-            name: "alwaysStrict",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Strict_Type_Checking_Options,
-            description: ts.Diagnostics.Parse_in_strict_mode_and_emit_use_strict_for_each_source_file
-        },
-        // Additional Checks
-        {
-            name: "noUnusedLocals",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Additional_Checks,
-            description: ts.Diagnostics.Report_errors_on_unused_locals,
-        },
-        {
-            name: "noUnusedParameters",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Additional_Checks,
-            description: ts.Diagnostics.Report_errors_on_unused_parameters,
-        },
-        {
-            name: "noImplicitReturns",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Additional_Checks,
-            description: ts.Diagnostics.Report_error_when_not_all_code_paths_in_function_return_a_value
-        },
-        {
-            name: "noFallthroughCasesInSwitch",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Additional_Checks,
-            description: ts.Diagnostics.Report_errors_for_fallthrough_cases_in_switch_statement
-        },
-        // Module Resolution
-        {
-            name: "moduleResolution",
-            type: ts.createMapFromTemplate({
-                node: ts.ModuleResolutionKind.NodeJs,
-                classic: ts.ModuleResolutionKind.Classic,
-            }),
-            paramType: ts.Diagnostics.STRATEGY,
-            category: ts.Diagnostics.Module_Resolution_Options,
-            description: ts.Diagnostics.Specify_module_resolution_strategy_Colon_node_Node_js_or_classic_TypeScript_pre_1_6,
-        },
-        {
-            name: "baseUrl",
-            type: "string",
-            isFilePath: true,
-            category: ts.Diagnostics.Module_Resolution_Options,
-            description: ts.Diagnostics.Base_directory_to_resolve_non_absolute_module_names
-        },
-        {
-            // this option can only be specified in tsconfig.json
-            // use type = object to copy the value as-is
-            name: "paths",
-            type: "object",
-            isTSConfigOnly: true,
-            category: ts.Diagnostics.Module_Resolution_Options,
-            description: ts.Diagnostics.A_series_of_entries_which_re_map_imports_to_lookup_locations_relative_to_the_baseUrl
-        },
-        {
-            // this option can only be specified in tsconfig.json
-            // use type = object to copy the value as-is
-            name: "rootDirs",
-            type: "list",
-            isTSConfigOnly: true,
-            element: {
-                name: "rootDirs",
-                type: "string",
-                isFilePath: true
-            },
-            category: ts.Diagnostics.Module_Resolution_Options,
-            description: ts.Diagnostics.List_of_root_folders_whose_combined_content_represents_the_structure_of_the_project_at_runtime
-        },
-        {
-            name: "typeRoots",
-            type: "list",
-            element: {
-                name: "typeRoots",
-                type: "string",
-                isFilePath: true
-            },
-            category: ts.Diagnostics.Module_Resolution_Options,
-            description: ts.Diagnostics.List_of_folders_to_include_type_definitions_from
-        },
-        {
-            name: "types",
-            type: "list",
-            element: {
-                name: "types",
-                type: "string"
-            },
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Module_Resolution_Options,
-            description: ts.Diagnostics.Type_declaration_files_to_be_included_in_compilation
-        },
-        {
-            name: "allowSyntheticDefaultImports",
-            type: "boolean",
-            category: ts.Diagnostics.Module_Resolution_Options,
-            description: ts.Diagnostics.Allow_default_imports_from_modules_with_no_default_export_This_does_not_affect_code_emit_just_typechecking
-        },
-        {
-            name: "esModuleInterop",
-            type: "boolean",
-            showInSimplifiedHelpView: true,
-            category: ts.Diagnostics.Module_Resolution_Options,
-            description: ts.Diagnostics.Enables_emit_interoperability_between_CommonJS_and_ES_Modules_via_creation_of_namespace_objects_for_all_imports_Implies_allowSyntheticDefaultImports
-        },
-        {
-            name: "preserveSymlinks",
-            type: "boolean",
-            category: ts.Diagnostics.Module_Resolution_Options,
-            description: ts.Diagnostics.Do_not_resolve_the_real_path_of_symlinks,
-        },
-        // Source Maps
-        {
-            name: "sourceRoot",
-            type: "string",
-            isFilePath: true,
-            paramType: ts.Diagnostics.LOCATION,
-            category: ts.Diagnostics.Source_Map_Options,
-            description: ts.Diagnostics.Specify_the_location_where_debugger_should_locate_TypeScript_files_instead_of_source_locations,
-        },
-        {
-            name: "mapRoot",
-            type: "string",
-            isFilePath: true,
-            paramType: ts.Diagnostics.LOCATION,
-            category: ts.Diagnostics.Source_Map_Options,
-            description: ts.Diagnostics.Specify_the_location_where_debugger_should_locate_map_files_instead_of_generated_locations,
-        },
-        {
-            name: "inlineSourceMap",
-            type: "boolean",
-            category: ts.Diagnostics.Source_Map_Options,
-            description: ts.Diagnostics.Emit_a_single_file_with_source_maps_instead_of_having_a_separate_file
-        },
-        {
-            name: "inlineSources",
-            type: "boolean",
-            category: ts.Diagnostics.Source_Map_Options,
-            description: ts.Diagnostics.Emit_the_source_alongside_the_sourcemaps_within_a_single_file_requires_inlineSourceMap_or_sourceMap_to_be_set
-        },
-        // Experimental
-        {
-            name: "experimentalDecorators",
-            type: "boolean",
-            category: ts.Diagnostics.Experimental_Options,
-            description: ts.Diagnostics.Enables_experimental_support_for_ES7_decorators
-        },
-        {
-            name: "emitDecoratorMetadata",
-            type: "boolean",
-            category: ts.Diagnostics.Experimental_Options,
-            description: ts.Diagnostics.Enables_experimental_support_for_emitting_type_metadata_for_decorators
-        },
-        // Advanced
-        {
-            name: "jsxFactory",
-            type: "string",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Specify_the_JSX_factory_function_to_use_when_targeting_react_JSX_emit_e_g_React_createElement_or_h
-        },
-        {
-            name: "diagnostics",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Show_diagnostic_information
-        },
-        {
-            name: "extendedDiagnostics",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Show_verbose_diagnostic_information
-        },
-        {
-            name: "traceResolution",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Enable_tracing_of_the_name_resolution_process
-        },
-        {
-            name: "resolveJsonModule",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Include_modules_imported_with_json_extension
-        },
-        {
-            name: "listFiles",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Print_names_of_files_part_of_the_compilation
-        },
-        {
-            name: "listEmittedFiles",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Print_names_of_generated_files_part_of_the_compilation
-        },
-        {
-            name: "out",
-            type: "string",
-            isFilePath: false,
-            // for correct behaviour, please use outFile
-            category: ts.Diagnostics.Advanced_Options,
-            paramType: ts.Diagnostics.FILE,
-            description: ts.Diagnostics.Deprecated_Use_outFile_instead_Concatenate_and_emit_output_to_single_file,
-        },
-        {
-            name: "reactNamespace",
-            type: "string",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Deprecated_Use_jsxFactory_instead_Specify_the_object_invoked_for_createElement_when_targeting_react_JSX_emit
-        },
-        {
-            name: "skipDefaultLibCheck",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Deprecated_Use_skipLibCheck_instead_Skip_type_checking_of_default_library_declaration_files
-        },
-        {
-            name: "charset",
-            type: "string",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.The_character_set_of_the_input_files
-        },
-        {
-            name: "emitBOM",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Emit_a_UTF_8_Byte_Order_Mark_BOM_in_the_beginning_of_output_files
-        },
-        {
-            name: "locale",
-            type: "string",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.The_locale_used_when_displaying_messages_to_the_user_e_g_en_us
-        },
-        {
-            name: "newLine",
-            type: ts.createMapFromTemplate({
-                crlf: 0 /* CarriageReturnLineFeed */,
-                lf: 1 /* LineFeed */
-            }),
-            paramType: ts.Diagnostics.NEWLINE,
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Specify_the_end_of_line_sequence_to_be_used_when_emitting_files_Colon_CRLF_dos_or_LF_unix,
-        },
-        {
-            name: "noErrorTruncation",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Do_not_truncate_error_messages
-        },
-        {
-            name: "noLib",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Do_not_include_the_default_library_file_lib_d_ts
-        },
-        {
-            name: "noResolve",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Do_not_add_triple_slash_references_or_imported_modules_to_the_list_of_compiled_files
-        },
-        {
-            name: "stripInternal",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Do_not_emit_declarations_for_code_that_has_an_internal_annotation,
-        },
-        {
-            name: "disableSizeLimit",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Disable_size_limitations_on_JavaScript_projects
-        },
-        {
-            name: "noImplicitUseStrict",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Do_not_emit_use_strict_directives_in_module_output
-        },
-        {
-            name: "noEmitHelpers",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Do_not_generate_custom_helper_functions_like_extends_in_compiled_output
-        },
-        {
-            name: "noEmitOnError",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Do_not_emit_outputs_if_any_errors_were_reported,
-        },
-        {
-            name: "preserveConstEnums",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Do_not_erase_const_enum_declarations_in_generated_code
-        },
-        {
-            name: "declarationDir",
-            type: "string",
-            isFilePath: true,
-            paramType: ts.Diagnostics.DIRECTORY,
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Output_directory_for_generated_declaration_files
-        },
-        {
-            name: "skipLibCheck",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Skip_type_checking_of_declaration_files,
-        },
-        {
-            name: "allowUnusedLabels",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Do_not_report_errors_on_unused_labels
-        },
-        {
-            name: "allowUnreachableCode",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Do_not_report_errors_on_unreachable_code
-        },
-        {
-            name: "suppressExcessPropertyErrors",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Suppress_excess_property_checks_for_object_literals,
-        },
-        {
-            name: "suppressImplicitAnyIndexErrors",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Suppress_noImplicitAny_errors_for_indexing_objects_lacking_index_signatures,
-        },
-        {
-            name: "forceConsistentCasingInFileNames",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Disallow_inconsistently_cased_references_to_the_same_file
-        },
-        {
-            name: "maxNodeModuleJsDepth",
-            type: "number",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.The_maximum_dependency_depth_to_search_under_node_modules_and_load_JavaScript_files
-        },
-        {
-            name: "noStrictGenericChecks",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Disable_strict_checking_of_generic_signatures_in_function_types,
-        },
-        {
-            name: "keyofStringsOnly",
-            type: "boolean",
-            category: ts.Diagnostics.Advanced_Options,
-            description: ts.Diagnostics.Resolve_keyof_to_string_valued_property_names_only_no_numbers_or_symbols,
-        },
-        {
-            // A list of plugins to load in the language service
-            name: "plugins",
-            type: "list",
-            isTSConfigOnly: true,
-            element: {
-                name: "plugin",
-                type: "object"
-            },
-            description: ts.Diagnostics.List_of_language_service_plugins
+            type: "boolean"
         }
     ];
-    /* @internal */
-    ts.typeAcquisitionDeclarations = [
-        {
-            /* @deprecated typingOptions.enableAutoDiscovery
-             * Use typeAcquisition.enable instead.
-             */
-            name: "enableAutoDiscovery",
-            type: "boolean",
-        },
-        {
-            name: "enable",
-            type: "boolean",
-        },
-        {
-            name: "include",
-            type: "list",
-            element: {
-                name: "include",
-                type: "string"
+    function performBuild(args, compilerHost, buildHost, system) {
+        var verbose = false;
+        var dry = false;
+        var force = false;
+        var clean = false;
+        var watch = false;
+        var projects = [];
+        for (var _i = 0, args_3 = args; _i < args_3.length; _i++) {
+            var arg = args_3[_i];
+            switch (arg.toLowerCase()) {
+                case "-v":
+                case "--verbose":
+                    verbose = true;
+                    continue;
+                case "-d":
+                case "--dry":
+                    dry = true;
+                    continue;
+                case "-f":
+                case "--force":
+                    force = true;
+                    continue;
+                case "--clean":
+                    clean = true;
+                    continue;
+                case "--watch":
+                case "-w":
+                    watch = true;
+                    continue;
+                case "--?":
+                case "-?":
+                case "--help":
+                    return ts.printHelp(buildOpts, "--build ");
             }
-        },
-        {
-            name: "exclude",
-            type: "list",
-            element: {
-                name: "exclude",
-                type: "string"
+            // Not a flag, parse as filename
+            addProject(arg);
+        }
+        // Nonsensical combinations
+        if (clean && force) {
+            return buildHost.error(ts.Diagnostics.Options_0_and_1_cannot_be_combined, "clean", "force");
+        }
+        if (clean && verbose) {
+            return buildHost.error(ts.Diagnostics.Options_0_and_1_cannot_be_combined, "clean", "verbose");
+        }
+        if (clean && watch) {
+            return buildHost.error(ts.Diagnostics.Options_0_and_1_cannot_be_combined, "clean", "watch");
+        }
+        if (watch && dry) {
+            return buildHost.error(ts.Diagnostics.Options_0_and_1_cannot_be_combined, "watch", "dry");
+        }
+        if (projects.length === 0) {
+            // tsc -b invoked with no extra arguments; act as if invoked with "tsc -b ."
+            addProject(".");
+        }
+        var builder = createSolutionBuilder(compilerHost, buildHost, projects, { dry: dry, force: force, verbose: verbose }, system);
+        if (clean) {
+            builder.cleanAllProjects();
+        }
+        else {
+            builder.buildAllProjects();
+        }
+        if (watch) {
+            return builder.startWatching();
+        }
+        function addProject(projectSpecification) {
+            var fileName = ts.resolvePath(compilerHost.getCurrentDirectory(), projectSpecification);
+            var refPath = ts.resolveProjectReferencePath(compilerHost, { path: fileName });
+            if (!refPath) {
+                return buildHost.error(ts.Diagnostics.File_0_does_not_exist, projectSpecification);
             }
-        }
-    ];
-    /* @internal */
-    ts.defaultInitCompilerOptions = {
-        module: ts.ModuleKind.CommonJS,
-        target: 1 /* ES5 */,
-        strict: true,
-        esModuleInterop: true
-    };
-    var optionNameMapCache;
-    /* @internal */
-    function convertEnableAutoDiscoveryToEnable(typeAcquisition) {
-        // Convert deprecated typingOptions.enableAutoDiscovery to typeAcquisition.enable
-        if (typeAcquisition && typeAcquisition.enableAutoDiscovery !== undefined && typeAcquisition.enable === undefined) {
-            return {
-                enable: typeAcquisition.enableAutoDiscovery,
-                include: typeAcquisition.include || [],
-                exclude: typeAcquisition.exclude || []
-            };
-        }
-        return typeAcquisition;
-    }
-    ts.convertEnableAutoDiscoveryToEnable = convertEnableAutoDiscoveryToEnable;
-    function getOptionNameMap() {
-        if (optionNameMapCache) {
-            return optionNameMapCache;
-        }
-        var optionNameMap = ts.createMap();
-        var shortOptionNames = ts.createMap();
-        ts.forEach(ts.optionDeclarations, function (option) {
-            optionNameMap.set(option.name.toLowerCase(), option);
-            if (option.shortName) {
-                shortOptionNames.set(option.shortName, option.name);
+            if (!compilerHost.fileExists(refPath)) {
+                return buildHost.error(ts.Diagnostics.File_0_does_not_exist, fileName);
             }
-        });
-        optionNameMapCache = { optionNameMap: optionNameMap, shortOptionNames: shortOptionNames };
-        return optionNameMapCache;
-    }
-    /* @internal */
-    function createCompilerDiagnosticForInvalidCustomType(opt) {
-        return createDiagnosticForInvalidCustomType(opt, ts.createCompilerDiagnostic);
-    }
-    ts.createCompilerDiagnosticForInvalidCustomType = createCompilerDiagnosticForInvalidCustomType;
-    function createDiagnosticForInvalidCustomType(opt, createDiagnostic) {
-        var namesOfType = ts.arrayFrom(opt.type.keys()).map(function (key) { return "'" + key + "'"; }).join(", ");
-        return createDiagnostic(ts.Diagnostics.Argument_for_0_option_must_be_Colon_1, "--" + opt.name, namesOfType);
-    }
-    /* @internal */
-    function parseCustomTypeOption(opt, value, errors) {
-        return convertJsonOptionOfCustomType(opt, trimString(value || ""), errors);
-    }
-    ts.parseCustomTypeOption = parseCustomTypeOption;
-    /* @internal */
-    function parseListTypeOption(opt, value, errors) {
-        if (value === void 0) { value = ""; }
-        value = trimString(value);
-        if (ts.startsWith(value, "-")) {
-            return undefined;
-        }
-        if (value === "") {
-            return [];
-        }
-        var values = value.split(",");
-        switch (opt.element.type) {
-            case "number":
-                return ts.map(values, parseInt);
-            case "string":
-                return ts.map(values, function (v) { return v || ""; });
-            default:
-                return ts.mapDefined(values, function (v) { return parseCustomTypeOption(opt.element, v, errors); });
+            projects.push(refPath);
         }
     }
-    ts.parseListTypeOption = parseListTypeOption;
-    function parseCommandLine(commandLine, readFile) {
-        var options = {};
-        var fileNames = [];
-        var projectReferences = undefined;
-        var errors = [];
-        parseStrings(commandLine);
+    ts.performBuild = performBuild;
+    /**
+     * A SolutionBuilder has an immutable set of rootNames that are the "entry point" projects, but
+     * can dynamically add/remove other projects based on changes on the rootNames' references
+     */
+    function createSolutionBuilder(compilerHost, buildHost, rootNames, defaultOptions, system) {
+        if (!compilerHost.getModifiedTime || !compilerHost.setModifiedTime) {
+            throw new Error("Host must support timestamp APIs");
+        }
+        var configFileCache = createConfigFileCache(compilerHost);
+        var context = createBuildContext(defaultOptions);
+        var existingWatchersForWildcards = ts.createMap();
         return {
-            options: options,
-            fileNames: fileNames,
-            projectReferences: projectReferences,
-            errors: errors
+            buildAllProjects: buildAllProjects,
+            getUpToDateStatus: getUpToDateStatus,
+            getUpToDateStatusOfFile: getUpToDateStatusOfFile,
+            cleanAllProjects: cleanAllProjects,
+            resetBuildContext: resetBuildContext,
+            getBuildGraph: getBuildGraph,
+            invalidateProject: invalidateProject,
+            buildInvalidatedProjects: buildInvalidatedProjects,
+            buildDependentInvalidatedProjects: buildDependentInvalidatedProjects,
+            resolveProjectName: resolveProjectName,
+            startWatching: startWatching
         };
-        function parseStrings(args) {
-            var i = 0;
-            while (i < args.length) {
-                var s = args[i];
-                i++;
-                if (s.charCodeAt(0) === 64 /* at */) {
-                    parseResponseFile(s.slice(1));
-                }
-                else if (s.charCodeAt(0) === 45 /* minus */) {
-                    var opt = getOptionFromName(s.slice(s.charCodeAt(1) === 45 /* minus */ ? 2 : 1), /*allowShort*/ true);
-                    if (opt) {
-                        if (opt.isTSConfigOnly) {
-                            errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Option_0_can_only_be_specified_in_tsconfig_json_file, opt.name));
-                        }
-                        else {
-                            // Check to see if no argument was provided (e.g. "--locale" is the last command-line argument).
-                            if (!args[i] && opt.type !== "boolean") {
-                                errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Compiler_option_0_expects_an_argument, opt.name));
-                            }
-                            switch (opt.type) {
-                                case "number":
-                                    options[opt.name] = parseInt(args[i]);
-                                    i++;
-                                    break;
-                                case "boolean":
-                                    // boolean flag has optional value true, false, others
-                                    var optValue = args[i];
-                                    options[opt.name] = optValue !== "false";
-                                    // consume next argument as boolean flag value
-                                    if (optValue === "false" || optValue === "true") {
-                                        i++;
-                                    }
-                                    break;
-                                case "string":
-                                    options[opt.name] = args[i] || "";
-                                    i++;
-                                    break;
-                                case "list":
-                                    var result = parseListTypeOption(opt, args[i], errors);
-                                    options[opt.name] = result || [];
-                                    if (result) {
-                                        i++;
-                                    }
-                                    break;
-                                // If not a primitive, the possible types are specified in what is effectively a map of options.
-                                default:
-                                    options[opt.name] = parseCustomTypeOption(opt, args[i], errors);
-                                    i++;
-                                    break;
-                            }
-                        }
-                    }
-                    else {
-                        errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Unknown_compiler_option_0, s));
-                    }
-                }
-                else {
-                    fileNames.push(s);
-                }
-            }
-        }
-        function parseResponseFile(fileName) {
-            var text = readFile ? readFile(fileName) : ts.sys.readFile(fileName);
-            if (!text) {
-                errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.File_0_not_found, fileName));
+        function startWatching() {
+            if (!system)
+                throw new Error("System host must be provided if using --watch");
+            if (!system.watchFile || !system.watchDirectory || !system.setTimeout)
+                throw new Error("System host must support watchFile / watchDirectory / setTimeout if using --watch");
+            var graph = getGlobalDependencyGraph();
+            if (!graph.buildQueue) {
+                // Everything is broken - we don't even know what to watch. Give up.
                 return;
             }
-            var args = [];
-            var pos = 0;
-            while (true) {
-                while (pos < text.length && text.charCodeAt(pos) <= 32 /* space */)
-                    pos++;
-                if (pos >= text.length)
-                    break;
-                var start = pos;
-                if (text.charCodeAt(start) === 34 /* doubleQuote */) {
-                    pos++;
-                    while (pos < text.length && text.charCodeAt(pos) !== 34 /* doubleQuote */)
-                        pos++;
-                    if (pos < text.length) {
-                        args.push(text.substring(start + 1, pos));
-                        pos++;
-                    }
-                    else {
-                        errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Unterminated_quoted_string_in_response_file_0, fileName));
-                    }
-                }
-                else {
-                    while (text.charCodeAt(pos) > 32 /* space */)
-                        pos++;
-                    args.push(text.substring(start, pos));
-                }
-            }
-            parseStrings(args);
-        }
-    }
-    ts.parseCommandLine = parseCommandLine;
-    /** @internal */
-    function getOptionFromName(optionName, allowShort) {
-        if (allowShort === void 0) { allowShort = false; }
-        optionName = optionName.toLowerCase();
-        var _a = getOptionNameMap(), optionNameMap = _a.optionNameMap, shortOptionNames = _a.shortOptionNames;
-        // Try to translate short option names to their full equivalents.
-        if (allowShort) {
-            var short = shortOptionNames.get(optionName);
-            if (short !== undefined) {
-                optionName = short;
-            }
-        }
-        return optionNameMap.get(optionName);
-    }
-    ts.getOptionFromName = getOptionFromName;
-    /**
-     * Reads the config file, reports errors if any and exits if the config file cannot be found
-     */
-    function getParsedCommandLineOfConfigFile(configFileName, optionsToExtend, host) {
-        var configFileText;
-        try {
-            configFileText = host.readFile(configFileName);
-        }
-        catch (e) {
-            var error = ts.createCompilerDiagnostic(ts.Diagnostics.Cannot_read_file_0_Colon_1, configFileName, e.message);
-            host.onUnRecoverableConfigFileDiagnostic(error);
-            return undefined;
-        }
-        if (!configFileText) {
-            var error = ts.createCompilerDiagnostic(ts.Diagnostics.File_0_not_found, configFileName);
-            host.onUnRecoverableConfigFileDiagnostic(error);
-            return undefined;
-        }
-        var result = ts.parseJsonText(configFileName, configFileText);
-        var cwd = host.getCurrentDirectory();
-        return parseJsonSourceFileConfigFileContent(result, host, ts.getNormalizedAbsolutePath(ts.getDirectoryPath(configFileName), cwd), optionsToExtend, ts.getNormalizedAbsolutePath(configFileName, cwd));
-    }
-    ts.getParsedCommandLineOfConfigFile = getParsedCommandLineOfConfigFile;
-    /**
-     * Read tsconfig.json file
-     * @param fileName The path to the config file
-     */
-    function readConfigFile(fileName, readFile) {
-        var textOrDiagnostic = tryReadFile(fileName, readFile);
-        return ts.isString(textOrDiagnostic) ? parseConfigFileTextToJson(fileName, textOrDiagnostic) : { config: {}, error: textOrDiagnostic };
-    }
-    ts.readConfigFile = readConfigFile;
-    /**
-     * Parse the text of the tsconfig.json file
-     * @param fileName The path to the config file
-     * @param jsonText The text of the config file
-     */
-    function parseConfigFileTextToJson(fileName, jsonText) {
-        var jsonSourceFile = ts.parseJsonText(fileName, jsonText);
-        return {
-            config: convertToObject(jsonSourceFile, jsonSourceFile.parseDiagnostics),
-            error: jsonSourceFile.parseDiagnostics.length ? jsonSourceFile.parseDiagnostics[0] : undefined
-        };
-    }
-    ts.parseConfigFileTextToJson = parseConfigFileTextToJson;
-    /**
-     * Read tsconfig.json file
-     * @param fileName The path to the config file
-     */
-    function readJsonConfigFile(fileName, readFile) {
-        var textOrDiagnostic = tryReadFile(fileName, readFile);
-        return ts.isString(textOrDiagnostic) ? ts.parseJsonText(fileName, textOrDiagnostic) : { parseDiagnostics: [textOrDiagnostic] };
-    }
-    ts.readJsonConfigFile = readJsonConfigFile;
-    function tryReadFile(fileName, readFile) {
-        var text;
-        try {
-            text = readFile(fileName);
-        }
-        catch (e) {
-            return ts.createCompilerDiagnostic(ts.Diagnostics.Cannot_read_file_0_Colon_1, fileName, e.message);
-        }
-        return text === undefined ? ts.createCompilerDiagnostic(ts.Diagnostics.The_specified_path_does_not_exist_Colon_0, fileName) : text;
-    }
-    function commandLineOptionsToMap(options) {
-        return ts.arrayToMap(options, function (option) { return option.name; });
-    }
-    var _tsconfigRootOptions;
-    function getTsconfigRootOptionsMap() {
-        if (_tsconfigRootOptions === undefined) {
-            _tsconfigRootOptions = {
-                name: undefined,
-                type: "object",
-                elementOptions: commandLineOptionsToMap([
-                    {
-                        name: "compilerOptions",
-                        type: "object",
-                        elementOptions: commandLineOptionsToMap(ts.optionDeclarations),
-                        extraKeyDiagnosticMessage: ts.Diagnostics.Unknown_compiler_option_0
-                    },
-                    {
-                        name: "typingOptions",
-                        type: "object",
-                        elementOptions: commandLineOptionsToMap(ts.typeAcquisitionDeclarations),
-                        extraKeyDiagnosticMessage: ts.Diagnostics.Unknown_type_acquisition_option_0
-                    },
-                    {
-                        name: "typeAcquisition",
-                        type: "object",
-                        elementOptions: commandLineOptionsToMap(ts.typeAcquisitionDeclarations),
-                        extraKeyDiagnosticMessage: ts.Diagnostics.Unknown_type_acquisition_option_0
-                    },
-                    {
-                        name: "extends",
-                        type: "string"
-                    },
-                    {
-                        name: "references",
-                        type: "list",
-                        element: {
-                            name: "references",
-                            type: "object"
-                        }
-                    },
-                    {
-                        name: "files",
-                        type: "list",
-                        element: {
-                            name: "files",
-                            type: "string"
-                        }
-                    },
-                    {
-                        name: "include",
-                        type: "list",
-                        element: {
-                            name: "include",
-                            type: "string"
-                        }
-                    },
-                    {
-                        name: "exclude",
-                        type: "list",
-                        element: {
-                            name: "exclude",
-                            type: "string"
-                        }
-                    },
-                    ts.compileOnSaveCommandLineOption
-                ])
-            };
-        }
-        return _tsconfigRootOptions;
-    }
-    /**
-     * Convert the json syntax tree into the json value
-     */
-    function convertToObject(sourceFile, errors) {
-        return convertToObjectWorker(sourceFile, errors, /*returnValue*/ true, /*knownRootOptions*/ undefined, /*jsonConversionNotifier*/ undefined);
-    }
-    ts.convertToObject = convertToObject;
-    /**
-     * Convert the json syntax tree into the json value and report errors
-     * This returns the json value (apart from checking errors) only if returnValue provided is true.
-     * Otherwise it just checks the errors and returns undefined
-     */
-    /*@internal*/
-    function convertToObjectWorker(sourceFile, errors, returnValue, knownRootOptions, jsonConversionNotifier) {
-        if (!sourceFile.statements.length) {
-            return returnValue ? {} : undefined;
-        }
-        return convertPropertyValueToJson(sourceFile.statements[0].expression, knownRootOptions);
-        function isRootOptionMap(knownOptions) {
-            return knownRootOptions && knownRootOptions.elementOptions === knownOptions;
-        }
-        function convertObjectLiteralExpressionToJson(node, knownOptions, extraKeyDiagnosticMessage, parentOption) {
-            var result = returnValue ? {} : undefined;
-            for (var _i = 0, _a = node.properties; _i < _a.length; _i++) {
-                var element = _a[_i];
-                if (element.kind !== 270 /* PropertyAssignment */) {
-                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, element, ts.Diagnostics.Property_assignment_expected));
-                    continue;
-                }
-                if (element.questionToken) {
-                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, element.questionToken, ts.Diagnostics._0_can_only_be_used_in_a_ts_file, "?"));
-                }
-                if (!isDoubleQuotedString(element.name)) {
-                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, element.name, ts.Diagnostics.String_literal_with_double_quotes_expected));
-                }
-                var keyText = ts.unescapeLeadingUnderscores(ts.getTextOfPropertyName(element.name));
-                var option = knownOptions ? knownOptions.get(keyText) : undefined;
-                if (extraKeyDiagnosticMessage && !option) {
-                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, element.name, extraKeyDiagnosticMessage, keyText));
-                }
-                var value = convertPropertyValueToJson(element.initializer, option);
-                if (typeof keyText !== "undefined") {
-                    if (returnValue) {
-                        result[keyText] = value;
-                    }
-                    // Notify key value set, if user asked for it
-                    if (jsonConversionNotifier &&
-                        // Current callbacks are only on known parent option or if we are setting values in the root
-                        (parentOption || isRootOptionMap(knownOptions))) {
-                        var isValidOptionValue = isCompilerOptionsValue(option, value);
-                        if (parentOption) {
-                            if (isValidOptionValue) {
-                                // Notify option set in the parent if its a valid option value
-                                jsonConversionNotifier.onSetValidOptionKeyValueInParent(parentOption, option, value);
-                            }
-                        }
-                        else if (isRootOptionMap(knownOptions)) {
-                            if (isValidOptionValue) {
-                                // Notify about the valid root key value being set
-                                jsonConversionNotifier.onSetValidOptionKeyValueInRoot(keyText, element.name, value, element.initializer);
-                            }
-                            else if (!option) {
-                                // Notify about the unknown root key value being set
-                                jsonConversionNotifier.onSetUnknownOptionKeyValueInRoot(keyText, element.name, value, element.initializer);
-                            }
-                        }
-                    }
-                }
-            }
-            return result;
-        }
-        function convertArrayLiteralExpressionToJson(elements, elementOption) {
-            return (returnValue ? elements.map : elements.forEach).call(elements, function (element) { return convertPropertyValueToJson(element, elementOption); });
-        }
-        function convertPropertyValueToJson(valueExpression, option) {
-            switch (valueExpression.kind) {
-                case 101 /* TrueKeyword */:
-                    reportInvalidOptionValue(option && option.type !== "boolean");
-                    return true;
-                case 86 /* FalseKeyword */:
-                    reportInvalidOptionValue(option && option.type !== "boolean");
-                    return false;
-                case 95 /* NullKeyword */:
-                    reportInvalidOptionValue(option && option.name === "extends"); // "extends" is the only option we don't allow null/undefined for
-                    return null; // tslint:disable-line:no-null-keyword
-                case 9 /* StringLiteral */:
-                    if (!isDoubleQuotedString(valueExpression)) {
-                        errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, valueExpression, ts.Diagnostics.String_literal_with_double_quotes_expected));
-                    }
-                    reportInvalidOptionValue(option && (ts.isString(option.type) && option.type !== "string"));
-                    var text = valueExpression.text;
-                    if (option && !ts.isString(option.type)) {
-                        var customOption = option;
-                        // Validate custom option type
-                        if (!customOption.type.has(text.toLowerCase())) {
-                            errors.push(createDiagnosticForInvalidCustomType(customOption, function (message, arg0, arg1) { return ts.createDiagnosticForNodeInSourceFile(sourceFile, valueExpression, message, arg0, arg1); }));
-                        }
-                    }
-                    return text;
-                case 8 /* NumericLiteral */:
-                    reportInvalidOptionValue(option && option.type !== "number");
-                    return Number(valueExpression.text);
-                case 198 /* PrefixUnaryExpression */:
-                    if (valueExpression.operator !== 38 /* MinusToken */ || valueExpression.operand.kind !== 8 /* NumericLiteral */) {
-                        break; // not valid JSON syntax
-                    }
-                    reportInvalidOptionValue(option && option.type !== "number");
-                    return -Number(valueExpression.operand.text);
-                case 184 /* ObjectLiteralExpression */:
-                    reportInvalidOptionValue(option && option.type !== "object");
-                    var objectLiteralExpression = valueExpression;
-                    // Currently having element option declaration in the tsconfig with type "object"
-                    // determines if it needs onSetValidOptionKeyValueInParent callback or not
-                    // At moment there are only "compilerOptions", "typeAcquisition" and "typingOptions"
-                    // that satifies it and need it to modify options set in them (for normalizing file paths)
-                    // vs what we set in the json
-                    // If need arises, we can modify this interface and callbacks as needed
-                    if (option) {
-                        var _a = option, elementOptions = _a.elementOptions, extraKeyDiagnosticMessage = _a.extraKeyDiagnosticMessage, optionName = _a.name;
-                        return convertObjectLiteralExpressionToJson(objectLiteralExpression, elementOptions, extraKeyDiagnosticMessage, optionName);
-                    }
-                    else {
-                        return convertObjectLiteralExpressionToJson(objectLiteralExpression, /* knownOptions*/ undefined, 
-                        /*extraKeyDiagnosticMessage */ undefined, /*parentOption*/ undefined);
-                    }
-                case 183 /* ArrayLiteralExpression */:
-                    reportInvalidOptionValue(option && option.type !== "list");
-                    return convertArrayLiteralExpressionToJson(valueExpression.elements, option && option.element);
-            }
-            // Not in expected format
-            if (option) {
-                reportInvalidOptionValue(/*isError*/ true);
-            }
-            else {
-                errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, valueExpression, ts.Diagnostics.Property_value_can_only_be_string_literal_numeric_literal_true_false_null_object_literal_or_array_literal));
-            }
-            return undefined;
-            function reportInvalidOptionValue(isError) {
-                if (isError) {
-                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, valueExpression, ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, option.name, getCompilerOptionValueTypeString(option)));
-                }
-            }
-        }
-        function isDoubleQuotedString(node) {
-            return ts.isStringLiteral(node) && ts.isStringDoubleQuoted(node, sourceFile);
-        }
-    }
-    ts.convertToObjectWorker = convertToObjectWorker;
-    function getCompilerOptionValueTypeString(option) {
-        return option.type === "list" ?
-            "Array" :
-            ts.isString(option.type) ? option.type : "string";
-    }
-    function isCompilerOptionsValue(option, value) {
-        if (option) {
-            if (isNullOrUndefined(value))
-                return true; // All options are undefinable/nullable
-            if (option.type === "list") {
-                return ts.isArray(value);
-            }
-            var expectedType = ts.isString(option.type) ? option.type : "string";
-            return typeof value === expectedType;
-        }
-        return false;
-    }
-    /**
-     * Generate tsconfig configuration when running command line "--init"
-     * @param options commandlineOptions to be generated into tsconfig.json
-     * @param fileNames array of filenames to be generated into tsconfig.json
-     */
-    /* @internal */
-    function generateTSConfig(options, fileNames, newLine) {
-        var compilerOptions = ts.extend(options, ts.defaultInitCompilerOptions);
-        var compilerOptionsMap = serializeCompilerOptions(compilerOptions);
-        return writeConfigurations();
-        function getCustomTypeMapOfCommandLineOption(optionDefinition) {
-            if (optionDefinition.type === "string" || optionDefinition.type === "number" || optionDefinition.type === "boolean") {
-                // this is of a type CommandLineOptionOfPrimitiveType
-                return undefined;
-            }
-            else if (optionDefinition.type === "list") {
-                return getCustomTypeMapOfCommandLineOption(optionDefinition.element);
-            }
-            else {
-                return optionDefinition.type;
-            }
-        }
-        function getNameOfCompilerOptionValue(value, customTypeMap) {
-            // There is a typeMap associated with this command-line option so use it to map value back to its name
-            return ts.forEachEntry(customTypeMap, function (mapValue, key) {
-                if (mapValue === value) {
-                    return key;
-                }
-            });
-        }
-        function serializeCompilerOptions(options) {
-            var result = ts.createMap();
-            var optionsNameMap = getOptionNameMap().optionNameMap;
-            var _loop_11 = function (name) {
-                if (ts.hasProperty(options, name)) {
-                    // tsconfig only options cannot be specified via command line,
-                    // so we can assume that only types that can appear here string | number | boolean
-                    if (optionsNameMap.has(name) && optionsNameMap.get(name).category === ts.Diagnostics.Command_line_Options) {
-                        return "continue";
-                    }
-                    var value = options[name];
-                    var optionDefinition = optionsNameMap.get(name.toLowerCase());
-                    if (optionDefinition) {
-                        var customTypeMap_1 = getCustomTypeMapOfCommandLineOption(optionDefinition);
-                        if (!customTypeMap_1) {
-                            // There is no map associated with this compiler option then use the value as-is
-                            // This is the case if the value is expect to be string, number, boolean or list of string
-                            result.set(name, value);
-                        }
-                        else {
-                            if (optionDefinition.type === "list") {
-                                result.set(name, value.map(function (element) { return getNameOfCompilerOptionValue(element, customTypeMap_1); })); // TODO: GH#18217
-                            }
-                            else {
-                                // There is a typeMap associated with this command-line option so use it to map value back to its name
-                                result.set(name, getNameOfCompilerOptionValue(value, customTypeMap_1));
-                            }
-                        }
-                    }
-                }
-            };
-            for (var name in options) {
-                _loop_11(name);
-            }
-            return result;
-        }
-        function getDefaultValueForOption(option) {
-            switch (option.type) {
-                case "number":
-                    return 1;
-                case "boolean":
-                    return true;
-                case "string":
-                    return option.isFilePath ? "./" : "";
-                case "list":
-                    return [];
-                case "object":
-                    return {};
-                default:
-                    return option.type.keys().next().value;
-            }
-        }
-        function makePadding(paddingLength) {
-            return Array(paddingLength + 1).join(" ");
-        }
-        function isAllowedOption(_a) {
-            var category = _a.category, name = _a.name;
-            // Skip options which do not have a category or have category `Command_line_Options`
-            // Exclude all possible `Advanced_Options` in tsconfig.json which were NOT defined in command line
-            return category !== undefined
-                && category !== ts.Diagnostics.Command_line_Options
-                && (category !== ts.Diagnostics.Advanced_Options || compilerOptionsMap.has(name));
-        }
-        function writeConfigurations() {
-            // Filter applicable options to place in the file
-            var categorizedOptions = ts.createMultiMap();
-            for (var _i = 0, optionDeclarations_1 = ts.optionDeclarations; _i < optionDeclarations_1.length; _i++) {
-                var option = optionDeclarations_1[_i];
-                var category = option.category;
-                if (isAllowedOption(option)) {
-                    categorizedOptions.add(ts.getLocaleSpecificMessage(category), option);
-                }
-            }
-            // Serialize all options and their descriptions
-            var marginLength = 0;
-            var seenKnownKeys = 0;
-            var nameColumn = [];
-            var descriptionColumn = [];
-            categorizedOptions.forEach(function (options, category) {
-                if (nameColumn.length !== 0) {
-                    nameColumn.push("");
-                    descriptionColumn.push("");
-                }
-                nameColumn.push("/* " + category + " */");
-                descriptionColumn.push("");
-                for (var _i = 0, options_1 = options; _i < options_1.length; _i++) {
-                    var option = options_1[_i];
-                    var optionName = void 0;
-                    if (compilerOptionsMap.has(option.name)) {
-                        optionName = "\"" + option.name + "\": " + JSON.stringify(compilerOptionsMap.get(option.name)) + ((seenKnownKeys += 1) === compilerOptionsMap.size ? "" : ",");
-                    }
-                    else {
-                        optionName = "// \"" + option.name + "\": " + JSON.stringify(getDefaultValueForOption(option)) + ",";
-                    }
-                    nameColumn.push(optionName);
-                    descriptionColumn.push("/* " + (option.description && ts.getLocaleSpecificMessage(option.description) || option.name) + " */");
-                    marginLength = Math.max(optionName.length, marginLength);
-                }
-            });
-            // Write the output
-            var tab = makePadding(2);
-            var result = [];
-            result.push("{");
-            result.push(tab + "\"compilerOptions\": {");
-            // Print out each row, aligning all the descriptions on the same column.
-            for (var i = 0; i < nameColumn.length; i++) {
-                var optionName = nameColumn[i];
-                var description = descriptionColumn[i];
-                result.push(optionName && "" + tab + tab + optionName + (description && (makePadding(marginLength - optionName.length + 2) + description)));
-            }
-            if (fileNames.length) {
-                result.push(tab + "},");
-                result.push(tab + "\"files\": [");
-                for (var i = 0; i < fileNames.length; i++) {
-                    result.push("" + tab + tab + JSON.stringify(fileNames[i]) + (i === fileNames.length - 1 ? "" : ","));
-                }
-                result.push(tab + "]");
-            }
-            else {
-                result.push(tab + "}");
-            }
-            result.push("}");
-            return result.join(newLine);
-        }
-    }
-    ts.generateTSConfig = generateTSConfig;
-    /**
-     * Parse the contents of a config file (tsconfig.json).
-     * @param json The contents of the config file to parse
-     * @param host Instance of ParseConfigHost used to enumerate files in folder.
-     * @param basePath A root directory to resolve relative path entries in the config
-     *    file to. e.g. outDir
-     */
-    function parseJsonConfigFileContent(json, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions) {
-        return parseJsonConfigFileContentWorker(json, /*sourceFile*/ undefined, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions);
-    }
-    ts.parseJsonConfigFileContent = parseJsonConfigFileContent;
-    /**
-     * Parse the contents of a config file (tsconfig.json).
-     * @param jsonNode The contents of the config file to parse
-     * @param host Instance of ParseConfigHost used to enumerate files in folder.
-     * @param basePath A root directory to resolve relative path entries in the config
-     *    file to. e.g. outDir
-     */
-    function parseJsonSourceFileConfigFileContent(sourceFile, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions) {
-        return parseJsonConfigFileContentWorker(/*json*/ undefined, sourceFile, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions);
-    }
-    ts.parseJsonSourceFileConfigFileContent = parseJsonSourceFileConfigFileContent;
-    /*@internal*/
-    function setConfigFileInOptions(options, configFile) {
-        if (configFile) {
-            Object.defineProperty(options, "configFile", { enumerable: false, writable: false, value: configFile });
-        }
-    }
-    ts.setConfigFileInOptions = setConfigFileInOptions;
-    function isNullOrUndefined(x) {
-        // tslint:disable-next-line:no-null-keyword
-        return x === undefined || x === null;
-    }
-    function directoryOfCombinedPath(fileName, basePath) {
-        // Use the `getNormalizedAbsolutePath` function to avoid canonicalizing the path, as it must remain noncanonical
-        // until consistient casing errors are reported
-        return ts.getDirectoryPath(ts.getNormalizedAbsolutePath(fileName, basePath));
-    }
-    /**
-     * Parse the contents of a config file from json or json source file (tsconfig.json).
-     * @param json The contents of the config file to parse
-     * @param sourceFile sourceFile corresponding to the Json
-     * @param host Instance of ParseConfigHost used to enumerate files in folder.
-     * @param basePath A root directory to resolve relative path entries in the config
-     *    file to. e.g. outDir
-     * @param resolutionStack Only present for backwards-compatibility. Should be empty.
-     */
-    function parseJsonConfigFileContentWorker(json, sourceFile, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions) {
-        if (existingOptions === void 0) { existingOptions = {}; }
-        if (resolutionStack === void 0) { resolutionStack = []; }
-        if (extraFileExtensions === void 0) { extraFileExtensions = []; }
-        ts.Debug.assert((json === undefined && sourceFile !== undefined) || (json !== undefined && sourceFile === undefined));
-        var errors = [];
-        var parsedConfig = parseConfig(json, sourceFile, host, basePath, configFileName, resolutionStack, errors);
-        var raw = parsedConfig.raw;
-        var options = ts.extend(existingOptions, parsedConfig.options || {});
-        options.configFilePath = configFileName && ts.normalizeSlashes(configFileName);
-        setConfigFileInOptions(options, sourceFile);
-        var _a = getFileNames(), fileNames = _a.fileNames, wildcardDirectories = _a.wildcardDirectories, spec = _a.spec, projectReferences = _a.projectReferences;
-        return {
-            options: options,
-            fileNames: fileNames,
-            projectReferences: projectReferences,
-            typeAcquisition: parsedConfig.typeAcquisition || getDefaultTypeAcquisition(),
-            raw: raw,
-            errors: errors,
-            wildcardDirectories: wildcardDirectories,
-            compileOnSave: !!raw.compileOnSave,
-            configFileSpecs: spec
-        };
-        function getFileNames() {
-            var filesSpecs;
-            if (ts.hasProperty(raw, "files") && !isNullOrUndefined(raw.files)) {
-                if (ts.isArray(raw.files)) {
-                    filesSpecs = raw.files;
-                    if (filesSpecs.length === 0) {
-                        createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.The_files_list_in_config_file_0_is_empty, configFileName || "tsconfig.json");
-                    }
-                }
-                else {
-                    createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "files", "Array");
-                }
-            }
-            var includeSpecs;
-            if (ts.hasProperty(raw, "include") && !isNullOrUndefined(raw.include)) {
-                if (ts.isArray(raw.include)) {
-                    includeSpecs = raw.include;
-                }
-                else {
-                    createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "include", "Array");
-                }
-            }
-            var excludeSpecs;
-            if (ts.hasProperty(raw, "exclude") && !isNullOrUndefined(raw.exclude)) {
-                if (ts.isArray(raw.exclude)) {
-                    excludeSpecs = raw.exclude;
-                }
-                else {
-                    createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "exclude", "Array");
-                }
-            }
-            else if (raw.compilerOptions) {
-                var outDir = raw.compilerOptions.outDir;
-                var declarationDir = raw.compilerOptions.declarationDir;
-                if (outDir || declarationDir) {
-                    excludeSpecs = [outDir, declarationDir].filter(function (d) { return !!d; });
-                }
-            }
-            if (filesSpecs === undefined && includeSpecs === undefined) {
-                includeSpecs = ["**/*"];
-            }
-            var result = matchFileNames(filesSpecs, includeSpecs, excludeSpecs, configFileName ? directoryOfCombinedPath(configFileName, basePath) : basePath, options, host, errors, extraFileExtensions, sourceFile);
-            if (result.fileNames.length === 0 && !ts.hasProperty(raw, "files") && resolutionStack.length === 0 && !ts.hasProperty(raw, "references")) {
-                errors.push(getErrorForNoInputFiles(result.spec, configFileName));
-            }
-            if (ts.hasProperty(raw, "references") && !isNullOrUndefined(raw.references)) {
-                if (ts.isArray(raw.references)) {
-                    var references = [];
-                    for (var _i = 0, _a = raw.references; _i < _a.length; _i++) {
-                        var ref = _a[_i];
-                        if (typeof ref.path !== "string") {
-                            createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "reference.path", "string");
-                        }
-                        else {
-                            references.push({
-                                path: ts.getNormalizedAbsolutePath(ref.path, basePath),
-                                originalPath: ref.path,
-                                prepend: ref.prepend,
-                                circular: ref.circular
-                            });
-                        }
-                    }
-                    result.projectReferences = references;
-                }
-                else {
-                    createCompilerDiagnosticOnlyIfJson(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "references", "Array");
-                }
-            }
-            return result;
-        }
-        function createCompilerDiagnosticOnlyIfJson(message, arg0, arg1) {
-            if (!sourceFile) {
-                errors.push(ts.createCompilerDiagnostic(message, arg0, arg1));
-            }
-        }
-    }
-    /*@internal*/
-    function isErrorNoInputFiles(error) {
-        return error.code === ts.Diagnostics.No_inputs_were_found_in_config_file_0_Specified_include_paths_were_1_and_exclude_paths_were_2.code;
-    }
-    ts.isErrorNoInputFiles = isErrorNoInputFiles;
-    /*@internal*/
-    function getErrorForNoInputFiles(_a, configFileName) {
-        var includeSpecs = _a.includeSpecs, excludeSpecs = _a.excludeSpecs;
-        return ts.createCompilerDiagnostic(ts.Diagnostics.No_inputs_were_found_in_config_file_0_Specified_include_paths_were_1_and_exclude_paths_were_2, configFileName || "tsconfig.json", JSON.stringify(includeSpecs || []), JSON.stringify(excludeSpecs || []));
-    }
-    ts.getErrorForNoInputFiles = getErrorForNoInputFiles;
-    function isSuccessfulParsedTsconfig(value) {
-        return !!value.options;
-    }
-    /**
-     * This *just* extracts options/include/exclude/files out of a config file.
-     * It does *not* resolve the included files.
-     */
-    function parseConfig(json, sourceFile, host, basePath, configFileName, resolutionStack, errors) {
-        basePath = ts.normalizeSlashes(basePath);
-        var resolvedPath = ts.getNormalizedAbsolutePath(configFileName || "", basePath);
-        if (resolutionStack.indexOf(resolvedPath) >= 0) {
-            errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Circularity_detected_while_resolving_configuration_Colon_0, resolutionStack.concat([resolvedPath]).join(" -> ")));
-            return { raw: json || convertToObject(sourceFile, errors) };
-        }
-        var ownConfig = json ?
-            parseOwnConfigOfJson(json, host, basePath, configFileName, errors) :
-            parseOwnConfigOfJsonSourceFile(sourceFile, host, basePath, configFileName, errors);
-        if (ownConfig.extendedConfigPath) {
-            // copy the resolution stack so it is never reused between branches in potential diamond-problem scenarios.
-            resolutionStack = resolutionStack.concat([resolvedPath]);
-            var extendedConfig = getExtendedConfig(sourceFile, ownConfig.extendedConfigPath, host, basePath, resolutionStack, errors);
-            if (extendedConfig && isSuccessfulParsedTsconfig(extendedConfig)) {
-                var baseRaw_1 = extendedConfig.raw;
-                var raw_1 = ownConfig.raw;
-                var setPropertyInRawIfNotUndefined = function (propertyName) {
-                    var value = raw_1[propertyName] || baseRaw_1[propertyName];
-                    if (value) {
-                        raw_1[propertyName] = value;
-                    }
-                };
-                setPropertyInRawIfNotUndefined("include");
-                setPropertyInRawIfNotUndefined("exclude");
-                setPropertyInRawIfNotUndefined("files");
-                if (raw_1.compileOnSave === undefined) {
-                    raw_1.compileOnSave = baseRaw_1.compileOnSave;
-                }
-                ownConfig.options = ts.assign({}, extendedConfig.options, ownConfig.options);
-                // TODO extend type typeAcquisition
-            }
-        }
-        return ownConfig;
-    }
-    function parseOwnConfigOfJson(json, host, basePath, configFileName, errors) {
-        if (ts.hasProperty(json, "excludes")) {
-            errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Unknown_option_excludes_Did_you_mean_exclude));
-        }
-        var options = convertCompilerOptionsFromJsonWorker(json.compilerOptions, basePath, errors, configFileName);
-        // typingOptions has been deprecated and is only supported for backward compatibility purposes.
-        // It should be removed in future releases - use typeAcquisition instead.
-        var typeAcquisition = convertTypeAcquisitionFromJsonWorker(json.typeAcquisition || json.typingOptions, basePath, errors, configFileName);
-        json.compileOnSave = convertCompileOnSaveOptionFromJson(json, basePath, errors);
-        var extendedConfigPath;
-        if (json.extends) {
-            if (!ts.isString(json.extends)) {
-                errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, "extends", "string"));
-            }
-            else {
-                var newBase = configFileName ? directoryOfCombinedPath(configFileName, basePath) : basePath;
-                extendedConfigPath = getExtendsConfigPath(json.extends, host, newBase, errors, ts.createCompilerDiagnostic);
-            }
-        }
-        return { raw: json, options: options, typeAcquisition: typeAcquisition, extendedConfigPath: extendedConfigPath };
-    }
-    function parseOwnConfigOfJsonSourceFile(sourceFile, host, basePath, configFileName, errors) {
-        var options = getDefaultCompilerOptions(configFileName);
-        var typeAcquisition, typingOptionstypeAcquisition;
-        var extendedConfigPath;
-        var optionsIterator = {
-            onSetValidOptionKeyValueInParent: function (parentOption, option, value) {
-                ts.Debug.assert(parentOption === "compilerOptions" || parentOption === "typeAcquisition" || parentOption === "typingOptions");
-                var currentOption = parentOption === "compilerOptions" ?
-                    options :
-                    parentOption === "typeAcquisition" ?
-                        (typeAcquisition || (typeAcquisition = getDefaultTypeAcquisition(configFileName))) :
-                        (typingOptionstypeAcquisition || (typingOptionstypeAcquisition = getDefaultTypeAcquisition(configFileName)));
-                currentOption[option.name] = normalizeOptionValue(option, basePath, value);
-            },
-            onSetValidOptionKeyValueInRoot: function (key, _keyNode, value, valueNode) {
-                switch (key) {
-                    case "extends":
-                        var newBase = configFileName ? directoryOfCombinedPath(configFileName, basePath) : basePath;
-                        extendedConfigPath = getExtendsConfigPath(value, host, newBase, errors, function (message, arg0) {
-                            return ts.createDiagnosticForNodeInSourceFile(sourceFile, valueNode, message, arg0);
+            var _loop_9 = function (resolved) {
+                var cfg = configFileCache.parseConfigFile(resolved);
+                if (cfg) {
+                    // Watch this file
+                    system.watchFile(resolved, function () {
+                        configFileCache.removeKey(resolved);
+                        invalidateProjectAndScheduleBuilds(resolved);
+                    });
+                    // Update watchers for wildcard directories
+                    if (cfg.configFileSpecs) {
+                        ts.updateWatchingWildcardDirectories(existingWatchersForWildcards, ts.createMapFromTemplate(cfg.configFileSpecs.wildcardDirectories), function (dir, flags) {
+                            return system.watchDirectory(dir, function () {
+                                invalidateProjectAndScheduleBuilds(resolved);
+                            }, !!(flags & 1 /* Recursive */));
                         });
-                        return;
-                    case "files":
-                        if (value.length === 0) {
-                            errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, valueNode, ts.Diagnostics.The_files_list_in_config_file_0_is_empty, configFileName || "tsconfig.json"));
-                        }
-                        return;
+                    }
+                    // Watch input files
+                    for (var _i = 0, _a = cfg.fileNames; _i < _a.length; _i++) {
+                        var input = _a[_i];
+                        system.watchFile(input, function () {
+                            invalidateProjectAndScheduleBuilds(resolved);
+                        });
+                    }
                 }
-            },
-            onSetUnknownOptionKeyValueInRoot: function (key, keyNode, _value, _valueNode) {
-                if (key === "excludes") {
-                    errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, keyNode, ts.Diagnostics.Unknown_option_excludes_Did_you_mean_exclude));
+            };
+            for (var _i = 0, _a = graph.buildQueue; _i < _a.length; _i++) {
+                var resolved = _a[_i];
+                _loop_9(resolved);
+            }
+            function invalidateProjectAndScheduleBuilds(resolved) {
+                invalidateProject(resolved);
+                system.setTimeout(buildInvalidatedProjects, 100);
+                system.setTimeout(buildDependentInvalidatedProjects, 3000);
+            }
+        }
+        function resetBuildContext(opts) {
+            if (opts === void 0) { opts = defaultOptions; }
+            context = createBuildContext(opts);
+        }
+        function getUpToDateStatusOfFile(configFileName) {
+            return getUpToDateStatus(configFileCache.parseConfigFile(configFileName));
+        }
+        function getBuildGraph(configFileNames) {
+            var resolvedNames = resolveProjectNames(configFileNames);
+            if (resolvedNames === undefined)
+                return undefined;
+            return createDependencyGraph(resolvedNames);
+        }
+        function getGlobalDependencyGraph() {
+            return getBuildGraph(rootNames);
+        }
+        function getUpToDateStatus(project) {
+            if (project === undefined) {
+                return { type: UpToDateStatusType.Unbuildable, reason: "File deleted mid-build" };
+            }
+            var prior = context.projectStatus.getValueOrUndefined(project.options.configFilePath);
+            if (prior !== undefined) {
+                return prior;
+            }
+            var actual = getUpToDateStatusWorker(project);
+            context.projectStatus.setValue(project.options.configFilePath, actual);
+            return actual;
+        }
+        function invalidateProject(configFileName) {
+            var resolved = resolveProjectName(configFileName);
+            if (resolved === undefined) {
+                // If this was a rootName, we need to track it as missing.
+                // Otherwise we can just ignore it and have it possibly surface as an error in any downstream projects,
+                // if they exist
+                // TODO: do those things
+                return;
+            }
+            configFileCache.removeKey(resolved);
+            context.invalidatedProjects.setValue(resolved, true);
+            context.projectStatus.removeKey(resolved);
+            var graph = getGlobalDependencyGraph();
+            if (graph) {
+                queueBuildForDownstreamReferences(resolved);
+            }
+            // Mark all downstream projects of this one needing to be built "later"
+            function queueBuildForDownstreamReferences(root) {
+                debugger;
+                var deps = graph.dependencyMap.getReferencesTo(root);
+                for (var _i = 0, deps_1 = deps; _i < deps_1.length; _i++) {
+                    var ref = deps_1[_i];
+                    // Can skip circular references
+                    if (!context.queuedProjects.hasKey(ref)) {
+                        context.queuedProjects.setValue(ref, true);
+                        queueBuildForDownstreamReferences(ref);
+                    }
                 }
             }
-        };
-        var json = convertToObjectWorker(sourceFile, errors, /*returnValue*/ true, getTsconfigRootOptionsMap(), optionsIterator);
-        if (!typeAcquisition) {
-            if (typingOptionstypeAcquisition) {
-                typeAcquisition = (typingOptionstypeAcquisition.enableAutoDiscovery !== undefined) ?
-                    {
-                        enable: typingOptionstypeAcquisition.enableAutoDiscovery,
-                        include: typingOptionstypeAcquisition.include,
-                        exclude: typingOptionstypeAcquisition.exclude
-                    } :
-                    typingOptionstypeAcquisition;
+        }
+        function buildInvalidatedProjects() {
+            buildSomeProjects(function (p) { return context.invalidatedProjects.hasKey(p); });
+        }
+        function buildDependentInvalidatedProjects() {
+            buildSomeProjects(function (p) { return context.queuedProjects.hasKey(p); });
+        }
+        function buildSomeProjects(predicate) {
+            var resolvedNames = resolveProjectNames(rootNames);
+            if (resolvedNames === undefined)
+                return;
+            var graph = createDependencyGraph(resolvedNames);
+            for (var _i = 0, _a = graph.buildQueue; _i < _a.length; _i++) {
+                var next = _a[_i];
+                if (!predicate(next))
+                    continue;
+                var resolved = resolveProjectName(next);
+                if (!resolved)
+                    continue; // ??
+                var proj = configFileCache.parseConfigFile(resolved);
+                if (!proj)
+                    continue; // ?
+                var status = getUpToDateStatus(proj);
+                verboseReportProjectStatus(next, status);
+                if (status.type === UpToDateStatusType.UpstreamBlocked) {
+                    if (context.options.verbose)
+                        buildHost.verbose(ts.Diagnostics.Skipping_build_of_project_0_because_its_dependency_1_has_errors, resolved, status.upstreamProjectName);
+                    continue;
+                }
+                buildSingleProject(next);
+            }
+        }
+        function getAllProjectOutputs(project) {
+            if (project.options.outFile) {
+                return getOutFileOutputs(project);
             }
             else {
-                typeAcquisition = getDefaultTypeAcquisition(configFileName);
+                var outputs = [];
+                for (var _i = 0, _a = project.fileNames; _i < _a.length; _i++) {
+                    var inputFile = _a[_i];
+                    outputs.push.apply(outputs, getOutputFileNames(inputFile, project));
+                }
+                return outputs;
             }
         }
-        return { raw: json, options: options, typeAcquisition: typeAcquisition, extendedConfigPath: extendedConfigPath };
-    }
-    function getExtendsConfigPath(extendedConfig, host, basePath, errors, createDiagnostic) {
-        extendedConfig = ts.normalizeSlashes(extendedConfig);
-        // If the path isn't a rooted or relative path, don't try to resolve it (we reserve the right to special case module-id like paths in the future)
-        if (!(ts.isRootedDiskPath(extendedConfig) || ts.startsWith(extendedConfig, "./") || ts.startsWith(extendedConfig, "../"))) {
-            errors.push(createDiagnostic(ts.Diagnostics.A_path_in_an_extends_option_must_be_relative_or_rooted_but_0_is_not, extendedConfig));
-            return undefined;
+        function getUpToDateStatusWorker(project) {
+            var newestInputFileName = undefined;
+            var newestInputFileTime = minimumDate;
+            // Get timestamps of input files
+            for (var _i = 0, _a = project.fileNames; _i < _a.length; _i++) {
+                var inputFile = _a[_i];
+                if (!compilerHost.fileExists(inputFile)) {
+                    return {
+                        type: UpToDateStatusType.Unbuildable,
+                        reason: inputFile + " does not exist"
+                    };
+                }
+                var inputTime = compilerHost.getModifiedTime(inputFile);
+                if (inputTime > newestInputFileTime) {
+                    newestInputFileName = inputFile;
+                    newestInputFileTime = inputTime;
+                }
+            }
+            // Collect the expected outputs of this project
+            var outputs = getAllProjectOutputs(project);
+            if (outputs.length === 0) {
+                return {
+                    type: UpToDateStatusType.ContainerOnly
+                };
+            }
+            // Now see if all outputs are newer than the newest input
+            var oldestOutputFileName = "(none)";
+            var oldestOutputFileTime = maximumDate;
+            var newestOutputFileName = "(none)";
+            var newestOutputFileTime = minimumDate;
+            var missingOutputFileName;
+            var newestDeclarationFileContentChangedTime = minimumDate;
+            var isOutOfDateWithInputs = false;
+            for (var _b = 0, outputs_1 = outputs; _b < outputs_1.length; _b++) {
+                var output = outputs_1[_b];
+                // Output is missing; can stop checking
+                // Don't immediately return because we can still be upstream-blocked, which is a higher-priority status
+                if (!compilerHost.fileExists(output)) {
+                    missingOutputFileName = output;
+                    break;
+                }
+                var outputTime = compilerHost.getModifiedTime(output);
+                if (outputTime < oldestOutputFileTime) {
+                    oldestOutputFileTime = outputTime;
+                    oldestOutputFileName = output;
+                }
+                // If an output is older than the newest input, we can stop checking
+                // Don't immediately return because we can still be upstream-blocked, which is a higher-priority status
+                if (outputTime < newestInputFileTime) {
+                    isOutOfDateWithInputs = true;
+                    break;
+                }
+                if (outputTime > newestOutputFileTime) {
+                    newestOutputFileTime = outputTime;
+                    newestOutputFileName = output;
+                }
+                // Keep track of when the most recent time a .d.ts file was changed.
+                // In addition to file timestamps, we also keep track of when a .d.ts file
+                // had its file touched but not had its contents changed - this allows us
+                // to skip a downstream typecheck
+                if (isDeclarationFile(output)) {
+                    var unchangedTime = context.unchangedOutputs.getValueOrUndefined(output);
+                    if (unchangedTime !== undefined) {
+                        newestDeclarationFileContentChangedTime = newer(unchangedTime, newestDeclarationFileContentChangedTime);
+                    }
+                    else {
+                        newestDeclarationFileContentChangedTime = newer(newestDeclarationFileContentChangedTime, compilerHost.getModifiedTime(output));
+                    }
+                }
+            }
+            var pseudoUpToDate = false;
+            if (project.projectReferences) {
+                for (var _c = 0, _d = project.projectReferences; _c < _d.length; _c++) {
+                    var ref = _d[_c];
+                    var resolvedRef = ts.resolveProjectReferencePath(compilerHost, ref);
+                    var refStatus = getUpToDateStatus(configFileCache.parseConfigFile(resolvedRef));
+                    // An upstream project is blocked
+                    if (refStatus.type === UpToDateStatusType.Unbuildable) {
+                        return {
+                            type: UpToDateStatusType.UpstreamBlocked,
+                            upstreamProjectName: ref.path
+                        };
+                    }
+                    // If the upstream project is out of date, then so are we (someone shouldn't have asked, though?)
+                    if (refStatus.type !== UpToDateStatusType.UpToDate) {
+                        return {
+                            type: UpToDateStatusType.UpstreamOutOfDate,
+                            upstreamProjectName: ref.path
+                        };
+                    }
+                    // If the upstream project's newest file is older than our oldest output, we
+                    // can't be out of date because of it
+                    if (refStatus.newestInputFileTime <= oldestOutputFileTime) {
+                        continue;
+                    }
+                    // If the upstream project has only change .d.ts files, and we've built
+                    // *after* those files, then we're "psuedo up to date" and eligible for a fast rebuild
+                    if (refStatus.newestDeclarationFileContentChangedTime <= oldestOutputFileTime) {
+                        pseudoUpToDate = true;
+                        continue;
+                    }
+                    // We have an output older than an upstream output - we are out of date
+                    ts.Debug.assert(oldestOutputFileName !== undefined, "Should have an oldest output filename here");
+                    return {
+                        type: UpToDateStatusType.OutOfDateWithUpstream,
+                        outOfDateOutputFileName: oldestOutputFileName,
+                        newerProjectName: ref.path
+                    };
+                }
+            }
+            if (missingOutputFileName !== undefined) {
+                return {
+                    type: UpToDateStatusType.OutputMissing,
+                    missingOutputFileName: missingOutputFileName
+                };
+            }
+            if (isOutOfDateWithInputs) {
+                return {
+                    type: UpToDateStatusType.OutOfDateWithSelf,
+                    outOfDateOutputFileName: oldestOutputFileName,
+                    newerInputFileName: newestInputFileName
+                };
+            }
+            // Up to date
+            return {
+                type: pseudoUpToDate ? UpToDateStatusType.UpToDateWithUpstreamTypes : UpToDateStatusType.UpToDate,
+                newestDeclarationFileContentChangedTime: newestDeclarationFileContentChangedTime,
+                newestInputFileTime: newestInputFileTime,
+                newestOutputFileTime: newestOutputFileTime,
+                newestInputFileName: newestInputFileName,
+                newestOutputFileName: newestOutputFileName,
+                oldestOutputFileName: oldestOutputFileName
+            };
         }
-        var extendedConfigPath = ts.getNormalizedAbsolutePath(extendedConfig, basePath);
-        if (!host.fileExists(extendedConfigPath) && !ts.endsWith(extendedConfigPath, ".json" /* Json */)) {
-            extendedConfigPath = extendedConfigPath + ".json";
-            if (!host.fileExists(extendedConfigPath)) {
-                errors.push(createDiagnostic(ts.Diagnostics.File_0_does_not_exist, extendedConfig));
+        function createDependencyGraph(roots) {
+            var temporaryMarks = {};
+            var permanentMarks = {};
+            var circularityReportStack = [];
+            var buildOrder = [];
+            var graph = createDependencyMapper();
+            var hadError = false;
+            for (var _i = 0, roots_1 = roots; _i < roots_1.length; _i++) {
+                var root = roots_1[_i];
+                visit(root);
+            }
+            if (hadError) {
                 return undefined;
             }
-        }
-        return extendedConfigPath;
-    }
-    function getExtendedConfig(sourceFile, extendedConfigPath, host, basePath, resolutionStack, errors) {
-        var _a;
-        var extendedResult = readJsonConfigFile(extendedConfigPath, function (path) { return host.readFile(path); });
-        if (sourceFile) {
-            (sourceFile.extendedSourceFiles || (sourceFile.extendedSourceFiles = [])).push(extendedResult.fileName);
-        }
-        if (extendedResult.parseDiagnostics.length) {
-            errors.push.apply(errors, extendedResult.parseDiagnostics);
-            return undefined;
-        }
-        var extendedDirname = ts.getDirectoryPath(extendedConfigPath);
-        var extendedConfig = parseConfig(/*json*/ undefined, extendedResult, host, extendedDirname, ts.getBaseFileName(extendedConfigPath), resolutionStack, errors);
-        if (sourceFile) {
-            (_a = sourceFile.extendedSourceFiles).push.apply(_a, extendedResult.extendedSourceFiles);
-        }
-        if (isSuccessfulParsedTsconfig(extendedConfig)) {
-            // Update the paths to reflect base path
-            var relativeDifference_1 = ts.convertToRelativePath(extendedDirname, basePath, ts.identity);
-            var updatePath_1 = function (path) { return ts.isRootedDiskPath(path) ? path : ts.combinePaths(relativeDifference_1, path); };
-            var mapPropertiesInRawIfNotUndefined = function (propertyName) {
-                if (raw_2[propertyName]) {
-                    raw_2[propertyName] = ts.map(raw_2[propertyName], updatePath_1);
-                }
-            };
-            var raw_2 = extendedConfig.raw;
-            mapPropertiesInRawIfNotUndefined("include");
-            mapPropertiesInRawIfNotUndefined("exclude");
-            mapPropertiesInRawIfNotUndefined("files");
-        }
-        return extendedConfig;
-    }
-    function convertCompileOnSaveOptionFromJson(jsonOption, basePath, errors) {
-        if (!ts.hasProperty(jsonOption, ts.compileOnSaveCommandLineOption.name)) {
-            return false;
-        }
-        var result = convertJsonOption(ts.compileOnSaveCommandLineOption, jsonOption.compileOnSave, basePath, errors);
-        return typeof result === "boolean" && result;
-    }
-    function convertCompilerOptionsFromJson(jsonOptions, basePath, configFileName) {
-        var errors = [];
-        var options = convertCompilerOptionsFromJsonWorker(jsonOptions, basePath, errors, configFileName);
-        return { options: options, errors: errors };
-    }
-    ts.convertCompilerOptionsFromJson = convertCompilerOptionsFromJson;
-    function convertTypeAcquisitionFromJson(jsonOptions, basePath, configFileName) {
-        var errors = [];
-        var options = convertTypeAcquisitionFromJsonWorker(jsonOptions, basePath, errors, configFileName);
-        return { options: options, errors: errors };
-    }
-    ts.convertTypeAcquisitionFromJson = convertTypeAcquisitionFromJson;
-    function getDefaultCompilerOptions(configFileName) {
-        var options = configFileName && ts.getBaseFileName(configFileName) === "jsconfig.json"
-            ? { allowJs: true, maxNodeModuleJsDepth: 2, allowSyntheticDefaultImports: true, skipLibCheck: true, noEmit: true }
-            : {};
-        return options;
-    }
-    function convertCompilerOptionsFromJsonWorker(jsonOptions, basePath, errors, configFileName) {
-        var options = getDefaultCompilerOptions(configFileName);
-        convertOptionsFromJson(ts.optionDeclarations, jsonOptions, basePath, options, ts.Diagnostics.Unknown_compiler_option_0, errors);
-        if (configFileName) {
-            options.configFilePath = ts.normalizeSlashes(configFileName);
-        }
-        return options;
-    }
-    function getDefaultTypeAcquisition(configFileName) {
-        return { enable: !!configFileName && ts.getBaseFileName(configFileName) === "jsconfig.json", include: [], exclude: [] };
-    }
-    function convertTypeAcquisitionFromJsonWorker(jsonOptions, basePath, errors, configFileName) {
-        var options = getDefaultTypeAcquisition(configFileName);
-        var typeAcquisition = convertEnableAutoDiscoveryToEnable(jsonOptions);
-        convertOptionsFromJson(ts.typeAcquisitionDeclarations, typeAcquisition, basePath, options, ts.Diagnostics.Unknown_type_acquisition_option_0, errors);
-        return options;
-    }
-    function convertOptionsFromJson(optionDeclarations, jsonOptions, basePath, defaultOptions, diagnosticMessage, errors) {
-        if (!jsonOptions) {
-            return;
-        }
-        var optionNameMap = commandLineOptionsToMap(optionDeclarations);
-        for (var id in jsonOptions) {
-            var opt = optionNameMap.get(id);
-            if (opt) {
-                defaultOptions[opt.name] = convertJsonOption(opt, jsonOptions[id], basePath, errors);
-            }
-            else {
-                errors.push(ts.createCompilerDiagnostic(diagnosticMessage, id));
-            }
-        }
-    }
-    function convertJsonOption(opt, value, basePath, errors) {
-        if (isCompilerOptionsValue(opt, value)) {
-            var optType = opt.type;
-            if (optType === "list" && ts.isArray(value)) {
-                return convertJsonOptionOfListType(opt, value, basePath, errors);
-            }
-            else if (!ts.isString(optType)) {
-                return convertJsonOptionOfCustomType(opt, value, errors);
-            }
-            return normalizeNonListOptionValue(opt, basePath, value);
-        }
-        else {
-            errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Compiler_option_0_requires_a_value_of_type_1, opt.name, getCompilerOptionValueTypeString(opt)));
-        }
-    }
-    function normalizeOptionValue(option, basePath, value) {
-        if (isNullOrUndefined(value))
-            return undefined;
-        if (option.type === "list") {
-            var listOption_1 = option;
-            if (listOption_1.element.isFilePath || !ts.isString(listOption_1.element.type)) {
-                return ts.filter(ts.map(value, function (v) { return normalizeOptionValue(listOption_1.element, basePath, v); }), function (v) { return !!v; });
-            }
-            return value;
-        }
-        else if (!ts.isString(option.type)) {
-            return option.type.get(ts.isString(value) ? value.toLowerCase() : value);
-        }
-        return normalizeNonListOptionValue(option, basePath, value);
-    }
-    function normalizeNonListOptionValue(option, basePath, value) {
-        if (option.isFilePath) {
-            value = ts.normalizePath(ts.combinePaths(basePath, value));
-            if (value === "") {
-                value = ".";
-            }
-        }
-        return value;
-    }
-    function convertJsonOptionOfCustomType(opt, value, errors) {
-        if (isNullOrUndefined(value))
-            return undefined;
-        var key = value.toLowerCase();
-        var val = opt.type.get(key);
-        if (val !== undefined) {
-            return val;
-        }
-        else {
-            errors.push(createCompilerDiagnosticForInvalidCustomType(opt));
-        }
-    }
-    function convertJsonOptionOfListType(option, values, basePath, errors) {
-        return ts.filter(ts.map(values, function (v) { return convertJsonOption(option.element, v, basePath, errors); }), function (v) { return !!v; });
-    }
-    function trimString(s) {
-        return typeof s.trim === "function" ? s.trim() : s.replace(/^[\s]+|[\s]+$/g, "");
-    }
-    /**
-     * Tests for a path that ends in a recursive directory wildcard.
-     * Matches **, \**, **\, and \**\, but not a**b.
-     *
-     * NOTE: used \ in place of / above to avoid issues with multiline comments.
-     *
-     * Breakdown:
-     *  (^|\/)      # matches either the beginning of the string or a directory separator.
-     *  \*\*        # matches the recursive directory wildcard "**".
-     *  \/?$        # matches an optional trailing directory separator at the end of the string.
-     */
-    var invalidTrailingRecursionPattern = /(^|\/)\*\*\/?$/;
-    /**
-     * Tests for a path where .. appears after a recursive directory wildcard.
-     * Matches **\..\*, **\a\..\*, and **\.., but not ..\**\*
-     *
-     * NOTE: used \ in place of / above to avoid issues with multiline comments.
-     *
-     * Breakdown:
-     *  (^|\/)      # matches either the beginning of the string or a directory separator.
-     *  \*\*\/      # matches a recursive directory wildcard "**" followed by a directory separator.
-     *  (.*\/)?     # optionally matches any number of characters followed by a directory separator.
-     *  \.\.        # matches a parent directory path component ".."
-     *  ($|\/)      # matches either the end of the string or a directory separator.
-     */
-    var invalidDotDotAfterRecursiveWildcardPattern = /(^|\/)\*\*\/(.*\/)?\.\.($|\/)/;
-    /**
-     * Tests for a path containing a wildcard character in a directory component of the path.
-     * Matches \*\, \?\, and \a*b\, but not \a\ or \a\*.
-     *
-     * NOTE: used \ in place of / above to avoid issues with multiline comments.
-     *
-     * Breakdown:
-     *  \/          # matches a directory separator.
-     *  [^/]*?      # matches any number of characters excluding directory separators (non-greedy).
-     *  [*?]        # matches either a wildcard character (* or ?)
-     *  [^/]*       # matches any number of characters excluding directory separators (greedy).
-     *  \/          # matches a directory separator.
-     */
-    var watchRecursivePattern = /\/[^/]*?[*?][^/]*\//;
-    /**
-     * Matches the portion of a wildcard path that does not contain wildcards.
-     * Matches \a of \a\*, or \a\b\c of \a\b\c\?\d.
-     *
-     * NOTE: used \ in place of / above to avoid issues with multiline comments.
-     *
-     * Breakdown:
-     *  ^                   # matches the beginning of the string
-     *  [^*?]*              # matches any number of non-wildcard characters
-     *  (?=\/[^/]*[*?])     # lookahead that matches a directory separator followed by
-     *                      # a path component that contains at least one wildcard character (* or ?).
-     */
-    var wildcardDirectoryPattern = /^[^*?]*(?=\/[^/]*[*?])/;
-    /**
-     * Expands an array of file specifications.
-     *
-     * @param filesSpecs The literal file names to include.
-     * @param includeSpecs The wildcard file specifications to include.
-     * @param excludeSpecs The wildcard file specifications to exclude.
-     * @param basePath The base path for any relative file specifications.
-     * @param options Compiler options.
-     * @param host The host used to resolve files and directories.
-     * @param errors An array for diagnostic reporting.
-     */
-    function matchFileNames(filesSpecs, includeSpecs, excludeSpecs, basePath, options, host, errors, extraFileExtensions, jsonSourceFile) {
-        basePath = ts.normalizePath(basePath);
-        var validatedIncludeSpecs, validatedExcludeSpecs;
-        // The exclude spec list is converted into a regular expression, which allows us to quickly
-        // test whether a file or directory should be excluded before recursively traversing the
-        // file system.
-        if (includeSpecs) {
-            validatedIncludeSpecs = validateSpecs(includeSpecs, errors, /*allowTrailingRecursion*/ false, jsonSourceFile, "include");
-        }
-        if (excludeSpecs) {
-            validatedExcludeSpecs = validateSpecs(excludeSpecs, errors, /*allowTrailingRecursion*/ true, jsonSourceFile, "exclude");
-        }
-        // Wildcard directories (provided as part of a wildcard path) are stored in a
-        // file map that marks whether it was a regular wildcard match (with a `*` or `?` token),
-        // or a recursive directory. This information is used by filesystem watchers to monitor for
-        // new entries in these paths.
-        var wildcardDirectories = getWildcardDirectories(validatedIncludeSpecs, validatedExcludeSpecs, basePath, host.useCaseSensitiveFileNames);
-        var spec = { filesSpecs: filesSpecs, referencesSpecs: undefined, includeSpecs: includeSpecs, excludeSpecs: excludeSpecs, validatedIncludeSpecs: validatedIncludeSpecs, validatedExcludeSpecs: validatedExcludeSpecs, wildcardDirectories: wildcardDirectories };
-        return getFileNamesFromConfigSpecs(spec, basePath, options, host, extraFileExtensions);
-    }
-    /**
-     * Gets the file names from the provided config file specs that contain, files, include, exclude and
-     * other properties needed to resolve the file names
-     * @param spec The config file specs extracted with file names to include, wildcards to include/exclude and other details
-     * @param basePath The base path for any relative file specifications.
-     * @param options Compiler options.
-     * @param host The host used to resolve files and directories.
-     * @param extraFileExtensions optionaly file extra file extension information from host
-     */
-    /* @internal */
-    function getFileNamesFromConfigSpecs(spec, basePath, options, host, extraFileExtensions) {
-        if (extraFileExtensions === void 0) { extraFileExtensions = []; }
-        basePath = ts.normalizePath(basePath);
-        var keyMapper = host.useCaseSensitiveFileNames ? ts.identity : ts.toLowerCase;
-        // Literal file names (provided via the "files" array in tsconfig.json) are stored in a
-        // file map with a possibly case insensitive key. We use this map later when when including
-        // wildcard paths.
-        var literalFileMap = ts.createMap();
-        // Wildcard paths (provided via the "includes" array in tsconfig.json) are stored in a
-        // file map with a possibly case insensitive key. We use this map to store paths matched
-        // via wildcard, and to handle extension priority.
-        var wildcardFileMap = ts.createMap();
-        var filesSpecs = spec.filesSpecs, validatedIncludeSpecs = spec.validatedIncludeSpecs, validatedExcludeSpecs = spec.validatedExcludeSpecs, wildcardDirectories = spec.wildcardDirectories;
-        // Rather than requery this for each file and filespec, we query the supported extensions
-        // once and store it on the expansion context.
-        var supportedExtensions = ts.getSupportedExtensions(options, extraFileExtensions);
-        // Literal files are always included verbatim. An "include" or "exclude" specification cannot
-        // remove a literal file.
-        if (filesSpecs) {
-            for (var _i = 0, filesSpecs_1 = filesSpecs; _i < filesSpecs_1.length; _i++) {
-                var fileName = filesSpecs_1[_i];
-                var file_13 = ts.getNormalizedAbsolutePath(fileName, basePath);
-                literalFileMap.set(keyMapper(file_13), file_13);
-            }
-        }
-        if (validatedIncludeSpecs && validatedIncludeSpecs.length > 0) {
-            for (var _a = 0, _b = host.readDirectory(basePath, supportedExtensions, validatedExcludeSpecs, validatedIncludeSpecs, /*depth*/ undefined); _a < _b.length; _a++) {
-                var file_14 = _b[_a];
-                // If we have already included a literal or wildcard path with a
-                // higher priority extension, we should skip this file.
-                //
-                // This handles cases where we may encounter both <file>.ts and
-                // <file>.d.ts (or <file>.js if "allowJs" is enabled) in the same
-                // directory when they are compilation outputs.
-                if (hasFileWithHigherPriorityExtension(file_14, literalFileMap, wildcardFileMap, supportedExtensions, keyMapper)) {
-                    continue;
-                }
-                // We may have included a wildcard path with a lower priority
-                // extension due to the user-defined order of entries in the
-                // "include" array. If there is a lower priority extension in the
-                // same directory, we should remove it.
-                removeWildcardFilesWithLowerPriorityExtension(file_14, wildcardFileMap, supportedExtensions, keyMapper);
-                var key = keyMapper(file_14);
-                if (!literalFileMap.has(key) && !wildcardFileMap.has(key)) {
-                    wildcardFileMap.set(key, file_14);
-                }
-            }
-        }
-        var literalFiles = ts.arrayFrom(literalFileMap.values());
-        var wildcardFiles = ts.arrayFrom(wildcardFileMap.values());
-        var projectReferences = spec.referencesSpecs && spec.referencesSpecs.map(function (r) {
-            return __assign({}, r, { path: ts.getNormalizedAbsolutePath(r.path, basePath) });
-        });
-        return {
-            fileNames: literalFiles.concat(wildcardFiles),
-            projectReferences: projectReferences,
-            wildcardDirectories: wildcardDirectories,
-            spec: spec
-        };
-    }
-    ts.getFileNamesFromConfigSpecs = getFileNamesFromConfigSpecs;
-    function validateSpecs(specs, errors, allowTrailingRecursion, jsonSourceFile, specKey) {
-        return specs.filter(function (spec) {
-            var diag = specToDiagnostic(spec, allowTrailingRecursion);
-            if (diag !== undefined) {
-                errors.push(createDiagnostic(diag, spec));
-            }
-            return diag === undefined;
-        });
-        function createDiagnostic(message, spec) {
-            var element = ts.getTsConfigPropArrayElementValue(jsonSourceFile, specKey, spec);
-            return element ?
-                ts.createDiagnosticForNodeInSourceFile(jsonSourceFile, element, message, spec) :
-                ts.createCompilerDiagnostic(message, spec);
-        }
-    }
-    function specToDiagnostic(spec, allowTrailingRecursion) {
-        if (!allowTrailingRecursion && invalidTrailingRecursionPattern.test(spec)) {
-            return ts.Diagnostics.File_specification_cannot_end_in_a_recursive_directory_wildcard_Asterisk_Asterisk_Colon_0;
-        }
-        else if (invalidDotDotAfterRecursiveWildcardPattern.test(spec)) {
-            return ts.Diagnostics.File_specification_cannot_contain_a_parent_directory_that_appears_after_a_recursive_directory_wildcard_Asterisk_Asterisk_Colon_0;
-        }
-    }
-    /**
-     * Gets directories in a set of include patterns that should be watched for changes.
-     */
-    function getWildcardDirectories(include, exclude, path, useCaseSensitiveFileNames) {
-        // We watch a directory recursively if it contains a wildcard anywhere in a directory segment
-        // of the pattern:
-        //
-        //  /a/b/**/d   - Watch /a/b recursively to catch changes to any d in any subfolder recursively
-        //  /a/b/*/d    - Watch /a/b recursively to catch any d in any immediate subfolder, even if a new subfolder is added
-        //  /a/b        - Watch /a/b recursively to catch changes to anything in any recursive subfoler
-        //
-        // We watch a directory without recursion if it contains a wildcard in the file segment of
-        // the pattern:
-        //
-        //  /a/b/*      - Watch /a/b directly to catch any new file
-        //  /a/b/a?z    - Watch /a/b directly to catch any new file matching a?z
-        var rawExcludeRegex = ts.getRegularExpressionForWildcard(exclude, path, "exclude");
-        var excludeRegex = rawExcludeRegex && new RegExp(rawExcludeRegex, useCaseSensitiveFileNames ? "" : "i");
-        var wildcardDirectories = {};
-        if (include !== undefined) {
-            var recursiveKeys = [];
-            for (var _i = 0, include_1 = include; _i < include_1.length; _i++) {
-                var file_15 = include_1[_i];
-                var spec = ts.normalizePath(ts.combinePaths(path, file_15));
-                if (excludeRegex && excludeRegex.test(spec)) {
-                    continue;
-                }
-                var match = getWildcardDirectoryFromSpec(spec, useCaseSensitiveFileNames);
-                if (match) {
-                    var key = match.key, flags = match.flags;
-                    var existingFlags = wildcardDirectories[key];
-                    if (existingFlags === undefined || existingFlags < flags) {
-                        wildcardDirectories[key] = flags;
-                        if (flags === 1 /* Recursive */) {
-                            recursiveKeys.push(key);
-                        }
-                    }
-                }
-            }
-            // Remove any subpaths under an existing recursively watched directory.
-            for (var key in wildcardDirectories) {
-                if (ts.hasProperty(wildcardDirectories, key)) {
-                    for (var _a = 0, recursiveKeys_1 = recursiveKeys; _a < recursiveKeys_1.length; _a++) {
-                        var recursiveKey = recursiveKeys_1[_a];
-                        if (key !== recursiveKey && ts.containsPath(recursiveKey, key, path, !useCaseSensitiveFileNames)) {
-                            delete wildcardDirectories[key];
-                        }
-                    }
-                }
-            }
-        }
-        return wildcardDirectories;
-    }
-    function getWildcardDirectoryFromSpec(spec, useCaseSensitiveFileNames) {
-        var match = wildcardDirectoryPattern.exec(spec);
-        if (match) {
             return {
-                key: useCaseSensitiveFileNames ? match[0] : match[0].toLowerCase(),
-                flags: watchRecursivePattern.test(spec) ? 1 /* Recursive */ : 0 /* None */
+                buildQueue: buildOrder,
+                dependencyMap: graph
             };
-        }
-        if (ts.isImplicitGlob(spec)) {
-            return { key: spec, flags: 1 /* Recursive */ };
-        }
-        return undefined;
-    }
-    /**
-     * Determines whether a literal or wildcard file has already been included that has a higher
-     * extension priority.
-     *
-     * @param file The path to the file.
-     * @param extensionPriority The priority of the extension.
-     * @param context The expansion context.
-     */
-    function hasFileWithHigherPriorityExtension(file, literalFiles, wildcardFiles, extensions, keyMapper) {
-        var extensionPriority = ts.getExtensionPriority(file, extensions);
-        var adjustedExtensionPriority = ts.adjustExtensionPriority(extensionPriority, extensions);
-        for (var i = 0 /* Highest */; i < adjustedExtensionPriority; i++) {
-            var higherPriorityExtension = extensions[i];
-            var higherPriorityPath = keyMapper(ts.changeExtension(file, higherPriorityExtension));
-            if (literalFiles.has(higherPriorityPath) || wildcardFiles.has(higherPriorityPath)) {
-                return true;
+            function visit(projPath, inCircularContext) {
+                if (inCircularContext === void 0) { inCircularContext = false; }
+                // Already visited
+                if (permanentMarks[projPath])
+                    return;
+                // Circular
+                if (temporaryMarks[projPath]) {
+                    if (!inCircularContext) {
+                        hadError = true;
+                        buildHost.error(ts.Diagnostics.Project_references_may_not_form_a_circular_graph_Cycle_detected_Colon_0, circularityReportStack.join("\r\n"));
+                        return;
+                    }
+                }
+                temporaryMarks[projPath] = true;
+                circularityReportStack.push(projPath);
+                var parsed = configFileCache.parseConfigFile(projPath);
+                if (parsed === undefined) {
+                    hadError = true;
+                    return;
+                }
+                if (parsed.projectReferences) {
+                    for (var _i = 0, _a = parsed.projectReferences; _i < _a.length; _i++) {
+                        var ref = _a[_i];
+                        var resolvedRefPath = resolveProjectName(ref.path);
+                        if (resolvedRefPath === undefined) {
+                            hadError = true;
+                            break;
+                        }
+                        visit(resolvedRefPath, inCircularContext || ref.circular);
+                        graph.addReference(projPath, resolvedRefPath);
+                    }
+                }
+                circularityReportStack.pop();
+                permanentMarks[projPath] = true;
+                buildOrder.push(projPath);
             }
         }
-        return false;
-    }
-    /**
-     * Removes files included via wildcard expansion with a lower extension priority that have
-     * already been included.
-     *
-     * @param file The path to the file.
-     * @param extensionPriority The priority of the extension.
-     * @param context The expansion context.
-     */
-    function removeWildcardFilesWithLowerPriorityExtension(file, wildcardFiles, extensions, keyMapper) {
-        var extensionPriority = ts.getExtensionPriority(file, extensions);
-        var nextExtensionPriority = ts.getNextLowestExtensionPriority(extensionPriority, extensions);
-        for (var i = nextExtensionPriority; i < extensions.length; i++) {
-            var lowerPriorityExtension = extensions[i];
-            var lowerPriorityPath = keyMapper(ts.changeExtension(file, lowerPriorityExtension));
-            wildcardFiles.delete(lowerPriorityPath);
-        }
-    }
-    /**
-     * Produces a cleaned version of compiler options with personally identifiying info (aka, paths) removed.
-     * Also converts enum values back to strings.
-     */
-    /* @internal */
-    function convertCompilerOptionsForTelemetry(opts) {
-        var out = {};
-        for (var key in opts) {
-            if (opts.hasOwnProperty(key)) {
-                var type = getOptionFromName(key);
-                if (type !== undefined) { // Ignore unknown options
-                    out[key] = getOptionValueWithEmptyStrings(opts[key], type);
+        function buildSingleProject(proj) {
+            if (context.options.dry) {
+                buildHost.message(ts.Diagnostics.A_non_dry_build_would_build_project_0, proj);
+                return BuildResultFlags.Success;
+            }
+            if (context.options.verbose)
+                buildHost.verbose(ts.Diagnostics.Building_project_0, proj);
+            var resultFlags = BuildResultFlags.None;
+            resultFlags |= BuildResultFlags.DeclarationOutputUnchanged;
+            var configFile = configFileCache.parseConfigFile(proj);
+            if (!configFile) {
+                // Failed to read the config file
+                resultFlags |= BuildResultFlags.ConfigFileErrors;
+                context.projectStatus.setValue(proj, { type: UpToDateStatusType.Unbuildable, reason: "Config file errors" });
+                return resultFlags;
+            }
+            if (configFile.fileNames.length === 0) {
+                // Nothing to build - must be a solution file, basically
+                return BuildResultFlags.None;
+            }
+            var programOptions = {
+                projectReferences: configFile.projectReferences,
+                host: compilerHost,
+                rootNames: configFile.fileNames,
+                options: configFile.options
+            };
+            var program = ts.createProgram(programOptions);
+            // Don't emit anything in the presence of syntactic errors or options diagnostics
+            var syntaxDiagnostics = program.getOptionsDiagnostics().concat(program.getSyntacticDiagnostics());
+            if (syntaxDiagnostics.length) {
+                resultFlags |= BuildResultFlags.SyntaxErrors;
+                for (var _i = 0, syntaxDiagnostics_1 = syntaxDiagnostics; _i < syntaxDiagnostics_1.length; _i++) {
+                    var diag = syntaxDiagnostics_1[_i];
+                    buildHost.errorDiagnostic(diag);
+                }
+                context.projectStatus.setValue(proj, { type: UpToDateStatusType.Unbuildable, reason: "Syntactic errors" });
+                return resultFlags;
+            }
+            // Don't emit .d.ts if there are decl file errors
+            if (program.getCompilerOptions().declaration) {
+                var declDiagnostics = program.getDeclarationDiagnostics();
+                if (declDiagnostics.length) {
+                    resultFlags |= BuildResultFlags.DeclarationEmitErrors;
+                    for (var _a = 0, declDiagnostics_1 = declDiagnostics; _a < declDiagnostics_1.length; _a++) {
+                        var diag = declDiagnostics_1[_a];
+                        buildHost.errorDiagnostic(diag);
+                    }
+                    context.projectStatus.setValue(proj, { type: UpToDateStatusType.Unbuildable, reason: "Declaration file errors" });
+                    return resultFlags;
                 }
             }
-        }
-        return out;
-    }
-    ts.convertCompilerOptionsForTelemetry = convertCompilerOptionsForTelemetry;
-    function getOptionValueWithEmptyStrings(value, option) {
-        switch (option.type) {
-            case "object": // "paths". Can't get any useful information from the value since we blank out strings, so just return "".
-                return "";
-            case "string": // Could be any arbitrary string -- use empty string instead.
-                return "";
-            case "number": // Allow numbers, but be sure to check it's actually a number.
-                return typeof value === "number" ? value : "";
-            case "boolean":
-                return typeof value === "boolean" ? value : "";
-            case "list":
-                var elementType_1 = option.element;
-                return ts.isArray(value) ? value.map(function (v) { return getOptionValueWithEmptyStrings(v, elementType_1); }) : "";
-            default:
-                return ts.forEachEntry(option.type, function (optionEnumValue, optionStringValue) {
-                    if (optionEnumValue === value) {
-                        return optionStringValue;
+            // Same as above but now for semantic diagnostics
+            var semanticDiagnostics = program.getSemanticDiagnostics();
+            if (semanticDiagnostics.length) {
+                resultFlags |= BuildResultFlags.TypeErrors;
+                for (var _b = 0, semanticDiagnostics_1 = semanticDiagnostics; _b < semanticDiagnostics_1.length; _b++) {
+                    var diag = semanticDiagnostics_1[_b];
+                    buildHost.errorDiagnostic(diag);
+                }
+                context.projectStatus.setValue(proj, { type: UpToDateStatusType.Unbuildable, reason: "Semantic errors" });
+                return resultFlags;
+            }
+            var newestDeclarationFileContentChangedTime = minimumDate;
+            program.emit(/*targetSourceFile*/ undefined, function (fileName, content, writeBom, onError) {
+                var priorChangeTime;
+                if (isDeclarationFile(fileName) && compilerHost.fileExists(fileName)) {
+                    if (compilerHost.readFile(fileName) === content) {
+                        // Check for unchanged .d.ts files
+                        resultFlags &= ~BuildResultFlags.DeclarationOutputUnchanged;
+                        priorChangeTime = compilerHost.getModifiedTime && compilerHost.getModifiedTime(fileName);
                     }
-                }); // TODO: GH#18217
+                }
+                compilerHost.writeFile(fileName, content, writeBom, onError, ts.emptyArray);
+                if (priorChangeTime !== undefined) {
+                    newestDeclarationFileContentChangedTime = newer(priorChangeTime, newestDeclarationFileContentChangedTime);
+                    context.unchangedOutputs.setValue(fileName, priorChangeTime);
+                }
+            });
+            context.projectStatus.setValue(proj, { type: UpToDateStatusType.UpToDate, newestDeclarationFileContentChangedTime: newestDeclarationFileContentChangedTime });
+            return resultFlags;
+        }
+        function updateOutputTimestamps(proj) {
+            if (context.options.dry) {
+                return buildHost.message(ts.Diagnostics.A_non_dry_build_would_build_project_0, proj.options.configFilePath);
+            }
+            if (context.options.verbose)
+                buildHost.verbose(ts.Diagnostics.Updating_output_timestamps_of_project_0, proj.options.configFilePath);
+            var now = new Date();
+            var outputs = getAllProjectOutputs(proj);
+            var priorNewestUpdateTime = minimumDate;
+            for (var _i = 0, outputs_2 = outputs; _i < outputs_2.length; _i++) {
+                var file = outputs_2[_i];
+                if (isDeclarationFile(file)) {
+                    priorNewestUpdateTime = newer(priorNewestUpdateTime, compilerHost.getModifiedTime(file));
+                }
+                compilerHost.setModifiedTime(file, now);
+            }
+            context.projectStatus.setValue(proj.options.configFilePath, { type: UpToDateStatusType.UpToDate, newestDeclarationFileContentChangedTime: priorNewestUpdateTime });
+        }
+        function getFilesToClean(configFileNames) {
+            var resolvedNames = resolveProjectNames(configFileNames);
+            if (resolvedNames === undefined)
+                return undefined;
+            // Get the same graph for cleaning we'd use for building
+            var graph = createDependencyGraph(resolvedNames);
+            if (graph === undefined)
+                return undefined;
+            var filesToDelete = [];
+            for (var _i = 0, _a = graph.buildQueue; _i < _a.length; _i++) {
+                var proj = _a[_i];
+                var parsed = configFileCache.parseConfigFile(proj);
+                if (parsed === undefined) {
+                    // File has gone missing; fine to ignore here
+                    continue;
+                }
+                var outputs = getAllProjectOutputs(parsed);
+                for (var _b = 0, outputs_3 = outputs; _b < outputs_3.length; _b++) {
+                    var output = outputs_3[_b];
+                    if (compilerHost.fileExists(output)) {
+                        filesToDelete.push(output);
+                    }
+                }
+            }
+            return filesToDelete;
+        }
+        function getAllProjectsInScope() {
+            var resolvedNames = resolveProjectNames(rootNames);
+            if (resolvedNames === undefined)
+                return undefined;
+            var graph = createDependencyGraph(resolvedNames);
+            if (graph === undefined)
+                return undefined;
+            return graph.buildQueue;
+        }
+        function cleanAllProjects() {
+            var resolvedNames = getAllProjectsInScope();
+            if (resolvedNames === undefined) {
+                return buildHost.message(ts.Diagnostics.Skipping_clean_because_not_all_projects_could_be_located);
+            }
+            var filesToDelete = getFilesToClean(resolvedNames);
+            if (filesToDelete === undefined) {
+                return buildHost.message(ts.Diagnostics.Skipping_clean_because_not_all_projects_could_be_located);
+            }
+            if (context.options.dry) {
+                return buildHost.message(ts.Diagnostics.A_non_dry_build_would_delete_the_following_files_Colon_0, filesToDelete.map(function (f) { return "\r\n * " + f; }).join(""));
+            }
+            // Do this check later to allow --clean --dry to function even if the host can't delete files
+            if (!compilerHost.deleteFile) {
+                throw new Error("Host does not support deleting files");
+            }
+            for (var _i = 0, filesToDelete_1 = filesToDelete; _i < filesToDelete_1.length; _i++) {
+                var output = filesToDelete_1[_i];
+                compilerHost.deleteFile(output);
+            }
+        }
+        function resolveProjectName(name) {
+            var fullPath = ts.resolvePath(compilerHost.getCurrentDirectory(), name);
+            if (compilerHost.fileExists(fullPath)) {
+                return fullPath;
+            }
+            var fullPathWithTsconfig = ts.combinePaths(fullPath, "tsconfig.json");
+            if (compilerHost.fileExists(fullPathWithTsconfig)) {
+                return fullPathWithTsconfig;
+            }
+            buildHost.error(ts.Diagnostics.File_0_not_found, relName(fullPath));
+            return undefined;
+        }
+        function resolveProjectNames(configFileNames) {
+            var resolvedNames = [];
+            for (var _i = 0, configFileNames_1 = configFileNames; _i < configFileNames_1.length; _i++) {
+                var name = configFileNames_1[_i];
+                var resolved = resolveProjectName(name);
+                if (resolved === undefined) {
+                    return undefined;
+                }
+                resolvedNames.push(resolved);
+            }
+            return resolvedNames;
+        }
+        function buildAllProjects() {
+            var graph = getGlobalDependencyGraph();
+            if (graph === undefined)
+                return;
+            var queue = graph.buildQueue;
+            reportBuildQueue(graph);
+            for (var _i = 0, queue_1 = queue; _i < queue_1.length; _i++) {
+                var next = queue_1[_i];
+                var proj = configFileCache.parseConfigFile(next);
+                if (proj === undefined) {
+                    break;
+                }
+                var status = getUpToDateStatus(proj);
+                verboseReportProjectStatus(next, status);
+                var projName = proj.options.configFilePath;
+                if (status.type === UpToDateStatusType.UpToDate && !context.options.force) {
+                    // Up to date, skip
+                    if (defaultOptions.dry) {
+                        // In a dry build, inform the user of this fact
+                        buildHost.message(ts.Diagnostics.Project_0_is_up_to_date, projName);
+                    }
+                    continue;
+                }
+                if (status.type === UpToDateStatusType.UpToDateWithUpstreamTypes && !context.options.force) {
+                    // Fake build
+                    updateOutputTimestamps(proj);
+                    continue;
+                }
+                if (status.type === UpToDateStatusType.UpstreamBlocked) {
+                    if (context.options.verbose)
+                        buildHost.verbose(ts.Diagnostics.Skipping_build_of_project_0_because_its_dependency_1_has_errors, projName, status.upstreamProjectName);
+                    continue;
+                }
+                if (status.type === UpToDateStatusType.ContainerOnly) {
+                    // Do nothing
+                    continue;
+                }
+                buildSingleProject(next);
+            }
+        }
+        /**
+         * Report the build ordering inferred from the current project graph if we're in verbose mode
+         */
+        function reportBuildQueue(graph) {
+            if (!context.options.verbose)
+                return;
+            var names = [];
+            for (var _i = 0, _a = graph.buildQueue; _i < _a.length; _i++) {
+                var name = _a[_i];
+                names.push(name);
+            }
+            if (context.options.verbose)
+                buildHost.verbose(ts.Diagnostics.Projects_in_this_build_Colon_0, names.map(function (s) { return "\r\n    * " + relName(s); }).join(""));
+        }
+        function relName(path) {
+            return ts.convertToRelativePath(path, compilerHost.getCurrentDirectory(), function (f) { return compilerHost.getCanonicalFileName(f); });
+        }
+        /**
+         * Report the up-to-date status of a project if we're in verbose mode
+         */
+        function verboseReportProjectStatus(configFileName, status) {
+            if (!context.options.verbose)
+                return;
+            switch (status.type) {
+                case UpToDateStatusType.OutOfDateWithSelf:
+                    return buildHost.verbose(ts.Diagnostics.Project_0_is_out_of_date_because_oldest_output_1_is_older_than_newest_input_2, relName(configFileName), relName(status.outOfDateOutputFileName), relName(status.newerInputFileName));
+                case UpToDateStatusType.OutOfDateWithUpstream:
+                    return buildHost.verbose(ts.Diagnostics.Project_0_is_out_of_date_because_oldest_output_1_is_older_than_newest_input_2, relName(configFileName), relName(status.outOfDateOutputFileName), relName(status.newerProjectName));
+                case UpToDateStatusType.OutputMissing:
+                    return buildHost.verbose(ts.Diagnostics.Project_0_is_out_of_date_because_output_file_1_does_not_exist, relName(configFileName), relName(status.missingOutputFileName));
+                case UpToDateStatusType.UpToDate:
+                    if (status.newestInputFileTime !== undefined) {
+                        return buildHost.verbose(ts.Diagnostics.Project_0_is_up_to_date_because_newest_input_1_is_older_than_oldest_output_2, relName(configFileName), relName(status.newestInputFileName), relName(status.oldestOutputFileName));
+                    }
+                    // Don't report anything for "up to date because it was already built" -- too verbose
+                    break;
+                case UpToDateStatusType.UpToDateWithUpstreamTypes:
+                    return buildHost.verbose(ts.Diagnostics.Project_0_is_up_to_date_with_d_ts_files_from_its_dependencies, relName(configFileName));
+                case UpToDateStatusType.UpstreamOutOfDate:
+                    return buildHost.verbose(ts.Diagnostics.Project_0_is_out_of_date_because_its_dependency_1_is_out_of_date, relName(configFileName), relName(status.upstreamProjectName));
+                case UpToDateStatusType.UpstreamBlocked:
+                    return buildHost.verbose(ts.Diagnostics.Project_0_can_t_be_built_because_its_dependency_1_has_errors, relName(configFileName), relName(status.upstreamProjectName));
+                case UpToDateStatusType.Unbuildable:
+                    return buildHost.verbose(ts.Diagnostics.Failed_to_parse_file_0_Colon_1, relName(configFileName), status.reason);
+                case UpToDateStatusType.ContainerOnly:
+                    // Don't report status on "solution" projects
+                    break;
+                default:
+                    ts.assertTypeIsNever(status);
+            }
         }
     }
+    ts.createSolutionBuilder = createSolutionBuilder;
 })(ts || (ts = {}));
+//# sourceMappingURL=compiler.js.map
+"use strict";
+var ts;
+(function (ts) {
+    var server;
+    (function (server) {
+        // tslint:disable variable-name
+        server.ActionSet = "action::set";
+        server.ActionInvalidate = "action::invalidate";
+        server.ActionPackageInstalled = "action::packageInstalled";
+        server.EventTypesRegistry = "event::typesRegistry";
+        server.EventBeginInstallTypes = "event::beginInstallTypes";
+        server.EventEndInstallTypes = "event::endInstallTypes";
+        server.EventInitializationFailed = "event::initializationFailed";
+        var Arguments;
+        (function (Arguments) {
+            Arguments.GlobalCacheLocation = "--globalTypingsCacheLocation";
+            Arguments.LogFile = "--logFile";
+            Arguments.EnableTelemetry = "--enableTelemetry";
+            Arguments.TypingSafeListLocation = "--typingSafeListLocation";
+            Arguments.TypesMapLocation = "--typesMapLocation";
+            /**
+             * This argument specifies the location of the NPM executable.
+             * typingsInstaller will run the command with `${npmLocation} install ...`.
+             */
+            Arguments.NpmLocation = "--npmLocation";
+        })(Arguments = server.Arguments || (server.Arguments = {}));
+        function hasArgument(argumentName) {
+            return ts.sys.args.indexOf(argumentName) >= 0;
+        }
+        server.hasArgument = hasArgument;
+        function findArgument(argumentName) {
+            var index = ts.sys.args.indexOf(argumentName);
+            return index >= 0 && index < ts.sys.args.length - 1
+                ? ts.sys.args[index + 1]
+                : undefined;
+        }
+        server.findArgument = findArgument;
+        /*@internal*/
+        function nowString() {
+            // E.g. "12:34:56.789"
+            var d = new Date();
+            return d.getHours() + ":" + d.getMinutes() + ":" + d.getSeconds() + "." + d.getMilliseconds();
+        }
+        server.nowString = nowString;
+    })(server = ts.server || (ts.server = {}));
+})(ts || (ts = {}));
+/* @internal */
+var ts;
+(function (ts) {
+    var JsTyping;
+    (function (JsTyping) {
+        /* @internal */
+        function isTypingUpToDate(cachedTyping, availableTypingVersions) {
+            var availableVersion = ts.Semver.parse(ts.getProperty(availableTypingVersions, "ts" + ts.versionMajorMinor) || ts.getProperty(availableTypingVersions, "latest"));
+            return !availableVersion.greaterThan(cachedTyping.version);
+        }
+        JsTyping.isTypingUpToDate = isTypingUpToDate;
+        /* @internal */
+        JsTyping.nodeCoreModuleList = [
+            "assert",
+            "async_hooks",
+            "buffer",
+            "child_process",
+            "cluster",
+            "console",
+            "constants",
+            "crypto",
+            "dgram",
+            "dns",
+            "domain",
+            "events",
+            "fs",
+            "http",
+            "https",
+            "http2",
+            "inspector",
+            "net",
+            "os",
+            "path",
+            "perf_hooks",
+            "process",
+            "punycode",
+            "querystring",
+            "readline",
+            "repl",
+            "stream",
+            "string_decoder",
+            "timers",
+            "tls",
+            "tty",
+            "url",
+            "util",
+            "v8",
+            "vm",
+            "zlib"
+        ];
+        /* @internal */
+        JsTyping.nodeCoreModules = ts.arrayToSet(JsTyping.nodeCoreModuleList);
+        function loadSafeList(host, safeListPath) {
+            var result = ts.readConfigFile(safeListPath, function (path) { return host.readFile(path); });
+            return ts.createMapFromTemplate(result.config);
+        }
+        JsTyping.loadSafeList = loadSafeList;
+        function loadTypesMap(host, typesMapPath) {
+            var result = ts.readConfigFile(typesMapPath, function (path) { return host.readFile(path); });
+            if (result.config) {
+                return ts.createMapFromTemplate(result.config.simpleMap);
+            }
+            return undefined;
+        }
+        JsTyping.loadTypesMap = loadTypesMap;
+        /**
+         * @param host is the object providing I/O related operations.
+         * @param fileNames are the file names that belong to the same project
+         * @param projectRootPath is the path to the project root directory
+         * @param safeListPath is the path used to retrieve the safe list
+         * @param packageNameToTypingLocation is the map of package names to their cached typing locations and installed versions
+         * @param typeAcquisition is used to customize the typing acquisition process
+         * @param compilerOptions are used as a source for typing inference
+         */
+        function discoverTypings(host, log, fileNames, projectRootPath, safeList, packageNameToTypingLocation, typeAcquisition, unresolvedImports, typesRegistry) {
+            if (!typeAcquisition || !typeAcquisition.enable) {
+                return { cachedTypingPaths: [], newTypingNames: [], filesToWatch: [] };
+            }
+            // A typing name to typing file path mapping
+            var inferredTypings = ts.createMap();
+            // Only infer typings for .js and .jsx files
+            fileNames = ts.mapDefined(fileNames, function (fileName) {
+                var path = ts.normalizePath(fileName);
+                if (ts.hasJavaScriptFileExtension(path)) {
+                    return path;
+                }
+            });
+            var filesToWatch = [];
+            if (typeAcquisition.include)
+                addInferredTypings(typeAcquisition.include, "Explicitly included types");
+            var exclude = typeAcquisition.exclude || [];
+            // Directories to search for package.json, bower.json and other typing information
+            var possibleSearchDirs = ts.arrayToSet(fileNames, ts.getDirectoryPath);
+            possibleSearchDirs.set(projectRootPath, true);
+            possibleSearchDirs.forEach(function (_true, searchDir) {
+                var packageJsonPath = ts.combinePaths(searchDir, "package.json");
+                getTypingNamesFromJson(packageJsonPath, filesToWatch);
+                var bowerJsonPath = ts.combinePaths(searchDir, "bower.json");
+                getTypingNamesFromJson(bowerJsonPath, filesToWatch);
+                var bowerComponentsPath = ts.combinePaths(searchDir, "bower_components");
+                getTypingNamesFromPackagesFolder(bowerComponentsPath, filesToWatch);
+                var nodeModulesPath = ts.combinePaths(searchDir, "node_modules");
+                getTypingNamesFromPackagesFolder(nodeModulesPath, filesToWatch);
+            });
+            getTypingNamesFromSourceFileNames(fileNames);
+            // add typings for unresolved imports
+            if (unresolvedImports) {
+                var module_1 = ts.deduplicate(unresolvedImports.map(function (moduleId) { return JsTyping.nodeCoreModules.has(moduleId) ? "node" : moduleId; }), ts.equateStringsCaseSensitive, ts.compareStringsCaseSensitive);
+                addInferredTypings(module_1, "Inferred typings from unresolved imports");
+            }
+            // Add the cached typing locations for inferred typings that are already installed
+            packageNameToTypingLocation.forEach(function (typing, name) {
+                var registryEntry = typesRegistry.get(name);
+                if (inferredTypings.has(name) && inferredTypings.get(name) === undefined && registryEntry !== undefined && isTypingUpToDate(typing, registryEntry)) {
+                    inferredTypings.set(name, typing.typingLocation);
+                }
+            });
+            // Remove typings that the user has added to the exclude list
+            for (var _i = 0, exclude_1 = exclude; _i < exclude_1.length; _i++) {
+                var excludeTypingName = exclude_1[_i];
+                var didDelete = inferredTypings.delete(excludeTypingName);
+                if (didDelete && log)
+                    log("Typing for " + excludeTypingName + " is in exclude list, will be ignored.");
+            }
+            var newTypingNames = [];
+            var cachedTypingPaths = [];
+            inferredTypings.forEach(function (inferred, typing) {
+                if (inferred !== undefined) {
+                    cachedTypingPaths.push(inferred);
+                }
+                else {
+                    newTypingNames.push(typing);
+                }
+            });
+            var result = { cachedTypingPaths: cachedTypingPaths, newTypingNames: newTypingNames, filesToWatch: filesToWatch };
+            if (log)
+                log("Result: " + JSON.stringify(result));
+            return result;
+            function addInferredTyping(typingName) {
+                if (!inferredTypings.has(typingName)) {
+                    inferredTypings.set(typingName, undefined); // TODO: GH#18217
+                }
+            }
+            function addInferredTypings(typingNames, message) {
+                if (log)
+                    log(message + ": " + JSON.stringify(typingNames));
+                ts.forEach(typingNames, addInferredTyping);
+            }
+            /**
+             * Get the typing info from common package manager json files like package.json or bower.json
+             */
+            function getTypingNamesFromJson(jsonPath, filesToWatch) {
+                if (!host.fileExists(jsonPath)) {
+                    return;
+                }
+                filesToWatch.push(jsonPath);
+                var jsonConfig = ts.readConfigFile(jsonPath, function (path) { return host.readFile(path); }).config;
+                var jsonTypingNames = ts.flatMap([jsonConfig.dependencies, jsonConfig.devDependencies, jsonConfig.optionalDependencies, jsonConfig.peerDependencies], ts.getOwnKeys);
+                addInferredTypings(jsonTypingNames, "Typing names in '" + jsonPath + "' dependencies");
+            }
+            /**
+             * Infer typing names from given file names. For example, the file name "jquery-min.2.3.4.js"
+             * should be inferred to the 'jquery' typing name; and "angular-route.1.2.3.js" should be inferred
+             * to the 'angular-route' typing name.
+             * @param fileNames are the names for source files in the project
+             */
+            function getTypingNamesFromSourceFileNames(fileNames) {
+                var fromFileNames = ts.mapDefined(fileNames, function (j) {
+                    if (!ts.hasJavaScriptFileExtension(j))
+                        return undefined;
+                    var inferredTypingName = ts.removeFileExtension(ts.getBaseFileName(j.toLowerCase()));
+                    var cleanedTypingName = ts.removeMinAndVersionNumbers(inferredTypingName);
+                    return safeList.get(cleanedTypingName);
+                });
+                if (fromFileNames.length) {
+                    addInferredTypings(fromFileNames, "Inferred typings from file names");
+                }
+                var hasJsxFile = ts.some(fileNames, function (f) { return ts.fileExtensionIs(f, ".jsx" /* Jsx */); });
+                if (hasJsxFile) {
+                    if (log)
+                        log("Inferred 'react' typings due to presence of '.jsx' extension");
+                    addInferredTyping("react");
+                }
+            }
+            /**
+             * Infer typing names from packages folder (ex: node_module, bower_components)
+             * @param packagesFolderPath is the path to the packages folder
+             */
+            function getTypingNamesFromPackagesFolder(packagesFolderPath, filesToWatch) {
+                filesToWatch.push(packagesFolderPath);
+                // Todo: add support for ModuleResolutionHost too
+                if (!host.directoryExists(packagesFolderPath)) {
+                    return;
+                }
+                // depth of 2, so we access `node_modules/foo` but not `node_modules/foo/bar`
+                var fileNames = host.readDirectory(packagesFolderPath, [".json" /* Json */], /*excludes*/ undefined, /*includes*/ undefined, /*depth*/ 2);
+                if (log)
+                    log("Searching for typing names in " + packagesFolderPath + "; all files: " + JSON.stringify(fileNames));
+                var packageNames = [];
+                for (var _i = 0, fileNames_1 = fileNames; _i < fileNames_1.length; _i++) {
+                    var fileName = fileNames_1[_i];
+                    var normalizedFileName = ts.normalizePath(fileName);
+                    var baseFileName = ts.getBaseFileName(normalizedFileName);
+                    if (baseFileName !== "package.json" && baseFileName !== "bower.json") {
+                        continue;
+                    }
+                    var result_1 = ts.readConfigFile(normalizedFileName, function (path) { return host.readFile(path); });
+                    var packageJson = result_1.config;
+                    // npm 3's package.json contains a "_requiredBy" field
+                    // we should include all the top level module names for npm 2, and only module names whose
+                    // "_requiredBy" field starts with "#" or equals "/" for npm 3.
+                    if (baseFileName === "package.json" && packageJson._requiredBy &&
+                        ts.filter(packageJson._requiredBy, function (r) { return r[0] === "#" || r === "/"; }).length === 0) {
+                        continue;
+                    }
+                    // If the package has its own d.ts typings, those will take precedence. Otherwise the package name will be used
+                    // to download d.ts files from DefinitelyTyped
+                    if (!packageJson.name) {
+                        continue;
+                    }
+                    var ownTypes = packageJson.types || packageJson.typings;
+                    if (ownTypes) {
+                        var absolutePath = ts.getNormalizedAbsolutePath(ownTypes, ts.getDirectoryPath(normalizedFileName));
+                        if (log)
+                            log("    Package '" + packageJson.name + "' provides its own types.");
+                        inferredTypings.set(packageJson.name, absolutePath);
+                    }
+                    else {
+                        packageNames.push(packageJson.name);
+                    }
+                }
+                addInferredTypings(packageNames, "    Found package names");
+            }
+        }
+        JsTyping.discoverTypings = discoverTypings;
+        var PackageNameValidationResult;
+        (function (PackageNameValidationResult) {
+            PackageNameValidationResult[PackageNameValidationResult["Ok"] = 0] = "Ok";
+            PackageNameValidationResult[PackageNameValidationResult["ScopedPackagesNotSupported"] = 1] = "ScopedPackagesNotSupported";
+            PackageNameValidationResult[PackageNameValidationResult["EmptyName"] = 2] = "EmptyName";
+            PackageNameValidationResult[PackageNameValidationResult["NameTooLong"] = 3] = "NameTooLong";
+            PackageNameValidationResult[PackageNameValidationResult["NameStartsWithDot"] = 4] = "NameStartsWithDot";
+            PackageNameValidationResult[PackageNameValidationResult["NameStartsWithUnderscore"] = 5] = "NameStartsWithUnderscore";
+            PackageNameValidationResult[PackageNameValidationResult["NameContainsNonURISafeCharacters"] = 6] = "NameContainsNonURISafeCharacters";
+        })(PackageNameValidationResult = JsTyping.PackageNameValidationResult || (JsTyping.PackageNameValidationResult = {}));
+        var maxPackageNameLength = 214;
+        /**
+         * Validates package name using rules defined at https://docs.npmjs.com/files/package.json
+         */
+        function validatePackageName(packageName) {
+            if (!packageName) {
+                return 2 /* EmptyName */;
+            }
+            if (packageName.length > maxPackageNameLength) {
+                return 3 /* NameTooLong */;
+            }
+            if (packageName.charCodeAt(0) === 46 /* dot */) {
+                return 4 /* NameStartsWithDot */;
+            }
+            if (packageName.charCodeAt(0) === 95 /* _ */) {
+                return 5 /* NameStartsWithUnderscore */;
+            }
+            // check if name is scope package like: starts with @ and has one '/' in the middle
+            // scoped packages are not currently supported
+            // TODO: when support will be added we'll need to split and check both scope and package name
+            if (/^@[^/]+\/[^/]+$/.test(packageName)) {
+                return 1 /* ScopedPackagesNotSupported */;
+            }
+            if (encodeURIComponent(packageName) !== packageName) {
+                return 6 /* NameContainsNonURISafeCharacters */;
+            }
+            return 0 /* Ok */;
+        }
+        JsTyping.validatePackageName = validatePackageName;
+        function renderPackageNameValidationFailure(result, typing) {
+            switch (result) {
+                case 2 /* EmptyName */:
+                    return "Package name '" + typing + "' cannot be empty";
+                case 3 /* NameTooLong */:
+                    return "Package name '" + typing + "' should be less than " + maxPackageNameLength + " characters";
+                case 4 /* NameStartsWithDot */:
+                    return "Package name '" + typing + "' cannot start with '.'";
+                case 5 /* NameStartsWithUnderscore */:
+                    return "Package name '" + typing + "' cannot start with '_'";
+                case 1 /* ScopedPackagesNotSupported */:
+                    return "Package '" + typing + "' is scoped and currently is not supported";
+                case 6 /* NameContainsNonURISafeCharacters */:
+                    return "Package name '" + typing + "' contains non URI safe characters";
+                case 0 /* Ok */:
+                    return ts.Debug.fail(); // Shouldn't have called this.
+                default:
+                    throw ts.Debug.assertNever(result);
+            }
+        }
+        JsTyping.renderPackageNameValidationFailure = renderPackageNameValidationFailure;
+    })(JsTyping = ts.JsTyping || (ts.JsTyping = {}));
+})(ts || (ts = {}));
+/* @internal */
+var ts;
+(function (ts) {
+    function stringToInt(str) {
+        var n = parseInt(str, 10);
+        if (isNaN(n)) {
+            throw new Error("Error in parseInt(" + JSON.stringify(str) + ")");
+        }
+        return n;
+    }
+    var isPrereleaseRegex = /^(.*)-next.\d+/;
+    var prereleaseSemverRegex = /^(\d+)\.(\d+)\.0-next.(\d+)$/;
+    var semverRegex = /^(\d+)\.(\d+)\.(\d+)$/;
+    var Semver = /** @class */ (function () {
+        function Semver(major, minor, patch, 
+        /**
+         * If true, this is `major.minor.0-next.patch`.
+         * If false, this is `major.minor.patch`.
+         */
+        isPrerelease) {
+            this.major = major;
+            this.minor = minor;
+            this.patch = patch;
+            this.isPrerelease = isPrerelease;
+        }
+        Semver.parse = function (semver) {
+            var isPrerelease = isPrereleaseRegex.test(semver);
+            var result = Semver.tryParse(semver, isPrerelease);
+            if (!result) {
+                throw new Error("Unexpected semver: " + semver + " (isPrerelease: " + isPrerelease + ")");
+            }
+            return result;
+        };
+        Semver.fromRaw = function (_a) {
+            var major = _a.major, minor = _a.minor, patch = _a.patch, isPrerelease = _a.isPrerelease;
+            return new Semver(major, minor, patch, isPrerelease);
+        };
+        // This must parse the output of `versionString`.
+        Semver.tryParse = function (semver, isPrerelease) {
+            // Per the semver spec <http://semver.org/#spec-item-2>:
+            // "A normal version number MUST take the form X.Y.Z where X, Y, and Z are non-negative integers, and MUST NOT contain leading zeroes."
+            var rgx = isPrerelease ? prereleaseSemverRegex : semverRegex;
+            var match = rgx.exec(semver);
+            return match ? new Semver(stringToInt(match[1]), stringToInt(match[2]), stringToInt(match[3]), isPrerelease) : undefined;
+        };
+        Object.defineProperty(Semver.prototype, "versionString", {
+            get: function () {
+                return this.isPrerelease ? this.major + "." + this.minor + ".0-next." + this.patch : this.major + "." + this.minor + "." + this.patch;
+            },
+            enumerable: true,
+            configurable: true
+        });
+        Semver.prototype.equals = function (sem) {
+            return this.major === sem.major && this.minor === sem.minor && this.patch === sem.patch && this.isPrerelease === sem.isPrerelease;
+        };
+        Semver.prototype.greaterThan = function (sem) {
+            return this.major > sem.major || this.major === sem.major
+                && (this.minor > sem.minor || this.minor === sem.minor
+                    && (!this.isPrerelease && sem.isPrerelease || this.isPrerelease === sem.isPrerelease
+                        && this.patch > sem.patch));
+        };
+        return Semver;
+    }());
+    ts.Semver = Semver;
+})(ts || (ts = {}));
+//# sourceMappingURL=jsTyping.js.map
+"use strict";
+var __assign = (this && this.__assign) || Object.assign || function(t) {
+    for (var s, i = 1, n = arguments.length; i < n; i++) {
+        s = arguments[i];
+        for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
+            t[p] = s[p];
+    }
+    return t;
+};
+var __extends = (this && this.__extends) || (function () {
+    var extendStatics = Object.setPrototypeOf ||
+        ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
+        function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
+    return function (d, b) {
+        extendStatics(d, b);
+        function __() { this.constructor = d; }
+        d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
+    };
+})();
 var ts;
 (function (ts) {
     var ScriptSnapshot;
@@ -85441,8 +87478,8 @@ var ts;
      * Gets the token whose text has range [start, end) and
      * position >= start and (position < end or (position === end && token is literal or keyword or identifier))
      */
-    function getTouchingPropertyName(sourceFile, position, includeJsDocComment) {
-        return getTouchingToken(sourceFile, position, includeJsDocComment, function (n) { return ts.isPropertyNameLiteral(n) || ts.isKeyword(n.kind); });
+    function getTouchingPropertyName(sourceFile, position) {
+        return getTouchingToken(sourceFile, position, /*includeJsDocComment*/ true, function (n) { return ts.isPropertyNameLiteral(n) || ts.isKeyword(n.kind); });
     }
     ts.getTouchingPropertyName = getTouchingPropertyName;
     /**
@@ -85519,8 +87556,8 @@ var ts;
                 return n;
             }
             var children = n.getChildren();
-            for (var _i = 0, children_3 = children; _i < children_3.length; _i++) {
-                var child = children_3[_i];
+            for (var _i = 0, children_1 = children; _i < children_1.length; _i++) {
+                var child = children_1[_i];
                 var shouldDiveInChildNode = 
                 // previous token is enclosed somewhere in the child
                 (child.pos <= previousToken.pos && child.end > previousToken.end) ||
@@ -85995,18 +88032,37 @@ var ts;
         return ts.createGetCanonicalFileName(hostUsesCaseSensitiveFileNames(host));
     }
     ts.hostGetCanonicalFileName = hostGetCanonicalFileName;
-    function makeImportIfNecessary(defaultImport, namedImports, moduleSpecifier, preferences) {
-        return defaultImport || namedImports && namedImports.length ? makeImport(defaultImport, namedImports, moduleSpecifier, preferences) : undefined;
+    function makeImportIfNecessary(defaultImport, namedImports, moduleSpecifier, quotePreference) {
+        return defaultImport || namedImports && namedImports.length ? makeImport(defaultImport, namedImports, moduleSpecifier, quotePreference) : undefined;
     }
     ts.makeImportIfNecessary = makeImportIfNecessary;
-    function makeImport(defaultImport, namedImports, moduleSpecifier, preferences) {
+    function makeImport(defaultImport, namedImports, moduleSpecifier, quotePreference) {
         return ts.createImportDeclaration(
         /*decorators*/ undefined, 
         /*modifiers*/ undefined, defaultImport || namedImports
             ? ts.createImportClause(defaultImport, namedImports && namedImports.length ? ts.createNamedImports(namedImports) : undefined)
-            : undefined, typeof moduleSpecifier === "string" ? ts.createLiteral(moduleSpecifier, preferences.quotePreference === "single") : moduleSpecifier);
+            : undefined, typeof moduleSpecifier === "string" ? makeStringLiteral(moduleSpecifier, quotePreference) : moduleSpecifier);
     }
     ts.makeImport = makeImport;
+    function makeStringLiteral(text, quotePreference) {
+        return ts.createLiteral(text, quotePreference === 0 /* Single */);
+    }
+    ts.makeStringLiteral = makeStringLiteral;
+    var QuotePreference;
+    (function (QuotePreference) {
+        QuotePreference[QuotePreference["Single"] = 0] = "Single";
+        QuotePreference[QuotePreference["Double"] = 1] = "Double";
+    })(QuotePreference = ts.QuotePreference || (ts.QuotePreference = {}));
+    function getQuotePreference(sourceFile, preferences) {
+        if (preferences.quotePreference) {
+            return preferences.quotePreference === "single" ? 0 /* Single */ : 1 /* Double */;
+        }
+        else {
+            var firstModuleSpecifier = ts.firstOrUndefined(sourceFile.imports);
+            return !!firstModuleSpecifier && !ts.isStringDoubleQuoted(firstModuleSpecifier, sourceFile) ? 0 /* Single */ : 1 /* Double */;
+        }
+    }
+    ts.getQuotePreference = getQuotePreference;
     function symbolNameNoDefault(symbol) {
         var escaped = symbolEscapedNameNoDefault(symbol);
         return escaped === undefined ? undefined : ts.unescapeLeadingUnderscores(escaped);
@@ -86364,14 +88420,14 @@ var ts;
         var visited = ts.visitEachChild(node, getSynthesizedDeepClone, ts.nullTransformationContext);
         if (visited === node) {
             // This only happens for leaf nodes - internal nodes always see their children change.
-            var clone_7 = ts.getSynthesizedClone(node);
-            if (ts.isStringLiteral(clone_7)) {
-                clone_7.textSourceNode = node;
+            var clone_1 = ts.getSynthesizedClone(node);
+            if (ts.isStringLiteral(clone_1)) {
+                clone_1.textSourceNode = node;
             }
-            else if (ts.isNumericLiteral(clone_7)) {
-                clone_7.numericLiteralFlags = node.numericLiteralFlags;
+            else if (ts.isNumericLiteral(clone_1)) {
+                clone_1.numericLiteralFlags = node.numericLiteralFlags;
             }
-            return ts.setTextRange(clone_7, node);
+            return ts.setTextRange(clone_1, node);
         }
         // PERF: As an optimization, rather than calling getSynthesizedClone, we'll update
         // the new node created by visitEachChild with the extra changes getSynthesizedClone
@@ -86712,7 +88768,7 @@ var ts;
         var lastEnd = 0;
         for (var i = 0; i < dense.length; i += 3) {
             var start = dense[i];
-            var length_5 = dense[i + 1];
+            var length_1 = dense[i + 1];
             var type = dense[i + 2];
             // Make a whitespace entry between the last item and this one.
             if (lastEnd >= 0) {
@@ -86721,8 +88777,8 @@ var ts;
                     entries.push({ length: whitespaceLength_1, classification: ts.TokenClass.Whitespace });
                 }
             }
-            entries.push({ length: length_5, classification: convertClassification(type) });
-            lastEnd = start + length_5;
+            entries.push({ length: length_1, classification: convertClassification(type) });
+            lastEnd = start + length_1;
         }
         var whitespaceLength = text.length - lastEnd;
         if (whitespaceLength > 0) {
@@ -87454,8 +89510,8 @@ var ts;
                          * both foo.ts and foo.tsx become foo
                          */
                         var foundFiles = ts.createMap();
-                        for (var _i = 0, files_3 = files; _i < files_3.length; _i++) {
-                            var filePath = files_3[_i];
+                        for (var _i = 0, files_1 = files; _i < files_1.length; _i++) {
+                            var filePath = files_1[_i];
                             filePath = ts.normalizePath(filePath);
                             if (exclude && ts.comparePaths(filePath, exclude, scriptPath, ignoreCase) === 0 /* EqualTo */) {
                                 continue;
@@ -87473,8 +89529,8 @@ var ts;
                     var directories = tryGetDirectories(host, baseDirectory);
                     if (directories) {
                         for (var _a = 0, directories_1 = directories; _a < directories_1.length; _a++) {
-                            var directory_2 = directories_1[_a];
-                            var directoryName = ts.getBaseFileName(ts.normalizePath(directory_2));
+                            var directory = directories_1[_a];
+                            var directoryName = ts.getBaseFileName(ts.normalizePath(directory));
                             if (directoryName !== "@types") {
                                 result.push(nameAndKind(directoryName, "directory" /* directory */));
                             }
@@ -87501,7 +89557,7 @@ var ts;
                     for (var path in paths) {
                         var patterns = paths[path];
                         if (paths.hasOwnProperty(path) && patterns) {
-                            var _loop_12 = function (name, kind) {
+                            var _loop_1 = function (name, kind) {
                                 // Path mappings may provide a duplicate way to get to something we've already added, so don't add again.
                                 if (!result.some(function (entry) { return entry.name === name; })) {
                                     result.push(nameAndKind(name, kind));
@@ -87509,7 +89565,7 @@ var ts;
                             };
                             for (var _i = 0, _a = getCompletionsForPathMapping(path, patterns, fragment, baseUrl, fileExtensions, host); _i < _a.length; _i++) {
                                 var _b = _a[_i], name = _b.name, kind = _b.kind;
-                                _loop_12(name, kind);
+                                _loop_1(name, kind);
                             }
                         }
                     }
@@ -87525,7 +89581,7 @@ var ts;
                     // (But do if we didn't find anything, e.g. 'package.json' missing.)
                     var foundGlobal = false;
                     if (fragmentDirectory === undefined) {
-                        var _loop_13 = function (moduleName) {
+                        var _loop_2 = function (moduleName) {
                             if (!result.some(function (entry) { return entry.name === moduleName; })) {
                                 foundGlobal = true;
                                 result.push(nameAndKind(moduleName, "external module name" /* externalModuleName */));
@@ -87533,7 +89589,7 @@ var ts;
                         };
                         for (var _e = 0, _f = enumerateNodeModulesVisibleToScript(host, scriptPath); _e < _f.length; _e++) {
                             var moduleName = _f[_e];
-                            _loop_13(moduleName);
+                            _loop_2(moduleName);
                         }
                     }
                     if (!foundGlobal) {
@@ -87651,8 +89707,8 @@ var ts;
                     }
                     catch ( /* Wrap in try catch because getEffectiveTypeRoots touches the filesystem */_b) { /* Wrap in try catch because getEffectiveTypeRoots touches the filesystem */ }
                     if (typeRoots) {
-                        for (var _c = 0, typeRoots_2 = typeRoots; _c < typeRoots_2.length; _c++) {
-                            var root = typeRoots_2[_c];
+                        for (var _c = 0, typeRoots_1 = typeRoots; _c < typeRoots_1.length; _c++) {
+                            var root = typeRoots_1[_c];
                             getCompletionEntriesFromDirectories(root);
                         }
                     }
@@ -87875,7 +89931,7 @@ var ts;
             return { isGlobalCompletion: false, isMemberCompletion: false, isNewIdentifierLocation: false, entries: entries };
         }
         function completionInfoFromData(sourceFile, typeChecker, compilerOptions, log, completionData, preferences) {
-            var symbols = completionData.symbols, completionKind = completionData.completionKind, isInSnippetScope = completionData.isInSnippetScope, isNewIdentifierLocation = completionData.isNewIdentifierLocation, location = completionData.location, propertyAccessToConvert = completionData.propertyAccessToConvert, keywordFilters = completionData.keywordFilters, symbolToOriginInfoMap = completionData.symbolToOriginInfoMap, recommendedCompletion = completionData.recommendedCompletion, isJsxInitializer = completionData.isJsxInitializer;
+            var symbols = completionData.symbols, completionKind = completionData.completionKind, isInSnippetScope = completionData.isInSnippetScope, isNewIdentifierLocation = completionData.isNewIdentifierLocation, location = completionData.location, propertyAccessToConvert = completionData.propertyAccessToConvert, keywordFilters = completionData.keywordFilters, literals = completionData.literals, symbolToOriginInfoMap = completionData.symbolToOriginInfoMap, recommendedCompletion = completionData.recommendedCompletion, isJsxInitializer = completionData.isJsxInitializer;
             if (sourceFile.languageVariant === 1 /* JSX */ && location && location.parent && ts.isJsxClosingElement(location.parent)) {
                 // In the TypeScript JSX element, if such element is not defined. When users query for completion at closing tag,
                 // instead of simply giving unknown value, the completion will return the tag-name of an associated opening-element.
@@ -87910,6 +89966,10 @@ var ts;
             if (keywordFilters !== 0 /* None */ || !isMemberCompletion) {
                 ts.addRange(entries, getKeywordCompletions(keywordFilters));
             }
+            for (var _i = 0, literals_1 = literals; _i < literals_1.length; _i++) {
+                var literal = literals_1[_i];
+                entries.push(createCompletionEntryForLiteral(literal));
+            }
             return { isGlobalCompletion: isInSnippetScope, isMemberCompletion: isMemberCompletion, isNewIdentifierLocation: isNewIdentifierLocation, entries: entries };
         }
         function isUncheckedFile(sourceFile, compilerOptions) {
@@ -87942,6 +90002,10 @@ var ts;
                 }
             });
         }
+        var completionNameForLiteral = JSON.stringify;
+        function createCompletionEntryForLiteral(literal) {
+            return { name: completionNameForLiteral(literal), kind: "string" /* string */, kindModifiers: "" /* none */, sortText: "0" };
+        }
         function createCompletionEntry(symbol, location, sourceFile, typeChecker, target, kind, origin, recommendedCompletion, propertyAccessToConvert, isJsxInitializer, preferences) {
             var info = getCompletionEntryDisplayNameForSymbol(symbol, target, origin, kind);
             if (!info) {
@@ -88021,8 +90085,8 @@ var ts;
             // Based on the order we add things we will always see locals first, then globals, then module exports.
             // So adding a completion for a local will prevent us from adding completions for external module exports sharing the same name.
             var uniques = ts.createMap();
-            for (var _i = 0, symbols_4 = symbols; _i < symbols_4.length; _i++) {
-                var symbol = symbols_4[_i];
+            for (var _i = 0, symbols_1 = symbols; _i < symbols_1.length; _i++) {
+                var symbol = symbols_1[_i];
                 var origin = symbolToOriginInfoMap ? symbolToOriginInfoMap[ts.getSymbolId(symbol)] : undefined;
                 var entry = createCompletionEntry(symbol, location, sourceFile, typeChecker, target, kind, origin, recommendedCompletion, propertyAccessToConvert, isJsxInitializer, preferences);
                 if (!entry) {
@@ -88082,7 +90146,7 @@ var ts;
                 case 178 /* LiteralType */:
                     switch (node.parent.parent.kind) {
                         case 162 /* TypeReference */:
-                            return { kind: 2 /* Types */, types: getStringLiteralTypes(typeChecker.getTypeArgumentConstraint(node.parent), typeChecker), isNewIdentifier: false };
+                            return { kind: 2 /* Types */, types: getStringLiteralTypes(typeChecker.getTypeArgumentConstraint(node.parent)), isNewIdentifier: false };
                         case 176 /* IndexedAccessType */:
                             // Get all apparent property names
                             // i.e. interface Foo {
@@ -88152,7 +90216,7 @@ var ts;
             function fromContextualType() {
                 // Get completion for string literal from string literal type
                 // i.e. var x: "hi" | "hello" = "/*completion position*/"
-                return { kind: 2 /* Types */, types: getStringLiteralTypes(getContextualTypeFromParent(node, typeChecker), typeChecker), isNewIdentifier: false };
+                return { kind: 2 /* Types */, types: getStringLiteralTypes(getContextualTypeFromParent(node, typeChecker)), isNewIdentifier: false };
             }
         }
         function getStringLiteralCompletionsFromSignature(argumentInfo, checker) {
@@ -88165,20 +90229,20 @@ var ts;
                     return;
                 var type = checker.getParameterType(candidate, argumentInfo.argumentIndex);
                 isNewIdentifier = isNewIdentifier || !!(type.flags & 4 /* String */);
-                return getStringLiteralTypes(type, checker, uniques);
+                return getStringLiteralTypes(type, uniques);
             });
             return { kind: 2 /* Types */, types: types, isNewIdentifier: isNewIdentifier };
         }
         function stringLiteralCompletionsFromProperties(type) {
             return type && { kind: 1 /* Properties */, symbols: type.getApparentProperties(), hasIndexSignature: hasIndexSignature(type) };
         }
-        function getStringLiteralTypes(type, typeChecker, uniques) {
+        function getStringLiteralTypes(type, uniques) {
             if (uniques === void 0) { uniques = ts.createMap(); }
             if (!type)
                 return ts.emptyArray;
             type = ts.skipConstraint(type);
             return type.isUnion()
-                ? ts.flatMap(type.types, function (t) { return getStringLiteralTypes(t, typeChecker, uniques); })
+                ? ts.flatMap(type.types, function (t) { return getStringLiteralTypes(t, uniques); })
                 : type.isStringLiteral() && !(type.flags & 512 /* EnumLiteral */) && ts.addToSeen(uniques, type.value)
                     ? [type]
                     : ts.emptyArray;
@@ -88192,7 +90256,10 @@ var ts;
             if (completionData.kind !== 0 /* Data */) {
                 return { type: "request", request: completionData };
             }
-            var symbols = completionData.symbols, location = completionData.location, completionKind = completionData.completionKind, symbolToOriginInfoMap = completionData.symbolToOriginInfoMap, previousToken = completionData.previousToken, isJsxInitializer = completionData.isJsxInitializer;
+            var symbols = completionData.symbols, literals = completionData.literals, location = completionData.location, completionKind = completionData.completionKind, symbolToOriginInfoMap = completionData.symbolToOriginInfoMap, previousToken = completionData.previousToken, isJsxInitializer = completionData.isJsxInitializer;
+            var literal = ts.find(literals, function (l) { return completionNameForLiteral(l) === entryId.name; });
+            if (literal !== undefined)
+                return { type: "literal", literal: literal };
             // Find the symbol with the matching entry name.
             // We don't need to perform character checks here because we're only comparing the
             // name against 'entryName' (which is known to be good), not building a new
@@ -88244,12 +90311,21 @@ var ts;
                     var _a = getCompletionEntryCodeActionsAndSourceDisplay(symbolToOriginInfoMap, symbol, program, typeChecker, host, compilerOptions, sourceFile, previousToken, formatContext, getCanonicalFileName, program.getSourceFiles(), preferences), codeActions = _a.codeActions, sourceDisplay = _a.sourceDisplay;
                     return createCompletionDetailsForSymbol(symbol, typeChecker, sourceFile, location, cancellationToken, codeActions, sourceDisplay); // TODO: GH#18217
                 }
+                case "literal": {
+                    var literal = symbolCompletion.literal;
+                    return createSimpleDetails(completionNameForLiteral(literal), "string" /* string */, typeof literal === "string" ? ts.SymbolDisplayPartKind.stringLiteral : ts.SymbolDisplayPartKind.numericLiteral);
+                }
                 case "none":
                     // Didn't find a symbol with this name.  See if we can find a keyword instead.
-                    return allKeywordsCompletions().some(function (c) { return c.name === name; }) ? createCompletionDetails(name, "" /* none */, "keyword" /* keyword */, [ts.displayPart(name, ts.SymbolDisplayPartKind.keyword)]) : undefined;
+                    return allKeywordsCompletions().some(function (c) { return c.name === name; }) ? createSimpleDetails(name, "keyword" /* keyword */, ts.SymbolDisplayPartKind.keyword) : undefined;
+                default:
+                    ts.Debug.assertNever(symbolCompletion);
             }
         }
         Completions.getCompletionEntryDetails = getCompletionEntryDetails;
+        function createSimpleDetails(name, kind, kind2) {
+            return createCompletionDetails(name, "" /* none */, kind, [ts.displayPart(name, kind2)]);
+        }
         function createCompletionDetailsForSymbol(symbol, checker, sourceFile, location, cancellationToken, codeActions, sourceDisplay) {
             var _a = checker.runWithCancellationToken(cancellationToken, function (checker) {
                 return ts.SymbolDisplay.getSymbolDisplayPartsDocumentationAndSymbolKind(checker, symbol, sourceFile, location, location, 7 /* All */);
@@ -88306,22 +90382,21 @@ var ts;
             CompletionKind[CompletionKind["String"] = 4] = "String";
             CompletionKind[CompletionKind["None"] = 5] = "None";
         })(CompletionKind || (CompletionKind = {}));
-        function getRecommendedCompletion(currentToken, position, sourceFile, checker) {
-            var contextualType = getContextualType(currentToken, position, sourceFile, checker);
+        function getRecommendedCompletion(previousToken, contextualType, checker) {
             // For a union, return the first one with a recommended completion.
             return ts.firstDefined(contextualType && (contextualType.isUnion() ? contextualType.types : [contextualType]), function (type) {
                 var symbol = type && type.symbol;
                 // Don't include make a recommended completion for an abstract class
                 return symbol && (symbol.flags & (8 /* EnumMember */ | 384 /* Enum */ | 32 /* Class */) && !ts.isAbstractConstructorSymbol(symbol))
-                    ? getFirstSymbolInChain(symbol, currentToken, checker)
+                    ? getFirstSymbolInChain(symbol, previousToken, checker)
                     : undefined;
             });
         }
-        function getContextualType(currentToken, position, sourceFile, checker) {
-            var parent = currentToken.parent;
-            switch (currentToken.kind) {
+        function getContextualType(previousToken, position, sourceFile, checker) {
+            var parent = previousToken.parent;
+            switch (previousToken.kind) {
                 case 71 /* Identifier */:
-                    return getContextualTypeFromParent(currentToken, checker);
+                    return getContextualTypeFromParent(previousToken, checker);
                 case 58 /* EqualsToken */:
                     switch (parent.kind) {
                         case 232 /* VariableDeclaration */:
@@ -88340,14 +90415,14 @@ var ts;
                 case 17 /* OpenBraceToken */:
                     return ts.isJsxExpression(parent) && parent.parent.kind !== 255 /* JsxElement */ ? checker.getContextualTypeForJsxAttribute(parent.parent) : undefined;
                 default:
-                    var argInfo = ts.SignatureHelp.getArgumentInfoForCompletions(currentToken, position, sourceFile);
+                    var argInfo = ts.SignatureHelp.getArgumentInfoForCompletions(previousToken, position, sourceFile);
                     return argInfo
                         // At `,`, treat this as the next argument after the comma.
-                        ? checker.getContextualTypeForArgumentAtIndex(argInfo.invocation, argInfo.argumentIndex + (currentToken.kind === 26 /* CommaToken */ ? 1 : 0))
-                        : isEqualityOperatorKind(currentToken.kind) && ts.isBinaryExpression(parent) && isEqualityOperatorKind(parent.operatorToken.kind)
+                        ? checker.getContextualTypeForArgumentAtIndex(argInfo.invocation, argInfo.argumentIndex + (previousToken.kind === 26 /* CommaToken */ ? 1 : 0))
+                        : isEqualityOperatorKind(previousToken.kind) && ts.isBinaryExpression(parent) && isEqualityOperatorKind(parent.operatorToken.kind)
                             // completion at `x ===/**/` should be for the right side
                             ? checker.getTypeAtLocation(parent.left)
-                            : checker.getContextualType(currentToken);
+                            : checker.getContextualType(previousToken);
             }
         }
         function getContextualTypeFromParent(node, checker) {
@@ -88459,9 +90534,9 @@ var ts;
             // Check if the caret is at the end of an identifier; this is a partial identifier that we want to complete: e.g. a.toS|
             // Skip this partial identifier and adjust the contextToken to the token that precedes it.
             if (contextToken && position <= contextToken.end && (ts.isIdentifier(contextToken) || ts.isKeyword(contextToken.kind))) {
-                var start_4 = ts.timestamp();
+                var start_1 = ts.timestamp();
                 contextToken = ts.findPrecedingToken(contextToken.getFullStart(), sourceFile, /*startNode*/ undefined, insideJsDocTagTypeExpression); // TODO: GH#18217
-                log("getCompletionData: Get previous token 2: " + (ts.timestamp() - start_4));
+                log("getCompletionData: Get previous token 2: " + (ts.timestamp() - start_1));
             }
             // Find the node where completion is requested on.
             // Also determine whether we are trying to complete with members of that node
@@ -88472,7 +90547,7 @@ var ts;
             var isRightOfOpenTag = false;
             var isStartingCloseTag = false;
             var isJsxInitializer = false;
-            var location = ts.getTouchingPropertyName(sourceFile, position, insideJsDocTagTypeExpression); // TODO: GH#15853
+            var location = ts.getTouchingPropertyName(sourceFile, position);
             if (contextToken) {
                 // Bail out if this is a known invalid completion location
                 if (isCompletionListBlocker(contextToken)) {
@@ -88591,8 +90666,10 @@ var ts;
                 }
             }
             log("getCompletionData: Semantic work: " + (ts.timestamp() - semanticStart));
-            var recommendedCompletion = previousToken && getRecommendedCompletion(previousToken, position, sourceFile, typeChecker);
-            return { kind: 0 /* Data */, symbols: symbols, completionKind: completionKind, isInSnippetScope: isInSnippetScope, propertyAccessToConvert: propertyAccessToConvert, isNewIdentifierLocation: isNewIdentifierLocation, location: location, keywordFilters: keywordFilters, symbolToOriginInfoMap: symbolToOriginInfoMap, recommendedCompletion: recommendedCompletion, previousToken: previousToken, isJsxInitializer: isJsxInitializer };
+            var contextualType = previousToken && getContextualType(previousToken, position, sourceFile, typeChecker);
+            var literals = ts.mapDefined(contextualType && (contextualType.isUnion() ? contextualType.types : [contextualType]), function (t) { return t.isLiteral() ? t.value : undefined; });
+            var recommendedCompletion = previousToken && contextualType && getRecommendedCompletion(previousToken, contextualType, typeChecker);
+            return { kind: 0 /* Data */, symbols: symbols, completionKind: completionKind, isInSnippetScope: isInSnippetScope, propertyAccessToConvert: propertyAccessToConvert, isNewIdentifierLocation: isNewIdentifierLocation, location: location, keywordFilters: keywordFilters, literals: literals, symbolToOriginInfoMap: symbolToOriginInfoMap, recommendedCompletion: recommendedCompletion, previousToken: previousToken, isJsxInitializer: isJsxInitializer };
             function isTagWithTypeExpression(tag) {
                 switch (tag.kind) {
                     case 293 /* JSDocParameterTag */:
@@ -88627,9 +90704,9 @@ var ts;
                                 function (symbol) { return isValidTypeAccess_1(symbol) || isValidValueAccess_1(symbol); } :
                                 isTypeLocation ? isValidTypeAccess_1 : isValidValueAccess_1;
                             for (var _i = 0, exportedSymbols_1 = exportedSymbols; _i < exportedSymbols_1.length; _i++) {
-                                var symbol_2 = exportedSymbols_1[_i];
-                                if (isValidAccess(symbol_2)) {
-                                    symbols.push(symbol_2);
+                                var symbol_1 = exportedSymbols_1[_i];
+                                if (isValidAccess(symbol_1)) {
+                                    symbols.push(symbol_1);
                                 }
                             }
                             // If the module is merged with a value, we must get the type of the class and add its propertes (for inherited static methods).
@@ -88650,7 +90727,7 @@ var ts;
                 }
             }
             function addTypeProperties(type) {
-                isNewIdentifierLocation = hasIndexSignature(type);
+                isNewIdentifierLocation = !!type.getStringIndexType();
                 if (isUncheckedFile) {
                     // In javascript files, for union types, we don't just get the members that
                     // the individual types have in common, we also include all the members that
@@ -89716,7 +91793,7 @@ var ts;
     var DocumentHighlights;
     (function (DocumentHighlights) {
         function getDocumentHighlights(program, cancellationToken, sourceFile, position, sourceFilesToSearch) {
-            var node = ts.getTouchingPropertyName(sourceFile, position, /*includeJsDocComment*/ true);
+            var node = ts.getTouchingPropertyName(sourceFile, position);
             if (node.parent && (ts.isJsxOpeningElement(node.parent) && node.parent.tagName === node || ts.isJsxClosingElement(node.parent))) {
                 // For a JSX element, just highlight the matching tag, not all references.
                 var _a = node.parent.parent, openingElement = _a.openingElement, closingElement = _a.closingElement;
@@ -90580,8 +92657,8 @@ var ts;
         function findModuleReferences(program, sourceFiles, searchModuleSymbol) {
             var refs = [];
             var checker = program.getTypeChecker();
-            for (var _i = 0, sourceFiles_5 = sourceFiles; _i < sourceFiles_5.length; _i++) {
-                var referencingFile = sourceFiles_5[_i];
+            for (var _i = 0, sourceFiles_1 = sourceFiles; _i < sourceFiles_1.length; _i++) {
+                var referencingFile = sourceFiles_1[_i];
                 var searchSourceFile = searchModuleSymbol.valueDeclaration;
                 if (searchSourceFile.kind === 274 /* SourceFile */) {
                     for (var _a = 0, _b = referencingFile.referencedFiles; _a < _b.length; _a++) {
@@ -90611,8 +92688,8 @@ var ts;
         /** Returns a map from a module symbol Id to all import statements that directly reference the module. */
         function getDirectImportsMap(sourceFiles, checker, cancellationToken) {
             var map = ts.createMap();
-            for (var _i = 0, sourceFiles_6 = sourceFiles; _i < sourceFiles_6.length; _i++) {
-                var sourceFile = sourceFiles_6[_i];
+            for (var _i = 0, sourceFiles_2 = sourceFiles; _i < sourceFiles_2.length; _i++) {
+                var sourceFile = sourceFiles_2[_i];
                 cancellationToken.throwIfCancellationRequested();
                 forEachImport(sourceFile, function (importDecl, moduleSpecifier) {
                     var moduleSymbol = checker.getSymbolAtLocation(moduleSpecifier);
@@ -90880,7 +92957,7 @@ var ts;
         }
         FindAllReferences.nodeEntry = nodeEntry;
         function findReferencedSymbols(program, cancellationToken, sourceFiles, sourceFile, position) {
-            var node = ts.getTouchingPropertyName(sourceFile, position, /*includeJsDocComment*/ true);
+            var node = ts.getTouchingPropertyName(sourceFile, position);
             var referencedSymbols = FindAllReferences.Core.getReferencedSymbolsForNode(position, node, program, sourceFiles, cancellationToken);
             var checker = program.getTypeChecker();
             return !referencedSymbols || !referencedSymbols.length ? undefined : ts.mapDefined(referencedSymbols, function (_a) {
@@ -90894,8 +92971,7 @@ var ts;
         }
         FindAllReferences.findReferencedSymbols = findReferencedSymbols;
         function getImplementationsAtPosition(program, cancellationToken, sourceFiles, sourceFile, position) {
-            // A node in a JSDoc comment can't have an implementation anyway.
-            var node = ts.getTouchingPropertyName(sourceFile, position, /*includeJsDocComment*/ false);
+            var node = ts.getTouchingPropertyName(sourceFile, position);
             var referenceEntries = getImplementationReferenceEntries(program, cancellationToken, sourceFiles, node, position);
             var checker = program.getTypeChecker();
             return ts.map(referenceEntries, function (entry) { return toImplementationLocation(entry, checker); });
@@ -90909,9 +92985,9 @@ var ts;
             // If invoked directly on a shorthand property assignment, then return
             // the declaration of the symbol being assigned (not the symbol being assigned to).
             if (node.parent.kind === 271 /* ShorthandPropertyAssignment */) {
-                var result_5 = [];
-                FindAllReferences.Core.getReferenceEntriesForShorthandPropertyAssignment(node, checker, function (node) { return result_5.push(nodeEntry(node)); });
-                return result_5;
+                var result_1 = [];
+                FindAllReferences.Core.getReferenceEntriesForShorthandPropertyAssignment(node, checker, function (node) { return result_1.push(nodeEntry(node)); });
+                return result_1;
             }
             else if (node.kind === 97 /* SuperKeyword */ || ts.isSuperProperty(node.parent)) {
                 // References to and accesses on the super keyword only have one possible implementation, so no
@@ -90925,7 +93001,7 @@ var ts;
             }
         }
         function findReferencedEntries(program, cancellationToken, sourceFiles, sourceFile, position, options) {
-            var node = ts.getTouchingPropertyName(sourceFile, position, /*includeJsDocComment*/ true);
+            var node = ts.getTouchingPropertyName(sourceFile, position);
             return ts.map(flattenEntries(FindAllReferences.Core.getReferencedSymbolsForNode(position, node, program, sourceFiles, cancellationToken, options)), toReferenceEntry);
         }
         FindAllReferences.findReferencedEntries = findReferencedEntries;
@@ -90944,27 +93020,27 @@ var ts;
                     case "symbol": {
                         var symbol = def.symbol;
                         var _a = getDefinitionKindAndDisplayParts(symbol, checker, originalNode), displayParts_1 = _a.displayParts, kind_1 = _a.kind;
-                        var name_3 = displayParts_1.map(function (p) { return p.text; }).join("");
-                        return { node: symbol.declarations ? ts.getNameOfDeclaration(ts.first(symbol.declarations)) || ts.first(symbol.declarations) : originalNode, name: name_3, kind: kind_1, displayParts: displayParts_1 };
+                        var name_1 = displayParts_1.map(function (p) { return p.text; }).join("");
+                        return { node: symbol.declarations ? ts.getNameOfDeclaration(ts.first(symbol.declarations)) || ts.first(symbol.declarations) : originalNode, name: name_1, kind: kind_1, displayParts: displayParts_1 };
                     }
                     case "label": {
-                        var node_3 = def.node;
-                        return { node: node_3, name: node_3.text, kind: "label" /* label */, displayParts: [ts.displayPart(node_3.text, ts.SymbolDisplayPartKind.text)] };
+                        var node_1 = def.node;
+                        return { node: node_1, name: node_1.text, kind: "label" /* label */, displayParts: [ts.displayPart(node_1.text, ts.SymbolDisplayPartKind.text)] };
                     }
                     case "keyword": {
-                        var node_4 = def.node;
-                        var name_4 = ts.tokenToString(node_4.kind);
-                        return { node: node_4, name: name_4, kind: "keyword" /* keyword */, displayParts: [{ text: name_4, kind: "keyword" /* keyword */ }] };
+                        var node_2 = def.node;
+                        var name_2 = ts.tokenToString(node_2.kind);
+                        return { node: node_2, name: name_2, kind: "keyword" /* keyword */, displayParts: [{ text: name_2, kind: "keyword" /* keyword */ }] };
                     }
                     case "this": {
-                        var node_5 = def.node;
-                        var symbol = checker.getSymbolAtLocation(node_5);
-                        var displayParts_2 = symbol && ts.SymbolDisplay.getSymbolDisplayPartsDocumentationAndSymbolKind(checker, symbol, node_5.getSourceFile(), ts.getContainerNode(node_5), node_5).displayParts || [ts.textPart("this")];
-                        return { node: node_5, name: "this", kind: "var" /* variableElement */, displayParts: displayParts_2 };
+                        var node_3 = def.node;
+                        var symbol = checker.getSymbolAtLocation(node_3);
+                        var displayParts_2 = symbol && ts.SymbolDisplay.getSymbolDisplayPartsDocumentationAndSymbolKind(checker, symbol, node_3.getSourceFile(), ts.getContainerNode(node_3), node_3).displayParts || [ts.textPart("this")];
+                        return { node: node_3, name: "this", kind: "var" /* variableElement */, displayParts: displayParts_2 };
                     }
                     case "string": {
-                        var node_6 = def.node;
-                        return { node: node_6, name: node_6.text, kind: "var" /* variableElement */, displayParts: [ts.displayPart(ts.getTextOfNode(node_6), ts.SymbolDisplayPartKind.stringLiteral)] };
+                        var node_4 = def.node;
+                        return { node: node_4, name: node_4.text, kind: "var" /* variableElement */, displayParts: [ts.displayPart(ts.getTextOfNode(node_4), ts.SymbolDisplayPartKind.stringLiteral)] };
                     }
                     default:
                         return ts.Debug.assertNever(def);
@@ -91329,8 +93405,8 @@ var ts;
                     var sourceId = ts.getNodeId(sourceFile);
                     var seenSymbols = this.sourceFileToSeenSymbols[sourceId] || (this.sourceFileToSeenSymbols[sourceId] = ts.createMap());
                     var anyNewSymbols = false;
-                    for (var _i = 0, symbols_5 = symbols; _i < symbols_5.length; _i++) {
-                        var sym = symbols_5[_i];
+                    for (var _i = 0, symbols_2 = symbols; _i < symbols_2.length; _i++) {
+                        var sym = symbols_2[_i];
                         anyNewSymbols = ts.addToSeen(seenSymbols, ts.getSymbolId(sym)) || anyNewSymbols;
                     }
                     return anyNewSymbols;
@@ -91463,8 +93539,8 @@ var ts;
                     return undefined;
                 }
                 var scope;
-                for (var _i = 0, declarations_10 = declarations; _i < declarations_10.length; _i++) {
-                    var declaration = declarations_10[_i];
+                for (var _i = 0, declarations_1 = declarations; _i < declarations_1.length; _i++) {
+                    var declaration = declarations_1[_i];
                     var container = ts.getContainerNode(declaration);
                     if (scope && scope !== container) {
                         // Different declarations have different containers, bail out
@@ -91511,7 +93587,7 @@ var ts;
             Core.eachSymbolReferenceInFile = eachSymbolReferenceInFile;
             function getPossibleSymbolReferenceNodes(sourceFile, symbolName, container) {
                 if (container === void 0) { container = sourceFile; }
-                return getPossibleSymbolReferencePositions(sourceFile, symbolName, container).map(function (pos) { return ts.getTouchingPropertyName(sourceFile, pos, /*includeJsDocComment*/ true); });
+                return getPossibleSymbolReferencePositions(sourceFile, symbolName, container).map(function (pos) { return ts.getTouchingPropertyName(sourceFile, pos); });
             }
             function getPossibleSymbolReferencePositions(sourceFile, symbolName, container) {
                 if (container === void 0) { container = sourceFile; }
@@ -91601,7 +93677,7 @@ var ts;
                 return !!(ts.getMeaningFromLocation(referenceLocation) & state.searchMeaning);
             }
             function getReferencesAtLocation(sourceFile, position, search, state, addReferencesHere) {
-                var referenceLocation = ts.getTouchingPropertyName(sourceFile, position, /*includeJsDocComment*/ true);
+                var referenceLocation = ts.getTouchingPropertyName(sourceFile, position);
                 if (!isValidReferencePosition(referenceLocation, search.text)) {
                     // This wasn't the start of a token.  Check to see if it might be a
                     // match in a comment or string if that's what the caller is asking
@@ -92160,8 +94236,8 @@ var ts;
                         // To achieve that we will keep iterating until the result stabilizes.
                         // Remember the last meaning
                         lastIterationMeaning = meaning;
-                        for (var _i = 0, declarations_11 = declarations; _i < declarations_11.length; _i++) {
-                            var declaration = declarations_11[_i];
+                        for (var _i = 0, declarations_2 = declarations; _i < declarations_2.length; _i++) {
+                            var declaration = declarations_2[_i];
                             var declarationMeaning = ts.getMeaningFromDeclaration(declaration);
                             if (declarationMeaning & meaning) {
                                 meaning |= declarationMeaning;
@@ -92292,8 +94368,8 @@ var ts;
             // Type annotation needed due to #7294
             var elements = ts.isArrayLiteralExpression(property.initializer) ? property.initializer.elements : [property.initializer];
             var foundExactMatch = false;
-            for (var _i = 0, elements_5 = elements; _i < elements_5.length; _i++) {
-                var element = elements_5[_i];
+            for (var _i = 0, elements_1 = elements; _i < elements_1.length; _i++) {
+                var element = elements_1[_i];
                 foundExactMatch = tryUpdateString(element) || foundExactMatch;
             }
             return foundExactMatch;
@@ -92314,7 +94390,7 @@ var ts;
         }
     }
     function updateImports(program, changeTracker, oldToNew, newToOld, host, getCanonicalFileName, preferences) {
-        var _loop_14 = function (sourceFile) {
+        var _loop_3 = function (sourceFile) {
             var newImportFromPath = oldToNew(sourceFile.fileName) || sourceFile.fileName;
             var newImportFromDirectory = ts.getDirectoryPath(newImportFromPath);
             var oldFromNew = newToOld(sourceFile.fileName);
@@ -92332,12 +94408,12 @@ var ts;
                     // TODO:GH#18217
                     ? getSourceFileToImportFromResolved(ts.resolveModuleName(importLiteral.text, oldImportFromPath, program.getCompilerOptions(), host), oldToNew, program)
                     : getSourceFileToImport(importLiteral, sourceFile, program, host, oldToNew);
-                return toImport === undefined ? undefined : ts.moduleSpecifiers.getModuleSpecifier(program, sourceFile, newImportFromPath, toImport, host, preferences);
+                return toImport === undefined ? undefined : ts.moduleSpecifiers.getModuleSpecifier(program.getCompilerOptions(), sourceFile, newImportFromPath, toImport, host, preferences);
             });
         };
         for (var _i = 0, _a = program.getSourceFiles(); _i < _a.length; _i++) {
             var sourceFile = _a[_i];
-            _loop_14(sourceFile);
+            _loop_3(sourceFile);
         }
     }
     function combineNormal(pathA, pathB) {
@@ -92408,7 +94484,7 @@ var ts;
             if (reference) {
                 return [getDefinitionInfoForFileReference(reference.fileName, reference.file.fileName)];
             }
-            var node = ts.getTouchingPropertyName(sourceFile, position, /*includeJsDocComment*/ true);
+            var node = ts.getTouchingPropertyName(sourceFile, position);
             if (node === sourceFile) {
                 return undefined;
             }
@@ -92430,11 +94506,16 @@ var ts;
                 var sigInfo = createDefinitionFromSignatureDeclaration(typeChecker, calledDeclaration);
                 // For a function, if this is the original function definition, return just sigInfo.
                 // If this is the original constructor definition, parent is the class.
-                return typeChecker.getRootSymbols(symbol).some(function (s) { return calledDeclaration.symbol === s || calledDeclaration.symbol.parent === s; }) ||
+                if (typeChecker.getRootSymbols(symbol).some(function (s) { return calledDeclaration.symbol === s || calledDeclaration.symbol.parent === s; }) ||
                     // TODO: GH#23742 Following check shouldn't be necessary if 'require' is an alias
-                    symbol.declarations.some(function (d) { return ts.isVariableDeclaration(d) && !!d.initializer && ts.isRequireCall(d.initializer, /*checkArgumentIsStringLiteralLike*/ false); })
-                    ? [sigInfo]
-                    : [sigInfo].concat(getDefinitionFromSymbol(typeChecker, symbol, node));
+                    symbol.declarations.some(function (d) { return ts.isVariableDeclaration(d) && !!d.initializer && ts.isRequireCall(d.initializer, /*checkArgumentIsStringLiteralLike*/ false); })) {
+                    return [sigInfo];
+                }
+                else {
+                    var defs = getDefinitionFromSymbol(typeChecker, symbol, node);
+                    // For a 'super()' call, put the signature first, else put the variable first.
+                    return node.kind === 97 /* SuperKeyword */ ? [sigInfo].concat(defs) : defs.concat([sigInfo]);
+                }
             }
             // Because name in short-hand property assignment has two different meanings: property name and property value,
             // using go-to-definition at such position should go to the variable declaration of the property value rather than
@@ -92487,21 +94568,26 @@ var ts;
         function getReferenceAtPosition(sourceFile, position, program) {
             var referencePath = findReferenceInPosition(sourceFile.referencedFiles, position);
             if (referencePath) {
-                var file_16 = ts.tryResolveScriptReference(program, sourceFile, referencePath);
-                return file_16 && { fileName: referencePath.fileName, file: file_16 };
+                var file = ts.tryResolveScriptReference(program, sourceFile, referencePath);
+                return file && { fileName: referencePath.fileName, file: file };
             }
             var typeReferenceDirective = findReferenceInPosition(sourceFile.typeReferenceDirectives, position);
             if (typeReferenceDirective) {
                 var reference = program.getResolvedTypeReferenceDirectives().get(typeReferenceDirective.fileName);
-                var file_17 = reference && program.getSourceFile(reference.resolvedFileName); // TODO:GH#18217
-                return file_17 && { fileName: typeReferenceDirective.fileName, file: file_17 };
+                var file = reference && program.getSourceFile(reference.resolvedFileName); // TODO:GH#18217
+                return file && { fileName: typeReferenceDirective.fileName, file: file };
+            }
+            var libReferenceDirective = findReferenceInPosition(sourceFile.libReferenceDirectives, position);
+            if (libReferenceDirective) {
+                var file = program.getLibFileFromReference(libReferenceDirective);
+                return file && { fileName: libReferenceDirective.fileName, file: file };
             }
             return undefined;
         }
         GoToDefinition.getReferenceAtPosition = getReferenceAtPosition;
         /// Goto type
         function getTypeDefinitionAtPosition(typeChecker, sourceFile, position) {
-            var node = ts.getTouchingPropertyName(sourceFile, position, /*includeJsDocComment*/ true);
+            var node = ts.getTouchingPropertyName(sourceFile, position);
             if (node === sourceFile) {
                 return undefined;
             }
@@ -92522,11 +94608,13 @@ var ts;
                 return undefined;
             }
             // Check if position is on triple slash reference.
-            var comment = findReferenceInPosition(sourceFile.referencedFiles, position) || findReferenceInPosition(sourceFile.typeReferenceDirectives, position);
+            var comment = findReferenceInPosition(sourceFile.referencedFiles, position) ||
+                findReferenceInPosition(sourceFile.typeReferenceDirectives, position) ||
+                findReferenceInPosition(sourceFile.libReferenceDirectives, position);
             if (comment) {
                 return { definitions: definitions, textSpan: ts.createTextSpanFromRange(comment) };
             }
-            var node = ts.getTouchingPropertyName(sourceFile, position, /*includeJsDocComment*/ true);
+            var node = ts.getTouchingPropertyName(sourceFile, position);
             var textSpan = ts.createTextSpan(node.getStart(), node.getWidth());
             return { definitions: definitions, textSpan: textSpan };
         }
@@ -93010,368 +95098,6 @@ var ts;
 })(ts || (ts = {}));
 /* @internal */
 var ts;
-(function (ts) {
-    function stringToInt(str) {
-        var n = parseInt(str, 10);
-        if (isNaN(n)) {
-            throw new Error("Error in parseInt(" + JSON.stringify(str) + ")");
-        }
-        return n;
-    }
-    var isPrereleaseRegex = /^(.*)-next.\d+/;
-    var prereleaseSemverRegex = /^(\d+)\.(\d+)\.0-next.(\d+)$/;
-    var semverRegex = /^(\d+)\.(\d+)\.(\d+)$/;
-    var Semver = /** @class */ (function () {
-        function Semver(major, minor, patch, 
-        /**
-         * If true, this is `major.minor.0-next.patch`.
-         * If false, this is `major.minor.patch`.
-         */
-        isPrerelease) {
-            this.major = major;
-            this.minor = minor;
-            this.patch = patch;
-            this.isPrerelease = isPrerelease;
-        }
-        Semver.parse = function (semver) {
-            var isPrerelease = isPrereleaseRegex.test(semver);
-            var result = Semver.tryParse(semver, isPrerelease);
-            if (!result) {
-                throw new Error("Unexpected semver: " + semver + " (isPrerelease: " + isPrerelease + ")");
-            }
-            return result;
-        };
-        Semver.fromRaw = function (_a) {
-            var major = _a.major, minor = _a.minor, patch = _a.patch, isPrerelease = _a.isPrerelease;
-            return new Semver(major, minor, patch, isPrerelease);
-        };
-        // This must parse the output of `versionString`.
-        Semver.tryParse = function (semver, isPrerelease) {
-            // Per the semver spec <http://semver.org/#spec-item-2>:
-            // "A normal version number MUST take the form X.Y.Z where X, Y, and Z are non-negative integers, and MUST NOT contain leading zeroes."
-            var rgx = isPrerelease ? prereleaseSemverRegex : semverRegex;
-            var match = rgx.exec(semver);
-            return match ? new Semver(stringToInt(match[1]), stringToInt(match[2]), stringToInt(match[3]), isPrerelease) : undefined;
-        };
-        Object.defineProperty(Semver.prototype, "versionString", {
-            get: function () {
-                return this.isPrerelease ? this.major + "." + this.minor + ".0-next." + this.patch : this.major + "." + this.minor + "." + this.patch;
-            },
-            enumerable: true,
-            configurable: true
-        });
-        Semver.prototype.equals = function (sem) {
-            return this.major === sem.major && this.minor === sem.minor && this.patch === sem.patch && this.isPrerelease === sem.isPrerelease;
-        };
-        Semver.prototype.greaterThan = function (sem) {
-            return this.major > sem.major || this.major === sem.major
-                && (this.minor > sem.minor || this.minor === sem.minor
-                    && (!this.isPrerelease && sem.isPrerelease || this.isPrerelease === sem.isPrerelease
-                        && this.patch > sem.patch));
-        };
-        return Semver;
-    }());
-    ts.Semver = Semver;
-})(ts || (ts = {}));
-/* @internal */
-var ts;
-(function (ts) {
-    var JsTyping;
-    (function (JsTyping) {
-        /* @internal */
-        function isTypingUpToDate(cachedTyping, availableTypingVersions) {
-            var availableVersion = ts.Semver.parse(ts.getProperty(availableTypingVersions, "ts" + ts.versionMajorMinor) || ts.getProperty(availableTypingVersions, "latest"));
-            return !availableVersion.greaterThan(cachedTyping.version);
-        }
-        JsTyping.isTypingUpToDate = isTypingUpToDate;
-        /* @internal */
-        JsTyping.nodeCoreModuleList = [
-            "assert",
-            "async_hooks",
-            "buffer",
-            "child_process",
-            "cluster",
-            "console",
-            "constants",
-            "crypto",
-            "dgram",
-            "dns",
-            "domain",
-            "events",
-            "fs",
-            "http",
-            "https",
-            "http2",
-            "inspector",
-            "net",
-            "os",
-            "path",
-            "perf_hooks",
-            "process",
-            "punycode",
-            "querystring",
-            "readline",
-            "repl",
-            "stream",
-            "string_decoder",
-            "timers",
-            "tls",
-            "tty",
-            "url",
-            "util",
-            "v8",
-            "vm",
-            "zlib"
-        ];
-        /* @internal */
-        JsTyping.nodeCoreModules = ts.arrayToSet(JsTyping.nodeCoreModuleList);
-        function loadSafeList(host, safeListPath) {
-            var result = ts.readConfigFile(safeListPath, function (path) { return host.readFile(path); });
-            return ts.createMapFromTemplate(result.config);
-        }
-        JsTyping.loadSafeList = loadSafeList;
-        function loadTypesMap(host, typesMapPath) {
-            var result = ts.readConfigFile(typesMapPath, function (path) { return host.readFile(path); });
-            if (result.config) {
-                return ts.createMapFromTemplate(result.config.simpleMap);
-            }
-            return undefined;
-        }
-        JsTyping.loadTypesMap = loadTypesMap;
-        /**
-         * @param host is the object providing I/O related operations.
-         * @param fileNames are the file names that belong to the same project
-         * @param projectRootPath is the path to the project root directory
-         * @param safeListPath is the path used to retrieve the safe list
-         * @param packageNameToTypingLocation is the map of package names to their cached typing locations and installed versions
-         * @param typeAcquisition is used to customize the typing acquisition process
-         * @param compilerOptions are used as a source for typing inference
-         */
-        function discoverTypings(host, log, fileNames, projectRootPath, safeList, packageNameToTypingLocation, typeAcquisition, unresolvedImports, typesRegistry) {
-            if (!typeAcquisition || !typeAcquisition.enable) {
-                return { cachedTypingPaths: [], newTypingNames: [], filesToWatch: [] };
-            }
-            // A typing name to typing file path mapping
-            var inferredTypings = ts.createMap();
-            // Only infer typings for .js and .jsx files
-            fileNames = ts.mapDefined(fileNames, function (fileName) {
-                var path = ts.normalizePath(fileName);
-                if (ts.hasJavaScriptFileExtension(path)) {
-                    return path;
-                }
-            });
-            var filesToWatch = [];
-            if (typeAcquisition.include)
-                addInferredTypings(typeAcquisition.include, "Explicitly included types");
-            var exclude = typeAcquisition.exclude || [];
-            // Directories to search for package.json, bower.json and other typing information
-            var possibleSearchDirs = ts.arrayToSet(fileNames, ts.getDirectoryPath);
-            possibleSearchDirs.set(projectRootPath, true);
-            possibleSearchDirs.forEach(function (_true, searchDir) {
-                var packageJsonPath = ts.combinePaths(searchDir, "package.json");
-                getTypingNamesFromJson(packageJsonPath, filesToWatch);
-                var bowerJsonPath = ts.combinePaths(searchDir, "bower.json");
-                getTypingNamesFromJson(bowerJsonPath, filesToWatch);
-                var bowerComponentsPath = ts.combinePaths(searchDir, "bower_components");
-                getTypingNamesFromPackagesFolder(bowerComponentsPath, filesToWatch);
-                var nodeModulesPath = ts.combinePaths(searchDir, "node_modules");
-                getTypingNamesFromPackagesFolder(nodeModulesPath, filesToWatch);
-            });
-            getTypingNamesFromSourceFileNames(fileNames);
-            // add typings for unresolved imports
-            if (unresolvedImports) {
-                var module_1 = ts.deduplicate(unresolvedImports.map(function (moduleId) { return JsTyping.nodeCoreModules.has(moduleId) ? "node" : moduleId; }), ts.equateStringsCaseSensitive, ts.compareStringsCaseSensitive);
-                addInferredTypings(module_1, "Inferred typings from unresolved imports");
-            }
-            // Add the cached typing locations for inferred typings that are already installed
-            packageNameToTypingLocation.forEach(function (typing, name) {
-                var registryEntry = typesRegistry.get(name);
-                if (inferredTypings.has(name) && inferredTypings.get(name) === undefined && registryEntry !== undefined && isTypingUpToDate(typing, registryEntry)) {
-                    inferredTypings.set(name, typing.typingLocation);
-                }
-            });
-            // Remove typings that the user has added to the exclude list
-            for (var _i = 0, exclude_1 = exclude; _i < exclude_1.length; _i++) {
-                var excludeTypingName = exclude_1[_i];
-                var didDelete = inferredTypings.delete(excludeTypingName);
-                if (didDelete && log)
-                    log("Typing for " + excludeTypingName + " is in exclude list, will be ignored.");
-            }
-            var newTypingNames = [];
-            var cachedTypingPaths = [];
-            inferredTypings.forEach(function (inferred, typing) {
-                if (inferred !== undefined) {
-                    cachedTypingPaths.push(inferred);
-                }
-                else {
-                    newTypingNames.push(typing);
-                }
-            });
-            var result = { cachedTypingPaths: cachedTypingPaths, newTypingNames: newTypingNames, filesToWatch: filesToWatch };
-            if (log)
-                log("Result: " + JSON.stringify(result));
-            return result;
-            function addInferredTyping(typingName) {
-                if (!inferredTypings.has(typingName)) {
-                    inferredTypings.set(typingName, undefined); // TODO: GH#18217
-                }
-            }
-            function addInferredTypings(typingNames, message) {
-                if (log)
-                    log(message + ": " + JSON.stringify(typingNames));
-                ts.forEach(typingNames, addInferredTyping);
-            }
-            /**
-             * Get the typing info from common package manager json files like package.json or bower.json
-             */
-            function getTypingNamesFromJson(jsonPath, filesToWatch) {
-                if (!host.fileExists(jsonPath)) {
-                    return;
-                }
-                filesToWatch.push(jsonPath);
-                var jsonConfig = ts.readConfigFile(jsonPath, function (path) { return host.readFile(path); }).config;
-                var jsonTypingNames = ts.flatMap([jsonConfig.dependencies, jsonConfig.devDependencies, jsonConfig.optionalDependencies, jsonConfig.peerDependencies], ts.getOwnKeys);
-                addInferredTypings(jsonTypingNames, "Typing names in '" + jsonPath + "' dependencies");
-            }
-            /**
-             * Infer typing names from given file names. For example, the file name "jquery-min.2.3.4.js"
-             * should be inferred to the 'jquery' typing name; and "angular-route.1.2.3.js" should be inferred
-             * to the 'angular-route' typing name.
-             * @param fileNames are the names for source files in the project
-             */
-            function getTypingNamesFromSourceFileNames(fileNames) {
-                var fromFileNames = ts.mapDefined(fileNames, function (j) {
-                    if (!ts.hasJavaScriptFileExtension(j))
-                        return undefined;
-                    var inferredTypingName = ts.removeFileExtension(ts.getBaseFileName(j.toLowerCase()));
-                    var cleanedTypingName = ts.removeMinAndVersionNumbers(inferredTypingName);
-                    return safeList.get(cleanedTypingName);
-                });
-                if (fromFileNames.length) {
-                    addInferredTypings(fromFileNames, "Inferred typings from file names");
-                }
-                var hasJsxFile = ts.some(fileNames, function (f) { return ts.fileExtensionIs(f, ".jsx" /* Jsx */); });
-                if (hasJsxFile) {
-                    if (log)
-                        log("Inferred 'react' typings due to presence of '.jsx' extension");
-                    addInferredTyping("react");
-                }
-            }
-            /**
-             * Infer typing names from packages folder (ex: node_module, bower_components)
-             * @param packagesFolderPath is the path to the packages folder
-             */
-            function getTypingNamesFromPackagesFolder(packagesFolderPath, filesToWatch) {
-                filesToWatch.push(packagesFolderPath);
-                // Todo: add support for ModuleResolutionHost too
-                if (!host.directoryExists(packagesFolderPath)) {
-                    return;
-                }
-                // depth of 2, so we access `node_modules/foo` but not `node_modules/foo/bar`
-                var fileNames = host.readDirectory(packagesFolderPath, [".json" /* Json */], /*excludes*/ undefined, /*includes*/ undefined, /*depth*/ 2);
-                if (log)
-                    log("Searching for typing names in " + packagesFolderPath + "; all files: " + JSON.stringify(fileNames));
-                var packageNames = [];
-                for (var _i = 0, fileNames_1 = fileNames; _i < fileNames_1.length; _i++) {
-                    var fileName = fileNames_1[_i];
-                    var normalizedFileName = ts.normalizePath(fileName);
-                    var baseFileName = ts.getBaseFileName(normalizedFileName);
-                    if (baseFileName !== "package.json" && baseFileName !== "bower.json") {
-                        continue;
-                    }
-                    var result_6 = ts.readConfigFile(normalizedFileName, function (path) { return host.readFile(path); });
-                    var packageJson = result_6.config;
-                    // npm 3's package.json contains a "_requiredBy" field
-                    // we should include all the top level module names for npm 2, and only module names whose
-                    // "_requiredBy" field starts with "#" or equals "/" for npm 3.
-                    if (baseFileName === "package.json" && packageJson._requiredBy &&
-                        ts.filter(packageJson._requiredBy, function (r) { return r[0] === "#" || r === "/"; }).length === 0) {
-                        continue;
-                    }
-                    // If the package has its own d.ts typings, those will take precedence. Otherwise the package name will be used
-                    // to download d.ts files from DefinitelyTyped
-                    if (!packageJson.name) {
-                        continue;
-                    }
-                    var ownTypes = packageJson.types || packageJson.typings;
-                    if (ownTypes) {
-                        var absolutePath = ts.getNormalizedAbsolutePath(ownTypes, ts.getDirectoryPath(normalizedFileName));
-                        if (log)
-                            log("    Package '" + packageJson.name + "' provides its own types.");
-                        inferredTypings.set(packageJson.name, absolutePath);
-                    }
-                    else {
-                        packageNames.push(packageJson.name);
-                    }
-                }
-                addInferredTypings(packageNames, "    Found package names");
-            }
-        }
-        JsTyping.discoverTypings = discoverTypings;
-        var PackageNameValidationResult;
-        (function (PackageNameValidationResult) {
-            PackageNameValidationResult[PackageNameValidationResult["Ok"] = 0] = "Ok";
-            PackageNameValidationResult[PackageNameValidationResult["ScopedPackagesNotSupported"] = 1] = "ScopedPackagesNotSupported";
-            PackageNameValidationResult[PackageNameValidationResult["EmptyName"] = 2] = "EmptyName";
-            PackageNameValidationResult[PackageNameValidationResult["NameTooLong"] = 3] = "NameTooLong";
-            PackageNameValidationResult[PackageNameValidationResult["NameStartsWithDot"] = 4] = "NameStartsWithDot";
-            PackageNameValidationResult[PackageNameValidationResult["NameStartsWithUnderscore"] = 5] = "NameStartsWithUnderscore";
-            PackageNameValidationResult[PackageNameValidationResult["NameContainsNonURISafeCharacters"] = 6] = "NameContainsNonURISafeCharacters";
-        })(PackageNameValidationResult = JsTyping.PackageNameValidationResult || (JsTyping.PackageNameValidationResult = {}));
-        var maxPackageNameLength = 214;
-        /**
-         * Validates package name using rules defined at https://docs.npmjs.com/files/package.json
-         */
-        function validatePackageName(packageName) {
-            if (!packageName) {
-                return 2 /* EmptyName */;
-            }
-            if (packageName.length > maxPackageNameLength) {
-                return 3 /* NameTooLong */;
-            }
-            if (packageName.charCodeAt(0) === 46 /* dot */) {
-                return 4 /* NameStartsWithDot */;
-            }
-            if (packageName.charCodeAt(0) === 95 /* _ */) {
-                return 5 /* NameStartsWithUnderscore */;
-            }
-            // check if name is scope package like: starts with @ and has one '/' in the middle
-            // scoped packages are not currently supported
-            // TODO: when support will be added we'll need to split and check both scope and package name
-            if (/^@[^/]+\/[^/]+$/.test(packageName)) {
-                return 1 /* ScopedPackagesNotSupported */;
-            }
-            if (encodeURIComponent(packageName) !== packageName) {
-                return 6 /* NameContainsNonURISafeCharacters */;
-            }
-            return 0 /* Ok */;
-        }
-        JsTyping.validatePackageName = validatePackageName;
-        function renderPackageNameValidationFailure(result, typing) {
-            switch (result) {
-                case 2 /* EmptyName */:
-                    return "Package name '" + typing + "' cannot be empty";
-                case 3 /* NameTooLong */:
-                    return "Package name '" + typing + "' should be less than " + maxPackageNameLength + " characters";
-                case 4 /* NameStartsWithDot */:
-                    return "Package name '" + typing + "' cannot start with '.'";
-                case 5 /* NameStartsWithUnderscore */:
-                    return "Package name '" + typing + "' cannot start with '_'";
-                case 1 /* ScopedPackagesNotSupported */:
-                    return "Package '" + typing + "' is scoped and currently is not supported";
-                case 6 /* NameContainsNonURISafeCharacters */:
-                    return "Package name '" + typing + "' contains non URI safe characters";
-                case 0 /* Ok */:
-                    return ts.Debug.fail(); // Shouldn't have called this.
-                default:
-                    throw ts.Debug.assertNever(result);
-            }
-        }
-        JsTyping.renderPackageNameValidationFailure = renderPackageNameValidationFailure;
-    })(JsTyping = ts.JsTyping || (ts.JsTyping = {}));
-})(ts || (ts = {}));
-/* @internal */
-var ts;
 (function (ts) {
     var NavigateTo;
     (function (NavigateTo) {
@@ -93380,7 +95106,7 @@ var ts;
             if (!patternMatcher)
                 return ts.emptyArray;
             var rawItems = [];
-            var _loop_15 = function (sourceFile) {
+            var _loop_4 = function (sourceFile) {
                 cancellationToken.throwIfCancellationRequested();
                 if (excludeDtsFiles && ts.fileExtensionIs(sourceFile.fileName, ".d.ts" /* Dts */)) {
                     return "continue";
@@ -93390,9 +95116,9 @@ var ts;
                 });
             };
             // Search the declarations in all files and output matched NavigateToItem into array of NavigateToItem[]
-            for (var _i = 0, sourceFiles_7 = sourceFiles; _i < sourceFiles_7.length; _i++) {
-                var sourceFile = sourceFiles_7[_i];
-                _loop_15(sourceFile);
+            for (var _i = 0, sourceFiles_3 = sourceFiles; _i < sourceFiles_3.length; _i++) {
+                var sourceFile = sourceFiles_3[_i];
+                _loop_4(sourceFile);
             }
             rawItems.sort(compareNavigateToItems);
             if (maxResultCount !== undefined) {
@@ -93408,8 +95134,8 @@ var ts;
             if (!match) {
                 return; // continue to next named declarations
             }
-            for (var _i = 0, declarations_12 = declarations; _i < declarations_12.length; _i++) {
-                var declaration = declarations_12[_i];
+            for (var _i = 0, declarations_3 = declarations; _i < declarations_3.length; _i++) {
+                var declaration = declarations_3[_i];
                 if (!shouldKeepItem(declaration, checker))
                     continue;
                 if (patternMatcher.patternContainsDots) {
@@ -93587,7 +95313,7 @@ var ts;
         }
         function rootNavigationBarNode(sourceFile) {
             ts.Debug.assert(!parentsStack.length);
-            var root = { node: sourceFile, additionalNodes: undefined, parent: undefined, children: undefined, indent: 0 };
+            var root = { node: sourceFile, name: undefined, additionalNodes: undefined, parent: undefined, children: undefined, indent: 0 };
             parent = root;
             for (var _i = 0, _a = sourceFile.statements; _i < _a.length; _i++) {
                 var statement = _a[_i];
@@ -93603,6 +95329,7 @@ var ts;
         function emptyNavigationBarNode(node) {
             return {
                 node: node,
+                name: ts.isDeclaration(node) || ts.isExpression(node) ? ts.getNameOfDeclaration(node) : undefined,
                 additionalNodes: undefined,
                 parent: parent,
                 children: undefined,
@@ -93887,11 +95614,10 @@ var ts;
                     return undefined;
             }
         }
-        function getItemName(node) {
+        function getItemName(node, name) {
             if (node.kind === 239 /* ModuleDeclaration */) {
                 return getModuleName(node);
             }
-            var name = ts.getNameOfDeclaration(node);
             if (name) {
                 var text = nodeText(name);
                 if (text.length > 0) {
@@ -93993,16 +95719,17 @@ var ts;
         }
         function convertToTree(n) {
             return {
-                text: getItemName(n.node),
+                text: getItemName(n.node, n.name),
                 kind: ts.getNodeKind(n.node),
                 kindModifiers: getModifiers(n.node),
                 spans: getSpans(n),
+                nameSpan: n.name && getNodeSpan(n.name),
                 childItems: ts.map(n.children, convertToTree)
             };
         }
         function convertToTopLevelItem(n) {
             return {
-                text: getItemName(n.node),
+                text: getItemName(n.node, n.name),
                 kind: ts.getNodeKind(n.node),
                 kindModifiers: getModifiers(n.node),
                 spans: getSpans(n),
@@ -94013,7 +95740,7 @@ var ts;
             };
             function convertToChildItem(n) {
                 return {
-                    text: getItemName(n.node),
+                    text: getItemName(n.node, n.name),
                     kind: ts.getNodeKind(n.node),
                     kindModifiers: ts.getNodeModifiers(n.node),
                     spans: getSpans(n),
@@ -94488,8 +96215,8 @@ var ts;
             var firstSingleLineCommentStart = -1;
             var lastSingleLineCommentEnd = -1;
             var singleLineCommentCount = 0;
-            for (var _i = 0, comments_3 = comments; _i < comments_3.length; _i++) {
-                var _a = comments_3[_i], kind = _a.kind, pos = _a.pos, end = _a.end;
+            for (var _i = 0, comments_1 = comments; _i < comments_1.length; _i++) {
+                var _a = comments_1[_i], kind = _a.kind, pos = _a.pos, end = _a.end;
                 cancellationToken.throwIfCancellationRequested();
                 switch (kind) {
                     case 2 /* SingleLineCommentTrivia */:
@@ -94875,15 +96602,15 @@ var ts;
     // Assumes 'value' is already lowercase.
     function indexOfIgnoringCase(str, value) {
         var n = str.length - value.length;
-        var _loop_16 = function (start) {
+        var _loop_5 = function (start) {
             if (every(value, function (valueChar, i) { return toLowerCase(str.charCodeAt(i + start)) === valueChar; })) {
                 return { value: start };
             }
         };
         for (var start = 0; start <= n; start++) {
-            var state_4 = _loop_16(start);
-            if (typeof state_4 === "object")
-                return state_4.value;
+            var state_1 = _loop_5(start);
+            if (typeof state_1 === "object")
+                return state_1.value;
         }
         return -1;
     }
@@ -95067,6 +96794,7 @@ var ts;
             checkJsDirective: undefined,
             referencedFiles: [],
             typeReferenceDirectives: [],
+            libReferenceDirectives: [],
             amdDependencies: [],
             hasNoDefaultLib: undefined,
             moduleName: undefined
@@ -95367,7 +97095,7 @@ var ts;
                     importedFiles.push(decl.ref);
                 }
             }
-            return { referencedFiles: pragmaContext.referencedFiles, typeReferenceDirectives: pragmaContext.typeReferenceDirectives, importedFiles: importedFiles, isLibFile: !!pragmaContext.hasNoDefaultLib, ambientExternalModules: undefined };
+            return { referencedFiles: pragmaContext.referencedFiles, typeReferenceDirectives: pragmaContext.typeReferenceDirectives, libReferenceDirectives: pragmaContext.libReferenceDirectives, importedFiles: importedFiles, isLibFile: !!pragmaContext.hasNoDefaultLib, ambientExternalModules: undefined };
         }
         else {
             // for global scripts ambient modules still can have augmentations - look for ambient modules with depth > 0
@@ -95386,7 +97114,7 @@ var ts;
                     }
                 }
             }
-            return { referencedFiles: pragmaContext.referencedFiles, typeReferenceDirectives: pragmaContext.typeReferenceDirectives, importedFiles: importedFiles, isLibFile: !!pragmaContext.hasNoDefaultLib, ambientExternalModules: ambientModuleNames };
+            return { referencedFiles: pragmaContext.referencedFiles, typeReferenceDirectives: pragmaContext.typeReferenceDirectives, libReferenceDirectives: pragmaContext.libReferenceDirectives, importedFiles: importedFiles, isLibFile: !!pragmaContext.hasNoDefaultLib, ambientExternalModules: ambientModuleNames };
         }
     }
     ts.preProcessFile = preProcessFile;
@@ -95398,7 +97126,7 @@ var ts;
     (function (Rename) {
         function getRenameInfo(typeChecker, defaultLibFileName, getCanonicalFileName, sourceFile, position) {
             var getCanonicalDefaultLibName = ts.memoize(function () { return getCanonicalFileName(ts.normalizePath(defaultLibFileName)); });
-            var node = ts.getTouchingPropertyName(sourceFile, position, /*includeJsDocComment*/ true);
+            var node = ts.getTouchingPropertyName(sourceFile, position);
             var renameInfo = node && nodeIsEligibleForRename(node)
                 ? getRenameInfoForNode(node, typeChecker, sourceFile, isDefinedInLibraryFile)
                 : undefined;
@@ -95552,11 +97280,11 @@ var ts;
                 return undefined;
             }
             var typeChecker = program.getTypeChecker();
-            var _loop_17 = function (sourceFile) {
+            var _loop_6 = function (sourceFile) {
                 var nameToDeclarations = sourceFile.getNamedDeclarations();
                 var declarations = nameToDeclarations.get(name.text);
                 if (declarations) {
-                    var _loop_18 = function (declaration) {
+                    var _loop_7 = function (declaration) {
                         var symbol = declaration.symbol;
                         if (symbol) {
                             var type = typeChecker.getTypeOfSymbolAtLocation(symbol, declaration);
@@ -95568,19 +97296,19 @@ var ts;
                             }
                         }
                     };
-                    for (var _i = 0, declarations_13 = declarations; _i < declarations_13.length; _i++) {
-                        var declaration = declarations_13[_i];
-                        var state_6 = _loop_18(declaration);
-                        if (typeof state_6 === "object")
-                            return state_6;
+                    for (var _i = 0, declarations_4 = declarations; _i < declarations_4.length; _i++) {
+                        var declaration = declarations_4[_i];
+                        var state_3 = _loop_7(declaration);
+                        if (typeof state_3 === "object")
+                            return state_3;
                     }
                 }
             };
             for (var _i = 0, _a = program.getSourceFiles(); _i < _a.length; _i++) {
                 var sourceFile = _a[_i];
-                var state_5 = _loop_17(sourceFile);
-                if (typeof state_5 === "object")
-                    return state_5.value;
+                var state_2 = _loop_6(sourceFile);
+                if (typeof state_2 === "object")
+                    return state_2.value;
             }
         }
         function getArgumentInfoForCompletions(node, position, sourceFile) {
@@ -95808,7 +97536,7 @@ var ts;
             return ts.createTextSpan(applicableSpanStart, applicableSpanEnd - applicableSpanStart);
         }
         function getContainingArgumentInfo(node, position, sourceFile) {
-            var _loop_19 = function (n) {
+            var _loop_8 = function (n) {
                 // If the node is not a subspan of its parent, this is a big problem.
                 // There have been crashes that might be caused by this violation.
                 ts.Debug.assert(ts.rangeContainsRange(n.parent, n), "Not a subspan", function () { return "Child: " + ts.Debug.showSyntaxKind(n) + ", parent: " + ts.Debug.showSyntaxKind(n.parent); });
@@ -95818,9 +97546,9 @@ var ts;
                 }
             };
             for (var n = node; !ts.isBlock(n) && !ts.isSourceFile(n); n = n.parent) {
-                var state_7 = _loop_19(n);
-                if (typeof state_7 === "object")
-                    return state_7.value;
+                var state_4 = _loop_8(n);
+                if (typeof state_4 === "object")
+                    return state_4.value;
             }
             return undefined;
         }
@@ -95950,8 +97678,8 @@ var ts;
                 var name = importNameForConvertToDefaultImport(importNode);
                 if (!name)
                     continue;
-                var module_2 = ts.getResolvedModule(sourceFile, moduleSpecifier.text);
-                var resolvedFile = module_2 && program.getSourceFile(module_2.resolvedFileName);
+                var module = ts.getResolvedModule(sourceFile, moduleSpecifier.text);
+                var resolvedFile = module && program.getSourceFile(module.resolvedFileName);
                 if (resolvedFile && resolvedFile.externalModuleIndicator && ts.isExportAssignment(resolvedFile.externalModuleIndicator) && resolvedFile.externalModuleIndicator.isExportEquals) {
                     diags.push(ts.createDiagnosticForNode(name, ts.Diagnostics.Import_may_be_converted_to_a_default_import));
                 }
@@ -95966,8 +97694,8 @@ var ts;
                     case 192 /* FunctionExpression */:
                         var decl = ts.getDeclarationOfJSInitializer(node);
                         if (decl) {
-                            var symbol_3 = decl.symbol;
-                            if (symbol_3 && (symbol_3.exports && symbol_3.exports.size || symbol_3.members && symbol_3.members.size)) {
+                            var symbol_2 = decl.symbol;
+                            if (symbol_2 && (symbol_2.exports && symbol_2.exports.size || symbol_2.members && symbol_2.members.size)) {
                                 diags.push(ts.createDiagnosticForNode(ts.isVariableDeclaration(node.parent) ? node.parent.name : node, ts.Diagnostics.This_constructor_function_may_be_converted_to_a_class_declaration));
                                 break;
                             }
@@ -96755,7 +98483,7 @@ var ts;
             return typeof o.type === "object" && !ts.forEachEntry(o.type, function (v) { return typeof v !== "number"; });
         });
         options = ts.cloneCompilerOptions(options);
-        var _loop_20 = function (opt) {
+        var _loop_9 = function (opt) {
             if (!ts.hasProperty(options, opt.name)) {
                 return "continue";
             }
@@ -96774,7 +98502,7 @@ var ts;
         };
         for (var _i = 0, commandLineOptionsStringToEnum_1 = commandLineOptionsStringToEnum; _i < commandLineOptionsStringToEnum_1.length; _i++) {
             var opt = commandLineOptionsStringToEnum_1[_i];
-            _loop_20(opt);
+            _loop_9(opt);
         }
         return options;
     }
@@ -97764,18 +99492,18 @@ var ts;
             // This array is used only during construction of the rulesbucket in the map
             var rulesBucketConstructionStateList = new Array(map.length);
             for (var _i = 0, rules_1 = rules; _i < rules_1.length; _i++) {
-                var rule_1 = rules_1[_i];
-                var specificRule = rule_1.leftTokenRange.isSpecific && rule_1.rightTokenRange.isSpecific;
-                for (var _a = 0, _b = rule_1.leftTokenRange.tokens; _a < _b.length; _a++) {
+                var rule = rules_1[_i];
+                var specificRule = rule.leftTokenRange.isSpecific && rule.rightTokenRange.isSpecific;
+                for (var _a = 0, _b = rule.leftTokenRange.tokens; _a < _b.length; _a++) {
                     var left = _b[_a];
-                    for (var _c = 0, _d = rule_1.rightTokenRange.tokens; _c < _d.length; _c++) {
+                    for (var _c = 0, _d = rule.rightTokenRange.tokens; _c < _d.length; _c++) {
                         var right = _d[_c];
                         var index = getRuleBucketIndex(left, right);
                         var rulesBucket = map[index];
                         if (rulesBucket === undefined) {
                             rulesBucket = map[index] = [];
                         }
-                        addRule(rulesBucket, rule_1.rule, specificRule, rulesBucketConstructionStateList, index);
+                        addRule(rulesBucket, rule.rule, specificRule, rulesBucketConstructionStateList, index);
                     }
                 }
             }
@@ -98385,8 +100113,8 @@ var ts;
                             else if (tokenInfo.token.kind === listStartToken) {
                                 // consume list start token
                                 startLine = sourceFile.getLineAndCharacterOfPosition(tokenInfo.token.pos).line;
-                                var indentation_2 = computeIndentation(tokenInfo.token, startLine, -1 /* Unknown */, parent, parentDynamicIndentation, parentStartLine);
-                                listDynamicIndentation = getDynamicIndentation(parent, parentStartLine, indentation_2.indentation, indentation_2.delta);
+                                var indentation_1 = computeIndentation(tokenInfo.token, startLine, -1 /* Unknown */, parent, parentDynamicIndentation, parentStartLine);
+                                listDynamicIndentation = getDynamicIndentation(parent, parentStartLine, indentation_1.indentation, indentation_1.delta);
                                 consumeTokenAndAdvanceScanner(tokenInfo, parent, listDynamicIndentation, parent);
                             }
                             else {
@@ -99985,14 +101713,14 @@ var ts;
                     // order changes by start position
                     // If the start position is the same, put the shorter range first, since an empty range (x, x) may precede (x, y) but not vice-versa.
                     var normalized = ts.stableSort(changesInFile, function (a, b) { return (a.range.pos - b.range.pos) || (a.range.end - b.range.end); });
-                    var _loop_21 = function (i) {
+                    var _loop_10 = function (i) {
                         ts.Debug.assert(normalized[i].range.end <= normalized[i + 1].range.pos, "Changes overlap", function () {
                             return JSON.stringify(normalized[i].range) + " and " + JSON.stringify(normalized[i + 1].range);
                         });
                     };
                     // verify that change intervals do not overlap, except possibly at end points.
                     for (var i = 0; i < normalized.length - 1; i++) {
-                        _loop_21(i);
+                        _loop_10(i);
                     }
                     var textChanges = normalized.map(function (c) {
                         return ts.createTextChange(ts.createTextSpanFromRange(c.range), computeNewText(c, sourceFile, newLineCharacter, formatContext, validate));
@@ -100004,7 +101732,7 @@ var ts;
             function newFileChanges(oldFile, fileName, statements, newLineCharacter, formatContext) {
                 // TODO: this emits the file, parses it back, then formats it that -- may be a less roundabout way to do this
                 var nonFormattedText = statements.map(function (s) { return getNonformattedText(s, oldFile, newLineCharacter).text; }).join(newLineCharacter);
-                var sourceFile = ts.createSourceFile(fileName, nonFormattedText, 6 /* ESNext */);
+                var sourceFile = ts.createSourceFile(fileName, nonFormattedText, 6 /* ESNext */, /*setParentNodes*/ true);
                 var changes = ts.formatting.formatDocument(sourceFile, formatContext);
                 var text = applyChanges(nonFormattedText, changes);
                 return { fileName: fileName, textChanges: [ts.createTextChange(ts.createTextSpan(0, 0), text)], isNewFile: true };
@@ -100761,11 +102489,11 @@ var ts;
             getCodeActions: function (context) {
                 var sourceFile = context.sourceFile, program = context.program, preferences = context.preferences;
                 var changes = ts.textChanges.ChangeTracker.with(context, function (changes) {
-                    var moduleExportsChangedToDefault = convertFileToEs6Module(sourceFile, program.getTypeChecker(), changes, program.getCompilerOptions().target, preferences);
+                    var moduleExportsChangedToDefault = convertFileToEs6Module(sourceFile, program.getTypeChecker(), changes, program.getCompilerOptions().target, ts.getQuotePreference(sourceFile, preferences));
                     if (moduleExportsChangedToDefault) {
                         for (var _i = 0, _a = program.getSourceFiles(); _i < _a.length; _i++) {
                             var importingFile = _a[_i];
-                            fixImportOfModuleExports(importingFile, sourceFile, changes, preferences);
+                            fixImportOfModuleExports(importingFile, sourceFile, changes, ts.getQuotePreference(importingFile, preferences));
                         }
                     }
                 });
@@ -100773,7 +102501,7 @@ var ts;
                 return [codefix.createCodeFixActionNoFixId("convertToEs6Module", changes, ts.Diagnostics.Convert_to_ES6_module)];
             },
         });
-        function fixImportOfModuleExports(importingFile, exportingFile, changes, preferences) {
+        function fixImportOfModuleExports(importingFile, exportingFile, changes, quotePreference) {
             for (var _i = 0, _a = importingFile.imports; _i < _a.length; _i++) {
                 var moduleSpecifier = _a[_i];
                 var imported = ts.getResolvedModule(importingFile, moduleSpecifier.text);
@@ -100783,7 +102511,7 @@ var ts;
                 var importNode = ts.importFromModuleSpecifier(moduleSpecifier);
                 switch (importNode.kind) {
                     case 243 /* ImportEqualsDeclaration */:
-                        changes.replaceNode(importingFile, importNode, ts.makeImport(importNode.name, /*namedImports*/ undefined, moduleSpecifier, preferences));
+                        changes.replaceNode(importingFile, importNode, ts.makeImport(importNode.name, /*namedImports*/ undefined, moduleSpecifier, quotePreference));
                         break;
                     case 187 /* CallExpression */:
                         if (ts.isRequireCall(importNode, /*checkArgumentIsStringLiteralLike*/ false)) {
@@ -100794,14 +102522,14 @@ var ts;
             }
         }
         /** @returns Whether we converted a `module.exports =` to a default export. */
-        function convertFileToEs6Module(sourceFile, checker, changes, target, preferences) {
+        function convertFileToEs6Module(sourceFile, checker, changes, target, quotePreference) {
             var identifiers = { original: collectFreeIdentifiers(sourceFile), additional: ts.createMap() };
             var exports = collectExportRenames(sourceFile, checker, identifiers);
             convertExportsAccesses(sourceFile, exports, changes);
             var moduleExportsChangedToDefault = false;
             for (var _i = 0, _a = sourceFile.statements; _i < _a.length; _i++) {
                 var statement = _a[_i];
-                var moduleExportsChanged = convertStatement(sourceFile, statement, checker, changes, identifiers, target, exports, preferences);
+                var moduleExportsChanged = convertStatement(sourceFile, statement, checker, changes, identifiers, target, exports, quotePreference);
                 moduleExportsChangedToDefault = moduleExportsChangedToDefault || moduleExportsChanged;
             }
             return moduleExportsChangedToDefault;
@@ -100836,10 +102564,10 @@ var ts;
                 node.forEachChild(recur);
             });
         }
-        function convertStatement(sourceFile, statement, checker, changes, identifiers, target, exports, preferences) {
+        function convertStatement(sourceFile, statement, checker, changes, identifiers, target, exports, quotePreference) {
             switch (statement.kind) {
                 case 214 /* VariableStatement */:
-                    convertVariableStatement(sourceFile, statement, changes, checker, identifiers, target, preferences);
+                    convertVariableStatement(sourceFile, statement, changes, checker, identifiers, target, quotePreference);
                     return false;
                 case 216 /* ExpressionStatement */: {
                     var expression = statement.expression;
@@ -100847,7 +102575,7 @@ var ts;
                         case 187 /* CallExpression */: {
                             if (ts.isRequireCall(expression, /*checkArgumentIsStringLiteralLike*/ true)) {
                                 // For side-effecting require() call, just make a side-effecting import.
-                                changes.replaceNode(sourceFile, statement, ts.makeImport(/*name*/ undefined, /*namedImports*/ undefined, expression.arguments[0], preferences));
+                                changes.replaceNode(sourceFile, statement, ts.makeImport(/*name*/ undefined, /*namedImports*/ undefined, expression.arguments[0], quotePreference));
                             }
                             return false;
                         }
@@ -100862,7 +102590,7 @@ var ts;
                     return false;
             }
         }
-        function convertVariableStatement(sourceFile, statement, changes, checker, identifiers, target, preferences) {
+        function convertVariableStatement(sourceFile, statement, changes, checker, identifiers, target, quotePreference) {
             var declarationList = statement.declarationList;
             var foundImport = false;
             var newNodes = ts.flatMap(declarationList.declarations, function (decl) {
@@ -100875,11 +102603,11 @@ var ts;
                     }
                     else if (ts.isRequireCall(initializer, /*checkArgumentIsStringLiteralLike*/ true)) {
                         foundImport = true;
-                        return convertSingleImport(sourceFile, name, initializer.arguments[0], changes, checker, identifiers, target, preferences);
+                        return convertSingleImport(sourceFile, name, initializer.arguments[0], changes, checker, identifiers, target, quotePreference);
                     }
                     else if (ts.isPropertyAccessExpression(initializer) && ts.isRequireCall(initializer.expression, /*checkArgumentIsStringLiteralLike*/ true)) {
                         foundImport = true;
-                        return convertPropertyAccessImport(name, initializer.name.text, initializer.expression.arguments[0], identifiers, preferences);
+                        return convertPropertyAccessImport(name, initializer.name.text, initializer.expression.arguments[0], identifiers, quotePreference);
                     }
                 }
                 // Move it out to its own variable statement. (This will not be used if `!foundImport`)
@@ -100891,20 +102619,20 @@ var ts;
             }
         }
         /** Converts `const name = require("moduleSpecifier").propertyName` */
-        function convertPropertyAccessImport(name, propertyName, moduleSpecifier, identifiers, preferences) {
+        function convertPropertyAccessImport(name, propertyName, moduleSpecifier, identifiers, quotePreference) {
             switch (name.kind) {
                 case 180 /* ObjectBindingPattern */:
                 case 181 /* ArrayBindingPattern */: {
                     // `const [a, b] = require("c").d` --> `import { d } from "c"; const [a, b] = d;`
                     var tmp = makeUniqueName(propertyName, identifiers);
                     return [
-                        makeSingleImport(tmp, propertyName, moduleSpecifier, preferences),
+                        makeSingleImport(tmp, propertyName, moduleSpecifier, quotePreference),
                         makeConst(/*modifiers*/ undefined, name, ts.createIdentifier(tmp)),
                     ];
                 }
                 case 71 /* Identifier */:
                     // `const a = require("b").c` --> `import { c as a } from "./b";
-                    return [makeSingleImport(name.text, propertyName, moduleSpecifier, preferences)];
+                    return [makeSingleImport(name.text, propertyName, moduleSpecifier, quotePreference)];
                 default:
                     return ts.Debug.assertNever(name);
             }
@@ -101046,7 +102774,7 @@ var ts;
          * Returns nodes that will replace the variable declaration for the commonjs import.
          * May also make use `changes` to remove qualifiers at the use sites of imports, to change `mod.x` to `x`.
          */
-        function convertSingleImport(file, name, moduleSpecifier, changes, checker, identifiers, target, preferences) {
+        function convertSingleImport(file, name, moduleSpecifier, changes, checker, identifiers, target, quotePreference) {
             switch (name.kind) {
                 case 180 /* ObjectBindingPattern */: {
                     var importSpecifiers = ts.mapAllOrFail(name.elements, function (e) {
@@ -101055,7 +102783,7 @@ var ts;
                             : makeImportSpecifier(e.propertyName && e.propertyName.text, e.name.text);
                     }); // tslint:disable-line no-unnecessary-type-assertion (TODO: GH#18217)
                     if (importSpecifiers) {
-                        return [ts.makeImport(/*name*/ undefined, importSpecifiers, moduleSpecifier, preferences)];
+                        return [ts.makeImport(/*name*/ undefined, importSpecifiers, moduleSpecifier, quotePreference)];
                     }
                 }
                 // falls through -- object destructuring has an interesting pattern and must be a variable declaration
@@ -101066,12 +102794,12 @@ var ts;
                     */
                     var tmp = makeUniqueName(codefix.moduleSpecifierToValidIdentifier(moduleSpecifier.text, target), identifiers);
                     return [
-                        ts.makeImport(ts.createIdentifier(tmp), /*namedImports*/ undefined, moduleSpecifier, preferences),
+                        ts.makeImport(ts.createIdentifier(tmp), /*namedImports*/ undefined, moduleSpecifier, quotePreference),
                         makeConst(/*modifiers*/ undefined, ts.getSynthesizedDeepClone(name), ts.createIdentifier(tmp)),
                     ];
                 }
                 case 71 /* Identifier */:
-                    return convertSingleIdentifierImport(file, name, moduleSpecifier, changes, checker, identifiers, preferences);
+                    return convertSingleIdentifierImport(file, name, moduleSpecifier, changes, checker, identifiers, quotePreference);
                 default:
                     return ts.Debug.assertNever(name);
             }
@@ -101080,7 +102808,7 @@ var ts;
          * Convert `import x = require("x").`
          * Also converts uses like `x.y()` to `y()` and uses a named import.
          */
-        function convertSingleIdentifierImport(file, name, moduleSpecifier, changes, checker, identifiers, preferences) {
+        function convertSingleIdentifierImport(file, name, moduleSpecifier, changes, checker, identifiers, quotePreference) {
             var nameSymbol = checker.getSymbolAtLocation(name);
             // Maps from module property name to name actually used. (The same if there isn't shadowing.)
             var namedBindingsNames = ts.createMap();
@@ -101115,7 +102843,7 @@ var ts;
                 // If it was unused, ensure that we at least import *something*.
                 needDefaultImport = true;
             }
-            return [ts.makeImport(needDefaultImport ? ts.getSynthesizedDeepClone(name) : undefined, namedBindings, moduleSpecifier, preferences)];
+            return [ts.makeImport(needDefaultImport ? ts.getSynthesizedDeepClone(name) : undefined, namedBindings, moduleSpecifier, quotePreference)];
         }
         // Identifiers helpers
         function makeUniqueName(name, identifiers) {
@@ -101161,10 +102889,10 @@ var ts;
             return ts.createClassDeclaration(ts.getSynthesizedDeepClones(cls.decorators), // TODO: GH#19915 Don't think this is even legal.
             ts.concatenate(additionalModifiers, ts.getSynthesizedDeepClones(cls.modifiers)), name, ts.getSynthesizedDeepClones(cls.typeParameters), ts.getSynthesizedDeepClones(cls.heritageClauses), ts.getSynthesizedDeepClones(cls.members));
         }
-        function makeSingleImport(localName, propertyName, moduleSpecifier, preferences) {
+        function makeSingleImport(localName, propertyName, moduleSpecifier, quotePreference) {
             return propertyName === "default"
-                ? ts.makeImport(ts.createIdentifier(localName), /*namedImports*/ undefined, moduleSpecifier, preferences)
-                : ts.makeImport(/*name*/ undefined, [makeImportSpecifier(propertyName, localName)], moduleSpecifier, preferences);
+                ? ts.makeImport(ts.createIdentifier(localName), /*namedImports*/ undefined, moduleSpecifier, quotePreference)
+                : ts.makeImport(/*name*/ undefined, [makeImportSpecifier(propertyName, localName)], moduleSpecifier, quotePreference);
         }
         function makeImportSpecifier(propertyName, name) {
             return ts.createImportSpecifier(propertyName !== undefined && propertyName !== name ? ts.createIdentifier(propertyName) : undefined, ts.createIdentifier(name));
@@ -101436,7 +103164,7 @@ var ts;
             var sourceFile = context.sourceFile, symbolName = context.symbolName, preferences = context.preferences;
             var lastImportDeclaration = ts.findLast(sourceFile.statements, ts.isAnyImportSyntax);
             var moduleSpecifierWithoutQuotes = ts.stripQuotes(moduleSpecifier);
-            var quotedModuleSpecifier = ts.createLiteral(moduleSpecifierWithoutQuotes, shouldUseSingleQuote(sourceFile, preferences));
+            var quotedModuleSpecifier = ts.makeStringLiteral(moduleSpecifierWithoutQuotes, ts.getQuotePreference(sourceFile, preferences));
             var importDecl = importKind !== 3 /* Equals */
                 ? ts.createImportDeclaration(
                 /*decorators*/ undefined, 
@@ -101457,15 +103185,6 @@ var ts;
             // are there are already a new line separating code and import statements.
             return createCodeAction(ts.Diagnostics.Import_0_from_module_1, [symbolName, moduleSpecifierWithoutQuotes], changes);
         }
-        function shouldUseSingleQuote(sourceFile, preferences) {
-            if (preferences.quotePreference) {
-                return preferences.quotePreference === "single";
-            }
-            else {
-                var firstModuleSpecifier = ts.firstOrUndefined(sourceFile.imports);
-                return !!firstModuleSpecifier && !ts.isStringDoubleQuoted(firstModuleSpecifier, sourceFile);
-            }
-        }
         function createImportClauseOfKind(kind, symbolName) {
             var id = ts.createIdentifier(symbolName);
             switch (kind) {
@@ -102419,6 +104138,7 @@ var ts;
             switch (token.kind) {
                 case 71 /* Identifier */:
                     tryDeleteIdentifier(changes, sourceFile, token, deletedAncestors, checker, isFixAll);
+                    deleteAssignments(changes, sourceFile, token, checker);
                     break;
                 case 152 /* PropertyDeclaration */:
                 case 246 /* NamespaceImport */:
@@ -102430,6 +104150,15 @@ var ts;
                     tryDeleteDefault(changes, sourceFile, token, deletedAncestors);
             }
         }
+        function deleteAssignments(changes, sourceFile, token, checker) {
+            ts.FindAllReferences.Core.eachSymbolReferenceInFile(token, checker, sourceFile, function (ref) {
+                if (ref.parent.kind === 185 /* PropertyAccessExpression */)
+                    ref = ref.parent;
+                if (ref.parent.kind === 200 /* BinaryExpression */ && ref.parent.parent.kind === 216 /* ExpressionStatement */) {
+                    changes.deleteNode(sourceFile, ref.parent.parent);
+                }
+            });
+        }
         function tryDeleteDefault(changes, sourceFile, token, deletedAncestors) {
             if (ts.isDeclarationName(token)) {
                 if (deletedAncestors)
@@ -102485,15 +104214,12 @@ var ts;
                     break;
                 case 182 /* BindingElement */: {
                     var pattern = parent.parent;
-                    switch (pattern.kind) {
-                        case 181 /* ArrayBindingPattern */:
-                            changes.deleteNode(sourceFile, parent); // Don't delete ','
-                            break;
-                        case 180 /* ObjectBindingPattern */:
-                            changes.deleteNodeInList(sourceFile, parent);
-                            break;
-                        default:
-                            return ts.Debug.assertNever(pattern);
+                    var preserveComma = pattern.kind === 181 /* ArrayBindingPattern */ && parent !== ts.last(pattern.elements);
+                    if (preserveComma) {
+                        changes.deleteNode(sourceFile, parent);
+                    }
+                    else {
+                        changes.deleteNodeInList(sourceFile, parent);
                     }
                     break;
                 }
@@ -103003,8 +104729,8 @@ var ts;
                         outputMethod(signature, modifiers, name, createStubbedMethodBody(preferences));
                         break;
                     }
-                    for (var _i = 0, signatures_8 = signatures; _i < signatures_8.length; _i++) {
-                        var signature = signatures_8[_i];
+                    for (var _i = 0, signatures_1 = signatures; _i < signatures_1.length; _i++) {
+                        var signature = signatures_1[_i];
                         // Need to ensure nodes are fresh each time so they can have different positions.
                         outputMethod(signature, ts.getSynthesizedDeepClones(modifiers, /*includeTrivia*/ false), ts.getSynthesizedDeepClone(name, /*includeTrivia*/ false));
                     }
@@ -103037,11 +104763,11 @@ var ts;
             return signatureDeclaration;
         }
         function createMethodFromCallExpression(_a, methodName, inJs, makeStatic, preferences) {
-            var typeArguments = _a.typeArguments, args = _a.arguments;
+            var typeArguments = _a.typeArguments, args = _a.arguments, parent = _a.parent;
             return ts.createMethod(
             /*decorators*/ undefined, 
             /*modifiers*/ makeStatic ? [ts.createToken(115 /* StaticKeyword */)] : undefined, 
-            /*asteriskToken*/ undefined, methodName, 
+            /*asteriskToken*/ ts.isYieldExpression(parent) ? ts.createToken(39 /* AsteriskToken */) : undefined, methodName, 
             /*questionToken*/ undefined, 
             /*typeParameters*/ inJs ? undefined : ts.map(typeArguments, function (_, i) {
                 return ts.createTypeParameterDeclaration(84 /* T */ + typeArguments.length - 1 <= 90 /* Z */ ? String.fromCharCode(84 /* T */ + i) : "T" + i);
@@ -103073,8 +104799,8 @@ var ts;
             var maxArgsSignature = signatures[0];
             var minArgumentCount = signatures[0].minArgumentCount;
             var someSigHasRestParameter = false;
-            for (var _i = 0, signatures_9 = signatures; _i < signatures_9.length; _i++) {
-                var sig = signatures_9[_i];
+            for (var _i = 0, signatures_2 = signatures; _i < signatures_2.length; _i++) {
+                var sig = signatures_2[_i];
                 minArgumentCount = Math.min(sig.minArgumentCount, minArgumentCount);
                 if (sig.hasRestParameter) {
                     someSigHasRestParameter = true;
@@ -103595,7 +105321,7 @@ var ts;
                     return checker.createArrayType(getParameterTypeFromCallContexts(0, usageContext.properties.get("push").callContexts, /*isRestParameter*/ false, checker));
                 }
                 else if (usageContext.properties || usageContext.callContexts || usageContext.constructContexts || usageContext.numberIndexContext || usageContext.stringIndexContext) {
-                    var members_6 = ts.createUnderscoreEscapedMap();
+                    var members_1 = ts.createUnderscoreEscapedMap();
                     var callSignatures = [];
                     var constructSignatures = [];
                     var stringIndexInfo = void 0;
@@ -103604,7 +105330,7 @@ var ts;
                         usageContext.properties.forEach(function (context, name) {
                             var symbol = checker.createSymbol(4 /* Property */, name);
                             symbol.type = getTypeFromUsageContext(context, checker) || checker.getAnyType();
-                            members_6.set(name, symbol);
+                            members_1.set(name, symbol);
                         });
                     }
                     if (usageContext.callContexts) {
@@ -103625,7 +105351,7 @@ var ts;
                     if (usageContext.stringIndexContext) {
                         stringIndexInfo = checker.createIndexInfo(getTypeFromUsageContext(usageContext.stringIndexContext, checker), /*isReadonly*/ false);
                     }
-                    return checker.createAnonymousType(/*symbol*/ undefined, members_6, callSignatures, constructSignatures, stringIndexInfo, numberIndexInfo); // TODO: GH#18217
+                    return checker.createAnonymousType(/*symbol*/ undefined, members_1, callSignatures, constructSignatures, stringIndexInfo, numberIndexInfo); // TODO: GH#18217
                 }
                 else {
                     return undefined;
@@ -103702,7 +105428,7 @@ var ts;
             var opts = context.program.getCompilerOptions();
             var variations = [];
             // import Bluebird from "bluebird";
-            variations.push(createAction(context, sourceFile, node, ts.makeImport(namespace.name, /*namedImports*/ undefined, node.moduleSpecifier, context.preferences)));
+            variations.push(createAction(context, sourceFile, node, ts.makeImport(namespace.name, /*namedImports*/ undefined, node.moduleSpecifier, ts.getQuotePreference(sourceFile, context.preferences))));
             if (ts.getEmitModuleKind(opts) === ts.ModuleKind.CommonJS) {
                 // import Bluebird = require("bluebird");
                 variations.push(createAction(context, sourceFile, node, ts.createImportEqualsDeclaration(
@@ -103832,14 +105558,8 @@ var ts;
             return getDefaultValueFromType(checker, checker.getTypeFromTypeNode(propertyDeclaration.type)); // TODO: GH#18217
         }
         function getDefaultValueFromType(checker, type) {
-            if (type.flags & 4 /* String */) {
-                return ts.createLiteral("");
-            }
-            else if (type.flags & 8 /* Number */) {
-                return ts.createNumericLiteral("0");
-            }
-            else if (type.flags & 16 /* Boolean */) {
-                return ts.createFalse();
+            if (type.flags & 256 /* BooleanLiteral */) {
+                return type === checker.getFalseType() ? ts.createFalse() : ts.createTrue();
             }
             else if (type.isLiteral()) {
                 return ts.createLiteral(type.value);
@@ -103856,307 +105576,13 @@ var ts;
                     return undefined;
                 return ts.createNew(ts.createIdentifier(type.symbol.name), /*typeArguments*/ undefined, /*argumentsArray*/ undefined);
             }
+            else if (checker.isArrayLikeType(type)) {
+                return ts.createArrayLiteral();
+            }
             return undefined;
         }
     })(codefix = ts.codefix || (ts.codefix = {}));
 })(ts || (ts = {}));
-// Used by importFixes to synthesize import module specifiers.
-/* @internal */
-var ts;
-(function (ts) {
-    var moduleSpecifiers;
-    (function (moduleSpecifiers) {
-        // Note: fromSourceFile is just for usesJsExtensionOnImports
-        function getModuleSpecifier(program, fromSourceFile, fromSourceFileName, toFileName, host, preferences) {
-            var info = getInfo(program.getCompilerOptions(), fromSourceFile, fromSourceFileName, host);
-            var compilerOptions = program.getCompilerOptions();
-            return getGlobalModuleSpecifier(toFileName, info, host, compilerOptions) ||
-                ts.first(getLocalModuleSpecifiers(toFileName, info, compilerOptions, preferences));
-        }
-        moduleSpecifiers.getModuleSpecifier = getModuleSpecifier;
-        // For each symlink/original for a module, returns a list of ways to import that file.
-        function getModuleSpecifiers(moduleSymbol, program, importingSourceFile, host, preferences) {
-            var ambient = tryGetModuleNameFromAmbientModule(moduleSymbol);
-            if (ambient)
-                return [[ambient]];
-            var compilerOptions = program.getCompilerOptions();
-            var info = getInfo(compilerOptions, importingSourceFile, importingSourceFile.fileName, host);
-            var modulePaths = getAllModulePaths(program, moduleSymbol.valueDeclaration.getSourceFile());
-            var global = ts.mapDefined(modulePaths, function (moduleFileName) { return getGlobalModuleSpecifier(moduleFileName, info, host, compilerOptions); });
-            return global.length ? global.map(function (g) { return [g]; }) : modulePaths.map(function (moduleFileName) {
-                return getLocalModuleSpecifiers(moduleFileName, info, compilerOptions, preferences);
-            });
-        }
-        moduleSpecifiers.getModuleSpecifiers = getModuleSpecifiers;
-        // importingSourceFileName is separate because getEditsForFileRename may need to specify an updated path
-        function getInfo(compilerOptions, importingSourceFile, importingSourceFileName, host) {
-            var moduleResolutionKind = ts.getEmitModuleResolutionKind(compilerOptions);
-            var addJsExtension = usesJsExtensionOnImports(importingSourceFile);
-            var getCanonicalFileName = ts.hostGetCanonicalFileName(host);
-            var sourceDirectory = ts.getDirectoryPath(importingSourceFileName);
-            return { moduleResolutionKind: moduleResolutionKind, addJsExtension: addJsExtension, getCanonicalFileName: getCanonicalFileName, sourceDirectory: sourceDirectory };
-        }
-        function getGlobalModuleSpecifier(moduleFileName, _a, host, compilerOptions) {
-            var addJsExtension = _a.addJsExtension, getCanonicalFileName = _a.getCanonicalFileName, sourceDirectory = _a.sourceDirectory;
-            return tryGetModuleNameFromTypeRoots(compilerOptions, host, getCanonicalFileName, moduleFileName, addJsExtension)
-                || tryGetModuleNameAsNodeModule(compilerOptions, moduleFileName, host, getCanonicalFileName, sourceDirectory)
-                || compilerOptions.rootDirs && tryGetModuleNameFromRootDirs(compilerOptions.rootDirs, moduleFileName, sourceDirectory, getCanonicalFileName);
-        }
-        function getLocalModuleSpecifiers(moduleFileName, _a, compilerOptions, preferences) {
-            var moduleResolutionKind = _a.moduleResolutionKind, addJsExtension = _a.addJsExtension, getCanonicalFileName = _a.getCanonicalFileName, sourceDirectory = _a.sourceDirectory;
-            var baseUrl = compilerOptions.baseUrl, paths = compilerOptions.paths;
-            var relativePath = removeExtensionAndIndexPostFix(ts.ensurePathIsNonModuleName(ts.getRelativePathFromDirectory(sourceDirectory, moduleFileName, getCanonicalFileName)), moduleResolutionKind, addJsExtension);
-            if (!baseUrl || preferences.importModuleSpecifierPreference === "relative") {
-                return [relativePath];
-            }
-            var relativeToBaseUrl = getRelativePathIfInDirectory(moduleFileName, baseUrl, getCanonicalFileName);
-            if (!relativeToBaseUrl) {
-                return [relativePath];
-            }
-            var importRelativeToBaseUrl = removeExtensionAndIndexPostFix(relativeToBaseUrl, moduleResolutionKind, addJsExtension);
-            if (paths) {
-                var fromPaths = tryGetModuleNameFromPaths(ts.removeFileExtension(relativeToBaseUrl), importRelativeToBaseUrl, paths);
-                if (fromPaths) {
-                    return [fromPaths];
-                }
-            }
-            if (preferences.importModuleSpecifierPreference === "non-relative") {
-                return [importRelativeToBaseUrl];
-            }
-            if (preferences.importModuleSpecifierPreference !== undefined)
-                ts.Debug.assertNever(preferences.importModuleSpecifierPreference);
-            if (isPathRelativeToParent(relativeToBaseUrl)) {
-                return [relativePath];
-            }
-            /*
-            Prefer a relative import over a baseUrl import if it doesn't traverse up to baseUrl.
-    
-            Suppose we have:
-                baseUrl = /base
-                sourceDirectory = /base/a/b
-                moduleFileName = /base/foo/bar
-            Then:
-                relativePath = ../../foo/bar
-                getRelativePathNParents(relativePath) = 2
-                pathFromSourceToBaseUrl = ../../
-                getRelativePathNParents(pathFromSourceToBaseUrl) = 2
-                2 < 2 = false
-            In this case we should prefer using the baseUrl path "/a/b" instead of the relative path "../../foo/bar".
-    
-            Suppose we have:
-                baseUrl = /base
-                sourceDirectory = /base/foo/a
-                moduleFileName = /base/foo/bar
-            Then:
-                relativePath = ../a
-                getRelativePathNParents(relativePath) = 1
-                pathFromSourceToBaseUrl = ../../
-                getRelativePathNParents(pathFromSourceToBaseUrl) = 2
-                1 < 2 = true
-            In this case we should prefer using the relative path "../a" instead of the baseUrl path "foo/a".
-            */
-            var pathFromSourceToBaseUrl = ts.ensurePathIsNonModuleName(ts.getRelativePathFromDirectory(sourceDirectory, baseUrl, getCanonicalFileName));
-            var relativeFirst = getRelativePathNParents(relativePath) < getRelativePathNParents(pathFromSourceToBaseUrl);
-            return relativeFirst ? [relativePath, importRelativeToBaseUrl] : [importRelativeToBaseUrl, relativePath];
-        }
-        function usesJsExtensionOnImports(_a) {
-            var imports = _a.imports;
-            return ts.firstDefined(imports, function (_a) {
-                var text = _a.text;
-                return ts.pathIsRelative(text) ? ts.fileExtensionIs(text, ".js" /* Js */) : undefined;
-            }) || false;
-        }
-        /**
-         * Looks for a existing imports that use symlinks to this module.
-         * Only if no symlink is available, the real path will be used.
-         */
-        function getAllModulePaths(program, _a) {
-            var fileName = _a.fileName;
-            var symlinks = ts.mapDefined(program.getSourceFiles(), function (sf) {
-                return sf.resolvedModules && ts.firstDefinedIterator(sf.resolvedModules.values(), function (res) {
-                    return res && res.resolvedFileName === fileName ? res.originalPath : undefined;
-                });
-            });
-            return symlinks.length === 0 ? [fileName] : symlinks;
-        }
-        function getRelativePathNParents(relativePath) {
-            var components = ts.getPathComponents(relativePath);
-            if (components[0] || components.length === 1)
-                return 0;
-            for (var i = 1; i < components.length; i++) {
-                if (components[i] !== "..")
-                    return i - 1;
-            }
-            return components.length - 1;
-        }
-        function tryGetModuleNameFromAmbientModule(moduleSymbol) {
-            var decl = moduleSymbol.valueDeclaration;
-            if (ts.isModuleDeclaration(decl) && ts.isStringLiteral(decl.name)) {
-                return decl.name.text;
-            }
-        }
-        function tryGetModuleNameFromPaths(relativeToBaseUrlWithIndex, relativeToBaseUrl, paths) {
-            for (var key in paths) {
-                for (var _i = 0, _a = paths[key]; _i < _a.length; _i++) {
-                    var patternText_1 = _a[_i];
-                    var pattern = ts.removeFileExtension(ts.normalizePath(patternText_1));
-                    var indexOfStar = pattern.indexOf("*");
-                    if (indexOfStar === 0 && pattern.length === 1) {
-                        continue;
-                    }
-                    else if (indexOfStar !== -1) {
-                        var prefix = pattern.substr(0, indexOfStar);
-                        var suffix = pattern.substr(indexOfStar + 1);
-                        if (relativeToBaseUrl.length >= prefix.length + suffix.length &&
-                            ts.startsWith(relativeToBaseUrl, prefix) &&
-                            ts.endsWith(relativeToBaseUrl, suffix)) {
-                            var matchedStar = relativeToBaseUrl.substr(prefix.length, relativeToBaseUrl.length - suffix.length);
-                            return key.replace("*", matchedStar);
-                        }
-                    }
-                    else if (pattern === relativeToBaseUrl || pattern === relativeToBaseUrlWithIndex) {
-                        return key;
-                    }
-                }
-            }
-        }
-        function tryGetModuleNameFromRootDirs(rootDirs, moduleFileName, sourceDirectory, getCanonicalFileName) {
-            var normalizedTargetPath = getPathRelativeToRootDirs(moduleFileName, rootDirs, getCanonicalFileName);
-            if (normalizedTargetPath === undefined) {
-                return undefined;
-            }
-            var normalizedSourcePath = getPathRelativeToRootDirs(sourceDirectory, rootDirs, getCanonicalFileName);
-            var relativePath = normalizedSourcePath !== undefined ? ts.ensurePathIsNonModuleName(ts.getRelativePathFromDirectory(normalizedSourcePath, normalizedTargetPath, getCanonicalFileName)) : normalizedTargetPath;
-            return ts.removeFileExtension(relativePath);
-        }
-        function tryGetModuleNameFromTypeRoots(options, host, getCanonicalFileName, moduleFileName, addJsExtension) {
-            var roots = ts.getEffectiveTypeRoots(options, host);
-            return ts.firstDefined(roots, function (unNormalizedTypeRoot) {
-                var typeRoot = ts.toPath(unNormalizedTypeRoot, /*basePath*/ undefined, getCanonicalFileName);
-                if (ts.startsWith(moduleFileName, typeRoot)) {
-                    // For a type definition, we can strip `/index` even with classic resolution.
-                    return removeExtensionAndIndexPostFix(moduleFileName.substring(typeRoot.length + 1), ts.ModuleResolutionKind.NodeJs, addJsExtension);
-                }
-            });
-        }
-        function tryGetModuleNameAsNodeModule(options, moduleFileName, host, getCanonicalFileName, sourceDirectory) {
-            if (ts.getEmitModuleResolutionKind(options) !== ts.ModuleResolutionKind.NodeJs) {
-                // nothing to do here
-                return undefined;
-            }
-            var parts = getNodeModulePathParts(moduleFileName);
-            if (!parts) {
-                return undefined;
-            }
-            // Simplify the full file path to something that can be resolved by Node.
-            // If the module could be imported by a directory name, use that directory's name
-            var moduleSpecifier = getDirectoryOrExtensionlessFileName(moduleFileName);
-            // Get a path that's relative to node_modules or the importing file's path
-            // if node_modules folder is in this folder or any of its parent folders, no need to keep it.
-            if (!ts.startsWith(sourceDirectory, moduleSpecifier.substring(0, parts.topLevelNodeModulesIndex)))
-                return undefined;
-            // If the module was found in @types, get the actual Node package name
-            return ts.getPackageNameFromAtTypesDirectory(moduleSpecifier.substring(parts.topLevelPackageNameIndex + 1));
-            function getDirectoryOrExtensionlessFileName(path) {
-                // If the file is the main module, it can be imported by the package name
-                var packageRootPath = path.substring(0, parts.packageRootIndex);
-                var packageJsonPath = ts.combinePaths(packageRootPath, "package.json");
-                if (host.fileExists(packageJsonPath)) { // TODO: GH#18217
-                    var packageJsonContent = JSON.parse(host.readFile(packageJsonPath));
-                    if (packageJsonContent) {
-                        var mainFileRelative = packageJsonContent.typings || packageJsonContent.types || packageJsonContent.main;
-                        if (mainFileRelative) {
-                            var mainExportFile = ts.toPath(mainFileRelative, packageRootPath, getCanonicalFileName);
-                            if (mainExportFile === getCanonicalFileName(path)) {
-                                return packageRootPath;
-                            }
-                        }
-                    }
-                }
-                // We still have a file name - remove the extension
-                var fullModulePathWithoutExtension = ts.removeFileExtension(path);
-                // If the file is /index, it can be imported by its directory name
-                if (getCanonicalFileName(fullModulePathWithoutExtension.substring(parts.fileNameIndex)) === "/index") {
-                    return fullModulePathWithoutExtension.substring(0, parts.fileNameIndex);
-                }
-                return fullModulePathWithoutExtension;
-            }
-        }
-        function getNodeModulePathParts(fullPath) {
-            // If fullPath can't be valid module file within node_modules, returns undefined.
-            // Example of expected pattern: /base/path/node_modules/[@scope/otherpackage/@otherscope/node_modules/]package/[subdirectory/]file.js
-            // Returns indices:                       ^            ^                                                      ^             ^
-            var topLevelNodeModulesIndex = 0;
-            var topLevelPackageNameIndex = 0;
-            var packageRootIndex = 0;
-            var fileNameIndex = 0;
-            var States;
-            (function (States) {
-                States[States["BeforeNodeModules"] = 0] = "BeforeNodeModules";
-                States[States["NodeModules"] = 1] = "NodeModules";
-                States[States["Scope"] = 2] = "Scope";
-                States[States["PackageContent"] = 3] = "PackageContent";
-            })(States || (States = {}));
-            var partStart = 0;
-            var partEnd = 0;
-            var state = 0 /* BeforeNodeModules */;
-            while (partEnd >= 0) {
-                partStart = partEnd;
-                partEnd = fullPath.indexOf("/", partStart + 1);
-                switch (state) {
-                    case 0 /* BeforeNodeModules */:
-                        if (fullPath.indexOf("/node_modules/", partStart) === partStart) {
-                            topLevelNodeModulesIndex = partStart;
-                            topLevelPackageNameIndex = partEnd;
-                            state = 1 /* NodeModules */;
-                        }
-                        break;
-                    case 1 /* NodeModules */:
-                    case 2 /* Scope */:
-                        if (state === 1 /* NodeModules */ && fullPath.charAt(partStart + 1) === "@") {
-                            state = 2 /* Scope */;
-                        }
-                        else {
-                            packageRootIndex = partEnd;
-                            state = 3 /* PackageContent */;
-                        }
-                        break;
-                    case 3 /* PackageContent */:
-                        if (fullPath.indexOf("/node_modules/", partStart) === partStart) {
-                            state = 1 /* NodeModules */;
-                        }
-                        else {
-                            state = 3 /* PackageContent */;
-                        }
-                        break;
-                }
-            }
-            fileNameIndex = partStart;
-            return state > 1 /* NodeModules */ ? { topLevelNodeModulesIndex: topLevelNodeModulesIndex, topLevelPackageNameIndex: topLevelPackageNameIndex, packageRootIndex: packageRootIndex, fileNameIndex: fileNameIndex } : undefined;
-        }
-        function getPathRelativeToRootDirs(path, rootDirs, getCanonicalFileName) {
-            return ts.firstDefined(rootDirs, function (rootDir) {
-                var relativePath = getRelativePathIfInDirectory(path, rootDir, getCanonicalFileName); // TODO: GH#18217
-                return isPathRelativeToParent(relativePath) ? undefined : relativePath;
-            });
-        }
-        function removeExtensionAndIndexPostFix(fileName, moduleResolutionKind, addJsExtension) {
-            var noExtension = ts.removeFileExtension(fileName);
-            return addJsExtension
-                ? noExtension + ".js"
-                : moduleResolutionKind === ts.ModuleResolutionKind.NodeJs
-                    ? ts.removeSuffix(noExtension, "/index")
-                    : noExtension;
-        }
-        function getRelativePathIfInDirectory(path, directoryPath, getCanonicalFileName) {
-            var relativePath = ts.getRelativePathToDirectoryOrUrl(directoryPath, path, directoryPath, getCanonicalFileName, /*isAbsolutePathAnUrl*/ false);
-            return ts.isRootedDiskPath(relativePath) ? undefined : relativePath;
-        }
-        function isPathRelativeToParent(path) {
-            return ts.startsWith(path, "..");
-        }
-    })(moduleSpecifiers = ts.moduleSpecifiers || (ts.moduleSpecifiers = {}));
-})(ts || (ts = {}));
 /* @internal */
 var ts;
 (function (ts) {
@@ -104226,7 +105652,7 @@ var ts;
             }
         }
         function doChange(changes, sourceFile, info, preferences) {
-            changes.replaceNode(sourceFile, info.importNode, ts.makeImport(info.name, /*namedImports*/ undefined, info.moduleSpecifier, preferences));
+            changes.replaceNode(sourceFile, info.importNode, ts.makeImport(info.name, /*namedImports*/ undefined, info.moduleSpecifier, ts.getQuotePreference(sourceFile, preferences)));
         }
     })(codefix = ts.codefix || (ts.codefix = {}));
 })(ts || (ts = {}));
@@ -104412,7 +105838,7 @@ var ts;
                 });
                 var namespaceImportName = namespaceNameConflicts ? ts.getUniqueName(preferredName, sourceFile) : preferredName;
                 var neededNamedImports = [];
-                var _loop_22 = function (element) {
+                var _loop_11 = function (element) {
                     var propertyName = (element.propertyName || element.name).text;
                     ts.FindAllReferences.Core.eachSymbolReferenceInFile(element.name, checker, sourceFile, function (id) {
                         var access = ts.createPropertyAccess(ts.createIdentifier(namespaceImportName), propertyName);
@@ -104431,7 +105857,7 @@ var ts;
                 };
                 for (var _i = 0, _a = toConvert.elements; _i < _a.length; _i++) {
                     var element = _a[_i];
-                    _loop_22(element);
+                    _loop_11(element);
                 }
                 changes.replaceNode(sourceFile, toConvert, ts.createNamespaceImport(ts.createIdentifier(namespaceImportName)));
                 if (neededNamedImports.length) {
@@ -105490,8 +106916,8 @@ var ts;
                 ts.Debug.assert(members.length > 0); // There must be at least one child, since we extracted from one.
                 var prevMember;
                 var allProperties = true;
-                for (var _i = 0, members_7 = members; _i < members_7.length; _i++) {
-                    var member = members_7[_i];
+                for (var _i = 0, members_2 = members; _i < members_2.length; _i++) {
+                    var member = members_2[_i];
                     if (member.pos > maxPos) {
                         return prevMember || members[0];
                     }
@@ -105665,7 +107091,7 @@ var ts;
                         : ts.getEnclosingBlockScopeContainer(scopes[0]);
                     ts.forEachChild(containingLexicalScopeOfExtraction, checkForUsedDeclarations);
                 }
-                var _loop_23 = function (i) {
+                var _loop_12 = function (i) {
                     var scopeUsages = usagesPerScope[i];
                     // Special case: in the innermost scope, all usages are available.
                     // (The computed value reflects the value at the top-level of the scope, but the
@@ -105705,7 +107131,7 @@ var ts;
                     }
                 };
                 for (var i = 0; i < scopes.length; i++) {
-                    _loop_23(i);
+                    _loop_12(i);
                 }
                 return { target: target, usagesPerScope: usagesPerScope, functionErrorsPerScope: functionErrorsPerScope, constantErrorsPerScope: constantErrorsPerScope, exposedVariableDeclarations: exposedVariableDeclarations };
                 function isInGenericContext(node) {
@@ -106230,14 +107656,15 @@ var ts;
                 return toMove.all;
             }
             var useEs6ModuleSyntax = !!oldFile.externalModuleIndicator;
-            var importsFromNewFile = createOldFileImportsFromNewFile(usage.oldFileImportsFromNewFile, newModuleName, useEs6ModuleSyntax, preferences);
+            var quotePreference = ts.getQuotePreference(oldFile, preferences);
+            var importsFromNewFile = createOldFileImportsFromNewFile(usage.oldFileImportsFromNewFile, newModuleName, useEs6ModuleSyntax, quotePreference);
             if (importsFromNewFile) {
                 changes.insertNodeBefore(oldFile, oldFile.statements[0], importsFromNewFile, /*blankLineBetween*/ true);
             }
             deleteUnusedOldImports(oldFile, toMove.all, changes, usage.unusedImportsFromOldFile, checker);
             deleteMovedStatements(oldFile, toMove.ranges, changes);
             updateImportsInOtherFiles(changes, program, oldFile, usage.movedSymbols, newModuleName);
-            return getNewFileImportsAndAddExportInOldFile(oldFile, usage.oldImportsNeededByNewFile, usage.newFileImportsFromOldFile, changes, checker, useEs6ModuleSyntax, preferences).concat(addExports(oldFile, toMove.all, usage.oldFileImportsFromNewFile, useEs6ModuleSyntax));
+            return getNewFileImportsAndAddExportInOldFile(oldFile, usage.oldImportsNeededByNewFile, usage.newFileImportsFromOldFile, changes, checker, useEs6ModuleSyntax, quotePreference).concat(addExports(oldFile, toMove.all, usage.oldFileImportsFromNewFile, useEs6ModuleSyntax));
         }
         function deleteMovedStatements(sourceFile, moved, changes) {
             for (var _i = 0, moved_1 = moved; _i < moved_1.length; _i++) {
@@ -106255,10 +107682,10 @@ var ts;
         }
         function updateImportsInOtherFiles(changes, program, oldFile, movedSymbols, newModuleName) {
             var checker = program.getTypeChecker();
-            var _loop_24 = function (sourceFile) {
+            var _loop_13 = function (sourceFile) {
                 if (sourceFile === oldFile)
                     return "continue";
-                var _loop_25 = function (statement) {
+                var _loop_14 = function (statement) {
                     forEachImportInStatement(statement, function (importNode) {
                         if (checker.getSymbolAtLocation(moduleSpecifierFromImport(importNode)) !== oldFile.symbol)
                             return;
@@ -106280,12 +107707,12 @@ var ts;
                 };
                 for (var _i = 0, _a = sourceFile.statements; _i < _a.length; _i++) {
                     var statement = _a[_i];
-                    _loop_25(statement);
+                    _loop_14(statement);
                 }
             };
             for (var _i = 0, _a = program.getSourceFiles(); _i < _a.length; _i++) {
                 var sourceFile = _a[_i];
-                _loop_24(sourceFile);
+                _loop_13(sourceFile);
             }
         }
         function getNamespaceLikeImport(node) {
@@ -106361,7 +107788,7 @@ var ts;
                 }
             }
         }
-        function createOldFileImportsFromNewFile(newFileNeedExport, newFileNameWithExtension, useEs6Imports, preferences) {
+        function createOldFileImportsFromNewFile(newFileNeedExport, newFileNameWithExtension, useEs6Imports, quotePreference) {
             var defaultImport;
             var imports = [];
             newFileNeedExport.forEach(function (symbol) {
@@ -106372,13 +107799,13 @@ var ts;
                     imports.push(symbol.name);
                 }
             });
-            return makeImportOrRequire(defaultImport, imports, newFileNameWithExtension, useEs6Imports, preferences);
+            return makeImportOrRequire(defaultImport, imports, newFileNameWithExtension, useEs6Imports, quotePreference);
         }
-        function makeImportOrRequire(defaultImport, imports, path, useEs6Imports, preferences) {
+        function makeImportOrRequire(defaultImport, imports, path, useEs6Imports, quotePreference) {
             path = ts.ensurePathIsNonModuleName(path);
             if (useEs6Imports) {
                 var specifiers = imports.map(function (i) { return ts.createImportSpecifier(/*propertyName*/ undefined, ts.createIdentifier(i)); });
-                return ts.makeImportIfNecessary(defaultImport, specifiers, path, preferences);
+                return ts.makeImportIfNecessary(defaultImport, specifiers, path, quotePreference);
             }
             else {
                 ts.Debug.assert(!defaultImport); // If there's a default export, it should have been an es6 module.
@@ -106400,9 +107827,9 @@ var ts;
                 if (isTopLevelDeclarationStatement(statement) &&
                     !isExported(sourceFile, statement, useEs6Exports) &&
                     forEachTopLevelDeclaration(statement, function (d) { return needExport.has(ts.Debug.assertDefined(d.symbol)); })) {
-                    var exports_2 = addExport(statement, useEs6Exports);
-                    if (exports_2)
-                        return exports_2;
+                    var exports = addExport(statement, useEs6Exports);
+                    if (exports)
+                        return exports;
                 }
                 return statement;
             });
@@ -106477,7 +107904,7 @@ var ts;
                     break;
             }
         }
-        function getNewFileImportsAndAddExportInOldFile(oldFile, importsToCopy, newFileImportsFromOldFile, changes, checker, useEs6ModuleSyntax, preferences) {
+        function getNewFileImportsAndAddExportInOldFile(oldFile, importsToCopy, newFileImportsFromOldFile, changes, checker, useEs6ModuleSyntax, quotePreference) {
             var copiedOldImports = [];
             for (var _i = 0, _a = oldFile.statements; _i < _a.length; _i++) {
                 var oldStatement = _a[_i];
@@ -106509,7 +107936,7 @@ var ts;
                     }
                 }
             });
-            ts.append(copiedOldImports, makeImportOrRequire(oldFileDefault, oldFileNamedImports, ts.removeFileExtension(ts.getBaseFileName(oldFile.fileName)), useEs6ModuleSyntax, preferences));
+            ts.append(copiedOldImports, makeImportOrRequire(oldFileDefault, oldFileNamedImports, ts.removeFileExtension(ts.getBaseFileName(oldFile.fileName)), useEs6ModuleSyntax, quotePreference));
             return copiedOldImports;
         }
         function makeUniqueModuleName(moduleName, extension, inDirectory, host) {
@@ -107188,8 +108615,8 @@ var ts;
         var list = createNode(299 /* SyntaxList */, nodes.pos, nodes.end, parent);
         list._children = [];
         var pos = nodes.pos;
-        for (var _i = 0, nodes_7 = nodes; _i < nodes_7.length; _i++) {
-            var node = nodes_7[_i];
+        for (var _i = 0, nodes_1 = nodes; _i < nodes_1.length; _i++) {
+            var node = nodes_1[_i];
             addSyntheticNodes(list._children, pos, node.pos, parent);
             list._children.push(node);
             pos = node.end;
@@ -107372,7 +108799,7 @@ var ts;
             return !!(this.flags & 786432 /* UnionOrIntersection */);
         };
         TypeObject.prototype.isLiteral = function () {
-            return !!(this.flags & 448 /* Literal */);
+            return !!(this.flags & 192 /* StringOrNumberLiteral */);
         };
         TypeObject.prototype.isStringLiteral = function () {
             return !!(this.flags & 64 /* StringLiteral */);
@@ -107431,8 +108858,8 @@ var ts;
             return ts.emptyArray;
         var doc = ts.JsDoc.getJsDocCommentsFromDeclarations(declarations);
         if (doc.length === 0 || declarations.some(hasJSDocInheritDocTag)) {
-            for (var _i = 0, declarations_14 = declarations; _i < declarations_14.length; _i++) {
-                var declaration = declarations_14[_i];
+            for (var _i = 0, declarations_5 = declarations; _i < declarations_5.length; _i++) {
+                var declaration = declarations_5[_i];
                 var inheritedDocs = findInheritedJSDocComments(declaration, declaration.symbol.name, checker); // TODO: GH#18217
                 // TODO: GH#16312 Return a ReadonlyArray, avoid copying inheritedDocs
                 if (inheritedDocs)
@@ -107927,9 +109354,9 @@ var ts;
     }
     ts.createSourceFileLikeCache = createSourceFileLikeCache;
     function createLanguageService(host, documentRegistry, syntaxOnly) {
-        var _a;
         if (documentRegistry === void 0) { documentRegistry = ts.createDocumentRegistry(host.useCaseSensitiveFileNames && host.useCaseSensitiveFileNames(), host.getCurrentDirectory()); }
         if (syntaxOnly === void 0) { syntaxOnly = false; }
+        var _a;
         var syntaxTreeCache = new SyntaxTreeCache(host);
         var program;
         var lastProjectVersion;
@@ -108186,7 +109613,7 @@ var ts;
         function getQuickInfoAtPosition(fileName, position) {
             synchronizeHostData();
             var sourceFile = getValidSourceFile(fileName);
-            var node = ts.getTouchingPropertyName(sourceFile, position, /*includeJsDocComment*/ true);
+            var node = ts.getTouchingPropertyName(sourceFile, position);
             if (node === sourceFile) {
                 // Avoid giving quickInfo for the sourceFile as a whole.
                 return undefined;
@@ -108208,14 +109635,14 @@ var ts;
                     case 174 /* ThisType */:
                     case 97 /* SuperKeyword */:
                         // For the identifiers/this/super etc get the type at position
-                        var type_4 = typeChecker.getTypeAtLocation(node);
-                        return type_4 && {
+                        var type_1 = typeChecker.getTypeAtLocation(node);
+                        return type_1 && {
                             kind: "" /* unknown */,
                             kindModifiers: "" /* none */,
                             textSpan: ts.createTextSpanFromNode(node, sourceFile),
-                            displayParts: typeChecker.runWithCancellationToken(cancellationToken, function (typeChecker) { return ts.typeToDisplayParts(typeChecker, type_4, ts.getContainerNode(node)); }),
-                            documentation: type_4.symbol ? type_4.symbol.getDocumentationComment(typeChecker) : undefined,
-                            tags: type_4.symbol ? type_4.symbol.getJsDocTags() : undefined
+                            displayParts: typeChecker.runWithCancellationToken(cancellationToken, function (typeChecker) { return ts.typeToDisplayParts(typeChecker, type_1, ts.getContainerNode(node)); }),
+                            documentation: type_1.symbol ? type_1.symbol.getDocumentationComment(typeChecker) : undefined,
+                            tags: type_1.symbol ? type_1.symbol.getJsDocTags() : undefined
                         };
                 }
                 return undefined;
@@ -108324,15 +109751,15 @@ var ts;
                 if (original === void 0) { original = input; }
                 var info = extract(input);
                 if (ts.endsWith(info.fileName, ".d.ts" /* Dts */)) {
-                    var file_18 = program.getSourceFile(info.fileName);
-                    if (!file_18) {
+                    var file = program.getSourceFile(info.fileName);
+                    if (!file) {
                         var path = ts.toPath(info.fileName, currentDirectory, getCanonicalFileName);
-                        file_18 = sourcemappedFileCache.get(path);
+                        file = sourcemappedFileCache.get(path);
                     }
-                    if (!file_18) {
+                    if (!file) {
                         return input;
                     }
-                    var mapper = getSourceMapper(info.fileName, file_18);
+                    var mapper = getSourceMapper(info.fileName, file);
                     var newLoc = mapper.getOriginalPosition(info);
                     if (newLoc === info)
                         return input;
@@ -108464,7 +109891,7 @@ var ts;
         function getNameOrDottedNameSpan(fileName, startPos, _endPos) {
             var sourceFile = syntaxTreeCache.getCurrentSourceFile(fileName);
             // Get node at the location
-            var node = ts.getTouchingPropertyName(sourceFile, startPos, /*includeJsDocComment*/ false);
+            var node = ts.getTouchingPropertyName(sourceFile, startPos);
             if (node === sourceFile) {
                 return undefined;
             }
@@ -108976,20 +110403,20 @@ var ts;
     function getPropertySymbolsFromType(type, propName) {
         var name = ts.unescapeLeadingUnderscores(ts.getTextOfPropertyName(propName));
         if (name && type) {
-            var result_7 = [];
+            var result_2 = [];
             var symbol = type.getProperty(name);
             if (type.flags & 262144 /* Union */) {
                 ts.forEach(type.types, function (t) {
                     var symbol = t.getProperty(name);
                     if (symbol) {
-                        result_7.push(symbol);
+                        result_2.push(symbol);
                     }
                 });
-                return result_7;
+                return result_2;
             }
             if (symbol) {
-                result_7.push(symbol);
-                return result_7;
+                result_2.push(symbol);
+                return result_2;
             }
         }
         return undefined;
@@ -110277,7 +111704,8 @@ var ts;
                     importedFiles: _this.convertFileReferences(result.importedFiles),
                     ambientExternalModules: result.ambientExternalModules,
                     isLibFile: result.isLibFile,
-                    typeReferenceDirectives: _this.convertFileReferences(result.typeReferenceDirectives)
+                    typeReferenceDirectives: _this.convertFileReferences(result.typeReferenceDirectives),
+                    libReferenceDirectives: _this.convertFileReferences(result.libReferenceDirectives)
                 };
             });
         };
@@ -110293,8 +111721,8 @@ var ts;
                 return undefined;
             }
             var result = [];
-            for (var _i = 0, refs_2 = refs; _i < refs_2.length; _i++) {
-                var ref = refs_2[_i];
+            for (var _i = 0, refs_1 = refs; _i < refs_1.length; _i++) {
+                var ref = refs_1[_i];
                 result.push({
                     path: ts.normalizeSlashes(ref.fileName),
                     position: ref.pos,
@@ -110416,3 +111844,6 @@ var TypeScript;
 // TODO: it should be moved into a namespace though.
 /* @internal */
 var toolsVersion = ts.versionMajorMinor;
+//# sourceMappingURL=services.js.map
+// Delete soon
+//# sourceMappingURL=typescriptServices.js.map
\ No newline at end of file
diff --git a/lib/typingsInstaller.js b/lib/typingsInstaller.js
index ba3e6d73daf..942c4989855 100644
--- a/lib/typingsInstaller.js
+++ b/lib/typingsInstaller.js
@@ -1,27 +1,4 @@
-/*! *****************************************************************************
-Copyright (c) Microsoft Corporation. All rights reserved. 
-Licensed under the Apache License, Version 2.0 (the "License"); you may not use
-this file except in compliance with the License. You may obtain a copy of the
-License at http://www.apache.org/licenses/LICENSE-2.0  
- 
-THIS CODE IS PROVIDED ON AN *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
-KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
-WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE, 
-MERCHANTABLITY OR NON-INFRINGEMENT. 
- 
-See the Apache Version 2.0 License for specific language governing permissions
-and limitations under the License.
-***************************************************************************** */
-
 "use strict";
-var __assign = (this && this.__assign) || Object.assign || function(t) {
-    for (var s, i = 1, n = arguments.length; i < n; i++) {
-        s = arguments[i];
-        for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
-            t[p] = s[p];
-    }
-    return t;
-};
 var __extends = (this && this.__extends) || (function () {
     var extendStatics = Object.setPrototypeOf ||
         ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
@@ -32,107 +9,38 @@ var __extends = (this && this.__extends) || (function () {
         d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
     };
 })();
+var __assign = (this && this.__assign) || Object.assign || function(t) {
+    for (var s, i = 1, n = arguments.length; i < n; i++) {
+        s = arguments[i];
+        for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
+            t[p] = s[p];
+    }
+    return t;
+};
+"use strict";
+/*@internal*/
 var ts;
 (function (ts) {
-    var OperationCanceledException = (function () {
-        function OperationCanceledException() {
-        }
-        return OperationCanceledException;
-    }());
-    ts.OperationCanceledException = OperationCanceledException;
-    var ExitStatus;
-    (function (ExitStatus) {
-        ExitStatus[ExitStatus["Success"] = 0] = "Success";
-        ExitStatus[ExitStatus["DiagnosticsPresent_OutputsSkipped"] = 1] = "DiagnosticsPresent_OutputsSkipped";
-        ExitStatus[ExitStatus["DiagnosticsPresent_OutputsGenerated"] = 2] = "DiagnosticsPresent_OutputsGenerated";
-    })(ExitStatus = ts.ExitStatus || (ts.ExitStatus = {}));
-    var TypeReferenceSerializationKind;
-    (function (TypeReferenceSerializationKind) {
-        TypeReferenceSerializationKind[TypeReferenceSerializationKind["Unknown"] = 0] = "Unknown";
-        TypeReferenceSerializationKind[TypeReferenceSerializationKind["TypeWithConstructSignatureAndValue"] = 1] = "TypeWithConstructSignatureAndValue";
-        TypeReferenceSerializationKind[TypeReferenceSerializationKind["VoidNullableOrNeverType"] = 2] = "VoidNullableOrNeverType";
-        TypeReferenceSerializationKind[TypeReferenceSerializationKind["NumberLikeType"] = 3] = "NumberLikeType";
-        TypeReferenceSerializationKind[TypeReferenceSerializationKind["StringLikeType"] = 4] = "StringLikeType";
-        TypeReferenceSerializationKind[TypeReferenceSerializationKind["BooleanType"] = 5] = "BooleanType";
-        TypeReferenceSerializationKind[TypeReferenceSerializationKind["ArrayLikeType"] = 6] = "ArrayLikeType";
-        TypeReferenceSerializationKind[TypeReferenceSerializationKind["ESSymbolType"] = 7] = "ESSymbolType";
-        TypeReferenceSerializationKind[TypeReferenceSerializationKind["Promise"] = 8] = "Promise";
-        TypeReferenceSerializationKind[TypeReferenceSerializationKind["TypeWithCallSignature"] = 9] = "TypeWithCallSignature";
-        TypeReferenceSerializationKind[TypeReferenceSerializationKind["ObjectType"] = 10] = "ObjectType";
-    })(TypeReferenceSerializationKind = ts.TypeReferenceSerializationKind || (ts.TypeReferenceSerializationKind = {}));
-    var DiagnosticCategory;
-    (function (DiagnosticCategory) {
-        DiagnosticCategory[DiagnosticCategory["Warning"] = 0] = "Warning";
-        DiagnosticCategory[DiagnosticCategory["Error"] = 1] = "Error";
-        DiagnosticCategory[DiagnosticCategory["Suggestion"] = 2] = "Suggestion";
-        DiagnosticCategory[DiagnosticCategory["Message"] = 3] = "Message";
-    })(DiagnosticCategory = ts.DiagnosticCategory || (ts.DiagnosticCategory = {}));
-    function diagnosticCategoryName(d, lowerCase) {
-        if (lowerCase === void 0) { lowerCase = true; }
-        var name = DiagnosticCategory[d.category];
-        return lowerCase ? name.toLowerCase() : name;
-    }
-    ts.diagnosticCategoryName = diagnosticCategoryName;
-    var ModuleResolutionKind;
-    (function (ModuleResolutionKind) {
-        ModuleResolutionKind[ModuleResolutionKind["Classic"] = 1] = "Classic";
-        ModuleResolutionKind[ModuleResolutionKind["NodeJs"] = 2] = "NodeJs";
-    })(ModuleResolutionKind = ts.ModuleResolutionKind || (ts.ModuleResolutionKind = {}));
-    var ModuleKind;
-    (function (ModuleKind) {
-        ModuleKind[ModuleKind["None"] = 0] = "None";
-        ModuleKind[ModuleKind["CommonJS"] = 1] = "CommonJS";
-        ModuleKind[ModuleKind["AMD"] = 2] = "AMD";
-        ModuleKind[ModuleKind["UMD"] = 3] = "UMD";
-        ModuleKind[ModuleKind["System"] = 4] = "System";
-        ModuleKind[ModuleKind["ES2015"] = 5] = "ES2015";
-        ModuleKind[ModuleKind["ESNext"] = 6] = "ESNext";
-    })(ModuleKind = ts.ModuleKind || (ts.ModuleKind = {}));
-    function _contextuallyTypePragmas(args) {
-        return args;
-    }
-    ts.commentPragmas = _contextuallyTypePragmas({
-        "reference": {
-            args: [
-                { name: "types", optional: true, captureSpan: true },
-                { name: "path", optional: true, captureSpan: true },
-                { name: "no-default-lib", optional: true }
-            ],
-            kind: 1
-        },
-        "amd-dependency": {
-            args: [{ name: "path" }, { name: "name", optional: true }],
-            kind: 1
-        },
-        "amd-module": {
-            args: [{ name: "name" }],
-            kind: 1
-        },
-        "ts-check": {
-            kind: 2
-        },
-        "ts-nocheck": {
-            kind: 2
-        },
-        "jsx": {
-            args: [{ name: "factory" }],
-            kind: 4
-        },
-    });
-})(ts || (ts = {}));
-var ts;
-(function (ts) {
+    /** Gets a timestamp with (at least) ms resolution */
     ts.timestamp = typeof performance !== "undefined" && performance.now ? function () { return performance.now(); } : Date.now ? Date.now : function () { return +(new Date()); };
 })(ts || (ts = {}));
+/*@internal*/
+/** Performance measurements for the compiler. */
 (function (ts) {
     var performance;
     (function (performance) {
+        // NOTE: cannot use ts.noop as core.ts loads after this
         var profilerEvent = typeof onProfilerEvent === "function" && onProfilerEvent.profiler === true ? onProfilerEvent : function () { };
         var enabled = false;
         var profilerStart = 0;
         var counts;
         var marks;
         var measures;
+        /**
+         * Marks a performance event.
+         *
+         * @param markName The name of the mark.
+         */
         function mark(markName) {
             if (enabled) {
                 marks.set(markName, ts.timestamp());
@@ -141,6 +49,15 @@ var ts;
             }
         }
         performance.mark = mark;
+        /**
+         * Adds a performance measurement with the specified name.
+         *
+         * @param measureName The name of the performance measurement.
+         * @param startMarkName The name of the starting mark. If not supplied, the point at which the
+         *      profiler was enabled is used.
+         * @param endMarkName The name of the ending mark. If not supplied, the current timestamp is
+         *      used.
+         */
         function measure(measureName, startMarkName, endMarkName) {
             if (enabled) {
                 var end = endMarkName && marks.get(endMarkName) || ts.timestamp();
@@ -149,20 +66,36 @@ var ts;
             }
         }
         performance.measure = measure;
+        /**
+         * Gets the number of times a marker was encountered.
+         *
+         * @param markName The name of the mark.
+         */
         function getCount(markName) {
             return counts && counts.get(markName) || 0;
         }
         performance.getCount = getCount;
+        /**
+         * Gets the total duration of all measurements with the supplied name.
+         *
+         * @param measureName The name of the measure whose durations should be accumulated.
+         */
         function getDuration(measureName) {
             return measures && measures.get(measureName) || 0;
         }
         performance.getDuration = getDuration;
+        /**
+         * Iterate over each measure, performing some action
+         *
+         * @param cb The action to perform for each measure
+         */
         function forEachMeasure(cb) {
             measures.forEach(function (measure, key) {
                 cb(key, measure);
             });
         }
         performance.forEachMeasure = forEachMeasure;
+        /** Enables (and resets) performance measurements for the compiler. */
         function enable() {
             counts = ts.createMap();
             marks = ts.createMap();
@@ -171,6 +104,7 @@ var ts;
             profilerStart = ts.timestamp();
         }
         performance.enable = enable;
+        /** Disables performance measurements for the compiler. */
         function disable() {
             enabled = false;
         }
@@ -179,52 +113,48 @@ var ts;
 })(ts || (ts = {}));
 var ts;
 (function (ts) {
+    // WARNING: The script `configureNightly.ts` uses a regexp to parse out these values.
+    // If changing the text in this section, be sure to test `configureNightly` too.
     ts.versionMajorMinor = "3.0";
+    /** The version of the TypeScript compiler release */
     ts.version = ts.versionMajorMinor + ".0-dev";
 })(ts || (ts = {}));
+/* @internal */
 (function (ts) {
-    function isExternalModuleNameRelative(moduleName) {
-        return ts.pathIsRelative(moduleName) || ts.isRootedDiskPath(moduleName);
-    }
-    ts.isExternalModuleNameRelative = isExternalModuleNameRelative;
-    function sortAndDeduplicateDiagnostics(diagnostics) {
-        return ts.sortAndDeduplicate(diagnostics, ts.compareDiagnostics);
-    }
-    ts.sortAndDeduplicateDiagnostics = sortAndDeduplicateDiagnostics;
-})(ts || (ts = {}));
-(function (ts) {
-    ts.emptyArray = [];
-    function closeFileWatcher(watcher) {
-        watcher.close();
-    }
-    ts.closeFileWatcher = closeFileWatcher;
+    var Comparison;
+    (function (Comparison) {
+        Comparison[Comparison["LessThan"] = -1] = "LessThan";
+        Comparison[Comparison["EqualTo"] = 0] = "EqualTo";
+        Comparison[Comparison["GreaterThan"] = 1] = "GreaterThan";
+    })(Comparison = ts.Comparison || (ts.Comparison = {}));
+    /** Create a MapLike with good performance. */
     function createDictionaryObject() {
-        var map = Object.create(null);
+        var map = Object.create(/*prototype*/ null); // tslint:disable-line:no-null-keyword
+        // Using 'delete' on an object causes V8 to put the object in dictionary mode.
+        // This disables creation of hidden classes, which are expensive when an object is
+        // constantly changing shape.
         map.__ = undefined;
         delete map.__;
         return map;
     }
+    /** Create a new map. If a template object is provided, the map will copy entries from it. */
     function createMap() {
-        return new MapCtr();
+        return new ts.MapCtr();
     }
     ts.createMap = createMap;
-    function createUnderscoreEscapedMap() {
-        return new MapCtr();
-    }
-    ts.createUnderscoreEscapedMap = createUnderscoreEscapedMap;
-    function createSymbolTable(symbols) {
-        var result = createMap();
-        if (symbols) {
-            for (var _i = 0, symbols_1 = symbols; _i < symbols_1.length; _i++) {
-                var symbol = symbols_1[_i];
-                result.set(symbol.escapedName, symbol);
-            }
+    function createMapFromEntries(entries) {
+        var map = createMap();
+        for (var _i = 0, entries_1 = entries; _i < entries_1.length; _i++) {
+            var _a = entries_1[_i], key = _a[0], value = _a[1];
+            map.set(key, value);
         }
-        return result;
+        return map;
     }
-    ts.createSymbolTable = createSymbolTable;
+    ts.createMapFromEntries = createMapFromEntries;
     function createMapFromTemplate(template) {
-        var map = new MapCtr();
+        var map = new ts.MapCtr();
+        // Copies keys/values from template. Note that for..in will not throw if
+        // template is undefined, and instead will just exit the loop.
         for (var key in template) {
             if (hasOwnProperty.call(template, key)) {
                 map.set(key, template[key]);
@@ -233,9 +163,12 @@ var ts;
         return map;
     }
     ts.createMapFromTemplate = createMapFromTemplate;
-    var MapCtr = typeof Map !== "undefined" && "entries" in Map.prototype ? Map : shimMap();
+    // Internet Explorer's Map doesn't support iteration, so don't use it.
+    // tslint:disable-next-line no-in-operator variable-name
+    ts.MapCtr = typeof Map !== "undefined" && "entries" in Map.prototype ? Map : shimMap();
+    // Keep the class inside a function so it doesn't get compiled if it's not used.
     function shimMap() {
-        var MapIterator = (function () {
+        var MapIterator = /** @class */ (function () {
             function MapIterator(data, selector) {
                 this.index = 0;
                 this.data = data;
@@ -252,7 +185,7 @@ var ts;
             };
             return MapIterator;
         }());
-        return (function () {
+        return /** @class */ (function () {
             function class_1() {
                 this.data = createDictionaryObject();
                 this.size = 0;
@@ -268,6 +201,7 @@ var ts;
                 return this;
             };
             class_1.prototype.has = function (key) {
+                // tslint:disable-next-line:no-in-operator
                 return key in this.data;
             };
             class_1.prototype.delete = function (key) {
@@ -299,21 +233,15 @@ var ts;
             return class_1;
         }());
     }
-    function toPath(fileName, basePath, getCanonicalFileName) {
-        var nonCanonicalizedPath = isRootedDiskPath(fileName)
-            ? normalizePath(fileName)
-            : getNormalizedAbsolutePath(fileName, basePath);
-        return getCanonicalFileName(nonCanonicalizedPath);
-    }
-    ts.toPath = toPath;
     function length(array) {
         return array ? array.length : 0;
     }
     ts.length = length;
-    function hasEntries(map) {
-        return !!map && !!map.size;
-    }
-    ts.hasEntries = hasEntries;
+    /**
+     * Iterates through 'array' by index and performs the callback on each element of array until the callback
+     * returns a truthy value, then returns that value.
+     * If no such value is found, the callback is applied to each element of array and undefined is returned.
+     */
     function forEach(array, callback) {
         if (array) {
             for (var i = 0; i < array.length; i++) {
@@ -326,6 +254,7 @@ var ts;
         return undefined;
     }
     ts.forEach = forEach;
+    /** Like `forEach`, but suitable for use with numbers and strings (which may be falsy). */
     function firstDefined(array, callback) {
         if (array === undefined) {
             return undefined;
@@ -352,20 +281,6 @@ var ts;
         }
     }
     ts.firstDefinedIterator = firstDefinedIterator;
-    function findAncestor(node, callback) {
-        while (node) {
-            var result = callback(node);
-            if (result === "quit") {
-                return undefined;
-            }
-            else if (result) {
-                return node;
-            }
-            node = node.parent;
-        }
-        return undefined;
-    }
-    ts.findAncestor = findAncestor;
     function zipWith(arrayA, arrayB, callback) {
         var result = [];
         Debug.assertEqual(arrayA.length, arrayB.length);
@@ -398,6 +313,11 @@ var ts;
         return map;
     }
     ts.zipToMap = zipToMap;
+    /**
+     * Iterates through `array` by index and performs the callback on each element of array until the callback
+     * returns a falsey value, then returns false.
+     * If no such value is found, the callback is applied to each element of array and `true` is returned.
+     */
     function every(array, callback) {
         if (array) {
             for (var i = 0; i < array.length; i++) {
@@ -429,6 +349,7 @@ var ts;
         return undefined;
     }
     ts.findLast = findLast;
+    /** Works like Array.prototype.findIndex, returning `-1` if no element satisfying the predicate is found. */
     function findIndex(array, predicate, startIndex) {
         for (var i = startIndex || 0; i < array.length; i++) {
             if (predicate(array[i], i)) {
@@ -447,6 +368,10 @@ var ts;
         return -1;
     }
     ts.findLastIndex = findLastIndex;
+    /**
+     * Returns the first truthy result of `callback`, or else fails.
+     * This is like `forEach`, but never returns undefined.
+     */
     function findMap(array, callback) {
         for (var i = 0; i < array.length; i++) {
             var result = callback(array[i], i);
@@ -777,6 +702,7 @@ var ts;
         return false;
     }
     ts.some = some;
+    /** Calls the callback with (start, afterEnd) index pairs for each range where 'pred' is true. */
     function getRangesWhere(arr, pred, cb) {
         var start;
         for (var i = 0; i < arr.length; i++) {
@@ -803,6 +729,8 @@ var ts;
     }
     ts.concatenate = concatenate;
     function deduplicateRelational(array, equalityComparer, comparer) {
+        // Perform a stable sort of the array. This ensures the first entry in a list of
+        // duplicates remains the first entry in the result.
         var indices = array.map(function (_, i) { return i; });
         stableSortIndices(array, indices, comparer);
         var last = array[indices[0]];
@@ -815,6 +743,7 @@ var ts;
                 last = item;
             }
         }
+        // restore original order
         deduplicated.sort();
         return deduplicated.map(function (i) { return array[i]; });
     }
@@ -844,10 +773,13 @@ var ts;
         for (var i = 1; i < array.length; i++) {
             var next = array[i];
             switch (comparer(next, last)) {
+                // equality comparison
                 case true:
-                case 0:
+                // relational comparison
+                case 0 /* EqualTo */:
                     continue;
-                case -1:
+                case -1 /* LessThan */:
+                    // If `array` is sorted, `next` should **never** be less than `last`.
                     return Debug.fail("Array is unsorted.");
             }
             deduplicated.push(last = next);
@@ -885,25 +817,6 @@ var ts;
         return true;
     }
     ts.arrayIsEqualTo = arrayIsEqualTo;
-    function changesAffectModuleResolution(oldOptions, newOptions) {
-        return !oldOptions ||
-            (oldOptions.module !== newOptions.module) ||
-            (oldOptions.moduleResolution !== newOptions.moduleResolution) ||
-            (oldOptions.noResolve !== newOptions.noResolve) ||
-            (oldOptions.target !== newOptions.target) ||
-            (oldOptions.noLib !== newOptions.noLib) ||
-            (oldOptions.jsx !== newOptions.jsx) ||
-            (oldOptions.allowJs !== newOptions.allowJs) ||
-            (oldOptions.rootDir !== newOptions.rootDir) ||
-            (oldOptions.configFilePath !== newOptions.configFilePath) ||
-            (oldOptions.baseUrl !== newOptions.baseUrl) ||
-            (oldOptions.maxNodeModuleJsDepth !== newOptions.maxNodeModuleJsDepth) ||
-            !arrayIsEqualTo(oldOptions.lib, newOptions.lib) ||
-            !arrayIsEqualTo(oldOptions.typeRoots, newOptions.typeRoots) ||
-            !arrayIsEqualTo(oldOptions.rootDirs, newOptions.rootDirs) ||
-            !equalOwnProperties(oldOptions.paths, newOptions.paths);
-    }
-    ts.changesAffectModuleResolution = changesAffectModuleResolution;
     function compact(array) {
         var result;
         if (array) {
@@ -922,25 +835,41 @@ var ts;
         return result || array;
     }
     ts.compact = compact;
+    /**
+     * Gets the relative complement of `arrayA` with respect to `arrayB`, returning the elements that
+     * are not present in `arrayA` but are present in `arrayB`. Assumes both arrays are sorted
+     * based on the provided comparer.
+     */
     function relativeComplement(arrayA, arrayB, comparer) {
         if (!arrayB || !arrayA || arrayB.length === 0 || arrayA.length === 0)
             return arrayB;
         var result = [];
         loopB: for (var offsetA = 0, offsetB = 0; offsetB < arrayB.length; offsetB++) {
             if (offsetB > 0) {
-                Debug.assertGreaterThanOrEqual(comparer(arrayB[offsetB], arrayB[offsetB - 1]), 0);
+                // Ensure `arrayB` is properly sorted.
+                Debug.assertGreaterThanOrEqual(comparer(arrayB[offsetB], arrayB[offsetB - 1]), 0 /* EqualTo */);
             }
             loopA: for (var startA = offsetA; offsetA < arrayA.length; offsetA++) {
                 if (offsetA > startA) {
-                    Debug.assertGreaterThanOrEqual(comparer(arrayA[offsetA], arrayA[offsetA - 1]), 0);
+                    // Ensure `arrayA` is properly sorted. We only need to perform this check if
+                    // `offsetA` has changed since we entered the loop.
+                    Debug.assertGreaterThanOrEqual(comparer(arrayA[offsetA], arrayA[offsetA - 1]), 0 /* EqualTo */);
                 }
                 switch (comparer(arrayB[offsetB], arrayA[offsetA])) {
-                    case -1:
+                    case -1 /* LessThan */:
+                        // If B is less than A, B does not exist in arrayA. Add B to the result and
+                        // move to the next element in arrayB without changing the current position
+                        // in arrayA.
                         result.push(arrayB[offsetB]);
                         continue loopB;
-                    case 0:
+                    case 0 /* EqualTo */:
+                        // If B is equal to A, B exists in arrayA. Move to the next element in
+                        // arrayB without adding B to the result or changing the current position
+                        // in arrayA.
                         continue loopB;
-                    case 1:
+                    case 1 /* GreaterThan */:
+                        // If B is greater than A, we need to keep looking for B in arrayA. Move to
+                        // the next element in arrayA and recheck.
                         continue loopA;
                 }
             }
@@ -966,6 +895,10 @@ var ts;
         return to;
     }
     ts.append = append;
+    /**
+     * Gets the actual offset into an array for a relative offset. Negative offsets indicate a
+     * position offset from the end of the array.
+     */
     function toOffset(array, offset) {
         return offset < 0 ? array.length + offset : offset;
     }
@@ -984,6 +917,9 @@ var ts;
         return to;
     }
     ts.addRange = addRange;
+    /**
+     * @return Whether the value was added.
+     */
     function pushIfUnique(array, toAdd, equalityComparer) {
         if (contains(array, toAdd, equalityComparer)) {
             return false;
@@ -994,6 +930,9 @@ var ts;
         }
     }
     ts.pushIfUnique = pushIfUnique;
+    /**
+     * Unlike `pushIfUnique`, this can take `undefined` as an input, and returns a new array.
+     */
     function appendIfUnique(array, toAdd, equalityComparer) {
         if (array) {
             pushIfUnique(array, toAdd, equalityComparer);
@@ -1005,8 +944,12 @@ var ts;
     }
     ts.appendIfUnique = appendIfUnique;
     function stableSortIndices(array, indices, comparer) {
+        // sort indices by value then position
         indices.sort(function (x, y) { return comparer(array[x], array[y]) || compareValues(x, y); });
     }
+    /**
+     * Returns a new sorted array.
+     */
     function sort(array, comparer) {
         return array.slice().sort(comparer);
     }
@@ -1041,6 +984,9 @@ var ts;
             } };
     }
     ts.arrayIterator = arrayIterator;
+    /**
+     * Stable sort of an array. Elements equal to each other maintain their relative position in the array.
+     */
     function stableSort(array, comparer) {
         var indices = array.map(function (_, i) { return i; });
         stableSortIndices(array, indices, comparer);
@@ -1057,6 +1003,10 @@ var ts;
         return true;
     }
     ts.rangeEquals = rangeEquals;
+    /**
+     * Returns the element at a specific offset in an array if non-empty, `undefined` otherwise.
+     * A negative offset indicates the element should be retrieved from the end of the array.
+     */
     function elementAt(array, offset) {
         if (array) {
             offset = toOffset(array, offset);
@@ -1067,6 +1017,9 @@ var ts;
         return undefined;
     }
     ts.elementAt = elementAt;
+    /**
+     * Returns the first element of an array if non-empty, `undefined` otherwise.
+     */
     function firstOrUndefined(array) {
         return array.length === 0 ? undefined : array[0];
     }
@@ -1076,6 +1029,9 @@ var ts;
         return array[0];
     }
     ts.first = first;
+    /**
+     * Returns the last element of an array if non-empty, `undefined` otherwise.
+     */
     function lastOrUndefined(array) {
         return array.length === 0 ? undefined : array[array.length - 1];
     }
@@ -1085,6 +1041,9 @@ var ts;
         return array[array.length - 1];
     }
     ts.last = last;
+    /**
+     * Returns the only element of an array if it contains only one element, `undefined` otherwise.
+     */
     function singleOrUndefined(array) {
         return array && array.length === 1
             ? array[0]
@@ -1103,6 +1062,17 @@ var ts;
         return result;
     }
     ts.replaceElement = replaceElement;
+    /**
+     * Performs a binary search, finding the index at which `value` occurs in `array`.
+     * If no such index is found, returns the 2's-complement of first index at which
+     * `array[index]` exceeds `value`.
+     * @param array A sorted array whose first element must be no larger than number
+     * @param value The value to be searched for in the array.
+     * @param keySelector A callback used to select the search key from `value` and each element of
+     * `array`.
+     * @param keyComparer A callback used to compare two keys in a sorted array.
+     * @param offset An offset into `array` at which to start the search.
+     */
     function binarySearch(array, value, keySelector, keyComparer, offset) {
         if (!array || array.length === 0) {
             return -1;
@@ -1114,12 +1084,12 @@ var ts;
             var middle = low + ((high - low) >> 1);
             var midKey = keySelector(array[middle]);
             switch (keyComparer(midKey, key)) {
-                case -1:
+                case -1 /* LessThan */:
                     low = middle + 1;
                     break;
-                case 0:
+                case 0 /* EqualTo */:
                     return middle;
-                case 1:
+                case 1 /* GreaterThan */:
                     high = middle - 1;
                     break;
             }
@@ -1152,14 +1122,29 @@ var ts;
     }
     ts.reduceLeft = reduceLeft;
     var hasOwnProperty = Object.prototype.hasOwnProperty;
+    /**
+     * Indicates whether a map-like contains an own property with the specified key.
+     *
+     * @param map A map-like.
+     * @param key A property key.
+     */
     function hasProperty(map, key) {
         return hasOwnProperty.call(map, key);
     }
     ts.hasProperty = hasProperty;
+    /**
+     * Gets the value of an owned property in a map-like.
+     *
+     * @param map A map-like.
+     * @param key A property key.
+     */
     function getProperty(map, key) {
         return hasOwnProperty.call(map, key) ? map[key] : undefined;
     }
     ts.getProperty = getProperty;
+    /**
+     * Gets the owned, enumerable property keys of a map-like.
+     */
     function getOwnKeys(map) {
         var keys = [];
         for (var key in map) {
@@ -1189,37 +1174,6 @@ var ts;
         return result;
     }
     ts.arrayFrom = arrayFrom;
-    function forEachEntry(map, callback) {
-        var _a;
-        var iterator = map.entries();
-        for (var _b = iterator.next(), pair = _b.value, done = _b.done; !done; _a = iterator.next(), pair = _a.value, done = _a.done, _a) {
-            var key = pair[0], value = pair[1];
-            var result = callback(value, key);
-            if (result) {
-                return result;
-            }
-        }
-        return undefined;
-    }
-    ts.forEachEntry = forEachEntry;
-    function forEachKey(map, callback) {
-        var _a;
-        var iterator = map.keys();
-        for (var _b = iterator.next(), key = _b.value, done = _b.done; !done; _a = iterator.next(), key = _a.value, done = _a.done, _a) {
-            var result = callback(key);
-            if (result) {
-                return result;
-            }
-        }
-        return undefined;
-    }
-    ts.forEachKey = forEachKey;
-    function copyEntries(source, target) {
-        source.forEach(function (value, key) {
-            target.set(key, value);
-        });
-    }
-    ts.copyEntries = copyEntries;
     function assign(t) {
         var args = [];
         for (var _i = 1; _i < arguments.length; _i++) {
@@ -1229,13 +1183,19 @@ var ts;
             var arg = args_1[_a];
             for (var p in arg) {
                 if (hasProperty(arg, p)) {
-                    t[p] = arg[p];
+                    t[p] = arg[p]; // TODO: GH#23368
                 }
             }
         }
         return t;
     }
     ts.assign = assign;
+    /**
+     * Performs a shallow equality comparison of the contents of two map-likes.
+     *
+     * @param left A map-like whose properties should be compared.
+     * @param right A map-like whose properties should be compared.
+     */
     function equalOwnProperties(left, right, equalityComparer) {
         if (equalityComparer === void 0) { equalityComparer = equateValues; }
         if (left === right)
@@ -1281,10 +1241,6 @@ var ts;
         return result;
     }
     ts.arrayToNumericMap = arrayToNumericMap;
-    function arrayToSet(array, makeKey) {
-        return arrayToMap(array, makeKey || (function (s) { return s; }), function () { return true; });
-    }
-    ts.arrayToSet = arrayToSet;
     function arrayToMultiMap(values, makeKey, makeValue) {
         if (makeValue === void 0) { makeValue = identity; }
         var result = createMultiMap();
@@ -1299,12 +1255,6 @@ var ts;
         return arrayFrom(arrayToMultiMap(values, getGroupId).values());
     }
     ts.group = group;
-    function cloneMap(map) {
-        var clone = createMap();
-        copyEntries(map, clone);
-        return clone;
-    }
-    ts.cloneMap = cloneMap;
     function clone(object) {
         var result = {};
         for (var id in object) {
@@ -1356,6 +1306,9 @@ var ts;
             }
         }
     }
+    /**
+     * Tests whether a value is an array.
+     */
     function isArray(value) {
         return Array.isArray ? Array.isArray(value) : value instanceof Array;
     }
@@ -1364,6 +1317,9 @@ var ts;
         return isArray(value) ? value : [value];
     }
     ts.toArray = toArray;
+    /**
+     * Tests whether a value is string
+     */
     function isString(text) {
         return typeof text === "string";
     }
@@ -1375,24 +1331,25 @@ var ts;
     function cast(value, test) {
         if (value !== undefined && test(value))
             return value;
-        if (value && typeof value.kind === "number") {
-            return Debug.fail("Invalid cast. The supplied " + Debug.showSyntaxKind(value) + " did not pass the test '" + Debug.getFunctionName(test) + "'.");
-        }
-        else {
-            return Debug.fail("Invalid cast. The supplied value did not pass the test '" + Debug.getFunctionName(test) + "'.");
-        }
+        return Debug.fail("Invalid cast. The supplied value " + value + " did not pass the test '" + Debug.getFunctionName(test) + "'.");
     }
     ts.cast = cast;
-    function noop(_) { }
+    /** Does nothing. */
+    function noop(_) { } // tslint:disable-line no-empty
     ts.noop = noop;
+    /** Do nothing and return false */
     function returnFalse() { return false; }
     ts.returnFalse = returnFalse;
+    /** Do nothing and return true */
     function returnTrue() { return true; }
     ts.returnTrue = returnTrue;
+    /** Returns its argument. */
     function identity(x) { return x; }
     ts.identity = identity;
+    /** Returns lower case string */
     function toLowerCase(x) { return x.toLowerCase(); }
     ts.toLowerCase = toLowerCase;
+    /** Throws an error because a function is not implemented. */
     function notImplemented() {
         throw new Error("Not implemented");
     }
@@ -1458,1110 +1415,16 @@ var ts;
         }
     }
     ts.compose = compose;
-    function formatStringFromArgs(text, args, baseIndex) {
-        if (baseIndex === void 0) { baseIndex = 0; }
-        return text.replace(/{(\d+)}/g, function (_match, index) { return Debug.assertDefined(args[+index + baseIndex]); });
-    }
-    ts.formatStringFromArgs = formatStringFromArgs;
-    function getLocaleSpecificMessage(message) {
-        return ts.localizedDiagnosticMessages && ts.localizedDiagnosticMessages[message.key] || message.message;
-    }
-    ts.getLocaleSpecificMessage = getLocaleSpecificMessage;
-    function createFileDiagnostic(file, start, length, message) {
-        Debug.assertGreaterThanOrEqual(start, 0);
-        Debug.assertGreaterThanOrEqual(length, 0);
-        if (file) {
-            Debug.assertLessThanOrEqual(start, file.text.length);
-            Debug.assertLessThanOrEqual(start + length, file.text.length);
-        }
-        var text = getLocaleSpecificMessage(message);
-        if (arguments.length > 4) {
-            text = formatStringFromArgs(text, arguments, 4);
-        }
-        return {
-            file: file,
-            start: start,
-            length: length,
-            messageText: text,
-            category: message.category,
-            code: message.code,
-            reportsUnnecessary: message.reportsUnnecessary,
-        };
-    }
-    ts.createFileDiagnostic = createFileDiagnostic;
-    function formatMessage(_dummy, message) {
-        var text = getLocaleSpecificMessage(message);
-        if (arguments.length > 2) {
-            text = formatStringFromArgs(text, arguments, 2);
-        }
-        return text;
-    }
-    ts.formatMessage = formatMessage;
-    function createCompilerDiagnostic(message) {
-        var text = getLocaleSpecificMessage(message);
-        if (arguments.length > 1) {
-            text = formatStringFromArgs(text, arguments, 1);
-        }
-        return {
-            file: undefined,
-            start: undefined,
-            length: undefined,
-            messageText: text,
-            category: message.category,
-            code: message.code,
-            reportsUnnecessary: message.reportsUnnecessary,
-        };
-    }
-    ts.createCompilerDiagnostic = createCompilerDiagnostic;
-    function createCompilerDiagnosticFromMessageChain(chain) {
-        return {
-            file: undefined,
-            start: undefined,
-            length: undefined,
-            code: chain.code,
-            category: chain.category,
-            messageText: chain.next ? chain : chain.messageText,
-        };
-    }
-    ts.createCompilerDiagnosticFromMessageChain = createCompilerDiagnosticFromMessageChain;
-    function chainDiagnosticMessages(details, message) {
-        var text = getLocaleSpecificMessage(message);
-        if (arguments.length > 2) {
-            text = formatStringFromArgs(text, arguments, 2);
-        }
-        return {
-            messageText: text,
-            category: message.category,
-            code: message.code,
-            next: details
-        };
-    }
-    ts.chainDiagnosticMessages = chainDiagnosticMessages;
-    function concatenateDiagnosticMessageChains(headChain, tailChain) {
-        var lastChain = headChain;
-        while (lastChain.next) {
-            lastChain = lastChain.next;
-        }
-        lastChain.next = tailChain;
-        return headChain;
-    }
-    ts.concatenateDiagnosticMessageChains = concatenateDiagnosticMessageChains;
-    function equateValues(a, b) {
-        return a === b;
-    }
-    ts.equateValues = equateValues;
-    function equateStringsCaseInsensitive(a, b) {
-        return a === b
-            || a !== undefined
-                && b !== undefined
-                && a.toUpperCase() === b.toUpperCase();
-    }
-    ts.equateStringsCaseInsensitive = equateStringsCaseInsensitive;
-    function equateStringsCaseSensitive(a, b) {
-        return equateValues(a, b);
-    }
-    ts.equateStringsCaseSensitive = equateStringsCaseSensitive;
-    function compareComparableValues(a, b) {
-        return a === b ? 0 :
-            a === undefined ? -1 :
-                b === undefined ? 1 :
-                    a < b ? -1 :
-                        1;
-    }
-    function compareValues(a, b) {
-        return compareComparableValues(a, b);
-    }
-    ts.compareValues = compareValues;
-    function min(a, b, compare) {
-        return compare(a, b) === -1 ? a : b;
-    }
-    ts.min = min;
-    function compareStringsCaseInsensitive(a, b) {
-        if (a === b)
-            return 0;
-        if (a === undefined)
-            return -1;
-        if (b === undefined)
-            return 1;
-        a = a.toUpperCase();
-        b = b.toUpperCase();
-        return a < b ? -1 : a > b ? 1 : 0;
-    }
-    ts.compareStringsCaseInsensitive = compareStringsCaseInsensitive;
-    function compareStringsCaseSensitive(a, b) {
-        return compareComparableValues(a, b);
-    }
-    ts.compareStringsCaseSensitive = compareStringsCaseSensitive;
-    function getStringComparer(ignoreCase) {
-        return ignoreCase ? compareStringsCaseInsensitive : compareStringsCaseSensitive;
-    }
-    ts.getStringComparer = getStringComparer;
-    var createUIStringComparer = (function () {
-        var defaultComparer;
-        var enUSComparer;
-        var stringComparerFactory = getStringComparerFactory();
-        return createStringComparer;
-        function compareWithCallback(a, b, comparer) {
-            if (a === b)
-                return 0;
-            if (a === undefined)
-                return -1;
-            if (b === undefined)
-                return 1;
-            var value = comparer(a, b);
-            return value < 0 ? -1 : value > 0 ? 1 : 0;
-        }
-        function createIntlCollatorStringComparer(locale) {
-            var comparer = new Intl.Collator(locale, { usage: "sort", sensitivity: "variant" }).compare;
-            return function (a, b) { return compareWithCallback(a, b, comparer); };
-        }
-        function createLocaleCompareStringComparer(locale) {
-            if (locale !== undefined)
-                return createFallbackStringComparer();
-            return function (a, b) { return compareWithCallback(a, b, compareStrings); };
-            function compareStrings(a, b) {
-                return a.localeCompare(b);
-            }
-        }
-        function createFallbackStringComparer() {
-            return function (a, b) { return compareWithCallback(a, b, compareDictionaryOrder); };
-            function compareDictionaryOrder(a, b) {
-                return compareStrings(a.toUpperCase(), b.toUpperCase()) || compareStrings(a, b);
-            }
-            function compareStrings(a, b) {
-                return a < b ? -1 : a > b ? 1 : 0;
-            }
-        }
-        function getStringComparerFactory() {
-            if (typeof Intl === "object" && typeof Intl.Collator === "function") {
-                return createIntlCollatorStringComparer;
-            }
-            if (typeof String.prototype.localeCompare === "function" &&
-                typeof String.prototype.toLocaleUpperCase === "function" &&
-                "a".localeCompare("B") < 0) {
-                return createLocaleCompareStringComparer;
-            }
-            return createFallbackStringComparer;
-        }
-        function createStringComparer(locale) {
-            if (locale === undefined) {
-                return defaultComparer || (defaultComparer = stringComparerFactory(locale));
-            }
-            else if (locale === "en-US") {
-                return enUSComparer || (enUSComparer = stringComparerFactory(locale));
-            }
-            else {
-                return stringComparerFactory(locale);
-            }
-        }
-    })();
-    var uiComparerCaseSensitive;
-    var uiLocale;
-    function getUILocale() {
-        return uiLocale;
-    }
-    ts.getUILocale = getUILocale;
-    function setUILocale(value) {
-        if (uiLocale !== value) {
-            uiLocale = value;
-            uiComparerCaseSensitive = undefined;
-        }
-    }
-    ts.setUILocale = setUILocale;
-    function compareStringsCaseSensitiveUI(a, b) {
-        var comparer = uiComparerCaseSensitive || (uiComparerCaseSensitive = createUIStringComparer(uiLocale));
-        return comparer(a, b);
-    }
-    ts.compareStringsCaseSensitiveUI = compareStringsCaseSensitiveUI;
-    function compareProperties(a, b, key, comparer) {
-        return a === b ? 0 :
-            a === undefined ? -1 :
-                b === undefined ? 1 :
-                    comparer(a[key], b[key]);
-    }
-    ts.compareProperties = compareProperties;
-    function getDiagnosticFilePath(diagnostic) {
-        return diagnostic.file ? diagnostic.file.path : undefined;
-    }
-    function compareDiagnostics(d1, d2) {
-        return compareStringsCaseSensitive(getDiagnosticFilePath(d1), getDiagnosticFilePath(d2)) ||
-            compareValues(d1.start, d2.start) ||
-            compareValues(d1.length, d2.length) ||
-            compareValues(d1.code, d2.code) ||
-            compareMessageText(d1.messageText, d2.messageText) ||
-            0;
-    }
-    ts.compareDiagnostics = compareDiagnostics;
-    function compareBooleans(a, b) {
-        return compareValues(a ? 1 : 0, b ? 1 : 0);
-    }
-    ts.compareBooleans = compareBooleans;
-    function compareMessageText(t1, t2) {
-        var text1 = t1;
-        var text2 = t2;
-        while (text1 && text2) {
-            var string1 = isString(text1) ? text1 : text1.messageText;
-            var string2 = isString(text2) ? text2 : text2.messageText;
-            var res = compareStringsCaseSensitive(string1, string2);
-            if (res) {
-                return res;
-            }
-            text1 = isString(text1) ? undefined : text1.next;
-            text2 = isString(text2) ? undefined : text2.next;
-        }
-        if (!text1 && !text2) {
-            return 0;
-        }
-        return text1 ? 1 : -1;
-    }
-    function getEmitScriptTarget(compilerOptions) {
-        return compilerOptions.target || 0;
-    }
-    ts.getEmitScriptTarget = getEmitScriptTarget;
-    function getEmitModuleKind(compilerOptions) {
-        return typeof compilerOptions.module === "number" ?
-            compilerOptions.module :
-            getEmitScriptTarget(compilerOptions) >= 2 ? ts.ModuleKind.ES2015 : ts.ModuleKind.CommonJS;
-    }
-    ts.getEmitModuleKind = getEmitModuleKind;
-    function getEmitModuleResolutionKind(compilerOptions) {
-        var moduleResolution = compilerOptions.moduleResolution;
-        if (moduleResolution === undefined) {
-            moduleResolution = getEmitModuleKind(compilerOptions) === ts.ModuleKind.CommonJS ? ts.ModuleResolutionKind.NodeJs : ts.ModuleResolutionKind.Classic;
-        }
-        return moduleResolution;
-    }
-    ts.getEmitModuleResolutionKind = getEmitModuleResolutionKind;
-    function unreachableCodeIsError(options) {
-        return options.allowUnreachableCode === false;
-    }
-    ts.unreachableCodeIsError = unreachableCodeIsError;
-    function unusedLabelIsError(options) {
-        return options.allowUnusedLabels === false;
-    }
-    ts.unusedLabelIsError = unusedLabelIsError;
-    function getAreDeclarationMapsEnabled(options) {
-        return !!(options.declaration && options.declarationMap);
-    }
-    ts.getAreDeclarationMapsEnabled = getAreDeclarationMapsEnabled;
-    function getAllowSyntheticDefaultImports(compilerOptions) {
-        var moduleKind = getEmitModuleKind(compilerOptions);
-        return compilerOptions.allowSyntheticDefaultImports !== undefined
-            ? compilerOptions.allowSyntheticDefaultImports
-            : compilerOptions.esModuleInterop
-                ? moduleKind !== ts.ModuleKind.None && moduleKind < ts.ModuleKind.ES2015
-                : moduleKind === ts.ModuleKind.System;
-    }
-    ts.getAllowSyntheticDefaultImports = getAllowSyntheticDefaultImports;
-    function getEmitDeclarations(compilerOptions) {
-        return !!(compilerOptions.declaration || compilerOptions.composite);
-    }
-    ts.getEmitDeclarations = getEmitDeclarations;
-    function getStrictOptionValue(compilerOptions, flag) {
-        return compilerOptions[flag] === undefined ? !!compilerOptions.strict : !!compilerOptions[flag];
-    }
-    ts.getStrictOptionValue = getStrictOptionValue;
-    function hasZeroOrOneAsteriskCharacter(str) {
-        var seenAsterisk = false;
-        for (var i = 0; i < str.length; i++) {
-            if (str.charCodeAt(i) === 42) {
-                if (!seenAsterisk) {
-                    seenAsterisk = true;
-                }
-                else {
-                    return false;
-                }
-            }
-        }
-        return true;
-    }
-    ts.hasZeroOrOneAsteriskCharacter = hasZeroOrOneAsteriskCharacter;
-    ts.directorySeparator = "/";
-    var altDirectorySeparator = "\\";
-    var urlSchemeSeparator = "://";
-    var backslashRegExp = /\\/g;
-    function normalizeSlashes(path) {
-        return path.replace(backslashRegExp, ts.directorySeparator);
-    }
-    ts.normalizeSlashes = normalizeSlashes;
-    function isVolumeCharacter(charCode) {
-        return (charCode >= 97 && charCode <= 122) ||
-            (charCode >= 65 && charCode <= 90);
-    }
-    function getFileUrlVolumeSeparatorEnd(url, start) {
-        var ch0 = url.charCodeAt(start);
-        if (ch0 === 58)
-            return start + 1;
-        if (ch0 === 37 && url.charCodeAt(start + 1) === 51) {
-            var ch2 = url.charCodeAt(start + 2);
-            if (ch2 === 97 || ch2 === 65)
-                return start + 3;
-        }
-        return -1;
-    }
-    function getEncodedRootLength(path) {
-        if (!path)
-            return 0;
-        var ch0 = path.charCodeAt(0);
-        if (ch0 === 47 || ch0 === 92) {
-            if (path.charCodeAt(1) !== ch0)
-                return 1;
-            var p1 = path.indexOf(ch0 === 47 ? ts.directorySeparator : altDirectorySeparator, 2);
-            if (p1 < 0)
-                return path.length;
-            return p1 + 1;
-        }
-        if (isVolumeCharacter(ch0) && path.charCodeAt(1) === 58) {
-            var ch2 = path.charCodeAt(2);
-            if (ch2 === 47 || ch2 === 92)
-                return 3;
-            if (path.length === 2)
-                return 2;
-        }
-        var schemeEnd = path.indexOf(urlSchemeSeparator);
-        if (schemeEnd !== -1) {
-            var authorityStart = schemeEnd + urlSchemeSeparator.length;
-            var authorityEnd = path.indexOf(ts.directorySeparator, authorityStart);
-            if (authorityEnd !== -1) {
-                var scheme = path.slice(0, schemeEnd);
-                var authority = path.slice(authorityStart, authorityEnd);
-                if (scheme === "file" && (authority === "" || authority === "localhost") &&
-                    isVolumeCharacter(path.charCodeAt(authorityEnd + 1))) {
-                    var volumeSeparatorEnd = getFileUrlVolumeSeparatorEnd(path, authorityEnd + 2);
-                    if (volumeSeparatorEnd !== -1) {
-                        if (path.charCodeAt(volumeSeparatorEnd) === 47) {
-                            return ~(volumeSeparatorEnd + 1);
-                        }
-                        if (volumeSeparatorEnd === path.length) {
-                            return ~volumeSeparatorEnd;
-                        }
-                    }
-                }
-                return ~(authorityEnd + 1);
-            }
-            return ~path.length;
-        }
-        return 0;
-    }
-    function getRootLength(path) {
-        var rootLength = getEncodedRootLength(path);
-        return rootLength < 0 ? ~rootLength : rootLength;
-    }
-    ts.getRootLength = getRootLength;
-    function normalizePath(path) {
-        return resolvePath(path);
-    }
-    ts.normalizePath = normalizePath;
-    function normalizePathAndParts(path) {
-        path = normalizeSlashes(path);
-        var _a = reducePathComponents(getPathComponents(path)), root = _a[0], parts = _a.slice(1);
-        if (parts.length) {
-            var joinedParts = root + parts.join(ts.directorySeparator);
-            return { path: hasTrailingDirectorySeparator(path) ? ensureTrailingDirectorySeparator(joinedParts) : joinedParts, parts: parts };
-        }
-        else {
-            return { path: root, parts: parts };
-        }
-    }
-    ts.normalizePathAndParts = normalizePathAndParts;
-    function getDirectoryPath(path) {
-        path = normalizeSlashes(path);
-        var rootLength = getRootLength(path);
-        if (rootLength === path.length)
-            return path;
-        path = removeTrailingDirectorySeparator(path);
-        return path.slice(0, Math.max(rootLength, path.lastIndexOf(ts.directorySeparator)));
-    }
-    ts.getDirectoryPath = getDirectoryPath;
-    function isUrl(path) {
-        return getEncodedRootLength(path) < 0;
-    }
-    ts.isUrl = isUrl;
-    function pathIsRelative(path) {
-        return /^\.\.?($|[\\/])/.test(path);
-    }
-    ts.pathIsRelative = pathIsRelative;
-    function isRootedDiskPath(path) {
-        return getEncodedRootLength(path) > 0;
-    }
-    ts.isRootedDiskPath = isRootedDiskPath;
-    function isDiskPathRoot(path) {
-        var rootLength = getEncodedRootLength(path);
-        return rootLength > 0 && rootLength === path.length;
-    }
-    ts.isDiskPathRoot = isDiskPathRoot;
-    function convertToRelativePath(absoluteOrRelativePath, basePath, getCanonicalFileName) {
-        return !isRootedDiskPath(absoluteOrRelativePath)
-            ? absoluteOrRelativePath
-            : getRelativePathToDirectoryOrUrl(basePath, absoluteOrRelativePath, basePath, getCanonicalFileName, false);
-    }
-    ts.convertToRelativePath = convertToRelativePath;
-    function pathComponents(path, rootLength) {
-        var root = path.substring(0, rootLength);
-        var rest = path.substring(rootLength).split(ts.directorySeparator);
-        if (rest.length && !lastOrUndefined(rest))
-            rest.pop();
-        return [root].concat(rest);
-    }
-    function getPathComponents(path, currentDirectory) {
-        if (currentDirectory === void 0) { currentDirectory = ""; }
-        path = combinePaths(currentDirectory, path);
-        var rootLength = getRootLength(path);
-        return pathComponents(path, rootLength);
-    }
-    ts.getPathComponents = getPathComponents;
-    function reducePathComponents(components) {
-        if (!some(components))
-            return [];
-        var reduced = [components[0]];
-        for (var i = 1; i < components.length; i++) {
-            var component = components[i];
-            if (!component)
-                continue;
-            if (component === ".")
-                continue;
-            if (component === "..") {
-                if (reduced.length > 1) {
-                    if (reduced[reduced.length - 1] !== "..") {
-                        reduced.pop();
-                        continue;
-                    }
-                }
-                else if (reduced[0])
-                    continue;
-            }
-            reduced.push(component);
-        }
-        return reduced;
-    }
-    ts.reducePathComponents = reducePathComponents;
-    function getNormalizedPathComponents(path, currentDirectory) {
-        return reducePathComponents(getPathComponents(path, currentDirectory));
-    }
-    ts.getNormalizedPathComponents = getNormalizedPathComponents;
-    function getNormalizedAbsolutePath(fileName, currentDirectory) {
-        return getPathFromPathComponents(getNormalizedPathComponents(fileName, currentDirectory));
-    }
-    ts.getNormalizedAbsolutePath = getNormalizedAbsolutePath;
-    function getPathFromPathComponents(pathComponents) {
-        if (pathComponents.length === 0)
-            return "";
-        var root = pathComponents[0] && ensureTrailingDirectorySeparator(pathComponents[0]);
-        if (pathComponents.length === 1)
-            return root;
-        return root + pathComponents.slice(1).join(ts.directorySeparator);
-    }
-    ts.getPathFromPathComponents = getPathFromPathComponents;
-    function getPathComponentsRelativeTo(from, to, stringEqualityComparer, getCanonicalFileName) {
-        var fromComponents = reducePathComponents(getPathComponents(from));
-        var toComponents = reducePathComponents(getPathComponents(to));
-        var start;
-        for (start = 0; start < fromComponents.length && start < toComponents.length; start++) {
-            var fromComponent = getCanonicalFileName(fromComponents[start]);
-            var toComponent = getCanonicalFileName(toComponents[start]);
-            var comparer = start === 0 ? equateStringsCaseInsensitive : stringEqualityComparer;
-            if (!comparer(fromComponent, toComponent))
-                break;
-        }
-        if (start === 0) {
-            return toComponents;
-        }
-        var components = toComponents.slice(start);
-        var relative = [];
-        for (; start < fromComponents.length; start++) {
-            relative.push("..");
-        }
-        return [""].concat(relative, components);
-    }
-    function getRelativePathFromFile(from, to, getCanonicalFileName) {
-        return ensurePathIsNonModuleName(getRelativePathFromDirectory(getDirectoryPath(from), to, getCanonicalFileName));
-    }
-    ts.getRelativePathFromFile = getRelativePathFromFile;
-    function getRelativePathFromDirectory(fromDirectory, to, getCanonicalFileNameOrIgnoreCase) {
-        Debug.assert((getRootLength(fromDirectory) > 0) === (getRootLength(to) > 0), "Paths must either both be absolute or both be relative");
-        var getCanonicalFileName = typeof getCanonicalFileNameOrIgnoreCase === "function" ? getCanonicalFileNameOrIgnoreCase : identity;
-        var ignoreCase = typeof getCanonicalFileNameOrIgnoreCase === "boolean" ? getCanonicalFileNameOrIgnoreCase : false;
-        var pathComponents = getPathComponentsRelativeTo(fromDirectory, to, ignoreCase ? equateStringsCaseInsensitive : equateStringsCaseSensitive, getCanonicalFileName);
-        return getPathFromPathComponents(pathComponents);
-    }
-    ts.getRelativePathFromDirectory = getRelativePathFromDirectory;
-    function getRelativePathToDirectoryOrUrl(directoryPathOrUrl, relativeOrAbsolutePath, currentDirectory, getCanonicalFileName, isAbsolutePathAnUrl) {
-        var pathComponents = getPathComponentsRelativeTo(resolvePath(currentDirectory, directoryPathOrUrl), resolvePath(currentDirectory, relativeOrAbsolutePath), equateStringsCaseSensitive, getCanonicalFileName);
-        var firstComponent = pathComponents[0];
-        if (isAbsolutePathAnUrl && isRootedDiskPath(firstComponent)) {
-            var prefix = firstComponent.charAt(0) === ts.directorySeparator ? "file://" : "file:///";
-            pathComponents[0] = prefix + firstComponent;
-        }
-        return getPathFromPathComponents(pathComponents);
-    }
-    ts.getRelativePathToDirectoryOrUrl = getRelativePathToDirectoryOrUrl;
-    function ensurePathIsNonModuleName(path) {
-        return getRootLength(path) === 0 && !pathIsRelative(path) ? "./" + path : path;
-    }
-    ts.ensurePathIsNonModuleName = ensurePathIsNonModuleName;
-    function getBaseFileName(path, extensions, ignoreCase) {
-        path = normalizeSlashes(path);
-        var rootLength = getRootLength(path);
-        if (rootLength === path.length)
-            return "";
-        path = removeTrailingDirectorySeparator(path);
-        var name = path.slice(Math.max(getRootLength(path), path.lastIndexOf(ts.directorySeparator) + 1));
-        var extension = extensions !== undefined && ignoreCase !== undefined ? getAnyExtensionFromPath(name, extensions, ignoreCase) : undefined;
-        return extension ? name.slice(0, name.length - extension.length) : name;
-    }
-    ts.getBaseFileName = getBaseFileName;
-    function combinePaths(path) {
-        var paths = [];
-        for (var _i = 1; _i < arguments.length; _i++) {
-            paths[_i - 1] = arguments[_i];
-        }
-        if (path)
-            path = normalizeSlashes(path);
-        for (var _a = 0, paths_1 = paths; _a < paths_1.length; _a++) {
-            var relativePath = paths_1[_a];
-            if (!relativePath)
-                continue;
-            relativePath = normalizeSlashes(relativePath);
-            if (!path || getRootLength(relativePath) !== 0) {
-                path = relativePath;
-            }
-            else {
-                path = ensureTrailingDirectorySeparator(path) + relativePath;
-            }
-        }
-        return path;
-    }
-    ts.combinePaths = combinePaths;
-    function resolvePath(path) {
-        var paths = [];
-        for (var _i = 1; _i < arguments.length; _i++) {
-            paths[_i - 1] = arguments[_i];
-        }
-        var combined = some(paths) ? combinePaths.apply(void 0, [path].concat(paths)) : normalizeSlashes(path);
-        var normalized = getPathFromPathComponents(reducePathComponents(getPathComponents(combined)));
-        return normalized && hasTrailingDirectorySeparator(combined) ? ensureTrailingDirectorySeparator(normalized) : normalized;
-    }
-    ts.resolvePath = resolvePath;
-    function hasTrailingDirectorySeparator(path) {
-        if (path.length === 0)
-            return false;
-        var ch = path.charCodeAt(path.length - 1);
-        return ch === 47 || ch === 92;
-    }
-    ts.hasTrailingDirectorySeparator = hasTrailingDirectorySeparator;
-    function removeTrailingDirectorySeparator(path) {
-        if (hasTrailingDirectorySeparator(path)) {
-            return path.substr(0, path.length - 1);
-        }
-        return path;
-    }
-    ts.removeTrailingDirectorySeparator = removeTrailingDirectorySeparator;
-    function ensureTrailingDirectorySeparator(path) {
-        if (!hasTrailingDirectorySeparator(path)) {
-            return path + ts.directorySeparator;
-        }
-        return path;
-    }
-    ts.ensureTrailingDirectorySeparator = ensureTrailingDirectorySeparator;
-    function comparePathsWorker(a, b, componentComparer) {
-        if (a === b)
-            return 0;
-        if (a === undefined)
-            return -1;
-        if (b === undefined)
-            return 1;
-        var aComponents = reducePathComponents(getPathComponents(a));
-        var bComponents = reducePathComponents(getPathComponents(b));
-        var sharedLength = Math.min(aComponents.length, bComponents.length);
-        for (var i = 0; i < sharedLength; i++) {
-            var stringComparer = i === 0 ? compareStringsCaseInsensitive : componentComparer;
-            var result = stringComparer(aComponents[i], bComponents[i]);
-            if (result !== 0) {
-                return result;
-            }
-        }
-        return compareValues(aComponents.length, bComponents.length);
-    }
-    function comparePathsCaseSensitive(a, b) {
-        return comparePathsWorker(a, b, compareStringsCaseSensitive);
-    }
-    ts.comparePathsCaseSensitive = comparePathsCaseSensitive;
-    function comparePathsCaseInsensitive(a, b) {
-        return comparePathsWorker(a, b, compareStringsCaseInsensitive);
-    }
-    ts.comparePathsCaseInsensitive = comparePathsCaseInsensitive;
-    function comparePaths(a, b, currentDirectory, ignoreCase) {
-        if (typeof currentDirectory === "string") {
-            a = combinePaths(currentDirectory, a);
-            b = combinePaths(currentDirectory, b);
-        }
-        else if (typeof currentDirectory === "boolean") {
-            ignoreCase = currentDirectory;
-        }
-        return comparePathsWorker(a, b, getStringComparer(ignoreCase));
-    }
-    ts.comparePaths = comparePaths;
-    function containsPath(parent, child, currentDirectory, ignoreCase) {
-        if (typeof currentDirectory === "string") {
-            parent = combinePaths(currentDirectory, parent);
-            child = combinePaths(currentDirectory, child);
-        }
-        else if (typeof currentDirectory === "boolean") {
-            ignoreCase = currentDirectory;
-        }
-        if (parent === undefined || child === undefined)
-            return false;
-        if (parent === child)
-            return true;
-        var parentComponents = reducePathComponents(getPathComponents(parent));
-        var childComponents = reducePathComponents(getPathComponents(child));
-        if (childComponents.length < parentComponents.length) {
-            return false;
-        }
-        var componentEqualityComparer = ignoreCase ? equateStringsCaseInsensitive : equateStringsCaseSensitive;
-        for (var i = 0; i < parentComponents.length; i++) {
-            var equalityComparer = i === 0 ? equateStringsCaseInsensitive : componentEqualityComparer;
-            if (!equalityComparer(parentComponents[i], childComponents[i])) {
-                return false;
-            }
-        }
-        return true;
-    }
-    ts.containsPath = containsPath;
-    function startsWith(str, prefix) {
-        return str.lastIndexOf(prefix, 0) === 0;
-    }
-    ts.startsWith = startsWith;
-    function removePrefix(str, prefix) {
-        return startsWith(str, prefix) ? str.substr(prefix.length) : str;
-    }
-    ts.removePrefix = removePrefix;
-    function tryRemovePrefix(str, prefix) {
-        return startsWith(str, prefix) ? str.substring(prefix.length) : undefined;
-    }
-    ts.tryRemovePrefix = tryRemovePrefix;
-    function tryRemoveDirectoryPrefix(path, dirPath) {
-        var a = tryRemovePrefix(path, dirPath);
-        if (a === undefined)
-            return undefined;
-        switch (a.charCodeAt(0)) {
-            case 47:
-            case 92:
-                return a.slice(1);
-            default:
-                return undefined;
-        }
-    }
-    ts.tryRemoveDirectoryPrefix = tryRemoveDirectoryPrefix;
-    function endsWith(str, suffix) {
-        var expectedPos = str.length - suffix.length;
-        return expectedPos >= 0 && str.indexOf(suffix, expectedPos) === expectedPos;
-    }
-    ts.endsWith = endsWith;
-    function removeSuffix(str, suffix) {
-        return endsWith(str, suffix) ? str.slice(0, str.length - suffix.length) : str;
-    }
-    ts.removeSuffix = removeSuffix;
-    function tryRemoveSuffix(str, suffix) {
-        return endsWith(str, suffix) ? str.slice(0, str.length - suffix.length) : undefined;
-    }
-    ts.tryRemoveSuffix = tryRemoveSuffix;
-    function stringContains(str, substring) {
-        return str.indexOf(substring) !== -1;
-    }
-    ts.stringContains = stringContains;
-    function hasExtension(fileName) {
-        return stringContains(getBaseFileName(fileName), ".");
-    }
-    ts.hasExtension = hasExtension;
-    function fileExtensionIs(path, extension) {
-        return path.length > extension.length && endsWith(path, extension);
-    }
-    ts.fileExtensionIs = fileExtensionIs;
-    function fileExtensionIsOneOf(path, extensions) {
-        for (var _i = 0, extensions_1 = extensions; _i < extensions_1.length; _i++) {
-            var extension = extensions_1[_i];
-            if (fileExtensionIs(path, extension)) {
-                return true;
-            }
-        }
-        return false;
-    }
-    ts.fileExtensionIsOneOf = fileExtensionIsOneOf;
-    var reservedCharacterPattern = /[^\w\s\/]/g;
-    var wildcardCharCodes = [42, 63];
-    ts.commonPackageFolders = ["node_modules", "bower_components", "jspm_packages"];
-    var implicitExcludePathRegexPattern = "(?!(" + ts.commonPackageFolders.join("|") + ")(/|$))";
-    var filesMatcher = {
-        singleAsteriskRegexFragment: "([^./]|(\\.(?!min\\.js$))?)*",
-        doubleAsteriskRegexFragment: "(/" + implicitExcludePathRegexPattern + "[^/.][^/]*)*?",
-        replaceWildcardCharacter: function (match) { return replaceWildcardCharacter(match, filesMatcher.singleAsteriskRegexFragment); }
-    };
-    var directoriesMatcher = {
-        singleAsteriskRegexFragment: "[^/]*",
-        doubleAsteriskRegexFragment: "(/" + implicitExcludePathRegexPattern + "[^/.][^/]*)*?",
-        replaceWildcardCharacter: function (match) { return replaceWildcardCharacter(match, directoriesMatcher.singleAsteriskRegexFragment); }
-    };
-    var excludeMatcher = {
-        singleAsteriskRegexFragment: "[^/]*",
-        doubleAsteriskRegexFragment: "(/.+?)?",
-        replaceWildcardCharacter: function (match) { return replaceWildcardCharacter(match, excludeMatcher.singleAsteriskRegexFragment); }
-    };
-    var wildcardMatchers = {
-        files: filesMatcher,
-        directories: directoriesMatcher,
-        exclude: excludeMatcher
-    };
-    function getRegularExpressionForWildcard(specs, basePath, usage) {
-        var patterns = getRegularExpressionsForWildcards(specs, basePath, usage);
-        if (!patterns || !patterns.length) {
-            return undefined;
-        }
-        var pattern = patterns.map(function (pattern) { return "(" + pattern + ")"; }).join("|");
-        var terminator = usage === "exclude" ? "($|/)" : "$";
-        return "^(" + pattern + ")" + terminator;
-    }
-    ts.getRegularExpressionForWildcard = getRegularExpressionForWildcard;
-    function getRegularExpressionsForWildcards(specs, basePath, usage) {
-        if (specs === undefined || specs.length === 0) {
-            return undefined;
-        }
-        return flatMap(specs, function (spec) {
-            return spec && getSubPatternFromSpec(spec, basePath, usage, wildcardMatchers[usage]);
-        });
-    }
-    function isImplicitGlob(lastPathComponent) {
-        return !/[.*?]/.test(lastPathComponent);
-    }
-    ts.isImplicitGlob = isImplicitGlob;
-    function getSubPatternFromSpec(spec, basePath, usage, _a) {
-        var singleAsteriskRegexFragment = _a.singleAsteriskRegexFragment, doubleAsteriskRegexFragment = _a.doubleAsteriskRegexFragment, replaceWildcardCharacter = _a.replaceWildcardCharacter;
-        var subpattern = "";
-        var hasWrittenComponent = false;
-        var components = getNormalizedPathComponents(spec, basePath);
-        var lastComponent = last(components);
-        if (usage !== "exclude" && lastComponent === "**") {
-            return undefined;
-        }
-        components[0] = removeTrailingDirectorySeparator(components[0]);
-        if (isImplicitGlob(lastComponent)) {
-            components.push("**", "*");
-        }
-        var optionalCount = 0;
-        for (var _i = 0, components_1 = components; _i < components_1.length; _i++) {
-            var component = components_1[_i];
-            if (component === "**") {
-                subpattern += doubleAsteriskRegexFragment;
-            }
-            else {
-                if (usage === "directories") {
-                    subpattern += "(";
-                    optionalCount++;
-                }
-                if (hasWrittenComponent) {
-                    subpattern += ts.directorySeparator;
-                }
-                if (usage !== "exclude") {
-                    var componentPattern = "";
-                    if (component.charCodeAt(0) === 42) {
-                        componentPattern += "([^./]" + singleAsteriskRegexFragment + ")?";
-                        component = component.substr(1);
-                    }
-                    else if (component.charCodeAt(0) === 63) {
-                        componentPattern += "[^./]";
-                        component = component.substr(1);
-                    }
-                    componentPattern += component.replace(reservedCharacterPattern, replaceWildcardCharacter);
-                    if (componentPattern !== component) {
-                        subpattern += implicitExcludePathRegexPattern;
-                    }
-                    subpattern += componentPattern;
-                }
-                else {
-                    subpattern += component.replace(reservedCharacterPattern, replaceWildcardCharacter);
-                }
-            }
-            hasWrittenComponent = true;
-        }
-        while (optionalCount > 0) {
-            subpattern += ")?";
-            optionalCount--;
-        }
-        return subpattern;
-    }
-    function replaceWildcardCharacter(match, singleAsteriskRegexFragment) {
-        return match === "*" ? singleAsteriskRegexFragment : match === "?" ? "[^/]" : "\\" + match;
-    }
-    function getFileMatcherPatterns(path, excludes, includes, useCaseSensitiveFileNames, currentDirectory) {
-        path = normalizePath(path);
-        currentDirectory = normalizePath(currentDirectory);
-        var absolutePath = combinePaths(currentDirectory, path);
-        return {
-            includeFilePatterns: map(getRegularExpressionsForWildcards(includes, absolutePath, "files"), function (pattern) { return "^" + pattern + "$"; }),
-            includeFilePattern: getRegularExpressionForWildcard(includes, absolutePath, "files"),
-            includeDirectoryPattern: getRegularExpressionForWildcard(includes, absolutePath, "directories"),
-            excludePattern: getRegularExpressionForWildcard(excludes, absolutePath, "exclude"),
-            basePaths: getBasePaths(path, includes, useCaseSensitiveFileNames)
-        };
-    }
-    ts.getFileMatcherPatterns = getFileMatcherPatterns;
-    function getRegexFromPattern(pattern, useCaseSensitiveFileNames) {
-        return new RegExp(pattern, useCaseSensitiveFileNames ? "" : "i");
-    }
-    ts.getRegexFromPattern = getRegexFromPattern;
-    function matchFiles(path, extensions, excludes, includes, useCaseSensitiveFileNames, currentDirectory, depth, getFileSystemEntries) {
-        path = normalizePath(path);
-        currentDirectory = normalizePath(currentDirectory);
-        var patterns = getFileMatcherPatterns(path, excludes, includes, useCaseSensitiveFileNames, currentDirectory);
-        var includeFileRegexes = patterns.includeFilePatterns && patterns.includeFilePatterns.map(function (pattern) { return getRegexFromPattern(pattern, useCaseSensitiveFileNames); });
-        var includeDirectoryRegex = patterns.includeDirectoryPattern && getRegexFromPattern(patterns.includeDirectoryPattern, useCaseSensitiveFileNames);
-        var excludeRegex = patterns.excludePattern && getRegexFromPattern(patterns.excludePattern, useCaseSensitiveFileNames);
-        var results = includeFileRegexes ? includeFileRegexes.map(function () { return []; }) : [[]];
-        for (var _i = 0, _a = patterns.basePaths; _i < _a.length; _i++) {
-            var basePath = _a[_i];
-            visitDirectory(basePath, combinePaths(currentDirectory, basePath), depth);
-        }
-        return flatten(results);
-        function visitDirectory(path, absolutePath, depth) {
-            var _a = getFileSystemEntries(path), files = _a.files, directories = _a.directories;
-            var _loop_1 = function (current) {
-                var name = combinePaths(path, current);
-                var absoluteName = combinePaths(absolutePath, current);
-                if (extensions && !fileExtensionIsOneOf(name, extensions))
-                    return "continue";
-                if (excludeRegex && excludeRegex.test(absoluteName))
-                    return "continue";
-                if (!includeFileRegexes) {
-                    results[0].push(name);
-                }
-                else {
-                    var includeIndex = findIndex(includeFileRegexes, function (re) { return re.test(absoluteName); });
-                    if (includeIndex !== -1) {
-                        results[includeIndex].push(name);
-                    }
-                }
-            };
-            for (var _i = 0, _b = sort(files, compareStringsCaseSensitive); _i < _b.length; _i++) {
-                var current = _b[_i];
-                _loop_1(current);
-            }
-            if (depth !== undefined) {
-                depth--;
-                if (depth === 0) {
-                    return;
-                }
-            }
-            for (var _c = 0, _d = sort(directories, compareStringsCaseSensitive); _c < _d.length; _c++) {
-                var current = _d[_c];
-                var name = combinePaths(path, current);
-                var absoluteName = combinePaths(absolutePath, current);
-                if ((!includeDirectoryRegex || includeDirectoryRegex.test(absoluteName)) &&
-                    (!excludeRegex || !excludeRegex.test(absoluteName))) {
-                    visitDirectory(name, absoluteName, depth);
-                }
-            }
-        }
-    }
-    ts.matchFiles = matchFiles;
-    function getBasePaths(path, includes, useCaseSensitiveFileNames) {
-        var basePaths = [path];
-        if (includes) {
-            var includeBasePaths = [];
-            for (var _i = 0, includes_1 = includes; _i < includes_1.length; _i++) {
-                var include = includes_1[_i];
-                var absolute = isRootedDiskPath(include) ? include : normalizePath(combinePaths(path, include));
-                includeBasePaths.push(getIncludeBasePath(absolute));
-            }
-            includeBasePaths.sort(getStringComparer(!useCaseSensitiveFileNames));
-            var _loop_2 = function (includeBasePath) {
-                if (every(basePaths, function (basePath) { return !containsPath(basePath, includeBasePath, path, !useCaseSensitiveFileNames); })) {
-                    basePaths.push(includeBasePath);
-                }
-            };
-            for (var _a = 0, includeBasePaths_1 = includeBasePaths; _a < includeBasePaths_1.length; _a++) {
-                var includeBasePath = includeBasePaths_1[_a];
-                _loop_2(includeBasePath);
-            }
-        }
-        return basePaths;
-    }
-    function getIncludeBasePath(absolute) {
-        var wildcardOffset = indexOfAnyCharCode(absolute, wildcardCharCodes);
-        if (wildcardOffset < 0) {
-            return !hasExtension(absolute)
-                ? absolute
-                : removeTrailingDirectorySeparator(getDirectoryPath(absolute));
-        }
-        return absolute.substring(0, absolute.lastIndexOf(ts.directorySeparator, wildcardOffset));
-    }
-    function ensureScriptKind(fileName, scriptKind) {
-        return scriptKind || getScriptKindFromFileName(fileName) || 3;
-    }
-    ts.ensureScriptKind = ensureScriptKind;
-    function getScriptKindFromFileName(fileName) {
-        var ext = fileName.substr(fileName.lastIndexOf("."));
-        switch (ext.toLowerCase()) {
-            case ".js":
-                return 1;
-            case ".jsx":
-                return 2;
-            case ".ts":
-                return 3;
-            case ".tsx":
-                return 4;
-            case ".json":
-                return 6;
-            default:
-                return 0;
-        }
-    }
-    ts.getScriptKindFromFileName = getScriptKindFromFileName;
-    ts.supportedTypeScriptExtensions = [".ts", ".tsx", ".d.ts"];
-    ts.supportedTypescriptExtensionsForExtractExtension = [".d.ts", ".ts", ".tsx"];
-    ts.supportedJavascriptExtensions = [".js", ".jsx"];
-    var allSupportedExtensions = ts.supportedTypeScriptExtensions.concat(ts.supportedJavascriptExtensions);
-    function getSupportedExtensions(options, extraFileExtensions) {
-        var needJsExtensions = options && options.allowJs;
-        if (!extraFileExtensions || extraFileExtensions.length === 0) {
-            return needJsExtensions ? allSupportedExtensions : ts.supportedTypeScriptExtensions;
-        }
-        var extensions = (needJsExtensions ? allSupportedExtensions : ts.supportedTypeScriptExtensions).concat(mapDefined(extraFileExtensions, function (x) { return x.scriptKind === 7 || needJsExtensions && isJavaScriptLike(x.scriptKind) ? x.extension : undefined; }));
-        return deduplicate(extensions, equateStringsCaseSensitive, compareStringsCaseSensitive);
-    }
-    ts.getSupportedExtensions = getSupportedExtensions;
-    function isJavaScriptLike(scriptKind) {
-        return scriptKind === 1 || scriptKind === 2;
-    }
-    function hasJavaScriptFileExtension(fileName) {
-        return some(ts.supportedJavascriptExtensions, function (extension) { return fileExtensionIs(fileName, extension); });
-    }
-    ts.hasJavaScriptFileExtension = hasJavaScriptFileExtension;
-    function hasTypeScriptFileExtension(fileName) {
-        return some(ts.supportedTypeScriptExtensions, function (extension) { return fileExtensionIs(fileName, extension); });
-    }
-    ts.hasTypeScriptFileExtension = hasTypeScriptFileExtension;
-    function isSupportedSourceFileName(fileName, compilerOptions, extraFileExtensions) {
-        if (!fileName) {
-            return false;
-        }
-        for (var _i = 0, _a = getSupportedExtensions(compilerOptions, extraFileExtensions); _i < _a.length; _i++) {
-            var extension = _a[_i];
-            if (fileExtensionIs(fileName, extension)) {
-                return true;
-            }
-        }
-        return false;
-    }
-    ts.isSupportedSourceFileName = isSupportedSourceFileName;
-    function getExtensionPriority(path, supportedExtensions) {
-        for (var i = supportedExtensions.length - 1; i >= 0; i--) {
-            if (fileExtensionIs(path, supportedExtensions[i])) {
-                return adjustExtensionPriority(i, supportedExtensions);
-            }
-        }
-        return 0;
-    }
-    ts.getExtensionPriority = getExtensionPriority;
-    function adjustExtensionPriority(extensionPriority, supportedExtensions) {
-        if (extensionPriority < 2) {
-            return 0;
-        }
-        else if (extensionPriority < supportedExtensions.length) {
-            return 2;
-        }
-        else {
-            return supportedExtensions.length;
-        }
-    }
-    ts.adjustExtensionPriority = adjustExtensionPriority;
-    function getNextLowestExtensionPriority(extensionPriority, supportedExtensions) {
-        if (extensionPriority < 2) {
-            return 2;
-        }
-        else {
-            return supportedExtensions.length;
-        }
-    }
-    ts.getNextLowestExtensionPriority = getNextLowestExtensionPriority;
-    var extensionsToRemove = [".d.ts", ".ts", ".js", ".tsx", ".jsx", ".json"];
-    function removeFileExtension(path) {
-        for (var _i = 0, extensionsToRemove_1 = extensionsToRemove; _i < extensionsToRemove_1.length; _i++) {
-            var ext = extensionsToRemove_1[_i];
-            var extensionless = tryRemoveExtension(path, ext);
-            if (extensionless !== undefined) {
-                return extensionless;
-            }
-        }
-        return path;
-    }
-    ts.removeFileExtension = removeFileExtension;
-    function tryRemoveExtension(path, extension) {
-        return fileExtensionIs(path, extension) ? removeExtension(path, extension) : undefined;
-    }
-    ts.tryRemoveExtension = tryRemoveExtension;
-    function removeExtension(path, extension) {
-        return path.substring(0, path.length - extension.length);
-    }
-    ts.removeExtension = removeExtension;
-    function changeExtension(path, newExtension) {
-        return changeAnyExtension(path, newExtension, extensionsToRemove, false);
-    }
-    ts.changeExtension = changeExtension;
-    function changeAnyExtension(path, ext, extensions, ignoreCase) {
-        var pathext = extensions !== undefined && ignoreCase !== undefined ? getAnyExtensionFromPath(path, extensions, ignoreCase) : getAnyExtensionFromPath(path);
-        return pathext ? path.slice(0, path.length - pathext.length) + (startsWith(ext, ".") ? ext : "." + ext) : path;
-    }
-    ts.changeAnyExtension = changeAnyExtension;
-    function removeMinAndVersionNumbers(fileName) {
-        var trailingMinOrVersion = /[.-]((min)|(\d+(\.\d+)*))$/;
-        return fileName.replace(trailingMinOrVersion, "").replace(trailingMinOrVersion, "");
-    }
-    ts.removeMinAndVersionNumbers = removeMinAndVersionNumbers;
-    function Symbol(flags, name) {
-        this.flags = flags;
-        this.escapedName = name;
-        this.declarations = undefined;
-        this.valueDeclaration = undefined;
-        this.id = undefined;
-        this.mergeId = undefined;
-        this.parent = undefined;
-    }
-    function Type(checker, flags) {
-        this.flags = flags;
-        if (Debug.isDebugging) {
-            this.checker = checker;
-        }
-    }
-    function Signature() { }
-    function Node(kind, pos, end) {
-        this.pos = pos;
-        this.end = end;
-        this.kind = kind;
-        this.id = 0;
-        this.flags = 0;
-        this.modifierFlagsCache = 0;
-        this.transformFlags = 0;
-        this.parent = undefined;
-        this.original = undefined;
-    }
-    function SourceMapSource(fileName, text, skipTrivia) {
-        this.fileName = fileName;
-        this.text = text;
-        this.skipTrivia = skipTrivia || (function (pos) { return pos; });
-    }
-    ts.objectAllocator = {
-        getNodeConstructor: function () { return Node; },
-        getTokenConstructor: function () { return Node; },
-        getIdentifierConstructor: function () { return Node; },
-        getSourceFileConstructor: function () { return Node; },
-        getSymbolConstructor: function () { return Symbol; },
-        getTypeConstructor: function () { return Type; },
-        getSignatureConstructor: function () { return Signature; },
-        getSourceMapSourceConstructor: function () { return SourceMapSource; },
-    };
+    var AssertionLevel;
+    (function (AssertionLevel) {
+        AssertionLevel[AssertionLevel["None"] = 0] = "None";
+        AssertionLevel[AssertionLevel["Normal"] = 1] = "Normal";
+        AssertionLevel[AssertionLevel["Aggressive"] = 2] = "Aggressive";
+        AssertionLevel[AssertionLevel["VeryAggressive"] = 3] = "VeryAggressive";
+    })(AssertionLevel = ts.AssertionLevel || (ts.AssertionLevel = {}));
     var Debug;
     (function (Debug) {
-        Debug.currentAssertionLevel = 0;
+        Debug.currentAssertionLevel = 0 /* None */;
         Debug.isDebugging = false;
         function shouldAssert(level) {
             return Debug.currentAssertionLevel >= level;
@@ -2642,27 +1505,350 @@ var ts;
             }
         }
         Debug.getFunctionName = getFunctionName;
-        function showSymbol(symbol) {
-            var symbolFlags = ts.SymbolFlags;
-            return "{ flags: " + (symbolFlags ? showFlags(symbol.flags, symbolFlags) : symbol.flags) + "; declarations: " + map(symbol.declarations, showSyntaxKind) + " }";
+    })(Debug = ts.Debug || (ts.Debug = {}));
+    function equateValues(a, b) {
+        return a === b;
+    }
+    ts.equateValues = equateValues;
+    /**
+     * Compare the equality of two strings using a case-sensitive ordinal comparison.
+     *
+     * Case-sensitive comparisons compare both strings one code-point at a time using the integer
+     * value of each code-point after applying `toUpperCase` to each string. We always map both
+     * strings to their upper-case form as some unicode characters do not properly round-trip to
+     * lowercase (such as `ẞ` (German sharp capital s)).
+     */
+    function equateStringsCaseInsensitive(a, b) {
+        return a === b
+            || a !== undefined
+                && b !== undefined
+                && a.toUpperCase() === b.toUpperCase();
+    }
+    ts.equateStringsCaseInsensitive = equateStringsCaseInsensitive;
+    /**
+     * Compare the equality of two strings using a case-sensitive ordinal comparison.
+     *
+     * Case-sensitive comparisons compare both strings one code-point at a time using the
+     * integer value of each code-point.
+     */
+    function equateStringsCaseSensitive(a, b) {
+        return equateValues(a, b);
+    }
+    ts.equateStringsCaseSensitive = equateStringsCaseSensitive;
+    function compareComparableValues(a, b) {
+        return a === b ? 0 /* EqualTo */ :
+            a === undefined ? -1 /* LessThan */ :
+                b === undefined ? 1 /* GreaterThan */ :
+                    a < b ? -1 /* LessThan */ :
+                        1 /* GreaterThan */;
+    }
+    /**
+     * Compare two numeric values for their order relative to each other.
+     * To compare strings, use any of the `compareStrings` functions.
+     */
+    function compareValues(a, b) {
+        return compareComparableValues(a, b);
+    }
+    ts.compareValues = compareValues;
+    function min(a, b, compare) {
+        return compare(a, b) === -1 /* LessThan */ ? a : b;
+    }
+    ts.min = min;
+    /**
+     * Compare two strings using a case-insensitive ordinal comparison.
+     *
+     * Ordinal comparisons are based on the difference between the unicode code points of both
+     * strings. Characters with multiple unicode representations are considered unequal. Ordinal
+     * comparisons provide predictable ordering, but place "a" after "B".
+     *
+     * Case-insensitive comparisons compare both strings one code-point at a time using the integer
+     * value of each code-point after applying `toUpperCase` to each string. We always map both
+     * strings to their upper-case form as some unicode characters do not properly round-trip to
+     * lowercase (such as `ẞ` (German sharp capital s)).
+     */
+    function compareStringsCaseInsensitive(a, b) {
+        if (a === b)
+            return 0 /* EqualTo */;
+        if (a === undefined)
+            return -1 /* LessThan */;
+        if (b === undefined)
+            return 1 /* GreaterThan */;
+        a = a.toUpperCase();
+        b = b.toUpperCase();
+        return a < b ? -1 /* LessThan */ : a > b ? 1 /* GreaterThan */ : 0 /* EqualTo */;
+    }
+    ts.compareStringsCaseInsensitive = compareStringsCaseInsensitive;
+    /**
+     * Compare two strings using a case-sensitive ordinal comparison.
+     *
+     * Ordinal comparisons are based on the difference between the unicode code points of both
+     * strings. Characters with multiple unicode representations are considered unequal. Ordinal
+     * comparisons provide predictable ordering, but place "a" after "B".
+     *
+     * Case-sensitive comparisons compare both strings one code-point at a time using the integer
+     * value of each code-point.
+     */
+    function compareStringsCaseSensitive(a, b) {
+        return compareComparableValues(a, b);
+    }
+    ts.compareStringsCaseSensitive = compareStringsCaseSensitive;
+    function getStringComparer(ignoreCase) {
+        return ignoreCase ? compareStringsCaseInsensitive : compareStringsCaseSensitive;
+    }
+    ts.getStringComparer = getStringComparer;
+    /**
+     * Creates a string comparer for use with string collation in the UI.
+     */
+    var createUIStringComparer = (function () {
+        var defaultComparer;
+        var enUSComparer;
+        var stringComparerFactory = getStringComparerFactory();
+        return createStringComparer;
+        function compareWithCallback(a, b, comparer) {
+            if (a === b)
+                return 0 /* EqualTo */;
+            if (a === undefined)
+                return -1 /* LessThan */;
+            if (b === undefined)
+                return 1 /* GreaterThan */;
+            var value = comparer(a, b);
+            return value < 0 ? -1 /* LessThan */ : value > 0 ? 1 /* GreaterThan */ : 0 /* EqualTo */;
         }
-        Debug.showSymbol = showSymbol;
-        function showFlags(flags, flagsEnum) {
-            var out = [];
-            for (var pow = 0; pow <= 30; pow++) {
-                var n = 1 << pow;
-                if (flags & n) {
-                    out.push(flagsEnum[n]);
+        function createIntlCollatorStringComparer(locale) {
+            // Intl.Collator.prototype.compare is bound to the collator. See NOTE in
+            // http://www.ecma-international.org/ecma-402/2.0/#sec-Intl.Collator.prototype.compare
+            var comparer = new Intl.Collator(locale, { usage: "sort", sensitivity: "variant" }).compare;
+            return function (a, b) { return compareWithCallback(a, b, comparer); };
+        }
+        function createLocaleCompareStringComparer(locale) {
+            // if the locale is not the default locale (`undefined`), use the fallback comparer.
+            if (locale !== undefined)
+                return createFallbackStringComparer();
+            return function (a, b) { return compareWithCallback(a, b, compareStrings); };
+            function compareStrings(a, b) {
+                return a.localeCompare(b);
+            }
+        }
+        function createFallbackStringComparer() {
+            // An ordinal comparison puts "A" after "b", but for the UI we want "A" before "b".
+            // We first sort case insensitively.  So "Aaa" will come before "baa".
+            // Then we sort case sensitively, so "aaa" will come before "Aaa".
+            //
+            // For case insensitive comparisons we always map both strings to their
+            // upper-case form as some unicode characters do not properly round-trip to
+            // lowercase (such as `ẞ` (German sharp capital s)).
+            return function (a, b) { return compareWithCallback(a, b, compareDictionaryOrder); };
+            function compareDictionaryOrder(a, b) {
+                return compareStrings(a.toUpperCase(), b.toUpperCase()) || compareStrings(a, b);
+            }
+            function compareStrings(a, b) {
+                return a < b ? -1 /* LessThan */ : a > b ? 1 /* GreaterThan */ : 0 /* EqualTo */;
+            }
+        }
+        function getStringComparerFactory() {
+            // If the host supports Intl, we use it for comparisons using the default locale.
+            if (typeof Intl === "object" && typeof Intl.Collator === "function") {
+                return createIntlCollatorStringComparer;
+            }
+            // If the host does not support Intl, we fall back to localeCompare.
+            // localeCompare in Node v0.10 is just an ordinal comparison, so don't use it.
+            if (typeof String.prototype.localeCompare === "function" &&
+                typeof String.prototype.toLocaleUpperCase === "function" &&
+                "a".localeCompare("B") < 0) {
+                return createLocaleCompareStringComparer;
+            }
+            // Otherwise, fall back to ordinal comparison:
+            return createFallbackStringComparer;
+        }
+        function createStringComparer(locale) {
+            // Hold onto common string comparers. This avoids constantly reallocating comparers during
+            // tests.
+            if (locale === undefined) {
+                return defaultComparer || (defaultComparer = stringComparerFactory(locale));
+            }
+            else if (locale === "en-US") {
+                return enUSComparer || (enUSComparer = stringComparerFactory(locale));
+            }
+            else {
+                return stringComparerFactory(locale);
+            }
+        }
+    })();
+    var uiComparerCaseSensitive;
+    var uiLocale;
+    function getUILocale() {
+        return uiLocale;
+    }
+    ts.getUILocale = getUILocale;
+    function setUILocale(value) {
+        if (uiLocale !== value) {
+            uiLocale = value;
+            uiComparerCaseSensitive = undefined;
+        }
+    }
+    ts.setUILocale = setUILocale;
+    /**
+     * Compare two strings in a using the case-sensitive sort behavior of the UI locale.
+     *
+     * Ordering is not predictable between different host locales, but is best for displaying
+     * ordered data for UI presentation. Characters with multiple unicode representations may
+     * be considered equal.
+     *
+     * Case-sensitive comparisons compare strings that differ in base characters, or
+     * accents/diacritic marks, or case as unequal.
+     */
+    function compareStringsCaseSensitiveUI(a, b) {
+        var comparer = uiComparerCaseSensitive || (uiComparerCaseSensitive = createUIStringComparer(uiLocale));
+        return comparer(a, b);
+    }
+    ts.compareStringsCaseSensitiveUI = compareStringsCaseSensitiveUI;
+    function compareProperties(a, b, key, comparer) {
+        return a === b ? 0 /* EqualTo */ :
+            a === undefined ? -1 /* LessThan */ :
+                b === undefined ? 1 /* GreaterThan */ :
+                    comparer(a[key], b[key]);
+    }
+    ts.compareProperties = compareProperties;
+    /** True is greater than false. */
+    function compareBooleans(a, b) {
+        return compareValues(a ? 1 : 0, b ? 1 : 0);
+    }
+    ts.compareBooleans = compareBooleans;
+    /**
+     * Given a name and a list of names that are *not* equal to the name, return a spelling suggestion if there is one that is close enough.
+     * Names less than length 3 only check for case-insensitive equality, not Levenshtein distance.
+     *
+     * If there is a candidate that's the same except for case, return that.
+     * If there is a candidate that's within one edit of the name, return that.
+     * Otherwise, return the candidate with the smallest Levenshtein distance,
+     *    except for candidates:
+     *      * With no name
+     *      * Whose length differs from the target name by more than 0.34 of the length of the name.
+     *      * Whose levenshtein distance is more than 0.4 of the length of the name
+     *        (0.4 allows 1 substitution/transposition for every 5 characters,
+     *         and 1 insertion/deletion at 3 characters)
+     */
+    function getSpellingSuggestion(name, candidates, getName) {
+        var maximumLengthDifference = Math.min(2, Math.floor(name.length * 0.34));
+        var bestDistance = Math.floor(name.length * 0.4) + 1; // If the best result isn't better than this, don't bother.
+        var bestCandidate;
+        var justCheckExactMatches = false;
+        var nameLowerCase = name.toLowerCase();
+        for (var _i = 0, candidates_1 = candidates; _i < candidates_1.length; _i++) {
+            var candidate = candidates_1[_i];
+            var candidateName = getName(candidate);
+            if (candidateName !== undefined && Math.abs(candidateName.length - nameLowerCase.length) <= maximumLengthDifference) {
+                var candidateNameLowerCase = candidateName.toLowerCase();
+                if (candidateNameLowerCase === nameLowerCase) {
+                    return candidate;
+                }
+                if (justCheckExactMatches) {
+                    continue;
+                }
+                if (candidateName.length < 3) {
+                    // Don't bother, user would have noticed a 2-character name having an extra character
+                    continue;
+                }
+                // Only care about a result better than the best so far.
+                var distance = levenshteinWithMax(nameLowerCase, candidateNameLowerCase, bestDistance - 1);
+                if (distance === undefined) {
+                    continue;
+                }
+                if (distance < 3) {
+                    justCheckExactMatches = true;
+                    bestCandidate = candidate;
+                }
+                else {
+                    Debug.assert(distance < bestDistance); // Else `levenshteinWithMax` should return undefined
+                    bestDistance = distance;
+                    bestCandidate = candidate;
                 }
             }
-            return out.join("|");
         }
-        function showSyntaxKind(node) {
-            var syntaxKind = ts.SyntaxKind;
-            return syntaxKind ? syntaxKind[node.kind] : node.kind.toString();
+        return bestCandidate;
+    }
+    ts.getSpellingSuggestion = getSpellingSuggestion;
+    function levenshteinWithMax(s1, s2, max) {
+        var previous = new Array(s2.length + 1);
+        var current = new Array(s2.length + 1);
+        /** Represents any value > max. We don't care about the particular value. */
+        var big = max + 1;
+        for (var i = 0; i <= s2.length; i++) {
+            previous[i] = i;
         }
-        Debug.showSyntaxKind = showSyntaxKind;
-    })(Debug = ts.Debug || (ts.Debug = {}));
+        for (var i = 1; i <= s1.length; i++) {
+            var c1 = s1.charCodeAt(i - 1);
+            var minJ = i > max ? i - max : 1;
+            var maxJ = s2.length > max + i ? max + i : s2.length;
+            current[0] = i;
+            /** Smallest value of the matrix in the ith column. */
+            var colMin = i;
+            for (var j = 1; j < minJ; j++) {
+                current[j] = big;
+            }
+            for (var j = minJ; j <= maxJ; j++) {
+                var dist = c1 === s2.charCodeAt(j - 1)
+                    ? previous[j - 1]
+                    : Math.min(/*delete*/ previous[j] + 1, /*insert*/ current[j - 1] + 1, /*substitute*/ previous[j - 1] + 2);
+                current[j] = dist;
+                colMin = Math.min(colMin, dist);
+            }
+            for (var j = maxJ + 1; j <= s2.length; j++) {
+                current[j] = big;
+            }
+            if (colMin > max) {
+                // Give up -- everything in this column is > max and it can't get better in future columns.
+                return undefined;
+            }
+            var temp = previous;
+            previous = current;
+            current = temp;
+        }
+        var res = previous[s2.length];
+        return res > max ? undefined : res;
+    }
+    function endsWith(str, suffix) {
+        var expectedPos = str.length - suffix.length;
+        return expectedPos >= 0 && str.indexOf(suffix, expectedPos) === expectedPos;
+    }
+    ts.endsWith = endsWith;
+    function removeSuffix(str, suffix) {
+        return endsWith(str, suffix) ? str.slice(0, str.length - suffix.length) : str;
+    }
+    ts.removeSuffix = removeSuffix;
+    function tryRemoveSuffix(str, suffix) {
+        return endsWith(str, suffix) ? str.slice(0, str.length - suffix.length) : undefined;
+    }
+    ts.tryRemoveSuffix = tryRemoveSuffix;
+    function stringContains(str, substring) {
+        return str.indexOf(substring) !== -1;
+    }
+    ts.stringContains = stringContains;
+    function fileExtensionIs(path, extension) {
+        return path.length > extension.length && endsWith(path, extension);
+    }
+    ts.fileExtensionIs = fileExtensionIs;
+    function fileExtensionIsOneOf(path, extensions) {
+        for (var _i = 0, extensions_1 = extensions; _i < extensions_1.length; _i++) {
+            var extension = extensions_1[_i];
+            if (fileExtensionIs(path, extension)) {
+                return true;
+            }
+        }
+        return false;
+    }
+    ts.fileExtensionIsOneOf = fileExtensionIsOneOf;
+    /**
+     * Takes a string like "jquery-min.4.2.3" and returns "jquery"
+     */
+    function removeMinAndVersionNumbers(fileName) {
+        // Match a "." or "-" followed by a version number or 'min' at the end of the name
+        var trailingMinOrVersion = /[.-]((min)|(\d+(\.\d+)*))$/;
+        // The "min" or version may both be present, in either order, so try applying the above twice.
+        return fileName.replace(trailingMinOrVersion, "").replace(trailingMinOrVersion, "");
+    }
+    ts.removeMinAndVersionNumbers = removeMinAndVersionNumbers;
+    /** Remove an item from an array, moving everything to its right one space left. */
     function orderedRemoveItem(array, item) {
         for (var i = 0; i < array.length; i++) {
             if (array[i] === item) {
@@ -2673,7 +1859,9 @@ var ts;
         return false;
     }
     ts.orderedRemoveItem = orderedRemoveItem;
+    /** Remove an item by index from an array, moving everything to its right one space left. */
     function orderedRemoveItemAt(array, index) {
+        // This seems to be faster than either `array.splice(i, 1)` or `array.copyWithin(i, i+ 1)`.
         for (var i = index; i < array.length - 1; i++) {
             array[i] = array[i + 1];
         }
@@ -2681,14 +1869,17 @@ var ts;
     }
     ts.orderedRemoveItemAt = orderedRemoveItemAt;
     function unorderedRemoveItemAt(array, index) {
+        // Fill in the "hole" left at `index`.
         array[index] = array[array.length - 1];
         array.pop();
     }
     ts.unorderedRemoveItemAt = unorderedRemoveItemAt;
+    /** Remove the *first* occurrence of `item` from the array. */
     function unorderedRemoveItem(array, item) {
         return unorderedRemoveFirstItemWhere(array, function (element) { return element === item; });
     }
     ts.unorderedRemoveItem = unorderedRemoveItem;
+    /** Remove the *first* element satisfying `predicate`. */
     function unorderedRemoveFirstItemWhere(array, predicate) {
         for (var i = 0; i < array.length; i++) {
             if (predicate(array[i])) {
@@ -2702,33 +1893,24 @@ var ts;
         return useCaseSensitiveFileNames ? identity : toLowerCase;
     }
     ts.createGetCanonicalFileName = createGetCanonicalFileName;
-    function matchPatternOrExact(patternStrings, candidate) {
-        var patterns = [];
-        for (var _i = 0, patternStrings_1 = patternStrings; _i < patternStrings_1.length; _i++) {
-            var patternString = patternStrings_1[_i];
-            var pattern = tryParsePattern(patternString);
-            if (pattern) {
-                patterns.push(pattern);
-            }
-            else if (patternString === candidate) {
-                return patternString;
-            }
-        }
-        return findBestPatternMatch(patterns, function (_) { return _; }, candidate);
-    }
-    ts.matchPatternOrExact = matchPatternOrExact;
     function patternText(_a) {
         var prefix = _a.prefix, suffix = _a.suffix;
         return prefix + "*" + suffix;
     }
     ts.patternText = patternText;
+    /**
+     * Given that candidate matches pattern, returns the text matching the '*'.
+     * E.g.: matchedText(tryParsePattern("foo*baz"), "foobarbaz") === "bar"
+     */
     function matchedText(pattern, candidate) {
         Debug.assert(isPatternMatch(pattern, candidate));
         return candidate.substring(pattern.prefix.length, candidate.length - pattern.suffix.length);
     }
     ts.matchedText = matchedText;
+    /** Return the object corresponding to the best pattern to match `candidate`. */
     function findBestPatternMatch(values, getPattern, candidate) {
         var matchedValue;
+        // use length of prefix as betterness criteria
         var longestMatchPrefixLength = -1;
         for (var _i = 0, values_2 = values; _i < values_2.length; _i++) {
             var v = values_2[_i];
@@ -2741,78 +1923,24 @@ var ts;
         return matchedValue;
     }
     ts.findBestPatternMatch = findBestPatternMatch;
+    function startsWith(str, prefix) {
+        return str.lastIndexOf(prefix, 0) === 0;
+    }
+    ts.startsWith = startsWith;
+    function removePrefix(str, prefix) {
+        return startsWith(str, prefix) ? str.substr(prefix.length) : str;
+    }
+    ts.removePrefix = removePrefix;
+    function tryRemovePrefix(str, prefix) {
+        return startsWith(str, prefix) ? str.substring(prefix.length) : undefined;
+    }
+    ts.tryRemovePrefix = tryRemovePrefix;
     function isPatternMatch(_a, candidate) {
         var prefix = _a.prefix, suffix = _a.suffix;
         return candidate.length >= prefix.length + suffix.length &&
             startsWith(candidate, prefix) &&
             endsWith(candidate, suffix);
     }
-    function tryParsePattern(pattern) {
-        Debug.assert(hasZeroOrOneAsteriskCharacter(pattern));
-        var indexOfStar = pattern.indexOf("*");
-        return indexOfStar === -1 ? undefined : {
-            prefix: pattern.substr(0, indexOfStar),
-            suffix: pattern.substr(indexOfStar + 1)
-        };
-    }
-    ts.tryParsePattern = tryParsePattern;
-    function positionIsSynthesized(pos) {
-        return !(pos >= 0);
-    }
-    ts.positionIsSynthesized = positionIsSynthesized;
-    function extensionIsTypeScript(ext) {
-        return ext === ".ts" || ext === ".tsx" || ext === ".d.ts";
-    }
-    ts.extensionIsTypeScript = extensionIsTypeScript;
-    function resolutionExtensionIsTypeScriptOrJson(ext) {
-        return extensionIsTypeScript(ext) || ext === ".json";
-    }
-    ts.resolutionExtensionIsTypeScriptOrJson = resolutionExtensionIsTypeScriptOrJson;
-    function extensionFromPath(path) {
-        var ext = tryGetExtensionFromPath(path);
-        return ext !== undefined ? ext : Debug.fail("File " + path + " has unknown extension.");
-    }
-    ts.extensionFromPath = extensionFromPath;
-    function isAnySupportedFileExtension(path) {
-        return tryGetExtensionFromPath(path) !== undefined;
-    }
-    ts.isAnySupportedFileExtension = isAnySupportedFileExtension;
-    function tryGetExtensionFromPath(path) {
-        return find(ts.supportedTypescriptExtensionsForExtractExtension, function (e) { return fileExtensionIs(path, e); }) || find(ts.supportedJavascriptExtensions, function (e) { return fileExtensionIs(path, e); });
-    }
-    ts.tryGetExtensionFromPath = tryGetExtensionFromPath;
-    function getAnyExtensionFromPathWorker(path, extensions, stringEqualityComparer) {
-        if (typeof extensions === "string")
-            extensions = [extensions];
-        for (var _i = 0, extensions_2 = extensions; _i < extensions_2.length; _i++) {
-            var extension = extensions_2[_i];
-            if (!startsWith(extension, "."))
-                extension = "." + extension;
-            if (path.length >= extension.length && path.charAt(path.length - extension.length) === ".") {
-                var pathExtension = path.slice(path.length - extension.length);
-                if (stringEqualityComparer(pathExtension, extension)) {
-                    return pathExtension;
-                }
-            }
-        }
-        return "";
-    }
-    function getAnyExtensionFromPath(path, extensions, ignoreCase) {
-        if (extensions) {
-            return getAnyExtensionFromPathWorker(path, extensions, ignoreCase ? equateStringsCaseInsensitive : equateStringsCaseSensitive);
-        }
-        var baseFileName = getBaseFileName(path);
-        var extensionIndex = baseFileName.lastIndexOf(".");
-        if (extensionIndex >= 0) {
-            return baseFileName.substring(extensionIndex);
-        }
-        return "";
-    }
-    ts.getAnyExtensionFromPath = getAnyExtensionFromPath;
-    function isCheckJsEnabledForFile(sourceFile, compilerOptions) {
-        return sourceFile.checkJsDirective ? sourceFile.checkJsDirective.enabled : compilerOptions.checkJs;
-    }
-    ts.isCheckJsEnabledForFile = isCheckJsEnabledForFile;
     function and(f, g) {
         return function (arg) { return f(arg) && g(arg); };
     }
@@ -2821,12 +1949,8 @@ var ts;
         return function (arg) { return f(arg) || g(arg); };
     }
     ts.or = or;
-    function assertTypeIsNever(_) { }
+    function assertTypeIsNever(_) { } // tslint:disable-line no-empty
     ts.assertTypeIsNever = assertTypeIsNever;
-    ts.emptyFileSystemEntries = {
-        files: ts.emptyArray,
-        directories: ts.emptyArray
-    };
     function singleElementArray(t) {
         return t === undefined ? undefined : [t];
     }
@@ -2841,11 +1965,11 @@ var ts;
             var newItem = newItems[newIndex];
             var oldItem = oldItems[oldIndex];
             var compareResult = comparer(newItem, oldItem);
-            if (compareResult === -1) {
+            if (compareResult === -1 /* LessThan */) {
                 inserted(newItem);
                 newIndex++;
             }
-            else if (compareResult === 1) {
+            else if (compareResult === 1 /* GreaterThan */) {
                 deleted(oldItem);
                 oldIndex++;
             }
@@ -2864,10 +1988,1526 @@ var ts;
     }
     ts.enumerateInsertsAndDeletes = enumerateInsertsAndDeletes;
 })(ts || (ts = {}));
+//# sourceMappingURL=core.js.map
+"use strict";
+var __assign = (this && this.__assign) || Object.assign || function(t) {
+    for (var s, i = 1, n = arguments.length; i < n; i++) {
+        s = arguments[i];
+        for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
+            t[p] = s[p];
+    }
+    return t;
+};
 var ts;
 (function (ts) {
+    // token > SyntaxKind.Identifier => token is a keyword
+    // Also, If you add a new SyntaxKind be sure to keep the `Markers` section at the bottom in sync
+    var SyntaxKind;
+    (function (SyntaxKind) {
+        SyntaxKind[SyntaxKind["Unknown"] = 0] = "Unknown";
+        SyntaxKind[SyntaxKind["EndOfFileToken"] = 1] = "EndOfFileToken";
+        SyntaxKind[SyntaxKind["SingleLineCommentTrivia"] = 2] = "SingleLineCommentTrivia";
+        SyntaxKind[SyntaxKind["MultiLineCommentTrivia"] = 3] = "MultiLineCommentTrivia";
+        SyntaxKind[SyntaxKind["NewLineTrivia"] = 4] = "NewLineTrivia";
+        SyntaxKind[SyntaxKind["WhitespaceTrivia"] = 5] = "WhitespaceTrivia";
+        // We detect and preserve #! on the first line
+        SyntaxKind[SyntaxKind["ShebangTrivia"] = 6] = "ShebangTrivia";
+        // We detect and provide better error recovery when we encounter a git merge marker.  This
+        // allows us to edit files with git-conflict markers in them in a much more pleasant manner.
+        SyntaxKind[SyntaxKind["ConflictMarkerTrivia"] = 7] = "ConflictMarkerTrivia";
+        // Literals
+        SyntaxKind[SyntaxKind["NumericLiteral"] = 8] = "NumericLiteral";
+        SyntaxKind[SyntaxKind["StringLiteral"] = 9] = "StringLiteral";
+        SyntaxKind[SyntaxKind["JsxText"] = 10] = "JsxText";
+        SyntaxKind[SyntaxKind["JsxTextAllWhiteSpaces"] = 11] = "JsxTextAllWhiteSpaces";
+        SyntaxKind[SyntaxKind["RegularExpressionLiteral"] = 12] = "RegularExpressionLiteral";
+        SyntaxKind[SyntaxKind["NoSubstitutionTemplateLiteral"] = 13] = "NoSubstitutionTemplateLiteral";
+        // Pseudo-literals
+        SyntaxKind[SyntaxKind["TemplateHead"] = 14] = "TemplateHead";
+        SyntaxKind[SyntaxKind["TemplateMiddle"] = 15] = "TemplateMiddle";
+        SyntaxKind[SyntaxKind["TemplateTail"] = 16] = "TemplateTail";
+        // Punctuation
+        SyntaxKind[SyntaxKind["OpenBraceToken"] = 17] = "OpenBraceToken";
+        SyntaxKind[SyntaxKind["CloseBraceToken"] = 18] = "CloseBraceToken";
+        SyntaxKind[SyntaxKind["OpenParenToken"] = 19] = "OpenParenToken";
+        SyntaxKind[SyntaxKind["CloseParenToken"] = 20] = "CloseParenToken";
+        SyntaxKind[SyntaxKind["OpenBracketToken"] = 21] = "OpenBracketToken";
+        SyntaxKind[SyntaxKind["CloseBracketToken"] = 22] = "CloseBracketToken";
+        SyntaxKind[SyntaxKind["DotToken"] = 23] = "DotToken";
+        SyntaxKind[SyntaxKind["DotDotDotToken"] = 24] = "DotDotDotToken";
+        SyntaxKind[SyntaxKind["SemicolonToken"] = 25] = "SemicolonToken";
+        SyntaxKind[SyntaxKind["CommaToken"] = 26] = "CommaToken";
+        SyntaxKind[SyntaxKind["LessThanToken"] = 27] = "LessThanToken";
+        SyntaxKind[SyntaxKind["LessThanSlashToken"] = 28] = "LessThanSlashToken";
+        SyntaxKind[SyntaxKind["GreaterThanToken"] = 29] = "GreaterThanToken";
+        SyntaxKind[SyntaxKind["LessThanEqualsToken"] = 30] = "LessThanEqualsToken";
+        SyntaxKind[SyntaxKind["GreaterThanEqualsToken"] = 31] = "GreaterThanEqualsToken";
+        SyntaxKind[SyntaxKind["EqualsEqualsToken"] = 32] = "EqualsEqualsToken";
+        SyntaxKind[SyntaxKind["ExclamationEqualsToken"] = 33] = "ExclamationEqualsToken";
+        SyntaxKind[SyntaxKind["EqualsEqualsEqualsToken"] = 34] = "EqualsEqualsEqualsToken";
+        SyntaxKind[SyntaxKind["ExclamationEqualsEqualsToken"] = 35] = "ExclamationEqualsEqualsToken";
+        SyntaxKind[SyntaxKind["EqualsGreaterThanToken"] = 36] = "EqualsGreaterThanToken";
+        SyntaxKind[SyntaxKind["PlusToken"] = 37] = "PlusToken";
+        SyntaxKind[SyntaxKind["MinusToken"] = 38] = "MinusToken";
+        SyntaxKind[SyntaxKind["AsteriskToken"] = 39] = "AsteriskToken";
+        SyntaxKind[SyntaxKind["AsteriskAsteriskToken"] = 40] = "AsteriskAsteriskToken";
+        SyntaxKind[SyntaxKind["SlashToken"] = 41] = "SlashToken";
+        SyntaxKind[SyntaxKind["PercentToken"] = 42] = "PercentToken";
+        SyntaxKind[SyntaxKind["PlusPlusToken"] = 43] = "PlusPlusToken";
+        SyntaxKind[SyntaxKind["MinusMinusToken"] = 44] = "MinusMinusToken";
+        SyntaxKind[SyntaxKind["LessThanLessThanToken"] = 45] = "LessThanLessThanToken";
+        SyntaxKind[SyntaxKind["GreaterThanGreaterThanToken"] = 46] = "GreaterThanGreaterThanToken";
+        SyntaxKind[SyntaxKind["GreaterThanGreaterThanGreaterThanToken"] = 47] = "GreaterThanGreaterThanGreaterThanToken";
+        SyntaxKind[SyntaxKind["AmpersandToken"] = 48] = "AmpersandToken";
+        SyntaxKind[SyntaxKind["BarToken"] = 49] = "BarToken";
+        SyntaxKind[SyntaxKind["CaretToken"] = 50] = "CaretToken";
+        SyntaxKind[SyntaxKind["ExclamationToken"] = 51] = "ExclamationToken";
+        SyntaxKind[SyntaxKind["TildeToken"] = 52] = "TildeToken";
+        SyntaxKind[SyntaxKind["AmpersandAmpersandToken"] = 53] = "AmpersandAmpersandToken";
+        SyntaxKind[SyntaxKind["BarBarToken"] = 54] = "BarBarToken";
+        SyntaxKind[SyntaxKind["QuestionToken"] = 55] = "QuestionToken";
+        SyntaxKind[SyntaxKind["ColonToken"] = 56] = "ColonToken";
+        SyntaxKind[SyntaxKind["AtToken"] = 57] = "AtToken";
+        // Assignments
+        SyntaxKind[SyntaxKind["EqualsToken"] = 58] = "EqualsToken";
+        SyntaxKind[SyntaxKind["PlusEqualsToken"] = 59] = "PlusEqualsToken";
+        SyntaxKind[SyntaxKind["MinusEqualsToken"] = 60] = "MinusEqualsToken";
+        SyntaxKind[SyntaxKind["AsteriskEqualsToken"] = 61] = "AsteriskEqualsToken";
+        SyntaxKind[SyntaxKind["AsteriskAsteriskEqualsToken"] = 62] = "AsteriskAsteriskEqualsToken";
+        SyntaxKind[SyntaxKind["SlashEqualsToken"] = 63] = "SlashEqualsToken";
+        SyntaxKind[SyntaxKind["PercentEqualsToken"] = 64] = "PercentEqualsToken";
+        SyntaxKind[SyntaxKind["LessThanLessThanEqualsToken"] = 65] = "LessThanLessThanEqualsToken";
+        SyntaxKind[SyntaxKind["GreaterThanGreaterThanEqualsToken"] = 66] = "GreaterThanGreaterThanEqualsToken";
+        SyntaxKind[SyntaxKind["GreaterThanGreaterThanGreaterThanEqualsToken"] = 67] = "GreaterThanGreaterThanGreaterThanEqualsToken";
+        SyntaxKind[SyntaxKind["AmpersandEqualsToken"] = 68] = "AmpersandEqualsToken";
+        SyntaxKind[SyntaxKind["BarEqualsToken"] = 69] = "BarEqualsToken";
+        SyntaxKind[SyntaxKind["CaretEqualsToken"] = 70] = "CaretEqualsToken";
+        // Identifiers
+        SyntaxKind[SyntaxKind["Identifier"] = 71] = "Identifier";
+        // Reserved words
+        SyntaxKind[SyntaxKind["BreakKeyword"] = 72] = "BreakKeyword";
+        SyntaxKind[SyntaxKind["CaseKeyword"] = 73] = "CaseKeyword";
+        SyntaxKind[SyntaxKind["CatchKeyword"] = 74] = "CatchKeyword";
+        SyntaxKind[SyntaxKind["ClassKeyword"] = 75] = "ClassKeyword";
+        SyntaxKind[SyntaxKind["ConstKeyword"] = 76] = "ConstKeyword";
+        SyntaxKind[SyntaxKind["ContinueKeyword"] = 77] = "ContinueKeyword";
+        SyntaxKind[SyntaxKind["DebuggerKeyword"] = 78] = "DebuggerKeyword";
+        SyntaxKind[SyntaxKind["DefaultKeyword"] = 79] = "DefaultKeyword";
+        SyntaxKind[SyntaxKind["DeleteKeyword"] = 80] = "DeleteKeyword";
+        SyntaxKind[SyntaxKind["DoKeyword"] = 81] = "DoKeyword";
+        SyntaxKind[SyntaxKind["ElseKeyword"] = 82] = "ElseKeyword";
+        SyntaxKind[SyntaxKind["EnumKeyword"] = 83] = "EnumKeyword";
+        SyntaxKind[SyntaxKind["ExportKeyword"] = 84] = "ExportKeyword";
+        SyntaxKind[SyntaxKind["ExtendsKeyword"] = 85] = "ExtendsKeyword";
+        SyntaxKind[SyntaxKind["FalseKeyword"] = 86] = "FalseKeyword";
+        SyntaxKind[SyntaxKind["FinallyKeyword"] = 87] = "FinallyKeyword";
+        SyntaxKind[SyntaxKind["ForKeyword"] = 88] = "ForKeyword";
+        SyntaxKind[SyntaxKind["FunctionKeyword"] = 89] = "FunctionKeyword";
+        SyntaxKind[SyntaxKind["IfKeyword"] = 90] = "IfKeyword";
+        SyntaxKind[SyntaxKind["ImportKeyword"] = 91] = "ImportKeyword";
+        SyntaxKind[SyntaxKind["InKeyword"] = 92] = "InKeyword";
+        SyntaxKind[SyntaxKind["InstanceOfKeyword"] = 93] = "InstanceOfKeyword";
+        SyntaxKind[SyntaxKind["NewKeyword"] = 94] = "NewKeyword";
+        SyntaxKind[SyntaxKind["NullKeyword"] = 95] = "NullKeyword";
+        SyntaxKind[SyntaxKind["ReturnKeyword"] = 96] = "ReturnKeyword";
+        SyntaxKind[SyntaxKind["SuperKeyword"] = 97] = "SuperKeyword";
+        SyntaxKind[SyntaxKind["SwitchKeyword"] = 98] = "SwitchKeyword";
+        SyntaxKind[SyntaxKind["ThisKeyword"] = 99] = "ThisKeyword";
+        SyntaxKind[SyntaxKind["ThrowKeyword"] = 100] = "ThrowKeyword";
+        SyntaxKind[SyntaxKind["TrueKeyword"] = 101] = "TrueKeyword";
+        SyntaxKind[SyntaxKind["TryKeyword"] = 102] = "TryKeyword";
+        SyntaxKind[SyntaxKind["TypeOfKeyword"] = 103] = "TypeOfKeyword";
+        SyntaxKind[SyntaxKind["VarKeyword"] = 104] = "VarKeyword";
+        SyntaxKind[SyntaxKind["VoidKeyword"] = 105] = "VoidKeyword";
+        SyntaxKind[SyntaxKind["WhileKeyword"] = 106] = "WhileKeyword";
+        SyntaxKind[SyntaxKind["WithKeyword"] = 107] = "WithKeyword";
+        // Strict mode reserved words
+        SyntaxKind[SyntaxKind["ImplementsKeyword"] = 108] = "ImplementsKeyword";
+        SyntaxKind[SyntaxKind["InterfaceKeyword"] = 109] = "InterfaceKeyword";
+        SyntaxKind[SyntaxKind["LetKeyword"] = 110] = "LetKeyword";
+        SyntaxKind[SyntaxKind["PackageKeyword"] = 111] = "PackageKeyword";
+        SyntaxKind[SyntaxKind["PrivateKeyword"] = 112] = "PrivateKeyword";
+        SyntaxKind[SyntaxKind["ProtectedKeyword"] = 113] = "ProtectedKeyword";
+        SyntaxKind[SyntaxKind["PublicKeyword"] = 114] = "PublicKeyword";
+        SyntaxKind[SyntaxKind["StaticKeyword"] = 115] = "StaticKeyword";
+        SyntaxKind[SyntaxKind["YieldKeyword"] = 116] = "YieldKeyword";
+        // Contextual keywords
+        SyntaxKind[SyntaxKind["AbstractKeyword"] = 117] = "AbstractKeyword";
+        SyntaxKind[SyntaxKind["AsKeyword"] = 118] = "AsKeyword";
+        SyntaxKind[SyntaxKind["AnyKeyword"] = 119] = "AnyKeyword";
+        SyntaxKind[SyntaxKind["AsyncKeyword"] = 120] = "AsyncKeyword";
+        SyntaxKind[SyntaxKind["AwaitKeyword"] = 121] = "AwaitKeyword";
+        SyntaxKind[SyntaxKind["BooleanKeyword"] = 122] = "BooleanKeyword";
+        SyntaxKind[SyntaxKind["ConstructorKeyword"] = 123] = "ConstructorKeyword";
+        SyntaxKind[SyntaxKind["DeclareKeyword"] = 124] = "DeclareKeyword";
+        SyntaxKind[SyntaxKind["GetKeyword"] = 125] = "GetKeyword";
+        SyntaxKind[SyntaxKind["InferKeyword"] = 126] = "InferKeyword";
+        SyntaxKind[SyntaxKind["IsKeyword"] = 127] = "IsKeyword";
+        SyntaxKind[SyntaxKind["KeyOfKeyword"] = 128] = "KeyOfKeyword";
+        SyntaxKind[SyntaxKind["ModuleKeyword"] = 129] = "ModuleKeyword";
+        SyntaxKind[SyntaxKind["NamespaceKeyword"] = 130] = "NamespaceKeyword";
+        SyntaxKind[SyntaxKind["NeverKeyword"] = 131] = "NeverKeyword";
+        SyntaxKind[SyntaxKind["ReadonlyKeyword"] = 132] = "ReadonlyKeyword";
+        SyntaxKind[SyntaxKind["RequireKeyword"] = 133] = "RequireKeyword";
+        SyntaxKind[SyntaxKind["NumberKeyword"] = 134] = "NumberKeyword";
+        SyntaxKind[SyntaxKind["ObjectKeyword"] = 135] = "ObjectKeyword";
+        SyntaxKind[SyntaxKind["SetKeyword"] = 136] = "SetKeyword";
+        SyntaxKind[SyntaxKind["StringKeyword"] = 137] = "StringKeyword";
+        SyntaxKind[SyntaxKind["SymbolKeyword"] = 138] = "SymbolKeyword";
+        SyntaxKind[SyntaxKind["TypeKeyword"] = 139] = "TypeKeyword";
+        SyntaxKind[SyntaxKind["UndefinedKeyword"] = 140] = "UndefinedKeyword";
+        SyntaxKind[SyntaxKind["UniqueKeyword"] = 141] = "UniqueKeyword";
+        SyntaxKind[SyntaxKind["UnknownKeyword"] = 142] = "UnknownKeyword";
+        SyntaxKind[SyntaxKind["FromKeyword"] = 143] = "FromKeyword";
+        SyntaxKind[SyntaxKind["GlobalKeyword"] = 144] = "GlobalKeyword";
+        SyntaxKind[SyntaxKind["OfKeyword"] = 145] = "OfKeyword";
+        // Parse tree nodes
+        // Names
+        SyntaxKind[SyntaxKind["QualifiedName"] = 146] = "QualifiedName";
+        SyntaxKind[SyntaxKind["ComputedPropertyName"] = 147] = "ComputedPropertyName";
+        // Signature elements
+        SyntaxKind[SyntaxKind["TypeParameter"] = 148] = "TypeParameter";
+        SyntaxKind[SyntaxKind["Parameter"] = 149] = "Parameter";
+        SyntaxKind[SyntaxKind["Decorator"] = 150] = "Decorator";
+        // TypeMember
+        SyntaxKind[SyntaxKind["PropertySignature"] = 151] = "PropertySignature";
+        SyntaxKind[SyntaxKind["PropertyDeclaration"] = 152] = "PropertyDeclaration";
+        SyntaxKind[SyntaxKind["MethodSignature"] = 153] = "MethodSignature";
+        SyntaxKind[SyntaxKind["MethodDeclaration"] = 154] = "MethodDeclaration";
+        SyntaxKind[SyntaxKind["Constructor"] = 155] = "Constructor";
+        SyntaxKind[SyntaxKind["GetAccessor"] = 156] = "GetAccessor";
+        SyntaxKind[SyntaxKind["SetAccessor"] = 157] = "SetAccessor";
+        SyntaxKind[SyntaxKind["CallSignature"] = 158] = "CallSignature";
+        SyntaxKind[SyntaxKind["ConstructSignature"] = 159] = "ConstructSignature";
+        SyntaxKind[SyntaxKind["IndexSignature"] = 160] = "IndexSignature";
+        // Type
+        SyntaxKind[SyntaxKind["TypePredicate"] = 161] = "TypePredicate";
+        SyntaxKind[SyntaxKind["TypeReference"] = 162] = "TypeReference";
+        SyntaxKind[SyntaxKind["FunctionType"] = 163] = "FunctionType";
+        SyntaxKind[SyntaxKind["ConstructorType"] = 164] = "ConstructorType";
+        SyntaxKind[SyntaxKind["TypeQuery"] = 165] = "TypeQuery";
+        SyntaxKind[SyntaxKind["TypeLiteral"] = 166] = "TypeLiteral";
+        SyntaxKind[SyntaxKind["ArrayType"] = 167] = "ArrayType";
+        SyntaxKind[SyntaxKind["TupleType"] = 168] = "TupleType";
+        SyntaxKind[SyntaxKind["UnionType"] = 169] = "UnionType";
+        SyntaxKind[SyntaxKind["IntersectionType"] = 170] = "IntersectionType";
+        SyntaxKind[SyntaxKind["ConditionalType"] = 171] = "ConditionalType";
+        SyntaxKind[SyntaxKind["InferType"] = 172] = "InferType";
+        SyntaxKind[SyntaxKind["ParenthesizedType"] = 173] = "ParenthesizedType";
+        SyntaxKind[SyntaxKind["ThisType"] = 174] = "ThisType";
+        SyntaxKind[SyntaxKind["TypeOperator"] = 175] = "TypeOperator";
+        SyntaxKind[SyntaxKind["IndexedAccessType"] = 176] = "IndexedAccessType";
+        SyntaxKind[SyntaxKind["MappedType"] = 177] = "MappedType";
+        SyntaxKind[SyntaxKind["LiteralType"] = 178] = "LiteralType";
+        SyntaxKind[SyntaxKind["ImportType"] = 179] = "ImportType";
+        // Binding patterns
+        SyntaxKind[SyntaxKind["ObjectBindingPattern"] = 180] = "ObjectBindingPattern";
+        SyntaxKind[SyntaxKind["ArrayBindingPattern"] = 181] = "ArrayBindingPattern";
+        SyntaxKind[SyntaxKind["BindingElement"] = 182] = "BindingElement";
+        // Expression
+        SyntaxKind[SyntaxKind["ArrayLiteralExpression"] = 183] = "ArrayLiteralExpression";
+        SyntaxKind[SyntaxKind["ObjectLiteralExpression"] = 184] = "ObjectLiteralExpression";
+        SyntaxKind[SyntaxKind["PropertyAccessExpression"] = 185] = "PropertyAccessExpression";
+        SyntaxKind[SyntaxKind["ElementAccessExpression"] = 186] = "ElementAccessExpression";
+        SyntaxKind[SyntaxKind["CallExpression"] = 187] = "CallExpression";
+        SyntaxKind[SyntaxKind["NewExpression"] = 188] = "NewExpression";
+        SyntaxKind[SyntaxKind["TaggedTemplateExpression"] = 189] = "TaggedTemplateExpression";
+        SyntaxKind[SyntaxKind["TypeAssertionExpression"] = 190] = "TypeAssertionExpression";
+        SyntaxKind[SyntaxKind["ParenthesizedExpression"] = 191] = "ParenthesizedExpression";
+        SyntaxKind[SyntaxKind["FunctionExpression"] = 192] = "FunctionExpression";
+        SyntaxKind[SyntaxKind["ArrowFunction"] = 193] = "ArrowFunction";
+        SyntaxKind[SyntaxKind["DeleteExpression"] = 194] = "DeleteExpression";
+        SyntaxKind[SyntaxKind["TypeOfExpression"] = 195] = "TypeOfExpression";
+        SyntaxKind[SyntaxKind["VoidExpression"] = 196] = "VoidExpression";
+        SyntaxKind[SyntaxKind["AwaitExpression"] = 197] = "AwaitExpression";
+        SyntaxKind[SyntaxKind["PrefixUnaryExpression"] = 198] = "PrefixUnaryExpression";
+        SyntaxKind[SyntaxKind["PostfixUnaryExpression"] = 199] = "PostfixUnaryExpression";
+        SyntaxKind[SyntaxKind["BinaryExpression"] = 200] = "BinaryExpression";
+        SyntaxKind[SyntaxKind["ConditionalExpression"] = 201] = "ConditionalExpression";
+        SyntaxKind[SyntaxKind["TemplateExpression"] = 202] = "TemplateExpression";
+        SyntaxKind[SyntaxKind["YieldExpression"] = 203] = "YieldExpression";
+        SyntaxKind[SyntaxKind["SpreadElement"] = 204] = "SpreadElement";
+        SyntaxKind[SyntaxKind["ClassExpression"] = 205] = "ClassExpression";
+        SyntaxKind[SyntaxKind["OmittedExpression"] = 206] = "OmittedExpression";
+        SyntaxKind[SyntaxKind["ExpressionWithTypeArguments"] = 207] = "ExpressionWithTypeArguments";
+        SyntaxKind[SyntaxKind["AsExpression"] = 208] = "AsExpression";
+        SyntaxKind[SyntaxKind["NonNullExpression"] = 209] = "NonNullExpression";
+        SyntaxKind[SyntaxKind["MetaProperty"] = 210] = "MetaProperty";
+        // Misc
+        SyntaxKind[SyntaxKind["TemplateSpan"] = 211] = "TemplateSpan";
+        SyntaxKind[SyntaxKind["SemicolonClassElement"] = 212] = "SemicolonClassElement";
+        // Element
+        SyntaxKind[SyntaxKind["Block"] = 213] = "Block";
+        SyntaxKind[SyntaxKind["VariableStatement"] = 214] = "VariableStatement";
+        SyntaxKind[SyntaxKind["EmptyStatement"] = 215] = "EmptyStatement";
+        SyntaxKind[SyntaxKind["ExpressionStatement"] = 216] = "ExpressionStatement";
+        SyntaxKind[SyntaxKind["IfStatement"] = 217] = "IfStatement";
+        SyntaxKind[SyntaxKind["DoStatement"] = 218] = "DoStatement";
+        SyntaxKind[SyntaxKind["WhileStatement"] = 219] = "WhileStatement";
+        SyntaxKind[SyntaxKind["ForStatement"] = 220] = "ForStatement";
+        SyntaxKind[SyntaxKind["ForInStatement"] = 221] = "ForInStatement";
+        SyntaxKind[SyntaxKind["ForOfStatement"] = 222] = "ForOfStatement";
+        SyntaxKind[SyntaxKind["ContinueStatement"] = 223] = "ContinueStatement";
+        SyntaxKind[SyntaxKind["BreakStatement"] = 224] = "BreakStatement";
+        SyntaxKind[SyntaxKind["ReturnStatement"] = 225] = "ReturnStatement";
+        SyntaxKind[SyntaxKind["WithStatement"] = 226] = "WithStatement";
+        SyntaxKind[SyntaxKind["SwitchStatement"] = 227] = "SwitchStatement";
+        SyntaxKind[SyntaxKind["LabeledStatement"] = 228] = "LabeledStatement";
+        SyntaxKind[SyntaxKind["ThrowStatement"] = 229] = "ThrowStatement";
+        SyntaxKind[SyntaxKind["TryStatement"] = 230] = "TryStatement";
+        SyntaxKind[SyntaxKind["DebuggerStatement"] = 231] = "DebuggerStatement";
+        SyntaxKind[SyntaxKind["VariableDeclaration"] = 232] = "VariableDeclaration";
+        SyntaxKind[SyntaxKind["VariableDeclarationList"] = 233] = "VariableDeclarationList";
+        SyntaxKind[SyntaxKind["FunctionDeclaration"] = 234] = "FunctionDeclaration";
+        SyntaxKind[SyntaxKind["ClassDeclaration"] = 235] = "ClassDeclaration";
+        SyntaxKind[SyntaxKind["InterfaceDeclaration"] = 236] = "InterfaceDeclaration";
+        SyntaxKind[SyntaxKind["TypeAliasDeclaration"] = 237] = "TypeAliasDeclaration";
+        SyntaxKind[SyntaxKind["EnumDeclaration"] = 238] = "EnumDeclaration";
+        SyntaxKind[SyntaxKind["ModuleDeclaration"] = 239] = "ModuleDeclaration";
+        SyntaxKind[SyntaxKind["ModuleBlock"] = 240] = "ModuleBlock";
+        SyntaxKind[SyntaxKind["CaseBlock"] = 241] = "CaseBlock";
+        SyntaxKind[SyntaxKind["NamespaceExportDeclaration"] = 242] = "NamespaceExportDeclaration";
+        SyntaxKind[SyntaxKind["ImportEqualsDeclaration"] = 243] = "ImportEqualsDeclaration";
+        SyntaxKind[SyntaxKind["ImportDeclaration"] = 244] = "ImportDeclaration";
+        SyntaxKind[SyntaxKind["ImportClause"] = 245] = "ImportClause";
+        SyntaxKind[SyntaxKind["NamespaceImport"] = 246] = "NamespaceImport";
+        SyntaxKind[SyntaxKind["NamedImports"] = 247] = "NamedImports";
+        SyntaxKind[SyntaxKind["ImportSpecifier"] = 248] = "ImportSpecifier";
+        SyntaxKind[SyntaxKind["ExportAssignment"] = 249] = "ExportAssignment";
+        SyntaxKind[SyntaxKind["ExportDeclaration"] = 250] = "ExportDeclaration";
+        SyntaxKind[SyntaxKind["NamedExports"] = 251] = "NamedExports";
+        SyntaxKind[SyntaxKind["ExportSpecifier"] = 252] = "ExportSpecifier";
+        SyntaxKind[SyntaxKind["MissingDeclaration"] = 253] = "MissingDeclaration";
+        // Module references
+        SyntaxKind[SyntaxKind["ExternalModuleReference"] = 254] = "ExternalModuleReference";
+        // JSX
+        SyntaxKind[SyntaxKind["JsxElement"] = 255] = "JsxElement";
+        SyntaxKind[SyntaxKind["JsxSelfClosingElement"] = 256] = "JsxSelfClosingElement";
+        SyntaxKind[SyntaxKind["JsxOpeningElement"] = 257] = "JsxOpeningElement";
+        SyntaxKind[SyntaxKind["JsxClosingElement"] = 258] = "JsxClosingElement";
+        SyntaxKind[SyntaxKind["JsxFragment"] = 259] = "JsxFragment";
+        SyntaxKind[SyntaxKind["JsxOpeningFragment"] = 260] = "JsxOpeningFragment";
+        SyntaxKind[SyntaxKind["JsxClosingFragment"] = 261] = "JsxClosingFragment";
+        SyntaxKind[SyntaxKind["JsxAttribute"] = 262] = "JsxAttribute";
+        SyntaxKind[SyntaxKind["JsxAttributes"] = 263] = "JsxAttributes";
+        SyntaxKind[SyntaxKind["JsxSpreadAttribute"] = 264] = "JsxSpreadAttribute";
+        SyntaxKind[SyntaxKind["JsxExpression"] = 265] = "JsxExpression";
+        // Clauses
+        SyntaxKind[SyntaxKind["CaseClause"] = 266] = "CaseClause";
+        SyntaxKind[SyntaxKind["DefaultClause"] = 267] = "DefaultClause";
+        SyntaxKind[SyntaxKind["HeritageClause"] = 268] = "HeritageClause";
+        SyntaxKind[SyntaxKind["CatchClause"] = 269] = "CatchClause";
+        // Property assignments
+        SyntaxKind[SyntaxKind["PropertyAssignment"] = 270] = "PropertyAssignment";
+        SyntaxKind[SyntaxKind["ShorthandPropertyAssignment"] = 271] = "ShorthandPropertyAssignment";
+        SyntaxKind[SyntaxKind["SpreadAssignment"] = 272] = "SpreadAssignment";
+        // Enum
+        SyntaxKind[SyntaxKind["EnumMember"] = 273] = "EnumMember";
+        // Top-level nodes
+        SyntaxKind[SyntaxKind["SourceFile"] = 274] = "SourceFile";
+        SyntaxKind[SyntaxKind["Bundle"] = 275] = "Bundle";
+        SyntaxKind[SyntaxKind["UnparsedSource"] = 276] = "UnparsedSource";
+        SyntaxKind[SyntaxKind["InputFiles"] = 277] = "InputFiles";
+        // JSDoc nodes
+        SyntaxKind[SyntaxKind["JSDocTypeExpression"] = 278] = "JSDocTypeExpression";
+        // The * type
+        SyntaxKind[SyntaxKind["JSDocAllType"] = 279] = "JSDocAllType";
+        // The ? type
+        SyntaxKind[SyntaxKind["JSDocUnknownType"] = 280] = "JSDocUnknownType";
+        SyntaxKind[SyntaxKind["JSDocNullableType"] = 281] = "JSDocNullableType";
+        SyntaxKind[SyntaxKind["JSDocNonNullableType"] = 282] = "JSDocNonNullableType";
+        SyntaxKind[SyntaxKind["JSDocOptionalType"] = 283] = "JSDocOptionalType";
+        SyntaxKind[SyntaxKind["JSDocFunctionType"] = 284] = "JSDocFunctionType";
+        SyntaxKind[SyntaxKind["JSDocVariadicType"] = 285] = "JSDocVariadicType";
+        SyntaxKind[SyntaxKind["JSDocComment"] = 286] = "JSDocComment";
+        SyntaxKind[SyntaxKind["JSDocTypeLiteral"] = 287] = "JSDocTypeLiteral";
+        SyntaxKind[SyntaxKind["JSDocSignature"] = 288] = "JSDocSignature";
+        SyntaxKind[SyntaxKind["JSDocTag"] = 289] = "JSDocTag";
+        SyntaxKind[SyntaxKind["JSDocAugmentsTag"] = 290] = "JSDocAugmentsTag";
+        SyntaxKind[SyntaxKind["JSDocClassTag"] = 291] = "JSDocClassTag";
+        SyntaxKind[SyntaxKind["JSDocCallbackTag"] = 292] = "JSDocCallbackTag";
+        SyntaxKind[SyntaxKind["JSDocParameterTag"] = 293] = "JSDocParameterTag";
+        SyntaxKind[SyntaxKind["JSDocReturnTag"] = 294] = "JSDocReturnTag";
+        SyntaxKind[SyntaxKind["JSDocTypeTag"] = 295] = "JSDocTypeTag";
+        SyntaxKind[SyntaxKind["JSDocTemplateTag"] = 296] = "JSDocTemplateTag";
+        SyntaxKind[SyntaxKind["JSDocTypedefTag"] = 297] = "JSDocTypedefTag";
+        SyntaxKind[SyntaxKind["JSDocPropertyTag"] = 298] = "JSDocPropertyTag";
+        // Synthesized list
+        SyntaxKind[SyntaxKind["SyntaxList"] = 299] = "SyntaxList";
+        // Transformation nodes
+        SyntaxKind[SyntaxKind["NotEmittedStatement"] = 300] = "NotEmittedStatement";
+        SyntaxKind[SyntaxKind["PartiallyEmittedExpression"] = 301] = "PartiallyEmittedExpression";
+        SyntaxKind[SyntaxKind["CommaListExpression"] = 302] = "CommaListExpression";
+        SyntaxKind[SyntaxKind["MergeDeclarationMarker"] = 303] = "MergeDeclarationMarker";
+        SyntaxKind[SyntaxKind["EndOfDeclarationMarker"] = 304] = "EndOfDeclarationMarker";
+        // Enum value count
+        SyntaxKind[SyntaxKind["Count"] = 305] = "Count";
+        // Markers
+        SyntaxKind[SyntaxKind["FirstAssignment"] = 58] = "FirstAssignment";
+        SyntaxKind[SyntaxKind["LastAssignment"] = 70] = "LastAssignment";
+        SyntaxKind[SyntaxKind["FirstCompoundAssignment"] = 59] = "FirstCompoundAssignment";
+        SyntaxKind[SyntaxKind["LastCompoundAssignment"] = 70] = "LastCompoundAssignment";
+        SyntaxKind[SyntaxKind["FirstReservedWord"] = 72] = "FirstReservedWord";
+        SyntaxKind[SyntaxKind["LastReservedWord"] = 107] = "LastReservedWord";
+        SyntaxKind[SyntaxKind["FirstKeyword"] = 72] = "FirstKeyword";
+        SyntaxKind[SyntaxKind["LastKeyword"] = 145] = "LastKeyword";
+        SyntaxKind[SyntaxKind["FirstFutureReservedWord"] = 108] = "FirstFutureReservedWord";
+        SyntaxKind[SyntaxKind["LastFutureReservedWord"] = 116] = "LastFutureReservedWord";
+        SyntaxKind[SyntaxKind["FirstTypeNode"] = 161] = "FirstTypeNode";
+        SyntaxKind[SyntaxKind["LastTypeNode"] = 179] = "LastTypeNode";
+        SyntaxKind[SyntaxKind["FirstPunctuation"] = 17] = "FirstPunctuation";
+        SyntaxKind[SyntaxKind["LastPunctuation"] = 70] = "LastPunctuation";
+        SyntaxKind[SyntaxKind["FirstToken"] = 0] = "FirstToken";
+        SyntaxKind[SyntaxKind["LastToken"] = 145] = "LastToken";
+        SyntaxKind[SyntaxKind["FirstTriviaToken"] = 2] = "FirstTriviaToken";
+        SyntaxKind[SyntaxKind["LastTriviaToken"] = 7] = "LastTriviaToken";
+        SyntaxKind[SyntaxKind["FirstLiteralToken"] = 8] = "FirstLiteralToken";
+        SyntaxKind[SyntaxKind["LastLiteralToken"] = 13] = "LastLiteralToken";
+        SyntaxKind[SyntaxKind["FirstTemplateToken"] = 13] = "FirstTemplateToken";
+        SyntaxKind[SyntaxKind["LastTemplateToken"] = 16] = "LastTemplateToken";
+        SyntaxKind[SyntaxKind["FirstBinaryOperator"] = 27] = "FirstBinaryOperator";
+        SyntaxKind[SyntaxKind["LastBinaryOperator"] = 70] = "LastBinaryOperator";
+        SyntaxKind[SyntaxKind["FirstNode"] = 146] = "FirstNode";
+        SyntaxKind[SyntaxKind["FirstJSDocNode"] = 278] = "FirstJSDocNode";
+        SyntaxKind[SyntaxKind["LastJSDocNode"] = 298] = "LastJSDocNode";
+        SyntaxKind[SyntaxKind["FirstJSDocTagNode"] = 289] = "FirstJSDocTagNode";
+        SyntaxKind[SyntaxKind["LastJSDocTagNode"] = 298] = "LastJSDocTagNode";
+        /* @internal */ SyntaxKind[SyntaxKind["FirstContextualKeyword"] = 117] = "FirstContextualKeyword";
+        /* @internal */ SyntaxKind[SyntaxKind["LastContextualKeyword"] = 145] = "LastContextualKeyword";
+    })(SyntaxKind = ts.SyntaxKind || (ts.SyntaxKind = {}));
+    var NodeFlags;
+    (function (NodeFlags) {
+        NodeFlags[NodeFlags["None"] = 0] = "None";
+        NodeFlags[NodeFlags["Let"] = 1] = "Let";
+        NodeFlags[NodeFlags["Const"] = 2] = "Const";
+        NodeFlags[NodeFlags["NestedNamespace"] = 4] = "NestedNamespace";
+        NodeFlags[NodeFlags["Synthesized"] = 8] = "Synthesized";
+        NodeFlags[NodeFlags["Namespace"] = 16] = "Namespace";
+        NodeFlags[NodeFlags["ExportContext"] = 32] = "ExportContext";
+        NodeFlags[NodeFlags["ContainsThis"] = 64] = "ContainsThis";
+        NodeFlags[NodeFlags["HasImplicitReturn"] = 128] = "HasImplicitReturn";
+        NodeFlags[NodeFlags["HasExplicitReturn"] = 256] = "HasExplicitReturn";
+        NodeFlags[NodeFlags["GlobalAugmentation"] = 512] = "GlobalAugmentation";
+        NodeFlags[NodeFlags["HasAsyncFunctions"] = 1024] = "HasAsyncFunctions";
+        NodeFlags[NodeFlags["DisallowInContext"] = 2048] = "DisallowInContext";
+        NodeFlags[NodeFlags["YieldContext"] = 4096] = "YieldContext";
+        NodeFlags[NodeFlags["DecoratorContext"] = 8192] = "DecoratorContext";
+        NodeFlags[NodeFlags["AwaitContext"] = 16384] = "AwaitContext";
+        NodeFlags[NodeFlags["ThisNodeHasError"] = 32768] = "ThisNodeHasError";
+        NodeFlags[NodeFlags["JavaScriptFile"] = 65536] = "JavaScriptFile";
+        NodeFlags[NodeFlags["ThisNodeOrAnySubNodesHasError"] = 131072] = "ThisNodeOrAnySubNodesHasError";
+        NodeFlags[NodeFlags["HasAggregatedChildData"] = 262144] = "HasAggregatedChildData";
+        // These flags will be set when the parser encounters a dynamic import expression or 'import.meta' to avoid
+        // walking the tree if the flags are not set. However, these flags are just a approximation
+        // (hence why it's named "PossiblyContainsDynamicImport") because once set, the flags never get cleared.
+        // During editing, if a dynamic import is removed, incremental parsing will *NOT* clear this flag.
+        // This means that the tree will always be traversed during module resolution, or when looking for external module indicators.
+        // However, the removal operation should not occur often and in the case of the
+        // removal, it is likely that users will add the import anyway.
+        // The advantage of this approach is its simplicity. For the case of batch compilation,
+        // we guarantee that users won't have to pay the price of walking the tree if a dynamic import isn't used.
+        /* @internal */ NodeFlags[NodeFlags["PossiblyContainsDynamicImport"] = 524288] = "PossiblyContainsDynamicImport";
+        /* @internal */ NodeFlags[NodeFlags["PossiblyContainsImportMeta"] = 1048576] = "PossiblyContainsImportMeta";
+        NodeFlags[NodeFlags["JSDoc"] = 2097152] = "JSDoc";
+        /* @internal */ NodeFlags[NodeFlags["Ambient"] = 4194304] = "Ambient";
+        /* @internal */ NodeFlags[NodeFlags["InWithStatement"] = 8388608] = "InWithStatement";
+        NodeFlags[NodeFlags["JsonFile"] = 16777216] = "JsonFile";
+        NodeFlags[NodeFlags["BlockScoped"] = 3] = "BlockScoped";
+        NodeFlags[NodeFlags["ReachabilityCheckFlags"] = 384] = "ReachabilityCheckFlags";
+        NodeFlags[NodeFlags["ReachabilityAndEmitFlags"] = 1408] = "ReachabilityAndEmitFlags";
+        // Parsing context flags
+        NodeFlags[NodeFlags["ContextFlags"] = 12679168] = "ContextFlags";
+        // Exclude these flags when parsing a Type
+        NodeFlags[NodeFlags["TypeExcludesFlags"] = 20480] = "TypeExcludesFlags";
+        // Represents all flags that are potentially set once and
+        // never cleared on SourceFiles which get re-used in between incremental parses.
+        // See the comment above on `PossiblyContainsDynamicImport` and `PossiblyContainsImportMeta`.
+        /* @internal */ NodeFlags[NodeFlags["PermanentlySetIncrementalFlags"] = 1572864] = "PermanentlySetIncrementalFlags";
+    })(NodeFlags = ts.NodeFlags || (ts.NodeFlags = {}));
+    var ModifierFlags;
+    (function (ModifierFlags) {
+        ModifierFlags[ModifierFlags["None"] = 0] = "None";
+        ModifierFlags[ModifierFlags["Export"] = 1] = "Export";
+        ModifierFlags[ModifierFlags["Ambient"] = 2] = "Ambient";
+        ModifierFlags[ModifierFlags["Public"] = 4] = "Public";
+        ModifierFlags[ModifierFlags["Private"] = 8] = "Private";
+        ModifierFlags[ModifierFlags["Protected"] = 16] = "Protected";
+        ModifierFlags[ModifierFlags["Static"] = 32] = "Static";
+        ModifierFlags[ModifierFlags["Readonly"] = 64] = "Readonly";
+        ModifierFlags[ModifierFlags["Abstract"] = 128] = "Abstract";
+        ModifierFlags[ModifierFlags["Async"] = 256] = "Async";
+        ModifierFlags[ModifierFlags["Default"] = 512] = "Default";
+        ModifierFlags[ModifierFlags["Const"] = 2048] = "Const";
+        ModifierFlags[ModifierFlags["HasComputedFlags"] = 536870912] = "HasComputedFlags";
+        ModifierFlags[ModifierFlags["AccessibilityModifier"] = 28] = "AccessibilityModifier";
+        // Accessibility modifiers and 'readonly' can be attached to a parameter in a constructor to make it a property.
+        ModifierFlags[ModifierFlags["ParameterPropertyModifier"] = 92] = "ParameterPropertyModifier";
+        ModifierFlags[ModifierFlags["NonPublicAccessibilityModifier"] = 24] = "NonPublicAccessibilityModifier";
+        ModifierFlags[ModifierFlags["TypeScriptModifier"] = 2270] = "TypeScriptModifier";
+        ModifierFlags[ModifierFlags["ExportDefault"] = 513] = "ExportDefault";
+        ModifierFlags[ModifierFlags["All"] = 3071] = "All";
+    })(ModifierFlags = ts.ModifierFlags || (ts.ModifierFlags = {}));
+    var JsxFlags;
+    (function (JsxFlags) {
+        JsxFlags[JsxFlags["None"] = 0] = "None";
+        /** An element from a named property of the JSX.IntrinsicElements interface */
+        JsxFlags[JsxFlags["IntrinsicNamedElement"] = 1] = "IntrinsicNamedElement";
+        /** An element inferred from the string index signature of the JSX.IntrinsicElements interface */
+        JsxFlags[JsxFlags["IntrinsicIndexedElement"] = 2] = "IntrinsicIndexedElement";
+        JsxFlags[JsxFlags["IntrinsicElement"] = 3] = "IntrinsicElement";
+    })(JsxFlags = ts.JsxFlags || (ts.JsxFlags = {}));
+    /* @internal */
+    var RelationComparisonResult;
+    (function (RelationComparisonResult) {
+        RelationComparisonResult[RelationComparisonResult["Succeeded"] = 1] = "Succeeded";
+        RelationComparisonResult[RelationComparisonResult["Failed"] = 2] = "Failed";
+        RelationComparisonResult[RelationComparisonResult["FailedAndReported"] = 3] = "FailedAndReported";
+    })(RelationComparisonResult = ts.RelationComparisonResult || (ts.RelationComparisonResult = {}));
+    /*@internal*/
+    var GeneratedIdentifierFlags;
+    (function (GeneratedIdentifierFlags) {
+        // Kinds
+        GeneratedIdentifierFlags[GeneratedIdentifierFlags["None"] = 0] = "None";
+        GeneratedIdentifierFlags[GeneratedIdentifierFlags["Auto"] = 1] = "Auto";
+        GeneratedIdentifierFlags[GeneratedIdentifierFlags["Loop"] = 2] = "Loop";
+        GeneratedIdentifierFlags[GeneratedIdentifierFlags["Unique"] = 3] = "Unique";
+        GeneratedIdentifierFlags[GeneratedIdentifierFlags["Node"] = 4] = "Node";
+        GeneratedIdentifierFlags[GeneratedIdentifierFlags["KindMask"] = 7] = "KindMask";
+        // Flags
+        GeneratedIdentifierFlags[GeneratedIdentifierFlags["ReservedInNestedScopes"] = 8] = "ReservedInNestedScopes";
+        GeneratedIdentifierFlags[GeneratedIdentifierFlags["Optimistic"] = 16] = "Optimistic";
+        GeneratedIdentifierFlags[GeneratedIdentifierFlags["FileLevel"] = 32] = "FileLevel";
+    })(GeneratedIdentifierFlags = ts.GeneratedIdentifierFlags || (ts.GeneratedIdentifierFlags = {}));
+    /* @internal */
+    var TokenFlags;
+    (function (TokenFlags) {
+        TokenFlags[TokenFlags["None"] = 0] = "None";
+        TokenFlags[TokenFlags["PrecedingLineBreak"] = 1] = "PrecedingLineBreak";
+        TokenFlags[TokenFlags["PrecedingJSDocComment"] = 2] = "PrecedingJSDocComment";
+        TokenFlags[TokenFlags["Unterminated"] = 4] = "Unterminated";
+        TokenFlags[TokenFlags["ExtendedUnicodeEscape"] = 8] = "ExtendedUnicodeEscape";
+        TokenFlags[TokenFlags["Scientific"] = 16] = "Scientific";
+        TokenFlags[TokenFlags["Octal"] = 32] = "Octal";
+        TokenFlags[TokenFlags["HexSpecifier"] = 64] = "HexSpecifier";
+        TokenFlags[TokenFlags["BinarySpecifier"] = 128] = "BinarySpecifier";
+        TokenFlags[TokenFlags["OctalSpecifier"] = 256] = "OctalSpecifier";
+        TokenFlags[TokenFlags["ContainsSeparator"] = 512] = "ContainsSeparator";
+        TokenFlags[TokenFlags["BinaryOrOctalSpecifier"] = 384] = "BinaryOrOctalSpecifier";
+        TokenFlags[TokenFlags["NumericLiteralFlags"] = 1008] = "NumericLiteralFlags";
+    })(TokenFlags = ts.TokenFlags || (ts.TokenFlags = {}));
+    var FlowFlags;
+    (function (FlowFlags) {
+        FlowFlags[FlowFlags["Unreachable"] = 1] = "Unreachable";
+        FlowFlags[FlowFlags["Start"] = 2] = "Start";
+        FlowFlags[FlowFlags["BranchLabel"] = 4] = "BranchLabel";
+        FlowFlags[FlowFlags["LoopLabel"] = 8] = "LoopLabel";
+        FlowFlags[FlowFlags["Assignment"] = 16] = "Assignment";
+        FlowFlags[FlowFlags["TrueCondition"] = 32] = "TrueCondition";
+        FlowFlags[FlowFlags["FalseCondition"] = 64] = "FalseCondition";
+        FlowFlags[FlowFlags["SwitchClause"] = 128] = "SwitchClause";
+        FlowFlags[FlowFlags["ArrayMutation"] = 256] = "ArrayMutation";
+        FlowFlags[FlowFlags["Referenced"] = 512] = "Referenced";
+        FlowFlags[FlowFlags["Shared"] = 1024] = "Shared";
+        FlowFlags[FlowFlags["PreFinally"] = 2048] = "PreFinally";
+        FlowFlags[FlowFlags["AfterFinally"] = 4096] = "AfterFinally";
+        FlowFlags[FlowFlags["Label"] = 12] = "Label";
+        FlowFlags[FlowFlags["Condition"] = 96] = "Condition";
+    })(FlowFlags = ts.FlowFlags || (ts.FlowFlags = {}));
+    var OperationCanceledException = /** @class */ (function () {
+        function OperationCanceledException() {
+        }
+        return OperationCanceledException;
+    }());
+    ts.OperationCanceledException = OperationCanceledException;
+    /* @internal */
+    var StructureIsReused;
+    (function (StructureIsReused) {
+        StructureIsReused[StructureIsReused["Not"] = 0] = "Not";
+        StructureIsReused[StructureIsReused["SafeModules"] = 1] = "SafeModules";
+        StructureIsReused[StructureIsReused["Completely"] = 2] = "Completely";
+    })(StructureIsReused = ts.StructureIsReused || (ts.StructureIsReused = {}));
+    /** Return code used by getEmitOutput function to indicate status of the function */
+    var ExitStatus;
+    (function (ExitStatus) {
+        // Compiler ran successfully.  Either this was a simple do-nothing compilation (for example,
+        // when -version or -help was provided, or this was a normal compilation, no diagnostics
+        // were produced, and all outputs were generated successfully.
+        ExitStatus[ExitStatus["Success"] = 0] = "Success";
+        // Diagnostics were produced and because of them no code was generated.
+        ExitStatus[ExitStatus["DiagnosticsPresent_OutputsSkipped"] = 1] = "DiagnosticsPresent_OutputsSkipped";
+        // Diagnostics were produced and outputs were generated in spite of them.
+        ExitStatus[ExitStatus["DiagnosticsPresent_OutputsGenerated"] = 2] = "DiagnosticsPresent_OutputsGenerated";
+    })(ExitStatus = ts.ExitStatus || (ts.ExitStatus = {}));
+    /* @internal */
+    var UnionReduction;
+    (function (UnionReduction) {
+        UnionReduction[UnionReduction["None"] = 0] = "None";
+        UnionReduction[UnionReduction["Literal"] = 1] = "Literal";
+        UnionReduction[UnionReduction["Subtype"] = 2] = "Subtype";
+    })(UnionReduction = ts.UnionReduction || (ts.UnionReduction = {}));
+    var NodeBuilderFlags;
+    (function (NodeBuilderFlags) {
+        NodeBuilderFlags[NodeBuilderFlags["None"] = 0] = "None";
+        // Options
+        NodeBuilderFlags[NodeBuilderFlags["NoTruncation"] = 1] = "NoTruncation";
+        NodeBuilderFlags[NodeBuilderFlags["WriteArrayAsGenericType"] = 2] = "WriteArrayAsGenericType";
+        NodeBuilderFlags[NodeBuilderFlags["GenerateNamesForShadowedTypeParams"] = 4] = "GenerateNamesForShadowedTypeParams";
+        NodeBuilderFlags[NodeBuilderFlags["UseStructuralFallback"] = 8] = "UseStructuralFallback";
+        NodeBuilderFlags[NodeBuilderFlags["ForbidIndexedAccessSymbolReferences"] = 16] = "ForbidIndexedAccessSymbolReferences";
+        NodeBuilderFlags[NodeBuilderFlags["WriteTypeArgumentsOfSignature"] = 32] = "WriteTypeArgumentsOfSignature";
+        NodeBuilderFlags[NodeBuilderFlags["UseFullyQualifiedType"] = 64] = "UseFullyQualifiedType";
+        NodeBuilderFlags[NodeBuilderFlags["UseOnlyExternalAliasing"] = 128] = "UseOnlyExternalAliasing";
+        NodeBuilderFlags[NodeBuilderFlags["SuppressAnyReturnType"] = 256] = "SuppressAnyReturnType";
+        NodeBuilderFlags[NodeBuilderFlags["WriteTypeParametersInQualifiedName"] = 512] = "WriteTypeParametersInQualifiedName";
+        NodeBuilderFlags[NodeBuilderFlags["MultilineObjectLiterals"] = 1024] = "MultilineObjectLiterals";
+        NodeBuilderFlags[NodeBuilderFlags["WriteClassExpressionAsTypeLiteral"] = 2048] = "WriteClassExpressionAsTypeLiteral";
+        NodeBuilderFlags[NodeBuilderFlags["UseTypeOfFunction"] = 4096] = "UseTypeOfFunction";
+        NodeBuilderFlags[NodeBuilderFlags["OmitParameterModifiers"] = 8192] = "OmitParameterModifiers";
+        NodeBuilderFlags[NodeBuilderFlags["UseAliasDefinedOutsideCurrentScope"] = 16384] = "UseAliasDefinedOutsideCurrentScope";
+        // Error handling
+        NodeBuilderFlags[NodeBuilderFlags["AllowThisInObjectLiteral"] = 32768] = "AllowThisInObjectLiteral";
+        NodeBuilderFlags[NodeBuilderFlags["AllowQualifedNameInPlaceOfIdentifier"] = 65536] = "AllowQualifedNameInPlaceOfIdentifier";
+        NodeBuilderFlags[NodeBuilderFlags["AllowAnonymousIdentifier"] = 131072] = "AllowAnonymousIdentifier";
+        NodeBuilderFlags[NodeBuilderFlags["AllowEmptyUnionOrIntersection"] = 262144] = "AllowEmptyUnionOrIntersection";
+        NodeBuilderFlags[NodeBuilderFlags["AllowEmptyTuple"] = 524288] = "AllowEmptyTuple";
+        NodeBuilderFlags[NodeBuilderFlags["AllowUniqueESSymbolType"] = 1048576] = "AllowUniqueESSymbolType";
+        NodeBuilderFlags[NodeBuilderFlags["AllowEmptyIndexInfoType"] = 2097152] = "AllowEmptyIndexInfoType";
+        NodeBuilderFlags[NodeBuilderFlags["IgnoreErrors"] = 3112960] = "IgnoreErrors";
+        // State
+        NodeBuilderFlags[NodeBuilderFlags["InObjectTypeLiteral"] = 4194304] = "InObjectTypeLiteral";
+        NodeBuilderFlags[NodeBuilderFlags["InTypeAlias"] = 8388608] = "InTypeAlias";
+        NodeBuilderFlags[NodeBuilderFlags["InInitialEntityName"] = 16777216] = "InInitialEntityName";
+        NodeBuilderFlags[NodeBuilderFlags["InReverseMappedType"] = 33554432] = "InReverseMappedType";
+    })(NodeBuilderFlags = ts.NodeBuilderFlags || (ts.NodeBuilderFlags = {}));
+    // Ensure the shared flags between this and `NodeBuilderFlags` stay in alignment
+    var TypeFormatFlags;
+    (function (TypeFormatFlags) {
+        TypeFormatFlags[TypeFormatFlags["None"] = 0] = "None";
+        TypeFormatFlags[TypeFormatFlags["NoTruncation"] = 1] = "NoTruncation";
+        TypeFormatFlags[TypeFormatFlags["WriteArrayAsGenericType"] = 2] = "WriteArrayAsGenericType";
+        // hole because there's a hole in node builder flags
+        TypeFormatFlags[TypeFormatFlags["UseStructuralFallback"] = 8] = "UseStructuralFallback";
+        // hole because there's a hole in node builder flags
+        TypeFormatFlags[TypeFormatFlags["WriteTypeArgumentsOfSignature"] = 32] = "WriteTypeArgumentsOfSignature";
+        TypeFormatFlags[TypeFormatFlags["UseFullyQualifiedType"] = 64] = "UseFullyQualifiedType";
+        // hole because `UseOnlyExternalAliasing` is here in node builder flags, but functions which take old flags use `SymbolFormatFlags` instead
+        TypeFormatFlags[TypeFormatFlags["SuppressAnyReturnType"] = 256] = "SuppressAnyReturnType";
+        // hole because `WriteTypeParametersInQualifiedName` is here in node builder flags, but functions which take old flags use `SymbolFormatFlags` for this instead
+        TypeFormatFlags[TypeFormatFlags["MultilineObjectLiterals"] = 1024] = "MultilineObjectLiterals";
+        TypeFormatFlags[TypeFormatFlags["WriteClassExpressionAsTypeLiteral"] = 2048] = "WriteClassExpressionAsTypeLiteral";
+        TypeFormatFlags[TypeFormatFlags["UseTypeOfFunction"] = 4096] = "UseTypeOfFunction";
+        TypeFormatFlags[TypeFormatFlags["OmitParameterModifiers"] = 8192] = "OmitParameterModifiers";
+        TypeFormatFlags[TypeFormatFlags["UseAliasDefinedOutsideCurrentScope"] = 16384] = "UseAliasDefinedOutsideCurrentScope";
+        // even though `T` can't be accessed in the current scope.
+        // Error Handling
+        TypeFormatFlags[TypeFormatFlags["AllowUniqueESSymbolType"] = 1048576] = "AllowUniqueESSymbolType";
+        // TypeFormatFlags exclusive
+        TypeFormatFlags[TypeFormatFlags["AddUndefined"] = 131072] = "AddUndefined";
+        TypeFormatFlags[TypeFormatFlags["WriteArrowStyleSignature"] = 262144] = "WriteArrowStyleSignature";
+        // State
+        TypeFormatFlags[TypeFormatFlags["InArrayType"] = 524288] = "InArrayType";
+        TypeFormatFlags[TypeFormatFlags["InElementType"] = 2097152] = "InElementType";
+        TypeFormatFlags[TypeFormatFlags["InFirstTypeArgument"] = 4194304] = "InFirstTypeArgument";
+        TypeFormatFlags[TypeFormatFlags["InTypeAlias"] = 8388608] = "InTypeAlias";
+        /** @deprecated */ TypeFormatFlags[TypeFormatFlags["WriteOwnNameForAnyLike"] = 0] = "WriteOwnNameForAnyLike";
+        TypeFormatFlags[TypeFormatFlags["NodeBuilderFlagsMask"] = 9469291] = "NodeBuilderFlagsMask";
+    })(TypeFormatFlags = ts.TypeFormatFlags || (ts.TypeFormatFlags = {}));
+    var SymbolFormatFlags;
+    (function (SymbolFormatFlags) {
+        SymbolFormatFlags[SymbolFormatFlags["None"] = 0] = "None";
+        // Write symbols's type argument if it is instantiated symbol
+        // eg. class C<T> { p: T }   <-- Show p as C<T>.p here
+        //     var a: C<number>;
+        //     var p = a.p; <--- Here p is property of C<number> so show it as C<number>.p instead of just C.p
+        SymbolFormatFlags[SymbolFormatFlags["WriteTypeParametersOrArguments"] = 1] = "WriteTypeParametersOrArguments";
+        // Use only external alias information to get the symbol name in the given context
+        // eg.  module m { export class c { } } import x = m.c;
+        // When this flag is specified m.c will be used to refer to the class instead of alias symbol x
+        SymbolFormatFlags[SymbolFormatFlags["UseOnlyExternalAliasing"] = 2] = "UseOnlyExternalAliasing";
+        // Build symbol name using any nodes needed, instead of just components of an entity name
+        SymbolFormatFlags[SymbolFormatFlags["AllowAnyNodeKind"] = 4] = "AllowAnyNodeKind";
+        // Prefer aliases which are not directly visible
+        SymbolFormatFlags[SymbolFormatFlags["UseAliasDefinedOutsideCurrentScope"] = 8] = "UseAliasDefinedOutsideCurrentScope";
+    })(SymbolFormatFlags = ts.SymbolFormatFlags || (ts.SymbolFormatFlags = {}));
+    /* @internal */
+    var SymbolAccessibility;
+    (function (SymbolAccessibility) {
+        SymbolAccessibility[SymbolAccessibility["Accessible"] = 0] = "Accessible";
+        SymbolAccessibility[SymbolAccessibility["NotAccessible"] = 1] = "NotAccessible";
+        SymbolAccessibility[SymbolAccessibility["CannotBeNamed"] = 2] = "CannotBeNamed";
+    })(SymbolAccessibility = ts.SymbolAccessibility || (ts.SymbolAccessibility = {}));
+    /* @internal */
+    var SyntheticSymbolKind;
+    (function (SyntheticSymbolKind) {
+        SyntheticSymbolKind[SyntheticSymbolKind["UnionOrIntersection"] = 0] = "UnionOrIntersection";
+        SyntheticSymbolKind[SyntheticSymbolKind["Spread"] = 1] = "Spread";
+    })(SyntheticSymbolKind = ts.SyntheticSymbolKind || (ts.SyntheticSymbolKind = {}));
+    var TypePredicateKind;
+    (function (TypePredicateKind) {
+        TypePredicateKind[TypePredicateKind["This"] = 0] = "This";
+        TypePredicateKind[TypePredicateKind["Identifier"] = 1] = "Identifier";
+    })(TypePredicateKind = ts.TypePredicateKind || (ts.TypePredicateKind = {}));
+    /** Indicates how to serialize the name for a TypeReferenceNode when emitting decorator metadata */
+    /* @internal */
+    var TypeReferenceSerializationKind;
+    (function (TypeReferenceSerializationKind) {
+        TypeReferenceSerializationKind[TypeReferenceSerializationKind["Unknown"] = 0] = "Unknown";
+        // should be emitted using a safe fallback.
+        TypeReferenceSerializationKind[TypeReferenceSerializationKind["TypeWithConstructSignatureAndValue"] = 1] = "TypeWithConstructSignatureAndValue";
+        // function that can be reached at runtime (e.g. a `class`
+        // declaration or a `var` declaration for the static side
+        // of a type, such as the global `Promise` type in lib.d.ts).
+        TypeReferenceSerializationKind[TypeReferenceSerializationKind["VoidNullableOrNeverType"] = 2] = "VoidNullableOrNeverType";
+        TypeReferenceSerializationKind[TypeReferenceSerializationKind["NumberLikeType"] = 3] = "NumberLikeType";
+        TypeReferenceSerializationKind[TypeReferenceSerializationKind["StringLikeType"] = 4] = "StringLikeType";
+        TypeReferenceSerializationKind[TypeReferenceSerializationKind["BooleanType"] = 5] = "BooleanType";
+        TypeReferenceSerializationKind[TypeReferenceSerializationKind["ArrayLikeType"] = 6] = "ArrayLikeType";
+        TypeReferenceSerializationKind[TypeReferenceSerializationKind["ESSymbolType"] = 7] = "ESSymbolType";
+        TypeReferenceSerializationKind[TypeReferenceSerializationKind["Promise"] = 8] = "Promise";
+        TypeReferenceSerializationKind[TypeReferenceSerializationKind["TypeWithCallSignature"] = 9] = "TypeWithCallSignature";
+        // with call signatures.
+        TypeReferenceSerializationKind[TypeReferenceSerializationKind["ObjectType"] = 10] = "ObjectType";
+    })(TypeReferenceSerializationKind = ts.TypeReferenceSerializationKind || (ts.TypeReferenceSerializationKind = {}));
+    var SymbolFlags;
+    (function (SymbolFlags) {
+        SymbolFlags[SymbolFlags["None"] = 0] = "None";
+        SymbolFlags[SymbolFlags["FunctionScopedVariable"] = 1] = "FunctionScopedVariable";
+        SymbolFlags[SymbolFlags["BlockScopedVariable"] = 2] = "BlockScopedVariable";
+        SymbolFlags[SymbolFlags["Property"] = 4] = "Property";
+        SymbolFlags[SymbolFlags["EnumMember"] = 8] = "EnumMember";
+        SymbolFlags[SymbolFlags["Function"] = 16] = "Function";
+        SymbolFlags[SymbolFlags["Class"] = 32] = "Class";
+        SymbolFlags[SymbolFlags["Interface"] = 64] = "Interface";
+        SymbolFlags[SymbolFlags["ConstEnum"] = 128] = "ConstEnum";
+        SymbolFlags[SymbolFlags["RegularEnum"] = 256] = "RegularEnum";
+        SymbolFlags[SymbolFlags["ValueModule"] = 512] = "ValueModule";
+        SymbolFlags[SymbolFlags["NamespaceModule"] = 1024] = "NamespaceModule";
+        SymbolFlags[SymbolFlags["TypeLiteral"] = 2048] = "TypeLiteral";
+        SymbolFlags[SymbolFlags["ObjectLiteral"] = 4096] = "ObjectLiteral";
+        SymbolFlags[SymbolFlags["Method"] = 8192] = "Method";
+        SymbolFlags[SymbolFlags["Constructor"] = 16384] = "Constructor";
+        SymbolFlags[SymbolFlags["GetAccessor"] = 32768] = "GetAccessor";
+        SymbolFlags[SymbolFlags["SetAccessor"] = 65536] = "SetAccessor";
+        SymbolFlags[SymbolFlags["Signature"] = 131072] = "Signature";
+        SymbolFlags[SymbolFlags["TypeParameter"] = 262144] = "TypeParameter";
+        SymbolFlags[SymbolFlags["TypeAlias"] = 524288] = "TypeAlias";
+        SymbolFlags[SymbolFlags["ExportValue"] = 1048576] = "ExportValue";
+        SymbolFlags[SymbolFlags["Alias"] = 2097152] = "Alias";
+        SymbolFlags[SymbolFlags["Prototype"] = 4194304] = "Prototype";
+        SymbolFlags[SymbolFlags["ExportStar"] = 8388608] = "ExportStar";
+        SymbolFlags[SymbolFlags["Optional"] = 16777216] = "Optional";
+        SymbolFlags[SymbolFlags["Transient"] = 33554432] = "Transient";
+        SymbolFlags[SymbolFlags["JSContainer"] = 67108864] = "JSContainer";
+        /* @internal */
+        SymbolFlags[SymbolFlags["All"] = 67108863] = "All";
+        SymbolFlags[SymbolFlags["Enum"] = 384] = "Enum";
+        SymbolFlags[SymbolFlags["Variable"] = 3] = "Variable";
+        SymbolFlags[SymbolFlags["Value"] = 67216319] = "Value";
+        SymbolFlags[SymbolFlags["Type"] = 67901928] = "Type";
+        SymbolFlags[SymbolFlags["Namespace"] = 1920] = "Namespace";
+        SymbolFlags[SymbolFlags["Module"] = 1536] = "Module";
+        SymbolFlags[SymbolFlags["Accessor"] = 98304] = "Accessor";
+        // Variables can be redeclared, but can not redeclare a block-scoped declaration with the
+        // same name, or any other value that is not a variable, e.g. ValueModule or Class
+        SymbolFlags[SymbolFlags["FunctionScopedVariableExcludes"] = 67216318] = "FunctionScopedVariableExcludes";
+        // Block-scoped declarations are not allowed to be re-declared
+        // they can not merge with anything in the value space
+        SymbolFlags[SymbolFlags["BlockScopedVariableExcludes"] = 67216319] = "BlockScopedVariableExcludes";
+        SymbolFlags[SymbolFlags["ParameterExcludes"] = 67216319] = "ParameterExcludes";
+        SymbolFlags[SymbolFlags["PropertyExcludes"] = 0] = "PropertyExcludes";
+        SymbolFlags[SymbolFlags["EnumMemberExcludes"] = 68008959] = "EnumMemberExcludes";
+        SymbolFlags[SymbolFlags["FunctionExcludes"] = 67215791] = "FunctionExcludes";
+        SymbolFlags[SymbolFlags["ClassExcludes"] = 68008383] = "ClassExcludes";
+        SymbolFlags[SymbolFlags["InterfaceExcludes"] = 67901832] = "InterfaceExcludes";
+        SymbolFlags[SymbolFlags["RegularEnumExcludes"] = 68008191] = "RegularEnumExcludes";
+        SymbolFlags[SymbolFlags["ConstEnumExcludes"] = 68008831] = "ConstEnumExcludes";
+        SymbolFlags[SymbolFlags["ValueModuleExcludes"] = 67215503] = "ValueModuleExcludes";
+        SymbolFlags[SymbolFlags["NamespaceModuleExcludes"] = 0] = "NamespaceModuleExcludes";
+        SymbolFlags[SymbolFlags["MethodExcludes"] = 67208127] = "MethodExcludes";
+        SymbolFlags[SymbolFlags["GetAccessorExcludes"] = 67150783] = "GetAccessorExcludes";
+        SymbolFlags[SymbolFlags["SetAccessorExcludes"] = 67183551] = "SetAccessorExcludes";
+        SymbolFlags[SymbolFlags["TypeParameterExcludes"] = 67639784] = "TypeParameterExcludes";
+        SymbolFlags[SymbolFlags["TypeAliasExcludes"] = 67901928] = "TypeAliasExcludes";
+        SymbolFlags[SymbolFlags["AliasExcludes"] = 2097152] = "AliasExcludes";
+        SymbolFlags[SymbolFlags["ModuleMember"] = 2623475] = "ModuleMember";
+        SymbolFlags[SymbolFlags["ExportHasLocal"] = 944] = "ExportHasLocal";
+        SymbolFlags[SymbolFlags["HasExports"] = 1952] = "HasExports";
+        SymbolFlags[SymbolFlags["HasMembers"] = 6240] = "HasMembers";
+        SymbolFlags[SymbolFlags["BlockScoped"] = 418] = "BlockScoped";
+        SymbolFlags[SymbolFlags["PropertyOrAccessor"] = 98308] = "PropertyOrAccessor";
+        SymbolFlags[SymbolFlags["ClassMember"] = 106500] = "ClassMember";
+        /* @internal */
+        // The set of things we consider semantically classifiable.  Used to speed up the LS during
+        // classification.
+        SymbolFlags[SymbolFlags["Classifiable"] = 2885600] = "Classifiable";
+        /* @internal */
+        SymbolFlags[SymbolFlags["LateBindingContainer"] = 6240] = "LateBindingContainer";
+    })(SymbolFlags = ts.SymbolFlags || (ts.SymbolFlags = {}));
+    /* @internal */
+    var EnumKind;
+    (function (EnumKind) {
+        EnumKind[EnumKind["Numeric"] = 0] = "Numeric";
+        EnumKind[EnumKind["Literal"] = 1] = "Literal"; // Literal enum (each member has a TypeFlags.EnumLiteral type)
+    })(EnumKind = ts.EnumKind || (ts.EnumKind = {}));
+    /* @internal */
+    var CheckFlags;
+    (function (CheckFlags) {
+        CheckFlags[CheckFlags["Instantiated"] = 1] = "Instantiated";
+        CheckFlags[CheckFlags["SyntheticProperty"] = 2] = "SyntheticProperty";
+        CheckFlags[CheckFlags["SyntheticMethod"] = 4] = "SyntheticMethod";
+        CheckFlags[CheckFlags["Readonly"] = 8] = "Readonly";
+        CheckFlags[CheckFlags["Partial"] = 16] = "Partial";
+        CheckFlags[CheckFlags["HasNonUniformType"] = 32] = "HasNonUniformType";
+        CheckFlags[CheckFlags["ContainsPublic"] = 64] = "ContainsPublic";
+        CheckFlags[CheckFlags["ContainsProtected"] = 128] = "ContainsProtected";
+        CheckFlags[CheckFlags["ContainsPrivate"] = 256] = "ContainsPrivate";
+        CheckFlags[CheckFlags["ContainsStatic"] = 512] = "ContainsStatic";
+        CheckFlags[CheckFlags["Late"] = 1024] = "Late";
+        CheckFlags[CheckFlags["ReverseMapped"] = 2048] = "ReverseMapped";
+        CheckFlags[CheckFlags["Synthetic"] = 6] = "Synthetic";
+    })(CheckFlags = ts.CheckFlags || (ts.CheckFlags = {}));
+    var InternalSymbolName;
+    (function (InternalSymbolName) {
+        InternalSymbolName["Call"] = "__call";
+        InternalSymbolName["Constructor"] = "__constructor";
+        InternalSymbolName["New"] = "__new";
+        InternalSymbolName["Index"] = "__index";
+        InternalSymbolName["ExportStar"] = "__export";
+        InternalSymbolName["Global"] = "__global";
+        InternalSymbolName["Missing"] = "__missing";
+        InternalSymbolName["Type"] = "__type";
+        InternalSymbolName["Object"] = "__object";
+        InternalSymbolName["JSXAttributes"] = "__jsxAttributes";
+        InternalSymbolName["Class"] = "__class";
+        InternalSymbolName["Function"] = "__function";
+        InternalSymbolName["Computed"] = "__computed";
+        InternalSymbolName["Resolving"] = "__resolving__";
+        InternalSymbolName["ExportEquals"] = "export=";
+        InternalSymbolName["Default"] = "default";
+    })(InternalSymbolName = ts.InternalSymbolName || (ts.InternalSymbolName = {}));
+    /* @internal */
+    var NodeCheckFlags;
+    (function (NodeCheckFlags) {
+        NodeCheckFlags[NodeCheckFlags["TypeChecked"] = 1] = "TypeChecked";
+        NodeCheckFlags[NodeCheckFlags["LexicalThis"] = 2] = "LexicalThis";
+        NodeCheckFlags[NodeCheckFlags["CaptureThis"] = 4] = "CaptureThis";
+        NodeCheckFlags[NodeCheckFlags["CaptureNewTarget"] = 8] = "CaptureNewTarget";
+        NodeCheckFlags[NodeCheckFlags["SuperInstance"] = 256] = "SuperInstance";
+        NodeCheckFlags[NodeCheckFlags["SuperStatic"] = 512] = "SuperStatic";
+        NodeCheckFlags[NodeCheckFlags["ContextChecked"] = 1024] = "ContextChecked";
+        NodeCheckFlags[NodeCheckFlags["AsyncMethodWithSuper"] = 2048] = "AsyncMethodWithSuper";
+        NodeCheckFlags[NodeCheckFlags["AsyncMethodWithSuperBinding"] = 4096] = "AsyncMethodWithSuperBinding";
+        NodeCheckFlags[NodeCheckFlags["CaptureArguments"] = 8192] = "CaptureArguments";
+        NodeCheckFlags[NodeCheckFlags["EnumValuesComputed"] = 16384] = "EnumValuesComputed";
+        NodeCheckFlags[NodeCheckFlags["LexicalModuleMergesWithClass"] = 32768] = "LexicalModuleMergesWithClass";
+        NodeCheckFlags[NodeCheckFlags["LoopWithCapturedBlockScopedBinding"] = 65536] = "LoopWithCapturedBlockScopedBinding";
+        NodeCheckFlags[NodeCheckFlags["CapturedBlockScopedBinding"] = 131072] = "CapturedBlockScopedBinding";
+        NodeCheckFlags[NodeCheckFlags["BlockScopedBindingInLoop"] = 262144] = "BlockScopedBindingInLoop";
+        NodeCheckFlags[NodeCheckFlags["ClassWithBodyScopedClassBinding"] = 524288] = "ClassWithBodyScopedClassBinding";
+        NodeCheckFlags[NodeCheckFlags["BodyScopedClassBinding"] = 1048576] = "BodyScopedClassBinding";
+        NodeCheckFlags[NodeCheckFlags["NeedsLoopOutParameter"] = 2097152] = "NeedsLoopOutParameter";
+        NodeCheckFlags[NodeCheckFlags["AssignmentsMarked"] = 4194304] = "AssignmentsMarked";
+        NodeCheckFlags[NodeCheckFlags["ClassWithConstructorReference"] = 8388608] = "ClassWithConstructorReference";
+        NodeCheckFlags[NodeCheckFlags["ConstructorReferenceInClass"] = 16777216] = "ConstructorReferenceInClass";
+    })(NodeCheckFlags = ts.NodeCheckFlags || (ts.NodeCheckFlags = {}));
+    var TypeFlags;
+    (function (TypeFlags) {
+        TypeFlags[TypeFlags["Any"] = 1] = "Any";
+        TypeFlags[TypeFlags["Unknown"] = 2] = "Unknown";
+        TypeFlags[TypeFlags["String"] = 4] = "String";
+        TypeFlags[TypeFlags["Number"] = 8] = "Number";
+        TypeFlags[TypeFlags["Boolean"] = 16] = "Boolean";
+        TypeFlags[TypeFlags["Enum"] = 32] = "Enum";
+        TypeFlags[TypeFlags["StringLiteral"] = 64] = "StringLiteral";
+        TypeFlags[TypeFlags["NumberLiteral"] = 128] = "NumberLiteral";
+        TypeFlags[TypeFlags["BooleanLiteral"] = 256] = "BooleanLiteral";
+        TypeFlags[TypeFlags["EnumLiteral"] = 512] = "EnumLiteral";
+        TypeFlags[TypeFlags["ESSymbol"] = 1024] = "ESSymbol";
+        TypeFlags[TypeFlags["UniqueESSymbol"] = 2048] = "UniqueESSymbol";
+        TypeFlags[TypeFlags["Void"] = 4096] = "Void";
+        TypeFlags[TypeFlags["Undefined"] = 8192] = "Undefined";
+        TypeFlags[TypeFlags["Null"] = 16384] = "Null";
+        TypeFlags[TypeFlags["Never"] = 32768] = "Never";
+        TypeFlags[TypeFlags["TypeParameter"] = 65536] = "TypeParameter";
+        TypeFlags[TypeFlags["Object"] = 131072] = "Object";
+        TypeFlags[TypeFlags["Union"] = 262144] = "Union";
+        TypeFlags[TypeFlags["Intersection"] = 524288] = "Intersection";
+        TypeFlags[TypeFlags["Index"] = 1048576] = "Index";
+        TypeFlags[TypeFlags["IndexedAccess"] = 2097152] = "IndexedAccess";
+        TypeFlags[TypeFlags["Conditional"] = 4194304] = "Conditional";
+        TypeFlags[TypeFlags["Substitution"] = 8388608] = "Substitution";
+        TypeFlags[TypeFlags["NonPrimitive"] = 16777216] = "NonPrimitive";
+        /* @internal */
+        TypeFlags[TypeFlags["FreshLiteral"] = 33554432] = "FreshLiteral";
+        /* @internal */
+        TypeFlags[TypeFlags["UnionOfUnitTypes"] = 67108864] = "UnionOfUnitTypes";
+        /* @internal */
+        TypeFlags[TypeFlags["ContainsWideningType"] = 134217728] = "ContainsWideningType";
+        /* @internal */
+        TypeFlags[TypeFlags["ContainsObjectLiteral"] = 268435456] = "ContainsObjectLiteral";
+        /* @internal */
+        TypeFlags[TypeFlags["ContainsAnyFunctionType"] = 536870912] = "ContainsAnyFunctionType";
+        /* @internal */
+        TypeFlags[TypeFlags["AnyOrUnknown"] = 3] = "AnyOrUnknown";
+        /* @internal */
+        TypeFlags[TypeFlags["Nullable"] = 24576] = "Nullable";
+        TypeFlags[TypeFlags["Literal"] = 448] = "Literal";
+        TypeFlags[TypeFlags["Unit"] = 27072] = "Unit";
+        TypeFlags[TypeFlags["StringOrNumberLiteral"] = 192] = "StringOrNumberLiteral";
+        /* @internal */
+        TypeFlags[TypeFlags["StringOrNumberLiteralOrUnique"] = 2240] = "StringOrNumberLiteralOrUnique";
+        /* @internal */
+        TypeFlags[TypeFlags["DefinitelyFalsy"] = 29120] = "DefinitelyFalsy";
+        TypeFlags[TypeFlags["PossiblyFalsy"] = 29148] = "PossiblyFalsy";
+        /* @internal */
+        TypeFlags[TypeFlags["Intrinsic"] = 16839967] = "Intrinsic";
+        /* @internal */
+        TypeFlags[TypeFlags["Primitive"] = 32764] = "Primitive";
+        TypeFlags[TypeFlags["StringLike"] = 68] = "StringLike";
+        TypeFlags[TypeFlags["NumberLike"] = 168] = "NumberLike";
+        TypeFlags[TypeFlags["BooleanLike"] = 272] = "BooleanLike";
+        TypeFlags[TypeFlags["EnumLike"] = 544] = "EnumLike";
+        TypeFlags[TypeFlags["ESSymbolLike"] = 3072] = "ESSymbolLike";
+        TypeFlags[TypeFlags["VoidLike"] = 12288] = "VoidLike";
+        /* @internal */
+        TypeFlags[TypeFlags["DisjointDomains"] = 16809468] = "DisjointDomains";
+        TypeFlags[TypeFlags["UnionOrIntersection"] = 786432] = "UnionOrIntersection";
+        TypeFlags[TypeFlags["StructuredType"] = 917504] = "StructuredType";
+        TypeFlags[TypeFlags["TypeVariable"] = 2162688] = "TypeVariable";
+        TypeFlags[TypeFlags["InstantiableNonPrimitive"] = 14745600] = "InstantiableNonPrimitive";
+        TypeFlags[TypeFlags["InstantiablePrimitive"] = 1048576] = "InstantiablePrimitive";
+        TypeFlags[TypeFlags["Instantiable"] = 15794176] = "Instantiable";
+        TypeFlags[TypeFlags["StructuredOrInstantiable"] = 16711680] = "StructuredOrInstantiable";
+        // 'Narrowable' types are types where narrowing actually narrows.
+        // This *should* be every type other than null, undefined, void, and never
+        TypeFlags[TypeFlags["Narrowable"] = 33492479] = "Narrowable";
+        TypeFlags[TypeFlags["NotUnionOrUnit"] = 16909315] = "NotUnionOrUnit";
+        /* @internal */
+        TypeFlags[TypeFlags["NotUnit"] = 16749629] = "NotUnit";
+        /* @internal */
+        TypeFlags[TypeFlags["RequiresWidening"] = 402653184] = "RequiresWidening";
+        /* @internal */
+        TypeFlags[TypeFlags["PropagatingFlags"] = 939524096] = "PropagatingFlags";
+        // The following flags are used for different purposes during union and intersection type construction
+        /* @internal */
+        TypeFlags[TypeFlags["NonWideningType"] = 134217728] = "NonWideningType";
+        /* @internal */
+        TypeFlags[TypeFlags["Wildcard"] = 268435456] = "Wildcard";
+        /* @internal */
+        TypeFlags[TypeFlags["EmptyObject"] = 536870912] = "EmptyObject";
+        /* @internal */
+        TypeFlags[TypeFlags["ConstructionFlags"] = 939524096] = "ConstructionFlags";
+        // The following flag is used for different purposes by maybeTypeOfKind
+        /* @internal */
+        TypeFlags[TypeFlags["GenericMappedType"] = 134217728] = "GenericMappedType";
+    })(TypeFlags = ts.TypeFlags || (ts.TypeFlags = {}));
+    var ObjectFlags;
+    (function (ObjectFlags) {
+        ObjectFlags[ObjectFlags["Class"] = 1] = "Class";
+        ObjectFlags[ObjectFlags["Interface"] = 2] = "Interface";
+        ObjectFlags[ObjectFlags["Reference"] = 4] = "Reference";
+        ObjectFlags[ObjectFlags["Tuple"] = 8] = "Tuple";
+        ObjectFlags[ObjectFlags["Anonymous"] = 16] = "Anonymous";
+        ObjectFlags[ObjectFlags["Mapped"] = 32] = "Mapped";
+        ObjectFlags[ObjectFlags["Instantiated"] = 64] = "Instantiated";
+        ObjectFlags[ObjectFlags["ObjectLiteral"] = 128] = "ObjectLiteral";
+        ObjectFlags[ObjectFlags["EvolvingArray"] = 256] = "EvolvingArray";
+        ObjectFlags[ObjectFlags["ObjectLiteralPatternWithComputedProperties"] = 512] = "ObjectLiteralPatternWithComputedProperties";
+        ObjectFlags[ObjectFlags["ContainsSpread"] = 1024] = "ContainsSpread";
+        ObjectFlags[ObjectFlags["ReverseMapped"] = 2048] = "ReverseMapped";
+        ObjectFlags[ObjectFlags["JsxAttributes"] = 4096] = "JsxAttributes";
+        ObjectFlags[ObjectFlags["MarkerType"] = 8192] = "MarkerType";
+        ObjectFlags[ObjectFlags["ClassOrInterface"] = 3] = "ClassOrInterface";
+    })(ObjectFlags = ts.ObjectFlags || (ts.ObjectFlags = {}));
+    /* @internal */
+    var Variance;
+    (function (Variance) {
+        Variance[Variance["Invariant"] = 0] = "Invariant";
+        Variance[Variance["Covariant"] = 1] = "Covariant";
+        Variance[Variance["Contravariant"] = 2] = "Contravariant";
+        Variance[Variance["Bivariant"] = 3] = "Bivariant";
+        Variance[Variance["Independent"] = 4] = "Independent";
+    })(Variance = ts.Variance || (ts.Variance = {}));
+    var SignatureKind;
+    (function (SignatureKind) {
+        SignatureKind[SignatureKind["Call"] = 0] = "Call";
+        SignatureKind[SignatureKind["Construct"] = 1] = "Construct";
+    })(SignatureKind = ts.SignatureKind || (ts.SignatureKind = {}));
+    var IndexKind;
+    (function (IndexKind) {
+        IndexKind[IndexKind["String"] = 0] = "String";
+        IndexKind[IndexKind["Number"] = 1] = "Number";
+    })(IndexKind = ts.IndexKind || (ts.IndexKind = {}));
+    var InferencePriority;
+    (function (InferencePriority) {
+        InferencePriority[InferencePriority["NakedTypeVariable"] = 1] = "NakedTypeVariable";
+        InferencePriority[InferencePriority["HomomorphicMappedType"] = 2] = "HomomorphicMappedType";
+        InferencePriority[InferencePriority["MappedTypeConstraint"] = 4] = "MappedTypeConstraint";
+        InferencePriority[InferencePriority["ReturnType"] = 8] = "ReturnType";
+        InferencePriority[InferencePriority["LiteralKeyof"] = 16] = "LiteralKeyof";
+        InferencePriority[InferencePriority["NoConstraints"] = 32] = "NoConstraints";
+        InferencePriority[InferencePriority["AlwaysStrict"] = 64] = "AlwaysStrict";
+        InferencePriority[InferencePriority["PriorityImpliesCombination"] = 28] = "PriorityImpliesCombination";
+    })(InferencePriority = ts.InferencePriority || (ts.InferencePriority = {}));
+    /* @internal */
+    var InferenceFlags;
+    (function (InferenceFlags) {
+        InferenceFlags[InferenceFlags["None"] = 0] = "None";
+        InferenceFlags[InferenceFlags["InferUnionTypes"] = 1] = "InferUnionTypes";
+        InferenceFlags[InferenceFlags["NoDefault"] = 2] = "NoDefault";
+        InferenceFlags[InferenceFlags["AnyDefault"] = 4] = "AnyDefault";
+    })(InferenceFlags = ts.InferenceFlags || (ts.InferenceFlags = {}));
+    /**
+     * Ternary values are defined such that
+     * x & y is False if either x or y is False.
+     * x & y is Maybe if either x or y is Maybe, but neither x or y is False.
+     * x & y is True if both x and y are True.
+     * x | y is False if both x and y are False.
+     * x | y is Maybe if either x or y is Maybe, but neither x or y is True.
+     * x | y is True if either x or y is True.
+     */
+    /* @internal */
+    var Ternary;
+    (function (Ternary) {
+        Ternary[Ternary["False"] = 0] = "False";
+        Ternary[Ternary["Maybe"] = 1] = "Maybe";
+        Ternary[Ternary["True"] = -1] = "True";
+    })(Ternary = ts.Ternary || (ts.Ternary = {}));
+    /* @internal */
+    var SpecialPropertyAssignmentKind;
+    (function (SpecialPropertyAssignmentKind) {
+        SpecialPropertyAssignmentKind[SpecialPropertyAssignmentKind["None"] = 0] = "None";
+        /// exports.name = expr
+        SpecialPropertyAssignmentKind[SpecialPropertyAssignmentKind["ExportsProperty"] = 1] = "ExportsProperty";
+        /// module.exports = expr
+        SpecialPropertyAssignmentKind[SpecialPropertyAssignmentKind["ModuleExports"] = 2] = "ModuleExports";
+        /// className.prototype.name = expr
+        SpecialPropertyAssignmentKind[SpecialPropertyAssignmentKind["PrototypeProperty"] = 3] = "PrototypeProperty";
+        /// this.name = expr
+        SpecialPropertyAssignmentKind[SpecialPropertyAssignmentKind["ThisProperty"] = 4] = "ThisProperty";
+        // F.name = expr
+        SpecialPropertyAssignmentKind[SpecialPropertyAssignmentKind["Property"] = 5] = "Property";
+        // F.prototype = { ... }
+        SpecialPropertyAssignmentKind[SpecialPropertyAssignmentKind["Prototype"] = 6] = "Prototype";
+    })(SpecialPropertyAssignmentKind = ts.SpecialPropertyAssignmentKind || (ts.SpecialPropertyAssignmentKind = {}));
+    var DiagnosticCategory;
+    (function (DiagnosticCategory) {
+        DiagnosticCategory[DiagnosticCategory["Warning"] = 0] = "Warning";
+        DiagnosticCategory[DiagnosticCategory["Error"] = 1] = "Error";
+        DiagnosticCategory[DiagnosticCategory["Suggestion"] = 2] = "Suggestion";
+        DiagnosticCategory[DiagnosticCategory["Message"] = 3] = "Message";
+    })(DiagnosticCategory = ts.DiagnosticCategory || (ts.DiagnosticCategory = {}));
+    /* @internal */
+    function diagnosticCategoryName(d, lowerCase) {
+        if (lowerCase === void 0) { lowerCase = true; }
+        var name = DiagnosticCategory[d.category];
+        return lowerCase ? name.toLowerCase() : name;
+    }
+    ts.diagnosticCategoryName = diagnosticCategoryName;
+    var ModuleResolutionKind;
+    (function (ModuleResolutionKind) {
+        ModuleResolutionKind[ModuleResolutionKind["Classic"] = 1] = "Classic";
+        ModuleResolutionKind[ModuleResolutionKind["NodeJs"] = 2] = "NodeJs";
+    })(ModuleResolutionKind = ts.ModuleResolutionKind || (ts.ModuleResolutionKind = {}));
+    var ModuleKind;
+    (function (ModuleKind) {
+        ModuleKind[ModuleKind["None"] = 0] = "None";
+        ModuleKind[ModuleKind["CommonJS"] = 1] = "CommonJS";
+        ModuleKind[ModuleKind["AMD"] = 2] = "AMD";
+        ModuleKind[ModuleKind["UMD"] = 3] = "UMD";
+        ModuleKind[ModuleKind["System"] = 4] = "System";
+        ModuleKind[ModuleKind["ES2015"] = 5] = "ES2015";
+        ModuleKind[ModuleKind["ESNext"] = 6] = "ESNext";
+    })(ModuleKind = ts.ModuleKind || (ts.ModuleKind = {}));
+    var JsxEmit;
+    (function (JsxEmit) {
+        JsxEmit[JsxEmit["None"] = 0] = "None";
+        JsxEmit[JsxEmit["Preserve"] = 1] = "Preserve";
+        JsxEmit[JsxEmit["React"] = 2] = "React";
+        JsxEmit[JsxEmit["ReactNative"] = 3] = "ReactNative";
+    })(JsxEmit = ts.JsxEmit || (ts.JsxEmit = {}));
+    var NewLineKind;
+    (function (NewLineKind) {
+        NewLineKind[NewLineKind["CarriageReturnLineFeed"] = 0] = "CarriageReturnLineFeed";
+        NewLineKind[NewLineKind["LineFeed"] = 1] = "LineFeed";
+    })(NewLineKind = ts.NewLineKind || (ts.NewLineKind = {}));
+    var ScriptKind;
+    (function (ScriptKind) {
+        ScriptKind[ScriptKind["Unknown"] = 0] = "Unknown";
+        ScriptKind[ScriptKind["JS"] = 1] = "JS";
+        ScriptKind[ScriptKind["JSX"] = 2] = "JSX";
+        ScriptKind[ScriptKind["TS"] = 3] = "TS";
+        ScriptKind[ScriptKind["TSX"] = 4] = "TSX";
+        ScriptKind[ScriptKind["External"] = 5] = "External";
+        ScriptKind[ScriptKind["JSON"] = 6] = "JSON";
+        /**
+         * Used on extensions that doesn't define the ScriptKind but the content defines it.
+         * Deferred extensions are going to be included in all project contexts.
+         */
+        ScriptKind[ScriptKind["Deferred"] = 7] = "Deferred";
+    })(ScriptKind = ts.ScriptKind || (ts.ScriptKind = {}));
+    var ScriptTarget;
+    (function (ScriptTarget) {
+        ScriptTarget[ScriptTarget["ES3"] = 0] = "ES3";
+        ScriptTarget[ScriptTarget["ES5"] = 1] = "ES5";
+        ScriptTarget[ScriptTarget["ES2015"] = 2] = "ES2015";
+        ScriptTarget[ScriptTarget["ES2016"] = 3] = "ES2016";
+        ScriptTarget[ScriptTarget["ES2017"] = 4] = "ES2017";
+        ScriptTarget[ScriptTarget["ES2018"] = 5] = "ES2018";
+        ScriptTarget[ScriptTarget["ESNext"] = 6] = "ESNext";
+        ScriptTarget[ScriptTarget["JSON"] = 100] = "JSON";
+        ScriptTarget[ScriptTarget["Latest"] = 6] = "Latest";
+    })(ScriptTarget = ts.ScriptTarget || (ts.ScriptTarget = {}));
+    var LanguageVariant;
+    (function (LanguageVariant) {
+        LanguageVariant[LanguageVariant["Standard"] = 0] = "Standard";
+        LanguageVariant[LanguageVariant["JSX"] = 1] = "JSX";
+    })(LanguageVariant = ts.LanguageVariant || (ts.LanguageVariant = {}));
+    var WatchDirectoryFlags;
+    (function (WatchDirectoryFlags) {
+        WatchDirectoryFlags[WatchDirectoryFlags["None"] = 0] = "None";
+        WatchDirectoryFlags[WatchDirectoryFlags["Recursive"] = 1] = "Recursive";
+    })(WatchDirectoryFlags = ts.WatchDirectoryFlags || (ts.WatchDirectoryFlags = {}));
+    /* @internal */
+    var CharacterCodes;
+    (function (CharacterCodes) {
+        CharacterCodes[CharacterCodes["nullCharacter"] = 0] = "nullCharacter";
+        CharacterCodes[CharacterCodes["maxAsciiCharacter"] = 127] = "maxAsciiCharacter";
+        CharacterCodes[CharacterCodes["lineFeed"] = 10] = "lineFeed";
+        CharacterCodes[CharacterCodes["carriageReturn"] = 13] = "carriageReturn";
+        CharacterCodes[CharacterCodes["lineSeparator"] = 8232] = "lineSeparator";
+        CharacterCodes[CharacterCodes["paragraphSeparator"] = 8233] = "paragraphSeparator";
+        CharacterCodes[CharacterCodes["nextLine"] = 133] = "nextLine";
+        // Unicode 3.0 space characters
+        CharacterCodes[CharacterCodes["space"] = 32] = "space";
+        CharacterCodes[CharacterCodes["nonBreakingSpace"] = 160] = "nonBreakingSpace";
+        CharacterCodes[CharacterCodes["enQuad"] = 8192] = "enQuad";
+        CharacterCodes[CharacterCodes["emQuad"] = 8193] = "emQuad";
+        CharacterCodes[CharacterCodes["enSpace"] = 8194] = "enSpace";
+        CharacterCodes[CharacterCodes["emSpace"] = 8195] = "emSpace";
+        CharacterCodes[CharacterCodes["threePerEmSpace"] = 8196] = "threePerEmSpace";
+        CharacterCodes[CharacterCodes["fourPerEmSpace"] = 8197] = "fourPerEmSpace";
+        CharacterCodes[CharacterCodes["sixPerEmSpace"] = 8198] = "sixPerEmSpace";
+        CharacterCodes[CharacterCodes["figureSpace"] = 8199] = "figureSpace";
+        CharacterCodes[CharacterCodes["punctuationSpace"] = 8200] = "punctuationSpace";
+        CharacterCodes[CharacterCodes["thinSpace"] = 8201] = "thinSpace";
+        CharacterCodes[CharacterCodes["hairSpace"] = 8202] = "hairSpace";
+        CharacterCodes[CharacterCodes["zeroWidthSpace"] = 8203] = "zeroWidthSpace";
+        CharacterCodes[CharacterCodes["narrowNoBreakSpace"] = 8239] = "narrowNoBreakSpace";
+        CharacterCodes[CharacterCodes["ideographicSpace"] = 12288] = "ideographicSpace";
+        CharacterCodes[CharacterCodes["mathematicalSpace"] = 8287] = "mathematicalSpace";
+        CharacterCodes[CharacterCodes["ogham"] = 5760] = "ogham";
+        CharacterCodes[CharacterCodes["_"] = 95] = "_";
+        CharacterCodes[CharacterCodes["$"] = 36] = "$";
+        CharacterCodes[CharacterCodes["_0"] = 48] = "_0";
+        CharacterCodes[CharacterCodes["_1"] = 49] = "_1";
+        CharacterCodes[CharacterCodes["_2"] = 50] = "_2";
+        CharacterCodes[CharacterCodes["_3"] = 51] = "_3";
+        CharacterCodes[CharacterCodes["_4"] = 52] = "_4";
+        CharacterCodes[CharacterCodes["_5"] = 53] = "_5";
+        CharacterCodes[CharacterCodes["_6"] = 54] = "_6";
+        CharacterCodes[CharacterCodes["_7"] = 55] = "_7";
+        CharacterCodes[CharacterCodes["_8"] = 56] = "_8";
+        CharacterCodes[CharacterCodes["_9"] = 57] = "_9";
+        CharacterCodes[CharacterCodes["a"] = 97] = "a";
+        CharacterCodes[CharacterCodes["b"] = 98] = "b";
+        CharacterCodes[CharacterCodes["c"] = 99] = "c";
+        CharacterCodes[CharacterCodes["d"] = 100] = "d";
+        CharacterCodes[CharacterCodes["e"] = 101] = "e";
+        CharacterCodes[CharacterCodes["f"] = 102] = "f";
+        CharacterCodes[CharacterCodes["g"] = 103] = "g";
+        CharacterCodes[CharacterCodes["h"] = 104] = "h";
+        CharacterCodes[CharacterCodes["i"] = 105] = "i";
+        CharacterCodes[CharacterCodes["j"] = 106] = "j";
+        CharacterCodes[CharacterCodes["k"] = 107] = "k";
+        CharacterCodes[CharacterCodes["l"] = 108] = "l";
+        CharacterCodes[CharacterCodes["m"] = 109] = "m";
+        CharacterCodes[CharacterCodes["n"] = 110] = "n";
+        CharacterCodes[CharacterCodes["o"] = 111] = "o";
+        CharacterCodes[CharacterCodes["p"] = 112] = "p";
+        CharacterCodes[CharacterCodes["q"] = 113] = "q";
+        CharacterCodes[CharacterCodes["r"] = 114] = "r";
+        CharacterCodes[CharacterCodes["s"] = 115] = "s";
+        CharacterCodes[CharacterCodes["t"] = 116] = "t";
+        CharacterCodes[CharacterCodes["u"] = 117] = "u";
+        CharacterCodes[CharacterCodes["v"] = 118] = "v";
+        CharacterCodes[CharacterCodes["w"] = 119] = "w";
+        CharacterCodes[CharacterCodes["x"] = 120] = "x";
+        CharacterCodes[CharacterCodes["y"] = 121] = "y";
+        CharacterCodes[CharacterCodes["z"] = 122] = "z";
+        CharacterCodes[CharacterCodes["A"] = 65] = "A";
+        CharacterCodes[CharacterCodes["B"] = 66] = "B";
+        CharacterCodes[CharacterCodes["C"] = 67] = "C";
+        CharacterCodes[CharacterCodes["D"] = 68] = "D";
+        CharacterCodes[CharacterCodes["E"] = 69] = "E";
+        CharacterCodes[CharacterCodes["F"] = 70] = "F";
+        CharacterCodes[CharacterCodes["G"] = 71] = "G";
+        CharacterCodes[CharacterCodes["H"] = 72] = "H";
+        CharacterCodes[CharacterCodes["I"] = 73] = "I";
+        CharacterCodes[CharacterCodes["J"] = 74] = "J";
+        CharacterCodes[CharacterCodes["K"] = 75] = "K";
+        CharacterCodes[CharacterCodes["L"] = 76] = "L";
+        CharacterCodes[CharacterCodes["M"] = 77] = "M";
+        CharacterCodes[CharacterCodes["N"] = 78] = "N";
+        CharacterCodes[CharacterCodes["O"] = 79] = "O";
+        CharacterCodes[CharacterCodes["P"] = 80] = "P";
+        CharacterCodes[CharacterCodes["Q"] = 81] = "Q";
+        CharacterCodes[CharacterCodes["R"] = 82] = "R";
+        CharacterCodes[CharacterCodes["S"] = 83] = "S";
+        CharacterCodes[CharacterCodes["T"] = 84] = "T";
+        CharacterCodes[CharacterCodes["U"] = 85] = "U";
+        CharacterCodes[CharacterCodes["V"] = 86] = "V";
+        CharacterCodes[CharacterCodes["W"] = 87] = "W";
+        CharacterCodes[CharacterCodes["X"] = 88] = "X";
+        CharacterCodes[CharacterCodes["Y"] = 89] = "Y";
+        CharacterCodes[CharacterCodes["Z"] = 90] = "Z";
+        CharacterCodes[CharacterCodes["ampersand"] = 38] = "ampersand";
+        CharacterCodes[CharacterCodes["asterisk"] = 42] = "asterisk";
+        CharacterCodes[CharacterCodes["at"] = 64] = "at";
+        CharacterCodes[CharacterCodes["backslash"] = 92] = "backslash";
+        CharacterCodes[CharacterCodes["backtick"] = 96] = "backtick";
+        CharacterCodes[CharacterCodes["bar"] = 124] = "bar";
+        CharacterCodes[CharacterCodes["caret"] = 94] = "caret";
+        CharacterCodes[CharacterCodes["closeBrace"] = 125] = "closeBrace";
+        CharacterCodes[CharacterCodes["closeBracket"] = 93] = "closeBracket";
+        CharacterCodes[CharacterCodes["closeParen"] = 41] = "closeParen";
+        CharacterCodes[CharacterCodes["colon"] = 58] = "colon";
+        CharacterCodes[CharacterCodes["comma"] = 44] = "comma";
+        CharacterCodes[CharacterCodes["dot"] = 46] = "dot";
+        CharacterCodes[CharacterCodes["doubleQuote"] = 34] = "doubleQuote";
+        CharacterCodes[CharacterCodes["equals"] = 61] = "equals";
+        CharacterCodes[CharacterCodes["exclamation"] = 33] = "exclamation";
+        CharacterCodes[CharacterCodes["greaterThan"] = 62] = "greaterThan";
+        CharacterCodes[CharacterCodes["hash"] = 35] = "hash";
+        CharacterCodes[CharacterCodes["lessThan"] = 60] = "lessThan";
+        CharacterCodes[CharacterCodes["minus"] = 45] = "minus";
+        CharacterCodes[CharacterCodes["openBrace"] = 123] = "openBrace";
+        CharacterCodes[CharacterCodes["openBracket"] = 91] = "openBracket";
+        CharacterCodes[CharacterCodes["openParen"] = 40] = "openParen";
+        CharacterCodes[CharacterCodes["percent"] = 37] = "percent";
+        CharacterCodes[CharacterCodes["plus"] = 43] = "plus";
+        CharacterCodes[CharacterCodes["question"] = 63] = "question";
+        CharacterCodes[CharacterCodes["semicolon"] = 59] = "semicolon";
+        CharacterCodes[CharacterCodes["singleQuote"] = 39] = "singleQuote";
+        CharacterCodes[CharacterCodes["slash"] = 47] = "slash";
+        CharacterCodes[CharacterCodes["tilde"] = 126] = "tilde";
+        CharacterCodes[CharacterCodes["backspace"] = 8] = "backspace";
+        CharacterCodes[CharacterCodes["formFeed"] = 12] = "formFeed";
+        CharacterCodes[CharacterCodes["byteOrderMark"] = 65279] = "byteOrderMark";
+        CharacterCodes[CharacterCodes["tab"] = 9] = "tab";
+        CharacterCodes[CharacterCodes["verticalTab"] = 11] = "verticalTab";
+    })(CharacterCodes = ts.CharacterCodes || (ts.CharacterCodes = {}));
+    var Extension;
+    (function (Extension) {
+        Extension["Ts"] = ".ts";
+        Extension["Tsx"] = ".tsx";
+        Extension["Dts"] = ".d.ts";
+        Extension["Js"] = ".js";
+        Extension["Jsx"] = ".jsx";
+        Extension["Json"] = ".json";
+    })(Extension = ts.Extension || (ts.Extension = {}));
+    /* @internal */
+    var TransformFlags;
+    (function (TransformFlags) {
+        TransformFlags[TransformFlags["None"] = 0] = "None";
+        // Facts
+        // - Flags used to indicate that a node or subtree contains syntax that requires transformation.
+        TransformFlags[TransformFlags["TypeScript"] = 1] = "TypeScript";
+        TransformFlags[TransformFlags["ContainsTypeScript"] = 2] = "ContainsTypeScript";
+        TransformFlags[TransformFlags["ContainsJsx"] = 4] = "ContainsJsx";
+        TransformFlags[TransformFlags["ContainsESNext"] = 8] = "ContainsESNext";
+        TransformFlags[TransformFlags["ContainsES2017"] = 16] = "ContainsES2017";
+        TransformFlags[TransformFlags["ContainsES2016"] = 32] = "ContainsES2016";
+        TransformFlags[TransformFlags["ES2015"] = 64] = "ES2015";
+        TransformFlags[TransformFlags["ContainsES2015"] = 128] = "ContainsES2015";
+        TransformFlags[TransformFlags["Generator"] = 256] = "Generator";
+        TransformFlags[TransformFlags["ContainsGenerator"] = 512] = "ContainsGenerator";
+        TransformFlags[TransformFlags["DestructuringAssignment"] = 1024] = "DestructuringAssignment";
+        TransformFlags[TransformFlags["ContainsDestructuringAssignment"] = 2048] = "ContainsDestructuringAssignment";
+        // Markers
+        // - Flags used to indicate that a subtree contains a specific transformation.
+        TransformFlags[TransformFlags["ContainsDecorators"] = 4096] = "ContainsDecorators";
+        TransformFlags[TransformFlags["ContainsPropertyInitializer"] = 8192] = "ContainsPropertyInitializer";
+        TransformFlags[TransformFlags["ContainsLexicalThis"] = 16384] = "ContainsLexicalThis";
+        TransformFlags[TransformFlags["ContainsCapturedLexicalThis"] = 32768] = "ContainsCapturedLexicalThis";
+        TransformFlags[TransformFlags["ContainsLexicalThisInComputedPropertyName"] = 65536] = "ContainsLexicalThisInComputedPropertyName";
+        TransformFlags[TransformFlags["ContainsDefaultValueAssignments"] = 131072] = "ContainsDefaultValueAssignments";
+        TransformFlags[TransformFlags["ContainsParameterPropertyAssignments"] = 262144] = "ContainsParameterPropertyAssignments";
+        TransformFlags[TransformFlags["ContainsSpread"] = 524288] = "ContainsSpread";
+        TransformFlags[TransformFlags["ContainsObjectSpread"] = 1048576] = "ContainsObjectSpread";
+        TransformFlags[TransformFlags["ContainsRest"] = 524288] = "ContainsRest";
+        TransformFlags[TransformFlags["ContainsObjectRest"] = 1048576] = "ContainsObjectRest";
+        TransformFlags[TransformFlags["ContainsComputedPropertyName"] = 2097152] = "ContainsComputedPropertyName";
+        TransformFlags[TransformFlags["ContainsBlockScopedBinding"] = 4194304] = "ContainsBlockScopedBinding";
+        TransformFlags[TransformFlags["ContainsBindingPattern"] = 8388608] = "ContainsBindingPattern";
+        TransformFlags[TransformFlags["ContainsYield"] = 16777216] = "ContainsYield";
+        TransformFlags[TransformFlags["ContainsHoistedDeclarationOrCompletion"] = 33554432] = "ContainsHoistedDeclarationOrCompletion";
+        TransformFlags[TransformFlags["ContainsDynamicImport"] = 67108864] = "ContainsDynamicImport";
+        TransformFlags[TransformFlags["Super"] = 134217728] = "Super";
+        TransformFlags[TransformFlags["ContainsSuper"] = 268435456] = "ContainsSuper";
+        // Please leave this as 1 << 29.
+        // It is the maximum bit we can set before we outgrow the size of a v8 small integer (SMI) on an x86 system.
+        // It is a good reminder of how much room we have left
+        TransformFlags[TransformFlags["HasComputedFlags"] = 536870912] = "HasComputedFlags";
+        // Assertions
+        // - Bitmasks that are used to assert facts about the syntax of a node and its subtree.
+        TransformFlags[TransformFlags["AssertTypeScript"] = 3] = "AssertTypeScript";
+        TransformFlags[TransformFlags["AssertJsx"] = 4] = "AssertJsx";
+        TransformFlags[TransformFlags["AssertESNext"] = 8] = "AssertESNext";
+        TransformFlags[TransformFlags["AssertES2017"] = 16] = "AssertES2017";
+        TransformFlags[TransformFlags["AssertES2016"] = 32] = "AssertES2016";
+        TransformFlags[TransformFlags["AssertES2015"] = 192] = "AssertES2015";
+        TransformFlags[TransformFlags["AssertGenerator"] = 768] = "AssertGenerator";
+        TransformFlags[TransformFlags["AssertDestructuringAssignment"] = 3072] = "AssertDestructuringAssignment";
+        // Scope Exclusions
+        // - Bitmasks that exclude flags from propagating out of a specific context
+        //   into the subtree flags of their container.
+        TransformFlags[TransformFlags["OuterExpressionExcludes"] = 536872257] = "OuterExpressionExcludes";
+        TransformFlags[TransformFlags["PropertyAccessExcludes"] = 671089985] = "PropertyAccessExcludes";
+        TransformFlags[TransformFlags["NodeExcludes"] = 939525441] = "NodeExcludes";
+        TransformFlags[TransformFlags["ArrowFunctionExcludes"] = 1003902273] = "ArrowFunctionExcludes";
+        TransformFlags[TransformFlags["FunctionExcludes"] = 1003935041] = "FunctionExcludes";
+        TransformFlags[TransformFlags["ConstructorExcludes"] = 1003668801] = "ConstructorExcludes";
+        TransformFlags[TransformFlags["MethodOrAccessorExcludes"] = 1003668801] = "MethodOrAccessorExcludes";
+        TransformFlags[TransformFlags["ClassExcludes"] = 942011713] = "ClassExcludes";
+        TransformFlags[TransformFlags["ModuleExcludes"] = 977327425] = "ModuleExcludes";
+        TransformFlags[TransformFlags["TypeExcludes"] = -3] = "TypeExcludes";
+        TransformFlags[TransformFlags["ObjectLiteralExcludes"] = 942740801] = "ObjectLiteralExcludes";
+        TransformFlags[TransformFlags["ArrayLiteralOrCallOrNewExcludes"] = 940049729] = "ArrayLiteralOrCallOrNewExcludes";
+        TransformFlags[TransformFlags["VariableDeclarationListExcludes"] = 948962625] = "VariableDeclarationListExcludes";
+        TransformFlags[TransformFlags["ParameterExcludes"] = 939525441] = "ParameterExcludes";
+        TransformFlags[TransformFlags["CatchClauseExcludes"] = 940574017] = "CatchClauseExcludes";
+        TransformFlags[TransformFlags["BindingPatternExcludes"] = 940049729] = "BindingPatternExcludes";
+        // Masks
+        // - Additional bitmasks
+        TransformFlags[TransformFlags["TypeScriptClassSyntaxMask"] = 274432] = "TypeScriptClassSyntaxMask";
+        TransformFlags[TransformFlags["ES2015FunctionSyntaxMask"] = 163840] = "ES2015FunctionSyntaxMask";
+    })(TransformFlags = ts.TransformFlags || (ts.TransformFlags = {}));
+    var EmitFlags;
+    (function (EmitFlags) {
+        EmitFlags[EmitFlags["None"] = 0] = "None";
+        EmitFlags[EmitFlags["SingleLine"] = 1] = "SingleLine";
+        EmitFlags[EmitFlags["AdviseOnEmitNode"] = 2] = "AdviseOnEmitNode";
+        EmitFlags[EmitFlags["NoSubstitution"] = 4] = "NoSubstitution";
+        EmitFlags[EmitFlags["CapturesThis"] = 8] = "CapturesThis";
+        EmitFlags[EmitFlags["NoLeadingSourceMap"] = 16] = "NoLeadingSourceMap";
+        EmitFlags[EmitFlags["NoTrailingSourceMap"] = 32] = "NoTrailingSourceMap";
+        EmitFlags[EmitFlags["NoSourceMap"] = 48] = "NoSourceMap";
+        EmitFlags[EmitFlags["NoNestedSourceMaps"] = 64] = "NoNestedSourceMaps";
+        EmitFlags[EmitFlags["NoTokenLeadingSourceMaps"] = 128] = "NoTokenLeadingSourceMaps";
+        EmitFlags[EmitFlags["NoTokenTrailingSourceMaps"] = 256] = "NoTokenTrailingSourceMaps";
+        EmitFlags[EmitFlags["NoTokenSourceMaps"] = 384] = "NoTokenSourceMaps";
+        EmitFlags[EmitFlags["NoLeadingComments"] = 512] = "NoLeadingComments";
+        EmitFlags[EmitFlags["NoTrailingComments"] = 1024] = "NoTrailingComments";
+        EmitFlags[EmitFlags["NoComments"] = 1536] = "NoComments";
+        EmitFlags[EmitFlags["NoNestedComments"] = 2048] = "NoNestedComments";
+        EmitFlags[EmitFlags["HelperName"] = 4096] = "HelperName";
+        EmitFlags[EmitFlags["ExportName"] = 8192] = "ExportName";
+        EmitFlags[EmitFlags["LocalName"] = 16384] = "LocalName";
+        EmitFlags[EmitFlags["InternalName"] = 32768] = "InternalName";
+        EmitFlags[EmitFlags["Indented"] = 65536] = "Indented";
+        EmitFlags[EmitFlags["NoIndentation"] = 131072] = "NoIndentation";
+        EmitFlags[EmitFlags["AsyncFunctionBody"] = 262144] = "AsyncFunctionBody";
+        EmitFlags[EmitFlags["ReuseTempVariableScope"] = 524288] = "ReuseTempVariableScope";
+        EmitFlags[EmitFlags["CustomPrologue"] = 1048576] = "CustomPrologue";
+        EmitFlags[EmitFlags["NoHoisting"] = 2097152] = "NoHoisting";
+        EmitFlags[EmitFlags["HasEndOfDeclarationMarker"] = 4194304] = "HasEndOfDeclarationMarker";
+        EmitFlags[EmitFlags["Iterator"] = 8388608] = "Iterator";
+        EmitFlags[EmitFlags["NoAsciiEscaping"] = 16777216] = "NoAsciiEscaping";
+        /*@internal*/ EmitFlags[EmitFlags["TypeScriptClassWrapper"] = 33554432] = "TypeScriptClassWrapper";
+        /*@internal*/ EmitFlags[EmitFlags["NeverApplyImportHelper"] = 67108864] = "NeverApplyImportHelper";
+    })(EmitFlags = ts.EmitFlags || (ts.EmitFlags = {}));
+    /**
+     * Used by the checker, this enum keeps track of external emit helpers that should be type
+     * checked.
+     */
+    /* @internal */
+    var ExternalEmitHelpers;
+    (function (ExternalEmitHelpers) {
+        ExternalEmitHelpers[ExternalEmitHelpers["Extends"] = 1] = "Extends";
+        ExternalEmitHelpers[ExternalEmitHelpers["Assign"] = 2] = "Assign";
+        ExternalEmitHelpers[ExternalEmitHelpers["Rest"] = 4] = "Rest";
+        ExternalEmitHelpers[ExternalEmitHelpers["Decorate"] = 8] = "Decorate";
+        ExternalEmitHelpers[ExternalEmitHelpers["Metadata"] = 16] = "Metadata";
+        ExternalEmitHelpers[ExternalEmitHelpers["Param"] = 32] = "Param";
+        ExternalEmitHelpers[ExternalEmitHelpers["Awaiter"] = 64] = "Awaiter";
+        ExternalEmitHelpers[ExternalEmitHelpers["Generator"] = 128] = "Generator";
+        ExternalEmitHelpers[ExternalEmitHelpers["Values"] = 256] = "Values";
+        ExternalEmitHelpers[ExternalEmitHelpers["Read"] = 512] = "Read";
+        ExternalEmitHelpers[ExternalEmitHelpers["Spread"] = 1024] = "Spread";
+        ExternalEmitHelpers[ExternalEmitHelpers["Await"] = 2048] = "Await";
+        ExternalEmitHelpers[ExternalEmitHelpers["AsyncGenerator"] = 4096] = "AsyncGenerator";
+        ExternalEmitHelpers[ExternalEmitHelpers["AsyncDelegator"] = 8192] = "AsyncDelegator";
+        ExternalEmitHelpers[ExternalEmitHelpers["AsyncValues"] = 16384] = "AsyncValues";
+        ExternalEmitHelpers[ExternalEmitHelpers["ExportStar"] = 32768] = "ExportStar";
+        ExternalEmitHelpers[ExternalEmitHelpers["MakeTemplateObject"] = 65536] = "MakeTemplateObject";
+        ExternalEmitHelpers[ExternalEmitHelpers["FirstEmitHelper"] = 1] = "FirstEmitHelper";
+        ExternalEmitHelpers[ExternalEmitHelpers["LastEmitHelper"] = 65536] = "LastEmitHelper";
+        // Helpers included by ES2015 for..of
+        ExternalEmitHelpers[ExternalEmitHelpers["ForOfIncludes"] = 256] = "ForOfIncludes";
+        // Helpers included by ES2017 for..await..of
+        ExternalEmitHelpers[ExternalEmitHelpers["ForAwaitOfIncludes"] = 16384] = "ForAwaitOfIncludes";
+        // Helpers included by ES2017 async generators
+        ExternalEmitHelpers[ExternalEmitHelpers["AsyncGeneratorIncludes"] = 6144] = "AsyncGeneratorIncludes";
+        // Helpers included by yield* in ES2017 async generators
+        ExternalEmitHelpers[ExternalEmitHelpers["AsyncDelegatorIncludes"] = 26624] = "AsyncDelegatorIncludes";
+        // Helpers included by ES2015 spread
+        ExternalEmitHelpers[ExternalEmitHelpers["SpreadIncludes"] = 1536] = "SpreadIncludes";
+    })(ExternalEmitHelpers = ts.ExternalEmitHelpers || (ts.ExternalEmitHelpers = {}));
+    var EmitHint;
+    (function (EmitHint) {
+        EmitHint[EmitHint["SourceFile"] = 0] = "SourceFile";
+        EmitHint[EmitHint["Expression"] = 1] = "Expression";
+        EmitHint[EmitHint["IdentifierName"] = 2] = "IdentifierName";
+        EmitHint[EmitHint["MappedTypeParameter"] = 3] = "MappedTypeParameter";
+        EmitHint[EmitHint["Unspecified"] = 4] = "Unspecified";
+    })(EmitHint = ts.EmitHint || (ts.EmitHint = {}));
+    var ListFormat;
+    (function (ListFormat) {
+        ListFormat[ListFormat["None"] = 0] = "None";
+        // Line separators
+        ListFormat[ListFormat["SingleLine"] = 0] = "SingleLine";
+        ListFormat[ListFormat["MultiLine"] = 1] = "MultiLine";
+        ListFormat[ListFormat["PreserveLines"] = 2] = "PreserveLines";
+        ListFormat[ListFormat["LinesMask"] = 3] = "LinesMask";
+        // Delimiters
+        ListFormat[ListFormat["NotDelimited"] = 0] = "NotDelimited";
+        ListFormat[ListFormat["BarDelimited"] = 4] = "BarDelimited";
+        ListFormat[ListFormat["AmpersandDelimited"] = 8] = "AmpersandDelimited";
+        ListFormat[ListFormat["CommaDelimited"] = 16] = "CommaDelimited";
+        ListFormat[ListFormat["DelimitersMask"] = 28] = "DelimitersMask";
+        ListFormat[ListFormat["AllowTrailingComma"] = 32] = "AllowTrailingComma";
+        // Whitespace
+        ListFormat[ListFormat["Indented"] = 64] = "Indented";
+        ListFormat[ListFormat["SpaceBetweenBraces"] = 128] = "SpaceBetweenBraces";
+        ListFormat[ListFormat["SpaceBetweenSiblings"] = 256] = "SpaceBetweenSiblings";
+        // Brackets/Braces
+        ListFormat[ListFormat["Braces"] = 512] = "Braces";
+        ListFormat[ListFormat["Parenthesis"] = 1024] = "Parenthesis";
+        ListFormat[ListFormat["AngleBrackets"] = 2048] = "AngleBrackets";
+        ListFormat[ListFormat["SquareBrackets"] = 4096] = "SquareBrackets";
+        ListFormat[ListFormat["BracketsMask"] = 7680] = "BracketsMask";
+        ListFormat[ListFormat["OptionalIfUndefined"] = 8192] = "OptionalIfUndefined";
+        ListFormat[ListFormat["OptionalIfEmpty"] = 16384] = "OptionalIfEmpty";
+        ListFormat[ListFormat["Optional"] = 24576] = "Optional";
+        // Other
+        ListFormat[ListFormat["PreferNewLine"] = 32768] = "PreferNewLine";
+        ListFormat[ListFormat["NoTrailingNewLine"] = 65536] = "NoTrailingNewLine";
+        ListFormat[ListFormat["NoInterveningComments"] = 131072] = "NoInterveningComments";
+        ListFormat[ListFormat["NoSpaceIfEmpty"] = 262144] = "NoSpaceIfEmpty";
+        ListFormat[ListFormat["SingleElement"] = 524288] = "SingleElement";
+        // Precomputed Formats
+        ListFormat[ListFormat["Modifiers"] = 131328] = "Modifiers";
+        ListFormat[ListFormat["HeritageClauses"] = 256] = "HeritageClauses";
+        ListFormat[ListFormat["SingleLineTypeLiteralMembers"] = 384] = "SingleLineTypeLiteralMembers";
+        ListFormat[ListFormat["MultiLineTypeLiteralMembers"] = 16449] = "MultiLineTypeLiteralMembers";
+        ListFormat[ListFormat["TupleTypeElements"] = 272] = "TupleTypeElements";
+        ListFormat[ListFormat["UnionTypeConstituents"] = 260] = "UnionTypeConstituents";
+        ListFormat[ListFormat["IntersectionTypeConstituents"] = 264] = "IntersectionTypeConstituents";
+        ListFormat[ListFormat["ObjectBindingPatternElements"] = 262576] = "ObjectBindingPatternElements";
+        ListFormat[ListFormat["ArrayBindingPatternElements"] = 262448] = "ArrayBindingPatternElements";
+        ListFormat[ListFormat["ObjectLiteralExpressionProperties"] = 263122] = "ObjectLiteralExpressionProperties";
+        ListFormat[ListFormat["ArrayLiteralExpressionElements"] = 4466] = "ArrayLiteralExpressionElements";
+        ListFormat[ListFormat["CommaListElements"] = 272] = "CommaListElements";
+        ListFormat[ListFormat["CallExpressionArguments"] = 1296] = "CallExpressionArguments";
+        ListFormat[ListFormat["NewExpressionArguments"] = 9488] = "NewExpressionArguments";
+        ListFormat[ListFormat["TemplateExpressionSpans"] = 131072] = "TemplateExpressionSpans";
+        ListFormat[ListFormat["SingleLineBlockStatements"] = 384] = "SingleLineBlockStatements";
+        ListFormat[ListFormat["MultiLineBlockStatements"] = 65] = "MultiLineBlockStatements";
+        ListFormat[ListFormat["VariableDeclarationList"] = 272] = "VariableDeclarationList";
+        ListFormat[ListFormat["SingleLineFunctionBodyStatements"] = 384] = "SingleLineFunctionBodyStatements";
+        ListFormat[ListFormat["MultiLineFunctionBodyStatements"] = 1] = "MultiLineFunctionBodyStatements";
+        ListFormat[ListFormat["ClassHeritageClauses"] = 0] = "ClassHeritageClauses";
+        ListFormat[ListFormat["ClassMembers"] = 65] = "ClassMembers";
+        ListFormat[ListFormat["InterfaceMembers"] = 65] = "InterfaceMembers";
+        ListFormat[ListFormat["EnumMembers"] = 81] = "EnumMembers";
+        ListFormat[ListFormat["CaseBlockClauses"] = 65] = "CaseBlockClauses";
+        ListFormat[ListFormat["NamedImportsOrExportsElements"] = 262576] = "NamedImportsOrExportsElements";
+        ListFormat[ListFormat["JsxElementOrFragmentChildren"] = 131072] = "JsxElementOrFragmentChildren";
+        ListFormat[ListFormat["JsxElementAttributes"] = 131328] = "JsxElementAttributes";
+        ListFormat[ListFormat["CaseOrDefaultClauseStatements"] = 81985] = "CaseOrDefaultClauseStatements";
+        ListFormat[ListFormat["HeritageClauseTypes"] = 272] = "HeritageClauseTypes";
+        ListFormat[ListFormat["SourceFileStatements"] = 65537] = "SourceFileStatements";
+        ListFormat[ListFormat["Decorators"] = 24577] = "Decorators";
+        ListFormat[ListFormat["TypeArguments"] = 26896] = "TypeArguments";
+        ListFormat[ListFormat["TypeParameters"] = 26896] = "TypeParameters";
+        ListFormat[ListFormat["Parameters"] = 1296] = "Parameters";
+        ListFormat[ListFormat["IndexSignatureParameters"] = 4432] = "IndexSignatureParameters";
+    })(ListFormat = ts.ListFormat || (ts.ListFormat = {}));
+    /* @internal */
+    var PragmaKindFlags;
+    (function (PragmaKindFlags) {
+        PragmaKindFlags[PragmaKindFlags["None"] = 0] = "None";
+        /**
+         * Triple slash comment of the form
+         * /// <pragma-name argname="value" />
+         */
+        PragmaKindFlags[PragmaKindFlags["TripleSlashXML"] = 1] = "TripleSlashXML";
+        /**
+         * Single line comment of the form
+         * // @pragma-name argval1 argval2
+         * or
+         * /// @pragma-name argval1 argval2
+         */
+        PragmaKindFlags[PragmaKindFlags["SingleLine"] = 2] = "SingleLine";
+        /**
+         * Multiline non-jsdoc pragma of the form
+         * /* @pragma-name argval1 argval2 * /
+         */
+        PragmaKindFlags[PragmaKindFlags["MultiLine"] = 4] = "MultiLine";
+        PragmaKindFlags[PragmaKindFlags["All"] = 7] = "All";
+        PragmaKindFlags[PragmaKindFlags["Default"] = 7] = "Default";
+    })(PragmaKindFlags = ts.PragmaKindFlags || (ts.PragmaKindFlags = {}));
+    /**
+     * This function only exists to cause exact types to be inferred for all the literals within `commentPragmas`
+     */
+    /* @internal */
+    function _contextuallyTypePragmas(args) {
+        return args;
+    }
+    // While not strictly a type, this is here because `PragmaMap` needs to be here to be used with `SourceFile`, and we don't
+    //  fancy effectively defining it twice, once in value-space and once in type-space
+    /* @internal */
+    ts.commentPragmas = _contextuallyTypePragmas({
+        "reference": {
+            args: [
+                { name: "types", optional: true, captureSpan: true },
+                { name: "lib", optional: true, captureSpan: true },
+                { name: "path", optional: true, captureSpan: true },
+                { name: "no-default-lib", optional: true }
+            ],
+            kind: 1 /* TripleSlashXML */
+        },
+        "amd-dependency": {
+            args: [{ name: "path" }, { name: "name", optional: true }],
+            kind: 1 /* TripleSlashXML */
+        },
+        "amd-module": {
+            args: [{ name: "name" }],
+            kind: 1 /* TripleSlashXML */
+        },
+        "ts-check": {
+            kind: 2 /* SingleLine */
+        },
+        "ts-nocheck": {
+            kind: 2 /* SingleLine */
+        },
+        "jsx": {
+            args: [{ name: "factory" }],
+            kind: 4 /* MultiLine */
+        },
+    });
+})(ts || (ts = {}));
+var ts;
+(function (ts) {
+    /**
+     * Set a high stack trace limit to provide more information in case of an error.
+     * Called for command-line and server use cases.
+     * Not called if TypeScript is used as a library.
+     */
+    /* @internal */
     function setStackTraceLimit() {
-        if (Error.stackTraceLimit < 100) {
+        if (Error.stackTraceLimit < 100) { // Also tests that we won't set the property if it doesn't exist.
             Error.stackTraceLimit = 100;
         }
     }
@@ -2878,6 +3518,7 @@ var ts;
         FileWatcherEventKind[FileWatcherEventKind["Changed"] = 1] = "Changed";
         FileWatcherEventKind[FileWatcherEventKind["Deleted"] = 2] = "Deleted";
     })(FileWatcherEventKind = ts.FileWatcherEventKind || (ts.FileWatcherEventKind = {}));
+    /* @internal */
     var PollingInterval;
     (function (PollingInterval) {
         PollingInterval[PollingInterval["High"] = 2000] = "High";
@@ -2893,11 +3534,13 @@ var ts;
         return pollingIntervalsForPriority[watchPriority];
     }
     var pollingIntervalsForPriority = getPriorityValues(250);
+    /* @internal */
     function watchFileUsingPriorityPollingInterval(host, fileName, callback, watchPriority) {
         return host.watchFile(fileName, callback, pollingInterval(watchPriority));
     }
     ts.watchFileUsingPriorityPollingInterval = watchFileUsingPriorityPollingInterval;
-    ts.missingFileModifiedTime = new Date(0);
+    /* @internal */
+    ts.missingFileModifiedTime = new Date(0); // Any subsequent modification will occur after this time
     function createPollingIntervalBasedLevels(levels) {
         var _a;
         return _a = {},
@@ -2908,7 +3551,9 @@ var ts;
     }
     var defaultChunkLevels = { Low: 32, Medium: 64, High: 256 };
     var pollingChunkSize = createPollingIntervalBasedLevels(defaultChunkLevels);
+    /* @internal */
     ts.unchangedPollThresholds = createPollingIntervalBasedLevels(defaultChunkLevels);
+    /* @internal */
     function setCustomPollingValues(system) {
         if (!system.getEnvironmentVariable) {
             return;
@@ -2952,6 +3597,7 @@ var ts;
         }
     }
     ts.setCustomPollingValues = setCustomPollingValues;
+    /* @internal */
     function createDynamicPriorityPollingWatchFile(host) {
         var watchedFiles = [];
         var changedFilesInLastPoll = [];
@@ -2971,7 +3617,9 @@ var ts;
             return {
                 close: function () {
                     file.isClosed = true;
+                    // Remove from watchedFiles
                     ts.unorderedRemoveItem(watchedFiles, file);
+                    // Do not update polling interval queue since that will happen as part of polling
                 }
             };
         }
@@ -2984,6 +3632,7 @@ var ts;
         }
         function pollPollingIntervalQueue(queue) {
             queue.pollIndex = pollQueue(queue, queue.pollingInterval, queue.pollIndex, pollingChunkSize[queue.pollingInterval]);
+            // Set the next polling index and timeout
             if (queue.length) {
                 scheduleNextPoll(queue.pollingInterval);
             }
@@ -2993,13 +3642,18 @@ var ts;
             }
         }
         function pollLowPollingIntervalQueue(queue) {
-            pollQueue(changedFilesInLastPoll, PollingInterval.Low, 0, changedFilesInLastPoll.length);
+            // Always poll complete list of changedFilesInLastPoll
+            pollQueue(changedFilesInLastPoll, PollingInterval.Low, /*pollIndex*/ 0, changedFilesInLastPoll.length);
+            // Finally do the actual polling of the queue
             pollPollingIntervalQueue(queue);
+            // Schedule poll if there are files in changedFilesInLastPoll but no files in the actual queue
+            // as pollPollingIntervalQueue wont schedule for next poll
             if (!queue.pollScheduled && changedFilesInLastPoll.length) {
                 scheduleNextPoll(PollingInterval.Low);
             }
         }
         function pollQueue(queue, pollingInterval, pollIndex, chunkSize) {
+            // Max visit would be all elements of the queue
             var needsVisit = queue.length;
             var definedValueCopyToIndex = pollIndex;
             for (var polled = 0; polled < chunkSize && needsVisit > 0; nextPollIndex(), needsVisit--) {
@@ -3014,10 +3668,12 @@ var ts;
                 polled++;
                 var fileChanged = onWatchedFileStat(watchedFile, getModifiedTime(watchedFile.fileName));
                 if (watchedFile.isClosed) {
+                    // Closed watcher as part of callback
                     queue[pollIndex] = undefined;
                 }
                 else if (fileChanged) {
                     watchedFile.unchangedPolls = 0;
+                    // Changed files go to changedFilesInLastPoll queue
                     if (queue !== changedFilesInLastPoll) {
                         queue[pollIndex] = undefined;
                         addChangedFileToLowPollingIntervalQueue(watchedFile);
@@ -3027,6 +3683,7 @@ var ts;
                     watchedFile.unchangedPolls++;
                 }
                 else if (queue === changedFilesInLastPoll) {
+                    // Restart unchangedPollCount for unchanged file and move to low polling interval queue
                     watchedFile.unchangedPolls = 1;
                     queue[pollIndex] = undefined;
                     addToPollingIntervalQueue(watchedFile, PollingInterval.Low);
@@ -3037,6 +3694,7 @@ var ts;
                     addToPollingIntervalQueue(watchedFile, pollingInterval === PollingInterval.Low ? PollingInterval.Medium : PollingInterval.High);
                 }
                 if (queue[pollIndex]) {
+                    // Copy this file to the non hole location
                     if (definedValueCopyToIndex < pollIndex) {
                         queue[definedValueCopyToIndex] = watchedFile;
                         queue[pollIndex] = undefined;
@@ -3044,11 +3702,13 @@ var ts;
                     definedValueCopyToIndex++;
                 }
             }
+            // Return next poll index
             return pollIndex;
             function nextPollIndex() {
                 pollIndex++;
                 if (pollIndex === queue.length) {
                     if (definedValueCopyToIndex < pollIndex) {
+                        // There are holes from nextDefinedValueIndex to end of queue, change queue size
                         queue.length = definedValueCopyToIndex;
                     }
                     pollIndex = 0;
@@ -3087,6 +3747,10 @@ var ts;
         }
     }
     ts.createDynamicPriorityPollingWatchFile = createDynamicPriorityPollingWatchFile;
+    /**
+     * Returns true if file status changed
+     */
+    /*@internal*/
     function onWatchedFileStat(watchedFile, modifiedTime) {
         var oldTime = watchedFile.mtime.getTime();
         var newTime = modifiedTime.getTime();
@@ -3103,11 +3767,22 @@ var ts;
         return false;
     }
     ts.onWatchedFileStat = onWatchedFileStat;
+    /**
+     * Watch the directory recursively using host provided method to watch child directories
+     * that means if this is recursive watcher, watch the children directories as well
+     * (eg on OS that dont support recursive watch using fs.watch use fs.watchFile)
+     */
+    /*@internal*/
     function createRecursiveDirectoryWatcher(host) {
         return createDirectoryWatcher;
+        /**
+         * Create the directory watcher for the dirPath.
+         */
         function createDirectoryWatcher(dirName, callback) {
             var watcher = host.watchDirectory(dirName, function (fileName) {
+                // Call the actual callback
                 callback(fileName);
+                // Iterate through existing children and update the watches if needed
                 updateChildWatches(result, callback);
             });
             var result = {
@@ -3123,21 +3798,33 @@ var ts;
             return result;
         }
         function updateChildWatches(watcher, callback) {
+            // Iterate through existing children and update the watches if needed
             if (watcher) {
                 watcher.childWatches = watchChildDirectories(watcher.dirName, watcher.childWatches, callback);
             }
         }
+        /**
+         * Watch the directories in the parentDir
+         */
         function watchChildDirectories(parentDir, existingChildWatches, callback) {
             var newChildWatches;
             ts.enumerateInsertsAndDeletes(host.directoryExists(parentDir) ? ts.mapDefined(host.getAccessibleSortedChildDirectories(parentDir), function (child) {
                 var childFullName = ts.getNormalizedAbsolutePath(child, parentDir);
-                return host.filePathComparer(childFullName, host.realpath(childFullName)) === 0 ? childFullName : undefined;
+                // Filter our the symbolic link directories since those arent included in recursive watch
+                // which is same behaviour when recursive: true is passed to fs.watch
+                return host.filePathComparer(childFullName, host.realpath(childFullName)) === 0 /* EqualTo */ ? childFullName : undefined;
             }) : ts.emptyArray, existingChildWatches, function (child, childWatcher) { return host.filePathComparer(child, childWatcher.dirName); }, createAndAddChildDirectoryWatcher, ts.closeFileWatcher, addChildDirectoryWatcher);
             return newChildWatches || ts.emptyArray;
+            /**
+             * Create new childDirectoryWatcher and add it to the new ChildDirectoryWatcher list
+             */
             function createAndAddChildDirectoryWatcher(childName) {
                 var result = createDirectoryWatcher(childName, callback);
                 addChildDirectoryWatcher(result);
             }
+            /**
+             * Add child directory watcher to the new ChildDirectoryWatcher list
+             */
             function addChildDirectoryWatcher(childWatcher) {
                 (newChildWatches || (newChildWatches = [])).push(childWatcher);
             }
@@ -3159,12 +3846,17 @@ var ts;
         return parseInt(version.substring(1, dot));
     }
     ts.getNodeMajorVersion = getNodeMajorVersion;
+    // TODO: this is used as if it's certainly defined in many places.
     ts.sys = (function () {
+        // NodeJS detects "\uFEFF" at the start of the string and *replaces* it with the actual
+        // byte order mark from the specified encoding. Using any other byte order mark does
+        // not actually work.
         var byteOrderMarkIndicator = "\uFEFF";
         function getNodeSystem() {
             var _fs = require("fs");
             var _path = require("path");
             var _os = require("os");
+            // crypto can be absent on reduced node installations
             var _crypto;
             try {
                 _crypto = require("crypto");
@@ -3177,6 +3869,11 @@ var ts;
             var isNode4OrLater = nodeVersion >= 4;
             var platform = _os.platform();
             var useCaseSensitiveFileNames = isFileSystemCaseSensitive();
+            var FileSystemEntryKind;
+            (function (FileSystemEntryKind) {
+                FileSystemEntryKind[FileSystemEntryKind["File"] = 0] = "File";
+                FileSystemEntryKind[FileSystemEntryKind["Directory"] = 1] = "Directory";
+            })(FileSystemEntryKind || (FileSystemEntryKind = {}));
             var useNonPollingWatchers = process.env.TSC_NONPOLLING_WATCHER;
             var tscWatchFile = process.env.TSC_WATCHFILE;
             var tscWatchDirectory = process.env.TSC_WATCHDIRECTORY;
@@ -3215,6 +3912,8 @@ var ts;
                 },
                 readDirectory: readDirectory,
                 getModifiedTime: getModifiedTime,
+                setModifiedTime: setModifiedTime,
+                deleteFile: deleteFile,
                 createHash: _crypto ? createMD5HashUsingNativeCrypto : generateDjb2Hash,
                 createSHA256Hash: _crypto ? createSHA256Hash : undefined,
                 getMemoryUsage: function () {
@@ -3230,7 +3929,7 @@ var ts;
                             return stat.size;
                         }
                     }
-                    catch (_a) { }
+                    catch ( /*ignore*/_a) { /*ignore*/ }
                     return 0;
                 },
                 exit: function (exitCode) {
@@ -3243,6 +3942,7 @@ var ts;
                         require("source-map-support").install();
                     }
                     catch (_a) {
+                        // Could not enable source maps.
                     }
                 },
                 setTimeout: setTimeout,
@@ -3268,11 +3968,14 @@ var ts;
             };
             return nodeSystem;
             function isFileSystemCaseSensitive() {
+                // win32\win64 are case insensitive platforms
                 if (platform === "win32" || platform === "win64") {
                     return false;
                 }
+                // If this file exists under a different case, we must be case-insensitve.
                 return !fileExists(swapCase(__filename));
             }
+            /** Convert all lowercase chars to uppercase, and vice-versa */
             function swapCase(s) {
                 return s.replace(/\w/g, function (ch) {
                     var up = ch.toUpperCase();
@@ -3282,22 +3985,30 @@ var ts;
             function getWatchFile() {
                 switch (tscWatchFile) {
                     case "PriorityPollingInterval":
+                        // Use polling interval based on priority when create watch using host.watchFile
                         return fsWatchFile;
                     case "DynamicPriorityPolling":
+                        // Use polling interval but change the interval depending on file changes and their default polling interval
                         return createDynamicPriorityPollingWatchFile({ getModifiedTime: getModifiedTime, setTimeout: setTimeout });
                     case "UseFsEvents":
+                        // Use notifications from FS to watch with falling back to fs.watchFile
                         return watchFileUsingFsWatch;
                     case "UseFsEventsWithFallbackDynamicPolling":
+                        // Use notifications from FS to watch with falling back to dynamic watch file
                         dynamicPollingWatchFile = createDynamicPriorityPollingWatchFile({ getModifiedTime: getModifiedTime, setTimeout: setTimeout });
                         return createWatchFileUsingDynamicWatchFile(dynamicPollingWatchFile);
                     case "UseFsEventsOnParentDirectory":
+                        // Use notifications from FS to watch with falling back to fs.watchFile
                         return createNonPollingWatchFile();
                 }
                 return useNonPollingWatchers ?
                     createNonPollingWatchFile() :
+                    // Default to do not use polling interval as it is before this experiment branch
                     function (fileName, callback) { return fsWatchFile(fileName, callback); };
             }
             function getWatchDirectory() {
+                // Node 4.0 `fs.watch` function supports the "recursive" option on both OSX and Windows
+                // (ref: https://github.com/nodejs/node/pull/2649 and https://github.com/Microsoft/TypeScript/issues/4643)
                 var fsSupportsRecursive = isNode4OrLater && (process.platform === "win32" || process.platform === "darwin");
                 if (fsSupportsRecursive) {
                     return watchDirectoryUsingFsWatch;
@@ -3319,10 +4030,11 @@ var ts;
                         return watchDirectoryRecursively(directoryName, callback);
                     }
                     watchDirectory(directoryName, callback);
-                    return undefined;
+                    return undefined; // TODO: GH#18217
                 };
             }
             function createNonPollingWatchFile() {
+                // One file can have multiple watchers
                 var fileWatcherCallbacks = ts.createMultiMap();
                 var dirWatchers = ts.createMap();
                 var toCanonicalName = ts.createGetCanonicalFileName(useCaseSensitiveFileNames);
@@ -3348,9 +4060,11 @@ var ts;
                 }
                 function createDirectoryWatcher(dirName, dirPath) {
                     var watcher = fsWatchDirectory(dirName, function (_eventName, relativeFileName) {
+                        // When files are deleted from disk, the triggered "rename" event would have a relativefileName of "undefined"
                         var fileName = !ts.isString(relativeFileName)
-                            ? undefined
+                            ? undefined // TODO: GH#18217
                             : ts.getNormalizedAbsolutePath(relativeFileName, dirName);
+                        // Some applications save a working file via rename operations
                         var callbacks = fileWatcherCallbacks.get(toCanonicalName(fileName));
                         if (callbacks) {
                             for (var _i = 0, callbacks_1 = callbacks; _i < callbacks_1.length; _i++) {
@@ -3371,9 +4085,12 @@ var ts;
                     close: function () { return _fs.unwatchFile(fileName, fileChanged); }
                 };
                 function fileChanged(curr, prev) {
+                    // previous event kind check is to ensure we recongnize the file as previously also missing when it is restored or renamed twice (that is it disappears and reappears)
+                    // In such case, prevTime returned is same as prev time of event when file was deleted as per node documentation
                     var isPreviouslyDeleted = +prev.mtime === 0 || eventKind === FileWatcherEventKind.Deleted;
                     if (+curr.mtime === 0) {
                         if (isPreviouslyDeleted) {
+                            // Already deleted file, no need to callback again
                             return;
                         }
                         eventKind = FileWatcherEventKind.Deleted;
@@ -3381,10 +4098,12 @@ var ts;
                     else if (isPreviouslyDeleted) {
                         eventKind = FileWatcherEventKind.Created;
                     }
+                    // If there is no change in modified time, ignore the event
                     else if (+curr.mtime === +prev.mtime) {
                         return;
                     }
                     else {
+                        // File changed
                         eventKind = FileWatcherEventKind.Changed;
                     }
                     callback(fileName, eventKind);
@@ -3399,36 +4118,55 @@ var ts;
                         callback(fileName, fileExists(fileName) ? FileWatcherEventKind.Created : FileWatcherEventKind.Deleted);
                     }
                     else {
+                        // Change
                         callback(fileName, FileWatcherEventKind.Changed);
                     }
                 };
             }
             function createFsWatchCallbackForDirectoryWatcherCallback(directoryName, callback) {
                 return function (eventName, relativeFileName) {
+                    // In watchDirectory we only care about adding and removing files (when event name is
+                    // "rename"); changes made within files are handled by corresponding fileWatchers (when
+                    // event name is "change")
                     if (eventName === "rename") {
+                        // When deleting a file, the passed baseFileName is null
                         callback(!relativeFileName ? directoryName : ts.normalizePath(ts.combinePaths(directoryName, relativeFileName)));
                     }
                 };
             }
             function fsWatch(fileOrDirectory, entryKind, callback, recursive, fallbackPollingWatchFile, pollingInterval) {
                 var options;
+                /** Watcher for the file system entry depending on whether it is missing or present */
                 var watcher = !fileSystemEntryExists(fileOrDirectory, entryKind) ?
                     watchMissingFileSystemEntry() :
                     watchPresentFileSystemEntry();
                 return {
                     close: function () {
+                        // Close the watcher (either existing file system entry watcher or missing file system entry watcher)
                         watcher.close();
                         watcher = undefined;
                     }
                 };
+                /**
+                 * Invoke the callback with rename and update the watcher if not closed
+                 * @param createWatcher
+                 */
                 function invokeCallbackAndUpdateWatcher(createWatcher) {
+                    // Call the callback for current directory
                     callback("rename", "");
+                    // If watcher is not closed, update it
                     if (watcher) {
                         watcher.close();
                         watcher = createWatcher();
                     }
                 }
+                /**
+                 * Watch the file or directory that is currently present
+                 * and when the watched file or directory is deleted, switch to missing file system entry watcher
+                 */
                 function watchPresentFileSystemEntry() {
+                    // Node 4.0 `fs.watch` function supports the "recursive" option on both OSX and Windows
+                    // (ref: https://github.com/nodejs/node/pull/2649 and https://github.com/Microsoft/TypeScript/issues/4643)
                     if (options === undefined) {
                         if (isNode4OrLater && (process.platform === "win32" || process.platform === "darwin")) {
                             options = { persistent: true, recursive: !!recursive };
@@ -3439,32 +4177,47 @@ var ts;
                     }
                     try {
                         var presentWatcher = _fs.watch(fileOrDirectory, options, callback);
+                        // Watch the missing file or directory or error
                         presentWatcher.on("error", function () { return invokeCallbackAndUpdateWatcher(watchMissingFileSystemEntry); });
                         return presentWatcher;
                     }
                     catch (e) {
+                        // Catch the exception and use polling instead
+                        // Eg. on linux the number of watches are limited and one could easily exhaust watches and the exception ENOSPC is thrown when creating watcher at that point
+                        // so instead of throwing error, use fs.watchFile
                         return watchPresentFileSystemEntryWithFsWatchFile();
                     }
                 }
+                /**
+                 * Watch the file or directory using fs.watchFile since fs.watch threw exception
+                 * Eg. on linux the number of watches are limited and one could easily exhaust watches and the exception ENOSPC is thrown when creating watcher at that point
+                 */
                 function watchPresentFileSystemEntryWithFsWatchFile() {
                     return fallbackPollingWatchFile(fileOrDirectory, createFileWatcherCallback(callback), pollingInterval);
                 }
+                /**
+                 * Watch the file or directory that is missing
+                 * and switch to existing file or directory when the missing filesystem entry is created
+                 */
                 function watchMissingFileSystemEntry() {
                     return fallbackPollingWatchFile(fileOrDirectory, function (_fileName, eventKind) {
                         if (eventKind === FileWatcherEventKind.Created && fileSystemEntryExists(fileOrDirectory, entryKind)) {
+                            // Call the callback for current file or directory
+                            // For now it could be callback for the inner directory creation,
+                            // but just return current directory, better than current no-op
                             invokeCallbackAndUpdateWatcher(watchPresentFileSystemEntry);
                         }
                     }, pollingInterval);
                 }
             }
             function watchFileUsingFsWatch(fileName, callback, pollingInterval) {
-                return fsWatch(fileName, 0, createFsWatchCallbackForFileWatcherCallback(fileName, callback), false, fsWatchFile, pollingInterval);
+                return fsWatch(fileName, 0 /* File */, createFsWatchCallbackForFileWatcherCallback(fileName, callback), /*recursive*/ false, fsWatchFile, pollingInterval);
             }
             function createWatchFileUsingDynamicWatchFile(watchFile) {
-                return function (fileName, callback, pollingInterval) { return fsWatch(fileName, 0, createFsWatchCallbackForFileWatcherCallback(fileName, callback), false, watchFile, pollingInterval); };
+                return function (fileName, callback, pollingInterval) { return fsWatch(fileName, 0 /* File */, createFsWatchCallbackForFileWatcherCallback(fileName, callback), /*recursive*/ false, watchFile, pollingInterval); };
             }
             function fsWatchDirectory(directoryName, callback, recursive) {
-                return fsWatch(directoryName, 1, callback, !!recursive, fsWatchFile);
+                return fsWatch(directoryName, 1 /* Directory */, callback, !!recursive, fsWatchFile);
             }
             function watchDirectoryUsingFsWatch(directoryName, callback, recursive) {
                 return fsWatchDirectory(directoryName, createFsWatchCallbackForDirectoryWatcherCallback(directoryName, callback), recursive);
@@ -3479,7 +4232,9 @@ var ts;
                 var buffer = _fs.readFileSync(fileName);
                 var len = buffer.length;
                 if (len >= 2 && buffer[0] === 0xFE && buffer[1] === 0xFF) {
-                    len &= ~1;
+                    // Big endian UTF-16 byte order mark detected. Since big endian is not supported by node.js,
+                    // flip all byte pairs and treat as little endian.
+                    len &= ~1; // Round down to a multiple of 2
                     for (var i = 0; i < len; i += 2) {
                         var temp = buffer[i];
                         buffer[i] = buffer[i + 1];
@@ -3488,21 +4243,25 @@ var ts;
                     return buffer.toString("utf16le", 2);
                 }
                 if (len >= 2 && buffer[0] === 0xFF && buffer[1] === 0xFE) {
+                    // Little endian UTF-16 byte order mark detected
                     return buffer.toString("utf16le", 2);
                 }
                 if (len >= 3 && buffer[0] === 0xEF && buffer[1] === 0xBB && buffer[2] === 0xBF) {
+                    // UTF-8 byte order mark detected
                     return buffer.toString("utf8", 3);
                 }
+                // Default is UTF-8 with no byte order mark
                 return buffer.toString("utf8");
             }
             function writeFile(fileName, data, writeByteOrderMark) {
+                // If a BOM is required, emit one
                 if (writeByteOrderMark) {
                     data = byteOrderMarkIndicator + data;
                 }
                 var fd;
                 try {
                     fd = _fs.openSync(fileName, "w");
-                    _fs.writeSync(fd, data, undefined, "utf8");
+                    _fs.writeSync(fd, data, /*position*/ undefined, "utf8");
                 }
                 finally {
                     if (fd !== undefined) {
@@ -3517,6 +4276,8 @@ var ts;
                     var directories = [];
                     for (var _i = 0, entries_1 = entries; _i < entries_1.length; _i++) {
                         var entry = entries_1[_i];
+                        // This is necessary because on some file system node fails to exclude
+                        // "." and "..". See https://github.com/nodejs/node/issues/4002
                         if (entry === "." || entry === "..") {
                             continue;
                         }
@@ -3548,8 +4309,8 @@ var ts;
                 try {
                     var stat = _fs.statSync(path);
                     switch (entryKind) {
-                        case 0: return stat.isFile();
-                        case 1: return stat.isDirectory();
+                        case 0 /* File */: return stat.isFile();
+                        case 1 /* Directory */: return stat.isDirectory();
                         default: return false;
                     }
                 }
@@ -3558,13 +4319,13 @@ var ts;
                 }
             }
             function fileExists(path) {
-                return fileSystemEntryExists(path, 0);
+                return fileSystemEntryExists(path, 0 /* File */);
             }
             function directoryExists(path) {
-                return fileSystemEntryExists(path, 1);
+                return fileSystemEntryExists(path, 1 /* Directory */);
             }
             function getDirectories(path) {
-                return ts.filter(_fs.readdirSync(path), function (dir) { return fileSystemEntryExists(ts.combinePaths(path, dir), 1); });
+                return ts.filter(_fs.readdirSync(path), function (dir) { return fileSystemEntryExists(ts.combinePaths(path, dir), 1 /* Directory */); });
             }
             function realpath(path) {
                 try {
@@ -3582,6 +4343,26 @@ var ts;
                     return undefined;
                 }
             }
+            function setModifiedTime(path, time) {
+                try {
+                    _fs.utimesSync(path, time, time);
+                }
+                catch (e) {
+                    return;
+                }
+            }
+            function deleteFile(path) {
+                try {
+                    return _fs.unlinkSync(path);
+                }
+                catch (e) {
+                    return;
+                }
+            }
+            /**
+             * djb2 hashing algorithm
+             * http://www.cse.yorku.ca/~oz/hash.html
+             */
             function generateDjb2Hash(data) {
                 var chars = data.split("").map(function (str) { return str.charCodeAt(0); });
                 return "" + chars.reduce(function (prev, curr) { return ((prev << 5) + prev) + curr; }, 5381);
@@ -3605,9 +4386,11 @@ var ts;
                 useCaseSensitiveFileNames: !!ChakraHost.useCaseSensitiveFileNames,
                 write: ChakraHost.echo,
                 readFile: function (path, _encoding) {
+                    // encoding is automatically handled by the implementation in ChakraHost
                     return ChakraHost.readFile(path);
                 },
                 writeFile: function (path, data, writeByteOrderMark) {
+                    // If a BOM is required, emit one
                     if (writeByteOrderMark) {
                         data = byteOrderMarkIndicator + data;
                     }
@@ -3644,9 +4427,12 @@ var ts;
             sys = getChakraSystem();
         }
         else if (typeof process !== "undefined" && process.nextTick && !process.browser && typeof require !== "undefined") {
+            // process and process.nextTick checks if current environment is node-like
+            // process.browser check excludes webpack and browserify
             sys = getNodeSystem();
         }
         if (sys) {
+            // patch writefile to create folder before writing the file
             var originalWriteFile_1 = sys.writeFile;
             sys.writeFile = function (path, data, writeBom) {
                 var directoryPath = ts.getDirectoryPath(ts.normalizeSlashes(path));
@@ -3661,18 +4447,22 @@ var ts;
     if (ts.sys && ts.sys.getEnvironmentVariable) {
         setCustomPollingValues(ts.sys);
         ts.Debug.currentAssertionLevel = /^development$/i.test(ts.sys.getEnvironmentVariable("NODE_ENV"))
-            ? 1
-            : 0;
+            ? 1 /* Normal */
+            : 0 /* None */;
     }
     if (ts.sys && ts.sys.debugMode) {
         ts.Debug.isDebugging = true;
     }
 })(ts || (ts = {}));
+// <auto-generated />
+// generated from './diagnosticInformationMap.generated.ts' by 'src\parser'
+/* @internal */
 var ts;
 (function (ts) {
     function diag(code, category, key, message, reportsUnnecessary) {
         return { code: code, category: category, key: key, message: message, reportsUnnecessary: reportsUnnecessary };
     }
+    // tslint:disable-next-line variable-name
     ts.Diagnostics = {
         Unterminated_string_literal: diag(1002, ts.DiagnosticCategory.Error, "Unterminated_string_literal_1002", "Unterminated string literal."),
         Identifier_expected: diag(1003, ts.DiagnosticCategory.Error, "Identifier_expected_1003", "Identifier expected."),
@@ -4235,7 +5025,7 @@ var ts;
         _0_is_a_primitive_but_1_is_a_wrapper_object_Prefer_using_0_when_possible: diag(2692, ts.DiagnosticCategory.Error, "_0_is_a_primitive_but_1_is_a_wrapper_object_Prefer_using_0_when_possible_2692", "'{0}' is a primitive, but '{1}' is a wrapper object. Prefer using '{0}' when possible."),
         _0_only_refers_to_a_type_but_is_being_used_as_a_value_here: diag(2693, ts.DiagnosticCategory.Error, "_0_only_refers_to_a_type_but_is_being_used_as_a_value_here_2693", "'{0}' only refers to a type, but is being used as a value here."),
         Namespace_0_has_no_exported_member_1: diag(2694, ts.DiagnosticCategory.Error, "Namespace_0_has_no_exported_member_1_2694", "Namespace '{0}' has no exported member '{1}'."),
-        Left_side_of_comma_operator_is_unused_and_has_no_side_effects: diag(2695, ts.DiagnosticCategory.Error, "Left_side_of_comma_operator_is_unused_and_has_no_side_effects_2695", "Left side of comma operator is unused and has no side effects.", true),
+        Left_side_of_comma_operator_is_unused_and_has_no_side_effects: diag(2695, ts.DiagnosticCategory.Error, "Left_side_of_comma_operator_is_unused_and_has_no_side_effects_2695", "Left side of comma operator is unused and has no side effects.", /*reportsUnnecessary*/ true),
         The_Object_type_is_assignable_to_very_few_other_types_Did_you_mean_to_use_the_any_type_instead: diag(2696, ts.DiagnosticCategory.Error, "The_Object_type_is_assignable_to_very_few_other_types_Did_you_mean_to_use_the_any_type_instead_2696", "The 'Object' type is assignable to very few other types. Did you mean to use the 'any' type instead?"),
         An_async_function_or_method_must_return_a_Promise_Make_sure_you_have_a_declaration_for_Promise_or_include_ES2015_in_your_lib_option: diag(2697, ts.DiagnosticCategory.Error, "An_async_function_or_method_must_return_a_Promise_Make_sure_you_have_a_declaration_for_Promise_or_in_2697", "An async function or method must return a 'Promise'. Make sure you have a declaration for 'Promise' or include 'ES2015' in your `--lib` option."),
         Spread_types_may_only_be_created_from_object_types: diag(2698, ts.DiagnosticCategory.Error, "Spread_types_may_only_be_created_from_object_types_2698", "Spread types may only be created from object types."),
@@ -4266,6 +5056,8 @@ var ts;
         Cannot_invoke_an_object_which_is_possibly_null_or_undefined: diag(2723, ts.DiagnosticCategory.Error, "Cannot_invoke_an_object_which_is_possibly_null_or_undefined_2723", "Cannot invoke an object which is possibly 'null' or 'undefined'."),
         Module_0_has_no_exported_member_1_Did_you_mean_2: diag(2724, ts.DiagnosticCategory.Error, "Module_0_has_no_exported_member_1_Did_you_mean_2_2724", "Module '{0}' has no exported member '{1}'. Did you mean '{2}'?"),
         Class_name_cannot_be_Object_when_targeting_ES5_with_module_0: diag(2725, ts.DiagnosticCategory.Error, "Class_name_cannot_be_Object_when_targeting_ES5_with_module_0_2725", "Class name cannot be 'Object' when targeting ES5 with module {0}."),
+        Cannot_find_lib_definition_for_0: diag(2726, ts.DiagnosticCategory.Error, "Cannot_find_lib_definition_for_0_2726", "Cannot find lib definition for '{0}'."),
+        Cannot_find_lib_definition_for_0_Did_you_mean_1: diag(2727, ts.DiagnosticCategory.Error, "Cannot_find_lib_definition_for_0_Did_you_mean_1_2727", "Cannot find lib definition for '{0}'. Did you mean '{1}'?"),
         Import_declaration_0_is_using_private_name_1: diag(4000, ts.DiagnosticCategory.Error, "Import_declaration_0_is_using_private_name_1_4000", "Import declaration '{0}' is using private name '{1}'."),
         Type_parameter_0_of_exported_class_has_or_is_using_private_name_1: diag(4002, ts.DiagnosticCategory.Error, "Type_parameter_0_of_exported_class_has_or_is_using_private_name_1_4002", "Type parameter '{0}' of exported class has or is using private name '{1}'."),
         Type_parameter_0_of_exported_interface_has_or_is_using_private_name_1: diag(4004, ts.DiagnosticCategory.Error, "Type_parameter_0_of_exported_interface_has_or_is_using_private_name_1_4004", "Type parameter '{0}' of exported interface has or is using private name '{1}'."),
@@ -4499,12 +5291,12 @@ var ts;
         Resolving_real_path_for_0_result_1: diag(6130, ts.DiagnosticCategory.Message, "Resolving_real_path_for_0_result_1_6130", "Resolving real path for '{0}', result '{1}'."),
         Cannot_compile_modules_using_option_0_unless_the_module_flag_is_amd_or_system: diag(6131, ts.DiagnosticCategory.Error, "Cannot_compile_modules_using_option_0_unless_the_module_flag_is_amd_or_system_6131", "Cannot compile modules using option '{0}' unless the '--module' flag is 'amd' or 'system'."),
         File_name_0_has_a_1_extension_stripping_it: diag(6132, ts.DiagnosticCategory.Message, "File_name_0_has_a_1_extension_stripping_it_6132", "File name '{0}' has a '{1}' extension - stripping it."),
-        _0_is_declared_but_its_value_is_never_read: diag(6133, ts.DiagnosticCategory.Error, "_0_is_declared_but_its_value_is_never_read_6133", "'{0}' is declared but its value is never read.", true),
+        _0_is_declared_but_its_value_is_never_read: diag(6133, ts.DiagnosticCategory.Error, "_0_is_declared_but_its_value_is_never_read_6133", "'{0}' is declared but its value is never read.", /*reportsUnnecessary*/ true),
         Report_errors_on_unused_locals: diag(6134, ts.DiagnosticCategory.Message, "Report_errors_on_unused_locals_6134", "Report errors on unused locals."),
         Report_errors_on_unused_parameters: diag(6135, ts.DiagnosticCategory.Message, "Report_errors_on_unused_parameters_6135", "Report errors on unused parameters."),
         The_maximum_dependency_depth_to_search_under_node_modules_and_load_JavaScript_files: diag(6136, ts.DiagnosticCategory.Message, "The_maximum_dependency_depth_to_search_under_node_modules_and_load_JavaScript_files_6136", "The maximum dependency depth to search under node_modules and load JavaScript files."),
         Cannot_import_type_declaration_files_Consider_importing_0_instead_of_1: diag(6137, ts.DiagnosticCategory.Error, "Cannot_import_type_declaration_files_Consider_importing_0_instead_of_1_6137", "Cannot import type declaration files. Consider importing '{0}' instead of '{1}'."),
-        Property_0_is_declared_but_its_value_is_never_read: diag(6138, ts.DiagnosticCategory.Error, "Property_0_is_declared_but_its_value_is_never_read_6138", "Property '{0}' is declared but its value is never read.", true),
+        Property_0_is_declared_but_its_value_is_never_read: diag(6138, ts.DiagnosticCategory.Error, "Property_0_is_declared_but_its_value_is_never_read_6138", "Property '{0}' is declared but its value is never read.", /*reportsUnnecessary*/ true),
         Import_emit_helpers_from_tslib: diag(6139, ts.DiagnosticCategory.Message, "Import_emit_helpers_from_tslib_6139", "Import emit helpers from 'tslib'."),
         Auto_discovery_for_typings_is_enabled_in_project_0_Running_extra_resolution_pass_for_module_1_using_cache_location_2: diag(6140, ts.DiagnosticCategory.Error, "Auto_discovery_for_typings_is_enabled_in_project_0_Running_extra_resolution_pass_for_module_1_using__6140", "Auto discovery for typings is enabled in project '{0}'. Running extra resolution pass for module '{1}' using cache location '{2}'."),
         Parse_in_strict_mode_and_emit_use_strict_for_each_source_file: diag(6141, ts.DiagnosticCategory.Message, "Parse_in_strict_mode_and_emit_use_strict_for_each_source_file_6141", "Parse in strict mode and emit \"use strict\" for each source file."),
@@ -4557,14 +5349,14 @@ var ts;
         Multiple_consecutive_numeric_separators_are_not_permitted: diag(6189, ts.DiagnosticCategory.Error, "Multiple_consecutive_numeric_separators_are_not_permitted_6189", "Multiple consecutive numeric separators are not permitted."),
         Found_package_json_at_0_Package_ID_is_1: diag(6190, ts.DiagnosticCategory.Message, "Found_package_json_at_0_Package_ID_is_1_6190", "Found 'package.json' at '{0}'. Package ID is '{1}'."),
         Whether_to_keep_outdated_console_output_in_watch_mode_instead_of_clearing_the_screen: diag(6191, ts.DiagnosticCategory.Message, "Whether_to_keep_outdated_console_output_in_watch_mode_instead_of_clearing_the_screen_6191", "Whether to keep outdated console output in watch mode instead of clearing the screen."),
-        All_imports_in_import_declaration_are_unused: diag(6192, ts.DiagnosticCategory.Error, "All_imports_in_import_declaration_are_unused_6192", "All imports in import declaration are unused.", true),
+        All_imports_in_import_declaration_are_unused: diag(6192, ts.DiagnosticCategory.Error, "All_imports_in_import_declaration_are_unused_6192", "All imports in import declaration are unused.", /*reportsUnnecessary*/ true),
         Found_1_error_Watching_for_file_changes: diag(6193, ts.DiagnosticCategory.Message, "Found_1_error_Watching_for_file_changes_6193", "Found 1 error. Watching for file changes."),
         Found_0_errors_Watching_for_file_changes: diag(6194, ts.DiagnosticCategory.Message, "Found_0_errors_Watching_for_file_changes_6194", "Found {0} errors. Watching for file changes."),
         Resolve_keyof_to_string_valued_property_names_only_no_numbers_or_symbols: diag(6195, ts.DiagnosticCategory.Message, "Resolve_keyof_to_string_valued_property_names_only_no_numbers_or_symbols_6195", "Resolve 'keyof' to string valued property names only (no numbers or symbols)."),
-        _0_is_declared_but_never_used: diag(6196, ts.DiagnosticCategory.Error, "_0_is_declared_but_never_used_6196", "'{0}' is declared but never used.", true),
+        _0_is_declared_but_never_used: diag(6196, ts.DiagnosticCategory.Error, "_0_is_declared_but_never_used_6196", "'{0}' is declared but never used.", /*reportsUnnecessary*/ true),
         Include_modules_imported_with_json_extension: diag(6197, ts.DiagnosticCategory.Message, "Include_modules_imported_with_json_extension_6197", "Include modules imported with '.json' extension"),
-        All_destructured_elements_are_unused: diag(6198, ts.DiagnosticCategory.Error, "All_destructured_elements_are_unused_6198", "All destructured elements are unused.", true),
-        All_variables_are_unused: diag(6199, ts.DiagnosticCategory.Error, "All_variables_are_unused_6199", "All variables are unused.", true),
+        All_destructured_elements_are_unused: diag(6198, ts.DiagnosticCategory.Error, "All_destructured_elements_are_unused_6198", "All destructured elements are unused.", /*reportsUnnecessary*/ true),
+        All_variables_are_unused: diag(6199, ts.DiagnosticCategory.Error, "All_variables_are_unused_6199", "All variables are unused.", /*reportsUnnecessary*/ true),
         Projects_to_reference: diag(6300, ts.DiagnosticCategory.Message, "Projects_to_reference_6300", "Projects to reference"),
         Enable_project_compilation: diag(6302, ts.DiagnosticCategory.Message, "Enable_project_compilation_6302", "Enable project compilation"),
         Project_references_may_not_form_a_circular_graph_Cycle_detected_Colon_0: diag(6202, ts.DiagnosticCategory.Error, "Project_references_may_not_form_a_circular_graph_Cycle_detected_Colon_0_6202", "Project references may not form a circular graph. Cycle detected: {0}"),
@@ -4574,6 +5366,28 @@ var ts;
         File_0_is_not_in_project_file_list_Projects_must_list_all_files_or_use_an_include_pattern: diag(6307, ts.DiagnosticCategory.Error, "File_0_is_not_in_project_file_list_Projects_must_list_all_files_or_use_an_include_pattern_6307", "File '{0}' is not in project file list. Projects must list all files or use an 'include' pattern."),
         Cannot_prepend_project_0_because_it_does_not_have_outFile_set: diag(6308, ts.DiagnosticCategory.Error, "Cannot_prepend_project_0_because_it_does_not_have_outFile_set_6308", "Cannot prepend project '{0}' because it does not have 'outFile' set"),
         Output_file_0_from_project_1_does_not_exist: diag(6309, ts.DiagnosticCategory.Error, "Output_file_0_from_project_1_does_not_exist_6309", "Output file '{0}' from project '{1}' does not exist"),
+        Project_0_is_out_of_date_because_oldest_output_1_is_older_than_newest_input_2: diag(6350, ts.DiagnosticCategory.Message, "Project_0_is_out_of_date_because_oldest_output_1_is_older_than_newest_input_2_6350", "Project '{0}' is out of date because oldest output '{1}' is older than newest input '{2}'"),
+        Project_0_is_up_to_date_because_newest_input_1_is_older_than_oldest_output_2: diag(6351, ts.DiagnosticCategory.Message, "Project_0_is_up_to_date_because_newest_input_1_is_older_than_oldest_output_2_6351", "Project '{0}' is up to date because newest input '{1}' is older than oldest output '{2}'"),
+        Project_0_is_out_of_date_because_output_file_1_does_not_exist: diag(6352, ts.DiagnosticCategory.Message, "Project_0_is_out_of_date_because_output_file_1_does_not_exist_6352", "Project '{0}' is out of date because output file '{1}' does not exist"),
+        Project_0_is_out_of_date_because_its_dependency_1_is_out_of_date: diag(6353, ts.DiagnosticCategory.Message, "Project_0_is_out_of_date_because_its_dependency_1_is_out_of_date_6353", "Project '{0}' is out of date because its dependency '{1}' is out of date"),
+        Project_0_is_up_to_date_with_d_ts_files_from_its_dependencies: diag(6354, ts.DiagnosticCategory.Message, "Project_0_is_up_to_date_with_d_ts_files_from_its_dependencies_6354", "Project '{0}' is up to date with .d.ts files from its dependencies"),
+        Projects_in_this_build_Colon_0: diag(6355, ts.DiagnosticCategory.Message, "Projects_in_this_build_Colon_0_6355", "Projects in this build: {0}"),
+        A_non_dry_build_would_delete_the_following_files_Colon_0: diag(6356, ts.DiagnosticCategory.Message, "A_non_dry_build_would_delete_the_following_files_Colon_0_6356", "A non-dry build would delete the following files: {0}"),
+        A_non_dry_build_would_build_project_0: diag(6357, ts.DiagnosticCategory.Message, "A_non_dry_build_would_build_project_0_6357", "A non-dry build would build project '{0}'"),
+        Building_project_0: diag(6358, ts.DiagnosticCategory.Message, "Building_project_0_6358", "Building project '{0}'..."),
+        Updating_output_timestamps_of_project_0: diag(6359, ts.DiagnosticCategory.Message, "Updating_output_timestamps_of_project_0_6359", "Updating output timestamps of project '{0}'..."),
+        delete_this_Project_0_is_up_to_date_because_it_was_previously_built: diag(6360, ts.DiagnosticCategory.Message, "delete_this_Project_0_is_up_to_date_because_it_was_previously_built_6360", "delete this - Project '{0}' is up to date because it was previously built"),
+        Project_0_is_up_to_date: diag(6361, ts.DiagnosticCategory.Message, "Project_0_is_up_to_date_6361", "Project '{0}' is up to date"),
+        Skipping_build_of_project_0_because_its_dependency_1_has_errors: diag(6362, ts.DiagnosticCategory.Message, "Skipping_build_of_project_0_because_its_dependency_1_has_errors_6362", "Skipping build of project '{0}' because its dependency '{1}' has errors"),
+        Project_0_can_t_be_built_because_its_dependency_1_has_errors: diag(6363, ts.DiagnosticCategory.Message, "Project_0_can_t_be_built_because_its_dependency_1_has_errors_6363", "Project '{0}' can't be built because its dependency '{1}' has errors"),
+        Build_one_or_more_projects_and_their_dependencies_if_out_of_date: diag(6364, ts.DiagnosticCategory.Message, "Build_one_or_more_projects_and_their_dependencies_if_out_of_date_6364", "Build one or more projects and their dependencies, if out of date"),
+        Delete_the_outputs_of_all_projects: diag(6365, ts.DiagnosticCategory.Message, "Delete_the_outputs_of_all_projects_6365", "Delete the outputs of all projects"),
+        Enable_verbose_logging: diag(6366, ts.DiagnosticCategory.Message, "Enable_verbose_logging_6366", "Enable verbose logging"),
+        Show_what_would_be_built_or_deleted_if_specified_with_clean: diag(6367, ts.DiagnosticCategory.Message, "Show_what_would_be_built_or_deleted_if_specified_with_clean_6367", "Show what would be built (or deleted, if specified with '--clean')"),
+        Build_all_projects_including_those_that_appear_to_be_up_to_date: diag(6368, ts.DiagnosticCategory.Message, "Build_all_projects_including_those_that_appear_to_be_up_to_date_6368", "Build all projects, including those that appear to be up to date"),
+        Option_build_must_be_the_first_command_line_argument: diag(6369, ts.DiagnosticCategory.Error, "Option_build_must_be_the_first_command_line_argument_6369", "Option '--build' must be the first command line argument."),
+        Options_0_and_1_cannot_be_combined: diag(6370, ts.DiagnosticCategory.Error, "Options_0_and_1_cannot_be_combined_6370", "Options '{0}' and '{1}' cannot be combined."),
+        Skipping_clean_because_not_all_projects_could_be_located: diag(6371, ts.DiagnosticCategory.Error, "Skipping_clean_because_not_all_projects_could_be_located_6371", "Skipping clean because not all projects could be located"),
         Variable_0_implicitly_has_an_1_type: diag(7005, ts.DiagnosticCategory.Error, "Variable_0_implicitly_has_an_1_type_7005", "Variable '{0}' implicitly has an '{1}' type."),
         Parameter_0_implicitly_has_an_1_type: diag(7006, ts.DiagnosticCategory.Error, "Parameter_0_implicitly_has_an_1_type_7006", "Parameter '{0}' implicitly has an '{1}' type."),
         Member_0_implicitly_has_an_1_type: diag(7008, ts.DiagnosticCategory.Error, "Member_0_implicitly_has_an_1_type_7008", "Member '{0}' implicitly has an '{1}' type."),
@@ -4592,8 +5406,8 @@ var ts;
         Function_implicitly_has_return_type_any_because_it_does_not_have_a_return_type_annotation_and_is_referenced_directly_or_indirectly_in_one_of_its_return_expressions: diag(7024, ts.DiagnosticCategory.Error, "Function_implicitly_has_return_type_any_because_it_does_not_have_a_return_type_annotation_and_is_ref_7024", "Function implicitly has return type 'any' because it does not have a return type annotation and is referenced directly or indirectly in one of its return expressions."),
         Generator_implicitly_has_type_0_because_it_does_not_yield_any_values_Consider_supplying_a_return_type: diag(7025, ts.DiagnosticCategory.Error, "Generator_implicitly_has_type_0_because_it_does_not_yield_any_values_Consider_supplying_a_return_typ_7025", "Generator implicitly has type '{0}' because it does not yield any values. Consider supplying a return type."),
         JSX_element_implicitly_has_type_any_because_no_interface_JSX_0_exists: diag(7026, ts.DiagnosticCategory.Error, "JSX_element_implicitly_has_type_any_because_no_interface_JSX_0_exists_7026", "JSX element implicitly has type 'any' because no interface 'JSX.{0}' exists."),
-        Unreachable_code_detected: diag(7027, ts.DiagnosticCategory.Error, "Unreachable_code_detected_7027", "Unreachable code detected.", true),
-        Unused_label: diag(7028, ts.DiagnosticCategory.Error, "Unused_label_7028", "Unused label.", true),
+        Unreachable_code_detected: diag(7027, ts.DiagnosticCategory.Error, "Unreachable_code_detected_7027", "Unreachable code detected.", /*reportsUnnecessary*/ true),
+        Unused_label: diag(7028, ts.DiagnosticCategory.Error, "Unused_label_7028", "Unused label.", /*reportsUnnecessary*/ true),
         Fallthrough_case_in_switch: diag(7029, ts.DiagnosticCategory.Error, "Fallthrough_case_in_switch_7029", "Fallthrough case in switch."),
         Not_all_code_paths_return_a_value: diag(7030, ts.DiagnosticCategory.Error, "Not_all_code_paths_return_a_value_7030", "Not all code paths return a value."),
         Binding_element_0_implicitly_has_an_1_type: diag(7031, ts.DiagnosticCategory.Error, "Binding_element_0_implicitly_has_an_1_type_7031", "Binding element '{0}' implicitly has an '{1}' type."),
@@ -4749,6 +5563,1918 @@ var ts;
     };
 })(ts || (ts = {}));
 var ts;
+(function (ts) {
+    /* @internal */
+    function tokenIsIdentifierOrKeyword(token) {
+        return token >= 71 /* Identifier */;
+    }
+    ts.tokenIsIdentifierOrKeyword = tokenIsIdentifierOrKeyword;
+    /* @internal */
+    function tokenIsIdentifierOrKeywordOrGreaterThan(token) {
+        return token === 29 /* GreaterThanToken */ || tokenIsIdentifierOrKeyword(token);
+    }
+    ts.tokenIsIdentifierOrKeywordOrGreaterThan = tokenIsIdentifierOrKeywordOrGreaterThan;
+    var textToToken = ts.createMapFromTemplate({
+        "abstract": 117 /* AbstractKeyword */,
+        "any": 119 /* AnyKeyword */,
+        "as": 118 /* AsKeyword */,
+        "boolean": 122 /* BooleanKeyword */,
+        "break": 72 /* BreakKeyword */,
+        "case": 73 /* CaseKeyword */,
+        "catch": 74 /* CatchKeyword */,
+        "class": 75 /* ClassKeyword */,
+        "continue": 77 /* ContinueKeyword */,
+        "const": 76 /* ConstKeyword */,
+        "constructor": 123 /* ConstructorKeyword */,
+        "debugger": 78 /* DebuggerKeyword */,
+        "declare": 124 /* DeclareKeyword */,
+        "default": 79 /* DefaultKeyword */,
+        "delete": 80 /* DeleteKeyword */,
+        "do": 81 /* DoKeyword */,
+        "else": 82 /* ElseKeyword */,
+        "enum": 83 /* EnumKeyword */,
+        "export": 84 /* ExportKeyword */,
+        "extends": 85 /* ExtendsKeyword */,
+        "false": 86 /* FalseKeyword */,
+        "finally": 87 /* FinallyKeyword */,
+        "for": 88 /* ForKeyword */,
+        "from": 143 /* FromKeyword */,
+        "function": 89 /* FunctionKeyword */,
+        "get": 125 /* GetKeyword */,
+        "if": 90 /* IfKeyword */,
+        "implements": 108 /* ImplementsKeyword */,
+        "import": 91 /* ImportKeyword */,
+        "in": 92 /* InKeyword */,
+        "infer": 126 /* InferKeyword */,
+        "instanceof": 93 /* InstanceOfKeyword */,
+        "interface": 109 /* InterfaceKeyword */,
+        "is": 127 /* IsKeyword */,
+        "keyof": 128 /* KeyOfKeyword */,
+        "let": 110 /* LetKeyword */,
+        "module": 129 /* ModuleKeyword */,
+        "namespace": 130 /* NamespaceKeyword */,
+        "never": 131 /* NeverKeyword */,
+        "new": 94 /* NewKeyword */,
+        "null": 95 /* NullKeyword */,
+        "number": 134 /* NumberKeyword */,
+        "object": 135 /* ObjectKeyword */,
+        "package": 111 /* PackageKeyword */,
+        "private": 112 /* PrivateKeyword */,
+        "protected": 113 /* ProtectedKeyword */,
+        "public": 114 /* PublicKeyword */,
+        "readonly": 132 /* ReadonlyKeyword */,
+        "require": 133 /* RequireKeyword */,
+        "global": 144 /* GlobalKeyword */,
+        "return": 96 /* ReturnKeyword */,
+        "set": 136 /* SetKeyword */,
+        "static": 115 /* StaticKeyword */,
+        "string": 137 /* StringKeyword */,
+        "super": 97 /* SuperKeyword */,
+        "switch": 98 /* SwitchKeyword */,
+        "symbol": 138 /* SymbolKeyword */,
+        "this": 99 /* ThisKeyword */,
+        "throw": 100 /* ThrowKeyword */,
+        "true": 101 /* TrueKeyword */,
+        "try": 102 /* TryKeyword */,
+        "type": 139 /* TypeKeyword */,
+        "typeof": 103 /* TypeOfKeyword */,
+        "undefined": 140 /* UndefinedKeyword */,
+        "unique": 141 /* UniqueKeyword */,
+        "unknown": 142 /* UnknownKeyword */,
+        "var": 104 /* VarKeyword */,
+        "void": 105 /* VoidKeyword */,
+        "while": 106 /* WhileKeyword */,
+        "with": 107 /* WithKeyword */,
+        "yield": 116 /* YieldKeyword */,
+        "async": 120 /* AsyncKeyword */,
+        "await": 121 /* AwaitKeyword */,
+        "of": 145 /* OfKeyword */,
+        "{": 17 /* OpenBraceToken */,
+        "}": 18 /* CloseBraceToken */,
+        "(": 19 /* OpenParenToken */,
+        ")": 20 /* CloseParenToken */,
+        "[": 21 /* OpenBracketToken */,
+        "]": 22 /* CloseBracketToken */,
+        ".": 23 /* DotToken */,
+        "...": 24 /* DotDotDotToken */,
+        ";": 25 /* SemicolonToken */,
+        ",": 26 /* CommaToken */,
+        "<": 27 /* LessThanToken */,
+        ">": 29 /* GreaterThanToken */,
+        "<=": 30 /* LessThanEqualsToken */,
+        ">=": 31 /* GreaterThanEqualsToken */,
+        "==": 32 /* EqualsEqualsToken */,
+        "!=": 33 /* ExclamationEqualsToken */,
+        "===": 34 /* EqualsEqualsEqualsToken */,
+        "!==": 35 /* ExclamationEqualsEqualsToken */,
+        "=>": 36 /* EqualsGreaterThanToken */,
+        "+": 37 /* PlusToken */,
+        "-": 38 /* MinusToken */,
+        "**": 40 /* AsteriskAsteriskToken */,
+        "*": 39 /* AsteriskToken */,
+        "/": 41 /* SlashToken */,
+        "%": 42 /* PercentToken */,
+        "++": 43 /* PlusPlusToken */,
+        "--": 44 /* MinusMinusToken */,
+        "<<": 45 /* LessThanLessThanToken */,
+        "</": 28 /* LessThanSlashToken */,
+        ">>": 46 /* GreaterThanGreaterThanToken */,
+        ">>>": 47 /* GreaterThanGreaterThanGreaterThanToken */,
+        "&": 48 /* AmpersandToken */,
+        "|": 49 /* BarToken */,
+        "^": 50 /* CaretToken */,
+        "!": 51 /* ExclamationToken */,
+        "~": 52 /* TildeToken */,
+        "&&": 53 /* AmpersandAmpersandToken */,
+        "||": 54 /* BarBarToken */,
+        "?": 55 /* QuestionToken */,
+        ":": 56 /* ColonToken */,
+        "=": 58 /* EqualsToken */,
+        "+=": 59 /* PlusEqualsToken */,
+        "-=": 60 /* MinusEqualsToken */,
+        "*=": 61 /* AsteriskEqualsToken */,
+        "**=": 62 /* AsteriskAsteriskEqualsToken */,
+        "/=": 63 /* SlashEqualsToken */,
+        "%=": 64 /* PercentEqualsToken */,
+        "<<=": 65 /* LessThanLessThanEqualsToken */,
+        ">>=": 66 /* GreaterThanGreaterThanEqualsToken */,
+        ">>>=": 67 /* GreaterThanGreaterThanGreaterThanEqualsToken */,
+        "&=": 68 /* AmpersandEqualsToken */,
+        "|=": 69 /* BarEqualsToken */,
+        "^=": 70 /* CaretEqualsToken */,
+        "@": 57 /* AtToken */,
+    });
+    /*
+        As per ECMAScript Language Specification 3th Edition, Section 7.6: Identifiers
+        IdentifierStart ::
+            Can contain Unicode 3.0.0 categories:
+            Uppercase letter (Lu),
+            Lowercase letter (Ll),
+            Titlecase letter (Lt),
+            Modifier letter (Lm),
+            Other letter (Lo), or
+            Letter number (Nl).
+        IdentifierPart :: =
+            Can contain IdentifierStart + Unicode 3.0.0 categories:
+            Non-spacing mark (Mn),
+            Combining spacing mark (Mc),
+            Decimal number (Nd), or
+            Connector punctuation (Pc).
+
+        Codepoint ranges for ES3 Identifiers are extracted from the Unicode 3.0.0 specification at:
+        http://www.unicode.org/Public/3.0-Update/UnicodeData-3.0.0.txt
+    */
+    var unicodeES3IdentifierStart = [170, 170, 181, 181, 186, 186, 192, 214, 216, 246, 248, 543, 546, 563, 592, 685, 688, 696, 699, 705, 720, 721, 736, 740, 750, 750, 890, 890, 902, 902, 904, 906, 908, 908, 910, 929, 931, 974, 976, 983, 986, 1011, 1024, 1153, 1164, 1220, 1223, 1224, 1227, 1228, 1232, 1269, 1272, 1273, 1329, 1366, 1369, 1369, 1377, 1415, 1488, 1514, 1520, 1522, 1569, 1594, 1600, 1610, 1649, 1747, 1749, 1749, 1765, 1766, 1786, 1788, 1808, 1808, 1810, 1836, 1920, 1957, 2309, 2361, 2365, 2365, 2384, 2384, 2392, 2401, 2437, 2444, 2447, 2448, 2451, 2472, 2474, 2480, 2482, 2482, 2486, 2489, 2524, 2525, 2527, 2529, 2544, 2545, 2565, 2570, 2575, 2576, 2579, 2600, 2602, 2608, 2610, 2611, 2613, 2614, 2616, 2617, 2649, 2652, 2654, 2654, 2674, 2676, 2693, 2699, 2701, 2701, 2703, 2705, 2707, 2728, 2730, 2736, 2738, 2739, 2741, 2745, 2749, 2749, 2768, 2768, 2784, 2784, 2821, 2828, 2831, 2832, 2835, 2856, 2858, 2864, 2866, 2867, 2870, 2873, 2877, 2877, 2908, 2909, 2911, 2913, 2949, 2954, 2958, 2960, 2962, 2965, 2969, 2970, 2972, 2972, 2974, 2975, 2979, 2980, 2984, 2986, 2990, 2997, 2999, 3001, 3077, 3084, 3086, 3088, 3090, 3112, 3114, 3123, 3125, 3129, 3168, 3169, 3205, 3212, 3214, 3216, 3218, 3240, 3242, 3251, 3253, 3257, 3294, 3294, 3296, 3297, 3333, 3340, 3342, 3344, 3346, 3368, 3370, 3385, 3424, 3425, 3461, 3478, 3482, 3505, 3507, 3515, 3517, 3517, 3520, 3526, 3585, 3632, 3634, 3635, 3648, 3654, 3713, 3714, 3716, 3716, 3719, 3720, 3722, 3722, 3725, 3725, 3732, 3735, 3737, 3743, 3745, 3747, 3749, 3749, 3751, 3751, 3754, 3755, 3757, 3760, 3762, 3763, 3773, 3773, 3776, 3780, 3782, 3782, 3804, 3805, 3840, 3840, 3904, 3911, 3913, 3946, 3976, 3979, 4096, 4129, 4131, 4135, 4137, 4138, 4176, 4181, 4256, 4293, 4304, 4342, 4352, 4441, 4447, 4514, 4520, 4601, 4608, 4614, 4616, 4678, 4680, 4680, 4682, 4685, 4688, 4694, 4696, 4696, 4698, 4701, 4704, 4742, 4744, 4744, 4746, 4749, 4752, 4782, 4784, 4784, 4786, 4789, 4792, 4798, 4800, 4800, 4802, 4805, 4808, 4814, 4816, 4822, 4824, 4846, 4848, 4878, 4880, 4880, 4882, 4885, 4888, 4894, 4896, 4934, 4936, 4954, 5024, 5108, 5121, 5740, 5743, 5750, 5761, 5786, 5792, 5866, 6016, 6067, 6176, 6263, 6272, 6312, 7680, 7835, 7840, 7929, 7936, 7957, 7960, 7965, 7968, 8005, 8008, 8013, 8016, 8023, 8025, 8025, 8027, 8027, 8029, 8029, 8031, 8061, 8064, 8116, 8118, 8124, 8126, 8126, 8130, 8132, 8134, 8140, 8144, 8147, 8150, 8155, 8160, 8172, 8178, 8180, 8182, 8188, 8319, 8319, 8450, 8450, 8455, 8455, 8458, 8467, 8469, 8469, 8473, 8477, 8484, 8484, 8486, 8486, 8488, 8488, 8490, 8493, 8495, 8497, 8499, 8505, 8544, 8579, 12293, 12295, 12321, 12329, 12337, 12341, 12344, 12346, 12353, 12436, 12445, 12446, 12449, 12538, 12540, 12542, 12549, 12588, 12593, 12686, 12704, 12727, 13312, 19893, 19968, 40869, 40960, 42124, 44032, 55203, 63744, 64045, 64256, 64262, 64275, 64279, 64285, 64285, 64287, 64296, 64298, 64310, 64312, 64316, 64318, 64318, 64320, 64321, 64323, 64324, 64326, 64433, 64467, 64829, 64848, 64911, 64914, 64967, 65008, 65019, 65136, 65138, 65140, 65140, 65142, 65276, 65313, 65338, 65345, 65370, 65382, 65470, 65474, 65479, 65482, 65487, 65490, 65495, 65498, 65500,];
+    var unicodeES3IdentifierPart = [170, 170, 181, 181, 186, 186, 192, 214, 216, 246, 248, 543, 546, 563, 592, 685, 688, 696, 699, 705, 720, 721, 736, 740, 750, 750, 768, 846, 864, 866, 890, 890, 902, 902, 904, 906, 908, 908, 910, 929, 931, 974, 976, 983, 986, 1011, 1024, 1153, 1155, 1158, 1164, 1220, 1223, 1224, 1227, 1228, 1232, 1269, 1272, 1273, 1329, 1366, 1369, 1369, 1377, 1415, 1425, 1441, 1443, 1465, 1467, 1469, 1471, 1471, 1473, 1474, 1476, 1476, 1488, 1514, 1520, 1522, 1569, 1594, 1600, 1621, 1632, 1641, 1648, 1747, 1749, 1756, 1759, 1768, 1770, 1773, 1776, 1788, 1808, 1836, 1840, 1866, 1920, 1968, 2305, 2307, 2309, 2361, 2364, 2381, 2384, 2388, 2392, 2403, 2406, 2415, 2433, 2435, 2437, 2444, 2447, 2448, 2451, 2472, 2474, 2480, 2482, 2482, 2486, 2489, 2492, 2492, 2494, 2500, 2503, 2504, 2507, 2509, 2519, 2519, 2524, 2525, 2527, 2531, 2534, 2545, 2562, 2562, 2565, 2570, 2575, 2576, 2579, 2600, 2602, 2608, 2610, 2611, 2613, 2614, 2616, 2617, 2620, 2620, 2622, 2626, 2631, 2632, 2635, 2637, 2649, 2652, 2654, 2654, 2662, 2676, 2689, 2691, 2693, 2699, 2701, 2701, 2703, 2705, 2707, 2728, 2730, 2736, 2738, 2739, 2741, 2745, 2748, 2757, 2759, 2761, 2763, 2765, 2768, 2768, 2784, 2784, 2790, 2799, 2817, 2819, 2821, 2828, 2831, 2832, 2835, 2856, 2858, 2864, 2866, 2867, 2870, 2873, 2876, 2883, 2887, 2888, 2891, 2893, 2902, 2903, 2908, 2909, 2911, 2913, 2918, 2927, 2946, 2947, 2949, 2954, 2958, 2960, 2962, 2965, 2969, 2970, 2972, 2972, 2974, 2975, 2979, 2980, 2984, 2986, 2990, 2997, 2999, 3001, 3006, 3010, 3014, 3016, 3018, 3021, 3031, 3031, 3047, 3055, 3073, 3075, 3077, 3084, 3086, 3088, 3090, 3112, 3114, 3123, 3125, 3129, 3134, 3140, 3142, 3144, 3146, 3149, 3157, 3158, 3168, 3169, 3174, 3183, 3202, 3203, 3205, 3212, 3214, 3216, 3218, 3240, 3242, 3251, 3253, 3257, 3262, 3268, 3270, 3272, 3274, 3277, 3285, 3286, 3294, 3294, 3296, 3297, 3302, 3311, 3330, 3331, 3333, 3340, 3342, 3344, 3346, 3368, 3370, 3385, 3390, 3395, 3398, 3400, 3402, 3405, 3415, 3415, 3424, 3425, 3430, 3439, 3458, 3459, 3461, 3478, 3482, 3505, 3507, 3515, 3517, 3517, 3520, 3526, 3530, 3530, 3535, 3540, 3542, 3542, 3544, 3551, 3570, 3571, 3585, 3642, 3648, 3662, 3664, 3673, 3713, 3714, 3716, 3716, 3719, 3720, 3722, 3722, 3725, 3725, 3732, 3735, 3737, 3743, 3745, 3747, 3749, 3749, 3751, 3751, 3754, 3755, 3757, 3769, 3771, 3773, 3776, 3780, 3782, 3782, 3784, 3789, 3792, 3801, 3804, 3805, 3840, 3840, 3864, 3865, 3872, 3881, 3893, 3893, 3895, 3895, 3897, 3897, 3902, 3911, 3913, 3946, 3953, 3972, 3974, 3979, 3984, 3991, 3993, 4028, 4038, 4038, 4096, 4129, 4131, 4135, 4137, 4138, 4140, 4146, 4150, 4153, 4160, 4169, 4176, 4185, 4256, 4293, 4304, 4342, 4352, 4441, 4447, 4514, 4520, 4601, 4608, 4614, 4616, 4678, 4680, 4680, 4682, 4685, 4688, 4694, 4696, 4696, 4698, 4701, 4704, 4742, 4744, 4744, 4746, 4749, 4752, 4782, 4784, 4784, 4786, 4789, 4792, 4798, 4800, 4800, 4802, 4805, 4808, 4814, 4816, 4822, 4824, 4846, 4848, 4878, 4880, 4880, 4882, 4885, 4888, 4894, 4896, 4934, 4936, 4954, 4969, 4977, 5024, 5108, 5121, 5740, 5743, 5750, 5761, 5786, 5792, 5866, 6016, 6099, 6112, 6121, 6160, 6169, 6176, 6263, 6272, 6313, 7680, 7835, 7840, 7929, 7936, 7957, 7960, 7965, 7968, 8005, 8008, 8013, 8016, 8023, 8025, 8025, 8027, 8027, 8029, 8029, 8031, 8061, 8064, 8116, 8118, 8124, 8126, 8126, 8130, 8132, 8134, 8140, 8144, 8147, 8150, 8155, 8160, 8172, 8178, 8180, 8182, 8188, 8255, 8256, 8319, 8319, 8400, 8412, 8417, 8417, 8450, 8450, 8455, 8455, 8458, 8467, 8469, 8469, 8473, 8477, 8484, 8484, 8486, 8486, 8488, 8488, 8490, 8493, 8495, 8497, 8499, 8505, 8544, 8579, 12293, 12295, 12321, 12335, 12337, 12341, 12344, 12346, 12353, 12436, 12441, 12442, 12445, 12446, 12449, 12542, 12549, 12588, 12593, 12686, 12704, 12727, 13312, 19893, 19968, 40869, 40960, 42124, 44032, 55203, 63744, 64045, 64256, 64262, 64275, 64279, 64285, 64296, 64298, 64310, 64312, 64316, 64318, 64318, 64320, 64321, 64323, 64324, 64326, 64433, 64467, 64829, 64848, 64911, 64914, 64967, 65008, 65019, 65056, 65059, 65075, 65076, 65101, 65103, 65136, 65138, 65140, 65140, 65142, 65276, 65296, 65305, 65313, 65338, 65343, 65343, 65345, 65370, 65381, 65470, 65474, 65479, 65482, 65487, 65490, 65495, 65498, 65500,];
+    /*
+        As per ECMAScript Language Specification 5th Edition, Section 7.6: ISyntaxToken Names and Identifiers
+        IdentifierStart ::
+            Can contain Unicode 6.2 categories:
+            Uppercase letter (Lu),
+            Lowercase letter (Ll),
+            Titlecase letter (Lt),
+            Modifier letter (Lm),
+            Other letter (Lo), or
+            Letter number (Nl).
+        IdentifierPart ::
+            Can contain IdentifierStart + Unicode 6.2 categories:
+            Non-spacing mark (Mn),
+            Combining spacing mark (Mc),
+            Decimal number (Nd),
+            Connector punctuation (Pc),
+            <ZWNJ>, or
+            <ZWJ>.
+
+        Codepoint ranges for ES5 Identifiers are extracted from the Unicode 6.2 specification at:
+        http://www.unicode.org/Public/6.2.0/ucd/UnicodeData.txt
+    */
+    var unicodeES5IdentifierStart = [170, 170, 181, 181, 186, 186, 192, 214, 216, 246, 248, 705, 710, 721, 736, 740, 748, 748, 750, 750, 880, 884, 886, 887, 890, 893, 902, 902, 904, 906, 908, 908, 910, 929, 931, 1013, 1015, 1153, 1162, 1319, 1329, 1366, 1369, 1369, 1377, 1415, 1488, 1514, 1520, 1522, 1568, 1610, 1646, 1647, 1649, 1747, 1749, 1749, 1765, 1766, 1774, 1775, 1786, 1788, 1791, 1791, 1808, 1808, 1810, 1839, 1869, 1957, 1969, 1969, 1994, 2026, 2036, 2037, 2042, 2042, 2048, 2069, 2074, 2074, 2084, 2084, 2088, 2088, 2112, 2136, 2208, 2208, 2210, 2220, 2308, 2361, 2365, 2365, 2384, 2384, 2392, 2401, 2417, 2423, 2425, 2431, 2437, 2444, 2447, 2448, 2451, 2472, 2474, 2480, 2482, 2482, 2486, 2489, 2493, 2493, 2510, 2510, 2524, 2525, 2527, 2529, 2544, 2545, 2565, 2570, 2575, 2576, 2579, 2600, 2602, 2608, 2610, 2611, 2613, 2614, 2616, 2617, 2649, 2652, 2654, 2654, 2674, 2676, 2693, 2701, 2703, 2705, 2707, 2728, 2730, 2736, 2738, 2739, 2741, 2745, 2749, 2749, 2768, 2768, 2784, 2785, 2821, 2828, 2831, 2832, 2835, 2856, 2858, 2864, 2866, 2867, 2869, 2873, 2877, 2877, 2908, 2909, 2911, 2913, 2929, 2929, 2947, 2947, 2949, 2954, 2958, 2960, 2962, 2965, 2969, 2970, 2972, 2972, 2974, 2975, 2979, 2980, 2984, 2986, 2990, 3001, 3024, 3024, 3077, 3084, 3086, 3088, 3090, 3112, 3114, 3123, 3125, 3129, 3133, 3133, 3160, 3161, 3168, 3169, 3205, 3212, 3214, 3216, 3218, 3240, 3242, 3251, 3253, 3257, 3261, 3261, 3294, 3294, 3296, 3297, 3313, 3314, 3333, 3340, 3342, 3344, 3346, 3386, 3389, 3389, 3406, 3406, 3424, 3425, 3450, 3455, 3461, 3478, 3482, 3505, 3507, 3515, 3517, 3517, 3520, 3526, 3585, 3632, 3634, 3635, 3648, 3654, 3713, 3714, 3716, 3716, 3719, 3720, 3722, 3722, 3725, 3725, 3732, 3735, 3737, 3743, 3745, 3747, 3749, 3749, 3751, 3751, 3754, 3755, 3757, 3760, 3762, 3763, 3773, 3773, 3776, 3780, 3782, 3782, 3804, 3807, 3840, 3840, 3904, 3911, 3913, 3948, 3976, 3980, 4096, 4138, 4159, 4159, 4176, 4181, 4186, 4189, 4193, 4193, 4197, 4198, 4206, 4208, 4213, 4225, 4238, 4238, 4256, 4293, 4295, 4295, 4301, 4301, 4304, 4346, 4348, 4680, 4682, 4685, 4688, 4694, 4696, 4696, 4698, 4701, 4704, 4744, 4746, 4749, 4752, 4784, 4786, 4789, 4792, 4798, 4800, 4800, 4802, 4805, 4808, 4822, 4824, 4880, 4882, 4885, 4888, 4954, 4992, 5007, 5024, 5108, 5121, 5740, 5743, 5759, 5761, 5786, 5792, 5866, 5870, 5872, 5888, 5900, 5902, 5905, 5920, 5937, 5952, 5969, 5984, 5996, 5998, 6000, 6016, 6067, 6103, 6103, 6108, 6108, 6176, 6263, 6272, 6312, 6314, 6314, 6320, 6389, 6400, 6428, 6480, 6509, 6512, 6516, 6528, 6571, 6593, 6599, 6656, 6678, 6688, 6740, 6823, 6823, 6917, 6963, 6981, 6987, 7043, 7072, 7086, 7087, 7098, 7141, 7168, 7203, 7245, 7247, 7258, 7293, 7401, 7404, 7406, 7409, 7413, 7414, 7424, 7615, 7680, 7957, 7960, 7965, 7968, 8005, 8008, 8013, 8016, 8023, 8025, 8025, 8027, 8027, 8029, 8029, 8031, 8061, 8064, 8116, 8118, 8124, 8126, 8126, 8130, 8132, 8134, 8140, 8144, 8147, 8150, 8155, 8160, 8172, 8178, 8180, 8182, 8188, 8305, 8305, 8319, 8319, 8336, 8348, 8450, 8450, 8455, 8455, 8458, 8467, 8469, 8469, 8473, 8477, 8484, 8484, 8486, 8486, 8488, 8488, 8490, 8493, 8495, 8505, 8508, 8511, 8517, 8521, 8526, 8526, 8544, 8584, 11264, 11310, 11312, 11358, 11360, 11492, 11499, 11502, 11506, 11507, 11520, 11557, 11559, 11559, 11565, 11565, 11568, 11623, 11631, 11631, 11648, 11670, 11680, 11686, 11688, 11694, 11696, 11702, 11704, 11710, 11712, 11718, 11720, 11726, 11728, 11734, 11736, 11742, 11823, 11823, 12293, 12295, 12321, 12329, 12337, 12341, 12344, 12348, 12353, 12438, 12445, 12447, 12449, 12538, 12540, 12543, 12549, 12589, 12593, 12686, 12704, 12730, 12784, 12799, 13312, 19893, 19968, 40908, 40960, 42124, 42192, 42237, 42240, 42508, 42512, 42527, 42538, 42539, 42560, 42606, 42623, 42647, 42656, 42735, 42775, 42783, 42786, 42888, 42891, 42894, 42896, 42899, 42912, 42922, 43000, 43009, 43011, 43013, 43015, 43018, 43020, 43042, 43072, 43123, 43138, 43187, 43250, 43255, 43259, 43259, 43274, 43301, 43312, 43334, 43360, 43388, 43396, 43442, 43471, 43471, 43520, 43560, 43584, 43586, 43588, 43595, 43616, 43638, 43642, 43642, 43648, 43695, 43697, 43697, 43701, 43702, 43705, 43709, 43712, 43712, 43714, 43714, 43739, 43741, 43744, 43754, 43762, 43764, 43777, 43782, 43785, 43790, 43793, 43798, 43808, 43814, 43816, 43822, 43968, 44002, 44032, 55203, 55216, 55238, 55243, 55291, 63744, 64109, 64112, 64217, 64256, 64262, 64275, 64279, 64285, 64285, 64287, 64296, 64298, 64310, 64312, 64316, 64318, 64318, 64320, 64321, 64323, 64324, 64326, 64433, 64467, 64829, 64848, 64911, 64914, 64967, 65008, 65019, 65136, 65140, 65142, 65276, 65313, 65338, 65345, 65370, 65382, 65470, 65474, 65479, 65482, 65487, 65490, 65495, 65498, 65500,];
+    var unicodeES5IdentifierPart = [170, 170, 181, 181, 186, 186, 192, 214, 216, 246, 248, 705, 710, 721, 736, 740, 748, 748, 750, 750, 768, 884, 886, 887, 890, 893, 902, 902, 904, 906, 908, 908, 910, 929, 931, 1013, 1015, 1153, 1155, 1159, 1162, 1319, 1329, 1366, 1369, 1369, 1377, 1415, 1425, 1469, 1471, 1471, 1473, 1474, 1476, 1477, 1479, 1479, 1488, 1514, 1520, 1522, 1552, 1562, 1568, 1641, 1646, 1747, 1749, 1756, 1759, 1768, 1770, 1788, 1791, 1791, 1808, 1866, 1869, 1969, 1984, 2037, 2042, 2042, 2048, 2093, 2112, 2139, 2208, 2208, 2210, 2220, 2276, 2302, 2304, 2403, 2406, 2415, 2417, 2423, 2425, 2431, 2433, 2435, 2437, 2444, 2447, 2448, 2451, 2472, 2474, 2480, 2482, 2482, 2486, 2489, 2492, 2500, 2503, 2504, 2507, 2510, 2519, 2519, 2524, 2525, 2527, 2531, 2534, 2545, 2561, 2563, 2565, 2570, 2575, 2576, 2579, 2600, 2602, 2608, 2610, 2611, 2613, 2614, 2616, 2617, 2620, 2620, 2622, 2626, 2631, 2632, 2635, 2637, 2641, 2641, 2649, 2652, 2654, 2654, 2662, 2677, 2689, 2691, 2693, 2701, 2703, 2705, 2707, 2728, 2730, 2736, 2738, 2739, 2741, 2745, 2748, 2757, 2759, 2761, 2763, 2765, 2768, 2768, 2784, 2787, 2790, 2799, 2817, 2819, 2821, 2828, 2831, 2832, 2835, 2856, 2858, 2864, 2866, 2867, 2869, 2873, 2876, 2884, 2887, 2888, 2891, 2893, 2902, 2903, 2908, 2909, 2911, 2915, 2918, 2927, 2929, 2929, 2946, 2947, 2949, 2954, 2958, 2960, 2962, 2965, 2969, 2970, 2972, 2972, 2974, 2975, 2979, 2980, 2984, 2986, 2990, 3001, 3006, 3010, 3014, 3016, 3018, 3021, 3024, 3024, 3031, 3031, 3046, 3055, 3073, 3075, 3077, 3084, 3086, 3088, 3090, 3112, 3114, 3123, 3125, 3129, 3133, 3140, 3142, 3144, 3146, 3149, 3157, 3158, 3160, 3161, 3168, 3171, 3174, 3183, 3202, 3203, 3205, 3212, 3214, 3216, 3218, 3240, 3242, 3251, 3253, 3257, 3260, 3268, 3270, 3272, 3274, 3277, 3285, 3286, 3294, 3294, 3296, 3299, 3302, 3311, 3313, 3314, 3330, 3331, 3333, 3340, 3342, 3344, 3346, 3386, 3389, 3396, 3398, 3400, 3402, 3406, 3415, 3415, 3424, 3427, 3430, 3439, 3450, 3455, 3458, 3459, 3461, 3478, 3482, 3505, 3507, 3515, 3517, 3517, 3520, 3526, 3530, 3530, 3535, 3540, 3542, 3542, 3544, 3551, 3570, 3571, 3585, 3642, 3648, 3662, 3664, 3673, 3713, 3714, 3716, 3716, 3719, 3720, 3722, 3722, 3725, 3725, 3732, 3735, 3737, 3743, 3745, 3747, 3749, 3749, 3751, 3751, 3754, 3755, 3757, 3769, 3771, 3773, 3776, 3780, 3782, 3782, 3784, 3789, 3792, 3801, 3804, 3807, 3840, 3840, 3864, 3865, 3872, 3881, 3893, 3893, 3895, 3895, 3897, 3897, 3902, 3911, 3913, 3948, 3953, 3972, 3974, 3991, 3993, 4028, 4038, 4038, 4096, 4169, 4176, 4253, 4256, 4293, 4295, 4295, 4301, 4301, 4304, 4346, 4348, 4680, 4682, 4685, 4688, 4694, 4696, 4696, 4698, 4701, 4704, 4744, 4746, 4749, 4752, 4784, 4786, 4789, 4792, 4798, 4800, 4800, 4802, 4805, 4808, 4822, 4824, 4880, 4882, 4885, 4888, 4954, 4957, 4959, 4992, 5007, 5024, 5108, 5121, 5740, 5743, 5759, 5761, 5786, 5792, 5866, 5870, 5872, 5888, 5900, 5902, 5908, 5920, 5940, 5952, 5971, 5984, 5996, 5998, 6000, 6002, 6003, 6016, 6099, 6103, 6103, 6108, 6109, 6112, 6121, 6155, 6157, 6160, 6169, 6176, 6263, 6272, 6314, 6320, 6389, 6400, 6428, 6432, 6443, 6448, 6459, 6470, 6509, 6512, 6516, 6528, 6571, 6576, 6601, 6608, 6617, 6656, 6683, 6688, 6750, 6752, 6780, 6783, 6793, 6800, 6809, 6823, 6823, 6912, 6987, 6992, 7001, 7019, 7027, 7040, 7155, 7168, 7223, 7232, 7241, 7245, 7293, 7376, 7378, 7380, 7414, 7424, 7654, 7676, 7957, 7960, 7965, 7968, 8005, 8008, 8013, 8016, 8023, 8025, 8025, 8027, 8027, 8029, 8029, 8031, 8061, 8064, 8116, 8118, 8124, 8126, 8126, 8130, 8132, 8134, 8140, 8144, 8147, 8150, 8155, 8160, 8172, 8178, 8180, 8182, 8188, 8204, 8205, 8255, 8256, 8276, 8276, 8305, 8305, 8319, 8319, 8336, 8348, 8400, 8412, 8417, 8417, 8421, 8432, 8450, 8450, 8455, 8455, 8458, 8467, 8469, 8469, 8473, 8477, 8484, 8484, 8486, 8486, 8488, 8488, 8490, 8493, 8495, 8505, 8508, 8511, 8517, 8521, 8526, 8526, 8544, 8584, 11264, 11310, 11312, 11358, 11360, 11492, 11499, 11507, 11520, 11557, 11559, 11559, 11565, 11565, 11568, 11623, 11631, 11631, 11647, 11670, 11680, 11686, 11688, 11694, 11696, 11702, 11704, 11710, 11712, 11718, 11720, 11726, 11728, 11734, 11736, 11742, 11744, 11775, 11823, 11823, 12293, 12295, 12321, 12335, 12337, 12341, 12344, 12348, 12353, 12438, 12441, 12442, 12445, 12447, 12449, 12538, 12540, 12543, 12549, 12589, 12593, 12686, 12704, 12730, 12784, 12799, 13312, 19893, 19968, 40908, 40960, 42124, 42192, 42237, 42240, 42508, 42512, 42539, 42560, 42607, 42612, 42621, 42623, 42647, 42655, 42737, 42775, 42783, 42786, 42888, 42891, 42894, 42896, 42899, 42912, 42922, 43000, 43047, 43072, 43123, 43136, 43204, 43216, 43225, 43232, 43255, 43259, 43259, 43264, 43309, 43312, 43347, 43360, 43388, 43392, 43456, 43471, 43481, 43520, 43574, 43584, 43597, 43600, 43609, 43616, 43638, 43642, 43643, 43648, 43714, 43739, 43741, 43744, 43759, 43762, 43766, 43777, 43782, 43785, 43790, 43793, 43798, 43808, 43814, 43816, 43822, 43968, 44010, 44012, 44013, 44016, 44025, 44032, 55203, 55216, 55238, 55243, 55291, 63744, 64109, 64112, 64217, 64256, 64262, 64275, 64279, 64285, 64296, 64298, 64310, 64312, 64316, 64318, 64318, 64320, 64321, 64323, 64324, 64326, 64433, 64467, 64829, 64848, 64911, 64914, 64967, 65008, 65019, 65024, 65039, 65056, 65062, 65075, 65076, 65101, 65103, 65136, 65140, 65142, 65276, 65296, 65305, 65313, 65338, 65343, 65343, 65345, 65370, 65382, 65470, 65474, 65479, 65482, 65487, 65490, 65495, 65498, 65500,];
+    function lookupInUnicodeMap(code, map) {
+        // Bail out quickly if it couldn't possibly be in the map.
+        if (code < map[0]) {
+            return false;
+        }
+        // Perform binary search in one of the Unicode range maps
+        var lo = 0;
+        var hi = map.length;
+        var mid;
+        while (lo + 1 < hi) {
+            mid = lo + (hi - lo) / 2;
+            // mid has to be even to catch a range's beginning
+            mid -= mid % 2;
+            if (map[mid] <= code && code <= map[mid + 1]) {
+                return true;
+            }
+            if (code < map[mid]) {
+                hi = mid;
+            }
+            else {
+                lo = mid + 2;
+            }
+        }
+        return false;
+    }
+    /* @internal */ function isUnicodeIdentifierStart(code, languageVersion) {
+        return languageVersion >= 1 /* ES5 */ ?
+            lookupInUnicodeMap(code, unicodeES5IdentifierStart) :
+            lookupInUnicodeMap(code, unicodeES3IdentifierStart);
+    }
+    ts.isUnicodeIdentifierStart = isUnicodeIdentifierStart;
+    function isUnicodeIdentifierPart(code, languageVersion) {
+        return languageVersion >= 1 /* ES5 */ ?
+            lookupInUnicodeMap(code, unicodeES5IdentifierPart) :
+            lookupInUnicodeMap(code, unicodeES3IdentifierPart);
+    }
+    function makeReverseMap(source) {
+        var result = [];
+        source.forEach(function (value, name) {
+            result[value] = name;
+        });
+        return result;
+    }
+    var tokenStrings = makeReverseMap(textToToken);
+    function tokenToString(t) {
+        return tokenStrings[t];
+    }
+    ts.tokenToString = tokenToString;
+    /* @internal */
+    function stringToToken(s) {
+        return textToToken.get(s);
+    }
+    ts.stringToToken = stringToToken;
+    /* @internal */
+    function computeLineStarts(text) {
+        var result = new Array();
+        var pos = 0;
+        var lineStart = 0;
+        while (pos < text.length) {
+            var ch = text.charCodeAt(pos);
+            pos++;
+            switch (ch) {
+                case 13 /* carriageReturn */:
+                    if (text.charCodeAt(pos) === 10 /* lineFeed */) {
+                        pos++;
+                    }
+                // falls through
+                case 10 /* lineFeed */:
+                    result.push(lineStart);
+                    lineStart = pos;
+                    break;
+                default:
+                    if (ch > 127 /* maxAsciiCharacter */ && isLineBreak(ch)) {
+                        result.push(lineStart);
+                        lineStart = pos;
+                    }
+                    break;
+            }
+        }
+        result.push(lineStart);
+        return result;
+    }
+    ts.computeLineStarts = computeLineStarts;
+    function getPositionOfLineAndCharacter(sourceFile, line, character) {
+        return computePositionOfLineAndCharacter(getLineStarts(sourceFile), line, character, sourceFile.text);
+    }
+    ts.getPositionOfLineAndCharacter = getPositionOfLineAndCharacter;
+    /* @internal */
+    function computePositionOfLineAndCharacter(lineStarts, line, character, debugText) {
+        if (line < 0 || line >= lineStarts.length) {
+            ts.Debug.fail("Bad line number. Line: " + line + ", lineStarts.length: " + lineStarts.length + " , line map is correct? " + (debugText !== undefined ? ts.arraysEqual(lineStarts, computeLineStarts(debugText)) : "unknown"));
+        }
+        var res = lineStarts[line] + character;
+        if (line < lineStarts.length - 1) {
+            ts.Debug.assert(res < lineStarts[line + 1]);
+        }
+        else if (debugText !== undefined) {
+            ts.Debug.assert(res <= debugText.length); // Allow single character overflow for trailing newline
+        }
+        return res;
+    }
+    ts.computePositionOfLineAndCharacter = computePositionOfLineAndCharacter;
+    /* @internal */
+    function getLineStarts(sourceFile) {
+        return sourceFile.lineMap || (sourceFile.lineMap = computeLineStarts(sourceFile.text));
+    }
+    ts.getLineStarts = getLineStarts;
+    /* @internal */
+    /**
+     * We assume the first line starts at position 0 and 'position' is non-negative.
+     */
+    function computeLineAndCharacterOfPosition(lineStarts, position) {
+        var lineNumber = ts.binarySearch(lineStarts, position, ts.identity, ts.compareValues);
+        if (lineNumber < 0) {
+            // If the actual position was not found,
+            // the binary search returns the 2's-complement of the next line start
+            // e.g. if the line starts at [5, 10, 23, 80] and the position requested was 20
+            // then the search will return -2.
+            //
+            // We want the index of the previous line start, so we subtract 1.
+            // Review 2's-complement if this is confusing.
+            lineNumber = ~lineNumber - 1;
+            ts.Debug.assert(lineNumber !== -1, "position cannot precede the beginning of the file");
+        }
+        return {
+            line: lineNumber,
+            character: position - lineStarts[lineNumber]
+        };
+    }
+    ts.computeLineAndCharacterOfPosition = computeLineAndCharacterOfPosition;
+    function getLineAndCharacterOfPosition(sourceFile, position) {
+        return computeLineAndCharacterOfPosition(getLineStarts(sourceFile), position);
+    }
+    ts.getLineAndCharacterOfPosition = getLineAndCharacterOfPosition;
+    function isWhiteSpaceLike(ch) {
+        return isWhiteSpaceSingleLine(ch) || isLineBreak(ch);
+    }
+    ts.isWhiteSpaceLike = isWhiteSpaceLike;
+    /** Does not include line breaks. For that, see isWhiteSpaceLike. */
+    function isWhiteSpaceSingleLine(ch) {
+        // Note: nextLine is in the Zs space, and should be considered to be a whitespace.
+        // It is explicitly not a line-break as it isn't in the exact set specified by EcmaScript.
+        return ch === 32 /* space */ ||
+            ch === 9 /* tab */ ||
+            ch === 11 /* verticalTab */ ||
+            ch === 12 /* formFeed */ ||
+            ch === 160 /* nonBreakingSpace */ ||
+            ch === 133 /* nextLine */ ||
+            ch === 5760 /* ogham */ ||
+            ch >= 8192 /* enQuad */ && ch <= 8203 /* zeroWidthSpace */ ||
+            ch === 8239 /* narrowNoBreakSpace */ ||
+            ch === 8287 /* mathematicalSpace */ ||
+            ch === 12288 /* ideographicSpace */ ||
+            ch === 65279 /* byteOrderMark */;
+    }
+    ts.isWhiteSpaceSingleLine = isWhiteSpaceSingleLine;
+    function isLineBreak(ch) {
+        // ES5 7.3:
+        // The ECMAScript line terminator characters are listed in Table 3.
+        //     Table 3: Line Terminator Characters
+        //     Code Unit Value     Name                    Formal Name
+        //     \u000A              Line Feed               <LF>
+        //     \u000D              Carriage Return         <CR>
+        //     \u2028              Line separator          <LS>
+        //     \u2029              Paragraph separator     <PS>
+        // Only the characters in Table 3 are treated as line terminators. Other new line or line
+        // breaking characters are treated as white space but not as line terminators.
+        return ch === 10 /* lineFeed */ ||
+            ch === 13 /* carriageReturn */ ||
+            ch === 8232 /* lineSeparator */ ||
+            ch === 8233 /* paragraphSeparator */;
+    }
+    ts.isLineBreak = isLineBreak;
+    function isDigit(ch) {
+        return ch >= 48 /* _0 */ && ch <= 57 /* _9 */;
+    }
+    /* @internal */
+    function isOctalDigit(ch) {
+        return ch >= 48 /* _0 */ && ch <= 55 /* _7 */;
+    }
+    ts.isOctalDigit = isOctalDigit;
+    function couldStartTrivia(text, pos) {
+        // Keep in sync with skipTrivia
+        var ch = text.charCodeAt(pos);
+        switch (ch) {
+            case 13 /* carriageReturn */:
+            case 10 /* lineFeed */:
+            case 9 /* tab */:
+            case 11 /* verticalTab */:
+            case 12 /* formFeed */:
+            case 32 /* space */:
+            case 47 /* slash */:
+            // starts of normal trivia
+            case 60 /* lessThan */:
+            case 124 /* bar */:
+            case 61 /* equals */:
+            case 62 /* greaterThan */:
+                // Starts of conflict marker trivia
+                return true;
+            case 35 /* hash */:
+                // Only if its the beginning can we have #! trivia
+                return pos === 0;
+            default:
+                return ch > 127 /* maxAsciiCharacter */;
+        }
+    }
+    ts.couldStartTrivia = couldStartTrivia;
+    /* @internal */
+    function skipTrivia(text, pos, stopAfterLineBreak, stopAtComments) {
+        if (stopAtComments === void 0) { stopAtComments = false; }
+        if (ts.positionIsSynthesized(pos)) {
+            return pos;
+        }
+        // Keep in sync with couldStartTrivia
+        while (true) {
+            var ch = text.charCodeAt(pos);
+            switch (ch) {
+                case 13 /* carriageReturn */:
+                    if (text.charCodeAt(pos + 1) === 10 /* lineFeed */) {
+                        pos++;
+                    }
+                // falls through
+                case 10 /* lineFeed */:
+                    pos++;
+                    if (stopAfterLineBreak) {
+                        return pos;
+                    }
+                    continue;
+                case 9 /* tab */:
+                case 11 /* verticalTab */:
+                case 12 /* formFeed */:
+                case 32 /* space */:
+                    pos++;
+                    continue;
+                case 47 /* slash */:
+                    if (stopAtComments) {
+                        break;
+                    }
+                    if (text.charCodeAt(pos + 1) === 47 /* slash */) {
+                        pos += 2;
+                        while (pos < text.length) {
+                            if (isLineBreak(text.charCodeAt(pos))) {
+                                break;
+                            }
+                            pos++;
+                        }
+                        continue;
+                    }
+                    if (text.charCodeAt(pos + 1) === 42 /* asterisk */) {
+                        pos += 2;
+                        while (pos < text.length) {
+                            if (text.charCodeAt(pos) === 42 /* asterisk */ && text.charCodeAt(pos + 1) === 47 /* slash */) {
+                                pos += 2;
+                                break;
+                            }
+                            pos++;
+                        }
+                        continue;
+                    }
+                    break;
+                case 60 /* lessThan */:
+                case 124 /* bar */:
+                case 61 /* equals */:
+                case 62 /* greaterThan */:
+                    if (isConflictMarkerTrivia(text, pos)) {
+                        pos = scanConflictMarkerTrivia(text, pos);
+                        continue;
+                    }
+                    break;
+                case 35 /* hash */:
+                    if (pos === 0 && isShebangTrivia(text, pos)) {
+                        pos = scanShebangTrivia(text, pos);
+                        continue;
+                    }
+                    break;
+                default:
+                    if (ch > 127 /* maxAsciiCharacter */ && (isWhiteSpaceLike(ch))) {
+                        pos++;
+                        continue;
+                    }
+                    break;
+            }
+            return pos;
+        }
+    }
+    ts.skipTrivia = skipTrivia;
+    // All conflict markers consist of the same character repeated seven times.  If it is
+    // a <<<<<<< or >>>>>>> marker then it is also followed by a space.
+    var mergeConflictMarkerLength = "<<<<<<<".length;
+    function isConflictMarkerTrivia(text, pos) {
+        ts.Debug.assert(pos >= 0);
+        // Conflict markers must be at the start of a line.
+        if (pos === 0 || isLineBreak(text.charCodeAt(pos - 1))) {
+            var ch = text.charCodeAt(pos);
+            if ((pos + mergeConflictMarkerLength) < text.length) {
+                for (var i = 0; i < mergeConflictMarkerLength; i++) {
+                    if (text.charCodeAt(pos + i) !== ch) {
+                        return false;
+                    }
+                }
+                return ch === 61 /* equals */ ||
+                    text.charCodeAt(pos + mergeConflictMarkerLength) === 32 /* space */;
+            }
+        }
+        return false;
+    }
+    function scanConflictMarkerTrivia(text, pos, error) {
+        if (error) {
+            error(ts.Diagnostics.Merge_conflict_marker_encountered, pos, mergeConflictMarkerLength);
+        }
+        var ch = text.charCodeAt(pos);
+        var len = text.length;
+        if (ch === 60 /* lessThan */ || ch === 62 /* greaterThan */) {
+            while (pos < len && !isLineBreak(text.charCodeAt(pos))) {
+                pos++;
+            }
+        }
+        else {
+            ts.Debug.assert(ch === 124 /* bar */ || ch === 61 /* equals */);
+            // Consume everything from the start of a ||||||| or ======= marker to the start
+            // of the next ======= or >>>>>>> marker.
+            while (pos < len) {
+                var currentChar = text.charCodeAt(pos);
+                if ((currentChar === 61 /* equals */ || currentChar === 62 /* greaterThan */) && currentChar !== ch && isConflictMarkerTrivia(text, pos)) {
+                    break;
+                }
+                pos++;
+            }
+        }
+        return pos;
+    }
+    var shebangTriviaRegex = /^#!.*/;
+    function isShebangTrivia(text, pos) {
+        // Shebangs check must only be done at the start of the file
+        ts.Debug.assert(pos === 0);
+        return shebangTriviaRegex.test(text);
+    }
+    function scanShebangTrivia(text, pos) {
+        var shebang = shebangTriviaRegex.exec(text)[0];
+        pos = pos + shebang.length;
+        return pos;
+    }
+    /**
+     * Invokes a callback for each comment range following the provided position.
+     *
+     * Single-line comment ranges include the leading double-slash characters but not the ending
+     * line break. Multi-line comment ranges include the leading slash-asterisk and trailing
+     * asterisk-slash characters.
+     *
+     * @param reduce If true, accumulates the result of calling the callback in a fashion similar
+     *      to reduceLeft. If false, iteration stops when the callback returns a truthy value.
+     * @param text The source text to scan.
+     * @param pos The position at which to start scanning.
+     * @param trailing If false, whitespace is skipped until the first line break and comments
+     *      between that location and the next token are returned. If true, comments occurring
+     *      between the given position and the next line break are returned.
+     * @param cb The callback to execute as each comment range is encountered.
+     * @param state A state value to pass to each iteration of the callback.
+     * @param initial An initial value to pass when accumulating results (when "reduce" is true).
+     * @returns If "reduce" is true, the accumulated value. If "reduce" is false, the first truthy
+     *      return value of the callback.
+     */
+    function iterateCommentRanges(reduce, text, pos, trailing, cb, state, initial) {
+        var pendingPos;
+        var pendingEnd;
+        var pendingKind;
+        var pendingHasTrailingNewLine;
+        var hasPendingCommentRange = false;
+        var collecting = trailing || pos === 0;
+        var accumulator = initial;
+        scan: while (pos >= 0 && pos < text.length) {
+            var ch = text.charCodeAt(pos);
+            switch (ch) {
+                case 13 /* carriageReturn */:
+                    if (text.charCodeAt(pos + 1) === 10 /* lineFeed */) {
+                        pos++;
+                    }
+                // falls through
+                case 10 /* lineFeed */:
+                    pos++;
+                    if (trailing) {
+                        break scan;
+                    }
+                    collecting = true;
+                    if (hasPendingCommentRange) {
+                        pendingHasTrailingNewLine = true;
+                    }
+                    continue;
+                case 9 /* tab */:
+                case 11 /* verticalTab */:
+                case 12 /* formFeed */:
+                case 32 /* space */:
+                    pos++;
+                    continue;
+                case 47 /* slash */:
+                    var nextChar = text.charCodeAt(pos + 1);
+                    var hasTrailingNewLine = false;
+                    if (nextChar === 47 /* slash */ || nextChar === 42 /* asterisk */) {
+                        var kind = nextChar === 47 /* slash */ ? 2 /* SingleLineCommentTrivia */ : 3 /* MultiLineCommentTrivia */;
+                        var startPos = pos;
+                        pos += 2;
+                        if (nextChar === 47 /* slash */) {
+                            while (pos < text.length) {
+                                if (isLineBreak(text.charCodeAt(pos))) {
+                                    hasTrailingNewLine = true;
+                                    break;
+                                }
+                                pos++;
+                            }
+                        }
+                        else {
+                            while (pos < text.length) {
+                                if (text.charCodeAt(pos) === 42 /* asterisk */ && text.charCodeAt(pos + 1) === 47 /* slash */) {
+                                    pos += 2;
+                                    break;
+                                }
+                                pos++;
+                            }
+                        }
+                        if (collecting) {
+                            if (hasPendingCommentRange) {
+                                accumulator = cb(pendingPos, pendingEnd, pendingKind, pendingHasTrailingNewLine, state, accumulator);
+                                if (!reduce && accumulator) {
+                                    // If we are not reducing and we have a truthy result, return it.
+                                    return accumulator;
+                                }
+                            }
+                            pendingPos = startPos;
+                            pendingEnd = pos;
+                            pendingKind = kind;
+                            pendingHasTrailingNewLine = hasTrailingNewLine;
+                            hasPendingCommentRange = true;
+                        }
+                        continue;
+                    }
+                    break scan;
+                default:
+                    if (ch > 127 /* maxAsciiCharacter */ && (isWhiteSpaceLike(ch))) {
+                        if (hasPendingCommentRange && isLineBreak(ch)) {
+                            pendingHasTrailingNewLine = true;
+                        }
+                        pos++;
+                        continue;
+                    }
+                    break scan;
+            }
+        }
+        if (hasPendingCommentRange) {
+            accumulator = cb(pendingPos, pendingEnd, pendingKind, pendingHasTrailingNewLine, state, accumulator);
+        }
+        return accumulator;
+    }
+    function forEachLeadingCommentRange(text, pos, cb, state) {
+        return iterateCommentRanges(/*reduce*/ false, text, pos, /*trailing*/ false, cb, state);
+    }
+    ts.forEachLeadingCommentRange = forEachLeadingCommentRange;
+    function forEachTrailingCommentRange(text, pos, cb, state) {
+        return iterateCommentRanges(/*reduce*/ false, text, pos, /*trailing*/ true, cb, state);
+    }
+    ts.forEachTrailingCommentRange = forEachTrailingCommentRange;
+    function reduceEachLeadingCommentRange(text, pos, cb, state, initial) {
+        return iterateCommentRanges(/*reduce*/ true, text, pos, /*trailing*/ false, cb, state, initial);
+    }
+    ts.reduceEachLeadingCommentRange = reduceEachLeadingCommentRange;
+    function reduceEachTrailingCommentRange(text, pos, cb, state, initial) {
+        return iterateCommentRanges(/*reduce*/ true, text, pos, /*trailing*/ true, cb, state, initial);
+    }
+    ts.reduceEachTrailingCommentRange = reduceEachTrailingCommentRange;
+    function appendCommentRange(pos, end, kind, hasTrailingNewLine, _state, comments) {
+        if (!comments) {
+            comments = [];
+        }
+        comments.push({ kind: kind, pos: pos, end: end, hasTrailingNewLine: hasTrailingNewLine });
+        return comments;
+    }
+    function getLeadingCommentRanges(text, pos) {
+        return reduceEachLeadingCommentRange(text, pos, appendCommentRange, /*state*/ undefined, /*initial*/ undefined);
+    }
+    ts.getLeadingCommentRanges = getLeadingCommentRanges;
+    function getTrailingCommentRanges(text, pos) {
+        return reduceEachTrailingCommentRange(text, pos, appendCommentRange, /*state*/ undefined, /*initial*/ undefined);
+    }
+    ts.getTrailingCommentRanges = getTrailingCommentRanges;
+    /** Optionally, get the shebang */
+    function getShebang(text) {
+        var match = shebangTriviaRegex.exec(text);
+        if (match) {
+            return match[0];
+        }
+    }
+    ts.getShebang = getShebang;
+    function isIdentifierStart(ch, languageVersion) {
+        return ch >= 65 /* A */ && ch <= 90 /* Z */ || ch >= 97 /* a */ && ch <= 122 /* z */ ||
+            ch === 36 /* $ */ || ch === 95 /* _ */ ||
+            ch > 127 /* maxAsciiCharacter */ && isUnicodeIdentifierStart(ch, languageVersion);
+    }
+    ts.isIdentifierStart = isIdentifierStart;
+    function isIdentifierPart(ch, languageVersion) {
+        return ch >= 65 /* A */ && ch <= 90 /* Z */ || ch >= 97 /* a */ && ch <= 122 /* z */ ||
+            ch >= 48 /* _0 */ && ch <= 57 /* _9 */ || ch === 36 /* $ */ || ch === 95 /* _ */ ||
+            ch > 127 /* maxAsciiCharacter */ && isUnicodeIdentifierPart(ch, languageVersion);
+    }
+    ts.isIdentifierPart = isIdentifierPart;
+    /* @internal */
+    function isIdentifierText(name, languageVersion) {
+        if (!isIdentifierStart(name.charCodeAt(0), languageVersion)) {
+            return false;
+        }
+        for (var i = 1; i < name.length; i++) {
+            if (!isIdentifierPart(name.charCodeAt(i), languageVersion)) {
+                return false;
+            }
+        }
+        return true;
+    }
+    ts.isIdentifierText = isIdentifierText;
+    // Creates a scanner over a (possibly unspecified) range of a piece of text.
+    function createScanner(languageVersion, skipTrivia, languageVariant, textInitial, onError, start, length) {
+        if (languageVariant === void 0) { languageVariant = 0 /* Standard */; }
+        var text = textInitial;
+        // Current position (end position of text of current token)
+        var pos;
+        // end of text
+        var end;
+        // Start position of whitespace before current token
+        var startPos;
+        // Start position of text of current token
+        var tokenPos;
+        var token;
+        var tokenValue;
+        var tokenFlags;
+        setText(text, start, length);
+        return {
+            getStartPos: function () { return startPos; },
+            getTextPos: function () { return pos; },
+            getToken: function () { return token; },
+            getTokenPos: function () { return tokenPos; },
+            getTokenText: function () { return text.substring(tokenPos, pos); },
+            getTokenValue: function () { return tokenValue; },
+            hasExtendedUnicodeEscape: function () { return (tokenFlags & 8 /* ExtendedUnicodeEscape */) !== 0; },
+            hasPrecedingLineBreak: function () { return (tokenFlags & 1 /* PrecedingLineBreak */) !== 0; },
+            isIdentifier: function () { return token === 71 /* Identifier */ || token > 107 /* LastReservedWord */; },
+            isReservedWord: function () { return token >= 72 /* FirstReservedWord */ && token <= 107 /* LastReservedWord */; },
+            isUnterminated: function () { return (tokenFlags & 4 /* Unterminated */) !== 0; },
+            getTokenFlags: function () { return tokenFlags; },
+            reScanGreaterToken: reScanGreaterToken,
+            reScanSlashToken: reScanSlashToken,
+            reScanTemplateToken: reScanTemplateToken,
+            scanJsxIdentifier: scanJsxIdentifier,
+            scanJsxAttributeValue: scanJsxAttributeValue,
+            reScanJsxToken: reScanJsxToken,
+            scanJsxToken: scanJsxToken,
+            scanJSDocToken: scanJSDocToken,
+            scan: scan,
+            getText: getText,
+            setText: setText,
+            setScriptTarget: setScriptTarget,
+            setLanguageVariant: setLanguageVariant,
+            setOnError: setOnError,
+            setTextPos: setTextPos,
+            tryScan: tryScan,
+            lookAhead: lookAhead,
+            scanRange: scanRange,
+        };
+        function error(message, errPos, length) {
+            if (errPos === void 0) { errPos = pos; }
+            if (onError) {
+                var oldPos = pos;
+                pos = errPos;
+                onError(message, length || 0);
+                pos = oldPos;
+            }
+        }
+        function scanNumberFragment() {
+            var start = pos;
+            var allowSeparator = false;
+            var isPreviousTokenSeparator = false;
+            var result = "";
+            while (true) {
+                var ch = text.charCodeAt(pos);
+                if (ch === 95 /* _ */) {
+                    tokenFlags |= 512 /* ContainsSeparator */;
+                    if (allowSeparator) {
+                        allowSeparator = false;
+                        isPreviousTokenSeparator = true;
+                        result += text.substring(start, pos);
+                    }
+                    else if (isPreviousTokenSeparator) {
+                        error(ts.Diagnostics.Multiple_consecutive_numeric_separators_are_not_permitted, pos, 1);
+                    }
+                    else {
+                        error(ts.Diagnostics.Numeric_separators_are_not_allowed_here, pos, 1);
+                    }
+                    pos++;
+                    start = pos;
+                    continue;
+                }
+                if (isDigit(ch)) {
+                    allowSeparator = true;
+                    isPreviousTokenSeparator = false;
+                    pos++;
+                    continue;
+                }
+                break;
+            }
+            if (text.charCodeAt(pos - 1) === 95 /* _ */) {
+                error(ts.Diagnostics.Numeric_separators_are_not_allowed_here, pos - 1, 1);
+            }
+            return result + text.substring(start, pos);
+        }
+        function scanNumber() {
+            var start = pos;
+            var mainFragment = scanNumberFragment();
+            var decimalFragment;
+            var scientificFragment;
+            if (text.charCodeAt(pos) === 46 /* dot */) {
+                pos++;
+                decimalFragment = scanNumberFragment();
+            }
+            var end = pos;
+            if (text.charCodeAt(pos) === 69 /* E */ || text.charCodeAt(pos) === 101 /* e */) {
+                pos++;
+                tokenFlags |= 16 /* Scientific */;
+                if (text.charCodeAt(pos) === 43 /* plus */ || text.charCodeAt(pos) === 45 /* minus */)
+                    pos++;
+                var preNumericPart = pos;
+                var finalFragment = scanNumberFragment();
+                if (!finalFragment) {
+                    error(ts.Diagnostics.Digit_expected);
+                }
+                else {
+                    scientificFragment = text.substring(end, preNumericPart) + finalFragment;
+                    end = pos;
+                }
+            }
+            if (tokenFlags & 512 /* ContainsSeparator */) {
+                var result = mainFragment;
+                if (decimalFragment) {
+                    result += "." + decimalFragment;
+                }
+                if (scientificFragment) {
+                    result += scientificFragment;
+                }
+                return "" + +result;
+            }
+            else {
+                return "" + +(text.substring(start, end)); // No need to use all the fragments; no _ removal needed
+            }
+        }
+        function scanOctalDigits() {
+            var start = pos;
+            while (isOctalDigit(text.charCodeAt(pos))) {
+                pos++;
+            }
+            return +(text.substring(start, pos));
+        }
+        /**
+         * Scans the given number of hexadecimal digits in the text,
+         * returning -1 if the given number is unavailable.
+         */
+        function scanExactNumberOfHexDigits(count, canHaveSeparators) {
+            return scanHexDigits(/*minCount*/ count, /*scanAsManyAsPossible*/ false, canHaveSeparators);
+        }
+        /**
+         * Scans as many hexadecimal digits as are available in the text,
+         * returning -1 if the given number of digits was unavailable.
+         */
+        function scanMinimumNumberOfHexDigits(count, canHaveSeparators) {
+            return scanHexDigits(/*minCount*/ count, /*scanAsManyAsPossible*/ true, canHaveSeparators);
+        }
+        function scanHexDigits(minCount, scanAsManyAsPossible, canHaveSeparators) {
+            var digits = 0;
+            var value = 0;
+            var allowSeparator = false;
+            var isPreviousTokenSeparator = false;
+            while (digits < minCount || scanAsManyAsPossible) {
+                var ch = text.charCodeAt(pos);
+                if (canHaveSeparators && ch === 95 /* _ */) {
+                    tokenFlags |= 512 /* ContainsSeparator */;
+                    if (allowSeparator) {
+                        allowSeparator = false;
+                        isPreviousTokenSeparator = true;
+                    }
+                    else if (isPreviousTokenSeparator) {
+                        error(ts.Diagnostics.Multiple_consecutive_numeric_separators_are_not_permitted, pos, 1);
+                    }
+                    else {
+                        error(ts.Diagnostics.Numeric_separators_are_not_allowed_here, pos, 1);
+                    }
+                    pos++;
+                    continue;
+                }
+                allowSeparator = canHaveSeparators;
+                if (ch >= 48 /* _0 */ && ch <= 57 /* _9 */) {
+                    value = value * 16 + ch - 48 /* _0 */;
+                }
+                else if (ch >= 65 /* A */ && ch <= 70 /* F */) {
+                    value = value * 16 + ch - 65 /* A */ + 10;
+                }
+                else if (ch >= 97 /* a */ && ch <= 102 /* f */) {
+                    value = value * 16 + ch - 97 /* a */ + 10;
+                }
+                else {
+                    break;
+                }
+                pos++;
+                digits++;
+                isPreviousTokenSeparator = false;
+            }
+            if (digits < minCount) {
+                value = -1;
+            }
+            if (text.charCodeAt(pos - 1) === 95 /* _ */) {
+                error(ts.Diagnostics.Numeric_separators_are_not_allowed_here, pos - 1, 1);
+            }
+            return value;
+        }
+        function scanString(jsxAttributeString) {
+            if (jsxAttributeString === void 0) { jsxAttributeString = false; }
+            var quote = text.charCodeAt(pos);
+            pos++;
+            var result = "";
+            var start = pos;
+            while (true) {
+                if (pos >= end) {
+                    result += text.substring(start, pos);
+                    tokenFlags |= 4 /* Unterminated */;
+                    error(ts.Diagnostics.Unterminated_string_literal);
+                    break;
+                }
+                var ch = text.charCodeAt(pos);
+                if (ch === quote) {
+                    result += text.substring(start, pos);
+                    pos++;
+                    break;
+                }
+                if (ch === 92 /* backslash */ && !jsxAttributeString) {
+                    result += text.substring(start, pos);
+                    result += scanEscapeSequence();
+                    start = pos;
+                    continue;
+                }
+                if (isLineBreak(ch) && !jsxAttributeString) {
+                    result += text.substring(start, pos);
+                    tokenFlags |= 4 /* Unterminated */;
+                    error(ts.Diagnostics.Unterminated_string_literal);
+                    break;
+                }
+                pos++;
+            }
+            return result;
+        }
+        /**
+         * Sets the current 'tokenValue' and returns a NoSubstitutionTemplateLiteral or
+         * a literal component of a TemplateExpression.
+         */
+        function scanTemplateAndSetTokenValue() {
+            var startedWithBacktick = text.charCodeAt(pos) === 96 /* backtick */;
+            pos++;
+            var start = pos;
+            var contents = "";
+            var resultingToken;
+            while (true) {
+                if (pos >= end) {
+                    contents += text.substring(start, pos);
+                    tokenFlags |= 4 /* Unterminated */;
+                    error(ts.Diagnostics.Unterminated_template_literal);
+                    resultingToken = startedWithBacktick ? 13 /* NoSubstitutionTemplateLiteral */ : 16 /* TemplateTail */;
+                    break;
+                }
+                var currChar = text.charCodeAt(pos);
+                // '`'
+                if (currChar === 96 /* backtick */) {
+                    contents += text.substring(start, pos);
+                    pos++;
+                    resultingToken = startedWithBacktick ? 13 /* NoSubstitutionTemplateLiteral */ : 16 /* TemplateTail */;
+                    break;
+                }
+                // '${'
+                if (currChar === 36 /* $ */ && pos + 1 < end && text.charCodeAt(pos + 1) === 123 /* openBrace */) {
+                    contents += text.substring(start, pos);
+                    pos += 2;
+                    resultingToken = startedWithBacktick ? 14 /* TemplateHead */ : 15 /* TemplateMiddle */;
+                    break;
+                }
+                // Escape character
+                if (currChar === 92 /* backslash */) {
+                    contents += text.substring(start, pos);
+                    contents += scanEscapeSequence();
+                    start = pos;
+                    continue;
+                }
+                // Speculated ECMAScript 6 Spec 11.8.6.1:
+                // <CR><LF> and <CR> LineTerminatorSequences are normalized to <LF> for Template Values
+                if (currChar === 13 /* carriageReturn */) {
+                    contents += text.substring(start, pos);
+                    pos++;
+                    if (pos < end && text.charCodeAt(pos) === 10 /* lineFeed */) {
+                        pos++;
+                    }
+                    contents += "\n";
+                    start = pos;
+                    continue;
+                }
+                pos++;
+            }
+            ts.Debug.assert(resultingToken !== undefined);
+            tokenValue = contents;
+            return resultingToken;
+        }
+        function scanEscapeSequence() {
+            pos++;
+            if (pos >= end) {
+                error(ts.Diagnostics.Unexpected_end_of_text);
+                return "";
+            }
+            var ch = text.charCodeAt(pos);
+            pos++;
+            switch (ch) {
+                case 48 /* _0 */:
+                    return "\0";
+                case 98 /* b */:
+                    return "\b";
+                case 116 /* t */:
+                    return "\t";
+                case 110 /* n */:
+                    return "\n";
+                case 118 /* v */:
+                    return "\v";
+                case 102 /* f */:
+                    return "\f";
+                case 114 /* r */:
+                    return "\r";
+                case 39 /* singleQuote */:
+                    return "\'";
+                case 34 /* doubleQuote */:
+                    return "\"";
+                case 117 /* u */:
+                    // '\u{DDDDDDDD}'
+                    if (pos < end && text.charCodeAt(pos) === 123 /* openBrace */) {
+                        tokenFlags |= 8 /* ExtendedUnicodeEscape */;
+                        pos++;
+                        return scanExtendedUnicodeEscape();
+                    }
+                    // '\uDDDD'
+                    return scanHexadecimalEscape(/*numDigits*/ 4);
+                case 120 /* x */:
+                    // '\xDD'
+                    return scanHexadecimalEscape(/*numDigits*/ 2);
+                // when encountering a LineContinuation (i.e. a backslash and a line terminator sequence),
+                // the line terminator is interpreted to be "the empty code unit sequence".
+                case 13 /* carriageReturn */:
+                    if (pos < end && text.charCodeAt(pos) === 10 /* lineFeed */) {
+                        pos++;
+                    }
+                // falls through
+                case 10 /* lineFeed */:
+                case 8232 /* lineSeparator */:
+                case 8233 /* paragraphSeparator */:
+                    return "";
+                default:
+                    return String.fromCharCode(ch);
+            }
+        }
+        function scanHexadecimalEscape(numDigits) {
+            var escapedValue = scanExactNumberOfHexDigits(numDigits, /*canHaveSeparators*/ false);
+            if (escapedValue >= 0) {
+                return String.fromCharCode(escapedValue);
+            }
+            else {
+                error(ts.Diagnostics.Hexadecimal_digit_expected);
+                return "";
+            }
+        }
+        function scanExtendedUnicodeEscape() {
+            var escapedValue = scanMinimumNumberOfHexDigits(1, /*canHaveSeparators*/ false);
+            var isInvalidExtendedEscape = false;
+            // Validate the value of the digit
+            if (escapedValue < 0) {
+                error(ts.Diagnostics.Hexadecimal_digit_expected);
+                isInvalidExtendedEscape = true;
+            }
+            else if (escapedValue > 0x10FFFF) {
+                error(ts.Diagnostics.An_extended_Unicode_escape_value_must_be_between_0x0_and_0x10FFFF_inclusive);
+                isInvalidExtendedEscape = true;
+            }
+            if (pos >= end) {
+                error(ts.Diagnostics.Unexpected_end_of_text);
+                isInvalidExtendedEscape = true;
+            }
+            else if (text.charCodeAt(pos) === 125 /* closeBrace */) {
+                // Only swallow the following character up if it's a '}'.
+                pos++;
+            }
+            else {
+                error(ts.Diagnostics.Unterminated_Unicode_escape_sequence);
+                isInvalidExtendedEscape = true;
+            }
+            if (isInvalidExtendedEscape) {
+                return "";
+            }
+            return utf16EncodeAsString(escapedValue);
+        }
+        // Derived from the 10.1.1 UTF16Encoding of the ES6 Spec.
+        function utf16EncodeAsString(codePoint) {
+            ts.Debug.assert(0x0 <= codePoint && codePoint <= 0x10FFFF);
+            if (codePoint <= 65535) {
+                return String.fromCharCode(codePoint);
+            }
+            var codeUnit1 = Math.floor((codePoint - 65536) / 1024) + 0xD800;
+            var codeUnit2 = ((codePoint - 65536) % 1024) + 0xDC00;
+            return String.fromCharCode(codeUnit1, codeUnit2);
+        }
+        // Current character is known to be a backslash. Check for Unicode escape of the form '\uXXXX'
+        // and return code point value if valid Unicode escape is found. Otherwise return -1.
+        function peekUnicodeEscape() {
+            if (pos + 5 < end && text.charCodeAt(pos + 1) === 117 /* u */) {
+                var start_1 = pos;
+                pos += 2;
+                var value = scanExactNumberOfHexDigits(4, /*canHaveSeparators*/ false);
+                pos = start_1;
+                return value;
+            }
+            return -1;
+        }
+        function scanIdentifierParts() {
+            var result = "";
+            var start = pos;
+            while (pos < end) {
+                var ch = text.charCodeAt(pos);
+                if (isIdentifierPart(ch, languageVersion)) {
+                    pos++;
+                }
+                else if (ch === 92 /* backslash */) {
+                    ch = peekUnicodeEscape();
+                    if (!(ch >= 0 && isIdentifierPart(ch, languageVersion))) {
+                        break;
+                    }
+                    result += text.substring(start, pos);
+                    result += String.fromCharCode(ch);
+                    // Valid Unicode escape is always six characters
+                    pos += 6;
+                    start = pos;
+                }
+                else {
+                    break;
+                }
+            }
+            result += text.substring(start, pos);
+            return result;
+        }
+        function getIdentifierToken() {
+            // Reserved words are between 2 and 11 characters long and start with a lowercase letter
+            var len = tokenValue.length;
+            if (len >= 2 && len <= 11) {
+                var ch = tokenValue.charCodeAt(0);
+                if (ch >= 97 /* a */ && ch <= 122 /* z */) {
+                    token = textToToken.get(tokenValue);
+                    if (token !== undefined) {
+                        return token;
+                    }
+                }
+            }
+            return token = 71 /* Identifier */;
+        }
+        function scanBinaryOrOctalDigits(base) {
+            ts.Debug.assert(base === 2 || base === 8, "Expected either base 2 or base 8");
+            var value = 0;
+            // For counting number of digits; Valid binaryIntegerLiteral must have at least one binary digit following B or b.
+            // Similarly valid octalIntegerLiteral must have at least one octal digit following o or O.
+            var numberOfDigits = 0;
+            var separatorAllowed = false;
+            var isPreviousTokenSeparator = false;
+            while (true) {
+                var ch = text.charCodeAt(pos);
+                // Numeric separators are allowed anywhere within a numeric literal, except not at the beginning, or following another separator
+                if (ch === 95 /* _ */) {
+                    tokenFlags |= 512 /* ContainsSeparator */;
+                    if (separatorAllowed) {
+                        separatorAllowed = false;
+                        isPreviousTokenSeparator = true;
+                    }
+                    else if (isPreviousTokenSeparator) {
+                        error(ts.Diagnostics.Multiple_consecutive_numeric_separators_are_not_permitted, pos, 1);
+                    }
+                    else {
+                        error(ts.Diagnostics.Numeric_separators_are_not_allowed_here, pos, 1);
+                    }
+                    pos++;
+                    continue;
+                }
+                separatorAllowed = true;
+                var valueOfCh = ch - 48 /* _0 */;
+                if (!isDigit(ch) || valueOfCh >= base) {
+                    break;
+                }
+                value = value * base + valueOfCh;
+                pos++;
+                numberOfDigits++;
+                isPreviousTokenSeparator = false;
+            }
+            // Invalid binaryIntegerLiteral or octalIntegerLiteral
+            if (numberOfDigits === 0) {
+                return -1;
+            }
+            if (text.charCodeAt(pos - 1) === 95 /* _ */) {
+                // Literal ends with underscore - not allowed
+                error(ts.Diagnostics.Numeric_separators_are_not_allowed_here, pos - 1, 1);
+                return value;
+            }
+            return value;
+        }
+        function scan() {
+            startPos = pos;
+            tokenFlags = 0;
+            while (true) {
+                tokenPos = pos;
+                if (pos >= end) {
+                    return token = 1 /* EndOfFileToken */;
+                }
+                var ch = text.charCodeAt(pos);
+                // Special handling for shebang
+                if (ch === 35 /* hash */ && pos === 0 && isShebangTrivia(text, pos)) {
+                    pos = scanShebangTrivia(text, pos);
+                    if (skipTrivia) {
+                        continue;
+                    }
+                    else {
+                        return token = 6 /* ShebangTrivia */;
+                    }
+                }
+                switch (ch) {
+                    case 10 /* lineFeed */:
+                    case 13 /* carriageReturn */:
+                        tokenFlags |= 1 /* PrecedingLineBreak */;
+                        if (skipTrivia) {
+                            pos++;
+                            continue;
+                        }
+                        else {
+                            if (ch === 13 /* carriageReturn */ && pos + 1 < end && text.charCodeAt(pos + 1) === 10 /* lineFeed */) {
+                                // consume both CR and LF
+                                pos += 2;
+                            }
+                            else {
+                                pos++;
+                            }
+                            return token = 4 /* NewLineTrivia */;
+                        }
+                    case 9 /* tab */:
+                    case 11 /* verticalTab */:
+                    case 12 /* formFeed */:
+                    case 32 /* space */:
+                        if (skipTrivia) {
+                            pos++;
+                            continue;
+                        }
+                        else {
+                            while (pos < end && isWhiteSpaceSingleLine(text.charCodeAt(pos))) {
+                                pos++;
+                            }
+                            return token = 5 /* WhitespaceTrivia */;
+                        }
+                    case 33 /* exclamation */:
+                        if (text.charCodeAt(pos + 1) === 61 /* equals */) {
+                            if (text.charCodeAt(pos + 2) === 61 /* equals */) {
+                                return pos += 3, token = 35 /* ExclamationEqualsEqualsToken */;
+                            }
+                            return pos += 2, token = 33 /* ExclamationEqualsToken */;
+                        }
+                        pos++;
+                        return token = 51 /* ExclamationToken */;
+                    case 34 /* doubleQuote */:
+                    case 39 /* singleQuote */:
+                        tokenValue = scanString();
+                        return token = 9 /* StringLiteral */;
+                    case 96 /* backtick */:
+                        return token = scanTemplateAndSetTokenValue();
+                    case 37 /* percent */:
+                        if (text.charCodeAt(pos + 1) === 61 /* equals */) {
+                            return pos += 2, token = 64 /* PercentEqualsToken */;
+                        }
+                        pos++;
+                        return token = 42 /* PercentToken */;
+                    case 38 /* ampersand */:
+                        if (text.charCodeAt(pos + 1) === 38 /* ampersand */) {
+                            return pos += 2, token = 53 /* AmpersandAmpersandToken */;
+                        }
+                        if (text.charCodeAt(pos + 1) === 61 /* equals */) {
+                            return pos += 2, token = 68 /* AmpersandEqualsToken */;
+                        }
+                        pos++;
+                        return token = 48 /* AmpersandToken */;
+                    case 40 /* openParen */:
+                        pos++;
+                        return token = 19 /* OpenParenToken */;
+                    case 41 /* closeParen */:
+                        pos++;
+                        return token = 20 /* CloseParenToken */;
+                    case 42 /* asterisk */:
+                        if (text.charCodeAt(pos + 1) === 61 /* equals */) {
+                            return pos += 2, token = 61 /* AsteriskEqualsToken */;
+                        }
+                        if (text.charCodeAt(pos + 1) === 42 /* asterisk */) {
+                            if (text.charCodeAt(pos + 2) === 61 /* equals */) {
+                                return pos += 3, token = 62 /* AsteriskAsteriskEqualsToken */;
+                            }
+                            return pos += 2, token = 40 /* AsteriskAsteriskToken */;
+                        }
+                        pos++;
+                        return token = 39 /* AsteriskToken */;
+                    case 43 /* plus */:
+                        if (text.charCodeAt(pos + 1) === 43 /* plus */) {
+                            return pos += 2, token = 43 /* PlusPlusToken */;
+                        }
+                        if (text.charCodeAt(pos + 1) === 61 /* equals */) {
+                            return pos += 2, token = 59 /* PlusEqualsToken */;
+                        }
+                        pos++;
+                        return token = 37 /* PlusToken */;
+                    case 44 /* comma */:
+                        pos++;
+                        return token = 26 /* CommaToken */;
+                    case 45 /* minus */:
+                        if (text.charCodeAt(pos + 1) === 45 /* minus */) {
+                            return pos += 2, token = 44 /* MinusMinusToken */;
+                        }
+                        if (text.charCodeAt(pos + 1) === 61 /* equals */) {
+                            return pos += 2, token = 60 /* MinusEqualsToken */;
+                        }
+                        pos++;
+                        return token = 38 /* MinusToken */;
+                    case 46 /* dot */:
+                        if (isDigit(text.charCodeAt(pos + 1))) {
+                            tokenValue = scanNumber();
+                            return token = 8 /* NumericLiteral */;
+                        }
+                        if (text.charCodeAt(pos + 1) === 46 /* dot */ && text.charCodeAt(pos + 2) === 46 /* dot */) {
+                            return pos += 3, token = 24 /* DotDotDotToken */;
+                        }
+                        pos++;
+                        return token = 23 /* DotToken */;
+                    case 47 /* slash */:
+                        // Single-line comment
+                        if (text.charCodeAt(pos + 1) === 47 /* slash */) {
+                            pos += 2;
+                            while (pos < end) {
+                                if (isLineBreak(text.charCodeAt(pos))) {
+                                    break;
+                                }
+                                pos++;
+                            }
+                            if (skipTrivia) {
+                                continue;
+                            }
+                            else {
+                                return token = 2 /* SingleLineCommentTrivia */;
+                            }
+                        }
+                        // Multi-line comment
+                        if (text.charCodeAt(pos + 1) === 42 /* asterisk */) {
+                            pos += 2;
+                            if (text.charCodeAt(pos) === 42 /* asterisk */ && text.charCodeAt(pos + 1) !== 47 /* slash */) {
+                                tokenFlags |= 2 /* PrecedingJSDocComment */;
+                            }
+                            var commentClosed = false;
+                            while (pos < end) {
+                                var ch_1 = text.charCodeAt(pos);
+                                if (ch_1 === 42 /* asterisk */ && text.charCodeAt(pos + 1) === 47 /* slash */) {
+                                    pos += 2;
+                                    commentClosed = true;
+                                    break;
+                                }
+                                if (isLineBreak(ch_1)) {
+                                    tokenFlags |= 1 /* PrecedingLineBreak */;
+                                }
+                                pos++;
+                            }
+                            if (!commentClosed) {
+                                error(ts.Diagnostics.Asterisk_Slash_expected);
+                            }
+                            if (skipTrivia) {
+                                continue;
+                            }
+                            else {
+                                if (!commentClosed) {
+                                    tokenFlags |= 4 /* Unterminated */;
+                                }
+                                return token = 3 /* MultiLineCommentTrivia */;
+                            }
+                        }
+                        if (text.charCodeAt(pos + 1) === 61 /* equals */) {
+                            return pos += 2, token = 63 /* SlashEqualsToken */;
+                        }
+                        pos++;
+                        return token = 41 /* SlashToken */;
+                    case 48 /* _0 */:
+                        if (pos + 2 < end && (text.charCodeAt(pos + 1) === 88 /* X */ || text.charCodeAt(pos + 1) === 120 /* x */)) {
+                            pos += 2;
+                            var value = scanMinimumNumberOfHexDigits(1, /*canHaveSeparators*/ true);
+                            if (value < 0) {
+                                error(ts.Diagnostics.Hexadecimal_digit_expected);
+                                value = 0;
+                            }
+                            tokenValue = "" + value;
+                            tokenFlags |= 64 /* HexSpecifier */;
+                            return token = 8 /* NumericLiteral */;
+                        }
+                        else if (pos + 2 < end && (text.charCodeAt(pos + 1) === 66 /* B */ || text.charCodeAt(pos + 1) === 98 /* b */)) {
+                            pos += 2;
+                            var value = scanBinaryOrOctalDigits(/* base */ 2);
+                            if (value < 0) {
+                                error(ts.Diagnostics.Binary_digit_expected);
+                                value = 0;
+                            }
+                            tokenValue = "" + value;
+                            tokenFlags |= 128 /* BinarySpecifier */;
+                            return token = 8 /* NumericLiteral */;
+                        }
+                        else if (pos + 2 < end && (text.charCodeAt(pos + 1) === 79 /* O */ || text.charCodeAt(pos + 1) === 111 /* o */)) {
+                            pos += 2;
+                            var value = scanBinaryOrOctalDigits(/* base */ 8);
+                            if (value < 0) {
+                                error(ts.Diagnostics.Octal_digit_expected);
+                                value = 0;
+                            }
+                            tokenValue = "" + value;
+                            tokenFlags |= 256 /* OctalSpecifier */;
+                            return token = 8 /* NumericLiteral */;
+                        }
+                        // Try to parse as an octal
+                        if (pos + 1 < end && isOctalDigit(text.charCodeAt(pos + 1))) {
+                            tokenValue = "" + scanOctalDigits();
+                            tokenFlags |= 32 /* Octal */;
+                            return token = 8 /* NumericLiteral */;
+                        }
+                    // This fall-through is a deviation from the EcmaScript grammar. The grammar says that a leading zero
+                    // can only be followed by an octal digit, a dot, or the end of the number literal. However, we are being
+                    // permissive and allowing decimal digits of the form 08* and 09* (which many browsers also do).
+                    // falls through
+                    case 49 /* _1 */:
+                    case 50 /* _2 */:
+                    case 51 /* _3 */:
+                    case 52 /* _4 */:
+                    case 53 /* _5 */:
+                    case 54 /* _6 */:
+                    case 55 /* _7 */:
+                    case 56 /* _8 */:
+                    case 57 /* _9 */:
+                        tokenValue = scanNumber();
+                        return token = 8 /* NumericLiteral */;
+                    case 58 /* colon */:
+                        pos++;
+                        return token = 56 /* ColonToken */;
+                    case 59 /* semicolon */:
+                        pos++;
+                        return token = 25 /* SemicolonToken */;
+                    case 60 /* lessThan */:
+                        if (isConflictMarkerTrivia(text, pos)) {
+                            pos = scanConflictMarkerTrivia(text, pos, error);
+                            if (skipTrivia) {
+                                continue;
+                            }
+                            else {
+                                return token = 7 /* ConflictMarkerTrivia */;
+                            }
+                        }
+                        if (text.charCodeAt(pos + 1) === 60 /* lessThan */) {
+                            if (text.charCodeAt(pos + 2) === 61 /* equals */) {
+                                return pos += 3, token = 65 /* LessThanLessThanEqualsToken */;
+                            }
+                            return pos += 2, token = 45 /* LessThanLessThanToken */;
+                        }
+                        if (text.charCodeAt(pos + 1) === 61 /* equals */) {
+                            return pos += 2, token = 30 /* LessThanEqualsToken */;
+                        }
+                        if (languageVariant === 1 /* JSX */ &&
+                            text.charCodeAt(pos + 1) === 47 /* slash */ &&
+                            text.charCodeAt(pos + 2) !== 42 /* asterisk */) {
+                            return pos += 2, token = 28 /* LessThanSlashToken */;
+                        }
+                        pos++;
+                        return token = 27 /* LessThanToken */;
+                    case 61 /* equals */:
+                        if (isConflictMarkerTrivia(text, pos)) {
+                            pos = scanConflictMarkerTrivia(text, pos, error);
+                            if (skipTrivia) {
+                                continue;
+                            }
+                            else {
+                                return token = 7 /* ConflictMarkerTrivia */;
+                            }
+                        }
+                        if (text.charCodeAt(pos + 1) === 61 /* equals */) {
+                            if (text.charCodeAt(pos + 2) === 61 /* equals */) {
+                                return pos += 3, token = 34 /* EqualsEqualsEqualsToken */;
+                            }
+                            return pos += 2, token = 32 /* EqualsEqualsToken */;
+                        }
+                        if (text.charCodeAt(pos + 1) === 62 /* greaterThan */) {
+                            return pos += 2, token = 36 /* EqualsGreaterThanToken */;
+                        }
+                        pos++;
+                        return token = 58 /* EqualsToken */;
+                    case 62 /* greaterThan */:
+                        if (isConflictMarkerTrivia(text, pos)) {
+                            pos = scanConflictMarkerTrivia(text, pos, error);
+                            if (skipTrivia) {
+                                continue;
+                            }
+                            else {
+                                return token = 7 /* ConflictMarkerTrivia */;
+                            }
+                        }
+                        pos++;
+                        return token = 29 /* GreaterThanToken */;
+                    case 63 /* question */:
+                        pos++;
+                        return token = 55 /* QuestionToken */;
+                    case 91 /* openBracket */:
+                        pos++;
+                        return token = 21 /* OpenBracketToken */;
+                    case 93 /* closeBracket */:
+                        pos++;
+                        return token = 22 /* CloseBracketToken */;
+                    case 94 /* caret */:
+                        if (text.charCodeAt(pos + 1) === 61 /* equals */) {
+                            return pos += 2, token = 70 /* CaretEqualsToken */;
+                        }
+                        pos++;
+                        return token = 50 /* CaretToken */;
+                    case 123 /* openBrace */:
+                        pos++;
+                        return token = 17 /* OpenBraceToken */;
+                    case 124 /* bar */:
+                        if (isConflictMarkerTrivia(text, pos)) {
+                            pos = scanConflictMarkerTrivia(text, pos, error);
+                            if (skipTrivia) {
+                                continue;
+                            }
+                            else {
+                                return token = 7 /* ConflictMarkerTrivia */;
+                            }
+                        }
+                        if (text.charCodeAt(pos + 1) === 124 /* bar */) {
+                            return pos += 2, token = 54 /* BarBarToken */;
+                        }
+                        if (text.charCodeAt(pos + 1) === 61 /* equals */) {
+                            return pos += 2, token = 69 /* BarEqualsToken */;
+                        }
+                        pos++;
+                        return token = 49 /* BarToken */;
+                    case 125 /* closeBrace */:
+                        pos++;
+                        return token = 18 /* CloseBraceToken */;
+                    case 126 /* tilde */:
+                        pos++;
+                        return token = 52 /* TildeToken */;
+                    case 64 /* at */:
+                        pos++;
+                        return token = 57 /* AtToken */;
+                    case 92 /* backslash */:
+                        var cookedChar = peekUnicodeEscape();
+                        if (cookedChar >= 0 && isIdentifierStart(cookedChar, languageVersion)) {
+                            pos += 6;
+                            tokenValue = String.fromCharCode(cookedChar) + scanIdentifierParts();
+                            return token = getIdentifierToken();
+                        }
+                        error(ts.Diagnostics.Invalid_character);
+                        pos++;
+                        return token = 0 /* Unknown */;
+                    default:
+                        if (isIdentifierStart(ch, languageVersion)) {
+                            pos++;
+                            while (pos < end && isIdentifierPart(ch = text.charCodeAt(pos), languageVersion))
+                                pos++;
+                            tokenValue = text.substring(tokenPos, pos);
+                            if (ch === 92 /* backslash */) {
+                                tokenValue += scanIdentifierParts();
+                            }
+                            return token = getIdentifierToken();
+                        }
+                        else if (isWhiteSpaceSingleLine(ch)) {
+                            pos++;
+                            continue;
+                        }
+                        else if (isLineBreak(ch)) {
+                            tokenFlags |= 1 /* PrecedingLineBreak */;
+                            pos++;
+                            continue;
+                        }
+                        error(ts.Diagnostics.Invalid_character);
+                        pos++;
+                        return token = 0 /* Unknown */;
+                }
+            }
+        }
+        function reScanGreaterToken() {
+            if (token === 29 /* GreaterThanToken */) {
+                if (text.charCodeAt(pos) === 62 /* greaterThan */) {
+                    if (text.charCodeAt(pos + 1) === 62 /* greaterThan */) {
+                        if (text.charCodeAt(pos + 2) === 61 /* equals */) {
+                            return pos += 3, token = 67 /* GreaterThanGreaterThanGreaterThanEqualsToken */;
+                        }
+                        return pos += 2, token = 47 /* GreaterThanGreaterThanGreaterThanToken */;
+                    }
+                    if (text.charCodeAt(pos + 1) === 61 /* equals */) {
+                        return pos += 2, token = 66 /* GreaterThanGreaterThanEqualsToken */;
+                    }
+                    pos++;
+                    return token = 46 /* GreaterThanGreaterThanToken */;
+                }
+                if (text.charCodeAt(pos) === 61 /* equals */) {
+                    pos++;
+                    return token = 31 /* GreaterThanEqualsToken */;
+                }
+            }
+            return token;
+        }
+        function reScanSlashToken() {
+            if (token === 41 /* SlashToken */ || token === 63 /* SlashEqualsToken */) {
+                var p = tokenPos + 1;
+                var inEscape = false;
+                var inCharacterClass = false;
+                while (true) {
+                    // If we reach the end of a file, or hit a newline, then this is an unterminated
+                    // regex.  Report error and return what we have so far.
+                    if (p >= end) {
+                        tokenFlags |= 4 /* Unterminated */;
+                        error(ts.Diagnostics.Unterminated_regular_expression_literal);
+                        break;
+                    }
+                    var ch = text.charCodeAt(p);
+                    if (isLineBreak(ch)) {
+                        tokenFlags |= 4 /* Unterminated */;
+                        error(ts.Diagnostics.Unterminated_regular_expression_literal);
+                        break;
+                    }
+                    if (inEscape) {
+                        // Parsing an escape character;
+                        // reset the flag and just advance to the next char.
+                        inEscape = false;
+                    }
+                    else if (ch === 47 /* slash */ && !inCharacterClass) {
+                        // A slash within a character class is permissible,
+                        // but in general it signals the end of the regexp literal.
+                        p++;
+                        break;
+                    }
+                    else if (ch === 91 /* openBracket */) {
+                        inCharacterClass = true;
+                    }
+                    else if (ch === 92 /* backslash */) {
+                        inEscape = true;
+                    }
+                    else if (ch === 93 /* closeBracket */) {
+                        inCharacterClass = false;
+                    }
+                    p++;
+                }
+                while (p < end && isIdentifierPart(text.charCodeAt(p), languageVersion)) {
+                    p++;
+                }
+                pos = p;
+                tokenValue = text.substring(tokenPos, pos);
+                token = 12 /* RegularExpressionLiteral */;
+            }
+            return token;
+        }
+        /**
+         * Unconditionally back up and scan a template expression portion.
+         */
+        function reScanTemplateToken() {
+            ts.Debug.assert(token === 18 /* CloseBraceToken */, "'reScanTemplateToken' should only be called on a '}'");
+            pos = tokenPos;
+            return token = scanTemplateAndSetTokenValue();
+        }
+        function reScanJsxToken() {
+            pos = tokenPos = startPos;
+            return token = scanJsxToken();
+        }
+        function scanJsxToken() {
+            startPos = tokenPos = pos;
+            if (pos >= end) {
+                return token = 1 /* EndOfFileToken */;
+            }
+            var char = text.charCodeAt(pos);
+            if (char === 60 /* lessThan */) {
+                if (text.charCodeAt(pos + 1) === 47 /* slash */) {
+                    pos += 2;
+                    return token = 28 /* LessThanSlashToken */;
+                }
+                pos++;
+                return token = 27 /* LessThanToken */;
+            }
+            if (char === 123 /* openBrace */) {
+                pos++;
+                return token = 17 /* OpenBraceToken */;
+            }
+            // First non-whitespace character on this line.
+            var firstNonWhitespace = 0;
+            // These initial values are special because the first line is:
+            // firstNonWhitespace = 0 to indicate that we want leading whitspace,
+            while (pos < end) {
+                char = text.charCodeAt(pos);
+                if (char === 123 /* openBrace */) {
+                    break;
+                }
+                if (char === 60 /* lessThan */) {
+                    if (isConflictMarkerTrivia(text, pos)) {
+                        pos = scanConflictMarkerTrivia(text, pos, error);
+                        return token = 7 /* ConflictMarkerTrivia */;
+                    }
+                    break;
+                }
+                // FirstNonWhitespace is 0, then we only see whitespaces so far. If we see a linebreak, we want to ignore that whitespaces.
+                // i.e (- : whitespace)
+                //      <div>----
+                //      </div> becomes <div></div>
+                //
+                //      <div>----</div> becomes <div>----</div>
+                if (isLineBreak(char) && firstNonWhitespace === 0) {
+                    firstNonWhitespace = -1;
+                }
+                else if (!isWhiteSpaceLike(char)) {
+                    firstNonWhitespace = pos;
+                }
+                pos++;
+            }
+            return firstNonWhitespace === -1 ? 11 /* JsxTextAllWhiteSpaces */ : 10 /* JsxText */;
+        }
+        // Scans a JSX identifier; these differ from normal identifiers in that
+        // they allow dashes
+        function scanJsxIdentifier() {
+            if (tokenIsIdentifierOrKeyword(token)) {
+                var firstCharPosition = pos;
+                while (pos < end) {
+                    var ch = text.charCodeAt(pos);
+                    if (ch === 45 /* minus */ || ((firstCharPosition === pos) ? isIdentifierStart(ch, languageVersion) : isIdentifierPart(ch, languageVersion))) {
+                        pos++;
+                    }
+                    else {
+                        break;
+                    }
+                }
+                tokenValue += text.substring(firstCharPosition, pos);
+            }
+            return token;
+        }
+        function scanJsxAttributeValue() {
+            startPos = pos;
+            switch (text.charCodeAt(pos)) {
+                case 34 /* doubleQuote */:
+                case 39 /* singleQuote */:
+                    tokenValue = scanString(/*jsxAttributeString*/ true);
+                    return token = 9 /* StringLiteral */;
+                default:
+                    // If this scans anything other than `{`, it's a parse error.
+                    return scan();
+            }
+        }
+        function scanJSDocToken() {
+            startPos = tokenPos = pos;
+            if (pos >= end) {
+                return token = 1 /* EndOfFileToken */;
+            }
+            var ch = text.charCodeAt(pos);
+            pos++;
+            switch (ch) {
+                case 9 /* tab */:
+                case 11 /* verticalTab */:
+                case 12 /* formFeed */:
+                case 32 /* space */:
+                    while (pos < end && isWhiteSpaceSingleLine(text.charCodeAt(pos))) {
+                        pos++;
+                    }
+                    return token = 5 /* WhitespaceTrivia */;
+                case 64 /* at */:
+                    return token = 57 /* AtToken */;
+                case 10 /* lineFeed */:
+                case 13 /* carriageReturn */:
+                    return token = 4 /* NewLineTrivia */;
+                case 42 /* asterisk */:
+                    return token = 39 /* AsteriskToken */;
+                case 123 /* openBrace */:
+                    return token = 17 /* OpenBraceToken */;
+                case 125 /* closeBrace */:
+                    return token = 18 /* CloseBraceToken */;
+                case 91 /* openBracket */:
+                    return token = 21 /* OpenBracketToken */;
+                case 93 /* closeBracket */:
+                    return token = 22 /* CloseBracketToken */;
+                case 60 /* lessThan */:
+                    return token = 27 /* LessThanToken */;
+                case 61 /* equals */:
+                    return token = 58 /* EqualsToken */;
+                case 44 /* comma */:
+                    return token = 26 /* CommaToken */;
+                case 46 /* dot */:
+                    return token = 23 /* DotToken */;
+                case 96 /* backtick */:
+                    while (pos < end && text.charCodeAt(pos) !== 96 /* backtick */) {
+                        pos++;
+                    }
+                    tokenValue = text.substring(tokenPos + 1, pos);
+                    pos++;
+                    return token = 13 /* NoSubstitutionTemplateLiteral */;
+            }
+            if (isIdentifierStart(ch, 6 /* Latest */)) {
+                while (isIdentifierPart(text.charCodeAt(pos), 6 /* Latest */) && pos < end) {
+                    pos++;
+                }
+                tokenValue = text.substring(tokenPos, pos);
+                return token = 71 /* Identifier */;
+            }
+            else {
+                return token = 0 /* Unknown */;
+            }
+        }
+        function speculationHelper(callback, isLookahead) {
+            var savePos = pos;
+            var saveStartPos = startPos;
+            var saveTokenPos = tokenPos;
+            var saveToken = token;
+            var saveTokenValue = tokenValue;
+            var saveTokenFlags = tokenFlags;
+            var result = callback();
+            // If our callback returned something 'falsy' or we're just looking ahead,
+            // then unconditionally restore us to where we were.
+            if (!result || isLookahead) {
+                pos = savePos;
+                startPos = saveStartPos;
+                tokenPos = saveTokenPos;
+                token = saveToken;
+                tokenValue = saveTokenValue;
+                tokenFlags = saveTokenFlags;
+            }
+            return result;
+        }
+        function scanRange(start, length, callback) {
+            var saveEnd = end;
+            var savePos = pos;
+            var saveStartPos = startPos;
+            var saveTokenPos = tokenPos;
+            var saveToken = token;
+            var saveTokenValue = tokenValue;
+            var saveTokenFlags = tokenFlags;
+            setText(text, start, length);
+            var result = callback();
+            end = saveEnd;
+            pos = savePos;
+            startPos = saveStartPos;
+            tokenPos = saveTokenPos;
+            token = saveToken;
+            tokenValue = saveTokenValue;
+            tokenFlags = saveTokenFlags;
+            return result;
+        }
+        function lookAhead(callback) {
+            return speculationHelper(callback, /*isLookahead*/ true);
+        }
+        function tryScan(callback) {
+            return speculationHelper(callback, /*isLookahead*/ false);
+        }
+        function getText() {
+            return text;
+        }
+        function setText(newText, start, length) {
+            text = newText || "";
+            end = length === undefined ? text.length : start + length;
+            setTextPos(start || 0);
+        }
+        function setOnError(errorCallback) {
+            onError = errorCallback;
+        }
+        function setScriptTarget(scriptTarget) {
+            languageVersion = scriptTarget;
+        }
+        function setLanguageVariant(variant) {
+            languageVariant = variant;
+        }
+        function setTextPos(textPos) {
+            ts.Debug.assert(textPos >= 0);
+            pos = textPos;
+            startPos = textPos;
+            tokenPos = textPos;
+            token = 0 /* Unknown */;
+            tokenValue = undefined;
+            tokenFlags = 0;
+        }
+    }
+    ts.createScanner = createScanner;
+})(ts || (ts = {}));
+/** Non-internal stuff goes here */
+var ts;
+(function (ts) {
+    ts.emptyArray = [];
+    function closeFileWatcher(watcher) {
+        watcher.close();
+    }
+    ts.closeFileWatcher = closeFileWatcher;
+    function isExternalModuleNameRelative(moduleName) {
+        // TypeScript 1.0 spec (April 2014): 11.2.1
+        // An external module name is "relative" if the first term is "." or "..".
+        // Update: We also consider a path like `C:\foo.ts` "relative" because we do not search for it in `node_modules` or treat it as an ambient module.
+        return ts.pathIsRelative(moduleName) || ts.isRootedDiskPath(moduleName);
+    }
+    ts.isExternalModuleNameRelative = isExternalModuleNameRelative;
+    function sortAndDeduplicateDiagnostics(diagnostics) {
+        return ts.sortAndDeduplicate(diagnostics, ts.compareDiagnostics);
+    }
+    ts.sortAndDeduplicateDiagnostics = sortAndDeduplicateDiagnostics;
+    function toPath(fileName, basePath, getCanonicalFileName) {
+        var nonCanonicalizedPath = ts.isRootedDiskPath(fileName)
+            ? ts.normalizePath(fileName)
+            : ts.getNormalizedAbsolutePath(fileName, basePath);
+        return getCanonicalFileName(nonCanonicalizedPath);
+    }
+    ts.toPath = toPath;
+    function hasEntries(map) {
+        return !!map && !!map.size;
+    }
+    ts.hasEntries = hasEntries;
+})(ts || (ts = {}));
+/* @internal */
 (function (ts) {
     ts.resolvingEmptyArray = [];
     ts.emptyMap = ts.createMap();
@@ -4767,6 +7493,22 @@ var ts;
         return undefined;
     }
     ts.getDeclarationOfKind = getDeclarationOfKind;
+    /** Create a new escaped identifier map. */
+    function createUnderscoreEscapedMap() {
+        return new ts.MapCtr();
+    }
+    ts.createUnderscoreEscapedMap = createUnderscoreEscapedMap;
+    function createSymbolTable(symbols) {
+        var result = ts.createMap();
+        if (symbols) {
+            for (var _i = 0, symbols_1 = symbols; _i < symbols_1.length; _i++) {
+                var symbol = symbols_1[_i];
+                result.set(symbol.escapedName, symbol);
+            }
+        }
+        return result;
+    }
+    ts.createSymbolTable = createSymbolTable;
     var stringWriter = createSingleLineStringWriter();
     function createSingleLineStringWriter() {
         var str = "";
@@ -4790,6 +7532,8 @@ var ts;
             getColumn: function () { return 0; },
             getIndent: function () { return 0; },
             isAtStartOfLine: function () { return false; },
+            // Completely ignore indentation for string writers.  And map newlines to
+            // a single space.
             writeLine: function () { return str += " "; },
             increaseIndent: ts.noop,
             decreaseIndent: ts.noop,
@@ -4800,6 +7544,80 @@ var ts;
             reportPrivateInBaseOfClassExpression: ts.noop,
         };
     }
+    function changesAffectModuleResolution(oldOptions, newOptions) {
+        return !oldOptions ||
+            (oldOptions.module !== newOptions.module) ||
+            (oldOptions.moduleResolution !== newOptions.moduleResolution) ||
+            (oldOptions.noResolve !== newOptions.noResolve) ||
+            (oldOptions.target !== newOptions.target) ||
+            (oldOptions.noLib !== newOptions.noLib) ||
+            (oldOptions.jsx !== newOptions.jsx) ||
+            (oldOptions.allowJs !== newOptions.allowJs) ||
+            (oldOptions.rootDir !== newOptions.rootDir) ||
+            (oldOptions.configFilePath !== newOptions.configFilePath) ||
+            (oldOptions.baseUrl !== newOptions.baseUrl) ||
+            (oldOptions.maxNodeModuleJsDepth !== newOptions.maxNodeModuleJsDepth) ||
+            !ts.arrayIsEqualTo(oldOptions.lib, newOptions.lib) ||
+            !ts.arrayIsEqualTo(oldOptions.typeRoots, newOptions.typeRoots) ||
+            !ts.arrayIsEqualTo(oldOptions.rootDirs, newOptions.rootDirs) ||
+            !ts.equalOwnProperties(oldOptions.paths, newOptions.paths);
+    }
+    ts.changesAffectModuleResolution = changesAffectModuleResolution;
+    function findAncestor(node, callback) {
+        while (node) {
+            var result = callback(node);
+            if (result === "quit") {
+                return undefined;
+            }
+            else if (result) {
+                return node;
+            }
+            node = node.parent;
+        }
+        return undefined;
+    }
+    ts.findAncestor = findAncestor;
+    function forEachEntry(map, callback) {
+        var _a;
+        var iterator = map.entries();
+        for (var _b = iterator.next(), pair = _b.value, done = _b.done; !done; _a = iterator.next(), pair = _a.value, done = _a.done, _a) {
+            var key = pair[0], value = pair[1];
+            var result = callback(value, key);
+            if (result) {
+                return result;
+            }
+        }
+        return undefined;
+    }
+    ts.forEachEntry = forEachEntry;
+    function forEachKey(map, callback) {
+        var _a;
+        var iterator = map.keys();
+        for (var _b = iterator.next(), key = _b.value, done = _b.done; !done; _a = iterator.next(), key = _a.value, done = _a.done, _a) {
+            var result = callback(key);
+            if (result) {
+                return result;
+            }
+        }
+        return undefined;
+    }
+    ts.forEachKey = forEachKey;
+    function copyEntries(source, target) {
+        source.forEach(function (value, key) {
+            target.set(key, value);
+        });
+    }
+    ts.copyEntries = copyEntries;
+    function arrayToSet(array, makeKey) {
+        return ts.arrayToMap(array, makeKey || (function (s) { return s; }), function () { return true; });
+    }
+    ts.arrayToSet = arrayToSet;
+    function cloneMap(map) {
+        var clone = ts.createMap();
+        copyEntries(map, clone);
+        return clone;
+    }
+    ts.cloneMap = cloneMap;
     function usingSingleLineStringWriter(action) {
         var oldString = stringWriter.getText();
         try {
@@ -4870,23 +7688,31 @@ var ts;
         return false;
     }
     ts.hasChangesInResolutions = hasChangesInResolutions;
+    // Returns true if this node contains a parse error anywhere underneath it.
     function containsParseError(node) {
         aggregateChildData(node);
-        return (node.flags & 131072) !== 0;
+        return (node.flags & 131072 /* ThisNodeOrAnySubNodesHasError */) !== 0;
     }
     ts.containsParseError = containsParseError;
     function aggregateChildData(node) {
-        if (!(node.flags & 262144)) {
-            var thisNodeOrAnySubNodesHasError = ((node.flags & 32768) !== 0) ||
+        if (!(node.flags & 262144 /* HasAggregatedChildData */)) {
+            // A node is considered to contain a parse error if:
+            //  a) the parser explicitly marked that it had an error
+            //  b) any of it's children reported that it had an error.
+            var thisNodeOrAnySubNodesHasError = ((node.flags & 32768 /* ThisNodeHasError */) !== 0) ||
                 ts.forEachChild(node, containsParseError);
+            // If so, mark ourselves accordingly.
             if (thisNodeOrAnySubNodesHasError) {
-                node.flags |= 131072;
+                node.flags |= 131072 /* ThisNodeOrAnySubNodesHasError */;
             }
-            node.flags |= 262144;
+            // Also mark that we've propagated the child information to this node.  This way we can
+            // always consult the bit directly on this node without needing to check its children
+            // again.
+            node.flags |= 262144 /* HasAggregatedChildData */;
         }
     }
     function getSourceFileOfNode(node) {
-        while (node && node.kind !== 274) {
+        while (node && node.kind !== 274 /* SourceFile */) {
             node = node.parent;
         }
         return node;
@@ -4894,11 +7720,11 @@ var ts;
     ts.getSourceFileOfNode = getSourceFileOfNode;
     function isStatementWithLocals(node) {
         switch (node.kind) {
-            case 213:
-            case 241:
-            case 220:
-            case 221:
-            case 222:
+            case 213 /* Block */:
+            case 241 /* CaseBlock */:
+            case 220 /* ForStatement */:
+            case 221 /* ForInStatement */:
+            case 222 /* ForOfStatement */:
                 return true;
         }
         return false;
@@ -4909,6 +7735,7 @@ var ts;
         return ts.getLineStarts(sourceFile)[line];
     }
     ts.getStartPositionOfLine = getStartPositionOfLine;
+    // This is a useful function for debugging purposes.
     function nodePosToString(node) {
         var file = getSourceFileOfNode(node);
         var loc = ts.getLineAndCharacterOfPosition(file, node.pos);
@@ -4921,12 +7748,19 @@ var ts;
         var lineIndex = line;
         var sourceText = sourceFile.text;
         if (lineIndex + 1 === lineStarts.length) {
+            // last line - return EOF
             return sourceText.length - 1;
         }
         else {
+            // current line start
             var start = lineStarts[lineIndex];
+            // take the start position of the next line - 1 = it should be some line break
             var pos = lineStarts[lineIndex + 1] - 1;
             ts.Debug.assert(ts.isLineBreak(sourceText.charCodeAt(pos)));
+            // walk backwards skipping line breaks, stop the the beginning of current line.
+            // i.e:
+            // <some text>
+            // $ <- end of line for this position should match the start position
             while (start <= pos && ts.isLineBreak(sourceText.charCodeAt(pos))) {
                 pos--;
             }
@@ -4934,21 +7768,45 @@ var ts;
         }
     }
     ts.getEndLinePosition = getEndLinePosition;
+    /**
+     * Returns a value indicating whether a name is unique globally or within the current file.
+     * Note: This does not consider whether a name appears as a free identifier or not, so at the expression `x.y` this includes both `x` and `y`.
+     */
     function isFileLevelUniqueName(sourceFile, name, hasGlobalName) {
         return !(hasGlobalName && hasGlobalName(name)) && !sourceFile.identifiers.has(name);
     }
     ts.isFileLevelUniqueName = isFileLevelUniqueName;
+    // Returns true if this node is missing from the actual source code. A 'missing' node is different
+    // from 'undefined/defined'. When a node is undefined (which can happen for optional nodes
+    // in the tree), it is definitely missing. However, a node may be defined, but still be
+    // missing.  This happens whenever the parser knows it needs to parse something, but can't
+    // get anything in the source code that it expects at that location. For example:
+    //
+    //          let a: ;
+    //
+    // Here, the Type in the Type-Annotation is not-optional (as there is a colon in the source
+    // code). So the parser will attempt to parse out a type, and will create an actual node.
+    // However, this node will be 'missing' in the sense that no actual source-code/tokens are
+    // contained within it.
     function nodeIsMissing(node) {
         if (node === undefined) {
             return true;
         }
-        return node.pos === node.end && node.pos >= 0 && node.kind !== 1;
+        return node.pos === node.end && node.pos >= 0 && node.kind !== 1 /* EndOfFileToken */;
     }
     ts.nodeIsMissing = nodeIsMissing;
     function nodeIsPresent(node) {
         return !nodeIsMissing(node);
     }
     ts.nodeIsPresent = nodeIsPresent;
+    /**
+     * Appends a range of value to begin of an array, returning the array.
+     *
+     * @param to The array to which `value` is to be appended. If `to` is `undefined`, a new array
+     * is created if `value` was appended.
+     * @param from The values to append to the array. If `from` is `undefined`, nothing is
+     * appended. If an element of `from` is `undefined`, that element is not appended.
+     */
     function prependStatements(to, from) {
         if (from === undefined || from.length === 0)
             return to;
@@ -4962,10 +7820,17 @@ var ts;
         return to;
     }
     ts.prependStatements = prependStatements;
+    /**
+     * Determine if the given comment is a triple-slash
+     *
+     * @return true if the comment is a triple-slash comment else false
+     */
     function isRecognizedTripleSlashComment(text, commentPos, commentEnd) {
-        if (text.charCodeAt(commentPos + 1) === 47 &&
+        // Verify this is /// comment, but do the regexp match only when we first can find /// in the comment text
+        // so that we don't end up computing comment string and doing match for all // comments
+        if (text.charCodeAt(commentPos + 1) === 47 /* slash */ &&
             commentPos + 2 < commentEnd &&
-            text.charCodeAt(commentPos + 2) === 47) {
+            text.charCodeAt(commentPos + 2) === 47 /* slash */) {
             var textSubStr = text.substring(commentPos, commentEnd);
             return textSubStr.match(ts.fullTripleSlashReferencePathRegEx) ||
                 textSubStr.match(ts.fullTripleSlashAMDReferencePathRegEx) ||
@@ -4977,21 +7842,27 @@ var ts;
     }
     ts.isRecognizedTripleSlashComment = isRecognizedTripleSlashComment;
     function isPinnedComment(text, start) {
-        return text.charCodeAt(start + 1) === 42 &&
-            text.charCodeAt(start + 2) === 33;
+        return text.charCodeAt(start + 1) === 42 /* asterisk */ &&
+            text.charCodeAt(start + 2) === 33 /* exclamation */;
     }
     ts.isPinnedComment = isPinnedComment;
     function getTokenPosOfNode(node, sourceFile, includeJsDoc) {
+        // With nodes that have no width (i.e. 'Missing' nodes), we actually *don't*
+        // want to skip trivia because this will launch us forward to the next token.
         if (nodeIsMissing(node)) {
             return node.pos;
         }
         if (ts.isJSDocNode(node)) {
-            return ts.skipTrivia((sourceFile || getSourceFileOfNode(node)).text, node.pos, false, true);
+            return ts.skipTrivia((sourceFile || getSourceFileOfNode(node)).text, node.pos, /*stopAfterLineBreak*/ false, /*stopAtComments*/ true);
         }
         if (includeJsDoc && ts.hasJSDocNodes(node)) {
             return getTokenPosOfNode(node.jsDoc[0]);
         }
-        if (node.kind === 299 && node._children.length > 0) {
+        // For a syntax list, it is possible that one of its children has JSDocComment nodes, while
+        // the syntax list itself considers them as normal trivia. Therefore if we simply skip
+        // trivia for the list, we may have skipped the JSDocComment as well. So we should process its
+        // first child to determine the actual position of its first token.
+        if (node.kind === 299 /* SyntaxList */ && node._children.length > 0) {
             return getTokenPosOfNode(node._children[0], sourceFile, includeJsDoc);
         }
         return ts.skipTrivia((sourceFile || getSourceFileOfNode(node)).text, node.pos);
@@ -5025,38 +7896,51 @@ var ts;
     function getPos(range) {
         return range.pos;
     }
+    /**
+     * Note: it is expected that the `nodeArray` and the `node` are within the same file.
+     * For example, searching for a `SourceFile` in a `SourceFile[]` wouldn't work.
+     */
     function indexOfNode(nodeArray, node) {
         return ts.binarySearch(nodeArray, node, getPos, ts.compareValues);
     }
     ts.indexOfNode = indexOfNode;
+    /**
+     * Gets flags that control emit behavior of a node.
+     */
     function getEmitFlags(node) {
         var emitNode = node.emitNode;
         return emitNode && emitNode.flags || 0;
     }
     ts.getEmitFlags = getEmitFlags;
     function getLiteralText(node, sourceFile) {
-        if (!nodeIsSynthesized(node) && node.parent && !(ts.isNumericLiteral(node) && node.numericLiteralFlags & 512)) {
+        // If we don't need to downlevel and we can reach the original source text using
+        // the node's parent reference, then simply get the text as it was originally written.
+        if (!nodeIsSynthesized(node) && node.parent && !(ts.isNumericLiteral(node) && node.numericLiteralFlags & 512 /* ContainsSeparator */)) {
             return getSourceTextOfNodeFromSourceFile(sourceFile, node);
         }
-        var escapeText = getEmitFlags(node) & 16777216 ? escapeString : escapeNonAsciiString;
+        var escapeText = getEmitFlags(node) & 16777216 /* NoAsciiEscaping */ ? escapeString : escapeNonAsciiString;
+        // If we can't reach the original source text, use the canonical form if it's a number,
+        // or a (possibly escaped) quoted form of the original text if it's string-like.
         switch (node.kind) {
-            case 9:
+            case 9 /* StringLiteral */:
                 if (node.singleQuote) {
-                    return "'" + escapeText(node.text, 39) + "'";
+                    return "'" + escapeText(node.text, 39 /* singleQuote */) + "'";
                 }
                 else {
-                    return '"' + escapeText(node.text, 34) + '"';
+                    return '"' + escapeText(node.text, 34 /* doubleQuote */) + '"';
                 }
-            case 13:
-                return "`" + escapeText(node.text, 96) + "`";
-            case 14:
-                return "`" + escapeText(node.text, 96) + "${";
-            case 15:
-                return "}" + escapeText(node.text, 96) + "${";
-            case 16:
-                return "}" + escapeText(node.text, 96) + "`";
-            case 8:
-            case 12:
+            case 13 /* NoSubstitutionTemplateLiteral */:
+                return "`" + escapeText(node.text, 96 /* backtick */) + "`";
+            case 14 /* TemplateHead */:
+                // tslint:disable-next-line no-invalid-template-strings
+                return "`" + escapeText(node.text, 96 /* backtick */) + "${";
+            case 15 /* TemplateMiddle */:
+                // tslint:disable-next-line no-invalid-template-strings
+                return "}" + escapeText(node.text, 96 /* backtick */) + "${";
+            case 16 /* TemplateTail */:
+                return "}" + escapeText(node.text, 96 /* backtick */) + "`";
+            case 8 /* NumericLiteral */:
+            case 12 /* RegularExpressionLiteral */:
                 return node.text;
         }
         return ts.Debug.fail("Literal kind '" + node.kind + "' not accounted for.");
@@ -5066,55 +7950,74 @@ var ts;
         return ts.isString(value) ? '"' + escapeNonAsciiString(value) + '"' : "" + value;
     }
     ts.getTextOfConstantValue = getTextOfConstantValue;
+    // Add an extra underscore to identifiers that start with two underscores to avoid issues with magic names like '__proto__'
     function escapeLeadingUnderscores(identifier) {
-        return (identifier.length >= 2 && identifier.charCodeAt(0) === 95 && identifier.charCodeAt(1) === 95 ? "_" + identifier : identifier);
+        return (identifier.length >= 2 && identifier.charCodeAt(0) === 95 /* _ */ && identifier.charCodeAt(1) === 95 /* _ */ ? "_" + identifier : identifier);
     }
     ts.escapeLeadingUnderscores = escapeLeadingUnderscores;
+    /**
+     * @deprecated Use `id.escapedText` to get the escaped text of an Identifier.
+     * @param identifier The identifier to escape
+     */
     function escapeIdentifier(identifier) {
         return identifier;
     }
     ts.escapeIdentifier = escapeIdentifier;
+    // Make an identifier from an external module name by extracting the string after the last "/" and replacing
+    // all non-alphanumeric characters with underscores
     function makeIdentifierFromModuleName(moduleName) {
         return ts.getBaseFileName(moduleName).replace(/^(\d)/, "_$1").replace(/\W/g, "_");
     }
     ts.makeIdentifierFromModuleName = makeIdentifierFromModuleName;
     function isBlockOrCatchScoped(declaration) {
-        return (ts.getCombinedNodeFlags(declaration) & 3) !== 0 ||
+        return (ts.getCombinedNodeFlags(declaration) & 3 /* BlockScoped */) !== 0 ||
             isCatchClauseVariableDeclarationOrBindingElement(declaration);
     }
     ts.isBlockOrCatchScoped = isBlockOrCatchScoped;
     function isCatchClauseVariableDeclarationOrBindingElement(declaration) {
         var node = getRootDeclaration(declaration);
-        return node.kind === 232 && node.parent.kind === 269;
+        return node.kind === 232 /* VariableDeclaration */ && node.parent.kind === 269 /* CatchClause */;
     }
     ts.isCatchClauseVariableDeclarationOrBindingElement = isCatchClauseVariableDeclarationOrBindingElement;
     function isAmbientModule(node) {
-        return ts.isModuleDeclaration(node) && (node.name.kind === 9 || isGlobalScopeAugmentation(node));
+        return ts.isModuleDeclaration(node) && (node.name.kind === 9 /* StringLiteral */ || isGlobalScopeAugmentation(node));
     }
     ts.isAmbientModule = isAmbientModule;
     function isModuleWithStringLiteralName(node) {
-        return ts.isModuleDeclaration(node) && node.name.kind === 9;
+        return ts.isModuleDeclaration(node) && node.name.kind === 9 /* StringLiteral */;
     }
     ts.isModuleWithStringLiteralName = isModuleWithStringLiteralName;
     function isNonGlobalAmbientModule(node) {
         return ts.isModuleDeclaration(node) && ts.isStringLiteral(node.name);
     }
     ts.isNonGlobalAmbientModule = isNonGlobalAmbientModule;
+    /**
+     * An effective module (namespace) declaration is either
+     * 1. An actual declaration: namespace X { ... }
+     * 2. A Javascript declaration, which is:
+     *    An identifier in a nested property access expression: Y in `X.Y.Z = { ... }`
+     */
+    function isEffectiveModuleDeclaration(node) {
+        return ts.isModuleDeclaration(node) || ts.isIdentifier(node);
+    }
+    ts.isEffectiveModuleDeclaration = isEffectiveModuleDeclaration;
+    /** Given a symbol for a module, checks that it is a shorthand ambient module. */
     function isShorthandAmbientModuleSymbol(moduleSymbol) {
         return isShorthandAmbientModule(moduleSymbol.valueDeclaration);
     }
     ts.isShorthandAmbientModuleSymbol = isShorthandAmbientModuleSymbol;
     function isShorthandAmbientModule(node) {
-        return node && node.kind === 239 && (!node.body);
+        // The only kind of module that can be missing a body is a shorthand ambient module.
+        return node && node.kind === 239 /* ModuleDeclaration */ && (!node.body);
     }
     function isBlockScopedContainerTopLevel(node) {
-        return node.kind === 274 ||
-            node.kind === 239 ||
+        return node.kind === 274 /* SourceFile */ ||
+            node.kind === 239 /* ModuleDeclaration */ ||
             ts.isFunctionLike(node);
     }
     ts.isBlockScopedContainerTopLevel = isBlockScopedContainerTopLevel;
     function isGlobalScopeAugmentation(module) {
-        return !!(module.flags & 512);
+        return !!(module.flags & 512 /* GlobalAugmentation */);
     }
     ts.isGlobalScopeAugmentation = isGlobalScopeAugmentation;
     function isExternalModuleAugmentation(node) {
@@ -5122,10 +8025,13 @@ var ts;
     }
     ts.isExternalModuleAugmentation = isExternalModuleAugmentation;
     function isModuleAugmentationExternal(node) {
+        // external module augmentation is a ambient module declaration that is either:
+        // - defined in the top level scope and source file is an external module
+        // - defined inside ambient module declaration located in the top level scope and source file not an external module
         switch (node.parent.kind) {
-            case 274:
+            case 274 /* SourceFile */:
                 return ts.isExternalModule(node.parent);
-            case 240:
+            case 240 /* ModuleBlock */:
                 return isAmbientModule(node.parent.parent) && ts.isSourceFile(node.parent.parent.parent) && !ts.isExternalModule(node.parent.parent.parent);
         }
         return false;
@@ -5137,22 +8043,24 @@ var ts;
     ts.isEffectiveExternalModule = isEffectiveExternalModule;
     function isBlockScope(node, parentNode) {
         switch (node.kind) {
-            case 274:
-            case 241:
-            case 269:
-            case 239:
-            case 220:
-            case 221:
-            case 222:
-            case 155:
-            case 154:
-            case 156:
-            case 157:
-            case 234:
-            case 192:
-            case 193:
+            case 274 /* SourceFile */:
+            case 241 /* CaseBlock */:
+            case 269 /* CatchClause */:
+            case 239 /* ModuleDeclaration */:
+            case 220 /* ForStatement */:
+            case 221 /* ForInStatement */:
+            case 222 /* ForOfStatement */:
+            case 155 /* Constructor */:
+            case 154 /* MethodDeclaration */:
+            case 156 /* GetAccessor */:
+            case 157 /* SetAccessor */:
+            case 234 /* FunctionDeclaration */:
+            case 192 /* FunctionExpression */:
+            case 193 /* ArrowFunction */:
                 return true;
-            case 213:
+            case 213 /* Block */:
+                // function block is not considered block-scope container
+                // see comment in binder.ts: bind(...), case for SyntaxKind.Block
                 return !ts.isFunctionLike(parentNode);
         }
         return false;
@@ -5160,28 +8068,28 @@ var ts;
     ts.isBlockScope = isBlockScope;
     function isDeclarationWithTypeParameters(node) {
         switch (node.kind) {
-            case 158:
-            case 159:
-            case 153:
-            case 160:
-            case 163:
-            case 164:
-            case 284:
-            case 235:
-            case 205:
-            case 236:
-            case 237:
-            case 296:
-            case 234:
-            case 154:
-            case 155:
-            case 156:
-            case 157:
-            case 192:
-            case 193:
-            case 292:
-            case 297:
-            case 288:
+            case 158 /* CallSignature */:
+            case 159 /* ConstructSignature */:
+            case 153 /* MethodSignature */:
+            case 160 /* IndexSignature */:
+            case 163 /* FunctionType */:
+            case 164 /* ConstructorType */:
+            case 284 /* JSDocFunctionType */:
+            case 235 /* ClassDeclaration */:
+            case 205 /* ClassExpression */:
+            case 236 /* InterfaceDeclaration */:
+            case 237 /* TypeAliasDeclaration */:
+            case 296 /* JSDocTemplateTag */:
+            case 234 /* FunctionDeclaration */:
+            case 154 /* MethodDeclaration */:
+            case 155 /* Constructor */:
+            case 156 /* GetAccessor */:
+            case 157 /* SetAccessor */:
+            case 192 /* FunctionExpression */:
+            case 193 /* ArrowFunction */:
+            case 292 /* JSDocCallbackTag */:
+            case 297 /* JSDocTypedefTag */:
+            case 288 /* JSDocSignature */:
                 return true;
             default:
                 ts.assertTypeIsNever(node);
@@ -5191,8 +8099,8 @@ var ts;
     ts.isDeclarationWithTypeParameters = isDeclarationWithTypeParameters;
     function isAnyImportSyntax(node) {
         switch (node.kind) {
-            case 244:
-            case 243:
+            case 244 /* ImportDeclaration */:
+            case 243 /* ImportEqualsDeclaration */:
                 return true;
             default:
                 return false;
@@ -5201,15 +8109,15 @@ var ts;
     ts.isAnyImportSyntax = isAnyImportSyntax;
     function isLateVisibilityPaintedStatement(node) {
         switch (node.kind) {
-            case 244:
-            case 243:
-            case 214:
-            case 235:
-            case 234:
-            case 239:
-            case 237:
-            case 236:
-            case 238:
+            case 244 /* ImportDeclaration */:
+            case 243 /* ImportEqualsDeclaration */:
+            case 214 /* VariableStatement */:
+            case 235 /* ClassDeclaration */:
+            case 234 /* FunctionDeclaration */:
+            case 239 /* ModuleDeclaration */:
+            case 237 /* TypeAliasDeclaration */:
+            case 236 /* InterfaceDeclaration */:
+            case 238 /* EnumDeclaration */:
                 return true;
             default:
                 return false;
@@ -5220,10 +8128,15 @@ var ts;
         return isAnyImportSyntax(node) || ts.isExportDeclaration(node);
     }
     ts.isAnyImportOrReExport = isAnyImportOrReExport;
+    // Gets the nearest enclosing block scope container that has the provided node
+    // as a descendant, that is not the provided node.
     function getEnclosingBlockScopeContainer(node) {
-        return ts.findAncestor(node.parent, function (current) { return isBlockScope(current, current.parent); });
+        return findAncestor(node.parent, function (current) { return isBlockScope(current, current.parent); });
     }
     ts.getEnclosingBlockScopeContainer = getEnclosingBlockScopeContainer;
+    // Return display name of an identifier
+    // Computed property names will just be emitted as "[<expr>]", where <expr> is the source
+    // text of the expression in the computed property.
     function declarationNameToString(name) {
         return getFullWidth(name) === 0 ? "(Missing)" : getTextOfNode(name);
     }
@@ -5234,13 +8147,13 @@ var ts;
     ts.getNameFromIndexInfo = getNameFromIndexInfo;
     function getTextOfPropertyName(name) {
         switch (name.kind) {
-            case 71:
+            case 71 /* Identifier */:
                 return name.escapedText;
-            case 9:
-            case 8:
+            case 9 /* StringLiteral */:
+            case 8 /* NumericLiteral */:
                 return escapeLeadingUnderscores(name.text);
-            case 147:
-                return isStringOrNumericLiteral(name.expression) ? escapeLeadingUnderscores(name.expression.text) : undefined;
+            case 147 /* ComputedPropertyName */:
+                return isStringOrNumericLiteral(name.expression) ? escapeLeadingUnderscores(name.expression.text) : undefined; // TODO: GH#18217 Almost all uses of this assume the result to be defined!
             default:
                 ts.Debug.assertNever(name);
         }
@@ -5248,11 +8161,11 @@ var ts;
     ts.getTextOfPropertyName = getTextOfPropertyName;
     function entityNameToString(name) {
         switch (name.kind) {
-            case 71:
+            case 71 /* Identifier */:
                 return getFullWidth(name) === 0 ? ts.idText(name) : getTextOfNode(name);
-            case 146:
+            case 146 /* QualifiedName */:
                 return entityNameToString(name.left) + "." + entityNameToString(name.right);
-            case 185:
+            case 185 /* PropertyAccessExpression */:
                 return entityNameToString(name.expression) + "." + entityNameToString(name.name);
             default:
                 throw ts.Debug.assertNever(name);
@@ -5288,7 +8201,7 @@ var ts;
     }
     ts.createDiagnosticForNodeFromMessageChain = createDiagnosticForNodeFromMessageChain;
     function getSpanOfTokenAtPosition(sourceFile, pos) {
-        var scanner = ts.createScanner(sourceFile.languageVersion, true, sourceFile.languageVariant, sourceFile.text, undefined, pos);
+        var scanner = ts.createScanner(sourceFile.languageVersion, /*skipTrivia*/ true, sourceFile.languageVariant, sourceFile.text, /*onError:*/ undefined, pos);
         scanner.scan();
         var start = scanner.getTokenPos();
         return ts.createTextSpanFromBounds(start, scanner.getTextPos());
@@ -5296,10 +8209,12 @@ var ts;
     ts.getSpanOfTokenAtPosition = getSpanOfTokenAtPosition;
     function getErrorSpanForArrowFunction(sourceFile, node) {
         var pos = ts.skipTrivia(sourceFile.text, node.pos);
-        if (node.body && node.body.kind === 213) {
+        if (node.body && node.body.kind === 213 /* Block */) {
             var startLine = ts.getLineAndCharacterOfPosition(sourceFile, node.body.pos).line;
             var endLine = ts.getLineAndCharacterOfPosition(sourceFile, node.body.end).line;
             if (startLine < endLine) {
+                // The arrow function spans multiple lines,
+                // make the error span be the first line, inclusive.
                 return ts.createTextSpan(pos, getEndLinePosition(startLine, sourceFile) - pos + 1);
             }
         }
@@ -5308,40 +8223,46 @@ var ts;
     function getErrorSpanForNode(sourceFile, node) {
         var errorNode = node;
         switch (node.kind) {
-            case 274:
-                var pos_1 = ts.skipTrivia(sourceFile.text, 0, false);
+            case 274 /* SourceFile */:
+                var pos_1 = ts.skipTrivia(sourceFile.text, 0, /*stopAfterLineBreak*/ false);
                 if (pos_1 === sourceFile.text.length) {
+                    // file is empty - return span for the beginning of the file
                     return ts.createTextSpan(0, 0);
                 }
                 return getSpanOfTokenAtPosition(sourceFile, pos_1);
-            case 232:
-            case 182:
-            case 235:
-            case 205:
-            case 236:
-            case 239:
-            case 238:
-            case 273:
-            case 234:
-            case 192:
-            case 154:
-            case 156:
-            case 157:
-            case 237:
-            case 152:
-            case 151:
+            // This list is a work in progress. Add missing node kinds to improve their error
+            // spans.
+            case 232 /* VariableDeclaration */:
+            case 182 /* BindingElement */:
+            case 235 /* ClassDeclaration */:
+            case 205 /* ClassExpression */:
+            case 236 /* InterfaceDeclaration */:
+            case 239 /* ModuleDeclaration */:
+            case 238 /* EnumDeclaration */:
+            case 273 /* EnumMember */:
+            case 234 /* FunctionDeclaration */:
+            case 192 /* FunctionExpression */:
+            case 154 /* MethodDeclaration */:
+            case 156 /* GetAccessor */:
+            case 157 /* SetAccessor */:
+            case 237 /* TypeAliasDeclaration */:
+            case 152 /* PropertyDeclaration */:
+            case 151 /* PropertySignature */:
                 errorNode = node.name;
                 break;
-            case 193:
+            case 193 /* ArrowFunction */:
                 return getErrorSpanForArrowFunction(sourceFile, node);
         }
         if (errorNode === undefined) {
+            // If we don't have a better node, then just set the error on the first token of
+            // construct.
             return getSpanOfTokenAtPosition(sourceFile, node.pos);
         }
         var isMissing = nodeIsMissing(errorNode);
         var pos = isMissing
             ? errorNode.pos
             : ts.skipTrivia(sourceFile.text, errorNode.pos);
+        // These asserts should all be satisfied for a properly constructed `errorNode`.
         if (isMissing) {
             ts.Debug.assert(pos === errorNode.pos, "This failure could trigger https://github.com/Microsoft/TypeScript/issues/20809");
             ts.Debug.assert(pos === errorNode.end, "This failure could trigger https://github.com/Microsoft/TypeScript/issues/20809");
@@ -5358,57 +8279,58 @@ var ts;
     }
     ts.isExternalOrCommonJsModule = isExternalOrCommonJsModule;
     function isJsonSourceFile(file) {
-        return file.scriptKind === 6;
+        return file.scriptKind === 6 /* JSON */;
     }
     ts.isJsonSourceFile = isJsonSourceFile;
     function isConstEnumDeclaration(node) {
-        return node.kind === 238 && isConst(node);
+        return node.kind === 238 /* EnumDeclaration */ && isConst(node);
     }
     ts.isConstEnumDeclaration = isConstEnumDeclaration;
     function isConst(node) {
-        return !!(ts.getCombinedNodeFlags(node) & 2)
-            || !!(ts.getCombinedModifierFlags(node) & 2048);
+        return !!(ts.getCombinedNodeFlags(node) & 2 /* Const */)
+            || !!(ts.getCombinedModifierFlags(node) & 2048 /* Const */);
     }
     ts.isConst = isConst;
     function isLet(node) {
-        return !!(ts.getCombinedNodeFlags(node) & 1);
+        return !!(ts.getCombinedNodeFlags(node) & 1 /* Let */);
     }
     ts.isLet = isLet;
     function isSuperCall(n) {
-        return n.kind === 187 && n.expression.kind === 97;
+        return n.kind === 187 /* CallExpression */ && n.expression.kind === 97 /* SuperKeyword */;
     }
     ts.isSuperCall = isSuperCall;
     function isImportCall(n) {
-        return n.kind === 187 && n.expression.kind === 91;
+        return n.kind === 187 /* CallExpression */ && n.expression.kind === 91 /* ImportKeyword */;
     }
     ts.isImportCall = isImportCall;
     function isLiteralImportTypeNode(n) {
-        return n.kind === 179 &&
-            n.argument.kind === 178 &&
+        return n.kind === 179 /* ImportType */ &&
+            n.argument.kind === 178 /* LiteralType */ &&
             ts.isStringLiteral(n.argument.literal);
     }
     ts.isLiteralImportTypeNode = isLiteralImportTypeNode;
     function isPrologueDirective(node) {
-        return node.kind === 216
-            && node.expression.kind === 9;
+        return node.kind === 216 /* ExpressionStatement */
+            && node.expression.kind === 9 /* StringLiteral */;
     }
     ts.isPrologueDirective = isPrologueDirective;
     function getLeadingCommentRangesOfNode(node, sourceFileOfNode) {
-        return node.kind !== 10 ? ts.getLeadingCommentRanges(sourceFileOfNode.text, node.pos) : undefined;
+        return node.kind !== 10 /* JsxText */ ? ts.getLeadingCommentRanges(sourceFileOfNode.text, node.pos) : undefined;
     }
     ts.getLeadingCommentRangesOfNode = getLeadingCommentRangesOfNode;
     function getJSDocCommentRanges(node, text) {
-        var commentRanges = (node.kind === 149 ||
-            node.kind === 148 ||
-            node.kind === 192 ||
-            node.kind === 193 ||
-            node.kind === 191) ?
+        var commentRanges = (node.kind === 149 /* Parameter */ ||
+            node.kind === 148 /* TypeParameter */ ||
+            node.kind === 192 /* FunctionExpression */ ||
+            node.kind === 193 /* ArrowFunction */ ||
+            node.kind === 191 /* ParenthesizedExpression */) ?
             ts.concatenate(ts.getTrailingCommentRanges(text, node.pos), ts.getLeadingCommentRanges(text, node.pos)) :
             ts.getLeadingCommentRanges(text, node.pos);
+        // True if the comment starts with '/**' but not if it is '/**/'
         return ts.filter(commentRanges, function (comment) {
-            return text.charCodeAt(comment.pos + 1) === 42 &&
-                text.charCodeAt(comment.pos + 2) === 42 &&
-                text.charCodeAt(comment.pos + 3) !== 47;
+            return text.charCodeAt(comment.pos + 1) === 42 /* asterisk */ &&
+                text.charCodeAt(comment.pos + 2) === 42 /* asterisk */ &&
+                text.charCodeAt(comment.pos + 3) !== 47 /* slash */;
         });
     }
     ts.getJSDocCommentRanges = getJSDocCommentRanges;
@@ -5417,75 +8339,87 @@ var ts;
     ts.fullTripleSlashAMDReferencePathRegEx = /^(\/\/\/\s*<amd-dependency\s+path\s*=\s*)('|")(.+?)\2.*?\/>/;
     var defaultLibReferenceRegEx = /^(\/\/\/\s*<reference\s+no-default-lib\s*=\s*)('|")(.+?)\2\s*\/>/;
     function isPartOfTypeNode(node) {
-        if (161 <= node.kind && node.kind <= 179) {
+        if (161 /* FirstTypeNode */ <= node.kind && node.kind <= 179 /* LastTypeNode */) {
             return true;
         }
         switch (node.kind) {
-            case 119:
-            case 142:
-            case 134:
-            case 137:
-            case 122:
-            case 138:
-            case 140:
-            case 131:
+            case 119 /* AnyKeyword */:
+            case 142 /* UnknownKeyword */:
+            case 134 /* NumberKeyword */:
+            case 137 /* StringKeyword */:
+            case 122 /* BooleanKeyword */:
+            case 138 /* SymbolKeyword */:
+            case 140 /* UndefinedKeyword */:
+            case 131 /* NeverKeyword */:
                 return true;
-            case 105:
-                return node.parent.kind !== 196;
-            case 207:
+            case 105 /* VoidKeyword */:
+                return node.parent.kind !== 196 /* VoidExpression */;
+            case 207 /* ExpressionWithTypeArguments */:
                 return !isExpressionWithTypeArgumentsInClassExtendsClause(node);
-            case 148:
-                return node.parent.kind === 177 || node.parent.kind === 172;
-            case 71:
-                if (node.parent.kind === 146 && node.parent.right === node) {
+            case 148 /* TypeParameter */:
+                return node.parent.kind === 177 /* MappedType */ || node.parent.kind === 172 /* InferType */;
+            // Identifiers and qualified names may be type nodes, depending on their context. Climb
+            // above them to find the lowest container
+            case 71 /* Identifier */:
+                // If the identifier is the RHS of a qualified name, then it's a type iff its parent is.
+                if (node.parent.kind === 146 /* QualifiedName */ && node.parent.right === node) {
                     node = node.parent;
                 }
-                else if (node.parent.kind === 185 && node.parent.name === node) {
+                else if (node.parent.kind === 185 /* PropertyAccessExpression */ && node.parent.name === node) {
                     node = node.parent;
                 }
-                ts.Debug.assert(node.kind === 71 || node.kind === 146 || node.kind === 185, "'node' was expected to be a qualified name, identifier or property access in 'isPartOfTypeNode'.");
-            case 146:
-            case 185:
-            case 99: {
+                // At this point, node is either a qualified name or an identifier
+                ts.Debug.assert(node.kind === 71 /* Identifier */ || node.kind === 146 /* QualifiedName */ || node.kind === 185 /* PropertyAccessExpression */, "'node' was expected to be a qualified name, identifier or property access in 'isPartOfTypeNode'.");
+            // falls through
+            case 146 /* QualifiedName */:
+            case 185 /* PropertyAccessExpression */:
+            case 99 /* ThisKeyword */: {
                 var parent = node.parent;
-                if (parent.kind === 165) {
+                if (parent.kind === 165 /* TypeQuery */) {
                     return false;
                 }
-                if (parent.kind === 179) {
+                if (parent.kind === 179 /* ImportType */) {
                     return !parent.isTypeOf;
                 }
-                if (161 <= parent.kind && parent.kind <= 179) {
+                // Do not recursively call isPartOfTypeNode on the parent. In the example:
+                //
+                //     let a: A.B.C;
+                //
+                // Calling isPartOfTypeNode would consider the qualified name A.B a type node.
+                // Only C and A.B.C are type nodes.
+                if (161 /* FirstTypeNode */ <= parent.kind && parent.kind <= 179 /* LastTypeNode */) {
                     return true;
                 }
                 switch (parent.kind) {
-                    case 207:
+                    case 207 /* ExpressionWithTypeArguments */:
                         return !isExpressionWithTypeArgumentsInClassExtendsClause(parent);
-                    case 148:
+                    case 148 /* TypeParameter */:
                         return node === parent.constraint;
-                    case 152:
-                    case 151:
-                    case 149:
-                    case 232:
+                    case 152 /* PropertyDeclaration */:
+                    case 151 /* PropertySignature */:
+                    case 149 /* Parameter */:
+                    case 232 /* VariableDeclaration */:
                         return node === parent.type;
-                    case 234:
-                    case 192:
-                    case 193:
-                    case 155:
-                    case 154:
-                    case 153:
-                    case 156:
-                    case 157:
+                    case 234 /* FunctionDeclaration */:
+                    case 192 /* FunctionExpression */:
+                    case 193 /* ArrowFunction */:
+                    case 155 /* Constructor */:
+                    case 154 /* MethodDeclaration */:
+                    case 153 /* MethodSignature */:
+                    case 156 /* GetAccessor */:
+                    case 157 /* SetAccessor */:
                         return node === parent.type;
-                    case 158:
-                    case 159:
-                    case 160:
+                    case 158 /* CallSignature */:
+                    case 159 /* ConstructSignature */:
+                    case 160 /* IndexSignature */:
                         return node === parent.type;
-                    case 190:
+                    case 190 /* TypeAssertionExpression */:
                         return node === parent.type;
-                    case 187:
-                    case 188:
+                    case 187 /* CallExpression */:
+                    case 188 /* NewExpression */:
                         return ts.contains(parent.typeArguments, node);
-                    case 189:
+                    case 189 /* TaggedTemplateExpression */:
+                        // TODO (drosen): TaggedTemplateExpressions may eventually support type arguments.
                         return false;
                 }
             }
@@ -5503,27 +8437,29 @@ var ts;
         return false;
     }
     ts.isChildOfNodeWithKind = isChildOfNodeWithKind;
+    // Warning: This has the same semantics as the forEach family of functions,
+    //          in that traversal terminates in the event that 'visitor' supplies a truthy value.
     function forEachReturnStatement(body, visitor) {
         return traverse(body);
         function traverse(node) {
             switch (node.kind) {
-                case 225:
+                case 225 /* ReturnStatement */:
                     return visitor(node);
-                case 241:
-                case 213:
-                case 217:
-                case 218:
-                case 219:
-                case 220:
-                case 221:
-                case 222:
-                case 226:
-                case 227:
-                case 266:
-                case 267:
-                case 228:
-                case 230:
-                case 269:
+                case 241 /* CaseBlock */:
+                case 213 /* Block */:
+                case 217 /* IfStatement */:
+                case 218 /* DoStatement */:
+                case 219 /* WhileStatement */:
+                case 220 /* ForStatement */:
+                case 221 /* ForInStatement */:
+                case 222 /* ForOfStatement */:
+                case 226 /* WithStatement */:
+                case 227 /* SwitchStatement */:
+                case 266 /* CaseClause */:
+                case 267 /* DefaultClause */:
+                case 228 /* LabeledStatement */:
+                case 230 /* TryStatement */:
+                case 269 /* CatchClause */:
                     return ts.forEachChild(node, traverse);
             }
         }
@@ -5533,39 +8469,52 @@ var ts;
         return traverse(body);
         function traverse(node) {
             switch (node.kind) {
-                case 203:
+                case 203 /* YieldExpression */:
                     visitor(node);
                     var operand = node.expression;
                     if (operand) {
                         traverse(operand);
                     }
                     return;
-                case 238:
-                case 236:
-                case 239:
-                case 237:
-                case 235:
-                case 205:
+                case 238 /* EnumDeclaration */:
+                case 236 /* InterfaceDeclaration */:
+                case 239 /* ModuleDeclaration */:
+                case 237 /* TypeAliasDeclaration */:
+                case 235 /* ClassDeclaration */:
+                case 205 /* ClassExpression */:
+                    // These are not allowed inside a generator now, but eventually they may be allowed
+                    // as local types. Regardless, any yield statements contained within them should be
+                    // skipped in this traversal.
                     return;
                 default:
                     if (ts.isFunctionLike(node)) {
-                        if (node.name && node.name.kind === 147) {
+                        if (node.name && node.name.kind === 147 /* ComputedPropertyName */) {
+                            // Note that we will not include methods/accessors of a class because they would require
+                            // first descending into the class. This is by design.
                             traverse(node.name.expression);
                             return;
                         }
                     }
                     else if (!isPartOfTypeNode(node)) {
+                        // This is the general case, which should include mostly expressions and statements.
+                        // Also includes NodeArrays.
                         ts.forEachChild(node, traverse);
                     }
             }
         }
     }
     ts.forEachYieldExpression = forEachYieldExpression;
+    /**
+     * Gets the most likely element type for a TypeNode. This is not an exhaustive test
+     * as it assumes a rest argument can only be an array type (either T[], or Array<T>).
+     *
+     * @param node The type node.
+     */
     function getRestParameterElementType(node) {
-        if (node && node.kind === 167) {
+        if (node && node.kind === 167 /* ArrayType */) {
             return node.elementType;
         }
-        else if (node && node.kind === 162) {
+        else if (node && node.kind === 162 /* TypeReference */) {
             return ts.singleOrUndefined(node.typeArguments);
         }
         else {
@@ -5575,12 +8524,12 @@ var ts;
     ts.getRestParameterElementType = getRestParameterElementType;
     function getMembersOfDeclaration(node) {
         switch (node.kind) {
-            case 236:
-            case 235:
-            case 205:
-            case 166:
+            case 236 /* InterfaceDeclaration */:
+            case 235 /* ClassDeclaration */:
+            case 205 /* ClassExpression */:
+            case 166 /* TypeLiteral */:
                 return node.members;
-            case 184:
+            case 184 /* ObjectLiteralExpression */:
                 return node.properties;
         }
     }
@@ -5588,14 +8537,14 @@ var ts;
     function isVariableLike(node) {
         if (node) {
             switch (node.kind) {
-                case 182:
-                case 273:
-                case 149:
-                case 270:
-                case 152:
-                case 151:
-                case 271:
-                case 232:
+                case 182 /* BindingElement */:
+                case 273 /* EnumMember */:
+                case 149 /* Parameter */:
+                case 270 /* PropertyAssignment */:
+                case 152 /* PropertyDeclaration */:
+                case 151 /* PropertySignature */:
+                case 271 /* ShorthandPropertyAssignment */:
+                case 232 /* VariableDeclaration */:
                     return true;
             }
         }
@@ -5607,8 +8556,8 @@ var ts;
     }
     ts.isVariableLikeOrAccessor = isVariableLikeOrAccessor;
     function isVariableDeclarationInVariableStatement(node) {
-        return node.parent.kind === 233
-            && node.parent.parent.kind === 214;
+        return node.parent.kind === 233 /* VariableDeclarationList */
+            && node.parent.parent.kind === 214 /* VariableStatement */;
     }
     ts.isVariableDeclarationInVariableStatement = isVariableDeclarationInVariableStatement;
     function isValidESSymbolDeclaration(node) {
@@ -5619,13 +8568,13 @@ var ts;
     ts.isValidESSymbolDeclaration = isValidESSymbolDeclaration;
     function introducesArgumentsExoticObject(node) {
         switch (node.kind) {
-            case 154:
-            case 153:
-            case 155:
-            case 156:
-            case 157:
-            case 234:
-            case 192:
+            case 154 /* MethodDeclaration */:
+            case 153 /* MethodSignature */:
+            case 155 /* Constructor */:
+            case 156 /* GetAccessor */:
+            case 157 /* SetAccessor */:
+            case 234 /* FunctionDeclaration */:
+            case 192 /* FunctionExpression */:
                 return true;
         }
         return false;
@@ -5636,7 +8585,7 @@ var ts;
             if (beforeUnwrapLabelCallback) {
                 beforeUnwrapLabelCallback(node);
             }
-            if (node.statement.kind !== 228) {
+            if (node.statement.kind !== 228 /* LabeledStatement */) {
                 return node.statement;
             }
             node = node.statement;
@@ -5644,30 +8593,30 @@ var ts;
     }
     ts.unwrapInnermostStatementOfLabel = unwrapInnermostStatementOfLabel;
     function isFunctionBlock(node) {
-        return node && node.kind === 213 && ts.isFunctionLike(node.parent);
+        return node && node.kind === 213 /* Block */ && ts.isFunctionLike(node.parent);
     }
     ts.isFunctionBlock = isFunctionBlock;
     function isObjectLiteralMethod(node) {
-        return node && node.kind === 154 && node.parent.kind === 184;
+        return node && node.kind === 154 /* MethodDeclaration */ && node.parent.kind === 184 /* ObjectLiteralExpression */;
     }
     ts.isObjectLiteralMethod = isObjectLiteralMethod;
     function isObjectLiteralOrClassExpressionMethod(node) {
-        return node.kind === 154 &&
-            (node.parent.kind === 184 ||
-                node.parent.kind === 205);
+        return node.kind === 154 /* MethodDeclaration */ &&
+            (node.parent.kind === 184 /* ObjectLiteralExpression */ ||
+                node.parent.kind === 205 /* ClassExpression */);
     }
     ts.isObjectLiteralOrClassExpressionMethod = isObjectLiteralOrClassExpressionMethod;
     function isIdentifierTypePredicate(predicate) {
-        return predicate && predicate.kind === 1;
+        return predicate && predicate.kind === 1 /* Identifier */;
     }
     ts.isIdentifierTypePredicate = isIdentifierTypePredicate;
     function isThisTypePredicate(predicate) {
-        return predicate && predicate.kind === 0;
+        return predicate && predicate.kind === 0 /* This */;
     }
     ts.isThisTypePredicate = isThisTypePredicate;
     function getPropertyAssignment(objectLiteral, key, key2) {
         return objectLiteral.properties.filter(function (property) {
-            if (property.kind === 270) {
+            if (property.kind === 270 /* PropertyAssignment */) {
                 var propName = getTextOfPropertyName(property.name);
                 return key === propName || (!!key2 && key2 === propName);
             }
@@ -5696,72 +8645,95 @@ var ts;
     }
     ts.getTsConfigPropArray = getTsConfigPropArray;
     function getContainingFunction(node) {
-        return ts.findAncestor(node.parent, ts.isFunctionLike);
+        return findAncestor(node.parent, ts.isFunctionLike);
     }
     ts.getContainingFunction = getContainingFunction;
     function getContainingClass(node) {
-        return ts.findAncestor(node.parent, ts.isClassLike);
+        return findAncestor(node.parent, ts.isClassLike);
     }
     ts.getContainingClass = getContainingClass;
     function getThisContainer(node, includeArrowFunctions) {
-        ts.Debug.assert(node.kind !== 274);
+        ts.Debug.assert(node.kind !== 274 /* SourceFile */);
         while (true) {
             node = node.parent;
             if (!node) {
-                return ts.Debug.fail();
+                return ts.Debug.fail(); // If we never pass in a SourceFile, this should be unreachable, since we'll stop when we reach that.
             }
             switch (node.kind) {
-                case 147:
+                case 147 /* ComputedPropertyName */:
+                    // If the grandparent node is an object literal (as opposed to a class),
+                    // then the computed property is not a 'this' container.
+                    // A computed property name in a class needs to be a this container
+                    // so that we can error on it.
                     if (ts.isClassLike(node.parent.parent)) {
                         return node;
                     }
+                    // If this is a computed property, then the parent should not
+                    // make it a this container. The parent might be a property
+                    // in an object literal, like a method or accessor. But in order for
+                    // such a parent to be a this container, the reference must be in
+                    // the *body* of the container.
                     node = node.parent;
                     break;
-                case 150:
-                    if (node.parent.kind === 149 && ts.isClassElement(node.parent.parent)) {
+                case 150 /* Decorator */:
+                    // Decorators are always applied outside of the body of a class or method.
+                    if (node.parent.kind === 149 /* Parameter */ && ts.isClassElement(node.parent.parent)) {
+                        // If the decorator's parent is a Parameter, we resolve the this container from
+                        // the grandparent class declaration.
                         node = node.parent.parent;
                     }
                     else if (ts.isClassElement(node.parent)) {
+                        // If the decorator's parent is a class element, we resolve the 'this' container
+                        // from the parent class declaration.
                         node = node.parent;
                     }
                     break;
-                case 193:
+                case 193 /* ArrowFunction */:
                     if (!includeArrowFunctions) {
                         continue;
                     }
-                case 234:
-                case 192:
-                case 239:
-                case 152:
-                case 151:
-                case 154:
-                case 153:
-                case 155:
-                case 156:
-                case 157:
-                case 158:
-                case 159:
-                case 160:
-                case 238:
-                case 274:
+                // falls through
+                case 234 /* FunctionDeclaration */:
+                case 192 /* FunctionExpression */:
+                case 239 /* ModuleDeclaration */:
+                case 152 /* PropertyDeclaration */:
+                case 151 /* PropertySignature */:
+                case 154 /* MethodDeclaration */:
+                case 153 /* MethodSignature */:
+                case 155 /* Constructor */:
+                case 156 /* GetAccessor */:
+                case 157 /* SetAccessor */:
+                case 158 /* CallSignature */:
+                case 159 /* ConstructSignature */:
+                case 160 /* IndexSignature */:
+                case 238 /* EnumDeclaration */:
+                case 274 /* SourceFile */:
                     return node;
             }
         }
     }
     ts.getThisContainer = getThisContainer;
     function getNewTargetContainer(node) {
-        var container = getThisContainer(node, false);
+        var container = getThisContainer(node, /*includeArrowFunctions*/ false);
         if (container) {
             switch (container.kind) {
-                case 155:
-                case 234:
-                case 192:
+                case 155 /* Constructor */:
+                case 234 /* FunctionDeclaration */:
+                case 192 /* FunctionExpression */:
                     return container;
             }
         }
         return undefined;
     }
     ts.getNewTargetContainer = getNewTargetContainer;
+    /**
+     * Given an super call/property node, returns the closest node where
+     * - a super call/property access is legal in the node and not legal in the parent node the node.
+     *   i.e. super call is legal in constructor but not legal in the class body.
+     * - the container is an arrow function (so caller might need to call getSuperContainer again in case it needs to climb higher)
+     * - a super call/property is definitely illegal in the container (but might be legal in some subnode)
+     *   i.e. super property access is illegal in function declaration but can be legal in the statement list
+     */
     function getSuperContainer(node, stopOnFunctions) {
         while (true) {
             node = node.parent;
@@ -5769,28 +8741,34 @@ var ts;
                 return node;
             }
             switch (node.kind) {
-                case 147:
+                case 147 /* ComputedPropertyName */:
                     node = node.parent;
                     break;
-                case 234:
-                case 192:
-                case 193:
+                case 234 /* FunctionDeclaration */:
+                case 192 /* FunctionExpression */:
+                case 193 /* ArrowFunction */:
                     if (!stopOnFunctions) {
                         continue;
                     }
-                case 152:
-                case 151:
-                case 154:
-                case 153:
-                case 155:
-                case 156:
-                case 157:
+                // falls through
+                case 152 /* PropertyDeclaration */:
+                case 151 /* PropertySignature */:
+                case 154 /* MethodDeclaration */:
+                case 153 /* MethodSignature */:
+                case 155 /* Constructor */:
+                case 156 /* GetAccessor */:
+                case 157 /* SetAccessor */:
                     return node;
-                case 150:
-                    if (node.parent.kind === 149 && ts.isClassElement(node.parent.parent)) {
+                case 150 /* Decorator */:
+                    // Decorators are always applied outside of the body of a class or method.
+                    if (node.parent.kind === 149 /* Parameter */ && ts.isClassElement(node.parent.parent)) {
+                        // If the decorator's parent is a Parameter, we resolve the this container from
+                        // the grandparent class declaration.
                         node = node.parent.parent;
                     }
                     else if (ts.isClassElement(node.parent)) {
+                        // If the decorator's parent is a class element, we resolve the 'this' container
+                        // from the parent class declaration.
                         node = node.parent;
                     }
                     break;
@@ -5799,41 +8777,47 @@ var ts;
     }
     ts.getSuperContainer = getSuperContainer;
     function getImmediatelyInvokedFunctionExpression(func) {
-        if (func.kind === 192 || func.kind === 193) {
+        if (func.kind === 192 /* FunctionExpression */ || func.kind === 193 /* ArrowFunction */) {
             var prev = func;
             var parent = func.parent;
-            while (parent.kind === 191) {
+            while (parent.kind === 191 /* ParenthesizedExpression */) {
                 prev = parent;
                 parent = parent.parent;
             }
-            if (parent.kind === 187 && parent.expression === prev) {
+            if (parent.kind === 187 /* CallExpression */ && parent.expression === prev) {
                 return parent;
             }
         }
     }
     ts.getImmediatelyInvokedFunctionExpression = getImmediatelyInvokedFunctionExpression;
+    /**
+     * Determines whether a node is a property or element access expression for `super`.
+     */
     function isSuperProperty(node) {
         var kind = node.kind;
-        return (kind === 185 || kind === 186)
-            && node.expression.kind === 97;
+        return (kind === 185 /* PropertyAccessExpression */ || kind === 186 /* ElementAccessExpression */)
+            && node.expression.kind === 97 /* SuperKeyword */;
     }
     ts.isSuperProperty = isSuperProperty;
+    /**
+     * Determines whether a node is a property or element access expression for `this`.
+     */
     function isThisProperty(node) {
         var kind = node.kind;
-        return (kind === 185 || kind === 186)
-            && node.expression.kind === 99;
+        return (kind === 185 /* PropertyAccessExpression */ || kind === 186 /* ElementAccessExpression */)
+            && node.expression.kind === 99 /* ThisKeyword */;
     }
     ts.isThisProperty = isThisProperty;
     function getEntityNameFromTypeNode(node) {
         switch (node.kind) {
-            case 162:
+            case 162 /* TypeReference */:
                 return node.typeName;
-            case 207:
+            case 207 /* ExpressionWithTypeArguments */:
                 return isEntityNameExpression(node.expression)
                     ? node.expression
                     : undefined;
-            case 71:
-            case 146:
+            case 71 /* Identifier */:
+            case 146 /* QualifiedName */:
                 return node;
         }
         return undefined;
@@ -5841,10 +8825,10 @@ var ts;
     ts.getEntityNameFromTypeNode = getEntityNameFromTypeNode;
     function getInvokedExpression(node) {
         switch (node.kind) {
-            case 189:
+            case 189 /* TaggedTemplateExpression */:
                 return node.tag;
-            case 257:
-            case 256:
+            case 257 /* JsxOpeningElement */:
+            case 256 /* JsxSelfClosingElement */:
                 return node.tagName;
             default:
                 return node.expression;
@@ -5853,41 +8837,45 @@ var ts;
     ts.getInvokedExpression = getInvokedExpression;
     function nodeCanBeDecorated(node, parent, grandparent) {
         switch (node.kind) {
-            case 235:
+            case 235 /* ClassDeclaration */:
+                // classes are valid targets
                 return true;
-            case 152:
-                return parent.kind === 235;
-            case 156:
-            case 157:
-            case 154:
+            case 152 /* PropertyDeclaration */:
+                // property declarations are valid if their parent is a class declaration.
+                return parent.kind === 235 /* ClassDeclaration */;
+            case 156 /* GetAccessor */:
+            case 157 /* SetAccessor */:
+            case 154 /* MethodDeclaration */:
+                // if this method has a body and its parent is a class declaration, this is a valid target.
                 return node.body !== undefined
-                    && parent.kind === 235;
-            case 149:
+                    && parent.kind === 235 /* ClassDeclaration */;
+            case 149 /* Parameter */:
+                // if the parameter's parent has a body and its grandparent is a class declaration, this is a valid target;
                 return parent.body !== undefined
-                    && (parent.kind === 155
-                        || parent.kind === 154
-                        || parent.kind === 157)
-                    && grandparent.kind === 235;
+                    && (parent.kind === 155 /* Constructor */
+                        || parent.kind === 154 /* MethodDeclaration */
+                        || parent.kind === 157 /* SetAccessor */)
+                    && grandparent.kind === 235 /* ClassDeclaration */;
         }
         return false;
     }
     ts.nodeCanBeDecorated = nodeCanBeDecorated;
     function nodeIsDecorated(node, parent, grandparent) {
         return node.decorators !== undefined
-            && nodeCanBeDecorated(node, parent, grandparent);
+            && nodeCanBeDecorated(node, parent, grandparent); // TODO: GH#18217
     }
     ts.nodeIsDecorated = nodeIsDecorated;
     function nodeOrChildIsDecorated(node, parent, grandparent) {
-        return nodeIsDecorated(node, parent, grandparent) || childIsDecorated(node, parent);
+        return nodeIsDecorated(node, parent, grandparent) || childIsDecorated(node, parent); // TODO: GH#18217
     }
     ts.nodeOrChildIsDecorated = nodeOrChildIsDecorated;
     function childIsDecorated(node, parent) {
         switch (node.kind) {
-            case 235:
-                return ts.some(node.members, function (m) { return nodeOrChildIsDecorated(m, node, parent); });
-            case 154:
-            case 157:
-                return ts.some(node.parameters, function (p) { return nodeIsDecorated(p, node, parent); });
+            case 235 /* ClassDeclaration */:
+                return ts.some(node.members, function (m) { return nodeOrChildIsDecorated(m, node, parent); }); // TODO: GH#18217
+            case 154 /* MethodDeclaration */:
+            case 157 /* SetAccessor */:
+                return ts.some(node.parameters, function (p) { return nodeIsDecorated(p, node, parent); }); // TODO: GH#18217
             default:
                 return false;
         }
@@ -5895,9 +8883,9 @@ var ts;
     ts.childIsDecorated = childIsDecorated;
     function isJSXTagName(node) {
         var parent = node.parent;
-        if (parent.kind === 257 ||
-            parent.kind === 256 ||
-            parent.kind === 258) {
+        if (parent.kind === 257 /* JsxOpeningElement */ ||
+            parent.kind === 256 /* JsxSelfClosingElement */ ||
+            parent.kind === 258 /* JsxClosingElement */) {
             return parent.tagName === node;
         }
         return false;
@@ -5905,55 +8893,56 @@ var ts;
     ts.isJSXTagName = isJSXTagName;
     function isExpressionNode(node) {
         switch (node.kind) {
-            case 97:
-            case 95:
-            case 101:
-            case 86:
-            case 12:
-            case 183:
-            case 184:
-            case 185:
-            case 186:
-            case 187:
-            case 188:
-            case 189:
-            case 208:
-            case 190:
-            case 209:
-            case 191:
-            case 192:
-            case 205:
-            case 193:
-            case 196:
-            case 194:
-            case 195:
-            case 198:
-            case 199:
-            case 200:
-            case 201:
-            case 204:
-            case 202:
-            case 13:
-            case 206:
-            case 255:
-            case 256:
-            case 259:
-            case 203:
-            case 197:
-            case 210:
+            case 97 /* SuperKeyword */:
+            case 95 /* NullKeyword */:
+            case 101 /* TrueKeyword */:
+            case 86 /* FalseKeyword */:
+            case 12 /* RegularExpressionLiteral */:
+            case 183 /* ArrayLiteralExpression */:
+            case 184 /* ObjectLiteralExpression */:
+            case 185 /* PropertyAccessExpression */:
+            case 186 /* ElementAccessExpression */:
+            case 187 /* CallExpression */:
+            case 188 /* NewExpression */:
+            case 189 /* TaggedTemplateExpression */:
+            case 208 /* AsExpression */:
+            case 190 /* TypeAssertionExpression */:
+            case 209 /* NonNullExpression */:
+            case 191 /* ParenthesizedExpression */:
+            case 192 /* FunctionExpression */:
+            case 205 /* ClassExpression */:
+            case 193 /* ArrowFunction */:
+            case 196 /* VoidExpression */:
+            case 194 /* DeleteExpression */:
+            case 195 /* TypeOfExpression */:
+            case 198 /* PrefixUnaryExpression */:
+            case 199 /* PostfixUnaryExpression */:
+            case 200 /* BinaryExpression */:
+            case 201 /* ConditionalExpression */:
+            case 204 /* SpreadElement */:
+            case 202 /* TemplateExpression */:
+            case 13 /* NoSubstitutionTemplateLiteral */:
+            case 206 /* OmittedExpression */:
+            case 255 /* JsxElement */:
+            case 256 /* JsxSelfClosingElement */:
+            case 259 /* JsxFragment */:
+            case 203 /* YieldExpression */:
+            case 197 /* AwaitExpression */:
+            case 210 /* MetaProperty */:
                 return true;
-            case 146:
-                while (node.parent.kind === 146) {
+            case 146 /* QualifiedName */:
+                while (node.parent.kind === 146 /* QualifiedName */) {
                     node = node.parent;
                 }
-                return node.parent.kind === 165 || isJSXTagName(node);
-            case 71:
-                if (node.parent.kind === 165 || isJSXTagName(node)) {
+                return node.parent.kind === 165 /* TypeQuery */ || isJSXTagName(node);
+            case 71 /* Identifier */:
+                if (node.parent.kind === 165 /* TypeQuery */ || isJSXTagName(node)) {
                     return true;
                 }
-            case 8:
-            case 9:
-            case 99:
+            // falls through
+            case 8 /* NumericLiteral */:
+            case 9 /* StringLiteral */:
+            case 99 /* ThisKeyword */:
                 return isInExpressionContext(node);
             default:
                 return false;
@@ -5963,47 +8952,47 @@ var ts;
     function isInExpressionContext(node) {
         var parent = node.parent;
         switch (parent.kind) {
-            case 232:
-            case 149:
-            case 152:
-            case 151:
-            case 273:
-            case 270:
-            case 182:
+            case 232 /* VariableDeclaration */:
+            case 149 /* Parameter */:
+            case 152 /* PropertyDeclaration */:
+            case 151 /* PropertySignature */:
+            case 273 /* EnumMember */:
+            case 270 /* PropertyAssignment */:
+            case 182 /* BindingElement */:
                 return parent.initializer === node;
-            case 216:
-            case 217:
-            case 218:
-            case 219:
-            case 225:
-            case 226:
-            case 227:
-            case 266:
-            case 229:
+            case 216 /* ExpressionStatement */:
+            case 217 /* IfStatement */:
+            case 218 /* DoStatement */:
+            case 219 /* WhileStatement */:
+            case 225 /* ReturnStatement */:
+            case 226 /* WithStatement */:
+            case 227 /* SwitchStatement */:
+            case 266 /* CaseClause */:
+            case 229 /* ThrowStatement */:
                 return parent.expression === node;
-            case 220:
+            case 220 /* ForStatement */:
                 var forStatement = parent;
-                return (forStatement.initializer === node && forStatement.initializer.kind !== 233) ||
+                return (forStatement.initializer === node && forStatement.initializer.kind !== 233 /* VariableDeclarationList */) ||
                     forStatement.condition === node ||
                     forStatement.incrementor === node;
-            case 221:
-            case 222:
+            case 221 /* ForInStatement */:
+            case 222 /* ForOfStatement */:
                 var forInStatement = parent;
-                return (forInStatement.initializer === node && forInStatement.initializer.kind !== 233) ||
+                return (forInStatement.initializer === node && forInStatement.initializer.kind !== 233 /* VariableDeclarationList */) ||
                     forInStatement.expression === node;
-            case 190:
-            case 208:
+            case 190 /* TypeAssertionExpression */:
+            case 208 /* AsExpression */:
                 return node === parent.expression;
-            case 211:
+            case 211 /* TemplateSpan */:
                 return node === parent.expression;
-            case 147:
+            case 147 /* ComputedPropertyName */:
                 return node === parent.expression;
-            case 150:
-            case 265:
-            case 264:
-            case 272:
+            case 150 /* Decorator */:
+            case 265 /* JsxExpression */:
+            case 264 /* JsxSpreadAttribute */:
+            case 272 /* SpreadAssignment */:
                 return true;
-            case 207:
+            case 207 /* ExpressionWithTypeArguments */:
                 return parent.expression === node && isExpressionWithTypeArgumentsInClassExtendsClause(parent);
             default:
                 return isExpressionNode(parent);
@@ -6011,7 +9000,7 @@ var ts;
     }
     ts.isInExpressionContext = isInExpressionContext;
     function isExternalModuleImportEqualsDeclaration(node) {
-        return node.kind === 243 && node.moduleReference.kind === 254;
+        return node.kind === 243 /* ImportEqualsDeclaration */ && node.moduleReference.kind === 254 /* ExternalModuleReference */;
     }
     ts.isExternalModuleImportEqualsDeclaration = isExternalModuleImportEqualsDeclaration;
     function getExternalModuleImportEqualsDeclarationExpression(node) {
@@ -6020,7 +9009,7 @@ var ts;
     }
     ts.getExternalModuleImportEqualsDeclarationExpression = getExternalModuleImportEqualsDeclarationExpression;
     function isInternalModuleImportEqualsDeclaration(node) {
-        return node.kind === 243 && node.moduleReference.kind !== 254;
+        return node.kind === 243 /* ImportEqualsDeclaration */ && node.moduleReference.kind !== 254 /* ExternalModuleReference */;
     }
     ts.isInternalModuleImportEqualsDeclaration = isInternalModuleImportEqualsDeclaration;
     function isSourceFileJavaScript(file) {
@@ -6032,15 +9021,15 @@ var ts;
     }
     ts.isSourceFileNotJavaScript = isSourceFileNotJavaScript;
     function isInJavaScriptFile(node) {
-        return !!node && !!(node.flags & 65536);
+        return !!node && !!(node.flags & 65536 /* JavaScriptFile */);
     }
     ts.isInJavaScriptFile = isInJavaScriptFile;
     function isInJsonFile(node) {
-        return !!node && !!(node.flags & 16777216);
+        return !!node && !!(node.flags & 16777216 /* JsonFile */);
     }
     ts.isInJsonFile = isInJsonFile;
     function isInJSDoc(node) {
-        return !!node && !!(node.flags & 2097152);
+        return !!node && !!(node.flags & 2097152 /* JSDoc */);
     }
     ts.isInJSDoc = isInJSDoc;
     function isJSDocIndexSignature(node) {
@@ -6048,15 +9037,15 @@ var ts;
             ts.isIdentifier(node.typeName) &&
             node.typeName.escapedText === "Object" &&
             node.typeArguments && node.typeArguments.length === 2 &&
-            (node.typeArguments[0].kind === 137 || node.typeArguments[0].kind === 134);
+            (node.typeArguments[0].kind === 137 /* StringKeyword */ || node.typeArguments[0].kind === 134 /* NumberKeyword */);
     }
     ts.isJSDocIndexSignature = isJSDocIndexSignature;
     function isRequireCall(callExpression, checkArgumentIsStringLiteralLike) {
-        if (callExpression.kind !== 187) {
+        if (callExpression.kind !== 187 /* CallExpression */) {
             return false;
         }
         var _a = callExpression, expression = _a.expression, args = _a.arguments;
-        if (expression.kind !== 71 || expression.escapedText !== "require") {
+        if (expression.kind !== 71 /* Identifier */ || expression.escapedText !== "require") {
             return false;
         }
         if (args.length !== 1) {
@@ -6067,11 +9056,11 @@ var ts;
     }
     ts.isRequireCall = isRequireCall;
     function isSingleOrDoubleQuote(charCode) {
-        return charCode === 39 || charCode === 34;
+        return charCode === 39 /* singleQuote */ || charCode === 34 /* doubleQuote */;
     }
     ts.isSingleOrDoubleQuote = isSingleOrDoubleQuote;
     function isStringDoubleQuoted(str, sourceFile) {
-        return getSourceTextOfNodeFromSourceFile(sourceFile, str).charCodeAt(0) === 34;
+        return getSourceTextOfNodeFromSourceFile(sourceFile, str).charCodeAt(0) === 34 /* doubleQuote */;
     }
     ts.isStringDoubleQuoted = isStringDoubleQuoted;
     function getDeclarationOfJSInitializer(node) {
@@ -6084,16 +9073,16 @@ var ts;
             name = node.parent.name;
             decl = node.parent;
         }
-        else if (ts.isBinaryExpression(node.parent) && node.parent.operatorToken.kind === 58 && node.parent.right === node) {
+        else if (ts.isBinaryExpression(node.parent) && node.parent.operatorToken.kind === 58 /* EqualsToken */ && node.parent.right === node) {
             name = node.parent.left;
             decl = name;
         }
-        else if (ts.isBinaryExpression(node.parent) && node.parent.operatorToken.kind === 54) {
+        else if (ts.isBinaryExpression(node.parent) && node.parent.operatorToken.kind === 54 /* BarBarToken */) {
             if (ts.isVariableDeclaration(node.parent.parent) && node.parent.parent.initializer === node.parent) {
                 name = node.parent.parent.name;
                 decl = node.parent.parent;
             }
-            else if (ts.isBinaryExpression(node.parent.parent) && node.parent.parent.operatorToken.kind === 58 && node.parent.parent.right === node.parent) {
+            else if (ts.isBinaryExpression(node.parent.parent) && node.parent.parent.operatorToken.kind === 58 /* EqualsToken */ && node.parent.parent.right === node.parent) {
                 name = node.parent.parent.left;
                 decl = name;
             }
@@ -6107,31 +9096,46 @@ var ts;
         return decl;
     }
     ts.getDeclarationOfJSInitializer = getDeclarationOfJSInitializer;
+    /** Get the initializer, taking into account defaulted Javascript initializers */
     function getEffectiveInitializer(node) {
         if (isInJavaScriptFile(node) && node.initializer &&
-            ts.isBinaryExpression(node.initializer) && node.initializer.operatorToken.kind === 54 &&
+            ts.isBinaryExpression(node.initializer) && node.initializer.operatorToken.kind === 54 /* BarBarToken */ &&
             node.name && isEntityNameExpression(node.name) && isSameEntityName(node.name, node.initializer.left)) {
             return node.initializer.right;
         }
         return node.initializer;
     }
     ts.getEffectiveInitializer = getEffectiveInitializer;
+    /**
+     * Get the assignment 'initializer' -- the righthand side-- when the initializer is container-like (See getJavascriptInitializer).
+     * We treat the right hand side of assignments with container-like initalizers as declarations.
+     */
     function getAssignedJavascriptInitializer(node) {
-        if (node && node.parent && ts.isBinaryExpression(node.parent) && node.parent.operatorToken.kind === 58) {
+        if (node && node.parent && ts.isBinaryExpression(node.parent) && node.parent.operatorToken.kind === 58 /* EqualsToken */) {
             var isPrototypeAssignment = isPrototypeAccess(node.parent.left);
             return getJavascriptInitializer(node.parent.right, isPrototypeAssignment) ||
                 getDefaultedJavascriptInitializer(node.parent.left, node.parent.right, isPrototypeAssignment);
         }
     }
     ts.getAssignedJavascriptInitializer = getAssignedJavascriptInitializer;
+    /**
+     * Recognized Javascript container-like initializers are:
+     * 1. (function() {})() -- IIFEs
+     * 2. function() { } -- Function expressions
+     * 3. class { } -- Class expressions
+     * 4. {} -- Empty object literals
+     * 5. { ... } -- Non-empty object literals, when used to initialize a prototype, like `C.prototype = { m() { } }`
+     *
+     * This function returns the provided initializer, or undefined if it is not valid.
+     */
     function getJavascriptInitializer(initializer, isPrototypeAssignment) {
         if (ts.isCallExpression(initializer)) {
             var e = skipParentheses(initializer.expression);
-            return e.kind === 192 || e.kind === 193 ? initializer : undefined;
+            return e.kind === 192 /* FunctionExpression */ || e.kind === 193 /* ArrowFunction */ ? initializer : undefined;
         }
-        if (initializer.kind === 192 ||
-            initializer.kind === 205 ||
-            initializer.kind === 193) {
+        if (initializer.kind === 192 /* FunctionExpression */ ||
+            initializer.kind === 205 /* ClassExpression */ ||
+            initializer.kind === 193 /* ArrowFunction */) {
             return initializer;
         }
         if (ts.isObjectLiteralExpression(initializer) && (initializer.properties.length === 0 || isPrototypeAssignment)) {
@@ -6139,23 +9143,32 @@ var ts;
         }
     }
     ts.getJavascriptInitializer = getJavascriptInitializer;
+    /**
+     * A defaulted Javascript initializer matches the pattern
+     * `Lhs = Lhs || JavascriptInitializer`
+     * or `var Lhs = Lhs || JavascriptInitializer`
+     *
+     * The second Lhs is required to be the same as the first except that it may be prefixed with
+     * 'window.', 'global.' or 'self.' The second Lhs is otherwise ignored by the binder and checker.
+     */
     function getDefaultedJavascriptInitializer(name, initializer, isPrototypeAssignment) {
-        var e = ts.isBinaryExpression(initializer) && initializer.operatorToken.kind === 54 && getJavascriptInitializer(initializer.right, isPrototypeAssignment);
+        var e = ts.isBinaryExpression(initializer) && initializer.operatorToken.kind === 54 /* BarBarToken */ && getJavascriptInitializer(initializer.right, isPrototypeAssignment);
         if (e && isSameEntityName(name, initializer.left)) {
             return e;
         }
     }
     function isDefaultedJavascriptInitializer(node) {
         var name = ts.isVariableDeclaration(node.parent) ? node.parent.name :
-            ts.isBinaryExpression(node.parent) && node.parent.operatorToken.kind === 58 ? node.parent.left :
+            ts.isBinaryExpression(node.parent) && node.parent.operatorToken.kind === 58 /* EqualsToken */ ? node.parent.left :
                 undefined;
         return name && getJavascriptInitializer(node.right, isPrototypeAccess(name)) && isEntityNameExpression(name) && isSameEntityName(name, node.left);
     }
     ts.isDefaultedJavascriptInitializer = isDefaultedJavascriptInitializer;
+    /** Given a Javascript initializer, return the outer name. That is, the lhs of the assignment or the declaration name. */
     function getOuterNameOfJsInitializer(node) {
         if (ts.isBinaryExpression(node.parent)) {
-            var parent = (node.parent.operatorToken.kind === 54 && ts.isBinaryExpression(node.parent.parent)) ? node.parent.parent : node.parent;
-            if (parent.operatorToken.kind === 58 && ts.isIdentifier(parent.left)) {
+            var parent = (node.parent.operatorToken.kind === 54 /* BarBarToken */ && ts.isBinaryExpression(node.parent.parent)) ? node.parent.parent : node.parent;
+            if (parent.operatorToken.kind === 58 /* EqualsToken */ && ts.isIdentifier(parent.left)) {
                 return parent.left;
             }
         }
@@ -6164,12 +9177,21 @@ var ts;
         }
     }
     ts.getOuterNameOfJsInitializer = getOuterNameOfJsInitializer;
+    /**
+     * Is the 'declared' name the same as the one in the initializer?
+     * @return true for identical entity names, as well as ones where the initializer is prefixed with
+     * 'window', 'self' or 'global'. For example:
+     *
+     * var my = my || {}
+     * var min = window.min || {}
+     * my.app = self.my.app || class { }
+     */
     function isSameEntityName(name, initializer) {
         if (ts.isIdentifier(name) && ts.isIdentifier(initializer)) {
             return name.escapedText === initializer.escapedText;
         }
         if (ts.isIdentifier(name) && ts.isPropertyAccessExpression(initializer)) {
-            return (initializer.expression.kind === 99 ||
+            return (initializer.expression.kind === 99 /* ThisKeyword */ ||
                 ts.isIdentifier(initializer.expression) &&
                     (initializer.expression.escapedText === "window" ||
                         initializer.expression.escapedText === "self" ||
@@ -6182,7 +9204,7 @@ var ts;
         return false;
     }
     function getRightMostAssignedExpression(node) {
-        while (isAssignmentExpression(node, true)) {
+        while (isAssignmentExpression(node, /*excludeCompoundAssignements*/ true)) {
             node = node.right;
         }
         return node;
@@ -6196,25 +9218,30 @@ var ts;
         return ts.isPropertyAccessExpression(node) && ts.isIdentifier(node.expression) && node.expression.escapedText === "module" && node.name.escapedText === "exports";
     }
     ts.isModuleExportsPropertyAccessExpression = isModuleExportsPropertyAccessExpression;
+    /// Given a BinaryExpression, returns SpecialPropertyAssignmentKind for the various kinds of property
+    /// assignments we treat as special in the binder
     function getSpecialPropertyAssignmentKind(expr) {
         if (!isInJavaScriptFile(expr) ||
-            expr.operatorToken.kind !== 58 ||
+            expr.operatorToken.kind !== 58 /* EqualsToken */ ||
             !ts.isPropertyAccessExpression(expr.left)) {
-            return 0;
+            return 0 /* None */;
         }
         var lhs = expr.left;
-        if (lhs.expression.kind === 99) {
-            return 4;
+        if (lhs.expression.kind === 99 /* ThisKeyword */) {
+            return 4 /* ThisProperty */;
         }
         else if (ts.isIdentifier(lhs.expression) && lhs.expression.escapedText === "module" && lhs.name.escapedText === "exports") {
-            return 2;
+            // module.exports = expr
+            return 2 /* ModuleExports */;
         }
         else if (isEntityNameExpression(lhs.expression)) {
             if (lhs.name.escapedText === "prototype" && ts.isObjectLiteralExpression(getInitializerOfBinaryExpression(expr))) {
-                return 6;
+                // F.prototype = { ... }
+                return 6 /* Prototype */;
             }
             else if (isPrototypeAccess(lhs.expression)) {
-                return 3;
+                // F.G....prototype.x = expr
+                return 3 /* PrototypeProperty */;
             }
             var nextToLast = lhs;
             while (ts.isPropertyAccessExpression(nextToLast.expression)) {
@@ -6224,11 +9251,13 @@ var ts;
             var id = nextToLast.expression;
             if (id.escapedText === "exports" ||
                 id.escapedText === "module" && nextToLast.name.escapedText === "exports") {
-                return 1;
+                // exports.name = expr OR module.exports.name = expr
+                return 1 /* ExportsProperty */;
             }
-            return 5;
+            // F.G...x = expr
+            return 5 /* Property */;
         }
-        return 0;
+        return 0 /* None */;
     }
     ts.getSpecialPropertyAssignmentKind = getSpecialPropertyAssignmentKind;
     function getInitializerOfBinaryExpression(expr) {
@@ -6239,12 +9268,12 @@ var ts;
     }
     ts.getInitializerOfBinaryExpression = getInitializerOfBinaryExpression;
     function isPrototypePropertyAssignment(node) {
-        return ts.isBinaryExpression(node) && getSpecialPropertyAssignmentKind(node) === 3;
+        return ts.isBinaryExpression(node) && getSpecialPropertyAssignmentKind(node) === 3 /* PrototypeProperty */;
     }
     ts.isPrototypePropertyAssignment = isPrototypePropertyAssignment;
     function isSpecialPropertyDeclaration(expr) {
         return isInJavaScriptFile(expr) &&
-            expr.parent && expr.parent.kind === 216 &&
+            expr.parent && expr.parent.kind === 216 /* ExpressionStatement */ &&
             !!ts.getJSDocTypeTag(expr.parent);
     }
     ts.isSpecialPropertyDeclaration = isSpecialPropertyDeclaration;
@@ -6254,14 +9283,14 @@ var ts;
     ts.importFromModuleSpecifier = importFromModuleSpecifier;
     function tryGetImportFromModuleSpecifier(node) {
         switch (node.parent.kind) {
-            case 244:
-            case 250:
+            case 244 /* ImportDeclaration */:
+            case 250 /* ExportDeclaration */:
                 return node.parent;
-            case 254:
+            case 254 /* ExternalModuleReference */:
                 return node.parent.parent;
-            case 187:
+            case 187 /* CallExpression */:
                 return node.parent;
-            case 178:
+            case 178 /* LiteralType */:
                 ts.Debug.assert(ts.isStringLiteral(node));
                 return ts.tryCast(node.parent.parent, ts.isImportTypeNode);
             default:
@@ -6271,12 +9300,12 @@ var ts;
     ts.tryGetImportFromModuleSpecifier = tryGetImportFromModuleSpecifier;
     function getExternalModuleName(node) {
         switch (node.kind) {
-            case 244:
-            case 250:
+            case 244 /* ImportDeclaration */:
+            case 250 /* ExportDeclaration */:
                 return node.moduleSpecifier;
-            case 243:
-                return node.moduleReference.kind === 254 ? node.moduleReference.expression : undefined;
-            case 179:
+            case 243 /* ImportEqualsDeclaration */:
+                return node.moduleReference.kind === 254 /* ExternalModuleReference */ ? node.moduleReference.expression : undefined;
+            case 179 /* ImportType */:
                 return isLiteralImportTypeNode(node) ? node.argument.literal : undefined;
             default:
                 return ts.Debug.assertNever(node);
@@ -6285,11 +9314,11 @@ var ts;
     ts.getExternalModuleName = getExternalModuleName;
     function getNamespaceDeclarationNode(node) {
         switch (node.kind) {
-            case 244:
+            case 244 /* ImportDeclaration */:
                 return node.importClause && ts.tryCast(node.importClause.namedBindings, ts.isNamespaceImport);
-            case 243:
+            case 243 /* ImportEqualsDeclaration */:
                 return node;
-            case 250:
+            case 250 /* ExportDeclaration */:
                 return undefined;
             default:
                 return ts.Debug.assertNever(node);
@@ -6297,19 +9326,19 @@ var ts;
     }
     ts.getNamespaceDeclarationNode = getNamespaceDeclarationNode;
     function isDefaultImport(node) {
-        return node.kind === 244 && !!node.importClause && !!node.importClause.name;
+        return node.kind === 244 /* ImportDeclaration */ && !!node.importClause && !!node.importClause.name;
     }
     ts.isDefaultImport = isDefaultImport;
     function hasQuestionToken(node) {
         if (node) {
             switch (node.kind) {
-                case 149:
-                case 154:
-                case 153:
-                case 271:
-                case 270:
-                case 152:
-                case 151:
+                case 149 /* Parameter */:
+                case 154 /* MethodDeclaration */:
+                case 153 /* MethodSignature */:
+                case 271 /* ShorthandPropertyAssignment */:
+                case 270 /* PropertyAssignment */:
+                case 152 /* PropertyDeclaration */:
+                case 151 /* PropertySignature */:
                     return node.questionToken !== undefined;
             }
         }
@@ -6317,14 +9346,14 @@ var ts;
     }
     ts.hasQuestionToken = hasQuestionToken;
     function isJSDocConstructSignature(node) {
-        return node.kind === 284 &&
+        return node.kind === 284 /* JSDocFunctionType */ &&
             node.parameters.length > 0 &&
             node.parameters[0].name &&
             node.parameters[0].name.escapedText === "new";
     }
     ts.isJSDocConstructSignature = isJSDocConstructSignature;
     function isJSDocTypeAlias(node) {
-        return node.kind === 297 || node.kind === 292;
+        return node.kind === 297 /* JSDocTypedefTag */ || node.kind === 292 /* JSDocCallbackTag */;
     }
     ts.isJSDocTypeAlias = isJSDocTypeAlias;
     function isTypeAlias(node) {
@@ -6334,27 +9363,27 @@ var ts;
     function getSourceOfAssignment(node) {
         return ts.isExpressionStatement(node) &&
             node.expression && ts.isBinaryExpression(node.expression) &&
-            node.expression.operatorToken.kind === 58
+            node.expression.operatorToken.kind === 58 /* EqualsToken */
             ? node.expression.right
             : undefined;
     }
     function getSourceOfDefaultedAssignment(node) {
         return ts.isExpressionStatement(node) &&
             ts.isBinaryExpression(node.expression) &&
-            getSpecialPropertyAssignmentKind(node.expression) !== 0 &&
+            getSpecialPropertyAssignmentKind(node.expression) !== 0 /* None */ &&
             ts.isBinaryExpression(node.expression.right) &&
-            node.expression.right.operatorToken.kind === 54
+            node.expression.right.operatorToken.kind === 54 /* BarBarToken */
             ? node.expression.right.right
             : undefined;
     }
     function getSingleInitializerOfVariableStatementOrPropertyDeclaration(node) {
         switch (node.kind) {
-            case 214:
+            case 214 /* VariableStatement */:
                 var v = getSingleVariableOfVariableStatement(node);
                 return v && v.initializer;
-            case 152:
+            case 152 /* PropertyDeclaration */:
                 return node.initializer;
-            case 270:
+            case 270 /* PropertyAssignment */:
                 return node.initializer;
         }
     }
@@ -6364,7 +9393,7 @@ var ts;
     function getNestedModuleDeclaration(node) {
         return ts.isModuleDeclaration(node) &&
             node.body &&
-            node.body.kind === 239
+            node.body.kind === 239 /* ModuleDeclaration */
             ? node.body
             : undefined;
     }
@@ -6376,9 +9405,15 @@ var ts;
             var parent = node.parent;
             if (!parent)
                 return;
-            if (parent.kind === 270 || parent.kind === 152 || getNestedModuleDeclaration(parent)) {
+            if (parent.kind === 270 /* PropertyAssignment */ || parent.kind === 152 /* PropertyDeclaration */ || getNestedModuleDeclaration(parent)) {
                 getJSDocCommentsAndTagsWorker(parent);
             }
+            // Try to recognize this pattern when node is initializer of variable declaration and JSDoc comments are on containing variable statement.
+            // /**
+            //   * @param {number} name
+            //   * @returns {number}
+            //   */
+            // var x = function(name) { return name.length; }
             if (parent.parent && (getSingleVariableOfVariableStatement(parent.parent) === node)) {
                 getJSDocCommentsAndTagsWorker(parent.parent);
             }
@@ -6388,12 +9423,13 @@ var ts;
                     getSourceOfDefaultedAssignment(parent.parent.parent))) {
                 getJSDocCommentsAndTagsWorker(parent.parent.parent);
             }
-            if (ts.isBinaryExpression(node) && node.operatorToken.kind === 58 ||
-                ts.isBinaryExpression(parent) && parent.operatorToken.kind === 58 ||
-                node.kind === 185 && node.parent && node.parent.kind === 216) {
+            if (ts.isBinaryExpression(node) && node.operatorToken.kind === 58 /* EqualsToken */ ||
+                ts.isBinaryExpression(parent) && parent.operatorToken.kind === 58 /* EqualsToken */ ||
+                node.kind === 185 /* PropertyAccessExpression */ && node.parent && node.parent.kind === 216 /* ExpressionStatement */) {
                 getJSDocCommentsAndTagsWorker(parent);
             }
-            if (node.kind === 149) {
+            // Pull parameter comments from declaring function as well
+            if (node.kind === 149 /* Parameter */) {
                 result = ts.addRange(result, ts.getJSDocParameterTags(node));
             }
             if (isVariableLike(node) && ts.hasInitializer(node) && node.initializer !== hostNode && ts.hasJSDocNodes(node.initializer)) {
@@ -6405,6 +9441,7 @@ var ts;
         }
     }
     ts.getJSDocCommentsAndTags = getJSDocCommentsAndTags;
+    /** Does the opposite of `getJSDocParameterTags`: given a JSDoc parameter, finds the parameter corresponding to it. */
     function getParameterSymbolFromJSDoc(node) {
         if (node.symbol) {
             return node.symbol;
@@ -6417,7 +9454,7 @@ var ts;
         if (!decl) {
             return undefined;
         }
-        var parameter = ts.find(decl.parameters, function (p) { return p.name.kind === 71 && p.name.escapedText === name; });
+        var parameter = ts.find(decl.parameters, function (p) { return p.name.kind === 71 /* Identifier */ && p.name.escapedText === name; });
         return parameter && parameter.symbol;
     }
     ts.getParameterSymbolFromJSDoc = getParameterSymbolFromJSDoc;
@@ -6436,7 +9473,7 @@ var ts;
     }
     ts.getHostSignatureFromJSDocHost = getHostSignatureFromJSDocHost;
     function getJSDocHost(node) {
-        return ts.Debug.assertDefined(ts.findAncestor(node.parent, ts.isJSDoc)).parent;
+        return ts.Debug.assertDefined(findAncestor(node.parent, ts.isJSDoc)).parent;
     }
     ts.getJSDocHost = getJSDocHost;
     function getTypeParameterFromJsDoc(node) {
@@ -6452,72 +9489,86 @@ var ts;
     ts.hasRestParameter = hasRestParameter;
     function isRestParameter(node) {
         var type = ts.isJSDocParameterTag(node) ? (node.typeExpression && node.typeExpression.type) : node.type;
-        return node.dotDotDotToken !== undefined || !!type && type.kind === 285;
+        return node.dotDotDotToken !== undefined || !!type && type.kind === 285 /* JSDocVariadicType */;
     }
     ts.isRestParameter = isRestParameter;
+    var AssignmentKind;
+    (function (AssignmentKind) {
+        AssignmentKind[AssignmentKind["None"] = 0] = "None";
+        AssignmentKind[AssignmentKind["Definite"] = 1] = "Definite";
+        AssignmentKind[AssignmentKind["Compound"] = 2] = "Compound";
+    })(AssignmentKind = ts.AssignmentKind || (ts.AssignmentKind = {}));
     function getAssignmentTargetKind(node) {
         var parent = node.parent;
         while (true) {
             switch (parent.kind) {
-                case 200:
+                case 200 /* BinaryExpression */:
                     var binaryOperator = parent.operatorToken.kind;
                     return isAssignmentOperator(binaryOperator) && parent.left === node ?
-                        binaryOperator === 58 ? 1 : 2 :
-                        0;
-                case 198:
-                case 199:
+                        binaryOperator === 58 /* EqualsToken */ ? 1 /* Definite */ : 2 /* Compound */ :
+                        0 /* None */;
+                case 198 /* PrefixUnaryExpression */:
+                case 199 /* PostfixUnaryExpression */:
                     var unaryOperator = parent.operator;
-                    return unaryOperator === 43 || unaryOperator === 44 ? 2 : 0;
-                case 221:
-                case 222:
-                    return parent.initializer === node ? 1 : 0;
-                case 191:
-                case 183:
-                case 204:
-                case 209:
+                    return unaryOperator === 43 /* PlusPlusToken */ || unaryOperator === 44 /* MinusMinusToken */ ? 2 /* Compound */ : 0 /* None */;
+                case 221 /* ForInStatement */:
+                case 222 /* ForOfStatement */:
+                    return parent.initializer === node ? 1 /* Definite */ : 0 /* None */;
+                case 191 /* ParenthesizedExpression */:
+                case 183 /* ArrayLiteralExpression */:
+                case 204 /* SpreadElement */:
+                case 209 /* NonNullExpression */:
                     node = parent;
                     break;
-                case 271:
+                case 271 /* ShorthandPropertyAssignment */:
                     if (parent.name !== node) {
-                        return 0;
+                        return 0 /* None */;
                     }
                     node = parent.parent;
                     break;
-                case 270:
+                case 270 /* PropertyAssignment */:
                     if (parent.name === node) {
-                        return 0;
+                        return 0 /* None */;
                     }
                     node = parent.parent;
                     break;
                 default:
-                    return 0;
+                    return 0 /* None */;
             }
             parent = node.parent;
         }
     }
     ts.getAssignmentTargetKind = getAssignmentTargetKind;
+    // A node is an assignment target if it is on the left hand side of an '=' token, if it is parented by a property
+    // assignment in an object literal that is an assignment target, or if it is parented by an array literal that is
+    // an assignment target. Examples include 'a = xxx', '{ p: a } = xxx', '[{ a }] = xxx'.
+    // (Note that `p` is not a target in the above examples, only `a`.)
     function isAssignmentTarget(node) {
-        return getAssignmentTargetKind(node) !== 0;
+        return getAssignmentTargetKind(node) !== 0 /* None */;
     }
     ts.isAssignmentTarget = isAssignmentTarget;
+    /**
+     * Indicates whether a node could contain a `var` VariableDeclarationList that contributes to
+     * the same `var` declaration scope as the node's parent.
+     */
     function isNodeWithPossibleHoistedDeclaration(node) {
         switch (node.kind) {
-            case 213:
-            case 214:
-            case 226:
-            case 217:
-            case 227:
-            case 241:
-            case 266:
-            case 267:
-            case 228:
-            case 220:
-            case 221:
-            case 222:
-            case 218:
-            case 219:
-            case 230:
-            case 269:
+            case 213 /* Block */:
+            case 214 /* VariableStatement */:
+            case 226 /* WithStatement */:
+            case 217 /* IfStatement */:
+            case 227 /* SwitchStatement */:
+            case 241 /* CaseBlock */:
+            case 266 /* CaseClause */:
+            case 267 /* DefaultClause */:
+            case 228 /* LabeledStatement */:
+            case 220 /* ForStatement */:
+            case 221 /* ForInStatement */:
+            case 222 /* ForOfStatement */:
+            case 218 /* DoStatement */:
+            case 219 /* WhileStatement */:
+            case 230 /* TryStatement */:
+            case 269 /* CatchClause */:
                 return true;
         }
         return false;
@@ -6534,26 +9585,27 @@ var ts;
         return node;
     }
     function walkUpParenthesizedTypes(node) {
-        return walkUp(node, 173);
+        return walkUp(node, 173 /* ParenthesizedType */);
     }
     ts.walkUpParenthesizedTypes = walkUpParenthesizedTypes;
     function walkUpParenthesizedExpressions(node) {
-        return walkUp(node, 191);
+        return walkUp(node, 191 /* ParenthesizedExpression */);
     }
     ts.walkUpParenthesizedExpressions = walkUpParenthesizedExpressions;
     function skipParentheses(node) {
-        while (node.kind === 191) {
+        while (node.kind === 191 /* ParenthesizedExpression */) {
             node = node.expression;
         }
         return node;
     }
     ts.skipParentheses = skipParentheses;
+    // a node is delete target iff. it is PropertyAccessExpression/ElementAccessExpression with parentheses skipped
     function isDeleteTarget(node) {
-        if (node.kind !== 185 && node.kind !== 186) {
+        if (node.kind !== 185 /* PropertyAccessExpression */ && node.kind !== 186 /* ElementAccessExpression */) {
             return false;
         }
         node = walkUpParenthesizedExpressions(node.parent);
-        return node && node.kind === 194;
+        return node && node.kind === 194 /* DeleteExpression */;
     }
     ts.isDeleteTarget = isDeleteTarget;
     function isNodeDescendantOf(node, ancestor) {
@@ -6565,15 +9617,17 @@ var ts;
         return false;
     }
     ts.isNodeDescendantOf = isNodeDescendantOf;
+    // True if `name` is the name of a declaration node
     function isDeclarationName(name) {
         return !ts.isSourceFile(name) && !ts.isBindingPattern(name) && ts.isDeclaration(name.parent) && name.parent.name === name;
     }
     ts.isDeclarationName = isDeclarationName;
+    // See GH#16030
     function isAnyDeclarationName(name) {
         switch (name.kind) {
-            case 71:
-            case 9:
-            case 8: {
+            case 71 /* Identifier */:
+            case 9 /* StringLiteral */:
+            case 8 /* NumericLiteral */: {
                 var parent = name.parent;
                 if (ts.isDeclaration(parent)) {
                     return parent.name === name;
@@ -6584,7 +9638,7 @@ var ts;
                 }
                 else {
                     var binExp = name.parent.parent;
-                    return ts.isBinaryExpression(binExp) && getSpecialPropertyAssignmentKind(binExp) !== 0 && ts.getNameOfDeclaration(binExp) === name;
+                    return ts.isBinaryExpression(binExp) && getSpecialPropertyAssignmentKind(binExp) !== 0 /* None */ && ts.getNameOfDeclaration(binExp) === name;
                 }
             }
             default:
@@ -6593,51 +9647,64 @@ var ts;
     }
     ts.isAnyDeclarationName = isAnyDeclarationName;
     function isLiteralComputedPropertyDeclarationName(node) {
-        return (node.kind === 9 || node.kind === 8) &&
-            node.parent.kind === 147 &&
+        return (node.kind === 9 /* StringLiteral */ || node.kind === 8 /* NumericLiteral */) &&
+            node.parent.kind === 147 /* ComputedPropertyName */ &&
             ts.isDeclaration(node.parent.parent);
     }
     ts.isLiteralComputedPropertyDeclarationName = isLiteralComputedPropertyDeclarationName;
+    // Return true if the given identifier is classified as an IdentifierName
     function isIdentifierName(node) {
         var parent = node.parent;
         switch (parent.kind) {
-            case 152:
-            case 151:
-            case 154:
-            case 153:
-            case 156:
-            case 157:
-            case 273:
-            case 270:
-            case 185:
+            case 152 /* PropertyDeclaration */:
+            case 151 /* PropertySignature */:
+            case 154 /* MethodDeclaration */:
+            case 153 /* MethodSignature */:
+            case 156 /* GetAccessor */:
+            case 157 /* SetAccessor */:
+            case 273 /* EnumMember */:
+            case 270 /* PropertyAssignment */:
+            case 185 /* PropertyAccessExpression */:
+                // Name in member declaration or property name in property access
                 return parent.name === node;
-            case 146:
+            case 146 /* QualifiedName */:
+                // Name on right hand side of dot in a type query or type reference
                 if (parent.right === node) {
-                    while (parent.kind === 146) {
+                    while (parent.kind === 146 /* QualifiedName */) {
                         parent = parent.parent;
                     }
-                    return parent.kind === 165 || parent.kind === 162;
+                    return parent.kind === 165 /* TypeQuery */ || parent.kind === 162 /* TypeReference */;
                 }
                 return false;
-            case 182:
-            case 248:
+            case 182 /* BindingElement */:
+            case 248 /* ImportSpecifier */:
+                // Property name in binding element or import specifier
                 return parent.propertyName === node;
-            case 252:
-            case 262:
+            case 252 /* ExportSpecifier */:
+            case 262 /* JsxAttribute */:
+                // Any name in an export specifier or JSX Attribute
                 return true;
         }
         return false;
     }
     ts.isIdentifierName = isIdentifierName;
+    // An alias symbol is created by one of the following declarations:
+    // import <symbol> = ...
+    // import <symbol> from ...
+    // import * as <symbol> from ...
+    // import { x as <symbol> } from ...
+    // export { x as <symbol> } from ...
+    // export = <EntityNameExpression>
+    // export default <EntityNameExpression>
     function isAliasSymbolDeclaration(node) {
-        return node.kind === 243 ||
-            node.kind === 242 ||
-            node.kind === 245 && !!node.name ||
-            node.kind === 246 ||
-            node.kind === 248 ||
-            node.kind === 252 ||
-            node.kind === 249 && exportAssignmentIsAlias(node) ||
-            ts.isBinaryExpression(node) && getSpecialPropertyAssignmentKind(node) === 2;
+        return node.kind === 243 /* ImportEqualsDeclaration */ ||
+            node.kind === 242 /* NamespaceExportDeclaration */ ||
+            node.kind === 245 /* ImportClause */ && !!node.name ||
+            node.kind === 246 /* NamespaceImport */ ||
+            node.kind === 248 /* ImportSpecifier */ ||
+            node.kind === 252 /* ExportSpecifier */ ||
+            node.kind === 249 /* ExportAssignment */ && exportAssignmentIsAlias(node) ||
+            ts.isBinaryExpression(node) && getSpecialPropertyAssignmentKind(node) === 2 /* ModuleExports */;
     }
     ts.isAliasSymbolDeclaration = isAliasSymbolDeclaration;
     function exportAssignmentIsAlias(node) {
@@ -6646,15 +9713,16 @@ var ts;
     }
     ts.exportAssignmentIsAlias = exportAssignmentIsAlias;
     function getClassExtendsHeritageClauseElement(node) {
-        var heritageClause = getHeritageClause(node.heritageClauses, 85);
+        var heritageClause = getHeritageClause(node.heritageClauses, 85 /* ExtendsKeyword */);
         return heritageClause && heritageClause.types.length > 0 ? heritageClause.types[0] : undefined;
     }
     ts.getClassExtendsHeritageClauseElement = getClassExtendsHeritageClauseElement;
     function getClassImplementsHeritageClauseElements(node) {
-        var heritageClause = getHeritageClause(node.heritageClauses, 108);
+        var heritageClause = getHeritageClause(node.heritageClauses, 108 /* ImplementsKeyword */);
         return heritageClause ? heritageClause.types : undefined;
     }
     ts.getClassImplementsHeritageClauseElements = getClassImplementsHeritageClauseElements;
+    /** Returns the node in an `extends` or `implements` clause of a class or interface. */
     function getAllSuperTypeNodes(node) {
         return ts.isInterfaceDeclaration(node) ? getInterfaceBaseTypeNodes(node) || ts.emptyArray
             : ts.isClassLike(node) ? ts.concatenate(ts.singleElementArray(getClassExtendsHeritageClauseElement(node)), getClassImplementsHeritageClauseElements(node)) || ts.emptyArray
@@ -6662,7 +9730,7 @@ var ts;
     }
     ts.getAllSuperTypeNodes = getAllSuperTypeNodes;
     function getInterfaceBaseTypeNodes(node) {
-        var heritageClause = getHeritageClause(node.heritageClauses, 85);
+        var heritageClause = getHeritageClause(node.heritageClauses, 85 /* ExtendsKeyword */);
         return heritageClause ? heritageClause.types : undefined;
     }
     ts.getInterfaceBaseTypeNodes = getInterfaceBaseTypeNodes;
@@ -6696,11 +9764,11 @@ var ts;
     }
     ts.getAncestor = getAncestor;
     function isKeyword(token) {
-        return 72 <= token && token <= 145;
+        return 72 /* FirstKeyword */ <= token && token <= 145 /* LastKeyword */;
     }
     ts.isKeyword = isKeyword;
     function isContextualKeyword(token) {
-        return 117 <= token && token <= 145;
+        return 117 /* FirstContextualKeyword */ <= token && token <= 145 /* LastContextualKeyword */;
     }
     ts.isContextualKeyword = isContextualKeyword;
     function isNonContextualKeyword(token) {
@@ -6713,80 +9781,101 @@ var ts;
     }
     ts.isStringANonContextualKeyword = isStringANonContextualKeyword;
     function isTrivia(token) {
-        return 2 <= token && token <= 7;
+        return 2 /* FirstTriviaToken */ <= token && token <= 7 /* LastTriviaToken */;
     }
     ts.isTrivia = isTrivia;
+    var FunctionFlags;
+    (function (FunctionFlags) {
+        FunctionFlags[FunctionFlags["Normal"] = 0] = "Normal";
+        FunctionFlags[FunctionFlags["Generator"] = 1] = "Generator";
+        FunctionFlags[FunctionFlags["Async"] = 2] = "Async";
+        FunctionFlags[FunctionFlags["Invalid"] = 4] = "Invalid";
+        FunctionFlags[FunctionFlags["AsyncGenerator"] = 3] = "AsyncGenerator";
+    })(FunctionFlags = ts.FunctionFlags || (ts.FunctionFlags = {}));
     function getFunctionFlags(node) {
         if (!node) {
-            return 4;
+            return 4 /* Invalid */;
         }
-        var flags = 0;
+        var flags = 0 /* Normal */;
         switch (node.kind) {
-            case 234:
-            case 192:
-            case 154:
+            case 234 /* FunctionDeclaration */:
+            case 192 /* FunctionExpression */:
+            case 154 /* MethodDeclaration */:
                 if (node.asteriskToken) {
-                    flags |= 1;
+                    flags |= 1 /* Generator */;
                 }
-            case 193:
-                if (hasModifier(node, 256)) {
-                    flags |= 2;
+            // falls through
+            case 193 /* ArrowFunction */:
+                if (hasModifier(node, 256 /* Async */)) {
+                    flags |= 2 /* Async */;
                 }
                 break;
         }
         if (!node.body) {
-            flags |= 4;
+            flags |= 4 /* Invalid */;
         }
         return flags;
     }
     ts.getFunctionFlags = getFunctionFlags;
     function isAsyncFunction(node) {
         switch (node.kind) {
-            case 234:
-            case 192:
-            case 193:
-            case 154:
+            case 234 /* FunctionDeclaration */:
+            case 192 /* FunctionExpression */:
+            case 193 /* ArrowFunction */:
+            case 154 /* MethodDeclaration */:
                 return node.body !== undefined
                     && node.asteriskToken === undefined
-                    && hasModifier(node, 256);
+                    && hasModifier(node, 256 /* Async */);
         }
         return false;
     }
     ts.isAsyncFunction = isAsyncFunction;
     function isStringOrNumericLiteral(node) {
         var kind = node.kind;
-        return kind === 9
-            || kind === 8;
+        return kind === 9 /* StringLiteral */
+            || kind === 8 /* NumericLiteral */;
     }
     ts.isStringOrNumericLiteral = isStringOrNumericLiteral;
+    /**
+     * A declaration has a dynamic name if both of the following are true:
+     *   1. The declaration has a computed property name
+     *   2. The computed name is *not* expressed as Symbol.<name>, where name
+     *      is a property of the Symbol constructor that denotes a built in
+     *      Symbol.
+     */
     function hasDynamicName(declaration) {
         var name = ts.getNameOfDeclaration(declaration);
         return !!name && isDynamicName(name);
     }
     ts.hasDynamicName = hasDynamicName;
     function isDynamicName(name) {
-        return name.kind === 147 &&
+        return name.kind === 147 /* ComputedPropertyName */ &&
             !isStringOrNumericLiteral(name.expression) &&
             !isWellKnownSymbolSyntactically(name.expression);
     }
     ts.isDynamicName = isDynamicName;
+    /**
+     * Checks if the expression is of the form:
+     *    Symbol.name
+     * where Symbol is literally the word "Symbol", and name is any identifierName
+     */
     function isWellKnownSymbolSyntactically(node) {
         return ts.isPropertyAccessExpression(node) && isESSymbolIdentifier(node.expression);
     }
     ts.isWellKnownSymbolSyntactically = isWellKnownSymbolSyntactically;
     function getPropertyNameForPropertyNameNode(name) {
-        if (name.kind === 71) {
+        if (name.kind === 71 /* Identifier */) {
             return name.escapedText;
         }
-        if (name.kind === 9 || name.kind === 8) {
+        if (name.kind === 9 /* StringLiteral */ || name.kind === 8 /* NumericLiteral */) {
             return escapeLeadingUnderscores(name.text);
         }
-        if (name.kind === 147) {
+        if (name.kind === 147 /* ComputedPropertyName */) {
             var nameExpression = name.expression;
             if (isWellKnownSymbolSyntactically(nameExpression)) {
                 return getPropertyNameForKnownSymbolName(ts.idText(nameExpression.name));
             }
-            else if (nameExpression.kind === 9 || nameExpression.kind === 8) {
+            else if (nameExpression.kind === 9 /* StringLiteral */ || nameExpression.kind === 8 /* NumericLiteral */) {
                 return escapeLeadingUnderscores(nameExpression.text);
             }
         }
@@ -6795,10 +9884,10 @@ var ts;
     ts.getPropertyNameForPropertyNameNode = getPropertyNameForPropertyNameNode;
     function isPropertyNameLiteral(node) {
         switch (node.kind) {
-            case 71:
-            case 9:
-            case 13:
-            case 8:
+            case 71 /* Identifier */:
+            case 9 /* StringLiteral */:
+            case 13 /* NoSubstitutionTemplateLiteral */:
+            case 8 /* NumericLiteral */:
                 return true;
             default:
                 return false;
@@ -6806,11 +9895,11 @@ var ts;
     }
     ts.isPropertyNameLiteral = isPropertyNameLiteral;
     function getTextOfIdentifierOrLiteral(node) {
-        return node.kind === 71 ? ts.idText(node) : node.text;
+        return node.kind === 71 /* Identifier */ ? ts.idText(node) : node.text;
     }
     ts.getTextOfIdentifierOrLiteral = getTextOfIdentifierOrLiteral;
     function getEscapedTextOfIdentifierOrLiteral(node) {
-        return node.kind === 71 ? node.escapedText : escapeLeadingUnderscores(node.text);
+        return node.kind === 71 /* Identifier */ ? node.escapedText : escapeLeadingUnderscores(node.text);
     }
     ts.getEscapedTextOfIdentifierOrLiteral = getEscapedTextOfIdentifierOrLiteral;
     function getPropertyNameForKnownSymbolName(symbolName) {
@@ -6821,8 +9910,11 @@ var ts;
         return ts.startsWith(symbol.escapedName, "__@");
     }
     ts.isKnownSymbol = isKnownSymbol;
+    /**
+     * Includes the word "Symbol" with unicode escapes
+     */
     function isESSymbolIdentifier(node) {
-        return node.kind === 71 && node.escapedText === "Symbol";
+        return node.kind === 71 /* Identifier */ && node.escapedText === "Symbol";
     }
     ts.isESSymbolIdentifier = isESSymbolIdentifier;
     function isPushOrUnshiftIdentifier(node) {
@@ -6831,11 +9923,11 @@ var ts;
     ts.isPushOrUnshiftIdentifier = isPushOrUnshiftIdentifier;
     function isParameterDeclaration(node) {
         var root = getRootDeclaration(node);
-        return root.kind === 149;
+        return root.kind === 149 /* Parameter */;
     }
     ts.isParameterDeclaration = isParameterDeclaration;
     function getRootDeclaration(node) {
-        while (node.kind === 182) {
+        while (node.kind === 182 /* BindingElement */) {
             node = node.parent.parent;
         }
         return node;
@@ -6843,15 +9935,15 @@ var ts;
     ts.getRootDeclaration = getRootDeclaration;
     function nodeStartsNewLexicalEnvironment(node) {
         var kind = node.kind;
-        return kind === 155
-            || kind === 192
-            || kind === 234
-            || kind === 193
-            || kind === 154
-            || kind === 156
-            || kind === 157
-            || kind === 239
-            || kind === 274;
+        return kind === 155 /* Constructor */
+            || kind === 192 /* FunctionExpression */
+            || kind === 234 /* FunctionDeclaration */
+            || kind === 193 /* ArrowFunction */
+            || kind === 154 /* MethodDeclaration */
+            || kind === 156 /* GetAccessor */
+            || kind === 157 /* SetAccessor */
+            || kind === 239 /* ModuleDeclaration */
+            || kind === 274 /* SourceFile */;
     }
     ts.nodeStartsNewLexicalEnvironment = nodeStartsNewLexicalEnvironment;
     function nodeIsSynthesized(range) {
@@ -6863,57 +9955,62 @@ var ts;
         return ts.getParseTreeNode(sourceFile, ts.isSourceFile) || sourceFile;
     }
     ts.getOriginalSourceFile = getOriginalSourceFile;
+    var Associativity;
+    (function (Associativity) {
+        Associativity[Associativity["Left"] = 0] = "Left";
+        Associativity[Associativity["Right"] = 1] = "Right";
+    })(Associativity = ts.Associativity || (ts.Associativity = {}));
     function getExpressionAssociativity(expression) {
         var operator = getOperator(expression);
-        var hasArguments = expression.kind === 188 && expression.arguments !== undefined;
+        var hasArguments = expression.kind === 188 /* NewExpression */ && expression.arguments !== undefined;
         return getOperatorAssociativity(expression.kind, operator, hasArguments);
     }
     ts.getExpressionAssociativity = getExpressionAssociativity;
     function getOperatorAssociativity(kind, operator, hasArguments) {
         switch (kind) {
-            case 188:
-                return hasArguments ? 0 : 1;
-            case 198:
-            case 195:
-            case 196:
-            case 194:
-            case 197:
-            case 201:
-            case 203:
-                return 1;
-            case 200:
+            case 188 /* NewExpression */:
+                return hasArguments ? 0 /* Left */ : 1 /* Right */;
+            case 198 /* PrefixUnaryExpression */:
+            case 195 /* TypeOfExpression */:
+            case 196 /* VoidExpression */:
+            case 194 /* DeleteExpression */:
+            case 197 /* AwaitExpression */:
+            case 201 /* ConditionalExpression */:
+            case 203 /* YieldExpression */:
+                return 1 /* Right */;
+            case 200 /* BinaryExpression */:
                 switch (operator) {
-                    case 40:
-                    case 58:
-                    case 59:
-                    case 60:
-                    case 62:
-                    case 61:
-                    case 63:
-                    case 64:
-                    case 65:
-                    case 66:
-                    case 67:
-                    case 68:
-                    case 70:
-                    case 69:
-                        return 1;
+                    case 40 /* AsteriskAsteriskToken */:
+                    case 58 /* EqualsToken */:
+                    case 59 /* PlusEqualsToken */:
+                    case 60 /* MinusEqualsToken */:
+                    case 62 /* AsteriskAsteriskEqualsToken */:
+                    case 61 /* AsteriskEqualsToken */:
+                    case 63 /* SlashEqualsToken */:
+                    case 64 /* PercentEqualsToken */:
+                    case 65 /* LessThanLessThanEqualsToken */:
+                    case 66 /* GreaterThanGreaterThanEqualsToken */:
+                    case 67 /* GreaterThanGreaterThanGreaterThanEqualsToken */:
+                    case 68 /* AmpersandEqualsToken */:
+                    case 70 /* CaretEqualsToken */:
+                    case 69 /* BarEqualsToken */:
+                        return 1 /* Right */;
                 }
         }
-        return 0;
+        return 0 /* Left */;
     }
     ts.getOperatorAssociativity = getOperatorAssociativity;
     function getExpressionPrecedence(expression) {
         var operator = getOperator(expression);
-        var hasArguments = expression.kind === 188 && expression.arguments !== undefined;
+        var hasArguments = expression.kind === 188 /* NewExpression */ && expression.arguments !== undefined;
         return getOperatorPrecedence(expression.kind, operator, hasArguments);
     }
     ts.getExpressionPrecedence = getExpressionPrecedence;
     function getOperator(expression) {
-        if (expression.kind === 200) {
+        if (expression.kind === 200 /* BinaryExpression */) {
             return expression.operatorToken.kind;
         }
-        else if (expression.kind === 198 || expression.kind === 199) {
+        else if (expression.kind === 198 /* PrefixUnaryExpression */ || expression.kind === 199 /* PostfixUnaryExpression */) {
             return expression.operator;
         }
         else {
@@ -6923,122 +10020,125 @@ var ts;
     ts.getOperator = getOperator;
     function getOperatorPrecedence(nodeKind, operatorKind, hasArguments) {
         switch (nodeKind) {
-            case 302:
+            case 302 /* CommaListExpression */:
                 return 0;
-            case 204:
+            case 204 /* SpreadElement */:
                 return 1;
-            case 203:
+            case 203 /* YieldExpression */:
                 return 2;
-            case 201:
+            case 201 /* ConditionalExpression */:
                 return 4;
-            case 200:
+            case 200 /* BinaryExpression */:
                 switch (operatorKind) {
-                    case 26:
+                    case 26 /* CommaToken */:
                         return 0;
-                    case 58:
-                    case 59:
-                    case 60:
-                    case 62:
-                    case 61:
-                    case 63:
-                    case 64:
-                    case 65:
-                    case 66:
-                    case 67:
-                    case 68:
-                    case 70:
-                    case 69:
+                    case 58 /* EqualsToken */:
+                    case 59 /* PlusEqualsToken */:
+                    case 60 /* MinusEqualsToken */:
+                    case 62 /* AsteriskAsteriskEqualsToken */:
+                    case 61 /* AsteriskEqualsToken */:
+                    case 63 /* SlashEqualsToken */:
+                    case 64 /* PercentEqualsToken */:
+                    case 65 /* LessThanLessThanEqualsToken */:
+                    case 66 /* GreaterThanGreaterThanEqualsToken */:
+                    case 67 /* GreaterThanGreaterThanGreaterThanEqualsToken */:
+                    case 68 /* AmpersandEqualsToken */:
+                    case 70 /* CaretEqualsToken */:
+                    case 69 /* BarEqualsToken */:
                         return 3;
                     default:
                         return getBinaryOperatorPrecedence(operatorKind);
                 }
-            case 198:
-            case 195:
-            case 196:
-            case 194:
-            case 197:
+            case 198 /* PrefixUnaryExpression */:
+            case 195 /* TypeOfExpression */:
+            case 196 /* VoidExpression */:
+            case 194 /* DeleteExpression */:
+            case 197 /* AwaitExpression */:
                 return 16;
-            case 199:
+            case 199 /* PostfixUnaryExpression */:
                 return 17;
-            case 187:
+            case 187 /* CallExpression */:
                 return 18;
-            case 188:
+            case 188 /* NewExpression */:
                 return hasArguments ? 19 : 18;
-            case 189:
-            case 185:
-            case 186:
+            case 189 /* TaggedTemplateExpression */:
+            case 185 /* PropertyAccessExpression */:
+            case 186 /* ElementAccessExpression */:
                 return 19;
-            case 99:
-            case 97:
-            case 71:
-            case 95:
-            case 101:
-            case 86:
-            case 8:
-            case 9:
-            case 183:
-            case 184:
-            case 192:
-            case 193:
-            case 205:
-            case 255:
-            case 256:
-            case 259:
-            case 12:
-            case 13:
-            case 202:
-            case 191:
-            case 206:
+            case 99 /* ThisKeyword */:
+            case 97 /* SuperKeyword */:
+            case 71 /* Identifier */:
+            case 95 /* NullKeyword */:
+            case 101 /* TrueKeyword */:
+            case 86 /* FalseKeyword */:
+            case 8 /* NumericLiteral */:
+            case 9 /* StringLiteral */:
+            case 183 /* ArrayLiteralExpression */:
+            case 184 /* ObjectLiteralExpression */:
+            case 192 /* FunctionExpression */:
+            case 193 /* ArrowFunction */:
+            case 205 /* ClassExpression */:
+            case 255 /* JsxElement */:
+            case 256 /* JsxSelfClosingElement */:
+            case 259 /* JsxFragment */:
+            case 12 /* RegularExpressionLiteral */:
+            case 13 /* NoSubstitutionTemplateLiteral */:
+            case 202 /* TemplateExpression */:
+            case 191 /* ParenthesizedExpression */:
+            case 206 /* OmittedExpression */:
                 return 20;
             default:
                 return -1;
         }
     }
     ts.getOperatorPrecedence = getOperatorPrecedence;
+    /* @internal */
     function getBinaryOperatorPrecedence(kind) {
         switch (kind) {
-            case 54:
+            case 54 /* BarBarToken */:
                 return 5;
-            case 53:
+            case 53 /* AmpersandAmpersandToken */:
                 return 6;
-            case 49:
+            case 49 /* BarToken */:
                 return 7;
-            case 50:
+            case 50 /* CaretToken */:
                 return 8;
-            case 48:
+            case 48 /* AmpersandToken */:
                 return 9;
-            case 32:
-            case 33:
-            case 34:
-            case 35:
+            case 32 /* EqualsEqualsToken */:
+            case 33 /* ExclamationEqualsToken */:
+            case 34 /* EqualsEqualsEqualsToken */:
+            case 35 /* ExclamationEqualsEqualsToken */:
                 return 10;
-            case 27:
-            case 29:
-            case 30:
-            case 31:
-            case 93:
-            case 92:
-            case 118:
+            case 27 /* LessThanToken */:
+            case 29 /* GreaterThanToken */:
+            case 30 /* LessThanEqualsToken */:
+            case 31 /* GreaterThanEqualsToken */:
+            case 93 /* InstanceOfKeyword */:
+            case 92 /* InKeyword */:
+            case 118 /* AsKeyword */:
                 return 11;
-            case 45:
-            case 46:
-            case 47:
+            case 45 /* LessThanLessThanToken */:
+            case 46 /* GreaterThanGreaterThanToken */:
+            case 47 /* GreaterThanGreaterThanGreaterThanToken */:
                 return 12;
-            case 37:
-            case 38:
+            case 37 /* PlusToken */:
+            case 38 /* MinusToken */:
                 return 13;
-            case 39:
-            case 41:
-            case 42:
+            case 39 /* AsteriskToken */:
+            case 41 /* SlashToken */:
+            case 42 /* PercentToken */:
                 return 14;
-            case 40:
+            case 40 /* AsteriskAsteriskToken */:
                 return 15;
         }
+        // -1 is lower than all other precedences.  Returning it will cause binary expression
+        // parsing to stop.
         return -1;
     }
     ts.getBinaryOperatorPrecedence = getBinaryOperatorPrecedence;
     function createDiagnosticCollection() {
-        var nonFileDiagnostics = [];
+        var nonFileDiagnostics = []; // See GH#19873
         var filesWithDiagnostics = [];
         var fileDiagnostics = ts.createMap();
         var hasReadNonFileDiagnostics = false;
@@ -7056,12 +10156,13 @@ var ts;
             if (diagnostic.file) {
                 diagnostics = fileDiagnostics.get(diagnostic.file.fileName);
                 if (!diagnostics) {
-                    diagnostics = [];
+                    diagnostics = []; // See GH#19873
                     fileDiagnostics.set(diagnostic.file.fileName, diagnostics);
                     ts.insertSorted(filesWithDiagnostics, diagnostic.file.fileName, ts.compareStringsCaseSensitive);
                 }
             }
             else {
+                // If we've already read the non-file diagnostics, do not modify the existing array.
                 if (hasReadNonFileDiagnostics) {
                     hasReadNonFileDiagnostics = false;
                     nonFileDiagnostics = nonFileDiagnostics.slice();
@@ -7087,6 +10188,11 @@ var ts;
         }
     }
     ts.createDiagnosticCollection = createDiagnosticCollection;
+    // This consists of the first 19 unprintable ASCII characters, canonical escapes, lineSeparator,
+    // paragraphSeparator, and nextLine. The latter three are just desirable to suppress new lines in
+    // the language service. These characters should be escaped when printing, and if any characters are added,
+    // the map below must be updated. Note that this regexp *does not* include the 'delete' character.
+    // There is no reason for this other than that JSON.stringify does not handle it either.
     var doubleQuoteEscapedCharsRegExp = /[\\\"\u0000-\u001f\t\v\f\b\r\n\u2028\u2029\u0085]/g;
     var singleQuoteEscapedCharsRegExp = /[\\\'\u0000-\u001f\t\v\f\b\r\n\u2028\u2029\u0085]/g;
     var backtickQuoteEscapedCharsRegExp = /[\\\`\u0000-\u001f\t\v\f\b\r\n\u2028\u2029\u0085]/g;
@@ -7103,28 +10209,35 @@ var ts;
         "\`": "\\\`",
         "\u2028": "\\u2028",
         "\u2029": "\\u2029",
-        "\u0085": "\\u0085"
+        "\u0085": "\\u0085" // nextLine
     });
+    /**
+     * Based heavily on the abstract 'Quote'/'QuoteJSONString' operation from ECMA-262 (24.3.2.2),
+     * but augmented for a few select characters (e.g. lineSeparator, paragraphSeparator, nextLine)
+     * Note that this doesn't actually wrap the input in double quotes.
+     */
     function escapeString(s, quoteChar) {
-        var escapedCharsRegExp = quoteChar === 96 ? backtickQuoteEscapedCharsRegExp :
-            quoteChar === 39 ? singleQuoteEscapedCharsRegExp :
+        var escapedCharsRegExp = quoteChar === 96 /* backtick */ ? backtickQuoteEscapedCharsRegExp :
+            quoteChar === 39 /* singleQuote */ ? singleQuoteEscapedCharsRegExp :
                 doubleQuoteEscapedCharsRegExp;
         return s.replace(escapedCharsRegExp, getReplacement);
     }
     ts.escapeString = escapeString;
     function getReplacement(c, offset, input) {
-        if (c.charCodeAt(0) === 0) {
+        if (c.charCodeAt(0) === 0 /* nullCharacter */) {
             var lookAhead = input.charCodeAt(offset + c.length);
-            if (lookAhead >= 48 && lookAhead <= 57) {
+            if (lookAhead >= 48 /* _0 */ && lookAhead <= 57 /* _9 */) {
+                // If the null character is followed by digits, print as a hex escape to prevent the result from parsing as an octal (which is forbidden in strict mode)
                 return "\\x00";
             }
+            // Otherwise, keep printing a literal \0 for the null character
             return "\\0";
         }
         return escapedCharsMap.get(c) || get16BitUnicodeEscapeSequence(c.charCodeAt(0));
     }
     function isIntrinsicJsxName(name) {
         var ch = name.charCodeAt(0);
-        return (ch >= 97 && ch <= 122) || name.indexOf("-") > -1;
+        return (ch >= 97 /* a */ && ch <= 122 /* z */) || name.indexOf("-") > -1;
     }
     ts.isIntrinsicJsxName = isIntrinsicJsxName;
     function get16BitUnicodeEscapeSequence(charCode) {
@@ -7135,6 +10248,8 @@ var ts;
     var nonAsciiCharacters = /[^\u0000-\u007F]/g;
     function escapeNonAsciiString(s, quoteChar) {
         s = escapeString(s, quoteChar);
+        // Replace non-ASCII characters with '\uNNNN' escapes if any exist.
+        // Otherwise just return the original string.
         return nonAsciiCharacters.test(s) ?
             s.replace(nonAsciiCharacters, function (c) { return get16BitUnicodeEscapeSequence(c.charCodeAt(0)); }) :
             s;
@@ -7158,13 +10273,25 @@ var ts;
         var lineStart;
         var lineCount;
         var linePos;
+        function updateLineCountAndPosFor(s) {
+            var lineStartsOfS = ts.computeLineStarts(s);
+            if (lineStartsOfS.length > 1) {
+                lineCount = lineCount + lineStartsOfS.length - 1;
+                linePos = output.length - s.length + ts.last(lineStartsOfS);
+                lineStart = (linePos - output.length) === 0;
+            }
+            else {
+                lineStart = false;
+            }
+        }
         function write(s) {
             if (s && s.length) {
                 if (lineStart) {
-                    output += getIndentString(indent);
+                    s = getIndentString(indent) + s;
                     lineStart = false;
                 }
                 output += s;
+                updateLineCountAndPosFor(s);
             }
         }
         function reset() {
@@ -7176,20 +10303,13 @@ var ts;
         }
         function rawWrite(s) {
             if (s !== undefined) {
-                if (lineStart) {
-                    lineStart = false;
-                }
                 output += s;
+                updateLineCountAndPosFor(s);
             }
         }
         function writeLiteral(s) {
             if (s && s.length) {
                 write(s);
-                var lineStartsOfS = ts.computeLineStarts(s);
-                if (lineStartsOfS.length > 1) {
-                    lineCount = lineCount + lineStartsOfS.length - 1;
-                    linePos = output.length - s.length + ts.last(lineStartsOfS);
-                }
             }
         }
         function writeLine() {
@@ -7201,7 +10321,9 @@ var ts;
             }
         }
         function writeTextOfNode(text, node) {
-            write(getTextOfNodeFromSourceText(text, node));
+            var s = getTextOfNodeFromSourceText(text, node);
+            write(s);
+            updateLineCountAndPosFor(s);
         }
         reset();
         return {
@@ -7246,11 +10368,14 @@ var ts;
         return getResolvedExternalModuleName(host, file);
     }
     ts.getExternalModuleNameFromDeclaration = getExternalModuleNameFromDeclaration;
+    /**
+     * Resolves a local path to a path which is absolute to the base of the emit
+     */
     function getExternalModuleNameFromPath(host, fileName, referencePath) {
         var getCanonicalFileName = function (f) { return host.getCanonicalFileName(f); };
         var dir = ts.toPath(referencePath ? ts.getDirectoryPath(referencePath) : host.getCommonSourceDirectory(), host.getCurrentDirectory(), getCanonicalFileName);
         var filePath = ts.getNormalizedAbsolutePath(fileName, host.getCurrentDirectory());
-        var relativePath = ts.getRelativePathToDirectoryOrUrl(dir, filePath, dir, getCanonicalFileName, false);
+        var relativePath = ts.getRelativePathToDirectoryOrUrl(dir, filePath, dir, getCanonicalFileName, /*isAbsolutePathAnUrl*/ false);
         var extensionless = ts.removeFileExtension(relativePath);
         return referencePath ? ts.ensurePathIsNonModuleName(extensionless) : extensionless;
     }
@@ -7269,19 +10394,29 @@ var ts;
     ts.getOwnEmitOutputFilePath = getOwnEmitOutputFilePath;
     function getDeclarationEmitOutputFilePath(sourceFile, host) {
         var options = host.getCompilerOptions();
-        var outputDir = options.declarationDir || options.outDir;
+        var outputDir = options.declarationDir || options.outDir; // Prefer declaration folder if specified
         var path = outputDir
             ? getSourceFilePathInNewDir(sourceFile, host, outputDir)
             : sourceFile.fileName;
-        return ts.removeFileExtension(path) + ".d.ts";
+        return ts.removeFileExtension(path) + ".d.ts" /* Dts */;
     }
     ts.getDeclarationEmitOutputFilePath = getDeclarationEmitOutputFilePath;
+    /**
+     * Gets the source files that are expected to have an emit output.
+     *
+     * Originally part of `forEachExpectedEmitFile`, this functionality was extracted to support
+     * transformations.
+     *
+     * @param host An EmitHost.
+     * @param targetSourceFile An optional target source file to emit.
+     */
     function getSourceFilesToEmit(host, targetSourceFile) {
         var options = host.getCompilerOptions();
         var isSourceFileFromExternalLibrary = function (file) { return host.isSourceFileFromExternalLibrary(file); };
         if (options.outFile || options.out) {
             var moduleKind = ts.getEmitModuleKind(options);
             var moduleEmitEnabled_1 = moduleKind === ts.ModuleKind.AMD || moduleKind === ts.ModuleKind.System;
+            // Can emit only sources that are not declaration file and are either non module code or module with --module or --target es6 specified
             return ts.filter(host.getSourceFiles(), function (sourceFile) {
                 return (moduleEmitEnabled_1 || !ts.isExternalModule(sourceFile)) && sourceFileMayBeEmitted(sourceFile, options, isSourceFileFromExternalLibrary);
             });
@@ -7292,6 +10427,7 @@ var ts;
         }
     }
     ts.getSourceFilesToEmit = getSourceFilesToEmit;
+    /** Don't call this for `--outFile`, just for `--outDir` or plain emit. `--outFile` needs additional checks. */
     function sourceFileMayBeEmitted(sourceFile, options, isSourceFileFromExternalLibrary) {
         return !(options.noEmitForJsFiles && isSourceFileJavaScript(sourceFile)) && !sourceFile.isDeclarationFile && !isSourceFileFromExternalLibrary(sourceFile);
     }
@@ -7328,12 +10464,14 @@ var ts;
             return accessor.parameters[hasThis ? 1 : 0];
         }
     }
+    /** Get the type annotation for the value parameter. */
     function getSetAccessorTypeAnnotationNode(accessor) {
         var parameter = getSetAccessorValueParameter(accessor);
         return parameter && parameter.type;
     }
     ts.getSetAccessorTypeAnnotationNode = getSetAccessorTypeAnnotationNode;
     function getThisParameter(signature) {
+        // callback tags do not currently support this parameters
         if (signature.parameters.length && !ts.isJSDocSignature(signature)) {
             var thisParameter = signature.parameters[0];
             if (parameterIsThisKeyword(thisParameter)) {
@@ -7347,24 +10485,25 @@ var ts;
     }
     ts.parameterIsThisKeyword = parameterIsThisKeyword;
     function isThisIdentifier(node) {
-        return !!node && node.kind === 71 && identifierIsThisKeyword(node);
+        return !!node && node.kind === 71 /* Identifier */ && identifierIsThisKeyword(node);
     }
     ts.isThisIdentifier = isThisIdentifier;
     function identifierIsThisKeyword(id) {
-        return id.originalKeywordKind === 99;
+        return id.originalKeywordKind === 99 /* ThisKeyword */;
     }
     ts.identifierIsThisKeyword = identifierIsThisKeyword;
     function getAllAccessorDeclarations(declarations, accessor) {
+        // TODO: GH#18217
         var firstAccessor;
         var secondAccessor;
         var getAccessor;
         var setAccessor;
         if (hasDynamicName(accessor)) {
             firstAccessor = accessor;
-            if (accessor.kind === 156) {
+            if (accessor.kind === 156 /* GetAccessor */) {
                 getAccessor = accessor;
             }
-            else if (accessor.kind === 157) {
+            else if (accessor.kind === 157 /* SetAccessor */) {
                 setAccessor = accessor;
             }
             else {
@@ -7373,8 +10512,8 @@ var ts;
         }
         else {
             ts.forEach(declarations, function (member) {
-                if ((member.kind === 156 || member.kind === 157)
-                    && hasModifier(member, 32) === hasModifier(accessor, 32)) {
+                if ((member.kind === 156 /* GetAccessor */ || member.kind === 157 /* SetAccessor */)
+                    && hasModifier(member, 32 /* Static */) === hasModifier(accessor, 32 /* Static */)) {
                     var memberName = getPropertyNameForPropertyNameNode(member.name);
                     var accessorName = getPropertyNameForPropertyNameNode(accessor.name);
                     if (memberName === accessorName) {
@@ -7384,10 +10523,10 @@ var ts;
                         else if (!secondAccessor) {
                             secondAccessor = member;
                         }
-                        if (member.kind === 156 && !getAccessor) {
+                        if (member.kind === 156 /* GetAccessor */ && !getAccessor) {
                             getAccessor = member;
                         }
-                        if (member.kind === 157 && !setAccessor) {
+                        if (member.kind === 157 /* SetAccessor */ && !setAccessor) {
                             setAccessor = member;
                         }
                     }
@@ -7402,6 +10541,10 @@ var ts;
         };
     }
     ts.getAllAccessorDeclarations = getAllAccessorDeclarations;
+    /**
+     * Gets the effective type annotation of a variable, parameter, or property. If the node was
+     * parsed in a JavaScript file, gets the type annotation from JSDoc.
+     */
     function getEffectiveTypeAnnotationNode(node) {
         return node.type || (isInJavaScriptFile(node) ? ts.getJSDocType(node) : undefined);
     }
@@ -7410,6 +10553,10 @@ var ts;
         return node.type;
     }
     ts.getTypeAnnotationNode = getTypeAnnotationNode;
+    /**
+     * Gets the effective return type annotation of a signature. If the node was parsed in a
+     * JavaScript file, gets the return type annotation from JSDoc.
+     */
     function getEffectiveReturnTypeNode(node) {
         if (ts.isJSDocSignature(node)) {
             return node.type && node.type.typeExpression && node.type.typeExpression.type;
@@ -7417,12 +10564,16 @@ var ts;
         return node.type || (isInJavaScriptFile(node) ? ts.getJSDocReturnType(node) : undefined);
     }
     ts.getEffectiveReturnTypeNode = getEffectiveReturnTypeNode;
+    /**
+     * Gets the effective type parameters. If the node was parsed in a
+     * JavaScript file, gets the type parameters from the `@template` tag from JSDoc.
+     */
     function getEffectiveTypeParameterDeclarations(node) {
         if (ts.isJSDocSignature(node)) {
             return ts.emptyArray;
         }
         if (isJSDocTypeAlias(node)) {
-            ts.Debug.assert(node.parent.kind === 286);
+            ts.Debug.assert(node.parent.kind === 286 /* JSDocComment */);
             return ts.flatMap(node.parent.tags, function (tag) { return ts.isJSDocTemplateTag(tag) ? tag.typeParameters : undefined; });
         }
         return node.typeParameters || (isInJavaScriptFile(node) ? getJSDocTypeParameterDeclarations(node) : ts.emptyArray);
@@ -7432,9 +10583,14 @@ var ts;
         return ts.flatMap(ts.getJSDocTags(node), function (tag) { return isNonTypeAliasTemplate(tag) ? tag.typeParameters : undefined; });
     }
     ts.getJSDocTypeParameterDeclarations = getJSDocTypeParameterDeclarations;
+    /** template tags are only available when a typedef isn't already using them */
     function isNonTypeAliasTemplate(tag) {
-        return ts.isJSDocTemplateTag(tag) && !(tag.parent.kind === 286 && tag.parent.tags.some(isJSDocTypeAlias));
+        return ts.isJSDocTemplateTag(tag) && !(tag.parent.kind === 286 /* JSDocComment */ && tag.parent.tags.some(isJSDocTypeAlias));
     }
+    /**
+     * Gets the effective type annotation of the value parameter of a set accessor. If the node
+     * was parsed in a JavaScript file, gets the type annotation from JSDoc.
+     */
     function getEffectiveSetAccessorTypeAnnotationNode(node) {
         var parameter = getSetAccessorValueParameter(node);
         return parameter && getEffectiveTypeAnnotationNode(parameter);
@@ -7445,6 +10601,7 @@ var ts;
     }
     ts.emitNewLineBeforeLeadingComments = emitNewLineBeforeLeadingComments;
     function emitNewLineBeforeLeadingCommentsOfPosition(lineMap, writer, pos, leadingComments) {
+        // If the leading comments start on different line than the start of node, write new line
         if (leadingComments && leadingComments.length && pos !== leadingComments[0].pos &&
             getLineOfLocalPositionFromLineMap(lineMap, pos) !== getLineOfLocalPositionFromLineMap(lineMap, leadingComments[0].pos)) {
             writer.writeLine();
@@ -7452,6 +10609,7 @@ var ts;
     }
     ts.emitNewLineBeforeLeadingCommentsOfPosition = emitNewLineBeforeLeadingCommentsOfPosition;
     function emitNewLineBeforeLeadingCommentOfPosition(lineMap, writer, pos, commentPos) {
+        // If the leading comments start on different line than the start of node, write new line
         if (pos !== commentPos &&
             getLineOfLocalPositionFromLineMap(lineMap, pos) !== getLineOfLocalPositionFromLineMap(lineMap, commentPos)) {
             writer.writeLine();
@@ -7484,15 +10642,25 @@ var ts;
         }
     }
     ts.emitComments = emitComments;
+    /**
+     * Detached comment is a comment at the top of file or function body that is separated from
+     * the next statement by space.
+     */
     function emitDetachedComments(text, lineMap, writer, writeComment, node, newLine, removeComments) {
         var leadingComments;
         var currentDetachedCommentInfo;
         if (removeComments) {
+            // removeComments is true, only reserve pinned comment at the top of file
+            // For example:
+            //      /*! Pinned Comment */
+            //
+            //      var x = 10;
             if (node.pos === 0) {
                 leadingComments = ts.filter(ts.getLeadingCommentRanges(text, node.pos), isPinnedCommentLocal);
             }
         }
         else {
+            // removeComments is false, just get detached as normal and bypass the process to filter comment
             leadingComments = ts.getLeadingCommentRanges(text, node.pos);
         }
         if (leadingComments) {
@@ -7504,6 +10672,9 @@ var ts;
                     var lastCommentLine = getLineOfLocalPositionFromLineMap(lineMap, lastComment.end);
                     var commentLine = getLineOfLocalPositionFromLineMap(lineMap, comment.pos);
                     if (commentLine >= lastCommentLine + 2) {
+                        // There was a blank line between the last comment and this comment.  This
+                        // comment is not part of the copyright comments.  Return what we have so
+                        // far.
                         break;
                     }
                 }
@@ -7511,11 +10682,15 @@ var ts;
                 lastComment = comment;
             }
             if (detachedComments.length) {
+                // All comments look like they could have been part of the copyright header.  Make
+                // sure there is at least one blank line between it and the node.  If not, it's not
+                // a copyright header.
                 var lastCommentLine = getLineOfLocalPositionFromLineMap(lineMap, ts.last(detachedComments).end);
                 var nodeLine = getLineOfLocalPositionFromLineMap(lineMap, ts.skipTrivia(text, node.pos));
                 if (nodeLine >= lastCommentLine + 2) {
+                    // Valid detachedComments
                     emitNewLineBeforeLeadingComments(lineMap, writer, node, leadingComments);
-                    emitComments(text, lineMap, writer, detachedComments, false, true, newLine, writeComment);
+                    emitComments(text, lineMap, writer, detachedComments, /*leadingSeparator*/ false, /*trailingSeparator*/ true, newLine, writeComment);
                     currentDetachedCommentInfo = { nodePos: node.pos, detachedCommentEndPos: ts.last(detachedComments).end };
                 }
             }
@@ -7527,7 +10702,7 @@ var ts;
     }
     ts.emitDetachedComments = emitDetachedComments;
     function writeCommentRange(text, lineMap, writer, commentPos, commentEnd, newLine) {
-        if (text.charCodeAt(commentPos + 1) === 42) {
+        if (text.charCodeAt(commentPos + 1) === 42 /* asterisk */) {
             var firstCommentLineAndCharacter = ts.computeLineAndCharacterOfPosition(lineMap, commentPos);
             var lineCount = lineMap.length;
             var firstCommentLineIndent = void 0;
@@ -7536,29 +10711,50 @@ var ts;
                     ? text.length + 1
                     : lineMap[currentLine + 1];
                 if (pos !== commentPos) {
+                    // If we are not emitting first line, we need to write the spaces to adjust the alignment
                     if (firstCommentLineIndent === undefined) {
                         firstCommentLineIndent = calculateIndent(text, lineMap[firstCommentLineAndCharacter.line], commentPos);
                     }
+                    // These are number of spaces writer is going to write at current indent
                     var currentWriterIndentSpacing = writer.getIndent() * getIndentSize();
+                    // Number of spaces we want to be writing
+                    // eg: Assume writer indent
+                    // module m {
+                    //         /* starts at character 9 this is line 1
+                    //    * starts at character pos 4 line                        --1  = 8 - 8 + 3
+                    //   More left indented comment */                            --2  = 8 - 8 + 2
+                    //     class c { }
+                    // }
+                    // module m {
+                    //     /* this is line 1 -- Assume current writer indent 8
+                    //      * line                                                --3 = 8 - 4 + 5
+                    //            More right indented comment */                  --4 = 8 - 4 + 11
+                    //     class c { }
+                    // }
                     var spacesToEmit = currentWriterIndentSpacing - firstCommentLineIndent + calculateIndent(text, pos, nextLineStart);
                     if (spacesToEmit > 0) {
                         var numberOfSingleSpacesToEmit = spacesToEmit % getIndentSize();
                         var indentSizeSpaceString = getIndentString((spacesToEmit - numberOfSingleSpacesToEmit) / getIndentSize());
+                        // Write indent size string ( in eg 1: = "", 2: "" , 3: string with 8 spaces 4: string with 12 spaces
                         writer.rawWrite(indentSizeSpaceString);
+                        // Emit the single spaces (in eg: 1: 3 spaces, 2: 2 spaces, 3: 1 space, 4: 3 spaces)
                         while (numberOfSingleSpacesToEmit) {
                             writer.rawWrite(" ");
                             numberOfSingleSpacesToEmit--;
                         }
                     }
                     else {
+                        // No spaces to emit write empty string
                         writer.rawWrite("");
                     }
                 }
+                // Write the comment line text
                 writeTrimmedCurrentLine(text, commentEnd, writer, newLine, pos, nextLineStart);
                 pos = nextLineStart;
             }
         }
         else {
+            // Single line comment of style //....
             writer.write(text.substring(commentPos, commentEnd));
         }
     }
@@ -7567,29 +10763,33 @@ var ts;
         var end = Math.min(commentEnd, nextLineStart - 1);
         var currentLineText = text.substring(pos, end).replace(/^\s+|\s+$/g, "");
         if (currentLineText) {
+            // trimmed forward and ending spaces text
             writer.write(currentLineText);
             if (end !== commentEnd) {
                 writer.writeLine();
             }
         }
         else {
+            // Empty string - make sure we write empty line
             writer.writeLiteral(newLine);
         }
     }
     function calculateIndent(text, pos, end) {
         var currentLineIndent = 0;
         for (; pos < end && ts.isWhiteSpaceSingleLine(text.charCodeAt(pos)); pos++) {
-            if (text.charCodeAt(pos) === 9) {
+            if (text.charCodeAt(pos) === 9 /* tab */) {
+                // Tabs = TabSize = indent size and go to next tabStop
                 currentLineIndent += getIndentSize() - (currentLineIndent % getIndentSize());
             }
             else {
+                // Single space
                 currentLineIndent++;
             }
         }
         return currentLineIndent;
     }
     function hasModifiers(node) {
-        return getModifierFlags(node) !== 0;
+        return getModifierFlags(node) !== 0 /* None */;
     }
     ts.hasModifiers = hasModifiers;
     function hasModifier(node, flags) {
@@ -7597,11 +10797,11 @@ var ts;
     }
     ts.hasModifier = hasModifier;
     function hasStaticModifier(node) {
-        return hasModifier(node, 32);
+        return hasModifier(node, 32 /* Static */);
     }
     ts.hasStaticModifier = hasStaticModifier;
     function hasReadonlyModifier(node) {
-        return hasModifier(node, 64);
+        return hasModifier(node, 64 /* Readonly */);
     }
     ts.hasReadonlyModifier = hasReadonlyModifier;
     function getSelectedModifierFlags(node, flags) {
@@ -7609,58 +10809,59 @@ var ts;
     }
     ts.getSelectedModifierFlags = getSelectedModifierFlags;
     function getModifierFlags(node) {
-        if (node.modifierFlagsCache & 536870912) {
-            return node.modifierFlagsCache & ~536870912;
+        if (node.modifierFlagsCache & 536870912 /* HasComputedFlags */) {
+            return node.modifierFlagsCache & ~536870912 /* HasComputedFlags */;
         }
         var flags = getModifierFlagsNoCache(node);
-        node.modifierFlagsCache = flags | 536870912;
+        node.modifierFlagsCache = flags | 536870912 /* HasComputedFlags */;
         return flags;
     }
     ts.getModifierFlags = getModifierFlags;
     function getModifierFlagsNoCache(node) {
-        var flags = 0;
+        var flags = 0 /* None */;
         if (node.modifiers) {
             for (var _i = 0, _a = node.modifiers; _i < _a.length; _i++) {
                 var modifier = _a[_i];
                 flags |= modifierToFlag(modifier.kind);
             }
         }
-        if (node.flags & 4 || (node.kind === 71 && node.isInJSDocNamespace)) {
-            flags |= 1;
+        if (node.flags & 4 /* NestedNamespace */ || (node.kind === 71 /* Identifier */ && node.isInJSDocNamespace)) {
+            flags |= 1 /* Export */;
         }
         return flags;
     }
     ts.getModifierFlagsNoCache = getModifierFlagsNoCache;
     function modifierToFlag(token) {
         switch (token) {
-            case 115: return 32;
-            case 114: return 4;
-            case 113: return 16;
-            case 112: return 8;
-            case 117: return 128;
-            case 84: return 1;
-            case 124: return 2;
-            case 76: return 2048;
-            case 79: return 512;
-            case 120: return 256;
-            case 132: return 64;
+            case 115 /* StaticKeyword */: return 32 /* Static */;
+            case 114 /* PublicKeyword */: return 4 /* Public */;
+            case 113 /* ProtectedKeyword */: return 16 /* Protected */;
+            case 112 /* PrivateKeyword */: return 8 /* Private */;
+            case 117 /* AbstractKeyword */: return 128 /* Abstract */;
+            case 84 /* ExportKeyword */: return 1 /* Export */;
+            case 124 /* DeclareKeyword */: return 2 /* Ambient */;
+            case 76 /* ConstKeyword */: return 2048 /* Const */;
+            case 79 /* DefaultKeyword */: return 512 /* Default */;
+            case 120 /* AsyncKeyword */: return 256 /* Async */;
+            case 132 /* ReadonlyKeyword */: return 64 /* Readonly */;
         }
-        return 0;
+        return 0 /* None */;
     }
     ts.modifierToFlag = modifierToFlag;
     function isLogicalOperator(token) {
-        return token === 54
-            || token === 53
-            || token === 51;
+        return token === 54 /* BarBarToken */
+            || token === 53 /* AmpersandAmpersandToken */
+            || token === 51 /* ExclamationToken */;
     }
     ts.isLogicalOperator = isLogicalOperator;
     function isAssignmentOperator(token) {
-        return token >= 58 && token <= 70;
+        return token >= 58 /* FirstAssignment */ && token <= 70 /* LastAssignment */;
     }
     ts.isAssignmentOperator = isAssignmentOperator;
+    /** Get `C` given `N` if `N` is in the position `class C extends N` where `N` is an ExpressionWithTypeArguments. */
     function tryGetClassExtendingExpressionWithTypeArguments(node) {
         if (ts.isExpressionWithTypeArguments(node) &&
-            node.parent.token === 85 &&
+            node.parent.token === 85 /* ExtendsKeyword */ &&
             ts.isClassLike(node.parent.parent)) {
             return node.parent.parent;
         }
@@ -7669,16 +10870,16 @@ var ts;
     function isAssignmentExpression(node, excludeCompoundAssignment) {
         return ts.isBinaryExpression(node)
             && (excludeCompoundAssignment
-                ? node.operatorToken.kind === 58
+                ? node.operatorToken.kind === 58 /* EqualsToken */
                 : isAssignmentOperator(node.operatorToken.kind))
             && ts.isLeftHandSideExpression(node.left);
     }
     ts.isAssignmentExpression = isAssignmentExpression;
     function isDestructuringAssignment(node) {
-        if (isAssignmentExpression(node, true)) {
+        if (isAssignmentExpression(node, /*excludeCompoundAssignment*/ true)) {
             var kind = node.left.kind;
-            return kind === 184
-                || kind === 183;
+            return kind === 184 /* ObjectLiteralExpression */
+                || kind === 183 /* ArrayLiteralExpression */;
         }
         return false;
     }
@@ -7688,16 +10889,16 @@ var ts;
     }
     ts.isExpressionWithTypeArgumentsInClassExtendsClause = isExpressionWithTypeArgumentsInClassExtendsClause;
     function isExpressionWithTypeArgumentsInClassImplementsClause(node) {
-        return node.kind === 207
+        return node.kind === 207 /* ExpressionWithTypeArguments */
             && isEntityNameExpression(node.expression)
             && node.parent
-            && node.parent.token === 108
+            && node.parent.token === 108 /* ImplementsKeyword */
             && node.parent.parent
             && ts.isClassLike(node.parent.parent);
     }
     ts.isExpressionWithTypeArgumentsInClassImplementsClause = isExpressionWithTypeArgumentsInClassImplementsClause;
     function isEntityNameExpression(node) {
-        return node.kind === 71 || isPropertyAccessEntityNameExpression(node);
+        return node.kind === 71 /* Identifier */ || isPropertyAccessEntityNameExpression(node);
     }
     ts.isEntityNameExpression = isEntityNameExpression;
     function isPropertyAccessEntityNameExpression(node) {
@@ -7709,17 +10910,17 @@ var ts;
     }
     ts.isPrototypeAccess = isPrototypeAccess;
     function isRightSideOfQualifiedNameOrPropertyAccess(node) {
-        return (node.parent.kind === 146 && node.parent.right === node) ||
-            (node.parent.kind === 185 && node.parent.name === node);
+        return (node.parent.kind === 146 /* QualifiedName */ && node.parent.right === node) ||
+            (node.parent.kind === 185 /* PropertyAccessExpression */ && node.parent.name === node);
     }
     ts.isRightSideOfQualifiedNameOrPropertyAccess = isRightSideOfQualifiedNameOrPropertyAccess;
     function isEmptyObjectLiteral(expression) {
-        return expression.kind === 184 &&
+        return expression.kind === 184 /* ObjectLiteralExpression */ &&
             expression.properties.length === 0;
     }
     ts.isEmptyObjectLiteral = isEmptyObjectLiteral;
     function isEmptyArrayLiteral(expression) {
-        return expression.kind === 183 &&
+        return expression.kind === 183 /* ArrayLiteralExpression */ &&
             expression.elements.length === 0;
     }
     ts.isEmptyArrayLiteral = isEmptyArrayLiteral;
@@ -7728,17 +10929,23 @@ var ts;
     }
     ts.getLocalSymbolForExportDefault = getLocalSymbolForExportDefault;
     function isExportDefaultSymbol(symbol) {
-        return symbol && ts.length(symbol.declarations) > 0 && hasModifier(symbol.declarations[0], 512);
+        return symbol && ts.length(symbol.declarations) > 0 && hasModifier(symbol.declarations[0], 512 /* Default */);
     }
+    /** Return ".ts", ".d.ts", or ".tsx", if that is the extension. */
     function tryExtractTypeScriptExtension(fileName) {
         return ts.find(ts.supportedTypescriptExtensionsForExtractExtension, function (extension) { return ts.fileExtensionIs(fileName, extension); });
     }
     ts.tryExtractTypeScriptExtension = tryExtractTypeScriptExtension;
+    /**
+     * Replace each instance of non-ascii characters by one, two, three, or four escape sequences
+     * representing the UTF-8 encoding of the character, and return the expanded char code list.
+     */
     function getExpandedCharCodes(input) {
         var output = [];
         var length = input.length;
         for (var i = 0; i < length; i++) {
             var charCode = input.charCodeAt(i);
+            // handle utf8
             if (charCode < 0x80) {
                 output.push(charCode);
             }
@@ -7764,6 +10971,9 @@ var ts;
         return output;
     }
     var base64Digits = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
+    /**
+     * Converts a string to a base-64 encoded ASCII string.
+     */
     function convertToBase64(input) {
         var result = "";
         var charCodes = getExpandedCharCodes(input);
@@ -7771,16 +10981,21 @@ var ts;
         var length = charCodes.length;
         var byte1, byte2, byte3, byte4;
         while (i < length) {
+            // Convert every 6-bits in the input 3 character points
+            // into a base64 digit
             byte1 = charCodes[i] >> 2;
             byte2 = (charCodes[i] & 3) << 4 | charCodes[i + 1] >> 4;
             byte3 = (charCodes[i + 1] & 15) << 2 | charCodes[i + 2] >> 6;
             byte4 = charCodes[i + 2] & 63;
+            // We are out of characters in the input, set the extra
+            // digits to 64 (padding character).
             if (i + 1 >= length) {
                 byte3 = byte4 = 64;
             }
             else if (i + 2 >= length) {
                 byte4 = 64;
             }
+            // Write to the output
             result += base64Digits.charAt(byte1) + base64Digits.charAt(byte2) + base64Digits.charAt(byte3) + base64Digits.charAt(byte4);
             i += 3;
         }
@@ -7806,9 +11021,12 @@ var ts;
                     i++;
                     nextCode = codes[i];
                 }
+                // `value` may be greater than 10FFFF (the maximum unicode codepoint) - JS will just make this into an invalid character for us
                 output += String.fromCharCode(value);
             }
             else {
+                // We don't want to kill the process when decoding fails (due to a following char byte not
+                // following a leading char), so we just print the (bad) value
                 output += String.fromCharCode(charCode);
                 i++;
             }
@@ -7830,9 +11048,11 @@ var ts;
         var expandedCharCodes = [];
         var i = 0;
         while (i < length) {
+            // Stop decoding once padding characters are present
             if (input.charCodeAt(i) === base64Digits.charCodeAt(64)) {
                 break;
             }
+            // convert 4 input digits into three characters, ignoring padding characters at the end
             var ch1 = base64Digits.indexOf(input[i]);
             var ch2 = base64Digits.indexOf(input[i + 1]);
             var ch3 = base64Digits.indexOf(input[i + 2]);
@@ -7840,10 +11060,10 @@ var ts;
             var code1 = ((ch1 & 63) << 2) | ((ch2 >> 4) & 3);
             var code2 = ((ch2 & 15) << 4) | ((ch3 >> 2) & 15);
             var code3 = ((ch3 & 3) << 6) | (ch4 & 63);
-            if (code2 === 0 && ch3 !== 0) {
+            if (code2 === 0 && ch3 !== 0) { // code2 decoded to zero, but ch3 was padding - elide code2 and code3
                 expandedCharCodes.push(code1);
             }
-            else if (code3 === 0 && ch4 !== 0) {
+            else if (code3 === 0 && ch4 !== 0) { // code3 decoded to zero, but ch4 was padding, elide code3
                 expandedCharCodes.push(code1, code2);
             }
             else {
@@ -7858,14 +11078,17 @@ var ts;
     var lineFeed = "\n";
     function getNewLineCharacter(options, getNewLine) {
         switch (options.newLine) {
-            case 0:
+            case 0 /* CarriageReturnLineFeed */:
                 return carriageReturnLineFeed;
-            case 1:
+            case 1 /* LineFeed */:
                 return lineFeed;
         }
         return getNewLine ? getNewLine() : ts.sys ? ts.sys.newLine : carriageReturnLineFeed;
     }
     ts.getNewLineCharacter = getNewLineCharacter;
+    /**
+     * Formats an enum value as a string for debugging and debug assertions.
+     */
     function formatEnum(value, enumObject, isFlags) {
         if (value === void 0) { value = 0; }
         var members = getEnumMembers(enumObject);
@@ -7907,61 +11130,96 @@ var ts;
         return ts.stableSort(result, function (x, y) { return ts.compareValues(x[0], y[0]); });
     }
     function formatSyntaxKind(kind) {
-        return formatEnum(kind, ts.SyntaxKind, false);
+        return formatEnum(kind, ts.SyntaxKind, /*isFlags*/ false);
     }
     ts.formatSyntaxKind = formatSyntaxKind;
     function formatModifierFlags(flags) {
-        return formatEnum(flags, ts.ModifierFlags, true);
+        return formatEnum(flags, ts.ModifierFlags, /*isFlags*/ true);
     }
     ts.formatModifierFlags = formatModifierFlags;
     function formatTransformFlags(flags) {
-        return formatEnum(flags, ts.TransformFlags, true);
+        return formatEnum(flags, ts.TransformFlags, /*isFlags*/ true);
     }
     ts.formatTransformFlags = formatTransformFlags;
     function formatEmitFlags(flags) {
-        return formatEnum(flags, ts.EmitFlags, true);
+        return formatEnum(flags, ts.EmitFlags, /*isFlags*/ true);
     }
     ts.formatEmitFlags = formatEmitFlags;
     function formatSymbolFlags(flags) {
-        return formatEnum(flags, ts.SymbolFlags, true);
+        return formatEnum(flags, ts.SymbolFlags, /*isFlags*/ true);
     }
     ts.formatSymbolFlags = formatSymbolFlags;
     function formatTypeFlags(flags) {
-        return formatEnum(flags, ts.TypeFlags, true);
+        return formatEnum(flags, ts.TypeFlags, /*isFlags*/ true);
     }
     ts.formatTypeFlags = formatTypeFlags;
     function formatObjectFlags(flags) {
-        return formatEnum(flags, ts.ObjectFlags, true);
+        return formatEnum(flags, ts.ObjectFlags, /*isFlags*/ true);
     }
     ts.formatObjectFlags = formatObjectFlags;
+    /**
+     * Creates a new TextRange from the provided pos and end.
+     *
+     * @param pos The start position.
+     * @param end The end position.
+     */
     function createRange(pos, end) {
         return { pos: pos, end: end };
     }
     ts.createRange = createRange;
+    /**
+     * Creates a new TextRange from a provided range with a new end position.
+     *
+     * @param range A TextRange.
+     * @param end The new end position.
+     */
     function moveRangeEnd(range, end) {
         return createRange(range.pos, end);
     }
     ts.moveRangeEnd = moveRangeEnd;
+    /**
+     * Creates a new TextRange from a provided range with a new start position.
+     *
+     * @param range A TextRange.
+     * @param pos The new Start position.
+     */
     function moveRangePos(range, pos) {
         return createRange(pos, range.end);
     }
     ts.moveRangePos = moveRangePos;
+    /**
+     * Moves the start position of a range past any decorators.
+     */
     function moveRangePastDecorators(node) {
         return node.decorators && node.decorators.length > 0
             ? moveRangePos(node, node.decorators.end)
             : node;
     }
     ts.moveRangePastDecorators = moveRangePastDecorators;
+    /**
+     * Moves the start position of a range past any decorators or modifiers.
+     */
     function moveRangePastModifiers(node) {
         return node.modifiers && node.modifiers.length > 0
             ? moveRangePos(node, node.modifiers.end)
             : moveRangePastDecorators(node);
     }
     ts.moveRangePastModifiers = moveRangePastModifiers;
+    /**
+     * Determines whether a TextRange has the same start and end positions.
+     *
+     * @param range A TextRange.
+     */
     function isCollapsedRange(range) {
         return range.pos === range.end;
     }
     ts.isCollapsedRange = isCollapsedRange;
+    /**
+     * Creates a new TextRange for a token at the provides start position.
+     *
+     * @param pos The start position.
+     * @param token The token.
+     */
     function createTokenRange(pos, token) {
         return createRange(pos, pos + ts.tokenToString(token).length);
     }
@@ -7995,12 +11253,16 @@ var ts;
         return ts.positionIsSynthesized(range.pos) ? -1 : ts.skipTrivia(sourceFile.text, range.pos);
     }
     ts.getStartPositionOfRange = getStartPositionOfRange;
+    /**
+     * Determines whether a name was originally the declaration name of an enum or namespace
+     * declaration.
+     */
     function isDeclarationNameOfEnumOrNamespace(node) {
         var parseNode = ts.getParseTreeNode(node);
         if (parseNode) {
             switch (parseNode.parent.kind) {
-                case 238:
-                case 239:
+                case 238 /* EnumDeclaration */:
+                case 239 /* ModuleDeclaration */:
                     return parseNode === parseNode.parent.name;
             }
         }
@@ -8015,67 +11277,79 @@ var ts;
         return node.initializer !== undefined;
     }
     function isWatchSet(options) {
+        // Firefox has Object.prototype.watch
         return options.watch && options.hasOwnProperty("watch");
     }
     ts.isWatchSet = isWatchSet;
     function getCheckFlags(symbol) {
-        return symbol.flags & 33554432 ? symbol.checkFlags : 0;
+        return symbol.flags & 33554432 /* Transient */ ? symbol.checkFlags : 0;
     }
     ts.getCheckFlags = getCheckFlags;
     function getDeclarationModifierFlagsFromSymbol(s) {
         if (s.valueDeclaration) {
             var flags = ts.getCombinedModifierFlags(s.valueDeclaration);
-            return s.parent && s.parent.flags & 32 ? flags : flags & ~28;
+            return s.parent && s.parent.flags & 32 /* Class */ ? flags : flags & ~28 /* AccessibilityModifier */;
         }
-        if (getCheckFlags(s) & 6) {
+        if (getCheckFlags(s) & 6 /* Synthetic */) {
             var checkFlags = s.checkFlags;
-            var accessModifier = checkFlags & 256 ? 8 :
-                checkFlags & 64 ? 4 :
-                    16;
-            var staticModifier = checkFlags & 512 ? 32 : 0;
+            var accessModifier = checkFlags & 256 /* ContainsPrivate */ ? 8 /* Private */ :
+                checkFlags & 64 /* ContainsPublic */ ? 4 /* Public */ :
+                    16 /* Protected */;
+            var staticModifier = checkFlags & 512 /* ContainsStatic */ ? 32 /* Static */ : 0;
             return accessModifier | staticModifier;
         }
-        if (s.flags & 4194304) {
-            return 4 | 32;
+        if (s.flags & 4194304 /* Prototype */) {
+            return 4 /* Public */ | 32 /* Static */;
         }
         return 0;
     }
     ts.getDeclarationModifierFlagsFromSymbol = getDeclarationModifierFlagsFromSymbol;
     function skipAlias(symbol, checker) {
-        return symbol.flags & 2097152 ? checker.getAliasedSymbol(symbol) : symbol;
+        return symbol.flags & 2097152 /* Alias */ ? checker.getAliasedSymbol(symbol) : symbol;
     }
     ts.skipAlias = skipAlias;
+    /** See comment on `declareModuleMember` in `binder.ts`. */
     function getCombinedLocalAndExportSymbolFlags(symbol) {
         return symbol.exportSymbol ? symbol.exportSymbol.flags | symbol.flags : symbol.flags;
     }
     ts.getCombinedLocalAndExportSymbolFlags = getCombinedLocalAndExportSymbolFlags;
     function isWriteOnlyAccess(node) {
-        return accessKind(node) === 1;
+        return accessKind(node) === 1 /* Write */;
     }
     ts.isWriteOnlyAccess = isWriteOnlyAccess;
     function isWriteAccess(node) {
-        return accessKind(node) !== 0;
+        return accessKind(node) !== 0 /* Read */;
     }
     ts.isWriteAccess = isWriteAccess;
+    var AccessKind;
+    (function (AccessKind) {
+        /** Only reads from a variable. */
+        AccessKind[AccessKind["Read"] = 0] = "Read";
+        /** Only writes to a variable without using the result. E.g.: `x++;`. */
+        AccessKind[AccessKind["Write"] = 1] = "Write";
+        /** Writes to a variable and uses the result as an expression. E.g.: `f(x++);`. */
+        AccessKind[AccessKind["ReadWrite"] = 2] = "ReadWrite";
+    })(AccessKind || (AccessKind = {}));
     function accessKind(node) {
         var parent = node.parent;
         if (!parent)
-            return 0;
+            return 0 /* Read */;
         switch (parent.kind) {
-            case 199:
-            case 198:
+            case 199 /* PostfixUnaryExpression */:
+            case 198 /* PrefixUnaryExpression */:
                 var operator = parent.operator;
-                return operator === 43 || operator === 44 ? writeOrReadWrite() : 0;
-            case 200:
+                return operator === 43 /* PlusPlusToken */ || operator === 44 /* MinusMinusToken */ ? writeOrReadWrite() : 0 /* Read */;
+            case 200 /* BinaryExpression */:
                 var _a = parent, left = _a.left, operatorToken = _a.operatorToken;
-                return left === node && isAssignmentOperator(operatorToken.kind) ? writeOrReadWrite() : 0;
-            case 185:
-                return parent.name !== node ? 0 : accessKind(parent);
+                return left === node && isAssignmentOperator(operatorToken.kind) ? writeOrReadWrite() : 0 /* Read */;
+            case 185 /* PropertyAccessExpression */:
+                return parent.name !== node ? 0 /* Read */ : accessKind(parent);
             default:
-                return 0;
+                return 0 /* Read */;
         }
         function writeOrReadWrite() {
-            return parent.parent && parent.parent.kind === 216 ? 1 : 2;
+            // If grandparent is not an ExpressionStatement, this is used as an expression in addition to having a side effect.
+            return parent.parent && parent.parent.kind === 216 /* ExpressionStatement */ ? 1 /* Write */ : 2 /* ReadWrite */;
         }
     }
     function compareDataObjects(dst, src) {
@@ -8097,30 +11371,43 @@ var ts;
         return true;
     }
     ts.compareDataObjects = compareDataObjects;
+    /**
+     * clears already present map by calling onDeleteExistingValue callback before deleting that key/value
+     */
     function clearMap(map, onDeleteValue) {
+        // Remove all
         map.forEach(onDeleteValue);
         map.clear();
     }
     ts.clearMap = clearMap;
+    /**
+     * Mutates the map with newMap such that keys in map will be same as newMap.
+     */
     function mutateMap(map, newMap, options) {
         var createNewValue = options.createNewValue, onDeleteValue = options.onDeleteValue, onExistingValue = options.onExistingValue;
+        // Needs update
         map.forEach(function (existingValue, key) {
             var valueInNewMap = newMap.get(key);
+            // Not present any more in new map, remove it
             if (valueInNewMap === undefined) {
                 map.delete(key);
                 onDeleteValue(existingValue, key);
             }
+            // If present notify about existing values
             else if (onExistingValue) {
                 onExistingValue(existingValue, valueInNewMap, key);
             }
         });
+        // Add new values that are not already present
         newMap.forEach(function (valueInNewMap, key) {
             if (!map.has(key)) {
+                // New values
                 map.set(key, createNewValue(key, valueInNewMap));
             }
         });
     }
     ts.mutateMap = mutateMap;
+    /** Calls `callback` on `directory` and every ancestor directory it has, returning the first defined result. */
     function forEachAncestorDirectory(directory, callback) {
         while (true) {
             var result = callback(directory);
@@ -8135,14 +11422,15 @@ var ts;
         }
     }
     ts.forEachAncestorDirectory = forEachAncestorDirectory;
+    // Return true if the given type is the constructor type for an abstract class
     function isAbstractConstructorType(type) {
-        return !!(getObjectFlags(type) & 16) && !!type.symbol && isAbstractConstructorSymbol(type.symbol);
+        return !!(getObjectFlags(type) & 16 /* Anonymous */) && !!type.symbol && isAbstractConstructorSymbol(type.symbol);
     }
     ts.isAbstractConstructorType = isAbstractConstructorType;
     function isAbstractConstructorSymbol(symbol) {
-        if (symbol.flags & 32) {
+        if (symbol.flags & 32 /* Class */) {
             var declaration = getClassLikeDeclarationOfSymbol(symbol);
-            return !!declaration && hasModifier(declaration, 128);
+            return !!declaration && hasModifier(declaration, 128 /* Abstract */);
         }
         return false;
     }
@@ -8152,11 +11440,11 @@ var ts;
     }
     ts.getClassLikeDeclarationOfSymbol = getClassLikeDeclarationOfSymbol;
     function getObjectFlags(type) {
-        return type.flags & 131072 ? type.objectFlags : 0;
+        return type.flags & 131072 /* Object */ ? type.objectFlags : 0;
     }
     ts.getObjectFlags = getObjectFlags;
     function typeHasCallOrConstructSignatures(type, checker) {
-        return checker.getSignaturesOfType(type, 0).length !== 0 || checker.getSignaturesOfType(type, 1).length !== 0;
+        return checker.getSignaturesOfType(type, 0 /* Call */).length !== 0 || checker.getSignaturesOfType(type, 1 /* Construct */).length !== 0;
     }
     ts.typeHasCallOrConstructSignatures = typeHasCallOrConstructSignatures;
     function forSomeAncestorDirectory(directory, callback) {
@@ -8178,6 +11466,7 @@ var ts;
             if (nodeIsPresent(child))
                 lastChild = child;
         }, function (children) {
+            // As an optimization, jump straight to the end of the list.
             for (var i = children.length - 1; i >= 0; i--) {
                 if (nodeIsPresent(children[i])) {
                     lastChild = children[i];
@@ -8206,14 +11495,14 @@ var ts;
 (function (ts) {
     function getDefaultLibFileName(options) {
         switch (options.target) {
-            case 6:
+            case 6 /* ESNext */:
                 return "lib.esnext.full.d.ts";
-            case 4:
+            case 4 /* ES2017 */:
                 return "lib.es2017.full.d.ts";
-            case 3:
+            case 3 /* ES2016 */:
                 return "lib.es2016.full.d.ts";
-            case 2:
-                return "lib.es6.d.ts";
+            case 2 /* ES2015 */:
+                return "lib.es6.d.ts"; // We don't use lib.es2015.full.d.ts due to breaking change.
             default:
                 return "lib.d.ts";
         }
@@ -8231,6 +11520,7 @@ var ts;
         return position >= span.start && position < textSpanEnd(span);
     }
     ts.textSpanContainsPosition = textSpanContainsPosition;
+    // Returns true if 'span' contains 'other'.
     function textSpanContainsTextSpan(span, other) {
         return other.start >= span.start && textSpanEnd(other) <= textSpanEnd(span);
     }
@@ -8278,6 +11568,7 @@ var ts;
         return { start: start, length: length };
     }
     ts.createTextSpan = createTextSpan;
+    /* @internal */
     function createTextRange(pos, end) {
         if (end === void 0) { end = pos; }
         ts.Debug.assert(end >= pos);
@@ -8304,6 +11595,14 @@ var ts;
     }
     ts.createTextChangeRange = createTextChangeRange;
     ts.unchangedTextChangeRange = createTextChangeRange(createTextSpan(0, 0), 0);
+    /**
+     * Called to merge all the changes that occurred across several versions of a script snapshot
+     * into a single change.  i.e. if a user keeps making successive edits to a script we will
+     * have a text change from V1 to V2, V2 to V3, ..., Vn.
+     *
+     * This function will then merge those changes into a single change range valid between V1 and
+     * Vn.
+     */
     function collapseTextChangeRangesAcrossMultipleVersions(changes) {
         if (changes.length === 0) {
             return ts.unchangedTextChangeRange;
@@ -8311,12 +11610,93 @@ var ts;
         if (changes.length === 1) {
             return changes[0];
         }
+        // We change from talking about { { oldStart, oldLength }, newLength } to { oldStart, oldEnd, newEnd }
+        // as it makes things much easier to reason about.
         var change0 = changes[0];
         var oldStartN = change0.span.start;
         var oldEndN = textSpanEnd(change0.span);
         var newEndN = oldStartN + change0.newLength;
         for (var i = 1; i < changes.length; i++) {
             var nextChange = changes[i];
+            // Consider the following case:
+            // i.e. two edits.  The first represents the text change range { { 10, 50 }, 30 }.  i.e. The span starting
+            // at 10, with length 50 is reduced to length 30.  The second represents the text change range { { 30, 30 }, 40 }.
+            // i.e. the span starting at 30 with length 30 is increased to length 40.
+            //
+            //      0         10        20        30        40        50        60        70        80        90        100
+            //      -------------------------------------------------------------------------------------------------------
+            //                |                                                 /
+            //                |                                            /----
+            //  T1            |                                       /----
+            //                |                                  /----
+            //                |                             /----
+            //      -------------------------------------------------------------------------------------------------------
+            //                                     |                            \
+            //                                     |                               \
+            //   T2                                |                                 \
+            //                                     |                                   \
+            //                                     |                                      \
+            //      -------------------------------------------------------------------------------------------------------
+            //
+            // Merging these turns out to not be too difficult.  First, determining the new start of the change is trivial
+            // it's just the min of the old and new starts.  i.e.:
+            //
+            //      0         10        20        30        40        50        60        70        80        90        100
+            //      ------------------------------------------------------------*------------------------------------------
+            //                |                                                 /
+            //                |                                            /----
+            //  T1            |                                       /----
+            //                |                                  /----
+            //                |                             /----
+            //      ----------------------------------------$-------------------$------------------------------------------
+            //                .                    |                            \
+            //                .                    |                               \
+            //   T2           .                    |                                 \
+            //                .                    |                                   \
+            //                .                    |                                      \
+            //      ----------------------------------------------------------------------*--------------------------------
+            //
+            // (Note the dots represent the newly inferred start.
+            // Determining the new and old end is also pretty simple.  Basically it boils down to paying attention to the
+            // absolute positions at the asterisks, and the relative change between the dollar signs. Basically, we see
+            // which if the two $'s precedes the other, and we move that one forward until they line up.  in this case that
+            // means:
+            //
+            //      0         10        20        30        40        50        60        70        80        90        100
+            //      --------------------------------------------------------------------------------*----------------------
+            //                |                                                                     /
+            //                |                                                                /----
+            //  T1            |                                                           /----
+            //                |                                                      /----
+            //                |                                                 /----
+            //      ------------------------------------------------------------$------------------------------------------
+            //                .                    |                            \
+            //                .                    |                               \
+            //   T2           .                    |                                 \
+            //                .                    |                                   \
+            //                .                    |                                      \
+            //      ----------------------------------------------------------------------*--------------------------------
+            //
+            // In other words (in this case), we're recognizing that the second edit happened after where the first edit
+            // ended with a delta of 20 characters (60 - 40).  Thus, if we go back in time to where the first edit started
+            // that's the same as if we started at char 80 instead of 60.
+            //
+            // As it so happens, the same logic applies if the second edit precedes the first edit.  In that case rather
+            // than pushing the first edit forward to match the second, we'll push the second edit forward to match the
+            // first.
+            //
+            // In this case that means we have { oldStart: 10, oldEnd: 80, newEnd: 70 } or, in TextChangeRange
+            // semantics: { { start: 10, length: 70 }, newLength: 60 }
+            //
+            // The math then works out as follows.
+            // If we have { oldStart1, oldEnd1, newEnd1 } and { oldStart2, oldEnd2, newEnd2 } then we can compute the
+            // final result like so:
+            //
+            // {
+            //      oldStart3: Min(oldStart1, oldStart2),
+            //      oldEnd3: Max(oldEnd1, oldEnd1 + (oldEnd2 - newEnd1)),
+            //      newEnd3: Max(newEnd2, newEnd2 + (newEnd1 - oldEnd2))
+            // }
             var oldStart1 = oldStartN;
             var oldEnd1 = oldEndN;
             var newEnd1 = newEndN;
@@ -8327,13 +11707,13 @@ var ts;
             oldEndN = Math.max(oldEnd1, oldEnd1 + (oldEnd2 - newEnd1));
             newEndN = Math.max(newEnd2, newEnd2 + (newEnd1 - oldEnd2));
         }
-        return createTextChangeRange(createTextSpanFromBounds(oldStartN, oldEndN), newEndN - oldStartN);
+        return createTextChangeRange(createTextSpanFromBounds(oldStartN, oldEndN), /*newLength*/ newEndN - oldStartN);
     }
     ts.collapseTextChangeRangesAcrossMultipleVersions = collapseTextChangeRangesAcrossMultipleVersions;
     function getTypeParameterOwner(d) {
-        if (d && d.kind === 148) {
+        if (d && d.kind === 148 /* TypeParameter */) {
             for (var current = d; current; current = current.parent) {
-                if (ts.isFunctionLike(current) || ts.isClassLike(current) || current.kind === 236) {
+                if (ts.isFunctionLike(current) || ts.isClassLike(current) || current.kind === 236 /* InterfaceDeclaration */) {
                     return current;
                 }
             }
@@ -8341,7 +11721,7 @@ var ts;
     }
     ts.getTypeParameterOwner = getTypeParameterOwner;
     function isParameterPropertyDeclaration(node) {
-        return ts.hasModifier(node, 92) && node.parent.kind === 155;
+        return ts.hasModifier(node, 92 /* ParameterPropertyModifier */) && node.parent.kind === 155 /* Constructor */;
     }
     ts.isParameterPropertyDeclaration = isParameterPropertyDeclaration;
     function isEmptyBindingPattern(node) {
@@ -8359,7 +11739,7 @@ var ts;
     }
     ts.isEmptyBindingElement = isEmptyBindingElement;
     function walkUpBindingElementsAndPatterns(node) {
-        while (node && (node.kind === 182 || ts.isBindingPattern(node))) {
+        while (node && (node.kind === 182 /* BindingElement */ || ts.isBindingPattern(node))) {
             node = node.parent;
         }
         return node;
@@ -8367,35 +11747,46 @@ var ts;
     function getCombinedModifierFlags(node) {
         node = walkUpBindingElementsAndPatterns(node);
         var flags = ts.getModifierFlags(node);
-        if (node.kind === 232) {
+        if (node.kind === 232 /* VariableDeclaration */) {
             node = node.parent;
         }
-        if (node && node.kind === 233) {
+        if (node && node.kind === 233 /* VariableDeclarationList */) {
             flags |= ts.getModifierFlags(node);
             node = node.parent;
         }
-        if (node && node.kind === 214) {
+        if (node && node.kind === 214 /* VariableStatement */) {
             flags |= ts.getModifierFlags(node);
         }
         return flags;
     }
     ts.getCombinedModifierFlags = getCombinedModifierFlags;
+    // Returns the node flags for this node and all relevant parent nodes.  This is done so that
+    // nodes like variable declarations and binding elements can returned a view of their flags
+    // that includes the modifiers from their container.  i.e. flags like export/declare aren't
+    // stored on the variable declaration directly, but on the containing variable statement
+    // (if it has one).  Similarly, flags for let/const are store on the variable declaration
+    // list.  By calling this function, all those flags are combined so that the client can treat
+    // the node as if it actually had those flags.
     function getCombinedNodeFlags(node) {
         node = walkUpBindingElementsAndPatterns(node);
         var flags = node.flags;
-        if (node.kind === 232) {
+        if (node.kind === 232 /* VariableDeclaration */) {
             node = node.parent;
         }
-        if (node && node.kind === 233) {
+        if (node && node.kind === 233 /* VariableDeclarationList */) {
             flags |= node.flags;
             node = node.parent;
         }
-        if (node && node.kind === 214) {
+        if (node && node.kind === 214 /* VariableStatement */) {
             flags |= node.flags;
         }
         return flags;
     }
     ts.getCombinedNodeFlags = getCombinedNodeFlags;
+    /**
+     * Checks to see if the locale is in the appropriate format,
+     * and if it is, attempts to set the appropriate language.
+     */
     function validateLocaleAndSetLanguage(locale, sys, errors) {
         var matchResult = /^([a-z]+)([_\-]([a-z]+))?$/.exec(locale.toLowerCase());
         if (!matchResult) {
@@ -8406,9 +11797,12 @@ var ts;
         }
         var language = matchResult[1];
         var territory = matchResult[3];
+        // First try the entire locale, then fall back to just language if that's all we have.
+        // Either ways do not fail, and fallback to the English diagnostic strings.
         if (!trySetLanguageAndTerritory(language, territory, errors)) {
-            trySetLanguageAndTerritory(language, undefined, errors);
+            trySetLanguageAndTerritory(language, /*territory*/ undefined, errors);
         }
+        // Set the UI locale for string collation
         ts.setUILocale(locale);
         function trySetLanguageAndTerritory(language, territory, errors) {
             var compilerFilePath = ts.normalizePath(sys.getExecutingFilePath());
@@ -8421,6 +11815,7 @@ var ts;
             if (!sys.fileExists(filePath)) {
                 return false;
             }
+            // TODO: Add codePage support for readFile?
             var fileContents = "";
             try {
                 fileContents = sys.readFile(filePath);
@@ -8432,6 +11827,7 @@ var ts;
                 return false;
             }
             try {
+                // tslint:disable-next-line no-unnecessary-qualifier (making clear this is a global mutation!)
                 ts.localizedDiagnosticMessages = JSON.parse(fileContents);
             }
             catch (_a) {
@@ -8453,8 +11849,13 @@ var ts;
         return !nodeTest || nodeTest(node) ? node : undefined;
     }
     ts.getOriginalNode = getOriginalNode;
+    /**
+     * Gets a value indicating whether a node originated in the parse tree.
+     *
+     * @param node The node to test.
+     */
     function isParseTreeNode(node) {
-        return (node.flags & 8) === 0;
+        return (node.flags & 8 /* Synthesized */) === 0;
     }
     ts.isParseTreeNode = isParseTreeNode;
     function getParseTreeNode(node, nodeTest) {
@@ -8468,9 +11869,15 @@ var ts;
         return undefined;
     }
     ts.getParseTreeNode = getParseTreeNode;
+    /**
+     * Remove extra underscore from escaped identifier text content.
+     *
+     * @param identifier The escaped identifier text.
+     * @returns The unescaped identifier text.
+     */
     function unescapeLeadingUnderscores(identifier) {
         var id = identifier;
-        return id.length >= 3 && id.charCodeAt(0) === 95 && id.charCodeAt(1) === 95 && id.charCodeAt(2) === 95 ? id.substr(1) : id;
+        return id.length >= 3 && id.charCodeAt(0) === 95 /* _ */ && id.charCodeAt(1) === 95 /* _ */ && id.charCodeAt(2) === 95 /* _ */ ? id.substr(1) : id;
     }
     ts.unescapeLeadingUnderscores = unescapeLeadingUnderscores;
     function idText(identifier) {
@@ -8481,42 +11888,55 @@ var ts;
         return unescapeLeadingUnderscores(symbol.escapedName);
     }
     ts.symbolName = symbolName;
+    /**
+     * Remove extra underscore from escaped identifier text content.
+     * @deprecated Use `id.text` for the unescaped text.
+     * @param identifier The escaped identifier text.
+     * @returns The unescaped identifier text.
+     */
     function unescapeIdentifier(id) {
         return id;
     }
     ts.unescapeIdentifier = unescapeIdentifier;
+    /**
+     * A JSDocTypedef tag has an _optional_ name field - if a name is not directly present, we should
+     * attempt to draw the name from the node the declaration is on (as that declaration is what its' symbol
+     * will be merged with)
+     */
     function nameForNamelessJSDocTypedef(declaration) {
         var hostNode = declaration.parent.parent;
         if (!hostNode) {
             return undefined;
         }
+        // Covers classes, functions - any named declaration host node
         if (ts.isDeclaration(hostNode)) {
             return getDeclarationIdentifier(hostNode);
         }
+        // Covers remaining cases
         switch (hostNode.kind) {
-            case 214:
+            case 214 /* VariableStatement */:
                 if (hostNode.declarationList && hostNode.declarationList.declarations[0]) {
                     return getDeclarationIdentifier(hostNode.declarationList.declarations[0]);
                 }
                 return undefined;
-            case 216:
+            case 216 /* ExpressionStatement */:
                 var expr = hostNode.expression;
                 switch (expr.kind) {
-                    case 185:
+                    case 185 /* PropertyAccessExpression */:
                         return expr.name;
-                    case 186:
+                    case 186 /* ElementAccessExpression */:
                         var arg = expr.argumentExpression;
                         if (ts.isIdentifier(arg)) {
                             return arg;
                         }
                 }
                 return undefined;
-            case 1:
+            case 1 /* EndOfFileToken */:
                 return undefined;
-            case 191: {
+            case 191 /* ParenthesizedExpression */: {
                 return getDeclarationIdentifier(hostNode.expression);
             }
-            case 228: {
+            case 228 /* LabeledStatement */: {
                 if (ts.isDeclaration(hostNode.statement) || ts.isExpression(hostNode.statement)) {
                     return getDeclarationIdentifier(hostNode.statement);
                 }
@@ -8534,48 +11954,50 @@ var ts;
         return declaration.name || nameForNamelessJSDocTypedef(declaration);
     }
     ts.getNameOfJSDocTypedef = getNameOfJSDocTypedef;
+    /** @internal */
     function isNamedDeclaration(node) {
-        return !!node.name;
+        return !!node.name; // A 'name' property should always be a DeclarationName.
     }
     ts.isNamedDeclaration = isNamedDeclaration;
+    // TODO: GH#18217 This is often used as if it returns a defined result
     function getNameOfDeclaration(declaration) {
         if (!declaration) {
             return undefined;
         }
         switch (declaration.kind) {
-            case 205:
-            case 192:
+            case 205 /* ClassExpression */:
+            case 192 /* FunctionExpression */:
                 if (!declaration.name) {
                     return getAssignedName(declaration);
                 }
                 break;
-            case 71:
+            case 71 /* Identifier */:
                 return declaration;
-            case 298:
-            case 293: {
+            case 298 /* JSDocPropertyTag */:
+            case 293 /* JSDocParameterTag */: {
                 var name = declaration.name;
-                if (name.kind === 146) {
+                if (name.kind === 146 /* QualifiedName */) {
                     return name.right;
                 }
                 break;
             }
-            case 200: {
+            case 200 /* BinaryExpression */: {
                 var expr = declaration;
                 switch (ts.getSpecialPropertyAssignmentKind(expr)) {
-                    case 1:
-                    case 4:
-                    case 5:
-                    case 3:
+                    case 1 /* ExportsProperty */:
+                    case 4 /* ThisProperty */:
+                    case 5 /* Property */:
+                    case 3 /* PrototypeProperty */:
                         return expr.left.name;
                     default:
                         return undefined;
                 }
             }
-            case 292:
+            case 292 /* JSDocCallbackTag */:
                 return declaration.name;
-            case 297:
+            case 297 /* JSDocTypedefTag */:
                 return getNameOfJSDocTypedef(declaration);
-            case 249: {
+            case 249 /* ExportAssignment */: {
                 var expression = declaration.expression;
                 return ts.isIdentifier(expression) ? expression : undefined;
             }
@@ -8599,6 +12021,19 @@ var ts;
             }
         }
     }
+    /**
+     * Gets the JSDoc parameter tags for the node if present.
+     *
+     * @remarks Returns any JSDoc param tag that matches the provided
+     * parameter, whether a param tag on a containing function
+     * expression, or a param tag on a variable declaration whose
+     * initializer is the containing function. The tags closest to the
+     * node are returned first, so in the previous example, the param
+     * tag on the containing function expression would be first.
+     *
+     * Does not return tags for binding patterns, because JSDoc matches
+     * parameters by name and binding patterns do not have a name.
+     */
     function getJSDocParameterTags(param) {
         if (param.name) {
             if (ts.isIdentifier(param.name)) {
@@ -8614,30 +12049,43 @@ var ts;
                 }
             }
         }
+        // return empty array for: out-of-order binding patterns and JSDoc function syntax, which has un-named parameters
         return ts.emptyArray;
     }
     ts.getJSDocParameterTags = getJSDocParameterTags;
+    /**
+     * Return true if the node has JSDoc parameter tags.
+     *
+     * @remarks Includes parameter tags that are not directly on the node,
+     * for example on a variable declaration whose initializer is a function expression.
+     */
     function hasJSDocParameterTags(node) {
         return !!getFirstJSDocTag(node, ts.isJSDocParameterTag);
     }
     ts.hasJSDocParameterTags = hasJSDocParameterTags;
+    /** Gets the JSDoc augments tag for the node if present */
     function getJSDocAugmentsTag(node) {
         return getFirstJSDocTag(node, ts.isJSDocAugmentsTag);
     }
     ts.getJSDocAugmentsTag = getJSDocAugmentsTag;
+    /** Gets the JSDoc class tag for the node if present */
     function getJSDocClassTag(node) {
         return getFirstJSDocTag(node, ts.isJSDocClassTag);
     }
     ts.getJSDocClassTag = getJSDocClassTag;
+    /** Gets the JSDoc return tag for the node if present */
     function getJSDocReturnTag(node) {
         return getFirstJSDocTag(node, ts.isJSDocReturnTag);
     }
     ts.getJSDocReturnTag = getJSDocReturnTag;
+    /** Gets the JSDoc template tag for the node if present */
     function getJSDocTemplateTag(node) {
         return getFirstJSDocTag(node, ts.isJSDocTemplateTag);
     }
     ts.getJSDocTemplateTag = getJSDocTemplateTag;
+    /** Gets the JSDoc type tag for the node if present and valid */
     function getJSDocTypeTag(node) {
+        // We should have already issued an error if there were multiple type jsdocs, so just use the first one.
         var tag = getFirstJSDocTag(node, ts.isJSDocTypeTag);
         if (tag && tag.typeExpression && tag.typeExpression.type) {
             return tag;
@@ -8645,6 +12093,17 @@ var ts;
         return undefined;
     }
     ts.getJSDocTypeTag = getJSDocTypeTag;
+    /**
+     * Gets the type node for the node if provided via JSDoc.
+     *
+     * @remarks The search includes any JSDoc param tag that relates
+     * to the provided parameter, for example a type tag on the
+     * parameter itself, or a param tag on a containing function
+     * expression, or a param tag on a variable declaration whose
+     * initializer is the containing function. The tags closest to the
+     * node are examined first, so in the previous example, the type
+     * tag directly on the node would be returned.
+     */
     function getJSDocType(node) {
         var tag = getFirstJSDocTag(node, ts.isJSDocTypeTag);
         if (!tag && ts.isParameter(node)) {
@@ -8653,13 +12112,21 @@ var ts;
         return tag && tag.typeExpression && tag.typeExpression.type;
     }
     ts.getJSDocType = getJSDocType;
+    /**
+     * Gets the return type node for the node if provided via JSDoc's return tag.
+     *
+     * @remarks `getJSDocReturnTag` just gets the whole JSDoc tag. This function
+     * gets the type from inside the braces.
+     */
     function getJSDocReturnType(node) {
         var returnTag = getJSDocReturnTag(node);
         return returnTag && returnTag.typeExpression && returnTag.typeExpression.type;
     }
     ts.getJSDocReturnType = getJSDocReturnType;
+    /** Get all JSDoc tags related to a node, including those on parent nodes. */
     function getJSDocTags(node) {
         var tags = node.jsDocCache;
+        // If cache is 'null', that means we did the work of searching for JSDoc tags and came up with nothing.
         if (tags === undefined) {
             var comments = ts.getJSDocCommentsAndTags(node);
             ts.Debug.assert(comments.length < 2 || comments[0] !== comments[1]);
@@ -8668,702 +12135,745 @@ var ts;
         return tags;
     }
     ts.getJSDocTags = getJSDocTags;
+    /** Get the first JSDoc tag of a specified kind, or undefined if not present. */
     function getFirstJSDocTag(node, predicate) {
         return ts.find(getJSDocTags(node), predicate);
     }
+    /** Gets all JSDoc tags of a specified kind, or undefined if not present. */
     function getAllJSDocTagsOfKind(node, kind) {
         return getJSDocTags(node).filter(function (doc) { return doc.kind === kind; });
     }
     ts.getAllJSDocTagsOfKind = getAllJSDocTagsOfKind;
 })(ts || (ts = {}));
+// Simple node tests of the form `node.kind === SyntaxKind.Foo`.
 (function (ts) {
+    // Literals
     function isNumericLiteral(node) {
-        return node.kind === 8;
+        return node.kind === 8 /* NumericLiteral */;
     }
     ts.isNumericLiteral = isNumericLiteral;
     function isStringLiteral(node) {
-        return node.kind === 9;
+        return node.kind === 9 /* StringLiteral */;
     }
     ts.isStringLiteral = isStringLiteral;
     function isJsxText(node) {
-        return node.kind === 10;
+        return node.kind === 10 /* JsxText */;
     }
     ts.isJsxText = isJsxText;
     function isRegularExpressionLiteral(node) {
-        return node.kind === 12;
+        return node.kind === 12 /* RegularExpressionLiteral */;
     }
     ts.isRegularExpressionLiteral = isRegularExpressionLiteral;
     function isNoSubstitutionTemplateLiteral(node) {
-        return node.kind === 13;
+        return node.kind === 13 /* NoSubstitutionTemplateLiteral */;
     }
     ts.isNoSubstitutionTemplateLiteral = isNoSubstitutionTemplateLiteral;
+    // Pseudo-literals
     function isTemplateHead(node) {
-        return node.kind === 14;
+        return node.kind === 14 /* TemplateHead */;
     }
     ts.isTemplateHead = isTemplateHead;
     function isTemplateMiddle(node) {
-        return node.kind === 15;
+        return node.kind === 15 /* TemplateMiddle */;
     }
     ts.isTemplateMiddle = isTemplateMiddle;
     function isTemplateTail(node) {
-        return node.kind === 16;
+        return node.kind === 16 /* TemplateTail */;
     }
     ts.isTemplateTail = isTemplateTail;
     function isIdentifier(node) {
-        return node.kind === 71;
+        return node.kind === 71 /* Identifier */;
     }
     ts.isIdentifier = isIdentifier;
+    // Names
     function isQualifiedName(node) {
-        return node.kind === 146;
+        return node.kind === 146 /* QualifiedName */;
     }
     ts.isQualifiedName = isQualifiedName;
     function isComputedPropertyName(node) {
-        return node.kind === 147;
+        return node.kind === 147 /* ComputedPropertyName */;
     }
     ts.isComputedPropertyName = isComputedPropertyName;
+    // Signature elements
     function isTypeParameterDeclaration(node) {
-        return node.kind === 148;
+        return node.kind === 148 /* TypeParameter */;
     }
     ts.isTypeParameterDeclaration = isTypeParameterDeclaration;
     function isParameter(node) {
-        return node.kind === 149;
+        return node.kind === 149 /* Parameter */;
     }
     ts.isParameter = isParameter;
     function isDecorator(node) {
-        return node.kind === 150;
+        return node.kind === 150 /* Decorator */;
     }
     ts.isDecorator = isDecorator;
+    // TypeMember
     function isPropertySignature(node) {
-        return node.kind === 151;
+        return node.kind === 151 /* PropertySignature */;
     }
     ts.isPropertySignature = isPropertySignature;
     function isPropertyDeclaration(node) {
-        return node.kind === 152;
+        return node.kind === 152 /* PropertyDeclaration */;
     }
     ts.isPropertyDeclaration = isPropertyDeclaration;
     function isMethodSignature(node) {
-        return node.kind === 153;
+        return node.kind === 153 /* MethodSignature */;
     }
     ts.isMethodSignature = isMethodSignature;
     function isMethodDeclaration(node) {
-        return node.kind === 154;
+        return node.kind === 154 /* MethodDeclaration */;
     }
     ts.isMethodDeclaration = isMethodDeclaration;
     function isConstructorDeclaration(node) {
-        return node.kind === 155;
+        return node.kind === 155 /* Constructor */;
     }
     ts.isConstructorDeclaration = isConstructorDeclaration;
     function isGetAccessorDeclaration(node) {
-        return node.kind === 156;
+        return node.kind === 156 /* GetAccessor */;
     }
     ts.isGetAccessorDeclaration = isGetAccessorDeclaration;
     function isSetAccessorDeclaration(node) {
-        return node.kind === 157;
+        return node.kind === 157 /* SetAccessor */;
     }
     ts.isSetAccessorDeclaration = isSetAccessorDeclaration;
     function isCallSignatureDeclaration(node) {
-        return node.kind === 158;
+        return node.kind === 158 /* CallSignature */;
     }
     ts.isCallSignatureDeclaration = isCallSignatureDeclaration;
     function isConstructSignatureDeclaration(node) {
-        return node.kind === 159;
+        return node.kind === 159 /* ConstructSignature */;
     }
     ts.isConstructSignatureDeclaration = isConstructSignatureDeclaration;
     function isIndexSignatureDeclaration(node) {
-        return node.kind === 160;
+        return node.kind === 160 /* IndexSignature */;
     }
     ts.isIndexSignatureDeclaration = isIndexSignatureDeclaration;
+    /* @internal */
     function isGetOrSetAccessorDeclaration(node) {
-        return node.kind === 157 || node.kind === 156;
+        return node.kind === 157 /* SetAccessor */ || node.kind === 156 /* GetAccessor */;
     }
     ts.isGetOrSetAccessorDeclaration = isGetOrSetAccessorDeclaration;
+    // Type
     function isTypePredicateNode(node) {
-        return node.kind === 161;
+        return node.kind === 161 /* TypePredicate */;
     }
     ts.isTypePredicateNode = isTypePredicateNode;
     function isTypeReferenceNode(node) {
-        return node.kind === 162;
+        return node.kind === 162 /* TypeReference */;
     }
     ts.isTypeReferenceNode = isTypeReferenceNode;
     function isFunctionTypeNode(node) {
-        return node.kind === 163;
+        return node.kind === 163 /* FunctionType */;
     }
     ts.isFunctionTypeNode = isFunctionTypeNode;
     function isConstructorTypeNode(node) {
-        return node.kind === 164;
+        return node.kind === 164 /* ConstructorType */;
     }
     ts.isConstructorTypeNode = isConstructorTypeNode;
     function isTypeQueryNode(node) {
-        return node.kind === 165;
+        return node.kind === 165 /* TypeQuery */;
     }
     ts.isTypeQueryNode = isTypeQueryNode;
     function isTypeLiteralNode(node) {
-        return node.kind === 166;
+        return node.kind === 166 /* TypeLiteral */;
     }
     ts.isTypeLiteralNode = isTypeLiteralNode;
     function isArrayTypeNode(node) {
-        return node.kind === 167;
+        return node.kind === 167 /* ArrayType */;
     }
     ts.isArrayTypeNode = isArrayTypeNode;
     function isTupleTypeNode(node) {
-        return node.kind === 168;
+        return node.kind === 168 /* TupleType */;
     }
     ts.isTupleTypeNode = isTupleTypeNode;
     function isUnionTypeNode(node) {
-        return node.kind === 169;
+        return node.kind === 169 /* UnionType */;
     }
     ts.isUnionTypeNode = isUnionTypeNode;
     function isIntersectionTypeNode(node) {
-        return node.kind === 170;
+        return node.kind === 170 /* IntersectionType */;
     }
     ts.isIntersectionTypeNode = isIntersectionTypeNode;
     function isConditionalTypeNode(node) {
-        return node.kind === 171;
+        return node.kind === 171 /* ConditionalType */;
     }
     ts.isConditionalTypeNode = isConditionalTypeNode;
     function isInferTypeNode(node) {
-        return node.kind === 172;
+        return node.kind === 172 /* InferType */;
     }
     ts.isInferTypeNode = isInferTypeNode;
     function isParenthesizedTypeNode(node) {
-        return node.kind === 173;
+        return node.kind === 173 /* ParenthesizedType */;
     }
     ts.isParenthesizedTypeNode = isParenthesizedTypeNode;
     function isThisTypeNode(node) {
-        return node.kind === 174;
+        return node.kind === 174 /* ThisType */;
     }
     ts.isThisTypeNode = isThisTypeNode;
     function isTypeOperatorNode(node) {
-        return node.kind === 175;
+        return node.kind === 175 /* TypeOperator */;
     }
     ts.isTypeOperatorNode = isTypeOperatorNode;
     function isIndexedAccessTypeNode(node) {
-        return node.kind === 176;
+        return node.kind === 176 /* IndexedAccessType */;
     }
     ts.isIndexedAccessTypeNode = isIndexedAccessTypeNode;
     function isMappedTypeNode(node) {
-        return node.kind === 177;
+        return node.kind === 177 /* MappedType */;
     }
     ts.isMappedTypeNode = isMappedTypeNode;
     function isLiteralTypeNode(node) {
-        return node.kind === 178;
+        return node.kind === 178 /* LiteralType */;
     }
     ts.isLiteralTypeNode = isLiteralTypeNode;
     function isImportTypeNode(node) {
-        return node.kind === 179;
+        return node.kind === 179 /* ImportType */;
     }
     ts.isImportTypeNode = isImportTypeNode;
+    // Binding patterns
     function isObjectBindingPattern(node) {
-        return node.kind === 180;
+        return node.kind === 180 /* ObjectBindingPattern */;
     }
     ts.isObjectBindingPattern = isObjectBindingPattern;
     function isArrayBindingPattern(node) {
-        return node.kind === 181;
+        return node.kind === 181 /* ArrayBindingPattern */;
     }
     ts.isArrayBindingPattern = isArrayBindingPattern;
     function isBindingElement(node) {
-        return node.kind === 182;
+        return node.kind === 182 /* BindingElement */;
     }
     ts.isBindingElement = isBindingElement;
+    // Expression
     function isArrayLiteralExpression(node) {
-        return node.kind === 183;
+        return node.kind === 183 /* ArrayLiteralExpression */;
     }
     ts.isArrayLiteralExpression = isArrayLiteralExpression;
     function isObjectLiteralExpression(node) {
-        return node.kind === 184;
+        return node.kind === 184 /* ObjectLiteralExpression */;
     }
     ts.isObjectLiteralExpression = isObjectLiteralExpression;
     function isPropertyAccessExpression(node) {
-        return node.kind === 185;
+        return node.kind === 185 /* PropertyAccessExpression */;
     }
     ts.isPropertyAccessExpression = isPropertyAccessExpression;
     function isElementAccessExpression(node) {
-        return node.kind === 186;
+        return node.kind === 186 /* ElementAccessExpression */;
     }
     ts.isElementAccessExpression = isElementAccessExpression;
     function isCallExpression(node) {
-        return node.kind === 187;
+        return node.kind === 187 /* CallExpression */;
     }
     ts.isCallExpression = isCallExpression;
     function isNewExpression(node) {
-        return node.kind === 188;
+        return node.kind === 188 /* NewExpression */;
     }
     ts.isNewExpression = isNewExpression;
     function isTaggedTemplateExpression(node) {
-        return node.kind === 189;
+        return node.kind === 189 /* TaggedTemplateExpression */;
     }
     ts.isTaggedTemplateExpression = isTaggedTemplateExpression;
     function isTypeAssertion(node) {
-        return node.kind === 190;
+        return node.kind === 190 /* TypeAssertionExpression */;
     }
     ts.isTypeAssertion = isTypeAssertion;
     function isParenthesizedExpression(node) {
-        return node.kind === 191;
+        return node.kind === 191 /* ParenthesizedExpression */;
     }
     ts.isParenthesizedExpression = isParenthesizedExpression;
     function skipPartiallyEmittedExpressions(node) {
-        while (node.kind === 301) {
+        while (node.kind === 301 /* PartiallyEmittedExpression */) {
             node = node.expression;
         }
         return node;
     }
     ts.skipPartiallyEmittedExpressions = skipPartiallyEmittedExpressions;
     function isFunctionExpression(node) {
-        return node.kind === 192;
+        return node.kind === 192 /* FunctionExpression */;
     }
     ts.isFunctionExpression = isFunctionExpression;
     function isArrowFunction(node) {
-        return node.kind === 193;
+        return node.kind === 193 /* ArrowFunction */;
     }
     ts.isArrowFunction = isArrowFunction;
     function isDeleteExpression(node) {
-        return node.kind === 194;
+        return node.kind === 194 /* DeleteExpression */;
     }
     ts.isDeleteExpression = isDeleteExpression;
     function isTypeOfExpression(node) {
-        return node.kind === 195;
+        return node.kind === 195 /* TypeOfExpression */;
     }
     ts.isTypeOfExpression = isTypeOfExpression;
     function isVoidExpression(node) {
-        return node.kind === 196;
+        return node.kind === 196 /* VoidExpression */;
     }
     ts.isVoidExpression = isVoidExpression;
     function isAwaitExpression(node) {
-        return node.kind === 197;
+        return node.kind === 197 /* AwaitExpression */;
     }
     ts.isAwaitExpression = isAwaitExpression;
     function isPrefixUnaryExpression(node) {
-        return node.kind === 198;
+        return node.kind === 198 /* PrefixUnaryExpression */;
     }
     ts.isPrefixUnaryExpression = isPrefixUnaryExpression;
     function isPostfixUnaryExpression(node) {
-        return node.kind === 199;
+        return node.kind === 199 /* PostfixUnaryExpression */;
     }
     ts.isPostfixUnaryExpression = isPostfixUnaryExpression;
     function isBinaryExpression(node) {
-        return node.kind === 200;
+        return node.kind === 200 /* BinaryExpression */;
     }
     ts.isBinaryExpression = isBinaryExpression;
     function isConditionalExpression(node) {
-        return node.kind === 201;
+        return node.kind === 201 /* ConditionalExpression */;
     }
     ts.isConditionalExpression = isConditionalExpression;
     function isTemplateExpression(node) {
-        return node.kind === 202;
+        return node.kind === 202 /* TemplateExpression */;
     }
     ts.isTemplateExpression = isTemplateExpression;
     function isYieldExpression(node) {
-        return node.kind === 203;
+        return node.kind === 203 /* YieldExpression */;
     }
     ts.isYieldExpression = isYieldExpression;
     function isSpreadElement(node) {
-        return node.kind === 204;
+        return node.kind === 204 /* SpreadElement */;
     }
     ts.isSpreadElement = isSpreadElement;
     function isClassExpression(node) {
-        return node.kind === 205;
+        return node.kind === 205 /* ClassExpression */;
     }
     ts.isClassExpression = isClassExpression;
     function isOmittedExpression(node) {
-        return node.kind === 206;
+        return node.kind === 206 /* OmittedExpression */;
     }
     ts.isOmittedExpression = isOmittedExpression;
     function isExpressionWithTypeArguments(node) {
-        return node.kind === 207;
+        return node.kind === 207 /* ExpressionWithTypeArguments */;
     }
     ts.isExpressionWithTypeArguments = isExpressionWithTypeArguments;
     function isAsExpression(node) {
-        return node.kind === 208;
+        return node.kind === 208 /* AsExpression */;
     }
     ts.isAsExpression = isAsExpression;
     function isNonNullExpression(node) {
-        return node.kind === 209;
+        return node.kind === 209 /* NonNullExpression */;
     }
     ts.isNonNullExpression = isNonNullExpression;
     function isMetaProperty(node) {
-        return node.kind === 210;
+        return node.kind === 210 /* MetaProperty */;
     }
     ts.isMetaProperty = isMetaProperty;
+    // Misc
     function isTemplateSpan(node) {
-        return node.kind === 211;
+        return node.kind === 211 /* TemplateSpan */;
     }
     ts.isTemplateSpan = isTemplateSpan;
     function isSemicolonClassElement(node) {
-        return node.kind === 212;
+        return node.kind === 212 /* SemicolonClassElement */;
     }
     ts.isSemicolonClassElement = isSemicolonClassElement;
+    // Block
     function isBlock(node) {
-        return node.kind === 213;
+        return node.kind === 213 /* Block */;
     }
     ts.isBlock = isBlock;
     function isVariableStatement(node) {
-        return node.kind === 214;
+        return node.kind === 214 /* VariableStatement */;
     }
     ts.isVariableStatement = isVariableStatement;
     function isEmptyStatement(node) {
-        return node.kind === 215;
+        return node.kind === 215 /* EmptyStatement */;
     }
     ts.isEmptyStatement = isEmptyStatement;
     function isExpressionStatement(node) {
-        return node.kind === 216;
+        return node.kind === 216 /* ExpressionStatement */;
     }
     ts.isExpressionStatement = isExpressionStatement;
     function isIfStatement(node) {
-        return node.kind === 217;
+        return node.kind === 217 /* IfStatement */;
     }
     ts.isIfStatement = isIfStatement;
     function isDoStatement(node) {
-        return node.kind === 218;
+        return node.kind === 218 /* DoStatement */;
     }
     ts.isDoStatement = isDoStatement;
     function isWhileStatement(node) {
-        return node.kind === 219;
+        return node.kind === 219 /* WhileStatement */;
     }
     ts.isWhileStatement = isWhileStatement;
     function isForStatement(node) {
-        return node.kind === 220;
+        return node.kind === 220 /* ForStatement */;
     }
     ts.isForStatement = isForStatement;
     function isForInStatement(node) {
-        return node.kind === 221;
+        return node.kind === 221 /* ForInStatement */;
     }
     ts.isForInStatement = isForInStatement;
     function isForOfStatement(node) {
-        return node.kind === 222;
+        return node.kind === 222 /* ForOfStatement */;
     }
     ts.isForOfStatement = isForOfStatement;
     function isContinueStatement(node) {
-        return node.kind === 223;
+        return node.kind === 223 /* ContinueStatement */;
     }
     ts.isContinueStatement = isContinueStatement;
     function isBreakStatement(node) {
-        return node.kind === 224;
+        return node.kind === 224 /* BreakStatement */;
     }
     ts.isBreakStatement = isBreakStatement;
     function isBreakOrContinueStatement(node) {
-        return node.kind === 224 || node.kind === 223;
+        return node.kind === 224 /* BreakStatement */ || node.kind === 223 /* ContinueStatement */;
     }
     ts.isBreakOrContinueStatement = isBreakOrContinueStatement;
     function isReturnStatement(node) {
-        return node.kind === 225;
+        return node.kind === 225 /* ReturnStatement */;
     }
     ts.isReturnStatement = isReturnStatement;
     function isWithStatement(node) {
-        return node.kind === 226;
+        return node.kind === 226 /* WithStatement */;
     }
     ts.isWithStatement = isWithStatement;
     function isSwitchStatement(node) {
-        return node.kind === 227;
+        return node.kind === 227 /* SwitchStatement */;
     }
     ts.isSwitchStatement = isSwitchStatement;
     function isLabeledStatement(node) {
-        return node.kind === 228;
+        return node.kind === 228 /* LabeledStatement */;
     }
     ts.isLabeledStatement = isLabeledStatement;
     function isThrowStatement(node) {
-        return node.kind === 229;
+        return node.kind === 229 /* ThrowStatement */;
     }
     ts.isThrowStatement = isThrowStatement;
     function isTryStatement(node) {
-        return node.kind === 230;
+        return node.kind === 230 /* TryStatement */;
     }
     ts.isTryStatement = isTryStatement;
     function isDebuggerStatement(node) {
-        return node.kind === 231;
+        return node.kind === 231 /* DebuggerStatement */;
     }
     ts.isDebuggerStatement = isDebuggerStatement;
     function isVariableDeclaration(node) {
-        return node.kind === 232;
+        return node.kind === 232 /* VariableDeclaration */;
     }
     ts.isVariableDeclaration = isVariableDeclaration;
     function isVariableDeclarationList(node) {
-        return node.kind === 233;
+        return node.kind === 233 /* VariableDeclarationList */;
     }
     ts.isVariableDeclarationList = isVariableDeclarationList;
     function isFunctionDeclaration(node) {
-        return node.kind === 234;
+        return node.kind === 234 /* FunctionDeclaration */;
     }
     ts.isFunctionDeclaration = isFunctionDeclaration;
     function isClassDeclaration(node) {
-        return node.kind === 235;
+        return node.kind === 235 /* ClassDeclaration */;
     }
     ts.isClassDeclaration = isClassDeclaration;
     function isInterfaceDeclaration(node) {
-        return node.kind === 236;
+        return node.kind === 236 /* InterfaceDeclaration */;
     }
     ts.isInterfaceDeclaration = isInterfaceDeclaration;
     function isTypeAliasDeclaration(node) {
-        return node.kind === 237;
+        return node.kind === 237 /* TypeAliasDeclaration */;
     }
     ts.isTypeAliasDeclaration = isTypeAliasDeclaration;
     function isEnumDeclaration(node) {
-        return node.kind === 238;
+        return node.kind === 238 /* EnumDeclaration */;
     }
     ts.isEnumDeclaration = isEnumDeclaration;
     function isModuleDeclaration(node) {
-        return node.kind === 239;
+        return node.kind === 239 /* ModuleDeclaration */;
     }
     ts.isModuleDeclaration = isModuleDeclaration;
     function isModuleBlock(node) {
-        return node.kind === 240;
+        return node.kind === 240 /* ModuleBlock */;
     }
     ts.isModuleBlock = isModuleBlock;
     function isCaseBlock(node) {
-        return node.kind === 241;
+        return node.kind === 241 /* CaseBlock */;
     }
     ts.isCaseBlock = isCaseBlock;
     function isNamespaceExportDeclaration(node) {
-        return node.kind === 242;
+        return node.kind === 242 /* NamespaceExportDeclaration */;
     }
     ts.isNamespaceExportDeclaration = isNamespaceExportDeclaration;
     function isImportEqualsDeclaration(node) {
-        return node.kind === 243;
+        return node.kind === 243 /* ImportEqualsDeclaration */;
     }
     ts.isImportEqualsDeclaration = isImportEqualsDeclaration;
     function isImportDeclaration(node) {
-        return node.kind === 244;
+        return node.kind === 244 /* ImportDeclaration */;
     }
     ts.isImportDeclaration = isImportDeclaration;
     function isImportClause(node) {
-        return node.kind === 245;
+        return node.kind === 245 /* ImportClause */;
     }
     ts.isImportClause = isImportClause;
     function isNamespaceImport(node) {
-        return node.kind === 246;
+        return node.kind === 246 /* NamespaceImport */;
     }
     ts.isNamespaceImport = isNamespaceImport;
     function isNamedImports(node) {
-        return node.kind === 247;
+        return node.kind === 247 /* NamedImports */;
     }
     ts.isNamedImports = isNamedImports;
     function isImportSpecifier(node) {
-        return node.kind === 248;
+        return node.kind === 248 /* ImportSpecifier */;
     }
     ts.isImportSpecifier = isImportSpecifier;
     function isExportAssignment(node) {
-        return node.kind === 249;
+        return node.kind === 249 /* ExportAssignment */;
     }
     ts.isExportAssignment = isExportAssignment;
     function isExportDeclaration(node) {
-        return node.kind === 250;
+        return node.kind === 250 /* ExportDeclaration */;
     }
     ts.isExportDeclaration = isExportDeclaration;
     function isNamedExports(node) {
-        return node.kind === 251;
+        return node.kind === 251 /* NamedExports */;
     }
     ts.isNamedExports = isNamedExports;
     function isExportSpecifier(node) {
-        return node.kind === 252;
+        return node.kind === 252 /* ExportSpecifier */;
     }
     ts.isExportSpecifier = isExportSpecifier;
     function isMissingDeclaration(node) {
-        return node.kind === 253;
+        return node.kind === 253 /* MissingDeclaration */;
     }
     ts.isMissingDeclaration = isMissingDeclaration;
+    // Module References
     function isExternalModuleReference(node) {
-        return node.kind === 254;
+        return node.kind === 254 /* ExternalModuleReference */;
     }
     ts.isExternalModuleReference = isExternalModuleReference;
+    // JSX
     function isJsxElement(node) {
-        return node.kind === 255;
+        return node.kind === 255 /* JsxElement */;
     }
     ts.isJsxElement = isJsxElement;
     function isJsxSelfClosingElement(node) {
-        return node.kind === 256;
+        return node.kind === 256 /* JsxSelfClosingElement */;
     }
     ts.isJsxSelfClosingElement = isJsxSelfClosingElement;
     function isJsxOpeningElement(node) {
-        return node.kind === 257;
+        return node.kind === 257 /* JsxOpeningElement */;
     }
     ts.isJsxOpeningElement = isJsxOpeningElement;
     function isJsxClosingElement(node) {
-        return node.kind === 258;
+        return node.kind === 258 /* JsxClosingElement */;
     }
     ts.isJsxClosingElement = isJsxClosingElement;
     function isJsxFragment(node) {
-        return node.kind === 259;
+        return node.kind === 259 /* JsxFragment */;
     }
     ts.isJsxFragment = isJsxFragment;
     function isJsxOpeningFragment(node) {
-        return node.kind === 260;
+        return node.kind === 260 /* JsxOpeningFragment */;
     }
     ts.isJsxOpeningFragment = isJsxOpeningFragment;
     function isJsxClosingFragment(node) {
-        return node.kind === 261;
+        return node.kind === 261 /* JsxClosingFragment */;
     }
     ts.isJsxClosingFragment = isJsxClosingFragment;
     function isJsxAttribute(node) {
-        return node.kind === 262;
+        return node.kind === 262 /* JsxAttribute */;
     }
     ts.isJsxAttribute = isJsxAttribute;
     function isJsxAttributes(node) {
-        return node.kind === 263;
+        return node.kind === 263 /* JsxAttributes */;
     }
     ts.isJsxAttributes = isJsxAttributes;
     function isJsxSpreadAttribute(node) {
-        return node.kind === 264;
+        return node.kind === 264 /* JsxSpreadAttribute */;
     }
     ts.isJsxSpreadAttribute = isJsxSpreadAttribute;
     function isJsxExpression(node) {
-        return node.kind === 265;
+        return node.kind === 265 /* JsxExpression */;
     }
     ts.isJsxExpression = isJsxExpression;
+    // Clauses
     function isCaseClause(node) {
-        return node.kind === 266;
+        return node.kind === 266 /* CaseClause */;
     }
     ts.isCaseClause = isCaseClause;
     function isDefaultClause(node) {
-        return node.kind === 267;
+        return node.kind === 267 /* DefaultClause */;
     }
     ts.isDefaultClause = isDefaultClause;
     function isHeritageClause(node) {
-        return node.kind === 268;
+        return node.kind === 268 /* HeritageClause */;
     }
     ts.isHeritageClause = isHeritageClause;
     function isCatchClause(node) {
-        return node.kind === 269;
+        return node.kind === 269 /* CatchClause */;
     }
     ts.isCatchClause = isCatchClause;
+    // Property assignments
     function isPropertyAssignment(node) {
-        return node.kind === 270;
+        return node.kind === 270 /* PropertyAssignment */;
     }
     ts.isPropertyAssignment = isPropertyAssignment;
     function isShorthandPropertyAssignment(node) {
-        return node.kind === 271;
+        return node.kind === 271 /* ShorthandPropertyAssignment */;
     }
     ts.isShorthandPropertyAssignment = isShorthandPropertyAssignment;
     function isSpreadAssignment(node) {
-        return node.kind === 272;
+        return node.kind === 272 /* SpreadAssignment */;
     }
     ts.isSpreadAssignment = isSpreadAssignment;
+    // Enum
     function isEnumMember(node) {
-        return node.kind === 273;
+        return node.kind === 273 /* EnumMember */;
     }
     ts.isEnumMember = isEnumMember;
+    // Top-level nodes
     function isSourceFile(node) {
-        return node.kind === 274;
+        return node.kind === 274 /* SourceFile */;
     }
     ts.isSourceFile = isSourceFile;
     function isBundle(node) {
-        return node.kind === 275;
+        return node.kind === 275 /* Bundle */;
     }
     ts.isBundle = isBundle;
+    function isUnparsedSource(node) {
+        return node.kind === 276 /* UnparsedSource */;
+    }
+    ts.isUnparsedSource = isUnparsedSource;
+    // JSDoc
     function isJSDocTypeExpression(node) {
-        return node.kind === 278;
+        return node.kind === 278 /* JSDocTypeExpression */;
     }
     ts.isJSDocTypeExpression = isJSDocTypeExpression;
     function isJSDocAllType(node) {
-        return node.kind === 279;
+        return node.kind === 279 /* JSDocAllType */;
     }
     ts.isJSDocAllType = isJSDocAllType;
     function isJSDocUnknownType(node) {
-        return node.kind === 280;
+        return node.kind === 280 /* JSDocUnknownType */;
     }
     ts.isJSDocUnknownType = isJSDocUnknownType;
     function isJSDocNullableType(node) {
-        return node.kind === 281;
+        return node.kind === 281 /* JSDocNullableType */;
     }
     ts.isJSDocNullableType = isJSDocNullableType;
     function isJSDocNonNullableType(node) {
-        return node.kind === 282;
+        return node.kind === 282 /* JSDocNonNullableType */;
     }
     ts.isJSDocNonNullableType = isJSDocNonNullableType;
     function isJSDocOptionalType(node) {
-        return node.kind === 283;
+        return node.kind === 283 /* JSDocOptionalType */;
     }
     ts.isJSDocOptionalType = isJSDocOptionalType;
     function isJSDocFunctionType(node) {
-        return node.kind === 284;
+        return node.kind === 284 /* JSDocFunctionType */;
     }
     ts.isJSDocFunctionType = isJSDocFunctionType;
     function isJSDocVariadicType(node) {
-        return node.kind === 285;
+        return node.kind === 285 /* JSDocVariadicType */;
     }
     ts.isJSDocVariadicType = isJSDocVariadicType;
     function isJSDoc(node) {
-        return node.kind === 286;
+        return node.kind === 286 /* JSDocComment */;
     }
     ts.isJSDoc = isJSDoc;
     function isJSDocAugmentsTag(node) {
-        return node.kind === 290;
+        return node.kind === 290 /* JSDocAugmentsTag */;
     }
     ts.isJSDocAugmentsTag = isJSDocAugmentsTag;
     function isJSDocClassTag(node) {
-        return node.kind === 291;
+        return node.kind === 291 /* JSDocClassTag */;
     }
     ts.isJSDocClassTag = isJSDocClassTag;
     function isJSDocParameterTag(node) {
-        return node.kind === 293;
+        return node.kind === 293 /* JSDocParameterTag */;
     }
     ts.isJSDocParameterTag = isJSDocParameterTag;
     function isJSDocReturnTag(node) {
-        return node.kind === 294;
+        return node.kind === 294 /* JSDocReturnTag */;
     }
     ts.isJSDocReturnTag = isJSDocReturnTag;
     function isJSDocTypeTag(node) {
-        return node.kind === 295;
+        return node.kind === 295 /* JSDocTypeTag */;
     }
     ts.isJSDocTypeTag = isJSDocTypeTag;
     function isJSDocTemplateTag(node) {
-        return node.kind === 296;
+        return node.kind === 296 /* JSDocTemplateTag */;
     }
     ts.isJSDocTemplateTag = isJSDocTemplateTag;
     function isJSDocTypedefTag(node) {
-        return node.kind === 297;
+        return node.kind === 297 /* JSDocTypedefTag */;
     }
     ts.isJSDocTypedefTag = isJSDocTypedefTag;
     function isJSDocPropertyTag(node) {
-        return node.kind === 298;
+        return node.kind === 298 /* JSDocPropertyTag */;
     }
     ts.isJSDocPropertyTag = isJSDocPropertyTag;
     function isJSDocPropertyLikeTag(node) {
-        return node.kind === 298 || node.kind === 293;
+        return node.kind === 298 /* JSDocPropertyTag */ || node.kind === 293 /* JSDocParameterTag */;
     }
     ts.isJSDocPropertyLikeTag = isJSDocPropertyLikeTag;
     function isJSDocTypeLiteral(node) {
-        return node.kind === 287;
+        return node.kind === 287 /* JSDocTypeLiteral */;
     }
     ts.isJSDocTypeLiteral = isJSDocTypeLiteral;
     function isJSDocCallbackTag(node) {
-        return node.kind === 292;
+        return node.kind === 292 /* JSDocCallbackTag */;
     }
     ts.isJSDocCallbackTag = isJSDocCallbackTag;
     function isJSDocSignature(node) {
-        return node.kind === 288;
+        return node.kind === 288 /* JSDocSignature */;
     }
     ts.isJSDocSignature = isJSDocSignature;
 })(ts || (ts = {}));
+// Node tests
+//
+// All node tests in the following list should *not* reference parent pointers so that
+// they may be used with transformations.
 (function (ts) {
+    /* @internal */
     function isSyntaxList(n) {
-        return n.kind === 299;
+        return n.kind === 299 /* SyntaxList */;
     }
     ts.isSyntaxList = isSyntaxList;
+    /* @internal */
     function isNode(node) {
         return isNodeKind(node.kind);
     }
     ts.isNode = isNode;
+    /* @internal */
     function isNodeKind(kind) {
-        return kind >= 146;
+        return kind >= 146 /* FirstNode */;
     }
     ts.isNodeKind = isNodeKind;
+    /**
+     * True if node is of some token syntax kind.
+     * For example, this is true for an IfKeyword but not for an IfStatement.
+     * Literals are considered tokens, except TemplateLiteral, but does include TemplateHead/Middle/Tail.
+     */
     function isToken(n) {
-        return n.kind >= 0 && n.kind <= 145;
+        return n.kind >= 0 /* FirstToken */ && n.kind <= 145 /* LastToken */;
     }
     ts.isToken = isToken;
+    // Node Arrays
+    /* @internal */
     function isNodeArray(array) {
         return array.hasOwnProperty("pos") && array.hasOwnProperty("end");
     }
     ts.isNodeArray = isNodeArray;
+    // Literals
+    /* @internal */
     function isLiteralKind(kind) {
-        return 8 <= kind && kind <= 13;
+        return 8 /* FirstLiteralToken */ <= kind && kind <= 13 /* LastLiteralToken */;
     }
     ts.isLiteralKind = isLiteralKind;
     function isLiteralExpression(node) {
         return isLiteralKind(node.kind);
     }
     ts.isLiteralExpression = isLiteralExpression;
+    // Pseudo-literals
+    /* @internal */
     function isTemplateLiteralKind(kind) {
-        return 13 <= kind && kind <= 16;
+        return 13 /* FirstTemplateToken */ <= kind && kind <= 16 /* LastTemplateToken */;
     }
     ts.isTemplateLiteralKind = isTemplateLiteralKind;
     function isTemplateLiteralToken(node) {
@@ -9372,42 +12882,48 @@ var ts;
     ts.isTemplateLiteralToken = isTemplateLiteralToken;
     function isTemplateMiddleOrTemplateTail(node) {
         var kind = node.kind;
-        return kind === 15
-            || kind === 16;
+        return kind === 15 /* TemplateMiddle */
+            || kind === 16 /* TemplateTail */;
     }
     ts.isTemplateMiddleOrTemplateTail = isTemplateMiddleOrTemplateTail;
     function isStringTextContainingNode(node) {
-        return node.kind === 9 || isTemplateLiteralKind(node.kind);
+        return node.kind === 9 /* StringLiteral */ || isTemplateLiteralKind(node.kind);
     }
     ts.isStringTextContainingNode = isStringTextContainingNode;
+    // Identifiers
+    /* @internal */
     function isGeneratedIdentifier(node) {
-        return ts.isIdentifier(node) && (node.autoGenerateFlags & 7) > 0;
+        return ts.isIdentifier(node) && (node.autoGenerateFlags & 7 /* KindMask */) > 0 /* None */;
     }
     ts.isGeneratedIdentifier = isGeneratedIdentifier;
+    // Keywords
+    /* @internal */
     function isModifierKind(token) {
         switch (token) {
-            case 117:
-            case 120:
-            case 76:
-            case 124:
-            case 79:
-            case 84:
-            case 114:
-            case 112:
-            case 113:
-            case 132:
-            case 115:
+            case 117 /* AbstractKeyword */:
+            case 120 /* AsyncKeyword */:
+            case 76 /* ConstKeyword */:
+            case 124 /* DeclareKeyword */:
+            case 79 /* DefaultKeyword */:
+            case 84 /* ExportKeyword */:
+            case 114 /* PublicKeyword */:
+            case 112 /* PrivateKeyword */:
+            case 113 /* ProtectedKeyword */:
+            case 132 /* ReadonlyKeyword */:
+            case 115 /* StaticKeyword */:
                 return true;
         }
         return false;
     }
     ts.isModifierKind = isModifierKind;
+    /* @internal */
     function isParameterPropertyModifier(kind) {
-        return !!(ts.modifierToFlag(kind) & 92);
+        return !!(ts.modifierToFlag(kind) & 92 /* ParameterPropertyModifier */);
     }
     ts.isParameterPropertyModifier = isParameterPropertyModifier;
+    /* @internal */
     function isClassMemberModifier(idToken) {
-        return isParameterPropertyModifier(idToken) || idToken === 115;
+        return isParameterPropertyModifier(idToken) || idToken === 115 /* StaticKeyword */;
     }
     ts.isClassMemberModifier = isClassMemberModifier;
     function isModifier(node) {
@@ -9416,104 +12932,111 @@ var ts;
     ts.isModifier = isModifier;
     function isEntityName(node) {
         var kind = node.kind;
-        return kind === 146
-            || kind === 71;
+        return kind === 146 /* QualifiedName */
+            || kind === 71 /* Identifier */;
     }
     ts.isEntityName = isEntityName;
     function isPropertyName(node) {
         var kind = node.kind;
-        return kind === 71
-            || kind === 9
-            || kind === 8
-            || kind === 147;
+        return kind === 71 /* Identifier */
+            || kind === 9 /* StringLiteral */
+            || kind === 8 /* NumericLiteral */
+            || kind === 147 /* ComputedPropertyName */;
     }
     ts.isPropertyName = isPropertyName;
     function isBindingName(node) {
         var kind = node.kind;
-        return kind === 71
-            || kind === 180
-            || kind === 181;
+        return kind === 71 /* Identifier */
+            || kind === 180 /* ObjectBindingPattern */
+            || kind === 181 /* ArrayBindingPattern */;
     }
     ts.isBindingName = isBindingName;
+    // Functions
     function isFunctionLike(node) {
         return node && isFunctionLikeKind(node.kind);
     }
     ts.isFunctionLike = isFunctionLike;
+    /* @internal */
     function isFunctionLikeDeclaration(node) {
         return node && isFunctionLikeDeclarationKind(node.kind);
     }
     ts.isFunctionLikeDeclaration = isFunctionLikeDeclaration;
     function isFunctionLikeDeclarationKind(kind) {
         switch (kind) {
-            case 234:
-            case 154:
-            case 155:
-            case 156:
-            case 157:
-            case 192:
-            case 193:
+            case 234 /* FunctionDeclaration */:
+            case 154 /* MethodDeclaration */:
+            case 155 /* Constructor */:
+            case 156 /* GetAccessor */:
+            case 157 /* SetAccessor */:
+            case 192 /* FunctionExpression */:
+            case 193 /* ArrowFunction */:
                 return true;
             default:
                 return false;
         }
     }
+    /* @internal */
     function isFunctionLikeKind(kind) {
         switch (kind) {
-            case 153:
-            case 158:
-            case 288:
-            case 159:
-            case 160:
-            case 163:
-            case 284:
-            case 164:
+            case 153 /* MethodSignature */:
+            case 158 /* CallSignature */:
+            case 288 /* JSDocSignature */:
+            case 159 /* ConstructSignature */:
+            case 160 /* IndexSignature */:
+            case 163 /* FunctionType */:
+            case 284 /* JSDocFunctionType */:
+            case 164 /* ConstructorType */:
                 return true;
             default:
                 return isFunctionLikeDeclarationKind(kind);
         }
     }
     ts.isFunctionLikeKind = isFunctionLikeKind;
+    /* @internal */
     function isFunctionOrModuleBlock(node) {
         return ts.isSourceFile(node) || ts.isModuleBlock(node) || ts.isBlock(node) && isFunctionLike(node.parent);
     }
     ts.isFunctionOrModuleBlock = isFunctionOrModuleBlock;
+    // Classes
     function isClassElement(node) {
         var kind = node.kind;
-        return kind === 155
-            || kind === 152
-            || kind === 154
-            || kind === 156
-            || kind === 157
-            || kind === 160
-            || kind === 212;
+        return kind === 155 /* Constructor */
+            || kind === 152 /* PropertyDeclaration */
+            || kind === 154 /* MethodDeclaration */
+            || kind === 156 /* GetAccessor */
+            || kind === 157 /* SetAccessor */
+            || kind === 160 /* IndexSignature */
+            || kind === 212 /* SemicolonClassElement */;
     }
     ts.isClassElement = isClassElement;
     function isClassLike(node) {
-        return node && (node.kind === 235 || node.kind === 205);
+        return node && (node.kind === 235 /* ClassDeclaration */ || node.kind === 205 /* ClassExpression */);
     }
     ts.isClassLike = isClassLike;
     function isAccessor(node) {
-        return node && (node.kind === 156 || node.kind === 157);
+        return node && (node.kind === 156 /* GetAccessor */ || node.kind === 157 /* SetAccessor */);
     }
     ts.isAccessor = isAccessor;
+    /* @internal */
     function isMethodOrAccessor(node) {
         switch (node.kind) {
-            case 154:
-            case 156:
-            case 157:
+            case 154 /* MethodDeclaration */:
+            case 156 /* GetAccessor */:
+            case 157 /* SetAccessor */:
                 return true;
             default:
                 return false;
         }
     }
     ts.isMethodOrAccessor = isMethodOrAccessor;
+    // Type members
     function isTypeElement(node) {
         var kind = node.kind;
-        return kind === 159
-            || kind === 158
-            || kind === 151
-            || kind === 153
-            || kind === 160;
+        return kind === 159 /* ConstructSignature */
+            || kind === 158 /* CallSignature */
+            || kind === 151 /* PropertySignature */
+            || kind === 153 /* MethodSignature */
+            || kind === 160 /* IndexSignature */;
     }
     ts.isTypeElement = isTypeElement;
     function isClassOrTypeElement(node) {
@@ -9522,125 +13045,153 @@ var ts;
     ts.isClassOrTypeElement = isClassOrTypeElement;
     function isObjectLiteralElementLike(node) {
         var kind = node.kind;
-        return kind === 270
-            || kind === 271
-            || kind === 272
-            || kind === 154
-            || kind === 156
-            || kind === 157;
+        return kind === 270 /* PropertyAssignment */
+            || kind === 271 /* ShorthandPropertyAssignment */
+            || kind === 272 /* SpreadAssignment */
+            || kind === 154 /* MethodDeclaration */
+            || kind === 156 /* GetAccessor */
+            || kind === 157 /* SetAccessor */;
     }
     ts.isObjectLiteralElementLike = isObjectLiteralElementLike;
+    // Type
     function isTypeNodeKind(kind) {
-        return (kind >= 161 && kind <= 179)
-            || kind === 119
-            || kind === 142
-            || kind === 134
-            || kind === 135
-            || kind === 122
-            || kind === 137
-            || kind === 138
-            || kind === 99
-            || kind === 105
-            || kind === 140
-            || kind === 95
-            || kind === 131
-            || kind === 207
-            || kind === 279
-            || kind === 280
-            || kind === 281
-            || kind === 282
-            || kind === 283
-            || kind === 284
-            || kind === 285;
+        return (kind >= 161 /* FirstTypeNode */ && kind <= 179 /* LastTypeNode */)
+            || kind === 119 /* AnyKeyword */
+            || kind === 142 /* UnknownKeyword */
+            || kind === 134 /* NumberKeyword */
+            || kind === 135 /* ObjectKeyword */
+            || kind === 122 /* BooleanKeyword */
+            || kind === 137 /* StringKeyword */
+            || kind === 138 /* SymbolKeyword */
+            || kind === 99 /* ThisKeyword */
+            || kind === 105 /* VoidKeyword */
+            || kind === 140 /* UndefinedKeyword */
+            || kind === 95 /* NullKeyword */
+            || kind === 131 /* NeverKeyword */
+            || kind === 207 /* ExpressionWithTypeArguments */
+            || kind === 279 /* JSDocAllType */
+            || kind === 280 /* JSDocUnknownType */
+            || kind === 281 /* JSDocNullableType */
+            || kind === 282 /* JSDocNonNullableType */
+            || kind === 283 /* JSDocOptionalType */
+            || kind === 284 /* JSDocFunctionType */
+            || kind === 285 /* JSDocVariadicType */;
     }
+    /**
+     * Node test that determines whether a node is a valid type node.
+     * This differs from the `isPartOfTypeNode` function which determines whether a node is *part*
+     * of a TypeNode.
+     */
     function isTypeNode(node) {
         return isTypeNodeKind(node.kind);
     }
     ts.isTypeNode = isTypeNode;
     function isFunctionOrConstructorTypeNode(node) {
         switch (node.kind) {
-            case 163:
-            case 164:
+            case 163 /* FunctionType */:
+            case 164 /* ConstructorType */:
                 return true;
         }
         return false;
     }
     ts.isFunctionOrConstructorTypeNode = isFunctionOrConstructorTypeNode;
+    // Binding patterns
+    /* @internal */
     function isBindingPattern(node) {
         if (node) {
             var kind = node.kind;
-            return kind === 181
-                || kind === 180;
+            return kind === 181 /* ArrayBindingPattern */
+                || kind === 180 /* ObjectBindingPattern */;
         }
         return false;
     }
     ts.isBindingPattern = isBindingPattern;
+    /* @internal */
     function isAssignmentPattern(node) {
         var kind = node.kind;
-        return kind === 183
-            || kind === 184;
+        return kind === 183 /* ArrayLiteralExpression */
+            || kind === 184 /* ObjectLiteralExpression */;
     }
     ts.isAssignmentPattern = isAssignmentPattern;
+    /* @internal */
     function isArrayBindingElement(node) {
         var kind = node.kind;
-        return kind === 182
-            || kind === 206;
+        return kind === 182 /* BindingElement */
+            || kind === 206 /* OmittedExpression */;
     }
     ts.isArrayBindingElement = isArrayBindingElement;
+    /**
+     * Determines whether the BindingOrAssignmentElement is a BindingElement-like declaration
+     */
+    /* @internal */
     function isDeclarationBindingElement(bindingElement) {
         switch (bindingElement.kind) {
-            case 232:
-            case 149:
-            case 182:
+            case 232 /* VariableDeclaration */:
+            case 149 /* Parameter */:
+            case 182 /* BindingElement */:
                 return true;
         }
         return false;
     }
     ts.isDeclarationBindingElement = isDeclarationBindingElement;
+    /**
+     * Determines whether a node is a BindingOrAssignmentPattern
+     */
+    /* @internal */
     function isBindingOrAssignmentPattern(node) {
         return isObjectBindingOrAssignmentPattern(node)
             || isArrayBindingOrAssignmentPattern(node);
     }
     ts.isBindingOrAssignmentPattern = isBindingOrAssignmentPattern;
+    /**
+     * Determines whether a node is an ObjectBindingOrAssignmentPattern
+     */
+    /* @internal */
     function isObjectBindingOrAssignmentPattern(node) {
         switch (node.kind) {
-            case 180:
-            case 184:
+            case 180 /* ObjectBindingPattern */:
+            case 184 /* ObjectLiteralExpression */:
                 return true;
         }
         return false;
     }
     ts.isObjectBindingOrAssignmentPattern = isObjectBindingOrAssignmentPattern;
+    /**
+     * Determines whether a node is an ArrayBindingOrAssignmentPattern
+     */
+    /* @internal */
     function isArrayBindingOrAssignmentPattern(node) {
         switch (node.kind) {
-            case 181:
-            case 183:
+            case 181 /* ArrayBindingPattern */:
+            case 183 /* ArrayLiteralExpression */:
                 return true;
         }
         return false;
     }
     ts.isArrayBindingOrAssignmentPattern = isArrayBindingOrAssignmentPattern;
+    /* @internal */
     function isPropertyAccessOrQualifiedNameOrImportTypeNode(node) {
         var kind = node.kind;
-        return kind === 185
-            || kind === 146
-            || kind === 179;
+        return kind === 185 /* PropertyAccessExpression */
+            || kind === 146 /* QualifiedName */
+            || kind === 179 /* ImportType */;
     }
     ts.isPropertyAccessOrQualifiedNameOrImportTypeNode = isPropertyAccessOrQualifiedNameOrImportTypeNode;
+    // Expression
     function isPropertyAccessOrQualifiedName(node) {
         var kind = node.kind;
-        return kind === 185
-            || kind === 146;
+        return kind === 185 /* PropertyAccessExpression */
+            || kind === 146 /* QualifiedName */;
     }
     ts.isPropertyAccessOrQualifiedName = isPropertyAccessOrQualifiedName;
     function isCallLikeExpression(node) {
         switch (node.kind) {
-            case 257:
-            case 256:
-            case 187:
-            case 188:
-            case 189:
-            case 150:
+            case 257 /* JsxOpeningElement */:
+            case 256 /* JsxSelfClosingElement */:
+            case 187 /* CallExpression */:
+            case 188 /* NewExpression */:
+            case 189 /* TaggedTemplateExpression */:
+            case 150 /* Decorator */:
                 return true;
             default:
                 return false;
@@ -9648,98 +13199,106 @@ var ts;
     }
     ts.isCallLikeExpression = isCallLikeExpression;
     function isCallOrNewExpression(node) {
-        return node.kind === 187 || node.kind === 188;
+        return node.kind === 187 /* CallExpression */ || node.kind === 188 /* NewExpression */;
     }
     ts.isCallOrNewExpression = isCallOrNewExpression;
     function isTemplateLiteral(node) {
         var kind = node.kind;
-        return kind === 202
-            || kind === 13;
+        return kind === 202 /* TemplateExpression */
+            || kind === 13 /* NoSubstitutionTemplateLiteral */;
     }
     ts.isTemplateLiteral = isTemplateLiteral;
+    /* @internal */
     function isLeftHandSideExpression(node) {
         return isLeftHandSideExpressionKind(ts.skipPartiallyEmittedExpressions(node).kind);
     }
     ts.isLeftHandSideExpression = isLeftHandSideExpression;
     function isLeftHandSideExpressionKind(kind) {
         switch (kind) {
-            case 185:
-            case 186:
-            case 188:
-            case 187:
-            case 255:
-            case 256:
-            case 259:
-            case 189:
-            case 183:
-            case 191:
-            case 184:
-            case 205:
-            case 192:
-            case 71:
-            case 12:
-            case 8:
-            case 9:
-            case 13:
-            case 202:
-            case 86:
-            case 95:
-            case 99:
-            case 101:
-            case 97:
-            case 209:
-            case 210:
-            case 91:
+            case 185 /* PropertyAccessExpression */:
+            case 186 /* ElementAccessExpression */:
+            case 188 /* NewExpression */:
+            case 187 /* CallExpression */:
+            case 255 /* JsxElement */:
+            case 256 /* JsxSelfClosingElement */:
+            case 259 /* JsxFragment */:
+            case 189 /* TaggedTemplateExpression */:
+            case 183 /* ArrayLiteralExpression */:
+            case 191 /* ParenthesizedExpression */:
+            case 184 /* ObjectLiteralExpression */:
+            case 205 /* ClassExpression */:
+            case 192 /* FunctionExpression */:
+            case 71 /* Identifier */:
+            case 12 /* RegularExpressionLiteral */:
+            case 8 /* NumericLiteral */:
+            case 9 /* StringLiteral */:
+            case 13 /* NoSubstitutionTemplateLiteral */:
+            case 202 /* TemplateExpression */:
+            case 86 /* FalseKeyword */:
+            case 95 /* NullKeyword */:
+            case 99 /* ThisKeyword */:
+            case 101 /* TrueKeyword */:
+            case 97 /* SuperKeyword */:
+            case 209 /* NonNullExpression */:
+            case 210 /* MetaProperty */:
+            case 91 /* ImportKeyword */: // technically this is only an Expression if it's in a CallExpression
                 return true;
             default:
                 return false;
         }
     }
+    /* @internal */
     function isUnaryExpression(node) {
         return isUnaryExpressionKind(ts.skipPartiallyEmittedExpressions(node).kind);
     }
     ts.isUnaryExpression = isUnaryExpression;
     function isUnaryExpressionKind(kind) {
         switch (kind) {
-            case 198:
-            case 199:
-            case 194:
-            case 195:
-            case 196:
-            case 197:
-            case 190:
+            case 198 /* PrefixUnaryExpression */:
+            case 199 /* PostfixUnaryExpression */:
+            case 194 /* DeleteExpression */:
+            case 195 /* TypeOfExpression */:
+            case 196 /* VoidExpression */:
+            case 197 /* AwaitExpression */:
+            case 190 /* TypeAssertionExpression */:
                 return true;
             default:
                 return isLeftHandSideExpressionKind(kind);
         }
     }
+    /* @internal */
     function isUnaryExpressionWithWrite(expr) {
         switch (expr.kind) {
-            case 199:
+            case 199 /* PostfixUnaryExpression */:
                 return true;
-            case 198:
-                return expr.operator === 43 ||
-                    expr.operator === 44;
+            case 198 /* PrefixUnaryExpression */:
+                return expr.operator === 43 /* PlusPlusToken */ ||
+                    expr.operator === 44 /* MinusMinusToken */;
             default:
                 return false;
         }
     }
     ts.isUnaryExpressionWithWrite = isUnaryExpressionWithWrite;
+    /* @internal */
+    /**
+     * Determines whether a node is an expression based only on its kind.
+     * Use `isExpressionNode` if not in transforms.
+     */
     function isExpression(node) {
         return isExpressionKind(ts.skipPartiallyEmittedExpressions(node).kind);
     }
     ts.isExpression = isExpression;
     function isExpressionKind(kind) {
         switch (kind) {
-            case 201:
-            case 203:
-            case 193:
-            case 200:
-            case 204:
-            case 208:
-            case 206:
-            case 302:
-            case 301:
+            case 201 /* ConditionalExpression */:
+            case 203 /* YieldExpression */:
+            case 193 /* ArrowFunction */:
+            case 200 /* BinaryExpression */:
+            case 204 /* SpreadElement */:
+            case 208 /* AsExpression */:
+            case 206 /* OmittedExpression */:
+            case 302 /* CommaListExpression */:
+            case 301 /* PartiallyEmittedExpression */:
                 return true;
             default:
                 return isUnaryExpressionKind(kind);
@@ -9747,18 +13306,21 @@ var ts;
     }
     function isAssertionExpression(node) {
         var kind = node.kind;
-        return kind === 190
-            || kind === 208;
+        return kind === 190 /* TypeAssertionExpression */
+            || kind === 208 /* AsExpression */;
     }
     ts.isAssertionExpression = isAssertionExpression;
+    /* @internal */
     function isPartiallyEmittedExpression(node) {
-        return node.kind === 301;
+        return node.kind === 301 /* PartiallyEmittedExpression */;
     }
     ts.isPartiallyEmittedExpression = isPartiallyEmittedExpression;
+    /* @internal */
     function isNotEmittedStatement(node) {
-        return node.kind === 300;
+        return node.kind === 300 /* NotEmittedStatement */;
     }
     ts.isNotEmittedStatement = isNotEmittedStatement;
+    /* @internal */
     function isNotEmittedOrPartiallyEmittedNode(node) {
         return isNotEmittedStatement(node)
             || isPartiallyEmittedExpression(node);
@@ -9766,152 +13328,169 @@ var ts;
     ts.isNotEmittedOrPartiallyEmittedNode = isNotEmittedOrPartiallyEmittedNode;
     function isIterationStatement(node, lookInLabeledStatements) {
         switch (node.kind) {
-            case 220:
-            case 221:
-            case 222:
-            case 218:
-            case 219:
+            case 220 /* ForStatement */:
+            case 221 /* ForInStatement */:
+            case 222 /* ForOfStatement */:
+            case 218 /* DoStatement */:
+            case 219 /* WhileStatement */:
                 return true;
-            case 228:
+            case 228 /* LabeledStatement */:
                 return lookInLabeledStatements && isIterationStatement(node.statement, lookInLabeledStatements);
         }
         return false;
     }
     ts.isIterationStatement = isIterationStatement;
+    /* @internal */
     function isForInOrOfStatement(node) {
-        return node.kind === 221 || node.kind === 222;
+        return node.kind === 221 /* ForInStatement */ || node.kind === 222 /* ForOfStatement */;
     }
     ts.isForInOrOfStatement = isForInOrOfStatement;
+    // Element
+    /* @internal */
     function isConciseBody(node) {
         return ts.isBlock(node)
             || isExpression(node);
     }
     ts.isConciseBody = isConciseBody;
+    /* @internal */
     function isFunctionBody(node) {
         return ts.isBlock(node);
     }
     ts.isFunctionBody = isFunctionBody;
+    /* @internal */
     function isForInitializer(node) {
         return ts.isVariableDeclarationList(node)
             || isExpression(node);
     }
     ts.isForInitializer = isForInitializer;
+    /* @internal */
     function isModuleBody(node) {
         var kind = node.kind;
-        return kind === 240
-            || kind === 239
-            || kind === 71;
+        return kind === 240 /* ModuleBlock */
+            || kind === 239 /* ModuleDeclaration */
+            || kind === 71 /* Identifier */;
     }
     ts.isModuleBody = isModuleBody;
+    /* @internal */
     function isNamespaceBody(node) {
         var kind = node.kind;
-        return kind === 240
-            || kind === 239;
+        return kind === 240 /* ModuleBlock */
+            || kind === 239 /* ModuleDeclaration */;
     }
     ts.isNamespaceBody = isNamespaceBody;
+    /* @internal */
     function isJSDocNamespaceBody(node) {
         var kind = node.kind;
-        return kind === 71
-            || kind === 239;
+        return kind === 71 /* Identifier */
+            || kind === 239 /* ModuleDeclaration */;
     }
     ts.isJSDocNamespaceBody = isJSDocNamespaceBody;
+    /* @internal */
     function isNamedImportBindings(node) {
         var kind = node.kind;
-        return kind === 247
-            || kind === 246;
+        return kind === 247 /* NamedImports */
+            || kind === 246 /* NamespaceImport */;
     }
     ts.isNamedImportBindings = isNamedImportBindings;
+    /* @internal */
     function isModuleOrEnumDeclaration(node) {
-        return node.kind === 239 || node.kind === 238;
+        return node.kind === 239 /* ModuleDeclaration */ || node.kind === 238 /* EnumDeclaration */;
     }
     ts.isModuleOrEnumDeclaration = isModuleOrEnumDeclaration;
     function isDeclarationKind(kind) {
-        return kind === 193
-            || kind === 182
-            || kind === 235
-            || kind === 205
-            || kind === 155
-            || kind === 238
-            || kind === 273
-            || kind === 252
-            || kind === 234
-            || kind === 192
-            || kind === 156
-            || kind === 245
-            || kind === 243
-            || kind === 248
-            || kind === 236
-            || kind === 262
-            || kind === 154
-            || kind === 153
-            || kind === 239
-            || kind === 242
-            || kind === 246
-            || kind === 149
-            || kind === 270
-            || kind === 152
-            || kind === 151
-            || kind === 157
-            || kind === 271
-            || kind === 237
-            || kind === 148
-            || kind === 232
-            || kind === 297
-            || kind === 292
-            || kind === 298;
+        return kind === 193 /* ArrowFunction */
+            || kind === 182 /* BindingElement */
+            || kind === 235 /* ClassDeclaration */
+            || kind === 205 /* ClassExpression */
+            || kind === 155 /* Constructor */
+            || kind === 238 /* EnumDeclaration */
+            || kind === 273 /* EnumMember */
+            || kind === 252 /* ExportSpecifier */
+            || kind === 234 /* FunctionDeclaration */
+            || kind === 192 /* FunctionExpression */
+            || kind === 156 /* GetAccessor */
+            || kind === 245 /* ImportClause */
+            || kind === 243 /* ImportEqualsDeclaration */
+            || kind === 248 /* ImportSpecifier */
+            || kind === 236 /* InterfaceDeclaration */
+            || kind === 262 /* JsxAttribute */
+            || kind === 154 /* MethodDeclaration */
+            || kind === 153 /* MethodSignature */
+            || kind === 239 /* ModuleDeclaration */
+            || kind === 242 /* NamespaceExportDeclaration */
+            || kind === 246 /* NamespaceImport */
+            || kind === 149 /* Parameter */
+            || kind === 270 /* PropertyAssignment */
+            || kind === 152 /* PropertyDeclaration */
+            || kind === 151 /* PropertySignature */
+            || kind === 157 /* SetAccessor */
+            || kind === 271 /* ShorthandPropertyAssignment */
+            || kind === 237 /* TypeAliasDeclaration */
+            || kind === 148 /* TypeParameter */
+            || kind === 232 /* VariableDeclaration */
+            || kind === 297 /* JSDocTypedefTag */
+            || kind === 292 /* JSDocCallbackTag */
+            || kind === 298 /* JSDocPropertyTag */;
     }
     function isDeclarationStatementKind(kind) {
-        return kind === 234
-            || kind === 253
-            || kind === 235
-            || kind === 236
-            || kind === 237
-            || kind === 238
-            || kind === 239
-            || kind === 244
-            || kind === 243
-            || kind === 250
-            || kind === 249
-            || kind === 242;
+        return kind === 234 /* FunctionDeclaration */
+            || kind === 253 /* MissingDeclaration */
+            || kind === 235 /* ClassDeclaration */
+            || kind === 236 /* InterfaceDeclaration */
+            || kind === 237 /* TypeAliasDeclaration */
+            || kind === 238 /* EnumDeclaration */
+            || kind === 239 /* ModuleDeclaration */
+            || kind === 244 /* ImportDeclaration */
+            || kind === 243 /* ImportEqualsDeclaration */
+            || kind === 250 /* ExportDeclaration */
+            || kind === 249 /* ExportAssignment */
+            || kind === 242 /* NamespaceExportDeclaration */;
     }
     function isStatementKindButNotDeclarationKind(kind) {
-        return kind === 224
-            || kind === 223
-            || kind === 231
-            || kind === 218
-            || kind === 216
-            || kind === 215
-            || kind === 221
-            || kind === 222
-            || kind === 220
-            || kind === 217
-            || kind === 228
-            || kind === 225
-            || kind === 227
-            || kind === 229
-            || kind === 230
-            || kind === 214
-            || kind === 219
-            || kind === 226
-            || kind === 300
-            || kind === 304
-            || kind === 303;
+        return kind === 224 /* BreakStatement */
+            || kind === 223 /* ContinueStatement */
+            || kind === 231 /* DebuggerStatement */
+            || kind === 218 /* DoStatement */
+            || kind === 216 /* ExpressionStatement */
+            || kind === 215 /* EmptyStatement */
+            || kind === 221 /* ForInStatement */
+            || kind === 222 /* ForOfStatement */
+            || kind === 220 /* ForStatement */
+            || kind === 217 /* IfStatement */
+            || kind === 228 /* LabeledStatement */
+            || kind === 225 /* ReturnStatement */
+            || kind === 227 /* SwitchStatement */
+            || kind === 229 /* ThrowStatement */
+            || kind === 230 /* TryStatement */
+            || kind === 214 /* VariableStatement */
+            || kind === 219 /* WhileStatement */
+            || kind === 226 /* WithStatement */
+            || kind === 300 /* NotEmittedStatement */
+            || kind === 304 /* EndOfDeclarationMarker */
+            || kind === 303 /* MergeDeclarationMarker */;
     }
+    /* @internal */
     function isDeclaration(node) {
-        if (node.kind === 148) {
-            return node.parent.kind !== 296 || ts.isInJavaScriptFile(node);
+        if (node.kind === 148 /* TypeParameter */) {
+            return node.parent.kind !== 296 /* JSDocTemplateTag */ || ts.isInJavaScriptFile(node);
         }
         return isDeclarationKind(node.kind);
     }
     ts.isDeclaration = isDeclaration;
+    /* @internal */
     function isDeclarationStatement(node) {
         return isDeclarationStatementKind(node.kind);
     }
     ts.isDeclarationStatement = isDeclarationStatement;
+    /**
+     * Determines whether the node is a statement that is not also a declaration
+     */
+    /* @internal */
     function isStatementButNotDeclaration(node) {
         return isStatementKindButNotDeclarationKind(node.kind);
     }
     ts.isStatementButNotDeclaration = isStatementButNotDeclaration;
+    /* @internal */
     function isStatement(node) {
         var kind = node.kind;
         return isStatementKindButNotDeclarationKind(kind)
@@ -9920,156 +13499,183 @@ var ts;
     }
     ts.isStatement = isStatement;
     function isBlockStatement(node) {
-        if (node.kind !== 213)
+        if (node.kind !== 213 /* Block */)
             return false;
         if (node.parent !== undefined) {
-            if (node.parent.kind === 230 || node.parent.kind === 269) {
+            if (node.parent.kind === 230 /* TryStatement */ || node.parent.kind === 269 /* CatchClause */) {
                 return false;
             }
         }
         return !ts.isFunctionBlock(node);
     }
+    // Module references
+    /* @internal */
     function isModuleReference(node) {
         var kind = node.kind;
-        return kind === 254
-            || kind === 146
-            || kind === 71;
+        return kind === 254 /* ExternalModuleReference */
+            || kind === 146 /* QualifiedName */
+            || kind === 71 /* Identifier */;
     }
     ts.isModuleReference = isModuleReference;
+    // JSX
+    /* @internal */
     function isJsxTagNameExpression(node) {
         var kind = node.kind;
-        return kind === 99
-            || kind === 71
-            || kind === 185;
+        return kind === 99 /* ThisKeyword */
+            || kind === 71 /* Identifier */
+            || kind === 185 /* PropertyAccessExpression */;
     }
     ts.isJsxTagNameExpression = isJsxTagNameExpression;
+    /* @internal */
     function isJsxChild(node) {
         var kind = node.kind;
-        return kind === 255
-            || kind === 265
-            || kind === 256
-            || kind === 10
-            || kind === 259;
+        return kind === 255 /* JsxElement */
+            || kind === 265 /* JsxExpression */
+            || kind === 256 /* JsxSelfClosingElement */
+            || kind === 10 /* JsxText */
+            || kind === 259 /* JsxFragment */;
     }
     ts.isJsxChild = isJsxChild;
+    /* @internal */
     function isJsxAttributeLike(node) {
         var kind = node.kind;
-        return kind === 262
-            || kind === 264;
+        return kind === 262 /* JsxAttribute */
+            || kind === 264 /* JsxSpreadAttribute */;
     }
     ts.isJsxAttributeLike = isJsxAttributeLike;
+    /* @internal */
     function isStringLiteralOrJsxExpression(node) {
         var kind = node.kind;
-        return kind === 9
-            || kind === 265;
+        return kind === 9 /* StringLiteral */
+            || kind === 265 /* JsxExpression */;
     }
     ts.isStringLiteralOrJsxExpression = isStringLiteralOrJsxExpression;
     function isJsxOpeningLikeElement(node) {
         var kind = node.kind;
-        return kind === 257
-            || kind === 256;
+        return kind === 257 /* JsxOpeningElement */
+            || kind === 256 /* JsxSelfClosingElement */;
     }
     ts.isJsxOpeningLikeElement = isJsxOpeningLikeElement;
+    // Clauses
     function isCaseOrDefaultClause(node) {
         var kind = node.kind;
-        return kind === 266
-            || kind === 267;
+        return kind === 266 /* CaseClause */
+            || kind === 267 /* DefaultClause */;
     }
     ts.isCaseOrDefaultClause = isCaseOrDefaultClause;
+    // JSDoc
+    /** True if node is of some JSDoc syntax kind. */
+    /* @internal */
     function isJSDocNode(node) {
-        return node.kind >= 278 && node.kind <= 298;
+        return node.kind >= 278 /* FirstJSDocNode */ && node.kind <= 298 /* LastJSDocNode */;
     }
     ts.isJSDocNode = isJSDocNode;
+    /** True if node is of a kind that may contain comment text. */
     function isJSDocCommentContainingNode(node) {
-        return node.kind === 286 || isJSDocTag(node) || ts.isJSDocTypeLiteral(node) || ts.isJSDocSignature(node);
+        return node.kind === 286 /* JSDocComment */ || isJSDocTag(node) || ts.isJSDocTypeLiteral(node) || ts.isJSDocSignature(node);
     }
     ts.isJSDocCommentContainingNode = isJSDocCommentContainingNode;
+    // TODO: determine what this does before making it public.
+    /* @internal */
     function isJSDocTag(node) {
-        return node.kind >= 289 && node.kind <= 298;
+        return node.kind >= 289 /* FirstJSDocTagNode */ && node.kind <= 298 /* LastJSDocTagNode */;
     }
     ts.isJSDocTag = isJSDocTag;
     function isSetAccessor(node) {
-        return node.kind === 157;
+        return node.kind === 157 /* SetAccessor */;
     }
     ts.isSetAccessor = isSetAccessor;
     function isGetAccessor(node) {
-        return node.kind === 156;
+        return node.kind === 156 /* GetAccessor */;
     }
     ts.isGetAccessor = isGetAccessor;
+    /** True if has jsdoc nodes attached to it. */
+    /* @internal */
+    // TODO: GH#19856 Would like to return `node is Node & { jsDoc: JSDoc[] }` but it causes long compile times
     function hasJSDocNodes(node) {
         var jsDoc = node.jsDoc;
         return !!jsDoc && jsDoc.length > 0;
     }
     ts.hasJSDocNodes = hasJSDocNodes;
+    /** True if has type node attached to it. */
+    /* @internal */
     function hasType(node) {
         return !!node.type;
     }
     ts.hasType = hasType;
+    /* True if the node could have a type node a `.type` */
+    /* @internal */
     function couldHaveType(node) {
         switch (node.kind) {
-            case 149:
-            case 151:
-            case 152:
-            case 153:
-            case 154:
-            case 155:
-            case 156:
-            case 157:
-            case 158:
-            case 159:
-            case 160:
-            case 161:
-            case 163:
-            case 164:
-            case 173:
-            case 175:
-            case 177:
-            case 190:
-            case 192:
-            case 193:
-            case 208:
-            case 232:
-            case 234:
-            case 237:
-            case 278:
-            case 281:
-            case 282:
-            case 283:
-            case 284:
-            case 285:
+            case 149 /* Parameter */:
+            case 151 /* PropertySignature */:
+            case 152 /* PropertyDeclaration */:
+            case 153 /* MethodSignature */:
+            case 154 /* MethodDeclaration */:
+            case 155 /* Constructor */:
+            case 156 /* GetAccessor */:
+            case 157 /* SetAccessor */:
+            case 158 /* CallSignature */:
+            case 159 /* ConstructSignature */:
+            case 160 /* IndexSignature */:
+            case 161 /* TypePredicate */:
+            case 163 /* FunctionType */:
+            case 164 /* ConstructorType */:
+            case 173 /* ParenthesizedType */:
+            case 175 /* TypeOperator */:
+            case 177 /* MappedType */:
+            case 190 /* TypeAssertionExpression */:
+            case 192 /* FunctionExpression */:
+            case 193 /* ArrowFunction */:
+            case 208 /* AsExpression */:
+            case 232 /* VariableDeclaration */:
+            case 234 /* FunctionDeclaration */:
+            case 237 /* TypeAliasDeclaration */:
+            case 278 /* JSDocTypeExpression */:
+            case 281 /* JSDocNullableType */:
+            case 282 /* JSDocNonNullableType */:
+            case 283 /* JSDocOptionalType */:
+            case 284 /* JSDocFunctionType */:
+            case 285 /* JSDocVariadicType */:
                 return true;
         }
         return false;
     }
     ts.couldHaveType = couldHaveType;
+    /** True if has initializer node attached to it. */
+    /* @internal */
     function hasInitializer(node) {
         return !!node.initializer;
     }
     ts.hasInitializer = hasInitializer;
+    /** True if has initializer node attached to it. */
+    /* @internal */
     function hasOnlyExpressionInitializer(node) {
         return hasInitializer(node) && !ts.isForStatement(node) && !ts.isForInStatement(node) && !ts.isForOfStatement(node) && !ts.isJsxAttribute(node);
     }
     ts.hasOnlyExpressionInitializer = hasOnlyExpressionInitializer;
     function isObjectLiteralElement(node) {
         switch (node.kind) {
-            case 262:
-            case 264:
-            case 270:
-            case 271:
-            case 154:
-            case 156:
-            case 157:
+            case 262 /* JsxAttribute */:
+            case 264 /* JsxSpreadAttribute */:
+            case 270 /* PropertyAssignment */:
+            case 271 /* ShorthandPropertyAssignment */:
+            case 154 /* MethodDeclaration */:
+            case 156 /* GetAccessor */:
+            case 157 /* SetAccessor */:
                 return true;
             default:
                 return false;
         }
     }
     ts.isObjectLiteralElement = isObjectLiteralElement;
+    /* @internal */
     function isTypeReferenceType(node) {
-        return node.kind === 162 || node.kind === 207;
+        return node.kind === 162 /* TypeReference */ || node.kind === 207 /* ExpressionWithTypeArguments */;
     }
     ts.isTypeReferenceType = isTypeReferenceType;
     var MAX_SMI_X86 = 1073741823;
+    /* @internal */
     function guessIndentation(lines) {
         var indentation = MAX_SMI_X86;
         for (var _i = 0, lines_1 = lines; _i < lines_1.length; _i++) {
@@ -10094,1720 +13700,1261 @@ var ts;
     }
     ts.guessIndentation = guessIndentation;
     function isStringLiteralLike(node) {
-        return node.kind === 9 || node.kind === 13;
+        return node.kind === 9 /* StringLiteral */ || node.kind === 13 /* NoSubstitutionTemplateLiteral */;
     }
     ts.isStringLiteralLike = isStringLiteralLike;
+    /** @internal */
     function isNamedImportsOrExports(node) {
-        return node.kind === 247 || node.kind === 251;
+        return node.kind === 247 /* NamedImports */ || node.kind === 251 /* NamedExports */;
     }
     ts.isNamedImportsOrExports = isNamedImportsOrExports;
-})(ts || (ts = {}));
-var ts;
-(function (ts) {
-    function tokenIsIdentifierOrKeyword(token) {
-        return token >= 71;
+    function Symbol(flags, name) {
+        this.flags = flags;
+        this.escapedName = name;
+        this.declarations = undefined;
+        this.valueDeclaration = undefined;
+        this.id = undefined;
+        this.mergeId = undefined;
+        this.parent = undefined;
     }
-    ts.tokenIsIdentifierOrKeyword = tokenIsIdentifierOrKeyword;
-    function tokenIsIdentifierOrKeywordOrGreaterThan(token) {
-        return token === 29 || tokenIsIdentifierOrKeyword(token);
-    }
-    ts.tokenIsIdentifierOrKeywordOrGreaterThan = tokenIsIdentifierOrKeywordOrGreaterThan;
-    var textToToken = ts.createMapFromTemplate({
-        "abstract": 117,
-        "any": 119,
-        "as": 118,
-        "boolean": 122,
-        "break": 72,
-        "case": 73,
-        "catch": 74,
-        "class": 75,
-        "continue": 77,
-        "const": 76,
-        "constructor": 123,
-        "debugger": 78,
-        "declare": 124,
-        "default": 79,
-        "delete": 80,
-        "do": 81,
-        "else": 82,
-        "enum": 83,
-        "export": 84,
-        "extends": 85,
-        "false": 86,
-        "finally": 87,
-        "for": 88,
-        "from": 143,
-        "function": 89,
-        "get": 125,
-        "if": 90,
-        "implements": 108,
-        "import": 91,
-        "in": 92,
-        "infer": 126,
-        "instanceof": 93,
-        "interface": 109,
-        "is": 127,
-        "keyof": 128,
-        "let": 110,
-        "module": 129,
-        "namespace": 130,
-        "never": 131,
-        "new": 94,
-        "null": 95,
-        "number": 134,
-        "object": 135,
-        "package": 111,
-        "private": 112,
-        "protected": 113,
-        "public": 114,
-        "readonly": 132,
-        "require": 133,
-        "global": 144,
-        "return": 96,
-        "set": 136,
-        "static": 115,
-        "string": 137,
-        "super": 97,
-        "switch": 98,
-        "symbol": 138,
-        "this": 99,
-        "throw": 100,
-        "true": 101,
-        "try": 102,
-        "type": 139,
-        "typeof": 103,
-        "undefined": 140,
-        "unique": 141,
-        "unknown": 142,
-        "var": 104,
-        "void": 105,
-        "while": 106,
-        "with": 107,
-        "yield": 116,
-        "async": 120,
-        "await": 121,
-        "of": 145,
-        "{": 17,
-        "}": 18,
-        "(": 19,
-        ")": 20,
-        "[": 21,
-        "]": 22,
-        ".": 23,
-        "...": 24,
-        ";": 25,
-        ",": 26,
-        "<": 27,
-        ">": 29,
-        "<=": 30,
-        ">=": 31,
-        "==": 32,
-        "!=": 33,
-        "===": 34,
-        "!==": 35,
-        "=>": 36,
-        "+": 37,
-        "-": 38,
-        "**": 40,
-        "*": 39,
-        "/": 41,
-        "%": 42,
-        "++": 43,
-        "--": 44,
-        "<<": 45,
-        "</": 28,
-        ">>": 46,
-        ">>>": 47,
-        "&": 48,
-        "|": 49,
-        "^": 50,
-        "!": 51,
-        "~": 52,
-        "&&": 53,
-        "||": 54,
-        "?": 55,
-        ":": 56,
-        "=": 58,
-        "+=": 59,
-        "-=": 60,
-        "*=": 61,
-        "**=": 62,
-        "/=": 63,
-        "%=": 64,
-        "<<=": 65,
-        ">>=": 66,
-        ">>>=": 67,
-        "&=": 68,
-        "|=": 69,
-        "^=": 70,
-        "@": 57,
-    });
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11694, 11696, 11702, 11704, 11710, 11712, 11718, 11720, 11726, 11728, 11734, 11736, 11742, 11744, 11775, 11823, 11823, 12293, 12295, 12321, 12335, 12337, 12341, 12344, 12348, 12353, 12438, 12441, 12442, 12445, 12447, 12449, 12538, 12540, 12543, 12549, 12589, 12593, 12686, 12704, 12730, 12784, 12799, 13312, 19893, 19968, 40908, 40960, 42124, 42192, 42237, 42240, 42508, 42512, 42539, 42560, 42607, 42612, 42621, 42623, 42647, 42655, 42737, 42775, 42783, 42786, 42888, 42891, 42894, 42896, 42899, 42912, 42922, 43000, 43047, 43072, 43123, 43136, 43204, 43216, 43225, 43232, 43255, 43259, 43259, 43264, 43309, 43312, 43347, 43360, 43388, 43392, 43456, 43471, 43481, 43520, 43574, 43584, 43597, 43600, 43609, 43616, 43638, 43642, 43643, 43648, 43714, 43739, 43741, 43744, 43759, 43762, 43766, 43777, 43782, 43785, 43790, 43793, 43798, 43808, 43814, 43816, 43822, 43968, 44010, 44012, 44013, 44016, 44025, 44032, 55203, 55216, 55238, 55243, 55291, 63744, 64109, 64112, 64217, 64256, 64262, 64275, 64279, 64285, 64296, 64298, 64310, 64312, 64316, 64318, 64318, 64320, 64321, 64323, 64324, 64326, 64433, 64467, 64829, 64848, 64911, 64914, 64967, 65008, 65019, 65024, 65039, 65056, 65062, 65075, 65076, 65101, 65103, 65136, 65140, 65142, 65276, 65296, 65305, 65313, 65338, 65343, 65343, 65345, 65370, 65382, 65470, 65474, 65479, 65482, 65487, 65490, 65495, 65498, 65500,];
-    function lookupInUnicodeMap(code, map) {
-        if (code < map[0]) {
-            return false;
+    function Type(checker, flags) {
+        this.flags = flags;
+        if (Debug.isDebugging) {
+            this.checker = checker;
         }
-        var lo = 0;
-        var hi = map.length;
-        var mid;
-        while (lo + 1 < hi) {
-            mid = lo + (hi - lo) / 2;
-            mid -= mid % 2;
-            if (map[mid] <= code && code <= map[mid + 1]) {
-                return true;
-            }
-            if (code < map[mid]) {
-                hi = mid;
-            }
-            else {
-                lo = mid + 2;
-            }
+    }
+    function Signature() { } // tslint:disable-line no-empty
+    function Node(kind, pos, end) {
+        this.pos = pos;
+        this.end = end;
+        this.kind = kind;
+        this.id = 0;
+        this.flags = 0 /* None */;
+        this.modifierFlagsCache = 0 /* None */;
+        this.transformFlags = 0 /* None */;
+        this.parent = undefined;
+        this.original = undefined;
+    }
+    function SourceMapSource(fileName, text, skipTrivia) {
+        this.fileName = fileName;
+        this.text = text;
+        this.skipTrivia = skipTrivia || (function (pos) { return pos; });
+    }
+    ts.objectAllocator = {
+        getNodeConstructor: function () { return Node; },
+        getTokenConstructor: function () { return Node; },
+        getIdentifierConstructor: function () { return Node; },
+        getSourceFileConstructor: function () { return Node; },
+        getSymbolConstructor: function () { return Symbol; },
+        getTypeConstructor: function () { return Type; },
+        getSignatureConstructor: function () { return Signature; },
+        getSourceMapSourceConstructor: function () { return SourceMapSource; },
+    };
+    function formatStringFromArgs(text, args, baseIndex) {
+        if (baseIndex === void 0) { baseIndex = 0; }
+        return text.replace(/{(\d+)}/g, function (_match, index) { return Debug.assertDefined(args[+index + baseIndex]); });
+    }
+    ts.formatStringFromArgs = formatStringFromArgs;
+    function getLocaleSpecificMessage(message) {
+        return ts.localizedDiagnosticMessages && ts.localizedDiagnosticMessages[message.key] || message.message;
+    }
+    ts.getLocaleSpecificMessage = getLocaleSpecificMessage;
+    function createFileDiagnostic(file, start, length, message) {
+        Debug.assertGreaterThanOrEqual(start, 0);
+        Debug.assertGreaterThanOrEqual(length, 0);
+        if (file) {
+            Debug.assertLessThanOrEqual(start, file.text.length);
+            Debug.assertLessThanOrEqual(start + length, file.text.length);
         }
-        return false;
-    }
-    function isUnicodeIdentifierStart(code, languageVersion) {
-        return languageVersion >= 1 ?
-            lookupInUnicodeMap(code, unicodeES5IdentifierStart) :
-            lookupInUnicodeMap(code, unicodeES3IdentifierStart);
-    }
-    ts.isUnicodeIdentifierStart = isUnicodeIdentifierStart;
-    function isUnicodeIdentifierPart(code, languageVersion) {
-        return languageVersion >= 1 ?
-            lookupInUnicodeMap(code, unicodeES5IdentifierPart) :
-            lookupInUnicodeMap(code, unicodeES3IdentifierPart);
-    }
-    function makeReverseMap(source) {
-        var result = [];
-        source.forEach(function (value, name) {
-            result[value] = name;
-        });
-        return result;
-    }
-    var tokenStrings = makeReverseMap(textToToken);
-    function tokenToString(t) {
-        return tokenStrings[t];
-    }
-    ts.tokenToString = tokenToString;
-    function stringToToken(s) {
-        return textToToken.get(s);
-    }
-    ts.stringToToken = stringToToken;
-    function computeLineStarts(text) {
-        var result = new Array();
-        var pos = 0;
-        var lineStart = 0;
-        while (pos < text.length) {
-            var ch = text.charCodeAt(pos);
-            pos++;
-            switch (ch) {
-                case 13:
-                    if (text.charCodeAt(pos) === 10) {
-                        pos++;
-                    }
-                case 10:
-                    result.push(lineStart);
-                    lineStart = pos;
-                    break;
-                default:
-                    if (ch > 127 && isLineBreak(ch)) {
-                        result.push(lineStart);
-                        lineStart = pos;
-                    }
-                    break;
-            }
-        }
-        result.push(lineStart);
-        return result;
-    }
-    ts.computeLineStarts = computeLineStarts;
-    function getPositionOfLineAndCharacter(sourceFile, line, character) {
-        return computePositionOfLineAndCharacter(getLineStarts(sourceFile), line, character, sourceFile.text);
-    }
-    ts.getPositionOfLineAndCharacter = getPositionOfLineAndCharacter;
-    function computePositionOfLineAndCharacter(lineStarts, line, character, debugText) {
-        if (line < 0 || line >= lineStarts.length) {
-            ts.Debug.fail("Bad line number. Line: " + line + ", lineStarts.length: " + lineStarts.length + " , line map is correct? " + (debugText !== undefined ? ts.arraysEqual(lineStarts, computeLineStarts(debugText)) : "unknown"));
-        }
-        var res = lineStarts[line] + character;
-        if (line < lineStarts.length - 1) {
-            ts.Debug.assert(res < lineStarts[line + 1]);
-        }
-        else if (debugText !== undefined) {
-            ts.Debug.assert(res <= debugText.length);
-        }
-        return res;
-    }
-    ts.computePositionOfLineAndCharacter = computePositionOfLineAndCharacter;
-    function getLineStarts(sourceFile) {
-        return sourceFile.lineMap || (sourceFile.lineMap = computeLineStarts(sourceFile.text));
-    }
-    ts.getLineStarts = getLineStarts;
-    function computeLineAndCharacterOfPosition(lineStarts, position) {
-        var lineNumber = ts.binarySearch(lineStarts, position, ts.identity, ts.compareValues);
-        if (lineNumber < 0) {
-            lineNumber = ~lineNumber - 1;
-            ts.Debug.assert(lineNumber !== -1, "position cannot precede the beginning of the file");
+        var text = getLocaleSpecificMessage(message);
+        if (arguments.length > 4) {
+            text = formatStringFromArgs(text, arguments, 4);
         }
         return {
-            line: lineNumber,
-            character: position - lineStarts[lineNumber]
+            file: file,
+            start: start,
+            length: length,
+            messageText: text,
+            category: message.category,
+            code: message.code,
+            reportsUnnecessary: message.reportsUnnecessary,
         };
     }
-    ts.computeLineAndCharacterOfPosition = computeLineAndCharacterOfPosition;
-    function getLineAndCharacterOfPosition(sourceFile, position) {
-        return computeLineAndCharacterOfPosition(getLineStarts(sourceFile), position);
-    }
-    ts.getLineAndCharacterOfPosition = getLineAndCharacterOfPosition;
-    function isWhiteSpaceLike(ch) {
-        return isWhiteSpaceSingleLine(ch) || isLineBreak(ch);
-    }
-    ts.isWhiteSpaceLike = isWhiteSpaceLike;
-    function isWhiteSpaceSingleLine(ch) {
-        return ch === 32 ||
-            ch === 9 ||
-            ch === 11 ||
-            ch === 12 ||
-            ch === 160 ||
-            ch === 133 ||
-            ch === 5760 ||
-            ch >= 8192 && ch <= 8203 ||
-            ch === 8239 ||
-            ch === 8287 ||
-            ch === 12288 ||
-            ch === 65279;
-    }
-    ts.isWhiteSpaceSingleLine = isWhiteSpaceSingleLine;
-    function isLineBreak(ch) {
-        return ch === 10 ||
-            ch === 13 ||
-            ch === 8232 ||
-            ch === 8233;
-    }
-    ts.isLineBreak = isLineBreak;
-    function isDigit(ch) {
-        return ch >= 48 && ch <= 57;
-    }
-    function isOctalDigit(ch) {
-        return ch >= 48 && ch <= 55;
-    }
-    ts.isOctalDigit = isOctalDigit;
-    function couldStartTrivia(text, pos) {
-        var ch = text.charCodeAt(pos);
-        switch (ch) {
-            case 13:
-            case 10:
-            case 9:
-            case 11:
-            case 12:
-            case 32:
-            case 47:
-            case 60:
-            case 124:
-            case 61:
-            case 62:
-                return true;
-            case 35:
-                return pos === 0;
-            default:
-                return ch > 127;
+    ts.createFileDiagnostic = createFileDiagnostic;
+    /* @internal */
+    function formatMessage(_dummy, message) {
+        var text = getLocaleSpecificMessage(message);
+        if (arguments.length > 2) {
+            text = formatStringFromArgs(text, arguments, 2);
         }
+        return text;
     }
-    ts.couldStartTrivia = couldStartTrivia;
-    function skipTrivia(text, pos, stopAfterLineBreak, stopAtComments) {
-        if (stopAtComments === void 0) { stopAtComments = false; }
-        if (ts.positionIsSynthesized(pos)) {
-            return pos;
+    ts.formatMessage = formatMessage;
+    function createCompilerDiagnostic(message) {
+        var text = getLocaleSpecificMessage(message);
+        if (arguments.length > 1) {
+            text = formatStringFromArgs(text, arguments, 1);
         }
-        while (true) {
-            var ch = text.charCodeAt(pos);
-            switch (ch) {
-                case 13:
-                    if (text.charCodeAt(pos + 1) === 10) {
-                        pos++;
-                    }
-                case 10:
-                    pos++;
-                    if (stopAfterLineBreak) {
-                        return pos;
-                    }
-                    continue;
-                case 9:
-                case 11:
-                case 12:
-                case 32:
-                    pos++;
-                    continue;
-                case 47:
-                    if (stopAtComments) {
-                        break;
-                    }
-                    if (text.charCodeAt(pos + 1) === 47) {
-                        pos += 2;
-                        while (pos < text.length) {
-                            if (isLineBreak(text.charCodeAt(pos))) {
-                                break;
-                            }
-                            pos++;
-                        }
-                        continue;
-                    }
-                    if (text.charCodeAt(pos + 1) === 42) {
-                        pos += 2;
-                        while (pos < text.length) {
-                            if (text.charCodeAt(pos) === 42 && text.charCodeAt(pos + 1) === 47) {
-                                pos += 2;
-                                break;
-                            }
-                            pos++;
-                        }
-                        continue;
-                    }
-                    break;
-                case 60:
-                case 124:
-                case 61:
-                case 62:
-                    if (isConflictMarkerTrivia(text, pos)) {
-                        pos = scanConflictMarkerTrivia(text, pos);
-                        continue;
-                    }
-                    break;
-                case 35:
-                    if (pos === 0 && isShebangTrivia(text, pos)) {
-                        pos = scanShebangTrivia(text, pos);
-                        continue;
-                    }
-                    break;
-                default:
-                    if (ch > 127 && (isWhiteSpaceLike(ch))) {
-                        pos++;
-                        continue;
-                    }
-                    break;
+        return {
+            file: undefined,
+            start: undefined,
+            length: undefined,
+            messageText: text,
+            category: message.category,
+            code: message.code,
+            reportsUnnecessary: message.reportsUnnecessary,
+        };
+    }
+    ts.createCompilerDiagnostic = createCompilerDiagnostic;
+    function createCompilerDiagnosticFromMessageChain(chain) {
+        return {
+            file: undefined,
+            start: undefined,
+            length: undefined,
+            code: chain.code,
+            category: chain.category,
+            messageText: chain.next ? chain : chain.messageText,
+        };
+    }
+    ts.createCompilerDiagnosticFromMessageChain = createCompilerDiagnosticFromMessageChain;
+    function chainDiagnosticMessages(details, message) {
+        var text = getLocaleSpecificMessage(message);
+        if (arguments.length > 2) {
+            text = formatStringFromArgs(text, arguments, 2);
+        }
+        return {
+            messageText: text,
+            category: message.category,
+            code: message.code,
+            next: details
+        };
+    }
+    ts.chainDiagnosticMessages = chainDiagnosticMessages;
+    function concatenateDiagnosticMessageChains(headChain, tailChain) {
+        var lastChain = headChain;
+        while (lastChain.next) {
+            lastChain = lastChain.next;
+        }
+        lastChain.next = tailChain;
+        return headChain;
+    }
+    ts.concatenateDiagnosticMessageChains = concatenateDiagnosticMessageChains;
+    function getDiagnosticFilePath(diagnostic) {
+        return diagnostic.file ? diagnostic.file.path : undefined;
+    }
+    function compareDiagnostics(d1, d2) {
+        return ts.compareStringsCaseSensitive(getDiagnosticFilePath(d1), getDiagnosticFilePath(d2)) ||
+            ts.compareValues(d1.start, d2.start) ||
+            ts.compareValues(d1.length, d2.length) ||
+            ts.compareValues(d1.code, d2.code) ||
+            compareMessageText(d1.messageText, d2.messageText) ||
+            0 /* EqualTo */;
+    }
+    ts.compareDiagnostics = compareDiagnostics;
+    function compareMessageText(t1, t2) {
+        var text1 = t1;
+        var text2 = t2;
+        while (text1 && text2) {
+            // We still have both chains.
+            var string1 = ts.isString(text1) ? text1 : text1.messageText;
+            var string2 = ts.isString(text2) ? text2 : text2.messageText;
+            var res = ts.compareStringsCaseSensitive(string1, string2);
+            if (res) {
+                return res;
             }
-            return pos;
+            text1 = ts.isString(text1) ? undefined : text1.next;
+            text2 = ts.isString(text2) ? undefined : text2.next;
         }
+        if (!text1 && !text2) {
+            // if the chains are done, then these messages are the same.
+            return 0 /* EqualTo */;
+        }
+        // We still have one chain remaining.  The shorter chain should come first.
+        return text1 ? 1 /* GreaterThan */ : -1 /* LessThan */;
     }
-    ts.skipTrivia = skipTrivia;
-    var mergeConflictMarkerLength = "<<<<<<<".length;
-    function isConflictMarkerTrivia(text, pos) {
-        ts.Debug.assert(pos >= 0);
-        if (pos === 0 || isLineBreak(text.charCodeAt(pos - 1))) {
-            var ch = text.charCodeAt(pos);
-            if ((pos + mergeConflictMarkerLength) < text.length) {
-                for (var i = 0; i < mergeConflictMarkerLength; i++) {
-                    if (text.charCodeAt(pos + i) !== ch) {
-                        return false;
+    function getEmitScriptTarget(compilerOptions) {
+        return compilerOptions.target || 0 /* ES3 */;
+    }
+    ts.getEmitScriptTarget = getEmitScriptTarget;
+    function getEmitModuleKind(compilerOptions) {
+        return typeof compilerOptions.module === "number" ?
+            compilerOptions.module :
+            getEmitScriptTarget(compilerOptions) >= 2 /* ES2015 */ ? ts.ModuleKind.ES2015 : ts.ModuleKind.CommonJS;
+    }
+    ts.getEmitModuleKind = getEmitModuleKind;
+    function getEmitModuleResolutionKind(compilerOptions) {
+        var moduleResolution = compilerOptions.moduleResolution;
+        if (moduleResolution === undefined) {
+            moduleResolution = getEmitModuleKind(compilerOptions) === ts.ModuleKind.CommonJS ? ts.ModuleResolutionKind.NodeJs : ts.ModuleResolutionKind.Classic;
+        }
+        return moduleResolution;
+    }
+    ts.getEmitModuleResolutionKind = getEmitModuleResolutionKind;
+    function unreachableCodeIsError(options) {
+        return options.allowUnreachableCode === false;
+    }
+    ts.unreachableCodeIsError = unreachableCodeIsError;
+    function unusedLabelIsError(options) {
+        return options.allowUnusedLabels === false;
+    }
+    ts.unusedLabelIsError = unusedLabelIsError;
+    function getAreDeclarationMapsEnabled(options) {
+        return !!(options.declaration && options.declarationMap);
+    }
+    ts.getAreDeclarationMapsEnabled = getAreDeclarationMapsEnabled;
+    function getAllowSyntheticDefaultImports(compilerOptions) {
+        var moduleKind = getEmitModuleKind(compilerOptions);
+        return compilerOptions.allowSyntheticDefaultImports !== undefined
+            ? compilerOptions.allowSyntheticDefaultImports
+            : compilerOptions.esModuleInterop
+                ? moduleKind !== ts.ModuleKind.None && moduleKind < ts.ModuleKind.ES2015
+                : moduleKind === ts.ModuleKind.System;
+    }
+    ts.getAllowSyntheticDefaultImports = getAllowSyntheticDefaultImports;
+    function getEmitDeclarations(compilerOptions) {
+        return !!(compilerOptions.declaration || compilerOptions.composite);
+    }
+    ts.getEmitDeclarations = getEmitDeclarations;
+    function getStrictOptionValue(compilerOptions, flag) {
+        return compilerOptions[flag] === undefined ? !!compilerOptions.strict : !!compilerOptions[flag];
+    }
+    ts.getStrictOptionValue = getStrictOptionValue;
+    function hasZeroOrOneAsteriskCharacter(str) {
+        var seenAsterisk = false;
+        for (var i = 0; i < str.length; i++) {
+            if (str.charCodeAt(i) === 42 /* asterisk */) {
+                if (!seenAsterisk) {
+                    seenAsterisk = true;
+                }
+                else {
+                    // have already seen asterisk
+                    return false;
+                }
+            }
+        }
+        return true;
+    }
+    ts.hasZeroOrOneAsteriskCharacter = hasZeroOrOneAsteriskCharacter;
+    /**
+     * Internally, we represent paths as strings with '/' as the directory separator.
+     * When we make system calls (eg: LanguageServiceHost.getDirectory()),
+     * we expect the host to correctly handle paths in our specified format.
+     */
+    ts.directorySeparator = "/";
+    var altDirectorySeparator = "\\";
+    var urlSchemeSeparator = "://";
+    var backslashRegExp = /\\/g;
+    /**
+     * Normalize path separators.
+     */
+    function normalizeSlashes(path) {
+        return path.replace(backslashRegExp, ts.directorySeparator);
+    }
+    ts.normalizeSlashes = normalizeSlashes;
+    function isVolumeCharacter(charCode) {
+        return (charCode >= 97 /* a */ && charCode <= 122 /* z */) ||
+            (charCode >= 65 /* A */ && charCode <= 90 /* Z */);
+    }
+    function getFileUrlVolumeSeparatorEnd(url, start) {
+        var ch0 = url.charCodeAt(start);
+        if (ch0 === 58 /* colon */)
+            return start + 1;
+        if (ch0 === 37 /* percent */ && url.charCodeAt(start + 1) === 51 /* _3 */) {
+            var ch2 = url.charCodeAt(start + 2);
+            if (ch2 === 97 /* a */ || ch2 === 65 /* A */)
+                return start + 3;
+        }
+        return -1;
+    }
+    /**
+     * Returns length of the root part of a path or URL (i.e. length of "/", "x:/", "//server/share/, file:///user/files").
+     * If the root is part of a URL, the twos-complement of the root length is returned.
+     */
+    function getEncodedRootLength(path) {
+        if (!path)
+            return 0;
+        var ch0 = path.charCodeAt(0);
+        // POSIX or UNC
+        if (ch0 === 47 /* slash */ || ch0 === 92 /* backslash */) {
+            if (path.charCodeAt(1) !== ch0)
+                return 1; // POSIX: "/" (or non-normalized "\")
+            var p1 = path.indexOf(ch0 === 47 /* slash */ ? ts.directorySeparator : altDirectorySeparator, 2);
+            if (p1 < 0)
+                return path.length; // UNC: "//server" or "\\server"
+            return p1 + 1; // UNC: "//server/" or "\\server\"
+        }
+        // DOS
+        if (isVolumeCharacter(ch0) && path.charCodeAt(1) === 58 /* colon */) {
+            var ch2 = path.charCodeAt(2);
+            if (ch2 === 47 /* slash */ || ch2 === 92 /* backslash */)
+                return 3; // DOS: "c:/" or "c:\"
+            if (path.length === 2)
+                return 2; // DOS: "c:" (but not "c:d")
+        }
+        // URL
+        var schemeEnd = path.indexOf(urlSchemeSeparator);
+        if (schemeEnd !== -1) {
+            var authorityStart = schemeEnd + urlSchemeSeparator.length;
+            var authorityEnd = path.indexOf(ts.directorySeparator, authorityStart);
+            if (authorityEnd !== -1) { // URL: "file:///", "file://server/", "file://server/path"
+                // For local "file" URLs, include the leading DOS volume (if present).
+                // Per https://www.ietf.org/rfc/rfc1738.txt, a host of "" or "localhost" is a
+                // special case interpreted as "the machine from which the URL is being interpreted".
+                var scheme = path.slice(0, schemeEnd);
+                var authority = path.slice(authorityStart, authorityEnd);
+                if (scheme === "file" && (authority === "" || authority === "localhost") &&
+                    isVolumeCharacter(path.charCodeAt(authorityEnd + 1))) {
+                    var volumeSeparatorEnd = getFileUrlVolumeSeparatorEnd(path, authorityEnd + 2);
+                    if (volumeSeparatorEnd !== -1) {
+                        if (path.charCodeAt(volumeSeparatorEnd) === 47 /* slash */) {
+                            // URL: "file:///c:/", "file://localhost/c:/", "file:///c%3a/", "file://localhost/c%3a/"
+                            return ~(volumeSeparatorEnd + 1);
+                        }
+                        if (volumeSeparatorEnd === path.length) {
+                            // URL: "file:///c:", "file://localhost/c:", "file:///c$3a", "file://localhost/c%3a"
+                            // but not "file:///c:d" or "file:///c%3ad"
+                            return ~volumeSeparatorEnd;
+                        }
                     }
                 }
-                return ch === 61 ||
-                    text.charCodeAt(pos + mergeConflictMarkerLength) === 32;
+                return ~(authorityEnd + 1); // URL: "file://server/", "http://server/"
             }
+            return ~path.length; // URL: "file://server", "http://server"
         }
-        return false;
+        // relative
+        return 0;
     }
-    function scanConflictMarkerTrivia(text, pos, error) {
-        if (error) {
-            error(ts.Diagnostics.Merge_conflict_marker_encountered, pos, mergeConflictMarkerLength);
-        }
-        var ch = text.charCodeAt(pos);
-        var len = text.length;
-        if (ch === 60 || ch === 62) {
-            while (pos < len && !isLineBreak(text.charCodeAt(pos))) {
-                pos++;
-            }
+    /**
+     * Returns length of the root part of a path or URL (i.e. length of "/", "x:/", "//server/share/, file:///user/files").
+     *
+     * For example:
+     * ```ts
+     * getRootLength("a") === 0                   // ""
+     * getRootLength("/") === 1                   // "/"
+     * getRootLength("c:") === 2                  // "c:"
+     * getRootLength("c:d") === 0                 // ""
+     * getRootLength("c:/") === 3                 // "c:/"
+     * getRootLength("c:\\") === 3                // "c:\\"
+     * getRootLength("//server") === 7            // "//server"
+     * getRootLength("//server/share") === 8      // "//server/"
+     * getRootLength("\\\\server") === 7          // "\\\\server"
+     * getRootLength("\\\\server\\share") === 8   // "\\\\server\\"
+     * getRootLength("file:///path") === 8        // "file:///"
+     * getRootLength("file:///c:") === 10         // "file:///c:"
+     * getRootLength("file:///c:d") === 8         // "file:///"
+     * getRootLength("file:///c:/path") === 11    // "file:///c:/"
+     * getRootLength("file://server") === 13      // "file://server"
+     * getRootLength("file://server/path") === 14 // "file://server/"
+     * getRootLength("http://server") === 13      // "http://server"
+     * getRootLength("http://server/path") === 14 // "http://server/"
+     * ```
+     */
+    function getRootLength(path) {
+        var rootLength = getEncodedRootLength(path);
+        return rootLength < 0 ? ~rootLength : rootLength;
+    }
+    ts.getRootLength = getRootLength;
+    // TODO(rbuckton): replace references with `resolvePath`
+    function normalizePath(path) {
+        return resolvePath(path);
+    }
+    ts.normalizePath = normalizePath;
+    function normalizePathAndParts(path) {
+        path = normalizeSlashes(path);
+        var _a = reducePathComponents(getPathComponents(path)), root = _a[0], parts = _a.slice(1);
+        if (parts.length) {
+            var joinedParts = root + parts.join(ts.directorySeparator);
+            return { path: hasTrailingDirectorySeparator(path) ? ensureTrailingDirectorySeparator(joinedParts) : joinedParts, parts: parts };
         }
         else {
-            ts.Debug.assert(ch === 124 || ch === 61);
-            while (pos < len) {
-                var currentChar = text.charCodeAt(pos);
-                if ((currentChar === 61 || currentChar === 62) && currentChar !== ch && isConflictMarkerTrivia(text, pos)) {
-                    break;
+            return { path: root, parts: parts };
+        }
+    }
+    ts.normalizePathAndParts = normalizePathAndParts;
+    function getDirectoryPath(path) {
+        path = normalizeSlashes(path);
+        // If the path provided is itself the root, then return it.
+        var rootLength = getRootLength(path);
+        if (rootLength === path.length)
+            return path;
+        // return the leading portion of the path up to the last (non-terminal) directory separator
+        // but not including any trailing directory separator.
+        path = removeTrailingDirectorySeparator(path);
+        return path.slice(0, Math.max(rootLength, path.lastIndexOf(ts.directorySeparator)));
+    }
+    ts.getDirectoryPath = getDirectoryPath;
+    function isUrl(path) {
+        return getEncodedRootLength(path) < 0;
+    }
+    ts.isUrl = isUrl;
+    function pathIsRelative(path) {
+        return /^\.\.?($|[\\/])/.test(path);
+    }
+    ts.pathIsRelative = pathIsRelative;
+    /**
+     * Determines whether a path is an absolute path (e.g. starts with `/`, or a dos path
+     * like `c:`, `c:\` or `c:/`).
+     */
+    function isRootedDiskPath(path) {
+        return getEncodedRootLength(path) > 0;
+    }
+    ts.isRootedDiskPath = isRootedDiskPath;
+    /**
+     * Determines whether a path consists only of a path root.
+     */
+    function isDiskPathRoot(path) {
+        var rootLength = getEncodedRootLength(path);
+        return rootLength > 0 && rootLength === path.length;
+    }
+    ts.isDiskPathRoot = isDiskPathRoot;
+    function convertToRelativePath(absoluteOrRelativePath, basePath, getCanonicalFileName) {
+        return !isRootedDiskPath(absoluteOrRelativePath)
+            ? absoluteOrRelativePath
+            : getRelativePathToDirectoryOrUrl(basePath, absoluteOrRelativePath, basePath, getCanonicalFileName, /*isAbsolutePathAnUrl*/ false);
+    }
+    ts.convertToRelativePath = convertToRelativePath;
+    function pathComponents(path, rootLength) {
+        var root = path.substring(0, rootLength);
+        var rest = path.substring(rootLength).split(ts.directorySeparator);
+        if (rest.length && !ts.lastOrUndefined(rest))
+            rest.pop();
+        return [root].concat(rest);
+    }
+    /**
+     * Parse a path into an array containing a root component (at index 0) and zero or more path
+     * components (at indices > 0). The result is not normalized.
+     * If the path is relative, the root component is `""`.
+     * If the path is absolute, the root component includes the first path separator (`/`).
+     */
+    function getPathComponents(path, currentDirectory) {
+        if (currentDirectory === void 0) { currentDirectory = ""; }
+        path = combinePaths(currentDirectory, path);
+        var rootLength = getRootLength(path);
+        return pathComponents(path, rootLength);
+    }
+    ts.getPathComponents = getPathComponents;
+    /**
+     * Reduce an array of path components to a more simplified path by navigating any
+     * `"."` or `".."` entries in the path.
+     */
+    function reducePathComponents(components) {
+        if (!ts.some(components))
+            return [];
+        var reduced = [components[0]];
+        for (var i = 1; i < components.length; i++) {
+            var component = components[i];
+            if (!component)
+                continue;
+            if (component === ".")
+                continue;
+            if (component === "..") {
+                if (reduced.length > 1) {
+                    if (reduced[reduced.length - 1] !== "..") {
+                        reduced.pop();
+                        continue;
+                    }
                 }
-                pos++;
+                else if (reduced[0])
+                    continue;
+            }
+            reduced.push(component);
+        }
+        return reduced;
+    }
+    ts.reducePathComponents = reducePathComponents;
+    /**
+     * Parse a path into an array containing a root component (at index 0) and zero or more path
+     * components (at indices > 0). The result is normalized.
+     * If the path is relative, the root component is `""`.
+     * If the path is absolute, the root component includes the first path separator (`/`).
+     */
+    function getNormalizedPathComponents(path, currentDirectory) {
+        return reducePathComponents(getPathComponents(path, currentDirectory));
+    }
+    ts.getNormalizedPathComponents = getNormalizedPathComponents;
+    function getNormalizedAbsolutePath(fileName, currentDirectory) {
+        return getPathFromPathComponents(getNormalizedPathComponents(fileName, currentDirectory));
+    }
+    ts.getNormalizedAbsolutePath = getNormalizedAbsolutePath;
+    /**
+     * Formats a parsed path consisting of a root component (at index 0) and zero or more path
+     * segments (at indices > 0).
+     */
+    function getPathFromPathComponents(pathComponents) {
+        if (pathComponents.length === 0)
+            return "";
+        var root = pathComponents[0] && ensureTrailingDirectorySeparator(pathComponents[0]);
+        if (pathComponents.length === 1)
+            return root;
+        return root + pathComponents.slice(1).join(ts.directorySeparator);
+    }
+    ts.getPathFromPathComponents = getPathFromPathComponents;
+    function getPathComponentsRelativeTo(from, to, stringEqualityComparer, getCanonicalFileName) {
+        var fromComponents = reducePathComponents(getPathComponents(from));
+        var toComponents = reducePathComponents(getPathComponents(to));
+        var start;
+        for (start = 0; start < fromComponents.length && start < toComponents.length; start++) {
+            var fromComponent = getCanonicalFileName(fromComponents[start]);
+            var toComponent = getCanonicalFileName(toComponents[start]);
+            var comparer = start === 0 ? ts.equateStringsCaseInsensitive : stringEqualityComparer;
+            if (!comparer(fromComponent, toComponent))
+                break;
+        }
+        if (start === 0) {
+            return toComponents;
+        }
+        var components = toComponents.slice(start);
+        var relative = [];
+        for (; start < fromComponents.length; start++) {
+            relative.push("..");
+        }
+        return [""].concat(relative, components);
+    }
+    function getRelativePathFromFile(from, to, getCanonicalFileName) {
+        return ensurePathIsNonModuleName(getRelativePathFromDirectory(getDirectoryPath(from), to, getCanonicalFileName));
+    }
+    ts.getRelativePathFromFile = getRelativePathFromFile;
+    function getRelativePathFromDirectory(fromDirectory, to, getCanonicalFileNameOrIgnoreCase) {
+        Debug.assert((getRootLength(fromDirectory) > 0) === (getRootLength(to) > 0), "Paths must either both be absolute or both be relative");
+        var getCanonicalFileName = typeof getCanonicalFileNameOrIgnoreCase === "function" ? getCanonicalFileNameOrIgnoreCase : ts.identity;
+        var ignoreCase = typeof getCanonicalFileNameOrIgnoreCase === "boolean" ? getCanonicalFileNameOrIgnoreCase : false;
+        var pathComponents = getPathComponentsRelativeTo(fromDirectory, to, ignoreCase ? ts.equateStringsCaseInsensitive : ts.equateStringsCaseSensitive, getCanonicalFileName);
+        return getPathFromPathComponents(pathComponents);
+    }
+    ts.getRelativePathFromDirectory = getRelativePathFromDirectory;
+    function getRelativePathToDirectoryOrUrl(directoryPathOrUrl, relativeOrAbsolutePath, currentDirectory, getCanonicalFileName, isAbsolutePathAnUrl) {
+        var pathComponents = getPathComponentsRelativeTo(resolvePath(currentDirectory, directoryPathOrUrl), resolvePath(currentDirectory, relativeOrAbsolutePath), ts.equateStringsCaseSensitive, getCanonicalFileName);
+        var firstComponent = pathComponents[0];
+        if (isAbsolutePathAnUrl && isRootedDiskPath(firstComponent)) {
+            var prefix = firstComponent.charAt(0) === ts.directorySeparator ? "file://" : "file:///";
+            pathComponents[0] = prefix + firstComponent;
+        }
+        return getPathFromPathComponents(pathComponents);
+    }
+    ts.getRelativePathToDirectoryOrUrl = getRelativePathToDirectoryOrUrl;
+    /**
+     * Ensures a path is either absolute (prefixed with `/` or `c:`) or dot-relative (prefixed
+     * with `./` or `../`) so as not to be confused with an unprefixed module name.
+     */
+    function ensurePathIsNonModuleName(path) {
+        return getRootLength(path) === 0 && !pathIsRelative(path) ? "./" + path : path;
+    }
+    ts.ensurePathIsNonModuleName = ensurePathIsNonModuleName;
+    function getBaseFileName(path, extensions, ignoreCase) {
+        path = normalizeSlashes(path);
+        // if the path provided is itself the root, then it has not file name.
+        var rootLength = getRootLength(path);
+        if (rootLength === path.length)
+            return "";
+        // return the trailing portion of the path starting after the last (non-terminal) directory
+        // separator but not including any trailing directory separator.
+        path = removeTrailingDirectorySeparator(path);
+        var name = path.slice(Math.max(getRootLength(path), path.lastIndexOf(ts.directorySeparator) + 1));
+        var extension = extensions !== undefined && ignoreCase !== undefined ? getAnyExtensionFromPath(name, extensions, ignoreCase) : undefined;
+        return extension ? name.slice(0, name.length - extension.length) : name;
+    }
+    ts.getBaseFileName = getBaseFileName;
+    /**
+     * Combines paths. If a path is absolute, it replaces any previous path.
+     */
+    function combinePaths(path) {
+        var paths = [];
+        for (var _i = 1; _i < arguments.length; _i++) {
+            paths[_i - 1] = arguments[_i];
+        }
+        if (path)
+            path = normalizeSlashes(path);
+        for (var _a = 0, paths_1 = paths; _a < paths_1.length; _a++) {
+            var relativePath = paths_1[_a];
+            if (!relativePath)
+                continue;
+            relativePath = normalizeSlashes(relativePath);
+            if (!path || getRootLength(relativePath) !== 0) {
+                path = relativePath;
+            }
+            else {
+                path = ensureTrailingDirectorySeparator(path) + relativePath;
             }
         }
-        return pos;
+        return path;
     }
-    var shebangTriviaRegex = /^#!.*/;
-    function isShebangTrivia(text, pos) {
-        ts.Debug.assert(pos === 0);
-        return shebangTriviaRegex.test(text);
+    ts.combinePaths = combinePaths;
+    /**
+     * Combines and resolves paths. If a path is absolute, it replaces any previous path. Any
+     * `.` and `..` path components are resolved.
+     */
+    function resolvePath(path) {
+        var paths = [];
+        for (var _i = 1; _i < arguments.length; _i++) {
+            paths[_i - 1] = arguments[_i];
+        }
+        var combined = ts.some(paths) ? combinePaths.apply(void 0, [path].concat(paths)) : normalizeSlashes(path);
+        var normalized = getPathFromPathComponents(reducePathComponents(getPathComponents(combined)));
+        return normalized && hasTrailingDirectorySeparator(combined) ? ensureTrailingDirectorySeparator(normalized) : normalized;
     }
-    function scanShebangTrivia(text, pos) {
-        var shebang = shebangTriviaRegex.exec(text)[0];
-        pos = pos + shebang.length;
-        return pos;
+    ts.resolvePath = resolvePath;
+    /**
+     * Determines whether a path has a trailing separator (`/` or `\\`).
+     */
+    function hasTrailingDirectorySeparator(path) {
+        if (path.length === 0)
+            return false;
+        var ch = path.charCodeAt(path.length - 1);
+        return ch === 47 /* slash */ || ch === 92 /* backslash */;
     }
-    function iterateCommentRanges(reduce, text, pos, trailing, cb, state, initial) {
-        var pendingPos;
-        var pendingEnd;
-        var pendingKind;
-        var pendingHasTrailingNewLine;
-        var hasPendingCommentRange = false;
-        var collecting = trailing || pos === 0;
-        var accumulator = initial;
-        scan: while (pos >= 0 && pos < text.length) {
-            var ch = text.charCodeAt(pos);
-            switch (ch) {
-                case 13:
-                    if (text.charCodeAt(pos + 1) === 10) {
-                        pos++;
-                    }
-                case 10:
-                    pos++;
-                    if (trailing) {
-                        break scan;
-                    }
-                    collecting = true;
-                    if (hasPendingCommentRange) {
-                        pendingHasTrailingNewLine = true;
-                    }
-                    continue;
-                case 9:
-                case 11:
-                case 12:
-                case 32:
-                    pos++;
-                    continue;
-                case 47:
-                    var nextChar = text.charCodeAt(pos + 1);
-                    var hasTrailingNewLine = false;
-                    if (nextChar === 47 || nextChar === 42) {
-                        var kind = nextChar === 47 ? 2 : 3;
-                        var startPos = pos;
-                        pos += 2;
-                        if (nextChar === 47) {
-                            while (pos < text.length) {
-                                if (isLineBreak(text.charCodeAt(pos))) {
-                                    hasTrailingNewLine = true;
-                                    break;
-                                }
-                                pos++;
-                            }
-                        }
-                        else {
-                            while (pos < text.length) {
-                                if (text.charCodeAt(pos) === 42 && text.charCodeAt(pos + 1) === 47) {
-                                    pos += 2;
-                                    break;
-                                }
-                                pos++;
-                            }
-                        }
-                        if (collecting) {
-                            if (hasPendingCommentRange) {
-                                accumulator = cb(pendingPos, pendingEnd, pendingKind, pendingHasTrailingNewLine, state, accumulator);
-                                if (!reduce && accumulator) {
-                                    return accumulator;
-                                }
-                            }
-                            pendingPos = startPos;
-                            pendingEnd = pos;
-                            pendingKind = kind;
-                            pendingHasTrailingNewLine = hasTrailingNewLine;
-                            hasPendingCommentRange = true;
-                        }
-                        continue;
-                    }
-                    break scan;
-                default:
-                    if (ch > 127 && (isWhiteSpaceLike(ch))) {
-                        if (hasPendingCommentRange && isLineBreak(ch)) {
-                            pendingHasTrailingNewLine = true;
-                        }
-                        pos++;
-                        continue;
-                    }
-                    break scan;
+    ts.hasTrailingDirectorySeparator = hasTrailingDirectorySeparator;
+    function removeTrailingDirectorySeparator(path) {
+        if (hasTrailingDirectorySeparator(path)) {
+            return path.substr(0, path.length - 1);
+        }
+        return path;
+    }
+    ts.removeTrailingDirectorySeparator = removeTrailingDirectorySeparator;
+    function ensureTrailingDirectorySeparator(path) {
+        if (!hasTrailingDirectorySeparator(path)) {
+            return path + ts.directorySeparator;
+        }
+        return path;
+    }
+    ts.ensureTrailingDirectorySeparator = ensureTrailingDirectorySeparator;
+    function comparePathsWorker(a, b, componentComparer) {
+        if (a === b)
+            return 0 /* EqualTo */;
+        if (a === undefined)
+            return -1 /* LessThan */;
+        if (b === undefined)
+            return 1 /* GreaterThan */;
+        var aComponents = reducePathComponents(getPathComponents(a));
+        var bComponents = reducePathComponents(getPathComponents(b));
+        var sharedLength = Math.min(aComponents.length, bComponents.length);
+        for (var i = 0; i < sharedLength; i++) {
+            var stringComparer = i === 0 ? ts.compareStringsCaseInsensitive : componentComparer;
+            var result = stringComparer(aComponents[i], bComponents[i]);
+            if (result !== 0 /* EqualTo */) {
+                return result;
             }
         }
-        if (hasPendingCommentRange) {
-            accumulator = cb(pendingPos, pendingEnd, pendingKind, pendingHasTrailingNewLine, state, accumulator);
+        return ts.compareValues(aComponents.length, bComponents.length);
+    }
+    /**
+     * Performs a case-sensitive comparison of two paths.
+     */
+    function comparePathsCaseSensitive(a, b) {
+        return comparePathsWorker(a, b, ts.compareStringsCaseSensitive);
+    }
+    ts.comparePathsCaseSensitive = comparePathsCaseSensitive;
+    /**
+     * Performs a case-insensitive comparison of two paths.
+     */
+    function comparePathsCaseInsensitive(a, b) {
+        return comparePathsWorker(a, b, ts.compareStringsCaseInsensitive);
+    }
+    ts.comparePathsCaseInsensitive = comparePathsCaseInsensitive;
+    function comparePaths(a, b, currentDirectory, ignoreCase) {
+        if (typeof currentDirectory === "string") {
+            a = combinePaths(currentDirectory, a);
+            b = combinePaths(currentDirectory, b);
         }
-        return accumulator;
-    }
-    function forEachLeadingCommentRange(text, pos, cb, state) {
-        return iterateCommentRanges(false, text, pos, false, cb, state);
-    }
-    ts.forEachLeadingCommentRange = forEachLeadingCommentRange;
-    function forEachTrailingCommentRange(text, pos, cb, state) {
-        return iterateCommentRanges(false, text, pos, true, cb, state);
-    }
-    ts.forEachTrailingCommentRange = forEachTrailingCommentRange;
-    function reduceEachLeadingCommentRange(text, pos, cb, state, initial) {
-        return iterateCommentRanges(true, text, pos, false, cb, state, initial);
-    }
-    ts.reduceEachLeadingCommentRange = reduceEachLeadingCommentRange;
-    function reduceEachTrailingCommentRange(text, pos, cb, state, initial) {
-        return iterateCommentRanges(true, text, pos, true, cb, state, initial);
-    }
-    ts.reduceEachTrailingCommentRange = reduceEachTrailingCommentRange;
-    function appendCommentRange(pos, end, kind, hasTrailingNewLine, _state, comments) {
-        if (!comments) {
-            comments = [];
+        else if (typeof currentDirectory === "boolean") {
+            ignoreCase = currentDirectory;
         }
-        comments.push({ kind: kind, pos: pos, end: end, hasTrailingNewLine: hasTrailingNewLine });
-        return comments;
+        return comparePathsWorker(a, b, ts.getStringComparer(ignoreCase));
     }
-    function getLeadingCommentRanges(text, pos) {
-        return reduceEachLeadingCommentRange(text, pos, appendCommentRange, undefined, undefined);
-    }
-    ts.getLeadingCommentRanges = getLeadingCommentRanges;
-    function getTrailingCommentRanges(text, pos) {
-        return reduceEachTrailingCommentRange(text, pos, appendCommentRange, undefined, undefined);
-    }
-    ts.getTrailingCommentRanges = getTrailingCommentRanges;
-    function getShebang(text) {
-        var match = shebangTriviaRegex.exec(text);
-        if (match) {
-            return match[0];
+    ts.comparePaths = comparePaths;
+    function containsPath(parent, child, currentDirectory, ignoreCase) {
+        if (typeof currentDirectory === "string") {
+            parent = combinePaths(currentDirectory, parent);
+            child = combinePaths(currentDirectory, child);
         }
-    }
-    ts.getShebang = getShebang;
-    function isIdentifierStart(ch, languageVersion) {
-        return ch >= 65 && ch <= 90 || ch >= 97 && ch <= 122 ||
-            ch === 36 || ch === 95 ||
-            ch > 127 && isUnicodeIdentifierStart(ch, languageVersion);
-    }
-    ts.isIdentifierStart = isIdentifierStart;
-    function isIdentifierPart(ch, languageVersion) {
-        return ch >= 65 && ch <= 90 || ch >= 97 && ch <= 122 ||
-            ch >= 48 && ch <= 57 || ch === 36 || ch === 95 ||
-            ch > 127 && isUnicodeIdentifierPart(ch, languageVersion);
-    }
-    ts.isIdentifierPart = isIdentifierPart;
-    function isIdentifierText(name, languageVersion) {
-        if (!isIdentifierStart(name.charCodeAt(0), languageVersion)) {
+        else if (typeof currentDirectory === "boolean") {
+            ignoreCase = currentDirectory;
+        }
+        if (parent === undefined || child === undefined)
+            return false;
+        if (parent === child)
+            return true;
+        var parentComponents = reducePathComponents(getPathComponents(parent));
+        var childComponents = reducePathComponents(getPathComponents(child));
+        if (childComponents.length < parentComponents.length) {
             return false;
         }
-        for (var i = 1; i < name.length; i++) {
-            if (!isIdentifierPart(name.charCodeAt(i), languageVersion)) {
+        var componentEqualityComparer = ignoreCase ? ts.equateStringsCaseInsensitive : ts.equateStringsCaseSensitive;
+        for (var i = 0; i < parentComponents.length; i++) {
+            var equalityComparer = i === 0 ? ts.equateStringsCaseInsensitive : componentEqualityComparer;
+            if (!equalityComparer(parentComponents[i], childComponents[i])) {
                 return false;
             }
         }
         return true;
     }
-    ts.isIdentifierText = isIdentifierText;
-    function createScanner(languageVersion, skipTrivia, languageVariant, textInitial, onError, start, length) {
-        if (languageVariant === void 0) { languageVariant = 0; }
-        var text = textInitial;
-        var pos;
-        var end;
-        var startPos;
-        var tokenPos;
-        var token;
-        var tokenValue;
-        var tokenFlags;
-        setText(text, start, length);
-        return {
-            getStartPos: function () { return startPos; },
-            getTextPos: function () { return pos; },
-            getToken: function () { return token; },
-            getTokenPos: function () { return tokenPos; },
-            getTokenText: function () { return text.substring(tokenPos, pos); },
-            getTokenValue: function () { return tokenValue; },
-            hasExtendedUnicodeEscape: function () { return (tokenFlags & 8) !== 0; },
-            hasPrecedingLineBreak: function () { return (tokenFlags & 1) !== 0; },
-            isIdentifier: function () { return token === 71 || token > 107; },
-            isReservedWord: function () { return token >= 72 && token <= 107; },
-            isUnterminated: function () { return (tokenFlags & 4) !== 0; },
-            getTokenFlags: function () { return tokenFlags; },
-            reScanGreaterToken: reScanGreaterToken,
-            reScanSlashToken: reScanSlashToken,
-            reScanTemplateToken: reScanTemplateToken,
-            scanJsxIdentifier: scanJsxIdentifier,
-            scanJsxAttributeValue: scanJsxAttributeValue,
-            reScanJsxToken: reScanJsxToken,
-            scanJsxToken: scanJsxToken,
-            scanJSDocToken: scanJSDocToken,
-            scan: scan,
-            getText: getText,
-            setText: setText,
-            setScriptTarget: setScriptTarget,
-            setLanguageVariant: setLanguageVariant,
-            setOnError: setOnError,
-            setTextPos: setTextPos,
-            tryScan: tryScan,
-            lookAhead: lookAhead,
-            scanRange: scanRange,
-        };
-        function error(message, errPos, length) {
-            if (errPos === void 0) { errPos = pos; }
-            if (onError) {
-                var oldPos = pos;
-                pos = errPos;
-                onError(message, length || 0);
-                pos = oldPos;
-            }
-        }
-        function scanNumberFragment() {
-            var start = pos;
-            var allowSeparator = false;
-            var isPreviousTokenSeparator = false;
-            var result = "";
-            while (true) {
-                var ch = text.charCodeAt(pos);
-                if (ch === 95) {
-                    tokenFlags |= 512;
-                    if (allowSeparator) {
-                        allowSeparator = false;
-                        isPreviousTokenSeparator = true;
-                        result += text.substring(start, pos);
-                    }
-                    else if (isPreviousTokenSeparator) {
-                        error(ts.Diagnostics.Multiple_consecutive_numeric_separators_are_not_permitted, pos, 1);
-                    }
-                    else {
-                        error(ts.Diagnostics.Numeric_separators_are_not_allowed_here, pos, 1);
-                    }
-                    pos++;
-                    start = pos;
-                    continue;
-                }
-                if (isDigit(ch)) {
-                    allowSeparator = true;
-                    isPreviousTokenSeparator = false;
-                    pos++;
-                    continue;
-                }
-                break;
-            }
-            if (text.charCodeAt(pos - 1) === 95) {
-                error(ts.Diagnostics.Numeric_separators_are_not_allowed_here, pos - 1, 1);
-            }
-            return result + text.substring(start, pos);
-        }
-        function scanNumber() {
-            var start = pos;
-            var mainFragment = scanNumberFragment();
-            var decimalFragment;
-            var scientificFragment;
-            if (text.charCodeAt(pos) === 46) {
-                pos++;
-                decimalFragment = scanNumberFragment();
-            }
-            var end = pos;
-            if (text.charCodeAt(pos) === 69 || text.charCodeAt(pos) === 101) {
-                pos++;
-                tokenFlags |= 16;
-                if (text.charCodeAt(pos) === 43 || text.charCodeAt(pos) === 45)
-                    pos++;
-                var preNumericPart = pos;
-                var finalFragment = scanNumberFragment();
-                if (!finalFragment) {
-                    error(ts.Diagnostics.Digit_expected);
-                }
-                else {
-                    scientificFragment = text.substring(end, preNumericPart) + finalFragment;
-                    end = pos;
-                }
-            }
-            if (tokenFlags & 512) {
-                var result = mainFragment;
-                if (decimalFragment) {
-                    result += "." + decimalFragment;
-                }
-                if (scientificFragment) {
-                    result += scientificFragment;
-                }
-                return "" + +result;
-            }
-            else {
-                return "" + +(text.substring(start, end));
-            }
-        }
-        function scanOctalDigits() {
-            var start = pos;
-            while (isOctalDigit(text.charCodeAt(pos))) {
-                pos++;
-            }
-            return +(text.substring(start, pos));
-        }
-        function scanExactNumberOfHexDigits(count, canHaveSeparators) {
-            return scanHexDigits(count, false, canHaveSeparators);
-        }
-        function scanMinimumNumberOfHexDigits(count, canHaveSeparators) {
-            return scanHexDigits(count, true, canHaveSeparators);
-        }
-        function scanHexDigits(minCount, scanAsManyAsPossible, canHaveSeparators) {
-            var digits = 0;
-            var value = 0;
-            var allowSeparator = false;
-            var isPreviousTokenSeparator = false;
-            while (digits < minCount || scanAsManyAsPossible) {
-                var ch = text.charCodeAt(pos);
-                if (canHaveSeparators && ch === 95) {
-                    tokenFlags |= 512;
-                    if (allowSeparator) {
-                        allowSeparator = false;
-                        isPreviousTokenSeparator = true;
-                    }
-                    else if (isPreviousTokenSeparator) {
-                        error(ts.Diagnostics.Multiple_consecutive_numeric_separators_are_not_permitted, pos, 1);
-                    }
-                    else {
-                        error(ts.Diagnostics.Numeric_separators_are_not_allowed_here, pos, 1);
-                    }
-                    pos++;
-                    continue;
-                }
-                allowSeparator = canHaveSeparators;
-                if (ch >= 48 && ch <= 57) {
-                    value = value * 16 + ch - 48;
-                }
-                else if (ch >= 65 && ch <= 70) {
-                    value = value * 16 + ch - 65 + 10;
-                }
-                else if (ch >= 97 && ch <= 102) {
-                    value = value * 16 + ch - 97 + 10;
-                }
-                else {
-                    break;
-                }
-                pos++;
-                digits++;
-                isPreviousTokenSeparator = false;
-            }
-            if (digits < minCount) {
-                value = -1;
-            }
-            if (text.charCodeAt(pos - 1) === 95) {
-                error(ts.Diagnostics.Numeric_separators_are_not_allowed_here, pos - 1, 1);
-            }
-            return value;
-        }
-        function scanString(jsxAttributeString) {
-            if (jsxAttributeString === void 0) { jsxAttributeString = false; }
-            var quote = text.charCodeAt(pos);
-            pos++;
-            var result = "";
-            var start = pos;
-            while (true) {
-                if (pos >= end) {
-                    result += text.substring(start, pos);
-                    tokenFlags |= 4;
-                    error(ts.Diagnostics.Unterminated_string_literal);
-                    break;
-                }
-                var ch = text.charCodeAt(pos);
-                if (ch === quote) {
-                    result += text.substring(start, pos);
-                    pos++;
-                    break;
-                }
-                if (ch === 92 && !jsxAttributeString) {
-                    result += text.substring(start, pos);
-                    result += scanEscapeSequence();
-                    start = pos;
-                    continue;
-                }
-                if (isLineBreak(ch) && !jsxAttributeString) {
-                    result += text.substring(start, pos);
-                    tokenFlags |= 4;
-                    error(ts.Diagnostics.Unterminated_string_literal);
-                    break;
-                }
-                pos++;
-            }
-            return result;
-        }
-        function scanTemplateAndSetTokenValue() {
-            var startedWithBacktick = text.charCodeAt(pos) === 96;
-            pos++;
-            var start = pos;
-            var contents = "";
-            var resultingToken;
-            while (true) {
-                if (pos >= end) {
-                    contents += text.substring(start, pos);
-                    tokenFlags |= 4;
-                    error(ts.Diagnostics.Unterminated_template_literal);
-                    resultingToken = startedWithBacktick ? 13 : 16;
-                    break;
-                }
-                var currChar = text.charCodeAt(pos);
-                if (currChar === 96) {
-                    contents += text.substring(start, pos);
-                    pos++;
-                    resultingToken = startedWithBacktick ? 13 : 16;
-                    break;
-                }
-                if (currChar === 36 && pos + 1 < end && text.charCodeAt(pos + 1) === 123) {
-                    contents += text.substring(start, pos);
-                    pos += 2;
-                    resultingToken = startedWithBacktick ? 14 : 15;
-                    break;
-                }
-                if (currChar === 92) {
-                    contents += text.substring(start, pos);
-                    contents += scanEscapeSequence();
-                    start = pos;
-                    continue;
-                }
-                if (currChar === 13) {
-                    contents += text.substring(start, pos);
-                    pos++;
-                    if (pos < end && text.charCodeAt(pos) === 10) {
-                        pos++;
-                    }
-                    contents += "\n";
-                    start = pos;
-                    continue;
-                }
-                pos++;
-            }
-            ts.Debug.assert(resultingToken !== undefined);
-            tokenValue = contents;
-            return resultingToken;
-        }
-        function scanEscapeSequence() {
-            pos++;
-            if (pos >= end) {
-                error(ts.Diagnostics.Unexpected_end_of_text);
-                return "";
-            }
-            var ch = text.charCodeAt(pos);
-            pos++;
-            switch (ch) {
-                case 48:
-                    return "\0";
-                case 98:
-                    return "\b";
-                case 116:
-                    return "\t";
-                case 110:
-                    return "\n";
-                case 118:
-                    return "\v";
-                case 102:
-                    return "\f";
-                case 114:
-                    return "\r";
-                case 39:
-                    return "\'";
-                case 34:
-                    return "\"";
-                case 117:
-                    if (pos < end && text.charCodeAt(pos) === 123) {
-                        tokenFlags |= 8;
-                        pos++;
-                        return scanExtendedUnicodeEscape();
-                    }
-                    return scanHexadecimalEscape(4);
-                case 120:
-                    return scanHexadecimalEscape(2);
-                case 13:
-                    if (pos < end && text.charCodeAt(pos) === 10) {
-                        pos++;
-                    }
-                case 10:
-                case 8232:
-                case 8233:
-                    return "";
-                default:
-                    return String.fromCharCode(ch);
-            }
-        }
-        function scanHexadecimalEscape(numDigits) {
-            var escapedValue = scanExactNumberOfHexDigits(numDigits, false);
-            if (escapedValue >= 0) {
-                return String.fromCharCode(escapedValue);
-            }
-            else {
-                error(ts.Diagnostics.Hexadecimal_digit_expected);
-                return "";
-            }
-        }
-        function scanExtendedUnicodeEscape() {
-            var escapedValue = scanMinimumNumberOfHexDigits(1, false);
-            var isInvalidExtendedEscape = false;
-            if (escapedValue < 0) {
-                error(ts.Diagnostics.Hexadecimal_digit_expected);
-                isInvalidExtendedEscape = true;
-            }
-            else if (escapedValue > 0x10FFFF) {
-                error(ts.Diagnostics.An_extended_Unicode_escape_value_must_be_between_0x0_and_0x10FFFF_inclusive);
-                isInvalidExtendedEscape = true;
-            }
-            if (pos >= end) {
-                error(ts.Diagnostics.Unexpected_end_of_text);
-                isInvalidExtendedEscape = true;
-            }
-            else if (text.charCodeAt(pos) === 125) {
-                pos++;
-            }
-            else {
-                error(ts.Diagnostics.Unterminated_Unicode_escape_sequence);
-                isInvalidExtendedEscape = true;
-            }
-            if (isInvalidExtendedEscape) {
-                return "";
-            }
-            return utf16EncodeAsString(escapedValue);
-        }
-        function utf16EncodeAsString(codePoint) {
-            ts.Debug.assert(0x0 <= codePoint && codePoint <= 0x10FFFF);
-            if (codePoint <= 65535) {
-                return String.fromCharCode(codePoint);
-            }
-            var codeUnit1 = Math.floor((codePoint - 65536) / 1024) + 0xD800;
-            var codeUnit2 = ((codePoint - 65536) % 1024) + 0xDC00;
-            return String.fromCharCode(codeUnit1, codeUnit2);
-        }
-        function peekUnicodeEscape() {
-            if (pos + 5 < end && text.charCodeAt(pos + 1) === 117) {
-                var start_1 = pos;
-                pos += 2;
-                var value = scanExactNumberOfHexDigits(4, false);
-                pos = start_1;
-                return value;
-            }
-            return -1;
-        }
-        function scanIdentifierParts() {
-            var result = "";
-            var start = pos;
-            while (pos < end) {
-                var ch = text.charCodeAt(pos);
-                if (isIdentifierPart(ch, languageVersion)) {
-                    pos++;
-                }
-                else if (ch === 92) {
-                    ch = peekUnicodeEscape();
-                    if (!(ch >= 0 && isIdentifierPart(ch, languageVersion))) {
-                        break;
-                    }
-                    result += text.substring(start, pos);
-                    result += String.fromCharCode(ch);
-                    pos += 6;
-                    start = pos;
-                }
-                else {
-                    break;
-                }
-            }
-            result += text.substring(start, pos);
-            return result;
-        }
-        function getIdentifierToken() {
-            var len = tokenValue.length;
-            if (len >= 2 && len <= 11) {
-                var ch = tokenValue.charCodeAt(0);
-                if (ch >= 97 && ch <= 122) {
-                    token = textToToken.get(tokenValue);
-                    if (token !== undefined) {
-                        return token;
-                    }
-                }
-            }
-            return token = 71;
-        }
-        function scanBinaryOrOctalDigits(base) {
-            ts.Debug.assert(base === 2 || base === 8, "Expected either base 2 or base 8");
-            var value = 0;
-            var numberOfDigits = 0;
-            var separatorAllowed = false;
-            var isPreviousTokenSeparator = false;
-            while (true) {
-                var ch = text.charCodeAt(pos);
-                if (ch === 95) {
-                    tokenFlags |= 512;
-                    if (separatorAllowed) {
-                        separatorAllowed = false;
-                        isPreviousTokenSeparator = true;
-                    }
-                    else if (isPreviousTokenSeparator) {
-                        error(ts.Diagnostics.Multiple_consecutive_numeric_separators_are_not_permitted, pos, 1);
-                    }
-                    else {
-                        error(ts.Diagnostics.Numeric_separators_are_not_allowed_here, pos, 1);
-                    }
-                    pos++;
-                    continue;
-                }
-                separatorAllowed = true;
-                var valueOfCh = ch - 48;
-                if (!isDigit(ch) || valueOfCh >= base) {
-                    break;
-                }
-                value = value * base + valueOfCh;
-                pos++;
-                numberOfDigits++;
-                isPreviousTokenSeparator = false;
-            }
-            if (numberOfDigits === 0) {
-                return -1;
-            }
-            if (text.charCodeAt(pos - 1) === 95) {
-                error(ts.Diagnostics.Numeric_separators_are_not_allowed_here, pos - 1, 1);
-                return value;
-            }
-            return value;
-        }
-        function scan() {
-            startPos = pos;
-            tokenFlags = 0;
-            while (true) {
-                tokenPos = pos;
-                if (pos >= end) {
-                    return token = 1;
-                }
-                var ch = text.charCodeAt(pos);
-                if (ch === 35 && pos === 0 && isShebangTrivia(text, pos)) {
-                    pos = scanShebangTrivia(text, pos);
-                    if (skipTrivia) {
-                        continue;
-                    }
-                    else {
-                        return token = 6;
-                    }
-                }
-                switch (ch) {
-                    case 10:
-                    case 13:
-                        tokenFlags |= 1;
-                        if (skipTrivia) {
-                            pos++;
-                            continue;
-                        }
-                        else {
-                            if (ch === 13 && pos + 1 < end && text.charCodeAt(pos + 1) === 10) {
-                                pos += 2;
-                            }
-                            else {
-                                pos++;
-                            }
-                            return token = 4;
-                        }
-                    case 9:
-                    case 11:
-                    case 12:
-                    case 32:
-                        if (skipTrivia) {
-                            pos++;
-                            continue;
-                        }
-                        else {
-                            while (pos < end && isWhiteSpaceSingleLine(text.charCodeAt(pos))) {
-                                pos++;
-                            }
-                            return token = 5;
-                        }
-                    case 33:
-                        if (text.charCodeAt(pos + 1) === 61) {
-                            if (text.charCodeAt(pos + 2) === 61) {
-                                return pos += 3, token = 35;
-                            }
-                            return pos += 2, token = 33;
-                        }
-                        pos++;
-                        return token = 51;
-                    case 34:
-                    case 39:
-                        tokenValue = scanString();
-                        return token = 9;
-                    case 96:
-                        return token = scanTemplateAndSetTokenValue();
-                    case 37:
-                        if (text.charCodeAt(pos + 1) === 61) {
-                            return pos += 2, token = 64;
-                        }
-                        pos++;
-                        return token = 42;
-                    case 38:
-                        if (text.charCodeAt(pos + 1) === 38) {
-                            return pos += 2, token = 53;
-                        }
-                        if (text.charCodeAt(pos + 1) === 61) {
-                            return pos += 2, token = 68;
-                        }
-                        pos++;
-                        return token = 48;
-                    case 40:
-                        pos++;
-                        return token = 19;
-                    case 41:
-                        pos++;
-                        return token = 20;
-                    case 42:
-                        if (text.charCodeAt(pos + 1) === 61) {
-                            return pos += 2, token = 61;
-                        }
-                        if (text.charCodeAt(pos + 1) === 42) {
-                            if (text.charCodeAt(pos + 2) === 61) {
-                                return pos += 3, token = 62;
-                            }
-                            return pos += 2, token = 40;
-                        }
-                        pos++;
-                        return token = 39;
-                    case 43:
-                        if (text.charCodeAt(pos + 1) === 43) {
-                            return pos += 2, token = 43;
-                        }
-                        if (text.charCodeAt(pos + 1) === 61) {
-                            return pos += 2, token = 59;
-                        }
-                        pos++;
-                        return token = 37;
-                    case 44:
-                        pos++;
-                        return token = 26;
-                    case 45:
-                        if (text.charCodeAt(pos + 1) === 45) {
-                            return pos += 2, token = 44;
-                        }
-                        if (text.charCodeAt(pos + 1) === 61) {
-                            return pos += 2, token = 60;
-                        }
-                        pos++;
-                        return token = 38;
-                    case 46:
-                        if (isDigit(text.charCodeAt(pos + 1))) {
-                            tokenValue = scanNumber();
-                            return token = 8;
-                        }
-                        if (text.charCodeAt(pos + 1) === 46 && text.charCodeAt(pos + 2) === 46) {
-                            return pos += 3, token = 24;
-                        }
-                        pos++;
-                        return token = 23;
-                    case 47:
-                        if (text.charCodeAt(pos + 1) === 47) {
-                            pos += 2;
-                            while (pos < end) {
-                                if (isLineBreak(text.charCodeAt(pos))) {
-                                    break;
-                                }
-                                pos++;
-                            }
-                            if (skipTrivia) {
-                                continue;
-                            }
-                            else {
-                                return token = 2;
-                            }
-                        }
-                        if (text.charCodeAt(pos + 1) === 42) {
-                            pos += 2;
-                            if (text.charCodeAt(pos) === 42 && text.charCodeAt(pos + 1) !== 47) {
-                                tokenFlags |= 2;
-                            }
-                            var commentClosed = false;
-                            while (pos < end) {
-                                var ch_1 = text.charCodeAt(pos);
-                                if (ch_1 === 42 && text.charCodeAt(pos + 1) === 47) {
-                                    pos += 2;
-                                    commentClosed = true;
-                                    break;
-                                }
-                                if (isLineBreak(ch_1)) {
-                                    tokenFlags |= 1;
-                                }
-                                pos++;
-                            }
-                            if (!commentClosed) {
-                                error(ts.Diagnostics.Asterisk_Slash_expected);
-                            }
-                            if (skipTrivia) {
-                                continue;
-                            }
-                            else {
-                                if (!commentClosed) {
-                                    tokenFlags |= 4;
-                                }
-                                return token = 3;
-                            }
-                        }
-                        if (text.charCodeAt(pos + 1) === 61) {
-                            return pos += 2, token = 63;
-                        }
-                        pos++;
-                        return token = 41;
-                    case 48:
-                        if (pos + 2 < end && (text.charCodeAt(pos + 1) === 88 || text.charCodeAt(pos + 1) === 120)) {
-                            pos += 2;
-                            var value = scanMinimumNumberOfHexDigits(1, true);
-                            if (value < 0) {
-                                error(ts.Diagnostics.Hexadecimal_digit_expected);
-                                value = 0;
-                            }
-                            tokenValue = "" + value;
-                            tokenFlags |= 64;
-                            return token = 8;
-                        }
-                        else if (pos + 2 < end && (text.charCodeAt(pos + 1) === 66 || text.charCodeAt(pos + 1) === 98)) {
-                            pos += 2;
-                            var value = scanBinaryOrOctalDigits(2);
-                            if (value < 0) {
-                                error(ts.Diagnostics.Binary_digit_expected);
-                                value = 0;
-                            }
-                            tokenValue = "" + value;
-                            tokenFlags |= 128;
-                            return token = 8;
-                        }
-                        else if (pos + 2 < end && (text.charCodeAt(pos + 1) === 79 || text.charCodeAt(pos + 1) === 111)) {
-                            pos += 2;
-                            var value = scanBinaryOrOctalDigits(8);
-                            if (value < 0) {
-                                error(ts.Diagnostics.Octal_digit_expected);
-                                value = 0;
-                            }
-                            tokenValue = "" + value;
-                            tokenFlags |= 256;
-                            return token = 8;
-                        }
-                        if (pos + 1 < end && isOctalDigit(text.charCodeAt(pos + 1))) {
-                            tokenValue = "" + scanOctalDigits();
-                            tokenFlags |= 32;
-                            return token = 8;
-                        }
-                    case 49:
-                    case 50:
-                    case 51:
-                    case 52:
-                    case 53:
-                    case 54:
-                    case 55:
-                    case 56:
-                    case 57:
-                        tokenValue = scanNumber();
-                        return token = 8;
-                    case 58:
-                        pos++;
-                        return token = 56;
-                    case 59:
-                        pos++;
-                        return token = 25;
-                    case 60:
-                        if (isConflictMarkerTrivia(text, pos)) {
-                            pos = scanConflictMarkerTrivia(text, pos, error);
-                            if (skipTrivia) {
-                                continue;
-                            }
-                            else {
-                                return token = 7;
-                            }
-                        }
-                        if (text.charCodeAt(pos + 1) === 60) {
-                            if (text.charCodeAt(pos + 2) === 61) {
-                                return pos += 3, token = 65;
-                            }
-                            return pos += 2, token = 45;
-                        }
-                        if (text.charCodeAt(pos + 1) === 61) {
-                            return pos += 2, token = 30;
-                        }
-                        if (languageVariant === 1 &&
-                            text.charCodeAt(pos + 1) === 47 &&
-                            text.charCodeAt(pos + 2) !== 42) {
-                            return pos += 2, token = 28;
-                        }
-                        pos++;
-                        return token = 27;
-                    case 61:
-                        if (isConflictMarkerTrivia(text, pos)) {
-                            pos = scanConflictMarkerTrivia(text, pos, error);
-                            if (skipTrivia) {
-                                continue;
-                            }
-                            else {
-                                return token = 7;
-                            }
-                        }
-                        if (text.charCodeAt(pos + 1) === 61) {
-                            if (text.charCodeAt(pos + 2) === 61) {
-                                return pos += 3, token = 34;
-                            }
-                            return pos += 2, token = 32;
-                        }
-                        if (text.charCodeAt(pos + 1) === 62) {
-                            return pos += 2, token = 36;
-                        }
-                        pos++;
-                        return token = 58;
-                    case 62:
-                        if (isConflictMarkerTrivia(text, pos)) {
-                            pos = scanConflictMarkerTrivia(text, pos, error);
-                            if (skipTrivia) {
-                                continue;
-                            }
-                            else {
-                                return token = 7;
-                            }
-                        }
-                        pos++;
-                        return token = 29;
-                    case 63:
-                        pos++;
-                        return token = 55;
-                    case 91:
-                        pos++;
-                        return token = 21;
-                    case 93:
-                        pos++;
-                        return token = 22;
-                    case 94:
-                        if (text.charCodeAt(pos + 1) === 61) {
-                            return pos += 2, token = 70;
-                        }
-                        pos++;
-                        return token = 50;
-                    case 123:
-                        pos++;
-                        return token = 17;
-                    case 124:
-                        if (isConflictMarkerTrivia(text, pos)) {
-                            pos = scanConflictMarkerTrivia(text, pos, error);
-                            if (skipTrivia) {
-                                continue;
-                            }
-                            else {
-                                return token = 7;
-                            }
-                        }
-                        if (text.charCodeAt(pos + 1) === 124) {
-                            return pos += 2, token = 54;
-                        }
-                        if (text.charCodeAt(pos + 1) === 61) {
-                            return pos += 2, token = 69;
-                        }
-                        pos++;
-                        return token = 49;
-                    case 125:
-                        pos++;
-                        return token = 18;
-                    case 126:
-                        pos++;
-                        return token = 52;
-                    case 64:
-                        pos++;
-                        return token = 57;
-                    case 92:
-                        var cookedChar = peekUnicodeEscape();
-                        if (cookedChar >= 0 && isIdentifierStart(cookedChar, languageVersion)) {
-                            pos += 6;
-                            tokenValue = String.fromCharCode(cookedChar) + scanIdentifierParts();
-                            return token = getIdentifierToken();
-                        }
-                        error(ts.Diagnostics.Invalid_character);
-                        pos++;
-                        return token = 0;
-                    default:
-                        if (isIdentifierStart(ch, languageVersion)) {
-                            pos++;
-                            while (pos < end && isIdentifierPart(ch = text.charCodeAt(pos), languageVersion))
-                                pos++;
-                            tokenValue = text.substring(tokenPos, pos);
-                            if (ch === 92) {
-                                tokenValue += scanIdentifierParts();
-                            }
-                            return token = getIdentifierToken();
-                        }
-                        else if (isWhiteSpaceSingleLine(ch)) {
-                            pos++;
-                            continue;
-                        }
-                        else if (isLineBreak(ch)) {
-                            tokenFlags |= 1;
-                            pos++;
-                            continue;
-                        }
-                        error(ts.Diagnostics.Invalid_character);
-                        pos++;
-                        return token = 0;
-                }
-            }
-        }
-        function reScanGreaterToken() {
-            if (token === 29) {
-                if (text.charCodeAt(pos) === 62) {
-                    if (text.charCodeAt(pos + 1) === 62) {
-                        if (text.charCodeAt(pos + 2) === 61) {
-                            return pos += 3, token = 67;
-                        }
-                        return pos += 2, token = 47;
-                    }
-                    if (text.charCodeAt(pos + 1) === 61) {
-                        return pos += 2, token = 66;
-                    }
-                    pos++;
-                    return token = 46;
-                }
-                if (text.charCodeAt(pos) === 61) {
-                    pos++;
-                    return token = 31;
-                }
-            }
-            return token;
-        }
-        function reScanSlashToken() {
-            if (token === 41 || token === 63) {
-                var p = tokenPos + 1;
-                var inEscape = false;
-                var inCharacterClass = false;
-                while (true) {
-                    if (p >= end) {
-                        tokenFlags |= 4;
-                        error(ts.Diagnostics.Unterminated_regular_expression_literal);
-                        break;
-                    }
-                    var ch = text.charCodeAt(p);
-                    if (isLineBreak(ch)) {
-                        tokenFlags |= 4;
-                        error(ts.Diagnostics.Unterminated_regular_expression_literal);
-                        break;
-                    }
-                    if (inEscape) {
-                        inEscape = false;
-                    }
-                    else if (ch === 47 && !inCharacterClass) {
-                        p++;
-                        break;
-                    }
-                    else if (ch === 91) {
-                        inCharacterClass = true;
-                    }
-                    else if (ch === 92) {
-                        inEscape = true;
-                    }
-                    else if (ch === 93) {
-                        inCharacterClass = false;
-                    }
-                    p++;
-                }
-                while (p < end && isIdentifierPart(text.charCodeAt(p), languageVersion)) {
-                    p++;
-                }
-                pos = p;
-                tokenValue = text.substring(tokenPos, pos);
-                token = 12;
-            }
-            return token;
-        }
-        function reScanTemplateToken() {
-            ts.Debug.assert(token === 18, "'reScanTemplateToken' should only be called on a '}'");
-            pos = tokenPos;
-            return token = scanTemplateAndSetTokenValue();
-        }
-        function reScanJsxToken() {
-            pos = tokenPos = startPos;
-            return token = scanJsxToken();
-        }
-        function scanJsxToken() {
-            startPos = tokenPos = pos;
-            if (pos >= end) {
-                return token = 1;
-            }
-            var char = text.charCodeAt(pos);
-            if (char === 60) {
-                if (text.charCodeAt(pos + 1) === 47) {
-                    pos += 2;
-                    return token = 28;
-                }
-                pos++;
-                return token = 27;
-            }
-            if (char === 123) {
-                pos++;
-                return token = 17;
-            }
-            var firstNonWhitespace = 0;
-            while (pos < end) {
-                char = text.charCodeAt(pos);
-                if (char === 123) {
-                    break;
-                }
-                if (char === 60) {
-                    if (isConflictMarkerTrivia(text, pos)) {
-                        pos = scanConflictMarkerTrivia(text, pos, error);
-                        return token = 7;
-                    }
-                    break;
-                }
-                if (isLineBreak(char) && firstNonWhitespace === 0) {
-                    firstNonWhitespace = -1;
-                }
-                else if (!isWhiteSpaceLike(char)) {
-                    firstNonWhitespace = pos;
-                }
-                pos++;
-            }
-            return firstNonWhitespace === -1 ? 11 : 10;
-        }
-        function scanJsxIdentifier() {
-            if (tokenIsIdentifierOrKeyword(token)) {
-                var firstCharPosition = pos;
-                while (pos < end) {
-                    var ch = text.charCodeAt(pos);
-                    if (ch === 45 || ((firstCharPosition === pos) ? isIdentifierStart(ch, languageVersion) : isIdentifierPart(ch, languageVersion))) {
-                        pos++;
-                    }
-                    else {
-                        break;
-                    }
-                }
-                tokenValue += text.substring(firstCharPosition, pos);
-            }
-            return token;
-        }
-        function scanJsxAttributeValue() {
-            startPos = pos;
-            switch (text.charCodeAt(pos)) {
-                case 34:
-                case 39:
-                    tokenValue = scanString(true);
-                    return token = 9;
-                default:
-                    return scan();
-            }
-        }
-        function scanJSDocToken() {
-            startPos = tokenPos = pos;
-            if (pos >= end) {
-                return token = 1;
-            }
-            var ch = text.charCodeAt(pos);
-            pos++;
-            switch (ch) {
-                case 9:
-                case 11:
-                case 12:
-                case 32:
-                    while (pos < end && isWhiteSpaceSingleLine(text.charCodeAt(pos))) {
-                        pos++;
-                    }
-                    return token = 5;
-                case 64:
-                    return token = 57;
-                case 10:
-                case 13:
-                    return token = 4;
-                case 42:
-                    return token = 39;
-                case 123:
-                    return token = 17;
-                case 125:
-                    return token = 18;
-                case 91:
-                    return token = 21;
-                case 93:
-                    return token = 22;
-                case 60:
-                    return token = 27;
-                case 61:
-                    return token = 58;
-                case 44:
-                    return token = 26;
-                case 46:
-                    return token = 23;
-                case 96:
-                    while (pos < end && text.charCodeAt(pos) !== 96) {
-                        pos++;
-                    }
-                    tokenValue = text.substring(tokenPos + 1, pos);
-                    pos++;
-                    return token = 13;
-            }
-            if (isIdentifierStart(ch, 6)) {
-                while (isIdentifierPart(text.charCodeAt(pos), 6) && pos < end) {
-                    pos++;
-                }
-                tokenValue = text.substring(tokenPos, pos);
-                return token = 71;
-            }
-            else {
-                return token = 0;
-            }
-        }
-        function speculationHelper(callback, isLookahead) {
-            var savePos = pos;
-            var saveStartPos = startPos;
-            var saveTokenPos = tokenPos;
-            var saveToken = token;
-            var saveTokenValue = tokenValue;
-            var saveTokenFlags = tokenFlags;
-            var result = callback();
-            if (!result || isLookahead) {
-                pos = savePos;
-                startPos = saveStartPos;
-                tokenPos = saveTokenPos;
-                token = saveToken;
-                tokenValue = saveTokenValue;
-                tokenFlags = saveTokenFlags;
-            }
-            return result;
-        }
-        function scanRange(start, length, callback) {
-            var saveEnd = end;
-            var savePos = pos;
-            var saveStartPos = startPos;
-            var saveTokenPos = tokenPos;
-            var saveToken = token;
-            var saveTokenValue = tokenValue;
-            var saveTokenFlags = tokenFlags;
-            setText(text, start, length);
-            var result = callback();
-            end = saveEnd;
-            pos = savePos;
-            startPos = saveStartPos;
-            tokenPos = saveTokenPos;
-            token = saveToken;
-            tokenValue = saveTokenValue;
-            tokenFlags = saveTokenFlags;
-            return result;
-        }
-        function lookAhead(callback) {
-            return speculationHelper(callback, true);
-        }
-        function tryScan(callback) {
-            return speculationHelper(callback, false);
-        }
-        function getText() {
-            return text;
-        }
-        function setText(newText, start, length) {
-            text = newText || "";
-            end = length === undefined ? text.length : start + length;
-            setTextPos(start || 0);
-        }
-        function setOnError(errorCallback) {
-            onError = errorCallback;
-        }
-        function setScriptTarget(scriptTarget) {
-            languageVersion = scriptTarget;
-        }
-        function setLanguageVariant(variant) {
-            languageVariant = variant;
-        }
-        function setTextPos(textPos) {
-            ts.Debug.assert(textPos >= 0);
-            pos = textPos;
-            startPos = textPos;
-            tokenPos = textPos;
-            token = 0;
-            tokenValue = undefined;
-            tokenFlags = 0;
+    ts.containsPath = containsPath;
+    function tryRemoveDirectoryPrefix(path, dirPath) {
+        var a = ts.tryRemovePrefix(path, dirPath);
+        if (a === undefined)
+            return undefined;
+        switch (a.charCodeAt(0)) {
+            case 47 /* slash */:
+            case 92 /* backslash */:
+                return a.slice(1);
+            default:
+                return undefined;
         }
     }
-    ts.createScanner = createScanner;
+    ts.tryRemoveDirectoryPrefix = tryRemoveDirectoryPrefix;
+    // Reserved characters, forces escaping of any non-word (or digit), non-whitespace character.
+    // It may be inefficient (we could just match (/[-[\]{}()*+?.,\\^$|#\s]/g), but this is future
+    // proof.
+    var reservedCharacterPattern = /[^\w\s\/]/g;
+    var wildcardCharCodes = [42 /* asterisk */, 63 /* question */];
+    function hasExtension(fileName) {
+        return ts.stringContains(getBaseFileName(fileName), ".");
+    }
+    ts.hasExtension = hasExtension;
+    ts.commonPackageFolders = ["node_modules", "bower_components", "jspm_packages"];
+    var implicitExcludePathRegexPattern = "(?!(" + ts.commonPackageFolders.join("|") + ")(/|$))";
+    var filesMatcher = {
+        /**
+         * Matches any single directory segment unless it is the last segment and a .min.js file
+         * Breakdown:
+         *  [^./]                   # matches everything up to the first . character (excluding directory separators)
+         *  (\\.(?!min\\.js$))?     # matches . characters but not if they are part of the .min.js file extension
+         */
+        singleAsteriskRegexFragment: "([^./]|(\\.(?!min\\.js$))?)*",
+        /**
+         * Regex for the ** wildcard. Matches any number of subdirectories. When used for including
+         * files or directories, does not match subdirectories that start with a . character
+         */
+        doubleAsteriskRegexFragment: "(/" + implicitExcludePathRegexPattern + "[^/.][^/]*)*?",
+        replaceWildcardCharacter: function (match) { return replaceWildcardCharacter(match, filesMatcher.singleAsteriskRegexFragment); }
+    };
+    var directoriesMatcher = {
+        singleAsteriskRegexFragment: "[^/]*",
+        /**
+         * Regex for the ** wildcard. Matches any number of subdirectories. When used for including
+         * files or directories, does not match subdirectories that start with a . character
+         */
+        doubleAsteriskRegexFragment: "(/" + implicitExcludePathRegexPattern + "[^/.][^/]*)*?",
+        replaceWildcardCharacter: function (match) { return replaceWildcardCharacter(match, directoriesMatcher.singleAsteriskRegexFragment); }
+    };
+    var excludeMatcher = {
+        singleAsteriskRegexFragment: "[^/]*",
+        doubleAsteriskRegexFragment: "(/.+?)?",
+        replaceWildcardCharacter: function (match) { return replaceWildcardCharacter(match, excludeMatcher.singleAsteriskRegexFragment); }
+    };
+    var wildcardMatchers = {
+        files: filesMatcher,
+        directories: directoriesMatcher,
+        exclude: excludeMatcher
+    };
+    function getRegularExpressionForWildcard(specs, basePath, usage) {
+        var patterns = getRegularExpressionsForWildcards(specs, basePath, usage);
+        if (!patterns || !patterns.length) {
+            return undefined;
+        }
+        var pattern = patterns.map(function (pattern) { return "(" + pattern + ")"; }).join("|");
+        // If excluding, match "foo/bar/baz...", but if including, only allow "foo".
+        var terminator = usage === "exclude" ? "($|/)" : "$";
+        return "^(" + pattern + ")" + terminator;
+    }
+    ts.getRegularExpressionForWildcard = getRegularExpressionForWildcard;
+    function getRegularExpressionsForWildcards(specs, basePath, usage) {
+        if (specs === undefined || specs.length === 0) {
+            return undefined;
+        }
+        return ts.flatMap(specs, function (spec) {
+            return spec && getSubPatternFromSpec(spec, basePath, usage, wildcardMatchers[usage]);
+        });
+    }
+    /**
+     * An "includes" path "foo" is implicitly a glob "foo/** /*" (without the space) if its last component has no extension,
+     * and does not contain any glob characters itself.
+     */
+    function isImplicitGlob(lastPathComponent) {
+        return !/[.*?]/.test(lastPathComponent);
+    }
+    ts.isImplicitGlob = isImplicitGlob;
+    function getSubPatternFromSpec(spec, basePath, usage, _a) {
+        var singleAsteriskRegexFragment = _a.singleAsteriskRegexFragment, doubleAsteriskRegexFragment = _a.doubleAsteriskRegexFragment, replaceWildcardCharacter = _a.replaceWildcardCharacter;
+        var subpattern = "";
+        var hasWrittenComponent = false;
+        var components = getNormalizedPathComponents(spec, basePath);
+        var lastComponent = ts.last(components);
+        if (usage !== "exclude" && lastComponent === "**") {
+            return undefined;
+        }
+        // getNormalizedPathComponents includes the separator for the root component.
+        // We need to remove to create our regex correctly.
+        components[0] = removeTrailingDirectorySeparator(components[0]);
+        if (isImplicitGlob(lastComponent)) {
+            components.push("**", "*");
+        }
+        var optionalCount = 0;
+        for (var _i = 0, components_1 = components; _i < components_1.length; _i++) {
+            var component = components_1[_i];
+            if (component === "**") {
+                subpattern += doubleAsteriskRegexFragment;
+            }
+            else {
+                if (usage === "directories") {
+                    subpattern += "(";
+                    optionalCount++;
+                }
+                if (hasWrittenComponent) {
+                    subpattern += ts.directorySeparator;
+                }
+                if (usage !== "exclude") {
+                    var componentPattern = "";
+                    // The * and ? wildcards should not match directories or files that start with . if they
+                    // appear first in a component. Dotted directories and files can be included explicitly
+                    // like so: **/.*/.*
+                    if (component.charCodeAt(0) === 42 /* asterisk */) {
+                        componentPattern += "([^./]" + singleAsteriskRegexFragment + ")?";
+                        component = component.substr(1);
+                    }
+                    else if (component.charCodeAt(0) === 63 /* question */) {
+                        componentPattern += "[^./]";
+                        component = component.substr(1);
+                    }
+                    componentPattern += component.replace(reservedCharacterPattern, replaceWildcardCharacter);
+                    // Patterns should not include subfolders like node_modules unless they are
+                    // explicitly included as part of the path.
+                    //
+                    // As an optimization, if the component pattern is the same as the component,
+                    // then there definitely were no wildcard characters and we do not need to
+                    // add the exclusion pattern.
+                    if (componentPattern !== component) {
+                        subpattern += implicitExcludePathRegexPattern;
+                    }
+                    subpattern += componentPattern;
+                }
+                else {
+                    subpattern += component.replace(reservedCharacterPattern, replaceWildcardCharacter);
+                }
+            }
+            hasWrittenComponent = true;
+        }
+        while (optionalCount > 0) {
+            subpattern += ")?";
+            optionalCount--;
+        }
+        return subpattern;
+    }
+    function replaceWildcardCharacter(match, singleAsteriskRegexFragment) {
+        return match === "*" ? singleAsteriskRegexFragment : match === "?" ? "[^/]" : "\\" + match;
+    }
+    /** @param path directory of the tsconfig.json */
+    function getFileMatcherPatterns(path, excludes, includes, useCaseSensitiveFileNames, currentDirectory) {
+        path = normalizePath(path);
+        currentDirectory = normalizePath(currentDirectory);
+        var absolutePath = combinePaths(currentDirectory, path);
+        return {
+            includeFilePatterns: ts.map(getRegularExpressionsForWildcards(includes, absolutePath, "files"), function (pattern) { return "^" + pattern + "$"; }),
+            includeFilePattern: getRegularExpressionForWildcard(includes, absolutePath, "files"),
+            includeDirectoryPattern: getRegularExpressionForWildcard(includes, absolutePath, "directories"),
+            excludePattern: getRegularExpressionForWildcard(excludes, absolutePath, "exclude"),
+            basePaths: getBasePaths(path, includes, useCaseSensitiveFileNames)
+        };
+    }
+    ts.getFileMatcherPatterns = getFileMatcherPatterns;
+    function getRegexFromPattern(pattern, useCaseSensitiveFileNames) {
+        return new RegExp(pattern, useCaseSensitiveFileNames ? "" : "i");
+    }
+    ts.getRegexFromPattern = getRegexFromPattern;
+    /** @param path directory of the tsconfig.json */
+    function matchFiles(path, extensions, excludes, includes, useCaseSensitiveFileNames, currentDirectory, depth, getFileSystemEntries) {
+        path = normalizePath(path);
+        currentDirectory = normalizePath(currentDirectory);
+        var patterns = getFileMatcherPatterns(path, excludes, includes, useCaseSensitiveFileNames, currentDirectory);
+        var includeFileRegexes = patterns.includeFilePatterns && patterns.includeFilePatterns.map(function (pattern) { return getRegexFromPattern(pattern, useCaseSensitiveFileNames); });
+        var includeDirectoryRegex = patterns.includeDirectoryPattern && getRegexFromPattern(patterns.includeDirectoryPattern, useCaseSensitiveFileNames);
+        var excludeRegex = patterns.excludePattern && getRegexFromPattern(patterns.excludePattern, useCaseSensitiveFileNames);
+        // Associate an array of results with each include regex. This keeps results in order of the "include" order.
+        // If there are no "includes", then just put everything in results[0].
+        var results = includeFileRegexes ? includeFileRegexes.map(function () { return []; }) : [[]];
+        for (var _i = 0, _a = patterns.basePaths; _i < _a.length; _i++) {
+            var basePath = _a[_i];
+            visitDirectory(basePath, combinePaths(currentDirectory, basePath), depth);
+        }
+        return ts.flatten(results);
+        function visitDirectory(path, absolutePath, depth) {
+            var _a = getFileSystemEntries(path), files = _a.files, directories = _a.directories;
+            var _loop_1 = function (current) {
+                var name = combinePaths(path, current);
+                var absoluteName = combinePaths(absolutePath, current);
+                if (extensions && !ts.fileExtensionIsOneOf(name, extensions))
+                    return "continue";
+                if (excludeRegex && excludeRegex.test(absoluteName))
+                    return "continue";
+                if (!includeFileRegexes) {
+                    results[0].push(name);
+                }
+                else {
+                    var includeIndex = ts.findIndex(includeFileRegexes, function (re) { return re.test(absoluteName); });
+                    if (includeIndex !== -1) {
+                        results[includeIndex].push(name);
+                    }
+                }
+            };
+            for (var _i = 0, _b = ts.sort(files, ts.compareStringsCaseSensitive); _i < _b.length; _i++) {
+                var current = _b[_i];
+                _loop_1(current);
+            }
+            if (depth !== undefined) {
+                depth--;
+                if (depth === 0) {
+                    return;
+                }
+            }
+            for (var _c = 0, _d = ts.sort(directories, ts.compareStringsCaseSensitive); _c < _d.length; _c++) {
+                var current = _d[_c];
+                var name = combinePaths(path, current);
+                var absoluteName = combinePaths(absolutePath, current);
+                if ((!includeDirectoryRegex || includeDirectoryRegex.test(absoluteName)) &&
+                    (!excludeRegex || !excludeRegex.test(absoluteName))) {
+                    visitDirectory(name, absoluteName, depth);
+                }
+            }
+        }
+    }
+    ts.matchFiles = matchFiles;
+    /**
+     * Computes the unique non-wildcard base paths amongst the provided include patterns.
+     */
+    function getBasePaths(path, includes, useCaseSensitiveFileNames) {
+        // Storage for our results in the form of literal paths (e.g. the paths as written by the user).
+        var basePaths = [path];
+        if (includes) {
+            // Storage for literal base paths amongst the include patterns.
+            var includeBasePaths = [];
+            for (var _i = 0, includes_1 = includes; _i < includes_1.length; _i++) {
+                var include = includes_1[_i];
+                // We also need to check the relative paths by converting them to absolute and normalizing
+                // in case they escape the base path (e.g "..\somedirectory")
+                var absolute = isRootedDiskPath(include) ? include : normalizePath(combinePaths(path, include));
+                // Append the literal and canonical candidate base paths.
+                includeBasePaths.push(getIncludeBasePath(absolute));
+            }
+            // Sort the offsets array using either the literal or canonical path representations.
+            includeBasePaths.sort(ts.getStringComparer(!useCaseSensitiveFileNames));
+            var _loop_2 = function (includeBasePath) {
+                if (ts.every(basePaths, function (basePath) { return !containsPath(basePath, includeBasePath, path, !useCaseSensitiveFileNames); })) {
+                    basePaths.push(includeBasePath);
+                }
+            };
+            // Iterate over each include base path and include unique base paths that are not a
+            // subpath of an existing base path
+            for (var _a = 0, includeBasePaths_1 = includeBasePaths; _a < includeBasePaths_1.length; _a++) {
+                var includeBasePath = includeBasePaths_1[_a];
+                _loop_2(includeBasePath);
+            }
+        }
+        return basePaths;
+    }
+    function getIncludeBasePath(absolute) {
+        var wildcardOffset = ts.indexOfAnyCharCode(absolute, wildcardCharCodes);
+        if (wildcardOffset < 0) {
+            // No "*" or "?" in the path
+            return !hasExtension(absolute)
+                ? absolute
+                : removeTrailingDirectorySeparator(getDirectoryPath(absolute));
+        }
+        return absolute.substring(0, absolute.lastIndexOf(ts.directorySeparator, wildcardOffset));
+    }
+    function ensureScriptKind(fileName, scriptKind) {
+        // Using scriptKind as a condition handles both:
+        // - 'scriptKind' is unspecified and thus it is `undefined`
+        // - 'scriptKind' is set and it is `Unknown` (0)
+        // If the 'scriptKind' is 'undefined' or 'Unknown' then we attempt
+        // to get the ScriptKind from the file name. If it cannot be resolved
+        // from the file name then the default 'TS' script kind is returned.
+        return scriptKind || getScriptKindFromFileName(fileName) || 3 /* TS */;
+    }
+    ts.ensureScriptKind = ensureScriptKind;
+    function getScriptKindFromFileName(fileName) {
+        var ext = fileName.substr(fileName.lastIndexOf("."));
+        switch (ext.toLowerCase()) {
+            case ".js" /* Js */:
+                return 1 /* JS */;
+            case ".jsx" /* Jsx */:
+                return 2 /* JSX */;
+            case ".ts" /* Ts */:
+                return 3 /* TS */;
+            case ".tsx" /* Tsx */:
+                return 4 /* TSX */;
+            case ".json" /* Json */:
+                return 6 /* JSON */;
+            default:
+                return 0 /* Unknown */;
+        }
+    }
+    ts.getScriptKindFromFileName = getScriptKindFromFileName;
+    /**
+     *  List of supported extensions in order of file resolution precedence.
+     */
+    ts.supportedTypeScriptExtensions = [".ts" /* Ts */, ".tsx" /* Tsx */, ".d.ts" /* Dts */];
+    /** Must have ".d.ts" first because if ".ts" goes first, that will be detected as the extension instead of ".d.ts". */
+    ts.supportedTypescriptExtensionsForExtractExtension = [".d.ts" /* Dts */, ".ts" /* Ts */, ".tsx" /* Tsx */];
+    ts.supportedJavascriptExtensions = [".js" /* Js */, ".jsx" /* Jsx */];
+    var allSupportedExtensions = ts.supportedTypeScriptExtensions.concat(ts.supportedJavascriptExtensions);
+    function getSupportedExtensions(options, extraFileExtensions) {
+        var needJsExtensions = options && options.allowJs;
+        if (!extraFileExtensions || extraFileExtensions.length === 0) {
+            return needJsExtensions ? allSupportedExtensions : ts.supportedTypeScriptExtensions;
+        }
+        var extensions = (needJsExtensions ? allSupportedExtensions : ts.supportedTypeScriptExtensions).concat(ts.mapDefined(extraFileExtensions, function (x) { return x.scriptKind === 7 /* Deferred */ || needJsExtensions && isJavaScriptLike(x.scriptKind) ? x.extension : undefined; }));
+        return ts.deduplicate(extensions, ts.equateStringsCaseSensitive, ts.compareStringsCaseSensitive);
+    }
+    ts.getSupportedExtensions = getSupportedExtensions;
+    function isJavaScriptLike(scriptKind) {
+        return scriptKind === 1 /* JS */ || scriptKind === 2 /* JSX */;
+    }
+    function hasJavaScriptFileExtension(fileName) {
+        return ts.some(ts.supportedJavascriptExtensions, function (extension) { return ts.fileExtensionIs(fileName, extension); });
+    }
+    ts.hasJavaScriptFileExtension = hasJavaScriptFileExtension;
+    function hasTypeScriptFileExtension(fileName) {
+        return ts.some(ts.supportedTypeScriptExtensions, function (extension) { return ts.fileExtensionIs(fileName, extension); });
+    }
+    ts.hasTypeScriptFileExtension = hasTypeScriptFileExtension;
+    function isSupportedSourceFileName(fileName, compilerOptions, extraFileExtensions) {
+        if (!fileName) {
+            return false;
+        }
+        for (var _i = 0, _a = getSupportedExtensions(compilerOptions, extraFileExtensions); _i < _a.length; _i++) {
+            var extension = _a[_i];
+            if (ts.fileExtensionIs(fileName, extension)) {
+                return true;
+            }
+        }
+        return false;
+    }
+    ts.isSupportedSourceFileName = isSupportedSourceFileName;
+    /**
+     * Extension boundaries by priority. Lower numbers indicate higher priorities, and are
+     * aligned to the offset of the highest priority extension in the
+     * allSupportedExtensions array.
+     */
+    var ExtensionPriority;
+    (function (ExtensionPriority) {
+        ExtensionPriority[ExtensionPriority["TypeScriptFiles"] = 0] = "TypeScriptFiles";
+        ExtensionPriority[ExtensionPriority["DeclarationAndJavaScriptFiles"] = 2] = "DeclarationAndJavaScriptFiles";
+        ExtensionPriority[ExtensionPriority["Highest"] = 0] = "Highest";
+        ExtensionPriority[ExtensionPriority["Lowest"] = 2] = "Lowest";
+    })(ExtensionPriority = ts.ExtensionPriority || (ts.ExtensionPriority = {}));
+    function getExtensionPriority(path, supportedExtensions) {
+        for (var i = supportedExtensions.length - 1; i >= 0; i--) {
+            if (ts.fileExtensionIs(path, supportedExtensions[i])) {
+                return adjustExtensionPriority(i, supportedExtensions);
+            }
+        }
+        // If its not in the list of supported extensions, this is likely a
+        // TypeScript file with a non-ts extension
+        return 0 /* Highest */;
+    }
+    ts.getExtensionPriority = getExtensionPriority;
+    /**
+     * Adjusts an extension priority to be the highest priority within the same range.
+     */
+    function adjustExtensionPriority(extensionPriority, supportedExtensions) {
+        if (extensionPriority < 2 /* DeclarationAndJavaScriptFiles */) {
+            return 0 /* TypeScriptFiles */;
+        }
+        else if (extensionPriority < supportedExtensions.length) {
+            return 2 /* DeclarationAndJavaScriptFiles */;
+        }
+        else {
+            return supportedExtensions.length;
+        }
+    }
+    ts.adjustExtensionPriority = adjustExtensionPriority;
+    /**
+     * Gets the next lowest extension priority for a given priority.
+     */
+    function getNextLowestExtensionPriority(extensionPriority, supportedExtensions) {
+        if (extensionPriority < 2 /* DeclarationAndJavaScriptFiles */) {
+            return 2 /* DeclarationAndJavaScriptFiles */;
+        }
+        else {
+            return supportedExtensions.length;
+        }
+    }
+    ts.getNextLowestExtensionPriority = getNextLowestExtensionPriority;
+    var extensionsToRemove = [".d.ts" /* Dts */, ".ts" /* Ts */, ".js" /* Js */, ".tsx" /* Tsx */, ".jsx" /* Jsx */, ".json" /* Json */];
+    function removeFileExtension(path) {
+        for (var _i = 0, extensionsToRemove_1 = extensionsToRemove; _i < extensionsToRemove_1.length; _i++) {
+            var ext = extensionsToRemove_1[_i];
+            var extensionless = tryRemoveExtension(path, ext);
+            if (extensionless !== undefined) {
+                return extensionless;
+            }
+        }
+        return path;
+    }
+    ts.removeFileExtension = removeFileExtension;
+    function tryRemoveExtension(path, extension) {
+        return ts.fileExtensionIs(path, extension) ? removeExtension(path, extension) : undefined;
+    }
+    ts.tryRemoveExtension = tryRemoveExtension;
+    function removeExtension(path, extension) {
+        return path.substring(0, path.length - extension.length);
+    }
+    ts.removeExtension = removeExtension;
+    function changeExtension(path, newExtension) {
+        return changeAnyExtension(path, newExtension, extensionsToRemove, /*ignoreCase*/ false);
+    }
+    ts.changeExtension = changeExtension;
+    function changeAnyExtension(path, ext, extensions, ignoreCase) {
+        var pathext = extensions !== undefined && ignoreCase !== undefined ? getAnyExtensionFromPath(path, extensions, ignoreCase) : getAnyExtensionFromPath(path);
+        return pathext ? path.slice(0, path.length - pathext.length) + (ts.startsWith(ext, ".") ? ext : "." + ext) : path;
+    }
+    ts.changeAnyExtension = changeAnyExtension;
+    var Debug;
+    (function (Debug) {
+        function showSymbol(symbol) {
+            var symbolFlags = ts.SymbolFlags;
+            return "{ flags: " + (symbolFlags ? showFlags(symbol.flags, symbolFlags) : symbol.flags) + "; declarations: " + ts.map(symbol.declarations, showSyntaxKind) + " }";
+        }
+        Debug.showSymbol = showSymbol;
+        function showFlags(flags, flagsEnum) {
+            var out = [];
+            for (var pow = 0; pow <= 30; pow++) {
+                var n = 1 << pow;
+                if (flags & n) {
+                    out.push(flagsEnum[n]);
+                }
+            }
+            return out.join("|");
+        }
+        function showSyntaxKind(node) {
+            var syntaxKind = ts.SyntaxKind;
+            return syntaxKind ? syntaxKind[node.kind] : node.kind.toString();
+        }
+        Debug.showSyntaxKind = showSyntaxKind;
+    })(Debug = ts.Debug || (ts.Debug = {}));
+    function tryParsePattern(pattern) {
+        // This should be verified outside of here and a proper error thrown.
+        Debug.assert(hasZeroOrOneAsteriskCharacter(pattern));
+        var indexOfStar = pattern.indexOf("*");
+        return indexOfStar === -1 ? undefined : {
+            prefix: pattern.substr(0, indexOfStar),
+            suffix: pattern.substr(indexOfStar + 1)
+        };
+    }
+    ts.tryParsePattern = tryParsePattern;
+    function positionIsSynthesized(pos) {
+        // This is a fast way of testing the following conditions:
+        //  pos === undefined || pos === null || isNaN(pos) || pos < 0;
+        return !(pos >= 0);
+    }
+    ts.positionIsSynthesized = positionIsSynthesized;
+    /** True if an extension is one of the supported TypeScript extensions. */
+    function extensionIsTypeScript(ext) {
+        return ext === ".ts" /* Ts */ || ext === ".tsx" /* Tsx */ || ext === ".d.ts" /* Dts */;
+    }
+    ts.extensionIsTypeScript = extensionIsTypeScript;
+    function resolutionExtensionIsTypeScriptOrJson(ext) {
+        return extensionIsTypeScript(ext) || ext === ".json" /* Json */;
+    }
+    ts.resolutionExtensionIsTypeScriptOrJson = resolutionExtensionIsTypeScriptOrJson;
+    /**
+     * Gets the extension from a path.
+     * Path must have a valid extension.
+     */
+    function extensionFromPath(path) {
+        var ext = tryGetExtensionFromPath(path);
+        return ext !== undefined ? ext : Debug.fail("File " + path + " has unknown extension.");
+    }
+    ts.extensionFromPath = extensionFromPath;
+    function isAnySupportedFileExtension(path) {
+        return tryGetExtensionFromPath(path) !== undefined;
+    }
+    ts.isAnySupportedFileExtension = isAnySupportedFileExtension;
+    function tryGetExtensionFromPath(path) {
+        return ts.find(ts.supportedTypescriptExtensionsForExtractExtension, function (e) { return ts.fileExtensionIs(path, e); }) || ts.find(ts.supportedJavascriptExtensions, function (e) { return ts.fileExtensionIs(path, e); });
+    }
+    ts.tryGetExtensionFromPath = tryGetExtensionFromPath;
+    function getAnyExtensionFromPathWorker(path, extensions, stringEqualityComparer) {
+        if (typeof extensions === "string")
+            extensions = [extensions];
+        for (var _i = 0, extensions_1 = extensions; _i < extensions_1.length; _i++) {
+            var extension = extensions_1[_i];
+            if (!ts.startsWith(extension, "."))
+                extension = "." + extension;
+            if (path.length >= extension.length && path.charAt(path.length - extension.length) === ".") {
+                var pathExtension = path.slice(path.length - extension.length);
+                if (stringEqualityComparer(pathExtension, extension)) {
+                    return pathExtension;
+                }
+            }
+        }
+        return "";
+    }
+    function getAnyExtensionFromPath(path, extensions, ignoreCase) {
+        // Retrieves any string from the final "." onwards from a base file name.
+        // Unlike extensionFromPath, which throws an exception on unrecognized extensions.
+        if (extensions) {
+            return getAnyExtensionFromPathWorker(path, extensions, ignoreCase ? ts.equateStringsCaseInsensitive : ts.equateStringsCaseSensitive);
+        }
+        var baseFileName = getBaseFileName(path);
+        var extensionIndex = baseFileName.lastIndexOf(".");
+        if (extensionIndex >= 0) {
+            return baseFileName.substring(extensionIndex);
+        }
+        return "";
+    }
+    ts.getAnyExtensionFromPath = getAnyExtensionFromPath;
+    function isCheckJsEnabledForFile(sourceFile, compilerOptions) {
+        return sourceFile.checkJsDirective ? sourceFile.checkJsDirective.enabled : compilerOptions.checkJs;
+    }
+    ts.isCheckJsEnabledForFile = isCheckJsEnabledForFile;
+    ts.emptyFileSystemEntries = {
+        files: ts.emptyArray,
+        directories: ts.emptyArray
+    };
+    /**
+     * patternStrings contains both pattern strings (containing "*") and regular strings.
+     * Return an exact match if possible, or a pattern match, or undefined.
+     * (These are verified by verifyCompilerOptions to have 0 or 1 "*" characters.)
+     */
+    function matchPatternOrExact(patternStrings, candidate) {
+        var patterns = [];
+        for (var _i = 0, patternStrings_1 = patternStrings; _i < patternStrings_1.length; _i++) {
+            var patternString = patternStrings_1[_i];
+            var pattern = tryParsePattern(patternString);
+            if (pattern) {
+                patterns.push(pattern);
+            }
+            else if (patternString === candidate) {
+                // pattern was matched as is - no need to search further
+                return patternString;
+            }
+        }
+        return ts.findBestPatternMatch(patterns, function (_) { return _; }, candidate);
+    }
+    ts.matchPatternOrExact = matchPatternOrExact;
 })(ts || (ts = {}));
 var ts;
 (function (ts) {
+    var SignatureFlags;
+    (function (SignatureFlags) {
+        SignatureFlags[SignatureFlags["None"] = 0] = "None";
+        SignatureFlags[SignatureFlags["Yield"] = 1] = "Yield";
+        SignatureFlags[SignatureFlags["Await"] = 2] = "Await";
+        SignatureFlags[SignatureFlags["Type"] = 4] = "Type";
+        SignatureFlags[SignatureFlags["IgnoreMissingOpenBrace"] = 16] = "IgnoreMissingOpenBrace";
+        SignatureFlags[SignatureFlags["JSDoc"] = 32] = "JSDoc";
+    })(SignatureFlags || (SignatureFlags = {}));
+    // tslint:disable variable-name
     var NodeConstructor;
     var TokenConstructor;
     var IdentifierConstructor;
     var SourceFileConstructor;
+    // tslint:enable variable-name
     function createNode(kind, pos, end) {
-        if (kind === 274) {
+        if (kind === 274 /* SourceFile */) {
             return new (SourceFileConstructor || (SourceFileConstructor = ts.objectAllocator.getSourceFileConstructor()))(kind, pos, end);
         }
-        else if (kind === 71) {
+        else if (kind === 71 /* Identifier */) {
             return new (IdentifierConstructor || (IdentifierConstructor = ts.objectAllocator.getIdentifierConstructor()))(kind, pos, end);
         }
         else if (!ts.isNodeKind(kind)) {
@@ -11835,35 +14982,49 @@ var ts;
             }
         }
     }
+    /*@internal*/
     function isJSDocLikeText(text, start) {
-        return text.charCodeAt(start + 1) === 42 &&
-            text.charCodeAt(start + 2) === 42 &&
-            text.charCodeAt(start + 3) !== 47;
+        return text.charCodeAt(start + 1) === 42 /* asterisk */ &&
+            text.charCodeAt(start + 2) === 42 /* asterisk */ &&
+            text.charCodeAt(start + 3) !== 47 /* slash */;
     }
     ts.isJSDocLikeText = isJSDocLikeText;
+    /**
+     * Invokes a callback for each child of the given node. The 'cbNode' callback is invoked for all child nodes
+     * stored in properties. If a 'cbNodes' callback is specified, it is invoked for embedded arrays; otherwise,
+     * embedded arrays are flattened and the 'cbNode' callback is invoked for each element. If a callback returns
+     * a truthy value, iteration stops and that value is returned. Otherwise, undefined is returned.
+     *
+     * @param node a given node to visit its children
+     * @param cbNode a callback to be invoked for all child nodes
+     * @param cbNodes a callback to be invoked for embedded array
+     *
+     * @remarks `forEachChild` must visit the children of a node in the order
+     * that they appear in the source code. The language service depends on this property to locate nodes by position.
+     */
     function forEachChild(node, cbNode, cbNodes) {
-        if (!node || node.kind <= 145) {
+        if (!node || node.kind <= 145 /* LastToken */) {
             return;
         }
         switch (node.kind) {
-            case 146:
+            case 146 /* QualifiedName */:
                 return visitNode(cbNode, node.left) ||
                     visitNode(cbNode, node.right);
-            case 148:
+            case 148 /* TypeParameter */:
                 return visitNode(cbNode, node.name) ||
                     visitNode(cbNode, node.constraint) ||
                     visitNode(cbNode, node.default) ||
                     visitNode(cbNode, node.expression);
-            case 271:
+            case 271 /* ShorthandPropertyAssignment */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.name) ||
                     visitNode(cbNode, node.questionToken) ||
                     visitNode(cbNode, node.equalsToken) ||
                     visitNode(cbNode, node.objectAssignmentInitializer);
-            case 272:
+            case 272 /* SpreadAssignment */:
                 return visitNode(cbNode, node.expression);
-            case 149:
+            case 149 /* Parameter */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.dotDotDotToken) ||
@@ -11871,7 +15032,7 @@ var ts;
                     visitNode(cbNode, node.questionToken) ||
                     visitNode(cbNode, node.type) ||
                     visitNode(cbNode, node.initializer);
-            case 152:
+            case 152 /* PropertyDeclaration */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.name) ||
@@ -11879,51 +15040,51 @@ var ts;
                     visitNode(cbNode, node.exclamationToken) ||
                     visitNode(cbNode, node.type) ||
                     visitNode(cbNode, node.initializer);
-            case 151:
+            case 151 /* PropertySignature */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.name) ||
                     visitNode(cbNode, node.questionToken) ||
                     visitNode(cbNode, node.type) ||
                     visitNode(cbNode, node.initializer);
-            case 270:
+            case 270 /* PropertyAssignment */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.name) ||
                     visitNode(cbNode, node.questionToken) ||
                     visitNode(cbNode, node.initializer);
-            case 232:
+            case 232 /* VariableDeclaration */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.name) ||
                     visitNode(cbNode, node.exclamationToken) ||
                     visitNode(cbNode, node.type) ||
                     visitNode(cbNode, node.initializer);
-            case 182:
+            case 182 /* BindingElement */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.dotDotDotToken) ||
                     visitNode(cbNode, node.propertyName) ||
                     visitNode(cbNode, node.name) ||
                     visitNode(cbNode, node.initializer);
-            case 163:
-            case 164:
-            case 158:
-            case 159:
-            case 160:
+            case 163 /* FunctionType */:
+            case 164 /* ConstructorType */:
+            case 158 /* CallSignature */:
+            case 159 /* ConstructSignature */:
+            case 160 /* IndexSignature */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNodes(cbNode, cbNodes, node.typeParameters) ||
                     visitNodes(cbNode, cbNodes, node.parameters) ||
                     visitNode(cbNode, node.type);
-            case 154:
-            case 153:
-            case 155:
-            case 156:
-            case 157:
-            case 192:
-            case 234:
-            case 193:
+            case 154 /* MethodDeclaration */:
+            case 153 /* MethodSignature */:
+            case 155 /* Constructor */:
+            case 156 /* GetAccessor */:
+            case 157 /* SetAccessor */:
+            case 192 /* FunctionExpression */:
+            case 234 /* FunctionDeclaration */:
+            case 193 /* ArrowFunction */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.asteriskToken) ||
@@ -11934,304 +15095,304 @@ var ts;
                     visitNode(cbNode, node.type) ||
                     visitNode(cbNode, node.equalsGreaterThanToken) ||
                     visitNode(cbNode, node.body);
-            case 162:
+            case 162 /* TypeReference */:
                 return visitNode(cbNode, node.typeName) ||
                     visitNodes(cbNode, cbNodes, node.typeArguments);
-            case 161:
+            case 161 /* TypePredicate */:
                 return visitNode(cbNode, node.parameterName) ||
                     visitNode(cbNode, node.type);
-            case 165:
+            case 165 /* TypeQuery */:
                 return visitNode(cbNode, node.exprName);
-            case 166:
+            case 166 /* TypeLiteral */:
                 return visitNodes(cbNode, cbNodes, node.members);
-            case 167:
+            case 167 /* ArrayType */:
                 return visitNode(cbNode, node.elementType);
-            case 168:
+            case 168 /* TupleType */:
                 return visitNodes(cbNode, cbNodes, node.elementTypes);
-            case 169:
-            case 170:
+            case 169 /* UnionType */:
+            case 170 /* IntersectionType */:
                 return visitNodes(cbNode, cbNodes, node.types);
-            case 171:
+            case 171 /* ConditionalType */:
                 return visitNode(cbNode, node.checkType) ||
                     visitNode(cbNode, node.extendsType) ||
                     visitNode(cbNode, node.trueType) ||
                     visitNode(cbNode, node.falseType);
-            case 172:
+            case 172 /* InferType */:
                 return visitNode(cbNode, node.typeParameter);
-            case 179:
+            case 179 /* ImportType */:
                 return visitNode(cbNode, node.argument) ||
                     visitNode(cbNode, node.qualifier) ||
                     visitNodes(cbNode, cbNodes, node.typeArguments);
-            case 173:
-            case 175:
+            case 173 /* ParenthesizedType */:
+            case 175 /* TypeOperator */:
                 return visitNode(cbNode, node.type);
-            case 176:
+            case 176 /* IndexedAccessType */:
                 return visitNode(cbNode, node.objectType) ||
                     visitNode(cbNode, node.indexType);
-            case 177:
+            case 177 /* MappedType */:
                 return visitNode(cbNode, node.readonlyToken) ||
                     visitNode(cbNode, node.typeParameter) ||
                     visitNode(cbNode, node.questionToken) ||
                     visitNode(cbNode, node.type);
-            case 178:
+            case 178 /* LiteralType */:
                 return visitNode(cbNode, node.literal);
-            case 180:
-            case 181:
+            case 180 /* ObjectBindingPattern */:
+            case 181 /* ArrayBindingPattern */:
                 return visitNodes(cbNode, cbNodes, node.elements);
-            case 183:
+            case 183 /* ArrayLiteralExpression */:
                 return visitNodes(cbNode, cbNodes, node.elements);
-            case 184:
+            case 184 /* ObjectLiteralExpression */:
                 return visitNodes(cbNode, cbNodes, node.properties);
-            case 185:
+            case 185 /* PropertyAccessExpression */:
                 return visitNode(cbNode, node.expression) ||
                     visitNode(cbNode, node.name);
-            case 186:
+            case 186 /* ElementAccessExpression */:
                 return visitNode(cbNode, node.expression) ||
                     visitNode(cbNode, node.argumentExpression);
-            case 187:
-            case 188:
+            case 187 /* CallExpression */:
+            case 188 /* NewExpression */:
                 return visitNode(cbNode, node.expression) ||
                     visitNodes(cbNode, cbNodes, node.typeArguments) ||
                     visitNodes(cbNode, cbNodes, node.arguments);
-            case 189:
+            case 189 /* TaggedTemplateExpression */:
                 return visitNode(cbNode, node.tag) ||
                     visitNodes(cbNode, cbNodes, node.typeArguments) ||
                     visitNode(cbNode, node.template);
-            case 190:
+            case 190 /* TypeAssertionExpression */:
                 return visitNode(cbNode, node.type) ||
                     visitNode(cbNode, node.expression);
-            case 191:
+            case 191 /* ParenthesizedExpression */:
                 return visitNode(cbNode, node.expression);
-            case 194:
+            case 194 /* DeleteExpression */:
                 return visitNode(cbNode, node.expression);
-            case 195:
+            case 195 /* TypeOfExpression */:
                 return visitNode(cbNode, node.expression);
-            case 196:
+            case 196 /* VoidExpression */:
                 return visitNode(cbNode, node.expression);
-            case 198:
+            case 198 /* PrefixUnaryExpression */:
                 return visitNode(cbNode, node.operand);
-            case 203:
+            case 203 /* YieldExpression */:
                 return visitNode(cbNode, node.asteriskToken) ||
                     visitNode(cbNode, node.expression);
-            case 197:
+            case 197 /* AwaitExpression */:
                 return visitNode(cbNode, node.expression);
-            case 199:
+            case 199 /* PostfixUnaryExpression */:
                 return visitNode(cbNode, node.operand);
-            case 200:
+            case 200 /* BinaryExpression */:
                 return visitNode(cbNode, node.left) ||
                     visitNode(cbNode, node.operatorToken) ||
                     visitNode(cbNode, node.right);
-            case 208:
+            case 208 /* AsExpression */:
                 return visitNode(cbNode, node.expression) ||
                     visitNode(cbNode, node.type);
-            case 209:
+            case 209 /* NonNullExpression */:
                 return visitNode(cbNode, node.expression);
-            case 210:
+            case 210 /* MetaProperty */:
                 return visitNode(cbNode, node.name);
-            case 201:
+            case 201 /* ConditionalExpression */:
                 return visitNode(cbNode, node.condition) ||
                     visitNode(cbNode, node.questionToken) ||
                     visitNode(cbNode, node.whenTrue) ||
                     visitNode(cbNode, node.colonToken) ||
                     visitNode(cbNode, node.whenFalse);
-            case 204:
+            case 204 /* SpreadElement */:
                 return visitNode(cbNode, node.expression);
-            case 213:
-            case 240:
+            case 213 /* Block */:
+            case 240 /* ModuleBlock */:
                 return visitNodes(cbNode, cbNodes, node.statements);
-            case 274:
+            case 274 /* SourceFile */:
                 return visitNodes(cbNode, cbNodes, node.statements) ||
                     visitNode(cbNode, node.endOfFileToken);
-            case 214:
+            case 214 /* VariableStatement */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.declarationList);
-            case 233:
+            case 233 /* VariableDeclarationList */:
                 return visitNodes(cbNode, cbNodes, node.declarations);
-            case 216:
+            case 216 /* ExpressionStatement */:
                 return visitNode(cbNode, node.expression);
-            case 217:
+            case 217 /* IfStatement */:
                 return visitNode(cbNode, node.expression) ||
                     visitNode(cbNode, node.thenStatement) ||
                     visitNode(cbNode, node.elseStatement);
-            case 218:
+            case 218 /* DoStatement */:
                 return visitNode(cbNode, node.statement) ||
                     visitNode(cbNode, node.expression);
-            case 219:
+            case 219 /* WhileStatement */:
                 return visitNode(cbNode, node.expression) ||
                     visitNode(cbNode, node.statement);
-            case 220:
+            case 220 /* ForStatement */:
                 return visitNode(cbNode, node.initializer) ||
                     visitNode(cbNode, node.condition) ||
                     visitNode(cbNode, node.incrementor) ||
                     visitNode(cbNode, node.statement);
-            case 221:
+            case 221 /* ForInStatement */:
                 return visitNode(cbNode, node.initializer) ||
                     visitNode(cbNode, node.expression) ||
                     visitNode(cbNode, node.statement);
-            case 222:
+            case 222 /* ForOfStatement */:
                 return visitNode(cbNode, node.awaitModifier) ||
                     visitNode(cbNode, node.initializer) ||
                     visitNode(cbNode, node.expression) ||
                     visitNode(cbNode, node.statement);
-            case 223:
-            case 224:
+            case 223 /* ContinueStatement */:
+            case 224 /* BreakStatement */:
                 return visitNode(cbNode, node.label);
-            case 225:
+            case 225 /* ReturnStatement */:
                 return visitNode(cbNode, node.expression);
-            case 226:
+            case 226 /* WithStatement */:
                 return visitNode(cbNode, node.expression) ||
                     visitNode(cbNode, node.statement);
-            case 227:
+            case 227 /* SwitchStatement */:
                 return visitNode(cbNode, node.expression) ||
                     visitNode(cbNode, node.caseBlock);
-            case 241:
+            case 241 /* CaseBlock */:
                 return visitNodes(cbNode, cbNodes, node.clauses);
-            case 266:
+            case 266 /* CaseClause */:
                 return visitNode(cbNode, node.expression) ||
                     visitNodes(cbNode, cbNodes, node.statements);
-            case 267:
+            case 267 /* DefaultClause */:
                 return visitNodes(cbNode, cbNodes, node.statements);
-            case 228:
+            case 228 /* LabeledStatement */:
                 return visitNode(cbNode, node.label) ||
                     visitNode(cbNode, node.statement);
-            case 229:
+            case 229 /* ThrowStatement */:
                 return visitNode(cbNode, node.expression);
-            case 230:
+            case 230 /* TryStatement */:
                 return visitNode(cbNode, node.tryBlock) ||
                     visitNode(cbNode, node.catchClause) ||
                     visitNode(cbNode, node.finallyBlock);
-            case 269:
+            case 269 /* CatchClause */:
                 return visitNode(cbNode, node.variableDeclaration) ||
                     visitNode(cbNode, node.block);
-            case 150:
+            case 150 /* Decorator */:
                 return visitNode(cbNode, node.expression);
-            case 235:
-            case 205:
+            case 235 /* ClassDeclaration */:
+            case 205 /* ClassExpression */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.name) ||
                     visitNodes(cbNode, cbNodes, node.typeParameters) ||
                     visitNodes(cbNode, cbNodes, node.heritageClauses) ||
                     visitNodes(cbNode, cbNodes, node.members);
-            case 236:
+            case 236 /* InterfaceDeclaration */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.name) ||
                     visitNodes(cbNode, cbNodes, node.typeParameters) ||
                     visitNodes(cbNode, cbNodes, node.heritageClauses) ||
                     visitNodes(cbNode, cbNodes, node.members);
-            case 237:
+            case 237 /* TypeAliasDeclaration */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.name) ||
                     visitNodes(cbNode, cbNodes, node.typeParameters) ||
                     visitNode(cbNode, node.type);
-            case 238:
+            case 238 /* EnumDeclaration */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.name) ||
                     visitNodes(cbNode, cbNodes, node.members);
-            case 273:
+            case 273 /* EnumMember */:
                 return visitNode(cbNode, node.name) ||
                     visitNode(cbNode, node.initializer);
-            case 239:
+            case 239 /* ModuleDeclaration */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.name) ||
                     visitNode(cbNode, node.body);
-            case 243:
+            case 243 /* ImportEqualsDeclaration */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.name) ||
                     visitNode(cbNode, node.moduleReference);
-            case 244:
+            case 244 /* ImportDeclaration */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.importClause) ||
                     visitNode(cbNode, node.moduleSpecifier);
-            case 245:
+            case 245 /* ImportClause */:
                 return visitNode(cbNode, node.name) ||
                     visitNode(cbNode, node.namedBindings);
-            case 242:
+            case 242 /* NamespaceExportDeclaration */:
                 return visitNode(cbNode, node.name);
-            case 246:
+            case 246 /* NamespaceImport */:
                 return visitNode(cbNode, node.name);
-            case 247:
-            case 251:
+            case 247 /* NamedImports */:
+            case 251 /* NamedExports */:
                 return visitNodes(cbNode, cbNodes, node.elements);
-            case 250:
+            case 250 /* ExportDeclaration */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.exportClause) ||
                     visitNode(cbNode, node.moduleSpecifier);
-            case 248:
-            case 252:
+            case 248 /* ImportSpecifier */:
+            case 252 /* ExportSpecifier */:
                 return visitNode(cbNode, node.propertyName) ||
                     visitNode(cbNode, node.name);
-            case 249:
+            case 249 /* ExportAssignment */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNode(cbNode, node.expression);
-            case 202:
+            case 202 /* TemplateExpression */:
                 return visitNode(cbNode, node.head) || visitNodes(cbNode, cbNodes, node.templateSpans);
-            case 211:
+            case 211 /* TemplateSpan */:
                 return visitNode(cbNode, node.expression) || visitNode(cbNode, node.literal);
-            case 147:
+            case 147 /* ComputedPropertyName */:
                 return visitNode(cbNode, node.expression);
-            case 268:
+            case 268 /* HeritageClause */:
                 return visitNodes(cbNode, cbNodes, node.types);
-            case 207:
+            case 207 /* ExpressionWithTypeArguments */:
                 return visitNode(cbNode, node.expression) ||
                     visitNodes(cbNode, cbNodes, node.typeArguments);
-            case 254:
+            case 254 /* ExternalModuleReference */:
                 return visitNode(cbNode, node.expression);
-            case 253:
+            case 253 /* MissingDeclaration */:
                 return visitNodes(cbNode, cbNodes, node.decorators);
-            case 302:
+            case 302 /* CommaListExpression */:
                 return visitNodes(cbNode, cbNodes, node.elements);
-            case 255:
+            case 255 /* JsxElement */:
                 return visitNode(cbNode, node.openingElement) ||
                     visitNodes(cbNode, cbNodes, node.children) ||
                     visitNode(cbNode, node.closingElement);
-            case 259:
+            case 259 /* JsxFragment */:
                 return visitNode(cbNode, node.openingFragment) ||
                     visitNodes(cbNode, cbNodes, node.children) ||
                     visitNode(cbNode, node.closingFragment);
-            case 256:
-            case 257:
+            case 256 /* JsxSelfClosingElement */:
+            case 257 /* JsxOpeningElement */:
                 return visitNode(cbNode, node.tagName) ||
                     visitNodes(cbNode, cbNodes, node.typeArguments) ||
                     visitNode(cbNode, node.attributes);
-            case 263:
+            case 263 /* JsxAttributes */:
                 return visitNodes(cbNode, cbNodes, node.properties);
-            case 262:
+            case 262 /* JsxAttribute */:
                 return visitNode(cbNode, node.name) ||
                     visitNode(cbNode, node.initializer);
-            case 264:
+            case 264 /* JsxSpreadAttribute */:
                 return visitNode(cbNode, node.expression);
-            case 265:
+            case 265 /* JsxExpression */:
                 return visitNode(cbNode, node.dotDotDotToken) ||
                     visitNode(cbNode, node.expression);
-            case 258:
+            case 258 /* JsxClosingElement */:
                 return visitNode(cbNode, node.tagName);
-            case 278:
+            case 278 /* JSDocTypeExpression */:
                 return visitNode(cbNode, node.type);
-            case 282:
+            case 282 /* JSDocNonNullableType */:
                 return visitNode(cbNode, node.type);
-            case 281:
+            case 281 /* JSDocNullableType */:
                 return visitNode(cbNode, node.type);
-            case 283:
+            case 283 /* JSDocOptionalType */:
                 return visitNode(cbNode, node.type);
-            case 284:
+            case 284 /* JSDocFunctionType */:
                 return visitNodes(cbNode, cbNodes, node.parameters) ||
                     visitNode(cbNode, node.type);
-            case 285:
+            case 285 /* JSDocVariadicType */:
                 return visitNode(cbNode, node.type);
-            case 286:
+            case 286 /* JSDocComment */:
                 return visitNodes(cbNode, cbNodes, node.tags);
-            case 293:
-            case 298:
+            case 293 /* JSDocParameterTag */:
+            case 298 /* JSDocPropertyTag */:
                 if (node.isNameFirst) {
                     return visitNode(cbNode, node.name) ||
                         visitNode(cbNode, node.typeExpression);
@@ -12240,17 +15401,17 @@ var ts;
                     return visitNode(cbNode, node.typeExpression) ||
                         visitNode(cbNode, node.name);
                 }
-            case 294:
+            case 294 /* JSDocReturnTag */:
                 return visitNode(cbNode, node.typeExpression);
-            case 295:
+            case 295 /* JSDocTypeTag */:
                 return visitNode(cbNode, node.typeExpression);
-            case 290:
+            case 290 /* JSDocAugmentsTag */:
                 return visitNode(cbNode, node.class);
-            case 296:
+            case 296 /* JSDocTemplateTag */:
                 return visitNodes(cbNode, cbNodes, node.typeParameters);
-            case 297:
+            case 297 /* JSDocTypedefTag */:
                 if (node.typeExpression &&
-                    node.typeExpression.kind === 278) {
+                    node.typeExpression.kind === 278 /* JSDocTypeExpression */) {
                     return visitNode(cbNode, node.typeExpression) ||
                         visitNode(cbNode, node.fullName);
                 }
@@ -12258,16 +15419,16 @@ var ts;
                     return visitNode(cbNode, node.fullName) ||
                         visitNode(cbNode, node.typeExpression);
                 }
-            case 292:
+            case 292 /* JSDocCallbackTag */:
                 return visitNode(cbNode, node.fullName) ||
                     visitNode(cbNode, node.typeExpression);
-            case 288:
+            case 288 /* JSDocSignature */:
                 return visitNodes(cbNode, cbNodes, node.decorators) ||
                     visitNodes(cbNode, cbNodes, node.modifiers) ||
                     visitNodes(cbNode, cbNodes, node.typeParameters) ||
                     visitNodes(cbNode, cbNodes, node.parameters) ||
                     visitNode(cbNode, node.type);
-            case 287:
+            case 287 /* JSDocTypeLiteral */:
                 if (node.jsDocPropertyTags) {
                     for (var _i = 0, _a = node.jsDocPropertyTags; _i < _a.length; _i++) {
                         var tag = _a[_i];
@@ -12275,7 +15436,7 @@ var ts;
                     }
                 }
                 return;
-            case 301:
+            case 301 /* PartiallyEmittedExpression */:
                 return visitNode(cbNode, node.expression);
         }
     }
@@ -12284,11 +15445,11 @@ var ts;
         if (setParentNodes === void 0) { setParentNodes = false; }
         ts.performance.mark("beforeParse");
         var result;
-        if (languageVersion === 100) {
-            result = Parser.parseJsonText(fileName, sourceText, languageVersion, undefined, setParentNodes);
+        if (languageVersion === 100 /* JSON */) {
+            result = Parser.parseJsonText(fileName, sourceText, languageVersion, /*syntaxCursor*/ undefined, setParentNodes);
         }
         else {
-            result = Parser.parseSourceFile(fileName, sourceText, languageVersion, undefined, setParentNodes, scriptKind);
+            result = Parser.parseSourceFile(fileName, sourceText, languageVersion, /*syntaxCursor*/ undefined, setParentNodes, scriptKind);
         }
         ts.performance.mark("afterParse");
         ts.performance.measure("Parse", "beforeParse", "afterParse");
@@ -12299,41 +15460,71 @@ var ts;
         return Parser.parseIsolatedEntityName(text, languageVersion);
     }
     ts.parseIsolatedEntityName = parseIsolatedEntityName;
+    /**
+     * Parse json text into SyntaxTree and return node and parse errors if any
+     * @param fileName
+     * @param sourceText
+     */
     function parseJsonText(fileName, sourceText) {
         return Parser.parseJsonText(fileName, sourceText);
     }
     ts.parseJsonText = parseJsonText;
+    // See also `isExternalOrCommonJsModule` in utilities.ts
     function isExternalModule(file) {
         return file.externalModuleIndicator !== undefined;
     }
     ts.isExternalModule = isExternalModule;
+    // Produces a new SourceFile for the 'newText' provided. The 'textChangeRange' parameter
+    // indicates what changed between the 'text' that this SourceFile has and the 'newText'.
+    // The SourceFile will be created with the compiler attempting to reuse as many nodes from
+    // this file as possible.
+    //
+    // Note: this function mutates nodes from this SourceFile. That means any existing nodes
+    // from this SourceFile that are being held onto may change as a result (including
+    // becoming detached from any SourceFile).  It is recommended that this SourceFile not
+    // be used once 'update' is called on it.
     function updateSourceFile(sourceFile, newText, textChangeRange, aggressiveChecks) {
         if (aggressiveChecks === void 0) { aggressiveChecks = false; }
         var newSourceFile = IncrementalParser.updateSourceFile(sourceFile, newText, textChangeRange, aggressiveChecks);
-        newSourceFile.flags |= (sourceFile.flags & 1572864);
+        // Because new source file node is created, it may not have the flag PossiblyContainDynamicImport. This is the case if there is no new edit to add dynamic import.
+        // We will manually port the flag to the new source file.
+        newSourceFile.flags |= (sourceFile.flags & 1572864 /* PermanentlySetIncrementalFlags */);
         return newSourceFile;
     }
     ts.updateSourceFile = updateSourceFile;
+    /* @internal */
     function parseIsolatedJSDocComment(content, start, length) {
         var result = Parser.JSDocParser.parseIsolatedJSDocComment(content, start, length);
         if (result && result.jsDoc) {
+            // because the jsDocComment was parsed out of the source file, it might
+            // not be covered by the fixupParentReferences.
             Parser.fixupParentReferences(result.jsDoc);
         }
         return result;
     }
     ts.parseIsolatedJSDocComment = parseIsolatedJSDocComment;
+    /* @internal */
+    // Exposed only for testing.
     function parseJSDocTypeExpressionForTests(content, start, length) {
         return Parser.JSDocParser.parseJSDocTypeExpressionForTests(content, start, length);
     }
     ts.parseJSDocTypeExpressionForTests = parseJSDocTypeExpressionForTests;
+    // Implement the parser as a singleton module.  We do this for perf reasons because creating
+    // parser instances can actually be expensive enough to impact us on projects with many source
+    // files.
     var Parser;
     (function (Parser) {
-        var scanner = ts.createScanner(6, true);
-        var disallowInAndDecoratorContext = 2048 | 8192;
+        // Share a single scanner across all calls to parse a source file.  This helps speed things
+        // up by avoiding the cost of creating/compiling scanners over and over again.
+        var scanner = ts.createScanner(6 /* Latest */, /*skipTrivia*/ true);
+        var disallowInAndDecoratorContext = 2048 /* DisallowInContext */ | 8192 /* DecoratorContext */;
+        // capture constructors in 'initializeState' to avoid null checks
+        // tslint:disable variable-name
         var NodeConstructor;
         var TokenConstructor;
         var IdentifierConstructor;
         var SourceFileConstructor;
+        // tslint:enable variable-name
         var sourceFile;
         var parseDiagnostics;
         var syntaxCursor;
@@ -12343,14 +15534,87 @@ var ts;
         var identifiers;
         var identifierCount;
         var parsingContext;
+        // Flags that dictate what parsing context we're in.  For example:
+        // Whether or not we are in strict parsing mode.  All that changes in strict parsing mode is
+        // that some tokens that would be considered identifiers may be considered keywords.
+        //
+        // When adding more parser context flags, consider which is the more common case that the
+        // flag will be in.  This should be the 'false' state for that flag.  The reason for this is
+        // that we don't store data in our nodes unless the value is in the *non-default* state.  So,
+        // for example, more often than code 'allows-in' (or doesn't 'disallow-in').  We opt for
+        // 'disallow-in' set to 'false'.  Otherwise, if we had 'allowsIn' set to 'true', then almost
+        // all nodes would need extra state on them to store this info.
+        //
+        // Note: 'allowIn' and 'allowYield' track 1:1 with the [in] and [yield] concepts in the ES6
+        // grammar specification.
+        //
+        // An important thing about these context concepts.  By default they are effectively inherited
+        // while parsing through every grammar production.  i.e. if you don't change them, then when
+        // you parse a sub-production, it will have the same context values as the parent production.
+        // This is great most of the time.  After all, consider all the 'expression' grammar productions
+        // and how nearly all of them pass along the 'in' and 'yield' context values:
+        //
+        // EqualityExpression[In, Yield] :
+        //      RelationalExpression[?In, ?Yield]
+        //      EqualityExpression[?In, ?Yield] == RelationalExpression[?In, ?Yield]
+        //      EqualityExpression[?In, ?Yield] != RelationalExpression[?In, ?Yield]
+        //      EqualityExpression[?In, ?Yield] === RelationalExpression[?In, ?Yield]
+        //      EqualityExpression[?In, ?Yield] !== RelationalExpression[?In, ?Yield]
+        //
+        // Where you have to be careful is then understanding what the points are in the grammar
+        // where the values are *not* passed along.  For example:
+        //
+        // SingleNameBinding[Yield,GeneratorParameter]
+        //      [+GeneratorParameter]BindingIdentifier[Yield] Initializer[In]opt
+        //      [~GeneratorParameter]BindingIdentifier[?Yield]Initializer[In, ?Yield]opt
+        //
+        // Here this is saying that if the GeneratorParameter context flag is set, that we should
+        // explicitly set the 'yield' context flag to false before calling into the BindingIdentifier
+        // and we should explicitly unset the 'yield' context flag before calling into the Initializer.
+        // production.  Conversely, if the GeneratorParameter context flag is not set, then we
+        // should leave the 'yield' context flag alone.
+        //
+        // Getting this all correct is tricky and requires careful reading of the grammar to
+        // understand when these values should be changed versus when they should be inherited.
+        //
+        // Note: it should not be necessary to save/restore these flags during speculative/lookahead
+        // parsing.  These context flags are naturally stored and restored through normal recursive
+        // descent parsing and unwinding.
         var contextFlags;
+        // Whether or not we've had a parse error since creating the last AST node.  If we have
+        // encountered an error, it will be stored on the next AST node we create.  Parse errors
+        // can be broken down into three categories:
+        //
+        // 1) An error that occurred during scanning.  For example, an unterminated literal, or a
+        //    character that was completely not understood.
+        //
+        // 2) A token was expected, but was not present.  This type of error is commonly produced
+        //    by the 'parseExpected' function.
+        //
+        // 3) A token was present that no parsing function was able to consume.  This type of error
+        //    only occurs in the 'abortParsingListOrMoveToNextToken' function when the parser
+        //    decides to skip the token.
+        //
+        // In all of these cases, we want to mark the next node as having had an error before it.
+        // With this mark, we can know in incremental settings if this node can be reused, or if
+        // we have to reparse it.  If we don't keep this information around, we may just reuse the
+        // node.  in that event we would then not produce the same errors as we did before, causing
+        // significant confusion problems.
+        //
+        // Note: it is necessary that this value be saved/restored during speculative/lookahead
+        // parsing.  During lookahead parsing, we will often create a node.  That node will have
+        // this value attached, and then this value will be set back to 'false'.  If we decide to
+        // rewind, we must get back to the same value we had prior to the lookahead.
+        //
+        // Note: any errors at the end of the file that do not precede a regular node, should get
+        // attached to the EOF token.
         var parseErrorBeforeNextFinishedNode = false;
         function parseSourceFile(fileName, sourceText, languageVersion, syntaxCursor, setParentNodes, scriptKind) {
             if (setParentNodes === void 0) { setParentNodes = false; }
             scriptKind = ts.ensureScriptKind(fileName, scriptKind);
-            if (scriptKind === 6) {
+            if (scriptKind === 6 /* JSON */) {
                 var result_1 = parseJsonText(fileName, sourceText, languageVersion, syntaxCursor, setParentNodes);
-                ts.convertToObjectWorker(result_1, result_1.parseDiagnostics, false, undefined, undefined);
+                ts.convertToObjectWorker(result_1, result_1.parseDiagnostics, /*returnValue*/ false, /*knownRootOptions*/ undefined, /*jsonConversionNotifier*/ undefined);
                 result_1.typeReferenceDirectives = ts.emptyArray;
                 result_1.amdDependencies = ts.emptyArray;
                 return result_1;
@@ -12362,57 +15626,62 @@ var ts;
         }
         Parser.parseSourceFile = parseSourceFile;
         function parseIsolatedEntityName(content, languageVersion) {
-            initializeState(content, languageVersion, undefined, 1);
+            // Choice of `isDeclarationFile` should be arbitrary
+            initializeState(content, languageVersion, /*syntaxCursor*/ undefined, 1 /* JS */);
+            // Prime the scanner.
             nextToken();
-            var entityName = parseEntityName(true);
-            var isInvalid = token() === 1 && !parseDiagnostics.length;
+            var entityName = parseEntityName(/*allowReservedWords*/ true);
+            var isInvalid = token() === 1 /* EndOfFileToken */ && !parseDiagnostics.length;
             clearState();
             return isInvalid ? entityName : undefined;
         }
         Parser.parseIsolatedEntityName = parseIsolatedEntityName;
         function parseJsonText(fileName, sourceText, languageVersion, syntaxCursor, setParentNodes) {
-            if (languageVersion === void 0) { languageVersion = 2; }
-            initializeState(sourceText, languageVersion, syntaxCursor, 6);
-            sourceFile = createSourceFile(fileName, 2, 6, false);
+            if (languageVersion === void 0) { languageVersion = 2 /* ES2015 */; }
+            initializeState(sourceText, languageVersion, syntaxCursor, 6 /* JSON */);
+            // Set source file so that errors will be reported with this file name
+            sourceFile = createSourceFile(fileName, 2 /* ES2015 */, 6 /* JSON */, /*isDeclaration*/ false);
             sourceFile.flags = contextFlags;
+            // Prime the scanner.
             nextToken();
             var pos = getNodePos();
-            if (token() === 1) {
+            if (token() === 1 /* EndOfFileToken */) {
                 sourceFile.statements = createNodeArray([], pos, pos);
                 sourceFile.endOfFileToken = parseTokenNode();
             }
             else {
-                var statement = createNode(216);
+                var statement = createNode(216 /* ExpressionStatement */);
                 switch (token()) {
-                    case 21:
+                    case 21 /* OpenBracketToken */:
                         statement.expression = parseArrayLiteralExpression();
                         break;
-                    case 101:
-                    case 86:
-                    case 95:
+                    case 101 /* TrueKeyword */:
+                    case 86 /* FalseKeyword */:
+                    case 95 /* NullKeyword */:
                         statement.expression = parseTokenNode();
                         break;
-                    case 38:
-                        if (lookAhead(function () { return nextToken() === 8 && nextToken() !== 56; })) {
+                    case 38 /* MinusToken */:
+                        if (lookAhead(function () { return nextToken() === 8 /* NumericLiteral */ && nextToken() !== 56 /* ColonToken */; })) {
                             statement.expression = parsePrefixUnaryExpression();
                         }
                         else {
                             statement.expression = parseObjectLiteralExpression();
                         }
                         break;
-                    case 8:
-                    case 9:
-                        if (lookAhead(function () { return nextToken() !== 56; })) {
+                    case 8 /* NumericLiteral */:
+                    case 9 /* StringLiteral */:
+                        if (lookAhead(function () { return nextToken() !== 56 /* ColonToken */; })) {
                             statement.expression = parseLiteralNode();
                             break;
                         }
+                    // falls through
                     default:
                         statement.expression = parseObjectLiteralExpression();
                         break;
                 }
                 finishNode(statement);
                 sourceFile.statements = createNodeArray([statement], pos);
-                sourceFile.endOfFileToken = parseExpectedToken(1, ts.Diagnostics.Unexpected_token);
+                sourceFile.endOfFileToken = parseExpectedToken(1 /* EndOfFileToken */, ts.Diagnostics.Unexpected_token);
             }
             if (setParentNodes) {
                 fixupParentReferences(sourceFile);
@@ -12424,7 +15693,8 @@ var ts;
         }
         Parser.parseJsonText = parseJsonText;
         function getLanguageVariant(scriptKind) {
-            return scriptKind === 4 || scriptKind === 2 || scriptKind === 1 || scriptKind === 6 ? 1 : 0;
+            // .tsx and .jsx files are treated as jsx language variant.
+            return scriptKind === 4 /* TSX */ || scriptKind === 2 /* JSX */ || scriptKind === 1 /* JS */ || scriptKind === 6 /* JSON */ ? 1 /* JSX */ : 0 /* Standard */;
         }
         function initializeState(_sourceText, languageVersion, _syntaxCursor, scriptKind) {
             NodeConstructor = ts.objectAllocator.getNodeConstructor();
@@ -12439,26 +15709,29 @@ var ts;
             identifierCount = 0;
             nodeCount = 0;
             switch (scriptKind) {
-                case 1:
-                case 2:
-                    contextFlags = 65536;
+                case 1 /* JS */:
+                case 2 /* JSX */:
+                    contextFlags = 65536 /* JavaScriptFile */;
                     break;
-                case 6:
-                    contextFlags = 65536 | 16777216;
+                case 6 /* JSON */:
+                    contextFlags = 65536 /* JavaScriptFile */ | 16777216 /* JsonFile */;
                     break;
                 default:
-                    contextFlags = 0;
+                    contextFlags = 0 /* None */;
                     break;
             }
             parseErrorBeforeNextFinishedNode = false;
+            // Initialize and prime the scanner before parsing the source elements.
             scanner.setText(sourceText);
             scanner.setOnError(scanError);
             scanner.setScriptTarget(languageVersion);
             scanner.setLanguageVariant(getLanguageVariant(scriptKind));
         }
         function clearState() {
+            // Clear out the text the scanner is pointing at, so it doesn't keep anything alive unnecessarily.
             scanner.setText("");
             scanner.setOnError(undefined);
+            // Clear any data.  We don't want to accidentally hold onto it for too long.
             parseDiagnostics = undefined;
             sourceFile = undefined;
             identifiers = undefined;
@@ -12468,15 +15741,17 @@ var ts;
         function parseSourceFileWorker(fileName, languageVersion, setParentNodes, scriptKind) {
             var isDeclarationFile = isDeclarationFileName(fileName);
             if (isDeclarationFile) {
-                contextFlags |= 4194304;
+                contextFlags |= 4194304 /* Ambient */;
             }
             sourceFile = createSourceFile(fileName, languageVersion, scriptKind, isDeclarationFile);
             sourceFile.flags = contextFlags;
+            // Prime the scanner.
             nextToken();
+            // A member of ReadonlyArray<T> isn't assignable to a member of T[] (and prevents a direct cast) - but this is where we set up those members so they can be readonly in the future
             processCommentPragmas(sourceFile, sourceText);
             processPragmasIntoFields(sourceFile, reportPragmaDiagnostic);
-            sourceFile.statements = parseList(0, parseStatement);
-            ts.Debug.assert(token() === 1);
+            sourceFile.statements = parseList(0 /* SourceElements */, parseStatement);
+            ts.Debug.assert(token() === 1 /* EndOfFileToken */);
             sourceFile.endOfFileToken = addJSDocComment(parseTokenNode());
             setExternalModuleIndicator(sourceFile);
             sourceFile.nodeCount = nodeCount;
@@ -12502,10 +15777,17 @@ var ts;
             return node;
         }
         function fixupParentReferences(rootNode) {
+            // normally parent references are set during binding. However, for clients that only need
+            // a syntax tree, and no semantic features, then the binding process is an unnecessary
+            // overhead.  This functions allows us to set all the parents, without all the expense of
+            // binding.
             var parent = rootNode;
             forEachChild(rootNode, visitNode);
             return;
             function visitNode(n) {
+                // walk down setting parents that differ from the parent we think it should be.  This
+                // allows us to quickly bail out of setting parents for subtrees during incremental
+                // parsing
                 if (n.parent !== parent) {
                     n.parent = parent;
                     var saveParent = parent;
@@ -12525,7 +15807,9 @@ var ts;
         }
         Parser.fixupParentReferences = fixupParentReferences;
         function createSourceFile(fileName, languageVersion, scriptKind, isDeclarationFile) {
-            var sourceFile = new SourceFileConstructor(274, 0, sourceText.length);
+            // code from createNode is inlined here so createNode won't have to deal with special case of creating source files
+            // this is quite rare comparing to other nodes and createNode should be as fast as possible
+            var sourceFile = new SourceFileConstructor(274 /* SourceFile */, /*pos*/ 0, /* end */ sourceText.length);
             nodeCount++;
             sourceFile.text = sourceText;
             sourceFile.bindDiagnostics = [];
@@ -12546,81 +15830,102 @@ var ts;
             }
         }
         function setDisallowInContext(val) {
-            setContextFlag(val, 2048);
+            setContextFlag(val, 2048 /* DisallowInContext */);
         }
         function setYieldContext(val) {
-            setContextFlag(val, 4096);
+            setContextFlag(val, 4096 /* YieldContext */);
         }
         function setDecoratorContext(val) {
-            setContextFlag(val, 8192);
+            setContextFlag(val, 8192 /* DecoratorContext */);
         }
         function setAwaitContext(val) {
-            setContextFlag(val, 16384);
+            setContextFlag(val, 16384 /* AwaitContext */);
         }
         function doOutsideOfContext(context, func) {
+            // contextFlagsToClear will contain only the context flags that are
+            // currently set that we need to temporarily clear
+            // We don't just blindly reset to the previous flags to ensure
+            // that we do not mutate cached flags for the incremental
+            // parser (ThisNodeHasError, ThisNodeOrAnySubNodesHasError, and
+            // HasAggregatedChildData).
             var contextFlagsToClear = context & contextFlags;
             if (contextFlagsToClear) {
-                setContextFlag(false, contextFlagsToClear);
+                // clear the requested context flags
+                setContextFlag(/*val*/ false, contextFlagsToClear);
                 var result = func();
-                setContextFlag(true, contextFlagsToClear);
+                // restore the context flags we just cleared
+                setContextFlag(/*val*/ true, contextFlagsToClear);
                 return result;
             }
+            // no need to do anything special as we are not in any of the requested contexts
             return func();
         }
         function doInsideOfContext(context, func) {
+            // contextFlagsToSet will contain only the context flags that
+            // are not currently set that we need to temporarily enable.
+            // We don't just blindly reset to the previous flags to ensure
+            // that we do not mutate cached flags for the incremental
+            // parser (ThisNodeHasError, ThisNodeOrAnySubNodesHasError, and
+            // HasAggregatedChildData).
             var contextFlagsToSet = context & ~contextFlags;
             if (contextFlagsToSet) {
-                setContextFlag(true, contextFlagsToSet);
+                // set the requested context flags
+                setContextFlag(/*val*/ true, contextFlagsToSet);
                 var result = func();
-                setContextFlag(false, contextFlagsToSet);
+                // reset the context flags we just set
+                setContextFlag(/*val*/ false, contextFlagsToSet);
                 return result;
             }
+            // no need to do anything special as we are already in all of the requested contexts
             return func();
         }
         function allowInAnd(func) {
-            return doOutsideOfContext(2048, func);
+            return doOutsideOfContext(2048 /* DisallowInContext */, func);
         }
         function disallowInAnd(func) {
-            return doInsideOfContext(2048, func);
+            return doInsideOfContext(2048 /* DisallowInContext */, func);
         }
         function doInYieldContext(func) {
-            return doInsideOfContext(4096, func);
+            return doInsideOfContext(4096 /* YieldContext */, func);
         }
         function doInDecoratorContext(func) {
-            return doInsideOfContext(8192, func);
+            return doInsideOfContext(8192 /* DecoratorContext */, func);
         }
         function doInAwaitContext(func) {
-            return doInsideOfContext(16384, func);
+            return doInsideOfContext(16384 /* AwaitContext */, func);
         }
         function doOutsideOfAwaitContext(func) {
-            return doOutsideOfContext(16384, func);
+            return doOutsideOfContext(16384 /* AwaitContext */, func);
         }
         function doInYieldAndAwaitContext(func) {
-            return doInsideOfContext(4096 | 16384, func);
+            return doInsideOfContext(4096 /* YieldContext */ | 16384 /* AwaitContext */, func);
         }
         function inContext(flags) {
             return (contextFlags & flags) !== 0;
         }
         function inYieldContext() {
-            return inContext(4096);
+            return inContext(4096 /* YieldContext */);
         }
         function inDisallowInContext() {
-            return inContext(2048);
+            return inContext(2048 /* DisallowInContext */);
         }
         function inDecoratorContext() {
-            return inContext(8192);
+            return inContext(8192 /* DecoratorContext */);
         }
         function inAwaitContext() {
-            return inContext(16384);
+            return inContext(16384 /* AwaitContext */);
         }
         function parseErrorAtCurrentToken(message, arg0) {
             parseErrorAt(scanner.getTokenPos(), scanner.getTextPos(), message, arg0);
         }
         function parseErrorAtPosition(start, length, message, arg0) {
+            // Don't report another error if it would just be at the same position as the last error.
             var lastError = ts.lastOrUndefined(parseDiagnostics);
             if (!lastError || start !== lastError.start) {
                 parseDiagnostics.push(ts.createFileDiagnostic(sourceFile, start, length, message, arg0));
             }
+            // Mark that we've encountered an error.  We'll set an appropriate bit on the next
+            // node we finish so that it can't be reused incrementally.
             parseErrorBeforeNextFinishedNode = true;
         }
         function parseErrorAt(start, end, message, arg0) {
@@ -12635,6 +15940,12 @@ var ts;
         function getNodePos() {
             return scanner.getStartPos();
         }
+        // Use this function to access the current token instead of reading the currentToken
+        // variable. Since function results aren't narrowed in control flow analysis, this ensures
+        // that the type checker doesn't make wrong assumptions about the type of the current
+        // token (e.g. a call to nextToken() changes the current token but the checker doesn't
+        // reason about this side effect).  Mainstream VMs inline simple functions like this, so
+        // there is no performance penalty.
         function token() {
             return currentToken;
         }
@@ -12660,14 +15971,25 @@ var ts;
             return currentToken = scanner.scanJsxAttributeValue();
         }
         function speculationHelper(callback, isLookAhead) {
+            // Keep track of the state we'll need to rollback to if lookahead fails (or if the
+            // caller asked us to always reset our state).
             var saveToken = currentToken;
             var saveParseDiagnosticsLength = parseDiagnostics.length;
             var saveParseErrorBeforeNextFinishedNode = parseErrorBeforeNextFinishedNode;
+            // Note: it is not actually necessary to save/restore the context flags here.  That's
+            // because the saving/restoring of these flags happens naturally through the recursive
+            // descent nature of our parser.  However, we still store this here just so we can
+            // assert that invariant holds.
             var saveContextFlags = contextFlags;
+            // If we're only looking ahead, then tell the scanner to only lookahead as well.
+            // Otherwise, if we're actually speculatively parsing, then tell the scanner to do the
+            // same.
             var result = isLookAhead
                 ? scanner.lookAhead(callback)
                 : scanner.tryScan(callback);
             ts.Debug.assert(saveContextFlags === contextFlags);
+            // If our callback returned something 'falsy' or we're just looking ahead,
+            // then unconditionally restore us to where we were.
             if (!result || isLookAhead) {
                 currentToken = saveToken;
                 parseDiagnostics.length = saveParseDiagnosticsLength;
@@ -12675,23 +15997,37 @@ var ts;
             }
             return result;
         }
+        /** Invokes the provided callback then unconditionally restores the parser to the state it
+         * was in immediately prior to invoking the callback.  The result of invoking the callback
+         * is returned from this function.
+         */
         function lookAhead(callback) {
-            return speculationHelper(callback, true);
+            return speculationHelper(callback, /*isLookAhead*/ true);
         }
+        /** Invokes the provided callback.  If the callback returns something falsy, then it restores
+         * the parser to the state it was in immediately prior to invoking the callback.  If the
+         * callback returns something truthy, then the parser state is not rolled back.  The result
+         * of invoking the callback is returned from this function.
+         */
         function tryParse(callback) {
-            return speculationHelper(callback, false);
+            return speculationHelper(callback, /*isLookAhead*/ false);
         }
+        // Ignore strict mode flag because we will report an error in type checker instead.
         function isIdentifier() {
-            if (token() === 71) {
+            if (token() === 71 /* Identifier */) {
                 return true;
             }
-            if (token() === 116 && inYieldContext()) {
+            // If we have a 'yield' keyword, and we're in the [yield] context, then 'yield' is
+            // considered a keyword and is not an identifier.
+            if (token() === 116 /* YieldKeyword */ && inYieldContext()) {
                 return false;
             }
-            if (token() === 121 && inAwaitContext()) {
+            // If we have a 'await' keyword, and we're in the [Await] context, then 'await' is
+            // considered a keyword and is not an identifier.
+            if (token() === 121 /* AwaitKeyword */ && inAwaitContext()) {
                 return false;
             }
-            return token() > 107;
+            return token() > 107 /* LastReservedWord */;
         }
         function parseExpected(kind, diagnosticMessage, shouldAdvance) {
             if (shouldAdvance === void 0) { shouldAdvance = true; }
@@ -12701,6 +16037,7 @@ var ts;
                 }
                 return true;
             }
+            // Report specific message if provided with one.  Otherwise, report generic fallback message.
             if (diagnosticMessage) {
                 parseErrorAtCurrentToken(diagnosticMessage);
             }
@@ -12724,7 +16061,7 @@ var ts;
         }
         function parseExpectedToken(t, diagnosticMessage, arg0) {
             return parseOptionalToken(t) ||
-                createMissingNode(t, false, diagnosticMessage || ts.Diagnostics._0_expected, arg0 || ts.tokenToString(t));
+                createMissingNode(t, /*reportAtCurrentPosition*/ false, diagnosticMessage || ts.Diagnostics._0_expected, arg0 || ts.tokenToString(t));
         }
         function parseTokenNode() {
             var node = createNode(token());
@@ -12732,37 +16069,43 @@ var ts;
             return finishNode(node);
         }
         function canParseSemicolon() {
-            if (token() === 25) {
+            // If there's a real semicolon, then we can always parse it out.
+            if (token() === 25 /* SemicolonToken */) {
                 return true;
             }
-            return token() === 18 || token() === 1 || scanner.hasPrecedingLineBreak();
+            // We can parse out an optional semicolon in ASI cases in the following cases.
+            return token() === 18 /* CloseBraceToken */ || token() === 1 /* EndOfFileToken */ || scanner.hasPrecedingLineBreak();
         }
         function parseSemicolon() {
             if (canParseSemicolon()) {
-                if (token() === 25) {
+                if (token() === 25 /* SemicolonToken */) {
+                    // consume the semicolon if it was explicitly provided.
                     nextToken();
                 }
                 return true;
             }
             else {
-                return parseExpected(25);
+                return parseExpected(25 /* SemicolonToken */);
             }
         }
         function createNode(kind, pos) {
             nodeCount++;
             var p = pos >= 0 ? pos : scanner.getStartPos();
-            return ts.isNodeKind(kind) || kind === 0 ? new NodeConstructor(kind, p, p) :
-                kind === 71 ? new IdentifierConstructor(kind, p, p) :
+            return ts.isNodeKind(kind) || kind === 0 /* Unknown */ ? new NodeConstructor(kind, p, p) :
+                kind === 71 /* Identifier */ ? new IdentifierConstructor(kind, p, p) :
                     new TokenConstructor(kind, p, p);
         }
-        function createNodeWithJSDoc(kind) {
-            var node = createNode(kind);
-            if (scanner.getTokenFlags() & 2) {
+        function createNodeWithJSDoc(kind, pos) {
+            var node = createNode(kind, pos);
+            if (scanner.getTokenFlags() & 2 /* PrecedingJSDocComment */) {
                 addJSDocComment(node);
             }
             return node;
         }
         function createNodeArray(elements, pos, end) {
+            // Since the element list of a node array is typically created by starting with an empty array and
+            // repeatedly calling push(), the list may not have the optimal memory layout. We invoke slice() for
+            // small arrays (1 to 4 elements) to give the VM a chance to allocate an optimal representation.
             var length = elements.length;
             var array = (length >= 1 && length <= 4 ? elements.slice() : elements);
             array.pos = pos;
@@ -12774,9 +16117,12 @@ var ts;
             if (contextFlags) {
                 node.flags |= contextFlags;
             }
+            // Keep track on the node if we encountered an error while parsing it.  If we did, then
+            // we cannot reuse the node incrementally.  Once we've marked this node, clear out the
+            // flag so that we don't mark any subsequent nodes.
             if (parseErrorBeforeNextFinishedNode) {
                 parseErrorBeforeNextFinishedNode = false;
-                node.flags |= 32768;
+                node.flags |= 32768 /* ThisNodeHasError */;
             }
             return node;
         }
@@ -12788,7 +16134,7 @@ var ts;
                 parseErrorAtCurrentToken(diagnosticMessage, arg0);
             }
             var result = createNode(kind);
-            if (kind === 71) {
+            if (kind === 71 /* Identifier */) {
                 result.escapedText = "";
             }
             else if (ts.isLiteralKind(kind) || ts.isTemplateLiteralKind(kind)) {
@@ -12803,19 +16149,24 @@ var ts;
             }
             return identifier;
         }
+        // An identifier that starts with two underscores has an extra underscore character prepended to it to avoid issues
+        // with magic property names like '__proto__'. The 'identifiers' object is used to share a single string instance for
+        // each identifier in order to reduce memory consumption.
         function createIdentifier(isIdentifier, diagnosticMessage) {
             identifierCount++;
             if (isIdentifier) {
-                var node = createNode(71);
-                if (token() !== 71) {
+                var node = createNode(71 /* Identifier */);
+                // Store original token kind if it is not just an Identifier so we can report appropriate error later in type checker
+                if (token() !== 71 /* Identifier */) {
                     node.originalKeywordKind = token();
                 }
                 node.escapedText = ts.escapeLeadingUnderscores(internIdentifier(scanner.getTokenValue()));
                 nextToken();
                 return finishNode(node);
             }
-            var reportAtCurrentPosition = token() === 1;
-            return createMissingNode(71, reportAtCurrentPosition, diagnosticMessage || ts.Diagnostics.Identifier_expected);
+            // Only for end of file because the error gets reported incorrectly on embedded script tags.
+            var reportAtCurrentPosition = token() === 1 /* EndOfFileToken */;
+            return createMissingNode(71 /* Identifier */, reportAtCurrentPosition, diagnosticMessage || ts.Diagnostics.Identifier_expected);
         }
         function parseIdentifier(diagnosticMessage) {
             return createIdentifier(isIdentifier(), diagnosticMessage);
@@ -12825,28 +16176,34 @@ var ts;
         }
         function isLiteralPropertyName() {
             return ts.tokenIsIdentifierOrKeyword(token()) ||
-                token() === 9 ||
-                token() === 8;
+                token() === 9 /* StringLiteral */ ||
+                token() === 8 /* NumericLiteral */;
         }
         function parsePropertyNameWorker(allowComputedPropertyNames) {
-            if (token() === 9 || token() === 8) {
+            if (token() === 9 /* StringLiteral */ || token() === 8 /* NumericLiteral */) {
                 var node = parseLiteralNode();
                 node.text = internIdentifier(node.text);
                 return node;
             }
-            if (allowComputedPropertyNames && token() === 21) {
+            if (allowComputedPropertyNames && token() === 21 /* OpenBracketToken */) {
                 return parseComputedPropertyName();
             }
             return parseIdentifierName();
         }
         function parsePropertyName() {
-            return parsePropertyNameWorker(true);
+            return parsePropertyNameWorker(/*allowComputedPropertyNames*/ true);
         }
         function parseComputedPropertyName() {
-            var node = createNode(147);
-            parseExpected(21);
+            // PropertyName [Yield]:
+            //      LiteralPropertyName
+            //      ComputedPropertyName[?Yield]
+            var node = createNode(147 /* ComputedPropertyName */);
+            parseExpected(21 /* OpenBracketToken */);
+            // We parse any expression (including a comma expression). But the grammar
+            // says that only an assignment expression is allowed, so the grammar checker
+            // will error if it sees a comma expression.
             node.expression = allowInAnd(parseExpression);
-            parseExpected(22);
+            parseExpected(22 /* CloseBracketToken */);
             return finishNode(node);
         }
         function parseContextualModifier(t) {
@@ -12861,19 +16218,20 @@ var ts;
         }
         function nextTokenCanFollowModifier() {
             switch (token()) {
-                case 76:
-                    return nextToken() === 83;
-                case 84:
+                case 76 /* ConstKeyword */:
+                    // 'const' is only a modifier if followed by 'enum'.
+                    return nextToken() === 83 /* EnumKeyword */;
+                case 84 /* ExportKeyword */:
                     nextToken();
-                    if (token() === 79) {
+                    if (token() === 79 /* DefaultKeyword */) {
                         return lookAhead(nextTokenCanFollowDefaultKeyword);
                     }
-                    return token() !== 39 && token() !== 118 && token() !== 17 && canFollowModifier();
-                case 79:
+                    return token() !== 39 /* AsteriskToken */ && token() !== 118 /* AsKeyword */ && token() !== 17 /* OpenBraceToken */ && canFollowModifier();
+                case 79 /* DefaultKeyword */:
                     return nextTokenCanFollowDefaultKeyword();
-                case 115:
-                case 125:
-                case 136:
+                case 115 /* StaticKeyword */:
+                case 125 /* GetKeyword */:
+                case 136 /* SetKeyword */:
                     nextToken();
                     return canFollowModifier();
                 default:
@@ -12884,86 +16242,112 @@ var ts;
             return ts.isModifierKind(token()) && tryParse(nextTokenCanFollowModifier);
         }
         function canFollowModifier() {
-            return token() === 21
-                || token() === 17
-                || token() === 39
-                || token() === 24
+            return token() === 21 /* OpenBracketToken */
+                || token() === 17 /* OpenBraceToken */
+                || token() === 39 /* AsteriskToken */
+                || token() === 24 /* DotDotDotToken */
                 || isLiteralPropertyName();
         }
         function nextTokenCanFollowDefaultKeyword() {
             nextToken();
-            return token() === 75 || token() === 89 ||
-                token() === 109 ||
-                (token() === 117 && lookAhead(nextTokenIsClassKeywordOnSameLine)) ||
-                (token() === 120 && lookAhead(nextTokenIsFunctionKeywordOnSameLine));
+            return token() === 75 /* ClassKeyword */ || token() === 89 /* FunctionKeyword */ ||
+                token() === 109 /* InterfaceKeyword */ ||
+                (token() === 117 /* AbstractKeyword */ && lookAhead(nextTokenIsClassKeywordOnSameLine)) ||
+                (token() === 120 /* AsyncKeyword */ && lookAhead(nextTokenIsFunctionKeywordOnSameLine));
         }
+        // True if positioned at the start of a list element
         function isListElement(parsingContext, inErrorRecovery) {
             var node = currentNode(parsingContext);
             if (node) {
                 return true;
             }
             switch (parsingContext) {
-                case 0:
-                case 1:
-                case 3:
-                    return !(token() === 25 && inErrorRecovery) && isStartOfStatement();
-                case 2:
-                    return token() === 73 || token() === 79;
-                case 4:
+                case 0 /* SourceElements */:
+                case 1 /* BlockStatements */:
+                case 3 /* SwitchClauseStatements */:
+                    // If we're in error recovery, then we don't want to treat ';' as an empty statement.
+                    // The problem is that ';' can show up in far too many contexts, and if we see one
+                    // and assume it's a statement, then we may bail out inappropriately from whatever
+                    // we're parsing.  For example, if we have a semicolon in the middle of a class, then
+                    // we really don't want to assume the class is over and we're on a statement in the
+                    // outer module.  We just want to consume and move on.
+                    return !(token() === 25 /* SemicolonToken */ && inErrorRecovery) && isStartOfStatement();
+                case 2 /* SwitchClauses */:
+                    return token() === 73 /* CaseKeyword */ || token() === 79 /* DefaultKeyword */;
+                case 4 /* TypeMembers */:
                     return lookAhead(isTypeMemberStart);
-                case 5:
-                    return lookAhead(isClassMemberStart) || (token() === 25 && !inErrorRecovery);
-                case 6:
-                    return token() === 21 || isLiteralPropertyName();
-                case 12:
-                    return token() === 21 || token() === 39 || token() === 24 || isLiteralPropertyName();
-                case 17:
+                case 5 /* ClassMembers */:
+                    // We allow semicolons as class elements (as specified by ES6) as long as we're
+                    // not in error recovery.  If we're in error recovery, we don't want an errant
+                    // semicolon to be treated as a class member (since they're almost always used
+                    // for statements.
+                    return lookAhead(isClassMemberStart) || (token() === 25 /* SemicolonToken */ && !inErrorRecovery);
+                case 6 /* EnumMembers */:
+                    // Include open bracket computed properties. This technically also lets in indexers,
+                    // which would be a candidate for improved error reporting.
+                    return token() === 21 /* OpenBracketToken */ || isLiteralPropertyName();
+                case 12 /* ObjectLiteralMembers */:
+                    return token() === 21 /* OpenBracketToken */ || token() === 39 /* AsteriskToken */ || token() === 24 /* DotDotDotToken */ || isLiteralPropertyName();
+                case 17 /* RestProperties */:
                     return isLiteralPropertyName();
-                case 9:
-                    return token() === 21 || token() === 24 || isLiteralPropertyName();
-                case 7:
-                    if (token() === 17) {
+                case 9 /* ObjectBindingElements */:
+                    return token() === 21 /* OpenBracketToken */ || token() === 24 /* DotDotDotToken */ || isLiteralPropertyName();
+                case 7 /* HeritageClauseElement */:
+                    // If we see `{ ... }` then only consume it as an expression if it is followed by `,` or `{`
+                    // That way we won't consume the body of a class in its heritage clause.
+                    if (token() === 17 /* OpenBraceToken */) {
                         return lookAhead(isValidHeritageClauseObjectLiteral);
                     }
                     if (!inErrorRecovery) {
                         return isStartOfLeftHandSideExpression() && !isHeritageClauseExtendsOrImplementsKeyword();
                     }
                     else {
+                        // If we're in error recovery we tighten up what we're willing to match.
+                        // That way we don't treat something like "this" as a valid heritage clause
+                        // element during recovery.
                         return isIdentifier() && !isHeritageClauseExtendsOrImplementsKeyword();
                     }
-                case 8:
+                case 8 /* VariableDeclarations */:
                     return isIdentifierOrPattern();
-                case 10:
-                    return token() === 26 || token() === 24 || isIdentifierOrPattern();
-                case 18:
+                case 10 /* ArrayBindingElements */:
+                    return token() === 26 /* CommaToken */ || token() === 24 /* DotDotDotToken */ || isIdentifierOrPattern();
+                case 18 /* TypeParameters */:
                     return isIdentifier();
-                case 15:
-                    if (token() === 26) {
+                case 15 /* ArrayLiteralMembers */:
+                    if (token() === 26 /* CommaToken */) {
                         return true;
                     }
-                case 11:
-                    return token() === 24 || isStartOfExpression();
-                case 16:
+                // falls through
+                case 11 /* ArgumentExpressions */:
+                    return token() === 24 /* DotDotDotToken */ || isStartOfExpression();
+                case 16 /* Parameters */:
                     return isStartOfParameter();
-                case 19:
-                case 20:
-                    return token() === 26 || isStartOfType();
-                case 21:
+                case 19 /* TypeArguments */:
+                case 20 /* TupleElementTypes */:
+                    return token() === 26 /* CommaToken */ || isStartOfType();
+                case 21 /* HeritageClauses */:
                     return isHeritageClause();
-                case 22:
+                case 22 /* ImportOrExportSpecifiers */:
                     return ts.tokenIsIdentifierOrKeyword(token());
-                case 13:
-                    return ts.tokenIsIdentifierOrKeyword(token()) || token() === 17;
-                case 14:
+                case 13 /* JsxAttributes */:
+                    return ts.tokenIsIdentifierOrKeyword(token()) || token() === 17 /* OpenBraceToken */;
+                case 14 /* JsxChildren */:
                     return true;
             }
             return ts.Debug.fail("Non-exhaustive case in 'isListElement'.");
         }
         function isValidHeritageClauseObjectLiteral() {
-            ts.Debug.assert(token() === 17);
-            if (nextToken() === 18) {
+            ts.Debug.assert(token() === 17 /* OpenBraceToken */);
+            if (nextToken() === 18 /* CloseBraceToken */) {
+                // if we see "extends {}" then only treat the {} as what we're extending (and not
+                // the class body) if we have:
+                //
+                //      extends {} {
+                //      extends {},
+                //      extends {} extends
+                //      extends {} implements
                 var next = nextToken();
-                return next === 26 || next === 17 || next === 85 || next === 108;
+                return next === 26 /* CommaToken */ || next === 17 /* OpenBraceToken */ || next === 85 /* ExtendsKeyword */ || next === 108 /* ImplementsKeyword */;
             }
             return true;
         }
@@ -12980,8 +16364,8 @@ var ts;
             return ts.tokenIsIdentifierOrKeywordOrGreaterThan(token());
         }
         function isHeritageClauseExtendsOrImplementsKeyword() {
-            if (token() === 108 ||
-                token() === 85) {
+            if (token() === 108 /* ImplementsKeyword */ ||
+                token() === 85 /* ExtendsKeyword */) {
                 return lookAhead(nextTokenIsStartOfExpression);
             }
             return false;
@@ -12994,78 +16378,95 @@ var ts;
             nextToken();
             return isStartOfType();
         }
+        // True if positioned at a list terminator
         function isListTerminator(kind) {
-            if (token() === 1) {
+            if (token() === 1 /* EndOfFileToken */) {
+                // Being at the end of the file ends all lists.
                 return true;
             }
             switch (kind) {
-                case 1:
-                case 2:
-                case 4:
-                case 5:
-                case 6:
-                case 12:
-                case 9:
-                case 22:
-                    return token() === 18;
-                case 3:
-                    return token() === 18 || token() === 73 || token() === 79;
-                case 7:
-                    return token() === 17 || token() === 85 || token() === 108;
-                case 8:
+                case 1 /* BlockStatements */:
+                case 2 /* SwitchClauses */:
+                case 4 /* TypeMembers */:
+                case 5 /* ClassMembers */:
+                case 6 /* EnumMembers */:
+                case 12 /* ObjectLiteralMembers */:
+                case 9 /* ObjectBindingElements */:
+                case 22 /* ImportOrExportSpecifiers */:
+                    return token() === 18 /* CloseBraceToken */;
+                case 3 /* SwitchClauseStatements */:
+                    return token() === 18 /* CloseBraceToken */ || token() === 73 /* CaseKeyword */ || token() === 79 /* DefaultKeyword */;
+                case 7 /* HeritageClauseElement */:
+                    return token() === 17 /* OpenBraceToken */ || token() === 85 /* ExtendsKeyword */ || token() === 108 /* ImplementsKeyword */;
+                case 8 /* VariableDeclarations */:
                     return isVariableDeclaratorListTerminator();
-                case 18:
-                    return token() === 29 || token() === 19 || token() === 17 || token() === 85 || token() === 108;
-                case 11:
-                    return token() === 20 || token() === 25;
-                case 15:
-                case 20:
-                case 10:
-                    return token() === 22;
-                case 16:
-                case 17:
-                    return token() === 20 || token() === 22;
-                case 19:
-                    return token() !== 26;
-                case 21:
-                    return token() === 17 || token() === 18;
-                case 13:
-                    return token() === 29 || token() === 41;
-                case 14:
-                    return token() === 27 && lookAhead(nextTokenIsSlash);
+                case 18 /* TypeParameters */:
+                    // Tokens other than '>' are here for better error recovery
+                    return token() === 29 /* GreaterThanToken */ || token() === 19 /* OpenParenToken */ || token() === 17 /* OpenBraceToken */ || token() === 85 /* ExtendsKeyword */ || token() === 108 /* ImplementsKeyword */;
+                case 11 /* ArgumentExpressions */:
+                    // Tokens other than ')' are here for better error recovery
+                    return token() === 20 /* CloseParenToken */ || token() === 25 /* SemicolonToken */;
+                case 15 /* ArrayLiteralMembers */:
+                case 20 /* TupleElementTypes */:
+                case 10 /* ArrayBindingElements */:
+                    return token() === 22 /* CloseBracketToken */;
+                case 16 /* Parameters */:
+                case 17 /* RestProperties */:
+                    // Tokens other than ')' and ']' (the latter for index signatures) are here for better error recovery
+                    return token() === 20 /* CloseParenToken */ || token() === 22 /* CloseBracketToken */ /*|| token === SyntaxKind.OpenBraceToken*/;
+                case 19 /* TypeArguments */:
+                    // All other tokens should cause the type-argument to terminate except comma token
+                    return token() !== 26 /* CommaToken */;
+                case 21 /* HeritageClauses */:
+                    return token() === 17 /* OpenBraceToken */ || token() === 18 /* CloseBraceToken */;
+                case 13 /* JsxAttributes */:
+                    return token() === 29 /* GreaterThanToken */ || token() === 41 /* SlashToken */;
+                case 14 /* JsxChildren */:
+                    return token() === 27 /* LessThanToken */ && lookAhead(nextTokenIsSlash);
                 default:
                     return false;
             }
         }
         function isVariableDeclaratorListTerminator() {
+            // If we can consume a semicolon (either explicitly, or with ASI), then consider us done
+            // with parsing the list of variable declarators.
             if (canParseSemicolon()) {
                 return true;
             }
+            // in the case where we're parsing the variable declarator of a 'for-in' statement, we
+            // are done if we see an 'in' keyword in front of us. Same with for-of
             if (isInOrOfKeyword(token())) {
                 return true;
             }
-            if (token() === 36) {
+            // ERROR RECOVERY TWEAK:
+            // For better error recovery, if we see an '=>' then we just stop immediately.  We've got an
+            // arrow function here and it's going to be very unlikely that we'll resynchronize and get
+            // another variable declaration.
+            if (token() === 36 /* EqualsGreaterThanToken */) {
                 return true;
             }
+            // Keep trying to parse out variable declarators.
             return false;
         }
+        // True if positioned at element or terminator of the current list or any enclosing list
         function isInSomeParsingContext() {
-            for (var kind = 0; kind < 23; kind++) {
+            for (var kind = 0; kind < 23 /* Count */; kind++) {
                 if (parsingContext & (1 << kind)) {
-                    if (isListElement(kind, true) || isListTerminator(kind)) {
+                    if (isListElement(kind, /*inErrorRecovery*/ true) || isListTerminator(kind)) {
                         return true;
                     }
                 }
             }
             return false;
         }
+        // Parses a list of elements
         function parseList(kind, parseElement) {
             var saveParsingContext = parsingContext;
             parsingContext |= 1 << kind;
             var list = [];
             var listPos = getNodePos();
             while (!isListTerminator(kind)) {
-                if (isListElement(kind, false)) {
+                if (isListElement(kind, /*inErrorRecovery*/ false)) {
                     var element = parseListElement(kind, parseElement);
                     list.push(element);
                     continue;
@@ -13085,85 +16486,145 @@ var ts;
             return parseElement();
         }
         function currentNode(parsingContext) {
+            // If there is an outstanding parse error that we've encountered, but not attached to
+            // some node, then we cannot get a node from the old source tree.  This is because we
+            // want to mark the next node we encounter as being unusable.
+            //
+            // Note: This may be too conservative.  Perhaps we could reuse the node and set the bit
+            // on it (or its leftmost child) as having the error.  For now though, being conservative
+            // is nice and likely won't ever affect perf.
             if (parseErrorBeforeNextFinishedNode) {
                 return undefined;
             }
             if (!syntaxCursor) {
+                // if we don't have a cursor, we could never return a node from the old tree.
                 return undefined;
             }
             var node = syntaxCursor.currentNode(scanner.getStartPos());
+            // Can't reuse a missing node.
             if (ts.nodeIsMissing(node)) {
                 return undefined;
             }
+            // Can't reuse a node that intersected the change range.
             if (node.intersectsChange) {
                 return undefined;
             }
+            // Can't reuse a node that contains a parse error.  This is necessary so that we
+            // produce the same set of errors again.
             if (ts.containsParseError(node)) {
                 return undefined;
             }
-            var nodeContextFlags = node.flags & 12679168;
+            // We can only reuse a node if it was parsed under the same strict mode that we're
+            // currently in.  i.e. if we originally parsed a node in non-strict mode, but then
+            // the user added 'using strict' at the top of the file, then we can't use that node
+            // again as the presence of strict mode may cause us to parse the tokens in the file
+            // differently.
+            //
+            // Note: we *can* reuse tokens when the strict mode changes.  That's because tokens
+            // are unaffected by strict mode.  It's just the parser will decide what to do with it
+            // differently depending on what mode it is in.
+            //
+            // This also applies to all our other context flags as well.
+            var nodeContextFlags = node.flags & 12679168 /* ContextFlags */;
             if (nodeContextFlags !== contextFlags) {
                 return undefined;
             }
+            // Ok, we have a node that looks like it could be reused.  Now verify that it is valid
+            // in the current list parsing context that we're currently at.
             if (!canReuseNode(node, parsingContext)) {
                 return undefined;
             }
             if (node.jsDocCache) {
+                // jsDocCache may include tags from parent nodes, which might have been modified.
                 node.jsDocCache = undefined;
             }
             return node;
         }
         function consumeNode(node) {
+            // Move the scanner so it is after the node we just consumed.
             scanner.setTextPos(node.end);
             nextToken();
             return node;
         }
         function canReuseNode(node, parsingContext) {
             switch (parsingContext) {
-                case 5:
+                case 5 /* ClassMembers */:
                     return isReusableClassMember(node);
-                case 2:
+                case 2 /* SwitchClauses */:
                     return isReusableSwitchClause(node);
-                case 0:
-                case 1:
-                case 3:
+                case 0 /* SourceElements */:
+                case 1 /* BlockStatements */:
+                case 3 /* SwitchClauseStatements */:
                     return isReusableStatement(node);
-                case 6:
+                case 6 /* EnumMembers */:
                     return isReusableEnumMember(node);
-                case 4:
+                case 4 /* TypeMembers */:
                     return isReusableTypeMember(node);
-                case 8:
+                case 8 /* VariableDeclarations */:
                     return isReusableVariableDeclaration(node);
-                case 16:
+                case 16 /* Parameters */:
                     return isReusableParameter(node);
-                case 17:
+                case 17 /* RestProperties */:
                     return false;
-                case 21:
-                case 18:
-                case 20:
-                case 19:
-                case 11:
-                case 12:
-                case 7:
-                case 13:
-                case 14:
+                // Any other lists we do not care about reusing nodes in.  But feel free to add if
+                // you can do so safely.  Danger areas involve nodes that may involve speculative
+                // parsing.  If speculative parsing is involved with the node, then the range the
+                // parser reached while looking ahead might be in the edited range (see the example
+                // in canReuseVariableDeclaratorNode for a good case of this).
+                case 21 /* HeritageClauses */:
+                // This would probably be safe to reuse.  There is no speculative parsing with
+                // heritage clauses.
+                case 18 /* TypeParameters */:
+                // This would probably be safe to reuse.  There is no speculative parsing with
+                // type parameters.  Note that that's because type *parameters* only occur in
+                // unambiguous *type* contexts.  While type *arguments* occur in very ambiguous
+                // *expression* contexts.
+                case 20 /* TupleElementTypes */:
+                // This would probably be safe to reuse.  There is no speculative parsing with
+                // tuple types.
+                // Technically, type argument list types are probably safe to reuse.  While
+                // speculative parsing is involved with them (since type argument lists are only
+                // produced from speculative parsing a < as a type argument list), we only have
+                // the types because speculative parsing succeeded.  Thus, the lookahead never
+                // went past the end of the list and rewound.
+                case 19 /* TypeArguments */:
+                // Note: these are almost certainly not safe to ever reuse.  Expressions commonly
+                // need a large amount of lookahead, and we should not reuse them as they may
+                // have actually intersected the edit.
+                case 11 /* ArgumentExpressions */:
+                // This is not safe to reuse for the same reason as the 'AssignmentExpression'
+                // cases.  i.e. a property assignment may end with an expression, and thus might
+                // have lookahead far beyond it's old node.
+                case 12 /* ObjectLiteralMembers */:
+                // This is probably not safe to reuse.  There can be speculative parsing with
+                // type names in a heritage clause.  There can be generic names in the type
+                // name list, and there can be left hand side expressions (which can have type
+                // arguments.)
+                case 7 /* HeritageClauseElement */:
+                // Perhaps safe to reuse, but it's unlikely we'd see more than a dozen attributes
+                // on any given element. Same for children.
+                case 13 /* JsxAttributes */:
+                case 14 /* JsxChildren */:
             }
             return false;
         }
         function isReusableClassMember(node) {
             if (node) {
                 switch (node.kind) {
-                    case 155:
-                    case 160:
-                    case 156:
-                    case 157:
-                    case 152:
-                    case 212:
+                    case 155 /* Constructor */:
+                    case 160 /* IndexSignature */:
+                    case 156 /* GetAccessor */:
+                    case 157 /* SetAccessor */:
+                    case 152 /* PropertyDeclaration */:
+                    case 212 /* SemicolonClassElement */:
                         return true;
-                    case 154:
+                    case 154 /* MethodDeclaration */:
+                        // Method declarations are not necessarily reusable.  An object-literal
+                        // may have a method calls "constructor(...)" and we must reparse that
+                        // into an actual .ConstructorDeclaration.
                         var methodDeclaration = node;
-                        var nameIsConstructor = methodDeclaration.name.kind === 71 &&
-                            methodDeclaration.name.originalKeywordKind === 123;
+                        var nameIsConstructor = methodDeclaration.name.kind === 71 /* Identifier */ &&
+                            methodDeclaration.name.originalKeywordKind === 123 /* ConstructorKeyword */;
                         return !nameIsConstructor;
                 }
             }
@@ -13172,8 +16633,8 @@ var ts;
         function isReusableSwitchClause(node) {
             if (node) {
                 switch (node.kind) {
-                    case 266:
-                    case 267:
+                    case 266 /* CaseClause */:
+                    case 267 /* DefaultClause */:
                         return true;
                 }
             }
@@ -13182,70 +16643,86 @@ var ts;
         function isReusableStatement(node) {
             if (node) {
                 switch (node.kind) {
-                    case 234:
-                    case 214:
-                    case 213:
-                    case 217:
-                    case 216:
-                    case 229:
-                    case 225:
-                    case 227:
-                    case 224:
-                    case 223:
-                    case 221:
-                    case 222:
-                    case 220:
-                    case 219:
-                    case 226:
-                    case 215:
-                    case 230:
-                    case 228:
-                    case 218:
-                    case 231:
-                    case 244:
-                    case 243:
-                    case 250:
-                    case 249:
-                    case 239:
-                    case 235:
-                    case 236:
-                    case 238:
-                    case 237:
+                    case 234 /* FunctionDeclaration */:
+                    case 214 /* VariableStatement */:
+                    case 213 /* Block */:
+                    case 217 /* IfStatement */:
+                    case 216 /* ExpressionStatement */:
+                    case 229 /* ThrowStatement */:
+                    case 225 /* ReturnStatement */:
+                    case 227 /* SwitchStatement */:
+                    case 224 /* BreakStatement */:
+                    case 223 /* ContinueStatement */:
+                    case 221 /* ForInStatement */:
+                    case 222 /* ForOfStatement */:
+                    case 220 /* ForStatement */:
+                    case 219 /* WhileStatement */:
+                    case 226 /* WithStatement */:
+                    case 215 /* EmptyStatement */:
+                    case 230 /* TryStatement */:
+                    case 228 /* LabeledStatement */:
+                    case 218 /* DoStatement */:
+                    case 231 /* DebuggerStatement */:
+                    case 244 /* ImportDeclaration */:
+                    case 243 /* ImportEqualsDeclaration */:
+                    case 250 /* ExportDeclaration */:
+                    case 249 /* ExportAssignment */:
+                    case 239 /* ModuleDeclaration */:
+                    case 235 /* ClassDeclaration */:
+                    case 236 /* InterfaceDeclaration */:
+                    case 238 /* EnumDeclaration */:
+                    case 237 /* TypeAliasDeclaration */:
                         return true;
                 }
             }
             return false;
         }
         function isReusableEnumMember(node) {
-            return node.kind === 273;
+            return node.kind === 273 /* EnumMember */;
         }
         function isReusableTypeMember(node) {
             if (node) {
                 switch (node.kind) {
-                    case 159:
-                    case 153:
-                    case 160:
-                    case 151:
-                    case 158:
+                    case 159 /* ConstructSignature */:
+                    case 153 /* MethodSignature */:
+                    case 160 /* IndexSignature */:
+                    case 151 /* PropertySignature */:
+                    case 158 /* CallSignature */:
                         return true;
                 }
             }
             return false;
         }
         function isReusableVariableDeclaration(node) {
-            if (node.kind !== 232) {
+            if (node.kind !== 232 /* VariableDeclaration */) {
                 return false;
             }
+            // Very subtle incremental parsing bug.  Consider the following code:
+            //
+            //      let v = new List < A, B
+            //
+            // This is actually legal code.  It's a list of variable declarators "v = new List<A"
+            // on one side and "B" on the other. If you then change that to:
+            //
+            //      let v = new List < A, B >()
+            //
+            // then we have a problem.  "v = new List<A" doesn't intersect the change range, so we
+            // start reparsing at "B" and we completely fail to handle this properly.
+            //
+            // In order to prevent this, we do not allow a variable declarator to be reused if it
+            // has an initializer.
             var variableDeclarator = node;
             return variableDeclarator.initializer === undefined;
         }
         function isReusableParameter(node) {
-            if (node.kind !== 149) {
+            if (node.kind !== 149 /* Parameter */) {
                 return false;
             }
+            // See the comment in isReusableVariableDeclaration for why we do this.
             var parameter = node;
             return parameter.initializer === undefined;
         }
+        // Returns true if we should abort parsing.
         function abortParsingListOrMoveToNextToken(kind) {
             parseErrorAtCurrentToken(parsingContextErrors(kind));
             if (isInSomeParsingContext()) {
@@ -13256,55 +16733,68 @@ var ts;
         }
         function parsingContextErrors(context) {
             switch (context) {
-                case 0: return ts.Diagnostics.Declaration_or_statement_expected;
-                case 1: return ts.Diagnostics.Declaration_or_statement_expected;
-                case 2: return ts.Diagnostics.case_or_default_expected;
-                case 3: return ts.Diagnostics.Statement_expected;
-                case 17:
-                case 4: return ts.Diagnostics.Property_or_signature_expected;
-                case 5: return ts.Diagnostics.Unexpected_token_A_constructor_method_accessor_or_property_was_expected;
-                case 6: return ts.Diagnostics.Enum_member_expected;
-                case 7: return ts.Diagnostics.Expression_expected;
-                case 8: return ts.Diagnostics.Variable_declaration_expected;
-                case 9: return ts.Diagnostics.Property_destructuring_pattern_expected;
-                case 10: return ts.Diagnostics.Array_element_destructuring_pattern_expected;
-                case 11: return ts.Diagnostics.Argument_expression_expected;
-                case 12: return ts.Diagnostics.Property_assignment_expected;
-                case 15: return ts.Diagnostics.Expression_or_comma_expected;
-                case 16: return ts.Diagnostics.Parameter_declaration_expected;
-                case 18: return ts.Diagnostics.Type_parameter_declaration_expected;
-                case 19: return ts.Diagnostics.Type_argument_expected;
-                case 20: return ts.Diagnostics.Type_expected;
-                case 21: return ts.Diagnostics.Unexpected_token_expected;
-                case 22: return ts.Diagnostics.Identifier_expected;
-                case 13: return ts.Diagnostics.Identifier_expected;
-                case 14: return ts.Diagnostics.Identifier_expected;
-                default: return undefined;
+                case 0 /* SourceElements */: return ts.Diagnostics.Declaration_or_statement_expected;
+                case 1 /* BlockStatements */: return ts.Diagnostics.Declaration_or_statement_expected;
+                case 2 /* SwitchClauses */: return ts.Diagnostics.case_or_default_expected;
+                case 3 /* SwitchClauseStatements */: return ts.Diagnostics.Statement_expected;
+                case 17 /* RestProperties */: // fallthrough
+                case 4 /* TypeMembers */: return ts.Diagnostics.Property_or_signature_expected;
+                case 5 /* ClassMembers */: return ts.Diagnostics.Unexpected_token_A_constructor_method_accessor_or_property_was_expected;
+                case 6 /* EnumMembers */: return ts.Diagnostics.Enum_member_expected;
+                case 7 /* HeritageClauseElement */: return ts.Diagnostics.Expression_expected;
+                case 8 /* VariableDeclarations */: return ts.Diagnostics.Variable_declaration_expected;
+                case 9 /* ObjectBindingElements */: return ts.Diagnostics.Property_destructuring_pattern_expected;
+                case 10 /* ArrayBindingElements */: return ts.Diagnostics.Array_element_destructuring_pattern_expected;
+                case 11 /* ArgumentExpressions */: return ts.Diagnostics.Argument_expression_expected;
+                case 12 /* ObjectLiteralMembers */: return ts.Diagnostics.Property_assignment_expected;
+                case 15 /* ArrayLiteralMembers */: return ts.Diagnostics.Expression_or_comma_expected;
+                case 16 /* Parameters */: return ts.Diagnostics.Parameter_declaration_expected;
+                case 18 /* TypeParameters */: return ts.Diagnostics.Type_parameter_declaration_expected;
+                case 19 /* TypeArguments */: return ts.Diagnostics.Type_argument_expected;
+                case 20 /* TupleElementTypes */: return ts.Diagnostics.Type_expected;
+                case 21 /* HeritageClauses */: return ts.Diagnostics.Unexpected_token_expected;
+                case 22 /* ImportOrExportSpecifiers */: return ts.Diagnostics.Identifier_expected;
+                case 13 /* JsxAttributes */: return ts.Diagnostics.Identifier_expected;
+                case 14 /* JsxChildren */: return ts.Diagnostics.Identifier_expected;
+                default: return undefined; // TODO: GH#18217 `default: Debug.assertNever(context);`
             }
         }
+        // Parses a comma-delimited list of elements
         function parseDelimitedList(kind, parseElement, considerSemicolonAsDelimiter) {
             var saveParsingContext = parsingContext;
             parsingContext |= 1 << kind;
             var list = [];
             var listPos = getNodePos();
-            var commaStart = -1;
+            var commaStart = -1; // Meaning the previous token was not a comma
             while (true) {
-                if (isListElement(kind, false)) {
+                if (isListElement(kind, /*inErrorRecovery*/ false)) {
                     var startPos = scanner.getStartPos();
                     list.push(parseListElement(kind, parseElement));
                     commaStart = scanner.getTokenPos();
-                    if (parseOptional(26)) {
+                    if (parseOptional(26 /* CommaToken */)) {
+                        // No need to check for a zero length node since we know we parsed a comma
                         continue;
                     }
-                    commaStart = -1;
+                    commaStart = -1; // Back to the state where the last token was not a comma
                     if (isListTerminator(kind)) {
                         break;
                     }
-                    parseExpected(26);
-                    if (considerSemicolonAsDelimiter && token() === 25 && !scanner.hasPrecedingLineBreak()) {
+                    // We didn't get a comma, and the list wasn't terminated, explicitly parse
+                    // out a comma so we give a good error message.
+                    parseExpected(26 /* CommaToken */);
+                    // If the token was a semicolon, and the caller allows that, then skip it and
+                    // continue.  This ensures we get back on track and don't result in tons of
+                    // parse errors.  For example, this can happen when people do things like use
+                    // a semicolon to delimit object literal members.   Note: we'll have already
+                    // reported an error when we called parseExpected above.
+                    if (considerSemicolonAsDelimiter && token() === 25 /* SemicolonToken */ && !scanner.hasPrecedingLineBreak()) {
                         nextToken();
                     }
                     if (startPos === scanner.getStartPos()) {
+                        // What we're parsing isn't actually remotely recognizable as a element and we've consumed no tokens whatsoever
+                        // Consume a token to advance the parser in some way and avoid an infinite loop
+                        // This can happen when we're speculatively parsing parenthesized expressions which we think may be arrow functions,
+                        // or when a modifier keyword which is disallowed as a parameter name (ie, `static` in strict mode) is supplied
                         nextToken();
                     }
                     continue;
@@ -13318,7 +16808,13 @@ var ts;
             }
             parsingContext = saveParsingContext;
             var result = createNodeArray(list, listPos);
+            // Recording the trailing comma is deliberately done after the previous
+            // loop, and not just if we see a list terminator. This is because the list
+            // may have ended incorrectly, but it is still important to know if there
+            // was a trailing comma.
+            // Check if the last token was a comma.
             if (commaStart >= 0) {
+                // Always preserve a trailing comma by marking it on the NodeArray
                 result.hasTrailingComma = true;
             }
             return result;
@@ -13337,8 +16833,9 @@ var ts;
         function parseEntityName(allowReservedWords, diagnosticMessage) {
             var entity = allowReservedWords ? parseIdentifierName(diagnosticMessage) : parseIdentifier(diagnosticMessage);
             var dotPos = scanner.getStartPos();
-            while (parseOptional(23)) {
-                if (token() === 27) {
+            while (parseOptional(23 /* DotToken */)) {
+                if (token() === 27 /* LessThanToken */) {
+                    // the entity is part of a JSDoc-style generic, so record the trailing dot for later error reporting
                     entity.jsdocDotPos = dotPos;
                     break;
                 }
@@ -13348,42 +16845,64 @@ var ts;
             return entity;
         }
         function createQualifiedName(entity, name) {
-            var node = createNode(146, entity.pos);
+            var node = createNode(146 /* QualifiedName */, entity.pos);
             node.left = entity;
             node.right = name;
             return finishNode(node);
         }
         function parseRightSideOfDot(allowIdentifierNames) {
+            // Technically a keyword is valid here as all identifiers and keywords are identifier names.
+            // However, often we'll encounter this in error situations when the identifier or keyword
+            // is actually starting another valid construct.
+            //
+            // So, we check for the following specific case:
+            //
+            //      name.
+            //      identifierOrKeyword identifierNameOrKeyword
+            //
+            // Note: the newlines are important here.  For example, if that above code
+            // were rewritten into:
+            //
+            //      name.identifierOrKeyword
+            //      identifierNameOrKeyword
+            //
+            // Then we would consider it valid.  That's because ASI would take effect and
+            // the code would be implicitly: "name.identifierOrKeyword; identifierNameOrKeyword".
+            // In the first case though, ASI will not take effect because there is not a
+            // line terminator after the identifier or keyword.
             if (scanner.hasPrecedingLineBreak() && ts.tokenIsIdentifierOrKeyword(token())) {
                 var matchesPattern = lookAhead(nextTokenIsIdentifierOrKeywordOnSameLine);
                 if (matchesPattern) {
-                    return createMissingNode(71, true, ts.Diagnostics.Identifier_expected);
+                    // Report that we need an identifier.  However, report it right after the dot,
+                    // and not on the next token.  This is because the next token might actually
+                    // be an identifier and the error would be quite confusing.
+                    return createMissingNode(71 /* Identifier */, /*reportAtCurrentPosition*/ true, ts.Diagnostics.Identifier_expected);
                 }
             }
             return allowIdentifierNames ? parseIdentifierName() : parseIdentifier();
         }
         function parseTemplateExpression() {
-            var template = createNode(202);
+            var template = createNode(202 /* TemplateExpression */);
             template.head = parseTemplateHead();
-            ts.Debug.assert(template.head.kind === 14, "Template head has wrong token kind");
+            ts.Debug.assert(template.head.kind === 14 /* TemplateHead */, "Template head has wrong token kind");
             var list = [];
             var listPos = getNodePos();
             do {
                 list.push(parseTemplateSpan());
-            } while (ts.last(list).literal.kind === 15);
+            } while (ts.last(list).literal.kind === 15 /* TemplateMiddle */);
             template.templateSpans = createNodeArray(list, listPos);
             return finishNode(template);
         }
         function parseTemplateSpan() {
-            var span = createNode(211);
+            var span = createNode(211 /* TemplateSpan */);
             span.expression = allowInAnd(parseExpression);
             var literal;
-            if (token() === 18) {
+            if (token() === 18 /* CloseBraceToken */) {
                 reScanTemplateToken();
                 literal = parseTemplateMiddleOrTemplateTail();
             }
             else {
-                literal = parseExpectedToken(16, ts.Diagnostics._0_expected, ts.tokenToString(18));
+                literal = parseExpectedToken(16 /* TemplateTail */, ts.Diagnostics._0_expected, ts.tokenToString(18 /* CloseBraceToken */));
             }
             span.literal = literal;
             return finishNode(span);
@@ -13393,12 +16912,12 @@ var ts;
         }
         function parseTemplateHead() {
             var fragment = parseLiteralLikeNode(token());
-            ts.Debug.assert(fragment.kind === 14, "Template head has wrong token kind");
+            ts.Debug.assert(fragment.kind === 14 /* TemplateHead */, "Template head has wrong token kind");
             return fragment;
         }
         function parseTemplateMiddleOrTemplateTail() {
             var fragment = parseLiteralLikeNode(token());
-            ts.Debug.assert(fragment.kind === 15 || fragment.kind === 16, "Template fragment has wrong token kind");
+            ts.Debug.assert(fragment.kind === 15 /* TemplateMiddle */ || fragment.kind === 16 /* TemplateTail */, "Template fragment has wrong token kind");
             return fragment;
         }
         function parseLiteralLikeNode(kind) {
@@ -13411,37 +16930,61 @@ var ts;
             if (scanner.isUnterminated()) {
                 node.isUnterminated = true;
             }
-            if (node.kind === 8) {
-                node.numericLiteralFlags = scanner.getTokenFlags() & 1008;
+            // Octal literals are not allowed in strict mode or ES5
+            // Note that theoretically the following condition would hold true literals like 009,
+            // which is not octal.But because of how the scanner separates the tokens, we would
+            // never get a token like this. Instead, we would get 00 and 9 as two separate tokens.
+            // We also do not need to check for negatives because any prefix operator would be part of a
+            // parent unary expression.
+            if (node.kind === 8 /* NumericLiteral */) {
+                node.numericLiteralFlags = scanner.getTokenFlags() & 1008 /* NumericLiteralFlags */;
             }
             nextToken();
             finishNode(node);
             return node;
         }
+        // TYPES
         function parseTypeReference() {
-            var node = createNode(162);
-            node.typeName = parseEntityName(true, ts.Diagnostics.Type_expected);
-            if (!scanner.hasPrecedingLineBreak() && token() === 27) {
-                node.typeArguments = parseBracketedList(19, parseType, 27, 29);
+            var node = createNode(162 /* TypeReference */);
+            node.typeName = parseEntityName(/*allowReservedWords*/ true, ts.Diagnostics.Type_expected);
+            if (!scanner.hasPrecedingLineBreak() && token() === 27 /* LessThanToken */) {
+                node.typeArguments = parseBracketedList(19 /* TypeArguments */, parseType, 27 /* LessThanToken */, 29 /* GreaterThanToken */);
             }
             return finishNode(node);
         }
+        // If true, we should abort parsing an error function.
+        function typeHasArrowFunctionBlockingParseError(node) {
+            switch (node.kind) {
+                case 162 /* TypeReference */:
+                    return ts.nodeIsMissing(node.typeName);
+                case 163 /* FunctionType */:
+                case 164 /* ConstructorType */: {
+                    var _a = node, parameters = _a.parameters, type = _a.type;
+                    // parameters.pos === parameters.end only if we used parseMissingList, else should contain at least `()`
+                    return parameters.pos === parameters.end || typeHasArrowFunctionBlockingParseError(type);
+                }
+                case 173 /* ParenthesizedType */:
+                    return typeHasArrowFunctionBlockingParseError(node.type);
+                default:
+                    return false;
+            }
+        }
         function parseThisTypePredicate(lhs) {
             nextToken();
-            var node = createNode(161, lhs.pos);
+            var node = createNode(161 /* TypePredicate */, lhs.pos);
             node.parameterName = lhs;
             node.type = parseType();
             return finishNode(node);
         }
         function parseThisTypeNode() {
-            var node = createNode(174);
+            var node = createNode(174 /* ThisType */);
             nextToken();
             return finishNode(node);
         }
         function parseJSDocAllType(postFixEquals) {
-            var result = createNode(279);
+            var result = createNode(279 /* JSDocAllType */);
             if (postFixEquals) {
-                return createJSDocPostfixType(283, result);
+                return createJSDocPostfixType(283 /* JSDocOptionalType */, result);
             }
             else {
                 nextToken();
@@ -13449,184 +16992,252 @@ var ts;
             return finishNode(result);
         }
         function parseJSDocNonNullableType() {
-            var result = createNode(282);
+            var result = createNode(282 /* JSDocNonNullableType */);
             nextToken();
             result.type = parseNonArrayType();
             return finishNode(result);
         }
         function parseJSDocUnknownOrNullableType() {
             var pos = scanner.getStartPos();
+            // skip the ?
             nextToken();
-            if (token() === 26 ||
-                token() === 18 ||
-                token() === 20 ||
-                token() === 29 ||
-                token() === 58 ||
-                token() === 49) {
-                var result = createNode(280, pos);
+            // Need to lookahead to decide if this is a nullable or unknown type.
+            // Here are cases where we'll pick the unknown type:
+            //
+            //      Foo(?,
+            //      { a: ? }
+            //      Foo(?)
+            //      Foo<?>
+            //      Foo(?=
+            //      (?|
+            if (token() === 26 /* CommaToken */ ||
+                token() === 18 /* CloseBraceToken */ ||
+                token() === 20 /* CloseParenToken */ ||
+                token() === 29 /* GreaterThanToken */ ||
+                token() === 58 /* EqualsToken */ ||
+                token() === 49 /* BarToken */) {
+                var result = createNode(280 /* JSDocUnknownType */, pos);
                 return finishNode(result);
             }
             else {
-                var result = createNode(281, pos);
+                var result = createNode(281 /* JSDocNullableType */, pos);
                 result.type = parseType();
                 return finishNode(result);
             }
         }
         function parseJSDocFunctionType() {
             if (lookAhead(nextTokenIsOpenParen)) {
-                var result = createNodeWithJSDoc(284);
+                var result = createNodeWithJSDoc(284 /* JSDocFunctionType */);
                 nextToken();
-                fillSignature(56, 4 | 32, result);
+                fillSignature(56 /* ColonToken */, 4 /* Type */ | 32 /* JSDoc */, result);
                 return finishNode(result);
             }
-            var node = createNode(162);
+            var node = createNode(162 /* TypeReference */);
             node.typeName = parseIdentifierName();
             return finishNode(node);
         }
         function parseJSDocParameter() {
-            var parameter = createNode(149);
-            if (token() === 99 || token() === 94) {
+            var parameter = createNode(149 /* Parameter */);
+            if (token() === 99 /* ThisKeyword */ || token() === 94 /* NewKeyword */) {
                 parameter.name = parseIdentifierName();
-                parseExpected(56);
+                parseExpected(56 /* ColonToken */);
             }
             parameter.type = parseJSDocType();
             return finishNode(parameter);
         }
         function parseJSDocType() {
-            var dotdotdot = parseOptionalToken(24);
+            var dotdotdot = parseOptionalToken(24 /* DotDotDotToken */);
             var type = parseType();
             if (dotdotdot) {
-                var variadic = createNode(285, dotdotdot.pos);
+                var variadic = createNode(285 /* JSDocVariadicType */, dotdotdot.pos);
                 variadic.type = type;
                 type = finishNode(variadic);
             }
-            if (token() === 58) {
-                return createJSDocPostfixType(283, type);
+            if (token() === 58 /* EqualsToken */) {
+                return createJSDocPostfixType(283 /* JSDocOptionalType */, type);
             }
             return type;
         }
         function parseTypeQuery() {
-            var node = createNode(165);
-            parseExpected(103);
-            node.exprName = parseEntityName(true);
+            var node = createNode(165 /* TypeQuery */);
+            parseExpected(103 /* TypeOfKeyword */);
+            node.exprName = parseEntityName(/*allowReservedWords*/ true);
             return finishNode(node);
         }
         function parseTypeParameter() {
-            var node = createNode(148);
+            var node = createNode(148 /* TypeParameter */);
             node.name = parseIdentifier();
-            if (parseOptional(85)) {
+            if (parseOptional(85 /* ExtendsKeyword */)) {
+                // It's not uncommon for people to write improper constraints to a generic.  If the
+                // user writes a constraint that is an expression and not an actual type, then parse
+                // it out as an expression (so we can recover well), but report that a type is needed
+                // instead.
                 if (isStartOfType() || !isStartOfExpression()) {
                     node.constraint = parseType();
                 }
                 else {
+                    // It was not a type, and it looked like an expression.  Parse out an expression
+                    // here so we recover well.  Note: it is important that we call parseUnaryExpression
+                    // and not parseExpression here.  If the user has:
+                    //
+                    //      <T extends "">
+                    //
+                    // We do *not* want to consume the `>` as we're consuming the expression for "".
                     node.expression = parseUnaryExpressionOrHigher();
                 }
             }
-            if (parseOptional(58)) {
+            if (parseOptional(58 /* EqualsToken */)) {
                 node.default = parseType();
             }
             return finishNode(node);
         }
         function parseTypeParameters() {
-            if (token() === 27) {
-                return parseBracketedList(18, parseTypeParameter, 27, 29);
+            if (token() === 27 /* LessThanToken */) {
+                return parseBracketedList(18 /* TypeParameters */, parseTypeParameter, 27 /* LessThanToken */, 29 /* GreaterThanToken */);
             }
         }
         function parseParameterType() {
-            if (parseOptional(56)) {
+            if (parseOptional(56 /* ColonToken */)) {
                 return parseType();
             }
             return undefined;
         }
         function isStartOfParameter() {
-            return token() === 24 ||
+            return token() === 24 /* DotDotDotToken */ ||
                 isIdentifierOrPattern() ||
                 ts.isModifierKind(token()) ||
-                token() === 57 ||
-                isStartOfType(true);
+                token() === 57 /* AtToken */ ||
+                isStartOfType(/*inStartOfParameter*/ true);
         }
         function parseParameter() {
-            var node = createNodeWithJSDoc(149);
-            if (token() === 99) {
-                node.name = createIdentifier(true);
+            var node = createNodeWithJSDoc(149 /* Parameter */);
+            if (token() === 99 /* ThisKeyword */) {
+                node.name = createIdentifier(/*isIdentifier*/ true);
                 node.type = parseParameterType();
                 return finishNode(node);
             }
             node.decorators = parseDecorators();
             node.modifiers = parseModifiers();
-            node.dotDotDotToken = parseOptionalToken(24);
+            node.dotDotDotToken = parseOptionalToken(24 /* DotDotDotToken */);
+            // FormalParameter [Yield,Await]:
+            //      BindingElement[?Yield,?Await]
             node.name = parseIdentifierOrPattern();
             if (ts.getFullWidth(node.name) === 0 && !ts.hasModifiers(node) && ts.isModifierKind(token())) {
+                // in cases like
+                // 'use strict'
+                // function foo(static)
+                // isParameter('static') === true, because of isModifier('static')
+                // however 'static' is not a legal identifier in a strict mode.
+                // so result of this function will be ParameterDeclaration (flags = 0, name = missing, type = undefined, initializer = undefined)
+                // and current token will not change => parsing of the enclosing parameter list will last till the end of time (or OOM)
+                // to avoid this we'll advance cursor to the next token.
                 nextToken();
             }
-            node.questionToken = parseOptionalToken(55);
+            node.questionToken = parseOptionalToken(55 /* QuestionToken */);
             node.type = parseParameterType();
             node.initializer = parseInitializer();
             return finishNode(node);
         }
+        /**
+         * Note: If returnToken is EqualsGreaterThanToken, `signature.type` will always be defined.
+         * @returns If return type parsing succeeds
+         */
         function fillSignature(returnToken, flags, signature) {
-            if (!(flags & 32)) {
+            if (!(flags & 32 /* JSDoc */)) {
                 signature.typeParameters = parseTypeParameters();
             }
-            signature.parameters = parseParameterList(flags);
-            if (shouldParseReturnType(returnToken, !!(flags & 4))) {
+            var parametersParsedSuccessfully = parseParameterList(signature, flags);
+            if (shouldParseReturnType(returnToken, !!(flags & 4 /* Type */))) {
                 signature.type = parseTypeOrTypePredicate();
-                return signature.type !== undefined;
+                if (typeHasArrowFunctionBlockingParseError(signature.type))
+                    return false;
             }
-            return true;
+            return parametersParsedSuccessfully;
         }
         function shouldParseReturnType(returnToken, isType) {
-            if (returnToken === 36) {
+            if (returnToken === 36 /* EqualsGreaterThanToken */) {
                 parseExpected(returnToken);
                 return true;
             }
-            else if (parseOptional(56)) {
+            else if (parseOptional(56 /* ColonToken */)) {
                 return true;
             }
-            else if (isType && token() === 36) {
-                parseErrorAtCurrentToken(ts.Diagnostics._0_expected, ts.tokenToString(56));
+            else if (isType && token() === 36 /* EqualsGreaterThanToken */) {
+                // This is easy to get backward, especially in type contexts, so parse the type anyway
+                parseErrorAtCurrentToken(ts.Diagnostics._0_expected, ts.tokenToString(56 /* ColonToken */));
                 nextToken();
                 return true;
             }
             return false;
         }
-        function parseParameterList(flags) {
-            if (parseExpected(19)) {
-                var savedYieldContext = inYieldContext();
-                var savedAwaitContext = inAwaitContext();
-                setYieldContext(!!(flags & 1));
-                setAwaitContext(!!(flags & 2));
-                var result = parseDelimitedList(16, flags & 32 ? parseJSDocParameter : parseParameter);
-                setYieldContext(savedYieldContext);
-                setAwaitContext(savedAwaitContext);
-                if (!parseExpected(20) && (flags & 8)) {
-                    return undefined;
-                }
-                return result;
+        // Returns true on success.
+        function parseParameterList(signature, flags) {
+            // FormalParameters [Yield,Await]: (modified)
+            //      [empty]
+            //      FormalParameterList[?Yield,Await]
+            //
+            // FormalParameter[Yield,Await]: (modified)
+            //      BindingElement[?Yield,Await]
+            //
+            // BindingElement [Yield,Await]: (modified)
+            //      SingleNameBinding[?Yield,?Await]
+            //      BindingPattern[?Yield,?Await]Initializer [In, ?Yield,?Await] opt
+            //
+            // SingleNameBinding [Yield,Await]:
+            //      BindingIdentifier[?Yield,?Await]Initializer [In, ?Yield,?Await] opt
+            if (!parseExpected(19 /* OpenParenToken */)) {
+                signature.parameters = createMissingList();
+                return false;
             }
-            return (flags & 8) ? undefined : createMissingList();
+            var savedYieldContext = inYieldContext();
+            var savedAwaitContext = inAwaitContext();
+            setYieldContext(!!(flags & 1 /* Yield */));
+            setAwaitContext(!!(flags & 2 /* Await */));
+            signature.parameters = parseDelimitedList(16 /* Parameters */, flags & 32 /* JSDoc */ ? parseJSDocParameter : parseParameter);
+            setYieldContext(savedYieldContext);
+            setAwaitContext(savedAwaitContext);
+            return parseExpected(20 /* CloseParenToken */);
         }
         function parseTypeMemberSemicolon() {
-            if (parseOptional(26)) {
+            // We allow type members to be separated by commas or (possibly ASI) semicolons.
+            // First check if it was a comma.  If so, we're done with the member.
+            if (parseOptional(26 /* CommaToken */)) {
                 return;
             }
+            // Didn't have a comma.  We must have a (possible ASI) semicolon.
             parseSemicolon();
         }
         function parseSignatureMember(kind) {
             var node = createNodeWithJSDoc(kind);
-            if (kind === 159) {
-                parseExpected(94);
+            if (kind === 159 /* ConstructSignature */) {
+                parseExpected(94 /* NewKeyword */);
             }
-            fillSignature(56, 4, node);
+            fillSignature(56 /* ColonToken */, 4 /* Type */, node);
             parseTypeMemberSemicolon();
             return finishNode(node);
         }
         function isIndexSignature() {
-            return token() === 21 && lookAhead(isUnambiguouslyIndexSignature);
+            return token() === 21 /* OpenBracketToken */ && lookAhead(isUnambiguouslyIndexSignature);
         }
         function isUnambiguouslyIndexSignature() {
+            // The only allowed sequence is:
+            //
+            //   [id:
+            //
+            // However, for error recovery, we also check the following cases:
+            //
+            //   [...
+            //   [id,
+            //   [id?,
+            //   [id?:
+            //   [id?]
+            //   [public id
+            //   [private id
+            //   [protected id
+            //   []
+            //
             nextToken();
-            if (token() === 24 || token() === 22) {
+            if (token() === 24 /* DotDotDotToken */ || token() === 22 /* CloseBracketToken */) {
                 return true;
             }
             if (ts.isModifierKind(token())) {
@@ -13639,35 +17250,48 @@ var ts;
                 return false;
             }
             else {
+                // Skip the identifier
                 nextToken();
             }
-            if (token() === 56 || token() === 26) {
+            // A colon signifies a well formed indexer
+            // A comma should be a badly formed indexer because comma expressions are not allowed
+            // in computed properties.
+            if (token() === 56 /* ColonToken */ || token() === 26 /* CommaToken */) {
                 return true;
             }
-            if (token() !== 55) {
+            // Question mark could be an indexer with an optional property,
+            // or it could be a conditional expression in a computed property.
+            if (token() !== 55 /* QuestionToken */) {
                 return false;
             }
+            // If any of the following tokens are after the question mark, it cannot
+            // be a conditional expression, so treat it as an indexer.
             nextToken();
-            return token() === 56 || token() === 26 || token() === 22;
+            return token() === 56 /* ColonToken */ || token() === 26 /* CommaToken */ || token() === 22 /* CloseBracketToken */;
         }
         function parseIndexSignatureDeclaration(node) {
-            node.kind = 160;
-            node.parameters = parseBracketedList(16, parseParameter, 21, 22);
+            node.kind = 160 /* IndexSignature */;
+            node.parameters = parseBracketedList(16 /* Parameters */, parseParameter, 21 /* OpenBracketToken */, 22 /* CloseBracketToken */);
             node.type = parseTypeAnnotation();
             parseTypeMemberSemicolon();
             return finishNode(node);
         }
         function parsePropertyOrMethodSignature(node) {
             node.name = parsePropertyName();
-            node.questionToken = parseOptionalToken(55);
-            if (token() === 19 || token() === 27) {
-                node.kind = 153;
-                fillSignature(56, 4, node);
+            node.questionToken = parseOptionalToken(55 /* QuestionToken */);
+            if (token() === 19 /* OpenParenToken */ || token() === 27 /* LessThanToken */) {
+                node.kind = 153 /* MethodSignature */;
+                // Method signatures don't exist in expression contexts.  So they have neither
+                // [Yield] nor [Await]
+                fillSignature(56 /* ColonToken */, 4 /* Type */, node);
             }
             else {
-                node.kind = 151;
+                node.kind = 151 /* PropertySignature */;
                 node.type = parseTypeAnnotation();
-                if (token() === 58) {
+                if (token() === 58 /* EqualsToken */) {
+                    // Although type literal properties cannot not have initializers, we attempt
+                    // to parse an initializer so we can report in the checker that an interface
+                    // property or type literal property cannot have an initializer.
                     node.initializer = parseInitializer();
                 }
             }
@@ -13675,39 +17299,45 @@ var ts;
             return finishNode(node);
         }
         function isTypeMemberStart() {
-            if (token() === 19 || token() === 27) {
+            // Return true if we have the start of a signature member
+            if (token() === 19 /* OpenParenToken */ || token() === 27 /* LessThanToken */) {
                 return true;
             }
             var idToken = false;
+            // Eat up all modifiers, but hold on to the last one in case it is actually an identifier
             while (ts.isModifierKind(token())) {
                 idToken = true;
                 nextToken();
             }
-            if (token() === 21) {
+            // Index signatures and computed property names are type members
+            if (token() === 21 /* OpenBracketToken */) {
                 return true;
             }
+            // Try to get the first property-like token following all modifiers
             if (isLiteralPropertyName()) {
                 idToken = true;
                 nextToken();
             }
+            // If we were able to get any potential identifier, check that it is
+            // the start of a member declaration
             if (idToken) {
-                return token() === 19 ||
-                    token() === 27 ||
-                    token() === 55 ||
-                    token() === 56 ||
-                    token() === 26 ||
+                return token() === 19 /* OpenParenToken */ ||
+                    token() === 27 /* LessThanToken */ ||
+                    token() === 55 /* QuestionToken */ ||
+                    token() === 56 /* ColonToken */ ||
+                    token() === 26 /* CommaToken */ ||
                     canParseSemicolon();
             }
             return false;
         }
         function parseTypeMember() {
-            if (token() === 19 || token() === 27) {
-                return parseSignatureMember(158);
+            if (token() === 19 /* OpenParenToken */ || token() === 27 /* LessThanToken */) {
+                return parseSignatureMember(158 /* CallSignature */);
             }
-            if (token() === 94 && lookAhead(nextTokenIsOpenParenOrLessThan)) {
-                return parseSignatureMember(159);
+            if (token() === 94 /* NewKeyword */ && lookAhead(nextTokenIsOpenParenOrLessThan)) {
+                return parseSignatureMember(159 /* ConstructSignature */);
             }
-            var node = createNodeWithJSDoc(0);
+            var node = createNodeWithJSDoc(0 /* Unknown */);
             node.modifiers = parseModifiers();
             if (isIndexSignature()) {
                 return parseIndexSignatureDeclaration(node);
@@ -13716,30 +17346,30 @@ var ts;
         }
         function nextTokenIsOpenParenOrLessThan() {
             nextToken();
-            return token() === 19 || token() === 27;
+            return token() === 19 /* OpenParenToken */ || token() === 27 /* LessThanToken */;
         }
         function nextTokenIsDot() {
-            return nextToken() === 23;
+            return nextToken() === 23 /* DotToken */;
         }
         function nextTokenIsOpenParenOrLessThanOrDot() {
             switch (nextToken()) {
-                case 19:
-                case 27:
-                case 23:
+                case 19 /* OpenParenToken */:
+                case 27 /* LessThanToken */:
+                case 23 /* DotToken */:
                     return true;
             }
             return false;
         }
         function parseTypeLiteral() {
-            var node = createNode(166);
+            var node = createNode(166 /* TypeLiteral */);
             node.members = parseObjectTypeMembers();
             return finishNode(node);
         }
         function parseObjectTypeMembers() {
             var members;
-            if (parseExpected(17)) {
-                members = parseList(4, parseTypeMember);
-                parseExpected(18);
+            if (parseExpected(17 /* OpenBraceToken */)) {
+                members = parseList(4 /* TypeMembers */, parseTypeMember);
+                parseExpected(18 /* CloseBraceToken */);
             }
             else {
                 members = createMissingList();
@@ -13748,85 +17378,76 @@ var ts;
         }
         function isStartOfMappedType() {
             nextToken();
-            if (token() === 37 || token() === 38) {
-                return nextToken() === 132;
+            if (token() === 37 /* PlusToken */ || token() === 38 /* MinusToken */) {
+                return nextToken() === 132 /* ReadonlyKeyword */;
             }
-            if (token() === 132) {
+            if (token() === 132 /* ReadonlyKeyword */) {
                 nextToken();
             }
-            return token() === 21 && nextTokenIsIdentifier() && nextToken() === 92;
+            return token() === 21 /* OpenBracketToken */ && nextTokenIsIdentifier() && nextToken() === 92 /* InKeyword */;
         }
         function parseMappedTypeParameter() {
-            var node = createNode(148);
+            var node = createNode(148 /* TypeParameter */);
             node.name = parseIdentifier();
-            parseExpected(92);
+            parseExpected(92 /* InKeyword */);
             node.constraint = parseType();
             return finishNode(node);
         }
         function parseMappedType() {
-            var node = createNode(177);
-            parseExpected(17);
-            if (token() === 132 || token() === 37 || token() === 38) {
+            var node = createNode(177 /* MappedType */);
+            parseExpected(17 /* OpenBraceToken */);
+            if (token() === 132 /* ReadonlyKeyword */ || token() === 37 /* PlusToken */ || token() === 38 /* MinusToken */) {
                 node.readonlyToken = parseTokenNode();
-                if (node.readonlyToken.kind !== 132) {
-                    parseExpectedToken(132);
+                if (node.readonlyToken.kind !== 132 /* ReadonlyKeyword */) {
+                    parseExpectedToken(132 /* ReadonlyKeyword */);
                 }
             }
-            parseExpected(21);
+            parseExpected(21 /* OpenBracketToken */);
             node.typeParameter = parseMappedTypeParameter();
-            parseExpected(22);
-            if (token() === 55 || token() === 37 || token() === 38) {
+            parseExpected(22 /* CloseBracketToken */);
+            if (token() === 55 /* QuestionToken */ || token() === 37 /* PlusToken */ || token() === 38 /* MinusToken */) {
                 node.questionToken = parseTokenNode();
-                if (node.questionToken.kind !== 55) {
-                    parseExpectedToken(55);
+                if (node.questionToken.kind !== 55 /* QuestionToken */) {
+                    parseExpectedToken(55 /* QuestionToken */);
                 }
             }
             node.type = parseTypeAnnotation();
             parseSemicolon();
-            parseExpected(18);
+            parseExpected(18 /* CloseBraceToken */);
             return finishNode(node);
         }
         function parseTupleType() {
-            var node = createNode(168);
-            node.elementTypes = parseBracketedList(20, parseType, 21, 22);
+            var node = createNode(168 /* TupleType */);
+            node.elementTypes = parseBracketedList(20 /* TupleElementTypes */, parseType, 21 /* OpenBracketToken */, 22 /* CloseBracketToken */);
             return finishNode(node);
         }
         function parseParenthesizedType() {
-            var node = createNode(173);
-            parseExpected(19);
+            var node = createNode(173 /* ParenthesizedType */);
+            parseExpected(19 /* OpenParenToken */);
             node.type = parseType();
-            if (!node.type) {
-                return undefined;
-            }
-            parseExpected(20);
+            parseExpected(20 /* CloseParenToken */);
             return finishNode(node);
         }
-        function parseFunctionOrConstructorType(kind) {
-            var node = createNodeWithJSDoc(kind);
-            if (kind === 164) {
-                parseExpected(94);
-            }
-            if (!fillSignature(36, 4 | (sourceFile.languageVariant === 1 ? 8 : 0), node)) {
-                return undefined;
-            }
-            if (!node.parameters) {
-                return undefined;
-            }
+        function parseFunctionOrConstructorType() {
+            var pos = getNodePos();
+            var kind = parseOptional(94 /* NewKeyword */) ? 164 /* ConstructorType */ : 163 /* FunctionType */;
+            var node = createNodeWithJSDoc(kind, pos);
+            fillSignature(36 /* EqualsGreaterThanToken */, 4 /* Type */, node);
             return finishNode(node);
         }
         function parseKeywordAndNoDot() {
             var node = parseTokenNode();
-            return token() === 23 ? undefined : node;
+            return token() === 23 /* DotToken */ ? undefined : node;
         }
         function parseLiteralTypeNode(negative) {
-            var node = createNode(178);
+            var node = createNode(178 /* LiteralType */);
             var unaryMinusExpression;
             if (negative) {
-                unaryMinusExpression = createNode(198);
-                unaryMinusExpression.operator = 38;
+                unaryMinusExpression = createNode(198 /* PrefixUnaryExpression */);
+                unaryMinusExpression.operator = 38 /* MinusToken */;
                 nextToken();
             }
-            var expression = token() === 101 || token() === 86
+            var expression = token() === 101 /* TrueKeyword */ || token() === 86 /* FalseKeyword */
                 ? parseTokenNode()
                 : parseLiteralLikeNode(token());
             if (negative) {
@@ -13839,78 +17460,79 @@ var ts;
         }
         function isStartOfTypeOfImportType() {
             nextToken();
-            return token() === 91;
+            return token() === 91 /* ImportKeyword */;
         }
         function parseImportType() {
-            sourceFile.flags |= 524288;
-            var node = createNode(179);
-            if (parseOptional(103)) {
+            sourceFile.flags |= 524288 /* PossiblyContainsDynamicImport */;
+            var node = createNode(179 /* ImportType */);
+            if (parseOptional(103 /* TypeOfKeyword */)) {
                 node.isTypeOf = true;
             }
-            parseExpected(91);
-            parseExpected(19);
+            parseExpected(91 /* ImportKeyword */);
+            parseExpected(19 /* OpenParenToken */);
             node.argument = parseType();
-            parseExpected(20);
-            if (parseOptional(23)) {
-                node.qualifier = parseEntityName(true, ts.Diagnostics.Type_expected);
+            parseExpected(20 /* CloseParenToken */);
+            if (parseOptional(23 /* DotToken */)) {
+                node.qualifier = parseEntityName(/*allowReservedWords*/ true, ts.Diagnostics.Type_expected);
             }
             node.typeArguments = tryParseTypeArguments();
             return finishNode(node);
         }
         function nextTokenIsNumericLiteral() {
-            return nextToken() === 8;
+            return nextToken() === 8 /* NumericLiteral */;
         }
         function parseNonArrayType() {
             switch (token()) {
-                case 119:
-                case 142:
-                case 137:
-                case 134:
-                case 138:
-                case 122:
-                case 140:
-                case 131:
-                case 135:
+                case 119 /* AnyKeyword */:
+                case 142 /* UnknownKeyword */:
+                case 137 /* StringKeyword */:
+                case 134 /* NumberKeyword */:
+                case 138 /* SymbolKeyword */:
+                case 122 /* BooleanKeyword */:
+                case 140 /* UndefinedKeyword */:
+                case 131 /* NeverKeyword */:
+                case 135 /* ObjectKeyword */:
+                    // If these are followed by a dot, then parse these out as a dotted type reference instead.
                     return tryParse(parseKeywordAndNoDot) || parseTypeReference();
-                case 39:
-                    return parseJSDocAllType(false);
-                case 61:
-                    return parseJSDocAllType(true);
-                case 55:
+                case 39 /* AsteriskToken */:
+                    return parseJSDocAllType(/*postfixEquals*/ false);
+                case 61 /* AsteriskEqualsToken */:
+                    return parseJSDocAllType(/*postfixEquals*/ true);
+                case 55 /* QuestionToken */:
                     return parseJSDocUnknownOrNullableType();
-                case 89:
+                case 89 /* FunctionKeyword */:
                     return parseJSDocFunctionType();
-                case 51:
+                case 51 /* ExclamationToken */:
                     return parseJSDocNonNullableType();
-                case 13:
-                case 9:
-                case 8:
-                case 101:
-                case 86:
+                case 13 /* NoSubstitutionTemplateLiteral */:
+                case 9 /* StringLiteral */:
+                case 8 /* NumericLiteral */:
+                case 101 /* TrueKeyword */:
+                case 86 /* FalseKeyword */:
                     return parseLiteralTypeNode();
-                case 38:
-                    return lookAhead(nextTokenIsNumericLiteral) ? parseLiteralTypeNode(true) : parseTypeReference();
-                case 105:
-                case 95:
+                case 38 /* MinusToken */:
+                    return lookAhead(nextTokenIsNumericLiteral) ? parseLiteralTypeNode(/*negative*/ true) : parseTypeReference();
+                case 105 /* VoidKeyword */:
+                case 95 /* NullKeyword */:
                     return parseTokenNode();
-                case 99: {
+                case 99 /* ThisKeyword */: {
                     var thisKeyword = parseThisTypeNode();
-                    if (token() === 127 && !scanner.hasPrecedingLineBreak()) {
+                    if (token() === 127 /* IsKeyword */ && !scanner.hasPrecedingLineBreak()) {
                         return parseThisTypePredicate(thisKeyword);
                     }
                     else {
                         return thisKeyword;
                     }
                 }
-                case 103:
+                case 103 /* TypeOfKeyword */:
                     return lookAhead(isStartOfTypeOfImportType) ? parseImportType() : parseTypeQuery();
-                case 17:
+                case 17 /* OpenBraceToken */:
                     return lookAhead(isStartOfMappedType) ? parseMappedType() : parseTypeLiteral();
-                case 21:
+                case 21 /* OpenBracketToken */:
                     return parseTupleType();
-                case 19:
+                case 19 /* OpenParenToken */:
                     return parseParenthesizedType();
-                case 91:
+                case 91 /* ImportKeyword */:
                     return parseImportType();
                 default:
                     return parseTypeReference();
@@ -13918,40 +17540,42 @@ var ts;
         }
         function isStartOfType(inStartOfParameter) {
             switch (token()) {
-                case 119:
-                case 142:
-                case 137:
-                case 134:
-                case 122:
-                case 138:
-                case 141:
-                case 105:
-                case 140:
-                case 95:
-                case 99:
-                case 103:
-                case 131:
-                case 17:
-                case 21:
-                case 27:
-                case 49:
-                case 48:
-                case 94:
-                case 9:
-                case 8:
-                case 101:
-                case 86:
-                case 135:
-                case 39:
-                case 55:
-                case 51:
-                case 24:
-                case 126:
-                case 91:
+                case 119 /* AnyKeyword */:
+                case 142 /* UnknownKeyword */:
+                case 137 /* StringKeyword */:
+                case 134 /* NumberKeyword */:
+                case 122 /* BooleanKeyword */:
+                case 138 /* SymbolKeyword */:
+                case 141 /* UniqueKeyword */:
+                case 105 /* VoidKeyword */:
+                case 140 /* UndefinedKeyword */:
+                case 95 /* NullKeyword */:
+                case 99 /* ThisKeyword */:
+                case 103 /* TypeOfKeyword */:
+                case 131 /* NeverKeyword */:
+                case 17 /* OpenBraceToken */:
+                case 21 /* OpenBracketToken */:
+                case 27 /* LessThanToken */:
+                case 49 /* BarToken */:
+                case 48 /* AmpersandToken */:
+                case 94 /* NewKeyword */:
+                case 9 /* StringLiteral */:
+                case 8 /* NumericLiteral */:
+                case 101 /* TrueKeyword */:
+                case 86 /* FalseKeyword */:
+                case 135 /* ObjectKeyword */:
+                case 39 /* AsteriskToken */:
+                case 55 /* QuestionToken */:
+                case 51 /* ExclamationToken */:
+                case 24 /* DotDotDotToken */:
+                case 126 /* InferKeyword */:
+                case 91 /* ImportKeyword */:
                     return true;
-                case 38:
+                case 38 /* MinusToken */:
                     return !inStartOfParameter && lookAhead(nextTokenIsNumericLiteral);
-                case 19:
+                case 19 /* OpenParenToken */:
+                    // Only consider '(' the start of a type if followed by ')', '...', an identifier, a modifier,
+                    // or something that starts a type. We don't want to consider things like '(1)' a type.
                     return !inStartOfParameter && lookAhead(isStartOfParenthesizedOrFunctionType);
                 default:
                     return isIdentifier();
@@ -13959,34 +17583,35 @@ var ts;
         }
         function isStartOfParenthesizedOrFunctionType() {
             nextToken();
-            return token() === 20 || isStartOfParameter() || isStartOfType();
+            return token() === 20 /* CloseParenToken */ || isStartOfParameter() || isStartOfType();
         }
         function parsePostfixTypeOrHigher() {
             var type = parseNonArrayType();
             while (!scanner.hasPrecedingLineBreak()) {
                 switch (token()) {
-                    case 51:
-                        type = createJSDocPostfixType(282, type);
+                    case 51 /* ExclamationToken */:
+                        type = createJSDocPostfixType(282 /* JSDocNonNullableType */, type);
                         break;
-                    case 55:
-                        if (!(contextFlags & 2097152) && lookAhead(nextTokenIsStartOfType)) {
+                    case 55 /* QuestionToken */:
+                        // If not in JSDoc and next token is start of a type we have a conditional type
+                        if (!(contextFlags & 2097152 /* JSDoc */) && lookAhead(nextTokenIsStartOfType)) {
                             return type;
                         }
-                        type = createJSDocPostfixType(281, type);
+                        type = createJSDocPostfixType(281 /* JSDocNullableType */, type);
                         break;
-                    case 21:
-                        parseExpected(21);
+                    case 21 /* OpenBracketToken */:
+                        parseExpected(21 /* OpenBracketToken */);
                         if (isStartOfType()) {
-                            var node = createNode(176, type.pos);
+                            var node = createNode(176 /* IndexedAccessType */, type.pos);
                             node.objectType = type;
                             node.indexType = parseType();
-                            parseExpected(22);
+                            parseExpected(22 /* CloseBracketToken */);
                             type = finishNode(node);
                         }
                         else {
-                            var node = createNode(167, type.pos);
+                            var node = createNode(167 /* ArrayType */, type.pos);
                             node.elementType = type;
-                            parseExpected(22);
+                            parseExpected(22 /* CloseBracketToken */);
                             type = finishNode(node);
                         }
                         break;
@@ -14003,16 +17628,16 @@ var ts;
             return finishNode(postfix);
         }
         function parseTypeOperator(operator) {
-            var node = createNode(175);
+            var node = createNode(175 /* TypeOperator */);
             parseExpected(operator);
             node.operator = operator;
             node.type = parseTypeOperatorOrHigher();
             return finishNode(node);
         }
         function parseInferType() {
-            var node = createNode(172);
-            parseExpected(126);
-            var typeParameter = createNode(148);
+            var node = createNode(172 /* InferType */);
+            parseExpected(126 /* InferKeyword */);
+            var typeParameter = createNode(148 /* TypeParameter */);
             typeParameter.name = parseIdentifier();
             node.typeParameter = finishNode(typeParameter);
             return finishNode(node);
@@ -14020,10 +17645,10 @@ var ts;
         function parseTypeOperatorOrHigher() {
             var operator = token();
             switch (operator) {
-                case 128:
-                case 141:
+                case 128 /* KeyOfKeyword */:
+                case 141 /* UniqueKeyword */:
                     return parseTypeOperator(operator);
-                case 126:
+                case 126 /* InferKeyword */:
                     return parseInferType();
             }
             return parsePostfixTypeOrHigher();
@@ -14043,26 +17668,28 @@ var ts;
             return type;
         }
         function parseIntersectionTypeOrHigher() {
-            return parseUnionOrIntersectionType(170, parseTypeOperatorOrHigher, 48);
+            return parseUnionOrIntersectionType(170 /* IntersectionType */, parseTypeOperatorOrHigher, 48 /* AmpersandToken */);
         }
         function parseUnionTypeOrHigher() {
-            return parseUnionOrIntersectionType(169, parseIntersectionTypeOrHigher, 49);
+            return parseUnionOrIntersectionType(169 /* UnionType */, parseIntersectionTypeOrHigher, 49 /* BarToken */);
         }
         function isStartOfFunctionType() {
-            if (token() === 27) {
+            if (token() === 27 /* LessThanToken */) {
                 return true;
             }
-            return token() === 19 && lookAhead(isUnambiguouslyStartOfFunctionType);
+            return token() === 19 /* OpenParenToken */ && lookAhead(isUnambiguouslyStartOfFunctionType);
         }
         function skipParameterStart() {
             if (ts.isModifierKind(token())) {
+                // Skip modifiers
                 parseModifiers();
             }
-            if (isIdentifier() || token() === 99) {
+            if (isIdentifier() || token() === 99 /* ThisKeyword */) {
                 nextToken();
                 return true;
             }
-            if (token() === 21 || token() === 17) {
+            if (token() === 21 /* OpenBracketToken */ || token() === 17 /* OpenBraceToken */) {
+                // Return true if we can parse an array or object binding pattern with no errors
                 var previousErrorCount = parseDiagnostics.length;
                 parseIdentifierOrPattern();
                 return previousErrorCount === parseDiagnostics.length;
@@ -14071,17 +17698,26 @@ var ts;
         }
         function isUnambiguouslyStartOfFunctionType() {
             nextToken();
-            if (token() === 20 || token() === 24) {
+            if (token() === 20 /* CloseParenToken */ || token() === 24 /* DotDotDotToken */) {
+                // ( )
+                // ( ...
                 return true;
             }
             if (skipParameterStart()) {
-                if (token() === 56 || token() === 26 ||
-                    token() === 55 || token() === 58) {
+                // We successfully skipped modifiers (if any) and an identifier or binding pattern,
+                // now see if we have something that indicates a parameter declaration
+                if (token() === 56 /* ColonToken */ || token() === 26 /* CommaToken */ ||
+                    token() === 55 /* QuestionToken */ || token() === 58 /* EqualsToken */) {
+                    // ( xxx :
+                    // ( xxx ,
+                    // ( xxx ?
+                    // ( xxx =
                     return true;
                 }
-                if (token() === 20) {
+                if (token() === 20 /* CloseParenToken */) {
                     nextToken();
-                    if (token() === 36) {
+                    if (token() === 36 /* EqualsGreaterThanToken */) {
+                        // ( xxx ) =>
                         return true;
                     }
                 }
@@ -14092,7 +17728,7 @@ var ts;
             var typePredicateVariable = isIdentifier() && tryParse(parseTypePredicatePrefix);
             var type = parseType();
             if (typePredicateVariable) {
-                var node = createNode(161, typePredicateVariable.pos);
+                var node = createNode(161 /* TypePredicate */, typePredicateVariable.pos);
                 node.parameterName = typePredicateVariable;
                 node.type = type;
                 return finishNode(node);
@@ -14103,59 +17739,60 @@ var ts;
         }
         function parseTypePredicatePrefix() {
             var id = parseIdentifier();
-            if (token() === 127 && !scanner.hasPrecedingLineBreak()) {
+            if (token() === 127 /* IsKeyword */ && !scanner.hasPrecedingLineBreak()) {
                 nextToken();
                 return id;
             }
         }
         function parseType() {
-            return doOutsideOfContext(20480, parseTypeWorker);
+            // The rules about 'yield' only apply to actual code/expression contexts.  They don't
+            // apply to 'type' contexts.  So we disable these parameters here before moving on.
+            return doOutsideOfContext(20480 /* TypeExcludesFlags */, parseTypeWorker);
         }
         function parseTypeWorker(noConditionalTypes) {
-            if (isStartOfFunctionType()) {
-                return parseFunctionOrConstructorType(163);
-            }
-            if (token() === 94) {
-                return parseFunctionOrConstructorType(164);
+            if (isStartOfFunctionType() || token() === 94 /* NewKeyword */) {
+                return parseFunctionOrConstructorType();
             }
             var type = parseUnionTypeOrHigher();
-            if (!noConditionalTypes && !scanner.hasPrecedingLineBreak() && parseOptional(85)) {
-                var node = createNode(171, type.pos);
+            if (!noConditionalTypes && !scanner.hasPrecedingLineBreak() && parseOptional(85 /* ExtendsKeyword */)) {
+                var node = createNode(171 /* ConditionalType */, type.pos);
                 node.checkType = type;
-                node.extendsType = parseTypeWorker(true);
-                parseExpected(55);
+                // The type following 'extends' is not permitted to be another conditional type
+                node.extendsType = parseTypeWorker(/*noConditionalTypes*/ true);
+                parseExpected(55 /* QuestionToken */);
                 node.trueType = parseTypeWorker();
-                parseExpected(56);
+                parseExpected(56 /* ColonToken */);
                 node.falseType = parseTypeWorker();
                 return finishNode(node);
             }
             return type;
         }
         function parseTypeAnnotation() {
-            return parseOptional(56) ? parseType() : undefined;
+            return parseOptional(56 /* ColonToken */) ? parseType() : undefined;
         }
+        // EXPRESSIONS
         function isStartOfLeftHandSideExpression() {
             switch (token()) {
-                case 99:
-                case 97:
-                case 95:
-                case 101:
-                case 86:
-                case 8:
-                case 9:
-                case 13:
-                case 14:
-                case 19:
-                case 21:
-                case 17:
-                case 89:
-                case 75:
-                case 94:
-                case 41:
-                case 63:
-                case 71:
+                case 99 /* ThisKeyword */:
+                case 97 /* SuperKeyword */:
+                case 95 /* NullKeyword */:
+                case 101 /* TrueKeyword */:
+                case 86 /* FalseKeyword */:
+                case 8 /* NumericLiteral */:
+                case 9 /* StringLiteral */:
+                case 13 /* NoSubstitutionTemplateLiteral */:
+                case 14 /* TemplateHead */:
+                case 19 /* OpenParenToken */:
+                case 21 /* OpenBracketToken */:
+                case 17 /* OpenBraceToken */:
+                case 89 /* FunctionKeyword */:
+                case 75 /* ClassKeyword */:
+                case 94 /* NewKeyword */:
+                case 41 /* SlashToken */:
+                case 63 /* SlashEqualsToken */:
+                case 71 /* Identifier */:
                     return true;
-                case 91:
+                case 91 /* ImportKeyword */:
                     return lookAhead(nextTokenIsOpenParenOrLessThanOrDot);
                 default:
                     return isIdentifier();
@@ -14166,20 +17803,27 @@ var ts;
                 return true;
             }
             switch (token()) {
-                case 37:
-                case 38:
-                case 52:
-                case 51:
-                case 80:
-                case 103:
-                case 105:
-                case 43:
-                case 44:
-                case 27:
-                case 121:
-                case 116:
+                case 37 /* PlusToken */:
+                case 38 /* MinusToken */:
+                case 52 /* TildeToken */:
+                case 51 /* ExclamationToken */:
+                case 80 /* DeleteKeyword */:
+                case 103 /* TypeOfKeyword */:
+                case 105 /* VoidKeyword */:
+                case 43 /* PlusPlusToken */:
+                case 44 /* MinusMinusToken */:
+                case 27 /* LessThanToken */:
+                case 121 /* AwaitKeyword */:
+                case 116 /* YieldKeyword */:
+                    // Yield/await always starts an expression.  Either it is an identifier (in which case
+                    // it is definitely an expression).  Or it's a keyword (either because we're in
+                    // a generator or async function, or in strict mode (or both)) and it started a yield or await expression.
                     return true;
                 default:
+                    // Error tolerance.  If we see the start of some binary operator, we consider
+                    // that the start of an expression.  That way we'll parse out a missing identifier,
+                    // give a good message about an identifier being missing, and then consume the
+                    // rest of the binary expression.
                     if (isBinaryOperator()) {
                         return true;
                     }
@@ -14187,52 +17831,114 @@ var ts;
             }
         }
         function isStartOfExpressionStatement() {
-            return token() !== 17 &&
-                token() !== 89 &&
-                token() !== 75 &&
-                token() !== 57 &&
+            // As per the grammar, none of '{' or 'function' or 'class' can start an expression statement.
+            return token() !== 17 /* OpenBraceToken */ &&
+                token() !== 89 /* FunctionKeyword */ &&
+                token() !== 75 /* ClassKeyword */ &&
+                token() !== 57 /* AtToken */ &&
                 isStartOfExpression();
         }
         function parseExpression() {
+            // Expression[in]:
+            //      AssignmentExpression[in]
+            //      Expression[in] , AssignmentExpression[in]
+            // clear the decorator context when parsing Expression, as it should be unambiguous when parsing a decorator
             var saveDecoratorContext = inDecoratorContext();
             if (saveDecoratorContext) {
-                setDecoratorContext(false);
+                setDecoratorContext(/*val*/ false);
             }
             var expr = parseAssignmentExpressionOrHigher();
             var operatorToken;
-            while ((operatorToken = parseOptionalToken(26))) {
+            while ((operatorToken = parseOptionalToken(26 /* CommaToken */))) {
                 expr = makeBinaryExpression(expr, operatorToken, parseAssignmentExpressionOrHigher());
             }
             if (saveDecoratorContext) {
-                setDecoratorContext(true);
+                setDecoratorContext(/*val*/ true);
             }
             return expr;
         }
         function parseInitializer() {
-            return parseOptional(58) ? parseAssignmentExpressionOrHigher() : undefined;
+            return parseOptional(58 /* EqualsToken */) ? parseAssignmentExpressionOrHigher() : undefined;
         }
         function parseAssignmentExpressionOrHigher() {
+            //  AssignmentExpression[in,yield]:
+            //      1) ConditionalExpression[?in,?yield]
+            //      2) LeftHandSideExpression = AssignmentExpression[?in,?yield]
+            //      3) LeftHandSideExpression AssignmentOperator AssignmentExpression[?in,?yield]
+            //      4) ArrowFunctionExpression[?in,?yield]
+            //      5) AsyncArrowFunctionExpression[in,yield,await]
+            //      6) [+Yield] YieldExpression[?In]
+            //
+            // Note: for ease of implementation we treat productions '2' and '3' as the same thing.
+            // (i.e. they're both BinaryExpressions with an assignment operator in it).
+            // First, do the simple check if we have a YieldExpression (production '6').
             if (isYieldExpression()) {
                 return parseYieldExpression();
             }
+            // Then, check if we have an arrow function (production '4' and '5') that starts with a parenthesized
+            // parameter list or is an async arrow function.
+            // AsyncArrowFunctionExpression:
+            //      1) async[no LineTerminator here]AsyncArrowBindingIdentifier[?Yield][no LineTerminator here]=>AsyncConciseBody[?In]
+            //      2) CoverCallExpressionAndAsyncArrowHead[?Yield, ?Await][no LineTerminator here]=>AsyncConciseBody[?In]
+            // Production (1) of AsyncArrowFunctionExpression is parsed in "tryParseAsyncSimpleArrowFunctionExpression".
+            // And production (2) is parsed in "tryParseParenthesizedArrowFunctionExpression".
+            //
+            // If we do successfully parse arrow-function, we must *not* recurse for productions 1, 2 or 3. An ArrowFunction is
+            // not a LeftHandSideExpression, nor does it start a ConditionalExpression.  So we are done
+            // with AssignmentExpression if we see one.
             var arrowExpression = tryParseParenthesizedArrowFunctionExpression() || tryParseAsyncSimpleArrowFunctionExpression();
             if (arrowExpression) {
                 return arrowExpression;
             }
-            var expr = parseBinaryExpressionOrHigher(0);
-            if (expr.kind === 71 && token() === 36) {
+            // Now try to see if we're in production '1', '2' or '3'.  A conditional expression can
+            // start with a LogicalOrExpression, while the assignment productions can only start with
+            // LeftHandSideExpressions.
+            //
+            // So, first, we try to just parse out a BinaryExpression.  If we get something that is a
+            // LeftHandSide or higher, then we can try to parse out the assignment expression part.
+            // Otherwise, we try to parse out the conditional expression bit.  We want to allow any
+            // binary expression here, so we pass in the 'lowest' precedence here so that it matches
+            // and consumes anything.
+            var expr = parseBinaryExpressionOrHigher(/*precedence*/ 0);
+            // To avoid a look-ahead, we did not handle the case of an arrow function with a single un-parenthesized
+            // parameter ('x => ...') above. We handle it here by checking if the parsed expression was a single
+            // identifier and the current token is an arrow.
+            if (expr.kind === 71 /* Identifier */ && token() === 36 /* EqualsGreaterThanToken */) {
                 return parseSimpleArrowFunctionExpression(expr);
             }
+            // Now see if we might be in cases '2' or '3'.
+            // If the expression was a LHS expression, and we have an assignment operator, then
+            // we're in '2' or '3'. Consume the assignment and return.
+            //
+            // Note: we call reScanGreaterToken so that we get an appropriately merged token
+            // for cases like `> > =` becoming `>>=`
             if (ts.isLeftHandSideExpression(expr) && ts.isAssignmentOperator(reScanGreaterToken())) {
                 return makeBinaryExpression(expr, parseTokenNode(), parseAssignmentExpressionOrHigher());
             }
+            // It wasn't an assignment or a lambda.  This is a conditional expression:
             return parseConditionalExpressionRest(expr);
         }
         function isYieldExpression() {
-            if (token() === 116) {
+            if (token() === 116 /* YieldKeyword */) {
+                // If we have a 'yield' keyword, and this is a context where yield expressions are
+                // allowed, then definitely parse out a yield expression.
                 if (inYieldContext()) {
                     return true;
                 }
+                // We're in a context where 'yield expr' is not allowed.  However, if we can
+                // definitely tell that the user was trying to parse a 'yield expr' and not
+                // just a normal expr that start with a 'yield' identifier, then parse out
+                // a 'yield expr'.  We can then report an error later that they are only
+                // allowed in generator expressions.
+                //
+                // for example, if we see 'yield(foo)', then we'll have to treat that as an
+                // invocation expression of something called 'yield'.  However, if we have
+                // 'yield foo' then that is not legal as a normal expression, so we can
+                // definitely recognize this as a yield expression.
+                //
+                // for now we just check if the next token is an identifier.  More heuristics
+                // can be added here later as necessary.  We just need to make sure that we
+                // don't accidentally consume something legal.
                 return lookAhead(nextTokenIsIdentifierOrKeywordOrLiteralOnSameLine);
             }
             return false;
@@ -14242,216 +17948,302 @@ var ts;
             return !scanner.hasPrecedingLineBreak() && isIdentifier();
         }
         function parseYieldExpression() {
-            var node = createNode(203);
+            var node = createNode(203 /* YieldExpression */);
+            // YieldExpression[In] :
+            //      yield
+            //      yield [no LineTerminator here] [Lexical goal InputElementRegExp]AssignmentExpression[?In, Yield]
+            //      yield [no LineTerminator here] * [Lexical goal InputElementRegExp]AssignmentExpression[?In, Yield]
             nextToken();
             if (!scanner.hasPrecedingLineBreak() &&
-                (token() === 39 || isStartOfExpression())) {
-                node.asteriskToken = parseOptionalToken(39);
+                (token() === 39 /* AsteriskToken */ || isStartOfExpression())) {
+                node.asteriskToken = parseOptionalToken(39 /* AsteriskToken */);
                 node.expression = parseAssignmentExpressionOrHigher();
                 return finishNode(node);
             }
             else {
+                // if the next token is not on the same line as yield.  or we don't have an '*' or
+                // the start of an expression, then this is just a simple "yield" expression.
                 return finishNode(node);
             }
         }
         function parseSimpleArrowFunctionExpression(identifier, asyncModifier) {
-            ts.Debug.assert(token() === 36, "parseSimpleArrowFunctionExpression should only have been called if we had a =>");
+            ts.Debug.assert(token() === 36 /* EqualsGreaterThanToken */, "parseSimpleArrowFunctionExpression should only have been called if we had a =>");
             var node;
             if (asyncModifier) {
-                node = createNode(193, asyncModifier.pos);
+                node = createNode(193 /* ArrowFunction */, asyncModifier.pos);
                 node.modifiers = asyncModifier;
             }
             else {
-                node = createNode(193, identifier.pos);
+                node = createNode(193 /* ArrowFunction */, identifier.pos);
             }
-            var parameter = createNode(149, identifier.pos);
+            var parameter = createNode(149 /* Parameter */, identifier.pos);
             parameter.name = identifier;
             finishNode(parameter);
             node.parameters = createNodeArray([parameter], parameter.pos, parameter.end);
-            node.equalsGreaterThanToken = parseExpectedToken(36);
-            node.body = parseArrowFunctionExpressionBody(!!asyncModifier);
+            node.equalsGreaterThanToken = parseExpectedToken(36 /* EqualsGreaterThanToken */);
+            node.body = parseArrowFunctionExpressionBody(/*isAsync*/ !!asyncModifier);
             return addJSDocComment(finishNode(node));
         }
         function tryParseParenthesizedArrowFunctionExpression() {
             var triState = isParenthesizedArrowFunctionExpression();
-            if (triState === 0) {
+            if (triState === 0 /* False */) {
+                // It's definitely not a parenthesized arrow function expression.
                 return undefined;
             }
-            var arrowFunction = triState === 1
-                ? parseParenthesizedArrowFunctionExpressionHead(true)
+            // If we definitely have an arrow function, then we can just parse one, not requiring a
+            // following => or { token. Otherwise, we *might* have an arrow function.  Try to parse
+            // it out, but don't allow any ambiguity, and return 'undefined' if this could be an
+            // expression instead.
+            var arrowFunction = triState === 1 /* True */
+                ? parseParenthesizedArrowFunctionExpressionHead(/*allowAmbiguity*/ true)
                 : tryParse(parsePossibleParenthesizedArrowFunctionExpressionHead);
             if (!arrowFunction) {
+                // Didn't appear to actually be a parenthesized arrow function.  Just bail out.
                 return undefined;
             }
-            var isAsync = ts.hasModifier(arrowFunction, 256);
+            var isAsync = ts.hasModifier(arrowFunction, 256 /* Async */);
+            // If we have an arrow, then try to parse the body. Even if not, try to parse if we
+            // have an opening brace, just in case we're in an error state.
             var lastToken = token();
-            arrowFunction.equalsGreaterThanToken = parseExpectedToken(36);
-            arrowFunction.body = (lastToken === 36 || lastToken === 17)
+            arrowFunction.equalsGreaterThanToken = parseExpectedToken(36 /* EqualsGreaterThanToken */);
+            arrowFunction.body = (lastToken === 36 /* EqualsGreaterThanToken */ || lastToken === 17 /* OpenBraceToken */)
                 ? parseArrowFunctionExpressionBody(isAsync)
                 : parseIdentifier();
             return finishNode(arrowFunction);
         }
+        //  True        -> We definitely expect a parenthesized arrow function here.
+        //  False       -> There *cannot* be a parenthesized arrow function here.
+        //  Unknown     -> There *might* be a parenthesized arrow function here.
+        //                 Speculatively look ahead to be sure, and rollback if not.
         function isParenthesizedArrowFunctionExpression() {
-            if (token() === 19 || token() === 27 || token() === 120) {
+            if (token() === 19 /* OpenParenToken */ || token() === 27 /* LessThanToken */ || token() === 120 /* AsyncKeyword */) {
                 return lookAhead(isParenthesizedArrowFunctionExpressionWorker);
             }
-            if (token() === 36) {
-                return 1;
+            if (token() === 36 /* EqualsGreaterThanToken */) {
+                // ERROR RECOVERY TWEAK:
+                // If we see a standalone => try to parse it as an arrow function expression as that's
+                // likely what the user intended to write.
+                return 1 /* True */;
             }
-            return 0;
+            // Definitely not a parenthesized arrow function.
+            return 0 /* False */;
         }
         function isParenthesizedArrowFunctionExpressionWorker() {
-            if (token() === 120) {
+            if (token() === 120 /* AsyncKeyword */) {
                 nextToken();
                 if (scanner.hasPrecedingLineBreak()) {
-                    return 0;
+                    return 0 /* False */;
                 }
-                if (token() !== 19 && token() !== 27) {
-                    return 0;
+                if (token() !== 19 /* OpenParenToken */ && token() !== 27 /* LessThanToken */) {
+                    return 0 /* False */;
                 }
             }
             var first = token();
             var second = nextToken();
-            if (first === 19) {
-                if (second === 20) {
+            if (first === 19 /* OpenParenToken */) {
+                if (second === 20 /* CloseParenToken */) {
+                    // Simple cases: "() =>", "(): ", and "() {".
+                    // This is an arrow function with no parameters.
+                    // The last one is not actually an arrow function,
+                    // but this is probably what the user intended.
                     var third = nextToken();
                     switch (third) {
-                        case 36:
-                        case 56:
-                        case 17:
-                            return 1;
+                        case 36 /* EqualsGreaterThanToken */:
+                        case 56 /* ColonToken */:
+                        case 17 /* OpenBraceToken */:
+                            return 1 /* True */;
                         default:
-                            return 0;
+                            return 0 /* False */;
                     }
                 }
-                if (second === 21 || second === 17) {
-                    return 2;
+                // If encounter "([" or "({", this could be the start of a binding pattern.
+                // Examples:
+                //      ([ x ]) => { }
+                //      ({ x }) => { }
+                //      ([ x ])
+                //      ({ x })
+                if (second === 21 /* OpenBracketToken */ || second === 17 /* OpenBraceToken */) {
+                    return 2 /* Unknown */;
                 }
-                if (second === 24) {
-                    return 1;
+                // Simple case: "(..."
+                // This is an arrow function with a rest parameter.
+                if (second === 24 /* DotDotDotToken */) {
+                    return 1 /* True */;
                 }
-                if (ts.isModifierKind(second) && second !== 120 && lookAhead(nextTokenIsIdentifier)) {
-                    return 1;
+                // Check for "(xxx yyy", where xxx is a modifier and yyy is an identifier. This
+                // isn't actually allowed, but we want to treat it as a lambda so we can provide
+                // a good error message.
+                if (ts.isModifierKind(second) && second !== 120 /* AsyncKeyword */ && lookAhead(nextTokenIsIdentifier)) {
+                    return 1 /* True */;
                 }
+                // If we had "(" followed by something that's not an identifier,
+                // then this definitely doesn't look like a lambda.
                 if (!isIdentifier()) {
-                    return 0;
+                    return 0 /* False */;
                 }
                 switch (nextToken()) {
-                    case 56:
-                        return 1;
-                    case 55:
+                    case 56 /* ColonToken */:
+                        // If we have something like "(a:", then we must have a
+                        // type-annotated parameter in an arrow function expression.
+                        return 1 /* True */;
+                    case 55 /* QuestionToken */:
                         nextToken();
-                        if (token() === 56 || token() === 26 || token() === 58 || token() === 20) {
-                            return 1;
+                        // If we have "(a?:" or "(a?," or "(a?=" or "(a?)" then it is definitely a lambda.
+                        if (token() === 56 /* ColonToken */ || token() === 26 /* CommaToken */ || token() === 58 /* EqualsToken */ || token() === 20 /* CloseParenToken */) {
+                            return 1 /* True */;
                         }
-                        return 0;
-                    case 26:
-                    case 58:
-                    case 20:
-                        return 2;
+                        // Otherwise it is definitely not a lambda.
+                        return 0 /* False */;
+                    case 26 /* CommaToken */:
+                    case 58 /* EqualsToken */:
+                    case 20 /* CloseParenToken */:
+                        // If we have "(a," or "(a=" or "(a)" this *could* be an arrow function
+                        return 2 /* Unknown */;
                 }
-                return 0;
+                // It is definitely not an arrow function
+                return 0 /* False */;
             }
             else {
-                ts.Debug.assert(first === 27);
+                ts.Debug.assert(first === 27 /* LessThanToken */);
+                // If we have "<" not followed by an identifier,
+                // then this definitely is not an arrow function.
                 if (!isIdentifier()) {
-                    return 0;
+                    return 0 /* False */;
                 }
-                if (sourceFile.languageVariant === 1) {
+                // JSX overrides
+                if (sourceFile.languageVariant === 1 /* JSX */) {
                     var isArrowFunctionInJsx = lookAhead(function () {
                         var third = nextToken();
-                        if (third === 85) {
+                        if (third === 85 /* ExtendsKeyword */) {
                             var fourth = nextToken();
                             switch (fourth) {
-                                case 58:
-                                case 29:
+                                case 58 /* EqualsToken */:
+                                case 29 /* GreaterThanToken */:
                                     return false;
                                 default:
                                     return true;
                             }
                         }
-                        else if (third === 26) {
+                        else if (third === 26 /* CommaToken */) {
                             return true;
                         }
                         return false;
                     });
                     if (isArrowFunctionInJsx) {
-                        return 1;
+                        return 1 /* True */;
                     }
-                    return 0;
+                    return 0 /* False */;
                 }
-                return 2;
+                // This *could* be a parenthesized arrow function.
+                return 2 /* Unknown */;
             }
         }
         function parsePossibleParenthesizedArrowFunctionExpressionHead() {
-            return parseParenthesizedArrowFunctionExpressionHead(false);
+            return parseParenthesizedArrowFunctionExpressionHead(/*allowAmbiguity*/ false);
         }
         function tryParseAsyncSimpleArrowFunctionExpression() {
-            if (token() === 120) {
-                if (lookAhead(isUnParenthesizedAsyncArrowFunctionWorker) === 1) {
+            // We do a check here so that we won't be doing unnecessarily call to "lookAhead"
+            if (token() === 120 /* AsyncKeyword */) {
+                if (lookAhead(isUnParenthesizedAsyncArrowFunctionWorker) === 1 /* True */) {
                     var asyncModifier = parseModifiersForArrowFunction();
-                    var expr = parseBinaryExpressionOrHigher(0);
+                    var expr = parseBinaryExpressionOrHigher(/*precedence*/ 0);
                     return parseSimpleArrowFunctionExpression(expr, asyncModifier);
                 }
             }
             return undefined;
         }
         function isUnParenthesizedAsyncArrowFunctionWorker() {
-            if (token() === 120) {
+            // AsyncArrowFunctionExpression:
+            //      1) async[no LineTerminator here]AsyncArrowBindingIdentifier[?Yield][no LineTerminator here]=>AsyncConciseBody[?In]
+            //      2) CoverCallExpressionAndAsyncArrowHead[?Yield, ?Await][no LineTerminator here]=>AsyncConciseBody[?In]
+            if (token() === 120 /* AsyncKeyword */) {
                 nextToken();
-                if (scanner.hasPrecedingLineBreak() || token() === 36) {
-                    return 0;
+                // If the "async" is followed by "=>" token then it is not a beginning of an async arrow-function
+                // but instead a simple arrow-function which will be parsed inside "parseAssignmentExpressionOrHigher"
+                if (scanner.hasPrecedingLineBreak() || token() === 36 /* EqualsGreaterThanToken */) {
+                    return 0 /* False */;
                 }
-                var expr = parseBinaryExpressionOrHigher(0);
-                if (!scanner.hasPrecedingLineBreak() && expr.kind === 71 && token() === 36) {
-                    return 1;
+                // Check for un-parenthesized AsyncArrowFunction
+                var expr = parseBinaryExpressionOrHigher(/*precedence*/ 0);
+                if (!scanner.hasPrecedingLineBreak() && expr.kind === 71 /* Identifier */ && token() === 36 /* EqualsGreaterThanToken */) {
+                    return 1 /* True */;
                 }
             }
-            return 0;
+            return 0 /* False */;
         }
         function parseParenthesizedArrowFunctionExpressionHead(allowAmbiguity) {
-            var node = createNodeWithJSDoc(193);
+            var node = createNodeWithJSDoc(193 /* ArrowFunction */);
             node.modifiers = parseModifiersForArrowFunction();
-            var isAsync = ts.hasModifier(node, 256) ? 2 : 0;
-            if (!fillSignature(56, isAsync | (allowAmbiguity ? 0 : 8), node)) {
+            var isAsync = ts.hasModifier(node, 256 /* Async */) ? 2 /* Await */ : 0 /* None */;
+            // Arrow functions are never generators.
+            //
+            // If we're speculatively parsing a signature for a parenthesized arrow function, then
+            // we have to have a complete parameter list.  Otherwise we might see something like
+            // a => (b => c)
+            // And think that "(b =>" was actually a parenthesized arrow function with a missing
+            // close paren.
+            if (!fillSignature(56 /* ColonToken */, isAsync, node) && !allowAmbiguity) {
                 return undefined;
             }
-            if (!node.parameters) {
-                return undefined;
-            }
-            if (!allowAmbiguity && token() !== 36 && token() !== 17) {
+            // Parsing a signature isn't enough.
+            // Parenthesized arrow signatures often look like other valid expressions.
+            // For instance:
+            //  - "(x = 10)" is an assignment expression parsed as a signature with a default parameter value.
+            //  - "(x,y)" is a comma expression parsed as a signature with two parameters.
+            //  - "a ? (b): c" will have "(b):" parsed as a signature with a return type annotation.
+            //
+            // So we need just a bit of lookahead to ensure that it can only be a signature.
+            if (!allowAmbiguity && token() !== 36 /* EqualsGreaterThanToken */ && token() !== 17 /* OpenBraceToken */) {
+                // Returning undefined here will cause our caller to rewind to where we started from.
                 return undefined;
             }
             return node;
         }
         function parseArrowFunctionExpressionBody(isAsync) {
-            if (token() === 17) {
-                return parseFunctionBlock(isAsync ? 2 : 0);
+            if (token() === 17 /* OpenBraceToken */) {
+                return parseFunctionBlock(isAsync ? 2 /* Await */ : 0 /* None */);
             }
-            if (token() !== 25 &&
-                token() !== 89 &&
-                token() !== 75 &&
+            if (token() !== 25 /* SemicolonToken */ &&
+                token() !== 89 /* FunctionKeyword */ &&
+                token() !== 75 /* ClassKeyword */ &&
                 isStartOfStatement() &&
                 !isStartOfExpressionStatement()) {
-                return parseFunctionBlock(16 | (isAsync ? 2 : 0));
+                // Check if we got a plain statement (i.e. no expression-statements, no function/class expressions/declarations)
+                //
+                // Here we try to recover from a potential error situation in the case where the
+                // user meant to supply a block. For example, if the user wrote:
+                //
+                //  a =>
+                //      let v = 0;
+                //  }
+                //
+                // they may be missing an open brace.  Check to see if that's the case so we can
+                // try to recover better.  If we don't do this, then the next close curly we see may end
+                // up preemptively closing the containing construct.
+                //
+                // Note: even when 'IgnoreMissingOpenBrace' is passed, parseBody will still error.
+                return parseFunctionBlock(16 /* IgnoreMissingOpenBrace */ | (isAsync ? 2 /* Await */ : 0 /* None */));
             }
             return isAsync
                 ? doInAwaitContext(parseAssignmentExpressionOrHigher)
                 : doOutsideOfAwaitContext(parseAssignmentExpressionOrHigher);
         }
         function parseConditionalExpressionRest(leftOperand) {
-            var questionToken = parseOptionalToken(55);
+            // Note: we are passed in an expression which was produced from parseBinaryExpressionOrHigher.
+            var questionToken = parseOptionalToken(55 /* QuestionToken */);
             if (!questionToken) {
                 return leftOperand;
             }
-            var node = createNode(201, leftOperand.pos);
+            // Note: we explicitly 'allowIn' in the whenTrue part of the condition expression, and
+            // we do not that for the 'whenFalse' part.
+            var node = createNode(201 /* ConditionalExpression */, leftOperand.pos);
             node.condition = leftOperand;
             node.questionToken = questionToken;
             node.whenTrue = doOutsideOfContext(disallowInAndDecoratorContext, parseAssignmentExpressionOrHigher);
-            node.colonToken = parseExpectedToken(56);
+            node.colonToken = parseExpectedToken(56 /* ColonToken */);
             node.whenFalse = ts.nodeIsPresent(node.colonToken)
                 ? parseAssignmentExpressionOrHigher()
-                : createMissingNode(71, false, ts.Diagnostics._0_expected, ts.tokenToString(56));
+                : createMissingNode(71 /* Identifier */, /*reportAtCurrentPosition*/ false, ts.Diagnostics._0_expected, ts.tokenToString(56 /* ColonToken */));
             return finishNode(node);
         }
         function parseBinaryExpressionOrHigher(precedence) {
@@ -14459,22 +18251,50 @@ var ts;
             return parseBinaryExpressionRest(precedence, leftOperand);
         }
         function isInOrOfKeyword(t) {
-            return t === 92 || t === 145;
+            return t === 92 /* InKeyword */ || t === 145 /* OfKeyword */;
         }
         function parseBinaryExpressionRest(precedence, leftOperand) {
             while (true) {
+                // We either have a binary operator here, or we're finished.  We call
+                // reScanGreaterToken so that we merge token sequences like > and = into >=
                 reScanGreaterToken();
                 var newPrecedence = ts.getBinaryOperatorPrecedence(token());
-                var consumeCurrentOperator = token() === 40 ?
+                // Check the precedence to see if we should "take" this operator
+                // - For left associative operator (all operator but **), consume the operator,
+                //   recursively call the function below, and parse binaryExpression as a rightOperand
+                //   of the caller if the new precedence of the operator is greater then or equal to the current precedence.
+                //   For example:
+                //      a - b - c;
+                //            ^token; leftOperand = b. Return b to the caller as a rightOperand
+                //      a * b - c
+                //            ^token; leftOperand = b. Return b to the caller as a rightOperand
+                //      a - b * c;
+                //            ^token; leftOperand = b. Return b * c to the caller as a rightOperand
+                // - For right associative operator (**), consume the operator, recursively call the function
+                //   and parse binaryExpression as a rightOperand of the caller if the new precedence of
+                //   the operator is strictly grater than the current precedence
+                //   For example:
+                //      a ** b ** c;
+                //             ^^token; leftOperand = b. Return b ** c to the caller as a rightOperand
+                //      a - b ** c;
+                //            ^^token; leftOperand = b. Return b ** c to the caller as a rightOperand
+                //      a ** b - c
+                //             ^token; leftOperand = b. Return b to the caller as a rightOperand
+                var consumeCurrentOperator = token() === 40 /* AsteriskAsteriskToken */ ?
                     newPrecedence >= precedence :
                     newPrecedence > precedence;
                 if (!consumeCurrentOperator) {
                     break;
                 }
-                if (token() === 92 && inDisallowInContext()) {
+                if (token() === 92 /* InKeyword */ && inDisallowInContext()) {
                     break;
                 }
-                if (token() === 118) {
+                if (token() === 118 /* AsKeyword */) {
+                    // Make sure we *do* perform ASI for constructs like this:
+                    //    var x = foo
+                    //    as (Bar)
+                    // This should be parsed as an initialized variable, followed
+                    // by a function call to 'as' with the argument 'Bar'
                     if (scanner.hasPrecedingLineBreak()) {
                         break;
                     }
@@ -14490,77 +18310,105 @@ var ts;
             return leftOperand;
         }
         function isBinaryOperator() {
-            if (inDisallowInContext() && token() === 92) {
+            if (inDisallowInContext() && token() === 92 /* InKeyword */) {
                 return false;
             }
             return ts.getBinaryOperatorPrecedence(token()) > 0;
         }
         function makeBinaryExpression(left, operatorToken, right) {
-            var node = createNode(200, left.pos);
+            var node = createNode(200 /* BinaryExpression */, left.pos);
             node.left = left;
             node.operatorToken = operatorToken;
             node.right = right;
             return finishNode(node);
         }
         function makeAsExpression(left, right) {
-            var node = createNode(208, left.pos);
+            var node = createNode(208 /* AsExpression */, left.pos);
             node.expression = left;
             node.type = right;
             return finishNode(node);
         }
         function parsePrefixUnaryExpression() {
-            var node = createNode(198);
+            var node = createNode(198 /* PrefixUnaryExpression */);
             node.operator = token();
             nextToken();
             node.operand = parseSimpleUnaryExpression();
             return finishNode(node);
         }
         function parseDeleteExpression() {
-            var node = createNode(194);
+            var node = createNode(194 /* DeleteExpression */);
             nextToken();
             node.expression = parseSimpleUnaryExpression();
             return finishNode(node);
         }
         function parseTypeOfExpression() {
-            var node = createNode(195);
+            var node = createNode(195 /* TypeOfExpression */);
             nextToken();
             node.expression = parseSimpleUnaryExpression();
             return finishNode(node);
         }
         function parseVoidExpression() {
-            var node = createNode(196);
+            var node = createNode(196 /* VoidExpression */);
             nextToken();
             node.expression = parseSimpleUnaryExpression();
             return finishNode(node);
         }
         function isAwaitExpression() {
-            if (token() === 121) {
+            if (token() === 121 /* AwaitKeyword */) {
                 if (inAwaitContext()) {
                     return true;
                 }
+                // here we are using similar heuristics as 'isYieldExpression'
                 return lookAhead(nextTokenIsIdentifierOrKeywordOrLiteralOnSameLine);
             }
             return false;
         }
         function parseAwaitExpression() {
-            var node = createNode(197);
+            var node = createNode(197 /* AwaitExpression */);
             nextToken();
             node.expression = parseSimpleUnaryExpression();
             return finishNode(node);
         }
+        /**
+         * Parse ES7 exponential expression and await expression
+         *
+         * ES7 ExponentiationExpression:
+         *      1) UnaryExpression[?Yield]
+         *      2) UpdateExpression[?Yield] ** ExponentiationExpression[?Yield]
+         *
+         */
         function parseUnaryExpressionOrHigher() {
+            /**
+             * ES7 UpdateExpression:
+             *      1) LeftHandSideExpression[?Yield]
+             *      2) LeftHandSideExpression[?Yield][no LineTerminator here]++
+             *      3) LeftHandSideExpression[?Yield][no LineTerminator here]--
+             *      4) ++UnaryExpression[?Yield]
+             *      5) --UnaryExpression[?Yield]
+             */
             if (isUpdateExpression()) {
                 var updateExpression = parseUpdateExpression();
-                return token() === 40 ?
+                return token() === 40 /* AsteriskAsteriskToken */ ?
                     parseBinaryExpressionRest(ts.getBinaryOperatorPrecedence(token()), updateExpression) :
                     updateExpression;
             }
+            /**
+             * ES7 UnaryExpression:
+             *      1) UpdateExpression[?yield]
+             *      2) delete UpdateExpression[?yield]
+             *      3) void UpdateExpression[?yield]
+             *      4) typeof UpdateExpression[?yield]
+             *      5) + UpdateExpression[?yield]
+             *      6) - UpdateExpression[?yield]
+             *      7) ~ UpdateExpression[?yield]
+             *      8) ! UpdateExpression[?yield]
+             */
             var unaryOperator = token();
             var simpleUnaryExpression = parseSimpleUnaryExpression();
-            if (token() === 40) {
+            if (token() === 40 /* AsteriskAsteriskToken */) {
                 var pos = ts.skipTrivia(sourceText, simpleUnaryExpression.pos);
                 var end = simpleUnaryExpression.end;
-                if (simpleUnaryExpression.kind === 190) {
+                if (simpleUnaryExpression.kind === 190 /* TypeAssertionExpression */) {
                     parseErrorAt(pos, end, ts.Diagnostics.A_type_assertion_expression_is_not_allowed_in_the_left_hand_side_of_an_exponentiation_expression_Consider_enclosing_the_expression_in_parentheses);
                 }
                 else {
@@ -14569,63 +18417,108 @@ var ts;
             }
             return simpleUnaryExpression;
         }
+        /**
+         * Parse ES7 simple-unary expression or higher:
+         *
+         * ES7 UnaryExpression:
+         *      1) UpdateExpression[?yield]
+         *      2) delete UnaryExpression[?yield]
+         *      3) void UnaryExpression[?yield]
+         *      4) typeof UnaryExpression[?yield]
+         *      5) + UnaryExpression[?yield]
+         *      6) - UnaryExpression[?yield]
+         *      7) ~ UnaryExpression[?yield]
+         *      8) ! UnaryExpression[?yield]
+         *      9) [+Await] await UnaryExpression[?yield]
+         */
         function parseSimpleUnaryExpression() {
             switch (token()) {
-                case 37:
-                case 38:
-                case 52:
-                case 51:
+                case 37 /* PlusToken */:
+                case 38 /* MinusToken */:
+                case 52 /* TildeToken */:
+                case 51 /* ExclamationToken */:
                     return parsePrefixUnaryExpression();
-                case 80:
+                case 80 /* DeleteKeyword */:
                     return parseDeleteExpression();
-                case 103:
+                case 103 /* TypeOfKeyword */:
                     return parseTypeOfExpression();
-                case 105:
+                case 105 /* VoidKeyword */:
                     return parseVoidExpression();
-                case 27:
+                case 27 /* LessThanToken */:
+                    // This is modified UnaryExpression grammar in TypeScript
+                    //  UnaryExpression (modified):
+                    //      < type > UnaryExpression
                     return parseTypeAssertion();
-                case 121:
+                case 121 /* AwaitKeyword */:
                     if (isAwaitExpression()) {
                         return parseAwaitExpression();
                     }
+                // falls through
                 default:
                     return parseUpdateExpression();
             }
         }
+        /**
+         * Check if the current token can possibly be an ES7 increment expression.
+         *
+         * ES7 UpdateExpression:
+         *      LeftHandSideExpression[?Yield]
+         *      LeftHandSideExpression[?Yield][no LineTerminator here]++
+         *      LeftHandSideExpression[?Yield][no LineTerminator here]--
+         *      ++LeftHandSideExpression[?Yield]
+         *      --LeftHandSideExpression[?Yield]
+         */
         function isUpdateExpression() {
+            // This function is called inside parseUnaryExpression to decide
+            // whether to call parseSimpleUnaryExpression or call parseUpdateExpression directly
             switch (token()) {
-                case 37:
-                case 38:
-                case 52:
-                case 51:
-                case 80:
-                case 103:
-                case 105:
-                case 121:
+                case 37 /* PlusToken */:
+                case 38 /* MinusToken */:
+                case 52 /* TildeToken */:
+                case 51 /* ExclamationToken */:
+                case 80 /* DeleteKeyword */:
+                case 103 /* TypeOfKeyword */:
+                case 105 /* VoidKeyword */:
+                case 121 /* AwaitKeyword */:
                     return false;
-                case 27:
-                    if (sourceFile.languageVariant !== 1) {
+                case 27 /* LessThanToken */:
+                    // If we are not in JSX context, we are parsing TypeAssertion which is an UnaryExpression
+                    if (sourceFile.languageVariant !== 1 /* JSX */) {
                         return false;
                     }
+                // We are in JSX context and the token is part of JSXElement.
+                // falls through
                 default:
                     return true;
             }
         }
+        /**
+         * Parse ES7 UpdateExpression. UpdateExpression is used instead of ES6's PostFixExpression.
+         *
+         * ES7 UpdateExpression[yield]:
+         *      1) LeftHandSideExpression[?yield]
+         *      2) LeftHandSideExpression[?yield] [[no LineTerminator here]]++
+         *      3) LeftHandSideExpression[?yield] [[no LineTerminator here]]--
+         *      4) ++LeftHandSideExpression[?yield]
+         *      5) --LeftHandSideExpression[?yield]
+         * In TypeScript (2), (3) are parsed as PostfixUnaryExpression. (4), (5) are parsed as PrefixUnaryExpression
+         */
         function parseUpdateExpression() {
-            if (token() === 43 || token() === 44) {
-                var node = createNode(198);
+            if (token() === 43 /* PlusPlusToken */ || token() === 44 /* MinusMinusToken */) {
+                var node = createNode(198 /* PrefixUnaryExpression */);
                 node.operator = token();
                 nextToken();
                 node.operand = parseLeftHandSideExpressionOrHigher();
                 return finishNode(node);
             }
-            else if (sourceFile.languageVariant === 1 && token() === 27 && lookAhead(nextTokenIsIdentifierOrKeywordOrGreaterThan)) {
-                return parseJsxElementOrSelfClosingElementOrFragment(true);
+            else if (sourceFile.languageVariant === 1 /* JSX */ && token() === 27 /* LessThanToken */ && lookAhead(nextTokenIsIdentifierOrKeywordOrGreaterThan)) {
+                // JSXElement is part of primaryExpression
+                return parseJsxElementOrSelfClosingElementOrFragment(/*inExpressionContext*/ true);
             }
             var expression = parseLeftHandSideExpressionOrHigher();
             ts.Debug.assert(ts.isLeftHandSideExpression(expression));
-            if ((token() === 43 || token() === 44) && !scanner.hasPrecedingLineBreak()) {
-                var node = createNode(199, expression.pos);
+            if ((token() === 43 /* PlusPlusToken */ || token() === 44 /* MinusMinusToken */) && !scanner.hasPrecedingLineBreak()) {
+                var node = createNode(199 /* PostfixUnaryExpression */, expression.pos);
                 node.operand = expression;
                 node.operator = token();
                 nextToken();
@@ -14634,51 +18527,139 @@ var ts;
             return expression;
         }
         function parseLeftHandSideExpressionOrHigher() {
+            // Original Ecma:
+            // LeftHandSideExpression: See 11.2
+            //      NewExpression
+            //      CallExpression
+            //
+            // Our simplification:
+            //
+            // LeftHandSideExpression: See 11.2
+            //      MemberExpression
+            //      CallExpression
+            //
+            // See comment in parseMemberExpressionOrHigher on how we replaced NewExpression with
+            // MemberExpression to make our lives easier.
+            //
+            // to best understand the below code, it's important to see how CallExpression expands
+            // out into its own productions:
+            //
+            // CallExpression:
+            //      MemberExpression Arguments
+            //      CallExpression Arguments
+            //      CallExpression[Expression]
+            //      CallExpression.IdentifierName
+            //      import (AssignmentExpression)
+            //      super Arguments
+            //      super.IdentifierName
+            //
+            // Because of the recursion in these calls, we need to bottom out first. There are three
+            // bottom out states we can run into: 1) We see 'super' which must start either of
+            // the last two CallExpression productions. 2) We see 'import' which must start import call.
+            // 3)we have a MemberExpression which either completes the LeftHandSideExpression,
+            // or starts the beginning of the first four CallExpression productions.
             var expression;
-            if (token() === 91) {
+            if (token() === 91 /* ImportKeyword */) {
                 if (lookAhead(nextTokenIsOpenParenOrLessThan)) {
-                    sourceFile.flags |= 524288;
+                    // We don't want to eagerly consume all import keyword as import call expression so we look ahead to find "("
+                    // For example:
+                    //      var foo3 = require("subfolder
+                    //      import * as foo1 from "module-from-node
+                    // We want this import to be a statement rather than import call expression
+                    sourceFile.flags |= 524288 /* PossiblyContainsDynamicImport */;
                     expression = parseTokenNode();
                 }
                 else if (lookAhead(nextTokenIsDot)) {
+                    // This is an 'import.*' metaproperty (i.e. 'import.meta')
                     var fullStart = scanner.getStartPos();
-                    nextToken();
-                    nextToken();
-                    var node = createNode(210, fullStart);
-                    node.keywordToken = 91;
+                    nextToken(); // advance past the 'import'
+                    nextToken(); // advance past the dot
+                    var node = createNode(210 /* MetaProperty */, fullStart);
+                    node.keywordToken = 91 /* ImportKeyword */;
                     node.name = parseIdentifierName();
                     expression = finishNode(node);
-                    sourceFile.flags |= 1048576;
+                    sourceFile.flags |= 1048576 /* PossiblyContainsImportMeta */;
                 }
                 else {
                     expression = parseMemberExpressionOrHigher();
                 }
             }
             else {
-                expression = token() === 97 ? parseSuperExpression() : parseMemberExpressionOrHigher();
+                expression = token() === 97 /* SuperKeyword */ ? parseSuperExpression() : parseMemberExpressionOrHigher();
             }
+            // Now, we *may* be complete.  However, we might have consumed the start of a
+            // CallExpression.  As such, we need to consume the rest of it here to be complete.
             return parseCallExpressionRest(expression);
         }
         function parseMemberExpressionOrHigher() {
+            // Note: to make our lives simpler, we decompose the NewExpression productions and
+            // place ObjectCreationExpression and FunctionExpression into PrimaryExpression.
+            // like so:
+            //
+            //   PrimaryExpression : See 11.1
+            //      this
+            //      Identifier
+            //      Literal
+            //      ArrayLiteral
+            //      ObjectLiteral
+            //      (Expression)
+            //      FunctionExpression
+            //      new MemberExpression Arguments?
+            //
+            //   MemberExpression : See 11.2
+            //      PrimaryExpression
+            //      MemberExpression[Expression]
+            //      MemberExpression.IdentifierName
+            //
+            //   CallExpression : See 11.2
+            //      MemberExpression
+            //      CallExpression Arguments
+            //      CallExpression[Expression]
+            //      CallExpression.IdentifierName
+            //
+            // Technically this is ambiguous.  i.e. CallExpression defines:
+            //
+            //   CallExpression:
+            //      CallExpression Arguments
+            //
+            // If you see: "new Foo()"
+            //
+            // Then that could be treated as a single ObjectCreationExpression, or it could be
+            // treated as the invocation of "new Foo".  We disambiguate that in code (to match
+            // the original grammar) by making sure that if we see an ObjectCreationExpression
+            // we always consume arguments if they are there. So we treat "new Foo()" as an
+            // object creation only, and not at all as an invocation.  Another way to think
+            // about this is that for every "new" that we see, we will consume an argument list if
+            // it is there as part of the *associated* object creation node.  Any additional
+            // argument lists we see, will become invocation expressions.
+            //
+            // Because there are no other places in the grammar now that refer to FunctionExpression
+            // or ObjectCreationExpression, it is safe to push down into the PrimaryExpression
+            // production.
+            //
+            // Because CallExpression and MemberExpression are left recursive, we need to bottom out
+            // of the recursion immediately.  So we parse out a primary expression to start with.
             var expression = parsePrimaryExpression();
             return parseMemberExpressionRest(expression);
         }
         function parseSuperExpression() {
             var expression = parseTokenNode();
-            if (token() === 19 || token() === 23 || token() === 21) {
+            if (token() === 19 /* OpenParenToken */ || token() === 23 /* DotToken */ || token() === 21 /* OpenBracketToken */) {
                 return expression;
             }
-            var node = createNode(185, expression.pos);
+            // If we have seen "super" it must be followed by '(' or '.'.
+            // If it wasn't then just try to parse out a '.' and report an error.
+            var node = createNode(185 /* PropertyAccessExpression */, expression.pos);
             node.expression = expression;
-            parseExpectedToken(23, ts.Diagnostics.super_must_be_followed_by_an_argument_list_or_member_access);
-            node.name = parseRightSideOfDot(true);
+            parseExpectedToken(23 /* DotToken */, ts.Diagnostics.super_must_be_followed_by_an_argument_list_or_member_access);
+            node.name = parseRightSideOfDot(/*allowIdentifierNames*/ true);
             return finishNode(node);
         }
         function parseJsxElementOrSelfClosingElementOrFragment(inExpressionContext) {
             var opening = parseJsxOpeningOrSelfClosingElementOrOpeningFragment(inExpressionContext);
             var result;
-            if (opening.kind === 257) {
-                var node = createNode(255, opening.pos);
+            if (opening.kind === 257 /* JsxOpeningElement */) {
+                var node = createNode(255 /* JsxElement */, opening.pos);
                 node.openingElement = opening;
                 node.children = parseJsxChildren(node.openingElement);
                 node.closingElement = parseJsxClosingElement(inExpressionContext);
@@ -14687,26 +18668,34 @@ var ts;
                 }
                 result = finishNode(node);
             }
-            else if (opening.kind === 260) {
-                var node = createNode(259, opening.pos);
+            else if (opening.kind === 260 /* JsxOpeningFragment */) {
+                var node = createNode(259 /* JsxFragment */, opening.pos);
                 node.openingFragment = opening;
                 node.children = parseJsxChildren(node.openingFragment);
                 node.closingFragment = parseJsxClosingFragment(inExpressionContext);
                 result = finishNode(node);
             }
             else {
-                ts.Debug.assert(opening.kind === 256);
+                ts.Debug.assert(opening.kind === 256 /* JsxSelfClosingElement */);
+                // Nothing else to do for self-closing elements
                 result = opening;
             }
-            if (inExpressionContext && token() === 27) {
-                var invalidElement = tryParse(function () { return parseJsxElementOrSelfClosingElementOrFragment(true); });
+            // If the user writes the invalid code '<div></div><div></div>' in an expression context (i.e. not wrapped in
+            // an enclosing tag), we'll naively try to parse   ^ this as a 'less than' operator and the remainder of the tag
+            // as garbage, which will cause the formatter to badly mangle the JSX. Perform a speculative parse of a JSX
+            // element if we see a < token so that we can wrap it in a synthetic binary expression so the formatter
+            // does less damage and we can report a better error.
+            // Since JSX elements are invalid < operands anyway, this lookahead parse will only occur in error scenarios
+            // of one sort or another.
+            if (inExpressionContext && token() === 27 /* LessThanToken */) {
+                var invalidElement = tryParse(function () { return parseJsxElementOrSelfClosingElementOrFragment(/*inExpressionContext*/ true); });
                 if (invalidElement) {
                     parseErrorAtCurrentToken(ts.Diagnostics.JSX_expressions_must_have_one_parent_element);
-                    var badNode = createNode(200, result.pos);
+                    var badNode = createNode(200 /* BinaryExpression */, result.pos);
                     badNode.end = invalidElement.end;
                     badNode.left = result;
                     badNode.right = invalidElement;
-                    badNode.operatorToken = createMissingNode(26, false, undefined);
+                    badNode.operatorToken = createMissingNode(26 /* CommaToken */, /*reportAtCurrentPosition*/ false, /*diagnosticMessage*/ undefined); // TODO: GH#18217
                     badNode.operatorToken.pos = badNode.operatorToken.end = badNode.right.pos;
                     return badNode;
                 }
@@ -14714,14 +18703,16 @@ var ts;
             return result;
         }
         function parseJsxText() {
-            var node = createNode(10);
-            node.containsOnlyWhiteSpaces = currentToken === 11;
+            var node = createNode(10 /* JsxText */);
+            node.containsOnlyWhiteSpaces = currentToken === 11 /* JsxTextAllWhiteSpaces */;
             currentToken = scanner.scanJsxToken();
             return finishNode(node);
         }
         function parseJsxChild(openingTag, token) {
             switch (token) {
-                case 1:
+                case 1 /* EndOfFileToken */:
+                    // If we hit EOF, issue the error at the tag that lacks the closing element
+                    // rather than at the end of the file (which is useless)
                     if (ts.isJsxOpeningFragment(openingTag)) {
                         parseErrorAtRange(openingTag, ts.Diagnostics.JSX_fragment_has_no_corresponding_closing_tag);
                     }
@@ -14729,16 +18720,16 @@ var ts;
                         parseErrorAtRange(openingTag.tagName, ts.Diagnostics.JSX_element_0_has_no_corresponding_closing_tag, ts.getTextOfNodeFromSourceText(sourceText, openingTag.tagName));
                     }
                     return undefined;
-                case 28:
-                case 7:
+                case 28 /* LessThanSlashToken */:
+                case 7 /* ConflictMarkerTrivia */:
                     return undefined;
-                case 10:
-                case 11:
+                case 10 /* JsxText */:
+                case 11 /* JsxTextAllWhiteSpaces */:
                     return parseJsxText();
-                case 17:
-                    return parseJsxExpression(false);
-                case 27:
-                    return parseJsxElementOrSelfClosingElementOrFragment(false);
+                case 17 /* OpenBraceToken */:
+                    return parseJsxExpression(/*inExpressionContext*/ false);
+                case 27 /* LessThanToken */:
+                    return parseJsxElementOrSelfClosingElementOrFragment(/*inExpressionContext*/ false);
                 default:
                     return ts.Debug.assertNever(token);
             }
@@ -14747,7 +18738,7 @@ var ts;
             var list = [];
             var listPos = getNodePos();
             var saveParsingContext = parsingContext;
-            parsingContext |= 1 << 14;
+            parsingContext |= 1 << 14 /* JsxChildren */;
             while (true) {
                 var child = parseJsxChild(openingTag, currentToken = scanner.reScanJsxToken());
                 if (!child)
@@ -14758,15 +18749,16 @@ var ts;
             return createNodeArray(list, listPos);
         }
         function parseJsxAttributes() {
-            var jsxAttributes = createNode(263);
-            jsxAttributes.properties = parseList(13, parseJsxAttribute);
+            var jsxAttributes = createNode(263 /* JsxAttributes */);
+            jsxAttributes.properties = parseList(13 /* JsxAttributes */, parseJsxAttribute);
             return finishNode(jsxAttributes);
         }
         function parseJsxOpeningOrSelfClosingElementOrOpeningFragment(inExpressionContext) {
             var fullStart = scanner.getStartPos();
-            parseExpected(27);
-            if (token() === 29) {
-                var node_1 = createNode(260, fullStart);
+            parseExpected(27 /* LessThanToken */);
+            if (token() === 29 /* GreaterThanToken */) {
+                // See below for explanation of scanJsxText
+                var node_1 = createNode(260 /* JsxOpeningFragment */, fullStart);
                 scanJsxText();
                 return finishNode(node_1);
             }
@@ -14774,20 +18766,23 @@ var ts;
             var typeArguments = tryParseTypeArguments();
             var attributes = parseJsxAttributes();
             var node;
-            if (token() === 29) {
-                node = createNode(257, fullStart);
+            if (token() === 29 /* GreaterThanToken */) {
+                // Closing tag, so scan the immediately-following text with the JSX scanning instead
+                // of regular scanning to avoid treating illegal characters (e.g. '#') as immediate
+                // scanning errors
+                node = createNode(257 /* JsxOpeningElement */, fullStart);
                 scanJsxText();
             }
             else {
-                parseExpected(41);
+                parseExpected(41 /* SlashToken */);
                 if (inExpressionContext) {
-                    parseExpected(29);
+                    parseExpected(29 /* GreaterThanToken */);
                 }
                 else {
-                    parseExpected(29, undefined, false);
+                    parseExpected(29 /* GreaterThanToken */, /*diagnostic*/ undefined, /*shouldAdvance*/ false);
                     scanJsxText();
                 }
-                node = createNode(256, fullStart);
+                node = createNode(256 /* JsxSelfClosingElement */, fullStart);
             }
             node.tagName = tagName;
             node.typeArguments = typeArguments;
@@ -14796,119 +18791,125 @@ var ts;
         }
         function parseJsxElementName() {
             scanJsxIdentifier();
-            var expression = token() === 99 ?
+            // JsxElement can have name in the form of
+            //      propertyAccessExpression
+            //      primaryExpression in the form of an identifier and "this" keyword
+            // We can't just simply use parseLeftHandSideExpressionOrHigher because then we will start consider class,function etc as a keyword
+            // We only want to consider "this" as a primaryExpression
+            var expression = token() === 99 /* ThisKeyword */ ?
                 parseTokenNode() : parseIdentifierName();
-            while (parseOptional(23)) {
-                var propertyAccess = createNode(185, expression.pos);
+            while (parseOptional(23 /* DotToken */)) {
+                var propertyAccess = createNode(185 /* PropertyAccessExpression */, expression.pos);
                 propertyAccess.expression = expression;
-                propertyAccess.name = parseRightSideOfDot(true);
+                propertyAccess.name = parseRightSideOfDot(/*allowIdentifierNames*/ true);
                 expression = finishNode(propertyAccess);
             }
             return expression;
         }
         function parseJsxExpression(inExpressionContext) {
-            var node = createNode(265);
-            if (!parseExpected(17)) {
+            var node = createNode(265 /* JsxExpression */);
+            if (!parseExpected(17 /* OpenBraceToken */)) {
                 return undefined;
             }
-            if (token() !== 18) {
-                node.dotDotDotToken = parseOptionalToken(24);
+            if (token() !== 18 /* CloseBraceToken */) {
+                node.dotDotDotToken = parseOptionalToken(24 /* DotDotDotToken */);
                 node.expression = parseAssignmentExpressionOrHigher();
             }
             if (inExpressionContext) {
-                parseExpected(18);
+                parseExpected(18 /* CloseBraceToken */);
             }
             else {
-                parseExpected(18, undefined, false);
+                parseExpected(18 /* CloseBraceToken */, /*message*/ undefined, /*shouldAdvance*/ false);
                 scanJsxText();
             }
             return finishNode(node);
         }
         function parseJsxAttribute() {
-            if (token() === 17) {
+            if (token() === 17 /* OpenBraceToken */) {
                 return parseJsxSpreadAttribute();
             }
             scanJsxIdentifier();
-            var node = createNode(262);
+            var node = createNode(262 /* JsxAttribute */);
             node.name = parseIdentifierName();
-            if (token() === 58) {
+            if (token() === 58 /* EqualsToken */) {
                 switch (scanJsxAttributeValue()) {
-                    case 9:
+                    case 9 /* StringLiteral */:
                         node.initializer = parseLiteralNode();
                         break;
                     default:
-                        node.initializer = parseJsxExpression(true);
+                        node.initializer = parseJsxExpression(/*inExpressionContext*/ true);
                         break;
                 }
             }
             return finishNode(node);
         }
         function parseJsxSpreadAttribute() {
-            var node = createNode(264);
-            parseExpected(17);
-            parseExpected(24);
+            var node = createNode(264 /* JsxSpreadAttribute */);
+            parseExpected(17 /* OpenBraceToken */);
+            parseExpected(24 /* DotDotDotToken */);
             node.expression = parseExpression();
-            parseExpected(18);
+            parseExpected(18 /* CloseBraceToken */);
             return finishNode(node);
         }
         function parseJsxClosingElement(inExpressionContext) {
-            var node = createNode(258);
-            parseExpected(28);
+            var node = createNode(258 /* JsxClosingElement */);
+            parseExpected(28 /* LessThanSlashToken */);
             node.tagName = parseJsxElementName();
             if (inExpressionContext) {
-                parseExpected(29);
+                parseExpected(29 /* GreaterThanToken */);
             }
             else {
-                parseExpected(29, undefined, false);
+                parseExpected(29 /* GreaterThanToken */, /*diagnostic*/ undefined, /*shouldAdvance*/ false);
                 scanJsxText();
             }
             return finishNode(node);
         }
         function parseJsxClosingFragment(inExpressionContext) {
-            var node = createNode(261);
-            parseExpected(28);
+            var node = createNode(261 /* JsxClosingFragment */);
+            parseExpected(28 /* LessThanSlashToken */);
             if (ts.tokenIsIdentifierOrKeyword(token())) {
                 parseErrorAtRange(parseJsxElementName(), ts.Diagnostics.Expected_corresponding_closing_tag_for_JSX_fragment);
             }
             if (inExpressionContext) {
-                parseExpected(29);
+                parseExpected(29 /* GreaterThanToken */);
             }
             else {
-                parseExpected(29, undefined, false);
+                parseExpected(29 /* GreaterThanToken */, /*diagnostic*/ undefined, /*shouldAdvance*/ false);
                 scanJsxText();
             }
             return finishNode(node);
         }
         function parseTypeAssertion() {
-            var node = createNode(190);
-            parseExpected(27);
+            var node = createNode(190 /* TypeAssertionExpression */);
+            parseExpected(27 /* LessThanToken */);
             node.type = parseType();
-            parseExpected(29);
+            parseExpected(29 /* GreaterThanToken */);
             node.expression = parseSimpleUnaryExpression();
             return finishNode(node);
         }
         function parseMemberExpressionRest(expression) {
             while (true) {
-                var dotToken = parseOptionalToken(23);
+                var dotToken = parseOptionalToken(23 /* DotToken */);
                 if (dotToken) {
-                    var propertyAccess = createNode(185, expression.pos);
+                    var propertyAccess = createNode(185 /* PropertyAccessExpression */, expression.pos);
                     propertyAccess.expression = expression;
-                    propertyAccess.name = parseRightSideOfDot(true);
+                    propertyAccess.name = parseRightSideOfDot(/*allowIdentifierNames*/ true);
                     expression = finishNode(propertyAccess);
                     continue;
                 }
-                if (token() === 51 && !scanner.hasPrecedingLineBreak()) {
+                if (token() === 51 /* ExclamationToken */ && !scanner.hasPrecedingLineBreak()) {
                     nextToken();
-                    var nonNullExpression = createNode(209, expression.pos);
+                    var nonNullExpression = createNode(209 /* NonNullExpression */, expression.pos);
                     nonNullExpression.expression = expression;
                     expression = finishNode(nonNullExpression);
                     continue;
                 }
-                if (!inDecoratorContext() && parseOptional(21)) {
-                    var indexedAccess = createNode(186, expression.pos);
+                // when in the [Decorator] context, we do not parse ElementAccess as it could be part of a ComputedPropertyName
+                if (!inDecoratorContext() && parseOptional(21 /* OpenBracketToken */)) {
+                    var indexedAccess = createNode(186 /* ElementAccessExpression */, expression.pos);
                     indexedAccess.expression = expression;
-                    if (token() === 22) {
-                        indexedAccess.argumentExpression = createMissingNode(71, true, ts.Diagnostics.An_element_access_expression_should_take_an_argument);
+                    if (token() === 22 /* CloseBracketToken */) {
+                        indexedAccess.argumentExpression = createMissingNode(71 /* Identifier */, /*reportAtCurrentPosition*/ true, ts.Diagnostics.An_element_access_expression_should_take_an_argument);
                     }
                     else {
                         var argument = allowInAnd(parseExpression);
@@ -14917,25 +18918,25 @@ var ts;
                         }
                         indexedAccess.argumentExpression = argument;
                     }
-                    parseExpected(22);
+                    parseExpected(22 /* CloseBracketToken */);
                     expression = finishNode(indexedAccess);
                     continue;
                 }
                 if (isTemplateStartOfTaggedTemplate()) {
-                    expression = parseTaggedTemplateRest(expression, undefined);
+                    expression = parseTaggedTemplateRest(expression, /*typeArguments*/ undefined);
                     continue;
                 }
                 return expression;
             }
         }
         function isTemplateStartOfTaggedTemplate() {
-            return token() === 13 || token() === 14;
+            return token() === 13 /* NoSubstitutionTemplateLiteral */ || token() === 14 /* TemplateHead */;
         }
         function parseTaggedTemplateRest(tag, typeArguments) {
-            var tagExpression = createNode(189, tag.pos);
+            var tagExpression = createNode(189 /* TaggedTemplateExpression */, tag.pos);
             tagExpression.tag = tag;
             tagExpression.typeArguments = typeArguments;
-            tagExpression.template = token() === 13
+            tagExpression.template = token() === 13 /* NoSubstitutionTemplateLiteral */
                 ? parseLiteralNode()
                 : parseTemplateExpression();
             return finishNode(tagExpression);
@@ -14943,7 +18944,11 @@ var ts;
         function parseCallExpressionRest(expression) {
             while (true) {
                 expression = parseMemberExpressionRest(expression);
-                if (token() === 27) {
+                if (token() === 27 /* LessThanToken */) {
+                    // See if this is the start of a generic invocation.  If so, consume it and
+                    // keep checking for postfix expressions.  Otherwise, it's just a '<' that's
+                    // part of an arithmetic expression.  Break out so we consume it higher in the
+                    // stack.
                     var typeArguments = tryParse(parseTypeArgumentsInExpression);
                     if (!typeArguments) {
                         return expression;
@@ -14952,15 +18957,15 @@ var ts;
                         expression = parseTaggedTemplateRest(expression, typeArguments);
                         continue;
                     }
-                    var callExpr = createNode(187, expression.pos);
+                    var callExpr = createNode(187 /* CallExpression */, expression.pos);
                     callExpr.expression = expression;
                     callExpr.typeArguments = typeArguments;
                     callExpr.arguments = parseArgumentList();
                     expression = finishNode(callExpr);
                     continue;
                 }
-                else if (token() === 19) {
-                    var callExpr = createNode(187, expression.pos);
+                else if (token() === 19 /* OpenParenToken */) {
+                    var callExpr = createNode(187 /* CallExpression */, expression.pos);
                     callExpr.expression = expression;
                     callExpr.arguments = parseArgumentList();
                     expression = finishNode(callExpr);
@@ -14970,191 +18975,217 @@ var ts;
             }
         }
         function parseArgumentList() {
-            parseExpected(19);
-            var result = parseDelimitedList(11, parseArgumentExpression);
-            parseExpected(20);
+            parseExpected(19 /* OpenParenToken */);
+            var result = parseDelimitedList(11 /* ArgumentExpressions */, parseArgumentExpression);
+            parseExpected(20 /* CloseParenToken */);
             return result;
         }
         function parseTypeArgumentsInExpression() {
-            if (!parseOptional(27)) {
+            if (!parseOptional(27 /* LessThanToken */)) {
                 return undefined;
             }
-            var typeArguments = parseDelimitedList(19, parseType);
-            if (!parseExpected(29)) {
+            var typeArguments = parseDelimitedList(19 /* TypeArguments */, parseType);
+            if (!parseExpected(29 /* GreaterThanToken */)) {
+                // If it doesn't have the closing `>` then it's definitely not an type argument list.
                 return undefined;
             }
+            // If we have a '<', then only parse this as a argument list if the type arguments
+            // are complete and we have an open paren.  if we don't, rewind and return nothing.
             return typeArguments && canFollowTypeArgumentsInExpression()
                 ? typeArguments
                 : undefined;
         }
         function canFollowTypeArgumentsInExpression() {
             switch (token()) {
-                case 19:
-                case 13:
-                case 14:
-                case 23:
-                case 20:
-                case 22:
-                case 56:
-                case 25:
-                case 55:
-                case 32:
-                case 34:
-                case 33:
-                case 35:
-                case 53:
-                case 54:
-                case 50:
-                case 48:
-                case 49:
-                case 18:
-                case 1:
+                case 19 /* OpenParenToken */: // foo<x>(
+                case 13 /* NoSubstitutionTemplateLiteral */: // foo<T> `...`
+                case 14 /* TemplateHead */: // foo<T> `...${100}...`
+                // these are the only tokens can legally follow a type argument
+                // list. So we definitely want to treat them as type arg lists.
+                case 23 /* DotToken */: // foo<x>.
+                case 20 /* CloseParenToken */: // foo<x>)
+                case 22 /* CloseBracketToken */: // foo<x>]
+                case 56 /* ColonToken */: // foo<x>:
+                case 25 /* SemicolonToken */: // foo<x>;
+                case 55 /* QuestionToken */: // foo<x>?
+                case 32 /* EqualsEqualsToken */: // foo<x> ==
+                case 34 /* EqualsEqualsEqualsToken */: // foo<x> ===
+                case 33 /* ExclamationEqualsToken */: // foo<x> !=
+                case 35 /* ExclamationEqualsEqualsToken */: // foo<x> !==
+                case 53 /* AmpersandAmpersandToken */: // foo<x> &&
+                case 54 /* BarBarToken */: // foo<x> ||
+                case 50 /* CaretToken */: // foo<x> ^
+                case 48 /* AmpersandToken */: // foo<x> &
+                case 49 /* BarToken */: // foo<x> |
+                case 18 /* CloseBraceToken */: // foo<x> }
+                case 1 /* EndOfFileToken */: // foo<x>
+                    // these cases can't legally follow a type arg list.  However, they're not legal
+                    // expressions either.  The user is probably in the middle of a generic type. So
+                    // treat it as such.
                     return true;
-                case 26:
-                case 17:
+                case 26 /* CommaToken */: // foo<x>,
+                case 17 /* OpenBraceToken */: // foo<x> {
+                // We don't want to treat these as type arguments.  Otherwise we'll parse this
+                // as an invocation expression.  Instead, we want to parse out the expression
+                // in isolation from the type arguments.
                 default:
+                    // Anything else treat as an expression.
                     return false;
             }
         }
         function parsePrimaryExpression() {
             switch (token()) {
-                case 8:
-                case 9:
-                case 13:
+                case 8 /* NumericLiteral */:
+                case 9 /* StringLiteral */:
+                case 13 /* NoSubstitutionTemplateLiteral */:
                     return parseLiteralNode();
-                case 99:
-                case 97:
-                case 95:
-                case 101:
-                case 86:
+                case 99 /* ThisKeyword */:
+                case 97 /* SuperKeyword */:
+                case 95 /* NullKeyword */:
+                case 101 /* TrueKeyword */:
+                case 86 /* FalseKeyword */:
                     return parseTokenNode();
-                case 19:
+                case 19 /* OpenParenToken */:
                     return parseParenthesizedExpression();
-                case 21:
+                case 21 /* OpenBracketToken */:
                     return parseArrayLiteralExpression();
-                case 17:
+                case 17 /* OpenBraceToken */:
                     return parseObjectLiteralExpression();
-                case 120:
+                case 120 /* AsyncKeyword */:
+                    // Async arrow functions are parsed earlier in parseAssignmentExpressionOrHigher.
+                    // If we encounter `async [no LineTerminator here] function` then this is an async
+                    // function; otherwise, its an identifier.
                     if (!lookAhead(nextTokenIsFunctionKeywordOnSameLine)) {
                         break;
                     }
                     return parseFunctionExpression();
-                case 75:
+                case 75 /* ClassKeyword */:
                     return parseClassExpression();
-                case 89:
+                case 89 /* FunctionKeyword */:
                     return parseFunctionExpression();
-                case 94:
+                case 94 /* NewKeyword */:
                     return parseNewExpressionOrNewDotTarget();
-                case 41:
-                case 63:
-                    if (reScanSlashToken() === 12) {
+                case 41 /* SlashToken */:
+                case 63 /* SlashEqualsToken */:
+                    if (reScanSlashToken() === 12 /* RegularExpressionLiteral */) {
                         return parseLiteralNode();
                     }
                     break;
-                case 14:
+                case 14 /* TemplateHead */:
                     return parseTemplateExpression();
             }
             return parseIdentifier(ts.Diagnostics.Expression_expected);
         }
         function parseParenthesizedExpression() {
-            var node = createNodeWithJSDoc(191);
-            parseExpected(19);
+            var node = createNodeWithJSDoc(191 /* ParenthesizedExpression */);
+            parseExpected(19 /* OpenParenToken */);
             node.expression = allowInAnd(parseExpression);
-            parseExpected(20);
+            parseExpected(20 /* CloseParenToken */);
             return finishNode(node);
         }
         function parseSpreadElement() {
-            var node = createNode(204);
-            parseExpected(24);
+            var node = createNode(204 /* SpreadElement */);
+            parseExpected(24 /* DotDotDotToken */);
             node.expression = parseAssignmentExpressionOrHigher();
             return finishNode(node);
         }
         function parseArgumentOrArrayLiteralElement() {
-            return token() === 24 ? parseSpreadElement() :
-                token() === 26 ? createNode(206) :
+            return token() === 24 /* DotDotDotToken */ ? parseSpreadElement() :
+                token() === 26 /* CommaToken */ ? createNode(206 /* OmittedExpression */) :
                     parseAssignmentExpressionOrHigher();
         }
         function parseArgumentExpression() {
             return doOutsideOfContext(disallowInAndDecoratorContext, parseArgumentOrArrayLiteralElement);
         }
         function parseArrayLiteralExpression() {
-            var node = createNode(183);
-            parseExpected(21);
+            var node = createNode(183 /* ArrayLiteralExpression */);
+            parseExpected(21 /* OpenBracketToken */);
             if (scanner.hasPrecedingLineBreak()) {
                 node.multiLine = true;
             }
-            node.elements = parseDelimitedList(15, parseArgumentOrArrayLiteralElement);
-            parseExpected(22);
+            node.elements = parseDelimitedList(15 /* ArrayLiteralMembers */, parseArgumentOrArrayLiteralElement);
+            parseExpected(22 /* CloseBracketToken */);
             return finishNode(node);
         }
         function parseObjectLiteralElement() {
-            var node = createNodeWithJSDoc(0);
-            if (parseOptionalToken(24)) {
-                node.kind = 272;
+            var node = createNodeWithJSDoc(0 /* Unknown */);
+            if (parseOptionalToken(24 /* DotDotDotToken */)) {
+                node.kind = 272 /* SpreadAssignment */;
                 node.expression = parseAssignmentExpressionOrHigher();
                 return finishNode(node);
             }
             node.decorators = parseDecorators();
             node.modifiers = parseModifiers();
-            if (parseContextualModifier(125)) {
-                return parseAccessorDeclaration(node, 156);
+            if (parseContextualModifier(125 /* GetKeyword */)) {
+                return parseAccessorDeclaration(node, 156 /* GetAccessor */);
             }
-            if (parseContextualModifier(136)) {
-                return parseAccessorDeclaration(node, 157);
+            if (parseContextualModifier(136 /* SetKeyword */)) {
+                return parseAccessorDeclaration(node, 157 /* SetAccessor */);
             }
-            var asteriskToken = parseOptionalToken(39);
+            var asteriskToken = parseOptionalToken(39 /* AsteriskToken */);
             var tokenIsIdentifier = isIdentifier();
             node.name = parsePropertyName();
-            node.questionToken = parseOptionalToken(55);
-            if (asteriskToken || token() === 19 || token() === 27) {
+            // Disallowing of optional property assignments happens in the grammar checker.
+            node.questionToken = parseOptionalToken(55 /* QuestionToken */);
+            if (asteriskToken || token() === 19 /* OpenParenToken */ || token() === 27 /* LessThanToken */) {
                 return parseMethodDeclaration(node, asteriskToken);
             }
-            var isShorthandPropertyAssignment = tokenIsIdentifier && (token() === 26 || token() === 18 || token() === 58);
+            // check if it is short-hand property assignment or normal property assignment
+            // NOTE: if token is EqualsToken it is interpreted as CoverInitializedName production
+            // CoverInitializedName[Yield] :
+            //     IdentifierReference[?Yield] Initializer[In, ?Yield]
+            // this is necessary because ObjectLiteral productions are also used to cover grammar for ObjectAssignmentPattern
+            var isShorthandPropertyAssignment = tokenIsIdentifier && (token() === 26 /* CommaToken */ || token() === 18 /* CloseBraceToken */ || token() === 58 /* EqualsToken */);
             if (isShorthandPropertyAssignment) {
-                node.kind = 271;
-                var equalsToken = parseOptionalToken(58);
+                node.kind = 271 /* ShorthandPropertyAssignment */;
+                var equalsToken = parseOptionalToken(58 /* EqualsToken */);
                 if (equalsToken) {
                     node.equalsToken = equalsToken;
                     node.objectAssignmentInitializer = allowInAnd(parseAssignmentExpressionOrHigher);
                 }
             }
             else {
-                node.kind = 270;
-                parseExpected(56);
+                node.kind = 270 /* PropertyAssignment */;
+                parseExpected(56 /* ColonToken */);
                 node.initializer = allowInAnd(parseAssignmentExpressionOrHigher);
             }
             return finishNode(node);
         }
         function parseObjectLiteralExpression() {
-            var node = createNode(184);
-            parseExpected(17);
+            var node = createNode(184 /* ObjectLiteralExpression */);
+            parseExpected(17 /* OpenBraceToken */);
             if (scanner.hasPrecedingLineBreak()) {
                 node.multiLine = true;
             }
-            node.properties = parseDelimitedList(12, parseObjectLiteralElement, true);
-            parseExpected(18);
+            node.properties = parseDelimitedList(12 /* ObjectLiteralMembers */, parseObjectLiteralElement, /*considerSemicolonAsDelimiter*/ true);
+            parseExpected(18 /* CloseBraceToken */);
             return finishNode(node);
         }
         function parseFunctionExpression() {
+            // GeneratorExpression:
+            //      function* BindingIdentifier [Yield][opt](FormalParameters[Yield]){ GeneratorBody }
+            //
+            // FunctionExpression:
+            //      function BindingIdentifier[opt](FormalParameters){ FunctionBody }
             var saveDecoratorContext = inDecoratorContext();
             if (saveDecoratorContext) {
-                setDecoratorContext(false);
+                setDecoratorContext(/*val*/ false);
             }
-            var node = createNodeWithJSDoc(192);
+            var node = createNodeWithJSDoc(192 /* FunctionExpression */);
             node.modifiers = parseModifiers();
-            parseExpected(89);
-            node.asteriskToken = parseOptionalToken(39);
-            var isGenerator = node.asteriskToken ? 1 : 0;
-            var isAsync = ts.hasModifier(node, 256) ? 2 : 0;
+            parseExpected(89 /* FunctionKeyword */);
+            node.asteriskToken = parseOptionalToken(39 /* AsteriskToken */);
+            var isGenerator = node.asteriskToken ? 1 /* Yield */ : 0 /* None */;
+            var isAsync = ts.hasModifier(node, 256 /* Async */) ? 2 /* Await */ : 0 /* None */;
             node.name =
                 isGenerator && isAsync ? doInYieldAndAwaitContext(parseOptionalIdentifier) :
                     isGenerator ? doInYieldContext(parseOptionalIdentifier) :
                         isAsync ? doInAwaitContext(parseOptionalIdentifier) :
                             parseOptionalIdentifier();
-            fillSignature(56, isGenerator | isAsync, node);
+            fillSignature(56 /* ColonToken */, isGenerator | isAsync, node);
             node.body = parseFunctionBlock(isGenerator | isAsync);
             if (saveDecoratorContext) {
-                setDecoratorContext(true);
+                setDecoratorContext(/*val*/ true);
             }
             return finishNode(node);
         }
@@ -15163,10 +19194,10 @@ var ts;
         }
         function parseNewExpressionOrNewDotTarget() {
             var fullStart = scanner.getStartPos();
-            parseExpected(94);
-            if (parseOptional(23)) {
-                var node_2 = createNode(210, fullStart);
-                node_2.keywordToken = 94;
+            parseExpected(94 /* NewKeyword */);
+            if (parseOptional(23 /* DotToken */)) {
+                var node_2 = createNode(210 /* MetaProperty */, fullStart);
+                node_2.keywordToken = 94 /* NewKeyword */;
                 node_2.name = parseIdentifierName();
                 return finishNode(node_2);
             }
@@ -15182,22 +19213,23 @@ var ts;
                 }
                 break;
             }
-            var node = createNode(188, fullStart);
+            var node = createNode(188 /* NewExpression */, fullStart);
             node.expression = expression;
             node.typeArguments = typeArguments;
-            if (node.typeArguments || token() === 19) {
+            if (node.typeArguments || token() === 19 /* OpenParenToken */) {
                 node.arguments = parseArgumentList();
             }
             return finishNode(node);
         }
+        // STATEMENTS
         function parseBlock(ignoreMissingOpenBrace, diagnosticMessage) {
-            var node = createNode(213);
-            if (parseExpected(17, diagnosticMessage) || ignoreMissingOpenBrace) {
+            var node = createNode(213 /* Block */);
+            if (parseExpected(17 /* OpenBraceToken */, diagnosticMessage) || ignoreMissingOpenBrace) {
                 if (scanner.hasPrecedingLineBreak()) {
                     node.multiLine = true;
                 }
-                node.statements = parseList(1, parseStatement);
-                parseExpected(18);
+                node.statements = parseList(1 /* BlockStatements */, parseStatement);
+                parseExpected(18 /* CloseBraceToken */);
             }
             else {
                 node.statements = createMissingList();
@@ -15206,98 +19238,104 @@ var ts;
         }
         function parseFunctionBlock(flags, diagnosticMessage) {
             var savedYieldContext = inYieldContext();
-            setYieldContext(!!(flags & 1));
+            setYieldContext(!!(flags & 1 /* Yield */));
             var savedAwaitContext = inAwaitContext();
-            setAwaitContext(!!(flags & 2));
+            setAwaitContext(!!(flags & 2 /* Await */));
+            // We may be in a [Decorator] context when parsing a function expression or
+            // arrow function. The body of the function is not in [Decorator] context.
             var saveDecoratorContext = inDecoratorContext();
             if (saveDecoratorContext) {
-                setDecoratorContext(false);
+                setDecoratorContext(/*val*/ false);
             }
-            var block = parseBlock(!!(flags & 16), diagnosticMessage);
+            var block = parseBlock(!!(flags & 16 /* IgnoreMissingOpenBrace */), diagnosticMessage);
             if (saveDecoratorContext) {
-                setDecoratorContext(true);
+                setDecoratorContext(/*val*/ true);
             }
             setYieldContext(savedYieldContext);
             setAwaitContext(savedAwaitContext);
             return block;
         }
         function parseEmptyStatement() {
-            var node = createNode(215);
-            parseExpected(25);
+            var node = createNode(215 /* EmptyStatement */);
+            parseExpected(25 /* SemicolonToken */);
             return finishNode(node);
         }
         function parseIfStatement() {
-            var node = createNode(217);
-            parseExpected(90);
-            parseExpected(19);
+            var node = createNode(217 /* IfStatement */);
+            parseExpected(90 /* IfKeyword */);
+            parseExpected(19 /* OpenParenToken */);
             node.expression = allowInAnd(parseExpression);
-            parseExpected(20);
+            parseExpected(20 /* CloseParenToken */);
             node.thenStatement = parseStatement();
-            node.elseStatement = parseOptional(82) ? parseStatement() : undefined;
+            node.elseStatement = parseOptional(82 /* ElseKeyword */) ? parseStatement() : undefined;
             return finishNode(node);
         }
         function parseDoStatement() {
-            var node = createNode(218);
-            parseExpected(81);
+            var node = createNode(218 /* DoStatement */);
+            parseExpected(81 /* DoKeyword */);
             node.statement = parseStatement();
-            parseExpected(106);
-            parseExpected(19);
+            parseExpected(106 /* WhileKeyword */);
+            parseExpected(19 /* OpenParenToken */);
             node.expression = allowInAnd(parseExpression);
-            parseExpected(20);
-            parseOptional(25);
+            parseExpected(20 /* CloseParenToken */);
+            // From: https://mail.mozilla.org/pipermail/es-discuss/2011-August/016188.html
+            // 157 min --- All allen at wirfs-brock.com CONF --- "do{;}while(false)false" prohibited in
+            // spec but allowed in consensus reality. Approved -- this is the de-facto standard whereby
+            //  do;while(0)x will have a semicolon inserted before x.
+            parseOptional(25 /* SemicolonToken */);
             return finishNode(node);
         }
         function parseWhileStatement() {
-            var node = createNode(219);
-            parseExpected(106);
-            parseExpected(19);
+            var node = createNode(219 /* WhileStatement */);
+            parseExpected(106 /* WhileKeyword */);
+            parseExpected(19 /* OpenParenToken */);
             node.expression = allowInAnd(parseExpression);
-            parseExpected(20);
+            parseExpected(20 /* CloseParenToken */);
             node.statement = parseStatement();
             return finishNode(node);
         }
         function parseForOrForInOrForOfStatement() {
             var pos = getNodePos();
-            parseExpected(88);
-            var awaitToken = parseOptionalToken(121);
-            parseExpected(19);
+            parseExpected(88 /* ForKeyword */);
+            var awaitToken = parseOptionalToken(121 /* AwaitKeyword */);
+            parseExpected(19 /* OpenParenToken */);
             var initializer;
-            if (token() !== 25) {
-                if (token() === 104 || token() === 110 || token() === 76) {
-                    initializer = parseVariableDeclarationList(true);
+            if (token() !== 25 /* SemicolonToken */) {
+                if (token() === 104 /* VarKeyword */ || token() === 110 /* LetKeyword */ || token() === 76 /* ConstKeyword */) {
+                    initializer = parseVariableDeclarationList(/*inForStatementInitializer*/ true);
                 }
                 else {
                     initializer = disallowInAnd(parseExpression);
                 }
             }
             var forOrForInOrForOfStatement;
-            if (awaitToken ? parseExpected(145) : parseOptional(145)) {
-                var forOfStatement = createNode(222, pos);
+            if (awaitToken ? parseExpected(145 /* OfKeyword */) : parseOptional(145 /* OfKeyword */)) {
+                var forOfStatement = createNode(222 /* ForOfStatement */, pos);
                 forOfStatement.awaitModifier = awaitToken;
                 forOfStatement.initializer = initializer;
                 forOfStatement.expression = allowInAnd(parseAssignmentExpressionOrHigher);
-                parseExpected(20);
+                parseExpected(20 /* CloseParenToken */);
                 forOrForInOrForOfStatement = forOfStatement;
             }
-            else if (parseOptional(92)) {
-                var forInStatement = createNode(221, pos);
+            else if (parseOptional(92 /* InKeyword */)) {
+                var forInStatement = createNode(221 /* ForInStatement */, pos);
                 forInStatement.initializer = initializer;
                 forInStatement.expression = allowInAnd(parseExpression);
-                parseExpected(20);
+                parseExpected(20 /* CloseParenToken */);
                 forOrForInOrForOfStatement = forInStatement;
             }
             else {
-                var forStatement = createNode(220, pos);
+                var forStatement = createNode(220 /* ForStatement */, pos);
                 forStatement.initializer = initializer;
-                parseExpected(25);
-                if (token() !== 25 && token() !== 20) {
+                parseExpected(25 /* SemicolonToken */);
+                if (token() !== 25 /* SemicolonToken */ && token() !== 20 /* CloseParenToken */) {
                     forStatement.condition = allowInAnd(parseExpression);
                 }
-                parseExpected(25);
-                if (token() !== 20) {
+                parseExpected(25 /* SemicolonToken */);
+                if (token() !== 20 /* CloseParenToken */) {
                     forStatement.incrementor = allowInAnd(parseExpression);
                 }
-                parseExpected(20);
+                parseExpected(20 /* CloseParenToken */);
                 forOrForInOrForOfStatement = forStatement;
             }
             forOrForInOrForOfStatement.statement = parseStatement();
@@ -15305,7 +19343,7 @@ var ts;
         }
         function parseBreakOrContinueStatement(kind) {
             var node = createNode(kind);
-            parseExpected(kind === 224 ? 72 : 77);
+            parseExpected(kind === 224 /* BreakStatement */ ? 72 /* BreakKeyword */ : 77 /* ContinueKeyword */);
             if (!canParseSemicolon()) {
                 node.label = parseIdentifier();
             }
@@ -15313,8 +19351,8 @@ var ts;
             return finishNode(node);
         }
         function parseReturnStatement() {
-            var node = createNode(225);
-            parseExpected(96);
+            var node = createNode(225 /* ReturnStatement */);
+            parseExpected(96 /* ReturnKeyword */);
             if (!canParseSemicolon()) {
                 node.expression = allowInAnd(parseExpression);
             }
@@ -15322,92 +19360,106 @@ var ts;
             return finishNode(node);
         }
         function parseWithStatement() {
-            var node = createNode(226);
-            parseExpected(107);
-            parseExpected(19);
+            var node = createNode(226 /* WithStatement */);
+            parseExpected(107 /* WithKeyword */);
+            parseExpected(19 /* OpenParenToken */);
             node.expression = allowInAnd(parseExpression);
-            parseExpected(20);
-            node.statement = doInsideOfContext(8388608, parseStatement);
+            parseExpected(20 /* CloseParenToken */);
+            node.statement = doInsideOfContext(8388608 /* InWithStatement */, parseStatement);
             return finishNode(node);
         }
         function parseCaseClause() {
-            var node = createNode(266);
-            parseExpected(73);
+            var node = createNode(266 /* CaseClause */);
+            parseExpected(73 /* CaseKeyword */);
             node.expression = allowInAnd(parseExpression);
-            parseExpected(56);
-            node.statements = parseList(3, parseStatement);
+            parseExpected(56 /* ColonToken */);
+            node.statements = parseList(3 /* SwitchClauseStatements */, parseStatement);
             return finishNode(node);
         }
         function parseDefaultClause() {
-            var node = createNode(267);
-            parseExpected(79);
-            parseExpected(56);
-            node.statements = parseList(3, parseStatement);
+            var node = createNode(267 /* DefaultClause */);
+            parseExpected(79 /* DefaultKeyword */);
+            parseExpected(56 /* ColonToken */);
+            node.statements = parseList(3 /* SwitchClauseStatements */, parseStatement);
             return finishNode(node);
         }
         function parseCaseOrDefaultClause() {
-            return token() === 73 ? parseCaseClause() : parseDefaultClause();
+            return token() === 73 /* CaseKeyword */ ? parseCaseClause() : parseDefaultClause();
         }
         function parseSwitchStatement() {
-            var node = createNode(227);
-            parseExpected(98);
-            parseExpected(19);
+            var node = createNode(227 /* SwitchStatement */);
+            parseExpected(98 /* SwitchKeyword */);
+            parseExpected(19 /* OpenParenToken */);
             node.expression = allowInAnd(parseExpression);
-            parseExpected(20);
-            var caseBlock = createNode(241);
-            parseExpected(17);
-            caseBlock.clauses = parseList(2, parseCaseOrDefaultClause);
-            parseExpected(18);
+            parseExpected(20 /* CloseParenToken */);
+            var caseBlock = createNode(241 /* CaseBlock */);
+            parseExpected(17 /* OpenBraceToken */);
+            caseBlock.clauses = parseList(2 /* SwitchClauses */, parseCaseOrDefaultClause);
+            parseExpected(18 /* CloseBraceToken */);
             node.caseBlock = finishNode(caseBlock);
             return finishNode(node);
         }
         function parseThrowStatement() {
-            var node = createNode(229);
-            parseExpected(100);
+            // ThrowStatement[Yield] :
+            //      throw [no LineTerminator here]Expression[In, ?Yield];
+            // Because of automatic semicolon insertion, we need to report error if this
+            // throw could be terminated with a semicolon.  Note: we can't call 'parseExpression'
+            // directly as that might consume an expression on the following line.
+            // We just return 'undefined' in that case.  The actual error will be reported in the
+            // grammar walker.
+            var node = createNode(229 /* ThrowStatement */);
+            parseExpected(100 /* ThrowKeyword */);
             node.expression = scanner.hasPrecedingLineBreak() ? undefined : allowInAnd(parseExpression);
             parseSemicolon();
             return finishNode(node);
         }
+        // TODO: Review for error recovery
         function parseTryStatement() {
-            var node = createNode(230);
-            parseExpected(102);
-            node.tryBlock = parseBlock(false);
-            node.catchClause = token() === 74 ? parseCatchClause() : undefined;
-            if (!node.catchClause || token() === 87) {
-                parseExpected(87);
-                node.finallyBlock = parseBlock(false);
+            var node = createNode(230 /* TryStatement */);
+            parseExpected(102 /* TryKeyword */);
+            node.tryBlock = parseBlock(/*ignoreMissingOpenBrace*/ false);
+            node.catchClause = token() === 74 /* CatchKeyword */ ? parseCatchClause() : undefined;
+            // If we don't have a catch clause, then we must have a finally clause.  Try to parse
+            // one out no matter what.
+            if (!node.catchClause || token() === 87 /* FinallyKeyword */) {
+                parseExpected(87 /* FinallyKeyword */);
+                node.finallyBlock = parseBlock(/*ignoreMissingOpenBrace*/ false);
             }
             return finishNode(node);
         }
         function parseCatchClause() {
-            var result = createNode(269);
-            parseExpected(74);
-            if (parseOptional(19)) {
+            var result = createNode(269 /* CatchClause */);
+            parseExpected(74 /* CatchKeyword */);
+            if (parseOptional(19 /* OpenParenToken */)) {
                 result.variableDeclaration = parseVariableDeclaration();
-                parseExpected(20);
+                parseExpected(20 /* CloseParenToken */);
             }
             else {
+                // Keep shape of node to avoid degrading performance.
                 result.variableDeclaration = undefined;
             }
-            result.block = parseBlock(false);
+            result.block = parseBlock(/*ignoreMissingOpenBrace*/ false);
             return finishNode(result);
         }
         function parseDebuggerStatement() {
-            var node = createNode(231);
-            parseExpected(78);
+            var node = createNode(231 /* DebuggerStatement */);
+            parseExpected(78 /* DebuggerKeyword */);
             parseSemicolon();
             return finishNode(node);
         }
         function parseExpressionOrLabeledStatement() {
-            var node = createNodeWithJSDoc(0);
+            // Avoiding having to do the lookahead for a labeled statement by just trying to parse
+            // out an expression, seeing if it is identifier and then seeing if it is followed by
+            // a colon.
+            var node = createNodeWithJSDoc(0 /* Unknown */);
             var expression = allowInAnd(parseExpression);
-            if (expression.kind === 71 && parseOptional(56)) {
-                node.kind = 228;
+            if (expression.kind === 71 /* Identifier */ && parseOptional(56 /* ColonToken */)) {
+                node.kind = 228 /* LabeledStatement */;
                 node.label = expression;
                 node.statement = parseStatement();
             }
             else {
-                node.kind = 216;
+                node.kind = 216 /* ExpressionStatement */;
                 node.expression = expression;
                 parseSemicolon();
             }
@@ -15419,60 +19471,82 @@ var ts;
         }
         function nextTokenIsClassKeywordOnSameLine() {
             nextToken();
-            return token() === 75 && !scanner.hasPrecedingLineBreak();
+            return token() === 75 /* ClassKeyword */ && !scanner.hasPrecedingLineBreak();
         }
         function nextTokenIsFunctionKeywordOnSameLine() {
             nextToken();
-            return token() === 89 && !scanner.hasPrecedingLineBreak();
+            return token() === 89 /* FunctionKeyword */ && !scanner.hasPrecedingLineBreak();
         }
         function nextTokenIsIdentifierOrKeywordOrLiteralOnSameLine() {
             nextToken();
-            return (ts.tokenIsIdentifierOrKeyword(token()) || token() === 8 || token() === 9) && !scanner.hasPrecedingLineBreak();
+            return (ts.tokenIsIdentifierOrKeyword(token()) || token() === 8 /* NumericLiteral */ || token() === 9 /* StringLiteral */) && !scanner.hasPrecedingLineBreak();
         }
         function isDeclaration() {
             while (true) {
                 switch (token()) {
-                    case 104:
-                    case 110:
-                    case 76:
-                    case 89:
-                    case 75:
-                    case 83:
+                    case 104 /* VarKeyword */:
+                    case 110 /* LetKeyword */:
+                    case 76 /* ConstKeyword */:
+                    case 89 /* FunctionKeyword */:
+                    case 75 /* ClassKeyword */:
+                    case 83 /* EnumKeyword */:
                         return true;
-                    case 109:
-                    case 139:
+                    // 'declare', 'module', 'namespace', 'interface'* and 'type' are all legal JavaScript identifiers;
+                    // however, an identifier cannot be followed by another identifier on the same line. This is what we
+                    // count on to parse out the respective declarations. For instance, we exploit this to say that
+                    //
+                    //    namespace n
+                    //
+                    // can be none other than the beginning of a namespace declaration, but need to respect that JavaScript sees
+                    //
+                    //    namespace
+                    //    n
+                    //
+                    // as the identifier 'namespace' on one line followed by the identifier 'n' on another.
+                    // We need to look one token ahead to see if it permissible to try parsing a declaration.
+                    //
+                    // *Note*: 'interface' is actually a strict mode reserved word. So while
+                    //
+                    //   "use strict"
+                    //   interface
+                    //   I {}
+                    //
+                    // could be legal, it would add complexity for very little gain.
+                    case 109 /* InterfaceKeyword */:
+                    case 139 /* TypeKeyword */:
                         return nextTokenIsIdentifierOnSameLine();
-                    case 129:
-                    case 130:
+                    case 129 /* ModuleKeyword */:
+                    case 130 /* NamespaceKeyword */:
                         return nextTokenIsIdentifierOrStringLiteralOnSameLine();
-                    case 117:
-                    case 120:
-                    case 124:
-                    case 112:
-                    case 113:
-                    case 114:
-                    case 132:
+                    case 117 /* AbstractKeyword */:
+                    case 120 /* AsyncKeyword */:
+                    case 124 /* DeclareKeyword */:
+                    case 112 /* PrivateKeyword */:
+                    case 113 /* ProtectedKeyword */:
+                    case 114 /* PublicKeyword */:
+                    case 132 /* ReadonlyKeyword */:
                         nextToken();
+                        // ASI takes effect for this modifier.
                         if (scanner.hasPrecedingLineBreak()) {
                             return false;
                         }
                         continue;
-                    case 144:
+                    case 144 /* GlobalKeyword */:
                         nextToken();
-                        return token() === 17 || token() === 71 || token() === 84;
-                    case 91:
+                        return token() === 17 /* OpenBraceToken */ || token() === 71 /* Identifier */ || token() === 84 /* ExportKeyword */;
+                    case 91 /* ImportKeyword */:
                         nextToken();
-                        return token() === 9 || token() === 39 ||
-                            token() === 17 || ts.tokenIsIdentifierOrKeyword(token());
-                    case 84:
+                        return token() === 9 /* StringLiteral */ || token() === 39 /* AsteriskToken */ ||
+                            token() === 17 /* OpenBraceToken */ || ts.tokenIsIdentifierOrKeyword(token());
+                    case 84 /* ExportKeyword */:
                         nextToken();
-                        if (token() === 58 || token() === 39 ||
-                            token() === 17 || token() === 79 ||
-                            token() === 118) {
+                        if (token() === 58 /* EqualsToken */ || token() === 39 /* AsteriskToken */ ||
+                            token() === 17 /* OpenBraceToken */ || token() === 79 /* DefaultKeyword */ ||
+                            token() === 118 /* AsKeyword */) {
                             return true;
                         }
                         continue;
-                    case 115:
+                    case 115 /* StaticKeyword */:
                         nextToken();
                         continue;
                     default:
@@ -15485,47 +19559,52 @@ var ts;
         }
         function isStartOfStatement() {
             switch (token()) {
-                case 57:
-                case 25:
-                case 17:
-                case 104:
-                case 110:
-                case 89:
-                case 75:
-                case 83:
-                case 90:
-                case 81:
-                case 106:
-                case 88:
-                case 77:
-                case 72:
-                case 96:
-                case 107:
-                case 98:
-                case 100:
-                case 102:
-                case 78:
-                case 74:
-                case 87:
+                case 57 /* AtToken */:
+                case 25 /* SemicolonToken */:
+                case 17 /* OpenBraceToken */:
+                case 104 /* VarKeyword */:
+                case 110 /* LetKeyword */:
+                case 89 /* FunctionKeyword */:
+                case 75 /* ClassKeyword */:
+                case 83 /* EnumKeyword */:
+                case 90 /* IfKeyword */:
+                case 81 /* DoKeyword */:
+                case 106 /* WhileKeyword */:
+                case 88 /* ForKeyword */:
+                case 77 /* ContinueKeyword */:
+                case 72 /* BreakKeyword */:
+                case 96 /* ReturnKeyword */:
+                case 107 /* WithKeyword */:
+                case 98 /* SwitchKeyword */:
+                case 100 /* ThrowKeyword */:
+                case 102 /* TryKeyword */:
+                case 78 /* DebuggerKeyword */:
+                // 'catch' and 'finally' do not actually indicate that the code is part of a statement,
+                // however, we say they are here so that we may gracefully parse them and error later.
+                case 74 /* CatchKeyword */:
+                case 87 /* FinallyKeyword */:
                     return true;
-                case 91:
+                case 91 /* ImportKeyword */:
                     return isStartOfDeclaration() || lookAhead(nextTokenIsOpenParenOrLessThanOrDot);
-                case 76:
-                case 84:
+                case 76 /* ConstKeyword */:
+                case 84 /* ExportKeyword */:
                     return isStartOfDeclaration();
-                case 120:
-                case 124:
-                case 109:
-                case 129:
-                case 130:
-                case 139:
-                case 144:
+                case 120 /* AsyncKeyword */:
+                case 124 /* DeclareKeyword */:
+                case 109 /* InterfaceKeyword */:
+                case 129 /* ModuleKeyword */:
+                case 130 /* NamespaceKeyword */:
+                case 139 /* TypeKeyword */:
+                case 144 /* GlobalKeyword */:
+                    // When these don't start a declaration, they're an identifier in an expression statement
                     return true;
-                case 114:
-                case 112:
-                case 113:
-                case 115:
-                case 132:
+                case 114 /* PublicKeyword */:
+                case 112 /* PrivateKeyword */:
+                case 113 /* ProtectedKeyword */:
+                case 115 /* StaticKeyword */:
+                case 132 /* ReadonlyKeyword */:
+                    // When these don't start a declaration, they may be the start of a class member if an identifier
+                    // immediately follows. Otherwise they're an identifier in an expression statement.
                     return isStartOfDeclaration() || !lookAhead(nextTokenIsIdentifierOrKeywordOnSameLine);
                 default:
                     return isStartOfExpression();
@@ -15533,73 +19612,76 @@ var ts;
         }
         function nextTokenIsIdentifierOrStartOfDestructuring() {
             nextToken();
-            return isIdentifier() || token() === 17 || token() === 21;
+            return isIdentifier() || token() === 17 /* OpenBraceToken */ || token() === 21 /* OpenBracketToken */;
         }
         function isLetDeclaration() {
+            // In ES6 'let' always starts a lexical declaration if followed by an identifier or {
+            // or [.
             return lookAhead(nextTokenIsIdentifierOrStartOfDestructuring);
         }
         function parseStatement() {
             switch (token()) {
-                case 25:
+                case 25 /* SemicolonToken */:
                     return parseEmptyStatement();
-                case 17:
-                    return parseBlock(false);
-                case 104:
-                    return parseVariableStatement(createNodeWithJSDoc(232));
-                case 110:
+                case 17 /* OpenBraceToken */:
+                    return parseBlock(/*ignoreMissingOpenBrace*/ false);
+                case 104 /* VarKeyword */:
+                    return parseVariableStatement(createNodeWithJSDoc(232 /* VariableDeclaration */));
+                case 110 /* LetKeyword */:
                     if (isLetDeclaration()) {
-                        return parseVariableStatement(createNodeWithJSDoc(232));
+                        return parseVariableStatement(createNodeWithJSDoc(232 /* VariableDeclaration */));
                     }
                     break;
-                case 89:
-                    return parseFunctionDeclaration(createNodeWithJSDoc(234));
-                case 75:
-                    return parseClassDeclaration(createNodeWithJSDoc(235));
-                case 90:
+                case 89 /* FunctionKeyword */:
+                    return parseFunctionDeclaration(createNodeWithJSDoc(234 /* FunctionDeclaration */));
+                case 75 /* ClassKeyword */:
+                    return parseClassDeclaration(createNodeWithJSDoc(235 /* ClassDeclaration */));
+                case 90 /* IfKeyword */:
                     return parseIfStatement();
-                case 81:
+                case 81 /* DoKeyword */:
                     return parseDoStatement();
-                case 106:
+                case 106 /* WhileKeyword */:
                     return parseWhileStatement();
-                case 88:
+                case 88 /* ForKeyword */:
                     return parseForOrForInOrForOfStatement();
-                case 77:
-                    return parseBreakOrContinueStatement(223);
-                case 72:
-                    return parseBreakOrContinueStatement(224);
-                case 96:
+                case 77 /* ContinueKeyword */:
+                    return parseBreakOrContinueStatement(223 /* ContinueStatement */);
+                case 72 /* BreakKeyword */:
+                    return parseBreakOrContinueStatement(224 /* BreakStatement */);
+                case 96 /* ReturnKeyword */:
                     return parseReturnStatement();
-                case 107:
+                case 107 /* WithKeyword */:
                     return parseWithStatement();
-                case 98:
+                case 98 /* SwitchKeyword */:
                     return parseSwitchStatement();
-                case 100:
+                case 100 /* ThrowKeyword */:
                     return parseThrowStatement();
-                case 102:
-                case 74:
-                case 87:
+                case 102 /* TryKeyword */:
+                // Include 'catch' and 'finally' for error recovery.
+                case 74 /* CatchKeyword */:
+                case 87 /* FinallyKeyword */:
                     return parseTryStatement();
-                case 78:
+                case 78 /* DebuggerKeyword */:
                     return parseDebuggerStatement();
-                case 57:
+                case 57 /* AtToken */:
                     return parseDeclaration();
-                case 120:
-                case 109:
-                case 139:
-                case 129:
-                case 130:
-                case 124:
-                case 76:
-                case 83:
-                case 84:
-                case 91:
-                case 112:
-                case 113:
-                case 114:
-                case 117:
-                case 115:
-                case 132:
-                case 144:
+                case 120 /* AsyncKeyword */:
+                case 109 /* InterfaceKeyword */:
+                case 139 /* TypeKeyword */:
+                case 129 /* ModuleKeyword */:
+                case 130 /* NamespaceKeyword */:
+                case 124 /* DeclareKeyword */:
+                case 76 /* ConstKeyword */:
+                case 83 /* EnumKeyword */:
+                case 84 /* ExportKeyword */:
+                case 91 /* ImportKeyword */:
+                case 112 /* PrivateKeyword */:
+                case 113 /* ProtectedKeyword */:
+                case 114 /* PublicKeyword */:
+                case 117 /* AbstractKeyword */:
+                case 115 /* StaticKeyword */:
+                case 132 /* ReadonlyKeyword */:
+                case 144 /* GlobalKeyword */:
                     if (isStartOfDeclaration()) {
                         return parseDeclaration();
                     }
@@ -15608,18 +19690,18 @@ var ts;
             return parseExpressionOrLabeledStatement();
         }
         function isDeclareModifier(modifier) {
-            return modifier.kind === 124;
+            return modifier.kind === 124 /* DeclareKeyword */;
         }
         function parseDeclaration() {
-            var node = createNodeWithJSDoc(0);
+            var node = createNodeWithJSDoc(0 /* Unknown */);
             node.decorators = parseDecorators();
             node.modifiers = parseModifiers();
             if (ts.some(node.modifiers, isDeclareModifier)) {
                 for (var _i = 0, _a = node.modifiers; _i < _a.length; _i++) {
                     var m = _a[_i];
-                    m.flags |= 4194304;
+                    m.flags |= 4194304 /* Ambient */;
                 }
-                return doInsideOfContext(4194304, function () { return parseDeclarationWorker(node); });
+                return doInsideOfContext(4194304 /* Ambient */, function () { return parseDeclarationWorker(node); });
             }
             else {
                 return parseDeclarationWorker(node);
@@ -15627,79 +19709,82 @@ var ts;
         }
         function parseDeclarationWorker(node) {
             switch (token()) {
-                case 104:
-                case 110:
-                case 76:
+                case 104 /* VarKeyword */:
+                case 110 /* LetKeyword */:
+                case 76 /* ConstKeyword */:
                     return parseVariableStatement(node);
-                case 89:
+                case 89 /* FunctionKeyword */:
                     return parseFunctionDeclaration(node);
-                case 75:
+                case 75 /* ClassKeyword */:
                     return parseClassDeclaration(node);
-                case 109:
+                case 109 /* InterfaceKeyword */:
                     return parseInterfaceDeclaration(node);
-                case 139:
+                case 139 /* TypeKeyword */:
                     return parseTypeAliasDeclaration(node);
-                case 83:
+                case 83 /* EnumKeyword */:
                     return parseEnumDeclaration(node);
-                case 144:
-                case 129:
-                case 130:
+                case 144 /* GlobalKeyword */:
+                case 129 /* ModuleKeyword */:
+                case 130 /* NamespaceKeyword */:
                     return parseModuleDeclaration(node);
-                case 91:
+                case 91 /* ImportKeyword */:
                     return parseImportDeclarationOrImportEqualsDeclaration(node);
-                case 84:
+                case 84 /* ExportKeyword */:
                     nextToken();
                     switch (token()) {
-                        case 79:
-                        case 58:
+                        case 79 /* DefaultKeyword */:
+                        case 58 /* EqualsToken */:
                             return parseExportAssignment(node);
-                        case 118:
+                        case 118 /* AsKeyword */:
                             return parseNamespaceExportDeclaration(node);
                         default:
                             return parseExportDeclaration(node);
                     }
                 default:
                     if (node.decorators || node.modifiers) {
-                        var missing = createMissingNode(253, true, ts.Diagnostics.Declaration_expected);
+                        // We reached this point because we encountered decorators and/or modifiers and assumed a declaration
+                        // would follow. For recovery and error reporting purposes, return an incomplete declaration.
+                        var missing = createMissingNode(253 /* MissingDeclaration */, /*reportAtCurrentPosition*/ true, ts.Diagnostics.Declaration_expected);
                         missing.pos = node.pos;
                         missing.decorators = node.decorators;
                         missing.modifiers = node.modifiers;
                         return finishNode(missing);
                     }
-                    return undefined;
+                    return undefined; // TODO: GH#18217
             }
         }
         function nextTokenIsIdentifierOrStringLiteralOnSameLine() {
             nextToken();
-            return !scanner.hasPrecedingLineBreak() && (isIdentifier() || token() === 9);
+            return !scanner.hasPrecedingLineBreak() && (isIdentifier() || token() === 9 /* StringLiteral */);
         }
         function parseFunctionBlockOrSemicolon(flags, diagnosticMessage) {
-            if (token() !== 17 && canParseSemicolon()) {
+            if (token() !== 17 /* OpenBraceToken */ && canParseSemicolon()) {
                 parseSemicolon();
                 return;
             }
             return parseFunctionBlock(flags, diagnosticMessage);
         }
+        // DECLARATIONS
         function parseArrayBindingElement() {
-            if (token() === 26) {
-                return createNode(206);
+            if (token() === 26 /* CommaToken */) {
+                return createNode(206 /* OmittedExpression */);
             }
-            var node = createNode(182);
-            node.dotDotDotToken = parseOptionalToken(24);
+            var node = createNode(182 /* BindingElement */);
+            node.dotDotDotToken = parseOptionalToken(24 /* DotDotDotToken */);
             node.name = parseIdentifierOrPattern();
             node.initializer = parseInitializer();
             return finishNode(node);
         }
         function parseObjectBindingElement() {
-            var node = createNode(182);
-            node.dotDotDotToken = parseOptionalToken(24);
+            var node = createNode(182 /* BindingElement */);
+            node.dotDotDotToken = parseOptionalToken(24 /* DotDotDotToken */);
             var tokenIsIdentifier = isIdentifier();
             var propertyName = parsePropertyName();
-            if (tokenIsIdentifier && token() !== 56) {
+            if (tokenIsIdentifier && token() !== 56 /* ColonToken */) {
                 node.name = propertyName;
             }
             else {
-                parseExpected(56);
+                parseExpected(56 /* ColonToken */);
                 node.propertyName = propertyName;
                 node.name = parseIdentifierOrPattern();
             }
@@ -15707,39 +19792,39 @@ var ts;
             return finishNode(node);
         }
         function parseObjectBindingPattern() {
-            var node = createNode(180);
-            parseExpected(17);
-            node.elements = parseDelimitedList(9, parseObjectBindingElement);
-            parseExpected(18);
+            var node = createNode(180 /* ObjectBindingPattern */);
+            parseExpected(17 /* OpenBraceToken */);
+            node.elements = parseDelimitedList(9 /* ObjectBindingElements */, parseObjectBindingElement);
+            parseExpected(18 /* CloseBraceToken */);
             return finishNode(node);
         }
         function parseArrayBindingPattern() {
-            var node = createNode(181);
-            parseExpected(21);
-            node.elements = parseDelimitedList(10, parseArrayBindingElement);
-            parseExpected(22);
+            var node = createNode(181 /* ArrayBindingPattern */);
+            parseExpected(21 /* OpenBracketToken */);
+            node.elements = parseDelimitedList(10 /* ArrayBindingElements */, parseArrayBindingElement);
+            parseExpected(22 /* CloseBracketToken */);
             return finishNode(node);
         }
         function isIdentifierOrPattern() {
-            return token() === 17 || token() === 21 || isIdentifier();
+            return token() === 17 /* OpenBraceToken */ || token() === 21 /* OpenBracketToken */ || isIdentifier();
         }
         function parseIdentifierOrPattern() {
-            if (token() === 21) {
+            if (token() === 21 /* OpenBracketToken */) {
                 return parseArrayBindingPattern();
             }
-            if (token() === 17) {
+            if (token() === 17 /* OpenBraceToken */) {
                 return parseObjectBindingPattern();
             }
             return parseIdentifier();
         }
         function parseVariableDeclarationAllowExclamation() {
-            return parseVariableDeclaration(true);
+            return parseVariableDeclaration(/*allowExclamation*/ true);
         }
         function parseVariableDeclaration(allowExclamation) {
-            var node = createNode(232);
+            var node = createNode(232 /* VariableDeclaration */);
             node.name = parseIdentifierOrPattern();
-            if (allowExclamation && node.name.kind === 71 &&
-                token() === 51 && !scanner.hasPrecedingLineBreak()) {
+            if (allowExclamation && node.name.kind === 71 /* Identifier */ &&
+                token() === 51 /* ExclamationToken */ && !scanner.hasPrecedingLineBreak()) {
                 node.exclamationToken = parseTokenNode();
             }
             node.type = parseTypeAnnotation();
@@ -15749,84 +19834,104 @@ var ts;
             return finishNode(node);
         }
         function parseVariableDeclarationList(inForStatementInitializer) {
-            var node = createNode(233);
+            var node = createNode(233 /* VariableDeclarationList */);
             switch (token()) {
-                case 104:
+                case 104 /* VarKeyword */:
                     break;
-                case 110:
-                    node.flags |= 1;
+                case 110 /* LetKeyword */:
+                    node.flags |= 1 /* Let */;
                     break;
-                case 76:
-                    node.flags |= 2;
+                case 76 /* ConstKeyword */:
+                    node.flags |= 2 /* Const */;
                     break;
                 default:
                     ts.Debug.fail();
             }
             nextToken();
-            if (token() === 145 && lookAhead(canFollowContextualOfKeyword)) {
+            // The user may have written the following:
+            //
+            //    for (let of X) { }
+            //
+            // In this case, we want to parse an empty declaration list, and then parse 'of'
+            // as a keyword. The reason this is not automatic is that 'of' is a valid identifier.
+            // So we need to look ahead to determine if 'of' should be treated as a keyword in
+            // this context.
+            // The checker will then give an error that there is an empty declaration list.
+            if (token() === 145 /* OfKeyword */ && lookAhead(canFollowContextualOfKeyword)) {
                 node.declarations = createMissingList();
             }
             else {
                 var savedDisallowIn = inDisallowInContext();
                 setDisallowInContext(inForStatementInitializer);
-                node.declarations = parseDelimitedList(8, inForStatementInitializer ? parseVariableDeclaration : parseVariableDeclarationAllowExclamation);
+                node.declarations = parseDelimitedList(8 /* VariableDeclarations */, inForStatementInitializer ? parseVariableDeclaration : parseVariableDeclarationAllowExclamation);
                 setDisallowInContext(savedDisallowIn);
             }
             return finishNode(node);
         }
         function canFollowContextualOfKeyword() {
-            return nextTokenIsIdentifier() && nextToken() === 20;
+            return nextTokenIsIdentifier() && nextToken() === 20 /* CloseParenToken */;
         }
         function parseVariableStatement(node) {
-            node.kind = 214;
-            node.declarationList = parseVariableDeclarationList(false);
+            node.kind = 214 /* VariableStatement */;
+            node.declarationList = parseVariableDeclarationList(/*inForStatementInitializer*/ false);
             parseSemicolon();
             return finishNode(node);
         }
         function parseFunctionDeclaration(node) {
-            node.kind = 234;
-            parseExpected(89);
-            node.asteriskToken = parseOptionalToken(39);
-            node.name = ts.hasModifier(node, 512) ? parseOptionalIdentifier() : parseIdentifier();
-            var isGenerator = node.asteriskToken ? 1 : 0;
-            var isAsync = ts.hasModifier(node, 256) ? 2 : 0;
-            fillSignature(56, isGenerator | isAsync, node);
+            node.kind = 234 /* FunctionDeclaration */;
+            parseExpected(89 /* FunctionKeyword */);
+            node.asteriskToken = parseOptionalToken(39 /* AsteriskToken */);
+            node.name = ts.hasModifier(node, 512 /* Default */) ? parseOptionalIdentifier() : parseIdentifier();
+            var isGenerator = node.asteriskToken ? 1 /* Yield */ : 0 /* None */;
+            var isAsync = ts.hasModifier(node, 256 /* Async */) ? 2 /* Await */ : 0 /* None */;
+            fillSignature(56 /* ColonToken */, isGenerator | isAsync, node);
             node.body = parseFunctionBlockOrSemicolon(isGenerator | isAsync, ts.Diagnostics.or_expected);
             return finishNode(node);
         }
         function parseConstructorDeclaration(node) {
-            node.kind = 155;
-            parseExpected(123);
-            fillSignature(56, 0, node);
-            node.body = parseFunctionBlockOrSemicolon(0, ts.Diagnostics.or_expected);
+            node.kind = 155 /* Constructor */;
+            parseExpected(123 /* ConstructorKeyword */);
+            fillSignature(56 /* ColonToken */, 0 /* None */, node);
+            node.body = parseFunctionBlockOrSemicolon(0 /* None */, ts.Diagnostics.or_expected);
             return finishNode(node);
         }
         function parseMethodDeclaration(node, asteriskToken, diagnosticMessage) {
-            node.kind = 154;
+            node.kind = 154 /* MethodDeclaration */;
             node.asteriskToken = asteriskToken;
-            var isGenerator = asteriskToken ? 1 : 0;
-            var isAsync = ts.hasModifier(node, 256) ? 2 : 0;
-            fillSignature(56, isGenerator | isAsync, node);
+            var isGenerator = asteriskToken ? 1 /* Yield */ : 0 /* None */;
+            var isAsync = ts.hasModifier(node, 256 /* Async */) ? 2 /* Await */ : 0 /* None */;
+            fillSignature(56 /* ColonToken */, isGenerator | isAsync, node);
             node.body = parseFunctionBlockOrSemicolon(isGenerator | isAsync, diagnosticMessage);
             return finishNode(node);
         }
         function parsePropertyDeclaration(node) {
-            node.kind = 152;
-            if (!node.questionToken && token() === 51 && !scanner.hasPrecedingLineBreak()) {
+            node.kind = 152 /* PropertyDeclaration */;
+            if (!node.questionToken && token() === 51 /* ExclamationToken */ && !scanner.hasPrecedingLineBreak()) {
                 node.exclamationToken = parseTokenNode();
             }
             node.type = parseTypeAnnotation();
-            node.initializer = ts.hasModifier(node, 32)
+            // For instance properties specifically, since they are evaluated inside the constructor,
+            // we do *not * want to parse yield expressions, so we specifically turn the yield context
+            // off. The grammar would look something like this:
+            //
+            //    MemberVariableDeclaration[Yield]:
+            //        AccessibilityModifier_opt PropertyName TypeAnnotation_opt Initializer_opt[In];
+            //        AccessibilityModifier_opt static_opt PropertyName TypeAnnotation_opt Initializer_opt[In, ?Yield];
+            //
+            // The checker may still error in the static case to explicitly disallow the yield expression.
+            node.initializer = ts.hasModifier(node, 32 /* Static */)
                 ? allowInAnd(parseInitializer)
-                : doOutsideOfContext(4096 | 2048, parseInitializer);
+                : doOutsideOfContext(4096 /* YieldContext */ | 2048 /* DisallowInContext */, parseInitializer);
             parseSemicolon();
             return finishNode(node);
         }
         function parsePropertyOrMethodDeclaration(node) {
-            var asteriskToken = parseOptionalToken(39);
+            var asteriskToken = parseOptionalToken(39 /* AsteriskToken */);
             node.name = parsePropertyName();
-            node.questionToken = parseOptionalToken(55);
-            if (asteriskToken || token() === 19 || token() === 27) {
+            // Note: this is not legal as per the grammar.  But we allow it in the parser and
+            // report an error in the grammar checker.
+            node.questionToken = parseOptionalToken(55 /* QuestionToken */);
+            if (asteriskToken || token() === 19 /* OpenParenToken */ || token() === 27 /* LessThanToken */) {
                 return parseMethodDeclaration(node, asteriskToken, ts.Diagnostics.or_expected);
             }
             return parsePropertyDeclaration(node);
@@ -15834,45 +19939,64 @@ var ts;
         function parseAccessorDeclaration(node, kind) {
             node.kind = kind;
             node.name = parsePropertyName();
-            fillSignature(56, 0, node);
-            node.body = parseFunctionBlockOrSemicolon(0);
+            fillSignature(56 /* ColonToken */, 0 /* None */, node);
+            node.body = parseFunctionBlockOrSemicolon(0 /* None */);
             return finishNode(node);
         }
         function isClassMemberStart() {
             var idToken;
-            if (token() === 57) {
+            if (token() === 57 /* AtToken */) {
                 return true;
             }
+            // Eat up all modifiers, but hold on to the last one in case it is actually an identifier.
             while (ts.isModifierKind(token())) {
                 idToken = token();
+                // If the idToken is a class modifier (protected, private, public, and static), it is
+                // certain that we are starting to parse class member. This allows better error recovery
+                // Example:
+                //      public foo() ...     // true
+                //      public @dec blah ... // true; we will then report an error later
+                //      export public ...    // true; we will then report an error later
                 if (ts.isClassMemberModifier(idToken)) {
                     return true;
                 }
                 nextToken();
             }
-            if (token() === 39) {
+            if (token() === 39 /* AsteriskToken */) {
                 return true;
             }
+            // Try to get the first property-like token following all modifiers.
+            // This can either be an identifier or the 'get' or 'set' keywords.
             if (isLiteralPropertyName()) {
                 idToken = token();
                 nextToken();
             }
-            if (token() === 21) {
+            // Index signatures and computed properties are class members; we can parse.
+            if (token() === 21 /* OpenBracketToken */) {
                 return true;
             }
+            // If we were able to get any potential identifier...
             if (idToken !== undefined) {
-                if (!ts.isKeyword(idToken) || idToken === 136 || idToken === 125) {
+                // If we have a non-keyword identifier, or if we have an accessor, then it's safe to parse.
+                if (!ts.isKeyword(idToken) || idToken === 136 /* SetKeyword */ || idToken === 125 /* GetKeyword */) {
                     return true;
                 }
+                // If it *is* a keyword, but not an accessor, check a little farther along
+                // to see if it should actually be parsed as a class member.
                 switch (token()) {
-                    case 19:
-                    case 27:
-                    case 51:
-                    case 56:
-                    case 58:
-                    case 55:
+                    case 19 /* OpenParenToken */: // Method declaration
+                    case 27 /* LessThanToken */: // Generic Method declaration
+                    case 51 /* ExclamationToken */: // Non-null assertion on property name
+                    case 56 /* ColonToken */: // Type Annotation for declaration
+                    case 58 /* EqualsToken */: // Initializer for declaration
+                    case 55 /* QuestionToken */: // Not valid, but permitted so that it gets caught later on.
                         return true;
                     default:
+                        // Covers
+                        //  - Semicolons     (declaration termination)
+                        //  - Closing braces (end-of-class, must be declaration)
+                        //  - End-of-files   (not valid, but permitted so that it gets caught later on)
+                        //  - Line-breaks    (enabling *automatic semicolon insertion*)
                         return canParseSemicolon();
                 }
             }
@@ -15883,23 +20007,32 @@ var ts;
             var listPos = getNodePos();
             while (true) {
                 var decoratorStart = getNodePos();
-                if (!parseOptional(57)) {
+                if (!parseOptional(57 /* AtToken */)) {
                     break;
                 }
-                var decorator = createNode(150, decoratorStart);
+                var decorator = createNode(150 /* Decorator */, decoratorStart);
                 decorator.expression = doInDecoratorContext(parseLeftHandSideExpressionOrHigher);
                 finishNode(decorator);
                 (list || (list = [])).push(decorator);
             }
             return list && createNodeArray(list, listPos);
         }
+        /*
+         * There are situations in which a modifier like 'const' will appear unexpectedly, such as on a class member.
+         * In those situations, if we are entirely sure that 'const' is not valid on its own (such as when ASI takes effect
+         * and turns it into a standalone declaration), then it is better to parse it and report an error later.
+         *
+         * In such situations, 'permitInvalidConstAsModifier' should be set to true.
+         */
         function parseModifiers(permitInvalidConstAsModifier) {
             var list;
             var listPos = getNodePos();
             while (true) {
                 var modifierStart = scanner.getStartPos();
                 var modifierKind = token();
-                if (token() === 76 && permitInvalidConstAsModifier) {
+                if (token() === 76 /* ConstKeyword */ && permitInvalidConstAsModifier) {
+                    // We need to ensure that any subsequent modifiers appear on the same line
+                    // so that when 'const' is a standalone declaration, we don't issue an error.
                     if (!tryParse(nextTokenIsOnSameLineAndCanFollowModifier)) {
                         break;
                     }
@@ -15916,7 +20049,7 @@ var ts;
         }
         function parseModifiersForArrowFunction() {
             var modifiers;
-            if (token() === 120) {
+            if (token() === 120 /* AsyncKeyword */) {
                 var modifierStart = scanner.getStartPos();
                 var modifierKind = token();
                 nextToken();
@@ -15926,54 +20059,60 @@ var ts;
             return modifiers;
         }
         function parseClassElement() {
-            if (token() === 25) {
-                var result = createNode(212);
+            if (token() === 25 /* SemicolonToken */) {
+                var result = createNode(212 /* SemicolonClassElement */);
                 nextToken();
                 return finishNode(result);
             }
-            var node = createNodeWithJSDoc(0);
+            var node = createNodeWithJSDoc(0 /* Unknown */);
             node.decorators = parseDecorators();
-            node.modifiers = parseModifiers(true);
-            if (parseContextualModifier(125)) {
-                return parseAccessorDeclaration(node, 156);
+            node.modifiers = parseModifiers(/*permitInvalidConstAsModifier*/ true);
+            if (parseContextualModifier(125 /* GetKeyword */)) {
+                return parseAccessorDeclaration(node, 156 /* GetAccessor */);
             }
-            if (parseContextualModifier(136)) {
-                return parseAccessorDeclaration(node, 157);
+            if (parseContextualModifier(136 /* SetKeyword */)) {
+                return parseAccessorDeclaration(node, 157 /* SetAccessor */);
             }
-            if (token() === 123) {
+            if (token() === 123 /* ConstructorKeyword */) {
                 return parseConstructorDeclaration(node);
             }
             if (isIndexSignature()) {
                 return parseIndexSignatureDeclaration(node);
             }
+            // It is very important that we check this *after* checking indexers because
+            // the [ token can start an index signature or a computed property name
             if (ts.tokenIsIdentifierOrKeyword(token()) ||
-                token() === 9 ||
-                token() === 8 ||
-                token() === 39 ||
-                token() === 21) {
+                token() === 9 /* StringLiteral */ ||
+                token() === 8 /* NumericLiteral */ ||
+                token() === 39 /* AsteriskToken */ ||
+                token() === 21 /* OpenBracketToken */) {
                 return parsePropertyOrMethodDeclaration(node);
             }
             if (node.decorators || node.modifiers) {
-                node.name = createMissingNode(71, true, ts.Diagnostics.Declaration_expected);
+                // treat this as a property declaration with a missing name.
+                node.name = createMissingNode(71 /* Identifier */, /*reportAtCurrentPosition*/ true, ts.Diagnostics.Declaration_expected);
                 return parsePropertyDeclaration(node);
             }
+            // 'isClassMemberStart' should have hinted not to attempt parsing.
             return ts.Debug.fail("Should not have attempted to parse class member declaration.");
         }
         function parseClassExpression() {
-            return parseClassDeclarationOrExpression(createNodeWithJSDoc(0), 205);
+            return parseClassDeclarationOrExpression(createNodeWithJSDoc(0 /* Unknown */), 205 /* ClassExpression */);
         }
         function parseClassDeclaration(node) {
-            return parseClassDeclarationOrExpression(node, 235);
+            return parseClassDeclarationOrExpression(node, 235 /* ClassDeclaration */);
         }
         function parseClassDeclarationOrExpression(node, kind) {
             node.kind = kind;
-            parseExpected(75);
+            parseExpected(75 /* ClassKeyword */);
             node.name = parseNameOfClassDeclarationOrExpression();
             node.typeParameters = parseTypeParameters();
             node.heritageClauses = parseHeritageClauses();
-            if (parseExpected(17)) {
+            if (parseExpected(17 /* OpenBraceToken */)) {
+                // ClassTail[Yield,Await] : (Modified) See 14.5
+                //      ClassHeritage[?Yield,?Await]opt { ClassBody[?Yield,?Await]opt }
                 node.members = parseClassMembers();
-                parseExpected(18);
+                parseExpected(18 /* CloseBraceToken */);
             }
             else {
                 node.members = createMissingList();
@@ -15981,48 +20120,55 @@ var ts;
             return finishNode(node);
         }
         function parseNameOfClassDeclarationOrExpression() {
+            // implements is a future reserved word so
+            // 'class implements' might mean either
+            // - class expression with omitted name, 'implements' starts heritage clause
+            // - class with name 'implements'
+            // 'isImplementsClause' helps to disambiguate between these two cases
             return isIdentifier() && !isImplementsClause()
                 ? parseIdentifier()
                 : undefined;
         }
         function isImplementsClause() {
-            return token() === 108 && lookAhead(nextTokenIsIdentifierOrKeyword);
+            return token() === 108 /* ImplementsKeyword */ && lookAhead(nextTokenIsIdentifierOrKeyword);
         }
         function parseHeritageClauses() {
+            // ClassTail[Yield,Await] : (Modified) See 14.5
+            //      ClassHeritage[?Yield,?Await]opt { ClassBody[?Yield,?Await]opt }
             if (isHeritageClause()) {
-                return parseList(21, parseHeritageClause);
+                return parseList(21 /* HeritageClauses */, parseHeritageClause);
             }
             return undefined;
         }
         function parseHeritageClause() {
             var tok = token();
-            ts.Debug.assert(tok === 85 || tok === 108);
-            var node = createNode(268);
+            ts.Debug.assert(tok === 85 /* ExtendsKeyword */ || tok === 108 /* ImplementsKeyword */); // isListElement() should ensure this.
+            var node = createNode(268 /* HeritageClause */);
             node.token = tok;
             nextToken();
-            node.types = parseDelimitedList(7, parseExpressionWithTypeArguments);
+            node.types = parseDelimitedList(7 /* HeritageClauseElement */, parseExpressionWithTypeArguments);
             return finishNode(node);
         }
         function parseExpressionWithTypeArguments() {
-            var node = createNode(207);
+            var node = createNode(207 /* ExpressionWithTypeArguments */);
             node.expression = parseLeftHandSideExpressionOrHigher();
             node.typeArguments = tryParseTypeArguments();
             return finishNode(node);
         }
         function tryParseTypeArguments() {
-            return token() === 27
-                ? parseBracketedList(19, parseType, 27, 29)
+            return token() === 27 /* LessThanToken */
+                ? parseBracketedList(19 /* TypeArguments */, parseType, 27 /* LessThanToken */, 29 /* GreaterThanToken */)
                 : undefined;
         }
         function isHeritageClause() {
-            return token() === 85 || token() === 108;
+            return token() === 85 /* ExtendsKeyword */ || token() === 108 /* ImplementsKeyword */;
         }
         function parseClassMembers() {
-            return parseList(5, parseClassElement);
+            return parseList(5 /* ClassMembers */, parseClassElement);
         }
         function parseInterfaceDeclaration(node) {
-            node.kind = 236;
-            parseExpected(109);
+            node.kind = 236 /* InterfaceDeclaration */;
+            parseExpected(109 /* InterfaceKeyword */);
             node.name = parseIdentifier();
             node.typeParameters = parseTypeParameters();
             node.heritageClauses = parseHeritageClauses();
@@ -16030,28 +20176,32 @@ var ts;
             return finishNode(node);
         }
         function parseTypeAliasDeclaration(node) {
-            node.kind = 237;
-            parseExpected(139);
+            node.kind = 237 /* TypeAliasDeclaration */;
+            parseExpected(139 /* TypeKeyword */);
             node.name = parseIdentifier();
             node.typeParameters = parseTypeParameters();
-            parseExpected(58);
+            parseExpected(58 /* EqualsToken */);
             node.type = parseType();
             parseSemicolon();
             return finishNode(node);
         }
+        // In an ambient declaration, the grammar only allows integer literals as initializers.
+        // In a non-ambient declaration, the grammar allows uninitialized members only in a
+        // ConstantEnumMemberSection, which starts at the beginning of an enum declaration
+        // or any time an integer literal initializer is encountered.
         function parseEnumMember() {
-            var node = createNodeWithJSDoc(273);
+            var node = createNodeWithJSDoc(273 /* EnumMember */);
             node.name = parsePropertyName();
             node.initializer = allowInAnd(parseInitializer);
             return finishNode(node);
         }
         function parseEnumDeclaration(node) {
-            node.kind = 238;
-            parseExpected(83);
+            node.kind = 238 /* EnumDeclaration */;
+            parseExpected(83 /* EnumKeyword */);
             node.name = parseIdentifier();
-            if (parseExpected(17)) {
-                node.members = parseDelimitedList(6, parseEnumMember);
-                parseExpected(18);
+            if (parseExpected(17 /* OpenBraceToken */)) {
+                node.members = parseDelimitedList(6 /* EnumMembers */, parseEnumMember);
+                parseExpected(18 /* CloseBraceToken */);
             }
             else {
                 node.members = createMissingList();
@@ -16059,10 +20209,10 @@ var ts;
             return finishNode(node);
         }
         function parseModuleBlock() {
-            var node = createNode(240);
-            if (parseExpected(17)) {
-                node.statements = parseList(1, parseStatement);
-                parseExpected(18);
+            var node = createNode(240 /* ModuleBlock */);
+            if (parseExpected(17 /* OpenBraceToken */)) {
+                node.statements = parseList(1 /* BlockStatements */, parseStatement);
+                parseExpected(18 /* CloseBraceToken */);
             }
             else {
                 node.statements = createMissingList();
@@ -16070,26 +20220,29 @@ var ts;
             return finishNode(node);
         }
         function parseModuleOrNamespaceDeclaration(node, flags) {
-            node.kind = 239;
-            var namespaceFlag = flags & 16;
+            node.kind = 239 /* ModuleDeclaration */;
+            // If we are parsing a dotted namespace name, we want to
+            // propagate the 'Namespace' flag across the names if set.
+            var namespaceFlag = flags & 16 /* Namespace */;
             node.flags |= flags;
             node.name = parseIdentifier();
-            node.body = parseOptional(23)
-                ? parseModuleOrNamespaceDeclaration(createNode(0), 4 | namespaceFlag)
+            node.body = parseOptional(23 /* DotToken */)
+                ? parseModuleOrNamespaceDeclaration(createNode(0 /* Unknown */), 4 /* NestedNamespace */ | namespaceFlag)
                 : parseModuleBlock();
             return finishNode(node);
         }
         function parseAmbientExternalModuleDeclaration(node) {
-            node.kind = 239;
-            if (token() === 144) {
+            node.kind = 239 /* ModuleDeclaration */;
+            if (token() === 144 /* GlobalKeyword */) {
+                // parse 'global' as name of global scope augmentation
                 node.name = parseIdentifier();
-                node.flags |= 512;
+                node.flags |= 512 /* GlobalAugmentation */;
             }
             else {
                 node.name = parseLiteralNode();
                 node.name.text = internIdentifier(node.name.text);
             }
-            if (token() === 17) {
+            if (token() === 17 /* OpenBraceToken */) {
                 node.body = parseModuleBlock();
             }
             else {
@@ -16099,128 +20252,161 @@ var ts;
         }
         function parseModuleDeclaration(node) {
             var flags = 0;
-            if (token() === 144) {
+            if (token() === 144 /* GlobalKeyword */) {
+                // global augmentation
                 return parseAmbientExternalModuleDeclaration(node);
             }
-            else if (parseOptional(130)) {
-                flags |= 16;
+            else if (parseOptional(130 /* NamespaceKeyword */)) {
+                flags |= 16 /* Namespace */;
             }
             else {
-                parseExpected(129);
-                if (token() === 9) {
+                parseExpected(129 /* ModuleKeyword */);
+                if (token() === 9 /* StringLiteral */) {
                     return parseAmbientExternalModuleDeclaration(node);
                 }
             }
             return parseModuleOrNamespaceDeclaration(node, flags);
         }
         function isExternalModuleReference() {
-            return token() === 133 &&
+            return token() === 133 /* RequireKeyword */ &&
                 lookAhead(nextTokenIsOpenParen);
         }
         function nextTokenIsOpenParen() {
-            return nextToken() === 19;
+            return nextToken() === 19 /* OpenParenToken */;
         }
         function nextTokenIsSlash() {
-            return nextToken() === 41;
+            return nextToken() === 41 /* SlashToken */;
         }
         function parseNamespaceExportDeclaration(node) {
-            node.kind = 242;
-            parseExpected(118);
-            parseExpected(130);
+            node.kind = 242 /* NamespaceExportDeclaration */;
+            parseExpected(118 /* AsKeyword */);
+            parseExpected(130 /* NamespaceKeyword */);
             node.name = parseIdentifier();
             parseSemicolon();
             return finishNode(node);
         }
         function parseImportDeclarationOrImportEqualsDeclaration(node) {
-            parseExpected(91);
+            parseExpected(91 /* ImportKeyword */);
             var afterImportPos = scanner.getStartPos();
             var identifier;
             if (isIdentifier()) {
                 identifier = parseIdentifier();
-                if (token() !== 26 && token() !== 143) {
+                if (token() !== 26 /* CommaToken */ && token() !== 143 /* FromKeyword */) {
                     return parseImportEqualsDeclaration(node, identifier);
                 }
             }
-            node.kind = 244;
-            if (identifier ||
-                token() === 39 ||
-                token() === 17) {
+            // Import statement
+            node.kind = 244 /* ImportDeclaration */;
+            // ImportDeclaration:
+            //  import ImportClause from ModuleSpecifier ;
+            //  import ModuleSpecifier;
+            if (identifier || // import id
+                token() === 39 /* AsteriskToken */ || // import *
+                token() === 17 /* OpenBraceToken */) { // import {
                 node.importClause = parseImportClause(identifier, afterImportPos);
-                parseExpected(143);
+                parseExpected(143 /* FromKeyword */);
             }
             node.moduleSpecifier = parseModuleSpecifier();
             parseSemicolon();
             return finishNode(node);
         }
         function parseImportEqualsDeclaration(node, identifier) {
-            node.kind = 243;
+            node.kind = 243 /* ImportEqualsDeclaration */;
             node.name = identifier;
-            parseExpected(58);
+            parseExpected(58 /* EqualsToken */);
             node.moduleReference = parseModuleReference();
             parseSemicolon();
             return finishNode(node);
         }
         function parseImportClause(identifier, fullStart) {
-            var importClause = createNode(245, fullStart);
+            // ImportClause:
+            //  ImportedDefaultBinding
+            //  NameSpaceImport
+            //  NamedImports
+            //  ImportedDefaultBinding, NameSpaceImport
+            //  ImportedDefaultBinding, NamedImports
+            var importClause = createNode(245 /* ImportClause */, fullStart);
             if (identifier) {
+                // ImportedDefaultBinding:
+                //  ImportedBinding
                 importClause.name = identifier;
             }
+            // If there was no default import or if there is comma token after default import
+            // parse namespace or named imports
             if (!importClause.name ||
-                parseOptional(26)) {
-                importClause.namedBindings = token() === 39 ? parseNamespaceImport() : parseNamedImportsOrExports(247);
+                parseOptional(26 /* CommaToken */)) {
+                importClause.namedBindings = token() === 39 /* AsteriskToken */ ? parseNamespaceImport() : parseNamedImportsOrExports(247 /* NamedImports */);
             }
             return finishNode(importClause);
         }
         function parseModuleReference() {
             return isExternalModuleReference()
                 ? parseExternalModuleReference()
-                : parseEntityName(false);
+                : parseEntityName(/*allowReservedWords*/ false);
         }
         function parseExternalModuleReference() {
-            var node = createNode(254);
-            parseExpected(133);
-            parseExpected(19);
+            var node = createNode(254 /* ExternalModuleReference */);
+            parseExpected(133 /* RequireKeyword */);
+            parseExpected(19 /* OpenParenToken */);
             node.expression = parseModuleSpecifier();
-            parseExpected(20);
+            parseExpected(20 /* CloseParenToken */);
             return finishNode(node);
         }
         function parseModuleSpecifier() {
-            if (token() === 9) {
+            if (token() === 9 /* StringLiteral */) {
                 var result = parseLiteralNode();
                 result.text = internIdentifier(result.text);
                 return result;
             }
             else {
+                // We allow arbitrary expressions here, even though the grammar only allows string
+                // literals.  We check to ensure that it is only a string literal later in the grammar
+                // check pass.
                 return parseExpression();
             }
         }
         function parseNamespaceImport() {
-            var namespaceImport = createNode(246);
-            parseExpected(39);
-            parseExpected(118);
+            // NameSpaceImport:
+            //  * as ImportedBinding
+            var namespaceImport = createNode(246 /* NamespaceImport */);
+            parseExpected(39 /* AsteriskToken */);
+            parseExpected(118 /* AsKeyword */);
             namespaceImport.name = parseIdentifier();
             return finishNode(namespaceImport);
         }
         function parseNamedImportsOrExports(kind) {
             var node = createNode(kind);
-            node.elements = parseBracketedList(22, kind === 247 ? parseImportSpecifier : parseExportSpecifier, 17, 18);
+            // NamedImports:
+            //  { }
+            //  { ImportsList }
+            //  { ImportsList, }
+            // ImportsList:
+            //  ImportSpecifier
+            //  ImportsList, ImportSpecifier
+            node.elements = parseBracketedList(22 /* ImportOrExportSpecifiers */, kind === 247 /* NamedImports */ ? parseImportSpecifier : parseExportSpecifier, 17 /* OpenBraceToken */, 18 /* CloseBraceToken */);
             return finishNode(node);
         }
         function parseExportSpecifier() {
-            return parseImportOrExportSpecifier(252);
+            return parseImportOrExportSpecifier(252 /* ExportSpecifier */);
         }
         function parseImportSpecifier() {
-            return parseImportOrExportSpecifier(248);
+            return parseImportOrExportSpecifier(248 /* ImportSpecifier */);
         }
         function parseImportOrExportSpecifier(kind) {
             var node = createNode(kind);
+            // ImportSpecifier:
+            //   BindingIdentifier
+            //   IdentifierName as BindingIdentifier
+            // ExportSpecifier:
+            //   IdentifierName
+            //   IdentifierName as IdentifierName
             var checkIdentifierIsKeyword = ts.isKeyword(token()) && !isIdentifier();
             var checkIdentifierStart = scanner.getTokenPos();
             var checkIdentifierEnd = scanner.getTextPos();
             var identifierName = parseIdentifierName();
-            if (token() === 118) {
+            if (token() === 118 /* AsKeyword */) {
                 node.propertyName = identifierName;
-                parseExpected(118);
+                parseExpected(118 /* AsKeyword */);
                 checkIdentifierIsKeyword = ts.isKeyword(token()) && !isIdentifier();
                 checkIdentifierStart = scanner.getTokenPos();
                 checkIdentifierEnd = scanner.getTextPos();
@@ -16229,21 +20415,24 @@ var ts;
             else {
                 node.name = identifierName;
             }
-            if (kind === 248 && checkIdentifierIsKeyword) {
+            if (kind === 248 /* ImportSpecifier */ && checkIdentifierIsKeyword) {
                 parseErrorAt(checkIdentifierStart, checkIdentifierEnd, ts.Diagnostics.Identifier_expected);
             }
             return finishNode(node);
         }
         function parseExportDeclaration(node) {
-            node.kind = 250;
-            if (parseOptional(39)) {
-                parseExpected(143);
+            node.kind = 250 /* ExportDeclaration */;
+            if (parseOptional(39 /* AsteriskToken */)) {
+                parseExpected(143 /* FromKeyword */);
                 node.moduleSpecifier = parseModuleSpecifier();
             }
             else {
-                node.exportClause = parseNamedImportsOrExports(251);
-                if (token() === 143 || (token() === 9 && !scanner.hasPrecedingLineBreak())) {
-                    parseExpected(143);
+                node.exportClause = parseNamedImportsOrExports(251 /* NamedExports */);
+                // It is not uncommon to accidentally omit the 'from' keyword. Additionally, in editing scenarios,
+                // the 'from' keyword can be parsed as a named export when the export clause is unterminated (i.e. `export { from "moduleName";`)
+                // If we don't have a 'from' keyword, see if we have a string literal such that ASI won't take effect.
+                if (token() === 143 /* FromKeyword */ || (token() === 9 /* StringLiteral */ && !scanner.hasPrecedingLineBreak())) {
+                    parseExpected(143 /* FromKeyword */);
                     node.moduleSpecifier = parseModuleSpecifier();
                 }
             }
@@ -16251,33 +20440,35 @@ var ts;
             return finishNode(node);
         }
         function parseExportAssignment(node) {
-            node.kind = 249;
-            if (parseOptional(58)) {
+            node.kind = 249 /* ExportAssignment */;
+            if (parseOptional(58 /* EqualsToken */)) {
                 node.isExportEquals = true;
             }
             else {
-                parseExpected(79);
+                parseExpected(79 /* DefaultKeyword */);
             }
             node.expression = parseAssignmentExpressionOrHigher();
             parseSemicolon();
             return finishNode(node);
         }
         function setExternalModuleIndicator(sourceFile) {
+            // Try to use the first top-level import/export when available, then
+            // fall back to looking for an 'import.meta' somewhere in the tree if necessary.
             sourceFile.externalModuleIndicator =
                 ts.forEach(sourceFile.statements, isAnExternalModuleIndicatorNode) ||
                     getImportMetaIfNecessary(sourceFile);
         }
         function isAnExternalModuleIndicatorNode(node) {
-            return ts.hasModifier(node, 1)
-                || node.kind === 243 && node.moduleReference.kind === 254
-                || node.kind === 244
-                || node.kind === 249
-                || node.kind === 250
+            return ts.hasModifier(node, 1 /* Export */)
+                || node.kind === 243 /* ImportEqualsDeclaration */ && node.moduleReference.kind === 254 /* ExternalModuleReference */
+                || node.kind === 244 /* ImportDeclaration */
+                || node.kind === 249 /* ExportAssignment */
+                || node.kind === 250 /* ExportDeclaration */
                 ? node
                 : undefined;
         }
         function getImportMetaIfNecessary(sourceFile) {
-            return sourceFile.flags & 1048576 ?
+            return sourceFile.flags & 1048576 /* PossiblyContainsImportMeta */ ?
                 walkTreeForExternalModuleIndicators(sourceFile) :
                 undefined;
         }
@@ -16285,13 +20476,46 @@ var ts;
             return isImportMeta(node) ? node : forEachChild(node, walkTreeForExternalModuleIndicators);
         }
         function isImportMeta(node) {
-            return ts.isMetaProperty(node) && node.keywordToken === 91 && node.name.escapedText === "meta";
+            return ts.isMetaProperty(node) && node.keywordToken === 91 /* ImportKeyword */ && node.name.escapedText === "meta";
         }
+        var ParsingContext;
+        (function (ParsingContext) {
+            ParsingContext[ParsingContext["SourceElements"] = 0] = "SourceElements";
+            ParsingContext[ParsingContext["BlockStatements"] = 1] = "BlockStatements";
+            ParsingContext[ParsingContext["SwitchClauses"] = 2] = "SwitchClauses";
+            ParsingContext[ParsingContext["SwitchClauseStatements"] = 3] = "SwitchClauseStatements";
+            ParsingContext[ParsingContext["TypeMembers"] = 4] = "TypeMembers";
+            ParsingContext[ParsingContext["ClassMembers"] = 5] = "ClassMembers";
+            ParsingContext[ParsingContext["EnumMembers"] = 6] = "EnumMembers";
+            ParsingContext[ParsingContext["HeritageClauseElement"] = 7] = "HeritageClauseElement";
+            ParsingContext[ParsingContext["VariableDeclarations"] = 8] = "VariableDeclarations";
+            ParsingContext[ParsingContext["ObjectBindingElements"] = 9] = "ObjectBindingElements";
+            ParsingContext[ParsingContext["ArrayBindingElements"] = 10] = "ArrayBindingElements";
+            ParsingContext[ParsingContext["ArgumentExpressions"] = 11] = "ArgumentExpressions";
+            ParsingContext[ParsingContext["ObjectLiteralMembers"] = 12] = "ObjectLiteralMembers";
+            ParsingContext[ParsingContext["JsxAttributes"] = 13] = "JsxAttributes";
+            ParsingContext[ParsingContext["JsxChildren"] = 14] = "JsxChildren";
+            ParsingContext[ParsingContext["ArrayLiteralMembers"] = 15] = "ArrayLiteralMembers";
+            ParsingContext[ParsingContext["Parameters"] = 16] = "Parameters";
+            ParsingContext[ParsingContext["RestProperties"] = 17] = "RestProperties";
+            ParsingContext[ParsingContext["TypeParameters"] = 18] = "TypeParameters";
+            ParsingContext[ParsingContext["TypeArguments"] = 19] = "TypeArguments";
+            ParsingContext[ParsingContext["TupleElementTypes"] = 20] = "TupleElementTypes";
+            ParsingContext[ParsingContext["HeritageClauses"] = 21] = "HeritageClauses";
+            ParsingContext[ParsingContext["ImportOrExportSpecifiers"] = 22] = "ImportOrExportSpecifiers";
+            ParsingContext[ParsingContext["Count"] = 23] = "Count"; // Number of parsing contexts
+        })(ParsingContext || (ParsingContext = {}));
+        var Tristate;
+        (function (Tristate) {
+            Tristate[Tristate["False"] = 0] = "False";
+            Tristate[Tristate["True"] = 1] = "True";
+            Tristate[Tristate["Unknown"] = 2] = "Unknown";
+        })(Tristate || (Tristate = {}));
         var JSDocParser;
         (function (JSDocParser) {
             function parseJSDocTypeExpressionForTests(content, start, length) {
-                initializeState(content, 6, undefined, 1);
-                sourceFile = createSourceFile("file.js", 6, 1, false);
+                initializeState(content, 6 /* Latest */, /*_syntaxCursor:*/ undefined, 1 /* JS */);
+                sourceFile = createSourceFile("file.js", 6 /* Latest */, 1 /* JS */, /*isDeclarationFile*/ false);
                 scanner.setText(content, start, length);
                 currentToken = scanner.scan();
                 var jsDocTypeExpression = parseJSDocTypeExpression();
@@ -16300,20 +20524,21 @@ var ts;
                 return jsDocTypeExpression ? { jsDocTypeExpression: jsDocTypeExpression, diagnostics: diagnostics } : undefined;
             }
             JSDocParser.parseJSDocTypeExpressionForTests = parseJSDocTypeExpressionForTests;
+            // Parses out a JSDoc type expression.
             function parseJSDocTypeExpression(mayOmitBraces) {
-                var result = createNode(278, scanner.getTokenPos());
-                var hasBrace = (mayOmitBraces ? parseOptional : parseExpected)(17);
-                result.type = doInsideOfContext(2097152, parseJSDocType);
+                var result = createNode(278 /* JSDocTypeExpression */, scanner.getTokenPos());
+                var hasBrace = (mayOmitBraces ? parseOptional : parseExpected)(17 /* OpenBraceToken */);
+                result.type = doInsideOfContext(2097152 /* JSDoc */, parseJSDocType);
                 if (!mayOmitBraces || hasBrace) {
-                    parseExpected(18);
+                    parseExpected(18 /* CloseBraceToken */);
                 }
                 fixupParentReferences(result);
                 return finishNode(result);
             }
             JSDocParser.parseJSDocTypeExpression = parseJSDocTypeExpression;
             function parseIsolatedJSDocComment(content, start, length) {
-                initializeState(content, 6, undefined, 1);
-                sourceFile = { languageVariant: 0, text: content };
+                initializeState(content, 6 /* Latest */, /*_syntaxCursor:*/ undefined, 1 /* JS */);
+                sourceFile = { languageVariant: 0 /* Standard */, text: content }; // tslint:disable-line no-object-literal-type-assertion
                 var jsDoc = parseJSDocCommentWorker(start, length);
                 var diagnostics = parseDiagnostics;
                 clearState();
@@ -16329,7 +20554,7 @@ var ts;
                 if (comment) {
                     comment.parent = parent;
                 }
-                if (contextFlags & 65536) {
+                if (contextFlags & 65536 /* JavaScriptFile */) {
                     if (!sourceFile.jsDocDiagnostics) {
                         sourceFile.jsDocDiagnostics = [];
                     }
@@ -16341,6 +20566,18 @@ var ts;
                 return comment;
             }
             JSDocParser.parseJSDocComment = parseJSDocComment;
+            var JSDocState;
+            (function (JSDocState) {
+                JSDocState[JSDocState["BeginningOfLine"] = 0] = "BeginningOfLine";
+                JSDocState[JSDocState["SawAsterisk"] = 1] = "SawAsterisk";
+                JSDocState[JSDocState["SavingComments"] = 2] = "SavingComments";
+            })(JSDocState || (JSDocState = {}));
+            var PropertyLikeParse;
+            (function (PropertyLikeParse) {
+                PropertyLikeParse[PropertyLikeParse["Property"] = 1] = "Property";
+                PropertyLikeParse[PropertyLikeParse["Parameter"] = 2] = "Parameter";
+                PropertyLikeParse[PropertyLikeParse["CallbackParameter"] = 4] = "CallbackParameter";
+            })(PropertyLikeParse || (PropertyLikeParse = {}));
             function parseJSDocCommentWorker(start, length) {
                 if (start === void 0) { start = 0; }
                 var content = sourceText;
@@ -16354,12 +20591,17 @@ var ts;
                 var tagsEnd;
                 var comments = [];
                 var result;
+                // Check for /** (JSDoc opening part)
                 if (!isJSDocLikeText(content, start)) {
                     return result;
                 }
+                // + 3 for leading /**, - 5 in total for /** */
                 scanner.scanRange(start + 3, length - 5, function () {
-                    var state = 1;
+                    // Initially we can parse out a tag.  We also have seen a starting asterisk.
+                    // This is so that /** * @type */ doesn't parse.
+                    var state = 1 /* SawAsterisk */;
                     var margin;
+                    // + 4 for leading '/** '
                     var indent = start - Math.max(content.lastIndexOf("\n", start), 0) + 4;
                     function pushComment(text) {
                         if (!margin) {
@@ -16369,19 +20611,22 @@ var ts;
                         indent += text.length;
                     }
                     nextJSDocToken();
-                    while (parseOptionalJsdoc(5))
+                    while (parseOptionalJsdoc(5 /* WhitespaceTrivia */))
                         ;
-                    if (parseOptionalJsdoc(4)) {
-                        state = 0;
+                    if (parseOptionalJsdoc(4 /* NewLineTrivia */)) {
+                        state = 0 /* BeginningOfLine */;
                         indent = 0;
                     }
                     loop: while (true) {
                         switch (token()) {
-                            case 57:
-                                if (state === 0 || state === 1) {
+                            case 57 /* AtToken */:
+                                if (state === 0 /* BeginningOfLine */ || state === 1 /* SawAsterisk */) {
                                     removeTrailingNewlines(comments);
                                     addTag(parseTag(indent));
-                                    state = 0;
+                                    // NOTE: According to usejsdoc.org, a tag goes to end of line, except the last tag.
+                                    // Real-world comments may break this rule, so "BeginningOfLine" will not be a real line beginning
+                                    // for malformed examples like `/** @param {string} x @returns {number} the length */`
+                                    state = 0 /* BeginningOfLine */;
                                     margin = undefined;
                                     indent++;
                                 }
@@ -16389,29 +20634,35 @@ var ts;
                                     pushComment(scanner.getTokenText());
                                 }
                                 break;
-                            case 4:
+                            case 4 /* NewLineTrivia */:
                                 comments.push(scanner.getTokenText());
-                                state = 0;
+                                state = 0 /* BeginningOfLine */;
                                 indent = 0;
                                 break;
-                            case 39:
+                            case 39 /* AsteriskToken */:
                                 var asterisk = scanner.getTokenText();
-                                if (state === 1 || state === 2) {
-                                    state = 2;
+                                if (state === 1 /* SawAsterisk */ || state === 2 /* SavingComments */) {
+                                    // If we've already seen an asterisk, then we can no longer parse a tag on this line
+                                    state = 2 /* SavingComments */;
                                     pushComment(asterisk);
                                 }
                                 else {
-                                    state = 1;
+                                    // Ignore the first asterisk on a line
+                                    state = 1 /* SawAsterisk */;
                                     indent += asterisk.length;
                                 }
                                 break;
-                            case 71:
+                            case 71 /* Identifier */:
+                                // Anything else is doc comment text. We just save it. Because it
+                                // wasn't a tag, we can no longer parse a tag on this line until we hit the next
+                                // line break.
                                 pushComment(scanner.getTokenText());
-                                state = 2;
+                                state = 2 /* SavingComments */;
                                 break;
-                            case 5:
+                            case 5 /* WhitespaceTrivia */:
+                                // only collect whitespace if we're already saving comments or have just crossed the comment indent margin
                                 var whitespace = scanner.getTokenText();
-                                if (state === 2) {
+                                if (state === 2 /* SavingComments */) {
                                     comments.push(whitespace);
                                 }
                                 else if (margin !== undefined && indent + whitespace.length > margin) {
@@ -16419,10 +20670,11 @@ var ts;
                                 }
                                 indent += whitespace.length;
                                 break;
-                            case 1:
+                            case 1 /* EndOfFileToken */:
                                 break loop;
                             default:
-                                state = 2;
+                                // anything other than whitespace or asterisk at the beginning of the line starts the comment text
+                                state = 2 /* SavingComments */;
                                 pushComment(scanner.getTokenText());
                                 break;
                         }
@@ -16444,92 +20696,83 @@ var ts;
                     }
                 }
                 function createJSDocComment() {
-                    var result = createNode(286, start);
+                    var result = createNode(286 /* JSDocComment */, start);
                     result.tags = tags && createNodeArray(tags, tagsPos, tagsEnd);
                     result.comment = comments.length ? comments.join("") : undefined;
                     return finishNode(result, end);
                 }
                 function isNextNonwhitespaceTokenEndOfFile() {
+                    // We must use infinite lookahead, as there could be any number of newlines :(
                     while (true) {
                         nextJSDocToken();
-                        if (token() === 1) {
+                        if (token() === 1 /* EndOfFileToken */) {
                             return true;
                         }
-                        if (!(token() === 5 || token() === 4)) {
+                        if (!(token() === 5 /* WhitespaceTrivia */ || token() === 4 /* NewLineTrivia */)) {
                             return false;
                         }
                     }
                 }
                 function skipWhitespace() {
-                    if (token() === 5 || token() === 4) {
+                    if (token() === 5 /* WhitespaceTrivia */ || token() === 4 /* NewLineTrivia */) {
                         if (lookAhead(isNextNonwhitespaceTokenEndOfFile)) {
-                            return;
+                            return; // Don't skip whitespace prior to EoF (or end of comment) - that shouldn't be included in any node's range
                         }
                     }
-                    while (token() === 5 || token() === 4) {
+                    while (token() === 5 /* WhitespaceTrivia */ || token() === 4 /* NewLineTrivia */) {
                         nextJSDocToken();
                     }
                 }
                 function parseTag(indent) {
-                    ts.Debug.assert(token() === 57);
-                    var atToken = createNode(57, scanner.getTokenPos());
+                    ts.Debug.assert(token() === 57 /* AtToken */);
+                    var atToken = createNode(57 /* AtToken */, scanner.getTokenPos());
                     atToken.end = scanner.getTextPos();
                     nextJSDocToken();
                     var tagName = parseJSDocIdentifierName();
                     skipWhitespace();
-                    if (!tagName) {
-                        return;
-                    }
                     var tag;
-                    if (tagName) {
-                        switch (tagName.escapedText) {
-                            case "augments":
-                            case "extends":
-                                tag = parseAugmentsTag(atToken, tagName);
-                                break;
-                            case "class":
-                            case "constructor":
-                                tag = parseClassTag(atToken, tagName);
-                                break;
-                            case "arg":
-                            case "argument":
-                            case "param":
-                                return parseParameterOrPropertyTag(atToken, tagName, 2, indent);
-                            case "return":
-                            case "returns":
-                                tag = parseReturnTag(atToken, tagName);
-                                break;
-                            case "template":
-                                tag = parseTemplateTag(atToken, tagName);
-                                break;
-                            case "type":
-                                tag = parseTypeTag(atToken, tagName);
-                                break;
-                            case "typedef":
-                                tag = parseTypedefTag(atToken, tagName, indent);
-                                break;
-                            case "callback":
-                                tag = parseCallbackTag(atToken, tagName, indent);
-                                break;
-                            default:
-                                tag = parseUnknownTag(atToken, tagName);
-                                break;
-                        }
-                    }
-                    else {
-                        tag = parseUnknownTag(atToken, tagName);
-                    }
-                    if (!tag) {
-                        return;
+                    switch (tagName.escapedText) {
+                        case "augments":
+                        case "extends":
+                            tag = parseAugmentsTag(atToken, tagName);
+                            break;
+                        case "class":
+                        case "constructor":
+                            tag = parseClassTag(atToken, tagName);
+                            break;
+                        case "arg":
+                        case "argument":
+                        case "param":
+                            return parseParameterOrPropertyTag(atToken, tagName, 2 /* Parameter */, indent);
+                        case "return":
+                        case "returns":
+                            tag = parseReturnTag(atToken, tagName);
+                            break;
+                        case "template":
+                            tag = parseTemplateTag(atToken, tagName);
+                            break;
+                        case "type":
+                            tag = parseTypeTag(atToken, tagName);
+                            break;
+                        case "typedef":
+                            tag = parseTypedefTag(atToken, tagName, indent);
+                            break;
+                        case "callback":
+                            tag = parseCallbackTag(atToken, tagName, indent);
+                            break;
+                        default:
+                            tag = parseUnknownTag(atToken, tagName);
+                            break;
                     }
                     if (!tag.comment) {
+                        // some tags, like typedef and callback, have already parsed their comments earlier
                         tag.comment = parseTagComments(indent + tag.end - tag.pos);
                     }
                     return tag;
                 }
                 function parseTagComments(indent) {
                     var comments = [];
-                    var state = 0;
+                    var state = 0 /* BeginningOfLine */;
                     var margin;
                     function pushComment(text) {
                         if (!margin) {
@@ -16541,37 +20784,43 @@ var ts;
                     var tok = token();
                     loop: while (true) {
                         switch (tok) {
-                            case 4:
-                                if (state >= 1) {
-                                    state = 0;
+                            case 4 /* NewLineTrivia */:
+                                if (state >= 1 /* SawAsterisk */) {
+                                    state = 0 /* BeginningOfLine */;
                                     comments.push(scanner.getTokenText());
                                 }
                                 indent = 0;
                                 break;
-                            case 57:
+                            case 57 /* AtToken */:
                                 scanner.setTextPos(scanner.getTextPos() - 1);
-                            case 1:
+                            // falls through
+                            case 1 /* EndOfFileToken */:
+                                // Done
                                 break loop;
-                            case 5:
-                                if (state === 2) {
+                            case 5 /* WhitespaceTrivia */:
+                                if (state === 2 /* SavingComments */) {
                                     pushComment(scanner.getTokenText());
                                 }
                                 else {
                                     var whitespace = scanner.getTokenText();
+                                    // if the whitespace crosses the margin, take only the whitespace that passes the margin
                                     if (margin !== undefined && indent + whitespace.length > margin) {
                                         comments.push(whitespace.slice(margin - indent - 1));
                                     }
                                     indent += whitespace.length;
                                 }
                                 break;
-                            case 39:
-                                if (state === 0) {
-                                    state = 1;
+                            case 39 /* AsteriskToken */:
+                                if (state === 0 /* BeginningOfLine */) {
+                                    // leading asterisks start recording on the *next* (non-whitespace) token
+                                    state = 1 /* SawAsterisk */;
                                     indent += 1;
                                     break;
                                 }
+                            // record the * as a comment
+                            // falls through
                             default:
-                                state = 2;
+                                state = 2 /* SavingComments */; // leading identifiers start recording as well
                                 pushComment(scanner.getTokenText());
                                 break;
                         }
@@ -16582,7 +20831,7 @@ var ts;
                     return comments.length === 0 ? undefined : comments.join("");
                 }
                 function parseUnknownTag(atToken, tagName) {
-                    var result = createNode(289, atToken.pos);
+                    var result = createNode(289 /* JSDocTag */, atToken.pos);
                     result.atToken = atToken;
                     result.tagName = tagName;
                     return finishNode(result);
@@ -16602,28 +20851,31 @@ var ts;
                 }
                 function tryParseTypeExpression() {
                     skipWhitespace();
-                    return token() === 17 ? parseJSDocTypeExpression() : undefined;
+                    return token() === 17 /* OpenBraceToken */ ? parseJSDocTypeExpression() : undefined;
                 }
                 function parseBracketNameInPropertyAndParamTag() {
-                    if (token() === 13) {
-                        return { name: createIdentifier(true), isBracketed: false };
+                    if (token() === 13 /* NoSubstitutionTemplateLiteral */) {
+                        // a markdown-quoted name: `arg` is not legal jsdoc, but occurs in the wild
+                        return { name: createIdentifier(/*isIdentifier*/ true), isBracketed: false };
                     }
-                    var isBracketed = parseOptional(21);
+                    // Looking for something like '[foo]', 'foo', '[foo.bar]' or 'foo.bar'
+                    var isBracketed = parseOptional(21 /* OpenBracketToken */);
                     var name = parseJSDocEntityName();
                     if (isBracketed) {
                         skipWhitespace();
-                        if (parseOptionalToken(58)) {
+                        // May have an optional default, e.g. '[foo = 42]'
+                        if (parseOptionalToken(58 /* EqualsToken */)) {
                             parseExpression();
                         }
-                        parseExpected(22);
+                        parseExpected(22 /* CloseBracketToken */);
                     }
                     return { name: name, isBracketed: isBracketed };
                 }
                 function isObjectOrObjectArrayTypeReference(node) {
                     switch (node.kind) {
-                        case 135:
+                        case 135 /* ObjectKeyword */:
                             return true;
-                        case 167:
+                        case 167 /* ArrayType */:
                             return isObjectOrObjectArrayTypeReference(node.elementType);
                         default:
                             return ts.isTypeReferenceNode(node) && ts.isIdentifier(node.typeName) && node.typeName.escapedText === "Object";
@@ -16638,13 +20890,13 @@ var ts;
                     if (isNameFirst) {
                         typeExpression = tryParseTypeExpression();
                     }
-                    var result = target === 1 ?
-                        createNode(298, atToken.pos) :
-                        createNode(293, atToken.pos);
+                    var result = target === 1 /* Property */ ?
+                        createNode(298 /* JSDocPropertyTag */, atToken.pos) :
+                        createNode(293 /* JSDocParameterTag */, atToken.pos);
                     var comment;
                     if (indent !== undefined)
                         comment = parseTagComments(indent + scanner.getStartPos() - atToken.pos);
-                    var nestedTypeLiteral = target !== 4 && parseNestedTypeLiteral(typeExpression, name, target);
+                    var nestedTypeLiteral = target !== 4 /* CallbackParameter */ && parseNestedTypeLiteral(typeExpression, name, target);
                     if (nestedTypeLiteral) {
                         typeExpression = nestedTypeLiteral;
                         isNameFirst = true;
@@ -16660,20 +20912,20 @@ var ts;
                 }
                 function parseNestedTypeLiteral(typeExpression, name, target) {
                     if (typeExpression && isObjectOrObjectArrayTypeReference(typeExpression.type)) {
-                        var typeLiteralExpression = createNode(278, scanner.getTokenPos());
+                        var typeLiteralExpression = createNode(278 /* JSDocTypeExpression */, scanner.getTokenPos());
                         var child = void 0;
                         var jsdocTypeLiteral = void 0;
                         var start_2 = scanner.getStartPos();
                         var children = void 0;
                         while (child = tryParse(function () { return parseChildParameterOrPropertyTag(target, name); })) {
-                            if (child.kind === 293 || child.kind === 298) {
+                            if (child.kind === 293 /* JSDocParameterTag */ || child.kind === 298 /* JSDocPropertyTag */) {
                                 children = ts.append(children, child);
                             }
                         }
                         if (children) {
-                            jsdocTypeLiteral = createNode(287, start_2);
+                            jsdocTypeLiteral = createNode(287 /* JSDocTypeLiteral */, start_2);
                             jsdocTypeLiteral.jsDocPropertyTags = children;
-                            if (typeExpression.type.kind === 167) {
+                            if (typeExpression.type.kind === 167 /* ArrayType */) {
                                 jsdocTypeLiteral.isArrayType = true;
                             }
                             typeLiteralExpression.type = finishNode(jsdocTypeLiteral);
@@ -16682,47 +20934,47 @@ var ts;
                     }
                 }
                 function parseReturnTag(atToken, tagName) {
-                    if (ts.forEach(tags, function (t) { return t.kind === 294; })) {
+                    if (ts.forEach(tags, function (t) { return t.kind === 294 /* JSDocReturnTag */; })) {
                         parseErrorAt(tagName.pos, scanner.getTokenPos(), ts.Diagnostics._0_tag_already_specified, tagName.escapedText);
                     }
-                    var result = createNode(294, atToken.pos);
+                    var result = createNode(294 /* JSDocReturnTag */, atToken.pos);
                     result.atToken = atToken;
                     result.tagName = tagName;
                     result.typeExpression = tryParseTypeExpression();
                     return finishNode(result);
                 }
                 function parseTypeTag(atToken, tagName) {
-                    if (ts.forEach(tags, function (t) { return t.kind === 295; })) {
+                    if (ts.forEach(tags, function (t) { return t.kind === 295 /* JSDocTypeTag */; })) {
                         parseErrorAt(tagName.pos, scanner.getTokenPos(), ts.Diagnostics._0_tag_already_specified, tagName.escapedText);
                     }
-                    var result = createNode(295, atToken.pos);
+                    var result = createNode(295 /* JSDocTypeTag */, atToken.pos);
                     result.atToken = atToken;
                     result.tagName = tagName;
-                    result.typeExpression = parseJSDocTypeExpression(true);
+                    result.typeExpression = parseJSDocTypeExpression(/*mayOmitBraces*/ true);
                     return finishNode(result);
                 }
                 function parseAugmentsTag(atToken, tagName) {
-                    var result = createNode(290, atToken.pos);
+                    var result = createNode(290 /* JSDocAugmentsTag */, atToken.pos);
                     result.atToken = atToken;
                     result.tagName = tagName;
                     result.class = parseExpressionWithTypeArgumentsForAugments();
                     return finishNode(result);
                 }
                 function parseExpressionWithTypeArgumentsForAugments() {
-                    var usedBrace = parseOptional(17);
-                    var node = createNode(207);
+                    var usedBrace = parseOptional(17 /* OpenBraceToken */);
+                    var node = createNode(207 /* ExpressionWithTypeArguments */);
                     node.expression = parsePropertyAccessEntityNameExpression();
                     node.typeArguments = tryParseTypeArguments();
                     var res = finishNode(node);
                     if (usedBrace) {
-                        parseExpected(18);
+                        parseExpected(18 /* CloseBraceToken */);
                     }
                     return res;
                 }
                 function parsePropertyAccessEntityNameExpression() {
-                    var node = parseJSDocIdentifierName(true);
-                    while (parseOptional(23)) {
-                        var prop = createNode(185, node.pos);
+                    var node = parseJSDocIdentifierName();
+                    while (parseOptional(23 /* DotToken */)) {
+                        var prop = createNode(185 /* PropertyAccessExpression */, node.pos);
                         prop.expression = node;
                         prop.name = parseJSDocIdentifierName();
                         node = finishNode(prop);
@@ -16730,7 +20982,7 @@ var ts;
                     return node;
                 }
                 function parseClassTag(atToken, tagName) {
-                    var tag = createNode(291, atToken.pos);
+                    var tag = createNode(291 /* JSDocClassTag */, atToken.pos);
                     tag.atToken = atToken;
                     tag.tagName = tagName;
                     return finishNode(tag);
@@ -16738,7 +20990,7 @@ var ts;
                 function parseTypedefTag(atToken, tagName, indent) {
                     var typeExpression = tryParseTypeExpression();
                     skipWhitespace();
-                    var typedefTag = createNode(297, atToken.pos);
+                    var typedefTag = createNode(297 /* JSDocTypedefTag */, atToken.pos);
                     typedefTag.atToken = atToken;
                     typedefTag.tagName = tagName;
                     typedefTag.fullName = parseJSDocTypeNameWithNamespace();
@@ -16754,9 +21006,9 @@ var ts;
                         var start_3 = scanner.getStartPos();
                         while (child = tryParse(function () { return parseChildPropertyTag(); })) {
                             if (!jsdocTypeLiteral) {
-                                jsdocTypeLiteral = createNode(287, start_3);
+                                jsdocTypeLiteral = createNode(287 /* JSDocTypeLiteral */, start_3);
                             }
-                            if (child.kind === 295) {
+                            if (child.kind === 295 /* JSDocTypeTag */) {
                                 if (childTypeTag) {
                                     break;
                                 }
@@ -16769,7 +21021,7 @@ var ts;
                             }
                         }
                         if (jsdocTypeLiteral) {
-                            if (typeExpression && typeExpression.type.kind === 167) {
+                            if (typeExpression && typeExpression.type.kind === 167 /* ArrayType */) {
                                 jsdocTypeLiteral.isArrayType = true;
                             }
                             typedefTag.typeExpression = childTypeTag && childTypeTag.typeExpression && !isObjectOrObjectArrayTypeReference(childTypeTag.typeExpression.type) ?
@@ -16778,27 +21030,31 @@ var ts;
                             end = typedefTag.typeExpression.end;
                         }
                     }
+                    // Only include the characters between the name end and the next token if a comment was actually parsed out - otherwise it's just whitespace
                     return finishNode(typedefTag, end || typedefTag.comment !== undefined ? scanner.getStartPos() : (typedefTag.fullName || typedefTag.typeExpression || typedefTag.tagName).end);
                 }
                 function parseJSDocTypeNameWithNamespace(nested) {
                     var pos = scanner.getTokenPos();
+                    if (!ts.tokenIsIdentifierOrKeyword(token())) {
+                        return undefined;
+                    }
                     var typeNameOrNamespaceName = parseJSDocIdentifierName();
-                    if (typeNameOrNamespaceName && parseOptional(23)) {
-                        var jsDocNamespaceNode = createNode(239, pos);
+                    if (parseOptional(23 /* DotToken */)) {
+                        var jsDocNamespaceNode = createNode(239 /* ModuleDeclaration */, pos);
                         if (nested) {
-                            jsDocNamespaceNode.flags |= 4;
+                            jsDocNamespaceNode.flags |= 4 /* NestedNamespace */;
                         }
                         jsDocNamespaceNode.name = typeNameOrNamespaceName;
-                        jsDocNamespaceNode.body = parseJSDocTypeNameWithNamespace(true);
+                        jsDocNamespaceNode.body = parseJSDocTypeNameWithNamespace(/*nested*/ true);
                         return finishNode(jsDocNamespaceNode);
                     }
-                    if (typeNameOrNamespaceName && nested) {
+                    if (nested) {
                         typeNameOrNamespaceName.isInJSDocNamespace = true;
                     }
                     return typeNameOrNamespaceName;
                 }
                 function parseCallbackTag(atToken, tagName, indent) {
-                    var callbackTag = createNode(292, atToken.pos);
+                    var callbackTag = createNode(292 /* JSDocCallbackTag */, atToken.pos);
                     callbackTag.atToken = atToken;
                     callbackTag.tagName = tagName;
                     callbackTag.fullName = parseJSDocTypeNameWithNamespace();
@@ -16807,15 +21063,15 @@ var ts;
                     callbackTag.comment = parseTagComments(indent);
                     var child;
                     var start = scanner.getStartPos();
-                    var jsdocSignature = createNode(288, start);
+                    var jsdocSignature = createNode(288 /* JSDocSignature */, start);
                     jsdocSignature.parameters = [];
-                    while (child = tryParse(function () { return parseChildParameterOrPropertyTag(4); })) {
+                    while (child = tryParse(function () { return parseChildParameterOrPropertyTag(4 /* CallbackParameter */); })) {
                         jsdocSignature.parameters = ts.append(jsdocSignature.parameters, child);
                     }
                     var returnTag = tryParse(function () {
-                        if (parseOptionalJsdoc(57)) {
+                        if (parseOptionalJsdoc(57 /* AtToken */)) {
                             var tag = parseTag(indent);
-                            if (tag && tag.kind === 294) {
+                            if (tag && tag.kind === 294 /* JSDocReturnTag */) {
                                 return tag;
                             }
                         }
@@ -16850,65 +21106,62 @@ var ts;
                     return a.escapedText === b.escapedText;
                 }
                 function parseChildPropertyTag() {
-                    return parseChildParameterOrPropertyTag(1);
+                    return parseChildParameterOrPropertyTag(1 /* Property */);
                 }
                 function parseChildParameterOrPropertyTag(target, name) {
                     var canParseTag = true;
                     var seenAsterisk = false;
                     while (true) {
                         switch (nextJSDocToken()) {
-                            case 57:
+                            case 57 /* AtToken */:
                                 if (canParseTag) {
                                     var child = tryParseChildTag(target);
-                                    if (child && child.kind === 293 &&
-                                        target !== 4 &&
-                                        (ts.isIdentifier(child.name) || !escapedTextsEqual(name, child.name.left))) {
+                                    if (child && child.kind === 293 /* JSDocParameterTag */ &&
+                                        target !== 4 /* CallbackParameter */ &&
+                                        (ts.isIdentifier(child.name) || !escapedTextsEqual(name, child.name.left))) { // TODO: GH#18217
                                         return false;
                                     }
                                     return child;
                                 }
                                 seenAsterisk = false;
                                 break;
-                            case 4:
+                            case 4 /* NewLineTrivia */:
                                 canParseTag = true;
                                 seenAsterisk = false;
                                 break;
-                            case 39:
+                            case 39 /* AsteriskToken */:
                                 if (seenAsterisk) {
                                     canParseTag = false;
                                 }
                                 seenAsterisk = true;
                                 break;
-                            case 71:
+                            case 71 /* Identifier */:
                                 canParseTag = false;
                                 break;
-                            case 1:
+                            case 1 /* EndOfFileToken */:
                                 return false;
                         }
                     }
                 }
                 function tryParseChildTag(target) {
-                    ts.Debug.assert(token() === 57);
-                    var atToken = createNode(57);
+                    ts.Debug.assert(token() === 57 /* AtToken */);
+                    var atToken = createNode(57 /* AtToken */);
                     atToken.end = scanner.getTextPos();
                     nextJSDocToken();
                     var tagName = parseJSDocIdentifierName();
                     skipWhitespace();
-                    if (!tagName) {
-                        return false;
-                    }
                     var t;
                     switch (tagName.escapedText) {
                         case "type":
-                            return target === 1 && parseTypeTag(atToken, tagName);
+                            return target === 1 /* Property */ && parseTypeTag(atToken, tagName);
                         case "prop":
                         case "property":
-                            t = 1;
+                            t = 1 /* Property */;
                             break;
                         case "arg":
                         case "argument":
                         case "param":
-                            t = 2 | 4;
+                            t = 2 /* Parameter */ | 4 /* CallbackParameter */;
                             break;
                         default:
                             return false;
@@ -16916,33 +21169,30 @@ var ts;
                     if (!(target & t)) {
                         return false;
                     }
-                    var tag = parseParameterOrPropertyTag(atToken, tagName, target, undefined);
+                    var tag = parseParameterOrPropertyTag(atToken, tagName, target, /*indent*/ undefined);
                     tag.comment = parseTagComments(tag.end - tag.pos);
                     return tag;
                 }
                 function parseTemplateTag(atToken, tagName) {
+                    // the template tag looks like '@template {Constraint} T,U,V'
                     var constraint;
-                    if (token() === 17) {
+                    if (token() === 17 /* OpenBraceToken */) {
                         constraint = parseJSDocTypeExpression();
                     }
                     var typeParameters = [];
                     var typeParametersPos = getNodePos();
                     do {
                         skipWhitespace();
-                        var typeParameter = createNode(148);
-                        if (!ts.tokenIsIdentifierOrKeyword(token())) {
-                            parseErrorAtCurrentToken(ts.Diagnostics.Unexpected_token_A_type_parameter_name_was_expected_without_curly_braces);
-                            return undefined;
-                        }
-                        typeParameter.name = parseJSDocIdentifierName();
+                        var typeParameter = createNode(148 /* TypeParameter */);
+                        typeParameter.name = parseJSDocIdentifierName(ts.Diagnostics.Unexpected_token_A_type_parameter_name_was_expected_without_curly_braces);
                         skipWhitespace();
                         finishNode(typeParameter);
                         typeParameters.push(typeParameter);
-                    } while (parseOptionalJsdoc(26));
+                    } while (parseOptionalJsdoc(26 /* CommaToken */));
                     if (constraint) {
                         ts.first(typeParameters).constraint = constraint.type;
                     }
-                    var result = createNode(296, atToken.pos);
+                    var result = createNode(296 /* JSDocTemplateTag */, atToken.pos);
                     result.atToken = atToken;
                     result.tagName = tagName;
                     result.typeParameters = createNodeArray(typeParameters, typeParametersPos);
@@ -16960,33 +21210,29 @@ var ts;
                     return false;
                 }
                 function parseJSDocEntityName() {
-                    var entity = parseJSDocIdentifierName(true);
-                    if (parseOptional(21)) {
-                        parseExpected(22);
+                    var entity = parseJSDocIdentifierName();
+                    if (parseOptional(21 /* OpenBracketToken */)) {
+                        parseExpected(22 /* CloseBracketToken */);
+                        // Note that y[] is accepted as an entity name, but the postfix brackets are not saved for checking.
+                        // Technically usejsdoc.org requires them for specifying a property of a type equivalent to Array<{ x: ...}>
+                        // but it's not worth it to enforce that restriction.
                     }
-                    while (parseOptional(23)) {
-                        var name = parseJSDocIdentifierName(true);
-                        if (parseOptional(21)) {
-                            parseExpected(22);
+                    while (parseOptional(23 /* DotToken */)) {
+                        var name = parseJSDocIdentifierName();
+                        if (parseOptional(21 /* OpenBracketToken */)) {
+                            parseExpected(22 /* CloseBracketToken */);
                         }
                         entity = createQualifiedName(entity, name);
                     }
                     return entity;
                 }
-                function parseJSDocIdentifierName(createIfMissing) {
-                    if (createIfMissing === void 0) { createIfMissing = false; }
+                function parseJSDocIdentifierName(message) {
                     if (!ts.tokenIsIdentifierOrKeyword(token())) {
-                        if (createIfMissing) {
-                            return createMissingNode(71, true, ts.Diagnostics.Identifier_expected);
-                        }
-                        else {
-                            parseErrorAtCurrentToken(ts.Diagnostics.Identifier_expected);
-                            return undefined;
-                        }
+                        return createMissingNode(71 /* Identifier */, /*reportAtCurrentPosition*/ !message, message || ts.Diagnostics.Identifier_expected);
                     }
                     var pos = scanner.getTokenPos();
                     var end = scanner.getTextPos();
-                    var result = createNode(71, pos);
+                    var result = createNode(71 /* Identifier */, pos);
                     result.escapedText = ts.escapeLeadingUnderscores(scanner.getTokenText());
                     finishNode(result, end);
                     nextJSDocToken();
@@ -16999,27 +21245,72 @@ var ts;
     var IncrementalParser;
     (function (IncrementalParser) {
         function updateSourceFile(sourceFile, newText, textChangeRange, aggressiveChecks) {
-            aggressiveChecks = aggressiveChecks || ts.Debug.shouldAssert(2);
+            aggressiveChecks = aggressiveChecks || ts.Debug.shouldAssert(2 /* Aggressive */);
             checkChangeRange(sourceFile, newText, textChangeRange, aggressiveChecks);
             if (ts.textChangeRangeIsUnchanged(textChangeRange)) {
+                // if the text didn't change, then we can just return our current source file as-is.
                 return sourceFile;
             }
             if (sourceFile.statements.length === 0) {
-                return Parser.parseSourceFile(sourceFile.fileName, newText, sourceFile.languageVersion, undefined, true, sourceFile.scriptKind);
+                // If we don't have any statements in the current source file, then there's no real
+                // way to incrementally parse.  So just do a full parse instead.
+                return Parser.parseSourceFile(sourceFile.fileName, newText, sourceFile.languageVersion, /*syntaxCursor*/ undefined, /*setParentNodes*/ true, sourceFile.scriptKind);
             }
+            // Make sure we're not trying to incrementally update a source file more than once.  Once
+            // we do an update the original source file is considered unusable from that point onwards.
+            //
+            // This is because we do incremental parsing in-place.  i.e. we take nodes from the old
+            // tree and give them new positions and parents.  From that point on, trusting the old
+            // tree at all is not possible as far too much of it may violate invariants.
             var incrementalSourceFile = sourceFile;
             ts.Debug.assert(!incrementalSourceFile.hasBeenIncrementallyParsed);
             incrementalSourceFile.hasBeenIncrementallyParsed = true;
             var oldText = sourceFile.text;
             var syntaxCursor = createSyntaxCursor(sourceFile);
+            // Make the actual change larger so that we know to reparse anything whose lookahead
+            // might have intersected the change.
             var changeRange = extendToAffectedRange(sourceFile, textChangeRange);
             checkChangeRange(sourceFile, newText, changeRange, aggressiveChecks);
+            // Ensure that extending the affected range only moved the start of the change range
+            // earlier in the file.
             ts.Debug.assert(changeRange.span.start <= textChangeRange.span.start);
             ts.Debug.assert(ts.textSpanEnd(changeRange.span) === ts.textSpanEnd(textChangeRange.span));
             ts.Debug.assert(ts.textSpanEnd(ts.textChangeRangeNewSpan(changeRange)) === ts.textSpanEnd(ts.textChangeRangeNewSpan(textChangeRange)));
+            // The is the amount the nodes after the edit range need to be adjusted.  It can be
+            // positive (if the edit added characters), negative (if the edit deleted characters)
+            // or zero (if this was a pure overwrite with nothing added/removed).
             var delta = ts.textChangeRangeNewSpan(changeRange).length - changeRange.span.length;
+            // If we added or removed characters during the edit, then we need to go and adjust all
+            // the nodes after the edit.  Those nodes may move forward (if we inserted chars) or they
+            // may move backward (if we deleted chars).
+            //
+            // Doing this helps us out in two ways.  First, it means that any nodes/tokens we want
+            // to reuse are already at the appropriate position in the new text.  That way when we
+            // reuse them, we don't have to figure out if they need to be adjusted.  Second, it makes
+            // it very easy to determine if we can reuse a node.  If the node's position is at where
+            // we are in the text, then we can reuse it.  Otherwise we can't.  If the node's position
+            // is ahead of us, then we'll need to rescan tokens.  If the node's position is behind
+            // us, then we'll need to skip it or crumble it as appropriate
+            //
+            // We will also adjust the positions of nodes that intersect the change range as well.
+            // By doing this, we ensure that all the positions in the old tree are consistent, not
+            // just the positions of nodes entirely before/after the change range.  By being
+            // consistent, we can then easily map from positions to nodes in the old tree easily.
+            //
+            // Also, mark any syntax elements that intersect the changed span.  We know, up front,
+            // that we cannot reuse these elements.
             updateTokenPositionsAndMarkElements(incrementalSourceFile, changeRange.span.start, ts.textSpanEnd(changeRange.span), ts.textSpanEnd(ts.textChangeRangeNewSpan(changeRange)), delta, oldText, newText, aggressiveChecks);
-            var result = Parser.parseSourceFile(sourceFile.fileName, newText, sourceFile.languageVersion, syntaxCursor, true, sourceFile.scriptKind);
+            // Now that we've set up our internal incremental state just proceed and parse the
+            // source file in the normal fashion.  When possible the parser will retrieve and
+            // reuse nodes from the old tree.
+            //
+            // Note: passing in 'true' for setNodeParents is very important.  When incrementally
+            // parsing, we will be reusing nodes from the old tree, and placing it into new
+            // parents.  If we don't set the parents now, we'll end up with an observably
+            // inconsistent tree.  Setting the parents on the new tree should be very fast.  We
+            // will immediately bail out of walking any subtrees when we can see that their parents
+            // are already correct.
+            var result = Parser.parseSourceFile(sourceFile.fileName, newText, sourceFile.languageVersion, syntaxCursor, /*setParentNodes*/ true, sourceFile.scriptKind);
             return result;
         }
         IncrementalParser.updateSourceFile = updateSourceFile;
@@ -17036,6 +21327,8 @@ var ts;
                 if (aggressiveChecks && shouldCheckNode(node)) {
                     text = oldText.substring(node.pos, node.end);
                 }
+                // Ditch any existing LS children we may have created.  This way we can avoid
+                // moving them forward.
                 if (node._children) {
                     node._children = undefined;
                 }
@@ -17057,17 +21350,17 @@ var ts;
                 array._children = undefined;
                 array.pos += delta;
                 array.end += delta;
-                for (var _i = 0, array_8 = array; _i < array_8.length; _i++) {
-                    var node = array_8[_i];
+                for (var _i = 0, array_1 = array; _i < array_1.length; _i++) {
+                    var node = array_1[_i];
                     visitNode(node);
                 }
             }
         }
         function shouldCheckNode(node) {
             switch (node.kind) {
-                case 9:
-                case 8:
-                case 71:
+                case 9 /* StringLiteral */:
+                case 8 /* NumericLiteral */:
+                case 71 /* Identifier */:
                     return true;
             }
             return false;
@@ -17076,11 +21369,63 @@ var ts;
             ts.Debug.assert(element.end >= changeStart, "Adjusting an element that was entirely before the change range");
             ts.Debug.assert(element.pos <= changeRangeOldEnd, "Adjusting an element that was entirely after the change range");
             ts.Debug.assert(element.pos <= element.end);
+            // We have an element that intersects the change range in some way.  It may have its
+            // start, or its end (or both) in the changed range.  We want to adjust any part
+            // that intersects such that the final tree is in a consistent state.  i.e. all
+            // children have spans within the span of their parent, and all siblings are ordered
+            // properly.
+            // We may need to update both the 'pos' and the 'end' of the element.
+            // If the 'pos' is before the start of the change, then we don't need to touch it.
+            // If it isn't, then the 'pos' must be inside the change.  How we update it will
+            // depend if delta is positive or negative. If delta is positive then we have
+            // something like:
+            //
+            //  -------------------AAA-----------------
+            //  -------------------BBBCCCCCCC-----------------
+            //
+            // In this case, we consider any node that started in the change range to still be
+            // starting at the same position.
+            //
+            // however, if the delta is negative, then we instead have something like this:
+            //
+            //  -------------------XXXYYYYYYY-----------------
+            //  -------------------ZZZ-----------------
+            //
+            // In this case, any element that started in the 'X' range will keep its position.
+            // However any element that started after that will have their pos adjusted to be
+            // at the end of the new range.  i.e. any node that started in the 'Y' range will
+            // be adjusted to have their start at the end of the 'Z' range.
+            //
+            // The element will keep its position if possible.  Or Move backward to the new-end
+            // if it's in the 'Y' range.
             element.pos = Math.min(element.pos, changeRangeNewEnd);
+            // If the 'end' is after the change range, then we always adjust it by the delta
+            // amount.  However, if the end is in the change range, then how we adjust it
+            // will depend on if delta is positive or negative.  If delta is positive then we
+            // have something like:
+            //
+            //  -------------------AAA-----------------
+            //  -------------------BBBCCCCCCC-----------------
+            //
+            // In this case, we consider any node that ended inside the change range to keep its
+            // end position.
+            //
+            // however, if the delta is negative, then we instead have something like this:
+            //
+            //  -------------------XXXYYYYYYY-----------------
+            //  -------------------ZZZ-----------------
+            //
+            // In this case, any element that ended in the 'X' range will keep its position.
+            // However any element that ended after that will have their pos adjusted to be
+            // at the end of the new range.  i.e. any node that ended in the 'Y' range will
+            // be adjusted to have their end at the end of the 'Z' range.
             if (element.end >= changeRangeOldEnd) {
+                // Element ends after the change range.  Always adjust the end pos.
                 element.end += delta;
             }
             else {
+                // Element ends in the change range.  The element will keep its position if
+                // possible. Or Move backward to the new-end if it's in the 'Y' range.
                 element.end = Math.min(element.end, changeRangeNewEnd);
             }
             ts.Debug.assert(element.pos <= element.end);
@@ -17112,13 +21457,19 @@ var ts;
             function visitNode(child) {
                 ts.Debug.assert(child.pos <= child.end);
                 if (child.pos > changeRangeOldEnd) {
-                    moveElementEntirelyPastChangeRange(child, false, delta, oldText, newText, aggressiveChecks);
+                    // Node is entirely past the change range.  We need to move both its pos and
+                    // end, forward or backward appropriately.
+                    moveElementEntirelyPastChangeRange(child, /*isArray*/ false, delta, oldText, newText, aggressiveChecks);
                     return;
                 }
+                // Check if the element intersects the change range.  If it does, then it is not
+                // reusable.  Also, we'll need to recurse to see what constituent portions we may
+                // be able to use.
                 var fullEnd = child.end;
                 if (fullEnd >= changeStart) {
                     child.intersectsChange = true;
                     child._children = undefined;
+                    // Adjust the pos or end (or both) of the intersecting element accordingly.
                     adjustIntersectingElement(child, changeStart, changeRangeOldEnd, changeRangeNewEnd, delta);
                     forEachChild(child, visitNode, visitArray);
                     if (ts.hasJSDocNodes(child)) {
@@ -17130,31 +21481,52 @@ var ts;
                     checkNodePositions(child, aggressiveChecks);
                     return;
                 }
+                // Otherwise, the node is entirely before the change range.  No need to do anything with it.
                 ts.Debug.assert(fullEnd < changeStart);
             }
             function visitArray(array) {
                 ts.Debug.assert(array.pos <= array.end);
                 if (array.pos > changeRangeOldEnd) {
-                    moveElementEntirelyPastChangeRange(array, true, delta, oldText, newText, aggressiveChecks);
+                    // Array is entirely after the change range.  We need to move it, and move any of
+                    // its children.
+                    moveElementEntirelyPastChangeRange(array, /*isArray*/ true, delta, oldText, newText, aggressiveChecks);
                     return;
                 }
+                // Check if the element intersects the change range.  If it does, then it is not
+                // reusable.  Also, we'll need to recurse to see what constituent portions we may
+                // be able to use.
                 var fullEnd = array.end;
                 if (fullEnd >= changeStart) {
                     array.intersectsChange = true;
                     array._children = undefined;
+                    // Adjust the pos or end (or both) of the intersecting array accordingly.
                     adjustIntersectingElement(array, changeStart, changeRangeOldEnd, changeRangeNewEnd, delta);
-                    for (var _i = 0, array_9 = array; _i < array_9.length; _i++) {
-                        var node = array_9[_i];
+                    for (var _i = 0, array_2 = array; _i < array_2.length; _i++) {
+                        var node = array_2[_i];
                         visitNode(node);
                     }
                     return;
                 }
+                // Otherwise, the array is entirely before the change range.  No need to do anything with it.
                 ts.Debug.assert(fullEnd < changeStart);
             }
         }
         function extendToAffectedRange(sourceFile, changeRange) {
+            // Consider the following code:
+            //      void foo() { /; }
+            //
+            // If the text changes with an insertion of / just before the semicolon then we end up with:
+            //      void foo() { //; }
+            //
+            // If we were to just use the changeRange a is, then we would not rescan the { token
+            // (as it does not intersect the actual original change range).  Because an edit may
+            // change the token touching it, we actually need to look back *at least* one token so
+            // that the prior token sees that change.
             var maxLookahead = 1;
             var start = changeRange.span.start;
+            // the first iteration aligns us with the change start. subsequent iteration move us to
+            // the left by maxLookahead tokens.  We only need to do this as long as we're not at the
+            // start of the tree.
             for (var i = 0; start > 0 && i <= maxLookahead; i++) {
                 var nearestNode = findNearestNodeStartingBeforeOrAtPosition(sourceFile, start);
                 ts.Debug.assert(nearestNode.pos <= start);
@@ -17189,23 +21561,54 @@ var ts;
             }
             function visit(child) {
                 if (ts.nodeIsMissing(child)) {
+                    // Missing nodes are effectively invisible to us.  We never even consider them
+                    // When trying to find the nearest node before us.
                     return;
                 }
+                // If the child intersects this position, then this node is currently the nearest
+                // node that starts before the position.
                 if (child.pos <= position) {
                     if (child.pos >= bestResult.pos) {
+                        // This node starts before the position, and is closer to the position than
+                        // the previous best node we found.  It is now the new best node.
                         bestResult = child;
                     }
+                    // Now, the node may overlap the position, or it may end entirely before the
+                    // position.  If it overlaps with the position, then either it, or one of its
+                    // children must be the nearest node before the position.  So we can just
+                    // recurse into this child to see if we can find something better.
                     if (position < child.end) {
+                        // The nearest node is either this child, or one of the children inside
+                        // of it.  We've already marked this child as the best so far.  Recurse
+                        // in case one of the children is better.
                         forEachChild(child, visit);
+                        // Once we look at the children of this node, then there's no need to
+                        // continue any further.
                         return true;
                     }
                     else {
                         ts.Debug.assert(child.end <= position);
+                        // The child ends entirely before this position.  Say you have the following
+                        // (where $ is the position)
+                        //
+                        //      <complex expr 1> ? <complex expr 2> $ : <...> <...>
+                        //
+                        // We would want to find the nearest preceding node in "complex expr 2".
+                        // To support that, we keep track of this node, and once we're done searching
+                        // for a best node, we recurse down this node to see if we can find a good
+                        // result in it.
+                        //
+                        // This approach allows us to quickly skip over nodes that are entirely
+                        // before the position, while still allowing us to find any nodes in the
+                        // last one that might be what we want.
                         lastNodeEntirelyBeforePosition = child;
                     }
                 }
                 else {
                     ts.Debug.assert(child.pos > position);
+                    // We're now at a node that is entirely past the position we're searching for.
+                    // This node (and all following nodes) could never contribute to the result,
+                    // so just skip them by returning 'true' here.
                     return true;
                 }
             }
@@ -17214,7 +21617,7 @@ var ts;
             var oldText = sourceFile.text;
             if (textChangeRange) {
                 ts.Debug.assert((oldText.length - textChangeRange.span.length + textChangeRange.newLength) === newText.length);
-                if (aggressiveChecks || ts.Debug.shouldAssert(3)) {
+                if (aggressiveChecks || ts.Debug.shouldAssert(3 /* VeryAggressive */)) {
                     var oldTextPrefix = oldText.substr(0, textChangeRange.span.start);
                     var newTextPrefix = newText.substr(0, textChangeRange.span.start);
                     ts.Debug.assert(oldTextPrefix === newTextPrefix);
@@ -17229,42 +21632,68 @@ var ts;
             var currentArrayIndex = 0;
             ts.Debug.assert(currentArrayIndex < currentArray.length);
             var current = currentArray[currentArrayIndex];
-            var lastQueriedPosition = -1;
+            var lastQueriedPosition = -1 /* Value */;
             return {
                 currentNode: function (position) {
+                    // Only compute the current node if the position is different than the last time
+                    // we were asked.  The parser commonly asks for the node at the same position
+                    // twice.  Once to know if can read an appropriate list element at a certain point,
+                    // and then to actually read and consume the node.
                     if (position !== lastQueriedPosition) {
+                        // Much of the time the parser will need the very next node in the array that
+                        // we just returned a node from.So just simply check for that case and move
+                        // forward in the array instead of searching for the node again.
                         if (current && current.end === position && currentArrayIndex < (currentArray.length - 1)) {
                             currentArrayIndex++;
                             current = currentArray[currentArrayIndex];
                         }
+                        // If we don't have a node, or the node we have isn't in the right position,
+                        // then try to find a viable node at the position requested.
                         if (!current || current.pos !== position) {
                             findHighestListElementThatStartsAtPosition(position);
                         }
                     }
+                    // Cache this query so that we don't do any extra work if the parser calls back
+                    // into us.  Note: this is very common as the parser will make pairs of calls like
+                    // 'isListElement -> parseListElement'.  If we were unable to find a node when
+                    // called with 'isListElement', we don't want to redo the work when parseListElement
+                    // is called immediately after.
                     lastQueriedPosition = position;
+                    // Either we don'd have a node, or we have a node at the position being asked for.
                     ts.Debug.assert(!current || current.pos === position);
                     return current;
                 }
             };
+            // Finds the highest element in the tree we can find that starts at the provided position.
+            // The element must be a direct child of some node list in the tree.  This way after we
+            // return it, we can easily return its next sibling in the list.
             function findHighestListElementThatStartsAtPosition(position) {
+                // Clear out any cached state about the last node we found.
                 currentArray = undefined;
-                currentArrayIndex = -1;
+                currentArrayIndex = -1 /* Value */;
                 current = undefined;
+                // Recurse into the source file to find the highest node at this position.
                 forEachChild(sourceFile, visitNode, visitArray);
                 return;
                 function visitNode(node) {
                     if (position >= node.pos && position < node.end) {
+                        // Position was within this node.  Keep searching deeper to find the node.
                         forEachChild(node, visitNode, visitArray);
+                        // don't proceed any further in the search.
                         return true;
                     }
+                    // position wasn't in this node, have to keep searching.
                     return false;
                 }
                 function visitArray(array) {
                     if (position >= array.pos && position < array.end) {
+                        // position was in this array.  Search through this array to see if we find a
+                        // viable element.
                         for (var i = 0; i < array.length; i++) {
                             var child = array[i];
                             if (child) {
                                 if (child.pos === position) {
+                                    // Found the right node.  We're done.
                                     currentArray = array;
                                     currentArrayIndex = i;
                                     current = child;
@@ -17272,6 +21701,8 @@ var ts;
                                 }
                                 else {
                                     if (child.pos < position && position < child.end) {
+                                        // Position in somewhere within this child.  Search in it and
+                                        // stop searching in this array.
                                         forEachChild(child, visitNode, visitArray);
                                         return true;
                                     }
@@ -17279,17 +21710,26 @@ var ts;
                             }
                         }
                     }
+                    // position wasn't in this array, have to keep searching.
                     return false;
                 }
             }
         }
+        var InvalidPosition;
+        (function (InvalidPosition) {
+            InvalidPosition[InvalidPosition["Value"] = -1] = "Value";
+        })(InvalidPosition || (InvalidPosition = {}));
     })(IncrementalParser || (IncrementalParser = {}));
     function isDeclarationFileName(fileName) {
-        return ts.fileExtensionIs(fileName, ".d.ts");
+        return ts.fileExtensionIs(fileName, ".d.ts" /* Dts */);
     }
+    /*@internal*/
     function processCommentPragmas(context, sourceText) {
-        var triviaScanner = ts.createScanner(context.languageVersion, false, 0, sourceText);
+        var triviaScanner = ts.createScanner(context.languageVersion, /*skipTrivia*/ false, 0 /* Standard */, sourceText);
         var pragmas = [];
+        // Keep scanning all the leading trivia in the file until we get to something that
+        // isn't trivia.  Any single line comment will be analyzed to see if it is a
+        // reference comment.
         while (true) {
             var kind = triviaScanner.scan();
             if (!ts.isTrivia(kind)) {
@@ -17306,7 +21746,7 @@ var ts;
         context.pragmas = ts.createMap();
         for (var _i = 0, pragmas_1 = pragmas; _i < pragmas_1.length; _i++) {
             var pragma = pragmas_1[_i];
-            if (context.pragmas.has(pragma.name)) {
+            if (context.pragmas.has(pragma.name)) { // TODO: GH#18217
                 var currentValue = context.pragmas.get(pragma.name);
                 if (currentValue instanceof Array) {
                     currentValue.push(pragma.args);
@@ -17320,24 +21760,33 @@ var ts;
         }
     }
     ts.processCommentPragmas = processCommentPragmas;
+    /*@internal*/
     function processPragmasIntoFields(context, reportDiagnostic) {
         context.checkJsDirective = undefined;
         context.referencedFiles = [];
         context.typeReferenceDirectives = [];
+        context.libReferenceDirectives = [];
         context.amdDependencies = [];
         context.hasNoDefaultLib = false;
         context.pragmas.forEach(function (entryOrList, key) {
+            // TODO: The below should be strongly type-guarded and not need casts/explicit annotations, since entryOrList is related to
+            // key and key is constrained to a union; but it's not (see GH#21483 for at least partial fix) :(
             switch (key) {
                 case "reference": {
                     var referencedFiles_1 = context.referencedFiles;
                     var typeReferenceDirectives_1 = context.typeReferenceDirectives;
+                    var libReferenceDirectives_1 = context.libReferenceDirectives;
                     ts.forEach(ts.toArray(entryOrList), function (arg) {
+                        // TODO: GH#18217
                         if (arg.arguments["no-default-lib"]) {
                             context.hasNoDefaultLib = true;
                         }
                         else if (arg.arguments.types) {
                             typeReferenceDirectives_1.push({ pos: arg.arguments.types.pos, end: arg.arguments.types.end, fileName: arg.arguments.types.value });
                         }
+                        else if (arg.arguments.lib) {
+                            libReferenceDirectives_1.push({ pos: arg.arguments.lib.pos, end: arg.arguments.lib.end, fileName: arg.arguments.lib.value });
+                        }
                         else if (arg.arguments.path) {
                             referencedFiles_1.push({ pos: arg.arguments.path.pos, end: arg.arguments.path.end, fileName: arg.arguments.path.value });
                         }
@@ -17348,7 +21797,7 @@ var ts;
                     break;
                 }
                 case "amd-dependency": {
-                    context.amdDependencies = ts.map(ts.toArray(entryOrList), function (x) { return ({ name: x.arguments.name, path: x.arguments.path }); });
+                    context.amdDependencies = ts.map(ts.toArray(entryOrList), function (x) { return ({ name: x.arguments.name, path: x.arguments.path }); }); // TODO: GH#18217
                     break;
                 }
                 case "amd-module": {
@@ -17356,6 +21805,7 @@ var ts;
                         for (var _i = 0, entryOrList_1 = entryOrList; _i < entryOrList_1.length; _i++) {
                             var entry = entryOrList_1[_i];
                             if (context.moduleName) {
+                                // TODO: It's probably fine to issue this diagnostic on all instances of the pragma
                                 reportDiagnostic(entry.range.pos, entry.range.end - entry.range.pos, ts.Diagnostics.An_AMD_module_cannot_have_multiple_name_assignments);
                             }
                             context.moduleName = entry.arguments.name;
@@ -17368,8 +21818,9 @@ var ts;
                 }
                 case "ts-nocheck":
                 case "ts-check": {
+                    // _last_ of either nocheck or check in a file is the "winner"
                     ts.forEach(ts.toArray(entryOrList), function (entry) {
-                        if (!context.checkJsDirective || entry.range.pos > context.checkJsDirective.pos) {
+                        if (!context.checkJsDirective || entry.range.pos > context.checkJsDirective.pos) { // TODO: GH#18217
                             context.checkJsDirective = {
                                 enabled: key === "ts-check",
                                 end: entry.range.end,
@@ -17379,8 +21830,8 @@ var ts;
                     });
                     break;
                 }
-                case "jsx": return;
-                default: ts.Debug.fail("Unhandled pragma kind");
+                case "jsx": return; // Accessed directly
+                default: ts.Debug.fail("Unhandled pragma kind"); // Can this be made into an assertNever in the future?
             }
         });
     }
@@ -17397,11 +21848,11 @@ var ts;
     var tripleSlashXMLCommentStartRegEx = /^\/\/\/\s*<(\S+)\s.*?\/>/im;
     var singleLinePragmaRegEx = /^\/\/\/?\s*@(\S+)\s*(.*)\s*$/im;
     function extractPragmas(pragmas, range, text) {
-        var tripleSlash = range.kind === 2 && tripleSlashXMLCommentStartRegEx.exec(text);
+        var tripleSlash = range.kind === 2 /* SingleLineCommentTrivia */ && tripleSlashXMLCommentStartRegEx.exec(text);
         if (tripleSlash) {
-            var name = tripleSlash[1].toLowerCase();
+            var name = tripleSlash[1].toLowerCase(); // Technically unsafe cast, but we do it so the below check to make it safe typechecks
             var pragma = ts.commentPragmas[name];
-            if (!pragma || !(pragma.kind & 1)) {
+            if (!pragma || !(pragma.kind & 1 /* TripleSlashXML */)) {
                 return;
             }
             if (pragma.args) {
@@ -17411,7 +21862,7 @@ var ts;
                     var matcher = getNamedArgRegEx(arg.name);
                     var matchResult = matcher.exec(text);
                     if (!matchResult && !arg.optional) {
-                        return;
+                        return; // Missing required argument, don't parse
                     }
                     else if (matchResult) {
                         if (arg.captureSpan) {
@@ -17434,30 +21885,30 @@ var ts;
             }
             return;
         }
-        var singleLine = range.kind === 2 && singleLinePragmaRegEx.exec(text);
+        var singleLine = range.kind === 2 /* SingleLineCommentTrivia */ && singleLinePragmaRegEx.exec(text);
         if (singleLine) {
-            return addPragmaForMatch(pragmas, range, 2, singleLine);
+            return addPragmaForMatch(pragmas, range, 2 /* SingleLine */, singleLine);
         }
-        if (range.kind === 3) {
-            var multiLinePragmaRegEx = /\s*@(\S+)\s*(.*)\s*$/gim;
+        if (range.kind === 3 /* MultiLineCommentTrivia */) {
+            var multiLinePragmaRegEx = /\s*@(\S+)\s*(.*)\s*$/gim; // Defined inline since it uses the "g" flag, which keeps a persistent index (for iterating)
             var multiLineMatch = void 0;
             while (multiLineMatch = multiLinePragmaRegEx.exec(text)) {
-                addPragmaForMatch(pragmas, range, 4, multiLineMatch);
+                addPragmaForMatch(pragmas, range, 4 /* MultiLine */, multiLineMatch);
             }
         }
     }
     function addPragmaForMatch(pragmas, range, kind, match) {
         if (!match)
             return;
-        var name = match[1].toLowerCase();
+        var name = match[1].toLowerCase(); // Technically unsafe cast, but we do it so they below check to make it safe typechecks
         var pragma = ts.commentPragmas[name];
         if (!pragma || !(pragma.kind & kind)) {
             return;
         }
-        var args = match[2];
+        var args = match[2]; // Split on spaces and match up positionally with definition
         var argument = getNamedPragmaArguments(pragma, args);
         if (argument === "fail")
-            return;
+            return; // Missing required argument, fail to parse it
         pragmas.push({ name: name, args: { arguments: argument, range: range } });
         return;
     }
@@ -17480,16 +21931,20 @@ var ts;
         }
         return argMap;
     }
+    /** @internal */
     function tagNamesAreEquivalent(lhs, rhs) {
         if (lhs.kind !== rhs.kind) {
             return false;
         }
-        if (lhs.kind === 71) {
+        if (lhs.kind === 71 /* Identifier */) {
             return lhs.escapedText === rhs.escapedText;
         }
-        if (lhs.kind === 99) {
+        if (lhs.kind === 99 /* ThisKeyword */) {
             return true;
         }
+        // If we are at this statement then we must have PropertyAccessExpression and because tag name in Jsx element can only
+        // take forms of JsxTagNameExpression which includes an identifier, "this" expression, or another propertyAccessExpression
+        // it is safe to case the expression property as such. See parseJsxElementName for how we parse tag name in Jsx element
         return lhs.name.escapedText === rhs.name.escapedText &&
             tagNamesAreEquivalent(lhs.expression, rhs.expression);
     }
@@ -17497,8 +21952,67 @@ var ts;
 })(ts || (ts = {}));
 var ts;
 (function (ts) {
+    /* @internal */
     ts.compileOnSaveCommandLineOption = { name: "compileOnSave", type: "boolean" };
+    // NOTE: The order here is important to default lib ordering as entries will have the same
+    //       order in the generated program (see `getDefaultLibPriority` in program.ts). This
+    //       order also affects overload resolution when a type declared in one lib is
+    //       augmented in another lib.
+    var libEntries = [
+        // JavaScript only
+        ["es5", "lib.es5.d.ts"],
+        ["es6", "lib.es2015.d.ts"],
+        ["es2015", "lib.es2015.d.ts"],
+        ["es7", "lib.es2016.d.ts"],
+        ["es2016", "lib.es2016.d.ts"],
+        ["es2017", "lib.es2017.d.ts"],
+        ["es2018", "lib.es2018.d.ts"],
+        ["esnext", "lib.esnext.d.ts"],
+        // Host only
+        ["dom", "lib.dom.d.ts"],
+        ["dom.iterable", "lib.dom.iterable.d.ts"],
+        ["webworker", "lib.webworker.d.ts"],
+        ["webworker.importscripts", "lib.webworker.importscripts.d.ts"],
+        ["scripthost", "lib.scripthost.d.ts"],
+        // ES2015 Or ESNext By-feature options
+        ["es2015.core", "lib.es2015.core.d.ts"],
+        ["es2015.collection", "lib.es2015.collection.d.ts"],
+        ["es2015.generator", "lib.es2015.generator.d.ts"],
+        ["es2015.iterable", "lib.es2015.iterable.d.ts"],
+        ["es2015.promise", "lib.es2015.promise.d.ts"],
+        ["es2015.proxy", "lib.es2015.proxy.d.ts"],
+        ["es2015.reflect", "lib.es2015.reflect.d.ts"],
+        ["es2015.symbol", "lib.es2015.symbol.d.ts"],
+        ["es2015.symbol.wellknown", "lib.es2015.symbol.wellknown.d.ts"],
+        ["es2016.array.include", "lib.es2016.array.include.d.ts"],
+        ["es2017.object", "lib.es2017.object.d.ts"],
+        ["es2017.sharedmemory", "lib.es2017.sharedmemory.d.ts"],
+        ["es2017.string", "lib.es2017.string.d.ts"],
+        ["es2017.intl", "lib.es2017.intl.d.ts"],
+        ["es2017.typedarrays", "lib.es2017.typedarrays.d.ts"],
+        ["es2018.intl", "lib.es2018.intl.d.ts"],
+        ["es2018.promise", "lib.es2018.promise.d.ts"],
+        ["es2018.regexp", "lib.es2018.regexp.d.ts"],
+        ["esnext.array", "lib.esnext.array.d.ts"],
+        ["esnext.symbol", "lib.esnext.symbol.d.ts"],
+        ["esnext.asynciterable", "lib.esnext.asynciterable.d.ts"],
+    ];
+    /**
+     * An array of supported "lib" reference file names used to determine the order for inclusion
+     * when referenced, as well as for spelling suggestions. This ensures the correct ordering for
+     * overload resolution when a type declared in one lib is extended by another.
+     */
+    /* @internal */
+    ts.libs = libEntries.map(function (entry) { return entry[0]; });
+    /**
+     * A map of lib names to lib files. This map is used both for parsing the "lib" command line
+     * option as well as for resolving lib reference directives.
+     */
+    /* @internal */
+    ts.libMap = ts.createMapFromEntries(libEntries);
+    /* @internal */
     ts.optionDeclarations = [
+        // CommandLine only options
         {
             name: "help",
             shortName: "h",
@@ -17544,6 +22058,14 @@ var ts;
             paramType: ts.Diagnostics.FILE_OR_DIRECTORY,
             description: ts.Diagnostics.Compile_the_project_given_the_path_to_its_configuration_file_or_to_a_folder_with_a_tsconfig_json,
         },
+        {
+            name: "build",
+            type: "boolean",
+            shortName: "b",
+            showInSimplifiedHelpView: true,
+            category: ts.Diagnostics.Command_line_Options,
+            description: ts.Diagnostics.Build_one_or_more_projects_and_their_dependencies_if_out_of_date
+        },
         {
             name: "pretty",
             type: "boolean",
@@ -17566,18 +22088,19 @@ var ts;
             category: ts.Diagnostics.Command_line_Options,
             description: ts.Diagnostics.Watch_input_files,
         },
+        // Basic
         {
             name: "target",
             shortName: "t",
             type: ts.createMapFromTemplate({
-                es3: 0,
-                es5: 1,
-                es6: 2,
-                es2015: 2,
-                es2016: 3,
-                es2017: 4,
-                es2018: 5,
-                esnext: 6,
+                es3: 0 /* ES3 */,
+                es5: 1 /* ES5 */,
+                es6: 2 /* ES2015 */,
+                es2015: 2 /* ES2015 */,
+                es2016: 3 /* ES2016 */,
+                es2017: 4 /* ES2017 */,
+                es2018: 5 /* ES2018 */,
+                esnext: 6 /* ESNext */,
             }),
             paramType: ts.Diagnostics.VERSION,
             showInSimplifiedHelpView: true,
@@ -17607,41 +22130,7 @@ var ts;
             type: "list",
             element: {
                 name: "lib",
-                type: ts.createMapFromTemplate({
-                    "es5": "lib.es5.d.ts",
-                    "es6": "lib.es2015.d.ts",
-                    "es2015": "lib.es2015.d.ts",
-                    "es7": "lib.es2016.d.ts",
-                    "es2016": "lib.es2016.d.ts",
-                    "es2017": "lib.es2017.d.ts",
-                    "es2018": "lib.es2018.d.ts",
-                    "esnext": "lib.esnext.d.ts",
-                    "dom": "lib.dom.d.ts",
-                    "dom.iterable": "lib.dom.iterable.d.ts",
-                    "webworker": "lib.webworker.d.ts",
-                    "scripthost": "lib.scripthost.d.ts",
-                    "es2015.core": "lib.es2015.core.d.ts",
-                    "es2015.collection": "lib.es2015.collection.d.ts",
-                    "es2015.generator": "lib.es2015.generator.d.ts",
-                    "es2015.iterable": "lib.es2015.iterable.d.ts",
-                    "es2015.promise": "lib.es2015.promise.d.ts",
-                    "es2015.proxy": "lib.es2015.proxy.d.ts",
-                    "es2015.reflect": "lib.es2015.reflect.d.ts",
-                    "es2015.symbol": "lib.es2015.symbol.d.ts",
-                    "es2015.symbol.wellknown": "lib.es2015.symbol.wellknown.d.ts",
-                    "es2016.array.include": "lib.es2016.array.include.d.ts",
-                    "es2017.object": "lib.es2017.object.d.ts",
-                    "es2017.sharedmemory": "lib.es2017.sharedmemory.d.ts",
-                    "es2017.string": "lib.es2017.string.d.ts",
-                    "es2017.intl": "lib.es2017.intl.d.ts",
-                    "es2017.typedarrays": "lib.es2017.typedarrays.d.ts",
-                    "es2018.intl": "lib.es2018.intl.d.ts",
-                    "es2018.promise": "lib.es2018.promise.d.ts",
-                    "es2018.regexp": "lib.es2018.regexp.d.ts",
-                    "esnext.array": "lib.esnext.array.d.ts",
-                    "esnext.symbol": "lib.esnext.symbol.d.ts",
-                    "esnext.asynciterable": "lib.esnext.asynciterable.d.ts",
-                }),
+                type: ts.libMap
             },
             showInSimplifiedHelpView: true,
             category: ts.Diagnostics.Basic_Options,
@@ -17663,9 +22152,9 @@ var ts;
         {
             name: "jsx",
             type: ts.createMapFromTemplate({
-                "preserve": 1,
-                "react-native": 3,
-                "react": 2
+                "preserve": 1 /* Preserve */,
+                "react-native": 3 /* ReactNative */,
+                "react": 2 /* React */
             }),
             paramType: ts.Diagnostics.KIND,
             showInSimplifiedHelpView: true,
@@ -17765,6 +22254,7 @@ var ts;
             category: ts.Diagnostics.Basic_Options,
             description: ts.Diagnostics.Transpile_each_file_as_a_separate_module_similar_to_ts_transpileModule
         },
+        // Strict Type Checks
         {
             name: "strict",
             type: "boolean",
@@ -17814,6 +22304,7 @@ var ts;
             category: ts.Diagnostics.Strict_Type_Checking_Options,
             description: ts.Diagnostics.Parse_in_strict_mode_and_emit_use_strict_for_each_source_file
         },
+        // Additional Checks
         {
             name: "noUnusedLocals",
             type: "boolean",
@@ -17842,6 +22333,7 @@ var ts;
             category: ts.Diagnostics.Additional_Checks,
             description: ts.Diagnostics.Report_errors_for_fallthrough_cases_in_switch_statement
         },
+        // Module Resolution
         {
             name: "moduleResolution",
             type: ts.createMapFromTemplate({
@@ -17860,6 +22352,8 @@ var ts;
             description: ts.Diagnostics.Base_directory_to_resolve_non_absolute_module_names
         },
         {
+            // this option can only be specified in tsconfig.json
+            // use type = object to copy the value as-is
             name: "paths",
             type: "object",
             isTSConfigOnly: true,
@@ -17867,6 +22361,8 @@ var ts;
             description: ts.Diagnostics.A_series_of_entries_which_re_map_imports_to_lookup_locations_relative_to_the_baseUrl
         },
         {
+            // this option can only be specified in tsconfig.json
+            // use type = object to copy the value as-is
             name: "rootDirs",
             type: "list",
             isTSConfigOnly: true,
@@ -17919,6 +22415,7 @@ var ts;
             category: ts.Diagnostics.Module_Resolution_Options,
             description: ts.Diagnostics.Do_not_resolve_the_real_path_of_symlinks,
         },
+        // Source Maps
         {
             name: "sourceRoot",
             type: "string",
@@ -17947,6 +22444,7 @@ var ts;
             category: ts.Diagnostics.Source_Map_Options,
             description: ts.Diagnostics.Emit_the_source_alongside_the_sourcemaps_within_a_single_file_requires_inlineSourceMap_or_sourceMap_to_be_set
         },
+        // Experimental
         {
             name: "experimentalDecorators",
             type: "boolean",
@@ -17959,6 +22457,7 @@ var ts;
             category: ts.Diagnostics.Experimental_Options,
             description: ts.Diagnostics.Enables_experimental_support_for_emitting_type_metadata_for_decorators
         },
+        // Advanced
         {
             name: "jsxFactory",
             type: "string",
@@ -18005,6 +22504,7 @@ var ts;
             name: "out",
             type: "string",
             isFilePath: false,
+            // for correct behaviour, please use outFile
             category: ts.Diagnostics.Advanced_Options,
             paramType: ts.Diagnostics.FILE,
             description: ts.Diagnostics.Deprecated_Use_outFile_instead_Concatenate_and_emit_output_to_single_file,
@@ -18042,8 +22542,8 @@ var ts;
         {
             name: "newLine",
             type: ts.createMapFromTemplate({
-                crlf: 0,
-                lf: 1
+                crlf: 0 /* CarriageReturnLineFeed */,
+                lf: 1 /* LineFeed */
             }),
             paramType: ts.Diagnostics.NEWLINE,
             category: ts.Diagnostics.Advanced_Options,
@@ -18166,6 +22666,7 @@ var ts;
             description: ts.Diagnostics.Resolve_keyof_to_string_valued_property_names_only_no_numbers_or_symbols,
         },
         {
+            // A list of plugins to load in the language service
             name: "plugins",
             type: "list",
             isTSConfigOnly: true,
@@ -18176,8 +22677,12 @@ var ts;
             description: ts.Diagnostics.List_of_language_service_plugins
         }
     ];
+    /* @internal */
     ts.typeAcquisitionDeclarations = [
         {
+            /* @deprecated typingOptions.enableAutoDiscovery
+             * Use typeAcquisition.enable instead.
+             */
             name: "enableAutoDiscovery",
             type: "boolean",
         },
@@ -18202,14 +22707,17 @@ var ts;
             }
         }
     ];
+    /* @internal */
     ts.defaultInitCompilerOptions = {
         module: ts.ModuleKind.CommonJS,
-        target: 1,
+        target: 1 /* ES5 */,
         strict: true,
         esModuleInterop: true
     };
     var optionNameMapCache;
+    /* @internal */
     function convertEnableAutoDiscoveryToEnable(typeAcquisition) {
+        // Convert deprecated typingOptions.enableAutoDiscovery to typeAcquisition.enable
         if (typeAcquisition && typeAcquisition.enableAutoDiscovery !== undefined && typeAcquisition.enable === undefined) {
             return {
                 enable: typeAcquisition.enableAutoDiscovery,
@@ -18235,6 +22743,7 @@ var ts;
         optionNameMapCache = { optionNameMap: optionNameMap, shortOptionNames: shortOptionNames };
         return optionNameMapCache;
     }
+    /* @internal */
     function createCompilerDiagnosticForInvalidCustomType(opt) {
         return createDiagnosticForInvalidCustomType(opt, ts.createCompilerDiagnostic);
     }
@@ -18243,10 +22752,12 @@ var ts;
         var namesOfType = ts.arrayFrom(opt.type.keys()).map(function (key) { return "'" + key + "'"; }).join(", ");
         return createDiagnostic(ts.Diagnostics.Argument_for_0_option_must_be_Colon_1, "--" + opt.name, namesOfType);
     }
+    /* @internal */
     function parseCustomTypeOption(opt, value, errors) {
         return convertJsonOptionOfCustomType(opt, trimString(value || ""), errors);
     }
     ts.parseCustomTypeOption = parseCustomTypeOption;
+    /* @internal */
     function parseListTypeOption(opt, value, errors) {
         if (value === void 0) { value = ""; }
         value = trimString(value);
@@ -18284,16 +22795,17 @@ var ts;
             while (i < args.length) {
                 var s = args[i];
                 i++;
-                if (s.charCodeAt(0) === 64) {
+                if (s.charCodeAt(0) === 64 /* at */) {
                     parseResponseFile(s.slice(1));
                 }
-                else if (s.charCodeAt(0) === 45) {
-                    var opt = getOptionFromName(s.slice(s.charCodeAt(1) === 45 ? 2 : 1), true);
+                else if (s.charCodeAt(0) === 45 /* minus */) {
+                    var opt = getOptionFromName(s.slice(s.charCodeAt(1) === 45 /* minus */ ? 2 : 1), /*allowShort*/ true);
                     if (opt) {
                         if (opt.isTSConfigOnly) {
                             errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Option_0_can_only_be_specified_in_tsconfig_json_file, opt.name));
                         }
                         else {
+                            // Check to see if no argument was provided (e.g. "--locale" is the last command-line argument).
                             if (!args[i] && opt.type !== "boolean") {
                                 errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Compiler_option_0_expects_an_argument, opt.name));
                             }
@@ -18303,8 +22815,10 @@ var ts;
                                     i++;
                                     break;
                                 case "boolean":
+                                    // boolean flag has optional value true, false, others
                                     var optValue = args[i];
                                     options[opt.name] = optValue !== "false";
+                                    // consume next argument as boolean flag value
                                     if (optValue === "false" || optValue === "true") {
                                         i++;
                                     }
@@ -18320,6 +22834,7 @@ var ts;
                                         i++;
                                     }
                                     break;
+                                // If not a primitive, the possible types are specified in what is effectively a map of options.
                                 default:
                                     options[opt.name] = parseCustomTypeOption(opt, args[i], errors);
                                     i++;
@@ -18345,14 +22860,14 @@ var ts;
             var args = [];
             var pos = 0;
             while (true) {
-                while (pos < text.length && text.charCodeAt(pos) <= 32)
+                while (pos < text.length && text.charCodeAt(pos) <= 32 /* space */)
                     pos++;
                 if (pos >= text.length)
                     break;
                 var start = pos;
-                if (text.charCodeAt(start) === 34) {
+                if (text.charCodeAt(start) === 34 /* doubleQuote */) {
                     pos++;
-                    while (pos < text.length && text.charCodeAt(pos) !== 34)
+                    while (pos < text.length && text.charCodeAt(pos) !== 34 /* doubleQuote */)
                         pos++;
                     if (pos < text.length) {
                         args.push(text.substring(start + 1, pos));
@@ -18363,7 +22878,7 @@ var ts;
                     }
                 }
                 else {
-                    while (text.charCodeAt(pos) > 32)
+                    while (text.charCodeAt(pos) > 32 /* space */)
                         pos++;
                     args.push(text.substring(start, pos));
                 }
@@ -18372,10 +22887,12 @@ var ts;
         }
     }
     ts.parseCommandLine = parseCommandLine;
+    /** @internal */
     function getOptionFromName(optionName, allowShort) {
         if (allowShort === void 0) { allowShort = false; }
         optionName = optionName.toLowerCase();
         var _a = getOptionNameMap(), optionNameMap = _a.optionNameMap, shortOptionNames = _a.shortOptionNames;
+        // Try to translate short option names to their full equivalents.
         if (allowShort) {
             var short = shortOptionNames.get(optionName);
             if (short !== undefined) {
@@ -18385,6 +22902,115 @@ var ts;
         return optionNameMap.get(optionName);
     }
     ts.getOptionFromName = getOptionFromName;
+    function getDiagnosticText(_message) {
+        var _args = [];
+        for (var _i = 1; _i < arguments.length; _i++) {
+            _args[_i - 1] = arguments[_i];
+        }
+        var diagnostic = ts.createCompilerDiagnostic.apply(undefined, arguments);
+        return diagnostic.messageText;
+    }
+    /* @internal */
+    function printVersion() {
+        ts.sys.write(getDiagnosticText(ts.Diagnostics.Version_0, ts.version) + ts.sys.newLine);
+    }
+    ts.printVersion = printVersion;
+    /* @internal */
+    function printHelp(optionsList, syntaxPrefix) {
+        if (syntaxPrefix === void 0) { syntaxPrefix = ""; }
+        var output = [];
+        // We want to align our "syntax" and "examples" commands to a certain margin.
+        var syntaxLength = getDiagnosticText(ts.Diagnostics.Syntax_Colon_0, "").length;
+        var examplesLength = getDiagnosticText(ts.Diagnostics.Examples_Colon_0, "").length;
+        var marginLength = Math.max(syntaxLength, examplesLength);
+        // Build up the syntactic skeleton.
+        var syntax = makePadding(marginLength - syntaxLength);
+        syntax += "tsc " + syntaxPrefix + "[" + getDiagnosticText(ts.Diagnostics.options) + "] [" + getDiagnosticText(ts.Diagnostics.file) + "...]";
+        output.push(getDiagnosticText(ts.Diagnostics.Syntax_Colon_0, syntax));
+        output.push(ts.sys.newLine + ts.sys.newLine);
+        // Build up the list of examples.
+        var padding = makePadding(marginLength);
+        output.push(getDiagnosticText(ts.Diagnostics.Examples_Colon_0, makePadding(marginLength - examplesLength) + "tsc hello.ts") + ts.sys.newLine);
+        output.push(padding + "tsc --outFile file.js file.ts" + ts.sys.newLine);
+        output.push(padding + "tsc @args.txt" + ts.sys.newLine);
+        output.push(padding + "tsc --build tsconfig.json" + ts.sys.newLine);
+        output.push(ts.sys.newLine);
+        output.push(getDiagnosticText(ts.Diagnostics.Options_Colon) + ts.sys.newLine);
+        // We want our descriptions to align at the same column in our output,
+        // so we keep track of the longest option usage string.
+        marginLength = 0;
+        var usageColumn = []; // Things like "-d, --declaration" go in here.
+        var descriptionColumn = [];
+        var optionsDescriptionMap = ts.createMap(); // Map between option.description and list of option.type if it is a kind
+        for (var _i = 0, optionsList_1 = optionsList; _i < optionsList_1.length; _i++) {
+            var option = optionsList_1[_i];
+            // If an option lacks a description,
+            // it is not officially supported.
+            if (!option.description) {
+                continue;
+            }
+            var usageText_1 = " ";
+            if (option.shortName) {
+                usageText_1 += "-" + option.shortName;
+                usageText_1 += getParamType(option);
+                usageText_1 += ", ";
+            }
+            usageText_1 += "--" + option.name;
+            usageText_1 += getParamType(option);
+            usageColumn.push(usageText_1);
+            var description = void 0;
+            if (option.name === "lib") {
+                description = getDiagnosticText(option.description);
+                var element = option.element;
+                var typeMap = element.type;
+                optionsDescriptionMap.set(description, ts.arrayFrom(typeMap.keys()).map(function (key) { return "'" + key + "'"; }));
+            }
+            else {
+                description = getDiagnosticText(option.description);
+            }
+            descriptionColumn.push(description);
+            // Set the new margin for the description column if necessary.
+            marginLength = Math.max(usageText_1.length, marginLength);
+        }
+        // Special case that can't fit in the loop.
+        var usageText = " @<" + getDiagnosticText(ts.Diagnostics.file) + ">";
+        usageColumn.push(usageText);
+        descriptionColumn.push(getDiagnosticText(ts.Diagnostics.Insert_command_line_options_and_files_from_a_file));
+        marginLength = Math.max(usageText.length, marginLength);
+        // Print out each row, aligning all the descriptions on the same column.
+        for (var i = 0; i < usageColumn.length; i++) {
+            var usage = usageColumn[i];
+            var description = descriptionColumn[i];
+            var kindsList = optionsDescriptionMap.get(description);
+            output.push(usage + makePadding(marginLength - usage.length + 2) + description + ts.sys.newLine);
+            if (kindsList) {
+                output.push(makePadding(marginLength + 4));
+                for (var _a = 0, kindsList_1 = kindsList; _a < kindsList_1.length; _a++) {
+                    var kind = kindsList_1[_a];
+                    output.push(kind + " ");
+                }
+                output.push(ts.sys.newLine);
+            }
+        }
+        for (var _b = 0, output_1 = output; _b < output_1.length; _b++) {
+            var line = output_1[_b];
+            ts.sys.write(line);
+        }
+        return;
+        function getParamType(option) {
+            if (option.paramType !== undefined) {
+                return " " + getDiagnosticText(option.paramType);
+            }
+            return "";
+        }
+        function makePadding(paddingLength) {
+            return Array(paddingLength + 1).join(" ");
+        }
+    }
+    ts.printHelp = printHelp;
+    /**
+     * Reads the config file, reports errors if any and exits if the config file cannot be found
+     */
     function getParsedCommandLineOfConfigFile(configFileName, optionsToExtend, host) {
         var configFileText;
         try {
@@ -18405,11 +23031,20 @@ var ts;
         return parseJsonSourceFileConfigFileContent(result, host, ts.getNormalizedAbsolutePath(ts.getDirectoryPath(configFileName), cwd), optionsToExtend, ts.getNormalizedAbsolutePath(configFileName, cwd));
     }
     ts.getParsedCommandLineOfConfigFile = getParsedCommandLineOfConfigFile;
+    /**
+     * Read tsconfig.json file
+     * @param fileName The path to the config file
+     */
     function readConfigFile(fileName, readFile) {
         var textOrDiagnostic = tryReadFile(fileName, readFile);
         return ts.isString(textOrDiagnostic) ? parseConfigFileTextToJson(fileName, textOrDiagnostic) : { config: {}, error: textOrDiagnostic };
     }
     ts.readConfigFile = readConfigFile;
+    /**
+     * Parse the text of the tsconfig.json file
+     * @param fileName The path to the config file
+     * @param jsonText The text of the config file
+     */
     function parseConfigFileTextToJson(fileName, jsonText) {
         var jsonSourceFile = ts.parseJsonText(fileName, jsonText);
         return {
@@ -18418,6 +23053,10 @@ var ts;
         };
     }
     ts.parseConfigFileTextToJson = parseConfigFileTextToJson;
+    /**
+     * Read tsconfig.json file
+     * @param fileName The path to the config file
+     */
     function readJsonConfigFile(fileName, readFile) {
         var textOrDiagnostic = tryReadFile(fileName, readFile);
         return ts.isString(textOrDiagnostic) ? ts.parseJsonText(fileName, textOrDiagnostic) : { parseDiagnostics: [textOrDiagnostic] };
@@ -18503,10 +23142,19 @@ var ts;
         }
         return _tsconfigRootOptions;
     }
+    /**
+     * Convert the json syntax tree into the json value
+     */
     function convertToObject(sourceFile, errors) {
-        return convertToObjectWorker(sourceFile, errors, true, undefined, undefined);
+        return convertToObjectWorker(sourceFile, errors, /*returnValue*/ true, /*knownRootOptions*/ undefined, /*jsonConversionNotifier*/ undefined);
     }
     ts.convertToObject = convertToObject;
+    /**
+     * Convert the json syntax tree into the json value and report errors
+     * This returns the json value (apart from checking errors) only if returnValue provided is true.
+     * Otherwise it just checks the errors and returns undefined
+     */
+    /*@internal*/
     function convertToObjectWorker(sourceFile, errors, returnValue, knownRootOptions, jsonConversionNotifier) {
         if (!sourceFile.statements.length) {
             return returnValue ? {} : undefined;
@@ -18519,7 +23167,7 @@ var ts;
             var result = returnValue ? {} : undefined;
             for (var _i = 0, _a = node.properties; _i < _a.length; _i++) {
                 var element = _a[_i];
-                if (element.kind !== 270) {
+                if (element.kind !== 270 /* PropertyAssignment */) {
                     errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, element, ts.Diagnostics.Property_assignment_expected));
                     continue;
                 }
@@ -18539,19 +23187,24 @@ var ts;
                     if (returnValue) {
                         result[keyText] = value;
                     }
+                    // Notify key value set, if user asked for it
                     if (jsonConversionNotifier &&
+                        // Current callbacks are only on known parent option or if we are setting values in the root
                         (parentOption || isRootOptionMap(knownOptions))) {
                         var isValidOptionValue = isCompilerOptionsValue(option, value);
                         if (parentOption) {
                             if (isValidOptionValue) {
+                                // Notify option set in the parent if its a valid option value
                                 jsonConversionNotifier.onSetValidOptionKeyValueInParent(parentOption, option, value);
                             }
                         }
                         else if (isRootOptionMap(knownOptions)) {
                             if (isValidOptionValue) {
+                                // Notify about the valid root key value being set
                                 jsonConversionNotifier.onSetValidOptionKeyValueInRoot(keyText, element.name, value, element.initializer);
                             }
                             else if (!option) {
+                                // Notify about the unknown root key value being set
                                 jsonConversionNotifier.onSetUnknownOptionKeyValueInRoot(keyText, element.name, value, element.initializer);
                             }
                         }
@@ -18565,16 +23218,16 @@ var ts;
         }
         function convertPropertyValueToJson(valueExpression, option) {
             switch (valueExpression.kind) {
-                case 101:
+                case 101 /* TrueKeyword */:
                     reportInvalidOptionValue(option && option.type !== "boolean");
                     return true;
-                case 86:
+                case 86 /* FalseKeyword */:
                     reportInvalidOptionValue(option && option.type !== "boolean");
                     return false;
-                case 95:
-                    reportInvalidOptionValue(option && option.name === "extends");
-                    return null;
-                case 9:
+                case 95 /* NullKeyword */:
+                    reportInvalidOptionValue(option && option.name === "extends"); // "extends" is the only option we don't allow null/undefined for
+                    return null; // tslint:disable-line:no-null-keyword
+                case 9 /* StringLiteral */:
                     if (!isDoubleQuotedString(valueExpression)) {
                         errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, valueExpression, ts.Diagnostics.String_literal_with_double_quotes_expected));
                     }
@@ -18582,36 +23235,45 @@ var ts;
                     var text = valueExpression.text;
                     if (option && !ts.isString(option.type)) {
                         var customOption = option;
+                        // Validate custom option type
                         if (!customOption.type.has(text.toLowerCase())) {
                             errors.push(createDiagnosticForInvalidCustomType(customOption, function (message, arg0, arg1) { return ts.createDiagnosticForNodeInSourceFile(sourceFile, valueExpression, message, arg0, arg1); }));
                         }
                     }
                     return text;
-                case 8:
+                case 8 /* NumericLiteral */:
                     reportInvalidOptionValue(option && option.type !== "number");
                     return Number(valueExpression.text);
-                case 198:
-                    if (valueExpression.operator !== 38 || valueExpression.operand.kind !== 8) {
-                        break;
+                case 198 /* PrefixUnaryExpression */:
+                    if (valueExpression.operator !== 38 /* MinusToken */ || valueExpression.operand.kind !== 8 /* NumericLiteral */) {
+                        break; // not valid JSON syntax
                     }
                     reportInvalidOptionValue(option && option.type !== "number");
                     return -Number(valueExpression.operand.text);
-                case 184:
+                case 184 /* ObjectLiteralExpression */:
                     reportInvalidOptionValue(option && option.type !== "object");
                     var objectLiteralExpression = valueExpression;
+                    // Currently having element option declaration in the tsconfig with type "object"
+                    // determines if it needs onSetValidOptionKeyValueInParent callback or not
+                    // At moment there are only "compilerOptions", "typeAcquisition" and "typingOptions"
+                    // that satifies it and need it to modify options set in them (for normalizing file paths)
+                    // vs what we set in the json
+                    // If need arises, we can modify this interface and callbacks as needed
                     if (option) {
                         var _a = option, elementOptions = _a.elementOptions, extraKeyDiagnosticMessage = _a.extraKeyDiagnosticMessage, optionName = _a.name;
                         return convertObjectLiteralExpressionToJson(objectLiteralExpression, elementOptions, extraKeyDiagnosticMessage, optionName);
                     }
                     else {
-                        return convertObjectLiteralExpressionToJson(objectLiteralExpression, undefined, undefined, undefined);
+                        return convertObjectLiteralExpressionToJson(objectLiteralExpression, /* knownOptions*/ undefined, 
+                        /*extraKeyDiagnosticMessage */ undefined, /*parentOption*/ undefined);
                     }
-                case 183:
+                case 183 /* ArrayLiteralExpression */:
                     reportInvalidOptionValue(option && option.type !== "list");
                     return convertArrayLiteralExpressionToJson(valueExpression.elements, option && option.element);
             }
+            // Not in expected format
             if (option) {
-                reportInvalidOptionValue(true);
+                reportInvalidOptionValue(/*isError*/ true);
             }
             else {
                 errors.push(ts.createDiagnosticForNodeInSourceFile(sourceFile, valueExpression, ts.Diagnostics.Property_value_can_only_be_string_literal_numeric_literal_true_false_null_object_literal_or_array_literal));
@@ -18636,7 +23298,7 @@ var ts;
     function isCompilerOptionsValue(option, value) {
         if (option) {
             if (isNullOrUndefined(value))
-                return true;
+                return true; // All options are undefinable/nullable
             if (option.type === "list") {
                 return ts.isArray(value);
             }
@@ -18645,12 +23307,19 @@ var ts;
         }
         return false;
     }
+    /**
+     * Generate tsconfig configuration when running command line "--init"
+     * @param options commandlineOptions to be generated into tsconfig.json
+     * @param fileNames array of filenames to be generated into tsconfig.json
+     */
+    /* @internal */
     function generateTSConfig(options, fileNames, newLine) {
         var compilerOptions = ts.extend(options, ts.defaultInitCompilerOptions);
         var compilerOptionsMap = serializeCompilerOptions(compilerOptions);
         return writeConfigurations();
         function getCustomTypeMapOfCommandLineOption(optionDefinition) {
             if (optionDefinition.type === "string" || optionDefinition.type === "number" || optionDefinition.type === "boolean") {
+                // this is of a type CommandLineOptionOfPrimitiveType
                 return undefined;
             }
             else if (optionDefinition.type === "list") {
@@ -18661,6 +23330,7 @@ var ts;
             }
         }
         function getNameOfCompilerOptionValue(value, customTypeMap) {
+            // There is a typeMap associated with this command-line option so use it to map value back to its name
             return ts.forEachEntry(customTypeMap, function (mapValue, key) {
                 if (mapValue === value) {
                     return key;
@@ -18672,6 +23342,8 @@ var ts;
             var optionsNameMap = getOptionNameMap().optionNameMap;
             var _loop_3 = function (name) {
                 if (ts.hasProperty(options, name)) {
+                    // tsconfig only options cannot be specified via command line,
+                    // so we can assume that only types that can appear here string | number | boolean
                     if (optionsNameMap.has(name) && optionsNameMap.get(name).category === ts.Diagnostics.Command_line_Options) {
                         return "continue";
                     }
@@ -18680,13 +23352,16 @@ var ts;
                     if (optionDefinition) {
                         var customTypeMap_1 = getCustomTypeMapOfCommandLineOption(optionDefinition);
                         if (!customTypeMap_1) {
+                            // There is no map associated with this compiler option then use the value as-is
+                            // This is the case if the value is expect to be string, number, boolean or list of string
                             result.set(name, value);
                         }
                         else {
                             if (optionDefinition.type === "list") {
-                                result.set(name, value.map(function (element) { return getNameOfCompilerOptionValue(element, customTypeMap_1); }));
+                                result.set(name, value.map(function (element) { return getNameOfCompilerOptionValue(element, customTypeMap_1); })); // TODO: GH#18217
                             }
                             else {
+                                // There is a typeMap associated with this command-line option so use it to map value back to its name
                                 result.set(name, getNameOfCompilerOptionValue(value, customTypeMap_1));
                             }
                         }
@@ -18719,11 +23394,14 @@ var ts;
         }
         function isAllowedOption(_a) {
             var category = _a.category, name = _a.name;
+            // Skip options which do not have a category or have category `Command_line_Options`
+            // Exclude all possible `Advanced_Options` in tsconfig.json which were NOT defined in command line
             return category !== undefined
                 && category !== ts.Diagnostics.Command_line_Options
                 && (category !== ts.Diagnostics.Advanced_Options || compilerOptionsMap.has(name));
         }
         function writeConfigurations() {
+            // Filter applicable options to place in the file
             var categorizedOptions = ts.createMultiMap();
             for (var _i = 0, optionDeclarations_1 = ts.optionDeclarations; _i < optionDeclarations_1.length; _i++) {
                 var option = optionDeclarations_1[_i];
@@ -18732,6 +23410,7 @@ var ts;
                     categorizedOptions.add(ts.getLocaleSpecificMessage(category), option);
                 }
             }
+            // Serialize all options and their descriptions
             var marginLength = 0;
             var seenKnownKeys = 0;
             var nameColumn = [];
@@ -18757,10 +23436,12 @@ var ts;
                     marginLength = Math.max(optionName.length, marginLength);
                 }
             });
+            // Write the output
             var tab = makePadding(2);
             var result = [];
             result.push("{");
             result.push(tab + "\"compilerOptions\": {");
+            // Print out each row, aligning all the descriptions on the same column.
             for (var i = 0; i < nameColumn.length; i++) {
                 var optionName = nameColumn[i];
                 var description = descriptionColumn[i];
@@ -18782,14 +23463,29 @@ var ts;
         }
     }
     ts.generateTSConfig = generateTSConfig;
+    /**
+     * Parse the contents of a config file (tsconfig.json).
+     * @param json The contents of the config file to parse
+     * @param host Instance of ParseConfigHost used to enumerate files in folder.
+     * @param basePath A root directory to resolve relative path entries in the config
+     *    file to. e.g. outDir
+     */
     function parseJsonConfigFileContent(json, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions) {
-        return parseJsonConfigFileContentWorker(json, undefined, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions);
+        return parseJsonConfigFileContentWorker(json, /*sourceFile*/ undefined, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions);
     }
     ts.parseJsonConfigFileContent = parseJsonConfigFileContent;
+    /**
+     * Parse the contents of a config file (tsconfig.json).
+     * @param jsonNode The contents of the config file to parse
+     * @param host Instance of ParseConfigHost used to enumerate files in folder.
+     * @param basePath A root directory to resolve relative path entries in the config
+     *    file to. e.g. outDir
+     */
     function parseJsonSourceFileConfigFileContent(sourceFile, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions) {
-        return parseJsonConfigFileContentWorker(undefined, sourceFile, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions);
+        return parseJsonConfigFileContentWorker(/*json*/ undefined, sourceFile, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions);
     }
     ts.parseJsonSourceFileConfigFileContent = parseJsonSourceFileConfigFileContent;
+    /*@internal*/
     function setConfigFileInOptions(options, configFile) {
         if (configFile) {
             Object.defineProperty(options, "configFile", { enumerable: false, writable: false, value: configFile });
@@ -18797,11 +23493,23 @@ var ts;
     }
     ts.setConfigFileInOptions = setConfigFileInOptions;
     function isNullOrUndefined(x) {
+        // tslint:disable-next-line:no-null-keyword
         return x === undefined || x === null;
     }
     function directoryOfCombinedPath(fileName, basePath) {
+        // Use the `getNormalizedAbsolutePath` function to avoid canonicalizing the path, as it must remain noncanonical
+        // until consistient casing errors are reported
         return ts.getDirectoryPath(ts.getNormalizedAbsolutePath(fileName, basePath));
     }
+    /**
+     * Parse the contents of a config file from json or json source file (tsconfig.json).
+     * @param json The contents of the config file to parse
+     * @param sourceFile sourceFile corresponding to the Json
+     * @param host Instance of ParseConfigHost used to enumerate files in folder.
+     * @param basePath A root directory to resolve relative path entries in the config
+     *    file to. e.g. outDir
+     * @param resolutionStack Only present for backwards-compatibility. Should be empty.
+     */
     function parseJsonConfigFileContentWorker(json, sourceFile, host, basePath, existingOptions, configFileName, resolutionStack, extraFileExtensions) {
         if (existingOptions === void 0) { existingOptions = {}; }
         if (resolutionStack === void 0) { resolutionStack = []; }
@@ -18901,10 +23609,12 @@ var ts;
             }
         }
     }
+    /*@internal*/
     function isErrorNoInputFiles(error) {
         return error.code === ts.Diagnostics.No_inputs_were_found_in_config_file_0_Specified_include_paths_were_1_and_exclude_paths_were_2.code;
     }
     ts.isErrorNoInputFiles = isErrorNoInputFiles;
+    /*@internal*/
     function getErrorForNoInputFiles(_a, configFileName) {
         var includeSpecs = _a.includeSpecs, excludeSpecs = _a.excludeSpecs;
         return ts.createCompilerDiagnostic(ts.Diagnostics.No_inputs_were_found_in_config_file_0_Specified_include_paths_were_1_and_exclude_paths_were_2, configFileName || "tsconfig.json", JSON.stringify(includeSpecs || []), JSON.stringify(excludeSpecs || []));
@@ -18913,6 +23623,10 @@ var ts;
     function isSuccessfulParsedTsconfig(value) {
         return !!value.options;
     }
+    /**
+     * This *just* extracts options/include/exclude/files out of a config file.
+     * It does *not* resolve the included files.
+     */
     function parseConfig(json, sourceFile, host, basePath, configFileName, resolutionStack, errors) {
         basePath = ts.normalizeSlashes(basePath);
         var resolvedPath = ts.getNormalizedAbsolutePath(configFileName || "", basePath);
@@ -18924,6 +23638,7 @@ var ts;
             parseOwnConfigOfJson(json, host, basePath, configFileName, errors) :
             parseOwnConfigOfJsonSourceFile(sourceFile, host, basePath, configFileName, errors);
         if (ownConfig.extendedConfigPath) {
+            // copy the resolution stack so it is never reused between branches in potential diamond-problem scenarios.
             resolutionStack = resolutionStack.concat([resolvedPath]);
             var extendedConfig = getExtendedConfig(sourceFile, ownConfig.extendedConfigPath, host, basePath, resolutionStack, errors);
             if (extendedConfig && isSuccessfulParsedTsconfig(extendedConfig)) {
@@ -18942,6 +23657,7 @@ var ts;
                     raw_1.compileOnSave = baseRaw_1.compileOnSave;
                 }
                 ownConfig.options = ts.assign({}, extendedConfig.options, ownConfig.options);
+                // TODO extend type typeAcquisition
             }
         }
         return ownConfig;
@@ -18951,6 +23667,8 @@ var ts;
             errors.push(ts.createCompilerDiagnostic(ts.Diagnostics.Unknown_option_excludes_Did_you_mean_exclude));
         }
         var options = convertCompilerOptionsFromJsonWorker(json.compilerOptions, basePath, errors, configFileName);
+        // typingOptions has been deprecated and is only supported for backward compatibility purposes.
+        // It should be removed in future releases - use typeAcquisition instead.
         var typeAcquisition = convertTypeAcquisitionFromJsonWorker(json.typeAcquisition || json.typingOptions, basePath, errors, configFileName);
         json.compileOnSave = convertCompileOnSaveOptionFromJson(json, basePath, errors);
         var extendedConfigPath;
@@ -19000,7 +23718,7 @@ var ts;
                 }
             }
         };
-        var json = convertToObjectWorker(sourceFile, errors, true, getTsconfigRootOptionsMap(), optionsIterator);
+        var json = convertToObjectWorker(sourceFile, errors, /*returnValue*/ true, getTsconfigRootOptionsMap(), optionsIterator);
         if (!typeAcquisition) {
             if (typingOptionstypeAcquisition) {
                 typeAcquisition = (typingOptionstypeAcquisition.enableAutoDiscovery !== undefined) ?
@@ -19019,12 +23737,13 @@ var ts;
     }
     function getExtendsConfigPath(extendedConfig, host, basePath, errors, createDiagnostic) {
         extendedConfig = ts.normalizeSlashes(extendedConfig);
+        // If the path isn't a rooted or relative path, don't try to resolve it (we reserve the right to special case module-id like paths in the future)
         if (!(ts.isRootedDiskPath(extendedConfig) || ts.startsWith(extendedConfig, "./") || ts.startsWith(extendedConfig, "../"))) {
             errors.push(createDiagnostic(ts.Diagnostics.A_path_in_an_extends_option_must_be_relative_or_rooted_but_0_is_not, extendedConfig));
             return undefined;
         }
         var extendedConfigPath = ts.getNormalizedAbsolutePath(extendedConfig, basePath);
-        if (!host.fileExists(extendedConfigPath) && !ts.endsWith(extendedConfigPath, ".json")) {
+        if (!host.fileExists(extendedConfigPath) && !ts.endsWith(extendedConfigPath, ".json" /* Json */)) {
             extendedConfigPath = extendedConfigPath + ".json";
             if (!host.fileExists(extendedConfigPath)) {
                 errors.push(createDiagnostic(ts.Diagnostics.File_0_does_not_exist, extendedConfig));
@@ -19044,11 +23763,12 @@ var ts;
             return undefined;
         }
         var extendedDirname = ts.getDirectoryPath(extendedConfigPath);
-        var extendedConfig = parseConfig(undefined, extendedResult, host, extendedDirname, ts.getBaseFileName(extendedConfigPath), resolutionStack, errors);
+        var extendedConfig = parseConfig(/*json*/ undefined, extendedResult, host, extendedDirname, ts.getBaseFileName(extendedConfigPath), resolutionStack, errors);
         if (sourceFile) {
             (_a = sourceFile.extendedSourceFiles).push.apply(_a, extendedResult.extendedSourceFiles);
         }
         if (isSuccessfulParsedTsconfig(extendedConfig)) {
+            // Update the paths to reflect base path
             var relativeDifference_1 = ts.convertToRelativePath(extendedDirname, basePath, ts.identity);
             var updatePath_1 = function (path) { return ts.isRootedDiskPath(path) ? path : ts.combinePaths(relativeDifference_1, path); };
             var mapPropertiesInRawIfNotUndefined = function (propertyName) {
@@ -19177,31 +23897,118 @@ var ts;
     function trimString(s) {
         return typeof s.trim === "function" ? s.trim() : s.replace(/^[\s]+|[\s]+$/g, "");
     }
+    /**
+     * Tests for a path that ends in a recursive directory wildcard.
+     * Matches **, \**, **\, and \**\, but not a**b.
+     *
+     * NOTE: used \ in place of / above to avoid issues with multiline comments.
+     *
+     * Breakdown:
+     *  (^|\/)      # matches either the beginning of the string or a directory separator.
+     *  \*\*        # matches the recursive directory wildcard "**".
+     *  \/?$        # matches an optional trailing directory separator at the end of the string.
+     */
     var invalidTrailingRecursionPattern = /(^|\/)\*\*\/?$/;
+    /**
+     * Tests for a path where .. appears after a recursive directory wildcard.
+     * Matches **\..\*, **\a\..\*, and **\.., but not ..\**\*
+     *
+     * NOTE: used \ in place of / above to avoid issues with multiline comments.
+     *
+     * Breakdown:
+     *  (^|\/)      # matches either the beginning of the string or a directory separator.
+     *  \*\*\/      # matches a recursive directory wildcard "**" followed by a directory separator.
+     *  (.*\/)?     # optionally matches any number of characters followed by a directory separator.
+     *  \.\.        # matches a parent directory path component ".."
+     *  ($|\/)      # matches either the end of the string or a directory separator.
+     */
     var invalidDotDotAfterRecursiveWildcardPattern = /(^|\/)\*\*\/(.*\/)?\.\.($|\/)/;
+    /**
+     * Tests for a path containing a wildcard character in a directory component of the path.
+     * Matches \*\, \?\, and \a*b\, but not \a\ or \a\*.
+     *
+     * NOTE: used \ in place of / above to avoid issues with multiline comments.
+     *
+     * Breakdown:
+     *  \/          # matches a directory separator.
+     *  [^/]*?      # matches any number of characters excluding directory separators (non-greedy).
+     *  [*?]        # matches either a wildcard character (* or ?)
+     *  [^/]*       # matches any number of characters excluding directory separators (greedy).
+     *  \/          # matches a directory separator.
+     */
     var watchRecursivePattern = /\/[^/]*?[*?][^/]*\//;
+    /**
+     * Matches the portion of a wildcard path that does not contain wildcards.
+     * Matches \a of \a\*, or \a\b\c of \a\b\c\?\d.
+     *
+     * NOTE: used \ in place of / above to avoid issues with multiline comments.
+     *
+     * Breakdown:
+     *  ^                   # matches the beginning of the string
+     *  [^*?]*              # matches any number of non-wildcard characters
+     *  (?=\/[^/]*[*?])     # lookahead that matches a directory separator followed by
+     *                      # a path component that contains at least one wildcard character (* or ?).
+     */
     var wildcardDirectoryPattern = /^[^*?]*(?=\/[^/]*[*?])/;
+    /**
+     * Expands an array of file specifications.
+     *
+     * @param filesSpecs The literal file names to include.
+     * @param includeSpecs The wildcard file specifications to include.
+     * @param excludeSpecs The wildcard file specifications to exclude.
+     * @param basePath The base path for any relative file specifications.
+     * @param options Compiler options.
+     * @param host The host used to resolve files and directories.
+     * @param errors An array for diagnostic reporting.
+     */
     function matchFileNames(filesSpecs, includeSpecs, excludeSpecs, basePath, options, host, errors, extraFileExtensions, jsonSourceFile) {
         basePath = ts.normalizePath(basePath);
         var validatedIncludeSpecs, validatedExcludeSpecs;
+        // The exclude spec list is converted into a regular expression, which allows us to quickly
+        // test whether a file or directory should be excluded before recursively traversing the
+        // file system.
         if (includeSpecs) {
-            validatedIncludeSpecs = validateSpecs(includeSpecs, errors, false, jsonSourceFile, "include");
+            validatedIncludeSpecs = validateSpecs(includeSpecs, errors, /*allowTrailingRecursion*/ false, jsonSourceFile, "include");
         }
         if (excludeSpecs) {
-            validatedExcludeSpecs = validateSpecs(excludeSpecs, errors, true, jsonSourceFile, "exclude");
+            validatedExcludeSpecs = validateSpecs(excludeSpecs, errors, /*allowTrailingRecursion*/ true, jsonSourceFile, "exclude");
         }
+        // Wildcard directories (provided as part of a wildcard path) are stored in a
+        // file map that marks whether it was a regular wildcard match (with a `*` or `?` token),
+        // or a recursive directory. This information is used by filesystem watchers to monitor for
+        // new entries in these paths.
         var wildcardDirectories = getWildcardDirectories(validatedIncludeSpecs, validatedExcludeSpecs, basePath, host.useCaseSensitiveFileNames);
         var spec = { filesSpecs: filesSpecs, referencesSpecs: undefined, includeSpecs: includeSpecs, excludeSpecs: excludeSpecs, validatedIncludeSpecs: validatedIncludeSpecs, validatedExcludeSpecs: validatedExcludeSpecs, wildcardDirectories: wildcardDirectories };
         return getFileNamesFromConfigSpecs(spec, basePath, options, host, extraFileExtensions);
     }
+    /**
+     * Gets the file names from the provided config file specs that contain, files, include, exclude and
+     * other properties needed to resolve the file names
+     * @param spec The config file specs extracted with file names to include, wildcards to include/exclude and other details
+     * @param basePath The base path for any relative file specifications.
+     * @param options Compiler options.
+     * @param host The host used to resolve files and directories.
+     * @param extraFileExtensions optionaly file extra file extension information from host
+     */
+    /* @internal */
     function getFileNamesFromConfigSpecs(spec, basePath, options, host, extraFileExtensions) {
         if (extraFileExtensions === void 0) { extraFileExtensions = []; }
         basePath = ts.normalizePath(basePath);
         var keyMapper = host.useCaseSensitiveFileNames ? ts.identity : ts.toLowerCase;
+        // Literal file names (provided via the "files" array in tsconfig.json) are stored in a
+        // file map with a possibly case insensitive key. We use this map later when when including
+        // wildcard paths.
         var literalFileMap = ts.createMap();
+        // Wildcard paths (provided via the "includes" array in tsconfig.json) are stored in a
+        // file map with a possibly case insensitive key. We use this map to store paths matched
+        // via wildcard, and to handle extension priority.
         var wildcardFileMap = ts.createMap();
         var filesSpecs = spec.filesSpecs, validatedIncludeSpecs = spec.validatedIncludeSpecs, validatedExcludeSpecs = spec.validatedExcludeSpecs, wildcardDirectories = spec.wildcardDirectories;
+        // Rather than requery this for each file and filespec, we query the supported extensions
+        // once and store it on the expansion context.
         var supportedExtensions = ts.getSupportedExtensions(options, extraFileExtensions);
+        // Literal files are always included verbatim. An "include" or "exclude" specification cannot
+        // remove a literal file.
         if (filesSpecs) {
             for (var _i = 0, filesSpecs_1 = filesSpecs; _i < filesSpecs_1.length; _i++) {
                 var fileName = filesSpecs_1[_i];
@@ -19210,11 +24017,21 @@ var ts;
             }
         }
         if (validatedIncludeSpecs && validatedIncludeSpecs.length > 0) {
-            for (var _a = 0, _b = host.readDirectory(basePath, supportedExtensions, validatedExcludeSpecs, validatedIncludeSpecs, undefined); _a < _b.length; _a++) {
+            for (var _a = 0, _b = host.readDirectory(basePath, supportedExtensions, validatedExcludeSpecs, validatedIncludeSpecs, /*depth*/ undefined); _a < _b.length; _a++) {
                 var file = _b[_a];
+                // If we have already included a literal or wildcard path with a
+                // higher priority extension, we should skip this file.
+                //
+                // This handles cases where we may encounter both <file>.ts and
+                // <file>.d.ts (or <file>.js if "allowJs" is enabled) in the same
+                // directory when they are compilation outputs.
                 if (hasFileWithHigherPriorityExtension(file, literalFileMap, wildcardFileMap, supportedExtensions, keyMapper)) {
                     continue;
                 }
+                // We may have included a wildcard path with a lower priority
+                // extension due to the user-defined order of entries in the
+                // "include" array. If there is a lower priority extension in the
+                // same directory, we should remove it.
                 removeWildcardFilesWithLowerPriorityExtension(file, wildcardFileMap, supportedExtensions, keyMapper);
                 var key = keyMapper(file);
                 if (!literalFileMap.has(key) && !wildcardFileMap.has(key)) {
@@ -19258,7 +24075,22 @@ var ts;
             return ts.Diagnostics.File_specification_cannot_contain_a_parent_directory_that_appears_after_a_recursive_directory_wildcard_Asterisk_Asterisk_Colon_0;
         }
     }
+    /**
+     * Gets directories in a set of include patterns that should be watched for changes.
+     */
     function getWildcardDirectories(include, exclude, path, useCaseSensitiveFileNames) {
+        // We watch a directory recursively if it contains a wildcard anywhere in a directory segment
+        // of the pattern:
+        //
+        //  /a/b/**/d   - Watch /a/b recursively to catch changes to any d in any subfolder recursively
+        //  /a/b/*/d    - Watch /a/b recursively to catch any d in any immediate subfolder, even if a new subfolder is added
+        //  /a/b        - Watch /a/b recursively to catch changes to anything in any recursive subfoler
+        //
+        // We watch a directory without recursion if it contains a wildcard in the file segment of
+        // the pattern:
+        //
+        //  /a/b/*      - Watch /a/b directly to catch any new file
+        //  /a/b/a?z    - Watch /a/b directly to catch any new file matching a?z
         var rawExcludeRegex = ts.getRegularExpressionForWildcard(exclude, path, "exclude");
         var excludeRegex = rawExcludeRegex && new RegExp(rawExcludeRegex, useCaseSensitiveFileNames ? "" : "i");
         var wildcardDirectories = {};
@@ -19276,12 +24108,13 @@ var ts;
                     var existingFlags = wildcardDirectories[key];
                     if (existingFlags === undefined || existingFlags < flags) {
                         wildcardDirectories[key] = flags;
-                        if (flags === 1) {
+                        if (flags === 1 /* Recursive */) {
                             recursiveKeys.push(key);
                         }
                     }
                 }
             }
+            // Remove any subpaths under an existing recursively watched directory.
             for (var key in wildcardDirectories) {
                 if (ts.hasProperty(wildcardDirectories, key)) {
                     for (var _a = 0, recursiveKeys_1 = recursiveKeys; _a < recursiveKeys_1.length; _a++) {
@@ -19300,18 +24133,26 @@ var ts;
         if (match) {
             return {
                 key: useCaseSensitiveFileNames ? match[0] : match[0].toLowerCase(),
-                flags: watchRecursivePattern.test(spec) ? 1 : 0
+                flags: watchRecursivePattern.test(spec) ? 1 /* Recursive */ : 0 /* None */
             };
         }
         if (ts.isImplicitGlob(spec)) {
-            return { key: spec, flags: 1 };
+            return { key: spec, flags: 1 /* Recursive */ };
         }
         return undefined;
     }
+    /**
+     * Determines whether a literal or wildcard file has already been included that has a higher
+     * extension priority.
+     *
+     * @param file The path to the file.
+     * @param extensionPriority The priority of the extension.
+     * @param context The expansion context.
+     */
     function hasFileWithHigherPriorityExtension(file, literalFiles, wildcardFiles, extensions, keyMapper) {
         var extensionPriority = ts.getExtensionPriority(file, extensions);
         var adjustedExtensionPriority = ts.adjustExtensionPriority(extensionPriority, extensions);
-        for (var i = 0; i < adjustedExtensionPriority; i++) {
+        for (var i = 0 /* Highest */; i < adjustedExtensionPriority; i++) {
             var higherPriorityExtension = extensions[i];
             var higherPriorityPath = keyMapper(ts.changeExtension(file, higherPriorityExtension));
             if (literalFiles.has(higherPriorityPath) || wildcardFiles.has(higherPriorityPath)) {
@@ -19320,6 +24161,14 @@ var ts;
         }
         return false;
     }
+    /**
+     * Removes files included via wildcard expansion with a lower extension priority that have
+     * already been included.
+     *
+     * @param file The path to the file.
+     * @param extensionPriority The priority of the extension.
+     * @param context The expansion context.
+     */
     function removeWildcardFilesWithLowerPriorityExtension(file, wildcardFiles, extensions, keyMapper) {
         var extensionPriority = ts.getExtensionPriority(file, extensions);
         var nextExtensionPriority = ts.getNextLowestExtensionPriority(extensionPriority, extensions);
@@ -19329,12 +24178,17 @@ var ts;
             wildcardFiles.delete(lowerPriorityPath);
         }
     }
+    /**
+     * Produces a cleaned version of compiler options with personally identifiying info (aka, paths) removed.
+     * Also converts enum values back to strings.
+     */
+    /* @internal */
     function convertCompilerOptionsForTelemetry(opts) {
         var out = {};
         for (var key in opts) {
             if (opts.hasOwnProperty(key)) {
                 var type = getOptionFromName(key);
-                if (type !== undefined) {
+                if (type !== undefined) { // Ignore unknown options
                     out[key] = getOptionValueWithEmptyStrings(opts[key], type);
                 }
             }
@@ -19344,11 +24198,11 @@ var ts;
     ts.convertCompilerOptionsForTelemetry = convertCompilerOptionsForTelemetry;
     function getOptionValueWithEmptyStrings(value, option) {
         switch (option.type) {
-            case "object":
+            case "object": // "paths". Can't get any useful information from the value since we blank out strings, so just return "".
                 return "";
-            case "string":
+            case "string": // Could be any arbitrary string -- use empty string instead.
                 return "";
-            case "number":
+            case "number": // Allow numbers, but be sure to check it's actually a number.
                 return typeof value === "number" ? value : "";
             case "boolean":
                 return typeof value === "boolean" ? value : "";
@@ -19360,7 +24214,7 @@ var ts;
                     if (optionEnumValue === value) {
                         return optionStringValue;
                     }
-                });
+                }); // TODO: GH#18217
         }
     }
 })(ts || (ts = {}));
@@ -19370,6 +24224,7 @@ var ts;
         host.trace(ts.formatMessage.apply(undefined, arguments));
     }
     ts.trace = trace;
+    /* @internal */
     function isTraceEnabled(compilerOptions, host) {
         return !!compilerOptions.traceResolution && host.trace !== undefined;
     }
@@ -19378,15 +24233,20 @@ var ts;
         return r && { path: r.path, extension: r.ext, packageId: packageId };
     }
     function noPackageId(r) {
-        return withPackageId(undefined, r);
+        return withPackageId(/*packageId*/ undefined, r);
     }
+    /**
+     * Kinds of file that we are currently looking for.
+     * Typically there is one pass with Extensions.TypeScript, then a second pass with Extensions.JavaScript.
+     */
     var Extensions;
     (function (Extensions) {
         Extensions[Extensions["TypeScript"] = 0] = "TypeScript";
         Extensions[Extensions["JavaScript"] = 1] = "JavaScript";
         Extensions[Extensions["Json"] = 2] = "Json";
-        Extensions[Extensions["DtsOnly"] = 3] = "DtsOnly";
+        Extensions[Extensions["DtsOnly"] = 3] = "DtsOnly"; /** Only '.d.ts' */
     })(Extensions || (Extensions = {}));
+    /** Used with `Extensions.DtsOnly` to extract the path from TypeScript results. */
     function resolvedTypeScriptOnly(resolved) {
         if (!resolved) {
             return undefined;
@@ -19400,6 +24260,7 @@ var ts;
             failedLookupLocations: failedLookupLocations
         };
     }
+    /** Reads from "main" or "types"/"typings" depending on `extensions`. */
     function tryReadPackageJsonFields(readTypes, jsonContent, baseDirectory, state) {
         return readTypes ? tryReadFromField("typings") || tryReadFromField("types") : tryReadFromField("main");
         function tryReadFromField(fieldName) {
@@ -19423,6 +24284,7 @@ var ts;
             return path;
         }
     }
+    /* @internal */
     function readJson(path, host) {
         try {
             var jsonText = host.readFile(path);
@@ -19435,6 +24297,7 @@ var ts;
             return result.config;
         }
         catch (e) {
+            // gracefully handle if readFile fails or returns not JSON
             return {};
         }
     }
@@ -19455,9 +24318,14 @@ var ts;
         }
     }
     ts.getEffectiveTypeRoots = getEffectiveTypeRoots;
+    /**
+     * Returns the path to every node_modules/@types directory from some ancestor directory.
+     * Returns undefined if there are none.
+     */
     function getDefaultTypeRoots(currentDirectory, host) {
         if (!host.directoryExists) {
             return [ts.combinePaths(currentDirectory, nodeModulesAtTypes)];
+            // And if it doesn't exist, tough.
         }
         var typeRoots;
         ts.forEachAncestorDirectory(ts.normalizePath(currentDirectory), function (directory) {
@@ -19470,6 +24338,11 @@ var ts;
         return typeRoots;
     }
     var nodeModulesAtTypes = ts.combinePaths("node_modules", "@types");
+    /**
+     * @param {string | undefined} containingFile - file that contains type reference directive, can be undefined if containing file is unknown.
+     * This is possible in case if resolution is performed for directives specified via 'types' parameter. In this case initial path for secondary lookups
+     * is assumed to be the same as root directory of the project.
+     */
     function resolveTypeReferenceDirective(typeReferenceDirectiveName, containingFile, options, host) {
         var traceEnabled = isTraceEnabled(options, host);
         var moduleResolutionState = { compilerOptions: options, host: host, traceEnabled: traceEnabled };
@@ -19511,6 +24384,7 @@ var ts;
         }
         return { resolvedTypeReferenceDirective: resolvedTypeReferenceDirective, failedLookupLocations: failedLookupLocations };
         function primaryLookup() {
+            // Check primary library paths
             if (typeRoots && typeRoots.length) {
                 if (traceEnabled) {
                     trace(host, ts.Diagnostics.Resolving_with_primary_search_path_0, typeRoots.join(", "));
@@ -19534,10 +24408,11 @@ var ts;
         function secondaryLookup() {
             var initialLocationForSecondaryLookup = containingFile && ts.getDirectoryPath(containingFile);
             if (initialLocationForSecondaryLookup !== undefined) {
+                // check secondary locations
                 if (traceEnabled) {
                     trace(host, ts.Diagnostics.Looking_up_in_node_modules_folder_initial_location_0, initialLocationForSecondaryLookup);
                 }
-                var result = loadModuleFromNodeModules(Extensions.DtsOnly, typeReferenceDirectiveName, initialLocationForSecondaryLookup, failedLookupLocations, moduleResolutionState, undefined);
+                var result = loadModuleFromNodeModules(Extensions.DtsOnly, typeReferenceDirectiveName, initialLocationForSecondaryLookup, failedLookupLocations, moduleResolutionState, /*cache*/ undefined);
                 var resolvedFile = resolvedTypeScriptOnly(result && result.value);
                 if (!resolvedFile && traceEnabled) {
                     trace(host, ts.Diagnostics.Type_reference_directive_0_was_not_resolved, typeReferenceDirectiveName);
@@ -19552,10 +24427,20 @@ var ts;
         }
     }
     ts.resolveTypeReferenceDirective = resolveTypeReferenceDirective;
+    /**
+     * Given a set of options, returns the set of type directive names
+     *   that should be included for this program automatically.
+     * This list could either come from the config file,
+     *   or from enumerating the types root + initial secondary types lookup location.
+     * More type directives might appear in the program later as a result of loading actual source files;
+     *   this list is only the set of defaults that are implicitly included.
+     */
     function getAutomaticTypeDirectiveNames(options, host) {
+        // Use explicit type list from tsconfig.json
         if (options.types) {
             return options.types;
         }
+        // Walk the primary type lookup locations
         var result = [];
         if (host.directoryExists && host.getDirectories) {
             var typeRoots = getEffectiveTypeRoots(options, host);
@@ -19567,8 +24452,12 @@ var ts;
                             var typeDirectivePath = _b[_a];
                             var normalized = ts.normalizePath(typeDirectivePath);
                             var packageJsonPath = pathToPackageJson(ts.combinePaths(root, normalized));
+                            // `types-publisher` sometimes creates packages with `"typings": null` for packages that don't provide their own types.
+                            // See `createNotNeededPackageJSON` in the types-publisher` repo.
+                            // tslint:disable-next-line:no-null-keyword
                             var isNotNeededPackage = host.fileExists(packageJsonPath) && readJson(packageJsonPath, host).typings === null;
                             if (!isNotNeededPackage) {
+                                // Return just the type directive names
                                 result.push(ts.getBaseFileName(normalized));
                             }
                         }
@@ -19583,6 +24472,7 @@ var ts;
         return createModuleResolutionCacheWithMaps(ts.createMap(), ts.createMap(), currentDirectory, getCanonicalFileName);
     }
     ts.createModuleResolutionCache = createModuleResolutionCache;
+    /*@internal*/
     function createModuleResolutionCacheWithMaps(directoryToModuleNameMap, moduleNameToDirectoryMap, currentDirectory, getCanonicalFileName) {
         return { getOrCreateCacheForDirectory: getOrCreateCacheForDirectory, getOrCreateCacheForModuleName: getOrCreateCacheForModuleName };
         function getOrCreateCacheForDirectory(directoryName) {
@@ -19596,7 +24486,7 @@ var ts;
         }
         function getOrCreateCacheForModuleName(nonRelativeModuleName) {
             if (ts.isExternalModuleNameRelative(nonRelativeModuleName)) {
-                return undefined;
+                return undefined; // TODO: GH#18217
             }
             var perModuleNameCache = moduleNameToDirectoryMap.get(nonRelativeModuleName);
             if (!perModuleNameCache) {
@@ -19611,13 +24501,29 @@ var ts;
             function get(directory) {
                 return directoryPathMap.get(ts.toPath(directory, currentDirectory, getCanonicalFileName));
             }
+            /**
+             * At first this function add entry directory -> module resolution result to the table.
+             * Then it computes the set of parent folders for 'directory' that should have the same module resolution result
+             * and for every parent folder in set it adds entry: parent -> module resolution. .
+             * Lets say we first directory name: /a/b/c/d/e and resolution result is: /a/b/bar.ts.
+             * Set of parent folders that should have the same result will be:
+             * [
+             *     /a/b/c/d, /a/b/c, /a/b
+             * ]
+             * this means that request for module resolution from file in any of these folder will be immediately found in cache.
+             */
             function set(directory, result) {
                 var path = ts.toPath(directory, currentDirectory, getCanonicalFileName);
+                // if entry is already in cache do nothing
                 if (directoryPathMap.has(path)) {
                     return;
                 }
                 directoryPathMap.set(path, result);
                 var resolvedFileName = result.resolvedModule && result.resolvedModule.resolvedFileName;
+                // find common prefix between directory and resolved file name
+                // this common prefix should be the shorted path that has the same resolution
+                // directory: /a/b/c/d/e
+                // resolvedFileName: /a/b/foo.d.ts
                 var commonPrefix = getCommonPrefix(path, resolvedFileName);
                 var current = path;
                 while (true) {
@@ -19637,10 +24543,12 @@ var ts;
                     return undefined;
                 }
                 var resolutionDirectory = ts.toPath(ts.getDirectoryPath(resolution), currentDirectory, getCanonicalFileName);
+                // find first position where directory and resolution differs
                 var i = 0;
                 while (i < Math.min(directory.length, resolutionDirectory.length) && directory.charCodeAt(i) === resolutionDirectory.charCodeAt(i)) {
                     i++;
                 }
+                // find last directory separator before position i
                 var sep = directory.lastIndexOf(ts.directorySeparator, i);
                 if (sep < 0) {
                     return undefined;
@@ -19694,6 +24602,7 @@ var ts;
             }
             if (perFolderCache) {
                 perFolderCache.set(moduleName, result);
+                // put result in per-module name cache
                 var perModuleNameCache = cache.getOrCreateCacheForModuleName(moduleName);
                 if (perModuleNameCache) {
                     perModuleNameCache.set(containingDirectory, result);
@@ -19711,6 +24620,66 @@ var ts;
         return result;
     }
     ts.resolveModuleName = resolveModuleName;
+    /**
+     * Any module resolution kind can be augmented with optional settings: 'baseUrl', 'paths' and 'rootDirs' - they are used to
+     * mitigate differences between design time structure of the project and its runtime counterpart so the same import name
+     * can be resolved successfully by TypeScript compiler and runtime module loader.
+     * If these settings are set then loading procedure will try to use them to resolve module name and it can of failure it will
+     * fallback to standard resolution routine.
+     *
+     * - baseUrl - this setting controls how non-relative module names are resolved. If this setting is specified then non-relative
+     * names will be resolved relative to baseUrl: i.e. if baseUrl is '/a/b' then candidate location to resolve module name 'c/d' will
+     * be '/a/b/c/d'
+     * - paths - this setting can only be used when baseUrl is specified. allows to tune how non-relative module names
+     * will be resolved based on the content of the module name.
+     * Structure of 'paths' compiler options
+     * 'paths': {
+     *    pattern-1: [...substitutions],
+     *    pattern-2: [...substitutions],
+     *    ...
+     *    pattern-n: [...substitutions]
+     * }
+     * Pattern here is a string that can contain zero or one '*' character. During module resolution module name will be matched against
+     * all patterns in the list. Matching for patterns that don't contain '*' means that module name must be equal to pattern respecting the case.
+     * If pattern contains '*' then to match pattern "<prefix>*<suffix>" module name must start with the <prefix> and end with <suffix>.
+     * <MatchedStar> denotes part of the module name between <prefix> and <suffix>.
+     * If module name can be matches with multiple patterns then pattern with the longest prefix will be picked.
+     * After selecting pattern we'll use list of substitutions to get candidate locations of the module and the try to load module
+     * from the candidate location.
+     * Substitution is a string that can contain zero or one '*'. To get candidate location from substitution we'll pick every
+     * substitution in the list and replace '*' with <MatchedStar> string. If candidate location is not rooted it
+     * will be converted to absolute using baseUrl.
+     * For example:
+     * baseUrl: /a/b/c
+     * "paths": {
+     *     // match all module names
+     *     "*": [
+     *         "*",        // use matched name as is,
+     *                     // <matched name> will be looked as /a/b/c/<matched name>
+     *
+     *         "folder1/*" // substitution will convert matched name to 'folder1/<matched name>',
+     *                     // since it is not rooted then final candidate location will be /a/b/c/folder1/<matched name>
+     *     ],
+     *     // match module names that start with 'components/'
+     *     "components/*": [ "/root/components/*" ] // substitution will convert /components/folder1/<matched name> to '/root/components/folder1/<matched name>',
+     *                                              // it is rooted so it will be final candidate location
+     * }
+     *
+     * 'rootDirs' allows the project to be spreaded across multiple locations and resolve modules with relative names as if
+     * they were in the same location. For example lets say there are two files
+     * '/local/src/content/file1.ts'
+     * '/shared/components/contracts/src/content/protocols/file2.ts'
+     * After bundling content of '/shared/components/contracts/src' will be merged with '/local/src' so
+     * if file1 has the following import 'import {x} from "./protocols/file2"' it will be resolved successfully in runtime.
+     * 'rootDirs' provides the way to tell compiler that in order to get the whole project it should behave as if content of all
+     * root dirs were merged together.
+     * I.e. for the example above 'rootDirs' will have two entries: [ '/local/src', '/shared/components/contracts/src' ].
+     * Compiler will first convert './protocols/file2' into absolute path relative to the location of containing file:
+     * '/local/src/content/protocols/file2' and try to load it - failure.
+     * Then it will search 'rootDirs' looking for a longest matching prefix of this absolute path and if such prefix is found - absolute path will
+     * be converted to a path relative to found rootDir entry './content/protocols/file2' (*). As a last step compiler will check all remaining
+     * entries in 'rootDirs', use them to build absolute path out of (*) and try to resolve module from this location.
+     */
     function tryLoadModuleUsingOptionalResolutionSettings(extensions, moduleName, containingDirectory, loader, failedLookupLocations, state) {
         if (!ts.isExternalModuleNameRelative(moduleName)) {
             return tryLoadModuleUsingBaseUrl(extensions, moduleName, loader, failedLookupLocations, state);
@@ -19731,6 +24700,9 @@ var ts;
         var matchedNormalizedPrefix;
         for (var _i = 0, _a = state.compilerOptions.rootDirs; _i < _a.length; _i++) {
             var rootDir = _a[_i];
+            // rootDirs are expected to be absolute
+            // in case of tsconfig.json this will happen automatically - compiler will expand relative names
+            // using location of tsconfig.json as base location
             var normalizedRoot = ts.normalizePath(rootDir);
             if (!ts.endsWith(normalizedRoot, ts.directorySeparator)) {
                 normalizedRoot += ts.directorySeparator;
@@ -19750,6 +24722,7 @@ var ts;
                 trace(state.host, ts.Diagnostics.Longest_matching_prefix_for_0_is_1, candidate, matchedNormalizedPrefix);
             }
             var suffix = candidate.substr(matchedNormalizedPrefix.length);
+            // first - try to load from a initial location
             if (state.traceEnabled) {
                 trace(state.host, ts.Diagnostics.Loading_0_from_the_root_dir_1_candidate_location_2, suffix, matchedNormalizedPrefix, candidate);
             }
@@ -19760,9 +24733,11 @@ var ts;
             if (state.traceEnabled) {
                 trace(state.host, ts.Diagnostics.Trying_other_entries_in_rootDirs);
             }
+            // then try to resolve using remaining entries in rootDirs
             for (var _b = 0, _c = state.compilerOptions.rootDirs; _b < _c.length; _b++) {
                 var rootDir = _c[_b];
                 if (rootDir === matchedRootDir) {
+                    // skip the initially matched entry
                     continue;
                 }
                 var candidate_1 = ts.combinePaths(ts.normalizePath(rootDir), suffix);
@@ -19788,6 +24763,7 @@ var ts;
         if (state.traceEnabled) {
             trace(state.host, ts.Diagnostics.baseUrl_option_is_set_to_0_using_this_value_to_resolve_non_relative_module_name_1, state.compilerOptions.baseUrl, moduleName);
         }
+        // string is for exact match
         var matchedPattern;
         if (state.compilerOptions.paths) {
             if (state.traceEnabled) {
@@ -19807,9 +24783,10 @@ var ts;
                 if (state.traceEnabled) {
                     trace(state.host, ts.Diagnostics.Trying_substitution_0_candidate_module_location_Colon_1, subst, path);
                 }
+                // A path mapping may have an extension, in contrast to an import, which should omit it.
                 var extension = ts.tryGetExtensionFromPath(candidate);
                 if (extension !== undefined) {
-                    var path_1 = tryFile(candidate, failedLookupLocations, false, state);
+                    var path_1 = tryFile(candidate, failedLookupLocations, /*onlyRecordFailures*/ false, state);
                     if (path_1 !== undefined) {
                         return noPackageId({ path: path_1, ext: extension });
                     }
@@ -19826,11 +24803,17 @@ var ts;
         }
     }
     function nodeModuleNameResolver(moduleName, containingFile, compilerOptions, host, cache) {
-        return nodeModuleNameResolverWorker(moduleName, ts.getDirectoryPath(containingFile), compilerOptions, host, cache, false);
+        return nodeModuleNameResolverWorker(moduleName, ts.getDirectoryPath(containingFile), compilerOptions, host, cache, /*jsOnly*/ false);
     }
     ts.nodeModuleNameResolver = nodeModuleNameResolver;
+    /**
+     * Expose resolution logic to allow us to use Node module resolution logic from arbitrary locations.
+     * No way to do this with `require()`: https://github.com/nodejs/node/issues/5963
+     * Throws an error if the module can't be resolved.
+     */
+    /* @internal */
     function resolveJavaScriptModule(moduleName, initialDir, host) {
-        var _a = nodeModuleNameResolverWorker(moduleName, initialDir, { moduleResolution: ts.ModuleResolutionKind.NodeJs, allowJs: true }, host, undefined, true), resolvedModule = _a.resolvedModule, failedLookupLocations = _a.failedLookupLocations;
+        var _a = nodeModuleNameResolverWorker(moduleName, initialDir, { moduleResolution: ts.ModuleResolutionKind.NodeJs, allowJs: true }, host, /*cache*/ undefined, /*jsOnly*/ true), resolvedModule = _a.resolvedModule, failedLookupLocations = _a.failedLookupLocations;
         if (!resolvedModule) {
             throw new Error("Could not resolve JS module '" + moduleName + "' starting at '" + initialDir + "'. Looked in: " + failedLookupLocations.join(", "));
         }
@@ -19852,7 +24835,7 @@ var ts;
         }
         return { resolvedModule: undefined, failedLookupLocations: failedLookupLocations };
         function tryResolve(extensions) {
-            var loader = function (extensions, candidate, failedLookupLocations, onlyRecordFailures, state) { return nodeLoadModuleByRelativeName(extensions, candidate, failedLookupLocations, onlyRecordFailures, state, true); };
+            var loader = function (extensions, candidate, failedLookupLocations, onlyRecordFailures, state) { return nodeLoadModuleByRelativeName(extensions, candidate, failedLookupLocations, onlyRecordFailures, state, /*considerPackageJson*/ true); };
             var resolved = tryLoadModuleUsingOptionalResolutionSettings(extensions, moduleName, containingDirectory, loader, failedLookupLocations, state);
             if (resolved) {
                 return toSearchResult({ resolved: resolved, isExternalLibraryImport: false });
@@ -19874,11 +24857,13 @@ var ts;
                     }
                     resolvedValue = __assign({}, resolvedValue, { path: path });
                 }
+                // For node_modules lookups, get the real path so that multiple accesses to an `npm link`-ed module do not create duplicate files.
                 return { value: resolvedValue && { resolved: resolvedValue, originalPath: originalPath, isExternalLibraryImport: true } };
             }
             else {
                 var _a = ts.normalizePathAndParts(ts.combinePaths(containingDirectory, moduleName)), candidate = _a.path, parts = _a.parts;
-                var resolved_2 = nodeLoadModuleByRelativeName(extensions, candidate, failedLookupLocations, false, state, true);
+                var resolved_2 = nodeLoadModuleByRelativeName(extensions, candidate, failedLookupLocations, /*onlyRecordFailures*/ false, state, /*considerPackageJson*/ true);
+                // Treat explicit "node_modules" import as an external library import.
                 return resolved_2 && toSearchResult({ resolved: resolved_2, isExternalLibraryImport: ts.contains(parts, "node_modules") });
             }
         }
@@ -19891,7 +24876,7 @@ var ts;
         if (traceEnabled) {
             trace(host, ts.Diagnostics.Resolving_real_path_for_0_result_1, path, real);
         }
-        ts.Debug.assert(host.fileExists(real), path + " linked to nonexistent file " + real);
+        ts.Debug.assert(host.fileExists(real), path + " linked to nonexistent file " + real); // tslint:disable-line
         return real;
     }
     function nodeLoadModuleByRelativeName(extensions, candidate, failedLookupLocations, onlyRecordFailures, state, considerPackageJson) {
@@ -19911,7 +24896,7 @@ var ts;
             var resolvedFromFile = loadModuleFromFile(extensions, candidate, failedLookupLocations, onlyRecordFailures, state);
             if (resolvedFromFile) {
                 var nm = considerPackageJson ? parseNodeModuleFromPath(resolvedFromFile) : undefined;
-                var packageId = nm && getPackageJsonInfo(nm.packageDirectory, nm.subModuleName, failedLookupLocations, false, state).packageId;
+                var packageId = nm && getPackageJsonInfo(nm.packageDirectory, nm.subModuleName, failedLookupLocations, /*onlyRecordFailures*/ false, state).packageId;
                 return withPackageId(packageId, resolvedFromFile);
             }
         }
@@ -19927,6 +24912,17 @@ var ts;
         return loadNodeModuleFromDirectory(extensions, candidate, failedLookupLocations, onlyRecordFailures, state, considerPackageJson);
     }
     var nodeModulesPathPart = "/node_modules/";
+    /**
+     * This will be called on the successfully resolved path from `loadModuleFromFile`.
+     * (Not neeeded for `loadModuleFromNodeModules` as that looks up the `package.json` as part of resolution.)
+     *
+     * packageDirectory is the directory of the package itself.
+     * subModuleName is the path within the package.
+     *   For `blah/node_modules/foo/index.d.ts` this is { packageDirectory: "foo", subModuleName: "index.d.ts" }. (Part before "/node_modules/" is ignored.)
+     *   For `/node_modules/foo/bar.d.ts` this is { packageDirectory: "foo", subModuleName": "bar/index.d.ts" }.
+     *   For `/node_modules/@types/foo/bar/index.d.ts` this is { packageDirectory: "@types/foo", subModuleName: "bar/index.d.ts" }.
+     *   For `/node_modules/foo/bar/index.d.ts` this is { packageDirectory: "foo", subModuleName": "bar/index.d.ts" }.
+     */
     function parseNodeModuleFromPath(resolved) {
         var path = ts.normalizePath(resolved.path);
         var idx = path.lastIndexOf(nodeModulesPathPart);
@@ -19935,11 +24931,11 @@ var ts;
         }
         var indexAfterNodeModules = idx + nodeModulesPathPart.length;
         var indexAfterPackageName = moveToNextDirectorySeparatorIfAvailable(path, indexAfterNodeModules);
-        if (path.charCodeAt(indexAfterNodeModules) === 64) {
+        if (path.charCodeAt(indexAfterNodeModules) === 64 /* at */) {
             indexAfterPackageName = moveToNextDirectorySeparatorIfAvailable(path, indexAfterPackageName);
         }
         var packageDirectory = path.slice(0, indexAfterPackageName);
-        var subModuleName = ts.removeExtension(path.slice(indexAfterPackageName + 1), resolved.ext) + ".d.ts";
+        var subModuleName = ts.removeExtension(path.slice(indexAfterPackageName + 1), resolved.ext) + ".d.ts" /* Dts */;
         return { packageDirectory: packageDirectory, subModuleName: subModuleName };
     }
     function moveToNextDirectorySeparatorIfAvailable(path, prevSeparatorIndex) {
@@ -19958,22 +24954,31 @@ var ts;
         }
         return path + "/index.d.ts";
     }
+    /* @internal */
     function directoryProbablyExists(directoryName, host) {
+        // if host does not support 'directoryExists' assume that directory will exist
         return !host.directoryExists || host.directoryExists(directoryName);
     }
     ts.directoryProbablyExists = directoryProbablyExists;
     function loadModuleFromFileNoPackageId(extensions, candidate, failedLookupLocations, onlyRecordFailures, state) {
         return noPackageId(loadModuleFromFile(extensions, candidate, failedLookupLocations, onlyRecordFailures, state));
     }
+    /**
+     * @param {boolean} onlyRecordFailures - if true then function won't try to actually load files but instead record all attempts as failures. This flag is necessary
+     * in cases when we know upfront that all load attempts will fail (because containing folder does not exists) however we still need to record all failed lookup locations.
+     */
     function loadModuleFromFile(extensions, candidate, failedLookupLocations, onlyRecordFailures, state) {
         if (extensions === Extensions.Json) {
-            var extensionLess = ts.tryRemoveExtension(candidate, ".json");
+            var extensionLess = ts.tryRemoveExtension(candidate, ".json" /* Json */);
             return extensionLess === undefined ? undefined : tryAddingExtensions(extensionLess, extensions, failedLookupLocations, onlyRecordFailures, state);
         }
+        // First, try adding an extension. An import of "foo" could be matched by a file "foo.ts", or "foo.js" by "foo.js.ts"
         var resolvedByAddingExtension = tryAddingExtensions(candidate, extensions, failedLookupLocations, onlyRecordFailures, state);
         if (resolvedByAddingExtension) {
             return resolvedByAddingExtension;
         }
+        // If that didn't work, try stripping a ".js" or ".jsx" extension and replacing it with a TypeScript one;
+        // e.g. "./foo.js" can be matched by "./foo.ts" or "./foo.d.ts"
         if (ts.hasJavaScriptFileExtension(candidate)) {
             var extensionless = ts.removeFileExtension(candidate);
             if (state.traceEnabled) {
@@ -19983,8 +24988,10 @@ var ts;
             return tryAddingExtensions(extensionless, extensions, failedLookupLocations, onlyRecordFailures, state);
         }
     }
+    /** Try to return an existing file that adds one of the `extensions` to `candidate`. */
     function tryAddingExtensions(candidate, extensions, failedLookupLocations, onlyRecordFailures, state) {
         if (!onlyRecordFailures) {
+            // check if containing folder exists - if it doesn't then just record failures for all supported extensions without disk probing
             var directory = ts.getDirectoryPath(candidate);
             if (directory) {
                 onlyRecordFailures = !directoryProbablyExists(directory, state.host);
@@ -19992,19 +24999,20 @@ var ts;
         }
         switch (extensions) {
             case Extensions.DtsOnly:
-                return tryExtension(".d.ts");
+                return tryExtension(".d.ts" /* Dts */);
             case Extensions.TypeScript:
-                return tryExtension(".ts") || tryExtension(".tsx") || tryExtension(".d.ts");
+                return tryExtension(".ts" /* Ts */) || tryExtension(".tsx" /* Tsx */) || tryExtension(".d.ts" /* Dts */);
             case Extensions.JavaScript:
-                return tryExtension(".js") || tryExtension(".jsx");
+                return tryExtension(".js" /* Js */) || tryExtension(".jsx" /* Jsx */);
             case Extensions.Json:
-                return tryExtension(".json");
+                return tryExtension(".json" /* Json */);
         }
         function tryExtension(ext) {
             var path = tryFile(candidate + ext, failedLookupLocations, onlyRecordFailures, state);
             return path === undefined ? undefined : { path: path, ext: ext };
         }
     }
+    /** Return the file if it exists. */
     function tryFile(fileName, failedLookupLocations, onlyRecordFailures, state) {
         if (!onlyRecordFailures) {
             if (state.host.fileExists(fileName)) {
@@ -20043,25 +25051,25 @@ var ts;
         var packageJsonPath = pathToPackageJson(nodeModuleDirectory);
         if (directoryExists && host.fileExists(packageJsonPath)) {
             var packageJsonContent = readJson(packageJsonPath, host);
-            if (subModuleName === "") {
-                var path = tryReadPackageJsonFields(true, packageJsonContent, nodeModuleDirectory, state);
+            if (subModuleName === "") { // looking up the root - need to handle types/typings/main redirects for subModuleName
+                var path = tryReadPackageJsonFields(/*readTypes*/ true, packageJsonContent, nodeModuleDirectory, state);
                 if (typeof path === "string") {
                     subModuleName = addExtensionAndIndex(path.substring(nodeModuleDirectory.length + 1));
                 }
                 else {
-                    var jsPath = tryReadPackageJsonFields(false, packageJsonContent, nodeModuleDirectory, state);
+                    var jsPath = tryReadPackageJsonFields(/*readTypes*/ false, packageJsonContent, nodeModuleDirectory, state);
                     if (typeof jsPath === "string" && jsPath.length > nodeModuleDirectory.length) {
                         var potentialSubModule_1 = jsPath.substring(nodeModuleDirectory.length + 1);
                         subModuleName = (ts.forEach(ts.supportedJavascriptExtensions, function (extension) {
                             return ts.tryRemoveExtension(potentialSubModule_1, extension);
-                        }) || potentialSubModule_1) + ".d.ts";
+                        }) || potentialSubModule_1) + ".d.ts" /* Dts */;
                     }
                     else {
                         subModuleName = "index.d.ts";
                     }
                 }
             }
-            if (!ts.endsWith(subModuleName, ".d.ts")) {
+            if (!ts.endsWith(subModuleName, ".d.ts" /* Dts */)) {
                 subModuleName = addExtensionAndIndex(subModuleName);
             }
             var packageId = typeof packageJsonContent.name === "string" && typeof packageJsonContent.version === "string"
@@ -20081,6 +25089,7 @@ var ts;
             if (directoryExists && traceEnabled) {
                 trace(host, ts.Diagnostics.File_0_does_not_exist, packageJsonPath);
             }
+            // record package json as one of failed lookup locations - in the future if this file will appear it will invalidate resolution results
             failedLookupLocations.push(packageJsonPath);
             return { found: false, packageJsonContent: undefined, packageId: undefined };
         }
@@ -20089,7 +25098,8 @@ var ts;
         var file = tryReadPackageJsonFields(extensions !== Extensions.JavaScript && extensions !== Extensions.Json, jsonContent, candidate, state);
         if (!file) {
             if (extensions === Extensions.TypeScript) {
-                file = tryReadPackageJsonFields(false, jsonContent, candidate, state);
+                // When resolving typescript modules, try resolving using main field as well
+                file = tryReadPackageJsonFields(/*readTypes*/ false, jsonContent, candidate, state);
                 if (!file) {
                     return undefined;
                 }
@@ -20109,27 +25119,32 @@ var ts;
                 trace(state.host, ts.Diagnostics.File_0_has_an_unsupported_extension_so_skipping_it, fromFile);
             }
         }
+        // Even if extensions is DtsOnly, we can still look up a .ts file as a result of package.json "types"
         var nextExtensions = extensions === Extensions.DtsOnly ? Extensions.TypeScript : extensions;
-        var result = nodeLoadModuleByRelativeName(nextExtensions, file, failedLookupLocations, onlyRecordFailures, state, false);
+        // Don't do package.json lookup recursively, because Node.js' package lookup doesn't.
+        var result = nodeLoadModuleByRelativeName(nextExtensions, file, failedLookupLocations, onlyRecordFailures, state, /*considerPackageJson*/ false);
         if (result) {
+            // It won't have a `packageId` set, because we disabled `considerPackageJson`.
             ts.Debug.assert(result.packageId === undefined);
             return { path: result.path, ext: result.extension };
         }
     }
+    /** Resolve from an arbitrarily specified file. Return `undefined` if it has an unsupported extension. */
     function resolvedIfExtensionMatches(extensions, path) {
         var ext = ts.tryGetExtensionFromPath(path);
         return ext !== undefined && extensionIsOk(extensions, ext) ? { path: path, ext: ext } : undefined;
     }
+    /** True if `extension` is one of the supported `extensions`. */
     function extensionIsOk(extensions, extension) {
         switch (extensions) {
             case Extensions.JavaScript:
-                return extension === ".js" || extension === ".jsx";
+                return extension === ".js" /* Js */ || extension === ".jsx" /* Jsx */;
             case Extensions.Json:
-                return extension === ".json";
+                return extension === ".json" /* Json */;
             case Extensions.TypeScript:
-                return extension === ".ts" || extension === ".tsx" || extension === ".d.ts";
+                return extension === ".ts" /* Ts */ || extension === ".tsx" /* Tsx */ || extension === ".d.ts" /* Dts */;
             case Extensions.DtsOnly:
-                return extension === ".d.ts";
+                return extension === ".d.ts" /* Dts */;
         }
     }
     function pathToPackageJson(directory) {
@@ -20137,16 +25152,18 @@ var ts;
     }
     function loadModuleFromNodeModulesFolder(extensions, moduleName, nodeModulesFolder, nodeModulesFolderExists, failedLookupLocations, state) {
         var candidate = ts.normalizePath(ts.combinePaths(nodeModulesFolder, moduleName));
+        // First look for a nested package.json, as in `node_modules/foo/bar/package.json`.
         var packageJsonContent;
         var packageId;
-        var packageInfo = getPackageJsonInfo(candidate, "", failedLookupLocations, !nodeModulesFolderExists, state);
+        var packageInfo = getPackageJsonInfo(candidate, "", failedLookupLocations, /*onlyRecordFailures*/ !nodeModulesFolderExists, state);
         if (packageInfo.found) {
             (packageJsonContent = packageInfo.packageJsonContent, packageId = packageInfo.packageId);
         }
         else {
             var _a = getPackageName(moduleName), packageName = _a.packageName, rest = _a.rest;
-            if (rest !== "") {
+            if (rest !== "") { // If "rest" is empty, we just did this search above.
                 var packageRootPath = ts.combinePaths(nodeModulesFolder, packageName);
+                // Don't use a "types" or "main" from here because we're not loading the root, but a subdirectory -- just here for the packageId.
                 packageId = getPackageJsonInfo(packageRootPath, rest, failedLookupLocations, !nodeModulesFolderExists, state).packageId;
             }
         }
@@ -20154,6 +25171,7 @@ var ts;
             loadNodeModuleFromDirectoryWorker(extensions, candidate, failedLookupLocations, !nodeModulesFolderExists, state, packageJsonContent);
         return withPackageId(packageId, pathAndExtension);
     }
+    /* @internal */
     function getPackageName(moduleName) {
         var idx = moduleName.indexOf(ts.directorySeparator);
         if (moduleName[0] === "@") {
@@ -20163,10 +25181,11 @@ var ts;
     }
     ts.getPackageName = getPackageName;
     function loadModuleFromNodeModules(extensions, moduleName, directory, failedLookupLocations, state, cache) {
-        return loadModuleFromNodeModulesWorker(extensions, moduleName, directory, failedLookupLocations, state, false, cache);
+        return loadModuleFromNodeModulesWorker(extensions, moduleName, directory, failedLookupLocations, state, /*typesOnly*/ false, cache);
     }
     function loadModuleFromNodeModulesAtTypes(moduleName, directory, failedLookupLocations, state) {
-        return loadModuleFromNodeModulesWorker(Extensions.DtsOnly, moduleName, directory, failedLookupLocations, state, true, undefined);
+        // Extensions parameter here doesn't actually matter, because typesOnly ensures we're just doing @types lookup, which is always DtsOnly.
+        return loadModuleFromNodeModulesWorker(Extensions.DtsOnly, moduleName, directory, failedLookupLocations, state, /*typesOnly*/ true, /*cache*/ undefined);
     }
     function loadModuleFromNodeModulesWorker(extensions, moduleName, directory, failedLookupLocations, state, typesOnly, cache) {
         var perModuleNameCache = cache && cache.getOrCreateCacheForModuleName(moduleName);
@@ -20180,6 +25199,7 @@ var ts;
             }
         });
     }
+    /** Load a module from a single node_modules directory, but not from any ancestors' node_modules directories. */
     function loadModuleFromNodeModulesOneLevel(extensions, moduleName, directory, failedLookupLocations, state, typesOnly) {
         if (typesOnly === void 0) { typesOnly = false; }
         var nodeModulesFolder = ts.combinePaths(directory, "node_modules");
@@ -20203,7 +25223,9 @@ var ts;
             return loadModuleFromNodeModulesFolder(Extensions.DtsOnly, mangleScopedPackage(moduleName, state), nodeModulesAtTypes_1, nodeModulesAtTypesExists, failedLookupLocations, state);
         }
     }
+    /** Double underscores are used in DefinitelyTyped to delimit scoped packages. */
     var mangledScopedPackageSeparator = "__";
+    /** For a scoped package, we must look in `@types/foo__bar` instead of `@types/@foo/bar`. */
     function mangleScopedPackage(packageName, state) {
         var mangled = getMangledNameForScopedPackage(packageName);
         if (state.traceEnabled && mangled !== packageName) {
@@ -20211,20 +25233,23 @@ var ts;
         }
         return mangled;
     }
+    /* @internal */
     function getTypesPackageName(packageName) {
         return "@types/" + getMangledNameForScopedPackage(packageName);
     }
     ts.getTypesPackageName = getTypesPackageName;
+    /* @internal */
     function getMangledNameForScopedPackage(packageName) {
         if (ts.startsWith(packageName, "@")) {
             var replaceSlash = packageName.replace(ts.directorySeparator, mangledScopedPackageSeparator);
             if (replaceSlash !== packageName) {
-                return replaceSlash.slice(1);
+                return replaceSlash.slice(1); // Take off the "@"
             }
         }
         return packageName;
     }
     ts.getMangledNameForScopedPackage = getMangledNameForScopedPackage;
+    /* @internal */
     function getPackageNameFromAtTypesDirectory(mangledName) {
         var withoutAtTypePrefix = ts.removePrefix(mangledName, "@types/");
         if (withoutAtTypePrefix !== mangledName) {
@@ -20233,6 +25258,7 @@ var ts;
         return mangledName;
     }
     ts.getPackageNameFromAtTypesDirectory = getPackageNameFromAtTypesDirectory;
+    /* @internal */
     function getUnmangledNameForScopedPackage(typesPackageName) {
         return ts.stringContains(typesPackageName, mangledScopedPackageSeparator) ?
             "@" + typesPackageName.replace(mangledScopedPackageSeparator, ts.directorySeparator) :
@@ -20255,7 +25281,8 @@ var ts;
         var failedLookupLocations = [];
         var containingDirectory = ts.getDirectoryPath(containingFile);
         var resolved = tryResolve(Extensions.TypeScript) || tryResolve(Extensions.JavaScript);
-        return createResolvedModuleWithFailedLookupLocations(resolved && resolved.value, undefined, false, failedLookupLocations);
+        // No originalPath because classic resolution doesn't resolve realPath
+        return createResolvedModuleWithFailedLookupLocations(resolved && resolved.value, /*originalPath*/ undefined, /*isExternalLibraryImport*/ false, failedLookupLocations);
         function tryResolve(extensions) {
             var resolvedUsingSettings = tryLoadModuleUsingOptionalResolutionSettings(extensions, moduleName, containingDirectory, loadModuleFromFileNoPackageId, failedLookupLocations, state);
             if (resolvedUsingSettings) {
@@ -20263,28 +25290,35 @@ var ts;
             }
             var perModuleNameCache = cache && cache.getOrCreateCacheForModuleName(moduleName);
             if (!ts.isExternalModuleNameRelative(moduleName)) {
+                // Climb up parent directories looking for a module.
                 var resolved_3 = ts.forEachAncestorDirectory(containingDirectory, function (directory) {
                     var resolutionFromCache = tryFindNonRelativeModuleNameInCache(perModuleNameCache, moduleName, directory, traceEnabled, host, failedLookupLocations);
                     if (resolutionFromCache) {
                         return resolutionFromCache;
                     }
                     var searchName = ts.normalizePath(ts.combinePaths(directory, moduleName));
-                    return toSearchResult(loadModuleFromFileNoPackageId(extensions, searchName, failedLookupLocations, false, state));
+                    return toSearchResult(loadModuleFromFileNoPackageId(extensions, searchName, failedLookupLocations, /*onlyRecordFailures*/ false, state));
                 });
                 if (resolved_3) {
                     return resolved_3;
                 }
                 if (extensions === Extensions.TypeScript) {
+                    // If we didn't find the file normally, look it up in @types.
                     return loadModuleFromNodeModulesAtTypes(moduleName, containingDirectory, failedLookupLocations, state);
                 }
             }
             else {
                 var candidate = ts.normalizePath(ts.combinePaths(containingDirectory, moduleName));
-                return toSearchResult(loadModuleFromFileNoPackageId(extensions, candidate, failedLookupLocations, false, state));
+                return toSearchResult(loadModuleFromFileNoPackageId(extensions, candidate, failedLookupLocations, /*onlyRecordFailures*/ false, state));
             }
         }
     }
     ts.classicNameResolver = classicNameResolver;
+    /**
+     * LSHost may load a module from a global cache of typings.
+     * This is the minumum code needed to expose that functionality; the rest is in LSHost.
+     */
+    /* @internal */
     function loadModuleFromGlobalCache(moduleName, projectName, compilerOptions, host, globalCache) {
         var traceEnabled = isTraceEnabled(compilerOptions, host);
         if (traceEnabled) {
@@ -20293,78 +25327,76 @@ var ts;
         var state = { compilerOptions: compilerOptions, host: host, traceEnabled: traceEnabled };
         var failedLookupLocations = [];
         var resolved = loadModuleFromNodeModulesOneLevel(Extensions.DtsOnly, moduleName, globalCache, failedLookupLocations, state);
-        return createResolvedModuleWithFailedLookupLocations(resolved, undefined, true, failedLookupLocations);
+        return createResolvedModuleWithFailedLookupLocations(resolved, /*originalPath*/ undefined, /*isExternalLibraryImport*/ true, failedLookupLocations);
     }
     ts.loadModuleFromGlobalCache = loadModuleFromGlobalCache;
+    /**
+     * Wraps value to SearchResult.
+     * @returns undefined if value is undefined or { value } otherwise
+     */
     function toSearchResult(value) {
         return value !== undefined ? { value: value } : undefined;
     }
 })(ts || (ts = {}));
+//# sourceMappingURL=parser.js.map
+"use strict";
 var ts;
 (function (ts) {
-    function stringToInt(str) {
-        var n = parseInt(str, 10);
-        if (isNaN(n)) {
-            throw new Error("Error in parseInt(" + JSON.stringify(str) + ")");
+    var server;
+    (function (server) {
+        // tslint:disable variable-name
+        server.ActionSet = "action::set";
+        server.ActionInvalidate = "action::invalidate";
+        server.ActionPackageInstalled = "action::packageInstalled";
+        server.EventTypesRegistry = "event::typesRegistry";
+        server.EventBeginInstallTypes = "event::beginInstallTypes";
+        server.EventEndInstallTypes = "event::endInstallTypes";
+        server.EventInitializationFailed = "event::initializationFailed";
+        var Arguments;
+        (function (Arguments) {
+            Arguments.GlobalCacheLocation = "--globalTypingsCacheLocation";
+            Arguments.LogFile = "--logFile";
+            Arguments.EnableTelemetry = "--enableTelemetry";
+            Arguments.TypingSafeListLocation = "--typingSafeListLocation";
+            Arguments.TypesMapLocation = "--typesMapLocation";
+            /**
+             * This argument specifies the location of the NPM executable.
+             * typingsInstaller will run the command with `${npmLocation} install ...`.
+             */
+            Arguments.NpmLocation = "--npmLocation";
+        })(Arguments = server.Arguments || (server.Arguments = {}));
+        function hasArgument(argumentName) {
+            return ts.sys.args.indexOf(argumentName) >= 0;
         }
-        return n;
-    }
-    var isPrereleaseRegex = /^(.*)-next.\d+/;
-    var prereleaseSemverRegex = /^(\d+)\.(\d+)\.0-next.(\d+)$/;
-    var semverRegex = /^(\d+)\.(\d+)\.(\d+)$/;
-    var Semver = (function () {
-        function Semver(major, minor, patch, isPrerelease) {
-            this.major = major;
-            this.minor = minor;
-            this.patch = patch;
-            this.isPrerelease = isPrerelease;
+        server.hasArgument = hasArgument;
+        function findArgument(argumentName) {
+            var index = ts.sys.args.indexOf(argumentName);
+            return index >= 0 && index < ts.sys.args.length - 1
+                ? ts.sys.args[index + 1]
+                : undefined;
         }
-        Semver.parse = function (semver) {
-            var isPrerelease = isPrereleaseRegex.test(semver);
-            var result = Semver.tryParse(semver, isPrerelease);
-            if (!result) {
-                throw new Error("Unexpected semver: " + semver + " (isPrerelease: " + isPrerelease + ")");
-            }
-            return result;
-        };
-        Semver.fromRaw = function (_a) {
-            var major = _a.major, minor = _a.minor, patch = _a.patch, isPrerelease = _a.isPrerelease;
-            return new Semver(major, minor, patch, isPrerelease);
-        };
-        Semver.tryParse = function (semver, isPrerelease) {
-            var rgx = isPrerelease ? prereleaseSemverRegex : semverRegex;
-            var match = rgx.exec(semver);
-            return match ? new Semver(stringToInt(match[1]), stringToInt(match[2]), stringToInt(match[3]), isPrerelease) : undefined;
-        };
-        Object.defineProperty(Semver.prototype, "versionString", {
-            get: function () {
-                return this.isPrerelease ? this.major + "." + this.minor + ".0-next." + this.patch : this.major + "." + this.minor + "." + this.patch;
-            },
-            enumerable: true,
-            configurable: true
-        });
-        Semver.prototype.equals = function (sem) {
-            return this.major === sem.major && this.minor === sem.minor && this.patch === sem.patch && this.isPrerelease === sem.isPrerelease;
-        };
-        Semver.prototype.greaterThan = function (sem) {
-            return this.major > sem.major || this.major === sem.major
-                && (this.minor > sem.minor || this.minor === sem.minor
-                    && (!this.isPrerelease && sem.isPrerelease || this.isPrerelease === sem.isPrerelease
-                        && this.patch > sem.patch));
-        };
-        return Semver;
-    }());
-    ts.Semver = Semver;
+        server.findArgument = findArgument;
+        /*@internal*/
+        function nowString() {
+            // E.g. "12:34:56.789"
+            var d = new Date();
+            return d.getHours() + ":" + d.getMinutes() + ":" + d.getSeconds() + "." + d.getMilliseconds();
+        }
+        server.nowString = nowString;
+    })(server = ts.server || (ts.server = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
     var JsTyping;
     (function (JsTyping) {
+        /* @internal */
         function isTypingUpToDate(cachedTyping, availableTypingVersions) {
             var availableVersion = ts.Semver.parse(ts.getProperty(availableTypingVersions, "ts" + ts.versionMajorMinor) || ts.getProperty(availableTypingVersions, "latest"));
             return !availableVersion.greaterThan(cachedTyping.version);
         }
         JsTyping.isTypingUpToDate = isTypingUpToDate;
+        /* @internal */
         JsTyping.nodeCoreModuleList = [
             "assert",
             "async_hooks",
@@ -20403,6 +25435,7 @@ var ts;
             "vm",
             "zlib"
         ];
+        /* @internal */
         JsTyping.nodeCoreModules = ts.arrayToSet(JsTyping.nodeCoreModuleList);
         function loadSafeList(host, safeListPath) {
             var result = ts.readConfigFile(safeListPath, function (path) { return host.readFile(path); });
@@ -20417,11 +25450,22 @@ var ts;
             return undefined;
         }
         JsTyping.loadTypesMap = loadTypesMap;
+        /**
+         * @param host is the object providing I/O related operations.
+         * @param fileNames are the file names that belong to the same project
+         * @param projectRootPath is the path to the project root directory
+         * @param safeListPath is the path used to retrieve the safe list
+         * @param packageNameToTypingLocation is the map of package names to their cached typing locations and installed versions
+         * @param typeAcquisition is used to customize the typing acquisition process
+         * @param compilerOptions are used as a source for typing inference
+         */
         function discoverTypings(host, log, fileNames, projectRootPath, safeList, packageNameToTypingLocation, typeAcquisition, unresolvedImports, typesRegistry) {
             if (!typeAcquisition || !typeAcquisition.enable) {
                 return { cachedTypingPaths: [], newTypingNames: [], filesToWatch: [] };
             }
+            // A typing name to typing file path mapping
             var inferredTypings = ts.createMap();
+            // Only infer typings for .js and .jsx files
             fileNames = ts.mapDefined(fileNames, function (fileName) {
                 var path = ts.normalizePath(fileName);
                 if (ts.hasJavaScriptFileExtension(path)) {
@@ -20432,6 +25476,7 @@ var ts;
             if (typeAcquisition.include)
                 addInferredTypings(typeAcquisition.include, "Explicitly included types");
             var exclude = typeAcquisition.exclude || [];
+            // Directories to search for package.json, bower.json and other typing information
             var possibleSearchDirs = ts.arrayToSet(fileNames, ts.getDirectoryPath);
             possibleSearchDirs.set(projectRootPath, true);
             possibleSearchDirs.forEach(function (_true, searchDir) {
@@ -20445,16 +25490,19 @@ var ts;
                 getTypingNamesFromPackagesFolder(nodeModulesPath, filesToWatch);
             });
             getTypingNamesFromSourceFileNames(fileNames);
+            // add typings for unresolved imports
             if (unresolvedImports) {
                 var module_1 = ts.deduplicate(unresolvedImports.map(function (moduleId) { return JsTyping.nodeCoreModules.has(moduleId) ? "node" : moduleId; }), ts.equateStringsCaseSensitive, ts.compareStringsCaseSensitive);
                 addInferredTypings(module_1, "Inferred typings from unresolved imports");
             }
+            // Add the cached typing locations for inferred typings that are already installed
             packageNameToTypingLocation.forEach(function (typing, name) {
                 var registryEntry = typesRegistry.get(name);
                 if (inferredTypings.has(name) && inferredTypings.get(name) === undefined && registryEntry !== undefined && isTypingUpToDate(typing, registryEntry)) {
                     inferredTypings.set(name, typing.typingLocation);
                 }
             });
+            // Remove typings that the user has added to the exclude list
             for (var _i = 0, exclude_1 = exclude; _i < exclude_1.length; _i++) {
                 var excludeTypingName = exclude_1[_i];
                 var didDelete = inferredTypings.delete(excludeTypingName);
@@ -20477,7 +25525,7 @@ var ts;
             return result;
             function addInferredTyping(typingName) {
                 if (!inferredTypings.has(typingName)) {
-                    inferredTypings.set(typingName, undefined);
+                    inferredTypings.set(typingName, undefined); // TODO: GH#18217
                 }
             }
             function addInferredTypings(typingNames, message) {
@@ -20485,6 +25533,9 @@ var ts;
                     log(message + ": " + JSON.stringify(typingNames));
                 ts.forEach(typingNames, addInferredTyping);
             }
+            /**
+             * Get the typing info from common package manager json files like package.json or bower.json
+             */
             function getTypingNamesFromJson(jsonPath, filesToWatch) {
                 if (!host.fileExists(jsonPath)) {
                     return;
@@ -20494,6 +25545,12 @@ var ts;
                 var jsonTypingNames = ts.flatMap([jsonConfig.dependencies, jsonConfig.devDependencies, jsonConfig.optionalDependencies, jsonConfig.peerDependencies], ts.getOwnKeys);
                 addInferredTypings(jsonTypingNames, "Typing names in '" + jsonPath + "' dependencies");
             }
+            /**
+             * Infer typing names from given file names. For example, the file name "jquery-min.2.3.4.js"
+             * should be inferred to the 'jquery' typing name; and "angular-route.1.2.3.js" should be inferred
+             * to the 'angular-route' typing name.
+             * @param fileNames are the names for source files in the project
+             */
             function getTypingNamesFromSourceFileNames(fileNames) {
                 var fromFileNames = ts.mapDefined(fileNames, function (j) {
                     if (!ts.hasJavaScriptFileExtension(j))
@@ -20505,19 +25562,25 @@ var ts;
                 if (fromFileNames.length) {
                     addInferredTypings(fromFileNames, "Inferred typings from file names");
                 }
-                var hasJsxFile = ts.some(fileNames, function (f) { return ts.fileExtensionIs(f, ".jsx"); });
+                var hasJsxFile = ts.some(fileNames, function (f) { return ts.fileExtensionIs(f, ".jsx" /* Jsx */); });
                 if (hasJsxFile) {
                     if (log)
                         log("Inferred 'react' typings due to presence of '.jsx' extension");
                     addInferredTyping("react");
                 }
             }
+            /**
+             * Infer typing names from packages folder (ex: node_module, bower_components)
+             * @param packagesFolderPath is the path to the packages folder
+             */
             function getTypingNamesFromPackagesFolder(packagesFolderPath, filesToWatch) {
                 filesToWatch.push(packagesFolderPath);
+                // Todo: add support for ModuleResolutionHost too
                 if (!host.directoryExists(packagesFolderPath)) {
                     return;
                 }
-                var fileNames = host.readDirectory(packagesFolderPath, [".json"], undefined, undefined, 2);
+                // depth of 2, so we access `node_modules/foo` but not `node_modules/foo/bar`
+                var fileNames = host.readDirectory(packagesFolderPath, [".json" /* Json */], /*excludes*/ undefined, /*includes*/ undefined, /*depth*/ 2);
                 if (log)
                     log("Searching for typing names in " + packagesFolderPath + "; all files: " + JSON.stringify(fileNames));
                 var packageNames = [];
@@ -20528,12 +25591,17 @@ var ts;
                     if (baseFileName !== "package.json" && baseFileName !== "bower.json") {
                         continue;
                     }
-                    var result_2 = ts.readConfigFile(normalizedFileName, function (path) { return host.readFile(path); });
-                    var packageJson = result_2.config;
+                    var result_1 = ts.readConfigFile(normalizedFileName, function (path) { return host.readFile(path); });
+                    var packageJson = result_1.config;
+                    // npm 3's package.json contains a "_requiredBy" field
+                    // we should include all the top level module names for npm 2, and only module names whose
+                    // "_requiredBy" field starts with "#" or equals "/" for npm 3.
                     if (baseFileName === "package.json" && packageJson._requiredBy &&
                         ts.filter(packageJson._requiredBy, function (r) { return r[0] === "#" || r === "/"; }).length === 0) {
                         continue;
                     }
+                    // If the package has its own d.ts typings, those will take precedence. Otherwise the package name will be used
+                    // to download d.ts files from DefinitelyTyped
                     if (!packageJson.name) {
                         continue;
                     }
@@ -20552,45 +25620,61 @@ var ts;
             }
         }
         JsTyping.discoverTypings = discoverTypings;
+        var PackageNameValidationResult;
+        (function (PackageNameValidationResult) {
+            PackageNameValidationResult[PackageNameValidationResult["Ok"] = 0] = "Ok";
+            PackageNameValidationResult[PackageNameValidationResult["ScopedPackagesNotSupported"] = 1] = "ScopedPackagesNotSupported";
+            PackageNameValidationResult[PackageNameValidationResult["EmptyName"] = 2] = "EmptyName";
+            PackageNameValidationResult[PackageNameValidationResult["NameTooLong"] = 3] = "NameTooLong";
+            PackageNameValidationResult[PackageNameValidationResult["NameStartsWithDot"] = 4] = "NameStartsWithDot";
+            PackageNameValidationResult[PackageNameValidationResult["NameStartsWithUnderscore"] = 5] = "NameStartsWithUnderscore";
+            PackageNameValidationResult[PackageNameValidationResult["NameContainsNonURISafeCharacters"] = 6] = "NameContainsNonURISafeCharacters";
+        })(PackageNameValidationResult = JsTyping.PackageNameValidationResult || (JsTyping.PackageNameValidationResult = {}));
         var maxPackageNameLength = 214;
+        /**
+         * Validates package name using rules defined at https://docs.npmjs.com/files/package.json
+         */
         function validatePackageName(packageName) {
             if (!packageName) {
-                return 2;
+                return 2 /* EmptyName */;
             }
             if (packageName.length > maxPackageNameLength) {
-                return 3;
+                return 3 /* NameTooLong */;
             }
-            if (packageName.charCodeAt(0) === 46) {
-                return 4;
+            if (packageName.charCodeAt(0) === 46 /* dot */) {
+                return 4 /* NameStartsWithDot */;
             }
-            if (packageName.charCodeAt(0) === 95) {
-                return 5;
+            if (packageName.charCodeAt(0) === 95 /* _ */) {
+                return 5 /* NameStartsWithUnderscore */;
             }
+            // check if name is scope package like: starts with @ and has one '/' in the middle
+            // scoped packages are not currently supported
+            // TODO: when support will be added we'll need to split and check both scope and package name
             if (/^@[^/]+\/[^/]+$/.test(packageName)) {
-                return 1;
+                return 1 /* ScopedPackagesNotSupported */;
             }
             if (encodeURIComponent(packageName) !== packageName) {
-                return 6;
+                return 6 /* NameContainsNonURISafeCharacters */;
             }
-            return 0;
+            return 0 /* Ok */;
         }
         JsTyping.validatePackageName = validatePackageName;
         function renderPackageNameValidationFailure(result, typing) {
             switch (result) {
-                case 2:
+                case 2 /* EmptyName */:
                     return "Package name '" + typing + "' cannot be empty";
-                case 3:
+                case 3 /* NameTooLong */:
                     return "Package name '" + typing + "' should be less than " + maxPackageNameLength + " characters";
-                case 4:
+                case 4 /* NameStartsWithDot */:
                     return "Package name '" + typing + "' cannot start with '.'";
-                case 5:
+                case 5 /* NameStartsWithUnderscore */:
                     return "Package name '" + typing + "' cannot start with '_'";
-                case 1:
+                case 1 /* ScopedPackagesNotSupported */:
                     return "Package '" + typing + "' is scoped and currently is not supported";
-                case 6:
+                case 6 /* NameContainsNonURISafeCharacters */:
                     return "Package name '" + typing + "' contains non URI safe characters";
-                case 0:
-                    return ts.Debug.fail();
+                case 0 /* Ok */:
+                    return ts.Debug.fail(); // Shouldn't have called this.
                 default:
                     throw ts.Debug.assertNever(result);
             }
@@ -20598,44 +25682,73 @@ var ts;
         JsTyping.renderPackageNameValidationFailure = renderPackageNameValidationFailure;
     })(JsTyping = ts.JsTyping || (ts.JsTyping = {}));
 })(ts || (ts = {}));
+/* @internal */
 var ts;
 (function (ts) {
-    var server;
-    (function (server) {
-        server.ActionSet = "action::set";
-        server.ActionInvalidate = "action::invalidate";
-        server.ActionPackageInstalled = "action::packageInstalled";
-        server.EventTypesRegistry = "event::typesRegistry";
-        server.EventBeginInstallTypes = "event::beginInstallTypes";
-        server.EventEndInstallTypes = "event::endInstallTypes";
-        server.EventInitializationFailed = "event::initializationFailed";
-        var Arguments;
-        (function (Arguments) {
-            Arguments.GlobalCacheLocation = "--globalTypingsCacheLocation";
-            Arguments.LogFile = "--logFile";
-            Arguments.EnableTelemetry = "--enableTelemetry";
-            Arguments.TypingSafeListLocation = "--typingSafeListLocation";
-            Arguments.TypesMapLocation = "--typesMapLocation";
-            Arguments.NpmLocation = "--npmLocation";
-        })(Arguments = server.Arguments || (server.Arguments = {}));
-        function hasArgument(argumentName) {
-            return ts.sys.args.indexOf(argumentName) >= 0;
+    function stringToInt(str) {
+        var n = parseInt(str, 10);
+        if (isNaN(n)) {
+            throw new Error("Error in parseInt(" + JSON.stringify(str) + ")");
         }
-        server.hasArgument = hasArgument;
-        function findArgument(argumentName) {
-            var index = ts.sys.args.indexOf(argumentName);
-            return index >= 0 && index < ts.sys.args.length - 1
-                ? ts.sys.args[index + 1]
-                : undefined;
+        return n;
+    }
+    var isPrereleaseRegex = /^(.*)-next.\d+/;
+    var prereleaseSemverRegex = /^(\d+)\.(\d+)\.0-next.(\d+)$/;
+    var semverRegex = /^(\d+)\.(\d+)\.(\d+)$/;
+    var Semver = /** @class */ (function () {
+        function Semver(major, minor, patch, 
+        /**
+         * If true, this is `major.minor.0-next.patch`.
+         * If false, this is `major.minor.patch`.
+         */
+        isPrerelease) {
+            this.major = major;
+            this.minor = minor;
+            this.patch = patch;
+            this.isPrerelease = isPrerelease;
         }
-        server.findArgument = findArgument;
-        function nowString() {
-            var d = new Date();
-            return d.getHours() + ":" + d.getMinutes() + ":" + d.getSeconds() + "." + d.getMilliseconds();
-        }
-        server.nowString = nowString;
-    })(server = ts.server || (ts.server = {}));
+        Semver.parse = function (semver) {
+            var isPrerelease = isPrereleaseRegex.test(semver);
+            var result = Semver.tryParse(semver, isPrerelease);
+            if (!result) {
+                throw new Error("Unexpected semver: " + semver + " (isPrerelease: " + isPrerelease + ")");
+            }
+            return result;
+        };
+        Semver.fromRaw = function (_a) {
+            var major = _a.major, minor = _a.minor, patch = _a.patch, isPrerelease = _a.isPrerelease;
+            return new Semver(major, minor, patch, isPrerelease);
+        };
+        // This must parse the output of `versionString`.
+        Semver.tryParse = function (semver, isPrerelease) {
+            // Per the semver spec <http://semver.org/#spec-item-2>:
+            // "A normal version number MUST take the form X.Y.Z where X, Y, and Z are non-negative integers, and MUST NOT contain leading zeroes."
+            var rgx = isPrerelease ? prereleaseSemverRegex : semverRegex;
+            var match = rgx.exec(semver);
+            return match ? new Semver(stringToInt(match[1]), stringToInt(match[2]), stringToInt(match[3]), isPrerelease) : undefined;
+        };
+        Object.defineProperty(Semver.prototype, "versionString", {
+            get: function () {
+                return this.isPrerelease ? this.major + "." + this.minor + ".0-next." + this.patch : this.major + "." + this.minor + "." + this.patch;
+            },
+            enumerable: true,
+            configurable: true
+        });
+        Semver.prototype.equals = function (sem) {
+            return this.major === sem.major && this.minor === sem.minor && this.patch === sem.patch && this.isPrerelease === sem.isPrerelease;
+        };
+        Semver.prototype.greaterThan = function (sem) {
+            return this.major > sem.major || this.major === sem.major
+                && (this.minor > sem.minor || this.minor === sem.minor
+                    && (!this.isPrerelease && sem.isPrerelease || this.isPrerelease === sem.isPrerelease
+                        && this.patch > sem.patch));
+        };
+        return Semver;
+    }());
+    ts.Semver = Semver;
 })(ts || (ts = {}));
+//# sourceMappingURL=jsTyping.js.map
+"use strict";
 var ts;
 (function (ts) {
     var server;
@@ -20658,6 +25771,7 @@ var ts;
                     return undefined;
                 }
             }
+            /*@internal*/
             function installNpmPackages(npmPath, tsVersion, packageNames, install) {
                 var hasError = false;
                 for (var remaining = packageNames.length; remaining > 0;) {
@@ -20668,6 +25782,7 @@ var ts;
                 return hasError;
             }
             typingsInstaller.installNpmPackages = installNpmPackages;
+            /*@internal*/
             function getNpmCommandForInstallation(npmPath, tsVersion, packageNames, remaining) {
                 var sliceStart = packageNames.length - remaining;
                 var command, toSlice = remaining;
@@ -20693,7 +25808,7 @@ var ts;
                     Math.min(indexOfNodeModules, indexOfBowerComponents);
                 return subStrLength === -1 ? f : f.substr(0, subStrLength);
             }
-            var TypingsInstaller = (function () {
+            var TypingsInstaller = /** @class */ (function () {
                 function TypingsInstaller(installTypingHost, globalCachePath, safeListPath, typesMapLocation, throttleLimit, log) {
                     if (log === void 0) { log = nullLog; }
                     this.installTypingHost = installTypingHost;
@@ -20742,6 +25857,7 @@ var ts;
                     if (this.log.isEnabled()) {
                         this.log.writeLine("Got install request " + JSON.stringify(req));
                     }
+                    // load existing typing information from the cache
                     if (req.cachePath) {
                         if (this.log.isEnabled()) {
                             this.log.writeLine("Request specifies cache path '" + req.cachePath + "', loading cached information...");
@@ -20755,7 +25871,9 @@ var ts;
                     if (this.log.isEnabled()) {
                         this.log.writeLine("Finished typings discovery: " + JSON.stringify(discoverTypingsResult));
                     }
+                    // start watching files
                     this.watchFiles(req.projectName, discoverTypingsResult.filesToWatch, req.projectRootPath);
+                    // install typings
                     if (discoverTypingsResult.newTypingNames.length) {
                         this.installTypings(req, req.cachePath || this.globalCachePath, discoverTypingsResult.cachedTypingPaths, discoverTypingsResult.newTypingNames);
                     }
@@ -20767,6 +25885,7 @@ var ts;
                     }
                 };
                 TypingsInstaller.prototype.initializeSafeList = function () {
+                    // Prefer the safe list from the types map if it exists
                     if (this.typesMapLocation) {
                         var safeListFromMap = ts.JsTyping.loadTypesMap(this.installTypingHost, this.typesMapLocation);
                         if (safeListFromMap) {
@@ -20794,8 +25913,8 @@ var ts;
                         this.log.writeLine("Trying to find '" + packageJson + "'...");
                     }
                     if (this.installTypingHost.fileExists(packageJson) && this.installTypingHost.fileExists(packageLockJson)) {
-                        var npmConfig = JSON.parse(this.installTypingHost.readFile(packageJson));
-                        var npmLock = JSON.parse(this.installTypingHost.readFile(packageLockJson));
+                        var npmConfig = JSON.parse(this.installTypingHost.readFile(packageJson)); // TODO: GH#18217
+                        var npmLock = JSON.parse(this.installTypingHost.readFile(packageLockJson)); // TODO: GH#18217
                         if (this.log.isEnabled()) {
                             this.log.writeLine("Loaded content of '" + packageJson + "': " + JSON.stringify(npmConfig));
                             this.log.writeLine("Loaded content of '" + packageLockJson + "'");
@@ -20803,8 +25922,10 @@ var ts;
                         if (npmConfig.devDependencies && npmLock.dependencies) {
                             for (var key in npmConfig.devDependencies) {
                                 if (!ts.hasProperty(npmLock.dependencies, key)) {
+                                    // if package in package.json but not package-lock.json, skip adding to cache so it is reinstalled on next use
                                     continue;
                                 }
+                                // key is @types/<package name>
                                 var packageName = ts.getBaseFileName(key);
                                 if (!packageName) {
                                     continue;
@@ -20828,7 +25949,7 @@ var ts;
                                 }
                                 var info = ts.getProperty(npmLock.dependencies, key);
                                 var version_1 = info && info.version;
-                                var semver = ts.Semver.parse(version_1);
+                                var semver = ts.Semver.parse(version_1); // TODO: GH#18217
                                 var newTyping = { typingLocation: typingFile, version: semver };
                                 this.packageNameToTypingLocation.set(packageName, newTyping);
                             }
@@ -20848,7 +25969,8 @@ var ts;
                             return false;
                         }
                         var validationResult = ts.JsTyping.validatePackageName(typing);
-                        if (validationResult !== 0) {
+                        if (validationResult !== 0 /* Ok */) {
+                            // add typing name to missing set so we won't process it again
                             _this.missingTypingsSet.set(typing, true);
                             if (_this.log.isEnabled())
                                 _this.log.writeLine(ts.JsTyping.renderPackageNameValidationFailure(validationResult, typing));
@@ -20896,6 +26018,7 @@ var ts;
                     this.ensurePackageDirectoryExists(cachePath);
                     var requestId = this.installRunCount;
                     this.installRunCount++;
+                    // send progress event
                     this.sendResponse({
                         kind: server.EventBeginInstallTypes,
                         eventId: requestId,
@@ -20915,6 +26038,7 @@ var ts;
                                 }
                                 return;
                             }
+                            // TODO: watch project directory
                             if (_this.log.isEnabled()) {
                                 _this.log.writeLine("Installed typings " + JSON.stringify(scopedTypings));
                             }
@@ -20926,6 +26050,7 @@ var ts;
                                     _this.missingTypingsSet.set(packageName, true);
                                     continue;
                                 }
+                                // packageName is guaranteed to exist in typesRegistry by filterTypings
                                 var distTags = _this.typesRegistry.get(packageName);
                                 var newVersion = ts.Semver.parse(distTags["ts" + ts.versionMajorMinor] || distTags[_this.latestDistTag]);
                                 var newTyping = { typingLocation: typingFile, version: newVersion };
@@ -20944,7 +26069,7 @@ var ts;
                                 projectName: req.projectName,
                                 packagesToInstall: scopedTypings,
                                 installSuccess: ok,
-                                typingsInstallerVersion: ts.version
+                                typingsInstallerVersion: ts.version // tslint:disable-line no-unnecessary-qualifier (qualified explicitly to prevent occasional shadowing)
                             };
                             _this.sendResponse(response);
                         }
@@ -20962,6 +26087,7 @@ var ts;
                 TypingsInstaller.prototype.watchFiles = function (projectName, files, projectRootPath) {
                     var _this = this;
                     if (!files.length) {
+                        // shut down existing watchers
                         this.closeWatchers(projectName);
                         return;
                     }
@@ -20974,6 +26100,7 @@ var ts;
                     else {
                         ts.copyEntries(watchers, toRemove);
                     }
+                    // handler should be invoked once for the entire set of files since it will trigger full rediscovery of typings
                     watchers.isInvoked = false;
                     var isLoggingEnabled = this.log.isEnabled();
                     var createProjectWatcher = function (path, createWatch) {
@@ -20995,7 +26122,7 @@ var ts;
                                 watchers.isInvoked = true;
                                 _this.sendResponse({ projectName: projectName, kind: server.ActionInvalidate });
                             }
-                        }, 2000);
+                        }, /*pollingInterval*/ 2000);
                         return isLoggingEnabled ? {
                             close: function () {
                                 _this.log.writeLine("FileWatcher:: Closed:: WatchInfo: " + file);
@@ -21019,7 +26146,7 @@ var ts;
                                 watchers.isInvoked = true;
                                 _this.sendResponse({ projectName: projectName, kind: server.ActionInvalidate });
                             }
-                        }, true);
+                        }, /*recursive*/ true);
                         return isLoggingEnabled ? {
                             close: function () {
                                 _this.log.writeLine("DirectoryWatcher:: Closed:: WatchInfo: " + dir + " recursive");
@@ -21027,23 +26154,29 @@ var ts;
                             }
                         } : watcher;
                     };
+                    // Create watches from list of files
                     for (var _i = 0, files_1 = files; _i < files_1.length; _i++) {
                         var file = files_1[_i];
                         var filePath = this.toCanonicalFileName(file);
                         if (isPackageOrBowerJson(filePath)) {
+                            // package.json or bower.json exists, watch the file to detect changes and update typings
                             createProjectWatcher(filePath, createProjectFileWatcher);
                             continue;
                         }
+                        // path in projectRoot, watch project root
                         if (ts.containsPath(projectRootPath, filePath, projectRootPath, !this.installTypingHost.useCaseSensitiveFileNames)) {
                             createProjectWatcher(projectRootPath, createProjectDirectoryWatcher);
                             continue;
                         }
+                        // path in global cache, watch global cache
                         if (ts.containsPath(this.globalCachePath, filePath, projectRootPath, !this.installTypingHost.useCaseSensitiveFileNames)) {
                             createProjectWatcher(this.globalCachePath, createProjectDirectoryWatcher);
                             continue;
                         }
+                        // Get path without node_modules and bower_components
                         createProjectWatcher(getDirectoryExcludingNodeModulesOrBowerComponents(ts.getDirectoryPath(filePath)), createProjectDirectoryWatcher);
                     }
+                    // Remove unused watches
                     toRemove.forEach(function (watch, path) {
                         watch.close();
                         watchers.delete(path);
@@ -21065,7 +26198,7 @@ var ts;
                 };
                 TypingsInstaller.prototype.executeWithThrottling = function () {
                     var _this = this;
-                    var _loop_4 = function () {
+                    var _loop_1 = function () {
                         this_1.inFlightRequestCount++;
                         var request = this_1.pendingRunRequests.pop();
                         this_1.installWorker(request.requestId, request.packageNames, request.cwd, function (ok) {
@@ -21076,12 +26209,13 @@ var ts;
                     };
                     var this_1 = this;
                     while (this.inFlightRequestCount < this.throttleLimit && this.pendingRunRequests.length) {
-                        _loop_4();
+                        _loop_1();
                     }
                 };
                 return TypingsInstaller;
             }());
             typingsInstaller.TypingsInstaller = TypingsInstaller;
+            /* @internal */
             function typingsName(packageName) {
                 return "@types/" + packageName + "@ts" + ts.versionMajorMinor;
             }
@@ -21089,6 +26223,7 @@ var ts;
         })(typingsInstaller = server.typingsInstaller || (server.typingsInstaller = {}));
     })(server = ts.server || (ts.server = {}));
 })(ts || (ts = {}));
+//# sourceMappingURL=typingsInstallerCore.js.map
 var ts;
 (function (ts) {
     var server;
@@ -21298,3 +26433,4 @@ var ts;
         })(typingsInstaller = server.typingsInstaller || (server.typingsInstaller = {}));
     })(server = ts.server || (ts.server = {}));
 })(ts || (ts = {}));
+//# sourceMappingURL=typingsInstaller.js.map
\ No newline at end of file
diff --git a/lib/watchGuard.js b/lib/watchGuard.js
index 4048f128878..10b0c1e11ba 100644
--- a/lib/watchGuard.js
+++ b/lib/watchGuard.js
@@ -1,18 +1,3 @@
-/*! *****************************************************************************
-Copyright (c) Microsoft Corporation. All rights reserved. 
-Licensed under the Apache License, Version 2.0 (the "License"); you may not use
-this file except in compliance with the License. You may obtain a copy of the
-License at http://www.apache.org/licenses/LICENSE-2.0  
- 
-THIS CODE IS PROVIDED ON AN *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
-KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
-WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE, 
-MERCHANTABLITY OR NON-INFRINGEMENT. 
- 
-See the Apache Version 2.0 License for specific language governing permissions
-and limitations under the License.
-***************************************************************************** */
-
 "use strict";
 if (process.argv.length < 3) {
     process.exit(1);
@@ -25,3 +10,4 @@ try {
 }
 catch (_a) { }
 process.exit(0);
+//# sourceMappingURL=watchGuard.js.map
\ No newline at end of file
diff --git a/lib/zh-cn/diagnosticMessages.generated.json b/lib/zh-cn/diagnosticMessages.generated.json
index 74e21e92be9..c8a242bd195 100644
--- a/lib/zh-cn/diagnosticMessages.generated.json
+++ b/lib/zh-cn/diagnosticMessages.generated.json
@@ -941,6 +941,7 @@
   "Unexpected_end_of_text_1126": "文本意外结束。",
   "Unexpected_token_1012": "意外的标记。",
   "Unexpected_token_A_constructor_method_accessor_or_property_was_expected_1068": "意外的标记。应为构造函数、方法、访问器或属性。",
+  "Unexpected_token_A_type_parameter_name_was_expected_without_curly_braces_1069": "意外的标记。类型参数名不应包含大括号。",
   "Unexpected_token_expected_1179": "意外标记。应为 \"{\"。",
   "Unknown_compiler_option_0_5023": "未知的编译器选项“{0}”。",
   "Unknown_option_excludes_Did_you_mean_exclude_6114": "未知的 \"excludes\" 选项。你的意思是 \"exclude\"?",
diff --git a/lib/zh-tw/diagnosticMessages.generated.json b/lib/zh-tw/diagnosticMessages.generated.json
index fe237b08b4d..272c0aee893 100644
--- a/lib/zh-tw/diagnosticMessages.generated.json
+++ b/lib/zh-tw/diagnosticMessages.generated.json
@@ -208,6 +208,8 @@
   "Cannot_find_a_tsconfig_json_file_at_the_specified_directory_Colon_0_5057": "在指定的目錄 '{0}' 中找不到 tsconfig.json 檔案。",
   "Cannot_find_global_type_0_2318": "找不到全域類型 '{0}'。",
   "Cannot_find_global_value_0_2468": "找不到全域值 '{0}'。",
+  "Cannot_find_lib_definition_for_0_2726": "Cannot find lib definition for '{0}'.",
+  "Cannot_find_lib_definition_for_0_Did_you_mean_1_2727": "Cannot find lib definition for '{0}'. Did you mean '{1}'?",
   "Cannot_find_module_0_2307": "找不到模組 '{0}'。",
   "Cannot_find_name_0_2304": "找不到名稱 '{0}'。",
   "Cannot_find_name_0_Did_you_mean_1_2552": "找不到名稱 '{0}'。您指的是 '{1}' 嗎?",
@@ -941,6 +943,7 @@
   "Unexpected_end_of_text_1126": "未預期的文字結尾。",
   "Unexpected_token_1012": "未預期的語彙基元。",
   "Unexpected_token_A_constructor_method_accessor_or_property_was_expected_1068": "未預期的語彙基元。必須是建構函式、方法、存取子或屬性。",
+  "Unexpected_token_A_type_parameter_name_was_expected_without_curly_braces_1069": "權杖錯誤。類型參數名稱不應有大括號。",
   "Unexpected_token_expected_1179": "未預期的語彙基元。必須是 '{'。",
   "Unknown_compiler_option_0_5023": "不明的編譯器選項 '{0}'。",
   "Unknown_option_excludes_Did_you_mean_exclude_6114": "選項 'excludes' 未知。您是指 'exclude' 嗎?",
diff --git a/package-lock.json b/package-lock.json
index d60ec3b7545..a7da24d7994 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
     "name": "typescript",
-    "version": "2.9.0",
+    "version": "3.0.0",
     "lockfileVersion": 1,
     "requires": true,
     "dependencies": {
@@ -36,9 +36,9 @@
             }
         },
         "@octokit/rest": {
-            "version": "15.4.0",
-            "resolved": "https://registry.npmjs.org/@octokit/rest/-/rest-15.4.0.tgz",
-            "integrity": "sha512-cmDdt71Kufz0AZt/EPlJbce9NDhoc9ggJm9P7h6Y+WOds19Q6vBJAPApKTIpN4VpnvwB1XHEOdmqP7gZdPCNKw==",
+            "version": "15.8.1",
+            "resolved": "https://registry.npmjs.org/@octokit/rest/-/rest-15.8.1.tgz",
+            "integrity": "sha512-IpC/ctwwauiiSrnNTHOG4CyAPz5YwEX8wSSGuTBb0M1mJcAYJCaYZr11dSZTB4K2p2XFY4AY5+SZcW5aub3hSQ==",
             "dev": true,
             "requires": {
                 "before-after-hook": "1.1.0",
@@ -174,6 +174,15 @@
                 "@types/node": "8.5.5"
             }
         },
+        "@types/jake": {
+            "version": "0.0.30",
+            "resolved": "https://registry.npmjs.org/@types/jake/-/jake-0.0.30.tgz",
+            "integrity": "sha512-F5txkK3aW+fAi4YExGq4Q0W+jJXIhjUvqwMNFPh8kmM+ZU90S/KdDcEV4H+Ug9fHFPAVHG+veaHE8ZHmJJxHCw==",
+            "dev": true,
+            "requires": {
+                "@types/node": "8.5.5"
+            }
+        },
         "@types/merge2": {
             "version": "1.1.4",
             "resolved": "https://registry.npmjs.org/@types/merge2/-/merge2-1.1.4.tgz",
@@ -205,9 +214,9 @@
             }
         },
         "@types/mocha": {
-            "version": "5.2.0",
-            "resolved": "https://registry.npmjs.org/@types/mocha/-/mocha-5.2.0.tgz",
-            "integrity": "sha512-YeDiSEzznwZwwp766SJ6QlrTyBYUGPSIwmREHVTmktUYiT/WADdWtpt9iH0KuUSf8lZLdI4lP0X6PBzPo5//JQ==",
+            "version": "5.2.1",
+            "resolved": "https://registry.npmjs.org/@types/mocha/-/mocha-5.2.1.tgz",
+            "integrity": "sha512-dOrgprHnkDaj1pmrwdcMAf0QRNQzqTB5rxJph+iIQshSmIvtgRqJ0nim8u1vvXU8iOXZrH96+M46JDFTPLingA==",
             "dev": true
         },
         "@types/node": {
@@ -242,6 +251,15 @@
                 "@types/node": "8.5.5"
             }
         },
+        "@types/source-map-support": {
+            "version": "0.4.1",
+            "resolved": "https://registry.npmjs.org/@types/source-map-support/-/source-map-support-0.4.1.tgz",
+            "integrity": "sha512-eoyZxYGwaeHq5zCVeoNgY1dQy6dVdm1b7K9k1FRnWkf997Tji3NLBoLAjK5WCobeh1Qs6Q5KUV1rZCmHvzaDBw==",
+            "dev": true,
+            "requires": {
+                "@types/node": "8.5.5"
+            }
+        },
         "@types/through2": {
             "version": "2.0.33",
             "resolved": "https://registry.npmjs.org/@types/through2/-/through2-2.0.33.tgz",
@@ -275,6 +293,16 @@
                 "@types/node": "8.5.5"
             }
         },
+        "JSONStream": {
+            "version": "1.3.3",
+            "resolved": "https://registry.npmjs.org/JSONStream/-/JSONStream-1.3.3.tgz",
+            "integrity": "sha512-3Sp6WZZ/lXl+nTDoGpGWHEpTnnC6X5fnkolYZR6nwIfzbxxvA8utPWe1gCt7i0m9uVGsSz2IS8K8mJ7HmlduMg==",
+            "dev": true,
+            "requires": {
+                "jsonparse": "1.3.1",
+                "through": "2.3.8"
+            }
+        },
         "abbrev": {
             "version": "1.0.9",
             "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.0.9.tgz",
@@ -293,14 +321,14 @@
             "integrity": "sha512-efP54n3d1aLfjL2UMdaXa6DsswwzJeI5rqhbFvXMrKiJ6eJFpf+7R0zN7t8IC+XKn2YOAFAv6xbBNgHUkoHWLw==",
             "dev": true,
             "requires": {
-                "acorn": "5.5.3",
+                "acorn": "5.6.2",
                 "xtend": "4.0.1"
             },
             "dependencies": {
                 "acorn": {
-                    "version": "5.5.3",
-                    "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.5.3.tgz",
-                    "integrity": "sha512-jd5MkIUlbbmb07nXH0DT3y7rDVtkzDi4XZOUVWAer8ajmF/DTSSbl5oNFyDOl/OXA33Bl79+ypHhl2pN20VeOQ==",
+                    "version": "5.6.2",
+                    "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.6.2.tgz",
+                    "integrity": "sha512-zUzo1E5dI2Ey8+82egfnttyMlMZ2y0D8xOCO3PNPPlYXpl8NZvF6Qk9L9BEtJs+43FqEmfBViDqc5d1ckRDguw==",
                     "dev": true
                 }
             }
@@ -516,6 +544,23 @@
             "dev": true,
             "requires": {
                 "util": "0.10.3"
+            },
+            "dependencies": {
+                "inherits": {
+                    "version": "2.0.1",
+                    "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.1.tgz",
+                    "integrity": "sha1-sX0I0ya0Qj5Wjv9xn5GwscvfafE=",
+                    "dev": true
+                },
+                "util": {
+                    "version": "0.10.3",
+                    "resolved": "https://registry.npmjs.org/util/-/util-0.10.3.tgz",
+                    "integrity": "sha1-evsa/lCAUkZInj23/g7TeTNqwPk=",
+                    "dev": true,
+                    "requires": {
+                        "inherits": "2.0.1"
+                    }
+                }
             }
         },
         "assertion-error": {
@@ -725,9 +770,9 @@
             "integrity": "sha512-erYug8XoqzU3IfcU8fUgyHqyOXqIE4tUTTQ+7mqUjQlvnXkOO6OlT9c/ZoJVHYoAaqGxr09CN53G7XIsO4KtWA==",
             "dev": true,
             "requires": {
+                "JSONStream": "1.3.3",
                 "combine-source-map": "0.8.0",
                 "defined": "1.0.0",
-                "JSONStream": "1.3.2",
                 "safe-buffer": "5.1.2",
                 "through2": "2.0.3",
                 "umd": "3.0.3"
@@ -749,11 +794,12 @@
             "dev": true
         },
         "browserify": {
-            "version": "16.2.0",
-            "resolved": "https://registry.npmjs.org/browserify/-/browserify-16.2.0.tgz",
-            "integrity": "sha512-yotdAkp/ZbgDesHQBYU37zjc29JDH4iXT8hjzM1fdUVWogjARX0S1cKeX24Ci6zZ+jG+ADmCTRt6xvtmJnI+BQ==",
+            "version": "16.2.2",
+            "resolved": "https://registry.npmjs.org/browserify/-/browserify-16.2.2.tgz",
+            "integrity": "sha512-fMES05wq1Oukts6ksGUU2TMVHHp06LyQt0SIwbXIHm7waSrQmNBZePsU0iM/4f94zbvb/wHma+D1YrdzWYnF/A==",
             "dev": true,
             "requires": {
+                "JSONStream": "1.3.3",
                 "assert": "1.4.1",
                 "browser-pack": "6.1.0",
                 "browser-resolve": "1.11.2",
@@ -768,17 +814,16 @@
                 "deps-sort": "2.0.0",
                 "domain-browser": "1.2.0",
                 "duplexer2": "0.1.4",
-                "events": "2.0.0",
+                "events": "2.1.0",
                 "glob": "7.1.2",
-                "has": "1.0.1",
+                "has": "1.0.3",
                 "htmlescape": "1.1.1",
                 "https-browserify": "1.0.0",
                 "inherits": "2.0.3",
-                "insert-module-globals": "7.0.6",
-                "JSONStream": "1.3.2",
+                "insert-module-globals": "7.1.0",
                 "labeled-stream-splicer": "2.0.1",
                 "mkdirp": "0.5.1",
-                "module-deps": "6.0.2",
+                "module-deps": "6.1.0",
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             "dev": true,
             "requires": {
-                "tslib": "1.9.0"
+                "tslib": "1.9.2"
             }
         },
         "tty-browserify": {
@@ -5303,9 +5644,9 @@
             "dev": true
         },
         "typescript": {
-            "version": "2.9.0-dev.20180430",
-            "resolved": "https://registry.npmjs.org/typescript/-/typescript-2.9.0-dev.20180430.tgz",
-            "integrity": "sha512-KaYA4BpYsxHrnsZFs2DS/fhUkv9dTw72WMZBnCT2VFzn8R036PWjK8StbMaNHh4na9DEViGEEFg5bYBF3wDiIA==",
+            "version": "3.0.0-dev.20180609",
+            "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.0.0-dev.20180609.tgz",
+            "integrity": "sha512-bqO5mSGbxZoiY/9Y1bnnU36dC5CfnrA9I9WKf3QB0qMuJakoofO2DNTDRwsypyhCThlNtF2Ls/OMj3Txglu4Xg==",
             "dev": true
         },
         "uglify-js": {
@@ -5466,20 +5807,12 @@
             "dev": true
         },
         "util": {
-            "version": "0.10.3",
-            "resolved": "https://registry.npmjs.org/util/-/util-0.10.3.tgz",
-            "integrity": "sha1-evsa/lCAUkZInj23/g7TeTNqwPk=",
+            "version": "0.10.4",
+            "resolved": "https://registry.npmjs.org/util/-/util-0.10.4.tgz",
+            "integrity": "sha512-0Pm9hTQ3se5ll1XihRic3FDIku70C+iHUdT/W926rSgHV5QgXsYbKZN8MSC3tJtSkhuROzvsQjAaFENRXr+19A==",
             "dev": true,
             "requires": {
-                "inherits": "2.0.1"
-            },
-            "dependencies": {
-                "inherits": {
-                    "version": "2.0.1",
-                    "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.1.tgz",
-                    "integrity": "sha1-sX0I0ya0Qj5Wjv9xn5GwscvfafE=",
-                    "dev": true
-                }
+                "inherits": "2.0.3"
             }
         },
         "util-deprecate": {
@@ -5649,6 +5982,12 @@
                 "isexe": "2.0.0"
             }
         },
+        "which-module": {
+            "version": "2.0.0",
+            "resolved": "https://registry.npmjs.org/which-module/-/which-module-2.0.0.tgz",
+            "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho=",
+            "dev": true
+        },
         "window-size": {
             "version": "0.1.0",
             "resolved": "https://registry.npmjs.org/window-size/-/window-size-0.1.0.tgz",
@@ -5662,6 +6001,38 @@
             "integrity": "sha1-J1hIEIkUVqQXHI0CJkQa3pDLyus=",
             "dev": true
         },
+        "wrap-ansi": {
+            "version": "2.1.0",
+            "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
+            "integrity": "sha1-2Pw9KE3QV5T+hJc8rs3Rz4JP3YU=",
+            "dev": true,
+            "requires": {
+                "string-width": "1.0.2",
+                "strip-ansi": "3.0.1"
+            },
+            "dependencies": {
+                "is-fullwidth-code-point": {
+                    "version": "1.0.0",
+                    "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-1.0.0.tgz",
+                    "integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
+                    "dev": true,
+                    "requires": {
+                        "number-is-nan": "1.0.1"
+                    }
+                },
+                "string-width": {
+                    "version": "1.0.2",
+                    "resolved": "https://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
+                    "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
+                    "dev": true,
+                    "requires": {
+                        "code-point-at": "1.1.0",
+                        "is-fullwidth-code-point": "1.0.0",
+                        "strip-ansi": "3.0.1"
+                    }
+                }
+            }
+        },
         "wrappy": {
             "version": "1.0.2",
             "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
@@ -5690,6 +6061,18 @@
             "integrity": "sha1-pcbVMr5lbiPbgg77lDofBJmNY68=",
             "dev": true
         },
+        "y18n": {
+            "version": "3.2.1",
+            "resolved": "https://registry.npmjs.org/y18n/-/y18n-3.2.1.tgz",
+            "integrity": "sha1-bRX7qITAhnnA136I53WegR4H+kE=",
+            "dev": true
+        },
+        "yallist": {
+            "version": "2.1.2",
+            "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz",
+            "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=",
+            "dev": true
+        },
         "yargs": {
             "version": "3.10.0",
             "resolved": "https://registry.npmjs.org/yargs/-/yargs-3.10.0.tgz",
@@ -5702,6 +6085,23 @@
                 "decamelize": "1.2.0",
                 "window-size": "0.1.0"
             }
+        },
+        "yargs-parser": {
+            "version": "9.0.2",
+            "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-9.0.2.tgz",
+            "integrity": "sha1-nM9qQ0YP5O1Aqbto9I1DuKaMwHc=",
+            "dev": true,
+            "requires": {
+                "camelcase": "4.1.0"
+            },
+            "dependencies": {
+                "camelcase": {
+                    "version": "4.1.0",
+                    "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-4.1.0.tgz",
+                    "integrity": "sha1-1UVjW+HjPFQmScaRc+Xeas+uNN0=",
+                    "dev": true
+                }
+            }
         }
     }
 }
diff --git a/src/cancellationToken/tsconfig.json b/src/cancellationToken/tsconfig.json
index 24482589572..98e8512e9ac 100644
--- a/src/cancellationToken/tsconfig.json
+++ b/src/cancellationToken/tsconfig.json
@@ -4,6 +4,7 @@
         "outDir": "../../built/local/",
         "composite": false,
         "declaration": false,
+        "declarationMap": false,
         "removeComments": true,
         "module": "commonjs",
         "types": [
diff --git a/tests/baselines/reference/APISample_Watch.errors.txt b/tests/baselines/reference/APISample_Watch.errors.txt
new file mode 100644
index 00000000000..3c67e72a48d
--- /dev/null
+++ b/tests/baselines/reference/APISample_Watch.errors.txt
@@ -0,0 +1,206 @@
+typescript_standalone.d.ts(21,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(21,41): error TS1005: ';' expected.
+typescript_standalone.d.ts(8907,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(8907,42): error TS1005: ';' expected.
+typescript_standalone.d.ts(9167,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9167,46): error TS1005: ';' expected.
+typescript_standalone.d.ts(9517,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9517,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(9541,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9541,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(9628,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9628,38): error TS1005: ';' expected.
+typescript_standalone.d.ts(10792,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10792,57): error TS1005: ';' expected.
+typescript_standalone.d.ts(10803,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10803,41): error TS1005: ';' expected.
+typescript_standalone.d.ts(10813,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10813,48): error TS1005: ';' expected.
+typescript_standalone.d.ts(10888,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10888,47): error TS1005: ';' expected.
+typescript_standalone.d.ts(10945,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10945,47): error TS1005: ';' expected.
+typescript_standalone.d.ts(10999,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10999,52): error TS1005: ';' expected.
+typescript_standalone.d.ts(11019,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11019,44): error TS1005: ';' expected.
+typescript_standalone.d.ts(11029,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11029,35): error TS1005: ';' expected.
+typescript_standalone.d.ts(11063,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11063,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11066,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11066,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11070,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11070,45): error TS1005: ';' expected.
+typescript_standalone.d.ts(11088,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11088,56): error TS1005: ';' expected.
+typescript_standalone.d.ts(11114,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11114,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(11117,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11117,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11129,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11129,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11159,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11159,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11193,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11193,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11204,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11204,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11228,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11228,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11236,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11236,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11240,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11240,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11270,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11270,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11313,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11313,41): error TS1005: ';' expected.
+typescript_standalone.d.ts(11500,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11500,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11502,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11502,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11506,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11506,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11508,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11508,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11510,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11510,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11512,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11512,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11514,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11514,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11523,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11523,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11525,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11525,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11527,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11527,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11529,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11529,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11531,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11531,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11533,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11533,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11535,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11535,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11537,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11537,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11539,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11539,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11541,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11541,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11543,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11543,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11545,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11545,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11547,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11547,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11549,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11549,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11551,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11551,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11561,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11561,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11563,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11563,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11565,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11565,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11567,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11567,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11569,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11569,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11571,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11571,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11573,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11573,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11575,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11575,72): error TS1005: ';' expected.
+typescript_standalone.d.ts(11577,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11577,52): error TS1005: ';' expected.
+typescript_standalone.d.ts(11649,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11649,72): error TS1005: ';' expected.
+typescript_standalone.d.ts(11651,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11651,38): error TS1005: ';' expected.
+typescript_standalone.d.ts(11653,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11653,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11729,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11729,48): error TS1005: ';' expected.
+
+
+==== tests/cases/compiler/APISample_Watch.ts (0 errors) ====
+    /*
+     * Note: This test is a public API sample. The sample sources can be found
+             at: https://github.com/Microsoft/TypeScript-wiki/blob/master/Using-the-Compiler-API.md#writing-an-incremental-program-watcher
+     *       Please log a "breaking change" issue for any API breaking change affecting this issue
+     */
+    
+    declare var process: any;
+    declare var console: any;
+    declare var os: any;
+    
+    import ts = require("typescript");
+    
+    const formatHost: ts.FormatDiagnosticsHost = {
+        getCanonicalFileName: path => path,
+        getCurrentDirectory: ts.sys.getCurrentDirectory,
+        getNewLine: () => ts.sys.newLine,
+    }
+    
+    function watchMain() {
+        const configPath = ts.findConfigFile(/*searchPath*/ "./", ts.sys.fileExists, "tsconfig.json");
+        if (!configPath) {
+            throw new Error("Could not find a valid 'tsconfig.json'.");
+        }
+    
+        // TypeScript can use several different program creation "strategies":
+        //  * ts.createEmitAndSemanticDiagnosticsBuilderProgram,
+        //  * ts.createSemanticDiagnosticsBuilderProgram
+        //  * ts.createAbstractBuilder
+        // The first two produce "builder programs". These use an incremental strategy to only re-check and emit files whose
+        // contents may have changed, or whose dependencies may have changes which may impact change the result of prior type-check and emit.
+        // The last uses an ordinary program which does a full type check after every change.
+        // Between `createEmitAndSemanticDiagnosticsBuilderProgram` and `createSemanticDiagnosticsBuilderProgram`, the only difference is emit.
+        // For pure type-checking scenarios, or when another tool/process handles emit, using `createSemanticDiagnosticsBuilderProgram` may be more desirable.
+    
+        // Note that there is another overload for `createWatchCompilerHost` that takes a set of root files.
+        const host = ts.createWatchCompilerHost(configPath, {}, ts.sys,
+            ts.createSemanticDiagnosticsBuilderProgram,
+            reportDiagnostic,
+            reportWatchStatusChanged,
+        );
+    
+        // You can technically override any given hook on the host, though you probably don't need to.
+        // Note that we're assuming `origCreateProgram` and `origPostProgramCreate` doesn't use `this` at all.
+        const origCreateProgram = host.createProgram;
+        host.createProgram = (rootNames: ReadonlyArray<string>, options, host, oldProgram) => {
+            console.log("** We're about to create the program! **");
+            return origCreateProgram(rootNames, options, host, oldProgram);
+        }
+        const origPostProgramCreate = host.afterProgramCreate;
+    
+        host.afterProgramCreate = program => {
+            console.log("** We finished making the program! **");
+            origPostProgramCreate!(program);
+        };
+    
+        // `createWatchProgram` creates an initial program, watches files, and updates the program over time.
+        ts.createWatchProgram(host);
+    }
+    
+    function reportDiagnostic(diagnostic: ts.Diagnostic) {
+        console.error("Error", diagnostic.code, ":",
+            ts.flattenDiagnosticMessageText(diagnostic.messageText, formatHost.getNewLine())
+        );
+    }
+    
+    /**
+     * Prints a diagnostic every time the watch status changes.
+     * This is mainly for messages like "Starting compilation" or "Compilation completed".
+     */
+    function reportWatchStatusChanged(diagnostic: ts.Diagnostic) {
+        console.info(ts.formatDiagnostic(diagnostic, formatHost));
+    }
+    
+    watchMain();
+    
\ No newline at end of file
diff --git a/tests/baselines/reference/APISample_WatchWithDefaults.errors.txt b/tests/baselines/reference/APISample_WatchWithDefaults.errors.txt
new file mode 100644
index 00000000000..71644875d09
--- /dev/null
+++ b/tests/baselines/reference/APISample_WatchWithDefaults.errors.txt
@@ -0,0 +1,179 @@
+typescript_standalone.d.ts(21,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(21,41): error TS1005: ';' expected.
+typescript_standalone.d.ts(8907,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(8907,42): error TS1005: ';' expected.
+typescript_standalone.d.ts(9167,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9167,46): error TS1005: ';' expected.
+typescript_standalone.d.ts(9517,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9517,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(9541,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9541,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(9628,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9628,38): error TS1005: ';' expected.
+typescript_standalone.d.ts(10792,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10792,57): error TS1005: ';' expected.
+typescript_standalone.d.ts(10803,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10803,41): error TS1005: ';' expected.
+typescript_standalone.d.ts(10813,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10813,48): error TS1005: ';' expected.
+typescript_standalone.d.ts(10888,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10888,47): error TS1005: ';' expected.
+typescript_standalone.d.ts(10945,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10945,47): error TS1005: ';' expected.
+typescript_standalone.d.ts(10999,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10999,52): error TS1005: ';' expected.
+typescript_standalone.d.ts(11019,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11019,44): error TS1005: ';' expected.
+typescript_standalone.d.ts(11029,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11029,35): error TS1005: ';' expected.
+typescript_standalone.d.ts(11063,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11063,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11066,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11066,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11070,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11070,45): error TS1005: ';' expected.
+typescript_standalone.d.ts(11088,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11088,56): error TS1005: ';' expected.
+typescript_standalone.d.ts(11114,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11114,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(11117,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11117,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11129,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11129,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11159,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11159,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11193,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11193,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11204,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11204,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11228,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11228,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11236,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11236,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11240,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11240,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11270,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11270,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11313,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11313,41): error TS1005: ';' expected.
+typescript_standalone.d.ts(11500,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11500,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11502,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11502,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11506,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11506,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11508,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11508,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11510,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11510,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11512,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11512,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11514,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11514,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11523,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11523,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11525,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11525,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11527,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11527,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11529,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11529,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11531,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11531,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11533,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11533,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11535,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11535,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11537,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11537,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11539,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11539,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11541,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11541,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11543,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11543,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11545,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11545,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11547,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11547,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11549,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11549,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11551,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11551,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11561,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11561,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11563,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11563,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11565,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11565,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11567,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11567,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11569,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11569,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11571,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11571,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11573,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11573,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11575,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11575,72): error TS1005: ';' expected.
+typescript_standalone.d.ts(11577,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11577,52): error TS1005: ';' expected.
+typescript_standalone.d.ts(11649,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11649,72): error TS1005: ';' expected.
+typescript_standalone.d.ts(11651,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11651,38): error TS1005: ';' expected.
+typescript_standalone.d.ts(11653,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11653,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11729,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11729,48): error TS1005: ';' expected.
+
+
+==== tests/cases/compiler/APISample_WatchWithDefaults.ts (0 errors) ====
+    /*
+     * Note: This test is a public API sample. This uses default sys interface without having to pass anything
+     *       Please log a "breaking change" issue for any API breaking change affecting this issue
+     */
+    
+    declare var console: any;
+    
+    import ts = require("typescript");
+    
+    function watchMain() {
+        const configPath = ts.findConfigFile(/*searchPath*/ "./", ts.sys.fileExists, "tsconfig.json");
+        if (!configPath) {
+            throw new Error("Could not find a valid 'tsconfig.json'.");
+        }
+    
+        // TypeScript can use several different program creation "strategies":
+        //  * ts.createEmitAndSemanticDiagnosticsBuilderProgram,
+        //  * ts.createSemanticDiagnosticsBuilderProgram
+        //  * ts.createAbstractBuilder
+        // The first two produce "builder programs". These use an incremental strategy to only re-check and emit files whose
+        // contents may have changed, or whose dependencies may have changes which may impact change the result of prior type-check and emit.
+        // The last uses an ordinary program which does a full type check after every change.
+        // Between `createEmitAndSemanticDiagnosticsBuilderProgram` and `createSemanticDiagnosticsBuilderProgram`, the only difference is emit.
+        // For pure type-checking scenarios, or when another tool/process handles emit, using `createSemanticDiagnosticsBuilderProgram` may be more desirable.
+    
+        // Note that there is another overload for `createWatchCompilerHost` that takes a set of root files.
+        const host = ts.createWatchCompilerHost(configPath, {}, ts.sys);
+    
+        // You can technically override any given hook on the host, though you probably don't need to.
+        // Note that we're assuming `origCreateProgram` and `origPostProgramCreate` doesn't use `this` at all.
+        const origCreateProgram = host.createProgram;
+        host.createProgram = (rootNames, options, host, oldProgram) => {
+            console.log("** We're about to create the program! **");
+            return origCreateProgram(rootNames, options, host, oldProgram);
+        }
+        const origPostProgramCreate = host.afterProgramCreate;
+    
+        host.afterProgramCreate = program => {
+            console.log("** We finished making the program! **");
+            origPostProgramCreate!(program);
+        };
+    
+        // `createWatchProgram` creates an initial program, watches files, and updates the program over time.
+        ts.createWatchProgram(host);
+    }
+    
+    watchMain();
+    
\ No newline at end of file
diff --git a/tests/baselines/reference/APISample_WatchWithOwnWatchHost.errors.txt b/tests/baselines/reference/APISample_WatchWithOwnWatchHost.errors.txt
new file mode 100644
index 00000000000..e6e6e3b83da
--- /dev/null
+++ b/tests/baselines/reference/APISample_WatchWithOwnWatchHost.errors.txt
@@ -0,0 +1,186 @@
+typescript_standalone.d.ts(21,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(21,41): error TS1005: ';' expected.
+typescript_standalone.d.ts(8907,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(8907,42): error TS1005: ';' expected.
+typescript_standalone.d.ts(9167,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9167,46): error TS1005: ';' expected.
+typescript_standalone.d.ts(9517,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9517,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(9541,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9541,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(9628,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9628,38): error TS1005: ';' expected.
+typescript_standalone.d.ts(10792,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10792,57): error TS1005: ';' expected.
+typescript_standalone.d.ts(10803,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10803,41): error TS1005: ';' expected.
+typescript_standalone.d.ts(10813,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10813,48): error TS1005: ';' expected.
+typescript_standalone.d.ts(10888,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10888,47): error TS1005: ';' expected.
+typescript_standalone.d.ts(10945,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10945,47): error TS1005: ';' expected.
+typescript_standalone.d.ts(10999,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10999,52): error TS1005: ';' expected.
+typescript_standalone.d.ts(11019,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11019,44): error TS1005: ';' expected.
+typescript_standalone.d.ts(11029,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11029,35): error TS1005: ';' expected.
+typescript_standalone.d.ts(11063,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11063,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11066,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11066,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11070,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11070,45): error TS1005: ';' expected.
+typescript_standalone.d.ts(11088,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11088,56): error TS1005: ';' expected.
+typescript_standalone.d.ts(11114,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11114,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(11117,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11117,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11129,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11129,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11159,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11159,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11193,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11193,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11204,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11204,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11228,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11228,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11236,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11236,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11240,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11240,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11270,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11270,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11313,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11313,41): error TS1005: ';' expected.
+typescript_standalone.d.ts(11500,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11500,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11502,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11502,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11506,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11506,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11508,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11508,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11510,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11510,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11512,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11512,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11514,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11514,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11523,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11523,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11525,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11525,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11527,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11527,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11529,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11529,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11531,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11531,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11533,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11533,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11535,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11535,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11537,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11537,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11539,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11539,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11541,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11541,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11543,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11543,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11545,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11545,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11547,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11547,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11549,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11549,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11551,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11551,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11561,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11561,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11563,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11563,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11565,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11565,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11567,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11567,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11569,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11569,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11571,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11571,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11573,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11573,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11575,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11575,72): error TS1005: ';' expected.
+typescript_standalone.d.ts(11577,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11577,52): error TS1005: ';' expected.
+typescript_standalone.d.ts(11649,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11649,72): error TS1005: ';' expected.
+typescript_standalone.d.ts(11651,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11651,38): error TS1005: ';' expected.
+typescript_standalone.d.ts(11653,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11653,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11729,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11729,48): error TS1005: ';' expected.
+
+
+==== tests/cases/compiler/APISample_WatchWithOwnWatchHost.ts (0 errors) ====
+    /*
+     * Note: This test is a public API sample. This sample verifies creating abstract builder to watch list of root files 
+     *       Please log a "breaking change" issue for any API breaking change affecting this issue
+     */
+    
+    declare var console: any;
+    
+    import ts = require("typescript");
+    
+    function watchMain() {
+        // get list of files and compiler options somehow
+        const files: string[] = [];
+        const options: ts.CompilerOptions = {};
+    
+        const host: ts.WatchCompilerHostOfFilesAndCompilerOptions<ts.BuilderProgram> = {
+            rootFiles: files,
+            options,
+    
+            useCaseSensitiveFileNames: () => ts.sys.useCaseSensitiveFileNames,
+            getNewLine: () => ts.sys.newLine,
+            getCurrentDirectory: ts.sys.getCurrentDirectory,
+            getDefaultLibFileName: options => ts.getDefaultLibFilePath(options),
+    
+            fileExists: ts.sys.fileExists,
+            readFile: ts.sys.readFile,
+            directoryExists: ts.sys.directoryExists,
+            getDirectories: ts.sys.getDirectories,
+            readDirectory: ts.sys.readDirectory,
+            realpath: ts.sys.realpath,
+    
+            watchFile: ts.sys.watchFile!,
+            watchDirectory: ts.sys.watchDirectory!,
+            createProgram: ts.createAbstractBuilder
+        };
+    
+        // You can technically override any given hook on the host, though you probably don't need to.
+        // Note that we're assuming `origCreateProgram` and `origPostProgramCreate` doesn't use `this` at all.
+        const origCreateProgram = host.createProgram;
+        host.createProgram = (rootNames, options, host, oldProgram) => {
+            console.log("** We're about to create the program! **");
+            return origCreateProgram(rootNames, options, host, oldProgram);
+        }
+        const origPostProgramCreate = host.afterProgramCreate;
+    
+        host.afterProgramCreate = program => {
+            console.log("** We finished making the program! **");
+            origPostProgramCreate!(program);
+        };
+    
+        // `createWatchProgram` creates an initial program, watches files, and updates the program over time.
+        ts.createWatchProgram(host);
+    }
+    
+    watchMain();
+    
\ No newline at end of file
diff --git a/tests/baselines/reference/APISample_compile.errors.txt b/tests/baselines/reference/APISample_compile.errors.txt
new file mode 100644
index 00000000000..14e43e3dbac
--- /dev/null
+++ b/tests/baselines/reference/APISample_compile.errors.txt
@@ -0,0 +1,169 @@
+typescript_standalone.d.ts(21,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(21,41): error TS1005: ';' expected.
+typescript_standalone.d.ts(8907,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(8907,42): error TS1005: ';' expected.
+typescript_standalone.d.ts(9167,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9167,46): error TS1005: ';' expected.
+typescript_standalone.d.ts(9517,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9517,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(9541,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9541,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(9628,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9628,38): error TS1005: ';' expected.
+typescript_standalone.d.ts(10792,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10792,57): error TS1005: ';' expected.
+typescript_standalone.d.ts(10803,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10803,41): error TS1005: ';' expected.
+typescript_standalone.d.ts(10813,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10813,48): error TS1005: ';' expected.
+typescript_standalone.d.ts(10888,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10888,47): error TS1005: ';' expected.
+typescript_standalone.d.ts(10945,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10945,47): error TS1005: ';' expected.
+typescript_standalone.d.ts(10999,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10999,52): error TS1005: ';' expected.
+typescript_standalone.d.ts(11019,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11019,44): error TS1005: ';' expected.
+typescript_standalone.d.ts(11029,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11029,35): error TS1005: ';' expected.
+typescript_standalone.d.ts(11063,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11063,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11066,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11066,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11070,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11070,45): error TS1005: ';' expected.
+typescript_standalone.d.ts(11088,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11088,56): error TS1005: ';' expected.
+typescript_standalone.d.ts(11114,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11114,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(11117,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11117,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11129,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11129,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11159,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11159,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11193,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11193,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11204,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11204,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11228,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11228,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11236,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11236,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11240,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11240,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11270,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11270,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11313,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11313,41): error TS1005: ';' expected.
+typescript_standalone.d.ts(11500,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11500,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11502,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11502,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11506,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11506,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11508,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11508,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11510,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11510,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11512,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11512,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11514,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11514,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11523,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11523,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11525,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11525,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11527,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11527,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11529,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11529,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11531,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11531,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11533,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11533,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11535,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11535,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11537,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11537,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11539,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11539,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11541,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11541,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11543,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11543,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11545,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11545,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11547,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11547,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11549,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11549,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11551,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11551,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11561,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11561,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11563,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11563,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11565,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11565,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11567,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11567,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11569,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11569,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11571,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11571,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11573,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11573,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11575,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11575,72): error TS1005: ';' expected.
+typescript_standalone.d.ts(11577,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11577,52): error TS1005: ';' expected.
+typescript_standalone.d.ts(11649,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11649,72): error TS1005: ';' expected.
+typescript_standalone.d.ts(11651,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11651,38): error TS1005: ';' expected.
+typescript_standalone.d.ts(11653,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11653,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11729,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11729,48): error TS1005: ';' expected.
+
+
+==== tests/cases/compiler/APISample_compile.ts (0 errors) ====
+    /*
+     * Note: This test is a public API sample. The sample sources can be found
+             at: https://github.com/Microsoft/TypeScript/wiki/Using-the-Compiler-API#a-minimal-compiler
+     *       Please log a "breaking change" issue for any API breaking change affecting this issue
+     */
+    
+    declare var process: any;
+    declare var console: any;
+    declare var os: any;
+    
+    import ts = require("typescript");
+    
+    export function compile(fileNames: string[], options: ts.CompilerOptions): void {
+        var program = ts.createProgram(fileNames, options);
+        var emitResult = program.emit();
+    
+        var allDiagnostics = ts.getPreEmitDiagnostics(program);
+    
+        allDiagnostics.forEach(diagnostic => {
+            var message = ts.flattenDiagnosticMessageText(diagnostic.messageText, '\n');
+            if (!diagnostic.file) {
+                console.log(message);
+                return;
+            }
+            var { line, character } = diagnostic.file.getLineAndCharacterOfPosition(diagnostic.start!);
+            console.log(`${diagnostic.file.fileName} (${line + 1},${character + 1}): ${message}`);
+        });
+    
+        var exitCode = emitResult.emitSkipped ? 1 : 0;
+        console.log(`Process exiting with code '${exitCode}'.`);
+        process.exit(exitCode);
+    }
+    
+    compile(process.argv.slice(2), {
+        noEmitOnError: true, noImplicitAny: true,
+        target: ts.ScriptTarget.ES5, module: ts.ModuleKind.CommonJS
+    });
+    
\ No newline at end of file
diff --git a/tests/baselines/reference/APISample_jsdoc.errors.txt b/tests/baselines/reference/APISample_jsdoc.errors.txt
new file mode 100644
index 00000000000..790b59f2d54
--- /dev/null
+++ b/tests/baselines/reference/APISample_jsdoc.errors.txt
@@ -0,0 +1,244 @@
+typescript_standalone.d.ts(21,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(21,41): error TS1005: ';' expected.
+typescript_standalone.d.ts(8907,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(8907,42): error TS1005: ';' expected.
+typescript_standalone.d.ts(9167,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9167,46): error TS1005: ';' expected.
+typescript_standalone.d.ts(9517,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9517,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(9541,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9541,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(9628,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9628,38): error TS1005: ';' expected.
+typescript_standalone.d.ts(10792,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10792,57): error TS1005: ';' expected.
+typescript_standalone.d.ts(10803,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10803,41): error TS1005: ';' expected.
+typescript_standalone.d.ts(10813,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10813,48): error TS1005: ';' expected.
+typescript_standalone.d.ts(10888,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10888,47): error TS1005: ';' expected.
+typescript_standalone.d.ts(10945,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10945,47): error TS1005: ';' expected.
+typescript_standalone.d.ts(10999,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10999,52): error TS1005: ';' expected.
+typescript_standalone.d.ts(11019,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11019,44): error TS1005: ';' expected.
+typescript_standalone.d.ts(11029,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11029,35): error TS1005: ';' expected.
+typescript_standalone.d.ts(11063,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11063,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11066,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11066,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11070,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11070,45): error TS1005: ';' expected.
+typescript_standalone.d.ts(11088,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11088,56): error TS1005: ';' expected.
+typescript_standalone.d.ts(11114,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11114,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(11117,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11117,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11129,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11129,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11159,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11159,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11193,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11193,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11204,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11204,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11228,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11228,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11236,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11236,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11240,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11240,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11270,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11270,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11313,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11313,41): error TS1005: ';' expected.
+typescript_standalone.d.ts(11500,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11500,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11502,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11502,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11506,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11506,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11508,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11508,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11510,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11510,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11512,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11512,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11514,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11514,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11523,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11523,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11525,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11525,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11527,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11527,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11529,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11529,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11531,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11531,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11533,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11533,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11535,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11535,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11537,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11537,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11539,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11539,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11541,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11541,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11543,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11543,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11545,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11545,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11547,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11547,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11549,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11549,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11551,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11551,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11561,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11561,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11563,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11563,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11565,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11565,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11567,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11567,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11569,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11569,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11571,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11571,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11573,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11573,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11575,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11575,72): error TS1005: ';' expected.
+typescript_standalone.d.ts(11577,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11577,52): error TS1005: ';' expected.
+typescript_standalone.d.ts(11649,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11649,72): error TS1005: ';' expected.
+typescript_standalone.d.ts(11651,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11651,38): error TS1005: ';' expected.
+typescript_standalone.d.ts(11653,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11653,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11729,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11729,48): error TS1005: ';' expected.
+
+
+==== tests/cases/compiler/APISample_jsdoc.ts (0 errors) ====
+    /*
+     * Note: This test is a public API sample. The original sources can be found
+     *       at: https://github.com/YousefED/typescript-json-schema
+     *           https://github.com/vega/ts-json-schema-generator
+     *       Please log a "breaking change" issue for any API breaking change affecting this issue
+     */
+    
+    declare var console: any;
+    
+    import * as ts from "typescript";
+    
+    // excerpted from https://github.com/YousefED/typescript-json-schema
+    // (converted from a method and modified; for example, `this: any` to compensate, among other changes)
+    function parseCommentsIntoDefinition(this: any,
+                                         symbol: ts.Symbol,
+                                         definition: {description?: string, [s: string]: string | undefined},
+                                         otherAnnotations: { [s: string]: true}): void {
+        if (!symbol) {
+            return;
+        }
+    
+        // the comments for a symbol
+        let comments = symbol.getDocumentationComment(undefined);
+    
+        if (comments.length) {
+            definition.description = comments.map(comment => comment.kind === "lineBreak" ? comment.text : comment.text.trim().replace(/\r\n/g, "\n")).join("");
+        }
+    
+        // jsdocs are separate from comments
+        const jsdocs = symbol.getJsDocTags();
+        jsdocs.forEach(doc => {
+            // if we have @TJS-... annotations, we have to parse them
+            const { name, text } = doc;
+            if (this.userValidationKeywords[name]) {
+                definition[name] = this.parseValue(text);
+            } else {
+                // special annotations
+                otherAnnotations[doc.name] = true;
+            }
+        });
+    }
+    
+    
+    // excerpted from https://github.com/vega/ts-json-schema-generator
+    export interface Annotations {
+        [name: string]: any;
+    }
+    function getAnnotations(this: any, node: ts.Node): Annotations | undefined {
+        const symbol: ts.Symbol = (node as any).symbol;
+        if (!symbol) {
+            return undefined;
+        }
+    
+        const jsDocTags: ts.JSDocTagInfo[] = symbol.getJsDocTags();
+        if (!jsDocTags || !jsDocTags.length) {
+            return undefined;
+        }
+    
+        const annotations: Annotations = jsDocTags.reduce((result: Annotations, jsDocTag: ts.JSDocTagInfo) => {
+            const value = this.parseJsDocTag(jsDocTag);
+            if (value !== undefined) {
+                result[jsDocTag.name] = value;
+            }
+    
+            return result;
+        }, {});
+        return Object.keys(annotations).length ? annotations : undefined;
+    }
+    
+    // these examples are artificial and mostly nonsensical
+    function parseSpecificTags(node: ts.Node) {
+        if (node.kind === ts.SyntaxKind.Parameter) {
+            return ts.getJSDocParameterTags(node as ts.ParameterDeclaration);
+        }
+        if (node.kind === ts.SyntaxKind.FunctionDeclaration) {
+            const func = node as ts.FunctionDeclaration;
+            if (ts.hasJSDocParameterTags(func)) {
+                const flat: ts.JSDocTag[] = [];
+                for (const tags of func.parameters.map(ts.getJSDocParameterTags)) {
+                    if (tags) flat.push(...tags);
+                }
+                return flat;
+            }
+        }
+    }
+    
+    function getReturnTypeFromJSDoc(node: ts.Node) {
+        if (node.kind === ts.SyntaxKind.FunctionDeclaration) {
+            return ts.getJSDocReturnType(node);
+        }
+        let type = ts.getJSDocType(node);
+        if (type && type.kind === ts.SyntaxKind.FunctionType) {
+            return (type as ts.FunctionTypeNode).type;
+        }
+    }
+    
+    function getAllTags(node: ts.Node) {
+        ts.getJSDocTags(node);
+    }
+    
+    function getSomeOtherTags(node: ts.Node) {
+        const tags: (ts.JSDocTag | undefined)[] = [];
+        tags.push(ts.getJSDocAugmentsTag(node));
+        tags.push(ts.getJSDocClassTag(node));
+        tags.push(ts.getJSDocReturnTag(node));
+        const type = ts.getJSDocTypeTag(node);
+        if (type) {
+            tags.push(type);
+        }
+        tags.push(ts.getJSDocTemplateTag(node));
+        return tags;
+    }
+    
\ No newline at end of file
diff --git a/tests/baselines/reference/APISample_linter.errors.txt b/tests/baselines/reference/APISample_linter.errors.txt
new file mode 100644
index 00000000000..39c6b1d0d8f
--- /dev/null
+++ b/tests/baselines/reference/APISample_linter.errors.txt
@@ -0,0 +1,194 @@
+typescript_standalone.d.ts(21,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(21,41): error TS1005: ';' expected.
+typescript_standalone.d.ts(8907,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(8907,42): error TS1005: ';' expected.
+typescript_standalone.d.ts(9167,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9167,46): error TS1005: ';' expected.
+typescript_standalone.d.ts(9517,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9517,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(9541,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9541,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(9628,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9628,38): error TS1005: ';' expected.
+typescript_standalone.d.ts(10792,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10792,57): error TS1005: ';' expected.
+typescript_standalone.d.ts(10803,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10803,41): error TS1005: ';' expected.
+typescript_standalone.d.ts(10813,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10813,48): error TS1005: ';' expected.
+typescript_standalone.d.ts(10888,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10888,47): error TS1005: ';' expected.
+typescript_standalone.d.ts(10945,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10945,47): error TS1005: ';' expected.
+typescript_standalone.d.ts(10999,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10999,52): error TS1005: ';' expected.
+typescript_standalone.d.ts(11019,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11019,44): error TS1005: ';' expected.
+typescript_standalone.d.ts(11029,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11029,35): error TS1005: ';' expected.
+typescript_standalone.d.ts(11063,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11063,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11066,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11066,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11070,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11070,45): error TS1005: ';' expected.
+typescript_standalone.d.ts(11088,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11088,56): error TS1005: ';' expected.
+typescript_standalone.d.ts(11114,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11114,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(11117,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11117,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11129,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11129,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11159,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11159,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11193,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11193,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11204,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11204,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11228,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11228,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11236,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11236,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11240,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11240,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11270,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11270,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11313,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11313,41): error TS1005: ';' expected.
+typescript_standalone.d.ts(11500,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11500,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11502,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11502,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11506,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11506,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11508,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11508,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11510,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11510,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11512,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11512,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11514,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11514,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11523,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11523,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11525,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11525,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11527,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11527,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11529,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11529,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11531,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11531,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11533,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11533,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11535,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11535,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11537,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11537,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11539,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11539,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11541,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11541,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11543,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11543,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11545,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11545,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11547,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11547,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11549,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11549,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11551,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11551,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11561,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11561,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11563,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11563,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11565,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11565,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11567,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11567,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11569,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11569,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11571,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11571,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11573,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11573,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11575,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11575,72): error TS1005: ';' expected.
+typescript_standalone.d.ts(11577,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11577,52): error TS1005: ';' expected.
+typescript_standalone.d.ts(11649,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11649,72): error TS1005: ';' expected.
+typescript_standalone.d.ts(11651,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11651,38): error TS1005: ';' expected.
+typescript_standalone.d.ts(11653,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11653,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11729,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11729,48): error TS1005: ';' expected.
+
+
+==== tests/cases/compiler/APISample_linter.ts (0 errors) ====
+    /*
+     * Note: This test is a public API sample. The sample sources can be found 
+             at: https://github.com/Microsoft/TypeScript/wiki/Using-the-Compiler-API#traversing-the-ast-with-a-little-linter
+     *       Please log a "breaking change" issue for any API breaking change affecting this issue
+     */
+    
+    declare var process: any;
+    declare var console: any;
+    declare var readFileSync: any;
+    
+    import * as ts from "typescript";
+    
+    export function delint(sourceFile: ts.SourceFile) {
+        delintNode(sourceFile);
+    
+        function delintNode(node: ts.Node) {
+            switch (node.kind) {
+                case ts.SyntaxKind.ForStatement:
+                case ts.SyntaxKind.ForInStatement:
+                case ts.SyntaxKind.WhileStatement:
+                case ts.SyntaxKind.DoStatement:
+                    if ((<ts.IterationStatement>node).statement.kind !== ts.SyntaxKind.Block) {
+                        report(node, "A looping statement's contents should be wrapped in a block body.");
+                    }
+                    break;
+    
+                case ts.SyntaxKind.IfStatement:
+                    let ifStatement = (<ts.IfStatement>node);
+                    if (ifStatement.thenStatement.kind !== ts.SyntaxKind.Block) {
+                        report(ifStatement.thenStatement, "An if statement's contents should be wrapped in a block body.");
+                    }
+                    if (ifStatement.elseStatement &&
+                        ifStatement.elseStatement.kind !== ts.SyntaxKind.Block &&
+                        ifStatement.elseStatement.kind !== ts.SyntaxKind.IfStatement) {
+                        report(ifStatement.elseStatement, "An else statement's contents should be wrapped in a block body.");
+                    }
+                    break;
+    
+                case ts.SyntaxKind.BinaryExpression:
+                    let op = (<ts.BinaryExpression>node).operatorToken.kind;
+                    if (op === ts.SyntaxKind.EqualsEqualsToken || op == ts.SyntaxKind.ExclamationEqualsToken) {
+                        report(node, "Use '===' and '!=='.")
+                    }
+                    break;
+            }
+    
+            ts.forEachChild(node, delintNode);
+        }
+    
+        function report(node: ts.Node, message: string) {
+            let { line, character } = sourceFile.getLineAndCharacterOfPosition(node.getStart());
+            console.log(`${sourceFile.fileName} (${line + 1},${character + 1}): ${message}`);
+        }
+    }
+    
+    const fileNames: string[] = process.argv.slice(2);
+    fileNames.forEach(fileName => {
+        // Parse a file
+        let sourceFile = ts.createSourceFile(fileName, readFileSync(fileName).toString(), ts.ScriptTarget.ES2015, /*setParentNodes */ true);
+    
+        // delint it
+        delint(sourceFile);
+    });
\ No newline at end of file
diff --git a/tests/baselines/reference/APISample_parseConfig.errors.txt b/tests/baselines/reference/APISample_parseConfig.errors.txt
new file mode 100644
index 00000000000..2cbbf3377f1
--- /dev/null
+++ b/tests/baselines/reference/APISample_parseConfig.errors.txt
@@ -0,0 +1,166 @@
+typescript_standalone.d.ts(21,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(21,41): error TS1005: ';' expected.
+typescript_standalone.d.ts(8907,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(8907,42): error TS1005: ';' expected.
+typescript_standalone.d.ts(9167,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9167,46): error TS1005: ';' expected.
+typescript_standalone.d.ts(9517,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9517,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(9541,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9541,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(9628,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9628,38): error TS1005: ';' expected.
+typescript_standalone.d.ts(10792,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10792,57): error TS1005: ';' expected.
+typescript_standalone.d.ts(10803,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10803,41): error TS1005: ';' expected.
+typescript_standalone.d.ts(10813,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10813,48): error TS1005: ';' expected.
+typescript_standalone.d.ts(10888,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10888,47): error TS1005: ';' expected.
+typescript_standalone.d.ts(10945,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10945,47): error TS1005: ';' expected.
+typescript_standalone.d.ts(10999,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10999,52): error TS1005: ';' expected.
+typescript_standalone.d.ts(11019,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11019,44): error TS1005: ';' expected.
+typescript_standalone.d.ts(11029,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11029,35): error TS1005: ';' expected.
+typescript_standalone.d.ts(11063,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11063,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11066,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11066,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11070,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11070,45): error TS1005: ';' expected.
+typescript_standalone.d.ts(11088,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11088,56): error TS1005: ';' expected.
+typescript_standalone.d.ts(11114,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11114,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(11117,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11117,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11129,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11129,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11159,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11159,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11193,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11193,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11204,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11204,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11228,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11228,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11236,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11236,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11240,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11240,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11270,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11270,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11313,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11313,41): error TS1005: ';' expected.
+typescript_standalone.d.ts(11500,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11500,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11502,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11502,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11506,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11506,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11508,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11508,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11510,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11510,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11512,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11512,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11514,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11514,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11523,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11523,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11525,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11525,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11527,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11527,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11529,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11529,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11531,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11531,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11533,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11533,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11535,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11535,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11537,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11537,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11539,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11539,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11541,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11541,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11543,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11543,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11545,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11545,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11547,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11547,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11549,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11549,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11551,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11551,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11561,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11561,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11563,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11563,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11565,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11565,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11567,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11567,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11569,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11569,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11571,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11571,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11573,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11573,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11575,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11575,72): error TS1005: ';' expected.
+typescript_standalone.d.ts(11577,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11577,52): error TS1005: ';' expected.
+typescript_standalone.d.ts(11649,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11649,72): error TS1005: ';' expected.
+typescript_standalone.d.ts(11651,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11651,38): error TS1005: ';' expected.
+typescript_standalone.d.ts(11653,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11653,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11729,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11729,48): error TS1005: ';' expected.
+
+
+==== tests/cases/compiler/APISample_parseConfig.ts (0 errors) ====
+    /*
+     * Note: This test is a public API sample. The sample sources can be found 
+             at: https://github.com/Microsoft/TypeScript/wiki/Using-the-Compiler-API#a-minimal-compiler
+     *       Please log a "breaking change" issue for any API breaking change affecting this issue
+     */
+    
+    declare var process: any;
+    declare var console: any;
+    declare var os: any;
+    
+    import ts = require("typescript");
+    
+    function printError(error: ts.Diagnostic): void {
+        if (!error) {
+            return;
+        }
+        console.log(`${error.file && error.file.fileName}: ${error.messageText}`);
+    }
+    
+    export function createProgram(rootFiles: string[], compilerOptionsJson: string): ts.Program | undefined {
+        const { config, error } = ts.parseConfigFileTextToJson("tsconfig.json", compilerOptionsJson)
+        if (error) {
+            printError(error);
+            return undefined;
+        }
+        const basePath: string = process.cwd();
+        const settings = ts.convertCompilerOptionsFromJson(config.config["compilerOptions"], basePath);
+        if (!settings.options) {
+            for (const err of settings.errors) {
+                printError(err);
+            }
+            return undefined;
+        }
+        return ts.createProgram(rootFiles, settings.options);
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/APISample_transform.errors.txt b/tests/baselines/reference/APISample_transform.errors.txt
new file mode 100644
index 00000000000..477fd00d731
--- /dev/null
+++ b/tests/baselines/reference/APISample_transform.errors.txt
@@ -0,0 +1,146 @@
+typescript_standalone.d.ts(21,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(21,41): error TS1005: ';' expected.
+typescript_standalone.d.ts(8907,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(8907,42): error TS1005: ';' expected.
+typescript_standalone.d.ts(9167,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9167,46): error TS1005: ';' expected.
+typescript_standalone.d.ts(9517,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9517,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(9541,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9541,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(9628,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9628,38): error TS1005: ';' expected.
+typescript_standalone.d.ts(10792,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10792,57): error TS1005: ';' expected.
+typescript_standalone.d.ts(10803,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10803,41): error TS1005: ';' expected.
+typescript_standalone.d.ts(10813,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10813,48): error TS1005: ';' expected.
+typescript_standalone.d.ts(10888,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10888,47): error TS1005: ';' expected.
+typescript_standalone.d.ts(10945,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10945,47): error TS1005: ';' expected.
+typescript_standalone.d.ts(10999,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10999,52): error TS1005: ';' expected.
+typescript_standalone.d.ts(11019,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11019,44): error TS1005: ';' expected.
+typescript_standalone.d.ts(11029,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11029,35): error TS1005: ';' expected.
+typescript_standalone.d.ts(11063,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11063,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11066,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11066,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11070,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11070,45): error TS1005: ';' expected.
+typescript_standalone.d.ts(11088,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11088,56): error TS1005: ';' expected.
+typescript_standalone.d.ts(11114,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11114,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(11117,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11117,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11129,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11129,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11159,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11159,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11193,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11193,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11204,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11204,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11228,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11228,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11236,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11236,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11240,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11240,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11270,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11270,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11313,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11313,41): error TS1005: ';' expected.
+typescript_standalone.d.ts(11500,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11500,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11502,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11502,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11506,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11506,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11508,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11508,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11510,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11510,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11512,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11512,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11514,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11514,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11523,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11523,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11525,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11525,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11527,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11527,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11529,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11529,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11531,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11531,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11533,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11533,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11535,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11535,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11537,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11537,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11539,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11539,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11541,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11541,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11543,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11543,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11545,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11545,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11547,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11547,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11549,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11549,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11551,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11551,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11561,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11561,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11563,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11563,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11565,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11565,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11567,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11567,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11569,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11569,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11571,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11571,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11573,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11573,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11575,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11575,72): error TS1005: ';' expected.
+typescript_standalone.d.ts(11577,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11577,52): error TS1005: ';' expected.
+typescript_standalone.d.ts(11649,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11649,72): error TS1005: ';' expected.
+typescript_standalone.d.ts(11651,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11651,38): error TS1005: ';' expected.
+typescript_standalone.d.ts(11653,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11653,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11729,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11729,48): error TS1005: ';' expected.
+
+
+==== tests/cases/compiler/APISample_transform.ts (0 errors) ====
+    /*
+     * Note: This test is a public API sample. The sample sources can be found 
+             at: https://github.com/Microsoft/TypeScript/wiki/Using-the-Compiler-API#a-simple-transform-function
+     *       Please log a "breaking change" issue for any API breaking change affecting this issue
+     */
+    
+    declare var console: any;
+    
+    import * as ts from "typescript";
+    
+    const source = "let x: string  = 'string'";
+    
+    let result = ts.transpile(source, { module: ts.ModuleKind.CommonJS });
+    
+    console.log(JSON.stringify(result));
\ No newline at end of file
diff --git a/tests/baselines/reference/APISample_watcher.errors.txt b/tests/baselines/reference/APISample_watcher.errors.txt
new file mode 100644
index 00000000000..6f9d853dde7
--- /dev/null
+++ b/tests/baselines/reference/APISample_watcher.errors.txt
@@ -0,0 +1,240 @@
+typescript_standalone.d.ts(21,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(21,41): error TS1005: ';' expected.
+typescript_standalone.d.ts(8907,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(8907,42): error TS1005: ';' expected.
+typescript_standalone.d.ts(9167,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9167,46): error TS1005: ';' expected.
+typescript_standalone.d.ts(9517,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9517,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(9541,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9541,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(9628,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9628,38): error TS1005: ';' expected.
+typescript_standalone.d.ts(10792,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10792,57): error TS1005: ';' expected.
+typescript_standalone.d.ts(10803,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10803,41): error TS1005: ';' expected.
+typescript_standalone.d.ts(10813,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10813,48): error TS1005: ';' expected.
+typescript_standalone.d.ts(10888,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10888,47): error TS1005: ';' expected.
+typescript_standalone.d.ts(10945,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10945,47): error TS1005: ';' expected.
+typescript_standalone.d.ts(10999,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10999,52): error TS1005: ';' expected.
+typescript_standalone.d.ts(11019,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11019,44): error TS1005: ';' expected.
+typescript_standalone.d.ts(11029,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11029,35): error TS1005: ';' expected.
+typescript_standalone.d.ts(11063,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11063,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11066,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11066,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11070,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11070,45): error TS1005: ';' expected.
+typescript_standalone.d.ts(11088,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11088,56): error TS1005: ';' expected.
+typescript_standalone.d.ts(11114,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11114,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(11117,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11117,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11129,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11129,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11159,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11159,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11193,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11193,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11204,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11204,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11228,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11228,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11236,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11236,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11240,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11240,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11270,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11270,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11313,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11313,41): error TS1005: ';' expected.
+typescript_standalone.d.ts(11500,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11500,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11502,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11502,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11506,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11506,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11508,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11508,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11510,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11510,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11512,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11512,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11514,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11514,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11523,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11523,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11525,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11525,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11527,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11527,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11529,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11529,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11531,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11531,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11533,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11533,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11535,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11535,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11537,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11537,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11539,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11539,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11541,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11541,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11543,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11543,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11545,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11545,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11547,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11547,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11549,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11549,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11551,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11551,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11561,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11561,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11563,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11563,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11565,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11565,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11567,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11567,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11569,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11569,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11571,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11571,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11573,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11573,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11575,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11575,72): error TS1005: ';' expected.
+typescript_standalone.d.ts(11577,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11577,52): error TS1005: ';' expected.
+typescript_standalone.d.ts(11649,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11649,72): error TS1005: ';' expected.
+typescript_standalone.d.ts(11651,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11651,38): error TS1005: ';' expected.
+typescript_standalone.d.ts(11653,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11653,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11729,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11729,48): error TS1005: ';' expected.
+
+
+==== tests/cases/compiler/APISample_watcher.ts (0 errors) ====
+    /*
+     * Note: This test is a public API sample. The sample sources can be found
+             at: https://github.com/Microsoft/TypeScript/wiki/Using-the-Compiler-API#incremental-build-support-using-the-language-services
+     *       Please log a "breaking change" issue for any API breaking change affecting this issue
+     */
+    
+    declare var process: any;
+    declare var console: any;
+    declare var fs: {
+        existsSync(path: string): boolean;
+        readdirSync(path: string): string[];
+        readFileSync(filename: string, encoding?: string): string;
+        writeFileSync(filename: string, data: any, options?: { encoding?: string; mode?: number; flag?: string; } | string): void;
+        watchFile(filename: string, options: { persistent?: boolean; interval?: number; }, listener: (curr: { mtime: Date }, prev: { mtime: Date }) => void): void;
+    };
+    declare var path: any;
+    
+    import * as ts from "typescript";
+    
+    function watch(rootFileNames: string[], options: ts.CompilerOptions) {
+        const files: ts.MapLike<{ version: number }> = {};
+    
+        // initialize the list of files
+        rootFileNames.forEach(fileName => {
+            files[fileName] = { version: 0 };
+        });
+    
+        // Create the language service host to allow the LS to communicate with the host
+        const servicesHost: ts.LanguageServiceHost = {
+            getScriptFileNames: () => rootFileNames,
+            getScriptVersion: (fileName) => files[fileName] && files[fileName].version.toString(),
+            getScriptSnapshot: (fileName) => {
+                if (!fs.existsSync(fileName)) {
+                    return undefined;
+                }
+    
+                return ts.ScriptSnapshot.fromString(fs.readFileSync(fileName).toString());
+            },
+            getCurrentDirectory: () => process.cwd(),
+            getCompilationSettings: () => options,
+            getDefaultLibFileName: (options) => ts.getDefaultLibFilePath(options),
+        };
+    
+        // Create the language service files
+        const services = ts.createLanguageService(servicesHost, ts.createDocumentRegistry())
+    
+        // Now let's watch the files
+        rootFileNames.forEach(fileName => {
+            // First time around, emit all files
+            emitFile(fileName);
+    
+            // Add a watch on the file to handle next change
+            fs.watchFile(fileName,
+                { persistent: true, interval: 250 },
+                (curr, prev) => {
+                    // Check timestamp
+                    if (+curr.mtime <= +prev.mtime) {
+                        return;
+                    }
+    
+                    // Update the version to signal a change in the file
+                    files[fileName].version++;
+    
+                    // write the changes to disk
+                    emitFile(fileName);
+                });
+        });
+    
+        function emitFile(fileName: string) {
+            let output = services.getEmitOutput(fileName);
+    
+            if (!output.emitSkipped) {
+                console.log(`Emitting ${fileName}`);
+            }
+            else {
+                console.log(`Emitting ${fileName} failed`);
+                logErrors(fileName);
+            }
+    
+            output.outputFiles.forEach(o => {
+                fs.writeFileSync(o.name, o.text, "utf8");
+            });
+        }
+    
+        function logErrors(fileName: string) {
+            let allDiagnostics = services.getCompilerOptionsDiagnostics()
+                .concat(services.getSyntacticDiagnostics(fileName))
+                .concat(services.getSemanticDiagnostics(fileName));
+    
+            allDiagnostics.forEach(diagnostic => {
+                let message = ts.flattenDiagnosticMessageText(diagnostic.messageText, "\n");
+                if (diagnostic.file) {
+                    let { line, character } = diagnostic.file.getLineAndCharacterOfPosition(diagnostic.start!);
+                    console.log(`  Error ${diagnostic.file.fileName} (${line + 1},${character + 1}): ${message}`);
+                }
+                else {
+                    console.log(`  Error: ${message}`);
+                }
+            });
+        }
+    }
+    
+    // Initialize files constituting the program as all .ts files in the current directory
+    const currentDirectoryFiles = fs.readdirSync(process.cwd()).
+        filter(fileName=> fileName.length >= 3 && fileName.substr(fileName.length - 3, 3) === ".ts");
+    
+    // Start the watcher
+    watch(currentDirectoryFiles, { module: ts.ModuleKind.CommonJS });
+    
\ No newline at end of file
diff --git a/tests/baselines/reference/api/tsserverlibrary.d.ts b/tests/baselines/reference/api/tsserverlibrary.d.ts
index 2cfb99444e5..f3b22d14bc0 100644
--- a/tests/baselines/reference/api/tsserverlibrary.d.ts
+++ b/tests/baselines/reference/api/tsserverlibrary.d.ts
@@ -13,8592 +13,14114 @@ See the Apache Version 2.0 License for specific language governing permissions
 and limitations under the License.
 ***************************************************************************** */
 
-declare namespace ts {
-    /**
-     * Type of objects whose values are all of the same type.
-     * The `in` and `for-in` operators can *not* be safely used,
-     * since `Object.prototype` may be modified by outside code.
-     */
-    interface MapLike<T> {
-        [index: string]: T;
-    }
-    /** ES6 Map interface, only read methods included. */
-    interface ReadonlyMap<T> {
-        get(key: string): T | undefined;
-        has(key: string): boolean;
-        forEach(action: (value: T, key: string) => void): void;
-        readonly size: number;
-        keys(): Iterator<string>;
-        values(): Iterator<T>;
-        entries(): Iterator<[string, T]>;
-    }
-    /** ES6 Map interface. */
-    interface Map<T> extends ReadonlyMap<T> {
-        set(key: string, value: T): this;
-        delete(key: string): boolean;
-        clear(): void;
-    }
-    /** ES6 Iterator type. */
-    interface Iterator<T> {
-        next(): {
-            value: T;
-            done: false;
-        } | {
-            value: never;
-            done: true;
-        };
-    }
-    /** Array that is only intended to be pushed to, never read. */
-    interface Push<T> {
-        push(...values: T[]): void;
-    }
-    type Path = string & {
-        __pathBrand: any;
-    };
-    interface TextRange {
-        pos: number;
-        end: number;
-    }
-    type JsDocSyntaxKind = SyntaxKind.EndOfFileToken | SyntaxKind.WhitespaceTrivia | SyntaxKind.AtToken | SyntaxKind.NewLineTrivia | SyntaxKind.AsteriskToken | SyntaxKind.OpenBraceToken | SyntaxKind.CloseBraceToken | SyntaxKind.LessThanToken | SyntaxKind.OpenBracketToken | SyntaxKind.CloseBracketToken | SyntaxKind.EqualsToken | SyntaxKind.CommaToken | SyntaxKind.DotToken | SyntaxKind.Identifier | SyntaxKind.NoSubstitutionTemplateLiteral | SyntaxKind.Unknown;
-    type JsxTokenSyntaxKind = SyntaxKind.LessThanSlashToken | SyntaxKind.EndOfFileToken | SyntaxKind.ConflictMarkerTrivia | SyntaxKind.JsxText | SyntaxKind.JsxTextAllWhiteSpaces | SyntaxKind.OpenBraceToken | SyntaxKind.LessThanToken;
-    enum SyntaxKind {
-        Unknown = 0,
-        EndOfFileToken = 1,
-        SingleLineCommentTrivia = 2,
-        MultiLineCommentTrivia = 3,
-        NewLineTrivia = 4,
-        WhitespaceTrivia = 5,
-        ShebangTrivia = 6,
-        ConflictMarkerTrivia = 7,
-        NumericLiteral = 8,
-        StringLiteral = 9,
-        JsxText = 10,
-        JsxTextAllWhiteSpaces = 11,
-        RegularExpressionLiteral = 12,
-        NoSubstitutionTemplateLiteral = 13,
-        TemplateHead = 14,
-        TemplateMiddle = 15,
-        TemplateTail = 16,
-        OpenBraceToken = 17,
-        CloseBraceToken = 18,
-        OpenParenToken = 19,
-        CloseParenToken = 20,
-        OpenBracketToken = 21,
-        CloseBracketToken = 22,
-        DotToken = 23,
-        DotDotDotToken = 24,
-        SemicolonToken = 25,
-        CommaToken = 26,
-        LessThanToken = 27,
-        LessThanSlashToken = 28,
-        GreaterThanToken = 29,
-        LessThanEqualsToken = 30,
-        GreaterThanEqualsToken = 31,
-        EqualsEqualsToken = 32,
-        ExclamationEqualsToken = 33,
-        EqualsEqualsEqualsToken = 34,
-        ExclamationEqualsEqualsToken = 35,
-        EqualsGreaterThanToken = 36,
-        PlusToken = 37,
-        MinusToken = 38,
-        AsteriskToken = 39,
-        AsteriskAsteriskToken = 40,
-        SlashToken = 41,
-        PercentToken = 42,
-        PlusPlusToken = 43,
-        MinusMinusToken = 44,
-        LessThanLessThanToken = 45,
-        GreaterThanGreaterThanToken = 46,
-        GreaterThanGreaterThanGreaterThanToken = 47,
-        AmpersandToken = 48,
-        BarToken = 49,
-        CaretToken = 50,
-        ExclamationToken = 51,
-        TildeToken = 52,
-        AmpersandAmpersandToken = 53,
-        BarBarToken = 54,
-        QuestionToken = 55,
-        ColonToken = 56,
-        AtToken = 57,
-        EqualsToken = 58,
-        PlusEqualsToken = 59,
-        MinusEqualsToken = 60,
-        AsteriskEqualsToken = 61,
-        AsteriskAsteriskEqualsToken = 62,
-        SlashEqualsToken = 63,
-        PercentEqualsToken = 64,
-        LessThanLessThanEqualsToken = 65,
-        GreaterThanGreaterThanEqualsToken = 66,
-        GreaterThanGreaterThanGreaterThanEqualsToken = 67,
-        AmpersandEqualsToken = 68,
-        BarEqualsToken = 69,
-        CaretEqualsToken = 70,
-        Identifier = 71,
-        BreakKeyword = 72,
-        CaseKeyword = 73,
-        CatchKeyword = 74,
-        ClassKeyword = 75,
-        ConstKeyword = 76,
-        ContinueKeyword = 77,
-        DebuggerKeyword = 78,
-        DefaultKeyword = 79,
-        DeleteKeyword = 80,
-        DoKeyword = 81,
-        ElseKeyword = 82,
-        EnumKeyword = 83,
-        ExportKeyword = 84,
-        ExtendsKeyword = 85,
-        FalseKeyword = 86,
-        FinallyKeyword = 87,
-        ForKeyword = 88,
-        FunctionKeyword = 89,
-        IfKeyword = 90,
-        ImportKeyword = 91,
-        InKeyword = 92,
-        InstanceOfKeyword = 93,
-        NewKeyword = 94,
-        NullKeyword = 95,
-        ReturnKeyword = 96,
-        SuperKeyword = 97,
-        SwitchKeyword = 98,
-        ThisKeyword = 99,
-        ThrowKeyword = 100,
-        TrueKeyword = 101,
-        TryKeyword = 102,
-        TypeOfKeyword = 103,
-        VarKeyword = 104,
-        VoidKeyword = 105,
-        WhileKeyword = 106,
-        WithKeyword = 107,
-        ImplementsKeyword = 108,
-        InterfaceKeyword = 109,
-        LetKeyword = 110,
-        PackageKeyword = 111,
-        PrivateKeyword = 112,
-        ProtectedKeyword = 113,
-        PublicKeyword = 114,
-        StaticKeyword = 115,
-        YieldKeyword = 116,
-        AbstractKeyword = 117,
-        AsKeyword = 118,
-        AnyKeyword = 119,
-        AsyncKeyword = 120,
-        AwaitKeyword = 121,
-        BooleanKeyword = 122,
-        ConstructorKeyword = 123,
-        DeclareKeyword = 124,
-        GetKeyword = 125,
-        InferKeyword = 126,
-        IsKeyword = 127,
-        KeyOfKeyword = 128,
-        ModuleKeyword = 129,
-        NamespaceKeyword = 130,
-        NeverKeyword = 131,
-        ReadonlyKeyword = 132,
-        RequireKeyword = 133,
-        NumberKeyword = 134,
-        ObjectKeyword = 135,
-        SetKeyword = 136,
-        StringKeyword = 137,
-        SymbolKeyword = 138,
-        TypeKeyword = 139,
-        UndefinedKeyword = 140,
-        UniqueKeyword = 141,
-        UnknownKeyword = 142,
-        FromKeyword = 143,
-        GlobalKeyword = 144,
-        OfKeyword = 145,
-        QualifiedName = 146,
-        ComputedPropertyName = 147,
-        TypeParameter = 148,
-        Parameter = 149,
-        Decorator = 150,
-        PropertySignature = 151,
-        PropertyDeclaration = 152,
-        MethodSignature = 153,
-        MethodDeclaration = 154,
-        Constructor = 155,
-        GetAccessor = 156,
-        SetAccessor = 157,
-        CallSignature = 158,
-        ConstructSignature = 159,
-        IndexSignature = 160,
-        TypePredicate = 161,
-        TypeReference = 162,
-        FunctionType = 163,
-        ConstructorType = 164,
-        TypeQuery = 165,
-        TypeLiteral = 166,
-        ArrayType = 167,
-        TupleType = 168,
-        UnionType = 169,
-        IntersectionType = 170,
-        ConditionalType = 171,
-        InferType = 172,
-        ParenthesizedType = 173,
-        ThisType = 174,
-        TypeOperator = 175,
-        IndexedAccessType = 176,
-        MappedType = 177,
-        LiteralType = 178,
-        ImportType = 179,
-        ObjectBindingPattern = 180,
-        ArrayBindingPattern = 181,
-        BindingElement = 182,
-        ArrayLiteralExpression = 183,
-        ObjectLiteralExpression = 184,
-        PropertyAccessExpression = 185,
-        ElementAccessExpression = 186,
-        CallExpression = 187,
-        NewExpression = 188,
-        TaggedTemplateExpression = 189,
-        TypeAssertionExpression = 190,
-        ParenthesizedExpression = 191,
-        FunctionExpression = 192,
-        ArrowFunction = 193,
-        DeleteExpression = 194,
-        TypeOfExpression = 195,
-        VoidExpression = 196,
-        AwaitExpression = 197,
-        PrefixUnaryExpression = 198,
-        PostfixUnaryExpression = 199,
-        BinaryExpression = 200,
-        ConditionalExpression = 201,
-        TemplateExpression = 202,
-        YieldExpression = 203,
-        SpreadElement = 204,
-        ClassExpression = 205,
-        OmittedExpression = 206,
-        ExpressionWithTypeArguments = 207,
-        AsExpression = 208,
-        NonNullExpression = 209,
-        MetaProperty = 210,
-        TemplateSpan = 211,
-        SemicolonClassElement = 212,
-        Block = 213,
-        VariableStatement = 214,
-        EmptyStatement = 215,
-        ExpressionStatement = 216,
-        IfStatement = 217,
-        DoStatement = 218,
-        WhileStatement = 219,
-        ForStatement = 220,
-        ForInStatement = 221,
-        ForOfStatement = 222,
-        ContinueStatement = 223,
-        BreakStatement = 224,
-        ReturnStatement = 225,
-        WithStatement = 226,
-        SwitchStatement = 227,
-        LabeledStatement = 228,
-        ThrowStatement = 229,
-        TryStatement = 230,
-        DebuggerStatement = 231,
-        VariableDeclaration = 232,
-        VariableDeclarationList = 233,
-        FunctionDeclaration = 234,
-        ClassDeclaration = 235,
-        InterfaceDeclaration = 236,
-        TypeAliasDeclaration = 237,
-        EnumDeclaration = 238,
-        ModuleDeclaration = 239,
-        ModuleBlock = 240,
-        CaseBlock = 241,
-        NamespaceExportDeclaration = 242,
-        ImportEqualsDeclaration = 243,
-        ImportDeclaration = 244,
-        ImportClause = 245,
-        NamespaceImport = 246,
-        NamedImports = 247,
-        ImportSpecifier = 248,
-        ExportAssignment = 249,
-        ExportDeclaration = 250,
-        NamedExports = 251,
-        ExportSpecifier = 252,
-        MissingDeclaration = 253,
-        ExternalModuleReference = 254,
-        JsxElement = 255,
-        JsxSelfClosingElement = 256,
-        JsxOpeningElement = 257,
-        JsxClosingElement = 258,
-        JsxFragment = 259,
-        JsxOpeningFragment = 260,
-        JsxClosingFragment = 261,
-        JsxAttribute = 262,
-        JsxAttributes = 263,
-        JsxSpreadAttribute = 264,
-        JsxExpression = 265,
-        CaseClause = 266,
-        DefaultClause = 267,
-        HeritageClause = 268,
-        CatchClause = 269,
-        PropertyAssignment = 270,
-        ShorthandPropertyAssignment = 271,
-        SpreadAssignment = 272,
-        EnumMember = 273,
-        SourceFile = 274,
-        Bundle = 275,
-        UnparsedSource = 276,
-        InputFiles = 277,
-        JSDocTypeExpression = 278,
-        JSDocAllType = 279,
-        JSDocUnknownType = 280,
-        JSDocNullableType = 281,
-        JSDocNonNullableType = 282,
-        JSDocOptionalType = 283,
-        JSDocFunctionType = 284,
-        JSDocVariadicType = 285,
-        JSDocComment = 286,
-        JSDocTypeLiteral = 287,
-        JSDocSignature = 288,
-        JSDocTag = 289,
-        JSDocAugmentsTag = 290,
-        JSDocClassTag = 291,
-        JSDocCallbackTag = 292,
-        JSDocParameterTag = 293,
-        JSDocReturnTag = 294,
-        JSDocTypeTag = 295,
-        JSDocTemplateTag = 296,
-        JSDocTypedefTag = 297,
-        JSDocPropertyTag = 298,
-        SyntaxList = 299,
-        NotEmittedStatement = 300,
-        PartiallyEmittedExpression = 301,
-        CommaListExpression = 302,
-        MergeDeclarationMarker = 303,
-        EndOfDeclarationMarker = 304,
-        Count = 305,
-        FirstAssignment = 58,
-        LastAssignment = 70,
-        FirstCompoundAssignment = 59,
-        LastCompoundAssignment = 70,
-        FirstReservedWord = 72,
-        LastReservedWord = 107,
-        FirstKeyword = 72,
-        LastKeyword = 145,
-        FirstFutureReservedWord = 108,
-        LastFutureReservedWord = 116,
-        FirstTypeNode = 161,
-        LastTypeNode = 179,
-        FirstPunctuation = 17,
-        LastPunctuation = 70,
-        FirstToken = 0,
-        LastToken = 145,
-        FirstTriviaToken = 2,
-        LastTriviaToken = 7,
-        FirstLiteralToken = 8,
-        LastLiteralToken = 13,
-        FirstTemplateToken = 13,
-        LastTemplateToken = 16,
-        FirstBinaryOperator = 27,
-        LastBinaryOperator = 70,
-        FirstNode = 146,
-        FirstJSDocNode = 278,
-        LastJSDocNode = 298,
-        FirstJSDocTagNode = 289,
-        LastJSDocTagNode = 298
-    }
-    enum NodeFlags {
-        None = 0,
-        Let = 1,
-        Const = 2,
-        NestedNamespace = 4,
-        Synthesized = 8,
-        Namespace = 16,
-        ExportContext = 32,
-        ContainsThis = 64,
-        HasImplicitReturn = 128,
-        HasExplicitReturn = 256,
-        GlobalAugmentation = 512,
-        HasAsyncFunctions = 1024,
-        DisallowInContext = 2048,
-        YieldContext = 4096,
-        DecoratorContext = 8192,
-        AwaitContext = 16384,
-        ThisNodeHasError = 32768,
-        JavaScriptFile = 65536,
-        ThisNodeOrAnySubNodesHasError = 131072,
-        HasAggregatedChildData = 262144,
-        JSDoc = 2097152,
-        JsonFile = 16777216,
-        BlockScoped = 3,
-        ReachabilityCheckFlags = 384,
-        ReachabilityAndEmitFlags = 1408,
-        ContextFlags = 12679168,
-        TypeExcludesFlags = 20480
-    }
-    enum ModifierFlags {
-        None = 0,
-        Export = 1,
-        Ambient = 2,
-        Public = 4,
-        Private = 8,
-        Protected = 16,
-        Static = 32,
-        Readonly = 64,
-        Abstract = 128,
-        Async = 256,
-        Default = 512,
-        Const = 2048,
-        HasComputedFlags = 536870912,
-        AccessibilityModifier = 28,
-        ParameterPropertyModifier = 92,
-        NonPublicAccessibilityModifier = 24,
-        TypeScriptModifier = 2270,
-        ExportDefault = 513,
-        All = 3071
-    }
-    enum JsxFlags {
-        None = 0,
-        /** An element from a named property of the JSX.IntrinsicElements interface */
-        IntrinsicNamedElement = 1,
-        /** An element inferred from the string index signature of the JSX.IntrinsicElements interface */
-        IntrinsicIndexedElement = 2,
-        IntrinsicElement = 3
-    }
-    interface Node extends TextRange {
-        kind: SyntaxKind;
-        flags: NodeFlags;
-        decorators?: NodeArray<Decorator>;
-        modifiers?: ModifiersArray;
-        parent: Node;
-    }
-    interface JSDocContainer {
-    }
-    type HasJSDoc = ParameterDeclaration | CallSignatureDeclaration | ConstructSignatureDeclaration | MethodSignature | PropertySignature | ArrowFunction | ParenthesizedExpression | SpreadAssignment | ShorthandPropertyAssignment | PropertyAssignment | FunctionExpression | LabeledStatement | ExpressionStatement | VariableStatement | FunctionDeclaration | ConstructorDeclaration | MethodDeclaration | PropertyDeclaration | AccessorDeclaration | ClassLikeDeclaration | InterfaceDeclaration | TypeAliasDeclaration | EnumMember | EnumDeclaration | ModuleDeclaration | ImportEqualsDeclaration | IndexSignatureDeclaration | FunctionTypeNode | ConstructorTypeNode | JSDocFunctionType | EndOfFileToken;
-    type HasType = SignatureDeclaration | VariableDeclaration | ParameterDeclaration | PropertySignature | PropertyDeclaration | TypePredicateNode | ParenthesizedTypeNode | TypeOperatorNode | MappedTypeNode | AssertionExpression | TypeAliasDeclaration | JSDocTypeExpression | JSDocNonNullableType | JSDocNullableType | JSDocOptionalType | JSDocVariadicType;
-    type HasInitializer = HasExpressionInitializer | ForStatement | ForInStatement | ForOfStatement | JsxAttribute;
-    type HasExpressionInitializer = VariableDeclaration | ParameterDeclaration | BindingElement | PropertySignature | PropertyDeclaration | PropertyAssignment | EnumMember;
-    interface NodeArray<T extends Node> extends ReadonlyArray<T>, TextRange {
-        hasTrailingComma?: boolean;
-    }
-    interface Token<TKind extends SyntaxKind> extends Node {
-        kind: TKind;
-    }
-    type DotDotDotToken = Token<SyntaxKind.DotDotDotToken>;
-    type QuestionToken = Token<SyntaxKind.QuestionToken>;
-    type ExclamationToken = Token<SyntaxKind.ExclamationToken>;
-    type ColonToken = Token<SyntaxKind.ColonToken>;
-    type EqualsToken = Token<SyntaxKind.EqualsToken>;
-    type AsteriskToken = Token<SyntaxKind.AsteriskToken>;
-    type EqualsGreaterThanToken = Token<SyntaxKind.EqualsGreaterThanToken>;
-    type EndOfFileToken = Token<SyntaxKind.EndOfFileToken> & JSDocContainer;
-    type AtToken = Token<SyntaxKind.AtToken>;
-    type ReadonlyToken = Token<SyntaxKind.ReadonlyKeyword>;
-    type AwaitKeywordToken = Token<SyntaxKind.AwaitKeyword>;
-    type PlusToken = Token<SyntaxKind.PlusToken>;
-    type MinusToken = Token<SyntaxKind.MinusToken>;
-    type Modifier = Token<SyntaxKind.AbstractKeyword> | Token<SyntaxKind.AsyncKeyword> | Token<SyntaxKind.ConstKeyword> | Token<SyntaxKind.DeclareKeyword> | Token<SyntaxKind.DefaultKeyword> | Token<SyntaxKind.ExportKeyword> | Token<SyntaxKind.PublicKeyword> | Token<SyntaxKind.PrivateKeyword> | Token<SyntaxKind.ProtectedKeyword> | Token<SyntaxKind.ReadonlyKeyword> | Token<SyntaxKind.StaticKeyword>;
-    type ModifiersArray = NodeArray<Modifier>;
-    interface Identifier extends PrimaryExpression, Declaration {
-        kind: SyntaxKind.Identifier;
-        /**
-         * Prefer to use `id.unescapedText`. (Note: This is available only in services, not internally to the TypeScript compiler.)
-         * Text of identifier, but if the identifier begins with two underscores, this will begin with three.
-         */
-        escapedText: __String;
-        originalKeywordKind?: SyntaxKind;
-        isInJSDocNamespace?: boolean;
-    }
-    interface TransientIdentifier extends Identifier {
-        resolvedSymbol: Symbol;
-    }
-    interface QualifiedName extends Node {
-        kind: SyntaxKind.QualifiedName;
-        left: EntityName;
-        right: Identifier;
-    }
-    type EntityName = Identifier | QualifiedName;
-    type PropertyName = Identifier | StringLiteral | NumericLiteral | ComputedPropertyName;
-    type DeclarationName = Identifier | StringLiteral | NumericLiteral | ComputedPropertyName | BindingPattern;
-    interface Declaration extends Node {
-        _declarationBrand: any;
-    }
-    interface NamedDeclaration extends Declaration {
-        name?: DeclarationName;
-    }
-    interface DeclarationStatement extends NamedDeclaration, Statement {
-        name?: Identifier | StringLiteral | NumericLiteral;
-    }
-    interface ComputedPropertyName extends Node {
-        kind: SyntaxKind.ComputedPropertyName;
-        expression: Expression;
-    }
-    interface Decorator extends Node {
-        kind: SyntaxKind.Decorator;
-        parent: NamedDeclaration;
-        expression: LeftHandSideExpression;
-    }
-    interface TypeParameterDeclaration extends NamedDeclaration {
-        kind: SyntaxKind.TypeParameter;
-        parent: DeclarationWithTypeParameters | InferTypeNode;
-        name: Identifier;
-        constraint?: TypeNode;
-        default?: TypeNode;
-        expression?: Expression;
-    }
-    interface SignatureDeclarationBase extends NamedDeclaration, JSDocContainer {
-        kind: SignatureDeclaration["kind"];
-        name?: PropertyName;
-        typeParameters?: NodeArray<TypeParameterDeclaration>;
-        parameters: NodeArray<ParameterDeclaration>;
-        type?: TypeNode;
-    }
-    type SignatureDeclaration = CallSignatureDeclaration | ConstructSignatureDeclaration | MethodSignature | IndexSignatureDeclaration | FunctionTypeNode | ConstructorTypeNode | JSDocFunctionType | FunctionDeclaration | MethodDeclaration | ConstructorDeclaration | AccessorDeclaration | FunctionExpression | ArrowFunction;
-    interface CallSignatureDeclaration extends SignatureDeclarationBase, TypeElement {
-        kind: SyntaxKind.CallSignature;
-    }
-    interface ConstructSignatureDeclaration extends SignatureDeclarationBase, TypeElement {
-        kind: SyntaxKind.ConstructSignature;
-    }
-    type BindingName = Identifier | BindingPattern;
-    interface VariableDeclaration extends NamedDeclaration {
-        kind: SyntaxKind.VariableDeclaration;
-        parent: VariableDeclarationList | CatchClause;
-        name: BindingName;
-        exclamationToken?: ExclamationToken;
-        type?: TypeNode;
-        initializer?: Expression;
-    }
-    interface VariableDeclarationList extends Node {
-        kind: SyntaxKind.VariableDeclarationList;
-        parent: VariableStatement | ForStatement | ForOfStatement | ForInStatement;
-        declarations: NodeArray<VariableDeclaration>;
-    }
-    interface ParameterDeclaration extends NamedDeclaration, JSDocContainer {
-        kind: SyntaxKind.Parameter;
-        parent: SignatureDeclaration;
-        dotDotDotToken?: DotDotDotToken;
-        name: BindingName;
-        questionToken?: QuestionToken;
-        type?: TypeNode;
-        initializer?: Expression;
-    }
-    interface BindingElement extends NamedDeclaration {
-        kind: SyntaxKind.BindingElement;
-        parent: BindingPattern;
-        propertyName?: PropertyName;
-        dotDotDotToken?: DotDotDotToken;
-        name: BindingName;
-        initializer?: Expression;
-    }
-    interface PropertySignature extends TypeElement, JSDocContainer {
-        kind: SyntaxKind.PropertySignature;
-        name: PropertyName;
-        questionToken?: QuestionToken;
-        type?: TypeNode;
-        initializer?: Expression;
-    }
-    interface PropertyDeclaration extends ClassElement, JSDocContainer {
-        kind: SyntaxKind.PropertyDeclaration;
-        parent: ClassLikeDeclaration;
-        name: PropertyName;
-        questionToken?: QuestionToken;
-        exclamationToken?: ExclamationToken;
-        type?: TypeNode;
-        initializer?: Expression;
-    }
-    interface ObjectLiteralElement extends NamedDeclaration {
-        _objectLiteralBrandBrand: any;
-        name?: PropertyName;
-    }
-    type ObjectLiteralElementLike = PropertyAssignment | ShorthandPropertyAssignment | SpreadAssignment | MethodDeclaration | AccessorDeclaration;
-    interface PropertyAssignment extends ObjectLiteralElement, JSDocContainer {
-        parent: ObjectLiteralExpression;
-        kind: SyntaxKind.PropertyAssignment;
-        name: PropertyName;
-        questionToken?: QuestionToken;
-        initializer: Expression;
-    }
-    interface ShorthandPropertyAssignment extends ObjectLiteralElement, JSDocContainer {
-        parent: ObjectLiteralExpression;
-        kind: SyntaxKind.ShorthandPropertyAssignment;
-        name: Identifier;
-        questionToken?: QuestionToken;
-        equalsToken?: Token<SyntaxKind.EqualsToken>;
-        objectAssignmentInitializer?: Expression;
-    }
-    interface SpreadAssignment extends ObjectLiteralElement, JSDocContainer {
-        parent: ObjectLiteralExpression;
-        kind: SyntaxKind.SpreadAssignment;
-        expression: Expression;
-    }
-    type VariableLikeDeclaration = VariableDeclaration | ParameterDeclaration | BindingElement | PropertyDeclaration | PropertyAssignment | PropertySignature | JsxAttribute | ShorthandPropertyAssignment | EnumMember | JSDocPropertyTag | JSDocParameterTag;
-    interface PropertyLikeDeclaration extends NamedDeclaration {
-        name: PropertyName;
-    }
-    interface ObjectBindingPattern extends Node {
-        kind: SyntaxKind.ObjectBindingPattern;
-        parent: VariableDeclaration | ParameterDeclaration | BindingElement;
-        elements: NodeArray<BindingElement>;
-    }
-    interface ArrayBindingPattern extends Node {
-        kind: SyntaxKind.ArrayBindingPattern;
-        parent: VariableDeclaration | ParameterDeclaration | BindingElement;
-        elements: NodeArray<ArrayBindingElement>;
-    }
-    type BindingPattern = ObjectBindingPattern | ArrayBindingPattern;
-    type ArrayBindingElement = BindingElement | OmittedExpression;
-    /**
-     * Several node kinds share function-like features such as a signature,
-     * a name, and a body. These nodes should extend FunctionLikeDeclarationBase.
-     * Examples:
-     * - FunctionDeclaration
-     * - MethodDeclaration
-     * - AccessorDeclaration
-     */
-    interface FunctionLikeDeclarationBase extends SignatureDeclarationBase {
-        _functionLikeDeclarationBrand: any;
-        asteriskToken?: AsteriskToken;
-        questionToken?: QuestionToken;
-        body?: Block | Expression;
-    }
-    type FunctionLikeDeclaration = FunctionDeclaration | MethodDeclaration | GetAccessorDeclaration | SetAccessorDeclaration | ConstructorDeclaration | FunctionExpression | ArrowFunction;
-    /** @deprecated Use SignatureDeclaration */
-    type FunctionLike = SignatureDeclaration;
-    interface FunctionDeclaration extends FunctionLikeDeclarationBase, DeclarationStatement {
-        kind: SyntaxKind.FunctionDeclaration;
-        name?: Identifier;
-        body?: FunctionBody;
-    }
-    interface MethodSignature extends SignatureDeclarationBase, TypeElement {
-        kind: SyntaxKind.MethodSignature;
-        parent: ObjectTypeDeclaration;
-        name: PropertyName;
-    }
-    interface MethodDeclaration extends FunctionLikeDeclarationBase, ClassElement, ObjectLiteralElement, JSDocContainer {
-        kind: SyntaxKind.MethodDeclaration;
-        parent: ClassLikeDeclaration | ObjectLiteralExpression;
-        name: PropertyName;
-        body?: FunctionBody;
-    }
-    interface ConstructorDeclaration extends FunctionLikeDeclarationBase, ClassElement, JSDocContainer {
-        kind: SyntaxKind.Constructor;
-        parent: ClassLikeDeclaration;
-        body?: FunctionBody;
-    }
-    /** For when we encounter a semicolon in a class declaration. ES6 allows these as class elements. */
-    interface SemicolonClassElement extends ClassElement {
-        kind: SyntaxKind.SemicolonClassElement;
-        parent: ClassLikeDeclaration;
-    }
-    interface GetAccessorDeclaration extends FunctionLikeDeclarationBase, ClassElement, ObjectLiteralElement, JSDocContainer {
-        kind: SyntaxKind.GetAccessor;
-        parent: ClassLikeDeclaration | ObjectLiteralExpression;
-        name: PropertyName;
-        body?: FunctionBody;
-    }
-    interface SetAccessorDeclaration extends FunctionLikeDeclarationBase, ClassElement, ObjectLiteralElement, JSDocContainer {
-        kind: SyntaxKind.SetAccessor;
-        parent: ClassLikeDeclaration | ObjectLiteralExpression;
-        name: PropertyName;
-        body?: FunctionBody;
-    }
-    type AccessorDeclaration = GetAccessorDeclaration | SetAccessorDeclaration;
-    interface IndexSignatureDeclaration extends SignatureDeclarationBase, ClassElement, TypeElement {
-        kind: SyntaxKind.IndexSignature;
-        parent: ObjectTypeDeclaration;
-    }
-    interface TypeNode extends Node {
-        _typeNodeBrand: any;
-    }
-    interface KeywordTypeNode extends TypeNode {
-        kind: SyntaxKind.AnyKeyword | SyntaxKind.UnknownKeyword | SyntaxKind.NumberKeyword | SyntaxKind.ObjectKeyword | SyntaxKind.BooleanKeyword | SyntaxKind.StringKeyword | SyntaxKind.SymbolKeyword | SyntaxKind.ThisKeyword | SyntaxKind.VoidKeyword | SyntaxKind.UndefinedKeyword | SyntaxKind.NullKeyword | SyntaxKind.NeverKeyword;
-    }
-    interface ImportTypeNode extends NodeWithTypeArguments {
-        kind: SyntaxKind.ImportType;
-        isTypeOf?: boolean;
-        argument: TypeNode;
-        qualifier?: EntityName;
-    }
-    interface ThisTypeNode extends TypeNode {
-        kind: SyntaxKind.ThisType;
-    }
-    type FunctionOrConstructorTypeNode = FunctionTypeNode | ConstructorTypeNode;
-    interface FunctionOrConstructorTypeNodeBase extends TypeNode, SignatureDeclarationBase {
-        kind: SyntaxKind.FunctionType | SyntaxKind.ConstructorType;
-        type: TypeNode;
-    }
-    interface FunctionTypeNode extends FunctionOrConstructorTypeNodeBase {
-        kind: SyntaxKind.FunctionType;
-    }
-    interface ConstructorTypeNode extends FunctionOrConstructorTypeNodeBase {
-        kind: SyntaxKind.ConstructorType;
-    }
-    interface NodeWithTypeArguments extends TypeNode {
-        typeArguments?: NodeArray<TypeNode>;
-    }
-    type TypeReferenceType = TypeReferenceNode | ExpressionWithTypeArguments;
-    interface TypeReferenceNode extends NodeWithTypeArguments {
-        kind: SyntaxKind.TypeReference;
-        typeName: EntityName;
-    }
-    interface TypePredicateNode extends TypeNode {
-        kind: SyntaxKind.TypePredicate;
-        parent: SignatureDeclaration;
-        parameterName: Identifier | ThisTypeNode;
-        type: TypeNode;
-    }
-    interface TypeQueryNode extends TypeNode {
-        kind: SyntaxKind.TypeQuery;
-        exprName: EntityName;
-    }
-    interface TypeLiteralNode extends TypeNode, Declaration {
-        kind: SyntaxKind.TypeLiteral;
-        members: NodeArray<TypeElement>;
-    }
-    interface ArrayTypeNode extends TypeNode {
-        kind: SyntaxKind.ArrayType;
-        elementType: TypeNode;
-    }
-    interface TupleTypeNode extends TypeNode {
-        kind: SyntaxKind.TupleType;
-        elementTypes: NodeArray<TypeNode>;
-    }
-    type UnionOrIntersectionTypeNode = UnionTypeNode | IntersectionTypeNode;
-    interface UnionTypeNode extends TypeNode {
-        kind: SyntaxKind.UnionType;
-        types: NodeArray<TypeNode>;
-    }
-    interface IntersectionTypeNode extends TypeNode {
-        kind: SyntaxKind.IntersectionType;
-        types: NodeArray<TypeNode>;
-    }
-    interface ConditionalTypeNode extends TypeNode {
-        kind: SyntaxKind.ConditionalType;
-        checkType: TypeNode;
-        extendsType: TypeNode;
-        trueType: TypeNode;
-        falseType: TypeNode;
-    }
-    interface InferTypeNode extends TypeNode {
-        kind: SyntaxKind.InferType;
-        typeParameter: TypeParameterDeclaration;
-    }
-    interface ParenthesizedTypeNode extends TypeNode {
-        kind: SyntaxKind.ParenthesizedType;
-        type: TypeNode;
-    }
-    interface TypeOperatorNode extends TypeNode {
-        kind: SyntaxKind.TypeOperator;
-        operator: SyntaxKind.KeyOfKeyword | SyntaxKind.UniqueKeyword;
-        type: TypeNode;
-    }
-    interface IndexedAccessTypeNode extends TypeNode {
-        kind: SyntaxKind.IndexedAccessType;
-        objectType: TypeNode;
-        indexType: TypeNode;
-    }
-    interface MappedTypeNode extends TypeNode, Declaration {
-        kind: SyntaxKind.MappedType;
-        readonlyToken?: ReadonlyToken | PlusToken | MinusToken;
-        typeParameter: TypeParameterDeclaration;
-        questionToken?: QuestionToken | PlusToken | MinusToken;
-        type?: TypeNode;
-    }
-    interface LiteralTypeNode extends TypeNode {
-        kind: SyntaxKind.LiteralType;
-        literal: BooleanLiteral | LiteralExpression | PrefixUnaryExpression;
-    }
-    interface StringLiteral extends LiteralExpression {
-        kind: SyntaxKind.StringLiteral;
-    }
-    type StringLiteralLike = StringLiteral | NoSubstitutionTemplateLiteral;
-    interface Expression extends Node {
-        _expressionBrand: any;
-    }
-    interface OmittedExpression extends Expression {
-        kind: SyntaxKind.OmittedExpression;
-    }
-    interface PartiallyEmittedExpression extends LeftHandSideExpression {
-        kind: SyntaxKind.PartiallyEmittedExpression;
-        expression: Expression;
-    }
-    interface UnaryExpression extends Expression {
-        _unaryExpressionBrand: any;
-    }
-    /** Deprecated, please use UpdateExpression */
-    type IncrementExpression = UpdateExpression;
-    interface UpdateExpression extends UnaryExpression {
-        _updateExpressionBrand: any;
-    }
-    type PrefixUnaryOperator = SyntaxKind.PlusPlusToken | SyntaxKind.MinusMinusToken | SyntaxKind.PlusToken | SyntaxKind.MinusToken | SyntaxKind.TildeToken | SyntaxKind.ExclamationToken;
-    interface PrefixUnaryExpression extends UpdateExpression {
-        kind: SyntaxKind.PrefixUnaryExpression;
-        operator: PrefixUnaryOperator;
-        operand: UnaryExpression;
-    }
-    type PostfixUnaryOperator = SyntaxKind.PlusPlusToken | SyntaxKind.MinusMinusToken;
-    interface PostfixUnaryExpression extends UpdateExpression {
-        kind: SyntaxKind.PostfixUnaryExpression;
-        operand: LeftHandSideExpression;
-        operator: PostfixUnaryOperator;
-    }
-    interface LeftHandSideExpression extends UpdateExpression {
-        _leftHandSideExpressionBrand: any;
-    }
-    interface MemberExpression extends LeftHandSideExpression {
-        _memberExpressionBrand: any;
-    }
-    interface PrimaryExpression extends MemberExpression {
-        _primaryExpressionBrand: any;
-    }
-    interface NullLiteral extends PrimaryExpression, TypeNode {
-        kind: SyntaxKind.NullKeyword;
-    }
-    interface BooleanLiteral extends PrimaryExpression, TypeNode {
-        kind: SyntaxKind.TrueKeyword | SyntaxKind.FalseKeyword;
-    }
-    interface ThisExpression extends PrimaryExpression, KeywordTypeNode {
-        kind: SyntaxKind.ThisKeyword;
-    }
-    interface SuperExpression extends PrimaryExpression {
-        kind: SyntaxKind.SuperKeyword;
-    }
-    interface ImportExpression extends PrimaryExpression {
-        kind: SyntaxKind.ImportKeyword;
-    }
-    interface DeleteExpression extends UnaryExpression {
-        kind: SyntaxKind.DeleteExpression;
-        expression: UnaryExpression;
-    }
-    interface TypeOfExpression extends UnaryExpression {
-        kind: SyntaxKind.TypeOfExpression;
-        expression: UnaryExpression;
-    }
-    interface VoidExpression extends UnaryExpression {
-        kind: SyntaxKind.VoidExpression;
-        expression: UnaryExpression;
-    }
-    interface AwaitExpression extends UnaryExpression {
-        kind: SyntaxKind.AwaitExpression;
-        expression: UnaryExpression;
-    }
-    interface YieldExpression extends Expression {
-        kind: SyntaxKind.YieldExpression;
-        asteriskToken?: AsteriskToken;
-        expression?: Expression;
-    }
-    type ExponentiationOperator = SyntaxKind.AsteriskAsteriskToken;
-    type MultiplicativeOperator = SyntaxKind.AsteriskToken | SyntaxKind.SlashToken | SyntaxKind.PercentToken;
-    type MultiplicativeOperatorOrHigher = ExponentiationOperator | MultiplicativeOperator;
-    type AdditiveOperator = SyntaxKind.PlusToken | SyntaxKind.MinusToken;
-    type AdditiveOperatorOrHigher = MultiplicativeOperatorOrHigher | AdditiveOperator;
-    type ShiftOperator = SyntaxKind.LessThanLessThanToken | SyntaxKind.GreaterThanGreaterThanToken | SyntaxKind.GreaterThanGreaterThanGreaterThanToken;
-    type ShiftOperatorOrHigher = AdditiveOperatorOrHigher | ShiftOperator;
-    type RelationalOperator = SyntaxKind.LessThanToken | SyntaxKind.LessThanEqualsToken | SyntaxKind.GreaterThanToken | SyntaxKind.GreaterThanEqualsToken | SyntaxKind.InstanceOfKeyword | SyntaxKind.InKeyword;
-    type RelationalOperatorOrHigher = ShiftOperatorOrHigher | RelationalOperator;
-    type EqualityOperator = SyntaxKind.EqualsEqualsToken | SyntaxKind.EqualsEqualsEqualsToken | SyntaxKind.ExclamationEqualsEqualsToken | SyntaxKind.ExclamationEqualsToken;
-    type EqualityOperatorOrHigher = RelationalOperatorOrHigher | EqualityOperator;
-    type BitwiseOperator = SyntaxKind.AmpersandToken | SyntaxKind.BarToken | SyntaxKind.CaretToken;
-    type BitwiseOperatorOrHigher = EqualityOperatorOrHigher | BitwiseOperator;
-    type LogicalOperator = SyntaxKind.AmpersandAmpersandToken | SyntaxKind.BarBarToken;
-    type LogicalOperatorOrHigher = BitwiseOperatorOrHigher | LogicalOperator;
-    type CompoundAssignmentOperator = SyntaxKind.PlusEqualsToken | SyntaxKind.MinusEqualsToken | SyntaxKind.AsteriskAsteriskEqualsToken | SyntaxKind.AsteriskEqualsToken | SyntaxKind.SlashEqualsToken | SyntaxKind.PercentEqualsToken | SyntaxKind.AmpersandEqualsToken | SyntaxKind.BarEqualsToken | SyntaxKind.CaretEqualsToken | SyntaxKind.LessThanLessThanEqualsToken | SyntaxKind.GreaterThanGreaterThanGreaterThanEqualsToken | SyntaxKind.GreaterThanGreaterThanEqualsToken;
-    type AssignmentOperator = SyntaxKind.EqualsToken | CompoundAssignmentOperator;
-    type AssignmentOperatorOrHigher = LogicalOperatorOrHigher | AssignmentOperator;
-    type BinaryOperator = AssignmentOperatorOrHigher | SyntaxKind.CommaToken;
-    type BinaryOperatorToken = Token<BinaryOperator>;
-    interface BinaryExpression extends Expression, Declaration {
-        kind: SyntaxKind.BinaryExpression;
-        left: Expression;
-        operatorToken: BinaryOperatorToken;
-        right: Expression;
-    }
-    type AssignmentOperatorToken = Token<AssignmentOperator>;
-    interface AssignmentExpression<TOperator extends AssignmentOperatorToken> extends BinaryExpression {
-        left: LeftHandSideExpression;
-        operatorToken: TOperator;
-    }
-    interface ObjectDestructuringAssignment extends AssignmentExpression<EqualsToken> {
-        left: ObjectLiteralExpression;
-    }
-    interface ArrayDestructuringAssignment extends AssignmentExpression<EqualsToken> {
-        left: ArrayLiteralExpression;
-    }
-    type DestructuringAssignment = ObjectDestructuringAssignment | ArrayDestructuringAssignment;
-    type BindingOrAssignmentElement = VariableDeclaration | ParameterDeclaration | BindingElement | PropertyAssignment | ShorthandPropertyAssignment | SpreadAssignment | OmittedExpression | SpreadElement | ArrayLiteralExpression | ObjectLiteralExpression | AssignmentExpression<EqualsToken> | Identifier | PropertyAccessExpression | ElementAccessExpression;
-    type BindingOrAssignmentElementRestIndicator = DotDotDotToken | SpreadElement | SpreadAssignment;
-    type BindingOrAssignmentElementTarget = BindingOrAssignmentPattern | Identifier | PropertyAccessExpression | ElementAccessExpression | OmittedExpression;
-    type ObjectBindingOrAssignmentPattern = ObjectBindingPattern | ObjectLiteralExpression;
-    type ArrayBindingOrAssignmentPattern = ArrayBindingPattern | ArrayLiteralExpression;
-    type AssignmentPattern = ObjectLiteralExpression | ArrayLiteralExpression;
-    type BindingOrAssignmentPattern = ObjectBindingOrAssignmentPattern | ArrayBindingOrAssignmentPattern;
-    interface ConditionalExpression extends Expression {
-        kind: SyntaxKind.ConditionalExpression;
-        condition: Expression;
-        questionToken: QuestionToken;
-        whenTrue: Expression;
-        colonToken: ColonToken;
-        whenFalse: Expression;
-    }
-    type FunctionBody = Block;
-    type ConciseBody = FunctionBody | Expression;
-    interface FunctionExpression extends PrimaryExpression, FunctionLikeDeclarationBase, JSDocContainer {
-        kind: SyntaxKind.FunctionExpression;
-        name?: Identifier;
-        body: FunctionBody;
-    }
-    interface ArrowFunction extends Expression, FunctionLikeDeclarationBase, JSDocContainer {
-        kind: SyntaxKind.ArrowFunction;
-        equalsGreaterThanToken: EqualsGreaterThanToken;
-        body: ConciseBody;
-        name: never;
-    }
-    interface LiteralLikeNode extends Node {
-        text: string;
-        isUnterminated?: boolean;
-        hasExtendedUnicodeEscape?: boolean;
-    }
-    interface LiteralExpression extends LiteralLikeNode, PrimaryExpression {
-        _literalExpressionBrand: any;
-    }
-    interface RegularExpressionLiteral extends LiteralExpression {
-        kind: SyntaxKind.RegularExpressionLiteral;
-    }
-    interface NoSubstitutionTemplateLiteral extends LiteralExpression {
-        kind: SyntaxKind.NoSubstitutionTemplateLiteral;
-    }
-    interface NumericLiteral extends LiteralExpression {
-        kind: SyntaxKind.NumericLiteral;
-    }
-    interface TemplateHead extends LiteralLikeNode {
-        kind: SyntaxKind.TemplateHead;
-        parent: TemplateExpression;
-    }
-    interface TemplateMiddle extends LiteralLikeNode {
-        kind: SyntaxKind.TemplateMiddle;
-        parent: TemplateSpan;
-    }
-    interface TemplateTail extends LiteralLikeNode {
-        kind: SyntaxKind.TemplateTail;
-        parent: TemplateSpan;
-    }
-    type TemplateLiteral = TemplateExpression | NoSubstitutionTemplateLiteral;
-    interface TemplateExpression extends PrimaryExpression {
-        kind: SyntaxKind.TemplateExpression;
-        head: TemplateHead;
-        templateSpans: NodeArray<TemplateSpan>;
-    }
-    interface TemplateSpan extends Node {
-        kind: SyntaxKind.TemplateSpan;
-        parent: TemplateExpression;
-        expression: Expression;
-        literal: TemplateMiddle | TemplateTail;
-    }
-    interface ParenthesizedExpression extends PrimaryExpression, JSDocContainer {
-        kind: SyntaxKind.ParenthesizedExpression;
-        expression: Expression;
-    }
-    interface ArrayLiteralExpression extends PrimaryExpression {
-        kind: SyntaxKind.ArrayLiteralExpression;
-        elements: NodeArray<Expression>;
-    }
-    interface SpreadElement extends Expression {
-        kind: SyntaxKind.SpreadElement;
-        parent: ArrayLiteralExpression | CallExpression | NewExpression;
-        expression: Expression;
-    }
-    /**
-     * This interface is a base interface for ObjectLiteralExpression and JSXAttributes to extend from. JSXAttributes is similar to
-     * ObjectLiteralExpression in that it contains array of properties; however, JSXAttributes' properties can only be
-     * JSXAttribute or JSXSpreadAttribute. ObjectLiteralExpression, on the other hand, can only have properties of type
-     * ObjectLiteralElement (e.g. PropertyAssignment, ShorthandPropertyAssignment etc.)
-     */
-    interface ObjectLiteralExpressionBase<T extends ObjectLiteralElement> extends PrimaryExpression, Declaration {
-        properties: NodeArray<T>;
-    }
-    interface ObjectLiteralExpression extends ObjectLiteralExpressionBase<ObjectLiteralElementLike> {
-        kind: SyntaxKind.ObjectLiteralExpression;
-    }
-    type EntityNameExpression = Identifier | PropertyAccessEntityNameExpression;
-    type EntityNameOrEntityNameExpression = EntityName | EntityNameExpression;
-    interface PropertyAccessExpression extends MemberExpression, NamedDeclaration {
-        kind: SyntaxKind.PropertyAccessExpression;
-        expression: LeftHandSideExpression;
-        name: Identifier;
-    }
-    interface SuperPropertyAccessExpression extends PropertyAccessExpression {
-        expression: SuperExpression;
-    }
-    /** Brand for a PropertyAccessExpression which, like a QualifiedName, consists of a sequence of identifiers separated by dots. */
-    interface PropertyAccessEntityNameExpression extends PropertyAccessExpression {
-        _propertyAccessExpressionLikeQualifiedNameBrand?: any;
-        expression: EntityNameExpression;
-    }
-    interface ElementAccessExpression extends MemberExpression {
-        kind: SyntaxKind.ElementAccessExpression;
-        expression: LeftHandSideExpression;
-        argumentExpression: Expression;
-    }
-    interface SuperElementAccessExpression extends ElementAccessExpression {
-        expression: SuperExpression;
-    }
-    type SuperProperty = SuperPropertyAccessExpression | SuperElementAccessExpression;
-    interface CallExpression extends LeftHandSideExpression, Declaration {
-        kind: SyntaxKind.CallExpression;
-        expression: LeftHandSideExpression;
-        typeArguments?: NodeArray<TypeNode>;
-        arguments: NodeArray<Expression>;
-    }
-    interface SuperCall extends CallExpression {
-        expression: SuperExpression;
-    }
-    interface ImportCall extends CallExpression {
-        expression: ImportExpression;
-    }
-    interface ExpressionWithTypeArguments extends NodeWithTypeArguments {
-        kind: SyntaxKind.ExpressionWithTypeArguments;
-        parent: HeritageClause;
-        expression: LeftHandSideExpression;
-    }
-    interface NewExpression extends PrimaryExpression, Declaration {
-        kind: SyntaxKind.NewExpression;
-        expression: LeftHandSideExpression;
-        typeArguments?: NodeArray<TypeNode>;
-        arguments?: NodeArray<Expression>;
-    }
-    interface TaggedTemplateExpression extends MemberExpression {
-        kind: SyntaxKind.TaggedTemplateExpression;
-        tag: LeftHandSideExpression;
-        typeArguments?: NodeArray<TypeNode>;
-        template: TemplateLiteral;
-    }
-    type CallLikeExpression = CallExpression | NewExpression | TaggedTemplateExpression | Decorator | JsxOpeningLikeElement;
-    interface AsExpression extends Expression {
-        kind: SyntaxKind.AsExpression;
-        expression: Expression;
-        type: TypeNode;
-    }
-    interface TypeAssertion extends UnaryExpression {
-        kind: SyntaxKind.TypeAssertionExpression;
-        type: TypeNode;
-        expression: UnaryExpression;
-    }
-    type AssertionExpression = TypeAssertion | AsExpression;
-    interface NonNullExpression extends LeftHandSideExpression {
-        kind: SyntaxKind.NonNullExpression;
-        expression: Expression;
-    }
-    interface MetaProperty extends PrimaryExpression {
-        kind: SyntaxKind.MetaProperty;
-        keywordToken: SyntaxKind.NewKeyword | SyntaxKind.ImportKeyword;
-        name: Identifier;
-    }
-    interface JsxElement extends PrimaryExpression {
-        kind: SyntaxKind.JsxElement;
-        openingElement: JsxOpeningElement;
-        children: NodeArray<JsxChild>;
-        closingElement: JsxClosingElement;
-    }
-    type JsxOpeningLikeElement = JsxSelfClosingElement | JsxOpeningElement;
-    type JsxAttributeLike = JsxAttribute | JsxSpreadAttribute;
-    type JsxTagNameExpression = PrimaryExpression | PropertyAccessExpression;
-    interface JsxAttributes extends ObjectLiteralExpressionBase<JsxAttributeLike> {
-        parent: JsxOpeningLikeElement;
-    }
-    interface JsxOpeningElement extends Expression {
-        kind: SyntaxKind.JsxOpeningElement;
-        parent: JsxElement;
-        tagName: JsxTagNameExpression;
-        typeArguments?: NodeArray<TypeNode>;
-        attributes: JsxAttributes;
-    }
-    interface JsxSelfClosingElement extends PrimaryExpression {
-        kind: SyntaxKind.JsxSelfClosingElement;
-        tagName: JsxTagNameExpression;
-        typeArguments?: NodeArray<TypeNode>;
-        attributes: JsxAttributes;
-    }
-    interface JsxFragment extends PrimaryExpression {
-        kind: SyntaxKind.JsxFragment;
-        openingFragment: JsxOpeningFragment;
-        children: NodeArray<JsxChild>;
-        closingFragment: JsxClosingFragment;
-    }
-    interface JsxOpeningFragment extends Expression {
-        kind: SyntaxKind.JsxOpeningFragment;
-        parent: JsxFragment;
-    }
-    interface JsxClosingFragment extends Expression {
-        kind: SyntaxKind.JsxClosingFragment;
-        parent: JsxFragment;
-    }
-    interface JsxAttribute extends ObjectLiteralElement {
-        kind: SyntaxKind.JsxAttribute;
-        parent: JsxAttributes;
-        name: Identifier;
-        initializer?: StringLiteral | JsxExpression;
-    }
-    interface JsxSpreadAttribute extends ObjectLiteralElement {
-        kind: SyntaxKind.JsxSpreadAttribute;
-        parent: JsxAttributes;
-        expression: Expression;
-    }
-    interface JsxClosingElement extends Node {
-        kind: SyntaxKind.JsxClosingElement;
-        parent: JsxElement;
-        tagName: JsxTagNameExpression;
-    }
-    interface JsxExpression extends Expression {
-        kind: SyntaxKind.JsxExpression;
-        parent: JsxElement | JsxAttributeLike;
-        dotDotDotToken?: Token<SyntaxKind.DotDotDotToken>;
-        expression?: Expression;
-    }
-    interface JsxText extends Node {
-        kind: SyntaxKind.JsxText;
-        containsOnlyWhiteSpaces: boolean;
-        parent: JsxElement;
-    }
-    type JsxChild = JsxText | JsxExpression | JsxElement | JsxSelfClosingElement | JsxFragment;
-    interface Statement extends Node {
-        _statementBrand: any;
-    }
-    interface NotEmittedStatement extends Statement {
-        kind: SyntaxKind.NotEmittedStatement;
-    }
-    /**
-     * A list of comma-separated expressions. This node is only created by transformations.
-     */
-    interface CommaListExpression extends Expression {
-        kind: SyntaxKind.CommaListExpression;
-        elements: NodeArray<Expression>;
-    }
-    interface EmptyStatement extends Statement {
-        kind: SyntaxKind.EmptyStatement;
-    }
-    interface DebuggerStatement extends Statement {
-        kind: SyntaxKind.DebuggerStatement;
-    }
-    interface MissingDeclaration extends DeclarationStatement {
-        kind: SyntaxKind.MissingDeclaration;
-        name?: Identifier;
-    }
-    type BlockLike = SourceFile | Block | ModuleBlock | CaseOrDefaultClause;
-    interface Block extends Statement {
-        kind: SyntaxKind.Block;
-        statements: NodeArray<Statement>;
-    }
-    interface VariableStatement extends Statement, JSDocContainer {
-        kind: SyntaxKind.VariableStatement;
-        declarationList: VariableDeclarationList;
-    }
-    interface ExpressionStatement extends Statement, JSDocContainer {
-        kind: SyntaxKind.ExpressionStatement;
-        expression: Expression;
-    }
-    interface IfStatement extends Statement {
-        kind: SyntaxKind.IfStatement;
-        expression: Expression;
-        thenStatement: Statement;
-        elseStatement?: Statement;
-    }
-    interface IterationStatement extends Statement {
-        statement: Statement;
-    }
-    interface DoStatement extends IterationStatement {
-        kind: SyntaxKind.DoStatement;
-        expression: Expression;
-    }
-    interface WhileStatement extends IterationStatement {
-        kind: SyntaxKind.WhileStatement;
-        expression: Expression;
-    }
-    type ForInitializer = VariableDeclarationList | Expression;
-    interface ForStatement extends IterationStatement {
-        kind: SyntaxKind.ForStatement;
-        initializer?: ForInitializer;
-        condition?: Expression;
-        incrementor?: Expression;
-    }
-    type ForInOrOfStatement = ForInStatement | ForOfStatement;
-    interface ForInStatement extends IterationStatement {
-        kind: SyntaxKind.ForInStatement;
-        initializer: ForInitializer;
-        expression: Expression;
-    }
-    interface ForOfStatement extends IterationStatement {
-        kind: SyntaxKind.ForOfStatement;
-        awaitModifier?: AwaitKeywordToken;
-        initializer: ForInitializer;
-        expression: Expression;
-    }
-    interface BreakStatement extends Statement {
-        kind: SyntaxKind.BreakStatement;
-        label?: Identifier;
-    }
-    interface ContinueStatement extends Statement {
-        kind: SyntaxKind.ContinueStatement;
-        label?: Identifier;
-    }
-    type BreakOrContinueStatement = BreakStatement | ContinueStatement;
-    interface ReturnStatement extends Statement {
-        kind: SyntaxKind.ReturnStatement;
-        expression?: Expression;
-    }
-    interface WithStatement extends Statement {
-        kind: SyntaxKind.WithStatement;
-        expression: Expression;
-        statement: Statement;
-    }
-    interface SwitchStatement extends Statement {
-        kind: SyntaxKind.SwitchStatement;
-        expression: Expression;
-        caseBlock: CaseBlock;
-        possiblyExhaustive?: boolean;
-    }
-    interface CaseBlock extends Node {
-        kind: SyntaxKind.CaseBlock;
-        parent: SwitchStatement;
-        clauses: NodeArray<CaseOrDefaultClause>;
-    }
-    interface CaseClause extends Node {
-        kind: SyntaxKind.CaseClause;
-        parent: CaseBlock;
-        expression: Expression;
-        statements: NodeArray<Statement>;
-    }
-    interface DefaultClause extends Node {
-        kind: SyntaxKind.DefaultClause;
-        parent: CaseBlock;
-        statements: NodeArray<Statement>;
-    }
-    type CaseOrDefaultClause = CaseClause | DefaultClause;
-    interface LabeledStatement extends Statement, JSDocContainer {
-        kind: SyntaxKind.LabeledStatement;
-        label: Identifier;
-        statement: Statement;
-    }
-    interface ThrowStatement extends Statement {
-        kind: SyntaxKind.ThrowStatement;
-        expression?: Expression;
-    }
-    interface TryStatement extends Statement {
-        kind: SyntaxKind.TryStatement;
-        tryBlock: Block;
-        catchClause?: CatchClause;
-        finallyBlock?: Block;
-    }
-    interface CatchClause extends Node {
-        kind: SyntaxKind.CatchClause;
-        parent: TryStatement;
-        variableDeclaration?: VariableDeclaration;
-        block: Block;
-    }
-    type ObjectTypeDeclaration = ClassLikeDeclaration | InterfaceDeclaration | TypeLiteralNode;
-    type DeclarationWithTypeParameters = SignatureDeclaration | ClassLikeDeclaration | InterfaceDeclaration | TypeAliasDeclaration | JSDocTemplateTag | JSDocTypedefTag | JSDocCallbackTag | JSDocSignature;
-    interface ClassLikeDeclarationBase extends NamedDeclaration, JSDocContainer {
-        kind: SyntaxKind.ClassDeclaration | SyntaxKind.ClassExpression;
-        name?: Identifier;
-        typeParameters?: NodeArray<TypeParameterDeclaration>;
-        heritageClauses?: NodeArray<HeritageClause>;
-        members: NodeArray<ClassElement>;
-    }
-    interface ClassDeclaration extends ClassLikeDeclarationBase, DeclarationStatement {
-        kind: SyntaxKind.ClassDeclaration;
-        /** May be undefined in `export default class { ... }`. */
-        name?: Identifier;
-    }
-    interface ClassExpression extends ClassLikeDeclarationBase, PrimaryExpression {
-        kind: SyntaxKind.ClassExpression;
-    }
-    type ClassLikeDeclaration = ClassDeclaration | ClassExpression;
-    interface ClassElement extends NamedDeclaration {
-        _classElementBrand: any;
-        name?: PropertyName;
-    }
-    interface TypeElement extends NamedDeclaration {
-        _typeElementBrand: any;
-        name?: PropertyName;
-        questionToken?: QuestionToken;
-    }
-    interface InterfaceDeclaration extends DeclarationStatement, JSDocContainer {
-        kind: SyntaxKind.InterfaceDeclaration;
-        name: Identifier;
-        typeParameters?: NodeArray<TypeParameterDeclaration>;
-        heritageClauses?: NodeArray<HeritageClause>;
-        members: NodeArray<TypeElement>;
-    }
-    interface HeritageClause extends Node {
-        kind: SyntaxKind.HeritageClause;
-        parent: InterfaceDeclaration | ClassLikeDeclaration;
-        token: SyntaxKind.ExtendsKeyword | SyntaxKind.ImplementsKeyword;
-        types: NodeArray<ExpressionWithTypeArguments>;
-    }
-    interface TypeAliasDeclaration extends DeclarationStatement, JSDocContainer {
-        kind: SyntaxKind.TypeAliasDeclaration;
-        name: Identifier;
-        typeParameters?: NodeArray<TypeParameterDeclaration>;
-        type: TypeNode;
-    }
-    interface EnumMember extends NamedDeclaration, JSDocContainer {
-        kind: SyntaxKind.EnumMember;
-        parent: EnumDeclaration;
-        name: PropertyName;
-        initializer?: Expression;
-    }
-    interface EnumDeclaration extends DeclarationStatement, JSDocContainer {
-        kind: SyntaxKind.EnumDeclaration;
-        name: Identifier;
-        members: NodeArray<EnumMember>;
-    }
-    type ModuleName = Identifier | StringLiteral;
-    type ModuleBody = NamespaceBody | JSDocNamespaceBody;
-    interface ModuleDeclaration extends DeclarationStatement, JSDocContainer {
-        kind: SyntaxKind.ModuleDeclaration;
-        parent: ModuleBody | SourceFile;
-        name: ModuleName;
-        body?: ModuleBody | JSDocNamespaceDeclaration;
-    }
-    type NamespaceBody = ModuleBlock | NamespaceDeclaration;
-    interface NamespaceDeclaration extends ModuleDeclaration {
-        name: Identifier;
-        body: NamespaceBody;
-    }
-    type JSDocNamespaceBody = Identifier | JSDocNamespaceDeclaration;
-    interface JSDocNamespaceDeclaration extends ModuleDeclaration {
-        name: Identifier;
-        body?: JSDocNamespaceBody;
-    }
-    interface ModuleBlock extends Node, Statement {
-        kind: SyntaxKind.ModuleBlock;
-        parent: ModuleDeclaration;
-        statements: NodeArray<Statement>;
-    }
-    type ModuleReference = EntityName | ExternalModuleReference;
-    /**
-     * One of:
-     * - import x = require("mod");
-     * - import x = M.x;
-     */
-    interface ImportEqualsDeclaration extends DeclarationStatement, JSDocContainer {
-        kind: SyntaxKind.ImportEqualsDeclaration;
-        parent: SourceFile | ModuleBlock;
-        name: Identifier;
-        moduleReference: ModuleReference;
-    }
-    interface ExternalModuleReference extends Node {
-        kind: SyntaxKind.ExternalModuleReference;
-        parent: ImportEqualsDeclaration;
-        expression: Expression;
-    }
-    interface ImportDeclaration extends Statement {
-        kind: SyntaxKind.ImportDeclaration;
-        parent: SourceFile | ModuleBlock;
-        importClause?: ImportClause;
-        /** If this is not a StringLiteral it will be a grammar error. */
-        moduleSpecifier: Expression;
-    }
-    type NamedImportBindings = NamespaceImport | NamedImports;
-    interface ImportClause extends NamedDeclaration {
-        kind: SyntaxKind.ImportClause;
-        parent: ImportDeclaration;
-        name?: Identifier;
-        namedBindings?: NamedImportBindings;
-    }
-    interface NamespaceImport extends NamedDeclaration {
-        kind: SyntaxKind.NamespaceImport;
-        parent: ImportClause;
-        name: Identifier;
-    }
-    interface NamespaceExportDeclaration extends DeclarationStatement {
-        kind: SyntaxKind.NamespaceExportDeclaration;
-        name: Identifier;
-    }
-    interface ExportDeclaration extends DeclarationStatement {
-        kind: SyntaxKind.ExportDeclaration;
-        parent: SourceFile | ModuleBlock;
-        /** Will not be assigned in the case of `export * from "foo";` */
-        exportClause?: NamedExports;
-        /** If this is not a StringLiteral it will be a grammar error. */
-        moduleSpecifier?: Expression;
-    }
-    interface NamedImports extends Node {
-        kind: SyntaxKind.NamedImports;
-        parent: ImportClause;
-        elements: NodeArray<ImportSpecifier>;
-    }
-    interface NamedExports extends Node {
-        kind: SyntaxKind.NamedExports;
-        parent: ExportDeclaration;
-        elements: NodeArray<ExportSpecifier>;
-    }
-    type NamedImportsOrExports = NamedImports | NamedExports;
-    interface ImportSpecifier extends NamedDeclaration {
-        kind: SyntaxKind.ImportSpecifier;
-        parent: NamedImports;
-        propertyName?: Identifier;
-        name: Identifier;
-    }
-    interface ExportSpecifier extends NamedDeclaration {
-        kind: SyntaxKind.ExportSpecifier;
-        parent: NamedExports;
-        propertyName?: Identifier;
-        name: Identifier;
-    }
-    type ImportOrExportSpecifier = ImportSpecifier | ExportSpecifier;
-    /**
-     * This is either an `export =` or an `export default` declaration.
-     * Unless `isExportEquals` is set, this node was parsed as an `export default`.
-     */
-    interface ExportAssignment extends DeclarationStatement {
-        kind: SyntaxKind.ExportAssignment;
-        parent: SourceFile;
-        isExportEquals?: boolean;
-        expression: Expression;
-    }
-    interface FileReference extends TextRange {
-        fileName: string;
-    }
-    interface CheckJsDirective extends TextRange {
-        enabled: boolean;
-    }
-    type CommentKind = SyntaxKind.SingleLineCommentTrivia | SyntaxKind.MultiLineCommentTrivia;
-    interface CommentRange extends TextRange {
-        hasTrailingNewLine?: boolean;
-        kind: CommentKind;
-    }
-    interface SynthesizedComment extends CommentRange {
-        text: string;
-        pos: -1;
-        end: -1;
-    }
-    interface JSDocTypeExpression extends TypeNode {
-        kind: SyntaxKind.JSDocTypeExpression;
-        type: TypeNode;
-    }
-    interface JSDocType extends TypeNode {
-        _jsDocTypeBrand: any;
-    }
-    interface JSDocAllType extends JSDocType {
-        kind: SyntaxKind.JSDocAllType;
-    }
-    interface JSDocUnknownType extends JSDocType {
-        kind: SyntaxKind.JSDocUnknownType;
-    }
-    interface JSDocNonNullableType extends JSDocType {
-        kind: SyntaxKind.JSDocNonNullableType;
-        type: TypeNode;
-    }
-    interface JSDocNullableType extends JSDocType {
-        kind: SyntaxKind.JSDocNullableType;
-        type: TypeNode;
-    }
-    interface JSDocOptionalType extends JSDocType {
-        kind: SyntaxKind.JSDocOptionalType;
-        type: TypeNode;
-    }
-    interface JSDocFunctionType extends JSDocType, SignatureDeclarationBase {
-        kind: SyntaxKind.JSDocFunctionType;
-    }
-    interface JSDocVariadicType extends JSDocType {
-        kind: SyntaxKind.JSDocVariadicType;
-        type: TypeNode;
-    }
-    type JSDocTypeReferencingNode = JSDocVariadicType | JSDocOptionalType | JSDocNullableType | JSDocNonNullableType;
-    interface JSDoc extends Node {
-        kind: SyntaxKind.JSDocComment;
-        parent: HasJSDoc;
-        tags?: NodeArray<JSDocTag>;
-        comment?: string;
-    }
-    interface JSDocTag extends Node {
-        parent: JSDoc | JSDocTypeLiteral;
-        atToken: AtToken;
-        tagName: Identifier;
-        comment?: string;
-    }
-    interface JSDocUnknownTag extends JSDocTag {
-        kind: SyntaxKind.JSDocTag;
-    }
-    /**
-     * Note that `@extends` is a synonym of `@augments`.
-     * Both tags are represented by this interface.
-     */
-    interface JSDocAugmentsTag extends JSDocTag {
-        kind: SyntaxKind.JSDocAugmentsTag;
-        class: ExpressionWithTypeArguments & {
-            expression: Identifier | PropertyAccessEntityNameExpression;
-        };
-    }
-    interface JSDocClassTag extends JSDocTag {
-        kind: SyntaxKind.JSDocClassTag;
-    }
-    interface JSDocTemplateTag extends JSDocTag {
-        kind: SyntaxKind.JSDocTemplateTag;
-        typeParameters: NodeArray<TypeParameterDeclaration>;
-    }
-    interface JSDocReturnTag extends JSDocTag {
-        kind: SyntaxKind.JSDocReturnTag;
-        typeExpression?: JSDocTypeExpression;
-    }
-    interface JSDocTypeTag extends JSDocTag {
-        kind: SyntaxKind.JSDocTypeTag;
-        typeExpression?: JSDocTypeExpression;
-    }
-    interface JSDocTypedefTag extends JSDocTag, NamedDeclaration {
-        parent: JSDoc;
-        kind: SyntaxKind.JSDocTypedefTag;
-        fullName?: JSDocNamespaceDeclaration | Identifier;
-        name?: Identifier;
-        typeExpression?: JSDocTypeExpression | JSDocTypeLiteral;
-    }
-    interface JSDocCallbackTag extends JSDocTag, NamedDeclaration {
-        parent: JSDoc;
-        kind: SyntaxKind.JSDocCallbackTag;
-        fullName?: JSDocNamespaceDeclaration | Identifier;
-        name?: Identifier;
-        typeExpression: JSDocSignature;
-    }
-    interface JSDocSignature extends JSDocType, Declaration {
-        kind: SyntaxKind.JSDocSignature;
-        typeParameters?: ReadonlyArray<JSDocTemplateTag>;
-        parameters: ReadonlyArray<JSDocParameterTag>;
-        type: JSDocReturnTag | undefined;
-    }
-    interface JSDocPropertyLikeTag extends JSDocTag, Declaration {
-        parent: JSDoc;
-        name: EntityName;
-        typeExpression?: JSDocTypeExpression;
-        /** Whether the property name came before the type -- non-standard for JSDoc, but Typescript-like */
-        isNameFirst: boolean;
-        isBracketed: boolean;
-    }
-    interface JSDocPropertyTag extends JSDocPropertyLikeTag {
-        kind: SyntaxKind.JSDocPropertyTag;
-    }
-    interface JSDocParameterTag extends JSDocPropertyLikeTag {
-        kind: SyntaxKind.JSDocParameterTag;
-    }
-    interface JSDocTypeLiteral extends JSDocType {
-        kind: SyntaxKind.JSDocTypeLiteral;
-        jsDocPropertyTags?: ReadonlyArray<JSDocPropertyLikeTag>;
-        /** If true, then this type literal represents an *array* of its type. */
-        isArrayType?: boolean;
-    }
-    enum FlowFlags {
-        Unreachable = 1,
-        Start = 2,
-        BranchLabel = 4,
-        LoopLabel = 8,
-        Assignment = 16,
-        TrueCondition = 32,
-        FalseCondition = 64,
-        SwitchClause = 128,
-        ArrayMutation = 256,
-        Referenced = 512,
-        Shared = 1024,
-        PreFinally = 2048,
-        AfterFinally = 4096,
-        Label = 12,
-        Condition = 96
-    }
-    interface FlowLock {
-        locked?: boolean;
-    }
-    interface AfterFinallyFlow extends FlowNodeBase, FlowLock {
-        antecedent: FlowNode;
-    }
-    interface PreFinallyFlow extends FlowNodeBase {
-        antecedent: FlowNode;
-        lock: FlowLock;
-    }
-    type FlowNode = AfterFinallyFlow | PreFinallyFlow | FlowStart | FlowLabel | FlowAssignment | FlowCondition | FlowSwitchClause | FlowArrayMutation;
-    interface FlowNodeBase {
-        flags: FlowFlags;
-        id?: number;
-    }
-    interface FlowStart extends FlowNodeBase {
-        container?: FunctionExpression | ArrowFunction | MethodDeclaration;
-    }
-    interface FlowLabel extends FlowNodeBase {
-        antecedents: FlowNode[] | undefined;
-    }
-    interface FlowAssignment extends FlowNodeBase {
-        node: Expression | VariableDeclaration | BindingElement;
-        antecedent: FlowNode;
-    }
-    interface FlowCondition extends FlowNodeBase {
-        expression: Expression;
-        antecedent: FlowNode;
-    }
-    interface FlowSwitchClause extends FlowNodeBase {
-        switchStatement: SwitchStatement;
-        clauseStart: number;
-        clauseEnd: number;
-        antecedent: FlowNode;
-    }
-    interface FlowArrayMutation extends FlowNodeBase {
-        node: CallExpression | BinaryExpression;
-        antecedent: FlowNode;
-    }
-    type FlowType = Type | IncompleteType;
-    interface IncompleteType {
-        flags: TypeFlags;
-        type: Type;
-    }
-    interface AmdDependency {
-        path: string;
-        name?: string;
-    }
-    interface SourceFile extends Declaration {
-        kind: SyntaxKind.SourceFile;
-        statements: NodeArray<Statement>;
-        endOfFileToken: Token<SyntaxKind.EndOfFileToken>;
-        fileName: string;
-        text: string;
-        amdDependencies: ReadonlyArray<AmdDependency>;
-        moduleName?: string;
-        referencedFiles: ReadonlyArray<FileReference>;
-        typeReferenceDirectives: ReadonlyArray<FileReference>;
-        libReferenceDirectives: ReadonlyArray<FileReference>;
-        languageVariant: LanguageVariant;
-        isDeclarationFile: boolean;
-        /**
-         * lib.d.ts should have a reference comment like
-         *
-         *  /// <reference no-default-lib="true"/>
-         *
-         * If any other file has this comment, it signals not to include lib.d.ts
-         * because this containing file is intended to act as a default library.
-         */
-        hasNoDefaultLib: boolean;
-        languageVersion: ScriptTarget;
-    }
-    interface Bundle extends Node {
-        kind: SyntaxKind.Bundle;
-        prepends: ReadonlyArray<InputFiles | UnparsedSource>;
-        sourceFiles: ReadonlyArray<SourceFile>;
-    }
-    interface InputFiles extends Node {
-        kind: SyntaxKind.InputFiles;
-        javascriptText: string;
-        javascriptMapText?: string;
-        declarationText: string;
-        declarationMapText?: string;
-    }
-    interface UnparsedSource extends Node {
-        kind: SyntaxKind.UnparsedSource;
-        text: string;
-        sourceMapText?: string;
-    }
-    interface JsonSourceFile extends SourceFile {
-        statements: NodeArray<JsonObjectExpressionStatement>;
-    }
-    interface TsConfigSourceFile extends JsonSourceFile {
-        extendedSourceFiles?: string[];
-    }
-    interface JsonMinusNumericLiteral extends PrefixUnaryExpression {
-        kind: SyntaxKind.PrefixUnaryExpression;
-        operator: SyntaxKind.MinusToken;
-        operand: NumericLiteral;
-    }
-    interface JsonObjectExpressionStatement extends ExpressionStatement {
-        expression: ObjectLiteralExpression | ArrayLiteralExpression | JsonMinusNumericLiteral | NumericLiteral | StringLiteral | BooleanLiteral | NullLiteral;
-    }
-    interface ScriptReferenceHost {
-        getCompilerOptions(): CompilerOptions;
-        getSourceFile(fileName: string): SourceFile | undefined;
-        getSourceFileByPath(path: Path): SourceFile | undefined;
-        getCurrentDirectory(): string;
-    }
-    interface ParseConfigHost {
-        useCaseSensitiveFileNames: boolean;
-        readDirectory(rootDir: string, extensions: ReadonlyArray<string>, excludes: ReadonlyArray<string> | undefined, includes: ReadonlyArray<string>, depth?: number): string[];
-        /**
-         * Gets a value indicating whether the specified path exists and is a file.
-         * @param path The path to test.
-         */
-        fileExists(path: string): boolean;
-        readFile(path: string): string | undefined;
-    }
-    type WriteFileCallback = (fileName: string, data: string, writeByteOrderMark: boolean, onError: ((message: string) => void) | undefined, sourceFiles?: ReadonlyArray<SourceFile>) => void;
-    class OperationCanceledException {
-    }
-    interface CancellationToken {
-        isCancellationRequested(): boolean;
-        /** @throws OperationCanceledException if isCancellationRequested is true */
-        throwIfCancellationRequested(): void;
-    }
-    interface Program extends ScriptReferenceHost {
-        /**
-         * Get a list of root file names that were passed to a 'createProgram'
-         */
-        getRootFileNames(): ReadonlyArray<string>;
-        /**
-         * Get a list of files in the program
-         */
-        getSourceFiles(): ReadonlyArray<SourceFile>;
-        /**
-         * Emits the JavaScript and declaration files.  If targetSourceFile is not specified, then
-         * the JavaScript and declaration files will be produced for all the files in this program.
-         * If targetSourceFile is specified, then only the JavaScript and declaration for that
-         * specific file will be generated.
-         *
-         * If writeFile is not specified then the writeFile callback from the compiler host will be
-         * used for writing the JavaScript and declaration files.  Otherwise, the writeFile parameter
-         * will be invoked when writing the JavaScript and declaration files.
-         */
-        emit(targetSourceFile?: SourceFile, writeFile?: WriteFileCallback, cancellationToken?: CancellationToken, emitOnlyDtsFiles?: boolean, customTransformers?: CustomTransformers): EmitResult;
-        getOptionsDiagnostics(cancellationToken?: CancellationToken): ReadonlyArray<Diagnostic>;
-        getGlobalDiagnostics(cancellationToken?: CancellationToken): ReadonlyArray<Diagnostic>;
-        getSyntacticDiagnostics(sourceFile?: SourceFile, cancellationToken?: CancellationToken): ReadonlyArray<DiagnosticWithLocation>;
-        /** The first time this is called, it will return global diagnostics (no location). */
-        getSemanticDiagnostics(sourceFile?: SourceFile, cancellationToken?: CancellationToken): ReadonlyArray<Diagnostic>;
-        getDeclarationDiagnostics(sourceFile?: SourceFile, cancellationToken?: CancellationToken): ReadonlyArray<DiagnosticWithLocation>;
-        getConfigFileParsingDiagnostics(): ReadonlyArray<Diagnostic>;
-        /**
-         * Gets a type checker that can be used to semantically analyze source files in the program.
-         */
-        getTypeChecker(): TypeChecker;
-        isSourceFileFromExternalLibrary(file: SourceFile): boolean;
-        getProjectReferences(): (ResolvedProjectReference | undefined)[] | undefined;
-    }
-    interface ResolvedProjectReference {
-        commandLine: ParsedCommandLine;
-        sourceFile: SourceFile;
-    }
-    interface CustomTransformers {
-        /** Custom transformers to evaluate before built-in .js transformations. */
-        before?: TransformerFactory<SourceFile>[];
-        /** Custom transformers to evaluate after built-in .js transformations. */
-        after?: TransformerFactory<SourceFile>[];
-        /** Custom transformers to evaluate after built-in .d.ts transformations. */
-        afterDeclarations?: TransformerFactory<Bundle | SourceFile>[];
-    }
-    interface SourceMapSpan {
-        /** Line number in the .js file. */
-        emittedLine: number;
-        /** Column number in the .js file. */
-        emittedColumn: number;
-        /** Line number in the .ts file. */
-        sourceLine: number;
-        /** Column number in the .ts file. */
-        sourceColumn: number;
-        /** Optional name (index into names array) associated with this span. */
-        nameIndex?: number;
-        /** .ts file (index into sources array) associated with this span */
-        sourceIndex: number;
-    }
-    interface SourceMapData {
-        sourceMapFilePath: string;
-        jsSourceMappingURL: string;
-        sourceMapFile: string;
-        sourceMapSourceRoot: string;
-        sourceMapSources: string[];
-        sourceMapSourcesContent?: string[];
-        inputSourceFileNames: string[];
-        sourceMapNames?: string[];
-        sourceMapMappings: string;
-        sourceMapDecodedMappings: SourceMapSpan[];
-    }
-    /** Return code used by getEmitOutput function to indicate status of the function */
-    enum ExitStatus {
-        Success = 0,
-        DiagnosticsPresent_OutputsSkipped = 1,
-        DiagnosticsPresent_OutputsGenerated = 2
-    }
-    interface EmitResult {
-        emitSkipped: boolean;
-        /** Contains declaration emit diagnostics */
-        diagnostics: ReadonlyArray<Diagnostic>;
-        emittedFiles?: string[];
-    }
-    interface TypeChecker {
-        getTypeOfSymbolAtLocation(symbol: Symbol, node: Node): Type;
-        getDeclaredTypeOfSymbol(symbol: Symbol): Type;
-        getPropertiesOfType(type: Type): Symbol[];
-        getPropertyOfType(type: Type, propertyName: string): Symbol | undefined;
-        getIndexInfoOfType(type: Type, kind: IndexKind): IndexInfo | undefined;
-        getSignaturesOfType(type: Type, kind: SignatureKind): Signature[];
-        getIndexTypeOfType(type: Type, kind: IndexKind): Type | undefined;
-        getBaseTypes(type: InterfaceType): BaseType[];
-        getBaseTypeOfLiteralType(type: Type): Type;
-        getWidenedType(type: Type): Type;
-        getReturnTypeOfSignature(signature: Signature): Type;
-        getNullableType(type: Type, flags: TypeFlags): Type;
-        getNonNullableType(type: Type): Type;
-        /** Note that the resulting nodes cannot be checked. */
-        typeToTypeNode(type: Type, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): TypeNode | undefined;
-        /** Note that the resulting nodes cannot be checked. */
-        signatureToSignatureDeclaration(signature: Signature, kind: SyntaxKind, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): (SignatureDeclaration & {
-            typeArguments?: NodeArray<TypeNode>;
-        }) | undefined;
-        /** Note that the resulting nodes cannot be checked. */
-        indexInfoToIndexSignatureDeclaration(indexInfo: IndexInfo, kind: IndexKind, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): IndexSignatureDeclaration | undefined;
-        /** Note that the resulting nodes cannot be checked. */
-        symbolToEntityName(symbol: Symbol, meaning: SymbolFlags, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): EntityName | undefined;
-        /** Note that the resulting nodes cannot be checked. */
-        symbolToExpression(symbol: Symbol, meaning: SymbolFlags, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): Expression | undefined;
-        /** Note that the resulting nodes cannot be checked. */
-        symbolToTypeParameterDeclarations(symbol: Symbol, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): NodeArray<TypeParameterDeclaration> | undefined;
-        /** Note that the resulting nodes cannot be checked. */
-        symbolToParameterDeclaration(symbol: Symbol, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): ParameterDeclaration | undefined;
-        /** Note that the resulting nodes cannot be checked. */
-        typeParameterToDeclaration(parameter: TypeParameter, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): TypeParameterDeclaration | undefined;
-        getSymbolsInScope(location: Node, meaning: SymbolFlags): Symbol[];
-        getSymbolAtLocation(node: Node): Symbol | undefined;
-        getSymbolsOfParameterPropertyDeclaration(parameter: ParameterDeclaration, parameterName: string): Symbol[];
-        /**
-         * The function returns the value (local variable) symbol of an identifier in the short-hand property assignment.
-         * This is necessary as an identifier in short-hand property assignment can contains two meaning: property name and property value.
-         */
-        getShorthandAssignmentValueSymbol(location: Node): Symbol | undefined;
-        getExportSpecifierLocalTargetSymbol(location: ExportSpecifier): Symbol | undefined;
-        /**
-         * If a symbol is a local symbol with an associated exported symbol, returns the exported symbol.
-         * Otherwise returns its input.
-         * For example, at `export type T = number;`:
-         *     - `getSymbolAtLocation` at the location `T` will return the exported symbol for `T`.
-         *     - But the result of `getSymbolsInScope` will contain the *local* symbol for `T`, not the exported symbol.
-         *     - Calling `getExportSymbolOfSymbol` on that local symbol will return the exported symbol.
-         */
-        getExportSymbolOfSymbol(symbol: Symbol): Symbol;
-        getPropertySymbolOfDestructuringAssignment(location: Identifier): Symbol | undefined;
-        getTypeAtLocation(node: Node): Type | undefined;
-        getTypeFromTypeNode(node: TypeNode): Type;
-        signatureToString(signature: Signature, enclosingDeclaration?: Node, flags?: TypeFormatFlags, kind?: SignatureKind): string;
-        typeToString(type: Type, enclosingDeclaration?: Node, flags?: TypeFormatFlags): string;
-        symbolToString(symbol: Symbol, enclosingDeclaration?: Node, meaning?: SymbolFlags, flags?: SymbolFormatFlags): string;
-        typePredicateToString(predicate: TypePredicate, enclosingDeclaration?: Node, flags?: TypeFormatFlags): string;
-        /**
-         * @deprecated Use the createX factory functions or XToY typechecker methods and `createPrinter` or the `xToString` methods instead
-         * This will be removed in a future version.
-         */
-        getSymbolDisplayBuilder(): SymbolDisplayBuilder;
-        getFullyQualifiedName(symbol: Symbol): string;
-        getAugmentedPropertiesOfType(type: Type): Symbol[];
-        getRootSymbols(symbol: Symbol): Symbol[];
-        getContextualType(node: Expression): Type | undefined;
-        /**
-         * returns unknownSignature in the case of an error.
-         * returns undefined if the node is not valid.
-         * @param argumentCount Apparent number of arguments, passed in case of a possibly incomplete call. This should come from an ArgumentListInfo. See `signatureHelp.ts`.
-         */
-        getResolvedSignature(node: CallLikeExpression, candidatesOutArray?: Signature[], argumentCount?: number): Signature | undefined;
-        getSignatureFromDeclaration(declaration: SignatureDeclaration): Signature | undefined;
-        isImplementationOfOverload(node: SignatureDeclaration): boolean | undefined;
-        isUndefinedSymbol(symbol: Symbol): boolean;
-        isArgumentsSymbol(symbol: Symbol): boolean;
-        isUnknownSymbol(symbol: Symbol): boolean;
-        getConstantValue(node: EnumMember | PropertyAccessExpression | ElementAccessExpression): string | number | undefined;
-        isValidPropertyAccess(node: PropertyAccessExpression | QualifiedName | ImportTypeNode, propertyName: string): boolean;
-        /** Follow all aliases to get the original symbol. */
-        getAliasedSymbol(symbol: Symbol): Symbol;
-        getExportsOfModule(moduleSymbol: Symbol): Symbol[];
-        getAllAttributesTypeFromJsxOpeningLikeElement(elementNode: JsxOpeningLikeElement): Type | undefined;
-        getJsxIntrinsicTagNamesAt(location: Node): Symbol[];
-        isOptionalParameter(node: ParameterDeclaration): boolean;
-        getAmbientModules(): Symbol[];
-        tryGetMemberInModuleExports(memberName: string, moduleSymbol: Symbol): Symbol | undefined;
-        getApparentType(type: Type): Type;
-        getSuggestionForNonexistentProperty(node: Identifier, containingType: Type): string | undefined;
-        getSuggestionForNonexistentSymbol(location: Node, name: string, meaning: SymbolFlags): string | undefined;
-        getSuggestionForNonexistentModule(node: Identifier, target: Symbol): string | undefined;
-        getBaseConstraintOfType(type: Type): Type | undefined;
-        getDefaultFromTypeParameter(type: Type): Type | undefined;
-        /**
-         * Depending on the operation performed, it may be appropriate to throw away the checker
-         * if the cancellation token is triggered. Typically, if it is used for error checking
-         * and the operation is cancelled, then it should be discarded, otherwise it is safe to keep.
-         */
-        runWithCancellationToken<T>(token: CancellationToken, cb: (checker: TypeChecker) => T): T;
-    }
-    enum NodeBuilderFlags {
-        None = 0,
-        NoTruncation = 1,
-        WriteArrayAsGenericType = 2,
-        GenerateNamesForShadowedTypeParams = 4,
-        UseStructuralFallback = 8,
-        ForbidIndexedAccessSymbolReferences = 16,
-        WriteTypeArgumentsOfSignature = 32,
-        UseFullyQualifiedType = 64,
-        UseOnlyExternalAliasing = 128,
-        SuppressAnyReturnType = 256,
-        WriteTypeParametersInQualifiedName = 512,
-        MultilineObjectLiterals = 1024,
-        WriteClassExpressionAsTypeLiteral = 2048,
-        UseTypeOfFunction = 4096,
-        OmitParameterModifiers = 8192,
-        UseAliasDefinedOutsideCurrentScope = 16384,
-        AllowThisInObjectLiteral = 32768,
-        AllowQualifedNameInPlaceOfIdentifier = 65536,
-        AllowAnonymousIdentifier = 131072,
-        AllowEmptyUnionOrIntersection = 262144,
-        AllowEmptyTuple = 524288,
-        AllowUniqueESSymbolType = 1048576,
-        AllowEmptyIndexInfoType = 2097152,
-        IgnoreErrors = 3112960,
-        InObjectTypeLiteral = 4194304,
-        InTypeAlias = 8388608,
-        InInitialEntityName = 16777216,
-        InReverseMappedType = 33554432
-    }
-    enum TypeFormatFlags {
-        None = 0,
-        NoTruncation = 1,
-        WriteArrayAsGenericType = 2,
-        UseStructuralFallback = 8,
-        WriteTypeArgumentsOfSignature = 32,
-        UseFullyQualifiedType = 64,
-        SuppressAnyReturnType = 256,
-        MultilineObjectLiterals = 1024,
-        WriteClassExpressionAsTypeLiteral = 2048,
-        UseTypeOfFunction = 4096,
-        OmitParameterModifiers = 8192,
-        UseAliasDefinedOutsideCurrentScope = 16384,
-        AllowUniqueESSymbolType = 1048576,
-        AddUndefined = 131072,
-        WriteArrowStyleSignature = 262144,
-        InArrayType = 524288,
-        InElementType = 2097152,
-        InFirstTypeArgument = 4194304,
-        InTypeAlias = 8388608,
-        /** @deprecated */ WriteOwnNameForAnyLike = 0,
-        NodeBuilderFlagsMask = 9469291
-    }
-    enum SymbolFormatFlags {
-        None = 0,
-        WriteTypeParametersOrArguments = 1,
-        UseOnlyExternalAliasing = 2,
-        AllowAnyNodeKind = 4,
-        UseAliasDefinedOutsideCurrentScope = 8
-    }
-    /**
-     * @deprecated
-     */
-    interface SymbolDisplayBuilder {
-        /** @deprecated */ buildTypeDisplay(type: Type, writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags): void;
-        /** @deprecated */ buildSymbolDisplay(symbol: Symbol, writer: SymbolWriter, enclosingDeclaration?: Node, meaning?: SymbolFlags, flags?: SymbolFormatFlags): void;
-        /** @deprecated */ buildSignatureDisplay(signature: Signature, writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags, kind?: SignatureKind): void;
-        /** @deprecated */ buildIndexSignatureDisplay(info: IndexInfo, writer: SymbolWriter, kind: IndexKind, enclosingDeclaration?: Node, globalFlags?: TypeFormatFlags, symbolStack?: Symbol[]): void;
-        /** @deprecated */ buildParameterDisplay(parameter: Symbol, writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags): void;
-        /** @deprecated */ buildTypeParameterDisplay(tp: TypeParameter, writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags): void;
-        /** @deprecated */ buildTypePredicateDisplay(predicate: TypePredicate, writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags): void;
-        /** @deprecated */ buildTypeParameterDisplayFromSymbol(symbol: Symbol, writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags): void;
-        /** @deprecated */ buildDisplayForParametersAndDelimiters(thisParameter: Symbol, parameters: Symbol[], writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags): void;
-        /** @deprecated */ buildDisplayForTypeParametersAndDelimiters(typeParameters: TypeParameter[], writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags): void;
-        /** @deprecated */ buildReturnTypeDisplay(signature: Signature, writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags): void;
-    }
-    /**
-     * @deprecated Migrate to other methods of generating symbol names, ex symbolToEntityName + a printer or symbolToString
-     */
-    interface SymbolWriter extends SymbolTracker {
-        writeKeyword(text: string): void;
-        writeOperator(text: string): void;
-        writePunctuation(text: string): void;
-        writeSpace(text: string): void;
-        writeStringLiteral(text: string): void;
-        writeParameter(text: string): void;
-        writeProperty(text: string): void;
-        writeSymbol(text: string, symbol: Symbol): void;
-        writeLine(): void;
-        increaseIndent(): void;
-        decreaseIndent(): void;
-        clear(): void;
-    }
-    enum TypePredicateKind {
-        This = 0,
-        Identifier = 1
-    }
-    interface TypePredicateBase {
-        kind: TypePredicateKind;
-        type: Type;
-    }
-    interface ThisTypePredicate extends TypePredicateBase {
-        kind: TypePredicateKind.This;
-    }
-    interface IdentifierTypePredicate extends TypePredicateBase {
-        kind: TypePredicateKind.Identifier;
-        parameterName: string;
-        parameterIndex: number;
-    }
-    type TypePredicate = IdentifierTypePredicate | ThisTypePredicate;
-    enum SymbolFlags {
-        None = 0,
-        FunctionScopedVariable = 1,
-        BlockScopedVariable = 2,
-        Property = 4,
-        EnumMember = 8,
-        Function = 16,
-        Class = 32,
-        Interface = 64,
-        ConstEnum = 128,
-        RegularEnum = 256,
-        ValueModule = 512,
-        NamespaceModule = 1024,
-        TypeLiteral = 2048,
-        ObjectLiteral = 4096,
-        Method = 8192,
-        Constructor = 16384,
-        GetAccessor = 32768,
-        SetAccessor = 65536,
-        Signature = 131072,
-        TypeParameter = 262144,
-        TypeAlias = 524288,
-        ExportValue = 1048576,
-        Alias = 2097152,
-        Prototype = 4194304,
-        ExportStar = 8388608,
-        Optional = 16777216,
-        Transient = 33554432,
-        JSContainer = 67108864,
-        Enum = 384,
-        Variable = 3,
-        Value = 67216319,
-        Type = 67901928,
-        Namespace = 1920,
-        Module = 1536,
-        Accessor = 98304,
-        FunctionScopedVariableExcludes = 67216318,
-        BlockScopedVariableExcludes = 67216319,
-        ParameterExcludes = 67216319,
-        PropertyExcludes = 0,
-        EnumMemberExcludes = 68008959,
-        FunctionExcludes = 67215791,
-        ClassExcludes = 68008383,
-        InterfaceExcludes = 67901832,
-        RegularEnumExcludes = 68008191,
-        ConstEnumExcludes = 68008831,
-        ValueModuleExcludes = 67215503,
-        NamespaceModuleExcludes = 0,
-        MethodExcludes = 67208127,
-        GetAccessorExcludes = 67150783,
-        SetAccessorExcludes = 67183551,
-        TypeParameterExcludes = 67639784,
-        TypeAliasExcludes = 67901928,
-        AliasExcludes = 2097152,
-        ModuleMember = 2623475,
-        ExportHasLocal = 944,
-        HasExports = 1952,
-        HasMembers = 6240,
-        BlockScoped = 418,
-        PropertyOrAccessor = 98308,
-        ClassMember = 106500
-    }
-    interface Symbol {
-        flags: SymbolFlags;
-        escapedName: __String;
-        declarations: Declaration[];
-        valueDeclaration: Declaration;
-        members?: SymbolTable;
-        exports?: SymbolTable;
-        globalExports?: SymbolTable;
-    }
-    enum InternalSymbolName {
-        Call = "__call",
-        Constructor = "__constructor",
-        New = "__new",
-        Index = "__index",
-        ExportStar = "__export",
-        Global = "__global",
-        Missing = "__missing",
-        Type = "__type",
-        Object = "__object",
-        JSXAttributes = "__jsxAttributes",
-        Class = "__class",
-        Function = "__function",
-        Computed = "__computed",
-        Resolving = "__resolving__",
-        ExportEquals = "export=",
-        Default = "default"
-    }
-    /**
-     * This represents a string whose leading underscore have been escaped by adding extra leading underscores.
-     * The shape of this brand is rather unique compared to others we've used.
-     * Instead of just an intersection of a string and an object, it is that union-ed
-     * with an intersection of void and an object. This makes it wholly incompatible
-     * with a normal string (which is good, it cannot be misused on assignment or on usage),
-     * while still being comparable with a normal string via === (also good) and castable from a string.
-     */
-    type __String = (string & {
-        __escapedIdentifier: void;
-    }) | (void & {
-        __escapedIdentifier: void;
-    }) | InternalSymbolName;
-    /** ReadonlyMap where keys are `__String`s. */
-    interface ReadonlyUnderscoreEscapedMap<T> {
-        get(key: __String): T | undefined;
-        has(key: __String): boolean;
-        forEach(action: (value: T, key: __String) => void): void;
-        readonly size: number;
-        keys(): Iterator<__String>;
-        values(): Iterator<T>;
-        entries(): Iterator<[__String, T]>;
-    }
-    /** Map where keys are `__String`s. */
-    interface UnderscoreEscapedMap<T> extends ReadonlyUnderscoreEscapedMap<T> {
-        set(key: __String, value: T): this;
-        delete(key: __String): boolean;
-        clear(): void;
-    }
-    /** SymbolTable based on ES6 Map interface. */
-    type SymbolTable = UnderscoreEscapedMap<Symbol>;
-    enum TypeFlags {
-        Any = 1,
-        Unknown = 2,
-        String = 4,
-        Number = 8,
-        Boolean = 16,
-        Enum = 32,
-        StringLiteral = 64,
-        NumberLiteral = 128,
-        BooleanLiteral = 256,
-        EnumLiteral = 512,
-        ESSymbol = 1024,
-        UniqueESSymbol = 2048,
-        Void = 4096,
-        Undefined = 8192,
-        Null = 16384,
-        Never = 32768,
-        TypeParameter = 65536,
-        Object = 131072,
-        Union = 262144,
-        Intersection = 524288,
-        Index = 1048576,
-        IndexedAccess = 2097152,
-        Conditional = 4194304,
-        Substitution = 8388608,
-        NonPrimitive = 16777216,
-        Literal = 448,
-        Unit = 27072,
-        StringOrNumberLiteral = 192,
-        PossiblyFalsy = 29148,
-        StringLike = 68,
-        NumberLike = 168,
-        BooleanLike = 272,
-        EnumLike = 544,
-        ESSymbolLike = 3072,
-        VoidLike = 12288,
-        UnionOrIntersection = 786432,
-        StructuredType = 917504,
-        TypeVariable = 2162688,
-        InstantiableNonPrimitive = 14745600,
-        InstantiablePrimitive = 1048576,
-        Instantiable = 15794176,
-        StructuredOrInstantiable = 16711680,
-        Narrowable = 33492479,
-        NotUnionOrUnit = 16909315
-    }
-    type DestructuringPattern = BindingPattern | ObjectLiteralExpression | ArrayLiteralExpression;
-    interface Type {
-        flags: TypeFlags;
-        symbol: Symbol;
-        pattern?: DestructuringPattern;
-        aliasSymbol?: Symbol;
-        aliasTypeArguments?: Type[];
-    }
-    interface LiteralType extends Type {
-        value: string | number;
-        freshType: LiteralType;
-        regularType: LiteralType;
-    }
-    interface UniqueESSymbolType extends Type {
-        symbol: Symbol;
-    }
-    interface StringLiteralType extends LiteralType {
-        value: string;
-    }
-    interface NumberLiteralType extends LiteralType {
-        value: number;
-    }
-    interface EnumType extends Type {
-    }
-    enum ObjectFlags {
-        Class = 1,
-        Interface = 2,
-        Reference = 4,
-        Tuple = 8,
-        Anonymous = 16,
-        Mapped = 32,
-        Instantiated = 64,
-        ObjectLiteral = 128,
-        EvolvingArray = 256,
-        ObjectLiteralPatternWithComputedProperties = 512,
-        ContainsSpread = 1024,
-        ReverseMapped = 2048,
-        JsxAttributes = 4096,
-        MarkerType = 8192,
-        ClassOrInterface = 3
-    }
-    interface ObjectType extends Type {
-        objectFlags: ObjectFlags;
-    }
-    /** Class and interface types (ObjectFlags.Class and ObjectFlags.Interface). */
-    interface InterfaceType extends ObjectType {
-        typeParameters: TypeParameter[] | undefined;
-        outerTypeParameters: TypeParameter[] | undefined;
-        localTypeParameters: TypeParameter[] | undefined;
-        thisType: TypeParameter | undefined;
-    }
-    type BaseType = ObjectType | IntersectionType;
-    interface InterfaceTypeWithDeclaredMembers extends InterfaceType {
-        declaredProperties: Symbol[];
-        declaredCallSignatures: Signature[];
-        declaredConstructSignatures: Signature[];
-        declaredStringIndexInfo?: IndexInfo;
-        declaredNumberIndexInfo?: IndexInfo;
-    }
-    /**
-     * Type references (ObjectFlags.Reference). When a class or interface has type parameters or
-     * a "this" type, references to the class or interface are made using type references. The
-     * typeArguments property specifies the types to substitute for the type parameters of the
-     * class or interface and optionally includes an extra element that specifies the type to
-     * substitute for "this" in the resulting instantiation. When no extra argument is present,
-     * the type reference itself is substituted for "this". The typeArguments property is undefined
-     * if the class or interface has no type parameters and the reference isn't specifying an
-     * explicit "this" argument.
-     */
-    interface TypeReference extends ObjectType {
-        target: GenericType;
-        typeArguments?: Type[];
-    }
-    interface GenericType extends InterfaceType, TypeReference {
-    }
-    interface UnionOrIntersectionType extends Type {
-        types: Type[];
-    }
-    interface UnionType extends UnionOrIntersectionType {
-    }
-    interface IntersectionType extends UnionOrIntersectionType {
-    }
-    type StructuredType = ObjectType | UnionType | IntersectionType;
-    interface EvolvingArrayType extends ObjectType {
-        elementType: Type;
-        finalArrayType?: Type;
-    }
-    interface InstantiableType extends Type {
-    }
-    interface TypeParameter extends InstantiableType {
-    }
-    interface IndexedAccessType extends InstantiableType {
-        objectType: Type;
-        indexType: Type;
-        constraint?: Type;
-        simplified?: Type;
-    }
-    type TypeVariable = TypeParameter | IndexedAccessType;
-    interface IndexType extends InstantiableType {
-        type: InstantiableType | UnionOrIntersectionType;
-    }
-    interface ConditionalRoot {
-        node: ConditionalTypeNode;
-        checkType: Type;
-        extendsType: Type;
-        trueType: Type;
-        falseType: Type;
-        isDistributive: boolean;
-        inferTypeParameters?: TypeParameter[];
-        outerTypeParameters?: TypeParameter[];
-        instantiations?: Map<Type>;
-        aliasSymbol?: Symbol;
-        aliasTypeArguments?: Type[];
-    }
-    interface ConditionalType extends InstantiableType {
-        root: ConditionalRoot;
-        checkType: Type;
-        extendsType: Type;
-        resolvedTrueType?: Type;
-        resolvedFalseType?: Type;
-    }
-    interface SubstitutionType extends InstantiableType {
-        typeVariable: TypeVariable;
-        substitute: Type;
-    }
-    enum SignatureKind {
-        Call = 0,
-        Construct = 1
-    }
-    interface Signature {
-        declaration?: SignatureDeclaration | JSDocSignature;
-        typeParameters?: TypeParameter[];
-        parameters: Symbol[];
-    }
-    enum IndexKind {
-        String = 0,
-        Number = 1
-    }
-    interface IndexInfo {
-        type: Type;
-        isReadonly: boolean;
-        declaration?: IndexSignatureDeclaration;
-    }
-    enum InferencePriority {
-        NakedTypeVariable = 1,
-        HomomorphicMappedType = 2,
-        MappedTypeConstraint = 4,
-        ReturnType = 8,
-        LiteralKeyof = 16,
-        NoConstraints = 32,
-        AlwaysStrict = 64,
-        PriorityImpliesCombination = 28
-    }
-    /** @deprecated Use FileExtensionInfo instead. */
-    type JsFileExtensionInfo = FileExtensionInfo;
-    interface FileExtensionInfo {
-        extension: string;
-        isMixedContent: boolean;
-        scriptKind?: ScriptKind;
-    }
-    interface DiagnosticMessage {
-        key: string;
-        category: DiagnosticCategory;
-        code: number;
-        message: string;
-        reportsUnnecessary?: {};
-    }
-    /**
-     * A linked list of formatted diagnostic messages to be used as part of a multiline message.
-     * It is built from the bottom up, leaving the head to be the "main" diagnostic.
-     * While it seems that DiagnosticMessageChain is structurally similar to DiagnosticMessage,
-     * the difference is that messages are all preformatted in DMC.
-     */
-    interface DiagnosticMessageChain {
-        messageText: string;
-        category: DiagnosticCategory;
-        code: number;
-        next?: DiagnosticMessageChain;
-    }
-    interface Diagnostic {
-        file: SourceFile | undefined;
-        start: number | undefined;
-        length: number | undefined;
-        messageText: string | DiagnosticMessageChain;
-        category: DiagnosticCategory;
-        /** May store more in future. For now, this will simply be `true` to indicate when a diagnostic is an unused-identifier diagnostic. */
-        reportsUnnecessary?: {};
-        code: number;
-        source?: string;
-    }
-    interface DiagnosticWithLocation extends Diagnostic {
-        file: SourceFile;
-        start: number;
-        length: number;
-    }
-    enum DiagnosticCategory {
-        Warning = 0,
-        Error = 1,
-        Suggestion = 2,
-        Message = 3
-    }
-    enum ModuleResolutionKind {
-        Classic = 1,
-        NodeJs = 2
-    }
-    interface PluginImport {
-        name: string;
-    }
-    interface ProjectReference {
-        /** A normalized path on disk */
-        path: string;
-        /** The path as the user originally wrote it */
-        originalPath?: string;
-        /** True if the output of this reference should be prepended to the output of this project. Only valid for --outFile compilations */
-        prepend?: boolean;
-        /** True if it is intended that this reference form a circularity */
-        circular?: boolean;
-    }
-    type CompilerOptionsValue = string | number | boolean | (string | number)[] | string[] | MapLike<string[]> | PluginImport[] | ProjectReference[] | null | undefined;
-    interface CompilerOptions {
-        allowJs?: boolean;
-        allowSyntheticDefaultImports?: boolean;
-        allowUnreachableCode?: boolean;
-        allowUnusedLabels?: boolean;
-        alwaysStrict?: boolean;
-        baseUrl?: string;
-        charset?: string;
-        checkJs?: boolean;
-        declaration?: boolean;
-        declarationMap?: boolean;
-        emitDeclarationOnly?: boolean;
-        declarationDir?: string;
-        disableSizeLimit?: boolean;
-        downlevelIteration?: boolean;
-        emitBOM?: boolean;
-        emitDecoratorMetadata?: boolean;
-        experimentalDecorators?: boolean;
-        forceConsistentCasingInFileNames?: boolean;
-        importHelpers?: boolean;
-        inlineSourceMap?: boolean;
-        inlineSources?: boolean;
-        isolatedModules?: boolean;
-        jsx?: JsxEmit;
-        keyofStringsOnly?: boolean;
-        lib?: string[];
-        locale?: string;
-        mapRoot?: string;
-        maxNodeModuleJsDepth?: number;
-        module?: ModuleKind;
-        moduleResolution?: ModuleResolutionKind;
-        newLine?: NewLineKind;
-        noEmit?: boolean;
-        noEmitHelpers?: boolean;
-        noEmitOnError?: boolean;
-        noErrorTruncation?: boolean;
-        noFallthroughCasesInSwitch?: boolean;
-        noImplicitAny?: boolean;
-        noImplicitReturns?: boolean;
-        noImplicitThis?: boolean;
-        noStrictGenericChecks?: boolean;
-        noUnusedLocals?: boolean;
-        noUnusedParameters?: boolean;
-        noImplicitUseStrict?: boolean;
-        noLib?: boolean;
-        noResolve?: boolean;
-        out?: string;
-        outDir?: string;
-        outFile?: string;
-        paths?: MapLike<string[]>;
-        preserveConstEnums?: boolean;
-        preserveSymlinks?: boolean;
-        project?: string;
-        reactNamespace?: string;
-        jsxFactory?: string;
-        composite?: boolean;
-        removeComments?: boolean;
-        rootDir?: string;
-        rootDirs?: string[];
-        skipLibCheck?: boolean;
-        skipDefaultLibCheck?: boolean;
-        sourceMap?: boolean;
-        sourceRoot?: string;
-        strict?: boolean;
-        strictFunctionTypes?: boolean;
-        strictNullChecks?: boolean;
-        strictPropertyInitialization?: boolean;
-        suppressExcessPropertyErrors?: boolean;
-        suppressImplicitAnyIndexErrors?: boolean;
-        target?: ScriptTarget;
-        traceResolution?: boolean;
-        resolveJsonModule?: boolean;
-        types?: string[];
-        /** Paths used to compute primary types search locations */
-        typeRoots?: string[];
-        esModuleInterop?: boolean;
-        [option: string]: CompilerOptionsValue | TsConfigSourceFile | undefined;
-    }
-    interface TypeAcquisition {
-        enableAutoDiscovery?: boolean;
-        enable?: boolean;
-        include?: string[];
-        exclude?: string[];
-        [option: string]: string[] | boolean | undefined;
-    }
-    enum ModuleKind {
-        None = 0,
-        CommonJS = 1,
-        AMD = 2,
-        UMD = 3,
-        System = 4,
-        ES2015 = 5,
-        ESNext = 6
-    }
-    enum JsxEmit {
-        None = 0,
-        Preserve = 1,
-        React = 2,
-        ReactNative = 3
-    }
-    enum NewLineKind {
-        CarriageReturnLineFeed = 0,
-        LineFeed = 1
-    }
-    interface LineAndCharacter {
-        /** 0-based. */
-        line: number;
-        character: number;
-    }
-    enum ScriptKind {
-        Unknown = 0,
-        JS = 1,
-        JSX = 2,
-        TS = 3,
-        TSX = 4,
-        External = 5,
-        JSON = 6,
-        /**
-         * Used on extensions that doesn't define the ScriptKind but the content defines it.
-         * Deferred extensions are going to be included in all project contexts.
-         */
-        Deferred = 7
-    }
-    enum ScriptTarget {
-        ES3 = 0,
-        ES5 = 1,
-        ES2015 = 2,
-        ES2016 = 3,
-        ES2017 = 4,
-        ES2018 = 5,
-        ESNext = 6,
-        JSON = 100,
-        Latest = 6
-    }
-    enum LanguageVariant {
-        Standard = 0,
-        JSX = 1
-    }
-    /** Either a parsed command line or a parsed tsconfig.json */
-    interface ParsedCommandLine {
-        options: CompilerOptions;
-        typeAcquisition?: TypeAcquisition;
-        fileNames: string[];
-        projectReferences?: ReadonlyArray<ProjectReference>;
-        raw?: any;
-        errors: Diagnostic[];
-        wildcardDirectories?: MapLike<WatchDirectoryFlags>;
-        compileOnSave?: boolean;
-    }
-    enum WatchDirectoryFlags {
-        None = 0,
-        Recursive = 1
-    }
-    interface ExpandResult {
-        fileNames: string[];
-        projectReferences: ReadonlyArray<ProjectReference> | undefined;
-        wildcardDirectories: MapLike<WatchDirectoryFlags>;
-    }
-    interface CreateProgramOptions {
-        rootNames: ReadonlyArray<string>;
-        options: CompilerOptions;
-        projectReferences?: ReadonlyArray<ProjectReference>;
-        host?: CompilerHost;
-        oldProgram?: Program;
-        configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>;
-    }
-    interface ModuleResolutionHost {
-        fileExists(fileName: string): boolean;
-        readFile(fileName: string): string | undefined;
-        trace?(s: string): void;
-        directoryExists?(directoryName: string): boolean;
-        /**
-         * Resolve a symbolic link.
-         * @see https://nodejs.org/api/fs.html#fs_fs_realpathsync_path_options
-         */
-        realpath?(path: string): string;
-        getCurrentDirectory?(): string;
-        getDirectories?(path: string): string[];
-    }
-    /**
-     * Represents the result of module resolution.
-     * Module resolution will pick up tsx/jsx/js files even if '--jsx' and '--allowJs' are turned off.
-     * The Program will then filter results based on these flags.
-     *
-     * Prefer to return a `ResolvedModuleFull` so that the file type does not have to be inferred.
-     */
-    interface ResolvedModule {
-        /** Path of the file the module was resolved to. */
-        resolvedFileName: string;
-        /** True if `resolvedFileName` comes from `node_modules`. */
-        isExternalLibraryImport?: boolean;
-    }
-    /**
-     * ResolvedModule with an explicitly provided `extension` property.
-     * Prefer this over `ResolvedModule`.
-     * If changing this, remember to change `moduleResolutionIsEqualTo`.
-     */
-    interface ResolvedModuleFull extends ResolvedModule {
-        /**
-         * Extension of resolvedFileName. This must match what's at the end of resolvedFileName.
-         * This is optional for backwards-compatibility, but will be added if not provided.
-         */
-        extension: Extension;
-        packageId?: PackageId;
-    }
-    /**
-     * Unique identifier with a package name and version.
-     * If changing this, remember to change `packageIdIsEqual`.
-     */
-    interface PackageId {
-        /**
-         * Name of the package.
-         * Should not include `@types`.
-         * If accessing a non-index file, this should include its name e.g. "foo/bar".
-         */
-        name: string;
-        /**
-         * Name of a submodule within this package.
-         * May be "".
-         */
-        subModuleName: string;
-        /** Version of the package, e.g. "1.2.3" */
-        version: string;
-    }
-    enum Extension {
-        Ts = ".ts",
-        Tsx = ".tsx",
-        Dts = ".d.ts",
-        Js = ".js",
-        Jsx = ".jsx",
-        Json = ".json"
-    }
-    interface ResolvedModuleWithFailedLookupLocations {
-        readonly resolvedModule: ResolvedModuleFull | undefined;
-    }
-    interface ResolvedTypeReferenceDirective {
-        primary: boolean;
-        resolvedFileName: string | undefined;
-        packageId?: PackageId;
-    }
-    interface ResolvedTypeReferenceDirectiveWithFailedLookupLocations {
-        readonly resolvedTypeReferenceDirective: ResolvedTypeReferenceDirective | undefined;
-        readonly failedLookupLocations: ReadonlyArray<string>;
-    }
-    interface CompilerHost extends ModuleResolutionHost {
-        getSourceFile(fileName: string, languageVersion: ScriptTarget, onError?: (message: string) => void, shouldCreateNewSourceFile?: boolean): SourceFile | undefined;
-        getSourceFileByPath?(fileName: string, path: Path, languageVersion: ScriptTarget, onError?: (message: string) => void, shouldCreateNewSourceFile?: boolean): SourceFile | undefined;
-        getCancellationToken?(): CancellationToken;
-        getDefaultLibFileName(options: CompilerOptions): string;
-        getDefaultLibLocation?(): string;
-        writeFile: WriteFileCallback;
-        getCurrentDirectory(): string;
-        getDirectories(path: string): string[];
-        getCanonicalFileName(fileName: string): string;
-        useCaseSensitiveFileNames(): boolean;
-        getNewLine(): string;
-        readDirectory?(rootDir: string, extensions: ReadonlyArray<string>, excludes: ReadonlyArray<string> | undefined, includes: ReadonlyArray<string>, depth?: number): string[];
-        resolveModuleNames?(moduleNames: string[], containingFile: string, reusedNames?: string[]): (ResolvedModule | undefined)[];
-        /**
-         * This method is a companion for 'resolveModuleNames' and is used to resolve 'types' references to actual type declaration files
-         */
-        resolveTypeReferenceDirectives?(typeReferenceDirectiveNames: string[], containingFile: string): ResolvedTypeReferenceDirective[];
-        getEnvironmentVariable?(name: string): string | undefined;
-        createHash?(data: string): string;
-        getModifiedTime?(fileName: string): Date;
-        setModifiedTime?(fileName: string, date: Date): void;
-        deleteFile?(fileName: string): void;
-    }
-    interface SourceMapRange extends TextRange {
-        source?: SourceMapSource;
-    }
-    interface SourceMapSource {
-        fileName: string;
-        text: string;
-        skipTrivia?: (pos: number) => number;
-    }
-    enum EmitFlags {
-        None = 0,
-        SingleLine = 1,
-        AdviseOnEmitNode = 2,
-        NoSubstitution = 4,
-        CapturesThis = 8,
-        NoLeadingSourceMap = 16,
-        NoTrailingSourceMap = 32,
-        NoSourceMap = 48,
-        NoNestedSourceMaps = 64,
-        NoTokenLeadingSourceMaps = 128,
-        NoTokenTrailingSourceMaps = 256,
-        NoTokenSourceMaps = 384,
-        NoLeadingComments = 512,
-        NoTrailingComments = 1024,
-        NoComments = 1536,
-        NoNestedComments = 2048,
-        HelperName = 4096,
-        ExportName = 8192,
-        LocalName = 16384,
-        InternalName = 32768,
-        Indented = 65536,
-        NoIndentation = 131072,
-        AsyncFunctionBody = 262144,
-        ReuseTempVariableScope = 524288,
-        CustomPrologue = 1048576,
-        NoHoisting = 2097152,
-        HasEndOfDeclarationMarker = 4194304,
-        Iterator = 8388608,
-        NoAsciiEscaping = 16777216
-    }
-    interface EmitHelper {
-        readonly name: string;
-        readonly scoped: boolean;
-        readonly text: string | ((node: EmitHelperUniqueNameCallback) => string);
-        readonly priority?: number;
-    }
-    type EmitHelperUniqueNameCallback = (name: string) => string;
-    enum EmitHint {
-        SourceFile = 0,
-        Expression = 1,
-        IdentifierName = 2,
-        MappedTypeParameter = 3,
-        Unspecified = 4
-    }
-    interface TransformationContext {
-        /** Gets the compiler options supplied to the transformer. */
-        getCompilerOptions(): CompilerOptions;
-        /** Starts a new lexical environment. */
-        startLexicalEnvironment(): void;
-        /** Suspends the current lexical environment, usually after visiting a parameter list. */
-        suspendLexicalEnvironment(): void;
-        /** Resumes a suspended lexical environment, usually before visiting a function body. */
-        resumeLexicalEnvironment(): void;
-        /** Ends a lexical environment, returning any declarations. */
-        endLexicalEnvironment(): Statement[] | undefined;
-        /** Hoists a function declaration to the containing scope. */
-        hoistFunctionDeclaration(node: FunctionDeclaration): void;
-        /** Hoists a variable declaration to the containing scope. */
-        hoistVariableDeclaration(node: Identifier): void;
-        /** Records a request for a non-scoped emit helper in the current context. */
-        requestEmitHelper(helper: EmitHelper): void;
-        /** Gets and resets the requested non-scoped emit helpers. */
-        readEmitHelpers(): EmitHelper[] | undefined;
-        /** Enables expression substitutions in the pretty printer for the provided SyntaxKind. */
-        enableSubstitution(kind: SyntaxKind): void;
-        /** Determines whether expression substitutions are enabled for the provided node. */
-        isSubstitutionEnabled(node: Node): boolean;
-        /**
-         * Hook used by transformers to substitute expressions just before they
-         * are emitted by the pretty printer.
-         *
-         * NOTE: Transformation hooks should only be modified during `Transformer` initialization,
-         * before returning the `NodeTransformer` callback.
-         */
-        onSubstituteNode: (hint: EmitHint, node: Node) => Node;
-        /**
-         * Enables before/after emit notifications in the pretty printer for the provided
-         * SyntaxKind.
-         */
-        enableEmitNotification(kind: SyntaxKind): void;
-        /**
-         * Determines whether before/after emit notifications should be raised in the pretty
-         * printer when it emits a node.
-         */
-        isEmitNotificationEnabled(node: Node): boolean;
-        /**
-         * Hook used to allow transformers to capture state before or after
-         * the printer emits a node.
-         *
-         * NOTE: Transformation hooks should only be modified during `Transformer` initialization,
-         * before returning the `NodeTransformer` callback.
-         */
-        onEmitNode: (hint: EmitHint, node: Node, emitCallback: (hint: EmitHint, node: Node) => void) => void;
-    }
-    interface TransformationResult<T extends Node> {
-        /** Gets the transformed source files. */
-        transformed: T[];
-        /** Gets diagnostics for the transformation. */
-        diagnostics?: DiagnosticWithLocation[];
-        /**
-         * Gets a substitute for a node, if one is available; otherwise, returns the original node.
-         *
-         * @param hint A hint as to the intended usage of the node.
-         * @param node The node to substitute.
-         */
-        substituteNode(hint: EmitHint, node: Node): Node;
-        /**
-         * Emits a node with possible notification.
-         *
-         * @param hint A hint as to the intended usage of the node.
-         * @param node The node to emit.
-         * @param emitCallback A callback used to emit the node.
-         */
-        emitNodeWithNotification(hint: EmitHint, node: Node, emitCallback: (hint: EmitHint, node: Node) => void): void;
-        /**
-         * Clean up EmitNode entries on any parse-tree nodes.
-         */
-        dispose(): void;
-    }
-    /**
-     * A function that is used to initialize and return a `Transformer` callback, which in turn
-     * will be used to transform one or more nodes.
-     */
-    type TransformerFactory<T extends Node> = (context: TransformationContext) => Transformer<T>;
-    /**
-     * A function that transforms a node.
-     */
-    type Transformer<T extends Node> = (node: T) => T;
-    /**
-     * A function that accepts and possibly transforms a node.
-     */
-    type Visitor = (node: Node) => VisitResult<Node>;
-    type VisitResult<T extends Node> = T | T[] | undefined;
-    interface Printer {
-        /**
-         * Print a node and its subtree as-is, without any emit transformations.
-         * @param hint A value indicating the purpose of a node. This is primarily used to
-         * distinguish between an `Identifier` used in an expression position, versus an
-         * `Identifier` used as an `IdentifierName` as part of a declaration. For most nodes you
-         * should just pass `Unspecified`.
-         * @param node The node to print. The node and its subtree are printed as-is, without any
-         * emit transformations.
-         * @param sourceFile A source file that provides context for the node. The source text of
-         * the file is used to emit the original source content for literals and identifiers, while
-         * the identifiers of the source file are used when generating unique names to avoid
-         * collisions.
-         */
-        printNode(hint: EmitHint, node: Node, sourceFile: SourceFile): string;
-        /**
-         * Prints a list of nodes using the given format flags
-         */
-        printList<T extends Node>(format: ListFormat, list: NodeArray<T>, sourceFile: SourceFile): string;
-        /**
-         * Prints a source file as-is, without any emit transformations.
-         */
-        printFile(sourceFile: SourceFile): string;
-        /**
-         * Prints a bundle of source files as-is, without any emit transformations.
-         */
-        printBundle(bundle: Bundle): string;
-    }
-    interface PrintHandlers {
-        /**
-         * A hook used by the Printer when generating unique names to avoid collisions with
-         * globally defined names that exist outside of the current source file.
-         */
-        hasGlobalName?(name: string): boolean;
-        /**
-         * A hook used by the Printer to provide notifications prior to emitting a node. A
-         * compatible implementation **must** invoke `emitCallback` with the provided `hint` and
-         * `node` values.
-         * @param hint A hint indicating the intended purpose of the node.
-         * @param node The node to emit.
-         * @param emitCallback A callback that, when invoked, will emit the node.
-         * @example
-         * ```ts
-         * var printer = createPrinter(printerOptions, {
-         *   onEmitNode(hint, node, emitCallback) {
-         *     // set up or track state prior to emitting the node...
-         *     emitCallback(hint, node);
-         *     // restore state after emitting the node...
-         *   }
-         * });
-         * ```
-         */
-        onEmitNode?(hint: EmitHint, node: Node | undefined, emitCallback: (hint: EmitHint, node: Node | undefined) => void): void;
-        /**
-         * A hook used by the Printer to perform just-in-time substitution of a node. This is
-         * primarily used by node transformations that need to substitute one node for another,
-         * such as replacing `myExportedVar` with `exports.myExportedVar`.
-         * @param hint A hint indicating the intended purpose of the node.
-         * @param node The node to emit.
-         * @example
-         * ```ts
-         * var printer = createPrinter(printerOptions, {
-         *   substituteNode(hint, node) {
-         *     // perform substitution if necessary...
-         *     return node;
-         *   }
-         * });
-         * ```
-         */
-        substituteNode?(hint: EmitHint, node: Node): Node;
-    }
-    interface PrinterOptions {
-        removeComments?: boolean;
-        newLine?: NewLineKind;
-        omitTrailingSemicolon?: boolean;
-        noEmitHelpers?: boolean;
-    }
-    interface GetEffectiveTypeRootsHost {
-        directoryExists?(directoryName: string): boolean;
-        getCurrentDirectory?(): string;
-    }
-    /** @deprecated See comment on SymbolWriter */
-    interface SymbolTracker {
-        trackSymbol?(symbol: Symbol, enclosingDeclaration?: Node, meaning?: SymbolFlags): void;
-        reportInaccessibleThisError?(): void;
-        reportPrivateInBaseOfClassExpression?(propertyName: string): void;
-        reportInaccessibleUniqueSymbolError?(): void;
-    }
-    interface TextSpan {
-        start: number;
-        length: number;
-    }
-    interface TextChangeRange {
-        span: TextSpan;
-        newLength: number;
-    }
-    interface SortedArray<T> extends Array<T> {
-        " __sortedArrayBrand": any;
-    }
-    interface SyntaxList extends Node {
-        _children: Node[];
-    }
-    enum ListFormat {
-        None = 0,
-        SingleLine = 0,
-        MultiLine = 1,
-        PreserveLines = 2,
-        LinesMask = 3,
-        NotDelimited = 0,
-        BarDelimited = 4,
-        AmpersandDelimited = 8,
-        CommaDelimited = 16,
-        DelimitersMask = 28,
-        AllowTrailingComma = 32,
-        Indented = 64,
-        SpaceBetweenBraces = 128,
-        SpaceBetweenSiblings = 256,
-        Braces = 512,
-        Parenthesis = 1024,
-        AngleBrackets = 2048,
-        SquareBrackets = 4096,
-        BracketsMask = 7680,
-        OptionalIfUndefined = 8192,
-        OptionalIfEmpty = 16384,
-        Optional = 24576,
-        PreferNewLine = 32768,
-        NoTrailingNewLine = 65536,
-        NoInterveningComments = 131072,
-        NoSpaceIfEmpty = 262144,
-        SingleElement = 524288,
-        Modifiers = 131328,
-        HeritageClauses = 256,
-        SingleLineTypeLiteralMembers = 384,
-        MultiLineTypeLiteralMembers = 16449,
-        TupleTypeElements = 272,
-        UnionTypeConstituents = 260,
-        IntersectionTypeConstituents = 264,
-        ObjectBindingPatternElements = 262576,
-        ArrayBindingPatternElements = 262448,
-        ObjectLiteralExpressionProperties = 263122,
-        ArrayLiteralExpressionElements = 4466,
-        CommaListElements = 272,
-        CallExpressionArguments = 1296,
-        NewExpressionArguments = 9488,
-        TemplateExpressionSpans = 131072,
-        SingleLineBlockStatements = 384,
-        MultiLineBlockStatements = 65,
-        VariableDeclarationList = 272,
-        SingleLineFunctionBodyStatements = 384,
-        MultiLineFunctionBodyStatements = 1,
-        ClassHeritageClauses = 0,
-        ClassMembers = 65,
-        InterfaceMembers = 65,
-        EnumMembers = 81,
-        CaseBlockClauses = 65,
-        NamedImportsOrExportsElements = 262576,
-        JsxElementOrFragmentChildren = 131072,
-        JsxElementAttributes = 131328,
-        CaseOrDefaultClauseStatements = 81985,
-        HeritageClauseTypes = 272,
-        SourceFileStatements = 65537,
-        Decorators = 24577,
-        TypeArguments = 26896,
-        TypeParameters = 26896,
-        Parameters = 1296,
-        IndexSignatureParameters = 4432
-    }
-}
-declare namespace ts {
-    const versionMajorMinor = "3.0";
-    /** The version of the TypeScript compiler release */
-    const version: string;
-}
-declare namespace ts {
-    function isExternalModuleNameRelative(moduleName: string): boolean;
-    function sortAndDeduplicateDiagnostics<T extends Diagnostic>(diagnostics: ReadonlyArray<T>): T[];
-}
-declare function setTimeout(handler: (...args: any[]) => void, timeout: number): any;
-declare function clearTimeout(handle: any): void;
-declare namespace ts {
-    enum FileWatcherEventKind {
-        Created = 0,
-        Changed = 1,
-        Deleted = 2
-    }
-    type FileWatcherCallback = (fileName: string, eventKind: FileWatcherEventKind) => void;
-    type DirectoryWatcherCallback = (fileName: string) => void;
-    interface System {
-        args: string[];
-        newLine: string;
-        useCaseSensitiveFileNames: boolean;
-        write(s: string): void;
-        writeOutputIsTTY?(): boolean;
-        readFile(path: string, encoding?: string): string | undefined;
-        getFileSize?(path: string): number;
-        writeFile(path: string, data: string, writeByteOrderMark?: boolean): void;
-        /**
-         * @pollingInterval - this parameter is used in polling-based watchers and ignored in watchers that
-         * use native OS file watching
-         */
-        watchFile?(path: string, callback: FileWatcherCallback, pollingInterval?: number): FileWatcher;
-        watchDirectory?(path: string, callback: DirectoryWatcherCallback, recursive?: boolean): FileWatcher;
-        resolvePath(path: string): string;
-        fileExists(path: string): boolean;
-        directoryExists(path: string): boolean;
-        createDirectory(path: string): void;
-        getExecutingFilePath(): string;
-        getCurrentDirectory(): string;
-        getDirectories(path: string): string[];
-        readDirectory(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
-        getModifiedTime?(path: string): Date;
-        setModifiedTime?(path: string, time: Date): void;
-        deleteFile?(path: string): void;
-        /**
-         * A good implementation is node.js' `crypto.createHash`. (https://nodejs.org/api/crypto.html#crypto_crypto_createhash_algorithm)
-         */
-        createHash?(data: string): string;
-        /** This must be cryptographically secure. Only implement this method using `crypto.createHash("sha256")`. */
-        createSHA256Hash?(data: string): string;
-        getMemoryUsage?(): number;
-        exit(exitCode?: number): void;
-        realpath?(path: string): string;
-        setTimeout?(callback: (...args: any[]) => void, ms: number, ...args: any[]): any;
-        clearTimeout?(timeoutId: any): void;
-        clearScreen?(): void;
-        base64decode?(input: string): string;
-        base64encode?(input: string): string;
-    }
-    interface FileWatcher {
-        close(): void;
-    }
-    function getNodeMajorVersion(): number | undefined;
-    let sys: System;
-}
-declare namespace ts {
-    type ErrorCallback = (message: DiagnosticMessage, length: number) => void;
-    interface Scanner {
-        getStartPos(): number;
-        getToken(): SyntaxKind;
-        getTextPos(): number;
-        getTokenPos(): number;
-        getTokenText(): string;
-        getTokenValue(): string;
-        hasExtendedUnicodeEscape(): boolean;
-        hasPrecedingLineBreak(): boolean;
-        isIdentifier(): boolean;
-        isReservedWord(): boolean;
-        isUnterminated(): boolean;
-        reScanGreaterToken(): SyntaxKind;
-        reScanSlashToken(): SyntaxKind;
-        reScanTemplateToken(): SyntaxKind;
-        scanJsxIdentifier(): SyntaxKind;
-        scanJsxAttributeValue(): SyntaxKind;
-        reScanJsxToken(): JsxTokenSyntaxKind;
-        scanJsxToken(): JsxTokenSyntaxKind;
-        scanJSDocToken(): JsDocSyntaxKind;
-        scan(): SyntaxKind;
-        getText(): string;
-        setText(text: string | undefined, start?: number, length?: number): void;
-        setOnError(onError: ErrorCallback | undefined): void;
-        setScriptTarget(scriptTarget: ScriptTarget): void;
-        setLanguageVariant(variant: LanguageVariant): void;
-        setTextPos(textPos: number): void;
-        lookAhead<T>(callback: () => T): T;
-        scanRange<T>(start: number, length: number, callback: () => T): T;
-        tryScan<T>(callback: () => T): T;
-    }
-    function tokenToString(t: SyntaxKind): string | undefined;
-    function getPositionOfLineAndCharacter(sourceFile: SourceFileLike, line: number, character: number): number;
-    function getLineAndCharacterOfPosition(sourceFile: SourceFileLike, position: number): LineAndCharacter;
-    function isWhiteSpaceLike(ch: number): boolean;
-    /** Does not include line breaks. For that, see isWhiteSpaceLike. */
-    function isWhiteSpaceSingleLine(ch: number): boolean;
-    function isLineBreak(ch: number): boolean;
-    function couldStartTrivia(text: string, pos: number): boolean;
-    function forEachLeadingCommentRange<U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean) => U): U | undefined;
-    function forEachLeadingCommentRange<T, U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean, state: T) => U, state: T): U | undefined;
-    function forEachTrailingCommentRange<U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean) => U): U | undefined;
-    function forEachTrailingCommentRange<T, U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean, state: T) => U, state: T): U | undefined;
-    function reduceEachLeadingCommentRange<T, U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean, state: T, memo: U) => U, state: T, initial: U): U | undefined;
-    function reduceEachTrailingCommentRange<T, U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean, state: T, memo: U) => U, state: T, initial: U): U | undefined;
-    function getLeadingCommentRanges(text: string, pos: number): CommentRange[] | undefined;
-    function getTrailingCommentRanges(text: string, pos: number): CommentRange[] | undefined;
-    /** Optionally, get the shebang */
-    function getShebang(text: string): string | undefined;
-    function isIdentifierStart(ch: number, languageVersion: ScriptTarget | undefined): boolean;
-    function isIdentifierPart(ch: number, languageVersion: ScriptTarget | undefined): boolean;
-    function createScanner(languageVersion: ScriptTarget, skipTrivia: boolean, languageVariant?: LanguageVariant, textInitial?: string, onError?: ErrorCallback, start?: number, length?: number): Scanner;
-}
-declare namespace ts {
-    function getDefaultLibFileName(options: CompilerOptions): string;
-    function textSpanEnd(span: TextSpan): number;
-    function textSpanIsEmpty(span: TextSpan): boolean;
-    function textSpanContainsPosition(span: TextSpan, position: number): boolean;
-    function textSpanContainsTextSpan(span: TextSpan, other: TextSpan): boolean;
-    function textSpanOverlapsWith(span: TextSpan, other: TextSpan): boolean;
-    function textSpanOverlap(span1: TextSpan, span2: TextSpan): TextSpan | undefined;
-    function textSpanIntersectsWithTextSpan(span: TextSpan, other: TextSpan): boolean;
-    function textSpanIntersectsWith(span: TextSpan, start: number, length: number): boolean;
-    function decodedTextSpanIntersectsWith(start1: number, length1: number, start2: number, length2: number): boolean;
-    function textSpanIntersectsWithPosition(span: TextSpan, position: number): boolean;
-    function textSpanIntersection(span1: TextSpan, span2: TextSpan): TextSpan | undefined;
-    function createTextSpan(start: number, length: number): TextSpan;
-    function createTextSpanFromBounds(start: number, end: number): TextSpan;
-    function textChangeRangeNewSpan(range: TextChangeRange): TextSpan;
-    function textChangeRangeIsUnchanged(range: TextChangeRange): boolean;
-    function createTextChangeRange(span: TextSpan, newLength: number): TextChangeRange;
-    let unchangedTextChangeRange: TextChangeRange;
-    /**
-     * Called to merge all the changes that occurred across several versions of a script snapshot
-     * into a single change.  i.e. if a user keeps making successive edits to a script we will
-     * have a text change from V1 to V2, V2 to V3, ..., Vn.
-     *
-     * This function will then merge those changes into a single change range valid between V1 and
-     * Vn.
-     */
-    function collapseTextChangeRangesAcrossMultipleVersions(changes: ReadonlyArray<TextChangeRange>): TextChangeRange;
-    function getTypeParameterOwner(d: Declaration): Declaration | undefined;
-    type ParameterPropertyDeclaration = ParameterDeclaration & {
-        parent: ConstructorDeclaration;
-        name: Identifier;
-    };
-    function isParameterPropertyDeclaration(node: Node): node is ParameterPropertyDeclaration;
-    function isEmptyBindingPattern(node: BindingName): node is BindingPattern;
-    function isEmptyBindingElement(node: BindingElement): boolean;
-    function getCombinedModifierFlags(node: Node): ModifierFlags;
-    function getCombinedNodeFlags(node: Node): NodeFlags;
-    /**
-     * Checks to see if the locale is in the appropriate format,
-     * and if it is, attempts to set the appropriate language.
-     */
-    function validateLocaleAndSetLanguage(locale: string, sys: {
-        getExecutingFilePath(): string;
-        resolvePath(path: string): string;
-        fileExists(fileName: string): boolean;
-        readFile(fileName: string): string | undefined;
-    }, errors?: Push<Diagnostic>): void;
-    function getOriginalNode(node: Node): Node;
-    function getOriginalNode<T extends Node>(node: Node, nodeTest: (node: Node) => node is T): T;
-    function getOriginalNode(node: Node | undefined): Node | undefined;
-    function getOriginalNode<T extends Node>(node: Node | undefined, nodeTest: (node: Node | undefined) => node is T): T | undefined;
-    /**
-     * Gets a value indicating whether a node originated in the parse tree.
-     *
-     * @param node The node to test.
-     */
-    function isParseTreeNode(node: Node): boolean;
-    /**
-     * Gets the original parse tree node for a node.
-     *
-     * @param node The original node.
-     * @returns The original parse tree node if found; otherwise, undefined.
-     */
-    function getParseTreeNode(node: Node): Node;
-    /**
-     * Gets the original parse tree node for a node.
-     *
-     * @param node The original node.
-     * @param nodeTest A callback used to ensure the correct type of parse tree node is returned.
-     * @returns The original parse tree node if found; otherwise, undefined.
-     */
-    function getParseTreeNode<T extends Node>(node: Node | undefined, nodeTest?: (node: Node) => node is T): T | undefined;
-    /**
-     * Remove extra underscore from escaped identifier text content.
-     *
-     * @param identifier The escaped identifier text.
-     * @returns The unescaped identifier text.
-     */
-    function unescapeLeadingUnderscores(identifier: __String): string;
-    function idText(identifier: Identifier): string;
-    function symbolName(symbol: Symbol): string;
-    /**
-     * Remove extra underscore from escaped identifier text content.
-     * @deprecated Use `id.text` for the unescaped text.
-     * @param identifier The escaped identifier text.
-     * @returns The unescaped identifier text.
-     */
-    function unescapeIdentifier(id: string): string;
-    function getNameOfJSDocTypedef(declaration: JSDocTypedefTag): Identifier | undefined;
-    function getNameOfDeclaration(declaration: Declaration | Expression): DeclarationName;
-    /**
-     * Gets the JSDoc parameter tags for the node if present.
-     *
-     * @remarks Returns any JSDoc param tag that matches the provided
-     * parameter, whether a param tag on a containing function
-     * expression, or a param tag on a variable declaration whose
-     * initializer is the containing function. The tags closest to the
-     * node are returned first, so in the previous example, the param
-     * tag on the containing function expression would be first.
-     *
-     * Does not return tags for binding patterns, because JSDoc matches
-     * parameters by name and binding patterns do not have a name.
-     */
-    function getJSDocParameterTags(param: ParameterDeclaration): ReadonlyArray<JSDocParameterTag>;
-    /**
-     * Return true if the node has JSDoc parameter tags.
-     *
-     * @remarks Includes parameter tags that are not directly on the node,
-     * for example on a variable declaration whose initializer is a function expression.
-     */
-    function hasJSDocParameterTags(node: FunctionLikeDeclaration | SignatureDeclaration): boolean;
-    /** Gets the JSDoc augments tag for the node if present */
-    function getJSDocAugmentsTag(node: Node): JSDocAugmentsTag | undefined;
-    /** Gets the JSDoc class tag for the node if present */
-    function getJSDocClassTag(node: Node): JSDocClassTag | undefined;
-    /** Gets the JSDoc return tag for the node if present */
-    function getJSDocReturnTag(node: Node): JSDocReturnTag | undefined;
-    /** Gets the JSDoc template tag for the node if present */
-    function getJSDocTemplateTag(node: Node): JSDocTemplateTag | undefined;
-    /** Gets the JSDoc type tag for the node if present and valid */
-    function getJSDocTypeTag(node: Node): JSDocTypeTag | undefined;
-    /**
-     * Gets the type node for the node if provided via JSDoc.
-     *
-     * @remarks The search includes any JSDoc param tag that relates
-     * to the provided parameter, for example a type tag on the
-     * parameter itself, or a param tag on a containing function
-     * expression, or a param tag on a variable declaration whose
-     * initializer is the containing function. The tags closest to the
-     * node are examined first, so in the previous example, the type
-     * tag directly on the node would be returned.
-     */
-    function getJSDocType(node: Node): TypeNode | undefined;
-    /**
-     * Gets the return type node for the node if provided via JSDoc's return tag.
-     *
-     * @remarks `getJSDocReturnTag` just gets the whole JSDoc tag. This function
-     * gets the type from inside the braces.
-     */
-    function getJSDocReturnType(node: Node): TypeNode | undefined;
-    /** Get all JSDoc tags related to a node, including those on parent nodes. */
-    function getJSDocTags(node: Node): ReadonlyArray<JSDocTag>;
-    /** Gets all JSDoc tags of a specified kind, or undefined if not present. */
-    function getAllJSDocTagsOfKind(node: Node, kind: SyntaxKind): ReadonlyArray<JSDocTag>;
-}
-declare namespace ts {
-    function isNumericLiteral(node: Node): node is NumericLiteral;
-    function isStringLiteral(node: Node): node is StringLiteral;
-    function isJsxText(node: Node): node is JsxText;
-    function isRegularExpressionLiteral(node: Node): node is RegularExpressionLiteral;
-    function isNoSubstitutionTemplateLiteral(node: Node): node is NoSubstitutionTemplateLiteral;
-    function isTemplateHead(node: Node): node is TemplateHead;
-    function isTemplateMiddle(node: Node): node is TemplateMiddle;
-    function isTemplateTail(node: Node): node is TemplateTail;
-    function isIdentifier(node: Node): node is Identifier;
-    function isQualifiedName(node: Node): node is QualifiedName;
-    function isComputedPropertyName(node: Node): node is ComputedPropertyName;
-    function isTypeParameterDeclaration(node: Node): node is TypeParameterDeclaration;
-    function isParameter(node: Node): node is ParameterDeclaration;
-    function isDecorator(node: Node): node is Decorator;
-    function isPropertySignature(node: Node): node is PropertySignature;
-    function isPropertyDeclaration(node: Node): node is PropertyDeclaration;
-    function isMethodSignature(node: Node): node is MethodSignature;
-    function isMethodDeclaration(node: Node): node is MethodDeclaration;
-    function isConstructorDeclaration(node: Node): node is ConstructorDeclaration;
-    function isGetAccessorDeclaration(node: Node): node is GetAccessorDeclaration;
-    function isSetAccessorDeclaration(node: Node): node is SetAccessorDeclaration;
-    function isCallSignatureDeclaration(node: Node): node is CallSignatureDeclaration;
-    function isConstructSignatureDeclaration(node: Node): node is ConstructSignatureDeclaration;
-    function isIndexSignatureDeclaration(node: Node): node is IndexSignatureDeclaration;
-    function isTypePredicateNode(node: Node): node is TypePredicateNode;
-    function isTypeReferenceNode(node: Node): node is TypeReferenceNode;
-    function isFunctionTypeNode(node: Node): node is FunctionTypeNode;
-    function isConstructorTypeNode(node: Node): node is ConstructorTypeNode;
-    function isTypeQueryNode(node: Node): node is TypeQueryNode;
-    function isTypeLiteralNode(node: Node): node is TypeLiteralNode;
-    function isArrayTypeNode(node: Node): node is ArrayTypeNode;
-    function isTupleTypeNode(node: Node): node is TupleTypeNode;
-    function isUnionTypeNode(node: Node): node is UnionTypeNode;
-    function isIntersectionTypeNode(node: Node): node is IntersectionTypeNode;
-    function isConditionalTypeNode(node: Node): node is ConditionalTypeNode;
-    function isInferTypeNode(node: Node): node is InferTypeNode;
-    function isParenthesizedTypeNode(node: Node): node is ParenthesizedTypeNode;
-    function isThisTypeNode(node: Node): node is ThisTypeNode;
-    function isTypeOperatorNode(node: Node): node is TypeOperatorNode;
-    function isIndexedAccessTypeNode(node: Node): node is IndexedAccessTypeNode;
-    function isMappedTypeNode(node: Node): node is MappedTypeNode;
-    function isLiteralTypeNode(node: Node): node is LiteralTypeNode;
-    function isImportTypeNode(node: Node): node is ImportTypeNode;
-    function isObjectBindingPattern(node: Node): node is ObjectBindingPattern;
-    function isArrayBindingPattern(node: Node): node is ArrayBindingPattern;
-    function isBindingElement(node: Node): node is BindingElement;
-    function isArrayLiteralExpression(node: Node): node is ArrayLiteralExpression;
-    function isObjectLiteralExpression(node: Node): node is ObjectLiteralExpression;
-    function isPropertyAccessExpression(node: Node): node is PropertyAccessExpression;
-    function isElementAccessExpression(node: Node): node is ElementAccessExpression;
-    function isCallExpression(node: Node): node is CallExpression;
-    function isNewExpression(node: Node): node is NewExpression;
-    function isTaggedTemplateExpression(node: Node): node is TaggedTemplateExpression;
-    function isTypeAssertion(node: Node): node is TypeAssertion;
-    function isParenthesizedExpression(node: Node): node is ParenthesizedExpression;
-    function skipPartiallyEmittedExpressions(node: Expression): Expression;
-    function skipPartiallyEmittedExpressions(node: Node): Node;
-    function isFunctionExpression(node: Node): node is FunctionExpression;
-    function isArrowFunction(node: Node): node is ArrowFunction;
-    function isDeleteExpression(node: Node): node is DeleteExpression;
-    function isTypeOfExpression(node: Node): node is TypeOfExpression;
-    function isVoidExpression(node: Node): node is VoidExpression;
-    function isAwaitExpression(node: Node): node is AwaitExpression;
-    function isPrefixUnaryExpression(node: Node): node is PrefixUnaryExpression;
-    function isPostfixUnaryExpression(node: Node): node is PostfixUnaryExpression;
-    function isBinaryExpression(node: Node): node is BinaryExpression;
-    function isConditionalExpression(node: Node): node is ConditionalExpression;
-    function isTemplateExpression(node: Node): node is TemplateExpression;
-    function isYieldExpression(node: Node): node is YieldExpression;
-    function isSpreadElement(node: Node): node is SpreadElement;
-    function isClassExpression(node: Node): node is ClassExpression;
-    function isOmittedExpression(node: Node): node is OmittedExpression;
-    function isExpressionWithTypeArguments(node: Node): node is ExpressionWithTypeArguments;
-    function isAsExpression(node: Node): node is AsExpression;
-    function isNonNullExpression(node: Node): node is NonNullExpression;
-    function isMetaProperty(node: Node): node is MetaProperty;
-    function isTemplateSpan(node: Node): node is TemplateSpan;
-    function isSemicolonClassElement(node: Node): node is SemicolonClassElement;
-    function isBlock(node: Node): node is Block;
-    function isVariableStatement(node: Node): node is VariableStatement;
-    function isEmptyStatement(node: Node): node is EmptyStatement;
-    function isExpressionStatement(node: Node): node is ExpressionStatement;
-    function isIfStatement(node: Node): node is IfStatement;
-    function isDoStatement(node: Node): node is DoStatement;
-    function isWhileStatement(node: Node): node is WhileStatement;
-    function isForStatement(node: Node): node is ForStatement;
-    function isForInStatement(node: Node): node is ForInStatement;
-    function isForOfStatement(node: Node): node is ForOfStatement;
-    function isContinueStatement(node: Node): node is ContinueStatement;
-    function isBreakStatement(node: Node): node is BreakStatement;
-    function isBreakOrContinueStatement(node: Node): node is BreakOrContinueStatement;
-    function isReturnStatement(node: Node): node is ReturnStatement;
-    function isWithStatement(node: Node): node is WithStatement;
-    function isSwitchStatement(node: Node): node is SwitchStatement;
-    function isLabeledStatement(node: Node): node is LabeledStatement;
-    function isThrowStatement(node: Node): node is ThrowStatement;
-    function isTryStatement(node: Node): node is TryStatement;
-    function isDebuggerStatement(node: Node): node is DebuggerStatement;
-    function isVariableDeclaration(node: Node): node is VariableDeclaration;
-    function isVariableDeclarationList(node: Node): node is VariableDeclarationList;
-    function isFunctionDeclaration(node: Node): node is FunctionDeclaration;
-    function isClassDeclaration(node: Node): node is ClassDeclaration;
-    function isInterfaceDeclaration(node: Node): node is InterfaceDeclaration;
-    function isTypeAliasDeclaration(node: Node): node is TypeAliasDeclaration;
-    function isEnumDeclaration(node: Node): node is EnumDeclaration;
-    function isModuleDeclaration(node: Node): node is ModuleDeclaration;
-    function isModuleBlock(node: Node): node is ModuleBlock;
-    function isCaseBlock(node: Node): node is CaseBlock;
-    function isNamespaceExportDeclaration(node: Node): node is NamespaceExportDeclaration;
-    function isImportEqualsDeclaration(node: Node): node is ImportEqualsDeclaration;
-    function isImportDeclaration(node: Node): node is ImportDeclaration;
-    function isImportClause(node: Node): node is ImportClause;
-    function isNamespaceImport(node: Node): node is NamespaceImport;
-    function isNamedImports(node: Node): node is NamedImports;
-    function isImportSpecifier(node: Node): node is ImportSpecifier;
-    function isExportAssignment(node: Node): node is ExportAssignment;
-    function isExportDeclaration(node: Node): node is ExportDeclaration;
-    function isNamedExports(node: Node): node is NamedExports;
-    function isExportSpecifier(node: Node): node is ExportSpecifier;
-    function isMissingDeclaration(node: Node): node is MissingDeclaration;
-    function isExternalModuleReference(node: Node): node is ExternalModuleReference;
-    function isJsxElement(node: Node): node is JsxElement;
-    function isJsxSelfClosingElement(node: Node): node is JsxSelfClosingElement;
-    function isJsxOpeningElement(node: Node): node is JsxOpeningElement;
-    function isJsxClosingElement(node: Node): node is JsxClosingElement;
-    function isJsxFragment(node: Node): node is JsxFragment;
-    function isJsxOpeningFragment(node: Node): node is JsxOpeningFragment;
-    function isJsxClosingFragment(node: Node): node is JsxClosingFragment;
-    function isJsxAttribute(node: Node): node is JsxAttribute;
-    function isJsxAttributes(node: Node): node is JsxAttributes;
-    function isJsxSpreadAttribute(node: Node): node is JsxSpreadAttribute;
-    function isJsxExpression(node: Node): node is JsxExpression;
-    function isCaseClause(node: Node): node is CaseClause;
-    function isDefaultClause(node: Node): node is DefaultClause;
-    function isHeritageClause(node: Node): node is HeritageClause;
-    function isCatchClause(node: Node): node is CatchClause;
-    function isPropertyAssignment(node: Node): node is PropertyAssignment;
-    function isShorthandPropertyAssignment(node: Node): node is ShorthandPropertyAssignment;
-    function isSpreadAssignment(node: Node): node is SpreadAssignment;
-    function isEnumMember(node: Node): node is EnumMember;
-    function isSourceFile(node: Node): node is SourceFile;
-    function isBundle(node: Node): node is Bundle;
-    function isUnparsedSource(node: Node): node is UnparsedSource;
-    function isJSDocTypeExpression(node: Node): node is JSDocTypeExpression;
-    function isJSDocAllType(node: JSDocAllType): node is JSDocAllType;
-    function isJSDocUnknownType(node: Node): node is JSDocUnknownType;
-    function isJSDocNullableType(node: Node): node is JSDocNullableType;
-    function isJSDocNonNullableType(node: Node): node is JSDocNonNullableType;
-    function isJSDocOptionalType(node: Node): node is JSDocOptionalType;
-    function isJSDocFunctionType(node: Node): node is JSDocFunctionType;
-    function isJSDocVariadicType(node: Node): node is JSDocVariadicType;
-    function isJSDoc(node: Node): node is JSDoc;
-    function isJSDocAugmentsTag(node: Node): node is JSDocAugmentsTag;
-    function isJSDocClassTag(node: Node): node is JSDocClassTag;
-    function isJSDocParameterTag(node: Node): node is JSDocParameterTag;
-    function isJSDocReturnTag(node: Node): node is JSDocReturnTag;
-    function isJSDocTypeTag(node: Node): node is JSDocTypeTag;
-    function isJSDocTemplateTag(node: Node): node is JSDocTemplateTag;
-    function isJSDocTypedefTag(node: Node): node is JSDocTypedefTag;
-    function isJSDocPropertyTag(node: Node): node is JSDocPropertyTag;
-    function isJSDocPropertyLikeTag(node: Node): node is JSDocPropertyLikeTag;
-    function isJSDocTypeLiteral(node: Node): node is JSDocTypeLiteral;
-    function isJSDocCallbackTag(node: Node): node is JSDocCallbackTag;
-    function isJSDocSignature(node: Node): node is JSDocSignature;
-}
-declare namespace ts {
-    /**
-     * True if node is of some token syntax kind.
-     * For example, this is true for an IfKeyword but not for an IfStatement.
-     * Literals are considered tokens, except TemplateLiteral, but does include TemplateHead/Middle/Tail.
-     */
-    function isToken(n: Node): boolean;
-    function isLiteralExpression(node: Node): node is LiteralExpression;
-    type TemplateLiteralToken = NoSubstitutionTemplateLiteral | TemplateHead | TemplateMiddle | TemplateTail;
-    function isTemplateLiteralToken(node: Node): node is TemplateLiteralToken;
-    function isTemplateMiddleOrTemplateTail(node: Node): node is TemplateMiddle | TemplateTail;
-    function isStringTextContainingNode(node: Node): node is StringLiteral | TemplateLiteralToken;
-    function isModifier(node: Node): node is Modifier;
-    function isEntityName(node: Node): node is EntityName;
-    function isPropertyName(node: Node): node is PropertyName;
-    function isBindingName(node: Node): node is BindingName;
-    function isFunctionLike(node: Node): node is SignatureDeclaration;
-    function isClassElement(node: Node): node is ClassElement;
-    function isClassLike(node: Node): node is ClassLikeDeclaration;
-    function isAccessor(node: Node): node is AccessorDeclaration;
-    function isTypeElement(node: Node): node is TypeElement;
-    function isClassOrTypeElement(node: Node): node is ClassElement | TypeElement;
-    function isObjectLiteralElementLike(node: Node): node is ObjectLiteralElementLike;
-    /**
-     * Node test that determines whether a node is a valid type node.
-     * This differs from the `isPartOfTypeNode` function which determines whether a node is *part*
-     * of a TypeNode.
-     */
-    function isTypeNode(node: Node): node is TypeNode;
-    function isFunctionOrConstructorTypeNode(node: Node): node is FunctionTypeNode | ConstructorTypeNode;
-    function isPropertyAccessOrQualifiedName(node: Node): node is PropertyAccessExpression | QualifiedName;
-    function isCallLikeExpression(node: Node): node is CallLikeExpression;
-    function isCallOrNewExpression(node: Node): node is CallExpression | NewExpression;
-    function isTemplateLiteral(node: Node): node is TemplateLiteral;
-    function isAssertionExpression(node: Node): node is AssertionExpression;
-    function isIterationStatement(node: Node, lookInLabeledStatements: false): node is IterationStatement;
-    function isIterationStatement(node: Node, lookInLabeledStatements: boolean): node is IterationStatement | LabeledStatement;
-    function isJsxOpeningLikeElement(node: Node): node is JsxOpeningLikeElement;
-    function isCaseOrDefaultClause(node: Node): node is CaseOrDefaultClause;
-    /** True if node is of a kind that may contain comment text. */
-    function isJSDocCommentContainingNode(node: Node): boolean;
-    function isSetAccessor(node: Node): node is SetAccessorDeclaration;
-    function isGetAccessor(node: Node): node is GetAccessorDeclaration;
-    function isObjectLiteralElement(node: Node): node is ObjectLiteralElement;
-    function isStringLiteralLike(node: Node): node is StringLiteralLike;
-}
-declare namespace ts {
-    function createNode(kind: SyntaxKind, pos?: number, end?: number): Node;
-    /**
-     * Invokes a callback for each child of the given node. The 'cbNode' callback is invoked for all child nodes
-     * stored in properties. If a 'cbNodes' callback is specified, it is invoked for embedded arrays; otherwise,
-     * embedded arrays are flattened and the 'cbNode' callback is invoked for each element. If a callback returns
-     * a truthy value, iteration stops and that value is returned. Otherwise, undefined is returned.
-     *
-     * @param node a given node to visit its children
-     * @param cbNode a callback to be invoked for all child nodes
-     * @param cbNodes a callback to be invoked for embedded array
-     *
-     * @remarks `forEachChild` must visit the children of a node in the order
-     * that they appear in the source code. The language service depends on this property to locate nodes by position.
-     */
-    function forEachChild<T>(node: Node, cbNode: (node: Node) => T | undefined, cbNodes?: (nodes: NodeArray<Node>) => T | undefined): T | undefined;
-    function createSourceFile(fileName: string, sourceText: string, languageVersion: ScriptTarget, setParentNodes?: boolean, scriptKind?: ScriptKind): SourceFile;
-    function parseIsolatedEntityName(text: string, languageVersion: ScriptTarget): EntityName | undefined;
-    /**
-     * Parse json text into SyntaxTree and return node and parse errors if any
-     * @param fileName
-     * @param sourceText
-     */
-    function parseJsonText(fileName: string, sourceText: string): JsonSourceFile;
-    function isExternalModule(file: SourceFile): boolean;
-    function updateSourceFile(sourceFile: SourceFile, newText: string, textChangeRange: TextChangeRange, aggressiveChecks?: boolean): SourceFile;
-}
-declare namespace ts {
-    function getEffectiveTypeRoots(options: CompilerOptions, host: GetEffectiveTypeRootsHost): string[] | undefined;
-    /**
-     * @param {string | undefined} containingFile - file that contains type reference directive, can be undefined if containing file is unknown.
-     * This is possible in case if resolution is performed for directives specified via 'types' parameter. In this case initial path for secondary lookups
-     * is assumed to be the same as root directory of the project.
-     */
-    function resolveTypeReferenceDirective(typeReferenceDirectiveName: string, containingFile: string | undefined, options: CompilerOptions, host: ModuleResolutionHost): ResolvedTypeReferenceDirectiveWithFailedLookupLocations;
-    /**
-     * Given a set of options, returns the set of type directive names
-     *   that should be included for this program automatically.
-     * This list could either come from the config file,
-     *   or from enumerating the types root + initial secondary types lookup location.
-     * More type directives might appear in the program later as a result of loading actual source files;
-     *   this list is only the set of defaults that are implicitly included.
-     */
-    function getAutomaticTypeDirectiveNames(options: CompilerOptions, host: ModuleResolutionHost): string[];
-    /**
-     * Cached module resolutions per containing directory.
-     * This assumes that any module id will have the same resolution for sibling files located in the same folder.
-     */
-    interface ModuleResolutionCache extends NonRelativeModuleNameResolutionCache {
-        getOrCreateCacheForDirectory(directoryName: string): Map<ResolvedModuleWithFailedLookupLocations>;
-    }
-    /**
-     * Stored map from non-relative module name to a table: directory -> result of module lookup in this directory
-     * We support only non-relative module names because resolution of relative module names is usually more deterministic and thus less expensive.
-     */
-    interface NonRelativeModuleNameResolutionCache {
-        getOrCreateCacheForModuleName(nonRelativeModuleName: string): PerModuleNameCache;
-    }
-    interface PerModuleNameCache {
-        get(directory: string): ResolvedModuleWithFailedLookupLocations | undefined;
-        set(directory: string, result: ResolvedModuleWithFailedLookupLocations): void;
-    }
-    function createModuleResolutionCache(currentDirectory: string, getCanonicalFileName: (s: string) => string): ModuleResolutionCache;
-    function resolveModuleNameFromCache(moduleName: string, containingFile: string, cache: ModuleResolutionCache): ResolvedModuleWithFailedLookupLocations | undefined;
-    function resolveModuleName(moduleName: string, containingFile: string, compilerOptions: CompilerOptions, host: ModuleResolutionHost, cache?: ModuleResolutionCache): ResolvedModuleWithFailedLookupLocations;
-    function nodeModuleNameResolver(moduleName: string, containingFile: string, compilerOptions: CompilerOptions, host: ModuleResolutionHost, cache?: ModuleResolutionCache): ResolvedModuleWithFailedLookupLocations;
-    function classicNameResolver(moduleName: string, containingFile: string, compilerOptions: CompilerOptions, host: ModuleResolutionHost, cache?: NonRelativeModuleNameResolutionCache): ResolvedModuleWithFailedLookupLocations;
-}
-declare namespace ts {
-    function createNodeArray<T extends Node>(elements?: ReadonlyArray<T>, hasTrailingComma?: boolean): NodeArray<T>;
-    /** If a node is passed, creates a string literal whose source text is read from a source node during emit. */
-    function createLiteral(value: string | StringLiteral | NoSubstitutionTemplateLiteral | NumericLiteral | Identifier): StringLiteral;
-    function createLiteral(value: number): NumericLiteral;
-    function createLiteral(value: boolean): BooleanLiteral;
-    function createLiteral(value: string | number | boolean): PrimaryExpression;
-    function createNumericLiteral(value: string): NumericLiteral;
-    function createStringLiteral(text: string): StringLiteral;
-    function createRegularExpressionLiteral(text: string): RegularExpressionLiteral;
-    function createIdentifier(text: string): Identifier;
-    function updateIdentifier(node: Identifier): Identifier;
-    /** Create a unique temporary variable. */
-    function createTempVariable(recordTempVariable: ((node: Identifier) => void) | undefined): Identifier;
-    /** Create a unique temporary variable for use in a loop. */
-    function createLoopVariable(): Identifier;
-    /** Create a unique name based on the supplied text. */
-    function createUniqueName(text: string): Identifier;
-    /** Create a unique name based on the supplied text. */
-    function createOptimisticUniqueName(text: string): Identifier;
-    /** Create a unique name based on the supplied text. This does not consider names injected by the transformer. */
-    function createFileLevelUniqueName(text: string): Identifier;
-    /** Create a unique name generated for a node. */
-    function getGeneratedNameForNode(node: Node): Identifier;
-    function createToken<TKind extends SyntaxKind>(token: TKind): Token<TKind>;
-    function createSuper(): SuperExpression;
-    function createThis(): ThisExpression & Token<SyntaxKind.ThisKeyword>;
-    function createNull(): NullLiteral & Token<SyntaxKind.NullKeyword>;
-    function createTrue(): BooleanLiteral & Token<SyntaxKind.TrueKeyword>;
-    function createFalse(): BooleanLiteral & Token<SyntaxKind.FalseKeyword>;
-    function createModifier<T extends Modifier["kind"]>(kind: T): Token<T>;
-    function createModifiersFromModifierFlags(flags: ModifierFlags): Modifier[];
-    function createQualifiedName(left: EntityName, right: string | Identifier): QualifiedName;
-    function updateQualifiedName(node: QualifiedName, left: EntityName, right: Identifier): QualifiedName;
-    function createComputedPropertyName(expression: Expression): ComputedPropertyName;
-    function updateComputedPropertyName(node: ComputedPropertyName, expression: Expression): ComputedPropertyName;
-    function createTypeParameterDeclaration(name: string | Identifier, constraint?: TypeNode, defaultType?: TypeNode): TypeParameterDeclaration;
-    function updateTypeParameterDeclaration(node: TypeParameterDeclaration, name: Identifier, constraint: TypeNode | undefined, defaultType: TypeNode | undefined): TypeParameterDeclaration;
-    function createParameter(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, dotDotDotToken: DotDotDotToken | undefined, name: string | BindingName, questionToken?: QuestionToken, type?: TypeNode, initializer?: Expression): ParameterDeclaration;
-    function updateParameter(node: ParameterDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, dotDotDotToken: DotDotDotToken | undefined, name: string | BindingName, questionToken: QuestionToken | undefined, type: TypeNode | undefined, initializer: Expression | undefined): ParameterDeclaration;
-    function createDecorator(expression: Expression): Decorator;
-    function updateDecorator(node: Decorator, expression: Expression): Decorator;
-    function createPropertySignature(modifiers: ReadonlyArray<Modifier> | undefined, name: PropertyName | string, questionToken: QuestionToken | undefined, type: TypeNode | undefined, initializer: Expression | undefined): PropertySignature;
-    function updatePropertySignature(node: PropertySignature, modifiers: ReadonlyArray<Modifier> | undefined, name: PropertyName, questionToken: QuestionToken | undefined, type: TypeNode | undefined, initializer: Expression | undefined): PropertySignature;
-    function createProperty(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | PropertyName, questionOrExclamationToken: QuestionToken | ExclamationToken | undefined, type: TypeNode | undefined, initializer: Expression | undefined): PropertyDeclaration;
-    function updateProperty(node: PropertyDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | PropertyName, questionOrExclamationToken: QuestionToken | ExclamationToken | undefined, type: TypeNode | undefined, initializer: Expression | undefined): PropertyDeclaration;
-    function createMethodSignature(typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, name: string | PropertyName, questionToken: QuestionToken | undefined): MethodSignature;
-    function updateMethodSignature(node: MethodSignature, typeParameters: NodeArray<TypeParameterDeclaration> | undefined, parameters: NodeArray<ParameterDeclaration>, type: TypeNode | undefined, name: PropertyName, questionToken: QuestionToken | undefined): MethodSignature;
-    function createMethod(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, asteriskToken: AsteriskToken | undefined, name: string | PropertyName, questionToken: QuestionToken | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, body: Block | undefined): MethodDeclaration;
-    function updateMethod(node: MethodDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, asteriskToken: AsteriskToken | undefined, name: PropertyName, questionToken: QuestionToken | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, body: Block | undefined): MethodDeclaration;
-    function createConstructor(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, body: Block | undefined): ConstructorDeclaration;
-    function updateConstructor(node: ConstructorDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, body: Block | undefined): ConstructorDeclaration;
-    function createGetAccessor(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | PropertyName, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, body: Block | undefined): GetAccessorDeclaration;
-    function updateGetAccessor(node: GetAccessorDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: PropertyName, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, body: Block | undefined): GetAccessorDeclaration;
-    function createSetAccessor(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | PropertyName, parameters: ReadonlyArray<ParameterDeclaration>, body: Block | undefined): SetAccessorDeclaration;
-    function updateSetAccessor(node: SetAccessorDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: PropertyName, parameters: ReadonlyArray<ParameterDeclaration>, body: Block | undefined): SetAccessorDeclaration;
-    function createCallSignature(typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined): CallSignatureDeclaration;
-    function updateCallSignature(node: CallSignatureDeclaration, typeParameters: NodeArray<TypeParameterDeclaration> | undefined, parameters: NodeArray<ParameterDeclaration>, type: TypeNode | undefined): CallSignatureDeclaration;
-    function createConstructSignature(typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined): ConstructSignatureDeclaration;
-    function updateConstructSignature(node: ConstructSignatureDeclaration, typeParameters: NodeArray<TypeParameterDeclaration> | undefined, parameters: NodeArray<ParameterDeclaration>, type: TypeNode | undefined): ConstructSignatureDeclaration;
-    function createIndexSignature(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode): IndexSignatureDeclaration;
-    function updateIndexSignature(node: IndexSignatureDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode): IndexSignatureDeclaration;
-    function createKeywordTypeNode(kind: KeywordTypeNode["kind"]): KeywordTypeNode;
-    function createTypePredicateNode(parameterName: Identifier | ThisTypeNode | string, type: TypeNode): TypePredicateNode;
-    function updateTypePredicateNode(node: TypePredicateNode, parameterName: Identifier | ThisTypeNode, type: TypeNode): TypePredicateNode;
-    function createTypeReferenceNode(typeName: string | EntityName, typeArguments: ReadonlyArray<TypeNode> | undefined): TypeReferenceNode;
-    function updateTypeReferenceNode(node: TypeReferenceNode, typeName: EntityName, typeArguments: NodeArray<TypeNode> | undefined): TypeReferenceNode;
-    function createFunctionTypeNode(typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined): FunctionTypeNode;
-    function updateFunctionTypeNode(node: FunctionTypeNode, typeParameters: NodeArray<TypeParameterDeclaration> | undefined, parameters: NodeArray<ParameterDeclaration>, type: TypeNode | undefined): FunctionTypeNode;
-    function createConstructorTypeNode(typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined): ConstructorTypeNode;
-    function updateConstructorTypeNode(node: ConstructorTypeNode, typeParameters: NodeArray<TypeParameterDeclaration> | undefined, parameters: NodeArray<ParameterDeclaration>, type: TypeNode | undefined): ConstructorTypeNode;
-    function createTypeQueryNode(exprName: EntityName): TypeQueryNode;
-    function updateTypeQueryNode(node: TypeQueryNode, exprName: EntityName): TypeQueryNode;
-    function createTypeLiteralNode(members: ReadonlyArray<TypeElement> | undefined): TypeLiteralNode;
-    function updateTypeLiteralNode(node: TypeLiteralNode, members: NodeArray<TypeElement>): TypeLiteralNode;
-    function createArrayTypeNode(elementType: TypeNode): ArrayTypeNode;
-    function updateArrayTypeNode(node: ArrayTypeNode, elementType: TypeNode): ArrayTypeNode;
-    function createTupleTypeNode(elementTypes: ReadonlyArray<TypeNode>): TupleTypeNode;
-    function updateTypleTypeNode(node: TupleTypeNode, elementTypes: ReadonlyArray<TypeNode>): TupleTypeNode;
-    function createUnionTypeNode(types: ReadonlyArray<TypeNode>): UnionTypeNode;
-    function updateUnionTypeNode(node: UnionTypeNode, types: NodeArray<TypeNode>): UnionTypeNode;
-    function createIntersectionTypeNode(types: ReadonlyArray<TypeNode>): IntersectionTypeNode;
-    function updateIntersectionTypeNode(node: IntersectionTypeNode, types: NodeArray<TypeNode>): IntersectionTypeNode;
-    function createUnionOrIntersectionTypeNode(kind: SyntaxKind.UnionType | SyntaxKind.IntersectionType, types: ReadonlyArray<TypeNode>): UnionOrIntersectionTypeNode;
-    function createConditionalTypeNode(checkType: TypeNode, extendsType: TypeNode, trueType: TypeNode, falseType: TypeNode): ConditionalTypeNode;
-    function updateConditionalTypeNode(node: ConditionalTypeNode, checkType: TypeNode, extendsType: TypeNode, trueType: TypeNode, falseType: TypeNode): ConditionalTypeNode;
-    function createInferTypeNode(typeParameter: TypeParameterDeclaration): InferTypeNode;
-    function updateInferTypeNode(node: InferTypeNode, typeParameter: TypeParameterDeclaration): InferTypeNode;
-    function createImportTypeNode(argument: TypeNode, qualifier?: EntityName, typeArguments?: ReadonlyArray<TypeNode>, isTypeOf?: boolean): ImportTypeNode;
-    function updateImportTypeNode(node: ImportTypeNode, argument: TypeNode, qualifier?: EntityName, typeArguments?: ReadonlyArray<TypeNode>, isTypeOf?: boolean): ImportTypeNode;
-    function createParenthesizedType(type: TypeNode): ParenthesizedTypeNode;
-    function updateParenthesizedType(node: ParenthesizedTypeNode, type: TypeNode): ParenthesizedTypeNode;
-    function createThisTypeNode(): ThisTypeNode;
-    function createTypeOperatorNode(type: TypeNode): TypeOperatorNode;
-    function createTypeOperatorNode(operator: SyntaxKind.KeyOfKeyword | SyntaxKind.UniqueKeyword, type: TypeNode): TypeOperatorNode;
-    function updateTypeOperatorNode(node: TypeOperatorNode, type: TypeNode): TypeOperatorNode;
-    function createIndexedAccessTypeNode(objectType: TypeNode, indexType: TypeNode): IndexedAccessTypeNode;
-    function updateIndexedAccessTypeNode(node: IndexedAccessTypeNode, objectType: TypeNode, indexType: TypeNode): IndexedAccessTypeNode;
-    function createMappedTypeNode(readonlyToken: ReadonlyToken | PlusToken | MinusToken | undefined, typeParameter: TypeParameterDeclaration, questionToken: QuestionToken | PlusToken | MinusToken | undefined, type: TypeNode | undefined): MappedTypeNode;
-    function updateMappedTypeNode(node: MappedTypeNode, readonlyToken: ReadonlyToken | PlusToken | MinusToken | undefined, typeParameter: TypeParameterDeclaration, questionToken: QuestionToken | PlusToken | MinusToken | undefined, type: TypeNode | undefined): MappedTypeNode;
-    function createLiteralTypeNode(literal: LiteralTypeNode["literal"]): LiteralTypeNode;
-    function updateLiteralTypeNode(node: LiteralTypeNode, literal: LiteralTypeNode["literal"]): LiteralTypeNode;
-    function createObjectBindingPattern(elements: ReadonlyArray<BindingElement>): ObjectBindingPattern;
-    function updateObjectBindingPattern(node: ObjectBindingPattern, elements: ReadonlyArray<BindingElement>): ObjectBindingPattern;
-    function createArrayBindingPattern(elements: ReadonlyArray<ArrayBindingElement>): ArrayBindingPattern;
-    function updateArrayBindingPattern(node: ArrayBindingPattern, elements: ReadonlyArray<ArrayBindingElement>): ArrayBindingPattern;
-    function createBindingElement(dotDotDotToken: DotDotDotToken | undefined, propertyName: string | PropertyName | undefined, name: string | BindingName, initializer?: Expression): BindingElement;
-    function updateBindingElement(node: BindingElement, dotDotDotToken: DotDotDotToken | undefined, propertyName: PropertyName | undefined, name: BindingName, initializer: Expression | undefined): BindingElement;
-    function createArrayLiteral(elements?: ReadonlyArray<Expression>, multiLine?: boolean): ArrayLiteralExpression;
-    function updateArrayLiteral(node: ArrayLiteralExpression, elements: ReadonlyArray<Expression>): ArrayLiteralExpression;
-    function createObjectLiteral(properties?: ReadonlyArray<ObjectLiteralElementLike>, multiLine?: boolean): ObjectLiteralExpression;
-    function updateObjectLiteral(node: ObjectLiteralExpression, properties: ReadonlyArray<ObjectLiteralElementLike>): ObjectLiteralExpression;
-    function createPropertyAccess(expression: Expression, name: string | Identifier | undefined): PropertyAccessExpression;
-    function updatePropertyAccess(node: PropertyAccessExpression, expression: Expression, name: Identifier): PropertyAccessExpression;
-    function createElementAccess(expression: Expression, index: number | Expression): ElementAccessExpression;
-    function updateElementAccess(node: ElementAccessExpression, expression: Expression, argumentExpression: Expression): ElementAccessExpression;
-    function createCall(expression: Expression, typeArguments: ReadonlyArray<TypeNode> | undefined, argumentsArray: ReadonlyArray<Expression> | undefined): CallExpression;
-    function updateCall(node: CallExpression, expression: Expression, typeArguments: ReadonlyArray<TypeNode> | undefined, argumentsArray: ReadonlyArray<Expression>): CallExpression;
-    function createNew(expression: Expression, typeArguments: ReadonlyArray<TypeNode> | undefined, argumentsArray: ReadonlyArray<Expression> | undefined): NewExpression;
-    function updateNew(node: NewExpression, expression: Expression, typeArguments: ReadonlyArray<TypeNode> | undefined, argumentsArray: ReadonlyArray<Expression> | undefined): NewExpression;
-    function createTaggedTemplate(tag: Expression, template: TemplateLiteral): TaggedTemplateExpression;
-    function createTaggedTemplate(tag: Expression, typeArguments: ReadonlyArray<TypeNode> | undefined, template: TemplateLiteral): TaggedTemplateExpression;
-    function updateTaggedTemplate(node: TaggedTemplateExpression, tag: Expression, template: TemplateLiteral): TaggedTemplateExpression;
-    function updateTaggedTemplate(node: TaggedTemplateExpression, tag: Expression, typeArguments: ReadonlyArray<TypeNode> | undefined, template: TemplateLiteral): TaggedTemplateExpression;
-    function createTypeAssertion(type: TypeNode, expression: Expression): TypeAssertion;
-    function updateTypeAssertion(node: TypeAssertion, type: TypeNode, expression: Expression): TypeAssertion;
-    function createParen(expression: Expression): ParenthesizedExpression;
-    function updateParen(node: ParenthesizedExpression, expression: Expression): ParenthesizedExpression;
-    function createFunctionExpression(modifiers: ReadonlyArray<Modifier> | undefined, asteriskToken: AsteriskToken | undefined, name: string | Identifier | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration> | undefined, type: TypeNode | undefined, body: Block): FunctionExpression;
-    function updateFunctionExpression(node: FunctionExpression, modifiers: ReadonlyArray<Modifier> | undefined, asteriskToken: AsteriskToken | undefined, name: Identifier | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, body: Block): FunctionExpression;
-    function createArrowFunction(modifiers: ReadonlyArray<Modifier> | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, equalsGreaterThanToken: EqualsGreaterThanToken | undefined, body: ConciseBody): ArrowFunction;
-    function updateArrowFunction(node: ArrowFunction, modifiers: ReadonlyArray<Modifier> | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, body: ConciseBody): ArrowFunction;
-    function updateArrowFunction(node: ArrowFunction, modifiers: ReadonlyArray<Modifier> | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, equalsGreaterThanToken: Token<SyntaxKind.EqualsGreaterThanToken>, body: ConciseBody): ArrowFunction;
-    function createDelete(expression: Expression): DeleteExpression;
-    function updateDelete(node: DeleteExpression, expression: Expression): DeleteExpression;
-    function createTypeOf(expression: Expression): TypeOfExpression;
-    function updateTypeOf(node: TypeOfExpression, expression: Expression): TypeOfExpression;
-    function createVoid(expression: Expression): VoidExpression;
-    function updateVoid(node: VoidExpression, expression: Expression): VoidExpression;
-    function createAwait(expression: Expression): AwaitExpression;
-    function updateAwait(node: AwaitExpression, expression: Expression): AwaitExpression;
-    function createPrefix(operator: PrefixUnaryOperator, operand: Expression): PrefixUnaryExpression;
-    function updatePrefix(node: PrefixUnaryExpression, operand: Expression): PrefixUnaryExpression;
-    function createPostfix(operand: Expression, operator: PostfixUnaryOperator): PostfixUnaryExpression;
-    function updatePostfix(node: PostfixUnaryExpression, operand: Expression): PostfixUnaryExpression;
-    function createBinary(left: Expression, operator: BinaryOperator | BinaryOperatorToken, right: Expression): BinaryExpression;
-    function updateBinary(node: BinaryExpression, left: Expression, right: Expression, operator?: BinaryOperator | BinaryOperatorToken): BinaryExpression;
-    function createConditional(condition: Expression, whenTrue: Expression, whenFalse: Expression): ConditionalExpression;
-    function createConditional(condition: Expression, questionToken: QuestionToken, whenTrue: Expression, colonToken: ColonToken, whenFalse: Expression): ConditionalExpression;
-    function updateConditional(node: ConditionalExpression, condition: Expression, whenTrue: Expression, whenFalse: Expression): ConditionalExpression;
-    function updateConditional(node: ConditionalExpression, condition: Expression, questionToken: Token<SyntaxKind.QuestionToken>, whenTrue: Expression, colonToken: Token<SyntaxKind.ColonToken>, whenFalse: Expression): ConditionalExpression;
-    function createTemplateExpression(head: TemplateHead, templateSpans: ReadonlyArray<TemplateSpan>): TemplateExpression;
-    function updateTemplateExpression(node: TemplateExpression, head: TemplateHead, templateSpans: ReadonlyArray<TemplateSpan>): TemplateExpression;
-    function createTemplateHead(text: string): TemplateHead;
-    function createTemplateMiddle(text: string): TemplateMiddle;
-    function createTemplateTail(text: string): TemplateTail;
-    function createNoSubstitutionTemplateLiteral(text: string): NoSubstitutionTemplateLiteral;
-    function createYield(expression?: Expression): YieldExpression;
-    function createYield(asteriskToken: AsteriskToken | undefined, expression: Expression): YieldExpression;
-    function updateYield(node: YieldExpression, asteriskToken: AsteriskToken | undefined, expression: Expression): YieldExpression;
-    function createSpread(expression: Expression): SpreadElement;
-    function updateSpread(node: SpreadElement, expression: Expression): SpreadElement;
-    function createClassExpression(modifiers: ReadonlyArray<Modifier> | undefined, name: string | Identifier | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, heritageClauses: ReadonlyArray<HeritageClause> | undefined, members: ReadonlyArray<ClassElement>): ClassExpression;
-    function updateClassExpression(node: ClassExpression, modifiers: ReadonlyArray<Modifier> | undefined, name: Identifier | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, heritageClauses: ReadonlyArray<HeritageClause> | undefined, members: ReadonlyArray<ClassElement>): ClassExpression;
-    function createOmittedExpression(): OmittedExpression;
-    function createExpressionWithTypeArguments(typeArguments: ReadonlyArray<TypeNode> | undefined, expression: Expression): ExpressionWithTypeArguments;
-    function updateExpressionWithTypeArguments(node: ExpressionWithTypeArguments, typeArguments: ReadonlyArray<TypeNode> | undefined, expression: Expression): ExpressionWithTypeArguments;
-    function createAsExpression(expression: Expression, type: TypeNode): AsExpression;
-    function updateAsExpression(node: AsExpression, expression: Expression, type: TypeNode): AsExpression;
-    function createNonNullExpression(expression: Expression): NonNullExpression;
-    function updateNonNullExpression(node: NonNullExpression, expression: Expression): NonNullExpression;
-    function createMetaProperty(keywordToken: MetaProperty["keywordToken"], name: Identifier): MetaProperty;
-    function updateMetaProperty(node: MetaProperty, name: Identifier): MetaProperty;
-    function createTemplateSpan(expression: Expression, literal: TemplateMiddle | TemplateTail): TemplateSpan;
-    function updateTemplateSpan(node: TemplateSpan, expression: Expression, literal: TemplateMiddle | TemplateTail): TemplateSpan;
-    function createSemicolonClassElement(): SemicolonClassElement;
-    function createBlock(statements: ReadonlyArray<Statement>, multiLine?: boolean): Block;
-    function updateBlock(node: Block, statements: ReadonlyArray<Statement>): Block;
-    function createVariableStatement(modifiers: ReadonlyArray<Modifier> | undefined, declarationList: VariableDeclarationList | ReadonlyArray<VariableDeclaration>): VariableStatement;
-    function updateVariableStatement(node: VariableStatement, modifiers: ReadonlyArray<Modifier> | undefined, declarationList: VariableDeclarationList): VariableStatement;
-    function createEmptyStatement(): EmptyStatement;
-    function createStatement(expression: Expression): ExpressionStatement;
-    function updateStatement(node: ExpressionStatement, expression: Expression): ExpressionStatement;
-    function createIf(expression: Expression, thenStatement: Statement, elseStatement?: Statement): IfStatement;
-    function updateIf(node: IfStatement, expression: Expression, thenStatement: Statement, elseStatement: Statement | undefined): IfStatement;
-    function createDo(statement: Statement, expression: Expression): DoStatement;
-    function updateDo(node: DoStatement, statement: Statement, expression: Expression): DoStatement;
-    function createWhile(expression: Expression, statement: Statement): WhileStatement;
-    function updateWhile(node: WhileStatement, expression: Expression, statement: Statement): WhileStatement;
-    function createFor(initializer: ForInitializer | undefined, condition: Expression | undefined, incrementor: Expression | undefined, statement: Statement): ForStatement;
-    function updateFor(node: ForStatement, initializer: ForInitializer | undefined, condition: Expression | undefined, incrementor: Expression | undefined, statement: Statement): ForStatement;
-    function createForIn(initializer: ForInitializer, expression: Expression, statement: Statement): ForInStatement;
-    function updateForIn(node: ForInStatement, initializer: ForInitializer, expression: Expression, statement: Statement): ForInStatement;
-    function createForOf(awaitModifier: AwaitKeywordToken | undefined, initializer: ForInitializer, expression: Expression, statement: Statement): ForOfStatement;
-    function updateForOf(node: ForOfStatement, awaitModifier: AwaitKeywordToken | undefined, initializer: ForInitializer, expression: Expression, statement: Statement): ForOfStatement;
-    function createContinue(label?: string | Identifier): ContinueStatement;
-    function updateContinue(node: ContinueStatement, label: Identifier | undefined): ContinueStatement;
-    function createBreak(label?: string | Identifier): BreakStatement;
-    function updateBreak(node: BreakStatement, label: Identifier | undefined): BreakStatement;
-    function createReturn(expression?: Expression): ReturnStatement;
-    function updateReturn(node: ReturnStatement, expression: Expression | undefined): ReturnStatement;
-    function createWith(expression: Expression, statement: Statement): WithStatement;
-    function updateWith(node: WithStatement, expression: Expression, statement: Statement): WithStatement;
-    function createSwitch(expression: Expression, caseBlock: CaseBlock): SwitchStatement;
-    function updateSwitch(node: SwitchStatement, expression: Expression, caseBlock: CaseBlock): SwitchStatement;
-    function createLabel(label: string | Identifier, statement: Statement): LabeledStatement;
-    function updateLabel(node: LabeledStatement, label: Identifier, statement: Statement): LabeledStatement;
-    function createThrow(expression: Expression): ThrowStatement;
-    function updateThrow(node: ThrowStatement, expression: Expression): ThrowStatement;
-    function createTry(tryBlock: Block, catchClause: CatchClause | undefined, finallyBlock: Block | undefined): TryStatement;
-    function updateTry(node: TryStatement, tryBlock: Block, catchClause: CatchClause | undefined, finallyBlock: Block | undefined): TryStatement;
-    function createDebuggerStatement(): DebuggerStatement;
-    function createVariableDeclaration(name: string | BindingName, type?: TypeNode, initializer?: Expression): VariableDeclaration;
-    function updateVariableDeclaration(node: VariableDeclaration, name: BindingName, type: TypeNode | undefined, initializer: Expression | undefined): VariableDeclaration;
-    function createVariableDeclarationList(declarations: ReadonlyArray<VariableDeclaration>, flags?: NodeFlags): VariableDeclarationList;
-    function updateVariableDeclarationList(node: VariableDeclarationList, declarations: ReadonlyArray<VariableDeclaration>): VariableDeclarationList;
-    function createFunctionDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, asteriskToken: AsteriskToken | undefined, name: string | Identifier | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, body: Block | undefined): FunctionDeclaration;
-    function updateFunctionDeclaration(node: FunctionDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, asteriskToken: AsteriskToken | undefined, name: Identifier | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, body: Block | undefined): FunctionDeclaration;
-    function createClassDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | Identifier | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, heritageClauses: ReadonlyArray<HeritageClause> | undefined, members: ReadonlyArray<ClassElement>): ClassDeclaration;
-    function updateClassDeclaration(node: ClassDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: Identifier | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, heritageClauses: ReadonlyArray<HeritageClause> | undefined, members: ReadonlyArray<ClassElement>): ClassDeclaration;
-    function createInterfaceDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | Identifier, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, heritageClauses: ReadonlyArray<HeritageClause> | undefined, members: ReadonlyArray<TypeElement>): InterfaceDeclaration;
-    function updateInterfaceDeclaration(node: InterfaceDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: Identifier, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, heritageClauses: ReadonlyArray<HeritageClause> | undefined, members: ReadonlyArray<TypeElement>): InterfaceDeclaration;
-    function createTypeAliasDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | Identifier, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, type: TypeNode): TypeAliasDeclaration;
-    function updateTypeAliasDeclaration(node: TypeAliasDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: Identifier, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, type: TypeNode): TypeAliasDeclaration;
-    function createEnumDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | Identifier, members: ReadonlyArray<EnumMember>): EnumDeclaration;
-    function updateEnumDeclaration(node: EnumDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: Identifier, members: ReadonlyArray<EnumMember>): EnumDeclaration;
-    function createModuleDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: ModuleName, body: ModuleBody | undefined, flags?: NodeFlags): ModuleDeclaration;
-    function updateModuleDeclaration(node: ModuleDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: ModuleName, body: ModuleBody | undefined): ModuleDeclaration;
-    function createModuleBlock(statements: ReadonlyArray<Statement>): ModuleBlock;
-    function updateModuleBlock(node: ModuleBlock, statements: ReadonlyArray<Statement>): ModuleBlock;
-    function createCaseBlock(clauses: ReadonlyArray<CaseOrDefaultClause>): CaseBlock;
-    function updateCaseBlock(node: CaseBlock, clauses: ReadonlyArray<CaseOrDefaultClause>): CaseBlock;
-    function createNamespaceExportDeclaration(name: string | Identifier): NamespaceExportDeclaration;
-    function updateNamespaceExportDeclaration(node: NamespaceExportDeclaration, name: Identifier): NamespaceExportDeclaration;
-    function createImportEqualsDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | Identifier, moduleReference: ModuleReference): ImportEqualsDeclaration;
-    function updateImportEqualsDeclaration(node: ImportEqualsDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: Identifier, moduleReference: ModuleReference): ImportEqualsDeclaration;
-    function createImportDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, importClause: ImportClause | undefined, moduleSpecifier: Expression): ImportDeclaration;
-    function updateImportDeclaration(node: ImportDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, importClause: ImportClause | undefined, moduleSpecifier: Expression): ImportDeclaration;
-    function createImportClause(name: Identifier | undefined, namedBindings: NamedImportBindings | undefined): ImportClause;
-    function updateImportClause(node: ImportClause, name: Identifier | undefined, namedBindings: NamedImportBindings | undefined): ImportClause;
-    function createNamespaceImport(name: Identifier): NamespaceImport;
-    function updateNamespaceImport(node: NamespaceImport, name: Identifier): NamespaceImport;
-    function createNamedImports(elements: ReadonlyArray<ImportSpecifier>): NamedImports;
-    function updateNamedImports(node: NamedImports, elements: ReadonlyArray<ImportSpecifier>): NamedImports;
-    function createImportSpecifier(propertyName: Identifier | undefined, name: Identifier): ImportSpecifier;
-    function updateImportSpecifier(node: ImportSpecifier, propertyName: Identifier | undefined, name: Identifier): ImportSpecifier;
-    function createExportAssignment(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, isExportEquals: boolean | undefined, expression: Expression): ExportAssignment;
-    function updateExportAssignment(node: ExportAssignment, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, expression: Expression): ExportAssignment;
-    function createExportDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, exportClause: NamedExports | undefined, moduleSpecifier?: Expression): ExportDeclaration;
-    function updateExportDeclaration(node: ExportDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, exportClause: NamedExports | undefined, moduleSpecifier: Expression | undefined): ExportDeclaration;
-    function createNamedExports(elements: ReadonlyArray<ExportSpecifier>): NamedExports;
-    function updateNamedExports(node: NamedExports, elements: ReadonlyArray<ExportSpecifier>): NamedExports;
-    function createExportSpecifier(propertyName: string | Identifier | undefined, name: string | Identifier): ExportSpecifier;
-    function updateExportSpecifier(node: ExportSpecifier, propertyName: Identifier | undefined, name: Identifier): ExportSpecifier;
-    function createExternalModuleReference(expression: Expression): ExternalModuleReference;
-    function updateExternalModuleReference(node: ExternalModuleReference, expression: Expression): ExternalModuleReference;
-    function createJsxElement(openingElement: JsxOpeningElement, children: ReadonlyArray<JsxChild>, closingElement: JsxClosingElement): JsxElement;
-    function updateJsxElement(node: JsxElement, openingElement: JsxOpeningElement, children: ReadonlyArray<JsxChild>, closingElement: JsxClosingElement): JsxElement;
-    function createJsxSelfClosingElement(tagName: JsxTagNameExpression, typeArguments: ReadonlyArray<TypeNode> | undefined, attributes: JsxAttributes): JsxSelfClosingElement;
-    function updateJsxSelfClosingElement(node: JsxSelfClosingElement, tagName: JsxTagNameExpression, typeArguments: ReadonlyArray<TypeNode> | undefined, attributes: JsxAttributes): JsxSelfClosingElement;
-    function createJsxOpeningElement(tagName: JsxTagNameExpression, typeArguments: ReadonlyArray<TypeNode> | undefined, attributes: JsxAttributes): JsxOpeningElement;
-    function updateJsxOpeningElement(node: JsxOpeningElement, tagName: JsxTagNameExpression, typeArguments: ReadonlyArray<TypeNode> | undefined, attributes: JsxAttributes): JsxOpeningElement;
-    function createJsxClosingElement(tagName: JsxTagNameExpression): JsxClosingElement;
-    function updateJsxClosingElement(node: JsxClosingElement, tagName: JsxTagNameExpression): JsxClosingElement;
-    function createJsxFragment(openingFragment: JsxOpeningFragment, children: ReadonlyArray<JsxChild>, closingFragment: JsxClosingFragment): JsxFragment;
-    function updateJsxFragment(node: JsxFragment, openingFragment: JsxOpeningFragment, children: ReadonlyArray<JsxChild>, closingFragment: JsxClosingFragment): JsxFragment;
-    function createJsxAttribute(name: Identifier, initializer: StringLiteral | JsxExpression): JsxAttribute;
-    function updateJsxAttribute(node: JsxAttribute, name: Identifier, initializer: StringLiteral | JsxExpression): JsxAttribute;
-    function createJsxAttributes(properties: ReadonlyArray<JsxAttributeLike>): JsxAttributes;
-    function updateJsxAttributes(node: JsxAttributes, properties: ReadonlyArray<JsxAttributeLike>): JsxAttributes;
-    function createJsxSpreadAttribute(expression: Expression): JsxSpreadAttribute;
-    function updateJsxSpreadAttribute(node: JsxSpreadAttribute, expression: Expression): JsxSpreadAttribute;
-    function createJsxExpression(dotDotDotToken: DotDotDotToken | undefined, expression: Expression | undefined): JsxExpression;
-    function updateJsxExpression(node: JsxExpression, expression: Expression | undefined): JsxExpression;
-    function createCaseClause(expression: Expression, statements: ReadonlyArray<Statement>): CaseClause;
-    function updateCaseClause(node: CaseClause, expression: Expression, statements: ReadonlyArray<Statement>): CaseClause;
-    function createDefaultClause(statements: ReadonlyArray<Statement>): DefaultClause;
-    function updateDefaultClause(node: DefaultClause, statements: ReadonlyArray<Statement>): DefaultClause;
-    function createHeritageClause(token: HeritageClause["token"], types: ReadonlyArray<ExpressionWithTypeArguments>): HeritageClause;
-    function updateHeritageClause(node: HeritageClause, types: ReadonlyArray<ExpressionWithTypeArguments>): HeritageClause;
-    function createCatchClause(variableDeclaration: string | VariableDeclaration | undefined, block: Block): CatchClause;
-    function updateCatchClause(node: CatchClause, variableDeclaration: VariableDeclaration | undefined, block: Block): CatchClause;
-    function createPropertyAssignment(name: string | PropertyName, initializer: Expression): PropertyAssignment;
-    function updatePropertyAssignment(node: PropertyAssignment, name: PropertyName, initializer: Expression): PropertyAssignment;
-    function createShorthandPropertyAssignment(name: string | Identifier, objectAssignmentInitializer?: Expression): ShorthandPropertyAssignment;
-    function updateShorthandPropertyAssignment(node: ShorthandPropertyAssignment, name: Identifier, objectAssignmentInitializer: Expression | undefined): ShorthandPropertyAssignment;
-    function createSpreadAssignment(expression: Expression): SpreadAssignment;
-    function updateSpreadAssignment(node: SpreadAssignment, expression: Expression): SpreadAssignment;
-    function createEnumMember(name: string | PropertyName, initializer?: Expression): EnumMember;
-    function updateEnumMember(node: EnumMember, name: PropertyName, initializer: Expression | undefined): EnumMember;
-    function updateSourceFileNode(node: SourceFile, statements: ReadonlyArray<Statement>, isDeclarationFile?: boolean, referencedFiles?: SourceFile["referencedFiles"], typeReferences?: SourceFile["typeReferenceDirectives"], hasNoDefaultLib?: boolean, libReferences?: SourceFile["libReferenceDirectives"]): SourceFile;
-    /**
-     * Creates a shallow, memberwise clone of a node for mutation.
-     */
-    function getMutableClone<T extends Node>(node: T): T;
-    /**
-     * Creates a synthetic statement to act as a placeholder for a not-emitted statement in
-     * order to preserve comments.
-     *
-     * @param original The original statement.
-     */
-    function createNotEmittedStatement(original: Node): NotEmittedStatement;
-    /**
-     * Creates a synthetic expression to act as a placeholder for a not-emitted expression in
-     * order to preserve comments or sourcemap positions.
-     *
-     * @param expression The inner expression to emit.
-     * @param original The original outer expression.
-     * @param location The location for the expression. Defaults to the positions from "original" if provided.
-     */
-    function createPartiallyEmittedExpression(expression: Expression, original?: Node): PartiallyEmittedExpression;
-    function updatePartiallyEmittedExpression(node: PartiallyEmittedExpression, expression: Expression): PartiallyEmittedExpression;
-    function createCommaList(elements: ReadonlyArray<Expression>): CommaListExpression;
-    function updateCommaList(node: CommaListExpression, elements: ReadonlyArray<Expression>): CommaListExpression;
-    function createBundle(sourceFiles: ReadonlyArray<SourceFile>, prepends?: ReadonlyArray<UnparsedSource | InputFiles>): Bundle;
-    function createUnparsedSourceFile(text: string, map?: string): UnparsedSource;
-    function createInputFiles(javascript: string, declaration: string, javascriptMapText?: string, declarationMapText?: string): InputFiles;
-    function updateBundle(node: Bundle, sourceFiles: ReadonlyArray<SourceFile>, prepends?: ReadonlyArray<UnparsedSource>): Bundle;
-    function createImmediatelyInvokedFunctionExpression(statements: ReadonlyArray<Statement>): CallExpression;
-    function createImmediatelyInvokedFunctionExpression(statements: ReadonlyArray<Statement>, param: ParameterDeclaration, paramValue: Expression): CallExpression;
-    function createImmediatelyInvokedArrowFunction(statements: ReadonlyArray<Statement>): CallExpression;
-    function createImmediatelyInvokedArrowFunction(statements: ReadonlyArray<Statement>, param: ParameterDeclaration, paramValue: Expression): CallExpression;
-    function createComma(left: Expression, right: Expression): Expression;
-    function createLessThan(left: Expression, right: Expression): Expression;
-    function createAssignment(left: ObjectLiteralExpression | ArrayLiteralExpression, right: Expression): DestructuringAssignment;
-    function createAssignment(left: Expression, right: Expression): BinaryExpression;
-    function createStrictEquality(left: Expression, right: Expression): BinaryExpression;
-    function createStrictInequality(left: Expression, right: Expression): BinaryExpression;
-    function createAdd(left: Expression, right: Expression): BinaryExpression;
-    function createSubtract(left: Expression, right: Expression): BinaryExpression;
-    function createPostfixIncrement(operand: Expression): PostfixUnaryExpression;
-    function createLogicalAnd(left: Expression, right: Expression): BinaryExpression;
-    function createLogicalOr(left: Expression, right: Expression): BinaryExpression;
-    function createLogicalNot(operand: Expression): PrefixUnaryExpression;
-    function createVoidZero(): VoidExpression;
-    function createExportDefault(expression: Expression): ExportAssignment;
-    function createExternalModuleExport(exportName: Identifier): ExportDeclaration;
-    /**
-     * Clears any EmitNode entries from parse-tree nodes.
-     * @param sourceFile A source file.
-     */
-    function disposeEmitNodes(sourceFile: SourceFile): void;
-    function setTextRange<T extends TextRange>(range: T, location: TextRange | undefined): T;
-    /**
-     * Sets flags that control emit behavior of a node.
-     */
-    function setEmitFlags<T extends Node>(node: T, emitFlags: EmitFlags): T;
-    /**
-     * Gets a custom text range to use when emitting source maps.
-     */
-    function getSourceMapRange(node: Node): SourceMapRange;
-    /**
-     * Sets a custom text range to use when emitting source maps.
-     */
-    function setSourceMapRange<T extends Node>(node: T, range: SourceMapRange | undefined): T;
-    /**
-     * Create an external source map source file reference
-     */
-    function createSourceMapSource(fileName: string, text: string, skipTrivia?: (pos: number) => number): SourceMapSource;
-    /**
-     * Gets the TextRange to use for source maps for a token of a node.
-     */
-    function getTokenSourceMapRange(node: Node, token: SyntaxKind): SourceMapRange | undefined;
-    /**
-     * Sets the TextRange to use for source maps for a token of a node.
-     */
-    function setTokenSourceMapRange<T extends Node>(node: T, token: SyntaxKind, range: SourceMapRange | undefined): T;
-    /**
-     * Gets a custom text range to use when emitting comments.
-     */
-    function getCommentRange(node: Node): TextRange;
-    /**
-     * Sets a custom text range to use when emitting comments.
-     */
-    function setCommentRange<T extends Node>(node: T, range: TextRange): T;
-    function getSyntheticLeadingComments(node: Node): SynthesizedComment[] | undefined;
-    function setSyntheticLeadingComments<T extends Node>(node: T, comments: SynthesizedComment[] | undefined): T;
-    function addSyntheticLeadingComment<T extends Node>(node: T, kind: SyntaxKind.SingleLineCommentTrivia | SyntaxKind.MultiLineCommentTrivia, text: string, hasTrailingNewLine?: boolean): T;
-    function getSyntheticTrailingComments(node: Node): SynthesizedComment[] | undefined;
-    function setSyntheticTrailingComments<T extends Node>(node: T, comments: SynthesizedComment[] | undefined): T;
-    function addSyntheticTrailingComment<T extends Node>(node: T, kind: SyntaxKind.SingleLineCommentTrivia | SyntaxKind.MultiLineCommentTrivia, text: string, hasTrailingNewLine?: boolean): T;
-    function moveSyntheticComments<T extends Node>(node: T, original: Node): T;
-    /**
-     * Gets the constant value to emit for an expression.
-     */
-    function getConstantValue(node: PropertyAccessExpression | ElementAccessExpression): string | number | undefined;
-    /**
-     * Sets the constant value to emit for an expression.
-     */
-    function setConstantValue(node: PropertyAccessExpression | ElementAccessExpression, value: string | number): PropertyAccessExpression | ElementAccessExpression;
-    /**
-     * Adds an EmitHelper to a node.
-     */
-    function addEmitHelper<T extends Node>(node: T, helper: EmitHelper): T;
-    /**
-     * Add EmitHelpers to a node.
-     */
-    function addEmitHelpers<T extends Node>(node: T, helpers: EmitHelper[] | undefined): T;
-    /**
-     * Removes an EmitHelper from a node.
-     */
-    function removeEmitHelper(node: Node, helper: EmitHelper): boolean;
-    /**
-     * Gets the EmitHelpers of a node.
-     */
-    function getEmitHelpers(node: Node): EmitHelper[] | undefined;
-    /**
-     * Moves matching emit helpers from a source node to a target node.
-     */
-    function moveEmitHelpers(source: Node, target: Node, predicate: (helper: EmitHelper) => boolean): void;
-    function setOriginalNode<T extends Node>(node: T, original: Node | undefined): T;
-}
-declare namespace ts {
-    /**
-     * Visits a Node using the supplied visitor, possibly returning a new Node in its place.
-     *
-     * @param node The Node to visit.
-     * @param visitor The callback used to visit the Node.
-     * @param test A callback to execute to verify the Node is valid.
-     * @param lift An optional callback to execute to lift a NodeArray into a valid Node.
-     */
-    function visitNode<T extends Node>(node: T | undefined, visitor: Visitor | undefined, test?: (node: Node) => boolean, lift?: (node: NodeArray<Node>) => T): T;
-    /**
-     * Visits a Node using the supplied visitor, possibly returning a new Node in its place.
-     *
-     * @param node The Node to visit.
-     * @param visitor The callback used to visit the Node.
-     * @param test A callback to execute to verify the Node is valid.
-     * @param lift An optional callback to execute to lift a NodeArray into a valid Node.
-     */
-    function visitNode<T extends Node>(node: T | undefined, visitor: Visitor | undefined, test?: (node: Node) => boolean, lift?: (node: NodeArray<Node>) => T): T | undefined;
-    /**
-     * Visits a NodeArray using the supplied visitor, possibly returning a new NodeArray in its place.
-     *
-     * @param nodes The NodeArray to visit.
-     * @param visitor The callback used to visit a Node.
-     * @param test A node test to execute for each node.
-     * @param start An optional value indicating the starting offset at which to start visiting.
-     * @param count An optional value indicating the maximum number of nodes to visit.
-     */
-    function visitNodes<T extends Node>(nodes: NodeArray<T> | undefined, visitor: Visitor, test?: (node: Node) => boolean, start?: number, count?: number): NodeArray<T>;
-    /**
-     * Visits a NodeArray using the supplied visitor, possibly returning a new NodeArray in its place.
-     *
-     * @param nodes The NodeArray to visit.
-     * @param visitor The callback used to visit a Node.
-     * @param test A node test to execute for each node.
-     * @param start An optional value indicating the starting offset at which to start visiting.
-     * @param count An optional value indicating the maximum number of nodes to visit.
-     */
-    function visitNodes<T extends Node>(nodes: NodeArray<T> | undefined, visitor: Visitor, test?: (node: Node) => boolean, start?: number, count?: number): NodeArray<T> | undefined;
-    /**
-     * Starts a new lexical environment and visits a statement list, ending the lexical environment
-     * and merging hoisted declarations upon completion.
-     */
-    function visitLexicalEnvironment(statements: NodeArray<Statement>, visitor: Visitor, context: TransformationContext, start?: number, ensureUseStrict?: boolean): NodeArray<Statement>;
-    /**
-     * Starts a new lexical environment and visits a parameter list, suspending the lexical
-     * environment upon completion.
-     */
-    function visitParameterList(nodes: NodeArray<ParameterDeclaration> | undefined, visitor: Visitor, context: TransformationContext, nodesVisitor?: typeof visitNodes): NodeArray<ParameterDeclaration>;
-    /**
-     * Resumes a suspended lexical environment and visits a function body, ending the lexical
-     * environment and merging hoisted declarations upon completion.
-     */
-    function visitFunctionBody(node: FunctionBody, visitor: Visitor, context: TransformationContext): FunctionBody;
-    /**
-     * Resumes a suspended lexical environment and visits a function body, ending the lexical
-     * environment and merging hoisted declarations upon completion.
-     */
-    function visitFunctionBody(node: FunctionBody | undefined, visitor: Visitor, context: TransformationContext): FunctionBody | undefined;
-    /**
-     * Resumes a suspended lexical environment and visits a concise body, ending the lexical
-     * environment and merging hoisted declarations upon completion.
-     */
-    function visitFunctionBody(node: ConciseBody, visitor: Visitor, context: TransformationContext): ConciseBody;
-    /**
-     * Visits each child of a Node using the supplied visitor, possibly returning a new Node of the same kind in its place.
-     *
-     * @param node The Node whose children will be visited.
-     * @param visitor The callback used to visit each child.
-     * @param context A lexical environment context for the visitor.
-     */
-    function visitEachChild<T extends Node>(node: T, visitor: Visitor, context: TransformationContext): T;
-    /**
-     * Visits each child of a Node using the supplied visitor, possibly returning a new Node of the same kind in its place.
-     *
-     * @param node The Node whose children will be visited.
-     * @param visitor The callback used to visit each child.
-     * @param context A lexical environment context for the visitor.
-     */
-    function visitEachChild<T extends Node>(node: T | undefined, visitor: Visitor, context: TransformationContext, nodesVisitor?: typeof visitNodes, tokenVisitor?: Visitor): T | undefined;
-}
-declare namespace ts {
-    function createPrinter(printerOptions?: PrinterOptions, handlers?: PrintHandlers): Printer;
-}
-declare namespace ts {
-    function findConfigFile(searchPath: string, fileExists: (fileName: string) => boolean, configName?: string): string | undefined;
-    function resolveTripleslashReference(moduleName: string, containingFile: string): string;
-    function createCompilerHost(options: CompilerOptions, setParentNodes?: boolean): CompilerHost;
-    function getPreEmitDiagnostics(program: Program, sourceFile?: SourceFile, cancellationToken?: CancellationToken): Diagnostic[];
-    interface FormatDiagnosticsHost {
-        getCurrentDirectory(): string;
-        getCanonicalFileName(fileName: string): string;
-        getNewLine(): string;
-    }
-    function formatDiagnostics(diagnostics: ReadonlyArray<Diagnostic>, host: FormatDiagnosticsHost): string;
-    function formatDiagnostic(diagnostic: Diagnostic, host: FormatDiagnosticsHost): string;
-    function formatDiagnosticsWithColorAndContext(diagnostics: ReadonlyArray<Diagnostic>, host: FormatDiagnosticsHost): string;
-    function flattenDiagnosticMessageText(messageText: string | DiagnosticMessageChain | undefined, newLine: string): string;
-    function getConfigFileParsingDiagnostics(configFileParseResult: ParsedCommandLine): ReadonlyArray<Diagnostic>;
-    /**
-     * Create a new 'Program' instance. A Program is an immutable collection of 'SourceFile's and a 'CompilerOptions'
-     * that represent a compilation unit.
-     *
-     * Creating a program proceeds from a set of root files, expanding the set of inputs by following imports and
-     * triple-slash-reference-path directives transitively. '@types' and triple-slash-reference-types are also pulled in.
-     *
-     * @param createProgramOptions - The options for creating a program.
-     * @returns A 'Program' object.
-     */
-    function createProgram(createProgramOptions: CreateProgramOptions): Program;
-    /**
-     * Create a new 'Program' instance. A Program is an immutable collection of 'SourceFile's and a 'CompilerOptions'
-     * that represent a compilation unit.
-     *
-     * Creating a program proceeds from a set of root files, expanding the set of inputs by following imports and
-     * triple-slash-reference-path directives transitively. '@types' and triple-slash-reference-types are also pulled in.
-     *
-     * @param rootNames - A set of root files.
-     * @param options - The compiler options which should be used.
-     * @param host - The host interacts with the underlying file system.
-     * @param oldProgram - Reuses an old program structure.
-     * @param configFileParsingDiagnostics - error during config file parsing
-     * @returns A 'Program' object.
-     */
-    function createProgram(rootNames: ReadonlyArray<string>, options: CompilerOptions, host?: CompilerHost, oldProgram?: Program, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>): Program;
-    /**
-     * Returns the target config filename of a project reference
-     */
-    function resolveProjectReferencePath(host: CompilerHost, ref: ProjectReference): string | undefined;
-}
-declare namespace ts {
-    interface EmitOutput {
-        outputFiles: OutputFile[];
-        emitSkipped: boolean;
-    }
-    interface OutputFile {
-        name: string;
-        writeByteOrderMark: boolean;
-        text: string;
-    }
-}
-declare namespace ts {
-    type AffectedFileResult<T> = {
-        result: T;
-        affected: SourceFile | Program;
-    } | undefined;
-    interface BuilderProgramHost {
-        /**
-         * return true if file names are treated with case sensitivity
-         */
-        useCaseSensitiveFileNames(): boolean;
-        /**
-         * If provided this would be used this hash instead of actual file shape text for detecting changes
-         */
-        createHash?: (data: string) => string;
-        /**
-         * When emit or emitNextAffectedFile are called without writeFile,
-         * this callback if present would be used to write files
-         */
-        writeFile?: WriteFileCallback;
-    }
-    /**
-     * Builder to manage the program state changes
-     */
-    interface BuilderProgram {
-        /**
-         * Returns current program
-         */
-        getProgram(): Program;
-        /**
-         * Get compiler options of the program
-         */
-        getCompilerOptions(): CompilerOptions;
-        /**
-         * Get the source file in the program with file name
-         */
-        getSourceFile(fileName: string): SourceFile | undefined;
-        /**
-         * Get a list of files in the program
-         */
-        getSourceFiles(): ReadonlyArray<SourceFile>;
-        /**
-         * Get the diagnostics for compiler options
-         */
-        getOptionsDiagnostics(cancellationToken?: CancellationToken): ReadonlyArray<Diagnostic>;
-        /**
-         * Get the diagnostics that dont belong to any file
-         */
-        getGlobalDiagnostics(cancellationToken?: CancellationToken): ReadonlyArray<Diagnostic>;
-        /**
-         * Get the diagnostics from config file parsing
-         */
-        getConfigFileParsingDiagnostics(): ReadonlyArray<Diagnostic>;
-        /**
-         * Get the syntax diagnostics, for all source files if source file is not supplied
-         */
-        getSyntacticDiagnostics(sourceFile?: SourceFile, cancellationToken?: CancellationToken): ReadonlyArray<Diagnostic>;
-        /**
-         * Get all the dependencies of the file
-         */
-        getAllDependencies(sourceFile: SourceFile): ReadonlyArray<string>;
-        /**
-         * Gets the semantic diagnostics from the program corresponding to this state of file (if provided) or whole program
-         * The semantic diagnostics are cached and managed here
-         * Note that it is assumed that when asked about semantic diagnostics through this API,
-         * the file has been taken out of affected files so it is safe to use cache or get from program and cache the diagnostics
-         * In case of SemanticDiagnosticsBuilderProgram if the source file is not provided,
-         * it will iterate through all the affected files, to ensure that cache stays valid and yet provide a way to get all semantic diagnostics
-         */
-        getSemanticDiagnostics(sourceFile?: SourceFile, cancellationToken?: CancellationToken): ReadonlyArray<Diagnostic>;
-        /**
-         * Emits the JavaScript and declaration files.
-         * When targetSource file is specified, emits the files corresponding to that source file,
-         * otherwise for the whole program.
-         * In case of EmitAndSemanticDiagnosticsBuilderProgram, when targetSourceFile is specified,
-         * it is assumed that that file is handled from affected file list. If targetSourceFile is not specified,
-         * it will only emit all the affected files instead of whole program
-         *
-         * The first of writeFile if provided, writeFile of BuilderProgramHost if provided, writeFile of compiler host
-         * in that order would be used to write the files
-         */
-        emit(targetSourceFile?: SourceFile, writeFile?: WriteFileCallback, cancellationToken?: CancellationToken, emitOnlyDtsFiles?: boolean, customTransformers?: CustomTransformers): EmitResult;
-        /**
-         * Get the current directory of the program
-         */
-        getCurrentDirectory(): string;
-    }
-    /**
-     * The builder that caches the semantic diagnostics for the program and handles the changed files and affected files
-     */
-    interface SemanticDiagnosticsBuilderProgram extends BuilderProgram {
-        /**
-         * Gets the semantic diagnostics from the program for the next affected file and caches it
-         * Returns undefined if the iteration is complete
-         */
-        getSemanticDiagnosticsOfNextAffectedFile(cancellationToken?: CancellationToken, ignoreSourceFile?: (sourceFile: SourceFile) => boolean): AffectedFileResult<ReadonlyArray<Diagnostic>>;
-    }
-    /**
-     * The builder that can handle the changes in program and iterate through changed file to emit the files
-     * The semantic diagnostics are cached per file and managed by clearing for the changed/affected files
-     */
-    interface EmitAndSemanticDiagnosticsBuilderProgram extends BuilderProgram {
-        /**
-         * Emits the next affected file's emit result (EmitResult and sourceFiles emitted) or returns undefined if iteration is complete
-         * The first of writeFile if provided, writeFile of BuilderProgramHost if provided, writeFile of compiler host
-         * in that order would be used to write the files
-         */
-        emitNextAffectedFile(writeFile?: WriteFileCallback, cancellationToken?: CancellationToken, emitOnlyDtsFiles?: boolean, customTransformers?: CustomTransformers): AffectedFileResult<EmitResult>;
-    }
-    /**
-     * Create the builder to manage semantic diagnostics and cache them
-     */
-    function createSemanticDiagnosticsBuilderProgram(newProgram: Program, host: BuilderProgramHost, oldProgram?: SemanticDiagnosticsBuilderProgram, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>): SemanticDiagnosticsBuilderProgram;
-    function createSemanticDiagnosticsBuilderProgram(rootNames: ReadonlyArray<string> | undefined, options: CompilerOptions | undefined, host?: CompilerHost, oldProgram?: SemanticDiagnosticsBuilderProgram, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>): SemanticDiagnosticsBuilderProgram;
-    /**
-     * Create the builder that can handle the changes in program and iterate through changed files
-     * to emit the those files and manage semantic diagnostics cache as well
-     */
-    function createEmitAndSemanticDiagnosticsBuilderProgram(newProgram: Program, host: BuilderProgramHost, oldProgram?: EmitAndSemanticDiagnosticsBuilderProgram, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>): EmitAndSemanticDiagnosticsBuilderProgram;
-    function createEmitAndSemanticDiagnosticsBuilderProgram(rootNames: ReadonlyArray<string> | undefined, options: CompilerOptions | undefined, host?: CompilerHost, oldProgram?: EmitAndSemanticDiagnosticsBuilderProgram, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>): EmitAndSemanticDiagnosticsBuilderProgram;
-    /**
-     * Creates a builder thats just abstraction over program and can be used with watch
-     */
-    function createAbstractBuilder(newProgram: Program, host: BuilderProgramHost, oldProgram?: BuilderProgram, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>): BuilderProgram;
-    function createAbstractBuilder(rootNames: ReadonlyArray<string> | undefined, options: CompilerOptions | undefined, host?: CompilerHost, oldProgram?: BuilderProgram, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>): BuilderProgram;
-}
-declare namespace ts {
-    type WatchStatusReporter = (diagnostic: Diagnostic, newLine: string, options: CompilerOptions) => void;
-    /** Create the program with rootNames and options, if they are undefined, oldProgram and new configFile diagnostics create new program */
-    type CreateProgram<T extends BuilderProgram> = (rootNames: ReadonlyArray<string> | undefined, options: CompilerOptions | undefined, host?: CompilerHost, oldProgram?: T, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>) => T;
-    interface WatchCompilerHost<T extends BuilderProgram> {
-        /**
-         * Used to create the program when need for program creation or recreation detected
-         */
-        createProgram: CreateProgram<T>;
-        /** If provided, callback to invoke after every new program creation */
-        afterProgramCreate?(program: T): void;
-        /** If provided, called with Diagnostic message that informs about change in watch status */
-        onWatchStatusChange?(diagnostic: Diagnostic, newLine: string, options: CompilerOptions): void;
-        useCaseSensitiveFileNames(): boolean;
-        getNewLine(): string;
-        getCurrentDirectory(): string;
-        getDefaultLibFileName(options: CompilerOptions): string;
-        getDefaultLibLocation?(): string;
-        createHash?(data: string): string;
-        /**
-         * Use to check file presence for source files and
-         * if resolveModuleNames is not provided (complier is in charge of module resolution) then module files as well
-         */
-        fileExists(path: string): boolean;
-        /**
-         * Use to read file text for source files and
-         * if resolveModuleNames is not provided (complier is in charge of module resolution) then module files as well
-         */
-        readFile(path: string, encoding?: string): string | undefined;
-        /** If provided, used for module resolution as well as to handle directory structure */
-        directoryExists?(path: string): boolean;
-        /** If provided, used in resolutions as well as handling directory structure */
-        getDirectories?(path: string): string[];
-        /** If provided, used to cache and handle directory structure modifications */
-        readDirectory?(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
-        /** Symbol links resolution */
-        realpath?(path: string): string;
-        /** If provided would be used to write log about compilation */
-        trace?(s: string): void;
-        /** If provided is used to get the environment variable */
-        getEnvironmentVariable?(name: string): string | undefined;
-        /** If provided, used to resolve the module names, otherwise typescript's default module resolution */
-        resolveModuleNames?(moduleNames: string[], containingFile: string, reusedNames?: string[]): ResolvedModule[];
-        /** If provided, used to resolve type reference directives, otherwise typescript's default resolution */
-        resolveTypeReferenceDirectives?(typeReferenceDirectiveNames: string[], containingFile: string): ResolvedTypeReferenceDirective[];
-        /** Used to watch changes in source files, missing files needed to update the program or config file */
-        watchFile(path: string, callback: FileWatcherCallback, pollingInterval?: number): FileWatcher;
-        /** Used to watch resolved module's failed lookup locations, config file specs, type roots where auto type reference directives are added */
-        watchDirectory(path: string, callback: DirectoryWatcherCallback, recursive?: boolean): FileWatcher;
-        /** If provided, will be used to set delayed compilation, so that multiple changes in short span are compiled together */
-        setTimeout?(callback: (...args: any[]) => void, ms: number, ...args: any[]): any;
-        /** If provided, will be used to reset existing delayed compilation */
-        clearTimeout?(timeoutId: any): void;
-    }
-    /**
-     * Host to create watch with root files and options
-     */
-    interface WatchCompilerHostOfFilesAndCompilerOptions<T extends BuilderProgram> extends WatchCompilerHost<T> {
-        /** root files to use to generate program */
-        rootFiles: string[];
-        /** Compiler options */
-        options: CompilerOptions;
-    }
-    /**
-     * Host to create watch with config file
-     */
-    interface WatchCompilerHostOfConfigFile<T extends BuilderProgram> extends WatchCompilerHost<T>, ConfigFileDiagnosticsReporter {
-        /** Name of the config file to compile */
-        configFileName: string;
-        /** Options to extend */
-        optionsToExtend?: CompilerOptions;
-        /**
-         * Used to generate source file names from the config file and its include, exclude, files rules
-         * and also to cache the directory stucture
-         */
-        readDirectory(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
-    }
-    interface Watch<T> {
-        /** Synchronize with host and get updated program */
-        getProgram(): T;
-    }
-    /**
-     * Creates the watch what generates program using the config file
-     */
-    interface WatchOfConfigFile<T> extends Watch<T> {
-    }
-    /**
-     * Creates the watch that generates program using the root files and compiler options
-     */
-    interface WatchOfFilesAndCompilerOptions<T> extends Watch<T> {
-        /** Updates the root files in the program, only if this is not config file compilation */
-        updateRootFileNames(fileNames: string[]): void;
-    }
-    /**
-     * Create the watch compiler host for either configFile or fileNames and its options
-     */
-    function createWatchCompilerHost<T extends BuilderProgram>(rootFiles: string[], options: CompilerOptions, system: System, createProgram?: CreateProgram<T>, reportDiagnostic?: DiagnosticReporter, reportWatchStatus?: WatchStatusReporter): WatchCompilerHostOfFilesAndCompilerOptions<T>;
-    function createWatchCompilerHost<T extends BuilderProgram>(configFileName: string, optionsToExtend: CompilerOptions | undefined, system: System, createProgram?: CreateProgram<T>, reportDiagnostic?: DiagnosticReporter, reportWatchStatus?: WatchStatusReporter): WatchCompilerHostOfConfigFile<T>;
-    /**
-     * Creates the watch from the host for root files and compiler options
-     */
-    function createWatchProgram<T extends BuilderProgram>(host: WatchCompilerHostOfFilesAndCompilerOptions<T>): WatchOfFilesAndCompilerOptions<T>;
-    /**
-     * Creates the watch from the host for config file
-     */
-    function createWatchProgram<T extends BuilderProgram>(host: WatchCompilerHostOfConfigFile<T>): WatchOfConfigFile<T>;
-}
-declare namespace ts {
-    function parseCommandLine(commandLine: ReadonlyArray<string>, readFile?: (path: string) => string | undefined): ParsedCommandLine;
-    type DiagnosticReporter = (diagnostic: Diagnostic) => void;
-    /**
-     * Reports config file diagnostics
-     */
-    interface ConfigFileDiagnosticsReporter {
-        /**
-         * Reports unrecoverable error when parsing config file
-         */
-        onUnRecoverableConfigFileDiagnostic: DiagnosticReporter;
-    }
-    /**
-     * Interface extending ParseConfigHost to support ParseConfigFile that reads config file and reports errors
-     */
-    interface ParseConfigFileHost extends ParseConfigHost, ConfigFileDiagnosticsReporter {
-        getCurrentDirectory(): string;
-    }
-    /**
-     * Reads the config file, reports errors if any and exits if the config file cannot be found
-     */
-    function getParsedCommandLineOfConfigFile(configFileName: string, optionsToExtend: CompilerOptions, host: ParseConfigFileHost): ParsedCommandLine | undefined;
-    /**
-     * Read tsconfig.json file
-     * @param fileName The path to the config file
-     */
-    function readConfigFile(fileName: string, readFile: (path: string) => string | undefined): {
-        config?: any;
-        error?: Diagnostic;
-    };
-    /**
-     * Parse the text of the tsconfig.json file
-     * @param fileName The path to the config file
-     * @param jsonText The text of the config file
-     */
-    function parseConfigFileTextToJson(fileName: string, jsonText: string): {
-        config?: any;
-        error?: Diagnostic;
-    };
-    /**
-     * Read tsconfig.json file
-     * @param fileName The path to the config file
-     */
-    function readJsonConfigFile(fileName: string, readFile: (path: string) => string | undefined): TsConfigSourceFile;
-    /**
-     * Convert the json syntax tree into the json value
-     */
-    function convertToObject(sourceFile: JsonSourceFile, errors: Push<Diagnostic>): any;
-    /**
-     * Parse the contents of a config file (tsconfig.json).
-     * @param json The contents of the config file to parse
-     * @param host Instance of ParseConfigHost used to enumerate files in folder.
-     * @param basePath A root directory to resolve relative path entries in the config
-     *    file to. e.g. outDir
-     */
-    function parseJsonConfigFileContent(json: any, host: ParseConfigHost, basePath: string, existingOptions?: CompilerOptions, configFileName?: string, resolutionStack?: Path[], extraFileExtensions?: ReadonlyArray<FileExtensionInfo>): ParsedCommandLine;
-    /**
-     * Parse the contents of a config file (tsconfig.json).
-     * @param jsonNode The contents of the config file to parse
-     * @param host Instance of ParseConfigHost used to enumerate files in folder.
-     * @param basePath A root directory to resolve relative path entries in the config
-     *    file to. e.g. outDir
-     */
-    function parseJsonSourceFileConfigFileContent(sourceFile: TsConfigSourceFile, host: ParseConfigHost, basePath: string, existingOptions?: CompilerOptions, configFileName?: string, resolutionStack?: Path[], extraFileExtensions?: ReadonlyArray<FileExtensionInfo>): ParsedCommandLine;
-    function convertCompilerOptionsFromJson(jsonOptions: any, basePath: string, configFileName?: string): {
-        options: CompilerOptions;
-        errors: Diagnostic[];
-    };
-    function convertTypeAcquisitionFromJson(jsonOptions: any, basePath: string, configFileName?: string): {
-        options: TypeAcquisition;
-        errors: Diagnostic[];
-    };
-}
-declare namespace ts {
-    interface Node {
-        getSourceFile(): SourceFile;
-        getChildCount(sourceFile?: SourceFile): number;
-        getChildAt(index: number, sourceFile?: SourceFile): Node;
-        getChildren(sourceFile?: SourceFile): Node[];
-        getStart(sourceFile?: SourceFile, includeJsDocComment?: boolean): number;
-        getFullStart(): number;
-        getEnd(): number;
-        getWidth(sourceFile?: SourceFileLike): number;
-        getFullWidth(): number;
-        getLeadingTriviaWidth(sourceFile?: SourceFile): number;
-        getFullText(sourceFile?: SourceFile): string;
-        getText(sourceFile?: SourceFile): string;
-        getFirstToken(sourceFile?: SourceFile): Node | undefined;
-        getLastToken(sourceFile?: SourceFile): Node | undefined;
-        forEachChild<T>(cbNode: (node: Node) => T | undefined, cbNodeArray?: (nodes: NodeArray<Node>) => T | undefined): T | undefined;
-    }
-    interface Identifier {
-        readonly text: string;
-    }
-    interface Symbol {
-        readonly name: string;
-        getFlags(): SymbolFlags;
-        getEscapedName(): __String;
-        getName(): string;
-        getDeclarations(): Declaration[] | undefined;
-        getDocumentationComment(typeChecker: TypeChecker | undefined): SymbolDisplayPart[];
-        getJsDocTags(): JSDocTagInfo[];
-    }
-    interface Type {
-        getFlags(): TypeFlags;
-        getSymbol(): Symbol | undefined;
-        getProperties(): Symbol[];
-        getProperty(propertyName: string): Symbol | undefined;
-        getApparentProperties(): Symbol[];
-        getCallSignatures(): Signature[];
-        getConstructSignatures(): Signature[];
-        getStringIndexType(): Type | undefined;
-        getNumberIndexType(): Type | undefined;
-        getBaseTypes(): BaseType[] | undefined;
-        getNonNullableType(): Type;
-        getConstraint(): Type | undefined;
-        getDefault(): Type | undefined;
-        isUnion(): this is UnionType;
-        isIntersection(): this is IntersectionType;
-        isUnionOrIntersection(): this is UnionOrIntersectionType;
-        isLiteral(): this is LiteralType;
-        isStringLiteral(): this is StringLiteralType;
-        isNumberLiteral(): this is NumberLiteralType;
-        isTypeParameter(): this is TypeParameter;
-        isClassOrInterface(): this is InterfaceType;
-        isClass(): this is InterfaceType;
-    }
-    interface Signature {
-        getDeclaration(): SignatureDeclaration;
-        getTypeParameters(): TypeParameter[] | undefined;
-        getParameters(): Symbol[];
-        getReturnType(): Type;
-        getDocumentationComment(typeChecker: TypeChecker | undefined): SymbolDisplayPart[];
-        getJsDocTags(): JSDocTagInfo[];
-    }
-    interface SourceFile {
-        getLineAndCharacterOfPosition(pos: number): LineAndCharacter;
-        getLineEndOfPosition(pos: number): number;
-        getLineStarts(): ReadonlyArray<number>;
-        getPositionOfLineAndCharacter(line: number, character: number): number;
-        update(newText: string, textChangeRange: TextChangeRange): SourceFile;
-    }
-    interface SourceFileLike {
-        getLineAndCharacterOfPosition(pos: number): LineAndCharacter;
-    }
-    interface SourceMapSource {
-        getLineAndCharacterOfPosition(pos: number): LineAndCharacter;
-    }
-    /**
-     * Represents an immutable snapshot of a script at a specified time.Once acquired, the
-     * snapshot is observably immutable. i.e. the same calls with the same parameters will return
-     * the same values.
-     */
-    interface IScriptSnapshot {
-        /** Gets a portion of the script snapshot specified by [start, end). */
-        getText(start: number, end: number): string;
-        /** Gets the length of this script snapshot. */
-        getLength(): number;
-        /**
-         * Gets the TextChangeRange that describe how the text changed between this text and
-         * an older version.  This information is used by the incremental parser to determine
-         * what sections of the script need to be re-parsed.  'undefined' can be returned if the
-         * change range cannot be determined.  However, in that case, incremental parsing will
-         * not happen and the entire document will be re - parsed.
-         */
-        getChangeRange(oldSnapshot: IScriptSnapshot): TextChangeRange | undefined;
-        /** Releases all resources held by this script snapshot */
-        dispose?(): void;
-    }
-    namespace ScriptSnapshot {
-        function fromString(text: string): IScriptSnapshot;
-    }
-    interface PreProcessedFileInfo {
-        referencedFiles: FileReference[];
-        typeReferenceDirectives: FileReference[];
-        libReferenceDirectives: FileReference[];
-        importedFiles: FileReference[];
-        ambientExternalModules?: string[];
-        isLibFile: boolean;
-    }
-    interface HostCancellationToken {
-        isCancellationRequested(): boolean;
-    }
-    interface InstallPackageOptions {
-        fileName: Path;
-        packageName: string;
-    }
-    interface LanguageServiceHost extends GetEffectiveTypeRootsHost {
-        getCompilationSettings(): CompilerOptions;
-        getNewLine?(): string;
-        getProjectVersion?(): string;
-        getScriptFileNames(): string[];
-        getScriptKind?(fileName: string): ScriptKind;
-        getScriptVersion(fileName: string): string;
-        getScriptSnapshot(fileName: string): IScriptSnapshot | undefined;
-        getProjectReferences?(): ReadonlyArray<ProjectReference> | undefined;
-        getLocalizedDiagnosticMessages?(): any;
-        getCancellationToken?(): HostCancellationToken;
-        getCurrentDirectory(): string;
-        getDefaultLibFileName(options: CompilerOptions): string;
-        log?(s: string): void;
-        trace?(s: string): void;
-        error?(s: string): void;
-        useCaseSensitiveFileNames?(): boolean;
-        readDirectory?(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
-        readFile?(path: string, encoding?: string): string | undefined;
-        realpath?(path: string): string;
-        fileExists?(path: string): boolean;
-        getTypeRootsVersion?(): number;
-        resolveModuleNames?(moduleNames: string[], containingFile: string, reusedNames?: string[]): ResolvedModule[];
-        getResolvedModuleWithFailedLookupLocationsFromCache?(modulename: string, containingFile: string): ResolvedModuleWithFailedLookupLocations | undefined;
-        resolveTypeReferenceDirectives?(typeDirectiveNames: string[], containingFile: string): ResolvedTypeReferenceDirective[];
-        getDirectories?(directoryName: string): string[];
-        /**
-         * Gets a set of custom transformers to use during emit.
-         */
-        getCustomTransformers?(): CustomTransformers | undefined;
-        isKnownTypesPackageName?(name: string): boolean;
-        installPackage?(options: InstallPackageOptions): Promise<ApplyCodeActionCommandResult>;
-    }
-    interface UserPreferences {
-        readonly disableSuggestions?: boolean;
-        readonly quotePreference?: "double" | "single";
-        readonly includeCompletionsForModuleExports?: boolean;
-        readonly includeCompletionsWithInsertText?: boolean;
-        readonly importModuleSpecifierPreference?: "relative" | "non-relative";
-        readonly allowTextChangesInNewFiles?: boolean;
-    }
-    interface LanguageService {
-        cleanupSemanticCache(): void;
-        getSyntacticDiagnostics(fileName: string): DiagnosticWithLocation[];
-        /** The first time this is called, it will return global diagnostics (no location). */
-        getSemanticDiagnostics(fileName: string): Diagnostic[];
-        getSuggestionDiagnostics(fileName: string): DiagnosticWithLocation[];
-        getCompilerOptionsDiagnostics(): Diagnostic[];
-        /**
-         * @deprecated Use getEncodedSyntacticClassifications instead.
-         */
-        getSyntacticClassifications(fileName: string, span: TextSpan): ClassifiedSpan[];
-        /**
-         * @deprecated Use getEncodedSemanticClassifications instead.
-         */
-        getSemanticClassifications(fileName: string, span: TextSpan): ClassifiedSpan[];
-        getEncodedSyntacticClassifications(fileName: string, span: TextSpan): Classifications;
-        getEncodedSemanticClassifications(fileName: string, span: TextSpan): Classifications;
-        getCompletionsAtPosition(fileName: string, position: number, options: GetCompletionsAtPositionOptions | undefined): CompletionInfo | undefined;
-        getCompletionEntryDetails(fileName: string, position: number, name: string, formatOptions: FormatCodeOptions | FormatCodeSettings | undefined, source: string | undefined, preferences: UserPreferences | undefined): CompletionEntryDetails | undefined;
-        getCompletionEntrySymbol(fileName: string, position: number, name: string, source: string | undefined): Symbol | undefined;
-        getQuickInfoAtPosition(fileName: string, position: number): QuickInfo | undefined;
-        getNameOrDottedNameSpan(fileName: string, startPos: number, endPos: number): TextSpan | undefined;
-        getBreakpointStatementAtPosition(fileName: string, position: number): TextSpan | undefined;
-        getSignatureHelpItems(fileName: string, position: number): SignatureHelpItems | undefined;
-        getRenameInfo(fileName: string, position: number): RenameInfo;
-        findRenameLocations(fileName: string, position: number, findInStrings: boolean, findInComments: boolean): RenameLocation[] | undefined;
-        getDefinitionAtPosition(fileName: string, position: number): DefinitionInfo[] | undefined;
-        getDefinitionAndBoundSpan(fileName: string, position: number): DefinitionInfoAndBoundSpan | undefined;
-        getTypeDefinitionAtPosition(fileName: string, position: number): DefinitionInfo[] | undefined;
-        getImplementationAtPosition(fileName: string, position: number): ImplementationLocation[] | undefined;
-        getReferencesAtPosition(fileName: string, position: number): ReferenceEntry[] | undefined;
-        findReferences(fileName: string, position: number): ReferencedSymbol[] | undefined;
-        getDocumentHighlights(fileName: string, position: number, filesToSearch: string[]): DocumentHighlights[] | undefined;
-        /** @deprecated */
-        getOccurrencesAtPosition(fileName: string, position: number): ReferenceEntry[] | undefined;
-        getNavigateToItems(searchValue: string, maxResultCount?: number, fileName?: string, excludeDtsFiles?: boolean): NavigateToItem[];
-        getNavigationBarItems(fileName: string): NavigationBarItem[];
-        getNavigationTree(fileName: string): NavigationTree;
-        getOutliningSpans(fileName: string): OutliningSpan[];
-        getTodoComments(fileName: string, descriptors: TodoCommentDescriptor[]): TodoComment[];
-        getBraceMatchingAtPosition(fileName: string, position: number): TextSpan[];
-        getIndentationAtPosition(fileName: string, position: number, options: EditorOptions | EditorSettings): number;
-        getFormattingEditsForRange(fileName: string, start: number, end: number, options: FormatCodeOptions | FormatCodeSettings): TextChange[];
-        getFormattingEditsForDocument(fileName: string, options: FormatCodeOptions | FormatCodeSettings): TextChange[];
-        getFormattingEditsAfterKeystroke(fileName: string, position: number, key: string, options: FormatCodeOptions | FormatCodeSettings): TextChange[];
-        getDocCommentTemplateAtPosition(fileName: string, position: number): TextInsertion | undefined;
-        isValidBraceCompletionAtPosition(fileName: string, position: number, openingBrace: number): boolean;
-        /**
-         * This will return a defined result if the position is after the `>` of the opening tag, or somewhere in the text, of a JSXElement with no closing tag.
-         * Editors should call this after `>` is typed.
-         */
-        getJsxClosingTagAtPosition(fileName: string, position: number): JsxClosingTagInfo | undefined;
-        getSpanOfEnclosingComment(fileName: string, position: number, onlyMultiLine: boolean): TextSpan | undefined;
-        toLineColumnOffset?(fileName: string, position: number): LineAndCharacter;
-        getCodeFixesAtPosition(fileName: string, start: number, end: number, errorCodes: ReadonlyArray<number>, formatOptions: FormatCodeSettings, preferences: UserPreferences): ReadonlyArray<CodeFixAction>;
-        getCombinedCodeFix(scope: CombinedCodeFixScope, fixId: {}, formatOptions: FormatCodeSettings, preferences: UserPreferences): CombinedCodeActions;
-        applyCodeActionCommand(action: CodeActionCommand): Promise<ApplyCodeActionCommandResult>;
-        applyCodeActionCommand(action: CodeActionCommand[]): Promise<ApplyCodeActionCommandResult[]>;
-        applyCodeActionCommand(action: CodeActionCommand | CodeActionCommand[]): Promise<ApplyCodeActionCommandResult | ApplyCodeActionCommandResult[]>;
-        /** @deprecated `fileName` will be ignored */
-        applyCodeActionCommand(fileName: string, action: CodeActionCommand): Promise<ApplyCodeActionCommandResult>;
-        /** @deprecated `fileName` will be ignored */
-        applyCodeActionCommand(fileName: string, action: CodeActionCommand[]): Promise<ApplyCodeActionCommandResult[]>;
-        /** @deprecated `fileName` will be ignored */
-        applyCodeActionCommand(fileName: string, action: CodeActionCommand | CodeActionCommand[]): Promise<ApplyCodeActionCommandResult | ApplyCodeActionCommandResult[]>;
-        getApplicableRefactors(fileName: string, positionOrRange: number | TextRange, preferences: UserPreferences | undefined): ApplicableRefactorInfo[];
-        getEditsForRefactor(fileName: string, formatOptions: FormatCodeSettings, positionOrRange: number | TextRange, refactorName: string, actionName: string, preferences: UserPreferences | undefined): RefactorEditInfo | undefined;
-        organizeImports(scope: OrganizeImportsScope, formatOptions: FormatCodeSettings, preferences: UserPreferences | undefined): ReadonlyArray<FileTextChanges>;
-        getEditsForFileRename(oldFilePath: string, newFilePath: string, formatOptions: FormatCodeSettings, preferences: UserPreferences | undefined): ReadonlyArray<FileTextChanges>;
-        getEmitOutput(fileName: string, emitOnlyDtsFiles?: boolean): EmitOutput;
-        getProgram(): Program | undefined;
-        dispose(): void;
-    }
-    interface JsxClosingTagInfo {
-        readonly newText: string;
-    }
-    interface CombinedCodeFixScope {
-        type: "file";
-        fileName: string;
-    }
-    type OrganizeImportsScope = CombinedCodeFixScope;
-    type CompletionsTriggerCharacter = "." | '"' | "'" | "`" | "/" | "@" | "<";
-    interface GetCompletionsAtPositionOptions extends UserPreferences {
-        /** If the editor is asking for completions because a certain character was typed, and not because the user explicitly requested them, this should be set. */
-        triggerCharacter?: CompletionsTriggerCharacter;
-        /** @deprecated Use includeCompletionsForModuleExports */
-        includeExternalModuleExports?: boolean;
-        /** @deprecated Use includeCompletionsWithInsertText */
-        includeInsertTextCompletions?: boolean;
-    }
-    interface ApplyCodeActionCommandResult {
-        successMessage: string;
-    }
-    interface Classifications {
-        spans: number[];
-        endOfLineState: EndOfLineState;
-    }
-    interface ClassifiedSpan {
-        textSpan: TextSpan;
-        classificationType: ClassificationTypeNames;
-    }
-    /**
-     * Navigation bar interface designed for visual studio's dual-column layout.
-     * This does not form a proper tree.
-     * The navbar is returned as a list of top-level items, each of which has a list of child items.
-     * Child items always have an empty array for their `childItems`.
-     */
-    interface NavigationBarItem {
-        text: string;
-        kind: ScriptElementKind;
-        kindModifiers: string;
-        spans: TextSpan[];
-        childItems: NavigationBarItem[];
-        indent: number;
-        bolded: boolean;
-        grayed: boolean;
-    }
-    /**
-     * Node in a tree of nested declarations in a file.
-     * The top node is always a script or module node.
-     */
-    interface NavigationTree {
-        /** Name of the declaration, or a short description, e.g. "<class>". */
-        text: string;
-        kind: ScriptElementKind;
-        /** ScriptElementKindModifier separated by commas, e.g. "public,abstract" */
-        kindModifiers: string;
-        /**
-         * Spans of the nodes that generated this declaration.
-         * There will be more than one if this is the result of merging.
-         */
-        spans: TextSpan[];
-        nameSpan: TextSpan | undefined;
-        /** Present if non-empty */
-        childItems?: NavigationTree[];
-    }
-    interface TodoCommentDescriptor {
-        text: string;
-        priority: number;
-    }
-    interface TodoComment {
-        descriptor: TodoCommentDescriptor;
-        message: string;
-        position: number;
-    }
-    class TextChange {
-        span: TextSpan;
-        newText: string;
-    }
-    interface FileTextChanges {
-        fileName: string;
-        textChanges: TextChange[];
-        isNewFile?: boolean;
-    }
-    interface CodeAction {
-        /** Description of the code action to display in the UI of the editor */
-        description: string;
-        /** Text changes to apply to each file as part of the code action */
-        changes: FileTextChanges[];
-        /**
-         * If the user accepts the code fix, the editor should send the action back in a `applyAction` request.
-         * This allows the language service to have side effects (e.g. installing dependencies) upon a code fix.
-         */
-        commands?: CodeActionCommand[];
-    }
-    interface CodeFixAction extends CodeAction {
-        /** Short name to identify the fix, for use by telemetry. */
-        fixName: string;
-        /**
-         * If present, one may call 'getCombinedCodeFix' with this fixId.
-         * This may be omitted to indicate that the code fix can't be applied in a group.
-         */
-        fixId?: {};
-        fixAllDescription?: string;
-    }
-    interface CombinedCodeActions {
-        changes: ReadonlyArray<FileTextChanges>;
-        commands?: ReadonlyArray<CodeActionCommand>;
-    }
-    type CodeActionCommand = InstallPackageAction;
-    interface InstallPackageAction {
-    }
-    /**
-     * A set of one or more available refactoring actions, grouped under a parent refactoring.
-     */
-    interface ApplicableRefactorInfo {
-        /**
-         * The programmatic name of the refactoring
-         */
-        name: string;
-        /**
-         * A description of this refactoring category to show to the user.
-         * If the refactoring gets inlined (see below), this text will not be visible.
-         */
-        description: string;
-        /**
-         * Inlineable refactorings can have their actions hoisted out to the top level
-         * of a context menu. Non-inlineanable refactorings should always be shown inside
-         * their parent grouping.
-         *
-         * If not specified, this value is assumed to be 'true'
-         */
-        inlineable?: boolean;
-        actions: RefactorActionInfo[];
-    }
-    /**
-     * Represents a single refactoring action - for example, the "Extract Method..." refactor might
-     * offer several actions, each corresponding to a surround class or closure to extract into.
-     */
-    interface RefactorActionInfo {
-        /**
-         * The programmatic name of the refactoring action
-         */
-        name: string;
-        /**
-         * A description of this refactoring action to show to the user.
-         * If the parent refactoring is inlined away, this will be the only text shown,
-         * so this description should make sense by itself if the parent is inlineable=true
-         */
-        description: string;
-    }
-    /**
-     * A set of edits to make in response to a refactor action, plus an optional
-     * location where renaming should be invoked from
-     */
-    interface RefactorEditInfo {
-        edits: FileTextChanges[];
-        renameFilename?: string;
-        renameLocation?: number;
-        commands?: CodeActionCommand[];
-    }
-    interface TextInsertion {
-        newText: string;
-        /** The position in newText the caret should point to after the insertion. */
-        caretOffset: number;
-    }
-    interface DocumentSpan {
-        textSpan: TextSpan;
-        fileName: string;
-        /**
-         * If the span represents a location that was remapped (e.g. via a .d.ts.map file),
-         * then the original filename and span will be specified here
-         */
-        originalTextSpan?: TextSpan;
-        originalFileName?: string;
-    }
-    interface RenameLocation extends DocumentSpan {
-    }
-    interface ReferenceEntry extends DocumentSpan {
-        isWriteAccess: boolean;
-        isDefinition: boolean;
-        isInString?: true;
-    }
-    interface ImplementationLocation extends DocumentSpan {
-        kind: ScriptElementKind;
-        displayParts: SymbolDisplayPart[];
-    }
-    interface DocumentHighlights {
-        fileName: string;
-        highlightSpans: HighlightSpan[];
-    }
-    enum HighlightSpanKind {
-        none = "none",
-        definition = "definition",
-        reference = "reference",
-        writtenReference = "writtenReference"
-    }
-    interface HighlightSpan {
-        fileName?: string;
-        isInString?: true;
-        textSpan: TextSpan;
-        kind: HighlightSpanKind;
-    }
-    interface NavigateToItem {
-        name: string;
-        kind: ScriptElementKind;
-        kindModifiers: string;
-        matchKind: string;
-        isCaseSensitive: boolean;
-        fileName: string;
-        textSpan: TextSpan;
-        containerName: string;
-        containerKind: ScriptElementKind;
-    }
-    enum IndentStyle {
-        None = 0,
-        Block = 1,
-        Smart = 2
-    }
-    interface EditorOptions {
-        BaseIndentSize?: number;
-        IndentSize: number;
-        TabSize: number;
-        NewLineCharacter: string;
-        ConvertTabsToSpaces: boolean;
-        IndentStyle: IndentStyle;
-    }
-    interface EditorSettings {
-        baseIndentSize?: number;
-        indentSize?: number;
-        tabSize?: number;
-        newLineCharacter?: string;
-        convertTabsToSpaces?: boolean;
-        indentStyle?: IndentStyle;
-    }
-    interface FormatCodeOptions extends EditorOptions {
-        InsertSpaceAfterCommaDelimiter: boolean;
-        InsertSpaceAfterSemicolonInForStatements: boolean;
-        InsertSpaceBeforeAndAfterBinaryOperators: boolean;
-        InsertSpaceAfterConstructor?: boolean;
-        InsertSpaceAfterKeywordsInControlFlowStatements: boolean;
-        InsertSpaceAfterFunctionKeywordForAnonymousFunctions: boolean;
-        InsertSpaceAfterOpeningAndBeforeClosingNonemptyParenthesis: boolean;
-        InsertSpaceAfterOpeningAndBeforeClosingNonemptyBrackets: boolean;
-        InsertSpaceAfterOpeningAndBeforeClosingNonemptyBraces?: boolean;
-        InsertSpaceAfterOpeningAndBeforeClosingTemplateStringBraces: boolean;
-        InsertSpaceAfterOpeningAndBeforeClosingJsxExpressionBraces?: boolean;
-        InsertSpaceAfterTypeAssertion?: boolean;
-        InsertSpaceBeforeFunctionParenthesis?: boolean;
-        PlaceOpenBraceOnNewLineForFunctions: boolean;
-        PlaceOpenBraceOnNewLineForControlBlocks: boolean;
-        insertSpaceBeforeTypeAnnotation?: boolean;
-    }
-    interface FormatCodeSettings extends EditorSettings {
-        insertSpaceAfterCommaDelimiter?: boolean;
-        insertSpaceAfterSemicolonInForStatements?: boolean;
-        insertSpaceBeforeAndAfterBinaryOperators?: boolean;
-        insertSpaceAfterConstructor?: boolean;
-        insertSpaceAfterKeywordsInControlFlowStatements?: boolean;
-        insertSpaceAfterFunctionKeywordForAnonymousFunctions?: boolean;
-        insertSpaceAfterOpeningAndBeforeClosingNonemptyParenthesis?: boolean;
-        insertSpaceAfterOpeningAndBeforeClosingNonemptyBrackets?: boolean;
-        insertSpaceAfterOpeningAndBeforeClosingNonemptyBraces?: boolean;
-        insertSpaceAfterOpeningAndBeforeClosingTemplateStringBraces?: boolean;
-        insertSpaceAfterOpeningAndBeforeClosingJsxExpressionBraces?: boolean;
-        insertSpaceAfterTypeAssertion?: boolean;
-        insertSpaceBeforeFunctionParenthesis?: boolean;
-        placeOpenBraceOnNewLineForFunctions?: boolean;
-        placeOpenBraceOnNewLineForControlBlocks?: boolean;
-        insertSpaceBeforeTypeAnnotation?: boolean;
-        indentMultiLineObjectLiteralBeginningOnBlankLine?: boolean;
-    }
-    interface DefinitionInfo extends DocumentSpan {
-        kind: ScriptElementKind;
-        name: string;
-        containerKind: ScriptElementKind;
-        containerName: string;
-    }
-    interface DefinitionInfoAndBoundSpan {
-        definitions?: ReadonlyArray<DefinitionInfo>;
-        textSpan: TextSpan;
-    }
-    interface ReferencedSymbolDefinitionInfo extends DefinitionInfo {
-        displayParts: SymbolDisplayPart[];
-    }
-    interface ReferencedSymbol {
-        definition: ReferencedSymbolDefinitionInfo;
-        references: ReferenceEntry[];
-    }
-    enum SymbolDisplayPartKind {
-        aliasName = 0,
-        className = 1,
-        enumName = 2,
-        fieldName = 3,
-        interfaceName = 4,
-        keyword = 5,
-        lineBreak = 6,
-        numericLiteral = 7,
-        stringLiteral = 8,
-        localName = 9,
-        methodName = 10,
-        moduleName = 11,
-        operator = 12,
-        parameterName = 13,
-        propertyName = 14,
-        punctuation = 15,
-        space = 16,
-        text = 17,
-        typeParameterName = 18,
-        enumMemberName = 19,
-        functionName = 20,
-        regularExpressionLiteral = 21
-    }
-    interface SymbolDisplayPart {
-        text: string;
-        kind: string;
-    }
-    interface JSDocTagInfo {
-        name: string;
-        text?: string;
-    }
-    interface QuickInfo {
-        kind: ScriptElementKind;
-        kindModifiers: string;
-        textSpan: TextSpan;
-        displayParts?: SymbolDisplayPart[];
-        documentation?: SymbolDisplayPart[];
-        tags?: JSDocTagInfo[];
-    }
-    interface RenameInfo {
-        canRename: boolean;
-        localizedErrorMessage?: string;
-        displayName: string;
-        fullDisplayName: string;
-        kind: ScriptElementKind;
-        kindModifiers: string;
-        triggerSpan: TextSpan;
-    }
-    interface SignatureHelpParameter {
-        name: string;
-        documentation: SymbolDisplayPart[];
-        displayParts: SymbolDisplayPart[];
-        isOptional: boolean;
-    }
-    /**
-     * Represents a single signature to show in signature help.
-     * The id is used for subsequent calls into the language service to ask questions about the
-     * signature help item in the context of any documents that have been updated.  i.e. after
-     * an edit has happened, while signature help is still active, the host can ask important
-     * questions like 'what parameter is the user currently contained within?'.
-     */
-    interface SignatureHelpItem {
-        isVariadic: boolean;
-        prefixDisplayParts: SymbolDisplayPart[];
-        suffixDisplayParts: SymbolDisplayPart[];
-        separatorDisplayParts: SymbolDisplayPart[];
-        parameters: SignatureHelpParameter[];
-        documentation: SymbolDisplayPart[];
-        tags: JSDocTagInfo[];
-    }
-    /**
-     * Represents a set of signature help items, and the preferred item that should be selected.
-     */
-    interface SignatureHelpItems {
-        items: SignatureHelpItem[];
-        applicableSpan: TextSpan;
-        selectedItemIndex: number;
-        argumentIndex: number;
-        argumentCount: number;
-    }
-    interface CompletionInfo {
-        /** Not true for all glboal completions. This will be true if the enclosing scope matches a few syntax kinds. See `isSnippetScope`. */
-        isGlobalCompletion: boolean;
-        isMemberCompletion: boolean;
-        /**
-         * true when the current location also allows for a new identifier
-         */
-        isNewIdentifierLocation: boolean;
-        entries: CompletionEntry[];
-    }
-    interface CompletionEntry {
-        name: string;
-        kind: ScriptElementKind;
-        kindModifiers?: string;
-        sortText: string;
-        insertText?: string;
-        /**
-         * An optional span that indicates the text to be replaced by this completion item.
-         * If present, this span should be used instead of the default one.
-         * It will be set if the required span differs from the one generated by the default replacement behavior.
-         */
-        replacementSpan?: TextSpan;
-        hasAction?: true;
-        source?: string;
-        isRecommended?: true;
-    }
-    interface CompletionEntryDetails {
-        name: string;
-        kind: ScriptElementKind;
-        kindModifiers: string;
-        displayParts: SymbolDisplayPart[];
-        documentation?: SymbolDisplayPart[];
-        tags?: JSDocTagInfo[];
-        codeActions?: CodeAction[];
-        source?: SymbolDisplayPart[];
-    }
-    interface OutliningSpan {
-        /** The span of the document to actually collapse. */
-        textSpan: TextSpan;
-        /** The span of the document to display when the user hovers over the collapsed span. */
-        hintSpan: TextSpan;
-        /** The text to display in the editor for the collapsed region. */
-        bannerText: string;
-        /**
-         * Whether or not this region should be automatically collapsed when
-         * the 'Collapse to Definitions' command is invoked.
-         */
-        autoCollapse: boolean;
-        /**
-         * Classification of the contents of the span
-         */
-        kind: OutliningSpanKind;
-    }
-    enum OutliningSpanKind {
-        /** Single or multi-line comments */
-        Comment = "comment",
-        /** Sections marked by '// #region' and '// #endregion' comments */
-        Region = "region",
-        /** Declarations and expressions */
-        Code = "code",
-        /** Contiguous blocks of import declarations */
-        Imports = "imports"
-    }
-    enum OutputFileType {
-        JavaScript = 0,
-        SourceMap = 1,
-        Declaration = 2
-    }
-    enum EndOfLineState {
-        None = 0,
-        InMultiLineCommentTrivia = 1,
-        InSingleQuoteStringLiteral = 2,
-        InDoubleQuoteStringLiteral = 3,
-        InTemplateHeadOrNoSubstitutionTemplate = 4,
-        InTemplateMiddleOrTail = 5,
-        InTemplateSubstitutionPosition = 6
-    }
-    enum TokenClass {
-        Punctuation = 0,
-        Keyword = 1,
-        Operator = 2,
-        Comment = 3,
-        Whitespace = 4,
-        Identifier = 5,
-        NumberLiteral = 6,
-        StringLiteral = 7,
-        RegExpLiteral = 8
-    }
-    interface ClassificationResult {
-        finalLexState: EndOfLineState;
-        entries: ClassificationInfo[];
-    }
-    interface ClassificationInfo {
-        length: number;
-        classification: TokenClass;
-    }
-    interface Classifier {
-        /**
-         * Gives lexical classifications of tokens on a line without any syntactic context.
-         * For instance, a token consisting of the text 'string' can be either an identifier
-         * named 'string' or the keyword 'string', however, because this classifier is not aware,
-         * it relies on certain heuristics to give acceptable results. For classifications where
-         * speed trumps accuracy, this function is preferable; however, for true accuracy, the
-         * syntactic classifier is ideal. In fact, in certain editing scenarios, combining the
-         * lexical, syntactic, and semantic classifiers may issue the best user experience.
-         *
-         * @param text                      The text of a line to classify.
-         * @param lexState                  The state of the lexical classifier at the end of the previous line.
-         * @param syntacticClassifierAbsent Whether the client is *not* using a syntactic classifier.
-         *                                  If there is no syntactic classifier (syntacticClassifierAbsent=true),
-         *                                  certain heuristics may be used in its place; however, if there is a
-         *                                  syntactic classifier (syntacticClassifierAbsent=false), certain
-         *                                  classifications which may be incorrectly categorized will be given
-         *                                  back as Identifiers in order to allow the syntactic classifier to
-         *                                  subsume the classification.
-         * @deprecated Use getLexicalClassifications instead.
-         */
-        getClassificationsForLine(text: string, lexState: EndOfLineState, syntacticClassifierAbsent: boolean): ClassificationResult;
-        getEncodedLexicalClassifications(text: string, endOfLineState: EndOfLineState, syntacticClassifierAbsent: boolean): Classifications;
-    }
-    enum ScriptElementKind {
-        unknown = "",
-        warning = "warning",
-        /** predefined type (void) or keyword (class) */
-        keyword = "keyword",
-        /** top level script node */
-        scriptElement = "script",
-        /** module foo {} */
-        moduleElement = "module",
-        /** class X {} */
-        classElement = "class",
-        /** var x = class X {} */
-        localClassElement = "local class",
-        /** interface Y {} */
-        interfaceElement = "interface",
-        /** type T = ... */
-        typeElement = "type",
-        /** enum E */
-        enumElement = "enum",
-        enumMemberElement = "enum member",
-        /**
-         * Inside module and script only
-         * const v = ..
-         */
-        variableElement = "var",
-        /** Inside function */
-        localVariableElement = "local var",
-        /**
-         * Inside module and script only
-         * function f() { }
-         */
-        functionElement = "function",
-        /** Inside function */
-        localFunctionElement = "local function",
-        /** class X { [public|private]* foo() {} } */
-        memberFunctionElement = "method",
-        /** class X { [public|private]* [get|set] foo:number; } */
-        memberGetAccessorElement = "getter",
-        memberSetAccessorElement = "setter",
-        /**
-         * class X { [public|private]* foo:number; }
-         * interface Y { foo:number; }
-         */
-        memberVariableElement = "property",
-        /** class X { constructor() { } } */
-        constructorImplementationElement = "constructor",
-        /** interface Y { ():number; } */
-        callSignatureElement = "call",
-        /** interface Y { []:number; } */
-        indexSignatureElement = "index",
-        /** interface Y { new():Y; } */
-        constructSignatureElement = "construct",
-        /** function foo(*Y*: string) */
-        parameterElement = "parameter",
-        typeParameterElement = "type parameter",
-        primitiveType = "primitive type",
-        label = "label",
-        alias = "alias",
-        constElement = "const",
-        letElement = "let",
-        directory = "directory",
-        externalModuleName = "external module name",
-        /**
-         * <JsxTagName attribute1 attribute2={0} />
-         */
-        jsxAttribute = "JSX attribute",
-        /** String literal */
-        string = "string"
-    }
-    enum ScriptElementKindModifier {
-        none = "",
-        publicMemberModifier = "public",
-        privateMemberModifier = "private",
-        protectedMemberModifier = "protected",
-        exportedModifier = "export",
-        ambientModifier = "declare",
-        staticModifier = "static",
-        abstractModifier = "abstract",
-        optionalModifier = "optional"
-    }
-    enum ClassificationTypeNames {
-        comment = "comment",
-        identifier = "identifier",
-        keyword = "keyword",
-        numericLiteral = "number",
-        operator = "operator",
-        stringLiteral = "string",
-        whiteSpace = "whitespace",
-        text = "text",
-        punctuation = "punctuation",
-        className = "class name",
-        enumName = "enum name",
-        interfaceName = "interface name",
-        moduleName = "module name",
-        typeParameterName = "type parameter name",
-        typeAliasName = "type alias name",
-        parameterName = "parameter name",
-        docCommentTagName = "doc comment tag name",
-        jsxOpenTagName = "jsx open tag name",
-        jsxCloseTagName = "jsx close tag name",
-        jsxSelfClosingTagName = "jsx self closing tag name",
-        jsxAttribute = "jsx attribute",
-        jsxText = "jsx text",
-        jsxAttributeStringLiteralValue = "jsx attribute string literal value"
-    }
-    enum ClassificationType {
-        comment = 1,
-        identifier = 2,
-        keyword = 3,
-        numericLiteral = 4,
-        operator = 5,
-        stringLiteral = 6,
-        regularExpressionLiteral = 7,
-        whiteSpace = 8,
-        text = 9,
-        punctuation = 10,
-        className = 11,
-        enumName = 12,
-        interfaceName = 13,
-        moduleName = 14,
-        typeParameterName = 15,
-        typeAliasName = 16,
-        parameterName = 17,
-        docCommentTagName = 18,
-        jsxOpenTagName = 19,
-        jsxCloseTagName = 20,
-        jsxSelfClosingTagName = 21,
-        jsxAttribute = 22,
-        jsxText = 23,
-        jsxAttributeStringLiteralValue = 24
-    }
-}
-declare namespace ts {
-    function createClassifier(): Classifier;
-}
-declare namespace ts {
-    /**
-     * The document registry represents a store of SourceFile objects that can be shared between
-     * multiple LanguageService instances. A LanguageService instance holds on the SourceFile (AST)
-     * of files in the context.
-     * SourceFile objects account for most of the memory usage by the language service. Sharing
-     * the same DocumentRegistry instance between different instances of LanguageService allow
-     * for more efficient memory utilization since all projects will share at least the library
-     * file (lib.d.ts).
-     *
-     * A more advanced use of the document registry is to serialize sourceFile objects to disk
-     * and re-hydrate them when needed.
-     *
-     * To create a default DocumentRegistry, use createDocumentRegistry to create one, and pass it
-     * to all subsequent createLanguageService calls.
-     */
-    interface DocumentRegistry {
-        /**
-         * Request a stored SourceFile with a given fileName and compilationSettings.
-         * The first call to acquire will call createLanguageServiceSourceFile to generate
-         * the SourceFile if was not found in the registry.
-         *
-         * @param fileName The name of the file requested
-         * @param compilationSettings Some compilation settings like target affects the
-         * shape of a the resulting SourceFile. This allows the DocumentRegistry to store
-         * multiple copies of the same file for different compilation settings.
-         * @param scriptSnapshot Text of the file. Only used if the file was not found
-         * in the registry and a new one was created.
-         * @param version Current version of the file. Only used if the file was not found
-         * in the registry and a new one was created.
-         */
-        acquireDocument(fileName: string, compilationSettings: CompilerOptions, scriptSnapshot: IScriptSnapshot, version: string, scriptKind?: ScriptKind): SourceFile;
-        acquireDocumentWithKey(fileName: string, path: Path, compilationSettings: CompilerOptions, key: DocumentRegistryBucketKey, scriptSnapshot: IScriptSnapshot, version: string, scriptKind?: ScriptKind): SourceFile;
-        /**
-         * Request an updated version of an already existing SourceFile with a given fileName
-         * and compilationSettings. The update will in-turn call updateLanguageServiceSourceFile
-         * to get an updated SourceFile.
-         *
-         * @param fileName The name of the file requested
-         * @param compilationSettings Some compilation settings like target affects the
-         * shape of a the resulting SourceFile. This allows the DocumentRegistry to store
-         * multiple copies of the same file for different compilation settings.
-         * @param scriptSnapshot Text of the file.
-         * @param version Current version of the file.
-         */
-        updateDocument(fileName: string, compilationSettings: CompilerOptions, scriptSnapshot: IScriptSnapshot, version: string, scriptKind?: ScriptKind): SourceFile;
-        updateDocumentWithKey(fileName: string, path: Path, compilationSettings: CompilerOptions, key: DocumentRegistryBucketKey, scriptSnapshot: IScriptSnapshot, version: string, scriptKind?: ScriptKind): SourceFile;
-        getKeyForCompilationSettings(settings: CompilerOptions): DocumentRegistryBucketKey;
-        /**
-         * Informs the DocumentRegistry that a file is not needed any longer.
-         *
-         * Note: It is not allowed to call release on a SourceFile that was not acquired from
-         * this registry originally.
-         *
-         * @param fileName The name of the file to be released
-         * @param compilationSettings The compilation settings used to acquire the file
-         */
-        releaseDocument(fileName: string, compilationSettings: CompilerOptions): void;
-        releaseDocumentWithKey(path: Path, key: DocumentRegistryBucketKey): void;
-        reportStats(): string;
-    }
-    type DocumentRegistryBucketKey = string & {
-        __bucketKey: any;
-    };
-    function createDocumentRegistry(useCaseSensitiveFileNames?: boolean, currentDirectory?: string): DocumentRegistry;
-}
-declare namespace ts {
-    function preProcessFile(sourceText: string, readImportFiles?: boolean, detectJavaScriptImports?: boolean): PreProcessedFileInfo;
-}
-declare namespace ts {
-    interface TranspileOptions {
-        compilerOptions?: CompilerOptions;
-        fileName?: string;
-        reportDiagnostics?: boolean;
-        moduleName?: string;
-        renamedDependencies?: MapLike<string>;
-        transformers?: CustomTransformers;
-    }
-    interface TranspileOutput {
-        outputText: string;
-        diagnostics?: Diagnostic[];
-        sourceMapText?: string;
-    }
-    function transpileModule(input: string, transpileOptions: TranspileOptions): TranspileOutput;
-    function transpile(input: string, compilerOptions?: CompilerOptions, fileName?: string, diagnostics?: Diagnostic[], moduleName?: string): string;
-}
-declare namespace ts {
-    /** The version of the language service API */
-    const servicesVersion = "0.8";
-    function toEditorSettings(options: EditorOptions | EditorSettings): EditorSettings;
-    function displayPartsToString(displayParts: SymbolDisplayPart[] | undefined): string;
-    function getDefaultCompilerOptions(): CompilerOptions;
-    function getSupportedCodeFixes(): string[];
-    function createLanguageServiceSourceFile(fileName: string, scriptSnapshot: IScriptSnapshot, scriptTarget: ScriptTarget, version: string, setNodeParents: boolean, scriptKind?: ScriptKind): SourceFile;
-    let disableIncrementalParsing: boolean;
-    function updateLanguageServiceSourceFile(sourceFile: SourceFile, scriptSnapshot: IScriptSnapshot, version: string, textChangeRange: TextChangeRange | undefined, aggressiveChecks?: boolean): SourceFile;
-    function createLanguageService(host: LanguageServiceHost, documentRegistry?: DocumentRegistry, syntaxOnly?: boolean): LanguageService;
-    /**
-     * Get the path of the default library files (lib.d.ts) as distributed with the typescript
-     * node package.
-     * The functionality is not supported if the ts module is consumed outside of a node module.
-     */
-    function getDefaultLibFilePath(options: CompilerOptions): string;
-}
-declare namespace ts {
-    /**
-     * Transform one or more nodes using the supplied transformers.
-     * @param source A single `Node` or an array of `Node` objects.
-     * @param transformers An array of `TransformerFactory` callbacks used to process the transformation.
-     * @param compilerOptions Optional compiler options.
-     */
-    function transform<T extends Node>(source: T | T[], transformers: TransformerFactory<T>[], compilerOptions?: CompilerOptions): TransformationResult<T>;
-}
-declare namespace ts.server {
-    interface CompressedData {
-        length: number;
-        compressionKind: string;
-        data: any;
-    }
-    type RequireResult = {
-        module: {};
-        error: undefined;
-    } | {
-        module: undefined;
-        error: {
-            stack?: string;
-            message?: string;
-        };
-    };
-    interface ServerHost extends System {
-        watchFile(path: string, callback: FileWatcherCallback, pollingInterval?: number): FileWatcher;
-        watchDirectory(path: string, callback: DirectoryWatcherCallback, recursive?: boolean): FileWatcher;
-        setTimeout(callback: (...args: any[]) => void, ms: number, ...args: any[]): any;
-        clearTimeout(timeoutId: any): void;
-        setImmediate(callback: (...args: any[]) => void, ...args: any[]): any;
-        clearImmediate(timeoutId: any): void;
-        gc?(): void;
-        trace?(s: string): void;
-        require?(initialPath: string, moduleName: string): RequireResult;
-    }
-    interface SortedReadonlyArray<T> extends ReadonlyArray<T> {
-        " __sortedArrayBrand": any;
-    }
-    interface TypingInstallerRequestWithProjectName {
-        readonly projectName: string;
-    }
-    interface DiscoverTypings extends TypingInstallerRequestWithProjectName {
-        readonly fileNames: string[];
-        readonly projectRootPath: Path;
-        readonly compilerOptions: CompilerOptions;
-        readonly typeAcquisition: TypeAcquisition;
-        readonly unresolvedImports: SortedReadonlyArray<string>;
-        readonly cachePath?: string;
-        readonly kind: "discover";
-    }
-    interface CloseProject extends TypingInstallerRequestWithProjectName {
-        readonly kind: "closeProject";
-    }
-    interface TypesRegistryRequest {
-        readonly kind: "typesRegistry";
-    }
-    interface InstallPackageRequest extends TypingInstallerRequestWithProjectName {
-        readonly kind: "installPackage";
-        readonly fileName: Path;
-        readonly packageName: string;
-        readonly projectRootPath: Path;
-    }
-    type ActionSet = "action::set";
-    type ActionInvalidate = "action::invalidate";
-    type ActionPackageInstalled = "action::packageInstalled";
-    type EventTypesRegistry = "event::typesRegistry";
-    type EventBeginInstallTypes = "event::beginInstallTypes";
-    type EventEndInstallTypes = "event::endInstallTypes";
-    type EventInitializationFailed = "event::initializationFailed";
-    interface TypingInstallerResponse {
-        readonly kind: ActionSet | ActionInvalidate | EventTypesRegistry | ActionPackageInstalled | EventBeginInstallTypes | EventEndInstallTypes | EventInitializationFailed;
-    }
-    interface PackageInstalledResponse extends ProjectResponse {
-        readonly kind: ActionPackageInstalled;
-        readonly success: boolean;
-        readonly message: string;
-    }
-    interface InitializationFailedResponse extends TypingInstallerResponse {
-        readonly kind: EventInitializationFailed;
-        readonly message: string;
-    }
-    interface ProjectResponse extends TypingInstallerResponse {
-        readonly projectName: string;
-    }
-    interface SetTypings extends ProjectResponse {
-        readonly typeAcquisition: TypeAcquisition;
-        readonly compilerOptions: CompilerOptions;
-        readonly typings: string[];
-        readonly unresolvedImports: SortedReadonlyArray<string>;
-        readonly kind: ActionSet;
-    }
-    interface InvalidateCachedTypings extends ProjectResponse {
-        readonly kind: ActionInvalidate;
-    }
-    interface InstallTypes extends ProjectResponse {
-        readonly kind: EventBeginInstallTypes | EventEndInstallTypes;
-        readonly eventId: number;
-        readonly typingsInstallerVersion: string;
-        readonly packagesToInstall: ReadonlyArray<string>;
-    }
-    interface BeginInstallTypes extends InstallTypes {
-        readonly kind: EventBeginInstallTypes;
-    }
-    interface EndInstallTypes extends InstallTypes {
-        readonly kind: EventEndInstallTypes;
-        readonly installSuccess: boolean;
-    }
-}
-declare namespace ts.server {
-    const ActionSet: ActionSet;
-    const ActionInvalidate: ActionInvalidate;
-    const ActionPackageInstalled: ActionPackageInstalled;
-    const EventTypesRegistry: EventTypesRegistry;
-    const EventBeginInstallTypes: EventBeginInstallTypes;
-    const EventEndInstallTypes: EventEndInstallTypes;
-    const EventInitializationFailed: EventInitializationFailed;
-    namespace Arguments {
-        const GlobalCacheLocation = "--globalTypingsCacheLocation";
-        const LogFile = "--logFile";
-        const EnableTelemetry = "--enableTelemetry";
-        const TypingSafeListLocation = "--typingSafeListLocation";
-        const TypesMapLocation = "--typesMapLocation";
-        /**
-         * This argument specifies the location of the NPM executable.
-         * typingsInstaller will run the command with `${npmLocation} install ...`.
-         */
-        const NpmLocation = "--npmLocation";
-    }
-    function hasArgument(argumentName: string): boolean;
-    function findArgument(argumentName: string): string | undefined;
-}
-declare namespace ts.server {
-    enum LogLevel {
-        terse = 0,
-        normal = 1,
-        requestTime = 2,
-        verbose = 3
-    }
-    const emptyArray: SortedReadonlyArray<never>;
-    interface Logger {
-        close(): void;
-        hasLevel(level: LogLevel): boolean;
-        loggingEnabled(): boolean;
-        perftrc(s: string): void;
-        info(s: string): void;
-        startGroup(): void;
-        endGroup(): void;
-        msg(s: string, type?: Msg): void;
-        getLogFileName(): string | undefined;
-    }
-    enum Msg {
-        Err = "Err",
-        Info = "Info",
-        Perf = "Perf"
-    }
-    namespace Msg {
-        /** @deprecated Only here for backwards-compatibility. Prefer just `Msg`. */
-        type Types = Msg;
-    }
-    function createInstallTypingsRequest(project: Project, typeAcquisition: TypeAcquisition, unresolvedImports: SortedReadonlyArray<string>, cachePath?: string): DiscoverTypings;
-    namespace Errors {
-        function ThrowNoProject(): never;
-        function ThrowProjectLanguageServiceDisabled(): never;
-        function ThrowProjectDoesNotContainDocument(fileName: string, project: Project): never;
-    }
-    function getDefaultFormatCodeSettings(host: ServerHost): FormatCodeSettings;
-    type NormalizedPath = string & {
-        __normalizedPathTag: any;
-    };
-    function toNormalizedPath(fileName: string): NormalizedPath;
-    function normalizedPathToPath(normalizedPath: NormalizedPath, currentDirectory: string, getCanonicalFileName: (f: string) => string): Path;
-    function asNormalizedPath(fileName: string): NormalizedPath;
-    interface NormalizedPathMap<T> {
-        get(path: NormalizedPath): T | undefined;
-        set(path: NormalizedPath, value: T): void;
-        contains(path: NormalizedPath): boolean;
-        remove(path: NormalizedPath): void;
-    }
-    function createNormalizedPathMap<T>(): NormalizedPathMap<T>;
-    interface ProjectOptions {
-        configHasExtendsProperty: boolean;
-        /**
-         * true if config file explicitly listed files
-         */
-        configHasFilesProperty: boolean;
-        configHasIncludeProperty: boolean;
-        configHasExcludeProperty: boolean;
-        projectReferences: ReadonlyArray<ProjectReference> | undefined;
-        /**
-         * these fields can be present in the project file
-         */
-        files?: string[];
-        wildcardDirectories?: Map<WatchDirectoryFlags>;
-        compilerOptions?: CompilerOptions;
-        typeAcquisition?: TypeAcquisition;
-        compileOnSave?: boolean;
-    }
-    function isInferredProjectName(name: string): boolean;
-    function makeInferredProjectName(counter: number): string;
-    function createSortedArray<T>(): SortedArray<T>;
-}
-/**
- * Declaration module describing the TypeScript Server protocol
- */
-declare namespace ts.server.protocol {
-    enum CommandTypes {
-        JsxClosingTag = "jsxClosingTag",
-        Brace = "brace",
-        BraceCompletion = "braceCompletion",
-        GetSpanOfEnclosingComment = "getSpanOfEnclosingComment",
-        Change = "change",
-        Close = "close",
-        Completions = "completions",
-        CompletionDetails = "completionEntryDetails",
-        CompileOnSaveAffectedFileList = "compileOnSaveAffectedFileList",
-        CompileOnSaveEmitFile = "compileOnSaveEmitFile",
-        Configure = "configure",
-        Definition = "definition",
-        DefinitionAndBoundSpan = "definitionAndBoundSpan",
-        Implementation = "implementation",
-        Exit = "exit",
-        Format = "format",
-        Formatonkey = "formatonkey",
-        Geterr = "geterr",
-        GeterrForProject = "geterrForProject",
-        SemanticDiagnosticsSync = "semanticDiagnosticsSync",
-        SyntacticDiagnosticsSync = "syntacticDiagnosticsSync",
-        SuggestionDiagnosticsSync = "suggestionDiagnosticsSync",
-        NavBar = "navbar",
-        Navto = "navto",
-        NavTree = "navtree",
-        NavTreeFull = "navtree-full",
-        /** @deprecated */
-        Occurrences = "occurrences",
-        DocumentHighlights = "documentHighlights",
-        Open = "open",
-        Quickinfo = "quickinfo",
-        References = "references",
-        Reload = "reload",
-        Rename = "rename",
-        Saveto = "saveto",
-        SignatureHelp = "signatureHelp",
-        Status = "status",
-        TypeDefinition = "typeDefinition",
-        ProjectInfo = "projectInfo",
-        ReloadProjects = "reloadProjects",
-        Unknown = "unknown",
-        OpenExternalProject = "openExternalProject",
-        OpenExternalProjects = "openExternalProjects",
-        CloseExternalProject = "closeExternalProject",
-        GetOutliningSpans = "getOutliningSpans",
-        TodoComments = "todoComments",
-        Indentation = "indentation",
-        DocCommentTemplate = "docCommentTemplate",
-        CompilerOptionsForInferredProjects = "compilerOptionsForInferredProjects",
-        GetCodeFixes = "getCodeFixes",
-        GetCombinedCodeFix = "getCombinedCodeFix",
-        ApplyCodeActionCommand = "applyCodeActionCommand",
-        GetSupportedCodeFixes = "getSupportedCodeFixes",
-        GetApplicableRefactors = "getApplicableRefactors",
-        GetEditsForRefactor = "getEditsForRefactor",
-        OrganizeImports = "organizeImports",
-        GetEditsForFileRename = "getEditsForFileRename"
-    }
-    /**
-     * A TypeScript Server message
-     */
-    interface Message {
-        /**
-         * Sequence number of the message
-         */
-        seq: number;
-        /**
-         * One of "request", "response", or "event"
-         */
-        type: "request" | "response" | "event";
-    }
-    /**
-     * Client-initiated request message
-     */
-    interface Request extends Message {
-        type: "request";
-        /**
-         * The command to execute
-         */
-        command: string;
-        /**
-         * Object containing arguments for the command
-         */
-        arguments?: any;
-    }
-    /**
-     * Request to reload the project structure for all the opened files
-     */
-    interface ReloadProjectsRequest extends Message {
-        command: CommandTypes.ReloadProjects;
-    }
-    /**
-     * Server-initiated event message
-     */
-    interface Event extends Message {
-        type: "event";
-        /**
-         * Name of event
-         */
-        event: string;
-        /**
-         * Event-specific information
-         */
-        body?: any;
-    }
-    /**
-     * Response by server to client request message.
-     */
-    interface Response extends Message {
-        type: "response";
-        /**
-         * Sequence number of the request message.
-         */
-        request_seq: number;
-        /**
-         * Outcome of the request.
-         */
-        success: boolean;
-        /**
-         * The command requested.
-         */
-        command: string;
-        /**
-         * If success === false, this should always be provided.
-         * Otherwise, may (or may not) contain a success message.
-         */
-        message?: string;
-        /**
-         * Contains message body if success === true.
-         */
-        body?: any;
-    }
-    /**
-     * Arguments for FileRequest messages.
-     */
-    interface FileRequestArgs {
-        /**
-         * The file for the request (absolute pathname required).
-         */
-        file: string;
-        projectFileName?: string;
-    }
-    interface StatusRequest extends Request {
-        command: CommandTypes.Status;
-    }
-    interface StatusResponseBody {
-        /**
-         * The TypeScript version (`ts.version`).
-         */
-        version: string;
-    }
-    /**
-     * Response to StatusRequest
-     */
-    interface StatusResponse extends Response {
-        body: StatusResponseBody;
-    }
-    /**
-     * Requests a JS Doc comment template for a given position
-     */
-    interface DocCommentTemplateRequest extends FileLocationRequest {
-        command: CommandTypes.DocCommentTemplate;
-    }
-    /**
-     * Response to DocCommentTemplateRequest
-     */
-    interface DocCommandTemplateResponse extends Response {
-        body?: TextInsertion;
-    }
-    /**
-     * A request to get TODO comments from the file
-     */
-    interface TodoCommentRequest extends FileRequest {
-        command: CommandTypes.TodoComments;
-        arguments: TodoCommentRequestArgs;
-    }
-    /**
-     * Arguments for TodoCommentRequest request.
-     */
-    interface TodoCommentRequestArgs extends FileRequestArgs {
-        /**
-         * Array of target TodoCommentDescriptors that describes TODO comments to be found
-         */
-        descriptors: TodoCommentDescriptor[];
-    }
-    /**
-     * Response for TodoCommentRequest request.
-     */
-    interface TodoCommentsResponse extends Response {
-        body?: TodoComment[];
-    }
-    /**
-     * A request to determine if the caret is inside a comment.
-     */
-    interface SpanOfEnclosingCommentRequest extends FileLocationRequest {
-        command: CommandTypes.GetSpanOfEnclosingComment;
-        arguments: SpanOfEnclosingCommentRequestArgs;
-    }
-    interface SpanOfEnclosingCommentRequestArgs extends FileLocationRequestArgs {
-        /**
-         * Requires that the enclosing span be a multi-line comment, or else the request returns undefined.
-         */
-        onlyMultiLine: boolean;
-    }
-    /**
-     * Request to obtain outlining spans in file.
-     */
-    interface OutliningSpansRequest extends FileRequest {
-        command: CommandTypes.GetOutliningSpans;
-    }
-    interface OutliningSpan {
-        /** The span of the document to actually collapse. */
-        textSpan: TextSpan;
-        /** The span of the document to display when the user hovers over the collapsed span. */
-        hintSpan: TextSpan;
-        /** The text to display in the editor for the collapsed region. */
-        bannerText: string;
-        /**
-         * Whether or not this region should be automatically collapsed when
-         * the 'Collapse to Definitions' command is invoked.
-         */
-        autoCollapse: boolean;
-        /**
-         * Classification of the contents of the span
-         */
-        kind: OutliningSpanKind;
-    }
-    /**
-     * Response to OutliningSpansRequest request.
-     */
-    interface OutliningSpansResponse extends Response {
-        body?: OutliningSpan[];
-    }
-    /**
-     * A request to get indentation for a location in file
-     */
-    interface IndentationRequest extends FileLocationRequest {
-        command: CommandTypes.Indentation;
-        arguments: IndentationRequestArgs;
-    }
-    /**
-     * Response for IndentationRequest request.
-     */
-    interface IndentationResponse extends Response {
-        body?: IndentationResult;
-    }
-    /**
-     * Indentation result representing where indentation should be placed
-     */
-    interface IndentationResult {
-        /**
-         * The base position in the document that the indent should be relative to
-         */
-        position: number;
-        /**
-         * The number of columns the indent should be at relative to the position's column.
-         */
-        indentation: number;
-    }
-    /**
-     * Arguments for IndentationRequest request.
-     */
-    interface IndentationRequestArgs extends FileLocationRequestArgs {
-        /**
-         * An optional set of settings to be used when computing indentation.
-         * If argument is omitted - then it will use settings for file that were previously set via 'configure' request or global settings.
-         */
-        options?: EditorSettings;
-    }
-    /**
-     * Arguments for ProjectInfoRequest request.
-     */
-    interface ProjectInfoRequestArgs extends FileRequestArgs {
-        /**
-         * Indicate if the file name list of the project is needed
-         */
-        needFileNameList: boolean;
-    }
-    /**
-     * A request to get the project information of the current file.
-     */
-    interface ProjectInfoRequest extends Request {
-        command: CommandTypes.ProjectInfo;
-        arguments: ProjectInfoRequestArgs;
-    }
-    /**
-     * A request to retrieve compiler options diagnostics for a project
-     */
-    interface CompilerOptionsDiagnosticsRequest extends Request {
-        arguments: CompilerOptionsDiagnosticsRequestArgs;
-    }
-    /**
-     * Arguments for CompilerOptionsDiagnosticsRequest request.
-     */
-    interface CompilerOptionsDiagnosticsRequestArgs {
-        /**
-         * Name of the project to retrieve compiler options diagnostics.
-         */
-        projectFileName: string;
-    }
-    /**
-     * Response message body for "projectInfo" request
-     */
-    interface ProjectInfo {
-        /**
-         * For configured project, this is the normalized path of the 'tsconfig.json' file
-         * For inferred project, this is undefined
-         */
-        configFileName: string;
-        /**
-         * The list of normalized file name in the project, including 'lib.d.ts'
-         */
-        fileNames?: string[];
-        /**
-         * Indicates if the project has a active language service instance
-         */
-        languageServiceDisabled?: boolean;
-    }
-    /**
-     * Represents diagnostic info that includes location of diagnostic in two forms
-     * - start position and length of the error span
-     * - startLocation and endLocation - a pair of Location objects that store start/end line and offset of the error span.
-     */
-    interface DiagnosticWithLinePosition {
-        message: string;
-        start: number;
-        length: number;
-        startLocation: Location;
-        endLocation: Location;
-        category: string;
-        code: number;
-        /** May store more in future. For now, this will simply be `true` to indicate when a diagnostic is an unused-identifier diagnostic. */
-        reportsUnnecessary?: {};
-    }
-    /**
-     * Response message for "projectInfo" request
-     */
-    interface ProjectInfoResponse extends Response {
-        body?: ProjectInfo;
-    }
-    /**
-     * Request whose sole parameter is a file name.
-     */
-    interface FileRequest extends Request {
-        arguments: FileRequestArgs;
-    }
-    /**
-     * Instances of this interface specify a location in a source file:
-     * (file, line, character offset), where line and character offset are 1-based.
-     */
-    interface FileLocationRequestArgs extends FileRequestArgs {
-        /**
-         * The line number for the request (1-based).
-         */
-        line: number;
-        /**
-         * The character offset (on the line) for the request (1-based).
-         */
-        offset: number;
-    }
-    type FileLocationOrRangeRequestArgs = FileLocationRequestArgs | FileRangeRequestArgs;
-    /**
-     * Request refactorings at a given position or selection area.
-     */
-    interface GetApplicableRefactorsRequest extends Request {
-        command: CommandTypes.GetApplicableRefactors;
-        arguments: GetApplicableRefactorsRequestArgs;
-    }
-    type GetApplicableRefactorsRequestArgs = FileLocationOrRangeRequestArgs;
-    /**
-     * Response is a list of available refactorings.
-     * Each refactoring exposes one or more "Actions"; a user selects one action to invoke a refactoring
-     */
-    interface GetApplicableRefactorsResponse extends Response {
-        body?: ApplicableRefactorInfo[];
-    }
-    /**
-     * A set of one or more available refactoring actions, grouped under a parent refactoring.
-     */
-    interface ApplicableRefactorInfo {
-        /**
-         * The programmatic name of the refactoring
-         */
-        name: string;
-        /**
-         * A description of this refactoring category to show to the user.
-         * If the refactoring gets inlined (see below), this text will not be visible.
-         */
-        description: string;
-        /**
-         * Inlineable refactorings can have their actions hoisted out to the top level
-         * of a context menu. Non-inlineanable refactorings should always be shown inside
-         * their parent grouping.
-         *
-         * If not specified, this value is assumed to be 'true'
-         */
-        inlineable?: boolean;
-        actions: RefactorActionInfo[];
-    }
-    /**
-     * Represents a single refactoring action - for example, the "Extract Method..." refactor might
-     * offer several actions, each corresponding to a surround class or closure to extract into.
-     */
-    interface RefactorActionInfo {
-        /**
-         * The programmatic name of the refactoring action
-         */
-        name: string;
-        /**
-         * A description of this refactoring action to show to the user.
-         * If the parent refactoring is inlined away, this will be the only text shown,
-         * so this description should make sense by itself if the parent is inlineable=true
-         */
-        description: string;
-    }
-    interface GetEditsForRefactorRequest extends Request {
-        command: CommandTypes.GetEditsForRefactor;
-        arguments: GetEditsForRefactorRequestArgs;
-    }
-    /**
-     * Request the edits that a particular refactoring action produces.
-     * Callers must specify the name of the refactor and the name of the action.
-     */
-    type GetEditsForRefactorRequestArgs = FileLocationOrRangeRequestArgs & {
-        refactor: string;
-        action: string;
-    };
-    interface GetEditsForRefactorResponse extends Response {
-        body?: RefactorEditInfo;
-    }
-    interface RefactorEditInfo {
-        edits: FileCodeEdits[];
-        /**
-         * An optional location where the editor should start a rename operation once
-         * the refactoring edits have been applied
-         */
-        renameLocation?: Location;
-        renameFilename?: string;
-    }
-    /**
-     * Organize imports by:
-     *   1) Removing unused imports
-     *   2) Coalescing imports from the same module
-     *   3) Sorting imports
-     */
-    interface OrganizeImportsRequest extends Request {
-        command: CommandTypes.OrganizeImports;
-        arguments: OrganizeImportsRequestArgs;
-    }
-    type OrganizeImportsScope = GetCombinedCodeFixScope;
-    interface OrganizeImportsRequestArgs {
-        scope: OrganizeImportsScope;
-    }
-    interface OrganizeImportsResponse extends Response {
-        edits: ReadonlyArray<FileCodeEdits>;
-    }
-    interface GetEditsForFileRenameRequest extends Request {
-        command: CommandTypes.GetEditsForFileRename;
-        arguments: GetEditsForFileRenameRequestArgs;
-    }
-    interface GetEditsForFileRenameRequestArgs extends FileRequestArgs {
-        readonly oldFilePath: string;
-        readonly newFilePath: string;
-    }
-    interface GetEditsForFileRenameResponse extends Response {
-        edits: ReadonlyArray<FileCodeEdits>;
-    }
-    /**
-     * Request for the available codefixes at a specific position.
-     */
-    interface CodeFixRequest extends Request {
-        command: CommandTypes.GetCodeFixes;
-        arguments: CodeFixRequestArgs;
-    }
-    interface GetCombinedCodeFixRequest extends Request {
-        command: CommandTypes.GetCombinedCodeFix;
-        arguments: GetCombinedCodeFixRequestArgs;
-    }
-    interface GetCombinedCodeFixResponse extends Response {
-        body: CombinedCodeActions;
-    }
-    interface ApplyCodeActionCommandRequest extends Request {
-        command: CommandTypes.ApplyCodeActionCommand;
-        arguments: ApplyCodeActionCommandRequestArgs;
-    }
-    interface ApplyCodeActionCommandResponse extends Response {
-    }
-    interface FileRangeRequestArgs extends FileRequestArgs {
-        /**
-         * The line number for the request (1-based).
-         */
-        startLine: number;
-        /**
-         * The character offset (on the line) for the request (1-based).
-         */
-        startOffset: number;
-        /**
-         * The line number for the request (1-based).
-         */
-        endLine: number;
-        /**
-         * The character offset (on the line) for the request (1-based).
-         */
-        endOffset: number;
-    }
-    /**
-     * Instances of this interface specify errorcodes on a specific location in a sourcefile.
-     */
-    interface CodeFixRequestArgs extends FileRangeRequestArgs {
-        /**
-         * Errorcodes we want to get the fixes for.
-         */
-        errorCodes?: ReadonlyArray<number>;
-    }
-    interface GetCombinedCodeFixRequestArgs {
-        scope: GetCombinedCodeFixScope;
-        fixId: {};
-    }
-    interface GetCombinedCodeFixScope {
-        type: "file";
-        args: FileRequestArgs;
-    }
-    interface ApplyCodeActionCommandRequestArgs {
-        /** May also be an array of commands. */
-        command: {};
-    }
-    /**
-     * Response for GetCodeFixes request.
-     */
-    interface GetCodeFixesResponse extends Response {
-        body?: CodeAction[];
-    }
-    /**
-     * A request whose arguments specify a file location (file, line, col).
-     */
-    interface FileLocationRequest extends FileRequest {
-        arguments: FileLocationRequestArgs;
-    }
-    /**
-     * A request to get codes of supported code fixes.
-     */
-    interface GetSupportedCodeFixesRequest extends Request {
-        command: CommandTypes.GetSupportedCodeFixes;
-    }
-    /**
-     * A response for GetSupportedCodeFixesRequest request.
-     */
-    interface GetSupportedCodeFixesResponse extends Response {
-        /**
-         * List of error codes supported by the server.
-         */
-        body?: string[];
-    }
-    /**
-     * Arguments for EncodedSemanticClassificationsRequest request.
-     */
-    interface EncodedSemanticClassificationsRequestArgs extends FileRequestArgs {
-        /**
-         * Start position of the span.
-         */
-        start: number;
-        /**
-         * Length of the span.
-         */
-        length: number;
-    }
-    /**
-     * Arguments in document highlight request; include: filesToSearch, file,
-     * line, offset.
-     */
-    interface DocumentHighlightsRequestArgs extends FileLocationRequestArgs {
-        /**
-         * List of files to search for document highlights.
-         */
-        filesToSearch: string[];
-    }
-    /**
-     * Go to definition request; value of command field is
-     * "definition". Return response giving the file locations that
-     * define the symbol found in file at location line, col.
-     */
-    interface DefinitionRequest extends FileLocationRequest {
-        command: CommandTypes.Definition;
-    }
-    /**
-     * Go to type request; value of command field is
-     * "typeDefinition". Return response giving the file locations that
-     * define the type for the symbol found in file at location line, col.
-     */
-    interface TypeDefinitionRequest extends FileLocationRequest {
-        command: CommandTypes.TypeDefinition;
-    }
-    /**
-     * Go to implementation request; value of command field is
-     * "implementation". Return response giving the file locations that
-     * implement the symbol found in file at location line, col.
-     */
-    interface ImplementationRequest extends FileLocationRequest {
-        command: CommandTypes.Implementation;
-    }
-    /**
-     * Location in source code expressed as (one-based) line and (one-based) column offset.
-     */
-    interface Location {
-        line: number;
-        offset: number;
-    }
-    /**
-     * Object found in response messages defining a span of text in source code.
-     */
-    interface TextSpan {
-        /**
-         * First character of the definition.
-         */
-        start: Location;
-        /**
-         * One character past last character of the definition.
-         */
-        end: Location;
-    }
-    /**
-     * Object found in response messages defining a span of text in a specific source file.
-     */
-    interface FileSpan extends TextSpan {
-        /**
-         * File containing text span.
-         */
-        file: string;
-    }
-    interface DefinitionInfoAndBoundSpan {
-        definitions: ReadonlyArray<FileSpan>;
-        textSpan: TextSpan;
-    }
-    /**
-     * Definition response message.  Gives text range for definition.
-     */
-    interface DefinitionResponse extends Response {
-        body?: FileSpan[];
-    }
-    interface DefinitionInfoAndBoundSpanReponse extends Response {
-        body?: DefinitionInfoAndBoundSpan;
-    }
-    /**
-     * Definition response message.  Gives text range for definition.
-     */
-    interface TypeDefinitionResponse extends Response {
-        body?: FileSpan[];
-    }
-    /**
-     * Implementation response message.  Gives text range for implementations.
-     */
-    interface ImplementationResponse extends Response {
-        body?: FileSpan[];
-    }
-    /**
-     * Request to get brace completion for a location in the file.
-     */
-    interface BraceCompletionRequest extends FileLocationRequest {
-        command: CommandTypes.BraceCompletion;
-        arguments: BraceCompletionRequestArgs;
-    }
-    /**
-     * Argument for BraceCompletionRequest request.
-     */
-    interface BraceCompletionRequestArgs extends FileLocationRequestArgs {
-        /**
-         * Kind of opening brace
-         */
-        openingBrace: string;
-    }
-    interface JsxClosingTagRequest extends FileLocationRequest {
-        readonly command: CommandTypes.JsxClosingTag;
-        readonly arguments: JsxClosingTagRequestArgs;
-    }
-    interface JsxClosingTagRequestArgs extends FileLocationRequestArgs {
-    }
-    interface JsxClosingTagResponse extends Response {
-        readonly body: TextInsertion;
-    }
-    /**
-     * @deprecated
-     * Get occurrences request; value of command field is
-     * "occurrences". Return response giving spans that are relevant
-     * in the file at a given line and column.
-     */
-    interface OccurrencesRequest extends FileLocationRequest {
-        command: CommandTypes.Occurrences;
-    }
-    /** @deprecated */
-    interface OccurrencesResponseItem extends FileSpan {
-        /**
-         * True if the occurrence is a write location, false otherwise.
-         */
-        isWriteAccess: boolean;
-        /**
-         * True if the occurrence is in a string, undefined otherwise;
-         */
-        isInString?: true;
-    }
-    /** @deprecated */
-    interface OccurrencesResponse extends Response {
-        body?: OccurrencesResponseItem[];
-    }
-    /**
-     * Get document highlights request; value of command field is
-     * "documentHighlights". Return response giving spans that are relevant
-     * in the file at a given line and column.
-     */
-    interface DocumentHighlightsRequest extends FileLocationRequest {
-        command: CommandTypes.DocumentHighlights;
-        arguments: DocumentHighlightsRequestArgs;
-    }
-    /**
-     * Span augmented with extra information that denotes the kind of the highlighting to be used for span.
-     */
-    interface HighlightSpan extends TextSpan {
-        kind: HighlightSpanKind;
-    }
-    /**
-     * Represents a set of highligh spans for a give name
-     */
-    interface DocumentHighlightsItem {
-        /**
-         * File containing highlight spans.
-         */
-        file: string;
-        /**
-         * Spans to highlight in file.
-         */
-        highlightSpans: HighlightSpan[];
-    }
-    /**
-     * Response for a DocumentHighlightsRequest request.
-     */
-    interface DocumentHighlightsResponse extends Response {
-        body?: DocumentHighlightsItem[];
-    }
-    /**
-     * Find references request; value of command field is
-     * "references". Return response giving the file locations that
-     * reference the symbol found in file at location line, col.
-     */
-    interface ReferencesRequest extends FileLocationRequest {
-        command: CommandTypes.References;
-    }
-    interface ReferencesResponseItem extends FileSpan {
-        /** Text of line containing the reference.  Including this
-         *  with the response avoids latency of editor loading files
-         * to show text of reference line (the server already has
-         * loaded the referencing files).
-         */
-        lineText: string;
-        /**
-         * True if reference is a write location, false otherwise.
-         */
-        isWriteAccess: boolean;
-        /**
-         * True if reference is a definition, false otherwise.
-         */
-        isDefinition: boolean;
-    }
-    /**
-     * The body of a "references" response message.
-     */
-    interface ReferencesResponseBody {
-        /**
-         * The file locations referencing the symbol.
-         */
-        refs: ReferencesResponseItem[];
-        /**
-         * The name of the symbol.
-         */
-        symbolName: string;
-        /**
-         * The start character offset of the symbol (on the line provided by the references request).
-         */
-        symbolStartOffset: number;
-        /**
-         * The full display name of the symbol.
-         */
-        symbolDisplayString: string;
-    }
-    /**
-     * Response to "references" request.
-     */
-    interface ReferencesResponse extends Response {
-        body?: ReferencesResponseBody;
-    }
-    /**
-     * Argument for RenameRequest request.
-     */
-    interface RenameRequestArgs extends FileLocationRequestArgs {
-        /**
-         * Should text at specified location be found/changed in comments?
-         */
-        findInComments?: boolean;
-        /**
-         * Should text at specified location be found/changed in strings?
-         */
-        findInStrings?: boolean;
-    }
-    /**
-     * Rename request; value of command field is "rename". Return
-     * response giving the file locations that reference the symbol
-     * found in file at location line, col. Also return full display
-     * name of the symbol so that client can print it unambiguously.
-     */
-    interface RenameRequest extends FileLocationRequest {
-        command: CommandTypes.Rename;
-        arguments: RenameRequestArgs;
-    }
-    /**
-     * Information about the item to be renamed.
-     */
-    interface RenameInfo {
-        /**
-         * True if item can be renamed.
-         */
-        canRename: boolean;
-        /**
-         * Error message if item can not be renamed.
-         */
-        localizedErrorMessage?: string;
-        /**
-         * Display name of the item to be renamed.
-         */
-        displayName: string;
-        /**
-         * Full display name of item to be renamed.
-         */
-        fullDisplayName: string;
-        /**
-         * The items's kind (such as 'className' or 'parameterName' or plain 'text').
-         */
-        kind: ScriptElementKind;
-        /**
-         * Optional modifiers for the kind (such as 'public').
-         */
-        kindModifiers: string;
-    }
-    /**
-     *  A group of text spans, all in 'file'.
-     */
-    interface SpanGroup {
-        /** The file to which the spans apply */
-        file: string;
-        /** The text spans in this group */
-        locs: TextSpan[];
-    }
-    interface RenameResponseBody {
-        /**
-         * Information about the item to be renamed.
-         */
-        info: RenameInfo;
-        /**
-         * An array of span groups (one per file) that refer to the item to be renamed.
-         */
-        locs: ReadonlyArray<SpanGroup>;
-    }
-    /**
-     * Rename response message.
-     */
-    interface RenameResponse extends Response {
-        body?: RenameResponseBody;
-    }
-    /**
-     * Represents a file in external project.
-     * External project is project whose set of files, compilation options and open\close state
-     * is maintained by the client (i.e. if all this data come from .csproj file in Visual Studio).
-     * External project will exist even if all files in it are closed and should be closed explicitly.
-     * If external project includes one or more tsconfig.json/jsconfig.json files then tsserver will
-     * create configured project for every config file but will maintain a link that these projects were created
-     * as a result of opening external project so they should be removed once external project is closed.
-     */
-    interface ExternalFile {
-        /**
-         * Name of file file
-         */
-        fileName: string;
-        /**
-         * Script kind of the file
-         */
-        scriptKind?: ScriptKindName | ts.ScriptKind;
-        /**
-         * Whether file has mixed content (i.e. .cshtml file that combines html markup with C#/JavaScript)
-         */
-        hasMixedContent?: boolean;
-        /**
-         * Content of the file
-         */
-        content?: string;
-    }
-    /**
-     * Represent an external project
-     */
-    interface ExternalProject {
-        /**
-         * Project name
-         */
-        projectFileName: string;
-        /**
-         * List of root files in project
-         */
-        rootFiles: ExternalFile[];
-        /**
-         * Compiler options for the project
-         */
-        options: ExternalProjectCompilerOptions;
-        /**
-         * @deprecated typingOptions. Use typeAcquisition instead
-         */
-        typingOptions?: TypeAcquisition;
-        /**
-         * Explicitly specified type acquisition for the project
-         */
-        typeAcquisition?: TypeAcquisition;
-    }
-    interface CompileOnSaveMixin {
-        /**
-         * If compile on save is enabled for the project
-         */
-        compileOnSave?: boolean;
-    }
-    /**
-     * For external projects, some of the project settings are sent together with
-     * compiler settings.
-     */
-    type ExternalProjectCompilerOptions = CompilerOptions & CompileOnSaveMixin;
-    /**
-     * Represents a set of changes that happen in project
-     */
-    interface ProjectChanges {
-        /**
-         * List of added files
-         */
-        added: string[];
-        /**
-         * List of removed files
-         */
-        removed: string[];
-        /**
-         * List of updated files
-         */
-        updated: string[];
-    }
-    /**
-     * Information found in a configure request.
-     */
-    interface ConfigureRequestArguments {
-        /**
-         * Information about the host, for example 'Emacs 24.4' or
-         * 'Sublime Text version 3075'
-         */
-        hostInfo?: string;
-        /**
-         * If present, tab settings apply only to this file.
-         */
-        file?: string;
-        /**
-         * The format options to use during formatting and other code editing features.
-         */
-        formatOptions?: FormatCodeSettings;
-        preferences?: UserPreferences;
-        /**
-         * The host's additional supported .js file extensions
-         */
-        extraFileExtensions?: FileExtensionInfo[];
-    }
-    /**
-     *  Configure request; value of command field is "configure".  Specifies
-     *  host information, such as host type, tab size, and indent size.
-     */
-    interface ConfigureRequest extends Request {
-        command: CommandTypes.Configure;
-        arguments: ConfigureRequestArguments;
-    }
-    /**
-     * Response to "configure" request.  This is just an acknowledgement, so
-     * no body field is required.
-     */
-    interface ConfigureResponse extends Response {
-    }
-    /**
-     *  Information found in an "open" request.
-     */
-    interface OpenRequestArgs extends FileRequestArgs {
-        /**
-         * Used when a version of the file content is known to be more up to date than the one on disk.
-         * Then the known content will be used upon opening instead of the disk copy
-         */
-        fileContent?: string;
-        /**
-         * Used to specify the script kind of the file explicitly. It could be one of the following:
-         *      "TS", "JS", "TSX", "JSX"
-         */
-        scriptKindName?: ScriptKindName;
-        /**
-         * Used to limit the searching for project config file. If given the searching will stop at this
-         * root path; otherwise it will go all the way up to the dist root path.
-         */
-        projectRootPath?: string;
-    }
-    type ScriptKindName = "TS" | "JS" | "TSX" | "JSX";
-    /**
-     * Open request; value of command field is "open". Notify the
-     * server that the client has file open.  The server will not
-     * monitor the filesystem for changes in this file and will assume
-     * that the client is updating the server (using the change and/or
-     * reload messages) when the file changes. Server does not currently
-     * send a response to an open request.
-     */
-    interface OpenRequest extends Request {
-        command: CommandTypes.Open;
-        arguments: OpenRequestArgs;
-    }
-    /**
-     * Request to open or update external project
-     */
-    interface OpenExternalProjectRequest extends Request {
-        command: CommandTypes.OpenExternalProject;
-        arguments: OpenExternalProjectArgs;
-    }
-    /**
-     * Arguments to OpenExternalProjectRequest request
-     */
-    type OpenExternalProjectArgs = ExternalProject;
-    /**
-     * Request to open multiple external projects
-     */
-    interface OpenExternalProjectsRequest extends Request {
-        command: CommandTypes.OpenExternalProjects;
-        arguments: OpenExternalProjectsArgs;
-    }
-    /**
-     * Arguments to OpenExternalProjectsRequest
-     */
-    interface OpenExternalProjectsArgs {
-        /**
-         * List of external projects to open or update
-         */
-        projects: ExternalProject[];
-    }
-    /**
-     * Response to OpenExternalProjectRequest request. This is just an acknowledgement, so
-     * no body field is required.
-     */
-    interface OpenExternalProjectResponse extends Response {
-    }
-    /**
-     * Response to OpenExternalProjectsRequest request. This is just an acknowledgement, so
-     * no body field is required.
-     */
-    interface OpenExternalProjectsResponse extends Response {
-    }
-    /**
-     * Request to close external project.
-     */
-    interface CloseExternalProjectRequest extends Request {
-        command: CommandTypes.CloseExternalProject;
-        arguments: CloseExternalProjectRequestArgs;
-    }
-    /**
-     * Arguments to CloseExternalProjectRequest request
-     */
-    interface CloseExternalProjectRequestArgs {
-        /**
-         * Name of the project to close
-         */
-        projectFileName: string;
-    }
-    /**
-     * Response to CloseExternalProjectRequest request. This is just an acknowledgement, so
-     * no body field is required.
-     */
-    interface CloseExternalProjectResponse extends Response {
-    }
-    /**
-     * Request to set compiler options for inferred projects.
-     * External projects are opened / closed explicitly.
-     * Configured projects are opened when user opens loose file that has 'tsconfig.json' or 'jsconfig.json' anywhere in one of containing folders.
-     * This configuration file will be used to obtain a list of files and configuration settings for the project.
-     * Inferred projects are created when user opens a loose file that is not the part of external project
-     * or configured project and will contain only open file and transitive closure of referenced files if 'useOneInferredProject' is false,
-     * or all open loose files and its transitive closure of referenced files if 'useOneInferredProject' is true.
-     */
-    interface SetCompilerOptionsForInferredProjectsRequest extends Request {
-        command: CommandTypes.CompilerOptionsForInferredProjects;
-        arguments: SetCompilerOptionsForInferredProjectsArgs;
-    }
-    /**
-     * Argument for SetCompilerOptionsForInferredProjectsRequest request.
-     */
-    interface SetCompilerOptionsForInferredProjectsArgs {
-        /**
-         * Compiler options to be used with inferred projects.
-         */
-        options: ExternalProjectCompilerOptions;
-        /**
-         * Specifies the project root path used to scope compiler options.
-         * It is an error to provide this property if the server has not been started with
-         * `useInferredProjectPerProjectRoot` enabled.
-         */
-        projectRootPath?: string;
-    }
-    /**
-     * Response to SetCompilerOptionsForInferredProjectsResponse request. This is just an acknowledgement, so
-     * no body field is required.
-     */
-    interface SetCompilerOptionsForInferredProjectsResponse extends Response {
-    }
-    /**
-     *  Exit request; value of command field is "exit".  Ask the server process
-     *  to exit.
-     */
-    interface ExitRequest extends Request {
-        command: CommandTypes.Exit;
-    }
-    /**
-     * Close request; value of command field is "close". Notify the
-     * server that the client has closed a previously open file.  If
-     * file is still referenced by open files, the server will resume
-     * monitoring the filesystem for changes to file.  Server does not
-     * currently send a response to a close request.
-     */
-    interface CloseRequest extends FileRequest {
-        command: CommandTypes.Close;
-    }
-    /**
-     * Request to obtain the list of files that should be regenerated if target file is recompiled.
-     * NOTE: this us query-only operation and does not generate any output on disk.
-     */
-    interface CompileOnSaveAffectedFileListRequest extends FileRequest {
-        command: CommandTypes.CompileOnSaveAffectedFileList;
-    }
-    /**
-     * Contains a list of files that should be regenerated in a project
-     */
-    interface CompileOnSaveAffectedFileListSingleProject {
-        /**
-         * Project name
-         */
-        projectFileName: string;
-        /**
-         * List of files names that should be recompiled
-         */
-        fileNames: string[];
-        /**
-         * true if project uses outFile or out compiler option
-         */
-        projectUsesOutFile: boolean;
-    }
-    /**
-     * Response for CompileOnSaveAffectedFileListRequest request;
-     */
-    interface CompileOnSaveAffectedFileListResponse extends Response {
-        body: CompileOnSaveAffectedFileListSingleProject[];
-    }
-    /**
-     * Request to recompile the file. All generated outputs (.js, .d.ts or .js.map files) is written on disk.
-     */
-    interface CompileOnSaveEmitFileRequest extends FileRequest {
-        command: CommandTypes.CompileOnSaveEmitFile;
-        arguments: CompileOnSaveEmitFileRequestArgs;
-    }
-    /**
-     * Arguments for CompileOnSaveEmitFileRequest
-     */
-    interface CompileOnSaveEmitFileRequestArgs extends FileRequestArgs {
-        /**
-         * if true - then file should be recompiled even if it does not have any changes.
-         */
-        forced?: boolean;
-    }
-    /**
-     * Quickinfo request; value of command field is
-     * "quickinfo". Return response giving a quick type and
-     * documentation string for the symbol found in file at location
-     * line, col.
-     */
-    interface QuickInfoRequest extends FileLocationRequest {
-        command: CommandTypes.Quickinfo;
-    }
-    /**
-     * Body of QuickInfoResponse.
-     */
-    interface QuickInfoResponseBody {
-        /**
-         * The symbol's kind (such as 'className' or 'parameterName' or plain 'text').
-         */
-        kind: ScriptElementKind;
-        /**
-         * Optional modifiers for the kind (such as 'public').
-         */
-        kindModifiers: string;
-        /**
-         * Starting file location of symbol.
-         */
-        start: Location;
-        /**
-         * One past last character of symbol.
-         */
-        end: Location;
-        /**
-         * Type and kind of symbol.
-         */
-        displayString: string;
-        /**
-         * Documentation associated with symbol.
-         */
-        documentation: string;
-        /**
-         * JSDoc tags associated with symbol.
-         */
-        tags: JSDocTagInfo[];
-    }
-    /**
-     * Quickinfo response message.
-     */
-    interface QuickInfoResponse extends Response {
-        body?: QuickInfoResponseBody;
-    }
-    /**
-     * Arguments for format messages.
-     */
-    interface FormatRequestArgs extends FileLocationRequestArgs {
-        /**
-         * Last line of range for which to format text in file.
-         */
-        endLine: number;
-        /**
-         * Character offset on last line of range for which to format text in file.
-         */
-        endOffset: number;
-        /**
-         * Format options to be used.
-         */
-        options?: FormatCodeSettings;
-    }
-    /**
-     * Format request; value of command field is "format".  Return
-     * response giving zero or more edit instructions.  The edit
-     * instructions will be sorted in file order.  Applying the edit
-     * instructions in reverse to file will result in correctly
-     * reformatted text.
-     */
-    interface FormatRequest extends FileLocationRequest {
-        command: CommandTypes.Format;
-        arguments: FormatRequestArgs;
-    }
-    /**
-     * Object found in response messages defining an editing
-     * instruction for a span of text in source code.  The effect of
-     * this instruction is to replace the text starting at start and
-     * ending one character before end with newText. For an insertion,
-     * the text span is empty.  For a deletion, newText is empty.
-     */
-    interface CodeEdit {
-        /**
-         * First character of the text span to edit.
-         */
-        start: Location;
-        /**
-         * One character past last character of the text span to edit.
-         */
-        end: Location;
-        /**
-         * Replace the span defined above with this string (may be
-         * the empty string).
-         */
-        newText: string;
-    }
-    interface FileCodeEdits {
-        fileName: string;
-        textChanges: CodeEdit[];
-    }
-    interface CodeFixResponse extends Response {
-        /** The code actions that are available */
-        body?: CodeFixAction[];
-    }
-    interface CodeAction {
-        /** Description of the code action to display in the UI of the editor */
-        description: string;
-        /** Text changes to apply to each file as part of the code action */
-        changes: FileCodeEdits[];
-        /** A command is an opaque object that should be passed to `ApplyCodeActionCommandRequestArgs` without modification.  */
-        commands?: {}[];
-    }
-    interface CombinedCodeActions {
-        changes: ReadonlyArray<FileCodeEdits>;
-        commands?: ReadonlyArray<{}>;
-    }
-    interface CodeFixAction extends CodeAction {
-        /** Short name to identify the fix, for use by telemetry. */
-        fixName: string;
-        /**
-         * If present, one may call 'getCombinedCodeFix' with this fixId.
-         * This may be omitted to indicate that the code fix can't be applied in a group.
-         */
-        fixId?: {};
-        /** Should be present if and only if 'fixId' is. */
-        fixAllDescription?: string;
-    }
-    /**
-     * Format and format on key response message.
-     */
-    interface FormatResponse extends Response {
-        body?: CodeEdit[];
-    }
-    /**
-     * Arguments for format on key messages.
-     */
-    interface FormatOnKeyRequestArgs extends FileLocationRequestArgs {
-        /**
-         * Key pressed (';', '\n', or '}').
-         */
-        key: string;
-        options?: FormatCodeSettings;
-    }
-    /**
-     * Format on key request; value of command field is
-     * "formatonkey". Given file location and key typed (as string),
-     * return response giving zero or more edit instructions.  The
-     * edit instructions will be sorted in file order.  Applying the
-     * edit instructions in reverse to file will result in correctly
-     * reformatted text.
-     */
-    interface FormatOnKeyRequest extends FileLocationRequest {
-        command: CommandTypes.Formatonkey;
-        arguments: FormatOnKeyRequestArgs;
-    }
-    type CompletionsTriggerCharacter = "." | '"' | "'" | "`" | "/" | "@" | "<";
-    /**
-     * Arguments for completions messages.
-     */
-    interface CompletionsRequestArgs extends FileLocationRequestArgs {
-        /**
-         * Optional prefix to apply to possible completions.
-         */
-        prefix?: string;
-        triggerCharacter?: CompletionsTriggerCharacter;
-        /**
-         * @deprecated Use UserPreferences.includeCompletionsForModuleExports
-         */
-        includeExternalModuleExports?: boolean;
-        /**
-         * @deprecated Use UserPreferences.includeCompletionsWithInsertText
-         */
-        includeInsertTextCompletions?: boolean;
-    }
-    /**
-     * Completions request; value of command field is "completions".
-     * Given a file location (file, line, col) and a prefix (which may
-     * be the empty string), return the possible completions that
-     * begin with prefix.
-     */
-    interface CompletionsRequest extends FileLocationRequest {
-        command: CommandTypes.Completions;
-        arguments: CompletionsRequestArgs;
-    }
-    /**
-     * Arguments for completion details request.
-     */
-    interface CompletionDetailsRequestArgs extends FileLocationRequestArgs {
-        /**
-         * Names of one or more entries for which to obtain details.
-         */
-        entryNames: (string | CompletionEntryIdentifier)[];
-    }
-    interface CompletionEntryIdentifier {
-        name: string;
-        source?: string;
-    }
-    /**
-     * Completion entry details request; value of command field is
-     * "completionEntryDetails".  Given a file location (file, line,
-     * col) and an array of completion entry names return more
-     * detailed information for each completion entry.
-     */
-    interface CompletionDetailsRequest extends FileLocationRequest {
-        command: CommandTypes.CompletionDetails;
-        arguments: CompletionDetailsRequestArgs;
-    }
-    /**
-     * Part of a symbol description.
-     */
-    interface SymbolDisplayPart {
-        /**
-         * Text of an item describing the symbol.
-         */
-        text: string;
-        /**
-         * The symbol's kind (such as 'className' or 'parameterName' or plain 'text').
-         */
-        kind: string;
-    }
-    /**
-     * An item found in a completion response.
-     */
-    interface CompletionEntry {
-        /**
-         * The symbol's name.
-         */
-        name: string;
-        /**
-         * The symbol's kind (such as 'className' or 'parameterName').
-         */
-        kind: ScriptElementKind;
-        /**
-         * Optional modifiers for the kind (such as 'public').
-         */
-        kindModifiers?: string;
-        /**
-         * A string that is used for comparing completion items so that they can be ordered.  This
-         * is often the same as the name but may be different in certain circumstances.
-         */
-        sortText: string;
-        /**
-         * Text to insert instead of `name`.
-         * This is used to support bracketed completions; If `name` might be "a-b" but `insertText` would be `["a-b"]`,
-         * coupled with `replacementSpan` to replace a dotted access with a bracket access.
-         */
-        insertText?: string;
-        /**
-         * An optional span that indicates the text to be replaced by this completion item.
-         * If present, this span should be used instead of the default one.
-         * It will be set if the required span differs from the one generated by the default replacement behavior.
-         */
-        replacementSpan?: TextSpan;
-        /**
-         * Indicates whether commiting this completion entry will require additional code actions to be
-         * made to avoid errors. The CompletionEntryDetails will have these actions.
-         */
-        hasAction?: true;
-        /**
-         * Identifier (not necessarily human-readable) identifying where this completion came from.
-         */
-        source?: string;
-        /**
-         * If true, this completion should be highlighted as recommended. There will only be one of these.
-         * This will be set when we know the user should write an expression with a certain type and that type is an enum or constructable class.
-         * Then either that enum/class or a namespace containing it will be the recommended symbol.
-         */
-        isRecommended?: true;
-    }
-    /**
-     * Additional completion entry details, available on demand
-     */
-    interface CompletionEntryDetails {
-        /**
-         * The symbol's name.
-         */
-        name: string;
-        /**
-         * The symbol's kind (such as 'className' or 'parameterName').
-         */
-        kind: ScriptElementKind;
-        /**
-         * Optional modifiers for the kind (such as 'public').
-         */
-        kindModifiers: string;
-        /**
-         * Display parts of the symbol (similar to quick info).
-         */
-        displayParts: SymbolDisplayPart[];
-        /**
-         * Documentation strings for the symbol.
-         */
-        documentation?: SymbolDisplayPart[];
-        /**
-         * JSDoc tags for the symbol.
-         */
-        tags?: JSDocTagInfo[];
-        /**
-         * The associated code actions for this entry
-         */
-        codeActions?: CodeAction[];
-        /**
-         * Human-readable description of the `source` from the CompletionEntry.
-         */
-        source?: SymbolDisplayPart[];
-    }
-    interface CompletionsResponse extends Response {
-        body?: CompletionEntry[];
-    }
-    interface CompletionDetailsResponse extends Response {
-        body?: CompletionEntryDetails[];
-    }
-    /**
-     * Signature help information for a single parameter
-     */
-    interface SignatureHelpParameter {
-        /**
-         * The parameter's name
-         */
-        name: string;
-        /**
-         * Documentation of the parameter.
-         */
-        documentation: SymbolDisplayPart[];
-        /**
-         * Display parts of the parameter.
-         */
-        displayParts: SymbolDisplayPart[];
-        /**
-         * Whether the parameter is optional or not.
-         */
-        isOptional: boolean;
-    }
-    /**
-     * Represents a single signature to show in signature help.
-     */
-    interface SignatureHelpItem {
-        /**
-         * Whether the signature accepts a variable number of arguments.
-         */
-        isVariadic: boolean;
-        /**
-         * The prefix display parts.
-         */
-        prefixDisplayParts: SymbolDisplayPart[];
-        /**
-         * The suffix display parts.
-         */
-        suffixDisplayParts: SymbolDisplayPart[];
-        /**
-         * The separator display parts.
-         */
-        separatorDisplayParts: SymbolDisplayPart[];
-        /**
-         * The signature helps items for the parameters.
-         */
-        parameters: SignatureHelpParameter[];
-        /**
-         * The signature's documentation
-         */
-        documentation: SymbolDisplayPart[];
-        /**
-         * The signature's JSDoc tags
-         */
-        tags: JSDocTagInfo[];
-    }
-    /**
-     * Signature help items found in the response of a signature help request.
-     */
-    interface SignatureHelpItems {
-        /**
-         * The signature help items.
-         */
-        items: SignatureHelpItem[];
-        /**
-         * The span for which signature help should appear on a signature
-         */
-        applicableSpan: TextSpan;
-        /**
-         * The item selected in the set of available help items.
-         */
-        selectedItemIndex: number;
-        /**
-         * The argument selected in the set of parameters.
-         */
-        argumentIndex: number;
-        /**
-         * The argument count
-         */
-        argumentCount: number;
-    }
-    /**
-     * Arguments of a signature help request.
-     */
-    interface SignatureHelpRequestArgs extends FileLocationRequestArgs {
-    }
-    /**
-     * Signature help request; value of command field is "signatureHelp".
-     * Given a file location (file, line, col), return the signature
-     * help.
-     */
-    interface SignatureHelpRequest extends FileLocationRequest {
-        command: CommandTypes.SignatureHelp;
-        arguments: SignatureHelpRequestArgs;
-    }
-    /**
-     * Response object for a SignatureHelpRequest.
-     */
-    interface SignatureHelpResponse extends Response {
-        body?: SignatureHelpItems;
-    }
-    /**
-     * Synchronous request for semantic diagnostics of one file.
-     */
-    interface SemanticDiagnosticsSyncRequest extends FileRequest {
-        command: CommandTypes.SemanticDiagnosticsSync;
-        arguments: SemanticDiagnosticsSyncRequestArgs;
-    }
-    interface SemanticDiagnosticsSyncRequestArgs extends FileRequestArgs {
-        includeLinePosition?: boolean;
-    }
-    /**
-     * Response object for synchronous sematic diagnostics request.
-     */
-    interface SemanticDiagnosticsSyncResponse extends Response {
-        body?: Diagnostic[] | DiagnosticWithLinePosition[];
-    }
-    interface SuggestionDiagnosticsSyncRequest extends FileRequest {
-        command: CommandTypes.SuggestionDiagnosticsSync;
-        arguments: SuggestionDiagnosticsSyncRequestArgs;
-    }
-    type SuggestionDiagnosticsSyncRequestArgs = SemanticDiagnosticsSyncRequestArgs;
-    type SuggestionDiagnosticsSyncResponse = SemanticDiagnosticsSyncResponse;
-    /**
-     * Synchronous request for syntactic diagnostics of one file.
-     */
-    interface SyntacticDiagnosticsSyncRequest extends FileRequest {
-        command: CommandTypes.SyntacticDiagnosticsSync;
-        arguments: SyntacticDiagnosticsSyncRequestArgs;
-    }
-    interface SyntacticDiagnosticsSyncRequestArgs extends FileRequestArgs {
-        includeLinePosition?: boolean;
-    }
-    /**
-     * Response object for synchronous syntactic diagnostics request.
-     */
-    interface SyntacticDiagnosticsSyncResponse extends Response {
-        body?: Diagnostic[] | DiagnosticWithLinePosition[];
-    }
-    /**
-     * Arguments for GeterrForProject request.
-     */
-    interface GeterrForProjectRequestArgs {
-        /**
-         * the file requesting project error list
-         */
-        file: string;
-        /**
-         * Delay in milliseconds to wait before starting to compute
-         * errors for the files in the file list
-         */
-        delay: number;
-    }
-    /**
-     * GeterrForProjectRequest request; value of command field is
-     * "geterrForProject". It works similarly with 'Geterr', only
-     * it request for every file in this project.
-     */
-    interface GeterrForProjectRequest extends Request {
-        command: CommandTypes.GeterrForProject;
-        arguments: GeterrForProjectRequestArgs;
-    }
-    /**
-     * Arguments for geterr messages.
-     */
-    interface GeterrRequestArgs {
-        /**
-         * List of file names for which to compute compiler errors.
-         * The files will be checked in list order.
-         */
-        files: string[];
-        /**
-         * Delay in milliseconds to wait before starting to compute
-         * errors for the files in the file list
-         */
-        delay: number;
-    }
-    /**
-     * Geterr request; value of command field is "geterr". Wait for
-     * delay milliseconds and then, if during the wait no change or
-     * reload messages have arrived for the first file in the files
-     * list, get the syntactic errors for the file, field requests,
-     * and then get the semantic errors for the file.  Repeat with a
-     * smaller delay for each subsequent file on the files list.  Best
-     * practice for an editor is to send a file list containing each
-     * file that is currently visible, in most-recently-used order.
-     */
-    interface GeterrRequest extends Request {
-        command: CommandTypes.Geterr;
-        arguments: GeterrRequestArgs;
-    }
-    type RequestCompletedEventName = "requestCompleted";
-    /**
-     * Event that is sent when server have finished processing request with specified id.
-     */
-    interface RequestCompletedEvent extends Event {
-        event: RequestCompletedEventName;
-        body: RequestCompletedEventBody;
-    }
-    interface RequestCompletedEventBody {
-        request_seq: number;
-    }
-    /**
-     * Item of diagnostic information found in a DiagnosticEvent message.
-     */
-    interface Diagnostic {
-        /**
-         * Starting file location at which text applies.
-         */
-        start: Location;
-        /**
-         * The last file location at which the text applies.
-         */
-        end: Location;
-        /**
-         * Text of diagnostic message.
-         */
-        text: string;
-        /**
-         * The category of the diagnostic message, e.g. "error", "warning", or "suggestion".
-         */
-        category: string;
-        reportsUnnecessary?: {};
-        /**
-         * The error code of the diagnostic message.
-         */
-        code?: number;
-        /**
-         * The name of the plugin reporting the message.
-         */
-        source?: string;
-    }
-    interface DiagnosticWithFileName extends Diagnostic {
-        /**
-         * Name of the file the diagnostic is in
-         */
-        fileName: string;
-    }
-    interface DiagnosticEventBody {
-        /**
-         * The file for which diagnostic information is reported.
-         */
-        file: string;
-        /**
-         * An array of diagnostic information items.
-         */
-        diagnostics: Diagnostic[];
-    }
-    type DiagnosticEventKind = "semanticDiag" | "syntaxDiag" | "suggestionDiag";
-    /**
-     * Event message for DiagnosticEventKind event types.
-     * These events provide syntactic and semantic errors for a file.
-     */
-    interface DiagnosticEvent extends Event {
-        body?: DiagnosticEventBody;
-    }
-    interface ConfigFileDiagnosticEventBody {
-        /**
-         * The file which trigged the searching and error-checking of the config file
-         */
-        triggerFile: string;
-        /**
-         * The name of the found config file.
-         */
-        configFile: string;
-        /**
-         * An arry of diagnostic information items for the found config file.
-         */
-        diagnostics: DiagnosticWithFileName[];
-    }
-    /**
-     * Event message for "configFileDiag" event type.
-     * This event provides errors for a found config file.
-     */
-    interface ConfigFileDiagnosticEvent extends Event {
-        body?: ConfigFileDiagnosticEventBody;
-        event: "configFileDiag";
-    }
-    type ProjectLanguageServiceStateEventName = "projectLanguageServiceState";
-    interface ProjectLanguageServiceStateEvent extends Event {
-        event: ProjectLanguageServiceStateEventName;
-        body?: ProjectLanguageServiceStateEventBody;
-    }
-    interface ProjectLanguageServiceStateEventBody {
-        /**
-         * Project name that has changes in the state of language service.
-         * For configured projects this will be the config file path.
-         * For external projects this will be the name of the projects specified when project was open.
-         * For inferred projects this event is not raised.
-         */
-        projectName: string;
-        /**
-         * True if language service state switched from disabled to enabled
-         * and false otherwise.
-         */
-        languageServiceEnabled: boolean;
-    }
-    type ProjectsUpdatedInBackgroundEventName = "projectsUpdatedInBackground";
-    interface ProjectsUpdatedInBackgroundEvent extends Event {
-        event: ProjectsUpdatedInBackgroundEventName;
-        body: ProjectsUpdatedInBackgroundEventBody;
-    }
-    interface ProjectsUpdatedInBackgroundEventBody {
-        /**
-         * Current set of open files
-         */
-        openFiles: string[];
-    }
-    /**
-     * Arguments for reload request.
-     */
-    interface ReloadRequestArgs extends FileRequestArgs {
-        /**
-         * Name of temporary file from which to reload file
-         * contents. May be same as file.
-         */
-        tmpfile: string;
-    }
-    /**
-     * Reload request message; value of command field is "reload".
-     * Reload contents of file with name given by the 'file' argument
-     * from temporary file with name given by the 'tmpfile' argument.
-     * The two names can be identical.
-     */
-    interface ReloadRequest extends FileRequest {
-        command: CommandTypes.Reload;
-        arguments: ReloadRequestArgs;
-    }
-    /**
-     * Response to "reload" request. This is just an acknowledgement, so
-     * no body field is required.
-     */
-    interface ReloadResponse extends Response {
-    }
-    /**
-     * Arguments for saveto request.
-     */
-    interface SavetoRequestArgs extends FileRequestArgs {
-        /**
-         * Name of temporary file into which to save server's view of
-         * file contents.
-         */
-        tmpfile: string;
-    }
-    /**
-     * Saveto request message; value of command field is "saveto".
-     * For debugging purposes, save to a temporaryfile (named by
-     * argument 'tmpfile') the contents of file named by argument
-     * 'file'.  The server does not currently send a response to a
-     * "saveto" request.
-     */
-    interface SavetoRequest extends FileRequest {
-        command: CommandTypes.Saveto;
-        arguments: SavetoRequestArgs;
-    }
-    /**
-     * Arguments for navto request message.
-     */
-    interface NavtoRequestArgs extends FileRequestArgs {
-        /**
-         * Search term to navigate to from current location; term can
-         * be '.*' or an identifier prefix.
-         */
-        searchValue: string;
-        /**
-         *  Optional limit on the number of items to return.
-         */
-        maxResultCount?: number;
-        /**
-         * Optional flag to indicate we want results for just the current file
-         * or the entire project.
-         */
-        currentFileOnly?: boolean;
-        projectFileName?: string;
-    }
-    /**
-     * Navto request message; value of command field is "navto".
-     * Return list of objects giving file locations and symbols that
-     * match the search term given in argument 'searchTerm'.  The
-     * context for the search is given by the named file.
-     */
-    interface NavtoRequest extends FileRequest {
-        command: CommandTypes.Navto;
-        arguments: NavtoRequestArgs;
-    }
-    /**
-     * An item found in a navto response.
-     */
-    interface NavtoItem {
-        /**
-         * The symbol's name.
-         */
-        name: string;
-        /**
-         * The symbol's kind (such as 'className' or 'parameterName').
-         */
-        kind: ScriptElementKind;
-        /**
-         * exact, substring, or prefix.
-         */
-        matchKind?: string;
-        /**
-         * If this was a case sensitive or insensitive match.
-         */
-        isCaseSensitive?: boolean;
-        /**
-         * Optional modifiers for the kind (such as 'public').
-         */
-        kindModifiers?: string;
-        /**
-         * The file in which the symbol is found.
-         */
-        file: string;
-        /**
-         * The location within file at which the symbol is found.
-         */
-        start: Location;
-        /**
-         * One past the last character of the symbol.
-         */
-        end: Location;
-        /**
-         * Name of symbol's container symbol (if any); for example,
-         * the class name if symbol is a class member.
-         */
-        containerName?: string;
-        /**
-         * Kind of symbol's container symbol (if any).
-         */
-        containerKind?: ScriptElementKind;
-    }
-    /**
-     * Navto response message. Body is an array of navto items.  Each
-     * item gives a symbol that matched the search term.
-     */
-    interface NavtoResponse extends Response {
-        body?: NavtoItem[];
-    }
-    /**
-     * Arguments for change request message.
-     */
-    interface ChangeRequestArgs extends FormatRequestArgs {
-        /**
-         * Optional string to insert at location (file, line, offset).
-         */
-        insertString?: string;
-    }
-    /**
-     * Change request message; value of command field is "change".
-     * Update the server's view of the file named by argument 'file'.
-     * Server does not currently send a response to a change request.
-     */
-    interface ChangeRequest extends FileLocationRequest {
-        command: CommandTypes.Change;
-        arguments: ChangeRequestArgs;
-    }
-    /**
-     * Response to "brace" request.
-     */
-    interface BraceResponse extends Response {
-        body?: TextSpan[];
-    }
-    /**
-     * Brace matching request; value of command field is "brace".
-     * Return response giving the file locations of matching braces
-     * found in file at location line, offset.
-     */
-    interface BraceRequest extends FileLocationRequest {
-        command: CommandTypes.Brace;
-    }
-    /**
-     * NavBar items request; value of command field is "navbar".
-     * Return response giving the list of navigation bar entries
-     * extracted from the requested file.
-     */
-    interface NavBarRequest extends FileRequest {
-        command: CommandTypes.NavBar;
-    }
-    /**
-     * NavTree request; value of command field is "navtree".
-     * Return response giving the navigation tree of the requested file.
-     */
-    interface NavTreeRequest extends FileRequest {
-        command: CommandTypes.NavTree;
-    }
-    interface NavigationBarItem {
-        /**
-         * The item's display text.
-         */
-        text: string;
-        /**
-         * The symbol's kind (such as 'className' or 'parameterName').
-         */
-        kind: ScriptElementKind;
-        /**
-         * Optional modifiers for the kind (such as 'public').
-         */
-        kindModifiers?: string;
-        /**
-         * The definition locations of the item.
-         */
-        spans: TextSpan[];
-        /**
-         * Optional children.
-         */
-        childItems?: NavigationBarItem[];
-        /**
-         * Number of levels deep this item should appear.
-         */
-        indent: number;
-    }
-    /** protocol.NavigationTree is identical to ts.NavigationTree, except using protocol.TextSpan instead of ts.TextSpan */
-    interface NavigationTree {
-        text: string;
-        kind: ScriptElementKind;
-        kindModifiers: string;
-        spans: TextSpan[];
-        nameSpan: TextSpan | undefined;
-        childItems?: NavigationTree[];
-    }
-    type TelemetryEventName = "telemetry";
-    interface TelemetryEvent extends Event {
-        event: TelemetryEventName;
-        body: TelemetryEventBody;
-    }
-    interface TelemetryEventBody {
-        telemetryEventName: string;
-        payload: any;
-    }
-    type TypesInstallerInitializationFailedEventName = "typesInstallerInitializationFailed";
-    interface TypesInstallerInitializationFailedEvent extends Event {
-        event: TypesInstallerInitializationFailedEventName;
-        body: TypesInstallerInitializationFailedEventBody;
-    }
-    interface TypesInstallerInitializationFailedEventBody {
-        message: string;
-    }
-    type TypingsInstalledTelemetryEventName = "typingsInstalled";
-    interface TypingsInstalledTelemetryEventBody extends TelemetryEventBody {
-        telemetryEventName: TypingsInstalledTelemetryEventName;
-        payload: TypingsInstalledTelemetryEventPayload;
-    }
-    interface TypingsInstalledTelemetryEventPayload {
-        /**
-         * Comma separated list of installed typing packages
-         */
-        installedPackages: string;
-        /**
-         * true if install request succeeded, otherwise - false
-         */
-        installSuccess: boolean;
-        /**
-         * version of typings installer
-         */
-        typingsInstallerVersion: string;
-    }
-    type BeginInstallTypesEventName = "beginInstallTypes";
-    type EndInstallTypesEventName = "endInstallTypes";
-    interface BeginInstallTypesEvent extends Event {
-        event: BeginInstallTypesEventName;
-        body: BeginInstallTypesEventBody;
-    }
-    interface EndInstallTypesEvent extends Event {
-        event: EndInstallTypesEventName;
-        body: EndInstallTypesEventBody;
-    }
-    interface InstallTypesEventBody {
-        /**
-         * correlation id to match begin and end events
-         */
-        eventId: number;
-        /**
-         * list of packages to install
-         */
-        packages: ReadonlyArray<string>;
-    }
-    interface BeginInstallTypesEventBody extends InstallTypesEventBody {
-    }
-    interface EndInstallTypesEventBody extends InstallTypesEventBody {
-        /**
-         * true if installation succeeded, otherwise false
-         */
-        success: boolean;
-    }
-    interface NavBarResponse extends Response {
-        body?: NavigationBarItem[];
-    }
-    interface NavTreeResponse extends Response {
-        body?: NavigationTree;
-    }
-    enum IndentStyle {
-        None = "None",
-        Block = "Block",
-        Smart = "Smart"
-    }
-    interface EditorSettings {
-        baseIndentSize?: number;
-        indentSize?: number;
-        tabSize?: number;
-        newLineCharacter?: string;
-        convertTabsToSpaces?: boolean;
-        indentStyle?: IndentStyle | ts.IndentStyle;
-    }
-    interface FormatCodeSettings extends EditorSettings {
-        insertSpaceAfterCommaDelimiter?: boolean;
-        insertSpaceAfterSemicolonInForStatements?: boolean;
-        insertSpaceBeforeAndAfterBinaryOperators?: boolean;
-        insertSpaceAfterConstructor?: boolean;
-        insertSpaceAfterKeywordsInControlFlowStatements?: boolean;
-        insertSpaceAfterFunctionKeywordForAnonymousFunctions?: boolean;
-        insertSpaceAfterOpeningAndBeforeClosingNonemptyParenthesis?: boolean;
-        insertSpaceAfterOpeningAndBeforeClosingNonemptyBrackets?: boolean;
-        insertSpaceAfterOpeningAndBeforeClosingNonemptyBraces?: boolean;
-        insertSpaceAfterOpeningAndBeforeClosingTemplateStringBraces?: boolean;
-        insertSpaceAfterOpeningAndBeforeClosingJsxExpressionBraces?: boolean;
-        insertSpaceAfterTypeAssertion?: boolean;
-        insertSpaceBeforeFunctionParenthesis?: boolean;
-        placeOpenBraceOnNewLineForFunctions?: boolean;
-        placeOpenBraceOnNewLineForControlBlocks?: boolean;
-        insertSpaceBeforeTypeAnnotation?: boolean;
-    }
-    interface UserPreferences {
-        readonly disableSuggestions?: boolean;
-        readonly quotePreference?: "double" | "single";
-        /**
-         * If enabled, TypeScript will search through all external modules' exports and add them to the completions list.
-         * This affects lone identifier completions but not completions on the right hand side of `obj.`.
-         */
-        readonly includeCompletionsForModuleExports?: boolean;
-        /**
-         * If enabled, the completion list will include completions with invalid identifier names.
-         * For those entries, The `insertText` and `replacementSpan` properties will be set to change from `.x` property access to `["x"]`.
-         */
-        readonly includeCompletionsWithInsertText?: boolean;
-        readonly importModuleSpecifierPreference?: "relative" | "non-relative";
-        readonly allowTextChangesInNewFiles?: boolean;
-    }
-    interface CompilerOptions {
-        allowJs?: boolean;
-        allowSyntheticDefaultImports?: boolean;
-        allowUnreachableCode?: boolean;
-        allowUnusedLabels?: boolean;
-        alwaysStrict?: boolean;
-        baseUrl?: string;
-        charset?: string;
-        checkJs?: boolean;
-        declaration?: boolean;
-        declarationDir?: string;
-        disableSizeLimit?: boolean;
-        downlevelIteration?: boolean;
-        emitBOM?: boolean;
-        emitDecoratorMetadata?: boolean;
-        experimentalDecorators?: boolean;
-        forceConsistentCasingInFileNames?: boolean;
-        importHelpers?: boolean;
-        inlineSourceMap?: boolean;
-        inlineSources?: boolean;
-        isolatedModules?: boolean;
-        jsx?: JsxEmit | ts.JsxEmit;
-        lib?: string[];
-        locale?: string;
-        mapRoot?: string;
-        maxNodeModuleJsDepth?: number;
-        module?: ModuleKind | ts.ModuleKind;
-        moduleResolution?: ModuleResolutionKind | ts.ModuleResolutionKind;
-        newLine?: NewLineKind | ts.NewLineKind;
-        noEmit?: boolean;
-        noEmitHelpers?: boolean;
-        noEmitOnError?: boolean;
-        noErrorTruncation?: boolean;
-        noFallthroughCasesInSwitch?: boolean;
-        noImplicitAny?: boolean;
-        noImplicitReturns?: boolean;
-        noImplicitThis?: boolean;
-        noUnusedLocals?: boolean;
-        noUnusedParameters?: boolean;
-        noImplicitUseStrict?: boolean;
-        noLib?: boolean;
-        noResolve?: boolean;
-        out?: string;
-        outDir?: string;
-        outFile?: string;
-        paths?: MapLike<string[]>;
-        plugins?: PluginImport[];
-        preserveConstEnums?: boolean;
-        preserveSymlinks?: boolean;
-        project?: string;
-        reactNamespace?: string;
-        removeComments?: boolean;
-        references?: ProjectReference[];
-        rootDir?: string;
-        rootDirs?: string[];
-        skipLibCheck?: boolean;
-        skipDefaultLibCheck?: boolean;
-        sourceMap?: boolean;
-        sourceRoot?: string;
-        strict?: boolean;
-        strictNullChecks?: boolean;
-        suppressExcessPropertyErrors?: boolean;
-        suppressImplicitAnyIndexErrors?: boolean;
-        target?: ScriptTarget | ts.ScriptTarget;
-        traceResolution?: boolean;
-        resolveJsonModule?: boolean;
-        types?: string[];
-        /** Paths used to used to compute primary types search locations */
-        typeRoots?: string[];
-        [option: string]: CompilerOptionsValue | undefined;
-    }
-    enum JsxEmit {
-        None = "None",
-        Preserve = "Preserve",
-        ReactNative = "ReactNative",
-        React = "React"
-    }
-    enum ModuleKind {
-        None = "None",
-        CommonJS = "CommonJS",
-        AMD = "AMD",
-        UMD = "UMD",
-        System = "System",
-        ES6 = "ES6",
-        ES2015 = "ES2015",
-        ESNext = "ESNext"
-    }
-    enum ModuleResolutionKind {
-        Classic = "Classic",
-        Node = "Node"
-    }
-    enum NewLineKind {
-        Crlf = "Crlf",
-        Lf = "Lf"
-    }
-    enum ScriptTarget {
-        ES3 = "ES3",
-        ES5 = "ES5",
-        ES6 = "ES6",
-        ES2015 = "ES2015",
-        ES2016 = "ES2016",
-        ES2017 = "ES2017",
-        ESNext = "ESNext"
-    }
-}
-declare namespace ts.server {
-    class ScriptInfo {
-        private readonly host;
-        readonly fileName: NormalizedPath;
-        readonly scriptKind: ScriptKind;
-        readonly hasMixedContent: boolean;
-        readonly path: Path;
-        /**
-         * All projects that include this file
-         */
-        readonly containingProjects: Project[];
-        private formatSettings;
-        private preferences;
-        private textStorage;
-        constructor(host: ServerHost, fileName: NormalizedPath, scriptKind: ScriptKind, hasMixedContent: boolean, path: Path);
-        isScriptOpen(): boolean;
-        open(newText: string): void;
-        close(fileExists?: boolean): void;
-        getSnapshot(): IScriptSnapshot;
-        private ensureRealPath;
-        getFormatCodeSettings(): FormatCodeSettings | undefined;
-        getPreferences(): UserPreferences | undefined;
-        attachToProject(project: Project): boolean;
-        isAttached(project: Project): boolean;
-        detachFromProject(project: Project): void;
-        detachAllProjects(): void;
-        getDefaultProject(): Project;
-        registerFileUpdate(): void;
-        setOptions(formatSettings: FormatCodeSettings, preferences: UserPreferences | undefined): void;
-        getLatestVersion(): string;
-        saveTo(fileName: string): void;
-        reloadFromFile(tempFileName?: NormalizedPath): void;
-        editContent(start: number, end: number, newText: string): void;
-        markContainingProjectsAsDirty(): void;
-        isOrphan(): boolean;
-        /**
-         *  @param line 1 based index
-         */
-        lineToTextSpan(line: number): TextSpan;
-        /**
-         * @param line 1 based index
-         * @param offset 1 based index
-         */
-        lineOffsetToPosition(line: number, offset: number): number;
-        positionToLineOffset(position: number): protocol.Location;
-        isJavaScript(): boolean;
-    }
-}
-declare namespace ts.server {
-    interface InstallPackageOptionsWithProject extends InstallPackageOptions {
-        projectName: string;
-        projectRootPath: Path;
-    }
-    interface ITypingsInstaller {
-        isKnownTypesPackageName(name: string): boolean;
-        installPackage(options: InstallPackageOptionsWithProject): Promise<ApplyCodeActionCommandResult>;
-        enqueueInstallTypingsRequest(p: Project, typeAcquisition: TypeAcquisition, unresolvedImports: SortedReadonlyArray<string> | undefined): void;
-        attach(projectService: ProjectService): void;
-        onProjectClosed(p: Project): void;
-        readonly globalTypingsCacheLocation: string | undefined;
-    }
-    const nullTypingsInstaller: ITypingsInstaller;
-}
-declare namespace ts.server {
-    enum ProjectKind {
-        Inferred = 0,
-        Configured = 1,
-        External = 2
-    }
-    function allRootFilesAreJsOrDts(project: Project): boolean;
-    function allFilesAreJsOrDts(project: Project): boolean;
-    interface PluginCreateInfo {
-        project: Project;
-        languageService: LanguageService;
-        languageServiceHost: LanguageServiceHost;
-        serverHost: ServerHost;
-        config: any;
-    }
-    interface PluginModule {
-        create(createInfo: PluginCreateInfo): LanguageService;
-        getExternalFiles?(proj: Project): string[];
-    }
-    type PluginModuleFactory = (mod: {
-        typescript: typeof ts;
-    }) => PluginModule;
-    /**
-     * The project root can be script info - if root is present,
-     * or it could be just normalized path if root wasnt present on the host(only for non inferred project)
-     */
-    type ProjectRoot = ScriptInfo | NormalizedPath;
-    abstract class Project implements LanguageServiceHost, ModuleResolutionHost {
-        readonly projectName: string;
-        readonly projectKind: ProjectKind;
-        readonly projectService: ProjectService;
-        private documentRegistry;
-        private compilerOptions;
-        compileOnSaveEnabled: boolean;
-        private rootFiles;
-        private rootFilesMap;
-        private program;
-        private externalFiles;
-        private missingFilesMap;
-        private plugins;
-        private lastFileExceededProgramSize;
-        protected languageService: LanguageService;
-        languageServiceEnabled: boolean;
-        readonly trace?: (s: string) => void;
-        readonly realpath?: (path: string) => string;
-        private builderState;
-        /**
-         * Set of files names that were updated since the last call to getChangesSinceVersion.
-         */
-        private updatedFileNames;
-        /**
-         * Set of files that was returned from the last call to getChangesSinceVersion.
-         */
-        private lastReportedFileNames;
-        /**
-         * Last version that was reported.
-         */
-        private lastReportedVersion;
-        /**
-         * Current project's program version. (incremented everytime new program is created that is not complete reuse from the old one)
-         * This property is changed in 'updateGraph' based on the set of files in program
-         */
-        private projectProgramVersion;
-        /**
-         * Current version of the project state. It is changed when:
-         * - new root file was added/removed
-         * - edit happen in some file that is currently included in the project.
-         * This property is different from projectStructureVersion since in most cases edits don't affect set of files in the project
-         */
-        private projectStateVersion;
-        private readonly cancellationToken;
-        isNonTsProject(): boolean;
-        isJsOnlyProject(): boolean;
-        static resolveModule(moduleName: string, initialDir: string, host: ServerHost, log: (message: string) => void): {} | undefined;
-        isKnownTypesPackageName(name: string): boolean;
-        installPackage(options: InstallPackageOptions): Promise<ApplyCodeActionCommandResult>;
-        private readonly typingsCache;
-        getCompilationSettings(): CompilerOptions;
-        getCompilerOptions(): CompilerOptions;
-        getNewLine(): string;
-        getProjectVersion(): string;
-        getProjectReferences(): ReadonlyArray<ProjectReference> | undefined;
-        getScriptFileNames(): string[];
-        private getOrCreateScriptInfoAndAttachToProject;
-        getScriptKind(fileName: string): ScriptKind;
-        getScriptVersion(filename: string): string;
-        getScriptSnapshot(filename: string): IScriptSnapshot | undefined;
-        getCancellationToken(): HostCancellationToken;
-        getCurrentDirectory(): string;
-        getDefaultLibFileName(): string;
-        useCaseSensitiveFileNames(): boolean;
-        readDirectory(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
-        readFile(fileName: string): string | undefined;
-        fileExists(file: string): boolean;
-        resolveModuleNames(moduleNames: string[], containingFile: string, reusedNames?: string[]): ResolvedModuleFull[];
-        getResolvedModuleWithFailedLookupLocationsFromCache(moduleName: string, containingFile: string): ResolvedModuleWithFailedLookupLocations | undefined;
-        resolveTypeReferenceDirectives(typeDirectiveNames: string[], containingFile: string): ResolvedTypeReferenceDirective[];
-        directoryExists(path: string): boolean;
-        getDirectories(path: string): string[];
-        log(s: string): void;
-        error(s: string): void;
-        private setInternalCompilerOptionsForEmittingJsFiles;
-        /**
-         * Get the errors that dont have any file name associated
-         */
-        getGlobalProjectErrors(): ReadonlyArray<Diagnostic>;
-        getAllProjectErrors(): ReadonlyArray<Diagnostic>;
-        getLanguageService(ensureSynchronized?: boolean): LanguageService;
-        private shouldEmitFile;
-        getCompileOnSaveAffectedFileList(scriptInfo: ScriptInfo): string[];
-        /**
-         * Returns true if emit was conducted
-         */
-        emitFile(scriptInfo: ScriptInfo, writeFile: (path: string, data: string, writeByteOrderMark?: boolean) => void): boolean;
-        enableLanguageService(): void;
-        disableLanguageService(lastFileExceededProgramSize?: string): void;
-        getProjectName(): string;
-        abstract getTypeAcquisition(): TypeAcquisition;
-        protected removeLocalTypingsFromTypeAcquisition(newTypeAcquisition: TypeAcquisition): TypeAcquisition;
-        getExternalFiles(): SortedReadonlyArray<string>;
-        getSourceFile(path: Path): SourceFile | undefined;
-        close(): void;
-        private detachScriptInfoIfNotRoot;
-        isClosed(): boolean;
-        hasRoots(): boolean;
-        getRootFiles(): NormalizedPath[];
-        getRootScriptInfos(): ScriptInfo[];
-        getScriptInfos(): ScriptInfo[];
-        getExcludedFiles(): ReadonlyArray<NormalizedPath>;
-        getFileNames(excludeFilesFromExternalLibraries?: boolean, excludeConfigFiles?: boolean): NormalizedPath[];
-        hasConfigFile(configFilePath: NormalizedPath): boolean;
-        containsScriptInfo(info: ScriptInfo): boolean;
-        containsFile(filename: NormalizedPath, requireOpen?: boolean): boolean;
-        isRoot(info: ScriptInfo): boolean;
-        addRoot(info: ScriptInfo): void;
-        addMissingFileRoot(fileName: NormalizedPath): void;
-        removeFile(info: ScriptInfo, fileExists: boolean, detachFromProject: boolean): void;
-        registerFileUpdate(fileName: string): void;
-        markAsDirty(): void;
-        /**
-         * Updates set of files that contribute to this project
-         * @returns: true if set of files in the project stays the same and false - otherwise.
-         */
-        updateGraph(): boolean;
-        protected removeExistingTypings(include: string[]): string[];
-        private updateGraphWorker;
-        private detachScriptInfoFromProject;
-        private addMissingFileWatcher;
-        private isWatchedMissingFile;
-        getScriptInfoForNormalizedPath(fileName: NormalizedPath): ScriptInfo | undefined;
-        getScriptInfo(uncheckedFileName: string): ScriptInfo | undefined;
-        filesToString(writeProjectFileNames: boolean): string;
-        setCompilerOptions(compilerOptions: CompilerOptions): void;
-        protected removeRoot(info: ScriptInfo): void;
-        protected enableGlobalPlugins(): void;
-        protected enablePlugin(pluginConfigEntry: PluginImport, searchPaths: string[]): void;
-        /** Starts a new check for diagnostics. Call this if some file has updated that would cause diagnostics to be changed. */
-        refreshDiagnostics(): void;
-        private enableProxy;
-    }
-    /**
-     * If a file is opened and no tsconfig (or jsconfig) is found,
-     * the file and its imports/references are put into an InferredProject.
-     */
-    class InferredProject extends Project {
-        private static readonly newName;
-        private _isJsInferredProject;
-        toggleJsInferredProject(isJsInferredProject: boolean): void;
-        setCompilerOptions(options?: CompilerOptions): void;
-        /** this is canonical project root path */
-        readonly projectRootPath: string | undefined;
-        addRoot(info: ScriptInfo): void;
-        removeRoot(info: ScriptInfo): void;
-        isProjectWithSingleRoot(): boolean;
-        close(): void;
-        getTypeAcquisition(): TypeAcquisition;
-    }
-    /**
-     * If a file is opened, the server will look for a tsconfig (or jsconfig)
-     * and if successfull create a ConfiguredProject for it.
-     * Otherwise it will create an InferredProject.
-     */
-    class ConfiguredProject extends Project {
-        compileOnSaveEnabled: boolean;
-        private projectReferences;
-        private typeAcquisition;
-        private directoriesWatchedForWildcards;
-        readonly canonicalConfigFilePath: NormalizedPath;
-        /** Ref count to the project when opened from external project */
-        private externalProjectRefCount;
-        private projectErrors;
-        /**
-         * If the project has reload from disk pending, it reloads (and then updates graph as part of that) instead of just updating the graph
-         * @returns: true if set of files in the project stays the same and false - otherwise.
-         */
-        updateGraph(): boolean;
-        getConfigFilePath(): NormalizedPath;
-        getProjectReferences(): ReadonlyArray<ProjectReference> | undefined;
-        updateReferences(refs: ReadonlyArray<ProjectReference> | undefined): void;
-        enablePlugins(): void;
-        /**
-         * Get the errors that dont have any file name associated
-         */
-        getGlobalProjectErrors(): ReadonlyArray<Diagnostic>;
-        /**
-         * Get all the project errors
-         */
-        getAllProjectErrors(): ReadonlyArray<Diagnostic>;
-        setProjectErrors(projectErrors: Diagnostic[]): void;
-        setTypeAcquisition(newTypeAcquisition: TypeAcquisition): void;
-        getTypeAcquisition(): TypeAcquisition;
-        close(): void;
-        getEffectiveTypeRoots(): string[];
-    }
-    /**
-     * Project whose configuration is handled externally, such as in a '.csproj'.
-     * These are created only if a host explicitly calls `openExternalProject`.
-     */
-    class ExternalProject extends Project {
-        externalProjectName: string;
-        compileOnSaveEnabled: boolean;
-        excludedFiles: ReadonlyArray<NormalizedPath>;
-        private typeAcquisition;
-        getExcludedFiles(): ReadonlyArray<NormalizedPath>;
-        getTypeAcquisition(): TypeAcquisition;
-        setTypeAcquisition(newTypeAcquisition: TypeAcquisition): void;
-    }
-}
-declare namespace ts.server {
-    const maxProgramSizeForNonTsFiles: number;
-    const ProjectsUpdatedInBackgroundEvent = "projectsUpdatedInBackground";
-    const ConfigFileDiagEvent = "configFileDiag";
-    const ProjectLanguageServiceStateEvent = "projectLanguageServiceState";
-    const ProjectInfoTelemetryEvent = "projectInfo";
-    const OpenFileInfoTelemetryEvent = "openFileInfo";
-    interface ProjectsUpdatedInBackgroundEvent {
-        eventName: typeof ProjectsUpdatedInBackgroundEvent;
-        data: {
-            openFiles: string[];
-        };
-    }
-    interface ConfigFileDiagEvent {
-        eventName: typeof ConfigFileDiagEvent;
-        data: {
-            triggerFile: string;
-            configFileName: string;
-            diagnostics: ReadonlyArray<Diagnostic>;
-        };
-    }
-    interface ProjectLanguageServiceStateEvent {
-        eventName: typeof ProjectLanguageServiceStateEvent;
-        data: {
-            project: Project;
-            languageServiceEnabled: boolean;
-        };
-    }
-    /** This will be converted to the payload of a protocol.TelemetryEvent in session.defaultEventHandler. */
-    interface ProjectInfoTelemetryEvent {
-        readonly eventName: typeof ProjectInfoTelemetryEvent;
-        readonly data: ProjectInfoTelemetryEventData;
-    }
-    interface ProjectInfoTelemetryEventData {
-        /** Cryptographically secure hash of project file location. */
-        readonly projectId: string;
-        /** Count of file extensions seen in the project. */
-        readonly fileStats: FileStats;
-        /**
-         * Any compiler options that might contain paths will be taken out.
-         * Enum compiler options will be converted to strings.
-         */
-        readonly compilerOptions: CompilerOptions;
-        readonly extends: boolean | undefined;
-        readonly files: boolean | undefined;
-        readonly include: boolean | undefined;
-        readonly exclude: boolean | undefined;
-        readonly compileOnSave: boolean;
-        readonly typeAcquisition: ProjectInfoTypeAcquisitionData;
-        readonly configFileName: "tsconfig.json" | "jsconfig.json" | "other";
-        readonly projectType: "external" | "configured";
-        readonly languageServiceEnabled: boolean;
-        /** TypeScript version used by the server. */
-        readonly version: string;
-    }
-    /**
-     * Info that we may send about a file that was just opened.
-     * Info about a file will only be sent once per session, even if the file changes in ways that might affect the info.
-     * Currently this is only sent for '.js' files.
-     */
-    interface OpenFileInfoTelemetryEvent {
-        readonly eventName: typeof OpenFileInfoTelemetryEvent;
-        readonly data: OpenFileInfoTelemetryEventData;
-    }
-    interface OpenFileInfoTelemetryEventData {
-        readonly info: OpenFileInfo;
-    }
-    interface ProjectInfoTypeAcquisitionData {
-        readonly enable: boolean | undefined;
-        readonly include: boolean;
-        readonly exclude: boolean;
-    }
-    interface FileStats {
-        readonly js: number;
-        readonly jsx: number;
-        readonly ts: number;
-        readonly tsx: number;
-        readonly dts: number;
-        readonly deferred: number;
-    }
-    interface OpenFileInfo {
-        readonly checkJs: boolean;
-    }
-    type ProjectServiceEvent = ProjectsUpdatedInBackgroundEvent | ConfigFileDiagEvent | ProjectLanguageServiceStateEvent | ProjectInfoTelemetryEvent | OpenFileInfoTelemetryEvent;
-    type ProjectServiceEventHandler = (event: ProjectServiceEvent) => void;
-    interface SafeList {
-        [name: string]: {
-            match: RegExp;
-            exclude?: (string | number)[][];
-            types?: string[];
-        };
-    }
-    interface TypesMapFile {
-        typesMap: SafeList;
-        simpleMap: {
-            [libName: string]: string;
-        };
-    }
-    function convertFormatOptions(protocolOptions: protocol.FormatCodeSettings): FormatCodeSettings;
-    function convertCompilerOptions(protocolOptions: protocol.ExternalProjectCompilerOptions): CompilerOptions & protocol.CompileOnSaveMixin;
-    function tryConvertScriptKindName(scriptKindName: protocol.ScriptKindName | ScriptKind): ScriptKind;
-    function convertScriptKindName(scriptKindName: protocol.ScriptKindName): ScriptKind.Unknown | ScriptKind.JS | ScriptKind.JSX | ScriptKind.TS | ScriptKind.TSX;
-    interface HostConfiguration {
-        formatCodeOptions: FormatCodeSettings;
-        preferences: UserPreferences;
-        hostInfo: string;
-        extraFileExtensions?: FileExtensionInfo[];
-    }
-    interface OpenConfiguredProjectResult {
-        configFileName?: NormalizedPath;
-        configFileErrors?: ReadonlyArray<Diagnostic>;
-    }
-    interface ProjectServiceOptions {
-        host: ServerHost;
-        logger: Logger;
-        cancellationToken: HostCancellationToken;
-        useSingleInferredProject: boolean;
-        useInferredProjectPerProjectRoot: boolean;
-        typingsInstaller: ITypingsInstaller;
-        eventHandler?: ProjectServiceEventHandler;
-        suppressDiagnosticEvents?: boolean;
-        throttleWaitMilliseconds?: number;
-        globalPlugins?: ReadonlyArray<string>;
-        pluginProbeLocations?: ReadonlyArray<string>;
-        allowLocalPluginLoads?: boolean;
-        typesMapLocation?: string;
-        syntaxOnly?: boolean;
-    }
-    class ProjectService {
-        /**
-         * Container of all known scripts
-         */
-        private readonly filenameToScriptInfo;
-        private readonly allJsFilesForOpenFileTelemetry;
-        /**
-         * maps external project file name to list of config files that were the part of this project
-         */
-        private readonly externalProjectToConfiguredProjectMap;
-        /**
-         * external projects (configuration and list of root files is not controlled by tsserver)
-         */
-        readonly externalProjects: ExternalProject[];
-        /**
-         * projects built from openFileRoots
-         */
-        readonly inferredProjects: InferredProject[];
-        /**
-         * projects specified by a tsconfig.json file
-         */
-        readonly configuredProjects: Map<ConfiguredProject>;
-        /**
-         * Open files: with value being project root path, and key being Path of the file that is open
-         */
-        readonly openFiles: Map<NormalizedPath | undefined>;
-        /**
-         * Map of open files that are opened without complete path but have projectRoot as current directory
-         */
-        private readonly openFilesWithNonRootedDiskPath;
-        private compilerOptionsForInferredProjects;
-        private compilerOptionsForInferredProjectsPerProjectRoot;
-        /**
-         * Project size for configured or external projects
-         */
-        private readonly projectToSizeMap;
-        /**
-         * This is a map of config file paths existance that doesnt need query to disk
-         * - The entry can be present because there is inferred project that needs to watch addition of config file to directory
-         *   In this case the exists could be true/false based on config file is present or not
-         * - Or it is present if we have configured project open with config file at that location
-         *   In this case the exists property is always true
-         */
-        private readonly configFileExistenceInfoCache;
-        private readonly throttledOperations;
-        private readonly hostConfiguration;
-        private safelist;
-        private legacySafelist;
-        private pendingProjectUpdates;
-        readonly currentDirectory: NormalizedPath;
-        readonly toCanonicalFileName: (f: string) => string;
-        readonly host: ServerHost;
-        readonly logger: Logger;
-        readonly cancellationToken: HostCancellationToken;
-        readonly useSingleInferredProject: boolean;
-        readonly useInferredProjectPerProjectRoot: boolean;
-        readonly typingsInstaller: ITypingsInstaller;
-        private readonly globalCacheLocationDirectoryPath;
-        readonly throttleWaitMilliseconds?: number;
-        private readonly eventHandler?;
-        private readonly suppressDiagnosticEvents?;
-        readonly globalPlugins: ReadonlyArray<string>;
-        readonly pluginProbeLocations: ReadonlyArray<string>;
-        readonly allowLocalPluginLoads: boolean;
-        readonly typesMapLocation: string | undefined;
-        readonly syntaxOnly?: boolean;
-        /** Tracks projects that we have already sent telemetry for. */
-        private readonly seenProjects;
-        constructor(opts: ProjectServiceOptions);
-        toPath(fileName: string): Path;
-        private loadTypesMap;
-        updateTypingsForProject(response: SetTypings | InvalidateCachedTypings | PackageInstalledResponse): void;
-        private delayEnsureProjectForOpenFiles;
-        private delayUpdateProjectGraph;
-        private delayUpdateProjectGraphs;
-        setCompilerOptionsForInferredProjects(projectCompilerOptions: protocol.ExternalProjectCompilerOptions, projectRootPath?: string): void;
-        findProject(projectName: string): Project | undefined;
-        getDefaultProjectForFile(fileName: NormalizedPath, ensureProject: boolean): Project | undefined;
-        getScriptInfoEnsuringProjectsUptoDate(uncheckedFileName: string): ScriptInfo | undefined;
-        /**
-         * Ensures the project structures are upto date
-         * This means,
-         * - we go through all the projects and update them if they are dirty
-         * - if updates reflect some change in structure or there was pending request to ensure projects for open files
-         *   ensure that each open script info has project
-         */
-        private ensureProjectStructuresUptoDate;
-        getFormatCodeOptions(file: NormalizedPath): FormatCodeSettings;
-        getPreferences(file: NormalizedPath): UserPreferences;
-        private onSourceFileChanged;
-        private handleDeletedFile;
-        private onConfigChangedForConfiguredProject;
-        /**
-         * This is the callback function for the config file add/remove/change at any location
-         * that matters to open script info but doesnt have configured project open
-         * for the config file
-         */
-        private onConfigFileChangeForOpenScriptInfo;
-        private removeProject;
-        /**
-         * Remove this file from the set of open, non-configured files.
-         * @param info The file that has been closed or newly configured
-         */
-        private closeOpenFile;
-        private deleteScriptInfo;
-        private configFileExists;
-        private setConfigFileExistenceByNewConfiguredProject;
-        /**
-         * Returns true if the configFileExistenceInfo is needed/impacted by open files that are root of inferred project
-         */
-        private configFileExistenceImpactsRootOfInferredProject;
-        private setConfigFileExistenceInfoByClosedConfiguredProject;
-        private logConfigFileWatchUpdate;
-        /**
-         * Create the watcher for the configFileExistenceInfo
-         */
-        private createConfigFileWatcherOfConfigFileExistence;
-        /**
-         * Close the config file watcher in the cached ConfigFileExistenceInfo
-         *   if there arent any open files that are root of inferred project
-         */
-        private closeConfigFileWatcherOfConfigFileExistenceInfo;
-        /**
-         * This is called on file close, so that we stop watching the config file for this script info
-         */
-        private stopWatchingConfigFilesForClosedScriptInfo;
-        /**
-         * This function tries to search for a tsconfig.json for the given file.
-         * This is different from the method the compiler uses because
-         * the compiler can assume it will always start searching in the
-         * current directory (the directory in which tsc was invoked).
-         * The server must start searching from the directory containing
-         * the newly opened file.
-         */
-        private forEachConfigFileLocation;
-        /**
-         * This function tries to search for a tsconfig.json for the given file.
-         * This is different from the method the compiler uses because
-         * the compiler can assume it will always start searching in the
-         * current directory (the directory in which tsc was invoked).
-         * The server must start searching from the directory containing
-         * the newly opened file.
-         */
-        private getConfigFileNameForFile;
-        private printProjects;
-        private findConfiguredProjectByProjectName;
-        private getConfiguredProjectByCanonicalConfigFilePath;
-        private findExternalProjectByProjectName;
-        private convertConfigFileContentToProjectOptions;
-        /** Get a filename if the language service exceeds the maximum allowed program size; otherwise returns undefined. */
-        private getFilenameForExceededTotalSizeLimitForNonTsFiles;
-        private createExternalProject;
-        private sendProjectTelemetry;
-        private addFilesToNonInferredProjectAndUpdateGraph;
-        private createConfiguredProject;
-        private updateNonInferredProjectFiles;
-        private updateNonInferredProject;
-        private sendConfigFileDiagEvent;
-        private getOrCreateInferredProjectForProjectRootPathIfEnabled;
-        private getOrCreateSingleInferredProjectIfEnabled;
-        private getOrCreateSingleInferredWithoutProjectRoot;
-        private createInferredProject;
-        getScriptInfo(uncheckedFileName: string): ScriptInfo | undefined;
-        private watchClosedScriptInfo;
-        private stopWatchingScriptInfo;
-        getOrCreateScriptInfoForNormalizedPath(fileName: NormalizedPath, openedByClient: boolean, fileContent?: string, scriptKind?: ScriptKind, hasMixedContent?: boolean, hostToQueryFileExistsOn?: {
-            fileExists(path: string): boolean;
-        }): ScriptInfo | undefined;
-        private getOrCreateScriptInfoWorker;
-        /**
-         * This gets the script info for the normalized path. If the path is not rooted disk path then the open script info with project root context is preferred
-         */
-        getScriptInfoForNormalizedPath(fileName: NormalizedPath): ScriptInfo | undefined;
-        getScriptInfoForPath(fileName: Path): ScriptInfo | undefined;
-        setHostConfiguration(args: protocol.ConfigureRequestArguments): void;
-        closeLog(): void;
-        /**
-         * This function rebuilds the project for every file opened by the client
-         * This does not reload contents of open files from disk. But we could do that if needed
-         */
-        reloadProjects(): void;
-        private delayReloadConfiguredProjectForFiles;
-        /**
-         * This function goes through all the openFiles and tries to file the config file for them.
-         * If the config file is found and it refers to existing project, it reloads it either immediately
-         * or schedules it for reload depending on delayReload option
-         * If the there is no existing project it just opens the configured project for the config file
-         * reloadForInfo provides a way to filter out files to reload configured project for
-         */
-        private reloadConfiguredProjectForFiles;
-        /**
-         * Remove the root of inferred project if script info is part of another project
-         */
-        private removeRootOfInferredProjectIfNowPartOfOtherProject;
-        /**
-         * This function is to update the project structure for every inferred project.
-         * It is called on the premise that all the configured projects are
-         * up to date.
-         * This will go through open files and assign them to inferred project if open file is not part of any other project
-         * After that all the inferred project graphs are updated
-         */
-        private ensureProjectForOpenFiles;
-        /**
-         * Open file whose contents is managed by the client
-         * @param filename is absolute pathname
-         * @param fileContent is a known version of the file content that is more up to date than the one on disk
-         */
-        openClientFile(fileName: string, fileContent?: string, scriptKind?: ScriptKind, projectRootPath?: string): OpenConfiguredProjectResult;
-        private findExternalProjectContainingOpenScriptInfo;
-        openClientFileWithNormalizedPath(fileName: NormalizedPath, fileContent?: string, scriptKind?: ScriptKind, hasMixedContent?: boolean, projectRootPath?: NormalizedPath): OpenConfiguredProjectResult;
-        private telemetryOnOpenFile;
-        /**
-         * Close file whose contents is managed by the client
-         * @param filename is absolute pathname
-         */
-        closeClientFile(uncheckedFileName: string): void;
-        private collectChanges;
-        private closeConfiguredProjectReferencedFromExternalProject;
-        closeExternalProject(uncheckedFileName: string): void;
-        openExternalProjects(projects: protocol.ExternalProject[]): void;
-        /** Makes a filename safe to insert in a RegExp */
-        private static readonly filenameEscapeRegexp;
-        private static escapeFilenameForRegex;
-        resetSafeList(): void;
-        applySafeList(proj: protocol.ExternalProject): NormalizedPath[];
-        openExternalProject(proj: protocol.ExternalProject): void;
-        hasDeferredExtension(): boolean;
-    }
-}
-declare namespace ts.server {
-    interface ServerCancellationToken extends HostCancellationToken {
-        setRequest(requestId: number): void;
-        resetRequest(requestId: number): void;
-    }
-    const nullCancellationToken: ServerCancellationToken;
-    interface PendingErrorCheck {
-        fileName: NormalizedPath;
-        project: Project;
-    }
-    type CommandNames = protocol.CommandTypes;
-    const CommandNames: any;
-    function formatMessage<T extends protocol.Message>(msg: T, logger: Logger, byteLength: (s: string, encoding: string) => number, newLine: string): string;
-    type Event = <T extends object>(body: T, eventName: string) => void;
-    interface EventSender {
-        event: Event;
-    }
-    interface SessionOptions {
-        host: ServerHost;
-        cancellationToken: ServerCancellationToken;
-        useSingleInferredProject: boolean;
-        useInferredProjectPerProjectRoot: boolean;
-        typingsInstaller: ITypingsInstaller;
-        byteLength: (buf: string, encoding?: string) => number;
-        hrtime: (start?: number[]) => number[];
-        logger: Logger;
-        /**
-         * If falsy, all events are suppressed.
-         */
-        canUseEvents: boolean;
-        eventHandler?: ProjectServiceEventHandler;
-        /** Has no effect if eventHandler is also specified. */
-        suppressDiagnosticEvents?: boolean;
-        syntaxOnly?: boolean;
-        throttleWaitMilliseconds?: number;
-        noGetErrOnBackgroundUpdate?: boolean;
-        globalPlugins?: ReadonlyArray<string>;
-        pluginProbeLocations?: ReadonlyArray<string>;
-        allowLocalPluginLoads?: boolean;
-    }
-    class Session implements EventSender {
-        private readonly gcTimer;
-        protected projectService: ProjectService;
-        private changeSeq;
-        private currentRequestId;
-        private errorCheck;
-        protected host: ServerHost;
-        private readonly cancellationToken;
-        protected readonly typingsInstaller: ITypingsInstaller;
-        protected byteLength: (buf: string, encoding?: string) => number;
-        private hrtime;
-        protected logger: Logger;
-        protected canUseEvents: boolean;
-        private suppressDiagnosticEvents?;
-        private eventHandler;
-        private readonly noGetErrOnBackgroundUpdate?;
-        constructor(opts: SessionOptions);
-        private sendRequestCompletedEvent;
-        private defaultEventHandler;
-        private projectsUpdatedInBackgroundEvent;
-        logError(err: Error, cmd: string): void;
-        send(msg: protocol.Message): void;
-        event<T extends object>(body: T, eventName: string): void;
-        /** @deprecated */
-        output(info: any, cmdName: string, reqSeq?: number, errorMsg?: string): void;
-        private doOutput;
-        private semanticCheck;
-        private syntacticCheck;
-        private suggestionCheck;
-        private sendDiagnosticsEvent;
-        /** It is the caller's responsibility to verify that `!this.suppressDiagnosticEvents`. */
-        private updateErrorCheck;
-        private cleanProjects;
-        private cleanup;
-        private getEncodedSemanticClassifications;
-        private getProject;
-        private getConfigFileAndProject;
-        private getConfigFileDiagnostics;
-        private convertToDiagnosticsWithLinePositionFromDiagnosticFile;
-        private getCompilerOptionsDiagnostics;
-        private convertToDiagnosticsWithLinePosition;
-        private getDiagnosticsWorker;
-        private getDefinition;
-        private getDefinitionAndBoundSpan;
-        private mapDefinitionInfo;
-        private static mapToOriginalLocation;
-        private toFileSpan;
-        private getTypeDefinition;
-        private getImplementation;
-        private getOccurrences;
-        private getSyntacticDiagnosticsSync;
-        private getSemanticDiagnosticsSync;
-        private getSuggestionDiagnosticsSync;
-        private getJsxClosingTag;
-        private getDocumentHighlights;
-        private setCompilerOptionsForInferredProjects;
-        private getProjectInfo;
-        private getProjectInfoWorker;
-        private getRenameInfo;
-        private getProjects;
-        private getDefaultProject;
-        private getRenameLocations;
-        private getReferences;
-        /**
-         * @param fileName is the name of the file to be opened
-         * @param fileContent is a version of the file content that is known to be more up to date than the one on disk
-         */
-        private openClientFile;
-        private getPosition;
-        private getPositionInFile;
-        private getFileAndProject;
-        private getFileAndLanguageServiceForSyntacticOperation;
-        private getFileAndProjectWorker;
-        private getOutliningSpans;
-        private getTodoComments;
-        private getDocCommentTemplate;
-        private getSpanOfEnclosingComment;
-        private getIndentation;
-        private getBreakpointStatement;
-        private getNameOrDottedNameSpan;
-        private isValidBraceCompletion;
-        private getQuickInfoWorker;
-        private getFormattingEditsForRange;
-        private getFormattingEditsForRangeFull;
-        private getFormattingEditsForDocumentFull;
-        private getFormattingEditsAfterKeystrokeFull;
-        private getFormattingEditsAfterKeystroke;
-        private getCompletions;
-        private getCompletionEntryDetails;
-        private getCompileOnSaveAffectedFileList;
-        private emitFile;
-        private getSignatureHelpItems;
-        private createCheckList;
-        private getDiagnostics;
-        private change;
-        private reload;
-        private saveToTmp;
-        private closeClientFile;
-        private mapLocationNavigationBarItems;
-        private getNavigationBarItems;
-        private toLocationNavigationTree;
-        private toLocationTextSpan;
-        private getNavigationTree;
-        private getNavigateToItems;
-        private getSupportedCodeFixes;
-        private isLocation;
-        private extractPositionAndRange;
-        private getApplicableRefactors;
-        private getEditsForRefactor;
-        private organizeImports;
-        private getEditsForFileRename;
-        private getCodeFixes;
-        private getCombinedCodeFix;
-        private applyCodeActionCommand;
-        private getStartAndEndPosition;
-        private mapCodeAction;
-        private mapCodeFixAction;
-        private mapTextChangesToCodeEdits;
-        private convertTextChangeToCodeEdit;
-        private getBraceMatching;
-        private getDiagnosticsForProject;
-        getCanonicalFileName(fileName: string): string;
-        exit(): void;
-        private notRequired;
-        private requiredResponse;
-        private handlers;
-        addProtocolHandler(command: string, handler: (request: protocol.Request) => HandlerResponse): void;
-        private setCurrentRequest;
-        private resetCurrentRequest;
-        executeWithRequestId<T>(requestId: number, f: () => T): T;
-        executeCommand(request: protocol.Request): HandlerResponse;
-        onMessage(message: string): void;
-        private getFormatOptions;
-        private getPreferences;
-    }
-    interface HandlerResponse {
-        response?: {};
-        responseRequired?: boolean;
-    }
-}
-
+declare namespace ts {
+    /** Gets a timestamp with (at least) ms resolution */
+    const timestamp: () => number;
+}
+/** Performance measurements for the compiler. */
+declare namespace ts.performance {
+    /**
+     * Marks a performance event.
+     *
+     * @param markName The name of the mark.
+     */
+    function mark(markName: string): void;
+    /**
+     * Adds a performance measurement with the specified name.
+     *
+     * @param measureName The name of the performance measurement.
+     * @param startMarkName The name of the starting mark. If not supplied, the point at which the
+     *      profiler was enabled is used.
+     * @param endMarkName The name of the ending mark. If not supplied, the current timestamp is
+     *      used.
+     */
+    function measure(measureName: string, startMarkName?: string, endMarkName?: string): void;
+    /**
+     * Gets the number of times a marker was encountered.
+     *
+     * @param markName The name of the mark.
+     */
+    function getCount(markName: string): number;
+    /**
+     * Gets the total duration of all measurements with the supplied name.
+     *
+     * @param measureName The name of the measure whose durations should be accumulated.
+     */
+    function getDuration(measureName: string): number;
+    /**
+     * Iterate over each measure, performing some action
+     *
+     * @param cb The action to perform for each measure
+     */
+    function forEachMeasure(cb: (measureName: string, duration: number) => void): void;
+    /** Enables (and resets) performance measurements for the compiler. */
+    function enable(): void;
+    /** Disables performance measurements for the compiler. */
+    function disable(): void;
+}
+declare namespace ts {
+    const versionMajorMinor = "3.0";
+    /** The version of the TypeScript compiler release */
+    const version: string;
+}
+declare namespace ts {
+    /**
+     * Type of objects whose values are all of the same type.
+     * The `in` and `for-in` operators can *not* be safely used,
+     * since `Object.prototype` may be modified by outside code.
+     */
+    interface MapLike<T> {
+        [index: string]: T;
+    }
+    interface SortedArray<T> extends Array<T> {
+        " __sortedArrayBrand": any;
+    }
+}
+declare namespace ts {
+    type EqualityComparer<T> = (a: T, b: T) => boolean;
+    type Comparer<T> = (a: T, b: T) => Comparison;
+    enum Comparison {
+        LessThan = -1,
+        EqualTo = 0,
+        GreaterThan = 1
+    }
+    /** ES6 Map interface, only read methods included. */
+    interface ReadonlyMap<T> {
+        get(key: string): T | undefined;
+        has(key: string): boolean;
+        forEach(action: (value: T, key: string) => void): void;
+        readonly size: number;
+        keys(): Iterator<string>;
+        values(): Iterator<T>;
+        entries(): Iterator<[string, T]>;
+    }
+    /** ES6 Map interface. */
+    interface Map<T> extends ReadonlyMap<T> {
+        set(key: string, value: T): this;
+        delete(key: string): boolean;
+        clear(): void;
+    }
+    /** ES6 Iterator type. */
+    interface Iterator<T> {
+        next(): {
+            value: T;
+            done: false;
+        } | {
+            value: never;
+            done: true;
+        };
+    }
+    /** Array that is only intended to be pushed to, never read. */
+    interface Push<T> {
+        push(...values: T[]): void;
+    }
+    /** Create a new map. If a template object is provided, the map will copy entries from it. */
+    function createMap<T>(): Map<T>;
+    function createMapFromEntries<T>(entries: [string, T][]): Map<T>;
+    function createMapFromTemplate<T>(template: MapLike<T>): Map<T>;
+    const MapCtr: new <T>() => Map<T>;
+    function length(array: ReadonlyArray<any> | undefined): number;
+    /**
+     * Iterates through 'array' by index and performs the callback on each element of array until the callback
+     * returns a truthy value, then returns that value.
+     * If no such value is found, the callback is applied to each element of array and undefined is returned.
+     */
+    function forEach<T, U>(array: ReadonlyArray<T> | undefined, callback: (element: T, index: number) => U | undefined): U | undefined;
+    /** Like `forEach`, but suitable for use with numbers and strings (which may be falsy). */
+    function firstDefined<T, U>(array: ReadonlyArray<T> | undefined, callback: (element: T, index: number) => U | undefined): U | undefined;
+    function firstDefinedIterator<T, U>(iter: Iterator<T>, callback: (element: T) => U | undefined): U | undefined;
+    function zipWith<T, U, V>(arrayA: ReadonlyArray<T>, arrayB: ReadonlyArray<U>, callback: (a: T, b: U, index: number) => V): V[];
+    function zipToIterator<T, U>(arrayA: ReadonlyArray<T>, arrayB: ReadonlyArray<U>): Iterator<[T, U]>;
+    function zipToMap<T>(keys: ReadonlyArray<string>, values: ReadonlyArray<T>): Map<T>;
+    /**
+     * Iterates through `array` by index and performs the callback on each element of array until the callback
+     * returns a falsey value, then returns false.
+     * If no such value is found, the callback is applied to each element of array and `true` is returned.
+     */
+    function every<T>(array: ReadonlyArray<T>, callback: (element: T, index: number) => boolean): boolean;
+    /** Works like Array.prototype.find, returning `undefined` if no element satisfying the predicate is found. */
+    function find<T, U extends T>(array: ReadonlyArray<T>, predicate: (element: T, index: number) => element is U): U | undefined;
+    function find<T>(array: ReadonlyArray<T>, predicate: (element: T, index: number) => boolean): T | undefined;
+    function findLast<T, U extends T>(array: ReadonlyArray<T>, predicate: (element: T, index: number) => element is U): U | undefined;
+    function findLast<T>(array: ReadonlyArray<T>, predicate: (element: T, index: number) => boolean): T | undefined;
+    /** Works like Array.prototype.findIndex, returning `-1` if no element satisfying the predicate is found. */
+    function findIndex<T>(array: ReadonlyArray<T>, predicate: (element: T, index: number) => boolean, startIndex?: number): number;
+    function findLastIndex<T>(array: ReadonlyArray<T>, predicate: (element: T, index: number) => boolean, startIndex?: number): number;
+    /**
+     * Returns the first truthy result of `callback`, or else fails.
+     * This is like `forEach`, but never returns undefined.
+     */
+    function findMap<T, U>(array: ReadonlyArray<T>, callback: (element: T, index: number) => U | undefined): U;
+    function contains<T>(array: ReadonlyArray<T> | undefined, value: T, equalityComparer?: EqualityComparer<T>): boolean;
+    function arraysEqual<T>(a: ReadonlyArray<T>, b: ReadonlyArray<T>, equalityComparer?: EqualityComparer<T>): boolean;
+    function indexOfAnyCharCode(text: string, charCodes: ReadonlyArray<number>, start?: number): number;
+    function countWhere<T>(array: ReadonlyArray<T>, predicate: (x: T, i: number) => boolean): number;
+    /**
+     * Filters an array by a predicate function. Returns the same array instance if the predicate is
+     * true for all elements, otherwise returns a new array instance containing the filtered subset.
+     */
+    function filter<T, U extends T>(array: T[], f: (x: T) => x is U): U[];
+    function filter<T>(array: T[], f: (x: T) => boolean): T[];
+    function filter<T, U extends T>(array: ReadonlyArray<T>, f: (x: T) => x is U): ReadonlyArray<U>;
+    function filter<T, U extends T>(array: ReadonlyArray<T>, f: (x: T) => boolean): ReadonlyArray<T>;
+    function filter<T, U extends T>(array: T[] | undefined, f: (x: T) => x is U): U[] | undefined;
+    function filter<T>(array: T[] | undefined, f: (x: T) => boolean): T[] | undefined;
+    function filter<T, U extends T>(array: ReadonlyArray<T> | undefined, f: (x: T) => x is U): ReadonlyArray<U> | undefined;
+    function filter<T, U extends T>(array: ReadonlyArray<T> | undefined, f: (x: T) => boolean): ReadonlyArray<T> | undefined;
+    function filterMutate<T>(array: T[], f: (x: T, i: number, array: T[]) => boolean): void;
+    function clear(array: {}[]): void;
+    function map<T, U>(array: ReadonlyArray<T>, f: (x: T, i: number) => U): U[];
+    function map<T, U>(array: ReadonlyArray<T> | undefined, f: (x: T, i: number) => U): U[] | undefined;
+    function mapIterator<T, U>(iter: Iterator<T>, mapFn: (x: T) => U): Iterator<U>;
+    function sameMap<T>(array: T[], f: (x: T, i: number) => T): T[];
+    function sameMap<T>(array: ReadonlyArray<T>, f: (x: T, i: number) => T): ReadonlyArray<T>;
+    function sameMap<T>(array: T[] | undefined, f: (x: T, i: number) => T): T[] | undefined;
+    function sameMap<T>(array: ReadonlyArray<T> | undefined, f: (x: T, i: number) => T): ReadonlyArray<T> | undefined;
+    /**
+     * Flattens an array containing a mix of array or non-array elements.
+     *
+     * @param array The array to flatten.
+     */
+    function flatten<T>(array: ReadonlyArray<T | ReadonlyArray<T> | undefined>): T[];
+    function flatten<T>(array: ReadonlyArray<T | ReadonlyArray<T> | undefined> | undefined): T[] | undefined;
+    /**
+     * Maps an array. If the mapped value is an array, it is spread into the result.
+     *
+     * @param array The array to map.
+     * @param mapfn The callback used to map the result into one or more values.
+     */
+    function flatMap<T, U>(array: ReadonlyArray<T>, mapfn: (x: T, i: number) => U | ReadonlyArray<U> | undefined): U[];
+    function flatMap<T, U>(array: ReadonlyArray<T> | undefined, mapfn: (x: T, i: number) => U | ReadonlyArray<U> | undefined): U[] | undefined;
+    function flatMapIterator<T, U>(iter: Iterator<T>, mapfn: (x: T) => U[] | Iterator<U> | undefined): Iterator<U>;
+    /**
+     * Maps an array. If the mapped value is an array, it is spread into the result.
+     * Avoids allocation if all elements map to themselves.
+     *
+     * @param array The array to map.
+     * @param mapfn The callback used to map the result into one or more values.
+     */
+    function sameFlatMap<T>(array: T[], mapfn: (x: T, i: number) => T | ReadonlyArray<T>): T[];
+    function sameFlatMap<T>(array: ReadonlyArray<T>, mapfn: (x: T, i: number) => T | ReadonlyArray<T>): ReadonlyArray<T>;
+    function mapAllOrFail<T, U>(array: ReadonlyArray<T>, mapFn: (x: T, i: number) => U | undefined): U[] | undefined;
+    function mapDefined<T, U>(array: ReadonlyArray<T> | undefined, mapFn: (x: T, i: number) => U | undefined): U[];
+    function mapDefinedIterator<T, U>(iter: Iterator<T>, mapFn: (x: T) => U | undefined): Iterator<U>;
+    const emptyIterator: Iterator<never>;
+    function singleIterator<T>(value: T): Iterator<T>;
+    /**
+     * Maps contiguous spans of values with the same key.
+     *
+     * @param array The array to map.
+     * @param keyfn A callback used to select the key for an element.
+     * @param mapfn A callback used to map a contiguous chunk of values to a single value.
+     */
+    function spanMap<T, K, U>(array: ReadonlyArray<T>, keyfn: (x: T, i: number) => K, mapfn: (chunk: T[], key: K, start: number, end: number) => U): U[];
+    function spanMap<T, K, U>(array: ReadonlyArray<T> | undefined, keyfn: (x: T, i: number) => K, mapfn: (chunk: T[], key: K, start: number, end: number) => U): U[] | undefined;
+    function mapEntries<T, U>(map: ReadonlyMap<T>, f: (key: string, value: T) => [string, U]): Map<U>;
+    function mapEntries<T, U>(map: ReadonlyMap<T> | undefined, f: (key: string, value: T) => [string, U]): Map<U> | undefined;
+    function some<T>(array: ReadonlyArray<T> | undefined): array is ReadonlyArray<T>;
+    function some<T>(array: ReadonlyArray<T> | undefined, predicate: (value: T) => boolean): boolean;
+    /** Calls the callback with (start, afterEnd) index pairs for each range where 'pred' is true. */
+    function getRangesWhere<T>(arr: ReadonlyArray<T>, pred: (t: T) => boolean, cb: (start: number, afterEnd: number) => void): void;
+    function concatenate<T>(array1: T[], array2: T[]): T[];
+    function concatenate<T>(array1: ReadonlyArray<T>, array2: ReadonlyArray<T>): ReadonlyArray<T>;
+    function concatenate<T>(array1: T[] | undefined, array2: T[] | undefined): T[];
+    function concatenate<T>(array1: ReadonlyArray<T> | undefined, array2: ReadonlyArray<T> | undefined): ReadonlyArray<T>;
+    /**
+     * Deduplicates an unsorted array.
+     * @param equalityComparer An optional `EqualityComparer` used to determine if two values are duplicates.
+     * @param comparer An optional `Comparer` used to sort entries before comparison, though the
+     * result will remain in the original order in `array`.
+     */
+    function deduplicate<T>(array: ReadonlyArray<T>, equalityComparer?: EqualityComparer<T>, comparer?: Comparer<T>): T[];
+    function deduplicate<T>(array: ReadonlyArray<T> | undefined, equalityComparer?: EqualityComparer<T>, comparer?: Comparer<T>): T[] | undefined;
+    function insertSorted<T>(array: SortedArray<T>, insert: T, compare: Comparer<T>): void;
+    function sortAndDeduplicate<T>(array: ReadonlyArray<T>, comparer: Comparer<T>, equalityComparer?: EqualityComparer<T>): T[];
+    function arrayIsEqualTo<T>(array1: ReadonlyArray<T> | undefined, array2: ReadonlyArray<T> | undefined, equalityComparer?: (a: T, b: T) => boolean): boolean;
+    /**
+     * Compacts an array, removing any falsey elements.
+     */
+    function compact<T>(array: T[]): T[];
+    function compact<T>(array: ReadonlyArray<T>): ReadonlyArray<T>;
+    /**
+     * Gets the relative complement of `arrayA` with respect to `arrayB`, returning the elements that
+     * are not present in `arrayA` but are present in `arrayB`. Assumes both arrays are sorted
+     * based on the provided comparer.
+     */
+    function relativeComplement<T>(arrayA: T[] | undefined, arrayB: T[] | undefined, comparer: Comparer<T>): T[] | undefined;
+    function sum<T extends Record<K, number>, K extends string>(array: ReadonlyArray<T>, prop: K): number;
+    /**
+     * Appends a value to an array, returning the array.
+     *
+     * @param to The array to which `value` is to be appended. If `to` is `undefined`, a new array
+     * is created if `value` was appended.
+     * @param value The value to append to the array. If `value` is `undefined`, nothing is
+     * appended.
+     */
+    function append<T>(to: T[], value: T | undefined): T[];
+    function append<T>(to: T[] | undefined, value: T): T[];
+    function append<T>(to: T[] | undefined, value: T | undefined): T[] | undefined;
+    function append<T>(to: Push<T>, value: T | undefined): void;
+    /**
+     * Appends a range of value to an array, returning the array.
+     *
+     * @param to The array to which `value` is to be appended. If `to` is `undefined`, a new array
+     * is created if `value` was appended.
+     * @param from The values to append to the array. If `from` is `undefined`, nothing is
+     * appended. If an element of `from` is `undefined`, that element is not appended.
+     * @param start The offset in `from` at which to start copying values.
+     * @param end The offset in `from` at which to stop copying values (non-inclusive).
+     */
+    function addRange<T>(to: T[], from: ReadonlyArray<T> | undefined, start?: number, end?: number): T[];
+    function addRange<T>(to: T[] | undefined, from: ReadonlyArray<T> | undefined, start?: number, end?: number): T[] | undefined;
+    /**
+     * @return Whether the value was added.
+     */
+    function pushIfUnique<T>(array: T[], toAdd: T, equalityComparer?: EqualityComparer<T>): boolean;
+    /**
+     * Unlike `pushIfUnique`, this can take `undefined` as an input, and returns a new array.
+     */
+    function appendIfUnique<T>(array: T[] | undefined, toAdd: T, equalityComparer?: EqualityComparer<T>): T[];
+    /**
+     * Returns a new sorted array.
+     */
+    function sort<T>(array: ReadonlyArray<T>, comparer: Comparer<T>): T[];
+    function best<T>(iter: Iterator<T>, isBetter: (a: T, b: T) => boolean): T | undefined;
+    function arrayIterator<T>(array: ReadonlyArray<T>): Iterator<T>;
+    /**
+     * Stable sort of an array. Elements equal to each other maintain their relative position in the array.
+     */
+    function stableSort<T>(array: ReadonlyArray<T>, comparer: Comparer<T>): T[];
+    function rangeEquals<T>(array1: ReadonlyArray<T>, array2: ReadonlyArray<T>, pos: number, end: number): boolean;
+    /**
+     * Returns the element at a specific offset in an array if non-empty, `undefined` otherwise.
+     * A negative offset indicates the element should be retrieved from the end of the array.
+     */
+    function elementAt<T>(array: ReadonlyArray<T> | undefined, offset: number): T | undefined;
+    /**
+     * Returns the first element of an array if non-empty, `undefined` otherwise.
+     */
+    function firstOrUndefined<T>(array: ReadonlyArray<T>): T | undefined;
+    function first<T>(array: ReadonlyArray<T>): T;
+    /**
+     * Returns the last element of an array if non-empty, `undefined` otherwise.
+     */
+    function lastOrUndefined<T>(array: ReadonlyArray<T>): T | undefined;
+    function last<T>(array: ReadonlyArray<T>): T;
+    /**
+     * Returns the only element of an array if it contains only one element, `undefined` otherwise.
+     */
+    function singleOrUndefined<T>(array: ReadonlyArray<T> | undefined): T | undefined;
+    /**
+     * Returns the only element of an array if it contains only one element; otheriwse, returns the
+     * array.
+     */
+    function singleOrMany<T>(array: T[]): T | T[];
+    function singleOrMany<T>(array: ReadonlyArray<T>): T | ReadonlyArray<T>;
+    function singleOrMany<T>(array: T[] | undefined): T | T[] | undefined;
+    function singleOrMany<T>(array: ReadonlyArray<T> | undefined): T | ReadonlyArray<T> | undefined;
+    function replaceElement<T>(array: ReadonlyArray<T>, index: number, value: T): T[];
+    /**
+     * Performs a binary search, finding the index at which `value` occurs in `array`.
+     * If no such index is found, returns the 2's-complement of first index at which
+     * `array[index]` exceeds `value`.
+     * @param array A sorted array whose first element must be no larger than number
+     * @param value The value to be searched for in the array.
+     * @param keySelector A callback used to select the search key from `value` and each element of
+     * `array`.
+     * @param keyComparer A callback used to compare two keys in a sorted array.
+     * @param offset An offset into `array` at which to start the search.
+     */
+    function binarySearch<T, U>(array: ReadonlyArray<T>, value: T, keySelector: (v: T) => U, keyComparer: Comparer<U>, offset?: number): number;
+    function reduceLeft<T, U>(array: ReadonlyArray<T> | undefined, f: (memo: U, value: T, i: number) => U, initial: U, start?: number, count?: number): U;
+    function reduceLeft<T>(array: ReadonlyArray<T>, f: (memo: T, value: T, i: number) => T): T | undefined;
+    /**
+     * Indicates whether a map-like contains an own property with the specified key.
+     *
+     * @param map A map-like.
+     * @param key A property key.
+     */
+    function hasProperty(map: MapLike<any>, key: string): boolean;
+    /**
+     * Gets the value of an owned property in a map-like.
+     *
+     * @param map A map-like.
+     * @param key A property key.
+     */
+    function getProperty<T>(map: MapLike<T>, key: string): T | undefined;
+    /**
+     * Gets the owned, enumerable property keys of a map-like.
+     */
+    function getOwnKeys<T>(map: MapLike<T>): string[];
+    function getOwnValues<T>(sparseArray: T[]): T[];
+    /** Shims `Array.from`. */
+    function arrayFrom<T, U>(iterator: Iterator<T>, map: (t: T) => U): U[];
+    function arrayFrom<T>(iterator: Iterator<T>): T[];
+    function assign<T extends object>(t: T, ...args: (T | undefined)[]): T;
+    /**
+     * Performs a shallow equality comparison of the contents of two map-likes.
+     *
+     * @param left A map-like whose properties should be compared.
+     * @param right A map-like whose properties should be compared.
+     */
+    function equalOwnProperties<T>(left: MapLike<T> | undefined, right: MapLike<T> | undefined, equalityComparer?: EqualityComparer<T>): boolean;
+    /**
+     * Creates a map from the elements of an array.
+     *
+     * @param array the array of input elements.
+     * @param makeKey a function that produces a key for a given element.
+     *
+     * This function makes no effort to avoid collisions; if any two elements produce
+     * the same key with the given 'makeKey' function, then the element with the higher
+     * index in the array will be the one associated with the produced key.
+     */
+    function arrayToMap<T>(array: ReadonlyArray<T>, makeKey: (value: T) => string | undefined): Map<T>;
+    function arrayToMap<T, U>(array: ReadonlyArray<T>, makeKey: (value: T) => string | undefined, makeValue: (value: T) => U): Map<U>;
+    function arrayToNumericMap<T>(array: ReadonlyArray<T>, makeKey: (value: T) => number): T[];
+    function arrayToNumericMap<T, U>(array: ReadonlyArray<T>, makeKey: (value: T) => number, makeValue: (value: T) => U): U[];
+    function arrayToMultiMap<T>(values: ReadonlyArray<T>, makeKey: (value: T) => string): MultiMap<T>;
+    function arrayToMultiMap<T, U>(values: ReadonlyArray<T>, makeKey: (value: T) => string, makeValue: (value: T) => U): MultiMap<U>;
+    function group<T>(values: ReadonlyArray<T>, getGroupId: (value: T) => string): ReadonlyArray<ReadonlyArray<T>>;
+    function clone<T>(object: T): T;
+    function extend<T1, T2>(first: T1, second: T2): T1 & T2;
+    interface MultiMap<T> extends Map<T[]> {
+        /**
+         * Adds the value to an array of values associated with the key, and returns the array.
+         * Creates the array if it does not already exist.
+         */
+        add(key: string, value: T): T[];
+        /**
+         * Removes a value from an array of values associated with the key.
+         * Does not preserve the order of those values.
+         * Does nothing if `key` is not in `map`, or `value` is not in `map[key]`.
+         */
+        remove(key: string, value: T): void;
+    }
+    function createMultiMap<T>(): MultiMap<T>;
+    /**
+     * Tests whether a value is an array.
+     */
+    function isArray(value: any): value is ReadonlyArray<{}>;
+    function toArray<T>(value: T | T[]): T[];
+    function toArray<T>(value: T | ReadonlyArray<T>): ReadonlyArray<T>;
+    /**
+     * Tests whether a value is string
+     */
+    function isString(text: any): text is string;
+    function tryCast<TOut extends TIn, TIn = any>(value: TIn | undefined, test: (value: TIn) => value is TOut): TOut | undefined;
+    function cast<TOut extends TIn, TIn = any>(value: TIn | undefined, test: (value: TIn) => value is TOut): TOut;
+    /** Does nothing. */
+    function noop(_?: {} | null | undefined): void;
+    /** Do nothing and return false */
+    function returnFalse(): false;
+    /** Do nothing and return true */
+    function returnTrue(): true;
+    /** Returns its argument. */
+    function identity<T>(x: T): T;
+    /** Returns lower case string */
+    function toLowerCase(x: string): string;
+    /** Throws an error because a function is not implemented. */
+    function notImplemented(): never;
+    function memoize<T>(callback: () => T): () => T;
+    /**
+     * High-order function, creates a function that executes a function composition.
+     * For example, `chain(a, b)` is the equivalent of `x => ((a', b') => y => b'(a'(y)))(a(x), b(x))`
+     *
+     * @param args The functions to chain.
+     */
+    function chain<T, U>(...args: ((t: T) => (u: U) => U)[]): (t: T) => (u: U) => U;
+    /**
+     * High-order function, composes functions. Note that functions are composed inside-out;
+     * for example, `compose(a, b)` is the equivalent of `x => b(a(x))`.
+     *
+     * @param args The functions to compose.
+     */
+    function compose<T>(...args: ((t: T) => T)[]): (t: T) => T;
+    enum AssertionLevel {
+        None = 0,
+        Normal = 1,
+        Aggressive = 2,
+        VeryAggressive = 3
+    }
+    /**
+     * Safer version of `Function` which should not be called.
+     * Every function should be assignable to this, but this should not be assignable to every function.
+     */
+    type AnyFunction = (...args: never[]) => void;
+    namespace Debug {
+        let currentAssertionLevel: AssertionLevel;
+        let isDebugging: boolean;
+        function shouldAssert(level: AssertionLevel): boolean;
+        function assert(expression: boolean, message?: string, verboseDebugInfo?: string | (() => string), stackCrawlMark?: AnyFunction): void;
+        function assertEqual<T>(a: T, b: T, msg?: string, msg2?: string): void;
+        function assertLessThan(a: number, b: number, msg?: string): void;
+        function assertLessThanOrEqual(a: number, b: number): void;
+        function assertGreaterThanOrEqual(a: number, b: number): void;
+        function fail(message?: string, stackCrawlMark?: AnyFunction): never;
+        function assertDefined<T>(value: T | null | undefined, message?: string): T;
+        function assertEachDefined<T, A extends ReadonlyArray<T>>(value: A, message?: string): A;
+        function assertNever(member: never, message?: string, stackCrawlMark?: AnyFunction): never;
+        function getFunctionName(func: AnyFunction): any;
+    }
+    function equateValues<T>(a: T, b: T): boolean;
+    /**
+     * Compare the equality of two strings using a case-sensitive ordinal comparison.
+     *
+     * Case-sensitive comparisons compare both strings one code-point at a time using the integer
+     * value of each code-point after applying `toUpperCase` to each string. We always map both
+     * strings to their upper-case form as some unicode characters do not properly round-trip to
+     * lowercase (such as `ẞ` (German sharp capital s)).
+     */
+    function equateStringsCaseInsensitive(a: string, b: string): boolean;
+    /**
+     * Compare the equality of two strings using a case-sensitive ordinal comparison.
+     *
+     * Case-sensitive comparisons compare both strings one code-point at a time using the
+     * integer value of each code-point.
+     */
+    function equateStringsCaseSensitive(a: string, b: string): boolean;
+    /**
+     * Compare two numeric values for their order relative to each other.
+     * To compare strings, use any of the `compareStrings` functions.
+     */
+    function compareValues(a: number | undefined, b: number | undefined): Comparison;
+    function min<T>(a: T, b: T, compare: Comparer<T>): T;
+    /**
+     * Compare two strings using a case-insensitive ordinal comparison.
+     *
+     * Ordinal comparisons are based on the difference between the unicode code points of both
+     * strings. Characters with multiple unicode representations are considered unequal. Ordinal
+     * comparisons provide predictable ordering, but place "a" after "B".
+     *
+     * Case-insensitive comparisons compare both strings one code-point at a time using the integer
+     * value of each code-point after applying `toUpperCase` to each string. We always map both
+     * strings to their upper-case form as some unicode characters do not properly round-trip to
+     * lowercase (such as `ẞ` (German sharp capital s)).
+     */
+    function compareStringsCaseInsensitive(a: string, b: string): Comparison;
+    /**
+     * Compare two strings using a case-sensitive ordinal comparison.
+     *
+     * Ordinal comparisons are based on the difference between the unicode code points of both
+     * strings. Characters with multiple unicode representations are considered unequal. Ordinal
+     * comparisons provide predictable ordering, but place "a" after "B".
+     *
+     * Case-sensitive comparisons compare both strings one code-point at a time using the integer
+     * value of each code-point.
+     */
+    function compareStringsCaseSensitive(a: string | undefined, b: string | undefined): Comparison;
+    function getStringComparer(ignoreCase?: boolean): typeof compareStringsCaseInsensitive;
+    function getUILocale(): string | undefined;
+    function setUILocale(value: string | undefined): void;
+    /**
+     * Compare two strings in a using the case-sensitive sort behavior of the UI locale.
+     *
+     * Ordering is not predictable between different host locales, but is best for displaying
+     * ordered data for UI presentation. Characters with multiple unicode representations may
+     * be considered equal.
+     *
+     * Case-sensitive comparisons compare strings that differ in base characters, or
+     * accents/diacritic marks, or case as unequal.
+     */
+    function compareStringsCaseSensitiveUI(a: string, b: string): Comparison;
+    function compareProperties<T, K extends keyof T>(a: T | undefined, b: T | undefined, key: K, comparer: Comparer<T[K]>): Comparison;
+    /** True is greater than false. */
+    function compareBooleans(a: boolean, b: boolean): Comparison;
+    /**
+     * Given a name and a list of names that are *not* equal to the name, return a spelling suggestion if there is one that is close enough.
+     * Names less than length 3 only check for case-insensitive equality, not Levenshtein distance.
+     *
+     * If there is a candidate that's the same except for case, return that.
+     * If there is a candidate that's within one edit of the name, return that.
+     * Otherwise, return the candidate with the smallest Levenshtein distance,
+     *    except for candidates:
+     *      * With no name
+     *      * Whose length differs from the target name by more than 0.34 of the length of the name.
+     *      * Whose levenshtein distance is more than 0.4 of the length of the name
+     *        (0.4 allows 1 substitution/transposition for every 5 characters,
+     *         and 1 insertion/deletion at 3 characters)
+     */
+    function getSpellingSuggestion<T>(name: string, candidates: T[], getName: (candidate: T) => string | undefined): T | undefined;
+    function endsWith(str: string, suffix: string): boolean;
+    function removeSuffix(str: string, suffix: string): string;
+    function tryRemoveSuffix(str: string, suffix: string): string | undefined;
+    function stringContains(str: string, substring: string): boolean;
+    function fileExtensionIs(path: string, extension: string): boolean;
+    function fileExtensionIsOneOf(path: string, extensions: ReadonlyArray<string>): boolean;
+    /**
+     * Takes a string like "jquery-min.4.2.3" and returns "jquery"
+     */
+    function removeMinAndVersionNumbers(fileName: string): string;
+    /** Remove an item from an array, moving everything to its right one space left. */
+    function orderedRemoveItem<T>(array: T[], item: T): boolean;
+    /** Remove an item by index from an array, moving everything to its right one space left. */
+    function orderedRemoveItemAt<T>(array: T[], index: number): void;
+    function unorderedRemoveItemAt<T>(array: T[], index: number): void;
+    /** Remove the *first* occurrence of `item` from the array. */
+    function unorderedRemoveItem<T>(array: T[], item: T): boolean;
+    type GetCanonicalFileName = (fileName: string) => string;
+    function createGetCanonicalFileName(useCaseSensitiveFileNames: boolean): GetCanonicalFileName;
+    /** Represents a "prefix*suffix" pattern. */
+    interface Pattern {
+        prefix: string;
+        suffix: string;
+    }
+    function patternText({ prefix, suffix }: Pattern): string;
+    /**
+     * Given that candidate matches pattern, returns the text matching the '*'.
+     * E.g.: matchedText(tryParsePattern("foo*baz"), "foobarbaz") === "bar"
+     */
+    function matchedText(pattern: Pattern, candidate: string): string;
+    /** Return the object corresponding to the best pattern to match `candidate`. */
+    function findBestPatternMatch<T>(values: ReadonlyArray<T>, getPattern: (value: T) => Pattern, candidate: string): T | undefined;
+    function startsWith(str: string, prefix: string): boolean;
+    function removePrefix(str: string, prefix: string): string;
+    function tryRemovePrefix(str: string, prefix: string): string | undefined;
+    function and<T>(f: (arg: T) => boolean, g: (arg: T) => boolean): (arg: T) => boolean;
+    function or<T>(f: (arg: T) => boolean, g: (arg: T) => boolean): (arg: T) => boolean;
+    function assertTypeIsNever(_: never): void;
+    function singleElementArray<T>(t: T | undefined): T[] | undefined;
+    function enumerateInsertsAndDeletes<T, U>(newItems: ReadonlyArray<T>, oldItems: ReadonlyArray<U>, comparer: (a: T, b: U) => Comparison, inserted: (newItem: T) => void, deleted: (oldItem: U) => void, unchanged?: (oldItem: U, newItem: T) => void): void;
+}
+//# sourceMappingURL=core.d.ts.map
+declare namespace ts {
+    type Path = string & {
+        __pathBrand: any;
+    };
+    interface TextRange {
+        pos: number;
+        end: number;
+    }
+    type JsDocSyntaxKind = SyntaxKind.EndOfFileToken | SyntaxKind.WhitespaceTrivia | SyntaxKind.AtToken | SyntaxKind.NewLineTrivia | SyntaxKind.AsteriskToken | SyntaxKind.OpenBraceToken | SyntaxKind.CloseBraceToken | SyntaxKind.LessThanToken | SyntaxKind.OpenBracketToken | SyntaxKind.CloseBracketToken | SyntaxKind.EqualsToken | SyntaxKind.CommaToken | SyntaxKind.DotToken | SyntaxKind.Identifier | SyntaxKind.NoSubstitutionTemplateLiteral | SyntaxKind.Unknown;
+    type JsxTokenSyntaxKind = SyntaxKind.LessThanSlashToken | SyntaxKind.EndOfFileToken | SyntaxKind.ConflictMarkerTrivia | SyntaxKind.JsxText | SyntaxKind.JsxTextAllWhiteSpaces | SyntaxKind.OpenBraceToken | SyntaxKind.LessThanToken;
+    enum SyntaxKind {
+        Unknown = 0,
+        EndOfFileToken = 1,
+        SingleLineCommentTrivia = 2,
+        MultiLineCommentTrivia = 3,
+        NewLineTrivia = 4,
+        WhitespaceTrivia = 5,
+        ShebangTrivia = 6,
+        ConflictMarkerTrivia = 7,
+        NumericLiteral = 8,
+        StringLiteral = 9,
+        JsxText = 10,
+        JsxTextAllWhiteSpaces = 11,
+        RegularExpressionLiteral = 12,
+        NoSubstitutionTemplateLiteral = 13,
+        TemplateHead = 14,
+        TemplateMiddle = 15,
+        TemplateTail = 16,
+        OpenBraceToken = 17,
+        CloseBraceToken = 18,
+        OpenParenToken = 19,
+        CloseParenToken = 20,
+        OpenBracketToken = 21,
+        CloseBracketToken = 22,
+        DotToken = 23,
+        DotDotDotToken = 24,
+        SemicolonToken = 25,
+        CommaToken = 26,
+        LessThanToken = 27,
+        LessThanSlashToken = 28,
+        GreaterThanToken = 29,
+        LessThanEqualsToken = 30,
+        GreaterThanEqualsToken = 31,
+        EqualsEqualsToken = 32,
+        ExclamationEqualsToken = 33,
+        EqualsEqualsEqualsToken = 34,
+        ExclamationEqualsEqualsToken = 35,
+        EqualsGreaterThanToken = 36,
+        PlusToken = 37,
+        MinusToken = 38,
+        AsteriskToken = 39,
+        AsteriskAsteriskToken = 40,
+        SlashToken = 41,
+        PercentToken = 42,
+        PlusPlusToken = 43,
+        MinusMinusToken = 44,
+        LessThanLessThanToken = 45,
+        GreaterThanGreaterThanToken = 46,
+        GreaterThanGreaterThanGreaterThanToken = 47,
+        AmpersandToken = 48,
+        BarToken = 49,
+        CaretToken = 50,
+        ExclamationToken = 51,
+        TildeToken = 52,
+        AmpersandAmpersandToken = 53,
+        BarBarToken = 54,
+        QuestionToken = 55,
+        ColonToken = 56,
+        AtToken = 57,
+        EqualsToken = 58,
+        PlusEqualsToken = 59,
+        MinusEqualsToken = 60,
+        AsteriskEqualsToken = 61,
+        AsteriskAsteriskEqualsToken = 62,
+        SlashEqualsToken = 63,
+        PercentEqualsToken = 64,
+        LessThanLessThanEqualsToken = 65,
+        GreaterThanGreaterThanEqualsToken = 66,
+        GreaterThanGreaterThanGreaterThanEqualsToken = 67,
+        AmpersandEqualsToken = 68,
+        BarEqualsToken = 69,
+        CaretEqualsToken = 70,
+        Identifier = 71,
+        BreakKeyword = 72,
+        CaseKeyword = 73,
+        CatchKeyword = 74,
+        ClassKeyword = 75,
+        ConstKeyword = 76,
+        ContinueKeyword = 77,
+        DebuggerKeyword = 78,
+        DefaultKeyword = 79,
+        DeleteKeyword = 80,
+        DoKeyword = 81,
+        ElseKeyword = 82,
+        EnumKeyword = 83,
+        ExportKeyword = 84,
+        ExtendsKeyword = 85,
+        FalseKeyword = 86,
+        FinallyKeyword = 87,
+        ForKeyword = 88,
+        FunctionKeyword = 89,
+        IfKeyword = 90,
+        ImportKeyword = 91,
+        InKeyword = 92,
+        InstanceOfKeyword = 93,
+        NewKeyword = 94,
+        NullKeyword = 95,
+        ReturnKeyword = 96,
+        SuperKeyword = 97,
+        SwitchKeyword = 98,
+        ThisKeyword = 99,
+        ThrowKeyword = 100,
+        TrueKeyword = 101,
+        TryKeyword = 102,
+        TypeOfKeyword = 103,
+        VarKeyword = 104,
+        VoidKeyword = 105,
+        WhileKeyword = 106,
+        WithKeyword = 107,
+        ImplementsKeyword = 108,
+        InterfaceKeyword = 109,
+        LetKeyword = 110,
+        PackageKeyword = 111,
+        PrivateKeyword = 112,
+        ProtectedKeyword = 113,
+        PublicKeyword = 114,
+        StaticKeyword = 115,
+        YieldKeyword = 116,
+        AbstractKeyword = 117,
+        AsKeyword = 118,
+        AnyKeyword = 119,
+        AsyncKeyword = 120,
+        AwaitKeyword = 121,
+        BooleanKeyword = 122,
+        ConstructorKeyword = 123,
+        DeclareKeyword = 124,
+        GetKeyword = 125,
+        InferKeyword = 126,
+        IsKeyword = 127,
+        KeyOfKeyword = 128,
+        ModuleKeyword = 129,
+        NamespaceKeyword = 130,
+        NeverKeyword = 131,
+        ReadonlyKeyword = 132,
+        RequireKeyword = 133,
+        NumberKeyword = 134,
+        ObjectKeyword = 135,
+        SetKeyword = 136,
+        StringKeyword = 137,
+        SymbolKeyword = 138,
+        TypeKeyword = 139,
+        UndefinedKeyword = 140,
+        UniqueKeyword = 141,
+        UnknownKeyword = 142,
+        FromKeyword = 143,
+        GlobalKeyword = 144,
+        OfKeyword = 145,
+        QualifiedName = 146,
+        ComputedPropertyName = 147,
+        TypeParameter = 148,
+        Parameter = 149,
+        Decorator = 150,
+        PropertySignature = 151,
+        PropertyDeclaration = 152,
+        MethodSignature = 153,
+        MethodDeclaration = 154,
+        Constructor = 155,
+        GetAccessor = 156,
+        SetAccessor = 157,
+        CallSignature = 158,
+        ConstructSignature = 159,
+        IndexSignature = 160,
+        TypePredicate = 161,
+        TypeReference = 162,
+        FunctionType = 163,
+        ConstructorType = 164,
+        TypeQuery = 165,
+        TypeLiteral = 166,
+        ArrayType = 167,
+        TupleType = 168,
+        UnionType = 169,
+        IntersectionType = 170,
+        ConditionalType = 171,
+        InferType = 172,
+        ParenthesizedType = 173,
+        ThisType = 174,
+        TypeOperator = 175,
+        IndexedAccessType = 176,
+        MappedType = 177,
+        LiteralType = 178,
+        ImportType = 179,
+        ObjectBindingPattern = 180,
+        ArrayBindingPattern = 181,
+        BindingElement = 182,
+        ArrayLiteralExpression = 183,
+        ObjectLiteralExpression = 184,
+        PropertyAccessExpression = 185,
+        ElementAccessExpression = 186,
+        CallExpression = 187,
+        NewExpression = 188,
+        TaggedTemplateExpression = 189,
+        TypeAssertionExpression = 190,
+        ParenthesizedExpression = 191,
+        FunctionExpression = 192,
+        ArrowFunction = 193,
+        DeleteExpression = 194,
+        TypeOfExpression = 195,
+        VoidExpression = 196,
+        AwaitExpression = 197,
+        PrefixUnaryExpression = 198,
+        PostfixUnaryExpression = 199,
+        BinaryExpression = 200,
+        ConditionalExpression = 201,
+        TemplateExpression = 202,
+        YieldExpression = 203,
+        SpreadElement = 204,
+        ClassExpression = 205,
+        OmittedExpression = 206,
+        ExpressionWithTypeArguments = 207,
+        AsExpression = 208,
+        NonNullExpression = 209,
+        MetaProperty = 210,
+        TemplateSpan = 211,
+        SemicolonClassElement = 212,
+        Block = 213,
+        VariableStatement = 214,
+        EmptyStatement = 215,
+        ExpressionStatement = 216,
+        IfStatement = 217,
+        DoStatement = 218,
+        WhileStatement = 219,
+        ForStatement = 220,
+        ForInStatement = 221,
+        ForOfStatement = 222,
+        ContinueStatement = 223,
+        BreakStatement = 224,
+        ReturnStatement = 225,
+        WithStatement = 226,
+        SwitchStatement = 227,
+        LabeledStatement = 228,
+        ThrowStatement = 229,
+        TryStatement = 230,
+        DebuggerStatement = 231,
+        VariableDeclaration = 232,
+        VariableDeclarationList = 233,
+        FunctionDeclaration = 234,
+        ClassDeclaration = 235,
+        InterfaceDeclaration = 236,
+        TypeAliasDeclaration = 237,
+        EnumDeclaration = 238,
+        ModuleDeclaration = 239,
+        ModuleBlock = 240,
+        CaseBlock = 241,
+        NamespaceExportDeclaration = 242,
+        ImportEqualsDeclaration = 243,
+        ImportDeclaration = 244,
+        ImportClause = 245,
+        NamespaceImport = 246,
+        NamedImports = 247,
+        ImportSpecifier = 248,
+        ExportAssignment = 249,
+        ExportDeclaration = 250,
+        NamedExports = 251,
+        ExportSpecifier = 252,
+        MissingDeclaration = 253,
+        ExternalModuleReference = 254,
+        JsxElement = 255,
+        JsxSelfClosingElement = 256,
+        JsxOpeningElement = 257,
+        JsxClosingElement = 258,
+        JsxFragment = 259,
+        JsxOpeningFragment = 260,
+        JsxClosingFragment = 261,
+        JsxAttribute = 262,
+        JsxAttributes = 263,
+        JsxSpreadAttribute = 264,
+        JsxExpression = 265,
+        CaseClause = 266,
+        DefaultClause = 267,
+        HeritageClause = 268,
+        CatchClause = 269,
+        PropertyAssignment = 270,
+        ShorthandPropertyAssignment = 271,
+        SpreadAssignment = 272,
+        EnumMember = 273,
+        SourceFile = 274,
+        Bundle = 275,
+        UnparsedSource = 276,
+        InputFiles = 277,
+        JSDocTypeExpression = 278,
+        JSDocAllType = 279,
+        JSDocUnknownType = 280,
+        JSDocNullableType = 281,
+        JSDocNonNullableType = 282,
+        JSDocOptionalType = 283,
+        JSDocFunctionType = 284,
+        JSDocVariadicType = 285,
+        JSDocComment = 286,
+        JSDocTypeLiteral = 287,
+        JSDocSignature = 288,
+        JSDocTag = 289,
+        JSDocAugmentsTag = 290,
+        JSDocClassTag = 291,
+        JSDocCallbackTag = 292,
+        JSDocParameterTag = 293,
+        JSDocReturnTag = 294,
+        JSDocTypeTag = 295,
+        JSDocTemplateTag = 296,
+        JSDocTypedefTag = 297,
+        JSDocPropertyTag = 298,
+        SyntaxList = 299,
+        NotEmittedStatement = 300,
+        PartiallyEmittedExpression = 301,
+        CommaListExpression = 302,
+        MergeDeclarationMarker = 303,
+        EndOfDeclarationMarker = 304,
+        Count = 305,
+        FirstAssignment = 58,
+        LastAssignment = 70,
+        FirstCompoundAssignment = 59,
+        LastCompoundAssignment = 70,
+        FirstReservedWord = 72,
+        LastReservedWord = 107,
+        FirstKeyword = 72,
+        LastKeyword = 145,
+        FirstFutureReservedWord = 108,
+        LastFutureReservedWord = 116,
+        FirstTypeNode = 161,
+        LastTypeNode = 179,
+        FirstPunctuation = 17,
+        LastPunctuation = 70,
+        FirstToken = 0,
+        LastToken = 145,
+        FirstTriviaToken = 2,
+        LastTriviaToken = 7,
+        FirstLiteralToken = 8,
+        LastLiteralToken = 13,
+        FirstTemplateToken = 13,
+        LastTemplateToken = 16,
+        FirstBinaryOperator = 27,
+        LastBinaryOperator = 70,
+        FirstNode = 146,
+        FirstJSDocNode = 278,
+        LastJSDocNode = 298,
+        FirstJSDocTagNode = 289,
+        LastJSDocTagNode = 298,
+        FirstContextualKeyword = 117,
+        LastContextualKeyword = 145
+    }
+    enum NodeFlags {
+        None = 0,
+        Let = 1,
+        Const = 2,
+        NestedNamespace = 4,
+        Synthesized = 8,
+        Namespace = 16,
+        ExportContext = 32,
+        ContainsThis = 64,
+        HasImplicitReturn = 128,
+        HasExplicitReturn = 256,
+        GlobalAugmentation = 512,
+        HasAsyncFunctions = 1024,
+        DisallowInContext = 2048,
+        YieldContext = 4096,
+        DecoratorContext = 8192,
+        AwaitContext = 16384,
+        ThisNodeHasError = 32768,
+        JavaScriptFile = 65536,
+        ThisNodeOrAnySubNodesHasError = 131072,
+        HasAggregatedChildData = 262144,
+        PossiblyContainsDynamicImport = 524288,
+        PossiblyContainsImportMeta = 1048576,
+        JSDoc = 2097152,
+        Ambient = 4194304,
+        InWithStatement = 8388608,
+        JsonFile = 16777216,
+        BlockScoped = 3,
+        ReachabilityCheckFlags = 384,
+        ReachabilityAndEmitFlags = 1408,
+        ContextFlags = 12679168,
+        TypeExcludesFlags = 20480,
+        PermanentlySetIncrementalFlags = 1572864
+    }
+    enum ModifierFlags {
+        None = 0,
+        Export = 1,
+        Ambient = 2,
+        Public = 4,
+        Private = 8,
+        Protected = 16,
+        Static = 32,
+        Readonly = 64,
+        Abstract = 128,
+        Async = 256,
+        Default = 512,
+        Const = 2048,
+        HasComputedFlags = 536870912,
+        AccessibilityModifier = 28,
+        ParameterPropertyModifier = 92,
+        NonPublicAccessibilityModifier = 24,
+        TypeScriptModifier = 2270,
+        ExportDefault = 513,
+        All = 3071
+    }
+    enum JsxFlags {
+        None = 0,
+        /** An element from a named property of the JSX.IntrinsicElements interface */
+        IntrinsicNamedElement = 1,
+        /** An element inferred from the string index signature of the JSX.IntrinsicElements interface */
+        IntrinsicIndexedElement = 2,
+        IntrinsicElement = 3
+    }
+    enum RelationComparisonResult {
+        Succeeded = 1,
+        Failed = 2,
+        FailedAndReported = 3
+    }
+    interface Node extends TextRange {
+        kind: SyntaxKind;
+        flags: NodeFlags;
+        modifierFlagsCache?: ModifierFlags;
+        transformFlags: TransformFlags;
+        decorators?: NodeArray<Decorator>;
+        modifiers?: ModifiersArray;
+        id?: number;
+        parent: Node;
+        original?: Node;
+        symbol: Symbol;
+        locals?: SymbolTable;
+        nextContainer?: Node;
+        localSymbol?: Symbol;
+        flowNode?: FlowNode;
+        emitNode?: EmitNode;
+        contextualType?: Type;
+        contextualMapper?: TypeMapper;
+    }
+    interface JSDocContainer {
+        jsDoc?: JSDoc[];
+        jsDocCache?: ReadonlyArray<JSDocTag>;
+    }
+    type HasJSDoc = ParameterDeclaration | CallSignatureDeclaration | ConstructSignatureDeclaration | MethodSignature | PropertySignature | ArrowFunction | ParenthesizedExpression | SpreadAssignment | ShorthandPropertyAssignment | PropertyAssignment | FunctionExpression | LabeledStatement | ExpressionStatement | VariableStatement | FunctionDeclaration | ConstructorDeclaration | MethodDeclaration | PropertyDeclaration | AccessorDeclaration | ClassLikeDeclaration | InterfaceDeclaration | TypeAliasDeclaration | EnumMember | EnumDeclaration | ModuleDeclaration | ImportEqualsDeclaration | IndexSignatureDeclaration | FunctionTypeNode | ConstructorTypeNode | JSDocFunctionType | EndOfFileToken;
+    type HasType = SignatureDeclaration | VariableDeclaration | ParameterDeclaration | PropertySignature | PropertyDeclaration | TypePredicateNode | ParenthesizedTypeNode | TypeOperatorNode | MappedTypeNode | AssertionExpression | TypeAliasDeclaration | JSDocTypeExpression | JSDocNonNullableType | JSDocNullableType | JSDocOptionalType | JSDocVariadicType;
+    type HasInitializer = HasExpressionInitializer | ForStatement | ForInStatement | ForOfStatement | JsxAttribute;
+    type HasExpressionInitializer = VariableDeclaration | ParameterDeclaration | BindingElement | PropertySignature | PropertyDeclaration | PropertyAssignment | EnumMember;
+    type MutableNodeArray<T extends Node> = NodeArray<T> & T[];
+    interface NodeArray<T extends Node> extends ReadonlyArray<T>, TextRange {
+        hasTrailingComma?: boolean;
+        transformFlags: TransformFlags;
+    }
+    interface Token<TKind extends SyntaxKind> extends Node {
+        kind: TKind;
+    }
+    type DotDotDotToken = Token<SyntaxKind.DotDotDotToken>;
+    type QuestionToken = Token<SyntaxKind.QuestionToken>;
+    type ExclamationToken = Token<SyntaxKind.ExclamationToken>;
+    type ColonToken = Token<SyntaxKind.ColonToken>;
+    type EqualsToken = Token<SyntaxKind.EqualsToken>;
+    type AsteriskToken = Token<SyntaxKind.AsteriskToken>;
+    type EqualsGreaterThanToken = Token<SyntaxKind.EqualsGreaterThanToken>;
+    type EndOfFileToken = Token<SyntaxKind.EndOfFileToken> & JSDocContainer;
+    type AtToken = Token<SyntaxKind.AtToken>;
+    type ReadonlyToken = Token<SyntaxKind.ReadonlyKeyword>;
+    type AwaitKeywordToken = Token<SyntaxKind.AwaitKeyword>;
+    type PlusToken = Token<SyntaxKind.PlusToken>;
+    type MinusToken = Token<SyntaxKind.MinusToken>;
+    type Modifier = Token<SyntaxKind.AbstractKeyword> | Token<SyntaxKind.AsyncKeyword> | Token<SyntaxKind.ConstKeyword> | Token<SyntaxKind.DeclareKeyword> | Token<SyntaxKind.DefaultKeyword> | Token<SyntaxKind.ExportKeyword> | Token<SyntaxKind.PublicKeyword> | Token<SyntaxKind.PrivateKeyword> | Token<SyntaxKind.ProtectedKeyword> | Token<SyntaxKind.ReadonlyKeyword> | Token<SyntaxKind.StaticKeyword>;
+    type ModifiersArray = NodeArray<Modifier>;
+    enum GeneratedIdentifierFlags {
+        None = 0,
+        Auto = 1,
+        Loop = 2,
+        Unique = 3,
+        Node = 4,
+        KindMask = 7,
+        ReservedInNestedScopes = 8,
+        Optimistic = 16,
+        FileLevel = 32
+    }
+    interface Identifier extends PrimaryExpression, Declaration {
+        kind: SyntaxKind.Identifier;
+        /**
+         * Prefer to use `id.unescapedText`. (Note: This is available only in services, not internally to the TypeScript compiler.)
+         * Text of identifier, but if the identifier begins with two underscores, this will begin with three.
+         */
+        escapedText: __String;
+        originalKeywordKind?: SyntaxKind;
+        autoGenerateFlags?: GeneratedIdentifierFlags;
+        autoGenerateId?: number;
+        isInJSDocNamespace?: boolean;
+        typeArguments?: NodeArray<TypeNode | TypeParameterDeclaration>;
+        jsdocDotPos?: number;
+    }
+    interface TransientIdentifier extends Identifier {
+        resolvedSymbol: Symbol;
+    }
+    interface GeneratedIdentifier extends Identifier {
+        autoGenerateFlags: GeneratedIdentifierFlags;
+    }
+    interface QualifiedName extends Node {
+        kind: SyntaxKind.QualifiedName;
+        left: EntityName;
+        right: Identifier;
+        jsdocDotPos?: number;
+    }
+    type EntityName = Identifier | QualifiedName;
+    type PropertyName = Identifier | StringLiteral | NumericLiteral | ComputedPropertyName;
+    type DeclarationName = Identifier | StringLiteral | NumericLiteral | ComputedPropertyName | BindingPattern;
+    interface Declaration extends Node {
+        _declarationBrand: any;
+    }
+    interface NamedDeclaration extends Declaration {
+        name?: DeclarationName;
+    }
+    interface DynamicNamedDeclaration extends NamedDeclaration {
+        name: ComputedPropertyName;
+    }
+    interface LateBoundDeclaration extends DynamicNamedDeclaration {
+        name: LateBoundName;
+    }
+    interface DeclarationStatement extends NamedDeclaration, Statement {
+        name?: Identifier | StringLiteral | NumericLiteral;
+    }
+    interface ComputedPropertyName extends Node {
+        kind: SyntaxKind.ComputedPropertyName;
+        expression: Expression;
+    }
+    interface LateBoundName extends ComputedPropertyName {
+        expression: EntityNameExpression;
+    }
+    interface Decorator extends Node {
+        kind: SyntaxKind.Decorator;
+        parent: NamedDeclaration;
+        expression: LeftHandSideExpression;
+    }
+    interface TypeParameterDeclaration extends NamedDeclaration {
+        kind: SyntaxKind.TypeParameter;
+        parent: DeclarationWithTypeParameters | InferTypeNode;
+        name: Identifier;
+        constraint?: TypeNode;
+        default?: TypeNode;
+        expression?: Expression;
+    }
+    interface SignatureDeclarationBase extends NamedDeclaration, JSDocContainer {
+        kind: SignatureDeclaration["kind"];
+        name?: PropertyName;
+        typeParameters?: NodeArray<TypeParameterDeclaration>;
+        parameters: NodeArray<ParameterDeclaration>;
+        type?: TypeNode;
+        typeArguments?: NodeArray<TypeNode>;
+    }
+    type SignatureDeclaration = CallSignatureDeclaration | ConstructSignatureDeclaration | MethodSignature | IndexSignatureDeclaration | FunctionTypeNode | ConstructorTypeNode | JSDocFunctionType | FunctionDeclaration | MethodDeclaration | ConstructorDeclaration | AccessorDeclaration | FunctionExpression | ArrowFunction;
+    interface CallSignatureDeclaration extends SignatureDeclarationBase, TypeElement {
+        kind: SyntaxKind.CallSignature;
+    }
+    interface ConstructSignatureDeclaration extends SignatureDeclarationBase, TypeElement {
+        kind: SyntaxKind.ConstructSignature;
+    }
+    type BindingName = Identifier | BindingPattern;
+    interface VariableDeclaration extends NamedDeclaration {
+        kind: SyntaxKind.VariableDeclaration;
+        parent: VariableDeclarationList | CatchClause;
+        name: BindingName;
+        exclamationToken?: ExclamationToken;
+        type?: TypeNode;
+        initializer?: Expression;
+    }
+    interface VariableDeclarationList extends Node {
+        kind: SyntaxKind.VariableDeclarationList;
+        parent: VariableStatement | ForStatement | ForOfStatement | ForInStatement;
+        declarations: NodeArray<VariableDeclaration>;
+    }
+    interface ParameterDeclaration extends NamedDeclaration, JSDocContainer {
+        kind: SyntaxKind.Parameter;
+        parent: SignatureDeclaration;
+        dotDotDotToken?: DotDotDotToken;
+        name: BindingName;
+        questionToken?: QuestionToken;
+        type?: TypeNode;
+        initializer?: Expression;
+    }
+    interface BindingElement extends NamedDeclaration {
+        kind: SyntaxKind.BindingElement;
+        parent: BindingPattern;
+        propertyName?: PropertyName;
+        dotDotDotToken?: DotDotDotToken;
+        name: BindingName;
+        initializer?: Expression;
+    }
+    type BindingElementGrandparent = BindingElement["parent"]["parent"];
+    interface PropertySignature extends TypeElement, JSDocContainer {
+        kind: SyntaxKind.PropertySignature;
+        name: PropertyName;
+        questionToken?: QuestionToken;
+        type?: TypeNode;
+        initializer?: Expression;
+    }
+    interface PropertyDeclaration extends ClassElement, JSDocContainer {
+        kind: SyntaxKind.PropertyDeclaration;
+        parent: ClassLikeDeclaration;
+        name: PropertyName;
+        questionToken?: QuestionToken;
+        exclamationToken?: ExclamationToken;
+        type?: TypeNode;
+        initializer?: Expression;
+    }
+    interface ObjectLiteralElement extends NamedDeclaration {
+        _objectLiteralBrandBrand: any;
+        name?: PropertyName;
+    }
+    type ObjectLiteralElementLike = PropertyAssignment | ShorthandPropertyAssignment | SpreadAssignment | MethodDeclaration | AccessorDeclaration;
+    interface PropertyAssignment extends ObjectLiteralElement, JSDocContainer {
+        parent: ObjectLiteralExpression;
+        kind: SyntaxKind.PropertyAssignment;
+        name: PropertyName;
+        questionToken?: QuestionToken;
+        initializer: Expression;
+    }
+    interface ShorthandPropertyAssignment extends ObjectLiteralElement, JSDocContainer {
+        parent: ObjectLiteralExpression;
+        kind: SyntaxKind.ShorthandPropertyAssignment;
+        name: Identifier;
+        questionToken?: QuestionToken;
+        equalsToken?: Token<SyntaxKind.EqualsToken>;
+        objectAssignmentInitializer?: Expression;
+    }
+    interface SpreadAssignment extends ObjectLiteralElement, JSDocContainer {
+        parent: ObjectLiteralExpression;
+        kind: SyntaxKind.SpreadAssignment;
+        expression: Expression;
+    }
+    type VariableLikeDeclaration = VariableDeclaration | ParameterDeclaration | BindingElement | PropertyDeclaration | PropertyAssignment | PropertySignature | JsxAttribute | ShorthandPropertyAssignment | EnumMember | JSDocPropertyTag | JSDocParameterTag;
+    interface PropertyLikeDeclaration extends NamedDeclaration {
+        name: PropertyName;
+    }
+    interface ObjectBindingPattern extends Node {
+        kind: SyntaxKind.ObjectBindingPattern;
+        parent: VariableDeclaration | ParameterDeclaration | BindingElement;
+        elements: NodeArray<BindingElement>;
+    }
+    interface ArrayBindingPattern extends Node {
+        kind: SyntaxKind.ArrayBindingPattern;
+        parent: VariableDeclaration | ParameterDeclaration | BindingElement;
+        elements: NodeArray<ArrayBindingElement>;
+    }
+    type BindingPattern = ObjectBindingPattern | ArrayBindingPattern;
+    type ArrayBindingElement = BindingElement | OmittedExpression;
+    /**
+     * Several node kinds share function-like features such as a signature,
+     * a name, and a body. These nodes should extend FunctionLikeDeclarationBase.
+     * Examples:
+     * - FunctionDeclaration
+     * - MethodDeclaration
+     * - AccessorDeclaration
+     */
+    interface FunctionLikeDeclarationBase extends SignatureDeclarationBase {
+        _functionLikeDeclarationBrand: any;
+        asteriskToken?: AsteriskToken;
+        questionToken?: QuestionToken;
+        body?: Block | Expression;
+    }
+    type FunctionLikeDeclaration = FunctionDeclaration | MethodDeclaration | GetAccessorDeclaration | SetAccessorDeclaration | ConstructorDeclaration | FunctionExpression | ArrowFunction;
+    /** @deprecated Use SignatureDeclaration */
+    type FunctionLike = SignatureDeclaration;
+    interface FunctionDeclaration extends FunctionLikeDeclarationBase, DeclarationStatement {
+        kind: SyntaxKind.FunctionDeclaration;
+        name?: Identifier;
+        body?: FunctionBody;
+    }
+    interface MethodSignature extends SignatureDeclarationBase, TypeElement {
+        kind: SyntaxKind.MethodSignature;
+        parent: ObjectTypeDeclaration;
+        name: PropertyName;
+    }
+    interface MethodDeclaration extends FunctionLikeDeclarationBase, ClassElement, ObjectLiteralElement, JSDocContainer {
+        kind: SyntaxKind.MethodDeclaration;
+        parent: ClassLikeDeclaration | ObjectLiteralExpression;
+        name: PropertyName;
+        body?: FunctionBody;
+    }
+    interface ConstructorDeclaration extends FunctionLikeDeclarationBase, ClassElement, JSDocContainer {
+        kind: SyntaxKind.Constructor;
+        parent: ClassLikeDeclaration;
+        body?: FunctionBody;
+        returnFlowNode?: FlowNode;
+    }
+    /** For when we encounter a semicolon in a class declaration. ES6 allows these as class elements. */
+    interface SemicolonClassElement extends ClassElement {
+        kind: SyntaxKind.SemicolonClassElement;
+        parent: ClassLikeDeclaration;
+    }
+    interface GetAccessorDeclaration extends FunctionLikeDeclarationBase, ClassElement, ObjectLiteralElement, JSDocContainer {
+        kind: SyntaxKind.GetAccessor;
+        parent: ClassLikeDeclaration | ObjectLiteralExpression;
+        name: PropertyName;
+        body?: FunctionBody;
+    }
+    interface SetAccessorDeclaration extends FunctionLikeDeclarationBase, ClassElement, ObjectLiteralElement, JSDocContainer {
+        kind: SyntaxKind.SetAccessor;
+        parent: ClassLikeDeclaration | ObjectLiteralExpression;
+        name: PropertyName;
+        body?: FunctionBody;
+    }
+    type AccessorDeclaration = GetAccessorDeclaration | SetAccessorDeclaration;
+    interface IndexSignatureDeclaration extends SignatureDeclarationBase, ClassElement, TypeElement {
+        kind: SyntaxKind.IndexSignature;
+        parent: ObjectTypeDeclaration;
+    }
+    interface TypeNode extends Node {
+        _typeNodeBrand: any;
+    }
+    interface KeywordTypeNode extends TypeNode {
+        kind: SyntaxKind.AnyKeyword | SyntaxKind.UnknownKeyword | SyntaxKind.NumberKeyword | SyntaxKind.ObjectKeyword | SyntaxKind.BooleanKeyword | SyntaxKind.StringKeyword | SyntaxKind.SymbolKeyword | SyntaxKind.ThisKeyword | SyntaxKind.VoidKeyword | SyntaxKind.UndefinedKeyword | SyntaxKind.NullKeyword | SyntaxKind.NeverKeyword;
+    }
+    interface ImportTypeNode extends NodeWithTypeArguments {
+        kind: SyntaxKind.ImportType;
+        isTypeOf?: boolean;
+        argument: TypeNode;
+        qualifier?: EntityName;
+    }
+    type LiteralImportTypeNode = ImportTypeNode & {
+        argument: LiteralTypeNode & {
+            literal: StringLiteral;
+        };
+    };
+    interface ThisTypeNode extends TypeNode {
+        kind: SyntaxKind.ThisType;
+    }
+    type FunctionOrConstructorTypeNode = FunctionTypeNode | ConstructorTypeNode;
+    interface FunctionOrConstructorTypeNodeBase extends TypeNode, SignatureDeclarationBase {
+        kind: SyntaxKind.FunctionType | SyntaxKind.ConstructorType;
+        type: TypeNode;
+    }
+    interface FunctionTypeNode extends FunctionOrConstructorTypeNodeBase {
+        kind: SyntaxKind.FunctionType;
+    }
+    interface ConstructorTypeNode extends FunctionOrConstructorTypeNodeBase {
+        kind: SyntaxKind.ConstructorType;
+    }
+    interface NodeWithTypeArguments extends TypeNode {
+        typeArguments?: NodeArray<TypeNode>;
+    }
+    type TypeReferenceType = TypeReferenceNode | ExpressionWithTypeArguments;
+    interface TypeReferenceNode extends NodeWithTypeArguments {
+        kind: SyntaxKind.TypeReference;
+        typeName: EntityName;
+    }
+    interface TypePredicateNode extends TypeNode {
+        kind: SyntaxKind.TypePredicate;
+        parent: SignatureDeclaration;
+        parameterName: Identifier | ThisTypeNode;
+        type: TypeNode;
+    }
+    interface TypeQueryNode extends TypeNode {
+        kind: SyntaxKind.TypeQuery;
+        exprName: EntityName;
+    }
+    interface TypeLiteralNode extends TypeNode, Declaration {
+        kind: SyntaxKind.TypeLiteral;
+        members: NodeArray<TypeElement>;
+    }
+    interface ArrayTypeNode extends TypeNode {
+        kind: SyntaxKind.ArrayType;
+        elementType: TypeNode;
+    }
+    interface TupleTypeNode extends TypeNode {
+        kind: SyntaxKind.TupleType;
+        elementTypes: NodeArray<TypeNode>;
+    }
+    type UnionOrIntersectionTypeNode = UnionTypeNode | IntersectionTypeNode;
+    interface UnionTypeNode extends TypeNode {
+        kind: SyntaxKind.UnionType;
+        types: NodeArray<TypeNode>;
+    }
+    interface IntersectionTypeNode extends TypeNode {
+        kind: SyntaxKind.IntersectionType;
+        types: NodeArray<TypeNode>;
+    }
+    interface ConditionalTypeNode extends TypeNode {
+        kind: SyntaxKind.ConditionalType;
+        checkType: TypeNode;
+        extendsType: TypeNode;
+        trueType: TypeNode;
+        falseType: TypeNode;
+    }
+    interface InferTypeNode extends TypeNode {
+        kind: SyntaxKind.InferType;
+        typeParameter: TypeParameterDeclaration;
+    }
+    interface ParenthesizedTypeNode extends TypeNode {
+        kind: SyntaxKind.ParenthesizedType;
+        type: TypeNode;
+    }
+    interface TypeOperatorNode extends TypeNode {
+        kind: SyntaxKind.TypeOperator;
+        operator: SyntaxKind.KeyOfKeyword | SyntaxKind.UniqueKeyword;
+        type: TypeNode;
+    }
+    interface UniqueTypeOperatorNode extends TypeOperatorNode {
+        operator: SyntaxKind.UniqueKeyword;
+    }
+    interface IndexedAccessTypeNode extends TypeNode {
+        kind: SyntaxKind.IndexedAccessType;
+        objectType: TypeNode;
+        indexType: TypeNode;
+    }
+    interface MappedTypeNode extends TypeNode, Declaration {
+        kind: SyntaxKind.MappedType;
+        readonlyToken?: ReadonlyToken | PlusToken | MinusToken;
+        typeParameter: TypeParameterDeclaration;
+        questionToken?: QuestionToken | PlusToken | MinusToken;
+        type?: TypeNode;
+    }
+    interface LiteralTypeNode extends TypeNode {
+        kind: SyntaxKind.LiteralType;
+        literal: BooleanLiteral | LiteralExpression | PrefixUnaryExpression;
+    }
+    interface StringLiteral extends LiteralExpression {
+        kind: SyntaxKind.StringLiteral;
+        textSourceNode?: Identifier | StringLiteralLike | NumericLiteral;
+        /** Note: this is only set when synthesizing a node, not during parsing. */
+        singleQuote?: boolean;
+    }
+    type StringLiteralLike = StringLiteral | NoSubstitutionTemplateLiteral;
+    interface Expression extends Node {
+        _expressionBrand: any;
+    }
+    interface OmittedExpression extends Expression {
+        kind: SyntaxKind.OmittedExpression;
+    }
+    interface PartiallyEmittedExpression extends LeftHandSideExpression {
+        kind: SyntaxKind.PartiallyEmittedExpression;
+        expression: Expression;
+    }
+    interface UnaryExpression extends Expression {
+        _unaryExpressionBrand: any;
+    }
+    /** Deprecated, please use UpdateExpression */
+    type IncrementExpression = UpdateExpression;
+    interface UpdateExpression extends UnaryExpression {
+        _updateExpressionBrand: any;
+    }
+    type PrefixUnaryOperator = SyntaxKind.PlusPlusToken | SyntaxKind.MinusMinusToken | SyntaxKind.PlusToken | SyntaxKind.MinusToken | SyntaxKind.TildeToken | SyntaxKind.ExclamationToken;
+    interface PrefixUnaryExpression extends UpdateExpression {
+        kind: SyntaxKind.PrefixUnaryExpression;
+        operator: PrefixUnaryOperator;
+        operand: UnaryExpression;
+    }
+    type PostfixUnaryOperator = SyntaxKind.PlusPlusToken | SyntaxKind.MinusMinusToken;
+    interface PostfixUnaryExpression extends UpdateExpression {
+        kind: SyntaxKind.PostfixUnaryExpression;
+        operand: LeftHandSideExpression;
+        operator: PostfixUnaryOperator;
+    }
+    interface LeftHandSideExpression extends UpdateExpression {
+        _leftHandSideExpressionBrand: any;
+    }
+    interface MemberExpression extends LeftHandSideExpression {
+        _memberExpressionBrand: any;
+    }
+    interface PrimaryExpression extends MemberExpression {
+        _primaryExpressionBrand: any;
+    }
+    interface NullLiteral extends PrimaryExpression, TypeNode {
+        kind: SyntaxKind.NullKeyword;
+    }
+    interface BooleanLiteral extends PrimaryExpression, TypeNode {
+        kind: SyntaxKind.TrueKeyword | SyntaxKind.FalseKeyword;
+    }
+    interface ThisExpression extends PrimaryExpression, KeywordTypeNode {
+        kind: SyntaxKind.ThisKeyword;
+    }
+    interface SuperExpression extends PrimaryExpression {
+        kind: SyntaxKind.SuperKeyword;
+    }
+    interface ImportExpression extends PrimaryExpression {
+        kind: SyntaxKind.ImportKeyword;
+    }
+    interface DeleteExpression extends UnaryExpression {
+        kind: SyntaxKind.DeleteExpression;
+        expression: UnaryExpression;
+    }
+    interface TypeOfExpression extends UnaryExpression {
+        kind: SyntaxKind.TypeOfExpression;
+        expression: UnaryExpression;
+    }
+    interface VoidExpression extends UnaryExpression {
+        kind: SyntaxKind.VoidExpression;
+        expression: UnaryExpression;
+    }
+    interface AwaitExpression extends UnaryExpression {
+        kind: SyntaxKind.AwaitExpression;
+        expression: UnaryExpression;
+    }
+    interface YieldExpression extends Expression {
+        kind: SyntaxKind.YieldExpression;
+        asteriskToken?: AsteriskToken;
+        expression?: Expression;
+    }
+    type ExponentiationOperator = SyntaxKind.AsteriskAsteriskToken;
+    type MultiplicativeOperator = SyntaxKind.AsteriskToken | SyntaxKind.SlashToken | SyntaxKind.PercentToken;
+    type MultiplicativeOperatorOrHigher = ExponentiationOperator | MultiplicativeOperator;
+    type AdditiveOperator = SyntaxKind.PlusToken | SyntaxKind.MinusToken;
+    type AdditiveOperatorOrHigher = MultiplicativeOperatorOrHigher | AdditiveOperator;
+    type ShiftOperator = SyntaxKind.LessThanLessThanToken | SyntaxKind.GreaterThanGreaterThanToken | SyntaxKind.GreaterThanGreaterThanGreaterThanToken;
+    type ShiftOperatorOrHigher = AdditiveOperatorOrHigher | ShiftOperator;
+    type RelationalOperator = SyntaxKind.LessThanToken | SyntaxKind.LessThanEqualsToken | SyntaxKind.GreaterThanToken | SyntaxKind.GreaterThanEqualsToken | SyntaxKind.InstanceOfKeyword | SyntaxKind.InKeyword;
+    type RelationalOperatorOrHigher = ShiftOperatorOrHigher | RelationalOperator;
+    type EqualityOperator = SyntaxKind.EqualsEqualsToken | SyntaxKind.EqualsEqualsEqualsToken | SyntaxKind.ExclamationEqualsEqualsToken | SyntaxKind.ExclamationEqualsToken;
+    type EqualityOperatorOrHigher = RelationalOperatorOrHigher | EqualityOperator;
+    type BitwiseOperator = SyntaxKind.AmpersandToken | SyntaxKind.BarToken | SyntaxKind.CaretToken;
+    type BitwiseOperatorOrHigher = EqualityOperatorOrHigher | BitwiseOperator;
+    type LogicalOperator = SyntaxKind.AmpersandAmpersandToken | SyntaxKind.BarBarToken;
+    type LogicalOperatorOrHigher = BitwiseOperatorOrHigher | LogicalOperator;
+    type CompoundAssignmentOperator = SyntaxKind.PlusEqualsToken | SyntaxKind.MinusEqualsToken | SyntaxKind.AsteriskAsteriskEqualsToken | SyntaxKind.AsteriskEqualsToken | SyntaxKind.SlashEqualsToken | SyntaxKind.PercentEqualsToken | SyntaxKind.AmpersandEqualsToken | SyntaxKind.BarEqualsToken | SyntaxKind.CaretEqualsToken | SyntaxKind.LessThanLessThanEqualsToken | SyntaxKind.GreaterThanGreaterThanGreaterThanEqualsToken | SyntaxKind.GreaterThanGreaterThanEqualsToken;
+    type AssignmentOperator = SyntaxKind.EqualsToken | CompoundAssignmentOperator;
+    type AssignmentOperatorOrHigher = LogicalOperatorOrHigher | AssignmentOperator;
+    type BinaryOperator = AssignmentOperatorOrHigher | SyntaxKind.CommaToken;
+    type BinaryOperatorToken = Token<BinaryOperator>;
+    interface BinaryExpression extends Expression, Declaration {
+        kind: SyntaxKind.BinaryExpression;
+        left: Expression;
+        operatorToken: BinaryOperatorToken;
+        right: Expression;
+    }
+    type AssignmentOperatorToken = Token<AssignmentOperator>;
+    interface AssignmentExpression<TOperator extends AssignmentOperatorToken> extends BinaryExpression {
+        left: LeftHandSideExpression;
+        operatorToken: TOperator;
+    }
+    interface ObjectDestructuringAssignment extends AssignmentExpression<EqualsToken> {
+        left: ObjectLiteralExpression;
+    }
+    interface ArrayDestructuringAssignment extends AssignmentExpression<EqualsToken> {
+        left: ArrayLiteralExpression;
+    }
+    type DestructuringAssignment = ObjectDestructuringAssignment | ArrayDestructuringAssignment;
+    type BindingOrAssignmentElement = VariableDeclaration | ParameterDeclaration | BindingElement | PropertyAssignment | ShorthandPropertyAssignment | SpreadAssignment | OmittedExpression | SpreadElement | ArrayLiteralExpression | ObjectLiteralExpression | AssignmentExpression<EqualsToken> | Identifier | PropertyAccessExpression | ElementAccessExpression;
+    type BindingOrAssignmentElementRestIndicator = DotDotDotToken | SpreadElement | SpreadAssignment;
+    type BindingOrAssignmentElementTarget = BindingOrAssignmentPattern | Identifier | PropertyAccessExpression | ElementAccessExpression | OmittedExpression;
+    type ObjectBindingOrAssignmentPattern = ObjectBindingPattern | ObjectLiteralExpression;
+    type ArrayBindingOrAssignmentPattern = ArrayBindingPattern | ArrayLiteralExpression;
+    type AssignmentPattern = ObjectLiteralExpression | ArrayLiteralExpression;
+    type BindingOrAssignmentPattern = ObjectBindingOrAssignmentPattern | ArrayBindingOrAssignmentPattern;
+    interface ConditionalExpression extends Expression {
+        kind: SyntaxKind.ConditionalExpression;
+        condition: Expression;
+        questionToken: QuestionToken;
+        whenTrue: Expression;
+        colonToken: ColonToken;
+        whenFalse: Expression;
+    }
+    type FunctionBody = Block;
+    type ConciseBody = FunctionBody | Expression;
+    interface FunctionExpression extends PrimaryExpression, FunctionLikeDeclarationBase, JSDocContainer {
+        kind: SyntaxKind.FunctionExpression;
+        name?: Identifier;
+        body: FunctionBody;
+    }
+    interface ArrowFunction extends Expression, FunctionLikeDeclarationBase, JSDocContainer {
+        kind: SyntaxKind.ArrowFunction;
+        equalsGreaterThanToken: EqualsGreaterThanToken;
+        body: ConciseBody;
+        name: never;
+    }
+    interface LiteralLikeNode extends Node {
+        text: string;
+        isUnterminated?: boolean;
+        hasExtendedUnicodeEscape?: boolean;
+    }
+    interface LiteralExpression extends LiteralLikeNode, PrimaryExpression {
+        _literalExpressionBrand: any;
+    }
+    interface RegularExpressionLiteral extends LiteralExpression {
+        kind: SyntaxKind.RegularExpressionLiteral;
+    }
+    interface NoSubstitutionTemplateLiteral extends LiteralExpression {
+        kind: SyntaxKind.NoSubstitutionTemplateLiteral;
+    }
+    enum TokenFlags {
+        None = 0,
+        PrecedingLineBreak = 1,
+        PrecedingJSDocComment = 2,
+        Unterminated = 4,
+        ExtendedUnicodeEscape = 8,
+        Scientific = 16,
+        Octal = 32,
+        HexSpecifier = 64,
+        BinarySpecifier = 128,
+        OctalSpecifier = 256,
+        ContainsSeparator = 512,
+        BinaryOrOctalSpecifier = 384,
+        NumericLiteralFlags = 1008
+    }
+    interface NumericLiteral extends LiteralExpression {
+        kind: SyntaxKind.NumericLiteral;
+        numericLiteralFlags: TokenFlags;
+    }
+    interface TemplateHead extends LiteralLikeNode {
+        kind: SyntaxKind.TemplateHead;
+        parent: TemplateExpression;
+    }
+    interface TemplateMiddle extends LiteralLikeNode {
+        kind: SyntaxKind.TemplateMiddle;
+        parent: TemplateSpan;
+    }
+    interface TemplateTail extends LiteralLikeNode {
+        kind: SyntaxKind.TemplateTail;
+        parent: TemplateSpan;
+    }
+    type TemplateLiteral = TemplateExpression | NoSubstitutionTemplateLiteral;
+    interface TemplateExpression extends PrimaryExpression {
+        kind: SyntaxKind.TemplateExpression;
+        head: TemplateHead;
+        templateSpans: NodeArray<TemplateSpan>;
+    }
+    interface TemplateSpan extends Node {
+        kind: SyntaxKind.TemplateSpan;
+        parent: TemplateExpression;
+        expression: Expression;
+        literal: TemplateMiddle | TemplateTail;
+    }
+    interface ParenthesizedExpression extends PrimaryExpression, JSDocContainer {
+        kind: SyntaxKind.ParenthesizedExpression;
+        expression: Expression;
+    }
+    interface ArrayLiteralExpression extends PrimaryExpression {
+        kind: SyntaxKind.ArrayLiteralExpression;
+        elements: NodeArray<Expression>;
+        multiLine?: boolean;
+    }
+    interface SpreadElement extends Expression {
+        kind: SyntaxKind.SpreadElement;
+        parent: ArrayLiteralExpression | CallExpression | NewExpression;
+        expression: Expression;
+    }
+    /**
+     * This interface is a base interface for ObjectLiteralExpression and JSXAttributes to extend from. JSXAttributes is similar to
+     * ObjectLiteralExpression in that it contains array of properties; however, JSXAttributes' properties can only be
+     * JSXAttribute or JSXSpreadAttribute. ObjectLiteralExpression, on the other hand, can only have properties of type
+     * ObjectLiteralElement (e.g. PropertyAssignment, ShorthandPropertyAssignment etc.)
+     */
+    interface ObjectLiteralExpressionBase<T extends ObjectLiteralElement> extends PrimaryExpression, Declaration {
+        properties: NodeArray<T>;
+    }
+    interface ObjectLiteralExpression extends ObjectLiteralExpressionBase<ObjectLiteralElementLike> {
+        kind: SyntaxKind.ObjectLiteralExpression;
+        multiLine?: boolean;
+    }
+    type EntityNameExpression = Identifier | PropertyAccessEntityNameExpression;
+    type EntityNameOrEntityNameExpression = EntityName | EntityNameExpression;
+    interface PropertyAccessExpression extends MemberExpression, NamedDeclaration {
+        kind: SyntaxKind.PropertyAccessExpression;
+        expression: LeftHandSideExpression;
+        name: Identifier;
+    }
+    interface SuperPropertyAccessExpression extends PropertyAccessExpression {
+        expression: SuperExpression;
+    }
+    /** Brand for a PropertyAccessExpression which, like a QualifiedName, consists of a sequence of identifiers separated by dots. */
+    interface PropertyAccessEntityNameExpression extends PropertyAccessExpression {
+        _propertyAccessExpressionLikeQualifiedNameBrand?: any;
+        expression: EntityNameExpression;
+    }
+    interface ElementAccessExpression extends MemberExpression {
+        kind: SyntaxKind.ElementAccessExpression;
+        expression: LeftHandSideExpression;
+        argumentExpression: Expression;
+    }
+    interface SuperElementAccessExpression extends ElementAccessExpression {
+        expression: SuperExpression;
+    }
+    type SuperProperty = SuperPropertyAccessExpression | SuperElementAccessExpression;
+    interface CallExpression extends LeftHandSideExpression, Declaration {
+        kind: SyntaxKind.CallExpression;
+        expression: LeftHandSideExpression;
+        typeArguments?: NodeArray<TypeNode>;
+        arguments: NodeArray<Expression>;
+    }
+    interface SuperCall extends CallExpression {
+        expression: SuperExpression;
+    }
+    interface ImportCall extends CallExpression {
+        expression: ImportExpression;
+    }
+    interface ExpressionWithTypeArguments extends NodeWithTypeArguments {
+        kind: SyntaxKind.ExpressionWithTypeArguments;
+        parent: HeritageClause;
+        expression: LeftHandSideExpression;
+    }
+    interface NewExpression extends PrimaryExpression, Declaration {
+        kind: SyntaxKind.NewExpression;
+        expression: LeftHandSideExpression;
+        typeArguments?: NodeArray<TypeNode>;
+        arguments?: NodeArray<Expression>;
+    }
+    interface TaggedTemplateExpression extends MemberExpression {
+        kind: SyntaxKind.TaggedTemplateExpression;
+        tag: LeftHandSideExpression;
+        typeArguments?: NodeArray<TypeNode>;
+        template: TemplateLiteral;
+    }
+    type CallLikeExpression = CallExpression | NewExpression | TaggedTemplateExpression | Decorator | JsxOpeningLikeElement;
+    interface AsExpression extends Expression {
+        kind: SyntaxKind.AsExpression;
+        expression: Expression;
+        type: TypeNode;
+    }
+    interface TypeAssertion extends UnaryExpression {
+        kind: SyntaxKind.TypeAssertionExpression;
+        type: TypeNode;
+        expression: UnaryExpression;
+    }
+    type AssertionExpression = TypeAssertion | AsExpression;
+    interface NonNullExpression extends LeftHandSideExpression {
+        kind: SyntaxKind.NonNullExpression;
+        expression: Expression;
+    }
+    interface MetaProperty extends PrimaryExpression {
+        kind: SyntaxKind.MetaProperty;
+        keywordToken: SyntaxKind.NewKeyword | SyntaxKind.ImportKeyword;
+        name: Identifier;
+    }
+    interface JsxElement extends PrimaryExpression {
+        kind: SyntaxKind.JsxElement;
+        openingElement: JsxOpeningElement;
+        children: NodeArray<JsxChild>;
+        closingElement: JsxClosingElement;
+    }
+    type JsxOpeningLikeElement = JsxSelfClosingElement | JsxOpeningElement;
+    type JsxAttributeLike = JsxAttribute | JsxSpreadAttribute;
+    type JsxTagNameExpression = PrimaryExpression | PropertyAccessExpression;
+    interface JsxAttributes extends ObjectLiteralExpressionBase<JsxAttributeLike> {
+        parent: JsxOpeningLikeElement;
+    }
+    interface JsxOpeningElement extends Expression {
+        kind: SyntaxKind.JsxOpeningElement;
+        parent: JsxElement;
+        tagName: JsxTagNameExpression;
+        typeArguments?: NodeArray<TypeNode>;
+        attributes: JsxAttributes;
+    }
+    interface JsxSelfClosingElement extends PrimaryExpression {
+        kind: SyntaxKind.JsxSelfClosingElement;
+        tagName: JsxTagNameExpression;
+        typeArguments?: NodeArray<TypeNode>;
+        attributes: JsxAttributes;
+    }
+    interface JsxFragment extends PrimaryExpression {
+        kind: SyntaxKind.JsxFragment;
+        openingFragment: JsxOpeningFragment;
+        children: NodeArray<JsxChild>;
+        closingFragment: JsxClosingFragment;
+    }
+    interface JsxOpeningFragment extends Expression {
+        kind: SyntaxKind.JsxOpeningFragment;
+        parent: JsxFragment;
+    }
+    interface JsxClosingFragment extends Expression {
+        kind: SyntaxKind.JsxClosingFragment;
+        parent: JsxFragment;
+    }
+    interface JsxAttribute extends ObjectLiteralElement {
+        kind: SyntaxKind.JsxAttribute;
+        parent: JsxAttributes;
+        name: Identifier;
+        initializer?: StringLiteral | JsxExpression;
+    }
+    interface JsxSpreadAttribute extends ObjectLiteralElement {
+        kind: SyntaxKind.JsxSpreadAttribute;
+        parent: JsxAttributes;
+        expression: Expression;
+    }
+    interface JsxClosingElement extends Node {
+        kind: SyntaxKind.JsxClosingElement;
+        parent: JsxElement;
+        tagName: JsxTagNameExpression;
+    }
+    interface JsxExpression extends Expression {
+        kind: SyntaxKind.JsxExpression;
+        parent: JsxElement | JsxAttributeLike;
+        dotDotDotToken?: Token<SyntaxKind.DotDotDotToken>;
+        expression?: Expression;
+    }
+    interface JsxText extends Node {
+        kind: SyntaxKind.JsxText;
+        containsOnlyWhiteSpaces: boolean;
+        parent: JsxElement;
+    }
+    type JsxChild = JsxText | JsxExpression | JsxElement | JsxSelfClosingElement | JsxFragment;
+    interface Statement extends Node {
+        _statementBrand: any;
+    }
+    interface NotEmittedStatement extends Statement {
+        kind: SyntaxKind.NotEmittedStatement;
+    }
+    /**
+     * Marks the end of transformed declaration to properly emit exports.
+     */
+    interface EndOfDeclarationMarker extends Statement {
+        kind: SyntaxKind.EndOfDeclarationMarker;
+    }
+    /**
+     * A list of comma-separated expressions. This node is only created by transformations.
+     */
+    interface CommaListExpression extends Expression {
+        kind: SyntaxKind.CommaListExpression;
+        elements: NodeArray<Expression>;
+    }
+    /**
+     * Marks the beginning of a merged transformed declaration.
+     */
+    interface MergeDeclarationMarker extends Statement {
+        kind: SyntaxKind.MergeDeclarationMarker;
+    }
+    interface EmptyStatement extends Statement {
+        kind: SyntaxKind.EmptyStatement;
+    }
+    interface DebuggerStatement extends Statement {
+        kind: SyntaxKind.DebuggerStatement;
+    }
+    interface MissingDeclaration extends DeclarationStatement {
+        kind: SyntaxKind.MissingDeclaration;
+        name?: Identifier;
+    }
+    type BlockLike = SourceFile | Block | ModuleBlock | CaseOrDefaultClause;
+    interface Block extends Statement {
+        kind: SyntaxKind.Block;
+        statements: NodeArray<Statement>;
+        multiLine?: boolean;
+    }
+    interface VariableStatement extends Statement, JSDocContainer {
+        kind: SyntaxKind.VariableStatement;
+        declarationList: VariableDeclarationList;
+    }
+    interface ExpressionStatement extends Statement, JSDocContainer {
+        kind: SyntaxKind.ExpressionStatement;
+        expression: Expression;
+    }
+    interface PrologueDirective extends ExpressionStatement {
+        expression: StringLiteral;
+    }
+    interface IfStatement extends Statement {
+        kind: SyntaxKind.IfStatement;
+        expression: Expression;
+        thenStatement: Statement;
+        elseStatement?: Statement;
+    }
+    interface IterationStatement extends Statement {
+        statement: Statement;
+    }
+    interface DoStatement extends IterationStatement {
+        kind: SyntaxKind.DoStatement;
+        expression: Expression;
+    }
+    interface WhileStatement extends IterationStatement {
+        kind: SyntaxKind.WhileStatement;
+        expression: Expression;
+    }
+    type ForInitializer = VariableDeclarationList | Expression;
+    interface ForStatement extends IterationStatement {
+        kind: SyntaxKind.ForStatement;
+        initializer?: ForInitializer;
+        condition?: Expression;
+        incrementor?: Expression;
+    }
+    type ForInOrOfStatement = ForInStatement | ForOfStatement;
+    interface ForInStatement extends IterationStatement {
+        kind: SyntaxKind.ForInStatement;
+        initializer: ForInitializer;
+        expression: Expression;
+    }
+    interface ForOfStatement extends IterationStatement {
+        kind: SyntaxKind.ForOfStatement;
+        awaitModifier?: AwaitKeywordToken;
+        initializer: ForInitializer;
+        expression: Expression;
+    }
+    interface BreakStatement extends Statement {
+        kind: SyntaxKind.BreakStatement;
+        label?: Identifier;
+    }
+    interface ContinueStatement extends Statement {
+        kind: SyntaxKind.ContinueStatement;
+        label?: Identifier;
+    }
+    type BreakOrContinueStatement = BreakStatement | ContinueStatement;
+    interface ReturnStatement extends Statement {
+        kind: SyntaxKind.ReturnStatement;
+        expression?: Expression;
+    }
+    interface WithStatement extends Statement {
+        kind: SyntaxKind.WithStatement;
+        expression: Expression;
+        statement: Statement;
+    }
+    interface SwitchStatement extends Statement {
+        kind: SyntaxKind.SwitchStatement;
+        expression: Expression;
+        caseBlock: CaseBlock;
+        possiblyExhaustive?: boolean;
+    }
+    interface CaseBlock extends Node {
+        kind: SyntaxKind.CaseBlock;
+        parent: SwitchStatement;
+        clauses: NodeArray<CaseOrDefaultClause>;
+    }
+    interface CaseClause extends Node {
+        kind: SyntaxKind.CaseClause;
+        parent: CaseBlock;
+        expression: Expression;
+        statements: NodeArray<Statement>;
+    }
+    interface DefaultClause extends Node {
+        kind: SyntaxKind.DefaultClause;
+        parent: CaseBlock;
+        statements: NodeArray<Statement>;
+    }
+    type CaseOrDefaultClause = CaseClause | DefaultClause;
+    interface LabeledStatement extends Statement, JSDocContainer {
+        kind: SyntaxKind.LabeledStatement;
+        label: Identifier;
+        statement: Statement;
+    }
+    interface ThrowStatement extends Statement {
+        kind: SyntaxKind.ThrowStatement;
+        expression?: Expression;
+    }
+    interface TryStatement extends Statement {
+        kind: SyntaxKind.TryStatement;
+        tryBlock: Block;
+        catchClause?: CatchClause;
+        finallyBlock?: Block;
+    }
+    interface CatchClause extends Node {
+        kind: SyntaxKind.CatchClause;
+        parent: TryStatement;
+        variableDeclaration?: VariableDeclaration;
+        block: Block;
+    }
+    type ObjectTypeDeclaration = ClassLikeDeclaration | InterfaceDeclaration | TypeLiteralNode;
+    type DeclarationWithTypeParameters = SignatureDeclaration | ClassLikeDeclaration | InterfaceDeclaration | TypeAliasDeclaration | JSDocTemplateTag | JSDocTypedefTag | JSDocCallbackTag | JSDocSignature;
+    interface ClassLikeDeclarationBase extends NamedDeclaration, JSDocContainer {
+        kind: SyntaxKind.ClassDeclaration | SyntaxKind.ClassExpression;
+        name?: Identifier;
+        typeParameters?: NodeArray<TypeParameterDeclaration>;
+        heritageClauses?: NodeArray<HeritageClause>;
+        members: NodeArray<ClassElement>;
+    }
+    interface ClassDeclaration extends ClassLikeDeclarationBase, DeclarationStatement {
+        kind: SyntaxKind.ClassDeclaration;
+        /** May be undefined in `export default class { ... }`. */
+        name?: Identifier;
+    }
+    interface ClassExpression extends ClassLikeDeclarationBase, PrimaryExpression {
+        kind: SyntaxKind.ClassExpression;
+    }
+    type ClassLikeDeclaration = ClassDeclaration | ClassExpression;
+    interface ClassElement extends NamedDeclaration {
+        _classElementBrand: any;
+        name?: PropertyName;
+    }
+    interface TypeElement extends NamedDeclaration {
+        _typeElementBrand: any;
+        name?: PropertyName;
+        questionToken?: QuestionToken;
+    }
+    interface InterfaceDeclaration extends DeclarationStatement, JSDocContainer {
+        kind: SyntaxKind.InterfaceDeclaration;
+        name: Identifier;
+        typeParameters?: NodeArray<TypeParameterDeclaration>;
+        heritageClauses?: NodeArray<HeritageClause>;
+        members: NodeArray<TypeElement>;
+    }
+    interface HeritageClause extends Node {
+        kind: SyntaxKind.HeritageClause;
+        parent: InterfaceDeclaration | ClassLikeDeclaration;
+        token: SyntaxKind.ExtendsKeyword | SyntaxKind.ImplementsKeyword;
+        types: NodeArray<ExpressionWithTypeArguments>;
+    }
+    interface TypeAliasDeclaration extends DeclarationStatement, JSDocContainer {
+        kind: SyntaxKind.TypeAliasDeclaration;
+        name: Identifier;
+        typeParameters?: NodeArray<TypeParameterDeclaration>;
+        type: TypeNode;
+    }
+    interface EnumMember extends NamedDeclaration, JSDocContainer {
+        kind: SyntaxKind.EnumMember;
+        parent: EnumDeclaration;
+        name: PropertyName;
+        initializer?: Expression;
+    }
+    interface EnumDeclaration extends DeclarationStatement, JSDocContainer {
+        kind: SyntaxKind.EnumDeclaration;
+        name: Identifier;
+        members: NodeArray<EnumMember>;
+    }
+    type ModuleName = Identifier | StringLiteral;
+    type ModuleBody = NamespaceBody | JSDocNamespaceBody;
+    interface AmbientModuleDeclaration extends ModuleDeclaration {
+        body?: ModuleBlock;
+    }
+    interface ModuleDeclaration extends DeclarationStatement, JSDocContainer {
+        kind: SyntaxKind.ModuleDeclaration;
+        parent: ModuleBody | SourceFile;
+        name: ModuleName;
+        body?: ModuleBody | JSDocNamespaceDeclaration;
+    }
+    type NamespaceBody = ModuleBlock | NamespaceDeclaration;
+    interface NamespaceDeclaration extends ModuleDeclaration {
+        name: Identifier;
+        body: NamespaceBody;
+    }
+    type JSDocNamespaceBody = Identifier | JSDocNamespaceDeclaration;
+    interface JSDocNamespaceDeclaration extends ModuleDeclaration {
+        name: Identifier;
+        body?: JSDocNamespaceBody;
+    }
+    interface ModuleBlock extends Node, Statement {
+        kind: SyntaxKind.ModuleBlock;
+        parent: ModuleDeclaration;
+        statements: NodeArray<Statement>;
+    }
+    type ModuleReference = EntityName | ExternalModuleReference;
+    /**
+     * One of:
+     * - import x = require("mod");
+     * - import x = M.x;
+     */
+    interface ImportEqualsDeclaration extends DeclarationStatement, JSDocContainer {
+        kind: SyntaxKind.ImportEqualsDeclaration;
+        parent: SourceFile | ModuleBlock;
+        name: Identifier;
+        moduleReference: ModuleReference;
+    }
+    interface ExternalModuleReference extends Node {
+        kind: SyntaxKind.ExternalModuleReference;
+        parent: ImportEqualsDeclaration;
+        expression: Expression;
+    }
+    interface ImportDeclaration extends Statement {
+        kind: SyntaxKind.ImportDeclaration;
+        parent: SourceFile | ModuleBlock;
+        importClause?: ImportClause;
+        /** If this is not a StringLiteral it will be a grammar error. */
+        moduleSpecifier: Expression;
+    }
+    type NamedImportBindings = NamespaceImport | NamedImports;
+    interface ImportClause extends NamedDeclaration {
+        kind: SyntaxKind.ImportClause;
+        parent: ImportDeclaration;
+        name?: Identifier;
+        namedBindings?: NamedImportBindings;
+    }
+    interface NamespaceImport extends NamedDeclaration {
+        kind: SyntaxKind.NamespaceImport;
+        parent: ImportClause;
+        name: Identifier;
+    }
+    interface NamespaceExportDeclaration extends DeclarationStatement {
+        kind: SyntaxKind.NamespaceExportDeclaration;
+        name: Identifier;
+    }
+    interface ExportDeclaration extends DeclarationStatement {
+        kind: SyntaxKind.ExportDeclaration;
+        parent: SourceFile | ModuleBlock;
+        /** Will not be assigned in the case of `export * from "foo";` */
+        exportClause?: NamedExports;
+        /** If this is not a StringLiteral it will be a grammar error. */
+        moduleSpecifier?: Expression;
+    }
+    interface NamedImports extends Node {
+        kind: SyntaxKind.NamedImports;
+        parent: ImportClause;
+        elements: NodeArray<ImportSpecifier>;
+    }
+    interface NamedExports extends Node {
+        kind: SyntaxKind.NamedExports;
+        parent: ExportDeclaration;
+        elements: NodeArray<ExportSpecifier>;
+    }
+    type NamedImportsOrExports = NamedImports | NamedExports;
+    interface ImportSpecifier extends NamedDeclaration {
+        kind: SyntaxKind.ImportSpecifier;
+        parent: NamedImports;
+        propertyName?: Identifier;
+        name: Identifier;
+    }
+    interface ExportSpecifier extends NamedDeclaration {
+        kind: SyntaxKind.ExportSpecifier;
+        parent: NamedExports;
+        propertyName?: Identifier;
+        name: Identifier;
+    }
+    type ImportOrExportSpecifier = ImportSpecifier | ExportSpecifier;
+    /**
+     * This is either an `export =` or an `export default` declaration.
+     * Unless `isExportEquals` is set, this node was parsed as an `export default`.
+     */
+    interface ExportAssignment extends DeclarationStatement {
+        kind: SyntaxKind.ExportAssignment;
+        parent: SourceFile;
+        isExportEquals?: boolean;
+        expression: Expression;
+    }
+    interface FileReference extends TextRange {
+        fileName: string;
+    }
+    interface CheckJsDirective extends TextRange {
+        enabled: boolean;
+    }
+    type CommentKind = SyntaxKind.SingleLineCommentTrivia | SyntaxKind.MultiLineCommentTrivia;
+    interface CommentRange extends TextRange {
+        hasTrailingNewLine?: boolean;
+        kind: CommentKind;
+    }
+    interface SynthesizedComment extends CommentRange {
+        text: string;
+        pos: -1;
+        end: -1;
+    }
+    interface JSDocTypeExpression extends TypeNode {
+        kind: SyntaxKind.JSDocTypeExpression;
+        type: TypeNode;
+    }
+    interface JSDocType extends TypeNode {
+        _jsDocTypeBrand: any;
+    }
+    interface JSDocAllType extends JSDocType {
+        kind: SyntaxKind.JSDocAllType;
+    }
+    interface JSDocUnknownType extends JSDocType {
+        kind: SyntaxKind.JSDocUnknownType;
+    }
+    interface JSDocNonNullableType extends JSDocType {
+        kind: SyntaxKind.JSDocNonNullableType;
+        type: TypeNode;
+    }
+    interface JSDocNullableType extends JSDocType {
+        kind: SyntaxKind.JSDocNullableType;
+        type: TypeNode;
+    }
+    interface JSDocOptionalType extends JSDocType {
+        kind: SyntaxKind.JSDocOptionalType;
+        type: TypeNode;
+    }
+    interface JSDocFunctionType extends JSDocType, SignatureDeclarationBase {
+        kind: SyntaxKind.JSDocFunctionType;
+    }
+    interface JSDocVariadicType extends JSDocType {
+        kind: SyntaxKind.JSDocVariadicType;
+        type: TypeNode;
+    }
+    type JSDocTypeReferencingNode = JSDocVariadicType | JSDocOptionalType | JSDocNullableType | JSDocNonNullableType;
+    interface JSDoc extends Node {
+        kind: SyntaxKind.JSDocComment;
+        parent: HasJSDoc;
+        tags?: NodeArray<JSDocTag>;
+        comment?: string;
+    }
+    interface JSDocTag extends Node {
+        parent: JSDoc | JSDocTypeLiteral;
+        atToken: AtToken;
+        tagName: Identifier;
+        comment?: string;
+    }
+    interface JSDocUnknownTag extends JSDocTag {
+        kind: SyntaxKind.JSDocTag;
+    }
+    /**
+     * Note that `@extends` is a synonym of `@augments`.
+     * Both tags are represented by this interface.
+     */
+    interface JSDocAugmentsTag extends JSDocTag {
+        kind: SyntaxKind.JSDocAugmentsTag;
+        class: ExpressionWithTypeArguments & {
+            expression: Identifier | PropertyAccessEntityNameExpression;
+        };
+    }
+    interface JSDocClassTag extends JSDocTag {
+        kind: SyntaxKind.JSDocClassTag;
+    }
+    interface JSDocTemplateTag extends JSDocTag {
+        kind: SyntaxKind.JSDocTemplateTag;
+        typeParameters: NodeArray<TypeParameterDeclaration>;
+    }
+    interface JSDocReturnTag extends JSDocTag {
+        kind: SyntaxKind.JSDocReturnTag;
+        typeExpression?: JSDocTypeExpression;
+    }
+    interface JSDocTypeTag extends JSDocTag {
+        kind: SyntaxKind.JSDocTypeTag;
+        typeExpression?: JSDocTypeExpression;
+    }
+    interface JSDocTypedefTag extends JSDocTag, NamedDeclaration {
+        parent: JSDoc;
+        kind: SyntaxKind.JSDocTypedefTag;
+        fullName?: JSDocNamespaceDeclaration | Identifier;
+        name?: Identifier;
+        typeExpression?: JSDocTypeExpression | JSDocTypeLiteral;
+    }
+    interface JSDocCallbackTag extends JSDocTag, NamedDeclaration {
+        parent: JSDoc;
+        kind: SyntaxKind.JSDocCallbackTag;
+        fullName?: JSDocNamespaceDeclaration | Identifier;
+        name?: Identifier;
+        typeExpression: JSDocSignature;
+    }
+    interface JSDocSignature extends JSDocType, Declaration {
+        kind: SyntaxKind.JSDocSignature;
+        typeParameters?: ReadonlyArray<JSDocTemplateTag>;
+        parameters: ReadonlyArray<JSDocParameterTag>;
+        type: JSDocReturnTag | undefined;
+    }
+    interface JSDocPropertyLikeTag extends JSDocTag, Declaration {
+        parent: JSDoc;
+        name: EntityName;
+        typeExpression?: JSDocTypeExpression;
+        /** Whether the property name came before the type -- non-standard for JSDoc, but Typescript-like */
+        isNameFirst: boolean;
+        isBracketed: boolean;
+    }
+    interface JSDocPropertyTag extends JSDocPropertyLikeTag {
+        kind: SyntaxKind.JSDocPropertyTag;
+    }
+    interface JSDocParameterTag extends JSDocPropertyLikeTag {
+        kind: SyntaxKind.JSDocParameterTag;
+    }
+    interface JSDocTypeLiteral extends JSDocType {
+        kind: SyntaxKind.JSDocTypeLiteral;
+        jsDocPropertyTags?: ReadonlyArray<JSDocPropertyLikeTag>;
+        /** If true, then this type literal represents an *array* of its type. */
+        isArrayType?: boolean;
+    }
+    enum FlowFlags {
+        Unreachable = 1,
+        Start = 2,
+        BranchLabel = 4,
+        LoopLabel = 8,
+        Assignment = 16,
+        TrueCondition = 32,
+        FalseCondition = 64,
+        SwitchClause = 128,
+        ArrayMutation = 256,
+        Referenced = 512,
+        Shared = 1024,
+        PreFinally = 2048,
+        AfterFinally = 4096,
+        Label = 12,
+        Condition = 96
+    }
+    interface FlowLock {
+        locked?: boolean;
+    }
+    interface AfterFinallyFlow extends FlowNodeBase, FlowLock {
+        antecedent: FlowNode;
+    }
+    interface PreFinallyFlow extends FlowNodeBase {
+        antecedent: FlowNode;
+        lock: FlowLock;
+    }
+    type FlowNode = AfterFinallyFlow | PreFinallyFlow | FlowStart | FlowLabel | FlowAssignment | FlowCondition | FlowSwitchClause | FlowArrayMutation;
+    interface FlowNodeBase {
+        flags: FlowFlags;
+        id?: number;
+    }
+    interface FlowStart extends FlowNodeBase {
+        container?: FunctionExpression | ArrowFunction | MethodDeclaration;
+    }
+    interface FlowLabel extends FlowNodeBase {
+        antecedents: FlowNode[] | undefined;
+    }
+    interface FlowAssignment extends FlowNodeBase {
+        node: Expression | VariableDeclaration | BindingElement;
+        antecedent: FlowNode;
+    }
+    interface FlowCondition extends FlowNodeBase {
+        expression: Expression;
+        antecedent: FlowNode;
+    }
+    interface FlowSwitchClause extends FlowNodeBase {
+        switchStatement: SwitchStatement;
+        clauseStart: number;
+        clauseEnd: number;
+        antecedent: FlowNode;
+    }
+    interface FlowArrayMutation extends FlowNodeBase {
+        node: CallExpression | BinaryExpression;
+        antecedent: FlowNode;
+    }
+    type FlowType = Type | IncompleteType;
+    interface IncompleteType {
+        flags: TypeFlags;
+        type: Type;
+    }
+    interface AmdDependency {
+        path: string;
+        name?: string;
+    }
+    /**
+     * Subset of properties from SourceFile that are used in multiple utility functions
+     */
+    interface SourceFileLike {
+        readonly text: string;
+        lineMap?: ReadonlyArray<number>;
+    }
+    interface RedirectInfo {
+        /** Source file this redirects to. */
+        readonly redirectTarget: SourceFile;
+        /**
+         * Source file for the duplicate package. This will not be used by the Program,
+         * but we need to keep this around so we can watch for changes in underlying.
+         */
+        readonly unredirected: SourceFile;
+    }
+    interface SourceFile extends Declaration {
+        kind: SyntaxKind.SourceFile;
+        statements: NodeArray<Statement>;
+        endOfFileToken: Token<SyntaxKind.EndOfFileToken>;
+        fileName: string;
+        path: Path;
+        text: string;
+        resolvedPath: Path;
+        /**
+         * If two source files are for the same version of the same package, one will redirect to the other.
+         * (See `createRedirectSourceFile` in program.ts.)
+         * The redirect will have this set. The redirected-to source file will be in `redirectTargetsSet`.
+         */
+        redirectInfo?: RedirectInfo;
+        amdDependencies: ReadonlyArray<AmdDependency>;
+        moduleName?: string;
+        referencedFiles: ReadonlyArray<FileReference>;
+        typeReferenceDirectives: ReadonlyArray<FileReference>;
+        libReferenceDirectives: ReadonlyArray<FileReference>;
+        languageVariant: LanguageVariant;
+        isDeclarationFile: boolean;
+        renamedDependencies?: ReadonlyMap<string>;
+        /**
+         * lib.d.ts should have a reference comment like
+         *
+         *  /// <reference no-default-lib="true"/>
+         *
+         * If any other file has this comment, it signals not to include lib.d.ts
+         * because this containing file is intended to act as a default library.
+         */
+        hasNoDefaultLib: boolean;
+        languageVersion: ScriptTarget;
+        scriptKind: ScriptKind;
+        /**
+         * The first "most obvious" node that makes a file an external module.
+         * This is intended to be the first top-level import/export,
+         * but could be arbitrarily nested (e.g. `import.meta`).
+         */
+        externalModuleIndicator?: Node;
+        commonJsModuleIndicator?: Node;
+        identifiers: Map<string>;
+        nodeCount: number;
+        identifierCount: number;
+        symbolCount: number;
+        parseDiagnostics: DiagnosticWithLocation[];
+        bindDiagnostics: DiagnosticWithLocation[];
+        bindSuggestionDiagnostics?: DiagnosticWithLocation[];
+        jsDocDiagnostics?: DiagnosticWithLocation[];
+        additionalSyntacticDiagnostics?: ReadonlyArray<DiagnosticWithLocation>;
+        lineMap: ReadonlyArray<number>;
+        classifiableNames?: ReadonlyUnderscoreEscapedMap<true>;
+        resolvedModules?: Map<ResolvedModuleFull | undefined>;
+        resolvedTypeReferenceDirectiveNames: Map<ResolvedTypeReferenceDirective>;
+        imports: ReadonlyArray<StringLiteralLike>;
+        /**
+         * When a file's references are redirected due to project reference directives,
+         * the original names of the references are stored in this array
+         */
+        redirectedReferences?: ReadonlyArray<string>;
+        moduleAugmentations: ReadonlyArray<StringLiteral | Identifier>;
+        patternAmbientModules?: PatternAmbientModule[];
+        ambientModuleNames: ReadonlyArray<string>;
+        checkJsDirective?: CheckJsDirective;
+        version: string;
+        pragmas: PragmaMap;
+        localJsxNamespace?: __String;
+        localJsxFactory?: EntityName;
+    }
+    interface Bundle extends Node {
+        kind: SyntaxKind.Bundle;
+        prepends: ReadonlyArray<InputFiles | UnparsedSource>;
+        sourceFiles: ReadonlyArray<SourceFile>;
+        syntheticFileReferences?: ReadonlyArray<FileReference>;
+        syntheticTypeReferences?: ReadonlyArray<FileReference>;
+        hasNoDefaultLib?: boolean;
+    }
+    interface InputFiles extends Node {
+        kind: SyntaxKind.InputFiles;
+        javascriptText: string;
+        javascriptMapText?: string;
+        declarationText: string;
+        declarationMapText?: string;
+    }
+    interface UnparsedSource extends Node {
+        kind: SyntaxKind.UnparsedSource;
+        text: string;
+        sourceMapText?: string;
+    }
+    interface JsonSourceFile extends SourceFile {
+        statements: NodeArray<JsonObjectExpressionStatement>;
+    }
+    interface TsConfigSourceFile extends JsonSourceFile {
+        extendedSourceFiles?: string[];
+    }
+    interface JsonMinusNumericLiteral extends PrefixUnaryExpression {
+        kind: SyntaxKind.PrefixUnaryExpression;
+        operator: SyntaxKind.MinusToken;
+        operand: NumericLiteral;
+    }
+    interface JsonObjectExpressionStatement extends ExpressionStatement {
+        expression: ObjectLiteralExpression | ArrayLiteralExpression | JsonMinusNumericLiteral | NumericLiteral | StringLiteral | BooleanLiteral | NullLiteral;
+    }
+    interface ScriptReferenceHost {
+        getCompilerOptions(): CompilerOptions;
+        getSourceFile(fileName: string): SourceFile | undefined;
+        getSourceFileByPath(path: Path): SourceFile | undefined;
+        getCurrentDirectory(): string;
+    }
+    interface ParseConfigHost {
+        useCaseSensitiveFileNames: boolean;
+        readDirectory(rootDir: string, extensions: ReadonlyArray<string>, excludes: ReadonlyArray<string> | undefined, includes: ReadonlyArray<string>, depth?: number): string[];
+        /**
+         * Gets a value indicating whether the specified path exists and is a file.
+         * @param path The path to test.
+         */
+        fileExists(path: string): boolean;
+        readFile(path: string): string | undefined;
+    }
+    type WriteFileCallback = (fileName: string, data: string, writeByteOrderMark: boolean, onError: ((message: string) => void) | undefined, sourceFiles?: ReadonlyArray<SourceFile>) => void;
+    class OperationCanceledException {
+    }
+    interface CancellationToken {
+        isCancellationRequested(): boolean;
+        /** @throws OperationCanceledException if isCancellationRequested is true */
+        throwIfCancellationRequested(): void;
+    }
+    interface Program extends ScriptReferenceHost {
+        /**
+         * Get a list of root file names that were passed to a 'createProgram'
+         */
+        getRootFileNames(): ReadonlyArray<string>;
+        /**
+         * Get a list of files in the program
+         */
+        getSourceFiles(): ReadonlyArray<SourceFile>;
+        /**
+         * Get a list of file names that were passed to 'createProgram' or referenced in a
+         * program source file but could not be located.
+         */
+        getMissingFilePaths(): ReadonlyArray<Path>;
+        /**
+         * Emits the JavaScript and declaration files.  If targetSourceFile is not specified, then
+         * the JavaScript and declaration files will be produced for all the files in this program.
+         * If targetSourceFile is specified, then only the JavaScript and declaration for that
+         * specific file will be generated.
+         *
+         * If writeFile is not specified then the writeFile callback from the compiler host will be
+         * used for writing the JavaScript and declaration files.  Otherwise, the writeFile parameter
+         * will be invoked when writing the JavaScript and declaration files.
+         */
+        emit(targetSourceFile?: SourceFile, writeFile?: WriteFileCallback, cancellationToken?: CancellationToken, emitOnlyDtsFiles?: boolean, customTransformers?: CustomTransformers): EmitResult;
+        getOptionsDiagnostics(cancellationToken?: CancellationToken): ReadonlyArray<Diagnostic>;
+        getGlobalDiagnostics(cancellationToken?: CancellationToken): ReadonlyArray<Diagnostic>;
+        getSyntacticDiagnostics(sourceFile?: SourceFile, cancellationToken?: CancellationToken): ReadonlyArray<DiagnosticWithLocation>;
+        /** The first time this is called, it will return global diagnostics (no location). */
+        getSemanticDiagnostics(sourceFile?: SourceFile, cancellationToken?: CancellationToken): ReadonlyArray<Diagnostic>;
+        getDeclarationDiagnostics(sourceFile?: SourceFile, cancellationToken?: CancellationToken): ReadonlyArray<DiagnosticWithLocation>;
+        getConfigFileParsingDiagnostics(): ReadonlyArray<Diagnostic>;
+        getSuggestionDiagnostics(sourceFile: SourceFile, cancellationToken?: CancellationToken): ReadonlyArray<DiagnosticWithLocation>;
+        /**
+         * Gets a type checker that can be used to semantically analyze source files in the program.
+         */
+        getTypeChecker(): TypeChecker;
+        getCommonSourceDirectory(): string;
+        getDiagnosticsProducingTypeChecker(): TypeChecker;
+        dropDiagnosticsProducingTypeChecker(): void;
+        getClassifiableNames(): UnderscoreEscapedMap<true>;
+        getNodeCount(): number;
+        getIdentifierCount(): number;
+        getSymbolCount(): number;
+        getTypeCount(): number;
+        getFileProcessingDiagnostics(): DiagnosticCollection;
+        getResolvedTypeReferenceDirectives(): Map<ResolvedTypeReferenceDirective>;
+        isSourceFileFromExternalLibrary(file: SourceFile): boolean;
+        isSourceFileDefaultLibrary(file: SourceFile): boolean;
+        structureIsReused?: StructureIsReused;
+        getSourceFileFromReference(referencingFile: SourceFile, ref: FileReference): SourceFile | undefined;
+        getLibFileFromReference(ref: FileReference): SourceFile | undefined;
+        /** Given a source file, get the name of the package it was imported from. */
+        sourceFileToPackageName: Map<string>;
+        /** Set of all source files that some other source file redirects to. */
+        redirectTargetsSet: Map<true>;
+        /** Is the file emitted file */
+        isEmittedFile(file: string): boolean;
+        getResolvedModuleWithFailedLookupLocationsFromCache(moduleName: string, containingFile: string): ResolvedModuleWithFailedLookupLocations | undefined;
+        getProjectReferences(): (ResolvedProjectReference | undefined)[] | undefined;
+    }
+    interface ResolvedProjectReference {
+        commandLine: ParsedCommandLine;
+        sourceFile: SourceFile;
+    }
+    enum StructureIsReused {
+        Not = 0,
+        SafeModules = 1,
+        Completely = 2
+    }
+    interface CustomTransformers {
+        /** Custom transformers to evaluate before built-in .js transformations. */
+        before?: TransformerFactory<SourceFile>[];
+        /** Custom transformers to evaluate after built-in .js transformations. */
+        after?: TransformerFactory<SourceFile>[];
+        /** Custom transformers to evaluate after built-in .d.ts transformations. */
+        afterDeclarations?: TransformerFactory<Bundle | SourceFile>[];
+    }
+    interface SourceMapSpan {
+        /** Line number in the .js file. */
+        emittedLine: number;
+        /** Column number in the .js file. */
+        emittedColumn: number;
+        /** Line number in the .ts file. */
+        sourceLine: number;
+        /** Column number in the .ts file. */
+        sourceColumn: number;
+        /** Optional name (index into names array) associated with this span. */
+        nameIndex?: number;
+        /** .ts file (index into sources array) associated with this span */
+        sourceIndex: number;
+    }
+    interface SourceMapData {
+        sourceMapFilePath: string;
+        jsSourceMappingURL: string;
+        sourceMapFile: string;
+        sourceMapSourceRoot: string;
+        sourceMapSources: string[];
+        sourceMapSourcesContent?: string[];
+        inputSourceFileNames: string[];
+        sourceMapNames?: string[];
+        sourceMapMappings: string;
+        sourceMapDecodedMappings: SourceMapSpan[];
+    }
+    /** Return code used by getEmitOutput function to indicate status of the function */
+    enum ExitStatus {
+        Success = 0,
+        DiagnosticsPresent_OutputsSkipped = 1,
+        DiagnosticsPresent_OutputsGenerated = 2
+    }
+    interface EmitResult {
+        emitSkipped: boolean;
+        /** Contains declaration emit diagnostics */
+        diagnostics: ReadonlyArray<Diagnostic>;
+        emittedFiles?: string[];
+        sourceMaps?: SourceMapData[];
+    }
+    interface TypeCheckerHost {
+        getCompilerOptions(): CompilerOptions;
+        getSourceFiles(): ReadonlyArray<SourceFile>;
+        getSourceFile(fileName: string): SourceFile | undefined;
+        getResolvedTypeReferenceDirectives(): ReadonlyMap<ResolvedTypeReferenceDirective>;
+    }
+    interface TypeChecker {
+        getTypeOfSymbolAtLocation(symbol: Symbol, node: Node): Type;
+        getDeclaredTypeOfSymbol(symbol: Symbol): Type;
+        getPropertiesOfType(type: Type): Symbol[];
+        getPropertyOfType(type: Type, propertyName: string): Symbol | undefined;
+        getIndexInfoOfType(type: Type, kind: IndexKind): IndexInfo | undefined;
+        getSignaturesOfType(type: Type, kind: SignatureKind): Signature[];
+        getIndexTypeOfType(type: Type, kind: IndexKind): Type | undefined;
+        getBaseTypes(type: InterfaceType): BaseType[];
+        getBaseTypeOfLiteralType(type: Type): Type;
+        getWidenedType(type: Type): Type;
+        getReturnTypeOfSignature(signature: Signature): Type;
+        /**
+         * Gets the type of a parameter at a given position in a signature.
+         * Returns `any` if the index is not valid.
+         */
+        getParameterType(signature: Signature, parameterIndex: number): Type;
+        getNullableType(type: Type, flags: TypeFlags): Type;
+        getNonNullableType(type: Type): Type;
+        /** Note that the resulting nodes cannot be checked. */
+        typeToTypeNode(type: Type, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): TypeNode | undefined;
+        typeToTypeNode(type: Type, enclosingDeclaration?: Node, flags?: NodeBuilderFlags, tracker?: SymbolTracker): TypeNode | undefined;
+        /** Note that the resulting nodes cannot be checked. */
+        signatureToSignatureDeclaration(signature: Signature, kind: SyntaxKind, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): (SignatureDeclaration & {
+            typeArguments?: NodeArray<TypeNode>;
+        }) | undefined;
+        /** Note that the resulting nodes cannot be checked. */
+        indexInfoToIndexSignatureDeclaration(indexInfo: IndexInfo, kind: IndexKind, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): IndexSignatureDeclaration | undefined;
+        /** Note that the resulting nodes cannot be checked. */
+        symbolToEntityName(symbol: Symbol, meaning: SymbolFlags, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): EntityName | undefined;
+        /** Note that the resulting nodes cannot be checked. */
+        symbolToExpression(symbol: Symbol, meaning: SymbolFlags, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): Expression | undefined;
+        /** Note that the resulting nodes cannot be checked. */
+        symbolToTypeParameterDeclarations(symbol: Symbol, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): NodeArray<TypeParameterDeclaration> | undefined;
+        /** Note that the resulting nodes cannot be checked. */
+        symbolToParameterDeclaration(symbol: Symbol, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): ParameterDeclaration | undefined;
+        /** Note that the resulting nodes cannot be checked. */
+        typeParameterToDeclaration(parameter: TypeParameter, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): TypeParameterDeclaration | undefined;
+        getSymbolsInScope(location: Node, meaning: SymbolFlags): Symbol[];
+        getSymbolAtLocation(node: Node): Symbol | undefined;
+        getSymbolsOfParameterPropertyDeclaration(parameter: ParameterDeclaration, parameterName: string): Symbol[];
+        /**
+         * The function returns the value (local variable) symbol of an identifier in the short-hand property assignment.
+         * This is necessary as an identifier in short-hand property assignment can contains two meaning: property name and property value.
+         */
+        getShorthandAssignmentValueSymbol(location: Node): Symbol | undefined;
+        getExportSpecifierLocalTargetSymbol(location: ExportSpecifier): Symbol | undefined;
+        /**
+         * If a symbol is a local symbol with an associated exported symbol, returns the exported symbol.
+         * Otherwise returns its input.
+         * For example, at `export type T = number;`:
+         *     - `getSymbolAtLocation` at the location `T` will return the exported symbol for `T`.
+         *     - But the result of `getSymbolsInScope` will contain the *local* symbol for `T`, not the exported symbol.
+         *     - Calling `getExportSymbolOfSymbol` on that local symbol will return the exported symbol.
+         */
+        getExportSymbolOfSymbol(symbol: Symbol): Symbol;
+        getPropertySymbolOfDestructuringAssignment(location: Identifier): Symbol | undefined;
+        getTypeAtLocation(node: Node): Type | undefined;
+        getTypeFromTypeNode(node: TypeNode): Type;
+        signatureToString(signature: Signature, enclosingDeclaration?: Node, flags?: TypeFormatFlags, kind?: SignatureKind): string;
+        typeToString(type: Type, enclosingDeclaration?: Node, flags?: TypeFormatFlags): string;
+        symbolToString(symbol: Symbol, enclosingDeclaration?: Node, meaning?: SymbolFlags, flags?: SymbolFormatFlags): string;
+        typePredicateToString(predicate: TypePredicate, enclosingDeclaration?: Node, flags?: TypeFormatFlags): string;
+        writeSignature(signature: Signature, enclosingDeclaration?: Node, flags?: TypeFormatFlags, kind?: SignatureKind, writer?: EmitTextWriter): string;
+        writeType(type: Type, enclosingDeclaration?: Node, flags?: TypeFormatFlags, writer?: EmitTextWriter): string;
+        writeSymbol(symbol: Symbol, enclosingDeclaration?: Node, meaning?: SymbolFlags, flags?: SymbolFormatFlags, writer?: EmitTextWriter): string;
+        writeTypePredicate(predicate: TypePredicate, enclosingDeclaration?: Node, flags?: TypeFormatFlags, writer?: EmitTextWriter): string;
+        /**
+         * @deprecated Use the createX factory functions or XToY typechecker methods and `createPrinter` or the `xToString` methods instead
+         * This will be removed in a future version.
+         */
+        getSymbolDisplayBuilder(): SymbolDisplayBuilder;
+        getFullyQualifiedName(symbol: Symbol): string;
+        getAugmentedPropertiesOfType(type: Type): Symbol[];
+        getRootSymbols(symbol: Symbol): Symbol[];
+        getContextualType(node: Expression): Type | undefined;
+        getContextualTypeForArgumentAtIndex(call: CallLikeExpression, argIndex: number): Type | undefined;
+        getContextualTypeForJsxAttribute(attribute: JsxAttribute | JsxSpreadAttribute): Type | undefined;
+        isContextSensitive(node: Expression | MethodDeclaration | ObjectLiteralElementLike | JsxAttributeLike): boolean;
+        /**
+         * returns unknownSignature in the case of an error.
+         * returns undefined if the node is not valid.
+         * @param argumentCount Apparent number of arguments, passed in case of a possibly incomplete call. This should come from an ArgumentListInfo. See `signatureHelp.ts`.
+         */
+        getResolvedSignature(node: CallLikeExpression, candidatesOutArray?: Signature[], argumentCount?: number): Signature | undefined;
+        getSignatureFromDeclaration(declaration: SignatureDeclaration): Signature | undefined;
+        isImplementationOfOverload(node: SignatureDeclaration): boolean | undefined;
+        isUndefinedSymbol(symbol: Symbol): boolean;
+        isArgumentsSymbol(symbol: Symbol): boolean;
+        isUnknownSymbol(symbol: Symbol): boolean;
+        getMergedSymbol(symbol: Symbol): Symbol;
+        getConstantValue(node: EnumMember | PropertyAccessExpression | ElementAccessExpression): string | number | undefined;
+        isValidPropertyAccess(node: PropertyAccessExpression | QualifiedName | ImportTypeNode, propertyName: string): boolean;
+        /** Exclude accesses to private properties or methods with a `this` parameter that `type` doesn't satisfy. */
+        isValidPropertyAccessForCompletions(node: PropertyAccessExpression | ImportTypeNode, type: Type, property: Symbol): boolean;
+        /** Follow all aliases to get the original symbol. */
+        getAliasedSymbol(symbol: Symbol): Symbol;
+        /** Follow a *single* alias to get the immediately aliased symbol. */
+        getImmediateAliasedSymbol(symbol: Symbol): Symbol | undefined;
+        getExportsOfModule(moduleSymbol: Symbol): Symbol[];
+        /** Unlike `getExportsOfModule`, this includes properties of an `export =` value. */
+        getExportsAndPropertiesOfModule(moduleSymbol: Symbol): Symbol[];
+        getAllAttributesTypeFromJsxOpeningLikeElement(elementNode: JsxOpeningLikeElement): Type | undefined;
+        getJsxIntrinsicTagNamesAt(location: Node): Symbol[];
+        isOptionalParameter(node: ParameterDeclaration): boolean;
+        getAmbientModules(): Symbol[];
+        tryGetMemberInModuleExports(memberName: string, moduleSymbol: Symbol): Symbol | undefined;
+        /**
+         * Unlike `tryGetMemberInModuleExports`, this includes properties of an `export =` value.
+         * Does *not* return properties of primitive types.
+         */
+        tryGetMemberInModuleExportsAndProperties(memberName: string, moduleSymbol: Symbol): Symbol | undefined;
+        getApparentType(type: Type): Type;
+        getSuggestionForNonexistentProperty(node: Identifier, containingType: Type): string | undefined;
+        getSuggestionForNonexistentSymbol(location: Node, name: string, meaning: SymbolFlags): string | undefined;
+        getSuggestionForNonexistentModule(node: Identifier, target: Symbol): string | undefined;
+        getBaseConstraintOfType(type: Type): Type | undefined;
+        getDefaultFromTypeParameter(type: Type): Type | undefined;
+        getAnyType(): Type;
+        getStringType(): Type;
+        getNumberType(): Type;
+        getBooleanType(): Type;
+        getFalseType(): Type;
+        getTrueType(): Type;
+        getVoidType(): Type;
+        getUndefinedType(): Type;
+        getNullType(): Type;
+        getESSymbolType(): Type;
+        getNeverType(): Type;
+        getUnionType(types: Type[], subtypeReduction?: UnionReduction): Type;
+        createArrayType(elementType: Type): Type;
+        createPromiseType(type: Type): Type;
+        createAnonymousType(symbol: Symbol, members: SymbolTable, callSignatures: Signature[], constructSignatures: Signature[], stringIndexInfo: IndexInfo | undefined, numberIndexInfo: IndexInfo | undefined): Type;
+        createSignature(declaration: SignatureDeclaration, typeParameters: TypeParameter[] | undefined, thisParameter: Symbol | undefined, parameters: Symbol[], resolvedReturnType: Type, typePredicate: TypePredicate | undefined, minArgumentCount: number, hasRestParameter: boolean, hasLiteralTypes: boolean): Signature;
+        createSymbol(flags: SymbolFlags, name: __String): TransientSymbol;
+        createIndexInfo(type: Type, isReadonly: boolean, declaration?: SignatureDeclaration): IndexInfo;
+        isSymbolAccessible(symbol: Symbol, enclosingDeclaration: Node | undefined, meaning: SymbolFlags, shouldComputeAliasToMarkVisible: boolean): SymbolAccessibilityResult;
+        tryFindAmbientModuleWithoutAugmentations(moduleName: string): Symbol | undefined;
+        getSymbolWalker(accept?: (symbol: Symbol) => boolean): SymbolWalker;
+        getDiagnostics(sourceFile?: SourceFile, cancellationToken?: CancellationToken): Diagnostic[];
+        getGlobalDiagnostics(): Diagnostic[];
+        getEmitResolver(sourceFile?: SourceFile, cancellationToken?: CancellationToken): EmitResolver;
+        getNodeCount(): number;
+        getIdentifierCount(): number;
+        getSymbolCount(): number;
+        getTypeCount(): number;
+        isArrayLikeType(type: Type): boolean;
+        /**
+         * For a union, will include a property if it's defined in *any* of the member types.
+         * So for `{ a } | { b }`, this will include both `a` and `b`.
+         * Does not include properties of primitive types.
+         */
+        getAllPossiblePropertiesOfTypes(type: ReadonlyArray<Type>): Symbol[];
+        resolveName(name: string, location: Node, meaning: SymbolFlags, excludeGlobals: boolean): Symbol | undefined;
+        getJsxNamespace(location?: Node): string;
+        /**
+         * Note that this will return undefined in the following case:
+         *     // a.ts
+         *     export namespace N { export class C { } }
+         *     // b.ts
+         *     <<enclosingDeclaration>>
+         * Where `C` is the symbol we're looking for.
+         * This should be called in a loop climbing parents of the symbol, so we'll get `N`.
+         */
+        getAccessibleSymbolChain(symbol: Symbol, enclosingDeclaration: Node | undefined, meaning: SymbolFlags, useOnlyExternalAliasing: boolean): Symbol[] | undefined;
+        getTypePredicateOfSignature(signature: Signature): TypePredicate;
+        resolveExternalModuleSymbol(symbol: Symbol): Symbol;
+        /** @param node A location where we might consider accessing `this`. Not necessarily a ThisExpression. */
+        tryGetThisTypeAt(node: Node): Type | undefined;
+        getTypeArgumentConstraint(node: TypeNode): Type | undefined;
+        /**
+         * Does *not* get *all* suggestion diagnostics, just the ones that were convenient to report in the checker.
+         * Others are added in computeSuggestionDiagnostics.
+         */
+        getSuggestionDiagnostics(file: SourceFile, cancellationToken?: CancellationToken): ReadonlyArray<DiagnosticWithLocation>;
+        /**
+         * Depending on the operation performed, it may be appropriate to throw away the checker
+         * if the cancellation token is triggered. Typically, if it is used for error checking
+         * and the operation is cancelled, then it should be discarded, otherwise it is safe to keep.
+         */
+        runWithCancellationToken<T>(token: CancellationToken, cb: (checker: TypeChecker) => T): T;
+    }
+    enum UnionReduction {
+        None = 0,
+        Literal = 1,
+        Subtype = 2
+    }
+    enum NodeBuilderFlags {
+        None = 0,
+        NoTruncation = 1,
+        WriteArrayAsGenericType = 2,
+        GenerateNamesForShadowedTypeParams = 4,
+        UseStructuralFallback = 8,
+        ForbidIndexedAccessSymbolReferences = 16,
+        WriteTypeArgumentsOfSignature = 32,
+        UseFullyQualifiedType = 64,
+        UseOnlyExternalAliasing = 128,
+        SuppressAnyReturnType = 256,
+        WriteTypeParametersInQualifiedName = 512,
+        MultilineObjectLiterals = 1024,
+        WriteClassExpressionAsTypeLiteral = 2048,
+        UseTypeOfFunction = 4096,
+        OmitParameterModifiers = 8192,
+        UseAliasDefinedOutsideCurrentScope = 16384,
+        AllowThisInObjectLiteral = 32768,
+        AllowQualifedNameInPlaceOfIdentifier = 65536,
+        AllowAnonymousIdentifier = 131072,
+        AllowEmptyUnionOrIntersection = 262144,
+        AllowEmptyTuple = 524288,
+        AllowUniqueESSymbolType = 1048576,
+        AllowEmptyIndexInfoType = 2097152,
+        IgnoreErrors = 3112960,
+        InObjectTypeLiteral = 4194304,
+        InTypeAlias = 8388608,
+        InInitialEntityName = 16777216,
+        InReverseMappedType = 33554432
+    }
+    enum TypeFormatFlags {
+        None = 0,
+        NoTruncation = 1,
+        WriteArrayAsGenericType = 2,
+        UseStructuralFallback = 8,
+        WriteTypeArgumentsOfSignature = 32,
+        UseFullyQualifiedType = 64,
+        SuppressAnyReturnType = 256,
+        MultilineObjectLiterals = 1024,
+        WriteClassExpressionAsTypeLiteral = 2048,
+        UseTypeOfFunction = 4096,
+        OmitParameterModifiers = 8192,
+        UseAliasDefinedOutsideCurrentScope = 16384,
+        AllowUniqueESSymbolType = 1048576,
+        AddUndefined = 131072,
+        WriteArrowStyleSignature = 262144,
+        InArrayType = 524288,
+        InElementType = 2097152,
+        InFirstTypeArgument = 4194304,
+        InTypeAlias = 8388608,
+        /** @deprecated */ WriteOwnNameForAnyLike = 0,
+        NodeBuilderFlagsMask = 9469291
+    }
+    enum SymbolFormatFlags {
+        None = 0,
+        WriteTypeParametersOrArguments = 1,
+        UseOnlyExternalAliasing = 2,
+        AllowAnyNodeKind = 4,
+        UseAliasDefinedOutsideCurrentScope = 8
+    }
+    interface SymbolWalker {
+        /** Note: Return values are not ordered. */
+        walkType(root: Type): {
+            visitedTypes: ReadonlyArray<Type>;
+            visitedSymbols: ReadonlyArray<Symbol>;
+        };
+        /** Note: Return values are not ordered. */
+        walkSymbol(root: Symbol): {
+            visitedTypes: ReadonlyArray<Type>;
+            visitedSymbols: ReadonlyArray<Symbol>;
+        };
+    }
+    /**
+     * @deprecated
+     */
+    interface SymbolDisplayBuilder {
+        /** @deprecated */ buildTypeDisplay(type: Type, writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags): void;
+        /** @deprecated */ buildSymbolDisplay(symbol: Symbol, writer: SymbolWriter, enclosingDeclaration?: Node, meaning?: SymbolFlags, flags?: SymbolFormatFlags): void;
+        /** @deprecated */ buildSignatureDisplay(signature: Signature, writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags, kind?: SignatureKind): void;
+        /** @deprecated */ buildIndexSignatureDisplay(info: IndexInfo, writer: SymbolWriter, kind: IndexKind, enclosingDeclaration?: Node, globalFlags?: TypeFormatFlags, symbolStack?: Symbol[]): void;
+        /** @deprecated */ buildParameterDisplay(parameter: Symbol, writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags): void;
+        /** @deprecated */ buildTypeParameterDisplay(tp: TypeParameter, writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags): void;
+        /** @deprecated */ buildTypePredicateDisplay(predicate: TypePredicate, writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags): void;
+        /** @deprecated */ buildTypeParameterDisplayFromSymbol(symbol: Symbol, writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags): void;
+        /** @deprecated */ buildDisplayForParametersAndDelimiters(thisParameter: Symbol, parameters: Symbol[], writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags): void;
+        /** @deprecated */ buildDisplayForTypeParametersAndDelimiters(typeParameters: TypeParameter[], writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags): void;
+        /** @deprecated */ buildReturnTypeDisplay(signature: Signature, writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags): void;
+    }
+    /**
+     * @deprecated Migrate to other methods of generating symbol names, ex symbolToEntityName + a printer or symbolToString
+     */
+    interface SymbolWriter extends SymbolTracker {
+        writeKeyword(text: string): void;
+        writeOperator(text: string): void;
+        writePunctuation(text: string): void;
+        writeSpace(text: string): void;
+        writeStringLiteral(text: string): void;
+        writeParameter(text: string): void;
+        writeProperty(text: string): void;
+        writeSymbol(text: string, symbol: Symbol): void;
+        writeLine(): void;
+        increaseIndent(): void;
+        decreaseIndent(): void;
+        clear(): void;
+    }
+    enum SymbolAccessibility {
+        Accessible = 0,
+        NotAccessible = 1,
+        CannotBeNamed = 2
+    }
+    enum SyntheticSymbolKind {
+        UnionOrIntersection = 0,
+        Spread = 1
+    }
+    enum TypePredicateKind {
+        This = 0,
+        Identifier = 1
+    }
+    interface TypePredicateBase {
+        kind: TypePredicateKind;
+        type: Type;
+    }
+    interface ThisTypePredicate extends TypePredicateBase {
+        kind: TypePredicateKind.This;
+    }
+    interface IdentifierTypePredicate extends TypePredicateBase {
+        kind: TypePredicateKind.Identifier;
+        parameterName: string;
+        parameterIndex: number;
+    }
+    type TypePredicate = IdentifierTypePredicate | ThisTypePredicate;
+    type AnyImportSyntax = ImportDeclaration | ImportEqualsDeclaration;
+    type AnyImportOrReExport = AnyImportSyntax | ExportDeclaration;
+    interface ValidImportTypeNode extends ImportTypeNode {
+        argument: LiteralTypeNode & {
+            literal: StringLiteral;
+        };
+    }
+    type AnyValidImportOrReExport = (ImportDeclaration | ExportDeclaration) & {
+        moduleSpecifier: StringLiteral;
+    } | ImportEqualsDeclaration & {
+        moduleReference: ExternalModuleReference & {
+            expression: StringLiteral;
+        };
+    } | RequireOrImportCall | ValidImportTypeNode;
+    type RequireOrImportCall = CallExpression & {
+        arguments: [StringLiteralLike];
+    };
+    type LateVisibilityPaintedStatement = AnyImportSyntax | VariableStatement | ClassDeclaration | FunctionDeclaration | ModuleDeclaration | TypeAliasDeclaration | InterfaceDeclaration | EnumDeclaration;
+    interface SymbolVisibilityResult {
+        accessibility: SymbolAccessibility;
+        aliasesToMakeVisible?: LateVisibilityPaintedStatement[];
+        errorSymbolName?: string;
+        errorNode?: Node;
+    }
+    interface SymbolAccessibilityResult extends SymbolVisibilityResult {
+        errorModuleName?: string;
+    }
+    interface AllAccessorDeclarations {
+        firstAccessor: AccessorDeclaration;
+        secondAccessor: AccessorDeclaration | undefined;
+        getAccessor: AccessorDeclaration | undefined;
+        setAccessor: AccessorDeclaration | undefined;
+    }
+    /** Indicates how to serialize the name for a TypeReferenceNode when emitting decorator metadata */
+    enum TypeReferenceSerializationKind {
+        Unknown = 0,
+        TypeWithConstructSignatureAndValue = 1,
+        VoidNullableOrNeverType = 2,
+        NumberLikeType = 3,
+        StringLikeType = 4,
+        BooleanType = 5,
+        ArrayLikeType = 6,
+        ESSymbolType = 7,
+        Promise = 8,
+        TypeWithCallSignature = 9,
+        ObjectType = 10
+    }
+    interface EmitResolver {
+        hasGlobalName(name: string): boolean;
+        getReferencedExportContainer(node: Identifier, prefixLocals?: boolean): SourceFile | ModuleDeclaration | EnumDeclaration | undefined;
+        getReferencedImportDeclaration(node: Identifier): Declaration | undefined;
+        getReferencedDeclarationWithCollidingName(node: Identifier): Declaration | undefined;
+        isDeclarationWithCollidingName(node: Declaration): boolean;
+        isValueAliasDeclaration(node: Node): boolean;
+        isReferencedAliasDeclaration(node: Node, checkChildren?: boolean): boolean;
+        isTopLevelValueImportEqualsWithEntityName(node: ImportEqualsDeclaration): boolean;
+        getNodeCheckFlags(node: Node): NodeCheckFlags;
+        isDeclarationVisible(node: Declaration | AnyImportSyntax): boolean;
+        isLateBound(node: Declaration): node is LateBoundDeclaration;
+        collectLinkedAliases(node: Identifier): Node[] | undefined;
+        isImplementationOfOverload(node: FunctionLike): boolean | undefined;
+        isRequiredInitializedParameter(node: ParameterDeclaration): boolean;
+        isOptionalUninitializedParameterProperty(node: ParameterDeclaration): boolean;
+        createTypeOfDeclaration(declaration: AccessorDeclaration | VariableLikeDeclaration, enclosingDeclaration: Node, flags: NodeBuilderFlags, tracker: SymbolTracker, addUndefined?: boolean): TypeNode | undefined;
+        createReturnTypeOfSignatureDeclaration(signatureDeclaration: SignatureDeclaration, enclosingDeclaration: Node, flags: NodeBuilderFlags, tracker: SymbolTracker): TypeNode | undefined;
+        createTypeOfExpression(expr: Expression, enclosingDeclaration: Node, flags: NodeBuilderFlags, tracker: SymbolTracker): TypeNode | undefined;
+        createLiteralConstValue(node: VariableDeclaration | PropertyDeclaration | PropertySignature | ParameterDeclaration): Expression;
+        isSymbolAccessible(symbol: Symbol, enclosingDeclaration: Node | undefined, meaning: SymbolFlags | undefined, shouldComputeAliasToMarkVisible: boolean): SymbolAccessibilityResult;
+        isEntityNameVisible(entityName: EntityNameOrEntityNameExpression, enclosingDeclaration: Node): SymbolVisibilityResult;
+        getConstantValue(node: EnumMember | PropertyAccessExpression | ElementAccessExpression): string | number | undefined;
+        getReferencedValueDeclaration(reference: Identifier): Declaration | undefined;
+        getTypeReferenceSerializationKind(typeName: EntityName, location?: Node): TypeReferenceSerializationKind;
+        isOptionalParameter(node: ParameterDeclaration): boolean;
+        moduleExportsSomeValue(moduleReferenceExpression: Expression): boolean;
+        isArgumentsLocalBinding(node: Identifier): boolean;
+        getExternalModuleFileFromDeclaration(declaration: ImportEqualsDeclaration | ImportDeclaration | ExportDeclaration | ModuleDeclaration | ImportTypeNode): SourceFile | undefined;
+        getTypeReferenceDirectivesForEntityName(name: EntityNameOrEntityNameExpression): string[] | undefined;
+        getTypeReferenceDirectivesForSymbol(symbol: Symbol, meaning?: SymbolFlags): string[] | undefined;
+        isLiteralConstDeclaration(node: VariableDeclaration | PropertyDeclaration | PropertySignature | ParameterDeclaration): boolean;
+        getJsxFactoryEntity(location?: Node): EntityName | undefined;
+        getAllAccessorDeclarations(declaration: AccessorDeclaration): AllAccessorDeclarations;
+    }
+    enum SymbolFlags {
+        None = 0,
+        FunctionScopedVariable = 1,
+        BlockScopedVariable = 2,
+        Property = 4,
+        EnumMember = 8,
+        Function = 16,
+        Class = 32,
+        Interface = 64,
+        ConstEnum = 128,
+        RegularEnum = 256,
+        ValueModule = 512,
+        NamespaceModule = 1024,
+        TypeLiteral = 2048,
+        ObjectLiteral = 4096,
+        Method = 8192,
+        Constructor = 16384,
+        GetAccessor = 32768,
+        SetAccessor = 65536,
+        Signature = 131072,
+        TypeParameter = 262144,
+        TypeAlias = 524288,
+        ExportValue = 1048576,
+        Alias = 2097152,
+        Prototype = 4194304,
+        ExportStar = 8388608,
+        Optional = 16777216,
+        Transient = 33554432,
+        JSContainer = 67108864,
+        All = 67108863,
+        Enum = 384,
+        Variable = 3,
+        Value = 67216319,
+        Type = 67901928,
+        Namespace = 1920,
+        Module = 1536,
+        Accessor = 98304,
+        FunctionScopedVariableExcludes = 67216318,
+        BlockScopedVariableExcludes = 67216319,
+        ParameterExcludes = 67216319,
+        PropertyExcludes = 0,
+        EnumMemberExcludes = 68008959,
+        FunctionExcludes = 67215791,
+        ClassExcludes = 68008383,
+        InterfaceExcludes = 67901832,
+        RegularEnumExcludes = 68008191,
+        ConstEnumExcludes = 68008831,
+        ValueModuleExcludes = 67215503,
+        NamespaceModuleExcludes = 0,
+        MethodExcludes = 67208127,
+        GetAccessorExcludes = 67150783,
+        SetAccessorExcludes = 67183551,
+        TypeParameterExcludes = 67639784,
+        TypeAliasExcludes = 67901928,
+        AliasExcludes = 2097152,
+        ModuleMember = 2623475,
+        ExportHasLocal = 944,
+        HasExports = 1952,
+        HasMembers = 6240,
+        BlockScoped = 418,
+        PropertyOrAccessor = 98308,
+        ClassMember = 106500,
+        Classifiable = 2885600,
+        LateBindingContainer = 6240
+    }
+    interface Symbol {
+        flags: SymbolFlags;
+        escapedName: __String;
+        declarations: Declaration[];
+        valueDeclaration: Declaration;
+        members?: SymbolTable;
+        exports?: SymbolTable;
+        globalExports?: SymbolTable;
+        id?: number;
+        mergeId?: number;
+        parent?: Symbol;
+        exportSymbol?: Symbol;
+        nameType?: Type;
+        constEnumOnlyModule?: boolean;
+        isReferenced?: SymbolFlags;
+        isReplaceableByMethod?: boolean;
+        isAssigned?: boolean;
+    }
+    interface SymbolLinks {
+        immediateTarget?: Symbol;
+        target?: Symbol;
+        type?: Type;
+        uniqueESSymbolType?: Type;
+        declaredType?: Type;
+        typeParameters?: TypeParameter[];
+        outerTypeParameters?: TypeParameter[];
+        inferredClassType?: Type;
+        instantiations?: Map<Type>;
+        mapper?: TypeMapper;
+        referenced?: boolean;
+        containingType?: UnionOrIntersectionType;
+        leftSpread?: Symbol;
+        rightSpread?: Symbol;
+        syntheticOrigin?: Symbol;
+        isDiscriminantProperty?: boolean;
+        resolvedExports?: SymbolTable;
+        resolvedMembers?: SymbolTable;
+        exportsChecked?: boolean;
+        typeParametersChecked?: boolean;
+        isDeclarationWithCollidingName?: boolean;
+        bindingElement?: BindingElement;
+        exportsSomeValue?: boolean;
+        enumKind?: EnumKind;
+        originatingImport?: ImportDeclaration | ImportCall;
+        lateSymbol?: Symbol;
+    }
+    enum EnumKind {
+        Numeric = 0,
+        Literal = 1
+    }
+    enum CheckFlags {
+        Instantiated = 1,
+        SyntheticProperty = 2,
+        SyntheticMethod = 4,
+        Readonly = 8,
+        Partial = 16,
+        HasNonUniformType = 32,
+        ContainsPublic = 64,
+        ContainsProtected = 128,
+        ContainsPrivate = 256,
+        ContainsStatic = 512,
+        Late = 1024,
+        ReverseMapped = 2048,
+        Synthetic = 6
+    }
+    interface TransientSymbol extends Symbol, SymbolLinks {
+        checkFlags: CheckFlags;
+        isRestParameter?: boolean;
+    }
+    interface ReverseMappedSymbol extends TransientSymbol {
+        propertyType: Type;
+        mappedType: MappedType;
+    }
+    enum InternalSymbolName {
+        Call = "__call",
+        Constructor = "__constructor",
+        New = "__new",
+        Index = "__index",
+        ExportStar = "__export",
+        Global = "__global",
+        Missing = "__missing",
+        Type = "__type",
+        Object = "__object",
+        JSXAttributes = "__jsxAttributes",
+        Class = "__class",
+        Function = "__function",
+        Computed = "__computed",
+        Resolving = "__resolving__",
+        ExportEquals = "export=",
+        Default = "default"
+    }
+    /**
+     * This represents a string whose leading underscore have been escaped by adding extra leading underscores.
+     * The shape of this brand is rather unique compared to others we've used.
+     * Instead of just an intersection of a string and an object, it is that union-ed
+     * with an intersection of void and an object. This makes it wholly incompatible
+     * with a normal string (which is good, it cannot be misused on assignment or on usage),
+     * while still being comparable with a normal string via === (also good) and castable from a string.
+     */
+    type __String = (string & {
+        __escapedIdentifier: void;
+    }) | (void & {
+        __escapedIdentifier: void;
+    }) | InternalSymbolName;
+    /** ReadonlyMap where keys are `__String`s. */
+    interface ReadonlyUnderscoreEscapedMap<T> {
+        get(key: __String): T | undefined;
+        has(key: __String): boolean;
+        forEach(action: (value: T, key: __String) => void): void;
+        readonly size: number;
+        keys(): Iterator<__String>;
+        values(): Iterator<T>;
+        entries(): Iterator<[__String, T]>;
+    }
+    /** Map where keys are `__String`s. */
+    interface UnderscoreEscapedMap<T> extends ReadonlyUnderscoreEscapedMap<T> {
+        set(key: __String, value: T): this;
+        delete(key: __String): boolean;
+        clear(): void;
+    }
+    /** SymbolTable based on ES6 Map interface. */
+    type SymbolTable = UnderscoreEscapedMap<Symbol>;
+    /** Used to track a `declare module "foo*"`-like declaration. */
+    interface PatternAmbientModule {
+        pattern: Pattern;
+        symbol: Symbol;
+    }
+    enum NodeCheckFlags {
+        TypeChecked = 1,
+        LexicalThis = 2,
+        CaptureThis = 4,
+        CaptureNewTarget = 8,
+        SuperInstance = 256,
+        SuperStatic = 512,
+        ContextChecked = 1024,
+        AsyncMethodWithSuper = 2048,
+        AsyncMethodWithSuperBinding = 4096,
+        CaptureArguments = 8192,
+        EnumValuesComputed = 16384,
+        LexicalModuleMergesWithClass = 32768,
+        LoopWithCapturedBlockScopedBinding = 65536,
+        CapturedBlockScopedBinding = 131072,
+        BlockScopedBindingInLoop = 262144,
+        ClassWithBodyScopedClassBinding = 524288,
+        BodyScopedClassBinding = 1048576,
+        NeedsLoopOutParameter = 2097152,
+        AssignmentsMarked = 4194304,
+        ClassWithConstructorReference = 8388608,
+        ConstructorReferenceInClass = 16777216
+    }
+    interface NodeLinks {
+        flags: NodeCheckFlags;
+        resolvedType?: Type;
+        resolvedSignature?: Signature;
+        resolvedSignatures?: Map<Signature[]>;
+        resolvedSymbol?: Symbol;
+        resolvedIndexInfo?: IndexInfo;
+        maybeTypePredicate?: boolean;
+        enumMemberValue?: string | number;
+        isVisible?: boolean;
+        containsArgumentsReference?: boolean;
+        hasReportedStatementInAmbientContext?: boolean;
+        jsxFlags: JsxFlags;
+        resolvedJsxElementAttributesType?: Type;
+        resolvedJsxElementAllAttributesType?: Type;
+        hasSuperCall?: boolean;
+        superCall?: SuperCall;
+        switchTypes?: Type[];
+    }
+    enum TypeFlags {
+        Any = 1,
+        Unknown = 2,
+        String = 4,
+        Number = 8,
+        Boolean = 16,
+        Enum = 32,
+        StringLiteral = 64,
+        NumberLiteral = 128,
+        BooleanLiteral = 256,
+        EnumLiteral = 512,
+        ESSymbol = 1024,
+        UniqueESSymbol = 2048,
+        Void = 4096,
+        Undefined = 8192,
+        Null = 16384,
+        Never = 32768,
+        TypeParameter = 65536,
+        Object = 131072,
+        Union = 262144,
+        Intersection = 524288,
+        Index = 1048576,
+        IndexedAccess = 2097152,
+        Conditional = 4194304,
+        Substitution = 8388608,
+        NonPrimitive = 16777216,
+        FreshLiteral = 33554432,
+        UnionOfUnitTypes = 67108864,
+        ContainsWideningType = 134217728,
+        ContainsObjectLiteral = 268435456,
+        ContainsAnyFunctionType = 536870912,
+        AnyOrUnknown = 3,
+        Nullable = 24576,
+        Literal = 448,
+        Unit = 27072,
+        StringOrNumberLiteral = 192,
+        StringOrNumberLiteralOrUnique = 2240,
+        DefinitelyFalsy = 29120,
+        PossiblyFalsy = 29148,
+        Intrinsic = 16839967,
+        Primitive = 32764,
+        StringLike = 68,
+        NumberLike = 168,
+        BooleanLike = 272,
+        EnumLike = 544,
+        ESSymbolLike = 3072,
+        VoidLike = 12288,
+        DisjointDomains = 16809468,
+        UnionOrIntersection = 786432,
+        StructuredType = 917504,
+        TypeVariable = 2162688,
+        InstantiableNonPrimitive = 14745600,
+        InstantiablePrimitive = 1048576,
+        Instantiable = 15794176,
+        StructuredOrInstantiable = 16711680,
+        Narrowable = 33492479,
+        NotUnionOrUnit = 16909315,
+        NotUnit = 16749629,
+        RequiresWidening = 402653184,
+        PropagatingFlags = 939524096,
+        NonWideningType = 134217728,
+        Wildcard = 268435456,
+        EmptyObject = 536870912,
+        ConstructionFlags = 939524096,
+        GenericMappedType = 134217728
+    }
+    type DestructuringPattern = BindingPattern | ObjectLiteralExpression | ArrayLiteralExpression;
+    interface Type {
+        flags: TypeFlags;
+        id: number;
+        checker: TypeChecker;
+        symbol: Symbol;
+        pattern?: DestructuringPattern;
+        aliasSymbol?: Symbol;
+        aliasTypeArguments?: Type[];
+        wildcardInstantiation?: Type;
+    }
+    interface IntrinsicType extends Type {
+        intrinsicName: string;
+    }
+    interface LiteralType extends Type {
+        value: string | number;
+        freshType: LiteralType;
+        regularType: LiteralType;
+    }
+    interface UniqueESSymbolType extends Type {
+        symbol: Symbol;
+    }
+    interface StringLiteralType extends LiteralType {
+        value: string;
+    }
+    interface NumberLiteralType extends LiteralType {
+        value: number;
+    }
+    interface EnumType extends Type {
+    }
+    enum ObjectFlags {
+        Class = 1,
+        Interface = 2,
+        Reference = 4,
+        Tuple = 8,
+        Anonymous = 16,
+        Mapped = 32,
+        Instantiated = 64,
+        ObjectLiteral = 128,
+        EvolvingArray = 256,
+        ObjectLiteralPatternWithComputedProperties = 512,
+        ContainsSpread = 1024,
+        ReverseMapped = 2048,
+        JsxAttributes = 4096,
+        MarkerType = 8192,
+        ClassOrInterface = 3
+    }
+    interface ObjectType extends Type {
+        objectFlags: ObjectFlags;
+    }
+    /** Class and interface types (ObjectFlags.Class and ObjectFlags.Interface). */
+    interface InterfaceType extends ObjectType {
+        typeParameters: TypeParameter[] | undefined;
+        outerTypeParameters: TypeParameter[] | undefined;
+        localTypeParameters: TypeParameter[] | undefined;
+        thisType: TypeParameter | undefined;
+        resolvedBaseConstructorType?: Type;
+        resolvedBaseTypes: BaseType[];
+    }
+    type BaseType = ObjectType | IntersectionType;
+    interface InterfaceTypeWithDeclaredMembers extends InterfaceType {
+        declaredProperties: Symbol[];
+        declaredCallSignatures: Signature[];
+        declaredConstructSignatures: Signature[];
+        declaredStringIndexInfo?: IndexInfo;
+        declaredNumberIndexInfo?: IndexInfo;
+    }
+    /**
+     * Type references (ObjectFlags.Reference). When a class or interface has type parameters or
+     * a "this" type, references to the class or interface are made using type references. The
+     * typeArguments property specifies the types to substitute for the type parameters of the
+     * class or interface and optionally includes an extra element that specifies the type to
+     * substitute for "this" in the resulting instantiation. When no extra argument is present,
+     * the type reference itself is substituted for "this". The typeArguments property is undefined
+     * if the class or interface has no type parameters and the reference isn't specifying an
+     * explicit "this" argument.
+     */
+    interface TypeReference extends ObjectType {
+        target: GenericType;
+        typeArguments?: Type[];
+    }
+    enum Variance {
+        Invariant = 0,
+        Covariant = 1,
+        Contravariant = 2,
+        Bivariant = 3,
+        Independent = 4
+    }
+    interface GenericType extends InterfaceType, TypeReference {
+        instantiations: Map<TypeReference>;
+        variances?: Variance[];
+    }
+    interface UnionOrIntersectionType extends Type {
+        types: Type[];
+        propertyCache: SymbolTable;
+        resolvedProperties: Symbol[];
+        resolvedIndexType: IndexType;
+        resolvedStringIndexType: IndexType;
+        resolvedBaseConstraint: Type;
+        couldContainTypeVariables: boolean;
+    }
+    interface UnionType extends UnionOrIntersectionType {
+    }
+    interface IntersectionType extends UnionOrIntersectionType {
+        resolvedApparentType: Type;
+    }
+    type StructuredType = ObjectType | UnionType | IntersectionType;
+    interface AnonymousType extends ObjectType {
+        target?: AnonymousType;
+        mapper?: TypeMapper;
+    }
+    interface MappedType extends AnonymousType {
+        declaration: MappedTypeNode;
+        typeParameter?: TypeParameter;
+        constraintType?: Type;
+        templateType?: Type;
+        modifiersType?: Type;
+    }
+    interface EvolvingArrayType extends ObjectType {
+        elementType: Type;
+        finalArrayType?: Type;
+    }
+    interface ReverseMappedType extends ObjectType {
+        source: Type;
+        mappedType: MappedType;
+    }
+    interface ResolvedType extends ObjectType, UnionOrIntersectionType {
+        members: SymbolTable;
+        properties: Symbol[];
+        callSignatures: Signature[];
+        constructSignatures: Signature[];
+        stringIndexInfo?: IndexInfo;
+        numberIndexInfo?: IndexInfo;
+    }
+    interface FreshObjectLiteralType extends ResolvedType {
+        regularType: ResolvedType;
+    }
+    interface IterableOrIteratorType extends ObjectType, UnionType {
+        iteratedTypeOfIterable?: Type;
+        iteratedTypeOfIterator?: Type;
+        iteratedTypeOfAsyncIterable?: Type;
+        iteratedTypeOfAsyncIterator?: Type;
+    }
+    interface PromiseOrAwaitableType extends ObjectType, UnionType {
+        promiseTypeOfPromiseConstructor?: Type;
+        promisedTypeOfPromise?: Type;
+        awaitedTypeOfType?: Type;
+    }
+    interface SyntheticDefaultModuleType extends Type {
+        syntheticType?: Type;
+    }
+    interface InstantiableType extends Type {
+        resolvedBaseConstraint?: Type;
+        resolvedIndexType?: IndexType;
+        resolvedStringIndexType?: IndexType;
+    }
+    interface TypeParameter extends InstantiableType {
+        /** Retrieve using getConstraintFromTypeParameter */
+        constraint?: Type;
+        default?: Type;
+        target?: TypeParameter;
+        mapper?: TypeMapper;
+        isThisType?: boolean;
+        resolvedDefaultType?: Type;
+    }
+    interface IndexedAccessType extends InstantiableType {
+        objectType: Type;
+        indexType: Type;
+        constraint?: Type;
+        simplified?: Type;
+    }
+    type TypeVariable = TypeParameter | IndexedAccessType;
+    interface IndexType extends InstantiableType {
+        type: InstantiableType | UnionOrIntersectionType;
+        stringsOnly: boolean;
+    }
+    interface ConditionalRoot {
+        node: ConditionalTypeNode;
+        checkType: Type;
+        extendsType: Type;
+        trueType: Type;
+        falseType: Type;
+        isDistributive: boolean;
+        inferTypeParameters?: TypeParameter[];
+        outerTypeParameters?: TypeParameter[];
+        instantiations?: Map<Type>;
+        aliasSymbol?: Symbol;
+        aliasTypeArguments?: Type[];
+    }
+    interface ConditionalType extends InstantiableType {
+        root: ConditionalRoot;
+        checkType: Type;
+        extendsType: Type;
+        resolvedTrueType?: Type;
+        resolvedFalseType?: Type;
+        resolvedDefaultConstraint?: Type;
+        mapper?: TypeMapper;
+        combinedMapper?: TypeMapper;
+    }
+    interface SubstitutionType extends InstantiableType {
+        typeVariable: TypeVariable;
+        substitute: Type;
+    }
+    enum SignatureKind {
+        Call = 0,
+        Construct = 1
+    }
+    interface Signature {
+        declaration?: SignatureDeclaration | JSDocSignature;
+        typeParameters?: TypeParameter[];
+        parameters: Symbol[];
+        thisParameter?: Symbol;
+        resolvedReturnType?: Type;
+        resolvedTypePredicate?: TypePredicate;
+        minArgumentCount: number;
+        hasRestParameter: boolean;
+        hasLiteralTypes: boolean;
+        target?: Signature;
+        mapper?: TypeMapper;
+        unionSignatures?: Signature[];
+        erasedSignatureCache?: Signature;
+        canonicalSignatureCache?: Signature;
+        isolatedSignatureType?: ObjectType;
+        instantiations?: Map<Signature>;
+    }
+    enum IndexKind {
+        String = 0,
+        Number = 1
+    }
+    interface IndexInfo {
+        type: Type;
+        isReadonly: boolean;
+        declaration?: IndexSignatureDeclaration;
+    }
+    type TypeMapper = (t: TypeParameter) => Type;
+    enum InferencePriority {
+        NakedTypeVariable = 1,
+        HomomorphicMappedType = 2,
+        MappedTypeConstraint = 4,
+        ReturnType = 8,
+        LiteralKeyof = 16,
+        NoConstraints = 32,
+        AlwaysStrict = 64,
+        PriorityImpliesCombination = 28
+    }
+    interface InferenceInfo {
+        typeParameter: TypeParameter;
+        candidates: Type[] | undefined;
+        contraCandidates: Type[] | undefined;
+        inferredType?: Type;
+        priority?: InferencePriority;
+        topLevel: boolean;
+        isFixed: boolean;
+    }
+    enum InferenceFlags {
+        None = 0,
+        InferUnionTypes = 1,
+        NoDefault = 2,
+        AnyDefault = 4
+    }
+    /**
+     * Ternary values are defined such that
+     * x & y is False if either x or y is False.
+     * x & y is Maybe if either x or y is Maybe, but neither x or y is False.
+     * x & y is True if both x and y are True.
+     * x | y is False if both x and y are False.
+     * x | y is Maybe if either x or y is Maybe, but neither x or y is True.
+     * x | y is True if either x or y is True.
+     */
+    enum Ternary {
+        False = 0,
+        Maybe = 1,
+        True = -1
+    }
+    type TypeComparer = (s: Type, t: Type, reportErrors?: boolean) => Ternary;
+    interface InferenceContext extends TypeMapper {
+        typeParameters: TypeParameter[];
+        signature?: Signature;
+        inferences: InferenceInfo[];
+        flags: InferenceFlags;
+        compareTypes: TypeComparer;
+    }
+    interface WideningContext {
+        parent?: WideningContext;
+        propertyName?: __String;
+        siblings?: Type[];
+        resolvedProperties?: Symbol[];
+    }
+    enum SpecialPropertyAssignmentKind {
+        None = 0,
+        ExportsProperty = 1,
+        ModuleExports = 2,
+        PrototypeProperty = 3,
+        ThisProperty = 4,
+        Property = 5,
+        Prototype = 6
+    }
+    /** @deprecated Use FileExtensionInfo instead. */
+    type JsFileExtensionInfo = FileExtensionInfo;
+    interface FileExtensionInfo {
+        extension: string;
+        isMixedContent: boolean;
+        scriptKind?: ScriptKind;
+    }
+    interface DiagnosticMessage {
+        key: string;
+        category: DiagnosticCategory;
+        code: number;
+        message: string;
+        reportsUnnecessary?: {};
+    }
+    /**
+     * A linked list of formatted diagnostic messages to be used as part of a multiline message.
+     * It is built from the bottom up, leaving the head to be the "main" diagnostic.
+     * While it seems that DiagnosticMessageChain is structurally similar to DiagnosticMessage,
+     * the difference is that messages are all preformatted in DMC.
+     */
+    interface DiagnosticMessageChain {
+        messageText: string;
+        category: DiagnosticCategory;
+        code: number;
+        next?: DiagnosticMessageChain;
+    }
+    interface Diagnostic {
+        file: SourceFile | undefined;
+        start: number | undefined;
+        length: number | undefined;
+        messageText: string | DiagnosticMessageChain;
+        category: DiagnosticCategory;
+        /** May store more in future. For now, this will simply be `true` to indicate when a diagnostic is an unused-identifier diagnostic. */
+        reportsUnnecessary?: {};
+        code: number;
+        source?: string;
+    }
+    interface DiagnosticWithLocation extends Diagnostic {
+        file: SourceFile;
+        start: number;
+        length: number;
+    }
+    enum DiagnosticCategory {
+        Warning = 0,
+        Error = 1,
+        Suggestion = 2,
+        Message = 3
+    }
+    function diagnosticCategoryName(d: {
+        category: DiagnosticCategory;
+    }, lowerCase?: boolean): string;
+    enum ModuleResolutionKind {
+        Classic = 1,
+        NodeJs = 2
+    }
+    interface PluginImport {
+        name: string;
+    }
+    interface ProjectReference {
+        /** A normalized path on disk */
+        path: string;
+        /** The path as the user originally wrote it */
+        originalPath?: string;
+        /** True if the output of this reference should be prepended to the output of this project. Only valid for --outFile compilations */
+        prepend?: boolean;
+        /** True if it is intended that this reference form a circularity */
+        circular?: boolean;
+    }
+    type CompilerOptionsValue = string | number | boolean | (string | number)[] | string[] | MapLike<string[]> | PluginImport[] | ProjectReference[] | null | undefined;
+    interface CompilerOptions {
+        all?: boolean;
+        allowJs?: boolean;
+        allowNonTsExtensions?: boolean;
+        allowSyntheticDefaultImports?: boolean;
+        allowUnreachableCode?: boolean;
+        allowUnusedLabels?: boolean;
+        alwaysStrict?: boolean;
+        baseUrl?: string;
+        /** An error if set - this should only go through the -b pipeline and not actually be observed */
+        build?: boolean;
+        charset?: string;
+        checkJs?: boolean;
+        configFilePath?: string;
+        /** configFile is set as non enumerable property so as to avoid checking of json source files */
+        readonly configFile?: TsConfigSourceFile;
+        declaration?: boolean;
+        declarationMap?: boolean;
+        emitDeclarationOnly?: boolean;
+        declarationDir?: string;
+        diagnostics?: boolean;
+        extendedDiagnostics?: boolean;
+        disableSizeLimit?: boolean;
+        downlevelIteration?: boolean;
+        emitBOM?: boolean;
+        emitDecoratorMetadata?: boolean;
+        experimentalDecorators?: boolean;
+        forceConsistentCasingInFileNames?: boolean;
+        help?: boolean;
+        importHelpers?: boolean;
+        init?: boolean;
+        inlineSourceMap?: boolean;
+        inlineSources?: boolean;
+        isolatedModules?: boolean;
+        jsx?: JsxEmit;
+        keyofStringsOnly?: boolean;
+        lib?: string[];
+        listEmittedFiles?: boolean;
+        listFiles?: boolean;
+        locale?: string;
+        mapRoot?: string;
+        maxNodeModuleJsDepth?: number;
+        module?: ModuleKind;
+        moduleResolution?: ModuleResolutionKind;
+        newLine?: NewLineKind;
+        noEmit?: boolean;
+        noEmitForJsFiles?: boolean;
+        noEmitHelpers?: boolean;
+        noEmitOnError?: boolean;
+        noErrorTruncation?: boolean;
+        noFallthroughCasesInSwitch?: boolean;
+        noImplicitAny?: boolean;
+        noImplicitReturns?: boolean;
+        noImplicitThis?: boolean;
+        noStrictGenericChecks?: boolean;
+        noUnusedLocals?: boolean;
+        noUnusedParameters?: boolean;
+        noImplicitUseStrict?: boolean;
+        noLib?: boolean;
+        noResolve?: boolean;
+        out?: string;
+        outDir?: string;
+        outFile?: string;
+        paths?: MapLike<string[]>;
+        plugins?: PluginImport[];
+        preserveConstEnums?: boolean;
+        preserveSymlinks?: boolean;
+        preserveWatchOutput?: boolean;
+        project?: string;
+        pretty?: boolean;
+        reactNamespace?: string;
+        jsxFactory?: string;
+        composite?: boolean;
+        removeComments?: boolean;
+        rootDir?: string;
+        rootDirs?: string[];
+        skipLibCheck?: boolean;
+        skipDefaultLibCheck?: boolean;
+        sourceMap?: boolean;
+        sourceRoot?: string;
+        strict?: boolean;
+        strictFunctionTypes?: boolean;
+        strictNullChecks?: boolean;
+        strictPropertyInitialization?: boolean;
+        stripInternal?: boolean;
+        suppressExcessPropertyErrors?: boolean;
+        suppressImplicitAnyIndexErrors?: boolean;
+        suppressOutputPathCheck?: boolean;
+        target?: ScriptTarget;
+        traceResolution?: boolean;
+        resolveJsonModule?: boolean;
+        types?: string[];
+        /** Paths used to compute primary types search locations */
+        typeRoots?: string[];
+        version?: boolean;
+        watch?: boolean;
+        esModuleInterop?: boolean;
+        [option: string]: CompilerOptionsValue | TsConfigSourceFile | undefined;
+    }
+    interface TypeAcquisition {
+        enableAutoDiscovery?: boolean;
+        enable?: boolean;
+        include?: string[];
+        exclude?: string[];
+        [option: string]: string[] | boolean | undefined;
+    }
+    enum ModuleKind {
+        None = 0,
+        CommonJS = 1,
+        AMD = 2,
+        UMD = 3,
+        System = 4,
+        ES2015 = 5,
+        ESNext = 6
+    }
+    enum JsxEmit {
+        None = 0,
+        Preserve = 1,
+        React = 2,
+        ReactNative = 3
+    }
+    enum NewLineKind {
+        CarriageReturnLineFeed = 0,
+        LineFeed = 1
+    }
+    interface LineAndCharacter {
+        /** 0-based. */
+        line: number;
+        character: number;
+    }
+    enum ScriptKind {
+        Unknown = 0,
+        JS = 1,
+        JSX = 2,
+        TS = 3,
+        TSX = 4,
+        External = 5,
+        JSON = 6,
+        /**
+         * Used on extensions that doesn't define the ScriptKind but the content defines it.
+         * Deferred extensions are going to be included in all project contexts.
+         */
+        Deferred = 7
+    }
+    enum ScriptTarget {
+        ES3 = 0,
+        ES5 = 1,
+        ES2015 = 2,
+        ES2016 = 3,
+        ES2017 = 4,
+        ES2018 = 5,
+        ESNext = 6,
+        JSON = 100,
+        Latest = 6
+    }
+    enum LanguageVariant {
+        Standard = 0,
+        JSX = 1
+    }
+    /** Either a parsed command line or a parsed tsconfig.json */
+    interface ParsedCommandLine {
+        options: CompilerOptions;
+        typeAcquisition?: TypeAcquisition;
+        fileNames: string[];
+        projectReferences?: ReadonlyArray<ProjectReference>;
+        raw?: any;
+        errors: Diagnostic[];
+        wildcardDirectories?: MapLike<WatchDirectoryFlags>;
+        compileOnSave?: boolean;
+        configFileSpecs?: ConfigFileSpecs;
+    }
+    enum WatchDirectoryFlags {
+        None = 0,
+        Recursive = 1
+    }
+    interface ConfigFileSpecs {
+        filesSpecs: ReadonlyArray<string> | undefined;
+        referencesSpecs: ReadonlyArray<ProjectReference> | undefined;
+        /**
+         * Present to report errors (user specified specs), validatedIncludeSpecs are used for file name matching
+         */
+        includeSpecs?: ReadonlyArray<string>;
+        /**
+         * Present to report errors (user specified specs), validatedExcludeSpecs are used for file name matching
+         */
+        excludeSpecs?: ReadonlyArray<string>;
+        validatedIncludeSpecs?: ReadonlyArray<string>;
+        validatedExcludeSpecs?: ReadonlyArray<string>;
+        wildcardDirectories: MapLike<WatchDirectoryFlags>;
+    }
+    interface ExpandResult {
+        fileNames: string[];
+        projectReferences: ReadonlyArray<ProjectReference> | undefined;
+        wildcardDirectories: MapLike<WatchDirectoryFlags>;
+        spec: ConfigFileSpecs;
+    }
+    interface CreateProgramOptions {
+        rootNames: ReadonlyArray<string>;
+        options: CompilerOptions;
+        projectReferences?: ReadonlyArray<ProjectReference>;
+        host?: CompilerHost;
+        oldProgram?: Program;
+        configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>;
+    }
+    interface CommandLineOptionBase {
+        name: string;
+        type: "string" | "number" | "boolean" | "object" | "list" | Map<number | string>;
+        isFilePath?: boolean;
+        shortName?: string;
+        description?: DiagnosticMessage;
+        paramType?: DiagnosticMessage;
+        isTSConfigOnly?: boolean;
+        isCommandLineOnly?: boolean;
+        showInSimplifiedHelpView?: boolean;
+        category?: DiagnosticMessage;
+    }
+    interface CommandLineOptionOfPrimitiveType extends CommandLineOptionBase {
+        type: "string" | "number" | "boolean";
+    }
+    interface CommandLineOptionOfCustomType extends CommandLineOptionBase {
+        type: Map<number | string>;
+    }
+    interface TsConfigOnlyOption extends CommandLineOptionBase {
+        type: "object";
+        elementOptions?: Map<CommandLineOption>;
+        extraKeyDiagnosticMessage?: DiagnosticMessage;
+    }
+    interface CommandLineOptionOfListType extends CommandLineOptionBase {
+        type: "list";
+        element: CommandLineOptionOfCustomType | CommandLineOptionOfPrimitiveType | TsConfigOnlyOption;
+    }
+    type CommandLineOption = CommandLineOptionOfCustomType | CommandLineOptionOfPrimitiveType | TsConfigOnlyOption | CommandLineOptionOfListType;
+    enum CharacterCodes {
+        nullCharacter = 0,
+        maxAsciiCharacter = 127,
+        lineFeed = 10,
+        carriageReturn = 13,
+        lineSeparator = 8232,
+        paragraphSeparator = 8233,
+        nextLine = 133,
+        space = 32,
+        nonBreakingSpace = 160,
+        enQuad = 8192,
+        emQuad = 8193,
+        enSpace = 8194,
+        emSpace = 8195,
+        threePerEmSpace = 8196,
+        fourPerEmSpace = 8197,
+        sixPerEmSpace = 8198,
+        figureSpace = 8199,
+        punctuationSpace = 8200,
+        thinSpace = 8201,
+        hairSpace = 8202,
+        zeroWidthSpace = 8203,
+        narrowNoBreakSpace = 8239,
+        ideographicSpace = 12288,
+        mathematicalSpace = 8287,
+        ogham = 5760,
+        _ = 95,
+        $ = 36,
+        _0 = 48,
+        _1 = 49,
+        _2 = 50,
+        _3 = 51,
+        _4 = 52,
+        _5 = 53,
+        _6 = 54,
+        _7 = 55,
+        _8 = 56,
+        _9 = 57,
+        a = 97,
+        b = 98,
+        c = 99,
+        d = 100,
+        e = 101,
+        f = 102,
+        g = 103,
+        h = 104,
+        i = 105,
+        j = 106,
+        k = 107,
+        l = 108,
+        m = 109,
+        n = 110,
+        o = 111,
+        p = 112,
+        q = 113,
+        r = 114,
+        s = 115,
+        t = 116,
+        u = 117,
+        v = 118,
+        w = 119,
+        x = 120,
+        y = 121,
+        z = 122,
+        A = 65,
+        B = 66,
+        C = 67,
+        D = 68,
+        E = 69,
+        F = 70,
+        G = 71,
+        H = 72,
+        I = 73,
+        J = 74,
+        K = 75,
+        L = 76,
+        M = 77,
+        N = 78,
+        O = 79,
+        P = 80,
+        Q = 81,
+        R = 82,
+        S = 83,
+        T = 84,
+        U = 85,
+        V = 86,
+        W = 87,
+        X = 88,
+        Y = 89,
+        Z = 90,
+        ampersand = 38,
+        asterisk = 42,
+        at = 64,
+        backslash = 92,
+        backtick = 96,
+        bar = 124,
+        caret = 94,
+        closeBrace = 125,
+        closeBracket = 93,
+        closeParen = 41,
+        colon = 58,
+        comma = 44,
+        dot = 46,
+        doubleQuote = 34,
+        equals = 61,
+        exclamation = 33,
+        greaterThan = 62,
+        hash = 35,
+        lessThan = 60,
+        minus = 45,
+        openBrace = 123,
+        openBracket = 91,
+        openParen = 40,
+        percent = 37,
+        plus = 43,
+        question = 63,
+        semicolon = 59,
+        singleQuote = 39,
+        slash = 47,
+        tilde = 126,
+        backspace = 8,
+        formFeed = 12,
+        byteOrderMark = 65279,
+        tab = 9,
+        verticalTab = 11
+    }
+    interface ModuleResolutionHost {
+        fileExists(fileName: string): boolean;
+        readFile(fileName: string): string | undefined;
+        trace?(s: string): void;
+        directoryExists?(directoryName: string): boolean;
+        /**
+         * Resolve a symbolic link.
+         * @see https://nodejs.org/api/fs.html#fs_fs_realpathsync_path_options
+         */
+        realpath?(path: string): string;
+        getCurrentDirectory?(): string;
+        getDirectories?(path: string): string[];
+    }
+    /**
+     * Represents the result of module resolution.
+     * Module resolution will pick up tsx/jsx/js files even if '--jsx' and '--allowJs' are turned off.
+     * The Program will then filter results based on these flags.
+     *
+     * Prefer to return a `ResolvedModuleFull` so that the file type does not have to be inferred.
+     */
+    interface ResolvedModule {
+        /** Path of the file the module was resolved to. */
+        resolvedFileName: string;
+        /** True if `resolvedFileName` comes from `node_modules`. */
+        isExternalLibraryImport?: boolean;
+    }
+    /**
+     * ResolvedModule with an explicitly provided `extension` property.
+     * Prefer this over `ResolvedModule`.
+     * If changing this, remember to change `moduleResolutionIsEqualTo`.
+     */
+    interface ResolvedModuleFull extends ResolvedModule {
+        readonly originalPath?: string;
+        /**
+         * Extension of resolvedFileName. This must match what's at the end of resolvedFileName.
+         * This is optional for backwards-compatibility, but will be added if not provided.
+         */
+        extension: Extension;
+        packageId?: PackageId;
+    }
+    /**
+     * Unique identifier with a package name and version.
+     * If changing this, remember to change `packageIdIsEqual`.
+     */
+    interface PackageId {
+        /**
+         * Name of the package.
+         * Should not include `@types`.
+         * If accessing a non-index file, this should include its name e.g. "foo/bar".
+         */
+        name: string;
+        /**
+         * Name of a submodule within this package.
+         * May be "".
+         */
+        subModuleName: string;
+        /** Version of the package, e.g. "1.2.3" */
+        version: string;
+    }
+    enum Extension {
+        Ts = ".ts",
+        Tsx = ".tsx",
+        Dts = ".d.ts",
+        Js = ".js",
+        Jsx = ".jsx",
+        Json = ".json"
+    }
+    interface ResolvedModuleWithFailedLookupLocations {
+        readonly resolvedModule: ResolvedModuleFull | undefined;
+        readonly failedLookupLocations: ReadonlyArray<string>;
+    }
+    interface ResolvedTypeReferenceDirective {
+        primary: boolean;
+        resolvedFileName: string | undefined;
+        packageId?: PackageId;
+    }
+    interface ResolvedTypeReferenceDirectiveWithFailedLookupLocations {
+        readonly resolvedTypeReferenceDirective: ResolvedTypeReferenceDirective | undefined;
+        readonly failedLookupLocations: ReadonlyArray<string>;
+    }
+    type HasInvalidatedResolution = (sourceFile: Path) => boolean;
+    interface CompilerHost extends ModuleResolutionHost {
+        getSourceFile(fileName: string, languageVersion: ScriptTarget, onError?: (message: string) => void, shouldCreateNewSourceFile?: boolean): SourceFile | undefined;
+        getSourceFileByPath?(fileName: string, path: Path, languageVersion: ScriptTarget, onError?: (message: string) => void, shouldCreateNewSourceFile?: boolean): SourceFile | undefined;
+        getCancellationToken?(): CancellationToken;
+        getDefaultLibFileName(options: CompilerOptions): string;
+        getDefaultLibLocation?(): string;
+        writeFile: WriteFileCallback;
+        getCurrentDirectory(): string;
+        getDirectories(path: string): string[];
+        getCanonicalFileName(fileName: string): string;
+        useCaseSensitiveFileNames(): boolean;
+        getNewLine(): string;
+        readDirectory?(rootDir: string, extensions: ReadonlyArray<string>, excludes: ReadonlyArray<string> | undefined, includes: ReadonlyArray<string>, depth?: number): string[];
+        resolveModuleNames?(moduleNames: string[], containingFile: string, reusedNames?: string[]): (ResolvedModule | undefined)[];
+        /**
+         * This method is a companion for 'resolveModuleNames' and is used to resolve 'types' references to actual type declaration files
+         */
+        resolveTypeReferenceDirectives?(typeReferenceDirectiveNames: string[], containingFile: string): ResolvedTypeReferenceDirective[];
+        getEnvironmentVariable?(name: string): string | undefined;
+        onReleaseOldSourceFile?(oldSourceFile: SourceFile, oldOptions: CompilerOptions): void;
+        hasInvalidatedResolution?: HasInvalidatedResolution;
+        hasChangedAutomaticTypeDirectiveNames?: boolean;
+        createHash?(data: string): string;
+        getModifiedTime?(fileName: string): Date;
+        setModifiedTime?(fileName: string, date: Date): void;
+        deleteFile?(fileName: string): void;
+    }
+    enum TransformFlags {
+        None = 0,
+        TypeScript = 1,
+        ContainsTypeScript = 2,
+        ContainsJsx = 4,
+        ContainsESNext = 8,
+        ContainsES2017 = 16,
+        ContainsES2016 = 32,
+        ES2015 = 64,
+        ContainsES2015 = 128,
+        Generator = 256,
+        ContainsGenerator = 512,
+        DestructuringAssignment = 1024,
+        ContainsDestructuringAssignment = 2048,
+        ContainsDecorators = 4096,
+        ContainsPropertyInitializer = 8192,
+        ContainsLexicalThis = 16384,
+        ContainsCapturedLexicalThis = 32768,
+        ContainsLexicalThisInComputedPropertyName = 65536,
+        ContainsDefaultValueAssignments = 131072,
+        ContainsParameterPropertyAssignments = 262144,
+        ContainsSpread = 524288,
+        ContainsObjectSpread = 1048576,
+        ContainsRest = 524288,
+        ContainsObjectRest = 1048576,
+        ContainsComputedPropertyName = 2097152,
+        ContainsBlockScopedBinding = 4194304,
+        ContainsBindingPattern = 8388608,
+        ContainsYield = 16777216,
+        ContainsHoistedDeclarationOrCompletion = 33554432,
+        ContainsDynamicImport = 67108864,
+        Super = 134217728,
+        ContainsSuper = 268435456,
+        HasComputedFlags = 536870912,
+        AssertTypeScript = 3,
+        AssertJsx = 4,
+        AssertESNext = 8,
+        AssertES2017 = 16,
+        AssertES2016 = 32,
+        AssertES2015 = 192,
+        AssertGenerator = 768,
+        AssertDestructuringAssignment = 3072,
+        OuterExpressionExcludes = 536872257,
+        PropertyAccessExcludes = 671089985,
+        NodeExcludes = 939525441,
+        ArrowFunctionExcludes = 1003902273,
+        FunctionExcludes = 1003935041,
+        ConstructorExcludes = 1003668801,
+        MethodOrAccessorExcludes = 1003668801,
+        ClassExcludes = 942011713,
+        ModuleExcludes = 977327425,
+        TypeExcludes = -3,
+        ObjectLiteralExcludes = 942740801,
+        ArrayLiteralOrCallOrNewExcludes = 940049729,
+        VariableDeclarationListExcludes = 948962625,
+        ParameterExcludes = 939525441,
+        CatchClauseExcludes = 940574017,
+        BindingPatternExcludes = 940049729,
+        TypeScriptClassSyntaxMask = 274432,
+        ES2015FunctionSyntaxMask = 163840
+    }
+    interface SourceMapRange extends TextRange {
+        source?: SourceMapSource;
+    }
+    interface SourceMapSource {
+        fileName: string;
+        text: string;
+        lineMap: ReadonlyArray<number>;
+        skipTrivia?: (pos: number) => number;
+    }
+    interface EmitNode {
+        annotatedNodes?: Node[];
+        flags: EmitFlags;
+        leadingComments?: SynthesizedComment[];
+        trailingComments?: SynthesizedComment[];
+        commentRange?: TextRange;
+        sourceMapRange?: SourceMapRange;
+        tokenSourceMapRanges?: (SourceMapRange | undefined)[];
+        constantValue?: string | number;
+        externalHelpersModuleName?: Identifier;
+        helpers?: EmitHelper[];
+        startsOnNewLine?: boolean;
+    }
+    enum EmitFlags {
+        None = 0,
+        SingleLine = 1,
+        AdviseOnEmitNode = 2,
+        NoSubstitution = 4,
+        CapturesThis = 8,
+        NoLeadingSourceMap = 16,
+        NoTrailingSourceMap = 32,
+        NoSourceMap = 48,
+        NoNestedSourceMaps = 64,
+        NoTokenLeadingSourceMaps = 128,
+        NoTokenTrailingSourceMaps = 256,
+        NoTokenSourceMaps = 384,
+        NoLeadingComments = 512,
+        NoTrailingComments = 1024,
+        NoComments = 1536,
+        NoNestedComments = 2048,
+        HelperName = 4096,
+        ExportName = 8192,
+        LocalName = 16384,
+        InternalName = 32768,
+        Indented = 65536,
+        NoIndentation = 131072,
+        AsyncFunctionBody = 262144,
+        ReuseTempVariableScope = 524288,
+        CustomPrologue = 1048576,
+        NoHoisting = 2097152,
+        HasEndOfDeclarationMarker = 4194304,
+        Iterator = 8388608,
+        NoAsciiEscaping = 16777216,
+        TypeScriptClassWrapper = 33554432,
+        NeverApplyImportHelper = 67108864
+    }
+    interface EmitHelper {
+        readonly name: string;
+        readonly scoped: boolean;
+        readonly text: string | ((node: EmitHelperUniqueNameCallback) => string);
+        readonly priority?: number;
+    }
+    type UniqueNameHandler = (baseName: string, checkFn?: (name: string) => boolean, optimistic?: boolean) => string;
+    type EmitHelperUniqueNameCallback = (name: string) => string;
+    /**
+     * Used by the checker, this enum keeps track of external emit helpers that should be type
+     * checked.
+     */
+    enum ExternalEmitHelpers {
+        Extends = 1,
+        Assign = 2,
+        Rest = 4,
+        Decorate = 8,
+        Metadata = 16,
+        Param = 32,
+        Awaiter = 64,
+        Generator = 128,
+        Values = 256,
+        Read = 512,
+        Spread = 1024,
+        Await = 2048,
+        AsyncGenerator = 4096,
+        AsyncDelegator = 8192,
+        AsyncValues = 16384,
+        ExportStar = 32768,
+        MakeTemplateObject = 65536,
+        FirstEmitHelper = 1,
+        LastEmitHelper = 65536,
+        ForOfIncludes = 256,
+        ForAwaitOfIncludes = 16384,
+        AsyncGeneratorIncludes = 6144,
+        AsyncDelegatorIncludes = 26624,
+        SpreadIncludes = 1536
+    }
+    enum EmitHint {
+        SourceFile = 0,
+        Expression = 1,
+        IdentifierName = 2,
+        MappedTypeParameter = 3,
+        Unspecified = 4
+    }
+    interface EmitHost extends ScriptReferenceHost, ModuleSpecifierResolutionHost {
+        getSourceFiles(): ReadonlyArray<SourceFile>;
+        getCurrentDirectory(): string;
+        isSourceFileFromExternalLibrary(file: SourceFile): boolean;
+        getCommonSourceDirectory(): string;
+        getCanonicalFileName(fileName: string): string;
+        getNewLine(): string;
+        isEmitBlocked(emitFileName: string): boolean;
+        getPrependNodes(): ReadonlyArray<InputFiles>;
+        writeFile: WriteFileCallback;
+    }
+    interface TransformationContext {
+        getEmitResolver(): EmitResolver;
+        getEmitHost(): EmitHost;
+        /** Gets the compiler options supplied to the transformer. */
+        getCompilerOptions(): CompilerOptions;
+        /** Starts a new lexical environment. */
+        startLexicalEnvironment(): void;
+        /** Suspends the current lexical environment, usually after visiting a parameter list. */
+        suspendLexicalEnvironment(): void;
+        /** Resumes a suspended lexical environment, usually before visiting a function body. */
+        resumeLexicalEnvironment(): void;
+        /** Ends a lexical environment, returning any declarations. */
+        endLexicalEnvironment(): Statement[] | undefined;
+        /** Hoists a function declaration to the containing scope. */
+        hoistFunctionDeclaration(node: FunctionDeclaration): void;
+        /** Hoists a variable declaration to the containing scope. */
+        hoistVariableDeclaration(node: Identifier): void;
+        /** Records a request for a non-scoped emit helper in the current context. */
+        requestEmitHelper(helper: EmitHelper): void;
+        /** Gets and resets the requested non-scoped emit helpers. */
+        readEmitHelpers(): EmitHelper[] | undefined;
+        /** Enables expression substitutions in the pretty printer for the provided SyntaxKind. */
+        enableSubstitution(kind: SyntaxKind): void;
+        /** Determines whether expression substitutions are enabled for the provided node. */
+        isSubstitutionEnabled(node: Node): boolean;
+        /**
+         * Hook used by transformers to substitute expressions just before they
+         * are emitted by the pretty printer.
+         *
+         * NOTE: Transformation hooks should only be modified during `Transformer` initialization,
+         * before returning the `NodeTransformer` callback.
+         */
+        onSubstituteNode: (hint: EmitHint, node: Node) => Node;
+        /**
+         * Enables before/after emit notifications in the pretty printer for the provided
+         * SyntaxKind.
+         */
+        enableEmitNotification(kind: SyntaxKind): void;
+        /**
+         * Determines whether before/after emit notifications should be raised in the pretty
+         * printer when it emits a node.
+         */
+        isEmitNotificationEnabled(node: Node): boolean;
+        /**
+         * Hook used to allow transformers to capture state before or after
+         * the printer emits a node.
+         *
+         * NOTE: Transformation hooks should only be modified during `Transformer` initialization,
+         * before returning the `NodeTransformer` callback.
+         */
+        onEmitNode: (hint: EmitHint, node: Node, emitCallback: (hint: EmitHint, node: Node) => void) => void;
+        addDiagnostic(diag: DiagnosticWithLocation): void;
+    }
+    interface TransformationResult<T extends Node> {
+        /** Gets the transformed source files. */
+        transformed: T[];
+        /** Gets diagnostics for the transformation. */
+        diagnostics?: DiagnosticWithLocation[];
+        /**
+         * Gets a substitute for a node, if one is available; otherwise, returns the original node.
+         *
+         * @param hint A hint as to the intended usage of the node.
+         * @param node The node to substitute.
+         */
+        substituteNode(hint: EmitHint, node: Node): Node;
+        /**
+         * Emits a node with possible notification.
+         *
+         * @param hint A hint as to the intended usage of the node.
+         * @param node The node to emit.
+         * @param emitCallback A callback used to emit the node.
+         */
+        emitNodeWithNotification(hint: EmitHint, node: Node, emitCallback: (hint: EmitHint, node: Node) => void): void;
+        /**
+         * Clean up EmitNode entries on any parse-tree nodes.
+         */
+        dispose(): void;
+    }
+    /**
+     * A function that is used to initialize and return a `Transformer` callback, which in turn
+     * will be used to transform one or more nodes.
+     */
+    type TransformerFactory<T extends Node> = (context: TransformationContext) => Transformer<T>;
+    /**
+     * A function that transforms a node.
+     */
+    type Transformer<T extends Node> = (node: T) => T;
+    /**
+     * A function that accepts and possibly transforms a node.
+     */
+    type Visitor = (node: Node) => VisitResult<Node>;
+    type VisitResult<T extends Node> = T | T[] | undefined;
+    interface Printer {
+        /**
+         * Print a node and its subtree as-is, without any emit transformations.
+         * @param hint A value indicating the purpose of a node. This is primarily used to
+         * distinguish between an `Identifier` used in an expression position, versus an
+         * `Identifier` used as an `IdentifierName` as part of a declaration. For most nodes you
+         * should just pass `Unspecified`.
+         * @param node The node to print. The node and its subtree are printed as-is, without any
+         * emit transformations.
+         * @param sourceFile A source file that provides context for the node. The source text of
+         * the file is used to emit the original source content for literals and identifiers, while
+         * the identifiers of the source file are used when generating unique names to avoid
+         * collisions.
+         */
+        printNode(hint: EmitHint, node: Node, sourceFile: SourceFile): string;
+        /**
+         * Prints a list of nodes using the given format flags
+         */
+        printList<T extends Node>(format: ListFormat, list: NodeArray<T>, sourceFile: SourceFile): string;
+        /**
+         * Prints a source file as-is, without any emit transformations.
+         */
+        printFile(sourceFile: SourceFile): string;
+        /**
+         * Prints a bundle of source files as-is, without any emit transformations.
+         */
+        printBundle(bundle: Bundle): string;
+        writeNode(hint: EmitHint, node: Node, sourceFile: SourceFile | undefined, writer: EmitTextWriter): void;
+        writeList<T extends Node>(format: ListFormat, list: NodeArray<T> | undefined, sourceFile: SourceFile | undefined, writer: EmitTextWriter): void;
+        writeFile(sourceFile: SourceFile, writer: EmitTextWriter): void;
+        writeBundle(bundle: Bundle, writer: EmitTextWriter, info?: BundleInfo): void;
+    }
+    /**
+     * When a bundle contains prepended content, we store a file on disk indicating where the non-prepended
+     * content of that file starts. On a subsequent build where there are no upstream .d.ts changes, we
+     * read the bundle info file and the original .js file to quickly re-use portion of the file
+     * that didn't originate in prepended content.
+     */
+    interface BundleInfo {
+        originalOffset: number;
+        totalLength: number;
+    }
+    interface PrintHandlers {
+        /**
+         * A hook used by the Printer when generating unique names to avoid collisions with
+         * globally defined names that exist outside of the current source file.
+         */
+        hasGlobalName?(name: string): boolean;
+        /**
+         * A hook used by the Printer to provide notifications prior to emitting a node. A
+         * compatible implementation **must** invoke `emitCallback` with the provided `hint` and
+         * `node` values.
+         * @param hint A hint indicating the intended purpose of the node.
+         * @param node The node to emit.
+         * @param emitCallback A callback that, when invoked, will emit the node.
+         * @example
+         * ```ts
+         * var printer = createPrinter(printerOptions, {
+         *   onEmitNode(hint, node, emitCallback) {
+         *     // set up or track state prior to emitting the node...
+         *     emitCallback(hint, node);
+         *     // restore state after emitting the node...
+         *   }
+         * });
+         * ```
+         */
+        onEmitNode?(hint: EmitHint, node: Node | undefined, emitCallback: (hint: EmitHint, node: Node | undefined) => void): void;
+        /**
+         * A hook used by the Printer to perform just-in-time substitution of a node. This is
+         * primarily used by node transformations that need to substitute one node for another,
+         * such as replacing `myExportedVar` with `exports.myExportedVar`.
+         * @param hint A hint indicating the intended purpose of the node.
+         * @param node The node to emit.
+         * @example
+         * ```ts
+         * var printer = createPrinter(printerOptions, {
+         *   substituteNode(hint, node) {
+         *     // perform substitution if necessary...
+         *     return node;
+         *   }
+         * });
+         * ```
+         */
+        substituteNode?(hint: EmitHint, node: Node): Node;
+        onEmitSourceMapOfNode?: (hint: EmitHint, node: Node, emitCallback: (hint: EmitHint, node: Node) => void) => void;
+        onEmitSourceMapOfToken?: (node: Node | undefined, token: SyntaxKind, writer: (s: string) => void, pos: number, emitCallback: (token: SyntaxKind, writer: (s: string) => void, pos: number) => number) => number;
+        onEmitSourceMapOfPosition?: (pos: number) => void;
+        onSetSourceFile?: (node: SourceFile) => void;
+        onBeforeEmitNodeArray?: (nodes: NodeArray<any> | undefined) => void;
+        onAfterEmitNodeArray?: (nodes: NodeArray<any> | undefined) => void;
+        onBeforeEmitToken?: (node: Node) => void;
+        onAfterEmitToken?: (node: Node) => void;
+    }
+    interface PrinterOptions {
+        removeComments?: boolean;
+        newLine?: NewLineKind;
+        omitTrailingSemicolon?: boolean;
+        noEmitHelpers?: boolean;
+        module?: CompilerOptions["module"];
+        target?: CompilerOptions["target"];
+        sourceMap?: boolean;
+        inlineSourceMap?: boolean;
+        extendedDiagnostics?: boolean;
+        onlyPrintJsDocStyle?: boolean;
+    }
+    interface EmitTextWriter extends SymbolWriter {
+        write(s: string): void;
+        writeTextOfNode(text: string, node: Node): void;
+        getText(): string;
+        rawWrite(s: string): void;
+        writeLiteral(s: string): void;
+        getTextPos(): number;
+        getLine(): number;
+        getColumn(): number;
+        getIndent(): number;
+        isAtStartOfLine(): boolean;
+    }
+    interface GetEffectiveTypeRootsHost {
+        directoryExists?(directoryName: string): boolean;
+        getCurrentDirectory?(): string;
+    }
+    /** @internal */
+    interface ModuleSpecifierResolutionHost extends GetEffectiveTypeRootsHost {
+        useCaseSensitiveFileNames?(): boolean;
+        fileExists?(path: string): boolean;
+        readFile?(path: string): string | undefined;
+    }
+    /** @deprecated See comment on SymbolWriter */
+    interface SymbolTracker {
+        trackSymbol?(symbol: Symbol, enclosingDeclaration?: Node, meaning?: SymbolFlags): void;
+        reportInaccessibleThisError?(): void;
+        reportPrivateInBaseOfClassExpression?(propertyName: string): void;
+        reportInaccessibleUniqueSymbolError?(): void;
+        moduleResolverHost?: ModuleSpecifierResolutionHost;
+        trackReferencedAmbientModule?(decl: ModuleDeclaration): void;
+    }
+    interface TextSpan {
+        start: number;
+        length: number;
+    }
+    interface TextChangeRange {
+        span: TextSpan;
+        newLength: number;
+    }
+    interface DiagnosticCollection {
+        add(diagnostic: Diagnostic): void;
+        getGlobalDiagnostics(): Diagnostic[];
+        getDiagnostics(fileName: string): DiagnosticWithLocation[];
+        getDiagnostics(): Diagnostic[];
+        reattachFileDiagnostics(newFile: SourceFile): void;
+    }
+    interface SyntaxList extends Node {
+        _children: Node[];
+    }
+    enum ListFormat {
+        None = 0,
+        SingleLine = 0,
+        MultiLine = 1,
+        PreserveLines = 2,
+        LinesMask = 3,
+        NotDelimited = 0,
+        BarDelimited = 4,
+        AmpersandDelimited = 8,
+        CommaDelimited = 16,
+        DelimitersMask = 28,
+        AllowTrailingComma = 32,
+        Indented = 64,
+        SpaceBetweenBraces = 128,
+        SpaceBetweenSiblings = 256,
+        Braces = 512,
+        Parenthesis = 1024,
+        AngleBrackets = 2048,
+        SquareBrackets = 4096,
+        BracketsMask = 7680,
+        OptionalIfUndefined = 8192,
+        OptionalIfEmpty = 16384,
+        Optional = 24576,
+        PreferNewLine = 32768,
+        NoTrailingNewLine = 65536,
+        NoInterveningComments = 131072,
+        NoSpaceIfEmpty = 262144,
+        SingleElement = 524288,
+        Modifiers = 131328,
+        HeritageClauses = 256,
+        SingleLineTypeLiteralMembers = 384,
+        MultiLineTypeLiteralMembers = 16449,
+        TupleTypeElements = 272,
+        UnionTypeConstituents = 260,
+        IntersectionTypeConstituents = 264,
+        ObjectBindingPatternElements = 262576,
+        ArrayBindingPatternElements = 262448,
+        ObjectLiteralExpressionProperties = 263122,
+        ArrayLiteralExpressionElements = 4466,
+        CommaListElements = 272,
+        CallExpressionArguments = 1296,
+        NewExpressionArguments = 9488,
+        TemplateExpressionSpans = 131072,
+        SingleLineBlockStatements = 384,
+        MultiLineBlockStatements = 65,
+        VariableDeclarationList = 272,
+        SingleLineFunctionBodyStatements = 384,
+        MultiLineFunctionBodyStatements = 1,
+        ClassHeritageClauses = 0,
+        ClassMembers = 65,
+        InterfaceMembers = 65,
+        EnumMembers = 81,
+        CaseBlockClauses = 65,
+        NamedImportsOrExportsElements = 262576,
+        JsxElementOrFragmentChildren = 131072,
+        JsxElementAttributes = 131328,
+        CaseOrDefaultClauseStatements = 81985,
+        HeritageClauseTypes = 272,
+        SourceFileStatements = 65537,
+        Decorators = 24577,
+        TypeArguments = 26896,
+        TypeParameters = 26896,
+        Parameters = 1296,
+        IndexSignatureParameters = 4432
+    }
+    enum PragmaKindFlags {
+        None = 0,
+        /**
+         * Triple slash comment of the form
+         * /// <pragma-name argname="value" />
+         */
+        TripleSlashXML = 1,
+        /**
+         * Single line comment of the form
+         * // @pragma-name argval1 argval2
+         * or
+         * /// @pragma-name argval1 argval2
+         */
+        SingleLine = 2,
+        /**
+         * Multiline non-jsdoc pragma of the form
+         * /* @pragma-name argval1 argval2 * /
+         */
+        MultiLine = 4,
+        All = 7,
+        Default = 7
+    }
+    interface PragmaArgumentSpecification<TName extends string> {
+        name: TName;
+        optional?: boolean;
+        captureSpan?: boolean;
+    }
+    interface PragmaDefinition<T1 extends string = string, T2 extends string = string, T3 extends string = string, T4 extends string = string> {
+        args?: [PragmaArgumentSpecification<T1>] | [PragmaArgumentSpecification<T1>, PragmaArgumentSpecification<T2>] | [PragmaArgumentSpecification<T1>, PragmaArgumentSpecification<T2>, PragmaArgumentSpecification<T3>] | [PragmaArgumentSpecification<T1>, PragmaArgumentSpecification<T2>, PragmaArgumentSpecification<T3>, PragmaArgumentSpecification<T4>];
+        kind?: PragmaKindFlags;
+    }
+    const commentPragmas: {
+        "reference": {
+            args: [{
+                name: "types";
+                optional: true;
+                captureSpan: true;
+            }, {
+                name: "lib";
+                optional: true;
+                captureSpan: true;
+            }, {
+                name: "path";
+                optional: true;
+                captureSpan: true;
+            }, {
+                name: "no-default-lib";
+                optional: true;
+            }];
+            kind: PragmaKindFlags;
+        };
+        "amd-dependency": {
+            args: [{
+                name: "path";
+            }, {
+                name: "name";
+                optional: true;
+            }];
+            kind: PragmaKindFlags;
+        };
+        "amd-module": {
+            args: [{
+                name: "name";
+            }];
+            kind: PragmaKindFlags;
+        };
+        "ts-check": {
+            kind: PragmaKindFlags;
+        };
+        "ts-nocheck": {
+            kind: PragmaKindFlags;
+        };
+        "jsx": {
+            args: [{
+                name: "factory";
+            }];
+            kind: PragmaKindFlags;
+        };
+    };
+    type PragmaArgTypeMaybeCapture<TDesc> = TDesc extends {
+        captureSpan: true;
+    } ? {
+        value: string;
+        pos: number;
+        end: number;
+    } : string;
+    type PragmaArgTypeOptional<TDesc, TName extends string> = TDesc extends {
+        optional: true;
+    } ? {
+        [K in TName]?: PragmaArgTypeMaybeCapture<TDesc>;
+    } : {
+        [K in TName]: PragmaArgTypeMaybeCapture<TDesc>;
+    };
+    /**
+     * Maps a pragma definition into the desired shape for its arguments object
+     * Maybe the below is a good argument for types being iterable on struture in some way.
+     */
+    type PragmaArgumentType<T extends PragmaDefinition> = T extends {
+        args: [PragmaArgumentSpecification<infer TName1>, PragmaArgumentSpecification<infer TName2>, PragmaArgumentSpecification<infer TName3>, PragmaArgumentSpecification<infer TName4>];
+    } ? PragmaArgTypeOptional<T["args"][0], TName1> & PragmaArgTypeOptional<T["args"][1], TName2> & PragmaArgTypeOptional<T["args"][2], TName3> & PragmaArgTypeOptional<T["args"][2], TName4> : T extends {
+        args: [PragmaArgumentSpecification<infer TName1>, PragmaArgumentSpecification<infer TName2>, PragmaArgumentSpecification<infer TName3>];
+    } ? PragmaArgTypeOptional<T["args"][0], TName1> & PragmaArgTypeOptional<T["args"][1], TName2> & PragmaArgTypeOptional<T["args"][2], TName3> : T extends {
+        args: [PragmaArgumentSpecification<infer TName1>, PragmaArgumentSpecification<infer TName2>];
+    } ? PragmaArgTypeOptional<T["args"][0], TName1> & PragmaArgTypeOptional<T["args"][1], TName2> : T extends {
+        args: [PragmaArgumentSpecification<infer TName>];
+    } ? PragmaArgTypeOptional<T["args"][0], TName> : object;
+    type ConcretePragmaSpecs = typeof commentPragmas;
+    type PragmaPsuedoMap = {
+        [K in keyof ConcretePragmaSpecs]?: {
+            arguments: PragmaArgumentType<ConcretePragmaSpecs[K]>;
+            range: CommentRange;
+        };
+    };
+    type PragmaPsuedoMapEntry = {
+        [K in keyof PragmaPsuedoMap]: {
+            name: K;
+            args: PragmaPsuedoMap[K];
+        };
+    }[keyof PragmaPsuedoMap];
+    /**
+     * A strongly-typed es6 map of pragma entries, the values of which are either a single argument
+     * value (if only one was found), or an array of multiple argument values if the pragma is present
+     * in multiple places
+     */
+    interface PragmaMap extends Map<PragmaPsuedoMap[keyof PragmaPsuedoMap] | PragmaPsuedoMap[keyof PragmaPsuedoMap][]> {
+        set<TKey extends keyof PragmaPsuedoMap>(key: TKey, value: PragmaPsuedoMap[TKey] | PragmaPsuedoMap[TKey][]): this;
+        get<TKey extends keyof PragmaPsuedoMap>(key: TKey): PragmaPsuedoMap[TKey] | PragmaPsuedoMap[TKey][];
+        forEach(action: <TKey extends keyof PragmaPsuedoMap>(value: PragmaPsuedoMap[TKey] | PragmaPsuedoMap[TKey][], key: TKey) => void): void;
+    }
+}
+declare function setTimeout(handler: (...args: any[]) => void, timeout: number): any;
+declare function clearTimeout(handle: any): void;
+declare namespace ts {
+    /**
+     * Set a high stack trace limit to provide more information in case of an error.
+     * Called for command-line and server use cases.
+     * Not called if TypeScript is used as a library.
+     */
+    function setStackTraceLimit(): void;
+    enum FileWatcherEventKind {
+        Created = 0,
+        Changed = 1,
+        Deleted = 2
+    }
+    type FileWatcherCallback = (fileName: string, eventKind: FileWatcherEventKind) => void;
+    type DirectoryWatcherCallback = (fileName: string) => void;
+    interface WatchedFile {
+        readonly fileName: string;
+        readonly callback: FileWatcherCallback;
+        mtime: Date;
+    }
+    enum PollingInterval {
+        High = 2000,
+        Medium = 500,
+        Low = 250
+    }
+    function watchFileUsingPriorityPollingInterval(host: System, fileName: string, callback: FileWatcherCallback, watchPriority: PollingInterval): FileWatcher;
+    type HostWatchFile = (fileName: string, callback: FileWatcherCallback, pollingInterval: PollingInterval | undefined) => FileWatcher;
+    type HostWatchDirectory = (fileName: string, callback: DirectoryWatcherCallback, recursive?: boolean) => FileWatcher;
+    const missingFileModifiedTime: Date;
+    let unchangedPollThresholds: {
+        [PollingInterval.Low]: number;
+        [PollingInterval.Medium]: number;
+        [PollingInterval.High]: number;
+    };
+    function setCustomPollingValues(system: System): void;
+    function createDynamicPriorityPollingWatchFile(host: {
+        getModifiedTime: System["getModifiedTime"];
+        setTimeout: System["setTimeout"];
+    }): HostWatchFile;
+    /**
+     * Returns true if file status changed
+     */
+    function onWatchedFileStat(watchedFile: WatchedFile, modifiedTime: Date): boolean;
+    interface RecursiveDirectoryWatcherHost {
+        watchDirectory: HostWatchDirectory;
+        getAccessibleSortedChildDirectories(path: string): ReadonlyArray<string>;
+        directoryExists(dir: string): boolean;
+        filePathComparer: Comparer<string>;
+        realpath(s: string): string;
+    }
+    /**
+     * Watch the directory recursively using host provided method to watch child directories
+     * that means if this is recursive watcher, watch the children directories as well
+     * (eg on OS that dont support recursive watch using fs.watch use fs.watchFile)
+     */
+    function createRecursiveDirectoryWatcher(host: RecursiveDirectoryWatcherHost): (directoryName: string, callback: DirectoryWatcherCallback) => FileWatcher;
+    interface System {
+        args: string[];
+        newLine: string;
+        useCaseSensitiveFileNames: boolean;
+        write(s: string): void;
+        writeOutputIsTTY?(): boolean;
+        readFile(path: string, encoding?: string): string | undefined;
+        getFileSize?(path: string): number;
+        writeFile(path: string, data: string, writeByteOrderMark?: boolean): void;
+        /**
+         * @pollingInterval - this parameter is used in polling-based watchers and ignored in watchers that
+         * use native OS file watching
+         */
+        watchFile?(path: string, callback: FileWatcherCallback, pollingInterval?: number): FileWatcher;
+        watchDirectory?(path: string, callback: DirectoryWatcherCallback, recursive?: boolean): FileWatcher;
+        resolvePath(path: string): string;
+        fileExists(path: string): boolean;
+        directoryExists(path: string): boolean;
+        createDirectory(path: string): void;
+        getExecutingFilePath(): string;
+        getCurrentDirectory(): string;
+        getDirectories(path: string): string[];
+        readDirectory(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
+        getModifiedTime?(path: string): Date;
+        setModifiedTime?(path: string, time: Date): void;
+        deleteFile?(path: string): void;
+        /**
+         * A good implementation is node.js' `crypto.createHash`. (https://nodejs.org/api/crypto.html#crypto_crypto_createhash_algorithm)
+         */
+        createHash?(data: string): string;
+        /** This must be cryptographically secure. Only implement this method using `crypto.createHash("sha256")`. */
+        createSHA256Hash?(data: string): string;
+        getMemoryUsage?(): number;
+        exit(exitCode?: number): void;
+        realpath?(path: string): string;
+        getEnvironmentVariable(name: string): string;
+        tryEnableSourceMapsForHost?(): void;
+        debugMode?: boolean;
+        setTimeout?(callback: (...args: any[]) => void, ms: number, ...args: any[]): any;
+        clearTimeout?(timeoutId: any): void;
+        clearScreen?(): void;
+        setBlocking?(): void;
+        base64decode?(input: string): string;
+        base64encode?(input: string): string;
+    }
+    interface FileWatcher {
+        close(): void;
+    }
+    function getNodeMajorVersion(): number | undefined;
+    let sys: System;
+}
+declare namespace ts {
+    const Diagnostics: {
+        Unterminated_string_literal: DiagnosticMessage;
+        Identifier_expected: DiagnosticMessage;
+        _0_expected: DiagnosticMessage;
+        A_file_cannot_have_a_reference_to_itself: DiagnosticMessage;
+        Trailing_comma_not_allowed: DiagnosticMessage;
+        Asterisk_Slash_expected: DiagnosticMessage;
+        An_element_access_expression_should_take_an_argument: DiagnosticMessage;
+        Unexpected_token: DiagnosticMessage;
+        A_rest_parameter_or_binding_pattern_may_not_have_a_trailing_comma: DiagnosticMessage;
+        A_rest_parameter_must_be_last_in_a_parameter_list: DiagnosticMessage;
+        Parameter_cannot_have_question_mark_and_initializer: DiagnosticMessage;
+        A_required_parameter_cannot_follow_an_optional_parameter: DiagnosticMessage;
+        An_index_signature_cannot_have_a_rest_parameter: DiagnosticMessage;
+        An_index_signature_parameter_cannot_have_an_accessibility_modifier: DiagnosticMessage;
+        An_index_signature_parameter_cannot_have_a_question_mark: DiagnosticMessage;
+        An_index_signature_parameter_cannot_have_an_initializer: DiagnosticMessage;
+        An_index_signature_must_have_a_type_annotation: DiagnosticMessage;
+        An_index_signature_parameter_must_have_a_type_annotation: DiagnosticMessage;
+        An_index_signature_parameter_type_must_be_string_or_number: DiagnosticMessage;
+        readonly_modifier_can_only_appear_on_a_property_declaration_or_index_signature: DiagnosticMessage;
+        Accessibility_modifier_already_seen: DiagnosticMessage;
+        _0_modifier_must_precede_1_modifier: DiagnosticMessage;
+        _0_modifier_already_seen: DiagnosticMessage;
+        _0_modifier_cannot_appear_on_a_class_element: DiagnosticMessage;
+        super_must_be_followed_by_an_argument_list_or_member_access: DiagnosticMessage;
+        Only_ambient_modules_can_use_quoted_names: DiagnosticMessage;
+        Statements_are_not_allowed_in_ambient_contexts: DiagnosticMessage;
+        A_declare_modifier_cannot_be_used_in_an_already_ambient_context: DiagnosticMessage;
+        Initializers_are_not_allowed_in_ambient_contexts: DiagnosticMessage;
+        _0_modifier_cannot_be_used_in_an_ambient_context: DiagnosticMessage;
+        _0_modifier_cannot_be_used_with_a_class_declaration: DiagnosticMessage;
+        _0_modifier_cannot_be_used_here: DiagnosticMessage;
+        _0_modifier_cannot_appear_on_a_data_property: DiagnosticMessage;
+        _0_modifier_cannot_appear_on_a_module_or_namespace_element: DiagnosticMessage;
+        A_0_modifier_cannot_be_used_with_an_interface_declaration: DiagnosticMessage;
+        A_declare_modifier_is_required_for_a_top_level_declaration_in_a_d_ts_file: DiagnosticMessage;
+        A_rest_parameter_cannot_be_optional: DiagnosticMessage;
+        A_rest_parameter_cannot_have_an_initializer: DiagnosticMessage;
+        A_set_accessor_must_have_exactly_one_parameter: DiagnosticMessage;
+        A_set_accessor_cannot_have_an_optional_parameter: DiagnosticMessage;
+        A_set_accessor_parameter_cannot_have_an_initializer: DiagnosticMessage;
+        A_set_accessor_cannot_have_rest_parameter: DiagnosticMessage;
+        A_get_accessor_cannot_have_parameters: DiagnosticMessage;
+        Type_0_is_not_a_valid_async_function_return_type_in_ES5_SlashES3_because_it_does_not_refer_to_a_Promise_compatible_constructor_value: DiagnosticMessage;
+        Accessors_are_only_available_when_targeting_ECMAScript_5_and_higher: DiagnosticMessage;
+        An_async_function_or_method_must_have_a_valid_awaitable_return_type: DiagnosticMessage;
+        The_return_type_of_an_async_function_must_either_be_a_valid_promise_or_must_not_contain_a_callable_then_member: DiagnosticMessage;
+        A_promise_must_have_a_then_method: DiagnosticMessage;
+        The_first_parameter_of_the_then_method_of_a_promise_must_be_a_callback: DiagnosticMessage;
+        Enum_member_must_have_initializer: DiagnosticMessage;
+        Type_is_referenced_directly_or_indirectly_in_the_fulfillment_callback_of_its_own_then_method: DiagnosticMessage;
+        An_export_assignment_cannot_be_used_in_a_namespace: DiagnosticMessage;
+        The_return_type_of_an_async_function_or_method_must_be_the_global_Promise_T_type: DiagnosticMessage;
+        In_ambient_enum_declarations_member_initializer_must_be_constant_expression: DiagnosticMessage;
+        Unexpected_token_A_constructor_method_accessor_or_property_was_expected: DiagnosticMessage;
+        Unexpected_token_A_type_parameter_name_was_expected_without_curly_braces: DiagnosticMessage;
+        _0_modifier_cannot_appear_on_a_type_member: DiagnosticMessage;
+        _0_modifier_cannot_appear_on_an_index_signature: DiagnosticMessage;
+        A_0_modifier_cannot_be_used_with_an_import_declaration: DiagnosticMessage;
+        Invalid_reference_directive_syntax: DiagnosticMessage;
+        Octal_literals_are_not_available_when_targeting_ECMAScript_5_and_higher_Use_the_syntax_0: DiagnosticMessage;
+        An_accessor_cannot_be_declared_in_an_ambient_context: DiagnosticMessage;
+        _0_modifier_cannot_appear_on_a_constructor_declaration: DiagnosticMessage;
+        _0_modifier_cannot_appear_on_a_parameter: DiagnosticMessage;
+        Only_a_single_variable_declaration_is_allowed_in_a_for_in_statement: DiagnosticMessage;
+        Type_parameters_cannot_appear_on_a_constructor_declaration: DiagnosticMessage;
+        Type_annotation_cannot_appear_on_a_constructor_declaration: DiagnosticMessage;
+        An_accessor_cannot_have_type_parameters: DiagnosticMessage;
+        A_set_accessor_cannot_have_a_return_type_annotation: DiagnosticMessage;
+        An_index_signature_must_have_exactly_one_parameter: DiagnosticMessage;
+        _0_list_cannot_be_empty: DiagnosticMessage;
+        Type_parameter_list_cannot_be_empty: DiagnosticMessage;
+        Type_argument_list_cannot_be_empty: DiagnosticMessage;
+        Invalid_use_of_0_in_strict_mode: DiagnosticMessage;
+        with_statements_are_not_allowed_in_strict_mode: DiagnosticMessage;
+        delete_cannot_be_called_on_an_identifier_in_strict_mode: DiagnosticMessage;
+        A_for_await_of_statement_is_only_allowed_within_an_async_function_or_async_generator: DiagnosticMessage;
+        A_continue_statement_can_only_be_used_within_an_enclosing_iteration_statement: DiagnosticMessage;
+        A_break_statement_can_only_be_used_within_an_enclosing_iteration_or_switch_statement: DiagnosticMessage;
+        Jump_target_cannot_cross_function_boundary: DiagnosticMessage;
+        A_return_statement_can_only_be_used_within_a_function_body: DiagnosticMessage;
+        Expression_expected: DiagnosticMessage;
+        Type_expected: DiagnosticMessage;
+        A_default_clause_cannot_appear_more_than_once_in_a_switch_statement: DiagnosticMessage;
+        Duplicate_label_0: DiagnosticMessage;
+        A_continue_statement_can_only_jump_to_a_label_of_an_enclosing_iteration_statement: DiagnosticMessage;
+        A_break_statement_can_only_jump_to_a_label_of_an_enclosing_statement: DiagnosticMessage;
+        An_object_literal_cannot_have_multiple_properties_with_the_same_name_in_strict_mode: DiagnosticMessage;
+        An_object_literal_cannot_have_multiple_get_Slashset_accessors_with_the_same_name: DiagnosticMessage;
+        An_object_literal_cannot_have_property_and_accessor_with_the_same_name: DiagnosticMessage;
+        An_export_assignment_cannot_have_modifiers: DiagnosticMessage;
+        Octal_literals_are_not_allowed_in_strict_mode: DiagnosticMessage;
+        A_tuple_type_element_list_cannot_be_empty: DiagnosticMessage;
+        Variable_declaration_list_cannot_be_empty: DiagnosticMessage;
+        Digit_expected: DiagnosticMessage;
+        Hexadecimal_digit_expected: DiagnosticMessage;
+        Unexpected_end_of_text: DiagnosticMessage;
+        Invalid_character: DiagnosticMessage;
+        Declaration_or_statement_expected: DiagnosticMessage;
+        Statement_expected: DiagnosticMessage;
+        case_or_default_expected: DiagnosticMessage;
+        Property_or_signature_expected: DiagnosticMessage;
+        Enum_member_expected: DiagnosticMessage;
+        Variable_declaration_expected: DiagnosticMessage;
+        Argument_expression_expected: DiagnosticMessage;
+        Property_assignment_expected: DiagnosticMessage;
+        Expression_or_comma_expected: DiagnosticMessage;
+        Parameter_declaration_expected: DiagnosticMessage;
+        Type_parameter_declaration_expected: DiagnosticMessage;
+        Type_argument_expected: DiagnosticMessage;
+        String_literal_expected: DiagnosticMessage;
+        Line_break_not_permitted_here: DiagnosticMessage;
+        or_expected: DiagnosticMessage;
+        Declaration_expected: DiagnosticMessage;
+        Import_declarations_in_a_namespace_cannot_reference_a_module: DiagnosticMessage;
+        Cannot_use_imports_exports_or_module_augmentations_when_module_is_none: DiagnosticMessage;
+        File_name_0_differs_from_already_included_file_name_1_only_in_casing: DiagnosticMessage;
+        new_T_cannot_be_used_to_create_an_array_Use_new_Array_T_instead: DiagnosticMessage;
+        const_declarations_must_be_initialized: DiagnosticMessage;
+        const_declarations_can_only_be_declared_inside_a_block: DiagnosticMessage;
+        let_declarations_can_only_be_declared_inside_a_block: DiagnosticMessage;
+        Unterminated_template_literal: DiagnosticMessage;
+        Unterminated_regular_expression_literal: DiagnosticMessage;
+        An_object_member_cannot_be_declared_optional: DiagnosticMessage;
+        A_yield_expression_is_only_allowed_in_a_generator_body: DiagnosticMessage;
+        Computed_property_names_are_not_allowed_in_enums: DiagnosticMessage;
+        A_computed_property_name_in_an_ambient_context_must_refer_to_an_expression_whose_type_is_a_literal_type_or_a_unique_symbol_type: DiagnosticMessage;
+        A_computed_property_name_in_a_class_property_declaration_must_refer_to_an_expression_whose_type_is_a_literal_type_or_a_unique_symbol_type: DiagnosticMessage;
+        A_computed_property_name_in_a_method_overload_must_refer_to_an_expression_whose_type_is_a_literal_type_or_a_unique_symbol_type: DiagnosticMessage;
+        A_computed_property_name_in_an_interface_must_refer_to_an_expression_whose_type_is_a_literal_type_or_a_unique_symbol_type: DiagnosticMessage;
+        A_computed_property_name_in_a_type_literal_must_refer_to_an_expression_whose_type_is_a_literal_type_or_a_unique_symbol_type: DiagnosticMessage;
+        A_comma_expression_is_not_allowed_in_a_computed_property_name: DiagnosticMessage;
+        extends_clause_already_seen: DiagnosticMessage;
+        extends_clause_must_precede_implements_clause: DiagnosticMessage;
+        Classes_can_only_extend_a_single_class: DiagnosticMessage;
+        implements_clause_already_seen: DiagnosticMessage;
+        Interface_declaration_cannot_have_implements_clause: DiagnosticMessage;
+        Binary_digit_expected: DiagnosticMessage;
+        Octal_digit_expected: DiagnosticMessage;
+        Unexpected_token_expected: DiagnosticMessage;
+        Property_destructuring_pattern_expected: DiagnosticMessage;
+        Array_element_destructuring_pattern_expected: DiagnosticMessage;
+        A_destructuring_declaration_must_have_an_initializer: DiagnosticMessage;
+        An_implementation_cannot_be_declared_in_ambient_contexts: DiagnosticMessage;
+        Modifiers_cannot_appear_here: DiagnosticMessage;
+        Merge_conflict_marker_encountered: DiagnosticMessage;
+        A_rest_element_cannot_have_an_initializer: DiagnosticMessage;
+        A_parameter_property_may_not_be_declared_using_a_binding_pattern: DiagnosticMessage;
+        Only_a_single_variable_declaration_is_allowed_in_a_for_of_statement: DiagnosticMessage;
+        The_variable_declaration_of_a_for_in_statement_cannot_have_an_initializer: DiagnosticMessage;
+        The_variable_declaration_of_a_for_of_statement_cannot_have_an_initializer: DiagnosticMessage;
+        An_import_declaration_cannot_have_modifiers: DiagnosticMessage;
+        Module_0_has_no_default_export: DiagnosticMessage;
+        An_export_declaration_cannot_have_modifiers: DiagnosticMessage;
+        Export_declarations_are_not_permitted_in_a_namespace: DiagnosticMessage;
+        Catch_clause_variable_cannot_have_a_type_annotation: DiagnosticMessage;
+        Catch_clause_variable_cannot_have_an_initializer: DiagnosticMessage;
+        An_extended_Unicode_escape_value_must_be_between_0x0_and_0x10FFFF_inclusive: DiagnosticMessage;
+        Unterminated_Unicode_escape_sequence: DiagnosticMessage;
+        Line_terminator_not_permitted_before_arrow: DiagnosticMessage;
+        Import_assignment_cannot_be_used_when_targeting_ECMAScript_modules_Consider_using_import_Asterisk_as_ns_from_mod_import_a_from_mod_import_d_from_mod_or_another_module_format_instead: DiagnosticMessage;
+        Export_assignment_cannot_be_used_when_targeting_ECMAScript_modules_Consider_using_export_default_or_another_module_format_instead: DiagnosticMessage;
+        Cannot_re_export_a_type_when_the_isolatedModules_flag_is_provided: DiagnosticMessage;
+        Decorators_are_not_valid_here: DiagnosticMessage;
+        Decorators_cannot_be_applied_to_multiple_get_Slashset_accessors_of_the_same_name: DiagnosticMessage;
+        Cannot_compile_namespaces_when_the_isolatedModules_flag_is_provided: DiagnosticMessage;
+        Ambient_const_enums_are_not_allowed_when_the_isolatedModules_flag_is_provided: DiagnosticMessage;
+        Invalid_use_of_0_Class_definitions_are_automatically_in_strict_mode: DiagnosticMessage;
+        A_class_declaration_without_the_default_modifier_must_have_a_name: DiagnosticMessage;
+        Identifier_expected_0_is_a_reserved_word_in_strict_mode: DiagnosticMessage;
+        Identifier_expected_0_is_a_reserved_word_in_strict_mode_Class_definitions_are_automatically_in_strict_mode: DiagnosticMessage;
+        Identifier_expected_0_is_a_reserved_word_in_strict_mode_Modules_are_automatically_in_strict_mode: DiagnosticMessage;
+        Invalid_use_of_0_Modules_are_automatically_in_strict_mode: DiagnosticMessage;
+        Identifier_expected_esModule_is_reserved_as_an_exported_marker_when_transforming_ECMAScript_modules: DiagnosticMessage;
+        Export_assignment_is_not_supported_when_module_flag_is_system: DiagnosticMessage;
+        Experimental_support_for_decorators_is_a_feature_that_is_subject_to_change_in_a_future_release_Set_the_experimentalDecorators_option_to_remove_this_warning: DiagnosticMessage;
+        Generators_are_only_available_when_targeting_ECMAScript_2015_or_higher: DiagnosticMessage;
+        Generators_are_not_allowed_in_an_ambient_context: DiagnosticMessage;
+        An_overload_signature_cannot_be_declared_as_a_generator: DiagnosticMessage;
+        _0_tag_already_specified: DiagnosticMessage;
+        Signature_0_must_be_a_type_predicate: DiagnosticMessage;
+        Cannot_find_parameter_0: DiagnosticMessage;
+        Type_predicate_0_is_not_assignable_to_1: DiagnosticMessage;
+        Parameter_0_is_not_in_the_same_position_as_parameter_1: DiagnosticMessage;
+        A_type_predicate_is_only_allowed_in_return_type_position_for_functions_and_methods: DiagnosticMessage;
+        A_type_predicate_cannot_reference_a_rest_parameter: DiagnosticMessage;
+        A_type_predicate_cannot_reference_element_0_in_a_binding_pattern: DiagnosticMessage;
+        An_export_assignment_can_only_be_used_in_a_module: DiagnosticMessage;
+        An_import_declaration_can_only_be_used_in_a_namespace_or_module: DiagnosticMessage;
+        An_export_declaration_can_only_be_used_in_a_module: DiagnosticMessage;
+        An_ambient_module_declaration_is_only_allowed_at_the_top_level_in_a_file: DiagnosticMessage;
+        A_namespace_declaration_is_only_allowed_in_a_namespace_or_module: DiagnosticMessage;
+        The_return_type_of_a_property_decorator_function_must_be_either_void_or_any: DiagnosticMessage;
+        The_return_type_of_a_parameter_decorator_function_must_be_either_void_or_any: DiagnosticMessage;
+        Unable_to_resolve_signature_of_class_decorator_when_called_as_an_expression: DiagnosticMessage;
+        Unable_to_resolve_signature_of_parameter_decorator_when_called_as_an_expression: DiagnosticMessage;
+        Unable_to_resolve_signature_of_property_decorator_when_called_as_an_expression: DiagnosticMessage;
+        Unable_to_resolve_signature_of_method_decorator_when_called_as_an_expression: DiagnosticMessage;
+        abstract_modifier_can_only_appear_on_a_class_method_or_property_declaration: DiagnosticMessage;
+        _0_modifier_cannot_be_used_with_1_modifier: DiagnosticMessage;
+        Abstract_methods_can_only_appear_within_an_abstract_class: DiagnosticMessage;
+        Method_0_cannot_have_an_implementation_because_it_is_marked_abstract: DiagnosticMessage;
+        An_interface_property_cannot_have_an_initializer: DiagnosticMessage;
+        A_type_literal_property_cannot_have_an_initializer: DiagnosticMessage;
+        A_class_member_cannot_have_the_0_keyword: DiagnosticMessage;
+        A_decorator_can_only_decorate_a_method_implementation_not_an_overload: DiagnosticMessage;
+        Function_declarations_are_not_allowed_inside_blocks_in_strict_mode_when_targeting_ES3_or_ES5: DiagnosticMessage;
+        Function_declarations_are_not_allowed_inside_blocks_in_strict_mode_when_targeting_ES3_or_ES5_Class_definitions_are_automatically_in_strict_mode: DiagnosticMessage;
+        Function_declarations_are_not_allowed_inside_blocks_in_strict_mode_when_targeting_ES3_or_ES5_Modules_are_automatically_in_strict_mode: DiagnosticMessage;
+        _0_tag_cannot_be_used_independently_as_a_top_level_JSDoc_tag: DiagnosticMessage;
+        A_const_initializer_in_an_ambient_context_must_be_a_string_or_numeric_literal: DiagnosticMessage;
+        A_definite_assignment_assertion_is_not_permitted_in_this_context: DiagnosticMessage;
+        with_statements_are_not_allowed_in_an_async_function_block: DiagnosticMessage;
+        await_expression_is_only_allowed_within_an_async_function: DiagnosticMessage;
+        can_only_be_used_in_an_object_literal_property_inside_a_destructuring_assignment: DiagnosticMessage;
+        The_body_of_an_if_statement_cannot_be_the_empty_statement: DiagnosticMessage;
+        Global_module_exports_may_only_appear_in_module_files: DiagnosticMessage;
+        Global_module_exports_may_only_appear_in_declaration_files: DiagnosticMessage;
+        Global_module_exports_may_only_appear_at_top_level: DiagnosticMessage;
+        A_parameter_property_cannot_be_declared_using_a_rest_parameter: DiagnosticMessage;
+        An_abstract_accessor_cannot_have_an_implementation: DiagnosticMessage;
+        A_default_export_can_only_be_used_in_an_ECMAScript_style_module: DiagnosticMessage;
+        Type_of_await_operand_must_either_be_a_valid_promise_or_must_not_contain_a_callable_then_member: DiagnosticMessage;
+        Type_of_yield_operand_in_an_async_generator_must_either_be_a_valid_promise_or_must_not_contain_a_callable_then_member: DiagnosticMessage;
+        Type_of_iterated_elements_of_a_yield_Asterisk_operand_must_either_be_a_valid_promise_or_must_not_contain_a_callable_then_member: DiagnosticMessage;
+        Dynamic_import_is_only_supported_when_module_flag_is_commonjs_or_esNext: DiagnosticMessage;
+        Dynamic_import_must_have_one_specifier_as_an_argument: DiagnosticMessage;
+        Specifier_of_dynamic_import_cannot_be_spread_element: DiagnosticMessage;
+        Dynamic_import_cannot_have_type_arguments: DiagnosticMessage;
+        String_literal_with_double_quotes_expected: DiagnosticMessage;
+        Property_value_can_only_be_string_literal_numeric_literal_true_false_null_object_literal_or_array_literal: DiagnosticMessage;
+        _0_accepts_too_few_arguments_to_be_used_as_a_decorator_here_Did_you_mean_to_call_it_first_and_write_0: DiagnosticMessage;
+        A_property_of_an_interface_or_type_literal_whose_type_is_a_unique_symbol_type_must_be_readonly: DiagnosticMessage;
+        A_property_of_a_class_whose_type_is_a_unique_symbol_type_must_be_both_static_and_readonly: DiagnosticMessage;
+        A_variable_whose_type_is_a_unique_symbol_type_must_be_const: DiagnosticMessage;
+        unique_symbol_types_may_not_be_used_on_a_variable_declaration_with_a_binding_name: DiagnosticMessage;
+        unique_symbol_types_are_only_allowed_on_variables_in_a_variable_statement: DiagnosticMessage;
+        unique_symbol_types_are_not_allowed_here: DiagnosticMessage;
+        An_index_signature_parameter_type_cannot_be_a_type_alias_Consider_writing_0_Colon_1_Colon_2_instead: DiagnosticMessage;
+        An_index_signature_parameter_type_cannot_be_a_union_type_Consider_using_a_mapped_object_type_instead: DiagnosticMessage;
+        infer_declarations_are_only_permitted_in_the_extends_clause_of_a_conditional_type: DiagnosticMessage;
+        Module_0_does_not_refer_to_a_value_but_is_used_as_a_value_here: DiagnosticMessage;
+        Module_0_does_not_refer_to_a_type_but_is_used_as_a_type_here: DiagnosticMessage;
+        Type_arguments_cannot_be_used_here: DiagnosticMessage;
+        The_import_meta_meta_property_is_only_allowed_using_ESNext_for_the_target_and_module_compiler_options: DiagnosticMessage;
+        Duplicate_identifier_0: DiagnosticMessage;
+        Initializer_of_instance_member_variable_0_cannot_reference_identifier_1_declared_in_the_constructor: DiagnosticMessage;
+        Static_members_cannot_reference_class_type_parameters: DiagnosticMessage;
+        Circular_definition_of_import_alias_0: DiagnosticMessage;
+        Cannot_find_name_0: DiagnosticMessage;
+        Module_0_has_no_exported_member_1: DiagnosticMessage;
+        File_0_is_not_a_module: DiagnosticMessage;
+        Cannot_find_module_0: DiagnosticMessage;
+        Module_0_has_already_exported_a_member_named_1_Consider_explicitly_re_exporting_to_resolve_the_ambiguity: DiagnosticMessage;
+        An_export_assignment_cannot_be_used_in_a_module_with_other_exported_elements: DiagnosticMessage;
+        Type_0_recursively_references_itself_as_a_base_type: DiagnosticMessage;
+        A_class_may_only_extend_another_class: DiagnosticMessage;
+        An_interface_may_only_extend_a_class_or_another_interface: DiagnosticMessage;
+        Type_parameter_0_has_a_circular_constraint: DiagnosticMessage;
+        Generic_type_0_requires_1_type_argument_s: DiagnosticMessage;
+        Type_0_is_not_generic: DiagnosticMessage;
+        Global_type_0_must_be_a_class_or_interface_type: DiagnosticMessage;
+        Global_type_0_must_have_1_type_parameter_s: DiagnosticMessage;
+        Cannot_find_global_type_0: DiagnosticMessage;
+        Named_property_0_of_types_1_and_2_are_not_identical: DiagnosticMessage;
+        Interface_0_cannot_simultaneously_extend_types_1_and_2: DiagnosticMessage;
+        Excessive_stack_depth_comparing_types_0_and_1: DiagnosticMessage;
+        Type_0_is_not_assignable_to_type_1: DiagnosticMessage;
+        Cannot_redeclare_exported_variable_0: DiagnosticMessage;
+        Property_0_is_missing_in_type_1: DiagnosticMessage;
+        Property_0_is_private_in_type_1_but_not_in_type_2: DiagnosticMessage;
+        Types_of_property_0_are_incompatible: DiagnosticMessage;
+        Property_0_is_optional_in_type_1_but_required_in_type_2: DiagnosticMessage;
+        Types_of_parameters_0_and_1_are_incompatible: DiagnosticMessage;
+        Index_signature_is_missing_in_type_0: DiagnosticMessage;
+        Index_signatures_are_incompatible: DiagnosticMessage;
+        this_cannot_be_referenced_in_a_module_or_namespace_body: DiagnosticMessage;
+        this_cannot_be_referenced_in_current_location: DiagnosticMessage;
+        this_cannot_be_referenced_in_constructor_arguments: DiagnosticMessage;
+        this_cannot_be_referenced_in_a_static_property_initializer: DiagnosticMessage;
+        super_can_only_be_referenced_in_a_derived_class: DiagnosticMessage;
+        super_cannot_be_referenced_in_constructor_arguments: DiagnosticMessage;
+        Super_calls_are_not_permitted_outside_constructors_or_in_nested_functions_inside_constructors: DiagnosticMessage;
+        super_property_access_is_permitted_only_in_a_constructor_member_function_or_member_accessor_of_a_derived_class: DiagnosticMessage;
+        Property_0_does_not_exist_on_type_1: DiagnosticMessage;
+        Only_public_and_protected_methods_of_the_base_class_are_accessible_via_the_super_keyword: DiagnosticMessage;
+        Property_0_is_private_and_only_accessible_within_class_1: DiagnosticMessage;
+        An_index_expression_argument_must_be_of_type_string_number_symbol_or_any: DiagnosticMessage;
+        This_syntax_requires_an_imported_helper_named_1_but_module_0_has_no_exported_member_1: DiagnosticMessage;
+        Type_0_does_not_satisfy_the_constraint_1: DiagnosticMessage;
+        Argument_of_type_0_is_not_assignable_to_parameter_of_type_1: DiagnosticMessage;
+        Call_target_does_not_contain_any_signatures: DiagnosticMessage;
+        Untyped_function_calls_may_not_accept_type_arguments: DiagnosticMessage;
+        Value_of_type_0_is_not_callable_Did_you_mean_to_include_new: DiagnosticMessage;
+        Cannot_invoke_an_expression_whose_type_lacks_a_call_signature_Type_0_has_no_compatible_call_signatures: DiagnosticMessage;
+        Only_a_void_function_can_be_called_with_the_new_keyword: DiagnosticMessage;
+        Cannot_use_new_with_an_expression_whose_type_lacks_a_call_or_construct_signature: DiagnosticMessage;
+        Type_0_cannot_be_converted_to_type_1: DiagnosticMessage;
+        Object_literal_may_only_specify_known_properties_and_0_does_not_exist_in_type_1: DiagnosticMessage;
+        This_syntax_requires_an_imported_helper_but_module_0_cannot_be_found: DiagnosticMessage;
+        A_function_whose_declared_type_is_neither_void_nor_any_must_return_a_value: DiagnosticMessage;
+        An_arithmetic_operand_must_be_of_type_any_number_or_an_enum_type: DiagnosticMessage;
+        The_operand_of_an_increment_or_decrement_operator_must_be_a_variable_or_a_property_access: DiagnosticMessage;
+        The_left_hand_side_of_an_instanceof_expression_must_be_of_type_any_an_object_type_or_a_type_parameter: DiagnosticMessage;
+        The_right_hand_side_of_an_instanceof_expression_must_be_of_type_any_or_of_a_type_assignable_to_the_Function_interface_type: DiagnosticMessage;
+        The_left_hand_side_of_an_in_expression_must_be_of_type_any_string_number_or_symbol: DiagnosticMessage;
+        The_right_hand_side_of_an_in_expression_must_be_of_type_any_an_object_type_or_a_type_parameter: DiagnosticMessage;
+        The_left_hand_side_of_an_arithmetic_operation_must_be_of_type_any_number_or_an_enum_type: DiagnosticMessage;
+        The_right_hand_side_of_an_arithmetic_operation_must_be_of_type_any_number_or_an_enum_type: DiagnosticMessage;
+        The_left_hand_side_of_an_assignment_expression_must_be_a_variable_or_a_property_access: DiagnosticMessage;
+        Operator_0_cannot_be_applied_to_types_1_and_2: DiagnosticMessage;
+        Function_lacks_ending_return_statement_and_return_type_does_not_include_undefined: DiagnosticMessage;
+        Type_parameter_name_cannot_be_0: DiagnosticMessage;
+        A_parameter_property_is_only_allowed_in_a_constructor_implementation: DiagnosticMessage;
+        A_rest_parameter_must_be_of_an_array_type: DiagnosticMessage;
+        A_parameter_initializer_is_only_allowed_in_a_function_or_constructor_implementation: DiagnosticMessage;
+        Parameter_0_cannot_be_referenced_in_its_initializer: DiagnosticMessage;
+        Initializer_of_parameter_0_cannot_reference_identifier_1_declared_after_it: DiagnosticMessage;
+        Duplicate_string_index_signature: DiagnosticMessage;
+        Duplicate_number_index_signature: DiagnosticMessage;
+        A_super_call_must_be_the_first_statement_in_the_constructor_when_a_class_contains_initialized_properties_or_has_parameter_properties: DiagnosticMessage;
+        Constructors_for_derived_classes_must_contain_a_super_call: DiagnosticMessage;
+        A_get_accessor_must_return_a_value: DiagnosticMessage;
+        Getter_and_setter_accessors_do_not_agree_in_visibility: DiagnosticMessage;
+        get_and_set_accessor_must_have_the_same_type: DiagnosticMessage;
+        A_signature_with_an_implementation_cannot_use_a_string_literal_type: DiagnosticMessage;
+        Specialized_overload_signature_is_not_assignable_to_any_non_specialized_signature: DiagnosticMessage;
+        Overload_signatures_must_all_be_exported_or_non_exported: DiagnosticMessage;
+        Overload_signatures_must_all_be_ambient_or_non_ambient: DiagnosticMessage;
+        Overload_signatures_must_all_be_public_private_or_protected: DiagnosticMessage;
+        Overload_signatures_must_all_be_optional_or_required: DiagnosticMessage;
+        Function_overload_must_be_static: DiagnosticMessage;
+        Function_overload_must_not_be_static: DiagnosticMessage;
+        Function_implementation_name_must_be_0: DiagnosticMessage;
+        Constructor_implementation_is_missing: DiagnosticMessage;
+        Function_implementation_is_missing_or_not_immediately_following_the_declaration: DiagnosticMessage;
+        Multiple_constructor_implementations_are_not_allowed: DiagnosticMessage;
+        Duplicate_function_implementation: DiagnosticMessage;
+        Overload_signature_is_not_compatible_with_function_implementation: DiagnosticMessage;
+        Individual_declarations_in_merged_declaration_0_must_be_all_exported_or_all_local: DiagnosticMessage;
+        Duplicate_identifier_arguments_Compiler_uses_arguments_to_initialize_rest_parameters: DiagnosticMessage;
+        Declaration_name_conflicts_with_built_in_global_identifier_0: DiagnosticMessage;
+        Duplicate_identifier_this_Compiler_uses_variable_declaration_this_to_capture_this_reference: DiagnosticMessage;
+        Expression_resolves_to_variable_declaration_this_that_compiler_uses_to_capture_this_reference: DiagnosticMessage;
+        Duplicate_identifier_super_Compiler_uses_super_to_capture_base_class_reference: DiagnosticMessage;
+        Expression_resolves_to_super_that_compiler_uses_to_capture_base_class_reference: DiagnosticMessage;
+        Subsequent_variable_declarations_must_have_the_same_type_Variable_0_must_be_of_type_1_but_here_has_type_2: DiagnosticMessage;
+        The_left_hand_side_of_a_for_in_statement_cannot_use_a_type_annotation: DiagnosticMessage;
+        The_left_hand_side_of_a_for_in_statement_must_be_of_type_string_or_any: DiagnosticMessage;
+        The_left_hand_side_of_a_for_in_statement_must_be_a_variable_or_a_property_access: DiagnosticMessage;
+        The_right_hand_side_of_a_for_in_statement_must_be_of_type_any_an_object_type_or_a_type_parameter_but_here_has_type_0: DiagnosticMessage;
+        Setters_cannot_return_a_value: DiagnosticMessage;
+        Return_type_of_constructor_signature_must_be_assignable_to_the_instance_type_of_the_class: DiagnosticMessage;
+        The_with_statement_is_not_supported_All_symbols_in_a_with_block_will_have_type_any: DiagnosticMessage;
+        Property_0_of_type_1_is_not_assignable_to_string_index_type_2: DiagnosticMessage;
+        Property_0_of_type_1_is_not_assignable_to_numeric_index_type_2: DiagnosticMessage;
+        Numeric_index_type_0_is_not_assignable_to_string_index_type_1: DiagnosticMessage;
+        Class_name_cannot_be_0: DiagnosticMessage;
+        Class_0_incorrectly_extends_base_class_1: DiagnosticMessage;
+        Property_0_in_type_1_is_not_assignable_to_the_same_property_in_base_type_2: DiagnosticMessage;
+        Class_static_side_0_incorrectly_extends_base_class_static_side_1: DiagnosticMessage;
+        Class_0_incorrectly_implements_interface_1: DiagnosticMessage;
+        A_class_may_only_implement_another_class_or_interface: DiagnosticMessage;
+        Class_0_defines_instance_member_function_1_but_extended_class_2_defines_it_as_instance_member_accessor: DiagnosticMessage;
+        Class_0_defines_instance_member_function_1_but_extended_class_2_defines_it_as_instance_member_property: DiagnosticMessage;
+        Class_0_defines_instance_member_property_1_but_extended_class_2_defines_it_as_instance_member_function: DiagnosticMessage;
+        Class_0_defines_instance_member_accessor_1_but_extended_class_2_defines_it_as_instance_member_function: DiagnosticMessage;
+        Interface_name_cannot_be_0: DiagnosticMessage;
+        All_declarations_of_0_must_have_identical_type_parameters: DiagnosticMessage;
+        Interface_0_incorrectly_extends_interface_1: DiagnosticMessage;
+        Enum_name_cannot_be_0: DiagnosticMessage;
+        In_an_enum_with_multiple_declarations_only_one_declaration_can_omit_an_initializer_for_its_first_enum_element: DiagnosticMessage;
+        A_namespace_declaration_cannot_be_in_a_different_file_from_a_class_or_function_with_which_it_is_merged: DiagnosticMessage;
+        A_namespace_declaration_cannot_be_located_prior_to_a_class_or_function_with_which_it_is_merged: DiagnosticMessage;
+        Ambient_modules_cannot_be_nested_in_other_modules_or_namespaces: DiagnosticMessage;
+        Ambient_module_declaration_cannot_specify_relative_module_name: DiagnosticMessage;
+        Module_0_is_hidden_by_a_local_declaration_with_the_same_name: DiagnosticMessage;
+        Import_name_cannot_be_0: DiagnosticMessage;
+        Import_or_export_declaration_in_an_ambient_module_declaration_cannot_reference_module_through_relative_module_name: DiagnosticMessage;
+        Import_declaration_conflicts_with_local_declaration_of_0: DiagnosticMessage;
+        Duplicate_identifier_0_Compiler_reserves_name_1_in_top_level_scope_of_a_module: DiagnosticMessage;
+        Types_have_separate_declarations_of_a_private_property_0: DiagnosticMessage;
+        Property_0_is_protected_but_type_1_is_not_a_class_derived_from_2: DiagnosticMessage;
+        Property_0_is_protected_in_type_1_but_public_in_type_2: DiagnosticMessage;
+        Property_0_is_protected_and_only_accessible_within_class_1_and_its_subclasses: DiagnosticMessage;
+        Property_0_is_protected_and_only_accessible_through_an_instance_of_class_1: DiagnosticMessage;
+        The_0_operator_is_not_allowed_for_boolean_types_Consider_using_1_instead: DiagnosticMessage;
+        Block_scoped_variable_0_used_before_its_declaration: DiagnosticMessage;
+        Class_0_used_before_its_declaration: DiagnosticMessage;
+        Enum_0_used_before_its_declaration: DiagnosticMessage;
+        Cannot_redeclare_block_scoped_variable_0: DiagnosticMessage;
+        An_enum_member_cannot_have_a_numeric_name: DiagnosticMessage;
+        The_type_argument_for_type_parameter_0_cannot_be_inferred_from_the_usage_Consider_specifying_the_type_arguments_explicitly: DiagnosticMessage;
+        Variable_0_is_used_before_being_assigned: DiagnosticMessage;
+        Type_argument_candidate_1_is_not_a_valid_type_argument_because_it_is_not_a_supertype_of_candidate_0: DiagnosticMessage;
+        Type_alias_0_circularly_references_itself: DiagnosticMessage;
+        Type_alias_name_cannot_be_0: DiagnosticMessage;
+        An_AMD_module_cannot_have_multiple_name_assignments: DiagnosticMessage;
+        Type_0_has_no_property_1_and_no_string_index_signature: DiagnosticMessage;
+        Type_0_has_no_property_1: DiagnosticMessage;
+        Type_0_is_not_an_array_type: DiagnosticMessage;
+        A_rest_element_must_be_last_in_a_destructuring_pattern: DiagnosticMessage;
+        A_binding_pattern_parameter_cannot_be_optional_in_an_implementation_signature: DiagnosticMessage;
+        A_computed_property_name_must_be_of_type_string_number_symbol_or_any: DiagnosticMessage;
+        this_cannot_be_referenced_in_a_computed_property_name: DiagnosticMessage;
+        super_cannot_be_referenced_in_a_computed_property_name: DiagnosticMessage;
+        A_computed_property_name_cannot_reference_a_type_parameter_from_its_containing_type: DiagnosticMessage;
+        Cannot_find_global_value_0: DiagnosticMessage;
+        The_0_operator_cannot_be_applied_to_type_symbol: DiagnosticMessage;
+        Symbol_reference_does_not_refer_to_the_global_Symbol_constructor_object: DiagnosticMessage;
+        A_computed_property_name_of_the_form_0_must_be_of_type_symbol: DiagnosticMessage;
+        Spread_operator_in_new_expressions_is_only_available_when_targeting_ECMAScript_5_and_higher: DiagnosticMessage;
+        Enum_declarations_must_all_be_const_or_non_const: DiagnosticMessage;
+        In_const_enum_declarations_member_initializer_must_be_constant_expression: DiagnosticMessage;
+        const_enums_can_only_be_used_in_property_or_index_access_expressions_or_the_right_hand_side_of_an_import_declaration_or_export_assignment_or_type_query: DiagnosticMessage;
+        A_const_enum_member_can_only_be_accessed_using_a_string_literal: DiagnosticMessage;
+        const_enum_member_initializer_was_evaluated_to_a_non_finite_value: DiagnosticMessage;
+        const_enum_member_initializer_was_evaluated_to_disallowed_value_NaN: DiagnosticMessage;
+        Property_0_does_not_exist_on_const_enum_1: DiagnosticMessage;
+        let_is_not_allowed_to_be_used_as_a_name_in_let_or_const_declarations: DiagnosticMessage;
+        Cannot_initialize_outer_scoped_variable_0_in_the_same_scope_as_block_scoped_declaration_1: DiagnosticMessage;
+        The_left_hand_side_of_a_for_of_statement_cannot_use_a_type_annotation: DiagnosticMessage;
+        Export_declaration_conflicts_with_exported_declaration_of_0: DiagnosticMessage;
+        The_left_hand_side_of_a_for_of_statement_must_be_a_variable_or_a_property_access: DiagnosticMessage;
+        Type_0_must_have_a_Symbol_iterator_method_that_returns_an_iterator: DiagnosticMessage;
+        An_iterator_must_have_a_next_method: DiagnosticMessage;
+        The_type_returned_by_the_next_method_of_an_iterator_must_have_a_value_property: DiagnosticMessage;
+        The_left_hand_side_of_a_for_in_statement_cannot_be_a_destructuring_pattern: DiagnosticMessage;
+        Cannot_redeclare_identifier_0_in_catch_clause: DiagnosticMessage;
+        Tuple_type_0_with_length_1_cannot_be_assigned_to_tuple_with_length_2: DiagnosticMessage;
+        Using_a_string_in_a_for_of_statement_is_only_supported_in_ECMAScript_5_and_higher: DiagnosticMessage;
+        Type_0_is_not_an_array_type_or_a_string_type: DiagnosticMessage;
+        The_arguments_object_cannot_be_referenced_in_an_arrow_function_in_ES3_and_ES5_Consider_using_a_standard_function_expression: DiagnosticMessage;
+        Module_0_resolves_to_a_non_module_entity_and_cannot_be_imported_using_this_construct: DiagnosticMessage;
+        Module_0_uses_export_and_cannot_be_used_with_export_Asterisk: DiagnosticMessage;
+        An_interface_can_only_extend_an_identifier_Slashqualified_name_with_optional_type_arguments: DiagnosticMessage;
+        A_class_can_only_implement_an_identifier_Slashqualified_name_with_optional_type_arguments: DiagnosticMessage;
+        A_rest_element_cannot_contain_a_binding_pattern: DiagnosticMessage;
+        _0_is_referenced_directly_or_indirectly_in_its_own_type_annotation: DiagnosticMessage;
+        Cannot_find_namespace_0: DiagnosticMessage;
+        Type_0_must_have_a_Symbol_asyncIterator_method_that_returns_an_async_iterator: DiagnosticMessage;
+        A_generator_cannot_have_a_void_type_annotation: DiagnosticMessage;
+        _0_is_referenced_directly_or_indirectly_in_its_own_base_expression: DiagnosticMessage;
+        Type_0_is_not_a_constructor_function_type: DiagnosticMessage;
+        No_base_constructor_has_the_specified_number_of_type_arguments: DiagnosticMessage;
+        Base_constructor_return_type_0_is_not_a_class_or_interface_type: DiagnosticMessage;
+        Base_constructors_must_all_have_the_same_return_type: DiagnosticMessage;
+        Cannot_create_an_instance_of_an_abstract_class: DiagnosticMessage;
+        Overload_signatures_must_all_be_abstract_or_non_abstract: DiagnosticMessage;
+        Abstract_method_0_in_class_1_cannot_be_accessed_via_super_expression: DiagnosticMessage;
+        Classes_containing_abstract_methods_must_be_marked_abstract: DiagnosticMessage;
+        Non_abstract_class_0_does_not_implement_inherited_abstract_member_1_from_class_2: DiagnosticMessage;
+        All_declarations_of_an_abstract_method_must_be_consecutive: DiagnosticMessage;
+        Cannot_assign_an_abstract_constructor_type_to_a_non_abstract_constructor_type: DiagnosticMessage;
+        A_this_based_type_guard_is_not_compatible_with_a_parameter_based_type_guard: DiagnosticMessage;
+        An_async_iterator_must_have_a_next_method: DiagnosticMessage;
+        Duplicate_identifier_0_Compiler_uses_declaration_1_to_support_async_functions: DiagnosticMessage;
+        Expression_resolves_to_variable_declaration_0_that_compiler_uses_to_support_async_functions: DiagnosticMessage;
+        The_arguments_object_cannot_be_referenced_in_an_async_function_or_method_in_ES3_and_ES5_Consider_using_a_standard_function_or_method: DiagnosticMessage;
+        yield_expressions_cannot_be_used_in_a_parameter_initializer: DiagnosticMessage;
+        await_expressions_cannot_be_used_in_a_parameter_initializer: DiagnosticMessage;
+        Initializer_provides_no_value_for_this_binding_element_and_the_binding_element_has_no_default_value: DiagnosticMessage;
+        A_this_type_is_available_only_in_a_non_static_member_of_a_class_or_interface: DiagnosticMessage;
+        The_inferred_type_of_0_references_an_inaccessible_1_type_A_type_annotation_is_necessary: DiagnosticMessage;
+        A_module_cannot_have_multiple_default_exports: DiagnosticMessage;
+        Duplicate_identifier_0_Compiler_reserves_name_1_in_top_level_scope_of_a_module_containing_async_functions: DiagnosticMessage;
+        Property_0_is_incompatible_with_index_signature: DiagnosticMessage;
+        Object_is_possibly_null: DiagnosticMessage;
+        Object_is_possibly_undefined: DiagnosticMessage;
+        Object_is_possibly_null_or_undefined: DiagnosticMessage;
+        A_function_returning_never_cannot_have_a_reachable_end_point: DiagnosticMessage;
+        Enum_type_0_has_members_with_initializers_that_are_not_literals: DiagnosticMessage;
+        Type_0_cannot_be_used_to_index_type_1: DiagnosticMessage;
+        Type_0_has_no_matching_index_signature_for_type_1: DiagnosticMessage;
+        Type_0_cannot_be_used_as_an_index_type: DiagnosticMessage;
+        Cannot_assign_to_0_because_it_is_not_a_variable: DiagnosticMessage;
+        Cannot_assign_to_0_because_it_is_a_constant_or_a_read_only_property: DiagnosticMessage;
+        The_target_of_an_assignment_must_be_a_variable_or_a_property_access: DiagnosticMessage;
+        Index_signature_in_type_0_only_permits_reading: DiagnosticMessage;
+        Duplicate_identifier_newTarget_Compiler_uses_variable_declaration_newTarget_to_capture_new_target_meta_property_reference: DiagnosticMessage;
+        Expression_resolves_to_variable_declaration_newTarget_that_compiler_uses_to_capture_new_target_meta_property_reference: DiagnosticMessage;
+        A_mixin_class_must_have_a_constructor_with_a_single_rest_parameter_of_type_any: DiagnosticMessage;
+        Property_0_has_conflicting_declarations_and_is_inaccessible_in_type_1: DiagnosticMessage;
+        The_type_returned_by_the_next_method_of_an_async_iterator_must_be_a_promise_for_a_type_with_a_value_property: DiagnosticMessage;
+        Type_0_is_not_an_array_type_or_does_not_have_a_Symbol_iterator_method_that_returns_an_iterator: DiagnosticMessage;
+        Type_0_is_not_an_array_type_or_a_string_type_or_does_not_have_a_Symbol_iterator_method_that_returns_an_iterator: DiagnosticMessage;
+        Generic_type_instantiation_is_excessively_deep_and_possibly_infinite: DiagnosticMessage;
+        Property_0_does_not_exist_on_type_1_Did_you_mean_2: DiagnosticMessage;
+        Cannot_find_name_0_Did_you_mean_1: DiagnosticMessage;
+        Computed_values_are_not_permitted_in_an_enum_with_string_valued_members: DiagnosticMessage;
+        Expected_0_arguments_but_got_1: DiagnosticMessage;
+        Expected_at_least_0_arguments_but_got_1: DiagnosticMessage;
+        Expected_0_arguments_but_got_1_or_more: DiagnosticMessage;
+        Expected_at_least_0_arguments_but_got_1_or_more: DiagnosticMessage;
+        Expected_0_type_arguments_but_got_1: DiagnosticMessage;
+        Type_0_has_no_properties_in_common_with_type_1: DiagnosticMessage;
+        Value_of_type_0_has_no_properties_in_common_with_type_1_Did_you_mean_to_call_it: DiagnosticMessage;
+        Object_literal_may_only_specify_known_properties_but_0_does_not_exist_in_type_1_Did_you_mean_to_write_2: DiagnosticMessage;
+        Base_class_expressions_cannot_reference_class_type_parameters: DiagnosticMessage;
+        The_containing_function_or_module_body_is_too_large_for_control_flow_analysis: DiagnosticMessage;
+        Property_0_has_no_initializer_and_is_not_definitely_assigned_in_the_constructor: DiagnosticMessage;
+        Property_0_is_used_before_being_assigned: DiagnosticMessage;
+        A_rest_element_cannot_have_a_property_name: DiagnosticMessage;
+        Enum_declarations_can_only_merge_with_namespace_or_other_enum_declarations: DiagnosticMessage;
+        Type_0_is_not_an_array_type_Use_compiler_option_downlevelIteration_to_allow_iterating_of_iterators: DiagnosticMessage;
+        Type_0_is_not_an_array_type_or_a_string_type_Use_compiler_option_downlevelIteration_to_allow_iterating_of_iterators: DiagnosticMessage;
+        Property_0_does_not_exist_on_type_1_Did_you_forget_to_use_await: DiagnosticMessage;
+        Object_is_of_type_unknown: DiagnosticMessage;
+        JSX_element_attributes_type_0_may_not_be_a_union_type: DiagnosticMessage;
+        The_return_type_of_a_JSX_element_constructor_must_return_an_object_type: DiagnosticMessage;
+        JSX_element_implicitly_has_type_any_because_the_global_type_JSX_Element_does_not_exist: DiagnosticMessage;
+        Property_0_in_type_1_is_not_assignable_to_type_2: DiagnosticMessage;
+        JSX_element_type_0_does_not_have_any_construct_or_call_signatures: DiagnosticMessage;
+        JSX_element_type_0_is_not_a_constructor_function_for_JSX_elements: DiagnosticMessage;
+        Property_0_of_JSX_spread_attribute_is_not_assignable_to_target_property: DiagnosticMessage;
+        JSX_element_class_does_not_support_attributes_because_it_does_not_have_a_0_property: DiagnosticMessage;
+        The_global_type_JSX_0_may_not_have_more_than_one_property: DiagnosticMessage;
+        JSX_spread_child_must_be_an_array_type: DiagnosticMessage;
+        Cannot_augment_module_0_with_value_exports_because_it_resolves_to_a_non_module_entity: DiagnosticMessage;
+        A_member_initializer_in_a_enum_declaration_cannot_reference_members_declared_after_it_including_members_defined_in_other_enums: DiagnosticMessage;
+        Merged_declaration_0_cannot_include_a_default_export_declaration_Consider_adding_a_separate_export_default_0_declaration_instead: DiagnosticMessage;
+        Non_abstract_class_expression_does_not_implement_inherited_abstract_member_0_from_class_1: DiagnosticMessage;
+        Exported_external_package_typings_file_cannot_contain_tripleslash_references_Please_contact_the_package_author_to_update_the_package_definition: DiagnosticMessage;
+        Exported_external_package_typings_file_0_is_not_a_module_Please_contact_the_package_author_to_update_the_package_definition: DiagnosticMessage;
+        JSX_expressions_must_have_one_parent_element: DiagnosticMessage;
+        Type_0_provides_no_match_for_the_signature_1: DiagnosticMessage;
+        super_is_only_allowed_in_members_of_object_literal_expressions_when_option_target_is_ES2015_or_higher: DiagnosticMessage;
+        super_can_only_be_referenced_in_members_of_derived_classes_or_object_literal_expressions: DiagnosticMessage;
+        Cannot_export_0_Only_local_declarations_can_be_exported_from_a_module: DiagnosticMessage;
+        Cannot_find_name_0_Did_you_mean_the_static_member_1_0: DiagnosticMessage;
+        Cannot_find_name_0_Did_you_mean_the_instance_member_this_0: DiagnosticMessage;
+        Invalid_module_name_in_augmentation_module_0_cannot_be_found: DiagnosticMessage;
+        Invalid_module_name_in_augmentation_Module_0_resolves_to_an_untyped_module_at_1_which_cannot_be_augmented: DiagnosticMessage;
+        Exports_and_export_assignments_are_not_permitted_in_module_augmentations: DiagnosticMessage;
+        Imports_are_not_permitted_in_module_augmentations_Consider_moving_them_to_the_enclosing_external_module: DiagnosticMessage;
+        export_modifier_cannot_be_applied_to_ambient_modules_and_module_augmentations_since_they_are_always_visible: DiagnosticMessage;
+        Augmentations_for_the_global_scope_can_only_be_directly_nested_in_external_modules_or_ambient_module_declarations: DiagnosticMessage;
+        Augmentations_for_the_global_scope_should_have_declare_modifier_unless_they_appear_in_already_ambient_context: DiagnosticMessage;
+        Cannot_augment_module_0_because_it_resolves_to_a_non_module_entity: DiagnosticMessage;
+        Cannot_assign_a_0_constructor_type_to_a_1_constructor_type: DiagnosticMessage;
+        Constructor_of_class_0_is_private_and_only_accessible_within_the_class_declaration: DiagnosticMessage;
+        Constructor_of_class_0_is_protected_and_only_accessible_within_the_class_declaration: DiagnosticMessage;
+        Cannot_extend_a_class_0_Class_constructor_is_marked_as_private: DiagnosticMessage;
+        Accessors_must_both_be_abstract_or_non_abstract: DiagnosticMessage;
+        A_type_predicate_s_type_must_be_assignable_to_its_parameter_s_type: DiagnosticMessage;
+        Type_0_is_not_comparable_to_type_1: DiagnosticMessage;
+        A_function_that_is_called_with_the_new_keyword_cannot_have_a_this_type_that_is_void: DiagnosticMessage;
+        A_0_parameter_must_be_the_first_parameter: DiagnosticMessage;
+        A_constructor_cannot_have_a_this_parameter: DiagnosticMessage;
+        get_and_set_accessor_must_have_the_same_this_type: DiagnosticMessage;
+        this_implicitly_has_type_any_because_it_does_not_have_a_type_annotation: DiagnosticMessage;
+        The_this_context_of_type_0_is_not_assignable_to_method_s_this_of_type_1: DiagnosticMessage;
+        The_this_types_of_each_signature_are_incompatible: DiagnosticMessage;
+        _0_refers_to_a_UMD_global_but_the_current_file_is_a_module_Consider_adding_an_import_instead: DiagnosticMessage;
+        All_declarations_of_0_must_have_identical_modifiers: DiagnosticMessage;
+        Cannot_find_type_definition_file_for_0: DiagnosticMessage;
+        Cannot_extend_an_interface_0_Did_you_mean_implements: DiagnosticMessage;
+        An_import_path_cannot_end_with_a_0_extension_Consider_importing_1_instead: DiagnosticMessage;
+        _0_is_a_primitive_but_1_is_a_wrapper_object_Prefer_using_0_when_possible: DiagnosticMessage;
+        _0_only_refers_to_a_type_but_is_being_used_as_a_value_here: DiagnosticMessage;
+        Namespace_0_has_no_exported_member_1: DiagnosticMessage;
+        Left_side_of_comma_operator_is_unused_and_has_no_side_effects: DiagnosticMessage;
+        The_Object_type_is_assignable_to_very_few_other_types_Did_you_mean_to_use_the_any_type_instead: DiagnosticMessage;
+        An_async_function_or_method_must_return_a_Promise_Make_sure_you_have_a_declaration_for_Promise_or_include_ES2015_in_your_lib_option: DiagnosticMessage;
+        Spread_types_may_only_be_created_from_object_types: DiagnosticMessage;
+        Static_property_0_conflicts_with_built_in_property_Function_0_of_constructor_function_1: DiagnosticMessage;
+        Rest_types_may_only_be_created_from_object_types: DiagnosticMessage;
+        The_target_of_an_object_rest_assignment_must_be_a_variable_or_a_property_access: DiagnosticMessage;
+        _0_only_refers_to_a_type_but_is_being_used_as_a_namespace_here: DiagnosticMessage;
+        The_operand_of_a_delete_operator_must_be_a_property_reference: DiagnosticMessage;
+        The_operand_of_a_delete_operator_cannot_be_a_read_only_property: DiagnosticMessage;
+        An_async_function_or_method_in_ES5_SlashES3_requires_the_Promise_constructor_Make_sure_you_have_a_declaration_for_the_Promise_constructor_or_include_ES2015_in_your_lib_option: DiagnosticMessage;
+        Required_type_parameters_may_not_follow_optional_type_parameters: DiagnosticMessage;
+        Generic_type_0_requires_between_1_and_2_type_arguments: DiagnosticMessage;
+        Cannot_use_namespace_0_as_a_value: DiagnosticMessage;
+        Cannot_use_namespace_0_as_a_type: DiagnosticMessage;
+        _0_are_specified_twice_The_attribute_named_0_will_be_overwritten: DiagnosticMessage;
+        A_dynamic_import_call_returns_a_Promise_Make_sure_you_have_a_declaration_for_Promise_or_include_ES2015_in_your_lib_option: DiagnosticMessage;
+        A_dynamic_import_call_in_ES5_SlashES3_requires_the_Promise_constructor_Make_sure_you_have_a_declaration_for_the_Promise_constructor_or_include_ES2015_in_your_lib_option: DiagnosticMessage;
+        Cannot_access_0_1_because_0_is_a_type_but_not_a_namespace_Did_you_mean_to_retrieve_the_type_of_the_property_1_in_0_with_0_1: DiagnosticMessage;
+        The_expression_of_an_export_assignment_must_be_an_identifier_or_qualified_name_in_an_ambient_context: DiagnosticMessage;
+        Abstract_property_0_in_class_1_cannot_be_accessed_in_the_constructor: DiagnosticMessage;
+        Type_parameter_0_has_a_circular_default: DiagnosticMessage;
+        Subsequent_property_declarations_must_have_the_same_type_Property_0_must_be_of_type_1_but_here_has_type_2: DiagnosticMessage;
+        Duplicate_declaration_0: DiagnosticMessage;
+        Type_0_is_not_assignable_to_type_1_Two_different_types_with_this_name_exist_but_they_are_unrelated: DiagnosticMessage;
+        Class_0_incorrectly_implements_class_1_Did_you_mean_to_extend_1_and_inherit_its_members_as_a_subclass: DiagnosticMessage;
+        Cannot_invoke_an_object_which_is_possibly_null: DiagnosticMessage;
+        Cannot_invoke_an_object_which_is_possibly_undefined: DiagnosticMessage;
+        Cannot_invoke_an_object_which_is_possibly_null_or_undefined: DiagnosticMessage;
+        Module_0_has_no_exported_member_1_Did_you_mean_2: DiagnosticMessage;
+        Class_name_cannot_be_Object_when_targeting_ES5_with_module_0: DiagnosticMessage;
+        Cannot_find_lib_definition_for_0: DiagnosticMessage;
+        Cannot_find_lib_definition_for_0_Did_you_mean_1: DiagnosticMessage;
+        Import_declaration_0_is_using_private_name_1: DiagnosticMessage;
+        Type_parameter_0_of_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
+        Type_parameter_0_of_exported_interface_has_or_is_using_private_name_1: DiagnosticMessage;
+        Type_parameter_0_of_constructor_signature_from_exported_interface_has_or_is_using_private_name_1: DiagnosticMessage;
+        Type_parameter_0_of_call_signature_from_exported_interface_has_or_is_using_private_name_1: DiagnosticMessage;
+        Type_parameter_0_of_public_static_method_from_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
+        Type_parameter_0_of_public_method_from_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
+        Type_parameter_0_of_method_from_exported_interface_has_or_is_using_private_name_1: DiagnosticMessage;
+        Type_parameter_0_of_exported_function_has_or_is_using_private_name_1: DiagnosticMessage;
+        Implements_clause_of_exported_class_0_has_or_is_using_private_name_1: DiagnosticMessage;
+        extends_clause_of_exported_class_0_has_or_is_using_private_name_1: DiagnosticMessage;
+        extends_clause_of_exported_interface_0_has_or_is_using_private_name_1: DiagnosticMessage;
+        Exported_variable_0_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: DiagnosticMessage;
+        Exported_variable_0_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Exported_variable_0_has_or_is_using_private_name_1: DiagnosticMessage;
+        Public_static_property_0_of_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: DiagnosticMessage;
+        Public_static_property_0_of_exported_class_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Public_static_property_0_of_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
+        Public_property_0_of_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: DiagnosticMessage;
+        Public_property_0_of_exported_class_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Public_property_0_of_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
+        Property_0_of_exported_interface_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Property_0_of_exported_interface_has_or_is_using_private_name_1: DiagnosticMessage;
+        Parameter_type_of_public_static_setter_0_from_exported_class_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Parameter_type_of_public_static_setter_0_from_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
+        Parameter_type_of_public_setter_0_from_exported_class_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Parameter_type_of_public_setter_0_from_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
+        Return_type_of_public_static_getter_0_from_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: DiagnosticMessage;
+        Return_type_of_public_static_getter_0_from_exported_class_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Return_type_of_public_static_getter_0_from_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
+        Return_type_of_public_getter_0_from_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: DiagnosticMessage;
+        Return_type_of_public_getter_0_from_exported_class_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Return_type_of_public_getter_0_from_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
+        Return_type_of_constructor_signature_from_exported_interface_has_or_is_using_name_0_from_private_module_1: DiagnosticMessage;
+        Return_type_of_constructor_signature_from_exported_interface_has_or_is_using_private_name_0: DiagnosticMessage;
+        Return_type_of_call_signature_from_exported_interface_has_or_is_using_name_0_from_private_module_1: DiagnosticMessage;
+        Return_type_of_call_signature_from_exported_interface_has_or_is_using_private_name_0: DiagnosticMessage;
+        Return_type_of_index_signature_from_exported_interface_has_or_is_using_name_0_from_private_module_1: DiagnosticMessage;
+        Return_type_of_index_signature_from_exported_interface_has_or_is_using_private_name_0: DiagnosticMessage;
+        Return_type_of_public_static_method_from_exported_class_has_or_is_using_name_0_from_external_module_1_but_cannot_be_named: DiagnosticMessage;
+        Return_type_of_public_static_method_from_exported_class_has_or_is_using_name_0_from_private_module_1: DiagnosticMessage;
+        Return_type_of_public_static_method_from_exported_class_has_or_is_using_private_name_0: DiagnosticMessage;
+        Return_type_of_public_method_from_exported_class_has_or_is_using_name_0_from_external_module_1_but_cannot_be_named: DiagnosticMessage;
+        Return_type_of_public_method_from_exported_class_has_or_is_using_name_0_from_private_module_1: DiagnosticMessage;
+        Return_type_of_public_method_from_exported_class_has_or_is_using_private_name_0: DiagnosticMessage;
+        Return_type_of_method_from_exported_interface_has_or_is_using_name_0_from_private_module_1: DiagnosticMessage;
+        Return_type_of_method_from_exported_interface_has_or_is_using_private_name_0: DiagnosticMessage;
+        Return_type_of_exported_function_has_or_is_using_name_0_from_external_module_1_but_cannot_be_named: DiagnosticMessage;
+        Return_type_of_exported_function_has_or_is_using_name_0_from_private_module_1: DiagnosticMessage;
+        Return_type_of_exported_function_has_or_is_using_private_name_0: DiagnosticMessage;
+        Parameter_0_of_constructor_from_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: DiagnosticMessage;
+        Parameter_0_of_constructor_from_exported_class_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Parameter_0_of_constructor_from_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
+        Parameter_0_of_constructor_signature_from_exported_interface_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Parameter_0_of_constructor_signature_from_exported_interface_has_or_is_using_private_name_1: DiagnosticMessage;
+        Parameter_0_of_call_signature_from_exported_interface_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Parameter_0_of_call_signature_from_exported_interface_has_or_is_using_private_name_1: DiagnosticMessage;
+        Parameter_0_of_public_static_method_from_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: DiagnosticMessage;
+        Parameter_0_of_public_static_method_from_exported_class_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Parameter_0_of_public_static_method_from_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
+        Parameter_0_of_public_method_from_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: DiagnosticMessage;
+        Parameter_0_of_public_method_from_exported_class_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Parameter_0_of_public_method_from_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
+        Parameter_0_of_method_from_exported_interface_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Parameter_0_of_method_from_exported_interface_has_or_is_using_private_name_1: DiagnosticMessage;
+        Parameter_0_of_exported_function_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: DiagnosticMessage;
+        Parameter_0_of_exported_function_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Parameter_0_of_exported_function_has_or_is_using_private_name_1: DiagnosticMessage;
+        Exported_type_alias_0_has_or_is_using_private_name_1: DiagnosticMessage;
+        Default_export_of_the_module_has_or_is_using_private_name_0: DiagnosticMessage;
+        Type_parameter_0_of_exported_type_alias_has_or_is_using_private_name_1: DiagnosticMessage;
+        Conflicting_definitions_for_0_found_at_1_and_2_Consider_installing_a_specific_version_of_this_library_to_resolve_the_conflict: DiagnosticMessage;
+        Parameter_0_of_index_signature_from_exported_interface_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Parameter_0_of_index_signature_from_exported_interface_has_or_is_using_private_name_1: DiagnosticMessage;
+        Property_0_of_exported_class_expression_may_not_be_private_or_protected: DiagnosticMessage;
+        Public_static_method_0_of_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: DiagnosticMessage;
+        Public_static_method_0_of_exported_class_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Public_static_method_0_of_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
+        Public_method_0_of_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: DiagnosticMessage;
+        Public_method_0_of_exported_class_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Public_method_0_of_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
+        Method_0_of_exported_interface_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Method_0_of_exported_interface_has_or_is_using_private_name_1: DiagnosticMessage;
+        The_current_host_does_not_support_the_0_option: DiagnosticMessage;
+        Cannot_find_the_common_subdirectory_path_for_the_input_files: DiagnosticMessage;
+        File_specification_cannot_end_in_a_recursive_directory_wildcard_Asterisk_Asterisk_Colon_0: DiagnosticMessage;
+        Cannot_read_file_0_Colon_1: DiagnosticMessage;
+        Failed_to_parse_file_0_Colon_1: DiagnosticMessage;
+        Unknown_compiler_option_0: DiagnosticMessage;
+        Compiler_option_0_requires_a_value_of_type_1: DiagnosticMessage;
+        Could_not_write_file_0_Colon_1: DiagnosticMessage;
+        Option_project_cannot_be_mixed_with_source_files_on_a_command_line: DiagnosticMessage;
+        Option_isolatedModules_can_only_be_used_when_either_option_module_is_provided_or_option_target_is_ES2015_or_higher: DiagnosticMessage;
+        Option_0_can_only_be_used_when_either_option_inlineSourceMap_or_option_sourceMap_is_provided: DiagnosticMessage;
+        Option_0_cannot_be_specified_without_specifying_option_1: DiagnosticMessage;
+        Option_0_cannot_be_specified_with_option_1: DiagnosticMessage;
+        A_tsconfig_json_file_is_already_defined_at_Colon_0: DiagnosticMessage;
+        Cannot_write_file_0_because_it_would_overwrite_input_file: DiagnosticMessage;
+        Cannot_write_file_0_because_it_would_be_overwritten_by_multiple_input_files: DiagnosticMessage;
+        Cannot_find_a_tsconfig_json_file_at_the_specified_directory_Colon_0: DiagnosticMessage;
+        The_specified_path_does_not_exist_Colon_0: DiagnosticMessage;
+        Invalid_value_for_reactNamespace_0_is_not_a_valid_identifier: DiagnosticMessage;
+        Option_paths_cannot_be_used_without_specifying_baseUrl_option: DiagnosticMessage;
+        Pattern_0_can_have_at_most_one_Asterisk_character: DiagnosticMessage;
+        Substitution_0_in_pattern_1_in_can_have_at_most_one_Asterisk_character: DiagnosticMessage;
+        Substitutions_for_pattern_0_should_be_an_array: DiagnosticMessage;
+        Substitution_0_for_pattern_1_has_incorrect_type_expected_string_got_2: DiagnosticMessage;
+        File_specification_cannot_contain_a_parent_directory_that_appears_after_a_recursive_directory_wildcard_Asterisk_Asterisk_Colon_0: DiagnosticMessage;
+        Substitutions_for_pattern_0_shouldn_t_be_an_empty_array: DiagnosticMessage;
+        Invalid_value_for_jsxFactory_0_is_not_a_valid_identifier_or_qualified_name: DiagnosticMessage;
+        Adding_a_tsconfig_json_file_will_help_organize_projects_that_contain_both_TypeScript_and_JavaScript_files_Learn_more_at_https_Colon_Slash_Slashaka_ms_Slashtsconfig: DiagnosticMessage;
+        Option_0_cannot_be_specified_without_specifying_option_1_or_option_2: DiagnosticMessage;
+        Option_resolveJsonModule_cannot_be_specified_without_node_module_resolution_strategy: DiagnosticMessage;
+        Generates_a_sourcemap_for_each_corresponding_d_ts_file: DiagnosticMessage;
+        Concatenate_and_emit_output_to_single_file: DiagnosticMessage;
+        Generates_corresponding_d_ts_file: DiagnosticMessage;
+        Specify_the_location_where_debugger_should_locate_map_files_instead_of_generated_locations: DiagnosticMessage;
+        Specify_the_location_where_debugger_should_locate_TypeScript_files_instead_of_source_locations: DiagnosticMessage;
+        Watch_input_files: DiagnosticMessage;
+        Redirect_output_structure_to_the_directory: DiagnosticMessage;
+        Do_not_erase_const_enum_declarations_in_generated_code: DiagnosticMessage;
+        Do_not_emit_outputs_if_any_errors_were_reported: DiagnosticMessage;
+        Do_not_emit_comments_to_output: DiagnosticMessage;
+        Do_not_emit_outputs: DiagnosticMessage;
+        Allow_default_imports_from_modules_with_no_default_export_This_does_not_affect_code_emit_just_typechecking: DiagnosticMessage;
+        Skip_type_checking_of_declaration_files: DiagnosticMessage;
+        Do_not_resolve_the_real_path_of_symlinks: DiagnosticMessage;
+        Only_emit_d_ts_declaration_files: DiagnosticMessage;
+        Specify_ECMAScript_target_version_Colon_ES3_default_ES5_ES2015_ES2016_ES2017_ES2018_or_ESNEXT: DiagnosticMessage;
+        Specify_module_code_generation_Colon_none_commonjs_amd_system_umd_es2015_or_ESNext: DiagnosticMessage;
+        Print_this_message: DiagnosticMessage;
+        Print_the_compiler_s_version: DiagnosticMessage;
+        Compile_the_project_given_the_path_to_its_configuration_file_or_to_a_folder_with_a_tsconfig_json: DiagnosticMessage;
+        Syntax_Colon_0: DiagnosticMessage;
+        options: DiagnosticMessage;
+        file: DiagnosticMessage;
+        Examples_Colon_0: DiagnosticMessage;
+        Options_Colon: DiagnosticMessage;
+        Version_0: DiagnosticMessage;
+        Insert_command_line_options_and_files_from_a_file: DiagnosticMessage;
+        Starting_compilation_in_watch_mode: DiagnosticMessage;
+        File_change_detected_Starting_incremental_compilation: DiagnosticMessage;
+        KIND: DiagnosticMessage;
+        FILE: DiagnosticMessage;
+        VERSION: DiagnosticMessage;
+        LOCATION: DiagnosticMessage;
+        DIRECTORY: DiagnosticMessage;
+        STRATEGY: DiagnosticMessage;
+        FILE_OR_DIRECTORY: DiagnosticMessage;
+        Generates_corresponding_map_file: DiagnosticMessage;
+        Compiler_option_0_expects_an_argument: DiagnosticMessage;
+        Unterminated_quoted_string_in_response_file_0: DiagnosticMessage;
+        Argument_for_0_option_must_be_Colon_1: DiagnosticMessage;
+        Locale_must_be_of_the_form_language_or_language_territory_For_example_0_or_1: DiagnosticMessage;
+        Unsupported_locale_0: DiagnosticMessage;
+        Unable_to_open_file_0: DiagnosticMessage;
+        Corrupted_locale_file_0: DiagnosticMessage;
+        Raise_error_on_expressions_and_declarations_with_an_implied_any_type: DiagnosticMessage;
+        File_0_not_found: DiagnosticMessage;
+        File_0_has_unsupported_extension_The_only_supported_extensions_are_1: DiagnosticMessage;
+        Suppress_noImplicitAny_errors_for_indexing_objects_lacking_index_signatures: DiagnosticMessage;
+        Do_not_emit_declarations_for_code_that_has_an_internal_annotation: DiagnosticMessage;
+        Specify_the_root_directory_of_input_files_Use_to_control_the_output_directory_structure_with_outDir: DiagnosticMessage;
+        File_0_is_not_under_rootDir_1_rootDir_is_expected_to_contain_all_source_files: DiagnosticMessage;
+        Specify_the_end_of_line_sequence_to_be_used_when_emitting_files_Colon_CRLF_dos_or_LF_unix: DiagnosticMessage;
+        NEWLINE: DiagnosticMessage;
+        Option_0_can_only_be_specified_in_tsconfig_json_file: DiagnosticMessage;
+        Enables_experimental_support_for_ES7_decorators: DiagnosticMessage;
+        Enables_experimental_support_for_emitting_type_metadata_for_decorators: DiagnosticMessage;
+        Enables_experimental_support_for_ES7_async_functions: DiagnosticMessage;
+        Specify_module_resolution_strategy_Colon_node_Node_js_or_classic_TypeScript_pre_1_6: DiagnosticMessage;
+        Initializes_a_TypeScript_project_and_creates_a_tsconfig_json_file: DiagnosticMessage;
+        Successfully_created_a_tsconfig_json_file: DiagnosticMessage;
+        Suppress_excess_property_checks_for_object_literals: DiagnosticMessage;
+        Stylize_errors_and_messages_using_color_and_context_experimental: DiagnosticMessage;
+        Do_not_report_errors_on_unused_labels: DiagnosticMessage;
+        Report_error_when_not_all_code_paths_in_function_return_a_value: DiagnosticMessage;
+        Report_errors_for_fallthrough_cases_in_switch_statement: DiagnosticMessage;
+        Do_not_report_errors_on_unreachable_code: DiagnosticMessage;
+        Disallow_inconsistently_cased_references_to_the_same_file: DiagnosticMessage;
+        Specify_library_files_to_be_included_in_the_compilation: DiagnosticMessage;
+        Specify_JSX_code_generation_Colon_preserve_react_native_or_react: DiagnosticMessage;
+        File_0_has_an_unsupported_extension_so_skipping_it: DiagnosticMessage;
+        Only_amd_and_system_modules_are_supported_alongside_0: DiagnosticMessage;
+        Base_directory_to_resolve_non_absolute_module_names: DiagnosticMessage;
+        Deprecated_Use_jsxFactory_instead_Specify_the_object_invoked_for_createElement_when_targeting_react_JSX_emit: DiagnosticMessage;
+        Enable_tracing_of_the_name_resolution_process: DiagnosticMessage;
+        Resolving_module_0_from_1: DiagnosticMessage;
+        Explicitly_specified_module_resolution_kind_Colon_0: DiagnosticMessage;
+        Module_resolution_kind_is_not_specified_using_0: DiagnosticMessage;
+        Module_name_0_was_successfully_resolved_to_1: DiagnosticMessage;
+        Module_name_0_was_not_resolved: DiagnosticMessage;
+        paths_option_is_specified_looking_for_a_pattern_to_match_module_name_0: DiagnosticMessage;
+        Module_name_0_matched_pattern_1: DiagnosticMessage;
+        Trying_substitution_0_candidate_module_location_Colon_1: DiagnosticMessage;
+        Resolving_module_name_0_relative_to_base_url_1_2: DiagnosticMessage;
+        Loading_module_as_file_Slash_folder_candidate_module_location_0_target_file_type_1: DiagnosticMessage;
+        File_0_does_not_exist: DiagnosticMessage;
+        File_0_exist_use_it_as_a_name_resolution_result: DiagnosticMessage;
+        Loading_module_0_from_node_modules_folder_target_file_type_1: DiagnosticMessage;
+        Found_package_json_at_0: DiagnosticMessage;
+        package_json_does_not_have_a_0_field: DiagnosticMessage;
+        package_json_has_0_field_1_that_references_2: DiagnosticMessage;
+        Allow_javascript_files_to_be_compiled: DiagnosticMessage;
+        Option_0_should_have_array_of_strings_as_a_value: DiagnosticMessage;
+        Checking_if_0_is_the_longest_matching_prefix_for_1_2: DiagnosticMessage;
+        Expected_type_of_0_field_in_package_json_to_be_string_got_1: DiagnosticMessage;
+        baseUrl_option_is_set_to_0_using_this_value_to_resolve_non_relative_module_name_1: DiagnosticMessage;
+        rootDirs_option_is_set_using_it_to_resolve_relative_module_name_0: DiagnosticMessage;
+        Longest_matching_prefix_for_0_is_1: DiagnosticMessage;
+        Loading_0_from_the_root_dir_1_candidate_location_2: DiagnosticMessage;
+        Trying_other_entries_in_rootDirs: DiagnosticMessage;
+        Module_resolution_using_rootDirs_has_failed: DiagnosticMessage;
+        Do_not_emit_use_strict_directives_in_module_output: DiagnosticMessage;
+        Enable_strict_null_checks: DiagnosticMessage;
+        Unknown_option_excludes_Did_you_mean_exclude: DiagnosticMessage;
+        Raise_error_on_this_expressions_with_an_implied_any_type: DiagnosticMessage;
+        Resolving_type_reference_directive_0_containing_file_1_root_directory_2: DiagnosticMessage;
+        Resolving_using_primary_search_paths: DiagnosticMessage;
+        Resolving_from_node_modules_folder: DiagnosticMessage;
+        Type_reference_directive_0_was_successfully_resolved_to_1_primary_Colon_2: DiagnosticMessage;
+        Type_reference_directive_0_was_not_resolved: DiagnosticMessage;
+        Resolving_with_primary_search_path_0: DiagnosticMessage;
+        Root_directory_cannot_be_determined_skipping_primary_search_paths: DiagnosticMessage;
+        Resolving_type_reference_directive_0_containing_file_1_root_directory_not_set: DiagnosticMessage;
+        Type_declaration_files_to_be_included_in_compilation: DiagnosticMessage;
+        Looking_up_in_node_modules_folder_initial_location_0: DiagnosticMessage;
+        Containing_file_is_not_specified_and_root_directory_cannot_be_determined_skipping_lookup_in_node_modules_folder: DiagnosticMessage;
+        Resolving_type_reference_directive_0_containing_file_not_set_root_directory_1: DiagnosticMessage;
+        Resolving_type_reference_directive_0_containing_file_not_set_root_directory_not_set: DiagnosticMessage;
+        Resolving_real_path_for_0_result_1: DiagnosticMessage;
+        Cannot_compile_modules_using_option_0_unless_the_module_flag_is_amd_or_system: DiagnosticMessage;
+        File_name_0_has_a_1_extension_stripping_it: DiagnosticMessage;
+        _0_is_declared_but_its_value_is_never_read: DiagnosticMessage;
+        Report_errors_on_unused_locals: DiagnosticMessage;
+        Report_errors_on_unused_parameters: DiagnosticMessage;
+        The_maximum_dependency_depth_to_search_under_node_modules_and_load_JavaScript_files: DiagnosticMessage;
+        Cannot_import_type_declaration_files_Consider_importing_0_instead_of_1: DiagnosticMessage;
+        Property_0_is_declared_but_its_value_is_never_read: DiagnosticMessage;
+        Import_emit_helpers_from_tslib: DiagnosticMessage;
+        Auto_discovery_for_typings_is_enabled_in_project_0_Running_extra_resolution_pass_for_module_1_using_cache_location_2: DiagnosticMessage;
+        Parse_in_strict_mode_and_emit_use_strict_for_each_source_file: DiagnosticMessage;
+        Module_0_was_resolved_to_1_but_jsx_is_not_set: DiagnosticMessage;
+        Module_0_was_resolved_as_locally_declared_ambient_module_in_file_1: DiagnosticMessage;
+        Module_0_was_resolved_as_ambient_module_declared_in_1_since_this_file_was_not_modified: DiagnosticMessage;
+        Specify_the_JSX_factory_function_to_use_when_targeting_react_JSX_emit_e_g_React_createElement_or_h: DiagnosticMessage;
+        Resolution_for_module_0_was_found_in_cache_from_location_1: DiagnosticMessage;
+        Directory_0_does_not_exist_skipping_all_lookups_in_it: DiagnosticMessage;
+        Show_diagnostic_information: DiagnosticMessage;
+        Show_verbose_diagnostic_information: DiagnosticMessage;
+        Emit_a_single_file_with_source_maps_instead_of_having_a_separate_file: DiagnosticMessage;
+        Emit_the_source_alongside_the_sourcemaps_within_a_single_file_requires_inlineSourceMap_or_sourceMap_to_be_set: DiagnosticMessage;
+        Transpile_each_file_as_a_separate_module_similar_to_ts_transpileModule: DiagnosticMessage;
+        Print_names_of_generated_files_part_of_the_compilation: DiagnosticMessage;
+        Print_names_of_files_part_of_the_compilation: DiagnosticMessage;
+        The_locale_used_when_displaying_messages_to_the_user_e_g_en_us: DiagnosticMessage;
+        Do_not_generate_custom_helper_functions_like_extends_in_compiled_output: DiagnosticMessage;
+        Do_not_include_the_default_library_file_lib_d_ts: DiagnosticMessage;
+        Do_not_add_triple_slash_references_or_imported_modules_to_the_list_of_compiled_files: DiagnosticMessage;
+        Deprecated_Use_skipLibCheck_instead_Skip_type_checking_of_default_library_declaration_files: DiagnosticMessage;
+        List_of_folders_to_include_type_definitions_from: DiagnosticMessage;
+        Disable_size_limitations_on_JavaScript_projects: DiagnosticMessage;
+        The_character_set_of_the_input_files: DiagnosticMessage;
+        Emit_a_UTF_8_Byte_Order_Mark_BOM_in_the_beginning_of_output_files: DiagnosticMessage;
+        Do_not_truncate_error_messages: DiagnosticMessage;
+        Output_directory_for_generated_declaration_files: DiagnosticMessage;
+        A_series_of_entries_which_re_map_imports_to_lookup_locations_relative_to_the_baseUrl: DiagnosticMessage;
+        List_of_root_folders_whose_combined_content_represents_the_structure_of_the_project_at_runtime: DiagnosticMessage;
+        Show_all_compiler_options: DiagnosticMessage;
+        Deprecated_Use_outFile_instead_Concatenate_and_emit_output_to_single_file: DiagnosticMessage;
+        Command_line_Options: DiagnosticMessage;
+        Basic_Options: DiagnosticMessage;
+        Strict_Type_Checking_Options: DiagnosticMessage;
+        Module_Resolution_Options: DiagnosticMessage;
+        Source_Map_Options: DiagnosticMessage;
+        Additional_Checks: DiagnosticMessage;
+        Experimental_Options: DiagnosticMessage;
+        Advanced_Options: DiagnosticMessage;
+        Provide_full_support_for_iterables_in_for_of_spread_and_destructuring_when_targeting_ES5_or_ES3: DiagnosticMessage;
+        Enable_all_strict_type_checking_options: DiagnosticMessage;
+        List_of_language_service_plugins: DiagnosticMessage;
+        Scoped_package_detected_looking_in_0: DiagnosticMessage;
+        Reusing_resolution_of_module_0_to_file_1_from_old_program: DiagnosticMessage;
+        Reusing_module_resolutions_originating_in_0_since_resolutions_are_unchanged_from_old_program: DiagnosticMessage;
+        Disable_strict_checking_of_generic_signatures_in_function_types: DiagnosticMessage;
+        Enable_strict_checking_of_function_types: DiagnosticMessage;
+        Enable_strict_checking_of_property_initialization_in_classes: DiagnosticMessage;
+        Numeric_separators_are_not_allowed_here: DiagnosticMessage;
+        Multiple_consecutive_numeric_separators_are_not_permitted: DiagnosticMessage;
+        Found_package_json_at_0_Package_ID_is_1: DiagnosticMessage;
+        Whether_to_keep_outdated_console_output_in_watch_mode_instead_of_clearing_the_screen: DiagnosticMessage;
+        All_imports_in_import_declaration_are_unused: DiagnosticMessage;
+        Found_1_error_Watching_for_file_changes: DiagnosticMessage;
+        Found_0_errors_Watching_for_file_changes: DiagnosticMessage;
+        Resolve_keyof_to_string_valued_property_names_only_no_numbers_or_symbols: DiagnosticMessage;
+        _0_is_declared_but_never_used: DiagnosticMessage;
+        Include_modules_imported_with_json_extension: DiagnosticMessage;
+        All_destructured_elements_are_unused: DiagnosticMessage;
+        All_variables_are_unused: DiagnosticMessage;
+        Projects_to_reference: DiagnosticMessage;
+        Enable_project_compilation: DiagnosticMessage;
+        Project_references_may_not_form_a_circular_graph_Cycle_detected_Colon_0: DiagnosticMessage;
+        Composite_projects_may_not_disable_declaration_emit: DiagnosticMessage;
+        Output_file_0_has_not_been_built_from_source_file_1: DiagnosticMessage;
+        Referenced_project_0_must_have_setting_composite_Colon_true: DiagnosticMessage;
+        File_0_is_not_in_project_file_list_Projects_must_list_all_files_or_use_an_include_pattern: DiagnosticMessage;
+        Cannot_prepend_project_0_because_it_does_not_have_outFile_set: DiagnosticMessage;
+        Output_file_0_from_project_1_does_not_exist: DiagnosticMessage;
+        Project_0_is_out_of_date_because_oldest_output_1_is_older_than_newest_input_2: DiagnosticMessage;
+        Project_0_is_up_to_date_because_newest_input_1_is_older_than_oldest_output_2: DiagnosticMessage;
+        Project_0_is_out_of_date_because_output_file_1_does_not_exist: DiagnosticMessage;
+        Project_0_is_out_of_date_because_its_dependency_1_is_out_of_date: DiagnosticMessage;
+        Project_0_is_up_to_date_with_d_ts_files_from_its_dependencies: DiagnosticMessage;
+        Projects_in_this_build_Colon_0: DiagnosticMessage;
+        A_non_dry_build_would_delete_the_following_files_Colon_0: DiagnosticMessage;
+        A_non_dry_build_would_build_project_0: DiagnosticMessage;
+        Building_project_0: DiagnosticMessage;
+        Updating_output_timestamps_of_project_0: DiagnosticMessage;
+        delete_this_Project_0_is_up_to_date_because_it_was_previously_built: DiagnosticMessage;
+        Project_0_is_up_to_date: DiagnosticMessage;
+        Skipping_build_of_project_0_because_its_dependency_1_has_errors: DiagnosticMessage;
+        Project_0_can_t_be_built_because_its_dependency_1_has_errors: DiagnosticMessage;
+        Build_one_or_more_projects_and_their_dependencies_if_out_of_date: DiagnosticMessage;
+        Delete_the_outputs_of_all_projects: DiagnosticMessage;
+        Enable_verbose_logging: DiagnosticMessage;
+        Show_what_would_be_built_or_deleted_if_specified_with_clean: DiagnosticMessage;
+        Build_all_projects_including_those_that_appear_to_be_up_to_date: DiagnosticMessage;
+        Option_build_must_be_the_first_command_line_argument: DiagnosticMessage;
+        Options_0_and_1_cannot_be_combined: DiagnosticMessage;
+        Skipping_clean_because_not_all_projects_could_be_located: DiagnosticMessage;
+        Variable_0_implicitly_has_an_1_type: DiagnosticMessage;
+        Parameter_0_implicitly_has_an_1_type: DiagnosticMessage;
+        Member_0_implicitly_has_an_1_type: DiagnosticMessage;
+        new_expression_whose_target_lacks_a_construct_signature_implicitly_has_an_any_type: DiagnosticMessage;
+        _0_which_lacks_return_type_annotation_implicitly_has_an_1_return_type: DiagnosticMessage;
+        Function_expression_which_lacks_return_type_annotation_implicitly_has_an_0_return_type: DiagnosticMessage;
+        Construct_signature_which_lacks_return_type_annotation_implicitly_has_an_any_return_type: DiagnosticMessage;
+        Element_implicitly_has_an_any_type_because_index_expression_is_not_of_type_number: DiagnosticMessage;
+        Could_not_find_a_declaration_file_for_module_0_1_implicitly_has_an_any_type: DiagnosticMessage;
+        Element_implicitly_has_an_any_type_because_type_0_has_no_index_signature: DiagnosticMessage;
+        Object_literal_s_property_0_implicitly_has_an_1_type: DiagnosticMessage;
+        Rest_parameter_0_implicitly_has_an_any_type: DiagnosticMessage;
+        Call_signature_which_lacks_return_type_annotation_implicitly_has_an_any_return_type: DiagnosticMessage;
+        _0_implicitly_has_type_any_because_it_does_not_have_a_type_annotation_and_is_referenced_directly_or_indirectly_in_its_own_initializer: DiagnosticMessage;
+        _0_implicitly_has_return_type_any_because_it_does_not_have_a_return_type_annotation_and_is_referenced_directly_or_indirectly_in_one_of_its_return_expressions: DiagnosticMessage;
+        Function_implicitly_has_return_type_any_because_it_does_not_have_a_return_type_annotation_and_is_referenced_directly_or_indirectly_in_one_of_its_return_expressions: DiagnosticMessage;
+        Generator_implicitly_has_type_0_because_it_does_not_yield_any_values_Consider_supplying_a_return_type: DiagnosticMessage;
+        JSX_element_implicitly_has_type_any_because_no_interface_JSX_0_exists: DiagnosticMessage;
+        Unreachable_code_detected: DiagnosticMessage;
+        Unused_label: DiagnosticMessage;
+        Fallthrough_case_in_switch: DiagnosticMessage;
+        Not_all_code_paths_return_a_value: DiagnosticMessage;
+        Binding_element_0_implicitly_has_an_1_type: DiagnosticMessage;
+        Property_0_implicitly_has_type_any_because_its_set_accessor_lacks_a_parameter_type_annotation: DiagnosticMessage;
+        Property_0_implicitly_has_type_any_because_its_get_accessor_lacks_a_return_type_annotation: DiagnosticMessage;
+        Variable_0_implicitly_has_type_1_in_some_locations_where_its_type_cannot_be_determined: DiagnosticMessage;
+        Try_npm_install_types_Slash_0_if_it_exists_or_add_a_new_declaration_d_ts_file_containing_declare_module_0: DiagnosticMessage;
+        Dynamic_import_s_specifier_must_be_of_type_string_but_here_has_type_0: DiagnosticMessage;
+        Enables_emit_interoperability_between_CommonJS_and_ES_Modules_via_creation_of_namespace_objects_for_all_imports_Implies_allowSyntheticDefaultImports: DiagnosticMessage;
+        A_namespace_style_import_cannot_be_called_or_constructed_and_will_cause_a_failure_at_runtime: DiagnosticMessage;
+        Mapped_object_type_implicitly_has_an_any_template_type: DiagnosticMessage;
+        You_cannot_rename_this_element: DiagnosticMessage;
+        You_cannot_rename_elements_that_are_defined_in_the_standard_TypeScript_library: DiagnosticMessage;
+        import_can_only_be_used_in_a_ts_file: DiagnosticMessage;
+        export_can_only_be_used_in_a_ts_file: DiagnosticMessage;
+        type_parameter_declarations_can_only_be_used_in_a_ts_file: DiagnosticMessage;
+        implements_clauses_can_only_be_used_in_a_ts_file: DiagnosticMessage;
+        interface_declarations_can_only_be_used_in_a_ts_file: DiagnosticMessage;
+        module_declarations_can_only_be_used_in_a_ts_file: DiagnosticMessage;
+        type_aliases_can_only_be_used_in_a_ts_file: DiagnosticMessage;
+        _0_can_only_be_used_in_a_ts_file: DiagnosticMessage;
+        types_can_only_be_used_in_a_ts_file: DiagnosticMessage;
+        type_arguments_can_only_be_used_in_a_ts_file: DiagnosticMessage;
+        parameter_modifiers_can_only_be_used_in_a_ts_file: DiagnosticMessage;
+        non_null_assertions_can_only_be_used_in_a_ts_file: DiagnosticMessage;
+        enum_declarations_can_only_be_used_in_a_ts_file: DiagnosticMessage;
+        type_assertion_expressions_can_only_be_used_in_a_ts_file: DiagnosticMessage;
+        Octal_literal_types_must_use_ES2015_syntax_Use_the_syntax_0: DiagnosticMessage;
+        Octal_literals_are_not_allowed_in_enums_members_initializer_Use_the_syntax_0: DiagnosticMessage;
+        Report_errors_in_js_files: DiagnosticMessage;
+        JSDoc_types_can_only_be_used_inside_documentation_comments: DiagnosticMessage;
+        JSDoc_typedef_tag_should_either_have_a_type_annotation_or_be_followed_by_property_or_member_tags: DiagnosticMessage;
+        JSDoc_0_is_not_attached_to_a_class: DiagnosticMessage;
+        JSDoc_0_1_does_not_match_the_extends_2_clause: DiagnosticMessage;
+        JSDoc_param_tag_has_name_0_but_there_is_no_parameter_with_that_name: DiagnosticMessage;
+        Class_declarations_cannot_have_more_than_one_augments_or_extends_tag: DiagnosticMessage;
+        Expected_0_type_arguments_provide_these_with_an_extends_tag: DiagnosticMessage;
+        Expected_0_1_type_arguments_provide_these_with_an_extends_tag: DiagnosticMessage;
+        JSDoc_may_only_appear_in_the_last_parameter_of_a_signature: DiagnosticMessage;
+        JSDoc_param_tag_has_name_0_but_there_is_no_parameter_with_that_name_It_would_match_arguments_if_it_had_an_array_type: DiagnosticMessage;
+        Only_identifiers_Slashqualified_names_with_optional_type_arguments_are_currently_supported_in_a_class_extends_clause: DiagnosticMessage;
+        class_expressions_are_not_currently_supported: DiagnosticMessage;
+        Language_service_is_disabled: DiagnosticMessage;
+        JSX_attributes_must_only_be_assigned_a_non_empty_expression: DiagnosticMessage;
+        JSX_elements_cannot_have_multiple_attributes_with_the_same_name: DiagnosticMessage;
+        Expected_corresponding_JSX_closing_tag_for_0: DiagnosticMessage;
+        JSX_attribute_expected: DiagnosticMessage;
+        Cannot_use_JSX_unless_the_jsx_flag_is_provided: DiagnosticMessage;
+        A_constructor_cannot_contain_a_super_call_when_its_class_extends_null: DiagnosticMessage;
+        An_unary_expression_with_the_0_operator_is_not_allowed_in_the_left_hand_side_of_an_exponentiation_expression_Consider_enclosing_the_expression_in_parentheses: DiagnosticMessage;
+        A_type_assertion_expression_is_not_allowed_in_the_left_hand_side_of_an_exponentiation_expression_Consider_enclosing_the_expression_in_parentheses: DiagnosticMessage;
+        JSX_element_0_has_no_corresponding_closing_tag: DiagnosticMessage;
+        super_must_be_called_before_accessing_this_in_the_constructor_of_a_derived_class: DiagnosticMessage;
+        Unknown_type_acquisition_option_0: DiagnosticMessage;
+        super_must_be_called_before_accessing_a_property_of_super_in_the_constructor_of_a_derived_class: DiagnosticMessage;
+        _0_is_not_a_valid_meta_property_for_keyword_1_Did_you_mean_2: DiagnosticMessage;
+        Meta_property_0_is_only_allowed_in_the_body_of_a_function_declaration_function_expression_or_constructor: DiagnosticMessage;
+        JSX_fragment_has_no_corresponding_closing_tag: DiagnosticMessage;
+        Expected_corresponding_closing_tag_for_JSX_fragment: DiagnosticMessage;
+        JSX_fragment_is_not_supported_when_using_jsxFactory: DiagnosticMessage;
+        JSX_fragment_is_not_supported_when_using_an_inline_JSX_factory_pragma: DiagnosticMessage;
+        Circularity_detected_while_resolving_configuration_Colon_0: DiagnosticMessage;
+        A_path_in_an_extends_option_must_be_relative_or_rooted_but_0_is_not: DiagnosticMessage;
+        The_files_list_in_config_file_0_is_empty: DiagnosticMessage;
+        No_inputs_were_found_in_config_file_0_Specified_include_paths_were_1_and_exclude_paths_were_2: DiagnosticMessage;
+        File_is_a_CommonJS_module_it_may_be_converted_to_an_ES6_module: DiagnosticMessage;
+        This_constructor_function_may_be_converted_to_a_class_declaration: DiagnosticMessage;
+        Import_may_be_converted_to_a_default_import: DiagnosticMessage;
+        JSDoc_types_may_be_moved_to_TypeScript_types: DiagnosticMessage;
+        require_call_may_be_converted_to_an_import: DiagnosticMessage;
+        Add_missing_super_call: DiagnosticMessage;
+        Make_super_call_the_first_statement_in_the_constructor: DiagnosticMessage;
+        Change_extends_to_implements: DiagnosticMessage;
+        Remove_declaration_for_Colon_0: DiagnosticMessage;
+        Remove_import_from_0: DiagnosticMessage;
+        Implement_interface_0: DiagnosticMessage;
+        Implement_inherited_abstract_class: DiagnosticMessage;
+        Add_0_to_unresolved_variable: DiagnosticMessage;
+        Remove_destructuring: DiagnosticMessage;
+        Remove_variable_statement: DiagnosticMessage;
+        Import_0_from_module_1: DiagnosticMessage;
+        Change_0_to_1: DiagnosticMessage;
+        Add_0_to_existing_import_declaration_from_1: DiagnosticMessage;
+        Declare_property_0: DiagnosticMessage;
+        Add_index_signature_for_property_0: DiagnosticMessage;
+        Disable_checking_for_this_file: DiagnosticMessage;
+        Ignore_this_error_message: DiagnosticMessage;
+        Initialize_property_0_in_the_constructor: DiagnosticMessage;
+        Initialize_static_property_0: DiagnosticMessage;
+        Change_spelling_to_0: DiagnosticMessage;
+        Declare_method_0: DiagnosticMessage;
+        Declare_static_method_0: DiagnosticMessage;
+        Prefix_0_with_an_underscore: DiagnosticMessage;
+        Rewrite_as_the_indexed_access_type_0: DiagnosticMessage;
+        Declare_static_property_0: DiagnosticMessage;
+        Call_decorator_expression: DiagnosticMessage;
+        Add_async_modifier_to_containing_function: DiagnosticMessage;
+        Convert_function_to_an_ES2015_class: DiagnosticMessage;
+        Convert_function_0_to_class: DiagnosticMessage;
+        Extract_to_0_in_1: DiagnosticMessage;
+        Extract_function: DiagnosticMessage;
+        Extract_constant: DiagnosticMessage;
+        Extract_to_0_in_enclosing_scope: DiagnosticMessage;
+        Extract_to_0_in_1_scope: DiagnosticMessage;
+        Annotate_with_type_from_JSDoc: DiagnosticMessage;
+        Annotate_with_types_from_JSDoc: DiagnosticMessage;
+        Infer_type_of_0_from_usage: DiagnosticMessage;
+        Infer_parameter_types_from_usage: DiagnosticMessage;
+        Convert_to_default_import: DiagnosticMessage;
+        Install_0: DiagnosticMessage;
+        Replace_import_with_0: DiagnosticMessage;
+        Use_synthetic_default_member: DiagnosticMessage;
+        Convert_to_ES6_module: DiagnosticMessage;
+        Add_undefined_type_to_property_0: DiagnosticMessage;
+        Add_initializer_to_property_0: DiagnosticMessage;
+        Add_definite_assignment_assertion_to_property_0: DiagnosticMessage;
+        Add_all_missing_members: DiagnosticMessage;
+        Infer_all_types_from_usage: DiagnosticMessage;
+        Delete_all_unused_declarations: DiagnosticMessage;
+        Prefix_all_unused_declarations_with_where_possible: DiagnosticMessage;
+        Fix_all_detected_spelling_errors: DiagnosticMessage;
+        Add_initializers_to_all_uninitialized_properties: DiagnosticMessage;
+        Add_definite_assignment_assertions_to_all_uninitialized_properties: DiagnosticMessage;
+        Add_undefined_type_to_all_uninitialized_properties: DiagnosticMessage;
+        Change_all_jsdoc_style_types_to_TypeScript: DiagnosticMessage;
+        Change_all_jsdoc_style_types_to_TypeScript_and_add_undefined_to_nullable_types: DiagnosticMessage;
+        Implement_all_unimplemented_interfaces: DiagnosticMessage;
+        Install_all_missing_types_packages: DiagnosticMessage;
+        Rewrite_all_as_indexed_access_types: DiagnosticMessage;
+        Convert_all_to_default_imports: DiagnosticMessage;
+        Make_all_super_calls_the_first_statement_in_their_constructor: DiagnosticMessage;
+        Add_qualifier_to_all_unresolved_variables_matching_a_member_name: DiagnosticMessage;
+        Change_all_extended_interfaces_to_implements: DiagnosticMessage;
+        Add_all_missing_super_calls: DiagnosticMessage;
+        Implement_all_inherited_abstract_classes: DiagnosticMessage;
+        Add_all_missing_async_modifiers: DiagnosticMessage;
+        Add_ts_ignore_to_all_error_messages: DiagnosticMessage;
+        Annotate_everything_with_types_from_JSDoc: DiagnosticMessage;
+        Add_to_all_uncalled_decorators: DiagnosticMessage;
+        Convert_all_constructor_functions_to_classes: DiagnosticMessage;
+        Generate_get_and_set_accessors: DiagnosticMessage;
+        Convert_require_to_import: DiagnosticMessage;
+        Convert_all_require_to_import: DiagnosticMessage;
+        Move_to_a_new_file: DiagnosticMessage;
+        Remove_unreachable_code: DiagnosticMessage;
+        Remove_all_unreachable_code: DiagnosticMessage;
+        Add_missing_typeof: DiagnosticMessage;
+        Remove_unused_label: DiagnosticMessage;
+        Remove_all_unused_labels: DiagnosticMessage;
+        Convert_0_to_mapped_object_type: DiagnosticMessage;
+        Convert_namespace_import_to_named_imports: DiagnosticMessage;
+        Convert_named_imports_to_namespace_import: DiagnosticMessage;
+    };
+}
+declare namespace ts {
+    type ErrorCallback = (message: DiagnosticMessage, length: number) => void;
+    function tokenIsIdentifierOrKeyword(token: SyntaxKind): boolean;
+    function tokenIsIdentifierOrKeywordOrGreaterThan(token: SyntaxKind): boolean;
+    interface Scanner {
+        getStartPos(): number;
+        getToken(): SyntaxKind;
+        getTextPos(): number;
+        getTokenPos(): number;
+        getTokenText(): string;
+        getTokenValue(): string;
+        hasExtendedUnicodeEscape(): boolean;
+        hasPrecedingLineBreak(): boolean;
+        isIdentifier(): boolean;
+        isReservedWord(): boolean;
+        isUnterminated(): boolean;
+        getTokenFlags(): TokenFlags;
+        reScanGreaterToken(): SyntaxKind;
+        reScanSlashToken(): SyntaxKind;
+        reScanTemplateToken(): SyntaxKind;
+        scanJsxIdentifier(): SyntaxKind;
+        scanJsxAttributeValue(): SyntaxKind;
+        reScanJsxToken(): JsxTokenSyntaxKind;
+        scanJsxToken(): JsxTokenSyntaxKind;
+        scanJSDocToken(): JsDocSyntaxKind;
+        scan(): SyntaxKind;
+        getText(): string;
+        setText(text: string | undefined, start?: number, length?: number): void;
+        setOnError(onError: ErrorCallback | undefined): void;
+        setScriptTarget(scriptTarget: ScriptTarget): void;
+        setLanguageVariant(variant: LanguageVariant): void;
+        setTextPos(textPos: number): void;
+        lookAhead<T>(callback: () => T): T;
+        scanRange<T>(start: number, length: number, callback: () => T): T;
+        tryScan<T>(callback: () => T): T;
+    }
+    function isUnicodeIdentifierStart(code: number, languageVersion: ScriptTarget | undefined): boolean;
+    function tokenToString(t: SyntaxKind): string | undefined;
+    function stringToToken(s: string): SyntaxKind | undefined;
+    function computeLineStarts(text: string): number[];
+    function getPositionOfLineAndCharacter(sourceFile: SourceFileLike, line: number, character: number): number;
+    function computePositionOfLineAndCharacter(lineStarts: ReadonlyArray<number>, line: number, character: number, debugText?: string): number;
+    function getLineStarts(sourceFile: SourceFileLike): ReadonlyArray<number>;
+    /**
+     * We assume the first line starts at position 0 and 'position' is non-negative.
+     */
+    function computeLineAndCharacterOfPosition(lineStarts: ReadonlyArray<number>, position: number): LineAndCharacter;
+    function getLineAndCharacterOfPosition(sourceFile: SourceFileLike, position: number): LineAndCharacter;
+    function isWhiteSpaceLike(ch: number): boolean;
+    /** Does not include line breaks. For that, see isWhiteSpaceLike. */
+    function isWhiteSpaceSingleLine(ch: number): boolean;
+    function isLineBreak(ch: number): boolean;
+    function isOctalDigit(ch: number): boolean;
+    function couldStartTrivia(text: string, pos: number): boolean;
+    function skipTrivia(text: string, pos: number, stopAfterLineBreak?: boolean, stopAtComments?: boolean): number;
+    function forEachLeadingCommentRange<U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean) => U): U | undefined;
+    function forEachLeadingCommentRange<T, U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean, state: T) => U, state: T): U | undefined;
+    function forEachTrailingCommentRange<U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean) => U): U | undefined;
+    function forEachTrailingCommentRange<T, U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean, state: T) => U, state: T): U | undefined;
+    function reduceEachLeadingCommentRange<T, U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean, state: T, memo: U) => U, state: T, initial: U): U | undefined;
+    function reduceEachTrailingCommentRange<T, U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean, state: T, memo: U) => U, state: T, initial: U): U | undefined;
+    function getLeadingCommentRanges(text: string, pos: number): CommentRange[] | undefined;
+    function getTrailingCommentRanges(text: string, pos: number): CommentRange[] | undefined;
+    /** Optionally, get the shebang */
+    function getShebang(text: string): string | undefined;
+    function isIdentifierStart(ch: number, languageVersion: ScriptTarget | undefined): boolean;
+    function isIdentifierPart(ch: number, languageVersion: ScriptTarget | undefined): boolean;
+    function isIdentifierText(name: string, languageVersion: ScriptTarget | undefined): boolean;
+    function createScanner(languageVersion: ScriptTarget, skipTrivia: boolean, languageVariant?: LanguageVariant, textInitial?: string, onError?: ErrorCallback, start?: number, length?: number): Scanner;
+}
+/** Non-internal stuff goes here */
+declare namespace ts {
+    const emptyArray: never[];
+    function closeFileWatcher(watcher: FileWatcher): void;
+    function isExternalModuleNameRelative(moduleName: string): boolean;
+    function sortAndDeduplicateDiagnostics<T extends Diagnostic>(diagnostics: ReadonlyArray<T>): T[];
+    function toPath(fileName: string, basePath: string | undefined, getCanonicalFileName: (path: string) => string): Path;
+    function hasEntries(map: ReadonlyUnderscoreEscapedMap<any> | undefined): map is ReadonlyUnderscoreEscapedMap<any>;
+}
+declare namespace ts {
+    const resolvingEmptyArray: never[];
+    const emptyMap: ReadonlyMap<never>;
+    const emptyUnderscoreEscapedMap: ReadonlyUnderscoreEscapedMap<never>;
+    const externalHelpersModuleNameText = "tslib";
+    function getDeclarationOfKind<T extends Declaration>(symbol: Symbol, kind: T["kind"]): T | undefined;
+    /** Create a new escaped identifier map. */
+    function createUnderscoreEscapedMap<T>(): UnderscoreEscapedMap<T>;
+    function createSymbolTable(symbols?: ReadonlyArray<Symbol>): SymbolTable;
+    function changesAffectModuleResolution(oldOptions: CompilerOptions, newOptions: CompilerOptions): boolean;
+    /**
+     * Iterates through the parent chain of a node and performs the callback on each parent until the callback
+     * returns a truthy value, then returns that value.
+     * If no such value is found, it applies the callback until the parent pointer is undefined or the callback returns "quit"
+     * At that point findAncestor returns undefined.
+     */
+    function findAncestor<T extends Node>(node: Node | undefined, callback: (element: Node) => element is T): T | undefined;
+    function findAncestor(node: Node | undefined, callback: (element: Node) => boolean | "quit"): Node | undefined;
+    /**
+     * Calls `callback` for each entry in the map, returning the first truthy result.
+     * Use `map.forEach` instead for normal iteration.
+     */
+    function forEachEntry<T, U>(map: ReadonlyUnderscoreEscapedMap<T>, callback: (value: T, key: __String) => U | undefined): U | undefined;
+    function forEachEntry<T, U>(map: ReadonlyMap<T>, callback: (value: T, key: string) => U | undefined): U | undefined;
+    /** `forEachEntry` for just keys. */
+    function forEachKey<T>(map: ReadonlyUnderscoreEscapedMap<{}>, callback: (key: __String) => T | undefined): T | undefined;
+    function forEachKey<T>(map: ReadonlyMap<{}>, callback: (key: string) => T | undefined): T | undefined;
+    /** Copy entries from `source` to `target`. */
+    function copyEntries<T>(source: ReadonlyUnderscoreEscapedMap<T>, target: UnderscoreEscapedMap<T>): void;
+    function copyEntries<T>(source: ReadonlyMap<T>, target: Map<T>): void;
+    /**
+     * Creates a set from the elements of an array.
+     *
+     * @param array the array of input elements.
+     */
+    function arrayToSet(array: ReadonlyArray<string>): Map<true>;
+    function arrayToSet<T>(array: ReadonlyArray<T>, makeKey: (value: T) => string | undefined): Map<true>;
+    function arrayToSet<T>(array: ReadonlyArray<T>, makeKey: (value: T) => __String | undefined): UnderscoreEscapedMap<true>;
+    function cloneMap(map: SymbolTable): SymbolTable;
+    function cloneMap<T>(map: ReadonlyMap<T>): Map<T>;
+    function cloneMap<T>(map: ReadonlyUnderscoreEscapedMap<T>): UnderscoreEscapedMap<T>;
+    function usingSingleLineStringWriter(action: (writer: EmitTextWriter) => void): string;
+    function getFullWidth(node: Node): number;
+    function getResolvedModule(sourceFile: SourceFile, moduleNameText: string): ResolvedModuleFull | undefined;
+    function setResolvedModule(sourceFile: SourceFile, moduleNameText: string, resolvedModule: ResolvedModuleFull): void;
+    function setResolvedTypeReferenceDirective(sourceFile: SourceFile, typeReferenceDirectiveName: string, resolvedTypeReferenceDirective: ResolvedTypeReferenceDirective): void;
+    function moduleResolutionIsEqualTo(oldResolution: ResolvedModuleFull, newResolution: ResolvedModuleFull): boolean;
+    function packageIdToString({ name, subModuleName, version }: PackageId): string;
+    function typeDirectiveIsEqualTo(oldResolution: ResolvedTypeReferenceDirective, newResolution: ResolvedTypeReferenceDirective): boolean;
+    function hasChangesInResolutions<T>(names: ReadonlyArray<string>, newResolutions: ReadonlyArray<T>, oldResolutions: ReadonlyMap<T> | undefined, comparer: (oldResolution: T, newResolution: T) => boolean): boolean;
+    function containsParseError(node: Node): boolean;
+    function getSourceFileOfNode(node: Node): SourceFile;
+    function getSourceFileOfNode(node: Node | undefined): SourceFile | undefined;
+    function isStatementWithLocals(node: Node): boolean;
+    function getStartPositionOfLine(line: number, sourceFile: SourceFileLike): number;
+    function nodePosToString(node: Node): string;
+    function getEndLinePosition(line: number, sourceFile: SourceFileLike): number;
+    /**
+     * Returns a value indicating whether a name is unique globally or within the current file.
+     * Note: This does not consider whether a name appears as a free identifier or not, so at the expression `x.y` this includes both `x` and `y`.
+     */
+    function isFileLevelUniqueName(sourceFile: SourceFile, name: string, hasGlobalName?: PrintHandlers["hasGlobalName"]): boolean;
+    function nodeIsMissing(node: Node | undefined): boolean;
+    function nodeIsPresent(node: Node | undefined): boolean;
+    /**
+     * Appends a range of value to begin of an array, returning the array.
+     *
+     * @param to The array to which `value` is to be appended. If `to` is `undefined`, a new array
+     * is created if `value` was appended.
+     * @param from The values to append to the array. If `from` is `undefined`, nothing is
+     * appended. If an element of `from` is `undefined`, that element is not appended.
+     */
+    function prependStatements<T extends Statement>(to: T[], from: ReadonlyArray<T> | undefined): T[] | undefined;
+    /**
+     * Determine if the given comment is a triple-slash
+     *
+     * @return true if the comment is a triple-slash comment else false
+     */
+    function isRecognizedTripleSlashComment(text: string, commentPos: number, commentEnd: number): boolean;
+    function isPinnedComment(text: string, start: number): boolean;
+    function getTokenPosOfNode(node: Node, sourceFile?: SourceFileLike, includeJsDoc?: boolean): number;
+    function getNonDecoratorTokenPosOfNode(node: Node, sourceFile?: SourceFileLike): number;
+    function getSourceTextOfNodeFromSourceFile(sourceFile: SourceFile, node: Node, includeTrivia?: boolean): string;
+    function getTextOfNodeFromSourceText(sourceText: string, node: Node, includeTrivia?: boolean): string;
+    function getTextOfNode(node: Node, includeTrivia?: boolean): string;
+    /**
+     * Note: it is expected that the `nodeArray` and the `node` are within the same file.
+     * For example, searching for a `SourceFile` in a `SourceFile[]` wouldn't work.
+     */
+    function indexOfNode(nodeArray: ReadonlyArray<Node>, node: Node): number;
+    /**
+     * Gets flags that control emit behavior of a node.
+     */
+    function getEmitFlags(node: Node): EmitFlags;
+    function getLiteralText(node: LiteralLikeNode, sourceFile: SourceFile): string;
+    function getTextOfConstantValue(value: string | number): string;
+    function escapeLeadingUnderscores(identifier: string): __String;
+    /**
+     * @deprecated Use `id.escapedText` to get the escaped text of an Identifier.
+     * @param identifier The identifier to escape
+     */
+    function escapeIdentifier(identifier: string): string;
+    function makeIdentifierFromModuleName(moduleName: string): string;
+    function isBlockOrCatchScoped(declaration: Declaration): boolean;
+    function isCatchClauseVariableDeclarationOrBindingElement(declaration: Declaration): boolean;
+    function isAmbientModule(node: Node): node is AmbientModuleDeclaration;
+    function isModuleWithStringLiteralName(node: Node): node is ModuleDeclaration;
+    function isNonGlobalAmbientModule(node: Node): node is ModuleDeclaration & {
+        name: StringLiteral;
+    };
+    /**
+     * An effective module (namespace) declaration is either
+     * 1. An actual declaration: namespace X { ... }
+     * 2. A Javascript declaration, which is:
+     *    An identifier in a nested property access expression: Y in `X.Y.Z = { ... }`
+     */
+    function isEffectiveModuleDeclaration(node: Node): boolean;
+    /** Given a symbol for a module, checks that it is a shorthand ambient module. */
+    function isShorthandAmbientModuleSymbol(moduleSymbol: Symbol): boolean;
+    function isBlockScopedContainerTopLevel(node: Node): boolean;
+    function isGlobalScopeAugmentation(module: ModuleDeclaration): boolean;
+    function isExternalModuleAugmentation(node: Node): node is AmbientModuleDeclaration;
+    function isModuleAugmentationExternal(node: AmbientModuleDeclaration): boolean;
+    function isEffectiveExternalModule(node: SourceFile, compilerOptions: CompilerOptions): boolean;
+    function isBlockScope(node: Node, parentNode: Node): boolean;
+    function isDeclarationWithTypeParameters(node: Node): node is DeclarationWithTypeParameters;
+    function isAnyImportSyntax(node: Node): node is AnyImportSyntax;
+    function isLateVisibilityPaintedStatement(node: Node): node is LateVisibilityPaintedStatement;
+    function isAnyImportOrReExport(node: Node): node is AnyImportOrReExport;
+    function getEnclosingBlockScopeContainer(node: Node): Node;
+    function declarationNameToString(name: DeclarationName | QualifiedName): string;
+    function getNameFromIndexInfo(info: IndexInfo): string | undefined;
+    function getTextOfPropertyName(name: PropertyName): __String;
+    function entityNameToString(name: EntityNameOrEntityNameExpression): string;
+    function createDiagnosticForNode(node: Node, message: DiagnosticMessage, arg0?: string | number, arg1?: string | number, arg2?: string | number, arg3?: string | number): DiagnosticWithLocation;
+    function createDiagnosticForNodeArray(sourceFile: SourceFile, nodes: NodeArray<Node>, message: DiagnosticMessage, arg0?: string | number, arg1?: string | number, arg2?: string | number, arg3?: string | number): Diagnostic;
+    function createDiagnosticForNodeInSourceFile(sourceFile: SourceFile, node: Node, message: DiagnosticMessage, arg0?: string | number, arg1?: string | number, arg2?: string | number, arg3?: string | number): DiagnosticWithLocation;
+    function createDiagnosticForNodeFromMessageChain(node: Node, messageChain: DiagnosticMessageChain): DiagnosticWithLocation;
+    function getSpanOfTokenAtPosition(sourceFile: SourceFile, pos: number): TextSpan;
+    function getErrorSpanForNode(sourceFile: SourceFile, node: Node): TextSpan;
+    function isExternalOrCommonJsModule(file: SourceFile): boolean;
+    function isJsonSourceFile(file: SourceFile): file is JsonSourceFile;
+    function isConstEnumDeclaration(node: Node): boolean;
+    function isConst(node: Node): boolean;
+    function isLet(node: Node): boolean;
+    function isSuperCall(n: Node): n is SuperCall;
+    function isImportCall(n: Node): n is ImportCall;
+    function isLiteralImportTypeNode(n: Node): n is LiteralImportTypeNode;
+    function isPrologueDirective(node: Node): node is PrologueDirective;
+    function getLeadingCommentRangesOfNode(node: Node, sourceFileOfNode: SourceFile): CommentRange[] | undefined;
+    function getJSDocCommentRanges(node: Node, text: string): CommentRange[] | undefined;
+    const fullTripleSlashReferencePathRegEx: RegExp;
+    const fullTripleSlashAMDReferencePathRegEx: RegExp;
+    function isPartOfTypeNode(node: Node): boolean;
+    function isChildOfNodeWithKind(node: Node, kind: SyntaxKind): boolean;
+    function forEachReturnStatement<T>(body: Block, visitor: (stmt: ReturnStatement) => T): T | undefined;
+    function forEachYieldExpression(body: Block, visitor: (expr: YieldExpression) => void): void;
+    /**
+     * Gets the most likely element type for a TypeNode. This is not an exhaustive test
+     * as it assumes a rest argument can only be an array type (either T[], or Array<T>).
+     *
+     * @param node The type node.
+     */
+    function getRestParameterElementType(node: TypeNode | undefined): TypeNode | undefined;
+    function getMembersOfDeclaration(node: Declaration): NodeArray<ClassElement | TypeElement | ObjectLiteralElement> | undefined;
+    function isVariableLike(node: Node): node is VariableLikeDeclaration;
+    function isVariableLikeOrAccessor(node: Node): node is AccessorDeclaration | VariableLikeDeclaration;
+    function isVariableDeclarationInVariableStatement(node: VariableDeclaration): boolean;
+    function isValidESSymbolDeclaration(node: Node): node is VariableDeclaration | PropertyDeclaration | SignatureDeclaration;
+    function introducesArgumentsExoticObject(node: Node): boolean;
+    function unwrapInnermostStatementOfLabel(node: LabeledStatement, beforeUnwrapLabelCallback?: (node: LabeledStatement) => void): Statement;
+    function isFunctionBlock(node: Node): boolean;
+    function isObjectLiteralMethod(node: Node): node is MethodDeclaration;
+    function isObjectLiteralOrClassExpressionMethod(node: Node): node is MethodDeclaration;
+    function isIdentifierTypePredicate(predicate: TypePredicate): predicate is IdentifierTypePredicate;
+    function isThisTypePredicate(predicate: TypePredicate): predicate is ThisTypePredicate;
+    function getPropertyAssignment(objectLiteral: ObjectLiteralExpression, key: string, key2?: string): ReadonlyArray<PropertyAssignment>;
+    function getTsConfigObjectLiteralExpression(tsConfigSourceFile: TsConfigSourceFile | undefined): ObjectLiteralExpression | undefined;
+    function getTsConfigPropArrayElementValue(tsConfigSourceFile: TsConfigSourceFile | undefined, propKey: string, elementValue: string): StringLiteral | undefined;
+    function getTsConfigPropArray(tsConfigSourceFile: TsConfigSourceFile | undefined, propKey: string): ReadonlyArray<PropertyAssignment>;
+    function getContainingFunction(node: Node): SignatureDeclaration | undefined;
+    function getContainingClass(node: Node): ClassLikeDeclaration | undefined;
+    function getThisContainer(node: Node, includeArrowFunctions: boolean): Node;
+    function getNewTargetContainer(node: Node): Node | undefined;
+    /**
+     * Given an super call/property node, returns the closest node where
+     * - a super call/property access is legal in the node and not legal in the parent node the node.
+     *   i.e. super call is legal in constructor but not legal in the class body.
+     * - the container is an arrow function (so caller might need to call getSuperContainer again in case it needs to climb higher)
+     * - a super call/property is definitely illegal in the container (but might be legal in some subnode)
+     *   i.e. super property access is illegal in function declaration but can be legal in the statement list
+     */
+    function getSuperContainer(node: Node, stopOnFunctions: boolean): Node;
+    function getImmediatelyInvokedFunctionExpression(func: Node): CallExpression | undefined;
+    /**
+     * Determines whether a node is a property or element access expression for `super`.
+     */
+    function isSuperProperty(node: Node): node is SuperProperty;
+    /**
+     * Determines whether a node is a property or element access expression for `this`.
+     */
+    function isThisProperty(node: Node): boolean;
+    function getEntityNameFromTypeNode(node: TypeNode): EntityNameOrEntityNameExpression | undefined;
+    function getInvokedExpression(node: CallLikeExpression): Expression;
+    function nodeCanBeDecorated(node: ClassDeclaration): true;
+    function nodeCanBeDecorated(node: ClassElement, parent: Node): boolean;
+    function nodeCanBeDecorated(node: Node, parent: Node, grandparent: Node): boolean;
+    function nodeIsDecorated(node: ClassDeclaration): boolean;
+    function nodeIsDecorated(node: ClassElement, parent: Node): boolean;
+    function nodeIsDecorated(node: Node, parent: Node, grandparent: Node): boolean;
+    function nodeOrChildIsDecorated(node: ClassDeclaration): boolean;
+    function nodeOrChildIsDecorated(node: ClassElement, parent: Node): boolean;
+    function nodeOrChildIsDecorated(node: Node, parent: Node, grandparent: Node): boolean;
+    function childIsDecorated(node: ClassDeclaration): boolean;
+    function childIsDecorated(node: Node, parent: Node): boolean;
+    function isJSXTagName(node: Node): boolean;
+    function isExpressionNode(node: Node): boolean;
+    function isInExpressionContext(node: Node): boolean;
+    function isExternalModuleImportEqualsDeclaration(node: Node): boolean;
+    function getExternalModuleImportEqualsDeclarationExpression(node: Node): Expression;
+    function isInternalModuleImportEqualsDeclaration(node: Node): node is ImportEqualsDeclaration;
+    function isSourceFileJavaScript(file: SourceFile): boolean;
+    function isSourceFileNotJavaScript(file: SourceFile): boolean;
+    function isInJavaScriptFile(node: Node | undefined): boolean;
+    function isInJsonFile(node: Node | undefined): boolean;
+    function isInJSDoc(node: Node | undefined): boolean;
+    function isJSDocIndexSignature(node: TypeReferenceNode | ExpressionWithTypeArguments): boolean | undefined;
+    /**
+     * Returns true if the node is a CallExpression to the identifier 'require' with
+     * exactly one argument (of the form 'require("name")').
+     * This function does not test if the node is in a JavaScript file or not.
+     */
+    function isRequireCall(callExpression: Node, checkArgumentIsStringLiteralLike: true): callExpression is RequireOrImportCall & {
+        expression: Identifier;
+        arguments: [StringLiteralLike];
+    };
+    function isRequireCall(callExpression: Node, checkArgumentIsStringLiteralLike: boolean): callExpression is CallExpression;
+    function isSingleOrDoubleQuote(charCode: number): boolean;
+    function isStringDoubleQuoted(str: StringLiteralLike, sourceFile: SourceFile): boolean;
+    function getDeclarationOfJSInitializer(node: Node): Node | undefined;
+    /** Get the initializer, taking into account defaulted Javascript initializers */
+    function getEffectiveInitializer(node: HasExpressionInitializer): Expression | undefined;
+    /**
+     * Get the assignment 'initializer' -- the righthand side-- when the initializer is container-like (See getJavascriptInitializer).
+     * We treat the right hand side of assignments with container-like initalizers as declarations.
+     */
+    function getAssignedJavascriptInitializer(node: Node): Expression | undefined;
+    /**
+     * Recognized Javascript container-like initializers are:
+     * 1. (function() {})() -- IIFEs
+     * 2. function() { } -- Function expressions
+     * 3. class { } -- Class expressions
+     * 4. {} -- Empty object literals
+     * 5. { ... } -- Non-empty object literals, when used to initialize a prototype, like `C.prototype = { m() { } }`
+     *
+     * This function returns the provided initializer, or undefined if it is not valid.
+     */
+    function getJavascriptInitializer(initializer: Node, isPrototypeAssignment: boolean): Expression | undefined;
+    function isDefaultedJavascriptInitializer(node: BinaryExpression): boolean | undefined;
+    /** Given a Javascript initializer, return the outer name. That is, the lhs of the assignment or the declaration name. */
+    function getOuterNameOfJsInitializer(node: Declaration): DeclarationName | undefined;
+    function getRightMostAssignedExpression(node: Expression): Expression;
+    function isExportsIdentifier(node: Node): boolean;
+    function isModuleExportsPropertyAccessExpression(node: Node): boolean;
+    function getSpecialPropertyAssignmentKind(expr: BinaryExpression): SpecialPropertyAssignmentKind;
+    function getInitializerOfBinaryExpression(expr: BinaryExpression): Expression;
+    function isPrototypePropertyAssignment(node: Node): boolean;
+    function isSpecialPropertyDeclaration(expr: PropertyAccessExpression): boolean;
+    function importFromModuleSpecifier(node: StringLiteralLike): AnyValidImportOrReExport;
+    function tryGetImportFromModuleSpecifier(node: StringLiteralLike): AnyValidImportOrReExport | undefined;
+    function getExternalModuleName(node: AnyImportOrReExport | ImportTypeNode): Expression | undefined;
+    function getNamespaceDeclarationNode(node: ImportDeclaration | ImportEqualsDeclaration | ExportDeclaration): ImportEqualsDeclaration | NamespaceImport | undefined;
+    function isDefaultImport(node: ImportDeclaration | ImportEqualsDeclaration | ExportDeclaration): boolean;
+    function hasQuestionToken(node: Node): boolean;
+    function isJSDocConstructSignature(node: Node): boolean;
+    function isJSDocTypeAlias(node: Node): node is JSDocTypedefTag | JSDocCallbackTag;
+    function isTypeAlias(node: Node): node is JSDocTypedefTag | JSDocCallbackTag | TypeAliasDeclaration;
+    function getJSDocCommentsAndTags(hostNode: Node): ReadonlyArray<JSDoc | JSDocTag>;
+    /** Does the opposite of `getJSDocParameterTags`: given a JSDoc parameter, finds the parameter corresponding to it. */
+    function getParameterSymbolFromJSDoc(node: JSDocParameterTag): Symbol | undefined;
+    function getHostSignatureFromJSDoc(node: Node): SignatureDeclaration | undefined;
+    function getHostSignatureFromJSDocHost(host: HasJSDoc): SignatureDeclaration | undefined;
+    function getJSDocHost(node: Node): HasJSDoc;
+    function getTypeParameterFromJsDoc(node: TypeParameterDeclaration & {
+        parent: JSDocTemplateTag;
+    }): TypeParameterDeclaration | undefined;
+    function hasRestParameter(s: SignatureDeclaration | JSDocSignature): boolean;
+    function isRestParameter(node: ParameterDeclaration | JSDocParameterTag): boolean;
+    enum AssignmentKind {
+        None = 0,
+        Definite = 1,
+        Compound = 2
+    }
+    function getAssignmentTargetKind(node: Node): AssignmentKind;
+    function isAssignmentTarget(node: Node): boolean;
+    type NodeWithPossibleHoistedDeclaration = Block | VariableStatement | WithStatement | IfStatement | SwitchStatement | CaseBlock | CaseClause | DefaultClause | LabeledStatement | ForStatement | ForInStatement | ForOfStatement | DoStatement | WhileStatement | TryStatement | CatchClause;
+    /**
+     * Indicates whether a node could contain a `var` VariableDeclarationList that contributes to
+     * the same `var` declaration scope as the node's parent.
+     */
+    function isNodeWithPossibleHoistedDeclaration(node: Node): node is NodeWithPossibleHoistedDeclaration;
+    type ValueSignatureDeclaration = FunctionDeclaration | MethodDeclaration | ConstructorDeclaration | AccessorDeclaration | FunctionExpression | ArrowFunction;
+    function isValueSignatureDeclaration(node: Node): node is ValueSignatureDeclaration;
+    function walkUpParenthesizedTypes(node: Node): Node;
+    function walkUpParenthesizedExpressions(node: Node): Node;
+    function skipParentheses(node: Expression): Expression;
+    function skipParentheses(node: Node): Node;
+    function isDeleteTarget(node: Node): boolean;
+    function isNodeDescendantOf(node: Node, ancestor: Node): boolean;
+    function isDeclarationName(name: Node): boolean;
+    function isAnyDeclarationName(name: Node): boolean;
+    function isLiteralComputedPropertyDeclarationName(node: Node): boolean;
+    function isIdentifierName(node: Identifier): boolean;
+    function isAliasSymbolDeclaration(node: Node): boolean;
+    function exportAssignmentIsAlias(node: ExportAssignment | BinaryExpression): boolean;
+    function getClassExtendsHeritageClauseElement(node: ClassLikeDeclaration | InterfaceDeclaration): ExpressionWithTypeArguments | undefined;
+    function getClassImplementsHeritageClauseElements(node: ClassLikeDeclaration): NodeArray<ExpressionWithTypeArguments> | undefined;
+    /** Returns the node in an `extends` or `implements` clause of a class or interface. */
+    function getAllSuperTypeNodes(node: Node): ReadonlyArray<TypeNode>;
+    function getInterfaceBaseTypeNodes(node: InterfaceDeclaration): NodeArray<ExpressionWithTypeArguments> | undefined;
+    function getHeritageClause(clauses: NodeArray<HeritageClause> | undefined, kind: SyntaxKind): HeritageClause | undefined;
+    function tryResolveScriptReference(host: ScriptReferenceHost, sourceFile: SourceFile, reference: FileReference): SourceFile | undefined;
+    function getAncestor(node: Node | undefined, kind: SyntaxKind): Node | undefined;
+    function isKeyword(token: SyntaxKind): boolean;
+    function isContextualKeyword(token: SyntaxKind): boolean;
+    function isNonContextualKeyword(token: SyntaxKind): boolean;
+    function isStringANonContextualKeyword(name: string): boolean;
+    type TriviaKind = SyntaxKind.SingleLineCommentTrivia | SyntaxKind.MultiLineCommentTrivia | SyntaxKind.NewLineTrivia | SyntaxKind.WhitespaceTrivia | SyntaxKind.ShebangTrivia | SyntaxKind.ConflictMarkerTrivia;
+    function isTrivia(token: SyntaxKind): token is TriviaKind;
+    enum FunctionFlags {
+        Normal = 0,
+        Generator = 1,
+        Async = 2,
+        Invalid = 4,
+        AsyncGenerator = 3
+    }
+    function getFunctionFlags(node: SignatureDeclaration | undefined): FunctionFlags;
+    function isAsyncFunction(node: Node): boolean;
+    function isStringOrNumericLiteral(node: Node): node is StringLiteral | NumericLiteral;
+    /**
+     * A declaration has a dynamic name if both of the following are true:
+     *   1. The declaration has a computed property name
+     *   2. The computed name is *not* expressed as Symbol.<name>, where name
+     *      is a property of the Symbol constructor that denotes a built in
+     *      Symbol.
+     */
+    function hasDynamicName(declaration: Declaration): declaration is DynamicNamedDeclaration;
+    function isDynamicName(name: DeclarationName): boolean;
+    /**
+     * Checks if the expression is of the form:
+     *    Symbol.name
+     * where Symbol is literally the word "Symbol", and name is any identifierName
+     */
+    function isWellKnownSymbolSyntactically(node: Expression): boolean;
+    function getPropertyNameForPropertyNameNode(name: DeclarationName): __String | undefined;
+    type PropertyNameLiteral = Identifier | StringLiteralLike | NumericLiteral;
+    function isPropertyNameLiteral(node: Node): node is PropertyNameLiteral;
+    function getTextOfIdentifierOrLiteral(node: PropertyNameLiteral): string;
+    function getEscapedTextOfIdentifierOrLiteral(node: PropertyNameLiteral): __String;
+    function getPropertyNameForKnownSymbolName(symbolName: string): __String;
+    function isKnownSymbol(symbol: Symbol): boolean;
+    /**
+     * Includes the word "Symbol" with unicode escapes
+     */
+    function isESSymbolIdentifier(node: Node): boolean;
+    function isPushOrUnshiftIdentifier(node: Identifier): boolean;
+    function isParameterDeclaration(node: VariableLikeDeclaration): boolean;
+    function getRootDeclaration(node: Node): Node;
+    function nodeStartsNewLexicalEnvironment(node: Node): boolean;
+    function nodeIsSynthesized(range: TextRange): boolean;
+    function getOriginalSourceFile(sourceFile: SourceFile): SourceFile;
+    enum Associativity {
+        Left = 0,
+        Right = 1
+    }
+    function getExpressionAssociativity(expression: Expression): Associativity;
+    function getOperatorAssociativity(kind: SyntaxKind, operator: SyntaxKind, hasArguments?: boolean): Associativity;
+    function getExpressionPrecedence(expression: Expression): number;
+    function getOperator(expression: Expression): SyntaxKind.Unknown | SyntaxKind.EndOfFileToken | SyntaxKind.SingleLineCommentTrivia | SyntaxKind.MultiLineCommentTrivia | SyntaxKind.NewLineTrivia | SyntaxKind.WhitespaceTrivia | SyntaxKind.ShebangTrivia | SyntaxKind.ConflictMarkerTrivia | SyntaxKind.NumericLiteral | SyntaxKind.StringLiteral | SyntaxKind.JsxText | SyntaxKind.JsxTextAllWhiteSpaces | SyntaxKind.RegularExpressionLiteral | SyntaxKind.NoSubstitutionTemplateLiteral | SyntaxKind.TemplateHead | SyntaxKind.TemplateMiddle | SyntaxKind.TemplateTail | SyntaxKind.OpenBraceToken | SyntaxKind.CloseBraceToken | SyntaxKind.OpenParenToken | SyntaxKind.CloseParenToken | SyntaxKind.OpenBracketToken | SyntaxKind.CloseBracketToken | SyntaxKind.DotToken | SyntaxKind.DotDotDotToken | SyntaxKind.SemicolonToken | SyntaxKind.CommaToken | SyntaxKind.LessThanToken | SyntaxKind.LessThanSlashToken | SyntaxKind.GreaterThanToken | SyntaxKind.LessThanEqualsToken | SyntaxKind.GreaterThanEqualsToken | SyntaxKind.EqualsEqualsToken | SyntaxKind.ExclamationEqualsToken | SyntaxKind.EqualsEqualsEqualsToken | SyntaxKind.ExclamationEqualsEqualsToken | SyntaxKind.EqualsGreaterThanToken | SyntaxKind.PlusToken | SyntaxKind.MinusToken | SyntaxKind.AsteriskToken | SyntaxKind.AsteriskAsteriskToken | SyntaxKind.SlashToken | SyntaxKind.PercentToken | SyntaxKind.PlusPlusToken | SyntaxKind.MinusMinusToken | SyntaxKind.LessThanLessThanToken | SyntaxKind.GreaterThanGreaterThanToken | SyntaxKind.GreaterThanGreaterThanGreaterThanToken | SyntaxKind.AmpersandToken | SyntaxKind.BarToken | SyntaxKind.CaretToken | SyntaxKind.ExclamationToken | SyntaxKind.TildeToken | SyntaxKind.AmpersandAmpersandToken | SyntaxKind.BarBarToken | SyntaxKind.QuestionToken | SyntaxKind.ColonToken | SyntaxKind.AtToken | SyntaxKind.EqualsToken | SyntaxKind.PlusEqualsToken | SyntaxKind.MinusEqualsToken | SyntaxKind.AsteriskEqualsToken | SyntaxKind.AsteriskAsteriskEqualsToken | SyntaxKind.SlashEqualsToken | SyntaxKind.PercentEqualsToken | SyntaxKind.LessThanLessThanEqualsToken | SyntaxKind.GreaterThanGreaterThanEqualsToken | SyntaxKind.GreaterThanGreaterThanGreaterThanEqualsToken | SyntaxKind.AmpersandEqualsToken | SyntaxKind.BarEqualsToken | SyntaxKind.CaretEqualsToken | SyntaxKind.Identifier | SyntaxKind.BreakKeyword | SyntaxKind.CaseKeyword | SyntaxKind.CatchKeyword | SyntaxKind.ClassKeyword | SyntaxKind.ConstKeyword | SyntaxKind.ContinueKeyword | SyntaxKind.DebuggerKeyword | SyntaxKind.DefaultKeyword | SyntaxKind.DeleteKeyword | SyntaxKind.DoKeyword | SyntaxKind.ElseKeyword | SyntaxKind.EnumKeyword | SyntaxKind.ExportKeyword | SyntaxKind.ExtendsKeyword | SyntaxKind.FalseKeyword | SyntaxKind.FinallyKeyword | SyntaxKind.ForKeyword | SyntaxKind.FunctionKeyword | SyntaxKind.IfKeyword | SyntaxKind.ImportKeyword | SyntaxKind.InKeyword | SyntaxKind.InstanceOfKeyword | SyntaxKind.NewKeyword | SyntaxKind.NullKeyword | SyntaxKind.ReturnKeyword | SyntaxKind.SuperKeyword | SyntaxKind.SwitchKeyword | SyntaxKind.ThisKeyword | SyntaxKind.ThrowKeyword | SyntaxKind.TrueKeyword | SyntaxKind.TryKeyword | SyntaxKind.TypeOfKeyword | SyntaxKind.VarKeyword | SyntaxKind.VoidKeyword | SyntaxKind.WhileKeyword | SyntaxKind.WithKeyword | SyntaxKind.ImplementsKeyword | SyntaxKind.InterfaceKeyword | SyntaxKind.LetKeyword | SyntaxKind.PackageKeyword | SyntaxKind.PrivateKeyword | SyntaxKind.ProtectedKeyword | SyntaxKind.PublicKeyword | SyntaxKind.StaticKeyword | SyntaxKind.YieldKeyword | SyntaxKind.AbstractKeyword | SyntaxKind.AsKeyword | SyntaxKind.AnyKeyword | SyntaxKind.AsyncKeyword | SyntaxKind.AwaitKeyword | SyntaxKind.BooleanKeyword | SyntaxKind.ConstructorKeyword | SyntaxKind.DeclareKeyword | SyntaxKind.GetKeyword | SyntaxKind.InferKeyword | SyntaxKind.IsKeyword | SyntaxKind.KeyOfKeyword | SyntaxKind.ModuleKeyword | SyntaxKind.NamespaceKeyword | SyntaxKind.NeverKeyword | SyntaxKind.ReadonlyKeyword | SyntaxKind.RequireKeyword | SyntaxKind.NumberKeyword | SyntaxKind.ObjectKeyword | SyntaxKind.SetKeyword | SyntaxKind.StringKeyword | SyntaxKind.SymbolKeyword | SyntaxKind.TypeKeyword | SyntaxKind.UndefinedKeyword | SyntaxKind.UniqueKeyword | SyntaxKind.UnknownKeyword | SyntaxKind.FromKeyword | SyntaxKind.GlobalKeyword | SyntaxKind.OfKeyword | SyntaxKind.QualifiedName | SyntaxKind.ComputedPropertyName | SyntaxKind.TypeParameter | SyntaxKind.Parameter | SyntaxKind.Decorator | SyntaxKind.PropertySignature | SyntaxKind.PropertyDeclaration | SyntaxKind.MethodSignature | SyntaxKind.MethodDeclaration | SyntaxKind.Constructor | SyntaxKind.GetAccessor | SyntaxKind.SetAccessor | SyntaxKind.CallSignature | SyntaxKind.ConstructSignature | SyntaxKind.IndexSignature | SyntaxKind.TypePredicate | SyntaxKind.TypeReference | SyntaxKind.FunctionType | SyntaxKind.ConstructorType | SyntaxKind.TypeQuery | SyntaxKind.TypeLiteral | SyntaxKind.ArrayType | SyntaxKind.TupleType | SyntaxKind.UnionType | SyntaxKind.IntersectionType | SyntaxKind.ConditionalType | SyntaxKind.InferType | SyntaxKind.ParenthesizedType | SyntaxKind.ThisType | SyntaxKind.TypeOperator | SyntaxKind.IndexedAccessType | SyntaxKind.MappedType | SyntaxKind.LiteralType | SyntaxKind.ImportType | SyntaxKind.ObjectBindingPattern | SyntaxKind.ArrayBindingPattern | SyntaxKind.BindingElement | SyntaxKind.ArrayLiteralExpression | SyntaxKind.ObjectLiteralExpression | SyntaxKind.PropertyAccessExpression | SyntaxKind.ElementAccessExpression | SyntaxKind.CallExpression | SyntaxKind.NewExpression | SyntaxKind.TaggedTemplateExpression | SyntaxKind.TypeAssertionExpression | SyntaxKind.ParenthesizedExpression | SyntaxKind.FunctionExpression | SyntaxKind.ArrowFunction | SyntaxKind.DeleteExpression | SyntaxKind.TypeOfExpression | SyntaxKind.VoidExpression | SyntaxKind.AwaitExpression | SyntaxKind.ConditionalExpression | SyntaxKind.TemplateExpression | SyntaxKind.YieldExpression | SyntaxKind.SpreadElement | SyntaxKind.ClassExpression | SyntaxKind.OmittedExpression | SyntaxKind.ExpressionWithTypeArguments | SyntaxKind.AsExpression | SyntaxKind.NonNullExpression | SyntaxKind.MetaProperty | SyntaxKind.TemplateSpan | SyntaxKind.SemicolonClassElement | SyntaxKind.Block | SyntaxKind.VariableStatement | SyntaxKind.EmptyStatement | SyntaxKind.ExpressionStatement | SyntaxKind.IfStatement | SyntaxKind.DoStatement | SyntaxKind.WhileStatement | SyntaxKind.ForStatement | SyntaxKind.ForInStatement | SyntaxKind.ForOfStatement | SyntaxKind.ContinueStatement | SyntaxKind.BreakStatement | SyntaxKind.ReturnStatement | SyntaxKind.WithStatement | SyntaxKind.SwitchStatement | SyntaxKind.LabeledStatement | SyntaxKind.ThrowStatement | SyntaxKind.TryStatement | SyntaxKind.DebuggerStatement | SyntaxKind.VariableDeclaration | SyntaxKind.VariableDeclarationList | SyntaxKind.FunctionDeclaration | SyntaxKind.ClassDeclaration | SyntaxKind.InterfaceDeclaration | SyntaxKind.TypeAliasDeclaration | SyntaxKind.EnumDeclaration | SyntaxKind.ModuleDeclaration | SyntaxKind.ModuleBlock | SyntaxKind.CaseBlock | SyntaxKind.NamespaceExportDeclaration | SyntaxKind.ImportEqualsDeclaration | SyntaxKind.ImportDeclaration | SyntaxKind.ImportClause | SyntaxKind.NamespaceImport | SyntaxKind.NamedImports | SyntaxKind.ImportSpecifier | SyntaxKind.ExportAssignment | SyntaxKind.ExportDeclaration | SyntaxKind.NamedExports | SyntaxKind.ExportSpecifier | SyntaxKind.MissingDeclaration | SyntaxKind.ExternalModuleReference | SyntaxKind.JsxElement | SyntaxKind.JsxSelfClosingElement | SyntaxKind.JsxOpeningElement | SyntaxKind.JsxClosingElement | SyntaxKind.JsxFragment | SyntaxKind.JsxOpeningFragment | SyntaxKind.JsxClosingFragment | SyntaxKind.JsxAttribute | SyntaxKind.JsxAttributes | SyntaxKind.JsxSpreadAttribute | SyntaxKind.JsxExpression | SyntaxKind.CaseClause | SyntaxKind.DefaultClause | SyntaxKind.HeritageClause | SyntaxKind.CatchClause | SyntaxKind.PropertyAssignment | SyntaxKind.ShorthandPropertyAssignment | SyntaxKind.SpreadAssignment | SyntaxKind.EnumMember | SyntaxKind.SourceFile | SyntaxKind.Bundle | SyntaxKind.UnparsedSource | SyntaxKind.InputFiles | SyntaxKind.JSDocTypeExpression | SyntaxKind.JSDocAllType | SyntaxKind.JSDocUnknownType | SyntaxKind.JSDocNullableType | SyntaxKind.JSDocNonNullableType | SyntaxKind.JSDocOptionalType | SyntaxKind.JSDocFunctionType | SyntaxKind.JSDocVariadicType | SyntaxKind.JSDocComment | SyntaxKind.JSDocTypeLiteral | SyntaxKind.JSDocSignature | SyntaxKind.JSDocTag | SyntaxKind.JSDocAugmentsTag | SyntaxKind.JSDocClassTag | SyntaxKind.JSDocCallbackTag | SyntaxKind.JSDocParameterTag | SyntaxKind.JSDocReturnTag | SyntaxKind.JSDocTypeTag | SyntaxKind.JSDocTemplateTag | SyntaxKind.JSDocTypedefTag | SyntaxKind.JSDocPropertyTag | SyntaxKind.SyntaxList | SyntaxKind.NotEmittedStatement | SyntaxKind.PartiallyEmittedExpression | SyntaxKind.CommaListExpression | SyntaxKind.MergeDeclarationMarker | SyntaxKind.EndOfDeclarationMarker | SyntaxKind.Count;
+    function getOperatorPrecedence(nodeKind: SyntaxKind, operatorKind: SyntaxKind, hasArguments?: boolean): number;
+    function getBinaryOperatorPrecedence(kind: SyntaxKind): number;
+    function createDiagnosticCollection(): DiagnosticCollection;
+    /**
+     * Based heavily on the abstract 'Quote'/'QuoteJSONString' operation from ECMA-262 (24.3.2.2),
+     * but augmented for a few select characters (e.g. lineSeparator, paragraphSeparator, nextLine)
+     * Note that this doesn't actually wrap the input in double quotes.
+     */
+    function escapeString(s: string, quoteChar?: CharacterCodes.doubleQuote | CharacterCodes.singleQuote | CharacterCodes.backtick): string;
+    function isIntrinsicJsxName(name: __String | string): boolean;
+    function escapeNonAsciiString(s: string, quoteChar?: CharacterCodes.doubleQuote | CharacterCodes.singleQuote | CharacterCodes.backtick): string;
+    function getIndentString(level: number): string;
+    function getIndentSize(): number;
+    function createTextWriter(newLine: string): EmitTextWriter;
+    function getResolvedExternalModuleName(host: EmitHost, file: SourceFile, referenceFile?: SourceFile): string;
+    function getExternalModuleNameFromDeclaration(host: EmitHost, resolver: EmitResolver, declaration: ImportEqualsDeclaration | ImportDeclaration | ExportDeclaration | ModuleDeclaration | ImportTypeNode): string | undefined;
+    /**
+     * Resolves a local path to a path which is absolute to the base of the emit
+     */
+    function getExternalModuleNameFromPath(host: EmitHost, fileName: string, referencePath?: string): string;
+    function getOwnEmitOutputFilePath(sourceFile: SourceFile, host: EmitHost, extension: string): string;
+    function getDeclarationEmitOutputFilePath(sourceFile: SourceFile, host: EmitHost): string;
+    interface EmitFileNames {
+        jsFilePath: string;
+        sourceMapFilePath: string | undefined;
+        declarationFilePath: string | undefined;
+        declarationMapPath: string | undefined;
+        bundleInfoPath: string | undefined;
+    }
+    /**
+     * Gets the source files that are expected to have an emit output.
+     *
+     * Originally part of `forEachExpectedEmitFile`, this functionality was extracted to support
+     * transformations.
+     *
+     * @param host An EmitHost.
+     * @param targetSourceFile An optional target source file to emit.
+     */
+    function getSourceFilesToEmit(host: EmitHost, targetSourceFile?: SourceFile): ReadonlyArray<SourceFile>;
+    /** Don't call this for `--outFile`, just for `--outDir` or plain emit. `--outFile` needs additional checks. */
+    function sourceFileMayBeEmitted(sourceFile: SourceFile, options: CompilerOptions, isSourceFileFromExternalLibrary: (file: SourceFile) => boolean): boolean;
+    function getSourceFilePathInNewDir(sourceFile: SourceFile, host: EmitHost, newDirPath: string): string;
+    function writeFile(host: EmitHost, diagnostics: DiagnosticCollection, fileName: string, data: string, writeByteOrderMark: boolean, sourceFiles?: ReadonlyArray<SourceFile>): void;
+    function getLineOfLocalPosition(currentSourceFile: SourceFile, pos: number): number;
+    function getLineOfLocalPositionFromLineMap(lineMap: ReadonlyArray<number>, pos: number): number;
+    function getFirstConstructorWithBody(node: ClassLikeDeclaration): ConstructorDeclaration | undefined;
+    /** Get the type annotation for the value parameter. */
+    function getSetAccessorTypeAnnotationNode(accessor: SetAccessorDeclaration): TypeNode | undefined;
+    function getThisParameter(signature: SignatureDeclaration | JSDocSignature): ParameterDeclaration | undefined;
+    function parameterIsThisKeyword(parameter: ParameterDeclaration): boolean;
+    function isThisIdentifier(node: Node | undefined): boolean;
+    function identifierIsThisKeyword(id: Identifier): boolean;
+    function getAllAccessorDeclarations(declarations: NodeArray<Declaration>, accessor: AccessorDeclaration): AllAccessorDeclarations;
+    /**
+     * Gets the effective type annotation of a variable, parameter, or property. If the node was
+     * parsed in a JavaScript file, gets the type annotation from JSDoc.
+     */
+    function getEffectiveTypeAnnotationNode(node: Node): TypeNode | undefined;
+    function getTypeAnnotationNode(node: Node): TypeNode | undefined;
+    /**
+     * Gets the effective return type annotation of a signature. If the node was parsed in a
+     * JavaScript file, gets the return type annotation from JSDoc.
+     */
+    function getEffectiveReturnTypeNode(node: SignatureDeclaration | JSDocSignature): TypeNode | undefined;
+    /**
+     * Gets the effective type parameters. If the node was parsed in a
+     * JavaScript file, gets the type parameters from the `@template` tag from JSDoc.
+     */
+    function getEffectiveTypeParameterDeclarations(node: DeclarationWithTypeParameters): ReadonlyArray<TypeParameterDeclaration>;
+    function getJSDocTypeParameterDeclarations(node: DeclarationWithTypeParameters): ReadonlyArray<TypeParameterDeclaration>;
+    /**
+     * Gets the effective type annotation of the value parameter of a set accessor. If the node
+     * was parsed in a JavaScript file, gets the type annotation from JSDoc.
+     */
+    function getEffectiveSetAccessorTypeAnnotationNode(node: SetAccessorDeclaration): TypeNode | undefined;
+    function emitNewLineBeforeLeadingComments(lineMap: ReadonlyArray<number>, writer: EmitTextWriter, node: TextRange, leadingComments: ReadonlyArray<CommentRange> | undefined): void;
+    function emitNewLineBeforeLeadingCommentsOfPosition(lineMap: ReadonlyArray<number>, writer: EmitTextWriter, pos: number, leadingComments: ReadonlyArray<CommentRange> | undefined): void;
+    function emitNewLineBeforeLeadingCommentOfPosition(lineMap: ReadonlyArray<number>, writer: EmitTextWriter, pos: number, commentPos: number): void;
+    function emitComments(text: string, lineMap: ReadonlyArray<number>, writer: EmitTextWriter, comments: ReadonlyArray<CommentRange> | undefined, leadingSeparator: boolean, trailingSeparator: boolean, newLine: string, writeComment: (text: string, lineMap: ReadonlyArray<number>, writer: EmitTextWriter, commentPos: number, commentEnd: number, newLine: string) => void): void;
+    /**
+     * Detached comment is a comment at the top of file or function body that is separated from
+     * the next statement by space.
+     */
+    function emitDetachedComments(text: string, lineMap: ReadonlyArray<number>, writer: EmitTextWriter, writeComment: (text: string, lineMap: ReadonlyArray<number>, writer: EmitTextWriter, commentPos: number, commentEnd: number, newLine: string) => void, node: TextRange, newLine: string, removeComments: boolean): {
+        nodePos: number;
+        detachedCommentEndPos: number;
+    } | undefined;
+    function writeCommentRange(text: string, lineMap: ReadonlyArray<number>, writer: EmitTextWriter, commentPos: number, commentEnd: number, newLine: string): void;
+    function hasModifiers(node: Node): boolean;
+    function hasModifier(node: Node, flags: ModifierFlags): boolean;
+    function hasStaticModifier(node: Node): boolean;
+    function hasReadonlyModifier(node: Node): boolean;
+    function getSelectedModifierFlags(node: Node, flags: ModifierFlags): ModifierFlags;
+    function getModifierFlags(node: Node): ModifierFlags;
+    function getModifierFlagsNoCache(node: Node): ModifierFlags;
+    function modifierToFlag(token: SyntaxKind): ModifierFlags;
+    function isLogicalOperator(token: SyntaxKind): boolean;
+    function isAssignmentOperator(token: SyntaxKind): boolean;
+    /** Get `C` given `N` if `N` is in the position `class C extends N` where `N` is an ExpressionWithTypeArguments. */
+    function tryGetClassExtendingExpressionWithTypeArguments(node: Node): ClassLikeDeclaration | undefined;
+    function isAssignmentExpression(node: Node, excludeCompoundAssignment: true): node is AssignmentExpression<EqualsToken>;
+    function isAssignmentExpression(node: Node, excludeCompoundAssignment?: false): node is AssignmentExpression<AssignmentOperatorToken>;
+    function isDestructuringAssignment(node: Node): node is DestructuringAssignment;
+    function isExpressionWithTypeArgumentsInClassExtendsClause(node: Node): boolean;
+    function isExpressionWithTypeArgumentsInClassImplementsClause(node: Node): node is ExpressionWithTypeArguments;
+    function isEntityNameExpression(node: Node): node is EntityNameExpression;
+    function isPropertyAccessEntityNameExpression(node: Node): node is PropertyAccessEntityNameExpression;
+    function isPrototypeAccess(node: Node): node is PropertyAccessExpression;
+    function isRightSideOfQualifiedNameOrPropertyAccess(node: Node): boolean;
+    function isEmptyObjectLiteral(expression: Node): boolean;
+    function isEmptyArrayLiteral(expression: Node): boolean;
+    function getLocalSymbolForExportDefault(symbol: Symbol): Symbol | undefined;
+    /** Return ".ts", ".d.ts", or ".tsx", if that is the extension. */
+    function tryExtractTypeScriptExtension(fileName: string): string | undefined;
+    /**
+     * Converts a string to a base-64 encoded ASCII string.
+     */
+    function convertToBase64(input: string): string;
+    function base64encode(host: {
+        base64encode?(input: string): string;
+    } | undefined, input: string): string;
+    function base64decode(host: {
+        base64decode?(input: string): string;
+    } | undefined, input: string): string;
+    function getNewLineCharacter(options: CompilerOptions | PrinterOptions, getNewLine?: () => string): string;
+    function formatSyntaxKind(kind: SyntaxKind | undefined): string;
+    function formatModifierFlags(flags: ModifierFlags | undefined): string;
+    function formatTransformFlags(flags: TransformFlags | undefined): string;
+    function formatEmitFlags(flags: EmitFlags | undefined): string;
+    function formatSymbolFlags(flags: SymbolFlags | undefined): string;
+    function formatTypeFlags(flags: TypeFlags | undefined): string;
+    function formatObjectFlags(flags: ObjectFlags | undefined): string;
+    /**
+     * Creates a new TextRange from the provided pos and end.
+     *
+     * @param pos The start position.
+     * @param end The end position.
+     */
+    function createRange(pos: number, end: number): TextRange;
+    /**
+     * Creates a new TextRange from a provided range with a new end position.
+     *
+     * @param range A TextRange.
+     * @param end The new end position.
+     */
+    function moveRangeEnd(range: TextRange, end: number): TextRange;
+    /**
+     * Creates a new TextRange from a provided range with a new start position.
+     *
+     * @param range A TextRange.
+     * @param pos The new Start position.
+     */
+    function moveRangePos(range: TextRange, pos: number): TextRange;
+    /**
+     * Moves the start position of a range past any decorators.
+     */
+    function moveRangePastDecorators(node: Node): TextRange;
+    /**
+     * Moves the start position of a range past any decorators or modifiers.
+     */
+    function moveRangePastModifiers(node: Node): TextRange;
+    /**
+     * Determines whether a TextRange has the same start and end positions.
+     *
+     * @param range A TextRange.
+     */
+    function isCollapsedRange(range: TextRange): boolean;
+    /**
+     * Creates a new TextRange for a token at the provides start position.
+     *
+     * @param pos The start position.
+     * @param token The token.
+     */
+    function createTokenRange(pos: number, token: SyntaxKind): TextRange;
+    function rangeIsOnSingleLine(range: TextRange, sourceFile: SourceFile): boolean;
+    function rangeStartPositionsAreOnSameLine(range1: TextRange, range2: TextRange, sourceFile: SourceFile): boolean;
+    function rangeEndPositionsAreOnSameLine(range1: TextRange, range2: TextRange, sourceFile: SourceFile): boolean;
+    function rangeStartIsOnSameLineAsRangeEnd(range1: TextRange, range2: TextRange, sourceFile: SourceFile): boolean;
+    function rangeEndIsOnSameLineAsRangeStart(range1: TextRange, range2: TextRange, sourceFile: SourceFile): boolean;
+    function positionsAreOnSameLine(pos1: number, pos2: number, sourceFile: SourceFile): boolean;
+    function getStartPositionOfRange(range: TextRange, sourceFile: SourceFile): number;
+    /**
+     * Determines whether a name was originally the declaration name of an enum or namespace
+     * declaration.
+     */
+    function isDeclarationNameOfEnumOrNamespace(node: Identifier): boolean;
+    function getInitializedVariables(node: VariableDeclarationList): ReadonlyArray<VariableDeclaration>;
+    function isWatchSet(options: CompilerOptions): boolean | undefined;
+    function getCheckFlags(symbol: Symbol): CheckFlags;
+    function getDeclarationModifierFlagsFromSymbol(s: Symbol): ModifierFlags;
+    function skipAlias(symbol: Symbol, checker: TypeChecker): Symbol;
+    /** See comment on `declareModuleMember` in `binder.ts`. */
+    function getCombinedLocalAndExportSymbolFlags(symbol: Symbol): SymbolFlags;
+    function isWriteOnlyAccess(node: Node): boolean;
+    function isWriteAccess(node: Node): boolean;
+    function compareDataObjects(dst: any, src: any): boolean;
+    /**
+     * clears already present map by calling onDeleteExistingValue callback before deleting that key/value
+     */
+    function clearMap<T>(map: Map<T>, onDeleteValue: (valueInMap: T, key: string) => void): void;
+    interface MutateMapOptions<T, U> {
+        createNewValue(key: string, valueInNewMap: U): T;
+        onDeleteValue(existingValue: T, key: string): void;
+        /**
+         * If present this is called with the key when there is value for that key both in new map as well as existing map provided
+         * Caller can then decide to update or remove this key.
+         * If the key is removed, caller will get callback of createNewValue for that key.
+         * If this callback is not provided, the value of such keys is not updated.
+         */
+        onExistingValue?(existingValue: T, valueInNewMap: U, key: string): void;
+    }
+    /**
+     * Mutates the map with newMap such that keys in map will be same as newMap.
+     */
+    function mutateMap<T, U>(map: Map<T>, newMap: ReadonlyMap<U>, options: MutateMapOptions<T, U>): void;
+    /** Calls `callback` on `directory` and every ancestor directory it has, returning the first defined result. */
+    function forEachAncestorDirectory<T>(directory: string, callback: (directory: string) => T | undefined): T | undefined;
+    function isAbstractConstructorType(type: Type): boolean;
+    function isAbstractConstructorSymbol(symbol: Symbol): boolean;
+    function getClassLikeDeclarationOfSymbol(symbol: Symbol): ClassLikeDeclaration | undefined;
+    function getObjectFlags(type: Type): ObjectFlags;
+    function typeHasCallOrConstructSignatures(type: Type, checker: TypeChecker): boolean;
+    function forSomeAncestorDirectory(directory: string, callback: (directory: string) => boolean): boolean;
+    function isUMDExportSymbol(symbol: Symbol | undefined): boolean | undefined;
+    function showModuleSpecifier({ moduleSpecifier }: ImportDeclaration): string;
+    function getLastChild(node: Node): Node | undefined;
+    /** Add a value to a set, and return true if it wasn't already present. */
+    function addToSeen(seen: Map<true>, key: string | number): boolean;
+    function addToSeen<T>(seen: Map<T>, key: string | number, value: T): boolean;
+    function isObjectTypeDeclaration(node: Node): node is ObjectTypeDeclaration;
+}
+declare namespace ts {
+    function getDefaultLibFileName(options: CompilerOptions): string;
+    function textSpanEnd(span: TextSpan): number;
+    function textSpanIsEmpty(span: TextSpan): boolean;
+    function textSpanContainsPosition(span: TextSpan, position: number): boolean;
+    function textSpanContainsTextSpan(span: TextSpan, other: TextSpan): boolean;
+    function textSpanOverlapsWith(span: TextSpan, other: TextSpan): boolean;
+    function textSpanOverlap(span1: TextSpan, span2: TextSpan): TextSpan | undefined;
+    function textSpanIntersectsWithTextSpan(span: TextSpan, other: TextSpan): boolean;
+    function textSpanIntersectsWith(span: TextSpan, start: number, length: number): boolean;
+    function decodedTextSpanIntersectsWith(start1: number, length1: number, start2: number, length2: number): boolean;
+    function textSpanIntersectsWithPosition(span: TextSpan, position: number): boolean;
+    function textSpanIntersection(span1: TextSpan, span2: TextSpan): TextSpan | undefined;
+    function createTextSpan(start: number, length: number): TextSpan;
+    function createTextRange(pos: number, end?: number): TextRange;
+    function createTextSpanFromBounds(start: number, end: number): TextSpan;
+    function textChangeRangeNewSpan(range: TextChangeRange): TextSpan;
+    function textChangeRangeIsUnchanged(range: TextChangeRange): boolean;
+    function createTextChangeRange(span: TextSpan, newLength: number): TextChangeRange;
+    let unchangedTextChangeRange: TextChangeRange;
+    /**
+     * Called to merge all the changes that occurred across several versions of a script snapshot
+     * into a single change.  i.e. if a user keeps making successive edits to a script we will
+     * have a text change from V1 to V2, V2 to V3, ..., Vn.
+     *
+     * This function will then merge those changes into a single change range valid between V1 and
+     * Vn.
+     */
+    function collapseTextChangeRangesAcrossMultipleVersions(changes: ReadonlyArray<TextChangeRange>): TextChangeRange;
+    function getTypeParameterOwner(d: Declaration): Declaration | undefined;
+    type ParameterPropertyDeclaration = ParameterDeclaration & {
+        parent: ConstructorDeclaration;
+        name: Identifier;
+    };
+    function isParameterPropertyDeclaration(node: Node): node is ParameterPropertyDeclaration;
+    function isEmptyBindingPattern(node: BindingName): node is BindingPattern;
+    function isEmptyBindingElement(node: BindingElement): boolean;
+    function getCombinedModifierFlags(node: Node): ModifierFlags;
+    function getCombinedNodeFlags(node: Node): NodeFlags;
+    /**
+     * Checks to see if the locale is in the appropriate format,
+     * and if it is, attempts to set the appropriate language.
+     */
+    function validateLocaleAndSetLanguage(locale: string, sys: {
+        getExecutingFilePath(): string;
+        resolvePath(path: string): string;
+        fileExists(fileName: string): boolean;
+        readFile(fileName: string): string | undefined;
+    }, errors?: Push<Diagnostic>): void;
+    function getOriginalNode(node: Node): Node;
+    function getOriginalNode<T extends Node>(node: Node, nodeTest: (node: Node) => node is T): T;
+    function getOriginalNode(node: Node | undefined): Node | undefined;
+    function getOriginalNode<T extends Node>(node: Node | undefined, nodeTest: (node: Node | undefined) => node is T): T | undefined;
+    /**
+     * Gets a value indicating whether a node originated in the parse tree.
+     *
+     * @param node The node to test.
+     */
+    function isParseTreeNode(node: Node): boolean;
+    /**
+     * Gets the original parse tree node for a node.
+     *
+     * @param node The original node.
+     * @returns The original parse tree node if found; otherwise, undefined.
+     */
+    function getParseTreeNode(node: Node): Node;
+    /**
+     * Gets the original parse tree node for a node.
+     *
+     * @param node The original node.
+     * @param nodeTest A callback used to ensure the correct type of parse tree node is returned.
+     * @returns The original parse tree node if found; otherwise, undefined.
+     */
+    function getParseTreeNode<T extends Node>(node: Node | undefined, nodeTest?: (node: Node) => node is T): T | undefined;
+    /**
+     * Remove extra underscore from escaped identifier text content.
+     *
+     * @param identifier The escaped identifier text.
+     * @returns The unescaped identifier text.
+     */
+    function unescapeLeadingUnderscores(identifier: __String): string;
+    function idText(identifier: Identifier): string;
+    function symbolName(symbol: Symbol): string;
+    /**
+     * Remove extra underscore from escaped identifier text content.
+     * @deprecated Use `id.text` for the unescaped text.
+     * @param identifier The escaped identifier text.
+     * @returns The unescaped identifier text.
+     */
+    function unescapeIdentifier(id: string): string;
+    function getNameOfJSDocTypedef(declaration: JSDocTypedefTag): Identifier | undefined;
+    /** @internal */
+    function isNamedDeclaration(node: Node): node is NamedDeclaration & {
+        name: DeclarationName;
+    };
+    function getNameOfDeclaration(declaration: Declaration | Expression): DeclarationName;
+    /**
+     * Gets the JSDoc parameter tags for the node if present.
+     *
+     * @remarks Returns any JSDoc param tag that matches the provided
+     * parameter, whether a param tag on a containing function
+     * expression, or a param tag on a variable declaration whose
+     * initializer is the containing function. The tags closest to the
+     * node are returned first, so in the previous example, the param
+     * tag on the containing function expression would be first.
+     *
+     * Does not return tags for binding patterns, because JSDoc matches
+     * parameters by name and binding patterns do not have a name.
+     */
+    function getJSDocParameterTags(param: ParameterDeclaration): ReadonlyArray<JSDocParameterTag>;
+    /**
+     * Return true if the node has JSDoc parameter tags.
+     *
+     * @remarks Includes parameter tags that are not directly on the node,
+     * for example on a variable declaration whose initializer is a function expression.
+     */
+    function hasJSDocParameterTags(node: FunctionLikeDeclaration | SignatureDeclaration): boolean;
+    /** Gets the JSDoc augments tag for the node if present */
+    function getJSDocAugmentsTag(node: Node): JSDocAugmentsTag | undefined;
+    /** Gets the JSDoc class tag for the node if present */
+    function getJSDocClassTag(node: Node): JSDocClassTag | undefined;
+    /** Gets the JSDoc return tag for the node if present */
+    function getJSDocReturnTag(node: Node): JSDocReturnTag | undefined;
+    /** Gets the JSDoc template tag for the node if present */
+    function getJSDocTemplateTag(node: Node): JSDocTemplateTag | undefined;
+    /** Gets the JSDoc type tag for the node if present and valid */
+    function getJSDocTypeTag(node: Node): JSDocTypeTag | undefined;
+    /**
+     * Gets the type node for the node if provided via JSDoc.
+     *
+     * @remarks The search includes any JSDoc param tag that relates
+     * to the provided parameter, for example a type tag on the
+     * parameter itself, or a param tag on a containing function
+     * expression, or a param tag on a variable declaration whose
+     * initializer is the containing function. The tags closest to the
+     * node are examined first, so in the previous example, the type
+     * tag directly on the node would be returned.
+     */
+    function getJSDocType(node: Node): TypeNode | undefined;
+    /**
+     * Gets the return type node for the node if provided via JSDoc's return tag.
+     *
+     * @remarks `getJSDocReturnTag` just gets the whole JSDoc tag. This function
+     * gets the type from inside the braces.
+     */
+    function getJSDocReturnType(node: Node): TypeNode | undefined;
+    /** Get all JSDoc tags related to a node, including those on parent nodes. */
+    function getJSDocTags(node: Node): ReadonlyArray<JSDocTag>;
+    /** Gets all JSDoc tags of a specified kind, or undefined if not present. */
+    function getAllJSDocTagsOfKind(node: Node, kind: SyntaxKind): ReadonlyArray<JSDocTag>;
+}
+declare namespace ts {
+    function isNumericLiteral(node: Node): node is NumericLiteral;
+    function isStringLiteral(node: Node): node is StringLiteral;
+    function isJsxText(node: Node): node is JsxText;
+    function isRegularExpressionLiteral(node: Node): node is RegularExpressionLiteral;
+    function isNoSubstitutionTemplateLiteral(node: Node): node is NoSubstitutionTemplateLiteral;
+    function isTemplateHead(node: Node): node is TemplateHead;
+    function isTemplateMiddle(node: Node): node is TemplateMiddle;
+    function isTemplateTail(node: Node): node is TemplateTail;
+    function isIdentifier(node: Node): node is Identifier;
+    function isQualifiedName(node: Node): node is QualifiedName;
+    function isComputedPropertyName(node: Node): node is ComputedPropertyName;
+    function isTypeParameterDeclaration(node: Node): node is TypeParameterDeclaration;
+    function isParameter(node: Node): node is ParameterDeclaration;
+    function isDecorator(node: Node): node is Decorator;
+    function isPropertySignature(node: Node): node is PropertySignature;
+    function isPropertyDeclaration(node: Node): node is PropertyDeclaration;
+    function isMethodSignature(node: Node): node is MethodSignature;
+    function isMethodDeclaration(node: Node): node is MethodDeclaration;
+    function isConstructorDeclaration(node: Node): node is ConstructorDeclaration;
+    function isGetAccessorDeclaration(node: Node): node is GetAccessorDeclaration;
+    function isSetAccessorDeclaration(node: Node): node is SetAccessorDeclaration;
+    function isCallSignatureDeclaration(node: Node): node is CallSignatureDeclaration;
+    function isConstructSignatureDeclaration(node: Node): node is ConstructSignatureDeclaration;
+    function isIndexSignatureDeclaration(node: Node): node is IndexSignatureDeclaration;
+    function isGetOrSetAccessorDeclaration(node: Node): node is AccessorDeclaration;
+    function isTypePredicateNode(node: Node): node is TypePredicateNode;
+    function isTypeReferenceNode(node: Node): node is TypeReferenceNode;
+    function isFunctionTypeNode(node: Node): node is FunctionTypeNode;
+    function isConstructorTypeNode(node: Node): node is ConstructorTypeNode;
+    function isTypeQueryNode(node: Node): node is TypeQueryNode;
+    function isTypeLiteralNode(node: Node): node is TypeLiteralNode;
+    function isArrayTypeNode(node: Node): node is ArrayTypeNode;
+    function isTupleTypeNode(node: Node): node is TupleTypeNode;
+    function isUnionTypeNode(node: Node): node is UnionTypeNode;
+    function isIntersectionTypeNode(node: Node): node is IntersectionTypeNode;
+    function isConditionalTypeNode(node: Node): node is ConditionalTypeNode;
+    function isInferTypeNode(node: Node): node is InferTypeNode;
+    function isParenthesizedTypeNode(node: Node): node is ParenthesizedTypeNode;
+    function isThisTypeNode(node: Node): node is ThisTypeNode;
+    function isTypeOperatorNode(node: Node): node is TypeOperatorNode;
+    function isIndexedAccessTypeNode(node: Node): node is IndexedAccessTypeNode;
+    function isMappedTypeNode(node: Node): node is MappedTypeNode;
+    function isLiteralTypeNode(node: Node): node is LiteralTypeNode;
+    function isImportTypeNode(node: Node): node is ImportTypeNode;
+    function isObjectBindingPattern(node: Node): node is ObjectBindingPattern;
+    function isArrayBindingPattern(node: Node): node is ArrayBindingPattern;
+    function isBindingElement(node: Node): node is BindingElement;
+    function isArrayLiteralExpression(node: Node): node is ArrayLiteralExpression;
+    function isObjectLiteralExpression(node: Node): node is ObjectLiteralExpression;
+    function isPropertyAccessExpression(node: Node): node is PropertyAccessExpression;
+    function isElementAccessExpression(node: Node): node is ElementAccessExpression;
+    function isCallExpression(node: Node): node is CallExpression;
+    function isNewExpression(node: Node): node is NewExpression;
+    function isTaggedTemplateExpression(node: Node): node is TaggedTemplateExpression;
+    function isTypeAssertion(node: Node): node is TypeAssertion;
+    function isParenthesizedExpression(node: Node): node is ParenthesizedExpression;
+    function skipPartiallyEmittedExpressions(node: Expression): Expression;
+    function skipPartiallyEmittedExpressions(node: Node): Node;
+    function isFunctionExpression(node: Node): node is FunctionExpression;
+    function isArrowFunction(node: Node): node is ArrowFunction;
+    function isDeleteExpression(node: Node): node is DeleteExpression;
+    function isTypeOfExpression(node: Node): node is TypeOfExpression;
+    function isVoidExpression(node: Node): node is VoidExpression;
+    function isAwaitExpression(node: Node): node is AwaitExpression;
+    function isPrefixUnaryExpression(node: Node): node is PrefixUnaryExpression;
+    function isPostfixUnaryExpression(node: Node): node is PostfixUnaryExpression;
+    function isBinaryExpression(node: Node): node is BinaryExpression;
+    function isConditionalExpression(node: Node): node is ConditionalExpression;
+    function isTemplateExpression(node: Node): node is TemplateExpression;
+    function isYieldExpression(node: Node): node is YieldExpression;
+    function isSpreadElement(node: Node): node is SpreadElement;
+    function isClassExpression(node: Node): node is ClassExpression;
+    function isOmittedExpression(node: Node): node is OmittedExpression;
+    function isExpressionWithTypeArguments(node: Node): node is ExpressionWithTypeArguments;
+    function isAsExpression(node: Node): node is AsExpression;
+    function isNonNullExpression(node: Node): node is NonNullExpression;
+    function isMetaProperty(node: Node): node is MetaProperty;
+    function isTemplateSpan(node: Node): node is TemplateSpan;
+    function isSemicolonClassElement(node: Node): node is SemicolonClassElement;
+    function isBlock(node: Node): node is Block;
+    function isVariableStatement(node: Node): node is VariableStatement;
+    function isEmptyStatement(node: Node): node is EmptyStatement;
+    function isExpressionStatement(node: Node): node is ExpressionStatement;
+    function isIfStatement(node: Node): node is IfStatement;
+    function isDoStatement(node: Node): node is DoStatement;
+    function isWhileStatement(node: Node): node is WhileStatement;
+    function isForStatement(node: Node): node is ForStatement;
+    function isForInStatement(node: Node): node is ForInStatement;
+    function isForOfStatement(node: Node): node is ForOfStatement;
+    function isContinueStatement(node: Node): node is ContinueStatement;
+    function isBreakStatement(node: Node): node is BreakStatement;
+    function isBreakOrContinueStatement(node: Node): node is BreakOrContinueStatement;
+    function isReturnStatement(node: Node): node is ReturnStatement;
+    function isWithStatement(node: Node): node is WithStatement;
+    function isSwitchStatement(node: Node): node is SwitchStatement;
+    function isLabeledStatement(node: Node): node is LabeledStatement;
+    function isThrowStatement(node: Node): node is ThrowStatement;
+    function isTryStatement(node: Node): node is TryStatement;
+    function isDebuggerStatement(node: Node): node is DebuggerStatement;
+    function isVariableDeclaration(node: Node): node is VariableDeclaration;
+    function isVariableDeclarationList(node: Node): node is VariableDeclarationList;
+    function isFunctionDeclaration(node: Node): node is FunctionDeclaration;
+    function isClassDeclaration(node: Node): node is ClassDeclaration;
+    function isInterfaceDeclaration(node: Node): node is InterfaceDeclaration;
+    function isTypeAliasDeclaration(node: Node): node is TypeAliasDeclaration;
+    function isEnumDeclaration(node: Node): node is EnumDeclaration;
+    function isModuleDeclaration(node: Node): node is ModuleDeclaration;
+    function isModuleBlock(node: Node): node is ModuleBlock;
+    function isCaseBlock(node: Node): node is CaseBlock;
+    function isNamespaceExportDeclaration(node: Node): node is NamespaceExportDeclaration;
+    function isImportEqualsDeclaration(node: Node): node is ImportEqualsDeclaration;
+    function isImportDeclaration(node: Node): node is ImportDeclaration;
+    function isImportClause(node: Node): node is ImportClause;
+    function isNamespaceImport(node: Node): node is NamespaceImport;
+    function isNamedImports(node: Node): node is NamedImports;
+    function isImportSpecifier(node: Node): node is ImportSpecifier;
+    function isExportAssignment(node: Node): node is ExportAssignment;
+    function isExportDeclaration(node: Node): node is ExportDeclaration;
+    function isNamedExports(node: Node): node is NamedExports;
+    function isExportSpecifier(node: Node): node is ExportSpecifier;
+    function isMissingDeclaration(node: Node): node is MissingDeclaration;
+    function isExternalModuleReference(node: Node): node is ExternalModuleReference;
+    function isJsxElement(node: Node): node is JsxElement;
+    function isJsxSelfClosingElement(node: Node): node is JsxSelfClosingElement;
+    function isJsxOpeningElement(node: Node): node is JsxOpeningElement;
+    function isJsxClosingElement(node: Node): node is JsxClosingElement;
+    function isJsxFragment(node: Node): node is JsxFragment;
+    function isJsxOpeningFragment(node: Node): node is JsxOpeningFragment;
+    function isJsxClosingFragment(node: Node): node is JsxClosingFragment;
+    function isJsxAttribute(node: Node): node is JsxAttribute;
+    function isJsxAttributes(node: Node): node is JsxAttributes;
+    function isJsxSpreadAttribute(node: Node): node is JsxSpreadAttribute;
+    function isJsxExpression(node: Node): node is JsxExpression;
+    function isCaseClause(node: Node): node is CaseClause;
+    function isDefaultClause(node: Node): node is DefaultClause;
+    function isHeritageClause(node: Node): node is HeritageClause;
+    function isCatchClause(node: Node): node is CatchClause;
+    function isPropertyAssignment(node: Node): node is PropertyAssignment;
+    function isShorthandPropertyAssignment(node: Node): node is ShorthandPropertyAssignment;
+    function isSpreadAssignment(node: Node): node is SpreadAssignment;
+    function isEnumMember(node: Node): node is EnumMember;
+    function isSourceFile(node: Node): node is SourceFile;
+    function isBundle(node: Node): node is Bundle;
+    function isUnparsedSource(node: Node): node is UnparsedSource;
+    function isJSDocTypeExpression(node: Node): node is JSDocTypeExpression;
+    function isJSDocAllType(node: JSDocAllType): node is JSDocAllType;
+    function isJSDocUnknownType(node: Node): node is JSDocUnknownType;
+    function isJSDocNullableType(node: Node): node is JSDocNullableType;
+    function isJSDocNonNullableType(node: Node): node is JSDocNonNullableType;
+    function isJSDocOptionalType(node: Node): node is JSDocOptionalType;
+    function isJSDocFunctionType(node: Node): node is JSDocFunctionType;
+    function isJSDocVariadicType(node: Node): node is JSDocVariadicType;
+    function isJSDoc(node: Node): node is JSDoc;
+    function isJSDocAugmentsTag(node: Node): node is JSDocAugmentsTag;
+    function isJSDocClassTag(node: Node): node is JSDocClassTag;
+    function isJSDocParameterTag(node: Node): node is JSDocParameterTag;
+    function isJSDocReturnTag(node: Node): node is JSDocReturnTag;
+    function isJSDocTypeTag(node: Node): node is JSDocTypeTag;
+    function isJSDocTemplateTag(node: Node): node is JSDocTemplateTag;
+    function isJSDocTypedefTag(node: Node): node is JSDocTypedefTag;
+    function isJSDocPropertyTag(node: Node): node is JSDocPropertyTag;
+    function isJSDocPropertyLikeTag(node: Node): node is JSDocPropertyLikeTag;
+    function isJSDocTypeLiteral(node: Node): node is JSDocTypeLiteral;
+    function isJSDocCallbackTag(node: Node): node is JSDocCallbackTag;
+    function isJSDocSignature(node: Node): node is JSDocSignature;
+}
+declare namespace ts {
+    function isSyntaxList(n: Node): n is SyntaxList;
+    function isNode(node: Node): boolean;
+    function isNodeKind(kind: SyntaxKind): boolean;
+    /**
+     * True if node is of some token syntax kind.
+     * For example, this is true for an IfKeyword but not for an IfStatement.
+     * Literals are considered tokens, except TemplateLiteral, but does include TemplateHead/Middle/Tail.
+     */
+    function isToken(n: Node): boolean;
+    function isNodeArray<T extends Node>(array: ReadonlyArray<T>): array is NodeArray<T>;
+    function isLiteralKind(kind: SyntaxKind): boolean;
+    function isLiteralExpression(node: Node): node is LiteralExpression;
+    function isTemplateLiteralKind(kind: SyntaxKind): boolean;
+    type TemplateLiteralToken = NoSubstitutionTemplateLiteral | TemplateHead | TemplateMiddle | TemplateTail;
+    function isTemplateLiteralToken(node: Node): node is TemplateLiteralToken;
+    function isTemplateMiddleOrTemplateTail(node: Node): node is TemplateMiddle | TemplateTail;
+    function isStringTextContainingNode(node: Node): node is StringLiteral | TemplateLiteralToken;
+    function isGeneratedIdentifier(node: Node): node is GeneratedIdentifier;
+    function isModifierKind(token: SyntaxKind): boolean;
+    function isParameterPropertyModifier(kind: SyntaxKind): boolean;
+    function isClassMemberModifier(idToken: SyntaxKind): boolean;
+    function isModifier(node: Node): node is Modifier;
+    function isEntityName(node: Node): node is EntityName;
+    function isPropertyName(node: Node): node is PropertyName;
+    function isBindingName(node: Node): node is BindingName;
+    function isFunctionLike(node: Node): node is SignatureDeclaration;
+    function isFunctionLikeDeclaration(node: Node): node is FunctionLikeDeclaration;
+    function isFunctionLikeKind(kind: SyntaxKind): boolean;
+    function isFunctionOrModuleBlock(node: Node): boolean;
+    function isClassElement(node: Node): node is ClassElement;
+    function isClassLike(node: Node): node is ClassLikeDeclaration;
+    function isAccessor(node: Node): node is AccessorDeclaration;
+    function isMethodOrAccessor(node: Node): node is MethodDeclaration | AccessorDeclaration;
+    function isTypeElement(node: Node): node is TypeElement;
+    function isClassOrTypeElement(node: Node): node is ClassElement | TypeElement;
+    function isObjectLiteralElementLike(node: Node): node is ObjectLiteralElementLike;
+    /**
+     * Node test that determines whether a node is a valid type node.
+     * This differs from the `isPartOfTypeNode` function which determines whether a node is *part*
+     * of a TypeNode.
+     */
+    function isTypeNode(node: Node): node is TypeNode;
+    function isFunctionOrConstructorTypeNode(node: Node): node is FunctionTypeNode | ConstructorTypeNode;
+    function isBindingPattern(node: Node | undefined): node is BindingPattern;
+    function isAssignmentPattern(node: Node): node is AssignmentPattern;
+    function isArrayBindingElement(node: Node): node is ArrayBindingElement;
+    /**
+     * Determines whether the BindingOrAssignmentElement is a BindingElement-like declaration
+     */
+    function isDeclarationBindingElement(bindingElement: BindingOrAssignmentElement): bindingElement is VariableDeclaration | ParameterDeclaration | BindingElement;
+    /**
+     * Determines whether a node is a BindingOrAssignmentPattern
+     */
+    function isBindingOrAssignmentPattern(node: BindingOrAssignmentElementTarget): node is BindingOrAssignmentPattern;
+    /**
+     * Determines whether a node is an ObjectBindingOrAssignmentPattern
+     */
+    function isObjectBindingOrAssignmentPattern(node: BindingOrAssignmentElementTarget): node is ObjectBindingOrAssignmentPattern;
+    /**
+     * Determines whether a node is an ArrayBindingOrAssignmentPattern
+     */
+    function isArrayBindingOrAssignmentPattern(node: BindingOrAssignmentElementTarget): node is ArrayBindingOrAssignmentPattern;
+    function isPropertyAccessOrQualifiedNameOrImportTypeNode(node: Node): node is PropertyAccessExpression | QualifiedName | ImportTypeNode;
+    function isPropertyAccessOrQualifiedName(node: Node): node is PropertyAccessExpression | QualifiedName;
+    function isCallLikeExpression(node: Node): node is CallLikeExpression;
+    function isCallOrNewExpression(node: Node): node is CallExpression | NewExpression;
+    function isTemplateLiteral(node: Node): node is TemplateLiteral;
+    function isLeftHandSideExpression(node: Node): node is LeftHandSideExpression;
+    function isUnaryExpression(node: Node): node is UnaryExpression;
+    function isUnaryExpressionWithWrite(expr: Node): expr is PrefixUnaryExpression | PostfixUnaryExpression;
+    /**
+     * Determines whether a node is an expression based only on its kind.
+     * Use `isExpressionNode` if not in transforms.
+     */
+    function isExpression(node: Node): node is Expression;
+    function isAssertionExpression(node: Node): node is AssertionExpression;
+    function isPartiallyEmittedExpression(node: Node): node is PartiallyEmittedExpression;
+    function isNotEmittedStatement(node: Node): node is NotEmittedStatement;
+    function isNotEmittedOrPartiallyEmittedNode(node: Node): node is NotEmittedStatement | PartiallyEmittedExpression;
+    function isIterationStatement(node: Node, lookInLabeledStatements: false): node is IterationStatement;
+    function isIterationStatement(node: Node, lookInLabeledStatements: boolean): node is IterationStatement | LabeledStatement;
+    function isForInOrOfStatement(node: Node): node is ForInOrOfStatement;
+    function isConciseBody(node: Node): node is ConciseBody;
+    function isFunctionBody(node: Node): node is FunctionBody;
+    function isForInitializer(node: Node): node is ForInitializer;
+    function isModuleBody(node: Node): node is ModuleBody;
+    function isNamespaceBody(node: Node): node is NamespaceBody;
+    function isJSDocNamespaceBody(node: Node): node is JSDocNamespaceBody;
+    function isNamedImportBindings(node: Node): node is NamedImportBindings;
+    function isModuleOrEnumDeclaration(node: Node): node is ModuleDeclaration | EnumDeclaration;
+    function isDeclaration(node: Node): node is NamedDeclaration;
+    function isDeclarationStatement(node: Node): node is DeclarationStatement;
+    /**
+     * Determines whether the node is a statement that is not also a declaration
+     */
+    function isStatementButNotDeclaration(node: Node): node is Statement;
+    function isStatement(node: Node): node is Statement;
+    function isModuleReference(node: Node): node is ModuleReference;
+    function isJsxTagNameExpression(node: Node): node is JsxTagNameExpression;
+    function isJsxChild(node: Node): node is JsxChild;
+    function isJsxAttributeLike(node: Node): node is JsxAttributeLike;
+    function isStringLiteralOrJsxExpression(node: Node): node is StringLiteral | JsxExpression;
+    function isJsxOpeningLikeElement(node: Node): node is JsxOpeningLikeElement;
+    function isCaseOrDefaultClause(node: Node): node is CaseOrDefaultClause;
+    /** True if node is of some JSDoc syntax kind. */
+    function isJSDocNode(node: Node): boolean;
+    /** True if node is of a kind that may contain comment text. */
+    function isJSDocCommentContainingNode(node: Node): boolean;
+    function isJSDocTag(node: Node): boolean;
+    function isSetAccessor(node: Node): node is SetAccessorDeclaration;
+    function isGetAccessor(node: Node): node is GetAccessorDeclaration;
+    /** True if has jsdoc nodes attached to it. */
+    function hasJSDocNodes(node: Node): node is HasJSDoc;
+    /** True if has type node attached to it. */
+    function hasType(node: Node): node is HasType;
+    function couldHaveType(node: Node): node is HasType;
+    /** True if has initializer node attached to it. */
+    function hasInitializer(node: Node): node is HasInitializer;
+    /** True if has initializer node attached to it. */
+    function hasOnlyExpressionInitializer(node: Node): node is HasExpressionInitializer;
+    function isObjectLiteralElement(node: Node): node is ObjectLiteralElement;
+    function isTypeReferenceType(node: Node): node is TypeReferenceType;
+    function guessIndentation(lines: string[]): number | undefined;
+    function isStringLiteralLike(node: Node): node is StringLiteralLike;
+    /** @internal */
+    function isNamedImportsOrExports(node: Node): node is NamedImportsOrExports;
+    interface ObjectAllocator {
+        getNodeConstructor(): new (kind: SyntaxKind, pos?: number, end?: number) => Node;
+        getTokenConstructor(): new <TKind extends SyntaxKind>(kind: TKind, pos?: number, end?: number) => Token<TKind>;
+        getIdentifierConstructor(): new (kind: SyntaxKind.Identifier, pos?: number, end?: number) => Identifier;
+        getSourceFileConstructor(): new (kind: SyntaxKind.SourceFile, pos?: number, end?: number) => SourceFile;
+        getSymbolConstructor(): new (flags: SymbolFlags, name: __String) => Symbol;
+        getTypeConstructor(): new (checker: TypeChecker, flags: TypeFlags) => Type;
+        getSignatureConstructor(): new (checker: TypeChecker) => Signature;
+        getSourceMapSourceConstructor(): new (fileName: string, text: string, skipTrivia?: (pos: number) => number) => SourceMapSource;
+    }
+    let objectAllocator: ObjectAllocator;
+    function formatStringFromArgs(text: string, args: ArrayLike<string>, baseIndex?: number): string;
+    let localizedDiagnosticMessages: MapLike<string> | undefined;
+    function getLocaleSpecificMessage(message: DiagnosticMessage): string;
+    function createFileDiagnostic(file: SourceFile, start: number, length: number, message: DiagnosticMessage, ...args: (string | number | undefined)[]): DiagnosticWithLocation;
+    function formatMessage(_dummy: any, message: DiagnosticMessage): string;
+    function createCompilerDiagnostic(message: DiagnosticMessage, ...args: (string | number | undefined)[]): Diagnostic;
+    function createCompilerDiagnosticFromMessageChain(chain: DiagnosticMessageChain): Diagnostic;
+    function chainDiagnosticMessages(details: DiagnosticMessageChain | undefined, message: DiagnosticMessage, ...args: (string | undefined)[]): DiagnosticMessageChain;
+    function concatenateDiagnosticMessageChains(headChain: DiagnosticMessageChain, tailChain: DiagnosticMessageChain): DiagnosticMessageChain;
+    function compareDiagnostics(d1: Diagnostic, d2: Diagnostic): Comparison;
+    function getEmitScriptTarget(compilerOptions: CompilerOptions): ScriptTarget;
+    function getEmitModuleKind(compilerOptions: {
+        module?: CompilerOptions["module"];
+        target?: CompilerOptions["target"];
+    }): ModuleKind;
+    function getEmitModuleResolutionKind(compilerOptions: CompilerOptions): ModuleResolutionKind;
+    function unreachableCodeIsError(options: CompilerOptions): boolean;
+    function unusedLabelIsError(options: CompilerOptions): boolean;
+    function getAreDeclarationMapsEnabled(options: CompilerOptions): boolean;
+    function getAllowSyntheticDefaultImports(compilerOptions: CompilerOptions): boolean;
+    function getEmitDeclarations(compilerOptions: CompilerOptions): boolean;
+    type StrictOptionName = "noImplicitAny" | "noImplicitThis" | "strictNullChecks" | "strictFunctionTypes" | "strictPropertyInitialization" | "alwaysStrict";
+    function getStrictOptionValue(compilerOptions: CompilerOptions, flag: StrictOptionName): boolean;
+    function hasZeroOrOneAsteriskCharacter(str: string): boolean;
+    /**
+     * Internally, we represent paths as strings with '/' as the directory separator.
+     * When we make system calls (eg: LanguageServiceHost.getDirectory()),
+     * we expect the host to correctly handle paths in our specified format.
+     */
+    const directorySeparator = "/";
+    /**
+     * Normalize path separators.
+     */
+    function normalizeSlashes(path: string): string;
+    /**
+     * Returns length of the root part of a path or URL (i.e. length of "/", "x:/", "//server/share/, file:///user/files").
+     *
+     * For example:
+     * ```ts
+     * getRootLength("a") === 0                   // ""
+     * getRootLength("/") === 1                   // "/"
+     * getRootLength("c:") === 2                  // "c:"
+     * getRootLength("c:d") === 0                 // ""
+     * getRootLength("c:/") === 3                 // "c:/"
+     * getRootLength("c:\\") === 3                // "c:\\"
+     * getRootLength("//server") === 7            // "//server"
+     * getRootLength("//server/share") === 8      // "//server/"
+     * getRootLength("\\\\server") === 7          // "\\\\server"
+     * getRootLength("\\\\server\\share") === 8   // "\\\\server\\"
+     * getRootLength("file:///path") === 8        // "file:///"
+     * getRootLength("file:///c:") === 10         // "file:///c:"
+     * getRootLength("file:///c:d") === 8         // "file:///"
+     * getRootLength("file:///c:/path") === 11    // "file:///c:/"
+     * getRootLength("file://server") === 13      // "file://server"
+     * getRootLength("file://server/path") === 14 // "file://server/"
+     * getRootLength("http://server") === 13      // "http://server"
+     * getRootLength("http://server/path") === 14 // "http://server/"
+     * ```
+     */
+    function getRootLength(path: string): number;
+    function normalizePath(path: string): string;
+    function normalizePathAndParts(path: string): {
+        path: string;
+        parts: string[];
+    };
+    /**
+     * Returns the path except for its basename. Semantics align with NodeJS's `path.dirname`
+     * except that we support URL's as well.
+     *
+     * ```ts
+     * getDirectoryPath("/path/to/file.ext") === "/path/to"
+     * getDirectoryPath("/path/to/") === "/path"
+     * getDirectoryPath("/") === "/"
+     * ```
+     */
+    function getDirectoryPath(path: Path): Path;
+    /**
+     * Returns the path except for its basename. Semantics align with NodeJS's `path.dirname`
+     * except that we support URL's as well.
+     *
+     * ```ts
+     * getDirectoryPath("/path/to/file.ext") === "/path/to"
+     * getDirectoryPath("/path/to/") === "/path"
+     * getDirectoryPath("/") === "/"
+     * ```
+     */
+    function getDirectoryPath(path: string): string;
+    function isUrl(path: string): boolean;
+    function pathIsRelative(path: string): boolean;
+    /**
+     * Determines whether a path is an absolute path (e.g. starts with `/`, or a dos path
+     * like `c:`, `c:\` or `c:/`).
+     */
+    function isRootedDiskPath(path: string): boolean;
+    /**
+     * Determines whether a path consists only of a path root.
+     */
+    function isDiskPathRoot(path: string): boolean;
+    function convertToRelativePath(absoluteOrRelativePath: string, basePath: string, getCanonicalFileName: (path: string) => string): string;
+    /**
+     * Parse a path into an array containing a root component (at index 0) and zero or more path
+     * components (at indices > 0). The result is not normalized.
+     * If the path is relative, the root component is `""`.
+     * If the path is absolute, the root component includes the first path separator (`/`).
+     */
+    function getPathComponents(path: string, currentDirectory?: string): string[];
+    /**
+     * Reduce an array of path components to a more simplified path by navigating any
+     * `"."` or `".."` entries in the path.
+     */
+    function reducePathComponents(components: ReadonlyArray<string>): string[];
+    /**
+     * Parse a path into an array containing a root component (at index 0) and zero or more path
+     * components (at indices > 0). The result is normalized.
+     * If the path is relative, the root component is `""`.
+     * If the path is absolute, the root component includes the first path separator (`/`).
+     */
+    function getNormalizedPathComponents(path: string, currentDirectory: string | undefined): string[];
+    function getNormalizedAbsolutePath(fileName: string, currentDirectory: string | undefined): string;
+    /**
+     * Formats a parsed path consisting of a root component (at index 0) and zero or more path
+     * segments (at indices > 0).
+     */
+    function getPathFromPathComponents(pathComponents: ReadonlyArray<string>): string;
+    function getRelativePathFromFile(from: string, to: string, getCanonicalFileName: GetCanonicalFileName): string;
+    /**
+     * Gets a relative path that can be used to traverse between `from` and `to`.
+     */
+    function getRelativePathFromDirectory(from: string, to: string, ignoreCase: boolean): string;
+    /**
+     * Gets a relative path that can be used to traverse between `from` and `to`.
+     */
+    function getRelativePathFromDirectory(fromDirectory: string, to: string, getCanonicalFileName: GetCanonicalFileName): string;
+    function getRelativePathToDirectoryOrUrl(directoryPathOrUrl: string, relativeOrAbsolutePath: string, currentDirectory: string, getCanonicalFileName: GetCanonicalFileName, isAbsolutePathAnUrl: boolean): string;
+    /**
+     * Ensures a path is either absolute (prefixed with `/` or `c:`) or dot-relative (prefixed
+     * with `./` or `../`) so as not to be confused with an unprefixed module name.
+     */
+    function ensurePathIsNonModuleName(path: string): string;
+    /**
+     * Returns the path except for its containing directory name.
+     * Semantics align with NodeJS's `path.basename` except that we support URL's as well.
+     *
+     * ```ts
+     * getBaseFileName("/path/to/file.ext") === "file.ext"
+     * getBaseFileName("/path/to/") === "to"
+     * getBaseFileName("/") === ""
+     * ```
+     */
+    function getBaseFileName(path: string): string;
+    /**
+     * Gets the portion of a path following the last (non-terminal) separator (`/`).
+     * Semantics align with NodeJS's `path.basename` except that we support URL's as well.
+     * If the base name has any one of the provided extensions, it is removed.
+     *
+     * ```ts
+     * getBaseFileName("/path/to/file.ext", ".ext", true) === "file"
+     * getBaseFileName("/path/to/file.js", ".ext", true) === "file.js"
+     * ```
+     */
+    function getBaseFileName(path: string, extensions: string | ReadonlyArray<string>, ignoreCase: boolean): string;
+    /**
+     * Combines paths. If a path is absolute, it replaces any previous path.
+     */
+    function combinePaths(path: string, ...paths: (string | undefined)[]): string;
+    /**
+     * Combines and resolves paths. If a path is absolute, it replaces any previous path. Any
+     * `.` and `..` path components are resolved.
+     */
+    function resolvePath(path: string, ...paths: (string | undefined)[]): string;
+    /**
+     * Determines whether a path has a trailing separator (`/` or `\\`).
+     */
+    function hasTrailingDirectorySeparator(path: string): boolean;
+    /**
+     * Removes a trailing directory separator from a path.
+     * @param path The path.
+     */
+    function removeTrailingDirectorySeparator(path: Path): Path;
+    function removeTrailingDirectorySeparator(path: string): string;
+    /**
+     * Adds a trailing directory separator to a path, if it does not already have one.
+     * @param path The path.
+     */
+    function ensureTrailingDirectorySeparator(path: Path): Path;
+    function ensureTrailingDirectorySeparator(path: string): string;
+    /**
+     * Performs a case-sensitive comparison of two paths.
+     */
+    function comparePathsCaseSensitive(a: string, b: string): Comparison;
+    /**
+     * Performs a case-insensitive comparison of two paths.
+     */
+    function comparePathsCaseInsensitive(a: string, b: string): Comparison;
+    function comparePaths(a: string, b: string, ignoreCase?: boolean): Comparison;
+    function comparePaths(a: string, b: string, currentDirectory: string, ignoreCase?: boolean): Comparison;
+    function containsPath(parent: string, child: string, ignoreCase?: boolean): boolean;
+    function containsPath(parent: string, child: string, currentDirectory: string, ignoreCase?: boolean): boolean;
+    function tryRemoveDirectoryPrefix(path: string, dirPath: string): string | undefined;
+    function hasExtension(fileName: string): boolean;
+    const commonPackageFolders: ReadonlyArray<string>;
+    function getRegularExpressionForWildcard(specs: ReadonlyArray<string> | undefined, basePath: string, usage: "files" | "directories" | "exclude"): string | undefined;
+    /**
+     * An "includes" path "foo" is implicitly a glob "foo/** /*" (without the space) if its last component has no extension,
+     * and does not contain any glob characters itself.
+     */
+    function isImplicitGlob(lastPathComponent: string): boolean;
+    interface FileSystemEntries {
+        readonly files: ReadonlyArray<string>;
+        readonly directories: ReadonlyArray<string>;
+    }
+    interface FileMatcherPatterns {
+        /** One pattern for each "include" spec. */
+        includeFilePatterns: ReadonlyArray<string> | undefined;
+        /** One pattern matching one of any of the "include" specs. */
+        includeFilePattern: string | undefined;
+        includeDirectoryPattern: string | undefined;
+        excludePattern: string | undefined;
+        basePaths: ReadonlyArray<string>;
+    }
+    /** @param path directory of the tsconfig.json */
+    function getFileMatcherPatterns(path: string, excludes: ReadonlyArray<string> | undefined, includes: ReadonlyArray<string> | undefined, useCaseSensitiveFileNames: boolean, currentDirectory: string): FileMatcherPatterns;
+    function getRegexFromPattern(pattern: string, useCaseSensitiveFileNames: boolean): RegExp;
+    /** @param path directory of the tsconfig.json */
+    function matchFiles(path: string, extensions: ReadonlyArray<string> | undefined, excludes: ReadonlyArray<string> | undefined, includes: ReadonlyArray<string> | undefined, useCaseSensitiveFileNames: boolean, currentDirectory: string, depth: number | undefined, getFileSystemEntries: (path: string) => FileSystemEntries): string[];
+    function ensureScriptKind(fileName: string, scriptKind: ScriptKind | undefined): ScriptKind;
+    function getScriptKindFromFileName(fileName: string): ScriptKind;
+    /**
+     *  List of supported extensions in order of file resolution precedence.
+     */
+    const supportedTypeScriptExtensions: ReadonlyArray<Extension>;
+    /** Must have ".d.ts" first because if ".ts" goes first, that will be detected as the extension instead of ".d.ts". */
+    const supportedTypescriptExtensionsForExtractExtension: ReadonlyArray<Extension>;
+    const supportedJavascriptExtensions: ReadonlyArray<Extension>;
+    function getSupportedExtensions(options?: CompilerOptions, extraFileExtensions?: ReadonlyArray<FileExtensionInfo>): ReadonlyArray<string>;
+    function hasJavaScriptFileExtension(fileName: string): boolean;
+    function hasTypeScriptFileExtension(fileName: string): boolean;
+    function isSupportedSourceFileName(fileName: string, compilerOptions?: CompilerOptions, extraFileExtensions?: ReadonlyArray<FileExtensionInfo>): boolean;
+    /**
+     * Extension boundaries by priority. Lower numbers indicate higher priorities, and are
+     * aligned to the offset of the highest priority extension in the
+     * allSupportedExtensions array.
+     */
+    enum ExtensionPriority {
+        TypeScriptFiles = 0,
+        DeclarationAndJavaScriptFiles = 2,
+        Highest = 0,
+        Lowest = 2
+    }
+    function getExtensionPriority(path: string, supportedExtensions: ReadonlyArray<string>): ExtensionPriority;
+    /**
+     * Adjusts an extension priority to be the highest priority within the same range.
+     */
+    function adjustExtensionPriority(extensionPriority: ExtensionPriority, supportedExtensions: ReadonlyArray<string>): ExtensionPriority;
+    /**
+     * Gets the next lowest extension priority for a given priority.
+     */
+    function getNextLowestExtensionPriority(extensionPriority: ExtensionPriority, supportedExtensions: ReadonlyArray<string>): ExtensionPriority;
+    function removeFileExtension(path: string): string;
+    function tryRemoveExtension(path: string, extension: string): string | undefined;
+    function removeExtension(path: string, extension: string): string;
+    function changeExtension<T extends string | Path>(path: T, newExtension: string): T;
+    function changeAnyExtension(path: string, ext: string): string;
+    function changeAnyExtension(path: string, ext: string, extensions: string | ReadonlyArray<string>, ignoreCase: boolean): string;
+    namespace Debug {
+        function showSymbol(symbol: Symbol): string;
+        function showSyntaxKind(node: Node): string;
+    }
+    function tryParsePattern(pattern: string): Pattern | undefined;
+    function positionIsSynthesized(pos: number): boolean;
+    /** True if an extension is one of the supported TypeScript extensions. */
+    function extensionIsTypeScript(ext: Extension): boolean;
+    function resolutionExtensionIsTypeScriptOrJson(ext: Extension): boolean;
+    /**
+     * Gets the extension from a path.
+     * Path must have a valid extension.
+     */
+    function extensionFromPath(path: string): Extension;
+    function isAnySupportedFileExtension(path: string): boolean;
+    function tryGetExtensionFromPath(path: string): Extension | undefined;
+    /**
+     * Gets the file extension for a path.
+     */
+    function getAnyExtensionFromPath(path: string): string;
+    /**
+     * Gets the file extension for a path, provided it is one of the provided extensions.
+     */
+    function getAnyExtensionFromPath(path: string, extensions: string | ReadonlyArray<string>, ignoreCase: boolean): string;
+    function isCheckJsEnabledForFile(sourceFile: SourceFile, compilerOptions: CompilerOptions): boolean | undefined;
+    const emptyFileSystemEntries: FileSystemEntries;
+    /**
+     * patternStrings contains both pattern strings (containing "*") and regular strings.
+     * Return an exact match if possible, or a pattern match, or undefined.
+     * (These are verified by verifyCompilerOptions to have 0 or 1 "*" characters.)
+     */
+    function matchPatternOrExact(patternStrings: ReadonlyArray<string>, candidate: string): string | Pattern | undefined;
+}
+declare namespace ts {
+    function createNode(kind: SyntaxKind, pos?: number, end?: number): Node;
+    function isJSDocLikeText(text: string, start: number): boolean;
+    /**
+     * Invokes a callback for each child of the given node. The 'cbNode' callback is invoked for all child nodes
+     * stored in properties. If a 'cbNodes' callback is specified, it is invoked for embedded arrays; otherwise,
+     * embedded arrays are flattened and the 'cbNode' callback is invoked for each element. If a callback returns
+     * a truthy value, iteration stops and that value is returned. Otherwise, undefined is returned.
+     *
+     * @param node a given node to visit its children
+     * @param cbNode a callback to be invoked for all child nodes
+     * @param cbNodes a callback to be invoked for embedded array
+     *
+     * @remarks `forEachChild` must visit the children of a node in the order
+     * that they appear in the source code. The language service depends on this property to locate nodes by position.
+     */
+    function forEachChild<T>(node: Node, cbNode: (node: Node) => T | undefined, cbNodes?: (nodes: NodeArray<Node>) => T | undefined): T | undefined;
+    function createSourceFile(fileName: string, sourceText: string, languageVersion: ScriptTarget, setParentNodes?: boolean, scriptKind?: ScriptKind): SourceFile;
+    function parseIsolatedEntityName(text: string, languageVersion: ScriptTarget): EntityName | undefined;
+    /**
+     * Parse json text into SyntaxTree and return node and parse errors if any
+     * @param fileName
+     * @param sourceText
+     */
+    function parseJsonText(fileName: string, sourceText: string): JsonSourceFile;
+    function isExternalModule(file: SourceFile): boolean;
+    function updateSourceFile(sourceFile: SourceFile, newText: string, textChangeRange: TextChangeRange, aggressiveChecks?: boolean): SourceFile;
+    function parseIsolatedJSDocComment(content: string, start?: number, length?: number): {
+        jsDoc: JSDoc;
+        diagnostics: Diagnostic[];
+    } | undefined;
+    function parseJSDocTypeExpressionForTests(content: string, start?: number, length?: number): {
+        jsDocTypeExpression: JSDocTypeExpression;
+        diagnostics: Diagnostic[];
+    } | undefined;
+    interface PragmaContext {
+        languageVersion: ScriptTarget;
+        pragmas?: PragmaMap;
+        checkJsDirective?: CheckJsDirective;
+        referencedFiles: FileReference[];
+        typeReferenceDirectives: FileReference[];
+        libReferenceDirectives: FileReference[];
+        amdDependencies: AmdDependency[];
+        hasNoDefaultLib?: boolean;
+        moduleName?: string;
+    }
+    function processCommentPragmas(context: PragmaContext, sourceText: string): void;
+    type PragmaDiagnosticReporter = (pos: number, length: number, message: DiagnosticMessage) => void;
+    function processPragmasIntoFields(context: PragmaContext, reportDiagnostic: PragmaDiagnosticReporter): void;
+    /** @internal */
+    function tagNamesAreEquivalent(lhs: JsxTagNameExpression, rhs: JsxTagNameExpression): boolean;
+}
+declare namespace ts {
+    const compileOnSaveCommandLineOption: CommandLineOption;
+    /**
+     * An array of supported "lib" reference file names used to determine the order for inclusion
+     * when referenced, as well as for spelling suggestions. This ensures the correct ordering for
+     * overload resolution when a type declared in one lib is extended by another.
+     */
+    const libs: string[];
+    /**
+     * A map of lib names to lib files. This map is used both for parsing the "lib" command line
+     * option as well as for resolving lib reference directives.
+     */
+    const libMap: Map<string>;
+    const optionDeclarations: CommandLineOption[];
+    const typeAcquisitionDeclarations: CommandLineOption[];
+    interface OptionNameMap {
+        optionNameMap: Map<CommandLineOption>;
+        shortOptionNames: Map<string>;
+    }
+    const defaultInitCompilerOptions: CompilerOptions;
+    function convertEnableAutoDiscoveryToEnable(typeAcquisition: TypeAcquisition): TypeAcquisition;
+    function createCompilerDiagnosticForInvalidCustomType(opt: CommandLineOptionOfCustomType): Diagnostic;
+    function parseCustomTypeOption(opt: CommandLineOptionOfCustomType, value: string, errors: Push<Diagnostic>): string | number | undefined;
+    function parseListTypeOption(opt: CommandLineOptionOfListType, value: string | undefined, errors: Push<Diagnostic>): (string | number)[] | undefined;
+    function parseCommandLine(commandLine: ReadonlyArray<string>, readFile?: (path: string) => string | undefined): ParsedCommandLine;
+    /** @internal */
+    function getOptionFromName(optionName: string, allowShort?: boolean): CommandLineOption | undefined;
+    function printVersion(): void;
+    function printHelp(optionsList: CommandLineOption[], syntaxPrefix?: string): void;
+    type DiagnosticReporter = (diagnostic: Diagnostic) => void;
+    /**
+     * Reports config file diagnostics
+     */
+    interface ConfigFileDiagnosticsReporter {
+        /**
+         * Reports unrecoverable error when parsing config file
+         */
+        onUnRecoverableConfigFileDiagnostic: DiagnosticReporter;
+    }
+    /**
+     * Interface extending ParseConfigHost to support ParseConfigFile that reads config file and reports errors
+     */
+    interface ParseConfigFileHost extends ParseConfigHost, ConfigFileDiagnosticsReporter {
+        getCurrentDirectory(): string;
+    }
+    /**
+     * Reads the config file, reports errors if any and exits if the config file cannot be found
+     */
+    function getParsedCommandLineOfConfigFile(configFileName: string, optionsToExtend: CompilerOptions, host: ParseConfigFileHost): ParsedCommandLine | undefined;
+    /**
+     * Read tsconfig.json file
+     * @param fileName The path to the config file
+     */
+    function readConfigFile(fileName: string, readFile: (path: string) => string | undefined): {
+        config?: any;
+        error?: Diagnostic;
+    };
+    /**
+     * Parse the text of the tsconfig.json file
+     * @param fileName The path to the config file
+     * @param jsonText The text of the config file
+     */
+    function parseConfigFileTextToJson(fileName: string, jsonText: string): {
+        config?: any;
+        error?: Diagnostic;
+    };
+    /**
+     * Read tsconfig.json file
+     * @param fileName The path to the config file
+     */
+    function readJsonConfigFile(fileName: string, readFile: (path: string) => string | undefined): TsConfigSourceFile;
+    interface JsonConversionNotifier {
+        /**
+         * Notifies parent option object is being set with the optionKey and a valid optionValue
+         * Currently it notifies only if there is element with type object (parentOption) and
+         * has element's option declarations map associated with it
+         * @param parentOption parent option name in which the option and value are being set
+         * @param option option declaration which is being set with the value
+         * @param value value of the option
+         */
+        onSetValidOptionKeyValueInParent(parentOption: string, option: CommandLineOption, value: CompilerOptionsValue): void;
+        /**
+         * Notify when valid root key value option is being set
+         * @param key option key
+         * @param keyNode node corresponding to node in the source file
+         * @param value computed value of the key
+         * @param ValueNode node corresponding to value in the source file
+         */
+        onSetValidOptionKeyValueInRoot(key: string, keyNode: PropertyName, value: CompilerOptionsValue, valueNode: Expression): void;
+        /**
+         * Notify when unknown root key value option is being set
+         * @param key option key
+         * @param keyNode node corresponding to node in the source file
+         * @param value computed value of the key
+         * @param ValueNode node corresponding to value in the source file
+         */
+        onSetUnknownOptionKeyValueInRoot(key: string, keyNode: PropertyName, value: CompilerOptionsValue, valueNode: Expression): void;
+    }
+    /**
+     * Convert the json syntax tree into the json value
+     */
+    function convertToObject(sourceFile: JsonSourceFile, errors: Push<Diagnostic>): any;
+    /**
+     * Convert the json syntax tree into the json value and report errors
+     * This returns the json value (apart from checking errors) only if returnValue provided is true.
+     * Otherwise it just checks the errors and returns undefined
+     */
+    function convertToObjectWorker(sourceFile: JsonSourceFile, errors: Push<Diagnostic>, returnValue: boolean, knownRootOptions: CommandLineOption | undefined, jsonConversionNotifier: JsonConversionNotifier | undefined): any;
+    /**
+     * Generate tsconfig configuration when running command line "--init"
+     * @param options commandlineOptions to be generated into tsconfig.json
+     * @param fileNames array of filenames to be generated into tsconfig.json
+     */
+    function generateTSConfig(options: CompilerOptions, fileNames: ReadonlyArray<string>, newLine: string): string;
+    /**
+     * Parse the contents of a config file (tsconfig.json).
+     * @param json The contents of the config file to parse
+     * @param host Instance of ParseConfigHost used to enumerate files in folder.
+     * @param basePath A root directory to resolve relative path entries in the config
+     *    file to. e.g. outDir
+     */
+    function parseJsonConfigFileContent(json: any, host: ParseConfigHost, basePath: string, existingOptions?: CompilerOptions, configFileName?: string, resolutionStack?: Path[], extraFileExtensions?: ReadonlyArray<FileExtensionInfo>): ParsedCommandLine;
+    /**
+     * Parse the contents of a config file (tsconfig.json).
+     * @param jsonNode The contents of the config file to parse
+     * @param host Instance of ParseConfigHost used to enumerate files in folder.
+     * @param basePath A root directory to resolve relative path entries in the config
+     *    file to. e.g. outDir
+     */
+    function parseJsonSourceFileConfigFileContent(sourceFile: TsConfigSourceFile, host: ParseConfigHost, basePath: string, existingOptions?: CompilerOptions, configFileName?: string, resolutionStack?: Path[], extraFileExtensions?: ReadonlyArray<FileExtensionInfo>): ParsedCommandLine;
+    function setConfigFileInOptions(options: CompilerOptions, configFile: TsConfigSourceFile | undefined): void;
+    function isErrorNoInputFiles(error: Diagnostic): boolean;
+    function getErrorForNoInputFiles({ includeSpecs, excludeSpecs }: ConfigFileSpecs, configFileName: string | undefined): Diagnostic;
+    function convertCompilerOptionsFromJson(jsonOptions: any, basePath: string, configFileName?: string): {
+        options: CompilerOptions;
+        errors: Diagnostic[];
+    };
+    function convertTypeAcquisitionFromJson(jsonOptions: any, basePath: string, configFileName?: string): {
+        options: TypeAcquisition;
+        errors: Diagnostic[];
+    };
+    /**
+     * Gets the file names from the provided config file specs that contain, files, include, exclude and
+     * other properties needed to resolve the file names
+     * @param spec The config file specs extracted with file names to include, wildcards to include/exclude and other details
+     * @param basePath The base path for any relative file specifications.
+     * @param options Compiler options.
+     * @param host The host used to resolve files and directories.
+     * @param extraFileExtensions optionaly file extra file extension information from host
+     */
+    function getFileNamesFromConfigSpecs(spec: ConfigFileSpecs, basePath: string, options: CompilerOptions, host: ParseConfigHost, extraFileExtensions?: ReadonlyArray<FileExtensionInfo>): ExpandResult;
+    /**
+     * Produces a cleaned version of compiler options with personally identifiying info (aka, paths) removed.
+     * Also converts enum values back to strings.
+     */
+    function convertCompilerOptionsForTelemetry(opts: CompilerOptions): CompilerOptions;
+}
+declare namespace ts {
+    function trace(host: ModuleResolutionHost, message: DiagnosticMessage, ...args: any[]): void;
+    function isTraceEnabled(compilerOptions: CompilerOptions, host: ModuleResolutionHost): boolean;
+    /** Array that is only intended to be pushed to, never read. */
+    interface Push<T> {
+        push(value: T): void;
+    }
+    function readJson(path: string, host: {
+        readFile(fileName: string): string | undefined;
+    }): object;
+    function getEffectiveTypeRoots(options: CompilerOptions, host: GetEffectiveTypeRootsHost): string[] | undefined;
+    /**
+     * @param {string | undefined} containingFile - file that contains type reference directive, can be undefined if containing file is unknown.
+     * This is possible in case if resolution is performed for directives specified via 'types' parameter. In this case initial path for secondary lookups
+     * is assumed to be the same as root directory of the project.
+     */
+    function resolveTypeReferenceDirective(typeReferenceDirectiveName: string, containingFile: string | undefined, options: CompilerOptions, host: ModuleResolutionHost): ResolvedTypeReferenceDirectiveWithFailedLookupLocations;
+    /**
+     * Given a set of options, returns the set of type directive names
+     *   that should be included for this program automatically.
+     * This list could either come from the config file,
+     *   or from enumerating the types root + initial secondary types lookup location.
+     * More type directives might appear in the program later as a result of loading actual source files;
+     *   this list is only the set of defaults that are implicitly included.
+     */
+    function getAutomaticTypeDirectiveNames(options: CompilerOptions, host: ModuleResolutionHost): string[];
+    /**
+     * Cached module resolutions per containing directory.
+     * This assumes that any module id will have the same resolution for sibling files located in the same folder.
+     */
+    interface ModuleResolutionCache extends NonRelativeModuleNameResolutionCache {
+        getOrCreateCacheForDirectory(directoryName: string): Map<ResolvedModuleWithFailedLookupLocations>;
+    }
+    /**
+     * Stored map from non-relative module name to a table: directory -> result of module lookup in this directory
+     * We support only non-relative module names because resolution of relative module names is usually more deterministic and thus less expensive.
+     */
+    interface NonRelativeModuleNameResolutionCache {
+        getOrCreateCacheForModuleName(nonRelativeModuleName: string): PerModuleNameCache;
+    }
+    interface PerModuleNameCache {
+        get(directory: string): ResolvedModuleWithFailedLookupLocations | undefined;
+        set(directory: string, result: ResolvedModuleWithFailedLookupLocations): void;
+    }
+    function createModuleResolutionCache(currentDirectory: string, getCanonicalFileName: (s: string) => string): ModuleResolutionCache;
+    function createModuleResolutionCacheWithMaps(directoryToModuleNameMap: Map<Map<ResolvedModuleWithFailedLookupLocations>>, moduleNameToDirectoryMap: Map<PerModuleNameCache>, currentDirectory: string, getCanonicalFileName: GetCanonicalFileName): ModuleResolutionCache;
+    function resolveModuleNameFromCache(moduleName: string, containingFile: string, cache: ModuleResolutionCache): ResolvedModuleWithFailedLookupLocations | undefined;
+    function resolveModuleName(moduleName: string, containingFile: string, compilerOptions: CompilerOptions, host: ModuleResolutionHost, cache?: ModuleResolutionCache): ResolvedModuleWithFailedLookupLocations;
+    function nodeModuleNameResolver(moduleName: string, containingFile: string, compilerOptions: CompilerOptions, host: ModuleResolutionHost, cache?: ModuleResolutionCache): ResolvedModuleWithFailedLookupLocations;
+    /**
+     * Expose resolution logic to allow us to use Node module resolution logic from arbitrary locations.
+     * No way to do this with `require()`: https://github.com/nodejs/node/issues/5963
+     * Throws an error if the module can't be resolved.
+     */
+    function resolveJavaScriptModule(moduleName: string, initialDir: string, host: ModuleResolutionHost): string;
+    function directoryProbablyExists(directoryName: string, host: {
+        directoryExists?: (directoryName: string) => boolean;
+    }): boolean;
+    function getPackageName(moduleName: string): {
+        packageName: string;
+        rest: string;
+    };
+    function getTypesPackageName(packageName: string): string;
+    function getMangledNameForScopedPackage(packageName: string): string;
+    function getPackageNameFromAtTypesDirectory(mangledName: string): string;
+    function getUnmangledNameForScopedPackage(typesPackageName: string): string;
+    function classicNameResolver(moduleName: string, containingFile: string, compilerOptions: CompilerOptions, host: ModuleResolutionHost, cache?: NonRelativeModuleNameResolutionCache): ResolvedModuleWithFailedLookupLocations;
+    /**
+     * LSHost may load a module from a global cache of typings.
+     * This is the minumum code needed to expose that functionality; the rest is in LSHost.
+     */
+    function loadModuleFromGlobalCache(moduleName: string, projectName: string | undefined, compilerOptions: CompilerOptions, host: ModuleResolutionHost, globalCache: string): ResolvedModuleWithFailedLookupLocations;
+}
+//# sourceMappingURL=parser.d.ts.map
+declare namespace ts {
+    enum ModuleInstanceState {
+        NonInstantiated = 0,
+        Instantiated = 1,
+        ConstEnumOnly = 2
+    }
+    function getModuleInstanceState(node: ModuleDeclaration): ModuleInstanceState;
+    function bindSourceFile(file: SourceFile, options: CompilerOptions): void;
+    function isExportsOrModuleExportsOrAlias(sourceFile: SourceFile, node: Expression): boolean;
+    /**
+     * Computes the transform flags for a node, given the transform flags of its subtree
+     *
+     * @param node The node to analyze
+     * @param subtreeFlags Transform flags computed for this node's subtree
+     */
+    function computeTransformFlagsForNode(node: Node, subtreeFlags: TransformFlags): TransformFlags;
+    /**
+     * Gets the transform flags to exclude when unioning the transform flags of a subtree.
+     *
+     * NOTE: This needs to be kept up-to-date with the exclusions used in `computeTransformFlagsForNode`.
+     *       For performance reasons, `computeTransformFlagsForNode` uses local constant values rather
+     *       than calling this function.
+     */
+    function getTransformFlagsSubtreeExclusions(kind: SyntaxKind): TransformFlags.OuterExpressionExcludes | TransformFlags.PropertyAccessExcludes | TransformFlags.NodeExcludes | TransformFlags.ArrowFunctionExcludes | TransformFlags.FunctionExcludes | TransformFlags.ConstructorExcludes | TransformFlags.ClassExcludes | TransformFlags.ModuleExcludes | TransformFlags.TypeExcludes | TransformFlags.ObjectLiteralExcludes | TransformFlags.ArrayLiteralOrCallOrNewExcludes | TransformFlags.VariableDeclarationListExcludes | TransformFlags.CatchClauseExcludes;
+}
+/** @internal */
+declare namespace ts {
+    function createGetSymbolWalker(getRestTypeOfSignature: (sig: Signature) => Type, getTypePredicateOfSignature: (sig: Signature) => TypePredicate | undefined, getReturnTypeOfSignature: (sig: Signature) => Type, getBaseTypes: (type: Type) => Type[], resolveStructuredTypeMembers: (type: ObjectType) => ResolvedType, getTypeOfSymbol: (sym: Symbol) => Type, getResolvedSymbol: (node: Node) => Symbol, getIndexTypeOfStructuredType: (type: Type, kind: IndexKind) => Type | undefined, getConstraintFromTypeParameter: (typeParameter: TypeParameter) => Type | undefined, getFirstIdentifier: (node: EntityNameOrEntityNameExpression) => Identifier): (accept?: (symbol: Symbol) => boolean) => SymbolWalker;
+}
+declare namespace ts {
+    function getNodeId(node: Node): number;
+    function getSymbolId(symbol: Symbol): number;
+    function isInstantiatedModule(node: ModuleDeclaration, preserveConstEnums: boolean): boolean;
+    function createTypeChecker(host: TypeCheckerHost, produceDiagnostics: boolean): TypeChecker;
+}
+declare namespace ts {
+    function updateNode<T extends Node>(updated: T, original: T): T;
+    function createNodeArray<T extends Node>(elements?: T[], hasTrailingComma?: boolean): MutableNodeArray<T>;
+    function createNodeArray<T extends Node>(elements?: ReadonlyArray<T>, hasTrailingComma?: boolean): NodeArray<T>;
+    /**
+     * Creates a shallow, memberwise clone of a node with no source map location.
+     */
+    function getSynthesizedClone<T extends Node>(node: T): T;
+    function createLiteral(value: string | StringLiteral | NoSubstitutionTemplateLiteral | NumericLiteral | Identifier, isSingleQuote: boolean): StringLiteral;
+    /** If a node is passed, creates a string literal whose source text is read from a source node during emit. */
+    function createLiteral(value: string | StringLiteral | NoSubstitutionTemplateLiteral | NumericLiteral | Identifier): StringLiteral;
+    function createLiteral(value: number): NumericLiteral;
+    function createLiteral(value: boolean): BooleanLiteral;
+    function createLiteral(value: string | number | boolean): PrimaryExpression;
+    function createNumericLiteral(value: string): NumericLiteral;
+    function createStringLiteral(text: string): StringLiteral;
+    function createRegularExpressionLiteral(text: string): RegularExpressionLiteral;
+    function createIdentifier(text: string): Identifier;
+    function createIdentifier(text: string, typeArguments: ReadonlyArray<TypeNode | TypeParameterDeclaration> | undefined): Identifier;
+    function updateIdentifier(node: Identifier): Identifier;
+    function updateIdentifier(node: Identifier, typeArguments: NodeArray<TypeNode | TypeParameterDeclaration> | undefined): Identifier;
+    /** Create a unique temporary variable. */
+    function createTempVariable(recordTempVariable: ((node: Identifier) => void) | undefined): Identifier;
+    function createTempVariable(recordTempVariable: ((node: Identifier) => void) | undefined, reservedInNestedScopes: boolean): GeneratedIdentifier;
+    /** Create a unique temporary variable for use in a loop. */
+    function createLoopVariable(): Identifier;
+    /** Create a unique name based on the supplied text. */
+    function createUniqueName(text: string): Identifier;
+    function createOptimisticUniqueName(text: string): GeneratedIdentifier;
+    /** Create a unique name based on the supplied text. */
+    function createOptimisticUniqueName(text: string): Identifier;
+    /** Create a unique name based on the supplied text. This does not consider names injected by the transformer. */
+    function createFileLevelUniqueName(text: string): Identifier;
+    /** Create a unique name generated for a node. */
+    function getGeneratedNameForNode(node: Node): Identifier;
+    function getGeneratedNameForNode(node: Node, flags: GeneratedIdentifierFlags): Identifier;
+    function createToken<TKind extends SyntaxKind>(token: TKind): Token<TKind>;
+    function createSuper(): SuperExpression;
+    function createThis(): ThisExpression & Token<SyntaxKind.ThisKeyword>;
+    function createNull(): NullLiteral & Token<SyntaxKind.NullKeyword>;
+    function createTrue(): BooleanLiteral & Token<SyntaxKind.TrueKeyword>;
+    function createFalse(): BooleanLiteral & Token<SyntaxKind.FalseKeyword>;
+    function createModifier<T extends Modifier["kind"]>(kind: T): Token<T>;
+    function createModifiersFromModifierFlags(flags: ModifierFlags): Modifier[];
+    function createQualifiedName(left: EntityName, right: string | Identifier): QualifiedName;
+    function updateQualifiedName(node: QualifiedName, left: EntityName, right: Identifier): QualifiedName;
+    function createComputedPropertyName(expression: Expression): ComputedPropertyName;
+    function updateComputedPropertyName(node: ComputedPropertyName, expression: Expression): ComputedPropertyName;
+    function createTypeParameterDeclaration(name: string | Identifier, constraint?: TypeNode, defaultType?: TypeNode): TypeParameterDeclaration;
+    function updateTypeParameterDeclaration(node: TypeParameterDeclaration, name: Identifier, constraint: TypeNode | undefined, defaultType: TypeNode | undefined): TypeParameterDeclaration;
+    function createParameter(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, dotDotDotToken: DotDotDotToken | undefined, name: string | BindingName, questionToken?: QuestionToken, type?: TypeNode, initializer?: Expression): ParameterDeclaration;
+    function updateParameter(node: ParameterDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, dotDotDotToken: DotDotDotToken | undefined, name: string | BindingName, questionToken: QuestionToken | undefined, type: TypeNode | undefined, initializer: Expression | undefined): ParameterDeclaration;
+    function createDecorator(expression: Expression): Decorator;
+    function updateDecorator(node: Decorator, expression: Expression): Decorator;
+    function createPropertySignature(modifiers: ReadonlyArray<Modifier> | undefined, name: PropertyName | string, questionToken: QuestionToken | undefined, type: TypeNode | undefined, initializer: Expression | undefined): PropertySignature;
+    function updatePropertySignature(node: PropertySignature, modifiers: ReadonlyArray<Modifier> | undefined, name: PropertyName, questionToken: QuestionToken | undefined, type: TypeNode | undefined, initializer: Expression | undefined): PropertySignature;
+    function createProperty(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | PropertyName, questionOrExclamationToken: QuestionToken | ExclamationToken | undefined, type: TypeNode | undefined, initializer: Expression | undefined): PropertyDeclaration;
+    function updateProperty(node: PropertyDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | PropertyName, questionOrExclamationToken: QuestionToken | ExclamationToken | undefined, type: TypeNode | undefined, initializer: Expression | undefined): PropertyDeclaration;
+    function createMethodSignature(typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, name: string | PropertyName, questionToken: QuestionToken | undefined): MethodSignature;
+    function updateMethodSignature(node: MethodSignature, typeParameters: NodeArray<TypeParameterDeclaration> | undefined, parameters: NodeArray<ParameterDeclaration>, type: TypeNode | undefined, name: PropertyName, questionToken: QuestionToken | undefined): MethodSignature;
+    function createMethod(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, asteriskToken: AsteriskToken | undefined, name: string | PropertyName, questionToken: QuestionToken | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, body: Block | undefined): MethodDeclaration;
+    function updateMethod(node: MethodDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, asteriskToken: AsteriskToken | undefined, name: PropertyName, questionToken: QuestionToken | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, body: Block | undefined): MethodDeclaration;
+    function createConstructor(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, body: Block | undefined): ConstructorDeclaration;
+    function updateConstructor(node: ConstructorDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, body: Block | undefined): ConstructorDeclaration;
+    function createGetAccessor(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | PropertyName, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, body: Block | undefined): GetAccessorDeclaration;
+    function updateGetAccessor(node: GetAccessorDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: PropertyName, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, body: Block | undefined): GetAccessorDeclaration;
+    function createSetAccessor(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | PropertyName, parameters: ReadonlyArray<ParameterDeclaration>, body: Block | undefined): SetAccessorDeclaration;
+    function updateSetAccessor(node: SetAccessorDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: PropertyName, parameters: ReadonlyArray<ParameterDeclaration>, body: Block | undefined): SetAccessorDeclaration;
+    function createCallSignature(typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined): CallSignatureDeclaration;
+    function updateCallSignature(node: CallSignatureDeclaration, typeParameters: NodeArray<TypeParameterDeclaration> | undefined, parameters: NodeArray<ParameterDeclaration>, type: TypeNode | undefined): CallSignatureDeclaration;
+    function createConstructSignature(typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined): ConstructSignatureDeclaration;
+    function updateConstructSignature(node: ConstructSignatureDeclaration, typeParameters: NodeArray<TypeParameterDeclaration> | undefined, parameters: NodeArray<ParameterDeclaration>, type: TypeNode | undefined): ConstructSignatureDeclaration;
+    function createIndexSignature(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode): IndexSignatureDeclaration;
+    function updateIndexSignature(node: IndexSignatureDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode): IndexSignatureDeclaration;
+    function createSignatureDeclaration(kind: SyntaxKind, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, typeArguments?: ReadonlyArray<TypeNode> | undefined): SignatureDeclaration;
+    function createKeywordTypeNode(kind: KeywordTypeNode["kind"]): KeywordTypeNode;
+    function createTypePredicateNode(parameterName: Identifier | ThisTypeNode | string, type: TypeNode): TypePredicateNode;
+    function updateTypePredicateNode(node: TypePredicateNode, parameterName: Identifier | ThisTypeNode, type: TypeNode): TypePredicateNode;
+    function createTypeReferenceNode(typeName: string | EntityName, typeArguments: ReadonlyArray<TypeNode> | undefined): TypeReferenceNode;
+    function updateTypeReferenceNode(node: TypeReferenceNode, typeName: EntityName, typeArguments: NodeArray<TypeNode> | undefined): TypeReferenceNode;
+    function createFunctionTypeNode(typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined): FunctionTypeNode;
+    function updateFunctionTypeNode(node: FunctionTypeNode, typeParameters: NodeArray<TypeParameterDeclaration> | undefined, parameters: NodeArray<ParameterDeclaration>, type: TypeNode | undefined): FunctionTypeNode;
+    function createConstructorTypeNode(typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined): ConstructorTypeNode;
+    function updateConstructorTypeNode(node: ConstructorTypeNode, typeParameters: NodeArray<TypeParameterDeclaration> | undefined, parameters: NodeArray<ParameterDeclaration>, type: TypeNode | undefined): ConstructorTypeNode;
+    function createTypeQueryNode(exprName: EntityName): TypeQueryNode;
+    function updateTypeQueryNode(node: TypeQueryNode, exprName: EntityName): TypeQueryNode;
+    function createTypeLiteralNode(members: ReadonlyArray<TypeElement> | undefined): TypeLiteralNode;
+    function updateTypeLiteralNode(node: TypeLiteralNode, members: NodeArray<TypeElement>): TypeLiteralNode;
+    function createArrayTypeNode(elementType: TypeNode): ArrayTypeNode;
+    function updateArrayTypeNode(node: ArrayTypeNode, elementType: TypeNode): ArrayTypeNode;
+    function createTupleTypeNode(elementTypes: ReadonlyArray<TypeNode>): TupleTypeNode;
+    function updateTypleTypeNode(node: TupleTypeNode, elementTypes: ReadonlyArray<TypeNode>): TupleTypeNode;
+    function createUnionTypeNode(types: ReadonlyArray<TypeNode>): UnionTypeNode;
+    function updateUnionTypeNode(node: UnionTypeNode, types: NodeArray<TypeNode>): UnionTypeNode;
+    function createIntersectionTypeNode(types: ReadonlyArray<TypeNode>): IntersectionTypeNode;
+    function updateIntersectionTypeNode(node: IntersectionTypeNode, types: NodeArray<TypeNode>): IntersectionTypeNode;
+    function createUnionOrIntersectionTypeNode(kind: SyntaxKind.UnionType | SyntaxKind.IntersectionType, types: ReadonlyArray<TypeNode>): UnionTypeNode | IntersectionTypeNode;
+    function createConditionalTypeNode(checkType: TypeNode, extendsType: TypeNode, trueType: TypeNode, falseType: TypeNode): ConditionalTypeNode;
+    function updateConditionalTypeNode(node: ConditionalTypeNode, checkType: TypeNode, extendsType: TypeNode, trueType: TypeNode, falseType: TypeNode): ConditionalTypeNode;
+    function createInferTypeNode(typeParameter: TypeParameterDeclaration): InferTypeNode;
+    function updateInferTypeNode(node: InferTypeNode, typeParameter: TypeParameterDeclaration): InferTypeNode;
+    function createImportTypeNode(argument: TypeNode, qualifier?: EntityName, typeArguments?: ReadonlyArray<TypeNode>, isTypeOf?: boolean): ImportTypeNode;
+    function updateImportTypeNode(node: ImportTypeNode, argument: TypeNode, qualifier?: EntityName, typeArguments?: ReadonlyArray<TypeNode>, isTypeOf?: boolean): ImportTypeNode;
+    function createParenthesizedType(type: TypeNode): ParenthesizedTypeNode;
+    function updateParenthesizedType(node: ParenthesizedTypeNode, type: TypeNode): ParenthesizedTypeNode;
+    function createThisTypeNode(): ThisTypeNode;
+    function createTypeOperatorNode(type: TypeNode): TypeOperatorNode;
+    function createTypeOperatorNode(operator: SyntaxKind.KeyOfKeyword | SyntaxKind.UniqueKeyword, type: TypeNode): TypeOperatorNode;
+    function updateTypeOperatorNode(node: TypeOperatorNode, type: TypeNode): TypeOperatorNode;
+    function createIndexedAccessTypeNode(objectType: TypeNode, indexType: TypeNode): IndexedAccessTypeNode;
+    function updateIndexedAccessTypeNode(node: IndexedAccessTypeNode, objectType: TypeNode, indexType: TypeNode): IndexedAccessTypeNode;
+    function createMappedTypeNode(readonlyToken: ReadonlyToken | PlusToken | MinusToken | undefined, typeParameter: TypeParameterDeclaration, questionToken: QuestionToken | PlusToken | MinusToken | undefined, type: TypeNode | undefined): MappedTypeNode;
+    function updateMappedTypeNode(node: MappedTypeNode, readonlyToken: ReadonlyToken | PlusToken | MinusToken | undefined, typeParameter: TypeParameterDeclaration, questionToken: QuestionToken | PlusToken | MinusToken | undefined, type: TypeNode | undefined): MappedTypeNode;
+    function createLiteralTypeNode(literal: LiteralTypeNode["literal"]): LiteralTypeNode;
+    function updateLiteralTypeNode(node: LiteralTypeNode, literal: LiteralTypeNode["literal"]): LiteralTypeNode;
+    function createObjectBindingPattern(elements: ReadonlyArray<BindingElement>): ObjectBindingPattern;
+    function updateObjectBindingPattern(node: ObjectBindingPattern, elements: ReadonlyArray<BindingElement>): ObjectBindingPattern;
+    function createArrayBindingPattern(elements: ReadonlyArray<ArrayBindingElement>): ArrayBindingPattern;
+    function updateArrayBindingPattern(node: ArrayBindingPattern, elements: ReadonlyArray<ArrayBindingElement>): ArrayBindingPattern;
+    function createBindingElement(dotDotDotToken: DotDotDotToken | undefined, propertyName: string | PropertyName | undefined, name: string | BindingName, initializer?: Expression): BindingElement;
+    function updateBindingElement(node: BindingElement, dotDotDotToken: DotDotDotToken | undefined, propertyName: PropertyName | undefined, name: BindingName, initializer: Expression | undefined): BindingElement;
+    function createArrayLiteral(elements?: ReadonlyArray<Expression>, multiLine?: boolean): ArrayLiteralExpression;
+    function updateArrayLiteral(node: ArrayLiteralExpression, elements: ReadonlyArray<Expression>): ArrayLiteralExpression;
+    function createObjectLiteral(properties?: ReadonlyArray<ObjectLiteralElementLike>, multiLine?: boolean): ObjectLiteralExpression;
+    function updateObjectLiteral(node: ObjectLiteralExpression, properties: ReadonlyArray<ObjectLiteralElementLike>): ObjectLiteralExpression;
+    function createPropertyAccess(expression: Expression, name: string | Identifier | undefined): PropertyAccessExpression;
+    function updatePropertyAccess(node: PropertyAccessExpression, expression: Expression, name: Identifier): PropertyAccessExpression;
+    function createElementAccess(expression: Expression, index: number | Expression): ElementAccessExpression;
+    function updateElementAccess(node: ElementAccessExpression, expression: Expression, argumentExpression: Expression): ElementAccessExpression;
+    function createCall(expression: Expression, typeArguments: ReadonlyArray<TypeNode> | undefined, argumentsArray: ReadonlyArray<Expression> | undefined): CallExpression;
+    function updateCall(node: CallExpression, expression: Expression, typeArguments: ReadonlyArray<TypeNode> | undefined, argumentsArray: ReadonlyArray<Expression>): CallExpression;
+    function createNew(expression: Expression, typeArguments: ReadonlyArray<TypeNode> | undefined, argumentsArray: ReadonlyArray<Expression> | undefined): NewExpression;
+    function updateNew(node: NewExpression, expression: Expression, typeArguments: ReadonlyArray<TypeNode> | undefined, argumentsArray: ReadonlyArray<Expression> | undefined): NewExpression;
+    function createTaggedTemplate(tag: Expression, template: TemplateLiteral): TaggedTemplateExpression;
+    function createTaggedTemplate(tag: Expression, typeArguments: ReadonlyArray<TypeNode> | undefined, template: TemplateLiteral): TaggedTemplateExpression;
+    /** @internal */
+    function createTaggedTemplate(tag: Expression, typeArgumentsOrTemplate: ReadonlyArray<TypeNode> | TemplateLiteral | undefined, template?: TemplateLiteral): TaggedTemplateExpression;
+    function updateTaggedTemplate(node: TaggedTemplateExpression, tag: Expression, template: TemplateLiteral): TaggedTemplateExpression;
+    function updateTaggedTemplate(node: TaggedTemplateExpression, tag: Expression, typeArguments: ReadonlyArray<TypeNode> | undefined, template: TemplateLiteral): TaggedTemplateExpression;
+    function createTypeAssertion(type: TypeNode, expression: Expression): TypeAssertion;
+    function updateTypeAssertion(node: TypeAssertion, type: TypeNode, expression: Expression): TypeAssertion;
+    function createParen(expression: Expression): ParenthesizedExpression;
+    function updateParen(node: ParenthesizedExpression, expression: Expression): ParenthesizedExpression;
+    function createFunctionExpression(modifiers: ReadonlyArray<Modifier> | undefined, asteriskToken: AsteriskToken | undefined, name: string | Identifier | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration> | undefined, type: TypeNode | undefined, body: Block): FunctionExpression;
+    function updateFunctionExpression(node: FunctionExpression, modifiers: ReadonlyArray<Modifier> | undefined, asteriskToken: AsteriskToken | undefined, name: Identifier | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, body: Block): FunctionExpression;
+    function createArrowFunction(modifiers: ReadonlyArray<Modifier> | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, equalsGreaterThanToken: EqualsGreaterThanToken | undefined, body: ConciseBody): ArrowFunction;
+    function updateArrowFunction(node: ArrowFunction, modifiers: ReadonlyArray<Modifier> | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, body: ConciseBody): ArrowFunction;
+    function updateArrowFunction(node: ArrowFunction, modifiers: ReadonlyArray<Modifier> | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, equalsGreaterThanToken: Token<SyntaxKind.EqualsGreaterThanToken>, body: ConciseBody): ArrowFunction;
+    function createDelete(expression: Expression): DeleteExpression;
+    function updateDelete(node: DeleteExpression, expression: Expression): DeleteExpression;
+    function createTypeOf(expression: Expression): TypeOfExpression;
+    function updateTypeOf(node: TypeOfExpression, expression: Expression): TypeOfExpression;
+    function createVoid(expression: Expression): VoidExpression;
+    function updateVoid(node: VoidExpression, expression: Expression): VoidExpression;
+    function createAwait(expression: Expression): AwaitExpression;
+    function updateAwait(node: AwaitExpression, expression: Expression): AwaitExpression;
+    function createPrefix(operator: PrefixUnaryOperator, operand: Expression): PrefixUnaryExpression;
+    function updatePrefix(node: PrefixUnaryExpression, operand: Expression): PrefixUnaryExpression;
+    function createPostfix(operand: Expression, operator: PostfixUnaryOperator): PostfixUnaryExpression;
+    function updatePostfix(node: PostfixUnaryExpression, operand: Expression): PostfixUnaryExpression;
+    function createBinary(left: Expression, operator: BinaryOperator | BinaryOperatorToken, right: Expression): BinaryExpression;
+    function updateBinary(node: BinaryExpression, left: Expression, right: Expression, operator?: BinaryOperator | BinaryOperatorToken): BinaryExpression;
+    function createConditional(condition: Expression, whenTrue: Expression, whenFalse: Expression): ConditionalExpression;
+    function createConditional(condition: Expression, questionToken: QuestionToken, whenTrue: Expression, colonToken: ColonToken, whenFalse: Expression): ConditionalExpression;
+    function updateConditional(node: ConditionalExpression, condition: Expression, whenTrue: Expression, whenFalse: Expression): ConditionalExpression;
+    function updateConditional(node: ConditionalExpression, condition: Expression, questionToken: Token<SyntaxKind.QuestionToken>, whenTrue: Expression, colonToken: Token<SyntaxKind.ColonToken>, whenFalse: Expression): ConditionalExpression;
+    function createTemplateExpression(head: TemplateHead, templateSpans: ReadonlyArray<TemplateSpan>): TemplateExpression;
+    function updateTemplateExpression(node: TemplateExpression, head: TemplateHead, templateSpans: ReadonlyArray<TemplateSpan>): TemplateExpression;
+    function createTemplateHead(text: string): TemplateHead;
+    function createTemplateMiddle(text: string): TemplateMiddle;
+    function createTemplateTail(text: string): TemplateTail;
+    function createNoSubstitutionTemplateLiteral(text: string): NoSubstitutionTemplateLiteral;
+    function createYield(expression?: Expression): YieldExpression;
+    function createYield(asteriskToken: AsteriskToken | undefined, expression: Expression): YieldExpression;
+    function updateYield(node: YieldExpression, asteriskToken: AsteriskToken | undefined, expression: Expression): YieldExpression;
+    function createSpread(expression: Expression): SpreadElement;
+    function updateSpread(node: SpreadElement, expression: Expression): SpreadElement;
+    function createClassExpression(modifiers: ReadonlyArray<Modifier> | undefined, name: string | Identifier | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, heritageClauses: ReadonlyArray<HeritageClause> | undefined, members: ReadonlyArray<ClassElement>): ClassExpression;
+    function updateClassExpression(node: ClassExpression, modifiers: ReadonlyArray<Modifier> | undefined, name: Identifier | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, heritageClauses: ReadonlyArray<HeritageClause> | undefined, members: ReadonlyArray<ClassElement>): ClassExpression;
+    function createOmittedExpression(): OmittedExpression;
+    function createExpressionWithTypeArguments(typeArguments: ReadonlyArray<TypeNode> | undefined, expression: Expression): ExpressionWithTypeArguments;
+    function updateExpressionWithTypeArguments(node: ExpressionWithTypeArguments, typeArguments: ReadonlyArray<TypeNode> | undefined, expression: Expression): ExpressionWithTypeArguments;
+    function createAsExpression(expression: Expression, type: TypeNode): AsExpression;
+    function updateAsExpression(node: AsExpression, expression: Expression, type: TypeNode): AsExpression;
+    function createNonNullExpression(expression: Expression): NonNullExpression;
+    function updateNonNullExpression(node: NonNullExpression, expression: Expression): NonNullExpression;
+    function createMetaProperty(keywordToken: MetaProperty["keywordToken"], name: Identifier): MetaProperty;
+    function updateMetaProperty(node: MetaProperty, name: Identifier): MetaProperty;
+    function createTemplateSpan(expression: Expression, literal: TemplateMiddle | TemplateTail): TemplateSpan;
+    function updateTemplateSpan(node: TemplateSpan, expression: Expression, literal: TemplateMiddle | TemplateTail): TemplateSpan;
+    function createSemicolonClassElement(): SemicolonClassElement;
+    function createBlock(statements: ReadonlyArray<Statement>, multiLine?: boolean): Block;
+    function createExpressionStatement(expression: Expression): ExpressionStatement;
+    function updateBlock(node: Block, statements: ReadonlyArray<Statement>): Block;
+    function createVariableStatement(modifiers: ReadonlyArray<Modifier> | undefined, declarationList: VariableDeclarationList | ReadonlyArray<VariableDeclaration>): VariableStatement;
+    function updateVariableStatement(node: VariableStatement, modifiers: ReadonlyArray<Modifier> | undefined, declarationList: VariableDeclarationList): VariableStatement;
+    function createEmptyStatement(): EmptyStatement;
+    function createStatement(expression: Expression): ExpressionStatement;
+    function updateStatement(node: ExpressionStatement, expression: Expression): ExpressionStatement;
+    function createIf(expression: Expression, thenStatement: Statement, elseStatement?: Statement): IfStatement;
+    function updateIf(node: IfStatement, expression: Expression, thenStatement: Statement, elseStatement: Statement | undefined): IfStatement;
+    function createDo(statement: Statement, expression: Expression): DoStatement;
+    function updateDo(node: DoStatement, statement: Statement, expression: Expression): DoStatement;
+    function createWhile(expression: Expression, statement: Statement): WhileStatement;
+    function updateWhile(node: WhileStatement, expression: Expression, statement: Statement): WhileStatement;
+    function createFor(initializer: ForInitializer | undefined, condition: Expression | undefined, incrementor: Expression | undefined, statement: Statement): ForStatement;
+    function updateFor(node: ForStatement, initializer: ForInitializer | undefined, condition: Expression | undefined, incrementor: Expression | undefined, statement: Statement): ForStatement;
+    function createForIn(initializer: ForInitializer, expression: Expression, statement: Statement): ForInStatement;
+    function updateForIn(node: ForInStatement, initializer: ForInitializer, expression: Expression, statement: Statement): ForInStatement;
+    function createForOf(awaitModifier: AwaitKeywordToken | undefined, initializer: ForInitializer, expression: Expression, statement: Statement): ForOfStatement;
+    function updateForOf(node: ForOfStatement, awaitModifier: AwaitKeywordToken | undefined, initializer: ForInitializer, expression: Expression, statement: Statement): ForOfStatement;
+    function createContinue(label?: string | Identifier): ContinueStatement;
+    function updateContinue(node: ContinueStatement, label: Identifier | undefined): ContinueStatement;
+    function createBreak(label?: string | Identifier): BreakStatement;
+    function updateBreak(node: BreakStatement, label: Identifier | undefined): BreakStatement;
+    function createReturn(expression?: Expression): ReturnStatement;
+    function updateReturn(node: ReturnStatement, expression: Expression | undefined): ReturnStatement;
+    function createWith(expression: Expression, statement: Statement): WithStatement;
+    function updateWith(node: WithStatement, expression: Expression, statement: Statement): WithStatement;
+    function createSwitch(expression: Expression, caseBlock: CaseBlock): SwitchStatement;
+    function updateSwitch(node: SwitchStatement, expression: Expression, caseBlock: CaseBlock): SwitchStatement;
+    function createLabel(label: string | Identifier, statement: Statement): LabeledStatement;
+    function updateLabel(node: LabeledStatement, label: Identifier, statement: Statement): LabeledStatement;
+    function createThrow(expression: Expression): ThrowStatement;
+    function updateThrow(node: ThrowStatement, expression: Expression): ThrowStatement;
+    function createTry(tryBlock: Block, catchClause: CatchClause | undefined, finallyBlock: Block | undefined): TryStatement;
+    function updateTry(node: TryStatement, tryBlock: Block, catchClause: CatchClause | undefined, finallyBlock: Block | undefined): TryStatement;
+    function createDebuggerStatement(): DebuggerStatement;
+    function createVariableDeclaration(name: string | BindingName, type?: TypeNode, initializer?: Expression): VariableDeclaration;
+    function updateVariableDeclaration(node: VariableDeclaration, name: BindingName, type: TypeNode | undefined, initializer: Expression | undefined): VariableDeclaration;
+    function createVariableDeclarationList(declarations: ReadonlyArray<VariableDeclaration>, flags?: NodeFlags): VariableDeclarationList;
+    function updateVariableDeclarationList(node: VariableDeclarationList, declarations: ReadonlyArray<VariableDeclaration>): VariableDeclarationList;
+    function createFunctionDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, asteriskToken: AsteriskToken | undefined, name: string | Identifier | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, body: Block | undefined): FunctionDeclaration;
+    function updateFunctionDeclaration(node: FunctionDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, asteriskToken: AsteriskToken | undefined, name: Identifier | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, body: Block | undefined): FunctionDeclaration;
+    function createClassDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | Identifier | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, heritageClauses: ReadonlyArray<HeritageClause> | undefined, members: ReadonlyArray<ClassElement>): ClassDeclaration;
+    function updateClassDeclaration(node: ClassDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: Identifier | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, heritageClauses: ReadonlyArray<HeritageClause> | undefined, members: ReadonlyArray<ClassElement>): ClassDeclaration;
+    function createInterfaceDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | Identifier, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, heritageClauses: ReadonlyArray<HeritageClause> | undefined, members: ReadonlyArray<TypeElement>): InterfaceDeclaration;
+    function updateInterfaceDeclaration(node: InterfaceDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: Identifier, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, heritageClauses: ReadonlyArray<HeritageClause> | undefined, members: ReadonlyArray<TypeElement>): InterfaceDeclaration;
+    function createTypeAliasDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | Identifier, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, type: TypeNode): TypeAliasDeclaration;
+    function updateTypeAliasDeclaration(node: TypeAliasDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: Identifier, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, type: TypeNode): TypeAliasDeclaration;
+    function createEnumDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | Identifier, members: ReadonlyArray<EnumMember>): EnumDeclaration;
+    function updateEnumDeclaration(node: EnumDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: Identifier, members: ReadonlyArray<EnumMember>): EnumDeclaration;
+    function createModuleDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: ModuleName, body: ModuleBody | undefined, flags?: NodeFlags): ModuleDeclaration;
+    function updateModuleDeclaration(node: ModuleDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: ModuleName, body: ModuleBody | undefined): ModuleDeclaration;
+    function createModuleBlock(statements: ReadonlyArray<Statement>): ModuleBlock;
+    function updateModuleBlock(node: ModuleBlock, statements: ReadonlyArray<Statement>): ModuleBlock;
+    function createCaseBlock(clauses: ReadonlyArray<CaseOrDefaultClause>): CaseBlock;
+    function updateCaseBlock(node: CaseBlock, clauses: ReadonlyArray<CaseOrDefaultClause>): CaseBlock;
+    function createNamespaceExportDeclaration(name: string | Identifier): NamespaceExportDeclaration;
+    function updateNamespaceExportDeclaration(node: NamespaceExportDeclaration, name: Identifier): NamespaceExportDeclaration;
+    function createImportEqualsDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | Identifier, moduleReference: ModuleReference): ImportEqualsDeclaration;
+    function updateImportEqualsDeclaration(node: ImportEqualsDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: Identifier, moduleReference: ModuleReference): ImportEqualsDeclaration;
+    function createImportDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, importClause: ImportClause | undefined, moduleSpecifier: Expression): ImportDeclaration;
+    function updateImportDeclaration(node: ImportDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, importClause: ImportClause | undefined, moduleSpecifier: Expression): ImportDeclaration;
+    function createImportClause(name: Identifier | undefined, namedBindings: NamedImportBindings | undefined): ImportClause;
+    function updateImportClause(node: ImportClause, name: Identifier | undefined, namedBindings: NamedImportBindings | undefined): ImportClause;
+    function createNamespaceImport(name: Identifier): NamespaceImport;
+    function updateNamespaceImport(node: NamespaceImport, name: Identifier): NamespaceImport;
+    function createNamedImports(elements: ReadonlyArray<ImportSpecifier>): NamedImports;
+    function updateNamedImports(node: NamedImports, elements: ReadonlyArray<ImportSpecifier>): NamedImports;
+    function createImportSpecifier(propertyName: Identifier | undefined, name: Identifier): ImportSpecifier;
+    function updateImportSpecifier(node: ImportSpecifier, propertyName: Identifier | undefined, name: Identifier): ImportSpecifier;
+    function createExportAssignment(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, isExportEquals: boolean | undefined, expression: Expression): ExportAssignment;
+    function updateExportAssignment(node: ExportAssignment, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, expression: Expression): ExportAssignment;
+    function createExportDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, exportClause: NamedExports | undefined, moduleSpecifier?: Expression): ExportDeclaration;
+    function updateExportDeclaration(node: ExportDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, exportClause: NamedExports | undefined, moduleSpecifier: Expression | undefined): ExportDeclaration;
+    function createNamedExports(elements: ReadonlyArray<ExportSpecifier>): NamedExports;
+    function updateNamedExports(node: NamedExports, elements: ReadonlyArray<ExportSpecifier>): NamedExports;
+    function createExportSpecifier(propertyName: string | Identifier | undefined, name: string | Identifier): ExportSpecifier;
+    function updateExportSpecifier(node: ExportSpecifier, propertyName: Identifier | undefined, name: Identifier): ExportSpecifier;
+    function createExternalModuleReference(expression: Expression): ExternalModuleReference;
+    function updateExternalModuleReference(node: ExternalModuleReference, expression: Expression): ExternalModuleReference;
+    function createJsxElement(openingElement: JsxOpeningElement, children: ReadonlyArray<JsxChild>, closingElement: JsxClosingElement): JsxElement;
+    function updateJsxElement(node: JsxElement, openingElement: JsxOpeningElement, children: ReadonlyArray<JsxChild>, closingElement: JsxClosingElement): JsxElement;
+    function createJsxSelfClosingElement(tagName: JsxTagNameExpression, typeArguments: ReadonlyArray<TypeNode> | undefined, attributes: JsxAttributes): JsxSelfClosingElement;
+    function updateJsxSelfClosingElement(node: JsxSelfClosingElement, tagName: JsxTagNameExpression, typeArguments: ReadonlyArray<TypeNode> | undefined, attributes: JsxAttributes): JsxSelfClosingElement;
+    function createJsxOpeningElement(tagName: JsxTagNameExpression, typeArguments: ReadonlyArray<TypeNode> | undefined, attributes: JsxAttributes): JsxOpeningElement;
+    function updateJsxOpeningElement(node: JsxOpeningElement, tagName: JsxTagNameExpression, typeArguments: ReadonlyArray<TypeNode> | undefined, attributes: JsxAttributes): JsxOpeningElement;
+    function createJsxClosingElement(tagName: JsxTagNameExpression): JsxClosingElement;
+    function updateJsxClosingElement(node: JsxClosingElement, tagName: JsxTagNameExpression): JsxClosingElement;
+    function createJsxFragment(openingFragment: JsxOpeningFragment, children: ReadonlyArray<JsxChild>, closingFragment: JsxClosingFragment): JsxFragment;
+    function updateJsxFragment(node: JsxFragment, openingFragment: JsxOpeningFragment, children: ReadonlyArray<JsxChild>, closingFragment: JsxClosingFragment): JsxFragment;
+    function createJsxAttribute(name: Identifier, initializer: StringLiteral | JsxExpression): JsxAttribute;
+    function updateJsxAttribute(node: JsxAttribute, name: Identifier, initializer: StringLiteral | JsxExpression): JsxAttribute;
+    function createJsxAttributes(properties: ReadonlyArray<JsxAttributeLike>): JsxAttributes;
+    function updateJsxAttributes(node: JsxAttributes, properties: ReadonlyArray<JsxAttributeLike>): JsxAttributes;
+    function createJsxSpreadAttribute(expression: Expression): JsxSpreadAttribute;
+    function updateJsxSpreadAttribute(node: JsxSpreadAttribute, expression: Expression): JsxSpreadAttribute;
+    function createJsxExpression(dotDotDotToken: DotDotDotToken | undefined, expression: Expression | undefined): JsxExpression;
+    function updateJsxExpression(node: JsxExpression, expression: Expression | undefined): JsxExpression;
+    function createCaseClause(expression: Expression, statements: ReadonlyArray<Statement>): CaseClause;
+    function updateCaseClause(node: CaseClause, expression: Expression, statements: ReadonlyArray<Statement>): CaseClause;
+    function createDefaultClause(statements: ReadonlyArray<Statement>): DefaultClause;
+    function updateDefaultClause(node: DefaultClause, statements: ReadonlyArray<Statement>): DefaultClause;
+    function createHeritageClause(token: HeritageClause["token"], types: ReadonlyArray<ExpressionWithTypeArguments>): HeritageClause;
+    function updateHeritageClause(node: HeritageClause, types: ReadonlyArray<ExpressionWithTypeArguments>): HeritageClause;
+    function createCatchClause(variableDeclaration: string | VariableDeclaration | undefined, block: Block): CatchClause;
+    function updateCatchClause(node: CatchClause, variableDeclaration: VariableDeclaration | undefined, block: Block): CatchClause;
+    function createPropertyAssignment(name: string | PropertyName, initializer: Expression): PropertyAssignment;
+    function updatePropertyAssignment(node: PropertyAssignment, name: PropertyName, initializer: Expression): PropertyAssignment;
+    function createShorthandPropertyAssignment(name: string | Identifier, objectAssignmentInitializer?: Expression): ShorthandPropertyAssignment;
+    function updateShorthandPropertyAssignment(node: ShorthandPropertyAssignment, name: Identifier, objectAssignmentInitializer: Expression | undefined): ShorthandPropertyAssignment;
+    function createSpreadAssignment(expression: Expression): SpreadAssignment;
+    function updateSpreadAssignment(node: SpreadAssignment, expression: Expression): SpreadAssignment;
+    function createEnumMember(name: string | PropertyName, initializer?: Expression): EnumMember;
+    function updateEnumMember(node: EnumMember, name: PropertyName, initializer: Expression | undefined): EnumMember;
+    function updateSourceFileNode(node: SourceFile, statements: ReadonlyArray<Statement>, isDeclarationFile?: boolean, referencedFiles?: SourceFile["referencedFiles"], typeReferences?: SourceFile["typeReferenceDirectives"], hasNoDefaultLib?: boolean, libReferences?: SourceFile["libReferenceDirectives"]): SourceFile;
+    /**
+     * Creates a shallow, memberwise clone of a node for mutation.
+     */
+    function getMutableClone<T extends Node>(node: T): T;
+    /**
+     * Creates a synthetic statement to act as a placeholder for a not-emitted statement in
+     * order to preserve comments.
+     *
+     * @param original The original statement.
+     */
+    function createNotEmittedStatement(original: Node): NotEmittedStatement;
+    /**
+     * Creates a synthetic element to act as a placeholder for the end of an emitted declaration in
+     * order to properly emit exports.
+     */
+    function createEndOfDeclarationMarker(original: Node): EndOfDeclarationMarker;
+    /**
+     * Creates a synthetic element to act as a placeholder for the beginning of a merged declaration in
+     * order to properly emit exports.
+     */
+    function createMergeDeclarationMarker(original: Node): MergeDeclarationMarker;
+    /**
+     * Creates a synthetic expression to act as a placeholder for a not-emitted expression in
+     * order to preserve comments or sourcemap positions.
+     *
+     * @param expression The inner expression to emit.
+     * @param original The original outer expression.
+     * @param location The location for the expression. Defaults to the positions from "original" if provided.
+     */
+    function createPartiallyEmittedExpression(expression: Expression, original?: Node): PartiallyEmittedExpression;
+    function updatePartiallyEmittedExpression(node: PartiallyEmittedExpression, expression: Expression): PartiallyEmittedExpression;
+    function createCommaList(elements: ReadonlyArray<Expression>): CommaListExpression;
+    function updateCommaList(node: CommaListExpression, elements: ReadonlyArray<Expression>): CommaListExpression;
+    function createBundle(sourceFiles: ReadonlyArray<SourceFile>, prepends?: ReadonlyArray<UnparsedSource | InputFiles>): Bundle;
+    function createUnparsedSourceFile(text: string, map?: string): UnparsedSource;
+    function createInputFiles(javascript: string, declaration: string, javascriptMapText?: string, declarationMapText?: string): InputFiles;
+    function updateBundle(node: Bundle, sourceFiles: ReadonlyArray<SourceFile>, prepends?: ReadonlyArray<UnparsedSource>): Bundle;
+    function createImmediatelyInvokedFunctionExpression(statements: ReadonlyArray<Statement>): CallExpression;
+    function createImmediatelyInvokedFunctionExpression(statements: ReadonlyArray<Statement>, param: ParameterDeclaration, paramValue: Expression): CallExpression;
+    function createImmediatelyInvokedArrowFunction(statements: ReadonlyArray<Statement>): CallExpression;
+    function createImmediatelyInvokedArrowFunction(statements: ReadonlyArray<Statement>, param: ParameterDeclaration, paramValue: Expression): CallExpression;
+    function createComma(left: Expression, right: Expression): Expression;
+    function createLessThan(left: Expression, right: Expression): Expression;
+    function createAssignment(left: ObjectLiteralExpression | ArrayLiteralExpression, right: Expression): DestructuringAssignment;
+    function createAssignment(left: Expression, right: Expression): BinaryExpression;
+    function createStrictEquality(left: Expression, right: Expression): BinaryExpression;
+    function createStrictInequality(left: Expression, right: Expression): BinaryExpression;
+    function createAdd(left: Expression, right: Expression): BinaryExpression;
+    function createSubtract(left: Expression, right: Expression): BinaryExpression;
+    function createPostfixIncrement(operand: Expression): PostfixUnaryExpression;
+    function createLogicalAnd(left: Expression, right: Expression): BinaryExpression;
+    function createLogicalOr(left: Expression, right: Expression): BinaryExpression;
+    function createLogicalNot(operand: Expression): PrefixUnaryExpression;
+    function createVoidZero(): VoidExpression;
+    function createExportDefault(expression: Expression): ExportAssignment;
+    function createExternalModuleExport(exportName: Identifier): ExportDeclaration;
+    /**
+     * Clears any EmitNode entries from parse-tree nodes.
+     * @param sourceFile A source file.
+     */
+    function disposeEmitNodes(sourceFile: SourceFile): void;
+    /**
+     * Associates a node with the current transformation, initializing
+     * various transient transformation properties.
+     */
+    function getOrCreateEmitNode(node: Node): EmitNode;
+    function setTextRange<T extends TextRange>(range: T, location: TextRange | undefined): T;
+    /**
+     * Sets flags that control emit behavior of a node.
+     */
+    function setEmitFlags<T extends Node>(node: T, emitFlags: EmitFlags): T;
+    /**
+     * Sets flags that control emit behavior of a node.
+     */
+    function addEmitFlags<T extends Node>(node: T, emitFlags: EmitFlags): T;
+    /**
+     * Gets a custom text range to use when emitting source maps.
+     */
+    function getSourceMapRange(node: Node): SourceMapRange;
+    /**
+     * Sets a custom text range to use when emitting source maps.
+     */
+    function setSourceMapRange<T extends Node>(node: T, range: SourceMapRange | undefined): T;
+    /**
+     * Create an external source map source file reference
+     */
+    function createSourceMapSource(fileName: string, text: string, skipTrivia?: (pos: number) => number): SourceMapSource;
+    /**
+     * Gets the TextRange to use for source maps for a token of a node.
+     */
+    function getTokenSourceMapRange(node: Node, token: SyntaxKind): SourceMapRange | undefined;
+    /**
+     * Sets the TextRange to use for source maps for a token of a node.
+     */
+    function setTokenSourceMapRange<T extends Node>(node: T, token: SyntaxKind, range: SourceMapRange | undefined): T;
+    /**
+     * Gets a custom text range to use when emitting comments.
+     */
+    function getStartsOnNewLine(node: Node): boolean | undefined;
+    /**
+     * Sets a custom text range to use when emitting comments.
+     */
+    function setStartsOnNewLine<T extends Node>(node: T, newLine: boolean): T;
+    /**
+     * Gets a custom text range to use when emitting comments.
+     */
+    function getCommentRange(node: Node): TextRange;
+    /**
+     * Sets a custom text range to use when emitting comments.
+     */
+    function setCommentRange<T extends Node>(node: T, range: TextRange): T;
+    function getSyntheticLeadingComments(node: Node): SynthesizedComment[] | undefined;
+    function setSyntheticLeadingComments<T extends Node>(node: T, comments: SynthesizedComment[] | undefined): T;
+    function addSyntheticLeadingComment<T extends Node>(node: T, kind: SyntaxKind.SingleLineCommentTrivia | SyntaxKind.MultiLineCommentTrivia, text: string, hasTrailingNewLine?: boolean): T;
+    function getSyntheticTrailingComments(node: Node): SynthesizedComment[] | undefined;
+    function setSyntheticTrailingComments<T extends Node>(node: T, comments: SynthesizedComment[] | undefined): T;
+    function addSyntheticTrailingComment<T extends Node>(node: T, kind: SyntaxKind.SingleLineCommentTrivia | SyntaxKind.MultiLineCommentTrivia, text: string, hasTrailingNewLine?: boolean): T;
+    function moveSyntheticComments<T extends Node>(node: T, original: Node): T;
+    /**
+     * Gets the constant value to emit for an expression.
+     */
+    function getConstantValue(node: PropertyAccessExpression | ElementAccessExpression): string | number | undefined;
+    /**
+     * Sets the constant value to emit for an expression.
+     */
+    function setConstantValue(node: PropertyAccessExpression | ElementAccessExpression, value: string | number): PropertyAccessExpression | ElementAccessExpression;
+    /**
+     * Adds an EmitHelper to a node.
+     */
+    function addEmitHelper<T extends Node>(node: T, helper: EmitHelper): T;
+    /**
+     * Add EmitHelpers to a node.
+     */
+    function addEmitHelpers<T extends Node>(node: T, helpers: EmitHelper[] | undefined): T;
+    /**
+     * Removes an EmitHelper from a node.
+     */
+    function removeEmitHelper(node: Node, helper: EmitHelper): boolean;
+    /**
+     * Gets the EmitHelpers of a node.
+     */
+    function getEmitHelpers(node: Node): EmitHelper[] | undefined;
+    /**
+     * Moves matching emit helpers from a source node to a target node.
+     */
+    function moveEmitHelpers(source: Node, target: Node, predicate: (helper: EmitHelper) => boolean): void;
+    function compareEmitHelpers(x: EmitHelper, y: EmitHelper): Comparison;
+    function setOriginalNode<T extends Node>(node: T, original: Node | undefined): T;
+}
+declare namespace ts {
+    const nullTransformationContext: TransformationContext;
+    type TypeOfTag = "undefined" | "number" | "boolean" | "string" | "symbol" | "object" | "function";
+    function createTypeCheck(value: Expression, tag: TypeOfTag): BinaryExpression;
+    function createMemberAccessForPropertyName(target: Expression, memberName: PropertyName, location?: TextRange): MemberExpression;
+    function createFunctionCall(func: Expression, thisArg: Expression, argumentsList: ReadonlyArray<Expression>, location?: TextRange): CallExpression;
+    function createFunctionApply(func: Expression, thisArg: Expression, argumentsExpression: Expression, location?: TextRange): CallExpression;
+    function createArraySlice(array: Expression, start?: number | Expression): CallExpression;
+    function createArrayConcat(array: Expression, values: ReadonlyArray<Expression>): CallExpression;
+    function createMathPow(left: Expression, right: Expression, location?: TextRange): CallExpression;
+    function createExpressionForJsxElement(jsxFactoryEntity: EntityName | undefined, reactNamespace: string, tagName: Expression, props: Expression, children: ReadonlyArray<Expression>, parentElement: JsxOpeningLikeElement, location: TextRange): LeftHandSideExpression;
+    function createExpressionForJsxFragment(jsxFactoryEntity: EntityName | undefined, reactNamespace: string, children: ReadonlyArray<Expression>, parentElement: JsxOpeningFragment, location: TextRange): LeftHandSideExpression;
+    function getHelperName(name: string): Identifier;
+    function createValuesHelper(context: TransformationContext, expression: Expression, location?: TextRange): CallExpression;
+    function createReadHelper(context: TransformationContext, iteratorRecord: Expression, count: number | undefined, location?: TextRange): CallExpression;
+    function createSpreadHelper(context: TransformationContext, argumentList: ReadonlyArray<Expression>, location?: TextRange): CallExpression;
+    function createForOfBindingStatement(node: ForInitializer, boundValue: Expression): Statement;
+    function insertLeadingStatement(dest: Statement, source: Statement): Block;
+    function restoreEnclosingLabel(node: Statement, outermostLabeledStatement: LabeledStatement | undefined, afterRestoreLabelCallback?: (node: LabeledStatement) => void): Statement;
+    interface CallBinding {
+        target: LeftHandSideExpression;
+        thisArg: Expression;
+    }
+    function createCallBinding(expression: Expression, recordTempVariable: (temp: Identifier) => void, languageVersion?: ScriptTarget, cacheIdentifiers?: boolean): CallBinding;
+    function inlineExpressions(expressions: ReadonlyArray<Expression>): Expression;
+    function createExpressionFromEntityName(node: EntityName | Expression): Expression;
+    function createExpressionForPropertyName(memberName: PropertyName): Expression;
+    function createExpressionForObjectLiteralElementLike(node: ObjectLiteralExpression, property: ObjectLiteralElementLike, receiver: Expression): Expression | undefined;
+    /**
+     * Gets the internal name of a declaration. This is primarily used for declarations that can be
+     * referred to by name in the body of an ES5 class function body. An internal name will *never*
+     * be prefixed with an module or namespace export modifier like "exports." when emitted as an
+     * expression. An internal name will also *never* be renamed due to a collision with a block
+     * scoped variable.
+     *
+     * @param node The declaration.
+     * @param allowComments A value indicating whether comments may be emitted for the name.
+     * @param allowSourceMaps A value indicating whether source maps may be emitted for the name.
+     */
+    function getInternalName(node: Declaration, allowComments?: boolean, allowSourceMaps?: boolean): Identifier;
+    /**
+     * Gets whether an identifier should only be referred to by its internal name.
+     */
+    function isInternalName(node: Identifier): boolean;
+    /**
+     * Gets the local name of a declaration. This is primarily used for declarations that can be
+     * referred to by name in the declaration's immediate scope (classes, enums, namespaces). A
+     * local name will *never* be prefixed with an module or namespace export modifier like
+     * "exports." when emitted as an expression.
+     *
+     * @param node The declaration.
+     * @param allowComments A value indicating whether comments may be emitted for the name.
+     * @param allowSourceMaps A value indicating whether source maps may be emitted for the name.
+     */
+    function getLocalName(node: Declaration, allowComments?: boolean, allowSourceMaps?: boolean): Identifier;
+    /**
+     * Gets whether an identifier should only be referred to by its local name.
+     */
+    function isLocalName(node: Identifier): boolean;
+    /**
+     * Gets the export name of a declaration. This is primarily used for declarations that can be
+     * referred to by name in the declaration's immediate scope (classes, enums, namespaces). An
+     * export name will *always* be prefixed with an module or namespace export modifier like
+     * `"exports."` when emitted as an expression if the name points to an exported symbol.
+     *
+     * @param node The declaration.
+     * @param allowComments A value indicating whether comments may be emitted for the name.
+     * @param allowSourceMaps A value indicating whether source maps may be emitted for the name.
+     */
+    function getExportName(node: Declaration, allowComments?: boolean, allowSourceMaps?: boolean): Identifier;
+    /**
+     * Gets whether an identifier should only be referred to by its export representation if the
+     * name points to an exported symbol.
+     */
+    function isExportName(node: Identifier): boolean;
+    /**
+     * Gets the name of a declaration for use in declarations.
+     *
+     * @param node The declaration.
+     * @param allowComments A value indicating whether comments may be emitted for the name.
+     * @param allowSourceMaps A value indicating whether source maps may be emitted for the name.
+     */
+    function getDeclarationName(node: Declaration, allowComments?: boolean, allowSourceMaps?: boolean): Identifier;
+    /**
+     * Gets the exported name of a declaration for use in expressions.
+     *
+     * An exported name will *always* be prefixed with an module or namespace export modifier like
+     * "exports." if the name points to an exported symbol.
+     *
+     * @param ns The namespace identifier.
+     * @param node The declaration.
+     * @param allowComments A value indicating whether comments may be emitted for the name.
+     * @param allowSourceMaps A value indicating whether source maps may be emitted for the name.
+     */
+    function getExternalModuleOrNamespaceExportName(ns: Identifier | undefined, node: Declaration, allowComments?: boolean, allowSourceMaps?: boolean): Identifier | PropertyAccessExpression;
+    /**
+     * Gets a namespace-qualified name for use in expressions.
+     *
+     * @param ns The namespace identifier.
+     * @param name The name.
+     * @param allowComments A value indicating whether comments may be emitted for the name.
+     * @param allowSourceMaps A value indicating whether source maps may be emitted for the name.
+     */
+    function getNamespaceMemberName(ns: Identifier, name: Identifier, allowComments?: boolean, allowSourceMaps?: boolean): PropertyAccessExpression;
+    function convertToFunctionBody(node: ConciseBody, multiLine?: boolean): Block;
+    function convertFunctionDeclarationToExpression(node: FunctionDeclaration): FunctionExpression;
+    /**
+     * Add any necessary prologue-directives into target statement-array.
+     * The function needs to be called during each transformation step.
+     * This function needs to be called whenever we transform the statement
+     * list of a source file, namespace, or function-like body.
+     *
+     * @param target: result statements array
+     * @param source: origin statements array
+     * @param ensureUseStrict: boolean determining whether the function need to add prologue-directives
+     * @param visitor: Optional callback used to visit any custom prologue directives.
+     */
+    function addPrologue(target: Statement[], source: ReadonlyArray<Statement>, ensureUseStrict?: boolean, visitor?: (node: Node) => VisitResult<Node>): number;
+    /**
+     * Add just the standard (string-expression) prologue-directives into target statement-array.
+     * The function needs to be called during each transformation step.
+     * This function needs to be called whenever we transform the statement
+     * list of a source file, namespace, or function-like body.
+     */
+    function addStandardPrologue(target: Statement[], source: ReadonlyArray<Statement>, ensureUseStrict?: boolean): number;
+    /**
+     * Add just the custom prologue-directives into target statement-array.
+     * The function needs to be called during each transformation step.
+     * This function needs to be called whenever we transform the statement
+     * list of a source file, namespace, or function-like body.
+     */
+    function addCustomPrologue(target: Statement[], source: ReadonlyArray<Statement>, statementOffset: number, visitor?: (node: Node) => VisitResult<Node>): number;
+    function addCustomPrologue(target: Statement[], source: ReadonlyArray<Statement>, statementOffset: number | undefined, visitor?: (node: Node) => VisitResult<Node>): number | undefined;
+    function startsWithUseStrict(statements: ReadonlyArray<Statement>): boolean;
+    /**
+     * Ensures "use strict" directive is added
+     *
+     * @param statements An array of statements
+     */
+    function ensureUseStrict(statements: NodeArray<Statement>): NodeArray<Statement>;
+    /**
+     * Wraps the operand to a BinaryExpression in parentheses if they are needed to preserve the intended
+     * order of operations.
+     *
+     * @param binaryOperator The operator for the BinaryExpression.
+     * @param operand The operand for the BinaryExpression.
+     * @param isLeftSideOfBinary A value indicating whether the operand is the left side of the
+     *                           BinaryExpression.
+     */
+    function parenthesizeBinaryOperand(binaryOperator: SyntaxKind, operand: Expression, isLeftSideOfBinary: boolean, leftOperand?: Expression): Expression;
+    function parenthesizeForConditionalHead(condition: Expression): Expression;
+    function parenthesizeSubexpressionOfConditionalExpression(e: Expression): Expression;
+    /**
+     *  [Per the spec](https://tc39.github.io/ecma262/#prod-ExportDeclaration), `export default` accepts _AssigmentExpression_ but
+     *  has a lookahead restriction for `function`, `async function`, and `class`.
+     *
+     * Basically, that means we need to parenthesize in the following cases:
+     *
+     * - BinaryExpression of CommaToken
+     * - CommaList (synthetic list of multiple comma expressions)
+     * - FunctionExpression
+     * - ClassExpression
+     */
+    function parenthesizeDefaultExpression(e: Expression): Expression;
+    /**
+     * Wraps an expression in parentheses if it is needed in order to use the expression
+     * as the expression of a NewExpression node.
+     *
+     * @param expression The Expression node.
+     */
+    function parenthesizeForNew(expression: Expression): LeftHandSideExpression;
+    /**
+     * Wraps an expression in parentheses if it is needed in order to use the expression for
+     * property or element access.
+     *
+     * @param expr The expression node.
+     */
+    function parenthesizeForAccess(expression: Expression): LeftHandSideExpression;
+    function parenthesizePostfixOperand(operand: Expression): LeftHandSideExpression;
+    function parenthesizePrefixOperand(operand: Expression): UnaryExpression;
+    function parenthesizeListElements(elements: NodeArray<Expression>): NodeArray<Expression>;
+    function parenthesizeExpressionForList(expression: Expression): Expression;
+    function parenthesizeExpressionForExpressionStatement(expression: Expression): Expression;
+    function parenthesizeConditionalTypeMember(member: TypeNode): TypeNode;
+    function parenthesizeElementTypeMember(member: TypeNode): TypeNode;
+    function parenthesizeArrayTypeMember(member: TypeNode): TypeNode;
+    function parenthesizeElementTypeMembers(members: ReadonlyArray<TypeNode>): NodeArray<TypeNode>;
+    function parenthesizeTypeParameters(typeParameters: ReadonlyArray<TypeNode> | undefined): MutableNodeArray<TypeNode> | undefined;
+    function parenthesizeConciseBody(body: ConciseBody): ConciseBody;
+    enum OuterExpressionKinds {
+        Parentheses = 1,
+        Assertions = 2,
+        PartiallyEmittedExpressions = 4,
+        All = 7
+    }
+    type OuterExpression = ParenthesizedExpression | TypeAssertion | AsExpression | NonNullExpression | PartiallyEmittedExpression;
+    function isOuterExpression(node: Node, kinds?: OuterExpressionKinds): node is OuterExpression;
+    function skipOuterExpressions(node: Expression, kinds?: OuterExpressionKinds): Expression;
+    function skipOuterExpressions(node: Node, kinds?: OuterExpressionKinds): Node;
+    function skipAssertions(node: Expression): Expression;
+    function skipAssertions(node: Node): Node;
+    function recreateOuterExpressions(outerExpression: Expression | undefined, innerExpression: Expression, kinds?: OuterExpressionKinds): Expression;
+    function startOnNewLine<T extends Node>(node: T): T;
+    function getExternalHelpersModuleName(node: SourceFile): Identifier | undefined;
+    function getOrCreateExternalHelpersModuleNameIfNeeded(node: SourceFile, compilerOptions: CompilerOptions, hasExportStarsToExportValues?: boolean, hasImportStarOrImportDefault?: boolean): Identifier | undefined;
+    /**
+     * Get the name of that target module from an import or export declaration
+     */
+    function getLocalNameForExternalImport(node: ImportDeclaration | ExportDeclaration | ImportEqualsDeclaration, sourceFile: SourceFile): Identifier | undefined;
+    /**
+     * Get the name of a target module from an import/export declaration as should be written in the emitted output.
+     * The emitted output name can be different from the input if:
+     *  1. The module has a /// <amd-module name="<new name>" />
+     *  2. --out or --outFile is used, making the name relative to the rootDir
+     *  3- The containing SourceFile has an entry in renamedDependencies for the import as requested by some module loaders (e.g. System).
+     * Otherwise, a new StringLiteral node representing the module name will be returned.
+     */
+    function getExternalModuleNameLiteral(importNode: ImportDeclaration | ExportDeclaration | ImportEqualsDeclaration, sourceFile: SourceFile, host: EmitHost, resolver: EmitResolver, compilerOptions: CompilerOptions): StringLiteral | undefined;
+    /**
+     * Get the name of a module as should be written in the emitted output.
+     * The emitted output name can be different from the input if:
+     *  1. The module has a /// <amd-module name="<new name>" />
+     *  2. --out or --outFile is used, making the name relative to the rootDir
+     * Otherwise, a new StringLiteral node representing the module name will be returned.
+     */
+    function tryGetModuleNameFromFile(file: SourceFile | undefined, host: EmitHost, options: CompilerOptions): StringLiteral | undefined;
+    /**
+     * Gets the initializer of an BindingOrAssignmentElement.
+     */
+    function getInitializerOfBindingOrAssignmentElement(bindingElement: BindingOrAssignmentElement): Expression | undefined;
+    /**
+     * Gets the name of an BindingOrAssignmentElement.
+     */
+    function getTargetOfBindingOrAssignmentElement(bindingElement: BindingOrAssignmentElement): BindingOrAssignmentElementTarget | undefined;
+    /**
+     * Determines whether an BindingOrAssignmentElement is a rest element.
+     */
+    function getRestIndicatorOfBindingOrAssignmentElement(bindingElement: BindingOrAssignmentElement): BindingOrAssignmentElementRestIndicator | undefined;
+    /**
+     * Gets the property name of a BindingOrAssignmentElement
+     */
+    function getPropertyNameOfBindingOrAssignmentElement(bindingElement: BindingOrAssignmentElement): Identifier | StringLiteral | NumericLiteral | ComputedPropertyName | undefined;
+    /**
+     * Gets the elements of a BindingOrAssignmentPattern
+     */
+    function getElementsOfBindingOrAssignmentPattern(name: BindingOrAssignmentPattern): ReadonlyArray<BindingOrAssignmentElement>;
+    function convertToArrayAssignmentElement(element: BindingOrAssignmentElement): Expression;
+    function convertToObjectAssignmentElement(element: BindingOrAssignmentElement): ObjectLiteralElementLike;
+    function convertToAssignmentPattern(node: BindingOrAssignmentPattern): AssignmentPattern;
+    function convertToObjectAssignmentPattern(node: ObjectBindingOrAssignmentPattern): ObjectLiteralExpression;
+    function convertToArrayAssignmentPattern(node: ArrayBindingOrAssignmentPattern): ArrayLiteralExpression;
+    function convertToAssignmentElementTarget(node: BindingOrAssignmentElementTarget): Expression;
+}
+declare namespace ts {
+    /**
+     * Visits a Node using the supplied visitor, possibly returning a new Node in its place.
+     *
+     * @param node The Node to visit.
+     * @param visitor The callback used to visit the Node.
+     * @param test A callback to execute to verify the Node is valid.
+     * @param lift An optional callback to execute to lift a NodeArray into a valid Node.
+     */
+    function visitNode<T extends Node>(node: T | undefined, visitor: Visitor | undefined, test?: (node: Node) => boolean, lift?: (node: NodeArray<Node>) => T): T;
+    /**
+     * Visits a Node using the supplied visitor, possibly returning a new Node in its place.
+     *
+     * @param node The Node to visit.
+     * @param visitor The callback used to visit the Node.
+     * @param test A callback to execute to verify the Node is valid.
+     * @param lift An optional callback to execute to lift a NodeArray into a valid Node.
+     */
+    function visitNode<T extends Node>(node: T | undefined, visitor: Visitor | undefined, test?: (node: Node) => boolean, lift?: (node: NodeArray<Node>) => T): T | undefined;
+    /**
+     * Visits a NodeArray using the supplied visitor, possibly returning a new NodeArray in its place.
+     *
+     * @param nodes The NodeArray to visit.
+     * @param visitor The callback used to visit a Node.
+     * @param test A node test to execute for each node.
+     * @param start An optional value indicating the starting offset at which to start visiting.
+     * @param count An optional value indicating the maximum number of nodes to visit.
+     */
+    function visitNodes<T extends Node>(nodes: NodeArray<T> | undefined, visitor: Visitor, test?: (node: Node) => boolean, start?: number, count?: number): NodeArray<T>;
+    /**
+     * Visits a NodeArray using the supplied visitor, possibly returning a new NodeArray in its place.
+     *
+     * @param nodes The NodeArray to visit.
+     * @param visitor The callback used to visit a Node.
+     * @param test A node test to execute for each node.
+     * @param start An optional value indicating the starting offset at which to start visiting.
+     * @param count An optional value indicating the maximum number of nodes to visit.
+     */
+    function visitNodes<T extends Node>(nodes: NodeArray<T> | undefined, visitor: Visitor, test?: (node: Node) => boolean, start?: number, count?: number): NodeArray<T> | undefined;
+    /**
+     * Starts a new lexical environment and visits a statement list, ending the lexical environment
+     * and merging hoisted declarations upon completion.
+     */
+    function visitLexicalEnvironment(statements: NodeArray<Statement>, visitor: Visitor, context: TransformationContext, start?: number, ensureUseStrict?: boolean): NodeArray<Statement>;
+    /**
+     * Starts a new lexical environment and visits a parameter list, suspending the lexical
+     * environment upon completion.
+     */
+    function visitParameterList(nodes: NodeArray<ParameterDeclaration> | undefined, visitor: Visitor, context: TransformationContext, nodesVisitor?: typeof visitNodes): NodeArray<ParameterDeclaration>;
+    /**
+     * Resumes a suspended lexical environment and visits a function body, ending the lexical
+     * environment and merging hoisted declarations upon completion.
+     */
+    function visitFunctionBody(node: FunctionBody, visitor: Visitor, context: TransformationContext): FunctionBody;
+    /**
+     * Resumes a suspended lexical environment and visits a function body, ending the lexical
+     * environment and merging hoisted declarations upon completion.
+     */
+    function visitFunctionBody(node: FunctionBody | undefined, visitor: Visitor, context: TransformationContext): FunctionBody | undefined;
+    /**
+     * Resumes a suspended lexical environment and visits a concise body, ending the lexical
+     * environment and merging hoisted declarations upon completion.
+     */
+    function visitFunctionBody(node: ConciseBody, visitor: Visitor, context: TransformationContext): ConciseBody;
+    /**
+     * Visits each child of a Node using the supplied visitor, possibly returning a new Node of the same kind in its place.
+     *
+     * @param node The Node whose children will be visited.
+     * @param visitor The callback used to visit each child.
+     * @param context A lexical environment context for the visitor.
+     */
+    function visitEachChild<T extends Node>(node: T, visitor: Visitor, context: TransformationContext): T;
+    /**
+     * Visits each child of a Node using the supplied visitor, possibly returning a new Node of the same kind in its place.
+     *
+     * @param node The Node whose children will be visited.
+     * @param visitor The callback used to visit each child.
+     * @param context A lexical environment context for the visitor.
+     */
+    function visitEachChild<T extends Node>(node: T | undefined, visitor: Visitor, context: TransformationContext, nodesVisitor?: typeof visitNodes, tokenVisitor?: Visitor): T | undefined;
+}
+declare namespace ts {
+    /**
+     * Similar to `reduceLeft`, performs a reduction against each child of a node.
+     * NOTE: Unlike `forEachChild`, this does *not* visit every node.
+     *
+     * @param node The node containing the children to reduce.
+     * @param initial The initial value to supply to the reduction.
+     * @param f The callback function
+     */
+    function reduceEachChild<T>(node: Node | undefined, initial: T, cbNode: (memo: T, node: Node) => T, cbNodeArray?: (memo: T, nodes: NodeArray<Node>) => T): T;
+    /**
+     * Merges generated lexical declarations into a new statement list.
+     */
+    function mergeLexicalEnvironment(statements: NodeArray<Statement>, declarations: ReadonlyArray<Statement> | undefined): NodeArray<Statement>;
+    /**
+     * Appends generated lexical declarations to an array of statements.
+     */
+    function mergeLexicalEnvironment(statements: Statement[], declarations: ReadonlyArray<Statement> | undefined): Statement[];
+    /**
+     * Lifts a NodeArray containing only Statement nodes to a block.
+     *
+     * @param nodes The NodeArray.
+     */
+    function liftToBlock(nodes: ReadonlyArray<Node>): Statement;
+    /**
+     * Aggregates the TransformFlags for a Node and its subtree.
+     */
+    function aggregateTransformFlags<T extends Node>(node: T): T;
+    namespace Debug {
+        function failBadSyntaxKind(node: Node, message?: string): never;
+        const assertEachNode: (nodes: Node[], test: (node: Node) => boolean, message?: string | undefined) => void;
+        const assertNode: (node: Node | undefined, test: ((node: Node | undefined) => boolean) | undefined, message?: string | undefined) => void;
+        const assertOptionalNode: (node: Node, test: (node: Node) => boolean, message?: string | undefined) => void;
+        const assertOptionalToken: (node: Node, kind: SyntaxKind, message?: string | undefined) => void;
+        const assertMissingNode: typeof noop;
+        /**
+         * Injects debug information into frequently used types.
+         */
+        function enableDebugInfo(): void;
+    }
+}
+declare namespace ts {
+    function getOriginalNodeId(node: Node): number;
+    interface ExternalModuleInfo {
+        externalImports: (ImportDeclaration | ImportEqualsDeclaration | ExportDeclaration)[];
+        externalHelpersImportDeclaration: ImportDeclaration | undefined;
+        exportSpecifiers: Map<ExportSpecifier[]>;
+        exportedBindings: Identifier[][];
+        exportedNames: Identifier[] | undefined;
+        exportEquals: ExportAssignment | undefined;
+        hasExportStarsToExportValues: boolean;
+    }
+    function chainBundle(transformSourceFile: (x: SourceFile) => SourceFile): (x: SourceFile | Bundle) => SourceFile | Bundle;
+    function getImportNeedsImportStarHelper(node: ImportDeclaration): boolean;
+    function getImportNeedsImportDefaultHelper(node: ImportDeclaration): boolean;
+    function collectExternalModuleInfo(sourceFile: SourceFile, resolver: EmitResolver, compilerOptions: CompilerOptions): ExternalModuleInfo;
+    /**
+     * Used in the module transformer to check if an expression is reasonably without sideeffect,
+     *  and thus better to copy into multiple places rather than to cache in a temporary variable
+     *  - this is mostly subjective beyond the requirement that the expression not be sideeffecting
+     */
+    function isSimpleCopiableExpression(expression: Expression): boolean;
+    /**
+     * @param input Template string input strings
+     * @param args Names which need to be made file-level unique
+     */
+    function helperString(input: TemplateStringsArray, ...args: string[]): (uniqueName: EmitHelperUniqueNameCallback) => string;
+}
+declare namespace ts {
+    enum FlattenLevel {
+        All = 0,
+        ObjectRest = 1
+    }
+    /**
+     * Flattens a DestructuringAssignment or a VariableDeclaration to an expression.
+     *
+     * @param node The node to flatten.
+     * @param visitor An optional visitor used to visit initializers.
+     * @param context The transformation context.
+     * @param level Indicates the extent to which flattening should occur.
+     * @param needsValue An optional value indicating whether the value from the right-hand-side of
+     * the destructuring assignment is needed as part of a larger expression.
+     * @param createAssignmentCallback An optional callback used to create the assignment expression.
+     */
+    function flattenDestructuringAssignment(node: VariableDeclaration | DestructuringAssignment, visitor: ((node: Node) => VisitResult<Node>) | undefined, context: TransformationContext, level: FlattenLevel, needsValue?: boolean, createAssignmentCallback?: (name: Identifier, value: Expression, location?: TextRange) => Expression): Expression;
+    /**
+     * Flattens a VariableDeclaration or ParameterDeclaration to one or more variable declarations.
+     *
+     * @param node The node to flatten.
+     * @param visitor An optional visitor used to visit initializers.
+     * @param context The transformation context.
+     * @param boundValue The value bound to the declaration.
+     * @param skipInitializer A value indicating whether to ignore the initializer of `node`.
+     * @param hoistTempVariables Indicates whether temporary variables should not be recorded in-line.
+     * @param level Indicates the extent to which flattening should occur.
+     */
+    function flattenDestructuringBinding(node: VariableDeclaration | ParameterDeclaration, visitor: (node: Node) => VisitResult<Node>, context: TransformationContext, level: FlattenLevel, rval?: Expression, hoistTempVariables?: boolean, skipInitializer?: boolean): VariableDeclaration[];
+}
+declare namespace ts {
+    function transformTypeScript(context: TransformationContext): (node: SourceFile | Bundle) => SourceFile | Bundle;
+}
+declare namespace ts {
+    function transformES2017(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle;
+    const asyncSuperHelper: EmitHelper;
+    const advancedAsyncSuperHelper: EmitHelper;
+}
+declare namespace ts {
+    function transformESNext(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle;
+    function createAssignHelper(context: TransformationContext, attributesSegments: Expression[]): CallExpression;
+}
+declare namespace ts {
+    function transformJsx(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle;
+}
+declare namespace ts {
+    function transformES2016(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle;
+}
+declare namespace ts {
+    function transformES2015(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle;
+}
+declare namespace ts {
+    /**
+     * Transforms ES5 syntax into ES3 syntax.
+     *
+     * @param context Context and state information for the transformation.
+     */
+    function transformES5(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle;
+}
+declare namespace ts {
+    function transformGenerators(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle;
+}
+declare namespace ts {
+    function transformModule(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle;
+}
+declare namespace ts {
+    function transformSystemModule(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle;
+}
+declare namespace ts {
+    function transformES2015Module(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle;
+}
+declare namespace ts {
+    type GetSymbolAccessibilityDiagnostic = (symbolAccessibilityResult: SymbolAccessibilityResult) => (SymbolAccessibilityDiagnostic | undefined);
+    interface SymbolAccessibilityDiagnostic {
+        errorNode: Node;
+        diagnosticMessage: DiagnosticMessage;
+        typeName?: DeclarationName | QualifiedName;
+    }
+    type DeclarationDiagnosticProducing = VariableDeclaration | PropertyDeclaration | PropertySignature | BindingElement | SetAccessorDeclaration | GetAccessorDeclaration | ConstructSignatureDeclaration | CallSignatureDeclaration | MethodDeclaration | MethodSignature | FunctionDeclaration | ParameterDeclaration | TypeParameterDeclaration | ExpressionWithTypeArguments | ImportEqualsDeclaration | TypeAliasDeclaration | ConstructorDeclaration | IndexSignatureDeclaration;
+    function canProduceDiagnostics(node: Node): node is DeclarationDiagnosticProducing;
+    function createGetSymbolAccessibilityDiagnosticForNodeName(node: DeclarationDiagnosticProducing): (symbolAccessibilityResult: SymbolAccessibilityResult) => SymbolAccessibilityDiagnostic | undefined;
+    function createGetSymbolAccessibilityDiagnosticForNode(node: DeclarationDiagnosticProducing): (symbolAccessibilityResult: SymbolAccessibilityResult) => SymbolAccessibilityDiagnostic | undefined;
+}
+declare namespace ts {
+    function getDeclarationDiagnostics(host: EmitHost, resolver: EmitResolver, file: SourceFile | undefined): DiagnosticWithLocation[] | undefined;
+    /**
+     * Transforms a ts file into a .d.ts file
+     * This process requires type information, which is retrieved through the emit resolver. Because of this,
+     * in many places this transformer assumes it will be operating on parse tree nodes directly.
+     * This means that _no transforms should be allowed to occur before this one_.
+     */
+    function transformDeclarations(context: TransformationContext): {
+        (node: Bundle): Bundle;
+        (node: SourceFile): SourceFile;
+        (node: SourceFile | Bundle): SourceFile | Bundle;
+    };
+}
+declare namespace ts {
+    function getTransformers(compilerOptions: CompilerOptions, customTransformers?: CustomTransformers): TransformerFactory<SourceFile | Bundle>[];
+    /**
+     * Transforms an array of SourceFiles by passing them through each transformer.
+     *
+     * @param resolver The emit resolver provided by the checker.
+     * @param host The emit host object used to interact with the file system.
+     * @param options Compiler options to surface in the `TransformationContext`.
+     * @param nodes An array of nodes to transform.
+     * @param transforms An array of `TransformerFactory` callbacks.
+     * @param allowDtsFiles A value indicating whether to allow the transformation of .d.ts files.
+     */
+    function transformNodes<T extends Node>(resolver: EmitResolver | undefined, host: EmitHost | undefined, options: CompilerOptions, nodes: ReadonlyArray<T>, transformers: ReadonlyArray<TransformerFactory<T>>, allowDtsFiles: boolean): TransformationResult<T>;
+}
+declare namespace ts {
+    interface SourceMapWriter {
+        /**
+         * Initialize the SourceMapWriter for a new output file.
+         *
+         * @param filePath The path to the generated output file.
+         * @param sourceMapFilePath The path to the output source map file.
+         * @param sourceFileOrBundle The input source file or bundle for the program.
+         */
+        initialize(filePath: string, sourceMapFilePath: string | undefined, sourceFileOrBundle: SourceFile | Bundle, sourceMapOutput?: SourceMapData[]): void;
+        /**
+         * Reset the SourceMapWriter to an empty state.
+         */
+        reset(): void;
+        /**
+         * Set the current source file.
+         *
+         * @param sourceFile The source file.
+         */
+        setSourceFile(sourceFile: SourceMapSource): void;
+        /**
+         * Emits a mapping.
+         *
+         * If the position is synthetic (undefined or a negative value), no mapping will be
+         * created.
+         *
+         * @param pos The position.
+         */
+        emitPos(pos: number): void;
+        /**
+         * Emits a node with possible leading and trailing source maps.
+         *
+         * @param hint The current emit context
+         * @param node The node to emit.
+         * @param emitCallback The callback used to emit the node.
+         */
+        emitNodeWithSourceMap(hint: EmitHint, node: Node, emitCallback: (hint: EmitHint, node: Node) => void): void;
+        /**
+         * Emits a token of a node node with possible leading and trailing source maps.
+         *
+         * @param node The node containing the token.
+         * @param token The token to emit.
+         * @param tokenStartPos The start pos of the token.
+         * @param emitCallback The callback used to emit the token.
+         */
+        emitTokenWithSourceMap(node: Node, token: SyntaxKind, writer: (s: string) => void, tokenStartPos: number, emitCallback: (token: SyntaxKind, writer: (s: string) => void, tokenStartPos: number) => number): number;
+        /**
+         * Gets the text for the source map.
+         */
+        getText(): string;
+        /**
+         * Gets the SourceMappingURL for the source map.
+         */
+        getSourceMappingURL(): string;
+    }
+    interface SourceMapOptions {
+        sourceMap?: boolean;
+        inlineSourceMap?: boolean;
+        inlineSources?: boolean;
+        sourceRoot?: string;
+        mapRoot?: string;
+        extendedDiagnostics?: boolean;
+    }
+    function createSourceMapWriter(host: EmitHost, writer: EmitTextWriter, compilerOptions?: SourceMapOptions): SourceMapWriter;
+}
+declare namespace ts {
+    interface CommentWriter {
+        reset(): void;
+        setSourceFile(sourceFile: SourceFile): void;
+        setWriter(writer: EmitTextWriter | undefined): void;
+        emitNodeWithComments(hint: EmitHint, node: Node | undefined, emitCallback: (hint: EmitHint, node: Node) => void): void;
+        emitBodyWithDetachedComments(node: Node, detachedRange: TextRange, emitCallback: (node: Node) => void): void;
+        emitTrailingCommentsOfPosition(pos: number, prefixSpace?: boolean): void;
+        emitLeadingCommentsOfPosition(pos: number): void;
+    }
+    function createCommentWriter(printerOptions: PrinterOptions, emitPos: ((pos: number) => void) | undefined): CommentWriter;
+}
+declare namespace ts {
+    /**
+     * Iterates over the source files that are expected to have an emit output.
+     *
+     * @param host An EmitHost.
+     * @param action The action to execute.
+     * @param sourceFilesOrTargetSourceFile
+     *   If an array, the full list of source files to emit.
+     *   Else, calls `getSourceFilesToEmit` with the (optional) target source file to determine the list of source files to emit.
+     */
+    function forEachEmittedFile<T>(host: EmitHost, action: (emitFileNames: EmitFileNames, sourceFileOrBundle: SourceFile | Bundle) => T, sourceFilesOrTargetSourceFile?: ReadonlyArray<SourceFile> | SourceFile, emitOnlyDtsFiles?: boolean): T | undefined;
+    function getOutputPathsFor(sourceFile: SourceFile | Bundle, host: EmitHost, forceDtsPaths: boolean): EmitFileNames;
+    function getOutputExtension(sourceFile: SourceFile, options: CompilerOptions): Extension;
+    function emitFiles(resolver: EmitResolver, host: EmitHost, targetSourceFile: SourceFile, emitOnlyDtsFiles?: boolean, transformers?: TransformerFactory<Bundle | SourceFile>[], declarationTransformers?: TransformerFactory<Bundle | SourceFile>[]): EmitResult;
+    function createPrinter(printerOptions?: PrinterOptions, handlers?: PrintHandlers): Printer;
+}
+declare namespace ts {
+    /**
+     * Partial interface of the System thats needed to support the caching of directory structure
+     */
+    interface DirectoryStructureHost {
+        fileExists(path: string): boolean;
+        readFile(path: string, encoding?: string): string | undefined;
+        directoryExists?(path: string): boolean;
+        getDirectories?(path: string): string[];
+        readDirectory?(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
+        createDirectory?(path: string): void;
+        writeFile?(path: string, data: string, writeByteOrderMark?: boolean): void;
+    }
+    interface FileAndDirectoryExistence {
+        fileExists: boolean;
+        directoryExists: boolean;
+    }
+    interface CachedDirectoryStructureHost extends DirectoryStructureHost {
+        useCaseSensitiveFileNames: boolean;
+        getDirectories(path: string): string[];
+        readDirectory(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
+        /** Returns the queried result for the file exists and directory exists if at all it was done */
+        addOrDeleteFileOrDirectory(fileOrDirectory: string, fileOrDirectoryPath: Path): FileAndDirectoryExistence | undefined;
+        addOrDeleteFile(fileName: string, filePath: Path, eventKind: FileWatcherEventKind): void;
+        clearCache(): void;
+    }
+    function createCachedDirectoryStructureHost(host: DirectoryStructureHost, currentDirectory: string, useCaseSensitiveFileNames: boolean): CachedDirectoryStructureHost | undefined;
+    enum ConfigFileProgramReloadLevel {
+        None = 0,
+        /** Update the file name list from the disk */
+        Partial = 1,
+        /** Reload completely by re-reading contents of config file from disk and updating program */
+        Full = 2
+    }
+    /**
+     * Updates the existing missing file watches with the new set of missing files after new program is created
+     */
+    function updateMissingFilePathsWatch(program: Program, missingFileWatches: Map<FileWatcher>, createMissingFileWatch: (missingFilePath: Path) => FileWatcher): void;
+    interface WildcardDirectoryWatcher {
+        watcher: FileWatcher;
+        flags: WatchDirectoryFlags;
+    }
+    /**
+     * Updates the existing wild card directory watches with the new set of wild card directories from the config file
+     * after new program is created because the config file was reloaded or program was created first time from the config file
+     * Note that there is no need to call this function when the program is updated with additional files without reloading config files,
+     * as wildcard directories wont change unless reloading config file
+     */
+    function updateWatchingWildcardDirectories(existingWatchedForWildcards: Map<WildcardDirectoryWatcher>, wildcardDirectories: Map<WatchDirectoryFlags>, watchDirectory: (directory: string, flags: WatchDirectoryFlags) => FileWatcher): void;
+    function isEmittedFileOfProgram(program: Program | undefined, file: string): boolean;
+    enum WatchLogLevel {
+        None = 0,
+        TriggerOnly = 1,
+        Verbose = 2
+    }
+    interface WatchFileHost {
+        watchFile(path: string, callback: FileWatcherCallback, pollingInterval?: number): FileWatcher;
+    }
+    interface WatchDirectoryHost {
+        watchDirectory(path: string, callback: DirectoryWatcherCallback, recursive?: boolean): FileWatcher;
+    }
+    type WatchFile<X, Y> = (host: WatchFileHost, file: string, callback: FileWatcherCallback, pollingInterval: PollingInterval, detailInfo1?: X, detailInfo2?: Y) => FileWatcher;
+    type FilePathWatcherCallback = (fileName: string, eventKind: FileWatcherEventKind, filePath: Path) => void;
+    type WatchFilePath<X, Y> = (host: WatchFileHost, file: string, callback: FilePathWatcherCallback, pollingInterval: PollingInterval, path: Path, detailInfo1?: X, detailInfo2?: Y) => FileWatcher;
+    type WatchDirectory<X, Y> = (host: WatchDirectoryHost, directory: string, callback: DirectoryWatcherCallback, flags: WatchDirectoryFlags, detailInfo1?: X, detailInfo2?: Y) => FileWatcher;
+    interface WatchFactory<X, Y> {
+        watchFile: WatchFile<X, Y>;
+        watchFilePath: WatchFilePath<X, Y>;
+        watchDirectory: WatchDirectory<X, Y>;
+    }
+    function getWatchFactory<X, Y = undefined>(watchLogLevel: WatchLogLevel, log: (s: string) => void, getDetailWatchInfo?: GetDetailWatchInfo<X, Y>): WatchFactory<X, Y>;
+    type GetDetailWatchInfo<X, Y> = (detailInfo1: X, detailInfo2: Y | undefined) => string;
+    function closeFileWatcherOf<T extends {
+        watcher: FileWatcher;
+    }>(objWithWatcher: T): void;
+}
+declare namespace ts {
+    function findConfigFile(searchPath: string, fileExists: (fileName: string) => boolean, configName?: string): string | undefined;
+    function resolveTripleslashReference(moduleName: string, containingFile: string): string;
+    function computeCommonSourceDirectoryOfFilenames(fileNames: string[], currentDirectory: string, getCanonicalFileName: GetCanonicalFileName): string;
+    function createCompilerHost(options: CompilerOptions, setParentNodes?: boolean): CompilerHost;
+    function getPreEmitDiagnostics(program: Program, sourceFile?: SourceFile, cancellationToken?: CancellationToken): Diagnostic[];
+    interface FormatDiagnosticsHost {
+        getCurrentDirectory(): string;
+        getCanonicalFileName(fileName: string): string;
+        getNewLine(): string;
+    }
+    function formatDiagnostics(diagnostics: ReadonlyArray<Diagnostic>, host: FormatDiagnosticsHost): string;
+    function formatDiagnostic(diagnostic: Diagnostic, host: FormatDiagnosticsHost): string;
+    /** @internal */
+    enum ForegroundColorEscapeSequences {
+        Grey = "\u001B[90m",
+        Red = "\u001B[91m",
+        Yellow = "\u001B[93m",
+        Blue = "\u001B[94m",
+        Cyan = "\u001B[96m"
+    }
+    /** @internal */
+    function formatColorAndReset(text: string, formatStyle: string): string;
+    function formatDiagnosticsWithColorAndContext(diagnostics: ReadonlyArray<Diagnostic>, host: FormatDiagnosticsHost): string;
+    function flattenDiagnosticMessageText(messageText: string | DiagnosticMessageChain | undefined, newLine: string): string;
+    /**
+     * Determines if program structure is upto date or needs to be recreated
+     */
+    function isProgramUptoDate(program: Program | undefined, rootFileNames: string[], newOptions: CompilerOptions, getSourceVersion: (path: Path) => string | undefined, fileExists: (fileName: string) => boolean, hasInvalidatedResolution: HasInvalidatedResolution, hasChangedAutomaticTypeDirectiveNames: boolean): boolean;
+    function getConfigFileParsingDiagnostics(configFileParseResult: ParsedCommandLine): ReadonlyArray<Diagnostic>;
+    /**
+     * Create a new 'Program' instance. A Program is an immutable collection of 'SourceFile's and a 'CompilerOptions'
+     * that represent a compilation unit.
+     *
+     * Creating a program proceeds from a set of root files, expanding the set of inputs by following imports and
+     * triple-slash-reference-path directives transitively. '@types' and triple-slash-reference-types are also pulled in.
+     *
+     * @param createProgramOptions - The options for creating a program.
+     * @returns A 'Program' object.
+     */
+    function createProgram(createProgramOptions: CreateProgramOptions): Program;
+    /**
+     * Create a new 'Program' instance. A Program is an immutable collection of 'SourceFile's and a 'CompilerOptions'
+     * that represent a compilation unit.
+     *
+     * Creating a program proceeds from a set of root files, expanding the set of inputs by following imports and
+     * triple-slash-reference-path directives transitively. '@types' and triple-slash-reference-types are also pulled in.
+     *
+     * @param rootNames - A set of root files.
+     * @param options - The compiler options which should be used.
+     * @param host - The host interacts with the underlying file system.
+     * @param oldProgram - Reuses an old program structure.
+     * @param configFileParsingDiagnostics - error during config file parsing
+     * @returns A 'Program' object.
+     */
+    function createProgram(rootNames: ReadonlyArray<string>, options: CompilerOptions, host?: CompilerHost, oldProgram?: Program, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>): Program;
+    function parseConfigHostFromCompilerHost(host: CompilerHost): ParseConfigFileHost;
+    /**
+     * Returns the target config filename of a project reference
+     */
+    function resolveProjectReferencePath(host: CompilerHost, ref: ProjectReference): string | undefined;
+    /**
+     * Returns a DiagnosticMessage if we won't include a resolved module due to its extension.
+     * The DiagnosticMessage's parameters are the imported module name, and the filename it resolved to.
+     * This returns a diagnostic even if the module will be an untyped module.
+     */
+    function getResolutionDiagnostic(options: CompilerOptions, { extension }: ResolvedModuleFull): DiagnosticMessage | undefined;
+}
+declare namespace ts {
+    interface EmitOutput {
+        outputFiles: OutputFile[];
+        emitSkipped: boolean;
+    }
+    interface OutputFile {
+        name: string;
+        writeByteOrderMark: boolean;
+        text: string;
+    }
+}
+declare namespace ts {
+    function getFileEmitOutput(program: Program, sourceFile: SourceFile, emitOnlyDtsFiles: boolean, cancellationToken?: CancellationToken, customTransformers?: CustomTransformers): EmitOutput;
+    interface BuilderState {
+        /**
+         * Information of the file eg. its version, signature etc
+         */
+        fileInfos: Map<BuilderState.FileInfo>;
+        /**
+         * Contains the map of ReferencedSet=Referenced files of the file if module emit is enabled
+         * Otherwise undefined
+         * Thus non undefined value indicates, module emit
+         */
+        readonly referencedMap: ReadonlyMap<BuilderState.ReferencedSet> | undefined;
+        /**
+         * Map of files that have already called update signature.
+         * That means hence forth these files are assumed to have
+         * no change in their signature for this version of the program
+         */
+        hasCalledUpdateShapeSignature: Map<true>;
+        /**
+         * Cache of all files excluding default library file for the current program
+         */
+        allFilesExcludingDefaultLibraryFile: ReadonlyArray<SourceFile> | undefined;
+        /**
+         * Cache of all the file names
+         */
+        allFileNames: ReadonlyArray<string> | undefined;
+    }
+}
+declare namespace ts.BuilderState {
+    /**
+     * Information about the source file: Its version and optional signature from last emit
+     */
+    interface FileInfo {
+        readonly version: string;
+        signature: string | undefined;
+    }
+    /**
+     * Referenced files with values for the keys as referenced file's path to be true
+     */
+    type ReferencedSet = ReadonlyMap<true>;
+    /**
+     * Compute the hash to store the shape of the file
+     */
+    type ComputeHash = (data: string) => string;
+    /**
+     * Returns true if oldState is reusable, that is the emitKind = module/non module has not changed
+     */
+    function canReuseOldState(newReferencedMap: ReadonlyMap<ReferencedSet> | undefined, oldState: Readonly<BuilderState> | undefined): boolean | undefined;
+    /**
+     * Creates the state of file references and signature for the new program from oldState if it is safe
+     */
+    function create(newProgram: Program, getCanonicalFileName: GetCanonicalFileName, oldState?: Readonly<BuilderState>): BuilderState;
+    /**
+     * Gets the files affected by the path from the program
+     */
+    function getFilesAffectedBy(state: BuilderState, programOfThisState: Program, path: Path, cancellationToken: CancellationToken | undefined, computeHash: ComputeHash, cacheToUpdateSignature?: Map<string>): ReadonlyArray<SourceFile>;
+    /**
+     * Updates the signatures from the cache into state's fileinfo signatures
+     * This should be called whenever it is safe to commit the state of the builder
+     */
+    function updateSignaturesFromCache(state: BuilderState, signatureCache: Map<string>): void;
+    /**
+     * Get all the dependencies of the sourceFile
+     */
+    function getAllDependencies(state: BuilderState, programOfThisState: Program, sourceFile: SourceFile): ReadonlyArray<string>;
+}
+declare namespace ts {
+    /**
+     * State to store the changed files, affected files and cache semantic diagnostics
+     */
+    interface BuilderProgramState extends BuilderState {
+        /**
+         * Cache of semantic diagnostics for files with their Path being the key
+         */
+        semanticDiagnosticsPerFile: Map<ReadonlyArray<Diagnostic>> | undefined;
+        /**
+         * The map has key by source file's path that has been changed
+         */
+        changedFilesSet: Map<true>;
+        /**
+         * Set of affected files being iterated
+         */
+        affectedFiles: ReadonlyArray<SourceFile> | undefined;
+        /**
+         * Current index to retrieve affected file from
+         */
+        affectedFilesIndex: number | undefined;
+        /**
+         * Current changed file for iterating over affected files
+         */
+        currentChangedFilePath: Path | undefined;
+        /**
+         * Map of file signatures, with key being file path, calculated while getting current changed file's affected files
+         * These will be commited whenever the iteration through affected files of current changed file is complete
+         */
+        currentAffectedFilesSignatures: Map<string> | undefined;
+        /**
+         * Already seen affected files
+         */
+        seenAffectedFiles: Map<true> | undefined;
+        /**
+         * program corresponding to this state
+         */
+        program: Program;
+    }
+    enum BuilderProgramKind {
+        SemanticDiagnosticsBuilderProgram = 0,
+        EmitAndSemanticDiagnosticsBuilderProgram = 1
+    }
+    interface BuilderCreationParameters {
+        newProgram: Program;
+        host: BuilderProgramHost;
+        oldProgram: BuilderProgram | undefined;
+        configFileParsingDiagnostics: ReadonlyArray<Diagnostic>;
+    }
+    function getBuilderCreationParameters(newProgramOrRootNames: Program | ReadonlyArray<string> | undefined, hostOrOptions: BuilderProgramHost | CompilerOptions | undefined, oldProgramOrHost?: BuilderProgram | CompilerHost, configFileParsingDiagnosticsOrOldProgram?: ReadonlyArray<Diagnostic> | BuilderProgram, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>): BuilderCreationParameters;
+    function createBuilderProgram(kind: BuilderProgramKind.SemanticDiagnosticsBuilderProgram, builderCreationParameters: BuilderCreationParameters): SemanticDiagnosticsBuilderProgram;
+    function createBuilderProgram(kind: BuilderProgramKind.EmitAndSemanticDiagnosticsBuilderProgram, builderCreationParameters: BuilderCreationParameters): EmitAndSemanticDiagnosticsBuilderProgram;
+}
+declare namespace ts {
+    type AffectedFileResult<T> = {
+        result: T;
+        affected: SourceFile | Program;
+    } | undefined;
+    interface BuilderProgramHost {
+        /**
+         * return true if file names are treated with case sensitivity
+         */
+        useCaseSensitiveFileNames(): boolean;
+        /**
+         * If provided this would be used this hash instead of actual file shape text for detecting changes
+         */
+        createHash?: (data: string) => string;
+        /**
+         * When emit or emitNextAffectedFile are called without writeFile,
+         * this callback if present would be used to write files
+         */
+        writeFile?: WriteFileCallback;
+    }
+    /**
+     * Builder to manage the program state changes
+     */
+    interface BuilderProgram {
+        getState(): BuilderProgramState;
+        /**
+         * Returns current program
+         */
+        getProgram(): Program;
+        /**
+         * Get compiler options of the program
+         */
+        getCompilerOptions(): CompilerOptions;
+        /**
+         * Get the source file in the program with file name
+         */
+        getSourceFile(fileName: string): SourceFile | undefined;
+        /**
+         * Get a list of files in the program
+         */
+        getSourceFiles(): ReadonlyArray<SourceFile>;
+        /**
+         * Get the diagnostics for compiler options
+         */
+        getOptionsDiagnostics(cancellationToken?: CancellationToken): ReadonlyArray<Diagnostic>;
+        /**
+         * Get the diagnostics that dont belong to any file
+         */
+        getGlobalDiagnostics(cancellationToken?: CancellationToken): ReadonlyArray<Diagnostic>;
+        /**
+         * Get the diagnostics from config file parsing
+         */
+        getConfigFileParsingDiagnostics(): ReadonlyArray<Diagnostic>;
+        /**
+         * Get the syntax diagnostics, for all source files if source file is not supplied
+         */
+        getSyntacticDiagnostics(sourceFile?: SourceFile, cancellationToken?: CancellationToken): ReadonlyArray<Diagnostic>;
+        /**
+         * Get all the dependencies of the file
+         */
+        getAllDependencies(sourceFile: SourceFile): ReadonlyArray<string>;
+        /**
+         * Gets the semantic diagnostics from the program corresponding to this state of file (if provided) or whole program
+         * The semantic diagnostics are cached and managed here
+         * Note that it is assumed that when asked about semantic diagnostics through this API,
+         * the file has been taken out of affected files so it is safe to use cache or get from program and cache the diagnostics
+         * In case of SemanticDiagnosticsBuilderProgram if the source file is not provided,
+         * it will iterate through all the affected files, to ensure that cache stays valid and yet provide a way to get all semantic diagnostics
+         */
+        getSemanticDiagnostics(sourceFile?: SourceFile, cancellationToken?: CancellationToken): ReadonlyArray<Diagnostic>;
+        /**
+         * Emits the JavaScript and declaration files.
+         * When targetSource file is specified, emits the files corresponding to that source file,
+         * otherwise for the whole program.
+         * In case of EmitAndSemanticDiagnosticsBuilderProgram, when targetSourceFile is specified,
+         * it is assumed that that file is handled from affected file list. If targetSourceFile is not specified,
+         * it will only emit all the affected files instead of whole program
+         *
+         * The first of writeFile if provided, writeFile of BuilderProgramHost if provided, writeFile of compiler host
+         * in that order would be used to write the files
+         */
+        emit(targetSourceFile?: SourceFile, writeFile?: WriteFileCallback, cancellationToken?: CancellationToken, emitOnlyDtsFiles?: boolean, customTransformers?: CustomTransformers): EmitResult;
+        /**
+         * Get the current directory of the program
+         */
+        getCurrentDirectory(): string;
+    }
+    /**
+     * The builder that caches the semantic diagnostics for the program and handles the changed files and affected files
+     */
+    interface SemanticDiagnosticsBuilderProgram extends BuilderProgram {
+        /**
+         * Gets the semantic diagnostics from the program for the next affected file and caches it
+         * Returns undefined if the iteration is complete
+         */
+        getSemanticDiagnosticsOfNextAffectedFile(cancellationToken?: CancellationToken, ignoreSourceFile?: (sourceFile: SourceFile) => boolean): AffectedFileResult<ReadonlyArray<Diagnostic>>;
+    }
+    /**
+     * The builder that can handle the changes in program and iterate through changed file to emit the files
+     * The semantic diagnostics are cached per file and managed by clearing for the changed/affected files
+     */
+    interface EmitAndSemanticDiagnosticsBuilderProgram extends BuilderProgram {
+        /**
+         * Emits the next affected file's emit result (EmitResult and sourceFiles emitted) or returns undefined if iteration is complete
+         * The first of writeFile if provided, writeFile of BuilderProgramHost if provided, writeFile of compiler host
+         * in that order would be used to write the files
+         */
+        emitNextAffectedFile(writeFile?: WriteFileCallback, cancellationToken?: CancellationToken, emitOnlyDtsFiles?: boolean, customTransformers?: CustomTransformers): AffectedFileResult<EmitResult>;
+    }
+    /**
+     * Create the builder to manage semantic diagnostics and cache them
+     */
+    function createSemanticDiagnosticsBuilderProgram(newProgram: Program, host: BuilderProgramHost, oldProgram?: SemanticDiagnosticsBuilderProgram, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>): SemanticDiagnosticsBuilderProgram;
+    function createSemanticDiagnosticsBuilderProgram(rootNames: ReadonlyArray<string> | undefined, options: CompilerOptions | undefined, host?: CompilerHost, oldProgram?: SemanticDiagnosticsBuilderProgram, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>): SemanticDiagnosticsBuilderProgram;
+    /**
+     * Create the builder that can handle the changes in program and iterate through changed files
+     * to emit the those files and manage semantic diagnostics cache as well
+     */
+    function createEmitAndSemanticDiagnosticsBuilderProgram(newProgram: Program, host: BuilderProgramHost, oldProgram?: EmitAndSemanticDiagnosticsBuilderProgram, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>): EmitAndSemanticDiagnosticsBuilderProgram;
+    function createEmitAndSemanticDiagnosticsBuilderProgram(rootNames: ReadonlyArray<string> | undefined, options: CompilerOptions | undefined, host?: CompilerHost, oldProgram?: EmitAndSemanticDiagnosticsBuilderProgram, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>): EmitAndSemanticDiagnosticsBuilderProgram;
+    /**
+     * Creates a builder thats just abstraction over program and can be used with watch
+     */
+    function createAbstractBuilder(newProgram: Program, host: BuilderProgramHost, oldProgram?: BuilderProgram, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>): BuilderProgram;
+    function createAbstractBuilder(rootNames: ReadonlyArray<string> | undefined, options: CompilerOptions | undefined, host?: CompilerHost, oldProgram?: BuilderProgram, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>): BuilderProgram;
+}
+declare namespace ts {
+    /** This is the cache of module/typedirectives resolution that can be retained across program */
+    interface ResolutionCache {
+        startRecordingFilesWithChangedResolutions(): void;
+        finishRecordingFilesWithChangedResolutions(): Path[] | undefined;
+        resolveModuleNames(moduleNames: string[], containingFile: string, reusedNames: string[] | undefined): ResolvedModuleFull[];
+        getResolvedModuleWithFailedLookupLocationsFromCache(moduleName: string, containingFile: string): CachedResolvedModuleWithFailedLookupLocations | undefined;
+        resolveTypeReferenceDirectives(typeDirectiveNames: string[], containingFile: string): ResolvedTypeReferenceDirective[];
+        invalidateResolutionOfFile(filePath: Path): void;
+        removeResolutionsOfFile(filePath: Path): void;
+        setFilesWithInvalidatedNonRelativeUnresolvedImports(filesWithUnresolvedImports: Map<ReadonlyArray<string>>): void;
+        createHasInvalidatedResolution(forceAllFilesAsInvalidated?: boolean): HasInvalidatedResolution;
+        startCachingPerDirectoryResolution(): void;
+        finishCachingPerDirectoryResolution(): void;
+        updateTypeRootsWatch(): void;
+        closeTypeRootsWatch(): void;
+        clear(): void;
+    }
+    interface ResolutionWithFailedLookupLocations {
+        readonly failedLookupLocations: ReadonlyArray<string>;
+        isInvalidated?: boolean;
+        refCount?: number;
+    }
+    interface CachedResolvedModuleWithFailedLookupLocations extends ResolvedModuleWithFailedLookupLocations, ResolutionWithFailedLookupLocations {
+    }
+    interface ResolutionCacheHost extends ModuleResolutionHost {
+        toPath(fileName: string): Path;
+        getCanonicalFileName: GetCanonicalFileName;
+        getCompilationSettings(): CompilerOptions;
+        watchDirectoryOfFailedLookupLocation(directory: string, cb: DirectoryWatcherCallback, flags: WatchDirectoryFlags): FileWatcher;
+        onInvalidatedResolution(): void;
+        watchTypeRootsDirectory(directory: string, cb: DirectoryWatcherCallback, flags: WatchDirectoryFlags): FileWatcher;
+        onChangedAutomaticTypeDirectiveNames(): void;
+        getCachedDirectoryStructureHost(): CachedDirectoryStructureHost | undefined;
+        projectName?: string;
+        getGlobalCache?(): string | undefined;
+        writeLog(s: string): void;
+        maxNumberOfFilesToIterateForInvalidation?: number;
+        getCurrentProgram(): Program;
+    }
+    const maxNumberOfFilesToIterateForInvalidation = 256;
+    function createResolutionCache(resolutionHost: ResolutionCacheHost, rootDirForResolution: string | undefined, logChangesWhenResolvingModule: boolean): ResolutionCache;
+}
+declare namespace ts.moduleSpecifiers {
+    interface ModuleSpecifierPreferences {
+        importModuleSpecifierPreference?: "relative" | "non-relative";
+    }
+    function getModuleSpecifier(compilerOptions: CompilerOptions, fromSourceFile: SourceFile, fromSourceFileName: string, toFileName: string, host: ModuleSpecifierResolutionHost, preferences?: ModuleSpecifierPreferences): string;
+    function getModuleSpecifiers(moduleSymbol: Symbol, program: Program, importingSourceFile: SourceFile, host: ModuleSpecifierResolutionHost, preferences: ModuleSpecifierPreferences): ReadonlyArray<ReadonlyArray<string>>;
+}
+declare namespace ts {
+    /**
+     * Create a function that reports error by writing to the system and handles the formating of the diagnostic
+     */
+    function createDiagnosticReporter(system: System, pretty?: boolean): DiagnosticReporter;
+    /** @internal */
+    const nonClearingMessageCodes: number[];
+    /** @internal */
+    const screenStartingMessageCodes: number[];
+    /**
+     * Create a function that reports watch status by writing to the system and handles the formating of the diagnostic
+     */
+    function createWatchStatusReporter(system: System, pretty?: boolean): WatchStatusReporter;
+    /** Parses config file using System interface */
+    function parseConfigFileWithSystem(configFileName: string, optionsToExtend: CompilerOptions, system: System, reportDiagnostic: DiagnosticReporter): ParsedCommandLine | undefined;
+    /**
+     * Program structure needed to emit the files and report diagnostics
+     */
+    interface ProgramToEmitFilesAndReportErrors {
+        getCurrentDirectory(): string;
+        getCompilerOptions(): CompilerOptions;
+        getSourceFiles(): ReadonlyArray<SourceFile>;
+        getSyntacticDiagnostics(): ReadonlyArray<Diagnostic>;
+        getOptionsDiagnostics(): ReadonlyArray<Diagnostic>;
+        getGlobalDiagnostics(): ReadonlyArray<Diagnostic>;
+        getSemanticDiagnostics(): ReadonlyArray<Diagnostic>;
+        getConfigFileParsingDiagnostics(): ReadonlyArray<Diagnostic>;
+        emit(): EmitResult;
+    }
+    type ReportEmitErrorSummary = (errorCount: number) => void;
+    /**
+     * Helper that emit files, report diagnostics and lists emitted and/or source files depending on compiler options
+     */
+    function emitFilesAndReportErrors(program: ProgramToEmitFilesAndReportErrors, reportDiagnostic: DiagnosticReporter, writeFileName?: (s: string) => void, reportSummary?: ReportEmitErrorSummary): ExitStatus;
+    /**
+     * Creates the watch compiler host from system for config file in watch mode
+     */
+    function createWatchCompilerHostOfConfigFile<T extends BuilderProgram = EmitAndSemanticDiagnosticsBuilderProgram>(configFileName: string, optionsToExtend: CompilerOptions | undefined, system: System, createProgram?: CreateProgram<T>, reportDiagnostic?: DiagnosticReporter, reportWatchStatus?: WatchStatusReporter): WatchCompilerHostOfConfigFile<T>;
+    /**
+     * Creates the watch compiler host from system for compiling root files and options in watch mode
+     */
+    function createWatchCompilerHostOfFilesAndCompilerOptions<T extends BuilderProgram = EmitAndSemanticDiagnosticsBuilderProgram>(rootFiles: string[], options: CompilerOptions, system: System, createProgram?: CreateProgram<T>, reportDiagnostic?: DiagnosticReporter, reportWatchStatus?: WatchStatusReporter): WatchCompilerHostOfFilesAndCompilerOptions<T>;
+}
+declare namespace ts {
+    type WatchStatusReporter = (diagnostic: Diagnostic, newLine: string, options: CompilerOptions) => void;
+    /** Create the program with rootNames and options, if they are undefined, oldProgram and new configFile diagnostics create new program */
+    type CreateProgram<T extends BuilderProgram> = (rootNames: ReadonlyArray<string> | undefined, options: CompilerOptions | undefined, host?: CompilerHost, oldProgram?: T, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>) => T;
+    interface WatchCompilerHost<T extends BuilderProgram> {
+        /**
+         * Used to create the program when need for program creation or recreation detected
+         */
+        createProgram: CreateProgram<T>;
+        /** If provided, callback to invoke after every new program creation */
+        afterProgramCreate?(program: T): void;
+        /** If provided, called with Diagnostic message that informs about change in watch status */
+        onWatchStatusChange?(diagnostic: Diagnostic, newLine: string, options: CompilerOptions): void;
+        maxNumberOfFilesToIterateForInvalidation?: number;
+        useCaseSensitiveFileNames(): boolean;
+        getNewLine(): string;
+        getCurrentDirectory(): string;
+        getDefaultLibFileName(options: CompilerOptions): string;
+        getDefaultLibLocation?(): string;
+        createHash?(data: string): string;
+        /**
+         * Use to check file presence for source files and
+         * if resolveModuleNames is not provided (complier is in charge of module resolution) then module files as well
+         */
+        fileExists(path: string): boolean;
+        /**
+         * Use to read file text for source files and
+         * if resolveModuleNames is not provided (complier is in charge of module resolution) then module files as well
+         */
+        readFile(path: string, encoding?: string): string | undefined;
+        /** If provided, used for module resolution as well as to handle directory structure */
+        directoryExists?(path: string): boolean;
+        /** If provided, used in resolutions as well as handling directory structure */
+        getDirectories?(path: string): string[];
+        /** If provided, used to cache and handle directory structure modifications */
+        readDirectory?(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
+        /** Symbol links resolution */
+        realpath?(path: string): string;
+        /** If provided would be used to write log about compilation */
+        trace?(s: string): void;
+        /** If provided is used to get the environment variable */
+        getEnvironmentVariable?(name: string): string | undefined;
+        /** If provided, used to resolve the module names, otherwise typescript's default module resolution */
+        resolveModuleNames?(moduleNames: string[], containingFile: string, reusedNames?: string[]): ResolvedModule[];
+        /** If provided, used to resolve type reference directives, otherwise typescript's default resolution */
+        resolveTypeReferenceDirectives?(typeReferenceDirectiveNames: string[], containingFile: string): ResolvedTypeReferenceDirective[];
+        /** Used to watch changes in source files, missing files needed to update the program or config file */
+        watchFile(path: string, callback: FileWatcherCallback, pollingInterval?: number): FileWatcher;
+        /** Used to watch resolved module's failed lookup locations, config file specs, type roots where auto type reference directives are added */
+        watchDirectory(path: string, callback: DirectoryWatcherCallback, recursive?: boolean): FileWatcher;
+        /** If provided, will be used to set delayed compilation, so that multiple changes in short span are compiled together */
+        setTimeout?(callback: (...args: any[]) => void, ms: number, ...args: any[]): any;
+        /** If provided, will be used to reset existing delayed compilation */
+        clearTimeout?(timeoutId: any): void;
+    }
+    /** Internal interface used to wire emit through same host */
+    interface WatchCompilerHost<T extends BuilderProgram> {
+        createDirectory?(path: string): void;
+        writeFile?(path: string, data: string, writeByteOrderMark?: boolean): void;
+        onCachedDirectoryStructureHostCreate?(host: CachedDirectoryStructureHost): void;
+    }
+    /**
+     * Host to create watch with root files and options
+     */
+    interface WatchCompilerHostOfFilesAndCompilerOptions<T extends BuilderProgram> extends WatchCompilerHost<T> {
+        /** root files to use to generate program */
+        rootFiles: string[];
+        /** Compiler options */
+        options: CompilerOptions;
+    }
+    /**
+     * Host to create watch with config file
+     */
+    interface WatchCompilerHostOfConfigFile<T extends BuilderProgram> extends WatchCompilerHost<T>, ConfigFileDiagnosticsReporter {
+        /** Name of the config file to compile */
+        configFileName: string;
+        /** Options to extend */
+        optionsToExtend?: CompilerOptions;
+        /**
+         * Used to generate source file names from the config file and its include, exclude, files rules
+         * and also to cache the directory stucture
+         */
+        readDirectory(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
+    }
+    /**
+     * Host to create watch with config file that is already parsed (from tsc)
+     */
+    interface WatchCompilerHostOfConfigFile<T extends BuilderProgram> extends WatchCompilerHost<T> {
+        optionsToExtend?: CompilerOptions;
+        configFileParsingResult?: ParsedCommandLine;
+    }
+    interface Watch<T> {
+        /** Synchronize with host and get updated program */
+        getProgram(): T;
+        /** Gets the existing program without synchronizing with changes on host */
+        getCurrentProgram(): T;
+    }
+    /**
+     * Creates the watch what generates program using the config file
+     */
+    interface WatchOfConfigFile<T> extends Watch<T> {
+    }
+    /**
+     * Creates the watch that generates program using the root files and compiler options
+     */
+    interface WatchOfFilesAndCompilerOptions<T> extends Watch<T> {
+        /** Updates the root files in the program, only if this is not config file compilation */
+        updateRootFileNames(fileNames: string[]): void;
+    }
+    /**
+     * Create the watch compiler host for either configFile or fileNames and its options
+     */
+    function createWatchCompilerHost<T extends BuilderProgram>(rootFiles: string[], options: CompilerOptions, system: System, createProgram?: CreateProgram<T>, reportDiagnostic?: DiagnosticReporter, reportWatchStatus?: WatchStatusReporter): WatchCompilerHostOfFilesAndCompilerOptions<T>;
+    function createWatchCompilerHost<T extends BuilderProgram>(configFileName: string, optionsToExtend: CompilerOptions | undefined, system: System, createProgram?: CreateProgram<T>, reportDiagnostic?: DiagnosticReporter, reportWatchStatus?: WatchStatusReporter): WatchCompilerHostOfConfigFile<T>;
+    /**
+     * Creates the watch from the host for root files and compiler options
+     */
+    function createWatchProgram<T extends BuilderProgram>(host: WatchCompilerHostOfFilesAndCompilerOptions<T>): WatchOfFilesAndCompilerOptions<T>;
+    /**
+     * Creates the watch from the host for config file
+     */
+    function createWatchProgram<T extends BuilderProgram>(host: WatchCompilerHostOfConfigFile<T>): WatchOfConfigFile<T>;
+}
+declare namespace ts {
+    /**
+     * Branded string for keeping track of when we've turned an ambiguous path
+     * specified like "./blah" to an absolute path to an actual
+     * tsconfig file, e.g. "/root/blah/tsconfig.json"
+     */
+    type ResolvedConfigFileName = string & {
+        _isResolvedConfigFileName: never;
+    };
+    interface BuildHost {
+        verbose(diag: DiagnosticMessage, ...args: string[]): void;
+        error(diag: DiagnosticMessage, ...args: string[]): void;
+        errorDiagnostic(diag: Diagnostic): void;
+        message(diag: DiagnosticMessage, ...args: string[]): void;
+    }
+    /**
+     * A BuildContext tracks what's going on during the course of a build.
+     *
+     * Callers may invoke any number of build requests within the same context;
+     * until the context is reset, each project will only be built at most once.
+     *
+     * Example: In a standard setup where project B depends on project A, and both are out of date,
+     * a failed build of A will result in A remaining out of date. When we try to build
+     * B, we should immediately bail instead of recomputing A's up-to-date status again.
+     *
+     * This also matters for performing fast (i.e. fake) downstream builds of projects
+     * when their upstream .d.ts files haven't changed content (but have newer timestamps)
+     */
+    interface BuildContext {
+        options: BuildOptions;
+        /**
+         * Map from output file name to its pre-build timestamp
+         */
+        unchangedOutputs: FileMap<Date>;
+        /**
+         * Map from config file name to up-to-date status
+         */
+        projectStatus: FileMap<UpToDateStatus>;
+        invalidatedProjects: FileMap<true>;
+        queuedProjects: FileMap<true>;
+        missingRoots: Map<true>;
+    }
+    type Mapper = ReturnType<typeof createDependencyMapper>;
+    interface DependencyGraph {
+        buildQueue: ResolvedConfigFileName[];
+        dependencyMap: Mapper;
+    }
+    interface BuildOptions {
+        dry: boolean;
+        force: boolean;
+        verbose: boolean;
+    }
+    enum UpToDateStatusType {
+        Unbuildable = 0,
+        UpToDate = 1,
+        /**
+         * The project appears out of date because its upstream inputs are newer than its outputs,
+         * but all of its outputs are actually newer than the previous identical outputs of its (.d.ts) inputs.
+         * This means we can Pseudo-build (just touch timestamps), as if we had actually built this project.
+         */
+        UpToDateWithUpstreamTypes = 2,
+        OutputMissing = 3,
+        OutOfDateWithSelf = 4,
+        OutOfDateWithUpstream = 5,
+        UpstreamOutOfDate = 6,
+        UpstreamBlocked = 7,
+        /**
+         * Projects with no outputs (i.e. "solution" files)
+         */
+        ContainerOnly = 8
+    }
+    type UpToDateStatus = Status.Unbuildable | Status.UpToDate | Status.OutputMissing | Status.OutOfDateWithSelf | Status.OutOfDateWithUpstream | Status.UpstreamOutOfDate | Status.UpstreamBlocked | Status.ContainerOnly;
+    namespace Status {
+        /**
+         * The project can't be built at all in its current state. For example,
+         * its config file cannot be parsed, or it has a syntax error or missing file
+         */
+        interface Unbuildable {
+            type: UpToDateStatusType.Unbuildable;
+            reason: string;
+        }
+        /**
+         * This project doesn't have any outputs, so "is it up to date" is a meaningless question.
+         */
+        interface ContainerOnly {
+            type: UpToDateStatusType.ContainerOnly;
+        }
+        /**
+         * The project is up to date with respect to its inputs.
+         * We track what the newest input file is.
+         */
+        interface UpToDate {
+            type: UpToDateStatusType.UpToDate | UpToDateStatusType.UpToDateWithUpstreamTypes;
+            newestInputFileTime: Date;
+            newestInputFileName: string;
+            newestDeclarationFileContentChangedTime: Date;
+            newestOutputFileTime: Date;
+            newestOutputFileName: string;
+            oldestOutputFileName: string;
+        }
+        /**
+         * One or more of the outputs of the project does not exist.
+         */
+        interface OutputMissing {
+            type: UpToDateStatusType.OutputMissing;
+            /**
+             * The name of the first output file that didn't exist
+             */
+            missingOutputFileName: string;
+        }
+        /**
+         * One or more of the project's outputs is older than its newest input.
+         */
+        interface OutOfDateWithSelf {
+            type: UpToDateStatusType.OutOfDateWithSelf;
+            outOfDateOutputFileName: string;
+            newerInputFileName: string;
+        }
+        /**
+         * This project depends on an out-of-date project, so shouldn't be built yet
+         */
+        interface UpstreamOutOfDate {
+            type: UpToDateStatusType.UpstreamOutOfDate;
+            upstreamProjectName: string;
+        }
+        /**
+         * This project depends an upstream project with build errors
+         */
+        interface UpstreamBlocked {
+            type: UpToDateStatusType.UpstreamBlocked;
+            upstreamProjectName: string;
+        }
+        /**
+         * One or more of the project's outputs is older than the newest output of
+         * an upstream project.
+         */
+        interface OutOfDateWithUpstream {
+            type: UpToDateStatusType.OutOfDateWithUpstream;
+            outOfDateOutputFileName: string;
+            newerProjectName: string;
+        }
+    }
+    interface FileMap<T> {
+        setValue(fileName: string, value: T): void;
+        getValue(fileName: string): T | never;
+        getValueOrUndefined(fileName: string): T | undefined;
+        hasKey(fileName: string): boolean;
+        removeKey(fileName: string): void;
+        getKeys(): string[];
+    }
+    function createDependencyMapper(): {
+        addReference: (childConfigFileName: ResolvedConfigFileName, parentConfigFileName: ResolvedConfigFileName) => void;
+        getReferencesTo: (parentConfigFileName: ResolvedConfigFileName) => ResolvedConfigFileName[];
+        getReferencesOf: (childConfigFileName: ResolvedConfigFileName) => ResolvedConfigFileName[];
+        getKeys: () => ReadonlyArray<ResolvedConfigFileName>;
+    };
+    function createBuildContext(options: BuildOptions): BuildContext;
+    function performBuild(args: string[], compilerHost: CompilerHost, buildHost: BuildHost, system?: System): void;
+    /**
+     * A SolutionBuilder has an immutable set of rootNames that are the "entry point" projects, but
+     * can dynamically add/remove other projects based on changes on the rootNames' references
+     */
+    function createSolutionBuilder(compilerHost: CompilerHost, buildHost: BuildHost, rootNames: ReadonlyArray<string>, defaultOptions: BuildOptions, system?: System): {
+        buildAllProjects: () => void;
+        getUpToDateStatus: (project: ParsedCommandLine | undefined) => UpToDateStatus;
+        getUpToDateStatusOfFile: (configFileName: ResolvedConfigFileName) => UpToDateStatus;
+        cleanAllProjects: () => void;
+        resetBuildContext: (opts?: BuildOptions) => void;
+        getBuildGraph: (configFileNames: ReadonlyArray<string>) => DependencyGraph | undefined;
+        invalidateProject: (configFileName: string) => void;
+        buildInvalidatedProjects: () => void;
+        buildDependentInvalidatedProjects: () => void;
+        resolveProjectName: (name: string) => ResolvedConfigFileName | undefined;
+        startWatching: () => void;
+    };
+}
+//# sourceMappingURL=compiler.d.ts.map
+declare namespace ts {
+    interface Node {
+        getSourceFile(): SourceFile;
+        getChildCount(sourceFile?: SourceFile): number;
+        getChildAt(index: number, sourceFile?: SourceFile): Node;
+        getChildren(sourceFile?: SourceFile): Node[];
+        getChildren(sourceFile?: SourceFileLike): Node[];
+        getStart(sourceFile?: SourceFile, includeJsDocComment?: boolean): number;
+        getStart(sourceFile?: SourceFileLike, includeJsDocComment?: boolean): number;
+        getFullStart(): number;
+        getEnd(): number;
+        getWidth(sourceFile?: SourceFileLike): number;
+        getFullWidth(): number;
+        getLeadingTriviaWidth(sourceFile?: SourceFile): number;
+        getFullText(sourceFile?: SourceFile): string;
+        getText(sourceFile?: SourceFile): string;
+        getFirstToken(sourceFile?: SourceFile): Node | undefined;
+        getLastToken(sourceFile?: SourceFile): Node | undefined;
+        forEachChild<T>(cbNode: (node: Node) => T | undefined, cbNodeArray?: (nodes: NodeArray<Node>) => T | undefined): T | undefined;
+    }
+    interface Identifier {
+        readonly text: string;
+    }
+    interface Symbol {
+        readonly name: string;
+        getFlags(): SymbolFlags;
+        getEscapedName(): __String;
+        getName(): string;
+        getDeclarations(): Declaration[] | undefined;
+        getDocumentationComment(typeChecker: TypeChecker | undefined): SymbolDisplayPart[];
+        getJsDocTags(): JSDocTagInfo[];
+    }
+    interface Type {
+        getFlags(): TypeFlags;
+        getSymbol(): Symbol | undefined;
+        getProperties(): Symbol[];
+        getProperty(propertyName: string): Symbol | undefined;
+        getApparentProperties(): Symbol[];
+        getCallSignatures(): Signature[];
+        getConstructSignatures(): Signature[];
+        getStringIndexType(): Type | undefined;
+        getNumberIndexType(): Type | undefined;
+        getBaseTypes(): BaseType[] | undefined;
+        getNonNullableType(): Type;
+        getConstraint(): Type | undefined;
+        getDefault(): Type | undefined;
+        isUnion(): this is UnionType;
+        isIntersection(): this is IntersectionType;
+        isUnionOrIntersection(): this is UnionOrIntersectionType;
+        isLiteral(): this is LiteralType;
+        isStringLiteral(): this is StringLiteralType;
+        isNumberLiteral(): this is NumberLiteralType;
+        isTypeParameter(): this is TypeParameter;
+        isClassOrInterface(): this is InterfaceType;
+        isClass(): this is InterfaceType;
+    }
+    interface Signature {
+        getDeclaration(): SignatureDeclaration;
+        getTypeParameters(): TypeParameter[] | undefined;
+        getParameters(): Symbol[];
+        getReturnType(): Type;
+        getDocumentationComment(typeChecker: TypeChecker | undefined): SymbolDisplayPart[];
+        getJsDocTags(): JSDocTagInfo[];
+    }
+    interface SourceFile {
+        version: string;
+        scriptSnapshot: IScriptSnapshot | undefined;
+        nameTable: UnderscoreEscapedMap<number> | undefined;
+        getNamedDeclarations(): Map<Declaration[]>;
+        getLineAndCharacterOfPosition(pos: number): LineAndCharacter;
+        getLineEndOfPosition(pos: number): number;
+        getLineStarts(): ReadonlyArray<number>;
+        getPositionOfLineAndCharacter(line: number, character: number): number;
+        update(newText: string, textChangeRange: TextChangeRange): SourceFile;
+        sourceMapper?: sourcemaps.SourceMapper;
+    }
+    interface SourceFileLike {
+        getLineAndCharacterOfPosition(pos: number): LineAndCharacter;
+        sourceMapper?: sourcemaps.SourceMapper;
+    }
+    interface SourceMapSource {
+        getLineAndCharacterOfPosition(pos: number): LineAndCharacter;
+    }
+    /**
+     * Represents an immutable snapshot of a script at a specified time.Once acquired, the
+     * snapshot is observably immutable. i.e. the same calls with the same parameters will return
+     * the same values.
+     */
+    interface IScriptSnapshot {
+        /** Gets a portion of the script snapshot specified by [start, end). */
+        getText(start: number, end: number): string;
+        /** Gets the length of this script snapshot. */
+        getLength(): number;
+        /**
+         * Gets the TextChangeRange that describe how the text changed between this text and
+         * an older version.  This information is used by the incremental parser to determine
+         * what sections of the script need to be re-parsed.  'undefined' can be returned if the
+         * change range cannot be determined.  However, in that case, incremental parsing will
+         * not happen and the entire document will be re - parsed.
+         */
+        getChangeRange(oldSnapshot: IScriptSnapshot): TextChangeRange | undefined;
+        /** Releases all resources held by this script snapshot */
+        dispose?(): void;
+    }
+    namespace ScriptSnapshot {
+        function fromString(text: string): IScriptSnapshot;
+    }
+    interface PreProcessedFileInfo {
+        referencedFiles: FileReference[];
+        typeReferenceDirectives: FileReference[];
+        libReferenceDirectives: FileReference[];
+        importedFiles: FileReference[];
+        ambientExternalModules?: string[];
+        isLibFile: boolean;
+    }
+    interface HostCancellationToken {
+        isCancellationRequested(): boolean;
+    }
+    interface InstallPackageOptions {
+        fileName: Path;
+        packageName: string;
+    }
+    interface LanguageServiceHost extends GetEffectiveTypeRootsHost {
+        getCompilationSettings(): CompilerOptions;
+        getNewLine?(): string;
+        getProjectVersion?(): string;
+        getScriptFileNames(): string[];
+        getScriptKind?(fileName: string): ScriptKind;
+        getScriptVersion(fileName: string): string;
+        getScriptSnapshot(fileName: string): IScriptSnapshot | undefined;
+        getProjectReferences?(): ReadonlyArray<ProjectReference> | undefined;
+        getLocalizedDiagnosticMessages?(): any;
+        getCancellationToken?(): HostCancellationToken;
+        getCurrentDirectory(): string;
+        getDefaultLibFileName(options: CompilerOptions): string;
+        log?(s: string): void;
+        trace?(s: string): void;
+        error?(s: string): void;
+        useCaseSensitiveFileNames?(): boolean;
+        readDirectory?(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
+        readFile?(path: string, encoding?: string): string | undefined;
+        realpath?(path: string): string;
+        fileExists?(path: string): boolean;
+        getTypeRootsVersion?(): number;
+        resolveModuleNames?(moduleNames: string[], containingFile: string, reusedNames?: string[]): ResolvedModule[];
+        getResolvedModuleWithFailedLookupLocationsFromCache?(modulename: string, containingFile: string): ResolvedModuleWithFailedLookupLocations | undefined;
+        resolveTypeReferenceDirectives?(typeDirectiveNames: string[], containingFile: string): ResolvedTypeReferenceDirective[];
+        hasInvalidatedResolution?: HasInvalidatedResolution;
+        hasChangedAutomaticTypeDirectiveNames?: boolean;
+        getDirectories?(directoryName: string): string[];
+        /**
+         * Gets a set of custom transformers to use during emit.
+         */
+        getCustomTransformers?(): CustomTransformers | undefined;
+        isKnownTypesPackageName?(name: string): boolean;
+        installPackage?(options: InstallPackageOptions): Promise<ApplyCodeActionCommandResult>;
+    }
+    interface UserPreferences {
+        readonly disableSuggestions?: boolean;
+        readonly quotePreference?: "double" | "single";
+        readonly includeCompletionsForModuleExports?: boolean;
+        readonly includeCompletionsWithInsertText?: boolean;
+        readonly importModuleSpecifierPreference?: "relative" | "non-relative";
+        readonly allowTextChangesInNewFiles?: boolean;
+    }
+    const defaultPreferences: UserPreferences;
+    interface LanguageService {
+        cleanupSemanticCache(): void;
+        getSyntacticDiagnostics(fileName: string): DiagnosticWithLocation[];
+        /** The first time this is called, it will return global diagnostics (no location). */
+        getSemanticDiagnostics(fileName: string): Diagnostic[];
+        getSuggestionDiagnostics(fileName: string): DiagnosticWithLocation[];
+        getCompilerOptionsDiagnostics(): Diagnostic[];
+        /**
+         * @deprecated Use getEncodedSyntacticClassifications instead.
+         */
+        getSyntacticClassifications(fileName: string, span: TextSpan): ClassifiedSpan[];
+        /**
+         * @deprecated Use getEncodedSemanticClassifications instead.
+         */
+        getSemanticClassifications(fileName: string, span: TextSpan): ClassifiedSpan[];
+        getEncodedSyntacticClassifications(fileName: string, span: TextSpan): Classifications;
+        getEncodedSemanticClassifications(fileName: string, span: TextSpan): Classifications;
+        getCompletionsAtPosition(fileName: string, position: number, options: GetCompletionsAtPositionOptions | undefined): CompletionInfo | undefined;
+        getCompletionEntryDetails(fileName: string, position: number, name: string, formatOptions: FormatCodeOptions | FormatCodeSettings | undefined, source: string | undefined, preferences: UserPreferences | undefined): CompletionEntryDetails | undefined;
+        getCompletionEntrySymbol(fileName: string, position: number, name: string, source: string | undefined): Symbol | undefined;
+        getQuickInfoAtPosition(fileName: string, position: number): QuickInfo | undefined;
+        getNameOrDottedNameSpan(fileName: string, startPos: number, endPos: number): TextSpan | undefined;
+        getBreakpointStatementAtPosition(fileName: string, position: number): TextSpan | undefined;
+        getSignatureHelpItems(fileName: string, position: number): SignatureHelpItems | undefined;
+        getRenameInfo(fileName: string, position: number): RenameInfo;
+        findRenameLocations(fileName: string, position: number, findInStrings: boolean, findInComments: boolean): RenameLocation[] | undefined;
+        getDefinitionAtPosition(fileName: string, position: number): DefinitionInfo[] | undefined;
+        getDefinitionAndBoundSpan(fileName: string, position: number): DefinitionInfoAndBoundSpan | undefined;
+        getTypeDefinitionAtPosition(fileName: string, position: number): DefinitionInfo[] | undefined;
+        getImplementationAtPosition(fileName: string, position: number): ImplementationLocation[] | undefined;
+        getReferencesAtPosition(fileName: string, position: number): ReferenceEntry[] | undefined;
+        findReferences(fileName: string, position: number): ReferencedSymbol[] | undefined;
+        getDocumentHighlights(fileName: string, position: number, filesToSearch: string[]): DocumentHighlights[] | undefined;
+        /** @deprecated */
+        getOccurrencesAtPosition(fileName: string, position: number): ReferenceEntry[] | undefined;
+        getNavigateToItems(searchValue: string, maxResultCount?: number, fileName?: string, excludeDtsFiles?: boolean): NavigateToItem[];
+        getNavigationBarItems(fileName: string): NavigationBarItem[];
+        getNavigationTree(fileName: string): NavigationTree;
+        getOutliningSpans(fileName: string): OutliningSpan[];
+        getTodoComments(fileName: string, descriptors: TodoCommentDescriptor[]): TodoComment[];
+        getBraceMatchingAtPosition(fileName: string, position: number): TextSpan[];
+        getIndentationAtPosition(fileName: string, position: number, options: EditorOptions | EditorSettings): number;
+        getFormattingEditsForRange(fileName: string, start: number, end: number, options: FormatCodeOptions | FormatCodeSettings): TextChange[];
+        getFormattingEditsForDocument(fileName: string, options: FormatCodeOptions | FormatCodeSettings): TextChange[];
+        getFormattingEditsAfterKeystroke(fileName: string, position: number, key: string, options: FormatCodeOptions | FormatCodeSettings): TextChange[];
+        getDocCommentTemplateAtPosition(fileName: string, position: number): TextInsertion | undefined;
+        isValidBraceCompletionAtPosition(fileName: string, position: number, openingBrace: number): boolean;
+        /**
+         * This will return a defined result if the position is after the `>` of the opening tag, or somewhere in the text, of a JSXElement with no closing tag.
+         * Editors should call this after `>` is typed.
+         */
+        getJsxClosingTagAtPosition(fileName: string, position: number): JsxClosingTagInfo | undefined;
+        getSpanOfEnclosingComment(fileName: string, position: number, onlyMultiLine: boolean): TextSpan | undefined;
+        toLineColumnOffset?(fileName: string, position: number): LineAndCharacter;
+        getCodeFixesAtPosition(fileName: string, start: number, end: number, errorCodes: ReadonlyArray<number>, formatOptions: FormatCodeSettings, preferences: UserPreferences): ReadonlyArray<CodeFixAction>;
+        getCombinedCodeFix(scope: CombinedCodeFixScope, fixId: {}, formatOptions: FormatCodeSettings, preferences: UserPreferences): CombinedCodeActions;
+        applyCodeActionCommand(action: CodeActionCommand): Promise<ApplyCodeActionCommandResult>;
+        applyCodeActionCommand(action: CodeActionCommand[]): Promise<ApplyCodeActionCommandResult[]>;
+        applyCodeActionCommand(action: CodeActionCommand | CodeActionCommand[]): Promise<ApplyCodeActionCommandResult | ApplyCodeActionCommandResult[]>;
+        /** @deprecated `fileName` will be ignored */
+        applyCodeActionCommand(fileName: string, action: CodeActionCommand): Promise<ApplyCodeActionCommandResult>;
+        /** @deprecated `fileName` will be ignored */
+        applyCodeActionCommand(fileName: string, action: CodeActionCommand[]): Promise<ApplyCodeActionCommandResult[]>;
+        /** @deprecated `fileName` will be ignored */
+        applyCodeActionCommand(fileName: string, action: CodeActionCommand | CodeActionCommand[]): Promise<ApplyCodeActionCommandResult | ApplyCodeActionCommandResult[]>;
+        getApplicableRefactors(fileName: string, positionOrRange: number | TextRange, preferences: UserPreferences | undefined): ApplicableRefactorInfo[];
+        getEditsForRefactor(fileName: string, formatOptions: FormatCodeSettings, positionOrRange: number | TextRange, refactorName: string, actionName: string, preferences: UserPreferences | undefined): RefactorEditInfo | undefined;
+        organizeImports(scope: OrganizeImportsScope, formatOptions: FormatCodeSettings, preferences: UserPreferences | undefined): ReadonlyArray<FileTextChanges>;
+        getEditsForFileRename(oldFilePath: string, newFilePath: string, formatOptions: FormatCodeSettings, preferences: UserPreferences | undefined): ReadonlyArray<FileTextChanges>;
+        getEmitOutput(fileName: string, emitOnlyDtsFiles?: boolean): EmitOutput;
+        getProgram(): Program | undefined;
+        getNonBoundSourceFile(fileName: string): SourceFile;
+        dispose(): void;
+    }
+    interface JsxClosingTagInfo {
+        readonly newText: string;
+    }
+    interface CombinedCodeFixScope {
+        type: "file";
+        fileName: string;
+    }
+    type OrganizeImportsScope = CombinedCodeFixScope;
+    type CompletionsTriggerCharacter = "." | '"' | "'" | "`" | "/" | "@" | "<";
+    interface GetCompletionsAtPositionOptions extends UserPreferences {
+        /** If the editor is asking for completions because a certain character was typed, and not because the user explicitly requested them, this should be set. */
+        triggerCharacter?: CompletionsTriggerCharacter;
+        /** @deprecated Use includeCompletionsForModuleExports */
+        includeExternalModuleExports?: boolean;
+        /** @deprecated Use includeCompletionsWithInsertText */
+        includeInsertTextCompletions?: boolean;
+    }
+    interface ApplyCodeActionCommandResult {
+        successMessage: string;
+    }
+    interface Classifications {
+        spans: number[];
+        endOfLineState: EndOfLineState;
+    }
+    interface ClassifiedSpan {
+        textSpan: TextSpan;
+        classificationType: ClassificationTypeNames;
+    }
+    /**
+     * Navigation bar interface designed for visual studio's dual-column layout.
+     * This does not form a proper tree.
+     * The navbar is returned as a list of top-level items, each of which has a list of child items.
+     * Child items always have an empty array for their `childItems`.
+     */
+    interface NavigationBarItem {
+        text: string;
+        kind: ScriptElementKind;
+        kindModifiers: string;
+        spans: TextSpan[];
+        childItems: NavigationBarItem[];
+        indent: number;
+        bolded: boolean;
+        grayed: boolean;
+    }
+    /**
+     * Node in a tree of nested declarations in a file.
+     * The top node is always a script or module node.
+     */
+    interface NavigationTree {
+        /** Name of the declaration, or a short description, e.g. "<class>". */
+        text: string;
+        kind: ScriptElementKind;
+        /** ScriptElementKindModifier separated by commas, e.g. "public,abstract" */
+        kindModifiers: string;
+        /**
+         * Spans of the nodes that generated this declaration.
+         * There will be more than one if this is the result of merging.
+         */
+        spans: TextSpan[];
+        nameSpan: TextSpan | undefined;
+        /** Present if non-empty */
+        childItems?: NavigationTree[];
+    }
+    interface TodoCommentDescriptor {
+        text: string;
+        priority: number;
+    }
+    interface TodoComment {
+        descriptor: TodoCommentDescriptor;
+        message: string;
+        position: number;
+    }
+    class TextChange {
+        span: TextSpan;
+        newText: string;
+    }
+    interface FileTextChanges {
+        fileName: string;
+        textChanges: TextChange[];
+        isNewFile?: boolean;
+    }
+    interface CodeAction {
+        /** Description of the code action to display in the UI of the editor */
+        description: string;
+        /** Text changes to apply to each file as part of the code action */
+        changes: FileTextChanges[];
+        /**
+         * If the user accepts the code fix, the editor should send the action back in a `applyAction` request.
+         * This allows the language service to have side effects (e.g. installing dependencies) upon a code fix.
+         */
+        commands?: CodeActionCommand[];
+    }
+    interface CodeFixAction extends CodeAction {
+        /** Short name to identify the fix, for use by telemetry. */
+        fixName: string;
+        /**
+         * If present, one may call 'getCombinedCodeFix' with this fixId.
+         * This may be omitted to indicate that the code fix can't be applied in a group.
+         */
+        fixId?: {};
+        fixAllDescription?: string;
+    }
+    interface CombinedCodeActions {
+        changes: ReadonlyArray<FileTextChanges>;
+        commands?: ReadonlyArray<CodeActionCommand>;
+    }
+    type CodeActionCommand = InstallPackageAction;
+    interface InstallPackageAction {
+        file: string;
+        type: "install package";
+        packageName: string;
+    }
+    /**
+     * A set of one or more available refactoring actions, grouped under a parent refactoring.
+     */
+    interface ApplicableRefactorInfo {
+        /**
+         * The programmatic name of the refactoring
+         */
+        name: string;
+        /**
+         * A description of this refactoring category to show to the user.
+         * If the refactoring gets inlined (see below), this text will not be visible.
+         */
+        description: string;
+        /**
+         * Inlineable refactorings can have their actions hoisted out to the top level
+         * of a context menu. Non-inlineanable refactorings should always be shown inside
+         * their parent grouping.
+         *
+         * If not specified, this value is assumed to be 'true'
+         */
+        inlineable?: boolean;
+        actions: RefactorActionInfo[];
+    }
+    /**
+     * Represents a single refactoring action - for example, the "Extract Method..." refactor might
+     * offer several actions, each corresponding to a surround class or closure to extract into.
+     */
+    interface RefactorActionInfo {
+        /**
+         * The programmatic name of the refactoring action
+         */
+        name: string;
+        /**
+         * A description of this refactoring action to show to the user.
+         * If the parent refactoring is inlined away, this will be the only text shown,
+         * so this description should make sense by itself if the parent is inlineable=true
+         */
+        description: string;
+    }
+    /**
+     * A set of edits to make in response to a refactor action, plus an optional
+     * location where renaming should be invoked from
+     */
+    interface RefactorEditInfo {
+        edits: FileTextChanges[];
+        renameFilename?: string;
+        renameLocation?: number;
+        commands?: CodeActionCommand[];
+    }
+    interface TextInsertion {
+        newText: string;
+        /** The position in newText the caret should point to after the insertion. */
+        caretOffset: number;
+    }
+    interface DocumentSpan {
+        textSpan: TextSpan;
+        fileName: string;
+        /**
+         * If the span represents a location that was remapped (e.g. via a .d.ts.map file),
+         * then the original filename and span will be specified here
+         */
+        originalTextSpan?: TextSpan;
+        originalFileName?: string;
+    }
+    interface RenameLocation extends DocumentSpan {
+    }
+    interface ReferenceEntry extends DocumentSpan {
+        isWriteAccess: boolean;
+        isDefinition: boolean;
+        isInString?: true;
+    }
+    interface ImplementationLocation extends DocumentSpan {
+        kind: ScriptElementKind;
+        displayParts: SymbolDisplayPart[];
+    }
+    interface DocumentHighlights {
+        fileName: string;
+        highlightSpans: HighlightSpan[];
+    }
+    enum HighlightSpanKind {
+        none = "none",
+        definition = "definition",
+        reference = "reference",
+        writtenReference = "writtenReference"
+    }
+    interface HighlightSpan {
+        fileName?: string;
+        isInString?: true;
+        textSpan: TextSpan;
+        kind: HighlightSpanKind;
+    }
+    interface NavigateToItem {
+        name: string;
+        kind: ScriptElementKind;
+        kindModifiers: string;
+        matchKind: string;
+        isCaseSensitive: boolean;
+        fileName: string;
+        textSpan: TextSpan;
+        containerName: string;
+        containerKind: ScriptElementKind;
+    }
+    enum IndentStyle {
+        None = 0,
+        Block = 1,
+        Smart = 2
+    }
+    interface EditorOptions {
+        BaseIndentSize?: number;
+        IndentSize: number;
+        TabSize: number;
+        NewLineCharacter: string;
+        ConvertTabsToSpaces: boolean;
+        IndentStyle: IndentStyle;
+    }
+    interface EditorSettings {
+        baseIndentSize?: number;
+        indentSize?: number;
+        tabSize?: number;
+        newLineCharacter?: string;
+        convertTabsToSpaces?: boolean;
+        indentStyle?: IndentStyle;
+    }
+    interface FormatCodeOptions extends EditorOptions {
+        InsertSpaceAfterCommaDelimiter: boolean;
+        InsertSpaceAfterSemicolonInForStatements: boolean;
+        InsertSpaceBeforeAndAfterBinaryOperators: boolean;
+        InsertSpaceAfterConstructor?: boolean;
+        InsertSpaceAfterKeywordsInControlFlowStatements: boolean;
+        InsertSpaceAfterFunctionKeywordForAnonymousFunctions: boolean;
+        InsertSpaceAfterOpeningAndBeforeClosingNonemptyParenthesis: boolean;
+        InsertSpaceAfterOpeningAndBeforeClosingNonemptyBrackets: boolean;
+        InsertSpaceAfterOpeningAndBeforeClosingNonemptyBraces?: boolean;
+        InsertSpaceAfterOpeningAndBeforeClosingTemplateStringBraces: boolean;
+        InsertSpaceAfterOpeningAndBeforeClosingJsxExpressionBraces?: boolean;
+        InsertSpaceAfterTypeAssertion?: boolean;
+        InsertSpaceBeforeFunctionParenthesis?: boolean;
+        PlaceOpenBraceOnNewLineForFunctions: boolean;
+        PlaceOpenBraceOnNewLineForControlBlocks: boolean;
+        insertSpaceBeforeTypeAnnotation?: boolean;
+    }
+    interface FormatCodeSettings extends EditorSettings {
+        insertSpaceAfterCommaDelimiter?: boolean;
+        insertSpaceAfterSemicolonInForStatements?: boolean;
+        insertSpaceBeforeAndAfterBinaryOperators?: boolean;
+        insertSpaceAfterConstructor?: boolean;
+        insertSpaceAfterKeywordsInControlFlowStatements?: boolean;
+        insertSpaceAfterFunctionKeywordForAnonymousFunctions?: boolean;
+        insertSpaceAfterOpeningAndBeforeClosingNonemptyParenthesis?: boolean;
+        insertSpaceAfterOpeningAndBeforeClosingNonemptyBrackets?: boolean;
+        insertSpaceAfterOpeningAndBeforeClosingNonemptyBraces?: boolean;
+        insertSpaceAfterOpeningAndBeforeClosingTemplateStringBraces?: boolean;
+        insertSpaceAfterOpeningAndBeforeClosingJsxExpressionBraces?: boolean;
+        insertSpaceAfterTypeAssertion?: boolean;
+        insertSpaceBeforeFunctionParenthesis?: boolean;
+        placeOpenBraceOnNewLineForFunctions?: boolean;
+        placeOpenBraceOnNewLineForControlBlocks?: boolean;
+        insertSpaceBeforeTypeAnnotation?: boolean;
+        indentMultiLineObjectLiteralBeginningOnBlankLine?: boolean;
+    }
+    interface DefinitionInfo extends DocumentSpan {
+        kind: ScriptElementKind;
+        name: string;
+        containerKind: ScriptElementKind;
+        containerName: string;
+    }
+    interface DefinitionInfoAndBoundSpan {
+        definitions?: ReadonlyArray<DefinitionInfo>;
+        textSpan: TextSpan;
+    }
+    interface ReferencedSymbolDefinitionInfo extends DefinitionInfo {
+        displayParts: SymbolDisplayPart[];
+    }
+    interface ReferencedSymbol {
+        definition: ReferencedSymbolDefinitionInfo;
+        references: ReferenceEntry[];
+    }
+    enum SymbolDisplayPartKind {
+        aliasName = 0,
+        className = 1,
+        enumName = 2,
+        fieldName = 3,
+        interfaceName = 4,
+        keyword = 5,
+        lineBreak = 6,
+        numericLiteral = 7,
+        stringLiteral = 8,
+        localName = 9,
+        methodName = 10,
+        moduleName = 11,
+        operator = 12,
+        parameterName = 13,
+        propertyName = 14,
+        punctuation = 15,
+        space = 16,
+        text = 17,
+        typeParameterName = 18,
+        enumMemberName = 19,
+        functionName = 20,
+        regularExpressionLiteral = 21
+    }
+    interface SymbolDisplayPart {
+        text: string;
+        kind: string;
+    }
+    interface JSDocTagInfo {
+        name: string;
+        text?: string;
+    }
+    interface QuickInfo {
+        kind: ScriptElementKind;
+        kindModifiers: string;
+        textSpan: TextSpan;
+        displayParts?: SymbolDisplayPart[];
+        documentation?: SymbolDisplayPart[];
+        tags?: JSDocTagInfo[];
+    }
+    interface RenameInfo {
+        canRename: boolean;
+        localizedErrorMessage?: string;
+        displayName: string;
+        fullDisplayName: string;
+        kind: ScriptElementKind;
+        kindModifiers: string;
+        triggerSpan: TextSpan;
+    }
+    interface SignatureHelpParameter {
+        name: string;
+        documentation: SymbolDisplayPart[];
+        displayParts: SymbolDisplayPart[];
+        isOptional: boolean;
+    }
+    /**
+     * Represents a single signature to show in signature help.
+     * The id is used for subsequent calls into the language service to ask questions about the
+     * signature help item in the context of any documents that have been updated.  i.e. after
+     * an edit has happened, while signature help is still active, the host can ask important
+     * questions like 'what parameter is the user currently contained within?'.
+     */
+    interface SignatureHelpItem {
+        isVariadic: boolean;
+        prefixDisplayParts: SymbolDisplayPart[];
+        suffixDisplayParts: SymbolDisplayPart[];
+        separatorDisplayParts: SymbolDisplayPart[];
+        parameters: SignatureHelpParameter[];
+        documentation: SymbolDisplayPart[];
+        tags: JSDocTagInfo[];
+    }
+    /**
+     * Represents a set of signature help items, and the preferred item that should be selected.
+     */
+    interface SignatureHelpItems {
+        items: SignatureHelpItem[];
+        applicableSpan: TextSpan;
+        selectedItemIndex: number;
+        argumentIndex: number;
+        argumentCount: number;
+    }
+    interface CompletionInfo {
+        /** Not true for all glboal completions. This will be true if the enclosing scope matches a few syntax kinds. See `isSnippetScope`. */
+        isGlobalCompletion: boolean;
+        isMemberCompletion: boolean;
+        /**
+         * true when the current location also allows for a new identifier
+         */
+        isNewIdentifierLocation: boolean;
+        entries: CompletionEntry[];
+    }
+    interface CompletionEntry {
+        name: string;
+        kind: ScriptElementKind;
+        kindModifiers?: string;
+        sortText: string;
+        insertText?: string;
+        /**
+         * An optional span that indicates the text to be replaced by this completion item.
+         * If present, this span should be used instead of the default one.
+         * It will be set if the required span differs from the one generated by the default replacement behavior.
+         */
+        replacementSpan?: TextSpan;
+        hasAction?: true;
+        source?: string;
+        isRecommended?: true;
+    }
+    interface CompletionEntryDetails {
+        name: string;
+        kind: ScriptElementKind;
+        kindModifiers: string;
+        displayParts: SymbolDisplayPart[];
+        documentation?: SymbolDisplayPart[];
+        tags?: JSDocTagInfo[];
+        codeActions?: CodeAction[];
+        source?: SymbolDisplayPart[];
+    }
+    interface OutliningSpan {
+        /** The span of the document to actually collapse. */
+        textSpan: TextSpan;
+        /** The span of the document to display when the user hovers over the collapsed span. */
+        hintSpan: TextSpan;
+        /** The text to display in the editor for the collapsed region. */
+        bannerText: string;
+        /**
+         * Whether or not this region should be automatically collapsed when
+         * the 'Collapse to Definitions' command is invoked.
+         */
+        autoCollapse: boolean;
+        /**
+         * Classification of the contents of the span
+         */
+        kind: OutliningSpanKind;
+    }
+    enum OutliningSpanKind {
+        /** Single or multi-line comments */
+        Comment = "comment",
+        /** Sections marked by '// #region' and '// #endregion' comments */
+        Region = "region",
+        /** Declarations and expressions */
+        Code = "code",
+        /** Contiguous blocks of import declarations */
+        Imports = "imports"
+    }
+    enum OutputFileType {
+        JavaScript = 0,
+        SourceMap = 1,
+        Declaration = 2
+    }
+    enum EndOfLineState {
+        None = 0,
+        InMultiLineCommentTrivia = 1,
+        InSingleQuoteStringLiteral = 2,
+        InDoubleQuoteStringLiteral = 3,
+        InTemplateHeadOrNoSubstitutionTemplate = 4,
+        InTemplateMiddleOrTail = 5,
+        InTemplateSubstitutionPosition = 6
+    }
+    enum TokenClass {
+        Punctuation = 0,
+        Keyword = 1,
+        Operator = 2,
+        Comment = 3,
+        Whitespace = 4,
+        Identifier = 5,
+        NumberLiteral = 6,
+        StringLiteral = 7,
+        RegExpLiteral = 8
+    }
+    interface ClassificationResult {
+        finalLexState: EndOfLineState;
+        entries: ClassificationInfo[];
+    }
+    interface ClassificationInfo {
+        length: number;
+        classification: TokenClass;
+    }
+    interface Classifier {
+        /**
+         * Gives lexical classifications of tokens on a line without any syntactic context.
+         * For instance, a token consisting of the text 'string' can be either an identifier
+         * named 'string' or the keyword 'string', however, because this classifier is not aware,
+         * it relies on certain heuristics to give acceptable results. For classifications where
+         * speed trumps accuracy, this function is preferable; however, for true accuracy, the
+         * syntactic classifier is ideal. In fact, in certain editing scenarios, combining the
+         * lexical, syntactic, and semantic classifiers may issue the best user experience.
+         *
+         * @param text                      The text of a line to classify.
+         * @param lexState                  The state of the lexical classifier at the end of the previous line.
+         * @param syntacticClassifierAbsent Whether the client is *not* using a syntactic classifier.
+         *                                  If there is no syntactic classifier (syntacticClassifierAbsent=true),
+         *                                  certain heuristics may be used in its place; however, if there is a
+         *                                  syntactic classifier (syntacticClassifierAbsent=false), certain
+         *                                  classifications which may be incorrectly categorized will be given
+         *                                  back as Identifiers in order to allow the syntactic classifier to
+         *                                  subsume the classification.
+         * @deprecated Use getLexicalClassifications instead.
+         */
+        getClassificationsForLine(text: string, lexState: EndOfLineState, syntacticClassifierAbsent: boolean): ClassificationResult;
+        getEncodedLexicalClassifications(text: string, endOfLineState: EndOfLineState, syntacticClassifierAbsent: boolean): Classifications;
+    }
+    enum ScriptElementKind {
+        unknown = "",
+        warning = "warning",
+        /** predefined type (void) or keyword (class) */
+        keyword = "keyword",
+        /** top level script node */
+        scriptElement = "script",
+        /** module foo {} */
+        moduleElement = "module",
+        /** class X {} */
+        classElement = "class",
+        /** var x = class X {} */
+        localClassElement = "local class",
+        /** interface Y {} */
+        interfaceElement = "interface",
+        /** type T = ... */
+        typeElement = "type",
+        /** enum E */
+        enumElement = "enum",
+        enumMemberElement = "enum member",
+        /**
+         * Inside module and script only
+         * const v = ..
+         */
+        variableElement = "var",
+        /** Inside function */
+        localVariableElement = "local var",
+        /**
+         * Inside module and script only
+         * function f() { }
+         */
+        functionElement = "function",
+        /** Inside function */
+        localFunctionElement = "local function",
+        /** class X { [public|private]* foo() {} } */
+        memberFunctionElement = "method",
+        /** class X { [public|private]* [get|set] foo:number; } */
+        memberGetAccessorElement = "getter",
+        memberSetAccessorElement = "setter",
+        /**
+         * class X { [public|private]* foo:number; }
+         * interface Y { foo:number; }
+         */
+        memberVariableElement = "property",
+        /** class X { constructor() { } } */
+        constructorImplementationElement = "constructor",
+        /** interface Y { ():number; } */
+        callSignatureElement = "call",
+        /** interface Y { []:number; } */
+        indexSignatureElement = "index",
+        /** interface Y { new():Y; } */
+        constructSignatureElement = "construct",
+        /** function foo(*Y*: string) */
+        parameterElement = "parameter",
+        typeParameterElement = "type parameter",
+        primitiveType = "primitive type",
+        label = "label",
+        alias = "alias",
+        constElement = "const",
+        letElement = "let",
+        directory = "directory",
+        externalModuleName = "external module name",
+        /**
+         * <JsxTagName attribute1 attribute2={0} />
+         */
+        jsxAttribute = "JSX attribute",
+        /** String literal */
+        string = "string"
+    }
+    enum ScriptElementKindModifier {
+        none = "",
+        publicMemberModifier = "public",
+        privateMemberModifier = "private",
+        protectedMemberModifier = "protected",
+        exportedModifier = "export",
+        ambientModifier = "declare",
+        staticModifier = "static",
+        abstractModifier = "abstract",
+        optionalModifier = "optional"
+    }
+    enum ClassificationTypeNames {
+        comment = "comment",
+        identifier = "identifier",
+        keyword = "keyword",
+        numericLiteral = "number",
+        operator = "operator",
+        stringLiteral = "string",
+        whiteSpace = "whitespace",
+        text = "text",
+        punctuation = "punctuation",
+        className = "class name",
+        enumName = "enum name",
+        interfaceName = "interface name",
+        moduleName = "module name",
+        typeParameterName = "type parameter name",
+        typeAliasName = "type alias name",
+        parameterName = "parameter name",
+        docCommentTagName = "doc comment tag name",
+        jsxOpenTagName = "jsx open tag name",
+        jsxCloseTagName = "jsx close tag name",
+        jsxSelfClosingTagName = "jsx self closing tag name",
+        jsxAttribute = "jsx attribute",
+        jsxText = "jsx text",
+        jsxAttributeStringLiteralValue = "jsx attribute string literal value"
+    }
+    enum ClassificationType {
+        comment = 1,
+        identifier = 2,
+        keyword = 3,
+        numericLiteral = 4,
+        operator = 5,
+        stringLiteral = 6,
+        regularExpressionLiteral = 7,
+        whiteSpace = 8,
+        text = 9,
+        punctuation = 10,
+        className = 11,
+        enumName = 12,
+        interfaceName = 13,
+        moduleName = 14,
+        typeParameterName = 15,
+        typeAliasName = 16,
+        parameterName = 17,
+        docCommentTagName = 18,
+        jsxOpenTagName = 19,
+        jsxCloseTagName = 20,
+        jsxSelfClosingTagName = 21,
+        jsxAttribute = 22,
+        jsxText = 23,
+        jsxAttributeStringLiteralValue = 24
+    }
+}
+interface PromiseConstructor {
+    new <T>(executor: (resolve: (value?: T | PromiseLike<T>) => void, reject: (reason?: any) => void) => void): Promise<T>;
+    reject(reason: any): Promise<never>;
+    all<T>(values: (T | PromiseLike<T>)[]): Promise<T[]>;
+}
+declare var Promise: PromiseConstructor;
+declare namespace ts {
+    const scanner: Scanner;
+    enum SemanticMeaning {
+        None = 0,
+        Value = 1,
+        Type = 2,
+        Namespace = 4,
+        All = 7
+    }
+    function getMeaningFromDeclaration(node: Node): SemanticMeaning;
+    function getMeaningFromLocation(node: Node): SemanticMeaning;
+    function isInRightSideOfInternalImportEqualsDeclaration(node: Node): boolean;
+    function isCallExpressionTarget(node: Node): boolean;
+    function isNewExpressionTarget(node: Node): boolean;
+    function climbPastPropertyAccess(node: Node): Node;
+    function getTargetLabel(referenceNode: Node, labelName: string): Identifier | undefined;
+    function isJumpStatementTarget(node: Node): node is Identifier & {
+        parent: BreakOrContinueStatement;
+    };
+    function isLabelOfLabeledStatement(node: Node): node is Identifier;
+    function isLabelName(node: Node): boolean;
+    function isRightSideOfQualifiedName(node: Node): boolean;
+    function isRightSideOfPropertyAccess(node: Node): boolean;
+    function isNameOfModuleDeclaration(node: Node): boolean;
+    function isNameOfFunctionDeclaration(node: Node): boolean;
+    function isLiteralNameOfPropertyDeclarationOrIndexAccess(node: StringLiteral | NumericLiteral): boolean;
+    function isExpressionOfExternalModuleImportEqualsDeclaration(node: Node): boolean;
+    function getContainerNode(node: Node): Declaration | undefined;
+    function getNodeKind(node: Node): ScriptElementKind;
+    function isThis(node: Node): boolean;
+    interface ListItemInfo {
+        listItemIndex: number;
+        list: Node;
+    }
+    function getLineStartPositionForPosition(position: number, sourceFile: SourceFileLike): number;
+    function rangeContainsRange(r1: TextRange, r2: TextRange): boolean;
+    function rangeContainsPosition(r: TextRange, pos: number): boolean;
+    function rangeContainsPositionExclusive(r: TextRange, pos: number): boolean;
+    function startEndContainsRange(start: number, end: number, range: TextRange): boolean;
+    function rangeContainsStartEnd(range: TextRange, start: number, end: number): boolean;
+    function rangeOverlapsWithStartEnd(r1: TextRange, start: number, end: number): boolean;
+    function startEndOverlapsWithStartEnd(start1: number, end1: number, start2: number, end2: number): boolean;
+    /**
+     * Assumes `candidate.start <= position` holds.
+     */
+    function positionBelongsToNode(candidate: Node, position: number, sourceFile: SourceFile): boolean;
+    function findListItemInfo(node: Node): ListItemInfo | undefined;
+    function hasChildOfKind(n: Node, kind: SyntaxKind, sourceFile: SourceFile): boolean;
+    function findChildOfKind<T extends Node>(n: Node, kind: T["kind"], sourceFile: SourceFileLike): T | undefined;
+    function findContainingList(node: Node): SyntaxList | undefined;
+    /**
+     * Gets the token whose text has range [start, end) and
+     * position >= start and (position < end or (position === end && token is literal or keyword or identifier))
+     */
+    function getTouchingPropertyName(sourceFile: SourceFile, position: number): Node;
+    /**
+     * Returns the token if position is in [start, end).
+     * If position === end, returns the preceding token if includeItemAtEndPosition(previousToken) === true
+     */
+    function getTouchingToken(sourceFile: SourceFile, position: number, includeJsDocComment: boolean, includePrecedingTokenAtEndPosition?: (n: Node) => boolean): Node;
+    /** Returns a token if position is in [start-of-leading-trivia, end) */
+    function getTokenAtPosition(sourceFile: SourceFile, position: number, includeJsDocComment: boolean, includeEndPosition?: boolean): Node;
+    /**
+     * The token on the left of the position is the token that strictly includes the position
+     * or sits to the left of the cursor if it is on a boundary. For example
+     *
+     *   fo|o               -> will return foo
+     *   foo <comment> |bar -> will return foo
+     *
+     */
+    function findTokenOnLeftOfPosition(file: SourceFile, position: number): Node | undefined;
+    function findNextToken(previousToken: Node, parent: Node, sourceFile: SourceFile): Node | undefined;
+    /**
+     * Finds the rightmost token satisfying `token.end <= position`,
+     * excluding `JsxText` tokens containing only whitespace.
+     */
+    function findPrecedingToken(position: number, sourceFile: SourceFile, startNode?: Node, includeJsDoc?: boolean): Node | undefined;
+    function isInString(sourceFile: SourceFile, position: number, previousToken?: Node | undefined): boolean;
+    /**
+     * returns true if the position is in between the open and close elements of an JSX expression.
+     */
+    function isInsideJsxElementOrAttribute(sourceFile: SourceFile, position: number): boolean;
+    function isInTemplateString(sourceFile: SourceFile, position: number): boolean;
+    function findPrecedingMatchingToken(token: Node, matchingTokenKind: SyntaxKind, sourceFile: SourceFile): Node | undefined;
+    interface PossibleTypeArgumentInfo {
+        readonly called: Identifier;
+        readonly nTypeArguments: number;
+    }
+    function isPossiblyTypeArgumentPosition(tokenIn: Node, sourceFile: SourceFile): PossibleTypeArgumentInfo | undefined;
+    /**
+     * Returns true if the cursor at position in sourceFile is within a comment.
+     *
+     * @param tokenAtPosition Must equal `getTokenAtPosition(sourceFile, position)
+     * @param predicate Additional predicate to test on the comment range.
+     */
+    function isInComment(sourceFile: SourceFile, position: number, tokenAtPosition?: Node, predicate?: (c: CommentRange) => boolean): boolean;
+    function hasDocComment(sourceFile: SourceFile, position: number): boolean | undefined;
+    function getNodeModifiers(node: Node): string;
+    function getTypeArgumentOrTypeParameterList(node: Node): NodeArray<Node> | undefined;
+    function isComment(kind: SyntaxKind): boolean;
+    function isStringOrRegularExpressionOrTemplateLiteral(kind: SyntaxKind): boolean;
+    function isPunctuation(kind: SyntaxKind): boolean;
+    function isInsideTemplateLiteral(node: TemplateLiteralToken, position: number, sourceFile: SourceFile): boolean;
+    function isAccessibilityModifier(kind: SyntaxKind): boolean;
+    function cloneCompilerOptions(options: CompilerOptions): CompilerOptions;
+    function isArrayLiteralOrObjectLiteralDestructuringPattern(node: Node): boolean;
+    function isInReferenceComment(sourceFile: SourceFile, position: number): boolean;
+    function isInNonReferenceComment(sourceFile: SourceFile, position: number): boolean;
+    function createTextSpanFromNode(node: Node, sourceFile?: SourceFile): TextSpan;
+    function createTextSpanFromRange(range: TextRange): TextSpan;
+    function createTextRangeFromSpan(span: TextSpan): TextRange;
+    function createTextChangeFromStartLength(start: number, length: number, newText: string): TextChange;
+    function createTextChange(span: TextSpan, newText: string): TextChange;
+    const typeKeywords: ReadonlyArray<SyntaxKind>;
+    function isTypeKeyword(kind: SyntaxKind): boolean;
+    /** True if the symbol is for an external module, as opposed to a namespace. */
+    function isExternalModuleSymbol(moduleSymbol: Symbol): boolean;
+    /** Returns `true` the first time it encounters a node and `false` afterwards. */
+    type NodeSeenTracker<T = Node> = (node: T) => boolean;
+    function nodeSeenTracker<T extends Node>(): NodeSeenTracker<T>;
+    function getSnapshotText(snap: IScriptSnapshot): string;
+    function repeatString(str: string, count: number): string;
+    function skipConstraint(type: Type): Type;
+    function getNameFromPropertyName(name: PropertyName): string | undefined;
+    function programContainsEs6Modules(program: Program): boolean;
+    function compilerOptionsIndicateEs6Modules(compilerOptions: CompilerOptions): boolean;
+    function hostUsesCaseSensitiveFileNames(host: LanguageServiceHost): boolean;
+    function hostGetCanonicalFileName(host: LanguageServiceHost): GetCanonicalFileName;
+    function makeImportIfNecessary(defaultImport: Identifier | undefined, namedImports: ReadonlyArray<ImportSpecifier> | undefined, moduleSpecifier: string, quotePreference: QuotePreference): ImportDeclaration | undefined;
+    function makeImport(defaultImport: Identifier | undefined, namedImports: ReadonlyArray<ImportSpecifier> | undefined, moduleSpecifier: string | Expression, quotePreference: QuotePreference): ImportDeclaration;
+    function makeStringLiteral(text: string, quotePreference: QuotePreference): StringLiteral;
+    enum QuotePreference {
+        Single = 0,
+        Double = 1
+    }
+    function getQuotePreference(sourceFile: SourceFile, preferences: UserPreferences): QuotePreference;
+    function symbolNameNoDefault(symbol: Symbol): string | undefined;
+    function symbolEscapedNameNoDefault(symbol: Symbol): __String | undefined;
+    function getPropertySymbolFromBindingElement(checker: TypeChecker, bindingElement: BindingElement & {
+        name: Identifier;
+    }): Symbol | undefined;
+    /**
+     * Find symbol of the given property-name and add the symbol to the given result array
+     * @param symbol a symbol to start searching for the given propertyName
+     * @param propertyName a name of property to search for
+     * @param result an array of symbol of found property symbols
+     * @param previousIterationSymbolsCache a cache of symbol from previous iterations of calling this function to prevent infinite revisiting of the same symbol.
+     *                                The value of previousIterationSymbol is undefined when the function is first called.
+     */
+    function getPropertySymbolsFromBaseTypes<T>(symbol: Symbol, propertyName: string, checker: TypeChecker, cb: (symbol: Symbol) => T | undefined): T | undefined;
+    function isMemberSymbolInBaseType(memberSymbol: Symbol, checker: TypeChecker): boolean;
+    class NodeSet {
+        private map;
+        add(node: Node): void;
+        has(node: Node): boolean;
+        forEach(cb: (node: Node) => void): void;
+        some(pred: (node: Node) => boolean): boolean;
+    }
+    function getParentNodeInSpan(node: Node | undefined, file: SourceFile, span: TextSpan): Node | undefined;
+}
+declare namespace ts {
+    function isFirstDeclarationOfSymbolParameter(symbol: Symbol): boolean;
+    function symbolPart(text: string, symbol: Symbol): SymbolDisplayPart;
+    function displayPart(text: string, kind: SymbolDisplayPartKind): SymbolDisplayPart;
+    function spacePart(): SymbolDisplayPart;
+    function keywordPart(kind: SyntaxKind): SymbolDisplayPart;
+    function punctuationPart(kind: SyntaxKind): SymbolDisplayPart;
+    function operatorPart(kind: SyntaxKind): SymbolDisplayPart;
+    function textOrKeywordPart(text: string): SymbolDisplayPart;
+    function textPart(text: string): SymbolDisplayPart;
+    /**
+     * The default is CRLF.
+     */
+    function getNewLineOrDefaultFromHost(host: LanguageServiceHost | LanguageServiceShimHost, formatSettings?: FormatCodeSettings): string;
+    function lineBreakPart(): SymbolDisplayPart;
+    function mapToDisplayParts(writeDisplayParts: (writer: DisplayPartsSymbolWriter) => void): SymbolDisplayPart[];
+    function typeToDisplayParts(typechecker: TypeChecker, type: Type, enclosingDeclaration?: Node, flags?: TypeFormatFlags): SymbolDisplayPart[];
+    function symbolToDisplayParts(typeChecker: TypeChecker, symbol: Symbol, enclosingDeclaration?: Node, meaning?: SymbolFlags, flags?: SymbolFormatFlags): SymbolDisplayPart[];
+    function signatureToDisplayParts(typechecker: TypeChecker, signature: Signature, enclosingDeclaration?: Node, flags?: TypeFormatFlags): SymbolDisplayPart[];
+    function isImportOrExportSpecifierName(location: Node): location is Identifier;
+    /**
+     * Strip off existed single quotes or double quotes from a given string
+     *
+     * @return non-quoted string
+     */
+    function stripQuotes(name: string): string;
+    function startsWithQuote(name: string): boolean;
+    function scriptKindIs(fileName: string, host: LanguageServiceHost, ...scriptKinds: ScriptKind[]): boolean;
+    function getScriptKind(fileName: string, host?: LanguageServiceHost): ScriptKind;
+    function getUniqueSymbolId(symbol: Symbol, checker: TypeChecker): number;
+    function getFirstNonSpaceCharacterPosition(text: string, position: number): number;
+    /**
+     * Creates a deep, memberwise clone of a node with no source map location.
+     *
+     * WARNING: This is an expensive operation and is only intended to be used in refactorings
+     * and code fixes (because those are triggered by explicit user actions).
+     */
+    function getSynthesizedDeepClone<T extends Node | undefined>(node: T, includeTrivia?: boolean): T;
+    function getSynthesizedDeepClones<T extends Node>(nodes: NodeArray<T>, includeTrivia?: boolean): NodeArray<T>;
+    function getSynthesizedDeepClones<T extends Node>(nodes: NodeArray<T> | undefined, includeTrivia?: boolean): NodeArray<T> | undefined;
+    /**
+     * Sets EmitFlags to suppress leading and trailing trivia on the node.
+     */
+    function suppressLeadingAndTrailingTrivia(node: Node): void;
+    /**
+     * Sets EmitFlags to suppress leading trivia on the node.
+     */
+    function suppressLeadingTrivia(node: Node): void;
+    /**
+     * Sets EmitFlags to suppress trailing trivia on the node.
+     */
+    function suppressTrailingTrivia(node: Node): void;
+    function getUniqueName(baseName: string, sourceFile: SourceFile): string;
+    /**
+     * @return The index of the (only) reference to the extracted symbol.  We want the cursor
+     * to be on the reference, rather than the declaration, because it's closer to where the
+     * user was before extracting it.
+     */
+    function getRenameLocation(edits: ReadonlyArray<FileTextChanges>, renameFilename: string, name: string, preferLastLocation: boolean): number;
+}
+declare namespace ts {
+    function createClassifier(): Classifier;
+    function getSemanticClassifications(typeChecker: TypeChecker, cancellationToken: CancellationToken, sourceFile: SourceFile, classifiableNames: UnderscoreEscapedMap<true>, span: TextSpan): ClassifiedSpan[];
+    function getEncodedSemanticClassifications(typeChecker: TypeChecker, cancellationToken: CancellationToken, sourceFile: SourceFile, classifiableNames: UnderscoreEscapedMap<true>, span: TextSpan): Classifications;
+    function getSyntacticClassifications(cancellationToken: CancellationToken, sourceFile: SourceFile, span: TextSpan): ClassifiedSpan[];
+    function getEncodedSyntacticClassifications(cancellationToken: CancellationToken, sourceFile: SourceFile, span: TextSpan): Classifications;
+}
+declare namespace ts.Completions.PathCompletions {
+    interface NameAndKind {
+        readonly name: string;
+        readonly kind: ScriptElementKind.scriptElement | ScriptElementKind.directory | ScriptElementKind.externalModuleName;
+    }
+    interface PathCompletion extends NameAndKind {
+        readonly span: TextSpan | undefined;
+    }
+    function getStringLiteralCompletionsFromModuleNames(sourceFile: SourceFile, node: LiteralExpression, compilerOptions: CompilerOptions, host: LanguageServiceHost, typeChecker: TypeChecker): ReadonlyArray<PathCompletion>;
+    function getTripleSlashReferenceCompletion(sourceFile: SourceFile, position: number, compilerOptions: CompilerOptions, host: LanguageServiceHost): ReadonlyArray<PathCompletion> | undefined;
+}
+declare namespace ts.Completions {
+    type Log = (message: string) => void;
+    function getCompletionsAtPosition(host: LanguageServiceHost, program: Program, log: Log, sourceFile: SourceFile, position: number, preferences: UserPreferences, triggerCharacter: CompletionsTriggerCharacter | undefined): CompletionInfo | undefined;
+    interface CompletionEntryIdentifier {
+        name: string;
+        source?: string;
+    }
+    function getCompletionEntryDetails(program: Program, log: Log, sourceFile: SourceFile, position: number, entryId: CompletionEntryIdentifier, host: LanguageServiceHost, formatContext: formatting.FormatContext, getCanonicalFileName: GetCanonicalFileName, preferences: UserPreferences, cancellationToken: CancellationToken): CompletionEntryDetails | undefined;
+    function getCompletionEntrySymbol(program: Program, log: Log, sourceFile: SourceFile, position: number, entryId: CompletionEntryIdentifier): Symbol | undefined;
+}
+declare namespace ts.DocumentHighlights {
+    function getDocumentHighlights(program: Program, cancellationToken: CancellationToken, sourceFile: SourceFile, position: number, sourceFilesToSearch: ReadonlyArray<SourceFile>): DocumentHighlights[] | undefined;
+}
+declare namespace ts {
+    /**
+     * The document registry represents a store of SourceFile objects that can be shared between
+     * multiple LanguageService instances. A LanguageService instance holds on the SourceFile (AST)
+     * of files in the context.
+     * SourceFile objects account for most of the memory usage by the language service. Sharing
+     * the same DocumentRegistry instance between different instances of LanguageService allow
+     * for more efficient memory utilization since all projects will share at least the library
+     * file (lib.d.ts).
+     *
+     * A more advanced use of the document registry is to serialize sourceFile objects to disk
+     * and re-hydrate them when needed.
+     *
+     * To create a default DocumentRegistry, use createDocumentRegistry to create one, and pass it
+     * to all subsequent createLanguageService calls.
+     */
+    interface DocumentRegistry {
+        /**
+         * Request a stored SourceFile with a given fileName and compilationSettings.
+         * The first call to acquire will call createLanguageServiceSourceFile to generate
+         * the SourceFile if was not found in the registry.
+         *
+         * @param fileName The name of the file requested
+         * @param compilationSettings Some compilation settings like target affects the
+         * shape of a the resulting SourceFile. This allows the DocumentRegistry to store
+         * multiple copies of the same file for different compilation settings.
+         * @param scriptSnapshot Text of the file. Only used if the file was not found
+         * in the registry and a new one was created.
+         * @param version Current version of the file. Only used if the file was not found
+         * in the registry and a new one was created.
+         */
+        acquireDocument(fileName: string, compilationSettings: CompilerOptions, scriptSnapshot: IScriptSnapshot, version: string, scriptKind?: ScriptKind): SourceFile;
+        acquireDocumentWithKey(fileName: string, path: Path, compilationSettings: CompilerOptions, key: DocumentRegistryBucketKey, scriptSnapshot: IScriptSnapshot, version: string, scriptKind?: ScriptKind): SourceFile;
+        /**
+         * Request an updated version of an already existing SourceFile with a given fileName
+         * and compilationSettings. The update will in-turn call updateLanguageServiceSourceFile
+         * to get an updated SourceFile.
+         *
+         * @param fileName The name of the file requested
+         * @param compilationSettings Some compilation settings like target affects the
+         * shape of a the resulting SourceFile. This allows the DocumentRegistry to store
+         * multiple copies of the same file for different compilation settings.
+         * @param scriptSnapshot Text of the file.
+         * @param version Current version of the file.
+         */
+        updateDocument(fileName: string, compilationSettings: CompilerOptions, scriptSnapshot: IScriptSnapshot, version: string, scriptKind?: ScriptKind): SourceFile;
+        updateDocumentWithKey(fileName: string, path: Path, compilationSettings: CompilerOptions, key: DocumentRegistryBucketKey, scriptSnapshot: IScriptSnapshot, version: string, scriptKind?: ScriptKind): SourceFile;
+        getKeyForCompilationSettings(settings: CompilerOptions): DocumentRegistryBucketKey;
+        /**
+         * Informs the DocumentRegistry that a file is not needed any longer.
+         *
+         * Note: It is not allowed to call release on a SourceFile that was not acquired from
+         * this registry originally.
+         *
+         * @param fileName The name of the file to be released
+         * @param compilationSettings The compilation settings used to acquire the file
+         */
+        releaseDocument(fileName: string, compilationSettings: CompilerOptions): void;
+        releaseDocumentWithKey(path: Path, key: DocumentRegistryBucketKey): void;
+        getLanguageServiceRefCounts(path: Path): [string, number | undefined][];
+        reportStats(): string;
+    }
+    interface ExternalDocumentCache {
+        setDocument(key: DocumentRegistryBucketKey, path: Path, sourceFile: SourceFile): void;
+        getDocument(key: DocumentRegistryBucketKey, path: Path): SourceFile | undefined;
+    }
+    type DocumentRegistryBucketKey = string & {
+        __bucketKey: any;
+    };
+    function createDocumentRegistry(useCaseSensitiveFileNames?: boolean, currentDirectory?: string): DocumentRegistry;
+    function createDocumentRegistryInternal(useCaseSensitiveFileNames?: boolean, currentDirectory?: string, externalCache?: ExternalDocumentCache): DocumentRegistry;
+}
+declare namespace ts.FindAllReferences {
+    interface ImportsResult {
+        /** For every import of the symbol, the location and local symbol for the import. */
+        importSearches: ReadonlyArray<[Identifier, Symbol]>;
+        /** For rename imports/exports `{ foo as bar }`, `foo` is not a local, so it may be added as a reference immediately without further searching. */
+        singleReferences: ReadonlyArray<Identifier | StringLiteral>;
+        /** List of source files that may (or may not) use the symbol via a namespace. (For UMD modules this is every file.) */
+        indirectUsers: ReadonlyArray<SourceFile>;
+    }
+    type ImportTracker = (exportSymbol: Symbol, exportInfo: ExportInfo, isForRename: boolean) => ImportsResult;
+    /** Creates the imports map and returns an ImportTracker that uses it. Call this lazily to avoid calling `getDirectImportsMap` unnecessarily.  */
+    function createImportTracker(sourceFiles: ReadonlyArray<SourceFile>, sourceFilesSet: ReadonlyMap<true>, checker: TypeChecker, cancellationToken: CancellationToken): ImportTracker;
+    /** Info about an exported symbol to perform recursive search on. */
+    interface ExportInfo {
+        exportingModuleSymbol: Symbol;
+        exportKind: ExportKind;
+    }
+    enum ExportKind {
+        Named = 0,
+        Default = 1,
+        ExportEquals = 2
+    }
+    enum ImportExport {
+        Import = 0,
+        Export = 1
+    }
+    type ModuleReference = {
+        kind: "import";
+        literal: StringLiteralLike;
+    }
+    /** <reference path> or <reference types> */
+     | {
+        kind: "reference";
+        referencingFile: SourceFile;
+        ref: FileReference;
+    };
+    function findModuleReferences(program: Program, sourceFiles: ReadonlyArray<SourceFile>, searchModuleSymbol: Symbol): ModuleReference[];
+    interface ImportedSymbol {
+        kind: ImportExport.Import;
+        symbol: Symbol;
+        isNamedImport: boolean;
+    }
+    interface ExportedSymbol {
+        kind: ImportExport.Export;
+        symbol: Symbol;
+        exportInfo: ExportInfo;
+    }
+    /**
+     * Given a local reference, we might notice that it's an import/export and recursively search for references of that.
+     * If at an import, look locally for the symbol it imports.
+     * If an an export, look for all imports of it.
+     * This doesn't handle export specifiers; that is done in `getReferencesAtExportSpecifier`.
+     * @param comingFromExport If we are doing a search for all exports, don't bother looking backwards for the imported symbol, since that's the reason we're here.
+     */
+    function getImportOrExportSymbol(node: Node, symbol: Symbol, checker: TypeChecker, comingFromExport: boolean): ImportedSymbol | ExportedSymbol | undefined;
+    function getExportInfo(exportSymbol: Symbol, exportKind: ExportKind, checker: TypeChecker): ExportInfo | undefined;
+}
+declare namespace ts.FindAllReferences {
+    interface SymbolAndEntries {
+        definition: Definition | undefined;
+        references: Entry[];
+    }
+    type Definition = {
+        type: "symbol";
+        symbol: Symbol;
+    } | {
+        type: "label";
+        node: Identifier;
+    } | {
+        type: "keyword";
+        node: Node;
+    } | {
+        type: "this";
+        node: Node;
+    } | {
+        type: "string";
+        node: StringLiteral;
+    };
+    type Entry = NodeEntry | SpanEntry;
+    interface NodeEntry {
+        type: "node";
+        node: Node;
+        isInString?: true;
+    }
+    interface SpanEntry {
+        type: "span";
+        fileName: string;
+        textSpan: TextSpan;
+    }
+    function nodeEntry(node: Node, isInString?: true): NodeEntry;
+    interface Options {
+        readonly findInStrings?: boolean;
+        readonly findInComments?: boolean;
+        /**
+         * True if we are renaming the symbol.
+         * If so, we will find fewer references -- if it is referenced by several different names, we sill only find references for the original name.
+         */
+        readonly isForRename?: boolean;
+        /** True if we are searching for implementations. We will have a different method of adding references if so. */
+        readonly implementations?: boolean;
+    }
+    function findReferencedSymbols(program: Program, cancellationToken: CancellationToken, sourceFiles: ReadonlyArray<SourceFile>, sourceFile: SourceFile, position: number): ReferencedSymbol[] | undefined;
+    function getImplementationsAtPosition(program: Program, cancellationToken: CancellationToken, sourceFiles: ReadonlyArray<SourceFile>, sourceFile: SourceFile, position: number): ImplementationLocation[] | undefined;
+    function findReferencedEntries(program: Program, cancellationToken: CancellationToken, sourceFiles: ReadonlyArray<SourceFile>, sourceFile: SourceFile, position: number, options?: Options): ReferenceEntry[] | undefined;
+    function getReferenceEntriesForNode(position: number, node: Node, program: Program, sourceFiles: ReadonlyArray<SourceFile>, cancellationToken: CancellationToken, options?: Options, sourceFilesSet?: ReadonlyMap<true>): Entry[] | undefined;
+    function toHighlightSpan(entry: Entry): {
+        fileName: string;
+        span: HighlightSpan;
+    };
+}
+/** Encapsulates the core find-all-references algorithm. */
+declare namespace ts.FindAllReferences.Core {
+    /** Core find-all-references algorithm. Handles special cases before delegating to `getReferencedSymbolsForSymbol`. */
+    function getReferencedSymbolsForNode(position: number, node: Node, program: Program, sourceFiles: ReadonlyArray<SourceFile>, cancellationToken: CancellationToken, options?: Options, sourceFilesSet?: ReadonlyMap<true>): SymbolAndEntries[] | undefined;
+    /** Used as a quick check for whether a symbol is used at all in a file (besides its definition). */
+    function isSymbolReferencedInFile(definition: Identifier, checker: TypeChecker, sourceFile: SourceFile): boolean;
+    function eachSymbolReferenceInFile<T>(definition: Identifier, checker: TypeChecker, sourceFile: SourceFile, cb: (token: Identifier) => T): T | undefined;
+    /**
+     * Given an initial searchMeaning, extracted from a location, widen the search scope based on the declarations
+     * of the corresponding symbol. e.g. if we are searching for "Foo" in value position, but "Foo" references a class
+     * then we need to widen the search to include type positions as well.
+     * On the contrary, if we are searching for "Bar" in type position and we trace bar to an interface, and an uninstantiated
+     * module, we want to keep the search limited to only types, as the two declarations (interface and uninstantiated module)
+     * do not intersect in any of the three spaces.
+     */
+    function getIntersectingMeaningFromDeclarations(node: Node, symbol: Symbol): SemanticMeaning;
+    function getReferenceEntriesForShorthandPropertyAssignment(node: Node, checker: TypeChecker, addReference: (node: Node) => void): void;
+}
+declare namespace ts {
+    function getEditsForFileRename(program: Program, oldFileOrDirPath: string, newFileOrDirPath: string, host: LanguageServiceHost, formatContext: formatting.FormatContext, preferences: UserPreferences): ReadonlyArray<FileTextChanges>;
+}
+declare namespace ts.GoToDefinition {
+    function getDefinitionAtPosition(program: Program, sourceFile: SourceFile, position: number): DefinitionInfo[] | undefined;
+    function getReferenceAtPosition(sourceFile: SourceFile, position: number, program: Program): {
+        fileName: string;
+        file: SourceFile;
+    } | undefined;
+    function getTypeDefinitionAtPosition(typeChecker: TypeChecker, sourceFile: SourceFile, position: number): DefinitionInfo[] | undefined;
+    function getDefinitionAndBoundSpan(program: Program, sourceFile: SourceFile, position: number): DefinitionInfoAndBoundSpan | undefined;
+    function findReferenceInPosition(refs: ReadonlyArray<FileReference>, pos: number): FileReference | undefined;
+}
+declare namespace ts.JsDoc {
+    function getJsDocCommentsFromDeclarations(declarations: ReadonlyArray<Declaration>): SymbolDisplayPart[];
+    function getJsDocTagsFromDeclarations(declarations?: Declaration[]): JSDocTagInfo[];
+    function getJSDocTagNameCompletions(): CompletionEntry[];
+    const getJSDocTagNameCompletionDetails: typeof getJSDocTagCompletionDetails;
+    function getJSDocTagCompletions(): CompletionEntry[];
+    function getJSDocTagCompletionDetails(name: string): CompletionEntryDetails;
+    function getJSDocParameterNameCompletions(tag: JSDocParameterTag): CompletionEntry[];
+    function getJSDocParameterNameCompletionDetails(name: string): CompletionEntryDetails;
+    /**
+     * Checks if position points to a valid position to add JSDoc comments, and if so,
+     * returns the appropriate template. Otherwise returns an empty string.
+     * Valid positions are
+     *      - outside of comments, statements, and expressions, and
+     *      - preceding a:
+     *          - function/constructor/method declaration
+     *          - class declarations
+     *          - variable statements
+     *          - namespace declarations
+     *          - interface declarations
+     *          - method signatures
+     *          - type alias declarations
+     *
+     * Hosts should ideally check that:
+     * - The line is all whitespace up to 'position' before performing the insertion.
+     * - If the keystroke sequence "/\*\*" induced the call, we also check that the next
+     * non-whitespace character is '*', which (approximately) indicates whether we added
+     * the second '*' to complete an existing (JSDoc) comment.
+     * @param fileName The file in which to perform the check.
+     * @param position The (character-indexed) position in the file where the check should
+     * be performed.
+     */
+    function getDocCommentTemplateAtPosition(newLine: string, sourceFile: SourceFile, position: number): TextInsertion | undefined;
+}
+declare namespace ts.NavigateTo {
+    function getNavigateToItems(sourceFiles: ReadonlyArray<SourceFile>, checker: TypeChecker, cancellationToken: CancellationToken, searchValue: string, maxResultCount: number | undefined, excludeDtsFiles: boolean): NavigateToItem[];
+}
+declare namespace ts.NavigationBar {
+    function getNavigationBarItems(sourceFile: SourceFile, cancellationToken: CancellationToken): NavigationBarItem[];
+    function getNavigationTree(sourceFile: SourceFile, cancellationToken: CancellationToken): NavigationTree;
+}
+declare namespace ts.OrganizeImports {
+    /**
+     * Organize imports by:
+     *   1) Removing unused imports
+     *   2) Coalescing imports from the same module
+     *   3) Sorting imports
+     */
+    function organizeImports(sourceFile: SourceFile, formatContext: formatting.FormatContext, host: LanguageServiceHost, program: Program, _preferences: UserPreferences): FileTextChanges[];
+    /**
+     * @param importGroup a list of ImportDeclarations, all with the same module name.
+     */
+    function coalesceImports(importGroup: ReadonlyArray<ImportDeclaration>): ReadonlyArray<ImportDeclaration>;
+    /**
+     * @param exportGroup a list of ExportDeclarations, all with the same module name.
+     */
+    function coalesceExports(exportGroup: ReadonlyArray<ExportDeclaration>): ReadonlyArray<ExportDeclaration>;
+    function compareModuleSpecifiers(m1: Expression, m2: Expression): Comparison;
+}
+declare namespace ts.OutliningElementsCollector {
+    function collectElements(sourceFile: SourceFile, cancellationToken: CancellationToken): OutliningSpan[];
+}
+declare namespace ts {
+    enum PatternMatchKind {
+        exact = 0,
+        prefix = 1,
+        substring = 2,
+        camelCase = 3
+    }
+    interface PatternMatch {
+        kind: PatternMatchKind;
+        isCaseSensitive: boolean;
+    }
+    interface PatternMatcher {
+        getMatchForLastSegmentOfPattern(candidate: string): PatternMatch | undefined;
+        getFullMatch(candidateContainers: ReadonlyArray<string>, candidate: string): PatternMatch | undefined;
+        patternContainsDots: boolean;
+    }
+    function createPatternMatcher(pattern: string): PatternMatcher | undefined;
+    function breakIntoCharacterSpans(identifier: string): TextSpan[];
+    function breakIntoWordSpans(identifier: string): TextSpan[];
+}
+declare namespace ts {
+    function preProcessFile(sourceText: string, readImportFiles?: boolean, detectJavaScriptImports?: boolean): PreProcessedFileInfo;
+}
+declare namespace ts.Rename {
+    function getRenameInfo(typeChecker: TypeChecker, defaultLibFileName: string, getCanonicalFileName: GetCanonicalFileName, sourceFile: SourceFile, position: number): RenameInfo;
+}
+declare namespace ts.SignatureHelp {
+    function getSignatureHelpItems(program: Program, sourceFile: SourceFile, position: number, cancellationToken: CancellationToken): SignatureHelpItems | undefined;
+    interface ArgumentInfoForCompletions {
+        readonly invocation: CallLikeExpression;
+        readonly argumentIndex: number;
+        readonly argumentCount: number;
+    }
+    function getArgumentInfoForCompletions(node: Node, position: number, sourceFile: SourceFile): ArgumentInfoForCompletions | undefined;
+}
+declare namespace ts {
+    function computeSuggestionDiagnostics(sourceFile: SourceFile, program: Program, cancellationToken: CancellationToken): DiagnosticWithLocation[];
+}
+declare namespace ts.SymbolDisplay {
+    function getSymbolKind(typeChecker: TypeChecker, symbol: Symbol, location: Node): ScriptElementKind;
+    function getSymbolModifiers(symbol: Symbol): string;
+    interface SymbolDisplayPartsDocumentationAndSymbolKind {
+        displayParts: SymbolDisplayPart[];
+        documentation: SymbolDisplayPart[];
+        symbolKind: ScriptElementKind;
+        tags: JSDocTagInfo[] | undefined;
+    }
+    function getSymbolDisplayPartsDocumentationAndSymbolKind(typeChecker: TypeChecker, symbol: Symbol, sourceFile: SourceFile, enclosingDeclaration: Node | undefined, location: Node, semanticMeaning?: SemanticMeaning, alias?: Symbol): SymbolDisplayPartsDocumentationAndSymbolKind;
+}
+declare namespace ts {
+    interface TranspileOptions {
+        compilerOptions?: CompilerOptions;
+        fileName?: string;
+        reportDiagnostics?: boolean;
+        moduleName?: string;
+        renamedDependencies?: MapLike<string>;
+        transformers?: CustomTransformers;
+    }
+    interface TranspileOutput {
+        outputText: string;
+        diagnostics?: Diagnostic[];
+        sourceMapText?: string;
+    }
+    function transpileModule(input: string, transpileOptions: TranspileOptions): TranspileOutput;
+    function transpile(input: string, compilerOptions?: CompilerOptions, fileName?: string, diagnostics?: Diagnostic[], moduleName?: string): string;
+    /** JS users may pass in string values for enum compiler options (such as ModuleKind), so convert. */
+    function fixupCompilerOptions(options: CompilerOptions, diagnostics: Diagnostic[]): CompilerOptions;
+}
+declare namespace ts.formatting {
+    enum FormattingRequestKind {
+        FormatDocument = 0,
+        FormatSelection = 1,
+        FormatOnEnter = 2,
+        FormatOnSemicolon = 3,
+        FormatOnOpeningCurlyBrace = 4,
+        FormatOnClosingCurlyBrace = 5
+    }
+    class FormattingContext {
+        readonly sourceFile: SourceFileLike;
+        formattingRequestKind: FormattingRequestKind;
+        options: FormatCodeSettings;
+        currentTokenSpan: TextRangeWithKind;
+        nextTokenSpan: TextRangeWithKind;
+        contextNode: Node;
+        currentTokenParent: Node;
+        nextTokenParent: Node;
+        private contextNodeAllOnSameLine;
+        private nextNodeAllOnSameLine;
+        private tokensAreOnSameLine;
+        private contextNodeBlockIsOnOneLine;
+        private nextNodeBlockIsOnOneLine;
+        constructor(sourceFile: SourceFileLike, formattingRequestKind: FormattingRequestKind, options: FormatCodeSettings);
+        updateContext(currentRange: TextRangeWithKind, currentTokenParent: Node, nextRange: TextRangeWithKind, nextTokenParent: Node, commonParent: Node): void;
+        ContextNodeAllOnSameLine(): boolean;
+        NextNodeAllOnSameLine(): boolean;
+        TokensAreOnSameLine(): boolean;
+        ContextNodeBlockIsOnOneLine(): boolean;
+        NextNodeBlockIsOnOneLine(): boolean;
+        private NodeIsOnOneLine;
+        private BlockIsOnOneLine;
+    }
+}
+declare namespace ts.formatting {
+    interface FormattingScanner {
+        advance(): void;
+        isOnToken(): boolean;
+        readTokenInfo(n: Node): TokenInfo;
+        getCurrentLeadingTrivia(): TextRangeWithKind[] | undefined;
+        lastTrailingTriviaWasNewLine(): boolean;
+        skipToEndOf(node: Node): void;
+    }
+    function getFormattingScanner<T>(text: string, languageVariant: LanguageVariant, startPos: number, endPos: number, cb: (scanner: FormattingScanner) => T): T;
+}
+declare namespace ts.formatting {
+    interface Rule {
+        readonly debugName: string;
+        readonly context: ReadonlyArray<ContextPredicate>;
+        readonly action: RuleAction;
+        readonly flags: RuleFlags;
+    }
+    type ContextPredicate = (context: FormattingContext) => boolean;
+    const anyContext: ReadonlyArray<ContextPredicate>;
+    enum RuleAction {
+        Ignore = 1,
+        Space = 2,
+        NewLine = 4,
+        Delete = 8
+    }
+    enum RuleFlags {
+        None = 0,
+        CanDeleteNewLines = 1
+    }
+    interface TokenRange {
+        readonly tokens: ReadonlyArray<SyntaxKind>;
+        readonly isSpecific: boolean;
+    }
+}
+declare namespace ts.formatting {
+    interface RuleSpec {
+        readonly leftTokenRange: TokenRange;
+        readonly rightTokenRange: TokenRange;
+        readonly rule: Rule;
+    }
+    function getAllRules(): RuleSpec[];
+}
+declare namespace ts.formatting {
+    function getFormatContext(options: FormatCodeSettings): FormatContext;
+    type RulesMap = (context: FormattingContext) => Rule | undefined;
+}
+declare namespace ts.formatting {
+    interface FormatContext {
+        readonly options: FormatCodeSettings;
+        readonly getRule: RulesMap;
+    }
+    interface TextRangeWithKind extends TextRange {
+        kind: SyntaxKind;
+    }
+    interface TextRangeWithTriviaKind extends TextRange {
+        kind: TriviaKind;
+    }
+    interface TokenInfo {
+        leadingTrivia: TextRangeWithTriviaKind[] | undefined;
+        token: TextRangeWithKind;
+        trailingTrivia: TextRangeWithTriviaKind[] | undefined;
+    }
+    function formatOnEnter(position: number, sourceFile: SourceFile, formatContext: FormatContext): TextChange[];
+    function formatOnSemicolon(position: number, sourceFile: SourceFile, formatContext: FormatContext): TextChange[];
+    function formatOnOpeningCurly(position: number, sourceFile: SourceFile, formatContext: FormatContext): TextChange[];
+    function formatOnClosingCurly(position: number, sourceFile: SourceFile, formatContext: FormatContext): TextChange[];
+    function formatDocument(sourceFile: SourceFile, formatContext: FormatContext): TextChange[];
+    function formatSelection(start: number, end: number, sourceFile: SourceFile, formatContext: FormatContext): TextChange[];
+    function formatNodeGivenIndentation(node: Node, sourceFileLike: SourceFileLike, languageVariant: LanguageVariant, initialIndentation: number, delta: number, formatContext: FormatContext): TextChange[];
+    /**
+     * @param precedingToken pass `null` if preceding token was already computed and result was `undefined`.
+     */
+    function getRangeOfEnclosingComment(sourceFile: SourceFile, position: number, onlyMultiLine: boolean, precedingToken?: Node | null, // tslint:disable-line:no-null-keyword
+    tokenAtPosition?: Node, predicate?: (c: CommentRange) => boolean): CommentRange | undefined;
+    function getIndentationString(indentation: number, options: EditorSettings): string;
+}
+declare namespace ts.formatting {
+    namespace SmartIndenter {
+        /**
+         * @param assumeNewLineBeforeCloseBrace
+         * `false` when called on text from a real source file.
+         * `true` when we need to assume `position` is on a newline.
+         *
+         * This is useful for codefixes. Consider
+         * ```
+         * function f() {
+         * |}
+         * ```
+         * with `position` at `|`.
+         *
+         * When inserting some text after an open brace, we would like to get indentation as if a newline was already there.
+         * By default indentation at `position` will be 0 so 'assumeNewLineBeforeCloseBrace' overrides this behavior.
+         */
+        function getIndentation(position: number, sourceFile: SourceFile, options: EditorSettings, assumeNewLineBeforeCloseBrace?: boolean): number;
+        function getIndentationForNode(n: Node, ignoreActualIndentationRange: TextRange, sourceFile: SourceFile, options: EditorSettings): number;
+        function getBaseIndentation(options: EditorSettings): number;
+        function isArgumentAndStartLineOverlapsExpressionBeingCalled(parent: Node, child: Node, childStartLine: number, sourceFile: SourceFileLike): boolean;
+        function childStartsOnTheSameLineWithElseInIfStatement(parent: Node, child: TextRangeWithKind, childStartLine: number, sourceFile: SourceFileLike): boolean;
+        function getContainingList(node: Node, sourceFile: SourceFile): NodeArray<Node> | undefined;
+        /**
+         * Character is the actual index of the character since the beginning of the line.
+         * Column - position of the character after expanding tabs to spaces.
+         * "0\t2$"
+         * value of 'character' for '$' is 3
+         * value of 'column' for '$' is 6 (assuming that tab size is 4)
+         */
+        function findFirstNonWhitespaceCharacterAndColumn(startPos: number, endPos: number, sourceFile: SourceFileLike, options: EditorSettings): {
+            column: number;
+            character: number;
+        };
+        function findFirstNonWhitespaceColumn(startPos: number, endPos: number, sourceFile: SourceFileLike, options: EditorSettings): number;
+        function nodeWillIndentChild(settings: FormatCodeSettings, parent: TextRangeWithKind, child: TextRangeWithKind | undefined, sourceFile: SourceFileLike | undefined, indentByDefault: boolean): boolean;
+        /**
+         * True when the parent node should indent the given child by an explicit rule.
+         * @param isNextChild If true, we are judging indent of a hypothetical child *after* this one, not the current child.
+         */
+        function shouldIndentChildNode(settings: FormatCodeSettings, parent: TextRangeWithKind, child?: Node, sourceFile?: SourceFileLike, isNextChild?: boolean): boolean;
+    }
+}
+declare namespace ts.textChanges {
+    interface ConfigurableStart {
+        /** True to use getStart() (NB, not getFullStart()) without adjustment. */
+        useNonAdjustedStartPosition?: boolean;
+    }
+    interface ConfigurableEnd {
+        /** True to use getEnd() without adjustment. */
+        useNonAdjustedEndPosition?: boolean;
+    }
+    enum Position {
+        FullStart = 0,
+        Start = 1
+    }
+    /**
+     * Usually node.pos points to a position immediately after the previous token.
+     * If this position is used as a beginning of the span to remove - it might lead to removing the trailing trivia of the previous node, i.e:
+     * const x; // this is x
+     *        ^ - pos for the next variable declaration will point here
+     * const y; // this is y
+     *        ^ - end for previous variable declaration
+     * Usually leading trivia of the variable declaration 'y' should not include trailing trivia (whitespace, comment 'this is x' and newline) from the preceding
+     * variable declaration and trailing trivia for 'y' should include (whitespace, comment 'this is y', newline).
+     * By default when removing nodes we adjust start and end positions to respect specification of the trivia above.
+     * If pos\end should be interpreted literally 'useNonAdjustedStartPosition' or 'useNonAdjustedEndPosition' should be set to true
+     */
+    interface ConfigurableStartEnd extends ConfigurableStart, ConfigurableEnd {
+    }
+    const useNonAdjustedPositions: ConfigurableStartEnd;
+    interface InsertNodeOptions {
+        /**
+         * Text to be inserted before the new node
+         */
+        prefix?: string;
+        /**
+         * Text to be inserted after the new node
+         */
+        suffix?: string;
+        /**
+         * Text of inserted node will be formatted with this indentation, otherwise indentation will be inferred from the old node
+         */
+        indentation?: number;
+        /**
+         * Text of inserted node will be formatted with this delta, otherwise delta will be inferred from the new node kind
+         */
+        delta?: number;
+        /**
+         * Do not trim leading white spaces in the edit range
+         */
+        preserveLeadingWhitespace?: boolean;
+    }
+    interface ReplaceWithMultipleNodesOptions extends InsertNodeOptions {
+        readonly joiner?: string;
+    }
+    interface ChangeNodeOptions extends ConfigurableStartEnd, InsertNodeOptions {
+    }
+    interface TextChangesContext {
+        host: LanguageServiceHost;
+        formatContext: formatting.FormatContext;
+    }
+    type TypeAnnotatable = SignatureDeclaration | VariableDeclaration | ParameterDeclaration | PropertyDeclaration | PropertySignature;
+    class ChangeTracker {
+        private readonly newLineCharacter;
+        private readonly formatContext;
+        private readonly changes;
+        private readonly newFiles;
+        private readonly deletedNodesInLists;
+        private readonly classesWithNodesInsertedAtStart;
+        static fromContext(context: TextChangesContext): ChangeTracker;
+        static with(context: TextChangesContext, cb: (tracker: ChangeTracker) => void): FileTextChanges[];
+        /** Public for tests only. Other callers should use `ChangeTracker.with`. */
+        constructor(newLineCharacter: string, formatContext: formatting.FormatContext);
+        deleteRange(sourceFile: SourceFile, range: TextRange): this;
+        /** Warning: This deletes comments too. See `copyComments` in `convertFunctionToEs6Class`. */
+        deleteNode(sourceFile: SourceFile, node: Node, options?: ConfigurableStartEnd): this;
+        deleteNodeRange(sourceFile: SourceFile, startNode: Node, endNode: Node, options?: ConfigurableStartEnd): this;
+        deleteNodeRangeExcludingEnd(sourceFile: SourceFile, startNode: Node, afterEndNode: Node | undefined, options?: ConfigurableStartEnd): void;
+        deleteNodeInList(sourceFile: SourceFile, node: Node): this;
+        replaceRange(sourceFile: SourceFile, range: TextRange, newNode: Node, options?: InsertNodeOptions): this;
+        replaceNode(sourceFile: SourceFile, oldNode: Node, newNode: Node, options?: ChangeNodeOptions): this;
+        replaceNodeRange(sourceFile: SourceFile, startNode: Node, endNode: Node, newNode: Node, options?: ChangeNodeOptions): void;
+        private replaceRangeWithNodes;
+        replaceNodeWithNodes(sourceFile: SourceFile, oldNode: Node, newNodes: ReadonlyArray<Node>, options?: ChangeNodeOptions): this;
+        replaceNodeRangeWithNodes(sourceFile: SourceFile, startNode: Node, endNode: Node, newNodes: ReadonlyArray<Node>, options?: ReplaceWithMultipleNodesOptions & ConfigurableStartEnd): this;
+        private nextCommaToken;
+        replacePropertyAssignment(sourceFile: SourceFile, oldNode: PropertyAssignment, newNode: PropertyAssignment): this;
+        private insertNodeAt;
+        private insertNodesAt;
+        insertNodeAtTopOfFile(sourceFile: SourceFile, newNode: Statement, blankLineBetween: boolean): void;
+        insertNodeBefore(sourceFile: SourceFile, before: Node, newNode: Node, blankLineBetween?: boolean): void;
+        insertModifierBefore(sourceFile: SourceFile, modifier: SyntaxKind, before: Node): void;
+        insertCommentBeforeLine(sourceFile: SourceFile, lineNumber: number, position: number, commentText: string): void;
+        replaceRangeWithText(sourceFile: SourceFile, range: TextRange, text: string): void;
+        private insertText;
+        /** Prefer this over replacing a node with another that has a type annotation, as it avoids reformatting the other parts of the node. */
+        tryInsertTypeAnnotation(sourceFile: SourceFile, node: TypeAnnotatable, type: TypeNode): void;
+        insertTypeParameters(sourceFile: SourceFile, node: SignatureDeclaration, typeParameters: ReadonlyArray<TypeParameterDeclaration>): void;
+        private getOptionsForInsertNodeBefore;
+        insertNodeAtConstructorStart(sourceFile: SourceFile, ctr: ConstructorDeclaration, newStatement: Statement): void;
+        insertNodeAtConstructorEnd(sourceFile: SourceFile, ctr: ConstructorDeclaration, newStatement: Statement): void;
+        private replaceConstructorBody;
+        insertNodeAtEndOfScope(sourceFile: SourceFile, scope: Node, newNode: Node): void;
+        insertNodeAtClassStart(sourceFile: SourceFile, cls: ClassLikeDeclaration, newElement: ClassElement): void;
+        private getInsertNodeAtClassStartPrefixSuffix;
+        insertNodeAfterComma(sourceFile: SourceFile, after: Node, newNode: Node): void;
+        insertNodeAfter(sourceFile: SourceFile, after: Node, newNode: Node): void;
+        insertNodesAfter(sourceFile: SourceFile, after: Node, newNodes: ReadonlyArray<Node>): void;
+        private insertNodeAfterWorker;
+        private getInsertNodeAfterOptions;
+        private getInsertNodeAfterOptionsWorker;
+        insertName(sourceFile: SourceFile, node: FunctionExpression | ClassExpression | ArrowFunction, name: string): void;
+        insertExportModifier(sourceFile: SourceFile, node: DeclarationStatement | VariableStatement): void;
+        /**
+         * This function should be used to insert nodes in lists when nodes don't carry separators as the part of the node range,
+         * i.e. arguments in arguments lists, parameters in parameter lists etc.
+         * Note that separators are part of the node in statements and class elements.
+         */
+        insertNodeInListAfter(sourceFile: SourceFile, after: Node, newNode: Node, containingList?: NodeArray<Node> | undefined): this;
+        private finishClassesWithNodesInsertedAtStart;
+        private finishTrailingCommaAfterDeletingNodesInList;
+        /**
+         * Note: after calling this, the TextChanges object must be discarded!
+         * @param validate only for tests
+         *    The reason we must validate as part of this method is that `getNonFormattedText` changes the node's positions,
+         *    so we can only call this once and can't get the non-formatted text separately.
+         */
+        getChanges(validate?: ValidateNonFormattedText): FileTextChanges[];
+        createNewFile(oldFile: SourceFile, fileName: string, statements: ReadonlyArray<Statement>): void;
+    }
+    type ValidateNonFormattedText = (node: Node, text: string) => void;
+    function applyChanges(text: string, changes: TextChange[]): string;
+    function isValidLocationToAddComment(sourceFile: SourceFile, position: number): boolean;
+}
+declare namespace ts {
+    interface CodeFixRegistration {
+        errorCodes: number[];
+        getCodeActions(context: CodeFixContext): CodeFixAction[] | undefined;
+        fixIds?: string[];
+        getAllCodeActions?(context: CodeFixAllContext): CombinedCodeActions;
+    }
+    interface CodeFixContextBase extends textChanges.TextChangesContext {
+        sourceFile: SourceFile;
+        program: Program;
+        cancellationToken: CancellationToken;
+        preferences: UserPreferences;
+    }
+    interface CodeFixAllContext extends CodeFixContextBase {
+        fixId: {};
+    }
+    interface CodeFixContext extends CodeFixContextBase {
+        errorCode: number;
+        span: TextSpan;
+    }
+    namespace codefix {
+        type DiagnosticAndArguments = DiagnosticMessage | [DiagnosticMessage, string] | [DiagnosticMessage, string, string];
+        function createCodeFixActionNoFixId(fixName: string, changes: FileTextChanges[], description: DiagnosticAndArguments): CodeFixAction;
+        function createCodeFixAction(fixName: string, changes: FileTextChanges[], description: DiagnosticAndArguments, fixId: {}, fixAllDescription: DiagnosticAndArguments, command?: CodeActionCommand): CodeFixAction;
+        function registerCodeFix(reg: CodeFixRegistration): void;
+        function getSupportedErrorCodes(): string[];
+        function getFixes(context: CodeFixContext): CodeFixAction[];
+        function getAllFixes(context: CodeFixAllContext): CombinedCodeActions;
+        function createFileTextChanges(fileName: string, textChanges: TextChange[]): FileTextChanges;
+        function codeFixAll(context: CodeFixAllContext, errorCodes: number[], use: (changes: textChanges.ChangeTracker, error: DiagnosticWithLocation, commands: Push<CodeActionCommand>) => void): CombinedCodeActions;
+    }
+}
+declare namespace ts {
+    interface Refactor {
+        /** Compute the associated code actions */
+        getEditsForAction(context: RefactorContext, actionName: string): RefactorEditInfo | undefined;
+        /** Compute (quickly) which actions are available here */
+        getAvailableActions(context: RefactorContext): ApplicableRefactorInfo[] | undefined;
+    }
+    interface RefactorContext extends textChanges.TextChangesContext {
+        file: SourceFile;
+        startPosition: number;
+        endPosition?: number;
+        program: Program;
+        cancellationToken?: CancellationToken;
+        preferences: UserPreferences;
+    }
+    namespace refactor {
+        /** @param name An unique code associated with each refactor. Does not have to be human-readable. */
+        function registerRefactor(name: string, refactor: Refactor): void;
+        function getApplicableRefactors(context: RefactorContext): ApplicableRefactorInfo[];
+        function getEditsForRefactor(context: RefactorContext, refactorName: string, actionName: string): RefactorEditInfo | undefined;
+    }
+    function getRefactorContextSpan({ startPosition, endPosition }: RefactorContext): TextSpan;
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+    type DeclarationWithType = FunctionLikeDeclaration | VariableDeclaration | PropertySignature | PropertyDeclaration;
+    function parameterShouldGetTypeFromJSDoc(node: Node): node is DeclarationWithType;
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+    function getImportCompletionAction(exportedSymbol: Symbol, moduleSymbol: Symbol, sourceFile: SourceFile, symbolName: string, host: LanguageServiceHost, program: Program, checker: TypeChecker, compilerOptions: CompilerOptions, allSourceFiles: ReadonlyArray<SourceFile>, formatContext: formatting.FormatContext, getCanonicalFileName: GetCanonicalFileName, symbolToken: Node | undefined, preferences: UserPreferences): {
+        readonly moduleSpecifier: string;
+        readonly codeAction: CodeAction;
+    };
+    function forEachExternalModuleToImportFrom(checker: TypeChecker, from: SourceFile, allSourceFiles: ReadonlyArray<SourceFile>, cb: (module: Symbol) => void): void;
+    function moduleSymbolToValidIdentifier(moduleSymbol: Symbol, target: ScriptTarget): string;
+    function moduleSpecifierToValidIdentifier(moduleSpecifier: string, target: ScriptTarget): string;
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+    /**
+     * Finds members of the resolved type that are missing in the class pointed to by class decl
+     * and generates source code for the missing members.
+     * @param possiblyMissingSymbols The collection of symbols to filter and then get insertions for.
+     * @returns Empty string iff there are no member insertions.
+     */
+    function createMissingMemberNodes(classDeclaration: ClassLikeDeclaration, possiblyMissingSymbols: ReadonlyArray<Symbol>, checker: TypeChecker, preferences: UserPreferences, out: (node: ClassElement) => void): void;
+    function createMethodFromCallExpression({ typeArguments, arguments: args, parent: parent }: CallExpression, methodName: string, inJs: boolean, makeStatic: boolean, preferences: UserPreferences): MethodDeclaration;
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.refactor.generateGetAccessorAndSetAccessor {
+}
+declare namespace ts.refactor.extractSymbol {
+    /**
+     * Compute the associated code actions
+     * Exported for tests.
+     */
+    function getAvailableActions(context: RefactorContext): ApplicableRefactorInfo[] | undefined;
+    function getEditsForAction(context: RefactorContext, actionName: string): RefactorEditInfo | undefined;
+    namespace Messages {
+        const cannotExtractRange: DiagnosticMessage;
+        const cannotExtractImport: DiagnosticMessage;
+        const cannotExtractSuper: DiagnosticMessage;
+        const cannotExtractEmpty: DiagnosticMessage;
+        const expressionExpected: DiagnosticMessage;
+        const uselessConstantType: DiagnosticMessage;
+        const statementOrExpressionExpected: DiagnosticMessage;
+        const cannotExtractRangeContainingConditionalBreakOrContinueStatements: DiagnosticMessage;
+        const cannotExtractRangeContainingConditionalReturnStatement: DiagnosticMessage;
+        const cannotExtractRangeContainingLabeledBreakOrContinueStatementWithTargetOutsideOfTheRange: DiagnosticMessage;
+        const cannotExtractRangeThatContainsWritesToReferencesLocatedOutsideOfTheTargetRangeInGenerators: DiagnosticMessage;
+        const typeWillNotBeVisibleInTheNewScope: DiagnosticMessage;
+        const functionWillNotBeVisibleInTheNewScope: DiagnosticMessage;
+        const cannotExtractIdentifier: DiagnosticMessage;
+        const cannotExtractExportedEntity: DiagnosticMessage;
+        const cannotWriteInExpression: DiagnosticMessage;
+        const cannotExtractReadonlyPropertyInitializerOutsideConstructor: DiagnosticMessage;
+        const cannotExtractAmbientBlock: DiagnosticMessage;
+        const cannotAccessVariablesFromNestedScopes: DiagnosticMessage;
+        const cannotExtractToOtherFunctionLike: DiagnosticMessage;
+        const cannotExtractToJSClass: DiagnosticMessage;
+        const cannotExtractToExpressionArrowFunction: DiagnosticMessage;
+    }
+    enum RangeFacts {
+        None = 0,
+        HasReturn = 1,
+        IsGenerator = 2,
+        IsAsyncFunction = 4,
+        UsesThis = 8,
+        /**
+         * The range is in a function which needs the 'static' modifier in a class
+         */
+        InStaticRegion = 16
+    }
+    /**
+     * Represents an expression or a list of statements that should be extracted with some extra information
+     */
+    interface TargetRange {
+        readonly range: Expression | Statement[];
+        readonly facts: RangeFacts;
+        /**
+         * A list of symbols that are declared in the selected range which are visible in the containing lexical scope
+         * Used to ensure we don't turn something used outside the range free (or worse, resolve to a different entity).
+         */
+        readonly declarations: Symbol[];
+    }
+    /**
+     * Result of 'getRangeToExtract' operation: contains either a range or a list of errors
+     */
+    type RangeToExtract = {
+        readonly targetRange?: never;
+        readonly errors: ReadonlyArray<Diagnostic>;
+    } | {
+        readonly targetRange: TargetRange;
+        readonly errors?: never;
+    };
+    /**
+     * getRangeToExtract takes a span inside a text file and returns either an expression or an array
+     * of statements representing the minimum set of nodes needed to extract the entire span. This
+     * process may fail, in which case a set of errors is returned instead (these are currently
+     * not shown to the user, but can be used by us diagnostically)
+     */
+    function getRangeToExtract(sourceFile: SourceFile, span: TextSpan): RangeToExtract;
+}
+declare namespace ts.refactor.generateGetAccessorAndSetAccessor {
+}
+declare namespace ts.refactor {
+}
+declare namespace ts.sourcemaps {
+    interface SourceMapData {
+        version?: number;
+        file?: string;
+        sourceRoot?: string;
+        sources: string[];
+        sourcesContent?: string[];
+        names?: string[];
+        mappings: string;
+    }
+    interface SourceMappableLocation {
+        fileName: string;
+        position: number;
+    }
+    interface SourceMapper {
+        getOriginalPosition(input: SourceMappableLocation): SourceMappableLocation;
+        getGeneratedPosition(input: SourceMappableLocation): SourceMappableLocation;
+    }
+    const identitySourceMapper: {
+        getOriginalPosition: typeof identity;
+        getGeneratedPosition: typeof identity;
+    };
+    interface SourceMapDecodeHost {
+        readFile(path: string): string | undefined;
+        fileExists(path: string): boolean;
+        getCanonicalFileName(path: string): string;
+        log(text: string): void;
+    }
+    function decode(host: SourceMapDecodeHost, mapPath: string, map: SourceMapData, program?: Program, fallbackCache?: SourceFileLikeCache): SourceMapper;
+}
+declare namespace ts {
+    /** The version of the language service API */
+    const servicesVersion = "0.8";
+    interface DisplayPartsSymbolWriter extends EmitTextWriter {
+        displayParts(): SymbolDisplayPart[];
+    }
+    function toEditorSettings(options: FormatCodeOptions | FormatCodeSettings): FormatCodeSettings;
+    function toEditorSettings(options: EditorOptions | EditorSettings): EditorSettings;
+    function displayPartsToString(displayParts: SymbolDisplayPart[] | undefined): string;
+    function getDefaultCompilerOptions(): CompilerOptions;
+    function getSupportedCodeFixes(): string[];
+    function createLanguageServiceSourceFile(fileName: string, scriptSnapshot: IScriptSnapshot, scriptTarget: ScriptTarget, version: string, setNodeParents: boolean, scriptKind?: ScriptKind): SourceFile;
+    let disableIncrementalParsing: boolean;
+    function updateLanguageServiceSourceFile(sourceFile: SourceFile, scriptSnapshot: IScriptSnapshot, version: string, textChangeRange: TextChangeRange | undefined, aggressiveChecks?: boolean): SourceFile;
+    /** A cancellation that throttles calls to the host */
+    class ThrottledCancellationToken implements CancellationToken {
+        private hostCancellationToken;
+        private readonly throttleWaitMilliseconds;
+        private lastCancellationCheckTime;
+        constructor(hostCancellationToken: HostCancellationToken, throttleWaitMilliseconds?: number);
+        isCancellationRequested(): boolean;
+        throwIfCancellationRequested(): void;
+    }
+    interface SourceFileLikeCache {
+        get(path: Path): SourceFileLike | undefined;
+    }
+    function createSourceFileLikeCache(host: {
+        readFile?: (path: string) => string | undefined;
+        fileExists?: (path: string) => boolean;
+    }): SourceFileLikeCache;
+    function createLanguageService(host: LanguageServiceHost, documentRegistry?: DocumentRegistry, syntaxOnly?: boolean): LanguageService;
+    /** Names in the name table are escaped, so an identifier `__foo` will have a name table entry `___foo`. */
+    function getNameTable(sourceFile: SourceFile): UnderscoreEscapedMap<number>;
+    /**
+     * Returns the containing object literal property declaration given a possible name node, e.g. "a" in x = { "a": 1 }
+     */
+    function getContainingObjectLiteralElement(node: Node): ObjectLiteralElement | undefined;
+    function getPropertySymbolsFromContextualType(typeChecker: TypeChecker, node: ObjectLiteralElement): Symbol[];
+    function getPropertySymbolsFromType(type: Type, propName: PropertyName): Symbol[] | undefined;
+    /**
+     * Get the path of the default library files (lib.d.ts) as distributed with the typescript
+     * node package.
+     * The functionality is not supported if the ts module is consumed outside of a node module.
+     */
+    function getDefaultLibFilePath(options: CompilerOptions): string;
+}
+declare namespace ts.BreakpointResolver {
+    /**
+     * Get the breakpoint span in given sourceFile
+     */
+    function spanInSourceFileAtLocation(sourceFile: SourceFile, position: number): TextSpan | undefined;
+}
+declare namespace ts {
+    /**
+     * Transform one or more nodes using the supplied transformers.
+     * @param source A single `Node` or an array of `Node` objects.
+     * @param transformers An array of `TransformerFactory` callbacks used to process the transformation.
+     * @param compilerOptions Optional compiler options.
+     */
+    function transform<T extends Node>(source: T | T[], transformers: TransformerFactory<T>[], compilerOptions?: CompilerOptions): TransformationResult<T>;
+}
+declare let debugObjectHost: {
+    CollectGarbage(): void;
+};
+declare namespace ts {
+    interface ScriptSnapshotShim {
+        /** Gets a portion of the script snapshot specified by [start, end). */
+        getText(start: number, end: number): string;
+        /** Gets the length of this script snapshot. */
+        getLength(): number;
+        /**
+         * Returns a JSON-encoded value of the type:
+         *   { span: { start: number; length: number }; newLength: number }
+         *
+         * Or undefined value if there was no change.
+         */
+        getChangeRange(oldSnapshot: ScriptSnapshotShim): string | undefined;
+        /** Releases all resources held by this script snapshot */
+        dispose?(): void;
+    }
+    interface Logger {
+        log(s: string): void;
+        trace(s: string): void;
+        error(s: string): void;
+    }
+    /** Public interface of the host of a language service shim instance. */
+    interface LanguageServiceShimHost extends Logger {
+        getCompilationSettings(): string;
+        /** Returns a JSON-encoded value of the type: string[] */
+        getScriptFileNames(): string;
+        getScriptKind?(fileName: string): ScriptKind;
+        getScriptVersion(fileName: string): string;
+        getScriptSnapshot(fileName: string): ScriptSnapshotShim;
+        getLocalizedDiagnosticMessages(): string;
+        getCancellationToken(): HostCancellationToken;
+        getCurrentDirectory(): string;
+        getDirectories(path: string): string;
+        getDefaultLibFileName(options: string): string;
+        getNewLine?(): string;
+        getProjectVersion?(): string;
+        useCaseSensitiveFileNames?(): boolean;
+        getTypeRootsVersion?(): number;
+        readDirectory(rootDir: string, extension: string, basePaths?: string, excludeEx?: string, includeFileEx?: string, includeDirEx?: string, depth?: number): string;
+        readFile(path: string, encoding?: string): string | undefined;
+        fileExists(path: string): boolean;
+        getModuleResolutionsForFile?(fileName: string): string;
+        getTypeReferenceDirectiveResolutionsForFile?(fileName: string): string;
+        directoryExists(directoryName: string): boolean;
+    }
+    /** Public interface of the core-services host instance used in managed side */
+    interface CoreServicesShimHost extends Logger {
+        directoryExists(directoryName: string): boolean;
+        fileExists(fileName: string): boolean;
+        getCurrentDirectory(): string;
+        getDirectories(path: string): string;
+        /**
+         * Returns a JSON-encoded value of the type: string[]
+         *
+         * @param exclude A JSON encoded string[] containing the paths to exclude
+         *  when enumerating the directory.
+         */
+        readDirectory(rootDir: string, extension: string, basePaths?: string, excludeEx?: string, includeFileEx?: string, includeDirEx?: string, depth?: number): string;
+        /**
+         * Read arbitary text files on disk, i.e. when resolution procedure needs the content of 'package.json' to determine location of bundled typings for node modules
+         */
+        readFile(fileName: string): string | undefined;
+        realpath?(path: string): string;
+        trace(s: string): void;
+        useCaseSensitiveFileNames?(): boolean;
+    }
+    interface ShimsFileReference {
+        path: string;
+        position: number;
+        length: number;
+    }
+    /** Public interface of a language service instance shim. */
+    interface ShimFactory {
+        registerShim(shim: Shim): void;
+        unregisterShim(shim: Shim): void;
+    }
+    interface Shim {
+        dispose(_dummy: {}): void;
+    }
+    interface LanguageServiceShim extends Shim {
+        languageService: LanguageService;
+        dispose(_dummy: {}): void;
+        refresh(throwOnError: boolean): void;
+        cleanupSemanticCache(): void;
+        getSyntacticDiagnostics(fileName: string): string;
+        getSemanticDiagnostics(fileName: string): string;
+        getSuggestionDiagnostics(fileName: string): string;
+        getCompilerOptionsDiagnostics(): string;
+        getSyntacticClassifications(fileName: string, start: number, length: number): string;
+        getSemanticClassifications(fileName: string, start: number, length: number): string;
+        getEncodedSyntacticClassifications(fileName: string, start: number, length: number): string;
+        getEncodedSemanticClassifications(fileName: string, start: number, length: number): string;
+        getCompletionsAtPosition(fileName: string, position: number, preferences: UserPreferences | undefined): string;
+        getCompletionEntryDetails(fileName: string, position: number, entryName: string, formatOptions: string | undefined, source: string | undefined, preferences: UserPreferences | undefined): string;
+        getQuickInfoAtPosition(fileName: string, position: number): string;
+        getNameOrDottedNameSpan(fileName: string, startPos: number, endPos: number): string;
+        getBreakpointStatementAtPosition(fileName: string, position: number): string;
+        getSignatureHelpItems(fileName: string, position: number): string;
+        /**
+         * Returns a JSON-encoded value of the type:
+         * { canRename: boolean, localizedErrorMessage: string, displayName: string, fullDisplayName: string, kind: string, kindModifiers: string, triggerSpan: { start; length } }
+         */
+        getRenameInfo(fileName: string, position: number): string;
+        /**
+         * Returns a JSON-encoded value of the type:
+         * { fileName: string, textSpan: { start: number, length: number } }[]
+         */
+        findRenameLocations(fileName: string, position: number, findInStrings: boolean, findInComments: boolean): string;
+        /**
+         * Returns a JSON-encoded value of the type:
+         * { fileName: string; textSpan: { start: number; length: number}; kind: string; name: string; containerKind: string; containerName: string }
+         *
+         * Or undefined value if no definition can be found.
+         */
+        getDefinitionAtPosition(fileName: string, position: number): string;
+        getDefinitionAndBoundSpan(fileName: string, position: number): string;
+        /**
+         * Returns a JSON-encoded value of the type:
+         * { fileName: string; textSpan: { start: number; length: number}; kind: string; name: string; containerKind: string; containerName: string }
+         *
+         * Or undefined value if no definition can be found.
+         */
+        getTypeDefinitionAtPosition(fileName: string, position: number): string;
+        /**
+         * Returns a JSON-encoded value of the type:
+         * { fileName: string; textSpan: { start: number; length: number}; }[]
+         */
+        getImplementationAtPosition(fileName: string, position: number): string;
+        /**
+         * Returns a JSON-encoded value of the type:
+         * { fileName: string; textSpan: { start: number; length: number}; isWriteAccess: boolean, isDefinition?: boolean }[]
+         */
+        getReferencesAtPosition(fileName: string, position: number): string;
+        /**
+         * Returns a JSON-encoded value of the type:
+         * { definition: <encoded>; references: <encoded>[] }[]
+         */
+        findReferences(fileName: string, position: number): string;
+        /**
+         * @deprecated
+         * Returns a JSON-encoded value of the type:
+         * { fileName: string; textSpan: { start: number; length: number}; isWriteAccess: boolean }[]
+         */
+        getOccurrencesAtPosition(fileName: string, position: number): string;
+        /**
+         * Returns a JSON-encoded value of the type:
+         * { fileName: string; highlights: { start: number; length: number, isDefinition: boolean }[] }[]
+         *
+         * @param fileToSearch A JSON encoded string[] containing the file names that should be
+         *  considered when searching.
+         */
+        getDocumentHighlights(fileName: string, position: number, filesToSearch: string): string;
+        /**
+         * Returns a JSON-encoded value of the type:
+         * { name: string; kind: string; kindModifiers: string; containerName: string; containerKind: string; matchKind: string; fileName: string; textSpan: { start: number; length: number}; } [] = [];
+         */
+        getNavigateToItems(searchValue: string, maxResultCount?: number, fileName?: string): string;
+        /**
+         * Returns a JSON-encoded value of the type:
+         * { text: string; kind: string; kindModifiers: string; bolded: boolean; grayed: boolean; indent: number; spans: { start: number; length: number; }[]; childItems: <recursive use of this type>[] } [] = [];
+         */
+        getNavigationBarItems(fileName: string): string;
+        /** Returns a JSON-encoded value of the type ts.NavigationTree. */
+        getNavigationTree(fileName: string): string;
+        /**
+         * Returns a JSON-encoded value of the type:
+         * { textSpan: { start: number, length: number }; hintSpan: { start: number, length: number }; bannerText: string; autoCollapse: boolean } [] = [];
+         */
+        getOutliningSpans(fileName: string): string;
+        getTodoComments(fileName: string, todoCommentDescriptors: string): string;
+        getBraceMatchingAtPosition(fileName: string, position: number): string;
+        getIndentationAtPosition(fileName: string, position: number, options: string): string;
+        getFormattingEditsForRange(fileName: string, start: number, end: number, options: string): string;
+        getFormattingEditsForDocument(fileName: string, options: string): string;
+        getFormattingEditsAfterKeystroke(fileName: string, position: number, key: string, options: string): string;
+        /**
+         * Returns JSON-encoded value of the type TextInsertion.
+         */
+        getDocCommentTemplateAtPosition(fileName: string, position: number): string;
+        /**
+         * Returns JSON-encoded boolean to indicate whether we should support brace location
+         * at the current position.
+         * E.g. we don't want brace completion inside string-literals, comments, etc.
+         */
+        isValidBraceCompletionAtPosition(fileName: string, position: number, openingBrace: number): string;
+        /**
+         * Returns a JSON-encoded TextSpan | undefined indicating the range of the enclosing comment, if it exists.
+         */
+        getSpanOfEnclosingComment(fileName: string, position: number, onlyMultiLine: boolean): string;
+        getEmitOutput(fileName: string): string;
+        getEmitOutputObject(fileName: string): EmitOutput;
+    }
+    interface ClassifierShim extends Shim {
+        getEncodedLexicalClassifications(text: string, lexState: EndOfLineState, syntacticClassifierAbsent?: boolean): string;
+        getClassificationsForLine(text: string, lexState: EndOfLineState, syntacticClassifierAbsent?: boolean): string;
+    }
+    interface CoreServicesShim extends Shim {
+        getAutomaticTypeDirectiveNames(compilerOptionsJson: string): string;
+        getPreProcessedFileInfo(fileName: string, sourceText: IScriptSnapshot): string;
+        getTSConfigFileInfo(fileName: string, sourceText: IScriptSnapshot): string;
+        getDefaultCompilationSettings(): string;
+        discoverTypings(discoverTypingsJson: string): string;
+    }
+    class LanguageServiceShimHostAdapter implements LanguageServiceHost {
+        private shimHost;
+        private files;
+        private loggingEnabled;
+        private tracingEnabled;
+        resolveModuleNames: (moduleName: string[], containingFile: string) => ResolvedModuleFull[];
+        resolveTypeReferenceDirectives: (typeDirectiveNames: string[], containingFile: string) => ResolvedTypeReferenceDirective[];
+        directoryExists: (directoryName: string) => boolean;
+        constructor(shimHost: LanguageServiceShimHost);
+        log(s: string): void;
+        trace(s: string): void;
+        error(s: string): void;
+        getProjectVersion(): string;
+        getTypeRootsVersion(): number;
+        useCaseSensitiveFileNames(): boolean;
+        getCompilationSettings(): CompilerOptions;
+        getScriptFileNames(): string[];
+        getScriptSnapshot(fileName: string): IScriptSnapshot | undefined;
+        getScriptKind(fileName: string): ScriptKind;
+        getScriptVersion(fileName: string): string;
+        getLocalizedDiagnosticMessages(): any;
+        getCancellationToken(): HostCancellationToken;
+        getCurrentDirectory(): string;
+        getDirectories(path: string): string[];
+        getDefaultLibFileName(options: CompilerOptions): string;
+        readDirectory(path: string, extensions?: ReadonlyArray<string>, exclude?: string[], include?: string[], depth?: number): string[];
+        readFile(path: string, encoding?: string): string | undefined;
+        fileExists(path: string): boolean;
+    }
+    class CoreServicesShimHostAdapter implements ParseConfigHost, ModuleResolutionHost, JsTyping.TypingResolutionHost {
+        private shimHost;
+        directoryExists: (directoryName: string) => boolean;
+        realpath: (path: string) => string;
+        useCaseSensitiveFileNames: boolean;
+        constructor(shimHost: CoreServicesShimHost);
+        readDirectory(rootDir: string, extensions: ReadonlyArray<string>, exclude: ReadonlyArray<string>, include: ReadonlyArray<string>, depth?: number): string[];
+        fileExists(fileName: string): boolean;
+        readFile(fileName: string): string | undefined;
+        getDirectories(path: string): string[];
+    }
+    interface RealizedDiagnostic {
+        message: string;
+        start: number;
+        length: number;
+        category: string;
+        code: number;
+        reportsUnnecessary?: {};
+    }
+    function realizeDiagnostics(diagnostics: ReadonlyArray<Diagnostic>, newLine: string): RealizedDiagnostic[];
+    class TypeScriptServicesFactory implements ShimFactory {
+        private _shims;
+        private documentRegistry;
+        getServicesVersion(): string;
+        createLanguageServiceShim(host: LanguageServiceShimHost): LanguageServiceShim;
+        createClassifierShim(logger: Logger): ClassifierShim;
+        createCoreServicesShim(host: CoreServicesShimHost): CoreServicesShim;
+        close(): void;
+        registerShim(shim: Shim): void;
+        unregisterShim(shim: Shim): void;
+    }
+}
+declare namespace TypeScript.Services {
+    const TypeScriptServicesFactory: typeof ts.TypeScriptServicesFactory;
+}
+declare const toolsVersion = "3.0";
+//# sourceMappingURL=services.d.ts.map
+declare namespace ts.server {
+    const ActionSet: ActionSet;
+    const ActionInvalidate: ActionInvalidate;
+    const ActionPackageInstalled: ActionPackageInstalled;
+    const EventTypesRegistry: EventTypesRegistry;
+    const EventBeginInstallTypes: EventBeginInstallTypes;
+    const EventEndInstallTypes: EventEndInstallTypes;
+    const EventInitializationFailed: EventInitializationFailed;
+    namespace Arguments {
+        const GlobalCacheLocation = "--globalTypingsCacheLocation";
+        const LogFile = "--logFile";
+        const EnableTelemetry = "--enableTelemetry";
+        const TypingSafeListLocation = "--typingSafeListLocation";
+        const TypesMapLocation = "--typesMapLocation";
+        /**
+         * This argument specifies the location of the NPM executable.
+         * typingsInstaller will run the command with `${npmLocation} install ...`.
+         */
+        const NpmLocation = "--npmLocation";
+    }
+    function hasArgument(argumentName: string): boolean;
+    function findArgument(argumentName: string): string | undefined;
+    function nowString(): string;
+}
+declare namespace ts.server {
+    type ActionSet = "action::set";
+    type ActionInvalidate = "action::invalidate";
+    type ActionPackageInstalled = "action::packageInstalled";
+    type EventTypesRegistry = "event::typesRegistry";
+    type EventBeginInstallTypes = "event::beginInstallTypes";
+    type EventEndInstallTypes = "event::endInstallTypes";
+    type EventInitializationFailed = "event::initializationFailed";
+    interface SortedReadonlyArray<T> extends ReadonlyArray<T> {
+        " __sortedArrayBrand": any;
+    }
+    interface TypingInstallerResponse {
+        readonly kind: ActionSet | ActionInvalidate | EventTypesRegistry | ActionPackageInstalled | EventBeginInstallTypes | EventEndInstallTypes | EventInitializationFailed;
+    }
+    interface TypingInstallerRequestWithProjectName {
+        readonly projectName: string;
+    }
+    type TypingInstallerRequestUnion = DiscoverTypings | CloseProject | TypesRegistryRequest | InstallPackageRequest;
+    interface DiscoverTypings extends TypingInstallerRequestWithProjectName {
+        readonly fileNames: string[];
+        readonly projectRootPath: Path;
+        readonly compilerOptions: CompilerOptions;
+        readonly typeAcquisition: TypeAcquisition;
+        readonly unresolvedImports: SortedReadonlyArray<string>;
+        readonly cachePath?: string;
+        readonly kind: "discover";
+    }
+    interface CloseProject extends TypingInstallerRequestWithProjectName {
+        readonly kind: "closeProject";
+    }
+    interface TypesRegistryRequest {
+        readonly kind: "typesRegistry";
+    }
+    interface InstallPackageRequest extends TypingInstallerRequestWithProjectName {
+        readonly kind: "installPackage";
+        readonly fileName: Path;
+        readonly packageName: string;
+        readonly projectRootPath: Path;
+    }
+    interface TypesRegistryResponse extends TypingInstallerResponse {
+        readonly kind: EventTypesRegistry;
+        readonly typesRegistry: MapLike<MapLike<string>>;
+    }
+    interface PackageInstalledResponse extends ProjectResponse {
+        readonly kind: ActionPackageInstalled;
+        readonly success: boolean;
+        readonly message: string;
+    }
+    interface InitializationFailedResponse extends TypingInstallerResponse {
+        readonly kind: EventInitializationFailed;
+        readonly message: string;
+    }
+    interface ProjectResponse extends TypingInstallerResponse {
+        readonly projectName: string;
+    }
+    interface InvalidateCachedTypings extends ProjectResponse {
+        readonly kind: ActionInvalidate;
+    }
+    interface InstallTypes extends ProjectResponse {
+        readonly kind: EventBeginInstallTypes | EventEndInstallTypes;
+        readonly eventId: number;
+        readonly typingsInstallerVersion: string;
+        readonly packagesToInstall: ReadonlyArray<string>;
+    }
+    interface BeginInstallTypes extends InstallTypes {
+        readonly kind: EventBeginInstallTypes;
+    }
+    interface EndInstallTypes extends InstallTypes {
+        readonly kind: EventEndInstallTypes;
+        readonly installSuccess: boolean;
+    }
+    interface InstallTypingHost extends JsTyping.TypingResolutionHost {
+        useCaseSensitiveFileNames: boolean;
+        writeFile(path: string, content: string): void;
+        createDirectory(path: string): void;
+        watchFile?(path: string, callback: FileWatcherCallback, pollingInterval?: number): FileWatcher;
+        watchDirectory?(path: string, callback: DirectoryWatcherCallback, recursive?: boolean): FileWatcher;
+    }
+    interface SetTypings extends ProjectResponse {
+        readonly typeAcquisition: TypeAcquisition;
+        readonly compilerOptions: CompilerOptions;
+        readonly typings: string[];
+        readonly unresolvedImports: SortedReadonlyArray<string>;
+        readonly kind: ActionSet;
+    }
+    type TypingInstallerResponseUnion = SetTypings | InvalidateCachedTypings | TypesRegistryResponse | PackageInstalledResponse | InstallTypes | InitializationFailedResponse;
+}
+declare namespace ts.JsTyping {
+    interface TypingResolutionHost {
+        directoryExists(path: string): boolean;
+        fileExists(fileName: string): boolean;
+        readFile(path: string, encoding?: string): string | undefined;
+        readDirectory(rootDir: string, extensions: ReadonlyArray<string>, excludes: ReadonlyArray<string> | undefined, includes: ReadonlyArray<string> | undefined, depth?: number): string[];
+    }
+    interface CachedTyping {
+        typingLocation: string;
+        version: Semver;
+    }
+    function isTypingUpToDate(cachedTyping: CachedTyping, availableTypingVersions: MapLike<string>): boolean;
+    const nodeCoreModuleList: ReadonlyArray<string>;
+    const nodeCoreModules: Map<true>;
+    /**
+     * A map of loose file names to library names that we are confident require typings
+     */
+    type SafeList = ReadonlyMap<string>;
+    function loadSafeList(host: TypingResolutionHost, safeListPath: Path): SafeList;
+    function loadTypesMap(host: TypingResolutionHost, typesMapPath: Path): SafeList | undefined;
+    /**
+     * @param host is the object providing I/O related operations.
+     * @param fileNames are the file names that belong to the same project
+     * @param projectRootPath is the path to the project root directory
+     * @param safeListPath is the path used to retrieve the safe list
+     * @param packageNameToTypingLocation is the map of package names to their cached typing locations and installed versions
+     * @param typeAcquisition is used to customize the typing acquisition process
+     * @param compilerOptions are used as a source for typing inference
+     */
+    function discoverTypings(host: TypingResolutionHost, log: ((message: string) => void) | undefined, fileNames: string[], projectRootPath: Path, safeList: SafeList, packageNameToTypingLocation: ReadonlyMap<CachedTyping>, typeAcquisition: TypeAcquisition, unresolvedImports: ReadonlyArray<string>, typesRegistry: ReadonlyMap<MapLike<string>>): {
+        cachedTypingPaths: string[];
+        newTypingNames: string[];
+        filesToWatch: string[];
+    };
+    enum PackageNameValidationResult {
+        Ok = 0,
+        ScopedPackagesNotSupported = 1,
+        EmptyName = 2,
+        NameTooLong = 3,
+        NameStartsWithDot = 4,
+        NameStartsWithUnderscore = 5,
+        NameContainsNonURISafeCharacters = 6
+    }
+    /**
+     * Validates package name using rules defined at https://docs.npmjs.com/files/package.json
+     */
+    function validatePackageName(packageName: string): PackageNameValidationResult;
+    function renderPackageNameValidationFailure(result: PackageNameValidationResult, typing: string): string;
+}
+declare namespace ts {
+    class Semver {
+        readonly major: number;
+        readonly minor: number;
+        readonly patch: number;
+        /**
+         * If true, this is `major.minor.0-next.patch`.
+         * If false, this is `major.minor.patch`.
+         */
+        readonly isPrerelease: boolean;
+        static parse(semver: string): Semver;
+        static fromRaw({ major, minor, patch, isPrerelease }: Semver): Semver;
+        private static tryParse;
+        private constructor();
+        readonly versionString: string;
+        equals(sem: Semver): boolean;
+        greaterThan(sem: Semver): boolean;
+    }
+}
+//# sourceMappingURL=jsTyping.d.ts.map
+declare namespace ts.server {
+    interface CompressedData {
+        length: number;
+        compressionKind: string;
+        data: any;
+    }
+    type RequireResult = {
+        module: {};
+        error: undefined;
+    } | {
+        module: undefined;
+        error: {
+            stack?: string;
+            message?: string;
+        };
+    };
+    interface ServerHost extends System {
+        watchFile(path: string, callback: FileWatcherCallback, pollingInterval?: number): FileWatcher;
+        watchDirectory(path: string, callback: DirectoryWatcherCallback, recursive?: boolean): FileWatcher;
+        setTimeout(callback: (...args: any[]) => void, ms: number, ...args: any[]): any;
+        clearTimeout(timeoutId: any): void;
+        setImmediate(callback: (...args: any[]) => void, ...args: any[]): any;
+        clearImmediate(timeoutId: any): void;
+        gc?(): void;
+        trace?(s: string): void;
+        require?(initialPath: string, moduleName: string): RequireResult;
+    }
+}
+declare namespace ts.server {
+    enum LogLevel {
+        terse = 0,
+        normal = 1,
+        requestTime = 2,
+        verbose = 3
+    }
+    const emptyArray: SortedReadonlyArray<never>;
+    interface Logger {
+        close(): void;
+        hasLevel(level: LogLevel): boolean;
+        loggingEnabled(): boolean;
+        perftrc(s: string): void;
+        info(s: string): void;
+        startGroup(): void;
+        endGroup(): void;
+        msg(s: string, type?: Msg): void;
+        getLogFileName(): string | undefined;
+    }
+    enum Msg {
+        Err = "Err",
+        Info = "Info",
+        Perf = "Perf"
+    }
+    namespace Msg {
+        type Types = Msg;
+    }
+    function createInstallTypingsRequest(project: Project, typeAcquisition: TypeAcquisition, unresolvedImports: SortedReadonlyArray<string>, cachePath?: string): DiscoverTypings;
+    namespace Errors {
+        function ThrowNoProject(): never;
+        function ThrowProjectLanguageServiceDisabled(): never;
+        function ThrowProjectDoesNotContainDocument(fileName: string, project: Project): never;
+    }
+    function getDefaultFormatCodeSettings(host: ServerHost): FormatCodeSettings;
+    type NormalizedPath = string & {
+        __normalizedPathTag: any;
+    };
+    function toNormalizedPath(fileName: string): NormalizedPath;
+    function normalizedPathToPath(normalizedPath: NormalizedPath, currentDirectory: string, getCanonicalFileName: (f: string) => string): Path;
+    function asNormalizedPath(fileName: string): NormalizedPath;
+    interface NormalizedPathMap<T> {
+        get(path: NormalizedPath): T | undefined;
+        set(path: NormalizedPath, value: T): void;
+        contains(path: NormalizedPath): boolean;
+        remove(path: NormalizedPath): void;
+    }
+    function createNormalizedPathMap<T>(): NormalizedPathMap<T>;
+    interface ProjectOptions {
+        configHasExtendsProperty: boolean;
+        configHasFilesProperty: boolean;
+        configHasIncludeProperty: boolean;
+        configHasExcludeProperty: boolean;
+        projectReferences: ReadonlyArray<ProjectReference> | undefined;
+        files?: string[];
+        wildcardDirectories?: Map<WatchDirectoryFlags>;
+        compilerOptions?: CompilerOptions;
+        typeAcquisition?: TypeAcquisition;
+        compileOnSave?: boolean;
+    }
+    function isInferredProjectName(name: string): boolean;
+    function makeInferredProjectName(counter: number): string;
+    function createSortedArray<T>(): SortedArray<T>;
+}
+declare namespace ts.server {
+    class ThrottledOperations {
+        private readonly host;
+        private readonly pendingTimeouts;
+        private readonly logger?;
+        constructor(host: ServerHost, logger: Logger);
+        schedule(operationId: string, delay: number, cb: () => void): void;
+        private static run;
+    }
+    class GcTimer {
+        private readonly host;
+        private readonly delay;
+        private readonly logger;
+        private timerId;
+        constructor(host: ServerHost, delay: number, logger: Logger);
+        scheduleCollect(): void;
+        private static run;
+    }
+    function getBaseConfigFileName(configFilePath: NormalizedPath): "tsconfig.json" | "jsconfig.json" | undefined;
+    function removeSorted<T>(array: SortedArray<T>, remove: T, compare: Comparer<T>): void;
+    function toSortedArray(arr: string[]): SortedArray<string>;
+    function toSortedArray<T>(arr: T[], comparer: Comparer<T>): SortedArray<T>;
+    function toDeduplicatedSortedArray(arr: string[]): SortedArray<string>;
+    function indent(str: string): string;
+    function stringifyIndented(json: {}): string;
+}
+declare namespace ts.server.protocol {
+    enum CommandTypes {
+        JsxClosingTag = "jsxClosingTag",
+        Brace = "brace",
+        BraceFull = "brace-full",
+        BraceCompletion = "braceCompletion",
+        GetSpanOfEnclosingComment = "getSpanOfEnclosingComment",
+        Change = "change",
+        Close = "close",
+        Completions = "completions",
+        CompletionsFull = "completions-full",
+        CompletionDetails = "completionEntryDetails",
+        CompletionDetailsFull = "completionEntryDetails-full",
+        CompileOnSaveAffectedFileList = "compileOnSaveAffectedFileList",
+        CompileOnSaveEmitFile = "compileOnSaveEmitFile",
+        Configure = "configure",
+        Definition = "definition",
+        DefinitionFull = "definition-full",
+        DefinitionAndBoundSpan = "definitionAndBoundSpan",
+        DefinitionAndBoundSpanFull = "definitionAndBoundSpan-full",
+        Implementation = "implementation",
+        ImplementationFull = "implementation-full",
+        Exit = "exit",
+        Format = "format",
+        Formatonkey = "formatonkey",
+        FormatFull = "format-full",
+        FormatonkeyFull = "formatonkey-full",
+        FormatRangeFull = "formatRange-full",
+        Geterr = "geterr",
+        GeterrForProject = "geterrForProject",
+        SemanticDiagnosticsSync = "semanticDiagnosticsSync",
+        SyntacticDiagnosticsSync = "syntacticDiagnosticsSync",
+        SuggestionDiagnosticsSync = "suggestionDiagnosticsSync",
+        NavBar = "navbar",
+        NavBarFull = "navbar-full",
+        Navto = "navto",
+        NavtoFull = "navto-full",
+        NavTree = "navtree",
+        NavTreeFull = "navtree-full",
+        Occurrences = "occurrences",
+        DocumentHighlights = "documentHighlights",
+        DocumentHighlightsFull = "documentHighlights-full",
+        Open = "open",
+        Quickinfo = "quickinfo",
+        QuickinfoFull = "quickinfo-full",
+        References = "references",
+        ReferencesFull = "references-full",
+        Reload = "reload",
+        Rename = "rename",
+        RenameInfoFull = "rename-full",
+        RenameLocationsFull = "renameLocations-full",
+        Saveto = "saveto",
+        SignatureHelp = "signatureHelp",
+        SignatureHelpFull = "signatureHelp-full",
+        Status = "status",
+        TypeDefinition = "typeDefinition",
+        ProjectInfo = "projectInfo",
+        ReloadProjects = "reloadProjects",
+        Unknown = "unknown",
+        OpenExternalProject = "openExternalProject",
+        OpenExternalProjects = "openExternalProjects",
+        CloseExternalProject = "closeExternalProject",
+        SynchronizeProjectList = "synchronizeProjectList",
+        ApplyChangedToOpenFiles = "applyChangedToOpenFiles",
+        EncodedSemanticClassificationsFull = "encodedSemanticClassifications-full",
+        Cleanup = "cleanup",
+        GetOutliningSpans = "getOutliningSpans",
+        GetOutliningSpansFull = "outliningSpans",
+        TodoComments = "todoComments",
+        Indentation = "indentation",
+        DocCommentTemplate = "docCommentTemplate",
+        CompilerOptionsDiagnosticsFull = "compilerOptionsDiagnostics-full",
+        NameOrDottedNameSpan = "nameOrDottedNameSpan",
+        BreakpointStatement = "breakpointStatement",
+        CompilerOptionsForInferredProjects = "compilerOptionsForInferredProjects",
+        GetCodeFixes = "getCodeFixes",
+        GetCodeFixesFull = "getCodeFixes-full",
+        GetCombinedCodeFix = "getCombinedCodeFix",
+        GetCombinedCodeFixFull = "getCombinedCodeFix-full",
+        ApplyCodeActionCommand = "applyCodeActionCommand",
+        GetSupportedCodeFixes = "getSupportedCodeFixes",
+        GetApplicableRefactors = "getApplicableRefactors",
+        GetEditsForRefactor = "getEditsForRefactor",
+        GetEditsForRefactorFull = "getEditsForRefactor-full",
+        OrganizeImports = "organizeImports",
+        OrganizeImportsFull = "organizeImports-full",
+        GetEditsForFileRename = "getEditsForFileRename",
+        GetEditsForFileRenameFull = "getEditsForFileRename-full"
+    }
+    interface Message {
+        seq: number;
+        type: "request" | "response" | "event";
+    }
+    interface Request extends Message {
+        type: "request";
+        command: string;
+        arguments?: any;
+    }
+    interface ReloadProjectsRequest extends Message {
+        command: CommandTypes.ReloadProjects;
+    }
+    interface Event extends Message {
+        type: "event";
+        event: string;
+        body?: any;
+    }
+    interface Response extends Message {
+        type: "response";
+        request_seq: number;
+        success: boolean;
+        command: string;
+        message?: string;
+        body?: any;
+    }
+    interface FileRequestArgs {
+        file: string;
+        projectFileName?: string;
+    }
+    interface StatusRequest extends Request {
+        command: CommandTypes.Status;
+    }
+    interface StatusResponseBody {
+        version: string;
+    }
+    interface StatusResponse extends Response {
+        body: StatusResponseBody;
+    }
+    interface DocCommentTemplateRequest extends FileLocationRequest {
+        command: CommandTypes.DocCommentTemplate;
+    }
+    interface DocCommandTemplateResponse extends Response {
+        body?: TextInsertion;
+    }
+    interface TodoCommentRequest extends FileRequest {
+        command: CommandTypes.TodoComments;
+        arguments: TodoCommentRequestArgs;
+    }
+    interface TodoCommentRequestArgs extends FileRequestArgs {
+        descriptors: TodoCommentDescriptor[];
+    }
+    interface TodoCommentsResponse extends Response {
+        body?: TodoComment[];
+    }
+    interface SpanOfEnclosingCommentRequest extends FileLocationRequest {
+        command: CommandTypes.GetSpanOfEnclosingComment;
+        arguments: SpanOfEnclosingCommentRequestArgs;
+    }
+    interface SpanOfEnclosingCommentRequestArgs extends FileLocationRequestArgs {
+        onlyMultiLine: boolean;
+    }
+    interface OutliningSpansRequest extends FileRequest {
+        command: CommandTypes.GetOutliningSpans;
+    }
+    interface OutliningSpan {
+        textSpan: TextSpan;
+        hintSpan: TextSpan;
+        bannerText: string;
+        autoCollapse: boolean;
+        kind: OutliningSpanKind;
+    }
+    interface OutliningSpansResponse extends Response {
+        body?: OutliningSpan[];
+    }
+    interface OutliningSpansRequestFull extends FileRequest {
+        command: CommandTypes.GetOutliningSpansFull;
+    }
+    interface OutliningSpansResponseFull extends Response {
+        body?: ts.OutliningSpan[];
+    }
+    interface IndentationRequest extends FileLocationRequest {
+        command: CommandTypes.Indentation;
+        arguments: IndentationRequestArgs;
+    }
+    interface IndentationResponse extends Response {
+        body?: IndentationResult;
+    }
+    interface IndentationResult {
+        position: number;
+        indentation: number;
+    }
+    interface IndentationRequestArgs extends FileLocationRequestArgs {
+        options?: EditorSettings;
+    }
+    interface ProjectInfoRequestArgs extends FileRequestArgs {
+        needFileNameList: boolean;
+    }
+    interface ProjectInfoRequest extends Request {
+        command: CommandTypes.ProjectInfo;
+        arguments: ProjectInfoRequestArgs;
+    }
+    interface CompilerOptionsDiagnosticsRequest extends Request {
+        arguments: CompilerOptionsDiagnosticsRequestArgs;
+    }
+    interface CompilerOptionsDiagnosticsRequestArgs {
+        projectFileName: string;
+    }
+    interface ProjectInfo {
+        configFileName: string;
+        fileNames?: string[];
+        languageServiceDisabled?: boolean;
+    }
+    interface DiagnosticWithLinePosition {
+        message: string;
+        start: number;
+        length: number;
+        startLocation: Location;
+        endLocation: Location;
+        category: string;
+        code: number;
+        reportsUnnecessary?: {};
+    }
+    interface ProjectInfoResponse extends Response {
+        body?: ProjectInfo;
+    }
+    interface FileRequest extends Request {
+        arguments: FileRequestArgs;
+    }
+    interface FileLocationRequestArgs extends FileRequestArgs {
+        line: number;
+        offset: number;
+        position?: number;
+    }
+    type FileLocationOrRangeRequestArgs = FileLocationRequestArgs | FileRangeRequestArgs;
+    interface GetApplicableRefactorsRequest extends Request {
+        command: CommandTypes.GetApplicableRefactors;
+        arguments: GetApplicableRefactorsRequestArgs;
+    }
+    type GetApplicableRefactorsRequestArgs = FileLocationOrRangeRequestArgs;
+    interface GetApplicableRefactorsResponse extends Response {
+        body?: ApplicableRefactorInfo[];
+    }
+    interface ApplicableRefactorInfo {
+        name: string;
+        description: string;
+        inlineable?: boolean;
+        actions: RefactorActionInfo[];
+    }
+    interface RefactorActionInfo {
+        name: string;
+        description: string;
+    }
+    interface GetEditsForRefactorRequest extends Request {
+        command: CommandTypes.GetEditsForRefactor;
+        arguments: GetEditsForRefactorRequestArgs;
+    }
+    type GetEditsForRefactorRequestArgs = FileLocationOrRangeRequestArgs & {
+        refactor: string;
+        action: string;
+    };
+    interface GetEditsForRefactorResponse extends Response {
+        body?: RefactorEditInfo;
+    }
+    interface RefactorEditInfo {
+        edits: FileCodeEdits[];
+        renameLocation?: Location;
+        renameFilename?: string;
+    }
+    interface OrganizeImportsRequest extends Request {
+        command: CommandTypes.OrganizeImports;
+        arguments: OrganizeImportsRequestArgs;
+    }
+    type OrganizeImportsScope = GetCombinedCodeFixScope;
+    interface OrganizeImportsRequestArgs {
+        scope: OrganizeImportsScope;
+    }
+    interface OrganizeImportsResponse extends Response {
+        edits: ReadonlyArray<FileCodeEdits>;
+    }
+    interface GetEditsForFileRenameRequest extends Request {
+        command: CommandTypes.GetEditsForFileRename;
+        arguments: GetEditsForFileRenameRequestArgs;
+    }
+    interface GetEditsForFileRenameRequestArgs extends FileRequestArgs {
+        readonly oldFilePath: string;
+        readonly newFilePath: string;
+    }
+    interface GetEditsForFileRenameResponse extends Response {
+        edits: ReadonlyArray<FileCodeEdits>;
+    }
+    interface CodeFixRequest extends Request {
+        command: CommandTypes.GetCodeFixes;
+        arguments: CodeFixRequestArgs;
+    }
+    interface GetCombinedCodeFixRequest extends Request {
+        command: CommandTypes.GetCombinedCodeFix;
+        arguments: GetCombinedCodeFixRequestArgs;
+    }
+    interface GetCombinedCodeFixResponse extends Response {
+        body: CombinedCodeActions;
+    }
+    interface ApplyCodeActionCommandRequest extends Request {
+        command: CommandTypes.ApplyCodeActionCommand;
+        arguments: ApplyCodeActionCommandRequestArgs;
+    }
+    interface ApplyCodeActionCommandResponse extends Response {
+    }
+    interface FileRangeRequestArgs extends FileRequestArgs {
+        startLine: number;
+        startOffset: number;
+        startPosition?: number;
+        endLine: number;
+        endOffset: number;
+        endPosition?: number;
+    }
+    interface CodeFixRequestArgs extends FileRangeRequestArgs {
+        errorCodes?: ReadonlyArray<number>;
+    }
+    interface GetCombinedCodeFixRequestArgs {
+        scope: GetCombinedCodeFixScope;
+        fixId: {};
+    }
+    interface GetCombinedCodeFixScope {
+        type: "file";
+        args: FileRequestArgs;
+    }
+    interface ApplyCodeActionCommandRequestArgs {
+        command: {};
+    }
+    interface GetCodeFixesResponse extends Response {
+        body?: CodeAction[];
+    }
+    interface FileLocationRequest extends FileRequest {
+        arguments: FileLocationRequestArgs;
+    }
+    interface GetSupportedCodeFixesRequest extends Request {
+        command: CommandTypes.GetSupportedCodeFixes;
+    }
+    interface GetSupportedCodeFixesResponse extends Response {
+        body?: string[];
+    }
+    interface EncodedSemanticClassificationsRequest extends FileRequest {
+        arguments: EncodedSemanticClassificationsRequestArgs;
+    }
+    interface EncodedSemanticClassificationsRequestArgs extends FileRequestArgs {
+        start: number;
+        length: number;
+    }
+    interface DocumentHighlightsRequestArgs extends FileLocationRequestArgs {
+        filesToSearch: string[];
+    }
+    interface DefinitionRequest extends FileLocationRequest {
+        command: CommandTypes.Definition;
+    }
+    interface TypeDefinitionRequest extends FileLocationRequest {
+        command: CommandTypes.TypeDefinition;
+    }
+    interface ImplementationRequest extends FileLocationRequest {
+        command: CommandTypes.Implementation;
+    }
+    interface Location {
+        line: number;
+        offset: number;
+    }
+    interface TextSpan {
+        start: Location;
+        end: Location;
+    }
+    interface FileSpan extends TextSpan {
+        file: string;
+    }
+    interface DefinitionInfoAndBoundSpan {
+        definitions: ReadonlyArray<FileSpan>;
+        textSpan: TextSpan;
+    }
+    interface DefinitionResponse extends Response {
+        body?: FileSpan[];
+    }
+    interface DefinitionInfoAndBoundSpanReponse extends Response {
+        body?: DefinitionInfoAndBoundSpan;
+    }
+    interface TypeDefinitionResponse extends Response {
+        body?: FileSpan[];
+    }
+    interface ImplementationResponse extends Response {
+        body?: FileSpan[];
+    }
+    interface BraceCompletionRequest extends FileLocationRequest {
+        command: CommandTypes.BraceCompletion;
+        arguments: BraceCompletionRequestArgs;
+    }
+    interface BraceCompletionRequestArgs extends FileLocationRequestArgs {
+        openingBrace: string;
+    }
+    interface JsxClosingTagRequest extends FileLocationRequest {
+        readonly command: CommandTypes.JsxClosingTag;
+        readonly arguments: JsxClosingTagRequestArgs;
+    }
+    interface JsxClosingTagRequestArgs extends FileLocationRequestArgs {
+    }
+    interface JsxClosingTagResponse extends Response {
+        readonly body: TextInsertion;
+    }
+    interface OccurrencesRequest extends FileLocationRequest {
+        command: CommandTypes.Occurrences;
+    }
+    interface OccurrencesResponseItem extends FileSpan {
+        isWriteAccess: boolean;
+        isInString?: true;
+    }
+    interface OccurrencesResponse extends Response {
+        body?: OccurrencesResponseItem[];
+    }
+    interface DocumentHighlightsRequest extends FileLocationRequest {
+        command: CommandTypes.DocumentHighlights;
+        arguments: DocumentHighlightsRequestArgs;
+    }
+    interface HighlightSpan extends TextSpan {
+        kind: HighlightSpanKind;
+    }
+    interface DocumentHighlightsItem {
+        file: string;
+        highlightSpans: HighlightSpan[];
+    }
+    interface DocumentHighlightsResponse extends Response {
+        body?: DocumentHighlightsItem[];
+    }
+    interface ReferencesRequest extends FileLocationRequest {
+        command: CommandTypes.References;
+    }
+    interface ReferencesResponseItem extends FileSpan {
+        lineText: string;
+        isWriteAccess: boolean;
+        isDefinition: boolean;
+    }
+    interface ReferencesResponseBody {
+        refs: ReferencesResponseItem[];
+        symbolName: string;
+        symbolStartOffset: number;
+        symbolDisplayString: string;
+    }
+    interface ReferencesResponse extends Response {
+        body?: ReferencesResponseBody;
+    }
+    interface RenameRequestArgs extends FileLocationRequestArgs {
+        findInComments?: boolean;
+        findInStrings?: boolean;
+    }
+    interface RenameRequest extends FileLocationRequest {
+        command: CommandTypes.Rename;
+        arguments: RenameRequestArgs;
+    }
+    interface RenameInfo {
+        canRename: boolean;
+        localizedErrorMessage?: string;
+        displayName: string;
+        fullDisplayName: string;
+        kind: ScriptElementKind;
+        kindModifiers: string;
+    }
+    interface SpanGroup {
+        file: string;
+        locs: TextSpan[];
+    }
+    interface RenameResponseBody {
+        info: RenameInfo;
+        locs: ReadonlyArray<SpanGroup>;
+    }
+    interface RenameResponse extends Response {
+        body?: RenameResponseBody;
+    }
+    interface ExternalFile {
+        fileName: string;
+        scriptKind?: ScriptKindName | ts.ScriptKind;
+        hasMixedContent?: boolean;
+        content?: string;
+    }
+    interface ExternalProject {
+        projectFileName: string;
+        rootFiles: ExternalFile[];
+        options: ExternalProjectCompilerOptions;
+        typingOptions?: TypeAcquisition;
+        typeAcquisition?: TypeAcquisition;
+    }
+    interface CompileOnSaveMixin {
+        compileOnSave?: boolean;
+    }
+    type ExternalProjectCompilerOptions = CompilerOptions & CompileOnSaveMixin;
+    interface ProjectVersionInfo {
+        projectName: string;
+        isInferred: boolean;
+        version: number;
+        options: ts.CompilerOptions;
+        languageServiceDisabled: boolean;
+        lastFileExceededProgramSize?: string;
+    }
+    interface ProjectChanges {
+        added: string[];
+        removed: string[];
+        updated: string[];
+    }
+    interface ProjectFiles {
+        info?: ProjectVersionInfo;
+        files?: string[];
+        changes?: ProjectChanges;
+    }
+    interface ProjectFilesWithDiagnostics extends ProjectFiles {
+        projectErrors: DiagnosticWithLinePosition[];
+    }
+    interface ChangedOpenFile {
+        fileName: string;
+        changes: ts.TextChange[];
+    }
+    interface ConfigureRequestArguments {
+        hostInfo?: string;
+        file?: string;
+        formatOptions?: FormatCodeSettings;
+        preferences?: UserPreferences;
+        extraFileExtensions?: FileExtensionInfo[];
+    }
+    interface ConfigureRequest extends Request {
+        command: CommandTypes.Configure;
+        arguments: ConfigureRequestArguments;
+    }
+    interface ConfigureResponse extends Response {
+    }
+    interface OpenRequestArgs extends FileRequestArgs {
+        fileContent?: string;
+        scriptKindName?: ScriptKindName;
+        projectRootPath?: string;
+    }
+    type ScriptKindName = "TS" | "JS" | "TSX" | "JSX";
+    interface OpenRequest extends Request {
+        command: CommandTypes.Open;
+        arguments: OpenRequestArgs;
+    }
+    interface OpenExternalProjectRequest extends Request {
+        command: CommandTypes.OpenExternalProject;
+        arguments: OpenExternalProjectArgs;
+    }
+    type OpenExternalProjectArgs = ExternalProject;
+    interface OpenExternalProjectsRequest extends Request {
+        command: CommandTypes.OpenExternalProjects;
+        arguments: OpenExternalProjectsArgs;
+    }
+    interface OpenExternalProjectsArgs {
+        projects: ExternalProject[];
+    }
+    interface OpenExternalProjectResponse extends Response {
+    }
+    interface OpenExternalProjectsResponse extends Response {
+    }
+    interface CloseExternalProjectRequest extends Request {
+        command: CommandTypes.CloseExternalProject;
+        arguments: CloseExternalProjectRequestArgs;
+    }
+    interface CloseExternalProjectRequestArgs {
+        projectFileName: string;
+    }
+    interface CloseExternalProjectResponse extends Response {
+    }
+    interface SynchronizeProjectListRequest extends Request {
+        arguments: SynchronizeProjectListRequestArgs;
+    }
+    interface SynchronizeProjectListRequestArgs {
+        knownProjects: protocol.ProjectVersionInfo[];
+    }
+    interface ApplyChangedToOpenFilesRequest extends Request {
+        arguments: ApplyChangedToOpenFilesRequestArgs;
+    }
+    interface ApplyChangedToOpenFilesRequestArgs {
+        openFiles?: ExternalFile[];
+        changedFiles?: ChangedOpenFile[];
+        closedFiles?: string[];
+    }
+    interface SetCompilerOptionsForInferredProjectsRequest extends Request {
+        command: CommandTypes.CompilerOptionsForInferredProjects;
+        arguments: SetCompilerOptionsForInferredProjectsArgs;
+    }
+    interface SetCompilerOptionsForInferredProjectsArgs {
+        options: ExternalProjectCompilerOptions;
+        projectRootPath?: string;
+    }
+    interface SetCompilerOptionsForInferredProjectsResponse extends Response {
+    }
+    interface ExitRequest extends Request {
+        command: CommandTypes.Exit;
+    }
+    interface CloseRequest extends FileRequest {
+        command: CommandTypes.Close;
+    }
+    interface CompileOnSaveAffectedFileListRequest extends FileRequest {
+        command: CommandTypes.CompileOnSaveAffectedFileList;
+    }
+    interface CompileOnSaveAffectedFileListSingleProject {
+        projectFileName: string;
+        fileNames: string[];
+        projectUsesOutFile: boolean;
+    }
+    interface CompileOnSaveAffectedFileListResponse extends Response {
+        body: CompileOnSaveAffectedFileListSingleProject[];
+    }
+    interface CompileOnSaveEmitFileRequest extends FileRequest {
+        command: CommandTypes.CompileOnSaveEmitFile;
+        arguments: CompileOnSaveEmitFileRequestArgs;
+    }
+    interface CompileOnSaveEmitFileRequestArgs extends FileRequestArgs {
+        forced?: boolean;
+    }
+    interface QuickInfoRequest extends FileLocationRequest {
+        command: CommandTypes.Quickinfo;
+    }
+    interface QuickInfoResponseBody {
+        kind: ScriptElementKind;
+        kindModifiers: string;
+        start: Location;
+        end: Location;
+        displayString: string;
+        documentation: string;
+        tags: JSDocTagInfo[];
+    }
+    interface QuickInfoResponse extends Response {
+        body?: QuickInfoResponseBody;
+    }
+    interface FormatRequestArgs extends FileLocationRequestArgs {
+        endLine: number;
+        endOffset: number;
+        endPosition?: number;
+        options?: FormatCodeSettings;
+    }
+    interface FormatRequest extends FileLocationRequest {
+        command: CommandTypes.Format;
+        arguments: FormatRequestArgs;
+    }
+    interface CodeEdit {
+        start: Location;
+        end: Location;
+        newText: string;
+    }
+    interface FileCodeEdits {
+        fileName: string;
+        textChanges: CodeEdit[];
+    }
+    interface CodeFixResponse extends Response {
+        body?: CodeFixAction[];
+    }
+    interface CodeAction {
+        description: string;
+        changes: FileCodeEdits[];
+        commands?: {}[];
+    }
+    interface CombinedCodeActions {
+        changes: ReadonlyArray<FileCodeEdits>;
+        commands?: ReadonlyArray<{}>;
+    }
+    interface CodeFixAction extends CodeAction {
+        fixName: string;
+        fixId?: {};
+        fixAllDescription?: string;
+    }
+    interface FormatResponse extends Response {
+        body?: CodeEdit[];
+    }
+    interface FormatOnKeyRequestArgs extends FileLocationRequestArgs {
+        key: string;
+        options?: FormatCodeSettings;
+    }
+    interface FormatOnKeyRequest extends FileLocationRequest {
+        command: CommandTypes.Formatonkey;
+        arguments: FormatOnKeyRequestArgs;
+    }
+    type CompletionsTriggerCharacter = "." | '"' | "'" | "`" | "/" | "@" | "<";
+    interface CompletionsRequestArgs extends FileLocationRequestArgs {
+        prefix?: string;
+        triggerCharacter?: CompletionsTriggerCharacter;
+        includeExternalModuleExports?: boolean;
+        includeInsertTextCompletions?: boolean;
+    }
+    interface CompletionsRequest extends FileLocationRequest {
+        command: CommandTypes.Completions;
+        arguments: CompletionsRequestArgs;
+    }
+    interface CompletionDetailsRequestArgs extends FileLocationRequestArgs {
+        entryNames: (string | CompletionEntryIdentifier)[];
+    }
+    interface CompletionEntryIdentifier {
+        name: string;
+        source?: string;
+    }
+    interface CompletionDetailsRequest extends FileLocationRequest {
+        command: CommandTypes.CompletionDetails;
+        arguments: CompletionDetailsRequestArgs;
+    }
+    interface SymbolDisplayPart {
+        text: string;
+        kind: string;
+    }
+    interface CompletionEntry {
+        name: string;
+        kind: ScriptElementKind;
+        kindModifiers?: string;
+        sortText: string;
+        insertText?: string;
+        replacementSpan?: TextSpan;
+        hasAction?: true;
+        source?: string;
+        isRecommended?: true;
+    }
+    interface CompletionEntryDetails {
+        name: string;
+        kind: ScriptElementKind;
+        kindModifiers: string;
+        displayParts: SymbolDisplayPart[];
+        documentation?: SymbolDisplayPart[];
+        tags?: JSDocTagInfo[];
+        codeActions?: CodeAction[];
+        source?: SymbolDisplayPart[];
+    }
+    interface CompletionsResponse extends Response {
+        body?: CompletionEntry[];
+    }
+    interface CompletionDetailsResponse extends Response {
+        body?: CompletionEntryDetails[];
+    }
+    interface SignatureHelpParameter {
+        name: string;
+        documentation: SymbolDisplayPart[];
+        displayParts: SymbolDisplayPart[];
+        isOptional: boolean;
+    }
+    interface SignatureHelpItem {
+        isVariadic: boolean;
+        prefixDisplayParts: SymbolDisplayPart[];
+        suffixDisplayParts: SymbolDisplayPart[];
+        separatorDisplayParts: SymbolDisplayPart[];
+        parameters: SignatureHelpParameter[];
+        documentation: SymbolDisplayPart[];
+        tags: JSDocTagInfo[];
+    }
+    interface SignatureHelpItems {
+        items: SignatureHelpItem[];
+        applicableSpan: TextSpan;
+        selectedItemIndex: number;
+        argumentIndex: number;
+        argumentCount: number;
+    }
+    interface SignatureHelpRequestArgs extends FileLocationRequestArgs {
+    }
+    interface SignatureHelpRequest extends FileLocationRequest {
+        command: CommandTypes.SignatureHelp;
+        arguments: SignatureHelpRequestArgs;
+    }
+    interface SignatureHelpResponse extends Response {
+        body?: SignatureHelpItems;
+    }
+    interface SemanticDiagnosticsSyncRequest extends FileRequest {
+        command: CommandTypes.SemanticDiagnosticsSync;
+        arguments: SemanticDiagnosticsSyncRequestArgs;
+    }
+    interface SemanticDiagnosticsSyncRequestArgs extends FileRequestArgs {
+        includeLinePosition?: boolean;
+    }
+    interface SemanticDiagnosticsSyncResponse extends Response {
+        body?: Diagnostic[] | DiagnosticWithLinePosition[];
+    }
+    interface SuggestionDiagnosticsSyncRequest extends FileRequest {
+        command: CommandTypes.SuggestionDiagnosticsSync;
+        arguments: SuggestionDiagnosticsSyncRequestArgs;
+    }
+    type SuggestionDiagnosticsSyncRequestArgs = SemanticDiagnosticsSyncRequestArgs;
+    type SuggestionDiagnosticsSyncResponse = SemanticDiagnosticsSyncResponse;
+    interface SyntacticDiagnosticsSyncRequest extends FileRequest {
+        command: CommandTypes.SyntacticDiagnosticsSync;
+        arguments: SyntacticDiagnosticsSyncRequestArgs;
+    }
+    interface SyntacticDiagnosticsSyncRequestArgs extends FileRequestArgs {
+        includeLinePosition?: boolean;
+    }
+    interface SyntacticDiagnosticsSyncResponse extends Response {
+        body?: Diagnostic[] | DiagnosticWithLinePosition[];
+    }
+    interface GeterrForProjectRequestArgs {
+        file: string;
+        delay: number;
+    }
+    interface GeterrForProjectRequest extends Request {
+        command: CommandTypes.GeterrForProject;
+        arguments: GeterrForProjectRequestArgs;
+    }
+    interface GeterrRequestArgs {
+        files: string[];
+        delay: number;
+    }
+    interface GeterrRequest extends Request {
+        command: CommandTypes.Geterr;
+        arguments: GeterrRequestArgs;
+    }
+    type RequestCompletedEventName = "requestCompleted";
+    interface RequestCompletedEvent extends Event {
+        event: RequestCompletedEventName;
+        body: RequestCompletedEventBody;
+    }
+    interface RequestCompletedEventBody {
+        request_seq: number;
+    }
+    interface Diagnostic {
+        start: Location;
+        end: Location;
+        text: string;
+        category: string;
+        reportsUnnecessary?: {};
+        code?: number;
+        source?: string;
+    }
+    interface DiagnosticWithFileName extends Diagnostic {
+        fileName: string;
+    }
+    interface DiagnosticEventBody {
+        file: string;
+        diagnostics: Diagnostic[];
+    }
+    type DiagnosticEventKind = "semanticDiag" | "syntaxDiag" | "suggestionDiag";
+    interface DiagnosticEvent extends Event {
+        body?: DiagnosticEventBody;
+    }
+    interface ConfigFileDiagnosticEventBody {
+        triggerFile: string;
+        configFile: string;
+        diagnostics: DiagnosticWithFileName[];
+    }
+    interface ConfigFileDiagnosticEvent extends Event {
+        body?: ConfigFileDiagnosticEventBody;
+        event: "configFileDiag";
+    }
+    type ProjectLanguageServiceStateEventName = "projectLanguageServiceState";
+    interface ProjectLanguageServiceStateEvent extends Event {
+        event: ProjectLanguageServiceStateEventName;
+        body?: ProjectLanguageServiceStateEventBody;
+    }
+    interface ProjectLanguageServiceStateEventBody {
+        projectName: string;
+        languageServiceEnabled: boolean;
+    }
+    type ProjectsUpdatedInBackgroundEventName = "projectsUpdatedInBackground";
+    interface ProjectsUpdatedInBackgroundEvent extends Event {
+        event: ProjectsUpdatedInBackgroundEventName;
+        body: ProjectsUpdatedInBackgroundEventBody;
+    }
+    interface ProjectsUpdatedInBackgroundEventBody {
+        openFiles: string[];
+    }
+    interface ReloadRequestArgs extends FileRequestArgs {
+        tmpfile: string;
+    }
+    interface ReloadRequest extends FileRequest {
+        command: CommandTypes.Reload;
+        arguments: ReloadRequestArgs;
+    }
+    interface ReloadResponse extends Response {
+    }
+    interface SavetoRequestArgs extends FileRequestArgs {
+        tmpfile: string;
+    }
+    interface SavetoRequest extends FileRequest {
+        command: CommandTypes.Saveto;
+        arguments: SavetoRequestArgs;
+    }
+    interface NavtoRequestArgs extends FileRequestArgs {
+        searchValue: string;
+        maxResultCount?: number;
+        currentFileOnly?: boolean;
+        projectFileName?: string;
+    }
+    interface NavtoRequest extends FileRequest {
+        command: CommandTypes.Navto;
+        arguments: NavtoRequestArgs;
+    }
+    interface NavtoItem {
+        name: string;
+        kind: ScriptElementKind;
+        matchKind?: string;
+        isCaseSensitive?: boolean;
+        kindModifiers?: string;
+        file: string;
+        start: Location;
+        end: Location;
+        containerName?: string;
+        containerKind?: ScriptElementKind;
+    }
+    interface NavtoResponse extends Response {
+        body?: NavtoItem[];
+    }
+    interface ChangeRequestArgs extends FormatRequestArgs {
+        insertString?: string;
+    }
+    interface ChangeRequest extends FileLocationRequest {
+        command: CommandTypes.Change;
+        arguments: ChangeRequestArgs;
+    }
+    interface BraceResponse extends Response {
+        body?: TextSpan[];
+    }
+    interface BraceRequest extends FileLocationRequest {
+        command: CommandTypes.Brace;
+    }
+    interface NavBarRequest extends FileRequest {
+        command: CommandTypes.NavBar;
+    }
+    interface NavTreeRequest extends FileRequest {
+        command: CommandTypes.NavTree;
+    }
+    interface NavigationBarItem {
+        text: string;
+        kind: ScriptElementKind;
+        kindModifiers?: string;
+        spans: TextSpan[];
+        childItems?: NavigationBarItem[];
+        indent: number;
+    }
+    interface NavigationTree {
+        text: string;
+        kind: ScriptElementKind;
+        kindModifiers: string;
+        spans: TextSpan[];
+        nameSpan: TextSpan | undefined;
+        childItems?: NavigationTree[];
+    }
+    type TelemetryEventName = "telemetry";
+    interface TelemetryEvent extends Event {
+        event: TelemetryEventName;
+        body: TelemetryEventBody;
+    }
+    interface TelemetryEventBody {
+        telemetryEventName: string;
+        payload: any;
+    }
+    type TypesInstallerInitializationFailedEventName = "typesInstallerInitializationFailed";
+    interface TypesInstallerInitializationFailedEvent extends Event {
+        event: TypesInstallerInitializationFailedEventName;
+        body: TypesInstallerInitializationFailedEventBody;
+    }
+    interface TypesInstallerInitializationFailedEventBody {
+        message: string;
+    }
+    type TypingsInstalledTelemetryEventName = "typingsInstalled";
+    interface TypingsInstalledTelemetryEventBody extends TelemetryEventBody {
+        telemetryEventName: TypingsInstalledTelemetryEventName;
+        payload: TypingsInstalledTelemetryEventPayload;
+    }
+    interface TypingsInstalledTelemetryEventPayload {
+        installedPackages: string;
+        installSuccess: boolean;
+        typingsInstallerVersion: string;
+    }
+    type BeginInstallTypesEventName = "beginInstallTypes";
+    type EndInstallTypesEventName = "endInstallTypes";
+    interface BeginInstallTypesEvent extends Event {
+        event: BeginInstallTypesEventName;
+        body: BeginInstallTypesEventBody;
+    }
+    interface EndInstallTypesEvent extends Event {
+        event: EndInstallTypesEventName;
+        body: EndInstallTypesEventBody;
+    }
+    interface InstallTypesEventBody {
+        eventId: number;
+        packages: ReadonlyArray<string>;
+    }
+    interface BeginInstallTypesEventBody extends InstallTypesEventBody {
+    }
+    interface EndInstallTypesEventBody extends InstallTypesEventBody {
+        success: boolean;
+    }
+    interface NavBarResponse extends Response {
+        body?: NavigationBarItem[];
+    }
+    interface NavTreeResponse extends Response {
+        body?: NavigationTree;
+    }
+    enum IndentStyle {
+        None = "None",
+        Block = "Block",
+        Smart = "Smart"
+    }
+    interface EditorSettings {
+        baseIndentSize?: number;
+        indentSize?: number;
+        tabSize?: number;
+        newLineCharacter?: string;
+        convertTabsToSpaces?: boolean;
+        indentStyle?: IndentStyle | ts.IndentStyle;
+    }
+    interface FormatCodeSettings extends EditorSettings {
+        insertSpaceAfterCommaDelimiter?: boolean;
+        insertSpaceAfterSemicolonInForStatements?: boolean;
+        insertSpaceBeforeAndAfterBinaryOperators?: boolean;
+        insertSpaceAfterConstructor?: boolean;
+        insertSpaceAfterKeywordsInControlFlowStatements?: boolean;
+        insertSpaceAfterFunctionKeywordForAnonymousFunctions?: boolean;
+        insertSpaceAfterOpeningAndBeforeClosingNonemptyParenthesis?: boolean;
+        insertSpaceAfterOpeningAndBeforeClosingNonemptyBrackets?: boolean;
+        insertSpaceAfterOpeningAndBeforeClosingNonemptyBraces?: boolean;
+        insertSpaceAfterOpeningAndBeforeClosingTemplateStringBraces?: boolean;
+        insertSpaceAfterOpeningAndBeforeClosingJsxExpressionBraces?: boolean;
+        insertSpaceAfterTypeAssertion?: boolean;
+        insertSpaceBeforeFunctionParenthesis?: boolean;
+        placeOpenBraceOnNewLineForFunctions?: boolean;
+        placeOpenBraceOnNewLineForControlBlocks?: boolean;
+        insertSpaceBeforeTypeAnnotation?: boolean;
+    }
+    interface UserPreferences {
+        readonly disableSuggestions?: boolean;
+        readonly quotePreference?: "double" | "single";
+        readonly includeCompletionsForModuleExports?: boolean;
+        readonly includeCompletionsWithInsertText?: boolean;
+        readonly importModuleSpecifierPreference?: "relative" | "non-relative";
+        readonly allowTextChangesInNewFiles?: boolean;
+    }
+    interface CompilerOptions {
+        allowJs?: boolean;
+        allowSyntheticDefaultImports?: boolean;
+        allowUnreachableCode?: boolean;
+        allowUnusedLabels?: boolean;
+        alwaysStrict?: boolean;
+        baseUrl?: string;
+        charset?: string;
+        checkJs?: boolean;
+        declaration?: boolean;
+        declarationDir?: string;
+        disableSizeLimit?: boolean;
+        downlevelIteration?: boolean;
+        emitBOM?: boolean;
+        emitDecoratorMetadata?: boolean;
+        experimentalDecorators?: boolean;
+        forceConsistentCasingInFileNames?: boolean;
+        importHelpers?: boolean;
+        inlineSourceMap?: boolean;
+        inlineSources?: boolean;
+        isolatedModules?: boolean;
+        jsx?: JsxEmit | ts.JsxEmit;
+        lib?: string[];
+        locale?: string;
+        mapRoot?: string;
+        maxNodeModuleJsDepth?: number;
+        module?: ModuleKind | ts.ModuleKind;
+        moduleResolution?: ModuleResolutionKind | ts.ModuleResolutionKind;
+        newLine?: NewLineKind | ts.NewLineKind;
+        noEmit?: boolean;
+        noEmitHelpers?: boolean;
+        noEmitOnError?: boolean;
+        noErrorTruncation?: boolean;
+        noFallthroughCasesInSwitch?: boolean;
+        noImplicitAny?: boolean;
+        noImplicitReturns?: boolean;
+        noImplicitThis?: boolean;
+        noUnusedLocals?: boolean;
+        noUnusedParameters?: boolean;
+        noImplicitUseStrict?: boolean;
+        noLib?: boolean;
+        noResolve?: boolean;
+        out?: string;
+        outDir?: string;
+        outFile?: string;
+        paths?: MapLike<string[]>;
+        plugins?: PluginImport[];
+        preserveConstEnums?: boolean;
+        preserveSymlinks?: boolean;
+        project?: string;
+        reactNamespace?: string;
+        removeComments?: boolean;
+        references?: ProjectReference[];
+        rootDir?: string;
+        rootDirs?: string[];
+        skipLibCheck?: boolean;
+        skipDefaultLibCheck?: boolean;
+        sourceMap?: boolean;
+        sourceRoot?: string;
+        strict?: boolean;
+        strictNullChecks?: boolean;
+        suppressExcessPropertyErrors?: boolean;
+        suppressImplicitAnyIndexErrors?: boolean;
+        target?: ScriptTarget | ts.ScriptTarget;
+        traceResolution?: boolean;
+        resolveJsonModule?: boolean;
+        types?: string[];
+        typeRoots?: string[];
+        [option: string]: CompilerOptionsValue | undefined;
+    }
+    enum JsxEmit {
+        None = "None",
+        Preserve = "Preserve",
+        ReactNative = "ReactNative",
+        React = "React"
+    }
+    enum ModuleKind {
+        None = "None",
+        CommonJS = "CommonJS",
+        AMD = "AMD",
+        UMD = "UMD",
+        System = "System",
+        ES6 = "ES6",
+        ES2015 = "ES2015",
+        ESNext = "ESNext"
+    }
+    enum ModuleResolutionKind {
+        Classic = "Classic",
+        Node = "Node"
+    }
+    enum NewLineKind {
+        Crlf = "Crlf",
+        Lf = "Lf"
+    }
+    enum ScriptTarget {
+        ES3 = "ES3",
+        ES5 = "ES5",
+        ES6 = "ES6",
+        ES2015 = "ES2015",
+        ES2016 = "ES2016",
+        ES2017 = "ES2017",
+        ESNext = "ESNext"
+    }
+}
+declare namespace ts.server {
+    class TextStorage {
+        private readonly host;
+        private readonly fileName;
+        private svc;
+        private svcVersion;
+        private text;
+        private lineMap;
+        private textVersion;
+        isOpen: boolean;
+        private ownFileText;
+        private pendingReloadFromDisk;
+        constructor(host: ServerHost, fileName: NormalizedPath);
+        getVersion(): string;
+        hasScriptVersionCache_TestOnly(): boolean;
+        useScriptVersionCache_TestOnly(): void;
+        useText(newText?: string): void;
+        edit(start: number, end: number, newText: string): void;
+        reload(newText: string): true | undefined;
+        reloadWithFileText(tempFileName?: string): true | undefined;
+        reloadFromDisk(): boolean | undefined;
+        delayReloadFromFileIntoText(): void;
+        getSnapshot(): IScriptSnapshot;
+        getLineInfo(line: number): AbsolutePositionAndLineText;
+        lineToTextSpan(line: number): TextSpan;
+        lineOffsetToPosition(line: number, offset: number): number;
+        positionToLineOffset(position: number): protocol.Location;
+        private getFileText;
+        private switchToScriptVersionCache;
+        private useScriptVersionCacheIfValidOrOpen;
+        private getOrLoadText;
+        private getLineMap;
+    }
+    function isDynamicFileName(fileName: NormalizedPath): boolean;
+    interface DocumentRegistrySourceFileCache {
+        key: DocumentRegistryBucketKey;
+        sourceFile: SourceFile;
+    }
+    class ScriptInfo {
+        private readonly host;
+        readonly fileName: NormalizedPath;
+        readonly scriptKind: ScriptKind;
+        readonly hasMixedContent: boolean;
+        readonly path: Path;
+        readonly containingProjects: Project[];
+        private formatSettings;
+        private preferences;
+        fileWatcher: FileWatcher | undefined;
+        private textStorage;
+        readonly isDynamic: boolean;
+        private realpath;
+        cacheSourceFile: DocumentRegistrySourceFileCache;
+        constructor(host: ServerHost, fileName: NormalizedPath, scriptKind: ScriptKind, hasMixedContent: boolean, path: Path);
+        isDynamicOrHasMixedContent(): boolean;
+        isScriptOpen(): boolean;
+        open(newText: string): void;
+        close(fileExists?: boolean): void;
+        getSnapshot(): IScriptSnapshot;
+        private ensureRealPath;
+        getRealpathIfDifferent(): Path | undefined;
+        getFormatCodeSettings(): FormatCodeSettings | undefined;
+        getPreferences(): UserPreferences | undefined;
+        attachToProject(project: Project): boolean;
+        isAttached(project: Project): boolean;
+        detachFromProject(project: Project): void;
+        detachAllProjects(): void;
+        getDefaultProject(): Project;
+        registerFileUpdate(): void;
+        setOptions(formatSettings: FormatCodeSettings, preferences: UserPreferences | undefined): void;
+        getLatestVersion(): string;
+        saveTo(fileName: string): void;
+        delayReloadNonMixedContentFile(): void;
+        reloadFromFile(tempFileName?: NormalizedPath): void;
+        getLineInfo(line: number): AbsolutePositionAndLineText;
+        editContent(start: number, end: number, newText: string): void;
+        markContainingProjectsAsDirty(): void;
+        isOrphan(): boolean;
+        lineToTextSpan(line: number): TextSpan;
+        lineOffsetToPosition(line: number, offset: number): number;
+        positionToLineOffset(position: number): protocol.Location;
+        isJavaScript(): boolean;
+    }
+}
+declare namespace ts.server {
+    interface InstallPackageOptionsWithProject extends InstallPackageOptions {
+        projectName: string;
+        projectRootPath: Path;
+    }
+    interface ITypingsInstaller {
+        isKnownTypesPackageName(name: string): boolean;
+        installPackage(options: InstallPackageOptionsWithProject): Promise<ApplyCodeActionCommandResult>;
+        enqueueInstallTypingsRequest(p: Project, typeAcquisition: TypeAcquisition, unresolvedImports: SortedReadonlyArray<string> | undefined): void;
+        attach(projectService: ProjectService): void;
+        onProjectClosed(p: Project): void;
+        readonly globalTypingsCacheLocation: string | undefined;
+    }
+    const nullTypingsInstaller: ITypingsInstaller;
+    class TypingsCache {
+        private readonly installer;
+        private readonly perProjectCache;
+        constructor(installer: ITypingsInstaller);
+        isKnownTypesPackageName(name: string): boolean;
+        installPackage(options: InstallPackageOptionsWithProject): Promise<ApplyCodeActionCommandResult>;
+        enqueueInstallTypingsForProject(project: Project, unresolvedImports: SortedReadonlyArray<string> | undefined, forceRefresh: boolean): void;
+        updateTypingsForProject(projectName: string, compilerOptions: CompilerOptions, typeAcquisition: TypeAcquisition, unresolvedImports: SortedReadonlyArray<string>, newTypings: string[]): SortedReadonlyArray<never> | SortedArray<string>;
+        onProjectClosed(project: Project): void;
+    }
+}
+declare namespace ts.server {
+    enum ProjectKind {
+        Inferred = 0,
+        Configured = 1,
+        External = 2
+    }
+    type Mutable<T> = {
+        -readonly [K in keyof T]: T[K];
+    };
+    function countEachFileTypes(infos: ScriptInfo[]): FileStats;
+    function allRootFilesAreJsOrDts(project: Project): boolean;
+    function allFilesAreJsOrDts(project: Project): boolean;
+    function hasNoTypeScriptSource(fileNames: string[]): boolean;
+    interface ProjectFilesWithTSDiagnostics extends protocol.ProjectFiles {
+        projectErrors: ReadonlyArray<Diagnostic>;
+    }
+    interface PluginCreateInfo {
+        project: Project;
+        languageService: LanguageService;
+        languageServiceHost: LanguageServiceHost;
+        serverHost: ServerHost;
+        config: any;
+    }
+    interface PluginModule {
+        create(createInfo: PluginCreateInfo): LanguageService;
+        getExternalFiles?(proj: Project): string[];
+    }
+    type PluginModuleFactory = (mod: {
+        typescript: typeof ts;
+    }) => PluginModule;
+    type ProjectRoot = ScriptInfo | NormalizedPath;
+    function isScriptInfo(value: ProjectRoot): value is ScriptInfo;
+    abstract class Project implements LanguageServiceHost, ModuleResolutionHost {
+        readonly projectName: string;
+        readonly projectKind: ProjectKind;
+        readonly projectService: ProjectService;
+        private documentRegistry;
+        private compilerOptions;
+        compileOnSaveEnabled: boolean;
+        private rootFiles;
+        private rootFilesMap;
+        private program;
+        private externalFiles;
+        private missingFilesMap;
+        private plugins;
+        cachedUnresolvedImportsPerFile: Map<ReadonlyArray<string>>;
+        lastCachedUnresolvedImportsList: SortedReadonlyArray<string> | undefined;
+        private hasAddedorRemovedFiles;
+        private lastFileExceededProgramSize;
+        protected languageService: LanguageService;
+        languageServiceEnabled: boolean;
+        readonly trace?: (s: string) => void;
+        readonly realpath?: (path: string) => string;
+        hasInvalidatedResolution: HasInvalidatedResolution;
+        resolutionCache: ResolutionCache;
+        private builderState;
+        private updatedFileNames;
+        private lastReportedFileNames;
+        private lastReportedVersion;
+        private projectProgramVersion;
+        private projectStateVersion;
+        dirty: boolean;
+        hasChangedAutomaticTypeDirectiveNames: boolean;
+        typingFiles: SortedReadonlyArray<string>;
+        private readonly cancellationToken;
+        isNonTsProject(): boolean;
+        isJsOnlyProject(): boolean;
+        static resolveModule(moduleName: string, initialDir: string, host: ServerHost, log: (message: string) => void): {} | undefined;
+        readonly currentDirectory: string;
+        directoryStructureHost: DirectoryStructureHost;
+        readonly getCanonicalFileName: GetCanonicalFileName;
+        constructor(projectName: string, projectKind: ProjectKind, projectService: ProjectService, documentRegistry: DocumentRegistry, hasExplicitListOfFiles: boolean, lastFileExceededProgramSize: string | undefined, compilerOptions: CompilerOptions, compileOnSaveEnabled: boolean, directoryStructureHost: DirectoryStructureHost, currentDirectory: string | undefined);
+        isKnownTypesPackageName(name: string): boolean;
+        installPackage(options: InstallPackageOptions): Promise<ApplyCodeActionCommandResult>;
+        private readonly typingsCache;
+        getCompilationSettings(): CompilerOptions;
+        getCompilerOptions(): CompilerOptions;
+        getNewLine(): string;
+        getProjectVersion(): string;
+        getProjectReferences(): ReadonlyArray<ProjectReference> | undefined;
+        getScriptFileNames(): string[];
+        private getOrCreateScriptInfoAndAttachToProject;
+        getScriptKind(fileName: string): ScriptKind;
+        getScriptVersion(filename: string): string;
+        getScriptSnapshot(filename: string): IScriptSnapshot | undefined;
+        getCancellationToken(): HostCancellationToken;
+        getCurrentDirectory(): string;
+        getDefaultLibFileName(): string;
+        useCaseSensitiveFileNames(): boolean;
+        readDirectory(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
+        readFile(fileName: string): string | undefined;
+        fileExists(file: string): boolean;
+        resolveModuleNames(moduleNames: string[], containingFile: string, reusedNames?: string[]): ResolvedModuleFull[];
+        getResolvedModuleWithFailedLookupLocationsFromCache(moduleName: string, containingFile: string): ResolvedModuleWithFailedLookupLocations | undefined;
+        resolveTypeReferenceDirectives(typeDirectiveNames: string[], containingFile: string): ResolvedTypeReferenceDirective[];
+        directoryExists(path: string): boolean;
+        getDirectories(path: string): string[];
+        getCachedDirectoryStructureHost(): CachedDirectoryStructureHost;
+        toPath(fileName: string): Path;
+        watchDirectoryOfFailedLookupLocation(directory: string, cb: DirectoryWatcherCallback, flags: WatchDirectoryFlags): FileWatcher;
+        onInvalidatedResolution(): void;
+        watchTypeRootsDirectory(directory: string, cb: DirectoryWatcherCallback, flags: WatchDirectoryFlags): FileWatcher;
+        onChangedAutomaticTypeDirectiveNames(): void;
+        getGlobalCache(): string | undefined;
+        writeLog(s: string): void;
+        log(s: string): void;
+        error(s: string): void;
+        private setInternalCompilerOptionsForEmittingJsFiles;
+        getGlobalProjectErrors(): ReadonlyArray<Diagnostic>;
+        getAllProjectErrors(): ReadonlyArray<Diagnostic>;
+        getLanguageService(ensureSynchronized?: boolean): LanguageService;
+        private shouldEmitFile;
+        getCompileOnSaveAffectedFileList(scriptInfo: ScriptInfo): string[];
+        emitFile(scriptInfo: ScriptInfo, writeFile: (path: string, data: string, writeByteOrderMark?: boolean) => void): boolean;
+        enableLanguageService(): void;
+        disableLanguageService(lastFileExceededProgramSize?: string): void;
+        getProjectName(): string;
+        abstract getTypeAcquisition(): TypeAcquisition;
+        protected removeLocalTypingsFromTypeAcquisition(newTypeAcquisition: TypeAcquisition): TypeAcquisition;
+        getExternalFiles(): SortedReadonlyArray<string>;
+        getSourceFile(path: Path): SourceFile | undefined;
+        getSourceFileOrConfigFile(path: Path): SourceFile | undefined;
+        close(): void;
+        private detachScriptInfoIfNotRoot;
+        isClosed(): boolean;
+        hasRoots(): boolean;
+        isOrphan(): boolean;
+        getRootFiles(): NormalizedPath[];
+        getRootFilesMap(): Map<ProjectRoot>;
+        getRootScriptInfos(): ScriptInfo[];
+        getScriptInfos(): ScriptInfo[];
+        getExcludedFiles(): ReadonlyArray<NormalizedPath>;
+        getFileNames(excludeFilesFromExternalLibraries?: boolean, excludeConfigFiles?: boolean): NormalizedPath[];
+        hasConfigFile(configFilePath: NormalizedPath): boolean;
+        containsScriptInfo(info: ScriptInfo): boolean;
+        containsFile(filename: NormalizedPath, requireOpen?: boolean): boolean;
+        isRoot(info: ScriptInfo): boolean;
+        addRoot(info: ScriptInfo): void;
+        addMissingFileRoot(fileName: NormalizedPath): void;
+        removeFile(info: ScriptInfo, fileExists: boolean, detachFromProject: boolean): void;
+        registerFileUpdate(fileName: string): void;
+        markAsDirty(): void;
+        private extractUnresolvedImportsFromSourceFile;
+        onFileAddedOrRemoved(): void;
+        updateGraph(): boolean;
+        updateTypingFiles(typingFiles: SortedReadonlyArray<string>): void;
+        getCurrentProgram(): Program;
+        protected removeExistingTypings(include: string[]): string[];
+        private updateGraphWorker;
+        private detachScriptInfoFromProject;
+        private addMissingFileWatcher;
+        private isWatchedMissingFile;
+        getScriptInfoForNormalizedPath(fileName: NormalizedPath): ScriptInfo | undefined;
+        getScriptInfo(uncheckedFileName: string): ScriptInfo | undefined;
+        filesToString(writeProjectFileNames: boolean): string;
+        setCompilerOptions(compilerOptions: CompilerOptions): void;
+        getChangesSinceVersion(lastKnownVersion?: number): ProjectFilesWithTSDiagnostics;
+        protected removeRoot(info: ScriptInfo): void;
+        protected enableGlobalPlugins(): void;
+        protected enablePlugin(pluginConfigEntry: PluginImport, searchPaths: string[]): void;
+        refreshDiagnostics(): void;
+        private enableProxy;
+    }
+    class InferredProject extends Project {
+        private static readonly newName;
+        private _isJsInferredProject;
+        toggleJsInferredProject(isJsInferredProject: boolean): void;
+        setCompilerOptions(options?: CompilerOptions): void;
+        readonly projectRootPath: string | undefined;
+        readonly canonicalCurrentDirectory: string | undefined;
+        constructor(projectService: ProjectService, documentRegistry: DocumentRegistry, compilerOptions: CompilerOptions, projectRootPath: NormalizedPath | undefined, currentDirectory: string | undefined);
+        addRoot(info: ScriptInfo): void;
+        removeRoot(info: ScriptInfo): void;
+        isOrphan(): boolean;
+        isProjectWithSingleRoot(): boolean;
+        close(): void;
+        getTypeAcquisition(): TypeAcquisition;
+    }
+    class ConfiguredProject extends Project {
+        compileOnSaveEnabled: boolean;
+        private projectReferences;
+        private typeAcquisition;
+        configFileWatcher: FileWatcher | undefined;
+        private directoriesWatchedForWildcards;
+        readonly canonicalConfigFilePath: NormalizedPath;
+        pendingReload: ConfigFileProgramReloadLevel;
+        configFileSpecs: ConfigFileSpecs | undefined;
+        private externalProjectRefCount;
+        private projectErrors;
+        constructor(configFileName: NormalizedPath, projectService: ProjectService, documentRegistry: DocumentRegistry, hasExplicitListOfFiles: boolean, compilerOptions: CompilerOptions, lastFileExceededProgramSize: string | undefined, compileOnSaveEnabled: boolean, cachedDirectoryStructureHost: CachedDirectoryStructureHost, projectReferences: ReadonlyArray<ProjectReference> | undefined);
+        updateGraph(): boolean;
+        getCachedDirectoryStructureHost(): CachedDirectoryStructureHost;
+        getConfigFilePath(): NormalizedPath;
+        getProjectReferences(): ReadonlyArray<ProjectReference> | undefined;
+        updateReferences(refs: ReadonlyArray<ProjectReference> | undefined): void;
+        enablePlugins(): void;
+        getGlobalProjectErrors(): ReadonlyArray<Diagnostic>;
+        getAllProjectErrors(): ReadonlyArray<Diagnostic>;
+        setProjectErrors(projectErrors: Diagnostic[]): void;
+        setTypeAcquisition(newTypeAcquisition: TypeAcquisition): void;
+        getTypeAcquisition(): TypeAcquisition;
+        watchWildcards(wildcardDirectories: Map<WatchDirectoryFlags>): void;
+        stopWatchingWildCards(): void;
+        close(): void;
+        addExternalProjectReference(): void;
+        deleteExternalProjectReference(): void;
+        hasOpenRef(): boolean;
+        getEffectiveTypeRoots(): string[];
+        updateErrorOnNoInputFiles(hasFileNames: boolean): void;
+    }
+    class ExternalProject extends Project {
+        externalProjectName: string;
+        compileOnSaveEnabled: boolean;
+        excludedFiles: ReadonlyArray<NormalizedPath>;
+        private typeAcquisition;
+        constructor(externalProjectName: string, projectService: ProjectService, documentRegistry: DocumentRegistry, compilerOptions: CompilerOptions, lastFileExceededProgramSize: string | undefined, compileOnSaveEnabled: boolean, projectFilePath?: string);
+        getExcludedFiles(): ReadonlyArray<NormalizedPath>;
+        getTypeAcquisition(): TypeAcquisition;
+        setTypeAcquisition(newTypeAcquisition: TypeAcquisition): void;
+    }
+}
+declare namespace ts.server {
+    const maxProgramSizeForNonTsFiles: number;
+    const ProjectsUpdatedInBackgroundEvent = "projectsUpdatedInBackground";
+    const ConfigFileDiagEvent = "configFileDiag";
+    const ProjectLanguageServiceStateEvent = "projectLanguageServiceState";
+    const ProjectInfoTelemetryEvent = "projectInfo";
+    const OpenFileInfoTelemetryEvent = "openFileInfo";
+    interface ProjectsUpdatedInBackgroundEvent {
+        eventName: typeof ProjectsUpdatedInBackgroundEvent;
+        data: {
+            openFiles: string[];
+        };
+    }
+    interface ConfigFileDiagEvent {
+        eventName: typeof ConfigFileDiagEvent;
+        data: {
+            triggerFile: string;
+            configFileName: string;
+            diagnostics: ReadonlyArray<Diagnostic>;
+        };
+    }
+    interface ProjectLanguageServiceStateEvent {
+        eventName: typeof ProjectLanguageServiceStateEvent;
+        data: {
+            project: Project;
+            languageServiceEnabled: boolean;
+        };
+    }
+    interface ProjectInfoTelemetryEvent {
+        readonly eventName: typeof ProjectInfoTelemetryEvent;
+        readonly data: ProjectInfoTelemetryEventData;
+    }
+    interface ProjectInfoTelemetryEventData {
+        readonly projectId: string;
+        readonly fileStats: FileStats;
+        readonly compilerOptions: CompilerOptions;
+        readonly extends: boolean | undefined;
+        readonly files: boolean | undefined;
+        readonly include: boolean | undefined;
+        readonly exclude: boolean | undefined;
+        readonly compileOnSave: boolean;
+        readonly typeAcquisition: ProjectInfoTypeAcquisitionData;
+        readonly configFileName: "tsconfig.json" | "jsconfig.json" | "other";
+        readonly projectType: "external" | "configured";
+        readonly languageServiceEnabled: boolean;
+        readonly version: string;
+    }
+    interface OpenFileInfoTelemetryEvent {
+        readonly eventName: typeof OpenFileInfoTelemetryEvent;
+        readonly data: OpenFileInfoTelemetryEventData;
+    }
+    interface OpenFileInfoTelemetryEventData {
+        readonly info: OpenFileInfo;
+    }
+    interface ProjectInfoTypeAcquisitionData {
+        readonly enable: boolean | undefined;
+        readonly include: boolean;
+        readonly exclude: boolean;
+    }
+    interface FileStats {
+        readonly js: number;
+        readonly jsx: number;
+        readonly ts: number;
+        readonly tsx: number;
+        readonly dts: number;
+        readonly deferred: number;
+    }
+    interface OpenFileInfo {
+        readonly checkJs: boolean;
+    }
+    type ProjectServiceEvent = ProjectsUpdatedInBackgroundEvent | ConfigFileDiagEvent | ProjectLanguageServiceStateEvent | ProjectInfoTelemetryEvent | OpenFileInfoTelemetryEvent;
+    type ProjectServiceEventHandler = (event: ProjectServiceEvent) => void;
+    interface SafeList {
+        [name: string]: {
+            match: RegExp;
+            exclude?: (string | number)[][];
+            types?: string[];
+        };
+    }
+    interface TypesMapFile {
+        typesMap: SafeList;
+        simpleMap: {
+            [libName: string]: string;
+        };
+    }
+    function convertFormatOptions(protocolOptions: protocol.FormatCodeSettings): FormatCodeSettings;
+    function convertCompilerOptions(protocolOptions: protocol.ExternalProjectCompilerOptions): CompilerOptions & protocol.CompileOnSaveMixin;
+    function tryConvertScriptKindName(scriptKindName: protocol.ScriptKindName | ScriptKind): ScriptKind;
+    function convertScriptKindName(scriptKindName: protocol.ScriptKindName): ScriptKind.Unknown | ScriptKind.JS | ScriptKind.JSX | ScriptKind.TS | ScriptKind.TSX;
+    interface HostConfiguration {
+        formatCodeOptions: FormatCodeSettings;
+        preferences: UserPreferences;
+        hostInfo: string;
+        extraFileExtensions?: FileExtensionInfo[];
+    }
+    interface OpenConfiguredProjectResult {
+        configFileName?: NormalizedPath;
+        configFileErrors?: ReadonlyArray<Diagnostic>;
+    }
+    enum WatchType {
+        ConfigFilePath = "Config file for the program",
+        MissingFilePath = "Missing file from program",
+        WildcardDirectories = "Wild card directory",
+        ClosedScriptInfo = "Closed Script info",
+        ConfigFileForInferredRoot = "Config file for the inferred project root",
+        FailedLookupLocation = "Directory of Failed lookup locations in module resolution",
+        TypeRoots = "Type root directory"
+    }
+    interface ConfigFileExistenceInfo {
+        exists: boolean;
+        openFilesImpactedByConfigFile: Map<boolean>;
+        configFileWatcherForRootOfInferredProject?: FileWatcher;
+    }
+    interface ProjectServiceOptions {
+        host: ServerHost;
+        logger: Logger;
+        cancellationToken: HostCancellationToken;
+        useSingleInferredProject: boolean;
+        useInferredProjectPerProjectRoot: boolean;
+        typingsInstaller: ITypingsInstaller;
+        eventHandler?: ProjectServiceEventHandler;
+        suppressDiagnosticEvents?: boolean;
+        throttleWaitMilliseconds?: number;
+        globalPlugins?: ReadonlyArray<string>;
+        pluginProbeLocations?: ReadonlyArray<string>;
+        allowLocalPluginLoads?: boolean;
+        typesMapLocation?: string;
+        syntaxOnly?: boolean;
+    }
+    class ProjectService {
+        readonly typingsCache: TypingsCache;
+        readonly documentRegistry: DocumentRegistry;
+        private readonly filenameToScriptInfo;
+        private readonly allJsFilesForOpenFileTelemetry;
+        readonly realpathToScriptInfos: MultiMap<ScriptInfo> | undefined;
+        private readonly externalProjectToConfiguredProjectMap;
+        readonly externalProjects: ExternalProject[];
+        readonly inferredProjects: InferredProject[];
+        readonly configuredProjects: Map<ConfiguredProject>;
+        readonly openFiles: Map<NormalizedPath | undefined>;
+        private readonly openFilesWithNonRootedDiskPath;
+        private compilerOptionsForInferredProjects;
+        private compilerOptionsForInferredProjectsPerProjectRoot;
+        private readonly projectToSizeMap;
+        private readonly configFileExistenceInfoCache;
+        private readonly throttledOperations;
+        private readonly hostConfiguration;
+        private safelist;
+        private legacySafelist;
+        private pendingProjectUpdates;
+        pendingEnsureProjectForOpenFiles: boolean;
+        readonly currentDirectory: NormalizedPath;
+        readonly toCanonicalFileName: (f: string) => string;
+        readonly host: ServerHost;
+        readonly logger: Logger;
+        readonly cancellationToken: HostCancellationToken;
+        readonly useSingleInferredProject: boolean;
+        readonly useInferredProjectPerProjectRoot: boolean;
+        readonly typingsInstaller: ITypingsInstaller;
+        private readonly globalCacheLocationDirectoryPath;
+        readonly throttleWaitMilliseconds?: number;
+        private readonly eventHandler?;
+        private readonly suppressDiagnosticEvents?;
+        readonly globalPlugins: ReadonlyArray<string>;
+        readonly pluginProbeLocations: ReadonlyArray<string>;
+        readonly allowLocalPluginLoads: boolean;
+        readonly typesMapLocation: string | undefined;
+        readonly syntaxOnly?: boolean;
+        private readonly seenProjects;
+        readonly watchFactory: WatchFactory<WatchType, Project>;
+        constructor(opts: ProjectServiceOptions);
+        toPath(fileName: string): Path;
+        getExecutingFilePath(): string;
+        getNormalizedAbsolutePath(fileName: string): string;
+        setDocument(key: DocumentRegistryBucketKey, path: Path, sourceFile: SourceFile): void;
+        getDocument(key: DocumentRegistryBucketKey, path: Path): SourceFile | undefined;
+        ensureInferredProjectsUpToDate_TestOnly(): void;
+        getCompilerOptionsForInferredProjects(): CompilerOptions;
+        onUpdateLanguageServiceStateForProject(project: Project, languageServiceEnabled: boolean): void;
+        private loadTypesMap;
+        updateTypingsForProject(response: SetTypings | InvalidateCachedTypings | PackageInstalledResponse): void;
+        updateTypingsForProject(response: SetTypings | InvalidateCachedTypings | PackageInstalledResponse | BeginInstallTypes | EndInstallTypes): void;
+        private delayEnsureProjectForOpenFiles;
+        private delayUpdateProjectGraph;
+        hasPendingProjectUpdate(project: Project): boolean;
+        sendProjectsUpdatedInBackgroundEvent(): void;
+        delayUpdateProjectGraphAndEnsureProjectStructureForOpenFiles(project: Project): void;
+        private delayUpdateProjectGraphs;
+        setCompilerOptionsForInferredProjects(projectCompilerOptions: protocol.ExternalProjectCompilerOptions, projectRootPath?: string): void;
+        findProject(projectName: string): Project | undefined;
+        getDefaultProjectForFile(fileName: NormalizedPath, ensureProject: boolean): Project | undefined;
+        getScriptInfoEnsuringProjectsUptoDate(uncheckedFileName: string): ScriptInfo | undefined;
+        private ensureProjectStructuresUptoDate;
+        getFormatCodeOptions(file: NormalizedPath): FormatCodeSettings;
+        getPreferences(file: NormalizedPath): UserPreferences;
+        private onSourceFileChanged;
+        private handleDeletedFile;
+        watchWildcardDirectory(directory: Path, flags: WatchDirectoryFlags, project: ConfiguredProject): FileWatcher;
+        getConfigFileExistenceInfo(project: ConfiguredProject): ConfigFileExistenceInfo;
+        private onConfigChangedForConfiguredProject;
+        private onConfigFileChangeForOpenScriptInfo;
+        private removeProject;
+        assignOrphanScriptInfoToInferredProject(info: ScriptInfo, projectRootPath: NormalizedPath | undefined): InferredProject;
+        private closeOpenFile;
+        private deleteScriptInfo;
+        private configFileExists;
+        private setConfigFileExistenceByNewConfiguredProject;
+        private configFileExistenceImpactsRootOfInferredProject;
+        private setConfigFileExistenceInfoByClosedConfiguredProject;
+        private logConfigFileWatchUpdate;
+        private createConfigFileWatcherOfConfigFileExistence;
+        private closeConfigFileWatcherOfConfigFileExistenceInfo;
+        private stopWatchingConfigFilesForClosedScriptInfo;
+        startWatchingConfigFilesForInferredProjectRoot(info: ScriptInfo): void;
+        stopWatchingConfigFilesForInferredProjectRoot(info: ScriptInfo): void;
+        private forEachConfigFileLocation;
+        private getConfigFileNameForFile;
+        private printProjects;
+        private findConfiguredProjectByProjectName;
+        private getConfiguredProjectByCanonicalConfigFilePath;
+        private findExternalProjectByProjectName;
+        private convertConfigFileContentToProjectOptions;
+        private getFilenameForExceededTotalSizeLimitForNonTsFiles;
+        private createExternalProject;
+        private sendProjectTelemetry;
+        private addFilesToNonInferredProjectAndUpdateGraph;
+        private createConfiguredProject;
+        private updateNonInferredProjectFiles;
+        private updateNonInferredProject;
+        reloadFileNamesOfConfiguredProject(project: ConfiguredProject): boolean;
+        reloadConfiguredProject(project: ConfiguredProject): void;
+        private sendConfigFileDiagEvent;
+        private getOrCreateInferredProjectForProjectRootPathIfEnabled;
+        private getOrCreateSingleInferredProjectIfEnabled;
+        private getOrCreateSingleInferredWithoutProjectRoot;
+        private createInferredProject;
+        getOrCreateScriptInfoNotOpenedByClient(uncheckedFileName: string, currentDirectory: string, hostToQueryFileExistsOn: DirectoryStructureHost): ScriptInfo | undefined;
+        getScriptInfo(uncheckedFileName: string): ScriptInfo | undefined;
+        getSymlinkedProjects(info: ScriptInfo): MultiMap<Project> | undefined;
+        private watchClosedScriptInfo;
+        private stopWatchingScriptInfo;
+        getOrCreateScriptInfoNotOpenedByClientForNormalizedPath(fileName: NormalizedPath, currentDirectory: string, scriptKind: ScriptKind | undefined, hasMixedContent: boolean | undefined, hostToQueryFileExistsOn: DirectoryStructureHost | undefined): ScriptInfo | undefined;
+        getOrCreateScriptInfoOpenedByClientForNormalizedPath(fileName: NormalizedPath, currentDirectory: string, fileContent: string | undefined, scriptKind: ScriptKind | undefined, hasMixedContent: boolean | undefined): ScriptInfo | undefined;
+        getOrCreateScriptInfoForNormalizedPath(fileName: NormalizedPath, openedByClient: boolean, fileContent?: string, scriptKind?: ScriptKind, hasMixedContent?: boolean, hostToQueryFileExistsOn?: {
+            fileExists(path: string): boolean;
+        }): ScriptInfo | undefined;
+        private getOrCreateScriptInfoWorker;
+        getScriptInfoForNormalizedPath(fileName: NormalizedPath): ScriptInfo | undefined;
+        getScriptInfoForPath(fileName: Path): ScriptInfo | undefined;
+        setHostConfiguration(args: protocol.ConfigureRequestArguments): void;
+        closeLog(): void;
+        reloadProjects(): void;
+        private delayReloadConfiguredProjectForFiles;
+        private reloadConfiguredProjectForFiles;
+        private removeRootOfInferredProjectIfNowPartOfOtherProject;
+        private ensureProjectForOpenFiles;
+        openClientFile(fileName: string, fileContent?: string, scriptKind?: ScriptKind, projectRootPath?: string): OpenConfiguredProjectResult;
+        private findExternalProjectContainingOpenScriptInfo;
+        openClientFileWithNormalizedPath(fileName: NormalizedPath, fileContent?: string, scriptKind?: ScriptKind, hasMixedContent?: boolean, projectRootPath?: NormalizedPath): OpenConfiguredProjectResult;
+        private telemetryOnOpenFile;
+        closeClientFile(uncheckedFileName: string): void;
+        private collectChanges;
+        synchronizeProjectList(knownProjects: protocol.ProjectVersionInfo[]): ProjectFilesWithTSDiagnostics[];
+        applyChangesInOpenFiles(openFiles: protocol.ExternalFile[] | undefined, changedFiles: protocol.ChangedOpenFile[] | undefined, closedFiles: string[] | undefined): void;
+        applyChangesToFile(scriptInfo: ScriptInfo, changes: TextChange[]): void;
+        private closeConfiguredProjectReferencedFromExternalProject;
+        closeExternalProject(uncheckedFileName: string): void;
+        openExternalProjects(projects: protocol.ExternalProject[]): void;
+        private static readonly filenameEscapeRegexp;
+        private static escapeFilenameForRegex;
+        resetSafeList(): void;
+        applySafeList(proj: protocol.ExternalProject): NormalizedPath[];
+        openExternalProject(proj: protocol.ExternalProject): void;
+        hasDeferredExtension(): boolean;
+    }
+}
+declare namespace ts.server {
+    interface ServerCancellationToken extends HostCancellationToken {
+        setRequest(requestId: number): void;
+        resetRequest(requestId: number): void;
+    }
+    const nullCancellationToken: ServerCancellationToken;
+    interface PendingErrorCheck {
+        fileName: NormalizedPath;
+        project: Project;
+    }
+    type CommandNames = protocol.CommandTypes;
+    const CommandNames: any;
+    function formatMessage<T extends protocol.Message>(msg: T, logger: Logger, byteLength: (s: string, encoding: string) => number, newLine: string): string;
+    type Event = <T extends object>(body: T, eventName: string) => void;
+    interface EventSender {
+        event: Event;
+    }
+    function toEvent(eventName: string, body: object): protocol.Event;
+    interface SessionOptions {
+        host: ServerHost;
+        cancellationToken: ServerCancellationToken;
+        useSingleInferredProject: boolean;
+        useInferredProjectPerProjectRoot: boolean;
+        typingsInstaller: ITypingsInstaller;
+        byteLength: (buf: string, encoding?: string) => number;
+        hrtime: (start?: number[]) => number[];
+        logger: Logger;
+        canUseEvents: boolean;
+        eventHandler?: ProjectServiceEventHandler;
+        suppressDiagnosticEvents?: boolean;
+        syntaxOnly?: boolean;
+        throttleWaitMilliseconds?: number;
+        noGetErrOnBackgroundUpdate?: boolean;
+        globalPlugins?: ReadonlyArray<string>;
+        pluginProbeLocations?: ReadonlyArray<string>;
+        allowLocalPluginLoads?: boolean;
+    }
+    class Session implements EventSender {
+        private readonly gcTimer;
+        protected projectService: ProjectService;
+        private changeSeq;
+        private currentRequestId;
+        private errorCheck;
+        protected host: ServerHost;
+        private readonly cancellationToken;
+        protected readonly typingsInstaller: ITypingsInstaller;
+        protected byteLength: (buf: string, encoding?: string) => number;
+        private hrtime;
+        protected logger: Logger;
+        protected canUseEvents: boolean;
+        private suppressDiagnosticEvents?;
+        private eventHandler;
+        private readonly noGetErrOnBackgroundUpdate?;
+        constructor(opts: SessionOptions);
+        private sendRequestCompletedEvent;
+        private defaultEventHandler;
+        private projectsUpdatedInBackgroundEvent;
+        logError(err: Error, cmd: string): void;
+        send(msg: protocol.Message): void;
+        event<T extends object>(body: T, eventName: string): void;
+        output(info: any, cmdName: string, reqSeq?: number, errorMsg?: string): void;
+        private doOutput;
+        private semanticCheck;
+        private syntacticCheck;
+        private suggestionCheck;
+        private sendDiagnosticsEvent;
+        private updateErrorCheck;
+        private cleanProjects;
+        private cleanup;
+        private getEncodedSemanticClassifications;
+        private getProject;
+        private getConfigFileAndProject;
+        private getConfigFileDiagnostics;
+        private convertToDiagnosticsWithLinePositionFromDiagnosticFile;
+        private getCompilerOptionsDiagnostics;
+        private convertToDiagnosticsWithLinePosition;
+        private getDiagnosticsWorker;
+        private getDefinition;
+        private getDefinitionAndBoundSpan;
+        private mapDefinitionInfo;
+        private static mapToOriginalLocation;
+        private toFileSpan;
+        private getTypeDefinition;
+        private getImplementation;
+        private getOccurrences;
+        private getSyntacticDiagnosticsSync;
+        private getSemanticDiagnosticsSync;
+        private getSuggestionDiagnosticsSync;
+        private getJsxClosingTag;
+        private getDocumentHighlights;
+        private setCompilerOptionsForInferredProjects;
+        private getProjectInfo;
+        private getProjectInfoWorker;
+        private getRenameInfo;
+        private getProjects;
+        private getDefaultProject;
+        private getRenameLocations;
+        private getReferences;
+        private openClientFile;
+        private getPosition;
+        private getPositionInFile;
+        private getFileAndProject;
+        private getFileAndLanguageServiceForSyntacticOperation;
+        private getFileAndProjectWorker;
+        private getOutliningSpans;
+        private getTodoComments;
+        private getDocCommentTemplate;
+        private getSpanOfEnclosingComment;
+        private getIndentation;
+        private getBreakpointStatement;
+        private getNameOrDottedNameSpan;
+        private isValidBraceCompletion;
+        private getQuickInfoWorker;
+        private getFormattingEditsForRange;
+        private getFormattingEditsForRangeFull;
+        private getFormattingEditsForDocumentFull;
+        private getFormattingEditsAfterKeystrokeFull;
+        private getFormattingEditsAfterKeystroke;
+        private getCompletions;
+        private getCompletionEntryDetails;
+        private getCompileOnSaveAffectedFileList;
+        private emitFile;
+        private getSignatureHelpItems;
+        private createCheckList;
+        private getDiagnostics;
+        private change;
+        private reload;
+        private saveToTmp;
+        private closeClientFile;
+        private mapLocationNavigationBarItems;
+        private getNavigationBarItems;
+        private toLocationNavigationTree;
+        private toLocationTextSpan;
+        private getNavigationTree;
+        private getNavigateToItems;
+        private getSupportedCodeFixes;
+        private isLocation;
+        private extractPositionAndRange;
+        private getApplicableRefactors;
+        private getEditsForRefactor;
+        private organizeImports;
+        private getEditsForFileRename;
+        private getCodeFixes;
+        private getCombinedCodeFix;
+        private applyCodeActionCommand;
+        private getStartAndEndPosition;
+        private mapCodeAction;
+        private mapCodeFixAction;
+        private mapTextChangesToCodeEdits;
+        private convertTextChangeToCodeEdit;
+        private getBraceMatching;
+        private getDiagnosticsForProject;
+        getCanonicalFileName(fileName: string): string;
+        exit(): void;
+        private notRequired;
+        private requiredResponse;
+        private handlers;
+        addProtocolHandler(command: string, handler: (request: protocol.Request) => HandlerResponse): void;
+        private setCurrentRequest;
+        private resetCurrentRequest;
+        executeWithRequestId<T>(requestId: number, f: () => T): T;
+        executeCommand(request: protocol.Request): HandlerResponse;
+        onMessage(message: string): void;
+        private getFormatOptions;
+        private getPreferences;
+    }
+    interface HandlerResponse {
+        response?: {};
+        responseRequired?: boolean;
+    }
+    function getLocationInNewDocument(oldText: string, renameFilename: string, renameLocation: number, edits: ReadonlyArray<FileTextChanges>): protocol.Location;
+}
+declare namespace ts.server {
+    interface LineCollection {
+        charCount(): number;
+        lineCount(): number;
+        isLeaf(): this is LineLeaf;
+        walk(rangeStart: number, rangeLength: number, walkFns: LineIndexWalker): void;
+    }
+    interface AbsolutePositionAndLineText {
+        absolutePosition: number;
+        lineText: string | undefined;
+    }
+    enum CharRangeSection {
+        PreStart = 0,
+        Start = 1,
+        Entire = 2,
+        Mid = 3,
+        End = 4,
+        PostEnd = 5
+    }
+    interface LineIndexWalker {
+        goSubtree: boolean;
+        done: boolean;
+        leaf(relativeStart: number, relativeLength: number, lineCollection: LineLeaf): void;
+        pre?(relativeStart: number, relativeLength: number, lineCollection: LineCollection, parent: LineNode, nodeType: CharRangeSection): void;
+        post?(relativeStart: number, relativeLength: number, lineCollection: LineCollection, parent: LineNode, nodeType: CharRangeSection): void;
+    }
+    class ScriptVersionCache {
+        private changes;
+        private readonly versions;
+        private minVersion;
+        private currentVersion;
+        private static readonly changeNumberThreshold;
+        private static readonly changeLengthThreshold;
+        private static readonly maxVersions;
+        private versionToIndex;
+        private currentVersionToIndex;
+        edit(pos: number, deleteLen: number, insertedText?: string): void;
+        getSnapshot(): IScriptSnapshot;
+        private _getSnapshot;
+        getSnapshotVersion(): number;
+        getLineInfo(line: number): AbsolutePositionAndLineText;
+        lineOffsetToPosition(line: number, column: number): number;
+        positionToLineOffset(position: number): protocol.Location;
+        lineToTextSpan(line: number): TextSpan;
+        getTextChangesBetweenVersions(oldVersion: number, newVersion: number): TextChangeRange | undefined;
+        static fromString(script: string): ScriptVersionCache;
+    }
+    class LineIndex {
+        root: LineNode;
+        checkEdits: boolean;
+        absolutePositionOfStartOfLine(oneBasedLine: number): number;
+        positionToLineOffset(position: number): protocol.Location;
+        private positionToColumnAndLineText;
+        lineNumberToInfo(oneBasedLine: number): AbsolutePositionAndLineText;
+        load(lines: string[]): void;
+        walk(rangeStart: number, rangeLength: number, walkFns: LineIndexWalker): void;
+        getText(rangeStart: number, rangeLength: number): string;
+        getLength(): number;
+        every(f: (ll: LineLeaf, s: number, len: number) => boolean, rangeStart: number, rangeEnd?: number): boolean;
+        edit(pos: number, deleteLength: number, newText?: string): LineIndex;
+        private static buildTreeFromBottom;
+        static linesFromText(text: string): {
+            lines: string[];
+            lineMap: number[];
+        };
+    }
+    class LineNode implements LineCollection {
+        private readonly children;
+        totalChars: number;
+        totalLines: number;
+        constructor(children?: LineCollection[]);
+        isLeaf(): boolean;
+        updateCounts(): void;
+        private execWalk;
+        private skipChild;
+        walk(rangeStart: number, rangeLength: number, walkFns: LineIndexWalker): void;
+        charOffsetToLineInfo(lineNumberAccumulator: number, relativePosition: number): {
+            oneBasedLine: number;
+            zeroBasedColumn: number;
+            lineText: string | undefined;
+        };
+        lineNumberToInfo(relativeOneBasedLine: number, positionAccumulator: number): {
+            position: number;
+            leaf: LineLeaf | undefined;
+        };
+        private splitAfter;
+        remove(child: LineCollection): void;
+        private findChildIndex;
+        insertAt(child: LineCollection, nodes: LineCollection[]): LineNode[];
+        add(collection: LineCollection): void;
+        charCount(): number;
+        lineCount(): number;
+    }
+    class LineLeaf implements LineCollection {
+        text: string;
+        constructor(text: string);
+        isLeaf(): boolean;
+        walk(rangeStart: number, rangeLength: number, walkFns: LineIndexWalker): void;
+        charCount(): number;
+        lineCount(): number;
+    }
+}
+//# sourceMappingURL=server.d.ts.map
+//# sourceMappingURL=tsserverlibrary.d.ts.map
 export = ts;
 export as namespace ts;
\ No newline at end of file
diff --git a/tests/baselines/reference/api/typescript.d.ts b/tests/baselines/reference/api/typescript.d.ts
index acbcabf5bef..2c2b7b0deda 100644
--- a/tests/baselines/reference/api/typescript.d.ts
+++ b/tests/baselines/reference/api/typescript.d.ts
@@ -13,5338 +13,12005 @@ See the Apache Version 2.0 License for specific language governing permissions
 and limitations under the License.
 ***************************************************************************** */
 
-declare namespace ts {
-    /**
-     * Type of objects whose values are all of the same type.
-     * The `in` and `for-in` operators can *not* be safely used,
-     * since `Object.prototype` may be modified by outside code.
-     */
-    interface MapLike<T> {
-        [index: string]: T;
-    }
-    /** ES6 Map interface, only read methods included. */
-    interface ReadonlyMap<T> {
-        get(key: string): T | undefined;
-        has(key: string): boolean;
-        forEach(action: (value: T, key: string) => void): void;
-        readonly size: number;
-        keys(): Iterator<string>;
-        values(): Iterator<T>;
-        entries(): Iterator<[string, T]>;
-    }
-    /** ES6 Map interface. */
-    interface Map<T> extends ReadonlyMap<T> {
-        set(key: string, value: T): this;
-        delete(key: string): boolean;
-        clear(): void;
-    }
-    /** ES6 Iterator type. */
-    interface Iterator<T> {
-        next(): {
-            value: T;
-            done: false;
-        } | {
-            value: never;
-            done: true;
-        };
-    }
-    /** Array that is only intended to be pushed to, never read. */
-    interface Push<T> {
-        push(...values: T[]): void;
-    }
-    type Path = string & {
-        __pathBrand: any;
-    };
-    interface TextRange {
-        pos: number;
-        end: number;
-    }
-    type JsDocSyntaxKind = SyntaxKind.EndOfFileToken | SyntaxKind.WhitespaceTrivia | SyntaxKind.AtToken | SyntaxKind.NewLineTrivia | SyntaxKind.AsteriskToken | SyntaxKind.OpenBraceToken | SyntaxKind.CloseBraceToken | SyntaxKind.LessThanToken | SyntaxKind.OpenBracketToken | SyntaxKind.CloseBracketToken | SyntaxKind.EqualsToken | SyntaxKind.CommaToken | SyntaxKind.DotToken | SyntaxKind.Identifier | SyntaxKind.NoSubstitutionTemplateLiteral | SyntaxKind.Unknown;
-    type JsxTokenSyntaxKind = SyntaxKind.LessThanSlashToken | SyntaxKind.EndOfFileToken | SyntaxKind.ConflictMarkerTrivia | SyntaxKind.JsxText | SyntaxKind.JsxTextAllWhiteSpaces | SyntaxKind.OpenBraceToken | SyntaxKind.LessThanToken;
-    enum SyntaxKind {
-        Unknown = 0,
-        EndOfFileToken = 1,
-        SingleLineCommentTrivia = 2,
-        MultiLineCommentTrivia = 3,
-        NewLineTrivia = 4,
-        WhitespaceTrivia = 5,
-        ShebangTrivia = 6,
-        ConflictMarkerTrivia = 7,
-        NumericLiteral = 8,
-        StringLiteral = 9,
-        JsxText = 10,
-        JsxTextAllWhiteSpaces = 11,
-        RegularExpressionLiteral = 12,
-        NoSubstitutionTemplateLiteral = 13,
-        TemplateHead = 14,
-        TemplateMiddle = 15,
-        TemplateTail = 16,
-        OpenBraceToken = 17,
-        CloseBraceToken = 18,
-        OpenParenToken = 19,
-        CloseParenToken = 20,
-        OpenBracketToken = 21,
-        CloseBracketToken = 22,
-        DotToken = 23,
-        DotDotDotToken = 24,
-        SemicolonToken = 25,
-        CommaToken = 26,
-        LessThanToken = 27,
-        LessThanSlashToken = 28,
-        GreaterThanToken = 29,
-        LessThanEqualsToken = 30,
-        GreaterThanEqualsToken = 31,
-        EqualsEqualsToken = 32,
-        ExclamationEqualsToken = 33,
-        EqualsEqualsEqualsToken = 34,
-        ExclamationEqualsEqualsToken = 35,
-        EqualsGreaterThanToken = 36,
-        PlusToken = 37,
-        MinusToken = 38,
-        AsteriskToken = 39,
-        AsteriskAsteriskToken = 40,
-        SlashToken = 41,
-        PercentToken = 42,
-        PlusPlusToken = 43,
-        MinusMinusToken = 44,
-        LessThanLessThanToken = 45,
-        GreaterThanGreaterThanToken = 46,
-        GreaterThanGreaterThanGreaterThanToken = 47,
-        AmpersandToken = 48,
-        BarToken = 49,
-        CaretToken = 50,
-        ExclamationToken = 51,
-        TildeToken = 52,
-        AmpersandAmpersandToken = 53,
-        BarBarToken = 54,
-        QuestionToken = 55,
-        ColonToken = 56,
-        AtToken = 57,
-        EqualsToken = 58,
-        PlusEqualsToken = 59,
-        MinusEqualsToken = 60,
-        AsteriskEqualsToken = 61,
-        AsteriskAsteriskEqualsToken = 62,
-        SlashEqualsToken = 63,
-        PercentEqualsToken = 64,
-        LessThanLessThanEqualsToken = 65,
-        GreaterThanGreaterThanEqualsToken = 66,
-        GreaterThanGreaterThanGreaterThanEqualsToken = 67,
-        AmpersandEqualsToken = 68,
-        BarEqualsToken = 69,
-        CaretEqualsToken = 70,
-        Identifier = 71,
-        BreakKeyword = 72,
-        CaseKeyword = 73,
-        CatchKeyword = 74,
-        ClassKeyword = 75,
-        ConstKeyword = 76,
-        ContinueKeyword = 77,
-        DebuggerKeyword = 78,
-        DefaultKeyword = 79,
-        DeleteKeyword = 80,
-        DoKeyword = 81,
-        ElseKeyword = 82,
-        EnumKeyword = 83,
-        ExportKeyword = 84,
-        ExtendsKeyword = 85,
-        FalseKeyword = 86,
-        FinallyKeyword = 87,
-        ForKeyword = 88,
-        FunctionKeyword = 89,
-        IfKeyword = 90,
-        ImportKeyword = 91,
-        InKeyword = 92,
-        InstanceOfKeyword = 93,
-        NewKeyword = 94,
-        NullKeyword = 95,
-        ReturnKeyword = 96,
-        SuperKeyword = 97,
-        SwitchKeyword = 98,
-        ThisKeyword = 99,
-        ThrowKeyword = 100,
-        TrueKeyword = 101,
-        TryKeyword = 102,
-        TypeOfKeyword = 103,
-        VarKeyword = 104,
-        VoidKeyword = 105,
-        WhileKeyword = 106,
-        WithKeyword = 107,
-        ImplementsKeyword = 108,
-        InterfaceKeyword = 109,
-        LetKeyword = 110,
-        PackageKeyword = 111,
-        PrivateKeyword = 112,
-        ProtectedKeyword = 113,
-        PublicKeyword = 114,
-        StaticKeyword = 115,
-        YieldKeyword = 116,
-        AbstractKeyword = 117,
-        AsKeyword = 118,
-        AnyKeyword = 119,
-        AsyncKeyword = 120,
-        AwaitKeyword = 121,
-        BooleanKeyword = 122,
-        ConstructorKeyword = 123,
-        DeclareKeyword = 124,
-        GetKeyword = 125,
-        InferKeyword = 126,
-        IsKeyword = 127,
-        KeyOfKeyword = 128,
-        ModuleKeyword = 129,
-        NamespaceKeyword = 130,
-        NeverKeyword = 131,
-        ReadonlyKeyword = 132,
-        RequireKeyword = 133,
-        NumberKeyword = 134,
-        ObjectKeyword = 135,
-        SetKeyword = 136,
-        StringKeyword = 137,
-        SymbolKeyword = 138,
-        TypeKeyword = 139,
-        UndefinedKeyword = 140,
-        UniqueKeyword = 141,
-        UnknownKeyword = 142,
-        FromKeyword = 143,
-        GlobalKeyword = 144,
-        OfKeyword = 145,
-        QualifiedName = 146,
-        ComputedPropertyName = 147,
-        TypeParameter = 148,
-        Parameter = 149,
-        Decorator = 150,
-        PropertySignature = 151,
-        PropertyDeclaration = 152,
-        MethodSignature = 153,
-        MethodDeclaration = 154,
-        Constructor = 155,
-        GetAccessor = 156,
-        SetAccessor = 157,
-        CallSignature = 158,
-        ConstructSignature = 159,
-        IndexSignature = 160,
-        TypePredicate = 161,
-        TypeReference = 162,
-        FunctionType = 163,
-        ConstructorType = 164,
-        TypeQuery = 165,
-        TypeLiteral = 166,
-        ArrayType = 167,
-        TupleType = 168,
-        UnionType = 169,
-        IntersectionType = 170,
-        ConditionalType = 171,
-        InferType = 172,
-        ParenthesizedType = 173,
-        ThisType = 174,
-        TypeOperator = 175,
-        IndexedAccessType = 176,
-        MappedType = 177,
-        LiteralType = 178,
-        ImportType = 179,
-        ObjectBindingPattern = 180,
-        ArrayBindingPattern = 181,
-        BindingElement = 182,
-        ArrayLiteralExpression = 183,
-        ObjectLiteralExpression = 184,
-        PropertyAccessExpression = 185,
-        ElementAccessExpression = 186,
-        CallExpression = 187,
-        NewExpression = 188,
-        TaggedTemplateExpression = 189,
-        TypeAssertionExpression = 190,
-        ParenthesizedExpression = 191,
-        FunctionExpression = 192,
-        ArrowFunction = 193,
-        DeleteExpression = 194,
-        TypeOfExpression = 195,
-        VoidExpression = 196,
-        AwaitExpression = 197,
-        PrefixUnaryExpression = 198,
-        PostfixUnaryExpression = 199,
-        BinaryExpression = 200,
-        ConditionalExpression = 201,
-        TemplateExpression = 202,
-        YieldExpression = 203,
-        SpreadElement = 204,
-        ClassExpression = 205,
-        OmittedExpression = 206,
-        ExpressionWithTypeArguments = 207,
-        AsExpression = 208,
-        NonNullExpression = 209,
-        MetaProperty = 210,
-        TemplateSpan = 211,
-        SemicolonClassElement = 212,
-        Block = 213,
-        VariableStatement = 214,
-        EmptyStatement = 215,
-        ExpressionStatement = 216,
-        IfStatement = 217,
-        DoStatement = 218,
-        WhileStatement = 219,
-        ForStatement = 220,
-        ForInStatement = 221,
-        ForOfStatement = 222,
-        ContinueStatement = 223,
-        BreakStatement = 224,
-        ReturnStatement = 225,
-        WithStatement = 226,
-        SwitchStatement = 227,
-        LabeledStatement = 228,
-        ThrowStatement = 229,
-        TryStatement = 230,
-        DebuggerStatement = 231,
-        VariableDeclaration = 232,
-        VariableDeclarationList = 233,
-        FunctionDeclaration = 234,
-        ClassDeclaration = 235,
-        InterfaceDeclaration = 236,
-        TypeAliasDeclaration = 237,
-        EnumDeclaration = 238,
-        ModuleDeclaration = 239,
-        ModuleBlock = 240,
-        CaseBlock = 241,
-        NamespaceExportDeclaration = 242,
-        ImportEqualsDeclaration = 243,
-        ImportDeclaration = 244,
-        ImportClause = 245,
-        NamespaceImport = 246,
-        NamedImports = 247,
-        ImportSpecifier = 248,
-        ExportAssignment = 249,
-        ExportDeclaration = 250,
-        NamedExports = 251,
-        ExportSpecifier = 252,
-        MissingDeclaration = 253,
-        ExternalModuleReference = 254,
-        JsxElement = 255,
-        JsxSelfClosingElement = 256,
-        JsxOpeningElement = 257,
-        JsxClosingElement = 258,
-        JsxFragment = 259,
-        JsxOpeningFragment = 260,
-        JsxClosingFragment = 261,
-        JsxAttribute = 262,
-        JsxAttributes = 263,
-        JsxSpreadAttribute = 264,
-        JsxExpression = 265,
-        CaseClause = 266,
-        DefaultClause = 267,
-        HeritageClause = 268,
-        CatchClause = 269,
-        PropertyAssignment = 270,
-        ShorthandPropertyAssignment = 271,
-        SpreadAssignment = 272,
-        EnumMember = 273,
-        SourceFile = 274,
-        Bundle = 275,
-        UnparsedSource = 276,
-        InputFiles = 277,
-        JSDocTypeExpression = 278,
-        JSDocAllType = 279,
-        JSDocUnknownType = 280,
-        JSDocNullableType = 281,
-        JSDocNonNullableType = 282,
-        JSDocOptionalType = 283,
-        JSDocFunctionType = 284,
-        JSDocVariadicType = 285,
-        JSDocComment = 286,
-        JSDocTypeLiteral = 287,
-        JSDocSignature = 288,
-        JSDocTag = 289,
-        JSDocAugmentsTag = 290,
-        JSDocClassTag = 291,
-        JSDocCallbackTag = 292,
-        JSDocParameterTag = 293,
-        JSDocReturnTag = 294,
-        JSDocTypeTag = 295,
-        JSDocTemplateTag = 296,
-        JSDocTypedefTag = 297,
-        JSDocPropertyTag = 298,
-        SyntaxList = 299,
-        NotEmittedStatement = 300,
-        PartiallyEmittedExpression = 301,
-        CommaListExpression = 302,
-        MergeDeclarationMarker = 303,
-        EndOfDeclarationMarker = 304,
-        Count = 305,
-        FirstAssignment = 58,
-        LastAssignment = 70,
-        FirstCompoundAssignment = 59,
-        LastCompoundAssignment = 70,
-        FirstReservedWord = 72,
-        LastReservedWord = 107,
-        FirstKeyword = 72,
-        LastKeyword = 145,
-        FirstFutureReservedWord = 108,
-        LastFutureReservedWord = 116,
-        FirstTypeNode = 161,
-        LastTypeNode = 179,
-        FirstPunctuation = 17,
-        LastPunctuation = 70,
-        FirstToken = 0,
-        LastToken = 145,
-        FirstTriviaToken = 2,
-        LastTriviaToken = 7,
-        FirstLiteralToken = 8,
-        LastLiteralToken = 13,
-        FirstTemplateToken = 13,
-        LastTemplateToken = 16,
-        FirstBinaryOperator = 27,
-        LastBinaryOperator = 70,
-        FirstNode = 146,
-        FirstJSDocNode = 278,
-        LastJSDocNode = 298,
-        FirstJSDocTagNode = 289,
-        LastJSDocTagNode = 298
-    }
-    enum NodeFlags {
-        None = 0,
-        Let = 1,
-        Const = 2,
-        NestedNamespace = 4,
-        Synthesized = 8,
-        Namespace = 16,
-        ExportContext = 32,
-        ContainsThis = 64,
-        HasImplicitReturn = 128,
-        HasExplicitReturn = 256,
-        GlobalAugmentation = 512,
-        HasAsyncFunctions = 1024,
-        DisallowInContext = 2048,
-        YieldContext = 4096,
-        DecoratorContext = 8192,
-        AwaitContext = 16384,
-        ThisNodeHasError = 32768,
-        JavaScriptFile = 65536,
-        ThisNodeOrAnySubNodesHasError = 131072,
-        HasAggregatedChildData = 262144,
-        JSDoc = 2097152,
-        JsonFile = 16777216,
-        BlockScoped = 3,
-        ReachabilityCheckFlags = 384,
-        ReachabilityAndEmitFlags = 1408,
-        ContextFlags = 12679168,
-        TypeExcludesFlags = 20480
-    }
-    enum ModifierFlags {
-        None = 0,
-        Export = 1,
-        Ambient = 2,
-        Public = 4,
-        Private = 8,
-        Protected = 16,
-        Static = 32,
-        Readonly = 64,
-        Abstract = 128,
-        Async = 256,
-        Default = 512,
-        Const = 2048,
-        HasComputedFlags = 536870912,
-        AccessibilityModifier = 28,
-        ParameterPropertyModifier = 92,
-        NonPublicAccessibilityModifier = 24,
-        TypeScriptModifier = 2270,
-        ExportDefault = 513,
-        All = 3071
-    }
-    enum JsxFlags {
-        None = 0,
-        /** An element from a named property of the JSX.IntrinsicElements interface */
-        IntrinsicNamedElement = 1,
-        /** An element inferred from the string index signature of the JSX.IntrinsicElements interface */
-        IntrinsicIndexedElement = 2,
-        IntrinsicElement = 3
-    }
-    interface Node extends TextRange {
-        kind: SyntaxKind;
-        flags: NodeFlags;
-        decorators?: NodeArray<Decorator>;
-        modifiers?: ModifiersArray;
-        parent: Node;
-    }
-    interface JSDocContainer {
-    }
-    type HasJSDoc = ParameterDeclaration | CallSignatureDeclaration | ConstructSignatureDeclaration | MethodSignature | PropertySignature | ArrowFunction | ParenthesizedExpression | SpreadAssignment | ShorthandPropertyAssignment | PropertyAssignment | FunctionExpression | LabeledStatement | ExpressionStatement | VariableStatement | FunctionDeclaration | ConstructorDeclaration | MethodDeclaration | PropertyDeclaration | AccessorDeclaration | ClassLikeDeclaration | InterfaceDeclaration | TypeAliasDeclaration | EnumMember | EnumDeclaration | ModuleDeclaration | ImportEqualsDeclaration | IndexSignatureDeclaration | FunctionTypeNode | ConstructorTypeNode | JSDocFunctionType | EndOfFileToken;
-    type HasType = SignatureDeclaration | VariableDeclaration | ParameterDeclaration | PropertySignature | PropertyDeclaration | TypePredicateNode | ParenthesizedTypeNode | TypeOperatorNode | MappedTypeNode | AssertionExpression | TypeAliasDeclaration | JSDocTypeExpression | JSDocNonNullableType | JSDocNullableType | JSDocOptionalType | JSDocVariadicType;
-    type HasInitializer = HasExpressionInitializer | ForStatement | ForInStatement | ForOfStatement | JsxAttribute;
-    type HasExpressionInitializer = VariableDeclaration | ParameterDeclaration | BindingElement | PropertySignature | PropertyDeclaration | PropertyAssignment | EnumMember;
-    interface NodeArray<T extends Node> extends ReadonlyArray<T>, TextRange {
-        hasTrailingComma?: boolean;
-    }
-    interface Token<TKind extends SyntaxKind> extends Node {
-        kind: TKind;
-    }
-    type DotDotDotToken = Token<SyntaxKind.DotDotDotToken>;
-    type QuestionToken = Token<SyntaxKind.QuestionToken>;
-    type ExclamationToken = Token<SyntaxKind.ExclamationToken>;
-    type ColonToken = Token<SyntaxKind.ColonToken>;
-    type EqualsToken = Token<SyntaxKind.EqualsToken>;
-    type AsteriskToken = Token<SyntaxKind.AsteriskToken>;
-    type EqualsGreaterThanToken = Token<SyntaxKind.EqualsGreaterThanToken>;
-    type EndOfFileToken = Token<SyntaxKind.EndOfFileToken> & JSDocContainer;
-    type AtToken = Token<SyntaxKind.AtToken>;
-    type ReadonlyToken = Token<SyntaxKind.ReadonlyKeyword>;
-    type AwaitKeywordToken = Token<SyntaxKind.AwaitKeyword>;
-    type PlusToken = Token<SyntaxKind.PlusToken>;
-    type MinusToken = Token<SyntaxKind.MinusToken>;
-    type Modifier = Token<SyntaxKind.AbstractKeyword> | Token<SyntaxKind.AsyncKeyword> | Token<SyntaxKind.ConstKeyword> | Token<SyntaxKind.DeclareKeyword> | Token<SyntaxKind.DefaultKeyword> | Token<SyntaxKind.ExportKeyword> | Token<SyntaxKind.PublicKeyword> | Token<SyntaxKind.PrivateKeyword> | Token<SyntaxKind.ProtectedKeyword> | Token<SyntaxKind.ReadonlyKeyword> | Token<SyntaxKind.StaticKeyword>;
-    type ModifiersArray = NodeArray<Modifier>;
-    interface Identifier extends PrimaryExpression, Declaration {
-        kind: SyntaxKind.Identifier;
-        /**
-         * Prefer to use `id.unescapedText`. (Note: This is available only in services, not internally to the TypeScript compiler.)
-         * Text of identifier, but if the identifier begins with two underscores, this will begin with three.
-         */
-        escapedText: __String;
-        originalKeywordKind?: SyntaxKind;
-        isInJSDocNamespace?: boolean;
-    }
-    interface TransientIdentifier extends Identifier {
-        resolvedSymbol: Symbol;
-    }
-    interface QualifiedName extends Node {
-        kind: SyntaxKind.QualifiedName;
-        left: EntityName;
-        right: Identifier;
-    }
-    type EntityName = Identifier | QualifiedName;
-    type PropertyName = Identifier | StringLiteral | NumericLiteral | ComputedPropertyName;
-    type DeclarationName = Identifier | StringLiteral | NumericLiteral | ComputedPropertyName | BindingPattern;
-    interface Declaration extends Node {
-        _declarationBrand: any;
-    }
-    interface NamedDeclaration extends Declaration {
-        name?: DeclarationName;
-    }
-    interface DeclarationStatement extends NamedDeclaration, Statement {
-        name?: Identifier | StringLiteral | NumericLiteral;
-    }
-    interface ComputedPropertyName extends Node {
-        kind: SyntaxKind.ComputedPropertyName;
-        expression: Expression;
-    }
-    interface Decorator extends Node {
-        kind: SyntaxKind.Decorator;
-        parent: NamedDeclaration;
-        expression: LeftHandSideExpression;
-    }
-    interface TypeParameterDeclaration extends NamedDeclaration {
-        kind: SyntaxKind.TypeParameter;
-        parent: DeclarationWithTypeParameters | InferTypeNode;
-        name: Identifier;
-        constraint?: TypeNode;
-        default?: TypeNode;
-        expression?: Expression;
-    }
-    interface SignatureDeclarationBase extends NamedDeclaration, JSDocContainer {
-        kind: SignatureDeclaration["kind"];
-        name?: PropertyName;
-        typeParameters?: NodeArray<TypeParameterDeclaration>;
-        parameters: NodeArray<ParameterDeclaration>;
-        type?: TypeNode;
-    }
-    type SignatureDeclaration = CallSignatureDeclaration | ConstructSignatureDeclaration | MethodSignature | IndexSignatureDeclaration | FunctionTypeNode | ConstructorTypeNode | JSDocFunctionType | FunctionDeclaration | MethodDeclaration | ConstructorDeclaration | AccessorDeclaration | FunctionExpression | ArrowFunction;
-    interface CallSignatureDeclaration extends SignatureDeclarationBase, TypeElement {
-        kind: SyntaxKind.CallSignature;
-    }
-    interface ConstructSignatureDeclaration extends SignatureDeclarationBase, TypeElement {
-        kind: SyntaxKind.ConstructSignature;
-    }
-    type BindingName = Identifier | BindingPattern;
-    interface VariableDeclaration extends NamedDeclaration {
-        kind: SyntaxKind.VariableDeclaration;
-        parent: VariableDeclarationList | CatchClause;
-        name: BindingName;
-        exclamationToken?: ExclamationToken;
-        type?: TypeNode;
-        initializer?: Expression;
-    }
-    interface VariableDeclarationList extends Node {
-        kind: SyntaxKind.VariableDeclarationList;
-        parent: VariableStatement | ForStatement | ForOfStatement | ForInStatement;
-        declarations: NodeArray<VariableDeclaration>;
-    }
-    interface ParameterDeclaration extends NamedDeclaration, JSDocContainer {
-        kind: SyntaxKind.Parameter;
-        parent: SignatureDeclaration;
-        dotDotDotToken?: DotDotDotToken;
-        name: BindingName;
-        questionToken?: QuestionToken;
-        type?: TypeNode;
-        initializer?: Expression;
-    }
-    interface BindingElement extends NamedDeclaration {
-        kind: SyntaxKind.BindingElement;
-        parent: BindingPattern;
-        propertyName?: PropertyName;
-        dotDotDotToken?: DotDotDotToken;
-        name: BindingName;
-        initializer?: Expression;
-    }
-    interface PropertySignature extends TypeElement, JSDocContainer {
-        kind: SyntaxKind.PropertySignature;
-        name: PropertyName;
-        questionToken?: QuestionToken;
-        type?: TypeNode;
-        initializer?: Expression;
-    }
-    interface PropertyDeclaration extends ClassElement, JSDocContainer {
-        kind: SyntaxKind.PropertyDeclaration;
-        parent: ClassLikeDeclaration;
-        name: PropertyName;
-        questionToken?: QuestionToken;
-        exclamationToken?: ExclamationToken;
-        type?: TypeNode;
-        initializer?: Expression;
-    }
-    interface ObjectLiteralElement extends NamedDeclaration {
-        _objectLiteralBrandBrand: any;
-        name?: PropertyName;
-    }
-    type ObjectLiteralElementLike = PropertyAssignment | ShorthandPropertyAssignment | SpreadAssignment | MethodDeclaration | AccessorDeclaration;
-    interface PropertyAssignment extends ObjectLiteralElement, JSDocContainer {
-        parent: ObjectLiteralExpression;
-        kind: SyntaxKind.PropertyAssignment;
-        name: PropertyName;
-        questionToken?: QuestionToken;
-        initializer: Expression;
-    }
-    interface ShorthandPropertyAssignment extends ObjectLiteralElement, JSDocContainer {
-        parent: ObjectLiteralExpression;
-        kind: SyntaxKind.ShorthandPropertyAssignment;
-        name: Identifier;
-        questionToken?: QuestionToken;
-        equalsToken?: Token<SyntaxKind.EqualsToken>;
-        objectAssignmentInitializer?: Expression;
-    }
-    interface SpreadAssignment extends ObjectLiteralElement, JSDocContainer {
-        parent: ObjectLiteralExpression;
-        kind: SyntaxKind.SpreadAssignment;
-        expression: Expression;
-    }
-    type VariableLikeDeclaration = VariableDeclaration | ParameterDeclaration | BindingElement | PropertyDeclaration | PropertyAssignment | PropertySignature | JsxAttribute | ShorthandPropertyAssignment | EnumMember | JSDocPropertyTag | JSDocParameterTag;
-    interface PropertyLikeDeclaration extends NamedDeclaration {
-        name: PropertyName;
-    }
-    interface ObjectBindingPattern extends Node {
-        kind: SyntaxKind.ObjectBindingPattern;
-        parent: VariableDeclaration | ParameterDeclaration | BindingElement;
-        elements: NodeArray<BindingElement>;
-    }
-    interface ArrayBindingPattern extends Node {
-        kind: SyntaxKind.ArrayBindingPattern;
-        parent: VariableDeclaration | ParameterDeclaration | BindingElement;
-        elements: NodeArray<ArrayBindingElement>;
-    }
-    type BindingPattern = ObjectBindingPattern | ArrayBindingPattern;
-    type ArrayBindingElement = BindingElement | OmittedExpression;
-    /**
-     * Several node kinds share function-like features such as a signature,
-     * a name, and a body. These nodes should extend FunctionLikeDeclarationBase.
-     * Examples:
-     * - FunctionDeclaration
-     * - MethodDeclaration
-     * - AccessorDeclaration
-     */
-    interface FunctionLikeDeclarationBase extends SignatureDeclarationBase {
-        _functionLikeDeclarationBrand: any;
-        asteriskToken?: AsteriskToken;
-        questionToken?: QuestionToken;
-        body?: Block | Expression;
-    }
-    type FunctionLikeDeclaration = FunctionDeclaration | MethodDeclaration | GetAccessorDeclaration | SetAccessorDeclaration | ConstructorDeclaration | FunctionExpression | ArrowFunction;
-    /** @deprecated Use SignatureDeclaration */
-    type FunctionLike = SignatureDeclaration;
-    interface FunctionDeclaration extends FunctionLikeDeclarationBase, DeclarationStatement {
-        kind: SyntaxKind.FunctionDeclaration;
-        name?: Identifier;
-        body?: FunctionBody;
-    }
-    interface MethodSignature extends SignatureDeclarationBase, TypeElement {
-        kind: SyntaxKind.MethodSignature;
-        parent: ObjectTypeDeclaration;
-        name: PropertyName;
-    }
-    interface MethodDeclaration extends FunctionLikeDeclarationBase, ClassElement, ObjectLiteralElement, JSDocContainer {
-        kind: SyntaxKind.MethodDeclaration;
-        parent: ClassLikeDeclaration | ObjectLiteralExpression;
-        name: PropertyName;
-        body?: FunctionBody;
-    }
-    interface ConstructorDeclaration extends FunctionLikeDeclarationBase, ClassElement, JSDocContainer {
-        kind: SyntaxKind.Constructor;
-        parent: ClassLikeDeclaration;
-        body?: FunctionBody;
-    }
-    /** For when we encounter a semicolon in a class declaration. ES6 allows these as class elements. */
-    interface SemicolonClassElement extends ClassElement {
-        kind: SyntaxKind.SemicolonClassElement;
-        parent: ClassLikeDeclaration;
-    }
-    interface GetAccessorDeclaration extends FunctionLikeDeclarationBase, ClassElement, ObjectLiteralElement, JSDocContainer {
-        kind: SyntaxKind.GetAccessor;
-        parent: ClassLikeDeclaration | ObjectLiteralExpression;
-        name: PropertyName;
-        body?: FunctionBody;
-    }
-    interface SetAccessorDeclaration extends FunctionLikeDeclarationBase, ClassElement, ObjectLiteralElement, JSDocContainer {
-        kind: SyntaxKind.SetAccessor;
-        parent: ClassLikeDeclaration | ObjectLiteralExpression;
-        name: PropertyName;
-        body?: FunctionBody;
-    }
-    type AccessorDeclaration = GetAccessorDeclaration | SetAccessorDeclaration;
-    interface IndexSignatureDeclaration extends SignatureDeclarationBase, ClassElement, TypeElement {
-        kind: SyntaxKind.IndexSignature;
-        parent: ObjectTypeDeclaration;
-    }
-    interface TypeNode extends Node {
-        _typeNodeBrand: any;
-    }
-    interface KeywordTypeNode extends TypeNode {
-        kind: SyntaxKind.AnyKeyword | SyntaxKind.UnknownKeyword | SyntaxKind.NumberKeyword | SyntaxKind.ObjectKeyword | SyntaxKind.BooleanKeyword | SyntaxKind.StringKeyword | SyntaxKind.SymbolKeyword | SyntaxKind.ThisKeyword | SyntaxKind.VoidKeyword | SyntaxKind.UndefinedKeyword | SyntaxKind.NullKeyword | SyntaxKind.NeverKeyword;
-    }
-    interface ImportTypeNode extends NodeWithTypeArguments {
-        kind: SyntaxKind.ImportType;
-        isTypeOf?: boolean;
-        argument: TypeNode;
-        qualifier?: EntityName;
-    }
-    interface ThisTypeNode extends TypeNode {
-        kind: SyntaxKind.ThisType;
-    }
-    type FunctionOrConstructorTypeNode = FunctionTypeNode | ConstructorTypeNode;
-    interface FunctionOrConstructorTypeNodeBase extends TypeNode, SignatureDeclarationBase {
-        kind: SyntaxKind.FunctionType | SyntaxKind.ConstructorType;
-        type: TypeNode;
-    }
-    interface FunctionTypeNode extends FunctionOrConstructorTypeNodeBase {
-        kind: SyntaxKind.FunctionType;
-    }
-    interface ConstructorTypeNode extends FunctionOrConstructorTypeNodeBase {
-        kind: SyntaxKind.ConstructorType;
-    }
-    interface NodeWithTypeArguments extends TypeNode {
-        typeArguments?: NodeArray<TypeNode>;
-    }
-    type TypeReferenceType = TypeReferenceNode | ExpressionWithTypeArguments;
-    interface TypeReferenceNode extends NodeWithTypeArguments {
-        kind: SyntaxKind.TypeReference;
-        typeName: EntityName;
-    }
-    interface TypePredicateNode extends TypeNode {
-        kind: SyntaxKind.TypePredicate;
-        parent: SignatureDeclaration;
-        parameterName: Identifier | ThisTypeNode;
-        type: TypeNode;
-    }
-    interface TypeQueryNode extends TypeNode {
-        kind: SyntaxKind.TypeQuery;
-        exprName: EntityName;
-    }
-    interface TypeLiteralNode extends TypeNode, Declaration {
-        kind: SyntaxKind.TypeLiteral;
-        members: NodeArray<TypeElement>;
-    }
-    interface ArrayTypeNode extends TypeNode {
-        kind: SyntaxKind.ArrayType;
-        elementType: TypeNode;
-    }
-    interface TupleTypeNode extends TypeNode {
-        kind: SyntaxKind.TupleType;
-        elementTypes: NodeArray<TypeNode>;
-    }
-    type UnionOrIntersectionTypeNode = UnionTypeNode | IntersectionTypeNode;
-    interface UnionTypeNode extends TypeNode {
-        kind: SyntaxKind.UnionType;
-        types: NodeArray<TypeNode>;
-    }
-    interface IntersectionTypeNode extends TypeNode {
-        kind: SyntaxKind.IntersectionType;
-        types: NodeArray<TypeNode>;
-    }
-    interface ConditionalTypeNode extends TypeNode {
-        kind: SyntaxKind.ConditionalType;
-        checkType: TypeNode;
-        extendsType: TypeNode;
-        trueType: TypeNode;
-        falseType: TypeNode;
-    }
-    interface InferTypeNode extends TypeNode {
-        kind: SyntaxKind.InferType;
-        typeParameter: TypeParameterDeclaration;
-    }
-    interface ParenthesizedTypeNode extends TypeNode {
-        kind: SyntaxKind.ParenthesizedType;
-        type: TypeNode;
-    }
-    interface TypeOperatorNode extends TypeNode {
-        kind: SyntaxKind.TypeOperator;
-        operator: SyntaxKind.KeyOfKeyword | SyntaxKind.UniqueKeyword;
-        type: TypeNode;
-    }
-    interface IndexedAccessTypeNode extends TypeNode {
-        kind: SyntaxKind.IndexedAccessType;
-        objectType: TypeNode;
-        indexType: TypeNode;
-    }
-    interface MappedTypeNode extends TypeNode, Declaration {
-        kind: SyntaxKind.MappedType;
-        readonlyToken?: ReadonlyToken | PlusToken | MinusToken;
-        typeParameter: TypeParameterDeclaration;
-        questionToken?: QuestionToken | PlusToken | MinusToken;
-        type?: TypeNode;
-    }
-    interface LiteralTypeNode extends TypeNode {
-        kind: SyntaxKind.LiteralType;
-        literal: BooleanLiteral | LiteralExpression | PrefixUnaryExpression;
-    }
-    interface StringLiteral extends LiteralExpression {
-        kind: SyntaxKind.StringLiteral;
-    }
-    type StringLiteralLike = StringLiteral | NoSubstitutionTemplateLiteral;
-    interface Expression extends Node {
-        _expressionBrand: any;
-    }
-    interface OmittedExpression extends Expression {
-        kind: SyntaxKind.OmittedExpression;
-    }
-    interface PartiallyEmittedExpression extends LeftHandSideExpression {
-        kind: SyntaxKind.PartiallyEmittedExpression;
-        expression: Expression;
-    }
-    interface UnaryExpression extends Expression {
-        _unaryExpressionBrand: any;
-    }
-    /** Deprecated, please use UpdateExpression */
-    type IncrementExpression = UpdateExpression;
-    interface UpdateExpression extends UnaryExpression {
-        _updateExpressionBrand: any;
-    }
-    type PrefixUnaryOperator = SyntaxKind.PlusPlusToken | SyntaxKind.MinusMinusToken | SyntaxKind.PlusToken | SyntaxKind.MinusToken | SyntaxKind.TildeToken | SyntaxKind.ExclamationToken;
-    interface PrefixUnaryExpression extends UpdateExpression {
-        kind: SyntaxKind.PrefixUnaryExpression;
-        operator: PrefixUnaryOperator;
-        operand: UnaryExpression;
-    }
-    type PostfixUnaryOperator = SyntaxKind.PlusPlusToken | SyntaxKind.MinusMinusToken;
-    interface PostfixUnaryExpression extends UpdateExpression {
-        kind: SyntaxKind.PostfixUnaryExpression;
-        operand: LeftHandSideExpression;
-        operator: PostfixUnaryOperator;
-    }
-    interface LeftHandSideExpression extends UpdateExpression {
-        _leftHandSideExpressionBrand: any;
-    }
-    interface MemberExpression extends LeftHandSideExpression {
-        _memberExpressionBrand: any;
-    }
-    interface PrimaryExpression extends MemberExpression {
-        _primaryExpressionBrand: any;
-    }
-    interface NullLiteral extends PrimaryExpression, TypeNode {
-        kind: SyntaxKind.NullKeyword;
-    }
-    interface BooleanLiteral extends PrimaryExpression, TypeNode {
-        kind: SyntaxKind.TrueKeyword | SyntaxKind.FalseKeyword;
-    }
-    interface ThisExpression extends PrimaryExpression, KeywordTypeNode {
-        kind: SyntaxKind.ThisKeyword;
-    }
-    interface SuperExpression extends PrimaryExpression {
-        kind: SyntaxKind.SuperKeyword;
-    }
-    interface ImportExpression extends PrimaryExpression {
-        kind: SyntaxKind.ImportKeyword;
-    }
-    interface DeleteExpression extends UnaryExpression {
-        kind: SyntaxKind.DeleteExpression;
-        expression: UnaryExpression;
-    }
-    interface TypeOfExpression extends UnaryExpression {
-        kind: SyntaxKind.TypeOfExpression;
-        expression: UnaryExpression;
-    }
-    interface VoidExpression extends UnaryExpression {
-        kind: SyntaxKind.VoidExpression;
-        expression: UnaryExpression;
-    }
-    interface AwaitExpression extends UnaryExpression {
-        kind: SyntaxKind.AwaitExpression;
-        expression: UnaryExpression;
-    }
-    interface YieldExpression extends Expression {
-        kind: SyntaxKind.YieldExpression;
-        asteriskToken?: AsteriskToken;
-        expression?: Expression;
-    }
-    type ExponentiationOperator = SyntaxKind.AsteriskAsteriskToken;
-    type MultiplicativeOperator = SyntaxKind.AsteriskToken | SyntaxKind.SlashToken | SyntaxKind.PercentToken;
-    type MultiplicativeOperatorOrHigher = ExponentiationOperator | MultiplicativeOperator;
-    type AdditiveOperator = SyntaxKind.PlusToken | SyntaxKind.MinusToken;
-    type AdditiveOperatorOrHigher = MultiplicativeOperatorOrHigher | AdditiveOperator;
-    type ShiftOperator = SyntaxKind.LessThanLessThanToken | SyntaxKind.GreaterThanGreaterThanToken | SyntaxKind.GreaterThanGreaterThanGreaterThanToken;
-    type ShiftOperatorOrHigher = AdditiveOperatorOrHigher | ShiftOperator;
-    type RelationalOperator = SyntaxKind.LessThanToken | SyntaxKind.LessThanEqualsToken | SyntaxKind.GreaterThanToken | SyntaxKind.GreaterThanEqualsToken | SyntaxKind.InstanceOfKeyword | SyntaxKind.InKeyword;
-    type RelationalOperatorOrHigher = ShiftOperatorOrHigher | RelationalOperator;
-    type EqualityOperator = SyntaxKind.EqualsEqualsToken | SyntaxKind.EqualsEqualsEqualsToken | SyntaxKind.ExclamationEqualsEqualsToken | SyntaxKind.ExclamationEqualsToken;
-    type EqualityOperatorOrHigher = RelationalOperatorOrHigher | EqualityOperator;
-    type BitwiseOperator = SyntaxKind.AmpersandToken | SyntaxKind.BarToken | SyntaxKind.CaretToken;
-    type BitwiseOperatorOrHigher = EqualityOperatorOrHigher | BitwiseOperator;
-    type LogicalOperator = SyntaxKind.AmpersandAmpersandToken | SyntaxKind.BarBarToken;
-    type LogicalOperatorOrHigher = BitwiseOperatorOrHigher | LogicalOperator;
-    type CompoundAssignmentOperator = SyntaxKind.PlusEqualsToken | SyntaxKind.MinusEqualsToken | SyntaxKind.AsteriskAsteriskEqualsToken | SyntaxKind.AsteriskEqualsToken | SyntaxKind.SlashEqualsToken | SyntaxKind.PercentEqualsToken | SyntaxKind.AmpersandEqualsToken | SyntaxKind.BarEqualsToken | SyntaxKind.CaretEqualsToken | SyntaxKind.LessThanLessThanEqualsToken | SyntaxKind.GreaterThanGreaterThanGreaterThanEqualsToken | SyntaxKind.GreaterThanGreaterThanEqualsToken;
-    type AssignmentOperator = SyntaxKind.EqualsToken | CompoundAssignmentOperator;
-    type AssignmentOperatorOrHigher = LogicalOperatorOrHigher | AssignmentOperator;
-    type BinaryOperator = AssignmentOperatorOrHigher | SyntaxKind.CommaToken;
-    type BinaryOperatorToken = Token<BinaryOperator>;
-    interface BinaryExpression extends Expression, Declaration {
-        kind: SyntaxKind.BinaryExpression;
-        left: Expression;
-        operatorToken: BinaryOperatorToken;
-        right: Expression;
-    }
-    type AssignmentOperatorToken = Token<AssignmentOperator>;
-    interface AssignmentExpression<TOperator extends AssignmentOperatorToken> extends BinaryExpression {
-        left: LeftHandSideExpression;
-        operatorToken: TOperator;
-    }
-    interface ObjectDestructuringAssignment extends AssignmentExpression<EqualsToken> {
-        left: ObjectLiteralExpression;
-    }
-    interface ArrayDestructuringAssignment extends AssignmentExpression<EqualsToken> {
-        left: ArrayLiteralExpression;
-    }
-    type DestructuringAssignment = ObjectDestructuringAssignment | ArrayDestructuringAssignment;
-    type BindingOrAssignmentElement = VariableDeclaration | ParameterDeclaration | BindingElement | PropertyAssignment | ShorthandPropertyAssignment | SpreadAssignment | OmittedExpression | SpreadElement | ArrayLiteralExpression | ObjectLiteralExpression | AssignmentExpression<EqualsToken> | Identifier | PropertyAccessExpression | ElementAccessExpression;
-    type BindingOrAssignmentElementRestIndicator = DotDotDotToken | SpreadElement | SpreadAssignment;
-    type BindingOrAssignmentElementTarget = BindingOrAssignmentPattern | Identifier | PropertyAccessExpression | ElementAccessExpression | OmittedExpression;
-    type ObjectBindingOrAssignmentPattern = ObjectBindingPattern | ObjectLiteralExpression;
-    type ArrayBindingOrAssignmentPattern = ArrayBindingPattern | ArrayLiteralExpression;
-    type AssignmentPattern = ObjectLiteralExpression | ArrayLiteralExpression;
-    type BindingOrAssignmentPattern = ObjectBindingOrAssignmentPattern | ArrayBindingOrAssignmentPattern;
-    interface ConditionalExpression extends Expression {
-        kind: SyntaxKind.ConditionalExpression;
-        condition: Expression;
-        questionToken: QuestionToken;
-        whenTrue: Expression;
-        colonToken: ColonToken;
-        whenFalse: Expression;
-    }
-    type FunctionBody = Block;
-    type ConciseBody = FunctionBody | Expression;
-    interface FunctionExpression extends PrimaryExpression, FunctionLikeDeclarationBase, JSDocContainer {
-        kind: SyntaxKind.FunctionExpression;
-        name?: Identifier;
-        body: FunctionBody;
-    }
-    interface ArrowFunction extends Expression, FunctionLikeDeclarationBase, JSDocContainer {
-        kind: SyntaxKind.ArrowFunction;
-        equalsGreaterThanToken: EqualsGreaterThanToken;
-        body: ConciseBody;
-        name: never;
-    }
-    interface LiteralLikeNode extends Node {
-        text: string;
-        isUnterminated?: boolean;
-        hasExtendedUnicodeEscape?: boolean;
-    }
-    interface LiteralExpression extends LiteralLikeNode, PrimaryExpression {
-        _literalExpressionBrand: any;
-    }
-    interface RegularExpressionLiteral extends LiteralExpression {
-        kind: SyntaxKind.RegularExpressionLiteral;
-    }
-    interface NoSubstitutionTemplateLiteral extends LiteralExpression {
-        kind: SyntaxKind.NoSubstitutionTemplateLiteral;
-    }
-    interface NumericLiteral extends LiteralExpression {
-        kind: SyntaxKind.NumericLiteral;
-    }
-    interface TemplateHead extends LiteralLikeNode {
-        kind: SyntaxKind.TemplateHead;
-        parent: TemplateExpression;
-    }
-    interface TemplateMiddle extends LiteralLikeNode {
-        kind: SyntaxKind.TemplateMiddle;
-        parent: TemplateSpan;
-    }
-    interface TemplateTail extends LiteralLikeNode {
-        kind: SyntaxKind.TemplateTail;
-        parent: TemplateSpan;
-    }
-    type TemplateLiteral = TemplateExpression | NoSubstitutionTemplateLiteral;
-    interface TemplateExpression extends PrimaryExpression {
-        kind: SyntaxKind.TemplateExpression;
-        head: TemplateHead;
-        templateSpans: NodeArray<TemplateSpan>;
-    }
-    interface TemplateSpan extends Node {
-        kind: SyntaxKind.TemplateSpan;
-        parent: TemplateExpression;
-        expression: Expression;
-        literal: TemplateMiddle | TemplateTail;
-    }
-    interface ParenthesizedExpression extends PrimaryExpression, JSDocContainer {
-        kind: SyntaxKind.ParenthesizedExpression;
-        expression: Expression;
-    }
-    interface ArrayLiteralExpression extends PrimaryExpression {
-        kind: SyntaxKind.ArrayLiteralExpression;
-        elements: NodeArray<Expression>;
-    }
-    interface SpreadElement extends Expression {
-        kind: SyntaxKind.SpreadElement;
-        parent: ArrayLiteralExpression | CallExpression | NewExpression;
-        expression: Expression;
-    }
-    /**
-     * This interface is a base interface for ObjectLiteralExpression and JSXAttributes to extend from. JSXAttributes is similar to
-     * ObjectLiteralExpression in that it contains array of properties; however, JSXAttributes' properties can only be
-     * JSXAttribute or JSXSpreadAttribute. ObjectLiteralExpression, on the other hand, can only have properties of type
-     * ObjectLiteralElement (e.g. PropertyAssignment, ShorthandPropertyAssignment etc.)
-     */
-    interface ObjectLiteralExpressionBase<T extends ObjectLiteralElement> extends PrimaryExpression, Declaration {
-        properties: NodeArray<T>;
-    }
-    interface ObjectLiteralExpression extends ObjectLiteralExpressionBase<ObjectLiteralElementLike> {
-        kind: SyntaxKind.ObjectLiteralExpression;
-    }
-    type EntityNameExpression = Identifier | PropertyAccessEntityNameExpression;
-    type EntityNameOrEntityNameExpression = EntityName | EntityNameExpression;
-    interface PropertyAccessExpression extends MemberExpression, NamedDeclaration {
-        kind: SyntaxKind.PropertyAccessExpression;
-        expression: LeftHandSideExpression;
-        name: Identifier;
-    }
-    interface SuperPropertyAccessExpression extends PropertyAccessExpression {
-        expression: SuperExpression;
-    }
-    /** Brand for a PropertyAccessExpression which, like a QualifiedName, consists of a sequence of identifiers separated by dots. */
-    interface PropertyAccessEntityNameExpression extends PropertyAccessExpression {
-        _propertyAccessExpressionLikeQualifiedNameBrand?: any;
-        expression: EntityNameExpression;
-    }
-    interface ElementAccessExpression extends MemberExpression {
-        kind: SyntaxKind.ElementAccessExpression;
-        expression: LeftHandSideExpression;
-        argumentExpression: Expression;
-    }
-    interface SuperElementAccessExpression extends ElementAccessExpression {
-        expression: SuperExpression;
-    }
-    type SuperProperty = SuperPropertyAccessExpression | SuperElementAccessExpression;
-    interface CallExpression extends LeftHandSideExpression, Declaration {
-        kind: SyntaxKind.CallExpression;
-        expression: LeftHandSideExpression;
-        typeArguments?: NodeArray<TypeNode>;
-        arguments: NodeArray<Expression>;
-    }
-    interface SuperCall extends CallExpression {
-        expression: SuperExpression;
-    }
-    interface ImportCall extends CallExpression {
-        expression: ImportExpression;
-    }
-    interface ExpressionWithTypeArguments extends NodeWithTypeArguments {
-        kind: SyntaxKind.ExpressionWithTypeArguments;
-        parent: HeritageClause;
-        expression: LeftHandSideExpression;
-    }
-    interface NewExpression extends PrimaryExpression, Declaration {
-        kind: SyntaxKind.NewExpression;
-        expression: LeftHandSideExpression;
-        typeArguments?: NodeArray<TypeNode>;
-        arguments?: NodeArray<Expression>;
-    }
-    interface TaggedTemplateExpression extends MemberExpression {
-        kind: SyntaxKind.TaggedTemplateExpression;
-        tag: LeftHandSideExpression;
-        typeArguments?: NodeArray<TypeNode>;
-        template: TemplateLiteral;
-    }
-    type CallLikeExpression = CallExpression | NewExpression | TaggedTemplateExpression | Decorator | JsxOpeningLikeElement;
-    interface AsExpression extends Expression {
-        kind: SyntaxKind.AsExpression;
-        expression: Expression;
-        type: TypeNode;
-    }
-    interface TypeAssertion extends UnaryExpression {
-        kind: SyntaxKind.TypeAssertionExpression;
-        type: TypeNode;
-        expression: UnaryExpression;
-    }
-    type AssertionExpression = TypeAssertion | AsExpression;
-    interface NonNullExpression extends LeftHandSideExpression {
-        kind: SyntaxKind.NonNullExpression;
-        expression: Expression;
-    }
-    interface MetaProperty extends PrimaryExpression {
-        kind: SyntaxKind.MetaProperty;
-        keywordToken: SyntaxKind.NewKeyword | SyntaxKind.ImportKeyword;
-        name: Identifier;
-    }
-    interface JsxElement extends PrimaryExpression {
-        kind: SyntaxKind.JsxElement;
-        openingElement: JsxOpeningElement;
-        children: NodeArray<JsxChild>;
-        closingElement: JsxClosingElement;
-    }
-    type JsxOpeningLikeElement = JsxSelfClosingElement | JsxOpeningElement;
-    type JsxAttributeLike = JsxAttribute | JsxSpreadAttribute;
-    type JsxTagNameExpression = PrimaryExpression | PropertyAccessExpression;
-    interface JsxAttributes extends ObjectLiteralExpressionBase<JsxAttributeLike> {
-        parent: JsxOpeningLikeElement;
-    }
-    interface JsxOpeningElement extends Expression {
-        kind: SyntaxKind.JsxOpeningElement;
-        parent: JsxElement;
-        tagName: JsxTagNameExpression;
-        typeArguments?: NodeArray<TypeNode>;
-        attributes: JsxAttributes;
-    }
-    interface JsxSelfClosingElement extends PrimaryExpression {
-        kind: SyntaxKind.JsxSelfClosingElement;
-        tagName: JsxTagNameExpression;
-        typeArguments?: NodeArray<TypeNode>;
-        attributes: JsxAttributes;
-    }
-    interface JsxFragment extends PrimaryExpression {
-        kind: SyntaxKind.JsxFragment;
-        openingFragment: JsxOpeningFragment;
-        children: NodeArray<JsxChild>;
-        closingFragment: JsxClosingFragment;
-    }
-    interface JsxOpeningFragment extends Expression {
-        kind: SyntaxKind.JsxOpeningFragment;
-        parent: JsxFragment;
-    }
-    interface JsxClosingFragment extends Expression {
-        kind: SyntaxKind.JsxClosingFragment;
-        parent: JsxFragment;
-    }
-    interface JsxAttribute extends ObjectLiteralElement {
-        kind: SyntaxKind.JsxAttribute;
-        parent: JsxAttributes;
-        name: Identifier;
-        initializer?: StringLiteral | JsxExpression;
-    }
-    interface JsxSpreadAttribute extends ObjectLiteralElement {
-        kind: SyntaxKind.JsxSpreadAttribute;
-        parent: JsxAttributes;
-        expression: Expression;
-    }
-    interface JsxClosingElement extends Node {
-        kind: SyntaxKind.JsxClosingElement;
-        parent: JsxElement;
-        tagName: JsxTagNameExpression;
-    }
-    interface JsxExpression extends Expression {
-        kind: SyntaxKind.JsxExpression;
-        parent: JsxElement | JsxAttributeLike;
-        dotDotDotToken?: Token<SyntaxKind.DotDotDotToken>;
-        expression?: Expression;
-    }
-    interface JsxText extends Node {
-        kind: SyntaxKind.JsxText;
-        containsOnlyWhiteSpaces: boolean;
-        parent: JsxElement;
-    }
-    type JsxChild = JsxText | JsxExpression | JsxElement | JsxSelfClosingElement | JsxFragment;
-    interface Statement extends Node {
-        _statementBrand: any;
-    }
-    interface NotEmittedStatement extends Statement {
-        kind: SyntaxKind.NotEmittedStatement;
-    }
-    /**
-     * A list of comma-separated expressions. This node is only created by transformations.
-     */
-    interface CommaListExpression extends Expression {
-        kind: SyntaxKind.CommaListExpression;
-        elements: NodeArray<Expression>;
-    }
-    interface EmptyStatement extends Statement {
-        kind: SyntaxKind.EmptyStatement;
-    }
-    interface DebuggerStatement extends Statement {
-        kind: SyntaxKind.DebuggerStatement;
-    }
-    interface MissingDeclaration extends DeclarationStatement {
-        kind: SyntaxKind.MissingDeclaration;
-        name?: Identifier;
-    }
-    type BlockLike = SourceFile | Block | ModuleBlock | CaseOrDefaultClause;
-    interface Block extends Statement {
-        kind: SyntaxKind.Block;
-        statements: NodeArray<Statement>;
-    }
-    interface VariableStatement extends Statement, JSDocContainer {
-        kind: SyntaxKind.VariableStatement;
-        declarationList: VariableDeclarationList;
-    }
-    interface ExpressionStatement extends Statement, JSDocContainer {
-        kind: SyntaxKind.ExpressionStatement;
-        expression: Expression;
-    }
-    interface IfStatement extends Statement {
-        kind: SyntaxKind.IfStatement;
-        expression: Expression;
-        thenStatement: Statement;
-        elseStatement?: Statement;
-    }
-    interface IterationStatement extends Statement {
-        statement: Statement;
-    }
-    interface DoStatement extends IterationStatement {
-        kind: SyntaxKind.DoStatement;
-        expression: Expression;
-    }
-    interface WhileStatement extends IterationStatement {
-        kind: SyntaxKind.WhileStatement;
-        expression: Expression;
-    }
-    type ForInitializer = VariableDeclarationList | Expression;
-    interface ForStatement extends IterationStatement {
-        kind: SyntaxKind.ForStatement;
-        initializer?: ForInitializer;
-        condition?: Expression;
-        incrementor?: Expression;
-    }
-    type ForInOrOfStatement = ForInStatement | ForOfStatement;
-    interface ForInStatement extends IterationStatement {
-        kind: SyntaxKind.ForInStatement;
-        initializer: ForInitializer;
-        expression: Expression;
-    }
-    interface ForOfStatement extends IterationStatement {
-        kind: SyntaxKind.ForOfStatement;
-        awaitModifier?: AwaitKeywordToken;
-        initializer: ForInitializer;
-        expression: Expression;
-    }
-    interface BreakStatement extends Statement {
-        kind: SyntaxKind.BreakStatement;
-        label?: Identifier;
-    }
-    interface ContinueStatement extends Statement {
-        kind: SyntaxKind.ContinueStatement;
-        label?: Identifier;
-    }
-    type BreakOrContinueStatement = BreakStatement | ContinueStatement;
-    interface ReturnStatement extends Statement {
-        kind: SyntaxKind.ReturnStatement;
-        expression?: Expression;
-    }
-    interface WithStatement extends Statement {
-        kind: SyntaxKind.WithStatement;
-        expression: Expression;
-        statement: Statement;
-    }
-    interface SwitchStatement extends Statement {
-        kind: SyntaxKind.SwitchStatement;
-        expression: Expression;
-        caseBlock: CaseBlock;
-        possiblyExhaustive?: boolean;
-    }
-    interface CaseBlock extends Node {
-        kind: SyntaxKind.CaseBlock;
-        parent: SwitchStatement;
-        clauses: NodeArray<CaseOrDefaultClause>;
-    }
-    interface CaseClause extends Node {
-        kind: SyntaxKind.CaseClause;
-        parent: CaseBlock;
-        expression: Expression;
-        statements: NodeArray<Statement>;
-    }
-    interface DefaultClause extends Node {
-        kind: SyntaxKind.DefaultClause;
-        parent: CaseBlock;
-        statements: NodeArray<Statement>;
-    }
-    type CaseOrDefaultClause = CaseClause | DefaultClause;
-    interface LabeledStatement extends Statement, JSDocContainer {
-        kind: SyntaxKind.LabeledStatement;
-        label: Identifier;
-        statement: Statement;
-    }
-    interface ThrowStatement extends Statement {
-        kind: SyntaxKind.ThrowStatement;
-        expression?: Expression;
-    }
-    interface TryStatement extends Statement {
-        kind: SyntaxKind.TryStatement;
-        tryBlock: Block;
-        catchClause?: CatchClause;
-        finallyBlock?: Block;
-    }
-    interface CatchClause extends Node {
-        kind: SyntaxKind.CatchClause;
-        parent: TryStatement;
-        variableDeclaration?: VariableDeclaration;
-        block: Block;
-    }
-    type ObjectTypeDeclaration = ClassLikeDeclaration | InterfaceDeclaration | TypeLiteralNode;
-    type DeclarationWithTypeParameters = SignatureDeclaration | ClassLikeDeclaration | InterfaceDeclaration | TypeAliasDeclaration | JSDocTemplateTag | JSDocTypedefTag | JSDocCallbackTag | JSDocSignature;
-    interface ClassLikeDeclarationBase extends NamedDeclaration, JSDocContainer {
-        kind: SyntaxKind.ClassDeclaration | SyntaxKind.ClassExpression;
-        name?: Identifier;
-        typeParameters?: NodeArray<TypeParameterDeclaration>;
-        heritageClauses?: NodeArray<HeritageClause>;
-        members: NodeArray<ClassElement>;
-    }
-    interface ClassDeclaration extends ClassLikeDeclarationBase, DeclarationStatement {
-        kind: SyntaxKind.ClassDeclaration;
-        /** May be undefined in `export default class { ... }`. */
-        name?: Identifier;
-    }
-    interface ClassExpression extends ClassLikeDeclarationBase, PrimaryExpression {
-        kind: SyntaxKind.ClassExpression;
-    }
-    type ClassLikeDeclaration = ClassDeclaration | ClassExpression;
-    interface ClassElement extends NamedDeclaration {
-        _classElementBrand: any;
-        name?: PropertyName;
-    }
-    interface TypeElement extends NamedDeclaration {
-        _typeElementBrand: any;
-        name?: PropertyName;
-        questionToken?: QuestionToken;
-    }
-    interface InterfaceDeclaration extends DeclarationStatement, JSDocContainer {
-        kind: SyntaxKind.InterfaceDeclaration;
-        name: Identifier;
-        typeParameters?: NodeArray<TypeParameterDeclaration>;
-        heritageClauses?: NodeArray<HeritageClause>;
-        members: NodeArray<TypeElement>;
-    }
-    interface HeritageClause extends Node {
-        kind: SyntaxKind.HeritageClause;
-        parent: InterfaceDeclaration | ClassLikeDeclaration;
-        token: SyntaxKind.ExtendsKeyword | SyntaxKind.ImplementsKeyword;
-        types: NodeArray<ExpressionWithTypeArguments>;
-    }
-    interface TypeAliasDeclaration extends DeclarationStatement, JSDocContainer {
-        kind: SyntaxKind.TypeAliasDeclaration;
-        name: Identifier;
-        typeParameters?: NodeArray<TypeParameterDeclaration>;
-        type: TypeNode;
-    }
-    interface EnumMember extends NamedDeclaration, JSDocContainer {
-        kind: SyntaxKind.EnumMember;
-        parent: EnumDeclaration;
-        name: PropertyName;
-        initializer?: Expression;
-    }
-    interface EnumDeclaration extends DeclarationStatement, JSDocContainer {
-        kind: SyntaxKind.EnumDeclaration;
-        name: Identifier;
-        members: NodeArray<EnumMember>;
-    }
-    type ModuleName = Identifier | StringLiteral;
-    type ModuleBody = NamespaceBody | JSDocNamespaceBody;
-    interface ModuleDeclaration extends DeclarationStatement, JSDocContainer {
-        kind: SyntaxKind.ModuleDeclaration;
-        parent: ModuleBody | SourceFile;
-        name: ModuleName;
-        body?: ModuleBody | JSDocNamespaceDeclaration;
-    }
-    type NamespaceBody = ModuleBlock | NamespaceDeclaration;
-    interface NamespaceDeclaration extends ModuleDeclaration {
-        name: Identifier;
-        body: NamespaceBody;
-    }
-    type JSDocNamespaceBody = Identifier | JSDocNamespaceDeclaration;
-    interface JSDocNamespaceDeclaration extends ModuleDeclaration {
-        name: Identifier;
-        body?: JSDocNamespaceBody;
-    }
-    interface ModuleBlock extends Node, Statement {
-        kind: SyntaxKind.ModuleBlock;
-        parent: ModuleDeclaration;
-        statements: NodeArray<Statement>;
-    }
-    type ModuleReference = EntityName | ExternalModuleReference;
-    /**
-     * One of:
-     * - import x = require("mod");
-     * - import x = M.x;
-     */
-    interface ImportEqualsDeclaration extends DeclarationStatement, JSDocContainer {
-        kind: SyntaxKind.ImportEqualsDeclaration;
-        parent: SourceFile | ModuleBlock;
-        name: Identifier;
-        moduleReference: ModuleReference;
-    }
-    interface ExternalModuleReference extends Node {
-        kind: SyntaxKind.ExternalModuleReference;
-        parent: ImportEqualsDeclaration;
-        expression: Expression;
-    }
-    interface ImportDeclaration extends Statement {
-        kind: SyntaxKind.ImportDeclaration;
-        parent: SourceFile | ModuleBlock;
-        importClause?: ImportClause;
-        /** If this is not a StringLiteral it will be a grammar error. */
-        moduleSpecifier: Expression;
-    }
-    type NamedImportBindings = NamespaceImport | NamedImports;
-    interface ImportClause extends NamedDeclaration {
-        kind: SyntaxKind.ImportClause;
-        parent: ImportDeclaration;
-        name?: Identifier;
-        namedBindings?: NamedImportBindings;
-    }
-    interface NamespaceImport extends NamedDeclaration {
-        kind: SyntaxKind.NamespaceImport;
-        parent: ImportClause;
-        name: Identifier;
-    }
-    interface NamespaceExportDeclaration extends DeclarationStatement {
-        kind: SyntaxKind.NamespaceExportDeclaration;
-        name: Identifier;
-    }
-    interface ExportDeclaration extends DeclarationStatement {
-        kind: SyntaxKind.ExportDeclaration;
-        parent: SourceFile | ModuleBlock;
-        /** Will not be assigned in the case of `export * from "foo";` */
-        exportClause?: NamedExports;
-        /** If this is not a StringLiteral it will be a grammar error. */
-        moduleSpecifier?: Expression;
-    }
-    interface NamedImports extends Node {
-        kind: SyntaxKind.NamedImports;
-        parent: ImportClause;
-        elements: NodeArray<ImportSpecifier>;
-    }
-    interface NamedExports extends Node {
-        kind: SyntaxKind.NamedExports;
-        parent: ExportDeclaration;
-        elements: NodeArray<ExportSpecifier>;
-    }
-    type NamedImportsOrExports = NamedImports | NamedExports;
-    interface ImportSpecifier extends NamedDeclaration {
-        kind: SyntaxKind.ImportSpecifier;
-        parent: NamedImports;
-        propertyName?: Identifier;
-        name: Identifier;
-    }
-    interface ExportSpecifier extends NamedDeclaration {
-        kind: SyntaxKind.ExportSpecifier;
-        parent: NamedExports;
-        propertyName?: Identifier;
-        name: Identifier;
-    }
-    type ImportOrExportSpecifier = ImportSpecifier | ExportSpecifier;
-    /**
-     * This is either an `export =` or an `export default` declaration.
-     * Unless `isExportEquals` is set, this node was parsed as an `export default`.
-     */
-    interface ExportAssignment extends DeclarationStatement {
-        kind: SyntaxKind.ExportAssignment;
-        parent: SourceFile;
-        isExportEquals?: boolean;
-        expression: Expression;
-    }
-    interface FileReference extends TextRange {
-        fileName: string;
-    }
-    interface CheckJsDirective extends TextRange {
-        enabled: boolean;
-    }
-    type CommentKind = SyntaxKind.SingleLineCommentTrivia | SyntaxKind.MultiLineCommentTrivia;
-    interface CommentRange extends TextRange {
-        hasTrailingNewLine?: boolean;
-        kind: CommentKind;
-    }
-    interface SynthesizedComment extends CommentRange {
-        text: string;
-        pos: -1;
-        end: -1;
-    }
-    interface JSDocTypeExpression extends TypeNode {
-        kind: SyntaxKind.JSDocTypeExpression;
-        type: TypeNode;
-    }
-    interface JSDocType extends TypeNode {
-        _jsDocTypeBrand: any;
-    }
-    interface JSDocAllType extends JSDocType {
-        kind: SyntaxKind.JSDocAllType;
-    }
-    interface JSDocUnknownType extends JSDocType {
-        kind: SyntaxKind.JSDocUnknownType;
-    }
-    interface JSDocNonNullableType extends JSDocType {
-        kind: SyntaxKind.JSDocNonNullableType;
-        type: TypeNode;
-    }
-    interface JSDocNullableType extends JSDocType {
-        kind: SyntaxKind.JSDocNullableType;
-        type: TypeNode;
-    }
-    interface JSDocOptionalType extends JSDocType {
-        kind: SyntaxKind.JSDocOptionalType;
-        type: TypeNode;
-    }
-    interface JSDocFunctionType extends JSDocType, SignatureDeclarationBase {
-        kind: SyntaxKind.JSDocFunctionType;
-    }
-    interface JSDocVariadicType extends JSDocType {
-        kind: SyntaxKind.JSDocVariadicType;
-        type: TypeNode;
-    }
-    type JSDocTypeReferencingNode = JSDocVariadicType | JSDocOptionalType | JSDocNullableType | JSDocNonNullableType;
-    interface JSDoc extends Node {
-        kind: SyntaxKind.JSDocComment;
-        parent: HasJSDoc;
-        tags?: NodeArray<JSDocTag>;
-        comment?: string;
-    }
-    interface JSDocTag extends Node {
-        parent: JSDoc | JSDocTypeLiteral;
-        atToken: AtToken;
-        tagName: Identifier;
-        comment?: string;
-    }
-    interface JSDocUnknownTag extends JSDocTag {
-        kind: SyntaxKind.JSDocTag;
-    }
-    /**
-     * Note that `@extends` is a synonym of `@augments`.
-     * Both tags are represented by this interface.
-     */
-    interface JSDocAugmentsTag extends JSDocTag {
-        kind: SyntaxKind.JSDocAugmentsTag;
-        class: ExpressionWithTypeArguments & {
-            expression: Identifier | PropertyAccessEntityNameExpression;
-        };
-    }
-    interface JSDocClassTag extends JSDocTag {
-        kind: SyntaxKind.JSDocClassTag;
-    }
-    interface JSDocTemplateTag extends JSDocTag {
-        kind: SyntaxKind.JSDocTemplateTag;
-        typeParameters: NodeArray<TypeParameterDeclaration>;
-    }
-    interface JSDocReturnTag extends JSDocTag {
-        kind: SyntaxKind.JSDocReturnTag;
-        typeExpression?: JSDocTypeExpression;
-    }
-    interface JSDocTypeTag extends JSDocTag {
-        kind: SyntaxKind.JSDocTypeTag;
-        typeExpression?: JSDocTypeExpression;
-    }
-    interface JSDocTypedefTag extends JSDocTag, NamedDeclaration {
-        parent: JSDoc;
-        kind: SyntaxKind.JSDocTypedefTag;
-        fullName?: JSDocNamespaceDeclaration | Identifier;
-        name?: Identifier;
-        typeExpression?: JSDocTypeExpression | JSDocTypeLiteral;
-    }
-    interface JSDocCallbackTag extends JSDocTag, NamedDeclaration {
-        parent: JSDoc;
-        kind: SyntaxKind.JSDocCallbackTag;
-        fullName?: JSDocNamespaceDeclaration | Identifier;
-        name?: Identifier;
-        typeExpression: JSDocSignature;
-    }
-    interface JSDocSignature extends JSDocType, Declaration {
-        kind: SyntaxKind.JSDocSignature;
-        typeParameters?: ReadonlyArray<JSDocTemplateTag>;
-        parameters: ReadonlyArray<JSDocParameterTag>;
-        type: JSDocReturnTag | undefined;
-    }
-    interface JSDocPropertyLikeTag extends JSDocTag, Declaration {
-        parent: JSDoc;
-        name: EntityName;
-        typeExpression?: JSDocTypeExpression;
-        /** Whether the property name came before the type -- non-standard for JSDoc, but Typescript-like */
-        isNameFirst: boolean;
-        isBracketed: boolean;
-    }
-    interface JSDocPropertyTag extends JSDocPropertyLikeTag {
-        kind: SyntaxKind.JSDocPropertyTag;
-    }
-    interface JSDocParameterTag extends JSDocPropertyLikeTag {
-        kind: SyntaxKind.JSDocParameterTag;
-    }
-    interface JSDocTypeLiteral extends JSDocType {
-        kind: SyntaxKind.JSDocTypeLiteral;
-        jsDocPropertyTags?: ReadonlyArray<JSDocPropertyLikeTag>;
-        /** If true, then this type literal represents an *array* of its type. */
-        isArrayType?: boolean;
-    }
-    enum FlowFlags {
-        Unreachable = 1,
-        Start = 2,
-        BranchLabel = 4,
-        LoopLabel = 8,
-        Assignment = 16,
-        TrueCondition = 32,
-        FalseCondition = 64,
-        SwitchClause = 128,
-        ArrayMutation = 256,
-        Referenced = 512,
-        Shared = 1024,
-        PreFinally = 2048,
-        AfterFinally = 4096,
-        Label = 12,
-        Condition = 96
-    }
-    interface FlowLock {
-        locked?: boolean;
-    }
-    interface AfterFinallyFlow extends FlowNodeBase, FlowLock {
-        antecedent: FlowNode;
-    }
-    interface PreFinallyFlow extends FlowNodeBase {
-        antecedent: FlowNode;
-        lock: FlowLock;
-    }
-    type FlowNode = AfterFinallyFlow | PreFinallyFlow | FlowStart | FlowLabel | FlowAssignment | FlowCondition | FlowSwitchClause | FlowArrayMutation;
-    interface FlowNodeBase {
-        flags: FlowFlags;
-        id?: number;
-    }
-    interface FlowStart extends FlowNodeBase {
-        container?: FunctionExpression | ArrowFunction | MethodDeclaration;
-    }
-    interface FlowLabel extends FlowNodeBase {
-        antecedents: FlowNode[] | undefined;
-    }
-    interface FlowAssignment extends FlowNodeBase {
-        node: Expression | VariableDeclaration | BindingElement;
-        antecedent: FlowNode;
-    }
-    interface FlowCondition extends FlowNodeBase {
-        expression: Expression;
-        antecedent: FlowNode;
-    }
-    interface FlowSwitchClause extends FlowNodeBase {
-        switchStatement: SwitchStatement;
-        clauseStart: number;
-        clauseEnd: number;
-        antecedent: FlowNode;
-    }
-    interface FlowArrayMutation extends FlowNodeBase {
-        node: CallExpression | BinaryExpression;
-        antecedent: FlowNode;
-    }
-    type FlowType = Type | IncompleteType;
-    interface IncompleteType {
-        flags: TypeFlags;
-        type: Type;
-    }
-    interface AmdDependency {
-        path: string;
-        name?: string;
-    }
-    interface SourceFile extends Declaration {
-        kind: SyntaxKind.SourceFile;
-        statements: NodeArray<Statement>;
-        endOfFileToken: Token<SyntaxKind.EndOfFileToken>;
-        fileName: string;
-        text: string;
-        amdDependencies: ReadonlyArray<AmdDependency>;
-        moduleName?: string;
-        referencedFiles: ReadonlyArray<FileReference>;
-        typeReferenceDirectives: ReadonlyArray<FileReference>;
-        libReferenceDirectives: ReadonlyArray<FileReference>;
-        languageVariant: LanguageVariant;
-        isDeclarationFile: boolean;
-        /**
-         * lib.d.ts should have a reference comment like
-         *
-         *  /// <reference no-default-lib="true"/>
-         *
-         * If any other file has this comment, it signals not to include lib.d.ts
-         * because this containing file is intended to act as a default library.
-         */
-        hasNoDefaultLib: boolean;
-        languageVersion: ScriptTarget;
-    }
-    interface Bundle extends Node {
-        kind: SyntaxKind.Bundle;
-        prepends: ReadonlyArray<InputFiles | UnparsedSource>;
-        sourceFiles: ReadonlyArray<SourceFile>;
-    }
-    interface InputFiles extends Node {
-        kind: SyntaxKind.InputFiles;
-        javascriptText: string;
-        javascriptMapText?: string;
-        declarationText: string;
-        declarationMapText?: string;
-    }
-    interface UnparsedSource extends Node {
-        kind: SyntaxKind.UnparsedSource;
-        text: string;
-        sourceMapText?: string;
-    }
-    interface JsonSourceFile extends SourceFile {
-        statements: NodeArray<JsonObjectExpressionStatement>;
-    }
-    interface TsConfigSourceFile extends JsonSourceFile {
-        extendedSourceFiles?: string[];
-    }
-    interface JsonMinusNumericLiteral extends PrefixUnaryExpression {
-        kind: SyntaxKind.PrefixUnaryExpression;
-        operator: SyntaxKind.MinusToken;
-        operand: NumericLiteral;
-    }
-    interface JsonObjectExpressionStatement extends ExpressionStatement {
-        expression: ObjectLiteralExpression | ArrayLiteralExpression | JsonMinusNumericLiteral | NumericLiteral | StringLiteral | BooleanLiteral | NullLiteral;
-    }
-    interface ScriptReferenceHost {
-        getCompilerOptions(): CompilerOptions;
-        getSourceFile(fileName: string): SourceFile | undefined;
-        getSourceFileByPath(path: Path): SourceFile | undefined;
-        getCurrentDirectory(): string;
-    }
-    interface ParseConfigHost {
-        useCaseSensitiveFileNames: boolean;
-        readDirectory(rootDir: string, extensions: ReadonlyArray<string>, excludes: ReadonlyArray<string> | undefined, includes: ReadonlyArray<string>, depth?: number): string[];
-        /**
-         * Gets a value indicating whether the specified path exists and is a file.
-         * @param path The path to test.
-         */
-        fileExists(path: string): boolean;
-        readFile(path: string): string | undefined;
-    }
-    type WriteFileCallback = (fileName: string, data: string, writeByteOrderMark: boolean, onError: ((message: string) => void) | undefined, sourceFiles?: ReadonlyArray<SourceFile>) => void;
-    class OperationCanceledException {
-    }
-    interface CancellationToken {
-        isCancellationRequested(): boolean;
-        /** @throws OperationCanceledException if isCancellationRequested is true */
-        throwIfCancellationRequested(): void;
-    }
-    interface Program extends ScriptReferenceHost {
-        /**
-         * Get a list of root file names that were passed to a 'createProgram'
-         */
-        getRootFileNames(): ReadonlyArray<string>;
-        /**
-         * Get a list of files in the program
-         */
-        getSourceFiles(): ReadonlyArray<SourceFile>;
-        /**
-         * Emits the JavaScript and declaration files.  If targetSourceFile is not specified, then
-         * the JavaScript and declaration files will be produced for all the files in this program.
-         * If targetSourceFile is specified, then only the JavaScript and declaration for that
-         * specific file will be generated.
-         *
-         * If writeFile is not specified then the writeFile callback from the compiler host will be
-         * used for writing the JavaScript and declaration files.  Otherwise, the writeFile parameter
-         * will be invoked when writing the JavaScript and declaration files.
-         */
-        emit(targetSourceFile?: SourceFile, writeFile?: WriteFileCallback, cancellationToken?: CancellationToken, emitOnlyDtsFiles?: boolean, customTransformers?: CustomTransformers): EmitResult;
-        getOptionsDiagnostics(cancellationToken?: CancellationToken): ReadonlyArray<Diagnostic>;
-        getGlobalDiagnostics(cancellationToken?: CancellationToken): ReadonlyArray<Diagnostic>;
-        getSyntacticDiagnostics(sourceFile?: SourceFile, cancellationToken?: CancellationToken): ReadonlyArray<DiagnosticWithLocation>;
-        /** The first time this is called, it will return global diagnostics (no location). */
-        getSemanticDiagnostics(sourceFile?: SourceFile, cancellationToken?: CancellationToken): ReadonlyArray<Diagnostic>;
-        getDeclarationDiagnostics(sourceFile?: SourceFile, cancellationToken?: CancellationToken): ReadonlyArray<DiagnosticWithLocation>;
-        getConfigFileParsingDiagnostics(): ReadonlyArray<Diagnostic>;
-        /**
-         * Gets a type checker that can be used to semantically analyze source files in the program.
-         */
-        getTypeChecker(): TypeChecker;
-        isSourceFileFromExternalLibrary(file: SourceFile): boolean;
-        getProjectReferences(): (ResolvedProjectReference | undefined)[] | undefined;
-    }
-    interface ResolvedProjectReference {
-        commandLine: ParsedCommandLine;
-        sourceFile: SourceFile;
-    }
-    interface CustomTransformers {
-        /** Custom transformers to evaluate before built-in .js transformations. */
-        before?: TransformerFactory<SourceFile>[];
-        /** Custom transformers to evaluate after built-in .js transformations. */
-        after?: TransformerFactory<SourceFile>[];
-        /** Custom transformers to evaluate after built-in .d.ts transformations. */
-        afterDeclarations?: TransformerFactory<Bundle | SourceFile>[];
-    }
-    interface SourceMapSpan {
-        /** Line number in the .js file. */
-        emittedLine: number;
-        /** Column number in the .js file. */
-        emittedColumn: number;
-        /** Line number in the .ts file. */
-        sourceLine: number;
-        /** Column number in the .ts file. */
-        sourceColumn: number;
-        /** Optional name (index into names array) associated with this span. */
-        nameIndex?: number;
-        /** .ts file (index into sources array) associated with this span */
-        sourceIndex: number;
-    }
-    interface SourceMapData {
-        sourceMapFilePath: string;
-        jsSourceMappingURL: string;
-        sourceMapFile: string;
-        sourceMapSourceRoot: string;
-        sourceMapSources: string[];
-        sourceMapSourcesContent?: string[];
-        inputSourceFileNames: string[];
-        sourceMapNames?: string[];
-        sourceMapMappings: string;
-        sourceMapDecodedMappings: SourceMapSpan[];
-    }
-    /** Return code used by getEmitOutput function to indicate status of the function */
-    enum ExitStatus {
-        Success = 0,
-        DiagnosticsPresent_OutputsSkipped = 1,
-        DiagnosticsPresent_OutputsGenerated = 2
-    }
-    interface EmitResult {
-        emitSkipped: boolean;
-        /** Contains declaration emit diagnostics */
-        diagnostics: ReadonlyArray<Diagnostic>;
-        emittedFiles?: string[];
-    }
-    interface TypeChecker {
-        getTypeOfSymbolAtLocation(symbol: Symbol, node: Node): Type;
-        getDeclaredTypeOfSymbol(symbol: Symbol): Type;
-        getPropertiesOfType(type: Type): Symbol[];
-        getPropertyOfType(type: Type, propertyName: string): Symbol | undefined;
-        getIndexInfoOfType(type: Type, kind: IndexKind): IndexInfo | undefined;
-        getSignaturesOfType(type: Type, kind: SignatureKind): Signature[];
-        getIndexTypeOfType(type: Type, kind: IndexKind): Type | undefined;
-        getBaseTypes(type: InterfaceType): BaseType[];
-        getBaseTypeOfLiteralType(type: Type): Type;
-        getWidenedType(type: Type): Type;
-        getReturnTypeOfSignature(signature: Signature): Type;
-        getNullableType(type: Type, flags: TypeFlags): Type;
-        getNonNullableType(type: Type): Type;
-        /** Note that the resulting nodes cannot be checked. */
-        typeToTypeNode(type: Type, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): TypeNode | undefined;
-        /** Note that the resulting nodes cannot be checked. */
-        signatureToSignatureDeclaration(signature: Signature, kind: SyntaxKind, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): (SignatureDeclaration & {
-            typeArguments?: NodeArray<TypeNode>;
-        }) | undefined;
-        /** Note that the resulting nodes cannot be checked. */
-        indexInfoToIndexSignatureDeclaration(indexInfo: IndexInfo, kind: IndexKind, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): IndexSignatureDeclaration | undefined;
-        /** Note that the resulting nodes cannot be checked. */
-        symbolToEntityName(symbol: Symbol, meaning: SymbolFlags, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): EntityName | undefined;
-        /** Note that the resulting nodes cannot be checked. */
-        symbolToExpression(symbol: Symbol, meaning: SymbolFlags, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): Expression | undefined;
-        /** Note that the resulting nodes cannot be checked. */
-        symbolToTypeParameterDeclarations(symbol: Symbol, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): NodeArray<TypeParameterDeclaration> | undefined;
-        /** Note that the resulting nodes cannot be checked. */
-        symbolToParameterDeclaration(symbol: Symbol, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): ParameterDeclaration | undefined;
-        /** Note that the resulting nodes cannot be checked. */
-        typeParameterToDeclaration(parameter: TypeParameter, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): TypeParameterDeclaration | undefined;
-        getSymbolsInScope(location: Node, meaning: SymbolFlags): Symbol[];
-        getSymbolAtLocation(node: Node): Symbol | undefined;
-        getSymbolsOfParameterPropertyDeclaration(parameter: ParameterDeclaration, parameterName: string): Symbol[];
-        /**
-         * The function returns the value (local variable) symbol of an identifier in the short-hand property assignment.
-         * This is necessary as an identifier in short-hand property assignment can contains two meaning: property name and property value.
-         */
-        getShorthandAssignmentValueSymbol(location: Node): Symbol | undefined;
-        getExportSpecifierLocalTargetSymbol(location: ExportSpecifier): Symbol | undefined;
-        /**
-         * If a symbol is a local symbol with an associated exported symbol, returns the exported symbol.
-         * Otherwise returns its input.
-         * For example, at `export type T = number;`:
-         *     - `getSymbolAtLocation` at the location `T` will return the exported symbol for `T`.
-         *     - But the result of `getSymbolsInScope` will contain the *local* symbol for `T`, not the exported symbol.
-         *     - Calling `getExportSymbolOfSymbol` on that local symbol will return the exported symbol.
-         */
-        getExportSymbolOfSymbol(symbol: Symbol): Symbol;
-        getPropertySymbolOfDestructuringAssignment(location: Identifier): Symbol | undefined;
-        getTypeAtLocation(node: Node): Type | undefined;
-        getTypeFromTypeNode(node: TypeNode): Type;
-        signatureToString(signature: Signature, enclosingDeclaration?: Node, flags?: TypeFormatFlags, kind?: SignatureKind): string;
-        typeToString(type: Type, enclosingDeclaration?: Node, flags?: TypeFormatFlags): string;
-        symbolToString(symbol: Symbol, enclosingDeclaration?: Node, meaning?: SymbolFlags, flags?: SymbolFormatFlags): string;
-        typePredicateToString(predicate: TypePredicate, enclosingDeclaration?: Node, flags?: TypeFormatFlags): string;
-        /**
-         * @deprecated Use the createX factory functions or XToY typechecker methods and `createPrinter` or the `xToString` methods instead
-         * This will be removed in a future version.
-         */
-        getSymbolDisplayBuilder(): SymbolDisplayBuilder;
-        getFullyQualifiedName(symbol: Symbol): string;
-        getAugmentedPropertiesOfType(type: Type): Symbol[];
-        getRootSymbols(symbol: Symbol): Symbol[];
-        getContextualType(node: Expression): Type | undefined;
-        /**
-         * returns unknownSignature in the case of an error.
-         * returns undefined if the node is not valid.
-         * @param argumentCount Apparent number of arguments, passed in case of a possibly incomplete call. This should come from an ArgumentListInfo. See `signatureHelp.ts`.
-         */
-        getResolvedSignature(node: CallLikeExpression, candidatesOutArray?: Signature[], argumentCount?: number): Signature | undefined;
-        getSignatureFromDeclaration(declaration: SignatureDeclaration): Signature | undefined;
-        isImplementationOfOverload(node: SignatureDeclaration): boolean | undefined;
-        isUndefinedSymbol(symbol: Symbol): boolean;
-        isArgumentsSymbol(symbol: Symbol): boolean;
-        isUnknownSymbol(symbol: Symbol): boolean;
-        getConstantValue(node: EnumMember | PropertyAccessExpression | ElementAccessExpression): string | number | undefined;
-        isValidPropertyAccess(node: PropertyAccessExpression | QualifiedName | ImportTypeNode, propertyName: string): boolean;
-        /** Follow all aliases to get the original symbol. */
-        getAliasedSymbol(symbol: Symbol): Symbol;
-        getExportsOfModule(moduleSymbol: Symbol): Symbol[];
-        getAllAttributesTypeFromJsxOpeningLikeElement(elementNode: JsxOpeningLikeElement): Type | undefined;
-        getJsxIntrinsicTagNamesAt(location: Node): Symbol[];
-        isOptionalParameter(node: ParameterDeclaration): boolean;
-        getAmbientModules(): Symbol[];
-        tryGetMemberInModuleExports(memberName: string, moduleSymbol: Symbol): Symbol | undefined;
-        getApparentType(type: Type): Type;
-        getSuggestionForNonexistentProperty(node: Identifier, containingType: Type): string | undefined;
-        getSuggestionForNonexistentSymbol(location: Node, name: string, meaning: SymbolFlags): string | undefined;
-        getSuggestionForNonexistentModule(node: Identifier, target: Symbol): string | undefined;
-        getBaseConstraintOfType(type: Type): Type | undefined;
-        getDefaultFromTypeParameter(type: Type): Type | undefined;
-        /**
-         * Depending on the operation performed, it may be appropriate to throw away the checker
-         * if the cancellation token is triggered. Typically, if it is used for error checking
-         * and the operation is cancelled, then it should be discarded, otherwise it is safe to keep.
-         */
-        runWithCancellationToken<T>(token: CancellationToken, cb: (checker: TypeChecker) => T): T;
-    }
-    enum NodeBuilderFlags {
-        None = 0,
-        NoTruncation = 1,
-        WriteArrayAsGenericType = 2,
-        GenerateNamesForShadowedTypeParams = 4,
-        UseStructuralFallback = 8,
-        ForbidIndexedAccessSymbolReferences = 16,
-        WriteTypeArgumentsOfSignature = 32,
-        UseFullyQualifiedType = 64,
-        UseOnlyExternalAliasing = 128,
-        SuppressAnyReturnType = 256,
-        WriteTypeParametersInQualifiedName = 512,
-        MultilineObjectLiterals = 1024,
-        WriteClassExpressionAsTypeLiteral = 2048,
-        UseTypeOfFunction = 4096,
-        OmitParameterModifiers = 8192,
-        UseAliasDefinedOutsideCurrentScope = 16384,
-        AllowThisInObjectLiteral = 32768,
-        AllowQualifedNameInPlaceOfIdentifier = 65536,
-        AllowAnonymousIdentifier = 131072,
-        AllowEmptyUnionOrIntersection = 262144,
-        AllowEmptyTuple = 524288,
-        AllowUniqueESSymbolType = 1048576,
-        AllowEmptyIndexInfoType = 2097152,
-        IgnoreErrors = 3112960,
-        InObjectTypeLiteral = 4194304,
-        InTypeAlias = 8388608,
-        InInitialEntityName = 16777216,
-        InReverseMappedType = 33554432
-    }
-    enum TypeFormatFlags {
-        None = 0,
-        NoTruncation = 1,
-        WriteArrayAsGenericType = 2,
-        UseStructuralFallback = 8,
-        WriteTypeArgumentsOfSignature = 32,
-        UseFullyQualifiedType = 64,
-        SuppressAnyReturnType = 256,
-        MultilineObjectLiterals = 1024,
-        WriteClassExpressionAsTypeLiteral = 2048,
-        UseTypeOfFunction = 4096,
-        OmitParameterModifiers = 8192,
-        UseAliasDefinedOutsideCurrentScope = 16384,
-        AllowUniqueESSymbolType = 1048576,
-        AddUndefined = 131072,
-        WriteArrowStyleSignature = 262144,
-        InArrayType = 524288,
-        InElementType = 2097152,
-        InFirstTypeArgument = 4194304,
-        InTypeAlias = 8388608,
-        /** @deprecated */ WriteOwnNameForAnyLike = 0,
-        NodeBuilderFlagsMask = 9469291
-    }
-    enum SymbolFormatFlags {
-        None = 0,
-        WriteTypeParametersOrArguments = 1,
-        UseOnlyExternalAliasing = 2,
-        AllowAnyNodeKind = 4,
-        UseAliasDefinedOutsideCurrentScope = 8
-    }
-    /**
-     * @deprecated
-     */
-    interface SymbolDisplayBuilder {
-        /** @deprecated */ buildTypeDisplay(type: Type, writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags): void;
-        /** @deprecated */ buildSymbolDisplay(symbol: Symbol, writer: SymbolWriter, enclosingDeclaration?: Node, meaning?: SymbolFlags, flags?: SymbolFormatFlags): void;
-        /** @deprecated */ buildSignatureDisplay(signature: Signature, writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags, kind?: SignatureKind): void;
-        /** @deprecated */ buildIndexSignatureDisplay(info: IndexInfo, writer: SymbolWriter, kind: IndexKind, enclosingDeclaration?: Node, globalFlags?: TypeFormatFlags, symbolStack?: Symbol[]): void;
-        /** @deprecated */ buildParameterDisplay(parameter: Symbol, writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags): void;
-        /** @deprecated */ buildTypeParameterDisplay(tp: TypeParameter, writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags): void;
-        /** @deprecated */ buildTypePredicateDisplay(predicate: TypePredicate, writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags): void;
-        /** @deprecated */ buildTypeParameterDisplayFromSymbol(symbol: Symbol, writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags): void;
-        /** @deprecated */ buildDisplayForParametersAndDelimiters(thisParameter: Symbol, parameters: Symbol[], writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags): void;
-        /** @deprecated */ buildDisplayForTypeParametersAndDelimiters(typeParameters: TypeParameter[], writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags): void;
-        /** @deprecated */ buildReturnTypeDisplay(signature: Signature, writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags): void;
-    }
-    /**
-     * @deprecated Migrate to other methods of generating symbol names, ex symbolToEntityName + a printer or symbolToString
-     */
-    interface SymbolWriter extends SymbolTracker {
-        writeKeyword(text: string): void;
-        writeOperator(text: string): void;
-        writePunctuation(text: string): void;
-        writeSpace(text: string): void;
-        writeStringLiteral(text: string): void;
-        writeParameter(text: string): void;
-        writeProperty(text: string): void;
-        writeSymbol(text: string, symbol: Symbol): void;
-        writeLine(): void;
-        increaseIndent(): void;
-        decreaseIndent(): void;
-        clear(): void;
-    }
-    enum TypePredicateKind {
-        This = 0,
-        Identifier = 1
-    }
-    interface TypePredicateBase {
-        kind: TypePredicateKind;
-        type: Type;
-    }
-    interface ThisTypePredicate extends TypePredicateBase {
-        kind: TypePredicateKind.This;
-    }
-    interface IdentifierTypePredicate extends TypePredicateBase {
-        kind: TypePredicateKind.Identifier;
-        parameterName: string;
-        parameterIndex: number;
-    }
-    type TypePredicate = IdentifierTypePredicate | ThisTypePredicate;
-    enum SymbolFlags {
-        None = 0,
-        FunctionScopedVariable = 1,
-        BlockScopedVariable = 2,
-        Property = 4,
-        EnumMember = 8,
-        Function = 16,
-        Class = 32,
-        Interface = 64,
-        ConstEnum = 128,
-        RegularEnum = 256,
-        ValueModule = 512,
-        NamespaceModule = 1024,
-        TypeLiteral = 2048,
-        ObjectLiteral = 4096,
-        Method = 8192,
-        Constructor = 16384,
-        GetAccessor = 32768,
-        SetAccessor = 65536,
-        Signature = 131072,
-        TypeParameter = 262144,
-        TypeAlias = 524288,
-        ExportValue = 1048576,
-        Alias = 2097152,
-        Prototype = 4194304,
-        ExportStar = 8388608,
-        Optional = 16777216,
-        Transient = 33554432,
-        JSContainer = 67108864,
-        Enum = 384,
-        Variable = 3,
-        Value = 67216319,
-        Type = 67901928,
-        Namespace = 1920,
-        Module = 1536,
-        Accessor = 98304,
-        FunctionScopedVariableExcludes = 67216318,
-        BlockScopedVariableExcludes = 67216319,
-        ParameterExcludes = 67216319,
-        PropertyExcludes = 0,
-        EnumMemberExcludes = 68008959,
-        FunctionExcludes = 67215791,
-        ClassExcludes = 68008383,
-        InterfaceExcludes = 67901832,
-        RegularEnumExcludes = 68008191,
-        ConstEnumExcludes = 68008831,
-        ValueModuleExcludes = 67215503,
-        NamespaceModuleExcludes = 0,
-        MethodExcludes = 67208127,
-        GetAccessorExcludes = 67150783,
-        SetAccessorExcludes = 67183551,
-        TypeParameterExcludes = 67639784,
-        TypeAliasExcludes = 67901928,
-        AliasExcludes = 2097152,
-        ModuleMember = 2623475,
-        ExportHasLocal = 944,
-        HasExports = 1952,
-        HasMembers = 6240,
-        BlockScoped = 418,
-        PropertyOrAccessor = 98308,
-        ClassMember = 106500
-    }
-    interface Symbol {
-        flags: SymbolFlags;
-        escapedName: __String;
-        declarations: Declaration[];
-        valueDeclaration: Declaration;
-        members?: SymbolTable;
-        exports?: SymbolTable;
-        globalExports?: SymbolTable;
-    }
-    enum InternalSymbolName {
-        Call = "__call",
-        Constructor = "__constructor",
-        New = "__new",
-        Index = "__index",
-        ExportStar = "__export",
-        Global = "__global",
-        Missing = "__missing",
-        Type = "__type",
-        Object = "__object",
-        JSXAttributes = "__jsxAttributes",
-        Class = "__class",
-        Function = "__function",
-        Computed = "__computed",
-        Resolving = "__resolving__",
-        ExportEquals = "export=",
-        Default = "default"
-    }
-    /**
-     * This represents a string whose leading underscore have been escaped by adding extra leading underscores.
-     * The shape of this brand is rather unique compared to others we've used.
-     * Instead of just an intersection of a string and an object, it is that union-ed
-     * with an intersection of void and an object. This makes it wholly incompatible
-     * with a normal string (which is good, it cannot be misused on assignment or on usage),
-     * while still being comparable with a normal string via === (also good) and castable from a string.
-     */
-    type __String = (string & {
-        __escapedIdentifier: void;
-    }) | (void & {
-        __escapedIdentifier: void;
-    }) | InternalSymbolName;
-    /** ReadonlyMap where keys are `__String`s. */
-    interface ReadonlyUnderscoreEscapedMap<T> {
-        get(key: __String): T | undefined;
-        has(key: __String): boolean;
-        forEach(action: (value: T, key: __String) => void): void;
-        readonly size: number;
-        keys(): Iterator<__String>;
-        values(): Iterator<T>;
-        entries(): Iterator<[__String, T]>;
-    }
-    /** Map where keys are `__String`s. */
-    interface UnderscoreEscapedMap<T> extends ReadonlyUnderscoreEscapedMap<T> {
-        set(key: __String, value: T): this;
-        delete(key: __String): boolean;
-        clear(): void;
-    }
-    /** SymbolTable based on ES6 Map interface. */
-    type SymbolTable = UnderscoreEscapedMap<Symbol>;
-    enum TypeFlags {
-        Any = 1,
-        Unknown = 2,
-        String = 4,
-        Number = 8,
-        Boolean = 16,
-        Enum = 32,
-        StringLiteral = 64,
-        NumberLiteral = 128,
-        BooleanLiteral = 256,
-        EnumLiteral = 512,
-        ESSymbol = 1024,
-        UniqueESSymbol = 2048,
-        Void = 4096,
-        Undefined = 8192,
-        Null = 16384,
-        Never = 32768,
-        TypeParameter = 65536,
-        Object = 131072,
-        Union = 262144,
-        Intersection = 524288,
-        Index = 1048576,
-        IndexedAccess = 2097152,
-        Conditional = 4194304,
-        Substitution = 8388608,
-        NonPrimitive = 16777216,
-        Literal = 448,
-        Unit = 27072,
-        StringOrNumberLiteral = 192,
-        PossiblyFalsy = 29148,
-        StringLike = 68,
-        NumberLike = 168,
-        BooleanLike = 272,
-        EnumLike = 544,
-        ESSymbolLike = 3072,
-        VoidLike = 12288,
-        UnionOrIntersection = 786432,
-        StructuredType = 917504,
-        TypeVariable = 2162688,
-        InstantiableNonPrimitive = 14745600,
-        InstantiablePrimitive = 1048576,
-        Instantiable = 15794176,
-        StructuredOrInstantiable = 16711680,
-        Narrowable = 33492479,
-        NotUnionOrUnit = 16909315
-    }
-    type DestructuringPattern = BindingPattern | ObjectLiteralExpression | ArrayLiteralExpression;
-    interface Type {
-        flags: TypeFlags;
-        symbol: Symbol;
-        pattern?: DestructuringPattern;
-        aliasSymbol?: Symbol;
-        aliasTypeArguments?: Type[];
-    }
-    interface LiteralType extends Type {
-        value: string | number;
-        freshType: LiteralType;
-        regularType: LiteralType;
-    }
-    interface UniqueESSymbolType extends Type {
-        symbol: Symbol;
-    }
-    interface StringLiteralType extends LiteralType {
-        value: string;
-    }
-    interface NumberLiteralType extends LiteralType {
-        value: number;
-    }
-    interface EnumType extends Type {
-    }
-    enum ObjectFlags {
-        Class = 1,
-        Interface = 2,
-        Reference = 4,
-        Tuple = 8,
-        Anonymous = 16,
-        Mapped = 32,
-        Instantiated = 64,
-        ObjectLiteral = 128,
-        EvolvingArray = 256,
-        ObjectLiteralPatternWithComputedProperties = 512,
-        ContainsSpread = 1024,
-        ReverseMapped = 2048,
-        JsxAttributes = 4096,
-        MarkerType = 8192,
-        ClassOrInterface = 3
-    }
-    interface ObjectType extends Type {
-        objectFlags: ObjectFlags;
-    }
-    /** Class and interface types (ObjectFlags.Class and ObjectFlags.Interface). */
-    interface InterfaceType extends ObjectType {
-        typeParameters: TypeParameter[] | undefined;
-        outerTypeParameters: TypeParameter[] | undefined;
-        localTypeParameters: TypeParameter[] | undefined;
-        thisType: TypeParameter | undefined;
-    }
-    type BaseType = ObjectType | IntersectionType;
-    interface InterfaceTypeWithDeclaredMembers extends InterfaceType {
-        declaredProperties: Symbol[];
-        declaredCallSignatures: Signature[];
-        declaredConstructSignatures: Signature[];
-        declaredStringIndexInfo?: IndexInfo;
-        declaredNumberIndexInfo?: IndexInfo;
-    }
-    /**
-     * Type references (ObjectFlags.Reference). When a class or interface has type parameters or
-     * a "this" type, references to the class or interface are made using type references. The
-     * typeArguments property specifies the types to substitute for the type parameters of the
-     * class or interface and optionally includes an extra element that specifies the type to
-     * substitute for "this" in the resulting instantiation. When no extra argument is present,
-     * the type reference itself is substituted for "this". The typeArguments property is undefined
-     * if the class or interface has no type parameters and the reference isn't specifying an
-     * explicit "this" argument.
-     */
-    interface TypeReference extends ObjectType {
-        target: GenericType;
-        typeArguments?: Type[];
-    }
-    interface GenericType extends InterfaceType, TypeReference {
-    }
-    interface UnionOrIntersectionType extends Type {
-        types: Type[];
-    }
-    interface UnionType extends UnionOrIntersectionType {
-    }
-    interface IntersectionType extends UnionOrIntersectionType {
-    }
-    type StructuredType = ObjectType | UnionType | IntersectionType;
-    interface EvolvingArrayType extends ObjectType {
-        elementType: Type;
-        finalArrayType?: Type;
-    }
-    interface InstantiableType extends Type {
-    }
-    interface TypeParameter extends InstantiableType {
-    }
-    interface IndexedAccessType extends InstantiableType {
-        objectType: Type;
-        indexType: Type;
-        constraint?: Type;
-        simplified?: Type;
-    }
-    type TypeVariable = TypeParameter | IndexedAccessType;
-    interface IndexType extends InstantiableType {
-        type: InstantiableType | UnionOrIntersectionType;
-    }
-    interface ConditionalRoot {
-        node: ConditionalTypeNode;
-        checkType: Type;
-        extendsType: Type;
-        trueType: Type;
-        falseType: Type;
-        isDistributive: boolean;
-        inferTypeParameters?: TypeParameter[];
-        outerTypeParameters?: TypeParameter[];
-        instantiations?: Map<Type>;
-        aliasSymbol?: Symbol;
-        aliasTypeArguments?: Type[];
-    }
-    interface ConditionalType extends InstantiableType {
-        root: ConditionalRoot;
-        checkType: Type;
-        extendsType: Type;
-        resolvedTrueType?: Type;
-        resolvedFalseType?: Type;
-    }
-    interface SubstitutionType extends InstantiableType {
-        typeVariable: TypeVariable;
-        substitute: Type;
-    }
-    enum SignatureKind {
-        Call = 0,
-        Construct = 1
-    }
-    interface Signature {
-        declaration?: SignatureDeclaration | JSDocSignature;
-        typeParameters?: TypeParameter[];
-        parameters: Symbol[];
-    }
-    enum IndexKind {
-        String = 0,
-        Number = 1
-    }
-    interface IndexInfo {
-        type: Type;
-        isReadonly: boolean;
-        declaration?: IndexSignatureDeclaration;
-    }
-    enum InferencePriority {
-        NakedTypeVariable = 1,
-        HomomorphicMappedType = 2,
-        MappedTypeConstraint = 4,
-        ReturnType = 8,
-        LiteralKeyof = 16,
-        NoConstraints = 32,
-        AlwaysStrict = 64,
-        PriorityImpliesCombination = 28
-    }
-    /** @deprecated Use FileExtensionInfo instead. */
-    type JsFileExtensionInfo = FileExtensionInfo;
-    interface FileExtensionInfo {
-        extension: string;
-        isMixedContent: boolean;
-        scriptKind?: ScriptKind;
-    }
-    interface DiagnosticMessage {
-        key: string;
-        category: DiagnosticCategory;
-        code: number;
-        message: string;
-        reportsUnnecessary?: {};
-    }
-    /**
-     * A linked list of formatted diagnostic messages to be used as part of a multiline message.
-     * It is built from the bottom up, leaving the head to be the "main" diagnostic.
-     * While it seems that DiagnosticMessageChain is structurally similar to DiagnosticMessage,
-     * the difference is that messages are all preformatted in DMC.
-     */
-    interface DiagnosticMessageChain {
-        messageText: string;
-        category: DiagnosticCategory;
-        code: number;
-        next?: DiagnosticMessageChain;
-    }
-    interface Diagnostic {
-        file: SourceFile | undefined;
-        start: number | undefined;
-        length: number | undefined;
-        messageText: string | DiagnosticMessageChain;
-        category: DiagnosticCategory;
-        /** May store more in future. For now, this will simply be `true` to indicate when a diagnostic is an unused-identifier diagnostic. */
-        reportsUnnecessary?: {};
-        code: number;
-        source?: string;
-    }
-    interface DiagnosticWithLocation extends Diagnostic {
-        file: SourceFile;
-        start: number;
-        length: number;
-    }
-    enum DiagnosticCategory {
-        Warning = 0,
-        Error = 1,
-        Suggestion = 2,
-        Message = 3
-    }
-    enum ModuleResolutionKind {
-        Classic = 1,
-        NodeJs = 2
-    }
-    interface PluginImport {
-        name: string;
-    }
-    interface ProjectReference {
-        /** A normalized path on disk */
-        path: string;
-        /** The path as the user originally wrote it */
-        originalPath?: string;
-        /** True if the output of this reference should be prepended to the output of this project. Only valid for --outFile compilations */
-        prepend?: boolean;
-        /** True if it is intended that this reference form a circularity */
-        circular?: boolean;
-    }
-    type CompilerOptionsValue = string | number | boolean | (string | number)[] | string[] | MapLike<string[]> | PluginImport[] | ProjectReference[] | null | undefined;
-    interface CompilerOptions {
-        allowJs?: boolean;
-        allowSyntheticDefaultImports?: boolean;
-        allowUnreachableCode?: boolean;
-        allowUnusedLabels?: boolean;
-        alwaysStrict?: boolean;
-        baseUrl?: string;
-        charset?: string;
-        checkJs?: boolean;
-        declaration?: boolean;
-        declarationMap?: boolean;
-        emitDeclarationOnly?: boolean;
-        declarationDir?: string;
-        disableSizeLimit?: boolean;
-        downlevelIteration?: boolean;
-        emitBOM?: boolean;
-        emitDecoratorMetadata?: boolean;
-        experimentalDecorators?: boolean;
-        forceConsistentCasingInFileNames?: boolean;
-        importHelpers?: boolean;
-        inlineSourceMap?: boolean;
-        inlineSources?: boolean;
-        isolatedModules?: boolean;
-        jsx?: JsxEmit;
-        keyofStringsOnly?: boolean;
-        lib?: string[];
-        locale?: string;
-        mapRoot?: string;
-        maxNodeModuleJsDepth?: number;
-        module?: ModuleKind;
-        moduleResolution?: ModuleResolutionKind;
-        newLine?: NewLineKind;
-        noEmit?: boolean;
-        noEmitHelpers?: boolean;
-        noEmitOnError?: boolean;
-        noErrorTruncation?: boolean;
-        noFallthroughCasesInSwitch?: boolean;
-        noImplicitAny?: boolean;
-        noImplicitReturns?: boolean;
-        noImplicitThis?: boolean;
-        noStrictGenericChecks?: boolean;
-        noUnusedLocals?: boolean;
-        noUnusedParameters?: boolean;
-        noImplicitUseStrict?: boolean;
-        noLib?: boolean;
-        noResolve?: boolean;
-        out?: string;
-        outDir?: string;
-        outFile?: string;
-        paths?: MapLike<string[]>;
-        preserveConstEnums?: boolean;
-        preserveSymlinks?: boolean;
-        project?: string;
-        reactNamespace?: string;
-        jsxFactory?: string;
-        composite?: boolean;
-        removeComments?: boolean;
-        rootDir?: string;
-        rootDirs?: string[];
-        skipLibCheck?: boolean;
-        skipDefaultLibCheck?: boolean;
-        sourceMap?: boolean;
-        sourceRoot?: string;
-        strict?: boolean;
-        strictFunctionTypes?: boolean;
-        strictNullChecks?: boolean;
-        strictPropertyInitialization?: boolean;
-        suppressExcessPropertyErrors?: boolean;
-        suppressImplicitAnyIndexErrors?: boolean;
-        target?: ScriptTarget;
-        traceResolution?: boolean;
-        resolveJsonModule?: boolean;
-        types?: string[];
-        /** Paths used to compute primary types search locations */
-        typeRoots?: string[];
-        esModuleInterop?: boolean;
-        [option: string]: CompilerOptionsValue | TsConfigSourceFile | undefined;
-    }
-    interface TypeAcquisition {
-        enableAutoDiscovery?: boolean;
-        enable?: boolean;
-        include?: string[];
-        exclude?: string[];
-        [option: string]: string[] | boolean | undefined;
-    }
-    enum ModuleKind {
-        None = 0,
-        CommonJS = 1,
-        AMD = 2,
-        UMD = 3,
-        System = 4,
-        ES2015 = 5,
-        ESNext = 6
-    }
-    enum JsxEmit {
-        None = 0,
-        Preserve = 1,
-        React = 2,
-        ReactNative = 3
-    }
-    enum NewLineKind {
-        CarriageReturnLineFeed = 0,
-        LineFeed = 1
-    }
-    interface LineAndCharacter {
-        /** 0-based. */
-        line: number;
-        character: number;
-    }
-    enum ScriptKind {
-        Unknown = 0,
-        JS = 1,
-        JSX = 2,
-        TS = 3,
-        TSX = 4,
-        External = 5,
-        JSON = 6,
-        /**
-         * Used on extensions that doesn't define the ScriptKind but the content defines it.
-         * Deferred extensions are going to be included in all project contexts.
-         */
-        Deferred = 7
-    }
-    enum ScriptTarget {
-        ES3 = 0,
-        ES5 = 1,
-        ES2015 = 2,
-        ES2016 = 3,
-        ES2017 = 4,
-        ES2018 = 5,
-        ESNext = 6,
-        JSON = 100,
-        Latest = 6
-    }
-    enum LanguageVariant {
-        Standard = 0,
-        JSX = 1
-    }
-    /** Either a parsed command line or a parsed tsconfig.json */
-    interface ParsedCommandLine {
-        options: CompilerOptions;
-        typeAcquisition?: TypeAcquisition;
-        fileNames: string[];
-        projectReferences?: ReadonlyArray<ProjectReference>;
-        raw?: any;
-        errors: Diagnostic[];
-        wildcardDirectories?: MapLike<WatchDirectoryFlags>;
-        compileOnSave?: boolean;
-    }
-    enum WatchDirectoryFlags {
-        None = 0,
-        Recursive = 1
-    }
-    interface ExpandResult {
-        fileNames: string[];
-        projectReferences: ReadonlyArray<ProjectReference> | undefined;
-        wildcardDirectories: MapLike<WatchDirectoryFlags>;
-    }
-    interface CreateProgramOptions {
-        rootNames: ReadonlyArray<string>;
-        options: CompilerOptions;
-        projectReferences?: ReadonlyArray<ProjectReference>;
-        host?: CompilerHost;
-        oldProgram?: Program;
-        configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>;
-    }
-    interface ModuleResolutionHost {
-        fileExists(fileName: string): boolean;
-        readFile(fileName: string): string | undefined;
-        trace?(s: string): void;
-        directoryExists?(directoryName: string): boolean;
-        /**
-         * Resolve a symbolic link.
-         * @see https://nodejs.org/api/fs.html#fs_fs_realpathsync_path_options
-         */
-        realpath?(path: string): string;
-        getCurrentDirectory?(): string;
-        getDirectories?(path: string): string[];
-    }
-    /**
-     * Represents the result of module resolution.
-     * Module resolution will pick up tsx/jsx/js files even if '--jsx' and '--allowJs' are turned off.
-     * The Program will then filter results based on these flags.
-     *
-     * Prefer to return a `ResolvedModuleFull` so that the file type does not have to be inferred.
-     */
-    interface ResolvedModule {
-        /** Path of the file the module was resolved to. */
-        resolvedFileName: string;
-        /** True if `resolvedFileName` comes from `node_modules`. */
-        isExternalLibraryImport?: boolean;
-    }
-    /**
-     * ResolvedModule with an explicitly provided `extension` property.
-     * Prefer this over `ResolvedModule`.
-     * If changing this, remember to change `moduleResolutionIsEqualTo`.
-     */
-    interface ResolvedModuleFull extends ResolvedModule {
-        /**
-         * Extension of resolvedFileName. This must match what's at the end of resolvedFileName.
-         * This is optional for backwards-compatibility, but will be added if not provided.
-         */
-        extension: Extension;
-        packageId?: PackageId;
-    }
-    /**
-     * Unique identifier with a package name and version.
-     * If changing this, remember to change `packageIdIsEqual`.
-     */
-    interface PackageId {
-        /**
-         * Name of the package.
-         * Should not include `@types`.
-         * If accessing a non-index file, this should include its name e.g. "foo/bar".
-         */
-        name: string;
-        /**
-         * Name of a submodule within this package.
-         * May be "".
-         */
-        subModuleName: string;
-        /** Version of the package, e.g. "1.2.3" */
-        version: string;
-    }
-    enum Extension {
-        Ts = ".ts",
-        Tsx = ".tsx",
-        Dts = ".d.ts",
-        Js = ".js",
-        Jsx = ".jsx",
-        Json = ".json"
-    }
-    interface ResolvedModuleWithFailedLookupLocations {
-        readonly resolvedModule: ResolvedModuleFull | undefined;
-    }
-    interface ResolvedTypeReferenceDirective {
-        primary: boolean;
-        resolvedFileName: string | undefined;
-        packageId?: PackageId;
-    }
-    interface ResolvedTypeReferenceDirectiveWithFailedLookupLocations {
-        readonly resolvedTypeReferenceDirective: ResolvedTypeReferenceDirective | undefined;
-        readonly failedLookupLocations: ReadonlyArray<string>;
-    }
-    interface CompilerHost extends ModuleResolutionHost {
-        getSourceFile(fileName: string, languageVersion: ScriptTarget, onError?: (message: string) => void, shouldCreateNewSourceFile?: boolean): SourceFile | undefined;
-        getSourceFileByPath?(fileName: string, path: Path, languageVersion: ScriptTarget, onError?: (message: string) => void, shouldCreateNewSourceFile?: boolean): SourceFile | undefined;
-        getCancellationToken?(): CancellationToken;
-        getDefaultLibFileName(options: CompilerOptions): string;
-        getDefaultLibLocation?(): string;
-        writeFile: WriteFileCallback;
-        getCurrentDirectory(): string;
-        getDirectories(path: string): string[];
-        getCanonicalFileName(fileName: string): string;
-        useCaseSensitiveFileNames(): boolean;
-        getNewLine(): string;
-        readDirectory?(rootDir: string, extensions: ReadonlyArray<string>, excludes: ReadonlyArray<string> | undefined, includes: ReadonlyArray<string>, depth?: number): string[];
-        resolveModuleNames?(moduleNames: string[], containingFile: string, reusedNames?: string[]): (ResolvedModule | undefined)[];
-        /**
-         * This method is a companion for 'resolveModuleNames' and is used to resolve 'types' references to actual type declaration files
-         */
-        resolveTypeReferenceDirectives?(typeReferenceDirectiveNames: string[], containingFile: string): ResolvedTypeReferenceDirective[];
-        getEnvironmentVariable?(name: string): string | undefined;
-        createHash?(data: string): string;
-        getModifiedTime?(fileName: string): Date;
-        setModifiedTime?(fileName: string, date: Date): void;
-        deleteFile?(fileName: string): void;
-    }
-    interface SourceMapRange extends TextRange {
-        source?: SourceMapSource;
-    }
-    interface SourceMapSource {
-        fileName: string;
-        text: string;
-        skipTrivia?: (pos: number) => number;
-    }
-    enum EmitFlags {
-        None = 0,
-        SingleLine = 1,
-        AdviseOnEmitNode = 2,
-        NoSubstitution = 4,
-        CapturesThis = 8,
-        NoLeadingSourceMap = 16,
-        NoTrailingSourceMap = 32,
-        NoSourceMap = 48,
-        NoNestedSourceMaps = 64,
-        NoTokenLeadingSourceMaps = 128,
-        NoTokenTrailingSourceMaps = 256,
-        NoTokenSourceMaps = 384,
-        NoLeadingComments = 512,
-        NoTrailingComments = 1024,
-        NoComments = 1536,
-        NoNestedComments = 2048,
-        HelperName = 4096,
-        ExportName = 8192,
-        LocalName = 16384,
-        InternalName = 32768,
-        Indented = 65536,
-        NoIndentation = 131072,
-        AsyncFunctionBody = 262144,
-        ReuseTempVariableScope = 524288,
-        CustomPrologue = 1048576,
-        NoHoisting = 2097152,
-        HasEndOfDeclarationMarker = 4194304,
-        Iterator = 8388608,
-        NoAsciiEscaping = 16777216
-    }
-    interface EmitHelper {
-        readonly name: string;
-        readonly scoped: boolean;
-        readonly text: string | ((node: EmitHelperUniqueNameCallback) => string);
-        readonly priority?: number;
-    }
-    type EmitHelperUniqueNameCallback = (name: string) => string;
-    enum EmitHint {
-        SourceFile = 0,
-        Expression = 1,
-        IdentifierName = 2,
-        MappedTypeParameter = 3,
-        Unspecified = 4
-    }
-    interface TransformationContext {
-        /** Gets the compiler options supplied to the transformer. */
-        getCompilerOptions(): CompilerOptions;
-        /** Starts a new lexical environment. */
-        startLexicalEnvironment(): void;
-        /** Suspends the current lexical environment, usually after visiting a parameter list. */
-        suspendLexicalEnvironment(): void;
-        /** Resumes a suspended lexical environment, usually before visiting a function body. */
-        resumeLexicalEnvironment(): void;
-        /** Ends a lexical environment, returning any declarations. */
-        endLexicalEnvironment(): Statement[] | undefined;
-        /** Hoists a function declaration to the containing scope. */
-        hoistFunctionDeclaration(node: FunctionDeclaration): void;
-        /** Hoists a variable declaration to the containing scope. */
-        hoistVariableDeclaration(node: Identifier): void;
-        /** Records a request for a non-scoped emit helper in the current context. */
-        requestEmitHelper(helper: EmitHelper): void;
-        /** Gets and resets the requested non-scoped emit helpers. */
-        readEmitHelpers(): EmitHelper[] | undefined;
-        /** Enables expression substitutions in the pretty printer for the provided SyntaxKind. */
-        enableSubstitution(kind: SyntaxKind): void;
-        /** Determines whether expression substitutions are enabled for the provided node. */
-        isSubstitutionEnabled(node: Node): boolean;
-        /**
-         * Hook used by transformers to substitute expressions just before they
-         * are emitted by the pretty printer.
-         *
-         * NOTE: Transformation hooks should only be modified during `Transformer` initialization,
-         * before returning the `NodeTransformer` callback.
-         */
-        onSubstituteNode: (hint: EmitHint, node: Node) => Node;
-        /**
-         * Enables before/after emit notifications in the pretty printer for the provided
-         * SyntaxKind.
-         */
-        enableEmitNotification(kind: SyntaxKind): void;
-        /**
-         * Determines whether before/after emit notifications should be raised in the pretty
-         * printer when it emits a node.
-         */
-        isEmitNotificationEnabled(node: Node): boolean;
-        /**
-         * Hook used to allow transformers to capture state before or after
-         * the printer emits a node.
-         *
-         * NOTE: Transformation hooks should only be modified during `Transformer` initialization,
-         * before returning the `NodeTransformer` callback.
-         */
-        onEmitNode: (hint: EmitHint, node: Node, emitCallback: (hint: EmitHint, node: Node) => void) => void;
-    }
-    interface TransformationResult<T extends Node> {
-        /** Gets the transformed source files. */
-        transformed: T[];
-        /** Gets diagnostics for the transformation. */
-        diagnostics?: DiagnosticWithLocation[];
-        /**
-         * Gets a substitute for a node, if one is available; otherwise, returns the original node.
-         *
-         * @param hint A hint as to the intended usage of the node.
-         * @param node The node to substitute.
-         */
-        substituteNode(hint: EmitHint, node: Node): Node;
-        /**
-         * Emits a node with possible notification.
-         *
-         * @param hint A hint as to the intended usage of the node.
-         * @param node The node to emit.
-         * @param emitCallback A callback used to emit the node.
-         */
-        emitNodeWithNotification(hint: EmitHint, node: Node, emitCallback: (hint: EmitHint, node: Node) => void): void;
-        /**
-         * Clean up EmitNode entries on any parse-tree nodes.
-         */
-        dispose(): void;
-    }
-    /**
-     * A function that is used to initialize and return a `Transformer` callback, which in turn
-     * will be used to transform one or more nodes.
-     */
-    type TransformerFactory<T extends Node> = (context: TransformationContext) => Transformer<T>;
-    /**
-     * A function that transforms a node.
-     */
-    type Transformer<T extends Node> = (node: T) => T;
-    /**
-     * A function that accepts and possibly transforms a node.
-     */
-    type Visitor = (node: Node) => VisitResult<Node>;
-    type VisitResult<T extends Node> = T | T[] | undefined;
-    interface Printer {
-        /**
-         * Print a node and its subtree as-is, without any emit transformations.
-         * @param hint A value indicating the purpose of a node. This is primarily used to
-         * distinguish between an `Identifier` used in an expression position, versus an
-         * `Identifier` used as an `IdentifierName` as part of a declaration. For most nodes you
-         * should just pass `Unspecified`.
-         * @param node The node to print. The node and its subtree are printed as-is, without any
-         * emit transformations.
-         * @param sourceFile A source file that provides context for the node. The source text of
-         * the file is used to emit the original source content for literals and identifiers, while
-         * the identifiers of the source file are used when generating unique names to avoid
-         * collisions.
-         */
-        printNode(hint: EmitHint, node: Node, sourceFile: SourceFile): string;
-        /**
-         * Prints a list of nodes using the given format flags
-         */
-        printList<T extends Node>(format: ListFormat, list: NodeArray<T>, sourceFile: SourceFile): string;
-        /**
-         * Prints a source file as-is, without any emit transformations.
-         */
-        printFile(sourceFile: SourceFile): string;
-        /**
-         * Prints a bundle of source files as-is, without any emit transformations.
-         */
-        printBundle(bundle: Bundle): string;
-    }
-    interface PrintHandlers {
-        /**
-         * A hook used by the Printer when generating unique names to avoid collisions with
-         * globally defined names that exist outside of the current source file.
-         */
-        hasGlobalName?(name: string): boolean;
-        /**
-         * A hook used by the Printer to provide notifications prior to emitting a node. A
-         * compatible implementation **must** invoke `emitCallback` with the provided `hint` and
-         * `node` values.
-         * @param hint A hint indicating the intended purpose of the node.
-         * @param node The node to emit.
-         * @param emitCallback A callback that, when invoked, will emit the node.
-         * @example
-         * ```ts
-         * var printer = createPrinter(printerOptions, {
-         *   onEmitNode(hint, node, emitCallback) {
-         *     // set up or track state prior to emitting the node...
-         *     emitCallback(hint, node);
-         *     // restore state after emitting the node...
-         *   }
-         * });
-         * ```
-         */
-        onEmitNode?(hint: EmitHint, node: Node | undefined, emitCallback: (hint: EmitHint, node: Node | undefined) => void): void;
-        /**
-         * A hook used by the Printer to perform just-in-time substitution of a node. This is
-         * primarily used by node transformations that need to substitute one node for another,
-         * such as replacing `myExportedVar` with `exports.myExportedVar`.
-         * @param hint A hint indicating the intended purpose of the node.
-         * @param node The node to emit.
-         * @example
-         * ```ts
-         * var printer = createPrinter(printerOptions, {
-         *   substituteNode(hint, node) {
-         *     // perform substitution if necessary...
-         *     return node;
-         *   }
-         * });
-         * ```
-         */
-        substituteNode?(hint: EmitHint, node: Node): Node;
-    }
-    interface PrinterOptions {
-        removeComments?: boolean;
-        newLine?: NewLineKind;
-        omitTrailingSemicolon?: boolean;
-        noEmitHelpers?: boolean;
-    }
-    interface GetEffectiveTypeRootsHost {
-        directoryExists?(directoryName: string): boolean;
-        getCurrentDirectory?(): string;
-    }
-    /** @deprecated See comment on SymbolWriter */
-    interface SymbolTracker {
-        trackSymbol?(symbol: Symbol, enclosingDeclaration?: Node, meaning?: SymbolFlags): void;
-        reportInaccessibleThisError?(): void;
-        reportPrivateInBaseOfClassExpression?(propertyName: string): void;
-        reportInaccessibleUniqueSymbolError?(): void;
-    }
-    interface TextSpan {
-        start: number;
-        length: number;
-    }
-    interface TextChangeRange {
-        span: TextSpan;
-        newLength: number;
-    }
-    interface SortedArray<T> extends Array<T> {
-        " __sortedArrayBrand": any;
-    }
-    interface SyntaxList extends Node {
-        _children: Node[];
-    }
-    enum ListFormat {
-        None = 0,
-        SingleLine = 0,
-        MultiLine = 1,
-        PreserveLines = 2,
-        LinesMask = 3,
-        NotDelimited = 0,
-        BarDelimited = 4,
-        AmpersandDelimited = 8,
-        CommaDelimited = 16,
-        DelimitersMask = 28,
-        AllowTrailingComma = 32,
-        Indented = 64,
-        SpaceBetweenBraces = 128,
-        SpaceBetweenSiblings = 256,
-        Braces = 512,
-        Parenthesis = 1024,
-        AngleBrackets = 2048,
-        SquareBrackets = 4096,
-        BracketsMask = 7680,
-        OptionalIfUndefined = 8192,
-        OptionalIfEmpty = 16384,
-        Optional = 24576,
-        PreferNewLine = 32768,
-        NoTrailingNewLine = 65536,
-        NoInterveningComments = 131072,
-        NoSpaceIfEmpty = 262144,
-        SingleElement = 524288,
-        Modifiers = 131328,
-        HeritageClauses = 256,
-        SingleLineTypeLiteralMembers = 384,
-        MultiLineTypeLiteralMembers = 16449,
-        TupleTypeElements = 272,
-        UnionTypeConstituents = 260,
-        IntersectionTypeConstituents = 264,
-        ObjectBindingPatternElements = 262576,
-        ArrayBindingPatternElements = 262448,
-        ObjectLiteralExpressionProperties = 263122,
-        ArrayLiteralExpressionElements = 4466,
-        CommaListElements = 272,
-        CallExpressionArguments = 1296,
-        NewExpressionArguments = 9488,
-        TemplateExpressionSpans = 131072,
-        SingleLineBlockStatements = 384,
-        MultiLineBlockStatements = 65,
-        VariableDeclarationList = 272,
-        SingleLineFunctionBodyStatements = 384,
-        MultiLineFunctionBodyStatements = 1,
-        ClassHeritageClauses = 0,
-        ClassMembers = 65,
-        InterfaceMembers = 65,
-        EnumMembers = 81,
-        CaseBlockClauses = 65,
-        NamedImportsOrExportsElements = 262576,
-        JsxElementOrFragmentChildren = 131072,
-        JsxElementAttributes = 131328,
-        CaseOrDefaultClauseStatements = 81985,
-        HeritageClauseTypes = 272,
-        SourceFileStatements = 65537,
-        Decorators = 24577,
-        TypeArguments = 26896,
-        TypeParameters = 26896,
-        Parameters = 1296,
-        IndexSignatureParameters = 4432
-    }
-}
-declare namespace ts {
-    const versionMajorMinor = "3.0";
-    /** The version of the TypeScript compiler release */
-    const version: string;
-}
-declare namespace ts {
-    function isExternalModuleNameRelative(moduleName: string): boolean;
-    function sortAndDeduplicateDiagnostics<T extends Diagnostic>(diagnostics: ReadonlyArray<T>): T[];
-}
-declare function setTimeout(handler: (...args: any[]) => void, timeout: number): any;
-declare function clearTimeout(handle: any): void;
-declare namespace ts {
-    enum FileWatcherEventKind {
-        Created = 0,
-        Changed = 1,
-        Deleted = 2
-    }
-    type FileWatcherCallback = (fileName: string, eventKind: FileWatcherEventKind) => void;
-    type DirectoryWatcherCallback = (fileName: string) => void;
-    interface System {
-        args: string[];
-        newLine: string;
-        useCaseSensitiveFileNames: boolean;
-        write(s: string): void;
-        writeOutputIsTTY?(): boolean;
-        readFile(path: string, encoding?: string): string | undefined;
-        getFileSize?(path: string): number;
-        writeFile(path: string, data: string, writeByteOrderMark?: boolean): void;
-        /**
-         * @pollingInterval - this parameter is used in polling-based watchers and ignored in watchers that
-         * use native OS file watching
-         */
-        watchFile?(path: string, callback: FileWatcherCallback, pollingInterval?: number): FileWatcher;
-        watchDirectory?(path: string, callback: DirectoryWatcherCallback, recursive?: boolean): FileWatcher;
-        resolvePath(path: string): string;
-        fileExists(path: string): boolean;
-        directoryExists(path: string): boolean;
-        createDirectory(path: string): void;
-        getExecutingFilePath(): string;
-        getCurrentDirectory(): string;
-        getDirectories(path: string): string[];
-        readDirectory(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
-        getModifiedTime?(path: string): Date;
-        setModifiedTime?(path: string, time: Date): void;
-        deleteFile?(path: string): void;
-        /**
-         * A good implementation is node.js' `crypto.createHash`. (https://nodejs.org/api/crypto.html#crypto_crypto_createhash_algorithm)
-         */
-        createHash?(data: string): string;
-        /** This must be cryptographically secure. Only implement this method using `crypto.createHash("sha256")`. */
-        createSHA256Hash?(data: string): string;
-        getMemoryUsage?(): number;
-        exit(exitCode?: number): void;
-        realpath?(path: string): string;
-        setTimeout?(callback: (...args: any[]) => void, ms: number, ...args: any[]): any;
-        clearTimeout?(timeoutId: any): void;
-        clearScreen?(): void;
-        base64decode?(input: string): string;
-        base64encode?(input: string): string;
-    }
-    interface FileWatcher {
-        close(): void;
-    }
-    function getNodeMajorVersion(): number | undefined;
-    let sys: System;
-}
-declare namespace ts {
-    type ErrorCallback = (message: DiagnosticMessage, length: number) => void;
-    interface Scanner {
-        getStartPos(): number;
-        getToken(): SyntaxKind;
-        getTextPos(): number;
-        getTokenPos(): number;
-        getTokenText(): string;
-        getTokenValue(): string;
-        hasExtendedUnicodeEscape(): boolean;
-        hasPrecedingLineBreak(): boolean;
-        isIdentifier(): boolean;
-        isReservedWord(): boolean;
-        isUnterminated(): boolean;
-        reScanGreaterToken(): SyntaxKind;
-        reScanSlashToken(): SyntaxKind;
-        reScanTemplateToken(): SyntaxKind;
-        scanJsxIdentifier(): SyntaxKind;
-        scanJsxAttributeValue(): SyntaxKind;
-        reScanJsxToken(): JsxTokenSyntaxKind;
-        scanJsxToken(): JsxTokenSyntaxKind;
-        scanJSDocToken(): JsDocSyntaxKind;
-        scan(): SyntaxKind;
-        getText(): string;
-        setText(text: string | undefined, start?: number, length?: number): void;
-        setOnError(onError: ErrorCallback | undefined): void;
-        setScriptTarget(scriptTarget: ScriptTarget): void;
-        setLanguageVariant(variant: LanguageVariant): void;
-        setTextPos(textPos: number): void;
-        lookAhead<T>(callback: () => T): T;
-        scanRange<T>(start: number, length: number, callback: () => T): T;
-        tryScan<T>(callback: () => T): T;
-    }
-    function tokenToString(t: SyntaxKind): string | undefined;
-    function getPositionOfLineAndCharacter(sourceFile: SourceFileLike, line: number, character: number): number;
-    function getLineAndCharacterOfPosition(sourceFile: SourceFileLike, position: number): LineAndCharacter;
-    function isWhiteSpaceLike(ch: number): boolean;
-    /** Does not include line breaks. For that, see isWhiteSpaceLike. */
-    function isWhiteSpaceSingleLine(ch: number): boolean;
-    function isLineBreak(ch: number): boolean;
-    function couldStartTrivia(text: string, pos: number): boolean;
-    function forEachLeadingCommentRange<U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean) => U): U | undefined;
-    function forEachLeadingCommentRange<T, U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean, state: T) => U, state: T): U | undefined;
-    function forEachTrailingCommentRange<U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean) => U): U | undefined;
-    function forEachTrailingCommentRange<T, U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean, state: T) => U, state: T): U | undefined;
-    function reduceEachLeadingCommentRange<T, U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean, state: T, memo: U) => U, state: T, initial: U): U | undefined;
-    function reduceEachTrailingCommentRange<T, U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean, state: T, memo: U) => U, state: T, initial: U): U | undefined;
-    function getLeadingCommentRanges(text: string, pos: number): CommentRange[] | undefined;
-    function getTrailingCommentRanges(text: string, pos: number): CommentRange[] | undefined;
-    /** Optionally, get the shebang */
-    function getShebang(text: string): string | undefined;
-    function isIdentifierStart(ch: number, languageVersion: ScriptTarget | undefined): boolean;
-    function isIdentifierPart(ch: number, languageVersion: ScriptTarget | undefined): boolean;
-    function createScanner(languageVersion: ScriptTarget, skipTrivia: boolean, languageVariant?: LanguageVariant, textInitial?: string, onError?: ErrorCallback, start?: number, length?: number): Scanner;
-}
-declare namespace ts {
-    function getDefaultLibFileName(options: CompilerOptions): string;
-    function textSpanEnd(span: TextSpan): number;
-    function textSpanIsEmpty(span: TextSpan): boolean;
-    function textSpanContainsPosition(span: TextSpan, position: number): boolean;
-    function textSpanContainsTextSpan(span: TextSpan, other: TextSpan): boolean;
-    function textSpanOverlapsWith(span: TextSpan, other: TextSpan): boolean;
-    function textSpanOverlap(span1: TextSpan, span2: TextSpan): TextSpan | undefined;
-    function textSpanIntersectsWithTextSpan(span: TextSpan, other: TextSpan): boolean;
-    function textSpanIntersectsWith(span: TextSpan, start: number, length: number): boolean;
-    function decodedTextSpanIntersectsWith(start1: number, length1: number, start2: number, length2: number): boolean;
-    function textSpanIntersectsWithPosition(span: TextSpan, position: number): boolean;
-    function textSpanIntersection(span1: TextSpan, span2: TextSpan): TextSpan | undefined;
-    function createTextSpan(start: number, length: number): TextSpan;
-    function createTextSpanFromBounds(start: number, end: number): TextSpan;
-    function textChangeRangeNewSpan(range: TextChangeRange): TextSpan;
-    function textChangeRangeIsUnchanged(range: TextChangeRange): boolean;
-    function createTextChangeRange(span: TextSpan, newLength: number): TextChangeRange;
-    let unchangedTextChangeRange: TextChangeRange;
-    /**
-     * Called to merge all the changes that occurred across several versions of a script snapshot
-     * into a single change.  i.e. if a user keeps making successive edits to a script we will
-     * have a text change from V1 to V2, V2 to V3, ..., Vn.
-     *
-     * This function will then merge those changes into a single change range valid between V1 and
-     * Vn.
-     */
-    function collapseTextChangeRangesAcrossMultipleVersions(changes: ReadonlyArray<TextChangeRange>): TextChangeRange;
-    function getTypeParameterOwner(d: Declaration): Declaration | undefined;
-    type ParameterPropertyDeclaration = ParameterDeclaration & {
-        parent: ConstructorDeclaration;
-        name: Identifier;
-    };
-    function isParameterPropertyDeclaration(node: Node): node is ParameterPropertyDeclaration;
-    function isEmptyBindingPattern(node: BindingName): node is BindingPattern;
-    function isEmptyBindingElement(node: BindingElement): boolean;
-    function getCombinedModifierFlags(node: Node): ModifierFlags;
-    function getCombinedNodeFlags(node: Node): NodeFlags;
-    /**
-     * Checks to see if the locale is in the appropriate format,
-     * and if it is, attempts to set the appropriate language.
-     */
-    function validateLocaleAndSetLanguage(locale: string, sys: {
-        getExecutingFilePath(): string;
-        resolvePath(path: string): string;
-        fileExists(fileName: string): boolean;
-        readFile(fileName: string): string | undefined;
-    }, errors?: Push<Diagnostic>): void;
-    function getOriginalNode(node: Node): Node;
-    function getOriginalNode<T extends Node>(node: Node, nodeTest: (node: Node) => node is T): T;
-    function getOriginalNode(node: Node | undefined): Node | undefined;
-    function getOriginalNode<T extends Node>(node: Node | undefined, nodeTest: (node: Node | undefined) => node is T): T | undefined;
-    /**
-     * Gets a value indicating whether a node originated in the parse tree.
-     *
-     * @param node The node to test.
-     */
-    function isParseTreeNode(node: Node): boolean;
-    /**
-     * Gets the original parse tree node for a node.
-     *
-     * @param node The original node.
-     * @returns The original parse tree node if found; otherwise, undefined.
-     */
-    function getParseTreeNode(node: Node): Node;
-    /**
-     * Gets the original parse tree node for a node.
-     *
-     * @param node The original node.
-     * @param nodeTest A callback used to ensure the correct type of parse tree node is returned.
-     * @returns The original parse tree node if found; otherwise, undefined.
-     */
-    function getParseTreeNode<T extends Node>(node: Node | undefined, nodeTest?: (node: Node) => node is T): T | undefined;
-    /**
-     * Remove extra underscore from escaped identifier text content.
-     *
-     * @param identifier The escaped identifier text.
-     * @returns The unescaped identifier text.
-     */
-    function unescapeLeadingUnderscores(identifier: __String): string;
-    function idText(identifier: Identifier): string;
-    function symbolName(symbol: Symbol): string;
-    /**
-     * Remove extra underscore from escaped identifier text content.
-     * @deprecated Use `id.text` for the unescaped text.
-     * @param identifier The escaped identifier text.
-     * @returns The unescaped identifier text.
-     */
-    function unescapeIdentifier(id: string): string;
-    function getNameOfJSDocTypedef(declaration: JSDocTypedefTag): Identifier | undefined;
-    function getNameOfDeclaration(declaration: Declaration | Expression): DeclarationName;
-    /**
-     * Gets the JSDoc parameter tags for the node if present.
-     *
-     * @remarks Returns any JSDoc param tag that matches the provided
-     * parameter, whether a param tag on a containing function
-     * expression, or a param tag on a variable declaration whose
-     * initializer is the containing function. The tags closest to the
-     * node are returned first, so in the previous example, the param
-     * tag on the containing function expression would be first.
-     *
-     * Does not return tags for binding patterns, because JSDoc matches
-     * parameters by name and binding patterns do not have a name.
-     */
-    function getJSDocParameterTags(param: ParameterDeclaration): ReadonlyArray<JSDocParameterTag>;
-    /**
-     * Return true if the node has JSDoc parameter tags.
-     *
-     * @remarks Includes parameter tags that are not directly on the node,
-     * for example on a variable declaration whose initializer is a function expression.
-     */
-    function hasJSDocParameterTags(node: FunctionLikeDeclaration | SignatureDeclaration): boolean;
-    /** Gets the JSDoc augments tag for the node if present */
-    function getJSDocAugmentsTag(node: Node): JSDocAugmentsTag | undefined;
-    /** Gets the JSDoc class tag for the node if present */
-    function getJSDocClassTag(node: Node): JSDocClassTag | undefined;
-    /** Gets the JSDoc return tag for the node if present */
-    function getJSDocReturnTag(node: Node): JSDocReturnTag | undefined;
-    /** Gets the JSDoc template tag for the node if present */
-    function getJSDocTemplateTag(node: Node): JSDocTemplateTag | undefined;
-    /** Gets the JSDoc type tag for the node if present and valid */
-    function getJSDocTypeTag(node: Node): JSDocTypeTag | undefined;
-    /**
-     * Gets the type node for the node if provided via JSDoc.
-     *
-     * @remarks The search includes any JSDoc param tag that relates
-     * to the provided parameter, for example a type tag on the
-     * parameter itself, or a param tag on a containing function
-     * expression, or a param tag on a variable declaration whose
-     * initializer is the containing function. The tags closest to the
-     * node are examined first, so in the previous example, the type
-     * tag directly on the node would be returned.
-     */
-    function getJSDocType(node: Node): TypeNode | undefined;
-    /**
-     * Gets the return type node for the node if provided via JSDoc's return tag.
-     *
-     * @remarks `getJSDocReturnTag` just gets the whole JSDoc tag. This function
-     * gets the type from inside the braces.
-     */
-    function getJSDocReturnType(node: Node): TypeNode | undefined;
-    /** Get all JSDoc tags related to a node, including those on parent nodes. */
-    function getJSDocTags(node: Node): ReadonlyArray<JSDocTag>;
-    /** Gets all JSDoc tags of a specified kind, or undefined if not present. */
-    function getAllJSDocTagsOfKind(node: Node, kind: SyntaxKind): ReadonlyArray<JSDocTag>;
-}
-declare namespace ts {
-    function isNumericLiteral(node: Node): node is NumericLiteral;
-    function isStringLiteral(node: Node): node is StringLiteral;
-    function isJsxText(node: Node): node is JsxText;
-    function isRegularExpressionLiteral(node: Node): node is RegularExpressionLiteral;
-    function isNoSubstitutionTemplateLiteral(node: Node): node is NoSubstitutionTemplateLiteral;
-    function isTemplateHead(node: Node): node is TemplateHead;
-    function isTemplateMiddle(node: Node): node is TemplateMiddle;
-    function isTemplateTail(node: Node): node is TemplateTail;
-    function isIdentifier(node: Node): node is Identifier;
-    function isQualifiedName(node: Node): node is QualifiedName;
-    function isComputedPropertyName(node: Node): node is ComputedPropertyName;
-    function isTypeParameterDeclaration(node: Node): node is TypeParameterDeclaration;
-    function isParameter(node: Node): node is ParameterDeclaration;
-    function isDecorator(node: Node): node is Decorator;
-    function isPropertySignature(node: Node): node is PropertySignature;
-    function isPropertyDeclaration(node: Node): node is PropertyDeclaration;
-    function isMethodSignature(node: Node): node is MethodSignature;
-    function isMethodDeclaration(node: Node): node is MethodDeclaration;
-    function isConstructorDeclaration(node: Node): node is ConstructorDeclaration;
-    function isGetAccessorDeclaration(node: Node): node is GetAccessorDeclaration;
-    function isSetAccessorDeclaration(node: Node): node is SetAccessorDeclaration;
-    function isCallSignatureDeclaration(node: Node): node is CallSignatureDeclaration;
-    function isConstructSignatureDeclaration(node: Node): node is ConstructSignatureDeclaration;
-    function isIndexSignatureDeclaration(node: Node): node is IndexSignatureDeclaration;
-    function isTypePredicateNode(node: Node): node is TypePredicateNode;
-    function isTypeReferenceNode(node: Node): node is TypeReferenceNode;
-    function isFunctionTypeNode(node: Node): node is FunctionTypeNode;
-    function isConstructorTypeNode(node: Node): node is ConstructorTypeNode;
-    function isTypeQueryNode(node: Node): node is TypeQueryNode;
-    function isTypeLiteralNode(node: Node): node is TypeLiteralNode;
-    function isArrayTypeNode(node: Node): node is ArrayTypeNode;
-    function isTupleTypeNode(node: Node): node is TupleTypeNode;
-    function isUnionTypeNode(node: Node): node is UnionTypeNode;
-    function isIntersectionTypeNode(node: Node): node is IntersectionTypeNode;
-    function isConditionalTypeNode(node: Node): node is ConditionalTypeNode;
-    function isInferTypeNode(node: Node): node is InferTypeNode;
-    function isParenthesizedTypeNode(node: Node): node is ParenthesizedTypeNode;
-    function isThisTypeNode(node: Node): node is ThisTypeNode;
-    function isTypeOperatorNode(node: Node): node is TypeOperatorNode;
-    function isIndexedAccessTypeNode(node: Node): node is IndexedAccessTypeNode;
-    function isMappedTypeNode(node: Node): node is MappedTypeNode;
-    function isLiteralTypeNode(node: Node): node is LiteralTypeNode;
-    function isImportTypeNode(node: Node): node is ImportTypeNode;
-    function isObjectBindingPattern(node: Node): node is ObjectBindingPattern;
-    function isArrayBindingPattern(node: Node): node is ArrayBindingPattern;
-    function isBindingElement(node: Node): node is BindingElement;
-    function isArrayLiteralExpression(node: Node): node is ArrayLiteralExpression;
-    function isObjectLiteralExpression(node: Node): node is ObjectLiteralExpression;
-    function isPropertyAccessExpression(node: Node): node is PropertyAccessExpression;
-    function isElementAccessExpression(node: Node): node is ElementAccessExpression;
-    function isCallExpression(node: Node): node is CallExpression;
-    function isNewExpression(node: Node): node is NewExpression;
-    function isTaggedTemplateExpression(node: Node): node is TaggedTemplateExpression;
-    function isTypeAssertion(node: Node): node is TypeAssertion;
-    function isParenthesizedExpression(node: Node): node is ParenthesizedExpression;
-    function skipPartiallyEmittedExpressions(node: Expression): Expression;
-    function skipPartiallyEmittedExpressions(node: Node): Node;
-    function isFunctionExpression(node: Node): node is FunctionExpression;
-    function isArrowFunction(node: Node): node is ArrowFunction;
-    function isDeleteExpression(node: Node): node is DeleteExpression;
-    function isTypeOfExpression(node: Node): node is TypeOfExpression;
-    function isVoidExpression(node: Node): node is VoidExpression;
-    function isAwaitExpression(node: Node): node is AwaitExpression;
-    function isPrefixUnaryExpression(node: Node): node is PrefixUnaryExpression;
-    function isPostfixUnaryExpression(node: Node): node is PostfixUnaryExpression;
-    function isBinaryExpression(node: Node): node is BinaryExpression;
-    function isConditionalExpression(node: Node): node is ConditionalExpression;
-    function isTemplateExpression(node: Node): node is TemplateExpression;
-    function isYieldExpression(node: Node): node is YieldExpression;
-    function isSpreadElement(node: Node): node is SpreadElement;
-    function isClassExpression(node: Node): node is ClassExpression;
-    function isOmittedExpression(node: Node): node is OmittedExpression;
-    function isExpressionWithTypeArguments(node: Node): node is ExpressionWithTypeArguments;
-    function isAsExpression(node: Node): node is AsExpression;
-    function isNonNullExpression(node: Node): node is NonNullExpression;
-    function isMetaProperty(node: Node): node is MetaProperty;
-    function isTemplateSpan(node: Node): node is TemplateSpan;
-    function isSemicolonClassElement(node: Node): node is SemicolonClassElement;
-    function isBlock(node: Node): node is Block;
-    function isVariableStatement(node: Node): node is VariableStatement;
-    function isEmptyStatement(node: Node): node is EmptyStatement;
-    function isExpressionStatement(node: Node): node is ExpressionStatement;
-    function isIfStatement(node: Node): node is IfStatement;
-    function isDoStatement(node: Node): node is DoStatement;
-    function isWhileStatement(node: Node): node is WhileStatement;
-    function isForStatement(node: Node): node is ForStatement;
-    function isForInStatement(node: Node): node is ForInStatement;
-    function isForOfStatement(node: Node): node is ForOfStatement;
-    function isContinueStatement(node: Node): node is ContinueStatement;
-    function isBreakStatement(node: Node): node is BreakStatement;
-    function isBreakOrContinueStatement(node: Node): node is BreakOrContinueStatement;
-    function isReturnStatement(node: Node): node is ReturnStatement;
-    function isWithStatement(node: Node): node is WithStatement;
-    function isSwitchStatement(node: Node): node is SwitchStatement;
-    function isLabeledStatement(node: Node): node is LabeledStatement;
-    function isThrowStatement(node: Node): node is ThrowStatement;
-    function isTryStatement(node: Node): node is TryStatement;
-    function isDebuggerStatement(node: Node): node is DebuggerStatement;
-    function isVariableDeclaration(node: Node): node is VariableDeclaration;
-    function isVariableDeclarationList(node: Node): node is VariableDeclarationList;
-    function isFunctionDeclaration(node: Node): node is FunctionDeclaration;
-    function isClassDeclaration(node: Node): node is ClassDeclaration;
-    function isInterfaceDeclaration(node: Node): node is InterfaceDeclaration;
-    function isTypeAliasDeclaration(node: Node): node is TypeAliasDeclaration;
-    function isEnumDeclaration(node: Node): node is EnumDeclaration;
-    function isModuleDeclaration(node: Node): node is ModuleDeclaration;
-    function isModuleBlock(node: Node): node is ModuleBlock;
-    function isCaseBlock(node: Node): node is CaseBlock;
-    function isNamespaceExportDeclaration(node: Node): node is NamespaceExportDeclaration;
-    function isImportEqualsDeclaration(node: Node): node is ImportEqualsDeclaration;
-    function isImportDeclaration(node: Node): node is ImportDeclaration;
-    function isImportClause(node: Node): node is ImportClause;
-    function isNamespaceImport(node: Node): node is NamespaceImport;
-    function isNamedImports(node: Node): node is NamedImports;
-    function isImportSpecifier(node: Node): node is ImportSpecifier;
-    function isExportAssignment(node: Node): node is ExportAssignment;
-    function isExportDeclaration(node: Node): node is ExportDeclaration;
-    function isNamedExports(node: Node): node is NamedExports;
-    function isExportSpecifier(node: Node): node is ExportSpecifier;
-    function isMissingDeclaration(node: Node): node is MissingDeclaration;
-    function isExternalModuleReference(node: Node): node is ExternalModuleReference;
-    function isJsxElement(node: Node): node is JsxElement;
-    function isJsxSelfClosingElement(node: Node): node is JsxSelfClosingElement;
-    function isJsxOpeningElement(node: Node): node is JsxOpeningElement;
-    function isJsxClosingElement(node: Node): node is JsxClosingElement;
-    function isJsxFragment(node: Node): node is JsxFragment;
-    function isJsxOpeningFragment(node: Node): node is JsxOpeningFragment;
-    function isJsxClosingFragment(node: Node): node is JsxClosingFragment;
-    function isJsxAttribute(node: Node): node is JsxAttribute;
-    function isJsxAttributes(node: Node): node is JsxAttributes;
-    function isJsxSpreadAttribute(node: Node): node is JsxSpreadAttribute;
-    function isJsxExpression(node: Node): node is JsxExpression;
-    function isCaseClause(node: Node): node is CaseClause;
-    function isDefaultClause(node: Node): node is DefaultClause;
-    function isHeritageClause(node: Node): node is HeritageClause;
-    function isCatchClause(node: Node): node is CatchClause;
-    function isPropertyAssignment(node: Node): node is PropertyAssignment;
-    function isShorthandPropertyAssignment(node: Node): node is ShorthandPropertyAssignment;
-    function isSpreadAssignment(node: Node): node is SpreadAssignment;
-    function isEnumMember(node: Node): node is EnumMember;
-    function isSourceFile(node: Node): node is SourceFile;
-    function isBundle(node: Node): node is Bundle;
-    function isUnparsedSource(node: Node): node is UnparsedSource;
-    function isJSDocTypeExpression(node: Node): node is JSDocTypeExpression;
-    function isJSDocAllType(node: JSDocAllType): node is JSDocAllType;
-    function isJSDocUnknownType(node: Node): node is JSDocUnknownType;
-    function isJSDocNullableType(node: Node): node is JSDocNullableType;
-    function isJSDocNonNullableType(node: Node): node is JSDocNonNullableType;
-    function isJSDocOptionalType(node: Node): node is JSDocOptionalType;
-    function isJSDocFunctionType(node: Node): node is JSDocFunctionType;
-    function isJSDocVariadicType(node: Node): node is JSDocVariadicType;
-    function isJSDoc(node: Node): node is JSDoc;
-    function isJSDocAugmentsTag(node: Node): node is JSDocAugmentsTag;
-    function isJSDocClassTag(node: Node): node is JSDocClassTag;
-    function isJSDocParameterTag(node: Node): node is JSDocParameterTag;
-    function isJSDocReturnTag(node: Node): node is JSDocReturnTag;
-    function isJSDocTypeTag(node: Node): node is JSDocTypeTag;
-    function isJSDocTemplateTag(node: Node): node is JSDocTemplateTag;
-    function isJSDocTypedefTag(node: Node): node is JSDocTypedefTag;
-    function isJSDocPropertyTag(node: Node): node is JSDocPropertyTag;
-    function isJSDocPropertyLikeTag(node: Node): node is JSDocPropertyLikeTag;
-    function isJSDocTypeLiteral(node: Node): node is JSDocTypeLiteral;
-    function isJSDocCallbackTag(node: Node): node is JSDocCallbackTag;
-    function isJSDocSignature(node: Node): node is JSDocSignature;
-}
-declare namespace ts {
-    /**
-     * True if node is of some token syntax kind.
-     * For example, this is true for an IfKeyword but not for an IfStatement.
-     * Literals are considered tokens, except TemplateLiteral, but does include TemplateHead/Middle/Tail.
-     */
-    function isToken(n: Node): boolean;
-    function isLiteralExpression(node: Node): node is LiteralExpression;
-    type TemplateLiteralToken = NoSubstitutionTemplateLiteral | TemplateHead | TemplateMiddle | TemplateTail;
-    function isTemplateLiteralToken(node: Node): node is TemplateLiteralToken;
-    function isTemplateMiddleOrTemplateTail(node: Node): node is TemplateMiddle | TemplateTail;
-    function isStringTextContainingNode(node: Node): node is StringLiteral | TemplateLiteralToken;
-    function isModifier(node: Node): node is Modifier;
-    function isEntityName(node: Node): node is EntityName;
-    function isPropertyName(node: Node): node is PropertyName;
-    function isBindingName(node: Node): node is BindingName;
-    function isFunctionLike(node: Node): node is SignatureDeclaration;
-    function isClassElement(node: Node): node is ClassElement;
-    function isClassLike(node: Node): node is ClassLikeDeclaration;
-    function isAccessor(node: Node): node is AccessorDeclaration;
-    function isTypeElement(node: Node): node is TypeElement;
-    function isClassOrTypeElement(node: Node): node is ClassElement | TypeElement;
-    function isObjectLiteralElementLike(node: Node): node is ObjectLiteralElementLike;
-    /**
-     * Node test that determines whether a node is a valid type node.
-     * This differs from the `isPartOfTypeNode` function which determines whether a node is *part*
-     * of a TypeNode.
-     */
-    function isTypeNode(node: Node): node is TypeNode;
-    function isFunctionOrConstructorTypeNode(node: Node): node is FunctionTypeNode | ConstructorTypeNode;
-    function isPropertyAccessOrQualifiedName(node: Node): node is PropertyAccessExpression | QualifiedName;
-    function isCallLikeExpression(node: Node): node is CallLikeExpression;
-    function isCallOrNewExpression(node: Node): node is CallExpression | NewExpression;
-    function isTemplateLiteral(node: Node): node is TemplateLiteral;
-    function isAssertionExpression(node: Node): node is AssertionExpression;
-    function isIterationStatement(node: Node, lookInLabeledStatements: false): node is IterationStatement;
-    function isIterationStatement(node: Node, lookInLabeledStatements: boolean): node is IterationStatement | LabeledStatement;
-    function isJsxOpeningLikeElement(node: Node): node is JsxOpeningLikeElement;
-    function isCaseOrDefaultClause(node: Node): node is CaseOrDefaultClause;
-    /** True if node is of a kind that may contain comment text. */
-    function isJSDocCommentContainingNode(node: Node): boolean;
-    function isSetAccessor(node: Node): node is SetAccessorDeclaration;
-    function isGetAccessor(node: Node): node is GetAccessorDeclaration;
-    function isObjectLiteralElement(node: Node): node is ObjectLiteralElement;
-    function isStringLiteralLike(node: Node): node is StringLiteralLike;
-}
-declare namespace ts {
-    function createNode(kind: SyntaxKind, pos?: number, end?: number): Node;
-    /**
-     * Invokes a callback for each child of the given node. The 'cbNode' callback is invoked for all child nodes
-     * stored in properties. If a 'cbNodes' callback is specified, it is invoked for embedded arrays; otherwise,
-     * embedded arrays are flattened and the 'cbNode' callback is invoked for each element. If a callback returns
-     * a truthy value, iteration stops and that value is returned. Otherwise, undefined is returned.
-     *
-     * @param node a given node to visit its children
-     * @param cbNode a callback to be invoked for all child nodes
-     * @param cbNodes a callback to be invoked for embedded array
-     *
-     * @remarks `forEachChild` must visit the children of a node in the order
-     * that they appear in the source code. The language service depends on this property to locate nodes by position.
-     */
-    function forEachChild<T>(node: Node, cbNode: (node: Node) => T | undefined, cbNodes?: (nodes: NodeArray<Node>) => T | undefined): T | undefined;
-    function createSourceFile(fileName: string, sourceText: string, languageVersion: ScriptTarget, setParentNodes?: boolean, scriptKind?: ScriptKind): SourceFile;
-    function parseIsolatedEntityName(text: string, languageVersion: ScriptTarget): EntityName | undefined;
-    /**
-     * Parse json text into SyntaxTree and return node and parse errors if any
-     * @param fileName
-     * @param sourceText
-     */
-    function parseJsonText(fileName: string, sourceText: string): JsonSourceFile;
-    function isExternalModule(file: SourceFile): boolean;
-    function updateSourceFile(sourceFile: SourceFile, newText: string, textChangeRange: TextChangeRange, aggressiveChecks?: boolean): SourceFile;
-}
-declare namespace ts {
-    function getEffectiveTypeRoots(options: CompilerOptions, host: GetEffectiveTypeRootsHost): string[] | undefined;
-    /**
-     * @param {string | undefined} containingFile - file that contains type reference directive, can be undefined if containing file is unknown.
-     * This is possible in case if resolution is performed for directives specified via 'types' parameter. In this case initial path for secondary lookups
-     * is assumed to be the same as root directory of the project.
-     */
-    function resolveTypeReferenceDirective(typeReferenceDirectiveName: string, containingFile: string | undefined, options: CompilerOptions, host: ModuleResolutionHost): ResolvedTypeReferenceDirectiveWithFailedLookupLocations;
-    /**
-     * Given a set of options, returns the set of type directive names
-     *   that should be included for this program automatically.
-     * This list could either come from the config file,
-     *   or from enumerating the types root + initial secondary types lookup location.
-     * More type directives might appear in the program later as a result of loading actual source files;
-     *   this list is only the set of defaults that are implicitly included.
-     */
-    function getAutomaticTypeDirectiveNames(options: CompilerOptions, host: ModuleResolutionHost): string[];
-    /**
-     * Cached module resolutions per containing directory.
-     * This assumes that any module id will have the same resolution for sibling files located in the same folder.
-     */
-    interface ModuleResolutionCache extends NonRelativeModuleNameResolutionCache {
-        getOrCreateCacheForDirectory(directoryName: string): Map<ResolvedModuleWithFailedLookupLocations>;
-    }
-    /**
-     * Stored map from non-relative module name to a table: directory -> result of module lookup in this directory
-     * We support only non-relative module names because resolution of relative module names is usually more deterministic and thus less expensive.
-     */
-    interface NonRelativeModuleNameResolutionCache {
-        getOrCreateCacheForModuleName(nonRelativeModuleName: string): PerModuleNameCache;
-    }
-    interface PerModuleNameCache {
-        get(directory: string): ResolvedModuleWithFailedLookupLocations | undefined;
-        set(directory: string, result: ResolvedModuleWithFailedLookupLocations): void;
-    }
-    function createModuleResolutionCache(currentDirectory: string, getCanonicalFileName: (s: string) => string): ModuleResolutionCache;
-    function resolveModuleNameFromCache(moduleName: string, containingFile: string, cache: ModuleResolutionCache): ResolvedModuleWithFailedLookupLocations | undefined;
-    function resolveModuleName(moduleName: string, containingFile: string, compilerOptions: CompilerOptions, host: ModuleResolutionHost, cache?: ModuleResolutionCache): ResolvedModuleWithFailedLookupLocations;
-    function nodeModuleNameResolver(moduleName: string, containingFile: string, compilerOptions: CompilerOptions, host: ModuleResolutionHost, cache?: ModuleResolutionCache): ResolvedModuleWithFailedLookupLocations;
-    function classicNameResolver(moduleName: string, containingFile: string, compilerOptions: CompilerOptions, host: ModuleResolutionHost, cache?: NonRelativeModuleNameResolutionCache): ResolvedModuleWithFailedLookupLocations;
-}
-declare namespace ts {
-    function createNodeArray<T extends Node>(elements?: ReadonlyArray<T>, hasTrailingComma?: boolean): NodeArray<T>;
-    /** If a node is passed, creates a string literal whose source text is read from a source node during emit. */
-    function createLiteral(value: string | StringLiteral | NoSubstitutionTemplateLiteral | NumericLiteral | Identifier): StringLiteral;
-    function createLiteral(value: number): NumericLiteral;
-    function createLiteral(value: boolean): BooleanLiteral;
-    function createLiteral(value: string | number | boolean): PrimaryExpression;
-    function createNumericLiteral(value: string): NumericLiteral;
-    function createStringLiteral(text: string): StringLiteral;
-    function createRegularExpressionLiteral(text: string): RegularExpressionLiteral;
-    function createIdentifier(text: string): Identifier;
-    function updateIdentifier(node: Identifier): Identifier;
-    /** Create a unique temporary variable. */
-    function createTempVariable(recordTempVariable: ((node: Identifier) => void) | undefined): Identifier;
-    /** Create a unique temporary variable for use in a loop. */
-    function createLoopVariable(): Identifier;
-    /** Create a unique name based on the supplied text. */
-    function createUniqueName(text: string): Identifier;
-    /** Create a unique name based on the supplied text. */
-    function createOptimisticUniqueName(text: string): Identifier;
-    /** Create a unique name based on the supplied text. This does not consider names injected by the transformer. */
-    function createFileLevelUniqueName(text: string): Identifier;
-    /** Create a unique name generated for a node. */
-    function getGeneratedNameForNode(node: Node): Identifier;
-    function createToken<TKind extends SyntaxKind>(token: TKind): Token<TKind>;
-    function createSuper(): SuperExpression;
-    function createThis(): ThisExpression & Token<SyntaxKind.ThisKeyword>;
-    function createNull(): NullLiteral & Token<SyntaxKind.NullKeyword>;
-    function createTrue(): BooleanLiteral & Token<SyntaxKind.TrueKeyword>;
-    function createFalse(): BooleanLiteral & Token<SyntaxKind.FalseKeyword>;
-    function createModifier<T extends Modifier["kind"]>(kind: T): Token<T>;
-    function createModifiersFromModifierFlags(flags: ModifierFlags): Modifier[];
-    function createQualifiedName(left: EntityName, right: string | Identifier): QualifiedName;
-    function updateQualifiedName(node: QualifiedName, left: EntityName, right: Identifier): QualifiedName;
-    function createComputedPropertyName(expression: Expression): ComputedPropertyName;
-    function updateComputedPropertyName(node: ComputedPropertyName, expression: Expression): ComputedPropertyName;
-    function createTypeParameterDeclaration(name: string | Identifier, constraint?: TypeNode, defaultType?: TypeNode): TypeParameterDeclaration;
-    function updateTypeParameterDeclaration(node: TypeParameterDeclaration, name: Identifier, constraint: TypeNode | undefined, defaultType: TypeNode | undefined): TypeParameterDeclaration;
-    function createParameter(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, dotDotDotToken: DotDotDotToken | undefined, name: string | BindingName, questionToken?: QuestionToken, type?: TypeNode, initializer?: Expression): ParameterDeclaration;
-    function updateParameter(node: ParameterDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, dotDotDotToken: DotDotDotToken | undefined, name: string | BindingName, questionToken: QuestionToken | undefined, type: TypeNode | undefined, initializer: Expression | undefined): ParameterDeclaration;
-    function createDecorator(expression: Expression): Decorator;
-    function updateDecorator(node: Decorator, expression: Expression): Decorator;
-    function createPropertySignature(modifiers: ReadonlyArray<Modifier> | undefined, name: PropertyName | string, questionToken: QuestionToken | undefined, type: TypeNode | undefined, initializer: Expression | undefined): PropertySignature;
-    function updatePropertySignature(node: PropertySignature, modifiers: ReadonlyArray<Modifier> | undefined, name: PropertyName, questionToken: QuestionToken | undefined, type: TypeNode | undefined, initializer: Expression | undefined): PropertySignature;
-    function createProperty(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | PropertyName, questionOrExclamationToken: QuestionToken | ExclamationToken | undefined, type: TypeNode | undefined, initializer: Expression | undefined): PropertyDeclaration;
-    function updateProperty(node: PropertyDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | PropertyName, questionOrExclamationToken: QuestionToken | ExclamationToken | undefined, type: TypeNode | undefined, initializer: Expression | undefined): PropertyDeclaration;
-    function createMethodSignature(typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, name: string | PropertyName, questionToken: QuestionToken | undefined): MethodSignature;
-    function updateMethodSignature(node: MethodSignature, typeParameters: NodeArray<TypeParameterDeclaration> | undefined, parameters: NodeArray<ParameterDeclaration>, type: TypeNode | undefined, name: PropertyName, questionToken: QuestionToken | undefined): MethodSignature;
-    function createMethod(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, asteriskToken: AsteriskToken | undefined, name: string | PropertyName, questionToken: QuestionToken | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, body: Block | undefined): MethodDeclaration;
-    function updateMethod(node: MethodDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, asteriskToken: AsteriskToken | undefined, name: PropertyName, questionToken: QuestionToken | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, body: Block | undefined): MethodDeclaration;
-    function createConstructor(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, body: Block | undefined): ConstructorDeclaration;
-    function updateConstructor(node: ConstructorDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, body: Block | undefined): ConstructorDeclaration;
-    function createGetAccessor(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | PropertyName, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, body: Block | undefined): GetAccessorDeclaration;
-    function updateGetAccessor(node: GetAccessorDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: PropertyName, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, body: Block | undefined): GetAccessorDeclaration;
-    function createSetAccessor(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | PropertyName, parameters: ReadonlyArray<ParameterDeclaration>, body: Block | undefined): SetAccessorDeclaration;
-    function updateSetAccessor(node: SetAccessorDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: PropertyName, parameters: ReadonlyArray<ParameterDeclaration>, body: Block | undefined): SetAccessorDeclaration;
-    function createCallSignature(typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined): CallSignatureDeclaration;
-    function updateCallSignature(node: CallSignatureDeclaration, typeParameters: NodeArray<TypeParameterDeclaration> | undefined, parameters: NodeArray<ParameterDeclaration>, type: TypeNode | undefined): CallSignatureDeclaration;
-    function createConstructSignature(typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined): ConstructSignatureDeclaration;
-    function updateConstructSignature(node: ConstructSignatureDeclaration, typeParameters: NodeArray<TypeParameterDeclaration> | undefined, parameters: NodeArray<ParameterDeclaration>, type: TypeNode | undefined): ConstructSignatureDeclaration;
-    function createIndexSignature(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode): IndexSignatureDeclaration;
-    function updateIndexSignature(node: IndexSignatureDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode): IndexSignatureDeclaration;
-    function createKeywordTypeNode(kind: KeywordTypeNode["kind"]): KeywordTypeNode;
-    function createTypePredicateNode(parameterName: Identifier | ThisTypeNode | string, type: TypeNode): TypePredicateNode;
-    function updateTypePredicateNode(node: TypePredicateNode, parameterName: Identifier | ThisTypeNode, type: TypeNode): TypePredicateNode;
-    function createTypeReferenceNode(typeName: string | EntityName, typeArguments: ReadonlyArray<TypeNode> | undefined): TypeReferenceNode;
-    function updateTypeReferenceNode(node: TypeReferenceNode, typeName: EntityName, typeArguments: NodeArray<TypeNode> | undefined): TypeReferenceNode;
-    function createFunctionTypeNode(typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined): FunctionTypeNode;
-    function updateFunctionTypeNode(node: FunctionTypeNode, typeParameters: NodeArray<TypeParameterDeclaration> | undefined, parameters: NodeArray<ParameterDeclaration>, type: TypeNode | undefined): FunctionTypeNode;
-    function createConstructorTypeNode(typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined): ConstructorTypeNode;
-    function updateConstructorTypeNode(node: ConstructorTypeNode, typeParameters: NodeArray<TypeParameterDeclaration> | undefined, parameters: NodeArray<ParameterDeclaration>, type: TypeNode | undefined): ConstructorTypeNode;
-    function createTypeQueryNode(exprName: EntityName): TypeQueryNode;
-    function updateTypeQueryNode(node: TypeQueryNode, exprName: EntityName): TypeQueryNode;
-    function createTypeLiteralNode(members: ReadonlyArray<TypeElement> | undefined): TypeLiteralNode;
-    function updateTypeLiteralNode(node: TypeLiteralNode, members: NodeArray<TypeElement>): TypeLiteralNode;
-    function createArrayTypeNode(elementType: TypeNode): ArrayTypeNode;
-    function updateArrayTypeNode(node: ArrayTypeNode, elementType: TypeNode): ArrayTypeNode;
-    function createTupleTypeNode(elementTypes: ReadonlyArray<TypeNode>): TupleTypeNode;
-    function updateTypleTypeNode(node: TupleTypeNode, elementTypes: ReadonlyArray<TypeNode>): TupleTypeNode;
-    function createUnionTypeNode(types: ReadonlyArray<TypeNode>): UnionTypeNode;
-    function updateUnionTypeNode(node: UnionTypeNode, types: NodeArray<TypeNode>): UnionTypeNode;
-    function createIntersectionTypeNode(types: ReadonlyArray<TypeNode>): IntersectionTypeNode;
-    function updateIntersectionTypeNode(node: IntersectionTypeNode, types: NodeArray<TypeNode>): IntersectionTypeNode;
-    function createUnionOrIntersectionTypeNode(kind: SyntaxKind.UnionType | SyntaxKind.IntersectionType, types: ReadonlyArray<TypeNode>): UnionOrIntersectionTypeNode;
-    function createConditionalTypeNode(checkType: TypeNode, extendsType: TypeNode, trueType: TypeNode, falseType: TypeNode): ConditionalTypeNode;
-    function updateConditionalTypeNode(node: ConditionalTypeNode, checkType: TypeNode, extendsType: TypeNode, trueType: TypeNode, falseType: TypeNode): ConditionalTypeNode;
-    function createInferTypeNode(typeParameter: TypeParameterDeclaration): InferTypeNode;
-    function updateInferTypeNode(node: InferTypeNode, typeParameter: TypeParameterDeclaration): InferTypeNode;
-    function createImportTypeNode(argument: TypeNode, qualifier?: EntityName, typeArguments?: ReadonlyArray<TypeNode>, isTypeOf?: boolean): ImportTypeNode;
-    function updateImportTypeNode(node: ImportTypeNode, argument: TypeNode, qualifier?: EntityName, typeArguments?: ReadonlyArray<TypeNode>, isTypeOf?: boolean): ImportTypeNode;
-    function createParenthesizedType(type: TypeNode): ParenthesizedTypeNode;
-    function updateParenthesizedType(node: ParenthesizedTypeNode, type: TypeNode): ParenthesizedTypeNode;
-    function createThisTypeNode(): ThisTypeNode;
-    function createTypeOperatorNode(type: TypeNode): TypeOperatorNode;
-    function createTypeOperatorNode(operator: SyntaxKind.KeyOfKeyword | SyntaxKind.UniqueKeyword, type: TypeNode): TypeOperatorNode;
-    function updateTypeOperatorNode(node: TypeOperatorNode, type: TypeNode): TypeOperatorNode;
-    function createIndexedAccessTypeNode(objectType: TypeNode, indexType: TypeNode): IndexedAccessTypeNode;
-    function updateIndexedAccessTypeNode(node: IndexedAccessTypeNode, objectType: TypeNode, indexType: TypeNode): IndexedAccessTypeNode;
-    function createMappedTypeNode(readonlyToken: ReadonlyToken | PlusToken | MinusToken | undefined, typeParameter: TypeParameterDeclaration, questionToken: QuestionToken | PlusToken | MinusToken | undefined, type: TypeNode | undefined): MappedTypeNode;
-    function updateMappedTypeNode(node: MappedTypeNode, readonlyToken: ReadonlyToken | PlusToken | MinusToken | undefined, typeParameter: TypeParameterDeclaration, questionToken: QuestionToken | PlusToken | MinusToken | undefined, type: TypeNode | undefined): MappedTypeNode;
-    function createLiteralTypeNode(literal: LiteralTypeNode["literal"]): LiteralTypeNode;
-    function updateLiteralTypeNode(node: LiteralTypeNode, literal: LiteralTypeNode["literal"]): LiteralTypeNode;
-    function createObjectBindingPattern(elements: ReadonlyArray<BindingElement>): ObjectBindingPattern;
-    function updateObjectBindingPattern(node: ObjectBindingPattern, elements: ReadonlyArray<BindingElement>): ObjectBindingPattern;
-    function createArrayBindingPattern(elements: ReadonlyArray<ArrayBindingElement>): ArrayBindingPattern;
-    function updateArrayBindingPattern(node: ArrayBindingPattern, elements: ReadonlyArray<ArrayBindingElement>): ArrayBindingPattern;
-    function createBindingElement(dotDotDotToken: DotDotDotToken | undefined, propertyName: string | PropertyName | undefined, name: string | BindingName, initializer?: Expression): BindingElement;
-    function updateBindingElement(node: BindingElement, dotDotDotToken: DotDotDotToken | undefined, propertyName: PropertyName | undefined, name: BindingName, initializer: Expression | undefined): BindingElement;
-    function createArrayLiteral(elements?: ReadonlyArray<Expression>, multiLine?: boolean): ArrayLiteralExpression;
-    function updateArrayLiteral(node: ArrayLiteralExpression, elements: ReadonlyArray<Expression>): ArrayLiteralExpression;
-    function createObjectLiteral(properties?: ReadonlyArray<ObjectLiteralElementLike>, multiLine?: boolean): ObjectLiteralExpression;
-    function updateObjectLiteral(node: ObjectLiteralExpression, properties: ReadonlyArray<ObjectLiteralElementLike>): ObjectLiteralExpression;
-    function createPropertyAccess(expression: Expression, name: string | Identifier | undefined): PropertyAccessExpression;
-    function updatePropertyAccess(node: PropertyAccessExpression, expression: Expression, name: Identifier): PropertyAccessExpression;
-    function createElementAccess(expression: Expression, index: number | Expression): ElementAccessExpression;
-    function updateElementAccess(node: ElementAccessExpression, expression: Expression, argumentExpression: Expression): ElementAccessExpression;
-    function createCall(expression: Expression, typeArguments: ReadonlyArray<TypeNode> | undefined, argumentsArray: ReadonlyArray<Expression> | undefined): CallExpression;
-    function updateCall(node: CallExpression, expression: Expression, typeArguments: ReadonlyArray<TypeNode> | undefined, argumentsArray: ReadonlyArray<Expression>): CallExpression;
-    function createNew(expression: Expression, typeArguments: ReadonlyArray<TypeNode> | undefined, argumentsArray: ReadonlyArray<Expression> | undefined): NewExpression;
-    function updateNew(node: NewExpression, expression: Expression, typeArguments: ReadonlyArray<TypeNode> | undefined, argumentsArray: ReadonlyArray<Expression> | undefined): NewExpression;
-    function createTaggedTemplate(tag: Expression, template: TemplateLiteral): TaggedTemplateExpression;
-    function createTaggedTemplate(tag: Expression, typeArguments: ReadonlyArray<TypeNode> | undefined, template: TemplateLiteral): TaggedTemplateExpression;
-    function updateTaggedTemplate(node: TaggedTemplateExpression, tag: Expression, template: TemplateLiteral): TaggedTemplateExpression;
-    function updateTaggedTemplate(node: TaggedTemplateExpression, tag: Expression, typeArguments: ReadonlyArray<TypeNode> | undefined, template: TemplateLiteral): TaggedTemplateExpression;
-    function createTypeAssertion(type: TypeNode, expression: Expression): TypeAssertion;
-    function updateTypeAssertion(node: TypeAssertion, type: TypeNode, expression: Expression): TypeAssertion;
-    function createParen(expression: Expression): ParenthesizedExpression;
-    function updateParen(node: ParenthesizedExpression, expression: Expression): ParenthesizedExpression;
-    function createFunctionExpression(modifiers: ReadonlyArray<Modifier> | undefined, asteriskToken: AsteriskToken | undefined, name: string | Identifier | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration> | undefined, type: TypeNode | undefined, body: Block): FunctionExpression;
-    function updateFunctionExpression(node: FunctionExpression, modifiers: ReadonlyArray<Modifier> | undefined, asteriskToken: AsteriskToken | undefined, name: Identifier | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, body: Block): FunctionExpression;
-    function createArrowFunction(modifiers: ReadonlyArray<Modifier> | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, equalsGreaterThanToken: EqualsGreaterThanToken | undefined, body: ConciseBody): ArrowFunction;
-    function updateArrowFunction(node: ArrowFunction, modifiers: ReadonlyArray<Modifier> | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, body: ConciseBody): ArrowFunction;
-    function updateArrowFunction(node: ArrowFunction, modifiers: ReadonlyArray<Modifier> | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, equalsGreaterThanToken: Token<SyntaxKind.EqualsGreaterThanToken>, body: ConciseBody): ArrowFunction;
-    function createDelete(expression: Expression): DeleteExpression;
-    function updateDelete(node: DeleteExpression, expression: Expression): DeleteExpression;
-    function createTypeOf(expression: Expression): TypeOfExpression;
-    function updateTypeOf(node: TypeOfExpression, expression: Expression): TypeOfExpression;
-    function createVoid(expression: Expression): VoidExpression;
-    function updateVoid(node: VoidExpression, expression: Expression): VoidExpression;
-    function createAwait(expression: Expression): AwaitExpression;
-    function updateAwait(node: AwaitExpression, expression: Expression): AwaitExpression;
-    function createPrefix(operator: PrefixUnaryOperator, operand: Expression): PrefixUnaryExpression;
-    function updatePrefix(node: PrefixUnaryExpression, operand: Expression): PrefixUnaryExpression;
-    function createPostfix(operand: Expression, operator: PostfixUnaryOperator): PostfixUnaryExpression;
-    function updatePostfix(node: PostfixUnaryExpression, operand: Expression): PostfixUnaryExpression;
-    function createBinary(left: Expression, operator: BinaryOperator | BinaryOperatorToken, right: Expression): BinaryExpression;
-    function updateBinary(node: BinaryExpression, left: Expression, right: Expression, operator?: BinaryOperator | BinaryOperatorToken): BinaryExpression;
-    function createConditional(condition: Expression, whenTrue: Expression, whenFalse: Expression): ConditionalExpression;
-    function createConditional(condition: Expression, questionToken: QuestionToken, whenTrue: Expression, colonToken: ColonToken, whenFalse: Expression): ConditionalExpression;
-    function updateConditional(node: ConditionalExpression, condition: Expression, whenTrue: Expression, whenFalse: Expression): ConditionalExpression;
-    function updateConditional(node: ConditionalExpression, condition: Expression, questionToken: Token<SyntaxKind.QuestionToken>, whenTrue: Expression, colonToken: Token<SyntaxKind.ColonToken>, whenFalse: Expression): ConditionalExpression;
-    function createTemplateExpression(head: TemplateHead, templateSpans: ReadonlyArray<TemplateSpan>): TemplateExpression;
-    function updateTemplateExpression(node: TemplateExpression, head: TemplateHead, templateSpans: ReadonlyArray<TemplateSpan>): TemplateExpression;
-    function createTemplateHead(text: string): TemplateHead;
-    function createTemplateMiddle(text: string): TemplateMiddle;
-    function createTemplateTail(text: string): TemplateTail;
-    function createNoSubstitutionTemplateLiteral(text: string): NoSubstitutionTemplateLiteral;
-    function createYield(expression?: Expression): YieldExpression;
-    function createYield(asteriskToken: AsteriskToken | undefined, expression: Expression): YieldExpression;
-    function updateYield(node: YieldExpression, asteriskToken: AsteriskToken | undefined, expression: Expression): YieldExpression;
-    function createSpread(expression: Expression): SpreadElement;
-    function updateSpread(node: SpreadElement, expression: Expression): SpreadElement;
-    function createClassExpression(modifiers: ReadonlyArray<Modifier> | undefined, name: string | Identifier | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, heritageClauses: ReadonlyArray<HeritageClause> | undefined, members: ReadonlyArray<ClassElement>): ClassExpression;
-    function updateClassExpression(node: ClassExpression, modifiers: ReadonlyArray<Modifier> | undefined, name: Identifier | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, heritageClauses: ReadonlyArray<HeritageClause> | undefined, members: ReadonlyArray<ClassElement>): ClassExpression;
-    function createOmittedExpression(): OmittedExpression;
-    function createExpressionWithTypeArguments(typeArguments: ReadonlyArray<TypeNode> | undefined, expression: Expression): ExpressionWithTypeArguments;
-    function updateExpressionWithTypeArguments(node: ExpressionWithTypeArguments, typeArguments: ReadonlyArray<TypeNode> | undefined, expression: Expression): ExpressionWithTypeArguments;
-    function createAsExpression(expression: Expression, type: TypeNode): AsExpression;
-    function updateAsExpression(node: AsExpression, expression: Expression, type: TypeNode): AsExpression;
-    function createNonNullExpression(expression: Expression): NonNullExpression;
-    function updateNonNullExpression(node: NonNullExpression, expression: Expression): NonNullExpression;
-    function createMetaProperty(keywordToken: MetaProperty["keywordToken"], name: Identifier): MetaProperty;
-    function updateMetaProperty(node: MetaProperty, name: Identifier): MetaProperty;
-    function createTemplateSpan(expression: Expression, literal: TemplateMiddle | TemplateTail): TemplateSpan;
-    function updateTemplateSpan(node: TemplateSpan, expression: Expression, literal: TemplateMiddle | TemplateTail): TemplateSpan;
-    function createSemicolonClassElement(): SemicolonClassElement;
-    function createBlock(statements: ReadonlyArray<Statement>, multiLine?: boolean): Block;
-    function updateBlock(node: Block, statements: ReadonlyArray<Statement>): Block;
-    function createVariableStatement(modifiers: ReadonlyArray<Modifier> | undefined, declarationList: VariableDeclarationList | ReadonlyArray<VariableDeclaration>): VariableStatement;
-    function updateVariableStatement(node: VariableStatement, modifiers: ReadonlyArray<Modifier> | undefined, declarationList: VariableDeclarationList): VariableStatement;
-    function createEmptyStatement(): EmptyStatement;
-    function createStatement(expression: Expression): ExpressionStatement;
-    function updateStatement(node: ExpressionStatement, expression: Expression): ExpressionStatement;
-    function createIf(expression: Expression, thenStatement: Statement, elseStatement?: Statement): IfStatement;
-    function updateIf(node: IfStatement, expression: Expression, thenStatement: Statement, elseStatement: Statement | undefined): IfStatement;
-    function createDo(statement: Statement, expression: Expression): DoStatement;
-    function updateDo(node: DoStatement, statement: Statement, expression: Expression): DoStatement;
-    function createWhile(expression: Expression, statement: Statement): WhileStatement;
-    function updateWhile(node: WhileStatement, expression: Expression, statement: Statement): WhileStatement;
-    function createFor(initializer: ForInitializer | undefined, condition: Expression | undefined, incrementor: Expression | undefined, statement: Statement): ForStatement;
-    function updateFor(node: ForStatement, initializer: ForInitializer | undefined, condition: Expression | undefined, incrementor: Expression | undefined, statement: Statement): ForStatement;
-    function createForIn(initializer: ForInitializer, expression: Expression, statement: Statement): ForInStatement;
-    function updateForIn(node: ForInStatement, initializer: ForInitializer, expression: Expression, statement: Statement): ForInStatement;
-    function createForOf(awaitModifier: AwaitKeywordToken | undefined, initializer: ForInitializer, expression: Expression, statement: Statement): ForOfStatement;
-    function updateForOf(node: ForOfStatement, awaitModifier: AwaitKeywordToken | undefined, initializer: ForInitializer, expression: Expression, statement: Statement): ForOfStatement;
-    function createContinue(label?: string | Identifier): ContinueStatement;
-    function updateContinue(node: ContinueStatement, label: Identifier | undefined): ContinueStatement;
-    function createBreak(label?: string | Identifier): BreakStatement;
-    function updateBreak(node: BreakStatement, label: Identifier | undefined): BreakStatement;
-    function createReturn(expression?: Expression): ReturnStatement;
-    function updateReturn(node: ReturnStatement, expression: Expression | undefined): ReturnStatement;
-    function createWith(expression: Expression, statement: Statement): WithStatement;
-    function updateWith(node: WithStatement, expression: Expression, statement: Statement): WithStatement;
-    function createSwitch(expression: Expression, caseBlock: CaseBlock): SwitchStatement;
-    function updateSwitch(node: SwitchStatement, expression: Expression, caseBlock: CaseBlock): SwitchStatement;
-    function createLabel(label: string | Identifier, statement: Statement): LabeledStatement;
-    function updateLabel(node: LabeledStatement, label: Identifier, statement: Statement): LabeledStatement;
-    function createThrow(expression: Expression): ThrowStatement;
-    function updateThrow(node: ThrowStatement, expression: Expression): ThrowStatement;
-    function createTry(tryBlock: Block, catchClause: CatchClause | undefined, finallyBlock: Block | undefined): TryStatement;
-    function updateTry(node: TryStatement, tryBlock: Block, catchClause: CatchClause | undefined, finallyBlock: Block | undefined): TryStatement;
-    function createDebuggerStatement(): DebuggerStatement;
-    function createVariableDeclaration(name: string | BindingName, type?: TypeNode, initializer?: Expression): VariableDeclaration;
-    function updateVariableDeclaration(node: VariableDeclaration, name: BindingName, type: TypeNode | undefined, initializer: Expression | undefined): VariableDeclaration;
-    function createVariableDeclarationList(declarations: ReadonlyArray<VariableDeclaration>, flags?: NodeFlags): VariableDeclarationList;
-    function updateVariableDeclarationList(node: VariableDeclarationList, declarations: ReadonlyArray<VariableDeclaration>): VariableDeclarationList;
-    function createFunctionDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, asteriskToken: AsteriskToken | undefined, name: string | Identifier | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, body: Block | undefined): FunctionDeclaration;
-    function updateFunctionDeclaration(node: FunctionDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, asteriskToken: AsteriskToken | undefined, name: Identifier | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, body: Block | undefined): FunctionDeclaration;
-    function createClassDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | Identifier | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, heritageClauses: ReadonlyArray<HeritageClause> | undefined, members: ReadonlyArray<ClassElement>): ClassDeclaration;
-    function updateClassDeclaration(node: ClassDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: Identifier | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, heritageClauses: ReadonlyArray<HeritageClause> | undefined, members: ReadonlyArray<ClassElement>): ClassDeclaration;
-    function createInterfaceDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | Identifier, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, heritageClauses: ReadonlyArray<HeritageClause> | undefined, members: ReadonlyArray<TypeElement>): InterfaceDeclaration;
-    function updateInterfaceDeclaration(node: InterfaceDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: Identifier, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, heritageClauses: ReadonlyArray<HeritageClause> | undefined, members: ReadonlyArray<TypeElement>): InterfaceDeclaration;
-    function createTypeAliasDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | Identifier, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, type: TypeNode): TypeAliasDeclaration;
-    function updateTypeAliasDeclaration(node: TypeAliasDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: Identifier, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, type: TypeNode): TypeAliasDeclaration;
-    function createEnumDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | Identifier, members: ReadonlyArray<EnumMember>): EnumDeclaration;
-    function updateEnumDeclaration(node: EnumDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: Identifier, members: ReadonlyArray<EnumMember>): EnumDeclaration;
-    function createModuleDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: ModuleName, body: ModuleBody | undefined, flags?: NodeFlags): ModuleDeclaration;
-    function updateModuleDeclaration(node: ModuleDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: ModuleName, body: ModuleBody | undefined): ModuleDeclaration;
-    function createModuleBlock(statements: ReadonlyArray<Statement>): ModuleBlock;
-    function updateModuleBlock(node: ModuleBlock, statements: ReadonlyArray<Statement>): ModuleBlock;
-    function createCaseBlock(clauses: ReadonlyArray<CaseOrDefaultClause>): CaseBlock;
-    function updateCaseBlock(node: CaseBlock, clauses: ReadonlyArray<CaseOrDefaultClause>): CaseBlock;
-    function createNamespaceExportDeclaration(name: string | Identifier): NamespaceExportDeclaration;
-    function updateNamespaceExportDeclaration(node: NamespaceExportDeclaration, name: Identifier): NamespaceExportDeclaration;
-    function createImportEqualsDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | Identifier, moduleReference: ModuleReference): ImportEqualsDeclaration;
-    function updateImportEqualsDeclaration(node: ImportEqualsDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: Identifier, moduleReference: ModuleReference): ImportEqualsDeclaration;
-    function createImportDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, importClause: ImportClause | undefined, moduleSpecifier: Expression): ImportDeclaration;
-    function updateImportDeclaration(node: ImportDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, importClause: ImportClause | undefined, moduleSpecifier: Expression): ImportDeclaration;
-    function createImportClause(name: Identifier | undefined, namedBindings: NamedImportBindings | undefined): ImportClause;
-    function updateImportClause(node: ImportClause, name: Identifier | undefined, namedBindings: NamedImportBindings | undefined): ImportClause;
-    function createNamespaceImport(name: Identifier): NamespaceImport;
-    function updateNamespaceImport(node: NamespaceImport, name: Identifier): NamespaceImport;
-    function createNamedImports(elements: ReadonlyArray<ImportSpecifier>): NamedImports;
-    function updateNamedImports(node: NamedImports, elements: ReadonlyArray<ImportSpecifier>): NamedImports;
-    function createImportSpecifier(propertyName: Identifier | undefined, name: Identifier): ImportSpecifier;
-    function updateImportSpecifier(node: ImportSpecifier, propertyName: Identifier | undefined, name: Identifier): ImportSpecifier;
-    function createExportAssignment(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, isExportEquals: boolean | undefined, expression: Expression): ExportAssignment;
-    function updateExportAssignment(node: ExportAssignment, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, expression: Expression): ExportAssignment;
-    function createExportDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, exportClause: NamedExports | undefined, moduleSpecifier?: Expression): ExportDeclaration;
-    function updateExportDeclaration(node: ExportDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, exportClause: NamedExports | undefined, moduleSpecifier: Expression | undefined): ExportDeclaration;
-    function createNamedExports(elements: ReadonlyArray<ExportSpecifier>): NamedExports;
-    function updateNamedExports(node: NamedExports, elements: ReadonlyArray<ExportSpecifier>): NamedExports;
-    function createExportSpecifier(propertyName: string | Identifier | undefined, name: string | Identifier): ExportSpecifier;
-    function updateExportSpecifier(node: ExportSpecifier, propertyName: Identifier | undefined, name: Identifier): ExportSpecifier;
-    function createExternalModuleReference(expression: Expression): ExternalModuleReference;
-    function updateExternalModuleReference(node: ExternalModuleReference, expression: Expression): ExternalModuleReference;
-    function createJsxElement(openingElement: JsxOpeningElement, children: ReadonlyArray<JsxChild>, closingElement: JsxClosingElement): JsxElement;
-    function updateJsxElement(node: JsxElement, openingElement: JsxOpeningElement, children: ReadonlyArray<JsxChild>, closingElement: JsxClosingElement): JsxElement;
-    function createJsxSelfClosingElement(tagName: JsxTagNameExpression, typeArguments: ReadonlyArray<TypeNode> | undefined, attributes: JsxAttributes): JsxSelfClosingElement;
-    function updateJsxSelfClosingElement(node: JsxSelfClosingElement, tagName: JsxTagNameExpression, typeArguments: ReadonlyArray<TypeNode> | undefined, attributes: JsxAttributes): JsxSelfClosingElement;
-    function createJsxOpeningElement(tagName: JsxTagNameExpression, typeArguments: ReadonlyArray<TypeNode> | undefined, attributes: JsxAttributes): JsxOpeningElement;
-    function updateJsxOpeningElement(node: JsxOpeningElement, tagName: JsxTagNameExpression, typeArguments: ReadonlyArray<TypeNode> | undefined, attributes: JsxAttributes): JsxOpeningElement;
-    function createJsxClosingElement(tagName: JsxTagNameExpression): JsxClosingElement;
-    function updateJsxClosingElement(node: JsxClosingElement, tagName: JsxTagNameExpression): JsxClosingElement;
-    function createJsxFragment(openingFragment: JsxOpeningFragment, children: ReadonlyArray<JsxChild>, closingFragment: JsxClosingFragment): JsxFragment;
-    function updateJsxFragment(node: JsxFragment, openingFragment: JsxOpeningFragment, children: ReadonlyArray<JsxChild>, closingFragment: JsxClosingFragment): JsxFragment;
-    function createJsxAttribute(name: Identifier, initializer: StringLiteral | JsxExpression): JsxAttribute;
-    function updateJsxAttribute(node: JsxAttribute, name: Identifier, initializer: StringLiteral | JsxExpression): JsxAttribute;
-    function createJsxAttributes(properties: ReadonlyArray<JsxAttributeLike>): JsxAttributes;
-    function updateJsxAttributes(node: JsxAttributes, properties: ReadonlyArray<JsxAttributeLike>): JsxAttributes;
-    function createJsxSpreadAttribute(expression: Expression): JsxSpreadAttribute;
-    function updateJsxSpreadAttribute(node: JsxSpreadAttribute, expression: Expression): JsxSpreadAttribute;
-    function createJsxExpression(dotDotDotToken: DotDotDotToken | undefined, expression: Expression | undefined): JsxExpression;
-    function updateJsxExpression(node: JsxExpression, expression: Expression | undefined): JsxExpression;
-    function createCaseClause(expression: Expression, statements: ReadonlyArray<Statement>): CaseClause;
-    function updateCaseClause(node: CaseClause, expression: Expression, statements: ReadonlyArray<Statement>): CaseClause;
-    function createDefaultClause(statements: ReadonlyArray<Statement>): DefaultClause;
-    function updateDefaultClause(node: DefaultClause, statements: ReadonlyArray<Statement>): DefaultClause;
-    function createHeritageClause(token: HeritageClause["token"], types: ReadonlyArray<ExpressionWithTypeArguments>): HeritageClause;
-    function updateHeritageClause(node: HeritageClause, types: ReadonlyArray<ExpressionWithTypeArguments>): HeritageClause;
-    function createCatchClause(variableDeclaration: string | VariableDeclaration | undefined, block: Block): CatchClause;
-    function updateCatchClause(node: CatchClause, variableDeclaration: VariableDeclaration | undefined, block: Block): CatchClause;
-    function createPropertyAssignment(name: string | PropertyName, initializer: Expression): PropertyAssignment;
-    function updatePropertyAssignment(node: PropertyAssignment, name: PropertyName, initializer: Expression): PropertyAssignment;
-    function createShorthandPropertyAssignment(name: string | Identifier, objectAssignmentInitializer?: Expression): ShorthandPropertyAssignment;
-    function updateShorthandPropertyAssignment(node: ShorthandPropertyAssignment, name: Identifier, objectAssignmentInitializer: Expression | undefined): ShorthandPropertyAssignment;
-    function createSpreadAssignment(expression: Expression): SpreadAssignment;
-    function updateSpreadAssignment(node: SpreadAssignment, expression: Expression): SpreadAssignment;
-    function createEnumMember(name: string | PropertyName, initializer?: Expression): EnumMember;
-    function updateEnumMember(node: EnumMember, name: PropertyName, initializer: Expression | undefined): EnumMember;
-    function updateSourceFileNode(node: SourceFile, statements: ReadonlyArray<Statement>, isDeclarationFile?: boolean, referencedFiles?: SourceFile["referencedFiles"], typeReferences?: SourceFile["typeReferenceDirectives"], hasNoDefaultLib?: boolean, libReferences?: SourceFile["libReferenceDirectives"]): SourceFile;
-    /**
-     * Creates a shallow, memberwise clone of a node for mutation.
-     */
-    function getMutableClone<T extends Node>(node: T): T;
-    /**
-     * Creates a synthetic statement to act as a placeholder for a not-emitted statement in
-     * order to preserve comments.
-     *
-     * @param original The original statement.
-     */
-    function createNotEmittedStatement(original: Node): NotEmittedStatement;
-    /**
-     * Creates a synthetic expression to act as a placeholder for a not-emitted expression in
-     * order to preserve comments or sourcemap positions.
-     *
-     * @param expression The inner expression to emit.
-     * @param original The original outer expression.
-     * @param location The location for the expression. Defaults to the positions from "original" if provided.
-     */
-    function createPartiallyEmittedExpression(expression: Expression, original?: Node): PartiallyEmittedExpression;
-    function updatePartiallyEmittedExpression(node: PartiallyEmittedExpression, expression: Expression): PartiallyEmittedExpression;
-    function createCommaList(elements: ReadonlyArray<Expression>): CommaListExpression;
-    function updateCommaList(node: CommaListExpression, elements: ReadonlyArray<Expression>): CommaListExpression;
-    function createBundle(sourceFiles: ReadonlyArray<SourceFile>, prepends?: ReadonlyArray<UnparsedSource | InputFiles>): Bundle;
-    function createUnparsedSourceFile(text: string, map?: string): UnparsedSource;
-    function createInputFiles(javascript: string, declaration: string, javascriptMapText?: string, declarationMapText?: string): InputFiles;
-    function updateBundle(node: Bundle, sourceFiles: ReadonlyArray<SourceFile>, prepends?: ReadonlyArray<UnparsedSource>): Bundle;
-    function createImmediatelyInvokedFunctionExpression(statements: ReadonlyArray<Statement>): CallExpression;
-    function createImmediatelyInvokedFunctionExpression(statements: ReadonlyArray<Statement>, param: ParameterDeclaration, paramValue: Expression): CallExpression;
-    function createImmediatelyInvokedArrowFunction(statements: ReadonlyArray<Statement>): CallExpression;
-    function createImmediatelyInvokedArrowFunction(statements: ReadonlyArray<Statement>, param: ParameterDeclaration, paramValue: Expression): CallExpression;
-    function createComma(left: Expression, right: Expression): Expression;
-    function createLessThan(left: Expression, right: Expression): Expression;
-    function createAssignment(left: ObjectLiteralExpression | ArrayLiteralExpression, right: Expression): DestructuringAssignment;
-    function createAssignment(left: Expression, right: Expression): BinaryExpression;
-    function createStrictEquality(left: Expression, right: Expression): BinaryExpression;
-    function createStrictInequality(left: Expression, right: Expression): BinaryExpression;
-    function createAdd(left: Expression, right: Expression): BinaryExpression;
-    function createSubtract(left: Expression, right: Expression): BinaryExpression;
-    function createPostfixIncrement(operand: Expression): PostfixUnaryExpression;
-    function createLogicalAnd(left: Expression, right: Expression): BinaryExpression;
-    function createLogicalOr(left: Expression, right: Expression): BinaryExpression;
-    function createLogicalNot(operand: Expression): PrefixUnaryExpression;
-    function createVoidZero(): VoidExpression;
-    function createExportDefault(expression: Expression): ExportAssignment;
-    function createExternalModuleExport(exportName: Identifier): ExportDeclaration;
-    /**
-     * Clears any EmitNode entries from parse-tree nodes.
-     * @param sourceFile A source file.
-     */
-    function disposeEmitNodes(sourceFile: SourceFile): void;
-    function setTextRange<T extends TextRange>(range: T, location: TextRange | undefined): T;
-    /**
-     * Sets flags that control emit behavior of a node.
-     */
-    function setEmitFlags<T extends Node>(node: T, emitFlags: EmitFlags): T;
-    /**
-     * Gets a custom text range to use when emitting source maps.
-     */
-    function getSourceMapRange(node: Node): SourceMapRange;
-    /**
-     * Sets a custom text range to use when emitting source maps.
-     */
-    function setSourceMapRange<T extends Node>(node: T, range: SourceMapRange | undefined): T;
-    /**
-     * Create an external source map source file reference
-     */
-    function createSourceMapSource(fileName: string, text: string, skipTrivia?: (pos: number) => number): SourceMapSource;
-    /**
-     * Gets the TextRange to use for source maps for a token of a node.
-     */
-    function getTokenSourceMapRange(node: Node, token: SyntaxKind): SourceMapRange | undefined;
-    /**
-     * Sets the TextRange to use for source maps for a token of a node.
-     */
-    function setTokenSourceMapRange<T extends Node>(node: T, token: SyntaxKind, range: SourceMapRange | undefined): T;
-    /**
-     * Gets a custom text range to use when emitting comments.
-     */
-    function getCommentRange(node: Node): TextRange;
-    /**
-     * Sets a custom text range to use when emitting comments.
-     */
-    function setCommentRange<T extends Node>(node: T, range: TextRange): T;
-    function getSyntheticLeadingComments(node: Node): SynthesizedComment[] | undefined;
-    function setSyntheticLeadingComments<T extends Node>(node: T, comments: SynthesizedComment[] | undefined): T;
-    function addSyntheticLeadingComment<T extends Node>(node: T, kind: SyntaxKind.SingleLineCommentTrivia | SyntaxKind.MultiLineCommentTrivia, text: string, hasTrailingNewLine?: boolean): T;
-    function getSyntheticTrailingComments(node: Node): SynthesizedComment[] | undefined;
-    function setSyntheticTrailingComments<T extends Node>(node: T, comments: SynthesizedComment[] | undefined): T;
-    function addSyntheticTrailingComment<T extends Node>(node: T, kind: SyntaxKind.SingleLineCommentTrivia | SyntaxKind.MultiLineCommentTrivia, text: string, hasTrailingNewLine?: boolean): T;
-    function moveSyntheticComments<T extends Node>(node: T, original: Node): T;
-    /**
-     * Gets the constant value to emit for an expression.
-     */
-    function getConstantValue(node: PropertyAccessExpression | ElementAccessExpression): string | number | undefined;
-    /**
-     * Sets the constant value to emit for an expression.
-     */
-    function setConstantValue(node: PropertyAccessExpression | ElementAccessExpression, value: string | number): PropertyAccessExpression | ElementAccessExpression;
-    /**
-     * Adds an EmitHelper to a node.
-     */
-    function addEmitHelper<T extends Node>(node: T, helper: EmitHelper): T;
-    /**
-     * Add EmitHelpers to a node.
-     */
-    function addEmitHelpers<T extends Node>(node: T, helpers: EmitHelper[] | undefined): T;
-    /**
-     * Removes an EmitHelper from a node.
-     */
-    function removeEmitHelper(node: Node, helper: EmitHelper): boolean;
-    /**
-     * Gets the EmitHelpers of a node.
-     */
-    function getEmitHelpers(node: Node): EmitHelper[] | undefined;
-    /**
-     * Moves matching emit helpers from a source node to a target node.
-     */
-    function moveEmitHelpers(source: Node, target: Node, predicate: (helper: EmitHelper) => boolean): void;
-    function setOriginalNode<T extends Node>(node: T, original: Node | undefined): T;
-}
-declare namespace ts {
-    /**
-     * Visits a Node using the supplied visitor, possibly returning a new Node in its place.
-     *
-     * @param node The Node to visit.
-     * @param visitor The callback used to visit the Node.
-     * @param test A callback to execute to verify the Node is valid.
-     * @param lift An optional callback to execute to lift a NodeArray into a valid Node.
-     */
-    function visitNode<T extends Node>(node: T | undefined, visitor: Visitor | undefined, test?: (node: Node) => boolean, lift?: (node: NodeArray<Node>) => T): T;
-    /**
-     * Visits a Node using the supplied visitor, possibly returning a new Node in its place.
-     *
-     * @param node The Node to visit.
-     * @param visitor The callback used to visit the Node.
-     * @param test A callback to execute to verify the Node is valid.
-     * @param lift An optional callback to execute to lift a NodeArray into a valid Node.
-     */
-    function visitNode<T extends Node>(node: T | undefined, visitor: Visitor | undefined, test?: (node: Node) => boolean, lift?: (node: NodeArray<Node>) => T): T | undefined;
-    /**
-     * Visits a NodeArray using the supplied visitor, possibly returning a new NodeArray in its place.
-     *
-     * @param nodes The NodeArray to visit.
-     * @param visitor The callback used to visit a Node.
-     * @param test A node test to execute for each node.
-     * @param start An optional value indicating the starting offset at which to start visiting.
-     * @param count An optional value indicating the maximum number of nodes to visit.
-     */
-    function visitNodes<T extends Node>(nodes: NodeArray<T> | undefined, visitor: Visitor, test?: (node: Node) => boolean, start?: number, count?: number): NodeArray<T>;
-    /**
-     * Visits a NodeArray using the supplied visitor, possibly returning a new NodeArray in its place.
-     *
-     * @param nodes The NodeArray to visit.
-     * @param visitor The callback used to visit a Node.
-     * @param test A node test to execute for each node.
-     * @param start An optional value indicating the starting offset at which to start visiting.
-     * @param count An optional value indicating the maximum number of nodes to visit.
-     */
-    function visitNodes<T extends Node>(nodes: NodeArray<T> | undefined, visitor: Visitor, test?: (node: Node) => boolean, start?: number, count?: number): NodeArray<T> | undefined;
-    /**
-     * Starts a new lexical environment and visits a statement list, ending the lexical environment
-     * and merging hoisted declarations upon completion.
-     */
-    function visitLexicalEnvironment(statements: NodeArray<Statement>, visitor: Visitor, context: TransformationContext, start?: number, ensureUseStrict?: boolean): NodeArray<Statement>;
-    /**
-     * Starts a new lexical environment and visits a parameter list, suspending the lexical
-     * environment upon completion.
-     */
-    function visitParameterList(nodes: NodeArray<ParameterDeclaration> | undefined, visitor: Visitor, context: TransformationContext, nodesVisitor?: typeof visitNodes): NodeArray<ParameterDeclaration>;
-    /**
-     * Resumes a suspended lexical environment and visits a function body, ending the lexical
-     * environment and merging hoisted declarations upon completion.
-     */
-    function visitFunctionBody(node: FunctionBody, visitor: Visitor, context: TransformationContext): FunctionBody;
-    /**
-     * Resumes a suspended lexical environment and visits a function body, ending the lexical
-     * environment and merging hoisted declarations upon completion.
-     */
-    function visitFunctionBody(node: FunctionBody | undefined, visitor: Visitor, context: TransformationContext): FunctionBody | undefined;
-    /**
-     * Resumes a suspended lexical environment and visits a concise body, ending the lexical
-     * environment and merging hoisted declarations upon completion.
-     */
-    function visitFunctionBody(node: ConciseBody, visitor: Visitor, context: TransformationContext): ConciseBody;
-    /**
-     * Visits each child of a Node using the supplied visitor, possibly returning a new Node of the same kind in its place.
-     *
-     * @param node The Node whose children will be visited.
-     * @param visitor The callback used to visit each child.
-     * @param context A lexical environment context for the visitor.
-     */
-    function visitEachChild<T extends Node>(node: T, visitor: Visitor, context: TransformationContext): T;
-    /**
-     * Visits each child of a Node using the supplied visitor, possibly returning a new Node of the same kind in its place.
-     *
-     * @param node The Node whose children will be visited.
-     * @param visitor The callback used to visit each child.
-     * @param context A lexical environment context for the visitor.
-     */
-    function visitEachChild<T extends Node>(node: T | undefined, visitor: Visitor, context: TransformationContext, nodesVisitor?: typeof visitNodes, tokenVisitor?: Visitor): T | undefined;
-}
-declare namespace ts {
-    function createPrinter(printerOptions?: PrinterOptions, handlers?: PrintHandlers): Printer;
-}
-declare namespace ts {
-    function findConfigFile(searchPath: string, fileExists: (fileName: string) => boolean, configName?: string): string | undefined;
-    function resolveTripleslashReference(moduleName: string, containingFile: string): string;
-    function createCompilerHost(options: CompilerOptions, setParentNodes?: boolean): CompilerHost;
-    function getPreEmitDiagnostics(program: Program, sourceFile?: SourceFile, cancellationToken?: CancellationToken): Diagnostic[];
-    interface FormatDiagnosticsHost {
-        getCurrentDirectory(): string;
-        getCanonicalFileName(fileName: string): string;
-        getNewLine(): string;
-    }
-    function formatDiagnostics(diagnostics: ReadonlyArray<Diagnostic>, host: FormatDiagnosticsHost): string;
-    function formatDiagnostic(diagnostic: Diagnostic, host: FormatDiagnosticsHost): string;
-    function formatDiagnosticsWithColorAndContext(diagnostics: ReadonlyArray<Diagnostic>, host: FormatDiagnosticsHost): string;
-    function flattenDiagnosticMessageText(messageText: string | DiagnosticMessageChain | undefined, newLine: string): string;
-    function getConfigFileParsingDiagnostics(configFileParseResult: ParsedCommandLine): ReadonlyArray<Diagnostic>;
-    /**
-     * Create a new 'Program' instance. A Program is an immutable collection of 'SourceFile's and a 'CompilerOptions'
-     * that represent a compilation unit.
-     *
-     * Creating a program proceeds from a set of root files, expanding the set of inputs by following imports and
-     * triple-slash-reference-path directives transitively. '@types' and triple-slash-reference-types are also pulled in.
-     *
-     * @param createProgramOptions - The options for creating a program.
-     * @returns A 'Program' object.
-     */
-    function createProgram(createProgramOptions: CreateProgramOptions): Program;
-    /**
-     * Create a new 'Program' instance. A Program is an immutable collection of 'SourceFile's and a 'CompilerOptions'
-     * that represent a compilation unit.
-     *
-     * Creating a program proceeds from a set of root files, expanding the set of inputs by following imports and
-     * triple-slash-reference-path directives transitively. '@types' and triple-slash-reference-types are also pulled in.
-     *
-     * @param rootNames - A set of root files.
-     * @param options - The compiler options which should be used.
-     * @param host - The host interacts with the underlying file system.
-     * @param oldProgram - Reuses an old program structure.
-     * @param configFileParsingDiagnostics - error during config file parsing
-     * @returns A 'Program' object.
-     */
-    function createProgram(rootNames: ReadonlyArray<string>, options: CompilerOptions, host?: CompilerHost, oldProgram?: Program, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>): Program;
-    /**
-     * Returns the target config filename of a project reference
-     */
-    function resolveProjectReferencePath(host: CompilerHost, ref: ProjectReference): string | undefined;
-}
-declare namespace ts {
-    interface EmitOutput {
-        outputFiles: OutputFile[];
-        emitSkipped: boolean;
-    }
-    interface OutputFile {
-        name: string;
-        writeByteOrderMark: boolean;
-        text: string;
-    }
-}
-declare namespace ts {
-    type AffectedFileResult<T> = {
-        result: T;
-        affected: SourceFile | Program;
-    } | undefined;
-    interface BuilderProgramHost {
-        /**
-         * return true if file names are treated with case sensitivity
-         */
-        useCaseSensitiveFileNames(): boolean;
-        /**
-         * If provided this would be used this hash instead of actual file shape text for detecting changes
-         */
-        createHash?: (data: string) => string;
-        /**
-         * When emit or emitNextAffectedFile are called without writeFile,
-         * this callback if present would be used to write files
-         */
-        writeFile?: WriteFileCallback;
-    }
-    /**
-     * Builder to manage the program state changes
-     */
-    interface BuilderProgram {
-        /**
-         * Returns current program
-         */
-        getProgram(): Program;
-        /**
-         * Get compiler options of the program
-         */
-        getCompilerOptions(): CompilerOptions;
-        /**
-         * Get the source file in the program with file name
-         */
-        getSourceFile(fileName: string): SourceFile | undefined;
-        /**
-         * Get a list of files in the program
-         */
-        getSourceFiles(): ReadonlyArray<SourceFile>;
-        /**
-         * Get the diagnostics for compiler options
-         */
-        getOptionsDiagnostics(cancellationToken?: CancellationToken): ReadonlyArray<Diagnostic>;
-        /**
-         * Get the diagnostics that dont belong to any file
-         */
-        getGlobalDiagnostics(cancellationToken?: CancellationToken): ReadonlyArray<Diagnostic>;
-        /**
-         * Get the diagnostics from config file parsing
-         */
-        getConfigFileParsingDiagnostics(): ReadonlyArray<Diagnostic>;
-        /**
-         * Get the syntax diagnostics, for all source files if source file is not supplied
-         */
-        getSyntacticDiagnostics(sourceFile?: SourceFile, cancellationToken?: CancellationToken): ReadonlyArray<Diagnostic>;
-        /**
-         * Get all the dependencies of the file
-         */
-        getAllDependencies(sourceFile: SourceFile): ReadonlyArray<string>;
-        /**
-         * Gets the semantic diagnostics from the program corresponding to this state of file (if provided) or whole program
-         * The semantic diagnostics are cached and managed here
-         * Note that it is assumed that when asked about semantic diagnostics through this API,
-         * the file has been taken out of affected files so it is safe to use cache or get from program and cache the diagnostics
-         * In case of SemanticDiagnosticsBuilderProgram if the source file is not provided,
-         * it will iterate through all the affected files, to ensure that cache stays valid and yet provide a way to get all semantic diagnostics
-         */
-        getSemanticDiagnostics(sourceFile?: SourceFile, cancellationToken?: CancellationToken): ReadonlyArray<Diagnostic>;
-        /**
-         * Emits the JavaScript and declaration files.
-         * When targetSource file is specified, emits the files corresponding to that source file,
-         * otherwise for the whole program.
-         * In case of EmitAndSemanticDiagnosticsBuilderProgram, when targetSourceFile is specified,
-         * it is assumed that that file is handled from affected file list. If targetSourceFile is not specified,
-         * it will only emit all the affected files instead of whole program
-         *
-         * The first of writeFile if provided, writeFile of BuilderProgramHost if provided, writeFile of compiler host
-         * in that order would be used to write the files
-         */
-        emit(targetSourceFile?: SourceFile, writeFile?: WriteFileCallback, cancellationToken?: CancellationToken, emitOnlyDtsFiles?: boolean, customTransformers?: CustomTransformers): EmitResult;
-        /**
-         * Get the current directory of the program
-         */
-        getCurrentDirectory(): string;
-    }
-    /**
-     * The builder that caches the semantic diagnostics for the program and handles the changed files and affected files
-     */
-    interface SemanticDiagnosticsBuilderProgram extends BuilderProgram {
-        /**
-         * Gets the semantic diagnostics from the program for the next affected file and caches it
-         * Returns undefined if the iteration is complete
-         */
-        getSemanticDiagnosticsOfNextAffectedFile(cancellationToken?: CancellationToken, ignoreSourceFile?: (sourceFile: SourceFile) => boolean): AffectedFileResult<ReadonlyArray<Diagnostic>>;
-    }
-    /**
-     * The builder that can handle the changes in program and iterate through changed file to emit the files
-     * The semantic diagnostics are cached per file and managed by clearing for the changed/affected files
-     */
-    interface EmitAndSemanticDiagnosticsBuilderProgram extends BuilderProgram {
-        /**
-         * Emits the next affected file's emit result (EmitResult and sourceFiles emitted) or returns undefined if iteration is complete
-         * The first of writeFile if provided, writeFile of BuilderProgramHost if provided, writeFile of compiler host
-         * in that order would be used to write the files
-         */
-        emitNextAffectedFile(writeFile?: WriteFileCallback, cancellationToken?: CancellationToken, emitOnlyDtsFiles?: boolean, customTransformers?: CustomTransformers): AffectedFileResult<EmitResult>;
-    }
-    /**
-     * Create the builder to manage semantic diagnostics and cache them
-     */
-    function createSemanticDiagnosticsBuilderProgram(newProgram: Program, host: BuilderProgramHost, oldProgram?: SemanticDiagnosticsBuilderProgram, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>): SemanticDiagnosticsBuilderProgram;
-    function createSemanticDiagnosticsBuilderProgram(rootNames: ReadonlyArray<string> | undefined, options: CompilerOptions | undefined, host?: CompilerHost, oldProgram?: SemanticDiagnosticsBuilderProgram, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>): SemanticDiagnosticsBuilderProgram;
-    /**
-     * Create the builder that can handle the changes in program and iterate through changed files
-     * to emit the those files and manage semantic diagnostics cache as well
-     */
-    function createEmitAndSemanticDiagnosticsBuilderProgram(newProgram: Program, host: BuilderProgramHost, oldProgram?: EmitAndSemanticDiagnosticsBuilderProgram, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>): EmitAndSemanticDiagnosticsBuilderProgram;
-    function createEmitAndSemanticDiagnosticsBuilderProgram(rootNames: ReadonlyArray<string> | undefined, options: CompilerOptions | undefined, host?: CompilerHost, oldProgram?: EmitAndSemanticDiagnosticsBuilderProgram, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>): EmitAndSemanticDiagnosticsBuilderProgram;
-    /**
-     * Creates a builder thats just abstraction over program and can be used with watch
-     */
-    function createAbstractBuilder(newProgram: Program, host: BuilderProgramHost, oldProgram?: BuilderProgram, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>): BuilderProgram;
-    function createAbstractBuilder(rootNames: ReadonlyArray<string> | undefined, options: CompilerOptions | undefined, host?: CompilerHost, oldProgram?: BuilderProgram, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>): BuilderProgram;
-}
-declare namespace ts {
-    type WatchStatusReporter = (diagnostic: Diagnostic, newLine: string, options: CompilerOptions) => void;
-    /** Create the program with rootNames and options, if they are undefined, oldProgram and new configFile diagnostics create new program */
-    type CreateProgram<T extends BuilderProgram> = (rootNames: ReadonlyArray<string> | undefined, options: CompilerOptions | undefined, host?: CompilerHost, oldProgram?: T, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>) => T;
-    interface WatchCompilerHost<T extends BuilderProgram> {
-        /**
-         * Used to create the program when need for program creation or recreation detected
-         */
-        createProgram: CreateProgram<T>;
-        /** If provided, callback to invoke after every new program creation */
-        afterProgramCreate?(program: T): void;
-        /** If provided, called with Diagnostic message that informs about change in watch status */
-        onWatchStatusChange?(diagnostic: Diagnostic, newLine: string, options: CompilerOptions): void;
-        useCaseSensitiveFileNames(): boolean;
-        getNewLine(): string;
-        getCurrentDirectory(): string;
-        getDefaultLibFileName(options: CompilerOptions): string;
-        getDefaultLibLocation?(): string;
-        createHash?(data: string): string;
-        /**
-         * Use to check file presence for source files and
-         * if resolveModuleNames is not provided (complier is in charge of module resolution) then module files as well
-         */
-        fileExists(path: string): boolean;
-        /**
-         * Use to read file text for source files and
-         * if resolveModuleNames is not provided (complier is in charge of module resolution) then module files as well
-         */
-        readFile(path: string, encoding?: string): string | undefined;
-        /** If provided, used for module resolution as well as to handle directory structure */
-        directoryExists?(path: string): boolean;
-        /** If provided, used in resolutions as well as handling directory structure */
-        getDirectories?(path: string): string[];
-        /** If provided, used to cache and handle directory structure modifications */
-        readDirectory?(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
-        /** Symbol links resolution */
-        realpath?(path: string): string;
-        /** If provided would be used to write log about compilation */
-        trace?(s: string): void;
-        /** If provided is used to get the environment variable */
-        getEnvironmentVariable?(name: string): string | undefined;
-        /** If provided, used to resolve the module names, otherwise typescript's default module resolution */
-        resolveModuleNames?(moduleNames: string[], containingFile: string, reusedNames?: string[]): ResolvedModule[];
-        /** If provided, used to resolve type reference directives, otherwise typescript's default resolution */
-        resolveTypeReferenceDirectives?(typeReferenceDirectiveNames: string[], containingFile: string): ResolvedTypeReferenceDirective[];
-        /** Used to watch changes in source files, missing files needed to update the program or config file */
-        watchFile(path: string, callback: FileWatcherCallback, pollingInterval?: number): FileWatcher;
-        /** Used to watch resolved module's failed lookup locations, config file specs, type roots where auto type reference directives are added */
-        watchDirectory(path: string, callback: DirectoryWatcherCallback, recursive?: boolean): FileWatcher;
-        /** If provided, will be used to set delayed compilation, so that multiple changes in short span are compiled together */
-        setTimeout?(callback: (...args: any[]) => void, ms: number, ...args: any[]): any;
-        /** If provided, will be used to reset existing delayed compilation */
-        clearTimeout?(timeoutId: any): void;
-    }
-    /**
-     * Host to create watch with root files and options
-     */
-    interface WatchCompilerHostOfFilesAndCompilerOptions<T extends BuilderProgram> extends WatchCompilerHost<T> {
-        /** root files to use to generate program */
-        rootFiles: string[];
-        /** Compiler options */
-        options: CompilerOptions;
-    }
-    /**
-     * Host to create watch with config file
-     */
-    interface WatchCompilerHostOfConfigFile<T extends BuilderProgram> extends WatchCompilerHost<T>, ConfigFileDiagnosticsReporter {
-        /** Name of the config file to compile */
-        configFileName: string;
-        /** Options to extend */
-        optionsToExtend?: CompilerOptions;
-        /**
-         * Used to generate source file names from the config file and its include, exclude, files rules
-         * and also to cache the directory stucture
-         */
-        readDirectory(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
-    }
-    interface Watch<T> {
-        /** Synchronize with host and get updated program */
-        getProgram(): T;
-    }
-    /**
-     * Creates the watch what generates program using the config file
-     */
-    interface WatchOfConfigFile<T> extends Watch<T> {
-    }
-    /**
-     * Creates the watch that generates program using the root files and compiler options
-     */
-    interface WatchOfFilesAndCompilerOptions<T> extends Watch<T> {
-        /** Updates the root files in the program, only if this is not config file compilation */
-        updateRootFileNames(fileNames: string[]): void;
-    }
-    /**
-     * Create the watch compiler host for either configFile or fileNames and its options
-     */
-    function createWatchCompilerHost<T extends BuilderProgram>(rootFiles: string[], options: CompilerOptions, system: System, createProgram?: CreateProgram<T>, reportDiagnostic?: DiagnosticReporter, reportWatchStatus?: WatchStatusReporter): WatchCompilerHostOfFilesAndCompilerOptions<T>;
-    function createWatchCompilerHost<T extends BuilderProgram>(configFileName: string, optionsToExtend: CompilerOptions | undefined, system: System, createProgram?: CreateProgram<T>, reportDiagnostic?: DiagnosticReporter, reportWatchStatus?: WatchStatusReporter): WatchCompilerHostOfConfigFile<T>;
-    /**
-     * Creates the watch from the host for root files and compiler options
-     */
-    function createWatchProgram<T extends BuilderProgram>(host: WatchCompilerHostOfFilesAndCompilerOptions<T>): WatchOfFilesAndCompilerOptions<T>;
-    /**
-     * Creates the watch from the host for config file
-     */
-    function createWatchProgram<T extends BuilderProgram>(host: WatchCompilerHostOfConfigFile<T>): WatchOfConfigFile<T>;
-}
-declare namespace ts {
-    function parseCommandLine(commandLine: ReadonlyArray<string>, readFile?: (path: string) => string | undefined): ParsedCommandLine;
-    type DiagnosticReporter = (diagnostic: Diagnostic) => void;
-    /**
-     * Reports config file diagnostics
-     */
-    interface ConfigFileDiagnosticsReporter {
-        /**
-         * Reports unrecoverable error when parsing config file
-         */
-        onUnRecoverableConfigFileDiagnostic: DiagnosticReporter;
-    }
-    /**
-     * Interface extending ParseConfigHost to support ParseConfigFile that reads config file and reports errors
-     */
-    interface ParseConfigFileHost extends ParseConfigHost, ConfigFileDiagnosticsReporter {
-        getCurrentDirectory(): string;
-    }
-    /**
-     * Reads the config file, reports errors if any and exits if the config file cannot be found
-     */
-    function getParsedCommandLineOfConfigFile(configFileName: string, optionsToExtend: CompilerOptions, host: ParseConfigFileHost): ParsedCommandLine | undefined;
-    /**
-     * Read tsconfig.json file
-     * @param fileName The path to the config file
-     */
-    function readConfigFile(fileName: string, readFile: (path: string) => string | undefined): {
-        config?: any;
-        error?: Diagnostic;
-    };
-    /**
-     * Parse the text of the tsconfig.json file
-     * @param fileName The path to the config file
-     * @param jsonText The text of the config file
-     */
-    function parseConfigFileTextToJson(fileName: string, jsonText: string): {
-        config?: any;
-        error?: Diagnostic;
-    };
-    /**
-     * Read tsconfig.json file
-     * @param fileName The path to the config file
-     */
-    function readJsonConfigFile(fileName: string, readFile: (path: string) => string | undefined): TsConfigSourceFile;
-    /**
-     * Convert the json syntax tree into the json value
-     */
-    function convertToObject(sourceFile: JsonSourceFile, errors: Push<Diagnostic>): any;
-    /**
-     * Parse the contents of a config file (tsconfig.json).
-     * @param json The contents of the config file to parse
-     * @param host Instance of ParseConfigHost used to enumerate files in folder.
-     * @param basePath A root directory to resolve relative path entries in the config
-     *    file to. e.g. outDir
-     */
-    function parseJsonConfigFileContent(json: any, host: ParseConfigHost, basePath: string, existingOptions?: CompilerOptions, configFileName?: string, resolutionStack?: Path[], extraFileExtensions?: ReadonlyArray<FileExtensionInfo>): ParsedCommandLine;
-    /**
-     * Parse the contents of a config file (tsconfig.json).
-     * @param jsonNode The contents of the config file to parse
-     * @param host Instance of ParseConfigHost used to enumerate files in folder.
-     * @param basePath A root directory to resolve relative path entries in the config
-     *    file to. e.g. outDir
-     */
-    function parseJsonSourceFileConfigFileContent(sourceFile: TsConfigSourceFile, host: ParseConfigHost, basePath: string, existingOptions?: CompilerOptions, configFileName?: string, resolutionStack?: Path[], extraFileExtensions?: ReadonlyArray<FileExtensionInfo>): ParsedCommandLine;
-    function convertCompilerOptionsFromJson(jsonOptions: any, basePath: string, configFileName?: string): {
-        options: CompilerOptions;
-        errors: Diagnostic[];
-    };
-    function convertTypeAcquisitionFromJson(jsonOptions: any, basePath: string, configFileName?: string): {
-        options: TypeAcquisition;
-        errors: Diagnostic[];
-    };
-}
-declare namespace ts {
-    interface Node {
-        getSourceFile(): SourceFile;
-        getChildCount(sourceFile?: SourceFile): number;
-        getChildAt(index: number, sourceFile?: SourceFile): Node;
-        getChildren(sourceFile?: SourceFile): Node[];
-        getStart(sourceFile?: SourceFile, includeJsDocComment?: boolean): number;
-        getFullStart(): number;
-        getEnd(): number;
-        getWidth(sourceFile?: SourceFileLike): number;
-        getFullWidth(): number;
-        getLeadingTriviaWidth(sourceFile?: SourceFile): number;
-        getFullText(sourceFile?: SourceFile): string;
-        getText(sourceFile?: SourceFile): string;
-        getFirstToken(sourceFile?: SourceFile): Node | undefined;
-        getLastToken(sourceFile?: SourceFile): Node | undefined;
-        forEachChild<T>(cbNode: (node: Node) => T | undefined, cbNodeArray?: (nodes: NodeArray<Node>) => T | undefined): T | undefined;
-    }
-    interface Identifier {
-        readonly text: string;
-    }
-    interface Symbol {
-        readonly name: string;
-        getFlags(): SymbolFlags;
-        getEscapedName(): __String;
-        getName(): string;
-        getDeclarations(): Declaration[] | undefined;
-        getDocumentationComment(typeChecker: TypeChecker | undefined): SymbolDisplayPart[];
-        getJsDocTags(): JSDocTagInfo[];
-    }
-    interface Type {
-        getFlags(): TypeFlags;
-        getSymbol(): Symbol | undefined;
-        getProperties(): Symbol[];
-        getProperty(propertyName: string): Symbol | undefined;
-        getApparentProperties(): Symbol[];
-        getCallSignatures(): Signature[];
-        getConstructSignatures(): Signature[];
-        getStringIndexType(): Type | undefined;
-        getNumberIndexType(): Type | undefined;
-        getBaseTypes(): BaseType[] | undefined;
-        getNonNullableType(): Type;
-        getConstraint(): Type | undefined;
-        getDefault(): Type | undefined;
-        isUnion(): this is UnionType;
-        isIntersection(): this is IntersectionType;
-        isUnionOrIntersection(): this is UnionOrIntersectionType;
-        isLiteral(): this is LiteralType;
-        isStringLiteral(): this is StringLiteralType;
-        isNumberLiteral(): this is NumberLiteralType;
-        isTypeParameter(): this is TypeParameter;
-        isClassOrInterface(): this is InterfaceType;
-        isClass(): this is InterfaceType;
-    }
-    interface Signature {
-        getDeclaration(): SignatureDeclaration;
-        getTypeParameters(): TypeParameter[] | undefined;
-        getParameters(): Symbol[];
-        getReturnType(): Type;
-        getDocumentationComment(typeChecker: TypeChecker | undefined): SymbolDisplayPart[];
-        getJsDocTags(): JSDocTagInfo[];
-    }
-    interface SourceFile {
-        getLineAndCharacterOfPosition(pos: number): LineAndCharacter;
-        getLineEndOfPosition(pos: number): number;
-        getLineStarts(): ReadonlyArray<number>;
-        getPositionOfLineAndCharacter(line: number, character: number): number;
-        update(newText: string, textChangeRange: TextChangeRange): SourceFile;
-    }
-    interface SourceFileLike {
-        getLineAndCharacterOfPosition(pos: number): LineAndCharacter;
-    }
-    interface SourceMapSource {
-        getLineAndCharacterOfPosition(pos: number): LineAndCharacter;
-    }
-    /**
-     * Represents an immutable snapshot of a script at a specified time.Once acquired, the
-     * snapshot is observably immutable. i.e. the same calls with the same parameters will return
-     * the same values.
-     */
-    interface IScriptSnapshot {
-        /** Gets a portion of the script snapshot specified by [start, end). */
-        getText(start: number, end: number): string;
-        /** Gets the length of this script snapshot. */
-        getLength(): number;
-        /**
-         * Gets the TextChangeRange that describe how the text changed between this text and
-         * an older version.  This information is used by the incremental parser to determine
-         * what sections of the script need to be re-parsed.  'undefined' can be returned if the
-         * change range cannot be determined.  However, in that case, incremental parsing will
-         * not happen and the entire document will be re - parsed.
-         */
-        getChangeRange(oldSnapshot: IScriptSnapshot): TextChangeRange | undefined;
-        /** Releases all resources held by this script snapshot */
-        dispose?(): void;
-    }
-    namespace ScriptSnapshot {
-        function fromString(text: string): IScriptSnapshot;
-    }
-    interface PreProcessedFileInfo {
-        referencedFiles: FileReference[];
-        typeReferenceDirectives: FileReference[];
-        libReferenceDirectives: FileReference[];
-        importedFiles: FileReference[];
-        ambientExternalModules?: string[];
-        isLibFile: boolean;
-    }
-    interface HostCancellationToken {
-        isCancellationRequested(): boolean;
-    }
-    interface InstallPackageOptions {
-        fileName: Path;
-        packageName: string;
-    }
-    interface LanguageServiceHost extends GetEffectiveTypeRootsHost {
-        getCompilationSettings(): CompilerOptions;
-        getNewLine?(): string;
-        getProjectVersion?(): string;
-        getScriptFileNames(): string[];
-        getScriptKind?(fileName: string): ScriptKind;
-        getScriptVersion(fileName: string): string;
-        getScriptSnapshot(fileName: string): IScriptSnapshot | undefined;
-        getProjectReferences?(): ReadonlyArray<ProjectReference> | undefined;
-        getLocalizedDiagnosticMessages?(): any;
-        getCancellationToken?(): HostCancellationToken;
-        getCurrentDirectory(): string;
-        getDefaultLibFileName(options: CompilerOptions): string;
-        log?(s: string): void;
-        trace?(s: string): void;
-        error?(s: string): void;
-        useCaseSensitiveFileNames?(): boolean;
-        readDirectory?(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
-        readFile?(path: string, encoding?: string): string | undefined;
-        realpath?(path: string): string;
-        fileExists?(path: string): boolean;
-        getTypeRootsVersion?(): number;
-        resolveModuleNames?(moduleNames: string[], containingFile: string, reusedNames?: string[]): ResolvedModule[];
-        getResolvedModuleWithFailedLookupLocationsFromCache?(modulename: string, containingFile: string): ResolvedModuleWithFailedLookupLocations | undefined;
-        resolveTypeReferenceDirectives?(typeDirectiveNames: string[], containingFile: string): ResolvedTypeReferenceDirective[];
-        getDirectories?(directoryName: string): string[];
-        /**
-         * Gets a set of custom transformers to use during emit.
-         */
-        getCustomTransformers?(): CustomTransformers | undefined;
-        isKnownTypesPackageName?(name: string): boolean;
-        installPackage?(options: InstallPackageOptions): Promise<ApplyCodeActionCommandResult>;
-    }
-    interface UserPreferences {
-        readonly disableSuggestions?: boolean;
-        readonly quotePreference?: "double" | "single";
-        readonly includeCompletionsForModuleExports?: boolean;
-        readonly includeCompletionsWithInsertText?: boolean;
-        readonly importModuleSpecifierPreference?: "relative" | "non-relative";
-        readonly allowTextChangesInNewFiles?: boolean;
-    }
-    interface LanguageService {
-        cleanupSemanticCache(): void;
-        getSyntacticDiagnostics(fileName: string): DiagnosticWithLocation[];
-        /** The first time this is called, it will return global diagnostics (no location). */
-        getSemanticDiagnostics(fileName: string): Diagnostic[];
-        getSuggestionDiagnostics(fileName: string): DiagnosticWithLocation[];
-        getCompilerOptionsDiagnostics(): Diagnostic[];
-        /**
-         * @deprecated Use getEncodedSyntacticClassifications instead.
-         */
-        getSyntacticClassifications(fileName: string, span: TextSpan): ClassifiedSpan[];
-        /**
-         * @deprecated Use getEncodedSemanticClassifications instead.
-         */
-        getSemanticClassifications(fileName: string, span: TextSpan): ClassifiedSpan[];
-        getEncodedSyntacticClassifications(fileName: string, span: TextSpan): Classifications;
-        getEncodedSemanticClassifications(fileName: string, span: TextSpan): Classifications;
-        getCompletionsAtPosition(fileName: string, position: number, options: GetCompletionsAtPositionOptions | undefined): CompletionInfo | undefined;
-        getCompletionEntryDetails(fileName: string, position: number, name: string, formatOptions: FormatCodeOptions | FormatCodeSettings | undefined, source: string | undefined, preferences: UserPreferences | undefined): CompletionEntryDetails | undefined;
-        getCompletionEntrySymbol(fileName: string, position: number, name: string, source: string | undefined): Symbol | undefined;
-        getQuickInfoAtPosition(fileName: string, position: number): QuickInfo | undefined;
-        getNameOrDottedNameSpan(fileName: string, startPos: number, endPos: number): TextSpan | undefined;
-        getBreakpointStatementAtPosition(fileName: string, position: number): TextSpan | undefined;
-        getSignatureHelpItems(fileName: string, position: number): SignatureHelpItems | undefined;
-        getRenameInfo(fileName: string, position: number): RenameInfo;
-        findRenameLocations(fileName: string, position: number, findInStrings: boolean, findInComments: boolean): RenameLocation[] | undefined;
-        getDefinitionAtPosition(fileName: string, position: number): DefinitionInfo[] | undefined;
-        getDefinitionAndBoundSpan(fileName: string, position: number): DefinitionInfoAndBoundSpan | undefined;
-        getTypeDefinitionAtPosition(fileName: string, position: number): DefinitionInfo[] | undefined;
-        getImplementationAtPosition(fileName: string, position: number): ImplementationLocation[] | undefined;
-        getReferencesAtPosition(fileName: string, position: number): ReferenceEntry[] | undefined;
-        findReferences(fileName: string, position: number): ReferencedSymbol[] | undefined;
-        getDocumentHighlights(fileName: string, position: number, filesToSearch: string[]): DocumentHighlights[] | undefined;
-        /** @deprecated */
-        getOccurrencesAtPosition(fileName: string, position: number): ReferenceEntry[] | undefined;
-        getNavigateToItems(searchValue: string, maxResultCount?: number, fileName?: string, excludeDtsFiles?: boolean): NavigateToItem[];
-        getNavigationBarItems(fileName: string): NavigationBarItem[];
-        getNavigationTree(fileName: string): NavigationTree;
-        getOutliningSpans(fileName: string): OutliningSpan[];
-        getTodoComments(fileName: string, descriptors: TodoCommentDescriptor[]): TodoComment[];
-        getBraceMatchingAtPosition(fileName: string, position: number): TextSpan[];
-        getIndentationAtPosition(fileName: string, position: number, options: EditorOptions | EditorSettings): number;
-        getFormattingEditsForRange(fileName: string, start: number, end: number, options: FormatCodeOptions | FormatCodeSettings): TextChange[];
-        getFormattingEditsForDocument(fileName: string, options: FormatCodeOptions | FormatCodeSettings): TextChange[];
-        getFormattingEditsAfterKeystroke(fileName: string, position: number, key: string, options: FormatCodeOptions | FormatCodeSettings): TextChange[];
-        getDocCommentTemplateAtPosition(fileName: string, position: number): TextInsertion | undefined;
-        isValidBraceCompletionAtPosition(fileName: string, position: number, openingBrace: number): boolean;
-        /**
-         * This will return a defined result if the position is after the `>` of the opening tag, or somewhere in the text, of a JSXElement with no closing tag.
-         * Editors should call this after `>` is typed.
-         */
-        getJsxClosingTagAtPosition(fileName: string, position: number): JsxClosingTagInfo | undefined;
-        getSpanOfEnclosingComment(fileName: string, position: number, onlyMultiLine: boolean): TextSpan | undefined;
-        toLineColumnOffset?(fileName: string, position: number): LineAndCharacter;
-        getCodeFixesAtPosition(fileName: string, start: number, end: number, errorCodes: ReadonlyArray<number>, formatOptions: FormatCodeSettings, preferences: UserPreferences): ReadonlyArray<CodeFixAction>;
-        getCombinedCodeFix(scope: CombinedCodeFixScope, fixId: {}, formatOptions: FormatCodeSettings, preferences: UserPreferences): CombinedCodeActions;
-        applyCodeActionCommand(action: CodeActionCommand): Promise<ApplyCodeActionCommandResult>;
-        applyCodeActionCommand(action: CodeActionCommand[]): Promise<ApplyCodeActionCommandResult[]>;
-        applyCodeActionCommand(action: CodeActionCommand | CodeActionCommand[]): Promise<ApplyCodeActionCommandResult | ApplyCodeActionCommandResult[]>;
-        /** @deprecated `fileName` will be ignored */
-        applyCodeActionCommand(fileName: string, action: CodeActionCommand): Promise<ApplyCodeActionCommandResult>;
-        /** @deprecated `fileName` will be ignored */
-        applyCodeActionCommand(fileName: string, action: CodeActionCommand[]): Promise<ApplyCodeActionCommandResult[]>;
-        /** @deprecated `fileName` will be ignored */
-        applyCodeActionCommand(fileName: string, action: CodeActionCommand | CodeActionCommand[]): Promise<ApplyCodeActionCommandResult | ApplyCodeActionCommandResult[]>;
-        getApplicableRefactors(fileName: string, positionOrRange: number | TextRange, preferences: UserPreferences | undefined): ApplicableRefactorInfo[];
-        getEditsForRefactor(fileName: string, formatOptions: FormatCodeSettings, positionOrRange: number | TextRange, refactorName: string, actionName: string, preferences: UserPreferences | undefined): RefactorEditInfo | undefined;
-        organizeImports(scope: OrganizeImportsScope, formatOptions: FormatCodeSettings, preferences: UserPreferences | undefined): ReadonlyArray<FileTextChanges>;
-        getEditsForFileRename(oldFilePath: string, newFilePath: string, formatOptions: FormatCodeSettings, preferences: UserPreferences | undefined): ReadonlyArray<FileTextChanges>;
-        getEmitOutput(fileName: string, emitOnlyDtsFiles?: boolean): EmitOutput;
-        getProgram(): Program | undefined;
-        dispose(): void;
-    }
-    interface JsxClosingTagInfo {
-        readonly newText: string;
-    }
-    interface CombinedCodeFixScope {
-        type: "file";
-        fileName: string;
-    }
-    type OrganizeImportsScope = CombinedCodeFixScope;
-    type CompletionsTriggerCharacter = "." | '"' | "'" | "`" | "/" | "@" | "<";
-    interface GetCompletionsAtPositionOptions extends UserPreferences {
-        /** If the editor is asking for completions because a certain character was typed, and not because the user explicitly requested them, this should be set. */
-        triggerCharacter?: CompletionsTriggerCharacter;
-        /** @deprecated Use includeCompletionsForModuleExports */
-        includeExternalModuleExports?: boolean;
-        /** @deprecated Use includeCompletionsWithInsertText */
-        includeInsertTextCompletions?: boolean;
-    }
-    interface ApplyCodeActionCommandResult {
-        successMessage: string;
-    }
-    interface Classifications {
-        spans: number[];
-        endOfLineState: EndOfLineState;
-    }
-    interface ClassifiedSpan {
-        textSpan: TextSpan;
-        classificationType: ClassificationTypeNames;
-    }
-    /**
-     * Navigation bar interface designed for visual studio's dual-column layout.
-     * This does not form a proper tree.
-     * The navbar is returned as a list of top-level items, each of which has a list of child items.
-     * Child items always have an empty array for their `childItems`.
-     */
-    interface NavigationBarItem {
-        text: string;
-        kind: ScriptElementKind;
-        kindModifiers: string;
-        spans: TextSpan[];
-        childItems: NavigationBarItem[];
-        indent: number;
-        bolded: boolean;
-        grayed: boolean;
-    }
-    /**
-     * Node in a tree of nested declarations in a file.
-     * The top node is always a script or module node.
-     */
-    interface NavigationTree {
-        /** Name of the declaration, or a short description, e.g. "<class>". */
-        text: string;
-        kind: ScriptElementKind;
-        /** ScriptElementKindModifier separated by commas, e.g. "public,abstract" */
-        kindModifiers: string;
-        /**
-         * Spans of the nodes that generated this declaration.
-         * There will be more than one if this is the result of merging.
-         */
-        spans: TextSpan[];
-        nameSpan: TextSpan | undefined;
-        /** Present if non-empty */
-        childItems?: NavigationTree[];
-    }
-    interface TodoCommentDescriptor {
-        text: string;
-        priority: number;
-    }
-    interface TodoComment {
-        descriptor: TodoCommentDescriptor;
-        message: string;
-        position: number;
-    }
-    class TextChange {
-        span: TextSpan;
-        newText: string;
-    }
-    interface FileTextChanges {
-        fileName: string;
-        textChanges: TextChange[];
-        isNewFile?: boolean;
-    }
-    interface CodeAction {
-        /** Description of the code action to display in the UI of the editor */
-        description: string;
-        /** Text changes to apply to each file as part of the code action */
-        changes: FileTextChanges[];
-        /**
-         * If the user accepts the code fix, the editor should send the action back in a `applyAction` request.
-         * This allows the language service to have side effects (e.g. installing dependencies) upon a code fix.
-         */
-        commands?: CodeActionCommand[];
-    }
-    interface CodeFixAction extends CodeAction {
-        /** Short name to identify the fix, for use by telemetry. */
-        fixName: string;
-        /**
-         * If present, one may call 'getCombinedCodeFix' with this fixId.
-         * This may be omitted to indicate that the code fix can't be applied in a group.
-         */
-        fixId?: {};
-        fixAllDescription?: string;
-    }
-    interface CombinedCodeActions {
-        changes: ReadonlyArray<FileTextChanges>;
-        commands?: ReadonlyArray<CodeActionCommand>;
-    }
-    type CodeActionCommand = InstallPackageAction;
-    interface InstallPackageAction {
-    }
-    /**
-     * A set of one or more available refactoring actions, grouped under a parent refactoring.
-     */
-    interface ApplicableRefactorInfo {
-        /**
-         * The programmatic name of the refactoring
-         */
-        name: string;
-        /**
-         * A description of this refactoring category to show to the user.
-         * If the refactoring gets inlined (see below), this text will not be visible.
-         */
-        description: string;
-        /**
-         * Inlineable refactorings can have their actions hoisted out to the top level
-         * of a context menu. Non-inlineanable refactorings should always be shown inside
-         * their parent grouping.
-         *
-         * If not specified, this value is assumed to be 'true'
-         */
-        inlineable?: boolean;
-        actions: RefactorActionInfo[];
-    }
-    /**
-     * Represents a single refactoring action - for example, the "Extract Method..." refactor might
-     * offer several actions, each corresponding to a surround class or closure to extract into.
-     */
-    interface RefactorActionInfo {
-        /**
-         * The programmatic name of the refactoring action
-         */
-        name: string;
-        /**
-         * A description of this refactoring action to show to the user.
-         * If the parent refactoring is inlined away, this will be the only text shown,
-         * so this description should make sense by itself if the parent is inlineable=true
-         */
-        description: string;
-    }
-    /**
-     * A set of edits to make in response to a refactor action, plus an optional
-     * location where renaming should be invoked from
-     */
-    interface RefactorEditInfo {
-        edits: FileTextChanges[];
-        renameFilename?: string;
-        renameLocation?: number;
-        commands?: CodeActionCommand[];
-    }
-    interface TextInsertion {
-        newText: string;
-        /** The position in newText the caret should point to after the insertion. */
-        caretOffset: number;
-    }
-    interface DocumentSpan {
-        textSpan: TextSpan;
-        fileName: string;
-        /**
-         * If the span represents a location that was remapped (e.g. via a .d.ts.map file),
-         * then the original filename and span will be specified here
-         */
-        originalTextSpan?: TextSpan;
-        originalFileName?: string;
-    }
-    interface RenameLocation extends DocumentSpan {
-    }
-    interface ReferenceEntry extends DocumentSpan {
-        isWriteAccess: boolean;
-        isDefinition: boolean;
-        isInString?: true;
-    }
-    interface ImplementationLocation extends DocumentSpan {
-        kind: ScriptElementKind;
-        displayParts: SymbolDisplayPart[];
-    }
-    interface DocumentHighlights {
-        fileName: string;
-        highlightSpans: HighlightSpan[];
-    }
-    enum HighlightSpanKind {
-        none = "none",
-        definition = "definition",
-        reference = "reference",
-        writtenReference = "writtenReference"
-    }
-    interface HighlightSpan {
-        fileName?: string;
-        isInString?: true;
-        textSpan: TextSpan;
-        kind: HighlightSpanKind;
-    }
-    interface NavigateToItem {
-        name: string;
-        kind: ScriptElementKind;
-        kindModifiers: string;
-        matchKind: string;
-        isCaseSensitive: boolean;
-        fileName: string;
-        textSpan: TextSpan;
-        containerName: string;
-        containerKind: ScriptElementKind;
-    }
-    enum IndentStyle {
-        None = 0,
-        Block = 1,
-        Smart = 2
-    }
-    interface EditorOptions {
-        BaseIndentSize?: number;
-        IndentSize: number;
-        TabSize: number;
-        NewLineCharacter: string;
-        ConvertTabsToSpaces: boolean;
-        IndentStyle: IndentStyle;
-    }
-    interface EditorSettings {
-        baseIndentSize?: number;
-        indentSize?: number;
-        tabSize?: number;
-        newLineCharacter?: string;
-        convertTabsToSpaces?: boolean;
-        indentStyle?: IndentStyle;
-    }
-    interface FormatCodeOptions extends EditorOptions {
-        InsertSpaceAfterCommaDelimiter: boolean;
-        InsertSpaceAfterSemicolonInForStatements: boolean;
-        InsertSpaceBeforeAndAfterBinaryOperators: boolean;
-        InsertSpaceAfterConstructor?: boolean;
-        InsertSpaceAfterKeywordsInControlFlowStatements: boolean;
-        InsertSpaceAfterFunctionKeywordForAnonymousFunctions: boolean;
-        InsertSpaceAfterOpeningAndBeforeClosingNonemptyParenthesis: boolean;
-        InsertSpaceAfterOpeningAndBeforeClosingNonemptyBrackets: boolean;
-        InsertSpaceAfterOpeningAndBeforeClosingNonemptyBraces?: boolean;
-        InsertSpaceAfterOpeningAndBeforeClosingTemplateStringBraces: boolean;
-        InsertSpaceAfterOpeningAndBeforeClosingJsxExpressionBraces?: boolean;
-        InsertSpaceAfterTypeAssertion?: boolean;
-        InsertSpaceBeforeFunctionParenthesis?: boolean;
-        PlaceOpenBraceOnNewLineForFunctions: boolean;
-        PlaceOpenBraceOnNewLineForControlBlocks: boolean;
-        insertSpaceBeforeTypeAnnotation?: boolean;
-    }
-    interface FormatCodeSettings extends EditorSettings {
-        insertSpaceAfterCommaDelimiter?: boolean;
-        insertSpaceAfterSemicolonInForStatements?: boolean;
-        insertSpaceBeforeAndAfterBinaryOperators?: boolean;
-        insertSpaceAfterConstructor?: boolean;
-        insertSpaceAfterKeywordsInControlFlowStatements?: boolean;
-        insertSpaceAfterFunctionKeywordForAnonymousFunctions?: boolean;
-        insertSpaceAfterOpeningAndBeforeClosingNonemptyParenthesis?: boolean;
-        insertSpaceAfterOpeningAndBeforeClosingNonemptyBrackets?: boolean;
-        insertSpaceAfterOpeningAndBeforeClosingNonemptyBraces?: boolean;
-        insertSpaceAfterOpeningAndBeforeClosingTemplateStringBraces?: boolean;
-        insertSpaceAfterOpeningAndBeforeClosingJsxExpressionBraces?: boolean;
-        insertSpaceAfterTypeAssertion?: boolean;
-        insertSpaceBeforeFunctionParenthesis?: boolean;
-        placeOpenBraceOnNewLineForFunctions?: boolean;
-        placeOpenBraceOnNewLineForControlBlocks?: boolean;
-        insertSpaceBeforeTypeAnnotation?: boolean;
-        indentMultiLineObjectLiteralBeginningOnBlankLine?: boolean;
-    }
-    interface DefinitionInfo extends DocumentSpan {
-        kind: ScriptElementKind;
-        name: string;
-        containerKind: ScriptElementKind;
-        containerName: string;
-    }
-    interface DefinitionInfoAndBoundSpan {
-        definitions?: ReadonlyArray<DefinitionInfo>;
-        textSpan: TextSpan;
-    }
-    interface ReferencedSymbolDefinitionInfo extends DefinitionInfo {
-        displayParts: SymbolDisplayPart[];
-    }
-    interface ReferencedSymbol {
-        definition: ReferencedSymbolDefinitionInfo;
-        references: ReferenceEntry[];
-    }
-    enum SymbolDisplayPartKind {
-        aliasName = 0,
-        className = 1,
-        enumName = 2,
-        fieldName = 3,
-        interfaceName = 4,
-        keyword = 5,
-        lineBreak = 6,
-        numericLiteral = 7,
-        stringLiteral = 8,
-        localName = 9,
-        methodName = 10,
-        moduleName = 11,
-        operator = 12,
-        parameterName = 13,
-        propertyName = 14,
-        punctuation = 15,
-        space = 16,
-        text = 17,
-        typeParameterName = 18,
-        enumMemberName = 19,
-        functionName = 20,
-        regularExpressionLiteral = 21
-    }
-    interface SymbolDisplayPart {
-        text: string;
-        kind: string;
-    }
-    interface JSDocTagInfo {
-        name: string;
-        text?: string;
-    }
-    interface QuickInfo {
-        kind: ScriptElementKind;
-        kindModifiers: string;
-        textSpan: TextSpan;
-        displayParts?: SymbolDisplayPart[];
-        documentation?: SymbolDisplayPart[];
-        tags?: JSDocTagInfo[];
-    }
-    interface RenameInfo {
-        canRename: boolean;
-        localizedErrorMessage?: string;
-        displayName: string;
-        fullDisplayName: string;
-        kind: ScriptElementKind;
-        kindModifiers: string;
-        triggerSpan: TextSpan;
-    }
-    interface SignatureHelpParameter {
-        name: string;
-        documentation: SymbolDisplayPart[];
-        displayParts: SymbolDisplayPart[];
-        isOptional: boolean;
-    }
-    /**
-     * Represents a single signature to show in signature help.
-     * The id is used for subsequent calls into the language service to ask questions about the
-     * signature help item in the context of any documents that have been updated.  i.e. after
-     * an edit has happened, while signature help is still active, the host can ask important
-     * questions like 'what parameter is the user currently contained within?'.
-     */
-    interface SignatureHelpItem {
-        isVariadic: boolean;
-        prefixDisplayParts: SymbolDisplayPart[];
-        suffixDisplayParts: SymbolDisplayPart[];
-        separatorDisplayParts: SymbolDisplayPart[];
-        parameters: SignatureHelpParameter[];
-        documentation: SymbolDisplayPart[];
-        tags: JSDocTagInfo[];
-    }
-    /**
-     * Represents a set of signature help items, and the preferred item that should be selected.
-     */
-    interface SignatureHelpItems {
-        items: SignatureHelpItem[];
-        applicableSpan: TextSpan;
-        selectedItemIndex: number;
-        argumentIndex: number;
-        argumentCount: number;
-    }
-    interface CompletionInfo {
-        /** Not true for all glboal completions. This will be true if the enclosing scope matches a few syntax kinds. See `isSnippetScope`. */
-        isGlobalCompletion: boolean;
-        isMemberCompletion: boolean;
-        /**
-         * true when the current location also allows for a new identifier
-         */
-        isNewIdentifierLocation: boolean;
-        entries: CompletionEntry[];
-    }
-    interface CompletionEntry {
-        name: string;
-        kind: ScriptElementKind;
-        kindModifiers?: string;
-        sortText: string;
-        insertText?: string;
-        /**
-         * An optional span that indicates the text to be replaced by this completion item.
-         * If present, this span should be used instead of the default one.
-         * It will be set if the required span differs from the one generated by the default replacement behavior.
-         */
-        replacementSpan?: TextSpan;
-        hasAction?: true;
-        source?: string;
-        isRecommended?: true;
-    }
-    interface CompletionEntryDetails {
-        name: string;
-        kind: ScriptElementKind;
-        kindModifiers: string;
-        displayParts: SymbolDisplayPart[];
-        documentation?: SymbolDisplayPart[];
-        tags?: JSDocTagInfo[];
-        codeActions?: CodeAction[];
-        source?: SymbolDisplayPart[];
-    }
-    interface OutliningSpan {
-        /** The span of the document to actually collapse. */
-        textSpan: TextSpan;
-        /** The span of the document to display when the user hovers over the collapsed span. */
-        hintSpan: TextSpan;
-        /** The text to display in the editor for the collapsed region. */
-        bannerText: string;
-        /**
-         * Whether or not this region should be automatically collapsed when
-         * the 'Collapse to Definitions' command is invoked.
-         */
-        autoCollapse: boolean;
-        /**
-         * Classification of the contents of the span
-         */
-        kind: OutliningSpanKind;
-    }
-    enum OutliningSpanKind {
-        /** Single or multi-line comments */
-        Comment = "comment",
-        /** Sections marked by '// #region' and '// #endregion' comments */
-        Region = "region",
-        /** Declarations and expressions */
-        Code = "code",
-        /** Contiguous blocks of import declarations */
-        Imports = "imports"
-    }
-    enum OutputFileType {
-        JavaScript = 0,
-        SourceMap = 1,
-        Declaration = 2
-    }
-    enum EndOfLineState {
-        None = 0,
-        InMultiLineCommentTrivia = 1,
-        InSingleQuoteStringLiteral = 2,
-        InDoubleQuoteStringLiteral = 3,
-        InTemplateHeadOrNoSubstitutionTemplate = 4,
-        InTemplateMiddleOrTail = 5,
-        InTemplateSubstitutionPosition = 6
-    }
-    enum TokenClass {
-        Punctuation = 0,
-        Keyword = 1,
-        Operator = 2,
-        Comment = 3,
-        Whitespace = 4,
-        Identifier = 5,
-        NumberLiteral = 6,
-        StringLiteral = 7,
-        RegExpLiteral = 8
-    }
-    interface ClassificationResult {
-        finalLexState: EndOfLineState;
-        entries: ClassificationInfo[];
-    }
-    interface ClassificationInfo {
-        length: number;
-        classification: TokenClass;
-    }
-    interface Classifier {
-        /**
-         * Gives lexical classifications of tokens on a line without any syntactic context.
-         * For instance, a token consisting of the text 'string' can be either an identifier
-         * named 'string' or the keyword 'string', however, because this classifier is not aware,
-         * it relies on certain heuristics to give acceptable results. For classifications where
-         * speed trumps accuracy, this function is preferable; however, for true accuracy, the
-         * syntactic classifier is ideal. In fact, in certain editing scenarios, combining the
-         * lexical, syntactic, and semantic classifiers may issue the best user experience.
-         *
-         * @param text                      The text of a line to classify.
-         * @param lexState                  The state of the lexical classifier at the end of the previous line.
-         * @param syntacticClassifierAbsent Whether the client is *not* using a syntactic classifier.
-         *                                  If there is no syntactic classifier (syntacticClassifierAbsent=true),
-         *                                  certain heuristics may be used in its place; however, if there is a
-         *                                  syntactic classifier (syntacticClassifierAbsent=false), certain
-         *                                  classifications which may be incorrectly categorized will be given
-         *                                  back as Identifiers in order to allow the syntactic classifier to
-         *                                  subsume the classification.
-         * @deprecated Use getLexicalClassifications instead.
-         */
-        getClassificationsForLine(text: string, lexState: EndOfLineState, syntacticClassifierAbsent: boolean): ClassificationResult;
-        getEncodedLexicalClassifications(text: string, endOfLineState: EndOfLineState, syntacticClassifierAbsent: boolean): Classifications;
-    }
-    enum ScriptElementKind {
-        unknown = "",
-        warning = "warning",
-        /** predefined type (void) or keyword (class) */
-        keyword = "keyword",
-        /** top level script node */
-        scriptElement = "script",
-        /** module foo {} */
-        moduleElement = "module",
-        /** class X {} */
-        classElement = "class",
-        /** var x = class X {} */
-        localClassElement = "local class",
-        /** interface Y {} */
-        interfaceElement = "interface",
-        /** type T = ... */
-        typeElement = "type",
-        /** enum E */
-        enumElement = "enum",
-        enumMemberElement = "enum member",
-        /**
-         * Inside module and script only
-         * const v = ..
-         */
-        variableElement = "var",
-        /** Inside function */
-        localVariableElement = "local var",
-        /**
-         * Inside module and script only
-         * function f() { }
-         */
-        functionElement = "function",
-        /** Inside function */
-        localFunctionElement = "local function",
-        /** class X { [public|private]* foo() {} } */
-        memberFunctionElement = "method",
-        /** class X { [public|private]* [get|set] foo:number; } */
-        memberGetAccessorElement = "getter",
-        memberSetAccessorElement = "setter",
-        /**
-         * class X { [public|private]* foo:number; }
-         * interface Y { foo:number; }
-         */
-        memberVariableElement = "property",
-        /** class X { constructor() { } } */
-        constructorImplementationElement = "constructor",
-        /** interface Y { ():number; } */
-        callSignatureElement = "call",
-        /** interface Y { []:number; } */
-        indexSignatureElement = "index",
-        /** interface Y { new():Y; } */
-        constructSignatureElement = "construct",
-        /** function foo(*Y*: string) */
-        parameterElement = "parameter",
-        typeParameterElement = "type parameter",
-        primitiveType = "primitive type",
-        label = "label",
-        alias = "alias",
-        constElement = "const",
-        letElement = "let",
-        directory = "directory",
-        externalModuleName = "external module name",
-        /**
-         * <JsxTagName attribute1 attribute2={0} />
-         */
-        jsxAttribute = "JSX attribute",
-        /** String literal */
-        string = "string"
-    }
-    enum ScriptElementKindModifier {
-        none = "",
-        publicMemberModifier = "public",
-        privateMemberModifier = "private",
-        protectedMemberModifier = "protected",
-        exportedModifier = "export",
-        ambientModifier = "declare",
-        staticModifier = "static",
-        abstractModifier = "abstract",
-        optionalModifier = "optional"
-    }
-    enum ClassificationTypeNames {
-        comment = "comment",
-        identifier = "identifier",
-        keyword = "keyword",
-        numericLiteral = "number",
-        operator = "operator",
-        stringLiteral = "string",
-        whiteSpace = "whitespace",
-        text = "text",
-        punctuation = "punctuation",
-        className = "class name",
-        enumName = "enum name",
-        interfaceName = "interface name",
-        moduleName = "module name",
-        typeParameterName = "type parameter name",
-        typeAliasName = "type alias name",
-        parameterName = "parameter name",
-        docCommentTagName = "doc comment tag name",
-        jsxOpenTagName = "jsx open tag name",
-        jsxCloseTagName = "jsx close tag name",
-        jsxSelfClosingTagName = "jsx self closing tag name",
-        jsxAttribute = "jsx attribute",
-        jsxText = "jsx text",
-        jsxAttributeStringLiteralValue = "jsx attribute string literal value"
-    }
-    enum ClassificationType {
-        comment = 1,
-        identifier = 2,
-        keyword = 3,
-        numericLiteral = 4,
-        operator = 5,
-        stringLiteral = 6,
-        regularExpressionLiteral = 7,
-        whiteSpace = 8,
-        text = 9,
-        punctuation = 10,
-        className = 11,
-        enumName = 12,
-        interfaceName = 13,
-        moduleName = 14,
-        typeParameterName = 15,
-        typeAliasName = 16,
-        parameterName = 17,
-        docCommentTagName = 18,
-        jsxOpenTagName = 19,
-        jsxCloseTagName = 20,
-        jsxSelfClosingTagName = 21,
-        jsxAttribute = 22,
-        jsxText = 23,
-        jsxAttributeStringLiteralValue = 24
-    }
-}
-declare namespace ts {
-    function createClassifier(): Classifier;
-}
-declare namespace ts {
-    /**
-     * The document registry represents a store of SourceFile objects that can be shared between
-     * multiple LanguageService instances. A LanguageService instance holds on the SourceFile (AST)
-     * of files in the context.
-     * SourceFile objects account for most of the memory usage by the language service. Sharing
-     * the same DocumentRegistry instance between different instances of LanguageService allow
-     * for more efficient memory utilization since all projects will share at least the library
-     * file (lib.d.ts).
-     *
-     * A more advanced use of the document registry is to serialize sourceFile objects to disk
-     * and re-hydrate them when needed.
-     *
-     * To create a default DocumentRegistry, use createDocumentRegistry to create one, and pass it
-     * to all subsequent createLanguageService calls.
-     */
-    interface DocumentRegistry {
-        /**
-         * Request a stored SourceFile with a given fileName and compilationSettings.
-         * The first call to acquire will call createLanguageServiceSourceFile to generate
-         * the SourceFile if was not found in the registry.
-         *
-         * @param fileName The name of the file requested
-         * @param compilationSettings Some compilation settings like target affects the
-         * shape of a the resulting SourceFile. This allows the DocumentRegistry to store
-         * multiple copies of the same file for different compilation settings.
-         * @param scriptSnapshot Text of the file. Only used if the file was not found
-         * in the registry and a new one was created.
-         * @param version Current version of the file. Only used if the file was not found
-         * in the registry and a new one was created.
-         */
-        acquireDocument(fileName: string, compilationSettings: CompilerOptions, scriptSnapshot: IScriptSnapshot, version: string, scriptKind?: ScriptKind): SourceFile;
-        acquireDocumentWithKey(fileName: string, path: Path, compilationSettings: CompilerOptions, key: DocumentRegistryBucketKey, scriptSnapshot: IScriptSnapshot, version: string, scriptKind?: ScriptKind): SourceFile;
-        /**
-         * Request an updated version of an already existing SourceFile with a given fileName
-         * and compilationSettings. The update will in-turn call updateLanguageServiceSourceFile
-         * to get an updated SourceFile.
-         *
-         * @param fileName The name of the file requested
-         * @param compilationSettings Some compilation settings like target affects the
-         * shape of a the resulting SourceFile. This allows the DocumentRegistry to store
-         * multiple copies of the same file for different compilation settings.
-         * @param scriptSnapshot Text of the file.
-         * @param version Current version of the file.
-         */
-        updateDocument(fileName: string, compilationSettings: CompilerOptions, scriptSnapshot: IScriptSnapshot, version: string, scriptKind?: ScriptKind): SourceFile;
-        updateDocumentWithKey(fileName: string, path: Path, compilationSettings: CompilerOptions, key: DocumentRegistryBucketKey, scriptSnapshot: IScriptSnapshot, version: string, scriptKind?: ScriptKind): SourceFile;
-        getKeyForCompilationSettings(settings: CompilerOptions): DocumentRegistryBucketKey;
-        /**
-         * Informs the DocumentRegistry that a file is not needed any longer.
-         *
-         * Note: It is not allowed to call release on a SourceFile that was not acquired from
-         * this registry originally.
-         *
-         * @param fileName The name of the file to be released
-         * @param compilationSettings The compilation settings used to acquire the file
-         */
-        releaseDocument(fileName: string, compilationSettings: CompilerOptions): void;
-        releaseDocumentWithKey(path: Path, key: DocumentRegistryBucketKey): void;
-        reportStats(): string;
-    }
-    type DocumentRegistryBucketKey = string & {
-        __bucketKey: any;
-    };
-    function createDocumentRegistry(useCaseSensitiveFileNames?: boolean, currentDirectory?: string): DocumentRegistry;
-}
-declare namespace ts {
-    function preProcessFile(sourceText: string, readImportFiles?: boolean, detectJavaScriptImports?: boolean): PreProcessedFileInfo;
-}
-declare namespace ts {
-    interface TranspileOptions {
-        compilerOptions?: CompilerOptions;
-        fileName?: string;
-        reportDiagnostics?: boolean;
-        moduleName?: string;
-        renamedDependencies?: MapLike<string>;
-        transformers?: CustomTransformers;
-    }
-    interface TranspileOutput {
-        outputText: string;
-        diagnostics?: Diagnostic[];
-        sourceMapText?: string;
-    }
-    function transpileModule(input: string, transpileOptions: TranspileOptions): TranspileOutput;
-    function transpile(input: string, compilerOptions?: CompilerOptions, fileName?: string, diagnostics?: Diagnostic[], moduleName?: string): string;
-}
-declare namespace ts {
-    /** The version of the language service API */
-    const servicesVersion = "0.8";
-    function toEditorSettings(options: EditorOptions | EditorSettings): EditorSettings;
-    function displayPartsToString(displayParts: SymbolDisplayPart[] | undefined): string;
-    function getDefaultCompilerOptions(): CompilerOptions;
-    function getSupportedCodeFixes(): string[];
-    function createLanguageServiceSourceFile(fileName: string, scriptSnapshot: IScriptSnapshot, scriptTarget: ScriptTarget, version: string, setNodeParents: boolean, scriptKind?: ScriptKind): SourceFile;
-    let disableIncrementalParsing: boolean;
-    function updateLanguageServiceSourceFile(sourceFile: SourceFile, scriptSnapshot: IScriptSnapshot, version: string, textChangeRange: TextChangeRange | undefined, aggressiveChecks?: boolean): SourceFile;
-    function createLanguageService(host: LanguageServiceHost, documentRegistry?: DocumentRegistry, syntaxOnly?: boolean): LanguageService;
-    /**
-     * Get the path of the default library files (lib.d.ts) as distributed with the typescript
-     * node package.
-     * The functionality is not supported if the ts module is consumed outside of a node module.
-     */
-    function getDefaultLibFilePath(options: CompilerOptions): string;
-}
-declare namespace ts {
-    /**
-     * Transform one or more nodes using the supplied transformers.
-     * @param source A single `Node` or an array of `Node` objects.
-     * @param transformers An array of `TransformerFactory` callbacks used to process the transformation.
-     * @param compilerOptions Optional compiler options.
-     */
-    function transform<T extends Node>(source: T | T[], transformers: TransformerFactory<T>[], compilerOptions?: CompilerOptions): TransformationResult<T>;
-}
-
+declare namespace ts {
+    /** Gets a timestamp with (at least) ms resolution */
+    const timestamp: () => number;
+}
+/** Performance measurements for the compiler. */
+declare namespace ts.performance {
+    /**
+     * Marks a performance event.
+     *
+     * @param markName The name of the mark.
+     */
+    function mark(markName: string): void;
+    /**
+     * Adds a performance measurement with the specified name.
+     *
+     * @param measureName The name of the performance measurement.
+     * @param startMarkName The name of the starting mark. If not supplied, the point at which the
+     *      profiler was enabled is used.
+     * @param endMarkName The name of the ending mark. If not supplied, the current timestamp is
+     *      used.
+     */
+    function measure(measureName: string, startMarkName?: string, endMarkName?: string): void;
+    /**
+     * Gets the number of times a marker was encountered.
+     *
+     * @param markName The name of the mark.
+     */
+    function getCount(markName: string): number;
+    /**
+     * Gets the total duration of all measurements with the supplied name.
+     *
+     * @param measureName The name of the measure whose durations should be accumulated.
+     */
+    function getDuration(measureName: string): number;
+    /**
+     * Iterate over each measure, performing some action
+     *
+     * @param cb The action to perform for each measure
+     */
+    function forEachMeasure(cb: (measureName: string, duration: number) => void): void;
+    /** Enables (and resets) performance measurements for the compiler. */
+    function enable(): void;
+    /** Disables performance measurements for the compiler. */
+    function disable(): void;
+}
+declare namespace ts {
+    const versionMajorMinor = "3.0";
+    /** The version of the TypeScript compiler release */
+    const version: string;
+}
+declare namespace ts {
+    /**
+     * Type of objects whose values are all of the same type.
+     * The `in` and `for-in` operators can *not* be safely used,
+     * since `Object.prototype` may be modified by outside code.
+     */
+    interface MapLike<T> {
+        [index: string]: T;
+    }
+    interface SortedArray<T> extends Array<T> {
+        " __sortedArrayBrand": any;
+    }
+}
+declare namespace ts {
+    type EqualityComparer<T> = (a: T, b: T) => boolean;
+    type Comparer<T> = (a: T, b: T) => Comparison;
+    enum Comparison {
+        LessThan = -1,
+        EqualTo = 0,
+        GreaterThan = 1
+    }
+    /** ES6 Map interface, only read methods included. */
+    interface ReadonlyMap<T> {
+        get(key: string): T | undefined;
+        has(key: string): boolean;
+        forEach(action: (value: T, key: string) => void): void;
+        readonly size: number;
+        keys(): Iterator<string>;
+        values(): Iterator<T>;
+        entries(): Iterator<[string, T]>;
+    }
+    /** ES6 Map interface. */
+    interface Map<T> extends ReadonlyMap<T> {
+        set(key: string, value: T): this;
+        delete(key: string): boolean;
+        clear(): void;
+    }
+    /** ES6 Iterator type. */
+    interface Iterator<T> {
+        next(): {
+            value: T;
+            done: false;
+        } | {
+            value: never;
+            done: true;
+        };
+    }
+    /** Array that is only intended to be pushed to, never read. */
+    interface Push<T> {
+        push(...values: T[]): void;
+    }
+    /** Create a new map. If a template object is provided, the map will copy entries from it. */
+    function createMap<T>(): Map<T>;
+    function createMapFromEntries<T>(entries: [string, T][]): Map<T>;
+    function createMapFromTemplate<T>(template: MapLike<T>): Map<T>;
+    const MapCtr: new <T>() => Map<T>;
+    function length(array: ReadonlyArray<any> | undefined): number;
+    /**
+     * Iterates through 'array' by index and performs the callback on each element of array until the callback
+     * returns a truthy value, then returns that value.
+     * If no such value is found, the callback is applied to each element of array and undefined is returned.
+     */
+    function forEach<T, U>(array: ReadonlyArray<T> | undefined, callback: (element: T, index: number) => U | undefined): U | undefined;
+    /** Like `forEach`, but suitable for use with numbers and strings (which may be falsy). */
+    function firstDefined<T, U>(array: ReadonlyArray<T> | undefined, callback: (element: T, index: number) => U | undefined): U | undefined;
+    function firstDefinedIterator<T, U>(iter: Iterator<T>, callback: (element: T) => U | undefined): U | undefined;
+    function zipWith<T, U, V>(arrayA: ReadonlyArray<T>, arrayB: ReadonlyArray<U>, callback: (a: T, b: U, index: number) => V): V[];
+    function zipToIterator<T, U>(arrayA: ReadonlyArray<T>, arrayB: ReadonlyArray<U>): Iterator<[T, U]>;
+    function zipToMap<T>(keys: ReadonlyArray<string>, values: ReadonlyArray<T>): Map<T>;
+    /**
+     * Iterates through `array` by index and performs the callback on each element of array until the callback
+     * returns a falsey value, then returns false.
+     * If no such value is found, the callback is applied to each element of array and `true` is returned.
+     */
+    function every<T>(array: ReadonlyArray<T>, callback: (element: T, index: number) => boolean): boolean;
+    /** Works like Array.prototype.find, returning `undefined` if no element satisfying the predicate is found. */
+    function find<T, U extends T>(array: ReadonlyArray<T>, predicate: (element: T, index: number) => element is U): U | undefined;
+    function find<T>(array: ReadonlyArray<T>, predicate: (element: T, index: number) => boolean): T | undefined;
+    function findLast<T, U extends T>(array: ReadonlyArray<T>, predicate: (element: T, index: number) => element is U): U | undefined;
+    function findLast<T>(array: ReadonlyArray<T>, predicate: (element: T, index: number) => boolean): T | undefined;
+    /** Works like Array.prototype.findIndex, returning `-1` if no element satisfying the predicate is found. */
+    function findIndex<T>(array: ReadonlyArray<T>, predicate: (element: T, index: number) => boolean, startIndex?: number): number;
+    function findLastIndex<T>(array: ReadonlyArray<T>, predicate: (element: T, index: number) => boolean, startIndex?: number): number;
+    /**
+     * Returns the first truthy result of `callback`, or else fails.
+     * This is like `forEach`, but never returns undefined.
+     */
+    function findMap<T, U>(array: ReadonlyArray<T>, callback: (element: T, index: number) => U | undefined): U;
+    function contains<T>(array: ReadonlyArray<T> | undefined, value: T, equalityComparer?: EqualityComparer<T>): boolean;
+    function arraysEqual<T>(a: ReadonlyArray<T>, b: ReadonlyArray<T>, equalityComparer?: EqualityComparer<T>): boolean;
+    function indexOfAnyCharCode(text: string, charCodes: ReadonlyArray<number>, start?: number): number;
+    function countWhere<T>(array: ReadonlyArray<T>, predicate: (x: T, i: number) => boolean): number;
+    /**
+     * Filters an array by a predicate function. Returns the same array instance if the predicate is
+     * true for all elements, otherwise returns a new array instance containing the filtered subset.
+     */
+    function filter<T, U extends T>(array: T[], f: (x: T) => x is U): U[];
+    function filter<T>(array: T[], f: (x: T) => boolean): T[];
+    function filter<T, U extends T>(array: ReadonlyArray<T>, f: (x: T) => x is U): ReadonlyArray<U>;
+    function filter<T, U extends T>(array: ReadonlyArray<T>, f: (x: T) => boolean): ReadonlyArray<T>;
+    function filter<T, U extends T>(array: T[] | undefined, f: (x: T) => x is U): U[] | undefined;
+    function filter<T>(array: T[] | undefined, f: (x: T) => boolean): T[] | undefined;
+    function filter<T, U extends T>(array: ReadonlyArray<T> | undefined, f: (x: T) => x is U): ReadonlyArray<U> | undefined;
+    function filter<T, U extends T>(array: ReadonlyArray<T> | undefined, f: (x: T) => boolean): ReadonlyArray<T> | undefined;
+    function filterMutate<T>(array: T[], f: (x: T, i: number, array: T[]) => boolean): void;
+    function clear(array: {}[]): void;
+    function map<T, U>(array: ReadonlyArray<T>, f: (x: T, i: number) => U): U[];
+    function map<T, U>(array: ReadonlyArray<T> | undefined, f: (x: T, i: number) => U): U[] | undefined;
+    function mapIterator<T, U>(iter: Iterator<T>, mapFn: (x: T) => U): Iterator<U>;
+    function sameMap<T>(array: T[], f: (x: T, i: number) => T): T[];
+    function sameMap<T>(array: ReadonlyArray<T>, f: (x: T, i: number) => T): ReadonlyArray<T>;
+    function sameMap<T>(array: T[] | undefined, f: (x: T, i: number) => T): T[] | undefined;
+    function sameMap<T>(array: ReadonlyArray<T> | undefined, f: (x: T, i: number) => T): ReadonlyArray<T> | undefined;
+    /**
+     * Flattens an array containing a mix of array or non-array elements.
+     *
+     * @param array The array to flatten.
+     */
+    function flatten<T>(array: ReadonlyArray<T | ReadonlyArray<T> | undefined>): T[];
+    function flatten<T>(array: ReadonlyArray<T | ReadonlyArray<T> | undefined> | undefined): T[] | undefined;
+    /**
+     * Maps an array. If the mapped value is an array, it is spread into the result.
+     *
+     * @param array The array to map.
+     * @param mapfn The callback used to map the result into one or more values.
+     */
+    function flatMap<T, U>(array: ReadonlyArray<T>, mapfn: (x: T, i: number) => U | ReadonlyArray<U> | undefined): U[];
+    function flatMap<T, U>(array: ReadonlyArray<T> | undefined, mapfn: (x: T, i: number) => U | ReadonlyArray<U> | undefined): U[] | undefined;
+    function flatMapIterator<T, U>(iter: Iterator<T>, mapfn: (x: T) => U[] | Iterator<U> | undefined): Iterator<U>;
+    /**
+     * Maps an array. If the mapped value is an array, it is spread into the result.
+     * Avoids allocation if all elements map to themselves.
+     *
+     * @param array The array to map.
+     * @param mapfn The callback used to map the result into one or more values.
+     */
+    function sameFlatMap<T>(array: T[], mapfn: (x: T, i: number) => T | ReadonlyArray<T>): T[];
+    function sameFlatMap<T>(array: ReadonlyArray<T>, mapfn: (x: T, i: number) => T | ReadonlyArray<T>): ReadonlyArray<T>;
+    function mapAllOrFail<T, U>(array: ReadonlyArray<T>, mapFn: (x: T, i: number) => U | undefined): U[] | undefined;
+    function mapDefined<T, U>(array: ReadonlyArray<T> | undefined, mapFn: (x: T, i: number) => U | undefined): U[];
+    function mapDefinedIterator<T, U>(iter: Iterator<T>, mapFn: (x: T) => U | undefined): Iterator<U>;
+    const emptyIterator: Iterator<never>;
+    function singleIterator<T>(value: T): Iterator<T>;
+    /**
+     * Maps contiguous spans of values with the same key.
+     *
+     * @param array The array to map.
+     * @param keyfn A callback used to select the key for an element.
+     * @param mapfn A callback used to map a contiguous chunk of values to a single value.
+     */
+    function spanMap<T, K, U>(array: ReadonlyArray<T>, keyfn: (x: T, i: number) => K, mapfn: (chunk: T[], key: K, start: number, end: number) => U): U[];
+    function spanMap<T, K, U>(array: ReadonlyArray<T> | undefined, keyfn: (x: T, i: number) => K, mapfn: (chunk: T[], key: K, start: number, end: number) => U): U[] | undefined;
+    function mapEntries<T, U>(map: ReadonlyMap<T>, f: (key: string, value: T) => [string, U]): Map<U>;
+    function mapEntries<T, U>(map: ReadonlyMap<T> | undefined, f: (key: string, value: T) => [string, U]): Map<U> | undefined;
+    function some<T>(array: ReadonlyArray<T> | undefined): array is ReadonlyArray<T>;
+    function some<T>(array: ReadonlyArray<T> | undefined, predicate: (value: T) => boolean): boolean;
+    /** Calls the callback with (start, afterEnd) index pairs for each range where 'pred' is true. */
+    function getRangesWhere<T>(arr: ReadonlyArray<T>, pred: (t: T) => boolean, cb: (start: number, afterEnd: number) => void): void;
+    function concatenate<T>(array1: T[], array2: T[]): T[];
+    function concatenate<T>(array1: ReadonlyArray<T>, array2: ReadonlyArray<T>): ReadonlyArray<T>;
+    function concatenate<T>(array1: T[] | undefined, array2: T[] | undefined): T[];
+    function concatenate<T>(array1: ReadonlyArray<T> | undefined, array2: ReadonlyArray<T> | undefined): ReadonlyArray<T>;
+    /**
+     * Deduplicates an unsorted array.
+     * @param equalityComparer An optional `EqualityComparer` used to determine if two values are duplicates.
+     * @param comparer An optional `Comparer` used to sort entries before comparison, though the
+     * result will remain in the original order in `array`.
+     */
+    function deduplicate<T>(array: ReadonlyArray<T>, equalityComparer?: EqualityComparer<T>, comparer?: Comparer<T>): T[];
+    function deduplicate<T>(array: ReadonlyArray<T> | undefined, equalityComparer?: EqualityComparer<T>, comparer?: Comparer<T>): T[] | undefined;
+    function insertSorted<T>(array: SortedArray<T>, insert: T, compare: Comparer<T>): void;
+    function sortAndDeduplicate<T>(array: ReadonlyArray<T>, comparer: Comparer<T>, equalityComparer?: EqualityComparer<T>): T[];
+    function arrayIsEqualTo<T>(array1: ReadonlyArray<T> | undefined, array2: ReadonlyArray<T> | undefined, equalityComparer?: (a: T, b: T) => boolean): boolean;
+    /**
+     * Compacts an array, removing any falsey elements.
+     */
+    function compact<T>(array: T[]): T[];
+    function compact<T>(array: ReadonlyArray<T>): ReadonlyArray<T>;
+    /**
+     * Gets the relative complement of `arrayA` with respect to `arrayB`, returning the elements that
+     * are not present in `arrayA` but are present in `arrayB`. Assumes both arrays are sorted
+     * based on the provided comparer.
+     */
+    function relativeComplement<T>(arrayA: T[] | undefined, arrayB: T[] | undefined, comparer: Comparer<T>): T[] | undefined;
+    function sum<T extends Record<K, number>, K extends string>(array: ReadonlyArray<T>, prop: K): number;
+    /**
+     * Appends a value to an array, returning the array.
+     *
+     * @param to The array to which `value` is to be appended. If `to` is `undefined`, a new array
+     * is created if `value` was appended.
+     * @param value The value to append to the array. If `value` is `undefined`, nothing is
+     * appended.
+     */
+    function append<T>(to: T[], value: T | undefined): T[];
+    function append<T>(to: T[] | undefined, value: T): T[];
+    function append<T>(to: T[] | undefined, value: T | undefined): T[] | undefined;
+    function append<T>(to: Push<T>, value: T | undefined): void;
+    /**
+     * Appends a range of value to an array, returning the array.
+     *
+     * @param to The array to which `value` is to be appended. If `to` is `undefined`, a new array
+     * is created if `value` was appended.
+     * @param from The values to append to the array. If `from` is `undefined`, nothing is
+     * appended. If an element of `from` is `undefined`, that element is not appended.
+     * @param start The offset in `from` at which to start copying values.
+     * @param end The offset in `from` at which to stop copying values (non-inclusive).
+     */
+    function addRange<T>(to: T[], from: ReadonlyArray<T> | undefined, start?: number, end?: number): T[];
+    function addRange<T>(to: T[] | undefined, from: ReadonlyArray<T> | undefined, start?: number, end?: number): T[] | undefined;
+    /**
+     * @return Whether the value was added.
+     */
+    function pushIfUnique<T>(array: T[], toAdd: T, equalityComparer?: EqualityComparer<T>): boolean;
+    /**
+     * Unlike `pushIfUnique`, this can take `undefined` as an input, and returns a new array.
+     */
+    function appendIfUnique<T>(array: T[] | undefined, toAdd: T, equalityComparer?: EqualityComparer<T>): T[];
+    /**
+     * Returns a new sorted array.
+     */
+    function sort<T>(array: ReadonlyArray<T>, comparer: Comparer<T>): T[];
+    function best<T>(iter: Iterator<T>, isBetter: (a: T, b: T) => boolean): T | undefined;
+    function arrayIterator<T>(array: ReadonlyArray<T>): Iterator<T>;
+    /**
+     * Stable sort of an array. Elements equal to each other maintain their relative position in the array.
+     */
+    function stableSort<T>(array: ReadonlyArray<T>, comparer: Comparer<T>): T[];
+    function rangeEquals<T>(array1: ReadonlyArray<T>, array2: ReadonlyArray<T>, pos: number, end: number): boolean;
+    /**
+     * Returns the element at a specific offset in an array if non-empty, `undefined` otherwise.
+     * A negative offset indicates the element should be retrieved from the end of the array.
+     */
+    function elementAt<T>(array: ReadonlyArray<T> | undefined, offset: number): T | undefined;
+    /**
+     * Returns the first element of an array if non-empty, `undefined` otherwise.
+     */
+    function firstOrUndefined<T>(array: ReadonlyArray<T>): T | undefined;
+    function first<T>(array: ReadonlyArray<T>): T;
+    /**
+     * Returns the last element of an array if non-empty, `undefined` otherwise.
+     */
+    function lastOrUndefined<T>(array: ReadonlyArray<T>): T | undefined;
+    function last<T>(array: ReadonlyArray<T>): T;
+    /**
+     * Returns the only element of an array if it contains only one element, `undefined` otherwise.
+     */
+    function singleOrUndefined<T>(array: ReadonlyArray<T> | undefined): T | undefined;
+    /**
+     * Returns the only element of an array if it contains only one element; otheriwse, returns the
+     * array.
+     */
+    function singleOrMany<T>(array: T[]): T | T[];
+    function singleOrMany<T>(array: ReadonlyArray<T>): T | ReadonlyArray<T>;
+    function singleOrMany<T>(array: T[] | undefined): T | T[] | undefined;
+    function singleOrMany<T>(array: ReadonlyArray<T> | undefined): T | ReadonlyArray<T> | undefined;
+    function replaceElement<T>(array: ReadonlyArray<T>, index: number, value: T): T[];
+    /**
+     * Performs a binary search, finding the index at which `value` occurs in `array`.
+     * If no such index is found, returns the 2's-complement of first index at which
+     * `array[index]` exceeds `value`.
+     * @param array A sorted array whose first element must be no larger than number
+     * @param value The value to be searched for in the array.
+     * @param keySelector A callback used to select the search key from `value` and each element of
+     * `array`.
+     * @param keyComparer A callback used to compare two keys in a sorted array.
+     * @param offset An offset into `array` at which to start the search.
+     */
+    function binarySearch<T, U>(array: ReadonlyArray<T>, value: T, keySelector: (v: T) => U, keyComparer: Comparer<U>, offset?: number): number;
+    function reduceLeft<T, U>(array: ReadonlyArray<T> | undefined, f: (memo: U, value: T, i: number) => U, initial: U, start?: number, count?: number): U;
+    function reduceLeft<T>(array: ReadonlyArray<T>, f: (memo: T, value: T, i: number) => T): T | undefined;
+    /**
+     * Indicates whether a map-like contains an own property with the specified key.
+     *
+     * @param map A map-like.
+     * @param key A property key.
+     */
+    function hasProperty(map: MapLike<any>, key: string): boolean;
+    /**
+     * Gets the value of an owned property in a map-like.
+     *
+     * @param map A map-like.
+     * @param key A property key.
+     */
+    function getProperty<T>(map: MapLike<T>, key: string): T | undefined;
+    /**
+     * Gets the owned, enumerable property keys of a map-like.
+     */
+    function getOwnKeys<T>(map: MapLike<T>): string[];
+    function getOwnValues<T>(sparseArray: T[]): T[];
+    /** Shims `Array.from`. */
+    function arrayFrom<T, U>(iterator: Iterator<T>, map: (t: T) => U): U[];
+    function arrayFrom<T>(iterator: Iterator<T>): T[];
+    function assign<T extends object>(t: T, ...args: (T | undefined)[]): T;
+    /**
+     * Performs a shallow equality comparison of the contents of two map-likes.
+     *
+     * @param left A map-like whose properties should be compared.
+     * @param right A map-like whose properties should be compared.
+     */
+    function equalOwnProperties<T>(left: MapLike<T> | undefined, right: MapLike<T> | undefined, equalityComparer?: EqualityComparer<T>): boolean;
+    /**
+     * Creates a map from the elements of an array.
+     *
+     * @param array the array of input elements.
+     * @param makeKey a function that produces a key for a given element.
+     *
+     * This function makes no effort to avoid collisions; if any two elements produce
+     * the same key with the given 'makeKey' function, then the element with the higher
+     * index in the array will be the one associated with the produced key.
+     */
+    function arrayToMap<T>(array: ReadonlyArray<T>, makeKey: (value: T) => string | undefined): Map<T>;
+    function arrayToMap<T, U>(array: ReadonlyArray<T>, makeKey: (value: T) => string | undefined, makeValue: (value: T) => U): Map<U>;
+    function arrayToNumericMap<T>(array: ReadonlyArray<T>, makeKey: (value: T) => number): T[];
+    function arrayToNumericMap<T, U>(array: ReadonlyArray<T>, makeKey: (value: T) => number, makeValue: (value: T) => U): U[];
+    function arrayToMultiMap<T>(values: ReadonlyArray<T>, makeKey: (value: T) => string): MultiMap<T>;
+    function arrayToMultiMap<T, U>(values: ReadonlyArray<T>, makeKey: (value: T) => string, makeValue: (value: T) => U): MultiMap<U>;
+    function group<T>(values: ReadonlyArray<T>, getGroupId: (value: T) => string): ReadonlyArray<ReadonlyArray<T>>;
+    function clone<T>(object: T): T;
+    function extend<T1, T2>(first: T1, second: T2): T1 & T2;
+    interface MultiMap<T> extends Map<T[]> {
+        /**
+         * Adds the value to an array of values associated with the key, and returns the array.
+         * Creates the array if it does not already exist.
+         */
+        add(key: string, value: T): T[];
+        /**
+         * Removes a value from an array of values associated with the key.
+         * Does not preserve the order of those values.
+         * Does nothing if `key` is not in `map`, or `value` is not in `map[key]`.
+         */
+        remove(key: string, value: T): void;
+    }
+    function createMultiMap<T>(): MultiMap<T>;
+    /**
+     * Tests whether a value is an array.
+     */
+    function isArray(value: any): value is ReadonlyArray<{}>;
+    function toArray<T>(value: T | T[]): T[];
+    function toArray<T>(value: T | ReadonlyArray<T>): ReadonlyArray<T>;
+    /**
+     * Tests whether a value is string
+     */
+    function isString(text: any): text is string;
+    function tryCast<TOut extends TIn, TIn = any>(value: TIn | undefined, test: (value: TIn) => value is TOut): TOut | undefined;
+    function cast<TOut extends TIn, TIn = any>(value: TIn | undefined, test: (value: TIn) => value is TOut): TOut;
+    /** Does nothing. */
+    function noop(_?: {} | null | undefined): void;
+    /** Do nothing and return false */
+    function returnFalse(): false;
+    /** Do nothing and return true */
+    function returnTrue(): true;
+    /** Returns its argument. */
+    function identity<T>(x: T): T;
+    /** Returns lower case string */
+    function toLowerCase(x: string): string;
+    /** Throws an error because a function is not implemented. */
+    function notImplemented(): never;
+    function memoize<T>(callback: () => T): () => T;
+    /**
+     * High-order function, creates a function that executes a function composition.
+     * For example, `chain(a, b)` is the equivalent of `x => ((a', b') => y => b'(a'(y)))(a(x), b(x))`
+     *
+     * @param args The functions to chain.
+     */
+    function chain<T, U>(...args: ((t: T) => (u: U) => U)[]): (t: T) => (u: U) => U;
+    /**
+     * High-order function, composes functions. Note that functions are composed inside-out;
+     * for example, `compose(a, b)` is the equivalent of `x => b(a(x))`.
+     *
+     * @param args The functions to compose.
+     */
+    function compose<T>(...args: ((t: T) => T)[]): (t: T) => T;
+    enum AssertionLevel {
+        None = 0,
+        Normal = 1,
+        Aggressive = 2,
+        VeryAggressive = 3
+    }
+    /**
+     * Safer version of `Function` which should not be called.
+     * Every function should be assignable to this, but this should not be assignable to every function.
+     */
+    type AnyFunction = (...args: never[]) => void;
+    namespace Debug {
+        let currentAssertionLevel: AssertionLevel;
+        let isDebugging: boolean;
+        function shouldAssert(level: AssertionLevel): boolean;
+        function assert(expression: boolean, message?: string, verboseDebugInfo?: string | (() => string), stackCrawlMark?: AnyFunction): void;
+        function assertEqual<T>(a: T, b: T, msg?: string, msg2?: string): void;
+        function assertLessThan(a: number, b: number, msg?: string): void;
+        function assertLessThanOrEqual(a: number, b: number): void;
+        function assertGreaterThanOrEqual(a: number, b: number): void;
+        function fail(message?: string, stackCrawlMark?: AnyFunction): never;
+        function assertDefined<T>(value: T | null | undefined, message?: string): T;
+        function assertEachDefined<T, A extends ReadonlyArray<T>>(value: A, message?: string): A;
+        function assertNever(member: never, message?: string, stackCrawlMark?: AnyFunction): never;
+        function getFunctionName(func: AnyFunction): any;
+    }
+    function equateValues<T>(a: T, b: T): boolean;
+    /**
+     * Compare the equality of two strings using a case-sensitive ordinal comparison.
+     *
+     * Case-sensitive comparisons compare both strings one code-point at a time using the integer
+     * value of each code-point after applying `toUpperCase` to each string. We always map both
+     * strings to their upper-case form as some unicode characters do not properly round-trip to
+     * lowercase (such as `ẞ` (German sharp capital s)).
+     */
+    function equateStringsCaseInsensitive(a: string, b: string): boolean;
+    /**
+     * Compare the equality of two strings using a case-sensitive ordinal comparison.
+     *
+     * Case-sensitive comparisons compare both strings one code-point at a time using the
+     * integer value of each code-point.
+     */
+    function equateStringsCaseSensitive(a: string, b: string): boolean;
+    /**
+     * Compare two numeric values for their order relative to each other.
+     * To compare strings, use any of the `compareStrings` functions.
+     */
+    function compareValues(a: number | undefined, b: number | undefined): Comparison;
+    function min<T>(a: T, b: T, compare: Comparer<T>): T;
+    /**
+     * Compare two strings using a case-insensitive ordinal comparison.
+     *
+     * Ordinal comparisons are based on the difference between the unicode code points of both
+     * strings. Characters with multiple unicode representations are considered unequal. Ordinal
+     * comparisons provide predictable ordering, but place "a" after "B".
+     *
+     * Case-insensitive comparisons compare both strings one code-point at a time using the integer
+     * value of each code-point after applying `toUpperCase` to each string. We always map both
+     * strings to their upper-case form as some unicode characters do not properly round-trip to
+     * lowercase (such as `ẞ` (German sharp capital s)).
+     */
+    function compareStringsCaseInsensitive(a: string, b: string): Comparison;
+    /**
+     * Compare two strings using a case-sensitive ordinal comparison.
+     *
+     * Ordinal comparisons are based on the difference between the unicode code points of both
+     * strings. Characters with multiple unicode representations are considered unequal. Ordinal
+     * comparisons provide predictable ordering, but place "a" after "B".
+     *
+     * Case-sensitive comparisons compare both strings one code-point at a time using the integer
+     * value of each code-point.
+     */
+    function compareStringsCaseSensitive(a: string | undefined, b: string | undefined): Comparison;
+    function getStringComparer(ignoreCase?: boolean): typeof compareStringsCaseInsensitive;
+    function getUILocale(): string | undefined;
+    function setUILocale(value: string | undefined): void;
+    /**
+     * Compare two strings in a using the case-sensitive sort behavior of the UI locale.
+     *
+     * Ordering is not predictable between different host locales, but is best for displaying
+     * ordered data for UI presentation. Characters with multiple unicode representations may
+     * be considered equal.
+     *
+     * Case-sensitive comparisons compare strings that differ in base characters, or
+     * accents/diacritic marks, or case as unequal.
+     */
+    function compareStringsCaseSensitiveUI(a: string, b: string): Comparison;
+    function compareProperties<T, K extends keyof T>(a: T | undefined, b: T | undefined, key: K, comparer: Comparer<T[K]>): Comparison;
+    /** True is greater than false. */
+    function compareBooleans(a: boolean, b: boolean): Comparison;
+    /**
+     * Given a name and a list of names that are *not* equal to the name, return a spelling suggestion if there is one that is close enough.
+     * Names less than length 3 only check for case-insensitive equality, not Levenshtein distance.
+     *
+     * If there is a candidate that's the same except for case, return that.
+     * If there is a candidate that's within one edit of the name, return that.
+     * Otherwise, return the candidate with the smallest Levenshtein distance,
+     *    except for candidates:
+     *      * With no name
+     *      * Whose length differs from the target name by more than 0.34 of the length of the name.
+     *      * Whose levenshtein distance is more than 0.4 of the length of the name
+     *        (0.4 allows 1 substitution/transposition for every 5 characters,
+     *         and 1 insertion/deletion at 3 characters)
+     */
+    function getSpellingSuggestion<T>(name: string, candidates: T[], getName: (candidate: T) => string | undefined): T | undefined;
+    function endsWith(str: string, suffix: string): boolean;
+    function removeSuffix(str: string, suffix: string): string;
+    function tryRemoveSuffix(str: string, suffix: string): string | undefined;
+    function stringContains(str: string, substring: string): boolean;
+    function fileExtensionIs(path: string, extension: string): boolean;
+    function fileExtensionIsOneOf(path: string, extensions: ReadonlyArray<string>): boolean;
+    /**
+     * Takes a string like "jquery-min.4.2.3" and returns "jquery"
+     */
+    function removeMinAndVersionNumbers(fileName: string): string;
+    /** Remove an item from an array, moving everything to its right one space left. */
+    function orderedRemoveItem<T>(array: T[], item: T): boolean;
+    /** Remove an item by index from an array, moving everything to its right one space left. */
+    function orderedRemoveItemAt<T>(array: T[], index: number): void;
+    function unorderedRemoveItemAt<T>(array: T[], index: number): void;
+    /** Remove the *first* occurrence of `item` from the array. */
+    function unorderedRemoveItem<T>(array: T[], item: T): boolean;
+    type GetCanonicalFileName = (fileName: string) => string;
+    function createGetCanonicalFileName(useCaseSensitiveFileNames: boolean): GetCanonicalFileName;
+    /** Represents a "prefix*suffix" pattern. */
+    interface Pattern {
+        prefix: string;
+        suffix: string;
+    }
+    function patternText({ prefix, suffix }: Pattern): string;
+    /**
+     * Given that candidate matches pattern, returns the text matching the '*'.
+     * E.g.: matchedText(tryParsePattern("foo*baz"), "foobarbaz") === "bar"
+     */
+    function matchedText(pattern: Pattern, candidate: string): string;
+    /** Return the object corresponding to the best pattern to match `candidate`. */
+    function findBestPatternMatch<T>(values: ReadonlyArray<T>, getPattern: (value: T) => Pattern, candidate: string): T | undefined;
+    function startsWith(str: string, prefix: string): boolean;
+    function removePrefix(str: string, prefix: string): string;
+    function tryRemovePrefix(str: string, prefix: string): string | undefined;
+    function and<T>(f: (arg: T) => boolean, g: (arg: T) => boolean): (arg: T) => boolean;
+    function or<T>(f: (arg: T) => boolean, g: (arg: T) => boolean): (arg: T) => boolean;
+    function assertTypeIsNever(_: never): void;
+    function singleElementArray<T>(t: T | undefined): T[] | undefined;
+    function enumerateInsertsAndDeletes<T, U>(newItems: ReadonlyArray<T>, oldItems: ReadonlyArray<U>, comparer: (a: T, b: U) => Comparison, inserted: (newItem: T) => void, deleted: (oldItem: U) => void, unchanged?: (oldItem: U, newItem: T) => void): void;
+}
+//# sourceMappingURL=core.d.ts.map
+declare namespace ts {
+    type Path = string & {
+        __pathBrand: any;
+    };
+    interface TextRange {
+        pos: number;
+        end: number;
+    }
+    type JsDocSyntaxKind = SyntaxKind.EndOfFileToken | SyntaxKind.WhitespaceTrivia | SyntaxKind.AtToken | SyntaxKind.NewLineTrivia | SyntaxKind.AsteriskToken | SyntaxKind.OpenBraceToken | SyntaxKind.CloseBraceToken | SyntaxKind.LessThanToken | SyntaxKind.OpenBracketToken | SyntaxKind.CloseBracketToken | SyntaxKind.EqualsToken | SyntaxKind.CommaToken | SyntaxKind.DotToken | SyntaxKind.Identifier | SyntaxKind.NoSubstitutionTemplateLiteral | SyntaxKind.Unknown;
+    type JsxTokenSyntaxKind = SyntaxKind.LessThanSlashToken | SyntaxKind.EndOfFileToken | SyntaxKind.ConflictMarkerTrivia | SyntaxKind.JsxText | SyntaxKind.JsxTextAllWhiteSpaces | SyntaxKind.OpenBraceToken | SyntaxKind.LessThanToken;
+    enum SyntaxKind {
+        Unknown = 0,
+        EndOfFileToken = 1,
+        SingleLineCommentTrivia = 2,
+        MultiLineCommentTrivia = 3,
+        NewLineTrivia = 4,
+        WhitespaceTrivia = 5,
+        ShebangTrivia = 6,
+        ConflictMarkerTrivia = 7,
+        NumericLiteral = 8,
+        StringLiteral = 9,
+        JsxText = 10,
+        JsxTextAllWhiteSpaces = 11,
+        RegularExpressionLiteral = 12,
+        NoSubstitutionTemplateLiteral = 13,
+        TemplateHead = 14,
+        TemplateMiddle = 15,
+        TemplateTail = 16,
+        OpenBraceToken = 17,
+        CloseBraceToken = 18,
+        OpenParenToken = 19,
+        CloseParenToken = 20,
+        OpenBracketToken = 21,
+        CloseBracketToken = 22,
+        DotToken = 23,
+        DotDotDotToken = 24,
+        SemicolonToken = 25,
+        CommaToken = 26,
+        LessThanToken = 27,
+        LessThanSlashToken = 28,
+        GreaterThanToken = 29,
+        LessThanEqualsToken = 30,
+        GreaterThanEqualsToken = 31,
+        EqualsEqualsToken = 32,
+        ExclamationEqualsToken = 33,
+        EqualsEqualsEqualsToken = 34,
+        ExclamationEqualsEqualsToken = 35,
+        EqualsGreaterThanToken = 36,
+        PlusToken = 37,
+        MinusToken = 38,
+        AsteriskToken = 39,
+        AsteriskAsteriskToken = 40,
+        SlashToken = 41,
+        PercentToken = 42,
+        PlusPlusToken = 43,
+        MinusMinusToken = 44,
+        LessThanLessThanToken = 45,
+        GreaterThanGreaterThanToken = 46,
+        GreaterThanGreaterThanGreaterThanToken = 47,
+        AmpersandToken = 48,
+        BarToken = 49,
+        CaretToken = 50,
+        ExclamationToken = 51,
+        TildeToken = 52,
+        AmpersandAmpersandToken = 53,
+        BarBarToken = 54,
+        QuestionToken = 55,
+        ColonToken = 56,
+        AtToken = 57,
+        EqualsToken = 58,
+        PlusEqualsToken = 59,
+        MinusEqualsToken = 60,
+        AsteriskEqualsToken = 61,
+        AsteriskAsteriskEqualsToken = 62,
+        SlashEqualsToken = 63,
+        PercentEqualsToken = 64,
+        LessThanLessThanEqualsToken = 65,
+        GreaterThanGreaterThanEqualsToken = 66,
+        GreaterThanGreaterThanGreaterThanEqualsToken = 67,
+        AmpersandEqualsToken = 68,
+        BarEqualsToken = 69,
+        CaretEqualsToken = 70,
+        Identifier = 71,
+        BreakKeyword = 72,
+        CaseKeyword = 73,
+        CatchKeyword = 74,
+        ClassKeyword = 75,
+        ConstKeyword = 76,
+        ContinueKeyword = 77,
+        DebuggerKeyword = 78,
+        DefaultKeyword = 79,
+        DeleteKeyword = 80,
+        DoKeyword = 81,
+        ElseKeyword = 82,
+        EnumKeyword = 83,
+        ExportKeyword = 84,
+        ExtendsKeyword = 85,
+        FalseKeyword = 86,
+        FinallyKeyword = 87,
+        ForKeyword = 88,
+        FunctionKeyword = 89,
+        IfKeyword = 90,
+        ImportKeyword = 91,
+        InKeyword = 92,
+        InstanceOfKeyword = 93,
+        NewKeyword = 94,
+        NullKeyword = 95,
+        ReturnKeyword = 96,
+        SuperKeyword = 97,
+        SwitchKeyword = 98,
+        ThisKeyword = 99,
+        ThrowKeyword = 100,
+        TrueKeyword = 101,
+        TryKeyword = 102,
+        TypeOfKeyword = 103,
+        VarKeyword = 104,
+        VoidKeyword = 105,
+        WhileKeyword = 106,
+        WithKeyword = 107,
+        ImplementsKeyword = 108,
+        InterfaceKeyword = 109,
+        LetKeyword = 110,
+        PackageKeyword = 111,
+        PrivateKeyword = 112,
+        ProtectedKeyword = 113,
+        PublicKeyword = 114,
+        StaticKeyword = 115,
+        YieldKeyword = 116,
+        AbstractKeyword = 117,
+        AsKeyword = 118,
+        AnyKeyword = 119,
+        AsyncKeyword = 120,
+        AwaitKeyword = 121,
+        BooleanKeyword = 122,
+        ConstructorKeyword = 123,
+        DeclareKeyword = 124,
+        GetKeyword = 125,
+        InferKeyword = 126,
+        IsKeyword = 127,
+        KeyOfKeyword = 128,
+        ModuleKeyword = 129,
+        NamespaceKeyword = 130,
+        NeverKeyword = 131,
+        ReadonlyKeyword = 132,
+        RequireKeyword = 133,
+        NumberKeyword = 134,
+        ObjectKeyword = 135,
+        SetKeyword = 136,
+        StringKeyword = 137,
+        SymbolKeyword = 138,
+        TypeKeyword = 139,
+        UndefinedKeyword = 140,
+        UniqueKeyword = 141,
+        UnknownKeyword = 142,
+        FromKeyword = 143,
+        GlobalKeyword = 144,
+        OfKeyword = 145,
+        QualifiedName = 146,
+        ComputedPropertyName = 147,
+        TypeParameter = 148,
+        Parameter = 149,
+        Decorator = 150,
+        PropertySignature = 151,
+        PropertyDeclaration = 152,
+        MethodSignature = 153,
+        MethodDeclaration = 154,
+        Constructor = 155,
+        GetAccessor = 156,
+        SetAccessor = 157,
+        CallSignature = 158,
+        ConstructSignature = 159,
+        IndexSignature = 160,
+        TypePredicate = 161,
+        TypeReference = 162,
+        FunctionType = 163,
+        ConstructorType = 164,
+        TypeQuery = 165,
+        TypeLiteral = 166,
+        ArrayType = 167,
+        TupleType = 168,
+        UnionType = 169,
+        IntersectionType = 170,
+        ConditionalType = 171,
+        InferType = 172,
+        ParenthesizedType = 173,
+        ThisType = 174,
+        TypeOperator = 175,
+        IndexedAccessType = 176,
+        MappedType = 177,
+        LiteralType = 178,
+        ImportType = 179,
+        ObjectBindingPattern = 180,
+        ArrayBindingPattern = 181,
+        BindingElement = 182,
+        ArrayLiteralExpression = 183,
+        ObjectLiteralExpression = 184,
+        PropertyAccessExpression = 185,
+        ElementAccessExpression = 186,
+        CallExpression = 187,
+        NewExpression = 188,
+        TaggedTemplateExpression = 189,
+        TypeAssertionExpression = 190,
+        ParenthesizedExpression = 191,
+        FunctionExpression = 192,
+        ArrowFunction = 193,
+        DeleteExpression = 194,
+        TypeOfExpression = 195,
+        VoidExpression = 196,
+        AwaitExpression = 197,
+        PrefixUnaryExpression = 198,
+        PostfixUnaryExpression = 199,
+        BinaryExpression = 200,
+        ConditionalExpression = 201,
+        TemplateExpression = 202,
+        YieldExpression = 203,
+        SpreadElement = 204,
+        ClassExpression = 205,
+        OmittedExpression = 206,
+        ExpressionWithTypeArguments = 207,
+        AsExpression = 208,
+        NonNullExpression = 209,
+        MetaProperty = 210,
+        TemplateSpan = 211,
+        SemicolonClassElement = 212,
+        Block = 213,
+        VariableStatement = 214,
+        EmptyStatement = 215,
+        ExpressionStatement = 216,
+        IfStatement = 217,
+        DoStatement = 218,
+        WhileStatement = 219,
+        ForStatement = 220,
+        ForInStatement = 221,
+        ForOfStatement = 222,
+        ContinueStatement = 223,
+        BreakStatement = 224,
+        ReturnStatement = 225,
+        WithStatement = 226,
+        SwitchStatement = 227,
+        LabeledStatement = 228,
+        ThrowStatement = 229,
+        TryStatement = 230,
+        DebuggerStatement = 231,
+        VariableDeclaration = 232,
+        VariableDeclarationList = 233,
+        FunctionDeclaration = 234,
+        ClassDeclaration = 235,
+        InterfaceDeclaration = 236,
+        TypeAliasDeclaration = 237,
+        EnumDeclaration = 238,
+        ModuleDeclaration = 239,
+        ModuleBlock = 240,
+        CaseBlock = 241,
+        NamespaceExportDeclaration = 242,
+        ImportEqualsDeclaration = 243,
+        ImportDeclaration = 244,
+        ImportClause = 245,
+        NamespaceImport = 246,
+        NamedImports = 247,
+        ImportSpecifier = 248,
+        ExportAssignment = 249,
+        ExportDeclaration = 250,
+        NamedExports = 251,
+        ExportSpecifier = 252,
+        MissingDeclaration = 253,
+        ExternalModuleReference = 254,
+        JsxElement = 255,
+        JsxSelfClosingElement = 256,
+        JsxOpeningElement = 257,
+        JsxClosingElement = 258,
+        JsxFragment = 259,
+        JsxOpeningFragment = 260,
+        JsxClosingFragment = 261,
+        JsxAttribute = 262,
+        JsxAttributes = 263,
+        JsxSpreadAttribute = 264,
+        JsxExpression = 265,
+        CaseClause = 266,
+        DefaultClause = 267,
+        HeritageClause = 268,
+        CatchClause = 269,
+        PropertyAssignment = 270,
+        ShorthandPropertyAssignment = 271,
+        SpreadAssignment = 272,
+        EnumMember = 273,
+        SourceFile = 274,
+        Bundle = 275,
+        UnparsedSource = 276,
+        InputFiles = 277,
+        JSDocTypeExpression = 278,
+        JSDocAllType = 279,
+        JSDocUnknownType = 280,
+        JSDocNullableType = 281,
+        JSDocNonNullableType = 282,
+        JSDocOptionalType = 283,
+        JSDocFunctionType = 284,
+        JSDocVariadicType = 285,
+        JSDocComment = 286,
+        JSDocTypeLiteral = 287,
+        JSDocSignature = 288,
+        JSDocTag = 289,
+        JSDocAugmentsTag = 290,
+        JSDocClassTag = 291,
+        JSDocCallbackTag = 292,
+        JSDocParameterTag = 293,
+        JSDocReturnTag = 294,
+        JSDocTypeTag = 295,
+        JSDocTemplateTag = 296,
+        JSDocTypedefTag = 297,
+        JSDocPropertyTag = 298,
+        SyntaxList = 299,
+        NotEmittedStatement = 300,
+        PartiallyEmittedExpression = 301,
+        CommaListExpression = 302,
+        MergeDeclarationMarker = 303,
+        EndOfDeclarationMarker = 304,
+        Count = 305,
+        FirstAssignment = 58,
+        LastAssignment = 70,
+        FirstCompoundAssignment = 59,
+        LastCompoundAssignment = 70,
+        FirstReservedWord = 72,
+        LastReservedWord = 107,
+        FirstKeyword = 72,
+        LastKeyword = 145,
+        FirstFutureReservedWord = 108,
+        LastFutureReservedWord = 116,
+        FirstTypeNode = 161,
+        LastTypeNode = 179,
+        FirstPunctuation = 17,
+        LastPunctuation = 70,
+        FirstToken = 0,
+        LastToken = 145,
+        FirstTriviaToken = 2,
+        LastTriviaToken = 7,
+        FirstLiteralToken = 8,
+        LastLiteralToken = 13,
+        FirstTemplateToken = 13,
+        LastTemplateToken = 16,
+        FirstBinaryOperator = 27,
+        LastBinaryOperator = 70,
+        FirstNode = 146,
+        FirstJSDocNode = 278,
+        LastJSDocNode = 298,
+        FirstJSDocTagNode = 289,
+        LastJSDocTagNode = 298,
+        FirstContextualKeyword = 117,
+        LastContextualKeyword = 145
+    }
+    enum NodeFlags {
+        None = 0,
+        Let = 1,
+        Const = 2,
+        NestedNamespace = 4,
+        Synthesized = 8,
+        Namespace = 16,
+        ExportContext = 32,
+        ContainsThis = 64,
+        HasImplicitReturn = 128,
+        HasExplicitReturn = 256,
+        GlobalAugmentation = 512,
+        HasAsyncFunctions = 1024,
+        DisallowInContext = 2048,
+        YieldContext = 4096,
+        DecoratorContext = 8192,
+        AwaitContext = 16384,
+        ThisNodeHasError = 32768,
+        JavaScriptFile = 65536,
+        ThisNodeOrAnySubNodesHasError = 131072,
+        HasAggregatedChildData = 262144,
+        PossiblyContainsDynamicImport = 524288,
+        PossiblyContainsImportMeta = 1048576,
+        JSDoc = 2097152,
+        Ambient = 4194304,
+        InWithStatement = 8388608,
+        JsonFile = 16777216,
+        BlockScoped = 3,
+        ReachabilityCheckFlags = 384,
+        ReachabilityAndEmitFlags = 1408,
+        ContextFlags = 12679168,
+        TypeExcludesFlags = 20480,
+        PermanentlySetIncrementalFlags = 1572864
+    }
+    enum ModifierFlags {
+        None = 0,
+        Export = 1,
+        Ambient = 2,
+        Public = 4,
+        Private = 8,
+        Protected = 16,
+        Static = 32,
+        Readonly = 64,
+        Abstract = 128,
+        Async = 256,
+        Default = 512,
+        Const = 2048,
+        HasComputedFlags = 536870912,
+        AccessibilityModifier = 28,
+        ParameterPropertyModifier = 92,
+        NonPublicAccessibilityModifier = 24,
+        TypeScriptModifier = 2270,
+        ExportDefault = 513,
+        All = 3071
+    }
+    enum JsxFlags {
+        None = 0,
+        /** An element from a named property of the JSX.IntrinsicElements interface */
+        IntrinsicNamedElement = 1,
+        /** An element inferred from the string index signature of the JSX.IntrinsicElements interface */
+        IntrinsicIndexedElement = 2,
+        IntrinsicElement = 3
+    }
+    enum RelationComparisonResult {
+        Succeeded = 1,
+        Failed = 2,
+        FailedAndReported = 3
+    }
+    interface Node extends TextRange {
+        kind: SyntaxKind;
+        flags: NodeFlags;
+        modifierFlagsCache?: ModifierFlags;
+        transformFlags: TransformFlags;
+        decorators?: NodeArray<Decorator>;
+        modifiers?: ModifiersArray;
+        id?: number;
+        parent: Node;
+        original?: Node;
+        symbol: Symbol;
+        locals?: SymbolTable;
+        nextContainer?: Node;
+        localSymbol?: Symbol;
+        flowNode?: FlowNode;
+        emitNode?: EmitNode;
+        contextualType?: Type;
+        contextualMapper?: TypeMapper;
+    }
+    interface JSDocContainer {
+        jsDoc?: JSDoc[];
+        jsDocCache?: ReadonlyArray<JSDocTag>;
+    }
+    type HasJSDoc = ParameterDeclaration | CallSignatureDeclaration | ConstructSignatureDeclaration | MethodSignature | PropertySignature | ArrowFunction | ParenthesizedExpression | SpreadAssignment | ShorthandPropertyAssignment | PropertyAssignment | FunctionExpression | LabeledStatement | ExpressionStatement | VariableStatement | FunctionDeclaration | ConstructorDeclaration | MethodDeclaration | PropertyDeclaration | AccessorDeclaration | ClassLikeDeclaration | InterfaceDeclaration | TypeAliasDeclaration | EnumMember | EnumDeclaration | ModuleDeclaration | ImportEqualsDeclaration | IndexSignatureDeclaration | FunctionTypeNode | ConstructorTypeNode | JSDocFunctionType | EndOfFileToken;
+    type HasType = SignatureDeclaration | VariableDeclaration | ParameterDeclaration | PropertySignature | PropertyDeclaration | TypePredicateNode | ParenthesizedTypeNode | TypeOperatorNode | MappedTypeNode | AssertionExpression | TypeAliasDeclaration | JSDocTypeExpression | JSDocNonNullableType | JSDocNullableType | JSDocOptionalType | JSDocVariadicType;
+    type HasInitializer = HasExpressionInitializer | ForStatement | ForInStatement | ForOfStatement | JsxAttribute;
+    type HasExpressionInitializer = VariableDeclaration | ParameterDeclaration | BindingElement | PropertySignature | PropertyDeclaration | PropertyAssignment | EnumMember;
+    type MutableNodeArray<T extends Node> = NodeArray<T> & T[];
+    interface NodeArray<T extends Node> extends ReadonlyArray<T>, TextRange {
+        hasTrailingComma?: boolean;
+        transformFlags: TransformFlags;
+    }
+    interface Token<TKind extends SyntaxKind> extends Node {
+        kind: TKind;
+    }
+    type DotDotDotToken = Token<SyntaxKind.DotDotDotToken>;
+    type QuestionToken = Token<SyntaxKind.QuestionToken>;
+    type ExclamationToken = Token<SyntaxKind.ExclamationToken>;
+    type ColonToken = Token<SyntaxKind.ColonToken>;
+    type EqualsToken = Token<SyntaxKind.EqualsToken>;
+    type AsteriskToken = Token<SyntaxKind.AsteriskToken>;
+    type EqualsGreaterThanToken = Token<SyntaxKind.EqualsGreaterThanToken>;
+    type EndOfFileToken = Token<SyntaxKind.EndOfFileToken> & JSDocContainer;
+    type AtToken = Token<SyntaxKind.AtToken>;
+    type ReadonlyToken = Token<SyntaxKind.ReadonlyKeyword>;
+    type AwaitKeywordToken = Token<SyntaxKind.AwaitKeyword>;
+    type PlusToken = Token<SyntaxKind.PlusToken>;
+    type MinusToken = Token<SyntaxKind.MinusToken>;
+    type Modifier = Token<SyntaxKind.AbstractKeyword> | Token<SyntaxKind.AsyncKeyword> | Token<SyntaxKind.ConstKeyword> | Token<SyntaxKind.DeclareKeyword> | Token<SyntaxKind.DefaultKeyword> | Token<SyntaxKind.ExportKeyword> | Token<SyntaxKind.PublicKeyword> | Token<SyntaxKind.PrivateKeyword> | Token<SyntaxKind.ProtectedKeyword> | Token<SyntaxKind.ReadonlyKeyword> | Token<SyntaxKind.StaticKeyword>;
+    type ModifiersArray = NodeArray<Modifier>;
+    enum GeneratedIdentifierFlags {
+        None = 0,
+        Auto = 1,
+        Loop = 2,
+        Unique = 3,
+        Node = 4,
+        KindMask = 7,
+        ReservedInNestedScopes = 8,
+        Optimistic = 16,
+        FileLevel = 32
+    }
+    interface Identifier extends PrimaryExpression, Declaration {
+        kind: SyntaxKind.Identifier;
+        /**
+         * Prefer to use `id.unescapedText`. (Note: This is available only in services, not internally to the TypeScript compiler.)
+         * Text of identifier, but if the identifier begins with two underscores, this will begin with three.
+         */
+        escapedText: __String;
+        originalKeywordKind?: SyntaxKind;
+        autoGenerateFlags?: GeneratedIdentifierFlags;
+        autoGenerateId?: number;
+        isInJSDocNamespace?: boolean;
+        typeArguments?: NodeArray<TypeNode | TypeParameterDeclaration>;
+        jsdocDotPos?: number;
+    }
+    interface TransientIdentifier extends Identifier {
+        resolvedSymbol: Symbol;
+    }
+    interface GeneratedIdentifier extends Identifier {
+        autoGenerateFlags: GeneratedIdentifierFlags;
+    }
+    interface QualifiedName extends Node {
+        kind: SyntaxKind.QualifiedName;
+        left: EntityName;
+        right: Identifier;
+        jsdocDotPos?: number;
+    }
+    type EntityName = Identifier | QualifiedName;
+    type PropertyName = Identifier | StringLiteral | NumericLiteral | ComputedPropertyName;
+    type DeclarationName = Identifier | StringLiteral | NumericLiteral | ComputedPropertyName | BindingPattern;
+    interface Declaration extends Node {
+        _declarationBrand: any;
+    }
+    interface NamedDeclaration extends Declaration {
+        name?: DeclarationName;
+    }
+    interface DynamicNamedDeclaration extends NamedDeclaration {
+        name: ComputedPropertyName;
+    }
+    interface LateBoundDeclaration extends DynamicNamedDeclaration {
+        name: LateBoundName;
+    }
+    interface DeclarationStatement extends NamedDeclaration, Statement {
+        name?: Identifier | StringLiteral | NumericLiteral;
+    }
+    interface ComputedPropertyName extends Node {
+        kind: SyntaxKind.ComputedPropertyName;
+        expression: Expression;
+    }
+    interface LateBoundName extends ComputedPropertyName {
+        expression: EntityNameExpression;
+    }
+    interface Decorator extends Node {
+        kind: SyntaxKind.Decorator;
+        parent: NamedDeclaration;
+        expression: LeftHandSideExpression;
+    }
+    interface TypeParameterDeclaration extends NamedDeclaration {
+        kind: SyntaxKind.TypeParameter;
+        parent: DeclarationWithTypeParameters | InferTypeNode;
+        name: Identifier;
+        constraint?: TypeNode;
+        default?: TypeNode;
+        expression?: Expression;
+    }
+    interface SignatureDeclarationBase extends NamedDeclaration, JSDocContainer {
+        kind: SignatureDeclaration["kind"];
+        name?: PropertyName;
+        typeParameters?: NodeArray<TypeParameterDeclaration>;
+        parameters: NodeArray<ParameterDeclaration>;
+        type?: TypeNode;
+        typeArguments?: NodeArray<TypeNode>;
+    }
+    type SignatureDeclaration = CallSignatureDeclaration | ConstructSignatureDeclaration | MethodSignature | IndexSignatureDeclaration | FunctionTypeNode | ConstructorTypeNode | JSDocFunctionType | FunctionDeclaration | MethodDeclaration | ConstructorDeclaration | AccessorDeclaration | FunctionExpression | ArrowFunction;
+    interface CallSignatureDeclaration extends SignatureDeclarationBase, TypeElement {
+        kind: SyntaxKind.CallSignature;
+    }
+    interface ConstructSignatureDeclaration extends SignatureDeclarationBase, TypeElement {
+        kind: SyntaxKind.ConstructSignature;
+    }
+    type BindingName = Identifier | BindingPattern;
+    interface VariableDeclaration extends NamedDeclaration {
+        kind: SyntaxKind.VariableDeclaration;
+        parent: VariableDeclarationList | CatchClause;
+        name: BindingName;
+        exclamationToken?: ExclamationToken;
+        type?: TypeNode;
+        initializer?: Expression;
+    }
+    interface VariableDeclarationList extends Node {
+        kind: SyntaxKind.VariableDeclarationList;
+        parent: VariableStatement | ForStatement | ForOfStatement | ForInStatement;
+        declarations: NodeArray<VariableDeclaration>;
+    }
+    interface ParameterDeclaration extends NamedDeclaration, JSDocContainer {
+        kind: SyntaxKind.Parameter;
+        parent: SignatureDeclaration;
+        dotDotDotToken?: DotDotDotToken;
+        name: BindingName;
+        questionToken?: QuestionToken;
+        type?: TypeNode;
+        initializer?: Expression;
+    }
+    interface BindingElement extends NamedDeclaration {
+        kind: SyntaxKind.BindingElement;
+        parent: BindingPattern;
+        propertyName?: PropertyName;
+        dotDotDotToken?: DotDotDotToken;
+        name: BindingName;
+        initializer?: Expression;
+    }
+    type BindingElementGrandparent = BindingElement["parent"]["parent"];
+    interface PropertySignature extends TypeElement, JSDocContainer {
+        kind: SyntaxKind.PropertySignature;
+        name: PropertyName;
+        questionToken?: QuestionToken;
+        type?: TypeNode;
+        initializer?: Expression;
+    }
+    interface PropertyDeclaration extends ClassElement, JSDocContainer {
+        kind: SyntaxKind.PropertyDeclaration;
+        parent: ClassLikeDeclaration;
+        name: PropertyName;
+        questionToken?: QuestionToken;
+        exclamationToken?: ExclamationToken;
+        type?: TypeNode;
+        initializer?: Expression;
+    }
+    interface ObjectLiteralElement extends NamedDeclaration {
+        _objectLiteralBrandBrand: any;
+        name?: PropertyName;
+    }
+    type ObjectLiteralElementLike = PropertyAssignment | ShorthandPropertyAssignment | SpreadAssignment | MethodDeclaration | AccessorDeclaration;
+    interface PropertyAssignment extends ObjectLiteralElement, JSDocContainer {
+        parent: ObjectLiteralExpression;
+        kind: SyntaxKind.PropertyAssignment;
+        name: PropertyName;
+        questionToken?: QuestionToken;
+        initializer: Expression;
+    }
+    interface ShorthandPropertyAssignment extends ObjectLiteralElement, JSDocContainer {
+        parent: ObjectLiteralExpression;
+        kind: SyntaxKind.ShorthandPropertyAssignment;
+        name: Identifier;
+        questionToken?: QuestionToken;
+        equalsToken?: Token<SyntaxKind.EqualsToken>;
+        objectAssignmentInitializer?: Expression;
+    }
+    interface SpreadAssignment extends ObjectLiteralElement, JSDocContainer {
+        parent: ObjectLiteralExpression;
+        kind: SyntaxKind.SpreadAssignment;
+        expression: Expression;
+    }
+    type VariableLikeDeclaration = VariableDeclaration | ParameterDeclaration | BindingElement | PropertyDeclaration | PropertyAssignment | PropertySignature | JsxAttribute | ShorthandPropertyAssignment | EnumMember | JSDocPropertyTag | JSDocParameterTag;
+    interface PropertyLikeDeclaration extends NamedDeclaration {
+        name: PropertyName;
+    }
+    interface ObjectBindingPattern extends Node {
+        kind: SyntaxKind.ObjectBindingPattern;
+        parent: VariableDeclaration | ParameterDeclaration | BindingElement;
+        elements: NodeArray<BindingElement>;
+    }
+    interface ArrayBindingPattern extends Node {
+        kind: SyntaxKind.ArrayBindingPattern;
+        parent: VariableDeclaration | ParameterDeclaration | BindingElement;
+        elements: NodeArray<ArrayBindingElement>;
+    }
+    type BindingPattern = ObjectBindingPattern | ArrayBindingPattern;
+    type ArrayBindingElement = BindingElement | OmittedExpression;
+    /**
+     * Several node kinds share function-like features such as a signature,
+     * a name, and a body. These nodes should extend FunctionLikeDeclarationBase.
+     * Examples:
+     * - FunctionDeclaration
+     * - MethodDeclaration
+     * - AccessorDeclaration
+     */
+    interface FunctionLikeDeclarationBase extends SignatureDeclarationBase {
+        _functionLikeDeclarationBrand: any;
+        asteriskToken?: AsteriskToken;
+        questionToken?: QuestionToken;
+        body?: Block | Expression;
+    }
+    type FunctionLikeDeclaration = FunctionDeclaration | MethodDeclaration | GetAccessorDeclaration | SetAccessorDeclaration | ConstructorDeclaration | FunctionExpression | ArrowFunction;
+    /** @deprecated Use SignatureDeclaration */
+    type FunctionLike = SignatureDeclaration;
+    interface FunctionDeclaration extends FunctionLikeDeclarationBase, DeclarationStatement {
+        kind: SyntaxKind.FunctionDeclaration;
+        name?: Identifier;
+        body?: FunctionBody;
+    }
+    interface MethodSignature extends SignatureDeclarationBase, TypeElement {
+        kind: SyntaxKind.MethodSignature;
+        parent: ObjectTypeDeclaration;
+        name: PropertyName;
+    }
+    interface MethodDeclaration extends FunctionLikeDeclarationBase, ClassElement, ObjectLiteralElement, JSDocContainer {
+        kind: SyntaxKind.MethodDeclaration;
+        parent: ClassLikeDeclaration | ObjectLiteralExpression;
+        name: PropertyName;
+        body?: FunctionBody;
+    }
+    interface ConstructorDeclaration extends FunctionLikeDeclarationBase, ClassElement, JSDocContainer {
+        kind: SyntaxKind.Constructor;
+        parent: ClassLikeDeclaration;
+        body?: FunctionBody;
+        returnFlowNode?: FlowNode;
+    }
+    /** For when we encounter a semicolon in a class declaration. ES6 allows these as class elements. */
+    interface SemicolonClassElement extends ClassElement {
+        kind: SyntaxKind.SemicolonClassElement;
+        parent: ClassLikeDeclaration;
+    }
+    interface GetAccessorDeclaration extends FunctionLikeDeclarationBase, ClassElement, ObjectLiteralElement, JSDocContainer {
+        kind: SyntaxKind.GetAccessor;
+        parent: ClassLikeDeclaration | ObjectLiteralExpression;
+        name: PropertyName;
+        body?: FunctionBody;
+    }
+    interface SetAccessorDeclaration extends FunctionLikeDeclarationBase, ClassElement, ObjectLiteralElement, JSDocContainer {
+        kind: SyntaxKind.SetAccessor;
+        parent: ClassLikeDeclaration | ObjectLiteralExpression;
+        name: PropertyName;
+        body?: FunctionBody;
+    }
+    type AccessorDeclaration = GetAccessorDeclaration | SetAccessorDeclaration;
+    interface IndexSignatureDeclaration extends SignatureDeclarationBase, ClassElement, TypeElement {
+        kind: SyntaxKind.IndexSignature;
+        parent: ObjectTypeDeclaration;
+    }
+    interface TypeNode extends Node {
+        _typeNodeBrand: any;
+    }
+    interface KeywordTypeNode extends TypeNode {
+        kind: SyntaxKind.AnyKeyword | SyntaxKind.UnknownKeyword | SyntaxKind.NumberKeyword | SyntaxKind.ObjectKeyword | SyntaxKind.BooleanKeyword | SyntaxKind.StringKeyword | SyntaxKind.SymbolKeyword | SyntaxKind.ThisKeyword | SyntaxKind.VoidKeyword | SyntaxKind.UndefinedKeyword | SyntaxKind.NullKeyword | SyntaxKind.NeverKeyword;
+    }
+    interface ImportTypeNode extends NodeWithTypeArguments {
+        kind: SyntaxKind.ImportType;
+        isTypeOf?: boolean;
+        argument: TypeNode;
+        qualifier?: EntityName;
+    }
+    type LiteralImportTypeNode = ImportTypeNode & {
+        argument: LiteralTypeNode & {
+            literal: StringLiteral;
+        };
+    };
+    interface ThisTypeNode extends TypeNode {
+        kind: SyntaxKind.ThisType;
+    }
+    type FunctionOrConstructorTypeNode = FunctionTypeNode | ConstructorTypeNode;
+    interface FunctionOrConstructorTypeNodeBase extends TypeNode, SignatureDeclarationBase {
+        kind: SyntaxKind.FunctionType | SyntaxKind.ConstructorType;
+        type: TypeNode;
+    }
+    interface FunctionTypeNode extends FunctionOrConstructorTypeNodeBase {
+        kind: SyntaxKind.FunctionType;
+    }
+    interface ConstructorTypeNode extends FunctionOrConstructorTypeNodeBase {
+        kind: SyntaxKind.ConstructorType;
+    }
+    interface NodeWithTypeArguments extends TypeNode {
+        typeArguments?: NodeArray<TypeNode>;
+    }
+    type TypeReferenceType = TypeReferenceNode | ExpressionWithTypeArguments;
+    interface TypeReferenceNode extends NodeWithTypeArguments {
+        kind: SyntaxKind.TypeReference;
+        typeName: EntityName;
+    }
+    interface TypePredicateNode extends TypeNode {
+        kind: SyntaxKind.TypePredicate;
+        parent: SignatureDeclaration;
+        parameterName: Identifier | ThisTypeNode;
+        type: TypeNode;
+    }
+    interface TypeQueryNode extends TypeNode {
+        kind: SyntaxKind.TypeQuery;
+        exprName: EntityName;
+    }
+    interface TypeLiteralNode extends TypeNode, Declaration {
+        kind: SyntaxKind.TypeLiteral;
+        members: NodeArray<TypeElement>;
+    }
+    interface ArrayTypeNode extends TypeNode {
+        kind: SyntaxKind.ArrayType;
+        elementType: TypeNode;
+    }
+    interface TupleTypeNode extends TypeNode {
+        kind: SyntaxKind.TupleType;
+        elementTypes: NodeArray<TypeNode>;
+    }
+    type UnionOrIntersectionTypeNode = UnionTypeNode | IntersectionTypeNode;
+    interface UnionTypeNode extends TypeNode {
+        kind: SyntaxKind.UnionType;
+        types: NodeArray<TypeNode>;
+    }
+    interface IntersectionTypeNode extends TypeNode {
+        kind: SyntaxKind.IntersectionType;
+        types: NodeArray<TypeNode>;
+    }
+    interface ConditionalTypeNode extends TypeNode {
+        kind: SyntaxKind.ConditionalType;
+        checkType: TypeNode;
+        extendsType: TypeNode;
+        trueType: TypeNode;
+        falseType: TypeNode;
+    }
+    interface InferTypeNode extends TypeNode {
+        kind: SyntaxKind.InferType;
+        typeParameter: TypeParameterDeclaration;
+    }
+    interface ParenthesizedTypeNode extends TypeNode {
+        kind: SyntaxKind.ParenthesizedType;
+        type: TypeNode;
+    }
+    interface TypeOperatorNode extends TypeNode {
+        kind: SyntaxKind.TypeOperator;
+        operator: SyntaxKind.KeyOfKeyword | SyntaxKind.UniqueKeyword;
+        type: TypeNode;
+    }
+    interface UniqueTypeOperatorNode extends TypeOperatorNode {
+        operator: SyntaxKind.UniqueKeyword;
+    }
+    interface IndexedAccessTypeNode extends TypeNode {
+        kind: SyntaxKind.IndexedAccessType;
+        objectType: TypeNode;
+        indexType: TypeNode;
+    }
+    interface MappedTypeNode extends TypeNode, Declaration {
+        kind: SyntaxKind.MappedType;
+        readonlyToken?: ReadonlyToken | PlusToken | MinusToken;
+        typeParameter: TypeParameterDeclaration;
+        questionToken?: QuestionToken | PlusToken | MinusToken;
+        type?: TypeNode;
+    }
+    interface LiteralTypeNode extends TypeNode {
+        kind: SyntaxKind.LiteralType;
+        literal: BooleanLiteral | LiteralExpression | PrefixUnaryExpression;
+    }
+    interface StringLiteral extends LiteralExpression {
+        kind: SyntaxKind.StringLiteral;
+        textSourceNode?: Identifier | StringLiteralLike | NumericLiteral;
+        /** Note: this is only set when synthesizing a node, not during parsing. */
+        singleQuote?: boolean;
+    }
+    type StringLiteralLike = StringLiteral | NoSubstitutionTemplateLiteral;
+    interface Expression extends Node {
+        _expressionBrand: any;
+    }
+    interface OmittedExpression extends Expression {
+        kind: SyntaxKind.OmittedExpression;
+    }
+    interface PartiallyEmittedExpression extends LeftHandSideExpression {
+        kind: SyntaxKind.PartiallyEmittedExpression;
+        expression: Expression;
+    }
+    interface UnaryExpression extends Expression {
+        _unaryExpressionBrand: any;
+    }
+    /** Deprecated, please use UpdateExpression */
+    type IncrementExpression = UpdateExpression;
+    interface UpdateExpression extends UnaryExpression {
+        _updateExpressionBrand: any;
+    }
+    type PrefixUnaryOperator = SyntaxKind.PlusPlusToken | SyntaxKind.MinusMinusToken | SyntaxKind.PlusToken | SyntaxKind.MinusToken | SyntaxKind.TildeToken | SyntaxKind.ExclamationToken;
+    interface PrefixUnaryExpression extends UpdateExpression {
+        kind: SyntaxKind.PrefixUnaryExpression;
+        operator: PrefixUnaryOperator;
+        operand: UnaryExpression;
+    }
+    type PostfixUnaryOperator = SyntaxKind.PlusPlusToken | SyntaxKind.MinusMinusToken;
+    interface PostfixUnaryExpression extends UpdateExpression {
+        kind: SyntaxKind.PostfixUnaryExpression;
+        operand: LeftHandSideExpression;
+        operator: PostfixUnaryOperator;
+    }
+    interface LeftHandSideExpression extends UpdateExpression {
+        _leftHandSideExpressionBrand: any;
+    }
+    interface MemberExpression extends LeftHandSideExpression {
+        _memberExpressionBrand: any;
+    }
+    interface PrimaryExpression extends MemberExpression {
+        _primaryExpressionBrand: any;
+    }
+    interface NullLiteral extends PrimaryExpression, TypeNode {
+        kind: SyntaxKind.NullKeyword;
+    }
+    interface BooleanLiteral extends PrimaryExpression, TypeNode {
+        kind: SyntaxKind.TrueKeyword | SyntaxKind.FalseKeyword;
+    }
+    interface ThisExpression extends PrimaryExpression, KeywordTypeNode {
+        kind: SyntaxKind.ThisKeyword;
+    }
+    interface SuperExpression extends PrimaryExpression {
+        kind: SyntaxKind.SuperKeyword;
+    }
+    interface ImportExpression extends PrimaryExpression {
+        kind: SyntaxKind.ImportKeyword;
+    }
+    interface DeleteExpression extends UnaryExpression {
+        kind: SyntaxKind.DeleteExpression;
+        expression: UnaryExpression;
+    }
+    interface TypeOfExpression extends UnaryExpression {
+        kind: SyntaxKind.TypeOfExpression;
+        expression: UnaryExpression;
+    }
+    interface VoidExpression extends UnaryExpression {
+        kind: SyntaxKind.VoidExpression;
+        expression: UnaryExpression;
+    }
+    interface AwaitExpression extends UnaryExpression {
+        kind: SyntaxKind.AwaitExpression;
+        expression: UnaryExpression;
+    }
+    interface YieldExpression extends Expression {
+        kind: SyntaxKind.YieldExpression;
+        asteriskToken?: AsteriskToken;
+        expression?: Expression;
+    }
+    type ExponentiationOperator = SyntaxKind.AsteriskAsteriskToken;
+    type MultiplicativeOperator = SyntaxKind.AsteriskToken | SyntaxKind.SlashToken | SyntaxKind.PercentToken;
+    type MultiplicativeOperatorOrHigher = ExponentiationOperator | MultiplicativeOperator;
+    type AdditiveOperator = SyntaxKind.PlusToken | SyntaxKind.MinusToken;
+    type AdditiveOperatorOrHigher = MultiplicativeOperatorOrHigher | AdditiveOperator;
+    type ShiftOperator = SyntaxKind.LessThanLessThanToken | SyntaxKind.GreaterThanGreaterThanToken | SyntaxKind.GreaterThanGreaterThanGreaterThanToken;
+    type ShiftOperatorOrHigher = AdditiveOperatorOrHigher | ShiftOperator;
+    type RelationalOperator = SyntaxKind.LessThanToken | SyntaxKind.LessThanEqualsToken | SyntaxKind.GreaterThanToken | SyntaxKind.GreaterThanEqualsToken | SyntaxKind.InstanceOfKeyword | SyntaxKind.InKeyword;
+    type RelationalOperatorOrHigher = ShiftOperatorOrHigher | RelationalOperator;
+    type EqualityOperator = SyntaxKind.EqualsEqualsToken | SyntaxKind.EqualsEqualsEqualsToken | SyntaxKind.ExclamationEqualsEqualsToken | SyntaxKind.ExclamationEqualsToken;
+    type EqualityOperatorOrHigher = RelationalOperatorOrHigher | EqualityOperator;
+    type BitwiseOperator = SyntaxKind.AmpersandToken | SyntaxKind.BarToken | SyntaxKind.CaretToken;
+    type BitwiseOperatorOrHigher = EqualityOperatorOrHigher | BitwiseOperator;
+    type LogicalOperator = SyntaxKind.AmpersandAmpersandToken | SyntaxKind.BarBarToken;
+    type LogicalOperatorOrHigher = BitwiseOperatorOrHigher | LogicalOperator;
+    type CompoundAssignmentOperator = SyntaxKind.PlusEqualsToken | SyntaxKind.MinusEqualsToken | SyntaxKind.AsteriskAsteriskEqualsToken | SyntaxKind.AsteriskEqualsToken | SyntaxKind.SlashEqualsToken | SyntaxKind.PercentEqualsToken | SyntaxKind.AmpersandEqualsToken | SyntaxKind.BarEqualsToken | SyntaxKind.CaretEqualsToken | SyntaxKind.LessThanLessThanEqualsToken | SyntaxKind.GreaterThanGreaterThanGreaterThanEqualsToken | SyntaxKind.GreaterThanGreaterThanEqualsToken;
+    type AssignmentOperator = SyntaxKind.EqualsToken | CompoundAssignmentOperator;
+    type AssignmentOperatorOrHigher = LogicalOperatorOrHigher | AssignmentOperator;
+    type BinaryOperator = AssignmentOperatorOrHigher | SyntaxKind.CommaToken;
+    type BinaryOperatorToken = Token<BinaryOperator>;
+    interface BinaryExpression extends Expression, Declaration {
+        kind: SyntaxKind.BinaryExpression;
+        left: Expression;
+        operatorToken: BinaryOperatorToken;
+        right: Expression;
+    }
+    type AssignmentOperatorToken = Token<AssignmentOperator>;
+    interface AssignmentExpression<TOperator extends AssignmentOperatorToken> extends BinaryExpression {
+        left: LeftHandSideExpression;
+        operatorToken: TOperator;
+    }
+    interface ObjectDestructuringAssignment extends AssignmentExpression<EqualsToken> {
+        left: ObjectLiteralExpression;
+    }
+    interface ArrayDestructuringAssignment extends AssignmentExpression<EqualsToken> {
+        left: ArrayLiteralExpression;
+    }
+    type DestructuringAssignment = ObjectDestructuringAssignment | ArrayDestructuringAssignment;
+    type BindingOrAssignmentElement = VariableDeclaration | ParameterDeclaration | BindingElement | PropertyAssignment | ShorthandPropertyAssignment | SpreadAssignment | OmittedExpression | SpreadElement | ArrayLiteralExpression | ObjectLiteralExpression | AssignmentExpression<EqualsToken> | Identifier | PropertyAccessExpression | ElementAccessExpression;
+    type BindingOrAssignmentElementRestIndicator = DotDotDotToken | SpreadElement | SpreadAssignment;
+    type BindingOrAssignmentElementTarget = BindingOrAssignmentPattern | Identifier | PropertyAccessExpression | ElementAccessExpression | OmittedExpression;
+    type ObjectBindingOrAssignmentPattern = ObjectBindingPattern | ObjectLiteralExpression;
+    type ArrayBindingOrAssignmentPattern = ArrayBindingPattern | ArrayLiteralExpression;
+    type AssignmentPattern = ObjectLiteralExpression | ArrayLiteralExpression;
+    type BindingOrAssignmentPattern = ObjectBindingOrAssignmentPattern | ArrayBindingOrAssignmentPattern;
+    interface ConditionalExpression extends Expression {
+        kind: SyntaxKind.ConditionalExpression;
+        condition: Expression;
+        questionToken: QuestionToken;
+        whenTrue: Expression;
+        colonToken: ColonToken;
+        whenFalse: Expression;
+    }
+    type FunctionBody = Block;
+    type ConciseBody = FunctionBody | Expression;
+    interface FunctionExpression extends PrimaryExpression, FunctionLikeDeclarationBase, JSDocContainer {
+        kind: SyntaxKind.FunctionExpression;
+        name?: Identifier;
+        body: FunctionBody;
+    }
+    interface ArrowFunction extends Expression, FunctionLikeDeclarationBase, JSDocContainer {
+        kind: SyntaxKind.ArrowFunction;
+        equalsGreaterThanToken: EqualsGreaterThanToken;
+        body: ConciseBody;
+        name: never;
+    }
+    interface LiteralLikeNode extends Node {
+        text: string;
+        isUnterminated?: boolean;
+        hasExtendedUnicodeEscape?: boolean;
+    }
+    interface LiteralExpression extends LiteralLikeNode, PrimaryExpression {
+        _literalExpressionBrand: any;
+    }
+    interface RegularExpressionLiteral extends LiteralExpression {
+        kind: SyntaxKind.RegularExpressionLiteral;
+    }
+    interface NoSubstitutionTemplateLiteral extends LiteralExpression {
+        kind: SyntaxKind.NoSubstitutionTemplateLiteral;
+    }
+    enum TokenFlags {
+        None = 0,
+        PrecedingLineBreak = 1,
+        PrecedingJSDocComment = 2,
+        Unterminated = 4,
+        ExtendedUnicodeEscape = 8,
+        Scientific = 16,
+        Octal = 32,
+        HexSpecifier = 64,
+        BinarySpecifier = 128,
+        OctalSpecifier = 256,
+        ContainsSeparator = 512,
+        BinaryOrOctalSpecifier = 384,
+        NumericLiteralFlags = 1008
+    }
+    interface NumericLiteral extends LiteralExpression {
+        kind: SyntaxKind.NumericLiteral;
+        numericLiteralFlags: TokenFlags;
+    }
+    interface TemplateHead extends LiteralLikeNode {
+        kind: SyntaxKind.TemplateHead;
+        parent: TemplateExpression;
+    }
+    interface TemplateMiddle extends LiteralLikeNode {
+        kind: SyntaxKind.TemplateMiddle;
+        parent: TemplateSpan;
+    }
+    interface TemplateTail extends LiteralLikeNode {
+        kind: SyntaxKind.TemplateTail;
+        parent: TemplateSpan;
+    }
+    type TemplateLiteral = TemplateExpression | NoSubstitutionTemplateLiteral;
+    interface TemplateExpression extends PrimaryExpression {
+        kind: SyntaxKind.TemplateExpression;
+        head: TemplateHead;
+        templateSpans: NodeArray<TemplateSpan>;
+    }
+    interface TemplateSpan extends Node {
+        kind: SyntaxKind.TemplateSpan;
+        parent: TemplateExpression;
+        expression: Expression;
+        literal: TemplateMiddle | TemplateTail;
+    }
+    interface ParenthesizedExpression extends PrimaryExpression, JSDocContainer {
+        kind: SyntaxKind.ParenthesizedExpression;
+        expression: Expression;
+    }
+    interface ArrayLiteralExpression extends PrimaryExpression {
+        kind: SyntaxKind.ArrayLiteralExpression;
+        elements: NodeArray<Expression>;
+        multiLine?: boolean;
+    }
+    interface SpreadElement extends Expression {
+        kind: SyntaxKind.SpreadElement;
+        parent: ArrayLiteralExpression | CallExpression | NewExpression;
+        expression: Expression;
+    }
+    /**
+     * This interface is a base interface for ObjectLiteralExpression and JSXAttributes to extend from. JSXAttributes is similar to
+     * ObjectLiteralExpression in that it contains array of properties; however, JSXAttributes' properties can only be
+     * JSXAttribute or JSXSpreadAttribute. ObjectLiteralExpression, on the other hand, can only have properties of type
+     * ObjectLiteralElement (e.g. PropertyAssignment, ShorthandPropertyAssignment etc.)
+     */
+    interface ObjectLiteralExpressionBase<T extends ObjectLiteralElement> extends PrimaryExpression, Declaration {
+        properties: NodeArray<T>;
+    }
+    interface ObjectLiteralExpression extends ObjectLiteralExpressionBase<ObjectLiteralElementLike> {
+        kind: SyntaxKind.ObjectLiteralExpression;
+        multiLine?: boolean;
+    }
+    type EntityNameExpression = Identifier | PropertyAccessEntityNameExpression;
+    type EntityNameOrEntityNameExpression = EntityName | EntityNameExpression;
+    interface PropertyAccessExpression extends MemberExpression, NamedDeclaration {
+        kind: SyntaxKind.PropertyAccessExpression;
+        expression: LeftHandSideExpression;
+        name: Identifier;
+    }
+    interface SuperPropertyAccessExpression extends PropertyAccessExpression {
+        expression: SuperExpression;
+    }
+    /** Brand for a PropertyAccessExpression which, like a QualifiedName, consists of a sequence of identifiers separated by dots. */
+    interface PropertyAccessEntityNameExpression extends PropertyAccessExpression {
+        _propertyAccessExpressionLikeQualifiedNameBrand?: any;
+        expression: EntityNameExpression;
+    }
+    interface ElementAccessExpression extends MemberExpression {
+        kind: SyntaxKind.ElementAccessExpression;
+        expression: LeftHandSideExpression;
+        argumentExpression: Expression;
+    }
+    interface SuperElementAccessExpression extends ElementAccessExpression {
+        expression: SuperExpression;
+    }
+    type SuperProperty = SuperPropertyAccessExpression | SuperElementAccessExpression;
+    interface CallExpression extends LeftHandSideExpression, Declaration {
+        kind: SyntaxKind.CallExpression;
+        expression: LeftHandSideExpression;
+        typeArguments?: NodeArray<TypeNode>;
+        arguments: NodeArray<Expression>;
+    }
+    interface SuperCall extends CallExpression {
+        expression: SuperExpression;
+    }
+    interface ImportCall extends CallExpression {
+        expression: ImportExpression;
+    }
+    interface ExpressionWithTypeArguments extends NodeWithTypeArguments {
+        kind: SyntaxKind.ExpressionWithTypeArguments;
+        parent: HeritageClause;
+        expression: LeftHandSideExpression;
+    }
+    interface NewExpression extends PrimaryExpression, Declaration {
+        kind: SyntaxKind.NewExpression;
+        expression: LeftHandSideExpression;
+        typeArguments?: NodeArray<TypeNode>;
+        arguments?: NodeArray<Expression>;
+    }
+    interface TaggedTemplateExpression extends MemberExpression {
+        kind: SyntaxKind.TaggedTemplateExpression;
+        tag: LeftHandSideExpression;
+        typeArguments?: NodeArray<TypeNode>;
+        template: TemplateLiteral;
+    }
+    type CallLikeExpression = CallExpression | NewExpression | TaggedTemplateExpression | Decorator | JsxOpeningLikeElement;
+    interface AsExpression extends Expression {
+        kind: SyntaxKind.AsExpression;
+        expression: Expression;
+        type: TypeNode;
+    }
+    interface TypeAssertion extends UnaryExpression {
+        kind: SyntaxKind.TypeAssertionExpression;
+        type: TypeNode;
+        expression: UnaryExpression;
+    }
+    type AssertionExpression = TypeAssertion | AsExpression;
+    interface NonNullExpression extends LeftHandSideExpression {
+        kind: SyntaxKind.NonNullExpression;
+        expression: Expression;
+    }
+    interface MetaProperty extends PrimaryExpression {
+        kind: SyntaxKind.MetaProperty;
+        keywordToken: SyntaxKind.NewKeyword | SyntaxKind.ImportKeyword;
+        name: Identifier;
+    }
+    interface JsxElement extends PrimaryExpression {
+        kind: SyntaxKind.JsxElement;
+        openingElement: JsxOpeningElement;
+        children: NodeArray<JsxChild>;
+        closingElement: JsxClosingElement;
+    }
+    type JsxOpeningLikeElement = JsxSelfClosingElement | JsxOpeningElement;
+    type JsxAttributeLike = JsxAttribute | JsxSpreadAttribute;
+    type JsxTagNameExpression = PrimaryExpression | PropertyAccessExpression;
+    interface JsxAttributes extends ObjectLiteralExpressionBase<JsxAttributeLike> {
+        parent: JsxOpeningLikeElement;
+    }
+    interface JsxOpeningElement extends Expression {
+        kind: SyntaxKind.JsxOpeningElement;
+        parent: JsxElement;
+        tagName: JsxTagNameExpression;
+        typeArguments?: NodeArray<TypeNode>;
+        attributes: JsxAttributes;
+    }
+    interface JsxSelfClosingElement extends PrimaryExpression {
+        kind: SyntaxKind.JsxSelfClosingElement;
+        tagName: JsxTagNameExpression;
+        typeArguments?: NodeArray<TypeNode>;
+        attributes: JsxAttributes;
+    }
+    interface JsxFragment extends PrimaryExpression {
+        kind: SyntaxKind.JsxFragment;
+        openingFragment: JsxOpeningFragment;
+        children: NodeArray<JsxChild>;
+        closingFragment: JsxClosingFragment;
+    }
+    interface JsxOpeningFragment extends Expression {
+        kind: SyntaxKind.JsxOpeningFragment;
+        parent: JsxFragment;
+    }
+    interface JsxClosingFragment extends Expression {
+        kind: SyntaxKind.JsxClosingFragment;
+        parent: JsxFragment;
+    }
+    interface JsxAttribute extends ObjectLiteralElement {
+        kind: SyntaxKind.JsxAttribute;
+        parent: JsxAttributes;
+        name: Identifier;
+        initializer?: StringLiteral | JsxExpression;
+    }
+    interface JsxSpreadAttribute extends ObjectLiteralElement {
+        kind: SyntaxKind.JsxSpreadAttribute;
+        parent: JsxAttributes;
+        expression: Expression;
+    }
+    interface JsxClosingElement extends Node {
+        kind: SyntaxKind.JsxClosingElement;
+        parent: JsxElement;
+        tagName: JsxTagNameExpression;
+    }
+    interface JsxExpression extends Expression {
+        kind: SyntaxKind.JsxExpression;
+        parent: JsxElement | JsxAttributeLike;
+        dotDotDotToken?: Token<SyntaxKind.DotDotDotToken>;
+        expression?: Expression;
+    }
+    interface JsxText extends Node {
+        kind: SyntaxKind.JsxText;
+        containsOnlyWhiteSpaces: boolean;
+        parent: JsxElement;
+    }
+    type JsxChild = JsxText | JsxExpression | JsxElement | JsxSelfClosingElement | JsxFragment;
+    interface Statement extends Node {
+        _statementBrand: any;
+    }
+    interface NotEmittedStatement extends Statement {
+        kind: SyntaxKind.NotEmittedStatement;
+    }
+    /**
+     * Marks the end of transformed declaration to properly emit exports.
+     */
+    interface EndOfDeclarationMarker extends Statement {
+        kind: SyntaxKind.EndOfDeclarationMarker;
+    }
+    /**
+     * A list of comma-separated expressions. This node is only created by transformations.
+     */
+    interface CommaListExpression extends Expression {
+        kind: SyntaxKind.CommaListExpression;
+        elements: NodeArray<Expression>;
+    }
+    /**
+     * Marks the beginning of a merged transformed declaration.
+     */
+    interface MergeDeclarationMarker extends Statement {
+        kind: SyntaxKind.MergeDeclarationMarker;
+    }
+    interface EmptyStatement extends Statement {
+        kind: SyntaxKind.EmptyStatement;
+    }
+    interface DebuggerStatement extends Statement {
+        kind: SyntaxKind.DebuggerStatement;
+    }
+    interface MissingDeclaration extends DeclarationStatement {
+        kind: SyntaxKind.MissingDeclaration;
+        name?: Identifier;
+    }
+    type BlockLike = SourceFile | Block | ModuleBlock | CaseOrDefaultClause;
+    interface Block extends Statement {
+        kind: SyntaxKind.Block;
+        statements: NodeArray<Statement>;
+        multiLine?: boolean;
+    }
+    interface VariableStatement extends Statement, JSDocContainer {
+        kind: SyntaxKind.VariableStatement;
+        declarationList: VariableDeclarationList;
+    }
+    interface ExpressionStatement extends Statement, JSDocContainer {
+        kind: SyntaxKind.ExpressionStatement;
+        expression: Expression;
+    }
+    interface PrologueDirective extends ExpressionStatement {
+        expression: StringLiteral;
+    }
+    interface IfStatement extends Statement {
+        kind: SyntaxKind.IfStatement;
+        expression: Expression;
+        thenStatement: Statement;
+        elseStatement?: Statement;
+    }
+    interface IterationStatement extends Statement {
+        statement: Statement;
+    }
+    interface DoStatement extends IterationStatement {
+        kind: SyntaxKind.DoStatement;
+        expression: Expression;
+    }
+    interface WhileStatement extends IterationStatement {
+        kind: SyntaxKind.WhileStatement;
+        expression: Expression;
+    }
+    type ForInitializer = VariableDeclarationList | Expression;
+    interface ForStatement extends IterationStatement {
+        kind: SyntaxKind.ForStatement;
+        initializer?: ForInitializer;
+        condition?: Expression;
+        incrementor?: Expression;
+    }
+    type ForInOrOfStatement = ForInStatement | ForOfStatement;
+    interface ForInStatement extends IterationStatement {
+        kind: SyntaxKind.ForInStatement;
+        initializer: ForInitializer;
+        expression: Expression;
+    }
+    interface ForOfStatement extends IterationStatement {
+        kind: SyntaxKind.ForOfStatement;
+        awaitModifier?: AwaitKeywordToken;
+        initializer: ForInitializer;
+        expression: Expression;
+    }
+    interface BreakStatement extends Statement {
+        kind: SyntaxKind.BreakStatement;
+        label?: Identifier;
+    }
+    interface ContinueStatement extends Statement {
+        kind: SyntaxKind.ContinueStatement;
+        label?: Identifier;
+    }
+    type BreakOrContinueStatement = BreakStatement | ContinueStatement;
+    interface ReturnStatement extends Statement {
+        kind: SyntaxKind.ReturnStatement;
+        expression?: Expression;
+    }
+    interface WithStatement extends Statement {
+        kind: SyntaxKind.WithStatement;
+        expression: Expression;
+        statement: Statement;
+    }
+    interface SwitchStatement extends Statement {
+        kind: SyntaxKind.SwitchStatement;
+        expression: Expression;
+        caseBlock: CaseBlock;
+        possiblyExhaustive?: boolean;
+    }
+    interface CaseBlock extends Node {
+        kind: SyntaxKind.CaseBlock;
+        parent: SwitchStatement;
+        clauses: NodeArray<CaseOrDefaultClause>;
+    }
+    interface CaseClause extends Node {
+        kind: SyntaxKind.CaseClause;
+        parent: CaseBlock;
+        expression: Expression;
+        statements: NodeArray<Statement>;
+    }
+    interface DefaultClause extends Node {
+        kind: SyntaxKind.DefaultClause;
+        parent: CaseBlock;
+        statements: NodeArray<Statement>;
+    }
+    type CaseOrDefaultClause = CaseClause | DefaultClause;
+    interface LabeledStatement extends Statement, JSDocContainer {
+        kind: SyntaxKind.LabeledStatement;
+        label: Identifier;
+        statement: Statement;
+    }
+    interface ThrowStatement extends Statement {
+        kind: SyntaxKind.ThrowStatement;
+        expression?: Expression;
+    }
+    interface TryStatement extends Statement {
+        kind: SyntaxKind.TryStatement;
+        tryBlock: Block;
+        catchClause?: CatchClause;
+        finallyBlock?: Block;
+    }
+    interface CatchClause extends Node {
+        kind: SyntaxKind.CatchClause;
+        parent: TryStatement;
+        variableDeclaration?: VariableDeclaration;
+        block: Block;
+    }
+    type ObjectTypeDeclaration = ClassLikeDeclaration | InterfaceDeclaration | TypeLiteralNode;
+    type DeclarationWithTypeParameters = SignatureDeclaration | ClassLikeDeclaration | InterfaceDeclaration | TypeAliasDeclaration | JSDocTemplateTag | JSDocTypedefTag | JSDocCallbackTag | JSDocSignature;
+    interface ClassLikeDeclarationBase extends NamedDeclaration, JSDocContainer {
+        kind: SyntaxKind.ClassDeclaration | SyntaxKind.ClassExpression;
+        name?: Identifier;
+        typeParameters?: NodeArray<TypeParameterDeclaration>;
+        heritageClauses?: NodeArray<HeritageClause>;
+        members: NodeArray<ClassElement>;
+    }
+    interface ClassDeclaration extends ClassLikeDeclarationBase, DeclarationStatement {
+        kind: SyntaxKind.ClassDeclaration;
+        /** May be undefined in `export default class { ... }`. */
+        name?: Identifier;
+    }
+    interface ClassExpression extends ClassLikeDeclarationBase, PrimaryExpression {
+        kind: SyntaxKind.ClassExpression;
+    }
+    type ClassLikeDeclaration = ClassDeclaration | ClassExpression;
+    interface ClassElement extends NamedDeclaration {
+        _classElementBrand: any;
+        name?: PropertyName;
+    }
+    interface TypeElement extends NamedDeclaration {
+        _typeElementBrand: any;
+        name?: PropertyName;
+        questionToken?: QuestionToken;
+    }
+    interface InterfaceDeclaration extends DeclarationStatement, JSDocContainer {
+        kind: SyntaxKind.InterfaceDeclaration;
+        name: Identifier;
+        typeParameters?: NodeArray<TypeParameterDeclaration>;
+        heritageClauses?: NodeArray<HeritageClause>;
+        members: NodeArray<TypeElement>;
+    }
+    interface HeritageClause extends Node {
+        kind: SyntaxKind.HeritageClause;
+        parent: InterfaceDeclaration | ClassLikeDeclaration;
+        token: SyntaxKind.ExtendsKeyword | SyntaxKind.ImplementsKeyword;
+        types: NodeArray<ExpressionWithTypeArguments>;
+    }
+    interface TypeAliasDeclaration extends DeclarationStatement, JSDocContainer {
+        kind: SyntaxKind.TypeAliasDeclaration;
+        name: Identifier;
+        typeParameters?: NodeArray<TypeParameterDeclaration>;
+        type: TypeNode;
+    }
+    interface EnumMember extends NamedDeclaration, JSDocContainer {
+        kind: SyntaxKind.EnumMember;
+        parent: EnumDeclaration;
+        name: PropertyName;
+        initializer?: Expression;
+    }
+    interface EnumDeclaration extends DeclarationStatement, JSDocContainer {
+        kind: SyntaxKind.EnumDeclaration;
+        name: Identifier;
+        members: NodeArray<EnumMember>;
+    }
+    type ModuleName = Identifier | StringLiteral;
+    type ModuleBody = NamespaceBody | JSDocNamespaceBody;
+    interface AmbientModuleDeclaration extends ModuleDeclaration {
+        body?: ModuleBlock;
+    }
+    interface ModuleDeclaration extends DeclarationStatement, JSDocContainer {
+        kind: SyntaxKind.ModuleDeclaration;
+        parent: ModuleBody | SourceFile;
+        name: ModuleName;
+        body?: ModuleBody | JSDocNamespaceDeclaration;
+    }
+    type NamespaceBody = ModuleBlock | NamespaceDeclaration;
+    interface NamespaceDeclaration extends ModuleDeclaration {
+        name: Identifier;
+        body: NamespaceBody;
+    }
+    type JSDocNamespaceBody = Identifier | JSDocNamespaceDeclaration;
+    interface JSDocNamespaceDeclaration extends ModuleDeclaration {
+        name: Identifier;
+        body?: JSDocNamespaceBody;
+    }
+    interface ModuleBlock extends Node, Statement {
+        kind: SyntaxKind.ModuleBlock;
+        parent: ModuleDeclaration;
+        statements: NodeArray<Statement>;
+    }
+    type ModuleReference = EntityName | ExternalModuleReference;
+    /**
+     * One of:
+     * - import x = require("mod");
+     * - import x = M.x;
+     */
+    interface ImportEqualsDeclaration extends DeclarationStatement, JSDocContainer {
+        kind: SyntaxKind.ImportEqualsDeclaration;
+        parent: SourceFile | ModuleBlock;
+        name: Identifier;
+        moduleReference: ModuleReference;
+    }
+    interface ExternalModuleReference extends Node {
+        kind: SyntaxKind.ExternalModuleReference;
+        parent: ImportEqualsDeclaration;
+        expression: Expression;
+    }
+    interface ImportDeclaration extends Statement {
+        kind: SyntaxKind.ImportDeclaration;
+        parent: SourceFile | ModuleBlock;
+        importClause?: ImportClause;
+        /** If this is not a StringLiteral it will be a grammar error. */
+        moduleSpecifier: Expression;
+    }
+    type NamedImportBindings = NamespaceImport | NamedImports;
+    interface ImportClause extends NamedDeclaration {
+        kind: SyntaxKind.ImportClause;
+        parent: ImportDeclaration;
+        name?: Identifier;
+        namedBindings?: NamedImportBindings;
+    }
+    interface NamespaceImport extends NamedDeclaration {
+        kind: SyntaxKind.NamespaceImport;
+        parent: ImportClause;
+        name: Identifier;
+    }
+    interface NamespaceExportDeclaration extends DeclarationStatement {
+        kind: SyntaxKind.NamespaceExportDeclaration;
+        name: Identifier;
+    }
+    interface ExportDeclaration extends DeclarationStatement {
+        kind: SyntaxKind.ExportDeclaration;
+        parent: SourceFile | ModuleBlock;
+        /** Will not be assigned in the case of `export * from "foo";` */
+        exportClause?: NamedExports;
+        /** If this is not a StringLiteral it will be a grammar error. */
+        moduleSpecifier?: Expression;
+    }
+    interface NamedImports extends Node {
+        kind: SyntaxKind.NamedImports;
+        parent: ImportClause;
+        elements: NodeArray<ImportSpecifier>;
+    }
+    interface NamedExports extends Node {
+        kind: SyntaxKind.NamedExports;
+        parent: ExportDeclaration;
+        elements: NodeArray<ExportSpecifier>;
+    }
+    type NamedImportsOrExports = NamedImports | NamedExports;
+    interface ImportSpecifier extends NamedDeclaration {
+        kind: SyntaxKind.ImportSpecifier;
+        parent: NamedImports;
+        propertyName?: Identifier;
+        name: Identifier;
+    }
+    interface ExportSpecifier extends NamedDeclaration {
+        kind: SyntaxKind.ExportSpecifier;
+        parent: NamedExports;
+        propertyName?: Identifier;
+        name: Identifier;
+    }
+    type ImportOrExportSpecifier = ImportSpecifier | ExportSpecifier;
+    /**
+     * This is either an `export =` or an `export default` declaration.
+     * Unless `isExportEquals` is set, this node was parsed as an `export default`.
+     */
+    interface ExportAssignment extends DeclarationStatement {
+        kind: SyntaxKind.ExportAssignment;
+        parent: SourceFile;
+        isExportEquals?: boolean;
+        expression: Expression;
+    }
+    interface FileReference extends TextRange {
+        fileName: string;
+    }
+    interface CheckJsDirective extends TextRange {
+        enabled: boolean;
+    }
+    type CommentKind = SyntaxKind.SingleLineCommentTrivia | SyntaxKind.MultiLineCommentTrivia;
+    interface CommentRange extends TextRange {
+        hasTrailingNewLine?: boolean;
+        kind: CommentKind;
+    }
+    interface SynthesizedComment extends CommentRange {
+        text: string;
+        pos: -1;
+        end: -1;
+    }
+    interface JSDocTypeExpression extends TypeNode {
+        kind: SyntaxKind.JSDocTypeExpression;
+        type: TypeNode;
+    }
+    interface JSDocType extends TypeNode {
+        _jsDocTypeBrand: any;
+    }
+    interface JSDocAllType extends JSDocType {
+        kind: SyntaxKind.JSDocAllType;
+    }
+    interface JSDocUnknownType extends JSDocType {
+        kind: SyntaxKind.JSDocUnknownType;
+    }
+    interface JSDocNonNullableType extends JSDocType {
+        kind: SyntaxKind.JSDocNonNullableType;
+        type: TypeNode;
+    }
+    interface JSDocNullableType extends JSDocType {
+        kind: SyntaxKind.JSDocNullableType;
+        type: TypeNode;
+    }
+    interface JSDocOptionalType extends JSDocType {
+        kind: SyntaxKind.JSDocOptionalType;
+        type: TypeNode;
+    }
+    interface JSDocFunctionType extends JSDocType, SignatureDeclarationBase {
+        kind: SyntaxKind.JSDocFunctionType;
+    }
+    interface JSDocVariadicType extends JSDocType {
+        kind: SyntaxKind.JSDocVariadicType;
+        type: TypeNode;
+    }
+    type JSDocTypeReferencingNode = JSDocVariadicType | JSDocOptionalType | JSDocNullableType | JSDocNonNullableType;
+    interface JSDoc extends Node {
+        kind: SyntaxKind.JSDocComment;
+        parent: HasJSDoc;
+        tags?: NodeArray<JSDocTag>;
+        comment?: string;
+    }
+    interface JSDocTag extends Node {
+        parent: JSDoc | JSDocTypeLiteral;
+        atToken: AtToken;
+        tagName: Identifier;
+        comment?: string;
+    }
+    interface JSDocUnknownTag extends JSDocTag {
+        kind: SyntaxKind.JSDocTag;
+    }
+    /**
+     * Note that `@extends` is a synonym of `@augments`.
+     * Both tags are represented by this interface.
+     */
+    interface JSDocAugmentsTag extends JSDocTag {
+        kind: SyntaxKind.JSDocAugmentsTag;
+        class: ExpressionWithTypeArguments & {
+            expression: Identifier | PropertyAccessEntityNameExpression;
+        };
+    }
+    interface JSDocClassTag extends JSDocTag {
+        kind: SyntaxKind.JSDocClassTag;
+    }
+    interface JSDocTemplateTag extends JSDocTag {
+        kind: SyntaxKind.JSDocTemplateTag;
+        typeParameters: NodeArray<TypeParameterDeclaration>;
+    }
+    interface JSDocReturnTag extends JSDocTag {
+        kind: SyntaxKind.JSDocReturnTag;
+        typeExpression?: JSDocTypeExpression;
+    }
+    interface JSDocTypeTag extends JSDocTag {
+        kind: SyntaxKind.JSDocTypeTag;
+        typeExpression?: JSDocTypeExpression;
+    }
+    interface JSDocTypedefTag extends JSDocTag, NamedDeclaration {
+        parent: JSDoc;
+        kind: SyntaxKind.JSDocTypedefTag;
+        fullName?: JSDocNamespaceDeclaration | Identifier;
+        name?: Identifier;
+        typeExpression?: JSDocTypeExpression | JSDocTypeLiteral;
+    }
+    interface JSDocCallbackTag extends JSDocTag, NamedDeclaration {
+        parent: JSDoc;
+        kind: SyntaxKind.JSDocCallbackTag;
+        fullName?: JSDocNamespaceDeclaration | Identifier;
+        name?: Identifier;
+        typeExpression: JSDocSignature;
+    }
+    interface JSDocSignature extends JSDocType, Declaration {
+        kind: SyntaxKind.JSDocSignature;
+        typeParameters?: ReadonlyArray<JSDocTemplateTag>;
+        parameters: ReadonlyArray<JSDocParameterTag>;
+        type: JSDocReturnTag | undefined;
+    }
+    interface JSDocPropertyLikeTag extends JSDocTag, Declaration {
+        parent: JSDoc;
+        name: EntityName;
+        typeExpression?: JSDocTypeExpression;
+        /** Whether the property name came before the type -- non-standard for JSDoc, but Typescript-like */
+        isNameFirst: boolean;
+        isBracketed: boolean;
+    }
+    interface JSDocPropertyTag extends JSDocPropertyLikeTag {
+        kind: SyntaxKind.JSDocPropertyTag;
+    }
+    interface JSDocParameterTag extends JSDocPropertyLikeTag {
+        kind: SyntaxKind.JSDocParameterTag;
+    }
+    interface JSDocTypeLiteral extends JSDocType {
+        kind: SyntaxKind.JSDocTypeLiteral;
+        jsDocPropertyTags?: ReadonlyArray<JSDocPropertyLikeTag>;
+        /** If true, then this type literal represents an *array* of its type. */
+        isArrayType?: boolean;
+    }
+    enum FlowFlags {
+        Unreachable = 1,
+        Start = 2,
+        BranchLabel = 4,
+        LoopLabel = 8,
+        Assignment = 16,
+        TrueCondition = 32,
+        FalseCondition = 64,
+        SwitchClause = 128,
+        ArrayMutation = 256,
+        Referenced = 512,
+        Shared = 1024,
+        PreFinally = 2048,
+        AfterFinally = 4096,
+        Label = 12,
+        Condition = 96
+    }
+    interface FlowLock {
+        locked?: boolean;
+    }
+    interface AfterFinallyFlow extends FlowNodeBase, FlowLock {
+        antecedent: FlowNode;
+    }
+    interface PreFinallyFlow extends FlowNodeBase {
+        antecedent: FlowNode;
+        lock: FlowLock;
+    }
+    type FlowNode = AfterFinallyFlow | PreFinallyFlow | FlowStart | FlowLabel | FlowAssignment | FlowCondition | FlowSwitchClause | FlowArrayMutation;
+    interface FlowNodeBase {
+        flags: FlowFlags;
+        id?: number;
+    }
+    interface FlowStart extends FlowNodeBase {
+        container?: FunctionExpression | ArrowFunction | MethodDeclaration;
+    }
+    interface FlowLabel extends FlowNodeBase {
+        antecedents: FlowNode[] | undefined;
+    }
+    interface FlowAssignment extends FlowNodeBase {
+        node: Expression | VariableDeclaration | BindingElement;
+        antecedent: FlowNode;
+    }
+    interface FlowCondition extends FlowNodeBase {
+        expression: Expression;
+        antecedent: FlowNode;
+    }
+    interface FlowSwitchClause extends FlowNodeBase {
+        switchStatement: SwitchStatement;
+        clauseStart: number;
+        clauseEnd: number;
+        antecedent: FlowNode;
+    }
+    interface FlowArrayMutation extends FlowNodeBase {
+        node: CallExpression | BinaryExpression;
+        antecedent: FlowNode;
+    }
+    type FlowType = Type | IncompleteType;
+    interface IncompleteType {
+        flags: TypeFlags;
+        type: Type;
+    }
+    interface AmdDependency {
+        path: string;
+        name?: string;
+    }
+    /**
+     * Subset of properties from SourceFile that are used in multiple utility functions
+     */
+    interface SourceFileLike {
+        readonly text: string;
+        lineMap?: ReadonlyArray<number>;
+    }
+    interface RedirectInfo {
+        /** Source file this redirects to. */
+        readonly redirectTarget: SourceFile;
+        /**
+         * Source file for the duplicate package. This will not be used by the Program,
+         * but we need to keep this around so we can watch for changes in underlying.
+         */
+        readonly unredirected: SourceFile;
+    }
+    interface SourceFile extends Declaration {
+        kind: SyntaxKind.SourceFile;
+        statements: NodeArray<Statement>;
+        endOfFileToken: Token<SyntaxKind.EndOfFileToken>;
+        fileName: string;
+        path: Path;
+        text: string;
+        resolvedPath: Path;
+        /**
+         * If two source files are for the same version of the same package, one will redirect to the other.
+         * (See `createRedirectSourceFile` in program.ts.)
+         * The redirect will have this set. The redirected-to source file will be in `redirectTargetsSet`.
+         */
+        redirectInfo?: RedirectInfo;
+        amdDependencies: ReadonlyArray<AmdDependency>;
+        moduleName?: string;
+        referencedFiles: ReadonlyArray<FileReference>;
+        typeReferenceDirectives: ReadonlyArray<FileReference>;
+        libReferenceDirectives: ReadonlyArray<FileReference>;
+        languageVariant: LanguageVariant;
+        isDeclarationFile: boolean;
+        renamedDependencies?: ReadonlyMap<string>;
+        /**
+         * lib.d.ts should have a reference comment like
+         *
+         *  /// <reference no-default-lib="true"/>
+         *
+         * If any other file has this comment, it signals not to include lib.d.ts
+         * because this containing file is intended to act as a default library.
+         */
+        hasNoDefaultLib: boolean;
+        languageVersion: ScriptTarget;
+        scriptKind: ScriptKind;
+        /**
+         * The first "most obvious" node that makes a file an external module.
+         * This is intended to be the first top-level import/export,
+         * but could be arbitrarily nested (e.g. `import.meta`).
+         */
+        externalModuleIndicator?: Node;
+        commonJsModuleIndicator?: Node;
+        identifiers: Map<string>;
+        nodeCount: number;
+        identifierCount: number;
+        symbolCount: number;
+        parseDiagnostics: DiagnosticWithLocation[];
+        bindDiagnostics: DiagnosticWithLocation[];
+        bindSuggestionDiagnostics?: DiagnosticWithLocation[];
+        jsDocDiagnostics?: DiagnosticWithLocation[];
+        additionalSyntacticDiagnostics?: ReadonlyArray<DiagnosticWithLocation>;
+        lineMap: ReadonlyArray<number>;
+        classifiableNames?: ReadonlyUnderscoreEscapedMap<true>;
+        resolvedModules?: Map<ResolvedModuleFull | undefined>;
+        resolvedTypeReferenceDirectiveNames: Map<ResolvedTypeReferenceDirective>;
+        imports: ReadonlyArray<StringLiteralLike>;
+        /**
+         * When a file's references are redirected due to project reference directives,
+         * the original names of the references are stored in this array
+         */
+        redirectedReferences?: ReadonlyArray<string>;
+        moduleAugmentations: ReadonlyArray<StringLiteral | Identifier>;
+        patternAmbientModules?: PatternAmbientModule[];
+        ambientModuleNames: ReadonlyArray<string>;
+        checkJsDirective?: CheckJsDirective;
+        version: string;
+        pragmas: PragmaMap;
+        localJsxNamespace?: __String;
+        localJsxFactory?: EntityName;
+    }
+    interface Bundle extends Node {
+        kind: SyntaxKind.Bundle;
+        prepends: ReadonlyArray<InputFiles | UnparsedSource>;
+        sourceFiles: ReadonlyArray<SourceFile>;
+        syntheticFileReferences?: ReadonlyArray<FileReference>;
+        syntheticTypeReferences?: ReadonlyArray<FileReference>;
+        hasNoDefaultLib?: boolean;
+    }
+    interface InputFiles extends Node {
+        kind: SyntaxKind.InputFiles;
+        javascriptText: string;
+        javascriptMapText?: string;
+        declarationText: string;
+        declarationMapText?: string;
+    }
+    interface UnparsedSource extends Node {
+        kind: SyntaxKind.UnparsedSource;
+        text: string;
+        sourceMapText?: string;
+    }
+    interface JsonSourceFile extends SourceFile {
+        statements: NodeArray<JsonObjectExpressionStatement>;
+    }
+    interface TsConfigSourceFile extends JsonSourceFile {
+        extendedSourceFiles?: string[];
+    }
+    interface JsonMinusNumericLiteral extends PrefixUnaryExpression {
+        kind: SyntaxKind.PrefixUnaryExpression;
+        operator: SyntaxKind.MinusToken;
+        operand: NumericLiteral;
+    }
+    interface JsonObjectExpressionStatement extends ExpressionStatement {
+        expression: ObjectLiteralExpression | ArrayLiteralExpression | JsonMinusNumericLiteral | NumericLiteral | StringLiteral | BooleanLiteral | NullLiteral;
+    }
+    interface ScriptReferenceHost {
+        getCompilerOptions(): CompilerOptions;
+        getSourceFile(fileName: string): SourceFile | undefined;
+        getSourceFileByPath(path: Path): SourceFile | undefined;
+        getCurrentDirectory(): string;
+    }
+    interface ParseConfigHost {
+        useCaseSensitiveFileNames: boolean;
+        readDirectory(rootDir: string, extensions: ReadonlyArray<string>, excludes: ReadonlyArray<string> | undefined, includes: ReadonlyArray<string>, depth?: number): string[];
+        /**
+         * Gets a value indicating whether the specified path exists and is a file.
+         * @param path The path to test.
+         */
+        fileExists(path: string): boolean;
+        readFile(path: string): string | undefined;
+    }
+    type WriteFileCallback = (fileName: string, data: string, writeByteOrderMark: boolean, onError: ((message: string) => void) | undefined, sourceFiles?: ReadonlyArray<SourceFile>) => void;
+    class OperationCanceledException {
+    }
+    interface CancellationToken {
+        isCancellationRequested(): boolean;
+        /** @throws OperationCanceledException if isCancellationRequested is true */
+        throwIfCancellationRequested(): void;
+    }
+    interface Program extends ScriptReferenceHost {
+        /**
+         * Get a list of root file names that were passed to a 'createProgram'
+         */
+        getRootFileNames(): ReadonlyArray<string>;
+        /**
+         * Get a list of files in the program
+         */
+        getSourceFiles(): ReadonlyArray<SourceFile>;
+        /**
+         * Get a list of file names that were passed to 'createProgram' or referenced in a
+         * program source file but could not be located.
+         */
+        getMissingFilePaths(): ReadonlyArray<Path>;
+        /**
+         * Emits the JavaScript and declaration files.  If targetSourceFile is not specified, then
+         * the JavaScript and declaration files will be produced for all the files in this program.
+         * If targetSourceFile is specified, then only the JavaScript and declaration for that
+         * specific file will be generated.
+         *
+         * If writeFile is not specified then the writeFile callback from the compiler host will be
+         * used for writing the JavaScript and declaration files.  Otherwise, the writeFile parameter
+         * will be invoked when writing the JavaScript and declaration files.
+         */
+        emit(targetSourceFile?: SourceFile, writeFile?: WriteFileCallback, cancellationToken?: CancellationToken, emitOnlyDtsFiles?: boolean, customTransformers?: CustomTransformers): EmitResult;
+        getOptionsDiagnostics(cancellationToken?: CancellationToken): ReadonlyArray<Diagnostic>;
+        getGlobalDiagnostics(cancellationToken?: CancellationToken): ReadonlyArray<Diagnostic>;
+        getSyntacticDiagnostics(sourceFile?: SourceFile, cancellationToken?: CancellationToken): ReadonlyArray<DiagnosticWithLocation>;
+        /** The first time this is called, it will return global diagnostics (no location). */
+        getSemanticDiagnostics(sourceFile?: SourceFile, cancellationToken?: CancellationToken): ReadonlyArray<Diagnostic>;
+        getDeclarationDiagnostics(sourceFile?: SourceFile, cancellationToken?: CancellationToken): ReadonlyArray<DiagnosticWithLocation>;
+        getConfigFileParsingDiagnostics(): ReadonlyArray<Diagnostic>;
+        getSuggestionDiagnostics(sourceFile: SourceFile, cancellationToken?: CancellationToken): ReadonlyArray<DiagnosticWithLocation>;
+        /**
+         * Gets a type checker that can be used to semantically analyze source files in the program.
+         */
+        getTypeChecker(): TypeChecker;
+        getCommonSourceDirectory(): string;
+        getDiagnosticsProducingTypeChecker(): TypeChecker;
+        dropDiagnosticsProducingTypeChecker(): void;
+        getClassifiableNames(): UnderscoreEscapedMap<true>;
+        getNodeCount(): number;
+        getIdentifierCount(): number;
+        getSymbolCount(): number;
+        getTypeCount(): number;
+        getFileProcessingDiagnostics(): DiagnosticCollection;
+        getResolvedTypeReferenceDirectives(): Map<ResolvedTypeReferenceDirective>;
+        isSourceFileFromExternalLibrary(file: SourceFile): boolean;
+        isSourceFileDefaultLibrary(file: SourceFile): boolean;
+        structureIsReused?: StructureIsReused;
+        getSourceFileFromReference(referencingFile: SourceFile, ref: FileReference): SourceFile | undefined;
+        getLibFileFromReference(ref: FileReference): SourceFile | undefined;
+        /** Given a source file, get the name of the package it was imported from. */
+        sourceFileToPackageName: Map<string>;
+        /** Set of all source files that some other source file redirects to. */
+        redirectTargetsSet: Map<true>;
+        /** Is the file emitted file */
+        isEmittedFile(file: string): boolean;
+        getResolvedModuleWithFailedLookupLocationsFromCache(moduleName: string, containingFile: string): ResolvedModuleWithFailedLookupLocations | undefined;
+        getProjectReferences(): (ResolvedProjectReference | undefined)[] | undefined;
+    }
+    interface ResolvedProjectReference {
+        commandLine: ParsedCommandLine;
+        sourceFile: SourceFile;
+    }
+    enum StructureIsReused {
+        Not = 0,
+        SafeModules = 1,
+        Completely = 2
+    }
+    interface CustomTransformers {
+        /** Custom transformers to evaluate before built-in .js transformations. */
+        before?: TransformerFactory<SourceFile>[];
+        /** Custom transformers to evaluate after built-in .js transformations. */
+        after?: TransformerFactory<SourceFile>[];
+        /** Custom transformers to evaluate after built-in .d.ts transformations. */
+        afterDeclarations?: TransformerFactory<Bundle | SourceFile>[];
+    }
+    interface SourceMapSpan {
+        /** Line number in the .js file. */
+        emittedLine: number;
+        /** Column number in the .js file. */
+        emittedColumn: number;
+        /** Line number in the .ts file. */
+        sourceLine: number;
+        /** Column number in the .ts file. */
+        sourceColumn: number;
+        /** Optional name (index into names array) associated with this span. */
+        nameIndex?: number;
+        /** .ts file (index into sources array) associated with this span */
+        sourceIndex: number;
+    }
+    interface SourceMapData {
+        sourceMapFilePath: string;
+        jsSourceMappingURL: string;
+        sourceMapFile: string;
+        sourceMapSourceRoot: string;
+        sourceMapSources: string[];
+        sourceMapSourcesContent?: string[];
+        inputSourceFileNames: string[];
+        sourceMapNames?: string[];
+        sourceMapMappings: string;
+        sourceMapDecodedMappings: SourceMapSpan[];
+    }
+    /** Return code used by getEmitOutput function to indicate status of the function */
+    enum ExitStatus {
+        Success = 0,
+        DiagnosticsPresent_OutputsSkipped = 1,
+        DiagnosticsPresent_OutputsGenerated = 2
+    }
+    interface EmitResult {
+        emitSkipped: boolean;
+        /** Contains declaration emit diagnostics */
+        diagnostics: ReadonlyArray<Diagnostic>;
+        emittedFiles?: string[];
+        sourceMaps?: SourceMapData[];
+    }
+    interface TypeCheckerHost {
+        getCompilerOptions(): CompilerOptions;
+        getSourceFiles(): ReadonlyArray<SourceFile>;
+        getSourceFile(fileName: string): SourceFile | undefined;
+        getResolvedTypeReferenceDirectives(): ReadonlyMap<ResolvedTypeReferenceDirective>;
+    }
+    interface TypeChecker {
+        getTypeOfSymbolAtLocation(symbol: Symbol, node: Node): Type;
+        getDeclaredTypeOfSymbol(symbol: Symbol): Type;
+        getPropertiesOfType(type: Type): Symbol[];
+        getPropertyOfType(type: Type, propertyName: string): Symbol | undefined;
+        getIndexInfoOfType(type: Type, kind: IndexKind): IndexInfo | undefined;
+        getSignaturesOfType(type: Type, kind: SignatureKind): Signature[];
+        getIndexTypeOfType(type: Type, kind: IndexKind): Type | undefined;
+        getBaseTypes(type: InterfaceType): BaseType[];
+        getBaseTypeOfLiteralType(type: Type): Type;
+        getWidenedType(type: Type): Type;
+        getReturnTypeOfSignature(signature: Signature): Type;
+        /**
+         * Gets the type of a parameter at a given position in a signature.
+         * Returns `any` if the index is not valid.
+         */
+        getParameterType(signature: Signature, parameterIndex: number): Type;
+        getNullableType(type: Type, flags: TypeFlags): Type;
+        getNonNullableType(type: Type): Type;
+        /** Note that the resulting nodes cannot be checked. */
+        typeToTypeNode(type: Type, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): TypeNode | undefined;
+        typeToTypeNode(type: Type, enclosingDeclaration?: Node, flags?: NodeBuilderFlags, tracker?: SymbolTracker): TypeNode | undefined;
+        /** Note that the resulting nodes cannot be checked. */
+        signatureToSignatureDeclaration(signature: Signature, kind: SyntaxKind, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): (SignatureDeclaration & {
+            typeArguments?: NodeArray<TypeNode>;
+        }) | undefined;
+        /** Note that the resulting nodes cannot be checked. */
+        indexInfoToIndexSignatureDeclaration(indexInfo: IndexInfo, kind: IndexKind, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): IndexSignatureDeclaration | undefined;
+        /** Note that the resulting nodes cannot be checked. */
+        symbolToEntityName(symbol: Symbol, meaning: SymbolFlags, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): EntityName | undefined;
+        /** Note that the resulting nodes cannot be checked. */
+        symbolToExpression(symbol: Symbol, meaning: SymbolFlags, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): Expression | undefined;
+        /** Note that the resulting nodes cannot be checked. */
+        symbolToTypeParameterDeclarations(symbol: Symbol, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): NodeArray<TypeParameterDeclaration> | undefined;
+        /** Note that the resulting nodes cannot be checked. */
+        symbolToParameterDeclaration(symbol: Symbol, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): ParameterDeclaration | undefined;
+        /** Note that the resulting nodes cannot be checked. */
+        typeParameterToDeclaration(parameter: TypeParameter, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): TypeParameterDeclaration | undefined;
+        getSymbolsInScope(location: Node, meaning: SymbolFlags): Symbol[];
+        getSymbolAtLocation(node: Node): Symbol | undefined;
+        getSymbolsOfParameterPropertyDeclaration(parameter: ParameterDeclaration, parameterName: string): Symbol[];
+        /**
+         * The function returns the value (local variable) symbol of an identifier in the short-hand property assignment.
+         * This is necessary as an identifier in short-hand property assignment can contains two meaning: property name and property value.
+         */
+        getShorthandAssignmentValueSymbol(location: Node): Symbol | undefined;
+        getExportSpecifierLocalTargetSymbol(location: ExportSpecifier): Symbol | undefined;
+        /**
+         * If a symbol is a local symbol with an associated exported symbol, returns the exported symbol.
+         * Otherwise returns its input.
+         * For example, at `export type T = number;`:
+         *     - `getSymbolAtLocation` at the location `T` will return the exported symbol for `T`.
+         *     - But the result of `getSymbolsInScope` will contain the *local* symbol for `T`, not the exported symbol.
+         *     - Calling `getExportSymbolOfSymbol` on that local symbol will return the exported symbol.
+         */
+        getExportSymbolOfSymbol(symbol: Symbol): Symbol;
+        getPropertySymbolOfDestructuringAssignment(location: Identifier): Symbol | undefined;
+        getTypeAtLocation(node: Node): Type | undefined;
+        getTypeFromTypeNode(node: TypeNode): Type;
+        signatureToString(signature: Signature, enclosingDeclaration?: Node, flags?: TypeFormatFlags, kind?: SignatureKind): string;
+        typeToString(type: Type, enclosingDeclaration?: Node, flags?: TypeFormatFlags): string;
+        symbolToString(symbol: Symbol, enclosingDeclaration?: Node, meaning?: SymbolFlags, flags?: SymbolFormatFlags): string;
+        typePredicateToString(predicate: TypePredicate, enclosingDeclaration?: Node, flags?: TypeFormatFlags): string;
+        writeSignature(signature: Signature, enclosingDeclaration?: Node, flags?: TypeFormatFlags, kind?: SignatureKind, writer?: EmitTextWriter): string;
+        writeType(type: Type, enclosingDeclaration?: Node, flags?: TypeFormatFlags, writer?: EmitTextWriter): string;
+        writeSymbol(symbol: Symbol, enclosingDeclaration?: Node, meaning?: SymbolFlags, flags?: SymbolFormatFlags, writer?: EmitTextWriter): string;
+        writeTypePredicate(predicate: TypePredicate, enclosingDeclaration?: Node, flags?: TypeFormatFlags, writer?: EmitTextWriter): string;
+        /**
+         * @deprecated Use the createX factory functions or XToY typechecker methods and `createPrinter` or the `xToString` methods instead
+         * This will be removed in a future version.
+         */
+        getSymbolDisplayBuilder(): SymbolDisplayBuilder;
+        getFullyQualifiedName(symbol: Symbol): string;
+        getAugmentedPropertiesOfType(type: Type): Symbol[];
+        getRootSymbols(symbol: Symbol): Symbol[];
+        getContextualType(node: Expression): Type | undefined;
+        getContextualTypeForArgumentAtIndex(call: CallLikeExpression, argIndex: number): Type | undefined;
+        getContextualTypeForJsxAttribute(attribute: JsxAttribute | JsxSpreadAttribute): Type | undefined;
+        isContextSensitive(node: Expression | MethodDeclaration | ObjectLiteralElementLike | JsxAttributeLike): boolean;
+        /**
+         * returns unknownSignature in the case of an error.
+         * returns undefined if the node is not valid.
+         * @param argumentCount Apparent number of arguments, passed in case of a possibly incomplete call. This should come from an ArgumentListInfo. See `signatureHelp.ts`.
+         */
+        getResolvedSignature(node: CallLikeExpression, candidatesOutArray?: Signature[], argumentCount?: number): Signature | undefined;
+        getSignatureFromDeclaration(declaration: SignatureDeclaration): Signature | undefined;
+        isImplementationOfOverload(node: SignatureDeclaration): boolean | undefined;
+        isUndefinedSymbol(symbol: Symbol): boolean;
+        isArgumentsSymbol(symbol: Symbol): boolean;
+        isUnknownSymbol(symbol: Symbol): boolean;
+        getMergedSymbol(symbol: Symbol): Symbol;
+        getConstantValue(node: EnumMember | PropertyAccessExpression | ElementAccessExpression): string | number | undefined;
+        isValidPropertyAccess(node: PropertyAccessExpression | QualifiedName | ImportTypeNode, propertyName: string): boolean;
+        /** Exclude accesses to private properties or methods with a `this` parameter that `type` doesn't satisfy. */
+        isValidPropertyAccessForCompletions(node: PropertyAccessExpression | ImportTypeNode, type: Type, property: Symbol): boolean;
+        /** Follow all aliases to get the original symbol. */
+        getAliasedSymbol(symbol: Symbol): Symbol;
+        /** Follow a *single* alias to get the immediately aliased symbol. */
+        getImmediateAliasedSymbol(symbol: Symbol): Symbol | undefined;
+        getExportsOfModule(moduleSymbol: Symbol): Symbol[];
+        /** Unlike `getExportsOfModule`, this includes properties of an `export =` value. */
+        getExportsAndPropertiesOfModule(moduleSymbol: Symbol): Symbol[];
+        getAllAttributesTypeFromJsxOpeningLikeElement(elementNode: JsxOpeningLikeElement): Type | undefined;
+        getJsxIntrinsicTagNamesAt(location: Node): Symbol[];
+        isOptionalParameter(node: ParameterDeclaration): boolean;
+        getAmbientModules(): Symbol[];
+        tryGetMemberInModuleExports(memberName: string, moduleSymbol: Symbol): Symbol | undefined;
+        /**
+         * Unlike `tryGetMemberInModuleExports`, this includes properties of an `export =` value.
+         * Does *not* return properties of primitive types.
+         */
+        tryGetMemberInModuleExportsAndProperties(memberName: string, moduleSymbol: Symbol): Symbol | undefined;
+        getApparentType(type: Type): Type;
+        getSuggestionForNonexistentProperty(node: Identifier, containingType: Type): string | undefined;
+        getSuggestionForNonexistentSymbol(location: Node, name: string, meaning: SymbolFlags): string | undefined;
+        getSuggestionForNonexistentModule(node: Identifier, target: Symbol): string | undefined;
+        getBaseConstraintOfType(type: Type): Type | undefined;
+        getDefaultFromTypeParameter(type: Type): Type | undefined;
+        getAnyType(): Type;
+        getStringType(): Type;
+        getNumberType(): Type;
+        getBooleanType(): Type;
+        getFalseType(): Type;
+        getTrueType(): Type;
+        getVoidType(): Type;
+        getUndefinedType(): Type;
+        getNullType(): Type;
+        getESSymbolType(): Type;
+        getNeverType(): Type;
+        getUnionType(types: Type[], subtypeReduction?: UnionReduction): Type;
+        createArrayType(elementType: Type): Type;
+        createPromiseType(type: Type): Type;
+        createAnonymousType(symbol: Symbol, members: SymbolTable, callSignatures: Signature[], constructSignatures: Signature[], stringIndexInfo: IndexInfo | undefined, numberIndexInfo: IndexInfo | undefined): Type;
+        createSignature(declaration: SignatureDeclaration, typeParameters: TypeParameter[] | undefined, thisParameter: Symbol | undefined, parameters: Symbol[], resolvedReturnType: Type, typePredicate: TypePredicate | undefined, minArgumentCount: number, hasRestParameter: boolean, hasLiteralTypes: boolean): Signature;
+        createSymbol(flags: SymbolFlags, name: __String): TransientSymbol;
+        createIndexInfo(type: Type, isReadonly: boolean, declaration?: SignatureDeclaration): IndexInfo;
+        isSymbolAccessible(symbol: Symbol, enclosingDeclaration: Node | undefined, meaning: SymbolFlags, shouldComputeAliasToMarkVisible: boolean): SymbolAccessibilityResult;
+        tryFindAmbientModuleWithoutAugmentations(moduleName: string): Symbol | undefined;
+        getSymbolWalker(accept?: (symbol: Symbol) => boolean): SymbolWalker;
+        getDiagnostics(sourceFile?: SourceFile, cancellationToken?: CancellationToken): Diagnostic[];
+        getGlobalDiagnostics(): Diagnostic[];
+        getEmitResolver(sourceFile?: SourceFile, cancellationToken?: CancellationToken): EmitResolver;
+        getNodeCount(): number;
+        getIdentifierCount(): number;
+        getSymbolCount(): number;
+        getTypeCount(): number;
+        isArrayLikeType(type: Type): boolean;
+        /**
+         * For a union, will include a property if it's defined in *any* of the member types.
+         * So for `{ a } | { b }`, this will include both `a` and `b`.
+         * Does not include properties of primitive types.
+         */
+        getAllPossiblePropertiesOfTypes(type: ReadonlyArray<Type>): Symbol[];
+        resolveName(name: string, location: Node, meaning: SymbolFlags, excludeGlobals: boolean): Symbol | undefined;
+        getJsxNamespace(location?: Node): string;
+        /**
+         * Note that this will return undefined in the following case:
+         *     // a.ts
+         *     export namespace N { export class C { } }
+         *     // b.ts
+         *     <<enclosingDeclaration>>
+         * Where `C` is the symbol we're looking for.
+         * This should be called in a loop climbing parents of the symbol, so we'll get `N`.
+         */
+        getAccessibleSymbolChain(symbol: Symbol, enclosingDeclaration: Node | undefined, meaning: SymbolFlags, useOnlyExternalAliasing: boolean): Symbol[] | undefined;
+        getTypePredicateOfSignature(signature: Signature): TypePredicate;
+        resolveExternalModuleSymbol(symbol: Symbol): Symbol;
+        /** @param node A location where we might consider accessing `this`. Not necessarily a ThisExpression. */
+        tryGetThisTypeAt(node: Node): Type | undefined;
+        getTypeArgumentConstraint(node: TypeNode): Type | undefined;
+        /**
+         * Does *not* get *all* suggestion diagnostics, just the ones that were convenient to report in the checker.
+         * Others are added in computeSuggestionDiagnostics.
+         */
+        getSuggestionDiagnostics(file: SourceFile, cancellationToken?: CancellationToken): ReadonlyArray<DiagnosticWithLocation>;
+        /**
+         * Depending on the operation performed, it may be appropriate to throw away the checker
+         * if the cancellation token is triggered. Typically, if it is used for error checking
+         * and the operation is cancelled, then it should be discarded, otherwise it is safe to keep.
+         */
+        runWithCancellationToken<T>(token: CancellationToken, cb: (checker: TypeChecker) => T): T;
+    }
+    enum UnionReduction {
+        None = 0,
+        Literal = 1,
+        Subtype = 2
+    }
+    enum NodeBuilderFlags {
+        None = 0,
+        NoTruncation = 1,
+        WriteArrayAsGenericType = 2,
+        GenerateNamesForShadowedTypeParams = 4,
+        UseStructuralFallback = 8,
+        ForbidIndexedAccessSymbolReferences = 16,
+        WriteTypeArgumentsOfSignature = 32,
+        UseFullyQualifiedType = 64,
+        UseOnlyExternalAliasing = 128,
+        SuppressAnyReturnType = 256,
+        WriteTypeParametersInQualifiedName = 512,
+        MultilineObjectLiterals = 1024,
+        WriteClassExpressionAsTypeLiteral = 2048,
+        UseTypeOfFunction = 4096,
+        OmitParameterModifiers = 8192,
+        UseAliasDefinedOutsideCurrentScope = 16384,
+        AllowThisInObjectLiteral = 32768,
+        AllowQualifedNameInPlaceOfIdentifier = 65536,
+        AllowAnonymousIdentifier = 131072,
+        AllowEmptyUnionOrIntersection = 262144,
+        AllowEmptyTuple = 524288,
+        AllowUniqueESSymbolType = 1048576,
+        AllowEmptyIndexInfoType = 2097152,
+        IgnoreErrors = 3112960,
+        InObjectTypeLiteral = 4194304,
+        InTypeAlias = 8388608,
+        InInitialEntityName = 16777216,
+        InReverseMappedType = 33554432
+    }
+    enum TypeFormatFlags {
+        None = 0,
+        NoTruncation = 1,
+        WriteArrayAsGenericType = 2,
+        UseStructuralFallback = 8,
+        WriteTypeArgumentsOfSignature = 32,
+        UseFullyQualifiedType = 64,
+        SuppressAnyReturnType = 256,
+        MultilineObjectLiterals = 1024,
+        WriteClassExpressionAsTypeLiteral = 2048,
+        UseTypeOfFunction = 4096,
+        OmitParameterModifiers = 8192,
+        UseAliasDefinedOutsideCurrentScope = 16384,
+        AllowUniqueESSymbolType = 1048576,
+        AddUndefined = 131072,
+        WriteArrowStyleSignature = 262144,
+        InArrayType = 524288,
+        InElementType = 2097152,
+        InFirstTypeArgument = 4194304,
+        InTypeAlias = 8388608,
+        /** @deprecated */ WriteOwnNameForAnyLike = 0,
+        NodeBuilderFlagsMask = 9469291
+    }
+    enum SymbolFormatFlags {
+        None = 0,
+        WriteTypeParametersOrArguments = 1,
+        UseOnlyExternalAliasing = 2,
+        AllowAnyNodeKind = 4,
+        UseAliasDefinedOutsideCurrentScope = 8
+    }
+    interface SymbolWalker {
+        /** Note: Return values are not ordered. */
+        walkType(root: Type): {
+            visitedTypes: ReadonlyArray<Type>;
+            visitedSymbols: ReadonlyArray<Symbol>;
+        };
+        /** Note: Return values are not ordered. */
+        walkSymbol(root: Symbol): {
+            visitedTypes: ReadonlyArray<Type>;
+            visitedSymbols: ReadonlyArray<Symbol>;
+        };
+    }
+    /**
+     * @deprecated
+     */
+    interface SymbolDisplayBuilder {
+        /** @deprecated */ buildTypeDisplay(type: Type, writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags): void;
+        /** @deprecated */ buildSymbolDisplay(symbol: Symbol, writer: SymbolWriter, enclosingDeclaration?: Node, meaning?: SymbolFlags, flags?: SymbolFormatFlags): void;
+        /** @deprecated */ buildSignatureDisplay(signature: Signature, writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags, kind?: SignatureKind): void;
+        /** @deprecated */ buildIndexSignatureDisplay(info: IndexInfo, writer: SymbolWriter, kind: IndexKind, enclosingDeclaration?: Node, globalFlags?: TypeFormatFlags, symbolStack?: Symbol[]): void;
+        /** @deprecated */ buildParameterDisplay(parameter: Symbol, writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags): void;
+        /** @deprecated */ buildTypeParameterDisplay(tp: TypeParameter, writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags): void;
+        /** @deprecated */ buildTypePredicateDisplay(predicate: TypePredicate, writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags): void;
+        /** @deprecated */ buildTypeParameterDisplayFromSymbol(symbol: Symbol, writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags): void;
+        /** @deprecated */ buildDisplayForParametersAndDelimiters(thisParameter: Symbol, parameters: Symbol[], writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags): void;
+        /** @deprecated */ buildDisplayForTypeParametersAndDelimiters(typeParameters: TypeParameter[], writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags): void;
+        /** @deprecated */ buildReturnTypeDisplay(signature: Signature, writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags): void;
+    }
+    /**
+     * @deprecated Migrate to other methods of generating symbol names, ex symbolToEntityName + a printer or symbolToString
+     */
+    interface SymbolWriter extends SymbolTracker {
+        writeKeyword(text: string): void;
+        writeOperator(text: string): void;
+        writePunctuation(text: string): void;
+        writeSpace(text: string): void;
+        writeStringLiteral(text: string): void;
+        writeParameter(text: string): void;
+        writeProperty(text: string): void;
+        writeSymbol(text: string, symbol: Symbol): void;
+        writeLine(): void;
+        increaseIndent(): void;
+        decreaseIndent(): void;
+        clear(): void;
+    }
+    enum SymbolAccessibility {
+        Accessible = 0,
+        NotAccessible = 1,
+        CannotBeNamed = 2
+    }
+    enum SyntheticSymbolKind {
+        UnionOrIntersection = 0,
+        Spread = 1
+    }
+    enum TypePredicateKind {
+        This = 0,
+        Identifier = 1
+    }
+    interface TypePredicateBase {
+        kind: TypePredicateKind;
+        type: Type;
+    }
+    interface ThisTypePredicate extends TypePredicateBase {
+        kind: TypePredicateKind.This;
+    }
+    interface IdentifierTypePredicate extends TypePredicateBase {
+        kind: TypePredicateKind.Identifier;
+        parameterName: string;
+        parameterIndex: number;
+    }
+    type TypePredicate = IdentifierTypePredicate | ThisTypePredicate;
+    type AnyImportSyntax = ImportDeclaration | ImportEqualsDeclaration;
+    type AnyImportOrReExport = AnyImportSyntax | ExportDeclaration;
+    interface ValidImportTypeNode extends ImportTypeNode {
+        argument: LiteralTypeNode & {
+            literal: StringLiteral;
+        };
+    }
+    type AnyValidImportOrReExport = (ImportDeclaration | ExportDeclaration) & {
+        moduleSpecifier: StringLiteral;
+    } | ImportEqualsDeclaration & {
+        moduleReference: ExternalModuleReference & {
+            expression: StringLiteral;
+        };
+    } | RequireOrImportCall | ValidImportTypeNode;
+    type RequireOrImportCall = CallExpression & {
+        arguments: [StringLiteralLike];
+    };
+    type LateVisibilityPaintedStatement = AnyImportSyntax | VariableStatement | ClassDeclaration | FunctionDeclaration | ModuleDeclaration | TypeAliasDeclaration | InterfaceDeclaration | EnumDeclaration;
+    interface SymbolVisibilityResult {
+        accessibility: SymbolAccessibility;
+        aliasesToMakeVisible?: LateVisibilityPaintedStatement[];
+        errorSymbolName?: string;
+        errorNode?: Node;
+    }
+    interface SymbolAccessibilityResult extends SymbolVisibilityResult {
+        errorModuleName?: string;
+    }
+    interface AllAccessorDeclarations {
+        firstAccessor: AccessorDeclaration;
+        secondAccessor: AccessorDeclaration | undefined;
+        getAccessor: AccessorDeclaration | undefined;
+        setAccessor: AccessorDeclaration | undefined;
+    }
+    /** Indicates how to serialize the name for a TypeReferenceNode when emitting decorator metadata */
+    enum TypeReferenceSerializationKind {
+        Unknown = 0,
+        TypeWithConstructSignatureAndValue = 1,
+        VoidNullableOrNeverType = 2,
+        NumberLikeType = 3,
+        StringLikeType = 4,
+        BooleanType = 5,
+        ArrayLikeType = 6,
+        ESSymbolType = 7,
+        Promise = 8,
+        TypeWithCallSignature = 9,
+        ObjectType = 10
+    }
+    interface EmitResolver {
+        hasGlobalName(name: string): boolean;
+        getReferencedExportContainer(node: Identifier, prefixLocals?: boolean): SourceFile | ModuleDeclaration | EnumDeclaration | undefined;
+        getReferencedImportDeclaration(node: Identifier): Declaration | undefined;
+        getReferencedDeclarationWithCollidingName(node: Identifier): Declaration | undefined;
+        isDeclarationWithCollidingName(node: Declaration): boolean;
+        isValueAliasDeclaration(node: Node): boolean;
+        isReferencedAliasDeclaration(node: Node, checkChildren?: boolean): boolean;
+        isTopLevelValueImportEqualsWithEntityName(node: ImportEqualsDeclaration): boolean;
+        getNodeCheckFlags(node: Node): NodeCheckFlags;
+        isDeclarationVisible(node: Declaration | AnyImportSyntax): boolean;
+        isLateBound(node: Declaration): node is LateBoundDeclaration;
+        collectLinkedAliases(node: Identifier): Node[] | undefined;
+        isImplementationOfOverload(node: FunctionLike): boolean | undefined;
+        isRequiredInitializedParameter(node: ParameterDeclaration): boolean;
+        isOptionalUninitializedParameterProperty(node: ParameterDeclaration): boolean;
+        createTypeOfDeclaration(declaration: AccessorDeclaration | VariableLikeDeclaration, enclosingDeclaration: Node, flags: NodeBuilderFlags, tracker: SymbolTracker, addUndefined?: boolean): TypeNode | undefined;
+        createReturnTypeOfSignatureDeclaration(signatureDeclaration: SignatureDeclaration, enclosingDeclaration: Node, flags: NodeBuilderFlags, tracker: SymbolTracker): TypeNode | undefined;
+        createTypeOfExpression(expr: Expression, enclosingDeclaration: Node, flags: NodeBuilderFlags, tracker: SymbolTracker): TypeNode | undefined;
+        createLiteralConstValue(node: VariableDeclaration | PropertyDeclaration | PropertySignature | ParameterDeclaration): Expression;
+        isSymbolAccessible(symbol: Symbol, enclosingDeclaration: Node | undefined, meaning: SymbolFlags | undefined, shouldComputeAliasToMarkVisible: boolean): SymbolAccessibilityResult;
+        isEntityNameVisible(entityName: EntityNameOrEntityNameExpression, enclosingDeclaration: Node): SymbolVisibilityResult;
+        getConstantValue(node: EnumMember | PropertyAccessExpression | ElementAccessExpression): string | number | undefined;
+        getReferencedValueDeclaration(reference: Identifier): Declaration | undefined;
+        getTypeReferenceSerializationKind(typeName: EntityName, location?: Node): TypeReferenceSerializationKind;
+        isOptionalParameter(node: ParameterDeclaration): boolean;
+        moduleExportsSomeValue(moduleReferenceExpression: Expression): boolean;
+        isArgumentsLocalBinding(node: Identifier): boolean;
+        getExternalModuleFileFromDeclaration(declaration: ImportEqualsDeclaration | ImportDeclaration | ExportDeclaration | ModuleDeclaration | ImportTypeNode): SourceFile | undefined;
+        getTypeReferenceDirectivesForEntityName(name: EntityNameOrEntityNameExpression): string[] | undefined;
+        getTypeReferenceDirectivesForSymbol(symbol: Symbol, meaning?: SymbolFlags): string[] | undefined;
+        isLiteralConstDeclaration(node: VariableDeclaration | PropertyDeclaration | PropertySignature | ParameterDeclaration): boolean;
+        getJsxFactoryEntity(location?: Node): EntityName | undefined;
+        getAllAccessorDeclarations(declaration: AccessorDeclaration): AllAccessorDeclarations;
+    }
+    enum SymbolFlags {
+        None = 0,
+        FunctionScopedVariable = 1,
+        BlockScopedVariable = 2,
+        Property = 4,
+        EnumMember = 8,
+        Function = 16,
+        Class = 32,
+        Interface = 64,
+        ConstEnum = 128,
+        RegularEnum = 256,
+        ValueModule = 512,
+        NamespaceModule = 1024,
+        TypeLiteral = 2048,
+        ObjectLiteral = 4096,
+        Method = 8192,
+        Constructor = 16384,
+        GetAccessor = 32768,
+        SetAccessor = 65536,
+        Signature = 131072,
+        TypeParameter = 262144,
+        TypeAlias = 524288,
+        ExportValue = 1048576,
+        Alias = 2097152,
+        Prototype = 4194304,
+        ExportStar = 8388608,
+        Optional = 16777216,
+        Transient = 33554432,
+        JSContainer = 67108864,
+        All = 67108863,
+        Enum = 384,
+        Variable = 3,
+        Value = 67216319,
+        Type = 67901928,
+        Namespace = 1920,
+        Module = 1536,
+        Accessor = 98304,
+        FunctionScopedVariableExcludes = 67216318,
+        BlockScopedVariableExcludes = 67216319,
+        ParameterExcludes = 67216319,
+        PropertyExcludes = 0,
+        EnumMemberExcludes = 68008959,
+        FunctionExcludes = 67215791,
+        ClassExcludes = 68008383,
+        InterfaceExcludes = 67901832,
+        RegularEnumExcludes = 68008191,
+        ConstEnumExcludes = 68008831,
+        ValueModuleExcludes = 67215503,
+        NamespaceModuleExcludes = 0,
+        MethodExcludes = 67208127,
+        GetAccessorExcludes = 67150783,
+        SetAccessorExcludes = 67183551,
+        TypeParameterExcludes = 67639784,
+        TypeAliasExcludes = 67901928,
+        AliasExcludes = 2097152,
+        ModuleMember = 2623475,
+        ExportHasLocal = 944,
+        HasExports = 1952,
+        HasMembers = 6240,
+        BlockScoped = 418,
+        PropertyOrAccessor = 98308,
+        ClassMember = 106500,
+        Classifiable = 2885600,
+        LateBindingContainer = 6240
+    }
+    interface Symbol {
+        flags: SymbolFlags;
+        escapedName: __String;
+        declarations: Declaration[];
+        valueDeclaration: Declaration;
+        members?: SymbolTable;
+        exports?: SymbolTable;
+        globalExports?: SymbolTable;
+        id?: number;
+        mergeId?: number;
+        parent?: Symbol;
+        exportSymbol?: Symbol;
+        nameType?: Type;
+        constEnumOnlyModule?: boolean;
+        isReferenced?: SymbolFlags;
+        isReplaceableByMethod?: boolean;
+        isAssigned?: boolean;
+    }
+    interface SymbolLinks {
+        immediateTarget?: Symbol;
+        target?: Symbol;
+        type?: Type;
+        uniqueESSymbolType?: Type;
+        declaredType?: Type;
+        typeParameters?: TypeParameter[];
+        outerTypeParameters?: TypeParameter[];
+        inferredClassType?: Type;
+        instantiations?: Map<Type>;
+        mapper?: TypeMapper;
+        referenced?: boolean;
+        containingType?: UnionOrIntersectionType;
+        leftSpread?: Symbol;
+        rightSpread?: Symbol;
+        syntheticOrigin?: Symbol;
+        isDiscriminantProperty?: boolean;
+        resolvedExports?: SymbolTable;
+        resolvedMembers?: SymbolTable;
+        exportsChecked?: boolean;
+        typeParametersChecked?: boolean;
+        isDeclarationWithCollidingName?: boolean;
+        bindingElement?: BindingElement;
+        exportsSomeValue?: boolean;
+        enumKind?: EnumKind;
+        originatingImport?: ImportDeclaration | ImportCall;
+        lateSymbol?: Symbol;
+    }
+    enum EnumKind {
+        Numeric = 0,
+        Literal = 1
+    }
+    enum CheckFlags {
+        Instantiated = 1,
+        SyntheticProperty = 2,
+        SyntheticMethod = 4,
+        Readonly = 8,
+        Partial = 16,
+        HasNonUniformType = 32,
+        ContainsPublic = 64,
+        ContainsProtected = 128,
+        ContainsPrivate = 256,
+        ContainsStatic = 512,
+        Late = 1024,
+        ReverseMapped = 2048,
+        Synthetic = 6
+    }
+    interface TransientSymbol extends Symbol, SymbolLinks {
+        checkFlags: CheckFlags;
+        isRestParameter?: boolean;
+    }
+    interface ReverseMappedSymbol extends TransientSymbol {
+        propertyType: Type;
+        mappedType: MappedType;
+    }
+    enum InternalSymbolName {
+        Call = "__call",
+        Constructor = "__constructor",
+        New = "__new",
+        Index = "__index",
+        ExportStar = "__export",
+        Global = "__global",
+        Missing = "__missing",
+        Type = "__type",
+        Object = "__object",
+        JSXAttributes = "__jsxAttributes",
+        Class = "__class",
+        Function = "__function",
+        Computed = "__computed",
+        Resolving = "__resolving__",
+        ExportEquals = "export=",
+        Default = "default"
+    }
+    /**
+     * This represents a string whose leading underscore have been escaped by adding extra leading underscores.
+     * The shape of this brand is rather unique compared to others we've used.
+     * Instead of just an intersection of a string and an object, it is that union-ed
+     * with an intersection of void and an object. This makes it wholly incompatible
+     * with a normal string (which is good, it cannot be misused on assignment or on usage),
+     * while still being comparable with a normal string via === (also good) and castable from a string.
+     */
+    type __String = (string & {
+        __escapedIdentifier: void;
+    }) | (void & {
+        __escapedIdentifier: void;
+    }) | InternalSymbolName;
+    /** ReadonlyMap where keys are `__String`s. */
+    interface ReadonlyUnderscoreEscapedMap<T> {
+        get(key: __String): T | undefined;
+        has(key: __String): boolean;
+        forEach(action: (value: T, key: __String) => void): void;
+        readonly size: number;
+        keys(): Iterator<__String>;
+        values(): Iterator<T>;
+        entries(): Iterator<[__String, T]>;
+    }
+    /** Map where keys are `__String`s. */
+    interface UnderscoreEscapedMap<T> extends ReadonlyUnderscoreEscapedMap<T> {
+        set(key: __String, value: T): this;
+        delete(key: __String): boolean;
+        clear(): void;
+    }
+    /** SymbolTable based on ES6 Map interface. */
+    type SymbolTable = UnderscoreEscapedMap<Symbol>;
+    /** Used to track a `declare module "foo*"`-like declaration. */
+    interface PatternAmbientModule {
+        pattern: Pattern;
+        symbol: Symbol;
+    }
+    enum NodeCheckFlags {
+        TypeChecked = 1,
+        LexicalThis = 2,
+        CaptureThis = 4,
+        CaptureNewTarget = 8,
+        SuperInstance = 256,
+        SuperStatic = 512,
+        ContextChecked = 1024,
+        AsyncMethodWithSuper = 2048,
+        AsyncMethodWithSuperBinding = 4096,
+        CaptureArguments = 8192,
+        EnumValuesComputed = 16384,
+        LexicalModuleMergesWithClass = 32768,
+        LoopWithCapturedBlockScopedBinding = 65536,
+        CapturedBlockScopedBinding = 131072,
+        BlockScopedBindingInLoop = 262144,
+        ClassWithBodyScopedClassBinding = 524288,
+        BodyScopedClassBinding = 1048576,
+        NeedsLoopOutParameter = 2097152,
+        AssignmentsMarked = 4194304,
+        ClassWithConstructorReference = 8388608,
+        ConstructorReferenceInClass = 16777216
+    }
+    interface NodeLinks {
+        flags: NodeCheckFlags;
+        resolvedType?: Type;
+        resolvedSignature?: Signature;
+        resolvedSignatures?: Map<Signature[]>;
+        resolvedSymbol?: Symbol;
+        resolvedIndexInfo?: IndexInfo;
+        maybeTypePredicate?: boolean;
+        enumMemberValue?: string | number;
+        isVisible?: boolean;
+        containsArgumentsReference?: boolean;
+        hasReportedStatementInAmbientContext?: boolean;
+        jsxFlags: JsxFlags;
+        resolvedJsxElementAttributesType?: Type;
+        resolvedJsxElementAllAttributesType?: Type;
+        hasSuperCall?: boolean;
+        superCall?: SuperCall;
+        switchTypes?: Type[];
+    }
+    enum TypeFlags {
+        Any = 1,
+        Unknown = 2,
+        String = 4,
+        Number = 8,
+        Boolean = 16,
+        Enum = 32,
+        StringLiteral = 64,
+        NumberLiteral = 128,
+        BooleanLiteral = 256,
+        EnumLiteral = 512,
+        ESSymbol = 1024,
+        UniqueESSymbol = 2048,
+        Void = 4096,
+        Undefined = 8192,
+        Null = 16384,
+        Never = 32768,
+        TypeParameter = 65536,
+        Object = 131072,
+        Union = 262144,
+        Intersection = 524288,
+        Index = 1048576,
+        IndexedAccess = 2097152,
+        Conditional = 4194304,
+        Substitution = 8388608,
+        NonPrimitive = 16777216,
+        FreshLiteral = 33554432,
+        UnionOfUnitTypes = 67108864,
+        ContainsWideningType = 134217728,
+        ContainsObjectLiteral = 268435456,
+        ContainsAnyFunctionType = 536870912,
+        AnyOrUnknown = 3,
+        Nullable = 24576,
+        Literal = 448,
+        Unit = 27072,
+        StringOrNumberLiteral = 192,
+        StringOrNumberLiteralOrUnique = 2240,
+        DefinitelyFalsy = 29120,
+        PossiblyFalsy = 29148,
+        Intrinsic = 16839967,
+        Primitive = 32764,
+        StringLike = 68,
+        NumberLike = 168,
+        BooleanLike = 272,
+        EnumLike = 544,
+        ESSymbolLike = 3072,
+        VoidLike = 12288,
+        DisjointDomains = 16809468,
+        UnionOrIntersection = 786432,
+        StructuredType = 917504,
+        TypeVariable = 2162688,
+        InstantiableNonPrimitive = 14745600,
+        InstantiablePrimitive = 1048576,
+        Instantiable = 15794176,
+        StructuredOrInstantiable = 16711680,
+        Narrowable = 33492479,
+        NotUnionOrUnit = 16909315,
+        NotUnit = 16749629,
+        RequiresWidening = 402653184,
+        PropagatingFlags = 939524096,
+        NonWideningType = 134217728,
+        Wildcard = 268435456,
+        EmptyObject = 536870912,
+        ConstructionFlags = 939524096,
+        GenericMappedType = 134217728
+    }
+    type DestructuringPattern = BindingPattern | ObjectLiteralExpression | ArrayLiteralExpression;
+    interface Type {
+        flags: TypeFlags;
+        id: number;
+        checker: TypeChecker;
+        symbol: Symbol;
+        pattern?: DestructuringPattern;
+        aliasSymbol?: Symbol;
+        aliasTypeArguments?: Type[];
+        wildcardInstantiation?: Type;
+    }
+    interface IntrinsicType extends Type {
+        intrinsicName: string;
+    }
+    interface LiteralType extends Type {
+        value: string | number;
+        freshType: LiteralType;
+        regularType: LiteralType;
+    }
+    interface UniqueESSymbolType extends Type {
+        symbol: Symbol;
+    }
+    interface StringLiteralType extends LiteralType {
+        value: string;
+    }
+    interface NumberLiteralType extends LiteralType {
+        value: number;
+    }
+    interface EnumType extends Type {
+    }
+    enum ObjectFlags {
+        Class = 1,
+        Interface = 2,
+        Reference = 4,
+        Tuple = 8,
+        Anonymous = 16,
+        Mapped = 32,
+        Instantiated = 64,
+        ObjectLiteral = 128,
+        EvolvingArray = 256,
+        ObjectLiteralPatternWithComputedProperties = 512,
+        ContainsSpread = 1024,
+        ReverseMapped = 2048,
+        JsxAttributes = 4096,
+        MarkerType = 8192,
+        ClassOrInterface = 3
+    }
+    interface ObjectType extends Type {
+        objectFlags: ObjectFlags;
+    }
+    /** Class and interface types (ObjectFlags.Class and ObjectFlags.Interface). */
+    interface InterfaceType extends ObjectType {
+        typeParameters: TypeParameter[] | undefined;
+        outerTypeParameters: TypeParameter[] | undefined;
+        localTypeParameters: TypeParameter[] | undefined;
+        thisType: TypeParameter | undefined;
+        resolvedBaseConstructorType?: Type;
+        resolvedBaseTypes: BaseType[];
+    }
+    type BaseType = ObjectType | IntersectionType;
+    interface InterfaceTypeWithDeclaredMembers extends InterfaceType {
+        declaredProperties: Symbol[];
+        declaredCallSignatures: Signature[];
+        declaredConstructSignatures: Signature[];
+        declaredStringIndexInfo?: IndexInfo;
+        declaredNumberIndexInfo?: IndexInfo;
+    }
+    /**
+     * Type references (ObjectFlags.Reference). When a class or interface has type parameters or
+     * a "this" type, references to the class or interface are made using type references. The
+     * typeArguments property specifies the types to substitute for the type parameters of the
+     * class or interface and optionally includes an extra element that specifies the type to
+     * substitute for "this" in the resulting instantiation. When no extra argument is present,
+     * the type reference itself is substituted for "this". The typeArguments property is undefined
+     * if the class or interface has no type parameters and the reference isn't specifying an
+     * explicit "this" argument.
+     */
+    interface TypeReference extends ObjectType {
+        target: GenericType;
+        typeArguments?: Type[];
+    }
+    enum Variance {
+        Invariant = 0,
+        Covariant = 1,
+        Contravariant = 2,
+        Bivariant = 3,
+        Independent = 4
+    }
+    interface GenericType extends InterfaceType, TypeReference {
+        instantiations: Map<TypeReference>;
+        variances?: Variance[];
+    }
+    interface UnionOrIntersectionType extends Type {
+        types: Type[];
+        propertyCache: SymbolTable;
+        resolvedProperties: Symbol[];
+        resolvedIndexType: IndexType;
+        resolvedStringIndexType: IndexType;
+        resolvedBaseConstraint: Type;
+        couldContainTypeVariables: boolean;
+    }
+    interface UnionType extends UnionOrIntersectionType {
+    }
+    interface IntersectionType extends UnionOrIntersectionType {
+        resolvedApparentType: Type;
+    }
+    type StructuredType = ObjectType | UnionType | IntersectionType;
+    interface AnonymousType extends ObjectType {
+        target?: AnonymousType;
+        mapper?: TypeMapper;
+    }
+    interface MappedType extends AnonymousType {
+        declaration: MappedTypeNode;
+        typeParameter?: TypeParameter;
+        constraintType?: Type;
+        templateType?: Type;
+        modifiersType?: Type;
+    }
+    interface EvolvingArrayType extends ObjectType {
+        elementType: Type;
+        finalArrayType?: Type;
+    }
+    interface ReverseMappedType extends ObjectType {
+        source: Type;
+        mappedType: MappedType;
+    }
+    interface ResolvedType extends ObjectType, UnionOrIntersectionType {
+        members: SymbolTable;
+        properties: Symbol[];
+        callSignatures: Signature[];
+        constructSignatures: Signature[];
+        stringIndexInfo?: IndexInfo;
+        numberIndexInfo?: IndexInfo;
+    }
+    interface FreshObjectLiteralType extends ResolvedType {
+        regularType: ResolvedType;
+    }
+    interface IterableOrIteratorType extends ObjectType, UnionType {
+        iteratedTypeOfIterable?: Type;
+        iteratedTypeOfIterator?: Type;
+        iteratedTypeOfAsyncIterable?: Type;
+        iteratedTypeOfAsyncIterator?: Type;
+    }
+    interface PromiseOrAwaitableType extends ObjectType, UnionType {
+        promiseTypeOfPromiseConstructor?: Type;
+        promisedTypeOfPromise?: Type;
+        awaitedTypeOfType?: Type;
+    }
+    interface SyntheticDefaultModuleType extends Type {
+        syntheticType?: Type;
+    }
+    interface InstantiableType extends Type {
+        resolvedBaseConstraint?: Type;
+        resolvedIndexType?: IndexType;
+        resolvedStringIndexType?: IndexType;
+    }
+    interface TypeParameter extends InstantiableType {
+        /** Retrieve using getConstraintFromTypeParameter */
+        constraint?: Type;
+        default?: Type;
+        target?: TypeParameter;
+        mapper?: TypeMapper;
+        isThisType?: boolean;
+        resolvedDefaultType?: Type;
+    }
+    interface IndexedAccessType extends InstantiableType {
+        objectType: Type;
+        indexType: Type;
+        constraint?: Type;
+        simplified?: Type;
+    }
+    type TypeVariable = TypeParameter | IndexedAccessType;
+    interface IndexType extends InstantiableType {
+        type: InstantiableType | UnionOrIntersectionType;
+        stringsOnly: boolean;
+    }
+    interface ConditionalRoot {
+        node: ConditionalTypeNode;
+        checkType: Type;
+        extendsType: Type;
+        trueType: Type;
+        falseType: Type;
+        isDistributive: boolean;
+        inferTypeParameters?: TypeParameter[];
+        outerTypeParameters?: TypeParameter[];
+        instantiations?: Map<Type>;
+        aliasSymbol?: Symbol;
+        aliasTypeArguments?: Type[];
+    }
+    interface ConditionalType extends InstantiableType {
+        root: ConditionalRoot;
+        checkType: Type;
+        extendsType: Type;
+        resolvedTrueType?: Type;
+        resolvedFalseType?: Type;
+        resolvedDefaultConstraint?: Type;
+        mapper?: TypeMapper;
+        combinedMapper?: TypeMapper;
+    }
+    interface SubstitutionType extends InstantiableType {
+        typeVariable: TypeVariable;
+        substitute: Type;
+    }
+    enum SignatureKind {
+        Call = 0,
+        Construct = 1
+    }
+    interface Signature {
+        declaration?: SignatureDeclaration | JSDocSignature;
+        typeParameters?: TypeParameter[];
+        parameters: Symbol[];
+        thisParameter?: Symbol;
+        resolvedReturnType?: Type;
+        resolvedTypePredicate?: TypePredicate;
+        minArgumentCount: number;
+        hasRestParameter: boolean;
+        hasLiteralTypes: boolean;
+        target?: Signature;
+        mapper?: TypeMapper;
+        unionSignatures?: Signature[];
+        erasedSignatureCache?: Signature;
+        canonicalSignatureCache?: Signature;
+        isolatedSignatureType?: ObjectType;
+        instantiations?: Map<Signature>;
+    }
+    enum IndexKind {
+        String = 0,
+        Number = 1
+    }
+    interface IndexInfo {
+        type: Type;
+        isReadonly: boolean;
+        declaration?: IndexSignatureDeclaration;
+    }
+    type TypeMapper = (t: TypeParameter) => Type;
+    enum InferencePriority {
+        NakedTypeVariable = 1,
+        HomomorphicMappedType = 2,
+        MappedTypeConstraint = 4,
+        ReturnType = 8,
+        LiteralKeyof = 16,
+        NoConstraints = 32,
+        AlwaysStrict = 64,
+        PriorityImpliesCombination = 28
+    }
+    interface InferenceInfo {
+        typeParameter: TypeParameter;
+        candidates: Type[] | undefined;
+        contraCandidates: Type[] | undefined;
+        inferredType?: Type;
+        priority?: InferencePriority;
+        topLevel: boolean;
+        isFixed: boolean;
+    }
+    enum InferenceFlags {
+        None = 0,
+        InferUnionTypes = 1,
+        NoDefault = 2,
+        AnyDefault = 4
+    }
+    /**
+     * Ternary values are defined such that
+     * x & y is False if either x or y is False.
+     * x & y is Maybe if either x or y is Maybe, but neither x or y is False.
+     * x & y is True if both x and y are True.
+     * x | y is False if both x and y are False.
+     * x | y is Maybe if either x or y is Maybe, but neither x or y is True.
+     * x | y is True if either x or y is True.
+     */
+    enum Ternary {
+        False = 0,
+        Maybe = 1,
+        True = -1
+    }
+    type TypeComparer = (s: Type, t: Type, reportErrors?: boolean) => Ternary;
+    interface InferenceContext extends TypeMapper {
+        typeParameters: TypeParameter[];
+        signature?: Signature;
+        inferences: InferenceInfo[];
+        flags: InferenceFlags;
+        compareTypes: TypeComparer;
+    }
+    interface WideningContext {
+        parent?: WideningContext;
+        propertyName?: __String;
+        siblings?: Type[];
+        resolvedProperties?: Symbol[];
+    }
+    enum SpecialPropertyAssignmentKind {
+        None = 0,
+        ExportsProperty = 1,
+        ModuleExports = 2,
+        PrototypeProperty = 3,
+        ThisProperty = 4,
+        Property = 5,
+        Prototype = 6
+    }
+    /** @deprecated Use FileExtensionInfo instead. */
+    type JsFileExtensionInfo = FileExtensionInfo;
+    interface FileExtensionInfo {
+        extension: string;
+        isMixedContent: boolean;
+        scriptKind?: ScriptKind;
+    }
+    interface DiagnosticMessage {
+        key: string;
+        category: DiagnosticCategory;
+        code: number;
+        message: string;
+        reportsUnnecessary?: {};
+    }
+    /**
+     * A linked list of formatted diagnostic messages to be used as part of a multiline message.
+     * It is built from the bottom up, leaving the head to be the "main" diagnostic.
+     * While it seems that DiagnosticMessageChain is structurally similar to DiagnosticMessage,
+     * the difference is that messages are all preformatted in DMC.
+     */
+    interface DiagnosticMessageChain {
+        messageText: string;
+        category: DiagnosticCategory;
+        code: number;
+        next?: DiagnosticMessageChain;
+    }
+    interface Diagnostic {
+        file: SourceFile | undefined;
+        start: number | undefined;
+        length: number | undefined;
+        messageText: string | DiagnosticMessageChain;
+        category: DiagnosticCategory;
+        /** May store more in future. For now, this will simply be `true` to indicate when a diagnostic is an unused-identifier diagnostic. */
+        reportsUnnecessary?: {};
+        code: number;
+        source?: string;
+    }
+    interface DiagnosticWithLocation extends Diagnostic {
+        file: SourceFile;
+        start: number;
+        length: number;
+    }
+    enum DiagnosticCategory {
+        Warning = 0,
+        Error = 1,
+        Suggestion = 2,
+        Message = 3
+    }
+    function diagnosticCategoryName(d: {
+        category: DiagnosticCategory;
+    }, lowerCase?: boolean): string;
+    enum ModuleResolutionKind {
+        Classic = 1,
+        NodeJs = 2
+    }
+    interface PluginImport {
+        name: string;
+    }
+    interface ProjectReference {
+        /** A normalized path on disk */
+        path: string;
+        /** The path as the user originally wrote it */
+        originalPath?: string;
+        /** True if the output of this reference should be prepended to the output of this project. Only valid for --outFile compilations */
+        prepend?: boolean;
+        /** True if it is intended that this reference form a circularity */
+        circular?: boolean;
+    }
+    type CompilerOptionsValue = string | number | boolean | (string | number)[] | string[] | MapLike<string[]> | PluginImport[] | ProjectReference[] | null | undefined;
+    interface CompilerOptions {
+        all?: boolean;
+        allowJs?: boolean;
+        allowNonTsExtensions?: boolean;
+        allowSyntheticDefaultImports?: boolean;
+        allowUnreachableCode?: boolean;
+        allowUnusedLabels?: boolean;
+        alwaysStrict?: boolean;
+        baseUrl?: string;
+        /** An error if set - this should only go through the -b pipeline and not actually be observed */
+        build?: boolean;
+        charset?: string;
+        checkJs?: boolean;
+        configFilePath?: string;
+        /** configFile is set as non enumerable property so as to avoid checking of json source files */
+        readonly configFile?: TsConfigSourceFile;
+        declaration?: boolean;
+        declarationMap?: boolean;
+        emitDeclarationOnly?: boolean;
+        declarationDir?: string;
+        diagnostics?: boolean;
+        extendedDiagnostics?: boolean;
+        disableSizeLimit?: boolean;
+        downlevelIteration?: boolean;
+        emitBOM?: boolean;
+        emitDecoratorMetadata?: boolean;
+        experimentalDecorators?: boolean;
+        forceConsistentCasingInFileNames?: boolean;
+        help?: boolean;
+        importHelpers?: boolean;
+        init?: boolean;
+        inlineSourceMap?: boolean;
+        inlineSources?: boolean;
+        isolatedModules?: boolean;
+        jsx?: JsxEmit;
+        keyofStringsOnly?: boolean;
+        lib?: string[];
+        listEmittedFiles?: boolean;
+        listFiles?: boolean;
+        locale?: string;
+        mapRoot?: string;
+        maxNodeModuleJsDepth?: number;
+        module?: ModuleKind;
+        moduleResolution?: ModuleResolutionKind;
+        newLine?: NewLineKind;
+        noEmit?: boolean;
+        noEmitForJsFiles?: boolean;
+        noEmitHelpers?: boolean;
+        noEmitOnError?: boolean;
+        noErrorTruncation?: boolean;
+        noFallthroughCasesInSwitch?: boolean;
+        noImplicitAny?: boolean;
+        noImplicitReturns?: boolean;
+        noImplicitThis?: boolean;
+        noStrictGenericChecks?: boolean;
+        noUnusedLocals?: boolean;
+        noUnusedParameters?: boolean;
+        noImplicitUseStrict?: boolean;
+        noLib?: boolean;
+        noResolve?: boolean;
+        out?: string;
+        outDir?: string;
+        outFile?: string;
+        paths?: MapLike<string[]>;
+        plugins?: PluginImport[];
+        preserveConstEnums?: boolean;
+        preserveSymlinks?: boolean;
+        preserveWatchOutput?: boolean;
+        project?: string;
+        pretty?: boolean;
+        reactNamespace?: string;
+        jsxFactory?: string;
+        composite?: boolean;
+        removeComments?: boolean;
+        rootDir?: string;
+        rootDirs?: string[];
+        skipLibCheck?: boolean;
+        skipDefaultLibCheck?: boolean;
+        sourceMap?: boolean;
+        sourceRoot?: string;
+        strict?: boolean;
+        strictFunctionTypes?: boolean;
+        strictNullChecks?: boolean;
+        strictPropertyInitialization?: boolean;
+        stripInternal?: boolean;
+        suppressExcessPropertyErrors?: boolean;
+        suppressImplicitAnyIndexErrors?: boolean;
+        suppressOutputPathCheck?: boolean;
+        target?: ScriptTarget;
+        traceResolution?: boolean;
+        resolveJsonModule?: boolean;
+        types?: string[];
+        /** Paths used to compute primary types search locations */
+        typeRoots?: string[];
+        version?: boolean;
+        watch?: boolean;
+        esModuleInterop?: boolean;
+        [option: string]: CompilerOptionsValue | TsConfigSourceFile | undefined;
+    }
+    interface TypeAcquisition {
+        enableAutoDiscovery?: boolean;
+        enable?: boolean;
+        include?: string[];
+        exclude?: string[];
+        [option: string]: string[] | boolean | undefined;
+    }
+    enum ModuleKind {
+        None = 0,
+        CommonJS = 1,
+        AMD = 2,
+        UMD = 3,
+        System = 4,
+        ES2015 = 5,
+        ESNext = 6
+    }
+    enum JsxEmit {
+        None = 0,
+        Preserve = 1,
+        React = 2,
+        ReactNative = 3
+    }
+    enum NewLineKind {
+        CarriageReturnLineFeed = 0,
+        LineFeed = 1
+    }
+    interface LineAndCharacter {
+        /** 0-based. */
+        line: number;
+        character: number;
+    }
+    enum ScriptKind {
+        Unknown = 0,
+        JS = 1,
+        JSX = 2,
+        TS = 3,
+        TSX = 4,
+        External = 5,
+        JSON = 6,
+        /**
+         * Used on extensions that doesn't define the ScriptKind but the content defines it.
+         * Deferred extensions are going to be included in all project contexts.
+         */
+        Deferred = 7
+    }
+    enum ScriptTarget {
+        ES3 = 0,
+        ES5 = 1,
+        ES2015 = 2,
+        ES2016 = 3,
+        ES2017 = 4,
+        ES2018 = 5,
+        ESNext = 6,
+        JSON = 100,
+        Latest = 6
+    }
+    enum LanguageVariant {
+        Standard = 0,
+        JSX = 1
+    }
+    /** Either a parsed command line or a parsed tsconfig.json */
+    interface ParsedCommandLine {
+        options: CompilerOptions;
+        typeAcquisition?: TypeAcquisition;
+        fileNames: string[];
+        projectReferences?: ReadonlyArray<ProjectReference>;
+        raw?: any;
+        errors: Diagnostic[];
+        wildcardDirectories?: MapLike<WatchDirectoryFlags>;
+        compileOnSave?: boolean;
+        configFileSpecs?: ConfigFileSpecs;
+    }
+    enum WatchDirectoryFlags {
+        None = 0,
+        Recursive = 1
+    }
+    interface ConfigFileSpecs {
+        filesSpecs: ReadonlyArray<string> | undefined;
+        referencesSpecs: ReadonlyArray<ProjectReference> | undefined;
+        /**
+         * Present to report errors (user specified specs), validatedIncludeSpecs are used for file name matching
+         */
+        includeSpecs?: ReadonlyArray<string>;
+        /**
+         * Present to report errors (user specified specs), validatedExcludeSpecs are used for file name matching
+         */
+        excludeSpecs?: ReadonlyArray<string>;
+        validatedIncludeSpecs?: ReadonlyArray<string>;
+        validatedExcludeSpecs?: ReadonlyArray<string>;
+        wildcardDirectories: MapLike<WatchDirectoryFlags>;
+    }
+    interface ExpandResult {
+        fileNames: string[];
+        projectReferences: ReadonlyArray<ProjectReference> | undefined;
+        wildcardDirectories: MapLike<WatchDirectoryFlags>;
+        spec: ConfigFileSpecs;
+    }
+    interface CreateProgramOptions {
+        rootNames: ReadonlyArray<string>;
+        options: CompilerOptions;
+        projectReferences?: ReadonlyArray<ProjectReference>;
+        host?: CompilerHost;
+        oldProgram?: Program;
+        configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>;
+    }
+    interface CommandLineOptionBase {
+        name: string;
+        type: "string" | "number" | "boolean" | "object" | "list" | Map<number | string>;
+        isFilePath?: boolean;
+        shortName?: string;
+        description?: DiagnosticMessage;
+        paramType?: DiagnosticMessage;
+        isTSConfigOnly?: boolean;
+        isCommandLineOnly?: boolean;
+        showInSimplifiedHelpView?: boolean;
+        category?: DiagnosticMessage;
+    }
+    interface CommandLineOptionOfPrimitiveType extends CommandLineOptionBase {
+        type: "string" | "number" | "boolean";
+    }
+    interface CommandLineOptionOfCustomType extends CommandLineOptionBase {
+        type: Map<number | string>;
+    }
+    interface TsConfigOnlyOption extends CommandLineOptionBase {
+        type: "object";
+        elementOptions?: Map<CommandLineOption>;
+        extraKeyDiagnosticMessage?: DiagnosticMessage;
+    }
+    interface CommandLineOptionOfListType extends CommandLineOptionBase {
+        type: "list";
+        element: CommandLineOptionOfCustomType | CommandLineOptionOfPrimitiveType | TsConfigOnlyOption;
+    }
+    type CommandLineOption = CommandLineOptionOfCustomType | CommandLineOptionOfPrimitiveType | TsConfigOnlyOption | CommandLineOptionOfListType;
+    enum CharacterCodes {
+        nullCharacter = 0,
+        maxAsciiCharacter = 127,
+        lineFeed = 10,
+        carriageReturn = 13,
+        lineSeparator = 8232,
+        paragraphSeparator = 8233,
+        nextLine = 133,
+        space = 32,
+        nonBreakingSpace = 160,
+        enQuad = 8192,
+        emQuad = 8193,
+        enSpace = 8194,
+        emSpace = 8195,
+        threePerEmSpace = 8196,
+        fourPerEmSpace = 8197,
+        sixPerEmSpace = 8198,
+        figureSpace = 8199,
+        punctuationSpace = 8200,
+        thinSpace = 8201,
+        hairSpace = 8202,
+        zeroWidthSpace = 8203,
+        narrowNoBreakSpace = 8239,
+        ideographicSpace = 12288,
+        mathematicalSpace = 8287,
+        ogham = 5760,
+        _ = 95,
+        $ = 36,
+        _0 = 48,
+        _1 = 49,
+        _2 = 50,
+        _3 = 51,
+        _4 = 52,
+        _5 = 53,
+        _6 = 54,
+        _7 = 55,
+        _8 = 56,
+        _9 = 57,
+        a = 97,
+        b = 98,
+        c = 99,
+        d = 100,
+        e = 101,
+        f = 102,
+        g = 103,
+        h = 104,
+        i = 105,
+        j = 106,
+        k = 107,
+        l = 108,
+        m = 109,
+        n = 110,
+        o = 111,
+        p = 112,
+        q = 113,
+        r = 114,
+        s = 115,
+        t = 116,
+        u = 117,
+        v = 118,
+        w = 119,
+        x = 120,
+        y = 121,
+        z = 122,
+        A = 65,
+        B = 66,
+        C = 67,
+        D = 68,
+        E = 69,
+        F = 70,
+        G = 71,
+        H = 72,
+        I = 73,
+        J = 74,
+        K = 75,
+        L = 76,
+        M = 77,
+        N = 78,
+        O = 79,
+        P = 80,
+        Q = 81,
+        R = 82,
+        S = 83,
+        T = 84,
+        U = 85,
+        V = 86,
+        W = 87,
+        X = 88,
+        Y = 89,
+        Z = 90,
+        ampersand = 38,
+        asterisk = 42,
+        at = 64,
+        backslash = 92,
+        backtick = 96,
+        bar = 124,
+        caret = 94,
+        closeBrace = 125,
+        closeBracket = 93,
+        closeParen = 41,
+        colon = 58,
+        comma = 44,
+        dot = 46,
+        doubleQuote = 34,
+        equals = 61,
+        exclamation = 33,
+        greaterThan = 62,
+        hash = 35,
+        lessThan = 60,
+        minus = 45,
+        openBrace = 123,
+        openBracket = 91,
+        openParen = 40,
+        percent = 37,
+        plus = 43,
+        question = 63,
+        semicolon = 59,
+        singleQuote = 39,
+        slash = 47,
+        tilde = 126,
+        backspace = 8,
+        formFeed = 12,
+        byteOrderMark = 65279,
+        tab = 9,
+        verticalTab = 11
+    }
+    interface ModuleResolutionHost {
+        fileExists(fileName: string): boolean;
+        readFile(fileName: string): string | undefined;
+        trace?(s: string): void;
+        directoryExists?(directoryName: string): boolean;
+        /**
+         * Resolve a symbolic link.
+         * @see https://nodejs.org/api/fs.html#fs_fs_realpathsync_path_options
+         */
+        realpath?(path: string): string;
+        getCurrentDirectory?(): string;
+        getDirectories?(path: string): string[];
+    }
+    /**
+     * Represents the result of module resolution.
+     * Module resolution will pick up tsx/jsx/js files even if '--jsx' and '--allowJs' are turned off.
+     * The Program will then filter results based on these flags.
+     *
+     * Prefer to return a `ResolvedModuleFull` so that the file type does not have to be inferred.
+     */
+    interface ResolvedModule {
+        /** Path of the file the module was resolved to. */
+        resolvedFileName: string;
+        /** True if `resolvedFileName` comes from `node_modules`. */
+        isExternalLibraryImport?: boolean;
+    }
+    /**
+     * ResolvedModule with an explicitly provided `extension` property.
+     * Prefer this over `ResolvedModule`.
+     * If changing this, remember to change `moduleResolutionIsEqualTo`.
+     */
+    interface ResolvedModuleFull extends ResolvedModule {
+        readonly originalPath?: string;
+        /**
+         * Extension of resolvedFileName. This must match what's at the end of resolvedFileName.
+         * This is optional for backwards-compatibility, but will be added if not provided.
+         */
+        extension: Extension;
+        packageId?: PackageId;
+    }
+    /**
+     * Unique identifier with a package name and version.
+     * If changing this, remember to change `packageIdIsEqual`.
+     */
+    interface PackageId {
+        /**
+         * Name of the package.
+         * Should not include `@types`.
+         * If accessing a non-index file, this should include its name e.g. "foo/bar".
+         */
+        name: string;
+        /**
+         * Name of a submodule within this package.
+         * May be "".
+         */
+        subModuleName: string;
+        /** Version of the package, e.g. "1.2.3" */
+        version: string;
+    }
+    enum Extension {
+        Ts = ".ts",
+        Tsx = ".tsx",
+        Dts = ".d.ts",
+        Js = ".js",
+        Jsx = ".jsx",
+        Json = ".json"
+    }
+    interface ResolvedModuleWithFailedLookupLocations {
+        readonly resolvedModule: ResolvedModuleFull | undefined;
+        readonly failedLookupLocations: ReadonlyArray<string>;
+    }
+    interface ResolvedTypeReferenceDirective {
+        primary: boolean;
+        resolvedFileName: string | undefined;
+        packageId?: PackageId;
+    }
+    interface ResolvedTypeReferenceDirectiveWithFailedLookupLocations {
+        readonly resolvedTypeReferenceDirective: ResolvedTypeReferenceDirective | undefined;
+        readonly failedLookupLocations: ReadonlyArray<string>;
+    }
+    type HasInvalidatedResolution = (sourceFile: Path) => boolean;
+    interface CompilerHost extends ModuleResolutionHost {
+        getSourceFile(fileName: string, languageVersion: ScriptTarget, onError?: (message: string) => void, shouldCreateNewSourceFile?: boolean): SourceFile | undefined;
+        getSourceFileByPath?(fileName: string, path: Path, languageVersion: ScriptTarget, onError?: (message: string) => void, shouldCreateNewSourceFile?: boolean): SourceFile | undefined;
+        getCancellationToken?(): CancellationToken;
+        getDefaultLibFileName(options: CompilerOptions): string;
+        getDefaultLibLocation?(): string;
+        writeFile: WriteFileCallback;
+        getCurrentDirectory(): string;
+        getDirectories(path: string): string[];
+        getCanonicalFileName(fileName: string): string;
+        useCaseSensitiveFileNames(): boolean;
+        getNewLine(): string;
+        readDirectory?(rootDir: string, extensions: ReadonlyArray<string>, excludes: ReadonlyArray<string> | undefined, includes: ReadonlyArray<string>, depth?: number): string[];
+        resolveModuleNames?(moduleNames: string[], containingFile: string, reusedNames?: string[]): (ResolvedModule | undefined)[];
+        /**
+         * This method is a companion for 'resolveModuleNames' and is used to resolve 'types' references to actual type declaration files
+         */
+        resolveTypeReferenceDirectives?(typeReferenceDirectiveNames: string[], containingFile: string): ResolvedTypeReferenceDirective[];
+        getEnvironmentVariable?(name: string): string | undefined;
+        onReleaseOldSourceFile?(oldSourceFile: SourceFile, oldOptions: CompilerOptions): void;
+        hasInvalidatedResolution?: HasInvalidatedResolution;
+        hasChangedAutomaticTypeDirectiveNames?: boolean;
+        createHash?(data: string): string;
+        getModifiedTime?(fileName: string): Date;
+        setModifiedTime?(fileName: string, date: Date): void;
+        deleteFile?(fileName: string): void;
+    }
+    enum TransformFlags {
+        None = 0,
+        TypeScript = 1,
+        ContainsTypeScript = 2,
+        ContainsJsx = 4,
+        ContainsESNext = 8,
+        ContainsES2017 = 16,
+        ContainsES2016 = 32,
+        ES2015 = 64,
+        ContainsES2015 = 128,
+        Generator = 256,
+        ContainsGenerator = 512,
+        DestructuringAssignment = 1024,
+        ContainsDestructuringAssignment = 2048,
+        ContainsDecorators = 4096,
+        ContainsPropertyInitializer = 8192,
+        ContainsLexicalThis = 16384,
+        ContainsCapturedLexicalThis = 32768,
+        ContainsLexicalThisInComputedPropertyName = 65536,
+        ContainsDefaultValueAssignments = 131072,
+        ContainsParameterPropertyAssignments = 262144,
+        ContainsSpread = 524288,
+        ContainsObjectSpread = 1048576,
+        ContainsRest = 524288,
+        ContainsObjectRest = 1048576,
+        ContainsComputedPropertyName = 2097152,
+        ContainsBlockScopedBinding = 4194304,
+        ContainsBindingPattern = 8388608,
+        ContainsYield = 16777216,
+        ContainsHoistedDeclarationOrCompletion = 33554432,
+        ContainsDynamicImport = 67108864,
+        Super = 134217728,
+        ContainsSuper = 268435456,
+        HasComputedFlags = 536870912,
+        AssertTypeScript = 3,
+        AssertJsx = 4,
+        AssertESNext = 8,
+        AssertES2017 = 16,
+        AssertES2016 = 32,
+        AssertES2015 = 192,
+        AssertGenerator = 768,
+        AssertDestructuringAssignment = 3072,
+        OuterExpressionExcludes = 536872257,
+        PropertyAccessExcludes = 671089985,
+        NodeExcludes = 939525441,
+        ArrowFunctionExcludes = 1003902273,
+        FunctionExcludes = 1003935041,
+        ConstructorExcludes = 1003668801,
+        MethodOrAccessorExcludes = 1003668801,
+        ClassExcludes = 942011713,
+        ModuleExcludes = 977327425,
+        TypeExcludes = -3,
+        ObjectLiteralExcludes = 942740801,
+        ArrayLiteralOrCallOrNewExcludes = 940049729,
+        VariableDeclarationListExcludes = 948962625,
+        ParameterExcludes = 939525441,
+        CatchClauseExcludes = 940574017,
+        BindingPatternExcludes = 940049729,
+        TypeScriptClassSyntaxMask = 274432,
+        ES2015FunctionSyntaxMask = 163840
+    }
+    interface SourceMapRange extends TextRange {
+        source?: SourceMapSource;
+    }
+    interface SourceMapSource {
+        fileName: string;
+        text: string;
+        lineMap: ReadonlyArray<number>;
+        skipTrivia?: (pos: number) => number;
+    }
+    interface EmitNode {
+        annotatedNodes?: Node[];
+        flags: EmitFlags;
+        leadingComments?: SynthesizedComment[];
+        trailingComments?: SynthesizedComment[];
+        commentRange?: TextRange;
+        sourceMapRange?: SourceMapRange;
+        tokenSourceMapRanges?: (SourceMapRange | undefined)[];
+        constantValue?: string | number;
+        externalHelpersModuleName?: Identifier;
+        helpers?: EmitHelper[];
+        startsOnNewLine?: boolean;
+    }
+    enum EmitFlags {
+        None = 0,
+        SingleLine = 1,
+        AdviseOnEmitNode = 2,
+        NoSubstitution = 4,
+        CapturesThis = 8,
+        NoLeadingSourceMap = 16,
+        NoTrailingSourceMap = 32,
+        NoSourceMap = 48,
+        NoNestedSourceMaps = 64,
+        NoTokenLeadingSourceMaps = 128,
+        NoTokenTrailingSourceMaps = 256,
+        NoTokenSourceMaps = 384,
+        NoLeadingComments = 512,
+        NoTrailingComments = 1024,
+        NoComments = 1536,
+        NoNestedComments = 2048,
+        HelperName = 4096,
+        ExportName = 8192,
+        LocalName = 16384,
+        InternalName = 32768,
+        Indented = 65536,
+        NoIndentation = 131072,
+        AsyncFunctionBody = 262144,
+        ReuseTempVariableScope = 524288,
+        CustomPrologue = 1048576,
+        NoHoisting = 2097152,
+        HasEndOfDeclarationMarker = 4194304,
+        Iterator = 8388608,
+        NoAsciiEscaping = 16777216,
+        TypeScriptClassWrapper = 33554432,
+        NeverApplyImportHelper = 67108864
+    }
+    interface EmitHelper {
+        readonly name: string;
+        readonly scoped: boolean;
+        readonly text: string | ((node: EmitHelperUniqueNameCallback) => string);
+        readonly priority?: number;
+    }
+    type UniqueNameHandler = (baseName: string, checkFn?: (name: string) => boolean, optimistic?: boolean) => string;
+    type EmitHelperUniqueNameCallback = (name: string) => string;
+    /**
+     * Used by the checker, this enum keeps track of external emit helpers that should be type
+     * checked.
+     */
+    enum ExternalEmitHelpers {
+        Extends = 1,
+        Assign = 2,
+        Rest = 4,
+        Decorate = 8,
+        Metadata = 16,
+        Param = 32,
+        Awaiter = 64,
+        Generator = 128,
+        Values = 256,
+        Read = 512,
+        Spread = 1024,
+        Await = 2048,
+        AsyncGenerator = 4096,
+        AsyncDelegator = 8192,
+        AsyncValues = 16384,
+        ExportStar = 32768,
+        MakeTemplateObject = 65536,
+        FirstEmitHelper = 1,
+        LastEmitHelper = 65536,
+        ForOfIncludes = 256,
+        ForAwaitOfIncludes = 16384,
+        AsyncGeneratorIncludes = 6144,
+        AsyncDelegatorIncludes = 26624,
+        SpreadIncludes = 1536
+    }
+    enum EmitHint {
+        SourceFile = 0,
+        Expression = 1,
+        IdentifierName = 2,
+        MappedTypeParameter = 3,
+        Unspecified = 4
+    }
+    interface EmitHost extends ScriptReferenceHost, ModuleSpecifierResolutionHost {
+        getSourceFiles(): ReadonlyArray<SourceFile>;
+        getCurrentDirectory(): string;
+        isSourceFileFromExternalLibrary(file: SourceFile): boolean;
+        getCommonSourceDirectory(): string;
+        getCanonicalFileName(fileName: string): string;
+        getNewLine(): string;
+        isEmitBlocked(emitFileName: string): boolean;
+        getPrependNodes(): ReadonlyArray<InputFiles>;
+        writeFile: WriteFileCallback;
+    }
+    interface TransformationContext {
+        getEmitResolver(): EmitResolver;
+        getEmitHost(): EmitHost;
+        /** Gets the compiler options supplied to the transformer. */
+        getCompilerOptions(): CompilerOptions;
+        /** Starts a new lexical environment. */
+        startLexicalEnvironment(): void;
+        /** Suspends the current lexical environment, usually after visiting a parameter list. */
+        suspendLexicalEnvironment(): void;
+        /** Resumes a suspended lexical environment, usually before visiting a function body. */
+        resumeLexicalEnvironment(): void;
+        /** Ends a lexical environment, returning any declarations. */
+        endLexicalEnvironment(): Statement[] | undefined;
+        /** Hoists a function declaration to the containing scope. */
+        hoistFunctionDeclaration(node: FunctionDeclaration): void;
+        /** Hoists a variable declaration to the containing scope. */
+        hoistVariableDeclaration(node: Identifier): void;
+        /** Records a request for a non-scoped emit helper in the current context. */
+        requestEmitHelper(helper: EmitHelper): void;
+        /** Gets and resets the requested non-scoped emit helpers. */
+        readEmitHelpers(): EmitHelper[] | undefined;
+        /** Enables expression substitutions in the pretty printer for the provided SyntaxKind. */
+        enableSubstitution(kind: SyntaxKind): void;
+        /** Determines whether expression substitutions are enabled for the provided node. */
+        isSubstitutionEnabled(node: Node): boolean;
+        /**
+         * Hook used by transformers to substitute expressions just before they
+         * are emitted by the pretty printer.
+         *
+         * NOTE: Transformation hooks should only be modified during `Transformer` initialization,
+         * before returning the `NodeTransformer` callback.
+         */
+        onSubstituteNode: (hint: EmitHint, node: Node) => Node;
+        /**
+         * Enables before/after emit notifications in the pretty printer for the provided
+         * SyntaxKind.
+         */
+        enableEmitNotification(kind: SyntaxKind): void;
+        /**
+         * Determines whether before/after emit notifications should be raised in the pretty
+         * printer when it emits a node.
+         */
+        isEmitNotificationEnabled(node: Node): boolean;
+        /**
+         * Hook used to allow transformers to capture state before or after
+         * the printer emits a node.
+         *
+         * NOTE: Transformation hooks should only be modified during `Transformer` initialization,
+         * before returning the `NodeTransformer` callback.
+         */
+        onEmitNode: (hint: EmitHint, node: Node, emitCallback: (hint: EmitHint, node: Node) => void) => void;
+        addDiagnostic(diag: DiagnosticWithLocation): void;
+    }
+    interface TransformationResult<T extends Node> {
+        /** Gets the transformed source files. */
+        transformed: T[];
+        /** Gets diagnostics for the transformation. */
+        diagnostics?: DiagnosticWithLocation[];
+        /**
+         * Gets a substitute for a node, if one is available; otherwise, returns the original node.
+         *
+         * @param hint A hint as to the intended usage of the node.
+         * @param node The node to substitute.
+         */
+        substituteNode(hint: EmitHint, node: Node): Node;
+        /**
+         * Emits a node with possible notification.
+         *
+         * @param hint A hint as to the intended usage of the node.
+         * @param node The node to emit.
+         * @param emitCallback A callback used to emit the node.
+         */
+        emitNodeWithNotification(hint: EmitHint, node: Node, emitCallback: (hint: EmitHint, node: Node) => void): void;
+        /**
+         * Clean up EmitNode entries on any parse-tree nodes.
+         */
+        dispose(): void;
+    }
+    /**
+     * A function that is used to initialize and return a `Transformer` callback, which in turn
+     * will be used to transform one or more nodes.
+     */
+    type TransformerFactory<T extends Node> = (context: TransformationContext) => Transformer<T>;
+    /**
+     * A function that transforms a node.
+     */
+    type Transformer<T extends Node> = (node: T) => T;
+    /**
+     * A function that accepts and possibly transforms a node.
+     */
+    type Visitor = (node: Node) => VisitResult<Node>;
+    type VisitResult<T extends Node> = T | T[] | undefined;
+    interface Printer {
+        /**
+         * Print a node and its subtree as-is, without any emit transformations.
+         * @param hint A value indicating the purpose of a node. This is primarily used to
+         * distinguish between an `Identifier` used in an expression position, versus an
+         * `Identifier` used as an `IdentifierName` as part of a declaration. For most nodes you
+         * should just pass `Unspecified`.
+         * @param node The node to print. The node and its subtree are printed as-is, without any
+         * emit transformations.
+         * @param sourceFile A source file that provides context for the node. The source text of
+         * the file is used to emit the original source content for literals and identifiers, while
+         * the identifiers of the source file are used when generating unique names to avoid
+         * collisions.
+         */
+        printNode(hint: EmitHint, node: Node, sourceFile: SourceFile): string;
+        /**
+         * Prints a list of nodes using the given format flags
+         */
+        printList<T extends Node>(format: ListFormat, list: NodeArray<T>, sourceFile: SourceFile): string;
+        /**
+         * Prints a source file as-is, without any emit transformations.
+         */
+        printFile(sourceFile: SourceFile): string;
+        /**
+         * Prints a bundle of source files as-is, without any emit transformations.
+         */
+        printBundle(bundle: Bundle): string;
+        writeNode(hint: EmitHint, node: Node, sourceFile: SourceFile | undefined, writer: EmitTextWriter): void;
+        writeList<T extends Node>(format: ListFormat, list: NodeArray<T> | undefined, sourceFile: SourceFile | undefined, writer: EmitTextWriter): void;
+        writeFile(sourceFile: SourceFile, writer: EmitTextWriter): void;
+        writeBundle(bundle: Bundle, writer: EmitTextWriter, info?: BundleInfo): void;
+    }
+    /**
+     * When a bundle contains prepended content, we store a file on disk indicating where the non-prepended
+     * content of that file starts. On a subsequent build where there are no upstream .d.ts changes, we
+     * read the bundle info file and the original .js file to quickly re-use portion of the file
+     * that didn't originate in prepended content.
+     */
+    interface BundleInfo {
+        originalOffset: number;
+        totalLength: number;
+    }
+    interface PrintHandlers {
+        /**
+         * A hook used by the Printer when generating unique names to avoid collisions with
+         * globally defined names that exist outside of the current source file.
+         */
+        hasGlobalName?(name: string): boolean;
+        /**
+         * A hook used by the Printer to provide notifications prior to emitting a node. A
+         * compatible implementation **must** invoke `emitCallback` with the provided `hint` and
+         * `node` values.
+         * @param hint A hint indicating the intended purpose of the node.
+         * @param node The node to emit.
+         * @param emitCallback A callback that, when invoked, will emit the node.
+         * @example
+         * ```ts
+         * var printer = createPrinter(printerOptions, {
+         *   onEmitNode(hint, node, emitCallback) {
+         *     // set up or track state prior to emitting the node...
+         *     emitCallback(hint, node);
+         *     // restore state after emitting the node...
+         *   }
+         * });
+         * ```
+         */
+        onEmitNode?(hint: EmitHint, node: Node | undefined, emitCallback: (hint: EmitHint, node: Node | undefined) => void): void;
+        /**
+         * A hook used by the Printer to perform just-in-time substitution of a node. This is
+         * primarily used by node transformations that need to substitute one node for another,
+         * such as replacing `myExportedVar` with `exports.myExportedVar`.
+         * @param hint A hint indicating the intended purpose of the node.
+         * @param node The node to emit.
+         * @example
+         * ```ts
+         * var printer = createPrinter(printerOptions, {
+         *   substituteNode(hint, node) {
+         *     // perform substitution if necessary...
+         *     return node;
+         *   }
+         * });
+         * ```
+         */
+        substituteNode?(hint: EmitHint, node: Node): Node;
+        onEmitSourceMapOfNode?: (hint: EmitHint, node: Node, emitCallback: (hint: EmitHint, node: Node) => void) => void;
+        onEmitSourceMapOfToken?: (node: Node | undefined, token: SyntaxKind, writer: (s: string) => void, pos: number, emitCallback: (token: SyntaxKind, writer: (s: string) => void, pos: number) => number) => number;
+        onEmitSourceMapOfPosition?: (pos: number) => void;
+        onSetSourceFile?: (node: SourceFile) => void;
+        onBeforeEmitNodeArray?: (nodes: NodeArray<any> | undefined) => void;
+        onAfterEmitNodeArray?: (nodes: NodeArray<any> | undefined) => void;
+        onBeforeEmitToken?: (node: Node) => void;
+        onAfterEmitToken?: (node: Node) => void;
+    }
+    interface PrinterOptions {
+        removeComments?: boolean;
+        newLine?: NewLineKind;
+        omitTrailingSemicolon?: boolean;
+        noEmitHelpers?: boolean;
+        module?: CompilerOptions["module"];
+        target?: CompilerOptions["target"];
+        sourceMap?: boolean;
+        inlineSourceMap?: boolean;
+        extendedDiagnostics?: boolean;
+        onlyPrintJsDocStyle?: boolean;
+    }
+    interface EmitTextWriter extends SymbolWriter {
+        write(s: string): void;
+        writeTextOfNode(text: string, node: Node): void;
+        getText(): string;
+        rawWrite(s: string): void;
+        writeLiteral(s: string): void;
+        getTextPos(): number;
+        getLine(): number;
+        getColumn(): number;
+        getIndent(): number;
+        isAtStartOfLine(): boolean;
+    }
+    interface GetEffectiveTypeRootsHost {
+        directoryExists?(directoryName: string): boolean;
+        getCurrentDirectory?(): string;
+    }
+    /** @internal */
+    interface ModuleSpecifierResolutionHost extends GetEffectiveTypeRootsHost {
+        useCaseSensitiveFileNames?(): boolean;
+        fileExists?(path: string): boolean;
+        readFile?(path: string): string | undefined;
+    }
+    /** @deprecated See comment on SymbolWriter */
+    interface SymbolTracker {
+        trackSymbol?(symbol: Symbol, enclosingDeclaration?: Node, meaning?: SymbolFlags): void;
+        reportInaccessibleThisError?(): void;
+        reportPrivateInBaseOfClassExpression?(propertyName: string): void;
+        reportInaccessibleUniqueSymbolError?(): void;
+        moduleResolverHost?: ModuleSpecifierResolutionHost;
+        trackReferencedAmbientModule?(decl: ModuleDeclaration): void;
+    }
+    interface TextSpan {
+        start: number;
+        length: number;
+    }
+    interface TextChangeRange {
+        span: TextSpan;
+        newLength: number;
+    }
+    interface DiagnosticCollection {
+        add(diagnostic: Diagnostic): void;
+        getGlobalDiagnostics(): Diagnostic[];
+        getDiagnostics(fileName: string): DiagnosticWithLocation[];
+        getDiagnostics(): Diagnostic[];
+        reattachFileDiagnostics(newFile: SourceFile): void;
+    }
+    interface SyntaxList extends Node {
+        _children: Node[];
+    }
+    enum ListFormat {
+        None = 0,
+        SingleLine = 0,
+        MultiLine = 1,
+        PreserveLines = 2,
+        LinesMask = 3,
+        NotDelimited = 0,
+        BarDelimited = 4,
+        AmpersandDelimited = 8,
+        CommaDelimited = 16,
+        DelimitersMask = 28,
+        AllowTrailingComma = 32,
+        Indented = 64,
+        SpaceBetweenBraces = 128,
+        SpaceBetweenSiblings = 256,
+        Braces = 512,
+        Parenthesis = 1024,
+        AngleBrackets = 2048,
+        SquareBrackets = 4096,
+        BracketsMask = 7680,
+        OptionalIfUndefined = 8192,
+        OptionalIfEmpty = 16384,
+        Optional = 24576,
+        PreferNewLine = 32768,
+        NoTrailingNewLine = 65536,
+        NoInterveningComments = 131072,
+        NoSpaceIfEmpty = 262144,
+        SingleElement = 524288,
+        Modifiers = 131328,
+        HeritageClauses = 256,
+        SingleLineTypeLiteralMembers = 384,
+        MultiLineTypeLiteralMembers = 16449,
+        TupleTypeElements = 272,
+        UnionTypeConstituents = 260,
+        IntersectionTypeConstituents = 264,
+        ObjectBindingPatternElements = 262576,
+        ArrayBindingPatternElements = 262448,
+        ObjectLiteralExpressionProperties = 263122,
+        ArrayLiteralExpressionElements = 4466,
+        CommaListElements = 272,
+        CallExpressionArguments = 1296,
+        NewExpressionArguments = 9488,
+        TemplateExpressionSpans = 131072,
+        SingleLineBlockStatements = 384,
+        MultiLineBlockStatements = 65,
+        VariableDeclarationList = 272,
+        SingleLineFunctionBodyStatements = 384,
+        MultiLineFunctionBodyStatements = 1,
+        ClassHeritageClauses = 0,
+        ClassMembers = 65,
+        InterfaceMembers = 65,
+        EnumMembers = 81,
+        CaseBlockClauses = 65,
+        NamedImportsOrExportsElements = 262576,
+        JsxElementOrFragmentChildren = 131072,
+        JsxElementAttributes = 131328,
+        CaseOrDefaultClauseStatements = 81985,
+        HeritageClauseTypes = 272,
+        SourceFileStatements = 65537,
+        Decorators = 24577,
+        TypeArguments = 26896,
+        TypeParameters = 26896,
+        Parameters = 1296,
+        IndexSignatureParameters = 4432
+    }
+    enum PragmaKindFlags {
+        None = 0,
+        /**
+         * Triple slash comment of the form
+         * /// <pragma-name argname="value" />
+         */
+        TripleSlashXML = 1,
+        /**
+         * Single line comment of the form
+         * // @pragma-name argval1 argval2
+         * or
+         * /// @pragma-name argval1 argval2
+         */
+        SingleLine = 2,
+        /**
+         * Multiline non-jsdoc pragma of the form
+         * /* @pragma-name argval1 argval2 * /
+         */
+        MultiLine = 4,
+        All = 7,
+        Default = 7
+    }
+    interface PragmaArgumentSpecification<TName extends string> {
+        name: TName;
+        optional?: boolean;
+        captureSpan?: boolean;
+    }
+    interface PragmaDefinition<T1 extends string = string, T2 extends string = string, T3 extends string = string, T4 extends string = string> {
+        args?: [PragmaArgumentSpecification<T1>] | [PragmaArgumentSpecification<T1>, PragmaArgumentSpecification<T2>] | [PragmaArgumentSpecification<T1>, PragmaArgumentSpecification<T2>, PragmaArgumentSpecification<T3>] | [PragmaArgumentSpecification<T1>, PragmaArgumentSpecification<T2>, PragmaArgumentSpecification<T3>, PragmaArgumentSpecification<T4>];
+        kind?: PragmaKindFlags;
+    }
+    const commentPragmas: {
+        "reference": {
+            args: [{
+                name: "types";
+                optional: true;
+                captureSpan: true;
+            }, {
+                name: "lib";
+                optional: true;
+                captureSpan: true;
+            }, {
+                name: "path";
+                optional: true;
+                captureSpan: true;
+            }, {
+                name: "no-default-lib";
+                optional: true;
+            }];
+            kind: PragmaKindFlags;
+        };
+        "amd-dependency": {
+            args: [{
+                name: "path";
+            }, {
+                name: "name";
+                optional: true;
+            }];
+            kind: PragmaKindFlags;
+        };
+        "amd-module": {
+            args: [{
+                name: "name";
+            }];
+            kind: PragmaKindFlags;
+        };
+        "ts-check": {
+            kind: PragmaKindFlags;
+        };
+        "ts-nocheck": {
+            kind: PragmaKindFlags;
+        };
+        "jsx": {
+            args: [{
+                name: "factory";
+            }];
+            kind: PragmaKindFlags;
+        };
+    };
+    type PragmaArgTypeMaybeCapture<TDesc> = TDesc extends {
+        captureSpan: true;
+    } ? {
+        value: string;
+        pos: number;
+        end: number;
+    } : string;
+    type PragmaArgTypeOptional<TDesc, TName extends string> = TDesc extends {
+        optional: true;
+    } ? {
+        [K in TName]?: PragmaArgTypeMaybeCapture<TDesc>;
+    } : {
+        [K in TName]: PragmaArgTypeMaybeCapture<TDesc>;
+    };
+    /**
+     * Maps a pragma definition into the desired shape for its arguments object
+     * Maybe the below is a good argument for types being iterable on struture in some way.
+     */
+    type PragmaArgumentType<T extends PragmaDefinition> = T extends {
+        args: [PragmaArgumentSpecification<infer TName1>, PragmaArgumentSpecification<infer TName2>, PragmaArgumentSpecification<infer TName3>, PragmaArgumentSpecification<infer TName4>];
+    } ? PragmaArgTypeOptional<T["args"][0], TName1> & PragmaArgTypeOptional<T["args"][1], TName2> & PragmaArgTypeOptional<T["args"][2], TName3> & PragmaArgTypeOptional<T["args"][2], TName4> : T extends {
+        args: [PragmaArgumentSpecification<infer TName1>, PragmaArgumentSpecification<infer TName2>, PragmaArgumentSpecification<infer TName3>];
+    } ? PragmaArgTypeOptional<T["args"][0], TName1> & PragmaArgTypeOptional<T["args"][1], TName2> & PragmaArgTypeOptional<T["args"][2], TName3> : T extends {
+        args: [PragmaArgumentSpecification<infer TName1>, PragmaArgumentSpecification<infer TName2>];
+    } ? PragmaArgTypeOptional<T["args"][0], TName1> & PragmaArgTypeOptional<T["args"][1], TName2> : T extends {
+        args: [PragmaArgumentSpecification<infer TName>];
+    } ? PragmaArgTypeOptional<T["args"][0], TName> : object;
+    type ConcretePragmaSpecs = typeof commentPragmas;
+    type PragmaPsuedoMap = {
+        [K in keyof ConcretePragmaSpecs]?: {
+            arguments: PragmaArgumentType<ConcretePragmaSpecs[K]>;
+            range: CommentRange;
+        };
+    };
+    type PragmaPsuedoMapEntry = {
+        [K in keyof PragmaPsuedoMap]: {
+            name: K;
+            args: PragmaPsuedoMap[K];
+        };
+    }[keyof PragmaPsuedoMap];
+    /**
+     * A strongly-typed es6 map of pragma entries, the values of which are either a single argument
+     * value (if only one was found), or an array of multiple argument values if the pragma is present
+     * in multiple places
+     */
+    interface PragmaMap extends Map<PragmaPsuedoMap[keyof PragmaPsuedoMap] | PragmaPsuedoMap[keyof PragmaPsuedoMap][]> {
+        set<TKey extends keyof PragmaPsuedoMap>(key: TKey, value: PragmaPsuedoMap[TKey] | PragmaPsuedoMap[TKey][]): this;
+        get<TKey extends keyof PragmaPsuedoMap>(key: TKey): PragmaPsuedoMap[TKey] | PragmaPsuedoMap[TKey][];
+        forEach(action: <TKey extends keyof PragmaPsuedoMap>(value: PragmaPsuedoMap[TKey] | PragmaPsuedoMap[TKey][], key: TKey) => void): void;
+    }
+}
+declare function setTimeout(handler: (...args: any[]) => void, timeout: number): any;
+declare function clearTimeout(handle: any): void;
+declare namespace ts {
+    /**
+     * Set a high stack trace limit to provide more information in case of an error.
+     * Called for command-line and server use cases.
+     * Not called if TypeScript is used as a library.
+     */
+    function setStackTraceLimit(): void;
+    enum FileWatcherEventKind {
+        Created = 0,
+        Changed = 1,
+        Deleted = 2
+    }
+    type FileWatcherCallback = (fileName: string, eventKind: FileWatcherEventKind) => void;
+    type DirectoryWatcherCallback = (fileName: string) => void;
+    interface WatchedFile {
+        readonly fileName: string;
+        readonly callback: FileWatcherCallback;
+        mtime: Date;
+    }
+    enum PollingInterval {
+        High = 2000,
+        Medium = 500,
+        Low = 250
+    }
+    function watchFileUsingPriorityPollingInterval(host: System, fileName: string, callback: FileWatcherCallback, watchPriority: PollingInterval): FileWatcher;
+    type HostWatchFile = (fileName: string, callback: FileWatcherCallback, pollingInterval: PollingInterval | undefined) => FileWatcher;
+    type HostWatchDirectory = (fileName: string, callback: DirectoryWatcherCallback, recursive?: boolean) => FileWatcher;
+    const missingFileModifiedTime: Date;
+    let unchangedPollThresholds: {
+        [PollingInterval.Low]: number;
+        [PollingInterval.Medium]: number;
+        [PollingInterval.High]: number;
+    };
+    function setCustomPollingValues(system: System): void;
+    function createDynamicPriorityPollingWatchFile(host: {
+        getModifiedTime: System["getModifiedTime"];
+        setTimeout: System["setTimeout"];
+    }): HostWatchFile;
+    /**
+     * Returns true if file status changed
+     */
+    function onWatchedFileStat(watchedFile: WatchedFile, modifiedTime: Date): boolean;
+    interface RecursiveDirectoryWatcherHost {
+        watchDirectory: HostWatchDirectory;
+        getAccessibleSortedChildDirectories(path: string): ReadonlyArray<string>;
+        directoryExists(dir: string): boolean;
+        filePathComparer: Comparer<string>;
+        realpath(s: string): string;
+    }
+    /**
+     * Watch the directory recursively using host provided method to watch child directories
+     * that means if this is recursive watcher, watch the children directories as well
+     * (eg on OS that dont support recursive watch using fs.watch use fs.watchFile)
+     */
+    function createRecursiveDirectoryWatcher(host: RecursiveDirectoryWatcherHost): (directoryName: string, callback: DirectoryWatcherCallback) => FileWatcher;
+    interface System {
+        args: string[];
+        newLine: string;
+        useCaseSensitiveFileNames: boolean;
+        write(s: string): void;
+        writeOutputIsTTY?(): boolean;
+        readFile(path: string, encoding?: string): string | undefined;
+        getFileSize?(path: string): number;
+        writeFile(path: string, data: string, writeByteOrderMark?: boolean): void;
+        /**
+         * @pollingInterval - this parameter is used in polling-based watchers and ignored in watchers that
+         * use native OS file watching
+         */
+        watchFile?(path: string, callback: FileWatcherCallback, pollingInterval?: number): FileWatcher;
+        watchDirectory?(path: string, callback: DirectoryWatcherCallback, recursive?: boolean): FileWatcher;
+        resolvePath(path: string): string;
+        fileExists(path: string): boolean;
+        directoryExists(path: string): boolean;
+        createDirectory(path: string): void;
+        getExecutingFilePath(): string;
+        getCurrentDirectory(): string;
+        getDirectories(path: string): string[];
+        readDirectory(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
+        getModifiedTime?(path: string): Date;
+        setModifiedTime?(path: string, time: Date): void;
+        deleteFile?(path: string): void;
+        /**
+         * A good implementation is node.js' `crypto.createHash`. (https://nodejs.org/api/crypto.html#crypto_crypto_createhash_algorithm)
+         */
+        createHash?(data: string): string;
+        /** This must be cryptographically secure. Only implement this method using `crypto.createHash("sha256")`. */
+        createSHA256Hash?(data: string): string;
+        getMemoryUsage?(): number;
+        exit(exitCode?: number): void;
+        realpath?(path: string): string;
+        getEnvironmentVariable(name: string): string;
+        tryEnableSourceMapsForHost?(): void;
+        debugMode?: boolean;
+        setTimeout?(callback: (...args: any[]) => void, ms: number, ...args: any[]): any;
+        clearTimeout?(timeoutId: any): void;
+        clearScreen?(): void;
+        setBlocking?(): void;
+        base64decode?(input: string): string;
+        base64encode?(input: string): string;
+    }
+    interface FileWatcher {
+        close(): void;
+    }
+    function getNodeMajorVersion(): number | undefined;
+    let sys: System;
+}
+declare namespace ts {
+    const Diagnostics: {
+        Unterminated_string_literal: DiagnosticMessage;
+        Identifier_expected: DiagnosticMessage;
+        _0_expected: DiagnosticMessage;
+        A_file_cannot_have_a_reference_to_itself: DiagnosticMessage;
+        Trailing_comma_not_allowed: DiagnosticMessage;
+        Asterisk_Slash_expected: DiagnosticMessage;
+        An_element_access_expression_should_take_an_argument: DiagnosticMessage;
+        Unexpected_token: DiagnosticMessage;
+        A_rest_parameter_or_binding_pattern_may_not_have_a_trailing_comma: DiagnosticMessage;
+        A_rest_parameter_must_be_last_in_a_parameter_list: DiagnosticMessage;
+        Parameter_cannot_have_question_mark_and_initializer: DiagnosticMessage;
+        A_required_parameter_cannot_follow_an_optional_parameter: DiagnosticMessage;
+        An_index_signature_cannot_have_a_rest_parameter: DiagnosticMessage;
+        An_index_signature_parameter_cannot_have_an_accessibility_modifier: DiagnosticMessage;
+        An_index_signature_parameter_cannot_have_a_question_mark: DiagnosticMessage;
+        An_index_signature_parameter_cannot_have_an_initializer: DiagnosticMessage;
+        An_index_signature_must_have_a_type_annotation: DiagnosticMessage;
+        An_index_signature_parameter_must_have_a_type_annotation: DiagnosticMessage;
+        An_index_signature_parameter_type_must_be_string_or_number: DiagnosticMessage;
+        readonly_modifier_can_only_appear_on_a_property_declaration_or_index_signature: DiagnosticMessage;
+        Accessibility_modifier_already_seen: DiagnosticMessage;
+        _0_modifier_must_precede_1_modifier: DiagnosticMessage;
+        _0_modifier_already_seen: DiagnosticMessage;
+        _0_modifier_cannot_appear_on_a_class_element: DiagnosticMessage;
+        super_must_be_followed_by_an_argument_list_or_member_access: DiagnosticMessage;
+        Only_ambient_modules_can_use_quoted_names: DiagnosticMessage;
+        Statements_are_not_allowed_in_ambient_contexts: DiagnosticMessage;
+        A_declare_modifier_cannot_be_used_in_an_already_ambient_context: DiagnosticMessage;
+        Initializers_are_not_allowed_in_ambient_contexts: DiagnosticMessage;
+        _0_modifier_cannot_be_used_in_an_ambient_context: DiagnosticMessage;
+        _0_modifier_cannot_be_used_with_a_class_declaration: DiagnosticMessage;
+        _0_modifier_cannot_be_used_here: DiagnosticMessage;
+        _0_modifier_cannot_appear_on_a_data_property: DiagnosticMessage;
+        _0_modifier_cannot_appear_on_a_module_or_namespace_element: DiagnosticMessage;
+        A_0_modifier_cannot_be_used_with_an_interface_declaration: DiagnosticMessage;
+        A_declare_modifier_is_required_for_a_top_level_declaration_in_a_d_ts_file: DiagnosticMessage;
+        A_rest_parameter_cannot_be_optional: DiagnosticMessage;
+        A_rest_parameter_cannot_have_an_initializer: DiagnosticMessage;
+        A_set_accessor_must_have_exactly_one_parameter: DiagnosticMessage;
+        A_set_accessor_cannot_have_an_optional_parameter: DiagnosticMessage;
+        A_set_accessor_parameter_cannot_have_an_initializer: DiagnosticMessage;
+        A_set_accessor_cannot_have_rest_parameter: DiagnosticMessage;
+        A_get_accessor_cannot_have_parameters: DiagnosticMessage;
+        Type_0_is_not_a_valid_async_function_return_type_in_ES5_SlashES3_because_it_does_not_refer_to_a_Promise_compatible_constructor_value: DiagnosticMessage;
+        Accessors_are_only_available_when_targeting_ECMAScript_5_and_higher: DiagnosticMessage;
+        An_async_function_or_method_must_have_a_valid_awaitable_return_type: DiagnosticMessage;
+        The_return_type_of_an_async_function_must_either_be_a_valid_promise_or_must_not_contain_a_callable_then_member: DiagnosticMessage;
+        A_promise_must_have_a_then_method: DiagnosticMessage;
+        The_first_parameter_of_the_then_method_of_a_promise_must_be_a_callback: DiagnosticMessage;
+        Enum_member_must_have_initializer: DiagnosticMessage;
+        Type_is_referenced_directly_or_indirectly_in_the_fulfillment_callback_of_its_own_then_method: DiagnosticMessage;
+        An_export_assignment_cannot_be_used_in_a_namespace: DiagnosticMessage;
+        The_return_type_of_an_async_function_or_method_must_be_the_global_Promise_T_type: DiagnosticMessage;
+        In_ambient_enum_declarations_member_initializer_must_be_constant_expression: DiagnosticMessage;
+        Unexpected_token_A_constructor_method_accessor_or_property_was_expected: DiagnosticMessage;
+        Unexpected_token_A_type_parameter_name_was_expected_without_curly_braces: DiagnosticMessage;
+        _0_modifier_cannot_appear_on_a_type_member: DiagnosticMessage;
+        _0_modifier_cannot_appear_on_an_index_signature: DiagnosticMessage;
+        A_0_modifier_cannot_be_used_with_an_import_declaration: DiagnosticMessage;
+        Invalid_reference_directive_syntax: DiagnosticMessage;
+        Octal_literals_are_not_available_when_targeting_ECMAScript_5_and_higher_Use_the_syntax_0: DiagnosticMessage;
+        An_accessor_cannot_be_declared_in_an_ambient_context: DiagnosticMessage;
+        _0_modifier_cannot_appear_on_a_constructor_declaration: DiagnosticMessage;
+        _0_modifier_cannot_appear_on_a_parameter: DiagnosticMessage;
+        Only_a_single_variable_declaration_is_allowed_in_a_for_in_statement: DiagnosticMessage;
+        Type_parameters_cannot_appear_on_a_constructor_declaration: DiagnosticMessage;
+        Type_annotation_cannot_appear_on_a_constructor_declaration: DiagnosticMessage;
+        An_accessor_cannot_have_type_parameters: DiagnosticMessage;
+        A_set_accessor_cannot_have_a_return_type_annotation: DiagnosticMessage;
+        An_index_signature_must_have_exactly_one_parameter: DiagnosticMessage;
+        _0_list_cannot_be_empty: DiagnosticMessage;
+        Type_parameter_list_cannot_be_empty: DiagnosticMessage;
+        Type_argument_list_cannot_be_empty: DiagnosticMessage;
+        Invalid_use_of_0_in_strict_mode: DiagnosticMessage;
+        with_statements_are_not_allowed_in_strict_mode: DiagnosticMessage;
+        delete_cannot_be_called_on_an_identifier_in_strict_mode: DiagnosticMessage;
+        A_for_await_of_statement_is_only_allowed_within_an_async_function_or_async_generator: DiagnosticMessage;
+        A_continue_statement_can_only_be_used_within_an_enclosing_iteration_statement: DiagnosticMessage;
+        A_break_statement_can_only_be_used_within_an_enclosing_iteration_or_switch_statement: DiagnosticMessage;
+        Jump_target_cannot_cross_function_boundary: DiagnosticMessage;
+        A_return_statement_can_only_be_used_within_a_function_body: DiagnosticMessage;
+        Expression_expected: DiagnosticMessage;
+        Type_expected: DiagnosticMessage;
+        A_default_clause_cannot_appear_more_than_once_in_a_switch_statement: DiagnosticMessage;
+        Duplicate_label_0: DiagnosticMessage;
+        A_continue_statement_can_only_jump_to_a_label_of_an_enclosing_iteration_statement: DiagnosticMessage;
+        A_break_statement_can_only_jump_to_a_label_of_an_enclosing_statement: DiagnosticMessage;
+        An_object_literal_cannot_have_multiple_properties_with_the_same_name_in_strict_mode: DiagnosticMessage;
+        An_object_literal_cannot_have_multiple_get_Slashset_accessors_with_the_same_name: DiagnosticMessage;
+        An_object_literal_cannot_have_property_and_accessor_with_the_same_name: DiagnosticMessage;
+        An_export_assignment_cannot_have_modifiers: DiagnosticMessage;
+        Octal_literals_are_not_allowed_in_strict_mode: DiagnosticMessage;
+        A_tuple_type_element_list_cannot_be_empty: DiagnosticMessage;
+        Variable_declaration_list_cannot_be_empty: DiagnosticMessage;
+        Digit_expected: DiagnosticMessage;
+        Hexadecimal_digit_expected: DiagnosticMessage;
+        Unexpected_end_of_text: DiagnosticMessage;
+        Invalid_character: DiagnosticMessage;
+        Declaration_or_statement_expected: DiagnosticMessage;
+        Statement_expected: DiagnosticMessage;
+        case_or_default_expected: DiagnosticMessage;
+        Property_or_signature_expected: DiagnosticMessage;
+        Enum_member_expected: DiagnosticMessage;
+        Variable_declaration_expected: DiagnosticMessage;
+        Argument_expression_expected: DiagnosticMessage;
+        Property_assignment_expected: DiagnosticMessage;
+        Expression_or_comma_expected: DiagnosticMessage;
+        Parameter_declaration_expected: DiagnosticMessage;
+        Type_parameter_declaration_expected: DiagnosticMessage;
+        Type_argument_expected: DiagnosticMessage;
+        String_literal_expected: DiagnosticMessage;
+        Line_break_not_permitted_here: DiagnosticMessage;
+        or_expected: DiagnosticMessage;
+        Declaration_expected: DiagnosticMessage;
+        Import_declarations_in_a_namespace_cannot_reference_a_module: DiagnosticMessage;
+        Cannot_use_imports_exports_or_module_augmentations_when_module_is_none: DiagnosticMessage;
+        File_name_0_differs_from_already_included_file_name_1_only_in_casing: DiagnosticMessage;
+        new_T_cannot_be_used_to_create_an_array_Use_new_Array_T_instead: DiagnosticMessage;
+        const_declarations_must_be_initialized: DiagnosticMessage;
+        const_declarations_can_only_be_declared_inside_a_block: DiagnosticMessage;
+        let_declarations_can_only_be_declared_inside_a_block: DiagnosticMessage;
+        Unterminated_template_literal: DiagnosticMessage;
+        Unterminated_regular_expression_literal: DiagnosticMessage;
+        An_object_member_cannot_be_declared_optional: DiagnosticMessage;
+        A_yield_expression_is_only_allowed_in_a_generator_body: DiagnosticMessage;
+        Computed_property_names_are_not_allowed_in_enums: DiagnosticMessage;
+        A_computed_property_name_in_an_ambient_context_must_refer_to_an_expression_whose_type_is_a_literal_type_or_a_unique_symbol_type: DiagnosticMessage;
+        A_computed_property_name_in_a_class_property_declaration_must_refer_to_an_expression_whose_type_is_a_literal_type_or_a_unique_symbol_type: DiagnosticMessage;
+        A_computed_property_name_in_a_method_overload_must_refer_to_an_expression_whose_type_is_a_literal_type_or_a_unique_symbol_type: DiagnosticMessage;
+        A_computed_property_name_in_an_interface_must_refer_to_an_expression_whose_type_is_a_literal_type_or_a_unique_symbol_type: DiagnosticMessage;
+        A_computed_property_name_in_a_type_literal_must_refer_to_an_expression_whose_type_is_a_literal_type_or_a_unique_symbol_type: DiagnosticMessage;
+        A_comma_expression_is_not_allowed_in_a_computed_property_name: DiagnosticMessage;
+        extends_clause_already_seen: DiagnosticMessage;
+        extends_clause_must_precede_implements_clause: DiagnosticMessage;
+        Classes_can_only_extend_a_single_class: DiagnosticMessage;
+        implements_clause_already_seen: DiagnosticMessage;
+        Interface_declaration_cannot_have_implements_clause: DiagnosticMessage;
+        Binary_digit_expected: DiagnosticMessage;
+        Octal_digit_expected: DiagnosticMessage;
+        Unexpected_token_expected: DiagnosticMessage;
+        Property_destructuring_pattern_expected: DiagnosticMessage;
+        Array_element_destructuring_pattern_expected: DiagnosticMessage;
+        A_destructuring_declaration_must_have_an_initializer: DiagnosticMessage;
+        An_implementation_cannot_be_declared_in_ambient_contexts: DiagnosticMessage;
+        Modifiers_cannot_appear_here: DiagnosticMessage;
+        Merge_conflict_marker_encountered: DiagnosticMessage;
+        A_rest_element_cannot_have_an_initializer: DiagnosticMessage;
+        A_parameter_property_may_not_be_declared_using_a_binding_pattern: DiagnosticMessage;
+        Only_a_single_variable_declaration_is_allowed_in_a_for_of_statement: DiagnosticMessage;
+        The_variable_declaration_of_a_for_in_statement_cannot_have_an_initializer: DiagnosticMessage;
+        The_variable_declaration_of_a_for_of_statement_cannot_have_an_initializer: DiagnosticMessage;
+        An_import_declaration_cannot_have_modifiers: DiagnosticMessage;
+        Module_0_has_no_default_export: DiagnosticMessage;
+        An_export_declaration_cannot_have_modifiers: DiagnosticMessage;
+        Export_declarations_are_not_permitted_in_a_namespace: DiagnosticMessage;
+        Catch_clause_variable_cannot_have_a_type_annotation: DiagnosticMessage;
+        Catch_clause_variable_cannot_have_an_initializer: DiagnosticMessage;
+        An_extended_Unicode_escape_value_must_be_between_0x0_and_0x10FFFF_inclusive: DiagnosticMessage;
+        Unterminated_Unicode_escape_sequence: DiagnosticMessage;
+        Line_terminator_not_permitted_before_arrow: DiagnosticMessage;
+        Import_assignment_cannot_be_used_when_targeting_ECMAScript_modules_Consider_using_import_Asterisk_as_ns_from_mod_import_a_from_mod_import_d_from_mod_or_another_module_format_instead: DiagnosticMessage;
+        Export_assignment_cannot_be_used_when_targeting_ECMAScript_modules_Consider_using_export_default_or_another_module_format_instead: DiagnosticMessage;
+        Cannot_re_export_a_type_when_the_isolatedModules_flag_is_provided: DiagnosticMessage;
+        Decorators_are_not_valid_here: DiagnosticMessage;
+        Decorators_cannot_be_applied_to_multiple_get_Slashset_accessors_of_the_same_name: DiagnosticMessage;
+        Cannot_compile_namespaces_when_the_isolatedModules_flag_is_provided: DiagnosticMessage;
+        Ambient_const_enums_are_not_allowed_when_the_isolatedModules_flag_is_provided: DiagnosticMessage;
+        Invalid_use_of_0_Class_definitions_are_automatically_in_strict_mode: DiagnosticMessage;
+        A_class_declaration_without_the_default_modifier_must_have_a_name: DiagnosticMessage;
+        Identifier_expected_0_is_a_reserved_word_in_strict_mode: DiagnosticMessage;
+        Identifier_expected_0_is_a_reserved_word_in_strict_mode_Class_definitions_are_automatically_in_strict_mode: DiagnosticMessage;
+        Identifier_expected_0_is_a_reserved_word_in_strict_mode_Modules_are_automatically_in_strict_mode: DiagnosticMessage;
+        Invalid_use_of_0_Modules_are_automatically_in_strict_mode: DiagnosticMessage;
+        Identifier_expected_esModule_is_reserved_as_an_exported_marker_when_transforming_ECMAScript_modules: DiagnosticMessage;
+        Export_assignment_is_not_supported_when_module_flag_is_system: DiagnosticMessage;
+        Experimental_support_for_decorators_is_a_feature_that_is_subject_to_change_in_a_future_release_Set_the_experimentalDecorators_option_to_remove_this_warning: DiagnosticMessage;
+        Generators_are_only_available_when_targeting_ECMAScript_2015_or_higher: DiagnosticMessage;
+        Generators_are_not_allowed_in_an_ambient_context: DiagnosticMessage;
+        An_overload_signature_cannot_be_declared_as_a_generator: DiagnosticMessage;
+        _0_tag_already_specified: DiagnosticMessage;
+        Signature_0_must_be_a_type_predicate: DiagnosticMessage;
+        Cannot_find_parameter_0: DiagnosticMessage;
+        Type_predicate_0_is_not_assignable_to_1: DiagnosticMessage;
+        Parameter_0_is_not_in_the_same_position_as_parameter_1: DiagnosticMessage;
+        A_type_predicate_is_only_allowed_in_return_type_position_for_functions_and_methods: DiagnosticMessage;
+        A_type_predicate_cannot_reference_a_rest_parameter: DiagnosticMessage;
+        A_type_predicate_cannot_reference_element_0_in_a_binding_pattern: DiagnosticMessage;
+        An_export_assignment_can_only_be_used_in_a_module: DiagnosticMessage;
+        An_import_declaration_can_only_be_used_in_a_namespace_or_module: DiagnosticMessage;
+        An_export_declaration_can_only_be_used_in_a_module: DiagnosticMessage;
+        An_ambient_module_declaration_is_only_allowed_at_the_top_level_in_a_file: DiagnosticMessage;
+        A_namespace_declaration_is_only_allowed_in_a_namespace_or_module: DiagnosticMessage;
+        The_return_type_of_a_property_decorator_function_must_be_either_void_or_any: DiagnosticMessage;
+        The_return_type_of_a_parameter_decorator_function_must_be_either_void_or_any: DiagnosticMessage;
+        Unable_to_resolve_signature_of_class_decorator_when_called_as_an_expression: DiagnosticMessage;
+        Unable_to_resolve_signature_of_parameter_decorator_when_called_as_an_expression: DiagnosticMessage;
+        Unable_to_resolve_signature_of_property_decorator_when_called_as_an_expression: DiagnosticMessage;
+        Unable_to_resolve_signature_of_method_decorator_when_called_as_an_expression: DiagnosticMessage;
+        abstract_modifier_can_only_appear_on_a_class_method_or_property_declaration: DiagnosticMessage;
+        _0_modifier_cannot_be_used_with_1_modifier: DiagnosticMessage;
+        Abstract_methods_can_only_appear_within_an_abstract_class: DiagnosticMessage;
+        Method_0_cannot_have_an_implementation_because_it_is_marked_abstract: DiagnosticMessage;
+        An_interface_property_cannot_have_an_initializer: DiagnosticMessage;
+        A_type_literal_property_cannot_have_an_initializer: DiagnosticMessage;
+        A_class_member_cannot_have_the_0_keyword: DiagnosticMessage;
+        A_decorator_can_only_decorate_a_method_implementation_not_an_overload: DiagnosticMessage;
+        Function_declarations_are_not_allowed_inside_blocks_in_strict_mode_when_targeting_ES3_or_ES5: DiagnosticMessage;
+        Function_declarations_are_not_allowed_inside_blocks_in_strict_mode_when_targeting_ES3_or_ES5_Class_definitions_are_automatically_in_strict_mode: DiagnosticMessage;
+        Function_declarations_are_not_allowed_inside_blocks_in_strict_mode_when_targeting_ES3_or_ES5_Modules_are_automatically_in_strict_mode: DiagnosticMessage;
+        _0_tag_cannot_be_used_independently_as_a_top_level_JSDoc_tag: DiagnosticMessage;
+        A_const_initializer_in_an_ambient_context_must_be_a_string_or_numeric_literal: DiagnosticMessage;
+        A_definite_assignment_assertion_is_not_permitted_in_this_context: DiagnosticMessage;
+        with_statements_are_not_allowed_in_an_async_function_block: DiagnosticMessage;
+        await_expression_is_only_allowed_within_an_async_function: DiagnosticMessage;
+        can_only_be_used_in_an_object_literal_property_inside_a_destructuring_assignment: DiagnosticMessage;
+        The_body_of_an_if_statement_cannot_be_the_empty_statement: DiagnosticMessage;
+        Global_module_exports_may_only_appear_in_module_files: DiagnosticMessage;
+        Global_module_exports_may_only_appear_in_declaration_files: DiagnosticMessage;
+        Global_module_exports_may_only_appear_at_top_level: DiagnosticMessage;
+        A_parameter_property_cannot_be_declared_using_a_rest_parameter: DiagnosticMessage;
+        An_abstract_accessor_cannot_have_an_implementation: DiagnosticMessage;
+        A_default_export_can_only_be_used_in_an_ECMAScript_style_module: DiagnosticMessage;
+        Type_of_await_operand_must_either_be_a_valid_promise_or_must_not_contain_a_callable_then_member: DiagnosticMessage;
+        Type_of_yield_operand_in_an_async_generator_must_either_be_a_valid_promise_or_must_not_contain_a_callable_then_member: DiagnosticMessage;
+        Type_of_iterated_elements_of_a_yield_Asterisk_operand_must_either_be_a_valid_promise_or_must_not_contain_a_callable_then_member: DiagnosticMessage;
+        Dynamic_import_is_only_supported_when_module_flag_is_commonjs_or_esNext: DiagnosticMessage;
+        Dynamic_import_must_have_one_specifier_as_an_argument: DiagnosticMessage;
+        Specifier_of_dynamic_import_cannot_be_spread_element: DiagnosticMessage;
+        Dynamic_import_cannot_have_type_arguments: DiagnosticMessage;
+        String_literal_with_double_quotes_expected: DiagnosticMessage;
+        Property_value_can_only_be_string_literal_numeric_literal_true_false_null_object_literal_or_array_literal: DiagnosticMessage;
+        _0_accepts_too_few_arguments_to_be_used_as_a_decorator_here_Did_you_mean_to_call_it_first_and_write_0: DiagnosticMessage;
+        A_property_of_an_interface_or_type_literal_whose_type_is_a_unique_symbol_type_must_be_readonly: DiagnosticMessage;
+        A_property_of_a_class_whose_type_is_a_unique_symbol_type_must_be_both_static_and_readonly: DiagnosticMessage;
+        A_variable_whose_type_is_a_unique_symbol_type_must_be_const: DiagnosticMessage;
+        unique_symbol_types_may_not_be_used_on_a_variable_declaration_with_a_binding_name: DiagnosticMessage;
+        unique_symbol_types_are_only_allowed_on_variables_in_a_variable_statement: DiagnosticMessage;
+        unique_symbol_types_are_not_allowed_here: DiagnosticMessage;
+        An_index_signature_parameter_type_cannot_be_a_type_alias_Consider_writing_0_Colon_1_Colon_2_instead: DiagnosticMessage;
+        An_index_signature_parameter_type_cannot_be_a_union_type_Consider_using_a_mapped_object_type_instead: DiagnosticMessage;
+        infer_declarations_are_only_permitted_in_the_extends_clause_of_a_conditional_type: DiagnosticMessage;
+        Module_0_does_not_refer_to_a_value_but_is_used_as_a_value_here: DiagnosticMessage;
+        Module_0_does_not_refer_to_a_type_but_is_used_as_a_type_here: DiagnosticMessage;
+        Type_arguments_cannot_be_used_here: DiagnosticMessage;
+        The_import_meta_meta_property_is_only_allowed_using_ESNext_for_the_target_and_module_compiler_options: DiagnosticMessage;
+        Duplicate_identifier_0: DiagnosticMessage;
+        Initializer_of_instance_member_variable_0_cannot_reference_identifier_1_declared_in_the_constructor: DiagnosticMessage;
+        Static_members_cannot_reference_class_type_parameters: DiagnosticMessage;
+        Circular_definition_of_import_alias_0: DiagnosticMessage;
+        Cannot_find_name_0: DiagnosticMessage;
+        Module_0_has_no_exported_member_1: DiagnosticMessage;
+        File_0_is_not_a_module: DiagnosticMessage;
+        Cannot_find_module_0: DiagnosticMessage;
+        Module_0_has_already_exported_a_member_named_1_Consider_explicitly_re_exporting_to_resolve_the_ambiguity: DiagnosticMessage;
+        An_export_assignment_cannot_be_used_in_a_module_with_other_exported_elements: DiagnosticMessage;
+        Type_0_recursively_references_itself_as_a_base_type: DiagnosticMessage;
+        A_class_may_only_extend_another_class: DiagnosticMessage;
+        An_interface_may_only_extend_a_class_or_another_interface: DiagnosticMessage;
+        Type_parameter_0_has_a_circular_constraint: DiagnosticMessage;
+        Generic_type_0_requires_1_type_argument_s: DiagnosticMessage;
+        Type_0_is_not_generic: DiagnosticMessage;
+        Global_type_0_must_be_a_class_or_interface_type: DiagnosticMessage;
+        Global_type_0_must_have_1_type_parameter_s: DiagnosticMessage;
+        Cannot_find_global_type_0: DiagnosticMessage;
+        Named_property_0_of_types_1_and_2_are_not_identical: DiagnosticMessage;
+        Interface_0_cannot_simultaneously_extend_types_1_and_2: DiagnosticMessage;
+        Excessive_stack_depth_comparing_types_0_and_1: DiagnosticMessage;
+        Type_0_is_not_assignable_to_type_1: DiagnosticMessage;
+        Cannot_redeclare_exported_variable_0: DiagnosticMessage;
+        Property_0_is_missing_in_type_1: DiagnosticMessage;
+        Property_0_is_private_in_type_1_but_not_in_type_2: DiagnosticMessage;
+        Types_of_property_0_are_incompatible: DiagnosticMessage;
+        Property_0_is_optional_in_type_1_but_required_in_type_2: DiagnosticMessage;
+        Types_of_parameters_0_and_1_are_incompatible: DiagnosticMessage;
+        Index_signature_is_missing_in_type_0: DiagnosticMessage;
+        Index_signatures_are_incompatible: DiagnosticMessage;
+        this_cannot_be_referenced_in_a_module_or_namespace_body: DiagnosticMessage;
+        this_cannot_be_referenced_in_current_location: DiagnosticMessage;
+        this_cannot_be_referenced_in_constructor_arguments: DiagnosticMessage;
+        this_cannot_be_referenced_in_a_static_property_initializer: DiagnosticMessage;
+        super_can_only_be_referenced_in_a_derived_class: DiagnosticMessage;
+        super_cannot_be_referenced_in_constructor_arguments: DiagnosticMessage;
+        Super_calls_are_not_permitted_outside_constructors_or_in_nested_functions_inside_constructors: DiagnosticMessage;
+        super_property_access_is_permitted_only_in_a_constructor_member_function_or_member_accessor_of_a_derived_class: DiagnosticMessage;
+        Property_0_does_not_exist_on_type_1: DiagnosticMessage;
+        Only_public_and_protected_methods_of_the_base_class_are_accessible_via_the_super_keyword: DiagnosticMessage;
+        Property_0_is_private_and_only_accessible_within_class_1: DiagnosticMessage;
+        An_index_expression_argument_must_be_of_type_string_number_symbol_or_any: DiagnosticMessage;
+        This_syntax_requires_an_imported_helper_named_1_but_module_0_has_no_exported_member_1: DiagnosticMessage;
+        Type_0_does_not_satisfy_the_constraint_1: DiagnosticMessage;
+        Argument_of_type_0_is_not_assignable_to_parameter_of_type_1: DiagnosticMessage;
+        Call_target_does_not_contain_any_signatures: DiagnosticMessage;
+        Untyped_function_calls_may_not_accept_type_arguments: DiagnosticMessage;
+        Value_of_type_0_is_not_callable_Did_you_mean_to_include_new: DiagnosticMessage;
+        Cannot_invoke_an_expression_whose_type_lacks_a_call_signature_Type_0_has_no_compatible_call_signatures: DiagnosticMessage;
+        Only_a_void_function_can_be_called_with_the_new_keyword: DiagnosticMessage;
+        Cannot_use_new_with_an_expression_whose_type_lacks_a_call_or_construct_signature: DiagnosticMessage;
+        Type_0_cannot_be_converted_to_type_1: DiagnosticMessage;
+        Object_literal_may_only_specify_known_properties_and_0_does_not_exist_in_type_1: DiagnosticMessage;
+        This_syntax_requires_an_imported_helper_but_module_0_cannot_be_found: DiagnosticMessage;
+        A_function_whose_declared_type_is_neither_void_nor_any_must_return_a_value: DiagnosticMessage;
+        An_arithmetic_operand_must_be_of_type_any_number_or_an_enum_type: DiagnosticMessage;
+        The_operand_of_an_increment_or_decrement_operator_must_be_a_variable_or_a_property_access: DiagnosticMessage;
+        The_left_hand_side_of_an_instanceof_expression_must_be_of_type_any_an_object_type_or_a_type_parameter: DiagnosticMessage;
+        The_right_hand_side_of_an_instanceof_expression_must_be_of_type_any_or_of_a_type_assignable_to_the_Function_interface_type: DiagnosticMessage;
+        The_left_hand_side_of_an_in_expression_must_be_of_type_any_string_number_or_symbol: DiagnosticMessage;
+        The_right_hand_side_of_an_in_expression_must_be_of_type_any_an_object_type_or_a_type_parameter: DiagnosticMessage;
+        The_left_hand_side_of_an_arithmetic_operation_must_be_of_type_any_number_or_an_enum_type: DiagnosticMessage;
+        The_right_hand_side_of_an_arithmetic_operation_must_be_of_type_any_number_or_an_enum_type: DiagnosticMessage;
+        The_left_hand_side_of_an_assignment_expression_must_be_a_variable_or_a_property_access: DiagnosticMessage;
+        Operator_0_cannot_be_applied_to_types_1_and_2: DiagnosticMessage;
+        Function_lacks_ending_return_statement_and_return_type_does_not_include_undefined: DiagnosticMessage;
+        Type_parameter_name_cannot_be_0: DiagnosticMessage;
+        A_parameter_property_is_only_allowed_in_a_constructor_implementation: DiagnosticMessage;
+        A_rest_parameter_must_be_of_an_array_type: DiagnosticMessage;
+        A_parameter_initializer_is_only_allowed_in_a_function_or_constructor_implementation: DiagnosticMessage;
+        Parameter_0_cannot_be_referenced_in_its_initializer: DiagnosticMessage;
+        Initializer_of_parameter_0_cannot_reference_identifier_1_declared_after_it: DiagnosticMessage;
+        Duplicate_string_index_signature: DiagnosticMessage;
+        Duplicate_number_index_signature: DiagnosticMessage;
+        A_super_call_must_be_the_first_statement_in_the_constructor_when_a_class_contains_initialized_properties_or_has_parameter_properties: DiagnosticMessage;
+        Constructors_for_derived_classes_must_contain_a_super_call: DiagnosticMessage;
+        A_get_accessor_must_return_a_value: DiagnosticMessage;
+        Getter_and_setter_accessors_do_not_agree_in_visibility: DiagnosticMessage;
+        get_and_set_accessor_must_have_the_same_type: DiagnosticMessage;
+        A_signature_with_an_implementation_cannot_use_a_string_literal_type: DiagnosticMessage;
+        Specialized_overload_signature_is_not_assignable_to_any_non_specialized_signature: DiagnosticMessage;
+        Overload_signatures_must_all_be_exported_or_non_exported: DiagnosticMessage;
+        Overload_signatures_must_all_be_ambient_or_non_ambient: DiagnosticMessage;
+        Overload_signatures_must_all_be_public_private_or_protected: DiagnosticMessage;
+        Overload_signatures_must_all_be_optional_or_required: DiagnosticMessage;
+        Function_overload_must_be_static: DiagnosticMessage;
+        Function_overload_must_not_be_static: DiagnosticMessage;
+        Function_implementation_name_must_be_0: DiagnosticMessage;
+        Constructor_implementation_is_missing: DiagnosticMessage;
+        Function_implementation_is_missing_or_not_immediately_following_the_declaration: DiagnosticMessage;
+        Multiple_constructor_implementations_are_not_allowed: DiagnosticMessage;
+        Duplicate_function_implementation: DiagnosticMessage;
+        Overload_signature_is_not_compatible_with_function_implementation: DiagnosticMessage;
+        Individual_declarations_in_merged_declaration_0_must_be_all_exported_or_all_local: DiagnosticMessage;
+        Duplicate_identifier_arguments_Compiler_uses_arguments_to_initialize_rest_parameters: DiagnosticMessage;
+        Declaration_name_conflicts_with_built_in_global_identifier_0: DiagnosticMessage;
+        Duplicate_identifier_this_Compiler_uses_variable_declaration_this_to_capture_this_reference: DiagnosticMessage;
+        Expression_resolves_to_variable_declaration_this_that_compiler_uses_to_capture_this_reference: DiagnosticMessage;
+        Duplicate_identifier_super_Compiler_uses_super_to_capture_base_class_reference: DiagnosticMessage;
+        Expression_resolves_to_super_that_compiler_uses_to_capture_base_class_reference: DiagnosticMessage;
+        Subsequent_variable_declarations_must_have_the_same_type_Variable_0_must_be_of_type_1_but_here_has_type_2: DiagnosticMessage;
+        The_left_hand_side_of_a_for_in_statement_cannot_use_a_type_annotation: DiagnosticMessage;
+        The_left_hand_side_of_a_for_in_statement_must_be_of_type_string_or_any: DiagnosticMessage;
+        The_left_hand_side_of_a_for_in_statement_must_be_a_variable_or_a_property_access: DiagnosticMessage;
+        The_right_hand_side_of_a_for_in_statement_must_be_of_type_any_an_object_type_or_a_type_parameter_but_here_has_type_0: DiagnosticMessage;
+        Setters_cannot_return_a_value: DiagnosticMessage;
+        Return_type_of_constructor_signature_must_be_assignable_to_the_instance_type_of_the_class: DiagnosticMessage;
+        The_with_statement_is_not_supported_All_symbols_in_a_with_block_will_have_type_any: DiagnosticMessage;
+        Property_0_of_type_1_is_not_assignable_to_string_index_type_2: DiagnosticMessage;
+        Property_0_of_type_1_is_not_assignable_to_numeric_index_type_2: DiagnosticMessage;
+        Numeric_index_type_0_is_not_assignable_to_string_index_type_1: DiagnosticMessage;
+        Class_name_cannot_be_0: DiagnosticMessage;
+        Class_0_incorrectly_extends_base_class_1: DiagnosticMessage;
+        Property_0_in_type_1_is_not_assignable_to_the_same_property_in_base_type_2: DiagnosticMessage;
+        Class_static_side_0_incorrectly_extends_base_class_static_side_1: DiagnosticMessage;
+        Class_0_incorrectly_implements_interface_1: DiagnosticMessage;
+        A_class_may_only_implement_another_class_or_interface: DiagnosticMessage;
+        Class_0_defines_instance_member_function_1_but_extended_class_2_defines_it_as_instance_member_accessor: DiagnosticMessage;
+        Class_0_defines_instance_member_function_1_but_extended_class_2_defines_it_as_instance_member_property: DiagnosticMessage;
+        Class_0_defines_instance_member_property_1_but_extended_class_2_defines_it_as_instance_member_function: DiagnosticMessage;
+        Class_0_defines_instance_member_accessor_1_but_extended_class_2_defines_it_as_instance_member_function: DiagnosticMessage;
+        Interface_name_cannot_be_0: DiagnosticMessage;
+        All_declarations_of_0_must_have_identical_type_parameters: DiagnosticMessage;
+        Interface_0_incorrectly_extends_interface_1: DiagnosticMessage;
+        Enum_name_cannot_be_0: DiagnosticMessage;
+        In_an_enum_with_multiple_declarations_only_one_declaration_can_omit_an_initializer_for_its_first_enum_element: DiagnosticMessage;
+        A_namespace_declaration_cannot_be_in_a_different_file_from_a_class_or_function_with_which_it_is_merged: DiagnosticMessage;
+        A_namespace_declaration_cannot_be_located_prior_to_a_class_or_function_with_which_it_is_merged: DiagnosticMessage;
+        Ambient_modules_cannot_be_nested_in_other_modules_or_namespaces: DiagnosticMessage;
+        Ambient_module_declaration_cannot_specify_relative_module_name: DiagnosticMessage;
+        Module_0_is_hidden_by_a_local_declaration_with_the_same_name: DiagnosticMessage;
+        Import_name_cannot_be_0: DiagnosticMessage;
+        Import_or_export_declaration_in_an_ambient_module_declaration_cannot_reference_module_through_relative_module_name: DiagnosticMessage;
+        Import_declaration_conflicts_with_local_declaration_of_0: DiagnosticMessage;
+        Duplicate_identifier_0_Compiler_reserves_name_1_in_top_level_scope_of_a_module: DiagnosticMessage;
+        Types_have_separate_declarations_of_a_private_property_0: DiagnosticMessage;
+        Property_0_is_protected_but_type_1_is_not_a_class_derived_from_2: DiagnosticMessage;
+        Property_0_is_protected_in_type_1_but_public_in_type_2: DiagnosticMessage;
+        Property_0_is_protected_and_only_accessible_within_class_1_and_its_subclasses: DiagnosticMessage;
+        Property_0_is_protected_and_only_accessible_through_an_instance_of_class_1: DiagnosticMessage;
+        The_0_operator_is_not_allowed_for_boolean_types_Consider_using_1_instead: DiagnosticMessage;
+        Block_scoped_variable_0_used_before_its_declaration: DiagnosticMessage;
+        Class_0_used_before_its_declaration: DiagnosticMessage;
+        Enum_0_used_before_its_declaration: DiagnosticMessage;
+        Cannot_redeclare_block_scoped_variable_0: DiagnosticMessage;
+        An_enum_member_cannot_have_a_numeric_name: DiagnosticMessage;
+        The_type_argument_for_type_parameter_0_cannot_be_inferred_from_the_usage_Consider_specifying_the_type_arguments_explicitly: DiagnosticMessage;
+        Variable_0_is_used_before_being_assigned: DiagnosticMessage;
+        Type_argument_candidate_1_is_not_a_valid_type_argument_because_it_is_not_a_supertype_of_candidate_0: DiagnosticMessage;
+        Type_alias_0_circularly_references_itself: DiagnosticMessage;
+        Type_alias_name_cannot_be_0: DiagnosticMessage;
+        An_AMD_module_cannot_have_multiple_name_assignments: DiagnosticMessage;
+        Type_0_has_no_property_1_and_no_string_index_signature: DiagnosticMessage;
+        Type_0_has_no_property_1: DiagnosticMessage;
+        Type_0_is_not_an_array_type: DiagnosticMessage;
+        A_rest_element_must_be_last_in_a_destructuring_pattern: DiagnosticMessage;
+        A_binding_pattern_parameter_cannot_be_optional_in_an_implementation_signature: DiagnosticMessage;
+        A_computed_property_name_must_be_of_type_string_number_symbol_or_any: DiagnosticMessage;
+        this_cannot_be_referenced_in_a_computed_property_name: DiagnosticMessage;
+        super_cannot_be_referenced_in_a_computed_property_name: DiagnosticMessage;
+        A_computed_property_name_cannot_reference_a_type_parameter_from_its_containing_type: DiagnosticMessage;
+        Cannot_find_global_value_0: DiagnosticMessage;
+        The_0_operator_cannot_be_applied_to_type_symbol: DiagnosticMessage;
+        Symbol_reference_does_not_refer_to_the_global_Symbol_constructor_object: DiagnosticMessage;
+        A_computed_property_name_of_the_form_0_must_be_of_type_symbol: DiagnosticMessage;
+        Spread_operator_in_new_expressions_is_only_available_when_targeting_ECMAScript_5_and_higher: DiagnosticMessage;
+        Enum_declarations_must_all_be_const_or_non_const: DiagnosticMessage;
+        In_const_enum_declarations_member_initializer_must_be_constant_expression: DiagnosticMessage;
+        const_enums_can_only_be_used_in_property_or_index_access_expressions_or_the_right_hand_side_of_an_import_declaration_or_export_assignment_or_type_query: DiagnosticMessage;
+        A_const_enum_member_can_only_be_accessed_using_a_string_literal: DiagnosticMessage;
+        const_enum_member_initializer_was_evaluated_to_a_non_finite_value: DiagnosticMessage;
+        const_enum_member_initializer_was_evaluated_to_disallowed_value_NaN: DiagnosticMessage;
+        Property_0_does_not_exist_on_const_enum_1: DiagnosticMessage;
+        let_is_not_allowed_to_be_used_as_a_name_in_let_or_const_declarations: DiagnosticMessage;
+        Cannot_initialize_outer_scoped_variable_0_in_the_same_scope_as_block_scoped_declaration_1: DiagnosticMessage;
+        The_left_hand_side_of_a_for_of_statement_cannot_use_a_type_annotation: DiagnosticMessage;
+        Export_declaration_conflicts_with_exported_declaration_of_0: DiagnosticMessage;
+        The_left_hand_side_of_a_for_of_statement_must_be_a_variable_or_a_property_access: DiagnosticMessage;
+        Type_0_must_have_a_Symbol_iterator_method_that_returns_an_iterator: DiagnosticMessage;
+        An_iterator_must_have_a_next_method: DiagnosticMessage;
+        The_type_returned_by_the_next_method_of_an_iterator_must_have_a_value_property: DiagnosticMessage;
+        The_left_hand_side_of_a_for_in_statement_cannot_be_a_destructuring_pattern: DiagnosticMessage;
+        Cannot_redeclare_identifier_0_in_catch_clause: DiagnosticMessage;
+        Tuple_type_0_with_length_1_cannot_be_assigned_to_tuple_with_length_2: DiagnosticMessage;
+        Using_a_string_in_a_for_of_statement_is_only_supported_in_ECMAScript_5_and_higher: DiagnosticMessage;
+        Type_0_is_not_an_array_type_or_a_string_type: DiagnosticMessage;
+        The_arguments_object_cannot_be_referenced_in_an_arrow_function_in_ES3_and_ES5_Consider_using_a_standard_function_expression: DiagnosticMessage;
+        Module_0_resolves_to_a_non_module_entity_and_cannot_be_imported_using_this_construct: DiagnosticMessage;
+        Module_0_uses_export_and_cannot_be_used_with_export_Asterisk: DiagnosticMessage;
+        An_interface_can_only_extend_an_identifier_Slashqualified_name_with_optional_type_arguments: DiagnosticMessage;
+        A_class_can_only_implement_an_identifier_Slashqualified_name_with_optional_type_arguments: DiagnosticMessage;
+        A_rest_element_cannot_contain_a_binding_pattern: DiagnosticMessage;
+        _0_is_referenced_directly_or_indirectly_in_its_own_type_annotation: DiagnosticMessage;
+        Cannot_find_namespace_0: DiagnosticMessage;
+        Type_0_must_have_a_Symbol_asyncIterator_method_that_returns_an_async_iterator: DiagnosticMessage;
+        A_generator_cannot_have_a_void_type_annotation: DiagnosticMessage;
+        _0_is_referenced_directly_or_indirectly_in_its_own_base_expression: DiagnosticMessage;
+        Type_0_is_not_a_constructor_function_type: DiagnosticMessage;
+        No_base_constructor_has_the_specified_number_of_type_arguments: DiagnosticMessage;
+        Base_constructor_return_type_0_is_not_a_class_or_interface_type: DiagnosticMessage;
+        Base_constructors_must_all_have_the_same_return_type: DiagnosticMessage;
+        Cannot_create_an_instance_of_an_abstract_class: DiagnosticMessage;
+        Overload_signatures_must_all_be_abstract_or_non_abstract: DiagnosticMessage;
+        Abstract_method_0_in_class_1_cannot_be_accessed_via_super_expression: DiagnosticMessage;
+        Classes_containing_abstract_methods_must_be_marked_abstract: DiagnosticMessage;
+        Non_abstract_class_0_does_not_implement_inherited_abstract_member_1_from_class_2: DiagnosticMessage;
+        All_declarations_of_an_abstract_method_must_be_consecutive: DiagnosticMessage;
+        Cannot_assign_an_abstract_constructor_type_to_a_non_abstract_constructor_type: DiagnosticMessage;
+        A_this_based_type_guard_is_not_compatible_with_a_parameter_based_type_guard: DiagnosticMessage;
+        An_async_iterator_must_have_a_next_method: DiagnosticMessage;
+        Duplicate_identifier_0_Compiler_uses_declaration_1_to_support_async_functions: DiagnosticMessage;
+        Expression_resolves_to_variable_declaration_0_that_compiler_uses_to_support_async_functions: DiagnosticMessage;
+        The_arguments_object_cannot_be_referenced_in_an_async_function_or_method_in_ES3_and_ES5_Consider_using_a_standard_function_or_method: DiagnosticMessage;
+        yield_expressions_cannot_be_used_in_a_parameter_initializer: DiagnosticMessage;
+        await_expressions_cannot_be_used_in_a_parameter_initializer: DiagnosticMessage;
+        Initializer_provides_no_value_for_this_binding_element_and_the_binding_element_has_no_default_value: DiagnosticMessage;
+        A_this_type_is_available_only_in_a_non_static_member_of_a_class_or_interface: DiagnosticMessage;
+        The_inferred_type_of_0_references_an_inaccessible_1_type_A_type_annotation_is_necessary: DiagnosticMessage;
+        A_module_cannot_have_multiple_default_exports: DiagnosticMessage;
+        Duplicate_identifier_0_Compiler_reserves_name_1_in_top_level_scope_of_a_module_containing_async_functions: DiagnosticMessage;
+        Property_0_is_incompatible_with_index_signature: DiagnosticMessage;
+        Object_is_possibly_null: DiagnosticMessage;
+        Object_is_possibly_undefined: DiagnosticMessage;
+        Object_is_possibly_null_or_undefined: DiagnosticMessage;
+        A_function_returning_never_cannot_have_a_reachable_end_point: DiagnosticMessage;
+        Enum_type_0_has_members_with_initializers_that_are_not_literals: DiagnosticMessage;
+        Type_0_cannot_be_used_to_index_type_1: DiagnosticMessage;
+        Type_0_has_no_matching_index_signature_for_type_1: DiagnosticMessage;
+        Type_0_cannot_be_used_as_an_index_type: DiagnosticMessage;
+        Cannot_assign_to_0_because_it_is_not_a_variable: DiagnosticMessage;
+        Cannot_assign_to_0_because_it_is_a_constant_or_a_read_only_property: DiagnosticMessage;
+        The_target_of_an_assignment_must_be_a_variable_or_a_property_access: DiagnosticMessage;
+        Index_signature_in_type_0_only_permits_reading: DiagnosticMessage;
+        Duplicate_identifier_newTarget_Compiler_uses_variable_declaration_newTarget_to_capture_new_target_meta_property_reference: DiagnosticMessage;
+        Expression_resolves_to_variable_declaration_newTarget_that_compiler_uses_to_capture_new_target_meta_property_reference: DiagnosticMessage;
+        A_mixin_class_must_have_a_constructor_with_a_single_rest_parameter_of_type_any: DiagnosticMessage;
+        Property_0_has_conflicting_declarations_and_is_inaccessible_in_type_1: DiagnosticMessage;
+        The_type_returned_by_the_next_method_of_an_async_iterator_must_be_a_promise_for_a_type_with_a_value_property: DiagnosticMessage;
+        Type_0_is_not_an_array_type_or_does_not_have_a_Symbol_iterator_method_that_returns_an_iterator: DiagnosticMessage;
+        Type_0_is_not_an_array_type_or_a_string_type_or_does_not_have_a_Symbol_iterator_method_that_returns_an_iterator: DiagnosticMessage;
+        Generic_type_instantiation_is_excessively_deep_and_possibly_infinite: DiagnosticMessage;
+        Property_0_does_not_exist_on_type_1_Did_you_mean_2: DiagnosticMessage;
+        Cannot_find_name_0_Did_you_mean_1: DiagnosticMessage;
+        Computed_values_are_not_permitted_in_an_enum_with_string_valued_members: DiagnosticMessage;
+        Expected_0_arguments_but_got_1: DiagnosticMessage;
+        Expected_at_least_0_arguments_but_got_1: DiagnosticMessage;
+        Expected_0_arguments_but_got_1_or_more: DiagnosticMessage;
+        Expected_at_least_0_arguments_but_got_1_or_more: DiagnosticMessage;
+        Expected_0_type_arguments_but_got_1: DiagnosticMessage;
+        Type_0_has_no_properties_in_common_with_type_1: DiagnosticMessage;
+        Value_of_type_0_has_no_properties_in_common_with_type_1_Did_you_mean_to_call_it: DiagnosticMessage;
+        Object_literal_may_only_specify_known_properties_but_0_does_not_exist_in_type_1_Did_you_mean_to_write_2: DiagnosticMessage;
+        Base_class_expressions_cannot_reference_class_type_parameters: DiagnosticMessage;
+        The_containing_function_or_module_body_is_too_large_for_control_flow_analysis: DiagnosticMessage;
+        Property_0_has_no_initializer_and_is_not_definitely_assigned_in_the_constructor: DiagnosticMessage;
+        Property_0_is_used_before_being_assigned: DiagnosticMessage;
+        A_rest_element_cannot_have_a_property_name: DiagnosticMessage;
+        Enum_declarations_can_only_merge_with_namespace_or_other_enum_declarations: DiagnosticMessage;
+        Type_0_is_not_an_array_type_Use_compiler_option_downlevelIteration_to_allow_iterating_of_iterators: DiagnosticMessage;
+        Type_0_is_not_an_array_type_or_a_string_type_Use_compiler_option_downlevelIteration_to_allow_iterating_of_iterators: DiagnosticMessage;
+        Property_0_does_not_exist_on_type_1_Did_you_forget_to_use_await: DiagnosticMessage;
+        Object_is_of_type_unknown: DiagnosticMessage;
+        JSX_element_attributes_type_0_may_not_be_a_union_type: DiagnosticMessage;
+        The_return_type_of_a_JSX_element_constructor_must_return_an_object_type: DiagnosticMessage;
+        JSX_element_implicitly_has_type_any_because_the_global_type_JSX_Element_does_not_exist: DiagnosticMessage;
+        Property_0_in_type_1_is_not_assignable_to_type_2: DiagnosticMessage;
+        JSX_element_type_0_does_not_have_any_construct_or_call_signatures: DiagnosticMessage;
+        JSX_element_type_0_is_not_a_constructor_function_for_JSX_elements: DiagnosticMessage;
+        Property_0_of_JSX_spread_attribute_is_not_assignable_to_target_property: DiagnosticMessage;
+        JSX_element_class_does_not_support_attributes_because_it_does_not_have_a_0_property: DiagnosticMessage;
+        The_global_type_JSX_0_may_not_have_more_than_one_property: DiagnosticMessage;
+        JSX_spread_child_must_be_an_array_type: DiagnosticMessage;
+        Cannot_augment_module_0_with_value_exports_because_it_resolves_to_a_non_module_entity: DiagnosticMessage;
+        A_member_initializer_in_a_enum_declaration_cannot_reference_members_declared_after_it_including_members_defined_in_other_enums: DiagnosticMessage;
+        Merged_declaration_0_cannot_include_a_default_export_declaration_Consider_adding_a_separate_export_default_0_declaration_instead: DiagnosticMessage;
+        Non_abstract_class_expression_does_not_implement_inherited_abstract_member_0_from_class_1: DiagnosticMessage;
+        Exported_external_package_typings_file_cannot_contain_tripleslash_references_Please_contact_the_package_author_to_update_the_package_definition: DiagnosticMessage;
+        Exported_external_package_typings_file_0_is_not_a_module_Please_contact_the_package_author_to_update_the_package_definition: DiagnosticMessage;
+        JSX_expressions_must_have_one_parent_element: DiagnosticMessage;
+        Type_0_provides_no_match_for_the_signature_1: DiagnosticMessage;
+        super_is_only_allowed_in_members_of_object_literal_expressions_when_option_target_is_ES2015_or_higher: DiagnosticMessage;
+        super_can_only_be_referenced_in_members_of_derived_classes_or_object_literal_expressions: DiagnosticMessage;
+        Cannot_export_0_Only_local_declarations_can_be_exported_from_a_module: DiagnosticMessage;
+        Cannot_find_name_0_Did_you_mean_the_static_member_1_0: DiagnosticMessage;
+        Cannot_find_name_0_Did_you_mean_the_instance_member_this_0: DiagnosticMessage;
+        Invalid_module_name_in_augmentation_module_0_cannot_be_found: DiagnosticMessage;
+        Invalid_module_name_in_augmentation_Module_0_resolves_to_an_untyped_module_at_1_which_cannot_be_augmented: DiagnosticMessage;
+        Exports_and_export_assignments_are_not_permitted_in_module_augmentations: DiagnosticMessage;
+        Imports_are_not_permitted_in_module_augmentations_Consider_moving_them_to_the_enclosing_external_module: DiagnosticMessage;
+        export_modifier_cannot_be_applied_to_ambient_modules_and_module_augmentations_since_they_are_always_visible: DiagnosticMessage;
+        Augmentations_for_the_global_scope_can_only_be_directly_nested_in_external_modules_or_ambient_module_declarations: DiagnosticMessage;
+        Augmentations_for_the_global_scope_should_have_declare_modifier_unless_they_appear_in_already_ambient_context: DiagnosticMessage;
+        Cannot_augment_module_0_because_it_resolves_to_a_non_module_entity: DiagnosticMessage;
+        Cannot_assign_a_0_constructor_type_to_a_1_constructor_type: DiagnosticMessage;
+        Constructor_of_class_0_is_private_and_only_accessible_within_the_class_declaration: DiagnosticMessage;
+        Constructor_of_class_0_is_protected_and_only_accessible_within_the_class_declaration: DiagnosticMessage;
+        Cannot_extend_a_class_0_Class_constructor_is_marked_as_private: DiagnosticMessage;
+        Accessors_must_both_be_abstract_or_non_abstract: DiagnosticMessage;
+        A_type_predicate_s_type_must_be_assignable_to_its_parameter_s_type: DiagnosticMessage;
+        Type_0_is_not_comparable_to_type_1: DiagnosticMessage;
+        A_function_that_is_called_with_the_new_keyword_cannot_have_a_this_type_that_is_void: DiagnosticMessage;
+        A_0_parameter_must_be_the_first_parameter: DiagnosticMessage;
+        A_constructor_cannot_have_a_this_parameter: DiagnosticMessage;
+        get_and_set_accessor_must_have_the_same_this_type: DiagnosticMessage;
+        this_implicitly_has_type_any_because_it_does_not_have_a_type_annotation: DiagnosticMessage;
+        The_this_context_of_type_0_is_not_assignable_to_method_s_this_of_type_1: DiagnosticMessage;
+        The_this_types_of_each_signature_are_incompatible: DiagnosticMessage;
+        _0_refers_to_a_UMD_global_but_the_current_file_is_a_module_Consider_adding_an_import_instead: DiagnosticMessage;
+        All_declarations_of_0_must_have_identical_modifiers: DiagnosticMessage;
+        Cannot_find_type_definition_file_for_0: DiagnosticMessage;
+        Cannot_extend_an_interface_0_Did_you_mean_implements: DiagnosticMessage;
+        An_import_path_cannot_end_with_a_0_extension_Consider_importing_1_instead: DiagnosticMessage;
+        _0_is_a_primitive_but_1_is_a_wrapper_object_Prefer_using_0_when_possible: DiagnosticMessage;
+        _0_only_refers_to_a_type_but_is_being_used_as_a_value_here: DiagnosticMessage;
+        Namespace_0_has_no_exported_member_1: DiagnosticMessage;
+        Left_side_of_comma_operator_is_unused_and_has_no_side_effects: DiagnosticMessage;
+        The_Object_type_is_assignable_to_very_few_other_types_Did_you_mean_to_use_the_any_type_instead: DiagnosticMessage;
+        An_async_function_or_method_must_return_a_Promise_Make_sure_you_have_a_declaration_for_Promise_or_include_ES2015_in_your_lib_option: DiagnosticMessage;
+        Spread_types_may_only_be_created_from_object_types: DiagnosticMessage;
+        Static_property_0_conflicts_with_built_in_property_Function_0_of_constructor_function_1: DiagnosticMessage;
+        Rest_types_may_only_be_created_from_object_types: DiagnosticMessage;
+        The_target_of_an_object_rest_assignment_must_be_a_variable_or_a_property_access: DiagnosticMessage;
+        _0_only_refers_to_a_type_but_is_being_used_as_a_namespace_here: DiagnosticMessage;
+        The_operand_of_a_delete_operator_must_be_a_property_reference: DiagnosticMessage;
+        The_operand_of_a_delete_operator_cannot_be_a_read_only_property: DiagnosticMessage;
+        An_async_function_or_method_in_ES5_SlashES3_requires_the_Promise_constructor_Make_sure_you_have_a_declaration_for_the_Promise_constructor_or_include_ES2015_in_your_lib_option: DiagnosticMessage;
+        Required_type_parameters_may_not_follow_optional_type_parameters: DiagnosticMessage;
+        Generic_type_0_requires_between_1_and_2_type_arguments: DiagnosticMessage;
+        Cannot_use_namespace_0_as_a_value: DiagnosticMessage;
+        Cannot_use_namespace_0_as_a_type: DiagnosticMessage;
+        _0_are_specified_twice_The_attribute_named_0_will_be_overwritten: DiagnosticMessage;
+        A_dynamic_import_call_returns_a_Promise_Make_sure_you_have_a_declaration_for_Promise_or_include_ES2015_in_your_lib_option: DiagnosticMessage;
+        A_dynamic_import_call_in_ES5_SlashES3_requires_the_Promise_constructor_Make_sure_you_have_a_declaration_for_the_Promise_constructor_or_include_ES2015_in_your_lib_option: DiagnosticMessage;
+        Cannot_access_0_1_because_0_is_a_type_but_not_a_namespace_Did_you_mean_to_retrieve_the_type_of_the_property_1_in_0_with_0_1: DiagnosticMessage;
+        The_expression_of_an_export_assignment_must_be_an_identifier_or_qualified_name_in_an_ambient_context: DiagnosticMessage;
+        Abstract_property_0_in_class_1_cannot_be_accessed_in_the_constructor: DiagnosticMessage;
+        Type_parameter_0_has_a_circular_default: DiagnosticMessage;
+        Subsequent_property_declarations_must_have_the_same_type_Property_0_must_be_of_type_1_but_here_has_type_2: DiagnosticMessage;
+        Duplicate_declaration_0: DiagnosticMessage;
+        Type_0_is_not_assignable_to_type_1_Two_different_types_with_this_name_exist_but_they_are_unrelated: DiagnosticMessage;
+        Class_0_incorrectly_implements_class_1_Did_you_mean_to_extend_1_and_inherit_its_members_as_a_subclass: DiagnosticMessage;
+        Cannot_invoke_an_object_which_is_possibly_null: DiagnosticMessage;
+        Cannot_invoke_an_object_which_is_possibly_undefined: DiagnosticMessage;
+        Cannot_invoke_an_object_which_is_possibly_null_or_undefined: DiagnosticMessage;
+        Module_0_has_no_exported_member_1_Did_you_mean_2: DiagnosticMessage;
+        Class_name_cannot_be_Object_when_targeting_ES5_with_module_0: DiagnosticMessage;
+        Cannot_find_lib_definition_for_0: DiagnosticMessage;
+        Cannot_find_lib_definition_for_0_Did_you_mean_1: DiagnosticMessage;
+        Import_declaration_0_is_using_private_name_1: DiagnosticMessage;
+        Type_parameter_0_of_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
+        Type_parameter_0_of_exported_interface_has_or_is_using_private_name_1: DiagnosticMessage;
+        Type_parameter_0_of_constructor_signature_from_exported_interface_has_or_is_using_private_name_1: DiagnosticMessage;
+        Type_parameter_0_of_call_signature_from_exported_interface_has_or_is_using_private_name_1: DiagnosticMessage;
+        Type_parameter_0_of_public_static_method_from_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
+        Type_parameter_0_of_public_method_from_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
+        Type_parameter_0_of_method_from_exported_interface_has_or_is_using_private_name_1: DiagnosticMessage;
+        Type_parameter_0_of_exported_function_has_or_is_using_private_name_1: DiagnosticMessage;
+        Implements_clause_of_exported_class_0_has_or_is_using_private_name_1: DiagnosticMessage;
+        extends_clause_of_exported_class_0_has_or_is_using_private_name_1: DiagnosticMessage;
+        extends_clause_of_exported_interface_0_has_or_is_using_private_name_1: DiagnosticMessage;
+        Exported_variable_0_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: DiagnosticMessage;
+        Exported_variable_0_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Exported_variable_0_has_or_is_using_private_name_1: DiagnosticMessage;
+        Public_static_property_0_of_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: DiagnosticMessage;
+        Public_static_property_0_of_exported_class_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Public_static_property_0_of_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
+        Public_property_0_of_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: DiagnosticMessage;
+        Public_property_0_of_exported_class_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Public_property_0_of_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
+        Property_0_of_exported_interface_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Property_0_of_exported_interface_has_or_is_using_private_name_1: DiagnosticMessage;
+        Parameter_type_of_public_static_setter_0_from_exported_class_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Parameter_type_of_public_static_setter_0_from_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
+        Parameter_type_of_public_setter_0_from_exported_class_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Parameter_type_of_public_setter_0_from_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
+        Return_type_of_public_static_getter_0_from_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: DiagnosticMessage;
+        Return_type_of_public_static_getter_0_from_exported_class_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Return_type_of_public_static_getter_0_from_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
+        Return_type_of_public_getter_0_from_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: DiagnosticMessage;
+        Return_type_of_public_getter_0_from_exported_class_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Return_type_of_public_getter_0_from_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
+        Return_type_of_constructor_signature_from_exported_interface_has_or_is_using_name_0_from_private_module_1: DiagnosticMessage;
+        Return_type_of_constructor_signature_from_exported_interface_has_or_is_using_private_name_0: DiagnosticMessage;
+        Return_type_of_call_signature_from_exported_interface_has_or_is_using_name_0_from_private_module_1: DiagnosticMessage;
+        Return_type_of_call_signature_from_exported_interface_has_or_is_using_private_name_0: DiagnosticMessage;
+        Return_type_of_index_signature_from_exported_interface_has_or_is_using_name_0_from_private_module_1: DiagnosticMessage;
+        Return_type_of_index_signature_from_exported_interface_has_or_is_using_private_name_0: DiagnosticMessage;
+        Return_type_of_public_static_method_from_exported_class_has_or_is_using_name_0_from_external_module_1_but_cannot_be_named: DiagnosticMessage;
+        Return_type_of_public_static_method_from_exported_class_has_or_is_using_name_0_from_private_module_1: DiagnosticMessage;
+        Return_type_of_public_static_method_from_exported_class_has_or_is_using_private_name_0: DiagnosticMessage;
+        Return_type_of_public_method_from_exported_class_has_or_is_using_name_0_from_external_module_1_but_cannot_be_named: DiagnosticMessage;
+        Return_type_of_public_method_from_exported_class_has_or_is_using_name_0_from_private_module_1: DiagnosticMessage;
+        Return_type_of_public_method_from_exported_class_has_or_is_using_private_name_0: DiagnosticMessage;
+        Return_type_of_method_from_exported_interface_has_or_is_using_name_0_from_private_module_1: DiagnosticMessage;
+        Return_type_of_method_from_exported_interface_has_or_is_using_private_name_0: DiagnosticMessage;
+        Return_type_of_exported_function_has_or_is_using_name_0_from_external_module_1_but_cannot_be_named: DiagnosticMessage;
+        Return_type_of_exported_function_has_or_is_using_name_0_from_private_module_1: DiagnosticMessage;
+        Return_type_of_exported_function_has_or_is_using_private_name_0: DiagnosticMessage;
+        Parameter_0_of_constructor_from_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: DiagnosticMessage;
+        Parameter_0_of_constructor_from_exported_class_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Parameter_0_of_constructor_from_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
+        Parameter_0_of_constructor_signature_from_exported_interface_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Parameter_0_of_constructor_signature_from_exported_interface_has_or_is_using_private_name_1: DiagnosticMessage;
+        Parameter_0_of_call_signature_from_exported_interface_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Parameter_0_of_call_signature_from_exported_interface_has_or_is_using_private_name_1: DiagnosticMessage;
+        Parameter_0_of_public_static_method_from_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: DiagnosticMessage;
+        Parameter_0_of_public_static_method_from_exported_class_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Parameter_0_of_public_static_method_from_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
+        Parameter_0_of_public_method_from_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: DiagnosticMessage;
+        Parameter_0_of_public_method_from_exported_class_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Parameter_0_of_public_method_from_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
+        Parameter_0_of_method_from_exported_interface_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Parameter_0_of_method_from_exported_interface_has_or_is_using_private_name_1: DiagnosticMessage;
+        Parameter_0_of_exported_function_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: DiagnosticMessage;
+        Parameter_0_of_exported_function_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Parameter_0_of_exported_function_has_or_is_using_private_name_1: DiagnosticMessage;
+        Exported_type_alias_0_has_or_is_using_private_name_1: DiagnosticMessage;
+        Default_export_of_the_module_has_or_is_using_private_name_0: DiagnosticMessage;
+        Type_parameter_0_of_exported_type_alias_has_or_is_using_private_name_1: DiagnosticMessage;
+        Conflicting_definitions_for_0_found_at_1_and_2_Consider_installing_a_specific_version_of_this_library_to_resolve_the_conflict: DiagnosticMessage;
+        Parameter_0_of_index_signature_from_exported_interface_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Parameter_0_of_index_signature_from_exported_interface_has_or_is_using_private_name_1: DiagnosticMessage;
+        Property_0_of_exported_class_expression_may_not_be_private_or_protected: DiagnosticMessage;
+        Public_static_method_0_of_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: DiagnosticMessage;
+        Public_static_method_0_of_exported_class_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Public_static_method_0_of_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
+        Public_method_0_of_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: DiagnosticMessage;
+        Public_method_0_of_exported_class_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Public_method_0_of_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
+        Method_0_of_exported_interface_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Method_0_of_exported_interface_has_or_is_using_private_name_1: DiagnosticMessage;
+        The_current_host_does_not_support_the_0_option: DiagnosticMessage;
+        Cannot_find_the_common_subdirectory_path_for_the_input_files: DiagnosticMessage;
+        File_specification_cannot_end_in_a_recursive_directory_wildcard_Asterisk_Asterisk_Colon_0: DiagnosticMessage;
+        Cannot_read_file_0_Colon_1: DiagnosticMessage;
+        Failed_to_parse_file_0_Colon_1: DiagnosticMessage;
+        Unknown_compiler_option_0: DiagnosticMessage;
+        Compiler_option_0_requires_a_value_of_type_1: DiagnosticMessage;
+        Could_not_write_file_0_Colon_1: DiagnosticMessage;
+        Option_project_cannot_be_mixed_with_source_files_on_a_command_line: DiagnosticMessage;
+        Option_isolatedModules_can_only_be_used_when_either_option_module_is_provided_or_option_target_is_ES2015_or_higher: DiagnosticMessage;
+        Option_0_can_only_be_used_when_either_option_inlineSourceMap_or_option_sourceMap_is_provided: DiagnosticMessage;
+        Option_0_cannot_be_specified_without_specifying_option_1: DiagnosticMessage;
+        Option_0_cannot_be_specified_with_option_1: DiagnosticMessage;
+        A_tsconfig_json_file_is_already_defined_at_Colon_0: DiagnosticMessage;
+        Cannot_write_file_0_because_it_would_overwrite_input_file: DiagnosticMessage;
+        Cannot_write_file_0_because_it_would_be_overwritten_by_multiple_input_files: DiagnosticMessage;
+        Cannot_find_a_tsconfig_json_file_at_the_specified_directory_Colon_0: DiagnosticMessage;
+        The_specified_path_does_not_exist_Colon_0: DiagnosticMessage;
+        Invalid_value_for_reactNamespace_0_is_not_a_valid_identifier: DiagnosticMessage;
+        Option_paths_cannot_be_used_without_specifying_baseUrl_option: DiagnosticMessage;
+        Pattern_0_can_have_at_most_one_Asterisk_character: DiagnosticMessage;
+        Substitution_0_in_pattern_1_in_can_have_at_most_one_Asterisk_character: DiagnosticMessage;
+        Substitutions_for_pattern_0_should_be_an_array: DiagnosticMessage;
+        Substitution_0_for_pattern_1_has_incorrect_type_expected_string_got_2: DiagnosticMessage;
+        File_specification_cannot_contain_a_parent_directory_that_appears_after_a_recursive_directory_wildcard_Asterisk_Asterisk_Colon_0: DiagnosticMessage;
+        Substitutions_for_pattern_0_shouldn_t_be_an_empty_array: DiagnosticMessage;
+        Invalid_value_for_jsxFactory_0_is_not_a_valid_identifier_or_qualified_name: DiagnosticMessage;
+        Adding_a_tsconfig_json_file_will_help_organize_projects_that_contain_both_TypeScript_and_JavaScript_files_Learn_more_at_https_Colon_Slash_Slashaka_ms_Slashtsconfig: DiagnosticMessage;
+        Option_0_cannot_be_specified_without_specifying_option_1_or_option_2: DiagnosticMessage;
+        Option_resolveJsonModule_cannot_be_specified_without_node_module_resolution_strategy: DiagnosticMessage;
+        Generates_a_sourcemap_for_each_corresponding_d_ts_file: DiagnosticMessage;
+        Concatenate_and_emit_output_to_single_file: DiagnosticMessage;
+        Generates_corresponding_d_ts_file: DiagnosticMessage;
+        Specify_the_location_where_debugger_should_locate_map_files_instead_of_generated_locations: DiagnosticMessage;
+        Specify_the_location_where_debugger_should_locate_TypeScript_files_instead_of_source_locations: DiagnosticMessage;
+        Watch_input_files: DiagnosticMessage;
+        Redirect_output_structure_to_the_directory: DiagnosticMessage;
+        Do_not_erase_const_enum_declarations_in_generated_code: DiagnosticMessage;
+        Do_not_emit_outputs_if_any_errors_were_reported: DiagnosticMessage;
+        Do_not_emit_comments_to_output: DiagnosticMessage;
+        Do_not_emit_outputs: DiagnosticMessage;
+        Allow_default_imports_from_modules_with_no_default_export_This_does_not_affect_code_emit_just_typechecking: DiagnosticMessage;
+        Skip_type_checking_of_declaration_files: DiagnosticMessage;
+        Do_not_resolve_the_real_path_of_symlinks: DiagnosticMessage;
+        Only_emit_d_ts_declaration_files: DiagnosticMessage;
+        Specify_ECMAScript_target_version_Colon_ES3_default_ES5_ES2015_ES2016_ES2017_ES2018_or_ESNEXT: DiagnosticMessage;
+        Specify_module_code_generation_Colon_none_commonjs_amd_system_umd_es2015_or_ESNext: DiagnosticMessage;
+        Print_this_message: DiagnosticMessage;
+        Print_the_compiler_s_version: DiagnosticMessage;
+        Compile_the_project_given_the_path_to_its_configuration_file_or_to_a_folder_with_a_tsconfig_json: DiagnosticMessage;
+        Syntax_Colon_0: DiagnosticMessage;
+        options: DiagnosticMessage;
+        file: DiagnosticMessage;
+        Examples_Colon_0: DiagnosticMessage;
+        Options_Colon: DiagnosticMessage;
+        Version_0: DiagnosticMessage;
+        Insert_command_line_options_and_files_from_a_file: DiagnosticMessage;
+        Starting_compilation_in_watch_mode: DiagnosticMessage;
+        File_change_detected_Starting_incremental_compilation: DiagnosticMessage;
+        KIND: DiagnosticMessage;
+        FILE: DiagnosticMessage;
+        VERSION: DiagnosticMessage;
+        LOCATION: DiagnosticMessage;
+        DIRECTORY: DiagnosticMessage;
+        STRATEGY: DiagnosticMessage;
+        FILE_OR_DIRECTORY: DiagnosticMessage;
+        Generates_corresponding_map_file: DiagnosticMessage;
+        Compiler_option_0_expects_an_argument: DiagnosticMessage;
+        Unterminated_quoted_string_in_response_file_0: DiagnosticMessage;
+        Argument_for_0_option_must_be_Colon_1: DiagnosticMessage;
+        Locale_must_be_of_the_form_language_or_language_territory_For_example_0_or_1: DiagnosticMessage;
+        Unsupported_locale_0: DiagnosticMessage;
+        Unable_to_open_file_0: DiagnosticMessage;
+        Corrupted_locale_file_0: DiagnosticMessage;
+        Raise_error_on_expressions_and_declarations_with_an_implied_any_type: DiagnosticMessage;
+        File_0_not_found: DiagnosticMessage;
+        File_0_has_unsupported_extension_The_only_supported_extensions_are_1: DiagnosticMessage;
+        Suppress_noImplicitAny_errors_for_indexing_objects_lacking_index_signatures: DiagnosticMessage;
+        Do_not_emit_declarations_for_code_that_has_an_internal_annotation: DiagnosticMessage;
+        Specify_the_root_directory_of_input_files_Use_to_control_the_output_directory_structure_with_outDir: DiagnosticMessage;
+        File_0_is_not_under_rootDir_1_rootDir_is_expected_to_contain_all_source_files: DiagnosticMessage;
+        Specify_the_end_of_line_sequence_to_be_used_when_emitting_files_Colon_CRLF_dos_or_LF_unix: DiagnosticMessage;
+        NEWLINE: DiagnosticMessage;
+        Option_0_can_only_be_specified_in_tsconfig_json_file: DiagnosticMessage;
+        Enables_experimental_support_for_ES7_decorators: DiagnosticMessage;
+        Enables_experimental_support_for_emitting_type_metadata_for_decorators: DiagnosticMessage;
+        Enables_experimental_support_for_ES7_async_functions: DiagnosticMessage;
+        Specify_module_resolution_strategy_Colon_node_Node_js_or_classic_TypeScript_pre_1_6: DiagnosticMessage;
+        Initializes_a_TypeScript_project_and_creates_a_tsconfig_json_file: DiagnosticMessage;
+        Successfully_created_a_tsconfig_json_file: DiagnosticMessage;
+        Suppress_excess_property_checks_for_object_literals: DiagnosticMessage;
+        Stylize_errors_and_messages_using_color_and_context_experimental: DiagnosticMessage;
+        Do_not_report_errors_on_unused_labels: DiagnosticMessage;
+        Report_error_when_not_all_code_paths_in_function_return_a_value: DiagnosticMessage;
+        Report_errors_for_fallthrough_cases_in_switch_statement: DiagnosticMessage;
+        Do_not_report_errors_on_unreachable_code: DiagnosticMessage;
+        Disallow_inconsistently_cased_references_to_the_same_file: DiagnosticMessage;
+        Specify_library_files_to_be_included_in_the_compilation: DiagnosticMessage;
+        Specify_JSX_code_generation_Colon_preserve_react_native_or_react: DiagnosticMessage;
+        File_0_has_an_unsupported_extension_so_skipping_it: DiagnosticMessage;
+        Only_amd_and_system_modules_are_supported_alongside_0: DiagnosticMessage;
+        Base_directory_to_resolve_non_absolute_module_names: DiagnosticMessage;
+        Deprecated_Use_jsxFactory_instead_Specify_the_object_invoked_for_createElement_when_targeting_react_JSX_emit: DiagnosticMessage;
+        Enable_tracing_of_the_name_resolution_process: DiagnosticMessage;
+        Resolving_module_0_from_1: DiagnosticMessage;
+        Explicitly_specified_module_resolution_kind_Colon_0: DiagnosticMessage;
+        Module_resolution_kind_is_not_specified_using_0: DiagnosticMessage;
+        Module_name_0_was_successfully_resolved_to_1: DiagnosticMessage;
+        Module_name_0_was_not_resolved: DiagnosticMessage;
+        paths_option_is_specified_looking_for_a_pattern_to_match_module_name_0: DiagnosticMessage;
+        Module_name_0_matched_pattern_1: DiagnosticMessage;
+        Trying_substitution_0_candidate_module_location_Colon_1: DiagnosticMessage;
+        Resolving_module_name_0_relative_to_base_url_1_2: DiagnosticMessage;
+        Loading_module_as_file_Slash_folder_candidate_module_location_0_target_file_type_1: DiagnosticMessage;
+        File_0_does_not_exist: DiagnosticMessage;
+        File_0_exist_use_it_as_a_name_resolution_result: DiagnosticMessage;
+        Loading_module_0_from_node_modules_folder_target_file_type_1: DiagnosticMessage;
+        Found_package_json_at_0: DiagnosticMessage;
+        package_json_does_not_have_a_0_field: DiagnosticMessage;
+        package_json_has_0_field_1_that_references_2: DiagnosticMessage;
+        Allow_javascript_files_to_be_compiled: DiagnosticMessage;
+        Option_0_should_have_array_of_strings_as_a_value: DiagnosticMessage;
+        Checking_if_0_is_the_longest_matching_prefix_for_1_2: DiagnosticMessage;
+        Expected_type_of_0_field_in_package_json_to_be_string_got_1: DiagnosticMessage;
+        baseUrl_option_is_set_to_0_using_this_value_to_resolve_non_relative_module_name_1: DiagnosticMessage;
+        rootDirs_option_is_set_using_it_to_resolve_relative_module_name_0: DiagnosticMessage;
+        Longest_matching_prefix_for_0_is_1: DiagnosticMessage;
+        Loading_0_from_the_root_dir_1_candidate_location_2: DiagnosticMessage;
+        Trying_other_entries_in_rootDirs: DiagnosticMessage;
+        Module_resolution_using_rootDirs_has_failed: DiagnosticMessage;
+        Do_not_emit_use_strict_directives_in_module_output: DiagnosticMessage;
+        Enable_strict_null_checks: DiagnosticMessage;
+        Unknown_option_excludes_Did_you_mean_exclude: DiagnosticMessage;
+        Raise_error_on_this_expressions_with_an_implied_any_type: DiagnosticMessage;
+        Resolving_type_reference_directive_0_containing_file_1_root_directory_2: DiagnosticMessage;
+        Resolving_using_primary_search_paths: DiagnosticMessage;
+        Resolving_from_node_modules_folder: DiagnosticMessage;
+        Type_reference_directive_0_was_successfully_resolved_to_1_primary_Colon_2: DiagnosticMessage;
+        Type_reference_directive_0_was_not_resolved: DiagnosticMessage;
+        Resolving_with_primary_search_path_0: DiagnosticMessage;
+        Root_directory_cannot_be_determined_skipping_primary_search_paths: DiagnosticMessage;
+        Resolving_type_reference_directive_0_containing_file_1_root_directory_not_set: DiagnosticMessage;
+        Type_declaration_files_to_be_included_in_compilation: DiagnosticMessage;
+        Looking_up_in_node_modules_folder_initial_location_0: DiagnosticMessage;
+        Containing_file_is_not_specified_and_root_directory_cannot_be_determined_skipping_lookup_in_node_modules_folder: DiagnosticMessage;
+        Resolving_type_reference_directive_0_containing_file_not_set_root_directory_1: DiagnosticMessage;
+        Resolving_type_reference_directive_0_containing_file_not_set_root_directory_not_set: DiagnosticMessage;
+        Resolving_real_path_for_0_result_1: DiagnosticMessage;
+        Cannot_compile_modules_using_option_0_unless_the_module_flag_is_amd_or_system: DiagnosticMessage;
+        File_name_0_has_a_1_extension_stripping_it: DiagnosticMessage;
+        _0_is_declared_but_its_value_is_never_read: DiagnosticMessage;
+        Report_errors_on_unused_locals: DiagnosticMessage;
+        Report_errors_on_unused_parameters: DiagnosticMessage;
+        The_maximum_dependency_depth_to_search_under_node_modules_and_load_JavaScript_files: DiagnosticMessage;
+        Cannot_import_type_declaration_files_Consider_importing_0_instead_of_1: DiagnosticMessage;
+        Property_0_is_declared_but_its_value_is_never_read: DiagnosticMessage;
+        Import_emit_helpers_from_tslib: DiagnosticMessage;
+        Auto_discovery_for_typings_is_enabled_in_project_0_Running_extra_resolution_pass_for_module_1_using_cache_location_2: DiagnosticMessage;
+        Parse_in_strict_mode_and_emit_use_strict_for_each_source_file: DiagnosticMessage;
+        Module_0_was_resolved_to_1_but_jsx_is_not_set: DiagnosticMessage;
+        Module_0_was_resolved_as_locally_declared_ambient_module_in_file_1: DiagnosticMessage;
+        Module_0_was_resolved_as_ambient_module_declared_in_1_since_this_file_was_not_modified: DiagnosticMessage;
+        Specify_the_JSX_factory_function_to_use_when_targeting_react_JSX_emit_e_g_React_createElement_or_h: DiagnosticMessage;
+        Resolution_for_module_0_was_found_in_cache_from_location_1: DiagnosticMessage;
+        Directory_0_does_not_exist_skipping_all_lookups_in_it: DiagnosticMessage;
+        Show_diagnostic_information: DiagnosticMessage;
+        Show_verbose_diagnostic_information: DiagnosticMessage;
+        Emit_a_single_file_with_source_maps_instead_of_having_a_separate_file: DiagnosticMessage;
+        Emit_the_source_alongside_the_sourcemaps_within_a_single_file_requires_inlineSourceMap_or_sourceMap_to_be_set: DiagnosticMessage;
+        Transpile_each_file_as_a_separate_module_similar_to_ts_transpileModule: DiagnosticMessage;
+        Print_names_of_generated_files_part_of_the_compilation: DiagnosticMessage;
+        Print_names_of_files_part_of_the_compilation: DiagnosticMessage;
+        The_locale_used_when_displaying_messages_to_the_user_e_g_en_us: DiagnosticMessage;
+        Do_not_generate_custom_helper_functions_like_extends_in_compiled_output: DiagnosticMessage;
+        Do_not_include_the_default_library_file_lib_d_ts: DiagnosticMessage;
+        Do_not_add_triple_slash_references_or_imported_modules_to_the_list_of_compiled_files: DiagnosticMessage;
+        Deprecated_Use_skipLibCheck_instead_Skip_type_checking_of_default_library_declaration_files: DiagnosticMessage;
+        List_of_folders_to_include_type_definitions_from: DiagnosticMessage;
+        Disable_size_limitations_on_JavaScript_projects: DiagnosticMessage;
+        The_character_set_of_the_input_files: DiagnosticMessage;
+        Emit_a_UTF_8_Byte_Order_Mark_BOM_in_the_beginning_of_output_files: DiagnosticMessage;
+        Do_not_truncate_error_messages: DiagnosticMessage;
+        Output_directory_for_generated_declaration_files: DiagnosticMessage;
+        A_series_of_entries_which_re_map_imports_to_lookup_locations_relative_to_the_baseUrl: DiagnosticMessage;
+        List_of_root_folders_whose_combined_content_represents_the_structure_of_the_project_at_runtime: DiagnosticMessage;
+        Show_all_compiler_options: DiagnosticMessage;
+        Deprecated_Use_outFile_instead_Concatenate_and_emit_output_to_single_file: DiagnosticMessage;
+        Command_line_Options: DiagnosticMessage;
+        Basic_Options: DiagnosticMessage;
+        Strict_Type_Checking_Options: DiagnosticMessage;
+        Module_Resolution_Options: DiagnosticMessage;
+        Source_Map_Options: DiagnosticMessage;
+        Additional_Checks: DiagnosticMessage;
+        Experimental_Options: DiagnosticMessage;
+        Advanced_Options: DiagnosticMessage;
+        Provide_full_support_for_iterables_in_for_of_spread_and_destructuring_when_targeting_ES5_or_ES3: DiagnosticMessage;
+        Enable_all_strict_type_checking_options: DiagnosticMessage;
+        List_of_language_service_plugins: DiagnosticMessage;
+        Scoped_package_detected_looking_in_0: DiagnosticMessage;
+        Reusing_resolution_of_module_0_to_file_1_from_old_program: DiagnosticMessage;
+        Reusing_module_resolutions_originating_in_0_since_resolutions_are_unchanged_from_old_program: DiagnosticMessage;
+        Disable_strict_checking_of_generic_signatures_in_function_types: DiagnosticMessage;
+        Enable_strict_checking_of_function_types: DiagnosticMessage;
+        Enable_strict_checking_of_property_initialization_in_classes: DiagnosticMessage;
+        Numeric_separators_are_not_allowed_here: DiagnosticMessage;
+        Multiple_consecutive_numeric_separators_are_not_permitted: DiagnosticMessage;
+        Found_package_json_at_0_Package_ID_is_1: DiagnosticMessage;
+        Whether_to_keep_outdated_console_output_in_watch_mode_instead_of_clearing_the_screen: DiagnosticMessage;
+        All_imports_in_import_declaration_are_unused: DiagnosticMessage;
+        Found_1_error_Watching_for_file_changes: DiagnosticMessage;
+        Found_0_errors_Watching_for_file_changes: DiagnosticMessage;
+        Resolve_keyof_to_string_valued_property_names_only_no_numbers_or_symbols: DiagnosticMessage;
+        _0_is_declared_but_never_used: DiagnosticMessage;
+        Include_modules_imported_with_json_extension: DiagnosticMessage;
+        All_destructured_elements_are_unused: DiagnosticMessage;
+        All_variables_are_unused: DiagnosticMessage;
+        Projects_to_reference: DiagnosticMessage;
+        Enable_project_compilation: DiagnosticMessage;
+        Project_references_may_not_form_a_circular_graph_Cycle_detected_Colon_0: DiagnosticMessage;
+        Composite_projects_may_not_disable_declaration_emit: DiagnosticMessage;
+        Output_file_0_has_not_been_built_from_source_file_1: DiagnosticMessage;
+        Referenced_project_0_must_have_setting_composite_Colon_true: DiagnosticMessage;
+        File_0_is_not_in_project_file_list_Projects_must_list_all_files_or_use_an_include_pattern: DiagnosticMessage;
+        Cannot_prepend_project_0_because_it_does_not_have_outFile_set: DiagnosticMessage;
+        Output_file_0_from_project_1_does_not_exist: DiagnosticMessage;
+        Project_0_is_out_of_date_because_oldest_output_1_is_older_than_newest_input_2: DiagnosticMessage;
+        Project_0_is_up_to_date_because_newest_input_1_is_older_than_oldest_output_2: DiagnosticMessage;
+        Project_0_is_out_of_date_because_output_file_1_does_not_exist: DiagnosticMessage;
+        Project_0_is_out_of_date_because_its_dependency_1_is_out_of_date: DiagnosticMessage;
+        Project_0_is_up_to_date_with_d_ts_files_from_its_dependencies: DiagnosticMessage;
+        Projects_in_this_build_Colon_0: DiagnosticMessage;
+        A_non_dry_build_would_delete_the_following_files_Colon_0: DiagnosticMessage;
+        A_non_dry_build_would_build_project_0: DiagnosticMessage;
+        Building_project_0: DiagnosticMessage;
+        Updating_output_timestamps_of_project_0: DiagnosticMessage;
+        delete_this_Project_0_is_up_to_date_because_it_was_previously_built: DiagnosticMessage;
+        Project_0_is_up_to_date: DiagnosticMessage;
+        Skipping_build_of_project_0_because_its_dependency_1_has_errors: DiagnosticMessage;
+        Project_0_can_t_be_built_because_its_dependency_1_has_errors: DiagnosticMessage;
+        Build_one_or_more_projects_and_their_dependencies_if_out_of_date: DiagnosticMessage;
+        Delete_the_outputs_of_all_projects: DiagnosticMessage;
+        Enable_verbose_logging: DiagnosticMessage;
+        Show_what_would_be_built_or_deleted_if_specified_with_clean: DiagnosticMessage;
+        Build_all_projects_including_those_that_appear_to_be_up_to_date: DiagnosticMessage;
+        Option_build_must_be_the_first_command_line_argument: DiagnosticMessage;
+        Options_0_and_1_cannot_be_combined: DiagnosticMessage;
+        Skipping_clean_because_not_all_projects_could_be_located: DiagnosticMessage;
+        Variable_0_implicitly_has_an_1_type: DiagnosticMessage;
+        Parameter_0_implicitly_has_an_1_type: DiagnosticMessage;
+        Member_0_implicitly_has_an_1_type: DiagnosticMessage;
+        new_expression_whose_target_lacks_a_construct_signature_implicitly_has_an_any_type: DiagnosticMessage;
+        _0_which_lacks_return_type_annotation_implicitly_has_an_1_return_type: DiagnosticMessage;
+        Function_expression_which_lacks_return_type_annotation_implicitly_has_an_0_return_type: DiagnosticMessage;
+        Construct_signature_which_lacks_return_type_annotation_implicitly_has_an_any_return_type: DiagnosticMessage;
+        Element_implicitly_has_an_any_type_because_index_expression_is_not_of_type_number: DiagnosticMessage;
+        Could_not_find_a_declaration_file_for_module_0_1_implicitly_has_an_any_type: DiagnosticMessage;
+        Element_implicitly_has_an_any_type_because_type_0_has_no_index_signature: DiagnosticMessage;
+        Object_literal_s_property_0_implicitly_has_an_1_type: DiagnosticMessage;
+        Rest_parameter_0_implicitly_has_an_any_type: DiagnosticMessage;
+        Call_signature_which_lacks_return_type_annotation_implicitly_has_an_any_return_type: DiagnosticMessage;
+        _0_implicitly_has_type_any_because_it_does_not_have_a_type_annotation_and_is_referenced_directly_or_indirectly_in_its_own_initializer: DiagnosticMessage;
+        _0_implicitly_has_return_type_any_because_it_does_not_have_a_return_type_annotation_and_is_referenced_directly_or_indirectly_in_one_of_its_return_expressions: DiagnosticMessage;
+        Function_implicitly_has_return_type_any_because_it_does_not_have_a_return_type_annotation_and_is_referenced_directly_or_indirectly_in_one_of_its_return_expressions: DiagnosticMessage;
+        Generator_implicitly_has_type_0_because_it_does_not_yield_any_values_Consider_supplying_a_return_type: DiagnosticMessage;
+        JSX_element_implicitly_has_type_any_because_no_interface_JSX_0_exists: DiagnosticMessage;
+        Unreachable_code_detected: DiagnosticMessage;
+        Unused_label: DiagnosticMessage;
+        Fallthrough_case_in_switch: DiagnosticMessage;
+        Not_all_code_paths_return_a_value: DiagnosticMessage;
+        Binding_element_0_implicitly_has_an_1_type: DiagnosticMessage;
+        Property_0_implicitly_has_type_any_because_its_set_accessor_lacks_a_parameter_type_annotation: DiagnosticMessage;
+        Property_0_implicitly_has_type_any_because_its_get_accessor_lacks_a_return_type_annotation: DiagnosticMessage;
+        Variable_0_implicitly_has_type_1_in_some_locations_where_its_type_cannot_be_determined: DiagnosticMessage;
+        Try_npm_install_types_Slash_0_if_it_exists_or_add_a_new_declaration_d_ts_file_containing_declare_module_0: DiagnosticMessage;
+        Dynamic_import_s_specifier_must_be_of_type_string_but_here_has_type_0: DiagnosticMessage;
+        Enables_emit_interoperability_between_CommonJS_and_ES_Modules_via_creation_of_namespace_objects_for_all_imports_Implies_allowSyntheticDefaultImports: DiagnosticMessage;
+        A_namespace_style_import_cannot_be_called_or_constructed_and_will_cause_a_failure_at_runtime: DiagnosticMessage;
+        Mapped_object_type_implicitly_has_an_any_template_type: DiagnosticMessage;
+        You_cannot_rename_this_element: DiagnosticMessage;
+        You_cannot_rename_elements_that_are_defined_in_the_standard_TypeScript_library: DiagnosticMessage;
+        import_can_only_be_used_in_a_ts_file: DiagnosticMessage;
+        export_can_only_be_used_in_a_ts_file: DiagnosticMessage;
+        type_parameter_declarations_can_only_be_used_in_a_ts_file: DiagnosticMessage;
+        implements_clauses_can_only_be_used_in_a_ts_file: DiagnosticMessage;
+        interface_declarations_can_only_be_used_in_a_ts_file: DiagnosticMessage;
+        module_declarations_can_only_be_used_in_a_ts_file: DiagnosticMessage;
+        type_aliases_can_only_be_used_in_a_ts_file: DiagnosticMessage;
+        _0_can_only_be_used_in_a_ts_file: DiagnosticMessage;
+        types_can_only_be_used_in_a_ts_file: DiagnosticMessage;
+        type_arguments_can_only_be_used_in_a_ts_file: DiagnosticMessage;
+        parameter_modifiers_can_only_be_used_in_a_ts_file: DiagnosticMessage;
+        non_null_assertions_can_only_be_used_in_a_ts_file: DiagnosticMessage;
+        enum_declarations_can_only_be_used_in_a_ts_file: DiagnosticMessage;
+        type_assertion_expressions_can_only_be_used_in_a_ts_file: DiagnosticMessage;
+        Octal_literal_types_must_use_ES2015_syntax_Use_the_syntax_0: DiagnosticMessage;
+        Octal_literals_are_not_allowed_in_enums_members_initializer_Use_the_syntax_0: DiagnosticMessage;
+        Report_errors_in_js_files: DiagnosticMessage;
+        JSDoc_types_can_only_be_used_inside_documentation_comments: DiagnosticMessage;
+        JSDoc_typedef_tag_should_either_have_a_type_annotation_or_be_followed_by_property_or_member_tags: DiagnosticMessage;
+        JSDoc_0_is_not_attached_to_a_class: DiagnosticMessage;
+        JSDoc_0_1_does_not_match_the_extends_2_clause: DiagnosticMessage;
+        JSDoc_param_tag_has_name_0_but_there_is_no_parameter_with_that_name: DiagnosticMessage;
+        Class_declarations_cannot_have_more_than_one_augments_or_extends_tag: DiagnosticMessage;
+        Expected_0_type_arguments_provide_these_with_an_extends_tag: DiagnosticMessage;
+        Expected_0_1_type_arguments_provide_these_with_an_extends_tag: DiagnosticMessage;
+        JSDoc_may_only_appear_in_the_last_parameter_of_a_signature: DiagnosticMessage;
+        JSDoc_param_tag_has_name_0_but_there_is_no_parameter_with_that_name_It_would_match_arguments_if_it_had_an_array_type: DiagnosticMessage;
+        Only_identifiers_Slashqualified_names_with_optional_type_arguments_are_currently_supported_in_a_class_extends_clause: DiagnosticMessage;
+        class_expressions_are_not_currently_supported: DiagnosticMessage;
+        Language_service_is_disabled: DiagnosticMessage;
+        JSX_attributes_must_only_be_assigned_a_non_empty_expression: DiagnosticMessage;
+        JSX_elements_cannot_have_multiple_attributes_with_the_same_name: DiagnosticMessage;
+        Expected_corresponding_JSX_closing_tag_for_0: DiagnosticMessage;
+        JSX_attribute_expected: DiagnosticMessage;
+        Cannot_use_JSX_unless_the_jsx_flag_is_provided: DiagnosticMessage;
+        A_constructor_cannot_contain_a_super_call_when_its_class_extends_null: DiagnosticMessage;
+        An_unary_expression_with_the_0_operator_is_not_allowed_in_the_left_hand_side_of_an_exponentiation_expression_Consider_enclosing_the_expression_in_parentheses: DiagnosticMessage;
+        A_type_assertion_expression_is_not_allowed_in_the_left_hand_side_of_an_exponentiation_expression_Consider_enclosing_the_expression_in_parentheses: DiagnosticMessage;
+        JSX_element_0_has_no_corresponding_closing_tag: DiagnosticMessage;
+        super_must_be_called_before_accessing_this_in_the_constructor_of_a_derived_class: DiagnosticMessage;
+        Unknown_type_acquisition_option_0: DiagnosticMessage;
+        super_must_be_called_before_accessing_a_property_of_super_in_the_constructor_of_a_derived_class: DiagnosticMessage;
+        _0_is_not_a_valid_meta_property_for_keyword_1_Did_you_mean_2: DiagnosticMessage;
+        Meta_property_0_is_only_allowed_in_the_body_of_a_function_declaration_function_expression_or_constructor: DiagnosticMessage;
+        JSX_fragment_has_no_corresponding_closing_tag: DiagnosticMessage;
+        Expected_corresponding_closing_tag_for_JSX_fragment: DiagnosticMessage;
+        JSX_fragment_is_not_supported_when_using_jsxFactory: DiagnosticMessage;
+        JSX_fragment_is_not_supported_when_using_an_inline_JSX_factory_pragma: DiagnosticMessage;
+        Circularity_detected_while_resolving_configuration_Colon_0: DiagnosticMessage;
+        A_path_in_an_extends_option_must_be_relative_or_rooted_but_0_is_not: DiagnosticMessage;
+        The_files_list_in_config_file_0_is_empty: DiagnosticMessage;
+        No_inputs_were_found_in_config_file_0_Specified_include_paths_were_1_and_exclude_paths_were_2: DiagnosticMessage;
+        File_is_a_CommonJS_module_it_may_be_converted_to_an_ES6_module: DiagnosticMessage;
+        This_constructor_function_may_be_converted_to_a_class_declaration: DiagnosticMessage;
+        Import_may_be_converted_to_a_default_import: DiagnosticMessage;
+        JSDoc_types_may_be_moved_to_TypeScript_types: DiagnosticMessage;
+        require_call_may_be_converted_to_an_import: DiagnosticMessage;
+        Add_missing_super_call: DiagnosticMessage;
+        Make_super_call_the_first_statement_in_the_constructor: DiagnosticMessage;
+        Change_extends_to_implements: DiagnosticMessage;
+        Remove_declaration_for_Colon_0: DiagnosticMessage;
+        Remove_import_from_0: DiagnosticMessage;
+        Implement_interface_0: DiagnosticMessage;
+        Implement_inherited_abstract_class: DiagnosticMessage;
+        Add_0_to_unresolved_variable: DiagnosticMessage;
+        Remove_destructuring: DiagnosticMessage;
+        Remove_variable_statement: DiagnosticMessage;
+        Import_0_from_module_1: DiagnosticMessage;
+        Change_0_to_1: DiagnosticMessage;
+        Add_0_to_existing_import_declaration_from_1: DiagnosticMessage;
+        Declare_property_0: DiagnosticMessage;
+        Add_index_signature_for_property_0: DiagnosticMessage;
+        Disable_checking_for_this_file: DiagnosticMessage;
+        Ignore_this_error_message: DiagnosticMessage;
+        Initialize_property_0_in_the_constructor: DiagnosticMessage;
+        Initialize_static_property_0: DiagnosticMessage;
+        Change_spelling_to_0: DiagnosticMessage;
+        Declare_method_0: DiagnosticMessage;
+        Declare_static_method_0: DiagnosticMessage;
+        Prefix_0_with_an_underscore: DiagnosticMessage;
+        Rewrite_as_the_indexed_access_type_0: DiagnosticMessage;
+        Declare_static_property_0: DiagnosticMessage;
+        Call_decorator_expression: DiagnosticMessage;
+        Add_async_modifier_to_containing_function: DiagnosticMessage;
+        Convert_function_to_an_ES2015_class: DiagnosticMessage;
+        Convert_function_0_to_class: DiagnosticMessage;
+        Extract_to_0_in_1: DiagnosticMessage;
+        Extract_function: DiagnosticMessage;
+        Extract_constant: DiagnosticMessage;
+        Extract_to_0_in_enclosing_scope: DiagnosticMessage;
+        Extract_to_0_in_1_scope: DiagnosticMessage;
+        Annotate_with_type_from_JSDoc: DiagnosticMessage;
+        Annotate_with_types_from_JSDoc: DiagnosticMessage;
+        Infer_type_of_0_from_usage: DiagnosticMessage;
+        Infer_parameter_types_from_usage: DiagnosticMessage;
+        Convert_to_default_import: DiagnosticMessage;
+        Install_0: DiagnosticMessage;
+        Replace_import_with_0: DiagnosticMessage;
+        Use_synthetic_default_member: DiagnosticMessage;
+        Convert_to_ES6_module: DiagnosticMessage;
+        Add_undefined_type_to_property_0: DiagnosticMessage;
+        Add_initializer_to_property_0: DiagnosticMessage;
+        Add_definite_assignment_assertion_to_property_0: DiagnosticMessage;
+        Add_all_missing_members: DiagnosticMessage;
+        Infer_all_types_from_usage: DiagnosticMessage;
+        Delete_all_unused_declarations: DiagnosticMessage;
+        Prefix_all_unused_declarations_with_where_possible: DiagnosticMessage;
+        Fix_all_detected_spelling_errors: DiagnosticMessage;
+        Add_initializers_to_all_uninitialized_properties: DiagnosticMessage;
+        Add_definite_assignment_assertions_to_all_uninitialized_properties: DiagnosticMessage;
+        Add_undefined_type_to_all_uninitialized_properties: DiagnosticMessage;
+        Change_all_jsdoc_style_types_to_TypeScript: DiagnosticMessage;
+        Change_all_jsdoc_style_types_to_TypeScript_and_add_undefined_to_nullable_types: DiagnosticMessage;
+        Implement_all_unimplemented_interfaces: DiagnosticMessage;
+        Install_all_missing_types_packages: DiagnosticMessage;
+        Rewrite_all_as_indexed_access_types: DiagnosticMessage;
+        Convert_all_to_default_imports: DiagnosticMessage;
+        Make_all_super_calls_the_first_statement_in_their_constructor: DiagnosticMessage;
+        Add_qualifier_to_all_unresolved_variables_matching_a_member_name: DiagnosticMessage;
+        Change_all_extended_interfaces_to_implements: DiagnosticMessage;
+        Add_all_missing_super_calls: DiagnosticMessage;
+        Implement_all_inherited_abstract_classes: DiagnosticMessage;
+        Add_all_missing_async_modifiers: DiagnosticMessage;
+        Add_ts_ignore_to_all_error_messages: DiagnosticMessage;
+        Annotate_everything_with_types_from_JSDoc: DiagnosticMessage;
+        Add_to_all_uncalled_decorators: DiagnosticMessage;
+        Convert_all_constructor_functions_to_classes: DiagnosticMessage;
+        Generate_get_and_set_accessors: DiagnosticMessage;
+        Convert_require_to_import: DiagnosticMessage;
+        Convert_all_require_to_import: DiagnosticMessage;
+        Move_to_a_new_file: DiagnosticMessage;
+        Remove_unreachable_code: DiagnosticMessage;
+        Remove_all_unreachable_code: DiagnosticMessage;
+        Add_missing_typeof: DiagnosticMessage;
+        Remove_unused_label: DiagnosticMessage;
+        Remove_all_unused_labels: DiagnosticMessage;
+        Convert_0_to_mapped_object_type: DiagnosticMessage;
+        Convert_namespace_import_to_named_imports: DiagnosticMessage;
+        Convert_named_imports_to_namespace_import: DiagnosticMessage;
+    };
+}
+declare namespace ts {
+    type ErrorCallback = (message: DiagnosticMessage, length: number) => void;
+    function tokenIsIdentifierOrKeyword(token: SyntaxKind): boolean;
+    function tokenIsIdentifierOrKeywordOrGreaterThan(token: SyntaxKind): boolean;
+    interface Scanner {
+        getStartPos(): number;
+        getToken(): SyntaxKind;
+        getTextPos(): number;
+        getTokenPos(): number;
+        getTokenText(): string;
+        getTokenValue(): string;
+        hasExtendedUnicodeEscape(): boolean;
+        hasPrecedingLineBreak(): boolean;
+        isIdentifier(): boolean;
+        isReservedWord(): boolean;
+        isUnterminated(): boolean;
+        getTokenFlags(): TokenFlags;
+        reScanGreaterToken(): SyntaxKind;
+        reScanSlashToken(): SyntaxKind;
+        reScanTemplateToken(): SyntaxKind;
+        scanJsxIdentifier(): SyntaxKind;
+        scanJsxAttributeValue(): SyntaxKind;
+        reScanJsxToken(): JsxTokenSyntaxKind;
+        scanJsxToken(): JsxTokenSyntaxKind;
+        scanJSDocToken(): JsDocSyntaxKind;
+        scan(): SyntaxKind;
+        getText(): string;
+        setText(text: string | undefined, start?: number, length?: number): void;
+        setOnError(onError: ErrorCallback | undefined): void;
+        setScriptTarget(scriptTarget: ScriptTarget): void;
+        setLanguageVariant(variant: LanguageVariant): void;
+        setTextPos(textPos: number): void;
+        lookAhead<T>(callback: () => T): T;
+        scanRange<T>(start: number, length: number, callback: () => T): T;
+        tryScan<T>(callback: () => T): T;
+    }
+    function isUnicodeIdentifierStart(code: number, languageVersion: ScriptTarget | undefined): boolean;
+    function tokenToString(t: SyntaxKind): string | undefined;
+    function stringToToken(s: string): SyntaxKind | undefined;
+    function computeLineStarts(text: string): number[];
+    function getPositionOfLineAndCharacter(sourceFile: SourceFileLike, line: number, character: number): number;
+    function computePositionOfLineAndCharacter(lineStarts: ReadonlyArray<number>, line: number, character: number, debugText?: string): number;
+    function getLineStarts(sourceFile: SourceFileLike): ReadonlyArray<number>;
+    /**
+     * We assume the first line starts at position 0 and 'position' is non-negative.
+     */
+    function computeLineAndCharacterOfPosition(lineStarts: ReadonlyArray<number>, position: number): LineAndCharacter;
+    function getLineAndCharacterOfPosition(sourceFile: SourceFileLike, position: number): LineAndCharacter;
+    function isWhiteSpaceLike(ch: number): boolean;
+    /** Does not include line breaks. For that, see isWhiteSpaceLike. */
+    function isWhiteSpaceSingleLine(ch: number): boolean;
+    function isLineBreak(ch: number): boolean;
+    function isOctalDigit(ch: number): boolean;
+    function couldStartTrivia(text: string, pos: number): boolean;
+    function skipTrivia(text: string, pos: number, stopAfterLineBreak?: boolean, stopAtComments?: boolean): number;
+    function forEachLeadingCommentRange<U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean) => U): U | undefined;
+    function forEachLeadingCommentRange<T, U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean, state: T) => U, state: T): U | undefined;
+    function forEachTrailingCommentRange<U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean) => U): U | undefined;
+    function forEachTrailingCommentRange<T, U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean, state: T) => U, state: T): U | undefined;
+    function reduceEachLeadingCommentRange<T, U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean, state: T, memo: U) => U, state: T, initial: U): U | undefined;
+    function reduceEachTrailingCommentRange<T, U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean, state: T, memo: U) => U, state: T, initial: U): U | undefined;
+    function getLeadingCommentRanges(text: string, pos: number): CommentRange[] | undefined;
+    function getTrailingCommentRanges(text: string, pos: number): CommentRange[] | undefined;
+    /** Optionally, get the shebang */
+    function getShebang(text: string): string | undefined;
+    function isIdentifierStart(ch: number, languageVersion: ScriptTarget | undefined): boolean;
+    function isIdentifierPart(ch: number, languageVersion: ScriptTarget | undefined): boolean;
+    function isIdentifierText(name: string, languageVersion: ScriptTarget | undefined): boolean;
+    function createScanner(languageVersion: ScriptTarget, skipTrivia: boolean, languageVariant?: LanguageVariant, textInitial?: string, onError?: ErrorCallback, start?: number, length?: number): Scanner;
+}
+/** Non-internal stuff goes here */
+declare namespace ts {
+    const emptyArray: never[];
+    function closeFileWatcher(watcher: FileWatcher): void;
+    function isExternalModuleNameRelative(moduleName: string): boolean;
+    function sortAndDeduplicateDiagnostics<T extends Diagnostic>(diagnostics: ReadonlyArray<T>): T[];
+    function toPath(fileName: string, basePath: string | undefined, getCanonicalFileName: (path: string) => string): Path;
+    function hasEntries(map: ReadonlyUnderscoreEscapedMap<any> | undefined): map is ReadonlyUnderscoreEscapedMap<any>;
+}
+declare namespace ts {
+    const resolvingEmptyArray: never[];
+    const emptyMap: ReadonlyMap<never>;
+    const emptyUnderscoreEscapedMap: ReadonlyUnderscoreEscapedMap<never>;
+    const externalHelpersModuleNameText = "tslib";
+    function getDeclarationOfKind<T extends Declaration>(symbol: Symbol, kind: T["kind"]): T | undefined;
+    /** Create a new escaped identifier map. */
+    function createUnderscoreEscapedMap<T>(): UnderscoreEscapedMap<T>;
+    function createSymbolTable(symbols?: ReadonlyArray<Symbol>): SymbolTable;
+    function changesAffectModuleResolution(oldOptions: CompilerOptions, newOptions: CompilerOptions): boolean;
+    /**
+     * Iterates through the parent chain of a node and performs the callback on each parent until the callback
+     * returns a truthy value, then returns that value.
+     * If no such value is found, it applies the callback until the parent pointer is undefined or the callback returns "quit"
+     * At that point findAncestor returns undefined.
+     */
+    function findAncestor<T extends Node>(node: Node | undefined, callback: (element: Node) => element is T): T | undefined;
+    function findAncestor(node: Node | undefined, callback: (element: Node) => boolean | "quit"): Node | undefined;
+    /**
+     * Calls `callback` for each entry in the map, returning the first truthy result.
+     * Use `map.forEach` instead for normal iteration.
+     */
+    function forEachEntry<T, U>(map: ReadonlyUnderscoreEscapedMap<T>, callback: (value: T, key: __String) => U | undefined): U | undefined;
+    function forEachEntry<T, U>(map: ReadonlyMap<T>, callback: (value: T, key: string) => U | undefined): U | undefined;
+    /** `forEachEntry` for just keys. */
+    function forEachKey<T>(map: ReadonlyUnderscoreEscapedMap<{}>, callback: (key: __String) => T | undefined): T | undefined;
+    function forEachKey<T>(map: ReadonlyMap<{}>, callback: (key: string) => T | undefined): T | undefined;
+    /** Copy entries from `source` to `target`. */
+    function copyEntries<T>(source: ReadonlyUnderscoreEscapedMap<T>, target: UnderscoreEscapedMap<T>): void;
+    function copyEntries<T>(source: ReadonlyMap<T>, target: Map<T>): void;
+    /**
+     * Creates a set from the elements of an array.
+     *
+     * @param array the array of input elements.
+     */
+    function arrayToSet(array: ReadonlyArray<string>): Map<true>;
+    function arrayToSet<T>(array: ReadonlyArray<T>, makeKey: (value: T) => string | undefined): Map<true>;
+    function arrayToSet<T>(array: ReadonlyArray<T>, makeKey: (value: T) => __String | undefined): UnderscoreEscapedMap<true>;
+    function cloneMap(map: SymbolTable): SymbolTable;
+    function cloneMap<T>(map: ReadonlyMap<T>): Map<T>;
+    function cloneMap<T>(map: ReadonlyUnderscoreEscapedMap<T>): UnderscoreEscapedMap<T>;
+    function usingSingleLineStringWriter(action: (writer: EmitTextWriter) => void): string;
+    function getFullWidth(node: Node): number;
+    function getResolvedModule(sourceFile: SourceFile, moduleNameText: string): ResolvedModuleFull | undefined;
+    function setResolvedModule(sourceFile: SourceFile, moduleNameText: string, resolvedModule: ResolvedModuleFull): void;
+    function setResolvedTypeReferenceDirective(sourceFile: SourceFile, typeReferenceDirectiveName: string, resolvedTypeReferenceDirective: ResolvedTypeReferenceDirective): void;
+    function moduleResolutionIsEqualTo(oldResolution: ResolvedModuleFull, newResolution: ResolvedModuleFull): boolean;
+    function packageIdToString({ name, subModuleName, version }: PackageId): string;
+    function typeDirectiveIsEqualTo(oldResolution: ResolvedTypeReferenceDirective, newResolution: ResolvedTypeReferenceDirective): boolean;
+    function hasChangesInResolutions<T>(names: ReadonlyArray<string>, newResolutions: ReadonlyArray<T>, oldResolutions: ReadonlyMap<T> | undefined, comparer: (oldResolution: T, newResolution: T) => boolean): boolean;
+    function containsParseError(node: Node): boolean;
+    function getSourceFileOfNode(node: Node): SourceFile;
+    function getSourceFileOfNode(node: Node | undefined): SourceFile | undefined;
+    function isStatementWithLocals(node: Node): boolean;
+    function getStartPositionOfLine(line: number, sourceFile: SourceFileLike): number;
+    function nodePosToString(node: Node): string;
+    function getEndLinePosition(line: number, sourceFile: SourceFileLike): number;
+    /**
+     * Returns a value indicating whether a name is unique globally or within the current file.
+     * Note: This does not consider whether a name appears as a free identifier or not, so at the expression `x.y` this includes both `x` and `y`.
+     */
+    function isFileLevelUniqueName(sourceFile: SourceFile, name: string, hasGlobalName?: PrintHandlers["hasGlobalName"]): boolean;
+    function nodeIsMissing(node: Node | undefined): boolean;
+    function nodeIsPresent(node: Node | undefined): boolean;
+    /**
+     * Appends a range of value to begin of an array, returning the array.
+     *
+     * @param to The array to which `value` is to be appended. If `to` is `undefined`, a new array
+     * is created if `value` was appended.
+     * @param from The values to append to the array. If `from` is `undefined`, nothing is
+     * appended. If an element of `from` is `undefined`, that element is not appended.
+     */
+    function prependStatements<T extends Statement>(to: T[], from: ReadonlyArray<T> | undefined): T[] | undefined;
+    /**
+     * Determine if the given comment is a triple-slash
+     *
+     * @return true if the comment is a triple-slash comment else false
+     */
+    function isRecognizedTripleSlashComment(text: string, commentPos: number, commentEnd: number): boolean;
+    function isPinnedComment(text: string, start: number): boolean;
+    function getTokenPosOfNode(node: Node, sourceFile?: SourceFileLike, includeJsDoc?: boolean): number;
+    function getNonDecoratorTokenPosOfNode(node: Node, sourceFile?: SourceFileLike): number;
+    function getSourceTextOfNodeFromSourceFile(sourceFile: SourceFile, node: Node, includeTrivia?: boolean): string;
+    function getTextOfNodeFromSourceText(sourceText: string, node: Node, includeTrivia?: boolean): string;
+    function getTextOfNode(node: Node, includeTrivia?: boolean): string;
+    /**
+     * Note: it is expected that the `nodeArray` and the `node` are within the same file.
+     * For example, searching for a `SourceFile` in a `SourceFile[]` wouldn't work.
+     */
+    function indexOfNode(nodeArray: ReadonlyArray<Node>, node: Node): number;
+    /**
+     * Gets flags that control emit behavior of a node.
+     */
+    function getEmitFlags(node: Node): EmitFlags;
+    function getLiteralText(node: LiteralLikeNode, sourceFile: SourceFile): string;
+    function getTextOfConstantValue(value: string | number): string;
+    function escapeLeadingUnderscores(identifier: string): __String;
+    /**
+     * @deprecated Use `id.escapedText` to get the escaped text of an Identifier.
+     * @param identifier The identifier to escape
+     */
+    function escapeIdentifier(identifier: string): string;
+    function makeIdentifierFromModuleName(moduleName: string): string;
+    function isBlockOrCatchScoped(declaration: Declaration): boolean;
+    function isCatchClauseVariableDeclarationOrBindingElement(declaration: Declaration): boolean;
+    function isAmbientModule(node: Node): node is AmbientModuleDeclaration;
+    function isModuleWithStringLiteralName(node: Node): node is ModuleDeclaration;
+    function isNonGlobalAmbientModule(node: Node): node is ModuleDeclaration & {
+        name: StringLiteral;
+    };
+    /**
+     * An effective module (namespace) declaration is either
+     * 1. An actual declaration: namespace X { ... }
+     * 2. A Javascript declaration, which is:
+     *    An identifier in a nested property access expression: Y in `X.Y.Z = { ... }`
+     */
+    function isEffectiveModuleDeclaration(node: Node): boolean;
+    /** Given a symbol for a module, checks that it is a shorthand ambient module. */
+    function isShorthandAmbientModuleSymbol(moduleSymbol: Symbol): boolean;
+    function isBlockScopedContainerTopLevel(node: Node): boolean;
+    function isGlobalScopeAugmentation(module: ModuleDeclaration): boolean;
+    function isExternalModuleAugmentation(node: Node): node is AmbientModuleDeclaration;
+    function isModuleAugmentationExternal(node: AmbientModuleDeclaration): boolean;
+    function isEffectiveExternalModule(node: SourceFile, compilerOptions: CompilerOptions): boolean;
+    function isBlockScope(node: Node, parentNode: Node): boolean;
+    function isDeclarationWithTypeParameters(node: Node): node is DeclarationWithTypeParameters;
+    function isAnyImportSyntax(node: Node): node is AnyImportSyntax;
+    function isLateVisibilityPaintedStatement(node: Node): node is LateVisibilityPaintedStatement;
+    function isAnyImportOrReExport(node: Node): node is AnyImportOrReExport;
+    function getEnclosingBlockScopeContainer(node: Node): Node;
+    function declarationNameToString(name: DeclarationName | QualifiedName): string;
+    function getNameFromIndexInfo(info: IndexInfo): string | undefined;
+    function getTextOfPropertyName(name: PropertyName): __String;
+    function entityNameToString(name: EntityNameOrEntityNameExpression): string;
+    function createDiagnosticForNode(node: Node, message: DiagnosticMessage, arg0?: string | number, arg1?: string | number, arg2?: string | number, arg3?: string | number): DiagnosticWithLocation;
+    function createDiagnosticForNodeArray(sourceFile: SourceFile, nodes: NodeArray<Node>, message: DiagnosticMessage, arg0?: string | number, arg1?: string | number, arg2?: string | number, arg3?: string | number): Diagnostic;
+    function createDiagnosticForNodeInSourceFile(sourceFile: SourceFile, node: Node, message: DiagnosticMessage, arg0?: string | number, arg1?: string | number, arg2?: string | number, arg3?: string | number): DiagnosticWithLocation;
+    function createDiagnosticForNodeFromMessageChain(node: Node, messageChain: DiagnosticMessageChain): DiagnosticWithLocation;
+    function getSpanOfTokenAtPosition(sourceFile: SourceFile, pos: number): TextSpan;
+    function getErrorSpanForNode(sourceFile: SourceFile, node: Node): TextSpan;
+    function isExternalOrCommonJsModule(file: SourceFile): boolean;
+    function isJsonSourceFile(file: SourceFile): file is JsonSourceFile;
+    function isConstEnumDeclaration(node: Node): boolean;
+    function isConst(node: Node): boolean;
+    function isLet(node: Node): boolean;
+    function isSuperCall(n: Node): n is SuperCall;
+    function isImportCall(n: Node): n is ImportCall;
+    function isLiteralImportTypeNode(n: Node): n is LiteralImportTypeNode;
+    function isPrologueDirective(node: Node): node is PrologueDirective;
+    function getLeadingCommentRangesOfNode(node: Node, sourceFileOfNode: SourceFile): CommentRange[] | undefined;
+    function getJSDocCommentRanges(node: Node, text: string): CommentRange[] | undefined;
+    const fullTripleSlashReferencePathRegEx: RegExp;
+    const fullTripleSlashAMDReferencePathRegEx: RegExp;
+    function isPartOfTypeNode(node: Node): boolean;
+    function isChildOfNodeWithKind(node: Node, kind: SyntaxKind): boolean;
+    function forEachReturnStatement<T>(body: Block, visitor: (stmt: ReturnStatement) => T): T | undefined;
+    function forEachYieldExpression(body: Block, visitor: (expr: YieldExpression) => void): void;
+    /**
+     * Gets the most likely element type for a TypeNode. This is not an exhaustive test
+     * as it assumes a rest argument can only be an array type (either T[], or Array<T>).
+     *
+     * @param node The type node.
+     */
+    function getRestParameterElementType(node: TypeNode | undefined): TypeNode | undefined;
+    function getMembersOfDeclaration(node: Declaration): NodeArray<ClassElement | TypeElement | ObjectLiteralElement> | undefined;
+    function isVariableLike(node: Node): node is VariableLikeDeclaration;
+    function isVariableLikeOrAccessor(node: Node): node is AccessorDeclaration | VariableLikeDeclaration;
+    function isVariableDeclarationInVariableStatement(node: VariableDeclaration): boolean;
+    function isValidESSymbolDeclaration(node: Node): node is VariableDeclaration | PropertyDeclaration | SignatureDeclaration;
+    function introducesArgumentsExoticObject(node: Node): boolean;
+    function unwrapInnermostStatementOfLabel(node: LabeledStatement, beforeUnwrapLabelCallback?: (node: LabeledStatement) => void): Statement;
+    function isFunctionBlock(node: Node): boolean;
+    function isObjectLiteralMethod(node: Node): node is MethodDeclaration;
+    function isObjectLiteralOrClassExpressionMethod(node: Node): node is MethodDeclaration;
+    function isIdentifierTypePredicate(predicate: TypePredicate): predicate is IdentifierTypePredicate;
+    function isThisTypePredicate(predicate: TypePredicate): predicate is ThisTypePredicate;
+    function getPropertyAssignment(objectLiteral: ObjectLiteralExpression, key: string, key2?: string): ReadonlyArray<PropertyAssignment>;
+    function getTsConfigObjectLiteralExpression(tsConfigSourceFile: TsConfigSourceFile | undefined): ObjectLiteralExpression | undefined;
+    function getTsConfigPropArrayElementValue(tsConfigSourceFile: TsConfigSourceFile | undefined, propKey: string, elementValue: string): StringLiteral | undefined;
+    function getTsConfigPropArray(tsConfigSourceFile: TsConfigSourceFile | undefined, propKey: string): ReadonlyArray<PropertyAssignment>;
+    function getContainingFunction(node: Node): SignatureDeclaration | undefined;
+    function getContainingClass(node: Node): ClassLikeDeclaration | undefined;
+    function getThisContainer(node: Node, includeArrowFunctions: boolean): Node;
+    function getNewTargetContainer(node: Node): Node | undefined;
+    /**
+     * Given an super call/property node, returns the closest node where
+     * - a super call/property access is legal in the node and not legal in the parent node the node.
+     *   i.e. super call is legal in constructor but not legal in the class body.
+     * - the container is an arrow function (so caller might need to call getSuperContainer again in case it needs to climb higher)
+     * - a super call/property is definitely illegal in the container (but might be legal in some subnode)
+     *   i.e. super property access is illegal in function declaration but can be legal in the statement list
+     */
+    function getSuperContainer(node: Node, stopOnFunctions: boolean): Node;
+    function getImmediatelyInvokedFunctionExpression(func: Node): CallExpression | undefined;
+    /**
+     * Determines whether a node is a property or element access expression for `super`.
+     */
+    function isSuperProperty(node: Node): node is SuperProperty;
+    /**
+     * Determines whether a node is a property or element access expression for `this`.
+     */
+    function isThisProperty(node: Node): boolean;
+    function getEntityNameFromTypeNode(node: TypeNode): EntityNameOrEntityNameExpression | undefined;
+    function getInvokedExpression(node: CallLikeExpression): Expression;
+    function nodeCanBeDecorated(node: ClassDeclaration): true;
+    function nodeCanBeDecorated(node: ClassElement, parent: Node): boolean;
+    function nodeCanBeDecorated(node: Node, parent: Node, grandparent: Node): boolean;
+    function nodeIsDecorated(node: ClassDeclaration): boolean;
+    function nodeIsDecorated(node: ClassElement, parent: Node): boolean;
+    function nodeIsDecorated(node: Node, parent: Node, grandparent: Node): boolean;
+    function nodeOrChildIsDecorated(node: ClassDeclaration): boolean;
+    function nodeOrChildIsDecorated(node: ClassElement, parent: Node): boolean;
+    function nodeOrChildIsDecorated(node: Node, parent: Node, grandparent: Node): boolean;
+    function childIsDecorated(node: ClassDeclaration): boolean;
+    function childIsDecorated(node: Node, parent: Node): boolean;
+    function isJSXTagName(node: Node): boolean;
+    function isExpressionNode(node: Node): boolean;
+    function isInExpressionContext(node: Node): boolean;
+    function isExternalModuleImportEqualsDeclaration(node: Node): boolean;
+    function getExternalModuleImportEqualsDeclarationExpression(node: Node): Expression;
+    function isInternalModuleImportEqualsDeclaration(node: Node): node is ImportEqualsDeclaration;
+    function isSourceFileJavaScript(file: SourceFile): boolean;
+    function isSourceFileNotJavaScript(file: SourceFile): boolean;
+    function isInJavaScriptFile(node: Node | undefined): boolean;
+    function isInJsonFile(node: Node | undefined): boolean;
+    function isInJSDoc(node: Node | undefined): boolean;
+    function isJSDocIndexSignature(node: TypeReferenceNode | ExpressionWithTypeArguments): boolean | undefined;
+    /**
+     * Returns true if the node is a CallExpression to the identifier 'require' with
+     * exactly one argument (of the form 'require("name")').
+     * This function does not test if the node is in a JavaScript file or not.
+     */
+    function isRequireCall(callExpression: Node, checkArgumentIsStringLiteralLike: true): callExpression is RequireOrImportCall & {
+        expression: Identifier;
+        arguments: [StringLiteralLike];
+    };
+    function isRequireCall(callExpression: Node, checkArgumentIsStringLiteralLike: boolean): callExpression is CallExpression;
+    function isSingleOrDoubleQuote(charCode: number): boolean;
+    function isStringDoubleQuoted(str: StringLiteralLike, sourceFile: SourceFile): boolean;
+    function getDeclarationOfJSInitializer(node: Node): Node | undefined;
+    /** Get the initializer, taking into account defaulted Javascript initializers */
+    function getEffectiveInitializer(node: HasExpressionInitializer): Expression | undefined;
+    /**
+     * Get the assignment 'initializer' -- the righthand side-- when the initializer is container-like (See getJavascriptInitializer).
+     * We treat the right hand side of assignments with container-like initalizers as declarations.
+     */
+    function getAssignedJavascriptInitializer(node: Node): Expression | undefined;
+    /**
+     * Recognized Javascript container-like initializers are:
+     * 1. (function() {})() -- IIFEs
+     * 2. function() { } -- Function expressions
+     * 3. class { } -- Class expressions
+     * 4. {} -- Empty object literals
+     * 5. { ... } -- Non-empty object literals, when used to initialize a prototype, like `C.prototype = { m() { } }`
+     *
+     * This function returns the provided initializer, or undefined if it is not valid.
+     */
+    function getJavascriptInitializer(initializer: Node, isPrototypeAssignment: boolean): Expression | undefined;
+    function isDefaultedJavascriptInitializer(node: BinaryExpression): boolean | undefined;
+    /** Given a Javascript initializer, return the outer name. That is, the lhs of the assignment or the declaration name. */
+    function getOuterNameOfJsInitializer(node: Declaration): DeclarationName | undefined;
+    function getRightMostAssignedExpression(node: Expression): Expression;
+    function isExportsIdentifier(node: Node): boolean;
+    function isModuleExportsPropertyAccessExpression(node: Node): boolean;
+    function getSpecialPropertyAssignmentKind(expr: BinaryExpression): SpecialPropertyAssignmentKind;
+    function getInitializerOfBinaryExpression(expr: BinaryExpression): Expression;
+    function isPrototypePropertyAssignment(node: Node): boolean;
+    function isSpecialPropertyDeclaration(expr: PropertyAccessExpression): boolean;
+    function importFromModuleSpecifier(node: StringLiteralLike): AnyValidImportOrReExport;
+    function tryGetImportFromModuleSpecifier(node: StringLiteralLike): AnyValidImportOrReExport | undefined;
+    function getExternalModuleName(node: AnyImportOrReExport | ImportTypeNode): Expression | undefined;
+    function getNamespaceDeclarationNode(node: ImportDeclaration | ImportEqualsDeclaration | ExportDeclaration): ImportEqualsDeclaration | NamespaceImport | undefined;
+    function isDefaultImport(node: ImportDeclaration | ImportEqualsDeclaration | ExportDeclaration): boolean;
+    function hasQuestionToken(node: Node): boolean;
+    function isJSDocConstructSignature(node: Node): boolean;
+    function isJSDocTypeAlias(node: Node): node is JSDocTypedefTag | JSDocCallbackTag;
+    function isTypeAlias(node: Node): node is JSDocTypedefTag | JSDocCallbackTag | TypeAliasDeclaration;
+    function getJSDocCommentsAndTags(hostNode: Node): ReadonlyArray<JSDoc | JSDocTag>;
+    /** Does the opposite of `getJSDocParameterTags`: given a JSDoc parameter, finds the parameter corresponding to it. */
+    function getParameterSymbolFromJSDoc(node: JSDocParameterTag): Symbol | undefined;
+    function getHostSignatureFromJSDoc(node: Node): SignatureDeclaration | undefined;
+    function getHostSignatureFromJSDocHost(host: HasJSDoc): SignatureDeclaration | undefined;
+    function getJSDocHost(node: Node): HasJSDoc;
+    function getTypeParameterFromJsDoc(node: TypeParameterDeclaration & {
+        parent: JSDocTemplateTag;
+    }): TypeParameterDeclaration | undefined;
+    function hasRestParameter(s: SignatureDeclaration | JSDocSignature): boolean;
+    function isRestParameter(node: ParameterDeclaration | JSDocParameterTag): boolean;
+    enum AssignmentKind {
+        None = 0,
+        Definite = 1,
+        Compound = 2
+    }
+    function getAssignmentTargetKind(node: Node): AssignmentKind;
+    function isAssignmentTarget(node: Node): boolean;
+    type NodeWithPossibleHoistedDeclaration = Block | VariableStatement | WithStatement | IfStatement | SwitchStatement | CaseBlock | CaseClause | DefaultClause | LabeledStatement | ForStatement | ForInStatement | ForOfStatement | DoStatement | WhileStatement | TryStatement | CatchClause;
+    /**
+     * Indicates whether a node could contain a `var` VariableDeclarationList that contributes to
+     * the same `var` declaration scope as the node's parent.
+     */
+    function isNodeWithPossibleHoistedDeclaration(node: Node): node is NodeWithPossibleHoistedDeclaration;
+    type ValueSignatureDeclaration = FunctionDeclaration | MethodDeclaration | ConstructorDeclaration | AccessorDeclaration | FunctionExpression | ArrowFunction;
+    function isValueSignatureDeclaration(node: Node): node is ValueSignatureDeclaration;
+    function walkUpParenthesizedTypes(node: Node): Node;
+    function walkUpParenthesizedExpressions(node: Node): Node;
+    function skipParentheses(node: Expression): Expression;
+    function skipParentheses(node: Node): Node;
+    function isDeleteTarget(node: Node): boolean;
+    function isNodeDescendantOf(node: Node, ancestor: Node): boolean;
+    function isDeclarationName(name: Node): boolean;
+    function isAnyDeclarationName(name: Node): boolean;
+    function isLiteralComputedPropertyDeclarationName(node: Node): boolean;
+    function isIdentifierName(node: Identifier): boolean;
+    function isAliasSymbolDeclaration(node: Node): boolean;
+    function exportAssignmentIsAlias(node: ExportAssignment | BinaryExpression): boolean;
+    function getClassExtendsHeritageClauseElement(node: ClassLikeDeclaration | InterfaceDeclaration): ExpressionWithTypeArguments | undefined;
+    function getClassImplementsHeritageClauseElements(node: ClassLikeDeclaration): NodeArray<ExpressionWithTypeArguments> | undefined;
+    /** Returns the node in an `extends` or `implements` clause of a class or interface. */
+    function getAllSuperTypeNodes(node: Node): ReadonlyArray<TypeNode>;
+    function getInterfaceBaseTypeNodes(node: InterfaceDeclaration): NodeArray<ExpressionWithTypeArguments> | undefined;
+    function getHeritageClause(clauses: NodeArray<HeritageClause> | undefined, kind: SyntaxKind): HeritageClause | undefined;
+    function tryResolveScriptReference(host: ScriptReferenceHost, sourceFile: SourceFile, reference: FileReference): SourceFile | undefined;
+    function getAncestor(node: Node | undefined, kind: SyntaxKind): Node | undefined;
+    function isKeyword(token: SyntaxKind): boolean;
+    function isContextualKeyword(token: SyntaxKind): boolean;
+    function isNonContextualKeyword(token: SyntaxKind): boolean;
+    function isStringANonContextualKeyword(name: string): boolean;
+    type TriviaKind = SyntaxKind.SingleLineCommentTrivia | SyntaxKind.MultiLineCommentTrivia | SyntaxKind.NewLineTrivia | SyntaxKind.WhitespaceTrivia | SyntaxKind.ShebangTrivia | SyntaxKind.ConflictMarkerTrivia;
+    function isTrivia(token: SyntaxKind): token is TriviaKind;
+    enum FunctionFlags {
+        Normal = 0,
+        Generator = 1,
+        Async = 2,
+        Invalid = 4,
+        AsyncGenerator = 3
+    }
+    function getFunctionFlags(node: SignatureDeclaration | undefined): FunctionFlags;
+    function isAsyncFunction(node: Node): boolean;
+    function isStringOrNumericLiteral(node: Node): node is StringLiteral | NumericLiteral;
+    /**
+     * A declaration has a dynamic name if both of the following are true:
+     *   1. The declaration has a computed property name
+     *   2. The computed name is *not* expressed as Symbol.<name>, where name
+     *      is a property of the Symbol constructor that denotes a built in
+     *      Symbol.
+     */
+    function hasDynamicName(declaration: Declaration): declaration is DynamicNamedDeclaration;
+    function isDynamicName(name: DeclarationName): boolean;
+    /**
+     * Checks if the expression is of the form:
+     *    Symbol.name
+     * where Symbol is literally the word "Symbol", and name is any identifierName
+     */
+    function isWellKnownSymbolSyntactically(node: Expression): boolean;
+    function getPropertyNameForPropertyNameNode(name: DeclarationName): __String | undefined;
+    type PropertyNameLiteral = Identifier | StringLiteralLike | NumericLiteral;
+    function isPropertyNameLiteral(node: Node): node is PropertyNameLiteral;
+    function getTextOfIdentifierOrLiteral(node: PropertyNameLiteral): string;
+    function getEscapedTextOfIdentifierOrLiteral(node: PropertyNameLiteral): __String;
+    function getPropertyNameForKnownSymbolName(symbolName: string): __String;
+    function isKnownSymbol(symbol: Symbol): boolean;
+    /**
+     * Includes the word "Symbol" with unicode escapes
+     */
+    function isESSymbolIdentifier(node: Node): boolean;
+    function isPushOrUnshiftIdentifier(node: Identifier): boolean;
+    function isParameterDeclaration(node: VariableLikeDeclaration): boolean;
+    function getRootDeclaration(node: Node): Node;
+    function nodeStartsNewLexicalEnvironment(node: Node): boolean;
+    function nodeIsSynthesized(range: TextRange): boolean;
+    function getOriginalSourceFile(sourceFile: SourceFile): SourceFile;
+    enum Associativity {
+        Left = 0,
+        Right = 1
+    }
+    function getExpressionAssociativity(expression: Expression): Associativity;
+    function getOperatorAssociativity(kind: SyntaxKind, operator: SyntaxKind, hasArguments?: boolean): Associativity;
+    function getExpressionPrecedence(expression: Expression): number;
+    function getOperator(expression: Expression): SyntaxKind.Unknown | SyntaxKind.EndOfFileToken | SyntaxKind.SingleLineCommentTrivia | SyntaxKind.MultiLineCommentTrivia | SyntaxKind.NewLineTrivia | SyntaxKind.WhitespaceTrivia | SyntaxKind.ShebangTrivia | SyntaxKind.ConflictMarkerTrivia | SyntaxKind.NumericLiteral | SyntaxKind.StringLiteral | SyntaxKind.JsxText | SyntaxKind.JsxTextAllWhiteSpaces | SyntaxKind.RegularExpressionLiteral | SyntaxKind.NoSubstitutionTemplateLiteral | SyntaxKind.TemplateHead | SyntaxKind.TemplateMiddle | SyntaxKind.TemplateTail | SyntaxKind.OpenBraceToken | SyntaxKind.CloseBraceToken | SyntaxKind.OpenParenToken | SyntaxKind.CloseParenToken | SyntaxKind.OpenBracketToken | SyntaxKind.CloseBracketToken | SyntaxKind.DotToken | SyntaxKind.DotDotDotToken | SyntaxKind.SemicolonToken | SyntaxKind.CommaToken | SyntaxKind.LessThanToken | SyntaxKind.LessThanSlashToken | SyntaxKind.GreaterThanToken | SyntaxKind.LessThanEqualsToken | SyntaxKind.GreaterThanEqualsToken | SyntaxKind.EqualsEqualsToken | SyntaxKind.ExclamationEqualsToken | SyntaxKind.EqualsEqualsEqualsToken | SyntaxKind.ExclamationEqualsEqualsToken | SyntaxKind.EqualsGreaterThanToken | SyntaxKind.PlusToken | SyntaxKind.MinusToken | SyntaxKind.AsteriskToken | SyntaxKind.AsteriskAsteriskToken | SyntaxKind.SlashToken | SyntaxKind.PercentToken | SyntaxKind.PlusPlusToken | SyntaxKind.MinusMinusToken | SyntaxKind.LessThanLessThanToken | SyntaxKind.GreaterThanGreaterThanToken | SyntaxKind.GreaterThanGreaterThanGreaterThanToken | SyntaxKind.AmpersandToken | SyntaxKind.BarToken | SyntaxKind.CaretToken | SyntaxKind.ExclamationToken | SyntaxKind.TildeToken | SyntaxKind.AmpersandAmpersandToken | SyntaxKind.BarBarToken | SyntaxKind.QuestionToken | SyntaxKind.ColonToken | SyntaxKind.AtToken | SyntaxKind.EqualsToken | SyntaxKind.PlusEqualsToken | SyntaxKind.MinusEqualsToken | SyntaxKind.AsteriskEqualsToken | SyntaxKind.AsteriskAsteriskEqualsToken | SyntaxKind.SlashEqualsToken | SyntaxKind.PercentEqualsToken | SyntaxKind.LessThanLessThanEqualsToken | SyntaxKind.GreaterThanGreaterThanEqualsToken | SyntaxKind.GreaterThanGreaterThanGreaterThanEqualsToken | SyntaxKind.AmpersandEqualsToken | SyntaxKind.BarEqualsToken | SyntaxKind.CaretEqualsToken | SyntaxKind.Identifier | SyntaxKind.BreakKeyword | SyntaxKind.CaseKeyword | SyntaxKind.CatchKeyword | SyntaxKind.ClassKeyword | SyntaxKind.ConstKeyword | SyntaxKind.ContinueKeyword | SyntaxKind.DebuggerKeyword | SyntaxKind.DefaultKeyword | SyntaxKind.DeleteKeyword | SyntaxKind.DoKeyword | SyntaxKind.ElseKeyword | SyntaxKind.EnumKeyword | SyntaxKind.ExportKeyword | SyntaxKind.ExtendsKeyword | SyntaxKind.FalseKeyword | SyntaxKind.FinallyKeyword | SyntaxKind.ForKeyword | SyntaxKind.FunctionKeyword | SyntaxKind.IfKeyword | SyntaxKind.ImportKeyword | SyntaxKind.InKeyword | SyntaxKind.InstanceOfKeyword | SyntaxKind.NewKeyword | SyntaxKind.NullKeyword | SyntaxKind.ReturnKeyword | SyntaxKind.SuperKeyword | SyntaxKind.SwitchKeyword | SyntaxKind.ThisKeyword | SyntaxKind.ThrowKeyword | SyntaxKind.TrueKeyword | SyntaxKind.TryKeyword | SyntaxKind.TypeOfKeyword | SyntaxKind.VarKeyword | SyntaxKind.VoidKeyword | SyntaxKind.WhileKeyword | SyntaxKind.WithKeyword | SyntaxKind.ImplementsKeyword | SyntaxKind.InterfaceKeyword | SyntaxKind.LetKeyword | SyntaxKind.PackageKeyword | SyntaxKind.PrivateKeyword | SyntaxKind.ProtectedKeyword | SyntaxKind.PublicKeyword | SyntaxKind.StaticKeyword | SyntaxKind.YieldKeyword | SyntaxKind.AbstractKeyword | SyntaxKind.AsKeyword | SyntaxKind.AnyKeyword | SyntaxKind.AsyncKeyword | SyntaxKind.AwaitKeyword | SyntaxKind.BooleanKeyword | SyntaxKind.ConstructorKeyword | SyntaxKind.DeclareKeyword | SyntaxKind.GetKeyword | SyntaxKind.InferKeyword | SyntaxKind.IsKeyword | SyntaxKind.KeyOfKeyword | SyntaxKind.ModuleKeyword | SyntaxKind.NamespaceKeyword | SyntaxKind.NeverKeyword | SyntaxKind.ReadonlyKeyword | SyntaxKind.RequireKeyword | SyntaxKind.NumberKeyword | SyntaxKind.ObjectKeyword | SyntaxKind.SetKeyword | SyntaxKind.StringKeyword | SyntaxKind.SymbolKeyword | SyntaxKind.TypeKeyword | SyntaxKind.UndefinedKeyword | SyntaxKind.UniqueKeyword | SyntaxKind.UnknownKeyword | SyntaxKind.FromKeyword | SyntaxKind.GlobalKeyword | SyntaxKind.OfKeyword | SyntaxKind.QualifiedName | SyntaxKind.ComputedPropertyName | SyntaxKind.TypeParameter | SyntaxKind.Parameter | SyntaxKind.Decorator | SyntaxKind.PropertySignature | SyntaxKind.PropertyDeclaration | SyntaxKind.MethodSignature | SyntaxKind.MethodDeclaration | SyntaxKind.Constructor | SyntaxKind.GetAccessor | SyntaxKind.SetAccessor | SyntaxKind.CallSignature | SyntaxKind.ConstructSignature | SyntaxKind.IndexSignature | SyntaxKind.TypePredicate | SyntaxKind.TypeReference | SyntaxKind.FunctionType | SyntaxKind.ConstructorType | SyntaxKind.TypeQuery | SyntaxKind.TypeLiteral | SyntaxKind.ArrayType | SyntaxKind.TupleType | SyntaxKind.UnionType | SyntaxKind.IntersectionType | SyntaxKind.ConditionalType | SyntaxKind.InferType | SyntaxKind.ParenthesizedType | SyntaxKind.ThisType | SyntaxKind.TypeOperator | SyntaxKind.IndexedAccessType | SyntaxKind.MappedType | SyntaxKind.LiteralType | SyntaxKind.ImportType | SyntaxKind.ObjectBindingPattern | SyntaxKind.ArrayBindingPattern | SyntaxKind.BindingElement | SyntaxKind.ArrayLiteralExpression | SyntaxKind.ObjectLiteralExpression | SyntaxKind.PropertyAccessExpression | SyntaxKind.ElementAccessExpression | SyntaxKind.CallExpression | SyntaxKind.NewExpression | SyntaxKind.TaggedTemplateExpression | SyntaxKind.TypeAssertionExpression | SyntaxKind.ParenthesizedExpression | SyntaxKind.FunctionExpression | SyntaxKind.ArrowFunction | SyntaxKind.DeleteExpression | SyntaxKind.TypeOfExpression | SyntaxKind.VoidExpression | SyntaxKind.AwaitExpression | SyntaxKind.ConditionalExpression | SyntaxKind.TemplateExpression | SyntaxKind.YieldExpression | SyntaxKind.SpreadElement | SyntaxKind.ClassExpression | SyntaxKind.OmittedExpression | SyntaxKind.ExpressionWithTypeArguments | SyntaxKind.AsExpression | SyntaxKind.NonNullExpression | SyntaxKind.MetaProperty | SyntaxKind.TemplateSpan | SyntaxKind.SemicolonClassElement | SyntaxKind.Block | SyntaxKind.VariableStatement | SyntaxKind.EmptyStatement | SyntaxKind.ExpressionStatement | SyntaxKind.IfStatement | SyntaxKind.DoStatement | SyntaxKind.WhileStatement | SyntaxKind.ForStatement | SyntaxKind.ForInStatement | SyntaxKind.ForOfStatement | SyntaxKind.ContinueStatement | SyntaxKind.BreakStatement | SyntaxKind.ReturnStatement | SyntaxKind.WithStatement | SyntaxKind.SwitchStatement | SyntaxKind.LabeledStatement | SyntaxKind.ThrowStatement | SyntaxKind.TryStatement | SyntaxKind.DebuggerStatement | SyntaxKind.VariableDeclaration | SyntaxKind.VariableDeclarationList | SyntaxKind.FunctionDeclaration | SyntaxKind.ClassDeclaration | SyntaxKind.InterfaceDeclaration | SyntaxKind.TypeAliasDeclaration | SyntaxKind.EnumDeclaration | SyntaxKind.ModuleDeclaration | SyntaxKind.ModuleBlock | SyntaxKind.CaseBlock | SyntaxKind.NamespaceExportDeclaration | SyntaxKind.ImportEqualsDeclaration | SyntaxKind.ImportDeclaration | SyntaxKind.ImportClause | SyntaxKind.NamespaceImport | SyntaxKind.NamedImports | SyntaxKind.ImportSpecifier | SyntaxKind.ExportAssignment | SyntaxKind.ExportDeclaration | SyntaxKind.NamedExports | SyntaxKind.ExportSpecifier | SyntaxKind.MissingDeclaration | SyntaxKind.ExternalModuleReference | SyntaxKind.JsxElement | SyntaxKind.JsxSelfClosingElement | SyntaxKind.JsxOpeningElement | SyntaxKind.JsxClosingElement | SyntaxKind.JsxFragment | SyntaxKind.JsxOpeningFragment | SyntaxKind.JsxClosingFragment | SyntaxKind.JsxAttribute | SyntaxKind.JsxAttributes | SyntaxKind.JsxSpreadAttribute | SyntaxKind.JsxExpression | SyntaxKind.CaseClause | SyntaxKind.DefaultClause | SyntaxKind.HeritageClause | SyntaxKind.CatchClause | SyntaxKind.PropertyAssignment | SyntaxKind.ShorthandPropertyAssignment | SyntaxKind.SpreadAssignment | SyntaxKind.EnumMember | SyntaxKind.SourceFile | SyntaxKind.Bundle | SyntaxKind.UnparsedSource | SyntaxKind.InputFiles | SyntaxKind.JSDocTypeExpression | SyntaxKind.JSDocAllType | SyntaxKind.JSDocUnknownType | SyntaxKind.JSDocNullableType | SyntaxKind.JSDocNonNullableType | SyntaxKind.JSDocOptionalType | SyntaxKind.JSDocFunctionType | SyntaxKind.JSDocVariadicType | SyntaxKind.JSDocComment | SyntaxKind.JSDocTypeLiteral | SyntaxKind.JSDocSignature | SyntaxKind.JSDocTag | SyntaxKind.JSDocAugmentsTag | SyntaxKind.JSDocClassTag | SyntaxKind.JSDocCallbackTag | SyntaxKind.JSDocParameterTag | SyntaxKind.JSDocReturnTag | SyntaxKind.JSDocTypeTag | SyntaxKind.JSDocTemplateTag | SyntaxKind.JSDocTypedefTag | SyntaxKind.JSDocPropertyTag | SyntaxKind.SyntaxList | SyntaxKind.NotEmittedStatement | SyntaxKind.PartiallyEmittedExpression | SyntaxKind.CommaListExpression | SyntaxKind.MergeDeclarationMarker | SyntaxKind.EndOfDeclarationMarker | SyntaxKind.Count;
+    function getOperatorPrecedence(nodeKind: SyntaxKind, operatorKind: SyntaxKind, hasArguments?: boolean): number;
+    function getBinaryOperatorPrecedence(kind: SyntaxKind): number;
+    function createDiagnosticCollection(): DiagnosticCollection;
+    /**
+     * Based heavily on the abstract 'Quote'/'QuoteJSONString' operation from ECMA-262 (24.3.2.2),
+     * but augmented for a few select characters (e.g. lineSeparator, paragraphSeparator, nextLine)
+     * Note that this doesn't actually wrap the input in double quotes.
+     */
+    function escapeString(s: string, quoteChar?: CharacterCodes.doubleQuote | CharacterCodes.singleQuote | CharacterCodes.backtick): string;
+    function isIntrinsicJsxName(name: __String | string): boolean;
+    function escapeNonAsciiString(s: string, quoteChar?: CharacterCodes.doubleQuote | CharacterCodes.singleQuote | CharacterCodes.backtick): string;
+    function getIndentString(level: number): string;
+    function getIndentSize(): number;
+    function createTextWriter(newLine: string): EmitTextWriter;
+    function getResolvedExternalModuleName(host: EmitHost, file: SourceFile, referenceFile?: SourceFile): string;
+    function getExternalModuleNameFromDeclaration(host: EmitHost, resolver: EmitResolver, declaration: ImportEqualsDeclaration | ImportDeclaration | ExportDeclaration | ModuleDeclaration | ImportTypeNode): string | undefined;
+    /**
+     * Resolves a local path to a path which is absolute to the base of the emit
+     */
+    function getExternalModuleNameFromPath(host: EmitHost, fileName: string, referencePath?: string): string;
+    function getOwnEmitOutputFilePath(sourceFile: SourceFile, host: EmitHost, extension: string): string;
+    function getDeclarationEmitOutputFilePath(sourceFile: SourceFile, host: EmitHost): string;
+    interface EmitFileNames {
+        jsFilePath: string;
+        sourceMapFilePath: string | undefined;
+        declarationFilePath: string | undefined;
+        declarationMapPath: string | undefined;
+        bundleInfoPath: string | undefined;
+    }
+    /**
+     * Gets the source files that are expected to have an emit output.
+     *
+     * Originally part of `forEachExpectedEmitFile`, this functionality was extracted to support
+     * transformations.
+     *
+     * @param host An EmitHost.
+     * @param targetSourceFile An optional target source file to emit.
+     */
+    function getSourceFilesToEmit(host: EmitHost, targetSourceFile?: SourceFile): ReadonlyArray<SourceFile>;
+    /** Don't call this for `--outFile`, just for `--outDir` or plain emit. `--outFile` needs additional checks. */
+    function sourceFileMayBeEmitted(sourceFile: SourceFile, options: CompilerOptions, isSourceFileFromExternalLibrary: (file: SourceFile) => boolean): boolean;
+    function getSourceFilePathInNewDir(sourceFile: SourceFile, host: EmitHost, newDirPath: string): string;
+    function writeFile(host: EmitHost, diagnostics: DiagnosticCollection, fileName: string, data: string, writeByteOrderMark: boolean, sourceFiles?: ReadonlyArray<SourceFile>): void;
+    function getLineOfLocalPosition(currentSourceFile: SourceFile, pos: number): number;
+    function getLineOfLocalPositionFromLineMap(lineMap: ReadonlyArray<number>, pos: number): number;
+    function getFirstConstructorWithBody(node: ClassLikeDeclaration): ConstructorDeclaration | undefined;
+    /** Get the type annotation for the value parameter. */
+    function getSetAccessorTypeAnnotationNode(accessor: SetAccessorDeclaration): TypeNode | undefined;
+    function getThisParameter(signature: SignatureDeclaration | JSDocSignature): ParameterDeclaration | undefined;
+    function parameterIsThisKeyword(parameter: ParameterDeclaration): boolean;
+    function isThisIdentifier(node: Node | undefined): boolean;
+    function identifierIsThisKeyword(id: Identifier): boolean;
+    function getAllAccessorDeclarations(declarations: NodeArray<Declaration>, accessor: AccessorDeclaration): AllAccessorDeclarations;
+    /**
+     * Gets the effective type annotation of a variable, parameter, or property. If the node was
+     * parsed in a JavaScript file, gets the type annotation from JSDoc.
+     */
+    function getEffectiveTypeAnnotationNode(node: Node): TypeNode | undefined;
+    function getTypeAnnotationNode(node: Node): TypeNode | undefined;
+    /**
+     * Gets the effective return type annotation of a signature. If the node was parsed in a
+     * JavaScript file, gets the return type annotation from JSDoc.
+     */
+    function getEffectiveReturnTypeNode(node: SignatureDeclaration | JSDocSignature): TypeNode | undefined;
+    /**
+     * Gets the effective type parameters. If the node was parsed in a
+     * JavaScript file, gets the type parameters from the `@template` tag from JSDoc.
+     */
+    function getEffectiveTypeParameterDeclarations(node: DeclarationWithTypeParameters): ReadonlyArray<TypeParameterDeclaration>;
+    function getJSDocTypeParameterDeclarations(node: DeclarationWithTypeParameters): ReadonlyArray<TypeParameterDeclaration>;
+    /**
+     * Gets the effective type annotation of the value parameter of a set accessor. If the node
+     * was parsed in a JavaScript file, gets the type annotation from JSDoc.
+     */
+    function getEffectiveSetAccessorTypeAnnotationNode(node: SetAccessorDeclaration): TypeNode | undefined;
+    function emitNewLineBeforeLeadingComments(lineMap: ReadonlyArray<number>, writer: EmitTextWriter, node: TextRange, leadingComments: ReadonlyArray<CommentRange> | undefined): void;
+    function emitNewLineBeforeLeadingCommentsOfPosition(lineMap: ReadonlyArray<number>, writer: EmitTextWriter, pos: number, leadingComments: ReadonlyArray<CommentRange> | undefined): void;
+    function emitNewLineBeforeLeadingCommentOfPosition(lineMap: ReadonlyArray<number>, writer: EmitTextWriter, pos: number, commentPos: number): void;
+    function emitComments(text: string, lineMap: ReadonlyArray<number>, writer: EmitTextWriter, comments: ReadonlyArray<CommentRange> | undefined, leadingSeparator: boolean, trailingSeparator: boolean, newLine: string, writeComment: (text: string, lineMap: ReadonlyArray<number>, writer: EmitTextWriter, commentPos: number, commentEnd: number, newLine: string) => void): void;
+    /**
+     * Detached comment is a comment at the top of file or function body that is separated from
+     * the next statement by space.
+     */
+    function emitDetachedComments(text: string, lineMap: ReadonlyArray<number>, writer: EmitTextWriter, writeComment: (text: string, lineMap: ReadonlyArray<number>, writer: EmitTextWriter, commentPos: number, commentEnd: number, newLine: string) => void, node: TextRange, newLine: string, removeComments: boolean): {
+        nodePos: number;
+        detachedCommentEndPos: number;
+    } | undefined;
+    function writeCommentRange(text: string, lineMap: ReadonlyArray<number>, writer: EmitTextWriter, commentPos: number, commentEnd: number, newLine: string): void;
+    function hasModifiers(node: Node): boolean;
+    function hasModifier(node: Node, flags: ModifierFlags): boolean;
+    function hasStaticModifier(node: Node): boolean;
+    function hasReadonlyModifier(node: Node): boolean;
+    function getSelectedModifierFlags(node: Node, flags: ModifierFlags): ModifierFlags;
+    function getModifierFlags(node: Node): ModifierFlags;
+    function getModifierFlagsNoCache(node: Node): ModifierFlags;
+    function modifierToFlag(token: SyntaxKind): ModifierFlags;
+    function isLogicalOperator(token: SyntaxKind): boolean;
+    function isAssignmentOperator(token: SyntaxKind): boolean;
+    /** Get `C` given `N` if `N` is in the position `class C extends N` where `N` is an ExpressionWithTypeArguments. */
+    function tryGetClassExtendingExpressionWithTypeArguments(node: Node): ClassLikeDeclaration | undefined;
+    function isAssignmentExpression(node: Node, excludeCompoundAssignment: true): node is AssignmentExpression<EqualsToken>;
+    function isAssignmentExpression(node: Node, excludeCompoundAssignment?: false): node is AssignmentExpression<AssignmentOperatorToken>;
+    function isDestructuringAssignment(node: Node): node is DestructuringAssignment;
+    function isExpressionWithTypeArgumentsInClassExtendsClause(node: Node): boolean;
+    function isExpressionWithTypeArgumentsInClassImplementsClause(node: Node): node is ExpressionWithTypeArguments;
+    function isEntityNameExpression(node: Node): node is EntityNameExpression;
+    function isPropertyAccessEntityNameExpression(node: Node): node is PropertyAccessEntityNameExpression;
+    function isPrototypeAccess(node: Node): node is PropertyAccessExpression;
+    function isRightSideOfQualifiedNameOrPropertyAccess(node: Node): boolean;
+    function isEmptyObjectLiteral(expression: Node): boolean;
+    function isEmptyArrayLiteral(expression: Node): boolean;
+    function getLocalSymbolForExportDefault(symbol: Symbol): Symbol | undefined;
+    /** Return ".ts", ".d.ts", or ".tsx", if that is the extension. */
+    function tryExtractTypeScriptExtension(fileName: string): string | undefined;
+    /**
+     * Converts a string to a base-64 encoded ASCII string.
+     */
+    function convertToBase64(input: string): string;
+    function base64encode(host: {
+        base64encode?(input: string): string;
+    } | undefined, input: string): string;
+    function base64decode(host: {
+        base64decode?(input: string): string;
+    } | undefined, input: string): string;
+    function getNewLineCharacter(options: CompilerOptions | PrinterOptions, getNewLine?: () => string): string;
+    function formatSyntaxKind(kind: SyntaxKind | undefined): string;
+    function formatModifierFlags(flags: ModifierFlags | undefined): string;
+    function formatTransformFlags(flags: TransformFlags | undefined): string;
+    function formatEmitFlags(flags: EmitFlags | undefined): string;
+    function formatSymbolFlags(flags: SymbolFlags | undefined): string;
+    function formatTypeFlags(flags: TypeFlags | undefined): string;
+    function formatObjectFlags(flags: ObjectFlags | undefined): string;
+    /**
+     * Creates a new TextRange from the provided pos and end.
+     *
+     * @param pos The start position.
+     * @param end The end position.
+     */
+    function createRange(pos: number, end: number): TextRange;
+    /**
+     * Creates a new TextRange from a provided range with a new end position.
+     *
+     * @param range A TextRange.
+     * @param end The new end position.
+     */
+    function moveRangeEnd(range: TextRange, end: number): TextRange;
+    /**
+     * Creates a new TextRange from a provided range with a new start position.
+     *
+     * @param range A TextRange.
+     * @param pos The new Start position.
+     */
+    function moveRangePos(range: TextRange, pos: number): TextRange;
+    /**
+     * Moves the start position of a range past any decorators.
+     */
+    function moveRangePastDecorators(node: Node): TextRange;
+    /**
+     * Moves the start position of a range past any decorators or modifiers.
+     */
+    function moveRangePastModifiers(node: Node): TextRange;
+    /**
+     * Determines whether a TextRange has the same start and end positions.
+     *
+     * @param range A TextRange.
+     */
+    function isCollapsedRange(range: TextRange): boolean;
+    /**
+     * Creates a new TextRange for a token at the provides start position.
+     *
+     * @param pos The start position.
+     * @param token The token.
+     */
+    function createTokenRange(pos: number, token: SyntaxKind): TextRange;
+    function rangeIsOnSingleLine(range: TextRange, sourceFile: SourceFile): boolean;
+    function rangeStartPositionsAreOnSameLine(range1: TextRange, range2: TextRange, sourceFile: SourceFile): boolean;
+    function rangeEndPositionsAreOnSameLine(range1: TextRange, range2: TextRange, sourceFile: SourceFile): boolean;
+    function rangeStartIsOnSameLineAsRangeEnd(range1: TextRange, range2: TextRange, sourceFile: SourceFile): boolean;
+    function rangeEndIsOnSameLineAsRangeStart(range1: TextRange, range2: TextRange, sourceFile: SourceFile): boolean;
+    function positionsAreOnSameLine(pos1: number, pos2: number, sourceFile: SourceFile): boolean;
+    function getStartPositionOfRange(range: TextRange, sourceFile: SourceFile): number;
+    /**
+     * Determines whether a name was originally the declaration name of an enum or namespace
+     * declaration.
+     */
+    function isDeclarationNameOfEnumOrNamespace(node: Identifier): boolean;
+    function getInitializedVariables(node: VariableDeclarationList): ReadonlyArray<VariableDeclaration>;
+    function isWatchSet(options: CompilerOptions): boolean | undefined;
+    function getCheckFlags(symbol: Symbol): CheckFlags;
+    function getDeclarationModifierFlagsFromSymbol(s: Symbol): ModifierFlags;
+    function skipAlias(symbol: Symbol, checker: TypeChecker): Symbol;
+    /** See comment on `declareModuleMember` in `binder.ts`. */
+    function getCombinedLocalAndExportSymbolFlags(symbol: Symbol): SymbolFlags;
+    function isWriteOnlyAccess(node: Node): boolean;
+    function isWriteAccess(node: Node): boolean;
+    function compareDataObjects(dst: any, src: any): boolean;
+    /**
+     * clears already present map by calling onDeleteExistingValue callback before deleting that key/value
+     */
+    function clearMap<T>(map: Map<T>, onDeleteValue: (valueInMap: T, key: string) => void): void;
+    interface MutateMapOptions<T, U> {
+        createNewValue(key: string, valueInNewMap: U): T;
+        onDeleteValue(existingValue: T, key: string): void;
+        /**
+         * If present this is called with the key when there is value for that key both in new map as well as existing map provided
+         * Caller can then decide to update or remove this key.
+         * If the key is removed, caller will get callback of createNewValue for that key.
+         * If this callback is not provided, the value of such keys is not updated.
+         */
+        onExistingValue?(existingValue: T, valueInNewMap: U, key: string): void;
+    }
+    /**
+     * Mutates the map with newMap such that keys in map will be same as newMap.
+     */
+    function mutateMap<T, U>(map: Map<T>, newMap: ReadonlyMap<U>, options: MutateMapOptions<T, U>): void;
+    /** Calls `callback` on `directory` and every ancestor directory it has, returning the first defined result. */
+    function forEachAncestorDirectory<T>(directory: string, callback: (directory: string) => T | undefined): T | undefined;
+    function isAbstractConstructorType(type: Type): boolean;
+    function isAbstractConstructorSymbol(symbol: Symbol): boolean;
+    function getClassLikeDeclarationOfSymbol(symbol: Symbol): ClassLikeDeclaration | undefined;
+    function getObjectFlags(type: Type): ObjectFlags;
+    function typeHasCallOrConstructSignatures(type: Type, checker: TypeChecker): boolean;
+    function forSomeAncestorDirectory(directory: string, callback: (directory: string) => boolean): boolean;
+    function isUMDExportSymbol(symbol: Symbol | undefined): boolean | undefined;
+    function showModuleSpecifier({ moduleSpecifier }: ImportDeclaration): string;
+    function getLastChild(node: Node): Node | undefined;
+    /** Add a value to a set, and return true if it wasn't already present. */
+    function addToSeen(seen: Map<true>, key: string | number): boolean;
+    function addToSeen<T>(seen: Map<T>, key: string | number, value: T): boolean;
+    function isObjectTypeDeclaration(node: Node): node is ObjectTypeDeclaration;
+}
+declare namespace ts {
+    function getDefaultLibFileName(options: CompilerOptions): string;
+    function textSpanEnd(span: TextSpan): number;
+    function textSpanIsEmpty(span: TextSpan): boolean;
+    function textSpanContainsPosition(span: TextSpan, position: number): boolean;
+    function textSpanContainsTextSpan(span: TextSpan, other: TextSpan): boolean;
+    function textSpanOverlapsWith(span: TextSpan, other: TextSpan): boolean;
+    function textSpanOverlap(span1: TextSpan, span2: TextSpan): TextSpan | undefined;
+    function textSpanIntersectsWithTextSpan(span: TextSpan, other: TextSpan): boolean;
+    function textSpanIntersectsWith(span: TextSpan, start: number, length: number): boolean;
+    function decodedTextSpanIntersectsWith(start1: number, length1: number, start2: number, length2: number): boolean;
+    function textSpanIntersectsWithPosition(span: TextSpan, position: number): boolean;
+    function textSpanIntersection(span1: TextSpan, span2: TextSpan): TextSpan | undefined;
+    function createTextSpan(start: number, length: number): TextSpan;
+    function createTextRange(pos: number, end?: number): TextRange;
+    function createTextSpanFromBounds(start: number, end: number): TextSpan;
+    function textChangeRangeNewSpan(range: TextChangeRange): TextSpan;
+    function textChangeRangeIsUnchanged(range: TextChangeRange): boolean;
+    function createTextChangeRange(span: TextSpan, newLength: number): TextChangeRange;
+    let unchangedTextChangeRange: TextChangeRange;
+    /**
+     * Called to merge all the changes that occurred across several versions of a script snapshot
+     * into a single change.  i.e. if a user keeps making successive edits to a script we will
+     * have a text change from V1 to V2, V2 to V3, ..., Vn.
+     *
+     * This function will then merge those changes into a single change range valid between V1 and
+     * Vn.
+     */
+    function collapseTextChangeRangesAcrossMultipleVersions(changes: ReadonlyArray<TextChangeRange>): TextChangeRange;
+    function getTypeParameterOwner(d: Declaration): Declaration | undefined;
+    type ParameterPropertyDeclaration = ParameterDeclaration & {
+        parent: ConstructorDeclaration;
+        name: Identifier;
+    };
+    function isParameterPropertyDeclaration(node: Node): node is ParameterPropertyDeclaration;
+    function isEmptyBindingPattern(node: BindingName): node is BindingPattern;
+    function isEmptyBindingElement(node: BindingElement): boolean;
+    function getCombinedModifierFlags(node: Node): ModifierFlags;
+    function getCombinedNodeFlags(node: Node): NodeFlags;
+    /**
+     * Checks to see if the locale is in the appropriate format,
+     * and if it is, attempts to set the appropriate language.
+     */
+    function validateLocaleAndSetLanguage(locale: string, sys: {
+        getExecutingFilePath(): string;
+        resolvePath(path: string): string;
+        fileExists(fileName: string): boolean;
+        readFile(fileName: string): string | undefined;
+    }, errors?: Push<Diagnostic>): void;
+    function getOriginalNode(node: Node): Node;
+    function getOriginalNode<T extends Node>(node: Node, nodeTest: (node: Node) => node is T): T;
+    function getOriginalNode(node: Node | undefined): Node | undefined;
+    function getOriginalNode<T extends Node>(node: Node | undefined, nodeTest: (node: Node | undefined) => node is T): T | undefined;
+    /**
+     * Gets a value indicating whether a node originated in the parse tree.
+     *
+     * @param node The node to test.
+     */
+    function isParseTreeNode(node: Node): boolean;
+    /**
+     * Gets the original parse tree node for a node.
+     *
+     * @param node The original node.
+     * @returns The original parse tree node if found; otherwise, undefined.
+     */
+    function getParseTreeNode(node: Node): Node;
+    /**
+     * Gets the original parse tree node for a node.
+     *
+     * @param node The original node.
+     * @param nodeTest A callback used to ensure the correct type of parse tree node is returned.
+     * @returns The original parse tree node if found; otherwise, undefined.
+     */
+    function getParseTreeNode<T extends Node>(node: Node | undefined, nodeTest?: (node: Node) => node is T): T | undefined;
+    /**
+     * Remove extra underscore from escaped identifier text content.
+     *
+     * @param identifier The escaped identifier text.
+     * @returns The unescaped identifier text.
+     */
+    function unescapeLeadingUnderscores(identifier: __String): string;
+    function idText(identifier: Identifier): string;
+    function symbolName(symbol: Symbol): string;
+    /**
+     * Remove extra underscore from escaped identifier text content.
+     * @deprecated Use `id.text` for the unescaped text.
+     * @param identifier The escaped identifier text.
+     * @returns The unescaped identifier text.
+     */
+    function unescapeIdentifier(id: string): string;
+    function getNameOfJSDocTypedef(declaration: JSDocTypedefTag): Identifier | undefined;
+    /** @internal */
+    function isNamedDeclaration(node: Node): node is NamedDeclaration & {
+        name: DeclarationName;
+    };
+    function getNameOfDeclaration(declaration: Declaration | Expression): DeclarationName;
+    /**
+     * Gets the JSDoc parameter tags for the node if present.
+     *
+     * @remarks Returns any JSDoc param tag that matches the provided
+     * parameter, whether a param tag on a containing function
+     * expression, or a param tag on a variable declaration whose
+     * initializer is the containing function. The tags closest to the
+     * node are returned first, so in the previous example, the param
+     * tag on the containing function expression would be first.
+     *
+     * Does not return tags for binding patterns, because JSDoc matches
+     * parameters by name and binding patterns do not have a name.
+     */
+    function getJSDocParameterTags(param: ParameterDeclaration): ReadonlyArray<JSDocParameterTag>;
+    /**
+     * Return true if the node has JSDoc parameter tags.
+     *
+     * @remarks Includes parameter tags that are not directly on the node,
+     * for example on a variable declaration whose initializer is a function expression.
+     */
+    function hasJSDocParameterTags(node: FunctionLikeDeclaration | SignatureDeclaration): boolean;
+    /** Gets the JSDoc augments tag for the node if present */
+    function getJSDocAugmentsTag(node: Node): JSDocAugmentsTag | undefined;
+    /** Gets the JSDoc class tag for the node if present */
+    function getJSDocClassTag(node: Node): JSDocClassTag | undefined;
+    /** Gets the JSDoc return tag for the node if present */
+    function getJSDocReturnTag(node: Node): JSDocReturnTag | undefined;
+    /** Gets the JSDoc template tag for the node if present */
+    function getJSDocTemplateTag(node: Node): JSDocTemplateTag | undefined;
+    /** Gets the JSDoc type tag for the node if present and valid */
+    function getJSDocTypeTag(node: Node): JSDocTypeTag | undefined;
+    /**
+     * Gets the type node for the node if provided via JSDoc.
+     *
+     * @remarks The search includes any JSDoc param tag that relates
+     * to the provided parameter, for example a type tag on the
+     * parameter itself, or a param tag on a containing function
+     * expression, or a param tag on a variable declaration whose
+     * initializer is the containing function. The tags closest to the
+     * node are examined first, so in the previous example, the type
+     * tag directly on the node would be returned.
+     */
+    function getJSDocType(node: Node): TypeNode | undefined;
+    /**
+     * Gets the return type node for the node if provided via JSDoc's return tag.
+     *
+     * @remarks `getJSDocReturnTag` just gets the whole JSDoc tag. This function
+     * gets the type from inside the braces.
+     */
+    function getJSDocReturnType(node: Node): TypeNode | undefined;
+    /** Get all JSDoc tags related to a node, including those on parent nodes. */
+    function getJSDocTags(node: Node): ReadonlyArray<JSDocTag>;
+    /** Gets all JSDoc tags of a specified kind, or undefined if not present. */
+    function getAllJSDocTagsOfKind(node: Node, kind: SyntaxKind): ReadonlyArray<JSDocTag>;
+}
+declare namespace ts {
+    function isNumericLiteral(node: Node): node is NumericLiteral;
+    function isStringLiteral(node: Node): node is StringLiteral;
+    function isJsxText(node: Node): node is JsxText;
+    function isRegularExpressionLiteral(node: Node): node is RegularExpressionLiteral;
+    function isNoSubstitutionTemplateLiteral(node: Node): node is NoSubstitutionTemplateLiteral;
+    function isTemplateHead(node: Node): node is TemplateHead;
+    function isTemplateMiddle(node: Node): node is TemplateMiddle;
+    function isTemplateTail(node: Node): node is TemplateTail;
+    function isIdentifier(node: Node): node is Identifier;
+    function isQualifiedName(node: Node): node is QualifiedName;
+    function isComputedPropertyName(node: Node): node is ComputedPropertyName;
+    function isTypeParameterDeclaration(node: Node): node is TypeParameterDeclaration;
+    function isParameter(node: Node): node is ParameterDeclaration;
+    function isDecorator(node: Node): node is Decorator;
+    function isPropertySignature(node: Node): node is PropertySignature;
+    function isPropertyDeclaration(node: Node): node is PropertyDeclaration;
+    function isMethodSignature(node: Node): node is MethodSignature;
+    function isMethodDeclaration(node: Node): node is MethodDeclaration;
+    function isConstructorDeclaration(node: Node): node is ConstructorDeclaration;
+    function isGetAccessorDeclaration(node: Node): node is GetAccessorDeclaration;
+    function isSetAccessorDeclaration(node: Node): node is SetAccessorDeclaration;
+    function isCallSignatureDeclaration(node: Node): node is CallSignatureDeclaration;
+    function isConstructSignatureDeclaration(node: Node): node is ConstructSignatureDeclaration;
+    function isIndexSignatureDeclaration(node: Node): node is IndexSignatureDeclaration;
+    function isGetOrSetAccessorDeclaration(node: Node): node is AccessorDeclaration;
+    function isTypePredicateNode(node: Node): node is TypePredicateNode;
+    function isTypeReferenceNode(node: Node): node is TypeReferenceNode;
+    function isFunctionTypeNode(node: Node): node is FunctionTypeNode;
+    function isConstructorTypeNode(node: Node): node is ConstructorTypeNode;
+    function isTypeQueryNode(node: Node): node is TypeQueryNode;
+    function isTypeLiteralNode(node: Node): node is TypeLiteralNode;
+    function isArrayTypeNode(node: Node): node is ArrayTypeNode;
+    function isTupleTypeNode(node: Node): node is TupleTypeNode;
+    function isUnionTypeNode(node: Node): node is UnionTypeNode;
+    function isIntersectionTypeNode(node: Node): node is IntersectionTypeNode;
+    function isConditionalTypeNode(node: Node): node is ConditionalTypeNode;
+    function isInferTypeNode(node: Node): node is InferTypeNode;
+    function isParenthesizedTypeNode(node: Node): node is ParenthesizedTypeNode;
+    function isThisTypeNode(node: Node): node is ThisTypeNode;
+    function isTypeOperatorNode(node: Node): node is TypeOperatorNode;
+    function isIndexedAccessTypeNode(node: Node): node is IndexedAccessTypeNode;
+    function isMappedTypeNode(node: Node): node is MappedTypeNode;
+    function isLiteralTypeNode(node: Node): node is LiteralTypeNode;
+    function isImportTypeNode(node: Node): node is ImportTypeNode;
+    function isObjectBindingPattern(node: Node): node is ObjectBindingPattern;
+    function isArrayBindingPattern(node: Node): node is ArrayBindingPattern;
+    function isBindingElement(node: Node): node is BindingElement;
+    function isArrayLiteralExpression(node: Node): node is ArrayLiteralExpression;
+    function isObjectLiteralExpression(node: Node): node is ObjectLiteralExpression;
+    function isPropertyAccessExpression(node: Node): node is PropertyAccessExpression;
+    function isElementAccessExpression(node: Node): node is ElementAccessExpression;
+    function isCallExpression(node: Node): node is CallExpression;
+    function isNewExpression(node: Node): node is NewExpression;
+    function isTaggedTemplateExpression(node: Node): node is TaggedTemplateExpression;
+    function isTypeAssertion(node: Node): node is TypeAssertion;
+    function isParenthesizedExpression(node: Node): node is ParenthesizedExpression;
+    function skipPartiallyEmittedExpressions(node: Expression): Expression;
+    function skipPartiallyEmittedExpressions(node: Node): Node;
+    function isFunctionExpression(node: Node): node is FunctionExpression;
+    function isArrowFunction(node: Node): node is ArrowFunction;
+    function isDeleteExpression(node: Node): node is DeleteExpression;
+    function isTypeOfExpression(node: Node): node is TypeOfExpression;
+    function isVoidExpression(node: Node): node is VoidExpression;
+    function isAwaitExpression(node: Node): node is AwaitExpression;
+    function isPrefixUnaryExpression(node: Node): node is PrefixUnaryExpression;
+    function isPostfixUnaryExpression(node: Node): node is PostfixUnaryExpression;
+    function isBinaryExpression(node: Node): node is BinaryExpression;
+    function isConditionalExpression(node: Node): node is ConditionalExpression;
+    function isTemplateExpression(node: Node): node is TemplateExpression;
+    function isYieldExpression(node: Node): node is YieldExpression;
+    function isSpreadElement(node: Node): node is SpreadElement;
+    function isClassExpression(node: Node): node is ClassExpression;
+    function isOmittedExpression(node: Node): node is OmittedExpression;
+    function isExpressionWithTypeArguments(node: Node): node is ExpressionWithTypeArguments;
+    function isAsExpression(node: Node): node is AsExpression;
+    function isNonNullExpression(node: Node): node is NonNullExpression;
+    function isMetaProperty(node: Node): node is MetaProperty;
+    function isTemplateSpan(node: Node): node is TemplateSpan;
+    function isSemicolonClassElement(node: Node): node is SemicolonClassElement;
+    function isBlock(node: Node): node is Block;
+    function isVariableStatement(node: Node): node is VariableStatement;
+    function isEmptyStatement(node: Node): node is EmptyStatement;
+    function isExpressionStatement(node: Node): node is ExpressionStatement;
+    function isIfStatement(node: Node): node is IfStatement;
+    function isDoStatement(node: Node): node is DoStatement;
+    function isWhileStatement(node: Node): node is WhileStatement;
+    function isForStatement(node: Node): node is ForStatement;
+    function isForInStatement(node: Node): node is ForInStatement;
+    function isForOfStatement(node: Node): node is ForOfStatement;
+    function isContinueStatement(node: Node): node is ContinueStatement;
+    function isBreakStatement(node: Node): node is BreakStatement;
+    function isBreakOrContinueStatement(node: Node): node is BreakOrContinueStatement;
+    function isReturnStatement(node: Node): node is ReturnStatement;
+    function isWithStatement(node: Node): node is WithStatement;
+    function isSwitchStatement(node: Node): node is SwitchStatement;
+    function isLabeledStatement(node: Node): node is LabeledStatement;
+    function isThrowStatement(node: Node): node is ThrowStatement;
+    function isTryStatement(node: Node): node is TryStatement;
+    function isDebuggerStatement(node: Node): node is DebuggerStatement;
+    function isVariableDeclaration(node: Node): node is VariableDeclaration;
+    function isVariableDeclarationList(node: Node): node is VariableDeclarationList;
+    function isFunctionDeclaration(node: Node): node is FunctionDeclaration;
+    function isClassDeclaration(node: Node): node is ClassDeclaration;
+    function isInterfaceDeclaration(node: Node): node is InterfaceDeclaration;
+    function isTypeAliasDeclaration(node: Node): node is TypeAliasDeclaration;
+    function isEnumDeclaration(node: Node): node is EnumDeclaration;
+    function isModuleDeclaration(node: Node): node is ModuleDeclaration;
+    function isModuleBlock(node: Node): node is ModuleBlock;
+    function isCaseBlock(node: Node): node is CaseBlock;
+    function isNamespaceExportDeclaration(node: Node): node is NamespaceExportDeclaration;
+    function isImportEqualsDeclaration(node: Node): node is ImportEqualsDeclaration;
+    function isImportDeclaration(node: Node): node is ImportDeclaration;
+    function isImportClause(node: Node): node is ImportClause;
+    function isNamespaceImport(node: Node): node is NamespaceImport;
+    function isNamedImports(node: Node): node is NamedImports;
+    function isImportSpecifier(node: Node): node is ImportSpecifier;
+    function isExportAssignment(node: Node): node is ExportAssignment;
+    function isExportDeclaration(node: Node): node is ExportDeclaration;
+    function isNamedExports(node: Node): node is NamedExports;
+    function isExportSpecifier(node: Node): node is ExportSpecifier;
+    function isMissingDeclaration(node: Node): node is MissingDeclaration;
+    function isExternalModuleReference(node: Node): node is ExternalModuleReference;
+    function isJsxElement(node: Node): node is JsxElement;
+    function isJsxSelfClosingElement(node: Node): node is JsxSelfClosingElement;
+    function isJsxOpeningElement(node: Node): node is JsxOpeningElement;
+    function isJsxClosingElement(node: Node): node is JsxClosingElement;
+    function isJsxFragment(node: Node): node is JsxFragment;
+    function isJsxOpeningFragment(node: Node): node is JsxOpeningFragment;
+    function isJsxClosingFragment(node: Node): node is JsxClosingFragment;
+    function isJsxAttribute(node: Node): node is JsxAttribute;
+    function isJsxAttributes(node: Node): node is JsxAttributes;
+    function isJsxSpreadAttribute(node: Node): node is JsxSpreadAttribute;
+    function isJsxExpression(node: Node): node is JsxExpression;
+    function isCaseClause(node: Node): node is CaseClause;
+    function isDefaultClause(node: Node): node is DefaultClause;
+    function isHeritageClause(node: Node): node is HeritageClause;
+    function isCatchClause(node: Node): node is CatchClause;
+    function isPropertyAssignment(node: Node): node is PropertyAssignment;
+    function isShorthandPropertyAssignment(node: Node): node is ShorthandPropertyAssignment;
+    function isSpreadAssignment(node: Node): node is SpreadAssignment;
+    function isEnumMember(node: Node): node is EnumMember;
+    function isSourceFile(node: Node): node is SourceFile;
+    function isBundle(node: Node): node is Bundle;
+    function isUnparsedSource(node: Node): node is UnparsedSource;
+    function isJSDocTypeExpression(node: Node): node is JSDocTypeExpression;
+    function isJSDocAllType(node: JSDocAllType): node is JSDocAllType;
+    function isJSDocUnknownType(node: Node): node is JSDocUnknownType;
+    function isJSDocNullableType(node: Node): node is JSDocNullableType;
+    function isJSDocNonNullableType(node: Node): node is JSDocNonNullableType;
+    function isJSDocOptionalType(node: Node): node is JSDocOptionalType;
+    function isJSDocFunctionType(node: Node): node is JSDocFunctionType;
+    function isJSDocVariadicType(node: Node): node is JSDocVariadicType;
+    function isJSDoc(node: Node): node is JSDoc;
+    function isJSDocAugmentsTag(node: Node): node is JSDocAugmentsTag;
+    function isJSDocClassTag(node: Node): node is JSDocClassTag;
+    function isJSDocParameterTag(node: Node): node is JSDocParameterTag;
+    function isJSDocReturnTag(node: Node): node is JSDocReturnTag;
+    function isJSDocTypeTag(node: Node): node is JSDocTypeTag;
+    function isJSDocTemplateTag(node: Node): node is JSDocTemplateTag;
+    function isJSDocTypedefTag(node: Node): node is JSDocTypedefTag;
+    function isJSDocPropertyTag(node: Node): node is JSDocPropertyTag;
+    function isJSDocPropertyLikeTag(node: Node): node is JSDocPropertyLikeTag;
+    function isJSDocTypeLiteral(node: Node): node is JSDocTypeLiteral;
+    function isJSDocCallbackTag(node: Node): node is JSDocCallbackTag;
+    function isJSDocSignature(node: Node): node is JSDocSignature;
+}
+declare namespace ts {
+    function isSyntaxList(n: Node): n is SyntaxList;
+    function isNode(node: Node): boolean;
+    function isNodeKind(kind: SyntaxKind): boolean;
+    /**
+     * True if node is of some token syntax kind.
+     * For example, this is true for an IfKeyword but not for an IfStatement.
+     * Literals are considered tokens, except TemplateLiteral, but does include TemplateHead/Middle/Tail.
+     */
+    function isToken(n: Node): boolean;
+    function isNodeArray<T extends Node>(array: ReadonlyArray<T>): array is NodeArray<T>;
+    function isLiteralKind(kind: SyntaxKind): boolean;
+    function isLiteralExpression(node: Node): node is LiteralExpression;
+    function isTemplateLiteralKind(kind: SyntaxKind): boolean;
+    type TemplateLiteralToken = NoSubstitutionTemplateLiteral | TemplateHead | TemplateMiddle | TemplateTail;
+    function isTemplateLiteralToken(node: Node): node is TemplateLiteralToken;
+    function isTemplateMiddleOrTemplateTail(node: Node): node is TemplateMiddle | TemplateTail;
+    function isStringTextContainingNode(node: Node): node is StringLiteral | TemplateLiteralToken;
+    function isGeneratedIdentifier(node: Node): node is GeneratedIdentifier;
+    function isModifierKind(token: SyntaxKind): boolean;
+    function isParameterPropertyModifier(kind: SyntaxKind): boolean;
+    function isClassMemberModifier(idToken: SyntaxKind): boolean;
+    function isModifier(node: Node): node is Modifier;
+    function isEntityName(node: Node): node is EntityName;
+    function isPropertyName(node: Node): node is PropertyName;
+    function isBindingName(node: Node): node is BindingName;
+    function isFunctionLike(node: Node): node is SignatureDeclaration;
+    function isFunctionLikeDeclaration(node: Node): node is FunctionLikeDeclaration;
+    function isFunctionLikeKind(kind: SyntaxKind): boolean;
+    function isFunctionOrModuleBlock(node: Node): boolean;
+    function isClassElement(node: Node): node is ClassElement;
+    function isClassLike(node: Node): node is ClassLikeDeclaration;
+    function isAccessor(node: Node): node is AccessorDeclaration;
+    function isMethodOrAccessor(node: Node): node is MethodDeclaration | AccessorDeclaration;
+    function isTypeElement(node: Node): node is TypeElement;
+    function isClassOrTypeElement(node: Node): node is ClassElement | TypeElement;
+    function isObjectLiteralElementLike(node: Node): node is ObjectLiteralElementLike;
+    /**
+     * Node test that determines whether a node is a valid type node.
+     * This differs from the `isPartOfTypeNode` function which determines whether a node is *part*
+     * of a TypeNode.
+     */
+    function isTypeNode(node: Node): node is TypeNode;
+    function isFunctionOrConstructorTypeNode(node: Node): node is FunctionTypeNode | ConstructorTypeNode;
+    function isBindingPattern(node: Node | undefined): node is BindingPattern;
+    function isAssignmentPattern(node: Node): node is AssignmentPattern;
+    function isArrayBindingElement(node: Node): node is ArrayBindingElement;
+    /**
+     * Determines whether the BindingOrAssignmentElement is a BindingElement-like declaration
+     */
+    function isDeclarationBindingElement(bindingElement: BindingOrAssignmentElement): bindingElement is VariableDeclaration | ParameterDeclaration | BindingElement;
+    /**
+     * Determines whether a node is a BindingOrAssignmentPattern
+     */
+    function isBindingOrAssignmentPattern(node: BindingOrAssignmentElementTarget): node is BindingOrAssignmentPattern;
+    /**
+     * Determines whether a node is an ObjectBindingOrAssignmentPattern
+     */
+    function isObjectBindingOrAssignmentPattern(node: BindingOrAssignmentElementTarget): node is ObjectBindingOrAssignmentPattern;
+    /**
+     * Determines whether a node is an ArrayBindingOrAssignmentPattern
+     */
+    function isArrayBindingOrAssignmentPattern(node: BindingOrAssignmentElementTarget): node is ArrayBindingOrAssignmentPattern;
+    function isPropertyAccessOrQualifiedNameOrImportTypeNode(node: Node): node is PropertyAccessExpression | QualifiedName | ImportTypeNode;
+    function isPropertyAccessOrQualifiedName(node: Node): node is PropertyAccessExpression | QualifiedName;
+    function isCallLikeExpression(node: Node): node is CallLikeExpression;
+    function isCallOrNewExpression(node: Node): node is CallExpression | NewExpression;
+    function isTemplateLiteral(node: Node): node is TemplateLiteral;
+    function isLeftHandSideExpression(node: Node): node is LeftHandSideExpression;
+    function isUnaryExpression(node: Node): node is UnaryExpression;
+    function isUnaryExpressionWithWrite(expr: Node): expr is PrefixUnaryExpression | PostfixUnaryExpression;
+    /**
+     * Determines whether a node is an expression based only on its kind.
+     * Use `isExpressionNode` if not in transforms.
+     */
+    function isExpression(node: Node): node is Expression;
+    function isAssertionExpression(node: Node): node is AssertionExpression;
+    function isPartiallyEmittedExpression(node: Node): node is PartiallyEmittedExpression;
+    function isNotEmittedStatement(node: Node): node is NotEmittedStatement;
+    function isNotEmittedOrPartiallyEmittedNode(node: Node): node is NotEmittedStatement | PartiallyEmittedExpression;
+    function isIterationStatement(node: Node, lookInLabeledStatements: false): node is IterationStatement;
+    function isIterationStatement(node: Node, lookInLabeledStatements: boolean): node is IterationStatement | LabeledStatement;
+    function isForInOrOfStatement(node: Node): node is ForInOrOfStatement;
+    function isConciseBody(node: Node): node is ConciseBody;
+    function isFunctionBody(node: Node): node is FunctionBody;
+    function isForInitializer(node: Node): node is ForInitializer;
+    function isModuleBody(node: Node): node is ModuleBody;
+    function isNamespaceBody(node: Node): node is NamespaceBody;
+    function isJSDocNamespaceBody(node: Node): node is JSDocNamespaceBody;
+    function isNamedImportBindings(node: Node): node is NamedImportBindings;
+    function isModuleOrEnumDeclaration(node: Node): node is ModuleDeclaration | EnumDeclaration;
+    function isDeclaration(node: Node): node is NamedDeclaration;
+    function isDeclarationStatement(node: Node): node is DeclarationStatement;
+    /**
+     * Determines whether the node is a statement that is not also a declaration
+     */
+    function isStatementButNotDeclaration(node: Node): node is Statement;
+    function isStatement(node: Node): node is Statement;
+    function isModuleReference(node: Node): node is ModuleReference;
+    function isJsxTagNameExpression(node: Node): node is JsxTagNameExpression;
+    function isJsxChild(node: Node): node is JsxChild;
+    function isJsxAttributeLike(node: Node): node is JsxAttributeLike;
+    function isStringLiteralOrJsxExpression(node: Node): node is StringLiteral | JsxExpression;
+    function isJsxOpeningLikeElement(node: Node): node is JsxOpeningLikeElement;
+    function isCaseOrDefaultClause(node: Node): node is CaseOrDefaultClause;
+    /** True if node is of some JSDoc syntax kind. */
+    function isJSDocNode(node: Node): boolean;
+    /** True if node is of a kind that may contain comment text. */
+    function isJSDocCommentContainingNode(node: Node): boolean;
+    function isJSDocTag(node: Node): boolean;
+    function isSetAccessor(node: Node): node is SetAccessorDeclaration;
+    function isGetAccessor(node: Node): node is GetAccessorDeclaration;
+    /** True if has jsdoc nodes attached to it. */
+    function hasJSDocNodes(node: Node): node is HasJSDoc;
+    /** True if has type node attached to it. */
+    function hasType(node: Node): node is HasType;
+    function couldHaveType(node: Node): node is HasType;
+    /** True if has initializer node attached to it. */
+    function hasInitializer(node: Node): node is HasInitializer;
+    /** True if has initializer node attached to it. */
+    function hasOnlyExpressionInitializer(node: Node): node is HasExpressionInitializer;
+    function isObjectLiteralElement(node: Node): node is ObjectLiteralElement;
+    function isTypeReferenceType(node: Node): node is TypeReferenceType;
+    function guessIndentation(lines: string[]): number | undefined;
+    function isStringLiteralLike(node: Node): node is StringLiteralLike;
+    /** @internal */
+    function isNamedImportsOrExports(node: Node): node is NamedImportsOrExports;
+    interface ObjectAllocator {
+        getNodeConstructor(): new (kind: SyntaxKind, pos?: number, end?: number) => Node;
+        getTokenConstructor(): new <TKind extends SyntaxKind>(kind: TKind, pos?: number, end?: number) => Token<TKind>;
+        getIdentifierConstructor(): new (kind: SyntaxKind.Identifier, pos?: number, end?: number) => Identifier;
+        getSourceFileConstructor(): new (kind: SyntaxKind.SourceFile, pos?: number, end?: number) => SourceFile;
+        getSymbolConstructor(): new (flags: SymbolFlags, name: __String) => Symbol;
+        getTypeConstructor(): new (checker: TypeChecker, flags: TypeFlags) => Type;
+        getSignatureConstructor(): new (checker: TypeChecker) => Signature;
+        getSourceMapSourceConstructor(): new (fileName: string, text: string, skipTrivia?: (pos: number) => number) => SourceMapSource;
+    }
+    let objectAllocator: ObjectAllocator;
+    function formatStringFromArgs(text: string, args: ArrayLike<string>, baseIndex?: number): string;
+    let localizedDiagnosticMessages: MapLike<string> | undefined;
+    function getLocaleSpecificMessage(message: DiagnosticMessage): string;
+    function createFileDiagnostic(file: SourceFile, start: number, length: number, message: DiagnosticMessage, ...args: (string | number | undefined)[]): DiagnosticWithLocation;
+    function formatMessage(_dummy: any, message: DiagnosticMessage): string;
+    function createCompilerDiagnostic(message: DiagnosticMessage, ...args: (string | number | undefined)[]): Diagnostic;
+    function createCompilerDiagnosticFromMessageChain(chain: DiagnosticMessageChain): Diagnostic;
+    function chainDiagnosticMessages(details: DiagnosticMessageChain | undefined, message: DiagnosticMessage, ...args: (string | undefined)[]): DiagnosticMessageChain;
+    function concatenateDiagnosticMessageChains(headChain: DiagnosticMessageChain, tailChain: DiagnosticMessageChain): DiagnosticMessageChain;
+    function compareDiagnostics(d1: Diagnostic, d2: Diagnostic): Comparison;
+    function getEmitScriptTarget(compilerOptions: CompilerOptions): ScriptTarget;
+    function getEmitModuleKind(compilerOptions: {
+        module?: CompilerOptions["module"];
+        target?: CompilerOptions["target"];
+    }): ModuleKind;
+    function getEmitModuleResolutionKind(compilerOptions: CompilerOptions): ModuleResolutionKind;
+    function unreachableCodeIsError(options: CompilerOptions): boolean;
+    function unusedLabelIsError(options: CompilerOptions): boolean;
+    function getAreDeclarationMapsEnabled(options: CompilerOptions): boolean;
+    function getAllowSyntheticDefaultImports(compilerOptions: CompilerOptions): boolean;
+    function getEmitDeclarations(compilerOptions: CompilerOptions): boolean;
+    type StrictOptionName = "noImplicitAny" | "noImplicitThis" | "strictNullChecks" | "strictFunctionTypes" | "strictPropertyInitialization" | "alwaysStrict";
+    function getStrictOptionValue(compilerOptions: CompilerOptions, flag: StrictOptionName): boolean;
+    function hasZeroOrOneAsteriskCharacter(str: string): boolean;
+    /**
+     * Internally, we represent paths as strings with '/' as the directory separator.
+     * When we make system calls (eg: LanguageServiceHost.getDirectory()),
+     * we expect the host to correctly handle paths in our specified format.
+     */
+    const directorySeparator = "/";
+    /**
+     * Normalize path separators.
+     */
+    function normalizeSlashes(path: string): string;
+    /**
+     * Returns length of the root part of a path or URL (i.e. length of "/", "x:/", "//server/share/, file:///user/files").
+     *
+     * For example:
+     * ```ts
+     * getRootLength("a") === 0                   // ""
+     * getRootLength("/") === 1                   // "/"
+     * getRootLength("c:") === 2                  // "c:"
+     * getRootLength("c:d") === 0                 // ""
+     * getRootLength("c:/") === 3                 // "c:/"
+     * getRootLength("c:\\") === 3                // "c:\\"
+     * getRootLength("//server") === 7            // "//server"
+     * getRootLength("//server/share") === 8      // "//server/"
+     * getRootLength("\\\\server") === 7          // "\\\\server"
+     * getRootLength("\\\\server\\share") === 8   // "\\\\server\\"
+     * getRootLength("file:///path") === 8        // "file:///"
+     * getRootLength("file:///c:") === 10         // "file:///c:"
+     * getRootLength("file:///c:d") === 8         // "file:///"
+     * getRootLength("file:///c:/path") === 11    // "file:///c:/"
+     * getRootLength("file://server") === 13      // "file://server"
+     * getRootLength("file://server/path") === 14 // "file://server/"
+     * getRootLength("http://server") === 13      // "http://server"
+     * getRootLength("http://server/path") === 14 // "http://server/"
+     * ```
+     */
+    function getRootLength(path: string): number;
+    function normalizePath(path: string): string;
+    function normalizePathAndParts(path: string): {
+        path: string;
+        parts: string[];
+    };
+    /**
+     * Returns the path except for its basename. Semantics align with NodeJS's `path.dirname`
+     * except that we support URL's as well.
+     *
+     * ```ts
+     * getDirectoryPath("/path/to/file.ext") === "/path/to"
+     * getDirectoryPath("/path/to/") === "/path"
+     * getDirectoryPath("/") === "/"
+     * ```
+     */
+    function getDirectoryPath(path: Path): Path;
+    /**
+     * Returns the path except for its basename. Semantics align with NodeJS's `path.dirname`
+     * except that we support URL's as well.
+     *
+     * ```ts
+     * getDirectoryPath("/path/to/file.ext") === "/path/to"
+     * getDirectoryPath("/path/to/") === "/path"
+     * getDirectoryPath("/") === "/"
+     * ```
+     */
+    function getDirectoryPath(path: string): string;
+    function isUrl(path: string): boolean;
+    function pathIsRelative(path: string): boolean;
+    /**
+     * Determines whether a path is an absolute path (e.g. starts with `/`, or a dos path
+     * like `c:`, `c:\` or `c:/`).
+     */
+    function isRootedDiskPath(path: string): boolean;
+    /**
+     * Determines whether a path consists only of a path root.
+     */
+    function isDiskPathRoot(path: string): boolean;
+    function convertToRelativePath(absoluteOrRelativePath: string, basePath: string, getCanonicalFileName: (path: string) => string): string;
+    /**
+     * Parse a path into an array containing a root component (at index 0) and zero or more path
+     * components (at indices > 0). The result is not normalized.
+     * If the path is relative, the root component is `""`.
+     * If the path is absolute, the root component includes the first path separator (`/`).
+     */
+    function getPathComponents(path: string, currentDirectory?: string): string[];
+    /**
+     * Reduce an array of path components to a more simplified path by navigating any
+     * `"."` or `".."` entries in the path.
+     */
+    function reducePathComponents(components: ReadonlyArray<string>): string[];
+    /**
+     * Parse a path into an array containing a root component (at index 0) and zero or more path
+     * components (at indices > 0). The result is normalized.
+     * If the path is relative, the root component is `""`.
+     * If the path is absolute, the root component includes the first path separator (`/`).
+     */
+    function getNormalizedPathComponents(path: string, currentDirectory: string | undefined): string[];
+    function getNormalizedAbsolutePath(fileName: string, currentDirectory: string | undefined): string;
+    /**
+     * Formats a parsed path consisting of a root component (at index 0) and zero or more path
+     * segments (at indices > 0).
+     */
+    function getPathFromPathComponents(pathComponents: ReadonlyArray<string>): string;
+    function getRelativePathFromFile(from: string, to: string, getCanonicalFileName: GetCanonicalFileName): string;
+    /**
+     * Gets a relative path that can be used to traverse between `from` and `to`.
+     */
+    function getRelativePathFromDirectory(from: string, to: string, ignoreCase: boolean): string;
+    /**
+     * Gets a relative path that can be used to traverse between `from` and `to`.
+     */
+    function getRelativePathFromDirectory(fromDirectory: string, to: string, getCanonicalFileName: GetCanonicalFileName): string;
+    function getRelativePathToDirectoryOrUrl(directoryPathOrUrl: string, relativeOrAbsolutePath: string, currentDirectory: string, getCanonicalFileName: GetCanonicalFileName, isAbsolutePathAnUrl: boolean): string;
+    /**
+     * Ensures a path is either absolute (prefixed with `/` or `c:`) or dot-relative (prefixed
+     * with `./` or `../`) so as not to be confused with an unprefixed module name.
+     */
+    function ensurePathIsNonModuleName(path: string): string;
+    /**
+     * Returns the path except for its containing directory name.
+     * Semantics align with NodeJS's `path.basename` except that we support URL's as well.
+     *
+     * ```ts
+     * getBaseFileName("/path/to/file.ext") === "file.ext"
+     * getBaseFileName("/path/to/") === "to"
+     * getBaseFileName("/") === ""
+     * ```
+     */
+    function getBaseFileName(path: string): string;
+    /**
+     * Gets the portion of a path following the last (non-terminal) separator (`/`).
+     * Semantics align with NodeJS's `path.basename` except that we support URL's as well.
+     * If the base name has any one of the provided extensions, it is removed.
+     *
+     * ```ts
+     * getBaseFileName("/path/to/file.ext", ".ext", true) === "file"
+     * getBaseFileName("/path/to/file.js", ".ext", true) === "file.js"
+     * ```
+     */
+    function getBaseFileName(path: string, extensions: string | ReadonlyArray<string>, ignoreCase: boolean): string;
+    /**
+     * Combines paths. If a path is absolute, it replaces any previous path.
+     */
+    function combinePaths(path: string, ...paths: (string | undefined)[]): string;
+    /**
+     * Combines and resolves paths. If a path is absolute, it replaces any previous path. Any
+     * `.` and `..` path components are resolved.
+     */
+    function resolvePath(path: string, ...paths: (string | undefined)[]): string;
+    /**
+     * Determines whether a path has a trailing separator (`/` or `\\`).
+     */
+    function hasTrailingDirectorySeparator(path: string): boolean;
+    /**
+     * Removes a trailing directory separator from a path.
+     * @param path The path.
+     */
+    function removeTrailingDirectorySeparator(path: Path): Path;
+    function removeTrailingDirectorySeparator(path: string): string;
+    /**
+     * Adds a trailing directory separator to a path, if it does not already have one.
+     * @param path The path.
+     */
+    function ensureTrailingDirectorySeparator(path: Path): Path;
+    function ensureTrailingDirectorySeparator(path: string): string;
+    /**
+     * Performs a case-sensitive comparison of two paths.
+     */
+    function comparePathsCaseSensitive(a: string, b: string): Comparison;
+    /**
+     * Performs a case-insensitive comparison of two paths.
+     */
+    function comparePathsCaseInsensitive(a: string, b: string): Comparison;
+    function comparePaths(a: string, b: string, ignoreCase?: boolean): Comparison;
+    function comparePaths(a: string, b: string, currentDirectory: string, ignoreCase?: boolean): Comparison;
+    function containsPath(parent: string, child: string, ignoreCase?: boolean): boolean;
+    function containsPath(parent: string, child: string, currentDirectory: string, ignoreCase?: boolean): boolean;
+    function tryRemoveDirectoryPrefix(path: string, dirPath: string): string | undefined;
+    function hasExtension(fileName: string): boolean;
+    const commonPackageFolders: ReadonlyArray<string>;
+    function getRegularExpressionForWildcard(specs: ReadonlyArray<string> | undefined, basePath: string, usage: "files" | "directories" | "exclude"): string | undefined;
+    /**
+     * An "includes" path "foo" is implicitly a glob "foo/** /*" (without the space) if its last component has no extension,
+     * and does not contain any glob characters itself.
+     */
+    function isImplicitGlob(lastPathComponent: string): boolean;
+    interface FileSystemEntries {
+        readonly files: ReadonlyArray<string>;
+        readonly directories: ReadonlyArray<string>;
+    }
+    interface FileMatcherPatterns {
+        /** One pattern for each "include" spec. */
+        includeFilePatterns: ReadonlyArray<string> | undefined;
+        /** One pattern matching one of any of the "include" specs. */
+        includeFilePattern: string | undefined;
+        includeDirectoryPattern: string | undefined;
+        excludePattern: string | undefined;
+        basePaths: ReadonlyArray<string>;
+    }
+    /** @param path directory of the tsconfig.json */
+    function getFileMatcherPatterns(path: string, excludes: ReadonlyArray<string> | undefined, includes: ReadonlyArray<string> | undefined, useCaseSensitiveFileNames: boolean, currentDirectory: string): FileMatcherPatterns;
+    function getRegexFromPattern(pattern: string, useCaseSensitiveFileNames: boolean): RegExp;
+    /** @param path directory of the tsconfig.json */
+    function matchFiles(path: string, extensions: ReadonlyArray<string> | undefined, excludes: ReadonlyArray<string> | undefined, includes: ReadonlyArray<string> | undefined, useCaseSensitiveFileNames: boolean, currentDirectory: string, depth: number | undefined, getFileSystemEntries: (path: string) => FileSystemEntries): string[];
+    function ensureScriptKind(fileName: string, scriptKind: ScriptKind | undefined): ScriptKind;
+    function getScriptKindFromFileName(fileName: string): ScriptKind;
+    /**
+     *  List of supported extensions in order of file resolution precedence.
+     */
+    const supportedTypeScriptExtensions: ReadonlyArray<Extension>;
+    /** Must have ".d.ts" first because if ".ts" goes first, that will be detected as the extension instead of ".d.ts". */
+    const supportedTypescriptExtensionsForExtractExtension: ReadonlyArray<Extension>;
+    const supportedJavascriptExtensions: ReadonlyArray<Extension>;
+    function getSupportedExtensions(options?: CompilerOptions, extraFileExtensions?: ReadonlyArray<FileExtensionInfo>): ReadonlyArray<string>;
+    function hasJavaScriptFileExtension(fileName: string): boolean;
+    function hasTypeScriptFileExtension(fileName: string): boolean;
+    function isSupportedSourceFileName(fileName: string, compilerOptions?: CompilerOptions, extraFileExtensions?: ReadonlyArray<FileExtensionInfo>): boolean;
+    /**
+     * Extension boundaries by priority. Lower numbers indicate higher priorities, and are
+     * aligned to the offset of the highest priority extension in the
+     * allSupportedExtensions array.
+     */
+    enum ExtensionPriority {
+        TypeScriptFiles = 0,
+        DeclarationAndJavaScriptFiles = 2,
+        Highest = 0,
+        Lowest = 2
+    }
+    function getExtensionPriority(path: string, supportedExtensions: ReadonlyArray<string>): ExtensionPriority;
+    /**
+     * Adjusts an extension priority to be the highest priority within the same range.
+     */
+    function adjustExtensionPriority(extensionPriority: ExtensionPriority, supportedExtensions: ReadonlyArray<string>): ExtensionPriority;
+    /**
+     * Gets the next lowest extension priority for a given priority.
+     */
+    function getNextLowestExtensionPriority(extensionPriority: ExtensionPriority, supportedExtensions: ReadonlyArray<string>): ExtensionPriority;
+    function removeFileExtension(path: string): string;
+    function tryRemoveExtension(path: string, extension: string): string | undefined;
+    function removeExtension(path: string, extension: string): string;
+    function changeExtension<T extends string | Path>(path: T, newExtension: string): T;
+    function changeAnyExtension(path: string, ext: string): string;
+    function changeAnyExtension(path: string, ext: string, extensions: string | ReadonlyArray<string>, ignoreCase: boolean): string;
+    namespace Debug {
+        function showSymbol(symbol: Symbol): string;
+        function showSyntaxKind(node: Node): string;
+    }
+    function tryParsePattern(pattern: string): Pattern | undefined;
+    function positionIsSynthesized(pos: number): boolean;
+    /** True if an extension is one of the supported TypeScript extensions. */
+    function extensionIsTypeScript(ext: Extension): boolean;
+    function resolutionExtensionIsTypeScriptOrJson(ext: Extension): boolean;
+    /**
+     * Gets the extension from a path.
+     * Path must have a valid extension.
+     */
+    function extensionFromPath(path: string): Extension;
+    function isAnySupportedFileExtension(path: string): boolean;
+    function tryGetExtensionFromPath(path: string): Extension | undefined;
+    /**
+     * Gets the file extension for a path.
+     */
+    function getAnyExtensionFromPath(path: string): string;
+    /**
+     * Gets the file extension for a path, provided it is one of the provided extensions.
+     */
+    function getAnyExtensionFromPath(path: string, extensions: string | ReadonlyArray<string>, ignoreCase: boolean): string;
+    function isCheckJsEnabledForFile(sourceFile: SourceFile, compilerOptions: CompilerOptions): boolean | undefined;
+    const emptyFileSystemEntries: FileSystemEntries;
+    /**
+     * patternStrings contains both pattern strings (containing "*") and regular strings.
+     * Return an exact match if possible, or a pattern match, or undefined.
+     * (These are verified by verifyCompilerOptions to have 0 or 1 "*" characters.)
+     */
+    function matchPatternOrExact(patternStrings: ReadonlyArray<string>, candidate: string): string | Pattern | undefined;
+}
+declare namespace ts {
+    function createNode(kind: SyntaxKind, pos?: number, end?: number): Node;
+    function isJSDocLikeText(text: string, start: number): boolean;
+    /**
+     * Invokes a callback for each child of the given node. The 'cbNode' callback is invoked for all child nodes
+     * stored in properties. If a 'cbNodes' callback is specified, it is invoked for embedded arrays; otherwise,
+     * embedded arrays are flattened and the 'cbNode' callback is invoked for each element. If a callback returns
+     * a truthy value, iteration stops and that value is returned. Otherwise, undefined is returned.
+     *
+     * @param node a given node to visit its children
+     * @param cbNode a callback to be invoked for all child nodes
+     * @param cbNodes a callback to be invoked for embedded array
+     *
+     * @remarks `forEachChild` must visit the children of a node in the order
+     * that they appear in the source code. The language service depends on this property to locate nodes by position.
+     */
+    function forEachChild<T>(node: Node, cbNode: (node: Node) => T | undefined, cbNodes?: (nodes: NodeArray<Node>) => T | undefined): T | undefined;
+    function createSourceFile(fileName: string, sourceText: string, languageVersion: ScriptTarget, setParentNodes?: boolean, scriptKind?: ScriptKind): SourceFile;
+    function parseIsolatedEntityName(text: string, languageVersion: ScriptTarget): EntityName | undefined;
+    /**
+     * Parse json text into SyntaxTree and return node and parse errors if any
+     * @param fileName
+     * @param sourceText
+     */
+    function parseJsonText(fileName: string, sourceText: string): JsonSourceFile;
+    function isExternalModule(file: SourceFile): boolean;
+    function updateSourceFile(sourceFile: SourceFile, newText: string, textChangeRange: TextChangeRange, aggressiveChecks?: boolean): SourceFile;
+    function parseIsolatedJSDocComment(content: string, start?: number, length?: number): {
+        jsDoc: JSDoc;
+        diagnostics: Diagnostic[];
+    } | undefined;
+    function parseJSDocTypeExpressionForTests(content: string, start?: number, length?: number): {
+        jsDocTypeExpression: JSDocTypeExpression;
+        diagnostics: Diagnostic[];
+    } | undefined;
+    interface PragmaContext {
+        languageVersion: ScriptTarget;
+        pragmas?: PragmaMap;
+        checkJsDirective?: CheckJsDirective;
+        referencedFiles: FileReference[];
+        typeReferenceDirectives: FileReference[];
+        libReferenceDirectives: FileReference[];
+        amdDependencies: AmdDependency[];
+        hasNoDefaultLib?: boolean;
+        moduleName?: string;
+    }
+    function processCommentPragmas(context: PragmaContext, sourceText: string): void;
+    type PragmaDiagnosticReporter = (pos: number, length: number, message: DiagnosticMessage) => void;
+    function processPragmasIntoFields(context: PragmaContext, reportDiagnostic: PragmaDiagnosticReporter): void;
+    /** @internal */
+    function tagNamesAreEquivalent(lhs: JsxTagNameExpression, rhs: JsxTagNameExpression): boolean;
+}
+declare namespace ts {
+    const compileOnSaveCommandLineOption: CommandLineOption;
+    /**
+     * An array of supported "lib" reference file names used to determine the order for inclusion
+     * when referenced, as well as for spelling suggestions. This ensures the correct ordering for
+     * overload resolution when a type declared in one lib is extended by another.
+     */
+    const libs: string[];
+    /**
+     * A map of lib names to lib files. This map is used both for parsing the "lib" command line
+     * option as well as for resolving lib reference directives.
+     */
+    const libMap: Map<string>;
+    const optionDeclarations: CommandLineOption[];
+    const typeAcquisitionDeclarations: CommandLineOption[];
+    interface OptionNameMap {
+        optionNameMap: Map<CommandLineOption>;
+        shortOptionNames: Map<string>;
+    }
+    const defaultInitCompilerOptions: CompilerOptions;
+    function convertEnableAutoDiscoveryToEnable(typeAcquisition: TypeAcquisition): TypeAcquisition;
+    function createCompilerDiagnosticForInvalidCustomType(opt: CommandLineOptionOfCustomType): Diagnostic;
+    function parseCustomTypeOption(opt: CommandLineOptionOfCustomType, value: string, errors: Push<Diagnostic>): string | number | undefined;
+    function parseListTypeOption(opt: CommandLineOptionOfListType, value: string | undefined, errors: Push<Diagnostic>): (string | number)[] | undefined;
+    function parseCommandLine(commandLine: ReadonlyArray<string>, readFile?: (path: string) => string | undefined): ParsedCommandLine;
+    /** @internal */
+    function getOptionFromName(optionName: string, allowShort?: boolean): CommandLineOption | undefined;
+    function printVersion(): void;
+    function printHelp(optionsList: CommandLineOption[], syntaxPrefix?: string): void;
+    type DiagnosticReporter = (diagnostic: Diagnostic) => void;
+    /**
+     * Reports config file diagnostics
+     */
+    interface ConfigFileDiagnosticsReporter {
+        /**
+         * Reports unrecoverable error when parsing config file
+         */
+        onUnRecoverableConfigFileDiagnostic: DiagnosticReporter;
+    }
+    /**
+     * Interface extending ParseConfigHost to support ParseConfigFile that reads config file and reports errors
+     */
+    interface ParseConfigFileHost extends ParseConfigHost, ConfigFileDiagnosticsReporter {
+        getCurrentDirectory(): string;
+    }
+    /**
+     * Reads the config file, reports errors if any and exits if the config file cannot be found
+     */
+    function getParsedCommandLineOfConfigFile(configFileName: string, optionsToExtend: CompilerOptions, host: ParseConfigFileHost): ParsedCommandLine | undefined;
+    /**
+     * Read tsconfig.json file
+     * @param fileName The path to the config file
+     */
+    function readConfigFile(fileName: string, readFile: (path: string) => string | undefined): {
+        config?: any;
+        error?: Diagnostic;
+    };
+    /**
+     * Parse the text of the tsconfig.json file
+     * @param fileName The path to the config file
+     * @param jsonText The text of the config file
+     */
+    function parseConfigFileTextToJson(fileName: string, jsonText: string): {
+        config?: any;
+        error?: Diagnostic;
+    };
+    /**
+     * Read tsconfig.json file
+     * @param fileName The path to the config file
+     */
+    function readJsonConfigFile(fileName: string, readFile: (path: string) => string | undefined): TsConfigSourceFile;
+    interface JsonConversionNotifier {
+        /**
+         * Notifies parent option object is being set with the optionKey and a valid optionValue
+         * Currently it notifies only if there is element with type object (parentOption) and
+         * has element's option declarations map associated with it
+         * @param parentOption parent option name in which the option and value are being set
+         * @param option option declaration which is being set with the value
+         * @param value value of the option
+         */
+        onSetValidOptionKeyValueInParent(parentOption: string, option: CommandLineOption, value: CompilerOptionsValue): void;
+        /**
+         * Notify when valid root key value option is being set
+         * @param key option key
+         * @param keyNode node corresponding to node in the source file
+         * @param value computed value of the key
+         * @param ValueNode node corresponding to value in the source file
+         */
+        onSetValidOptionKeyValueInRoot(key: string, keyNode: PropertyName, value: CompilerOptionsValue, valueNode: Expression): void;
+        /**
+         * Notify when unknown root key value option is being set
+         * @param key option key
+         * @param keyNode node corresponding to node in the source file
+         * @param value computed value of the key
+         * @param ValueNode node corresponding to value in the source file
+         */
+        onSetUnknownOptionKeyValueInRoot(key: string, keyNode: PropertyName, value: CompilerOptionsValue, valueNode: Expression): void;
+    }
+    /**
+     * Convert the json syntax tree into the json value
+     */
+    function convertToObject(sourceFile: JsonSourceFile, errors: Push<Diagnostic>): any;
+    /**
+     * Convert the json syntax tree into the json value and report errors
+     * This returns the json value (apart from checking errors) only if returnValue provided is true.
+     * Otherwise it just checks the errors and returns undefined
+     */
+    function convertToObjectWorker(sourceFile: JsonSourceFile, errors: Push<Diagnostic>, returnValue: boolean, knownRootOptions: CommandLineOption | undefined, jsonConversionNotifier: JsonConversionNotifier | undefined): any;
+    /**
+     * Generate tsconfig configuration when running command line "--init"
+     * @param options commandlineOptions to be generated into tsconfig.json
+     * @param fileNames array of filenames to be generated into tsconfig.json
+     */
+    function generateTSConfig(options: CompilerOptions, fileNames: ReadonlyArray<string>, newLine: string): string;
+    /**
+     * Parse the contents of a config file (tsconfig.json).
+     * @param json The contents of the config file to parse
+     * @param host Instance of ParseConfigHost used to enumerate files in folder.
+     * @param basePath A root directory to resolve relative path entries in the config
+     *    file to. e.g. outDir
+     */
+    function parseJsonConfigFileContent(json: any, host: ParseConfigHost, basePath: string, existingOptions?: CompilerOptions, configFileName?: string, resolutionStack?: Path[], extraFileExtensions?: ReadonlyArray<FileExtensionInfo>): ParsedCommandLine;
+    /**
+     * Parse the contents of a config file (tsconfig.json).
+     * @param jsonNode The contents of the config file to parse
+     * @param host Instance of ParseConfigHost used to enumerate files in folder.
+     * @param basePath A root directory to resolve relative path entries in the config
+     *    file to. e.g. outDir
+     */
+    function parseJsonSourceFileConfigFileContent(sourceFile: TsConfigSourceFile, host: ParseConfigHost, basePath: string, existingOptions?: CompilerOptions, configFileName?: string, resolutionStack?: Path[], extraFileExtensions?: ReadonlyArray<FileExtensionInfo>): ParsedCommandLine;
+    function setConfigFileInOptions(options: CompilerOptions, configFile: TsConfigSourceFile | undefined): void;
+    function isErrorNoInputFiles(error: Diagnostic): boolean;
+    function getErrorForNoInputFiles({ includeSpecs, excludeSpecs }: ConfigFileSpecs, configFileName: string | undefined): Diagnostic;
+    function convertCompilerOptionsFromJson(jsonOptions: any, basePath: string, configFileName?: string): {
+        options: CompilerOptions;
+        errors: Diagnostic[];
+    };
+    function convertTypeAcquisitionFromJson(jsonOptions: any, basePath: string, configFileName?: string): {
+        options: TypeAcquisition;
+        errors: Diagnostic[];
+    };
+    /**
+     * Gets the file names from the provided config file specs that contain, files, include, exclude and
+     * other properties needed to resolve the file names
+     * @param spec The config file specs extracted with file names to include, wildcards to include/exclude and other details
+     * @param basePath The base path for any relative file specifications.
+     * @param options Compiler options.
+     * @param host The host used to resolve files and directories.
+     * @param extraFileExtensions optionaly file extra file extension information from host
+     */
+    function getFileNamesFromConfigSpecs(spec: ConfigFileSpecs, basePath: string, options: CompilerOptions, host: ParseConfigHost, extraFileExtensions?: ReadonlyArray<FileExtensionInfo>): ExpandResult;
+    /**
+     * Produces a cleaned version of compiler options with personally identifiying info (aka, paths) removed.
+     * Also converts enum values back to strings.
+     */
+    function convertCompilerOptionsForTelemetry(opts: CompilerOptions): CompilerOptions;
+}
+declare namespace ts {
+    function trace(host: ModuleResolutionHost, message: DiagnosticMessage, ...args: any[]): void;
+    function isTraceEnabled(compilerOptions: CompilerOptions, host: ModuleResolutionHost): boolean;
+    /** Array that is only intended to be pushed to, never read. */
+    interface Push<T> {
+        push(value: T): void;
+    }
+    function readJson(path: string, host: {
+        readFile(fileName: string): string | undefined;
+    }): object;
+    function getEffectiveTypeRoots(options: CompilerOptions, host: GetEffectiveTypeRootsHost): string[] | undefined;
+    /**
+     * @param {string | undefined} containingFile - file that contains type reference directive, can be undefined if containing file is unknown.
+     * This is possible in case if resolution is performed for directives specified via 'types' parameter. In this case initial path for secondary lookups
+     * is assumed to be the same as root directory of the project.
+     */
+    function resolveTypeReferenceDirective(typeReferenceDirectiveName: string, containingFile: string | undefined, options: CompilerOptions, host: ModuleResolutionHost): ResolvedTypeReferenceDirectiveWithFailedLookupLocations;
+    /**
+     * Given a set of options, returns the set of type directive names
+     *   that should be included for this program automatically.
+     * This list could either come from the config file,
+     *   or from enumerating the types root + initial secondary types lookup location.
+     * More type directives might appear in the program later as a result of loading actual source files;
+     *   this list is only the set of defaults that are implicitly included.
+     */
+    function getAutomaticTypeDirectiveNames(options: CompilerOptions, host: ModuleResolutionHost): string[];
+    /**
+     * Cached module resolutions per containing directory.
+     * This assumes that any module id will have the same resolution for sibling files located in the same folder.
+     */
+    interface ModuleResolutionCache extends NonRelativeModuleNameResolutionCache {
+        getOrCreateCacheForDirectory(directoryName: string): Map<ResolvedModuleWithFailedLookupLocations>;
+    }
+    /**
+     * Stored map from non-relative module name to a table: directory -> result of module lookup in this directory
+     * We support only non-relative module names because resolution of relative module names is usually more deterministic and thus less expensive.
+     */
+    interface NonRelativeModuleNameResolutionCache {
+        getOrCreateCacheForModuleName(nonRelativeModuleName: string): PerModuleNameCache;
+    }
+    interface PerModuleNameCache {
+        get(directory: string): ResolvedModuleWithFailedLookupLocations | undefined;
+        set(directory: string, result: ResolvedModuleWithFailedLookupLocations): void;
+    }
+    function createModuleResolutionCache(currentDirectory: string, getCanonicalFileName: (s: string) => string): ModuleResolutionCache;
+    function createModuleResolutionCacheWithMaps(directoryToModuleNameMap: Map<Map<ResolvedModuleWithFailedLookupLocations>>, moduleNameToDirectoryMap: Map<PerModuleNameCache>, currentDirectory: string, getCanonicalFileName: GetCanonicalFileName): ModuleResolutionCache;
+    function resolveModuleNameFromCache(moduleName: string, containingFile: string, cache: ModuleResolutionCache): ResolvedModuleWithFailedLookupLocations | undefined;
+    function resolveModuleName(moduleName: string, containingFile: string, compilerOptions: CompilerOptions, host: ModuleResolutionHost, cache?: ModuleResolutionCache): ResolvedModuleWithFailedLookupLocations;
+    function nodeModuleNameResolver(moduleName: string, containingFile: string, compilerOptions: CompilerOptions, host: ModuleResolutionHost, cache?: ModuleResolutionCache): ResolvedModuleWithFailedLookupLocations;
+    /**
+     * Expose resolution logic to allow us to use Node module resolution logic from arbitrary locations.
+     * No way to do this with `require()`: https://github.com/nodejs/node/issues/5963
+     * Throws an error if the module can't be resolved.
+     */
+    function resolveJavaScriptModule(moduleName: string, initialDir: string, host: ModuleResolutionHost): string;
+    function directoryProbablyExists(directoryName: string, host: {
+        directoryExists?: (directoryName: string) => boolean;
+    }): boolean;
+    function getPackageName(moduleName: string): {
+        packageName: string;
+        rest: string;
+    };
+    function getTypesPackageName(packageName: string): string;
+    function getMangledNameForScopedPackage(packageName: string): string;
+    function getPackageNameFromAtTypesDirectory(mangledName: string): string;
+    function getUnmangledNameForScopedPackage(typesPackageName: string): string;
+    function classicNameResolver(moduleName: string, containingFile: string, compilerOptions: CompilerOptions, host: ModuleResolutionHost, cache?: NonRelativeModuleNameResolutionCache): ResolvedModuleWithFailedLookupLocations;
+    /**
+     * LSHost may load a module from a global cache of typings.
+     * This is the minumum code needed to expose that functionality; the rest is in LSHost.
+     */
+    function loadModuleFromGlobalCache(moduleName: string, projectName: string | undefined, compilerOptions: CompilerOptions, host: ModuleResolutionHost, globalCache: string): ResolvedModuleWithFailedLookupLocations;
+}
+//# sourceMappingURL=parser.d.ts.map
+declare namespace ts {
+    enum ModuleInstanceState {
+        NonInstantiated = 0,
+        Instantiated = 1,
+        ConstEnumOnly = 2
+    }
+    function getModuleInstanceState(node: ModuleDeclaration): ModuleInstanceState;
+    function bindSourceFile(file: SourceFile, options: CompilerOptions): void;
+    function isExportsOrModuleExportsOrAlias(sourceFile: SourceFile, node: Expression): boolean;
+    /**
+     * Computes the transform flags for a node, given the transform flags of its subtree
+     *
+     * @param node The node to analyze
+     * @param subtreeFlags Transform flags computed for this node's subtree
+     */
+    function computeTransformFlagsForNode(node: Node, subtreeFlags: TransformFlags): TransformFlags;
+    /**
+     * Gets the transform flags to exclude when unioning the transform flags of a subtree.
+     *
+     * NOTE: This needs to be kept up-to-date with the exclusions used in `computeTransformFlagsForNode`.
+     *       For performance reasons, `computeTransformFlagsForNode` uses local constant values rather
+     *       than calling this function.
+     */
+    function getTransformFlagsSubtreeExclusions(kind: SyntaxKind): TransformFlags.OuterExpressionExcludes | TransformFlags.PropertyAccessExcludes | TransformFlags.NodeExcludes | TransformFlags.ArrowFunctionExcludes | TransformFlags.FunctionExcludes | TransformFlags.ConstructorExcludes | TransformFlags.ClassExcludes | TransformFlags.ModuleExcludes | TransformFlags.TypeExcludes | TransformFlags.ObjectLiteralExcludes | TransformFlags.ArrayLiteralOrCallOrNewExcludes | TransformFlags.VariableDeclarationListExcludes | TransformFlags.CatchClauseExcludes;
+}
+/** @internal */
+declare namespace ts {
+    function createGetSymbolWalker(getRestTypeOfSignature: (sig: Signature) => Type, getTypePredicateOfSignature: (sig: Signature) => TypePredicate | undefined, getReturnTypeOfSignature: (sig: Signature) => Type, getBaseTypes: (type: Type) => Type[], resolveStructuredTypeMembers: (type: ObjectType) => ResolvedType, getTypeOfSymbol: (sym: Symbol) => Type, getResolvedSymbol: (node: Node) => Symbol, getIndexTypeOfStructuredType: (type: Type, kind: IndexKind) => Type | undefined, getConstraintFromTypeParameter: (typeParameter: TypeParameter) => Type | undefined, getFirstIdentifier: (node: EntityNameOrEntityNameExpression) => Identifier): (accept?: (symbol: Symbol) => boolean) => SymbolWalker;
+}
+declare namespace ts {
+    function getNodeId(node: Node): number;
+    function getSymbolId(symbol: Symbol): number;
+    function isInstantiatedModule(node: ModuleDeclaration, preserveConstEnums: boolean): boolean;
+    function createTypeChecker(host: TypeCheckerHost, produceDiagnostics: boolean): TypeChecker;
+}
+declare namespace ts {
+    function updateNode<T extends Node>(updated: T, original: T): T;
+    function createNodeArray<T extends Node>(elements?: T[], hasTrailingComma?: boolean): MutableNodeArray<T>;
+    function createNodeArray<T extends Node>(elements?: ReadonlyArray<T>, hasTrailingComma?: boolean): NodeArray<T>;
+    /**
+     * Creates a shallow, memberwise clone of a node with no source map location.
+     */
+    function getSynthesizedClone<T extends Node>(node: T): T;
+    function createLiteral(value: string | StringLiteral | NoSubstitutionTemplateLiteral | NumericLiteral | Identifier, isSingleQuote: boolean): StringLiteral;
+    /** If a node is passed, creates a string literal whose source text is read from a source node during emit. */
+    function createLiteral(value: string | StringLiteral | NoSubstitutionTemplateLiteral | NumericLiteral | Identifier): StringLiteral;
+    function createLiteral(value: number): NumericLiteral;
+    function createLiteral(value: boolean): BooleanLiteral;
+    function createLiteral(value: string | number | boolean): PrimaryExpression;
+    function createNumericLiteral(value: string): NumericLiteral;
+    function createStringLiteral(text: string): StringLiteral;
+    function createRegularExpressionLiteral(text: string): RegularExpressionLiteral;
+    function createIdentifier(text: string): Identifier;
+    function createIdentifier(text: string, typeArguments: ReadonlyArray<TypeNode | TypeParameterDeclaration> | undefined): Identifier;
+    function updateIdentifier(node: Identifier): Identifier;
+    function updateIdentifier(node: Identifier, typeArguments: NodeArray<TypeNode | TypeParameterDeclaration> | undefined): Identifier;
+    /** Create a unique temporary variable. */
+    function createTempVariable(recordTempVariable: ((node: Identifier) => void) | undefined): Identifier;
+    function createTempVariable(recordTempVariable: ((node: Identifier) => void) | undefined, reservedInNestedScopes: boolean): GeneratedIdentifier;
+    /** Create a unique temporary variable for use in a loop. */
+    function createLoopVariable(): Identifier;
+    /** Create a unique name based on the supplied text. */
+    function createUniqueName(text: string): Identifier;
+    function createOptimisticUniqueName(text: string): GeneratedIdentifier;
+    /** Create a unique name based on the supplied text. */
+    function createOptimisticUniqueName(text: string): Identifier;
+    /** Create a unique name based on the supplied text. This does not consider names injected by the transformer. */
+    function createFileLevelUniqueName(text: string): Identifier;
+    /** Create a unique name generated for a node. */
+    function getGeneratedNameForNode(node: Node): Identifier;
+    function getGeneratedNameForNode(node: Node, flags: GeneratedIdentifierFlags): Identifier;
+    function createToken<TKind extends SyntaxKind>(token: TKind): Token<TKind>;
+    function createSuper(): SuperExpression;
+    function createThis(): ThisExpression & Token<SyntaxKind.ThisKeyword>;
+    function createNull(): NullLiteral & Token<SyntaxKind.NullKeyword>;
+    function createTrue(): BooleanLiteral & Token<SyntaxKind.TrueKeyword>;
+    function createFalse(): BooleanLiteral & Token<SyntaxKind.FalseKeyword>;
+    function createModifier<T extends Modifier["kind"]>(kind: T): Token<T>;
+    function createModifiersFromModifierFlags(flags: ModifierFlags): Modifier[];
+    function createQualifiedName(left: EntityName, right: string | Identifier): QualifiedName;
+    function updateQualifiedName(node: QualifiedName, left: EntityName, right: Identifier): QualifiedName;
+    function createComputedPropertyName(expression: Expression): ComputedPropertyName;
+    function updateComputedPropertyName(node: ComputedPropertyName, expression: Expression): ComputedPropertyName;
+    function createTypeParameterDeclaration(name: string | Identifier, constraint?: TypeNode, defaultType?: TypeNode): TypeParameterDeclaration;
+    function updateTypeParameterDeclaration(node: TypeParameterDeclaration, name: Identifier, constraint: TypeNode | undefined, defaultType: TypeNode | undefined): TypeParameterDeclaration;
+    function createParameter(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, dotDotDotToken: DotDotDotToken | undefined, name: string | BindingName, questionToken?: QuestionToken, type?: TypeNode, initializer?: Expression): ParameterDeclaration;
+    function updateParameter(node: ParameterDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, dotDotDotToken: DotDotDotToken | undefined, name: string | BindingName, questionToken: QuestionToken | undefined, type: TypeNode | undefined, initializer: Expression | undefined): ParameterDeclaration;
+    function createDecorator(expression: Expression): Decorator;
+    function updateDecorator(node: Decorator, expression: Expression): Decorator;
+    function createPropertySignature(modifiers: ReadonlyArray<Modifier> | undefined, name: PropertyName | string, questionToken: QuestionToken | undefined, type: TypeNode | undefined, initializer: Expression | undefined): PropertySignature;
+    function updatePropertySignature(node: PropertySignature, modifiers: ReadonlyArray<Modifier> | undefined, name: PropertyName, questionToken: QuestionToken | undefined, type: TypeNode | undefined, initializer: Expression | undefined): PropertySignature;
+    function createProperty(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | PropertyName, questionOrExclamationToken: QuestionToken | ExclamationToken | undefined, type: TypeNode | undefined, initializer: Expression | undefined): PropertyDeclaration;
+    function updateProperty(node: PropertyDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | PropertyName, questionOrExclamationToken: QuestionToken | ExclamationToken | undefined, type: TypeNode | undefined, initializer: Expression | undefined): PropertyDeclaration;
+    function createMethodSignature(typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, name: string | PropertyName, questionToken: QuestionToken | undefined): MethodSignature;
+    function updateMethodSignature(node: MethodSignature, typeParameters: NodeArray<TypeParameterDeclaration> | undefined, parameters: NodeArray<ParameterDeclaration>, type: TypeNode | undefined, name: PropertyName, questionToken: QuestionToken | undefined): MethodSignature;
+    function createMethod(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, asteriskToken: AsteriskToken | undefined, name: string | PropertyName, questionToken: QuestionToken | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, body: Block | undefined): MethodDeclaration;
+    function updateMethod(node: MethodDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, asteriskToken: AsteriskToken | undefined, name: PropertyName, questionToken: QuestionToken | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, body: Block | undefined): MethodDeclaration;
+    function createConstructor(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, body: Block | undefined): ConstructorDeclaration;
+    function updateConstructor(node: ConstructorDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, body: Block | undefined): ConstructorDeclaration;
+    function createGetAccessor(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | PropertyName, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, body: Block | undefined): GetAccessorDeclaration;
+    function updateGetAccessor(node: GetAccessorDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: PropertyName, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, body: Block | undefined): GetAccessorDeclaration;
+    function createSetAccessor(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | PropertyName, parameters: ReadonlyArray<ParameterDeclaration>, body: Block | undefined): SetAccessorDeclaration;
+    function updateSetAccessor(node: SetAccessorDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: PropertyName, parameters: ReadonlyArray<ParameterDeclaration>, body: Block | undefined): SetAccessorDeclaration;
+    function createCallSignature(typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined): CallSignatureDeclaration;
+    function updateCallSignature(node: CallSignatureDeclaration, typeParameters: NodeArray<TypeParameterDeclaration> | undefined, parameters: NodeArray<ParameterDeclaration>, type: TypeNode | undefined): CallSignatureDeclaration;
+    function createConstructSignature(typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined): ConstructSignatureDeclaration;
+    function updateConstructSignature(node: ConstructSignatureDeclaration, typeParameters: NodeArray<TypeParameterDeclaration> | undefined, parameters: NodeArray<ParameterDeclaration>, type: TypeNode | undefined): ConstructSignatureDeclaration;
+    function createIndexSignature(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode): IndexSignatureDeclaration;
+    function updateIndexSignature(node: IndexSignatureDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode): IndexSignatureDeclaration;
+    function createSignatureDeclaration(kind: SyntaxKind, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, typeArguments?: ReadonlyArray<TypeNode> | undefined): SignatureDeclaration;
+    function createKeywordTypeNode(kind: KeywordTypeNode["kind"]): KeywordTypeNode;
+    function createTypePredicateNode(parameterName: Identifier | ThisTypeNode | string, type: TypeNode): TypePredicateNode;
+    function updateTypePredicateNode(node: TypePredicateNode, parameterName: Identifier | ThisTypeNode, type: TypeNode): TypePredicateNode;
+    function createTypeReferenceNode(typeName: string | EntityName, typeArguments: ReadonlyArray<TypeNode> | undefined): TypeReferenceNode;
+    function updateTypeReferenceNode(node: TypeReferenceNode, typeName: EntityName, typeArguments: NodeArray<TypeNode> | undefined): TypeReferenceNode;
+    function createFunctionTypeNode(typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined): FunctionTypeNode;
+    function updateFunctionTypeNode(node: FunctionTypeNode, typeParameters: NodeArray<TypeParameterDeclaration> | undefined, parameters: NodeArray<ParameterDeclaration>, type: TypeNode | undefined): FunctionTypeNode;
+    function createConstructorTypeNode(typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined): ConstructorTypeNode;
+    function updateConstructorTypeNode(node: ConstructorTypeNode, typeParameters: NodeArray<TypeParameterDeclaration> | undefined, parameters: NodeArray<ParameterDeclaration>, type: TypeNode | undefined): ConstructorTypeNode;
+    function createTypeQueryNode(exprName: EntityName): TypeQueryNode;
+    function updateTypeQueryNode(node: TypeQueryNode, exprName: EntityName): TypeQueryNode;
+    function createTypeLiteralNode(members: ReadonlyArray<TypeElement> | undefined): TypeLiteralNode;
+    function updateTypeLiteralNode(node: TypeLiteralNode, members: NodeArray<TypeElement>): TypeLiteralNode;
+    function createArrayTypeNode(elementType: TypeNode): ArrayTypeNode;
+    function updateArrayTypeNode(node: ArrayTypeNode, elementType: TypeNode): ArrayTypeNode;
+    function createTupleTypeNode(elementTypes: ReadonlyArray<TypeNode>): TupleTypeNode;
+    function updateTypleTypeNode(node: TupleTypeNode, elementTypes: ReadonlyArray<TypeNode>): TupleTypeNode;
+    function createUnionTypeNode(types: ReadonlyArray<TypeNode>): UnionTypeNode;
+    function updateUnionTypeNode(node: UnionTypeNode, types: NodeArray<TypeNode>): UnionTypeNode;
+    function createIntersectionTypeNode(types: ReadonlyArray<TypeNode>): IntersectionTypeNode;
+    function updateIntersectionTypeNode(node: IntersectionTypeNode, types: NodeArray<TypeNode>): IntersectionTypeNode;
+    function createUnionOrIntersectionTypeNode(kind: SyntaxKind.UnionType | SyntaxKind.IntersectionType, types: ReadonlyArray<TypeNode>): UnionTypeNode | IntersectionTypeNode;
+    function createConditionalTypeNode(checkType: TypeNode, extendsType: TypeNode, trueType: TypeNode, falseType: TypeNode): ConditionalTypeNode;
+    function updateConditionalTypeNode(node: ConditionalTypeNode, checkType: TypeNode, extendsType: TypeNode, trueType: TypeNode, falseType: TypeNode): ConditionalTypeNode;
+    function createInferTypeNode(typeParameter: TypeParameterDeclaration): InferTypeNode;
+    function updateInferTypeNode(node: InferTypeNode, typeParameter: TypeParameterDeclaration): InferTypeNode;
+    function createImportTypeNode(argument: TypeNode, qualifier?: EntityName, typeArguments?: ReadonlyArray<TypeNode>, isTypeOf?: boolean): ImportTypeNode;
+    function updateImportTypeNode(node: ImportTypeNode, argument: TypeNode, qualifier?: EntityName, typeArguments?: ReadonlyArray<TypeNode>, isTypeOf?: boolean): ImportTypeNode;
+    function createParenthesizedType(type: TypeNode): ParenthesizedTypeNode;
+    function updateParenthesizedType(node: ParenthesizedTypeNode, type: TypeNode): ParenthesizedTypeNode;
+    function createThisTypeNode(): ThisTypeNode;
+    function createTypeOperatorNode(type: TypeNode): TypeOperatorNode;
+    function createTypeOperatorNode(operator: SyntaxKind.KeyOfKeyword | SyntaxKind.UniqueKeyword, type: TypeNode): TypeOperatorNode;
+    function updateTypeOperatorNode(node: TypeOperatorNode, type: TypeNode): TypeOperatorNode;
+    function createIndexedAccessTypeNode(objectType: TypeNode, indexType: TypeNode): IndexedAccessTypeNode;
+    function updateIndexedAccessTypeNode(node: IndexedAccessTypeNode, objectType: TypeNode, indexType: TypeNode): IndexedAccessTypeNode;
+    function createMappedTypeNode(readonlyToken: ReadonlyToken | PlusToken | MinusToken | undefined, typeParameter: TypeParameterDeclaration, questionToken: QuestionToken | PlusToken | MinusToken | undefined, type: TypeNode | undefined): MappedTypeNode;
+    function updateMappedTypeNode(node: MappedTypeNode, readonlyToken: ReadonlyToken | PlusToken | MinusToken | undefined, typeParameter: TypeParameterDeclaration, questionToken: QuestionToken | PlusToken | MinusToken | undefined, type: TypeNode | undefined): MappedTypeNode;
+    function createLiteralTypeNode(literal: LiteralTypeNode["literal"]): LiteralTypeNode;
+    function updateLiteralTypeNode(node: LiteralTypeNode, literal: LiteralTypeNode["literal"]): LiteralTypeNode;
+    function createObjectBindingPattern(elements: ReadonlyArray<BindingElement>): ObjectBindingPattern;
+    function updateObjectBindingPattern(node: ObjectBindingPattern, elements: ReadonlyArray<BindingElement>): ObjectBindingPattern;
+    function createArrayBindingPattern(elements: ReadonlyArray<ArrayBindingElement>): ArrayBindingPattern;
+    function updateArrayBindingPattern(node: ArrayBindingPattern, elements: ReadonlyArray<ArrayBindingElement>): ArrayBindingPattern;
+    function createBindingElement(dotDotDotToken: DotDotDotToken | undefined, propertyName: string | PropertyName | undefined, name: string | BindingName, initializer?: Expression): BindingElement;
+    function updateBindingElement(node: BindingElement, dotDotDotToken: DotDotDotToken | undefined, propertyName: PropertyName | undefined, name: BindingName, initializer: Expression | undefined): BindingElement;
+    function createArrayLiteral(elements?: ReadonlyArray<Expression>, multiLine?: boolean): ArrayLiteralExpression;
+    function updateArrayLiteral(node: ArrayLiteralExpression, elements: ReadonlyArray<Expression>): ArrayLiteralExpression;
+    function createObjectLiteral(properties?: ReadonlyArray<ObjectLiteralElementLike>, multiLine?: boolean): ObjectLiteralExpression;
+    function updateObjectLiteral(node: ObjectLiteralExpression, properties: ReadonlyArray<ObjectLiteralElementLike>): ObjectLiteralExpression;
+    function createPropertyAccess(expression: Expression, name: string | Identifier | undefined): PropertyAccessExpression;
+    function updatePropertyAccess(node: PropertyAccessExpression, expression: Expression, name: Identifier): PropertyAccessExpression;
+    function createElementAccess(expression: Expression, index: number | Expression): ElementAccessExpression;
+    function updateElementAccess(node: ElementAccessExpression, expression: Expression, argumentExpression: Expression): ElementAccessExpression;
+    function createCall(expression: Expression, typeArguments: ReadonlyArray<TypeNode> | undefined, argumentsArray: ReadonlyArray<Expression> | undefined): CallExpression;
+    function updateCall(node: CallExpression, expression: Expression, typeArguments: ReadonlyArray<TypeNode> | undefined, argumentsArray: ReadonlyArray<Expression>): CallExpression;
+    function createNew(expression: Expression, typeArguments: ReadonlyArray<TypeNode> | undefined, argumentsArray: ReadonlyArray<Expression> | undefined): NewExpression;
+    function updateNew(node: NewExpression, expression: Expression, typeArguments: ReadonlyArray<TypeNode> | undefined, argumentsArray: ReadonlyArray<Expression> | undefined): NewExpression;
+    function createTaggedTemplate(tag: Expression, template: TemplateLiteral): TaggedTemplateExpression;
+    function createTaggedTemplate(tag: Expression, typeArguments: ReadonlyArray<TypeNode> | undefined, template: TemplateLiteral): TaggedTemplateExpression;
+    /** @internal */
+    function createTaggedTemplate(tag: Expression, typeArgumentsOrTemplate: ReadonlyArray<TypeNode> | TemplateLiteral | undefined, template?: TemplateLiteral): TaggedTemplateExpression;
+    function updateTaggedTemplate(node: TaggedTemplateExpression, tag: Expression, template: TemplateLiteral): TaggedTemplateExpression;
+    function updateTaggedTemplate(node: TaggedTemplateExpression, tag: Expression, typeArguments: ReadonlyArray<TypeNode> | undefined, template: TemplateLiteral): TaggedTemplateExpression;
+    function createTypeAssertion(type: TypeNode, expression: Expression): TypeAssertion;
+    function updateTypeAssertion(node: TypeAssertion, type: TypeNode, expression: Expression): TypeAssertion;
+    function createParen(expression: Expression): ParenthesizedExpression;
+    function updateParen(node: ParenthesizedExpression, expression: Expression): ParenthesizedExpression;
+    function createFunctionExpression(modifiers: ReadonlyArray<Modifier> | undefined, asteriskToken: AsteriskToken | undefined, name: string | Identifier | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration> | undefined, type: TypeNode | undefined, body: Block): FunctionExpression;
+    function updateFunctionExpression(node: FunctionExpression, modifiers: ReadonlyArray<Modifier> | undefined, asteriskToken: AsteriskToken | undefined, name: Identifier | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, body: Block): FunctionExpression;
+    function createArrowFunction(modifiers: ReadonlyArray<Modifier> | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, equalsGreaterThanToken: EqualsGreaterThanToken | undefined, body: ConciseBody): ArrowFunction;
+    function updateArrowFunction(node: ArrowFunction, modifiers: ReadonlyArray<Modifier> | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, body: ConciseBody): ArrowFunction;
+    function updateArrowFunction(node: ArrowFunction, modifiers: ReadonlyArray<Modifier> | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, equalsGreaterThanToken: Token<SyntaxKind.EqualsGreaterThanToken>, body: ConciseBody): ArrowFunction;
+    function createDelete(expression: Expression): DeleteExpression;
+    function updateDelete(node: DeleteExpression, expression: Expression): DeleteExpression;
+    function createTypeOf(expression: Expression): TypeOfExpression;
+    function updateTypeOf(node: TypeOfExpression, expression: Expression): TypeOfExpression;
+    function createVoid(expression: Expression): VoidExpression;
+    function updateVoid(node: VoidExpression, expression: Expression): VoidExpression;
+    function createAwait(expression: Expression): AwaitExpression;
+    function updateAwait(node: AwaitExpression, expression: Expression): AwaitExpression;
+    function createPrefix(operator: PrefixUnaryOperator, operand: Expression): PrefixUnaryExpression;
+    function updatePrefix(node: PrefixUnaryExpression, operand: Expression): PrefixUnaryExpression;
+    function createPostfix(operand: Expression, operator: PostfixUnaryOperator): PostfixUnaryExpression;
+    function updatePostfix(node: PostfixUnaryExpression, operand: Expression): PostfixUnaryExpression;
+    function createBinary(left: Expression, operator: BinaryOperator | BinaryOperatorToken, right: Expression): BinaryExpression;
+    function updateBinary(node: BinaryExpression, left: Expression, right: Expression, operator?: BinaryOperator | BinaryOperatorToken): BinaryExpression;
+    function createConditional(condition: Expression, whenTrue: Expression, whenFalse: Expression): ConditionalExpression;
+    function createConditional(condition: Expression, questionToken: QuestionToken, whenTrue: Expression, colonToken: ColonToken, whenFalse: Expression): ConditionalExpression;
+    function updateConditional(node: ConditionalExpression, condition: Expression, whenTrue: Expression, whenFalse: Expression): ConditionalExpression;
+    function updateConditional(node: ConditionalExpression, condition: Expression, questionToken: Token<SyntaxKind.QuestionToken>, whenTrue: Expression, colonToken: Token<SyntaxKind.ColonToken>, whenFalse: Expression): ConditionalExpression;
+    function createTemplateExpression(head: TemplateHead, templateSpans: ReadonlyArray<TemplateSpan>): TemplateExpression;
+    function updateTemplateExpression(node: TemplateExpression, head: TemplateHead, templateSpans: ReadonlyArray<TemplateSpan>): TemplateExpression;
+    function createTemplateHead(text: string): TemplateHead;
+    function createTemplateMiddle(text: string): TemplateMiddle;
+    function createTemplateTail(text: string): TemplateTail;
+    function createNoSubstitutionTemplateLiteral(text: string): NoSubstitutionTemplateLiteral;
+    function createYield(expression?: Expression): YieldExpression;
+    function createYield(asteriskToken: AsteriskToken | undefined, expression: Expression): YieldExpression;
+    function updateYield(node: YieldExpression, asteriskToken: AsteriskToken | undefined, expression: Expression): YieldExpression;
+    function createSpread(expression: Expression): SpreadElement;
+    function updateSpread(node: SpreadElement, expression: Expression): SpreadElement;
+    function createClassExpression(modifiers: ReadonlyArray<Modifier> | undefined, name: string | Identifier | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, heritageClauses: ReadonlyArray<HeritageClause> | undefined, members: ReadonlyArray<ClassElement>): ClassExpression;
+    function updateClassExpression(node: ClassExpression, modifiers: ReadonlyArray<Modifier> | undefined, name: Identifier | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, heritageClauses: ReadonlyArray<HeritageClause> | undefined, members: ReadonlyArray<ClassElement>): ClassExpression;
+    function createOmittedExpression(): OmittedExpression;
+    function createExpressionWithTypeArguments(typeArguments: ReadonlyArray<TypeNode> | undefined, expression: Expression): ExpressionWithTypeArguments;
+    function updateExpressionWithTypeArguments(node: ExpressionWithTypeArguments, typeArguments: ReadonlyArray<TypeNode> | undefined, expression: Expression): ExpressionWithTypeArguments;
+    function createAsExpression(expression: Expression, type: TypeNode): AsExpression;
+    function updateAsExpression(node: AsExpression, expression: Expression, type: TypeNode): AsExpression;
+    function createNonNullExpression(expression: Expression): NonNullExpression;
+    function updateNonNullExpression(node: NonNullExpression, expression: Expression): NonNullExpression;
+    function createMetaProperty(keywordToken: MetaProperty["keywordToken"], name: Identifier): MetaProperty;
+    function updateMetaProperty(node: MetaProperty, name: Identifier): MetaProperty;
+    function createTemplateSpan(expression: Expression, literal: TemplateMiddle | TemplateTail): TemplateSpan;
+    function updateTemplateSpan(node: TemplateSpan, expression: Expression, literal: TemplateMiddle | TemplateTail): TemplateSpan;
+    function createSemicolonClassElement(): SemicolonClassElement;
+    function createBlock(statements: ReadonlyArray<Statement>, multiLine?: boolean): Block;
+    function createExpressionStatement(expression: Expression): ExpressionStatement;
+    function updateBlock(node: Block, statements: ReadonlyArray<Statement>): Block;
+    function createVariableStatement(modifiers: ReadonlyArray<Modifier> | undefined, declarationList: VariableDeclarationList | ReadonlyArray<VariableDeclaration>): VariableStatement;
+    function updateVariableStatement(node: VariableStatement, modifiers: ReadonlyArray<Modifier> | undefined, declarationList: VariableDeclarationList): VariableStatement;
+    function createEmptyStatement(): EmptyStatement;
+    function createStatement(expression: Expression): ExpressionStatement;
+    function updateStatement(node: ExpressionStatement, expression: Expression): ExpressionStatement;
+    function createIf(expression: Expression, thenStatement: Statement, elseStatement?: Statement): IfStatement;
+    function updateIf(node: IfStatement, expression: Expression, thenStatement: Statement, elseStatement: Statement | undefined): IfStatement;
+    function createDo(statement: Statement, expression: Expression): DoStatement;
+    function updateDo(node: DoStatement, statement: Statement, expression: Expression): DoStatement;
+    function createWhile(expression: Expression, statement: Statement): WhileStatement;
+    function updateWhile(node: WhileStatement, expression: Expression, statement: Statement): WhileStatement;
+    function createFor(initializer: ForInitializer | undefined, condition: Expression | undefined, incrementor: Expression | undefined, statement: Statement): ForStatement;
+    function updateFor(node: ForStatement, initializer: ForInitializer | undefined, condition: Expression | undefined, incrementor: Expression | undefined, statement: Statement): ForStatement;
+    function createForIn(initializer: ForInitializer, expression: Expression, statement: Statement): ForInStatement;
+    function updateForIn(node: ForInStatement, initializer: ForInitializer, expression: Expression, statement: Statement): ForInStatement;
+    function createForOf(awaitModifier: AwaitKeywordToken | undefined, initializer: ForInitializer, expression: Expression, statement: Statement): ForOfStatement;
+    function updateForOf(node: ForOfStatement, awaitModifier: AwaitKeywordToken | undefined, initializer: ForInitializer, expression: Expression, statement: Statement): ForOfStatement;
+    function createContinue(label?: string | Identifier): ContinueStatement;
+    function updateContinue(node: ContinueStatement, label: Identifier | undefined): ContinueStatement;
+    function createBreak(label?: string | Identifier): BreakStatement;
+    function updateBreak(node: BreakStatement, label: Identifier | undefined): BreakStatement;
+    function createReturn(expression?: Expression): ReturnStatement;
+    function updateReturn(node: ReturnStatement, expression: Expression | undefined): ReturnStatement;
+    function createWith(expression: Expression, statement: Statement): WithStatement;
+    function updateWith(node: WithStatement, expression: Expression, statement: Statement): WithStatement;
+    function createSwitch(expression: Expression, caseBlock: CaseBlock): SwitchStatement;
+    function updateSwitch(node: SwitchStatement, expression: Expression, caseBlock: CaseBlock): SwitchStatement;
+    function createLabel(label: string | Identifier, statement: Statement): LabeledStatement;
+    function updateLabel(node: LabeledStatement, label: Identifier, statement: Statement): LabeledStatement;
+    function createThrow(expression: Expression): ThrowStatement;
+    function updateThrow(node: ThrowStatement, expression: Expression): ThrowStatement;
+    function createTry(tryBlock: Block, catchClause: CatchClause | undefined, finallyBlock: Block | undefined): TryStatement;
+    function updateTry(node: TryStatement, tryBlock: Block, catchClause: CatchClause | undefined, finallyBlock: Block | undefined): TryStatement;
+    function createDebuggerStatement(): DebuggerStatement;
+    function createVariableDeclaration(name: string | BindingName, type?: TypeNode, initializer?: Expression): VariableDeclaration;
+    function updateVariableDeclaration(node: VariableDeclaration, name: BindingName, type: TypeNode | undefined, initializer: Expression | undefined): VariableDeclaration;
+    function createVariableDeclarationList(declarations: ReadonlyArray<VariableDeclaration>, flags?: NodeFlags): VariableDeclarationList;
+    function updateVariableDeclarationList(node: VariableDeclarationList, declarations: ReadonlyArray<VariableDeclaration>): VariableDeclarationList;
+    function createFunctionDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, asteriskToken: AsteriskToken | undefined, name: string | Identifier | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, body: Block | undefined): FunctionDeclaration;
+    function updateFunctionDeclaration(node: FunctionDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, asteriskToken: AsteriskToken | undefined, name: Identifier | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, body: Block | undefined): FunctionDeclaration;
+    function createClassDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | Identifier | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, heritageClauses: ReadonlyArray<HeritageClause> | undefined, members: ReadonlyArray<ClassElement>): ClassDeclaration;
+    function updateClassDeclaration(node: ClassDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: Identifier | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, heritageClauses: ReadonlyArray<HeritageClause> | undefined, members: ReadonlyArray<ClassElement>): ClassDeclaration;
+    function createInterfaceDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | Identifier, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, heritageClauses: ReadonlyArray<HeritageClause> | undefined, members: ReadonlyArray<TypeElement>): InterfaceDeclaration;
+    function updateInterfaceDeclaration(node: InterfaceDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: Identifier, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, heritageClauses: ReadonlyArray<HeritageClause> | undefined, members: ReadonlyArray<TypeElement>): InterfaceDeclaration;
+    function createTypeAliasDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | Identifier, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, type: TypeNode): TypeAliasDeclaration;
+    function updateTypeAliasDeclaration(node: TypeAliasDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: Identifier, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, type: TypeNode): TypeAliasDeclaration;
+    function createEnumDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | Identifier, members: ReadonlyArray<EnumMember>): EnumDeclaration;
+    function updateEnumDeclaration(node: EnumDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: Identifier, members: ReadonlyArray<EnumMember>): EnumDeclaration;
+    function createModuleDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: ModuleName, body: ModuleBody | undefined, flags?: NodeFlags): ModuleDeclaration;
+    function updateModuleDeclaration(node: ModuleDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: ModuleName, body: ModuleBody | undefined): ModuleDeclaration;
+    function createModuleBlock(statements: ReadonlyArray<Statement>): ModuleBlock;
+    function updateModuleBlock(node: ModuleBlock, statements: ReadonlyArray<Statement>): ModuleBlock;
+    function createCaseBlock(clauses: ReadonlyArray<CaseOrDefaultClause>): CaseBlock;
+    function updateCaseBlock(node: CaseBlock, clauses: ReadonlyArray<CaseOrDefaultClause>): CaseBlock;
+    function createNamespaceExportDeclaration(name: string | Identifier): NamespaceExportDeclaration;
+    function updateNamespaceExportDeclaration(node: NamespaceExportDeclaration, name: Identifier): NamespaceExportDeclaration;
+    function createImportEqualsDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | Identifier, moduleReference: ModuleReference): ImportEqualsDeclaration;
+    function updateImportEqualsDeclaration(node: ImportEqualsDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: Identifier, moduleReference: ModuleReference): ImportEqualsDeclaration;
+    function createImportDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, importClause: ImportClause | undefined, moduleSpecifier: Expression): ImportDeclaration;
+    function updateImportDeclaration(node: ImportDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, importClause: ImportClause | undefined, moduleSpecifier: Expression): ImportDeclaration;
+    function createImportClause(name: Identifier | undefined, namedBindings: NamedImportBindings | undefined): ImportClause;
+    function updateImportClause(node: ImportClause, name: Identifier | undefined, namedBindings: NamedImportBindings | undefined): ImportClause;
+    function createNamespaceImport(name: Identifier): NamespaceImport;
+    function updateNamespaceImport(node: NamespaceImport, name: Identifier): NamespaceImport;
+    function createNamedImports(elements: ReadonlyArray<ImportSpecifier>): NamedImports;
+    function updateNamedImports(node: NamedImports, elements: ReadonlyArray<ImportSpecifier>): NamedImports;
+    function createImportSpecifier(propertyName: Identifier | undefined, name: Identifier): ImportSpecifier;
+    function updateImportSpecifier(node: ImportSpecifier, propertyName: Identifier | undefined, name: Identifier): ImportSpecifier;
+    function createExportAssignment(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, isExportEquals: boolean | undefined, expression: Expression): ExportAssignment;
+    function updateExportAssignment(node: ExportAssignment, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, expression: Expression): ExportAssignment;
+    function createExportDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, exportClause: NamedExports | undefined, moduleSpecifier?: Expression): ExportDeclaration;
+    function updateExportDeclaration(node: ExportDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, exportClause: NamedExports | undefined, moduleSpecifier: Expression | undefined): ExportDeclaration;
+    function createNamedExports(elements: ReadonlyArray<ExportSpecifier>): NamedExports;
+    function updateNamedExports(node: NamedExports, elements: ReadonlyArray<ExportSpecifier>): NamedExports;
+    function createExportSpecifier(propertyName: string | Identifier | undefined, name: string | Identifier): ExportSpecifier;
+    function updateExportSpecifier(node: ExportSpecifier, propertyName: Identifier | undefined, name: Identifier): ExportSpecifier;
+    function createExternalModuleReference(expression: Expression): ExternalModuleReference;
+    function updateExternalModuleReference(node: ExternalModuleReference, expression: Expression): ExternalModuleReference;
+    function createJsxElement(openingElement: JsxOpeningElement, children: ReadonlyArray<JsxChild>, closingElement: JsxClosingElement): JsxElement;
+    function updateJsxElement(node: JsxElement, openingElement: JsxOpeningElement, children: ReadonlyArray<JsxChild>, closingElement: JsxClosingElement): JsxElement;
+    function createJsxSelfClosingElement(tagName: JsxTagNameExpression, typeArguments: ReadonlyArray<TypeNode> | undefined, attributes: JsxAttributes): JsxSelfClosingElement;
+    function updateJsxSelfClosingElement(node: JsxSelfClosingElement, tagName: JsxTagNameExpression, typeArguments: ReadonlyArray<TypeNode> | undefined, attributes: JsxAttributes): JsxSelfClosingElement;
+    function createJsxOpeningElement(tagName: JsxTagNameExpression, typeArguments: ReadonlyArray<TypeNode> | undefined, attributes: JsxAttributes): JsxOpeningElement;
+    function updateJsxOpeningElement(node: JsxOpeningElement, tagName: JsxTagNameExpression, typeArguments: ReadonlyArray<TypeNode> | undefined, attributes: JsxAttributes): JsxOpeningElement;
+    function createJsxClosingElement(tagName: JsxTagNameExpression): JsxClosingElement;
+    function updateJsxClosingElement(node: JsxClosingElement, tagName: JsxTagNameExpression): JsxClosingElement;
+    function createJsxFragment(openingFragment: JsxOpeningFragment, children: ReadonlyArray<JsxChild>, closingFragment: JsxClosingFragment): JsxFragment;
+    function updateJsxFragment(node: JsxFragment, openingFragment: JsxOpeningFragment, children: ReadonlyArray<JsxChild>, closingFragment: JsxClosingFragment): JsxFragment;
+    function createJsxAttribute(name: Identifier, initializer: StringLiteral | JsxExpression): JsxAttribute;
+    function updateJsxAttribute(node: JsxAttribute, name: Identifier, initializer: StringLiteral | JsxExpression): JsxAttribute;
+    function createJsxAttributes(properties: ReadonlyArray<JsxAttributeLike>): JsxAttributes;
+    function updateJsxAttributes(node: JsxAttributes, properties: ReadonlyArray<JsxAttributeLike>): JsxAttributes;
+    function createJsxSpreadAttribute(expression: Expression): JsxSpreadAttribute;
+    function updateJsxSpreadAttribute(node: JsxSpreadAttribute, expression: Expression): JsxSpreadAttribute;
+    function createJsxExpression(dotDotDotToken: DotDotDotToken | undefined, expression: Expression | undefined): JsxExpression;
+    function updateJsxExpression(node: JsxExpression, expression: Expression | undefined): JsxExpression;
+    function createCaseClause(expression: Expression, statements: ReadonlyArray<Statement>): CaseClause;
+    function updateCaseClause(node: CaseClause, expression: Expression, statements: ReadonlyArray<Statement>): CaseClause;
+    function createDefaultClause(statements: ReadonlyArray<Statement>): DefaultClause;
+    function updateDefaultClause(node: DefaultClause, statements: ReadonlyArray<Statement>): DefaultClause;
+    function createHeritageClause(token: HeritageClause["token"], types: ReadonlyArray<ExpressionWithTypeArguments>): HeritageClause;
+    function updateHeritageClause(node: HeritageClause, types: ReadonlyArray<ExpressionWithTypeArguments>): HeritageClause;
+    function createCatchClause(variableDeclaration: string | VariableDeclaration | undefined, block: Block): CatchClause;
+    function updateCatchClause(node: CatchClause, variableDeclaration: VariableDeclaration | undefined, block: Block): CatchClause;
+    function createPropertyAssignment(name: string | PropertyName, initializer: Expression): PropertyAssignment;
+    function updatePropertyAssignment(node: PropertyAssignment, name: PropertyName, initializer: Expression): PropertyAssignment;
+    function createShorthandPropertyAssignment(name: string | Identifier, objectAssignmentInitializer?: Expression): ShorthandPropertyAssignment;
+    function updateShorthandPropertyAssignment(node: ShorthandPropertyAssignment, name: Identifier, objectAssignmentInitializer: Expression | undefined): ShorthandPropertyAssignment;
+    function createSpreadAssignment(expression: Expression): SpreadAssignment;
+    function updateSpreadAssignment(node: SpreadAssignment, expression: Expression): SpreadAssignment;
+    function createEnumMember(name: string | PropertyName, initializer?: Expression): EnumMember;
+    function updateEnumMember(node: EnumMember, name: PropertyName, initializer: Expression | undefined): EnumMember;
+    function updateSourceFileNode(node: SourceFile, statements: ReadonlyArray<Statement>, isDeclarationFile?: boolean, referencedFiles?: SourceFile["referencedFiles"], typeReferences?: SourceFile["typeReferenceDirectives"], hasNoDefaultLib?: boolean, libReferences?: SourceFile["libReferenceDirectives"]): SourceFile;
+    /**
+     * Creates a shallow, memberwise clone of a node for mutation.
+     */
+    function getMutableClone<T extends Node>(node: T): T;
+    /**
+     * Creates a synthetic statement to act as a placeholder for a not-emitted statement in
+     * order to preserve comments.
+     *
+     * @param original The original statement.
+     */
+    function createNotEmittedStatement(original: Node): NotEmittedStatement;
+    /**
+     * Creates a synthetic element to act as a placeholder for the end of an emitted declaration in
+     * order to properly emit exports.
+     */
+    function createEndOfDeclarationMarker(original: Node): EndOfDeclarationMarker;
+    /**
+     * Creates a synthetic element to act as a placeholder for the beginning of a merged declaration in
+     * order to properly emit exports.
+     */
+    function createMergeDeclarationMarker(original: Node): MergeDeclarationMarker;
+    /**
+     * Creates a synthetic expression to act as a placeholder for a not-emitted expression in
+     * order to preserve comments or sourcemap positions.
+     *
+     * @param expression The inner expression to emit.
+     * @param original The original outer expression.
+     * @param location The location for the expression. Defaults to the positions from "original" if provided.
+     */
+    function createPartiallyEmittedExpression(expression: Expression, original?: Node): PartiallyEmittedExpression;
+    function updatePartiallyEmittedExpression(node: PartiallyEmittedExpression, expression: Expression): PartiallyEmittedExpression;
+    function createCommaList(elements: ReadonlyArray<Expression>): CommaListExpression;
+    function updateCommaList(node: CommaListExpression, elements: ReadonlyArray<Expression>): CommaListExpression;
+    function createBundle(sourceFiles: ReadonlyArray<SourceFile>, prepends?: ReadonlyArray<UnparsedSource | InputFiles>): Bundle;
+    function createUnparsedSourceFile(text: string, map?: string): UnparsedSource;
+    function createInputFiles(javascript: string, declaration: string, javascriptMapText?: string, declarationMapText?: string): InputFiles;
+    function updateBundle(node: Bundle, sourceFiles: ReadonlyArray<SourceFile>, prepends?: ReadonlyArray<UnparsedSource>): Bundle;
+    function createImmediatelyInvokedFunctionExpression(statements: ReadonlyArray<Statement>): CallExpression;
+    function createImmediatelyInvokedFunctionExpression(statements: ReadonlyArray<Statement>, param: ParameterDeclaration, paramValue: Expression): CallExpression;
+    function createImmediatelyInvokedArrowFunction(statements: ReadonlyArray<Statement>): CallExpression;
+    function createImmediatelyInvokedArrowFunction(statements: ReadonlyArray<Statement>, param: ParameterDeclaration, paramValue: Expression): CallExpression;
+    function createComma(left: Expression, right: Expression): Expression;
+    function createLessThan(left: Expression, right: Expression): Expression;
+    function createAssignment(left: ObjectLiteralExpression | ArrayLiteralExpression, right: Expression): DestructuringAssignment;
+    function createAssignment(left: Expression, right: Expression): BinaryExpression;
+    function createStrictEquality(left: Expression, right: Expression): BinaryExpression;
+    function createStrictInequality(left: Expression, right: Expression): BinaryExpression;
+    function createAdd(left: Expression, right: Expression): BinaryExpression;
+    function createSubtract(left: Expression, right: Expression): BinaryExpression;
+    function createPostfixIncrement(operand: Expression): PostfixUnaryExpression;
+    function createLogicalAnd(left: Expression, right: Expression): BinaryExpression;
+    function createLogicalOr(left: Expression, right: Expression): BinaryExpression;
+    function createLogicalNot(operand: Expression): PrefixUnaryExpression;
+    function createVoidZero(): VoidExpression;
+    function createExportDefault(expression: Expression): ExportAssignment;
+    function createExternalModuleExport(exportName: Identifier): ExportDeclaration;
+    /**
+     * Clears any EmitNode entries from parse-tree nodes.
+     * @param sourceFile A source file.
+     */
+    function disposeEmitNodes(sourceFile: SourceFile): void;
+    /**
+     * Associates a node with the current transformation, initializing
+     * various transient transformation properties.
+     */
+    function getOrCreateEmitNode(node: Node): EmitNode;
+    function setTextRange<T extends TextRange>(range: T, location: TextRange | undefined): T;
+    /**
+     * Sets flags that control emit behavior of a node.
+     */
+    function setEmitFlags<T extends Node>(node: T, emitFlags: EmitFlags): T;
+    /**
+     * Sets flags that control emit behavior of a node.
+     */
+    function addEmitFlags<T extends Node>(node: T, emitFlags: EmitFlags): T;
+    /**
+     * Gets a custom text range to use when emitting source maps.
+     */
+    function getSourceMapRange(node: Node): SourceMapRange;
+    /**
+     * Sets a custom text range to use when emitting source maps.
+     */
+    function setSourceMapRange<T extends Node>(node: T, range: SourceMapRange | undefined): T;
+    /**
+     * Create an external source map source file reference
+     */
+    function createSourceMapSource(fileName: string, text: string, skipTrivia?: (pos: number) => number): SourceMapSource;
+    /**
+     * Gets the TextRange to use for source maps for a token of a node.
+     */
+    function getTokenSourceMapRange(node: Node, token: SyntaxKind): SourceMapRange | undefined;
+    /**
+     * Sets the TextRange to use for source maps for a token of a node.
+     */
+    function setTokenSourceMapRange<T extends Node>(node: T, token: SyntaxKind, range: SourceMapRange | undefined): T;
+    /**
+     * Gets a custom text range to use when emitting comments.
+     */
+    function getStartsOnNewLine(node: Node): boolean | undefined;
+    /**
+     * Sets a custom text range to use when emitting comments.
+     */
+    function setStartsOnNewLine<T extends Node>(node: T, newLine: boolean): T;
+    /**
+     * Gets a custom text range to use when emitting comments.
+     */
+    function getCommentRange(node: Node): TextRange;
+    /**
+     * Sets a custom text range to use when emitting comments.
+     */
+    function setCommentRange<T extends Node>(node: T, range: TextRange): T;
+    function getSyntheticLeadingComments(node: Node): SynthesizedComment[] | undefined;
+    function setSyntheticLeadingComments<T extends Node>(node: T, comments: SynthesizedComment[] | undefined): T;
+    function addSyntheticLeadingComment<T extends Node>(node: T, kind: SyntaxKind.SingleLineCommentTrivia | SyntaxKind.MultiLineCommentTrivia, text: string, hasTrailingNewLine?: boolean): T;
+    function getSyntheticTrailingComments(node: Node): SynthesizedComment[] | undefined;
+    function setSyntheticTrailingComments<T extends Node>(node: T, comments: SynthesizedComment[] | undefined): T;
+    function addSyntheticTrailingComment<T extends Node>(node: T, kind: SyntaxKind.SingleLineCommentTrivia | SyntaxKind.MultiLineCommentTrivia, text: string, hasTrailingNewLine?: boolean): T;
+    function moveSyntheticComments<T extends Node>(node: T, original: Node): T;
+    /**
+     * Gets the constant value to emit for an expression.
+     */
+    function getConstantValue(node: PropertyAccessExpression | ElementAccessExpression): string | number | undefined;
+    /**
+     * Sets the constant value to emit for an expression.
+     */
+    function setConstantValue(node: PropertyAccessExpression | ElementAccessExpression, value: string | number): PropertyAccessExpression | ElementAccessExpression;
+    /**
+     * Adds an EmitHelper to a node.
+     */
+    function addEmitHelper<T extends Node>(node: T, helper: EmitHelper): T;
+    /**
+     * Add EmitHelpers to a node.
+     */
+    function addEmitHelpers<T extends Node>(node: T, helpers: EmitHelper[] | undefined): T;
+    /**
+     * Removes an EmitHelper from a node.
+     */
+    function removeEmitHelper(node: Node, helper: EmitHelper): boolean;
+    /**
+     * Gets the EmitHelpers of a node.
+     */
+    function getEmitHelpers(node: Node): EmitHelper[] | undefined;
+    /**
+     * Moves matching emit helpers from a source node to a target node.
+     */
+    function moveEmitHelpers(source: Node, target: Node, predicate: (helper: EmitHelper) => boolean): void;
+    function compareEmitHelpers(x: EmitHelper, y: EmitHelper): Comparison;
+    function setOriginalNode<T extends Node>(node: T, original: Node | undefined): T;
+}
+declare namespace ts {
+    const nullTransformationContext: TransformationContext;
+    type TypeOfTag = "undefined" | "number" | "boolean" | "string" | "symbol" | "object" | "function";
+    function createTypeCheck(value: Expression, tag: TypeOfTag): BinaryExpression;
+    function createMemberAccessForPropertyName(target: Expression, memberName: PropertyName, location?: TextRange): MemberExpression;
+    function createFunctionCall(func: Expression, thisArg: Expression, argumentsList: ReadonlyArray<Expression>, location?: TextRange): CallExpression;
+    function createFunctionApply(func: Expression, thisArg: Expression, argumentsExpression: Expression, location?: TextRange): CallExpression;
+    function createArraySlice(array: Expression, start?: number | Expression): CallExpression;
+    function createArrayConcat(array: Expression, values: ReadonlyArray<Expression>): CallExpression;
+    function createMathPow(left: Expression, right: Expression, location?: TextRange): CallExpression;
+    function createExpressionForJsxElement(jsxFactoryEntity: EntityName | undefined, reactNamespace: string, tagName: Expression, props: Expression, children: ReadonlyArray<Expression>, parentElement: JsxOpeningLikeElement, location: TextRange): LeftHandSideExpression;
+    function createExpressionForJsxFragment(jsxFactoryEntity: EntityName | undefined, reactNamespace: string, children: ReadonlyArray<Expression>, parentElement: JsxOpeningFragment, location: TextRange): LeftHandSideExpression;
+    function getHelperName(name: string): Identifier;
+    function createValuesHelper(context: TransformationContext, expression: Expression, location?: TextRange): CallExpression;
+    function createReadHelper(context: TransformationContext, iteratorRecord: Expression, count: number | undefined, location?: TextRange): CallExpression;
+    function createSpreadHelper(context: TransformationContext, argumentList: ReadonlyArray<Expression>, location?: TextRange): CallExpression;
+    function createForOfBindingStatement(node: ForInitializer, boundValue: Expression): Statement;
+    function insertLeadingStatement(dest: Statement, source: Statement): Block;
+    function restoreEnclosingLabel(node: Statement, outermostLabeledStatement: LabeledStatement | undefined, afterRestoreLabelCallback?: (node: LabeledStatement) => void): Statement;
+    interface CallBinding {
+        target: LeftHandSideExpression;
+        thisArg: Expression;
+    }
+    function createCallBinding(expression: Expression, recordTempVariable: (temp: Identifier) => void, languageVersion?: ScriptTarget, cacheIdentifiers?: boolean): CallBinding;
+    function inlineExpressions(expressions: ReadonlyArray<Expression>): Expression;
+    function createExpressionFromEntityName(node: EntityName | Expression): Expression;
+    function createExpressionForPropertyName(memberName: PropertyName): Expression;
+    function createExpressionForObjectLiteralElementLike(node: ObjectLiteralExpression, property: ObjectLiteralElementLike, receiver: Expression): Expression | undefined;
+    /**
+     * Gets the internal name of a declaration. This is primarily used for declarations that can be
+     * referred to by name in the body of an ES5 class function body. An internal name will *never*
+     * be prefixed with an module or namespace export modifier like "exports." when emitted as an
+     * expression. An internal name will also *never* be renamed due to a collision with a block
+     * scoped variable.
+     *
+     * @param node The declaration.
+     * @param allowComments A value indicating whether comments may be emitted for the name.
+     * @param allowSourceMaps A value indicating whether source maps may be emitted for the name.
+     */
+    function getInternalName(node: Declaration, allowComments?: boolean, allowSourceMaps?: boolean): Identifier;
+    /**
+     * Gets whether an identifier should only be referred to by its internal name.
+     */
+    function isInternalName(node: Identifier): boolean;
+    /**
+     * Gets the local name of a declaration. This is primarily used for declarations that can be
+     * referred to by name in the declaration's immediate scope (classes, enums, namespaces). A
+     * local name will *never* be prefixed with an module or namespace export modifier like
+     * "exports." when emitted as an expression.
+     *
+     * @param node The declaration.
+     * @param allowComments A value indicating whether comments may be emitted for the name.
+     * @param allowSourceMaps A value indicating whether source maps may be emitted for the name.
+     */
+    function getLocalName(node: Declaration, allowComments?: boolean, allowSourceMaps?: boolean): Identifier;
+    /**
+     * Gets whether an identifier should only be referred to by its local name.
+     */
+    function isLocalName(node: Identifier): boolean;
+    /**
+     * Gets the export name of a declaration. This is primarily used for declarations that can be
+     * referred to by name in the declaration's immediate scope (classes, enums, namespaces). An
+     * export name will *always* be prefixed with an module or namespace export modifier like
+     * `"exports."` when emitted as an expression if the name points to an exported symbol.
+     *
+     * @param node The declaration.
+     * @param allowComments A value indicating whether comments may be emitted for the name.
+     * @param allowSourceMaps A value indicating whether source maps may be emitted for the name.
+     */
+    function getExportName(node: Declaration, allowComments?: boolean, allowSourceMaps?: boolean): Identifier;
+    /**
+     * Gets whether an identifier should only be referred to by its export representation if the
+     * name points to an exported symbol.
+     */
+    function isExportName(node: Identifier): boolean;
+    /**
+     * Gets the name of a declaration for use in declarations.
+     *
+     * @param node The declaration.
+     * @param allowComments A value indicating whether comments may be emitted for the name.
+     * @param allowSourceMaps A value indicating whether source maps may be emitted for the name.
+     */
+    function getDeclarationName(node: Declaration, allowComments?: boolean, allowSourceMaps?: boolean): Identifier;
+    /**
+     * Gets the exported name of a declaration for use in expressions.
+     *
+     * An exported name will *always* be prefixed with an module or namespace export modifier like
+     * "exports." if the name points to an exported symbol.
+     *
+     * @param ns The namespace identifier.
+     * @param node The declaration.
+     * @param allowComments A value indicating whether comments may be emitted for the name.
+     * @param allowSourceMaps A value indicating whether source maps may be emitted for the name.
+     */
+    function getExternalModuleOrNamespaceExportName(ns: Identifier | undefined, node: Declaration, allowComments?: boolean, allowSourceMaps?: boolean): Identifier | PropertyAccessExpression;
+    /**
+     * Gets a namespace-qualified name for use in expressions.
+     *
+     * @param ns The namespace identifier.
+     * @param name The name.
+     * @param allowComments A value indicating whether comments may be emitted for the name.
+     * @param allowSourceMaps A value indicating whether source maps may be emitted for the name.
+     */
+    function getNamespaceMemberName(ns: Identifier, name: Identifier, allowComments?: boolean, allowSourceMaps?: boolean): PropertyAccessExpression;
+    function convertToFunctionBody(node: ConciseBody, multiLine?: boolean): Block;
+    function convertFunctionDeclarationToExpression(node: FunctionDeclaration): FunctionExpression;
+    /**
+     * Add any necessary prologue-directives into target statement-array.
+     * The function needs to be called during each transformation step.
+     * This function needs to be called whenever we transform the statement
+     * list of a source file, namespace, or function-like body.
+     *
+     * @param target: result statements array
+     * @param source: origin statements array
+     * @param ensureUseStrict: boolean determining whether the function need to add prologue-directives
+     * @param visitor: Optional callback used to visit any custom prologue directives.
+     */
+    function addPrologue(target: Statement[], source: ReadonlyArray<Statement>, ensureUseStrict?: boolean, visitor?: (node: Node) => VisitResult<Node>): number;
+    /**
+     * Add just the standard (string-expression) prologue-directives into target statement-array.
+     * The function needs to be called during each transformation step.
+     * This function needs to be called whenever we transform the statement
+     * list of a source file, namespace, or function-like body.
+     */
+    function addStandardPrologue(target: Statement[], source: ReadonlyArray<Statement>, ensureUseStrict?: boolean): number;
+    /**
+     * Add just the custom prologue-directives into target statement-array.
+     * The function needs to be called during each transformation step.
+     * This function needs to be called whenever we transform the statement
+     * list of a source file, namespace, or function-like body.
+     */
+    function addCustomPrologue(target: Statement[], source: ReadonlyArray<Statement>, statementOffset: number, visitor?: (node: Node) => VisitResult<Node>): number;
+    function addCustomPrologue(target: Statement[], source: ReadonlyArray<Statement>, statementOffset: number | undefined, visitor?: (node: Node) => VisitResult<Node>): number | undefined;
+    function startsWithUseStrict(statements: ReadonlyArray<Statement>): boolean;
+    /**
+     * Ensures "use strict" directive is added
+     *
+     * @param statements An array of statements
+     */
+    function ensureUseStrict(statements: NodeArray<Statement>): NodeArray<Statement>;
+    /**
+     * Wraps the operand to a BinaryExpression in parentheses if they are needed to preserve the intended
+     * order of operations.
+     *
+     * @param binaryOperator The operator for the BinaryExpression.
+     * @param operand The operand for the BinaryExpression.
+     * @param isLeftSideOfBinary A value indicating whether the operand is the left side of the
+     *                           BinaryExpression.
+     */
+    function parenthesizeBinaryOperand(binaryOperator: SyntaxKind, operand: Expression, isLeftSideOfBinary: boolean, leftOperand?: Expression): Expression;
+    function parenthesizeForConditionalHead(condition: Expression): Expression;
+    function parenthesizeSubexpressionOfConditionalExpression(e: Expression): Expression;
+    /**
+     *  [Per the spec](https://tc39.github.io/ecma262/#prod-ExportDeclaration), `export default` accepts _AssigmentExpression_ but
+     *  has a lookahead restriction for `function`, `async function`, and `class`.
+     *
+     * Basically, that means we need to parenthesize in the following cases:
+     *
+     * - BinaryExpression of CommaToken
+     * - CommaList (synthetic list of multiple comma expressions)
+     * - FunctionExpression
+     * - ClassExpression
+     */
+    function parenthesizeDefaultExpression(e: Expression): Expression;
+    /**
+     * Wraps an expression in parentheses if it is needed in order to use the expression
+     * as the expression of a NewExpression node.
+     *
+     * @param expression The Expression node.
+     */
+    function parenthesizeForNew(expression: Expression): LeftHandSideExpression;
+    /**
+     * Wraps an expression in parentheses if it is needed in order to use the expression for
+     * property or element access.
+     *
+     * @param expr The expression node.
+     */
+    function parenthesizeForAccess(expression: Expression): LeftHandSideExpression;
+    function parenthesizePostfixOperand(operand: Expression): LeftHandSideExpression;
+    function parenthesizePrefixOperand(operand: Expression): UnaryExpression;
+    function parenthesizeListElements(elements: NodeArray<Expression>): NodeArray<Expression>;
+    function parenthesizeExpressionForList(expression: Expression): Expression;
+    function parenthesizeExpressionForExpressionStatement(expression: Expression): Expression;
+    function parenthesizeConditionalTypeMember(member: TypeNode): TypeNode;
+    function parenthesizeElementTypeMember(member: TypeNode): TypeNode;
+    function parenthesizeArrayTypeMember(member: TypeNode): TypeNode;
+    function parenthesizeElementTypeMembers(members: ReadonlyArray<TypeNode>): NodeArray<TypeNode>;
+    function parenthesizeTypeParameters(typeParameters: ReadonlyArray<TypeNode> | undefined): MutableNodeArray<TypeNode> | undefined;
+    function parenthesizeConciseBody(body: ConciseBody): ConciseBody;
+    enum OuterExpressionKinds {
+        Parentheses = 1,
+        Assertions = 2,
+        PartiallyEmittedExpressions = 4,
+        All = 7
+    }
+    type OuterExpression = ParenthesizedExpression | TypeAssertion | AsExpression | NonNullExpression | PartiallyEmittedExpression;
+    function isOuterExpression(node: Node, kinds?: OuterExpressionKinds): node is OuterExpression;
+    function skipOuterExpressions(node: Expression, kinds?: OuterExpressionKinds): Expression;
+    function skipOuterExpressions(node: Node, kinds?: OuterExpressionKinds): Node;
+    function skipAssertions(node: Expression): Expression;
+    function skipAssertions(node: Node): Node;
+    function recreateOuterExpressions(outerExpression: Expression | undefined, innerExpression: Expression, kinds?: OuterExpressionKinds): Expression;
+    function startOnNewLine<T extends Node>(node: T): T;
+    function getExternalHelpersModuleName(node: SourceFile): Identifier | undefined;
+    function getOrCreateExternalHelpersModuleNameIfNeeded(node: SourceFile, compilerOptions: CompilerOptions, hasExportStarsToExportValues?: boolean, hasImportStarOrImportDefault?: boolean): Identifier | undefined;
+    /**
+     * Get the name of that target module from an import or export declaration
+     */
+    function getLocalNameForExternalImport(node: ImportDeclaration | ExportDeclaration | ImportEqualsDeclaration, sourceFile: SourceFile): Identifier | undefined;
+    /**
+     * Get the name of a target module from an import/export declaration as should be written in the emitted output.
+     * The emitted output name can be different from the input if:
+     *  1. The module has a /// <amd-module name="<new name>" />
+     *  2. --out or --outFile is used, making the name relative to the rootDir
+     *  3- The containing SourceFile has an entry in renamedDependencies for the import as requested by some module loaders (e.g. System).
+     * Otherwise, a new StringLiteral node representing the module name will be returned.
+     */
+    function getExternalModuleNameLiteral(importNode: ImportDeclaration | ExportDeclaration | ImportEqualsDeclaration, sourceFile: SourceFile, host: EmitHost, resolver: EmitResolver, compilerOptions: CompilerOptions): StringLiteral | undefined;
+    /**
+     * Get the name of a module as should be written in the emitted output.
+     * The emitted output name can be different from the input if:
+     *  1. The module has a /// <amd-module name="<new name>" />
+     *  2. --out or --outFile is used, making the name relative to the rootDir
+     * Otherwise, a new StringLiteral node representing the module name will be returned.
+     */
+    function tryGetModuleNameFromFile(file: SourceFile | undefined, host: EmitHost, options: CompilerOptions): StringLiteral | undefined;
+    /**
+     * Gets the initializer of an BindingOrAssignmentElement.
+     */
+    function getInitializerOfBindingOrAssignmentElement(bindingElement: BindingOrAssignmentElement): Expression | undefined;
+    /**
+     * Gets the name of an BindingOrAssignmentElement.
+     */
+    function getTargetOfBindingOrAssignmentElement(bindingElement: BindingOrAssignmentElement): BindingOrAssignmentElementTarget | undefined;
+    /**
+     * Determines whether an BindingOrAssignmentElement is a rest element.
+     */
+    function getRestIndicatorOfBindingOrAssignmentElement(bindingElement: BindingOrAssignmentElement): BindingOrAssignmentElementRestIndicator | undefined;
+    /**
+     * Gets the property name of a BindingOrAssignmentElement
+     */
+    function getPropertyNameOfBindingOrAssignmentElement(bindingElement: BindingOrAssignmentElement): Identifier | StringLiteral | NumericLiteral | ComputedPropertyName | undefined;
+    /**
+     * Gets the elements of a BindingOrAssignmentPattern
+     */
+    function getElementsOfBindingOrAssignmentPattern(name: BindingOrAssignmentPattern): ReadonlyArray<BindingOrAssignmentElement>;
+    function convertToArrayAssignmentElement(element: BindingOrAssignmentElement): Expression;
+    function convertToObjectAssignmentElement(element: BindingOrAssignmentElement): ObjectLiteralElementLike;
+    function convertToAssignmentPattern(node: BindingOrAssignmentPattern): AssignmentPattern;
+    function convertToObjectAssignmentPattern(node: ObjectBindingOrAssignmentPattern): ObjectLiteralExpression;
+    function convertToArrayAssignmentPattern(node: ArrayBindingOrAssignmentPattern): ArrayLiteralExpression;
+    function convertToAssignmentElementTarget(node: BindingOrAssignmentElementTarget): Expression;
+}
+declare namespace ts {
+    /**
+     * Visits a Node using the supplied visitor, possibly returning a new Node in its place.
+     *
+     * @param node The Node to visit.
+     * @param visitor The callback used to visit the Node.
+     * @param test A callback to execute to verify the Node is valid.
+     * @param lift An optional callback to execute to lift a NodeArray into a valid Node.
+     */
+    function visitNode<T extends Node>(node: T | undefined, visitor: Visitor | undefined, test?: (node: Node) => boolean, lift?: (node: NodeArray<Node>) => T): T;
+    /**
+     * Visits a Node using the supplied visitor, possibly returning a new Node in its place.
+     *
+     * @param node The Node to visit.
+     * @param visitor The callback used to visit the Node.
+     * @param test A callback to execute to verify the Node is valid.
+     * @param lift An optional callback to execute to lift a NodeArray into a valid Node.
+     */
+    function visitNode<T extends Node>(node: T | undefined, visitor: Visitor | undefined, test?: (node: Node) => boolean, lift?: (node: NodeArray<Node>) => T): T | undefined;
+    /**
+     * Visits a NodeArray using the supplied visitor, possibly returning a new NodeArray in its place.
+     *
+     * @param nodes The NodeArray to visit.
+     * @param visitor The callback used to visit a Node.
+     * @param test A node test to execute for each node.
+     * @param start An optional value indicating the starting offset at which to start visiting.
+     * @param count An optional value indicating the maximum number of nodes to visit.
+     */
+    function visitNodes<T extends Node>(nodes: NodeArray<T> | undefined, visitor: Visitor, test?: (node: Node) => boolean, start?: number, count?: number): NodeArray<T>;
+    /**
+     * Visits a NodeArray using the supplied visitor, possibly returning a new NodeArray in its place.
+     *
+     * @param nodes The NodeArray to visit.
+     * @param visitor The callback used to visit a Node.
+     * @param test A node test to execute for each node.
+     * @param start An optional value indicating the starting offset at which to start visiting.
+     * @param count An optional value indicating the maximum number of nodes to visit.
+     */
+    function visitNodes<T extends Node>(nodes: NodeArray<T> | undefined, visitor: Visitor, test?: (node: Node) => boolean, start?: number, count?: number): NodeArray<T> | undefined;
+    /**
+     * Starts a new lexical environment and visits a statement list, ending the lexical environment
+     * and merging hoisted declarations upon completion.
+     */
+    function visitLexicalEnvironment(statements: NodeArray<Statement>, visitor: Visitor, context: TransformationContext, start?: number, ensureUseStrict?: boolean): NodeArray<Statement>;
+    /**
+     * Starts a new lexical environment and visits a parameter list, suspending the lexical
+     * environment upon completion.
+     */
+    function visitParameterList(nodes: NodeArray<ParameterDeclaration> | undefined, visitor: Visitor, context: TransformationContext, nodesVisitor?: typeof visitNodes): NodeArray<ParameterDeclaration>;
+    /**
+     * Resumes a suspended lexical environment and visits a function body, ending the lexical
+     * environment and merging hoisted declarations upon completion.
+     */
+    function visitFunctionBody(node: FunctionBody, visitor: Visitor, context: TransformationContext): FunctionBody;
+    /**
+     * Resumes a suspended lexical environment and visits a function body, ending the lexical
+     * environment and merging hoisted declarations upon completion.
+     */
+    function visitFunctionBody(node: FunctionBody | undefined, visitor: Visitor, context: TransformationContext): FunctionBody | undefined;
+    /**
+     * Resumes a suspended lexical environment and visits a concise body, ending the lexical
+     * environment and merging hoisted declarations upon completion.
+     */
+    function visitFunctionBody(node: ConciseBody, visitor: Visitor, context: TransformationContext): ConciseBody;
+    /**
+     * Visits each child of a Node using the supplied visitor, possibly returning a new Node of the same kind in its place.
+     *
+     * @param node The Node whose children will be visited.
+     * @param visitor The callback used to visit each child.
+     * @param context A lexical environment context for the visitor.
+     */
+    function visitEachChild<T extends Node>(node: T, visitor: Visitor, context: TransformationContext): T;
+    /**
+     * Visits each child of a Node using the supplied visitor, possibly returning a new Node of the same kind in its place.
+     *
+     * @param node The Node whose children will be visited.
+     * @param visitor The callback used to visit each child.
+     * @param context A lexical environment context for the visitor.
+     */
+    function visitEachChild<T extends Node>(node: T | undefined, visitor: Visitor, context: TransformationContext, nodesVisitor?: typeof visitNodes, tokenVisitor?: Visitor): T | undefined;
+}
+declare namespace ts {
+    /**
+     * Similar to `reduceLeft`, performs a reduction against each child of a node.
+     * NOTE: Unlike `forEachChild`, this does *not* visit every node.
+     *
+     * @param node The node containing the children to reduce.
+     * @param initial The initial value to supply to the reduction.
+     * @param f The callback function
+     */
+    function reduceEachChild<T>(node: Node | undefined, initial: T, cbNode: (memo: T, node: Node) => T, cbNodeArray?: (memo: T, nodes: NodeArray<Node>) => T): T;
+    /**
+     * Merges generated lexical declarations into a new statement list.
+     */
+    function mergeLexicalEnvironment(statements: NodeArray<Statement>, declarations: ReadonlyArray<Statement> | undefined): NodeArray<Statement>;
+    /**
+     * Appends generated lexical declarations to an array of statements.
+     */
+    function mergeLexicalEnvironment(statements: Statement[], declarations: ReadonlyArray<Statement> | undefined): Statement[];
+    /**
+     * Lifts a NodeArray containing only Statement nodes to a block.
+     *
+     * @param nodes The NodeArray.
+     */
+    function liftToBlock(nodes: ReadonlyArray<Node>): Statement;
+    /**
+     * Aggregates the TransformFlags for a Node and its subtree.
+     */
+    function aggregateTransformFlags<T extends Node>(node: T): T;
+    namespace Debug {
+        function failBadSyntaxKind(node: Node, message?: string): never;
+        const assertEachNode: (nodes: Node[], test: (node: Node) => boolean, message?: string | undefined) => void;
+        const assertNode: (node: Node | undefined, test: ((node: Node | undefined) => boolean) | undefined, message?: string | undefined) => void;
+        const assertOptionalNode: (node: Node, test: (node: Node) => boolean, message?: string | undefined) => void;
+        const assertOptionalToken: (node: Node, kind: SyntaxKind, message?: string | undefined) => void;
+        const assertMissingNode: typeof noop;
+        /**
+         * Injects debug information into frequently used types.
+         */
+        function enableDebugInfo(): void;
+    }
+}
+declare namespace ts {
+    function getOriginalNodeId(node: Node): number;
+    interface ExternalModuleInfo {
+        externalImports: (ImportDeclaration | ImportEqualsDeclaration | ExportDeclaration)[];
+        externalHelpersImportDeclaration: ImportDeclaration | undefined;
+        exportSpecifiers: Map<ExportSpecifier[]>;
+        exportedBindings: Identifier[][];
+        exportedNames: Identifier[] | undefined;
+        exportEquals: ExportAssignment | undefined;
+        hasExportStarsToExportValues: boolean;
+    }
+    function chainBundle(transformSourceFile: (x: SourceFile) => SourceFile): (x: SourceFile | Bundle) => SourceFile | Bundle;
+    function getImportNeedsImportStarHelper(node: ImportDeclaration): boolean;
+    function getImportNeedsImportDefaultHelper(node: ImportDeclaration): boolean;
+    function collectExternalModuleInfo(sourceFile: SourceFile, resolver: EmitResolver, compilerOptions: CompilerOptions): ExternalModuleInfo;
+    /**
+     * Used in the module transformer to check if an expression is reasonably without sideeffect,
+     *  and thus better to copy into multiple places rather than to cache in a temporary variable
+     *  - this is mostly subjective beyond the requirement that the expression not be sideeffecting
+     */
+    function isSimpleCopiableExpression(expression: Expression): boolean;
+    /**
+     * @param input Template string input strings
+     * @param args Names which need to be made file-level unique
+     */
+    function helperString(input: TemplateStringsArray, ...args: string[]): (uniqueName: EmitHelperUniqueNameCallback) => string;
+}
+declare namespace ts {
+    enum FlattenLevel {
+        All = 0,
+        ObjectRest = 1
+    }
+    /**
+     * Flattens a DestructuringAssignment or a VariableDeclaration to an expression.
+     *
+     * @param node The node to flatten.
+     * @param visitor An optional visitor used to visit initializers.
+     * @param context The transformation context.
+     * @param level Indicates the extent to which flattening should occur.
+     * @param needsValue An optional value indicating whether the value from the right-hand-side of
+     * the destructuring assignment is needed as part of a larger expression.
+     * @param createAssignmentCallback An optional callback used to create the assignment expression.
+     */
+    function flattenDestructuringAssignment(node: VariableDeclaration | DestructuringAssignment, visitor: ((node: Node) => VisitResult<Node>) | undefined, context: TransformationContext, level: FlattenLevel, needsValue?: boolean, createAssignmentCallback?: (name: Identifier, value: Expression, location?: TextRange) => Expression): Expression;
+    /**
+     * Flattens a VariableDeclaration or ParameterDeclaration to one or more variable declarations.
+     *
+     * @param node The node to flatten.
+     * @param visitor An optional visitor used to visit initializers.
+     * @param context The transformation context.
+     * @param boundValue The value bound to the declaration.
+     * @param skipInitializer A value indicating whether to ignore the initializer of `node`.
+     * @param hoistTempVariables Indicates whether temporary variables should not be recorded in-line.
+     * @param level Indicates the extent to which flattening should occur.
+     */
+    function flattenDestructuringBinding(node: VariableDeclaration | ParameterDeclaration, visitor: (node: Node) => VisitResult<Node>, context: TransformationContext, level: FlattenLevel, rval?: Expression, hoistTempVariables?: boolean, skipInitializer?: boolean): VariableDeclaration[];
+}
+declare namespace ts {
+    function transformTypeScript(context: TransformationContext): (node: SourceFile | Bundle) => SourceFile | Bundle;
+}
+declare namespace ts {
+    function transformES2017(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle;
+    const asyncSuperHelper: EmitHelper;
+    const advancedAsyncSuperHelper: EmitHelper;
+}
+declare namespace ts {
+    function transformESNext(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle;
+    function createAssignHelper(context: TransformationContext, attributesSegments: Expression[]): CallExpression;
+}
+declare namespace ts {
+    function transformJsx(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle;
+}
+declare namespace ts {
+    function transformES2016(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle;
+}
+declare namespace ts {
+    function transformES2015(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle;
+}
+declare namespace ts {
+    /**
+     * Transforms ES5 syntax into ES3 syntax.
+     *
+     * @param context Context and state information for the transformation.
+     */
+    function transformES5(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle;
+}
+declare namespace ts {
+    function transformGenerators(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle;
+}
+declare namespace ts {
+    function transformModule(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle;
+}
+declare namespace ts {
+    function transformSystemModule(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle;
+}
+declare namespace ts {
+    function transformES2015Module(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle;
+}
+declare namespace ts {
+    type GetSymbolAccessibilityDiagnostic = (symbolAccessibilityResult: SymbolAccessibilityResult) => (SymbolAccessibilityDiagnostic | undefined);
+    interface SymbolAccessibilityDiagnostic {
+        errorNode: Node;
+        diagnosticMessage: DiagnosticMessage;
+        typeName?: DeclarationName | QualifiedName;
+    }
+    type DeclarationDiagnosticProducing = VariableDeclaration | PropertyDeclaration | PropertySignature | BindingElement | SetAccessorDeclaration | GetAccessorDeclaration | ConstructSignatureDeclaration | CallSignatureDeclaration | MethodDeclaration | MethodSignature | FunctionDeclaration | ParameterDeclaration | TypeParameterDeclaration | ExpressionWithTypeArguments | ImportEqualsDeclaration | TypeAliasDeclaration | ConstructorDeclaration | IndexSignatureDeclaration;
+    function canProduceDiagnostics(node: Node): node is DeclarationDiagnosticProducing;
+    function createGetSymbolAccessibilityDiagnosticForNodeName(node: DeclarationDiagnosticProducing): (symbolAccessibilityResult: SymbolAccessibilityResult) => SymbolAccessibilityDiagnostic | undefined;
+    function createGetSymbolAccessibilityDiagnosticForNode(node: DeclarationDiagnosticProducing): (symbolAccessibilityResult: SymbolAccessibilityResult) => SymbolAccessibilityDiagnostic | undefined;
+}
+declare namespace ts {
+    function getDeclarationDiagnostics(host: EmitHost, resolver: EmitResolver, file: SourceFile | undefined): DiagnosticWithLocation[] | undefined;
+    /**
+     * Transforms a ts file into a .d.ts file
+     * This process requires type information, which is retrieved through the emit resolver. Because of this,
+     * in many places this transformer assumes it will be operating on parse tree nodes directly.
+     * This means that _no transforms should be allowed to occur before this one_.
+     */
+    function transformDeclarations(context: TransformationContext): {
+        (node: Bundle): Bundle;
+        (node: SourceFile): SourceFile;
+        (node: SourceFile | Bundle): SourceFile | Bundle;
+    };
+}
+declare namespace ts {
+    function getTransformers(compilerOptions: CompilerOptions, customTransformers?: CustomTransformers): TransformerFactory<SourceFile | Bundle>[];
+    /**
+     * Transforms an array of SourceFiles by passing them through each transformer.
+     *
+     * @param resolver The emit resolver provided by the checker.
+     * @param host The emit host object used to interact with the file system.
+     * @param options Compiler options to surface in the `TransformationContext`.
+     * @param nodes An array of nodes to transform.
+     * @param transforms An array of `TransformerFactory` callbacks.
+     * @param allowDtsFiles A value indicating whether to allow the transformation of .d.ts files.
+     */
+    function transformNodes<T extends Node>(resolver: EmitResolver | undefined, host: EmitHost | undefined, options: CompilerOptions, nodes: ReadonlyArray<T>, transformers: ReadonlyArray<TransformerFactory<T>>, allowDtsFiles: boolean): TransformationResult<T>;
+}
+declare namespace ts {
+    interface SourceMapWriter {
+        /**
+         * Initialize the SourceMapWriter for a new output file.
+         *
+         * @param filePath The path to the generated output file.
+         * @param sourceMapFilePath The path to the output source map file.
+         * @param sourceFileOrBundle The input source file or bundle for the program.
+         */
+        initialize(filePath: string, sourceMapFilePath: string | undefined, sourceFileOrBundle: SourceFile | Bundle, sourceMapOutput?: SourceMapData[]): void;
+        /**
+         * Reset the SourceMapWriter to an empty state.
+         */
+        reset(): void;
+        /**
+         * Set the current source file.
+         *
+         * @param sourceFile The source file.
+         */
+        setSourceFile(sourceFile: SourceMapSource): void;
+        /**
+         * Emits a mapping.
+         *
+         * If the position is synthetic (undefined or a negative value), no mapping will be
+         * created.
+         *
+         * @param pos The position.
+         */
+        emitPos(pos: number): void;
+        /**
+         * Emits a node with possible leading and trailing source maps.
+         *
+         * @param hint The current emit context
+         * @param node The node to emit.
+         * @param emitCallback The callback used to emit the node.
+         */
+        emitNodeWithSourceMap(hint: EmitHint, node: Node, emitCallback: (hint: EmitHint, node: Node) => void): void;
+        /**
+         * Emits a token of a node node with possible leading and trailing source maps.
+         *
+         * @param node The node containing the token.
+         * @param token The token to emit.
+         * @param tokenStartPos The start pos of the token.
+         * @param emitCallback The callback used to emit the token.
+         */
+        emitTokenWithSourceMap(node: Node, token: SyntaxKind, writer: (s: string) => void, tokenStartPos: number, emitCallback: (token: SyntaxKind, writer: (s: string) => void, tokenStartPos: number) => number): number;
+        /**
+         * Gets the text for the source map.
+         */
+        getText(): string;
+        /**
+         * Gets the SourceMappingURL for the source map.
+         */
+        getSourceMappingURL(): string;
+    }
+    interface SourceMapOptions {
+        sourceMap?: boolean;
+        inlineSourceMap?: boolean;
+        inlineSources?: boolean;
+        sourceRoot?: string;
+        mapRoot?: string;
+        extendedDiagnostics?: boolean;
+    }
+    function createSourceMapWriter(host: EmitHost, writer: EmitTextWriter, compilerOptions?: SourceMapOptions): SourceMapWriter;
+}
+declare namespace ts {
+    interface CommentWriter {
+        reset(): void;
+        setSourceFile(sourceFile: SourceFile): void;
+        setWriter(writer: EmitTextWriter | undefined): void;
+        emitNodeWithComments(hint: EmitHint, node: Node | undefined, emitCallback: (hint: EmitHint, node: Node) => void): void;
+        emitBodyWithDetachedComments(node: Node, detachedRange: TextRange, emitCallback: (node: Node) => void): void;
+        emitTrailingCommentsOfPosition(pos: number, prefixSpace?: boolean): void;
+        emitLeadingCommentsOfPosition(pos: number): void;
+    }
+    function createCommentWriter(printerOptions: PrinterOptions, emitPos: ((pos: number) => void) | undefined): CommentWriter;
+}
+declare namespace ts {
+    /**
+     * Iterates over the source files that are expected to have an emit output.
+     *
+     * @param host An EmitHost.
+     * @param action The action to execute.
+     * @param sourceFilesOrTargetSourceFile
+     *   If an array, the full list of source files to emit.
+     *   Else, calls `getSourceFilesToEmit` with the (optional) target source file to determine the list of source files to emit.
+     */
+    function forEachEmittedFile<T>(host: EmitHost, action: (emitFileNames: EmitFileNames, sourceFileOrBundle: SourceFile | Bundle) => T, sourceFilesOrTargetSourceFile?: ReadonlyArray<SourceFile> | SourceFile, emitOnlyDtsFiles?: boolean): T | undefined;
+    function getOutputPathsFor(sourceFile: SourceFile | Bundle, host: EmitHost, forceDtsPaths: boolean): EmitFileNames;
+    function getOutputExtension(sourceFile: SourceFile, options: CompilerOptions): Extension;
+    function emitFiles(resolver: EmitResolver, host: EmitHost, targetSourceFile: SourceFile, emitOnlyDtsFiles?: boolean, transformers?: TransformerFactory<Bundle | SourceFile>[], declarationTransformers?: TransformerFactory<Bundle | SourceFile>[]): EmitResult;
+    function createPrinter(printerOptions?: PrinterOptions, handlers?: PrintHandlers): Printer;
+}
+declare namespace ts {
+    /**
+     * Partial interface of the System thats needed to support the caching of directory structure
+     */
+    interface DirectoryStructureHost {
+        fileExists(path: string): boolean;
+        readFile(path: string, encoding?: string): string | undefined;
+        directoryExists?(path: string): boolean;
+        getDirectories?(path: string): string[];
+        readDirectory?(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
+        createDirectory?(path: string): void;
+        writeFile?(path: string, data: string, writeByteOrderMark?: boolean): void;
+    }
+    interface FileAndDirectoryExistence {
+        fileExists: boolean;
+        directoryExists: boolean;
+    }
+    interface CachedDirectoryStructureHost extends DirectoryStructureHost {
+        useCaseSensitiveFileNames: boolean;
+        getDirectories(path: string): string[];
+        readDirectory(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
+        /** Returns the queried result for the file exists and directory exists if at all it was done */
+        addOrDeleteFileOrDirectory(fileOrDirectory: string, fileOrDirectoryPath: Path): FileAndDirectoryExistence | undefined;
+        addOrDeleteFile(fileName: string, filePath: Path, eventKind: FileWatcherEventKind): void;
+        clearCache(): void;
+    }
+    function createCachedDirectoryStructureHost(host: DirectoryStructureHost, currentDirectory: string, useCaseSensitiveFileNames: boolean): CachedDirectoryStructureHost | undefined;
+    enum ConfigFileProgramReloadLevel {
+        None = 0,
+        /** Update the file name list from the disk */
+        Partial = 1,
+        /** Reload completely by re-reading contents of config file from disk and updating program */
+        Full = 2
+    }
+    /**
+     * Updates the existing missing file watches with the new set of missing files after new program is created
+     */
+    function updateMissingFilePathsWatch(program: Program, missingFileWatches: Map<FileWatcher>, createMissingFileWatch: (missingFilePath: Path) => FileWatcher): void;
+    interface WildcardDirectoryWatcher {
+        watcher: FileWatcher;
+        flags: WatchDirectoryFlags;
+    }
+    /**
+     * Updates the existing wild card directory watches with the new set of wild card directories from the config file
+     * after new program is created because the config file was reloaded or program was created first time from the config file
+     * Note that there is no need to call this function when the program is updated with additional files without reloading config files,
+     * as wildcard directories wont change unless reloading config file
+     */
+    function updateWatchingWildcardDirectories(existingWatchedForWildcards: Map<WildcardDirectoryWatcher>, wildcardDirectories: Map<WatchDirectoryFlags>, watchDirectory: (directory: string, flags: WatchDirectoryFlags) => FileWatcher): void;
+    function isEmittedFileOfProgram(program: Program | undefined, file: string): boolean;
+    enum WatchLogLevel {
+        None = 0,
+        TriggerOnly = 1,
+        Verbose = 2
+    }
+    interface WatchFileHost {
+        watchFile(path: string, callback: FileWatcherCallback, pollingInterval?: number): FileWatcher;
+    }
+    interface WatchDirectoryHost {
+        watchDirectory(path: string, callback: DirectoryWatcherCallback, recursive?: boolean): FileWatcher;
+    }
+    type WatchFile<X, Y> = (host: WatchFileHost, file: string, callback: FileWatcherCallback, pollingInterval: PollingInterval, detailInfo1?: X, detailInfo2?: Y) => FileWatcher;
+    type FilePathWatcherCallback = (fileName: string, eventKind: FileWatcherEventKind, filePath: Path) => void;
+    type WatchFilePath<X, Y> = (host: WatchFileHost, file: string, callback: FilePathWatcherCallback, pollingInterval: PollingInterval, path: Path, detailInfo1?: X, detailInfo2?: Y) => FileWatcher;
+    type WatchDirectory<X, Y> = (host: WatchDirectoryHost, directory: string, callback: DirectoryWatcherCallback, flags: WatchDirectoryFlags, detailInfo1?: X, detailInfo2?: Y) => FileWatcher;
+    interface WatchFactory<X, Y> {
+        watchFile: WatchFile<X, Y>;
+        watchFilePath: WatchFilePath<X, Y>;
+        watchDirectory: WatchDirectory<X, Y>;
+    }
+    function getWatchFactory<X, Y = undefined>(watchLogLevel: WatchLogLevel, log: (s: string) => void, getDetailWatchInfo?: GetDetailWatchInfo<X, Y>): WatchFactory<X, Y>;
+    type GetDetailWatchInfo<X, Y> = (detailInfo1: X, detailInfo2: Y | undefined) => string;
+    function closeFileWatcherOf<T extends {
+        watcher: FileWatcher;
+    }>(objWithWatcher: T): void;
+}
+declare namespace ts {
+    function findConfigFile(searchPath: string, fileExists: (fileName: string) => boolean, configName?: string): string | undefined;
+    function resolveTripleslashReference(moduleName: string, containingFile: string): string;
+    function computeCommonSourceDirectoryOfFilenames(fileNames: string[], currentDirectory: string, getCanonicalFileName: GetCanonicalFileName): string;
+    function createCompilerHost(options: CompilerOptions, setParentNodes?: boolean): CompilerHost;
+    function getPreEmitDiagnostics(program: Program, sourceFile?: SourceFile, cancellationToken?: CancellationToken): Diagnostic[];
+    interface FormatDiagnosticsHost {
+        getCurrentDirectory(): string;
+        getCanonicalFileName(fileName: string): string;
+        getNewLine(): string;
+    }
+    function formatDiagnostics(diagnostics: ReadonlyArray<Diagnostic>, host: FormatDiagnosticsHost): string;
+    function formatDiagnostic(diagnostic: Diagnostic, host: FormatDiagnosticsHost): string;
+    /** @internal */
+    enum ForegroundColorEscapeSequences {
+        Grey = "\u001B[90m",
+        Red = "\u001B[91m",
+        Yellow = "\u001B[93m",
+        Blue = "\u001B[94m",
+        Cyan = "\u001B[96m"
+    }
+    /** @internal */
+    function formatColorAndReset(text: string, formatStyle: string): string;
+    function formatDiagnosticsWithColorAndContext(diagnostics: ReadonlyArray<Diagnostic>, host: FormatDiagnosticsHost): string;
+    function flattenDiagnosticMessageText(messageText: string | DiagnosticMessageChain | undefined, newLine: string): string;
+    /**
+     * Determines if program structure is upto date or needs to be recreated
+     */
+    function isProgramUptoDate(program: Program | undefined, rootFileNames: string[], newOptions: CompilerOptions, getSourceVersion: (path: Path) => string | undefined, fileExists: (fileName: string) => boolean, hasInvalidatedResolution: HasInvalidatedResolution, hasChangedAutomaticTypeDirectiveNames: boolean): boolean;
+    function getConfigFileParsingDiagnostics(configFileParseResult: ParsedCommandLine): ReadonlyArray<Diagnostic>;
+    /**
+     * Create a new 'Program' instance. A Program is an immutable collection of 'SourceFile's and a 'CompilerOptions'
+     * that represent a compilation unit.
+     *
+     * Creating a program proceeds from a set of root files, expanding the set of inputs by following imports and
+     * triple-slash-reference-path directives transitively. '@types' and triple-slash-reference-types are also pulled in.
+     *
+     * @param createProgramOptions - The options for creating a program.
+     * @returns A 'Program' object.
+     */
+    function createProgram(createProgramOptions: CreateProgramOptions): Program;
+    /**
+     * Create a new 'Program' instance. A Program is an immutable collection of 'SourceFile's and a 'CompilerOptions'
+     * that represent a compilation unit.
+     *
+     * Creating a program proceeds from a set of root files, expanding the set of inputs by following imports and
+     * triple-slash-reference-path directives transitively. '@types' and triple-slash-reference-types are also pulled in.
+     *
+     * @param rootNames - A set of root files.
+     * @param options - The compiler options which should be used.
+     * @param host - The host interacts with the underlying file system.
+     * @param oldProgram - Reuses an old program structure.
+     * @param configFileParsingDiagnostics - error during config file parsing
+     * @returns A 'Program' object.
+     */
+    function createProgram(rootNames: ReadonlyArray<string>, options: CompilerOptions, host?: CompilerHost, oldProgram?: Program, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>): Program;
+    function parseConfigHostFromCompilerHost(host: CompilerHost): ParseConfigFileHost;
+    /**
+     * Returns the target config filename of a project reference
+     */
+    function resolveProjectReferencePath(host: CompilerHost, ref: ProjectReference): string | undefined;
+    /**
+     * Returns a DiagnosticMessage if we won't include a resolved module due to its extension.
+     * The DiagnosticMessage's parameters are the imported module name, and the filename it resolved to.
+     * This returns a diagnostic even if the module will be an untyped module.
+     */
+    function getResolutionDiagnostic(options: CompilerOptions, { extension }: ResolvedModuleFull): DiagnosticMessage | undefined;
+}
+declare namespace ts {
+    interface EmitOutput {
+        outputFiles: OutputFile[];
+        emitSkipped: boolean;
+    }
+    interface OutputFile {
+        name: string;
+        writeByteOrderMark: boolean;
+        text: string;
+    }
+}
+declare namespace ts {
+    function getFileEmitOutput(program: Program, sourceFile: SourceFile, emitOnlyDtsFiles: boolean, cancellationToken?: CancellationToken, customTransformers?: CustomTransformers): EmitOutput;
+    interface BuilderState {
+        /**
+         * Information of the file eg. its version, signature etc
+         */
+        fileInfos: Map<BuilderState.FileInfo>;
+        /**
+         * Contains the map of ReferencedSet=Referenced files of the file if module emit is enabled
+         * Otherwise undefined
+         * Thus non undefined value indicates, module emit
+         */
+        readonly referencedMap: ReadonlyMap<BuilderState.ReferencedSet> | undefined;
+        /**
+         * Map of files that have already called update signature.
+         * That means hence forth these files are assumed to have
+         * no change in their signature for this version of the program
+         */
+        hasCalledUpdateShapeSignature: Map<true>;
+        /**
+         * Cache of all files excluding default library file for the current program
+         */
+        allFilesExcludingDefaultLibraryFile: ReadonlyArray<SourceFile> | undefined;
+        /**
+         * Cache of all the file names
+         */
+        allFileNames: ReadonlyArray<string> | undefined;
+    }
+}
+declare namespace ts.BuilderState {
+    /**
+     * Information about the source file: Its version and optional signature from last emit
+     */
+    interface FileInfo {
+        readonly version: string;
+        signature: string | undefined;
+    }
+    /**
+     * Referenced files with values for the keys as referenced file's path to be true
+     */
+    type ReferencedSet = ReadonlyMap<true>;
+    /**
+     * Compute the hash to store the shape of the file
+     */
+    type ComputeHash = (data: string) => string;
+    /**
+     * Returns true if oldState is reusable, that is the emitKind = module/non module has not changed
+     */
+    function canReuseOldState(newReferencedMap: ReadonlyMap<ReferencedSet> | undefined, oldState: Readonly<BuilderState> | undefined): boolean | undefined;
+    /**
+     * Creates the state of file references and signature for the new program from oldState if it is safe
+     */
+    function create(newProgram: Program, getCanonicalFileName: GetCanonicalFileName, oldState?: Readonly<BuilderState>): BuilderState;
+    /**
+     * Gets the files affected by the path from the program
+     */
+    function getFilesAffectedBy(state: BuilderState, programOfThisState: Program, path: Path, cancellationToken: CancellationToken | undefined, computeHash: ComputeHash, cacheToUpdateSignature?: Map<string>): ReadonlyArray<SourceFile>;
+    /**
+     * Updates the signatures from the cache into state's fileinfo signatures
+     * This should be called whenever it is safe to commit the state of the builder
+     */
+    function updateSignaturesFromCache(state: BuilderState, signatureCache: Map<string>): void;
+    /**
+     * Get all the dependencies of the sourceFile
+     */
+    function getAllDependencies(state: BuilderState, programOfThisState: Program, sourceFile: SourceFile): ReadonlyArray<string>;
+}
+declare namespace ts {
+    /**
+     * State to store the changed files, affected files and cache semantic diagnostics
+     */
+    interface BuilderProgramState extends BuilderState {
+        /**
+         * Cache of semantic diagnostics for files with their Path being the key
+         */
+        semanticDiagnosticsPerFile: Map<ReadonlyArray<Diagnostic>> | undefined;
+        /**
+         * The map has key by source file's path that has been changed
+         */
+        changedFilesSet: Map<true>;
+        /**
+         * Set of affected files being iterated
+         */
+        affectedFiles: ReadonlyArray<SourceFile> | undefined;
+        /**
+         * Current index to retrieve affected file from
+         */
+        affectedFilesIndex: number | undefined;
+        /**
+         * Current changed file for iterating over affected files
+         */
+        currentChangedFilePath: Path | undefined;
+        /**
+         * Map of file signatures, with key being file path, calculated while getting current changed file's affected files
+         * These will be commited whenever the iteration through affected files of current changed file is complete
+         */
+        currentAffectedFilesSignatures: Map<string> | undefined;
+        /**
+         * Already seen affected files
+         */
+        seenAffectedFiles: Map<true> | undefined;
+        /**
+         * program corresponding to this state
+         */
+        program: Program;
+    }
+    enum BuilderProgramKind {
+        SemanticDiagnosticsBuilderProgram = 0,
+        EmitAndSemanticDiagnosticsBuilderProgram = 1
+    }
+    interface BuilderCreationParameters {
+        newProgram: Program;
+        host: BuilderProgramHost;
+        oldProgram: BuilderProgram | undefined;
+        configFileParsingDiagnostics: ReadonlyArray<Diagnostic>;
+    }
+    function getBuilderCreationParameters(newProgramOrRootNames: Program | ReadonlyArray<string> | undefined, hostOrOptions: BuilderProgramHost | CompilerOptions | undefined, oldProgramOrHost?: BuilderProgram | CompilerHost, configFileParsingDiagnosticsOrOldProgram?: ReadonlyArray<Diagnostic> | BuilderProgram, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>): BuilderCreationParameters;
+    function createBuilderProgram(kind: BuilderProgramKind.SemanticDiagnosticsBuilderProgram, builderCreationParameters: BuilderCreationParameters): SemanticDiagnosticsBuilderProgram;
+    function createBuilderProgram(kind: BuilderProgramKind.EmitAndSemanticDiagnosticsBuilderProgram, builderCreationParameters: BuilderCreationParameters): EmitAndSemanticDiagnosticsBuilderProgram;
+}
+declare namespace ts {
+    type AffectedFileResult<T> = {
+        result: T;
+        affected: SourceFile | Program;
+    } | undefined;
+    interface BuilderProgramHost {
+        /**
+         * return true if file names are treated with case sensitivity
+         */
+        useCaseSensitiveFileNames(): boolean;
+        /**
+         * If provided this would be used this hash instead of actual file shape text for detecting changes
+         */
+        createHash?: (data: string) => string;
+        /**
+         * When emit or emitNextAffectedFile are called without writeFile,
+         * this callback if present would be used to write files
+         */
+        writeFile?: WriteFileCallback;
+    }
+    /**
+     * Builder to manage the program state changes
+     */
+    interface BuilderProgram {
+        getState(): BuilderProgramState;
+        /**
+         * Returns current program
+         */
+        getProgram(): Program;
+        /**
+         * Get compiler options of the program
+         */
+        getCompilerOptions(): CompilerOptions;
+        /**
+         * Get the source file in the program with file name
+         */
+        getSourceFile(fileName: string): SourceFile | undefined;
+        /**
+         * Get a list of files in the program
+         */
+        getSourceFiles(): ReadonlyArray<SourceFile>;
+        /**
+         * Get the diagnostics for compiler options
+         */
+        getOptionsDiagnostics(cancellationToken?: CancellationToken): ReadonlyArray<Diagnostic>;
+        /**
+         * Get the diagnostics that dont belong to any file
+         */
+        getGlobalDiagnostics(cancellationToken?: CancellationToken): ReadonlyArray<Diagnostic>;
+        /**
+         * Get the diagnostics from config file parsing
+         */
+        getConfigFileParsingDiagnostics(): ReadonlyArray<Diagnostic>;
+        /**
+         * Get the syntax diagnostics, for all source files if source file is not supplied
+         */
+        getSyntacticDiagnostics(sourceFile?: SourceFile, cancellationToken?: CancellationToken): ReadonlyArray<Diagnostic>;
+        /**
+         * Get all the dependencies of the file
+         */
+        getAllDependencies(sourceFile: SourceFile): ReadonlyArray<string>;
+        /**
+         * Gets the semantic diagnostics from the program corresponding to this state of file (if provided) or whole program
+         * The semantic diagnostics are cached and managed here
+         * Note that it is assumed that when asked about semantic diagnostics through this API,
+         * the file has been taken out of affected files so it is safe to use cache or get from program and cache the diagnostics
+         * In case of SemanticDiagnosticsBuilderProgram if the source file is not provided,
+         * it will iterate through all the affected files, to ensure that cache stays valid and yet provide a way to get all semantic diagnostics
+         */
+        getSemanticDiagnostics(sourceFile?: SourceFile, cancellationToken?: CancellationToken): ReadonlyArray<Diagnostic>;
+        /**
+         * Emits the JavaScript and declaration files.
+         * When targetSource file is specified, emits the files corresponding to that source file,
+         * otherwise for the whole program.
+         * In case of EmitAndSemanticDiagnosticsBuilderProgram, when targetSourceFile is specified,
+         * it is assumed that that file is handled from affected file list. If targetSourceFile is not specified,
+         * it will only emit all the affected files instead of whole program
+         *
+         * The first of writeFile if provided, writeFile of BuilderProgramHost if provided, writeFile of compiler host
+         * in that order would be used to write the files
+         */
+        emit(targetSourceFile?: SourceFile, writeFile?: WriteFileCallback, cancellationToken?: CancellationToken, emitOnlyDtsFiles?: boolean, customTransformers?: CustomTransformers): EmitResult;
+        /**
+         * Get the current directory of the program
+         */
+        getCurrentDirectory(): string;
+    }
+    /**
+     * The builder that caches the semantic diagnostics for the program and handles the changed files and affected files
+     */
+    interface SemanticDiagnosticsBuilderProgram extends BuilderProgram {
+        /**
+         * Gets the semantic diagnostics from the program for the next affected file and caches it
+         * Returns undefined if the iteration is complete
+         */
+        getSemanticDiagnosticsOfNextAffectedFile(cancellationToken?: CancellationToken, ignoreSourceFile?: (sourceFile: SourceFile) => boolean): AffectedFileResult<ReadonlyArray<Diagnostic>>;
+    }
+    /**
+     * The builder that can handle the changes in program and iterate through changed file to emit the files
+     * The semantic diagnostics are cached per file and managed by clearing for the changed/affected files
+     */
+    interface EmitAndSemanticDiagnosticsBuilderProgram extends BuilderProgram {
+        /**
+         * Emits the next affected file's emit result (EmitResult and sourceFiles emitted) or returns undefined if iteration is complete
+         * The first of writeFile if provided, writeFile of BuilderProgramHost if provided, writeFile of compiler host
+         * in that order would be used to write the files
+         */
+        emitNextAffectedFile(writeFile?: WriteFileCallback, cancellationToken?: CancellationToken, emitOnlyDtsFiles?: boolean, customTransformers?: CustomTransformers): AffectedFileResult<EmitResult>;
+    }
+    /**
+     * Create the builder to manage semantic diagnostics and cache them
+     */
+    function createSemanticDiagnosticsBuilderProgram(newProgram: Program, host: BuilderProgramHost, oldProgram?: SemanticDiagnosticsBuilderProgram, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>): SemanticDiagnosticsBuilderProgram;
+    function createSemanticDiagnosticsBuilderProgram(rootNames: ReadonlyArray<string> | undefined, options: CompilerOptions | undefined, host?: CompilerHost, oldProgram?: SemanticDiagnosticsBuilderProgram, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>): SemanticDiagnosticsBuilderProgram;
+    /**
+     * Create the builder that can handle the changes in program and iterate through changed files
+     * to emit the those files and manage semantic diagnostics cache as well
+     */
+    function createEmitAndSemanticDiagnosticsBuilderProgram(newProgram: Program, host: BuilderProgramHost, oldProgram?: EmitAndSemanticDiagnosticsBuilderProgram, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>): EmitAndSemanticDiagnosticsBuilderProgram;
+    function createEmitAndSemanticDiagnosticsBuilderProgram(rootNames: ReadonlyArray<string> | undefined, options: CompilerOptions | undefined, host?: CompilerHost, oldProgram?: EmitAndSemanticDiagnosticsBuilderProgram, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>): EmitAndSemanticDiagnosticsBuilderProgram;
+    /**
+     * Creates a builder thats just abstraction over program and can be used with watch
+     */
+    function createAbstractBuilder(newProgram: Program, host: BuilderProgramHost, oldProgram?: BuilderProgram, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>): BuilderProgram;
+    function createAbstractBuilder(rootNames: ReadonlyArray<string> | undefined, options: CompilerOptions | undefined, host?: CompilerHost, oldProgram?: BuilderProgram, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>): BuilderProgram;
+}
+declare namespace ts {
+    /** This is the cache of module/typedirectives resolution that can be retained across program */
+    interface ResolutionCache {
+        startRecordingFilesWithChangedResolutions(): void;
+        finishRecordingFilesWithChangedResolutions(): Path[] | undefined;
+        resolveModuleNames(moduleNames: string[], containingFile: string, reusedNames: string[] | undefined): ResolvedModuleFull[];
+        getResolvedModuleWithFailedLookupLocationsFromCache(moduleName: string, containingFile: string): CachedResolvedModuleWithFailedLookupLocations | undefined;
+        resolveTypeReferenceDirectives(typeDirectiveNames: string[], containingFile: string): ResolvedTypeReferenceDirective[];
+        invalidateResolutionOfFile(filePath: Path): void;
+        removeResolutionsOfFile(filePath: Path): void;
+        setFilesWithInvalidatedNonRelativeUnresolvedImports(filesWithUnresolvedImports: Map<ReadonlyArray<string>>): void;
+        createHasInvalidatedResolution(forceAllFilesAsInvalidated?: boolean): HasInvalidatedResolution;
+        startCachingPerDirectoryResolution(): void;
+        finishCachingPerDirectoryResolution(): void;
+        updateTypeRootsWatch(): void;
+        closeTypeRootsWatch(): void;
+        clear(): void;
+    }
+    interface ResolutionWithFailedLookupLocations {
+        readonly failedLookupLocations: ReadonlyArray<string>;
+        isInvalidated?: boolean;
+        refCount?: number;
+    }
+    interface CachedResolvedModuleWithFailedLookupLocations extends ResolvedModuleWithFailedLookupLocations, ResolutionWithFailedLookupLocations {
+    }
+    interface ResolutionCacheHost extends ModuleResolutionHost {
+        toPath(fileName: string): Path;
+        getCanonicalFileName: GetCanonicalFileName;
+        getCompilationSettings(): CompilerOptions;
+        watchDirectoryOfFailedLookupLocation(directory: string, cb: DirectoryWatcherCallback, flags: WatchDirectoryFlags): FileWatcher;
+        onInvalidatedResolution(): void;
+        watchTypeRootsDirectory(directory: string, cb: DirectoryWatcherCallback, flags: WatchDirectoryFlags): FileWatcher;
+        onChangedAutomaticTypeDirectiveNames(): void;
+        getCachedDirectoryStructureHost(): CachedDirectoryStructureHost | undefined;
+        projectName?: string;
+        getGlobalCache?(): string | undefined;
+        writeLog(s: string): void;
+        maxNumberOfFilesToIterateForInvalidation?: number;
+        getCurrentProgram(): Program;
+    }
+    const maxNumberOfFilesToIterateForInvalidation = 256;
+    function createResolutionCache(resolutionHost: ResolutionCacheHost, rootDirForResolution: string | undefined, logChangesWhenResolvingModule: boolean): ResolutionCache;
+}
+declare namespace ts.moduleSpecifiers {
+    interface ModuleSpecifierPreferences {
+        importModuleSpecifierPreference?: "relative" | "non-relative";
+    }
+    function getModuleSpecifier(compilerOptions: CompilerOptions, fromSourceFile: SourceFile, fromSourceFileName: string, toFileName: string, host: ModuleSpecifierResolutionHost, preferences?: ModuleSpecifierPreferences): string;
+    function getModuleSpecifiers(moduleSymbol: Symbol, program: Program, importingSourceFile: SourceFile, host: ModuleSpecifierResolutionHost, preferences: ModuleSpecifierPreferences): ReadonlyArray<ReadonlyArray<string>>;
+}
+declare namespace ts {
+    /**
+     * Create a function that reports error by writing to the system and handles the formating of the diagnostic
+     */
+    function createDiagnosticReporter(system: System, pretty?: boolean): DiagnosticReporter;
+    /** @internal */
+    const nonClearingMessageCodes: number[];
+    /** @internal */
+    const screenStartingMessageCodes: number[];
+    /**
+     * Create a function that reports watch status by writing to the system and handles the formating of the diagnostic
+     */
+    function createWatchStatusReporter(system: System, pretty?: boolean): WatchStatusReporter;
+    /** Parses config file using System interface */
+    function parseConfigFileWithSystem(configFileName: string, optionsToExtend: CompilerOptions, system: System, reportDiagnostic: DiagnosticReporter): ParsedCommandLine | undefined;
+    /**
+     * Program structure needed to emit the files and report diagnostics
+     */
+    interface ProgramToEmitFilesAndReportErrors {
+        getCurrentDirectory(): string;
+        getCompilerOptions(): CompilerOptions;
+        getSourceFiles(): ReadonlyArray<SourceFile>;
+        getSyntacticDiagnostics(): ReadonlyArray<Diagnostic>;
+        getOptionsDiagnostics(): ReadonlyArray<Diagnostic>;
+        getGlobalDiagnostics(): ReadonlyArray<Diagnostic>;
+        getSemanticDiagnostics(): ReadonlyArray<Diagnostic>;
+        getConfigFileParsingDiagnostics(): ReadonlyArray<Diagnostic>;
+        emit(): EmitResult;
+    }
+    type ReportEmitErrorSummary = (errorCount: number) => void;
+    /**
+     * Helper that emit files, report diagnostics and lists emitted and/or source files depending on compiler options
+     */
+    function emitFilesAndReportErrors(program: ProgramToEmitFilesAndReportErrors, reportDiagnostic: DiagnosticReporter, writeFileName?: (s: string) => void, reportSummary?: ReportEmitErrorSummary): ExitStatus;
+    /**
+     * Creates the watch compiler host from system for config file in watch mode
+     */
+    function createWatchCompilerHostOfConfigFile<T extends BuilderProgram = EmitAndSemanticDiagnosticsBuilderProgram>(configFileName: string, optionsToExtend: CompilerOptions | undefined, system: System, createProgram?: CreateProgram<T>, reportDiagnostic?: DiagnosticReporter, reportWatchStatus?: WatchStatusReporter): WatchCompilerHostOfConfigFile<T>;
+    /**
+     * Creates the watch compiler host from system for compiling root files and options in watch mode
+     */
+    function createWatchCompilerHostOfFilesAndCompilerOptions<T extends BuilderProgram = EmitAndSemanticDiagnosticsBuilderProgram>(rootFiles: string[], options: CompilerOptions, system: System, createProgram?: CreateProgram<T>, reportDiagnostic?: DiagnosticReporter, reportWatchStatus?: WatchStatusReporter): WatchCompilerHostOfFilesAndCompilerOptions<T>;
+}
+declare namespace ts {
+    type WatchStatusReporter = (diagnostic: Diagnostic, newLine: string, options: CompilerOptions) => void;
+    /** Create the program with rootNames and options, if they are undefined, oldProgram and new configFile diagnostics create new program */
+    type CreateProgram<T extends BuilderProgram> = (rootNames: ReadonlyArray<string> | undefined, options: CompilerOptions | undefined, host?: CompilerHost, oldProgram?: T, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>) => T;
+    interface WatchCompilerHost<T extends BuilderProgram> {
+        /**
+         * Used to create the program when need for program creation or recreation detected
+         */
+        createProgram: CreateProgram<T>;
+        /** If provided, callback to invoke after every new program creation */
+        afterProgramCreate?(program: T): void;
+        /** If provided, called with Diagnostic message that informs about change in watch status */
+        onWatchStatusChange?(diagnostic: Diagnostic, newLine: string, options: CompilerOptions): void;
+        maxNumberOfFilesToIterateForInvalidation?: number;
+        useCaseSensitiveFileNames(): boolean;
+        getNewLine(): string;
+        getCurrentDirectory(): string;
+        getDefaultLibFileName(options: CompilerOptions): string;
+        getDefaultLibLocation?(): string;
+        createHash?(data: string): string;
+        /**
+         * Use to check file presence for source files and
+         * if resolveModuleNames is not provided (complier is in charge of module resolution) then module files as well
+         */
+        fileExists(path: string): boolean;
+        /**
+         * Use to read file text for source files and
+         * if resolveModuleNames is not provided (complier is in charge of module resolution) then module files as well
+         */
+        readFile(path: string, encoding?: string): string | undefined;
+        /** If provided, used for module resolution as well as to handle directory structure */
+        directoryExists?(path: string): boolean;
+        /** If provided, used in resolutions as well as handling directory structure */
+        getDirectories?(path: string): string[];
+        /** If provided, used to cache and handle directory structure modifications */
+        readDirectory?(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
+        /** Symbol links resolution */
+        realpath?(path: string): string;
+        /** If provided would be used to write log about compilation */
+        trace?(s: string): void;
+        /** If provided is used to get the environment variable */
+        getEnvironmentVariable?(name: string): string | undefined;
+        /** If provided, used to resolve the module names, otherwise typescript's default module resolution */
+        resolveModuleNames?(moduleNames: string[], containingFile: string, reusedNames?: string[]): ResolvedModule[];
+        /** If provided, used to resolve type reference directives, otherwise typescript's default resolution */
+        resolveTypeReferenceDirectives?(typeReferenceDirectiveNames: string[], containingFile: string): ResolvedTypeReferenceDirective[];
+        /** Used to watch changes in source files, missing files needed to update the program or config file */
+        watchFile(path: string, callback: FileWatcherCallback, pollingInterval?: number): FileWatcher;
+        /** Used to watch resolved module's failed lookup locations, config file specs, type roots where auto type reference directives are added */
+        watchDirectory(path: string, callback: DirectoryWatcherCallback, recursive?: boolean): FileWatcher;
+        /** If provided, will be used to set delayed compilation, so that multiple changes in short span are compiled together */
+        setTimeout?(callback: (...args: any[]) => void, ms: number, ...args: any[]): any;
+        /** If provided, will be used to reset existing delayed compilation */
+        clearTimeout?(timeoutId: any): void;
+    }
+    /** Internal interface used to wire emit through same host */
+    interface WatchCompilerHost<T extends BuilderProgram> {
+        createDirectory?(path: string): void;
+        writeFile?(path: string, data: string, writeByteOrderMark?: boolean): void;
+        onCachedDirectoryStructureHostCreate?(host: CachedDirectoryStructureHost): void;
+    }
+    /**
+     * Host to create watch with root files and options
+     */
+    interface WatchCompilerHostOfFilesAndCompilerOptions<T extends BuilderProgram> extends WatchCompilerHost<T> {
+        /** root files to use to generate program */
+        rootFiles: string[];
+        /** Compiler options */
+        options: CompilerOptions;
+    }
+    /**
+     * Host to create watch with config file
+     */
+    interface WatchCompilerHostOfConfigFile<T extends BuilderProgram> extends WatchCompilerHost<T>, ConfigFileDiagnosticsReporter {
+        /** Name of the config file to compile */
+        configFileName: string;
+        /** Options to extend */
+        optionsToExtend?: CompilerOptions;
+        /**
+         * Used to generate source file names from the config file and its include, exclude, files rules
+         * and also to cache the directory stucture
+         */
+        readDirectory(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
+    }
+    /**
+     * Host to create watch with config file that is already parsed (from tsc)
+     */
+    interface WatchCompilerHostOfConfigFile<T extends BuilderProgram> extends WatchCompilerHost<T> {
+        optionsToExtend?: CompilerOptions;
+        configFileParsingResult?: ParsedCommandLine;
+    }
+    interface Watch<T> {
+        /** Synchronize with host and get updated program */
+        getProgram(): T;
+        /** Gets the existing program without synchronizing with changes on host */
+        getCurrentProgram(): T;
+    }
+    /**
+     * Creates the watch what generates program using the config file
+     */
+    interface WatchOfConfigFile<T> extends Watch<T> {
+    }
+    /**
+     * Creates the watch that generates program using the root files and compiler options
+     */
+    interface WatchOfFilesAndCompilerOptions<T> extends Watch<T> {
+        /** Updates the root files in the program, only if this is not config file compilation */
+        updateRootFileNames(fileNames: string[]): void;
+    }
+    /**
+     * Create the watch compiler host for either configFile or fileNames and its options
+     */
+    function createWatchCompilerHost<T extends BuilderProgram>(rootFiles: string[], options: CompilerOptions, system: System, createProgram?: CreateProgram<T>, reportDiagnostic?: DiagnosticReporter, reportWatchStatus?: WatchStatusReporter): WatchCompilerHostOfFilesAndCompilerOptions<T>;
+    function createWatchCompilerHost<T extends BuilderProgram>(configFileName: string, optionsToExtend: CompilerOptions | undefined, system: System, createProgram?: CreateProgram<T>, reportDiagnostic?: DiagnosticReporter, reportWatchStatus?: WatchStatusReporter): WatchCompilerHostOfConfigFile<T>;
+    /**
+     * Creates the watch from the host for root files and compiler options
+     */
+    function createWatchProgram<T extends BuilderProgram>(host: WatchCompilerHostOfFilesAndCompilerOptions<T>): WatchOfFilesAndCompilerOptions<T>;
+    /**
+     * Creates the watch from the host for config file
+     */
+    function createWatchProgram<T extends BuilderProgram>(host: WatchCompilerHostOfConfigFile<T>): WatchOfConfigFile<T>;
+}
+declare namespace ts {
+    /**
+     * Branded string for keeping track of when we've turned an ambiguous path
+     * specified like "./blah" to an absolute path to an actual
+     * tsconfig file, e.g. "/root/blah/tsconfig.json"
+     */
+    type ResolvedConfigFileName = string & {
+        _isResolvedConfigFileName: never;
+    };
+    interface BuildHost {
+        verbose(diag: DiagnosticMessage, ...args: string[]): void;
+        error(diag: DiagnosticMessage, ...args: string[]): void;
+        errorDiagnostic(diag: Diagnostic): void;
+        message(diag: DiagnosticMessage, ...args: string[]): void;
+    }
+    /**
+     * A BuildContext tracks what's going on during the course of a build.
+     *
+     * Callers may invoke any number of build requests within the same context;
+     * until the context is reset, each project will only be built at most once.
+     *
+     * Example: In a standard setup where project B depends on project A, and both are out of date,
+     * a failed build of A will result in A remaining out of date. When we try to build
+     * B, we should immediately bail instead of recomputing A's up-to-date status again.
+     *
+     * This also matters for performing fast (i.e. fake) downstream builds of projects
+     * when their upstream .d.ts files haven't changed content (but have newer timestamps)
+     */
+    interface BuildContext {
+        options: BuildOptions;
+        /**
+         * Map from output file name to its pre-build timestamp
+         */
+        unchangedOutputs: FileMap<Date>;
+        /**
+         * Map from config file name to up-to-date status
+         */
+        projectStatus: FileMap<UpToDateStatus>;
+        invalidatedProjects: FileMap<true>;
+        queuedProjects: FileMap<true>;
+        missingRoots: Map<true>;
+    }
+    type Mapper = ReturnType<typeof createDependencyMapper>;
+    interface DependencyGraph {
+        buildQueue: ResolvedConfigFileName[];
+        dependencyMap: Mapper;
+    }
+    interface BuildOptions {
+        dry: boolean;
+        force: boolean;
+        verbose: boolean;
+    }
+    enum UpToDateStatusType {
+        Unbuildable = 0,
+        UpToDate = 1,
+        /**
+         * The project appears out of date because its upstream inputs are newer than its outputs,
+         * but all of its outputs are actually newer than the previous identical outputs of its (.d.ts) inputs.
+         * This means we can Pseudo-build (just touch timestamps), as if we had actually built this project.
+         */
+        UpToDateWithUpstreamTypes = 2,
+        OutputMissing = 3,
+        OutOfDateWithSelf = 4,
+        OutOfDateWithUpstream = 5,
+        UpstreamOutOfDate = 6,
+        UpstreamBlocked = 7,
+        /**
+         * Projects with no outputs (i.e. "solution" files)
+         */
+        ContainerOnly = 8
+    }
+    type UpToDateStatus = Status.Unbuildable | Status.UpToDate | Status.OutputMissing | Status.OutOfDateWithSelf | Status.OutOfDateWithUpstream | Status.UpstreamOutOfDate | Status.UpstreamBlocked | Status.ContainerOnly;
+    namespace Status {
+        /**
+         * The project can't be built at all in its current state. For example,
+         * its config file cannot be parsed, or it has a syntax error or missing file
+         */
+        interface Unbuildable {
+            type: UpToDateStatusType.Unbuildable;
+            reason: string;
+        }
+        /**
+         * This project doesn't have any outputs, so "is it up to date" is a meaningless question.
+         */
+        interface ContainerOnly {
+            type: UpToDateStatusType.ContainerOnly;
+        }
+        /**
+         * The project is up to date with respect to its inputs.
+         * We track what the newest input file is.
+         */
+        interface UpToDate {
+            type: UpToDateStatusType.UpToDate | UpToDateStatusType.UpToDateWithUpstreamTypes;
+            newestInputFileTime: Date;
+            newestInputFileName: string;
+            newestDeclarationFileContentChangedTime: Date;
+            newestOutputFileTime: Date;
+            newestOutputFileName: string;
+            oldestOutputFileName: string;
+        }
+        /**
+         * One or more of the outputs of the project does not exist.
+         */
+        interface OutputMissing {
+            type: UpToDateStatusType.OutputMissing;
+            /**
+             * The name of the first output file that didn't exist
+             */
+            missingOutputFileName: string;
+        }
+        /**
+         * One or more of the project's outputs is older than its newest input.
+         */
+        interface OutOfDateWithSelf {
+            type: UpToDateStatusType.OutOfDateWithSelf;
+            outOfDateOutputFileName: string;
+            newerInputFileName: string;
+        }
+        /**
+         * This project depends on an out-of-date project, so shouldn't be built yet
+         */
+        interface UpstreamOutOfDate {
+            type: UpToDateStatusType.UpstreamOutOfDate;
+            upstreamProjectName: string;
+        }
+        /**
+         * This project depends an upstream project with build errors
+         */
+        interface UpstreamBlocked {
+            type: UpToDateStatusType.UpstreamBlocked;
+            upstreamProjectName: string;
+        }
+        /**
+         * One or more of the project's outputs is older than the newest output of
+         * an upstream project.
+         */
+        interface OutOfDateWithUpstream {
+            type: UpToDateStatusType.OutOfDateWithUpstream;
+            outOfDateOutputFileName: string;
+            newerProjectName: string;
+        }
+    }
+    interface FileMap<T> {
+        setValue(fileName: string, value: T): void;
+        getValue(fileName: string): T | never;
+        getValueOrUndefined(fileName: string): T | undefined;
+        hasKey(fileName: string): boolean;
+        removeKey(fileName: string): void;
+        getKeys(): string[];
+    }
+    function createDependencyMapper(): {
+        addReference: (childConfigFileName: ResolvedConfigFileName, parentConfigFileName: ResolvedConfigFileName) => void;
+        getReferencesTo: (parentConfigFileName: ResolvedConfigFileName) => ResolvedConfigFileName[];
+        getReferencesOf: (childConfigFileName: ResolvedConfigFileName) => ResolvedConfigFileName[];
+        getKeys: () => ReadonlyArray<ResolvedConfigFileName>;
+    };
+    function createBuildContext(options: BuildOptions): BuildContext;
+    function performBuild(args: string[], compilerHost: CompilerHost, buildHost: BuildHost, system?: System): void;
+    /**
+     * A SolutionBuilder has an immutable set of rootNames that are the "entry point" projects, but
+     * can dynamically add/remove other projects based on changes on the rootNames' references
+     */
+    function createSolutionBuilder(compilerHost: CompilerHost, buildHost: BuildHost, rootNames: ReadonlyArray<string>, defaultOptions: BuildOptions, system?: System): {
+        buildAllProjects: () => void;
+        getUpToDateStatus: (project: ParsedCommandLine | undefined) => UpToDateStatus;
+        getUpToDateStatusOfFile: (configFileName: ResolvedConfigFileName) => UpToDateStatus;
+        cleanAllProjects: () => void;
+        resetBuildContext: (opts?: BuildOptions) => void;
+        getBuildGraph: (configFileNames: ReadonlyArray<string>) => DependencyGraph | undefined;
+        invalidateProject: (configFileName: string) => void;
+        buildInvalidatedProjects: () => void;
+        buildDependentInvalidatedProjects: () => void;
+        resolveProjectName: (name: string) => ResolvedConfigFileName | undefined;
+        startWatching: () => void;
+    };
+}
+//# sourceMappingURL=compiler.d.ts.map
+declare namespace ts.server {
+    const ActionSet: ActionSet;
+    const ActionInvalidate: ActionInvalidate;
+    const ActionPackageInstalled: ActionPackageInstalled;
+    const EventTypesRegistry: EventTypesRegistry;
+    const EventBeginInstallTypes: EventBeginInstallTypes;
+    const EventEndInstallTypes: EventEndInstallTypes;
+    const EventInitializationFailed: EventInitializationFailed;
+    namespace Arguments {
+        const GlobalCacheLocation = "--globalTypingsCacheLocation";
+        const LogFile = "--logFile";
+        const EnableTelemetry = "--enableTelemetry";
+        const TypingSafeListLocation = "--typingSafeListLocation";
+        const TypesMapLocation = "--typesMapLocation";
+        /**
+         * This argument specifies the location of the NPM executable.
+         * typingsInstaller will run the command with `${npmLocation} install ...`.
+         */
+        const NpmLocation = "--npmLocation";
+    }
+    function hasArgument(argumentName: string): boolean;
+    function findArgument(argumentName: string): string | undefined;
+    function nowString(): string;
+}
+declare namespace ts.server {
+    type ActionSet = "action::set";
+    type ActionInvalidate = "action::invalidate";
+    type ActionPackageInstalled = "action::packageInstalled";
+    type EventTypesRegistry = "event::typesRegistry";
+    type EventBeginInstallTypes = "event::beginInstallTypes";
+    type EventEndInstallTypes = "event::endInstallTypes";
+    type EventInitializationFailed = "event::initializationFailed";
+    interface SortedReadonlyArray<T> extends ReadonlyArray<T> {
+        " __sortedArrayBrand": any;
+    }
+    interface TypingInstallerResponse {
+        readonly kind: ActionSet | ActionInvalidate | EventTypesRegistry | ActionPackageInstalled | EventBeginInstallTypes | EventEndInstallTypes | EventInitializationFailed;
+    }
+    interface TypingInstallerRequestWithProjectName {
+        readonly projectName: string;
+    }
+    type TypingInstallerRequestUnion = DiscoverTypings | CloseProject | TypesRegistryRequest | InstallPackageRequest;
+    interface DiscoverTypings extends TypingInstallerRequestWithProjectName {
+        readonly fileNames: string[];
+        readonly projectRootPath: Path;
+        readonly compilerOptions: CompilerOptions;
+        readonly typeAcquisition: TypeAcquisition;
+        readonly unresolvedImports: SortedReadonlyArray<string>;
+        readonly cachePath?: string;
+        readonly kind: "discover";
+    }
+    interface CloseProject extends TypingInstallerRequestWithProjectName {
+        readonly kind: "closeProject";
+    }
+    interface TypesRegistryRequest {
+        readonly kind: "typesRegistry";
+    }
+    interface InstallPackageRequest extends TypingInstallerRequestWithProjectName {
+        readonly kind: "installPackage";
+        readonly fileName: Path;
+        readonly packageName: string;
+        readonly projectRootPath: Path;
+    }
+    interface TypesRegistryResponse extends TypingInstallerResponse {
+        readonly kind: EventTypesRegistry;
+        readonly typesRegistry: MapLike<MapLike<string>>;
+    }
+    interface PackageInstalledResponse extends ProjectResponse {
+        readonly kind: ActionPackageInstalled;
+        readonly success: boolean;
+        readonly message: string;
+    }
+    interface InitializationFailedResponse extends TypingInstallerResponse {
+        readonly kind: EventInitializationFailed;
+        readonly message: string;
+    }
+    interface ProjectResponse extends TypingInstallerResponse {
+        readonly projectName: string;
+    }
+    interface InvalidateCachedTypings extends ProjectResponse {
+        readonly kind: ActionInvalidate;
+    }
+    interface InstallTypes extends ProjectResponse {
+        readonly kind: EventBeginInstallTypes | EventEndInstallTypes;
+        readonly eventId: number;
+        readonly typingsInstallerVersion: string;
+        readonly packagesToInstall: ReadonlyArray<string>;
+    }
+    interface BeginInstallTypes extends InstallTypes {
+        readonly kind: EventBeginInstallTypes;
+    }
+    interface EndInstallTypes extends InstallTypes {
+        readonly kind: EventEndInstallTypes;
+        readonly installSuccess: boolean;
+    }
+    interface InstallTypingHost extends JsTyping.TypingResolutionHost {
+        useCaseSensitiveFileNames: boolean;
+        writeFile(path: string, content: string): void;
+        createDirectory(path: string): void;
+        watchFile?(path: string, callback: FileWatcherCallback, pollingInterval?: number): FileWatcher;
+        watchDirectory?(path: string, callback: DirectoryWatcherCallback, recursive?: boolean): FileWatcher;
+    }
+    interface SetTypings extends ProjectResponse {
+        readonly typeAcquisition: TypeAcquisition;
+        readonly compilerOptions: CompilerOptions;
+        readonly typings: string[];
+        readonly unresolvedImports: SortedReadonlyArray<string>;
+        readonly kind: ActionSet;
+    }
+    type TypingInstallerResponseUnion = SetTypings | InvalidateCachedTypings | TypesRegistryResponse | PackageInstalledResponse | InstallTypes | InitializationFailedResponse;
+}
+declare namespace ts.JsTyping {
+    interface TypingResolutionHost {
+        directoryExists(path: string): boolean;
+        fileExists(fileName: string): boolean;
+        readFile(path: string, encoding?: string): string | undefined;
+        readDirectory(rootDir: string, extensions: ReadonlyArray<string>, excludes: ReadonlyArray<string> | undefined, includes: ReadonlyArray<string> | undefined, depth?: number): string[];
+    }
+    interface CachedTyping {
+        typingLocation: string;
+        version: Semver;
+    }
+    function isTypingUpToDate(cachedTyping: CachedTyping, availableTypingVersions: MapLike<string>): boolean;
+    const nodeCoreModuleList: ReadonlyArray<string>;
+    const nodeCoreModules: Map<true>;
+    /**
+     * A map of loose file names to library names that we are confident require typings
+     */
+    type SafeList = ReadonlyMap<string>;
+    function loadSafeList(host: TypingResolutionHost, safeListPath: Path): SafeList;
+    function loadTypesMap(host: TypingResolutionHost, typesMapPath: Path): SafeList | undefined;
+    /**
+     * @param host is the object providing I/O related operations.
+     * @param fileNames are the file names that belong to the same project
+     * @param projectRootPath is the path to the project root directory
+     * @param safeListPath is the path used to retrieve the safe list
+     * @param packageNameToTypingLocation is the map of package names to their cached typing locations and installed versions
+     * @param typeAcquisition is used to customize the typing acquisition process
+     * @param compilerOptions are used as a source for typing inference
+     */
+    function discoverTypings(host: TypingResolutionHost, log: ((message: string) => void) | undefined, fileNames: string[], projectRootPath: Path, safeList: SafeList, packageNameToTypingLocation: ReadonlyMap<CachedTyping>, typeAcquisition: TypeAcquisition, unresolvedImports: ReadonlyArray<string>, typesRegistry: ReadonlyMap<MapLike<string>>): {
+        cachedTypingPaths: string[];
+        newTypingNames: string[];
+        filesToWatch: string[];
+    };
+    enum PackageNameValidationResult {
+        Ok = 0,
+        ScopedPackagesNotSupported = 1,
+        EmptyName = 2,
+        NameTooLong = 3,
+        NameStartsWithDot = 4,
+        NameStartsWithUnderscore = 5,
+        NameContainsNonURISafeCharacters = 6
+    }
+    /**
+     * Validates package name using rules defined at https://docs.npmjs.com/files/package.json
+     */
+    function validatePackageName(packageName: string): PackageNameValidationResult;
+    function renderPackageNameValidationFailure(result: PackageNameValidationResult, typing: string): string;
+}
+declare namespace ts {
+    class Semver {
+        readonly major: number;
+        readonly minor: number;
+        readonly patch: number;
+        /**
+         * If true, this is `major.minor.0-next.patch`.
+         * If false, this is `major.minor.patch`.
+         */
+        readonly isPrerelease: boolean;
+        static parse(semver: string): Semver;
+        static fromRaw({ major, minor, patch, isPrerelease }: Semver): Semver;
+        private static tryParse;
+        private constructor();
+        readonly versionString: string;
+        equals(sem: Semver): boolean;
+        greaterThan(sem: Semver): boolean;
+    }
+}
+//# sourceMappingURL=jsTyping.d.ts.map
+declare namespace ts {
+    interface Node {
+        getSourceFile(): SourceFile;
+        getChildCount(sourceFile?: SourceFile): number;
+        getChildAt(index: number, sourceFile?: SourceFile): Node;
+        getChildren(sourceFile?: SourceFile): Node[];
+        getChildren(sourceFile?: SourceFileLike): Node[];
+        getStart(sourceFile?: SourceFile, includeJsDocComment?: boolean): number;
+        getStart(sourceFile?: SourceFileLike, includeJsDocComment?: boolean): number;
+        getFullStart(): number;
+        getEnd(): number;
+        getWidth(sourceFile?: SourceFileLike): number;
+        getFullWidth(): number;
+        getLeadingTriviaWidth(sourceFile?: SourceFile): number;
+        getFullText(sourceFile?: SourceFile): string;
+        getText(sourceFile?: SourceFile): string;
+        getFirstToken(sourceFile?: SourceFile): Node | undefined;
+        getLastToken(sourceFile?: SourceFile): Node | undefined;
+        forEachChild<T>(cbNode: (node: Node) => T | undefined, cbNodeArray?: (nodes: NodeArray<Node>) => T | undefined): T | undefined;
+    }
+    interface Identifier {
+        readonly text: string;
+    }
+    interface Symbol {
+        readonly name: string;
+        getFlags(): SymbolFlags;
+        getEscapedName(): __String;
+        getName(): string;
+        getDeclarations(): Declaration[] | undefined;
+        getDocumentationComment(typeChecker: TypeChecker | undefined): SymbolDisplayPart[];
+        getJsDocTags(): JSDocTagInfo[];
+    }
+    interface Type {
+        getFlags(): TypeFlags;
+        getSymbol(): Symbol | undefined;
+        getProperties(): Symbol[];
+        getProperty(propertyName: string): Symbol | undefined;
+        getApparentProperties(): Symbol[];
+        getCallSignatures(): Signature[];
+        getConstructSignatures(): Signature[];
+        getStringIndexType(): Type | undefined;
+        getNumberIndexType(): Type | undefined;
+        getBaseTypes(): BaseType[] | undefined;
+        getNonNullableType(): Type;
+        getConstraint(): Type | undefined;
+        getDefault(): Type | undefined;
+        isUnion(): this is UnionType;
+        isIntersection(): this is IntersectionType;
+        isUnionOrIntersection(): this is UnionOrIntersectionType;
+        isLiteral(): this is LiteralType;
+        isStringLiteral(): this is StringLiteralType;
+        isNumberLiteral(): this is NumberLiteralType;
+        isTypeParameter(): this is TypeParameter;
+        isClassOrInterface(): this is InterfaceType;
+        isClass(): this is InterfaceType;
+    }
+    interface Signature {
+        getDeclaration(): SignatureDeclaration;
+        getTypeParameters(): TypeParameter[] | undefined;
+        getParameters(): Symbol[];
+        getReturnType(): Type;
+        getDocumentationComment(typeChecker: TypeChecker | undefined): SymbolDisplayPart[];
+        getJsDocTags(): JSDocTagInfo[];
+    }
+    interface SourceFile {
+        version: string;
+        scriptSnapshot: IScriptSnapshot | undefined;
+        nameTable: UnderscoreEscapedMap<number> | undefined;
+        getNamedDeclarations(): Map<Declaration[]>;
+        getLineAndCharacterOfPosition(pos: number): LineAndCharacter;
+        getLineEndOfPosition(pos: number): number;
+        getLineStarts(): ReadonlyArray<number>;
+        getPositionOfLineAndCharacter(line: number, character: number): number;
+        update(newText: string, textChangeRange: TextChangeRange): SourceFile;
+        sourceMapper?: sourcemaps.SourceMapper;
+    }
+    interface SourceFileLike {
+        getLineAndCharacterOfPosition(pos: number): LineAndCharacter;
+        sourceMapper?: sourcemaps.SourceMapper;
+    }
+    interface SourceMapSource {
+        getLineAndCharacterOfPosition(pos: number): LineAndCharacter;
+    }
+    /**
+     * Represents an immutable snapshot of a script at a specified time.Once acquired, the
+     * snapshot is observably immutable. i.e. the same calls with the same parameters will return
+     * the same values.
+     */
+    interface IScriptSnapshot {
+        /** Gets a portion of the script snapshot specified by [start, end). */
+        getText(start: number, end: number): string;
+        /** Gets the length of this script snapshot. */
+        getLength(): number;
+        /**
+         * Gets the TextChangeRange that describe how the text changed between this text and
+         * an older version.  This information is used by the incremental parser to determine
+         * what sections of the script need to be re-parsed.  'undefined' can be returned if the
+         * change range cannot be determined.  However, in that case, incremental parsing will
+         * not happen and the entire document will be re - parsed.
+         */
+        getChangeRange(oldSnapshot: IScriptSnapshot): TextChangeRange | undefined;
+        /** Releases all resources held by this script snapshot */
+        dispose?(): void;
+    }
+    namespace ScriptSnapshot {
+        function fromString(text: string): IScriptSnapshot;
+    }
+    interface PreProcessedFileInfo {
+        referencedFiles: FileReference[];
+        typeReferenceDirectives: FileReference[];
+        libReferenceDirectives: FileReference[];
+        importedFiles: FileReference[];
+        ambientExternalModules?: string[];
+        isLibFile: boolean;
+    }
+    interface HostCancellationToken {
+        isCancellationRequested(): boolean;
+    }
+    interface InstallPackageOptions {
+        fileName: Path;
+        packageName: string;
+    }
+    interface LanguageServiceHost extends GetEffectiveTypeRootsHost {
+        getCompilationSettings(): CompilerOptions;
+        getNewLine?(): string;
+        getProjectVersion?(): string;
+        getScriptFileNames(): string[];
+        getScriptKind?(fileName: string): ScriptKind;
+        getScriptVersion(fileName: string): string;
+        getScriptSnapshot(fileName: string): IScriptSnapshot | undefined;
+        getProjectReferences?(): ReadonlyArray<ProjectReference> | undefined;
+        getLocalizedDiagnosticMessages?(): any;
+        getCancellationToken?(): HostCancellationToken;
+        getCurrentDirectory(): string;
+        getDefaultLibFileName(options: CompilerOptions): string;
+        log?(s: string): void;
+        trace?(s: string): void;
+        error?(s: string): void;
+        useCaseSensitiveFileNames?(): boolean;
+        readDirectory?(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
+        readFile?(path: string, encoding?: string): string | undefined;
+        realpath?(path: string): string;
+        fileExists?(path: string): boolean;
+        getTypeRootsVersion?(): number;
+        resolveModuleNames?(moduleNames: string[], containingFile: string, reusedNames?: string[]): ResolvedModule[];
+        getResolvedModuleWithFailedLookupLocationsFromCache?(modulename: string, containingFile: string): ResolvedModuleWithFailedLookupLocations | undefined;
+        resolveTypeReferenceDirectives?(typeDirectiveNames: string[], containingFile: string): ResolvedTypeReferenceDirective[];
+        hasInvalidatedResolution?: HasInvalidatedResolution;
+        hasChangedAutomaticTypeDirectiveNames?: boolean;
+        getDirectories?(directoryName: string): string[];
+        /**
+         * Gets a set of custom transformers to use during emit.
+         */
+        getCustomTransformers?(): CustomTransformers | undefined;
+        isKnownTypesPackageName?(name: string): boolean;
+        installPackage?(options: InstallPackageOptions): Promise<ApplyCodeActionCommandResult>;
+    }
+    interface UserPreferences {
+        readonly disableSuggestions?: boolean;
+        readonly quotePreference?: "double" | "single";
+        readonly includeCompletionsForModuleExports?: boolean;
+        readonly includeCompletionsWithInsertText?: boolean;
+        readonly importModuleSpecifierPreference?: "relative" | "non-relative";
+        readonly allowTextChangesInNewFiles?: boolean;
+    }
+    const defaultPreferences: UserPreferences;
+    interface LanguageService {
+        cleanupSemanticCache(): void;
+        getSyntacticDiagnostics(fileName: string): DiagnosticWithLocation[];
+        /** The first time this is called, it will return global diagnostics (no location). */
+        getSemanticDiagnostics(fileName: string): Diagnostic[];
+        getSuggestionDiagnostics(fileName: string): DiagnosticWithLocation[];
+        getCompilerOptionsDiagnostics(): Diagnostic[];
+        /**
+         * @deprecated Use getEncodedSyntacticClassifications instead.
+         */
+        getSyntacticClassifications(fileName: string, span: TextSpan): ClassifiedSpan[];
+        /**
+         * @deprecated Use getEncodedSemanticClassifications instead.
+         */
+        getSemanticClassifications(fileName: string, span: TextSpan): ClassifiedSpan[];
+        getEncodedSyntacticClassifications(fileName: string, span: TextSpan): Classifications;
+        getEncodedSemanticClassifications(fileName: string, span: TextSpan): Classifications;
+        getCompletionsAtPosition(fileName: string, position: number, options: GetCompletionsAtPositionOptions | undefined): CompletionInfo | undefined;
+        getCompletionEntryDetails(fileName: string, position: number, name: string, formatOptions: FormatCodeOptions | FormatCodeSettings | undefined, source: string | undefined, preferences: UserPreferences | undefined): CompletionEntryDetails | undefined;
+        getCompletionEntrySymbol(fileName: string, position: number, name: string, source: string | undefined): Symbol | undefined;
+        getQuickInfoAtPosition(fileName: string, position: number): QuickInfo | undefined;
+        getNameOrDottedNameSpan(fileName: string, startPos: number, endPos: number): TextSpan | undefined;
+        getBreakpointStatementAtPosition(fileName: string, position: number): TextSpan | undefined;
+        getSignatureHelpItems(fileName: string, position: number): SignatureHelpItems | undefined;
+        getRenameInfo(fileName: string, position: number): RenameInfo;
+        findRenameLocations(fileName: string, position: number, findInStrings: boolean, findInComments: boolean): RenameLocation[] | undefined;
+        getDefinitionAtPosition(fileName: string, position: number): DefinitionInfo[] | undefined;
+        getDefinitionAndBoundSpan(fileName: string, position: number): DefinitionInfoAndBoundSpan | undefined;
+        getTypeDefinitionAtPosition(fileName: string, position: number): DefinitionInfo[] | undefined;
+        getImplementationAtPosition(fileName: string, position: number): ImplementationLocation[] | undefined;
+        getReferencesAtPosition(fileName: string, position: number): ReferenceEntry[] | undefined;
+        findReferences(fileName: string, position: number): ReferencedSymbol[] | undefined;
+        getDocumentHighlights(fileName: string, position: number, filesToSearch: string[]): DocumentHighlights[] | undefined;
+        /** @deprecated */
+        getOccurrencesAtPosition(fileName: string, position: number): ReferenceEntry[] | undefined;
+        getNavigateToItems(searchValue: string, maxResultCount?: number, fileName?: string, excludeDtsFiles?: boolean): NavigateToItem[];
+        getNavigationBarItems(fileName: string): NavigationBarItem[];
+        getNavigationTree(fileName: string): NavigationTree;
+        getOutliningSpans(fileName: string): OutliningSpan[];
+        getTodoComments(fileName: string, descriptors: TodoCommentDescriptor[]): TodoComment[];
+        getBraceMatchingAtPosition(fileName: string, position: number): TextSpan[];
+        getIndentationAtPosition(fileName: string, position: number, options: EditorOptions | EditorSettings): number;
+        getFormattingEditsForRange(fileName: string, start: number, end: number, options: FormatCodeOptions | FormatCodeSettings): TextChange[];
+        getFormattingEditsForDocument(fileName: string, options: FormatCodeOptions | FormatCodeSettings): TextChange[];
+        getFormattingEditsAfterKeystroke(fileName: string, position: number, key: string, options: FormatCodeOptions | FormatCodeSettings): TextChange[];
+        getDocCommentTemplateAtPosition(fileName: string, position: number): TextInsertion | undefined;
+        isValidBraceCompletionAtPosition(fileName: string, position: number, openingBrace: number): boolean;
+        /**
+         * This will return a defined result if the position is after the `>` of the opening tag, or somewhere in the text, of a JSXElement with no closing tag.
+         * Editors should call this after `>` is typed.
+         */
+        getJsxClosingTagAtPosition(fileName: string, position: number): JsxClosingTagInfo | undefined;
+        getSpanOfEnclosingComment(fileName: string, position: number, onlyMultiLine: boolean): TextSpan | undefined;
+        toLineColumnOffset?(fileName: string, position: number): LineAndCharacter;
+        getCodeFixesAtPosition(fileName: string, start: number, end: number, errorCodes: ReadonlyArray<number>, formatOptions: FormatCodeSettings, preferences: UserPreferences): ReadonlyArray<CodeFixAction>;
+        getCombinedCodeFix(scope: CombinedCodeFixScope, fixId: {}, formatOptions: FormatCodeSettings, preferences: UserPreferences): CombinedCodeActions;
+        applyCodeActionCommand(action: CodeActionCommand): Promise<ApplyCodeActionCommandResult>;
+        applyCodeActionCommand(action: CodeActionCommand[]): Promise<ApplyCodeActionCommandResult[]>;
+        applyCodeActionCommand(action: CodeActionCommand | CodeActionCommand[]): Promise<ApplyCodeActionCommandResult | ApplyCodeActionCommandResult[]>;
+        /** @deprecated `fileName` will be ignored */
+        applyCodeActionCommand(fileName: string, action: CodeActionCommand): Promise<ApplyCodeActionCommandResult>;
+        /** @deprecated `fileName` will be ignored */
+        applyCodeActionCommand(fileName: string, action: CodeActionCommand[]): Promise<ApplyCodeActionCommandResult[]>;
+        /** @deprecated `fileName` will be ignored */
+        applyCodeActionCommand(fileName: string, action: CodeActionCommand | CodeActionCommand[]): Promise<ApplyCodeActionCommandResult | ApplyCodeActionCommandResult[]>;
+        getApplicableRefactors(fileName: string, positionOrRange: number | TextRange, preferences: UserPreferences | undefined): ApplicableRefactorInfo[];
+        getEditsForRefactor(fileName: string, formatOptions: FormatCodeSettings, positionOrRange: number | TextRange, refactorName: string, actionName: string, preferences: UserPreferences | undefined): RefactorEditInfo | undefined;
+        organizeImports(scope: OrganizeImportsScope, formatOptions: FormatCodeSettings, preferences: UserPreferences | undefined): ReadonlyArray<FileTextChanges>;
+        getEditsForFileRename(oldFilePath: string, newFilePath: string, formatOptions: FormatCodeSettings, preferences: UserPreferences | undefined): ReadonlyArray<FileTextChanges>;
+        getEmitOutput(fileName: string, emitOnlyDtsFiles?: boolean): EmitOutput;
+        getProgram(): Program | undefined;
+        getNonBoundSourceFile(fileName: string): SourceFile;
+        dispose(): void;
+    }
+    interface JsxClosingTagInfo {
+        readonly newText: string;
+    }
+    interface CombinedCodeFixScope {
+        type: "file";
+        fileName: string;
+    }
+    type OrganizeImportsScope = CombinedCodeFixScope;
+    type CompletionsTriggerCharacter = "." | '"' | "'" | "`" | "/" | "@" | "<";
+    interface GetCompletionsAtPositionOptions extends UserPreferences {
+        /** If the editor is asking for completions because a certain character was typed, and not because the user explicitly requested them, this should be set. */
+        triggerCharacter?: CompletionsTriggerCharacter;
+        /** @deprecated Use includeCompletionsForModuleExports */
+        includeExternalModuleExports?: boolean;
+        /** @deprecated Use includeCompletionsWithInsertText */
+        includeInsertTextCompletions?: boolean;
+    }
+    interface ApplyCodeActionCommandResult {
+        successMessage: string;
+    }
+    interface Classifications {
+        spans: number[];
+        endOfLineState: EndOfLineState;
+    }
+    interface ClassifiedSpan {
+        textSpan: TextSpan;
+        classificationType: ClassificationTypeNames;
+    }
+    /**
+     * Navigation bar interface designed for visual studio's dual-column layout.
+     * This does not form a proper tree.
+     * The navbar is returned as a list of top-level items, each of which has a list of child items.
+     * Child items always have an empty array for their `childItems`.
+     */
+    interface NavigationBarItem {
+        text: string;
+        kind: ScriptElementKind;
+        kindModifiers: string;
+        spans: TextSpan[];
+        childItems: NavigationBarItem[];
+        indent: number;
+        bolded: boolean;
+        grayed: boolean;
+    }
+    /**
+     * Node in a tree of nested declarations in a file.
+     * The top node is always a script or module node.
+     */
+    interface NavigationTree {
+        /** Name of the declaration, or a short description, e.g. "<class>". */
+        text: string;
+        kind: ScriptElementKind;
+        /** ScriptElementKindModifier separated by commas, e.g. "public,abstract" */
+        kindModifiers: string;
+        /**
+         * Spans of the nodes that generated this declaration.
+         * There will be more than one if this is the result of merging.
+         */
+        spans: TextSpan[];
+        nameSpan: TextSpan | undefined;
+        /** Present if non-empty */
+        childItems?: NavigationTree[];
+    }
+    interface TodoCommentDescriptor {
+        text: string;
+        priority: number;
+    }
+    interface TodoComment {
+        descriptor: TodoCommentDescriptor;
+        message: string;
+        position: number;
+    }
+    class TextChange {
+        span: TextSpan;
+        newText: string;
+    }
+    interface FileTextChanges {
+        fileName: string;
+        textChanges: TextChange[];
+        isNewFile?: boolean;
+    }
+    interface CodeAction {
+        /** Description of the code action to display in the UI of the editor */
+        description: string;
+        /** Text changes to apply to each file as part of the code action */
+        changes: FileTextChanges[];
+        /**
+         * If the user accepts the code fix, the editor should send the action back in a `applyAction` request.
+         * This allows the language service to have side effects (e.g. installing dependencies) upon a code fix.
+         */
+        commands?: CodeActionCommand[];
+    }
+    interface CodeFixAction extends CodeAction {
+        /** Short name to identify the fix, for use by telemetry. */
+        fixName: string;
+        /**
+         * If present, one may call 'getCombinedCodeFix' with this fixId.
+         * This may be omitted to indicate that the code fix can't be applied in a group.
+         */
+        fixId?: {};
+        fixAllDescription?: string;
+    }
+    interface CombinedCodeActions {
+        changes: ReadonlyArray<FileTextChanges>;
+        commands?: ReadonlyArray<CodeActionCommand>;
+    }
+    type CodeActionCommand = InstallPackageAction;
+    interface InstallPackageAction {
+        file: string;
+        type: "install package";
+        packageName: string;
+    }
+    /**
+     * A set of one or more available refactoring actions, grouped under a parent refactoring.
+     */
+    interface ApplicableRefactorInfo {
+        /**
+         * The programmatic name of the refactoring
+         */
+        name: string;
+        /**
+         * A description of this refactoring category to show to the user.
+         * If the refactoring gets inlined (see below), this text will not be visible.
+         */
+        description: string;
+        /**
+         * Inlineable refactorings can have their actions hoisted out to the top level
+         * of a context menu. Non-inlineanable refactorings should always be shown inside
+         * their parent grouping.
+         *
+         * If not specified, this value is assumed to be 'true'
+         */
+        inlineable?: boolean;
+        actions: RefactorActionInfo[];
+    }
+    /**
+     * Represents a single refactoring action - for example, the "Extract Method..." refactor might
+     * offer several actions, each corresponding to a surround class or closure to extract into.
+     */
+    interface RefactorActionInfo {
+        /**
+         * The programmatic name of the refactoring action
+         */
+        name: string;
+        /**
+         * A description of this refactoring action to show to the user.
+         * If the parent refactoring is inlined away, this will be the only text shown,
+         * so this description should make sense by itself if the parent is inlineable=true
+         */
+        description: string;
+    }
+    /**
+     * A set of edits to make in response to a refactor action, plus an optional
+     * location where renaming should be invoked from
+     */
+    interface RefactorEditInfo {
+        edits: FileTextChanges[];
+        renameFilename?: string;
+        renameLocation?: number;
+        commands?: CodeActionCommand[];
+    }
+    interface TextInsertion {
+        newText: string;
+        /** The position in newText the caret should point to after the insertion. */
+        caretOffset: number;
+    }
+    interface DocumentSpan {
+        textSpan: TextSpan;
+        fileName: string;
+        /**
+         * If the span represents a location that was remapped (e.g. via a .d.ts.map file),
+         * then the original filename and span will be specified here
+         */
+        originalTextSpan?: TextSpan;
+        originalFileName?: string;
+    }
+    interface RenameLocation extends DocumentSpan {
+    }
+    interface ReferenceEntry extends DocumentSpan {
+        isWriteAccess: boolean;
+        isDefinition: boolean;
+        isInString?: true;
+    }
+    interface ImplementationLocation extends DocumentSpan {
+        kind: ScriptElementKind;
+        displayParts: SymbolDisplayPart[];
+    }
+    interface DocumentHighlights {
+        fileName: string;
+        highlightSpans: HighlightSpan[];
+    }
+    enum HighlightSpanKind {
+        none = "none",
+        definition = "definition",
+        reference = "reference",
+        writtenReference = "writtenReference"
+    }
+    interface HighlightSpan {
+        fileName?: string;
+        isInString?: true;
+        textSpan: TextSpan;
+        kind: HighlightSpanKind;
+    }
+    interface NavigateToItem {
+        name: string;
+        kind: ScriptElementKind;
+        kindModifiers: string;
+        matchKind: string;
+        isCaseSensitive: boolean;
+        fileName: string;
+        textSpan: TextSpan;
+        containerName: string;
+        containerKind: ScriptElementKind;
+    }
+    enum IndentStyle {
+        None = 0,
+        Block = 1,
+        Smart = 2
+    }
+    interface EditorOptions {
+        BaseIndentSize?: number;
+        IndentSize: number;
+        TabSize: number;
+        NewLineCharacter: string;
+        ConvertTabsToSpaces: boolean;
+        IndentStyle: IndentStyle;
+    }
+    interface EditorSettings {
+        baseIndentSize?: number;
+        indentSize?: number;
+        tabSize?: number;
+        newLineCharacter?: string;
+        convertTabsToSpaces?: boolean;
+        indentStyle?: IndentStyle;
+    }
+    interface FormatCodeOptions extends EditorOptions {
+        InsertSpaceAfterCommaDelimiter: boolean;
+        InsertSpaceAfterSemicolonInForStatements: boolean;
+        InsertSpaceBeforeAndAfterBinaryOperators: boolean;
+        InsertSpaceAfterConstructor?: boolean;
+        InsertSpaceAfterKeywordsInControlFlowStatements: boolean;
+        InsertSpaceAfterFunctionKeywordForAnonymousFunctions: boolean;
+        InsertSpaceAfterOpeningAndBeforeClosingNonemptyParenthesis: boolean;
+        InsertSpaceAfterOpeningAndBeforeClosingNonemptyBrackets: boolean;
+        InsertSpaceAfterOpeningAndBeforeClosingNonemptyBraces?: boolean;
+        InsertSpaceAfterOpeningAndBeforeClosingTemplateStringBraces: boolean;
+        InsertSpaceAfterOpeningAndBeforeClosingJsxExpressionBraces?: boolean;
+        InsertSpaceAfterTypeAssertion?: boolean;
+        InsertSpaceBeforeFunctionParenthesis?: boolean;
+        PlaceOpenBraceOnNewLineForFunctions: boolean;
+        PlaceOpenBraceOnNewLineForControlBlocks: boolean;
+        insertSpaceBeforeTypeAnnotation?: boolean;
+    }
+    interface FormatCodeSettings extends EditorSettings {
+        insertSpaceAfterCommaDelimiter?: boolean;
+        insertSpaceAfterSemicolonInForStatements?: boolean;
+        insertSpaceBeforeAndAfterBinaryOperators?: boolean;
+        insertSpaceAfterConstructor?: boolean;
+        insertSpaceAfterKeywordsInControlFlowStatements?: boolean;
+        insertSpaceAfterFunctionKeywordForAnonymousFunctions?: boolean;
+        insertSpaceAfterOpeningAndBeforeClosingNonemptyParenthesis?: boolean;
+        insertSpaceAfterOpeningAndBeforeClosingNonemptyBrackets?: boolean;
+        insertSpaceAfterOpeningAndBeforeClosingNonemptyBraces?: boolean;
+        insertSpaceAfterOpeningAndBeforeClosingTemplateStringBraces?: boolean;
+        insertSpaceAfterOpeningAndBeforeClosingJsxExpressionBraces?: boolean;
+        insertSpaceAfterTypeAssertion?: boolean;
+        insertSpaceBeforeFunctionParenthesis?: boolean;
+        placeOpenBraceOnNewLineForFunctions?: boolean;
+        placeOpenBraceOnNewLineForControlBlocks?: boolean;
+        insertSpaceBeforeTypeAnnotation?: boolean;
+        indentMultiLineObjectLiteralBeginningOnBlankLine?: boolean;
+    }
+    interface DefinitionInfo extends DocumentSpan {
+        kind: ScriptElementKind;
+        name: string;
+        containerKind: ScriptElementKind;
+        containerName: string;
+    }
+    interface DefinitionInfoAndBoundSpan {
+        definitions?: ReadonlyArray<DefinitionInfo>;
+        textSpan: TextSpan;
+    }
+    interface ReferencedSymbolDefinitionInfo extends DefinitionInfo {
+        displayParts: SymbolDisplayPart[];
+    }
+    interface ReferencedSymbol {
+        definition: ReferencedSymbolDefinitionInfo;
+        references: ReferenceEntry[];
+    }
+    enum SymbolDisplayPartKind {
+        aliasName = 0,
+        className = 1,
+        enumName = 2,
+        fieldName = 3,
+        interfaceName = 4,
+        keyword = 5,
+        lineBreak = 6,
+        numericLiteral = 7,
+        stringLiteral = 8,
+        localName = 9,
+        methodName = 10,
+        moduleName = 11,
+        operator = 12,
+        parameterName = 13,
+        propertyName = 14,
+        punctuation = 15,
+        space = 16,
+        text = 17,
+        typeParameterName = 18,
+        enumMemberName = 19,
+        functionName = 20,
+        regularExpressionLiteral = 21
+    }
+    interface SymbolDisplayPart {
+        text: string;
+        kind: string;
+    }
+    interface JSDocTagInfo {
+        name: string;
+        text?: string;
+    }
+    interface QuickInfo {
+        kind: ScriptElementKind;
+        kindModifiers: string;
+        textSpan: TextSpan;
+        displayParts?: SymbolDisplayPart[];
+        documentation?: SymbolDisplayPart[];
+        tags?: JSDocTagInfo[];
+    }
+    interface RenameInfo {
+        canRename: boolean;
+        localizedErrorMessage?: string;
+        displayName: string;
+        fullDisplayName: string;
+        kind: ScriptElementKind;
+        kindModifiers: string;
+        triggerSpan: TextSpan;
+    }
+    interface SignatureHelpParameter {
+        name: string;
+        documentation: SymbolDisplayPart[];
+        displayParts: SymbolDisplayPart[];
+        isOptional: boolean;
+    }
+    /**
+     * Represents a single signature to show in signature help.
+     * The id is used for subsequent calls into the language service to ask questions about the
+     * signature help item in the context of any documents that have been updated.  i.e. after
+     * an edit has happened, while signature help is still active, the host can ask important
+     * questions like 'what parameter is the user currently contained within?'.
+     */
+    interface SignatureHelpItem {
+        isVariadic: boolean;
+        prefixDisplayParts: SymbolDisplayPart[];
+        suffixDisplayParts: SymbolDisplayPart[];
+        separatorDisplayParts: SymbolDisplayPart[];
+        parameters: SignatureHelpParameter[];
+        documentation: SymbolDisplayPart[];
+        tags: JSDocTagInfo[];
+    }
+    /**
+     * Represents a set of signature help items, and the preferred item that should be selected.
+     */
+    interface SignatureHelpItems {
+        items: SignatureHelpItem[];
+        applicableSpan: TextSpan;
+        selectedItemIndex: number;
+        argumentIndex: number;
+        argumentCount: number;
+    }
+    interface CompletionInfo {
+        /** Not true for all glboal completions. This will be true if the enclosing scope matches a few syntax kinds. See `isSnippetScope`. */
+        isGlobalCompletion: boolean;
+        isMemberCompletion: boolean;
+        /**
+         * true when the current location also allows for a new identifier
+         */
+        isNewIdentifierLocation: boolean;
+        entries: CompletionEntry[];
+    }
+    interface CompletionEntry {
+        name: string;
+        kind: ScriptElementKind;
+        kindModifiers?: string;
+        sortText: string;
+        insertText?: string;
+        /**
+         * An optional span that indicates the text to be replaced by this completion item.
+         * If present, this span should be used instead of the default one.
+         * It will be set if the required span differs from the one generated by the default replacement behavior.
+         */
+        replacementSpan?: TextSpan;
+        hasAction?: true;
+        source?: string;
+        isRecommended?: true;
+    }
+    interface CompletionEntryDetails {
+        name: string;
+        kind: ScriptElementKind;
+        kindModifiers: string;
+        displayParts: SymbolDisplayPart[];
+        documentation?: SymbolDisplayPart[];
+        tags?: JSDocTagInfo[];
+        codeActions?: CodeAction[];
+        source?: SymbolDisplayPart[];
+    }
+    interface OutliningSpan {
+        /** The span of the document to actually collapse. */
+        textSpan: TextSpan;
+        /** The span of the document to display when the user hovers over the collapsed span. */
+        hintSpan: TextSpan;
+        /** The text to display in the editor for the collapsed region. */
+        bannerText: string;
+        /**
+         * Whether or not this region should be automatically collapsed when
+         * the 'Collapse to Definitions' command is invoked.
+         */
+        autoCollapse: boolean;
+        /**
+         * Classification of the contents of the span
+         */
+        kind: OutliningSpanKind;
+    }
+    enum OutliningSpanKind {
+        /** Single or multi-line comments */
+        Comment = "comment",
+        /** Sections marked by '// #region' and '// #endregion' comments */
+        Region = "region",
+        /** Declarations and expressions */
+        Code = "code",
+        /** Contiguous blocks of import declarations */
+        Imports = "imports"
+    }
+    enum OutputFileType {
+        JavaScript = 0,
+        SourceMap = 1,
+        Declaration = 2
+    }
+    enum EndOfLineState {
+        None = 0,
+        InMultiLineCommentTrivia = 1,
+        InSingleQuoteStringLiteral = 2,
+        InDoubleQuoteStringLiteral = 3,
+        InTemplateHeadOrNoSubstitutionTemplate = 4,
+        InTemplateMiddleOrTail = 5,
+        InTemplateSubstitutionPosition = 6
+    }
+    enum TokenClass {
+        Punctuation = 0,
+        Keyword = 1,
+        Operator = 2,
+        Comment = 3,
+        Whitespace = 4,
+        Identifier = 5,
+        NumberLiteral = 6,
+        StringLiteral = 7,
+        RegExpLiteral = 8
+    }
+    interface ClassificationResult {
+        finalLexState: EndOfLineState;
+        entries: ClassificationInfo[];
+    }
+    interface ClassificationInfo {
+        length: number;
+        classification: TokenClass;
+    }
+    interface Classifier {
+        /**
+         * Gives lexical classifications of tokens on a line without any syntactic context.
+         * For instance, a token consisting of the text 'string' can be either an identifier
+         * named 'string' or the keyword 'string', however, because this classifier is not aware,
+         * it relies on certain heuristics to give acceptable results. For classifications where
+         * speed trumps accuracy, this function is preferable; however, for true accuracy, the
+         * syntactic classifier is ideal. In fact, in certain editing scenarios, combining the
+         * lexical, syntactic, and semantic classifiers may issue the best user experience.
+         *
+         * @param text                      The text of a line to classify.
+         * @param lexState                  The state of the lexical classifier at the end of the previous line.
+         * @param syntacticClassifierAbsent Whether the client is *not* using a syntactic classifier.
+         *                                  If there is no syntactic classifier (syntacticClassifierAbsent=true),
+         *                                  certain heuristics may be used in its place; however, if there is a
+         *                                  syntactic classifier (syntacticClassifierAbsent=false), certain
+         *                                  classifications which may be incorrectly categorized will be given
+         *                                  back as Identifiers in order to allow the syntactic classifier to
+         *                                  subsume the classification.
+         * @deprecated Use getLexicalClassifications instead.
+         */
+        getClassificationsForLine(text: string, lexState: EndOfLineState, syntacticClassifierAbsent: boolean): ClassificationResult;
+        getEncodedLexicalClassifications(text: string, endOfLineState: EndOfLineState, syntacticClassifierAbsent: boolean): Classifications;
+    }
+    enum ScriptElementKind {
+        unknown = "",
+        warning = "warning",
+        /** predefined type (void) or keyword (class) */
+        keyword = "keyword",
+        /** top level script node */
+        scriptElement = "script",
+        /** module foo {} */
+        moduleElement = "module",
+        /** class X {} */
+        classElement = "class",
+        /** var x = class X {} */
+        localClassElement = "local class",
+        /** interface Y {} */
+        interfaceElement = "interface",
+        /** type T = ... */
+        typeElement = "type",
+        /** enum E */
+        enumElement = "enum",
+        enumMemberElement = "enum member",
+        /**
+         * Inside module and script only
+         * const v = ..
+         */
+        variableElement = "var",
+        /** Inside function */
+        localVariableElement = "local var",
+        /**
+         * Inside module and script only
+         * function f() { }
+         */
+        functionElement = "function",
+        /** Inside function */
+        localFunctionElement = "local function",
+        /** class X { [public|private]* foo() {} } */
+        memberFunctionElement = "method",
+        /** class X { [public|private]* [get|set] foo:number; } */
+        memberGetAccessorElement = "getter",
+        memberSetAccessorElement = "setter",
+        /**
+         * class X { [public|private]* foo:number; }
+         * interface Y { foo:number; }
+         */
+        memberVariableElement = "property",
+        /** class X { constructor() { } } */
+        constructorImplementationElement = "constructor",
+        /** interface Y { ():number; } */
+        callSignatureElement = "call",
+        /** interface Y { []:number; } */
+        indexSignatureElement = "index",
+        /** interface Y { new():Y; } */
+        constructSignatureElement = "construct",
+        /** function foo(*Y*: string) */
+        parameterElement = "parameter",
+        typeParameterElement = "type parameter",
+        primitiveType = "primitive type",
+        label = "label",
+        alias = "alias",
+        constElement = "const",
+        letElement = "let",
+        directory = "directory",
+        externalModuleName = "external module name",
+        /**
+         * <JsxTagName attribute1 attribute2={0} />
+         */
+        jsxAttribute = "JSX attribute",
+        /** String literal */
+        string = "string"
+    }
+    enum ScriptElementKindModifier {
+        none = "",
+        publicMemberModifier = "public",
+        privateMemberModifier = "private",
+        protectedMemberModifier = "protected",
+        exportedModifier = "export",
+        ambientModifier = "declare",
+        staticModifier = "static",
+        abstractModifier = "abstract",
+        optionalModifier = "optional"
+    }
+    enum ClassificationTypeNames {
+        comment = "comment",
+        identifier = "identifier",
+        keyword = "keyword",
+        numericLiteral = "number",
+        operator = "operator",
+        stringLiteral = "string",
+        whiteSpace = "whitespace",
+        text = "text",
+        punctuation = "punctuation",
+        className = "class name",
+        enumName = "enum name",
+        interfaceName = "interface name",
+        moduleName = "module name",
+        typeParameterName = "type parameter name",
+        typeAliasName = "type alias name",
+        parameterName = "parameter name",
+        docCommentTagName = "doc comment tag name",
+        jsxOpenTagName = "jsx open tag name",
+        jsxCloseTagName = "jsx close tag name",
+        jsxSelfClosingTagName = "jsx self closing tag name",
+        jsxAttribute = "jsx attribute",
+        jsxText = "jsx text",
+        jsxAttributeStringLiteralValue = "jsx attribute string literal value"
+    }
+    enum ClassificationType {
+        comment = 1,
+        identifier = 2,
+        keyword = 3,
+        numericLiteral = 4,
+        operator = 5,
+        stringLiteral = 6,
+        regularExpressionLiteral = 7,
+        whiteSpace = 8,
+        text = 9,
+        punctuation = 10,
+        className = 11,
+        enumName = 12,
+        interfaceName = 13,
+        moduleName = 14,
+        typeParameterName = 15,
+        typeAliasName = 16,
+        parameterName = 17,
+        docCommentTagName = 18,
+        jsxOpenTagName = 19,
+        jsxCloseTagName = 20,
+        jsxSelfClosingTagName = 21,
+        jsxAttribute = 22,
+        jsxText = 23,
+        jsxAttributeStringLiteralValue = 24
+    }
+}
+interface PromiseConstructor {
+    new <T>(executor: (resolve: (value?: T | PromiseLike<T>) => void, reject: (reason?: any) => void) => void): Promise<T>;
+    reject(reason: any): Promise<never>;
+    all<T>(values: (T | PromiseLike<T>)[]): Promise<T[]>;
+}
+declare var Promise: PromiseConstructor;
+declare namespace ts {
+    const scanner: Scanner;
+    enum SemanticMeaning {
+        None = 0,
+        Value = 1,
+        Type = 2,
+        Namespace = 4,
+        All = 7
+    }
+    function getMeaningFromDeclaration(node: Node): SemanticMeaning;
+    function getMeaningFromLocation(node: Node): SemanticMeaning;
+    function isInRightSideOfInternalImportEqualsDeclaration(node: Node): boolean;
+    function isCallExpressionTarget(node: Node): boolean;
+    function isNewExpressionTarget(node: Node): boolean;
+    function climbPastPropertyAccess(node: Node): Node;
+    function getTargetLabel(referenceNode: Node, labelName: string): Identifier | undefined;
+    function isJumpStatementTarget(node: Node): node is Identifier & {
+        parent: BreakOrContinueStatement;
+    };
+    function isLabelOfLabeledStatement(node: Node): node is Identifier;
+    function isLabelName(node: Node): boolean;
+    function isRightSideOfQualifiedName(node: Node): boolean;
+    function isRightSideOfPropertyAccess(node: Node): boolean;
+    function isNameOfModuleDeclaration(node: Node): boolean;
+    function isNameOfFunctionDeclaration(node: Node): boolean;
+    function isLiteralNameOfPropertyDeclarationOrIndexAccess(node: StringLiteral | NumericLiteral): boolean;
+    function isExpressionOfExternalModuleImportEqualsDeclaration(node: Node): boolean;
+    function getContainerNode(node: Node): Declaration | undefined;
+    function getNodeKind(node: Node): ScriptElementKind;
+    function isThis(node: Node): boolean;
+    interface ListItemInfo {
+        listItemIndex: number;
+        list: Node;
+    }
+    function getLineStartPositionForPosition(position: number, sourceFile: SourceFileLike): number;
+    function rangeContainsRange(r1: TextRange, r2: TextRange): boolean;
+    function rangeContainsPosition(r: TextRange, pos: number): boolean;
+    function rangeContainsPositionExclusive(r: TextRange, pos: number): boolean;
+    function startEndContainsRange(start: number, end: number, range: TextRange): boolean;
+    function rangeContainsStartEnd(range: TextRange, start: number, end: number): boolean;
+    function rangeOverlapsWithStartEnd(r1: TextRange, start: number, end: number): boolean;
+    function startEndOverlapsWithStartEnd(start1: number, end1: number, start2: number, end2: number): boolean;
+    /**
+     * Assumes `candidate.start <= position` holds.
+     */
+    function positionBelongsToNode(candidate: Node, position: number, sourceFile: SourceFile): boolean;
+    function findListItemInfo(node: Node): ListItemInfo | undefined;
+    function hasChildOfKind(n: Node, kind: SyntaxKind, sourceFile: SourceFile): boolean;
+    function findChildOfKind<T extends Node>(n: Node, kind: T["kind"], sourceFile: SourceFileLike): T | undefined;
+    function findContainingList(node: Node): SyntaxList | undefined;
+    /**
+     * Gets the token whose text has range [start, end) and
+     * position >= start and (position < end or (position === end && token is literal or keyword or identifier))
+     */
+    function getTouchingPropertyName(sourceFile: SourceFile, position: number): Node;
+    /**
+     * Returns the token if position is in [start, end).
+     * If position === end, returns the preceding token if includeItemAtEndPosition(previousToken) === true
+     */
+    function getTouchingToken(sourceFile: SourceFile, position: number, includeJsDocComment: boolean, includePrecedingTokenAtEndPosition?: (n: Node) => boolean): Node;
+    /** Returns a token if position is in [start-of-leading-trivia, end) */
+    function getTokenAtPosition(sourceFile: SourceFile, position: number, includeJsDocComment: boolean, includeEndPosition?: boolean): Node;
+    /**
+     * The token on the left of the position is the token that strictly includes the position
+     * or sits to the left of the cursor if it is on a boundary. For example
+     *
+     *   fo|o               -> will return foo
+     *   foo <comment> |bar -> will return foo
+     *
+     */
+    function findTokenOnLeftOfPosition(file: SourceFile, position: number): Node | undefined;
+    function findNextToken(previousToken: Node, parent: Node, sourceFile: SourceFile): Node | undefined;
+    /**
+     * Finds the rightmost token satisfying `token.end <= position`,
+     * excluding `JsxText` tokens containing only whitespace.
+     */
+    function findPrecedingToken(position: number, sourceFile: SourceFile, startNode?: Node, includeJsDoc?: boolean): Node | undefined;
+    function isInString(sourceFile: SourceFile, position: number, previousToken?: Node | undefined): boolean;
+    /**
+     * returns true if the position is in between the open and close elements of an JSX expression.
+     */
+    function isInsideJsxElementOrAttribute(sourceFile: SourceFile, position: number): boolean;
+    function isInTemplateString(sourceFile: SourceFile, position: number): boolean;
+    function findPrecedingMatchingToken(token: Node, matchingTokenKind: SyntaxKind, sourceFile: SourceFile): Node | undefined;
+    interface PossibleTypeArgumentInfo {
+        readonly called: Identifier;
+        readonly nTypeArguments: number;
+    }
+    function isPossiblyTypeArgumentPosition(tokenIn: Node, sourceFile: SourceFile): PossibleTypeArgumentInfo | undefined;
+    /**
+     * Returns true if the cursor at position in sourceFile is within a comment.
+     *
+     * @param tokenAtPosition Must equal `getTokenAtPosition(sourceFile, position)
+     * @param predicate Additional predicate to test on the comment range.
+     */
+    function isInComment(sourceFile: SourceFile, position: number, tokenAtPosition?: Node, predicate?: (c: CommentRange) => boolean): boolean;
+    function hasDocComment(sourceFile: SourceFile, position: number): boolean | undefined;
+    function getNodeModifiers(node: Node): string;
+    function getTypeArgumentOrTypeParameterList(node: Node): NodeArray<Node> | undefined;
+    function isComment(kind: SyntaxKind): boolean;
+    function isStringOrRegularExpressionOrTemplateLiteral(kind: SyntaxKind): boolean;
+    function isPunctuation(kind: SyntaxKind): boolean;
+    function isInsideTemplateLiteral(node: TemplateLiteralToken, position: number, sourceFile: SourceFile): boolean;
+    function isAccessibilityModifier(kind: SyntaxKind): boolean;
+    function cloneCompilerOptions(options: CompilerOptions): CompilerOptions;
+    function isArrayLiteralOrObjectLiteralDestructuringPattern(node: Node): boolean;
+    function isInReferenceComment(sourceFile: SourceFile, position: number): boolean;
+    function isInNonReferenceComment(sourceFile: SourceFile, position: number): boolean;
+    function createTextSpanFromNode(node: Node, sourceFile?: SourceFile): TextSpan;
+    function createTextSpanFromRange(range: TextRange): TextSpan;
+    function createTextRangeFromSpan(span: TextSpan): TextRange;
+    function createTextChangeFromStartLength(start: number, length: number, newText: string): TextChange;
+    function createTextChange(span: TextSpan, newText: string): TextChange;
+    const typeKeywords: ReadonlyArray<SyntaxKind>;
+    function isTypeKeyword(kind: SyntaxKind): boolean;
+    /** True if the symbol is for an external module, as opposed to a namespace. */
+    function isExternalModuleSymbol(moduleSymbol: Symbol): boolean;
+    /** Returns `true` the first time it encounters a node and `false` afterwards. */
+    type NodeSeenTracker<T = Node> = (node: T) => boolean;
+    function nodeSeenTracker<T extends Node>(): NodeSeenTracker<T>;
+    function getSnapshotText(snap: IScriptSnapshot): string;
+    function repeatString(str: string, count: number): string;
+    function skipConstraint(type: Type): Type;
+    function getNameFromPropertyName(name: PropertyName): string | undefined;
+    function programContainsEs6Modules(program: Program): boolean;
+    function compilerOptionsIndicateEs6Modules(compilerOptions: CompilerOptions): boolean;
+    function hostUsesCaseSensitiveFileNames(host: LanguageServiceHost): boolean;
+    function hostGetCanonicalFileName(host: LanguageServiceHost): GetCanonicalFileName;
+    function makeImportIfNecessary(defaultImport: Identifier | undefined, namedImports: ReadonlyArray<ImportSpecifier> | undefined, moduleSpecifier: string, quotePreference: QuotePreference): ImportDeclaration | undefined;
+    function makeImport(defaultImport: Identifier | undefined, namedImports: ReadonlyArray<ImportSpecifier> | undefined, moduleSpecifier: string | Expression, quotePreference: QuotePreference): ImportDeclaration;
+    function makeStringLiteral(text: string, quotePreference: QuotePreference): StringLiteral;
+    enum QuotePreference {
+        Single = 0,
+        Double = 1
+    }
+    function getQuotePreference(sourceFile: SourceFile, preferences: UserPreferences): QuotePreference;
+    function symbolNameNoDefault(symbol: Symbol): string | undefined;
+    function symbolEscapedNameNoDefault(symbol: Symbol): __String | undefined;
+    function getPropertySymbolFromBindingElement(checker: TypeChecker, bindingElement: BindingElement & {
+        name: Identifier;
+    }): Symbol | undefined;
+    /**
+     * Find symbol of the given property-name and add the symbol to the given result array
+     * @param symbol a symbol to start searching for the given propertyName
+     * @param propertyName a name of property to search for
+     * @param result an array of symbol of found property symbols
+     * @param previousIterationSymbolsCache a cache of symbol from previous iterations of calling this function to prevent infinite revisiting of the same symbol.
+     *                                The value of previousIterationSymbol is undefined when the function is first called.
+     */
+    function getPropertySymbolsFromBaseTypes<T>(symbol: Symbol, propertyName: string, checker: TypeChecker, cb: (symbol: Symbol) => T | undefined): T | undefined;
+    function isMemberSymbolInBaseType(memberSymbol: Symbol, checker: TypeChecker): boolean;
+    class NodeSet {
+        private map;
+        add(node: Node): void;
+        has(node: Node): boolean;
+        forEach(cb: (node: Node) => void): void;
+        some(pred: (node: Node) => boolean): boolean;
+    }
+    function getParentNodeInSpan(node: Node | undefined, file: SourceFile, span: TextSpan): Node | undefined;
+}
+declare namespace ts {
+    function isFirstDeclarationOfSymbolParameter(symbol: Symbol): boolean;
+    function symbolPart(text: string, symbol: Symbol): SymbolDisplayPart;
+    function displayPart(text: string, kind: SymbolDisplayPartKind): SymbolDisplayPart;
+    function spacePart(): SymbolDisplayPart;
+    function keywordPart(kind: SyntaxKind): SymbolDisplayPart;
+    function punctuationPart(kind: SyntaxKind): SymbolDisplayPart;
+    function operatorPart(kind: SyntaxKind): SymbolDisplayPart;
+    function textOrKeywordPart(text: string): SymbolDisplayPart;
+    function textPart(text: string): SymbolDisplayPart;
+    /**
+     * The default is CRLF.
+     */
+    function getNewLineOrDefaultFromHost(host: LanguageServiceHost | LanguageServiceShimHost, formatSettings?: FormatCodeSettings): string;
+    function lineBreakPart(): SymbolDisplayPart;
+    function mapToDisplayParts(writeDisplayParts: (writer: DisplayPartsSymbolWriter) => void): SymbolDisplayPart[];
+    function typeToDisplayParts(typechecker: TypeChecker, type: Type, enclosingDeclaration?: Node, flags?: TypeFormatFlags): SymbolDisplayPart[];
+    function symbolToDisplayParts(typeChecker: TypeChecker, symbol: Symbol, enclosingDeclaration?: Node, meaning?: SymbolFlags, flags?: SymbolFormatFlags): SymbolDisplayPart[];
+    function signatureToDisplayParts(typechecker: TypeChecker, signature: Signature, enclosingDeclaration?: Node, flags?: TypeFormatFlags): SymbolDisplayPart[];
+    function isImportOrExportSpecifierName(location: Node): location is Identifier;
+    /**
+     * Strip off existed single quotes or double quotes from a given string
+     *
+     * @return non-quoted string
+     */
+    function stripQuotes(name: string): string;
+    function startsWithQuote(name: string): boolean;
+    function scriptKindIs(fileName: string, host: LanguageServiceHost, ...scriptKinds: ScriptKind[]): boolean;
+    function getScriptKind(fileName: string, host?: LanguageServiceHost): ScriptKind;
+    function getUniqueSymbolId(symbol: Symbol, checker: TypeChecker): number;
+    function getFirstNonSpaceCharacterPosition(text: string, position: number): number;
+    /**
+     * Creates a deep, memberwise clone of a node with no source map location.
+     *
+     * WARNING: This is an expensive operation and is only intended to be used in refactorings
+     * and code fixes (because those are triggered by explicit user actions).
+     */
+    function getSynthesizedDeepClone<T extends Node | undefined>(node: T, includeTrivia?: boolean): T;
+    function getSynthesizedDeepClones<T extends Node>(nodes: NodeArray<T>, includeTrivia?: boolean): NodeArray<T>;
+    function getSynthesizedDeepClones<T extends Node>(nodes: NodeArray<T> | undefined, includeTrivia?: boolean): NodeArray<T> | undefined;
+    /**
+     * Sets EmitFlags to suppress leading and trailing trivia on the node.
+     */
+    function suppressLeadingAndTrailingTrivia(node: Node): void;
+    /**
+     * Sets EmitFlags to suppress leading trivia on the node.
+     */
+    function suppressLeadingTrivia(node: Node): void;
+    /**
+     * Sets EmitFlags to suppress trailing trivia on the node.
+     */
+    function suppressTrailingTrivia(node: Node): void;
+    function getUniqueName(baseName: string, sourceFile: SourceFile): string;
+    /**
+     * @return The index of the (only) reference to the extracted symbol.  We want the cursor
+     * to be on the reference, rather than the declaration, because it's closer to where the
+     * user was before extracting it.
+     */
+    function getRenameLocation(edits: ReadonlyArray<FileTextChanges>, renameFilename: string, name: string, preferLastLocation: boolean): number;
+}
+declare namespace ts {
+    function createClassifier(): Classifier;
+    function getSemanticClassifications(typeChecker: TypeChecker, cancellationToken: CancellationToken, sourceFile: SourceFile, classifiableNames: UnderscoreEscapedMap<true>, span: TextSpan): ClassifiedSpan[];
+    function getEncodedSemanticClassifications(typeChecker: TypeChecker, cancellationToken: CancellationToken, sourceFile: SourceFile, classifiableNames: UnderscoreEscapedMap<true>, span: TextSpan): Classifications;
+    function getSyntacticClassifications(cancellationToken: CancellationToken, sourceFile: SourceFile, span: TextSpan): ClassifiedSpan[];
+    function getEncodedSyntacticClassifications(cancellationToken: CancellationToken, sourceFile: SourceFile, span: TextSpan): Classifications;
+}
+declare namespace ts.Completions.PathCompletions {
+    interface NameAndKind {
+        readonly name: string;
+        readonly kind: ScriptElementKind.scriptElement | ScriptElementKind.directory | ScriptElementKind.externalModuleName;
+    }
+    interface PathCompletion extends NameAndKind {
+        readonly span: TextSpan | undefined;
+    }
+    function getStringLiteralCompletionsFromModuleNames(sourceFile: SourceFile, node: LiteralExpression, compilerOptions: CompilerOptions, host: LanguageServiceHost, typeChecker: TypeChecker): ReadonlyArray<PathCompletion>;
+    function getTripleSlashReferenceCompletion(sourceFile: SourceFile, position: number, compilerOptions: CompilerOptions, host: LanguageServiceHost): ReadonlyArray<PathCompletion> | undefined;
+}
+declare namespace ts.Completions {
+    type Log = (message: string) => void;
+    function getCompletionsAtPosition(host: LanguageServiceHost, program: Program, log: Log, sourceFile: SourceFile, position: number, preferences: UserPreferences, triggerCharacter: CompletionsTriggerCharacter | undefined): CompletionInfo | undefined;
+    interface CompletionEntryIdentifier {
+        name: string;
+        source?: string;
+    }
+    function getCompletionEntryDetails(program: Program, log: Log, sourceFile: SourceFile, position: number, entryId: CompletionEntryIdentifier, host: LanguageServiceHost, formatContext: formatting.FormatContext, getCanonicalFileName: GetCanonicalFileName, preferences: UserPreferences, cancellationToken: CancellationToken): CompletionEntryDetails | undefined;
+    function getCompletionEntrySymbol(program: Program, log: Log, sourceFile: SourceFile, position: number, entryId: CompletionEntryIdentifier): Symbol | undefined;
+}
+declare namespace ts.DocumentHighlights {
+    function getDocumentHighlights(program: Program, cancellationToken: CancellationToken, sourceFile: SourceFile, position: number, sourceFilesToSearch: ReadonlyArray<SourceFile>): DocumentHighlights[] | undefined;
+}
+declare namespace ts {
+    /**
+     * The document registry represents a store of SourceFile objects that can be shared between
+     * multiple LanguageService instances. A LanguageService instance holds on the SourceFile (AST)
+     * of files in the context.
+     * SourceFile objects account for most of the memory usage by the language service. Sharing
+     * the same DocumentRegistry instance between different instances of LanguageService allow
+     * for more efficient memory utilization since all projects will share at least the library
+     * file (lib.d.ts).
+     *
+     * A more advanced use of the document registry is to serialize sourceFile objects to disk
+     * and re-hydrate them when needed.
+     *
+     * To create a default DocumentRegistry, use createDocumentRegistry to create one, and pass it
+     * to all subsequent createLanguageService calls.
+     */
+    interface DocumentRegistry {
+        /**
+         * Request a stored SourceFile with a given fileName and compilationSettings.
+         * The first call to acquire will call createLanguageServiceSourceFile to generate
+         * the SourceFile if was not found in the registry.
+         *
+         * @param fileName The name of the file requested
+         * @param compilationSettings Some compilation settings like target affects the
+         * shape of a the resulting SourceFile. This allows the DocumentRegistry to store
+         * multiple copies of the same file for different compilation settings.
+         * @param scriptSnapshot Text of the file. Only used if the file was not found
+         * in the registry and a new one was created.
+         * @param version Current version of the file. Only used if the file was not found
+         * in the registry and a new one was created.
+         */
+        acquireDocument(fileName: string, compilationSettings: CompilerOptions, scriptSnapshot: IScriptSnapshot, version: string, scriptKind?: ScriptKind): SourceFile;
+        acquireDocumentWithKey(fileName: string, path: Path, compilationSettings: CompilerOptions, key: DocumentRegistryBucketKey, scriptSnapshot: IScriptSnapshot, version: string, scriptKind?: ScriptKind): SourceFile;
+        /**
+         * Request an updated version of an already existing SourceFile with a given fileName
+         * and compilationSettings. The update will in-turn call updateLanguageServiceSourceFile
+         * to get an updated SourceFile.
+         *
+         * @param fileName The name of the file requested
+         * @param compilationSettings Some compilation settings like target affects the
+         * shape of a the resulting SourceFile. This allows the DocumentRegistry to store
+         * multiple copies of the same file for different compilation settings.
+         * @param scriptSnapshot Text of the file.
+         * @param version Current version of the file.
+         */
+        updateDocument(fileName: string, compilationSettings: CompilerOptions, scriptSnapshot: IScriptSnapshot, version: string, scriptKind?: ScriptKind): SourceFile;
+        updateDocumentWithKey(fileName: string, path: Path, compilationSettings: CompilerOptions, key: DocumentRegistryBucketKey, scriptSnapshot: IScriptSnapshot, version: string, scriptKind?: ScriptKind): SourceFile;
+        getKeyForCompilationSettings(settings: CompilerOptions): DocumentRegistryBucketKey;
+        /**
+         * Informs the DocumentRegistry that a file is not needed any longer.
+         *
+         * Note: It is not allowed to call release on a SourceFile that was not acquired from
+         * this registry originally.
+         *
+         * @param fileName The name of the file to be released
+         * @param compilationSettings The compilation settings used to acquire the file
+         */
+        releaseDocument(fileName: string, compilationSettings: CompilerOptions): void;
+        releaseDocumentWithKey(path: Path, key: DocumentRegistryBucketKey): void;
+        getLanguageServiceRefCounts(path: Path): [string, number | undefined][];
+        reportStats(): string;
+    }
+    interface ExternalDocumentCache {
+        setDocument(key: DocumentRegistryBucketKey, path: Path, sourceFile: SourceFile): void;
+        getDocument(key: DocumentRegistryBucketKey, path: Path): SourceFile | undefined;
+    }
+    type DocumentRegistryBucketKey = string & {
+        __bucketKey: any;
+    };
+    function createDocumentRegistry(useCaseSensitiveFileNames?: boolean, currentDirectory?: string): DocumentRegistry;
+    function createDocumentRegistryInternal(useCaseSensitiveFileNames?: boolean, currentDirectory?: string, externalCache?: ExternalDocumentCache): DocumentRegistry;
+}
+declare namespace ts.FindAllReferences {
+    interface ImportsResult {
+        /** For every import of the symbol, the location and local symbol for the import. */
+        importSearches: ReadonlyArray<[Identifier, Symbol]>;
+        /** For rename imports/exports `{ foo as bar }`, `foo` is not a local, so it may be added as a reference immediately without further searching. */
+        singleReferences: ReadonlyArray<Identifier | StringLiteral>;
+        /** List of source files that may (or may not) use the symbol via a namespace. (For UMD modules this is every file.) */
+        indirectUsers: ReadonlyArray<SourceFile>;
+    }
+    type ImportTracker = (exportSymbol: Symbol, exportInfo: ExportInfo, isForRename: boolean) => ImportsResult;
+    /** Creates the imports map and returns an ImportTracker that uses it. Call this lazily to avoid calling `getDirectImportsMap` unnecessarily.  */
+    function createImportTracker(sourceFiles: ReadonlyArray<SourceFile>, sourceFilesSet: ReadonlyMap<true>, checker: TypeChecker, cancellationToken: CancellationToken): ImportTracker;
+    /** Info about an exported symbol to perform recursive search on. */
+    interface ExportInfo {
+        exportingModuleSymbol: Symbol;
+        exportKind: ExportKind;
+    }
+    enum ExportKind {
+        Named = 0,
+        Default = 1,
+        ExportEquals = 2
+    }
+    enum ImportExport {
+        Import = 0,
+        Export = 1
+    }
+    type ModuleReference = {
+        kind: "import";
+        literal: StringLiteralLike;
+    }
+    /** <reference path> or <reference types> */
+     | {
+        kind: "reference";
+        referencingFile: SourceFile;
+        ref: FileReference;
+    };
+    function findModuleReferences(program: Program, sourceFiles: ReadonlyArray<SourceFile>, searchModuleSymbol: Symbol): ModuleReference[];
+    interface ImportedSymbol {
+        kind: ImportExport.Import;
+        symbol: Symbol;
+        isNamedImport: boolean;
+    }
+    interface ExportedSymbol {
+        kind: ImportExport.Export;
+        symbol: Symbol;
+        exportInfo: ExportInfo;
+    }
+    /**
+     * Given a local reference, we might notice that it's an import/export and recursively search for references of that.
+     * If at an import, look locally for the symbol it imports.
+     * If an an export, look for all imports of it.
+     * This doesn't handle export specifiers; that is done in `getReferencesAtExportSpecifier`.
+     * @param comingFromExport If we are doing a search for all exports, don't bother looking backwards for the imported symbol, since that's the reason we're here.
+     */
+    function getImportOrExportSymbol(node: Node, symbol: Symbol, checker: TypeChecker, comingFromExport: boolean): ImportedSymbol | ExportedSymbol | undefined;
+    function getExportInfo(exportSymbol: Symbol, exportKind: ExportKind, checker: TypeChecker): ExportInfo | undefined;
+}
+declare namespace ts.FindAllReferences {
+    interface SymbolAndEntries {
+        definition: Definition | undefined;
+        references: Entry[];
+    }
+    type Definition = {
+        type: "symbol";
+        symbol: Symbol;
+    } | {
+        type: "label";
+        node: Identifier;
+    } | {
+        type: "keyword";
+        node: Node;
+    } | {
+        type: "this";
+        node: Node;
+    } | {
+        type: "string";
+        node: StringLiteral;
+    };
+    type Entry = NodeEntry | SpanEntry;
+    interface NodeEntry {
+        type: "node";
+        node: Node;
+        isInString?: true;
+    }
+    interface SpanEntry {
+        type: "span";
+        fileName: string;
+        textSpan: TextSpan;
+    }
+    function nodeEntry(node: Node, isInString?: true): NodeEntry;
+    interface Options {
+        readonly findInStrings?: boolean;
+        readonly findInComments?: boolean;
+        /**
+         * True if we are renaming the symbol.
+         * If so, we will find fewer references -- if it is referenced by several different names, we sill only find references for the original name.
+         */
+        readonly isForRename?: boolean;
+        /** True if we are searching for implementations. We will have a different method of adding references if so. */
+        readonly implementations?: boolean;
+    }
+    function findReferencedSymbols(program: Program, cancellationToken: CancellationToken, sourceFiles: ReadonlyArray<SourceFile>, sourceFile: SourceFile, position: number): ReferencedSymbol[] | undefined;
+    function getImplementationsAtPosition(program: Program, cancellationToken: CancellationToken, sourceFiles: ReadonlyArray<SourceFile>, sourceFile: SourceFile, position: number): ImplementationLocation[] | undefined;
+    function findReferencedEntries(program: Program, cancellationToken: CancellationToken, sourceFiles: ReadonlyArray<SourceFile>, sourceFile: SourceFile, position: number, options?: Options): ReferenceEntry[] | undefined;
+    function getReferenceEntriesForNode(position: number, node: Node, program: Program, sourceFiles: ReadonlyArray<SourceFile>, cancellationToken: CancellationToken, options?: Options, sourceFilesSet?: ReadonlyMap<true>): Entry[] | undefined;
+    function toHighlightSpan(entry: Entry): {
+        fileName: string;
+        span: HighlightSpan;
+    };
+}
+/** Encapsulates the core find-all-references algorithm. */
+declare namespace ts.FindAllReferences.Core {
+    /** Core find-all-references algorithm. Handles special cases before delegating to `getReferencedSymbolsForSymbol`. */
+    function getReferencedSymbolsForNode(position: number, node: Node, program: Program, sourceFiles: ReadonlyArray<SourceFile>, cancellationToken: CancellationToken, options?: Options, sourceFilesSet?: ReadonlyMap<true>): SymbolAndEntries[] | undefined;
+    /** Used as a quick check for whether a symbol is used at all in a file (besides its definition). */
+    function isSymbolReferencedInFile(definition: Identifier, checker: TypeChecker, sourceFile: SourceFile): boolean;
+    function eachSymbolReferenceInFile<T>(definition: Identifier, checker: TypeChecker, sourceFile: SourceFile, cb: (token: Identifier) => T): T | undefined;
+    /**
+     * Given an initial searchMeaning, extracted from a location, widen the search scope based on the declarations
+     * of the corresponding symbol. e.g. if we are searching for "Foo" in value position, but "Foo" references a class
+     * then we need to widen the search to include type positions as well.
+     * On the contrary, if we are searching for "Bar" in type position and we trace bar to an interface, and an uninstantiated
+     * module, we want to keep the search limited to only types, as the two declarations (interface and uninstantiated module)
+     * do not intersect in any of the three spaces.
+     */
+    function getIntersectingMeaningFromDeclarations(node: Node, symbol: Symbol): SemanticMeaning;
+    function getReferenceEntriesForShorthandPropertyAssignment(node: Node, checker: TypeChecker, addReference: (node: Node) => void): void;
+}
+declare namespace ts {
+    function getEditsForFileRename(program: Program, oldFileOrDirPath: string, newFileOrDirPath: string, host: LanguageServiceHost, formatContext: formatting.FormatContext, preferences: UserPreferences): ReadonlyArray<FileTextChanges>;
+}
+declare namespace ts.GoToDefinition {
+    function getDefinitionAtPosition(program: Program, sourceFile: SourceFile, position: number): DefinitionInfo[] | undefined;
+    function getReferenceAtPosition(sourceFile: SourceFile, position: number, program: Program): {
+        fileName: string;
+        file: SourceFile;
+    } | undefined;
+    function getTypeDefinitionAtPosition(typeChecker: TypeChecker, sourceFile: SourceFile, position: number): DefinitionInfo[] | undefined;
+    function getDefinitionAndBoundSpan(program: Program, sourceFile: SourceFile, position: number): DefinitionInfoAndBoundSpan | undefined;
+    function findReferenceInPosition(refs: ReadonlyArray<FileReference>, pos: number): FileReference | undefined;
+}
+declare namespace ts.JsDoc {
+    function getJsDocCommentsFromDeclarations(declarations: ReadonlyArray<Declaration>): SymbolDisplayPart[];
+    function getJsDocTagsFromDeclarations(declarations?: Declaration[]): JSDocTagInfo[];
+    function getJSDocTagNameCompletions(): CompletionEntry[];
+    const getJSDocTagNameCompletionDetails: typeof getJSDocTagCompletionDetails;
+    function getJSDocTagCompletions(): CompletionEntry[];
+    function getJSDocTagCompletionDetails(name: string): CompletionEntryDetails;
+    function getJSDocParameterNameCompletions(tag: JSDocParameterTag): CompletionEntry[];
+    function getJSDocParameterNameCompletionDetails(name: string): CompletionEntryDetails;
+    /**
+     * Checks if position points to a valid position to add JSDoc comments, and if so,
+     * returns the appropriate template. Otherwise returns an empty string.
+     * Valid positions are
+     *      - outside of comments, statements, and expressions, and
+     *      - preceding a:
+     *          - function/constructor/method declaration
+     *          - class declarations
+     *          - variable statements
+     *          - namespace declarations
+     *          - interface declarations
+     *          - method signatures
+     *          - type alias declarations
+     *
+     * Hosts should ideally check that:
+     * - The line is all whitespace up to 'position' before performing the insertion.
+     * - If the keystroke sequence "/\*\*" induced the call, we also check that the next
+     * non-whitespace character is '*', which (approximately) indicates whether we added
+     * the second '*' to complete an existing (JSDoc) comment.
+     * @param fileName The file in which to perform the check.
+     * @param position The (character-indexed) position in the file where the check should
+     * be performed.
+     */
+    function getDocCommentTemplateAtPosition(newLine: string, sourceFile: SourceFile, position: number): TextInsertion | undefined;
+}
+declare namespace ts.NavigateTo {
+    function getNavigateToItems(sourceFiles: ReadonlyArray<SourceFile>, checker: TypeChecker, cancellationToken: CancellationToken, searchValue: string, maxResultCount: number | undefined, excludeDtsFiles: boolean): NavigateToItem[];
+}
+declare namespace ts.NavigationBar {
+    function getNavigationBarItems(sourceFile: SourceFile, cancellationToken: CancellationToken): NavigationBarItem[];
+    function getNavigationTree(sourceFile: SourceFile, cancellationToken: CancellationToken): NavigationTree;
+}
+declare namespace ts.OrganizeImports {
+    /**
+     * Organize imports by:
+     *   1) Removing unused imports
+     *   2) Coalescing imports from the same module
+     *   3) Sorting imports
+     */
+    function organizeImports(sourceFile: SourceFile, formatContext: formatting.FormatContext, host: LanguageServiceHost, program: Program, _preferences: UserPreferences): FileTextChanges[];
+    /**
+     * @param importGroup a list of ImportDeclarations, all with the same module name.
+     */
+    function coalesceImports(importGroup: ReadonlyArray<ImportDeclaration>): ReadonlyArray<ImportDeclaration>;
+    /**
+     * @param exportGroup a list of ExportDeclarations, all with the same module name.
+     */
+    function coalesceExports(exportGroup: ReadonlyArray<ExportDeclaration>): ReadonlyArray<ExportDeclaration>;
+    function compareModuleSpecifiers(m1: Expression, m2: Expression): Comparison;
+}
+declare namespace ts.OutliningElementsCollector {
+    function collectElements(sourceFile: SourceFile, cancellationToken: CancellationToken): OutliningSpan[];
+}
+declare namespace ts {
+    enum PatternMatchKind {
+        exact = 0,
+        prefix = 1,
+        substring = 2,
+        camelCase = 3
+    }
+    interface PatternMatch {
+        kind: PatternMatchKind;
+        isCaseSensitive: boolean;
+    }
+    interface PatternMatcher {
+        getMatchForLastSegmentOfPattern(candidate: string): PatternMatch | undefined;
+        getFullMatch(candidateContainers: ReadonlyArray<string>, candidate: string): PatternMatch | undefined;
+        patternContainsDots: boolean;
+    }
+    function createPatternMatcher(pattern: string): PatternMatcher | undefined;
+    function breakIntoCharacterSpans(identifier: string): TextSpan[];
+    function breakIntoWordSpans(identifier: string): TextSpan[];
+}
+declare namespace ts {
+    function preProcessFile(sourceText: string, readImportFiles?: boolean, detectJavaScriptImports?: boolean): PreProcessedFileInfo;
+}
+declare namespace ts.Rename {
+    function getRenameInfo(typeChecker: TypeChecker, defaultLibFileName: string, getCanonicalFileName: GetCanonicalFileName, sourceFile: SourceFile, position: number): RenameInfo;
+}
+declare namespace ts.SignatureHelp {
+    function getSignatureHelpItems(program: Program, sourceFile: SourceFile, position: number, cancellationToken: CancellationToken): SignatureHelpItems | undefined;
+    interface ArgumentInfoForCompletions {
+        readonly invocation: CallLikeExpression;
+        readonly argumentIndex: number;
+        readonly argumentCount: number;
+    }
+    function getArgumentInfoForCompletions(node: Node, position: number, sourceFile: SourceFile): ArgumentInfoForCompletions | undefined;
+}
+declare namespace ts {
+    function computeSuggestionDiagnostics(sourceFile: SourceFile, program: Program, cancellationToken: CancellationToken): DiagnosticWithLocation[];
+}
+declare namespace ts.SymbolDisplay {
+    function getSymbolKind(typeChecker: TypeChecker, symbol: Symbol, location: Node): ScriptElementKind;
+    function getSymbolModifiers(symbol: Symbol): string;
+    interface SymbolDisplayPartsDocumentationAndSymbolKind {
+        displayParts: SymbolDisplayPart[];
+        documentation: SymbolDisplayPart[];
+        symbolKind: ScriptElementKind;
+        tags: JSDocTagInfo[] | undefined;
+    }
+    function getSymbolDisplayPartsDocumentationAndSymbolKind(typeChecker: TypeChecker, symbol: Symbol, sourceFile: SourceFile, enclosingDeclaration: Node | undefined, location: Node, semanticMeaning?: SemanticMeaning, alias?: Symbol): SymbolDisplayPartsDocumentationAndSymbolKind;
+}
+declare namespace ts {
+    interface TranspileOptions {
+        compilerOptions?: CompilerOptions;
+        fileName?: string;
+        reportDiagnostics?: boolean;
+        moduleName?: string;
+        renamedDependencies?: MapLike<string>;
+        transformers?: CustomTransformers;
+    }
+    interface TranspileOutput {
+        outputText: string;
+        diagnostics?: Diagnostic[];
+        sourceMapText?: string;
+    }
+    function transpileModule(input: string, transpileOptions: TranspileOptions): TranspileOutput;
+    function transpile(input: string, compilerOptions?: CompilerOptions, fileName?: string, diagnostics?: Diagnostic[], moduleName?: string): string;
+    /** JS users may pass in string values for enum compiler options (such as ModuleKind), so convert. */
+    function fixupCompilerOptions(options: CompilerOptions, diagnostics: Diagnostic[]): CompilerOptions;
+}
+declare namespace ts.formatting {
+    enum FormattingRequestKind {
+        FormatDocument = 0,
+        FormatSelection = 1,
+        FormatOnEnter = 2,
+        FormatOnSemicolon = 3,
+        FormatOnOpeningCurlyBrace = 4,
+        FormatOnClosingCurlyBrace = 5
+    }
+    class FormattingContext {
+        readonly sourceFile: SourceFileLike;
+        formattingRequestKind: FormattingRequestKind;
+        options: FormatCodeSettings;
+        currentTokenSpan: TextRangeWithKind;
+        nextTokenSpan: TextRangeWithKind;
+        contextNode: Node;
+        currentTokenParent: Node;
+        nextTokenParent: Node;
+        private contextNodeAllOnSameLine;
+        private nextNodeAllOnSameLine;
+        private tokensAreOnSameLine;
+        private contextNodeBlockIsOnOneLine;
+        private nextNodeBlockIsOnOneLine;
+        constructor(sourceFile: SourceFileLike, formattingRequestKind: FormattingRequestKind, options: FormatCodeSettings);
+        updateContext(currentRange: TextRangeWithKind, currentTokenParent: Node, nextRange: TextRangeWithKind, nextTokenParent: Node, commonParent: Node): void;
+        ContextNodeAllOnSameLine(): boolean;
+        NextNodeAllOnSameLine(): boolean;
+        TokensAreOnSameLine(): boolean;
+        ContextNodeBlockIsOnOneLine(): boolean;
+        NextNodeBlockIsOnOneLine(): boolean;
+        private NodeIsOnOneLine;
+        private BlockIsOnOneLine;
+    }
+}
+declare namespace ts.formatting {
+    interface FormattingScanner {
+        advance(): void;
+        isOnToken(): boolean;
+        readTokenInfo(n: Node): TokenInfo;
+        getCurrentLeadingTrivia(): TextRangeWithKind[] | undefined;
+        lastTrailingTriviaWasNewLine(): boolean;
+        skipToEndOf(node: Node): void;
+    }
+    function getFormattingScanner<T>(text: string, languageVariant: LanguageVariant, startPos: number, endPos: number, cb: (scanner: FormattingScanner) => T): T;
+}
+declare namespace ts.formatting {
+    interface Rule {
+        readonly debugName: string;
+        readonly context: ReadonlyArray<ContextPredicate>;
+        readonly action: RuleAction;
+        readonly flags: RuleFlags;
+    }
+    type ContextPredicate = (context: FormattingContext) => boolean;
+    const anyContext: ReadonlyArray<ContextPredicate>;
+    enum RuleAction {
+        Ignore = 1,
+        Space = 2,
+        NewLine = 4,
+        Delete = 8
+    }
+    enum RuleFlags {
+        None = 0,
+        CanDeleteNewLines = 1
+    }
+    interface TokenRange {
+        readonly tokens: ReadonlyArray<SyntaxKind>;
+        readonly isSpecific: boolean;
+    }
+}
+declare namespace ts.formatting {
+    interface RuleSpec {
+        readonly leftTokenRange: TokenRange;
+        readonly rightTokenRange: TokenRange;
+        readonly rule: Rule;
+    }
+    function getAllRules(): RuleSpec[];
+}
+declare namespace ts.formatting {
+    function getFormatContext(options: FormatCodeSettings): FormatContext;
+    type RulesMap = (context: FormattingContext) => Rule | undefined;
+}
+declare namespace ts.formatting {
+    interface FormatContext {
+        readonly options: FormatCodeSettings;
+        readonly getRule: RulesMap;
+    }
+    interface TextRangeWithKind extends TextRange {
+        kind: SyntaxKind;
+    }
+    interface TextRangeWithTriviaKind extends TextRange {
+        kind: TriviaKind;
+    }
+    interface TokenInfo {
+        leadingTrivia: TextRangeWithTriviaKind[] | undefined;
+        token: TextRangeWithKind;
+        trailingTrivia: TextRangeWithTriviaKind[] | undefined;
+    }
+    function formatOnEnter(position: number, sourceFile: SourceFile, formatContext: FormatContext): TextChange[];
+    function formatOnSemicolon(position: number, sourceFile: SourceFile, formatContext: FormatContext): TextChange[];
+    function formatOnOpeningCurly(position: number, sourceFile: SourceFile, formatContext: FormatContext): TextChange[];
+    function formatOnClosingCurly(position: number, sourceFile: SourceFile, formatContext: FormatContext): TextChange[];
+    function formatDocument(sourceFile: SourceFile, formatContext: FormatContext): TextChange[];
+    function formatSelection(start: number, end: number, sourceFile: SourceFile, formatContext: FormatContext): TextChange[];
+    function formatNodeGivenIndentation(node: Node, sourceFileLike: SourceFileLike, languageVariant: LanguageVariant, initialIndentation: number, delta: number, formatContext: FormatContext): TextChange[];
+    /**
+     * @param precedingToken pass `null` if preceding token was already computed and result was `undefined`.
+     */
+    function getRangeOfEnclosingComment(sourceFile: SourceFile, position: number, onlyMultiLine: boolean, precedingToken?: Node | null, // tslint:disable-line:no-null-keyword
+    tokenAtPosition?: Node, predicate?: (c: CommentRange) => boolean): CommentRange | undefined;
+    function getIndentationString(indentation: number, options: EditorSettings): string;
+}
+declare namespace ts.formatting {
+    namespace SmartIndenter {
+        /**
+         * @param assumeNewLineBeforeCloseBrace
+         * `false` when called on text from a real source file.
+         * `true` when we need to assume `position` is on a newline.
+         *
+         * This is useful for codefixes. Consider
+         * ```
+         * function f() {
+         * |}
+         * ```
+         * with `position` at `|`.
+         *
+         * When inserting some text after an open brace, we would like to get indentation as if a newline was already there.
+         * By default indentation at `position` will be 0 so 'assumeNewLineBeforeCloseBrace' overrides this behavior.
+         */
+        function getIndentation(position: number, sourceFile: SourceFile, options: EditorSettings, assumeNewLineBeforeCloseBrace?: boolean): number;
+        function getIndentationForNode(n: Node, ignoreActualIndentationRange: TextRange, sourceFile: SourceFile, options: EditorSettings): number;
+        function getBaseIndentation(options: EditorSettings): number;
+        function isArgumentAndStartLineOverlapsExpressionBeingCalled(parent: Node, child: Node, childStartLine: number, sourceFile: SourceFileLike): boolean;
+        function childStartsOnTheSameLineWithElseInIfStatement(parent: Node, child: TextRangeWithKind, childStartLine: number, sourceFile: SourceFileLike): boolean;
+        function getContainingList(node: Node, sourceFile: SourceFile): NodeArray<Node> | undefined;
+        /**
+         * Character is the actual index of the character since the beginning of the line.
+         * Column - position of the character after expanding tabs to spaces.
+         * "0\t2$"
+         * value of 'character' for '$' is 3
+         * value of 'column' for '$' is 6 (assuming that tab size is 4)
+         */
+        function findFirstNonWhitespaceCharacterAndColumn(startPos: number, endPos: number, sourceFile: SourceFileLike, options: EditorSettings): {
+            column: number;
+            character: number;
+        };
+        function findFirstNonWhitespaceColumn(startPos: number, endPos: number, sourceFile: SourceFileLike, options: EditorSettings): number;
+        function nodeWillIndentChild(settings: FormatCodeSettings, parent: TextRangeWithKind, child: TextRangeWithKind | undefined, sourceFile: SourceFileLike | undefined, indentByDefault: boolean): boolean;
+        /**
+         * True when the parent node should indent the given child by an explicit rule.
+         * @param isNextChild If true, we are judging indent of a hypothetical child *after* this one, not the current child.
+         */
+        function shouldIndentChildNode(settings: FormatCodeSettings, parent: TextRangeWithKind, child?: Node, sourceFile?: SourceFileLike, isNextChild?: boolean): boolean;
+    }
+}
+declare namespace ts.textChanges {
+    interface ConfigurableStart {
+        /** True to use getStart() (NB, not getFullStart()) without adjustment. */
+        useNonAdjustedStartPosition?: boolean;
+    }
+    interface ConfigurableEnd {
+        /** True to use getEnd() without adjustment. */
+        useNonAdjustedEndPosition?: boolean;
+    }
+    enum Position {
+        FullStart = 0,
+        Start = 1
+    }
+    /**
+     * Usually node.pos points to a position immediately after the previous token.
+     * If this position is used as a beginning of the span to remove - it might lead to removing the trailing trivia of the previous node, i.e:
+     * const x; // this is x
+     *        ^ - pos for the next variable declaration will point here
+     * const y; // this is y
+     *        ^ - end for previous variable declaration
+     * Usually leading trivia of the variable declaration 'y' should not include trailing trivia (whitespace, comment 'this is x' and newline) from the preceding
+     * variable declaration and trailing trivia for 'y' should include (whitespace, comment 'this is y', newline).
+     * By default when removing nodes we adjust start and end positions to respect specification of the trivia above.
+     * If pos\end should be interpreted literally 'useNonAdjustedStartPosition' or 'useNonAdjustedEndPosition' should be set to true
+     */
+    interface ConfigurableStartEnd extends ConfigurableStart, ConfigurableEnd {
+    }
+    const useNonAdjustedPositions: ConfigurableStartEnd;
+    interface InsertNodeOptions {
+        /**
+         * Text to be inserted before the new node
+         */
+        prefix?: string;
+        /**
+         * Text to be inserted after the new node
+         */
+        suffix?: string;
+        /**
+         * Text of inserted node will be formatted with this indentation, otherwise indentation will be inferred from the old node
+         */
+        indentation?: number;
+        /**
+         * Text of inserted node will be formatted with this delta, otherwise delta will be inferred from the new node kind
+         */
+        delta?: number;
+        /**
+         * Do not trim leading white spaces in the edit range
+         */
+        preserveLeadingWhitespace?: boolean;
+    }
+    interface ReplaceWithMultipleNodesOptions extends InsertNodeOptions {
+        readonly joiner?: string;
+    }
+    interface ChangeNodeOptions extends ConfigurableStartEnd, InsertNodeOptions {
+    }
+    interface TextChangesContext {
+        host: LanguageServiceHost;
+        formatContext: formatting.FormatContext;
+    }
+    type TypeAnnotatable = SignatureDeclaration | VariableDeclaration | ParameterDeclaration | PropertyDeclaration | PropertySignature;
+    class ChangeTracker {
+        private readonly newLineCharacter;
+        private readonly formatContext;
+        private readonly changes;
+        private readonly newFiles;
+        private readonly deletedNodesInLists;
+        private readonly classesWithNodesInsertedAtStart;
+        static fromContext(context: TextChangesContext): ChangeTracker;
+        static with(context: TextChangesContext, cb: (tracker: ChangeTracker) => void): FileTextChanges[];
+        /** Public for tests only. Other callers should use `ChangeTracker.with`. */
+        constructor(newLineCharacter: string, formatContext: formatting.FormatContext);
+        deleteRange(sourceFile: SourceFile, range: TextRange): this;
+        /** Warning: This deletes comments too. See `copyComments` in `convertFunctionToEs6Class`. */
+        deleteNode(sourceFile: SourceFile, node: Node, options?: ConfigurableStartEnd): this;
+        deleteNodeRange(sourceFile: SourceFile, startNode: Node, endNode: Node, options?: ConfigurableStartEnd): this;
+        deleteNodeRangeExcludingEnd(sourceFile: SourceFile, startNode: Node, afterEndNode: Node | undefined, options?: ConfigurableStartEnd): void;
+        deleteNodeInList(sourceFile: SourceFile, node: Node): this;
+        replaceRange(sourceFile: SourceFile, range: TextRange, newNode: Node, options?: InsertNodeOptions): this;
+        replaceNode(sourceFile: SourceFile, oldNode: Node, newNode: Node, options?: ChangeNodeOptions): this;
+        replaceNodeRange(sourceFile: SourceFile, startNode: Node, endNode: Node, newNode: Node, options?: ChangeNodeOptions): void;
+        private replaceRangeWithNodes;
+        replaceNodeWithNodes(sourceFile: SourceFile, oldNode: Node, newNodes: ReadonlyArray<Node>, options?: ChangeNodeOptions): this;
+        replaceNodeRangeWithNodes(sourceFile: SourceFile, startNode: Node, endNode: Node, newNodes: ReadonlyArray<Node>, options?: ReplaceWithMultipleNodesOptions & ConfigurableStartEnd): this;
+        private nextCommaToken;
+        replacePropertyAssignment(sourceFile: SourceFile, oldNode: PropertyAssignment, newNode: PropertyAssignment): this;
+        private insertNodeAt;
+        private insertNodesAt;
+        insertNodeAtTopOfFile(sourceFile: SourceFile, newNode: Statement, blankLineBetween: boolean): void;
+        insertNodeBefore(sourceFile: SourceFile, before: Node, newNode: Node, blankLineBetween?: boolean): void;
+        insertModifierBefore(sourceFile: SourceFile, modifier: SyntaxKind, before: Node): void;
+        insertCommentBeforeLine(sourceFile: SourceFile, lineNumber: number, position: number, commentText: string): void;
+        replaceRangeWithText(sourceFile: SourceFile, range: TextRange, text: string): void;
+        private insertText;
+        /** Prefer this over replacing a node with another that has a type annotation, as it avoids reformatting the other parts of the node. */
+        tryInsertTypeAnnotation(sourceFile: SourceFile, node: TypeAnnotatable, type: TypeNode): void;
+        insertTypeParameters(sourceFile: SourceFile, node: SignatureDeclaration, typeParameters: ReadonlyArray<TypeParameterDeclaration>): void;
+        private getOptionsForInsertNodeBefore;
+        insertNodeAtConstructorStart(sourceFile: SourceFile, ctr: ConstructorDeclaration, newStatement: Statement): void;
+        insertNodeAtConstructorEnd(sourceFile: SourceFile, ctr: ConstructorDeclaration, newStatement: Statement): void;
+        private replaceConstructorBody;
+        insertNodeAtEndOfScope(sourceFile: SourceFile, scope: Node, newNode: Node): void;
+        insertNodeAtClassStart(sourceFile: SourceFile, cls: ClassLikeDeclaration, newElement: ClassElement): void;
+        private getInsertNodeAtClassStartPrefixSuffix;
+        insertNodeAfterComma(sourceFile: SourceFile, after: Node, newNode: Node): void;
+        insertNodeAfter(sourceFile: SourceFile, after: Node, newNode: Node): void;
+        insertNodesAfter(sourceFile: SourceFile, after: Node, newNodes: ReadonlyArray<Node>): void;
+        private insertNodeAfterWorker;
+        private getInsertNodeAfterOptions;
+        private getInsertNodeAfterOptionsWorker;
+        insertName(sourceFile: SourceFile, node: FunctionExpression | ClassExpression | ArrowFunction, name: string): void;
+        insertExportModifier(sourceFile: SourceFile, node: DeclarationStatement | VariableStatement): void;
+        /**
+         * This function should be used to insert nodes in lists when nodes don't carry separators as the part of the node range,
+         * i.e. arguments in arguments lists, parameters in parameter lists etc.
+         * Note that separators are part of the node in statements and class elements.
+         */
+        insertNodeInListAfter(sourceFile: SourceFile, after: Node, newNode: Node, containingList?: NodeArray<Node> | undefined): this;
+        private finishClassesWithNodesInsertedAtStart;
+        private finishTrailingCommaAfterDeletingNodesInList;
+        /**
+         * Note: after calling this, the TextChanges object must be discarded!
+         * @param validate only for tests
+         *    The reason we must validate as part of this method is that `getNonFormattedText` changes the node's positions,
+         *    so we can only call this once and can't get the non-formatted text separately.
+         */
+        getChanges(validate?: ValidateNonFormattedText): FileTextChanges[];
+        createNewFile(oldFile: SourceFile, fileName: string, statements: ReadonlyArray<Statement>): void;
+    }
+    type ValidateNonFormattedText = (node: Node, text: string) => void;
+    function applyChanges(text: string, changes: TextChange[]): string;
+    function isValidLocationToAddComment(sourceFile: SourceFile, position: number): boolean;
+}
+declare namespace ts {
+    interface CodeFixRegistration {
+        errorCodes: number[];
+        getCodeActions(context: CodeFixContext): CodeFixAction[] | undefined;
+        fixIds?: string[];
+        getAllCodeActions?(context: CodeFixAllContext): CombinedCodeActions;
+    }
+    interface CodeFixContextBase extends textChanges.TextChangesContext {
+        sourceFile: SourceFile;
+        program: Program;
+        cancellationToken: CancellationToken;
+        preferences: UserPreferences;
+    }
+    interface CodeFixAllContext extends CodeFixContextBase {
+        fixId: {};
+    }
+    interface CodeFixContext extends CodeFixContextBase {
+        errorCode: number;
+        span: TextSpan;
+    }
+    namespace codefix {
+        type DiagnosticAndArguments = DiagnosticMessage | [DiagnosticMessage, string] | [DiagnosticMessage, string, string];
+        function createCodeFixActionNoFixId(fixName: string, changes: FileTextChanges[], description: DiagnosticAndArguments): CodeFixAction;
+        function createCodeFixAction(fixName: string, changes: FileTextChanges[], description: DiagnosticAndArguments, fixId: {}, fixAllDescription: DiagnosticAndArguments, command?: CodeActionCommand): CodeFixAction;
+        function registerCodeFix(reg: CodeFixRegistration): void;
+        function getSupportedErrorCodes(): string[];
+        function getFixes(context: CodeFixContext): CodeFixAction[];
+        function getAllFixes(context: CodeFixAllContext): CombinedCodeActions;
+        function createFileTextChanges(fileName: string, textChanges: TextChange[]): FileTextChanges;
+        function codeFixAll(context: CodeFixAllContext, errorCodes: number[], use: (changes: textChanges.ChangeTracker, error: DiagnosticWithLocation, commands: Push<CodeActionCommand>) => void): CombinedCodeActions;
+    }
+}
+declare namespace ts {
+    interface Refactor {
+        /** Compute the associated code actions */
+        getEditsForAction(context: RefactorContext, actionName: string): RefactorEditInfo | undefined;
+        /** Compute (quickly) which actions are available here */
+        getAvailableActions(context: RefactorContext): ApplicableRefactorInfo[] | undefined;
+    }
+    interface RefactorContext extends textChanges.TextChangesContext {
+        file: SourceFile;
+        startPosition: number;
+        endPosition?: number;
+        program: Program;
+        cancellationToken?: CancellationToken;
+        preferences: UserPreferences;
+    }
+    namespace refactor {
+        /** @param name An unique code associated with each refactor. Does not have to be human-readable. */
+        function registerRefactor(name: string, refactor: Refactor): void;
+        function getApplicableRefactors(context: RefactorContext): ApplicableRefactorInfo[];
+        function getEditsForRefactor(context: RefactorContext, refactorName: string, actionName: string): RefactorEditInfo | undefined;
+    }
+    function getRefactorContextSpan({ startPosition, endPosition }: RefactorContext): TextSpan;
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+    type DeclarationWithType = FunctionLikeDeclaration | VariableDeclaration | PropertySignature | PropertyDeclaration;
+    function parameterShouldGetTypeFromJSDoc(node: Node): node is DeclarationWithType;
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+    function getImportCompletionAction(exportedSymbol: Symbol, moduleSymbol: Symbol, sourceFile: SourceFile, symbolName: string, host: LanguageServiceHost, program: Program, checker: TypeChecker, compilerOptions: CompilerOptions, allSourceFiles: ReadonlyArray<SourceFile>, formatContext: formatting.FormatContext, getCanonicalFileName: GetCanonicalFileName, symbolToken: Node | undefined, preferences: UserPreferences): {
+        readonly moduleSpecifier: string;
+        readonly codeAction: CodeAction;
+    };
+    function forEachExternalModuleToImportFrom(checker: TypeChecker, from: SourceFile, allSourceFiles: ReadonlyArray<SourceFile>, cb: (module: Symbol) => void): void;
+    function moduleSymbolToValidIdentifier(moduleSymbol: Symbol, target: ScriptTarget): string;
+    function moduleSpecifierToValidIdentifier(moduleSpecifier: string, target: ScriptTarget): string;
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+    /**
+     * Finds members of the resolved type that are missing in the class pointed to by class decl
+     * and generates source code for the missing members.
+     * @param possiblyMissingSymbols The collection of symbols to filter and then get insertions for.
+     * @returns Empty string iff there are no member insertions.
+     */
+    function createMissingMemberNodes(classDeclaration: ClassLikeDeclaration, possiblyMissingSymbols: ReadonlyArray<Symbol>, checker: TypeChecker, preferences: UserPreferences, out: (node: ClassElement) => void): void;
+    function createMethodFromCallExpression({ typeArguments, arguments: args, parent: parent }: CallExpression, methodName: string, inJs: boolean, makeStatic: boolean, preferences: UserPreferences): MethodDeclaration;
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.refactor.generateGetAccessorAndSetAccessor {
+}
+declare namespace ts.refactor.extractSymbol {
+    /**
+     * Compute the associated code actions
+     * Exported for tests.
+     */
+    function getAvailableActions(context: RefactorContext): ApplicableRefactorInfo[] | undefined;
+    function getEditsForAction(context: RefactorContext, actionName: string): RefactorEditInfo | undefined;
+    namespace Messages {
+        const cannotExtractRange: DiagnosticMessage;
+        const cannotExtractImport: DiagnosticMessage;
+        const cannotExtractSuper: DiagnosticMessage;
+        const cannotExtractEmpty: DiagnosticMessage;
+        const expressionExpected: DiagnosticMessage;
+        const uselessConstantType: DiagnosticMessage;
+        const statementOrExpressionExpected: DiagnosticMessage;
+        const cannotExtractRangeContainingConditionalBreakOrContinueStatements: DiagnosticMessage;
+        const cannotExtractRangeContainingConditionalReturnStatement: DiagnosticMessage;
+        const cannotExtractRangeContainingLabeledBreakOrContinueStatementWithTargetOutsideOfTheRange: DiagnosticMessage;
+        const cannotExtractRangeThatContainsWritesToReferencesLocatedOutsideOfTheTargetRangeInGenerators: DiagnosticMessage;
+        const typeWillNotBeVisibleInTheNewScope: DiagnosticMessage;
+        const functionWillNotBeVisibleInTheNewScope: DiagnosticMessage;
+        const cannotExtractIdentifier: DiagnosticMessage;
+        const cannotExtractExportedEntity: DiagnosticMessage;
+        const cannotWriteInExpression: DiagnosticMessage;
+        const cannotExtractReadonlyPropertyInitializerOutsideConstructor: DiagnosticMessage;
+        const cannotExtractAmbientBlock: DiagnosticMessage;
+        const cannotAccessVariablesFromNestedScopes: DiagnosticMessage;
+        const cannotExtractToOtherFunctionLike: DiagnosticMessage;
+        const cannotExtractToJSClass: DiagnosticMessage;
+        const cannotExtractToExpressionArrowFunction: DiagnosticMessage;
+    }
+    enum RangeFacts {
+        None = 0,
+        HasReturn = 1,
+        IsGenerator = 2,
+        IsAsyncFunction = 4,
+        UsesThis = 8,
+        /**
+         * The range is in a function which needs the 'static' modifier in a class
+         */
+        InStaticRegion = 16
+    }
+    /**
+     * Represents an expression or a list of statements that should be extracted with some extra information
+     */
+    interface TargetRange {
+        readonly range: Expression | Statement[];
+        readonly facts: RangeFacts;
+        /**
+         * A list of symbols that are declared in the selected range which are visible in the containing lexical scope
+         * Used to ensure we don't turn something used outside the range free (or worse, resolve to a different entity).
+         */
+        readonly declarations: Symbol[];
+    }
+    /**
+     * Result of 'getRangeToExtract' operation: contains either a range or a list of errors
+     */
+    type RangeToExtract = {
+        readonly targetRange?: never;
+        readonly errors: ReadonlyArray<Diagnostic>;
+    } | {
+        readonly targetRange: TargetRange;
+        readonly errors?: never;
+    };
+    /**
+     * getRangeToExtract takes a span inside a text file and returns either an expression or an array
+     * of statements representing the minimum set of nodes needed to extract the entire span. This
+     * process may fail, in which case a set of errors is returned instead (these are currently
+     * not shown to the user, but can be used by us diagnostically)
+     */
+    function getRangeToExtract(sourceFile: SourceFile, span: TextSpan): RangeToExtract;
+}
+declare namespace ts.refactor.generateGetAccessorAndSetAccessor {
+}
+declare namespace ts.refactor {
+}
+declare namespace ts.sourcemaps {
+    interface SourceMapData {
+        version?: number;
+        file?: string;
+        sourceRoot?: string;
+        sources: string[];
+        sourcesContent?: string[];
+        names?: string[];
+        mappings: string;
+    }
+    interface SourceMappableLocation {
+        fileName: string;
+        position: number;
+    }
+    interface SourceMapper {
+        getOriginalPosition(input: SourceMappableLocation): SourceMappableLocation;
+        getGeneratedPosition(input: SourceMappableLocation): SourceMappableLocation;
+    }
+    const identitySourceMapper: {
+        getOriginalPosition: typeof identity;
+        getGeneratedPosition: typeof identity;
+    };
+    interface SourceMapDecodeHost {
+        readFile(path: string): string | undefined;
+        fileExists(path: string): boolean;
+        getCanonicalFileName(path: string): string;
+        log(text: string): void;
+    }
+    function decode(host: SourceMapDecodeHost, mapPath: string, map: SourceMapData, program?: Program, fallbackCache?: SourceFileLikeCache): SourceMapper;
+}
+declare namespace ts {
+    /** The version of the language service API */
+    const servicesVersion = "0.8";
+    interface DisplayPartsSymbolWriter extends EmitTextWriter {
+        displayParts(): SymbolDisplayPart[];
+    }
+    function toEditorSettings(options: FormatCodeOptions | FormatCodeSettings): FormatCodeSettings;
+    function toEditorSettings(options: EditorOptions | EditorSettings): EditorSettings;
+    function displayPartsToString(displayParts: SymbolDisplayPart[] | undefined): string;
+    function getDefaultCompilerOptions(): CompilerOptions;
+    function getSupportedCodeFixes(): string[];
+    function createLanguageServiceSourceFile(fileName: string, scriptSnapshot: IScriptSnapshot, scriptTarget: ScriptTarget, version: string, setNodeParents: boolean, scriptKind?: ScriptKind): SourceFile;
+    let disableIncrementalParsing: boolean;
+    function updateLanguageServiceSourceFile(sourceFile: SourceFile, scriptSnapshot: IScriptSnapshot, version: string, textChangeRange: TextChangeRange | undefined, aggressiveChecks?: boolean): SourceFile;
+    /** A cancellation that throttles calls to the host */
+    class ThrottledCancellationToken implements CancellationToken {
+        private hostCancellationToken;
+        private readonly throttleWaitMilliseconds;
+        private lastCancellationCheckTime;
+        constructor(hostCancellationToken: HostCancellationToken, throttleWaitMilliseconds?: number);
+        isCancellationRequested(): boolean;
+        throwIfCancellationRequested(): void;
+    }
+    interface SourceFileLikeCache {
+        get(path: Path): SourceFileLike | undefined;
+    }
+    function createSourceFileLikeCache(host: {
+        readFile?: (path: string) => string | undefined;
+        fileExists?: (path: string) => boolean;
+    }): SourceFileLikeCache;
+    function createLanguageService(host: LanguageServiceHost, documentRegistry?: DocumentRegistry, syntaxOnly?: boolean): LanguageService;
+    /** Names in the name table are escaped, so an identifier `__foo` will have a name table entry `___foo`. */
+    function getNameTable(sourceFile: SourceFile): UnderscoreEscapedMap<number>;
+    /**
+     * Returns the containing object literal property declaration given a possible name node, e.g. "a" in x = { "a": 1 }
+     */
+    function getContainingObjectLiteralElement(node: Node): ObjectLiteralElement | undefined;
+    function getPropertySymbolsFromContextualType(typeChecker: TypeChecker, node: ObjectLiteralElement): Symbol[];
+    function getPropertySymbolsFromType(type: Type, propName: PropertyName): Symbol[] | undefined;
+    /**
+     * Get the path of the default library files (lib.d.ts) as distributed with the typescript
+     * node package.
+     * The functionality is not supported if the ts module is consumed outside of a node module.
+     */
+    function getDefaultLibFilePath(options: CompilerOptions): string;
+}
+declare namespace ts.BreakpointResolver {
+    /**
+     * Get the breakpoint span in given sourceFile
+     */
+    function spanInSourceFileAtLocation(sourceFile: SourceFile, position: number): TextSpan | undefined;
+}
+declare namespace ts {
+    /**
+     * Transform one or more nodes using the supplied transformers.
+     * @param source A single `Node` or an array of `Node` objects.
+     * @param transformers An array of `TransformerFactory` callbacks used to process the transformation.
+     * @param compilerOptions Optional compiler options.
+     */
+    function transform<T extends Node>(source: T | T[], transformers: TransformerFactory<T>[], compilerOptions?: CompilerOptions): TransformationResult<T>;
+}
+declare let debugObjectHost: {
+    CollectGarbage(): void;
+};
+declare namespace ts {
+    interface ScriptSnapshotShim {
+        /** Gets a portion of the script snapshot specified by [start, end). */
+        getText(start: number, end: number): string;
+        /** Gets the length of this script snapshot. */
+        getLength(): number;
+        /**
+         * Returns a JSON-encoded value of the type:
+         *   { span: { start: number; length: number }; newLength: number }
+         *
+         * Or undefined value if there was no change.
+         */
+        getChangeRange(oldSnapshot: ScriptSnapshotShim): string | undefined;
+        /** Releases all resources held by this script snapshot */
+        dispose?(): void;
+    }
+    interface Logger {
+        log(s: string): void;
+        trace(s: string): void;
+        error(s: string): void;
+    }
+    /** Public interface of the host of a language service shim instance. */
+    interface LanguageServiceShimHost extends Logger {
+        getCompilationSettings(): string;
+        /** Returns a JSON-encoded value of the type: string[] */
+        getScriptFileNames(): string;
+        getScriptKind?(fileName: string): ScriptKind;
+        getScriptVersion(fileName: string): string;
+        getScriptSnapshot(fileName: string): ScriptSnapshotShim;
+        getLocalizedDiagnosticMessages(): string;
+        getCancellationToken(): HostCancellationToken;
+        getCurrentDirectory(): string;
+        getDirectories(path: string): string;
+        getDefaultLibFileName(options: string): string;
+        getNewLine?(): string;
+        getProjectVersion?(): string;
+        useCaseSensitiveFileNames?(): boolean;
+        getTypeRootsVersion?(): number;
+        readDirectory(rootDir: string, extension: string, basePaths?: string, excludeEx?: string, includeFileEx?: string, includeDirEx?: string, depth?: number): string;
+        readFile(path: string, encoding?: string): string | undefined;
+        fileExists(path: string): boolean;
+        getModuleResolutionsForFile?(fileName: string): string;
+        getTypeReferenceDirectiveResolutionsForFile?(fileName: string): string;
+        directoryExists(directoryName: string): boolean;
+    }
+    /** Public interface of the core-services host instance used in managed side */
+    interface CoreServicesShimHost extends Logger {
+        directoryExists(directoryName: string): boolean;
+        fileExists(fileName: string): boolean;
+        getCurrentDirectory(): string;
+        getDirectories(path: string): string;
+        /**
+         * Returns a JSON-encoded value of the type: string[]
+         *
+         * @param exclude A JSON encoded string[] containing the paths to exclude
+         *  when enumerating the directory.
+         */
+        readDirectory(rootDir: string, extension: string, basePaths?: string, excludeEx?: string, includeFileEx?: string, includeDirEx?: string, depth?: number): string;
+        /**
+         * Read arbitary text files on disk, i.e. when resolution procedure needs the content of 'package.json' to determine location of bundled typings for node modules
+         */
+        readFile(fileName: string): string | undefined;
+        realpath?(path: string): string;
+        trace(s: string): void;
+        useCaseSensitiveFileNames?(): boolean;
+    }
+    interface ShimsFileReference {
+        path: string;
+        position: number;
+        length: number;
+    }
+    /** Public interface of a language service instance shim. */
+    interface ShimFactory {
+        registerShim(shim: Shim): void;
+        unregisterShim(shim: Shim): void;
+    }
+    interface Shim {
+        dispose(_dummy: {}): void;
+    }
+    interface LanguageServiceShim extends Shim {
+        languageService: LanguageService;
+        dispose(_dummy: {}): void;
+        refresh(throwOnError: boolean): void;
+        cleanupSemanticCache(): void;
+        getSyntacticDiagnostics(fileName: string): string;
+        getSemanticDiagnostics(fileName: string): string;
+        getSuggestionDiagnostics(fileName: string): string;
+        getCompilerOptionsDiagnostics(): string;
+        getSyntacticClassifications(fileName: string, start: number, length: number): string;
+        getSemanticClassifications(fileName: string, start: number, length: number): string;
+        getEncodedSyntacticClassifications(fileName: string, start: number, length: number): string;
+        getEncodedSemanticClassifications(fileName: string, start: number, length: number): string;
+        getCompletionsAtPosition(fileName: string, position: number, preferences: UserPreferences | undefined): string;
+        getCompletionEntryDetails(fileName: string, position: number, entryName: string, formatOptions: string | undefined, source: string | undefined, preferences: UserPreferences | undefined): string;
+        getQuickInfoAtPosition(fileName: string, position: number): string;
+        getNameOrDottedNameSpan(fileName: string, startPos: number, endPos: number): string;
+        getBreakpointStatementAtPosition(fileName: string, position: number): string;
+        getSignatureHelpItems(fileName: string, position: number): string;
+        /**
+         * Returns a JSON-encoded value of the type:
+         * { canRename: boolean, localizedErrorMessage: string, displayName: string, fullDisplayName: string, kind: string, kindModifiers: string, triggerSpan: { start; length } }
+         */
+        getRenameInfo(fileName: string, position: number): string;
+        /**
+         * Returns a JSON-encoded value of the type:
+         * { fileName: string, textSpan: { start: number, length: number } }[]
+         */
+        findRenameLocations(fileName: string, position: number, findInStrings: boolean, findInComments: boolean): string;
+        /**
+         * Returns a JSON-encoded value of the type:
+         * { fileName: string; textSpan: { start: number; length: number}; kind: string; name: string; containerKind: string; containerName: string }
+         *
+         * Or undefined value if no definition can be found.
+         */
+        getDefinitionAtPosition(fileName: string, position: number): string;
+        getDefinitionAndBoundSpan(fileName: string, position: number): string;
+        /**
+         * Returns a JSON-encoded value of the type:
+         * { fileName: string; textSpan: { start: number; length: number}; kind: string; name: string; containerKind: string; containerName: string }
+         *
+         * Or undefined value if no definition can be found.
+         */
+        getTypeDefinitionAtPosition(fileName: string, position: number): string;
+        /**
+         * Returns a JSON-encoded value of the type:
+         * { fileName: string; textSpan: { start: number; length: number}; }[]
+         */
+        getImplementationAtPosition(fileName: string, position: number): string;
+        /**
+         * Returns a JSON-encoded value of the type:
+         * { fileName: string; textSpan: { start: number; length: number}; isWriteAccess: boolean, isDefinition?: boolean }[]
+         */
+        getReferencesAtPosition(fileName: string, position: number): string;
+        /**
+         * Returns a JSON-encoded value of the type:
+         * { definition: <encoded>; references: <encoded>[] }[]
+         */
+        findReferences(fileName: string, position: number): string;
+        /**
+         * @deprecated
+         * Returns a JSON-encoded value of the type:
+         * { fileName: string; textSpan: { start: number; length: number}; isWriteAccess: boolean }[]
+         */
+        getOccurrencesAtPosition(fileName: string, position: number): string;
+        /**
+         * Returns a JSON-encoded value of the type:
+         * { fileName: string; highlights: { start: number; length: number, isDefinition: boolean }[] }[]
+         *
+         * @param fileToSearch A JSON encoded string[] containing the file names that should be
+         *  considered when searching.
+         */
+        getDocumentHighlights(fileName: string, position: number, filesToSearch: string): string;
+        /**
+         * Returns a JSON-encoded value of the type:
+         * { name: string; kind: string; kindModifiers: string; containerName: string; containerKind: string; matchKind: string; fileName: string; textSpan: { start: number; length: number}; } [] = [];
+         */
+        getNavigateToItems(searchValue: string, maxResultCount?: number, fileName?: string): string;
+        /**
+         * Returns a JSON-encoded value of the type:
+         * { text: string; kind: string; kindModifiers: string; bolded: boolean; grayed: boolean; indent: number; spans: { start: number; length: number; }[]; childItems: <recursive use of this type>[] } [] = [];
+         */
+        getNavigationBarItems(fileName: string): string;
+        /** Returns a JSON-encoded value of the type ts.NavigationTree. */
+        getNavigationTree(fileName: string): string;
+        /**
+         * Returns a JSON-encoded value of the type:
+         * { textSpan: { start: number, length: number }; hintSpan: { start: number, length: number }; bannerText: string; autoCollapse: boolean } [] = [];
+         */
+        getOutliningSpans(fileName: string): string;
+        getTodoComments(fileName: string, todoCommentDescriptors: string): string;
+        getBraceMatchingAtPosition(fileName: string, position: number): string;
+        getIndentationAtPosition(fileName: string, position: number, options: string): string;
+        getFormattingEditsForRange(fileName: string, start: number, end: number, options: string): string;
+        getFormattingEditsForDocument(fileName: string, options: string): string;
+        getFormattingEditsAfterKeystroke(fileName: string, position: number, key: string, options: string): string;
+        /**
+         * Returns JSON-encoded value of the type TextInsertion.
+         */
+        getDocCommentTemplateAtPosition(fileName: string, position: number): string;
+        /**
+         * Returns JSON-encoded boolean to indicate whether we should support brace location
+         * at the current position.
+         * E.g. we don't want brace completion inside string-literals, comments, etc.
+         */
+        isValidBraceCompletionAtPosition(fileName: string, position: number, openingBrace: number): string;
+        /**
+         * Returns a JSON-encoded TextSpan | undefined indicating the range of the enclosing comment, if it exists.
+         */
+        getSpanOfEnclosingComment(fileName: string, position: number, onlyMultiLine: boolean): string;
+        getEmitOutput(fileName: string): string;
+        getEmitOutputObject(fileName: string): EmitOutput;
+    }
+    interface ClassifierShim extends Shim {
+        getEncodedLexicalClassifications(text: string, lexState: EndOfLineState, syntacticClassifierAbsent?: boolean): string;
+        getClassificationsForLine(text: string, lexState: EndOfLineState, syntacticClassifierAbsent?: boolean): string;
+    }
+    interface CoreServicesShim extends Shim {
+        getAutomaticTypeDirectiveNames(compilerOptionsJson: string): string;
+        getPreProcessedFileInfo(fileName: string, sourceText: IScriptSnapshot): string;
+        getTSConfigFileInfo(fileName: string, sourceText: IScriptSnapshot): string;
+        getDefaultCompilationSettings(): string;
+        discoverTypings(discoverTypingsJson: string): string;
+    }
+    class LanguageServiceShimHostAdapter implements LanguageServiceHost {
+        private shimHost;
+        private files;
+        private loggingEnabled;
+        private tracingEnabled;
+        resolveModuleNames: (moduleName: string[], containingFile: string) => ResolvedModuleFull[];
+        resolveTypeReferenceDirectives: (typeDirectiveNames: string[], containingFile: string) => ResolvedTypeReferenceDirective[];
+        directoryExists: (directoryName: string) => boolean;
+        constructor(shimHost: LanguageServiceShimHost);
+        log(s: string): void;
+        trace(s: string): void;
+        error(s: string): void;
+        getProjectVersion(): string;
+        getTypeRootsVersion(): number;
+        useCaseSensitiveFileNames(): boolean;
+        getCompilationSettings(): CompilerOptions;
+        getScriptFileNames(): string[];
+        getScriptSnapshot(fileName: string): IScriptSnapshot | undefined;
+        getScriptKind(fileName: string): ScriptKind;
+        getScriptVersion(fileName: string): string;
+        getLocalizedDiagnosticMessages(): any;
+        getCancellationToken(): HostCancellationToken;
+        getCurrentDirectory(): string;
+        getDirectories(path: string): string[];
+        getDefaultLibFileName(options: CompilerOptions): string;
+        readDirectory(path: string, extensions?: ReadonlyArray<string>, exclude?: string[], include?: string[], depth?: number): string[];
+        readFile(path: string, encoding?: string): string | undefined;
+        fileExists(path: string): boolean;
+    }
+    class CoreServicesShimHostAdapter implements ParseConfigHost, ModuleResolutionHost, JsTyping.TypingResolutionHost {
+        private shimHost;
+        directoryExists: (directoryName: string) => boolean;
+        realpath: (path: string) => string;
+        useCaseSensitiveFileNames: boolean;
+        constructor(shimHost: CoreServicesShimHost);
+        readDirectory(rootDir: string, extensions: ReadonlyArray<string>, exclude: ReadonlyArray<string>, include: ReadonlyArray<string>, depth?: number): string[];
+        fileExists(fileName: string): boolean;
+        readFile(fileName: string): string | undefined;
+        getDirectories(path: string): string[];
+    }
+    interface RealizedDiagnostic {
+        message: string;
+        start: number;
+        length: number;
+        category: string;
+        code: number;
+        reportsUnnecessary?: {};
+    }
+    function realizeDiagnostics(diagnostics: ReadonlyArray<Diagnostic>, newLine: string): RealizedDiagnostic[];
+    class TypeScriptServicesFactory implements ShimFactory {
+        private _shims;
+        private documentRegistry;
+        getServicesVersion(): string;
+        createLanguageServiceShim(host: LanguageServiceShimHost): LanguageServiceShim;
+        createClassifierShim(logger: Logger): ClassifierShim;
+        createCoreServicesShim(host: CoreServicesShimHost): CoreServicesShim;
+        close(): void;
+        registerShim(shim: Shim): void;
+        unregisterShim(shim: Shim): void;
+    }
+}
+declare namespace TypeScript.Services {
+    const TypeScriptServicesFactory: typeof ts.TypeScriptServicesFactory;
+}
+declare const toolsVersion = "3.0";
+//# sourceMappingURL=services.d.ts.map
+//# sourceMappingURL=typescriptServices.d.ts.map
 export = ts;
\ No newline at end of file

From b72825dedf5b89129de09d470a1737ad24d84799 Mon Sep 17 00:00:00 2001
From: Ryan Cavanaugh <RyanCavanaugh@users.noreply.github.com>
Date: Mon, 11 Jun 2018 10:16:10 -0700
Subject: [PATCH 29/37] Debugging linux failure

---
 Jakefile.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Jakefile.js b/Jakefile.js
index d21b975e20f..2ff807534de 100644
--- a/Jakefile.js
+++ b/Jakefile.js
@@ -233,7 +233,8 @@ function compileOutputConfigFile(configFile, prereqs, prefixes, callback) {
 
 function compileConfigFile(outFile, prereqs, configFile, prefixes, useBuiltCompiler = false, callback) {
     const allPrereqs = filesFromConfig(configFile).concat(prereqs || []).concat(configFile);
-    outFile = outFile.replace(/\//g, "\\");
+    outFile = outFile.replace(/\//g, path.sep);
+    console.log(`Task ${outFile} genned from ${configFile}`);
     file(outFile, allPrereqs, function () {
         const startCompileTime = mark();
         const compilerPath = useBuiltCompiler ? builtLocalCompiler : LKGCompiler;

From c62d20a685fd2483201310949ef19a0624318ce6 Mon Sep 17 00:00:00 2001
From: Ryan Cavanaugh <RyanCavanaugh@users.noreply.github.com>
Date: Mon, 11 Jun 2018 11:01:29 -0700
Subject: [PATCH 30/37] Undo debug

---
 Jakefile.js | 1 -
 1 file changed, 1 deletion(-)

diff --git a/Jakefile.js b/Jakefile.js
index 2ff807534de..b7382d69a4a 100644
--- a/Jakefile.js
+++ b/Jakefile.js
@@ -234,7 +234,6 @@ function compileOutputConfigFile(configFile, prereqs, prefixes, callback) {
 function compileConfigFile(outFile, prereqs, configFile, prefixes, useBuiltCompiler = false, callback) {
     const allPrereqs = filesFromConfig(configFile).concat(prereqs || []).concat(configFile);
     outFile = outFile.replace(/\//g, path.sep);
-    console.log(`Task ${outFile} genned from ${configFile}`);
     file(outFile, allPrereqs, function () {
         const startCompileTime = mark();
         const compilerPath = useBuiltCompiler ? builtLocalCompiler : LKGCompiler;

From a966c4110804cd7cf3584328d0a781a23cbf7e1c Mon Sep 17 00:00:00 2001
From: Ryan Cavanaugh <RyanCavanaugh@users.noreply.github.com>
Date: Mon, 11 Jun 2018 11:32:27 -0700
Subject: [PATCH 31/37] Fix for linux

---
 Jakefile.js | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Jakefile.js b/Jakefile.js
index b7382d69a4a..0c4957505ad 100644
--- a/Jakefile.js
+++ b/Jakefile.js
@@ -159,6 +159,8 @@ compileOutputConfigFile('src/tsserverLibrary/tsconfig.json', [], [], function ()
         "\nexport = ts;" +
         "\nexport as namespace ts;";
     tsserverLibraryDefinitionFileContents = removeConstModifierFromEnumDeclarations(tsserverLibraryDefinitionFileContents);
+    // Normalize line endings
+    tsserverLibraryDefinitionFileContents = tsserverLibraryDefinitionFile.replace(/\r\n/g, "\n");
 
     fs.writeFileSync(tsserverLibraryDefinitionFile, tsserverLibraryDefinitionFileContents);
 });

From 1e34f920cfdb80c0c88463676c4cdf08a3ca3b91 Mon Sep 17 00:00:00 2001
From: Ryan Cavanaugh <RyanCavanaugh@users.noreply.github.com>
Date: Mon, 11 Jun 2018 12:26:47 -0700
Subject: [PATCH 32/37] Fix regexp operand

---
 Jakefile.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Jakefile.js b/Jakefile.js
index 0c4957505ad..4b60dabca34 100644
--- a/Jakefile.js
+++ b/Jakefile.js
@@ -160,7 +160,7 @@ compileOutputConfigFile('src/tsserverLibrary/tsconfig.json', [], [], function ()
         "\nexport as namespace ts;";
     tsserverLibraryDefinitionFileContents = removeConstModifierFromEnumDeclarations(tsserverLibraryDefinitionFileContents);
     // Normalize line endings
-    tsserverLibraryDefinitionFileContents = tsserverLibraryDefinitionFile.replace(/\r\n/g, "\n");
+    tsserverLibraryDefinitionFileContents = tsserverLibraryDefinitionFileContents.replace(/\r\n/g, "\n");
 
     fs.writeFileSync(tsserverLibraryDefinitionFile, tsserverLibraryDefinitionFileContents);
 });

From 7d8bc2518cabee92d680691eb61f93a50a15a168 Mon Sep 17 00:00:00 2001
From: Ryan Cavanaugh <RyanCavanaugh@users.noreply.github.com>
Date: Mon, 11 Jun 2018 13:03:25 -0700
Subject: [PATCH 33/37] Update API

---
 .../reference/api/tsserverlibrary.d.ts        | 28216 ++++++++--------
 1 file changed, 14108 insertions(+), 14108 deletions(-)

diff --git a/tests/baselines/reference/api/tsserverlibrary.d.ts b/tests/baselines/reference/api/tsserverlibrary.d.ts
index f3b22d14bc0..fdf8974ec43 100644
--- a/tests/baselines/reference/api/tsserverlibrary.d.ts
+++ b/tests/baselines/reference/api/tsserverlibrary.d.ts
@@ -13,14114 +13,14114 @@ See the Apache Version 2.0 License for specific language governing permissions
 and limitations under the License.
 ***************************************************************************** */
 
-declare namespace ts {
-    /** Gets a timestamp with (at least) ms resolution */
-    const timestamp: () => number;
-}
-/** Performance measurements for the compiler. */
-declare namespace ts.performance {
-    /**
-     * Marks a performance event.
-     *
-     * @param markName The name of the mark.
-     */
-    function mark(markName: string): void;
-    /**
-     * Adds a performance measurement with the specified name.
-     *
-     * @param measureName The name of the performance measurement.
-     * @param startMarkName The name of the starting mark. If not supplied, the point at which the
-     *      profiler was enabled is used.
-     * @param endMarkName The name of the ending mark. If not supplied, the current timestamp is
-     *      used.
-     */
-    function measure(measureName: string, startMarkName?: string, endMarkName?: string): void;
-    /**
-     * Gets the number of times a marker was encountered.
-     *
-     * @param markName The name of the mark.
-     */
-    function getCount(markName: string): number;
-    /**
-     * Gets the total duration of all measurements with the supplied name.
-     *
-     * @param measureName The name of the measure whose durations should be accumulated.
-     */
-    function getDuration(measureName: string): number;
-    /**
-     * Iterate over each measure, performing some action
-     *
-     * @param cb The action to perform for each measure
-     */
-    function forEachMeasure(cb: (measureName: string, duration: number) => void): void;
-    /** Enables (and resets) performance measurements for the compiler. */
-    function enable(): void;
-    /** Disables performance measurements for the compiler. */
-    function disable(): void;
-}
-declare namespace ts {
-    const versionMajorMinor = "3.0";
-    /** The version of the TypeScript compiler release */
-    const version: string;
-}
-declare namespace ts {
-    /**
-     * Type of objects whose values are all of the same type.
-     * The `in` and `for-in` operators can *not* be safely used,
-     * since `Object.prototype` may be modified by outside code.
-     */
-    interface MapLike<T> {
-        [index: string]: T;
-    }
-    interface SortedArray<T> extends Array<T> {
-        " __sortedArrayBrand": any;
-    }
-}
-declare namespace ts {
-    type EqualityComparer<T> = (a: T, b: T) => boolean;
-    type Comparer<T> = (a: T, b: T) => Comparison;
-    enum Comparison {
-        LessThan = -1,
-        EqualTo = 0,
-        GreaterThan = 1
-    }
-    /** ES6 Map interface, only read methods included. */
-    interface ReadonlyMap<T> {
-        get(key: string): T | undefined;
-        has(key: string): boolean;
-        forEach(action: (value: T, key: string) => void): void;
-        readonly size: number;
-        keys(): Iterator<string>;
-        values(): Iterator<T>;
-        entries(): Iterator<[string, T]>;
-    }
-    /** ES6 Map interface. */
-    interface Map<T> extends ReadonlyMap<T> {
-        set(key: string, value: T): this;
-        delete(key: string): boolean;
-        clear(): void;
-    }
-    /** ES6 Iterator type. */
-    interface Iterator<T> {
-        next(): {
-            value: T;
-            done: false;
-        } | {
-            value: never;
-            done: true;
-        };
-    }
-    /** Array that is only intended to be pushed to, never read. */
-    interface Push<T> {
-        push(...values: T[]): void;
-    }
-    /** Create a new map. If a template object is provided, the map will copy entries from it. */
-    function createMap<T>(): Map<T>;
-    function createMapFromEntries<T>(entries: [string, T][]): Map<T>;
-    function createMapFromTemplate<T>(template: MapLike<T>): Map<T>;
-    const MapCtr: new <T>() => Map<T>;
-    function length(array: ReadonlyArray<any> | undefined): number;
-    /**
-     * Iterates through 'array' by index and performs the callback on each element of array until the callback
-     * returns a truthy value, then returns that value.
-     * If no such value is found, the callback is applied to each element of array and undefined is returned.
-     */
-    function forEach<T, U>(array: ReadonlyArray<T> | undefined, callback: (element: T, index: number) => U | undefined): U | undefined;
-    /** Like `forEach`, but suitable for use with numbers and strings (which may be falsy). */
-    function firstDefined<T, U>(array: ReadonlyArray<T> | undefined, callback: (element: T, index: number) => U | undefined): U | undefined;
-    function firstDefinedIterator<T, U>(iter: Iterator<T>, callback: (element: T) => U | undefined): U | undefined;
-    function zipWith<T, U, V>(arrayA: ReadonlyArray<T>, arrayB: ReadonlyArray<U>, callback: (a: T, b: U, index: number) => V): V[];
-    function zipToIterator<T, U>(arrayA: ReadonlyArray<T>, arrayB: ReadonlyArray<U>): Iterator<[T, U]>;
-    function zipToMap<T>(keys: ReadonlyArray<string>, values: ReadonlyArray<T>): Map<T>;
-    /**
-     * Iterates through `array` by index and performs the callback on each element of array until the callback
-     * returns a falsey value, then returns false.
-     * If no such value is found, the callback is applied to each element of array and `true` is returned.
-     */
-    function every<T>(array: ReadonlyArray<T>, callback: (element: T, index: number) => boolean): boolean;
-    /** Works like Array.prototype.find, returning `undefined` if no element satisfying the predicate is found. */
-    function find<T, U extends T>(array: ReadonlyArray<T>, predicate: (element: T, index: number) => element is U): U | undefined;
-    function find<T>(array: ReadonlyArray<T>, predicate: (element: T, index: number) => boolean): T | undefined;
-    function findLast<T, U extends T>(array: ReadonlyArray<T>, predicate: (element: T, index: number) => element is U): U | undefined;
-    function findLast<T>(array: ReadonlyArray<T>, predicate: (element: T, index: number) => boolean): T | undefined;
-    /** Works like Array.prototype.findIndex, returning `-1` if no element satisfying the predicate is found. */
-    function findIndex<T>(array: ReadonlyArray<T>, predicate: (element: T, index: number) => boolean, startIndex?: number): number;
-    function findLastIndex<T>(array: ReadonlyArray<T>, predicate: (element: T, index: number) => boolean, startIndex?: number): number;
-    /**
-     * Returns the first truthy result of `callback`, or else fails.
-     * This is like `forEach`, but never returns undefined.
-     */
-    function findMap<T, U>(array: ReadonlyArray<T>, callback: (element: T, index: number) => U | undefined): U;
-    function contains<T>(array: ReadonlyArray<T> | undefined, value: T, equalityComparer?: EqualityComparer<T>): boolean;
-    function arraysEqual<T>(a: ReadonlyArray<T>, b: ReadonlyArray<T>, equalityComparer?: EqualityComparer<T>): boolean;
-    function indexOfAnyCharCode(text: string, charCodes: ReadonlyArray<number>, start?: number): number;
-    function countWhere<T>(array: ReadonlyArray<T>, predicate: (x: T, i: number) => boolean): number;
-    /**
-     * Filters an array by a predicate function. Returns the same array instance if the predicate is
-     * true for all elements, otherwise returns a new array instance containing the filtered subset.
-     */
-    function filter<T, U extends T>(array: T[], f: (x: T) => x is U): U[];
-    function filter<T>(array: T[], f: (x: T) => boolean): T[];
-    function filter<T, U extends T>(array: ReadonlyArray<T>, f: (x: T) => x is U): ReadonlyArray<U>;
-    function filter<T, U extends T>(array: ReadonlyArray<T>, f: (x: T) => boolean): ReadonlyArray<T>;
-    function filter<T, U extends T>(array: T[] | undefined, f: (x: T) => x is U): U[] | undefined;
-    function filter<T>(array: T[] | undefined, f: (x: T) => boolean): T[] | undefined;
-    function filter<T, U extends T>(array: ReadonlyArray<T> | undefined, f: (x: T) => x is U): ReadonlyArray<U> | undefined;
-    function filter<T, U extends T>(array: ReadonlyArray<T> | undefined, f: (x: T) => boolean): ReadonlyArray<T> | undefined;
-    function filterMutate<T>(array: T[], f: (x: T, i: number, array: T[]) => boolean): void;
-    function clear(array: {}[]): void;
-    function map<T, U>(array: ReadonlyArray<T>, f: (x: T, i: number) => U): U[];
-    function map<T, U>(array: ReadonlyArray<T> | undefined, f: (x: T, i: number) => U): U[] | undefined;
-    function mapIterator<T, U>(iter: Iterator<T>, mapFn: (x: T) => U): Iterator<U>;
-    function sameMap<T>(array: T[], f: (x: T, i: number) => T): T[];
-    function sameMap<T>(array: ReadonlyArray<T>, f: (x: T, i: number) => T): ReadonlyArray<T>;
-    function sameMap<T>(array: T[] | undefined, f: (x: T, i: number) => T): T[] | undefined;
-    function sameMap<T>(array: ReadonlyArray<T> | undefined, f: (x: T, i: number) => T): ReadonlyArray<T> | undefined;
-    /**
-     * Flattens an array containing a mix of array or non-array elements.
-     *
-     * @param array The array to flatten.
-     */
-    function flatten<T>(array: ReadonlyArray<T | ReadonlyArray<T> | undefined>): T[];
-    function flatten<T>(array: ReadonlyArray<T | ReadonlyArray<T> | undefined> | undefined): T[] | undefined;
-    /**
-     * Maps an array. If the mapped value is an array, it is spread into the result.
-     *
-     * @param array The array to map.
-     * @param mapfn The callback used to map the result into one or more values.
-     */
-    function flatMap<T, U>(array: ReadonlyArray<T>, mapfn: (x: T, i: number) => U | ReadonlyArray<U> | undefined): U[];
-    function flatMap<T, U>(array: ReadonlyArray<T> | undefined, mapfn: (x: T, i: number) => U | ReadonlyArray<U> | undefined): U[] | undefined;
-    function flatMapIterator<T, U>(iter: Iterator<T>, mapfn: (x: T) => U[] | Iterator<U> | undefined): Iterator<U>;
-    /**
-     * Maps an array. If the mapped value is an array, it is spread into the result.
-     * Avoids allocation if all elements map to themselves.
-     *
-     * @param array The array to map.
-     * @param mapfn The callback used to map the result into one or more values.
-     */
-    function sameFlatMap<T>(array: T[], mapfn: (x: T, i: number) => T | ReadonlyArray<T>): T[];
-    function sameFlatMap<T>(array: ReadonlyArray<T>, mapfn: (x: T, i: number) => T | ReadonlyArray<T>): ReadonlyArray<T>;
-    function mapAllOrFail<T, U>(array: ReadonlyArray<T>, mapFn: (x: T, i: number) => U | undefined): U[] | undefined;
-    function mapDefined<T, U>(array: ReadonlyArray<T> | undefined, mapFn: (x: T, i: number) => U | undefined): U[];
-    function mapDefinedIterator<T, U>(iter: Iterator<T>, mapFn: (x: T) => U | undefined): Iterator<U>;
-    const emptyIterator: Iterator<never>;
-    function singleIterator<T>(value: T): Iterator<T>;
-    /**
-     * Maps contiguous spans of values with the same key.
-     *
-     * @param array The array to map.
-     * @param keyfn A callback used to select the key for an element.
-     * @param mapfn A callback used to map a contiguous chunk of values to a single value.
-     */
-    function spanMap<T, K, U>(array: ReadonlyArray<T>, keyfn: (x: T, i: number) => K, mapfn: (chunk: T[], key: K, start: number, end: number) => U): U[];
-    function spanMap<T, K, U>(array: ReadonlyArray<T> | undefined, keyfn: (x: T, i: number) => K, mapfn: (chunk: T[], key: K, start: number, end: number) => U): U[] | undefined;
-    function mapEntries<T, U>(map: ReadonlyMap<T>, f: (key: string, value: T) => [string, U]): Map<U>;
-    function mapEntries<T, U>(map: ReadonlyMap<T> | undefined, f: (key: string, value: T) => [string, U]): Map<U> | undefined;
-    function some<T>(array: ReadonlyArray<T> | undefined): array is ReadonlyArray<T>;
-    function some<T>(array: ReadonlyArray<T> | undefined, predicate: (value: T) => boolean): boolean;
-    /** Calls the callback with (start, afterEnd) index pairs for each range where 'pred' is true. */
-    function getRangesWhere<T>(arr: ReadonlyArray<T>, pred: (t: T) => boolean, cb: (start: number, afterEnd: number) => void): void;
-    function concatenate<T>(array1: T[], array2: T[]): T[];
-    function concatenate<T>(array1: ReadonlyArray<T>, array2: ReadonlyArray<T>): ReadonlyArray<T>;
-    function concatenate<T>(array1: T[] | undefined, array2: T[] | undefined): T[];
-    function concatenate<T>(array1: ReadonlyArray<T> | undefined, array2: ReadonlyArray<T> | undefined): ReadonlyArray<T>;
-    /**
-     * Deduplicates an unsorted array.
-     * @param equalityComparer An optional `EqualityComparer` used to determine if two values are duplicates.
-     * @param comparer An optional `Comparer` used to sort entries before comparison, though the
-     * result will remain in the original order in `array`.
-     */
-    function deduplicate<T>(array: ReadonlyArray<T>, equalityComparer?: EqualityComparer<T>, comparer?: Comparer<T>): T[];
-    function deduplicate<T>(array: ReadonlyArray<T> | undefined, equalityComparer?: EqualityComparer<T>, comparer?: Comparer<T>): T[] | undefined;
-    function insertSorted<T>(array: SortedArray<T>, insert: T, compare: Comparer<T>): void;
-    function sortAndDeduplicate<T>(array: ReadonlyArray<T>, comparer: Comparer<T>, equalityComparer?: EqualityComparer<T>): T[];
-    function arrayIsEqualTo<T>(array1: ReadonlyArray<T> | undefined, array2: ReadonlyArray<T> | undefined, equalityComparer?: (a: T, b: T) => boolean): boolean;
-    /**
-     * Compacts an array, removing any falsey elements.
-     */
-    function compact<T>(array: T[]): T[];
-    function compact<T>(array: ReadonlyArray<T>): ReadonlyArray<T>;
-    /**
-     * Gets the relative complement of `arrayA` with respect to `arrayB`, returning the elements that
-     * are not present in `arrayA` but are present in `arrayB`. Assumes both arrays are sorted
-     * based on the provided comparer.
-     */
-    function relativeComplement<T>(arrayA: T[] | undefined, arrayB: T[] | undefined, comparer: Comparer<T>): T[] | undefined;
-    function sum<T extends Record<K, number>, K extends string>(array: ReadonlyArray<T>, prop: K): number;
-    /**
-     * Appends a value to an array, returning the array.
-     *
-     * @param to The array to which `value` is to be appended. If `to` is `undefined`, a new array
-     * is created if `value` was appended.
-     * @param value The value to append to the array. If `value` is `undefined`, nothing is
-     * appended.
-     */
-    function append<T>(to: T[], value: T | undefined): T[];
-    function append<T>(to: T[] | undefined, value: T): T[];
-    function append<T>(to: T[] | undefined, value: T | undefined): T[] | undefined;
-    function append<T>(to: Push<T>, value: T | undefined): void;
-    /**
-     * Appends a range of value to an array, returning the array.
-     *
-     * @param to The array to which `value` is to be appended. If `to` is `undefined`, a new array
-     * is created if `value` was appended.
-     * @param from The values to append to the array. If `from` is `undefined`, nothing is
-     * appended. If an element of `from` is `undefined`, that element is not appended.
-     * @param start The offset in `from` at which to start copying values.
-     * @param end The offset in `from` at which to stop copying values (non-inclusive).
-     */
-    function addRange<T>(to: T[], from: ReadonlyArray<T> | undefined, start?: number, end?: number): T[];
-    function addRange<T>(to: T[] | undefined, from: ReadonlyArray<T> | undefined, start?: number, end?: number): T[] | undefined;
-    /**
-     * @return Whether the value was added.
-     */
-    function pushIfUnique<T>(array: T[], toAdd: T, equalityComparer?: EqualityComparer<T>): boolean;
-    /**
-     * Unlike `pushIfUnique`, this can take `undefined` as an input, and returns a new array.
-     */
-    function appendIfUnique<T>(array: T[] | undefined, toAdd: T, equalityComparer?: EqualityComparer<T>): T[];
-    /**
-     * Returns a new sorted array.
-     */
-    function sort<T>(array: ReadonlyArray<T>, comparer: Comparer<T>): T[];
-    function best<T>(iter: Iterator<T>, isBetter: (a: T, b: T) => boolean): T | undefined;
-    function arrayIterator<T>(array: ReadonlyArray<T>): Iterator<T>;
-    /**
-     * Stable sort of an array. Elements equal to each other maintain their relative position in the array.
-     */
-    function stableSort<T>(array: ReadonlyArray<T>, comparer: Comparer<T>): T[];
-    function rangeEquals<T>(array1: ReadonlyArray<T>, array2: ReadonlyArray<T>, pos: number, end: number): boolean;
-    /**
-     * Returns the element at a specific offset in an array if non-empty, `undefined` otherwise.
-     * A negative offset indicates the element should be retrieved from the end of the array.
-     */
-    function elementAt<T>(array: ReadonlyArray<T> | undefined, offset: number): T | undefined;
-    /**
-     * Returns the first element of an array if non-empty, `undefined` otherwise.
-     */
-    function firstOrUndefined<T>(array: ReadonlyArray<T>): T | undefined;
-    function first<T>(array: ReadonlyArray<T>): T;
-    /**
-     * Returns the last element of an array if non-empty, `undefined` otherwise.
-     */
-    function lastOrUndefined<T>(array: ReadonlyArray<T>): T | undefined;
-    function last<T>(array: ReadonlyArray<T>): T;
-    /**
-     * Returns the only element of an array if it contains only one element, `undefined` otherwise.
-     */
-    function singleOrUndefined<T>(array: ReadonlyArray<T> | undefined): T | undefined;
-    /**
-     * Returns the only element of an array if it contains only one element; otheriwse, returns the
-     * array.
-     */
-    function singleOrMany<T>(array: T[]): T | T[];
-    function singleOrMany<T>(array: ReadonlyArray<T>): T | ReadonlyArray<T>;
-    function singleOrMany<T>(array: T[] | undefined): T | T[] | undefined;
-    function singleOrMany<T>(array: ReadonlyArray<T> | undefined): T | ReadonlyArray<T> | undefined;
-    function replaceElement<T>(array: ReadonlyArray<T>, index: number, value: T): T[];
-    /**
-     * Performs a binary search, finding the index at which `value` occurs in `array`.
-     * If no such index is found, returns the 2's-complement of first index at which
-     * `array[index]` exceeds `value`.
-     * @param array A sorted array whose first element must be no larger than number
-     * @param value The value to be searched for in the array.
-     * @param keySelector A callback used to select the search key from `value` and each element of
-     * `array`.
-     * @param keyComparer A callback used to compare two keys in a sorted array.
-     * @param offset An offset into `array` at which to start the search.
-     */
-    function binarySearch<T, U>(array: ReadonlyArray<T>, value: T, keySelector: (v: T) => U, keyComparer: Comparer<U>, offset?: number): number;
-    function reduceLeft<T, U>(array: ReadonlyArray<T> | undefined, f: (memo: U, value: T, i: number) => U, initial: U, start?: number, count?: number): U;
-    function reduceLeft<T>(array: ReadonlyArray<T>, f: (memo: T, value: T, i: number) => T): T | undefined;
-    /**
-     * Indicates whether a map-like contains an own property with the specified key.
-     *
-     * @param map A map-like.
-     * @param key A property key.
-     */
-    function hasProperty(map: MapLike<any>, key: string): boolean;
-    /**
-     * Gets the value of an owned property in a map-like.
-     *
-     * @param map A map-like.
-     * @param key A property key.
-     */
-    function getProperty<T>(map: MapLike<T>, key: string): T | undefined;
-    /**
-     * Gets the owned, enumerable property keys of a map-like.
-     */
-    function getOwnKeys<T>(map: MapLike<T>): string[];
-    function getOwnValues<T>(sparseArray: T[]): T[];
-    /** Shims `Array.from`. */
-    function arrayFrom<T, U>(iterator: Iterator<T>, map: (t: T) => U): U[];
-    function arrayFrom<T>(iterator: Iterator<T>): T[];
-    function assign<T extends object>(t: T, ...args: (T | undefined)[]): T;
-    /**
-     * Performs a shallow equality comparison of the contents of two map-likes.
-     *
-     * @param left A map-like whose properties should be compared.
-     * @param right A map-like whose properties should be compared.
-     */
-    function equalOwnProperties<T>(left: MapLike<T> | undefined, right: MapLike<T> | undefined, equalityComparer?: EqualityComparer<T>): boolean;
-    /**
-     * Creates a map from the elements of an array.
-     *
-     * @param array the array of input elements.
-     * @param makeKey a function that produces a key for a given element.
-     *
-     * This function makes no effort to avoid collisions; if any two elements produce
-     * the same key with the given 'makeKey' function, then the element with the higher
-     * index in the array will be the one associated with the produced key.
-     */
-    function arrayToMap<T>(array: ReadonlyArray<T>, makeKey: (value: T) => string | undefined): Map<T>;
-    function arrayToMap<T, U>(array: ReadonlyArray<T>, makeKey: (value: T) => string | undefined, makeValue: (value: T) => U): Map<U>;
-    function arrayToNumericMap<T>(array: ReadonlyArray<T>, makeKey: (value: T) => number): T[];
-    function arrayToNumericMap<T, U>(array: ReadonlyArray<T>, makeKey: (value: T) => number, makeValue: (value: T) => U): U[];
-    function arrayToMultiMap<T>(values: ReadonlyArray<T>, makeKey: (value: T) => string): MultiMap<T>;
-    function arrayToMultiMap<T, U>(values: ReadonlyArray<T>, makeKey: (value: T) => string, makeValue: (value: T) => U): MultiMap<U>;
-    function group<T>(values: ReadonlyArray<T>, getGroupId: (value: T) => string): ReadonlyArray<ReadonlyArray<T>>;
-    function clone<T>(object: T): T;
-    function extend<T1, T2>(first: T1, second: T2): T1 & T2;
-    interface MultiMap<T> extends Map<T[]> {
-        /**
-         * Adds the value to an array of values associated with the key, and returns the array.
-         * Creates the array if it does not already exist.
-         */
-        add(key: string, value: T): T[];
-        /**
-         * Removes a value from an array of values associated with the key.
-         * Does not preserve the order of those values.
-         * Does nothing if `key` is not in `map`, or `value` is not in `map[key]`.
-         */
-        remove(key: string, value: T): void;
-    }
-    function createMultiMap<T>(): MultiMap<T>;
-    /**
-     * Tests whether a value is an array.
-     */
-    function isArray(value: any): value is ReadonlyArray<{}>;
-    function toArray<T>(value: T | T[]): T[];
-    function toArray<T>(value: T | ReadonlyArray<T>): ReadonlyArray<T>;
-    /**
-     * Tests whether a value is string
-     */
-    function isString(text: any): text is string;
-    function tryCast<TOut extends TIn, TIn = any>(value: TIn | undefined, test: (value: TIn) => value is TOut): TOut | undefined;
-    function cast<TOut extends TIn, TIn = any>(value: TIn | undefined, test: (value: TIn) => value is TOut): TOut;
-    /** Does nothing. */
-    function noop(_?: {} | null | undefined): void;
-    /** Do nothing and return false */
-    function returnFalse(): false;
-    /** Do nothing and return true */
-    function returnTrue(): true;
-    /** Returns its argument. */
-    function identity<T>(x: T): T;
-    /** Returns lower case string */
-    function toLowerCase(x: string): string;
-    /** Throws an error because a function is not implemented. */
-    function notImplemented(): never;
-    function memoize<T>(callback: () => T): () => T;
-    /**
-     * High-order function, creates a function that executes a function composition.
-     * For example, `chain(a, b)` is the equivalent of `x => ((a', b') => y => b'(a'(y)))(a(x), b(x))`
-     *
-     * @param args The functions to chain.
-     */
-    function chain<T, U>(...args: ((t: T) => (u: U) => U)[]): (t: T) => (u: U) => U;
-    /**
-     * High-order function, composes functions. Note that functions are composed inside-out;
-     * for example, `compose(a, b)` is the equivalent of `x => b(a(x))`.
-     *
-     * @param args The functions to compose.
-     */
-    function compose<T>(...args: ((t: T) => T)[]): (t: T) => T;
-    enum AssertionLevel {
-        None = 0,
-        Normal = 1,
-        Aggressive = 2,
-        VeryAggressive = 3
-    }
-    /**
-     * Safer version of `Function` which should not be called.
-     * Every function should be assignable to this, but this should not be assignable to every function.
-     */
-    type AnyFunction = (...args: never[]) => void;
-    namespace Debug {
-        let currentAssertionLevel: AssertionLevel;
-        let isDebugging: boolean;
-        function shouldAssert(level: AssertionLevel): boolean;
-        function assert(expression: boolean, message?: string, verboseDebugInfo?: string | (() => string), stackCrawlMark?: AnyFunction): void;
-        function assertEqual<T>(a: T, b: T, msg?: string, msg2?: string): void;
-        function assertLessThan(a: number, b: number, msg?: string): void;
-        function assertLessThanOrEqual(a: number, b: number): void;
-        function assertGreaterThanOrEqual(a: number, b: number): void;
-        function fail(message?: string, stackCrawlMark?: AnyFunction): never;
-        function assertDefined<T>(value: T | null | undefined, message?: string): T;
-        function assertEachDefined<T, A extends ReadonlyArray<T>>(value: A, message?: string): A;
-        function assertNever(member: never, message?: string, stackCrawlMark?: AnyFunction): never;
-        function getFunctionName(func: AnyFunction): any;
-    }
-    function equateValues<T>(a: T, b: T): boolean;
-    /**
-     * Compare the equality of two strings using a case-sensitive ordinal comparison.
-     *
-     * Case-sensitive comparisons compare both strings one code-point at a time using the integer
-     * value of each code-point after applying `toUpperCase` to each string. We always map both
-     * strings to their upper-case form as some unicode characters do not properly round-trip to
-     * lowercase (such as `ẞ` (German sharp capital s)).
-     */
-    function equateStringsCaseInsensitive(a: string, b: string): boolean;
-    /**
-     * Compare the equality of two strings using a case-sensitive ordinal comparison.
-     *
-     * Case-sensitive comparisons compare both strings one code-point at a time using the
-     * integer value of each code-point.
-     */
-    function equateStringsCaseSensitive(a: string, b: string): boolean;
-    /**
-     * Compare two numeric values for their order relative to each other.
-     * To compare strings, use any of the `compareStrings` functions.
-     */
-    function compareValues(a: number | undefined, b: number | undefined): Comparison;
-    function min<T>(a: T, b: T, compare: Comparer<T>): T;
-    /**
-     * Compare two strings using a case-insensitive ordinal comparison.
-     *
-     * Ordinal comparisons are based on the difference between the unicode code points of both
-     * strings. Characters with multiple unicode representations are considered unequal. Ordinal
-     * comparisons provide predictable ordering, but place "a" after "B".
-     *
-     * Case-insensitive comparisons compare both strings one code-point at a time using the integer
-     * value of each code-point after applying `toUpperCase` to each string. We always map both
-     * strings to their upper-case form as some unicode characters do not properly round-trip to
-     * lowercase (such as `ẞ` (German sharp capital s)).
-     */
-    function compareStringsCaseInsensitive(a: string, b: string): Comparison;
-    /**
-     * Compare two strings using a case-sensitive ordinal comparison.
-     *
-     * Ordinal comparisons are based on the difference between the unicode code points of both
-     * strings. Characters with multiple unicode representations are considered unequal. Ordinal
-     * comparisons provide predictable ordering, but place "a" after "B".
-     *
-     * Case-sensitive comparisons compare both strings one code-point at a time using the integer
-     * value of each code-point.
-     */
-    function compareStringsCaseSensitive(a: string | undefined, b: string | undefined): Comparison;
-    function getStringComparer(ignoreCase?: boolean): typeof compareStringsCaseInsensitive;
-    function getUILocale(): string | undefined;
-    function setUILocale(value: string | undefined): void;
-    /**
-     * Compare two strings in a using the case-sensitive sort behavior of the UI locale.
-     *
-     * Ordering is not predictable between different host locales, but is best for displaying
-     * ordered data for UI presentation. Characters with multiple unicode representations may
-     * be considered equal.
-     *
-     * Case-sensitive comparisons compare strings that differ in base characters, or
-     * accents/diacritic marks, or case as unequal.
-     */
-    function compareStringsCaseSensitiveUI(a: string, b: string): Comparison;
-    function compareProperties<T, K extends keyof T>(a: T | undefined, b: T | undefined, key: K, comparer: Comparer<T[K]>): Comparison;
-    /** True is greater than false. */
-    function compareBooleans(a: boolean, b: boolean): Comparison;
-    /**
-     * Given a name and a list of names that are *not* equal to the name, return a spelling suggestion if there is one that is close enough.
-     * Names less than length 3 only check for case-insensitive equality, not Levenshtein distance.
-     *
-     * If there is a candidate that's the same except for case, return that.
-     * If there is a candidate that's within one edit of the name, return that.
-     * Otherwise, return the candidate with the smallest Levenshtein distance,
-     *    except for candidates:
-     *      * With no name
-     *      * Whose length differs from the target name by more than 0.34 of the length of the name.
-     *      * Whose levenshtein distance is more than 0.4 of the length of the name
-     *        (0.4 allows 1 substitution/transposition for every 5 characters,
-     *         and 1 insertion/deletion at 3 characters)
-     */
-    function getSpellingSuggestion<T>(name: string, candidates: T[], getName: (candidate: T) => string | undefined): T | undefined;
-    function endsWith(str: string, suffix: string): boolean;
-    function removeSuffix(str: string, suffix: string): string;
-    function tryRemoveSuffix(str: string, suffix: string): string | undefined;
-    function stringContains(str: string, substring: string): boolean;
-    function fileExtensionIs(path: string, extension: string): boolean;
-    function fileExtensionIsOneOf(path: string, extensions: ReadonlyArray<string>): boolean;
-    /**
-     * Takes a string like "jquery-min.4.2.3" and returns "jquery"
-     */
-    function removeMinAndVersionNumbers(fileName: string): string;
-    /** Remove an item from an array, moving everything to its right one space left. */
-    function orderedRemoveItem<T>(array: T[], item: T): boolean;
-    /** Remove an item by index from an array, moving everything to its right one space left. */
-    function orderedRemoveItemAt<T>(array: T[], index: number): void;
-    function unorderedRemoveItemAt<T>(array: T[], index: number): void;
-    /** Remove the *first* occurrence of `item` from the array. */
-    function unorderedRemoveItem<T>(array: T[], item: T): boolean;
-    type GetCanonicalFileName = (fileName: string) => string;
-    function createGetCanonicalFileName(useCaseSensitiveFileNames: boolean): GetCanonicalFileName;
-    /** Represents a "prefix*suffix" pattern. */
-    interface Pattern {
-        prefix: string;
-        suffix: string;
-    }
-    function patternText({ prefix, suffix }: Pattern): string;
-    /**
-     * Given that candidate matches pattern, returns the text matching the '*'.
-     * E.g.: matchedText(tryParsePattern("foo*baz"), "foobarbaz") === "bar"
-     */
-    function matchedText(pattern: Pattern, candidate: string): string;
-    /** Return the object corresponding to the best pattern to match `candidate`. */
-    function findBestPatternMatch<T>(values: ReadonlyArray<T>, getPattern: (value: T) => Pattern, candidate: string): T | undefined;
-    function startsWith(str: string, prefix: string): boolean;
-    function removePrefix(str: string, prefix: string): string;
-    function tryRemovePrefix(str: string, prefix: string): string | undefined;
-    function and<T>(f: (arg: T) => boolean, g: (arg: T) => boolean): (arg: T) => boolean;
-    function or<T>(f: (arg: T) => boolean, g: (arg: T) => boolean): (arg: T) => boolean;
-    function assertTypeIsNever(_: never): void;
-    function singleElementArray<T>(t: T | undefined): T[] | undefined;
-    function enumerateInsertsAndDeletes<T, U>(newItems: ReadonlyArray<T>, oldItems: ReadonlyArray<U>, comparer: (a: T, b: U) => Comparison, inserted: (newItem: T) => void, deleted: (oldItem: U) => void, unchanged?: (oldItem: U, newItem: T) => void): void;
-}
-//# sourceMappingURL=core.d.ts.map
-declare namespace ts {
-    type Path = string & {
-        __pathBrand: any;
-    };
-    interface TextRange {
-        pos: number;
-        end: number;
-    }
-    type JsDocSyntaxKind = SyntaxKind.EndOfFileToken | SyntaxKind.WhitespaceTrivia | SyntaxKind.AtToken | SyntaxKind.NewLineTrivia | SyntaxKind.AsteriskToken | SyntaxKind.OpenBraceToken | SyntaxKind.CloseBraceToken | SyntaxKind.LessThanToken | SyntaxKind.OpenBracketToken | SyntaxKind.CloseBracketToken | SyntaxKind.EqualsToken | SyntaxKind.CommaToken | SyntaxKind.DotToken | SyntaxKind.Identifier | SyntaxKind.NoSubstitutionTemplateLiteral | SyntaxKind.Unknown;
-    type JsxTokenSyntaxKind = SyntaxKind.LessThanSlashToken | SyntaxKind.EndOfFileToken | SyntaxKind.ConflictMarkerTrivia | SyntaxKind.JsxText | SyntaxKind.JsxTextAllWhiteSpaces | SyntaxKind.OpenBraceToken | SyntaxKind.LessThanToken;
-    enum SyntaxKind {
-        Unknown = 0,
-        EndOfFileToken = 1,
-        SingleLineCommentTrivia = 2,
-        MultiLineCommentTrivia = 3,
-        NewLineTrivia = 4,
-        WhitespaceTrivia = 5,
-        ShebangTrivia = 6,
-        ConflictMarkerTrivia = 7,
-        NumericLiteral = 8,
-        StringLiteral = 9,
-        JsxText = 10,
-        JsxTextAllWhiteSpaces = 11,
-        RegularExpressionLiteral = 12,
-        NoSubstitutionTemplateLiteral = 13,
-        TemplateHead = 14,
-        TemplateMiddle = 15,
-        TemplateTail = 16,
-        OpenBraceToken = 17,
-        CloseBraceToken = 18,
-        OpenParenToken = 19,
-        CloseParenToken = 20,
-        OpenBracketToken = 21,
-        CloseBracketToken = 22,
-        DotToken = 23,
-        DotDotDotToken = 24,
-        SemicolonToken = 25,
-        CommaToken = 26,
-        LessThanToken = 27,
-        LessThanSlashToken = 28,
-        GreaterThanToken = 29,
-        LessThanEqualsToken = 30,
-        GreaterThanEqualsToken = 31,
-        EqualsEqualsToken = 32,
-        ExclamationEqualsToken = 33,
-        EqualsEqualsEqualsToken = 34,
-        ExclamationEqualsEqualsToken = 35,
-        EqualsGreaterThanToken = 36,
-        PlusToken = 37,
-        MinusToken = 38,
-        AsteriskToken = 39,
-        AsteriskAsteriskToken = 40,
-        SlashToken = 41,
-        PercentToken = 42,
-        PlusPlusToken = 43,
-        MinusMinusToken = 44,
-        LessThanLessThanToken = 45,
-        GreaterThanGreaterThanToken = 46,
-        GreaterThanGreaterThanGreaterThanToken = 47,
-        AmpersandToken = 48,
-        BarToken = 49,
-        CaretToken = 50,
-        ExclamationToken = 51,
-        TildeToken = 52,
-        AmpersandAmpersandToken = 53,
-        BarBarToken = 54,
-        QuestionToken = 55,
-        ColonToken = 56,
-        AtToken = 57,
-        EqualsToken = 58,
-        PlusEqualsToken = 59,
-        MinusEqualsToken = 60,
-        AsteriskEqualsToken = 61,
-        AsteriskAsteriskEqualsToken = 62,
-        SlashEqualsToken = 63,
-        PercentEqualsToken = 64,
-        LessThanLessThanEqualsToken = 65,
-        GreaterThanGreaterThanEqualsToken = 66,
-        GreaterThanGreaterThanGreaterThanEqualsToken = 67,
-        AmpersandEqualsToken = 68,
-        BarEqualsToken = 69,
-        CaretEqualsToken = 70,
-        Identifier = 71,
-        BreakKeyword = 72,
-        CaseKeyword = 73,
-        CatchKeyword = 74,
-        ClassKeyword = 75,
-        ConstKeyword = 76,
-        ContinueKeyword = 77,
-        DebuggerKeyword = 78,
-        DefaultKeyword = 79,
-        DeleteKeyword = 80,
-        DoKeyword = 81,
-        ElseKeyword = 82,
-        EnumKeyword = 83,
-        ExportKeyword = 84,
-        ExtendsKeyword = 85,
-        FalseKeyword = 86,
-        FinallyKeyword = 87,
-        ForKeyword = 88,
-        FunctionKeyword = 89,
-        IfKeyword = 90,
-        ImportKeyword = 91,
-        InKeyword = 92,
-        InstanceOfKeyword = 93,
-        NewKeyword = 94,
-        NullKeyword = 95,
-        ReturnKeyword = 96,
-        SuperKeyword = 97,
-        SwitchKeyword = 98,
-        ThisKeyword = 99,
-        ThrowKeyword = 100,
-        TrueKeyword = 101,
-        TryKeyword = 102,
-        TypeOfKeyword = 103,
-        VarKeyword = 104,
-        VoidKeyword = 105,
-        WhileKeyword = 106,
-        WithKeyword = 107,
-        ImplementsKeyword = 108,
-        InterfaceKeyword = 109,
-        LetKeyword = 110,
-        PackageKeyword = 111,
-        PrivateKeyword = 112,
-        ProtectedKeyword = 113,
-        PublicKeyword = 114,
-        StaticKeyword = 115,
-        YieldKeyword = 116,
-        AbstractKeyword = 117,
-        AsKeyword = 118,
-        AnyKeyword = 119,
-        AsyncKeyword = 120,
-        AwaitKeyword = 121,
-        BooleanKeyword = 122,
-        ConstructorKeyword = 123,
-        DeclareKeyword = 124,
-        GetKeyword = 125,
-        InferKeyword = 126,
-        IsKeyword = 127,
-        KeyOfKeyword = 128,
-        ModuleKeyword = 129,
-        NamespaceKeyword = 130,
-        NeverKeyword = 131,
-        ReadonlyKeyword = 132,
-        RequireKeyword = 133,
-        NumberKeyword = 134,
-        ObjectKeyword = 135,
-        SetKeyword = 136,
-        StringKeyword = 137,
-        SymbolKeyword = 138,
-        TypeKeyword = 139,
-        UndefinedKeyword = 140,
-        UniqueKeyword = 141,
-        UnknownKeyword = 142,
-        FromKeyword = 143,
-        GlobalKeyword = 144,
-        OfKeyword = 145,
-        QualifiedName = 146,
-        ComputedPropertyName = 147,
-        TypeParameter = 148,
-        Parameter = 149,
-        Decorator = 150,
-        PropertySignature = 151,
-        PropertyDeclaration = 152,
-        MethodSignature = 153,
-        MethodDeclaration = 154,
-        Constructor = 155,
-        GetAccessor = 156,
-        SetAccessor = 157,
-        CallSignature = 158,
-        ConstructSignature = 159,
-        IndexSignature = 160,
-        TypePredicate = 161,
-        TypeReference = 162,
-        FunctionType = 163,
-        ConstructorType = 164,
-        TypeQuery = 165,
-        TypeLiteral = 166,
-        ArrayType = 167,
-        TupleType = 168,
-        UnionType = 169,
-        IntersectionType = 170,
-        ConditionalType = 171,
-        InferType = 172,
-        ParenthesizedType = 173,
-        ThisType = 174,
-        TypeOperator = 175,
-        IndexedAccessType = 176,
-        MappedType = 177,
-        LiteralType = 178,
-        ImportType = 179,
-        ObjectBindingPattern = 180,
-        ArrayBindingPattern = 181,
-        BindingElement = 182,
-        ArrayLiteralExpression = 183,
-        ObjectLiteralExpression = 184,
-        PropertyAccessExpression = 185,
-        ElementAccessExpression = 186,
-        CallExpression = 187,
-        NewExpression = 188,
-        TaggedTemplateExpression = 189,
-        TypeAssertionExpression = 190,
-        ParenthesizedExpression = 191,
-        FunctionExpression = 192,
-        ArrowFunction = 193,
-        DeleteExpression = 194,
-        TypeOfExpression = 195,
-        VoidExpression = 196,
-        AwaitExpression = 197,
-        PrefixUnaryExpression = 198,
-        PostfixUnaryExpression = 199,
-        BinaryExpression = 200,
-        ConditionalExpression = 201,
-        TemplateExpression = 202,
-        YieldExpression = 203,
-        SpreadElement = 204,
-        ClassExpression = 205,
-        OmittedExpression = 206,
-        ExpressionWithTypeArguments = 207,
-        AsExpression = 208,
-        NonNullExpression = 209,
-        MetaProperty = 210,
-        TemplateSpan = 211,
-        SemicolonClassElement = 212,
-        Block = 213,
-        VariableStatement = 214,
-        EmptyStatement = 215,
-        ExpressionStatement = 216,
-        IfStatement = 217,
-        DoStatement = 218,
-        WhileStatement = 219,
-        ForStatement = 220,
-        ForInStatement = 221,
-        ForOfStatement = 222,
-        ContinueStatement = 223,
-        BreakStatement = 224,
-        ReturnStatement = 225,
-        WithStatement = 226,
-        SwitchStatement = 227,
-        LabeledStatement = 228,
-        ThrowStatement = 229,
-        TryStatement = 230,
-        DebuggerStatement = 231,
-        VariableDeclaration = 232,
-        VariableDeclarationList = 233,
-        FunctionDeclaration = 234,
-        ClassDeclaration = 235,
-        InterfaceDeclaration = 236,
-        TypeAliasDeclaration = 237,
-        EnumDeclaration = 238,
-        ModuleDeclaration = 239,
-        ModuleBlock = 240,
-        CaseBlock = 241,
-        NamespaceExportDeclaration = 242,
-        ImportEqualsDeclaration = 243,
-        ImportDeclaration = 244,
-        ImportClause = 245,
-        NamespaceImport = 246,
-        NamedImports = 247,
-        ImportSpecifier = 248,
-        ExportAssignment = 249,
-        ExportDeclaration = 250,
-        NamedExports = 251,
-        ExportSpecifier = 252,
-        MissingDeclaration = 253,
-        ExternalModuleReference = 254,
-        JsxElement = 255,
-        JsxSelfClosingElement = 256,
-        JsxOpeningElement = 257,
-        JsxClosingElement = 258,
-        JsxFragment = 259,
-        JsxOpeningFragment = 260,
-        JsxClosingFragment = 261,
-        JsxAttribute = 262,
-        JsxAttributes = 263,
-        JsxSpreadAttribute = 264,
-        JsxExpression = 265,
-        CaseClause = 266,
-        DefaultClause = 267,
-        HeritageClause = 268,
-        CatchClause = 269,
-        PropertyAssignment = 270,
-        ShorthandPropertyAssignment = 271,
-        SpreadAssignment = 272,
-        EnumMember = 273,
-        SourceFile = 274,
-        Bundle = 275,
-        UnparsedSource = 276,
-        InputFiles = 277,
-        JSDocTypeExpression = 278,
-        JSDocAllType = 279,
-        JSDocUnknownType = 280,
-        JSDocNullableType = 281,
-        JSDocNonNullableType = 282,
-        JSDocOptionalType = 283,
-        JSDocFunctionType = 284,
-        JSDocVariadicType = 285,
-        JSDocComment = 286,
-        JSDocTypeLiteral = 287,
-        JSDocSignature = 288,
-        JSDocTag = 289,
-        JSDocAugmentsTag = 290,
-        JSDocClassTag = 291,
-        JSDocCallbackTag = 292,
-        JSDocParameterTag = 293,
-        JSDocReturnTag = 294,
-        JSDocTypeTag = 295,
-        JSDocTemplateTag = 296,
-        JSDocTypedefTag = 297,
-        JSDocPropertyTag = 298,
-        SyntaxList = 299,
-        NotEmittedStatement = 300,
-        PartiallyEmittedExpression = 301,
-        CommaListExpression = 302,
-        MergeDeclarationMarker = 303,
-        EndOfDeclarationMarker = 304,
-        Count = 305,
-        FirstAssignment = 58,
-        LastAssignment = 70,
-        FirstCompoundAssignment = 59,
-        LastCompoundAssignment = 70,
-        FirstReservedWord = 72,
-        LastReservedWord = 107,
-        FirstKeyword = 72,
-        LastKeyword = 145,
-        FirstFutureReservedWord = 108,
-        LastFutureReservedWord = 116,
-        FirstTypeNode = 161,
-        LastTypeNode = 179,
-        FirstPunctuation = 17,
-        LastPunctuation = 70,
-        FirstToken = 0,
-        LastToken = 145,
-        FirstTriviaToken = 2,
-        LastTriviaToken = 7,
-        FirstLiteralToken = 8,
-        LastLiteralToken = 13,
-        FirstTemplateToken = 13,
-        LastTemplateToken = 16,
-        FirstBinaryOperator = 27,
-        LastBinaryOperator = 70,
-        FirstNode = 146,
-        FirstJSDocNode = 278,
-        LastJSDocNode = 298,
-        FirstJSDocTagNode = 289,
-        LastJSDocTagNode = 298,
-        FirstContextualKeyword = 117,
-        LastContextualKeyword = 145
-    }
-    enum NodeFlags {
-        None = 0,
-        Let = 1,
-        Const = 2,
-        NestedNamespace = 4,
-        Synthesized = 8,
-        Namespace = 16,
-        ExportContext = 32,
-        ContainsThis = 64,
-        HasImplicitReturn = 128,
-        HasExplicitReturn = 256,
-        GlobalAugmentation = 512,
-        HasAsyncFunctions = 1024,
-        DisallowInContext = 2048,
-        YieldContext = 4096,
-        DecoratorContext = 8192,
-        AwaitContext = 16384,
-        ThisNodeHasError = 32768,
-        JavaScriptFile = 65536,
-        ThisNodeOrAnySubNodesHasError = 131072,
-        HasAggregatedChildData = 262144,
-        PossiblyContainsDynamicImport = 524288,
-        PossiblyContainsImportMeta = 1048576,
-        JSDoc = 2097152,
-        Ambient = 4194304,
-        InWithStatement = 8388608,
-        JsonFile = 16777216,
-        BlockScoped = 3,
-        ReachabilityCheckFlags = 384,
-        ReachabilityAndEmitFlags = 1408,
-        ContextFlags = 12679168,
-        TypeExcludesFlags = 20480,
-        PermanentlySetIncrementalFlags = 1572864
-    }
-    enum ModifierFlags {
-        None = 0,
-        Export = 1,
-        Ambient = 2,
-        Public = 4,
-        Private = 8,
-        Protected = 16,
-        Static = 32,
-        Readonly = 64,
-        Abstract = 128,
-        Async = 256,
-        Default = 512,
-        Const = 2048,
-        HasComputedFlags = 536870912,
-        AccessibilityModifier = 28,
-        ParameterPropertyModifier = 92,
-        NonPublicAccessibilityModifier = 24,
-        TypeScriptModifier = 2270,
-        ExportDefault = 513,
-        All = 3071
-    }
-    enum JsxFlags {
-        None = 0,
-        /** An element from a named property of the JSX.IntrinsicElements interface */
-        IntrinsicNamedElement = 1,
-        /** An element inferred from the string index signature of the JSX.IntrinsicElements interface */
-        IntrinsicIndexedElement = 2,
-        IntrinsicElement = 3
-    }
-    enum RelationComparisonResult {
-        Succeeded = 1,
-        Failed = 2,
-        FailedAndReported = 3
-    }
-    interface Node extends TextRange {
-        kind: SyntaxKind;
-        flags: NodeFlags;
-        modifierFlagsCache?: ModifierFlags;
-        transformFlags: TransformFlags;
-        decorators?: NodeArray<Decorator>;
-        modifiers?: ModifiersArray;
-        id?: number;
-        parent: Node;
-        original?: Node;
-        symbol: Symbol;
-        locals?: SymbolTable;
-        nextContainer?: Node;
-        localSymbol?: Symbol;
-        flowNode?: FlowNode;
-        emitNode?: EmitNode;
-        contextualType?: Type;
-        contextualMapper?: TypeMapper;
-    }
-    interface JSDocContainer {
-        jsDoc?: JSDoc[];
-        jsDocCache?: ReadonlyArray<JSDocTag>;
-    }
-    type HasJSDoc = ParameterDeclaration | CallSignatureDeclaration | ConstructSignatureDeclaration | MethodSignature | PropertySignature | ArrowFunction | ParenthesizedExpression | SpreadAssignment | ShorthandPropertyAssignment | PropertyAssignment | FunctionExpression | LabeledStatement | ExpressionStatement | VariableStatement | FunctionDeclaration | ConstructorDeclaration | MethodDeclaration | PropertyDeclaration | AccessorDeclaration | ClassLikeDeclaration | InterfaceDeclaration | TypeAliasDeclaration | EnumMember | EnumDeclaration | ModuleDeclaration | ImportEqualsDeclaration | IndexSignatureDeclaration | FunctionTypeNode | ConstructorTypeNode | JSDocFunctionType | EndOfFileToken;
-    type HasType = SignatureDeclaration | VariableDeclaration | ParameterDeclaration | PropertySignature | PropertyDeclaration | TypePredicateNode | ParenthesizedTypeNode | TypeOperatorNode | MappedTypeNode | AssertionExpression | TypeAliasDeclaration | JSDocTypeExpression | JSDocNonNullableType | JSDocNullableType | JSDocOptionalType | JSDocVariadicType;
-    type HasInitializer = HasExpressionInitializer | ForStatement | ForInStatement | ForOfStatement | JsxAttribute;
-    type HasExpressionInitializer = VariableDeclaration | ParameterDeclaration | BindingElement | PropertySignature | PropertyDeclaration | PropertyAssignment | EnumMember;
-    type MutableNodeArray<T extends Node> = NodeArray<T> & T[];
-    interface NodeArray<T extends Node> extends ReadonlyArray<T>, TextRange {
-        hasTrailingComma?: boolean;
-        transformFlags: TransformFlags;
-    }
-    interface Token<TKind extends SyntaxKind> extends Node {
-        kind: TKind;
-    }
-    type DotDotDotToken = Token<SyntaxKind.DotDotDotToken>;
-    type QuestionToken = Token<SyntaxKind.QuestionToken>;
-    type ExclamationToken = Token<SyntaxKind.ExclamationToken>;
-    type ColonToken = Token<SyntaxKind.ColonToken>;
-    type EqualsToken = Token<SyntaxKind.EqualsToken>;
-    type AsteriskToken = Token<SyntaxKind.AsteriskToken>;
-    type EqualsGreaterThanToken = Token<SyntaxKind.EqualsGreaterThanToken>;
-    type EndOfFileToken = Token<SyntaxKind.EndOfFileToken> & JSDocContainer;
-    type AtToken = Token<SyntaxKind.AtToken>;
-    type ReadonlyToken = Token<SyntaxKind.ReadonlyKeyword>;
-    type AwaitKeywordToken = Token<SyntaxKind.AwaitKeyword>;
-    type PlusToken = Token<SyntaxKind.PlusToken>;
-    type MinusToken = Token<SyntaxKind.MinusToken>;
-    type Modifier = Token<SyntaxKind.AbstractKeyword> | Token<SyntaxKind.AsyncKeyword> | Token<SyntaxKind.ConstKeyword> | Token<SyntaxKind.DeclareKeyword> | Token<SyntaxKind.DefaultKeyword> | Token<SyntaxKind.ExportKeyword> | Token<SyntaxKind.PublicKeyword> | Token<SyntaxKind.PrivateKeyword> | Token<SyntaxKind.ProtectedKeyword> | Token<SyntaxKind.ReadonlyKeyword> | Token<SyntaxKind.StaticKeyword>;
-    type ModifiersArray = NodeArray<Modifier>;
-    enum GeneratedIdentifierFlags {
-        None = 0,
-        Auto = 1,
-        Loop = 2,
-        Unique = 3,
-        Node = 4,
-        KindMask = 7,
-        ReservedInNestedScopes = 8,
-        Optimistic = 16,
-        FileLevel = 32
-    }
-    interface Identifier extends PrimaryExpression, Declaration {
-        kind: SyntaxKind.Identifier;
-        /**
-         * Prefer to use `id.unescapedText`. (Note: This is available only in services, not internally to the TypeScript compiler.)
-         * Text of identifier, but if the identifier begins with two underscores, this will begin with three.
-         */
-        escapedText: __String;
-        originalKeywordKind?: SyntaxKind;
-        autoGenerateFlags?: GeneratedIdentifierFlags;
-        autoGenerateId?: number;
-        isInJSDocNamespace?: boolean;
-        typeArguments?: NodeArray<TypeNode | TypeParameterDeclaration>;
-        jsdocDotPos?: number;
-    }
-    interface TransientIdentifier extends Identifier {
-        resolvedSymbol: Symbol;
-    }
-    interface GeneratedIdentifier extends Identifier {
-        autoGenerateFlags: GeneratedIdentifierFlags;
-    }
-    interface QualifiedName extends Node {
-        kind: SyntaxKind.QualifiedName;
-        left: EntityName;
-        right: Identifier;
-        jsdocDotPos?: number;
-    }
-    type EntityName = Identifier | QualifiedName;
-    type PropertyName = Identifier | StringLiteral | NumericLiteral | ComputedPropertyName;
-    type DeclarationName = Identifier | StringLiteral | NumericLiteral | ComputedPropertyName | BindingPattern;
-    interface Declaration extends Node {
-        _declarationBrand: any;
-    }
-    interface NamedDeclaration extends Declaration {
-        name?: DeclarationName;
-    }
-    interface DynamicNamedDeclaration extends NamedDeclaration {
-        name: ComputedPropertyName;
-    }
-    interface LateBoundDeclaration extends DynamicNamedDeclaration {
-        name: LateBoundName;
-    }
-    interface DeclarationStatement extends NamedDeclaration, Statement {
-        name?: Identifier | StringLiteral | NumericLiteral;
-    }
-    interface ComputedPropertyName extends Node {
-        kind: SyntaxKind.ComputedPropertyName;
-        expression: Expression;
-    }
-    interface LateBoundName extends ComputedPropertyName {
-        expression: EntityNameExpression;
-    }
-    interface Decorator extends Node {
-        kind: SyntaxKind.Decorator;
-        parent: NamedDeclaration;
-        expression: LeftHandSideExpression;
-    }
-    interface TypeParameterDeclaration extends NamedDeclaration {
-        kind: SyntaxKind.TypeParameter;
-        parent: DeclarationWithTypeParameters | InferTypeNode;
-        name: Identifier;
-        constraint?: TypeNode;
-        default?: TypeNode;
-        expression?: Expression;
-    }
-    interface SignatureDeclarationBase extends NamedDeclaration, JSDocContainer {
-        kind: SignatureDeclaration["kind"];
-        name?: PropertyName;
-        typeParameters?: NodeArray<TypeParameterDeclaration>;
-        parameters: NodeArray<ParameterDeclaration>;
-        type?: TypeNode;
-        typeArguments?: NodeArray<TypeNode>;
-    }
-    type SignatureDeclaration = CallSignatureDeclaration | ConstructSignatureDeclaration | MethodSignature | IndexSignatureDeclaration | FunctionTypeNode | ConstructorTypeNode | JSDocFunctionType | FunctionDeclaration | MethodDeclaration | ConstructorDeclaration | AccessorDeclaration | FunctionExpression | ArrowFunction;
-    interface CallSignatureDeclaration extends SignatureDeclarationBase, TypeElement {
-        kind: SyntaxKind.CallSignature;
-    }
-    interface ConstructSignatureDeclaration extends SignatureDeclarationBase, TypeElement {
-        kind: SyntaxKind.ConstructSignature;
-    }
-    type BindingName = Identifier | BindingPattern;
-    interface VariableDeclaration extends NamedDeclaration {
-        kind: SyntaxKind.VariableDeclaration;
-        parent: VariableDeclarationList | CatchClause;
-        name: BindingName;
-        exclamationToken?: ExclamationToken;
-        type?: TypeNode;
-        initializer?: Expression;
-    }
-    interface VariableDeclarationList extends Node {
-        kind: SyntaxKind.VariableDeclarationList;
-        parent: VariableStatement | ForStatement | ForOfStatement | ForInStatement;
-        declarations: NodeArray<VariableDeclaration>;
-    }
-    interface ParameterDeclaration extends NamedDeclaration, JSDocContainer {
-        kind: SyntaxKind.Parameter;
-        parent: SignatureDeclaration;
-        dotDotDotToken?: DotDotDotToken;
-        name: BindingName;
-        questionToken?: QuestionToken;
-        type?: TypeNode;
-        initializer?: Expression;
-    }
-    interface BindingElement extends NamedDeclaration {
-        kind: SyntaxKind.BindingElement;
-        parent: BindingPattern;
-        propertyName?: PropertyName;
-        dotDotDotToken?: DotDotDotToken;
-        name: BindingName;
-        initializer?: Expression;
-    }
-    type BindingElementGrandparent = BindingElement["parent"]["parent"];
-    interface PropertySignature extends TypeElement, JSDocContainer {
-        kind: SyntaxKind.PropertySignature;
-        name: PropertyName;
-        questionToken?: QuestionToken;
-        type?: TypeNode;
-        initializer?: Expression;
-    }
-    interface PropertyDeclaration extends ClassElement, JSDocContainer {
-        kind: SyntaxKind.PropertyDeclaration;
-        parent: ClassLikeDeclaration;
-        name: PropertyName;
-        questionToken?: QuestionToken;
-        exclamationToken?: ExclamationToken;
-        type?: TypeNode;
-        initializer?: Expression;
-    }
-    interface ObjectLiteralElement extends NamedDeclaration {
-        _objectLiteralBrandBrand: any;
-        name?: PropertyName;
-    }
-    type ObjectLiteralElementLike = PropertyAssignment | ShorthandPropertyAssignment | SpreadAssignment | MethodDeclaration | AccessorDeclaration;
-    interface PropertyAssignment extends ObjectLiteralElement, JSDocContainer {
-        parent: ObjectLiteralExpression;
-        kind: SyntaxKind.PropertyAssignment;
-        name: PropertyName;
-        questionToken?: QuestionToken;
-        initializer: Expression;
-    }
-    interface ShorthandPropertyAssignment extends ObjectLiteralElement, JSDocContainer {
-        parent: ObjectLiteralExpression;
-        kind: SyntaxKind.ShorthandPropertyAssignment;
-        name: Identifier;
-        questionToken?: QuestionToken;
-        equalsToken?: Token<SyntaxKind.EqualsToken>;
-        objectAssignmentInitializer?: Expression;
-    }
-    interface SpreadAssignment extends ObjectLiteralElement, JSDocContainer {
-        parent: ObjectLiteralExpression;
-        kind: SyntaxKind.SpreadAssignment;
-        expression: Expression;
-    }
-    type VariableLikeDeclaration = VariableDeclaration | ParameterDeclaration | BindingElement | PropertyDeclaration | PropertyAssignment | PropertySignature | JsxAttribute | ShorthandPropertyAssignment | EnumMember | JSDocPropertyTag | JSDocParameterTag;
-    interface PropertyLikeDeclaration extends NamedDeclaration {
-        name: PropertyName;
-    }
-    interface ObjectBindingPattern extends Node {
-        kind: SyntaxKind.ObjectBindingPattern;
-        parent: VariableDeclaration | ParameterDeclaration | BindingElement;
-        elements: NodeArray<BindingElement>;
-    }
-    interface ArrayBindingPattern extends Node {
-        kind: SyntaxKind.ArrayBindingPattern;
-        parent: VariableDeclaration | ParameterDeclaration | BindingElement;
-        elements: NodeArray<ArrayBindingElement>;
-    }
-    type BindingPattern = ObjectBindingPattern | ArrayBindingPattern;
-    type ArrayBindingElement = BindingElement | OmittedExpression;
-    /**
-     * Several node kinds share function-like features such as a signature,
-     * a name, and a body. These nodes should extend FunctionLikeDeclarationBase.
-     * Examples:
-     * - FunctionDeclaration
-     * - MethodDeclaration
-     * - AccessorDeclaration
-     */
-    interface FunctionLikeDeclarationBase extends SignatureDeclarationBase {
-        _functionLikeDeclarationBrand: any;
-        asteriskToken?: AsteriskToken;
-        questionToken?: QuestionToken;
-        body?: Block | Expression;
-    }
-    type FunctionLikeDeclaration = FunctionDeclaration | MethodDeclaration | GetAccessorDeclaration | SetAccessorDeclaration | ConstructorDeclaration | FunctionExpression | ArrowFunction;
-    /** @deprecated Use SignatureDeclaration */
-    type FunctionLike = SignatureDeclaration;
-    interface FunctionDeclaration extends FunctionLikeDeclarationBase, DeclarationStatement {
-        kind: SyntaxKind.FunctionDeclaration;
-        name?: Identifier;
-        body?: FunctionBody;
-    }
-    interface MethodSignature extends SignatureDeclarationBase, TypeElement {
-        kind: SyntaxKind.MethodSignature;
-        parent: ObjectTypeDeclaration;
-        name: PropertyName;
-    }
-    interface MethodDeclaration extends FunctionLikeDeclarationBase, ClassElement, ObjectLiteralElement, JSDocContainer {
-        kind: SyntaxKind.MethodDeclaration;
-        parent: ClassLikeDeclaration | ObjectLiteralExpression;
-        name: PropertyName;
-        body?: FunctionBody;
-    }
-    interface ConstructorDeclaration extends FunctionLikeDeclarationBase, ClassElement, JSDocContainer {
-        kind: SyntaxKind.Constructor;
-        parent: ClassLikeDeclaration;
-        body?: FunctionBody;
-        returnFlowNode?: FlowNode;
-    }
-    /** For when we encounter a semicolon in a class declaration. ES6 allows these as class elements. */
-    interface SemicolonClassElement extends ClassElement {
-        kind: SyntaxKind.SemicolonClassElement;
-        parent: ClassLikeDeclaration;
-    }
-    interface GetAccessorDeclaration extends FunctionLikeDeclarationBase, ClassElement, ObjectLiteralElement, JSDocContainer {
-        kind: SyntaxKind.GetAccessor;
-        parent: ClassLikeDeclaration | ObjectLiteralExpression;
-        name: PropertyName;
-        body?: FunctionBody;
-    }
-    interface SetAccessorDeclaration extends FunctionLikeDeclarationBase, ClassElement, ObjectLiteralElement, JSDocContainer {
-        kind: SyntaxKind.SetAccessor;
-        parent: ClassLikeDeclaration | ObjectLiteralExpression;
-        name: PropertyName;
-        body?: FunctionBody;
-    }
-    type AccessorDeclaration = GetAccessorDeclaration | SetAccessorDeclaration;
-    interface IndexSignatureDeclaration extends SignatureDeclarationBase, ClassElement, TypeElement {
-        kind: SyntaxKind.IndexSignature;
-        parent: ObjectTypeDeclaration;
-    }
-    interface TypeNode extends Node {
-        _typeNodeBrand: any;
-    }
-    interface KeywordTypeNode extends TypeNode {
-        kind: SyntaxKind.AnyKeyword | SyntaxKind.UnknownKeyword | SyntaxKind.NumberKeyword | SyntaxKind.ObjectKeyword | SyntaxKind.BooleanKeyword | SyntaxKind.StringKeyword | SyntaxKind.SymbolKeyword | SyntaxKind.ThisKeyword | SyntaxKind.VoidKeyword | SyntaxKind.UndefinedKeyword | SyntaxKind.NullKeyword | SyntaxKind.NeverKeyword;
-    }
-    interface ImportTypeNode extends NodeWithTypeArguments {
-        kind: SyntaxKind.ImportType;
-        isTypeOf?: boolean;
-        argument: TypeNode;
-        qualifier?: EntityName;
-    }
-    type LiteralImportTypeNode = ImportTypeNode & {
-        argument: LiteralTypeNode & {
-            literal: StringLiteral;
-        };
-    };
-    interface ThisTypeNode extends TypeNode {
-        kind: SyntaxKind.ThisType;
-    }
-    type FunctionOrConstructorTypeNode = FunctionTypeNode | ConstructorTypeNode;
-    interface FunctionOrConstructorTypeNodeBase extends TypeNode, SignatureDeclarationBase {
-        kind: SyntaxKind.FunctionType | SyntaxKind.ConstructorType;
-        type: TypeNode;
-    }
-    interface FunctionTypeNode extends FunctionOrConstructorTypeNodeBase {
-        kind: SyntaxKind.FunctionType;
-    }
-    interface ConstructorTypeNode extends FunctionOrConstructorTypeNodeBase {
-        kind: SyntaxKind.ConstructorType;
-    }
-    interface NodeWithTypeArguments extends TypeNode {
-        typeArguments?: NodeArray<TypeNode>;
-    }
-    type TypeReferenceType = TypeReferenceNode | ExpressionWithTypeArguments;
-    interface TypeReferenceNode extends NodeWithTypeArguments {
-        kind: SyntaxKind.TypeReference;
-        typeName: EntityName;
-    }
-    interface TypePredicateNode extends TypeNode {
-        kind: SyntaxKind.TypePredicate;
-        parent: SignatureDeclaration;
-        parameterName: Identifier | ThisTypeNode;
-        type: TypeNode;
-    }
-    interface TypeQueryNode extends TypeNode {
-        kind: SyntaxKind.TypeQuery;
-        exprName: EntityName;
-    }
-    interface TypeLiteralNode extends TypeNode, Declaration {
-        kind: SyntaxKind.TypeLiteral;
-        members: NodeArray<TypeElement>;
-    }
-    interface ArrayTypeNode extends TypeNode {
-        kind: SyntaxKind.ArrayType;
-        elementType: TypeNode;
-    }
-    interface TupleTypeNode extends TypeNode {
-        kind: SyntaxKind.TupleType;
-        elementTypes: NodeArray<TypeNode>;
-    }
-    type UnionOrIntersectionTypeNode = UnionTypeNode | IntersectionTypeNode;
-    interface UnionTypeNode extends TypeNode {
-        kind: SyntaxKind.UnionType;
-        types: NodeArray<TypeNode>;
-    }
-    interface IntersectionTypeNode extends TypeNode {
-        kind: SyntaxKind.IntersectionType;
-        types: NodeArray<TypeNode>;
-    }
-    interface ConditionalTypeNode extends TypeNode {
-        kind: SyntaxKind.ConditionalType;
-        checkType: TypeNode;
-        extendsType: TypeNode;
-        trueType: TypeNode;
-        falseType: TypeNode;
-    }
-    interface InferTypeNode extends TypeNode {
-        kind: SyntaxKind.InferType;
-        typeParameter: TypeParameterDeclaration;
-    }
-    interface ParenthesizedTypeNode extends TypeNode {
-        kind: SyntaxKind.ParenthesizedType;
-        type: TypeNode;
-    }
-    interface TypeOperatorNode extends TypeNode {
-        kind: SyntaxKind.TypeOperator;
-        operator: SyntaxKind.KeyOfKeyword | SyntaxKind.UniqueKeyword;
-        type: TypeNode;
-    }
-    interface UniqueTypeOperatorNode extends TypeOperatorNode {
-        operator: SyntaxKind.UniqueKeyword;
-    }
-    interface IndexedAccessTypeNode extends TypeNode {
-        kind: SyntaxKind.IndexedAccessType;
-        objectType: TypeNode;
-        indexType: TypeNode;
-    }
-    interface MappedTypeNode extends TypeNode, Declaration {
-        kind: SyntaxKind.MappedType;
-        readonlyToken?: ReadonlyToken | PlusToken | MinusToken;
-        typeParameter: TypeParameterDeclaration;
-        questionToken?: QuestionToken | PlusToken | MinusToken;
-        type?: TypeNode;
-    }
-    interface LiteralTypeNode extends TypeNode {
-        kind: SyntaxKind.LiteralType;
-        literal: BooleanLiteral | LiteralExpression | PrefixUnaryExpression;
-    }
-    interface StringLiteral extends LiteralExpression {
-        kind: SyntaxKind.StringLiteral;
-        textSourceNode?: Identifier | StringLiteralLike | NumericLiteral;
-        /** Note: this is only set when synthesizing a node, not during parsing. */
-        singleQuote?: boolean;
-    }
-    type StringLiteralLike = StringLiteral | NoSubstitutionTemplateLiteral;
-    interface Expression extends Node {
-        _expressionBrand: any;
-    }
-    interface OmittedExpression extends Expression {
-        kind: SyntaxKind.OmittedExpression;
-    }
-    interface PartiallyEmittedExpression extends LeftHandSideExpression {
-        kind: SyntaxKind.PartiallyEmittedExpression;
-        expression: Expression;
-    }
-    interface UnaryExpression extends Expression {
-        _unaryExpressionBrand: any;
-    }
-    /** Deprecated, please use UpdateExpression */
-    type IncrementExpression = UpdateExpression;
-    interface UpdateExpression extends UnaryExpression {
-        _updateExpressionBrand: any;
-    }
-    type PrefixUnaryOperator = SyntaxKind.PlusPlusToken | SyntaxKind.MinusMinusToken | SyntaxKind.PlusToken | SyntaxKind.MinusToken | SyntaxKind.TildeToken | SyntaxKind.ExclamationToken;
-    interface PrefixUnaryExpression extends UpdateExpression {
-        kind: SyntaxKind.PrefixUnaryExpression;
-        operator: PrefixUnaryOperator;
-        operand: UnaryExpression;
-    }
-    type PostfixUnaryOperator = SyntaxKind.PlusPlusToken | SyntaxKind.MinusMinusToken;
-    interface PostfixUnaryExpression extends UpdateExpression {
-        kind: SyntaxKind.PostfixUnaryExpression;
-        operand: LeftHandSideExpression;
-        operator: PostfixUnaryOperator;
-    }
-    interface LeftHandSideExpression extends UpdateExpression {
-        _leftHandSideExpressionBrand: any;
-    }
-    interface MemberExpression extends LeftHandSideExpression {
-        _memberExpressionBrand: any;
-    }
-    interface PrimaryExpression extends MemberExpression {
-        _primaryExpressionBrand: any;
-    }
-    interface NullLiteral extends PrimaryExpression, TypeNode {
-        kind: SyntaxKind.NullKeyword;
-    }
-    interface BooleanLiteral extends PrimaryExpression, TypeNode {
-        kind: SyntaxKind.TrueKeyword | SyntaxKind.FalseKeyword;
-    }
-    interface ThisExpression extends PrimaryExpression, KeywordTypeNode {
-        kind: SyntaxKind.ThisKeyword;
-    }
-    interface SuperExpression extends PrimaryExpression {
-        kind: SyntaxKind.SuperKeyword;
-    }
-    interface ImportExpression extends PrimaryExpression {
-        kind: SyntaxKind.ImportKeyword;
-    }
-    interface DeleteExpression extends UnaryExpression {
-        kind: SyntaxKind.DeleteExpression;
-        expression: UnaryExpression;
-    }
-    interface TypeOfExpression extends UnaryExpression {
-        kind: SyntaxKind.TypeOfExpression;
-        expression: UnaryExpression;
-    }
-    interface VoidExpression extends UnaryExpression {
-        kind: SyntaxKind.VoidExpression;
-        expression: UnaryExpression;
-    }
-    interface AwaitExpression extends UnaryExpression {
-        kind: SyntaxKind.AwaitExpression;
-        expression: UnaryExpression;
-    }
-    interface YieldExpression extends Expression {
-        kind: SyntaxKind.YieldExpression;
-        asteriskToken?: AsteriskToken;
-        expression?: Expression;
-    }
-    type ExponentiationOperator = SyntaxKind.AsteriskAsteriskToken;
-    type MultiplicativeOperator = SyntaxKind.AsteriskToken | SyntaxKind.SlashToken | SyntaxKind.PercentToken;
-    type MultiplicativeOperatorOrHigher = ExponentiationOperator | MultiplicativeOperator;
-    type AdditiveOperator = SyntaxKind.PlusToken | SyntaxKind.MinusToken;
-    type AdditiveOperatorOrHigher = MultiplicativeOperatorOrHigher | AdditiveOperator;
-    type ShiftOperator = SyntaxKind.LessThanLessThanToken | SyntaxKind.GreaterThanGreaterThanToken | SyntaxKind.GreaterThanGreaterThanGreaterThanToken;
-    type ShiftOperatorOrHigher = AdditiveOperatorOrHigher | ShiftOperator;
-    type RelationalOperator = SyntaxKind.LessThanToken | SyntaxKind.LessThanEqualsToken | SyntaxKind.GreaterThanToken | SyntaxKind.GreaterThanEqualsToken | SyntaxKind.InstanceOfKeyword | SyntaxKind.InKeyword;
-    type RelationalOperatorOrHigher = ShiftOperatorOrHigher | RelationalOperator;
-    type EqualityOperator = SyntaxKind.EqualsEqualsToken | SyntaxKind.EqualsEqualsEqualsToken | SyntaxKind.ExclamationEqualsEqualsToken | SyntaxKind.ExclamationEqualsToken;
-    type EqualityOperatorOrHigher = RelationalOperatorOrHigher | EqualityOperator;
-    type BitwiseOperator = SyntaxKind.AmpersandToken | SyntaxKind.BarToken | SyntaxKind.CaretToken;
-    type BitwiseOperatorOrHigher = EqualityOperatorOrHigher | BitwiseOperator;
-    type LogicalOperator = SyntaxKind.AmpersandAmpersandToken | SyntaxKind.BarBarToken;
-    type LogicalOperatorOrHigher = BitwiseOperatorOrHigher | LogicalOperator;
-    type CompoundAssignmentOperator = SyntaxKind.PlusEqualsToken | SyntaxKind.MinusEqualsToken | SyntaxKind.AsteriskAsteriskEqualsToken | SyntaxKind.AsteriskEqualsToken | SyntaxKind.SlashEqualsToken | SyntaxKind.PercentEqualsToken | SyntaxKind.AmpersandEqualsToken | SyntaxKind.BarEqualsToken | SyntaxKind.CaretEqualsToken | SyntaxKind.LessThanLessThanEqualsToken | SyntaxKind.GreaterThanGreaterThanGreaterThanEqualsToken | SyntaxKind.GreaterThanGreaterThanEqualsToken;
-    type AssignmentOperator = SyntaxKind.EqualsToken | CompoundAssignmentOperator;
-    type AssignmentOperatorOrHigher = LogicalOperatorOrHigher | AssignmentOperator;
-    type BinaryOperator = AssignmentOperatorOrHigher | SyntaxKind.CommaToken;
-    type BinaryOperatorToken = Token<BinaryOperator>;
-    interface BinaryExpression extends Expression, Declaration {
-        kind: SyntaxKind.BinaryExpression;
-        left: Expression;
-        operatorToken: BinaryOperatorToken;
-        right: Expression;
-    }
-    type AssignmentOperatorToken = Token<AssignmentOperator>;
-    interface AssignmentExpression<TOperator extends AssignmentOperatorToken> extends BinaryExpression {
-        left: LeftHandSideExpression;
-        operatorToken: TOperator;
-    }
-    interface ObjectDestructuringAssignment extends AssignmentExpression<EqualsToken> {
-        left: ObjectLiteralExpression;
-    }
-    interface ArrayDestructuringAssignment extends AssignmentExpression<EqualsToken> {
-        left: ArrayLiteralExpression;
-    }
-    type DestructuringAssignment = ObjectDestructuringAssignment | ArrayDestructuringAssignment;
-    type BindingOrAssignmentElement = VariableDeclaration | ParameterDeclaration | BindingElement | PropertyAssignment | ShorthandPropertyAssignment | SpreadAssignment | OmittedExpression | SpreadElement | ArrayLiteralExpression | ObjectLiteralExpression | AssignmentExpression<EqualsToken> | Identifier | PropertyAccessExpression | ElementAccessExpression;
-    type BindingOrAssignmentElementRestIndicator = DotDotDotToken | SpreadElement | SpreadAssignment;
-    type BindingOrAssignmentElementTarget = BindingOrAssignmentPattern | Identifier | PropertyAccessExpression | ElementAccessExpression | OmittedExpression;
-    type ObjectBindingOrAssignmentPattern = ObjectBindingPattern | ObjectLiteralExpression;
-    type ArrayBindingOrAssignmentPattern = ArrayBindingPattern | ArrayLiteralExpression;
-    type AssignmentPattern = ObjectLiteralExpression | ArrayLiteralExpression;
-    type BindingOrAssignmentPattern = ObjectBindingOrAssignmentPattern | ArrayBindingOrAssignmentPattern;
-    interface ConditionalExpression extends Expression {
-        kind: SyntaxKind.ConditionalExpression;
-        condition: Expression;
-        questionToken: QuestionToken;
-        whenTrue: Expression;
-        colonToken: ColonToken;
-        whenFalse: Expression;
-    }
-    type FunctionBody = Block;
-    type ConciseBody = FunctionBody | Expression;
-    interface FunctionExpression extends PrimaryExpression, FunctionLikeDeclarationBase, JSDocContainer {
-        kind: SyntaxKind.FunctionExpression;
-        name?: Identifier;
-        body: FunctionBody;
-    }
-    interface ArrowFunction extends Expression, FunctionLikeDeclarationBase, JSDocContainer {
-        kind: SyntaxKind.ArrowFunction;
-        equalsGreaterThanToken: EqualsGreaterThanToken;
-        body: ConciseBody;
-        name: never;
-    }
-    interface LiteralLikeNode extends Node {
-        text: string;
-        isUnterminated?: boolean;
-        hasExtendedUnicodeEscape?: boolean;
-    }
-    interface LiteralExpression extends LiteralLikeNode, PrimaryExpression {
-        _literalExpressionBrand: any;
-    }
-    interface RegularExpressionLiteral extends LiteralExpression {
-        kind: SyntaxKind.RegularExpressionLiteral;
-    }
-    interface NoSubstitutionTemplateLiteral extends LiteralExpression {
-        kind: SyntaxKind.NoSubstitutionTemplateLiteral;
-    }
-    enum TokenFlags {
-        None = 0,
-        PrecedingLineBreak = 1,
-        PrecedingJSDocComment = 2,
-        Unterminated = 4,
-        ExtendedUnicodeEscape = 8,
-        Scientific = 16,
-        Octal = 32,
-        HexSpecifier = 64,
-        BinarySpecifier = 128,
-        OctalSpecifier = 256,
-        ContainsSeparator = 512,
-        BinaryOrOctalSpecifier = 384,
-        NumericLiteralFlags = 1008
-    }
-    interface NumericLiteral extends LiteralExpression {
-        kind: SyntaxKind.NumericLiteral;
-        numericLiteralFlags: TokenFlags;
-    }
-    interface TemplateHead extends LiteralLikeNode {
-        kind: SyntaxKind.TemplateHead;
-        parent: TemplateExpression;
-    }
-    interface TemplateMiddle extends LiteralLikeNode {
-        kind: SyntaxKind.TemplateMiddle;
-        parent: TemplateSpan;
-    }
-    interface TemplateTail extends LiteralLikeNode {
-        kind: SyntaxKind.TemplateTail;
-        parent: TemplateSpan;
-    }
-    type TemplateLiteral = TemplateExpression | NoSubstitutionTemplateLiteral;
-    interface TemplateExpression extends PrimaryExpression {
-        kind: SyntaxKind.TemplateExpression;
-        head: TemplateHead;
-        templateSpans: NodeArray<TemplateSpan>;
-    }
-    interface TemplateSpan extends Node {
-        kind: SyntaxKind.TemplateSpan;
-        parent: TemplateExpression;
-        expression: Expression;
-        literal: TemplateMiddle | TemplateTail;
-    }
-    interface ParenthesizedExpression extends PrimaryExpression, JSDocContainer {
-        kind: SyntaxKind.ParenthesizedExpression;
-        expression: Expression;
-    }
-    interface ArrayLiteralExpression extends PrimaryExpression {
-        kind: SyntaxKind.ArrayLiteralExpression;
-        elements: NodeArray<Expression>;
-        multiLine?: boolean;
-    }
-    interface SpreadElement extends Expression {
-        kind: SyntaxKind.SpreadElement;
-        parent: ArrayLiteralExpression | CallExpression | NewExpression;
-        expression: Expression;
-    }
-    /**
-     * This interface is a base interface for ObjectLiteralExpression and JSXAttributes to extend from. JSXAttributes is similar to
-     * ObjectLiteralExpression in that it contains array of properties; however, JSXAttributes' properties can only be
-     * JSXAttribute or JSXSpreadAttribute. ObjectLiteralExpression, on the other hand, can only have properties of type
-     * ObjectLiteralElement (e.g. PropertyAssignment, ShorthandPropertyAssignment etc.)
-     */
-    interface ObjectLiteralExpressionBase<T extends ObjectLiteralElement> extends PrimaryExpression, Declaration {
-        properties: NodeArray<T>;
-    }
-    interface ObjectLiteralExpression extends ObjectLiteralExpressionBase<ObjectLiteralElementLike> {
-        kind: SyntaxKind.ObjectLiteralExpression;
-        multiLine?: boolean;
-    }
-    type EntityNameExpression = Identifier | PropertyAccessEntityNameExpression;
-    type EntityNameOrEntityNameExpression = EntityName | EntityNameExpression;
-    interface PropertyAccessExpression extends MemberExpression, NamedDeclaration {
-        kind: SyntaxKind.PropertyAccessExpression;
-        expression: LeftHandSideExpression;
-        name: Identifier;
-    }
-    interface SuperPropertyAccessExpression extends PropertyAccessExpression {
-        expression: SuperExpression;
-    }
-    /** Brand for a PropertyAccessExpression which, like a QualifiedName, consists of a sequence of identifiers separated by dots. */
-    interface PropertyAccessEntityNameExpression extends PropertyAccessExpression {
-        _propertyAccessExpressionLikeQualifiedNameBrand?: any;
-        expression: EntityNameExpression;
-    }
-    interface ElementAccessExpression extends MemberExpression {
-        kind: SyntaxKind.ElementAccessExpression;
-        expression: LeftHandSideExpression;
-        argumentExpression: Expression;
-    }
-    interface SuperElementAccessExpression extends ElementAccessExpression {
-        expression: SuperExpression;
-    }
-    type SuperProperty = SuperPropertyAccessExpression | SuperElementAccessExpression;
-    interface CallExpression extends LeftHandSideExpression, Declaration {
-        kind: SyntaxKind.CallExpression;
-        expression: LeftHandSideExpression;
-        typeArguments?: NodeArray<TypeNode>;
-        arguments: NodeArray<Expression>;
-    }
-    interface SuperCall extends CallExpression {
-        expression: SuperExpression;
-    }
-    interface ImportCall extends CallExpression {
-        expression: ImportExpression;
-    }
-    interface ExpressionWithTypeArguments extends NodeWithTypeArguments {
-        kind: SyntaxKind.ExpressionWithTypeArguments;
-        parent: HeritageClause;
-        expression: LeftHandSideExpression;
-    }
-    interface NewExpression extends PrimaryExpression, Declaration {
-        kind: SyntaxKind.NewExpression;
-        expression: LeftHandSideExpression;
-        typeArguments?: NodeArray<TypeNode>;
-        arguments?: NodeArray<Expression>;
-    }
-    interface TaggedTemplateExpression extends MemberExpression {
-        kind: SyntaxKind.TaggedTemplateExpression;
-        tag: LeftHandSideExpression;
-        typeArguments?: NodeArray<TypeNode>;
-        template: TemplateLiteral;
-    }
-    type CallLikeExpression = CallExpression | NewExpression | TaggedTemplateExpression | Decorator | JsxOpeningLikeElement;
-    interface AsExpression extends Expression {
-        kind: SyntaxKind.AsExpression;
-        expression: Expression;
-        type: TypeNode;
-    }
-    interface TypeAssertion extends UnaryExpression {
-        kind: SyntaxKind.TypeAssertionExpression;
-        type: TypeNode;
-        expression: UnaryExpression;
-    }
-    type AssertionExpression = TypeAssertion | AsExpression;
-    interface NonNullExpression extends LeftHandSideExpression {
-        kind: SyntaxKind.NonNullExpression;
-        expression: Expression;
-    }
-    interface MetaProperty extends PrimaryExpression {
-        kind: SyntaxKind.MetaProperty;
-        keywordToken: SyntaxKind.NewKeyword | SyntaxKind.ImportKeyword;
-        name: Identifier;
-    }
-    interface JsxElement extends PrimaryExpression {
-        kind: SyntaxKind.JsxElement;
-        openingElement: JsxOpeningElement;
-        children: NodeArray<JsxChild>;
-        closingElement: JsxClosingElement;
-    }
-    type JsxOpeningLikeElement = JsxSelfClosingElement | JsxOpeningElement;
-    type JsxAttributeLike = JsxAttribute | JsxSpreadAttribute;
-    type JsxTagNameExpression = PrimaryExpression | PropertyAccessExpression;
-    interface JsxAttributes extends ObjectLiteralExpressionBase<JsxAttributeLike> {
-        parent: JsxOpeningLikeElement;
-    }
-    interface JsxOpeningElement extends Expression {
-        kind: SyntaxKind.JsxOpeningElement;
-        parent: JsxElement;
-        tagName: JsxTagNameExpression;
-        typeArguments?: NodeArray<TypeNode>;
-        attributes: JsxAttributes;
-    }
-    interface JsxSelfClosingElement extends PrimaryExpression {
-        kind: SyntaxKind.JsxSelfClosingElement;
-        tagName: JsxTagNameExpression;
-        typeArguments?: NodeArray<TypeNode>;
-        attributes: JsxAttributes;
-    }
-    interface JsxFragment extends PrimaryExpression {
-        kind: SyntaxKind.JsxFragment;
-        openingFragment: JsxOpeningFragment;
-        children: NodeArray<JsxChild>;
-        closingFragment: JsxClosingFragment;
-    }
-    interface JsxOpeningFragment extends Expression {
-        kind: SyntaxKind.JsxOpeningFragment;
-        parent: JsxFragment;
-    }
-    interface JsxClosingFragment extends Expression {
-        kind: SyntaxKind.JsxClosingFragment;
-        parent: JsxFragment;
-    }
-    interface JsxAttribute extends ObjectLiteralElement {
-        kind: SyntaxKind.JsxAttribute;
-        parent: JsxAttributes;
-        name: Identifier;
-        initializer?: StringLiteral | JsxExpression;
-    }
-    interface JsxSpreadAttribute extends ObjectLiteralElement {
-        kind: SyntaxKind.JsxSpreadAttribute;
-        parent: JsxAttributes;
-        expression: Expression;
-    }
-    interface JsxClosingElement extends Node {
-        kind: SyntaxKind.JsxClosingElement;
-        parent: JsxElement;
-        tagName: JsxTagNameExpression;
-    }
-    interface JsxExpression extends Expression {
-        kind: SyntaxKind.JsxExpression;
-        parent: JsxElement | JsxAttributeLike;
-        dotDotDotToken?: Token<SyntaxKind.DotDotDotToken>;
-        expression?: Expression;
-    }
-    interface JsxText extends Node {
-        kind: SyntaxKind.JsxText;
-        containsOnlyWhiteSpaces: boolean;
-        parent: JsxElement;
-    }
-    type JsxChild = JsxText | JsxExpression | JsxElement | JsxSelfClosingElement | JsxFragment;
-    interface Statement extends Node {
-        _statementBrand: any;
-    }
-    interface NotEmittedStatement extends Statement {
-        kind: SyntaxKind.NotEmittedStatement;
-    }
-    /**
-     * Marks the end of transformed declaration to properly emit exports.
-     */
-    interface EndOfDeclarationMarker extends Statement {
-        kind: SyntaxKind.EndOfDeclarationMarker;
-    }
-    /**
-     * A list of comma-separated expressions. This node is only created by transformations.
-     */
-    interface CommaListExpression extends Expression {
-        kind: SyntaxKind.CommaListExpression;
-        elements: NodeArray<Expression>;
-    }
-    /**
-     * Marks the beginning of a merged transformed declaration.
-     */
-    interface MergeDeclarationMarker extends Statement {
-        kind: SyntaxKind.MergeDeclarationMarker;
-    }
-    interface EmptyStatement extends Statement {
-        kind: SyntaxKind.EmptyStatement;
-    }
-    interface DebuggerStatement extends Statement {
-        kind: SyntaxKind.DebuggerStatement;
-    }
-    interface MissingDeclaration extends DeclarationStatement {
-        kind: SyntaxKind.MissingDeclaration;
-        name?: Identifier;
-    }
-    type BlockLike = SourceFile | Block | ModuleBlock | CaseOrDefaultClause;
-    interface Block extends Statement {
-        kind: SyntaxKind.Block;
-        statements: NodeArray<Statement>;
-        multiLine?: boolean;
-    }
-    interface VariableStatement extends Statement, JSDocContainer {
-        kind: SyntaxKind.VariableStatement;
-        declarationList: VariableDeclarationList;
-    }
-    interface ExpressionStatement extends Statement, JSDocContainer {
-        kind: SyntaxKind.ExpressionStatement;
-        expression: Expression;
-    }
-    interface PrologueDirective extends ExpressionStatement {
-        expression: StringLiteral;
-    }
-    interface IfStatement extends Statement {
-        kind: SyntaxKind.IfStatement;
-        expression: Expression;
-        thenStatement: Statement;
-        elseStatement?: Statement;
-    }
-    interface IterationStatement extends Statement {
-        statement: Statement;
-    }
-    interface DoStatement extends IterationStatement {
-        kind: SyntaxKind.DoStatement;
-        expression: Expression;
-    }
-    interface WhileStatement extends IterationStatement {
-        kind: SyntaxKind.WhileStatement;
-        expression: Expression;
-    }
-    type ForInitializer = VariableDeclarationList | Expression;
-    interface ForStatement extends IterationStatement {
-        kind: SyntaxKind.ForStatement;
-        initializer?: ForInitializer;
-        condition?: Expression;
-        incrementor?: Expression;
-    }
-    type ForInOrOfStatement = ForInStatement | ForOfStatement;
-    interface ForInStatement extends IterationStatement {
-        kind: SyntaxKind.ForInStatement;
-        initializer: ForInitializer;
-        expression: Expression;
-    }
-    interface ForOfStatement extends IterationStatement {
-        kind: SyntaxKind.ForOfStatement;
-        awaitModifier?: AwaitKeywordToken;
-        initializer: ForInitializer;
-        expression: Expression;
-    }
-    interface BreakStatement extends Statement {
-        kind: SyntaxKind.BreakStatement;
-        label?: Identifier;
-    }
-    interface ContinueStatement extends Statement {
-        kind: SyntaxKind.ContinueStatement;
-        label?: Identifier;
-    }
-    type BreakOrContinueStatement = BreakStatement | ContinueStatement;
-    interface ReturnStatement extends Statement {
-        kind: SyntaxKind.ReturnStatement;
-        expression?: Expression;
-    }
-    interface WithStatement extends Statement {
-        kind: SyntaxKind.WithStatement;
-        expression: Expression;
-        statement: Statement;
-    }
-    interface SwitchStatement extends Statement {
-        kind: SyntaxKind.SwitchStatement;
-        expression: Expression;
-        caseBlock: CaseBlock;
-        possiblyExhaustive?: boolean;
-    }
-    interface CaseBlock extends Node {
-        kind: SyntaxKind.CaseBlock;
-        parent: SwitchStatement;
-        clauses: NodeArray<CaseOrDefaultClause>;
-    }
-    interface CaseClause extends Node {
-        kind: SyntaxKind.CaseClause;
-        parent: CaseBlock;
-        expression: Expression;
-        statements: NodeArray<Statement>;
-    }
-    interface DefaultClause extends Node {
-        kind: SyntaxKind.DefaultClause;
-        parent: CaseBlock;
-        statements: NodeArray<Statement>;
-    }
-    type CaseOrDefaultClause = CaseClause | DefaultClause;
-    interface LabeledStatement extends Statement, JSDocContainer {
-        kind: SyntaxKind.LabeledStatement;
-        label: Identifier;
-        statement: Statement;
-    }
-    interface ThrowStatement extends Statement {
-        kind: SyntaxKind.ThrowStatement;
-        expression?: Expression;
-    }
-    interface TryStatement extends Statement {
-        kind: SyntaxKind.TryStatement;
-        tryBlock: Block;
-        catchClause?: CatchClause;
-        finallyBlock?: Block;
-    }
-    interface CatchClause extends Node {
-        kind: SyntaxKind.CatchClause;
-        parent: TryStatement;
-        variableDeclaration?: VariableDeclaration;
-        block: Block;
-    }
-    type ObjectTypeDeclaration = ClassLikeDeclaration | InterfaceDeclaration | TypeLiteralNode;
-    type DeclarationWithTypeParameters = SignatureDeclaration | ClassLikeDeclaration | InterfaceDeclaration | TypeAliasDeclaration | JSDocTemplateTag | JSDocTypedefTag | JSDocCallbackTag | JSDocSignature;
-    interface ClassLikeDeclarationBase extends NamedDeclaration, JSDocContainer {
-        kind: SyntaxKind.ClassDeclaration | SyntaxKind.ClassExpression;
-        name?: Identifier;
-        typeParameters?: NodeArray<TypeParameterDeclaration>;
-        heritageClauses?: NodeArray<HeritageClause>;
-        members: NodeArray<ClassElement>;
-    }
-    interface ClassDeclaration extends ClassLikeDeclarationBase, DeclarationStatement {
-        kind: SyntaxKind.ClassDeclaration;
-        /** May be undefined in `export default class { ... }`. */
-        name?: Identifier;
-    }
-    interface ClassExpression extends ClassLikeDeclarationBase, PrimaryExpression {
-        kind: SyntaxKind.ClassExpression;
-    }
-    type ClassLikeDeclaration = ClassDeclaration | ClassExpression;
-    interface ClassElement extends NamedDeclaration {
-        _classElementBrand: any;
-        name?: PropertyName;
-    }
-    interface TypeElement extends NamedDeclaration {
-        _typeElementBrand: any;
-        name?: PropertyName;
-        questionToken?: QuestionToken;
-    }
-    interface InterfaceDeclaration extends DeclarationStatement, JSDocContainer {
-        kind: SyntaxKind.InterfaceDeclaration;
-        name: Identifier;
-        typeParameters?: NodeArray<TypeParameterDeclaration>;
-        heritageClauses?: NodeArray<HeritageClause>;
-        members: NodeArray<TypeElement>;
-    }
-    interface HeritageClause extends Node {
-        kind: SyntaxKind.HeritageClause;
-        parent: InterfaceDeclaration | ClassLikeDeclaration;
-        token: SyntaxKind.ExtendsKeyword | SyntaxKind.ImplementsKeyword;
-        types: NodeArray<ExpressionWithTypeArguments>;
-    }
-    interface TypeAliasDeclaration extends DeclarationStatement, JSDocContainer {
-        kind: SyntaxKind.TypeAliasDeclaration;
-        name: Identifier;
-        typeParameters?: NodeArray<TypeParameterDeclaration>;
-        type: TypeNode;
-    }
-    interface EnumMember extends NamedDeclaration, JSDocContainer {
-        kind: SyntaxKind.EnumMember;
-        parent: EnumDeclaration;
-        name: PropertyName;
-        initializer?: Expression;
-    }
-    interface EnumDeclaration extends DeclarationStatement, JSDocContainer {
-        kind: SyntaxKind.EnumDeclaration;
-        name: Identifier;
-        members: NodeArray<EnumMember>;
-    }
-    type ModuleName = Identifier | StringLiteral;
-    type ModuleBody = NamespaceBody | JSDocNamespaceBody;
-    interface AmbientModuleDeclaration extends ModuleDeclaration {
-        body?: ModuleBlock;
-    }
-    interface ModuleDeclaration extends DeclarationStatement, JSDocContainer {
-        kind: SyntaxKind.ModuleDeclaration;
-        parent: ModuleBody | SourceFile;
-        name: ModuleName;
-        body?: ModuleBody | JSDocNamespaceDeclaration;
-    }
-    type NamespaceBody = ModuleBlock | NamespaceDeclaration;
-    interface NamespaceDeclaration extends ModuleDeclaration {
-        name: Identifier;
-        body: NamespaceBody;
-    }
-    type JSDocNamespaceBody = Identifier | JSDocNamespaceDeclaration;
-    interface JSDocNamespaceDeclaration extends ModuleDeclaration {
-        name: Identifier;
-        body?: JSDocNamespaceBody;
-    }
-    interface ModuleBlock extends Node, Statement {
-        kind: SyntaxKind.ModuleBlock;
-        parent: ModuleDeclaration;
-        statements: NodeArray<Statement>;
-    }
-    type ModuleReference = EntityName | ExternalModuleReference;
-    /**
-     * One of:
-     * - import x = require("mod");
-     * - import x = M.x;
-     */
-    interface ImportEqualsDeclaration extends DeclarationStatement, JSDocContainer {
-        kind: SyntaxKind.ImportEqualsDeclaration;
-        parent: SourceFile | ModuleBlock;
-        name: Identifier;
-        moduleReference: ModuleReference;
-    }
-    interface ExternalModuleReference extends Node {
-        kind: SyntaxKind.ExternalModuleReference;
-        parent: ImportEqualsDeclaration;
-        expression: Expression;
-    }
-    interface ImportDeclaration extends Statement {
-        kind: SyntaxKind.ImportDeclaration;
-        parent: SourceFile | ModuleBlock;
-        importClause?: ImportClause;
-        /** If this is not a StringLiteral it will be a grammar error. */
-        moduleSpecifier: Expression;
-    }
-    type NamedImportBindings = NamespaceImport | NamedImports;
-    interface ImportClause extends NamedDeclaration {
-        kind: SyntaxKind.ImportClause;
-        parent: ImportDeclaration;
-        name?: Identifier;
-        namedBindings?: NamedImportBindings;
-    }
-    interface NamespaceImport extends NamedDeclaration {
-        kind: SyntaxKind.NamespaceImport;
-        parent: ImportClause;
-        name: Identifier;
-    }
-    interface NamespaceExportDeclaration extends DeclarationStatement {
-        kind: SyntaxKind.NamespaceExportDeclaration;
-        name: Identifier;
-    }
-    interface ExportDeclaration extends DeclarationStatement {
-        kind: SyntaxKind.ExportDeclaration;
-        parent: SourceFile | ModuleBlock;
-        /** Will not be assigned in the case of `export * from "foo";` */
-        exportClause?: NamedExports;
-        /** If this is not a StringLiteral it will be a grammar error. */
-        moduleSpecifier?: Expression;
-    }
-    interface NamedImports extends Node {
-        kind: SyntaxKind.NamedImports;
-        parent: ImportClause;
-        elements: NodeArray<ImportSpecifier>;
-    }
-    interface NamedExports extends Node {
-        kind: SyntaxKind.NamedExports;
-        parent: ExportDeclaration;
-        elements: NodeArray<ExportSpecifier>;
-    }
-    type NamedImportsOrExports = NamedImports | NamedExports;
-    interface ImportSpecifier extends NamedDeclaration {
-        kind: SyntaxKind.ImportSpecifier;
-        parent: NamedImports;
-        propertyName?: Identifier;
-        name: Identifier;
-    }
-    interface ExportSpecifier extends NamedDeclaration {
-        kind: SyntaxKind.ExportSpecifier;
-        parent: NamedExports;
-        propertyName?: Identifier;
-        name: Identifier;
-    }
-    type ImportOrExportSpecifier = ImportSpecifier | ExportSpecifier;
-    /**
-     * This is either an `export =` or an `export default` declaration.
-     * Unless `isExportEquals` is set, this node was parsed as an `export default`.
-     */
-    interface ExportAssignment extends DeclarationStatement {
-        kind: SyntaxKind.ExportAssignment;
-        parent: SourceFile;
-        isExportEquals?: boolean;
-        expression: Expression;
-    }
-    interface FileReference extends TextRange {
-        fileName: string;
-    }
-    interface CheckJsDirective extends TextRange {
-        enabled: boolean;
-    }
-    type CommentKind = SyntaxKind.SingleLineCommentTrivia | SyntaxKind.MultiLineCommentTrivia;
-    interface CommentRange extends TextRange {
-        hasTrailingNewLine?: boolean;
-        kind: CommentKind;
-    }
-    interface SynthesizedComment extends CommentRange {
-        text: string;
-        pos: -1;
-        end: -1;
-    }
-    interface JSDocTypeExpression extends TypeNode {
-        kind: SyntaxKind.JSDocTypeExpression;
-        type: TypeNode;
-    }
-    interface JSDocType extends TypeNode {
-        _jsDocTypeBrand: any;
-    }
-    interface JSDocAllType extends JSDocType {
-        kind: SyntaxKind.JSDocAllType;
-    }
-    interface JSDocUnknownType extends JSDocType {
-        kind: SyntaxKind.JSDocUnknownType;
-    }
-    interface JSDocNonNullableType extends JSDocType {
-        kind: SyntaxKind.JSDocNonNullableType;
-        type: TypeNode;
-    }
-    interface JSDocNullableType extends JSDocType {
-        kind: SyntaxKind.JSDocNullableType;
-        type: TypeNode;
-    }
-    interface JSDocOptionalType extends JSDocType {
-        kind: SyntaxKind.JSDocOptionalType;
-        type: TypeNode;
-    }
-    interface JSDocFunctionType extends JSDocType, SignatureDeclarationBase {
-        kind: SyntaxKind.JSDocFunctionType;
-    }
-    interface JSDocVariadicType extends JSDocType {
-        kind: SyntaxKind.JSDocVariadicType;
-        type: TypeNode;
-    }
-    type JSDocTypeReferencingNode = JSDocVariadicType | JSDocOptionalType | JSDocNullableType | JSDocNonNullableType;
-    interface JSDoc extends Node {
-        kind: SyntaxKind.JSDocComment;
-        parent: HasJSDoc;
-        tags?: NodeArray<JSDocTag>;
-        comment?: string;
-    }
-    interface JSDocTag extends Node {
-        parent: JSDoc | JSDocTypeLiteral;
-        atToken: AtToken;
-        tagName: Identifier;
-        comment?: string;
-    }
-    interface JSDocUnknownTag extends JSDocTag {
-        kind: SyntaxKind.JSDocTag;
-    }
-    /**
-     * Note that `@extends` is a synonym of `@augments`.
-     * Both tags are represented by this interface.
-     */
-    interface JSDocAugmentsTag extends JSDocTag {
-        kind: SyntaxKind.JSDocAugmentsTag;
-        class: ExpressionWithTypeArguments & {
-            expression: Identifier | PropertyAccessEntityNameExpression;
-        };
-    }
-    interface JSDocClassTag extends JSDocTag {
-        kind: SyntaxKind.JSDocClassTag;
-    }
-    interface JSDocTemplateTag extends JSDocTag {
-        kind: SyntaxKind.JSDocTemplateTag;
-        typeParameters: NodeArray<TypeParameterDeclaration>;
-    }
-    interface JSDocReturnTag extends JSDocTag {
-        kind: SyntaxKind.JSDocReturnTag;
-        typeExpression?: JSDocTypeExpression;
-    }
-    interface JSDocTypeTag extends JSDocTag {
-        kind: SyntaxKind.JSDocTypeTag;
-        typeExpression?: JSDocTypeExpression;
-    }
-    interface JSDocTypedefTag extends JSDocTag, NamedDeclaration {
-        parent: JSDoc;
-        kind: SyntaxKind.JSDocTypedefTag;
-        fullName?: JSDocNamespaceDeclaration | Identifier;
-        name?: Identifier;
-        typeExpression?: JSDocTypeExpression | JSDocTypeLiteral;
-    }
-    interface JSDocCallbackTag extends JSDocTag, NamedDeclaration {
-        parent: JSDoc;
-        kind: SyntaxKind.JSDocCallbackTag;
-        fullName?: JSDocNamespaceDeclaration | Identifier;
-        name?: Identifier;
-        typeExpression: JSDocSignature;
-    }
-    interface JSDocSignature extends JSDocType, Declaration {
-        kind: SyntaxKind.JSDocSignature;
-        typeParameters?: ReadonlyArray<JSDocTemplateTag>;
-        parameters: ReadonlyArray<JSDocParameterTag>;
-        type: JSDocReturnTag | undefined;
-    }
-    interface JSDocPropertyLikeTag extends JSDocTag, Declaration {
-        parent: JSDoc;
-        name: EntityName;
-        typeExpression?: JSDocTypeExpression;
-        /** Whether the property name came before the type -- non-standard for JSDoc, but Typescript-like */
-        isNameFirst: boolean;
-        isBracketed: boolean;
-    }
-    interface JSDocPropertyTag extends JSDocPropertyLikeTag {
-        kind: SyntaxKind.JSDocPropertyTag;
-    }
-    interface JSDocParameterTag extends JSDocPropertyLikeTag {
-        kind: SyntaxKind.JSDocParameterTag;
-    }
-    interface JSDocTypeLiteral extends JSDocType {
-        kind: SyntaxKind.JSDocTypeLiteral;
-        jsDocPropertyTags?: ReadonlyArray<JSDocPropertyLikeTag>;
-        /** If true, then this type literal represents an *array* of its type. */
-        isArrayType?: boolean;
-    }
-    enum FlowFlags {
-        Unreachable = 1,
-        Start = 2,
-        BranchLabel = 4,
-        LoopLabel = 8,
-        Assignment = 16,
-        TrueCondition = 32,
-        FalseCondition = 64,
-        SwitchClause = 128,
-        ArrayMutation = 256,
-        Referenced = 512,
-        Shared = 1024,
-        PreFinally = 2048,
-        AfterFinally = 4096,
-        Label = 12,
-        Condition = 96
-    }
-    interface FlowLock {
-        locked?: boolean;
-    }
-    interface AfterFinallyFlow extends FlowNodeBase, FlowLock {
-        antecedent: FlowNode;
-    }
-    interface PreFinallyFlow extends FlowNodeBase {
-        antecedent: FlowNode;
-        lock: FlowLock;
-    }
-    type FlowNode = AfterFinallyFlow | PreFinallyFlow | FlowStart | FlowLabel | FlowAssignment | FlowCondition | FlowSwitchClause | FlowArrayMutation;
-    interface FlowNodeBase {
-        flags: FlowFlags;
-        id?: number;
-    }
-    interface FlowStart extends FlowNodeBase {
-        container?: FunctionExpression | ArrowFunction | MethodDeclaration;
-    }
-    interface FlowLabel extends FlowNodeBase {
-        antecedents: FlowNode[] | undefined;
-    }
-    interface FlowAssignment extends FlowNodeBase {
-        node: Expression | VariableDeclaration | BindingElement;
-        antecedent: FlowNode;
-    }
-    interface FlowCondition extends FlowNodeBase {
-        expression: Expression;
-        antecedent: FlowNode;
-    }
-    interface FlowSwitchClause extends FlowNodeBase {
-        switchStatement: SwitchStatement;
-        clauseStart: number;
-        clauseEnd: number;
-        antecedent: FlowNode;
-    }
-    interface FlowArrayMutation extends FlowNodeBase {
-        node: CallExpression | BinaryExpression;
-        antecedent: FlowNode;
-    }
-    type FlowType = Type | IncompleteType;
-    interface IncompleteType {
-        flags: TypeFlags;
-        type: Type;
-    }
-    interface AmdDependency {
-        path: string;
-        name?: string;
-    }
-    /**
-     * Subset of properties from SourceFile that are used in multiple utility functions
-     */
-    interface SourceFileLike {
-        readonly text: string;
-        lineMap?: ReadonlyArray<number>;
-    }
-    interface RedirectInfo {
-        /** Source file this redirects to. */
-        readonly redirectTarget: SourceFile;
-        /**
-         * Source file for the duplicate package. This will not be used by the Program,
-         * but we need to keep this around so we can watch for changes in underlying.
-         */
-        readonly unredirected: SourceFile;
-    }
-    interface SourceFile extends Declaration {
-        kind: SyntaxKind.SourceFile;
-        statements: NodeArray<Statement>;
-        endOfFileToken: Token<SyntaxKind.EndOfFileToken>;
-        fileName: string;
-        path: Path;
-        text: string;
-        resolvedPath: Path;
-        /**
-         * If two source files are for the same version of the same package, one will redirect to the other.
-         * (See `createRedirectSourceFile` in program.ts.)
-         * The redirect will have this set. The redirected-to source file will be in `redirectTargetsSet`.
-         */
-        redirectInfo?: RedirectInfo;
-        amdDependencies: ReadonlyArray<AmdDependency>;
-        moduleName?: string;
-        referencedFiles: ReadonlyArray<FileReference>;
-        typeReferenceDirectives: ReadonlyArray<FileReference>;
-        libReferenceDirectives: ReadonlyArray<FileReference>;
-        languageVariant: LanguageVariant;
-        isDeclarationFile: boolean;
-        renamedDependencies?: ReadonlyMap<string>;
-        /**
-         * lib.d.ts should have a reference comment like
-         *
-         *  /// <reference no-default-lib="true"/>
-         *
-         * If any other file has this comment, it signals not to include lib.d.ts
-         * because this containing file is intended to act as a default library.
-         */
-        hasNoDefaultLib: boolean;
-        languageVersion: ScriptTarget;
-        scriptKind: ScriptKind;
-        /**
-         * The first "most obvious" node that makes a file an external module.
-         * This is intended to be the first top-level import/export,
-         * but could be arbitrarily nested (e.g. `import.meta`).
-         */
-        externalModuleIndicator?: Node;
-        commonJsModuleIndicator?: Node;
-        identifiers: Map<string>;
-        nodeCount: number;
-        identifierCount: number;
-        symbolCount: number;
-        parseDiagnostics: DiagnosticWithLocation[];
-        bindDiagnostics: DiagnosticWithLocation[];
-        bindSuggestionDiagnostics?: DiagnosticWithLocation[];
-        jsDocDiagnostics?: DiagnosticWithLocation[];
-        additionalSyntacticDiagnostics?: ReadonlyArray<DiagnosticWithLocation>;
-        lineMap: ReadonlyArray<number>;
-        classifiableNames?: ReadonlyUnderscoreEscapedMap<true>;
-        resolvedModules?: Map<ResolvedModuleFull | undefined>;
-        resolvedTypeReferenceDirectiveNames: Map<ResolvedTypeReferenceDirective>;
-        imports: ReadonlyArray<StringLiteralLike>;
-        /**
-         * When a file's references are redirected due to project reference directives,
-         * the original names of the references are stored in this array
-         */
-        redirectedReferences?: ReadonlyArray<string>;
-        moduleAugmentations: ReadonlyArray<StringLiteral | Identifier>;
-        patternAmbientModules?: PatternAmbientModule[];
-        ambientModuleNames: ReadonlyArray<string>;
-        checkJsDirective?: CheckJsDirective;
-        version: string;
-        pragmas: PragmaMap;
-        localJsxNamespace?: __String;
-        localJsxFactory?: EntityName;
-    }
-    interface Bundle extends Node {
-        kind: SyntaxKind.Bundle;
-        prepends: ReadonlyArray<InputFiles | UnparsedSource>;
-        sourceFiles: ReadonlyArray<SourceFile>;
-        syntheticFileReferences?: ReadonlyArray<FileReference>;
-        syntheticTypeReferences?: ReadonlyArray<FileReference>;
-        hasNoDefaultLib?: boolean;
-    }
-    interface InputFiles extends Node {
-        kind: SyntaxKind.InputFiles;
-        javascriptText: string;
-        javascriptMapText?: string;
-        declarationText: string;
-        declarationMapText?: string;
-    }
-    interface UnparsedSource extends Node {
-        kind: SyntaxKind.UnparsedSource;
-        text: string;
-        sourceMapText?: string;
-    }
-    interface JsonSourceFile extends SourceFile {
-        statements: NodeArray<JsonObjectExpressionStatement>;
-    }
-    interface TsConfigSourceFile extends JsonSourceFile {
-        extendedSourceFiles?: string[];
-    }
-    interface JsonMinusNumericLiteral extends PrefixUnaryExpression {
-        kind: SyntaxKind.PrefixUnaryExpression;
-        operator: SyntaxKind.MinusToken;
-        operand: NumericLiteral;
-    }
-    interface JsonObjectExpressionStatement extends ExpressionStatement {
-        expression: ObjectLiteralExpression | ArrayLiteralExpression | JsonMinusNumericLiteral | NumericLiteral | StringLiteral | BooleanLiteral | NullLiteral;
-    }
-    interface ScriptReferenceHost {
-        getCompilerOptions(): CompilerOptions;
-        getSourceFile(fileName: string): SourceFile | undefined;
-        getSourceFileByPath(path: Path): SourceFile | undefined;
-        getCurrentDirectory(): string;
-    }
-    interface ParseConfigHost {
-        useCaseSensitiveFileNames: boolean;
-        readDirectory(rootDir: string, extensions: ReadonlyArray<string>, excludes: ReadonlyArray<string> | undefined, includes: ReadonlyArray<string>, depth?: number): string[];
-        /**
-         * Gets a value indicating whether the specified path exists and is a file.
-         * @param path The path to test.
-         */
-        fileExists(path: string): boolean;
-        readFile(path: string): string | undefined;
-    }
-    type WriteFileCallback = (fileName: string, data: string, writeByteOrderMark: boolean, onError: ((message: string) => void) | undefined, sourceFiles?: ReadonlyArray<SourceFile>) => void;
-    class OperationCanceledException {
-    }
-    interface CancellationToken {
-        isCancellationRequested(): boolean;
-        /** @throws OperationCanceledException if isCancellationRequested is true */
-        throwIfCancellationRequested(): void;
-    }
-    interface Program extends ScriptReferenceHost {
-        /**
-         * Get a list of root file names that were passed to a 'createProgram'
-         */
-        getRootFileNames(): ReadonlyArray<string>;
-        /**
-         * Get a list of files in the program
-         */
-        getSourceFiles(): ReadonlyArray<SourceFile>;
-        /**
-         * Get a list of file names that were passed to 'createProgram' or referenced in a
-         * program source file but could not be located.
-         */
-        getMissingFilePaths(): ReadonlyArray<Path>;
-        /**
-         * Emits the JavaScript and declaration files.  If targetSourceFile is not specified, then
-         * the JavaScript and declaration files will be produced for all the files in this program.
-         * If targetSourceFile is specified, then only the JavaScript and declaration for that
-         * specific file will be generated.
-         *
-         * If writeFile is not specified then the writeFile callback from the compiler host will be
-         * used for writing the JavaScript and declaration files.  Otherwise, the writeFile parameter
-         * will be invoked when writing the JavaScript and declaration files.
-         */
-        emit(targetSourceFile?: SourceFile, writeFile?: WriteFileCallback, cancellationToken?: CancellationToken, emitOnlyDtsFiles?: boolean, customTransformers?: CustomTransformers): EmitResult;
-        getOptionsDiagnostics(cancellationToken?: CancellationToken): ReadonlyArray<Diagnostic>;
-        getGlobalDiagnostics(cancellationToken?: CancellationToken): ReadonlyArray<Diagnostic>;
-        getSyntacticDiagnostics(sourceFile?: SourceFile, cancellationToken?: CancellationToken): ReadonlyArray<DiagnosticWithLocation>;
-        /** The first time this is called, it will return global diagnostics (no location). */
-        getSemanticDiagnostics(sourceFile?: SourceFile, cancellationToken?: CancellationToken): ReadonlyArray<Diagnostic>;
-        getDeclarationDiagnostics(sourceFile?: SourceFile, cancellationToken?: CancellationToken): ReadonlyArray<DiagnosticWithLocation>;
-        getConfigFileParsingDiagnostics(): ReadonlyArray<Diagnostic>;
-        getSuggestionDiagnostics(sourceFile: SourceFile, cancellationToken?: CancellationToken): ReadonlyArray<DiagnosticWithLocation>;
-        /**
-         * Gets a type checker that can be used to semantically analyze source files in the program.
-         */
-        getTypeChecker(): TypeChecker;
-        getCommonSourceDirectory(): string;
-        getDiagnosticsProducingTypeChecker(): TypeChecker;
-        dropDiagnosticsProducingTypeChecker(): void;
-        getClassifiableNames(): UnderscoreEscapedMap<true>;
-        getNodeCount(): number;
-        getIdentifierCount(): number;
-        getSymbolCount(): number;
-        getTypeCount(): number;
-        getFileProcessingDiagnostics(): DiagnosticCollection;
-        getResolvedTypeReferenceDirectives(): Map<ResolvedTypeReferenceDirective>;
-        isSourceFileFromExternalLibrary(file: SourceFile): boolean;
-        isSourceFileDefaultLibrary(file: SourceFile): boolean;
-        structureIsReused?: StructureIsReused;
-        getSourceFileFromReference(referencingFile: SourceFile, ref: FileReference): SourceFile | undefined;
-        getLibFileFromReference(ref: FileReference): SourceFile | undefined;
-        /** Given a source file, get the name of the package it was imported from. */
-        sourceFileToPackageName: Map<string>;
-        /** Set of all source files that some other source file redirects to. */
-        redirectTargetsSet: Map<true>;
-        /** Is the file emitted file */
-        isEmittedFile(file: string): boolean;
-        getResolvedModuleWithFailedLookupLocationsFromCache(moduleName: string, containingFile: string): ResolvedModuleWithFailedLookupLocations | undefined;
-        getProjectReferences(): (ResolvedProjectReference | undefined)[] | undefined;
-    }
-    interface ResolvedProjectReference {
-        commandLine: ParsedCommandLine;
-        sourceFile: SourceFile;
-    }
-    enum StructureIsReused {
-        Not = 0,
-        SafeModules = 1,
-        Completely = 2
-    }
-    interface CustomTransformers {
-        /** Custom transformers to evaluate before built-in .js transformations. */
-        before?: TransformerFactory<SourceFile>[];
-        /** Custom transformers to evaluate after built-in .js transformations. */
-        after?: TransformerFactory<SourceFile>[];
-        /** Custom transformers to evaluate after built-in .d.ts transformations. */
-        afterDeclarations?: TransformerFactory<Bundle | SourceFile>[];
-    }
-    interface SourceMapSpan {
-        /** Line number in the .js file. */
-        emittedLine: number;
-        /** Column number in the .js file. */
-        emittedColumn: number;
-        /** Line number in the .ts file. */
-        sourceLine: number;
-        /** Column number in the .ts file. */
-        sourceColumn: number;
-        /** Optional name (index into names array) associated with this span. */
-        nameIndex?: number;
-        /** .ts file (index into sources array) associated with this span */
-        sourceIndex: number;
-    }
-    interface SourceMapData {
-        sourceMapFilePath: string;
-        jsSourceMappingURL: string;
-        sourceMapFile: string;
-        sourceMapSourceRoot: string;
-        sourceMapSources: string[];
-        sourceMapSourcesContent?: string[];
-        inputSourceFileNames: string[];
-        sourceMapNames?: string[];
-        sourceMapMappings: string;
-        sourceMapDecodedMappings: SourceMapSpan[];
-    }
-    /** Return code used by getEmitOutput function to indicate status of the function */
-    enum ExitStatus {
-        Success = 0,
-        DiagnosticsPresent_OutputsSkipped = 1,
-        DiagnosticsPresent_OutputsGenerated = 2
-    }
-    interface EmitResult {
-        emitSkipped: boolean;
-        /** Contains declaration emit diagnostics */
-        diagnostics: ReadonlyArray<Diagnostic>;
-        emittedFiles?: string[];
-        sourceMaps?: SourceMapData[];
-    }
-    interface TypeCheckerHost {
-        getCompilerOptions(): CompilerOptions;
-        getSourceFiles(): ReadonlyArray<SourceFile>;
-        getSourceFile(fileName: string): SourceFile | undefined;
-        getResolvedTypeReferenceDirectives(): ReadonlyMap<ResolvedTypeReferenceDirective>;
-    }
-    interface TypeChecker {
-        getTypeOfSymbolAtLocation(symbol: Symbol, node: Node): Type;
-        getDeclaredTypeOfSymbol(symbol: Symbol): Type;
-        getPropertiesOfType(type: Type): Symbol[];
-        getPropertyOfType(type: Type, propertyName: string): Symbol | undefined;
-        getIndexInfoOfType(type: Type, kind: IndexKind): IndexInfo | undefined;
-        getSignaturesOfType(type: Type, kind: SignatureKind): Signature[];
-        getIndexTypeOfType(type: Type, kind: IndexKind): Type | undefined;
-        getBaseTypes(type: InterfaceType): BaseType[];
-        getBaseTypeOfLiteralType(type: Type): Type;
-        getWidenedType(type: Type): Type;
-        getReturnTypeOfSignature(signature: Signature): Type;
-        /**
-         * Gets the type of a parameter at a given position in a signature.
-         * Returns `any` if the index is not valid.
-         */
-        getParameterType(signature: Signature, parameterIndex: number): Type;
-        getNullableType(type: Type, flags: TypeFlags): Type;
-        getNonNullableType(type: Type): Type;
-        /** Note that the resulting nodes cannot be checked. */
-        typeToTypeNode(type: Type, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): TypeNode | undefined;
-        typeToTypeNode(type: Type, enclosingDeclaration?: Node, flags?: NodeBuilderFlags, tracker?: SymbolTracker): TypeNode | undefined;
-        /** Note that the resulting nodes cannot be checked. */
-        signatureToSignatureDeclaration(signature: Signature, kind: SyntaxKind, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): (SignatureDeclaration & {
-            typeArguments?: NodeArray<TypeNode>;
-        }) | undefined;
-        /** Note that the resulting nodes cannot be checked. */
-        indexInfoToIndexSignatureDeclaration(indexInfo: IndexInfo, kind: IndexKind, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): IndexSignatureDeclaration | undefined;
-        /** Note that the resulting nodes cannot be checked. */
-        symbolToEntityName(symbol: Symbol, meaning: SymbolFlags, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): EntityName | undefined;
-        /** Note that the resulting nodes cannot be checked. */
-        symbolToExpression(symbol: Symbol, meaning: SymbolFlags, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): Expression | undefined;
-        /** Note that the resulting nodes cannot be checked. */
-        symbolToTypeParameterDeclarations(symbol: Symbol, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): NodeArray<TypeParameterDeclaration> | undefined;
-        /** Note that the resulting nodes cannot be checked. */
-        symbolToParameterDeclaration(symbol: Symbol, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): ParameterDeclaration | undefined;
-        /** Note that the resulting nodes cannot be checked. */
-        typeParameterToDeclaration(parameter: TypeParameter, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): TypeParameterDeclaration | undefined;
-        getSymbolsInScope(location: Node, meaning: SymbolFlags): Symbol[];
-        getSymbolAtLocation(node: Node): Symbol | undefined;
-        getSymbolsOfParameterPropertyDeclaration(parameter: ParameterDeclaration, parameterName: string): Symbol[];
-        /**
-         * The function returns the value (local variable) symbol of an identifier in the short-hand property assignment.
-         * This is necessary as an identifier in short-hand property assignment can contains two meaning: property name and property value.
-         */
-        getShorthandAssignmentValueSymbol(location: Node): Symbol | undefined;
-        getExportSpecifierLocalTargetSymbol(location: ExportSpecifier): Symbol | undefined;
-        /**
-         * If a symbol is a local symbol with an associated exported symbol, returns the exported symbol.
-         * Otherwise returns its input.
-         * For example, at `export type T = number;`:
-         *     - `getSymbolAtLocation` at the location `T` will return the exported symbol for `T`.
-         *     - But the result of `getSymbolsInScope` will contain the *local* symbol for `T`, not the exported symbol.
-         *     - Calling `getExportSymbolOfSymbol` on that local symbol will return the exported symbol.
-         */
-        getExportSymbolOfSymbol(symbol: Symbol): Symbol;
-        getPropertySymbolOfDestructuringAssignment(location: Identifier): Symbol | undefined;
-        getTypeAtLocation(node: Node): Type | undefined;
-        getTypeFromTypeNode(node: TypeNode): Type;
-        signatureToString(signature: Signature, enclosingDeclaration?: Node, flags?: TypeFormatFlags, kind?: SignatureKind): string;
-        typeToString(type: Type, enclosingDeclaration?: Node, flags?: TypeFormatFlags): string;
-        symbolToString(symbol: Symbol, enclosingDeclaration?: Node, meaning?: SymbolFlags, flags?: SymbolFormatFlags): string;
-        typePredicateToString(predicate: TypePredicate, enclosingDeclaration?: Node, flags?: TypeFormatFlags): string;
-        writeSignature(signature: Signature, enclosingDeclaration?: Node, flags?: TypeFormatFlags, kind?: SignatureKind, writer?: EmitTextWriter): string;
-        writeType(type: Type, enclosingDeclaration?: Node, flags?: TypeFormatFlags, writer?: EmitTextWriter): string;
-        writeSymbol(symbol: Symbol, enclosingDeclaration?: Node, meaning?: SymbolFlags, flags?: SymbolFormatFlags, writer?: EmitTextWriter): string;
-        writeTypePredicate(predicate: TypePredicate, enclosingDeclaration?: Node, flags?: TypeFormatFlags, writer?: EmitTextWriter): string;
-        /**
-         * @deprecated Use the createX factory functions or XToY typechecker methods and `createPrinter` or the `xToString` methods instead
-         * This will be removed in a future version.
-         */
-        getSymbolDisplayBuilder(): SymbolDisplayBuilder;
-        getFullyQualifiedName(symbol: Symbol): string;
-        getAugmentedPropertiesOfType(type: Type): Symbol[];
-        getRootSymbols(symbol: Symbol): Symbol[];
-        getContextualType(node: Expression): Type | undefined;
-        getContextualTypeForArgumentAtIndex(call: CallLikeExpression, argIndex: number): Type | undefined;
-        getContextualTypeForJsxAttribute(attribute: JsxAttribute | JsxSpreadAttribute): Type | undefined;
-        isContextSensitive(node: Expression | MethodDeclaration | ObjectLiteralElementLike | JsxAttributeLike): boolean;
-        /**
-         * returns unknownSignature in the case of an error.
-         * returns undefined if the node is not valid.
-         * @param argumentCount Apparent number of arguments, passed in case of a possibly incomplete call. This should come from an ArgumentListInfo. See `signatureHelp.ts`.
-         */
-        getResolvedSignature(node: CallLikeExpression, candidatesOutArray?: Signature[], argumentCount?: number): Signature | undefined;
-        getSignatureFromDeclaration(declaration: SignatureDeclaration): Signature | undefined;
-        isImplementationOfOverload(node: SignatureDeclaration): boolean | undefined;
-        isUndefinedSymbol(symbol: Symbol): boolean;
-        isArgumentsSymbol(symbol: Symbol): boolean;
-        isUnknownSymbol(symbol: Symbol): boolean;
-        getMergedSymbol(symbol: Symbol): Symbol;
-        getConstantValue(node: EnumMember | PropertyAccessExpression | ElementAccessExpression): string | number | undefined;
-        isValidPropertyAccess(node: PropertyAccessExpression | QualifiedName | ImportTypeNode, propertyName: string): boolean;
-        /** Exclude accesses to private properties or methods with a `this` parameter that `type` doesn't satisfy. */
-        isValidPropertyAccessForCompletions(node: PropertyAccessExpression | ImportTypeNode, type: Type, property: Symbol): boolean;
-        /** Follow all aliases to get the original symbol. */
-        getAliasedSymbol(symbol: Symbol): Symbol;
-        /** Follow a *single* alias to get the immediately aliased symbol. */
-        getImmediateAliasedSymbol(symbol: Symbol): Symbol | undefined;
-        getExportsOfModule(moduleSymbol: Symbol): Symbol[];
-        /** Unlike `getExportsOfModule`, this includes properties of an `export =` value. */
-        getExportsAndPropertiesOfModule(moduleSymbol: Symbol): Symbol[];
-        getAllAttributesTypeFromJsxOpeningLikeElement(elementNode: JsxOpeningLikeElement): Type | undefined;
-        getJsxIntrinsicTagNamesAt(location: Node): Symbol[];
-        isOptionalParameter(node: ParameterDeclaration): boolean;
-        getAmbientModules(): Symbol[];
-        tryGetMemberInModuleExports(memberName: string, moduleSymbol: Symbol): Symbol | undefined;
-        /**
-         * Unlike `tryGetMemberInModuleExports`, this includes properties of an `export =` value.
-         * Does *not* return properties of primitive types.
-         */
-        tryGetMemberInModuleExportsAndProperties(memberName: string, moduleSymbol: Symbol): Symbol | undefined;
-        getApparentType(type: Type): Type;
-        getSuggestionForNonexistentProperty(node: Identifier, containingType: Type): string | undefined;
-        getSuggestionForNonexistentSymbol(location: Node, name: string, meaning: SymbolFlags): string | undefined;
-        getSuggestionForNonexistentModule(node: Identifier, target: Symbol): string | undefined;
-        getBaseConstraintOfType(type: Type): Type | undefined;
-        getDefaultFromTypeParameter(type: Type): Type | undefined;
-        getAnyType(): Type;
-        getStringType(): Type;
-        getNumberType(): Type;
-        getBooleanType(): Type;
-        getFalseType(): Type;
-        getTrueType(): Type;
-        getVoidType(): Type;
-        getUndefinedType(): Type;
-        getNullType(): Type;
-        getESSymbolType(): Type;
-        getNeverType(): Type;
-        getUnionType(types: Type[], subtypeReduction?: UnionReduction): Type;
-        createArrayType(elementType: Type): Type;
-        createPromiseType(type: Type): Type;
-        createAnonymousType(symbol: Symbol, members: SymbolTable, callSignatures: Signature[], constructSignatures: Signature[], stringIndexInfo: IndexInfo | undefined, numberIndexInfo: IndexInfo | undefined): Type;
-        createSignature(declaration: SignatureDeclaration, typeParameters: TypeParameter[] | undefined, thisParameter: Symbol | undefined, parameters: Symbol[], resolvedReturnType: Type, typePredicate: TypePredicate | undefined, minArgumentCount: number, hasRestParameter: boolean, hasLiteralTypes: boolean): Signature;
-        createSymbol(flags: SymbolFlags, name: __String): TransientSymbol;
-        createIndexInfo(type: Type, isReadonly: boolean, declaration?: SignatureDeclaration): IndexInfo;
-        isSymbolAccessible(symbol: Symbol, enclosingDeclaration: Node | undefined, meaning: SymbolFlags, shouldComputeAliasToMarkVisible: boolean): SymbolAccessibilityResult;
-        tryFindAmbientModuleWithoutAugmentations(moduleName: string): Symbol | undefined;
-        getSymbolWalker(accept?: (symbol: Symbol) => boolean): SymbolWalker;
-        getDiagnostics(sourceFile?: SourceFile, cancellationToken?: CancellationToken): Diagnostic[];
-        getGlobalDiagnostics(): Diagnostic[];
-        getEmitResolver(sourceFile?: SourceFile, cancellationToken?: CancellationToken): EmitResolver;
-        getNodeCount(): number;
-        getIdentifierCount(): number;
-        getSymbolCount(): number;
-        getTypeCount(): number;
-        isArrayLikeType(type: Type): boolean;
-        /**
-         * For a union, will include a property if it's defined in *any* of the member types.
-         * So for `{ a } | { b }`, this will include both `a` and `b`.
-         * Does not include properties of primitive types.
-         */
-        getAllPossiblePropertiesOfTypes(type: ReadonlyArray<Type>): Symbol[];
-        resolveName(name: string, location: Node, meaning: SymbolFlags, excludeGlobals: boolean): Symbol | undefined;
-        getJsxNamespace(location?: Node): string;
-        /**
-         * Note that this will return undefined in the following case:
-         *     // a.ts
-         *     export namespace N { export class C { } }
-         *     // b.ts
-         *     <<enclosingDeclaration>>
-         * Where `C` is the symbol we're looking for.
-         * This should be called in a loop climbing parents of the symbol, so we'll get `N`.
-         */
-        getAccessibleSymbolChain(symbol: Symbol, enclosingDeclaration: Node | undefined, meaning: SymbolFlags, useOnlyExternalAliasing: boolean): Symbol[] | undefined;
-        getTypePredicateOfSignature(signature: Signature): TypePredicate;
-        resolveExternalModuleSymbol(symbol: Symbol): Symbol;
-        /** @param node A location where we might consider accessing `this`. Not necessarily a ThisExpression. */
-        tryGetThisTypeAt(node: Node): Type | undefined;
-        getTypeArgumentConstraint(node: TypeNode): Type | undefined;
-        /**
-         * Does *not* get *all* suggestion diagnostics, just the ones that were convenient to report in the checker.
-         * Others are added in computeSuggestionDiagnostics.
-         */
-        getSuggestionDiagnostics(file: SourceFile, cancellationToken?: CancellationToken): ReadonlyArray<DiagnosticWithLocation>;
-        /**
-         * Depending on the operation performed, it may be appropriate to throw away the checker
-         * if the cancellation token is triggered. Typically, if it is used for error checking
-         * and the operation is cancelled, then it should be discarded, otherwise it is safe to keep.
-         */
-        runWithCancellationToken<T>(token: CancellationToken, cb: (checker: TypeChecker) => T): T;
-    }
-    enum UnionReduction {
-        None = 0,
-        Literal = 1,
-        Subtype = 2
-    }
-    enum NodeBuilderFlags {
-        None = 0,
-        NoTruncation = 1,
-        WriteArrayAsGenericType = 2,
-        GenerateNamesForShadowedTypeParams = 4,
-        UseStructuralFallback = 8,
-        ForbidIndexedAccessSymbolReferences = 16,
-        WriteTypeArgumentsOfSignature = 32,
-        UseFullyQualifiedType = 64,
-        UseOnlyExternalAliasing = 128,
-        SuppressAnyReturnType = 256,
-        WriteTypeParametersInQualifiedName = 512,
-        MultilineObjectLiterals = 1024,
-        WriteClassExpressionAsTypeLiteral = 2048,
-        UseTypeOfFunction = 4096,
-        OmitParameterModifiers = 8192,
-        UseAliasDefinedOutsideCurrentScope = 16384,
-        AllowThisInObjectLiteral = 32768,
-        AllowQualifedNameInPlaceOfIdentifier = 65536,
-        AllowAnonymousIdentifier = 131072,
-        AllowEmptyUnionOrIntersection = 262144,
-        AllowEmptyTuple = 524288,
-        AllowUniqueESSymbolType = 1048576,
-        AllowEmptyIndexInfoType = 2097152,
-        IgnoreErrors = 3112960,
-        InObjectTypeLiteral = 4194304,
-        InTypeAlias = 8388608,
-        InInitialEntityName = 16777216,
-        InReverseMappedType = 33554432
-    }
-    enum TypeFormatFlags {
-        None = 0,
-        NoTruncation = 1,
-        WriteArrayAsGenericType = 2,
-        UseStructuralFallback = 8,
-        WriteTypeArgumentsOfSignature = 32,
-        UseFullyQualifiedType = 64,
-        SuppressAnyReturnType = 256,
-        MultilineObjectLiterals = 1024,
-        WriteClassExpressionAsTypeLiteral = 2048,
-        UseTypeOfFunction = 4096,
-        OmitParameterModifiers = 8192,
-        UseAliasDefinedOutsideCurrentScope = 16384,
-        AllowUniqueESSymbolType = 1048576,
-        AddUndefined = 131072,
-        WriteArrowStyleSignature = 262144,
-        InArrayType = 524288,
-        InElementType = 2097152,
-        InFirstTypeArgument = 4194304,
-        InTypeAlias = 8388608,
-        /** @deprecated */ WriteOwnNameForAnyLike = 0,
-        NodeBuilderFlagsMask = 9469291
-    }
-    enum SymbolFormatFlags {
-        None = 0,
-        WriteTypeParametersOrArguments = 1,
-        UseOnlyExternalAliasing = 2,
-        AllowAnyNodeKind = 4,
-        UseAliasDefinedOutsideCurrentScope = 8
-    }
-    interface SymbolWalker {
-        /** Note: Return values are not ordered. */
-        walkType(root: Type): {
-            visitedTypes: ReadonlyArray<Type>;
-            visitedSymbols: ReadonlyArray<Symbol>;
-        };
-        /** Note: Return values are not ordered. */
-        walkSymbol(root: Symbol): {
-            visitedTypes: ReadonlyArray<Type>;
-            visitedSymbols: ReadonlyArray<Symbol>;
-        };
-    }
-    /**
-     * @deprecated
-     */
-    interface SymbolDisplayBuilder {
-        /** @deprecated */ buildTypeDisplay(type: Type, writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags): void;
-        /** @deprecated */ buildSymbolDisplay(symbol: Symbol, writer: SymbolWriter, enclosingDeclaration?: Node, meaning?: SymbolFlags, flags?: SymbolFormatFlags): void;
-        /** @deprecated */ buildSignatureDisplay(signature: Signature, writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags, kind?: SignatureKind): void;
-        /** @deprecated */ buildIndexSignatureDisplay(info: IndexInfo, writer: SymbolWriter, kind: IndexKind, enclosingDeclaration?: Node, globalFlags?: TypeFormatFlags, symbolStack?: Symbol[]): void;
-        /** @deprecated */ buildParameterDisplay(parameter: Symbol, writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags): void;
-        /** @deprecated */ buildTypeParameterDisplay(tp: TypeParameter, writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags): void;
-        /** @deprecated */ buildTypePredicateDisplay(predicate: TypePredicate, writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags): void;
-        /** @deprecated */ buildTypeParameterDisplayFromSymbol(symbol: Symbol, writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags): void;
-        /** @deprecated */ buildDisplayForParametersAndDelimiters(thisParameter: Symbol, parameters: Symbol[], writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags): void;
-        /** @deprecated */ buildDisplayForTypeParametersAndDelimiters(typeParameters: TypeParameter[], writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags): void;
-        /** @deprecated */ buildReturnTypeDisplay(signature: Signature, writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags): void;
-    }
-    /**
-     * @deprecated Migrate to other methods of generating symbol names, ex symbolToEntityName + a printer or symbolToString
-     */
-    interface SymbolWriter extends SymbolTracker {
-        writeKeyword(text: string): void;
-        writeOperator(text: string): void;
-        writePunctuation(text: string): void;
-        writeSpace(text: string): void;
-        writeStringLiteral(text: string): void;
-        writeParameter(text: string): void;
-        writeProperty(text: string): void;
-        writeSymbol(text: string, symbol: Symbol): void;
-        writeLine(): void;
-        increaseIndent(): void;
-        decreaseIndent(): void;
-        clear(): void;
-    }
-    enum SymbolAccessibility {
-        Accessible = 0,
-        NotAccessible = 1,
-        CannotBeNamed = 2
-    }
-    enum SyntheticSymbolKind {
-        UnionOrIntersection = 0,
-        Spread = 1
-    }
-    enum TypePredicateKind {
-        This = 0,
-        Identifier = 1
-    }
-    interface TypePredicateBase {
-        kind: TypePredicateKind;
-        type: Type;
-    }
-    interface ThisTypePredicate extends TypePredicateBase {
-        kind: TypePredicateKind.This;
-    }
-    interface IdentifierTypePredicate extends TypePredicateBase {
-        kind: TypePredicateKind.Identifier;
-        parameterName: string;
-        parameterIndex: number;
-    }
-    type TypePredicate = IdentifierTypePredicate | ThisTypePredicate;
-    type AnyImportSyntax = ImportDeclaration | ImportEqualsDeclaration;
-    type AnyImportOrReExport = AnyImportSyntax | ExportDeclaration;
-    interface ValidImportTypeNode extends ImportTypeNode {
-        argument: LiteralTypeNode & {
-            literal: StringLiteral;
-        };
-    }
-    type AnyValidImportOrReExport = (ImportDeclaration | ExportDeclaration) & {
-        moduleSpecifier: StringLiteral;
-    } | ImportEqualsDeclaration & {
-        moduleReference: ExternalModuleReference & {
-            expression: StringLiteral;
-        };
-    } | RequireOrImportCall | ValidImportTypeNode;
-    type RequireOrImportCall = CallExpression & {
-        arguments: [StringLiteralLike];
-    };
-    type LateVisibilityPaintedStatement = AnyImportSyntax | VariableStatement | ClassDeclaration | FunctionDeclaration | ModuleDeclaration | TypeAliasDeclaration | InterfaceDeclaration | EnumDeclaration;
-    interface SymbolVisibilityResult {
-        accessibility: SymbolAccessibility;
-        aliasesToMakeVisible?: LateVisibilityPaintedStatement[];
-        errorSymbolName?: string;
-        errorNode?: Node;
-    }
-    interface SymbolAccessibilityResult extends SymbolVisibilityResult {
-        errorModuleName?: string;
-    }
-    interface AllAccessorDeclarations {
-        firstAccessor: AccessorDeclaration;
-        secondAccessor: AccessorDeclaration | undefined;
-        getAccessor: AccessorDeclaration | undefined;
-        setAccessor: AccessorDeclaration | undefined;
-    }
-    /** Indicates how to serialize the name for a TypeReferenceNode when emitting decorator metadata */
-    enum TypeReferenceSerializationKind {
-        Unknown = 0,
-        TypeWithConstructSignatureAndValue = 1,
-        VoidNullableOrNeverType = 2,
-        NumberLikeType = 3,
-        StringLikeType = 4,
-        BooleanType = 5,
-        ArrayLikeType = 6,
-        ESSymbolType = 7,
-        Promise = 8,
-        TypeWithCallSignature = 9,
-        ObjectType = 10
-    }
-    interface EmitResolver {
-        hasGlobalName(name: string): boolean;
-        getReferencedExportContainer(node: Identifier, prefixLocals?: boolean): SourceFile | ModuleDeclaration | EnumDeclaration | undefined;
-        getReferencedImportDeclaration(node: Identifier): Declaration | undefined;
-        getReferencedDeclarationWithCollidingName(node: Identifier): Declaration | undefined;
-        isDeclarationWithCollidingName(node: Declaration): boolean;
-        isValueAliasDeclaration(node: Node): boolean;
-        isReferencedAliasDeclaration(node: Node, checkChildren?: boolean): boolean;
-        isTopLevelValueImportEqualsWithEntityName(node: ImportEqualsDeclaration): boolean;
-        getNodeCheckFlags(node: Node): NodeCheckFlags;
-        isDeclarationVisible(node: Declaration | AnyImportSyntax): boolean;
-        isLateBound(node: Declaration): node is LateBoundDeclaration;
-        collectLinkedAliases(node: Identifier): Node[] | undefined;
-        isImplementationOfOverload(node: FunctionLike): boolean | undefined;
-        isRequiredInitializedParameter(node: ParameterDeclaration): boolean;
-        isOptionalUninitializedParameterProperty(node: ParameterDeclaration): boolean;
-        createTypeOfDeclaration(declaration: AccessorDeclaration | VariableLikeDeclaration, enclosingDeclaration: Node, flags: NodeBuilderFlags, tracker: SymbolTracker, addUndefined?: boolean): TypeNode | undefined;
-        createReturnTypeOfSignatureDeclaration(signatureDeclaration: SignatureDeclaration, enclosingDeclaration: Node, flags: NodeBuilderFlags, tracker: SymbolTracker): TypeNode | undefined;
-        createTypeOfExpression(expr: Expression, enclosingDeclaration: Node, flags: NodeBuilderFlags, tracker: SymbolTracker): TypeNode | undefined;
-        createLiteralConstValue(node: VariableDeclaration | PropertyDeclaration | PropertySignature | ParameterDeclaration): Expression;
-        isSymbolAccessible(symbol: Symbol, enclosingDeclaration: Node | undefined, meaning: SymbolFlags | undefined, shouldComputeAliasToMarkVisible: boolean): SymbolAccessibilityResult;
-        isEntityNameVisible(entityName: EntityNameOrEntityNameExpression, enclosingDeclaration: Node): SymbolVisibilityResult;
-        getConstantValue(node: EnumMember | PropertyAccessExpression | ElementAccessExpression): string | number | undefined;
-        getReferencedValueDeclaration(reference: Identifier): Declaration | undefined;
-        getTypeReferenceSerializationKind(typeName: EntityName, location?: Node): TypeReferenceSerializationKind;
-        isOptionalParameter(node: ParameterDeclaration): boolean;
-        moduleExportsSomeValue(moduleReferenceExpression: Expression): boolean;
-        isArgumentsLocalBinding(node: Identifier): boolean;
-        getExternalModuleFileFromDeclaration(declaration: ImportEqualsDeclaration | ImportDeclaration | ExportDeclaration | ModuleDeclaration | ImportTypeNode): SourceFile | undefined;
-        getTypeReferenceDirectivesForEntityName(name: EntityNameOrEntityNameExpression): string[] | undefined;
-        getTypeReferenceDirectivesForSymbol(symbol: Symbol, meaning?: SymbolFlags): string[] | undefined;
-        isLiteralConstDeclaration(node: VariableDeclaration | PropertyDeclaration | PropertySignature | ParameterDeclaration): boolean;
-        getJsxFactoryEntity(location?: Node): EntityName | undefined;
-        getAllAccessorDeclarations(declaration: AccessorDeclaration): AllAccessorDeclarations;
-    }
-    enum SymbolFlags {
-        None = 0,
-        FunctionScopedVariable = 1,
-        BlockScopedVariable = 2,
-        Property = 4,
-        EnumMember = 8,
-        Function = 16,
-        Class = 32,
-        Interface = 64,
-        ConstEnum = 128,
-        RegularEnum = 256,
-        ValueModule = 512,
-        NamespaceModule = 1024,
-        TypeLiteral = 2048,
-        ObjectLiteral = 4096,
-        Method = 8192,
-        Constructor = 16384,
-        GetAccessor = 32768,
-        SetAccessor = 65536,
-        Signature = 131072,
-        TypeParameter = 262144,
-        TypeAlias = 524288,
-        ExportValue = 1048576,
-        Alias = 2097152,
-        Prototype = 4194304,
-        ExportStar = 8388608,
-        Optional = 16777216,
-        Transient = 33554432,
-        JSContainer = 67108864,
-        All = 67108863,
-        Enum = 384,
-        Variable = 3,
-        Value = 67216319,
-        Type = 67901928,
-        Namespace = 1920,
-        Module = 1536,
-        Accessor = 98304,
-        FunctionScopedVariableExcludes = 67216318,
-        BlockScopedVariableExcludes = 67216319,
-        ParameterExcludes = 67216319,
-        PropertyExcludes = 0,
-        EnumMemberExcludes = 68008959,
-        FunctionExcludes = 67215791,
-        ClassExcludes = 68008383,
-        InterfaceExcludes = 67901832,
-        RegularEnumExcludes = 68008191,
-        ConstEnumExcludes = 68008831,
-        ValueModuleExcludes = 67215503,
-        NamespaceModuleExcludes = 0,
-        MethodExcludes = 67208127,
-        GetAccessorExcludes = 67150783,
-        SetAccessorExcludes = 67183551,
-        TypeParameterExcludes = 67639784,
-        TypeAliasExcludes = 67901928,
-        AliasExcludes = 2097152,
-        ModuleMember = 2623475,
-        ExportHasLocal = 944,
-        HasExports = 1952,
-        HasMembers = 6240,
-        BlockScoped = 418,
-        PropertyOrAccessor = 98308,
-        ClassMember = 106500,
-        Classifiable = 2885600,
-        LateBindingContainer = 6240
-    }
-    interface Symbol {
-        flags: SymbolFlags;
-        escapedName: __String;
-        declarations: Declaration[];
-        valueDeclaration: Declaration;
-        members?: SymbolTable;
-        exports?: SymbolTable;
-        globalExports?: SymbolTable;
-        id?: number;
-        mergeId?: number;
-        parent?: Symbol;
-        exportSymbol?: Symbol;
-        nameType?: Type;
-        constEnumOnlyModule?: boolean;
-        isReferenced?: SymbolFlags;
-        isReplaceableByMethod?: boolean;
-        isAssigned?: boolean;
-    }
-    interface SymbolLinks {
-        immediateTarget?: Symbol;
-        target?: Symbol;
-        type?: Type;
-        uniqueESSymbolType?: Type;
-        declaredType?: Type;
-        typeParameters?: TypeParameter[];
-        outerTypeParameters?: TypeParameter[];
-        inferredClassType?: Type;
-        instantiations?: Map<Type>;
-        mapper?: TypeMapper;
-        referenced?: boolean;
-        containingType?: UnionOrIntersectionType;
-        leftSpread?: Symbol;
-        rightSpread?: Symbol;
-        syntheticOrigin?: Symbol;
-        isDiscriminantProperty?: boolean;
-        resolvedExports?: SymbolTable;
-        resolvedMembers?: SymbolTable;
-        exportsChecked?: boolean;
-        typeParametersChecked?: boolean;
-        isDeclarationWithCollidingName?: boolean;
-        bindingElement?: BindingElement;
-        exportsSomeValue?: boolean;
-        enumKind?: EnumKind;
-        originatingImport?: ImportDeclaration | ImportCall;
-        lateSymbol?: Symbol;
-    }
-    enum EnumKind {
-        Numeric = 0,
-        Literal = 1
-    }
-    enum CheckFlags {
-        Instantiated = 1,
-        SyntheticProperty = 2,
-        SyntheticMethod = 4,
-        Readonly = 8,
-        Partial = 16,
-        HasNonUniformType = 32,
-        ContainsPublic = 64,
-        ContainsProtected = 128,
-        ContainsPrivate = 256,
-        ContainsStatic = 512,
-        Late = 1024,
-        ReverseMapped = 2048,
-        Synthetic = 6
-    }
-    interface TransientSymbol extends Symbol, SymbolLinks {
-        checkFlags: CheckFlags;
-        isRestParameter?: boolean;
-    }
-    interface ReverseMappedSymbol extends TransientSymbol {
-        propertyType: Type;
-        mappedType: MappedType;
-    }
-    enum InternalSymbolName {
-        Call = "__call",
-        Constructor = "__constructor",
-        New = "__new",
-        Index = "__index",
-        ExportStar = "__export",
-        Global = "__global",
-        Missing = "__missing",
-        Type = "__type",
-        Object = "__object",
-        JSXAttributes = "__jsxAttributes",
-        Class = "__class",
-        Function = "__function",
-        Computed = "__computed",
-        Resolving = "__resolving__",
-        ExportEquals = "export=",
-        Default = "default"
-    }
-    /**
-     * This represents a string whose leading underscore have been escaped by adding extra leading underscores.
-     * The shape of this brand is rather unique compared to others we've used.
-     * Instead of just an intersection of a string and an object, it is that union-ed
-     * with an intersection of void and an object. This makes it wholly incompatible
-     * with a normal string (which is good, it cannot be misused on assignment or on usage),
-     * while still being comparable with a normal string via === (also good) and castable from a string.
-     */
-    type __String = (string & {
-        __escapedIdentifier: void;
-    }) | (void & {
-        __escapedIdentifier: void;
-    }) | InternalSymbolName;
-    /** ReadonlyMap where keys are `__String`s. */
-    interface ReadonlyUnderscoreEscapedMap<T> {
-        get(key: __String): T | undefined;
-        has(key: __String): boolean;
-        forEach(action: (value: T, key: __String) => void): void;
-        readonly size: number;
-        keys(): Iterator<__String>;
-        values(): Iterator<T>;
-        entries(): Iterator<[__String, T]>;
-    }
-    /** Map where keys are `__String`s. */
-    interface UnderscoreEscapedMap<T> extends ReadonlyUnderscoreEscapedMap<T> {
-        set(key: __String, value: T): this;
-        delete(key: __String): boolean;
-        clear(): void;
-    }
-    /** SymbolTable based on ES6 Map interface. */
-    type SymbolTable = UnderscoreEscapedMap<Symbol>;
-    /** Used to track a `declare module "foo*"`-like declaration. */
-    interface PatternAmbientModule {
-        pattern: Pattern;
-        symbol: Symbol;
-    }
-    enum NodeCheckFlags {
-        TypeChecked = 1,
-        LexicalThis = 2,
-        CaptureThis = 4,
-        CaptureNewTarget = 8,
-        SuperInstance = 256,
-        SuperStatic = 512,
-        ContextChecked = 1024,
-        AsyncMethodWithSuper = 2048,
-        AsyncMethodWithSuperBinding = 4096,
-        CaptureArguments = 8192,
-        EnumValuesComputed = 16384,
-        LexicalModuleMergesWithClass = 32768,
-        LoopWithCapturedBlockScopedBinding = 65536,
-        CapturedBlockScopedBinding = 131072,
-        BlockScopedBindingInLoop = 262144,
-        ClassWithBodyScopedClassBinding = 524288,
-        BodyScopedClassBinding = 1048576,
-        NeedsLoopOutParameter = 2097152,
-        AssignmentsMarked = 4194304,
-        ClassWithConstructorReference = 8388608,
-        ConstructorReferenceInClass = 16777216
-    }
-    interface NodeLinks {
-        flags: NodeCheckFlags;
-        resolvedType?: Type;
-        resolvedSignature?: Signature;
-        resolvedSignatures?: Map<Signature[]>;
-        resolvedSymbol?: Symbol;
-        resolvedIndexInfo?: IndexInfo;
-        maybeTypePredicate?: boolean;
-        enumMemberValue?: string | number;
-        isVisible?: boolean;
-        containsArgumentsReference?: boolean;
-        hasReportedStatementInAmbientContext?: boolean;
-        jsxFlags: JsxFlags;
-        resolvedJsxElementAttributesType?: Type;
-        resolvedJsxElementAllAttributesType?: Type;
-        hasSuperCall?: boolean;
-        superCall?: SuperCall;
-        switchTypes?: Type[];
-    }
-    enum TypeFlags {
-        Any = 1,
-        Unknown = 2,
-        String = 4,
-        Number = 8,
-        Boolean = 16,
-        Enum = 32,
-        StringLiteral = 64,
-        NumberLiteral = 128,
-        BooleanLiteral = 256,
-        EnumLiteral = 512,
-        ESSymbol = 1024,
-        UniqueESSymbol = 2048,
-        Void = 4096,
-        Undefined = 8192,
-        Null = 16384,
-        Never = 32768,
-        TypeParameter = 65536,
-        Object = 131072,
-        Union = 262144,
-        Intersection = 524288,
-        Index = 1048576,
-        IndexedAccess = 2097152,
-        Conditional = 4194304,
-        Substitution = 8388608,
-        NonPrimitive = 16777216,
-        FreshLiteral = 33554432,
-        UnionOfUnitTypes = 67108864,
-        ContainsWideningType = 134217728,
-        ContainsObjectLiteral = 268435456,
-        ContainsAnyFunctionType = 536870912,
-        AnyOrUnknown = 3,
-        Nullable = 24576,
-        Literal = 448,
-        Unit = 27072,
-        StringOrNumberLiteral = 192,
-        StringOrNumberLiteralOrUnique = 2240,
-        DefinitelyFalsy = 29120,
-        PossiblyFalsy = 29148,
-        Intrinsic = 16839967,
-        Primitive = 32764,
-        StringLike = 68,
-        NumberLike = 168,
-        BooleanLike = 272,
-        EnumLike = 544,
-        ESSymbolLike = 3072,
-        VoidLike = 12288,
-        DisjointDomains = 16809468,
-        UnionOrIntersection = 786432,
-        StructuredType = 917504,
-        TypeVariable = 2162688,
-        InstantiableNonPrimitive = 14745600,
-        InstantiablePrimitive = 1048576,
-        Instantiable = 15794176,
-        StructuredOrInstantiable = 16711680,
-        Narrowable = 33492479,
-        NotUnionOrUnit = 16909315,
-        NotUnit = 16749629,
-        RequiresWidening = 402653184,
-        PropagatingFlags = 939524096,
-        NonWideningType = 134217728,
-        Wildcard = 268435456,
-        EmptyObject = 536870912,
-        ConstructionFlags = 939524096,
-        GenericMappedType = 134217728
-    }
-    type DestructuringPattern = BindingPattern | ObjectLiteralExpression | ArrayLiteralExpression;
-    interface Type {
-        flags: TypeFlags;
-        id: number;
-        checker: TypeChecker;
-        symbol: Symbol;
-        pattern?: DestructuringPattern;
-        aliasSymbol?: Symbol;
-        aliasTypeArguments?: Type[];
-        wildcardInstantiation?: Type;
-    }
-    interface IntrinsicType extends Type {
-        intrinsicName: string;
-    }
-    interface LiteralType extends Type {
-        value: string | number;
-        freshType: LiteralType;
-        regularType: LiteralType;
-    }
-    interface UniqueESSymbolType extends Type {
-        symbol: Symbol;
-    }
-    interface StringLiteralType extends LiteralType {
-        value: string;
-    }
-    interface NumberLiteralType extends LiteralType {
-        value: number;
-    }
-    interface EnumType extends Type {
-    }
-    enum ObjectFlags {
-        Class = 1,
-        Interface = 2,
-        Reference = 4,
-        Tuple = 8,
-        Anonymous = 16,
-        Mapped = 32,
-        Instantiated = 64,
-        ObjectLiteral = 128,
-        EvolvingArray = 256,
-        ObjectLiteralPatternWithComputedProperties = 512,
-        ContainsSpread = 1024,
-        ReverseMapped = 2048,
-        JsxAttributes = 4096,
-        MarkerType = 8192,
-        ClassOrInterface = 3
-    }
-    interface ObjectType extends Type {
-        objectFlags: ObjectFlags;
-    }
-    /** Class and interface types (ObjectFlags.Class and ObjectFlags.Interface). */
-    interface InterfaceType extends ObjectType {
-        typeParameters: TypeParameter[] | undefined;
-        outerTypeParameters: TypeParameter[] | undefined;
-        localTypeParameters: TypeParameter[] | undefined;
-        thisType: TypeParameter | undefined;
-        resolvedBaseConstructorType?: Type;
-        resolvedBaseTypes: BaseType[];
-    }
-    type BaseType = ObjectType | IntersectionType;
-    interface InterfaceTypeWithDeclaredMembers extends InterfaceType {
-        declaredProperties: Symbol[];
-        declaredCallSignatures: Signature[];
-        declaredConstructSignatures: Signature[];
-        declaredStringIndexInfo?: IndexInfo;
-        declaredNumberIndexInfo?: IndexInfo;
-    }
-    /**
-     * Type references (ObjectFlags.Reference). When a class or interface has type parameters or
-     * a "this" type, references to the class or interface are made using type references. The
-     * typeArguments property specifies the types to substitute for the type parameters of the
-     * class or interface and optionally includes an extra element that specifies the type to
-     * substitute for "this" in the resulting instantiation. When no extra argument is present,
-     * the type reference itself is substituted for "this". The typeArguments property is undefined
-     * if the class or interface has no type parameters and the reference isn't specifying an
-     * explicit "this" argument.
-     */
-    interface TypeReference extends ObjectType {
-        target: GenericType;
-        typeArguments?: Type[];
-    }
-    enum Variance {
-        Invariant = 0,
-        Covariant = 1,
-        Contravariant = 2,
-        Bivariant = 3,
-        Independent = 4
-    }
-    interface GenericType extends InterfaceType, TypeReference {
-        instantiations: Map<TypeReference>;
-        variances?: Variance[];
-    }
-    interface UnionOrIntersectionType extends Type {
-        types: Type[];
-        propertyCache: SymbolTable;
-        resolvedProperties: Symbol[];
-        resolvedIndexType: IndexType;
-        resolvedStringIndexType: IndexType;
-        resolvedBaseConstraint: Type;
-        couldContainTypeVariables: boolean;
-    }
-    interface UnionType extends UnionOrIntersectionType {
-    }
-    interface IntersectionType extends UnionOrIntersectionType {
-        resolvedApparentType: Type;
-    }
-    type StructuredType = ObjectType | UnionType | IntersectionType;
-    interface AnonymousType extends ObjectType {
-        target?: AnonymousType;
-        mapper?: TypeMapper;
-    }
-    interface MappedType extends AnonymousType {
-        declaration: MappedTypeNode;
-        typeParameter?: TypeParameter;
-        constraintType?: Type;
-        templateType?: Type;
-        modifiersType?: Type;
-    }
-    interface EvolvingArrayType extends ObjectType {
-        elementType: Type;
-        finalArrayType?: Type;
-    }
-    interface ReverseMappedType extends ObjectType {
-        source: Type;
-        mappedType: MappedType;
-    }
-    interface ResolvedType extends ObjectType, UnionOrIntersectionType {
-        members: SymbolTable;
-        properties: Symbol[];
-        callSignatures: Signature[];
-        constructSignatures: Signature[];
-        stringIndexInfo?: IndexInfo;
-        numberIndexInfo?: IndexInfo;
-    }
-    interface FreshObjectLiteralType extends ResolvedType {
-        regularType: ResolvedType;
-    }
-    interface IterableOrIteratorType extends ObjectType, UnionType {
-        iteratedTypeOfIterable?: Type;
-        iteratedTypeOfIterator?: Type;
-        iteratedTypeOfAsyncIterable?: Type;
-        iteratedTypeOfAsyncIterator?: Type;
-    }
-    interface PromiseOrAwaitableType extends ObjectType, UnionType {
-        promiseTypeOfPromiseConstructor?: Type;
-        promisedTypeOfPromise?: Type;
-        awaitedTypeOfType?: Type;
-    }
-    interface SyntheticDefaultModuleType extends Type {
-        syntheticType?: Type;
-    }
-    interface InstantiableType extends Type {
-        resolvedBaseConstraint?: Type;
-        resolvedIndexType?: IndexType;
-        resolvedStringIndexType?: IndexType;
-    }
-    interface TypeParameter extends InstantiableType {
-        /** Retrieve using getConstraintFromTypeParameter */
-        constraint?: Type;
-        default?: Type;
-        target?: TypeParameter;
-        mapper?: TypeMapper;
-        isThisType?: boolean;
-        resolvedDefaultType?: Type;
-    }
-    interface IndexedAccessType extends InstantiableType {
-        objectType: Type;
-        indexType: Type;
-        constraint?: Type;
-        simplified?: Type;
-    }
-    type TypeVariable = TypeParameter | IndexedAccessType;
-    interface IndexType extends InstantiableType {
-        type: InstantiableType | UnionOrIntersectionType;
-        stringsOnly: boolean;
-    }
-    interface ConditionalRoot {
-        node: ConditionalTypeNode;
-        checkType: Type;
-        extendsType: Type;
-        trueType: Type;
-        falseType: Type;
-        isDistributive: boolean;
-        inferTypeParameters?: TypeParameter[];
-        outerTypeParameters?: TypeParameter[];
-        instantiations?: Map<Type>;
-        aliasSymbol?: Symbol;
-        aliasTypeArguments?: Type[];
-    }
-    interface ConditionalType extends InstantiableType {
-        root: ConditionalRoot;
-        checkType: Type;
-        extendsType: Type;
-        resolvedTrueType?: Type;
-        resolvedFalseType?: Type;
-        resolvedDefaultConstraint?: Type;
-        mapper?: TypeMapper;
-        combinedMapper?: TypeMapper;
-    }
-    interface SubstitutionType extends InstantiableType {
-        typeVariable: TypeVariable;
-        substitute: Type;
-    }
-    enum SignatureKind {
-        Call = 0,
-        Construct = 1
-    }
-    interface Signature {
-        declaration?: SignatureDeclaration | JSDocSignature;
-        typeParameters?: TypeParameter[];
-        parameters: Symbol[];
-        thisParameter?: Symbol;
-        resolvedReturnType?: Type;
-        resolvedTypePredicate?: TypePredicate;
-        minArgumentCount: number;
-        hasRestParameter: boolean;
-        hasLiteralTypes: boolean;
-        target?: Signature;
-        mapper?: TypeMapper;
-        unionSignatures?: Signature[];
-        erasedSignatureCache?: Signature;
-        canonicalSignatureCache?: Signature;
-        isolatedSignatureType?: ObjectType;
-        instantiations?: Map<Signature>;
-    }
-    enum IndexKind {
-        String = 0,
-        Number = 1
-    }
-    interface IndexInfo {
-        type: Type;
-        isReadonly: boolean;
-        declaration?: IndexSignatureDeclaration;
-    }
-    type TypeMapper = (t: TypeParameter) => Type;
-    enum InferencePriority {
-        NakedTypeVariable = 1,
-        HomomorphicMappedType = 2,
-        MappedTypeConstraint = 4,
-        ReturnType = 8,
-        LiteralKeyof = 16,
-        NoConstraints = 32,
-        AlwaysStrict = 64,
-        PriorityImpliesCombination = 28
-    }
-    interface InferenceInfo {
-        typeParameter: TypeParameter;
-        candidates: Type[] | undefined;
-        contraCandidates: Type[] | undefined;
-        inferredType?: Type;
-        priority?: InferencePriority;
-        topLevel: boolean;
-        isFixed: boolean;
-    }
-    enum InferenceFlags {
-        None = 0,
-        InferUnionTypes = 1,
-        NoDefault = 2,
-        AnyDefault = 4
-    }
-    /**
-     * Ternary values are defined such that
-     * x & y is False if either x or y is False.
-     * x & y is Maybe if either x or y is Maybe, but neither x or y is False.
-     * x & y is True if both x and y are True.
-     * x | y is False if both x and y are False.
-     * x | y is Maybe if either x or y is Maybe, but neither x or y is True.
-     * x | y is True if either x or y is True.
-     */
-    enum Ternary {
-        False = 0,
-        Maybe = 1,
-        True = -1
-    }
-    type TypeComparer = (s: Type, t: Type, reportErrors?: boolean) => Ternary;
-    interface InferenceContext extends TypeMapper {
-        typeParameters: TypeParameter[];
-        signature?: Signature;
-        inferences: InferenceInfo[];
-        flags: InferenceFlags;
-        compareTypes: TypeComparer;
-    }
-    interface WideningContext {
-        parent?: WideningContext;
-        propertyName?: __String;
-        siblings?: Type[];
-        resolvedProperties?: Symbol[];
-    }
-    enum SpecialPropertyAssignmentKind {
-        None = 0,
-        ExportsProperty = 1,
-        ModuleExports = 2,
-        PrototypeProperty = 3,
-        ThisProperty = 4,
-        Property = 5,
-        Prototype = 6
-    }
-    /** @deprecated Use FileExtensionInfo instead. */
-    type JsFileExtensionInfo = FileExtensionInfo;
-    interface FileExtensionInfo {
-        extension: string;
-        isMixedContent: boolean;
-        scriptKind?: ScriptKind;
-    }
-    interface DiagnosticMessage {
-        key: string;
-        category: DiagnosticCategory;
-        code: number;
-        message: string;
-        reportsUnnecessary?: {};
-    }
-    /**
-     * A linked list of formatted diagnostic messages to be used as part of a multiline message.
-     * It is built from the bottom up, leaving the head to be the "main" diagnostic.
-     * While it seems that DiagnosticMessageChain is structurally similar to DiagnosticMessage,
-     * the difference is that messages are all preformatted in DMC.
-     */
-    interface DiagnosticMessageChain {
-        messageText: string;
-        category: DiagnosticCategory;
-        code: number;
-        next?: DiagnosticMessageChain;
-    }
-    interface Diagnostic {
-        file: SourceFile | undefined;
-        start: number | undefined;
-        length: number | undefined;
-        messageText: string | DiagnosticMessageChain;
-        category: DiagnosticCategory;
-        /** May store more in future. For now, this will simply be `true` to indicate when a diagnostic is an unused-identifier diagnostic. */
-        reportsUnnecessary?: {};
-        code: number;
-        source?: string;
-    }
-    interface DiagnosticWithLocation extends Diagnostic {
-        file: SourceFile;
-        start: number;
-        length: number;
-    }
-    enum DiagnosticCategory {
-        Warning = 0,
-        Error = 1,
-        Suggestion = 2,
-        Message = 3
-    }
-    function diagnosticCategoryName(d: {
-        category: DiagnosticCategory;
-    }, lowerCase?: boolean): string;
-    enum ModuleResolutionKind {
-        Classic = 1,
-        NodeJs = 2
-    }
-    interface PluginImport {
-        name: string;
-    }
-    interface ProjectReference {
-        /** A normalized path on disk */
-        path: string;
-        /** The path as the user originally wrote it */
-        originalPath?: string;
-        /** True if the output of this reference should be prepended to the output of this project. Only valid for --outFile compilations */
-        prepend?: boolean;
-        /** True if it is intended that this reference form a circularity */
-        circular?: boolean;
-    }
-    type CompilerOptionsValue = string | number | boolean | (string | number)[] | string[] | MapLike<string[]> | PluginImport[] | ProjectReference[] | null | undefined;
-    interface CompilerOptions {
-        all?: boolean;
-        allowJs?: boolean;
-        allowNonTsExtensions?: boolean;
-        allowSyntheticDefaultImports?: boolean;
-        allowUnreachableCode?: boolean;
-        allowUnusedLabels?: boolean;
-        alwaysStrict?: boolean;
-        baseUrl?: string;
-        /** An error if set - this should only go through the -b pipeline and not actually be observed */
-        build?: boolean;
-        charset?: string;
-        checkJs?: boolean;
-        configFilePath?: string;
-        /** configFile is set as non enumerable property so as to avoid checking of json source files */
-        readonly configFile?: TsConfigSourceFile;
-        declaration?: boolean;
-        declarationMap?: boolean;
-        emitDeclarationOnly?: boolean;
-        declarationDir?: string;
-        diagnostics?: boolean;
-        extendedDiagnostics?: boolean;
-        disableSizeLimit?: boolean;
-        downlevelIteration?: boolean;
-        emitBOM?: boolean;
-        emitDecoratorMetadata?: boolean;
-        experimentalDecorators?: boolean;
-        forceConsistentCasingInFileNames?: boolean;
-        help?: boolean;
-        importHelpers?: boolean;
-        init?: boolean;
-        inlineSourceMap?: boolean;
-        inlineSources?: boolean;
-        isolatedModules?: boolean;
-        jsx?: JsxEmit;
-        keyofStringsOnly?: boolean;
-        lib?: string[];
-        listEmittedFiles?: boolean;
-        listFiles?: boolean;
-        locale?: string;
-        mapRoot?: string;
-        maxNodeModuleJsDepth?: number;
-        module?: ModuleKind;
-        moduleResolution?: ModuleResolutionKind;
-        newLine?: NewLineKind;
-        noEmit?: boolean;
-        noEmitForJsFiles?: boolean;
-        noEmitHelpers?: boolean;
-        noEmitOnError?: boolean;
-        noErrorTruncation?: boolean;
-        noFallthroughCasesInSwitch?: boolean;
-        noImplicitAny?: boolean;
-        noImplicitReturns?: boolean;
-        noImplicitThis?: boolean;
-        noStrictGenericChecks?: boolean;
-        noUnusedLocals?: boolean;
-        noUnusedParameters?: boolean;
-        noImplicitUseStrict?: boolean;
-        noLib?: boolean;
-        noResolve?: boolean;
-        out?: string;
-        outDir?: string;
-        outFile?: string;
-        paths?: MapLike<string[]>;
-        plugins?: PluginImport[];
-        preserveConstEnums?: boolean;
-        preserveSymlinks?: boolean;
-        preserveWatchOutput?: boolean;
-        project?: string;
-        pretty?: boolean;
-        reactNamespace?: string;
-        jsxFactory?: string;
-        composite?: boolean;
-        removeComments?: boolean;
-        rootDir?: string;
-        rootDirs?: string[];
-        skipLibCheck?: boolean;
-        skipDefaultLibCheck?: boolean;
-        sourceMap?: boolean;
-        sourceRoot?: string;
-        strict?: boolean;
-        strictFunctionTypes?: boolean;
-        strictNullChecks?: boolean;
-        strictPropertyInitialization?: boolean;
-        stripInternal?: boolean;
-        suppressExcessPropertyErrors?: boolean;
-        suppressImplicitAnyIndexErrors?: boolean;
-        suppressOutputPathCheck?: boolean;
-        target?: ScriptTarget;
-        traceResolution?: boolean;
-        resolveJsonModule?: boolean;
-        types?: string[];
-        /** Paths used to compute primary types search locations */
-        typeRoots?: string[];
-        version?: boolean;
-        watch?: boolean;
-        esModuleInterop?: boolean;
-        [option: string]: CompilerOptionsValue | TsConfigSourceFile | undefined;
-    }
-    interface TypeAcquisition {
-        enableAutoDiscovery?: boolean;
-        enable?: boolean;
-        include?: string[];
-        exclude?: string[];
-        [option: string]: string[] | boolean | undefined;
-    }
-    enum ModuleKind {
-        None = 0,
-        CommonJS = 1,
-        AMD = 2,
-        UMD = 3,
-        System = 4,
-        ES2015 = 5,
-        ESNext = 6
-    }
-    enum JsxEmit {
-        None = 0,
-        Preserve = 1,
-        React = 2,
-        ReactNative = 3
-    }
-    enum NewLineKind {
-        CarriageReturnLineFeed = 0,
-        LineFeed = 1
-    }
-    interface LineAndCharacter {
-        /** 0-based. */
-        line: number;
-        character: number;
-    }
-    enum ScriptKind {
-        Unknown = 0,
-        JS = 1,
-        JSX = 2,
-        TS = 3,
-        TSX = 4,
-        External = 5,
-        JSON = 6,
-        /**
-         * Used on extensions that doesn't define the ScriptKind but the content defines it.
-         * Deferred extensions are going to be included in all project contexts.
-         */
-        Deferred = 7
-    }
-    enum ScriptTarget {
-        ES3 = 0,
-        ES5 = 1,
-        ES2015 = 2,
-        ES2016 = 3,
-        ES2017 = 4,
-        ES2018 = 5,
-        ESNext = 6,
-        JSON = 100,
-        Latest = 6
-    }
-    enum LanguageVariant {
-        Standard = 0,
-        JSX = 1
-    }
-    /** Either a parsed command line or a parsed tsconfig.json */
-    interface ParsedCommandLine {
-        options: CompilerOptions;
-        typeAcquisition?: TypeAcquisition;
-        fileNames: string[];
-        projectReferences?: ReadonlyArray<ProjectReference>;
-        raw?: any;
-        errors: Diagnostic[];
-        wildcardDirectories?: MapLike<WatchDirectoryFlags>;
-        compileOnSave?: boolean;
-        configFileSpecs?: ConfigFileSpecs;
-    }
-    enum WatchDirectoryFlags {
-        None = 0,
-        Recursive = 1
-    }
-    interface ConfigFileSpecs {
-        filesSpecs: ReadonlyArray<string> | undefined;
-        referencesSpecs: ReadonlyArray<ProjectReference> | undefined;
-        /**
-         * Present to report errors (user specified specs), validatedIncludeSpecs are used for file name matching
-         */
-        includeSpecs?: ReadonlyArray<string>;
-        /**
-         * Present to report errors (user specified specs), validatedExcludeSpecs are used for file name matching
-         */
-        excludeSpecs?: ReadonlyArray<string>;
-        validatedIncludeSpecs?: ReadonlyArray<string>;
-        validatedExcludeSpecs?: ReadonlyArray<string>;
-        wildcardDirectories: MapLike<WatchDirectoryFlags>;
-    }
-    interface ExpandResult {
-        fileNames: string[];
-        projectReferences: ReadonlyArray<ProjectReference> | undefined;
-        wildcardDirectories: MapLike<WatchDirectoryFlags>;
-        spec: ConfigFileSpecs;
-    }
-    interface CreateProgramOptions {
-        rootNames: ReadonlyArray<string>;
-        options: CompilerOptions;
-        projectReferences?: ReadonlyArray<ProjectReference>;
-        host?: CompilerHost;
-        oldProgram?: Program;
-        configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>;
-    }
-    interface CommandLineOptionBase {
-        name: string;
-        type: "string" | "number" | "boolean" | "object" | "list" | Map<number | string>;
-        isFilePath?: boolean;
-        shortName?: string;
-        description?: DiagnosticMessage;
-        paramType?: DiagnosticMessage;
-        isTSConfigOnly?: boolean;
-        isCommandLineOnly?: boolean;
-        showInSimplifiedHelpView?: boolean;
-        category?: DiagnosticMessage;
-    }
-    interface CommandLineOptionOfPrimitiveType extends CommandLineOptionBase {
-        type: "string" | "number" | "boolean";
-    }
-    interface CommandLineOptionOfCustomType extends CommandLineOptionBase {
-        type: Map<number | string>;
-    }
-    interface TsConfigOnlyOption extends CommandLineOptionBase {
-        type: "object";
-        elementOptions?: Map<CommandLineOption>;
-        extraKeyDiagnosticMessage?: DiagnosticMessage;
-    }
-    interface CommandLineOptionOfListType extends CommandLineOptionBase {
-        type: "list";
-        element: CommandLineOptionOfCustomType | CommandLineOptionOfPrimitiveType | TsConfigOnlyOption;
-    }
-    type CommandLineOption = CommandLineOptionOfCustomType | CommandLineOptionOfPrimitiveType | TsConfigOnlyOption | CommandLineOptionOfListType;
-    enum CharacterCodes {
-        nullCharacter = 0,
-        maxAsciiCharacter = 127,
-        lineFeed = 10,
-        carriageReturn = 13,
-        lineSeparator = 8232,
-        paragraphSeparator = 8233,
-        nextLine = 133,
-        space = 32,
-        nonBreakingSpace = 160,
-        enQuad = 8192,
-        emQuad = 8193,
-        enSpace = 8194,
-        emSpace = 8195,
-        threePerEmSpace = 8196,
-        fourPerEmSpace = 8197,
-        sixPerEmSpace = 8198,
-        figureSpace = 8199,
-        punctuationSpace = 8200,
-        thinSpace = 8201,
-        hairSpace = 8202,
-        zeroWidthSpace = 8203,
-        narrowNoBreakSpace = 8239,
-        ideographicSpace = 12288,
-        mathematicalSpace = 8287,
-        ogham = 5760,
-        _ = 95,
-        $ = 36,
-        _0 = 48,
-        _1 = 49,
-        _2 = 50,
-        _3 = 51,
-        _4 = 52,
-        _5 = 53,
-        _6 = 54,
-        _7 = 55,
-        _8 = 56,
-        _9 = 57,
-        a = 97,
-        b = 98,
-        c = 99,
-        d = 100,
-        e = 101,
-        f = 102,
-        g = 103,
-        h = 104,
-        i = 105,
-        j = 106,
-        k = 107,
-        l = 108,
-        m = 109,
-        n = 110,
-        o = 111,
-        p = 112,
-        q = 113,
-        r = 114,
-        s = 115,
-        t = 116,
-        u = 117,
-        v = 118,
-        w = 119,
-        x = 120,
-        y = 121,
-        z = 122,
-        A = 65,
-        B = 66,
-        C = 67,
-        D = 68,
-        E = 69,
-        F = 70,
-        G = 71,
-        H = 72,
-        I = 73,
-        J = 74,
-        K = 75,
-        L = 76,
-        M = 77,
-        N = 78,
-        O = 79,
-        P = 80,
-        Q = 81,
-        R = 82,
-        S = 83,
-        T = 84,
-        U = 85,
-        V = 86,
-        W = 87,
-        X = 88,
-        Y = 89,
-        Z = 90,
-        ampersand = 38,
-        asterisk = 42,
-        at = 64,
-        backslash = 92,
-        backtick = 96,
-        bar = 124,
-        caret = 94,
-        closeBrace = 125,
-        closeBracket = 93,
-        closeParen = 41,
-        colon = 58,
-        comma = 44,
-        dot = 46,
-        doubleQuote = 34,
-        equals = 61,
-        exclamation = 33,
-        greaterThan = 62,
-        hash = 35,
-        lessThan = 60,
-        minus = 45,
-        openBrace = 123,
-        openBracket = 91,
-        openParen = 40,
-        percent = 37,
-        plus = 43,
-        question = 63,
-        semicolon = 59,
-        singleQuote = 39,
-        slash = 47,
-        tilde = 126,
-        backspace = 8,
-        formFeed = 12,
-        byteOrderMark = 65279,
-        tab = 9,
-        verticalTab = 11
-    }
-    interface ModuleResolutionHost {
-        fileExists(fileName: string): boolean;
-        readFile(fileName: string): string | undefined;
-        trace?(s: string): void;
-        directoryExists?(directoryName: string): boolean;
-        /**
-         * Resolve a symbolic link.
-         * @see https://nodejs.org/api/fs.html#fs_fs_realpathsync_path_options
-         */
-        realpath?(path: string): string;
-        getCurrentDirectory?(): string;
-        getDirectories?(path: string): string[];
-    }
-    /**
-     * Represents the result of module resolution.
-     * Module resolution will pick up tsx/jsx/js files even if '--jsx' and '--allowJs' are turned off.
-     * The Program will then filter results based on these flags.
-     *
-     * Prefer to return a `ResolvedModuleFull` so that the file type does not have to be inferred.
-     */
-    interface ResolvedModule {
-        /** Path of the file the module was resolved to. */
-        resolvedFileName: string;
-        /** True if `resolvedFileName` comes from `node_modules`. */
-        isExternalLibraryImport?: boolean;
-    }
-    /**
-     * ResolvedModule with an explicitly provided `extension` property.
-     * Prefer this over `ResolvedModule`.
-     * If changing this, remember to change `moduleResolutionIsEqualTo`.
-     */
-    interface ResolvedModuleFull extends ResolvedModule {
-        readonly originalPath?: string;
-        /**
-         * Extension of resolvedFileName. This must match what's at the end of resolvedFileName.
-         * This is optional for backwards-compatibility, but will be added if not provided.
-         */
-        extension: Extension;
-        packageId?: PackageId;
-    }
-    /**
-     * Unique identifier with a package name and version.
-     * If changing this, remember to change `packageIdIsEqual`.
-     */
-    interface PackageId {
-        /**
-         * Name of the package.
-         * Should not include `@types`.
-         * If accessing a non-index file, this should include its name e.g. "foo/bar".
-         */
-        name: string;
-        /**
-         * Name of a submodule within this package.
-         * May be "".
-         */
-        subModuleName: string;
-        /** Version of the package, e.g. "1.2.3" */
-        version: string;
-    }
-    enum Extension {
-        Ts = ".ts",
-        Tsx = ".tsx",
-        Dts = ".d.ts",
-        Js = ".js",
-        Jsx = ".jsx",
-        Json = ".json"
-    }
-    interface ResolvedModuleWithFailedLookupLocations {
-        readonly resolvedModule: ResolvedModuleFull | undefined;
-        readonly failedLookupLocations: ReadonlyArray<string>;
-    }
-    interface ResolvedTypeReferenceDirective {
-        primary: boolean;
-        resolvedFileName: string | undefined;
-        packageId?: PackageId;
-    }
-    interface ResolvedTypeReferenceDirectiveWithFailedLookupLocations {
-        readonly resolvedTypeReferenceDirective: ResolvedTypeReferenceDirective | undefined;
-        readonly failedLookupLocations: ReadonlyArray<string>;
-    }
-    type HasInvalidatedResolution = (sourceFile: Path) => boolean;
-    interface CompilerHost extends ModuleResolutionHost {
-        getSourceFile(fileName: string, languageVersion: ScriptTarget, onError?: (message: string) => void, shouldCreateNewSourceFile?: boolean): SourceFile | undefined;
-        getSourceFileByPath?(fileName: string, path: Path, languageVersion: ScriptTarget, onError?: (message: string) => void, shouldCreateNewSourceFile?: boolean): SourceFile | undefined;
-        getCancellationToken?(): CancellationToken;
-        getDefaultLibFileName(options: CompilerOptions): string;
-        getDefaultLibLocation?(): string;
-        writeFile: WriteFileCallback;
-        getCurrentDirectory(): string;
-        getDirectories(path: string): string[];
-        getCanonicalFileName(fileName: string): string;
-        useCaseSensitiveFileNames(): boolean;
-        getNewLine(): string;
-        readDirectory?(rootDir: string, extensions: ReadonlyArray<string>, excludes: ReadonlyArray<string> | undefined, includes: ReadonlyArray<string>, depth?: number): string[];
-        resolveModuleNames?(moduleNames: string[], containingFile: string, reusedNames?: string[]): (ResolvedModule | undefined)[];
-        /**
-         * This method is a companion for 'resolveModuleNames' and is used to resolve 'types' references to actual type declaration files
-         */
-        resolveTypeReferenceDirectives?(typeReferenceDirectiveNames: string[], containingFile: string): ResolvedTypeReferenceDirective[];
-        getEnvironmentVariable?(name: string): string | undefined;
-        onReleaseOldSourceFile?(oldSourceFile: SourceFile, oldOptions: CompilerOptions): void;
-        hasInvalidatedResolution?: HasInvalidatedResolution;
-        hasChangedAutomaticTypeDirectiveNames?: boolean;
-        createHash?(data: string): string;
-        getModifiedTime?(fileName: string): Date;
-        setModifiedTime?(fileName: string, date: Date): void;
-        deleteFile?(fileName: string): void;
-    }
-    enum TransformFlags {
-        None = 0,
-        TypeScript = 1,
-        ContainsTypeScript = 2,
-        ContainsJsx = 4,
-        ContainsESNext = 8,
-        ContainsES2017 = 16,
-        ContainsES2016 = 32,
-        ES2015 = 64,
-        ContainsES2015 = 128,
-        Generator = 256,
-        ContainsGenerator = 512,
-        DestructuringAssignment = 1024,
-        ContainsDestructuringAssignment = 2048,
-        ContainsDecorators = 4096,
-        ContainsPropertyInitializer = 8192,
-        ContainsLexicalThis = 16384,
-        ContainsCapturedLexicalThis = 32768,
-        ContainsLexicalThisInComputedPropertyName = 65536,
-        ContainsDefaultValueAssignments = 131072,
-        ContainsParameterPropertyAssignments = 262144,
-        ContainsSpread = 524288,
-        ContainsObjectSpread = 1048576,
-        ContainsRest = 524288,
-        ContainsObjectRest = 1048576,
-        ContainsComputedPropertyName = 2097152,
-        ContainsBlockScopedBinding = 4194304,
-        ContainsBindingPattern = 8388608,
-        ContainsYield = 16777216,
-        ContainsHoistedDeclarationOrCompletion = 33554432,
-        ContainsDynamicImport = 67108864,
-        Super = 134217728,
-        ContainsSuper = 268435456,
-        HasComputedFlags = 536870912,
-        AssertTypeScript = 3,
-        AssertJsx = 4,
-        AssertESNext = 8,
-        AssertES2017 = 16,
-        AssertES2016 = 32,
-        AssertES2015 = 192,
-        AssertGenerator = 768,
-        AssertDestructuringAssignment = 3072,
-        OuterExpressionExcludes = 536872257,
-        PropertyAccessExcludes = 671089985,
-        NodeExcludes = 939525441,
-        ArrowFunctionExcludes = 1003902273,
-        FunctionExcludes = 1003935041,
-        ConstructorExcludes = 1003668801,
-        MethodOrAccessorExcludes = 1003668801,
-        ClassExcludes = 942011713,
-        ModuleExcludes = 977327425,
-        TypeExcludes = -3,
-        ObjectLiteralExcludes = 942740801,
-        ArrayLiteralOrCallOrNewExcludes = 940049729,
-        VariableDeclarationListExcludes = 948962625,
-        ParameterExcludes = 939525441,
-        CatchClauseExcludes = 940574017,
-        BindingPatternExcludes = 940049729,
-        TypeScriptClassSyntaxMask = 274432,
-        ES2015FunctionSyntaxMask = 163840
-    }
-    interface SourceMapRange extends TextRange {
-        source?: SourceMapSource;
-    }
-    interface SourceMapSource {
-        fileName: string;
-        text: string;
-        lineMap: ReadonlyArray<number>;
-        skipTrivia?: (pos: number) => number;
-    }
-    interface EmitNode {
-        annotatedNodes?: Node[];
-        flags: EmitFlags;
-        leadingComments?: SynthesizedComment[];
-        trailingComments?: SynthesizedComment[];
-        commentRange?: TextRange;
-        sourceMapRange?: SourceMapRange;
-        tokenSourceMapRanges?: (SourceMapRange | undefined)[];
-        constantValue?: string | number;
-        externalHelpersModuleName?: Identifier;
-        helpers?: EmitHelper[];
-        startsOnNewLine?: boolean;
-    }
-    enum EmitFlags {
-        None = 0,
-        SingleLine = 1,
-        AdviseOnEmitNode = 2,
-        NoSubstitution = 4,
-        CapturesThis = 8,
-        NoLeadingSourceMap = 16,
-        NoTrailingSourceMap = 32,
-        NoSourceMap = 48,
-        NoNestedSourceMaps = 64,
-        NoTokenLeadingSourceMaps = 128,
-        NoTokenTrailingSourceMaps = 256,
-        NoTokenSourceMaps = 384,
-        NoLeadingComments = 512,
-        NoTrailingComments = 1024,
-        NoComments = 1536,
-        NoNestedComments = 2048,
-        HelperName = 4096,
-        ExportName = 8192,
-        LocalName = 16384,
-        InternalName = 32768,
-        Indented = 65536,
-        NoIndentation = 131072,
-        AsyncFunctionBody = 262144,
-        ReuseTempVariableScope = 524288,
-        CustomPrologue = 1048576,
-        NoHoisting = 2097152,
-        HasEndOfDeclarationMarker = 4194304,
-        Iterator = 8388608,
-        NoAsciiEscaping = 16777216,
-        TypeScriptClassWrapper = 33554432,
-        NeverApplyImportHelper = 67108864
-    }
-    interface EmitHelper {
-        readonly name: string;
-        readonly scoped: boolean;
-        readonly text: string | ((node: EmitHelperUniqueNameCallback) => string);
-        readonly priority?: number;
-    }
-    type UniqueNameHandler = (baseName: string, checkFn?: (name: string) => boolean, optimistic?: boolean) => string;
-    type EmitHelperUniqueNameCallback = (name: string) => string;
-    /**
-     * Used by the checker, this enum keeps track of external emit helpers that should be type
-     * checked.
-     */
-    enum ExternalEmitHelpers {
-        Extends = 1,
-        Assign = 2,
-        Rest = 4,
-        Decorate = 8,
-        Metadata = 16,
-        Param = 32,
-        Awaiter = 64,
-        Generator = 128,
-        Values = 256,
-        Read = 512,
-        Spread = 1024,
-        Await = 2048,
-        AsyncGenerator = 4096,
-        AsyncDelegator = 8192,
-        AsyncValues = 16384,
-        ExportStar = 32768,
-        MakeTemplateObject = 65536,
-        FirstEmitHelper = 1,
-        LastEmitHelper = 65536,
-        ForOfIncludes = 256,
-        ForAwaitOfIncludes = 16384,
-        AsyncGeneratorIncludes = 6144,
-        AsyncDelegatorIncludes = 26624,
-        SpreadIncludes = 1536
-    }
-    enum EmitHint {
-        SourceFile = 0,
-        Expression = 1,
-        IdentifierName = 2,
-        MappedTypeParameter = 3,
-        Unspecified = 4
-    }
-    interface EmitHost extends ScriptReferenceHost, ModuleSpecifierResolutionHost {
-        getSourceFiles(): ReadonlyArray<SourceFile>;
-        getCurrentDirectory(): string;
-        isSourceFileFromExternalLibrary(file: SourceFile): boolean;
-        getCommonSourceDirectory(): string;
-        getCanonicalFileName(fileName: string): string;
-        getNewLine(): string;
-        isEmitBlocked(emitFileName: string): boolean;
-        getPrependNodes(): ReadonlyArray<InputFiles>;
-        writeFile: WriteFileCallback;
-    }
-    interface TransformationContext {
-        getEmitResolver(): EmitResolver;
-        getEmitHost(): EmitHost;
-        /** Gets the compiler options supplied to the transformer. */
-        getCompilerOptions(): CompilerOptions;
-        /** Starts a new lexical environment. */
-        startLexicalEnvironment(): void;
-        /** Suspends the current lexical environment, usually after visiting a parameter list. */
-        suspendLexicalEnvironment(): void;
-        /** Resumes a suspended lexical environment, usually before visiting a function body. */
-        resumeLexicalEnvironment(): void;
-        /** Ends a lexical environment, returning any declarations. */
-        endLexicalEnvironment(): Statement[] | undefined;
-        /** Hoists a function declaration to the containing scope. */
-        hoistFunctionDeclaration(node: FunctionDeclaration): void;
-        /** Hoists a variable declaration to the containing scope. */
-        hoistVariableDeclaration(node: Identifier): void;
-        /** Records a request for a non-scoped emit helper in the current context. */
-        requestEmitHelper(helper: EmitHelper): void;
-        /** Gets and resets the requested non-scoped emit helpers. */
-        readEmitHelpers(): EmitHelper[] | undefined;
-        /** Enables expression substitutions in the pretty printer for the provided SyntaxKind. */
-        enableSubstitution(kind: SyntaxKind): void;
-        /** Determines whether expression substitutions are enabled for the provided node. */
-        isSubstitutionEnabled(node: Node): boolean;
-        /**
-         * Hook used by transformers to substitute expressions just before they
-         * are emitted by the pretty printer.
-         *
-         * NOTE: Transformation hooks should only be modified during `Transformer` initialization,
-         * before returning the `NodeTransformer` callback.
-         */
-        onSubstituteNode: (hint: EmitHint, node: Node) => Node;
-        /**
-         * Enables before/after emit notifications in the pretty printer for the provided
-         * SyntaxKind.
-         */
-        enableEmitNotification(kind: SyntaxKind): void;
-        /**
-         * Determines whether before/after emit notifications should be raised in the pretty
-         * printer when it emits a node.
-         */
-        isEmitNotificationEnabled(node: Node): boolean;
-        /**
-         * Hook used to allow transformers to capture state before or after
-         * the printer emits a node.
-         *
-         * NOTE: Transformation hooks should only be modified during `Transformer` initialization,
-         * before returning the `NodeTransformer` callback.
-         */
-        onEmitNode: (hint: EmitHint, node: Node, emitCallback: (hint: EmitHint, node: Node) => void) => void;
-        addDiagnostic(diag: DiagnosticWithLocation): void;
-    }
-    interface TransformationResult<T extends Node> {
-        /** Gets the transformed source files. */
-        transformed: T[];
-        /** Gets diagnostics for the transformation. */
-        diagnostics?: DiagnosticWithLocation[];
-        /**
-         * Gets a substitute for a node, if one is available; otherwise, returns the original node.
-         *
-         * @param hint A hint as to the intended usage of the node.
-         * @param node The node to substitute.
-         */
-        substituteNode(hint: EmitHint, node: Node): Node;
-        /**
-         * Emits a node with possible notification.
-         *
-         * @param hint A hint as to the intended usage of the node.
-         * @param node The node to emit.
-         * @param emitCallback A callback used to emit the node.
-         */
-        emitNodeWithNotification(hint: EmitHint, node: Node, emitCallback: (hint: EmitHint, node: Node) => void): void;
-        /**
-         * Clean up EmitNode entries on any parse-tree nodes.
-         */
-        dispose(): void;
-    }
-    /**
-     * A function that is used to initialize and return a `Transformer` callback, which in turn
-     * will be used to transform one or more nodes.
-     */
-    type TransformerFactory<T extends Node> = (context: TransformationContext) => Transformer<T>;
-    /**
-     * A function that transforms a node.
-     */
-    type Transformer<T extends Node> = (node: T) => T;
-    /**
-     * A function that accepts and possibly transforms a node.
-     */
-    type Visitor = (node: Node) => VisitResult<Node>;
-    type VisitResult<T extends Node> = T | T[] | undefined;
-    interface Printer {
-        /**
-         * Print a node and its subtree as-is, without any emit transformations.
-         * @param hint A value indicating the purpose of a node. This is primarily used to
-         * distinguish between an `Identifier` used in an expression position, versus an
-         * `Identifier` used as an `IdentifierName` as part of a declaration. For most nodes you
-         * should just pass `Unspecified`.
-         * @param node The node to print. The node and its subtree are printed as-is, without any
-         * emit transformations.
-         * @param sourceFile A source file that provides context for the node. The source text of
-         * the file is used to emit the original source content for literals and identifiers, while
-         * the identifiers of the source file are used when generating unique names to avoid
-         * collisions.
-         */
-        printNode(hint: EmitHint, node: Node, sourceFile: SourceFile): string;
-        /**
-         * Prints a list of nodes using the given format flags
-         */
-        printList<T extends Node>(format: ListFormat, list: NodeArray<T>, sourceFile: SourceFile): string;
-        /**
-         * Prints a source file as-is, without any emit transformations.
-         */
-        printFile(sourceFile: SourceFile): string;
-        /**
-         * Prints a bundle of source files as-is, without any emit transformations.
-         */
-        printBundle(bundle: Bundle): string;
-        writeNode(hint: EmitHint, node: Node, sourceFile: SourceFile | undefined, writer: EmitTextWriter): void;
-        writeList<T extends Node>(format: ListFormat, list: NodeArray<T> | undefined, sourceFile: SourceFile | undefined, writer: EmitTextWriter): void;
-        writeFile(sourceFile: SourceFile, writer: EmitTextWriter): void;
-        writeBundle(bundle: Bundle, writer: EmitTextWriter, info?: BundleInfo): void;
-    }
-    /**
-     * When a bundle contains prepended content, we store a file on disk indicating where the non-prepended
-     * content of that file starts. On a subsequent build where there are no upstream .d.ts changes, we
-     * read the bundle info file and the original .js file to quickly re-use portion of the file
-     * that didn't originate in prepended content.
-     */
-    interface BundleInfo {
-        originalOffset: number;
-        totalLength: number;
-    }
-    interface PrintHandlers {
-        /**
-         * A hook used by the Printer when generating unique names to avoid collisions with
-         * globally defined names that exist outside of the current source file.
-         */
-        hasGlobalName?(name: string): boolean;
-        /**
-         * A hook used by the Printer to provide notifications prior to emitting a node. A
-         * compatible implementation **must** invoke `emitCallback` with the provided `hint` and
-         * `node` values.
-         * @param hint A hint indicating the intended purpose of the node.
-         * @param node The node to emit.
-         * @param emitCallback A callback that, when invoked, will emit the node.
-         * @example
-         * ```ts
-         * var printer = createPrinter(printerOptions, {
-         *   onEmitNode(hint, node, emitCallback) {
-         *     // set up or track state prior to emitting the node...
-         *     emitCallback(hint, node);
-         *     // restore state after emitting the node...
-         *   }
-         * });
-         * ```
-         */
-        onEmitNode?(hint: EmitHint, node: Node | undefined, emitCallback: (hint: EmitHint, node: Node | undefined) => void): void;
-        /**
-         * A hook used by the Printer to perform just-in-time substitution of a node. This is
-         * primarily used by node transformations that need to substitute one node for another,
-         * such as replacing `myExportedVar` with `exports.myExportedVar`.
-         * @param hint A hint indicating the intended purpose of the node.
-         * @param node The node to emit.
-         * @example
-         * ```ts
-         * var printer = createPrinter(printerOptions, {
-         *   substituteNode(hint, node) {
-         *     // perform substitution if necessary...
-         *     return node;
-         *   }
-         * });
-         * ```
-         */
-        substituteNode?(hint: EmitHint, node: Node): Node;
-        onEmitSourceMapOfNode?: (hint: EmitHint, node: Node, emitCallback: (hint: EmitHint, node: Node) => void) => void;
-        onEmitSourceMapOfToken?: (node: Node | undefined, token: SyntaxKind, writer: (s: string) => void, pos: number, emitCallback: (token: SyntaxKind, writer: (s: string) => void, pos: number) => number) => number;
-        onEmitSourceMapOfPosition?: (pos: number) => void;
-        onSetSourceFile?: (node: SourceFile) => void;
-        onBeforeEmitNodeArray?: (nodes: NodeArray<any> | undefined) => void;
-        onAfterEmitNodeArray?: (nodes: NodeArray<any> | undefined) => void;
-        onBeforeEmitToken?: (node: Node) => void;
-        onAfterEmitToken?: (node: Node) => void;
-    }
-    interface PrinterOptions {
-        removeComments?: boolean;
-        newLine?: NewLineKind;
-        omitTrailingSemicolon?: boolean;
-        noEmitHelpers?: boolean;
-        module?: CompilerOptions["module"];
-        target?: CompilerOptions["target"];
-        sourceMap?: boolean;
-        inlineSourceMap?: boolean;
-        extendedDiagnostics?: boolean;
-        onlyPrintJsDocStyle?: boolean;
-    }
-    interface EmitTextWriter extends SymbolWriter {
-        write(s: string): void;
-        writeTextOfNode(text: string, node: Node): void;
-        getText(): string;
-        rawWrite(s: string): void;
-        writeLiteral(s: string): void;
-        getTextPos(): number;
-        getLine(): number;
-        getColumn(): number;
-        getIndent(): number;
-        isAtStartOfLine(): boolean;
-    }
-    interface GetEffectiveTypeRootsHost {
-        directoryExists?(directoryName: string): boolean;
-        getCurrentDirectory?(): string;
-    }
-    /** @internal */
-    interface ModuleSpecifierResolutionHost extends GetEffectiveTypeRootsHost {
-        useCaseSensitiveFileNames?(): boolean;
-        fileExists?(path: string): boolean;
-        readFile?(path: string): string | undefined;
-    }
-    /** @deprecated See comment on SymbolWriter */
-    interface SymbolTracker {
-        trackSymbol?(symbol: Symbol, enclosingDeclaration?: Node, meaning?: SymbolFlags): void;
-        reportInaccessibleThisError?(): void;
-        reportPrivateInBaseOfClassExpression?(propertyName: string): void;
-        reportInaccessibleUniqueSymbolError?(): void;
-        moduleResolverHost?: ModuleSpecifierResolutionHost;
-        trackReferencedAmbientModule?(decl: ModuleDeclaration): void;
-    }
-    interface TextSpan {
-        start: number;
-        length: number;
-    }
-    interface TextChangeRange {
-        span: TextSpan;
-        newLength: number;
-    }
-    interface DiagnosticCollection {
-        add(diagnostic: Diagnostic): void;
-        getGlobalDiagnostics(): Diagnostic[];
-        getDiagnostics(fileName: string): DiagnosticWithLocation[];
-        getDiagnostics(): Diagnostic[];
-        reattachFileDiagnostics(newFile: SourceFile): void;
-    }
-    interface SyntaxList extends Node {
-        _children: Node[];
-    }
-    enum ListFormat {
-        None = 0,
-        SingleLine = 0,
-        MultiLine = 1,
-        PreserveLines = 2,
-        LinesMask = 3,
-        NotDelimited = 0,
-        BarDelimited = 4,
-        AmpersandDelimited = 8,
-        CommaDelimited = 16,
-        DelimitersMask = 28,
-        AllowTrailingComma = 32,
-        Indented = 64,
-        SpaceBetweenBraces = 128,
-        SpaceBetweenSiblings = 256,
-        Braces = 512,
-        Parenthesis = 1024,
-        AngleBrackets = 2048,
-        SquareBrackets = 4096,
-        BracketsMask = 7680,
-        OptionalIfUndefined = 8192,
-        OptionalIfEmpty = 16384,
-        Optional = 24576,
-        PreferNewLine = 32768,
-        NoTrailingNewLine = 65536,
-        NoInterveningComments = 131072,
-        NoSpaceIfEmpty = 262144,
-        SingleElement = 524288,
-        Modifiers = 131328,
-        HeritageClauses = 256,
-        SingleLineTypeLiteralMembers = 384,
-        MultiLineTypeLiteralMembers = 16449,
-        TupleTypeElements = 272,
-        UnionTypeConstituents = 260,
-        IntersectionTypeConstituents = 264,
-        ObjectBindingPatternElements = 262576,
-        ArrayBindingPatternElements = 262448,
-        ObjectLiteralExpressionProperties = 263122,
-        ArrayLiteralExpressionElements = 4466,
-        CommaListElements = 272,
-        CallExpressionArguments = 1296,
-        NewExpressionArguments = 9488,
-        TemplateExpressionSpans = 131072,
-        SingleLineBlockStatements = 384,
-        MultiLineBlockStatements = 65,
-        VariableDeclarationList = 272,
-        SingleLineFunctionBodyStatements = 384,
-        MultiLineFunctionBodyStatements = 1,
-        ClassHeritageClauses = 0,
-        ClassMembers = 65,
-        InterfaceMembers = 65,
-        EnumMembers = 81,
-        CaseBlockClauses = 65,
-        NamedImportsOrExportsElements = 262576,
-        JsxElementOrFragmentChildren = 131072,
-        JsxElementAttributes = 131328,
-        CaseOrDefaultClauseStatements = 81985,
-        HeritageClauseTypes = 272,
-        SourceFileStatements = 65537,
-        Decorators = 24577,
-        TypeArguments = 26896,
-        TypeParameters = 26896,
-        Parameters = 1296,
-        IndexSignatureParameters = 4432
-    }
-    enum PragmaKindFlags {
-        None = 0,
-        /**
-         * Triple slash comment of the form
-         * /// <pragma-name argname="value" />
-         */
-        TripleSlashXML = 1,
-        /**
-         * Single line comment of the form
-         * // @pragma-name argval1 argval2
-         * or
-         * /// @pragma-name argval1 argval2
-         */
-        SingleLine = 2,
-        /**
-         * Multiline non-jsdoc pragma of the form
-         * /* @pragma-name argval1 argval2 * /
-         */
-        MultiLine = 4,
-        All = 7,
-        Default = 7
-    }
-    interface PragmaArgumentSpecification<TName extends string> {
-        name: TName;
-        optional?: boolean;
-        captureSpan?: boolean;
-    }
-    interface PragmaDefinition<T1 extends string = string, T2 extends string = string, T3 extends string = string, T4 extends string = string> {
-        args?: [PragmaArgumentSpecification<T1>] | [PragmaArgumentSpecification<T1>, PragmaArgumentSpecification<T2>] | [PragmaArgumentSpecification<T1>, PragmaArgumentSpecification<T2>, PragmaArgumentSpecification<T3>] | [PragmaArgumentSpecification<T1>, PragmaArgumentSpecification<T2>, PragmaArgumentSpecification<T3>, PragmaArgumentSpecification<T4>];
-        kind?: PragmaKindFlags;
-    }
-    const commentPragmas: {
-        "reference": {
-            args: [{
-                name: "types";
-                optional: true;
-                captureSpan: true;
-            }, {
-                name: "lib";
-                optional: true;
-                captureSpan: true;
-            }, {
-                name: "path";
-                optional: true;
-                captureSpan: true;
-            }, {
-                name: "no-default-lib";
-                optional: true;
-            }];
-            kind: PragmaKindFlags;
-        };
-        "amd-dependency": {
-            args: [{
-                name: "path";
-            }, {
-                name: "name";
-                optional: true;
-            }];
-            kind: PragmaKindFlags;
-        };
-        "amd-module": {
-            args: [{
-                name: "name";
-            }];
-            kind: PragmaKindFlags;
-        };
-        "ts-check": {
-            kind: PragmaKindFlags;
-        };
-        "ts-nocheck": {
-            kind: PragmaKindFlags;
-        };
-        "jsx": {
-            args: [{
-                name: "factory";
-            }];
-            kind: PragmaKindFlags;
-        };
-    };
-    type PragmaArgTypeMaybeCapture<TDesc> = TDesc extends {
-        captureSpan: true;
-    } ? {
-        value: string;
-        pos: number;
-        end: number;
-    } : string;
-    type PragmaArgTypeOptional<TDesc, TName extends string> = TDesc extends {
-        optional: true;
-    } ? {
-        [K in TName]?: PragmaArgTypeMaybeCapture<TDesc>;
-    } : {
-        [K in TName]: PragmaArgTypeMaybeCapture<TDesc>;
-    };
-    /**
-     * Maps a pragma definition into the desired shape for its arguments object
-     * Maybe the below is a good argument for types being iterable on struture in some way.
-     */
-    type PragmaArgumentType<T extends PragmaDefinition> = T extends {
-        args: [PragmaArgumentSpecification<infer TName1>, PragmaArgumentSpecification<infer TName2>, PragmaArgumentSpecification<infer TName3>, PragmaArgumentSpecification<infer TName4>];
-    } ? PragmaArgTypeOptional<T["args"][0], TName1> & PragmaArgTypeOptional<T["args"][1], TName2> & PragmaArgTypeOptional<T["args"][2], TName3> & PragmaArgTypeOptional<T["args"][2], TName4> : T extends {
-        args: [PragmaArgumentSpecification<infer TName1>, PragmaArgumentSpecification<infer TName2>, PragmaArgumentSpecification<infer TName3>];
-    } ? PragmaArgTypeOptional<T["args"][0], TName1> & PragmaArgTypeOptional<T["args"][1], TName2> & PragmaArgTypeOptional<T["args"][2], TName3> : T extends {
-        args: [PragmaArgumentSpecification<infer TName1>, PragmaArgumentSpecification<infer TName2>];
-    } ? PragmaArgTypeOptional<T["args"][0], TName1> & PragmaArgTypeOptional<T["args"][1], TName2> : T extends {
-        args: [PragmaArgumentSpecification<infer TName>];
-    } ? PragmaArgTypeOptional<T["args"][0], TName> : object;
-    type ConcretePragmaSpecs = typeof commentPragmas;
-    type PragmaPsuedoMap = {
-        [K in keyof ConcretePragmaSpecs]?: {
-            arguments: PragmaArgumentType<ConcretePragmaSpecs[K]>;
-            range: CommentRange;
-        };
-    };
-    type PragmaPsuedoMapEntry = {
-        [K in keyof PragmaPsuedoMap]: {
-            name: K;
-            args: PragmaPsuedoMap[K];
-        };
-    }[keyof PragmaPsuedoMap];
-    /**
-     * A strongly-typed es6 map of pragma entries, the values of which are either a single argument
-     * value (if only one was found), or an array of multiple argument values if the pragma is present
-     * in multiple places
-     */
-    interface PragmaMap extends Map<PragmaPsuedoMap[keyof PragmaPsuedoMap] | PragmaPsuedoMap[keyof PragmaPsuedoMap][]> {
-        set<TKey extends keyof PragmaPsuedoMap>(key: TKey, value: PragmaPsuedoMap[TKey] | PragmaPsuedoMap[TKey][]): this;
-        get<TKey extends keyof PragmaPsuedoMap>(key: TKey): PragmaPsuedoMap[TKey] | PragmaPsuedoMap[TKey][];
-        forEach(action: <TKey extends keyof PragmaPsuedoMap>(value: PragmaPsuedoMap[TKey] | PragmaPsuedoMap[TKey][], key: TKey) => void): void;
-    }
-}
-declare function setTimeout(handler: (...args: any[]) => void, timeout: number): any;
-declare function clearTimeout(handle: any): void;
-declare namespace ts {
-    /**
-     * Set a high stack trace limit to provide more information in case of an error.
-     * Called for command-line and server use cases.
-     * Not called if TypeScript is used as a library.
-     */
-    function setStackTraceLimit(): void;
-    enum FileWatcherEventKind {
-        Created = 0,
-        Changed = 1,
-        Deleted = 2
-    }
-    type FileWatcherCallback = (fileName: string, eventKind: FileWatcherEventKind) => void;
-    type DirectoryWatcherCallback = (fileName: string) => void;
-    interface WatchedFile {
-        readonly fileName: string;
-        readonly callback: FileWatcherCallback;
-        mtime: Date;
-    }
-    enum PollingInterval {
-        High = 2000,
-        Medium = 500,
-        Low = 250
-    }
-    function watchFileUsingPriorityPollingInterval(host: System, fileName: string, callback: FileWatcherCallback, watchPriority: PollingInterval): FileWatcher;
-    type HostWatchFile = (fileName: string, callback: FileWatcherCallback, pollingInterval: PollingInterval | undefined) => FileWatcher;
-    type HostWatchDirectory = (fileName: string, callback: DirectoryWatcherCallback, recursive?: boolean) => FileWatcher;
-    const missingFileModifiedTime: Date;
-    let unchangedPollThresholds: {
-        [PollingInterval.Low]: number;
-        [PollingInterval.Medium]: number;
-        [PollingInterval.High]: number;
-    };
-    function setCustomPollingValues(system: System): void;
-    function createDynamicPriorityPollingWatchFile(host: {
-        getModifiedTime: System["getModifiedTime"];
-        setTimeout: System["setTimeout"];
-    }): HostWatchFile;
-    /**
-     * Returns true if file status changed
-     */
-    function onWatchedFileStat(watchedFile: WatchedFile, modifiedTime: Date): boolean;
-    interface RecursiveDirectoryWatcherHost {
-        watchDirectory: HostWatchDirectory;
-        getAccessibleSortedChildDirectories(path: string): ReadonlyArray<string>;
-        directoryExists(dir: string): boolean;
-        filePathComparer: Comparer<string>;
-        realpath(s: string): string;
-    }
-    /**
-     * Watch the directory recursively using host provided method to watch child directories
-     * that means if this is recursive watcher, watch the children directories as well
-     * (eg on OS that dont support recursive watch using fs.watch use fs.watchFile)
-     */
-    function createRecursiveDirectoryWatcher(host: RecursiveDirectoryWatcherHost): (directoryName: string, callback: DirectoryWatcherCallback) => FileWatcher;
-    interface System {
-        args: string[];
-        newLine: string;
-        useCaseSensitiveFileNames: boolean;
-        write(s: string): void;
-        writeOutputIsTTY?(): boolean;
-        readFile(path: string, encoding?: string): string | undefined;
-        getFileSize?(path: string): number;
-        writeFile(path: string, data: string, writeByteOrderMark?: boolean): void;
-        /**
-         * @pollingInterval - this parameter is used in polling-based watchers and ignored in watchers that
-         * use native OS file watching
-         */
-        watchFile?(path: string, callback: FileWatcherCallback, pollingInterval?: number): FileWatcher;
-        watchDirectory?(path: string, callback: DirectoryWatcherCallback, recursive?: boolean): FileWatcher;
-        resolvePath(path: string): string;
-        fileExists(path: string): boolean;
-        directoryExists(path: string): boolean;
-        createDirectory(path: string): void;
-        getExecutingFilePath(): string;
-        getCurrentDirectory(): string;
-        getDirectories(path: string): string[];
-        readDirectory(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
-        getModifiedTime?(path: string): Date;
-        setModifiedTime?(path: string, time: Date): void;
-        deleteFile?(path: string): void;
-        /**
-         * A good implementation is node.js' `crypto.createHash`. (https://nodejs.org/api/crypto.html#crypto_crypto_createhash_algorithm)
-         */
-        createHash?(data: string): string;
-        /** This must be cryptographically secure. Only implement this method using `crypto.createHash("sha256")`. */
-        createSHA256Hash?(data: string): string;
-        getMemoryUsage?(): number;
-        exit(exitCode?: number): void;
-        realpath?(path: string): string;
-        getEnvironmentVariable(name: string): string;
-        tryEnableSourceMapsForHost?(): void;
-        debugMode?: boolean;
-        setTimeout?(callback: (...args: any[]) => void, ms: number, ...args: any[]): any;
-        clearTimeout?(timeoutId: any): void;
-        clearScreen?(): void;
-        setBlocking?(): void;
-        base64decode?(input: string): string;
-        base64encode?(input: string): string;
-    }
-    interface FileWatcher {
-        close(): void;
-    }
-    function getNodeMajorVersion(): number | undefined;
-    let sys: System;
-}
-declare namespace ts {
-    const Diagnostics: {
-        Unterminated_string_literal: DiagnosticMessage;
-        Identifier_expected: DiagnosticMessage;
-        _0_expected: DiagnosticMessage;
-        A_file_cannot_have_a_reference_to_itself: DiagnosticMessage;
-        Trailing_comma_not_allowed: DiagnosticMessage;
-        Asterisk_Slash_expected: DiagnosticMessage;
-        An_element_access_expression_should_take_an_argument: DiagnosticMessage;
-        Unexpected_token: DiagnosticMessage;
-        A_rest_parameter_or_binding_pattern_may_not_have_a_trailing_comma: DiagnosticMessage;
-        A_rest_parameter_must_be_last_in_a_parameter_list: DiagnosticMessage;
-        Parameter_cannot_have_question_mark_and_initializer: DiagnosticMessage;
-        A_required_parameter_cannot_follow_an_optional_parameter: DiagnosticMessage;
-        An_index_signature_cannot_have_a_rest_parameter: DiagnosticMessage;
-        An_index_signature_parameter_cannot_have_an_accessibility_modifier: DiagnosticMessage;
-        An_index_signature_parameter_cannot_have_a_question_mark: DiagnosticMessage;
-        An_index_signature_parameter_cannot_have_an_initializer: DiagnosticMessage;
-        An_index_signature_must_have_a_type_annotation: DiagnosticMessage;
-        An_index_signature_parameter_must_have_a_type_annotation: DiagnosticMessage;
-        An_index_signature_parameter_type_must_be_string_or_number: DiagnosticMessage;
-        readonly_modifier_can_only_appear_on_a_property_declaration_or_index_signature: DiagnosticMessage;
-        Accessibility_modifier_already_seen: DiagnosticMessage;
-        _0_modifier_must_precede_1_modifier: DiagnosticMessage;
-        _0_modifier_already_seen: DiagnosticMessage;
-        _0_modifier_cannot_appear_on_a_class_element: DiagnosticMessage;
-        super_must_be_followed_by_an_argument_list_or_member_access: DiagnosticMessage;
-        Only_ambient_modules_can_use_quoted_names: DiagnosticMessage;
-        Statements_are_not_allowed_in_ambient_contexts: DiagnosticMessage;
-        A_declare_modifier_cannot_be_used_in_an_already_ambient_context: DiagnosticMessage;
-        Initializers_are_not_allowed_in_ambient_contexts: DiagnosticMessage;
-        _0_modifier_cannot_be_used_in_an_ambient_context: DiagnosticMessage;
-        _0_modifier_cannot_be_used_with_a_class_declaration: DiagnosticMessage;
-        _0_modifier_cannot_be_used_here: DiagnosticMessage;
-        _0_modifier_cannot_appear_on_a_data_property: DiagnosticMessage;
-        _0_modifier_cannot_appear_on_a_module_or_namespace_element: DiagnosticMessage;
-        A_0_modifier_cannot_be_used_with_an_interface_declaration: DiagnosticMessage;
-        A_declare_modifier_is_required_for_a_top_level_declaration_in_a_d_ts_file: DiagnosticMessage;
-        A_rest_parameter_cannot_be_optional: DiagnosticMessage;
-        A_rest_parameter_cannot_have_an_initializer: DiagnosticMessage;
-        A_set_accessor_must_have_exactly_one_parameter: DiagnosticMessage;
-        A_set_accessor_cannot_have_an_optional_parameter: DiagnosticMessage;
-        A_set_accessor_parameter_cannot_have_an_initializer: DiagnosticMessage;
-        A_set_accessor_cannot_have_rest_parameter: DiagnosticMessage;
-        A_get_accessor_cannot_have_parameters: DiagnosticMessage;
-        Type_0_is_not_a_valid_async_function_return_type_in_ES5_SlashES3_because_it_does_not_refer_to_a_Promise_compatible_constructor_value: DiagnosticMessage;
-        Accessors_are_only_available_when_targeting_ECMAScript_5_and_higher: DiagnosticMessage;
-        An_async_function_or_method_must_have_a_valid_awaitable_return_type: DiagnosticMessage;
-        The_return_type_of_an_async_function_must_either_be_a_valid_promise_or_must_not_contain_a_callable_then_member: DiagnosticMessage;
-        A_promise_must_have_a_then_method: DiagnosticMessage;
-        The_first_parameter_of_the_then_method_of_a_promise_must_be_a_callback: DiagnosticMessage;
-        Enum_member_must_have_initializer: DiagnosticMessage;
-        Type_is_referenced_directly_or_indirectly_in_the_fulfillment_callback_of_its_own_then_method: DiagnosticMessage;
-        An_export_assignment_cannot_be_used_in_a_namespace: DiagnosticMessage;
-        The_return_type_of_an_async_function_or_method_must_be_the_global_Promise_T_type: DiagnosticMessage;
-        In_ambient_enum_declarations_member_initializer_must_be_constant_expression: DiagnosticMessage;
-        Unexpected_token_A_constructor_method_accessor_or_property_was_expected: DiagnosticMessage;
-        Unexpected_token_A_type_parameter_name_was_expected_without_curly_braces: DiagnosticMessage;
-        _0_modifier_cannot_appear_on_a_type_member: DiagnosticMessage;
-        _0_modifier_cannot_appear_on_an_index_signature: DiagnosticMessage;
-        A_0_modifier_cannot_be_used_with_an_import_declaration: DiagnosticMessage;
-        Invalid_reference_directive_syntax: DiagnosticMessage;
-        Octal_literals_are_not_available_when_targeting_ECMAScript_5_and_higher_Use_the_syntax_0: DiagnosticMessage;
-        An_accessor_cannot_be_declared_in_an_ambient_context: DiagnosticMessage;
-        _0_modifier_cannot_appear_on_a_constructor_declaration: DiagnosticMessage;
-        _0_modifier_cannot_appear_on_a_parameter: DiagnosticMessage;
-        Only_a_single_variable_declaration_is_allowed_in_a_for_in_statement: DiagnosticMessage;
-        Type_parameters_cannot_appear_on_a_constructor_declaration: DiagnosticMessage;
-        Type_annotation_cannot_appear_on_a_constructor_declaration: DiagnosticMessage;
-        An_accessor_cannot_have_type_parameters: DiagnosticMessage;
-        A_set_accessor_cannot_have_a_return_type_annotation: DiagnosticMessage;
-        An_index_signature_must_have_exactly_one_parameter: DiagnosticMessage;
-        _0_list_cannot_be_empty: DiagnosticMessage;
-        Type_parameter_list_cannot_be_empty: DiagnosticMessage;
-        Type_argument_list_cannot_be_empty: DiagnosticMessage;
-        Invalid_use_of_0_in_strict_mode: DiagnosticMessage;
-        with_statements_are_not_allowed_in_strict_mode: DiagnosticMessage;
-        delete_cannot_be_called_on_an_identifier_in_strict_mode: DiagnosticMessage;
-        A_for_await_of_statement_is_only_allowed_within_an_async_function_or_async_generator: DiagnosticMessage;
-        A_continue_statement_can_only_be_used_within_an_enclosing_iteration_statement: DiagnosticMessage;
-        A_break_statement_can_only_be_used_within_an_enclosing_iteration_or_switch_statement: DiagnosticMessage;
-        Jump_target_cannot_cross_function_boundary: DiagnosticMessage;
-        A_return_statement_can_only_be_used_within_a_function_body: DiagnosticMessage;
-        Expression_expected: DiagnosticMessage;
-        Type_expected: DiagnosticMessage;
-        A_default_clause_cannot_appear_more_than_once_in_a_switch_statement: DiagnosticMessage;
-        Duplicate_label_0: DiagnosticMessage;
-        A_continue_statement_can_only_jump_to_a_label_of_an_enclosing_iteration_statement: DiagnosticMessage;
-        A_break_statement_can_only_jump_to_a_label_of_an_enclosing_statement: DiagnosticMessage;
-        An_object_literal_cannot_have_multiple_properties_with_the_same_name_in_strict_mode: DiagnosticMessage;
-        An_object_literal_cannot_have_multiple_get_Slashset_accessors_with_the_same_name: DiagnosticMessage;
-        An_object_literal_cannot_have_property_and_accessor_with_the_same_name: DiagnosticMessage;
-        An_export_assignment_cannot_have_modifiers: DiagnosticMessage;
-        Octal_literals_are_not_allowed_in_strict_mode: DiagnosticMessage;
-        A_tuple_type_element_list_cannot_be_empty: DiagnosticMessage;
-        Variable_declaration_list_cannot_be_empty: DiagnosticMessage;
-        Digit_expected: DiagnosticMessage;
-        Hexadecimal_digit_expected: DiagnosticMessage;
-        Unexpected_end_of_text: DiagnosticMessage;
-        Invalid_character: DiagnosticMessage;
-        Declaration_or_statement_expected: DiagnosticMessage;
-        Statement_expected: DiagnosticMessage;
-        case_or_default_expected: DiagnosticMessage;
-        Property_or_signature_expected: DiagnosticMessage;
-        Enum_member_expected: DiagnosticMessage;
-        Variable_declaration_expected: DiagnosticMessage;
-        Argument_expression_expected: DiagnosticMessage;
-        Property_assignment_expected: DiagnosticMessage;
-        Expression_or_comma_expected: DiagnosticMessage;
-        Parameter_declaration_expected: DiagnosticMessage;
-        Type_parameter_declaration_expected: DiagnosticMessage;
-        Type_argument_expected: DiagnosticMessage;
-        String_literal_expected: DiagnosticMessage;
-        Line_break_not_permitted_here: DiagnosticMessage;
-        or_expected: DiagnosticMessage;
-        Declaration_expected: DiagnosticMessage;
-        Import_declarations_in_a_namespace_cannot_reference_a_module: DiagnosticMessage;
-        Cannot_use_imports_exports_or_module_augmentations_when_module_is_none: DiagnosticMessage;
-        File_name_0_differs_from_already_included_file_name_1_only_in_casing: DiagnosticMessage;
-        new_T_cannot_be_used_to_create_an_array_Use_new_Array_T_instead: DiagnosticMessage;
-        const_declarations_must_be_initialized: DiagnosticMessage;
-        const_declarations_can_only_be_declared_inside_a_block: DiagnosticMessage;
-        let_declarations_can_only_be_declared_inside_a_block: DiagnosticMessage;
-        Unterminated_template_literal: DiagnosticMessage;
-        Unterminated_regular_expression_literal: DiagnosticMessage;
-        An_object_member_cannot_be_declared_optional: DiagnosticMessage;
-        A_yield_expression_is_only_allowed_in_a_generator_body: DiagnosticMessage;
-        Computed_property_names_are_not_allowed_in_enums: DiagnosticMessage;
-        A_computed_property_name_in_an_ambient_context_must_refer_to_an_expression_whose_type_is_a_literal_type_or_a_unique_symbol_type: DiagnosticMessage;
-        A_computed_property_name_in_a_class_property_declaration_must_refer_to_an_expression_whose_type_is_a_literal_type_or_a_unique_symbol_type: DiagnosticMessage;
-        A_computed_property_name_in_a_method_overload_must_refer_to_an_expression_whose_type_is_a_literal_type_or_a_unique_symbol_type: DiagnosticMessage;
-        A_computed_property_name_in_an_interface_must_refer_to_an_expression_whose_type_is_a_literal_type_or_a_unique_symbol_type: DiagnosticMessage;
-        A_computed_property_name_in_a_type_literal_must_refer_to_an_expression_whose_type_is_a_literal_type_or_a_unique_symbol_type: DiagnosticMessage;
-        A_comma_expression_is_not_allowed_in_a_computed_property_name: DiagnosticMessage;
-        extends_clause_already_seen: DiagnosticMessage;
-        extends_clause_must_precede_implements_clause: DiagnosticMessage;
-        Classes_can_only_extend_a_single_class: DiagnosticMessage;
-        implements_clause_already_seen: DiagnosticMessage;
-        Interface_declaration_cannot_have_implements_clause: DiagnosticMessage;
-        Binary_digit_expected: DiagnosticMessage;
-        Octal_digit_expected: DiagnosticMessage;
-        Unexpected_token_expected: DiagnosticMessage;
-        Property_destructuring_pattern_expected: DiagnosticMessage;
-        Array_element_destructuring_pattern_expected: DiagnosticMessage;
-        A_destructuring_declaration_must_have_an_initializer: DiagnosticMessage;
-        An_implementation_cannot_be_declared_in_ambient_contexts: DiagnosticMessage;
-        Modifiers_cannot_appear_here: DiagnosticMessage;
-        Merge_conflict_marker_encountered: DiagnosticMessage;
-        A_rest_element_cannot_have_an_initializer: DiagnosticMessage;
-        A_parameter_property_may_not_be_declared_using_a_binding_pattern: DiagnosticMessage;
-        Only_a_single_variable_declaration_is_allowed_in_a_for_of_statement: DiagnosticMessage;
-        The_variable_declaration_of_a_for_in_statement_cannot_have_an_initializer: DiagnosticMessage;
-        The_variable_declaration_of_a_for_of_statement_cannot_have_an_initializer: DiagnosticMessage;
-        An_import_declaration_cannot_have_modifiers: DiagnosticMessage;
-        Module_0_has_no_default_export: DiagnosticMessage;
-        An_export_declaration_cannot_have_modifiers: DiagnosticMessage;
-        Export_declarations_are_not_permitted_in_a_namespace: DiagnosticMessage;
-        Catch_clause_variable_cannot_have_a_type_annotation: DiagnosticMessage;
-        Catch_clause_variable_cannot_have_an_initializer: DiagnosticMessage;
-        An_extended_Unicode_escape_value_must_be_between_0x0_and_0x10FFFF_inclusive: DiagnosticMessage;
-        Unterminated_Unicode_escape_sequence: DiagnosticMessage;
-        Line_terminator_not_permitted_before_arrow: DiagnosticMessage;
-        Import_assignment_cannot_be_used_when_targeting_ECMAScript_modules_Consider_using_import_Asterisk_as_ns_from_mod_import_a_from_mod_import_d_from_mod_or_another_module_format_instead: DiagnosticMessage;
-        Export_assignment_cannot_be_used_when_targeting_ECMAScript_modules_Consider_using_export_default_or_another_module_format_instead: DiagnosticMessage;
-        Cannot_re_export_a_type_when_the_isolatedModules_flag_is_provided: DiagnosticMessage;
-        Decorators_are_not_valid_here: DiagnosticMessage;
-        Decorators_cannot_be_applied_to_multiple_get_Slashset_accessors_of_the_same_name: DiagnosticMessage;
-        Cannot_compile_namespaces_when_the_isolatedModules_flag_is_provided: DiagnosticMessage;
-        Ambient_const_enums_are_not_allowed_when_the_isolatedModules_flag_is_provided: DiagnosticMessage;
-        Invalid_use_of_0_Class_definitions_are_automatically_in_strict_mode: DiagnosticMessage;
-        A_class_declaration_without_the_default_modifier_must_have_a_name: DiagnosticMessage;
-        Identifier_expected_0_is_a_reserved_word_in_strict_mode: DiagnosticMessage;
-        Identifier_expected_0_is_a_reserved_word_in_strict_mode_Class_definitions_are_automatically_in_strict_mode: DiagnosticMessage;
-        Identifier_expected_0_is_a_reserved_word_in_strict_mode_Modules_are_automatically_in_strict_mode: DiagnosticMessage;
-        Invalid_use_of_0_Modules_are_automatically_in_strict_mode: DiagnosticMessage;
-        Identifier_expected_esModule_is_reserved_as_an_exported_marker_when_transforming_ECMAScript_modules: DiagnosticMessage;
-        Export_assignment_is_not_supported_when_module_flag_is_system: DiagnosticMessage;
-        Experimental_support_for_decorators_is_a_feature_that_is_subject_to_change_in_a_future_release_Set_the_experimentalDecorators_option_to_remove_this_warning: DiagnosticMessage;
-        Generators_are_only_available_when_targeting_ECMAScript_2015_or_higher: DiagnosticMessage;
-        Generators_are_not_allowed_in_an_ambient_context: DiagnosticMessage;
-        An_overload_signature_cannot_be_declared_as_a_generator: DiagnosticMessage;
-        _0_tag_already_specified: DiagnosticMessage;
-        Signature_0_must_be_a_type_predicate: DiagnosticMessage;
-        Cannot_find_parameter_0: DiagnosticMessage;
-        Type_predicate_0_is_not_assignable_to_1: DiagnosticMessage;
-        Parameter_0_is_not_in_the_same_position_as_parameter_1: DiagnosticMessage;
-        A_type_predicate_is_only_allowed_in_return_type_position_for_functions_and_methods: DiagnosticMessage;
-        A_type_predicate_cannot_reference_a_rest_parameter: DiagnosticMessage;
-        A_type_predicate_cannot_reference_element_0_in_a_binding_pattern: DiagnosticMessage;
-        An_export_assignment_can_only_be_used_in_a_module: DiagnosticMessage;
-        An_import_declaration_can_only_be_used_in_a_namespace_or_module: DiagnosticMessage;
-        An_export_declaration_can_only_be_used_in_a_module: DiagnosticMessage;
-        An_ambient_module_declaration_is_only_allowed_at_the_top_level_in_a_file: DiagnosticMessage;
-        A_namespace_declaration_is_only_allowed_in_a_namespace_or_module: DiagnosticMessage;
-        The_return_type_of_a_property_decorator_function_must_be_either_void_or_any: DiagnosticMessage;
-        The_return_type_of_a_parameter_decorator_function_must_be_either_void_or_any: DiagnosticMessage;
-        Unable_to_resolve_signature_of_class_decorator_when_called_as_an_expression: DiagnosticMessage;
-        Unable_to_resolve_signature_of_parameter_decorator_when_called_as_an_expression: DiagnosticMessage;
-        Unable_to_resolve_signature_of_property_decorator_when_called_as_an_expression: DiagnosticMessage;
-        Unable_to_resolve_signature_of_method_decorator_when_called_as_an_expression: DiagnosticMessage;
-        abstract_modifier_can_only_appear_on_a_class_method_or_property_declaration: DiagnosticMessage;
-        _0_modifier_cannot_be_used_with_1_modifier: DiagnosticMessage;
-        Abstract_methods_can_only_appear_within_an_abstract_class: DiagnosticMessage;
-        Method_0_cannot_have_an_implementation_because_it_is_marked_abstract: DiagnosticMessage;
-        An_interface_property_cannot_have_an_initializer: DiagnosticMessage;
-        A_type_literal_property_cannot_have_an_initializer: DiagnosticMessage;
-        A_class_member_cannot_have_the_0_keyword: DiagnosticMessage;
-        A_decorator_can_only_decorate_a_method_implementation_not_an_overload: DiagnosticMessage;
-        Function_declarations_are_not_allowed_inside_blocks_in_strict_mode_when_targeting_ES3_or_ES5: DiagnosticMessage;
-        Function_declarations_are_not_allowed_inside_blocks_in_strict_mode_when_targeting_ES3_or_ES5_Class_definitions_are_automatically_in_strict_mode: DiagnosticMessage;
-        Function_declarations_are_not_allowed_inside_blocks_in_strict_mode_when_targeting_ES3_or_ES5_Modules_are_automatically_in_strict_mode: DiagnosticMessage;
-        _0_tag_cannot_be_used_independently_as_a_top_level_JSDoc_tag: DiagnosticMessage;
-        A_const_initializer_in_an_ambient_context_must_be_a_string_or_numeric_literal: DiagnosticMessage;
-        A_definite_assignment_assertion_is_not_permitted_in_this_context: DiagnosticMessage;
-        with_statements_are_not_allowed_in_an_async_function_block: DiagnosticMessage;
-        await_expression_is_only_allowed_within_an_async_function: DiagnosticMessage;
-        can_only_be_used_in_an_object_literal_property_inside_a_destructuring_assignment: DiagnosticMessage;
-        The_body_of_an_if_statement_cannot_be_the_empty_statement: DiagnosticMessage;
-        Global_module_exports_may_only_appear_in_module_files: DiagnosticMessage;
-        Global_module_exports_may_only_appear_in_declaration_files: DiagnosticMessage;
-        Global_module_exports_may_only_appear_at_top_level: DiagnosticMessage;
-        A_parameter_property_cannot_be_declared_using_a_rest_parameter: DiagnosticMessage;
-        An_abstract_accessor_cannot_have_an_implementation: DiagnosticMessage;
-        A_default_export_can_only_be_used_in_an_ECMAScript_style_module: DiagnosticMessage;
-        Type_of_await_operand_must_either_be_a_valid_promise_or_must_not_contain_a_callable_then_member: DiagnosticMessage;
-        Type_of_yield_operand_in_an_async_generator_must_either_be_a_valid_promise_or_must_not_contain_a_callable_then_member: DiagnosticMessage;
-        Type_of_iterated_elements_of_a_yield_Asterisk_operand_must_either_be_a_valid_promise_or_must_not_contain_a_callable_then_member: DiagnosticMessage;
-        Dynamic_import_is_only_supported_when_module_flag_is_commonjs_or_esNext: DiagnosticMessage;
-        Dynamic_import_must_have_one_specifier_as_an_argument: DiagnosticMessage;
-        Specifier_of_dynamic_import_cannot_be_spread_element: DiagnosticMessage;
-        Dynamic_import_cannot_have_type_arguments: DiagnosticMessage;
-        String_literal_with_double_quotes_expected: DiagnosticMessage;
-        Property_value_can_only_be_string_literal_numeric_literal_true_false_null_object_literal_or_array_literal: DiagnosticMessage;
-        _0_accepts_too_few_arguments_to_be_used_as_a_decorator_here_Did_you_mean_to_call_it_first_and_write_0: DiagnosticMessage;
-        A_property_of_an_interface_or_type_literal_whose_type_is_a_unique_symbol_type_must_be_readonly: DiagnosticMessage;
-        A_property_of_a_class_whose_type_is_a_unique_symbol_type_must_be_both_static_and_readonly: DiagnosticMessage;
-        A_variable_whose_type_is_a_unique_symbol_type_must_be_const: DiagnosticMessage;
-        unique_symbol_types_may_not_be_used_on_a_variable_declaration_with_a_binding_name: DiagnosticMessage;
-        unique_symbol_types_are_only_allowed_on_variables_in_a_variable_statement: DiagnosticMessage;
-        unique_symbol_types_are_not_allowed_here: DiagnosticMessage;
-        An_index_signature_parameter_type_cannot_be_a_type_alias_Consider_writing_0_Colon_1_Colon_2_instead: DiagnosticMessage;
-        An_index_signature_parameter_type_cannot_be_a_union_type_Consider_using_a_mapped_object_type_instead: DiagnosticMessage;
-        infer_declarations_are_only_permitted_in_the_extends_clause_of_a_conditional_type: DiagnosticMessage;
-        Module_0_does_not_refer_to_a_value_but_is_used_as_a_value_here: DiagnosticMessage;
-        Module_0_does_not_refer_to_a_type_but_is_used_as_a_type_here: DiagnosticMessage;
-        Type_arguments_cannot_be_used_here: DiagnosticMessage;
-        The_import_meta_meta_property_is_only_allowed_using_ESNext_for_the_target_and_module_compiler_options: DiagnosticMessage;
-        Duplicate_identifier_0: DiagnosticMessage;
-        Initializer_of_instance_member_variable_0_cannot_reference_identifier_1_declared_in_the_constructor: DiagnosticMessage;
-        Static_members_cannot_reference_class_type_parameters: DiagnosticMessage;
-        Circular_definition_of_import_alias_0: DiagnosticMessage;
-        Cannot_find_name_0: DiagnosticMessage;
-        Module_0_has_no_exported_member_1: DiagnosticMessage;
-        File_0_is_not_a_module: DiagnosticMessage;
-        Cannot_find_module_0: DiagnosticMessage;
-        Module_0_has_already_exported_a_member_named_1_Consider_explicitly_re_exporting_to_resolve_the_ambiguity: DiagnosticMessage;
-        An_export_assignment_cannot_be_used_in_a_module_with_other_exported_elements: DiagnosticMessage;
-        Type_0_recursively_references_itself_as_a_base_type: DiagnosticMessage;
-        A_class_may_only_extend_another_class: DiagnosticMessage;
-        An_interface_may_only_extend_a_class_or_another_interface: DiagnosticMessage;
-        Type_parameter_0_has_a_circular_constraint: DiagnosticMessage;
-        Generic_type_0_requires_1_type_argument_s: DiagnosticMessage;
-        Type_0_is_not_generic: DiagnosticMessage;
-        Global_type_0_must_be_a_class_or_interface_type: DiagnosticMessage;
-        Global_type_0_must_have_1_type_parameter_s: DiagnosticMessage;
-        Cannot_find_global_type_0: DiagnosticMessage;
-        Named_property_0_of_types_1_and_2_are_not_identical: DiagnosticMessage;
-        Interface_0_cannot_simultaneously_extend_types_1_and_2: DiagnosticMessage;
-        Excessive_stack_depth_comparing_types_0_and_1: DiagnosticMessage;
-        Type_0_is_not_assignable_to_type_1: DiagnosticMessage;
-        Cannot_redeclare_exported_variable_0: DiagnosticMessage;
-        Property_0_is_missing_in_type_1: DiagnosticMessage;
-        Property_0_is_private_in_type_1_but_not_in_type_2: DiagnosticMessage;
-        Types_of_property_0_are_incompatible: DiagnosticMessage;
-        Property_0_is_optional_in_type_1_but_required_in_type_2: DiagnosticMessage;
-        Types_of_parameters_0_and_1_are_incompatible: DiagnosticMessage;
-        Index_signature_is_missing_in_type_0: DiagnosticMessage;
-        Index_signatures_are_incompatible: DiagnosticMessage;
-        this_cannot_be_referenced_in_a_module_or_namespace_body: DiagnosticMessage;
-        this_cannot_be_referenced_in_current_location: DiagnosticMessage;
-        this_cannot_be_referenced_in_constructor_arguments: DiagnosticMessage;
-        this_cannot_be_referenced_in_a_static_property_initializer: DiagnosticMessage;
-        super_can_only_be_referenced_in_a_derived_class: DiagnosticMessage;
-        super_cannot_be_referenced_in_constructor_arguments: DiagnosticMessage;
-        Super_calls_are_not_permitted_outside_constructors_or_in_nested_functions_inside_constructors: DiagnosticMessage;
-        super_property_access_is_permitted_only_in_a_constructor_member_function_or_member_accessor_of_a_derived_class: DiagnosticMessage;
-        Property_0_does_not_exist_on_type_1: DiagnosticMessage;
-        Only_public_and_protected_methods_of_the_base_class_are_accessible_via_the_super_keyword: DiagnosticMessage;
-        Property_0_is_private_and_only_accessible_within_class_1: DiagnosticMessage;
-        An_index_expression_argument_must_be_of_type_string_number_symbol_or_any: DiagnosticMessage;
-        This_syntax_requires_an_imported_helper_named_1_but_module_0_has_no_exported_member_1: DiagnosticMessage;
-        Type_0_does_not_satisfy_the_constraint_1: DiagnosticMessage;
-        Argument_of_type_0_is_not_assignable_to_parameter_of_type_1: DiagnosticMessage;
-        Call_target_does_not_contain_any_signatures: DiagnosticMessage;
-        Untyped_function_calls_may_not_accept_type_arguments: DiagnosticMessage;
-        Value_of_type_0_is_not_callable_Did_you_mean_to_include_new: DiagnosticMessage;
-        Cannot_invoke_an_expression_whose_type_lacks_a_call_signature_Type_0_has_no_compatible_call_signatures: DiagnosticMessage;
-        Only_a_void_function_can_be_called_with_the_new_keyword: DiagnosticMessage;
-        Cannot_use_new_with_an_expression_whose_type_lacks_a_call_or_construct_signature: DiagnosticMessage;
-        Type_0_cannot_be_converted_to_type_1: DiagnosticMessage;
-        Object_literal_may_only_specify_known_properties_and_0_does_not_exist_in_type_1: DiagnosticMessage;
-        This_syntax_requires_an_imported_helper_but_module_0_cannot_be_found: DiagnosticMessage;
-        A_function_whose_declared_type_is_neither_void_nor_any_must_return_a_value: DiagnosticMessage;
-        An_arithmetic_operand_must_be_of_type_any_number_or_an_enum_type: DiagnosticMessage;
-        The_operand_of_an_increment_or_decrement_operator_must_be_a_variable_or_a_property_access: DiagnosticMessage;
-        The_left_hand_side_of_an_instanceof_expression_must_be_of_type_any_an_object_type_or_a_type_parameter: DiagnosticMessage;
-        The_right_hand_side_of_an_instanceof_expression_must_be_of_type_any_or_of_a_type_assignable_to_the_Function_interface_type: DiagnosticMessage;
-        The_left_hand_side_of_an_in_expression_must_be_of_type_any_string_number_or_symbol: DiagnosticMessage;
-        The_right_hand_side_of_an_in_expression_must_be_of_type_any_an_object_type_or_a_type_parameter: DiagnosticMessage;
-        The_left_hand_side_of_an_arithmetic_operation_must_be_of_type_any_number_or_an_enum_type: DiagnosticMessage;
-        The_right_hand_side_of_an_arithmetic_operation_must_be_of_type_any_number_or_an_enum_type: DiagnosticMessage;
-        The_left_hand_side_of_an_assignment_expression_must_be_a_variable_or_a_property_access: DiagnosticMessage;
-        Operator_0_cannot_be_applied_to_types_1_and_2: DiagnosticMessage;
-        Function_lacks_ending_return_statement_and_return_type_does_not_include_undefined: DiagnosticMessage;
-        Type_parameter_name_cannot_be_0: DiagnosticMessage;
-        A_parameter_property_is_only_allowed_in_a_constructor_implementation: DiagnosticMessage;
-        A_rest_parameter_must_be_of_an_array_type: DiagnosticMessage;
-        A_parameter_initializer_is_only_allowed_in_a_function_or_constructor_implementation: DiagnosticMessage;
-        Parameter_0_cannot_be_referenced_in_its_initializer: DiagnosticMessage;
-        Initializer_of_parameter_0_cannot_reference_identifier_1_declared_after_it: DiagnosticMessage;
-        Duplicate_string_index_signature: DiagnosticMessage;
-        Duplicate_number_index_signature: DiagnosticMessage;
-        A_super_call_must_be_the_first_statement_in_the_constructor_when_a_class_contains_initialized_properties_or_has_parameter_properties: DiagnosticMessage;
-        Constructors_for_derived_classes_must_contain_a_super_call: DiagnosticMessage;
-        A_get_accessor_must_return_a_value: DiagnosticMessage;
-        Getter_and_setter_accessors_do_not_agree_in_visibility: DiagnosticMessage;
-        get_and_set_accessor_must_have_the_same_type: DiagnosticMessage;
-        A_signature_with_an_implementation_cannot_use_a_string_literal_type: DiagnosticMessage;
-        Specialized_overload_signature_is_not_assignable_to_any_non_specialized_signature: DiagnosticMessage;
-        Overload_signatures_must_all_be_exported_or_non_exported: DiagnosticMessage;
-        Overload_signatures_must_all_be_ambient_or_non_ambient: DiagnosticMessage;
-        Overload_signatures_must_all_be_public_private_or_protected: DiagnosticMessage;
-        Overload_signatures_must_all_be_optional_or_required: DiagnosticMessage;
-        Function_overload_must_be_static: DiagnosticMessage;
-        Function_overload_must_not_be_static: DiagnosticMessage;
-        Function_implementation_name_must_be_0: DiagnosticMessage;
-        Constructor_implementation_is_missing: DiagnosticMessage;
-        Function_implementation_is_missing_or_not_immediately_following_the_declaration: DiagnosticMessage;
-        Multiple_constructor_implementations_are_not_allowed: DiagnosticMessage;
-        Duplicate_function_implementation: DiagnosticMessage;
-        Overload_signature_is_not_compatible_with_function_implementation: DiagnosticMessage;
-        Individual_declarations_in_merged_declaration_0_must_be_all_exported_or_all_local: DiagnosticMessage;
-        Duplicate_identifier_arguments_Compiler_uses_arguments_to_initialize_rest_parameters: DiagnosticMessage;
-        Declaration_name_conflicts_with_built_in_global_identifier_0: DiagnosticMessage;
-        Duplicate_identifier_this_Compiler_uses_variable_declaration_this_to_capture_this_reference: DiagnosticMessage;
-        Expression_resolves_to_variable_declaration_this_that_compiler_uses_to_capture_this_reference: DiagnosticMessage;
-        Duplicate_identifier_super_Compiler_uses_super_to_capture_base_class_reference: DiagnosticMessage;
-        Expression_resolves_to_super_that_compiler_uses_to_capture_base_class_reference: DiagnosticMessage;
-        Subsequent_variable_declarations_must_have_the_same_type_Variable_0_must_be_of_type_1_but_here_has_type_2: DiagnosticMessage;
-        The_left_hand_side_of_a_for_in_statement_cannot_use_a_type_annotation: DiagnosticMessage;
-        The_left_hand_side_of_a_for_in_statement_must_be_of_type_string_or_any: DiagnosticMessage;
-        The_left_hand_side_of_a_for_in_statement_must_be_a_variable_or_a_property_access: DiagnosticMessage;
-        The_right_hand_side_of_a_for_in_statement_must_be_of_type_any_an_object_type_or_a_type_parameter_but_here_has_type_0: DiagnosticMessage;
-        Setters_cannot_return_a_value: DiagnosticMessage;
-        Return_type_of_constructor_signature_must_be_assignable_to_the_instance_type_of_the_class: DiagnosticMessage;
-        The_with_statement_is_not_supported_All_symbols_in_a_with_block_will_have_type_any: DiagnosticMessage;
-        Property_0_of_type_1_is_not_assignable_to_string_index_type_2: DiagnosticMessage;
-        Property_0_of_type_1_is_not_assignable_to_numeric_index_type_2: DiagnosticMessage;
-        Numeric_index_type_0_is_not_assignable_to_string_index_type_1: DiagnosticMessage;
-        Class_name_cannot_be_0: DiagnosticMessage;
-        Class_0_incorrectly_extends_base_class_1: DiagnosticMessage;
-        Property_0_in_type_1_is_not_assignable_to_the_same_property_in_base_type_2: DiagnosticMessage;
-        Class_static_side_0_incorrectly_extends_base_class_static_side_1: DiagnosticMessage;
-        Class_0_incorrectly_implements_interface_1: DiagnosticMessage;
-        A_class_may_only_implement_another_class_or_interface: DiagnosticMessage;
-        Class_0_defines_instance_member_function_1_but_extended_class_2_defines_it_as_instance_member_accessor: DiagnosticMessage;
-        Class_0_defines_instance_member_function_1_but_extended_class_2_defines_it_as_instance_member_property: DiagnosticMessage;
-        Class_0_defines_instance_member_property_1_but_extended_class_2_defines_it_as_instance_member_function: DiagnosticMessage;
-        Class_0_defines_instance_member_accessor_1_but_extended_class_2_defines_it_as_instance_member_function: DiagnosticMessage;
-        Interface_name_cannot_be_0: DiagnosticMessage;
-        All_declarations_of_0_must_have_identical_type_parameters: DiagnosticMessage;
-        Interface_0_incorrectly_extends_interface_1: DiagnosticMessage;
-        Enum_name_cannot_be_0: DiagnosticMessage;
-        In_an_enum_with_multiple_declarations_only_one_declaration_can_omit_an_initializer_for_its_first_enum_element: DiagnosticMessage;
-        A_namespace_declaration_cannot_be_in_a_different_file_from_a_class_or_function_with_which_it_is_merged: DiagnosticMessage;
-        A_namespace_declaration_cannot_be_located_prior_to_a_class_or_function_with_which_it_is_merged: DiagnosticMessage;
-        Ambient_modules_cannot_be_nested_in_other_modules_or_namespaces: DiagnosticMessage;
-        Ambient_module_declaration_cannot_specify_relative_module_name: DiagnosticMessage;
-        Module_0_is_hidden_by_a_local_declaration_with_the_same_name: DiagnosticMessage;
-        Import_name_cannot_be_0: DiagnosticMessage;
-        Import_or_export_declaration_in_an_ambient_module_declaration_cannot_reference_module_through_relative_module_name: DiagnosticMessage;
-        Import_declaration_conflicts_with_local_declaration_of_0: DiagnosticMessage;
-        Duplicate_identifier_0_Compiler_reserves_name_1_in_top_level_scope_of_a_module: DiagnosticMessage;
-        Types_have_separate_declarations_of_a_private_property_0: DiagnosticMessage;
-        Property_0_is_protected_but_type_1_is_not_a_class_derived_from_2: DiagnosticMessage;
-        Property_0_is_protected_in_type_1_but_public_in_type_2: DiagnosticMessage;
-        Property_0_is_protected_and_only_accessible_within_class_1_and_its_subclasses: DiagnosticMessage;
-        Property_0_is_protected_and_only_accessible_through_an_instance_of_class_1: DiagnosticMessage;
-        The_0_operator_is_not_allowed_for_boolean_types_Consider_using_1_instead: DiagnosticMessage;
-        Block_scoped_variable_0_used_before_its_declaration: DiagnosticMessage;
-        Class_0_used_before_its_declaration: DiagnosticMessage;
-        Enum_0_used_before_its_declaration: DiagnosticMessage;
-        Cannot_redeclare_block_scoped_variable_0: DiagnosticMessage;
-        An_enum_member_cannot_have_a_numeric_name: DiagnosticMessage;
-        The_type_argument_for_type_parameter_0_cannot_be_inferred_from_the_usage_Consider_specifying_the_type_arguments_explicitly: DiagnosticMessage;
-        Variable_0_is_used_before_being_assigned: DiagnosticMessage;
-        Type_argument_candidate_1_is_not_a_valid_type_argument_because_it_is_not_a_supertype_of_candidate_0: DiagnosticMessage;
-        Type_alias_0_circularly_references_itself: DiagnosticMessage;
-        Type_alias_name_cannot_be_0: DiagnosticMessage;
-        An_AMD_module_cannot_have_multiple_name_assignments: DiagnosticMessage;
-        Type_0_has_no_property_1_and_no_string_index_signature: DiagnosticMessage;
-        Type_0_has_no_property_1: DiagnosticMessage;
-        Type_0_is_not_an_array_type: DiagnosticMessage;
-        A_rest_element_must_be_last_in_a_destructuring_pattern: DiagnosticMessage;
-        A_binding_pattern_parameter_cannot_be_optional_in_an_implementation_signature: DiagnosticMessage;
-        A_computed_property_name_must_be_of_type_string_number_symbol_or_any: DiagnosticMessage;
-        this_cannot_be_referenced_in_a_computed_property_name: DiagnosticMessage;
-        super_cannot_be_referenced_in_a_computed_property_name: DiagnosticMessage;
-        A_computed_property_name_cannot_reference_a_type_parameter_from_its_containing_type: DiagnosticMessage;
-        Cannot_find_global_value_0: DiagnosticMessage;
-        The_0_operator_cannot_be_applied_to_type_symbol: DiagnosticMessage;
-        Symbol_reference_does_not_refer_to_the_global_Symbol_constructor_object: DiagnosticMessage;
-        A_computed_property_name_of_the_form_0_must_be_of_type_symbol: DiagnosticMessage;
-        Spread_operator_in_new_expressions_is_only_available_when_targeting_ECMAScript_5_and_higher: DiagnosticMessage;
-        Enum_declarations_must_all_be_const_or_non_const: DiagnosticMessage;
-        In_const_enum_declarations_member_initializer_must_be_constant_expression: DiagnosticMessage;
-        const_enums_can_only_be_used_in_property_or_index_access_expressions_or_the_right_hand_side_of_an_import_declaration_or_export_assignment_or_type_query: DiagnosticMessage;
-        A_const_enum_member_can_only_be_accessed_using_a_string_literal: DiagnosticMessage;
-        const_enum_member_initializer_was_evaluated_to_a_non_finite_value: DiagnosticMessage;
-        const_enum_member_initializer_was_evaluated_to_disallowed_value_NaN: DiagnosticMessage;
-        Property_0_does_not_exist_on_const_enum_1: DiagnosticMessage;
-        let_is_not_allowed_to_be_used_as_a_name_in_let_or_const_declarations: DiagnosticMessage;
-        Cannot_initialize_outer_scoped_variable_0_in_the_same_scope_as_block_scoped_declaration_1: DiagnosticMessage;
-        The_left_hand_side_of_a_for_of_statement_cannot_use_a_type_annotation: DiagnosticMessage;
-        Export_declaration_conflicts_with_exported_declaration_of_0: DiagnosticMessage;
-        The_left_hand_side_of_a_for_of_statement_must_be_a_variable_or_a_property_access: DiagnosticMessage;
-        Type_0_must_have_a_Symbol_iterator_method_that_returns_an_iterator: DiagnosticMessage;
-        An_iterator_must_have_a_next_method: DiagnosticMessage;
-        The_type_returned_by_the_next_method_of_an_iterator_must_have_a_value_property: DiagnosticMessage;
-        The_left_hand_side_of_a_for_in_statement_cannot_be_a_destructuring_pattern: DiagnosticMessage;
-        Cannot_redeclare_identifier_0_in_catch_clause: DiagnosticMessage;
-        Tuple_type_0_with_length_1_cannot_be_assigned_to_tuple_with_length_2: DiagnosticMessage;
-        Using_a_string_in_a_for_of_statement_is_only_supported_in_ECMAScript_5_and_higher: DiagnosticMessage;
-        Type_0_is_not_an_array_type_or_a_string_type: DiagnosticMessage;
-        The_arguments_object_cannot_be_referenced_in_an_arrow_function_in_ES3_and_ES5_Consider_using_a_standard_function_expression: DiagnosticMessage;
-        Module_0_resolves_to_a_non_module_entity_and_cannot_be_imported_using_this_construct: DiagnosticMessage;
-        Module_0_uses_export_and_cannot_be_used_with_export_Asterisk: DiagnosticMessage;
-        An_interface_can_only_extend_an_identifier_Slashqualified_name_with_optional_type_arguments: DiagnosticMessage;
-        A_class_can_only_implement_an_identifier_Slashqualified_name_with_optional_type_arguments: DiagnosticMessage;
-        A_rest_element_cannot_contain_a_binding_pattern: DiagnosticMessage;
-        _0_is_referenced_directly_or_indirectly_in_its_own_type_annotation: DiagnosticMessage;
-        Cannot_find_namespace_0: DiagnosticMessage;
-        Type_0_must_have_a_Symbol_asyncIterator_method_that_returns_an_async_iterator: DiagnosticMessage;
-        A_generator_cannot_have_a_void_type_annotation: DiagnosticMessage;
-        _0_is_referenced_directly_or_indirectly_in_its_own_base_expression: DiagnosticMessage;
-        Type_0_is_not_a_constructor_function_type: DiagnosticMessage;
-        No_base_constructor_has_the_specified_number_of_type_arguments: DiagnosticMessage;
-        Base_constructor_return_type_0_is_not_a_class_or_interface_type: DiagnosticMessage;
-        Base_constructors_must_all_have_the_same_return_type: DiagnosticMessage;
-        Cannot_create_an_instance_of_an_abstract_class: DiagnosticMessage;
-        Overload_signatures_must_all_be_abstract_or_non_abstract: DiagnosticMessage;
-        Abstract_method_0_in_class_1_cannot_be_accessed_via_super_expression: DiagnosticMessage;
-        Classes_containing_abstract_methods_must_be_marked_abstract: DiagnosticMessage;
-        Non_abstract_class_0_does_not_implement_inherited_abstract_member_1_from_class_2: DiagnosticMessage;
-        All_declarations_of_an_abstract_method_must_be_consecutive: DiagnosticMessage;
-        Cannot_assign_an_abstract_constructor_type_to_a_non_abstract_constructor_type: DiagnosticMessage;
-        A_this_based_type_guard_is_not_compatible_with_a_parameter_based_type_guard: DiagnosticMessage;
-        An_async_iterator_must_have_a_next_method: DiagnosticMessage;
-        Duplicate_identifier_0_Compiler_uses_declaration_1_to_support_async_functions: DiagnosticMessage;
-        Expression_resolves_to_variable_declaration_0_that_compiler_uses_to_support_async_functions: DiagnosticMessage;
-        The_arguments_object_cannot_be_referenced_in_an_async_function_or_method_in_ES3_and_ES5_Consider_using_a_standard_function_or_method: DiagnosticMessage;
-        yield_expressions_cannot_be_used_in_a_parameter_initializer: DiagnosticMessage;
-        await_expressions_cannot_be_used_in_a_parameter_initializer: DiagnosticMessage;
-        Initializer_provides_no_value_for_this_binding_element_and_the_binding_element_has_no_default_value: DiagnosticMessage;
-        A_this_type_is_available_only_in_a_non_static_member_of_a_class_or_interface: DiagnosticMessage;
-        The_inferred_type_of_0_references_an_inaccessible_1_type_A_type_annotation_is_necessary: DiagnosticMessage;
-        A_module_cannot_have_multiple_default_exports: DiagnosticMessage;
-        Duplicate_identifier_0_Compiler_reserves_name_1_in_top_level_scope_of_a_module_containing_async_functions: DiagnosticMessage;
-        Property_0_is_incompatible_with_index_signature: DiagnosticMessage;
-        Object_is_possibly_null: DiagnosticMessage;
-        Object_is_possibly_undefined: DiagnosticMessage;
-        Object_is_possibly_null_or_undefined: DiagnosticMessage;
-        A_function_returning_never_cannot_have_a_reachable_end_point: DiagnosticMessage;
-        Enum_type_0_has_members_with_initializers_that_are_not_literals: DiagnosticMessage;
-        Type_0_cannot_be_used_to_index_type_1: DiagnosticMessage;
-        Type_0_has_no_matching_index_signature_for_type_1: DiagnosticMessage;
-        Type_0_cannot_be_used_as_an_index_type: DiagnosticMessage;
-        Cannot_assign_to_0_because_it_is_not_a_variable: DiagnosticMessage;
-        Cannot_assign_to_0_because_it_is_a_constant_or_a_read_only_property: DiagnosticMessage;
-        The_target_of_an_assignment_must_be_a_variable_or_a_property_access: DiagnosticMessage;
-        Index_signature_in_type_0_only_permits_reading: DiagnosticMessage;
-        Duplicate_identifier_newTarget_Compiler_uses_variable_declaration_newTarget_to_capture_new_target_meta_property_reference: DiagnosticMessage;
-        Expression_resolves_to_variable_declaration_newTarget_that_compiler_uses_to_capture_new_target_meta_property_reference: DiagnosticMessage;
-        A_mixin_class_must_have_a_constructor_with_a_single_rest_parameter_of_type_any: DiagnosticMessage;
-        Property_0_has_conflicting_declarations_and_is_inaccessible_in_type_1: DiagnosticMessage;
-        The_type_returned_by_the_next_method_of_an_async_iterator_must_be_a_promise_for_a_type_with_a_value_property: DiagnosticMessage;
-        Type_0_is_not_an_array_type_or_does_not_have_a_Symbol_iterator_method_that_returns_an_iterator: DiagnosticMessage;
-        Type_0_is_not_an_array_type_or_a_string_type_or_does_not_have_a_Symbol_iterator_method_that_returns_an_iterator: DiagnosticMessage;
-        Generic_type_instantiation_is_excessively_deep_and_possibly_infinite: DiagnosticMessage;
-        Property_0_does_not_exist_on_type_1_Did_you_mean_2: DiagnosticMessage;
-        Cannot_find_name_0_Did_you_mean_1: DiagnosticMessage;
-        Computed_values_are_not_permitted_in_an_enum_with_string_valued_members: DiagnosticMessage;
-        Expected_0_arguments_but_got_1: DiagnosticMessage;
-        Expected_at_least_0_arguments_but_got_1: DiagnosticMessage;
-        Expected_0_arguments_but_got_1_or_more: DiagnosticMessage;
-        Expected_at_least_0_arguments_but_got_1_or_more: DiagnosticMessage;
-        Expected_0_type_arguments_but_got_1: DiagnosticMessage;
-        Type_0_has_no_properties_in_common_with_type_1: DiagnosticMessage;
-        Value_of_type_0_has_no_properties_in_common_with_type_1_Did_you_mean_to_call_it: DiagnosticMessage;
-        Object_literal_may_only_specify_known_properties_but_0_does_not_exist_in_type_1_Did_you_mean_to_write_2: DiagnosticMessage;
-        Base_class_expressions_cannot_reference_class_type_parameters: DiagnosticMessage;
-        The_containing_function_or_module_body_is_too_large_for_control_flow_analysis: DiagnosticMessage;
-        Property_0_has_no_initializer_and_is_not_definitely_assigned_in_the_constructor: DiagnosticMessage;
-        Property_0_is_used_before_being_assigned: DiagnosticMessage;
-        A_rest_element_cannot_have_a_property_name: DiagnosticMessage;
-        Enum_declarations_can_only_merge_with_namespace_or_other_enum_declarations: DiagnosticMessage;
-        Type_0_is_not_an_array_type_Use_compiler_option_downlevelIteration_to_allow_iterating_of_iterators: DiagnosticMessage;
-        Type_0_is_not_an_array_type_or_a_string_type_Use_compiler_option_downlevelIteration_to_allow_iterating_of_iterators: DiagnosticMessage;
-        Property_0_does_not_exist_on_type_1_Did_you_forget_to_use_await: DiagnosticMessage;
-        Object_is_of_type_unknown: DiagnosticMessage;
-        JSX_element_attributes_type_0_may_not_be_a_union_type: DiagnosticMessage;
-        The_return_type_of_a_JSX_element_constructor_must_return_an_object_type: DiagnosticMessage;
-        JSX_element_implicitly_has_type_any_because_the_global_type_JSX_Element_does_not_exist: DiagnosticMessage;
-        Property_0_in_type_1_is_not_assignable_to_type_2: DiagnosticMessage;
-        JSX_element_type_0_does_not_have_any_construct_or_call_signatures: DiagnosticMessage;
-        JSX_element_type_0_is_not_a_constructor_function_for_JSX_elements: DiagnosticMessage;
-        Property_0_of_JSX_spread_attribute_is_not_assignable_to_target_property: DiagnosticMessage;
-        JSX_element_class_does_not_support_attributes_because_it_does_not_have_a_0_property: DiagnosticMessage;
-        The_global_type_JSX_0_may_not_have_more_than_one_property: DiagnosticMessage;
-        JSX_spread_child_must_be_an_array_type: DiagnosticMessage;
-        Cannot_augment_module_0_with_value_exports_because_it_resolves_to_a_non_module_entity: DiagnosticMessage;
-        A_member_initializer_in_a_enum_declaration_cannot_reference_members_declared_after_it_including_members_defined_in_other_enums: DiagnosticMessage;
-        Merged_declaration_0_cannot_include_a_default_export_declaration_Consider_adding_a_separate_export_default_0_declaration_instead: DiagnosticMessage;
-        Non_abstract_class_expression_does_not_implement_inherited_abstract_member_0_from_class_1: DiagnosticMessage;
-        Exported_external_package_typings_file_cannot_contain_tripleslash_references_Please_contact_the_package_author_to_update_the_package_definition: DiagnosticMessage;
-        Exported_external_package_typings_file_0_is_not_a_module_Please_contact_the_package_author_to_update_the_package_definition: DiagnosticMessage;
-        JSX_expressions_must_have_one_parent_element: DiagnosticMessage;
-        Type_0_provides_no_match_for_the_signature_1: DiagnosticMessage;
-        super_is_only_allowed_in_members_of_object_literal_expressions_when_option_target_is_ES2015_or_higher: DiagnosticMessage;
-        super_can_only_be_referenced_in_members_of_derived_classes_or_object_literal_expressions: DiagnosticMessage;
-        Cannot_export_0_Only_local_declarations_can_be_exported_from_a_module: DiagnosticMessage;
-        Cannot_find_name_0_Did_you_mean_the_static_member_1_0: DiagnosticMessage;
-        Cannot_find_name_0_Did_you_mean_the_instance_member_this_0: DiagnosticMessage;
-        Invalid_module_name_in_augmentation_module_0_cannot_be_found: DiagnosticMessage;
-        Invalid_module_name_in_augmentation_Module_0_resolves_to_an_untyped_module_at_1_which_cannot_be_augmented: DiagnosticMessage;
-        Exports_and_export_assignments_are_not_permitted_in_module_augmentations: DiagnosticMessage;
-        Imports_are_not_permitted_in_module_augmentations_Consider_moving_them_to_the_enclosing_external_module: DiagnosticMessage;
-        export_modifier_cannot_be_applied_to_ambient_modules_and_module_augmentations_since_they_are_always_visible: DiagnosticMessage;
-        Augmentations_for_the_global_scope_can_only_be_directly_nested_in_external_modules_or_ambient_module_declarations: DiagnosticMessage;
-        Augmentations_for_the_global_scope_should_have_declare_modifier_unless_they_appear_in_already_ambient_context: DiagnosticMessage;
-        Cannot_augment_module_0_because_it_resolves_to_a_non_module_entity: DiagnosticMessage;
-        Cannot_assign_a_0_constructor_type_to_a_1_constructor_type: DiagnosticMessage;
-        Constructor_of_class_0_is_private_and_only_accessible_within_the_class_declaration: DiagnosticMessage;
-        Constructor_of_class_0_is_protected_and_only_accessible_within_the_class_declaration: DiagnosticMessage;
-        Cannot_extend_a_class_0_Class_constructor_is_marked_as_private: DiagnosticMessage;
-        Accessors_must_both_be_abstract_or_non_abstract: DiagnosticMessage;
-        A_type_predicate_s_type_must_be_assignable_to_its_parameter_s_type: DiagnosticMessage;
-        Type_0_is_not_comparable_to_type_1: DiagnosticMessage;
-        A_function_that_is_called_with_the_new_keyword_cannot_have_a_this_type_that_is_void: DiagnosticMessage;
-        A_0_parameter_must_be_the_first_parameter: DiagnosticMessage;
-        A_constructor_cannot_have_a_this_parameter: DiagnosticMessage;
-        get_and_set_accessor_must_have_the_same_this_type: DiagnosticMessage;
-        this_implicitly_has_type_any_because_it_does_not_have_a_type_annotation: DiagnosticMessage;
-        The_this_context_of_type_0_is_not_assignable_to_method_s_this_of_type_1: DiagnosticMessage;
-        The_this_types_of_each_signature_are_incompatible: DiagnosticMessage;
-        _0_refers_to_a_UMD_global_but_the_current_file_is_a_module_Consider_adding_an_import_instead: DiagnosticMessage;
-        All_declarations_of_0_must_have_identical_modifiers: DiagnosticMessage;
-        Cannot_find_type_definition_file_for_0: DiagnosticMessage;
-        Cannot_extend_an_interface_0_Did_you_mean_implements: DiagnosticMessage;
-        An_import_path_cannot_end_with_a_0_extension_Consider_importing_1_instead: DiagnosticMessage;
-        _0_is_a_primitive_but_1_is_a_wrapper_object_Prefer_using_0_when_possible: DiagnosticMessage;
-        _0_only_refers_to_a_type_but_is_being_used_as_a_value_here: DiagnosticMessage;
-        Namespace_0_has_no_exported_member_1: DiagnosticMessage;
-        Left_side_of_comma_operator_is_unused_and_has_no_side_effects: DiagnosticMessage;
-        The_Object_type_is_assignable_to_very_few_other_types_Did_you_mean_to_use_the_any_type_instead: DiagnosticMessage;
-        An_async_function_or_method_must_return_a_Promise_Make_sure_you_have_a_declaration_for_Promise_or_include_ES2015_in_your_lib_option: DiagnosticMessage;
-        Spread_types_may_only_be_created_from_object_types: DiagnosticMessage;
-        Static_property_0_conflicts_with_built_in_property_Function_0_of_constructor_function_1: DiagnosticMessage;
-        Rest_types_may_only_be_created_from_object_types: DiagnosticMessage;
-        The_target_of_an_object_rest_assignment_must_be_a_variable_or_a_property_access: DiagnosticMessage;
-        _0_only_refers_to_a_type_but_is_being_used_as_a_namespace_here: DiagnosticMessage;
-        The_operand_of_a_delete_operator_must_be_a_property_reference: DiagnosticMessage;
-        The_operand_of_a_delete_operator_cannot_be_a_read_only_property: DiagnosticMessage;
-        An_async_function_or_method_in_ES5_SlashES3_requires_the_Promise_constructor_Make_sure_you_have_a_declaration_for_the_Promise_constructor_or_include_ES2015_in_your_lib_option: DiagnosticMessage;
-        Required_type_parameters_may_not_follow_optional_type_parameters: DiagnosticMessage;
-        Generic_type_0_requires_between_1_and_2_type_arguments: DiagnosticMessage;
-        Cannot_use_namespace_0_as_a_value: DiagnosticMessage;
-        Cannot_use_namespace_0_as_a_type: DiagnosticMessage;
-        _0_are_specified_twice_The_attribute_named_0_will_be_overwritten: DiagnosticMessage;
-        A_dynamic_import_call_returns_a_Promise_Make_sure_you_have_a_declaration_for_Promise_or_include_ES2015_in_your_lib_option: DiagnosticMessage;
-        A_dynamic_import_call_in_ES5_SlashES3_requires_the_Promise_constructor_Make_sure_you_have_a_declaration_for_the_Promise_constructor_or_include_ES2015_in_your_lib_option: DiagnosticMessage;
-        Cannot_access_0_1_because_0_is_a_type_but_not_a_namespace_Did_you_mean_to_retrieve_the_type_of_the_property_1_in_0_with_0_1: DiagnosticMessage;
-        The_expression_of_an_export_assignment_must_be_an_identifier_or_qualified_name_in_an_ambient_context: DiagnosticMessage;
-        Abstract_property_0_in_class_1_cannot_be_accessed_in_the_constructor: DiagnosticMessage;
-        Type_parameter_0_has_a_circular_default: DiagnosticMessage;
-        Subsequent_property_declarations_must_have_the_same_type_Property_0_must_be_of_type_1_but_here_has_type_2: DiagnosticMessage;
-        Duplicate_declaration_0: DiagnosticMessage;
-        Type_0_is_not_assignable_to_type_1_Two_different_types_with_this_name_exist_but_they_are_unrelated: DiagnosticMessage;
-        Class_0_incorrectly_implements_class_1_Did_you_mean_to_extend_1_and_inherit_its_members_as_a_subclass: DiagnosticMessage;
-        Cannot_invoke_an_object_which_is_possibly_null: DiagnosticMessage;
-        Cannot_invoke_an_object_which_is_possibly_undefined: DiagnosticMessage;
-        Cannot_invoke_an_object_which_is_possibly_null_or_undefined: DiagnosticMessage;
-        Module_0_has_no_exported_member_1_Did_you_mean_2: DiagnosticMessage;
-        Class_name_cannot_be_Object_when_targeting_ES5_with_module_0: DiagnosticMessage;
-        Cannot_find_lib_definition_for_0: DiagnosticMessage;
-        Cannot_find_lib_definition_for_0_Did_you_mean_1: DiagnosticMessage;
-        Import_declaration_0_is_using_private_name_1: DiagnosticMessage;
-        Type_parameter_0_of_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
-        Type_parameter_0_of_exported_interface_has_or_is_using_private_name_1: DiagnosticMessage;
-        Type_parameter_0_of_constructor_signature_from_exported_interface_has_or_is_using_private_name_1: DiagnosticMessage;
-        Type_parameter_0_of_call_signature_from_exported_interface_has_or_is_using_private_name_1: DiagnosticMessage;
-        Type_parameter_0_of_public_static_method_from_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
-        Type_parameter_0_of_public_method_from_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
-        Type_parameter_0_of_method_from_exported_interface_has_or_is_using_private_name_1: DiagnosticMessage;
-        Type_parameter_0_of_exported_function_has_or_is_using_private_name_1: DiagnosticMessage;
-        Implements_clause_of_exported_class_0_has_or_is_using_private_name_1: DiagnosticMessage;
-        extends_clause_of_exported_class_0_has_or_is_using_private_name_1: DiagnosticMessage;
-        extends_clause_of_exported_interface_0_has_or_is_using_private_name_1: DiagnosticMessage;
-        Exported_variable_0_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: DiagnosticMessage;
-        Exported_variable_0_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
-        Exported_variable_0_has_or_is_using_private_name_1: DiagnosticMessage;
-        Public_static_property_0_of_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: DiagnosticMessage;
-        Public_static_property_0_of_exported_class_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
-        Public_static_property_0_of_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
-        Public_property_0_of_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: DiagnosticMessage;
-        Public_property_0_of_exported_class_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
-        Public_property_0_of_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
-        Property_0_of_exported_interface_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
-        Property_0_of_exported_interface_has_or_is_using_private_name_1: DiagnosticMessage;
-        Parameter_type_of_public_static_setter_0_from_exported_class_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
-        Parameter_type_of_public_static_setter_0_from_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
-        Parameter_type_of_public_setter_0_from_exported_class_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
-        Parameter_type_of_public_setter_0_from_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
-        Return_type_of_public_static_getter_0_from_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: DiagnosticMessage;
-        Return_type_of_public_static_getter_0_from_exported_class_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
-        Return_type_of_public_static_getter_0_from_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
-        Return_type_of_public_getter_0_from_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: DiagnosticMessage;
-        Return_type_of_public_getter_0_from_exported_class_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
-        Return_type_of_public_getter_0_from_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
-        Return_type_of_constructor_signature_from_exported_interface_has_or_is_using_name_0_from_private_module_1: DiagnosticMessage;
-        Return_type_of_constructor_signature_from_exported_interface_has_or_is_using_private_name_0: DiagnosticMessage;
-        Return_type_of_call_signature_from_exported_interface_has_or_is_using_name_0_from_private_module_1: DiagnosticMessage;
-        Return_type_of_call_signature_from_exported_interface_has_or_is_using_private_name_0: DiagnosticMessage;
-        Return_type_of_index_signature_from_exported_interface_has_or_is_using_name_0_from_private_module_1: DiagnosticMessage;
-        Return_type_of_index_signature_from_exported_interface_has_or_is_using_private_name_0: DiagnosticMessage;
-        Return_type_of_public_static_method_from_exported_class_has_or_is_using_name_0_from_external_module_1_but_cannot_be_named: DiagnosticMessage;
-        Return_type_of_public_static_method_from_exported_class_has_or_is_using_name_0_from_private_module_1: DiagnosticMessage;
-        Return_type_of_public_static_method_from_exported_class_has_or_is_using_private_name_0: DiagnosticMessage;
-        Return_type_of_public_method_from_exported_class_has_or_is_using_name_0_from_external_module_1_but_cannot_be_named: DiagnosticMessage;
-        Return_type_of_public_method_from_exported_class_has_or_is_using_name_0_from_private_module_1: DiagnosticMessage;
-        Return_type_of_public_method_from_exported_class_has_or_is_using_private_name_0: DiagnosticMessage;
-        Return_type_of_method_from_exported_interface_has_or_is_using_name_0_from_private_module_1: DiagnosticMessage;
-        Return_type_of_method_from_exported_interface_has_or_is_using_private_name_0: DiagnosticMessage;
-        Return_type_of_exported_function_has_or_is_using_name_0_from_external_module_1_but_cannot_be_named: DiagnosticMessage;
-        Return_type_of_exported_function_has_or_is_using_name_0_from_private_module_1: DiagnosticMessage;
-        Return_type_of_exported_function_has_or_is_using_private_name_0: DiagnosticMessage;
-        Parameter_0_of_constructor_from_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: DiagnosticMessage;
-        Parameter_0_of_constructor_from_exported_class_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
-        Parameter_0_of_constructor_from_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
-        Parameter_0_of_constructor_signature_from_exported_interface_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
-        Parameter_0_of_constructor_signature_from_exported_interface_has_or_is_using_private_name_1: DiagnosticMessage;
-        Parameter_0_of_call_signature_from_exported_interface_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
-        Parameter_0_of_call_signature_from_exported_interface_has_or_is_using_private_name_1: DiagnosticMessage;
-        Parameter_0_of_public_static_method_from_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: DiagnosticMessage;
-        Parameter_0_of_public_static_method_from_exported_class_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
-        Parameter_0_of_public_static_method_from_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
-        Parameter_0_of_public_method_from_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: DiagnosticMessage;
-        Parameter_0_of_public_method_from_exported_class_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
-        Parameter_0_of_public_method_from_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
-        Parameter_0_of_method_from_exported_interface_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
-        Parameter_0_of_method_from_exported_interface_has_or_is_using_private_name_1: DiagnosticMessage;
-        Parameter_0_of_exported_function_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: DiagnosticMessage;
-        Parameter_0_of_exported_function_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
-        Parameter_0_of_exported_function_has_or_is_using_private_name_1: DiagnosticMessage;
-        Exported_type_alias_0_has_or_is_using_private_name_1: DiagnosticMessage;
-        Default_export_of_the_module_has_or_is_using_private_name_0: DiagnosticMessage;
-        Type_parameter_0_of_exported_type_alias_has_or_is_using_private_name_1: DiagnosticMessage;
-        Conflicting_definitions_for_0_found_at_1_and_2_Consider_installing_a_specific_version_of_this_library_to_resolve_the_conflict: DiagnosticMessage;
-        Parameter_0_of_index_signature_from_exported_interface_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
-        Parameter_0_of_index_signature_from_exported_interface_has_or_is_using_private_name_1: DiagnosticMessage;
-        Property_0_of_exported_class_expression_may_not_be_private_or_protected: DiagnosticMessage;
-        Public_static_method_0_of_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: DiagnosticMessage;
-        Public_static_method_0_of_exported_class_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
-        Public_static_method_0_of_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
-        Public_method_0_of_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: DiagnosticMessage;
-        Public_method_0_of_exported_class_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
-        Public_method_0_of_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
-        Method_0_of_exported_interface_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
-        Method_0_of_exported_interface_has_or_is_using_private_name_1: DiagnosticMessage;
-        The_current_host_does_not_support_the_0_option: DiagnosticMessage;
-        Cannot_find_the_common_subdirectory_path_for_the_input_files: DiagnosticMessage;
-        File_specification_cannot_end_in_a_recursive_directory_wildcard_Asterisk_Asterisk_Colon_0: DiagnosticMessage;
-        Cannot_read_file_0_Colon_1: DiagnosticMessage;
-        Failed_to_parse_file_0_Colon_1: DiagnosticMessage;
-        Unknown_compiler_option_0: DiagnosticMessage;
-        Compiler_option_0_requires_a_value_of_type_1: DiagnosticMessage;
-        Could_not_write_file_0_Colon_1: DiagnosticMessage;
-        Option_project_cannot_be_mixed_with_source_files_on_a_command_line: DiagnosticMessage;
-        Option_isolatedModules_can_only_be_used_when_either_option_module_is_provided_or_option_target_is_ES2015_or_higher: DiagnosticMessage;
-        Option_0_can_only_be_used_when_either_option_inlineSourceMap_or_option_sourceMap_is_provided: DiagnosticMessage;
-        Option_0_cannot_be_specified_without_specifying_option_1: DiagnosticMessage;
-        Option_0_cannot_be_specified_with_option_1: DiagnosticMessage;
-        A_tsconfig_json_file_is_already_defined_at_Colon_0: DiagnosticMessage;
-        Cannot_write_file_0_because_it_would_overwrite_input_file: DiagnosticMessage;
-        Cannot_write_file_0_because_it_would_be_overwritten_by_multiple_input_files: DiagnosticMessage;
-        Cannot_find_a_tsconfig_json_file_at_the_specified_directory_Colon_0: DiagnosticMessage;
-        The_specified_path_does_not_exist_Colon_0: DiagnosticMessage;
-        Invalid_value_for_reactNamespace_0_is_not_a_valid_identifier: DiagnosticMessage;
-        Option_paths_cannot_be_used_without_specifying_baseUrl_option: DiagnosticMessage;
-        Pattern_0_can_have_at_most_one_Asterisk_character: DiagnosticMessage;
-        Substitution_0_in_pattern_1_in_can_have_at_most_one_Asterisk_character: DiagnosticMessage;
-        Substitutions_for_pattern_0_should_be_an_array: DiagnosticMessage;
-        Substitution_0_for_pattern_1_has_incorrect_type_expected_string_got_2: DiagnosticMessage;
-        File_specification_cannot_contain_a_parent_directory_that_appears_after_a_recursive_directory_wildcard_Asterisk_Asterisk_Colon_0: DiagnosticMessage;
-        Substitutions_for_pattern_0_shouldn_t_be_an_empty_array: DiagnosticMessage;
-        Invalid_value_for_jsxFactory_0_is_not_a_valid_identifier_or_qualified_name: DiagnosticMessage;
-        Adding_a_tsconfig_json_file_will_help_organize_projects_that_contain_both_TypeScript_and_JavaScript_files_Learn_more_at_https_Colon_Slash_Slashaka_ms_Slashtsconfig: DiagnosticMessage;
-        Option_0_cannot_be_specified_without_specifying_option_1_or_option_2: DiagnosticMessage;
-        Option_resolveJsonModule_cannot_be_specified_without_node_module_resolution_strategy: DiagnosticMessage;
-        Generates_a_sourcemap_for_each_corresponding_d_ts_file: DiagnosticMessage;
-        Concatenate_and_emit_output_to_single_file: DiagnosticMessage;
-        Generates_corresponding_d_ts_file: DiagnosticMessage;
-        Specify_the_location_where_debugger_should_locate_map_files_instead_of_generated_locations: DiagnosticMessage;
-        Specify_the_location_where_debugger_should_locate_TypeScript_files_instead_of_source_locations: DiagnosticMessage;
-        Watch_input_files: DiagnosticMessage;
-        Redirect_output_structure_to_the_directory: DiagnosticMessage;
-        Do_not_erase_const_enum_declarations_in_generated_code: DiagnosticMessage;
-        Do_not_emit_outputs_if_any_errors_were_reported: DiagnosticMessage;
-        Do_not_emit_comments_to_output: DiagnosticMessage;
-        Do_not_emit_outputs: DiagnosticMessage;
-        Allow_default_imports_from_modules_with_no_default_export_This_does_not_affect_code_emit_just_typechecking: DiagnosticMessage;
-        Skip_type_checking_of_declaration_files: DiagnosticMessage;
-        Do_not_resolve_the_real_path_of_symlinks: DiagnosticMessage;
-        Only_emit_d_ts_declaration_files: DiagnosticMessage;
-        Specify_ECMAScript_target_version_Colon_ES3_default_ES5_ES2015_ES2016_ES2017_ES2018_or_ESNEXT: DiagnosticMessage;
-        Specify_module_code_generation_Colon_none_commonjs_amd_system_umd_es2015_or_ESNext: DiagnosticMessage;
-        Print_this_message: DiagnosticMessage;
-        Print_the_compiler_s_version: DiagnosticMessage;
-        Compile_the_project_given_the_path_to_its_configuration_file_or_to_a_folder_with_a_tsconfig_json: DiagnosticMessage;
-        Syntax_Colon_0: DiagnosticMessage;
-        options: DiagnosticMessage;
-        file: DiagnosticMessage;
-        Examples_Colon_0: DiagnosticMessage;
-        Options_Colon: DiagnosticMessage;
-        Version_0: DiagnosticMessage;
-        Insert_command_line_options_and_files_from_a_file: DiagnosticMessage;
-        Starting_compilation_in_watch_mode: DiagnosticMessage;
-        File_change_detected_Starting_incremental_compilation: DiagnosticMessage;
-        KIND: DiagnosticMessage;
-        FILE: DiagnosticMessage;
-        VERSION: DiagnosticMessage;
-        LOCATION: DiagnosticMessage;
-        DIRECTORY: DiagnosticMessage;
-        STRATEGY: DiagnosticMessage;
-        FILE_OR_DIRECTORY: DiagnosticMessage;
-        Generates_corresponding_map_file: DiagnosticMessage;
-        Compiler_option_0_expects_an_argument: DiagnosticMessage;
-        Unterminated_quoted_string_in_response_file_0: DiagnosticMessage;
-        Argument_for_0_option_must_be_Colon_1: DiagnosticMessage;
-        Locale_must_be_of_the_form_language_or_language_territory_For_example_0_or_1: DiagnosticMessage;
-        Unsupported_locale_0: DiagnosticMessage;
-        Unable_to_open_file_0: DiagnosticMessage;
-        Corrupted_locale_file_0: DiagnosticMessage;
-        Raise_error_on_expressions_and_declarations_with_an_implied_any_type: DiagnosticMessage;
-        File_0_not_found: DiagnosticMessage;
-        File_0_has_unsupported_extension_The_only_supported_extensions_are_1: DiagnosticMessage;
-        Suppress_noImplicitAny_errors_for_indexing_objects_lacking_index_signatures: DiagnosticMessage;
-        Do_not_emit_declarations_for_code_that_has_an_internal_annotation: DiagnosticMessage;
-        Specify_the_root_directory_of_input_files_Use_to_control_the_output_directory_structure_with_outDir: DiagnosticMessage;
-        File_0_is_not_under_rootDir_1_rootDir_is_expected_to_contain_all_source_files: DiagnosticMessage;
-        Specify_the_end_of_line_sequence_to_be_used_when_emitting_files_Colon_CRLF_dos_or_LF_unix: DiagnosticMessage;
-        NEWLINE: DiagnosticMessage;
-        Option_0_can_only_be_specified_in_tsconfig_json_file: DiagnosticMessage;
-        Enables_experimental_support_for_ES7_decorators: DiagnosticMessage;
-        Enables_experimental_support_for_emitting_type_metadata_for_decorators: DiagnosticMessage;
-        Enables_experimental_support_for_ES7_async_functions: DiagnosticMessage;
-        Specify_module_resolution_strategy_Colon_node_Node_js_or_classic_TypeScript_pre_1_6: DiagnosticMessage;
-        Initializes_a_TypeScript_project_and_creates_a_tsconfig_json_file: DiagnosticMessage;
-        Successfully_created_a_tsconfig_json_file: DiagnosticMessage;
-        Suppress_excess_property_checks_for_object_literals: DiagnosticMessage;
-        Stylize_errors_and_messages_using_color_and_context_experimental: DiagnosticMessage;
-        Do_not_report_errors_on_unused_labels: DiagnosticMessage;
-        Report_error_when_not_all_code_paths_in_function_return_a_value: DiagnosticMessage;
-        Report_errors_for_fallthrough_cases_in_switch_statement: DiagnosticMessage;
-        Do_not_report_errors_on_unreachable_code: DiagnosticMessage;
-        Disallow_inconsistently_cased_references_to_the_same_file: DiagnosticMessage;
-        Specify_library_files_to_be_included_in_the_compilation: DiagnosticMessage;
-        Specify_JSX_code_generation_Colon_preserve_react_native_or_react: DiagnosticMessage;
-        File_0_has_an_unsupported_extension_so_skipping_it: DiagnosticMessage;
-        Only_amd_and_system_modules_are_supported_alongside_0: DiagnosticMessage;
-        Base_directory_to_resolve_non_absolute_module_names: DiagnosticMessage;
-        Deprecated_Use_jsxFactory_instead_Specify_the_object_invoked_for_createElement_when_targeting_react_JSX_emit: DiagnosticMessage;
-        Enable_tracing_of_the_name_resolution_process: DiagnosticMessage;
-        Resolving_module_0_from_1: DiagnosticMessage;
-        Explicitly_specified_module_resolution_kind_Colon_0: DiagnosticMessage;
-        Module_resolution_kind_is_not_specified_using_0: DiagnosticMessage;
-        Module_name_0_was_successfully_resolved_to_1: DiagnosticMessage;
-        Module_name_0_was_not_resolved: DiagnosticMessage;
-        paths_option_is_specified_looking_for_a_pattern_to_match_module_name_0: DiagnosticMessage;
-        Module_name_0_matched_pattern_1: DiagnosticMessage;
-        Trying_substitution_0_candidate_module_location_Colon_1: DiagnosticMessage;
-        Resolving_module_name_0_relative_to_base_url_1_2: DiagnosticMessage;
-        Loading_module_as_file_Slash_folder_candidate_module_location_0_target_file_type_1: DiagnosticMessage;
-        File_0_does_not_exist: DiagnosticMessage;
-        File_0_exist_use_it_as_a_name_resolution_result: DiagnosticMessage;
-        Loading_module_0_from_node_modules_folder_target_file_type_1: DiagnosticMessage;
-        Found_package_json_at_0: DiagnosticMessage;
-        package_json_does_not_have_a_0_field: DiagnosticMessage;
-        package_json_has_0_field_1_that_references_2: DiagnosticMessage;
-        Allow_javascript_files_to_be_compiled: DiagnosticMessage;
-        Option_0_should_have_array_of_strings_as_a_value: DiagnosticMessage;
-        Checking_if_0_is_the_longest_matching_prefix_for_1_2: DiagnosticMessage;
-        Expected_type_of_0_field_in_package_json_to_be_string_got_1: DiagnosticMessage;
-        baseUrl_option_is_set_to_0_using_this_value_to_resolve_non_relative_module_name_1: DiagnosticMessage;
-        rootDirs_option_is_set_using_it_to_resolve_relative_module_name_0: DiagnosticMessage;
-        Longest_matching_prefix_for_0_is_1: DiagnosticMessage;
-        Loading_0_from_the_root_dir_1_candidate_location_2: DiagnosticMessage;
-        Trying_other_entries_in_rootDirs: DiagnosticMessage;
-        Module_resolution_using_rootDirs_has_failed: DiagnosticMessage;
-        Do_not_emit_use_strict_directives_in_module_output: DiagnosticMessage;
-        Enable_strict_null_checks: DiagnosticMessage;
-        Unknown_option_excludes_Did_you_mean_exclude: DiagnosticMessage;
-        Raise_error_on_this_expressions_with_an_implied_any_type: DiagnosticMessage;
-        Resolving_type_reference_directive_0_containing_file_1_root_directory_2: DiagnosticMessage;
-        Resolving_using_primary_search_paths: DiagnosticMessage;
-        Resolving_from_node_modules_folder: DiagnosticMessage;
-        Type_reference_directive_0_was_successfully_resolved_to_1_primary_Colon_2: DiagnosticMessage;
-        Type_reference_directive_0_was_not_resolved: DiagnosticMessage;
-        Resolving_with_primary_search_path_0: DiagnosticMessage;
-        Root_directory_cannot_be_determined_skipping_primary_search_paths: DiagnosticMessage;
-        Resolving_type_reference_directive_0_containing_file_1_root_directory_not_set: DiagnosticMessage;
-        Type_declaration_files_to_be_included_in_compilation: DiagnosticMessage;
-        Looking_up_in_node_modules_folder_initial_location_0: DiagnosticMessage;
-        Containing_file_is_not_specified_and_root_directory_cannot_be_determined_skipping_lookup_in_node_modules_folder: DiagnosticMessage;
-        Resolving_type_reference_directive_0_containing_file_not_set_root_directory_1: DiagnosticMessage;
-        Resolving_type_reference_directive_0_containing_file_not_set_root_directory_not_set: DiagnosticMessage;
-        Resolving_real_path_for_0_result_1: DiagnosticMessage;
-        Cannot_compile_modules_using_option_0_unless_the_module_flag_is_amd_or_system: DiagnosticMessage;
-        File_name_0_has_a_1_extension_stripping_it: DiagnosticMessage;
-        _0_is_declared_but_its_value_is_never_read: DiagnosticMessage;
-        Report_errors_on_unused_locals: DiagnosticMessage;
-        Report_errors_on_unused_parameters: DiagnosticMessage;
-        The_maximum_dependency_depth_to_search_under_node_modules_and_load_JavaScript_files: DiagnosticMessage;
-        Cannot_import_type_declaration_files_Consider_importing_0_instead_of_1: DiagnosticMessage;
-        Property_0_is_declared_but_its_value_is_never_read: DiagnosticMessage;
-        Import_emit_helpers_from_tslib: DiagnosticMessage;
-        Auto_discovery_for_typings_is_enabled_in_project_0_Running_extra_resolution_pass_for_module_1_using_cache_location_2: DiagnosticMessage;
-        Parse_in_strict_mode_and_emit_use_strict_for_each_source_file: DiagnosticMessage;
-        Module_0_was_resolved_to_1_but_jsx_is_not_set: DiagnosticMessage;
-        Module_0_was_resolved_as_locally_declared_ambient_module_in_file_1: DiagnosticMessage;
-        Module_0_was_resolved_as_ambient_module_declared_in_1_since_this_file_was_not_modified: DiagnosticMessage;
-        Specify_the_JSX_factory_function_to_use_when_targeting_react_JSX_emit_e_g_React_createElement_or_h: DiagnosticMessage;
-        Resolution_for_module_0_was_found_in_cache_from_location_1: DiagnosticMessage;
-        Directory_0_does_not_exist_skipping_all_lookups_in_it: DiagnosticMessage;
-        Show_diagnostic_information: DiagnosticMessage;
-        Show_verbose_diagnostic_information: DiagnosticMessage;
-        Emit_a_single_file_with_source_maps_instead_of_having_a_separate_file: DiagnosticMessage;
-        Emit_the_source_alongside_the_sourcemaps_within_a_single_file_requires_inlineSourceMap_or_sourceMap_to_be_set: DiagnosticMessage;
-        Transpile_each_file_as_a_separate_module_similar_to_ts_transpileModule: DiagnosticMessage;
-        Print_names_of_generated_files_part_of_the_compilation: DiagnosticMessage;
-        Print_names_of_files_part_of_the_compilation: DiagnosticMessage;
-        The_locale_used_when_displaying_messages_to_the_user_e_g_en_us: DiagnosticMessage;
-        Do_not_generate_custom_helper_functions_like_extends_in_compiled_output: DiagnosticMessage;
-        Do_not_include_the_default_library_file_lib_d_ts: DiagnosticMessage;
-        Do_not_add_triple_slash_references_or_imported_modules_to_the_list_of_compiled_files: DiagnosticMessage;
-        Deprecated_Use_skipLibCheck_instead_Skip_type_checking_of_default_library_declaration_files: DiagnosticMessage;
-        List_of_folders_to_include_type_definitions_from: DiagnosticMessage;
-        Disable_size_limitations_on_JavaScript_projects: DiagnosticMessage;
-        The_character_set_of_the_input_files: DiagnosticMessage;
-        Emit_a_UTF_8_Byte_Order_Mark_BOM_in_the_beginning_of_output_files: DiagnosticMessage;
-        Do_not_truncate_error_messages: DiagnosticMessage;
-        Output_directory_for_generated_declaration_files: DiagnosticMessage;
-        A_series_of_entries_which_re_map_imports_to_lookup_locations_relative_to_the_baseUrl: DiagnosticMessage;
-        List_of_root_folders_whose_combined_content_represents_the_structure_of_the_project_at_runtime: DiagnosticMessage;
-        Show_all_compiler_options: DiagnosticMessage;
-        Deprecated_Use_outFile_instead_Concatenate_and_emit_output_to_single_file: DiagnosticMessage;
-        Command_line_Options: DiagnosticMessage;
-        Basic_Options: DiagnosticMessage;
-        Strict_Type_Checking_Options: DiagnosticMessage;
-        Module_Resolution_Options: DiagnosticMessage;
-        Source_Map_Options: DiagnosticMessage;
-        Additional_Checks: DiagnosticMessage;
-        Experimental_Options: DiagnosticMessage;
-        Advanced_Options: DiagnosticMessage;
-        Provide_full_support_for_iterables_in_for_of_spread_and_destructuring_when_targeting_ES5_or_ES3: DiagnosticMessage;
-        Enable_all_strict_type_checking_options: DiagnosticMessage;
-        List_of_language_service_plugins: DiagnosticMessage;
-        Scoped_package_detected_looking_in_0: DiagnosticMessage;
-        Reusing_resolution_of_module_0_to_file_1_from_old_program: DiagnosticMessage;
-        Reusing_module_resolutions_originating_in_0_since_resolutions_are_unchanged_from_old_program: DiagnosticMessage;
-        Disable_strict_checking_of_generic_signatures_in_function_types: DiagnosticMessage;
-        Enable_strict_checking_of_function_types: DiagnosticMessage;
-        Enable_strict_checking_of_property_initialization_in_classes: DiagnosticMessage;
-        Numeric_separators_are_not_allowed_here: DiagnosticMessage;
-        Multiple_consecutive_numeric_separators_are_not_permitted: DiagnosticMessage;
-        Found_package_json_at_0_Package_ID_is_1: DiagnosticMessage;
-        Whether_to_keep_outdated_console_output_in_watch_mode_instead_of_clearing_the_screen: DiagnosticMessage;
-        All_imports_in_import_declaration_are_unused: DiagnosticMessage;
-        Found_1_error_Watching_for_file_changes: DiagnosticMessage;
-        Found_0_errors_Watching_for_file_changes: DiagnosticMessage;
-        Resolve_keyof_to_string_valued_property_names_only_no_numbers_or_symbols: DiagnosticMessage;
-        _0_is_declared_but_never_used: DiagnosticMessage;
-        Include_modules_imported_with_json_extension: DiagnosticMessage;
-        All_destructured_elements_are_unused: DiagnosticMessage;
-        All_variables_are_unused: DiagnosticMessage;
-        Projects_to_reference: DiagnosticMessage;
-        Enable_project_compilation: DiagnosticMessage;
-        Project_references_may_not_form_a_circular_graph_Cycle_detected_Colon_0: DiagnosticMessage;
-        Composite_projects_may_not_disable_declaration_emit: DiagnosticMessage;
-        Output_file_0_has_not_been_built_from_source_file_1: DiagnosticMessage;
-        Referenced_project_0_must_have_setting_composite_Colon_true: DiagnosticMessage;
-        File_0_is_not_in_project_file_list_Projects_must_list_all_files_or_use_an_include_pattern: DiagnosticMessage;
-        Cannot_prepend_project_0_because_it_does_not_have_outFile_set: DiagnosticMessage;
-        Output_file_0_from_project_1_does_not_exist: DiagnosticMessage;
-        Project_0_is_out_of_date_because_oldest_output_1_is_older_than_newest_input_2: DiagnosticMessage;
-        Project_0_is_up_to_date_because_newest_input_1_is_older_than_oldest_output_2: DiagnosticMessage;
-        Project_0_is_out_of_date_because_output_file_1_does_not_exist: DiagnosticMessage;
-        Project_0_is_out_of_date_because_its_dependency_1_is_out_of_date: DiagnosticMessage;
-        Project_0_is_up_to_date_with_d_ts_files_from_its_dependencies: DiagnosticMessage;
-        Projects_in_this_build_Colon_0: DiagnosticMessage;
-        A_non_dry_build_would_delete_the_following_files_Colon_0: DiagnosticMessage;
-        A_non_dry_build_would_build_project_0: DiagnosticMessage;
-        Building_project_0: DiagnosticMessage;
-        Updating_output_timestamps_of_project_0: DiagnosticMessage;
-        delete_this_Project_0_is_up_to_date_because_it_was_previously_built: DiagnosticMessage;
-        Project_0_is_up_to_date: DiagnosticMessage;
-        Skipping_build_of_project_0_because_its_dependency_1_has_errors: DiagnosticMessage;
-        Project_0_can_t_be_built_because_its_dependency_1_has_errors: DiagnosticMessage;
-        Build_one_or_more_projects_and_their_dependencies_if_out_of_date: DiagnosticMessage;
-        Delete_the_outputs_of_all_projects: DiagnosticMessage;
-        Enable_verbose_logging: DiagnosticMessage;
-        Show_what_would_be_built_or_deleted_if_specified_with_clean: DiagnosticMessage;
-        Build_all_projects_including_those_that_appear_to_be_up_to_date: DiagnosticMessage;
-        Option_build_must_be_the_first_command_line_argument: DiagnosticMessage;
-        Options_0_and_1_cannot_be_combined: DiagnosticMessage;
-        Skipping_clean_because_not_all_projects_could_be_located: DiagnosticMessage;
-        Variable_0_implicitly_has_an_1_type: DiagnosticMessage;
-        Parameter_0_implicitly_has_an_1_type: DiagnosticMessage;
-        Member_0_implicitly_has_an_1_type: DiagnosticMessage;
-        new_expression_whose_target_lacks_a_construct_signature_implicitly_has_an_any_type: DiagnosticMessage;
-        _0_which_lacks_return_type_annotation_implicitly_has_an_1_return_type: DiagnosticMessage;
-        Function_expression_which_lacks_return_type_annotation_implicitly_has_an_0_return_type: DiagnosticMessage;
-        Construct_signature_which_lacks_return_type_annotation_implicitly_has_an_any_return_type: DiagnosticMessage;
-        Element_implicitly_has_an_any_type_because_index_expression_is_not_of_type_number: DiagnosticMessage;
-        Could_not_find_a_declaration_file_for_module_0_1_implicitly_has_an_any_type: DiagnosticMessage;
-        Element_implicitly_has_an_any_type_because_type_0_has_no_index_signature: DiagnosticMessage;
-        Object_literal_s_property_0_implicitly_has_an_1_type: DiagnosticMessage;
-        Rest_parameter_0_implicitly_has_an_any_type: DiagnosticMessage;
-        Call_signature_which_lacks_return_type_annotation_implicitly_has_an_any_return_type: DiagnosticMessage;
-        _0_implicitly_has_type_any_because_it_does_not_have_a_type_annotation_and_is_referenced_directly_or_indirectly_in_its_own_initializer: DiagnosticMessage;
-        _0_implicitly_has_return_type_any_because_it_does_not_have_a_return_type_annotation_and_is_referenced_directly_or_indirectly_in_one_of_its_return_expressions: DiagnosticMessage;
-        Function_implicitly_has_return_type_any_because_it_does_not_have_a_return_type_annotation_and_is_referenced_directly_or_indirectly_in_one_of_its_return_expressions: DiagnosticMessage;
-        Generator_implicitly_has_type_0_because_it_does_not_yield_any_values_Consider_supplying_a_return_type: DiagnosticMessage;
-        JSX_element_implicitly_has_type_any_because_no_interface_JSX_0_exists: DiagnosticMessage;
-        Unreachable_code_detected: DiagnosticMessage;
-        Unused_label: DiagnosticMessage;
-        Fallthrough_case_in_switch: DiagnosticMessage;
-        Not_all_code_paths_return_a_value: DiagnosticMessage;
-        Binding_element_0_implicitly_has_an_1_type: DiagnosticMessage;
-        Property_0_implicitly_has_type_any_because_its_set_accessor_lacks_a_parameter_type_annotation: DiagnosticMessage;
-        Property_0_implicitly_has_type_any_because_its_get_accessor_lacks_a_return_type_annotation: DiagnosticMessage;
-        Variable_0_implicitly_has_type_1_in_some_locations_where_its_type_cannot_be_determined: DiagnosticMessage;
-        Try_npm_install_types_Slash_0_if_it_exists_or_add_a_new_declaration_d_ts_file_containing_declare_module_0: DiagnosticMessage;
-        Dynamic_import_s_specifier_must_be_of_type_string_but_here_has_type_0: DiagnosticMessage;
-        Enables_emit_interoperability_between_CommonJS_and_ES_Modules_via_creation_of_namespace_objects_for_all_imports_Implies_allowSyntheticDefaultImports: DiagnosticMessage;
-        A_namespace_style_import_cannot_be_called_or_constructed_and_will_cause_a_failure_at_runtime: DiagnosticMessage;
-        Mapped_object_type_implicitly_has_an_any_template_type: DiagnosticMessage;
-        You_cannot_rename_this_element: DiagnosticMessage;
-        You_cannot_rename_elements_that_are_defined_in_the_standard_TypeScript_library: DiagnosticMessage;
-        import_can_only_be_used_in_a_ts_file: DiagnosticMessage;
-        export_can_only_be_used_in_a_ts_file: DiagnosticMessage;
-        type_parameter_declarations_can_only_be_used_in_a_ts_file: DiagnosticMessage;
-        implements_clauses_can_only_be_used_in_a_ts_file: DiagnosticMessage;
-        interface_declarations_can_only_be_used_in_a_ts_file: DiagnosticMessage;
-        module_declarations_can_only_be_used_in_a_ts_file: DiagnosticMessage;
-        type_aliases_can_only_be_used_in_a_ts_file: DiagnosticMessage;
-        _0_can_only_be_used_in_a_ts_file: DiagnosticMessage;
-        types_can_only_be_used_in_a_ts_file: DiagnosticMessage;
-        type_arguments_can_only_be_used_in_a_ts_file: DiagnosticMessage;
-        parameter_modifiers_can_only_be_used_in_a_ts_file: DiagnosticMessage;
-        non_null_assertions_can_only_be_used_in_a_ts_file: DiagnosticMessage;
-        enum_declarations_can_only_be_used_in_a_ts_file: DiagnosticMessage;
-        type_assertion_expressions_can_only_be_used_in_a_ts_file: DiagnosticMessage;
-        Octal_literal_types_must_use_ES2015_syntax_Use_the_syntax_0: DiagnosticMessage;
-        Octal_literals_are_not_allowed_in_enums_members_initializer_Use_the_syntax_0: DiagnosticMessage;
-        Report_errors_in_js_files: DiagnosticMessage;
-        JSDoc_types_can_only_be_used_inside_documentation_comments: DiagnosticMessage;
-        JSDoc_typedef_tag_should_either_have_a_type_annotation_or_be_followed_by_property_or_member_tags: DiagnosticMessage;
-        JSDoc_0_is_not_attached_to_a_class: DiagnosticMessage;
-        JSDoc_0_1_does_not_match_the_extends_2_clause: DiagnosticMessage;
-        JSDoc_param_tag_has_name_0_but_there_is_no_parameter_with_that_name: DiagnosticMessage;
-        Class_declarations_cannot_have_more_than_one_augments_or_extends_tag: DiagnosticMessage;
-        Expected_0_type_arguments_provide_these_with_an_extends_tag: DiagnosticMessage;
-        Expected_0_1_type_arguments_provide_these_with_an_extends_tag: DiagnosticMessage;
-        JSDoc_may_only_appear_in_the_last_parameter_of_a_signature: DiagnosticMessage;
-        JSDoc_param_tag_has_name_0_but_there_is_no_parameter_with_that_name_It_would_match_arguments_if_it_had_an_array_type: DiagnosticMessage;
-        Only_identifiers_Slashqualified_names_with_optional_type_arguments_are_currently_supported_in_a_class_extends_clause: DiagnosticMessage;
-        class_expressions_are_not_currently_supported: DiagnosticMessage;
-        Language_service_is_disabled: DiagnosticMessage;
-        JSX_attributes_must_only_be_assigned_a_non_empty_expression: DiagnosticMessage;
-        JSX_elements_cannot_have_multiple_attributes_with_the_same_name: DiagnosticMessage;
-        Expected_corresponding_JSX_closing_tag_for_0: DiagnosticMessage;
-        JSX_attribute_expected: DiagnosticMessage;
-        Cannot_use_JSX_unless_the_jsx_flag_is_provided: DiagnosticMessage;
-        A_constructor_cannot_contain_a_super_call_when_its_class_extends_null: DiagnosticMessage;
-        An_unary_expression_with_the_0_operator_is_not_allowed_in_the_left_hand_side_of_an_exponentiation_expression_Consider_enclosing_the_expression_in_parentheses: DiagnosticMessage;
-        A_type_assertion_expression_is_not_allowed_in_the_left_hand_side_of_an_exponentiation_expression_Consider_enclosing_the_expression_in_parentheses: DiagnosticMessage;
-        JSX_element_0_has_no_corresponding_closing_tag: DiagnosticMessage;
-        super_must_be_called_before_accessing_this_in_the_constructor_of_a_derived_class: DiagnosticMessage;
-        Unknown_type_acquisition_option_0: DiagnosticMessage;
-        super_must_be_called_before_accessing_a_property_of_super_in_the_constructor_of_a_derived_class: DiagnosticMessage;
-        _0_is_not_a_valid_meta_property_for_keyword_1_Did_you_mean_2: DiagnosticMessage;
-        Meta_property_0_is_only_allowed_in_the_body_of_a_function_declaration_function_expression_or_constructor: DiagnosticMessage;
-        JSX_fragment_has_no_corresponding_closing_tag: DiagnosticMessage;
-        Expected_corresponding_closing_tag_for_JSX_fragment: DiagnosticMessage;
-        JSX_fragment_is_not_supported_when_using_jsxFactory: DiagnosticMessage;
-        JSX_fragment_is_not_supported_when_using_an_inline_JSX_factory_pragma: DiagnosticMessage;
-        Circularity_detected_while_resolving_configuration_Colon_0: DiagnosticMessage;
-        A_path_in_an_extends_option_must_be_relative_or_rooted_but_0_is_not: DiagnosticMessage;
-        The_files_list_in_config_file_0_is_empty: DiagnosticMessage;
-        No_inputs_were_found_in_config_file_0_Specified_include_paths_were_1_and_exclude_paths_were_2: DiagnosticMessage;
-        File_is_a_CommonJS_module_it_may_be_converted_to_an_ES6_module: DiagnosticMessage;
-        This_constructor_function_may_be_converted_to_a_class_declaration: DiagnosticMessage;
-        Import_may_be_converted_to_a_default_import: DiagnosticMessage;
-        JSDoc_types_may_be_moved_to_TypeScript_types: DiagnosticMessage;
-        require_call_may_be_converted_to_an_import: DiagnosticMessage;
-        Add_missing_super_call: DiagnosticMessage;
-        Make_super_call_the_first_statement_in_the_constructor: DiagnosticMessage;
-        Change_extends_to_implements: DiagnosticMessage;
-        Remove_declaration_for_Colon_0: DiagnosticMessage;
-        Remove_import_from_0: DiagnosticMessage;
-        Implement_interface_0: DiagnosticMessage;
-        Implement_inherited_abstract_class: DiagnosticMessage;
-        Add_0_to_unresolved_variable: DiagnosticMessage;
-        Remove_destructuring: DiagnosticMessage;
-        Remove_variable_statement: DiagnosticMessage;
-        Import_0_from_module_1: DiagnosticMessage;
-        Change_0_to_1: DiagnosticMessage;
-        Add_0_to_existing_import_declaration_from_1: DiagnosticMessage;
-        Declare_property_0: DiagnosticMessage;
-        Add_index_signature_for_property_0: DiagnosticMessage;
-        Disable_checking_for_this_file: DiagnosticMessage;
-        Ignore_this_error_message: DiagnosticMessage;
-        Initialize_property_0_in_the_constructor: DiagnosticMessage;
-        Initialize_static_property_0: DiagnosticMessage;
-        Change_spelling_to_0: DiagnosticMessage;
-        Declare_method_0: DiagnosticMessage;
-        Declare_static_method_0: DiagnosticMessage;
-        Prefix_0_with_an_underscore: DiagnosticMessage;
-        Rewrite_as_the_indexed_access_type_0: DiagnosticMessage;
-        Declare_static_property_0: DiagnosticMessage;
-        Call_decorator_expression: DiagnosticMessage;
-        Add_async_modifier_to_containing_function: DiagnosticMessage;
-        Convert_function_to_an_ES2015_class: DiagnosticMessage;
-        Convert_function_0_to_class: DiagnosticMessage;
-        Extract_to_0_in_1: DiagnosticMessage;
-        Extract_function: DiagnosticMessage;
-        Extract_constant: DiagnosticMessage;
-        Extract_to_0_in_enclosing_scope: DiagnosticMessage;
-        Extract_to_0_in_1_scope: DiagnosticMessage;
-        Annotate_with_type_from_JSDoc: DiagnosticMessage;
-        Annotate_with_types_from_JSDoc: DiagnosticMessage;
-        Infer_type_of_0_from_usage: DiagnosticMessage;
-        Infer_parameter_types_from_usage: DiagnosticMessage;
-        Convert_to_default_import: DiagnosticMessage;
-        Install_0: DiagnosticMessage;
-        Replace_import_with_0: DiagnosticMessage;
-        Use_synthetic_default_member: DiagnosticMessage;
-        Convert_to_ES6_module: DiagnosticMessage;
-        Add_undefined_type_to_property_0: DiagnosticMessage;
-        Add_initializer_to_property_0: DiagnosticMessage;
-        Add_definite_assignment_assertion_to_property_0: DiagnosticMessage;
-        Add_all_missing_members: DiagnosticMessage;
-        Infer_all_types_from_usage: DiagnosticMessage;
-        Delete_all_unused_declarations: DiagnosticMessage;
-        Prefix_all_unused_declarations_with_where_possible: DiagnosticMessage;
-        Fix_all_detected_spelling_errors: DiagnosticMessage;
-        Add_initializers_to_all_uninitialized_properties: DiagnosticMessage;
-        Add_definite_assignment_assertions_to_all_uninitialized_properties: DiagnosticMessage;
-        Add_undefined_type_to_all_uninitialized_properties: DiagnosticMessage;
-        Change_all_jsdoc_style_types_to_TypeScript: DiagnosticMessage;
-        Change_all_jsdoc_style_types_to_TypeScript_and_add_undefined_to_nullable_types: DiagnosticMessage;
-        Implement_all_unimplemented_interfaces: DiagnosticMessage;
-        Install_all_missing_types_packages: DiagnosticMessage;
-        Rewrite_all_as_indexed_access_types: DiagnosticMessage;
-        Convert_all_to_default_imports: DiagnosticMessage;
-        Make_all_super_calls_the_first_statement_in_their_constructor: DiagnosticMessage;
-        Add_qualifier_to_all_unresolved_variables_matching_a_member_name: DiagnosticMessage;
-        Change_all_extended_interfaces_to_implements: DiagnosticMessage;
-        Add_all_missing_super_calls: DiagnosticMessage;
-        Implement_all_inherited_abstract_classes: DiagnosticMessage;
-        Add_all_missing_async_modifiers: DiagnosticMessage;
-        Add_ts_ignore_to_all_error_messages: DiagnosticMessage;
-        Annotate_everything_with_types_from_JSDoc: DiagnosticMessage;
-        Add_to_all_uncalled_decorators: DiagnosticMessage;
-        Convert_all_constructor_functions_to_classes: DiagnosticMessage;
-        Generate_get_and_set_accessors: DiagnosticMessage;
-        Convert_require_to_import: DiagnosticMessage;
-        Convert_all_require_to_import: DiagnosticMessage;
-        Move_to_a_new_file: DiagnosticMessage;
-        Remove_unreachable_code: DiagnosticMessage;
-        Remove_all_unreachable_code: DiagnosticMessage;
-        Add_missing_typeof: DiagnosticMessage;
-        Remove_unused_label: DiagnosticMessage;
-        Remove_all_unused_labels: DiagnosticMessage;
-        Convert_0_to_mapped_object_type: DiagnosticMessage;
-        Convert_namespace_import_to_named_imports: DiagnosticMessage;
-        Convert_named_imports_to_namespace_import: DiagnosticMessage;
-    };
-}
-declare namespace ts {
-    type ErrorCallback = (message: DiagnosticMessage, length: number) => void;
-    function tokenIsIdentifierOrKeyword(token: SyntaxKind): boolean;
-    function tokenIsIdentifierOrKeywordOrGreaterThan(token: SyntaxKind): boolean;
-    interface Scanner {
-        getStartPos(): number;
-        getToken(): SyntaxKind;
-        getTextPos(): number;
-        getTokenPos(): number;
-        getTokenText(): string;
-        getTokenValue(): string;
-        hasExtendedUnicodeEscape(): boolean;
-        hasPrecedingLineBreak(): boolean;
-        isIdentifier(): boolean;
-        isReservedWord(): boolean;
-        isUnterminated(): boolean;
-        getTokenFlags(): TokenFlags;
-        reScanGreaterToken(): SyntaxKind;
-        reScanSlashToken(): SyntaxKind;
-        reScanTemplateToken(): SyntaxKind;
-        scanJsxIdentifier(): SyntaxKind;
-        scanJsxAttributeValue(): SyntaxKind;
-        reScanJsxToken(): JsxTokenSyntaxKind;
-        scanJsxToken(): JsxTokenSyntaxKind;
-        scanJSDocToken(): JsDocSyntaxKind;
-        scan(): SyntaxKind;
-        getText(): string;
-        setText(text: string | undefined, start?: number, length?: number): void;
-        setOnError(onError: ErrorCallback | undefined): void;
-        setScriptTarget(scriptTarget: ScriptTarget): void;
-        setLanguageVariant(variant: LanguageVariant): void;
-        setTextPos(textPos: number): void;
-        lookAhead<T>(callback: () => T): T;
-        scanRange<T>(start: number, length: number, callback: () => T): T;
-        tryScan<T>(callback: () => T): T;
-    }
-    function isUnicodeIdentifierStart(code: number, languageVersion: ScriptTarget | undefined): boolean;
-    function tokenToString(t: SyntaxKind): string | undefined;
-    function stringToToken(s: string): SyntaxKind | undefined;
-    function computeLineStarts(text: string): number[];
-    function getPositionOfLineAndCharacter(sourceFile: SourceFileLike, line: number, character: number): number;
-    function computePositionOfLineAndCharacter(lineStarts: ReadonlyArray<number>, line: number, character: number, debugText?: string): number;
-    function getLineStarts(sourceFile: SourceFileLike): ReadonlyArray<number>;
-    /**
-     * We assume the first line starts at position 0 and 'position' is non-negative.
-     */
-    function computeLineAndCharacterOfPosition(lineStarts: ReadonlyArray<number>, position: number): LineAndCharacter;
-    function getLineAndCharacterOfPosition(sourceFile: SourceFileLike, position: number): LineAndCharacter;
-    function isWhiteSpaceLike(ch: number): boolean;
-    /** Does not include line breaks. For that, see isWhiteSpaceLike. */
-    function isWhiteSpaceSingleLine(ch: number): boolean;
-    function isLineBreak(ch: number): boolean;
-    function isOctalDigit(ch: number): boolean;
-    function couldStartTrivia(text: string, pos: number): boolean;
-    function skipTrivia(text: string, pos: number, stopAfterLineBreak?: boolean, stopAtComments?: boolean): number;
-    function forEachLeadingCommentRange<U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean) => U): U | undefined;
-    function forEachLeadingCommentRange<T, U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean, state: T) => U, state: T): U | undefined;
-    function forEachTrailingCommentRange<U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean) => U): U | undefined;
-    function forEachTrailingCommentRange<T, U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean, state: T) => U, state: T): U | undefined;
-    function reduceEachLeadingCommentRange<T, U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean, state: T, memo: U) => U, state: T, initial: U): U | undefined;
-    function reduceEachTrailingCommentRange<T, U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean, state: T, memo: U) => U, state: T, initial: U): U | undefined;
-    function getLeadingCommentRanges(text: string, pos: number): CommentRange[] | undefined;
-    function getTrailingCommentRanges(text: string, pos: number): CommentRange[] | undefined;
-    /** Optionally, get the shebang */
-    function getShebang(text: string): string | undefined;
-    function isIdentifierStart(ch: number, languageVersion: ScriptTarget | undefined): boolean;
-    function isIdentifierPart(ch: number, languageVersion: ScriptTarget | undefined): boolean;
-    function isIdentifierText(name: string, languageVersion: ScriptTarget | undefined): boolean;
-    function createScanner(languageVersion: ScriptTarget, skipTrivia: boolean, languageVariant?: LanguageVariant, textInitial?: string, onError?: ErrorCallback, start?: number, length?: number): Scanner;
-}
-/** Non-internal stuff goes here */
-declare namespace ts {
-    const emptyArray: never[];
-    function closeFileWatcher(watcher: FileWatcher): void;
-    function isExternalModuleNameRelative(moduleName: string): boolean;
-    function sortAndDeduplicateDiagnostics<T extends Diagnostic>(diagnostics: ReadonlyArray<T>): T[];
-    function toPath(fileName: string, basePath: string | undefined, getCanonicalFileName: (path: string) => string): Path;
-    function hasEntries(map: ReadonlyUnderscoreEscapedMap<any> | undefined): map is ReadonlyUnderscoreEscapedMap<any>;
-}
-declare namespace ts {
-    const resolvingEmptyArray: never[];
-    const emptyMap: ReadonlyMap<never>;
-    const emptyUnderscoreEscapedMap: ReadonlyUnderscoreEscapedMap<never>;
-    const externalHelpersModuleNameText = "tslib";
-    function getDeclarationOfKind<T extends Declaration>(symbol: Symbol, kind: T["kind"]): T | undefined;
-    /** Create a new escaped identifier map. */
-    function createUnderscoreEscapedMap<T>(): UnderscoreEscapedMap<T>;
-    function createSymbolTable(symbols?: ReadonlyArray<Symbol>): SymbolTable;
-    function changesAffectModuleResolution(oldOptions: CompilerOptions, newOptions: CompilerOptions): boolean;
-    /**
-     * Iterates through the parent chain of a node and performs the callback on each parent until the callback
-     * returns a truthy value, then returns that value.
-     * If no such value is found, it applies the callback until the parent pointer is undefined or the callback returns "quit"
-     * At that point findAncestor returns undefined.
-     */
-    function findAncestor<T extends Node>(node: Node | undefined, callback: (element: Node) => element is T): T | undefined;
-    function findAncestor(node: Node | undefined, callback: (element: Node) => boolean | "quit"): Node | undefined;
-    /**
-     * Calls `callback` for each entry in the map, returning the first truthy result.
-     * Use `map.forEach` instead for normal iteration.
-     */
-    function forEachEntry<T, U>(map: ReadonlyUnderscoreEscapedMap<T>, callback: (value: T, key: __String) => U | undefined): U | undefined;
-    function forEachEntry<T, U>(map: ReadonlyMap<T>, callback: (value: T, key: string) => U | undefined): U | undefined;
-    /** `forEachEntry` for just keys. */
-    function forEachKey<T>(map: ReadonlyUnderscoreEscapedMap<{}>, callback: (key: __String) => T | undefined): T | undefined;
-    function forEachKey<T>(map: ReadonlyMap<{}>, callback: (key: string) => T | undefined): T | undefined;
-    /** Copy entries from `source` to `target`. */
-    function copyEntries<T>(source: ReadonlyUnderscoreEscapedMap<T>, target: UnderscoreEscapedMap<T>): void;
-    function copyEntries<T>(source: ReadonlyMap<T>, target: Map<T>): void;
-    /**
-     * Creates a set from the elements of an array.
-     *
-     * @param array the array of input elements.
-     */
-    function arrayToSet(array: ReadonlyArray<string>): Map<true>;
-    function arrayToSet<T>(array: ReadonlyArray<T>, makeKey: (value: T) => string | undefined): Map<true>;
-    function arrayToSet<T>(array: ReadonlyArray<T>, makeKey: (value: T) => __String | undefined): UnderscoreEscapedMap<true>;
-    function cloneMap(map: SymbolTable): SymbolTable;
-    function cloneMap<T>(map: ReadonlyMap<T>): Map<T>;
-    function cloneMap<T>(map: ReadonlyUnderscoreEscapedMap<T>): UnderscoreEscapedMap<T>;
-    function usingSingleLineStringWriter(action: (writer: EmitTextWriter) => void): string;
-    function getFullWidth(node: Node): number;
-    function getResolvedModule(sourceFile: SourceFile, moduleNameText: string): ResolvedModuleFull | undefined;
-    function setResolvedModule(sourceFile: SourceFile, moduleNameText: string, resolvedModule: ResolvedModuleFull): void;
-    function setResolvedTypeReferenceDirective(sourceFile: SourceFile, typeReferenceDirectiveName: string, resolvedTypeReferenceDirective: ResolvedTypeReferenceDirective): void;
-    function moduleResolutionIsEqualTo(oldResolution: ResolvedModuleFull, newResolution: ResolvedModuleFull): boolean;
-    function packageIdToString({ name, subModuleName, version }: PackageId): string;
-    function typeDirectiveIsEqualTo(oldResolution: ResolvedTypeReferenceDirective, newResolution: ResolvedTypeReferenceDirective): boolean;
-    function hasChangesInResolutions<T>(names: ReadonlyArray<string>, newResolutions: ReadonlyArray<T>, oldResolutions: ReadonlyMap<T> | undefined, comparer: (oldResolution: T, newResolution: T) => boolean): boolean;
-    function containsParseError(node: Node): boolean;
-    function getSourceFileOfNode(node: Node): SourceFile;
-    function getSourceFileOfNode(node: Node | undefined): SourceFile | undefined;
-    function isStatementWithLocals(node: Node): boolean;
-    function getStartPositionOfLine(line: number, sourceFile: SourceFileLike): number;
-    function nodePosToString(node: Node): string;
-    function getEndLinePosition(line: number, sourceFile: SourceFileLike): number;
-    /**
-     * Returns a value indicating whether a name is unique globally or within the current file.
-     * Note: This does not consider whether a name appears as a free identifier or not, so at the expression `x.y` this includes both `x` and `y`.
-     */
-    function isFileLevelUniqueName(sourceFile: SourceFile, name: string, hasGlobalName?: PrintHandlers["hasGlobalName"]): boolean;
-    function nodeIsMissing(node: Node | undefined): boolean;
-    function nodeIsPresent(node: Node | undefined): boolean;
-    /**
-     * Appends a range of value to begin of an array, returning the array.
-     *
-     * @param to The array to which `value` is to be appended. If `to` is `undefined`, a new array
-     * is created if `value` was appended.
-     * @param from The values to append to the array. If `from` is `undefined`, nothing is
-     * appended. If an element of `from` is `undefined`, that element is not appended.
-     */
-    function prependStatements<T extends Statement>(to: T[], from: ReadonlyArray<T> | undefined): T[] | undefined;
-    /**
-     * Determine if the given comment is a triple-slash
-     *
-     * @return true if the comment is a triple-slash comment else false
-     */
-    function isRecognizedTripleSlashComment(text: string, commentPos: number, commentEnd: number): boolean;
-    function isPinnedComment(text: string, start: number): boolean;
-    function getTokenPosOfNode(node: Node, sourceFile?: SourceFileLike, includeJsDoc?: boolean): number;
-    function getNonDecoratorTokenPosOfNode(node: Node, sourceFile?: SourceFileLike): number;
-    function getSourceTextOfNodeFromSourceFile(sourceFile: SourceFile, node: Node, includeTrivia?: boolean): string;
-    function getTextOfNodeFromSourceText(sourceText: string, node: Node, includeTrivia?: boolean): string;
-    function getTextOfNode(node: Node, includeTrivia?: boolean): string;
-    /**
-     * Note: it is expected that the `nodeArray` and the `node` are within the same file.
-     * For example, searching for a `SourceFile` in a `SourceFile[]` wouldn't work.
-     */
-    function indexOfNode(nodeArray: ReadonlyArray<Node>, node: Node): number;
-    /**
-     * Gets flags that control emit behavior of a node.
-     */
-    function getEmitFlags(node: Node): EmitFlags;
-    function getLiteralText(node: LiteralLikeNode, sourceFile: SourceFile): string;
-    function getTextOfConstantValue(value: string | number): string;
-    function escapeLeadingUnderscores(identifier: string): __String;
-    /**
-     * @deprecated Use `id.escapedText` to get the escaped text of an Identifier.
-     * @param identifier The identifier to escape
-     */
-    function escapeIdentifier(identifier: string): string;
-    function makeIdentifierFromModuleName(moduleName: string): string;
-    function isBlockOrCatchScoped(declaration: Declaration): boolean;
-    function isCatchClauseVariableDeclarationOrBindingElement(declaration: Declaration): boolean;
-    function isAmbientModule(node: Node): node is AmbientModuleDeclaration;
-    function isModuleWithStringLiteralName(node: Node): node is ModuleDeclaration;
-    function isNonGlobalAmbientModule(node: Node): node is ModuleDeclaration & {
-        name: StringLiteral;
-    };
-    /**
-     * An effective module (namespace) declaration is either
-     * 1. An actual declaration: namespace X { ... }
-     * 2. A Javascript declaration, which is:
-     *    An identifier in a nested property access expression: Y in `X.Y.Z = { ... }`
-     */
-    function isEffectiveModuleDeclaration(node: Node): boolean;
-    /** Given a symbol for a module, checks that it is a shorthand ambient module. */
-    function isShorthandAmbientModuleSymbol(moduleSymbol: Symbol): boolean;
-    function isBlockScopedContainerTopLevel(node: Node): boolean;
-    function isGlobalScopeAugmentation(module: ModuleDeclaration): boolean;
-    function isExternalModuleAugmentation(node: Node): node is AmbientModuleDeclaration;
-    function isModuleAugmentationExternal(node: AmbientModuleDeclaration): boolean;
-    function isEffectiveExternalModule(node: SourceFile, compilerOptions: CompilerOptions): boolean;
-    function isBlockScope(node: Node, parentNode: Node): boolean;
-    function isDeclarationWithTypeParameters(node: Node): node is DeclarationWithTypeParameters;
-    function isAnyImportSyntax(node: Node): node is AnyImportSyntax;
-    function isLateVisibilityPaintedStatement(node: Node): node is LateVisibilityPaintedStatement;
-    function isAnyImportOrReExport(node: Node): node is AnyImportOrReExport;
-    function getEnclosingBlockScopeContainer(node: Node): Node;
-    function declarationNameToString(name: DeclarationName | QualifiedName): string;
-    function getNameFromIndexInfo(info: IndexInfo): string | undefined;
-    function getTextOfPropertyName(name: PropertyName): __String;
-    function entityNameToString(name: EntityNameOrEntityNameExpression): string;
-    function createDiagnosticForNode(node: Node, message: DiagnosticMessage, arg0?: string | number, arg1?: string | number, arg2?: string | number, arg3?: string | number): DiagnosticWithLocation;
-    function createDiagnosticForNodeArray(sourceFile: SourceFile, nodes: NodeArray<Node>, message: DiagnosticMessage, arg0?: string | number, arg1?: string | number, arg2?: string | number, arg3?: string | number): Diagnostic;
-    function createDiagnosticForNodeInSourceFile(sourceFile: SourceFile, node: Node, message: DiagnosticMessage, arg0?: string | number, arg1?: string | number, arg2?: string | number, arg3?: string | number): DiagnosticWithLocation;
-    function createDiagnosticForNodeFromMessageChain(node: Node, messageChain: DiagnosticMessageChain): DiagnosticWithLocation;
-    function getSpanOfTokenAtPosition(sourceFile: SourceFile, pos: number): TextSpan;
-    function getErrorSpanForNode(sourceFile: SourceFile, node: Node): TextSpan;
-    function isExternalOrCommonJsModule(file: SourceFile): boolean;
-    function isJsonSourceFile(file: SourceFile): file is JsonSourceFile;
-    function isConstEnumDeclaration(node: Node): boolean;
-    function isConst(node: Node): boolean;
-    function isLet(node: Node): boolean;
-    function isSuperCall(n: Node): n is SuperCall;
-    function isImportCall(n: Node): n is ImportCall;
-    function isLiteralImportTypeNode(n: Node): n is LiteralImportTypeNode;
-    function isPrologueDirective(node: Node): node is PrologueDirective;
-    function getLeadingCommentRangesOfNode(node: Node, sourceFileOfNode: SourceFile): CommentRange[] | undefined;
-    function getJSDocCommentRanges(node: Node, text: string): CommentRange[] | undefined;
-    const fullTripleSlashReferencePathRegEx: RegExp;
-    const fullTripleSlashAMDReferencePathRegEx: RegExp;
-    function isPartOfTypeNode(node: Node): boolean;
-    function isChildOfNodeWithKind(node: Node, kind: SyntaxKind): boolean;
-    function forEachReturnStatement<T>(body: Block, visitor: (stmt: ReturnStatement) => T): T | undefined;
-    function forEachYieldExpression(body: Block, visitor: (expr: YieldExpression) => void): void;
-    /**
-     * Gets the most likely element type for a TypeNode. This is not an exhaustive test
-     * as it assumes a rest argument can only be an array type (either T[], or Array<T>).
-     *
-     * @param node The type node.
-     */
-    function getRestParameterElementType(node: TypeNode | undefined): TypeNode | undefined;
-    function getMembersOfDeclaration(node: Declaration): NodeArray<ClassElement | TypeElement | ObjectLiteralElement> | undefined;
-    function isVariableLike(node: Node): node is VariableLikeDeclaration;
-    function isVariableLikeOrAccessor(node: Node): node is AccessorDeclaration | VariableLikeDeclaration;
-    function isVariableDeclarationInVariableStatement(node: VariableDeclaration): boolean;
-    function isValidESSymbolDeclaration(node: Node): node is VariableDeclaration | PropertyDeclaration | SignatureDeclaration;
-    function introducesArgumentsExoticObject(node: Node): boolean;
-    function unwrapInnermostStatementOfLabel(node: LabeledStatement, beforeUnwrapLabelCallback?: (node: LabeledStatement) => void): Statement;
-    function isFunctionBlock(node: Node): boolean;
-    function isObjectLiteralMethod(node: Node): node is MethodDeclaration;
-    function isObjectLiteralOrClassExpressionMethod(node: Node): node is MethodDeclaration;
-    function isIdentifierTypePredicate(predicate: TypePredicate): predicate is IdentifierTypePredicate;
-    function isThisTypePredicate(predicate: TypePredicate): predicate is ThisTypePredicate;
-    function getPropertyAssignment(objectLiteral: ObjectLiteralExpression, key: string, key2?: string): ReadonlyArray<PropertyAssignment>;
-    function getTsConfigObjectLiteralExpression(tsConfigSourceFile: TsConfigSourceFile | undefined): ObjectLiteralExpression | undefined;
-    function getTsConfigPropArrayElementValue(tsConfigSourceFile: TsConfigSourceFile | undefined, propKey: string, elementValue: string): StringLiteral | undefined;
-    function getTsConfigPropArray(tsConfigSourceFile: TsConfigSourceFile | undefined, propKey: string): ReadonlyArray<PropertyAssignment>;
-    function getContainingFunction(node: Node): SignatureDeclaration | undefined;
-    function getContainingClass(node: Node): ClassLikeDeclaration | undefined;
-    function getThisContainer(node: Node, includeArrowFunctions: boolean): Node;
-    function getNewTargetContainer(node: Node): Node | undefined;
-    /**
-     * Given an super call/property node, returns the closest node where
-     * - a super call/property access is legal in the node and not legal in the parent node the node.
-     *   i.e. super call is legal in constructor but not legal in the class body.
-     * - the container is an arrow function (so caller might need to call getSuperContainer again in case it needs to climb higher)
-     * - a super call/property is definitely illegal in the container (but might be legal in some subnode)
-     *   i.e. super property access is illegal in function declaration but can be legal in the statement list
-     */
-    function getSuperContainer(node: Node, stopOnFunctions: boolean): Node;
-    function getImmediatelyInvokedFunctionExpression(func: Node): CallExpression | undefined;
-    /**
-     * Determines whether a node is a property or element access expression for `super`.
-     */
-    function isSuperProperty(node: Node): node is SuperProperty;
-    /**
-     * Determines whether a node is a property or element access expression for `this`.
-     */
-    function isThisProperty(node: Node): boolean;
-    function getEntityNameFromTypeNode(node: TypeNode): EntityNameOrEntityNameExpression | undefined;
-    function getInvokedExpression(node: CallLikeExpression): Expression;
-    function nodeCanBeDecorated(node: ClassDeclaration): true;
-    function nodeCanBeDecorated(node: ClassElement, parent: Node): boolean;
-    function nodeCanBeDecorated(node: Node, parent: Node, grandparent: Node): boolean;
-    function nodeIsDecorated(node: ClassDeclaration): boolean;
-    function nodeIsDecorated(node: ClassElement, parent: Node): boolean;
-    function nodeIsDecorated(node: Node, parent: Node, grandparent: Node): boolean;
-    function nodeOrChildIsDecorated(node: ClassDeclaration): boolean;
-    function nodeOrChildIsDecorated(node: ClassElement, parent: Node): boolean;
-    function nodeOrChildIsDecorated(node: Node, parent: Node, grandparent: Node): boolean;
-    function childIsDecorated(node: ClassDeclaration): boolean;
-    function childIsDecorated(node: Node, parent: Node): boolean;
-    function isJSXTagName(node: Node): boolean;
-    function isExpressionNode(node: Node): boolean;
-    function isInExpressionContext(node: Node): boolean;
-    function isExternalModuleImportEqualsDeclaration(node: Node): boolean;
-    function getExternalModuleImportEqualsDeclarationExpression(node: Node): Expression;
-    function isInternalModuleImportEqualsDeclaration(node: Node): node is ImportEqualsDeclaration;
-    function isSourceFileJavaScript(file: SourceFile): boolean;
-    function isSourceFileNotJavaScript(file: SourceFile): boolean;
-    function isInJavaScriptFile(node: Node | undefined): boolean;
-    function isInJsonFile(node: Node | undefined): boolean;
-    function isInJSDoc(node: Node | undefined): boolean;
-    function isJSDocIndexSignature(node: TypeReferenceNode | ExpressionWithTypeArguments): boolean | undefined;
-    /**
-     * Returns true if the node is a CallExpression to the identifier 'require' with
-     * exactly one argument (of the form 'require("name")').
-     * This function does not test if the node is in a JavaScript file or not.
-     */
-    function isRequireCall(callExpression: Node, checkArgumentIsStringLiteralLike: true): callExpression is RequireOrImportCall & {
-        expression: Identifier;
-        arguments: [StringLiteralLike];
-    };
-    function isRequireCall(callExpression: Node, checkArgumentIsStringLiteralLike: boolean): callExpression is CallExpression;
-    function isSingleOrDoubleQuote(charCode: number): boolean;
-    function isStringDoubleQuoted(str: StringLiteralLike, sourceFile: SourceFile): boolean;
-    function getDeclarationOfJSInitializer(node: Node): Node | undefined;
-    /** Get the initializer, taking into account defaulted Javascript initializers */
-    function getEffectiveInitializer(node: HasExpressionInitializer): Expression | undefined;
-    /**
-     * Get the assignment 'initializer' -- the righthand side-- when the initializer is container-like (See getJavascriptInitializer).
-     * We treat the right hand side of assignments with container-like initalizers as declarations.
-     */
-    function getAssignedJavascriptInitializer(node: Node): Expression | undefined;
-    /**
-     * Recognized Javascript container-like initializers are:
-     * 1. (function() {})() -- IIFEs
-     * 2. function() { } -- Function expressions
-     * 3. class { } -- Class expressions
-     * 4. {} -- Empty object literals
-     * 5. { ... } -- Non-empty object literals, when used to initialize a prototype, like `C.prototype = { m() { } }`
-     *
-     * This function returns the provided initializer, or undefined if it is not valid.
-     */
-    function getJavascriptInitializer(initializer: Node, isPrototypeAssignment: boolean): Expression | undefined;
-    function isDefaultedJavascriptInitializer(node: BinaryExpression): boolean | undefined;
-    /** Given a Javascript initializer, return the outer name. That is, the lhs of the assignment or the declaration name. */
-    function getOuterNameOfJsInitializer(node: Declaration): DeclarationName | undefined;
-    function getRightMostAssignedExpression(node: Expression): Expression;
-    function isExportsIdentifier(node: Node): boolean;
-    function isModuleExportsPropertyAccessExpression(node: Node): boolean;
-    function getSpecialPropertyAssignmentKind(expr: BinaryExpression): SpecialPropertyAssignmentKind;
-    function getInitializerOfBinaryExpression(expr: BinaryExpression): Expression;
-    function isPrototypePropertyAssignment(node: Node): boolean;
-    function isSpecialPropertyDeclaration(expr: PropertyAccessExpression): boolean;
-    function importFromModuleSpecifier(node: StringLiteralLike): AnyValidImportOrReExport;
-    function tryGetImportFromModuleSpecifier(node: StringLiteralLike): AnyValidImportOrReExport | undefined;
-    function getExternalModuleName(node: AnyImportOrReExport | ImportTypeNode): Expression | undefined;
-    function getNamespaceDeclarationNode(node: ImportDeclaration | ImportEqualsDeclaration | ExportDeclaration): ImportEqualsDeclaration | NamespaceImport | undefined;
-    function isDefaultImport(node: ImportDeclaration | ImportEqualsDeclaration | ExportDeclaration): boolean;
-    function hasQuestionToken(node: Node): boolean;
-    function isJSDocConstructSignature(node: Node): boolean;
-    function isJSDocTypeAlias(node: Node): node is JSDocTypedefTag | JSDocCallbackTag;
-    function isTypeAlias(node: Node): node is JSDocTypedefTag | JSDocCallbackTag | TypeAliasDeclaration;
-    function getJSDocCommentsAndTags(hostNode: Node): ReadonlyArray<JSDoc | JSDocTag>;
-    /** Does the opposite of `getJSDocParameterTags`: given a JSDoc parameter, finds the parameter corresponding to it. */
-    function getParameterSymbolFromJSDoc(node: JSDocParameterTag): Symbol | undefined;
-    function getHostSignatureFromJSDoc(node: Node): SignatureDeclaration | undefined;
-    function getHostSignatureFromJSDocHost(host: HasJSDoc): SignatureDeclaration | undefined;
-    function getJSDocHost(node: Node): HasJSDoc;
-    function getTypeParameterFromJsDoc(node: TypeParameterDeclaration & {
-        parent: JSDocTemplateTag;
-    }): TypeParameterDeclaration | undefined;
-    function hasRestParameter(s: SignatureDeclaration | JSDocSignature): boolean;
-    function isRestParameter(node: ParameterDeclaration | JSDocParameterTag): boolean;
-    enum AssignmentKind {
-        None = 0,
-        Definite = 1,
-        Compound = 2
-    }
-    function getAssignmentTargetKind(node: Node): AssignmentKind;
-    function isAssignmentTarget(node: Node): boolean;
-    type NodeWithPossibleHoistedDeclaration = Block | VariableStatement | WithStatement | IfStatement | SwitchStatement | CaseBlock | CaseClause | DefaultClause | LabeledStatement | ForStatement | ForInStatement | ForOfStatement | DoStatement | WhileStatement | TryStatement | CatchClause;
-    /**
-     * Indicates whether a node could contain a `var` VariableDeclarationList that contributes to
-     * the same `var` declaration scope as the node's parent.
-     */
-    function isNodeWithPossibleHoistedDeclaration(node: Node): node is NodeWithPossibleHoistedDeclaration;
-    type ValueSignatureDeclaration = FunctionDeclaration | MethodDeclaration | ConstructorDeclaration | AccessorDeclaration | FunctionExpression | ArrowFunction;
-    function isValueSignatureDeclaration(node: Node): node is ValueSignatureDeclaration;
-    function walkUpParenthesizedTypes(node: Node): Node;
-    function walkUpParenthesizedExpressions(node: Node): Node;
-    function skipParentheses(node: Expression): Expression;
-    function skipParentheses(node: Node): Node;
-    function isDeleteTarget(node: Node): boolean;
-    function isNodeDescendantOf(node: Node, ancestor: Node): boolean;
-    function isDeclarationName(name: Node): boolean;
-    function isAnyDeclarationName(name: Node): boolean;
-    function isLiteralComputedPropertyDeclarationName(node: Node): boolean;
-    function isIdentifierName(node: Identifier): boolean;
-    function isAliasSymbolDeclaration(node: Node): boolean;
-    function exportAssignmentIsAlias(node: ExportAssignment | BinaryExpression): boolean;
-    function getClassExtendsHeritageClauseElement(node: ClassLikeDeclaration | InterfaceDeclaration): ExpressionWithTypeArguments | undefined;
-    function getClassImplementsHeritageClauseElements(node: ClassLikeDeclaration): NodeArray<ExpressionWithTypeArguments> | undefined;
-    /** Returns the node in an `extends` or `implements` clause of a class or interface. */
-    function getAllSuperTypeNodes(node: Node): ReadonlyArray<TypeNode>;
-    function getInterfaceBaseTypeNodes(node: InterfaceDeclaration): NodeArray<ExpressionWithTypeArguments> | undefined;
-    function getHeritageClause(clauses: NodeArray<HeritageClause> | undefined, kind: SyntaxKind): HeritageClause | undefined;
-    function tryResolveScriptReference(host: ScriptReferenceHost, sourceFile: SourceFile, reference: FileReference): SourceFile | undefined;
-    function getAncestor(node: Node | undefined, kind: SyntaxKind): Node | undefined;
-    function isKeyword(token: SyntaxKind): boolean;
-    function isContextualKeyword(token: SyntaxKind): boolean;
-    function isNonContextualKeyword(token: SyntaxKind): boolean;
-    function isStringANonContextualKeyword(name: string): boolean;
-    type TriviaKind = SyntaxKind.SingleLineCommentTrivia | SyntaxKind.MultiLineCommentTrivia | SyntaxKind.NewLineTrivia | SyntaxKind.WhitespaceTrivia | SyntaxKind.ShebangTrivia | SyntaxKind.ConflictMarkerTrivia;
-    function isTrivia(token: SyntaxKind): token is TriviaKind;
-    enum FunctionFlags {
-        Normal = 0,
-        Generator = 1,
-        Async = 2,
-        Invalid = 4,
-        AsyncGenerator = 3
-    }
-    function getFunctionFlags(node: SignatureDeclaration | undefined): FunctionFlags;
-    function isAsyncFunction(node: Node): boolean;
-    function isStringOrNumericLiteral(node: Node): node is StringLiteral | NumericLiteral;
-    /**
-     * A declaration has a dynamic name if both of the following are true:
-     *   1. The declaration has a computed property name
-     *   2. The computed name is *not* expressed as Symbol.<name>, where name
-     *      is a property of the Symbol constructor that denotes a built in
-     *      Symbol.
-     */
-    function hasDynamicName(declaration: Declaration): declaration is DynamicNamedDeclaration;
-    function isDynamicName(name: DeclarationName): boolean;
-    /**
-     * Checks if the expression is of the form:
-     *    Symbol.name
-     * where Symbol is literally the word "Symbol", and name is any identifierName
-     */
-    function isWellKnownSymbolSyntactically(node: Expression): boolean;
-    function getPropertyNameForPropertyNameNode(name: DeclarationName): __String | undefined;
-    type PropertyNameLiteral = Identifier | StringLiteralLike | NumericLiteral;
-    function isPropertyNameLiteral(node: Node): node is PropertyNameLiteral;
-    function getTextOfIdentifierOrLiteral(node: PropertyNameLiteral): string;
-    function getEscapedTextOfIdentifierOrLiteral(node: PropertyNameLiteral): __String;
-    function getPropertyNameForKnownSymbolName(symbolName: string): __String;
-    function isKnownSymbol(symbol: Symbol): boolean;
-    /**
-     * Includes the word "Symbol" with unicode escapes
-     */
-    function isESSymbolIdentifier(node: Node): boolean;
-    function isPushOrUnshiftIdentifier(node: Identifier): boolean;
-    function isParameterDeclaration(node: VariableLikeDeclaration): boolean;
-    function getRootDeclaration(node: Node): Node;
-    function nodeStartsNewLexicalEnvironment(node: Node): boolean;
-    function nodeIsSynthesized(range: TextRange): boolean;
-    function getOriginalSourceFile(sourceFile: SourceFile): SourceFile;
-    enum Associativity {
-        Left = 0,
-        Right = 1
-    }
-    function getExpressionAssociativity(expression: Expression): Associativity;
-    function getOperatorAssociativity(kind: SyntaxKind, operator: SyntaxKind, hasArguments?: boolean): Associativity;
-    function getExpressionPrecedence(expression: Expression): number;
-    function getOperator(expression: Expression): SyntaxKind.Unknown | SyntaxKind.EndOfFileToken | SyntaxKind.SingleLineCommentTrivia | SyntaxKind.MultiLineCommentTrivia | SyntaxKind.NewLineTrivia | SyntaxKind.WhitespaceTrivia | SyntaxKind.ShebangTrivia | SyntaxKind.ConflictMarkerTrivia | SyntaxKind.NumericLiteral | SyntaxKind.StringLiteral | SyntaxKind.JsxText | SyntaxKind.JsxTextAllWhiteSpaces | SyntaxKind.RegularExpressionLiteral | SyntaxKind.NoSubstitutionTemplateLiteral | SyntaxKind.TemplateHead | SyntaxKind.TemplateMiddle | SyntaxKind.TemplateTail | SyntaxKind.OpenBraceToken | SyntaxKind.CloseBraceToken | SyntaxKind.OpenParenToken | SyntaxKind.CloseParenToken | SyntaxKind.OpenBracketToken | SyntaxKind.CloseBracketToken | SyntaxKind.DotToken | SyntaxKind.DotDotDotToken | SyntaxKind.SemicolonToken | SyntaxKind.CommaToken | SyntaxKind.LessThanToken | SyntaxKind.LessThanSlashToken | SyntaxKind.GreaterThanToken | SyntaxKind.LessThanEqualsToken | SyntaxKind.GreaterThanEqualsToken | SyntaxKind.EqualsEqualsToken | SyntaxKind.ExclamationEqualsToken | SyntaxKind.EqualsEqualsEqualsToken | SyntaxKind.ExclamationEqualsEqualsToken | SyntaxKind.EqualsGreaterThanToken | SyntaxKind.PlusToken | SyntaxKind.MinusToken | SyntaxKind.AsteriskToken | SyntaxKind.AsteriskAsteriskToken | SyntaxKind.SlashToken | SyntaxKind.PercentToken | SyntaxKind.PlusPlusToken | SyntaxKind.MinusMinusToken | SyntaxKind.LessThanLessThanToken | SyntaxKind.GreaterThanGreaterThanToken | SyntaxKind.GreaterThanGreaterThanGreaterThanToken | SyntaxKind.AmpersandToken | SyntaxKind.BarToken | SyntaxKind.CaretToken | SyntaxKind.ExclamationToken | SyntaxKind.TildeToken | SyntaxKind.AmpersandAmpersandToken | SyntaxKind.BarBarToken | SyntaxKind.QuestionToken | SyntaxKind.ColonToken | SyntaxKind.AtToken | SyntaxKind.EqualsToken | SyntaxKind.PlusEqualsToken | SyntaxKind.MinusEqualsToken | SyntaxKind.AsteriskEqualsToken | SyntaxKind.AsteriskAsteriskEqualsToken | SyntaxKind.SlashEqualsToken | SyntaxKind.PercentEqualsToken | SyntaxKind.LessThanLessThanEqualsToken | SyntaxKind.GreaterThanGreaterThanEqualsToken | SyntaxKind.GreaterThanGreaterThanGreaterThanEqualsToken | SyntaxKind.AmpersandEqualsToken | SyntaxKind.BarEqualsToken | SyntaxKind.CaretEqualsToken | SyntaxKind.Identifier | SyntaxKind.BreakKeyword | SyntaxKind.CaseKeyword | SyntaxKind.CatchKeyword | SyntaxKind.ClassKeyword | SyntaxKind.ConstKeyword | SyntaxKind.ContinueKeyword | SyntaxKind.DebuggerKeyword | SyntaxKind.DefaultKeyword | SyntaxKind.DeleteKeyword | SyntaxKind.DoKeyword | SyntaxKind.ElseKeyword | SyntaxKind.EnumKeyword | SyntaxKind.ExportKeyword | SyntaxKind.ExtendsKeyword | SyntaxKind.FalseKeyword | SyntaxKind.FinallyKeyword | SyntaxKind.ForKeyword | SyntaxKind.FunctionKeyword | SyntaxKind.IfKeyword | SyntaxKind.ImportKeyword | SyntaxKind.InKeyword | SyntaxKind.InstanceOfKeyword | SyntaxKind.NewKeyword | SyntaxKind.NullKeyword | SyntaxKind.ReturnKeyword | SyntaxKind.SuperKeyword | SyntaxKind.SwitchKeyword | SyntaxKind.ThisKeyword | SyntaxKind.ThrowKeyword | SyntaxKind.TrueKeyword | SyntaxKind.TryKeyword | SyntaxKind.TypeOfKeyword | SyntaxKind.VarKeyword | SyntaxKind.VoidKeyword | SyntaxKind.WhileKeyword | SyntaxKind.WithKeyword | SyntaxKind.ImplementsKeyword | SyntaxKind.InterfaceKeyword | SyntaxKind.LetKeyword | SyntaxKind.PackageKeyword | SyntaxKind.PrivateKeyword | SyntaxKind.ProtectedKeyword | SyntaxKind.PublicKeyword | SyntaxKind.StaticKeyword | SyntaxKind.YieldKeyword | SyntaxKind.AbstractKeyword | SyntaxKind.AsKeyword | SyntaxKind.AnyKeyword | SyntaxKind.AsyncKeyword | SyntaxKind.AwaitKeyword | SyntaxKind.BooleanKeyword | SyntaxKind.ConstructorKeyword | SyntaxKind.DeclareKeyword | SyntaxKind.GetKeyword | SyntaxKind.InferKeyword | SyntaxKind.IsKeyword | SyntaxKind.KeyOfKeyword | SyntaxKind.ModuleKeyword | SyntaxKind.NamespaceKeyword | SyntaxKind.NeverKeyword | SyntaxKind.ReadonlyKeyword | SyntaxKind.RequireKeyword | SyntaxKind.NumberKeyword | SyntaxKind.ObjectKeyword | SyntaxKind.SetKeyword | SyntaxKind.StringKeyword | SyntaxKind.SymbolKeyword | SyntaxKind.TypeKeyword | SyntaxKind.UndefinedKeyword | SyntaxKind.UniqueKeyword | SyntaxKind.UnknownKeyword | SyntaxKind.FromKeyword | SyntaxKind.GlobalKeyword | SyntaxKind.OfKeyword | SyntaxKind.QualifiedName | SyntaxKind.ComputedPropertyName | SyntaxKind.TypeParameter | SyntaxKind.Parameter | SyntaxKind.Decorator | SyntaxKind.PropertySignature | SyntaxKind.PropertyDeclaration | SyntaxKind.MethodSignature | SyntaxKind.MethodDeclaration | SyntaxKind.Constructor | SyntaxKind.GetAccessor | SyntaxKind.SetAccessor | SyntaxKind.CallSignature | SyntaxKind.ConstructSignature | SyntaxKind.IndexSignature | SyntaxKind.TypePredicate | SyntaxKind.TypeReference | SyntaxKind.FunctionType | SyntaxKind.ConstructorType | SyntaxKind.TypeQuery | SyntaxKind.TypeLiteral | SyntaxKind.ArrayType | SyntaxKind.TupleType | SyntaxKind.UnionType | SyntaxKind.IntersectionType | SyntaxKind.ConditionalType | SyntaxKind.InferType | SyntaxKind.ParenthesizedType | SyntaxKind.ThisType | SyntaxKind.TypeOperator | SyntaxKind.IndexedAccessType | SyntaxKind.MappedType | SyntaxKind.LiteralType | SyntaxKind.ImportType | SyntaxKind.ObjectBindingPattern | SyntaxKind.ArrayBindingPattern | SyntaxKind.BindingElement | SyntaxKind.ArrayLiteralExpression | SyntaxKind.ObjectLiteralExpression | SyntaxKind.PropertyAccessExpression | SyntaxKind.ElementAccessExpression | SyntaxKind.CallExpression | SyntaxKind.NewExpression | SyntaxKind.TaggedTemplateExpression | SyntaxKind.TypeAssertionExpression | SyntaxKind.ParenthesizedExpression | SyntaxKind.FunctionExpression | SyntaxKind.ArrowFunction | SyntaxKind.DeleteExpression | SyntaxKind.TypeOfExpression | SyntaxKind.VoidExpression | SyntaxKind.AwaitExpression | SyntaxKind.ConditionalExpression | SyntaxKind.TemplateExpression | SyntaxKind.YieldExpression | SyntaxKind.SpreadElement | SyntaxKind.ClassExpression | SyntaxKind.OmittedExpression | SyntaxKind.ExpressionWithTypeArguments | SyntaxKind.AsExpression | SyntaxKind.NonNullExpression | SyntaxKind.MetaProperty | SyntaxKind.TemplateSpan | SyntaxKind.SemicolonClassElement | SyntaxKind.Block | SyntaxKind.VariableStatement | SyntaxKind.EmptyStatement | SyntaxKind.ExpressionStatement | SyntaxKind.IfStatement | SyntaxKind.DoStatement | SyntaxKind.WhileStatement | SyntaxKind.ForStatement | SyntaxKind.ForInStatement | SyntaxKind.ForOfStatement | SyntaxKind.ContinueStatement | SyntaxKind.BreakStatement | SyntaxKind.ReturnStatement | SyntaxKind.WithStatement | SyntaxKind.SwitchStatement | SyntaxKind.LabeledStatement | SyntaxKind.ThrowStatement | SyntaxKind.TryStatement | SyntaxKind.DebuggerStatement | SyntaxKind.VariableDeclaration | SyntaxKind.VariableDeclarationList | SyntaxKind.FunctionDeclaration | SyntaxKind.ClassDeclaration | SyntaxKind.InterfaceDeclaration | SyntaxKind.TypeAliasDeclaration | SyntaxKind.EnumDeclaration | SyntaxKind.ModuleDeclaration | SyntaxKind.ModuleBlock | SyntaxKind.CaseBlock | SyntaxKind.NamespaceExportDeclaration | SyntaxKind.ImportEqualsDeclaration | SyntaxKind.ImportDeclaration | SyntaxKind.ImportClause | SyntaxKind.NamespaceImport | SyntaxKind.NamedImports | SyntaxKind.ImportSpecifier | SyntaxKind.ExportAssignment | SyntaxKind.ExportDeclaration | SyntaxKind.NamedExports | SyntaxKind.ExportSpecifier | SyntaxKind.MissingDeclaration | SyntaxKind.ExternalModuleReference | SyntaxKind.JsxElement | SyntaxKind.JsxSelfClosingElement | SyntaxKind.JsxOpeningElement | SyntaxKind.JsxClosingElement | SyntaxKind.JsxFragment | SyntaxKind.JsxOpeningFragment | SyntaxKind.JsxClosingFragment | SyntaxKind.JsxAttribute | SyntaxKind.JsxAttributes | SyntaxKind.JsxSpreadAttribute | SyntaxKind.JsxExpression | SyntaxKind.CaseClause | SyntaxKind.DefaultClause | SyntaxKind.HeritageClause | SyntaxKind.CatchClause | SyntaxKind.PropertyAssignment | SyntaxKind.ShorthandPropertyAssignment | SyntaxKind.SpreadAssignment | SyntaxKind.EnumMember | SyntaxKind.SourceFile | SyntaxKind.Bundle | SyntaxKind.UnparsedSource | SyntaxKind.InputFiles | SyntaxKind.JSDocTypeExpression | SyntaxKind.JSDocAllType | SyntaxKind.JSDocUnknownType | SyntaxKind.JSDocNullableType | SyntaxKind.JSDocNonNullableType | SyntaxKind.JSDocOptionalType | SyntaxKind.JSDocFunctionType | SyntaxKind.JSDocVariadicType | SyntaxKind.JSDocComment | SyntaxKind.JSDocTypeLiteral | SyntaxKind.JSDocSignature | SyntaxKind.JSDocTag | SyntaxKind.JSDocAugmentsTag | SyntaxKind.JSDocClassTag | SyntaxKind.JSDocCallbackTag | SyntaxKind.JSDocParameterTag | SyntaxKind.JSDocReturnTag | SyntaxKind.JSDocTypeTag | SyntaxKind.JSDocTemplateTag | SyntaxKind.JSDocTypedefTag | SyntaxKind.JSDocPropertyTag | SyntaxKind.SyntaxList | SyntaxKind.NotEmittedStatement | SyntaxKind.PartiallyEmittedExpression | SyntaxKind.CommaListExpression | SyntaxKind.MergeDeclarationMarker | SyntaxKind.EndOfDeclarationMarker | SyntaxKind.Count;
-    function getOperatorPrecedence(nodeKind: SyntaxKind, operatorKind: SyntaxKind, hasArguments?: boolean): number;
-    function getBinaryOperatorPrecedence(kind: SyntaxKind): number;
-    function createDiagnosticCollection(): DiagnosticCollection;
-    /**
-     * Based heavily on the abstract 'Quote'/'QuoteJSONString' operation from ECMA-262 (24.3.2.2),
-     * but augmented for a few select characters (e.g. lineSeparator, paragraphSeparator, nextLine)
-     * Note that this doesn't actually wrap the input in double quotes.
-     */
-    function escapeString(s: string, quoteChar?: CharacterCodes.doubleQuote | CharacterCodes.singleQuote | CharacterCodes.backtick): string;
-    function isIntrinsicJsxName(name: __String | string): boolean;
-    function escapeNonAsciiString(s: string, quoteChar?: CharacterCodes.doubleQuote | CharacterCodes.singleQuote | CharacterCodes.backtick): string;
-    function getIndentString(level: number): string;
-    function getIndentSize(): number;
-    function createTextWriter(newLine: string): EmitTextWriter;
-    function getResolvedExternalModuleName(host: EmitHost, file: SourceFile, referenceFile?: SourceFile): string;
-    function getExternalModuleNameFromDeclaration(host: EmitHost, resolver: EmitResolver, declaration: ImportEqualsDeclaration | ImportDeclaration | ExportDeclaration | ModuleDeclaration | ImportTypeNode): string | undefined;
-    /**
-     * Resolves a local path to a path which is absolute to the base of the emit
-     */
-    function getExternalModuleNameFromPath(host: EmitHost, fileName: string, referencePath?: string): string;
-    function getOwnEmitOutputFilePath(sourceFile: SourceFile, host: EmitHost, extension: string): string;
-    function getDeclarationEmitOutputFilePath(sourceFile: SourceFile, host: EmitHost): string;
-    interface EmitFileNames {
-        jsFilePath: string;
-        sourceMapFilePath: string | undefined;
-        declarationFilePath: string | undefined;
-        declarationMapPath: string | undefined;
-        bundleInfoPath: string | undefined;
-    }
-    /**
-     * Gets the source files that are expected to have an emit output.
-     *
-     * Originally part of `forEachExpectedEmitFile`, this functionality was extracted to support
-     * transformations.
-     *
-     * @param host An EmitHost.
-     * @param targetSourceFile An optional target source file to emit.
-     */
-    function getSourceFilesToEmit(host: EmitHost, targetSourceFile?: SourceFile): ReadonlyArray<SourceFile>;
-    /** Don't call this for `--outFile`, just for `--outDir` or plain emit. `--outFile` needs additional checks. */
-    function sourceFileMayBeEmitted(sourceFile: SourceFile, options: CompilerOptions, isSourceFileFromExternalLibrary: (file: SourceFile) => boolean): boolean;
-    function getSourceFilePathInNewDir(sourceFile: SourceFile, host: EmitHost, newDirPath: string): string;
-    function writeFile(host: EmitHost, diagnostics: DiagnosticCollection, fileName: string, data: string, writeByteOrderMark: boolean, sourceFiles?: ReadonlyArray<SourceFile>): void;
-    function getLineOfLocalPosition(currentSourceFile: SourceFile, pos: number): number;
-    function getLineOfLocalPositionFromLineMap(lineMap: ReadonlyArray<number>, pos: number): number;
-    function getFirstConstructorWithBody(node: ClassLikeDeclaration): ConstructorDeclaration | undefined;
-    /** Get the type annotation for the value parameter. */
-    function getSetAccessorTypeAnnotationNode(accessor: SetAccessorDeclaration): TypeNode | undefined;
-    function getThisParameter(signature: SignatureDeclaration | JSDocSignature): ParameterDeclaration | undefined;
-    function parameterIsThisKeyword(parameter: ParameterDeclaration): boolean;
-    function isThisIdentifier(node: Node | undefined): boolean;
-    function identifierIsThisKeyword(id: Identifier): boolean;
-    function getAllAccessorDeclarations(declarations: NodeArray<Declaration>, accessor: AccessorDeclaration): AllAccessorDeclarations;
-    /**
-     * Gets the effective type annotation of a variable, parameter, or property. If the node was
-     * parsed in a JavaScript file, gets the type annotation from JSDoc.
-     */
-    function getEffectiveTypeAnnotationNode(node: Node): TypeNode | undefined;
-    function getTypeAnnotationNode(node: Node): TypeNode | undefined;
-    /**
-     * Gets the effective return type annotation of a signature. If the node was parsed in a
-     * JavaScript file, gets the return type annotation from JSDoc.
-     */
-    function getEffectiveReturnTypeNode(node: SignatureDeclaration | JSDocSignature): TypeNode | undefined;
-    /**
-     * Gets the effective type parameters. If the node was parsed in a
-     * JavaScript file, gets the type parameters from the `@template` tag from JSDoc.
-     */
-    function getEffectiveTypeParameterDeclarations(node: DeclarationWithTypeParameters): ReadonlyArray<TypeParameterDeclaration>;
-    function getJSDocTypeParameterDeclarations(node: DeclarationWithTypeParameters): ReadonlyArray<TypeParameterDeclaration>;
-    /**
-     * Gets the effective type annotation of the value parameter of a set accessor. If the node
-     * was parsed in a JavaScript file, gets the type annotation from JSDoc.
-     */
-    function getEffectiveSetAccessorTypeAnnotationNode(node: SetAccessorDeclaration): TypeNode | undefined;
-    function emitNewLineBeforeLeadingComments(lineMap: ReadonlyArray<number>, writer: EmitTextWriter, node: TextRange, leadingComments: ReadonlyArray<CommentRange> | undefined): void;
-    function emitNewLineBeforeLeadingCommentsOfPosition(lineMap: ReadonlyArray<number>, writer: EmitTextWriter, pos: number, leadingComments: ReadonlyArray<CommentRange> | undefined): void;
-    function emitNewLineBeforeLeadingCommentOfPosition(lineMap: ReadonlyArray<number>, writer: EmitTextWriter, pos: number, commentPos: number): void;
-    function emitComments(text: string, lineMap: ReadonlyArray<number>, writer: EmitTextWriter, comments: ReadonlyArray<CommentRange> | undefined, leadingSeparator: boolean, trailingSeparator: boolean, newLine: string, writeComment: (text: string, lineMap: ReadonlyArray<number>, writer: EmitTextWriter, commentPos: number, commentEnd: number, newLine: string) => void): void;
-    /**
-     * Detached comment is a comment at the top of file or function body that is separated from
-     * the next statement by space.
-     */
-    function emitDetachedComments(text: string, lineMap: ReadonlyArray<number>, writer: EmitTextWriter, writeComment: (text: string, lineMap: ReadonlyArray<number>, writer: EmitTextWriter, commentPos: number, commentEnd: number, newLine: string) => void, node: TextRange, newLine: string, removeComments: boolean): {
-        nodePos: number;
-        detachedCommentEndPos: number;
-    } | undefined;
-    function writeCommentRange(text: string, lineMap: ReadonlyArray<number>, writer: EmitTextWriter, commentPos: number, commentEnd: number, newLine: string): void;
-    function hasModifiers(node: Node): boolean;
-    function hasModifier(node: Node, flags: ModifierFlags): boolean;
-    function hasStaticModifier(node: Node): boolean;
-    function hasReadonlyModifier(node: Node): boolean;
-    function getSelectedModifierFlags(node: Node, flags: ModifierFlags): ModifierFlags;
-    function getModifierFlags(node: Node): ModifierFlags;
-    function getModifierFlagsNoCache(node: Node): ModifierFlags;
-    function modifierToFlag(token: SyntaxKind): ModifierFlags;
-    function isLogicalOperator(token: SyntaxKind): boolean;
-    function isAssignmentOperator(token: SyntaxKind): boolean;
-    /** Get `C` given `N` if `N` is in the position `class C extends N` where `N` is an ExpressionWithTypeArguments. */
-    function tryGetClassExtendingExpressionWithTypeArguments(node: Node): ClassLikeDeclaration | undefined;
-    function isAssignmentExpression(node: Node, excludeCompoundAssignment: true): node is AssignmentExpression<EqualsToken>;
-    function isAssignmentExpression(node: Node, excludeCompoundAssignment?: false): node is AssignmentExpression<AssignmentOperatorToken>;
-    function isDestructuringAssignment(node: Node): node is DestructuringAssignment;
-    function isExpressionWithTypeArgumentsInClassExtendsClause(node: Node): boolean;
-    function isExpressionWithTypeArgumentsInClassImplementsClause(node: Node): node is ExpressionWithTypeArguments;
-    function isEntityNameExpression(node: Node): node is EntityNameExpression;
-    function isPropertyAccessEntityNameExpression(node: Node): node is PropertyAccessEntityNameExpression;
-    function isPrototypeAccess(node: Node): node is PropertyAccessExpression;
-    function isRightSideOfQualifiedNameOrPropertyAccess(node: Node): boolean;
-    function isEmptyObjectLiteral(expression: Node): boolean;
-    function isEmptyArrayLiteral(expression: Node): boolean;
-    function getLocalSymbolForExportDefault(symbol: Symbol): Symbol | undefined;
-    /** Return ".ts", ".d.ts", or ".tsx", if that is the extension. */
-    function tryExtractTypeScriptExtension(fileName: string): string | undefined;
-    /**
-     * Converts a string to a base-64 encoded ASCII string.
-     */
-    function convertToBase64(input: string): string;
-    function base64encode(host: {
-        base64encode?(input: string): string;
-    } | undefined, input: string): string;
-    function base64decode(host: {
-        base64decode?(input: string): string;
-    } | undefined, input: string): string;
-    function getNewLineCharacter(options: CompilerOptions | PrinterOptions, getNewLine?: () => string): string;
-    function formatSyntaxKind(kind: SyntaxKind | undefined): string;
-    function formatModifierFlags(flags: ModifierFlags | undefined): string;
-    function formatTransformFlags(flags: TransformFlags | undefined): string;
-    function formatEmitFlags(flags: EmitFlags | undefined): string;
-    function formatSymbolFlags(flags: SymbolFlags | undefined): string;
-    function formatTypeFlags(flags: TypeFlags | undefined): string;
-    function formatObjectFlags(flags: ObjectFlags | undefined): string;
-    /**
-     * Creates a new TextRange from the provided pos and end.
-     *
-     * @param pos The start position.
-     * @param end The end position.
-     */
-    function createRange(pos: number, end: number): TextRange;
-    /**
-     * Creates a new TextRange from a provided range with a new end position.
-     *
-     * @param range A TextRange.
-     * @param end The new end position.
-     */
-    function moveRangeEnd(range: TextRange, end: number): TextRange;
-    /**
-     * Creates a new TextRange from a provided range with a new start position.
-     *
-     * @param range A TextRange.
-     * @param pos The new Start position.
-     */
-    function moveRangePos(range: TextRange, pos: number): TextRange;
-    /**
-     * Moves the start position of a range past any decorators.
-     */
-    function moveRangePastDecorators(node: Node): TextRange;
-    /**
-     * Moves the start position of a range past any decorators or modifiers.
-     */
-    function moveRangePastModifiers(node: Node): TextRange;
-    /**
-     * Determines whether a TextRange has the same start and end positions.
-     *
-     * @param range A TextRange.
-     */
-    function isCollapsedRange(range: TextRange): boolean;
-    /**
-     * Creates a new TextRange for a token at the provides start position.
-     *
-     * @param pos The start position.
-     * @param token The token.
-     */
-    function createTokenRange(pos: number, token: SyntaxKind): TextRange;
-    function rangeIsOnSingleLine(range: TextRange, sourceFile: SourceFile): boolean;
-    function rangeStartPositionsAreOnSameLine(range1: TextRange, range2: TextRange, sourceFile: SourceFile): boolean;
-    function rangeEndPositionsAreOnSameLine(range1: TextRange, range2: TextRange, sourceFile: SourceFile): boolean;
-    function rangeStartIsOnSameLineAsRangeEnd(range1: TextRange, range2: TextRange, sourceFile: SourceFile): boolean;
-    function rangeEndIsOnSameLineAsRangeStart(range1: TextRange, range2: TextRange, sourceFile: SourceFile): boolean;
-    function positionsAreOnSameLine(pos1: number, pos2: number, sourceFile: SourceFile): boolean;
-    function getStartPositionOfRange(range: TextRange, sourceFile: SourceFile): number;
-    /**
-     * Determines whether a name was originally the declaration name of an enum or namespace
-     * declaration.
-     */
-    function isDeclarationNameOfEnumOrNamespace(node: Identifier): boolean;
-    function getInitializedVariables(node: VariableDeclarationList): ReadonlyArray<VariableDeclaration>;
-    function isWatchSet(options: CompilerOptions): boolean | undefined;
-    function getCheckFlags(symbol: Symbol): CheckFlags;
-    function getDeclarationModifierFlagsFromSymbol(s: Symbol): ModifierFlags;
-    function skipAlias(symbol: Symbol, checker: TypeChecker): Symbol;
-    /** See comment on `declareModuleMember` in `binder.ts`. */
-    function getCombinedLocalAndExportSymbolFlags(symbol: Symbol): SymbolFlags;
-    function isWriteOnlyAccess(node: Node): boolean;
-    function isWriteAccess(node: Node): boolean;
-    function compareDataObjects(dst: any, src: any): boolean;
-    /**
-     * clears already present map by calling onDeleteExistingValue callback before deleting that key/value
-     */
-    function clearMap<T>(map: Map<T>, onDeleteValue: (valueInMap: T, key: string) => void): void;
-    interface MutateMapOptions<T, U> {
-        createNewValue(key: string, valueInNewMap: U): T;
-        onDeleteValue(existingValue: T, key: string): void;
-        /**
-         * If present this is called with the key when there is value for that key both in new map as well as existing map provided
-         * Caller can then decide to update or remove this key.
-         * If the key is removed, caller will get callback of createNewValue for that key.
-         * If this callback is not provided, the value of such keys is not updated.
-         */
-        onExistingValue?(existingValue: T, valueInNewMap: U, key: string): void;
-    }
-    /**
-     * Mutates the map with newMap such that keys in map will be same as newMap.
-     */
-    function mutateMap<T, U>(map: Map<T>, newMap: ReadonlyMap<U>, options: MutateMapOptions<T, U>): void;
-    /** Calls `callback` on `directory` and every ancestor directory it has, returning the first defined result. */
-    function forEachAncestorDirectory<T>(directory: string, callback: (directory: string) => T | undefined): T | undefined;
-    function isAbstractConstructorType(type: Type): boolean;
-    function isAbstractConstructorSymbol(symbol: Symbol): boolean;
-    function getClassLikeDeclarationOfSymbol(symbol: Symbol): ClassLikeDeclaration | undefined;
-    function getObjectFlags(type: Type): ObjectFlags;
-    function typeHasCallOrConstructSignatures(type: Type, checker: TypeChecker): boolean;
-    function forSomeAncestorDirectory(directory: string, callback: (directory: string) => boolean): boolean;
-    function isUMDExportSymbol(symbol: Symbol | undefined): boolean | undefined;
-    function showModuleSpecifier({ moduleSpecifier }: ImportDeclaration): string;
-    function getLastChild(node: Node): Node | undefined;
-    /** Add a value to a set, and return true if it wasn't already present. */
-    function addToSeen(seen: Map<true>, key: string | number): boolean;
-    function addToSeen<T>(seen: Map<T>, key: string | number, value: T): boolean;
-    function isObjectTypeDeclaration(node: Node): node is ObjectTypeDeclaration;
-}
-declare namespace ts {
-    function getDefaultLibFileName(options: CompilerOptions): string;
-    function textSpanEnd(span: TextSpan): number;
-    function textSpanIsEmpty(span: TextSpan): boolean;
-    function textSpanContainsPosition(span: TextSpan, position: number): boolean;
-    function textSpanContainsTextSpan(span: TextSpan, other: TextSpan): boolean;
-    function textSpanOverlapsWith(span: TextSpan, other: TextSpan): boolean;
-    function textSpanOverlap(span1: TextSpan, span2: TextSpan): TextSpan | undefined;
-    function textSpanIntersectsWithTextSpan(span: TextSpan, other: TextSpan): boolean;
-    function textSpanIntersectsWith(span: TextSpan, start: number, length: number): boolean;
-    function decodedTextSpanIntersectsWith(start1: number, length1: number, start2: number, length2: number): boolean;
-    function textSpanIntersectsWithPosition(span: TextSpan, position: number): boolean;
-    function textSpanIntersection(span1: TextSpan, span2: TextSpan): TextSpan | undefined;
-    function createTextSpan(start: number, length: number): TextSpan;
-    function createTextRange(pos: number, end?: number): TextRange;
-    function createTextSpanFromBounds(start: number, end: number): TextSpan;
-    function textChangeRangeNewSpan(range: TextChangeRange): TextSpan;
-    function textChangeRangeIsUnchanged(range: TextChangeRange): boolean;
-    function createTextChangeRange(span: TextSpan, newLength: number): TextChangeRange;
-    let unchangedTextChangeRange: TextChangeRange;
-    /**
-     * Called to merge all the changes that occurred across several versions of a script snapshot
-     * into a single change.  i.e. if a user keeps making successive edits to a script we will
-     * have a text change from V1 to V2, V2 to V3, ..., Vn.
-     *
-     * This function will then merge those changes into a single change range valid between V1 and
-     * Vn.
-     */
-    function collapseTextChangeRangesAcrossMultipleVersions(changes: ReadonlyArray<TextChangeRange>): TextChangeRange;
-    function getTypeParameterOwner(d: Declaration): Declaration | undefined;
-    type ParameterPropertyDeclaration = ParameterDeclaration & {
-        parent: ConstructorDeclaration;
-        name: Identifier;
-    };
-    function isParameterPropertyDeclaration(node: Node): node is ParameterPropertyDeclaration;
-    function isEmptyBindingPattern(node: BindingName): node is BindingPattern;
-    function isEmptyBindingElement(node: BindingElement): boolean;
-    function getCombinedModifierFlags(node: Node): ModifierFlags;
-    function getCombinedNodeFlags(node: Node): NodeFlags;
-    /**
-     * Checks to see if the locale is in the appropriate format,
-     * and if it is, attempts to set the appropriate language.
-     */
-    function validateLocaleAndSetLanguage(locale: string, sys: {
-        getExecutingFilePath(): string;
-        resolvePath(path: string): string;
-        fileExists(fileName: string): boolean;
-        readFile(fileName: string): string | undefined;
-    }, errors?: Push<Diagnostic>): void;
-    function getOriginalNode(node: Node): Node;
-    function getOriginalNode<T extends Node>(node: Node, nodeTest: (node: Node) => node is T): T;
-    function getOriginalNode(node: Node | undefined): Node | undefined;
-    function getOriginalNode<T extends Node>(node: Node | undefined, nodeTest: (node: Node | undefined) => node is T): T | undefined;
-    /**
-     * Gets a value indicating whether a node originated in the parse tree.
-     *
-     * @param node The node to test.
-     */
-    function isParseTreeNode(node: Node): boolean;
-    /**
-     * Gets the original parse tree node for a node.
-     *
-     * @param node The original node.
-     * @returns The original parse tree node if found; otherwise, undefined.
-     */
-    function getParseTreeNode(node: Node): Node;
-    /**
-     * Gets the original parse tree node for a node.
-     *
-     * @param node The original node.
-     * @param nodeTest A callback used to ensure the correct type of parse tree node is returned.
-     * @returns The original parse tree node if found; otherwise, undefined.
-     */
-    function getParseTreeNode<T extends Node>(node: Node | undefined, nodeTest?: (node: Node) => node is T): T | undefined;
-    /**
-     * Remove extra underscore from escaped identifier text content.
-     *
-     * @param identifier The escaped identifier text.
-     * @returns The unescaped identifier text.
-     */
-    function unescapeLeadingUnderscores(identifier: __String): string;
-    function idText(identifier: Identifier): string;
-    function symbolName(symbol: Symbol): string;
-    /**
-     * Remove extra underscore from escaped identifier text content.
-     * @deprecated Use `id.text` for the unescaped text.
-     * @param identifier The escaped identifier text.
-     * @returns The unescaped identifier text.
-     */
-    function unescapeIdentifier(id: string): string;
-    function getNameOfJSDocTypedef(declaration: JSDocTypedefTag): Identifier | undefined;
-    /** @internal */
-    function isNamedDeclaration(node: Node): node is NamedDeclaration & {
-        name: DeclarationName;
-    };
-    function getNameOfDeclaration(declaration: Declaration | Expression): DeclarationName;
-    /**
-     * Gets the JSDoc parameter tags for the node if present.
-     *
-     * @remarks Returns any JSDoc param tag that matches the provided
-     * parameter, whether a param tag on a containing function
-     * expression, or a param tag on a variable declaration whose
-     * initializer is the containing function. The tags closest to the
-     * node are returned first, so in the previous example, the param
-     * tag on the containing function expression would be first.
-     *
-     * Does not return tags for binding patterns, because JSDoc matches
-     * parameters by name and binding patterns do not have a name.
-     */
-    function getJSDocParameterTags(param: ParameterDeclaration): ReadonlyArray<JSDocParameterTag>;
-    /**
-     * Return true if the node has JSDoc parameter tags.
-     *
-     * @remarks Includes parameter tags that are not directly on the node,
-     * for example on a variable declaration whose initializer is a function expression.
-     */
-    function hasJSDocParameterTags(node: FunctionLikeDeclaration | SignatureDeclaration): boolean;
-    /** Gets the JSDoc augments tag for the node if present */
-    function getJSDocAugmentsTag(node: Node): JSDocAugmentsTag | undefined;
-    /** Gets the JSDoc class tag for the node if present */
-    function getJSDocClassTag(node: Node): JSDocClassTag | undefined;
-    /** Gets the JSDoc return tag for the node if present */
-    function getJSDocReturnTag(node: Node): JSDocReturnTag | undefined;
-    /** Gets the JSDoc template tag for the node if present */
-    function getJSDocTemplateTag(node: Node): JSDocTemplateTag | undefined;
-    /** Gets the JSDoc type tag for the node if present and valid */
-    function getJSDocTypeTag(node: Node): JSDocTypeTag | undefined;
-    /**
-     * Gets the type node for the node if provided via JSDoc.
-     *
-     * @remarks The search includes any JSDoc param tag that relates
-     * to the provided parameter, for example a type tag on the
-     * parameter itself, or a param tag on a containing function
-     * expression, or a param tag on a variable declaration whose
-     * initializer is the containing function. The tags closest to the
-     * node are examined first, so in the previous example, the type
-     * tag directly on the node would be returned.
-     */
-    function getJSDocType(node: Node): TypeNode | undefined;
-    /**
-     * Gets the return type node for the node if provided via JSDoc's return tag.
-     *
-     * @remarks `getJSDocReturnTag` just gets the whole JSDoc tag. This function
-     * gets the type from inside the braces.
-     */
-    function getJSDocReturnType(node: Node): TypeNode | undefined;
-    /** Get all JSDoc tags related to a node, including those on parent nodes. */
-    function getJSDocTags(node: Node): ReadonlyArray<JSDocTag>;
-    /** Gets all JSDoc tags of a specified kind, or undefined if not present. */
-    function getAllJSDocTagsOfKind(node: Node, kind: SyntaxKind): ReadonlyArray<JSDocTag>;
-}
-declare namespace ts {
-    function isNumericLiteral(node: Node): node is NumericLiteral;
-    function isStringLiteral(node: Node): node is StringLiteral;
-    function isJsxText(node: Node): node is JsxText;
-    function isRegularExpressionLiteral(node: Node): node is RegularExpressionLiteral;
-    function isNoSubstitutionTemplateLiteral(node: Node): node is NoSubstitutionTemplateLiteral;
-    function isTemplateHead(node: Node): node is TemplateHead;
-    function isTemplateMiddle(node: Node): node is TemplateMiddle;
-    function isTemplateTail(node: Node): node is TemplateTail;
-    function isIdentifier(node: Node): node is Identifier;
-    function isQualifiedName(node: Node): node is QualifiedName;
-    function isComputedPropertyName(node: Node): node is ComputedPropertyName;
-    function isTypeParameterDeclaration(node: Node): node is TypeParameterDeclaration;
-    function isParameter(node: Node): node is ParameterDeclaration;
-    function isDecorator(node: Node): node is Decorator;
-    function isPropertySignature(node: Node): node is PropertySignature;
-    function isPropertyDeclaration(node: Node): node is PropertyDeclaration;
-    function isMethodSignature(node: Node): node is MethodSignature;
-    function isMethodDeclaration(node: Node): node is MethodDeclaration;
-    function isConstructorDeclaration(node: Node): node is ConstructorDeclaration;
-    function isGetAccessorDeclaration(node: Node): node is GetAccessorDeclaration;
-    function isSetAccessorDeclaration(node: Node): node is SetAccessorDeclaration;
-    function isCallSignatureDeclaration(node: Node): node is CallSignatureDeclaration;
-    function isConstructSignatureDeclaration(node: Node): node is ConstructSignatureDeclaration;
-    function isIndexSignatureDeclaration(node: Node): node is IndexSignatureDeclaration;
-    function isGetOrSetAccessorDeclaration(node: Node): node is AccessorDeclaration;
-    function isTypePredicateNode(node: Node): node is TypePredicateNode;
-    function isTypeReferenceNode(node: Node): node is TypeReferenceNode;
-    function isFunctionTypeNode(node: Node): node is FunctionTypeNode;
-    function isConstructorTypeNode(node: Node): node is ConstructorTypeNode;
-    function isTypeQueryNode(node: Node): node is TypeQueryNode;
-    function isTypeLiteralNode(node: Node): node is TypeLiteralNode;
-    function isArrayTypeNode(node: Node): node is ArrayTypeNode;
-    function isTupleTypeNode(node: Node): node is TupleTypeNode;
-    function isUnionTypeNode(node: Node): node is UnionTypeNode;
-    function isIntersectionTypeNode(node: Node): node is IntersectionTypeNode;
-    function isConditionalTypeNode(node: Node): node is ConditionalTypeNode;
-    function isInferTypeNode(node: Node): node is InferTypeNode;
-    function isParenthesizedTypeNode(node: Node): node is ParenthesizedTypeNode;
-    function isThisTypeNode(node: Node): node is ThisTypeNode;
-    function isTypeOperatorNode(node: Node): node is TypeOperatorNode;
-    function isIndexedAccessTypeNode(node: Node): node is IndexedAccessTypeNode;
-    function isMappedTypeNode(node: Node): node is MappedTypeNode;
-    function isLiteralTypeNode(node: Node): node is LiteralTypeNode;
-    function isImportTypeNode(node: Node): node is ImportTypeNode;
-    function isObjectBindingPattern(node: Node): node is ObjectBindingPattern;
-    function isArrayBindingPattern(node: Node): node is ArrayBindingPattern;
-    function isBindingElement(node: Node): node is BindingElement;
-    function isArrayLiteralExpression(node: Node): node is ArrayLiteralExpression;
-    function isObjectLiteralExpression(node: Node): node is ObjectLiteralExpression;
-    function isPropertyAccessExpression(node: Node): node is PropertyAccessExpression;
-    function isElementAccessExpression(node: Node): node is ElementAccessExpression;
-    function isCallExpression(node: Node): node is CallExpression;
-    function isNewExpression(node: Node): node is NewExpression;
-    function isTaggedTemplateExpression(node: Node): node is TaggedTemplateExpression;
-    function isTypeAssertion(node: Node): node is TypeAssertion;
-    function isParenthesizedExpression(node: Node): node is ParenthesizedExpression;
-    function skipPartiallyEmittedExpressions(node: Expression): Expression;
-    function skipPartiallyEmittedExpressions(node: Node): Node;
-    function isFunctionExpression(node: Node): node is FunctionExpression;
-    function isArrowFunction(node: Node): node is ArrowFunction;
-    function isDeleteExpression(node: Node): node is DeleteExpression;
-    function isTypeOfExpression(node: Node): node is TypeOfExpression;
-    function isVoidExpression(node: Node): node is VoidExpression;
-    function isAwaitExpression(node: Node): node is AwaitExpression;
-    function isPrefixUnaryExpression(node: Node): node is PrefixUnaryExpression;
-    function isPostfixUnaryExpression(node: Node): node is PostfixUnaryExpression;
-    function isBinaryExpression(node: Node): node is BinaryExpression;
-    function isConditionalExpression(node: Node): node is ConditionalExpression;
-    function isTemplateExpression(node: Node): node is TemplateExpression;
-    function isYieldExpression(node: Node): node is YieldExpression;
-    function isSpreadElement(node: Node): node is SpreadElement;
-    function isClassExpression(node: Node): node is ClassExpression;
-    function isOmittedExpression(node: Node): node is OmittedExpression;
-    function isExpressionWithTypeArguments(node: Node): node is ExpressionWithTypeArguments;
-    function isAsExpression(node: Node): node is AsExpression;
-    function isNonNullExpression(node: Node): node is NonNullExpression;
-    function isMetaProperty(node: Node): node is MetaProperty;
-    function isTemplateSpan(node: Node): node is TemplateSpan;
-    function isSemicolonClassElement(node: Node): node is SemicolonClassElement;
-    function isBlock(node: Node): node is Block;
-    function isVariableStatement(node: Node): node is VariableStatement;
-    function isEmptyStatement(node: Node): node is EmptyStatement;
-    function isExpressionStatement(node: Node): node is ExpressionStatement;
-    function isIfStatement(node: Node): node is IfStatement;
-    function isDoStatement(node: Node): node is DoStatement;
-    function isWhileStatement(node: Node): node is WhileStatement;
-    function isForStatement(node: Node): node is ForStatement;
-    function isForInStatement(node: Node): node is ForInStatement;
-    function isForOfStatement(node: Node): node is ForOfStatement;
-    function isContinueStatement(node: Node): node is ContinueStatement;
-    function isBreakStatement(node: Node): node is BreakStatement;
-    function isBreakOrContinueStatement(node: Node): node is BreakOrContinueStatement;
-    function isReturnStatement(node: Node): node is ReturnStatement;
-    function isWithStatement(node: Node): node is WithStatement;
-    function isSwitchStatement(node: Node): node is SwitchStatement;
-    function isLabeledStatement(node: Node): node is LabeledStatement;
-    function isThrowStatement(node: Node): node is ThrowStatement;
-    function isTryStatement(node: Node): node is TryStatement;
-    function isDebuggerStatement(node: Node): node is DebuggerStatement;
-    function isVariableDeclaration(node: Node): node is VariableDeclaration;
-    function isVariableDeclarationList(node: Node): node is VariableDeclarationList;
-    function isFunctionDeclaration(node: Node): node is FunctionDeclaration;
-    function isClassDeclaration(node: Node): node is ClassDeclaration;
-    function isInterfaceDeclaration(node: Node): node is InterfaceDeclaration;
-    function isTypeAliasDeclaration(node: Node): node is TypeAliasDeclaration;
-    function isEnumDeclaration(node: Node): node is EnumDeclaration;
-    function isModuleDeclaration(node: Node): node is ModuleDeclaration;
-    function isModuleBlock(node: Node): node is ModuleBlock;
-    function isCaseBlock(node: Node): node is CaseBlock;
-    function isNamespaceExportDeclaration(node: Node): node is NamespaceExportDeclaration;
-    function isImportEqualsDeclaration(node: Node): node is ImportEqualsDeclaration;
-    function isImportDeclaration(node: Node): node is ImportDeclaration;
-    function isImportClause(node: Node): node is ImportClause;
-    function isNamespaceImport(node: Node): node is NamespaceImport;
-    function isNamedImports(node: Node): node is NamedImports;
-    function isImportSpecifier(node: Node): node is ImportSpecifier;
-    function isExportAssignment(node: Node): node is ExportAssignment;
-    function isExportDeclaration(node: Node): node is ExportDeclaration;
-    function isNamedExports(node: Node): node is NamedExports;
-    function isExportSpecifier(node: Node): node is ExportSpecifier;
-    function isMissingDeclaration(node: Node): node is MissingDeclaration;
-    function isExternalModuleReference(node: Node): node is ExternalModuleReference;
-    function isJsxElement(node: Node): node is JsxElement;
-    function isJsxSelfClosingElement(node: Node): node is JsxSelfClosingElement;
-    function isJsxOpeningElement(node: Node): node is JsxOpeningElement;
-    function isJsxClosingElement(node: Node): node is JsxClosingElement;
-    function isJsxFragment(node: Node): node is JsxFragment;
-    function isJsxOpeningFragment(node: Node): node is JsxOpeningFragment;
-    function isJsxClosingFragment(node: Node): node is JsxClosingFragment;
-    function isJsxAttribute(node: Node): node is JsxAttribute;
-    function isJsxAttributes(node: Node): node is JsxAttributes;
-    function isJsxSpreadAttribute(node: Node): node is JsxSpreadAttribute;
-    function isJsxExpression(node: Node): node is JsxExpression;
-    function isCaseClause(node: Node): node is CaseClause;
-    function isDefaultClause(node: Node): node is DefaultClause;
-    function isHeritageClause(node: Node): node is HeritageClause;
-    function isCatchClause(node: Node): node is CatchClause;
-    function isPropertyAssignment(node: Node): node is PropertyAssignment;
-    function isShorthandPropertyAssignment(node: Node): node is ShorthandPropertyAssignment;
-    function isSpreadAssignment(node: Node): node is SpreadAssignment;
-    function isEnumMember(node: Node): node is EnumMember;
-    function isSourceFile(node: Node): node is SourceFile;
-    function isBundle(node: Node): node is Bundle;
-    function isUnparsedSource(node: Node): node is UnparsedSource;
-    function isJSDocTypeExpression(node: Node): node is JSDocTypeExpression;
-    function isJSDocAllType(node: JSDocAllType): node is JSDocAllType;
-    function isJSDocUnknownType(node: Node): node is JSDocUnknownType;
-    function isJSDocNullableType(node: Node): node is JSDocNullableType;
-    function isJSDocNonNullableType(node: Node): node is JSDocNonNullableType;
-    function isJSDocOptionalType(node: Node): node is JSDocOptionalType;
-    function isJSDocFunctionType(node: Node): node is JSDocFunctionType;
-    function isJSDocVariadicType(node: Node): node is JSDocVariadicType;
-    function isJSDoc(node: Node): node is JSDoc;
-    function isJSDocAugmentsTag(node: Node): node is JSDocAugmentsTag;
-    function isJSDocClassTag(node: Node): node is JSDocClassTag;
-    function isJSDocParameterTag(node: Node): node is JSDocParameterTag;
-    function isJSDocReturnTag(node: Node): node is JSDocReturnTag;
-    function isJSDocTypeTag(node: Node): node is JSDocTypeTag;
-    function isJSDocTemplateTag(node: Node): node is JSDocTemplateTag;
-    function isJSDocTypedefTag(node: Node): node is JSDocTypedefTag;
-    function isJSDocPropertyTag(node: Node): node is JSDocPropertyTag;
-    function isJSDocPropertyLikeTag(node: Node): node is JSDocPropertyLikeTag;
-    function isJSDocTypeLiteral(node: Node): node is JSDocTypeLiteral;
-    function isJSDocCallbackTag(node: Node): node is JSDocCallbackTag;
-    function isJSDocSignature(node: Node): node is JSDocSignature;
-}
-declare namespace ts {
-    function isSyntaxList(n: Node): n is SyntaxList;
-    function isNode(node: Node): boolean;
-    function isNodeKind(kind: SyntaxKind): boolean;
-    /**
-     * True if node is of some token syntax kind.
-     * For example, this is true for an IfKeyword but not for an IfStatement.
-     * Literals are considered tokens, except TemplateLiteral, but does include TemplateHead/Middle/Tail.
-     */
-    function isToken(n: Node): boolean;
-    function isNodeArray<T extends Node>(array: ReadonlyArray<T>): array is NodeArray<T>;
-    function isLiteralKind(kind: SyntaxKind): boolean;
-    function isLiteralExpression(node: Node): node is LiteralExpression;
-    function isTemplateLiteralKind(kind: SyntaxKind): boolean;
-    type TemplateLiteralToken = NoSubstitutionTemplateLiteral | TemplateHead | TemplateMiddle | TemplateTail;
-    function isTemplateLiteralToken(node: Node): node is TemplateLiteralToken;
-    function isTemplateMiddleOrTemplateTail(node: Node): node is TemplateMiddle | TemplateTail;
-    function isStringTextContainingNode(node: Node): node is StringLiteral | TemplateLiteralToken;
-    function isGeneratedIdentifier(node: Node): node is GeneratedIdentifier;
-    function isModifierKind(token: SyntaxKind): boolean;
-    function isParameterPropertyModifier(kind: SyntaxKind): boolean;
-    function isClassMemberModifier(idToken: SyntaxKind): boolean;
-    function isModifier(node: Node): node is Modifier;
-    function isEntityName(node: Node): node is EntityName;
-    function isPropertyName(node: Node): node is PropertyName;
-    function isBindingName(node: Node): node is BindingName;
-    function isFunctionLike(node: Node): node is SignatureDeclaration;
-    function isFunctionLikeDeclaration(node: Node): node is FunctionLikeDeclaration;
-    function isFunctionLikeKind(kind: SyntaxKind): boolean;
-    function isFunctionOrModuleBlock(node: Node): boolean;
-    function isClassElement(node: Node): node is ClassElement;
-    function isClassLike(node: Node): node is ClassLikeDeclaration;
-    function isAccessor(node: Node): node is AccessorDeclaration;
-    function isMethodOrAccessor(node: Node): node is MethodDeclaration | AccessorDeclaration;
-    function isTypeElement(node: Node): node is TypeElement;
-    function isClassOrTypeElement(node: Node): node is ClassElement | TypeElement;
-    function isObjectLiteralElementLike(node: Node): node is ObjectLiteralElementLike;
-    /**
-     * Node test that determines whether a node is a valid type node.
-     * This differs from the `isPartOfTypeNode` function which determines whether a node is *part*
-     * of a TypeNode.
-     */
-    function isTypeNode(node: Node): node is TypeNode;
-    function isFunctionOrConstructorTypeNode(node: Node): node is FunctionTypeNode | ConstructorTypeNode;
-    function isBindingPattern(node: Node | undefined): node is BindingPattern;
-    function isAssignmentPattern(node: Node): node is AssignmentPattern;
-    function isArrayBindingElement(node: Node): node is ArrayBindingElement;
-    /**
-     * Determines whether the BindingOrAssignmentElement is a BindingElement-like declaration
-     */
-    function isDeclarationBindingElement(bindingElement: BindingOrAssignmentElement): bindingElement is VariableDeclaration | ParameterDeclaration | BindingElement;
-    /**
-     * Determines whether a node is a BindingOrAssignmentPattern
-     */
-    function isBindingOrAssignmentPattern(node: BindingOrAssignmentElementTarget): node is BindingOrAssignmentPattern;
-    /**
-     * Determines whether a node is an ObjectBindingOrAssignmentPattern
-     */
-    function isObjectBindingOrAssignmentPattern(node: BindingOrAssignmentElementTarget): node is ObjectBindingOrAssignmentPattern;
-    /**
-     * Determines whether a node is an ArrayBindingOrAssignmentPattern
-     */
-    function isArrayBindingOrAssignmentPattern(node: BindingOrAssignmentElementTarget): node is ArrayBindingOrAssignmentPattern;
-    function isPropertyAccessOrQualifiedNameOrImportTypeNode(node: Node): node is PropertyAccessExpression | QualifiedName | ImportTypeNode;
-    function isPropertyAccessOrQualifiedName(node: Node): node is PropertyAccessExpression | QualifiedName;
-    function isCallLikeExpression(node: Node): node is CallLikeExpression;
-    function isCallOrNewExpression(node: Node): node is CallExpression | NewExpression;
-    function isTemplateLiteral(node: Node): node is TemplateLiteral;
-    function isLeftHandSideExpression(node: Node): node is LeftHandSideExpression;
-    function isUnaryExpression(node: Node): node is UnaryExpression;
-    function isUnaryExpressionWithWrite(expr: Node): expr is PrefixUnaryExpression | PostfixUnaryExpression;
-    /**
-     * Determines whether a node is an expression based only on its kind.
-     * Use `isExpressionNode` if not in transforms.
-     */
-    function isExpression(node: Node): node is Expression;
-    function isAssertionExpression(node: Node): node is AssertionExpression;
-    function isPartiallyEmittedExpression(node: Node): node is PartiallyEmittedExpression;
-    function isNotEmittedStatement(node: Node): node is NotEmittedStatement;
-    function isNotEmittedOrPartiallyEmittedNode(node: Node): node is NotEmittedStatement | PartiallyEmittedExpression;
-    function isIterationStatement(node: Node, lookInLabeledStatements: false): node is IterationStatement;
-    function isIterationStatement(node: Node, lookInLabeledStatements: boolean): node is IterationStatement | LabeledStatement;
-    function isForInOrOfStatement(node: Node): node is ForInOrOfStatement;
-    function isConciseBody(node: Node): node is ConciseBody;
-    function isFunctionBody(node: Node): node is FunctionBody;
-    function isForInitializer(node: Node): node is ForInitializer;
-    function isModuleBody(node: Node): node is ModuleBody;
-    function isNamespaceBody(node: Node): node is NamespaceBody;
-    function isJSDocNamespaceBody(node: Node): node is JSDocNamespaceBody;
-    function isNamedImportBindings(node: Node): node is NamedImportBindings;
-    function isModuleOrEnumDeclaration(node: Node): node is ModuleDeclaration | EnumDeclaration;
-    function isDeclaration(node: Node): node is NamedDeclaration;
-    function isDeclarationStatement(node: Node): node is DeclarationStatement;
-    /**
-     * Determines whether the node is a statement that is not also a declaration
-     */
-    function isStatementButNotDeclaration(node: Node): node is Statement;
-    function isStatement(node: Node): node is Statement;
-    function isModuleReference(node: Node): node is ModuleReference;
-    function isJsxTagNameExpression(node: Node): node is JsxTagNameExpression;
-    function isJsxChild(node: Node): node is JsxChild;
-    function isJsxAttributeLike(node: Node): node is JsxAttributeLike;
-    function isStringLiteralOrJsxExpression(node: Node): node is StringLiteral | JsxExpression;
-    function isJsxOpeningLikeElement(node: Node): node is JsxOpeningLikeElement;
-    function isCaseOrDefaultClause(node: Node): node is CaseOrDefaultClause;
-    /** True if node is of some JSDoc syntax kind. */
-    function isJSDocNode(node: Node): boolean;
-    /** True if node is of a kind that may contain comment text. */
-    function isJSDocCommentContainingNode(node: Node): boolean;
-    function isJSDocTag(node: Node): boolean;
-    function isSetAccessor(node: Node): node is SetAccessorDeclaration;
-    function isGetAccessor(node: Node): node is GetAccessorDeclaration;
-    /** True if has jsdoc nodes attached to it. */
-    function hasJSDocNodes(node: Node): node is HasJSDoc;
-    /** True if has type node attached to it. */
-    function hasType(node: Node): node is HasType;
-    function couldHaveType(node: Node): node is HasType;
-    /** True if has initializer node attached to it. */
-    function hasInitializer(node: Node): node is HasInitializer;
-    /** True if has initializer node attached to it. */
-    function hasOnlyExpressionInitializer(node: Node): node is HasExpressionInitializer;
-    function isObjectLiteralElement(node: Node): node is ObjectLiteralElement;
-    function isTypeReferenceType(node: Node): node is TypeReferenceType;
-    function guessIndentation(lines: string[]): number | undefined;
-    function isStringLiteralLike(node: Node): node is StringLiteralLike;
-    /** @internal */
-    function isNamedImportsOrExports(node: Node): node is NamedImportsOrExports;
-    interface ObjectAllocator {
-        getNodeConstructor(): new (kind: SyntaxKind, pos?: number, end?: number) => Node;
-        getTokenConstructor(): new <TKind extends SyntaxKind>(kind: TKind, pos?: number, end?: number) => Token<TKind>;
-        getIdentifierConstructor(): new (kind: SyntaxKind.Identifier, pos?: number, end?: number) => Identifier;
-        getSourceFileConstructor(): new (kind: SyntaxKind.SourceFile, pos?: number, end?: number) => SourceFile;
-        getSymbolConstructor(): new (flags: SymbolFlags, name: __String) => Symbol;
-        getTypeConstructor(): new (checker: TypeChecker, flags: TypeFlags) => Type;
-        getSignatureConstructor(): new (checker: TypeChecker) => Signature;
-        getSourceMapSourceConstructor(): new (fileName: string, text: string, skipTrivia?: (pos: number) => number) => SourceMapSource;
-    }
-    let objectAllocator: ObjectAllocator;
-    function formatStringFromArgs(text: string, args: ArrayLike<string>, baseIndex?: number): string;
-    let localizedDiagnosticMessages: MapLike<string> | undefined;
-    function getLocaleSpecificMessage(message: DiagnosticMessage): string;
-    function createFileDiagnostic(file: SourceFile, start: number, length: number, message: DiagnosticMessage, ...args: (string | number | undefined)[]): DiagnosticWithLocation;
-    function formatMessage(_dummy: any, message: DiagnosticMessage): string;
-    function createCompilerDiagnostic(message: DiagnosticMessage, ...args: (string | number | undefined)[]): Diagnostic;
-    function createCompilerDiagnosticFromMessageChain(chain: DiagnosticMessageChain): Diagnostic;
-    function chainDiagnosticMessages(details: DiagnosticMessageChain | undefined, message: DiagnosticMessage, ...args: (string | undefined)[]): DiagnosticMessageChain;
-    function concatenateDiagnosticMessageChains(headChain: DiagnosticMessageChain, tailChain: DiagnosticMessageChain): DiagnosticMessageChain;
-    function compareDiagnostics(d1: Diagnostic, d2: Diagnostic): Comparison;
-    function getEmitScriptTarget(compilerOptions: CompilerOptions): ScriptTarget;
-    function getEmitModuleKind(compilerOptions: {
-        module?: CompilerOptions["module"];
-        target?: CompilerOptions["target"];
-    }): ModuleKind;
-    function getEmitModuleResolutionKind(compilerOptions: CompilerOptions): ModuleResolutionKind;
-    function unreachableCodeIsError(options: CompilerOptions): boolean;
-    function unusedLabelIsError(options: CompilerOptions): boolean;
-    function getAreDeclarationMapsEnabled(options: CompilerOptions): boolean;
-    function getAllowSyntheticDefaultImports(compilerOptions: CompilerOptions): boolean;
-    function getEmitDeclarations(compilerOptions: CompilerOptions): boolean;
-    type StrictOptionName = "noImplicitAny" | "noImplicitThis" | "strictNullChecks" | "strictFunctionTypes" | "strictPropertyInitialization" | "alwaysStrict";
-    function getStrictOptionValue(compilerOptions: CompilerOptions, flag: StrictOptionName): boolean;
-    function hasZeroOrOneAsteriskCharacter(str: string): boolean;
-    /**
-     * Internally, we represent paths as strings with '/' as the directory separator.
-     * When we make system calls (eg: LanguageServiceHost.getDirectory()),
-     * we expect the host to correctly handle paths in our specified format.
-     */
-    const directorySeparator = "/";
-    /**
-     * Normalize path separators.
-     */
-    function normalizeSlashes(path: string): string;
-    /**
-     * Returns length of the root part of a path or URL (i.e. length of "/", "x:/", "//server/share/, file:///user/files").
-     *
-     * For example:
-     * ```ts
-     * getRootLength("a") === 0                   // ""
-     * getRootLength("/") === 1                   // "/"
-     * getRootLength("c:") === 2                  // "c:"
-     * getRootLength("c:d") === 0                 // ""
-     * getRootLength("c:/") === 3                 // "c:/"
-     * getRootLength("c:\\") === 3                // "c:\\"
-     * getRootLength("//server") === 7            // "//server"
-     * getRootLength("//server/share") === 8      // "//server/"
-     * getRootLength("\\\\server") === 7          // "\\\\server"
-     * getRootLength("\\\\server\\share") === 8   // "\\\\server\\"
-     * getRootLength("file:///path") === 8        // "file:///"
-     * getRootLength("file:///c:") === 10         // "file:///c:"
-     * getRootLength("file:///c:d") === 8         // "file:///"
-     * getRootLength("file:///c:/path") === 11    // "file:///c:/"
-     * getRootLength("file://server") === 13      // "file://server"
-     * getRootLength("file://server/path") === 14 // "file://server/"
-     * getRootLength("http://server") === 13      // "http://server"
-     * getRootLength("http://server/path") === 14 // "http://server/"
-     * ```
-     */
-    function getRootLength(path: string): number;
-    function normalizePath(path: string): string;
-    function normalizePathAndParts(path: string): {
-        path: string;
-        parts: string[];
-    };
-    /**
-     * Returns the path except for its basename. Semantics align with NodeJS's `path.dirname`
-     * except that we support URL's as well.
-     *
-     * ```ts
-     * getDirectoryPath("/path/to/file.ext") === "/path/to"
-     * getDirectoryPath("/path/to/") === "/path"
-     * getDirectoryPath("/") === "/"
-     * ```
-     */
-    function getDirectoryPath(path: Path): Path;
-    /**
-     * Returns the path except for its basename. Semantics align with NodeJS's `path.dirname`
-     * except that we support URL's as well.
-     *
-     * ```ts
-     * getDirectoryPath("/path/to/file.ext") === "/path/to"
-     * getDirectoryPath("/path/to/") === "/path"
-     * getDirectoryPath("/") === "/"
-     * ```
-     */
-    function getDirectoryPath(path: string): string;
-    function isUrl(path: string): boolean;
-    function pathIsRelative(path: string): boolean;
-    /**
-     * Determines whether a path is an absolute path (e.g. starts with `/`, or a dos path
-     * like `c:`, `c:\` or `c:/`).
-     */
-    function isRootedDiskPath(path: string): boolean;
-    /**
-     * Determines whether a path consists only of a path root.
-     */
-    function isDiskPathRoot(path: string): boolean;
-    function convertToRelativePath(absoluteOrRelativePath: string, basePath: string, getCanonicalFileName: (path: string) => string): string;
-    /**
-     * Parse a path into an array containing a root component (at index 0) and zero or more path
-     * components (at indices > 0). The result is not normalized.
-     * If the path is relative, the root component is `""`.
-     * If the path is absolute, the root component includes the first path separator (`/`).
-     */
-    function getPathComponents(path: string, currentDirectory?: string): string[];
-    /**
-     * Reduce an array of path components to a more simplified path by navigating any
-     * `"."` or `".."` entries in the path.
-     */
-    function reducePathComponents(components: ReadonlyArray<string>): string[];
-    /**
-     * Parse a path into an array containing a root component (at index 0) and zero or more path
-     * components (at indices > 0). The result is normalized.
-     * If the path is relative, the root component is `""`.
-     * If the path is absolute, the root component includes the first path separator (`/`).
-     */
-    function getNormalizedPathComponents(path: string, currentDirectory: string | undefined): string[];
-    function getNormalizedAbsolutePath(fileName: string, currentDirectory: string | undefined): string;
-    /**
-     * Formats a parsed path consisting of a root component (at index 0) and zero or more path
-     * segments (at indices > 0).
-     */
-    function getPathFromPathComponents(pathComponents: ReadonlyArray<string>): string;
-    function getRelativePathFromFile(from: string, to: string, getCanonicalFileName: GetCanonicalFileName): string;
-    /**
-     * Gets a relative path that can be used to traverse between `from` and `to`.
-     */
-    function getRelativePathFromDirectory(from: string, to: string, ignoreCase: boolean): string;
-    /**
-     * Gets a relative path that can be used to traverse between `from` and `to`.
-     */
-    function getRelativePathFromDirectory(fromDirectory: string, to: string, getCanonicalFileName: GetCanonicalFileName): string;
-    function getRelativePathToDirectoryOrUrl(directoryPathOrUrl: string, relativeOrAbsolutePath: string, currentDirectory: string, getCanonicalFileName: GetCanonicalFileName, isAbsolutePathAnUrl: boolean): string;
-    /**
-     * Ensures a path is either absolute (prefixed with `/` or `c:`) or dot-relative (prefixed
-     * with `./` or `../`) so as not to be confused with an unprefixed module name.
-     */
-    function ensurePathIsNonModuleName(path: string): string;
-    /**
-     * Returns the path except for its containing directory name.
-     * Semantics align with NodeJS's `path.basename` except that we support URL's as well.
-     *
-     * ```ts
-     * getBaseFileName("/path/to/file.ext") === "file.ext"
-     * getBaseFileName("/path/to/") === "to"
-     * getBaseFileName("/") === ""
-     * ```
-     */
-    function getBaseFileName(path: string): string;
-    /**
-     * Gets the portion of a path following the last (non-terminal) separator (`/`).
-     * Semantics align with NodeJS's `path.basename` except that we support URL's as well.
-     * If the base name has any one of the provided extensions, it is removed.
-     *
-     * ```ts
-     * getBaseFileName("/path/to/file.ext", ".ext", true) === "file"
-     * getBaseFileName("/path/to/file.js", ".ext", true) === "file.js"
-     * ```
-     */
-    function getBaseFileName(path: string, extensions: string | ReadonlyArray<string>, ignoreCase: boolean): string;
-    /**
-     * Combines paths. If a path is absolute, it replaces any previous path.
-     */
-    function combinePaths(path: string, ...paths: (string | undefined)[]): string;
-    /**
-     * Combines and resolves paths. If a path is absolute, it replaces any previous path. Any
-     * `.` and `..` path components are resolved.
-     */
-    function resolvePath(path: string, ...paths: (string | undefined)[]): string;
-    /**
-     * Determines whether a path has a trailing separator (`/` or `\\`).
-     */
-    function hasTrailingDirectorySeparator(path: string): boolean;
-    /**
-     * Removes a trailing directory separator from a path.
-     * @param path The path.
-     */
-    function removeTrailingDirectorySeparator(path: Path): Path;
-    function removeTrailingDirectorySeparator(path: string): string;
-    /**
-     * Adds a trailing directory separator to a path, if it does not already have one.
-     * @param path The path.
-     */
-    function ensureTrailingDirectorySeparator(path: Path): Path;
-    function ensureTrailingDirectorySeparator(path: string): string;
-    /**
-     * Performs a case-sensitive comparison of two paths.
-     */
-    function comparePathsCaseSensitive(a: string, b: string): Comparison;
-    /**
-     * Performs a case-insensitive comparison of two paths.
-     */
-    function comparePathsCaseInsensitive(a: string, b: string): Comparison;
-    function comparePaths(a: string, b: string, ignoreCase?: boolean): Comparison;
-    function comparePaths(a: string, b: string, currentDirectory: string, ignoreCase?: boolean): Comparison;
-    function containsPath(parent: string, child: string, ignoreCase?: boolean): boolean;
-    function containsPath(parent: string, child: string, currentDirectory: string, ignoreCase?: boolean): boolean;
-    function tryRemoveDirectoryPrefix(path: string, dirPath: string): string | undefined;
-    function hasExtension(fileName: string): boolean;
-    const commonPackageFolders: ReadonlyArray<string>;
-    function getRegularExpressionForWildcard(specs: ReadonlyArray<string> | undefined, basePath: string, usage: "files" | "directories" | "exclude"): string | undefined;
-    /**
-     * An "includes" path "foo" is implicitly a glob "foo/** /*" (without the space) if its last component has no extension,
-     * and does not contain any glob characters itself.
-     */
-    function isImplicitGlob(lastPathComponent: string): boolean;
-    interface FileSystemEntries {
-        readonly files: ReadonlyArray<string>;
-        readonly directories: ReadonlyArray<string>;
-    }
-    interface FileMatcherPatterns {
-        /** One pattern for each "include" spec. */
-        includeFilePatterns: ReadonlyArray<string> | undefined;
-        /** One pattern matching one of any of the "include" specs. */
-        includeFilePattern: string | undefined;
-        includeDirectoryPattern: string | undefined;
-        excludePattern: string | undefined;
-        basePaths: ReadonlyArray<string>;
-    }
-    /** @param path directory of the tsconfig.json */
-    function getFileMatcherPatterns(path: string, excludes: ReadonlyArray<string> | undefined, includes: ReadonlyArray<string> | undefined, useCaseSensitiveFileNames: boolean, currentDirectory: string): FileMatcherPatterns;
-    function getRegexFromPattern(pattern: string, useCaseSensitiveFileNames: boolean): RegExp;
-    /** @param path directory of the tsconfig.json */
-    function matchFiles(path: string, extensions: ReadonlyArray<string> | undefined, excludes: ReadonlyArray<string> | undefined, includes: ReadonlyArray<string> | undefined, useCaseSensitiveFileNames: boolean, currentDirectory: string, depth: number | undefined, getFileSystemEntries: (path: string) => FileSystemEntries): string[];
-    function ensureScriptKind(fileName: string, scriptKind: ScriptKind | undefined): ScriptKind;
-    function getScriptKindFromFileName(fileName: string): ScriptKind;
-    /**
-     *  List of supported extensions in order of file resolution precedence.
-     */
-    const supportedTypeScriptExtensions: ReadonlyArray<Extension>;
-    /** Must have ".d.ts" first because if ".ts" goes first, that will be detected as the extension instead of ".d.ts". */
-    const supportedTypescriptExtensionsForExtractExtension: ReadonlyArray<Extension>;
-    const supportedJavascriptExtensions: ReadonlyArray<Extension>;
-    function getSupportedExtensions(options?: CompilerOptions, extraFileExtensions?: ReadonlyArray<FileExtensionInfo>): ReadonlyArray<string>;
-    function hasJavaScriptFileExtension(fileName: string): boolean;
-    function hasTypeScriptFileExtension(fileName: string): boolean;
-    function isSupportedSourceFileName(fileName: string, compilerOptions?: CompilerOptions, extraFileExtensions?: ReadonlyArray<FileExtensionInfo>): boolean;
-    /**
-     * Extension boundaries by priority. Lower numbers indicate higher priorities, and are
-     * aligned to the offset of the highest priority extension in the
-     * allSupportedExtensions array.
-     */
-    enum ExtensionPriority {
-        TypeScriptFiles = 0,
-        DeclarationAndJavaScriptFiles = 2,
-        Highest = 0,
-        Lowest = 2
-    }
-    function getExtensionPriority(path: string, supportedExtensions: ReadonlyArray<string>): ExtensionPriority;
-    /**
-     * Adjusts an extension priority to be the highest priority within the same range.
-     */
-    function adjustExtensionPriority(extensionPriority: ExtensionPriority, supportedExtensions: ReadonlyArray<string>): ExtensionPriority;
-    /**
-     * Gets the next lowest extension priority for a given priority.
-     */
-    function getNextLowestExtensionPriority(extensionPriority: ExtensionPriority, supportedExtensions: ReadonlyArray<string>): ExtensionPriority;
-    function removeFileExtension(path: string): string;
-    function tryRemoveExtension(path: string, extension: string): string | undefined;
-    function removeExtension(path: string, extension: string): string;
-    function changeExtension<T extends string | Path>(path: T, newExtension: string): T;
-    function changeAnyExtension(path: string, ext: string): string;
-    function changeAnyExtension(path: string, ext: string, extensions: string | ReadonlyArray<string>, ignoreCase: boolean): string;
-    namespace Debug {
-        function showSymbol(symbol: Symbol): string;
-        function showSyntaxKind(node: Node): string;
-    }
-    function tryParsePattern(pattern: string): Pattern | undefined;
-    function positionIsSynthesized(pos: number): boolean;
-    /** True if an extension is one of the supported TypeScript extensions. */
-    function extensionIsTypeScript(ext: Extension): boolean;
-    function resolutionExtensionIsTypeScriptOrJson(ext: Extension): boolean;
-    /**
-     * Gets the extension from a path.
-     * Path must have a valid extension.
-     */
-    function extensionFromPath(path: string): Extension;
-    function isAnySupportedFileExtension(path: string): boolean;
-    function tryGetExtensionFromPath(path: string): Extension | undefined;
-    /**
-     * Gets the file extension for a path.
-     */
-    function getAnyExtensionFromPath(path: string): string;
-    /**
-     * Gets the file extension for a path, provided it is one of the provided extensions.
-     */
-    function getAnyExtensionFromPath(path: string, extensions: string | ReadonlyArray<string>, ignoreCase: boolean): string;
-    function isCheckJsEnabledForFile(sourceFile: SourceFile, compilerOptions: CompilerOptions): boolean | undefined;
-    const emptyFileSystemEntries: FileSystemEntries;
-    /**
-     * patternStrings contains both pattern strings (containing "*") and regular strings.
-     * Return an exact match if possible, or a pattern match, or undefined.
-     * (These are verified by verifyCompilerOptions to have 0 or 1 "*" characters.)
-     */
-    function matchPatternOrExact(patternStrings: ReadonlyArray<string>, candidate: string): string | Pattern | undefined;
-}
-declare namespace ts {
-    function createNode(kind: SyntaxKind, pos?: number, end?: number): Node;
-    function isJSDocLikeText(text: string, start: number): boolean;
-    /**
-     * Invokes a callback for each child of the given node. The 'cbNode' callback is invoked for all child nodes
-     * stored in properties. If a 'cbNodes' callback is specified, it is invoked for embedded arrays; otherwise,
-     * embedded arrays are flattened and the 'cbNode' callback is invoked for each element. If a callback returns
-     * a truthy value, iteration stops and that value is returned. Otherwise, undefined is returned.
-     *
-     * @param node a given node to visit its children
-     * @param cbNode a callback to be invoked for all child nodes
-     * @param cbNodes a callback to be invoked for embedded array
-     *
-     * @remarks `forEachChild` must visit the children of a node in the order
-     * that they appear in the source code. The language service depends on this property to locate nodes by position.
-     */
-    function forEachChild<T>(node: Node, cbNode: (node: Node) => T | undefined, cbNodes?: (nodes: NodeArray<Node>) => T | undefined): T | undefined;
-    function createSourceFile(fileName: string, sourceText: string, languageVersion: ScriptTarget, setParentNodes?: boolean, scriptKind?: ScriptKind): SourceFile;
-    function parseIsolatedEntityName(text: string, languageVersion: ScriptTarget): EntityName | undefined;
-    /**
-     * Parse json text into SyntaxTree and return node and parse errors if any
-     * @param fileName
-     * @param sourceText
-     */
-    function parseJsonText(fileName: string, sourceText: string): JsonSourceFile;
-    function isExternalModule(file: SourceFile): boolean;
-    function updateSourceFile(sourceFile: SourceFile, newText: string, textChangeRange: TextChangeRange, aggressiveChecks?: boolean): SourceFile;
-    function parseIsolatedJSDocComment(content: string, start?: number, length?: number): {
-        jsDoc: JSDoc;
-        diagnostics: Diagnostic[];
-    } | undefined;
-    function parseJSDocTypeExpressionForTests(content: string, start?: number, length?: number): {
-        jsDocTypeExpression: JSDocTypeExpression;
-        diagnostics: Diagnostic[];
-    } | undefined;
-    interface PragmaContext {
-        languageVersion: ScriptTarget;
-        pragmas?: PragmaMap;
-        checkJsDirective?: CheckJsDirective;
-        referencedFiles: FileReference[];
-        typeReferenceDirectives: FileReference[];
-        libReferenceDirectives: FileReference[];
-        amdDependencies: AmdDependency[];
-        hasNoDefaultLib?: boolean;
-        moduleName?: string;
-    }
-    function processCommentPragmas(context: PragmaContext, sourceText: string): void;
-    type PragmaDiagnosticReporter = (pos: number, length: number, message: DiagnosticMessage) => void;
-    function processPragmasIntoFields(context: PragmaContext, reportDiagnostic: PragmaDiagnosticReporter): void;
-    /** @internal */
-    function tagNamesAreEquivalent(lhs: JsxTagNameExpression, rhs: JsxTagNameExpression): boolean;
-}
-declare namespace ts {
-    const compileOnSaveCommandLineOption: CommandLineOption;
-    /**
-     * An array of supported "lib" reference file names used to determine the order for inclusion
-     * when referenced, as well as for spelling suggestions. This ensures the correct ordering for
-     * overload resolution when a type declared in one lib is extended by another.
-     */
-    const libs: string[];
-    /**
-     * A map of lib names to lib files. This map is used both for parsing the "lib" command line
-     * option as well as for resolving lib reference directives.
-     */
-    const libMap: Map<string>;
-    const optionDeclarations: CommandLineOption[];
-    const typeAcquisitionDeclarations: CommandLineOption[];
-    interface OptionNameMap {
-        optionNameMap: Map<CommandLineOption>;
-        shortOptionNames: Map<string>;
-    }
-    const defaultInitCompilerOptions: CompilerOptions;
-    function convertEnableAutoDiscoveryToEnable(typeAcquisition: TypeAcquisition): TypeAcquisition;
-    function createCompilerDiagnosticForInvalidCustomType(opt: CommandLineOptionOfCustomType): Diagnostic;
-    function parseCustomTypeOption(opt: CommandLineOptionOfCustomType, value: string, errors: Push<Diagnostic>): string | number | undefined;
-    function parseListTypeOption(opt: CommandLineOptionOfListType, value: string | undefined, errors: Push<Diagnostic>): (string | number)[] | undefined;
-    function parseCommandLine(commandLine: ReadonlyArray<string>, readFile?: (path: string) => string | undefined): ParsedCommandLine;
-    /** @internal */
-    function getOptionFromName(optionName: string, allowShort?: boolean): CommandLineOption | undefined;
-    function printVersion(): void;
-    function printHelp(optionsList: CommandLineOption[], syntaxPrefix?: string): void;
-    type DiagnosticReporter = (diagnostic: Diagnostic) => void;
-    /**
-     * Reports config file diagnostics
-     */
-    interface ConfigFileDiagnosticsReporter {
-        /**
-         * Reports unrecoverable error when parsing config file
-         */
-        onUnRecoverableConfigFileDiagnostic: DiagnosticReporter;
-    }
-    /**
-     * Interface extending ParseConfigHost to support ParseConfigFile that reads config file and reports errors
-     */
-    interface ParseConfigFileHost extends ParseConfigHost, ConfigFileDiagnosticsReporter {
-        getCurrentDirectory(): string;
-    }
-    /**
-     * Reads the config file, reports errors if any and exits if the config file cannot be found
-     */
-    function getParsedCommandLineOfConfigFile(configFileName: string, optionsToExtend: CompilerOptions, host: ParseConfigFileHost): ParsedCommandLine | undefined;
-    /**
-     * Read tsconfig.json file
-     * @param fileName The path to the config file
-     */
-    function readConfigFile(fileName: string, readFile: (path: string) => string | undefined): {
-        config?: any;
-        error?: Diagnostic;
-    };
-    /**
-     * Parse the text of the tsconfig.json file
-     * @param fileName The path to the config file
-     * @param jsonText The text of the config file
-     */
-    function parseConfigFileTextToJson(fileName: string, jsonText: string): {
-        config?: any;
-        error?: Diagnostic;
-    };
-    /**
-     * Read tsconfig.json file
-     * @param fileName The path to the config file
-     */
-    function readJsonConfigFile(fileName: string, readFile: (path: string) => string | undefined): TsConfigSourceFile;
-    interface JsonConversionNotifier {
-        /**
-         * Notifies parent option object is being set with the optionKey and a valid optionValue
-         * Currently it notifies only if there is element with type object (parentOption) and
-         * has element's option declarations map associated with it
-         * @param parentOption parent option name in which the option and value are being set
-         * @param option option declaration which is being set with the value
-         * @param value value of the option
-         */
-        onSetValidOptionKeyValueInParent(parentOption: string, option: CommandLineOption, value: CompilerOptionsValue): void;
-        /**
-         * Notify when valid root key value option is being set
-         * @param key option key
-         * @param keyNode node corresponding to node in the source file
-         * @param value computed value of the key
-         * @param ValueNode node corresponding to value in the source file
-         */
-        onSetValidOptionKeyValueInRoot(key: string, keyNode: PropertyName, value: CompilerOptionsValue, valueNode: Expression): void;
-        /**
-         * Notify when unknown root key value option is being set
-         * @param key option key
-         * @param keyNode node corresponding to node in the source file
-         * @param value computed value of the key
-         * @param ValueNode node corresponding to value in the source file
-         */
-        onSetUnknownOptionKeyValueInRoot(key: string, keyNode: PropertyName, value: CompilerOptionsValue, valueNode: Expression): void;
-    }
-    /**
-     * Convert the json syntax tree into the json value
-     */
-    function convertToObject(sourceFile: JsonSourceFile, errors: Push<Diagnostic>): any;
-    /**
-     * Convert the json syntax tree into the json value and report errors
-     * This returns the json value (apart from checking errors) only if returnValue provided is true.
-     * Otherwise it just checks the errors and returns undefined
-     */
-    function convertToObjectWorker(sourceFile: JsonSourceFile, errors: Push<Diagnostic>, returnValue: boolean, knownRootOptions: CommandLineOption | undefined, jsonConversionNotifier: JsonConversionNotifier | undefined): any;
-    /**
-     * Generate tsconfig configuration when running command line "--init"
-     * @param options commandlineOptions to be generated into tsconfig.json
-     * @param fileNames array of filenames to be generated into tsconfig.json
-     */
-    function generateTSConfig(options: CompilerOptions, fileNames: ReadonlyArray<string>, newLine: string): string;
-    /**
-     * Parse the contents of a config file (tsconfig.json).
-     * @param json The contents of the config file to parse
-     * @param host Instance of ParseConfigHost used to enumerate files in folder.
-     * @param basePath A root directory to resolve relative path entries in the config
-     *    file to. e.g. outDir
-     */
-    function parseJsonConfigFileContent(json: any, host: ParseConfigHost, basePath: string, existingOptions?: CompilerOptions, configFileName?: string, resolutionStack?: Path[], extraFileExtensions?: ReadonlyArray<FileExtensionInfo>): ParsedCommandLine;
-    /**
-     * Parse the contents of a config file (tsconfig.json).
-     * @param jsonNode The contents of the config file to parse
-     * @param host Instance of ParseConfigHost used to enumerate files in folder.
-     * @param basePath A root directory to resolve relative path entries in the config
-     *    file to. e.g. outDir
-     */
-    function parseJsonSourceFileConfigFileContent(sourceFile: TsConfigSourceFile, host: ParseConfigHost, basePath: string, existingOptions?: CompilerOptions, configFileName?: string, resolutionStack?: Path[], extraFileExtensions?: ReadonlyArray<FileExtensionInfo>): ParsedCommandLine;
-    function setConfigFileInOptions(options: CompilerOptions, configFile: TsConfigSourceFile | undefined): void;
-    function isErrorNoInputFiles(error: Diagnostic): boolean;
-    function getErrorForNoInputFiles({ includeSpecs, excludeSpecs }: ConfigFileSpecs, configFileName: string | undefined): Diagnostic;
-    function convertCompilerOptionsFromJson(jsonOptions: any, basePath: string, configFileName?: string): {
-        options: CompilerOptions;
-        errors: Diagnostic[];
-    };
-    function convertTypeAcquisitionFromJson(jsonOptions: any, basePath: string, configFileName?: string): {
-        options: TypeAcquisition;
-        errors: Diagnostic[];
-    };
-    /**
-     * Gets the file names from the provided config file specs that contain, files, include, exclude and
-     * other properties needed to resolve the file names
-     * @param spec The config file specs extracted with file names to include, wildcards to include/exclude and other details
-     * @param basePath The base path for any relative file specifications.
-     * @param options Compiler options.
-     * @param host The host used to resolve files and directories.
-     * @param extraFileExtensions optionaly file extra file extension information from host
-     */
-    function getFileNamesFromConfigSpecs(spec: ConfigFileSpecs, basePath: string, options: CompilerOptions, host: ParseConfigHost, extraFileExtensions?: ReadonlyArray<FileExtensionInfo>): ExpandResult;
-    /**
-     * Produces a cleaned version of compiler options with personally identifiying info (aka, paths) removed.
-     * Also converts enum values back to strings.
-     */
-    function convertCompilerOptionsForTelemetry(opts: CompilerOptions): CompilerOptions;
-}
-declare namespace ts {
-    function trace(host: ModuleResolutionHost, message: DiagnosticMessage, ...args: any[]): void;
-    function isTraceEnabled(compilerOptions: CompilerOptions, host: ModuleResolutionHost): boolean;
-    /** Array that is only intended to be pushed to, never read. */
-    interface Push<T> {
-        push(value: T): void;
-    }
-    function readJson(path: string, host: {
-        readFile(fileName: string): string | undefined;
-    }): object;
-    function getEffectiveTypeRoots(options: CompilerOptions, host: GetEffectiveTypeRootsHost): string[] | undefined;
-    /**
-     * @param {string | undefined} containingFile - file that contains type reference directive, can be undefined if containing file is unknown.
-     * This is possible in case if resolution is performed for directives specified via 'types' parameter. In this case initial path for secondary lookups
-     * is assumed to be the same as root directory of the project.
-     */
-    function resolveTypeReferenceDirective(typeReferenceDirectiveName: string, containingFile: string | undefined, options: CompilerOptions, host: ModuleResolutionHost): ResolvedTypeReferenceDirectiveWithFailedLookupLocations;
-    /**
-     * Given a set of options, returns the set of type directive names
-     *   that should be included for this program automatically.
-     * This list could either come from the config file,
-     *   or from enumerating the types root + initial secondary types lookup location.
-     * More type directives might appear in the program later as a result of loading actual source files;
-     *   this list is only the set of defaults that are implicitly included.
-     */
-    function getAutomaticTypeDirectiveNames(options: CompilerOptions, host: ModuleResolutionHost): string[];
-    /**
-     * Cached module resolutions per containing directory.
-     * This assumes that any module id will have the same resolution for sibling files located in the same folder.
-     */
-    interface ModuleResolutionCache extends NonRelativeModuleNameResolutionCache {
-        getOrCreateCacheForDirectory(directoryName: string): Map<ResolvedModuleWithFailedLookupLocations>;
-    }
-    /**
-     * Stored map from non-relative module name to a table: directory -> result of module lookup in this directory
-     * We support only non-relative module names because resolution of relative module names is usually more deterministic and thus less expensive.
-     */
-    interface NonRelativeModuleNameResolutionCache {
-        getOrCreateCacheForModuleName(nonRelativeModuleName: string): PerModuleNameCache;
-    }
-    interface PerModuleNameCache {
-        get(directory: string): ResolvedModuleWithFailedLookupLocations | undefined;
-        set(directory: string, result: ResolvedModuleWithFailedLookupLocations): void;
-    }
-    function createModuleResolutionCache(currentDirectory: string, getCanonicalFileName: (s: string) => string): ModuleResolutionCache;
-    function createModuleResolutionCacheWithMaps(directoryToModuleNameMap: Map<Map<ResolvedModuleWithFailedLookupLocations>>, moduleNameToDirectoryMap: Map<PerModuleNameCache>, currentDirectory: string, getCanonicalFileName: GetCanonicalFileName): ModuleResolutionCache;
-    function resolveModuleNameFromCache(moduleName: string, containingFile: string, cache: ModuleResolutionCache): ResolvedModuleWithFailedLookupLocations | undefined;
-    function resolveModuleName(moduleName: string, containingFile: string, compilerOptions: CompilerOptions, host: ModuleResolutionHost, cache?: ModuleResolutionCache): ResolvedModuleWithFailedLookupLocations;
-    function nodeModuleNameResolver(moduleName: string, containingFile: string, compilerOptions: CompilerOptions, host: ModuleResolutionHost, cache?: ModuleResolutionCache): ResolvedModuleWithFailedLookupLocations;
-    /**
-     * Expose resolution logic to allow us to use Node module resolution logic from arbitrary locations.
-     * No way to do this with `require()`: https://github.com/nodejs/node/issues/5963
-     * Throws an error if the module can't be resolved.
-     */
-    function resolveJavaScriptModule(moduleName: string, initialDir: string, host: ModuleResolutionHost): string;
-    function directoryProbablyExists(directoryName: string, host: {
-        directoryExists?: (directoryName: string) => boolean;
-    }): boolean;
-    function getPackageName(moduleName: string): {
-        packageName: string;
-        rest: string;
-    };
-    function getTypesPackageName(packageName: string): string;
-    function getMangledNameForScopedPackage(packageName: string): string;
-    function getPackageNameFromAtTypesDirectory(mangledName: string): string;
-    function getUnmangledNameForScopedPackage(typesPackageName: string): string;
-    function classicNameResolver(moduleName: string, containingFile: string, compilerOptions: CompilerOptions, host: ModuleResolutionHost, cache?: NonRelativeModuleNameResolutionCache): ResolvedModuleWithFailedLookupLocations;
-    /**
-     * LSHost may load a module from a global cache of typings.
-     * This is the minumum code needed to expose that functionality; the rest is in LSHost.
-     */
-    function loadModuleFromGlobalCache(moduleName: string, projectName: string | undefined, compilerOptions: CompilerOptions, host: ModuleResolutionHost, globalCache: string): ResolvedModuleWithFailedLookupLocations;
-}
-//# sourceMappingURL=parser.d.ts.map
-declare namespace ts {
-    enum ModuleInstanceState {
-        NonInstantiated = 0,
-        Instantiated = 1,
-        ConstEnumOnly = 2
-    }
-    function getModuleInstanceState(node: ModuleDeclaration): ModuleInstanceState;
-    function bindSourceFile(file: SourceFile, options: CompilerOptions): void;
-    function isExportsOrModuleExportsOrAlias(sourceFile: SourceFile, node: Expression): boolean;
-    /**
-     * Computes the transform flags for a node, given the transform flags of its subtree
-     *
-     * @param node The node to analyze
-     * @param subtreeFlags Transform flags computed for this node's subtree
-     */
-    function computeTransformFlagsForNode(node: Node, subtreeFlags: TransformFlags): TransformFlags;
-    /**
-     * Gets the transform flags to exclude when unioning the transform flags of a subtree.
-     *
-     * NOTE: This needs to be kept up-to-date with the exclusions used in `computeTransformFlagsForNode`.
-     *       For performance reasons, `computeTransformFlagsForNode` uses local constant values rather
-     *       than calling this function.
-     */
-    function getTransformFlagsSubtreeExclusions(kind: SyntaxKind): TransformFlags.OuterExpressionExcludes | TransformFlags.PropertyAccessExcludes | TransformFlags.NodeExcludes | TransformFlags.ArrowFunctionExcludes | TransformFlags.FunctionExcludes | TransformFlags.ConstructorExcludes | TransformFlags.ClassExcludes | TransformFlags.ModuleExcludes | TransformFlags.TypeExcludes | TransformFlags.ObjectLiteralExcludes | TransformFlags.ArrayLiteralOrCallOrNewExcludes | TransformFlags.VariableDeclarationListExcludes | TransformFlags.CatchClauseExcludes;
-}
-/** @internal */
-declare namespace ts {
-    function createGetSymbolWalker(getRestTypeOfSignature: (sig: Signature) => Type, getTypePredicateOfSignature: (sig: Signature) => TypePredicate | undefined, getReturnTypeOfSignature: (sig: Signature) => Type, getBaseTypes: (type: Type) => Type[], resolveStructuredTypeMembers: (type: ObjectType) => ResolvedType, getTypeOfSymbol: (sym: Symbol) => Type, getResolvedSymbol: (node: Node) => Symbol, getIndexTypeOfStructuredType: (type: Type, kind: IndexKind) => Type | undefined, getConstraintFromTypeParameter: (typeParameter: TypeParameter) => Type | undefined, getFirstIdentifier: (node: EntityNameOrEntityNameExpression) => Identifier): (accept?: (symbol: Symbol) => boolean) => SymbolWalker;
-}
-declare namespace ts {
-    function getNodeId(node: Node): number;
-    function getSymbolId(symbol: Symbol): number;
-    function isInstantiatedModule(node: ModuleDeclaration, preserveConstEnums: boolean): boolean;
-    function createTypeChecker(host: TypeCheckerHost, produceDiagnostics: boolean): TypeChecker;
-}
-declare namespace ts {
-    function updateNode<T extends Node>(updated: T, original: T): T;
-    function createNodeArray<T extends Node>(elements?: T[], hasTrailingComma?: boolean): MutableNodeArray<T>;
-    function createNodeArray<T extends Node>(elements?: ReadonlyArray<T>, hasTrailingComma?: boolean): NodeArray<T>;
-    /**
-     * Creates a shallow, memberwise clone of a node with no source map location.
-     */
-    function getSynthesizedClone<T extends Node>(node: T): T;
-    function createLiteral(value: string | StringLiteral | NoSubstitutionTemplateLiteral | NumericLiteral | Identifier, isSingleQuote: boolean): StringLiteral;
-    /** If a node is passed, creates a string literal whose source text is read from a source node during emit. */
-    function createLiteral(value: string | StringLiteral | NoSubstitutionTemplateLiteral | NumericLiteral | Identifier): StringLiteral;
-    function createLiteral(value: number): NumericLiteral;
-    function createLiteral(value: boolean): BooleanLiteral;
-    function createLiteral(value: string | number | boolean): PrimaryExpression;
-    function createNumericLiteral(value: string): NumericLiteral;
-    function createStringLiteral(text: string): StringLiteral;
-    function createRegularExpressionLiteral(text: string): RegularExpressionLiteral;
-    function createIdentifier(text: string): Identifier;
-    function createIdentifier(text: string, typeArguments: ReadonlyArray<TypeNode | TypeParameterDeclaration> | undefined): Identifier;
-    function updateIdentifier(node: Identifier): Identifier;
-    function updateIdentifier(node: Identifier, typeArguments: NodeArray<TypeNode | TypeParameterDeclaration> | undefined): Identifier;
-    /** Create a unique temporary variable. */
-    function createTempVariable(recordTempVariable: ((node: Identifier) => void) | undefined): Identifier;
-    function createTempVariable(recordTempVariable: ((node: Identifier) => void) | undefined, reservedInNestedScopes: boolean): GeneratedIdentifier;
-    /** Create a unique temporary variable for use in a loop. */
-    function createLoopVariable(): Identifier;
-    /** Create a unique name based on the supplied text. */
-    function createUniqueName(text: string): Identifier;
-    function createOptimisticUniqueName(text: string): GeneratedIdentifier;
-    /** Create a unique name based on the supplied text. */
-    function createOptimisticUniqueName(text: string): Identifier;
-    /** Create a unique name based on the supplied text. This does not consider names injected by the transformer. */
-    function createFileLevelUniqueName(text: string): Identifier;
-    /** Create a unique name generated for a node. */
-    function getGeneratedNameForNode(node: Node): Identifier;
-    function getGeneratedNameForNode(node: Node, flags: GeneratedIdentifierFlags): Identifier;
-    function createToken<TKind extends SyntaxKind>(token: TKind): Token<TKind>;
-    function createSuper(): SuperExpression;
-    function createThis(): ThisExpression & Token<SyntaxKind.ThisKeyword>;
-    function createNull(): NullLiteral & Token<SyntaxKind.NullKeyword>;
-    function createTrue(): BooleanLiteral & Token<SyntaxKind.TrueKeyword>;
-    function createFalse(): BooleanLiteral & Token<SyntaxKind.FalseKeyword>;
-    function createModifier<T extends Modifier["kind"]>(kind: T): Token<T>;
-    function createModifiersFromModifierFlags(flags: ModifierFlags): Modifier[];
-    function createQualifiedName(left: EntityName, right: string | Identifier): QualifiedName;
-    function updateQualifiedName(node: QualifiedName, left: EntityName, right: Identifier): QualifiedName;
-    function createComputedPropertyName(expression: Expression): ComputedPropertyName;
-    function updateComputedPropertyName(node: ComputedPropertyName, expression: Expression): ComputedPropertyName;
-    function createTypeParameterDeclaration(name: string | Identifier, constraint?: TypeNode, defaultType?: TypeNode): TypeParameterDeclaration;
-    function updateTypeParameterDeclaration(node: TypeParameterDeclaration, name: Identifier, constraint: TypeNode | undefined, defaultType: TypeNode | undefined): TypeParameterDeclaration;
-    function createParameter(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, dotDotDotToken: DotDotDotToken | undefined, name: string | BindingName, questionToken?: QuestionToken, type?: TypeNode, initializer?: Expression): ParameterDeclaration;
-    function updateParameter(node: ParameterDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, dotDotDotToken: DotDotDotToken | undefined, name: string | BindingName, questionToken: QuestionToken | undefined, type: TypeNode | undefined, initializer: Expression | undefined): ParameterDeclaration;
-    function createDecorator(expression: Expression): Decorator;
-    function updateDecorator(node: Decorator, expression: Expression): Decorator;
-    function createPropertySignature(modifiers: ReadonlyArray<Modifier> | undefined, name: PropertyName | string, questionToken: QuestionToken | undefined, type: TypeNode | undefined, initializer: Expression | undefined): PropertySignature;
-    function updatePropertySignature(node: PropertySignature, modifiers: ReadonlyArray<Modifier> | undefined, name: PropertyName, questionToken: QuestionToken | undefined, type: TypeNode | undefined, initializer: Expression | undefined): PropertySignature;
-    function createProperty(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | PropertyName, questionOrExclamationToken: QuestionToken | ExclamationToken | undefined, type: TypeNode | undefined, initializer: Expression | undefined): PropertyDeclaration;
-    function updateProperty(node: PropertyDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | PropertyName, questionOrExclamationToken: QuestionToken | ExclamationToken | undefined, type: TypeNode | undefined, initializer: Expression | undefined): PropertyDeclaration;
-    function createMethodSignature(typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, name: string | PropertyName, questionToken: QuestionToken | undefined): MethodSignature;
-    function updateMethodSignature(node: MethodSignature, typeParameters: NodeArray<TypeParameterDeclaration> | undefined, parameters: NodeArray<ParameterDeclaration>, type: TypeNode | undefined, name: PropertyName, questionToken: QuestionToken | undefined): MethodSignature;
-    function createMethod(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, asteriskToken: AsteriskToken | undefined, name: string | PropertyName, questionToken: QuestionToken | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, body: Block | undefined): MethodDeclaration;
-    function updateMethod(node: MethodDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, asteriskToken: AsteriskToken | undefined, name: PropertyName, questionToken: QuestionToken | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, body: Block | undefined): MethodDeclaration;
-    function createConstructor(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, body: Block | undefined): ConstructorDeclaration;
-    function updateConstructor(node: ConstructorDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, body: Block | undefined): ConstructorDeclaration;
-    function createGetAccessor(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | PropertyName, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, body: Block | undefined): GetAccessorDeclaration;
-    function updateGetAccessor(node: GetAccessorDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: PropertyName, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, body: Block | undefined): GetAccessorDeclaration;
-    function createSetAccessor(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | PropertyName, parameters: ReadonlyArray<ParameterDeclaration>, body: Block | undefined): SetAccessorDeclaration;
-    function updateSetAccessor(node: SetAccessorDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: PropertyName, parameters: ReadonlyArray<ParameterDeclaration>, body: Block | undefined): SetAccessorDeclaration;
-    function createCallSignature(typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined): CallSignatureDeclaration;
-    function updateCallSignature(node: CallSignatureDeclaration, typeParameters: NodeArray<TypeParameterDeclaration> | undefined, parameters: NodeArray<ParameterDeclaration>, type: TypeNode | undefined): CallSignatureDeclaration;
-    function createConstructSignature(typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined): ConstructSignatureDeclaration;
-    function updateConstructSignature(node: ConstructSignatureDeclaration, typeParameters: NodeArray<TypeParameterDeclaration> | undefined, parameters: NodeArray<ParameterDeclaration>, type: TypeNode | undefined): ConstructSignatureDeclaration;
-    function createIndexSignature(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode): IndexSignatureDeclaration;
-    function updateIndexSignature(node: IndexSignatureDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode): IndexSignatureDeclaration;
-    function createSignatureDeclaration(kind: SyntaxKind, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, typeArguments?: ReadonlyArray<TypeNode> | undefined): SignatureDeclaration;
-    function createKeywordTypeNode(kind: KeywordTypeNode["kind"]): KeywordTypeNode;
-    function createTypePredicateNode(parameterName: Identifier | ThisTypeNode | string, type: TypeNode): TypePredicateNode;
-    function updateTypePredicateNode(node: TypePredicateNode, parameterName: Identifier | ThisTypeNode, type: TypeNode): TypePredicateNode;
-    function createTypeReferenceNode(typeName: string | EntityName, typeArguments: ReadonlyArray<TypeNode> | undefined): TypeReferenceNode;
-    function updateTypeReferenceNode(node: TypeReferenceNode, typeName: EntityName, typeArguments: NodeArray<TypeNode> | undefined): TypeReferenceNode;
-    function createFunctionTypeNode(typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined): FunctionTypeNode;
-    function updateFunctionTypeNode(node: FunctionTypeNode, typeParameters: NodeArray<TypeParameterDeclaration> | undefined, parameters: NodeArray<ParameterDeclaration>, type: TypeNode | undefined): FunctionTypeNode;
-    function createConstructorTypeNode(typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined): ConstructorTypeNode;
-    function updateConstructorTypeNode(node: ConstructorTypeNode, typeParameters: NodeArray<TypeParameterDeclaration> | undefined, parameters: NodeArray<ParameterDeclaration>, type: TypeNode | undefined): ConstructorTypeNode;
-    function createTypeQueryNode(exprName: EntityName): TypeQueryNode;
-    function updateTypeQueryNode(node: TypeQueryNode, exprName: EntityName): TypeQueryNode;
-    function createTypeLiteralNode(members: ReadonlyArray<TypeElement> | undefined): TypeLiteralNode;
-    function updateTypeLiteralNode(node: TypeLiteralNode, members: NodeArray<TypeElement>): TypeLiteralNode;
-    function createArrayTypeNode(elementType: TypeNode): ArrayTypeNode;
-    function updateArrayTypeNode(node: ArrayTypeNode, elementType: TypeNode): ArrayTypeNode;
-    function createTupleTypeNode(elementTypes: ReadonlyArray<TypeNode>): TupleTypeNode;
-    function updateTypleTypeNode(node: TupleTypeNode, elementTypes: ReadonlyArray<TypeNode>): TupleTypeNode;
-    function createUnionTypeNode(types: ReadonlyArray<TypeNode>): UnionTypeNode;
-    function updateUnionTypeNode(node: UnionTypeNode, types: NodeArray<TypeNode>): UnionTypeNode;
-    function createIntersectionTypeNode(types: ReadonlyArray<TypeNode>): IntersectionTypeNode;
-    function updateIntersectionTypeNode(node: IntersectionTypeNode, types: NodeArray<TypeNode>): IntersectionTypeNode;
-    function createUnionOrIntersectionTypeNode(kind: SyntaxKind.UnionType | SyntaxKind.IntersectionType, types: ReadonlyArray<TypeNode>): UnionTypeNode | IntersectionTypeNode;
-    function createConditionalTypeNode(checkType: TypeNode, extendsType: TypeNode, trueType: TypeNode, falseType: TypeNode): ConditionalTypeNode;
-    function updateConditionalTypeNode(node: ConditionalTypeNode, checkType: TypeNode, extendsType: TypeNode, trueType: TypeNode, falseType: TypeNode): ConditionalTypeNode;
-    function createInferTypeNode(typeParameter: TypeParameterDeclaration): InferTypeNode;
-    function updateInferTypeNode(node: InferTypeNode, typeParameter: TypeParameterDeclaration): InferTypeNode;
-    function createImportTypeNode(argument: TypeNode, qualifier?: EntityName, typeArguments?: ReadonlyArray<TypeNode>, isTypeOf?: boolean): ImportTypeNode;
-    function updateImportTypeNode(node: ImportTypeNode, argument: TypeNode, qualifier?: EntityName, typeArguments?: ReadonlyArray<TypeNode>, isTypeOf?: boolean): ImportTypeNode;
-    function createParenthesizedType(type: TypeNode): ParenthesizedTypeNode;
-    function updateParenthesizedType(node: ParenthesizedTypeNode, type: TypeNode): ParenthesizedTypeNode;
-    function createThisTypeNode(): ThisTypeNode;
-    function createTypeOperatorNode(type: TypeNode): TypeOperatorNode;
-    function createTypeOperatorNode(operator: SyntaxKind.KeyOfKeyword | SyntaxKind.UniqueKeyword, type: TypeNode): TypeOperatorNode;
-    function updateTypeOperatorNode(node: TypeOperatorNode, type: TypeNode): TypeOperatorNode;
-    function createIndexedAccessTypeNode(objectType: TypeNode, indexType: TypeNode): IndexedAccessTypeNode;
-    function updateIndexedAccessTypeNode(node: IndexedAccessTypeNode, objectType: TypeNode, indexType: TypeNode): IndexedAccessTypeNode;
-    function createMappedTypeNode(readonlyToken: ReadonlyToken | PlusToken | MinusToken | undefined, typeParameter: TypeParameterDeclaration, questionToken: QuestionToken | PlusToken | MinusToken | undefined, type: TypeNode | undefined): MappedTypeNode;
-    function updateMappedTypeNode(node: MappedTypeNode, readonlyToken: ReadonlyToken | PlusToken | MinusToken | undefined, typeParameter: TypeParameterDeclaration, questionToken: QuestionToken | PlusToken | MinusToken | undefined, type: TypeNode | undefined): MappedTypeNode;
-    function createLiteralTypeNode(literal: LiteralTypeNode["literal"]): LiteralTypeNode;
-    function updateLiteralTypeNode(node: LiteralTypeNode, literal: LiteralTypeNode["literal"]): LiteralTypeNode;
-    function createObjectBindingPattern(elements: ReadonlyArray<BindingElement>): ObjectBindingPattern;
-    function updateObjectBindingPattern(node: ObjectBindingPattern, elements: ReadonlyArray<BindingElement>): ObjectBindingPattern;
-    function createArrayBindingPattern(elements: ReadonlyArray<ArrayBindingElement>): ArrayBindingPattern;
-    function updateArrayBindingPattern(node: ArrayBindingPattern, elements: ReadonlyArray<ArrayBindingElement>): ArrayBindingPattern;
-    function createBindingElement(dotDotDotToken: DotDotDotToken | undefined, propertyName: string | PropertyName | undefined, name: string | BindingName, initializer?: Expression): BindingElement;
-    function updateBindingElement(node: BindingElement, dotDotDotToken: DotDotDotToken | undefined, propertyName: PropertyName | undefined, name: BindingName, initializer: Expression | undefined): BindingElement;
-    function createArrayLiteral(elements?: ReadonlyArray<Expression>, multiLine?: boolean): ArrayLiteralExpression;
-    function updateArrayLiteral(node: ArrayLiteralExpression, elements: ReadonlyArray<Expression>): ArrayLiteralExpression;
-    function createObjectLiteral(properties?: ReadonlyArray<ObjectLiteralElementLike>, multiLine?: boolean): ObjectLiteralExpression;
-    function updateObjectLiteral(node: ObjectLiteralExpression, properties: ReadonlyArray<ObjectLiteralElementLike>): ObjectLiteralExpression;
-    function createPropertyAccess(expression: Expression, name: string | Identifier | undefined): PropertyAccessExpression;
-    function updatePropertyAccess(node: PropertyAccessExpression, expression: Expression, name: Identifier): PropertyAccessExpression;
-    function createElementAccess(expression: Expression, index: number | Expression): ElementAccessExpression;
-    function updateElementAccess(node: ElementAccessExpression, expression: Expression, argumentExpression: Expression): ElementAccessExpression;
-    function createCall(expression: Expression, typeArguments: ReadonlyArray<TypeNode> | undefined, argumentsArray: ReadonlyArray<Expression> | undefined): CallExpression;
-    function updateCall(node: CallExpression, expression: Expression, typeArguments: ReadonlyArray<TypeNode> | undefined, argumentsArray: ReadonlyArray<Expression>): CallExpression;
-    function createNew(expression: Expression, typeArguments: ReadonlyArray<TypeNode> | undefined, argumentsArray: ReadonlyArray<Expression> | undefined): NewExpression;
-    function updateNew(node: NewExpression, expression: Expression, typeArguments: ReadonlyArray<TypeNode> | undefined, argumentsArray: ReadonlyArray<Expression> | undefined): NewExpression;
-    function createTaggedTemplate(tag: Expression, template: TemplateLiteral): TaggedTemplateExpression;
-    function createTaggedTemplate(tag: Expression, typeArguments: ReadonlyArray<TypeNode> | undefined, template: TemplateLiteral): TaggedTemplateExpression;
-    /** @internal */
-    function createTaggedTemplate(tag: Expression, typeArgumentsOrTemplate: ReadonlyArray<TypeNode> | TemplateLiteral | undefined, template?: TemplateLiteral): TaggedTemplateExpression;
-    function updateTaggedTemplate(node: TaggedTemplateExpression, tag: Expression, template: TemplateLiteral): TaggedTemplateExpression;
-    function updateTaggedTemplate(node: TaggedTemplateExpression, tag: Expression, typeArguments: ReadonlyArray<TypeNode> | undefined, template: TemplateLiteral): TaggedTemplateExpression;
-    function createTypeAssertion(type: TypeNode, expression: Expression): TypeAssertion;
-    function updateTypeAssertion(node: TypeAssertion, type: TypeNode, expression: Expression): TypeAssertion;
-    function createParen(expression: Expression): ParenthesizedExpression;
-    function updateParen(node: ParenthesizedExpression, expression: Expression): ParenthesizedExpression;
-    function createFunctionExpression(modifiers: ReadonlyArray<Modifier> | undefined, asteriskToken: AsteriskToken | undefined, name: string | Identifier | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration> | undefined, type: TypeNode | undefined, body: Block): FunctionExpression;
-    function updateFunctionExpression(node: FunctionExpression, modifiers: ReadonlyArray<Modifier> | undefined, asteriskToken: AsteriskToken | undefined, name: Identifier | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, body: Block): FunctionExpression;
-    function createArrowFunction(modifiers: ReadonlyArray<Modifier> | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, equalsGreaterThanToken: EqualsGreaterThanToken | undefined, body: ConciseBody): ArrowFunction;
-    function updateArrowFunction(node: ArrowFunction, modifiers: ReadonlyArray<Modifier> | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, body: ConciseBody): ArrowFunction;
-    function updateArrowFunction(node: ArrowFunction, modifiers: ReadonlyArray<Modifier> | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, equalsGreaterThanToken: Token<SyntaxKind.EqualsGreaterThanToken>, body: ConciseBody): ArrowFunction;
-    function createDelete(expression: Expression): DeleteExpression;
-    function updateDelete(node: DeleteExpression, expression: Expression): DeleteExpression;
-    function createTypeOf(expression: Expression): TypeOfExpression;
-    function updateTypeOf(node: TypeOfExpression, expression: Expression): TypeOfExpression;
-    function createVoid(expression: Expression): VoidExpression;
-    function updateVoid(node: VoidExpression, expression: Expression): VoidExpression;
-    function createAwait(expression: Expression): AwaitExpression;
-    function updateAwait(node: AwaitExpression, expression: Expression): AwaitExpression;
-    function createPrefix(operator: PrefixUnaryOperator, operand: Expression): PrefixUnaryExpression;
-    function updatePrefix(node: PrefixUnaryExpression, operand: Expression): PrefixUnaryExpression;
-    function createPostfix(operand: Expression, operator: PostfixUnaryOperator): PostfixUnaryExpression;
-    function updatePostfix(node: PostfixUnaryExpression, operand: Expression): PostfixUnaryExpression;
-    function createBinary(left: Expression, operator: BinaryOperator | BinaryOperatorToken, right: Expression): BinaryExpression;
-    function updateBinary(node: BinaryExpression, left: Expression, right: Expression, operator?: BinaryOperator | BinaryOperatorToken): BinaryExpression;
-    function createConditional(condition: Expression, whenTrue: Expression, whenFalse: Expression): ConditionalExpression;
-    function createConditional(condition: Expression, questionToken: QuestionToken, whenTrue: Expression, colonToken: ColonToken, whenFalse: Expression): ConditionalExpression;
-    function updateConditional(node: ConditionalExpression, condition: Expression, whenTrue: Expression, whenFalse: Expression): ConditionalExpression;
-    function updateConditional(node: ConditionalExpression, condition: Expression, questionToken: Token<SyntaxKind.QuestionToken>, whenTrue: Expression, colonToken: Token<SyntaxKind.ColonToken>, whenFalse: Expression): ConditionalExpression;
-    function createTemplateExpression(head: TemplateHead, templateSpans: ReadonlyArray<TemplateSpan>): TemplateExpression;
-    function updateTemplateExpression(node: TemplateExpression, head: TemplateHead, templateSpans: ReadonlyArray<TemplateSpan>): TemplateExpression;
-    function createTemplateHead(text: string): TemplateHead;
-    function createTemplateMiddle(text: string): TemplateMiddle;
-    function createTemplateTail(text: string): TemplateTail;
-    function createNoSubstitutionTemplateLiteral(text: string): NoSubstitutionTemplateLiteral;
-    function createYield(expression?: Expression): YieldExpression;
-    function createYield(asteriskToken: AsteriskToken | undefined, expression: Expression): YieldExpression;
-    function updateYield(node: YieldExpression, asteriskToken: AsteriskToken | undefined, expression: Expression): YieldExpression;
-    function createSpread(expression: Expression): SpreadElement;
-    function updateSpread(node: SpreadElement, expression: Expression): SpreadElement;
-    function createClassExpression(modifiers: ReadonlyArray<Modifier> | undefined, name: string | Identifier | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, heritageClauses: ReadonlyArray<HeritageClause> | undefined, members: ReadonlyArray<ClassElement>): ClassExpression;
-    function updateClassExpression(node: ClassExpression, modifiers: ReadonlyArray<Modifier> | undefined, name: Identifier | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, heritageClauses: ReadonlyArray<HeritageClause> | undefined, members: ReadonlyArray<ClassElement>): ClassExpression;
-    function createOmittedExpression(): OmittedExpression;
-    function createExpressionWithTypeArguments(typeArguments: ReadonlyArray<TypeNode> | undefined, expression: Expression): ExpressionWithTypeArguments;
-    function updateExpressionWithTypeArguments(node: ExpressionWithTypeArguments, typeArguments: ReadonlyArray<TypeNode> | undefined, expression: Expression): ExpressionWithTypeArguments;
-    function createAsExpression(expression: Expression, type: TypeNode): AsExpression;
-    function updateAsExpression(node: AsExpression, expression: Expression, type: TypeNode): AsExpression;
-    function createNonNullExpression(expression: Expression): NonNullExpression;
-    function updateNonNullExpression(node: NonNullExpression, expression: Expression): NonNullExpression;
-    function createMetaProperty(keywordToken: MetaProperty["keywordToken"], name: Identifier): MetaProperty;
-    function updateMetaProperty(node: MetaProperty, name: Identifier): MetaProperty;
-    function createTemplateSpan(expression: Expression, literal: TemplateMiddle | TemplateTail): TemplateSpan;
-    function updateTemplateSpan(node: TemplateSpan, expression: Expression, literal: TemplateMiddle | TemplateTail): TemplateSpan;
-    function createSemicolonClassElement(): SemicolonClassElement;
-    function createBlock(statements: ReadonlyArray<Statement>, multiLine?: boolean): Block;
-    function createExpressionStatement(expression: Expression): ExpressionStatement;
-    function updateBlock(node: Block, statements: ReadonlyArray<Statement>): Block;
-    function createVariableStatement(modifiers: ReadonlyArray<Modifier> | undefined, declarationList: VariableDeclarationList | ReadonlyArray<VariableDeclaration>): VariableStatement;
-    function updateVariableStatement(node: VariableStatement, modifiers: ReadonlyArray<Modifier> | undefined, declarationList: VariableDeclarationList): VariableStatement;
-    function createEmptyStatement(): EmptyStatement;
-    function createStatement(expression: Expression): ExpressionStatement;
-    function updateStatement(node: ExpressionStatement, expression: Expression): ExpressionStatement;
-    function createIf(expression: Expression, thenStatement: Statement, elseStatement?: Statement): IfStatement;
-    function updateIf(node: IfStatement, expression: Expression, thenStatement: Statement, elseStatement: Statement | undefined): IfStatement;
-    function createDo(statement: Statement, expression: Expression): DoStatement;
-    function updateDo(node: DoStatement, statement: Statement, expression: Expression): DoStatement;
-    function createWhile(expression: Expression, statement: Statement): WhileStatement;
-    function updateWhile(node: WhileStatement, expression: Expression, statement: Statement): WhileStatement;
-    function createFor(initializer: ForInitializer | undefined, condition: Expression | undefined, incrementor: Expression | undefined, statement: Statement): ForStatement;
-    function updateFor(node: ForStatement, initializer: ForInitializer | undefined, condition: Expression | undefined, incrementor: Expression | undefined, statement: Statement): ForStatement;
-    function createForIn(initializer: ForInitializer, expression: Expression, statement: Statement): ForInStatement;
-    function updateForIn(node: ForInStatement, initializer: ForInitializer, expression: Expression, statement: Statement): ForInStatement;
-    function createForOf(awaitModifier: AwaitKeywordToken | undefined, initializer: ForInitializer, expression: Expression, statement: Statement): ForOfStatement;
-    function updateForOf(node: ForOfStatement, awaitModifier: AwaitKeywordToken | undefined, initializer: ForInitializer, expression: Expression, statement: Statement): ForOfStatement;
-    function createContinue(label?: string | Identifier): ContinueStatement;
-    function updateContinue(node: ContinueStatement, label: Identifier | undefined): ContinueStatement;
-    function createBreak(label?: string | Identifier): BreakStatement;
-    function updateBreak(node: BreakStatement, label: Identifier | undefined): BreakStatement;
-    function createReturn(expression?: Expression): ReturnStatement;
-    function updateReturn(node: ReturnStatement, expression: Expression | undefined): ReturnStatement;
-    function createWith(expression: Expression, statement: Statement): WithStatement;
-    function updateWith(node: WithStatement, expression: Expression, statement: Statement): WithStatement;
-    function createSwitch(expression: Expression, caseBlock: CaseBlock): SwitchStatement;
-    function updateSwitch(node: SwitchStatement, expression: Expression, caseBlock: CaseBlock): SwitchStatement;
-    function createLabel(label: string | Identifier, statement: Statement): LabeledStatement;
-    function updateLabel(node: LabeledStatement, label: Identifier, statement: Statement): LabeledStatement;
-    function createThrow(expression: Expression): ThrowStatement;
-    function updateThrow(node: ThrowStatement, expression: Expression): ThrowStatement;
-    function createTry(tryBlock: Block, catchClause: CatchClause | undefined, finallyBlock: Block | undefined): TryStatement;
-    function updateTry(node: TryStatement, tryBlock: Block, catchClause: CatchClause | undefined, finallyBlock: Block | undefined): TryStatement;
-    function createDebuggerStatement(): DebuggerStatement;
-    function createVariableDeclaration(name: string | BindingName, type?: TypeNode, initializer?: Expression): VariableDeclaration;
-    function updateVariableDeclaration(node: VariableDeclaration, name: BindingName, type: TypeNode | undefined, initializer: Expression | undefined): VariableDeclaration;
-    function createVariableDeclarationList(declarations: ReadonlyArray<VariableDeclaration>, flags?: NodeFlags): VariableDeclarationList;
-    function updateVariableDeclarationList(node: VariableDeclarationList, declarations: ReadonlyArray<VariableDeclaration>): VariableDeclarationList;
-    function createFunctionDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, asteriskToken: AsteriskToken | undefined, name: string | Identifier | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, body: Block | undefined): FunctionDeclaration;
-    function updateFunctionDeclaration(node: FunctionDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, asteriskToken: AsteriskToken | undefined, name: Identifier | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, body: Block | undefined): FunctionDeclaration;
-    function createClassDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | Identifier | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, heritageClauses: ReadonlyArray<HeritageClause> | undefined, members: ReadonlyArray<ClassElement>): ClassDeclaration;
-    function updateClassDeclaration(node: ClassDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: Identifier | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, heritageClauses: ReadonlyArray<HeritageClause> | undefined, members: ReadonlyArray<ClassElement>): ClassDeclaration;
-    function createInterfaceDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | Identifier, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, heritageClauses: ReadonlyArray<HeritageClause> | undefined, members: ReadonlyArray<TypeElement>): InterfaceDeclaration;
-    function updateInterfaceDeclaration(node: InterfaceDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: Identifier, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, heritageClauses: ReadonlyArray<HeritageClause> | undefined, members: ReadonlyArray<TypeElement>): InterfaceDeclaration;
-    function createTypeAliasDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | Identifier, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, type: TypeNode): TypeAliasDeclaration;
-    function updateTypeAliasDeclaration(node: TypeAliasDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: Identifier, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, type: TypeNode): TypeAliasDeclaration;
-    function createEnumDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | Identifier, members: ReadonlyArray<EnumMember>): EnumDeclaration;
-    function updateEnumDeclaration(node: EnumDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: Identifier, members: ReadonlyArray<EnumMember>): EnumDeclaration;
-    function createModuleDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: ModuleName, body: ModuleBody | undefined, flags?: NodeFlags): ModuleDeclaration;
-    function updateModuleDeclaration(node: ModuleDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: ModuleName, body: ModuleBody | undefined): ModuleDeclaration;
-    function createModuleBlock(statements: ReadonlyArray<Statement>): ModuleBlock;
-    function updateModuleBlock(node: ModuleBlock, statements: ReadonlyArray<Statement>): ModuleBlock;
-    function createCaseBlock(clauses: ReadonlyArray<CaseOrDefaultClause>): CaseBlock;
-    function updateCaseBlock(node: CaseBlock, clauses: ReadonlyArray<CaseOrDefaultClause>): CaseBlock;
-    function createNamespaceExportDeclaration(name: string | Identifier): NamespaceExportDeclaration;
-    function updateNamespaceExportDeclaration(node: NamespaceExportDeclaration, name: Identifier): NamespaceExportDeclaration;
-    function createImportEqualsDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | Identifier, moduleReference: ModuleReference): ImportEqualsDeclaration;
-    function updateImportEqualsDeclaration(node: ImportEqualsDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: Identifier, moduleReference: ModuleReference): ImportEqualsDeclaration;
-    function createImportDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, importClause: ImportClause | undefined, moduleSpecifier: Expression): ImportDeclaration;
-    function updateImportDeclaration(node: ImportDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, importClause: ImportClause | undefined, moduleSpecifier: Expression): ImportDeclaration;
-    function createImportClause(name: Identifier | undefined, namedBindings: NamedImportBindings | undefined): ImportClause;
-    function updateImportClause(node: ImportClause, name: Identifier | undefined, namedBindings: NamedImportBindings | undefined): ImportClause;
-    function createNamespaceImport(name: Identifier): NamespaceImport;
-    function updateNamespaceImport(node: NamespaceImport, name: Identifier): NamespaceImport;
-    function createNamedImports(elements: ReadonlyArray<ImportSpecifier>): NamedImports;
-    function updateNamedImports(node: NamedImports, elements: ReadonlyArray<ImportSpecifier>): NamedImports;
-    function createImportSpecifier(propertyName: Identifier | undefined, name: Identifier): ImportSpecifier;
-    function updateImportSpecifier(node: ImportSpecifier, propertyName: Identifier | undefined, name: Identifier): ImportSpecifier;
-    function createExportAssignment(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, isExportEquals: boolean | undefined, expression: Expression): ExportAssignment;
-    function updateExportAssignment(node: ExportAssignment, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, expression: Expression): ExportAssignment;
-    function createExportDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, exportClause: NamedExports | undefined, moduleSpecifier?: Expression): ExportDeclaration;
-    function updateExportDeclaration(node: ExportDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, exportClause: NamedExports | undefined, moduleSpecifier: Expression | undefined): ExportDeclaration;
-    function createNamedExports(elements: ReadonlyArray<ExportSpecifier>): NamedExports;
-    function updateNamedExports(node: NamedExports, elements: ReadonlyArray<ExportSpecifier>): NamedExports;
-    function createExportSpecifier(propertyName: string | Identifier | undefined, name: string | Identifier): ExportSpecifier;
-    function updateExportSpecifier(node: ExportSpecifier, propertyName: Identifier | undefined, name: Identifier): ExportSpecifier;
-    function createExternalModuleReference(expression: Expression): ExternalModuleReference;
-    function updateExternalModuleReference(node: ExternalModuleReference, expression: Expression): ExternalModuleReference;
-    function createJsxElement(openingElement: JsxOpeningElement, children: ReadonlyArray<JsxChild>, closingElement: JsxClosingElement): JsxElement;
-    function updateJsxElement(node: JsxElement, openingElement: JsxOpeningElement, children: ReadonlyArray<JsxChild>, closingElement: JsxClosingElement): JsxElement;
-    function createJsxSelfClosingElement(tagName: JsxTagNameExpression, typeArguments: ReadonlyArray<TypeNode> | undefined, attributes: JsxAttributes): JsxSelfClosingElement;
-    function updateJsxSelfClosingElement(node: JsxSelfClosingElement, tagName: JsxTagNameExpression, typeArguments: ReadonlyArray<TypeNode> | undefined, attributes: JsxAttributes): JsxSelfClosingElement;
-    function createJsxOpeningElement(tagName: JsxTagNameExpression, typeArguments: ReadonlyArray<TypeNode> | undefined, attributes: JsxAttributes): JsxOpeningElement;
-    function updateJsxOpeningElement(node: JsxOpeningElement, tagName: JsxTagNameExpression, typeArguments: ReadonlyArray<TypeNode> | undefined, attributes: JsxAttributes): JsxOpeningElement;
-    function createJsxClosingElement(tagName: JsxTagNameExpression): JsxClosingElement;
-    function updateJsxClosingElement(node: JsxClosingElement, tagName: JsxTagNameExpression): JsxClosingElement;
-    function createJsxFragment(openingFragment: JsxOpeningFragment, children: ReadonlyArray<JsxChild>, closingFragment: JsxClosingFragment): JsxFragment;
-    function updateJsxFragment(node: JsxFragment, openingFragment: JsxOpeningFragment, children: ReadonlyArray<JsxChild>, closingFragment: JsxClosingFragment): JsxFragment;
-    function createJsxAttribute(name: Identifier, initializer: StringLiteral | JsxExpression): JsxAttribute;
-    function updateJsxAttribute(node: JsxAttribute, name: Identifier, initializer: StringLiteral | JsxExpression): JsxAttribute;
-    function createJsxAttributes(properties: ReadonlyArray<JsxAttributeLike>): JsxAttributes;
-    function updateJsxAttributes(node: JsxAttributes, properties: ReadonlyArray<JsxAttributeLike>): JsxAttributes;
-    function createJsxSpreadAttribute(expression: Expression): JsxSpreadAttribute;
-    function updateJsxSpreadAttribute(node: JsxSpreadAttribute, expression: Expression): JsxSpreadAttribute;
-    function createJsxExpression(dotDotDotToken: DotDotDotToken | undefined, expression: Expression | undefined): JsxExpression;
-    function updateJsxExpression(node: JsxExpression, expression: Expression | undefined): JsxExpression;
-    function createCaseClause(expression: Expression, statements: ReadonlyArray<Statement>): CaseClause;
-    function updateCaseClause(node: CaseClause, expression: Expression, statements: ReadonlyArray<Statement>): CaseClause;
-    function createDefaultClause(statements: ReadonlyArray<Statement>): DefaultClause;
-    function updateDefaultClause(node: DefaultClause, statements: ReadonlyArray<Statement>): DefaultClause;
-    function createHeritageClause(token: HeritageClause["token"], types: ReadonlyArray<ExpressionWithTypeArguments>): HeritageClause;
-    function updateHeritageClause(node: HeritageClause, types: ReadonlyArray<ExpressionWithTypeArguments>): HeritageClause;
-    function createCatchClause(variableDeclaration: string | VariableDeclaration | undefined, block: Block): CatchClause;
-    function updateCatchClause(node: CatchClause, variableDeclaration: VariableDeclaration | undefined, block: Block): CatchClause;
-    function createPropertyAssignment(name: string | PropertyName, initializer: Expression): PropertyAssignment;
-    function updatePropertyAssignment(node: PropertyAssignment, name: PropertyName, initializer: Expression): PropertyAssignment;
-    function createShorthandPropertyAssignment(name: string | Identifier, objectAssignmentInitializer?: Expression): ShorthandPropertyAssignment;
-    function updateShorthandPropertyAssignment(node: ShorthandPropertyAssignment, name: Identifier, objectAssignmentInitializer: Expression | undefined): ShorthandPropertyAssignment;
-    function createSpreadAssignment(expression: Expression): SpreadAssignment;
-    function updateSpreadAssignment(node: SpreadAssignment, expression: Expression): SpreadAssignment;
-    function createEnumMember(name: string | PropertyName, initializer?: Expression): EnumMember;
-    function updateEnumMember(node: EnumMember, name: PropertyName, initializer: Expression | undefined): EnumMember;
-    function updateSourceFileNode(node: SourceFile, statements: ReadonlyArray<Statement>, isDeclarationFile?: boolean, referencedFiles?: SourceFile["referencedFiles"], typeReferences?: SourceFile["typeReferenceDirectives"], hasNoDefaultLib?: boolean, libReferences?: SourceFile["libReferenceDirectives"]): SourceFile;
-    /**
-     * Creates a shallow, memberwise clone of a node for mutation.
-     */
-    function getMutableClone<T extends Node>(node: T): T;
-    /**
-     * Creates a synthetic statement to act as a placeholder for a not-emitted statement in
-     * order to preserve comments.
-     *
-     * @param original The original statement.
-     */
-    function createNotEmittedStatement(original: Node): NotEmittedStatement;
-    /**
-     * Creates a synthetic element to act as a placeholder for the end of an emitted declaration in
-     * order to properly emit exports.
-     */
-    function createEndOfDeclarationMarker(original: Node): EndOfDeclarationMarker;
-    /**
-     * Creates a synthetic element to act as a placeholder for the beginning of a merged declaration in
-     * order to properly emit exports.
-     */
-    function createMergeDeclarationMarker(original: Node): MergeDeclarationMarker;
-    /**
-     * Creates a synthetic expression to act as a placeholder for a not-emitted expression in
-     * order to preserve comments or sourcemap positions.
-     *
-     * @param expression The inner expression to emit.
-     * @param original The original outer expression.
-     * @param location The location for the expression. Defaults to the positions from "original" if provided.
-     */
-    function createPartiallyEmittedExpression(expression: Expression, original?: Node): PartiallyEmittedExpression;
-    function updatePartiallyEmittedExpression(node: PartiallyEmittedExpression, expression: Expression): PartiallyEmittedExpression;
-    function createCommaList(elements: ReadonlyArray<Expression>): CommaListExpression;
-    function updateCommaList(node: CommaListExpression, elements: ReadonlyArray<Expression>): CommaListExpression;
-    function createBundle(sourceFiles: ReadonlyArray<SourceFile>, prepends?: ReadonlyArray<UnparsedSource | InputFiles>): Bundle;
-    function createUnparsedSourceFile(text: string, map?: string): UnparsedSource;
-    function createInputFiles(javascript: string, declaration: string, javascriptMapText?: string, declarationMapText?: string): InputFiles;
-    function updateBundle(node: Bundle, sourceFiles: ReadonlyArray<SourceFile>, prepends?: ReadonlyArray<UnparsedSource>): Bundle;
-    function createImmediatelyInvokedFunctionExpression(statements: ReadonlyArray<Statement>): CallExpression;
-    function createImmediatelyInvokedFunctionExpression(statements: ReadonlyArray<Statement>, param: ParameterDeclaration, paramValue: Expression): CallExpression;
-    function createImmediatelyInvokedArrowFunction(statements: ReadonlyArray<Statement>): CallExpression;
-    function createImmediatelyInvokedArrowFunction(statements: ReadonlyArray<Statement>, param: ParameterDeclaration, paramValue: Expression): CallExpression;
-    function createComma(left: Expression, right: Expression): Expression;
-    function createLessThan(left: Expression, right: Expression): Expression;
-    function createAssignment(left: ObjectLiteralExpression | ArrayLiteralExpression, right: Expression): DestructuringAssignment;
-    function createAssignment(left: Expression, right: Expression): BinaryExpression;
-    function createStrictEquality(left: Expression, right: Expression): BinaryExpression;
-    function createStrictInequality(left: Expression, right: Expression): BinaryExpression;
-    function createAdd(left: Expression, right: Expression): BinaryExpression;
-    function createSubtract(left: Expression, right: Expression): BinaryExpression;
-    function createPostfixIncrement(operand: Expression): PostfixUnaryExpression;
-    function createLogicalAnd(left: Expression, right: Expression): BinaryExpression;
-    function createLogicalOr(left: Expression, right: Expression): BinaryExpression;
-    function createLogicalNot(operand: Expression): PrefixUnaryExpression;
-    function createVoidZero(): VoidExpression;
-    function createExportDefault(expression: Expression): ExportAssignment;
-    function createExternalModuleExport(exportName: Identifier): ExportDeclaration;
-    /**
-     * Clears any EmitNode entries from parse-tree nodes.
-     * @param sourceFile A source file.
-     */
-    function disposeEmitNodes(sourceFile: SourceFile): void;
-    /**
-     * Associates a node with the current transformation, initializing
-     * various transient transformation properties.
-     */
-    function getOrCreateEmitNode(node: Node): EmitNode;
-    function setTextRange<T extends TextRange>(range: T, location: TextRange | undefined): T;
-    /**
-     * Sets flags that control emit behavior of a node.
-     */
-    function setEmitFlags<T extends Node>(node: T, emitFlags: EmitFlags): T;
-    /**
-     * Sets flags that control emit behavior of a node.
-     */
-    function addEmitFlags<T extends Node>(node: T, emitFlags: EmitFlags): T;
-    /**
-     * Gets a custom text range to use when emitting source maps.
-     */
-    function getSourceMapRange(node: Node): SourceMapRange;
-    /**
-     * Sets a custom text range to use when emitting source maps.
-     */
-    function setSourceMapRange<T extends Node>(node: T, range: SourceMapRange | undefined): T;
-    /**
-     * Create an external source map source file reference
-     */
-    function createSourceMapSource(fileName: string, text: string, skipTrivia?: (pos: number) => number): SourceMapSource;
-    /**
-     * Gets the TextRange to use for source maps for a token of a node.
-     */
-    function getTokenSourceMapRange(node: Node, token: SyntaxKind): SourceMapRange | undefined;
-    /**
-     * Sets the TextRange to use for source maps for a token of a node.
-     */
-    function setTokenSourceMapRange<T extends Node>(node: T, token: SyntaxKind, range: SourceMapRange | undefined): T;
-    /**
-     * Gets a custom text range to use when emitting comments.
-     */
-    function getStartsOnNewLine(node: Node): boolean | undefined;
-    /**
-     * Sets a custom text range to use when emitting comments.
-     */
-    function setStartsOnNewLine<T extends Node>(node: T, newLine: boolean): T;
-    /**
-     * Gets a custom text range to use when emitting comments.
-     */
-    function getCommentRange(node: Node): TextRange;
-    /**
-     * Sets a custom text range to use when emitting comments.
-     */
-    function setCommentRange<T extends Node>(node: T, range: TextRange): T;
-    function getSyntheticLeadingComments(node: Node): SynthesizedComment[] | undefined;
-    function setSyntheticLeadingComments<T extends Node>(node: T, comments: SynthesizedComment[] | undefined): T;
-    function addSyntheticLeadingComment<T extends Node>(node: T, kind: SyntaxKind.SingleLineCommentTrivia | SyntaxKind.MultiLineCommentTrivia, text: string, hasTrailingNewLine?: boolean): T;
-    function getSyntheticTrailingComments(node: Node): SynthesizedComment[] | undefined;
-    function setSyntheticTrailingComments<T extends Node>(node: T, comments: SynthesizedComment[] | undefined): T;
-    function addSyntheticTrailingComment<T extends Node>(node: T, kind: SyntaxKind.SingleLineCommentTrivia | SyntaxKind.MultiLineCommentTrivia, text: string, hasTrailingNewLine?: boolean): T;
-    function moveSyntheticComments<T extends Node>(node: T, original: Node): T;
-    /**
-     * Gets the constant value to emit for an expression.
-     */
-    function getConstantValue(node: PropertyAccessExpression | ElementAccessExpression): string | number | undefined;
-    /**
-     * Sets the constant value to emit for an expression.
-     */
-    function setConstantValue(node: PropertyAccessExpression | ElementAccessExpression, value: string | number): PropertyAccessExpression | ElementAccessExpression;
-    /**
-     * Adds an EmitHelper to a node.
-     */
-    function addEmitHelper<T extends Node>(node: T, helper: EmitHelper): T;
-    /**
-     * Add EmitHelpers to a node.
-     */
-    function addEmitHelpers<T extends Node>(node: T, helpers: EmitHelper[] | undefined): T;
-    /**
-     * Removes an EmitHelper from a node.
-     */
-    function removeEmitHelper(node: Node, helper: EmitHelper): boolean;
-    /**
-     * Gets the EmitHelpers of a node.
-     */
-    function getEmitHelpers(node: Node): EmitHelper[] | undefined;
-    /**
-     * Moves matching emit helpers from a source node to a target node.
-     */
-    function moveEmitHelpers(source: Node, target: Node, predicate: (helper: EmitHelper) => boolean): void;
-    function compareEmitHelpers(x: EmitHelper, y: EmitHelper): Comparison;
-    function setOriginalNode<T extends Node>(node: T, original: Node | undefined): T;
-}
-declare namespace ts {
-    const nullTransformationContext: TransformationContext;
-    type TypeOfTag = "undefined" | "number" | "boolean" | "string" | "symbol" | "object" | "function";
-    function createTypeCheck(value: Expression, tag: TypeOfTag): BinaryExpression;
-    function createMemberAccessForPropertyName(target: Expression, memberName: PropertyName, location?: TextRange): MemberExpression;
-    function createFunctionCall(func: Expression, thisArg: Expression, argumentsList: ReadonlyArray<Expression>, location?: TextRange): CallExpression;
-    function createFunctionApply(func: Expression, thisArg: Expression, argumentsExpression: Expression, location?: TextRange): CallExpression;
-    function createArraySlice(array: Expression, start?: number | Expression): CallExpression;
-    function createArrayConcat(array: Expression, values: ReadonlyArray<Expression>): CallExpression;
-    function createMathPow(left: Expression, right: Expression, location?: TextRange): CallExpression;
-    function createExpressionForJsxElement(jsxFactoryEntity: EntityName | undefined, reactNamespace: string, tagName: Expression, props: Expression, children: ReadonlyArray<Expression>, parentElement: JsxOpeningLikeElement, location: TextRange): LeftHandSideExpression;
-    function createExpressionForJsxFragment(jsxFactoryEntity: EntityName | undefined, reactNamespace: string, children: ReadonlyArray<Expression>, parentElement: JsxOpeningFragment, location: TextRange): LeftHandSideExpression;
-    function getHelperName(name: string): Identifier;
-    function createValuesHelper(context: TransformationContext, expression: Expression, location?: TextRange): CallExpression;
-    function createReadHelper(context: TransformationContext, iteratorRecord: Expression, count: number | undefined, location?: TextRange): CallExpression;
-    function createSpreadHelper(context: TransformationContext, argumentList: ReadonlyArray<Expression>, location?: TextRange): CallExpression;
-    function createForOfBindingStatement(node: ForInitializer, boundValue: Expression): Statement;
-    function insertLeadingStatement(dest: Statement, source: Statement): Block;
-    function restoreEnclosingLabel(node: Statement, outermostLabeledStatement: LabeledStatement | undefined, afterRestoreLabelCallback?: (node: LabeledStatement) => void): Statement;
-    interface CallBinding {
-        target: LeftHandSideExpression;
-        thisArg: Expression;
-    }
-    function createCallBinding(expression: Expression, recordTempVariable: (temp: Identifier) => void, languageVersion?: ScriptTarget, cacheIdentifiers?: boolean): CallBinding;
-    function inlineExpressions(expressions: ReadonlyArray<Expression>): Expression;
-    function createExpressionFromEntityName(node: EntityName | Expression): Expression;
-    function createExpressionForPropertyName(memberName: PropertyName): Expression;
-    function createExpressionForObjectLiteralElementLike(node: ObjectLiteralExpression, property: ObjectLiteralElementLike, receiver: Expression): Expression | undefined;
-    /**
-     * Gets the internal name of a declaration. This is primarily used for declarations that can be
-     * referred to by name in the body of an ES5 class function body. An internal name will *never*
-     * be prefixed with an module or namespace export modifier like "exports." when emitted as an
-     * expression. An internal name will also *never* be renamed due to a collision with a block
-     * scoped variable.
-     *
-     * @param node The declaration.
-     * @param allowComments A value indicating whether comments may be emitted for the name.
-     * @param allowSourceMaps A value indicating whether source maps may be emitted for the name.
-     */
-    function getInternalName(node: Declaration, allowComments?: boolean, allowSourceMaps?: boolean): Identifier;
-    /**
-     * Gets whether an identifier should only be referred to by its internal name.
-     */
-    function isInternalName(node: Identifier): boolean;
-    /**
-     * Gets the local name of a declaration. This is primarily used for declarations that can be
-     * referred to by name in the declaration's immediate scope (classes, enums, namespaces). A
-     * local name will *never* be prefixed with an module or namespace export modifier like
-     * "exports." when emitted as an expression.
-     *
-     * @param node The declaration.
-     * @param allowComments A value indicating whether comments may be emitted for the name.
-     * @param allowSourceMaps A value indicating whether source maps may be emitted for the name.
-     */
-    function getLocalName(node: Declaration, allowComments?: boolean, allowSourceMaps?: boolean): Identifier;
-    /**
-     * Gets whether an identifier should only be referred to by its local name.
-     */
-    function isLocalName(node: Identifier): boolean;
-    /**
-     * Gets the export name of a declaration. This is primarily used for declarations that can be
-     * referred to by name in the declaration's immediate scope (classes, enums, namespaces). An
-     * export name will *always* be prefixed with an module or namespace export modifier like
-     * `"exports."` when emitted as an expression if the name points to an exported symbol.
-     *
-     * @param node The declaration.
-     * @param allowComments A value indicating whether comments may be emitted for the name.
-     * @param allowSourceMaps A value indicating whether source maps may be emitted for the name.
-     */
-    function getExportName(node: Declaration, allowComments?: boolean, allowSourceMaps?: boolean): Identifier;
-    /**
-     * Gets whether an identifier should only be referred to by its export representation if the
-     * name points to an exported symbol.
-     */
-    function isExportName(node: Identifier): boolean;
-    /**
-     * Gets the name of a declaration for use in declarations.
-     *
-     * @param node The declaration.
-     * @param allowComments A value indicating whether comments may be emitted for the name.
-     * @param allowSourceMaps A value indicating whether source maps may be emitted for the name.
-     */
-    function getDeclarationName(node: Declaration, allowComments?: boolean, allowSourceMaps?: boolean): Identifier;
-    /**
-     * Gets the exported name of a declaration for use in expressions.
-     *
-     * An exported name will *always* be prefixed with an module or namespace export modifier like
-     * "exports." if the name points to an exported symbol.
-     *
-     * @param ns The namespace identifier.
-     * @param node The declaration.
-     * @param allowComments A value indicating whether comments may be emitted for the name.
-     * @param allowSourceMaps A value indicating whether source maps may be emitted for the name.
-     */
-    function getExternalModuleOrNamespaceExportName(ns: Identifier | undefined, node: Declaration, allowComments?: boolean, allowSourceMaps?: boolean): Identifier | PropertyAccessExpression;
-    /**
-     * Gets a namespace-qualified name for use in expressions.
-     *
-     * @param ns The namespace identifier.
-     * @param name The name.
-     * @param allowComments A value indicating whether comments may be emitted for the name.
-     * @param allowSourceMaps A value indicating whether source maps may be emitted for the name.
-     */
-    function getNamespaceMemberName(ns: Identifier, name: Identifier, allowComments?: boolean, allowSourceMaps?: boolean): PropertyAccessExpression;
-    function convertToFunctionBody(node: ConciseBody, multiLine?: boolean): Block;
-    function convertFunctionDeclarationToExpression(node: FunctionDeclaration): FunctionExpression;
-    /**
-     * Add any necessary prologue-directives into target statement-array.
-     * The function needs to be called during each transformation step.
-     * This function needs to be called whenever we transform the statement
-     * list of a source file, namespace, or function-like body.
-     *
-     * @param target: result statements array
-     * @param source: origin statements array
-     * @param ensureUseStrict: boolean determining whether the function need to add prologue-directives
-     * @param visitor: Optional callback used to visit any custom prologue directives.
-     */
-    function addPrologue(target: Statement[], source: ReadonlyArray<Statement>, ensureUseStrict?: boolean, visitor?: (node: Node) => VisitResult<Node>): number;
-    /**
-     * Add just the standard (string-expression) prologue-directives into target statement-array.
-     * The function needs to be called during each transformation step.
-     * This function needs to be called whenever we transform the statement
-     * list of a source file, namespace, or function-like body.
-     */
-    function addStandardPrologue(target: Statement[], source: ReadonlyArray<Statement>, ensureUseStrict?: boolean): number;
-    /**
-     * Add just the custom prologue-directives into target statement-array.
-     * The function needs to be called during each transformation step.
-     * This function needs to be called whenever we transform the statement
-     * list of a source file, namespace, or function-like body.
-     */
-    function addCustomPrologue(target: Statement[], source: ReadonlyArray<Statement>, statementOffset: number, visitor?: (node: Node) => VisitResult<Node>): number;
-    function addCustomPrologue(target: Statement[], source: ReadonlyArray<Statement>, statementOffset: number | undefined, visitor?: (node: Node) => VisitResult<Node>): number | undefined;
-    function startsWithUseStrict(statements: ReadonlyArray<Statement>): boolean;
-    /**
-     * Ensures "use strict" directive is added
-     *
-     * @param statements An array of statements
-     */
-    function ensureUseStrict(statements: NodeArray<Statement>): NodeArray<Statement>;
-    /**
-     * Wraps the operand to a BinaryExpression in parentheses if they are needed to preserve the intended
-     * order of operations.
-     *
-     * @param binaryOperator The operator for the BinaryExpression.
-     * @param operand The operand for the BinaryExpression.
-     * @param isLeftSideOfBinary A value indicating whether the operand is the left side of the
-     *                           BinaryExpression.
-     */
-    function parenthesizeBinaryOperand(binaryOperator: SyntaxKind, operand: Expression, isLeftSideOfBinary: boolean, leftOperand?: Expression): Expression;
-    function parenthesizeForConditionalHead(condition: Expression): Expression;
-    function parenthesizeSubexpressionOfConditionalExpression(e: Expression): Expression;
-    /**
-     *  [Per the spec](https://tc39.github.io/ecma262/#prod-ExportDeclaration), `export default` accepts _AssigmentExpression_ but
-     *  has a lookahead restriction for `function`, `async function`, and `class`.
-     *
-     * Basically, that means we need to parenthesize in the following cases:
-     *
-     * - BinaryExpression of CommaToken
-     * - CommaList (synthetic list of multiple comma expressions)
-     * - FunctionExpression
-     * - ClassExpression
-     */
-    function parenthesizeDefaultExpression(e: Expression): Expression;
-    /**
-     * Wraps an expression in parentheses if it is needed in order to use the expression
-     * as the expression of a NewExpression node.
-     *
-     * @param expression The Expression node.
-     */
-    function parenthesizeForNew(expression: Expression): LeftHandSideExpression;
-    /**
-     * Wraps an expression in parentheses if it is needed in order to use the expression for
-     * property or element access.
-     *
-     * @param expr The expression node.
-     */
-    function parenthesizeForAccess(expression: Expression): LeftHandSideExpression;
-    function parenthesizePostfixOperand(operand: Expression): LeftHandSideExpression;
-    function parenthesizePrefixOperand(operand: Expression): UnaryExpression;
-    function parenthesizeListElements(elements: NodeArray<Expression>): NodeArray<Expression>;
-    function parenthesizeExpressionForList(expression: Expression): Expression;
-    function parenthesizeExpressionForExpressionStatement(expression: Expression): Expression;
-    function parenthesizeConditionalTypeMember(member: TypeNode): TypeNode;
-    function parenthesizeElementTypeMember(member: TypeNode): TypeNode;
-    function parenthesizeArrayTypeMember(member: TypeNode): TypeNode;
-    function parenthesizeElementTypeMembers(members: ReadonlyArray<TypeNode>): NodeArray<TypeNode>;
-    function parenthesizeTypeParameters(typeParameters: ReadonlyArray<TypeNode> | undefined): MutableNodeArray<TypeNode> | undefined;
-    function parenthesizeConciseBody(body: ConciseBody): ConciseBody;
-    enum OuterExpressionKinds {
-        Parentheses = 1,
-        Assertions = 2,
-        PartiallyEmittedExpressions = 4,
-        All = 7
-    }
-    type OuterExpression = ParenthesizedExpression | TypeAssertion | AsExpression | NonNullExpression | PartiallyEmittedExpression;
-    function isOuterExpression(node: Node, kinds?: OuterExpressionKinds): node is OuterExpression;
-    function skipOuterExpressions(node: Expression, kinds?: OuterExpressionKinds): Expression;
-    function skipOuterExpressions(node: Node, kinds?: OuterExpressionKinds): Node;
-    function skipAssertions(node: Expression): Expression;
-    function skipAssertions(node: Node): Node;
-    function recreateOuterExpressions(outerExpression: Expression | undefined, innerExpression: Expression, kinds?: OuterExpressionKinds): Expression;
-    function startOnNewLine<T extends Node>(node: T): T;
-    function getExternalHelpersModuleName(node: SourceFile): Identifier | undefined;
-    function getOrCreateExternalHelpersModuleNameIfNeeded(node: SourceFile, compilerOptions: CompilerOptions, hasExportStarsToExportValues?: boolean, hasImportStarOrImportDefault?: boolean): Identifier | undefined;
-    /**
-     * Get the name of that target module from an import or export declaration
-     */
-    function getLocalNameForExternalImport(node: ImportDeclaration | ExportDeclaration | ImportEqualsDeclaration, sourceFile: SourceFile): Identifier | undefined;
-    /**
-     * Get the name of a target module from an import/export declaration as should be written in the emitted output.
-     * The emitted output name can be different from the input if:
-     *  1. The module has a /// <amd-module name="<new name>" />
-     *  2. --out or --outFile is used, making the name relative to the rootDir
-     *  3- The containing SourceFile has an entry in renamedDependencies for the import as requested by some module loaders (e.g. System).
-     * Otherwise, a new StringLiteral node representing the module name will be returned.
-     */
-    function getExternalModuleNameLiteral(importNode: ImportDeclaration | ExportDeclaration | ImportEqualsDeclaration, sourceFile: SourceFile, host: EmitHost, resolver: EmitResolver, compilerOptions: CompilerOptions): StringLiteral | undefined;
-    /**
-     * Get the name of a module as should be written in the emitted output.
-     * The emitted output name can be different from the input if:
-     *  1. The module has a /// <amd-module name="<new name>" />
-     *  2. --out or --outFile is used, making the name relative to the rootDir
-     * Otherwise, a new StringLiteral node representing the module name will be returned.
-     */
-    function tryGetModuleNameFromFile(file: SourceFile | undefined, host: EmitHost, options: CompilerOptions): StringLiteral | undefined;
-    /**
-     * Gets the initializer of an BindingOrAssignmentElement.
-     */
-    function getInitializerOfBindingOrAssignmentElement(bindingElement: BindingOrAssignmentElement): Expression | undefined;
-    /**
-     * Gets the name of an BindingOrAssignmentElement.
-     */
-    function getTargetOfBindingOrAssignmentElement(bindingElement: BindingOrAssignmentElement): BindingOrAssignmentElementTarget | undefined;
-    /**
-     * Determines whether an BindingOrAssignmentElement is a rest element.
-     */
-    function getRestIndicatorOfBindingOrAssignmentElement(bindingElement: BindingOrAssignmentElement): BindingOrAssignmentElementRestIndicator | undefined;
-    /**
-     * Gets the property name of a BindingOrAssignmentElement
-     */
-    function getPropertyNameOfBindingOrAssignmentElement(bindingElement: BindingOrAssignmentElement): Identifier | StringLiteral | NumericLiteral | ComputedPropertyName | undefined;
-    /**
-     * Gets the elements of a BindingOrAssignmentPattern
-     */
-    function getElementsOfBindingOrAssignmentPattern(name: BindingOrAssignmentPattern): ReadonlyArray<BindingOrAssignmentElement>;
-    function convertToArrayAssignmentElement(element: BindingOrAssignmentElement): Expression;
-    function convertToObjectAssignmentElement(element: BindingOrAssignmentElement): ObjectLiteralElementLike;
-    function convertToAssignmentPattern(node: BindingOrAssignmentPattern): AssignmentPattern;
-    function convertToObjectAssignmentPattern(node: ObjectBindingOrAssignmentPattern): ObjectLiteralExpression;
-    function convertToArrayAssignmentPattern(node: ArrayBindingOrAssignmentPattern): ArrayLiteralExpression;
-    function convertToAssignmentElementTarget(node: BindingOrAssignmentElementTarget): Expression;
-}
-declare namespace ts {
-    /**
-     * Visits a Node using the supplied visitor, possibly returning a new Node in its place.
-     *
-     * @param node The Node to visit.
-     * @param visitor The callback used to visit the Node.
-     * @param test A callback to execute to verify the Node is valid.
-     * @param lift An optional callback to execute to lift a NodeArray into a valid Node.
-     */
-    function visitNode<T extends Node>(node: T | undefined, visitor: Visitor | undefined, test?: (node: Node) => boolean, lift?: (node: NodeArray<Node>) => T): T;
-    /**
-     * Visits a Node using the supplied visitor, possibly returning a new Node in its place.
-     *
-     * @param node The Node to visit.
-     * @param visitor The callback used to visit the Node.
-     * @param test A callback to execute to verify the Node is valid.
-     * @param lift An optional callback to execute to lift a NodeArray into a valid Node.
-     */
-    function visitNode<T extends Node>(node: T | undefined, visitor: Visitor | undefined, test?: (node: Node) => boolean, lift?: (node: NodeArray<Node>) => T): T | undefined;
-    /**
-     * Visits a NodeArray using the supplied visitor, possibly returning a new NodeArray in its place.
-     *
-     * @param nodes The NodeArray to visit.
-     * @param visitor The callback used to visit a Node.
-     * @param test A node test to execute for each node.
-     * @param start An optional value indicating the starting offset at which to start visiting.
-     * @param count An optional value indicating the maximum number of nodes to visit.
-     */
-    function visitNodes<T extends Node>(nodes: NodeArray<T> | undefined, visitor: Visitor, test?: (node: Node) => boolean, start?: number, count?: number): NodeArray<T>;
-    /**
-     * Visits a NodeArray using the supplied visitor, possibly returning a new NodeArray in its place.
-     *
-     * @param nodes The NodeArray to visit.
-     * @param visitor The callback used to visit a Node.
-     * @param test A node test to execute for each node.
-     * @param start An optional value indicating the starting offset at which to start visiting.
-     * @param count An optional value indicating the maximum number of nodes to visit.
-     */
-    function visitNodes<T extends Node>(nodes: NodeArray<T> | undefined, visitor: Visitor, test?: (node: Node) => boolean, start?: number, count?: number): NodeArray<T> | undefined;
-    /**
-     * Starts a new lexical environment and visits a statement list, ending the lexical environment
-     * and merging hoisted declarations upon completion.
-     */
-    function visitLexicalEnvironment(statements: NodeArray<Statement>, visitor: Visitor, context: TransformationContext, start?: number, ensureUseStrict?: boolean): NodeArray<Statement>;
-    /**
-     * Starts a new lexical environment and visits a parameter list, suspending the lexical
-     * environment upon completion.
-     */
-    function visitParameterList(nodes: NodeArray<ParameterDeclaration> | undefined, visitor: Visitor, context: TransformationContext, nodesVisitor?: typeof visitNodes): NodeArray<ParameterDeclaration>;
-    /**
-     * Resumes a suspended lexical environment and visits a function body, ending the lexical
-     * environment and merging hoisted declarations upon completion.
-     */
-    function visitFunctionBody(node: FunctionBody, visitor: Visitor, context: TransformationContext): FunctionBody;
-    /**
-     * Resumes a suspended lexical environment and visits a function body, ending the lexical
-     * environment and merging hoisted declarations upon completion.
-     */
-    function visitFunctionBody(node: FunctionBody | undefined, visitor: Visitor, context: TransformationContext): FunctionBody | undefined;
-    /**
-     * Resumes a suspended lexical environment and visits a concise body, ending the lexical
-     * environment and merging hoisted declarations upon completion.
-     */
-    function visitFunctionBody(node: ConciseBody, visitor: Visitor, context: TransformationContext): ConciseBody;
-    /**
-     * Visits each child of a Node using the supplied visitor, possibly returning a new Node of the same kind in its place.
-     *
-     * @param node The Node whose children will be visited.
-     * @param visitor The callback used to visit each child.
-     * @param context A lexical environment context for the visitor.
-     */
-    function visitEachChild<T extends Node>(node: T, visitor: Visitor, context: TransformationContext): T;
-    /**
-     * Visits each child of a Node using the supplied visitor, possibly returning a new Node of the same kind in its place.
-     *
-     * @param node The Node whose children will be visited.
-     * @param visitor The callback used to visit each child.
-     * @param context A lexical environment context for the visitor.
-     */
-    function visitEachChild<T extends Node>(node: T | undefined, visitor: Visitor, context: TransformationContext, nodesVisitor?: typeof visitNodes, tokenVisitor?: Visitor): T | undefined;
-}
-declare namespace ts {
-    /**
-     * Similar to `reduceLeft`, performs a reduction against each child of a node.
-     * NOTE: Unlike `forEachChild`, this does *not* visit every node.
-     *
-     * @param node The node containing the children to reduce.
-     * @param initial The initial value to supply to the reduction.
-     * @param f The callback function
-     */
-    function reduceEachChild<T>(node: Node | undefined, initial: T, cbNode: (memo: T, node: Node) => T, cbNodeArray?: (memo: T, nodes: NodeArray<Node>) => T): T;
-    /**
-     * Merges generated lexical declarations into a new statement list.
-     */
-    function mergeLexicalEnvironment(statements: NodeArray<Statement>, declarations: ReadonlyArray<Statement> | undefined): NodeArray<Statement>;
-    /**
-     * Appends generated lexical declarations to an array of statements.
-     */
-    function mergeLexicalEnvironment(statements: Statement[], declarations: ReadonlyArray<Statement> | undefined): Statement[];
-    /**
-     * Lifts a NodeArray containing only Statement nodes to a block.
-     *
-     * @param nodes The NodeArray.
-     */
-    function liftToBlock(nodes: ReadonlyArray<Node>): Statement;
-    /**
-     * Aggregates the TransformFlags for a Node and its subtree.
-     */
-    function aggregateTransformFlags<T extends Node>(node: T): T;
-    namespace Debug {
-        function failBadSyntaxKind(node: Node, message?: string): never;
-        const assertEachNode: (nodes: Node[], test: (node: Node) => boolean, message?: string | undefined) => void;
-        const assertNode: (node: Node | undefined, test: ((node: Node | undefined) => boolean) | undefined, message?: string | undefined) => void;
-        const assertOptionalNode: (node: Node, test: (node: Node) => boolean, message?: string | undefined) => void;
-        const assertOptionalToken: (node: Node, kind: SyntaxKind, message?: string | undefined) => void;
-        const assertMissingNode: typeof noop;
-        /**
-         * Injects debug information into frequently used types.
-         */
-        function enableDebugInfo(): void;
-    }
-}
-declare namespace ts {
-    function getOriginalNodeId(node: Node): number;
-    interface ExternalModuleInfo {
-        externalImports: (ImportDeclaration | ImportEqualsDeclaration | ExportDeclaration)[];
-        externalHelpersImportDeclaration: ImportDeclaration | undefined;
-        exportSpecifiers: Map<ExportSpecifier[]>;
-        exportedBindings: Identifier[][];
-        exportedNames: Identifier[] | undefined;
-        exportEquals: ExportAssignment | undefined;
-        hasExportStarsToExportValues: boolean;
-    }
-    function chainBundle(transformSourceFile: (x: SourceFile) => SourceFile): (x: SourceFile | Bundle) => SourceFile | Bundle;
-    function getImportNeedsImportStarHelper(node: ImportDeclaration): boolean;
-    function getImportNeedsImportDefaultHelper(node: ImportDeclaration): boolean;
-    function collectExternalModuleInfo(sourceFile: SourceFile, resolver: EmitResolver, compilerOptions: CompilerOptions): ExternalModuleInfo;
-    /**
-     * Used in the module transformer to check if an expression is reasonably without sideeffect,
-     *  and thus better to copy into multiple places rather than to cache in a temporary variable
-     *  - this is mostly subjective beyond the requirement that the expression not be sideeffecting
-     */
-    function isSimpleCopiableExpression(expression: Expression): boolean;
-    /**
-     * @param input Template string input strings
-     * @param args Names which need to be made file-level unique
-     */
-    function helperString(input: TemplateStringsArray, ...args: string[]): (uniqueName: EmitHelperUniqueNameCallback) => string;
-}
-declare namespace ts {
-    enum FlattenLevel {
-        All = 0,
-        ObjectRest = 1
-    }
-    /**
-     * Flattens a DestructuringAssignment or a VariableDeclaration to an expression.
-     *
-     * @param node The node to flatten.
-     * @param visitor An optional visitor used to visit initializers.
-     * @param context The transformation context.
-     * @param level Indicates the extent to which flattening should occur.
-     * @param needsValue An optional value indicating whether the value from the right-hand-side of
-     * the destructuring assignment is needed as part of a larger expression.
-     * @param createAssignmentCallback An optional callback used to create the assignment expression.
-     */
-    function flattenDestructuringAssignment(node: VariableDeclaration | DestructuringAssignment, visitor: ((node: Node) => VisitResult<Node>) | undefined, context: TransformationContext, level: FlattenLevel, needsValue?: boolean, createAssignmentCallback?: (name: Identifier, value: Expression, location?: TextRange) => Expression): Expression;
-    /**
-     * Flattens a VariableDeclaration or ParameterDeclaration to one or more variable declarations.
-     *
-     * @param node The node to flatten.
-     * @param visitor An optional visitor used to visit initializers.
-     * @param context The transformation context.
-     * @param boundValue The value bound to the declaration.
-     * @param skipInitializer A value indicating whether to ignore the initializer of `node`.
-     * @param hoistTempVariables Indicates whether temporary variables should not be recorded in-line.
-     * @param level Indicates the extent to which flattening should occur.
-     */
-    function flattenDestructuringBinding(node: VariableDeclaration | ParameterDeclaration, visitor: (node: Node) => VisitResult<Node>, context: TransformationContext, level: FlattenLevel, rval?: Expression, hoistTempVariables?: boolean, skipInitializer?: boolean): VariableDeclaration[];
-}
-declare namespace ts {
-    function transformTypeScript(context: TransformationContext): (node: SourceFile | Bundle) => SourceFile | Bundle;
-}
-declare namespace ts {
-    function transformES2017(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle;
-    const asyncSuperHelper: EmitHelper;
-    const advancedAsyncSuperHelper: EmitHelper;
-}
-declare namespace ts {
-    function transformESNext(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle;
-    function createAssignHelper(context: TransformationContext, attributesSegments: Expression[]): CallExpression;
-}
-declare namespace ts {
-    function transformJsx(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle;
-}
-declare namespace ts {
-    function transformES2016(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle;
-}
-declare namespace ts {
-    function transformES2015(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle;
-}
-declare namespace ts {
-    /**
-     * Transforms ES5 syntax into ES3 syntax.
-     *
-     * @param context Context and state information for the transformation.
-     */
-    function transformES5(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle;
-}
-declare namespace ts {
-    function transformGenerators(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle;
-}
-declare namespace ts {
-    function transformModule(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle;
-}
-declare namespace ts {
-    function transformSystemModule(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle;
-}
-declare namespace ts {
-    function transformES2015Module(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle;
-}
-declare namespace ts {
-    type GetSymbolAccessibilityDiagnostic = (symbolAccessibilityResult: SymbolAccessibilityResult) => (SymbolAccessibilityDiagnostic | undefined);
-    interface SymbolAccessibilityDiagnostic {
-        errorNode: Node;
-        diagnosticMessage: DiagnosticMessage;
-        typeName?: DeclarationName | QualifiedName;
-    }
-    type DeclarationDiagnosticProducing = VariableDeclaration | PropertyDeclaration | PropertySignature | BindingElement | SetAccessorDeclaration | GetAccessorDeclaration | ConstructSignatureDeclaration | CallSignatureDeclaration | MethodDeclaration | MethodSignature | FunctionDeclaration | ParameterDeclaration | TypeParameterDeclaration | ExpressionWithTypeArguments | ImportEqualsDeclaration | TypeAliasDeclaration | ConstructorDeclaration | IndexSignatureDeclaration;
-    function canProduceDiagnostics(node: Node): node is DeclarationDiagnosticProducing;
-    function createGetSymbolAccessibilityDiagnosticForNodeName(node: DeclarationDiagnosticProducing): (symbolAccessibilityResult: SymbolAccessibilityResult) => SymbolAccessibilityDiagnostic | undefined;
-    function createGetSymbolAccessibilityDiagnosticForNode(node: DeclarationDiagnosticProducing): (symbolAccessibilityResult: SymbolAccessibilityResult) => SymbolAccessibilityDiagnostic | undefined;
-}
-declare namespace ts {
-    function getDeclarationDiagnostics(host: EmitHost, resolver: EmitResolver, file: SourceFile | undefined): DiagnosticWithLocation[] | undefined;
-    /**
-     * Transforms a ts file into a .d.ts file
-     * This process requires type information, which is retrieved through the emit resolver. Because of this,
-     * in many places this transformer assumes it will be operating on parse tree nodes directly.
-     * This means that _no transforms should be allowed to occur before this one_.
-     */
-    function transformDeclarations(context: TransformationContext): {
-        (node: Bundle): Bundle;
-        (node: SourceFile): SourceFile;
-        (node: SourceFile | Bundle): SourceFile | Bundle;
-    };
-}
-declare namespace ts {
-    function getTransformers(compilerOptions: CompilerOptions, customTransformers?: CustomTransformers): TransformerFactory<SourceFile | Bundle>[];
-    /**
-     * Transforms an array of SourceFiles by passing them through each transformer.
-     *
-     * @param resolver The emit resolver provided by the checker.
-     * @param host The emit host object used to interact with the file system.
-     * @param options Compiler options to surface in the `TransformationContext`.
-     * @param nodes An array of nodes to transform.
-     * @param transforms An array of `TransformerFactory` callbacks.
-     * @param allowDtsFiles A value indicating whether to allow the transformation of .d.ts files.
-     */
-    function transformNodes<T extends Node>(resolver: EmitResolver | undefined, host: EmitHost | undefined, options: CompilerOptions, nodes: ReadonlyArray<T>, transformers: ReadonlyArray<TransformerFactory<T>>, allowDtsFiles: boolean): TransformationResult<T>;
-}
-declare namespace ts {
-    interface SourceMapWriter {
-        /**
-         * Initialize the SourceMapWriter for a new output file.
-         *
-         * @param filePath The path to the generated output file.
-         * @param sourceMapFilePath The path to the output source map file.
-         * @param sourceFileOrBundle The input source file or bundle for the program.
-         */
-        initialize(filePath: string, sourceMapFilePath: string | undefined, sourceFileOrBundle: SourceFile | Bundle, sourceMapOutput?: SourceMapData[]): void;
-        /**
-         * Reset the SourceMapWriter to an empty state.
-         */
-        reset(): void;
-        /**
-         * Set the current source file.
-         *
-         * @param sourceFile The source file.
-         */
-        setSourceFile(sourceFile: SourceMapSource): void;
-        /**
-         * Emits a mapping.
-         *
-         * If the position is synthetic (undefined or a negative value), no mapping will be
-         * created.
-         *
-         * @param pos The position.
-         */
-        emitPos(pos: number): void;
-        /**
-         * Emits a node with possible leading and trailing source maps.
-         *
-         * @param hint The current emit context
-         * @param node The node to emit.
-         * @param emitCallback The callback used to emit the node.
-         */
-        emitNodeWithSourceMap(hint: EmitHint, node: Node, emitCallback: (hint: EmitHint, node: Node) => void): void;
-        /**
-         * Emits a token of a node node with possible leading and trailing source maps.
-         *
-         * @param node The node containing the token.
-         * @param token The token to emit.
-         * @param tokenStartPos The start pos of the token.
-         * @param emitCallback The callback used to emit the token.
-         */
-        emitTokenWithSourceMap(node: Node, token: SyntaxKind, writer: (s: string) => void, tokenStartPos: number, emitCallback: (token: SyntaxKind, writer: (s: string) => void, tokenStartPos: number) => number): number;
-        /**
-         * Gets the text for the source map.
-         */
-        getText(): string;
-        /**
-         * Gets the SourceMappingURL for the source map.
-         */
-        getSourceMappingURL(): string;
-    }
-    interface SourceMapOptions {
-        sourceMap?: boolean;
-        inlineSourceMap?: boolean;
-        inlineSources?: boolean;
-        sourceRoot?: string;
-        mapRoot?: string;
-        extendedDiagnostics?: boolean;
-    }
-    function createSourceMapWriter(host: EmitHost, writer: EmitTextWriter, compilerOptions?: SourceMapOptions): SourceMapWriter;
-}
-declare namespace ts {
-    interface CommentWriter {
-        reset(): void;
-        setSourceFile(sourceFile: SourceFile): void;
-        setWriter(writer: EmitTextWriter | undefined): void;
-        emitNodeWithComments(hint: EmitHint, node: Node | undefined, emitCallback: (hint: EmitHint, node: Node) => void): void;
-        emitBodyWithDetachedComments(node: Node, detachedRange: TextRange, emitCallback: (node: Node) => void): void;
-        emitTrailingCommentsOfPosition(pos: number, prefixSpace?: boolean): void;
-        emitLeadingCommentsOfPosition(pos: number): void;
-    }
-    function createCommentWriter(printerOptions: PrinterOptions, emitPos: ((pos: number) => void) | undefined): CommentWriter;
-}
-declare namespace ts {
-    /**
-     * Iterates over the source files that are expected to have an emit output.
-     *
-     * @param host An EmitHost.
-     * @param action The action to execute.
-     * @param sourceFilesOrTargetSourceFile
-     *   If an array, the full list of source files to emit.
-     *   Else, calls `getSourceFilesToEmit` with the (optional) target source file to determine the list of source files to emit.
-     */
-    function forEachEmittedFile<T>(host: EmitHost, action: (emitFileNames: EmitFileNames, sourceFileOrBundle: SourceFile | Bundle) => T, sourceFilesOrTargetSourceFile?: ReadonlyArray<SourceFile> | SourceFile, emitOnlyDtsFiles?: boolean): T | undefined;
-    function getOutputPathsFor(sourceFile: SourceFile | Bundle, host: EmitHost, forceDtsPaths: boolean): EmitFileNames;
-    function getOutputExtension(sourceFile: SourceFile, options: CompilerOptions): Extension;
-    function emitFiles(resolver: EmitResolver, host: EmitHost, targetSourceFile: SourceFile, emitOnlyDtsFiles?: boolean, transformers?: TransformerFactory<Bundle | SourceFile>[], declarationTransformers?: TransformerFactory<Bundle | SourceFile>[]): EmitResult;
-    function createPrinter(printerOptions?: PrinterOptions, handlers?: PrintHandlers): Printer;
-}
-declare namespace ts {
-    /**
-     * Partial interface of the System thats needed to support the caching of directory structure
-     */
-    interface DirectoryStructureHost {
-        fileExists(path: string): boolean;
-        readFile(path: string, encoding?: string): string | undefined;
-        directoryExists?(path: string): boolean;
-        getDirectories?(path: string): string[];
-        readDirectory?(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
-        createDirectory?(path: string): void;
-        writeFile?(path: string, data: string, writeByteOrderMark?: boolean): void;
-    }
-    interface FileAndDirectoryExistence {
-        fileExists: boolean;
-        directoryExists: boolean;
-    }
-    interface CachedDirectoryStructureHost extends DirectoryStructureHost {
-        useCaseSensitiveFileNames: boolean;
-        getDirectories(path: string): string[];
-        readDirectory(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
-        /** Returns the queried result for the file exists and directory exists if at all it was done */
-        addOrDeleteFileOrDirectory(fileOrDirectory: string, fileOrDirectoryPath: Path): FileAndDirectoryExistence | undefined;
-        addOrDeleteFile(fileName: string, filePath: Path, eventKind: FileWatcherEventKind): void;
-        clearCache(): void;
-    }
-    function createCachedDirectoryStructureHost(host: DirectoryStructureHost, currentDirectory: string, useCaseSensitiveFileNames: boolean): CachedDirectoryStructureHost | undefined;
-    enum ConfigFileProgramReloadLevel {
-        None = 0,
-        /** Update the file name list from the disk */
-        Partial = 1,
-        /** Reload completely by re-reading contents of config file from disk and updating program */
-        Full = 2
-    }
-    /**
-     * Updates the existing missing file watches with the new set of missing files after new program is created
-     */
-    function updateMissingFilePathsWatch(program: Program, missingFileWatches: Map<FileWatcher>, createMissingFileWatch: (missingFilePath: Path) => FileWatcher): void;
-    interface WildcardDirectoryWatcher {
-        watcher: FileWatcher;
-        flags: WatchDirectoryFlags;
-    }
-    /**
-     * Updates the existing wild card directory watches with the new set of wild card directories from the config file
-     * after new program is created because the config file was reloaded or program was created first time from the config file
-     * Note that there is no need to call this function when the program is updated with additional files without reloading config files,
-     * as wildcard directories wont change unless reloading config file
-     */
-    function updateWatchingWildcardDirectories(existingWatchedForWildcards: Map<WildcardDirectoryWatcher>, wildcardDirectories: Map<WatchDirectoryFlags>, watchDirectory: (directory: string, flags: WatchDirectoryFlags) => FileWatcher): void;
-    function isEmittedFileOfProgram(program: Program | undefined, file: string): boolean;
-    enum WatchLogLevel {
-        None = 0,
-        TriggerOnly = 1,
-        Verbose = 2
-    }
-    interface WatchFileHost {
-        watchFile(path: string, callback: FileWatcherCallback, pollingInterval?: number): FileWatcher;
-    }
-    interface WatchDirectoryHost {
-        watchDirectory(path: string, callback: DirectoryWatcherCallback, recursive?: boolean): FileWatcher;
-    }
-    type WatchFile<X, Y> = (host: WatchFileHost, file: string, callback: FileWatcherCallback, pollingInterval: PollingInterval, detailInfo1?: X, detailInfo2?: Y) => FileWatcher;
-    type FilePathWatcherCallback = (fileName: string, eventKind: FileWatcherEventKind, filePath: Path) => void;
-    type WatchFilePath<X, Y> = (host: WatchFileHost, file: string, callback: FilePathWatcherCallback, pollingInterval: PollingInterval, path: Path, detailInfo1?: X, detailInfo2?: Y) => FileWatcher;
-    type WatchDirectory<X, Y> = (host: WatchDirectoryHost, directory: string, callback: DirectoryWatcherCallback, flags: WatchDirectoryFlags, detailInfo1?: X, detailInfo2?: Y) => FileWatcher;
-    interface WatchFactory<X, Y> {
-        watchFile: WatchFile<X, Y>;
-        watchFilePath: WatchFilePath<X, Y>;
-        watchDirectory: WatchDirectory<X, Y>;
-    }
-    function getWatchFactory<X, Y = undefined>(watchLogLevel: WatchLogLevel, log: (s: string) => void, getDetailWatchInfo?: GetDetailWatchInfo<X, Y>): WatchFactory<X, Y>;
-    type GetDetailWatchInfo<X, Y> = (detailInfo1: X, detailInfo2: Y | undefined) => string;
-    function closeFileWatcherOf<T extends {
-        watcher: FileWatcher;
-    }>(objWithWatcher: T): void;
-}
-declare namespace ts {
-    function findConfigFile(searchPath: string, fileExists: (fileName: string) => boolean, configName?: string): string | undefined;
-    function resolveTripleslashReference(moduleName: string, containingFile: string): string;
-    function computeCommonSourceDirectoryOfFilenames(fileNames: string[], currentDirectory: string, getCanonicalFileName: GetCanonicalFileName): string;
-    function createCompilerHost(options: CompilerOptions, setParentNodes?: boolean): CompilerHost;
-    function getPreEmitDiagnostics(program: Program, sourceFile?: SourceFile, cancellationToken?: CancellationToken): Diagnostic[];
-    interface FormatDiagnosticsHost {
-        getCurrentDirectory(): string;
-        getCanonicalFileName(fileName: string): string;
-        getNewLine(): string;
-    }
-    function formatDiagnostics(diagnostics: ReadonlyArray<Diagnostic>, host: FormatDiagnosticsHost): string;
-    function formatDiagnostic(diagnostic: Diagnostic, host: FormatDiagnosticsHost): string;
-    /** @internal */
-    enum ForegroundColorEscapeSequences {
-        Grey = "\u001B[90m",
-        Red = "\u001B[91m",
-        Yellow = "\u001B[93m",
-        Blue = "\u001B[94m",
-        Cyan = "\u001B[96m"
-    }
-    /** @internal */
-    function formatColorAndReset(text: string, formatStyle: string): string;
-    function formatDiagnosticsWithColorAndContext(diagnostics: ReadonlyArray<Diagnostic>, host: FormatDiagnosticsHost): string;
-    function flattenDiagnosticMessageText(messageText: string | DiagnosticMessageChain | undefined, newLine: string): string;
-    /**
-     * Determines if program structure is upto date or needs to be recreated
-     */
-    function isProgramUptoDate(program: Program | undefined, rootFileNames: string[], newOptions: CompilerOptions, getSourceVersion: (path: Path) => string | undefined, fileExists: (fileName: string) => boolean, hasInvalidatedResolution: HasInvalidatedResolution, hasChangedAutomaticTypeDirectiveNames: boolean): boolean;
-    function getConfigFileParsingDiagnostics(configFileParseResult: ParsedCommandLine): ReadonlyArray<Diagnostic>;
-    /**
-     * Create a new 'Program' instance. A Program is an immutable collection of 'SourceFile's and a 'CompilerOptions'
-     * that represent a compilation unit.
-     *
-     * Creating a program proceeds from a set of root files, expanding the set of inputs by following imports and
-     * triple-slash-reference-path directives transitively. '@types' and triple-slash-reference-types are also pulled in.
-     *
-     * @param createProgramOptions - The options for creating a program.
-     * @returns A 'Program' object.
-     */
-    function createProgram(createProgramOptions: CreateProgramOptions): Program;
-    /**
-     * Create a new 'Program' instance. A Program is an immutable collection of 'SourceFile's and a 'CompilerOptions'
-     * that represent a compilation unit.
-     *
-     * Creating a program proceeds from a set of root files, expanding the set of inputs by following imports and
-     * triple-slash-reference-path directives transitively. '@types' and triple-slash-reference-types are also pulled in.
-     *
-     * @param rootNames - A set of root files.
-     * @param options - The compiler options which should be used.
-     * @param host - The host interacts with the underlying file system.
-     * @param oldProgram - Reuses an old program structure.
-     * @param configFileParsingDiagnostics - error during config file parsing
-     * @returns A 'Program' object.
-     */
-    function createProgram(rootNames: ReadonlyArray<string>, options: CompilerOptions, host?: CompilerHost, oldProgram?: Program, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>): Program;
-    function parseConfigHostFromCompilerHost(host: CompilerHost): ParseConfigFileHost;
-    /**
-     * Returns the target config filename of a project reference
-     */
-    function resolveProjectReferencePath(host: CompilerHost, ref: ProjectReference): string | undefined;
-    /**
-     * Returns a DiagnosticMessage if we won't include a resolved module due to its extension.
-     * The DiagnosticMessage's parameters are the imported module name, and the filename it resolved to.
-     * This returns a diagnostic even if the module will be an untyped module.
-     */
-    function getResolutionDiagnostic(options: CompilerOptions, { extension }: ResolvedModuleFull): DiagnosticMessage | undefined;
-}
-declare namespace ts {
-    interface EmitOutput {
-        outputFiles: OutputFile[];
-        emitSkipped: boolean;
-    }
-    interface OutputFile {
-        name: string;
-        writeByteOrderMark: boolean;
-        text: string;
-    }
-}
-declare namespace ts {
-    function getFileEmitOutput(program: Program, sourceFile: SourceFile, emitOnlyDtsFiles: boolean, cancellationToken?: CancellationToken, customTransformers?: CustomTransformers): EmitOutput;
-    interface BuilderState {
-        /**
-         * Information of the file eg. its version, signature etc
-         */
-        fileInfos: Map<BuilderState.FileInfo>;
-        /**
-         * Contains the map of ReferencedSet=Referenced files of the file if module emit is enabled
-         * Otherwise undefined
-         * Thus non undefined value indicates, module emit
-         */
-        readonly referencedMap: ReadonlyMap<BuilderState.ReferencedSet> | undefined;
-        /**
-         * Map of files that have already called update signature.
-         * That means hence forth these files are assumed to have
-         * no change in their signature for this version of the program
-         */
-        hasCalledUpdateShapeSignature: Map<true>;
-        /**
-         * Cache of all files excluding default library file for the current program
-         */
-        allFilesExcludingDefaultLibraryFile: ReadonlyArray<SourceFile> | undefined;
-        /**
-         * Cache of all the file names
-         */
-        allFileNames: ReadonlyArray<string> | undefined;
-    }
-}
-declare namespace ts.BuilderState {
-    /**
-     * Information about the source file: Its version and optional signature from last emit
-     */
-    interface FileInfo {
-        readonly version: string;
-        signature: string | undefined;
-    }
-    /**
-     * Referenced files with values for the keys as referenced file's path to be true
-     */
-    type ReferencedSet = ReadonlyMap<true>;
-    /**
-     * Compute the hash to store the shape of the file
-     */
-    type ComputeHash = (data: string) => string;
-    /**
-     * Returns true if oldState is reusable, that is the emitKind = module/non module has not changed
-     */
-    function canReuseOldState(newReferencedMap: ReadonlyMap<ReferencedSet> | undefined, oldState: Readonly<BuilderState> | undefined): boolean | undefined;
-    /**
-     * Creates the state of file references and signature for the new program from oldState if it is safe
-     */
-    function create(newProgram: Program, getCanonicalFileName: GetCanonicalFileName, oldState?: Readonly<BuilderState>): BuilderState;
-    /**
-     * Gets the files affected by the path from the program
-     */
-    function getFilesAffectedBy(state: BuilderState, programOfThisState: Program, path: Path, cancellationToken: CancellationToken | undefined, computeHash: ComputeHash, cacheToUpdateSignature?: Map<string>): ReadonlyArray<SourceFile>;
-    /**
-     * Updates the signatures from the cache into state's fileinfo signatures
-     * This should be called whenever it is safe to commit the state of the builder
-     */
-    function updateSignaturesFromCache(state: BuilderState, signatureCache: Map<string>): void;
-    /**
-     * Get all the dependencies of the sourceFile
-     */
-    function getAllDependencies(state: BuilderState, programOfThisState: Program, sourceFile: SourceFile): ReadonlyArray<string>;
-}
-declare namespace ts {
-    /**
-     * State to store the changed files, affected files and cache semantic diagnostics
-     */
-    interface BuilderProgramState extends BuilderState {
-        /**
-         * Cache of semantic diagnostics for files with their Path being the key
-         */
-        semanticDiagnosticsPerFile: Map<ReadonlyArray<Diagnostic>> | undefined;
-        /**
-         * The map has key by source file's path that has been changed
-         */
-        changedFilesSet: Map<true>;
-        /**
-         * Set of affected files being iterated
-         */
-        affectedFiles: ReadonlyArray<SourceFile> | undefined;
-        /**
-         * Current index to retrieve affected file from
-         */
-        affectedFilesIndex: number | undefined;
-        /**
-         * Current changed file for iterating over affected files
-         */
-        currentChangedFilePath: Path | undefined;
-        /**
-         * Map of file signatures, with key being file path, calculated while getting current changed file's affected files
-         * These will be commited whenever the iteration through affected files of current changed file is complete
-         */
-        currentAffectedFilesSignatures: Map<string> | undefined;
-        /**
-         * Already seen affected files
-         */
-        seenAffectedFiles: Map<true> | undefined;
-        /**
-         * program corresponding to this state
-         */
-        program: Program;
-    }
-    enum BuilderProgramKind {
-        SemanticDiagnosticsBuilderProgram = 0,
-        EmitAndSemanticDiagnosticsBuilderProgram = 1
-    }
-    interface BuilderCreationParameters {
-        newProgram: Program;
-        host: BuilderProgramHost;
-        oldProgram: BuilderProgram | undefined;
-        configFileParsingDiagnostics: ReadonlyArray<Diagnostic>;
-    }
-    function getBuilderCreationParameters(newProgramOrRootNames: Program | ReadonlyArray<string> | undefined, hostOrOptions: BuilderProgramHost | CompilerOptions | undefined, oldProgramOrHost?: BuilderProgram | CompilerHost, configFileParsingDiagnosticsOrOldProgram?: ReadonlyArray<Diagnostic> | BuilderProgram, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>): BuilderCreationParameters;
-    function createBuilderProgram(kind: BuilderProgramKind.SemanticDiagnosticsBuilderProgram, builderCreationParameters: BuilderCreationParameters): SemanticDiagnosticsBuilderProgram;
-    function createBuilderProgram(kind: BuilderProgramKind.EmitAndSemanticDiagnosticsBuilderProgram, builderCreationParameters: BuilderCreationParameters): EmitAndSemanticDiagnosticsBuilderProgram;
-}
-declare namespace ts {
-    type AffectedFileResult<T> = {
-        result: T;
-        affected: SourceFile | Program;
-    } | undefined;
-    interface BuilderProgramHost {
-        /**
-         * return true if file names are treated with case sensitivity
-         */
-        useCaseSensitiveFileNames(): boolean;
-        /**
-         * If provided this would be used this hash instead of actual file shape text for detecting changes
-         */
-        createHash?: (data: string) => string;
-        /**
-         * When emit or emitNextAffectedFile are called without writeFile,
-         * this callback if present would be used to write files
-         */
-        writeFile?: WriteFileCallback;
-    }
-    /**
-     * Builder to manage the program state changes
-     */
-    interface BuilderProgram {
-        getState(): BuilderProgramState;
-        /**
-         * Returns current program
-         */
-        getProgram(): Program;
-        /**
-         * Get compiler options of the program
-         */
-        getCompilerOptions(): CompilerOptions;
-        /**
-         * Get the source file in the program with file name
-         */
-        getSourceFile(fileName: string): SourceFile | undefined;
-        /**
-         * Get a list of files in the program
-         */
-        getSourceFiles(): ReadonlyArray<SourceFile>;
-        /**
-         * Get the diagnostics for compiler options
-         */
-        getOptionsDiagnostics(cancellationToken?: CancellationToken): ReadonlyArray<Diagnostic>;
-        /**
-         * Get the diagnostics that dont belong to any file
-         */
-        getGlobalDiagnostics(cancellationToken?: CancellationToken): ReadonlyArray<Diagnostic>;
-        /**
-         * Get the diagnostics from config file parsing
-         */
-        getConfigFileParsingDiagnostics(): ReadonlyArray<Diagnostic>;
-        /**
-         * Get the syntax diagnostics, for all source files if source file is not supplied
-         */
-        getSyntacticDiagnostics(sourceFile?: SourceFile, cancellationToken?: CancellationToken): ReadonlyArray<Diagnostic>;
-        /**
-         * Get all the dependencies of the file
-         */
-        getAllDependencies(sourceFile: SourceFile): ReadonlyArray<string>;
-        /**
-         * Gets the semantic diagnostics from the program corresponding to this state of file (if provided) or whole program
-         * The semantic diagnostics are cached and managed here
-         * Note that it is assumed that when asked about semantic diagnostics through this API,
-         * the file has been taken out of affected files so it is safe to use cache or get from program and cache the diagnostics
-         * In case of SemanticDiagnosticsBuilderProgram if the source file is not provided,
-         * it will iterate through all the affected files, to ensure that cache stays valid and yet provide a way to get all semantic diagnostics
-         */
-        getSemanticDiagnostics(sourceFile?: SourceFile, cancellationToken?: CancellationToken): ReadonlyArray<Diagnostic>;
-        /**
-         * Emits the JavaScript and declaration files.
-         * When targetSource file is specified, emits the files corresponding to that source file,
-         * otherwise for the whole program.
-         * In case of EmitAndSemanticDiagnosticsBuilderProgram, when targetSourceFile is specified,
-         * it is assumed that that file is handled from affected file list. If targetSourceFile is not specified,
-         * it will only emit all the affected files instead of whole program
-         *
-         * The first of writeFile if provided, writeFile of BuilderProgramHost if provided, writeFile of compiler host
-         * in that order would be used to write the files
-         */
-        emit(targetSourceFile?: SourceFile, writeFile?: WriteFileCallback, cancellationToken?: CancellationToken, emitOnlyDtsFiles?: boolean, customTransformers?: CustomTransformers): EmitResult;
-        /**
-         * Get the current directory of the program
-         */
-        getCurrentDirectory(): string;
-    }
-    /**
-     * The builder that caches the semantic diagnostics for the program and handles the changed files and affected files
-     */
-    interface SemanticDiagnosticsBuilderProgram extends BuilderProgram {
-        /**
-         * Gets the semantic diagnostics from the program for the next affected file and caches it
-         * Returns undefined if the iteration is complete
-         */
-        getSemanticDiagnosticsOfNextAffectedFile(cancellationToken?: CancellationToken, ignoreSourceFile?: (sourceFile: SourceFile) => boolean): AffectedFileResult<ReadonlyArray<Diagnostic>>;
-    }
-    /**
-     * The builder that can handle the changes in program and iterate through changed file to emit the files
-     * The semantic diagnostics are cached per file and managed by clearing for the changed/affected files
-     */
-    interface EmitAndSemanticDiagnosticsBuilderProgram extends BuilderProgram {
-        /**
-         * Emits the next affected file's emit result (EmitResult and sourceFiles emitted) or returns undefined if iteration is complete
-         * The first of writeFile if provided, writeFile of BuilderProgramHost if provided, writeFile of compiler host
-         * in that order would be used to write the files
-         */
-        emitNextAffectedFile(writeFile?: WriteFileCallback, cancellationToken?: CancellationToken, emitOnlyDtsFiles?: boolean, customTransformers?: CustomTransformers): AffectedFileResult<EmitResult>;
-    }
-    /**
-     * Create the builder to manage semantic diagnostics and cache them
-     */
-    function createSemanticDiagnosticsBuilderProgram(newProgram: Program, host: BuilderProgramHost, oldProgram?: SemanticDiagnosticsBuilderProgram, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>): SemanticDiagnosticsBuilderProgram;
-    function createSemanticDiagnosticsBuilderProgram(rootNames: ReadonlyArray<string> | undefined, options: CompilerOptions | undefined, host?: CompilerHost, oldProgram?: SemanticDiagnosticsBuilderProgram, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>): SemanticDiagnosticsBuilderProgram;
-    /**
-     * Create the builder that can handle the changes in program and iterate through changed files
-     * to emit the those files and manage semantic diagnostics cache as well
-     */
-    function createEmitAndSemanticDiagnosticsBuilderProgram(newProgram: Program, host: BuilderProgramHost, oldProgram?: EmitAndSemanticDiagnosticsBuilderProgram, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>): EmitAndSemanticDiagnosticsBuilderProgram;
-    function createEmitAndSemanticDiagnosticsBuilderProgram(rootNames: ReadonlyArray<string> | undefined, options: CompilerOptions | undefined, host?: CompilerHost, oldProgram?: EmitAndSemanticDiagnosticsBuilderProgram, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>): EmitAndSemanticDiagnosticsBuilderProgram;
-    /**
-     * Creates a builder thats just abstraction over program and can be used with watch
-     */
-    function createAbstractBuilder(newProgram: Program, host: BuilderProgramHost, oldProgram?: BuilderProgram, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>): BuilderProgram;
-    function createAbstractBuilder(rootNames: ReadonlyArray<string> | undefined, options: CompilerOptions | undefined, host?: CompilerHost, oldProgram?: BuilderProgram, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>): BuilderProgram;
-}
-declare namespace ts {
-    /** This is the cache of module/typedirectives resolution that can be retained across program */
-    interface ResolutionCache {
-        startRecordingFilesWithChangedResolutions(): void;
-        finishRecordingFilesWithChangedResolutions(): Path[] | undefined;
-        resolveModuleNames(moduleNames: string[], containingFile: string, reusedNames: string[] | undefined): ResolvedModuleFull[];
-        getResolvedModuleWithFailedLookupLocationsFromCache(moduleName: string, containingFile: string): CachedResolvedModuleWithFailedLookupLocations | undefined;
-        resolveTypeReferenceDirectives(typeDirectiveNames: string[], containingFile: string): ResolvedTypeReferenceDirective[];
-        invalidateResolutionOfFile(filePath: Path): void;
-        removeResolutionsOfFile(filePath: Path): void;
-        setFilesWithInvalidatedNonRelativeUnresolvedImports(filesWithUnresolvedImports: Map<ReadonlyArray<string>>): void;
-        createHasInvalidatedResolution(forceAllFilesAsInvalidated?: boolean): HasInvalidatedResolution;
-        startCachingPerDirectoryResolution(): void;
-        finishCachingPerDirectoryResolution(): void;
-        updateTypeRootsWatch(): void;
-        closeTypeRootsWatch(): void;
-        clear(): void;
-    }
-    interface ResolutionWithFailedLookupLocations {
-        readonly failedLookupLocations: ReadonlyArray<string>;
-        isInvalidated?: boolean;
-        refCount?: number;
-    }
-    interface CachedResolvedModuleWithFailedLookupLocations extends ResolvedModuleWithFailedLookupLocations, ResolutionWithFailedLookupLocations {
-    }
-    interface ResolutionCacheHost extends ModuleResolutionHost {
-        toPath(fileName: string): Path;
-        getCanonicalFileName: GetCanonicalFileName;
-        getCompilationSettings(): CompilerOptions;
-        watchDirectoryOfFailedLookupLocation(directory: string, cb: DirectoryWatcherCallback, flags: WatchDirectoryFlags): FileWatcher;
-        onInvalidatedResolution(): void;
-        watchTypeRootsDirectory(directory: string, cb: DirectoryWatcherCallback, flags: WatchDirectoryFlags): FileWatcher;
-        onChangedAutomaticTypeDirectiveNames(): void;
-        getCachedDirectoryStructureHost(): CachedDirectoryStructureHost | undefined;
-        projectName?: string;
-        getGlobalCache?(): string | undefined;
-        writeLog(s: string): void;
-        maxNumberOfFilesToIterateForInvalidation?: number;
-        getCurrentProgram(): Program;
-    }
-    const maxNumberOfFilesToIterateForInvalidation = 256;
-    function createResolutionCache(resolutionHost: ResolutionCacheHost, rootDirForResolution: string | undefined, logChangesWhenResolvingModule: boolean): ResolutionCache;
-}
-declare namespace ts.moduleSpecifiers {
-    interface ModuleSpecifierPreferences {
-        importModuleSpecifierPreference?: "relative" | "non-relative";
-    }
-    function getModuleSpecifier(compilerOptions: CompilerOptions, fromSourceFile: SourceFile, fromSourceFileName: string, toFileName: string, host: ModuleSpecifierResolutionHost, preferences?: ModuleSpecifierPreferences): string;
-    function getModuleSpecifiers(moduleSymbol: Symbol, program: Program, importingSourceFile: SourceFile, host: ModuleSpecifierResolutionHost, preferences: ModuleSpecifierPreferences): ReadonlyArray<ReadonlyArray<string>>;
-}
-declare namespace ts {
-    /**
-     * Create a function that reports error by writing to the system and handles the formating of the diagnostic
-     */
-    function createDiagnosticReporter(system: System, pretty?: boolean): DiagnosticReporter;
-    /** @internal */
-    const nonClearingMessageCodes: number[];
-    /** @internal */
-    const screenStartingMessageCodes: number[];
-    /**
-     * Create a function that reports watch status by writing to the system and handles the formating of the diagnostic
-     */
-    function createWatchStatusReporter(system: System, pretty?: boolean): WatchStatusReporter;
-    /** Parses config file using System interface */
-    function parseConfigFileWithSystem(configFileName: string, optionsToExtend: CompilerOptions, system: System, reportDiagnostic: DiagnosticReporter): ParsedCommandLine | undefined;
-    /**
-     * Program structure needed to emit the files and report diagnostics
-     */
-    interface ProgramToEmitFilesAndReportErrors {
-        getCurrentDirectory(): string;
-        getCompilerOptions(): CompilerOptions;
-        getSourceFiles(): ReadonlyArray<SourceFile>;
-        getSyntacticDiagnostics(): ReadonlyArray<Diagnostic>;
-        getOptionsDiagnostics(): ReadonlyArray<Diagnostic>;
-        getGlobalDiagnostics(): ReadonlyArray<Diagnostic>;
-        getSemanticDiagnostics(): ReadonlyArray<Diagnostic>;
-        getConfigFileParsingDiagnostics(): ReadonlyArray<Diagnostic>;
-        emit(): EmitResult;
-    }
-    type ReportEmitErrorSummary = (errorCount: number) => void;
-    /**
-     * Helper that emit files, report diagnostics and lists emitted and/or source files depending on compiler options
-     */
-    function emitFilesAndReportErrors(program: ProgramToEmitFilesAndReportErrors, reportDiagnostic: DiagnosticReporter, writeFileName?: (s: string) => void, reportSummary?: ReportEmitErrorSummary): ExitStatus;
-    /**
-     * Creates the watch compiler host from system for config file in watch mode
-     */
-    function createWatchCompilerHostOfConfigFile<T extends BuilderProgram = EmitAndSemanticDiagnosticsBuilderProgram>(configFileName: string, optionsToExtend: CompilerOptions | undefined, system: System, createProgram?: CreateProgram<T>, reportDiagnostic?: DiagnosticReporter, reportWatchStatus?: WatchStatusReporter): WatchCompilerHostOfConfigFile<T>;
-    /**
-     * Creates the watch compiler host from system for compiling root files and options in watch mode
-     */
-    function createWatchCompilerHostOfFilesAndCompilerOptions<T extends BuilderProgram = EmitAndSemanticDiagnosticsBuilderProgram>(rootFiles: string[], options: CompilerOptions, system: System, createProgram?: CreateProgram<T>, reportDiagnostic?: DiagnosticReporter, reportWatchStatus?: WatchStatusReporter): WatchCompilerHostOfFilesAndCompilerOptions<T>;
-}
-declare namespace ts {
-    type WatchStatusReporter = (diagnostic: Diagnostic, newLine: string, options: CompilerOptions) => void;
-    /** Create the program with rootNames and options, if they are undefined, oldProgram and new configFile diagnostics create new program */
-    type CreateProgram<T extends BuilderProgram> = (rootNames: ReadonlyArray<string> | undefined, options: CompilerOptions | undefined, host?: CompilerHost, oldProgram?: T, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>) => T;
-    interface WatchCompilerHost<T extends BuilderProgram> {
-        /**
-         * Used to create the program when need for program creation or recreation detected
-         */
-        createProgram: CreateProgram<T>;
-        /** If provided, callback to invoke after every new program creation */
-        afterProgramCreate?(program: T): void;
-        /** If provided, called with Diagnostic message that informs about change in watch status */
-        onWatchStatusChange?(diagnostic: Diagnostic, newLine: string, options: CompilerOptions): void;
-        maxNumberOfFilesToIterateForInvalidation?: number;
-        useCaseSensitiveFileNames(): boolean;
-        getNewLine(): string;
-        getCurrentDirectory(): string;
-        getDefaultLibFileName(options: CompilerOptions): string;
-        getDefaultLibLocation?(): string;
-        createHash?(data: string): string;
-        /**
-         * Use to check file presence for source files and
-         * if resolveModuleNames is not provided (complier is in charge of module resolution) then module files as well
-         */
-        fileExists(path: string): boolean;
-        /**
-         * Use to read file text for source files and
-         * if resolveModuleNames is not provided (complier is in charge of module resolution) then module files as well
-         */
-        readFile(path: string, encoding?: string): string | undefined;
-        /** If provided, used for module resolution as well as to handle directory structure */
-        directoryExists?(path: string): boolean;
-        /** If provided, used in resolutions as well as handling directory structure */
-        getDirectories?(path: string): string[];
-        /** If provided, used to cache and handle directory structure modifications */
-        readDirectory?(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
-        /** Symbol links resolution */
-        realpath?(path: string): string;
-        /** If provided would be used to write log about compilation */
-        trace?(s: string): void;
-        /** If provided is used to get the environment variable */
-        getEnvironmentVariable?(name: string): string | undefined;
-        /** If provided, used to resolve the module names, otherwise typescript's default module resolution */
-        resolveModuleNames?(moduleNames: string[], containingFile: string, reusedNames?: string[]): ResolvedModule[];
-        /** If provided, used to resolve type reference directives, otherwise typescript's default resolution */
-        resolveTypeReferenceDirectives?(typeReferenceDirectiveNames: string[], containingFile: string): ResolvedTypeReferenceDirective[];
-        /** Used to watch changes in source files, missing files needed to update the program or config file */
-        watchFile(path: string, callback: FileWatcherCallback, pollingInterval?: number): FileWatcher;
-        /** Used to watch resolved module's failed lookup locations, config file specs, type roots where auto type reference directives are added */
-        watchDirectory(path: string, callback: DirectoryWatcherCallback, recursive?: boolean): FileWatcher;
-        /** If provided, will be used to set delayed compilation, so that multiple changes in short span are compiled together */
-        setTimeout?(callback: (...args: any[]) => void, ms: number, ...args: any[]): any;
-        /** If provided, will be used to reset existing delayed compilation */
-        clearTimeout?(timeoutId: any): void;
-    }
-    /** Internal interface used to wire emit through same host */
-    interface WatchCompilerHost<T extends BuilderProgram> {
-        createDirectory?(path: string): void;
-        writeFile?(path: string, data: string, writeByteOrderMark?: boolean): void;
-        onCachedDirectoryStructureHostCreate?(host: CachedDirectoryStructureHost): void;
-    }
-    /**
-     * Host to create watch with root files and options
-     */
-    interface WatchCompilerHostOfFilesAndCompilerOptions<T extends BuilderProgram> extends WatchCompilerHost<T> {
-        /** root files to use to generate program */
-        rootFiles: string[];
-        /** Compiler options */
-        options: CompilerOptions;
-    }
-    /**
-     * Host to create watch with config file
-     */
-    interface WatchCompilerHostOfConfigFile<T extends BuilderProgram> extends WatchCompilerHost<T>, ConfigFileDiagnosticsReporter {
-        /** Name of the config file to compile */
-        configFileName: string;
-        /** Options to extend */
-        optionsToExtend?: CompilerOptions;
-        /**
-         * Used to generate source file names from the config file and its include, exclude, files rules
-         * and also to cache the directory stucture
-         */
-        readDirectory(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
-    }
-    /**
-     * Host to create watch with config file that is already parsed (from tsc)
-     */
-    interface WatchCompilerHostOfConfigFile<T extends BuilderProgram> extends WatchCompilerHost<T> {
-        optionsToExtend?: CompilerOptions;
-        configFileParsingResult?: ParsedCommandLine;
-    }
-    interface Watch<T> {
-        /** Synchronize with host and get updated program */
-        getProgram(): T;
-        /** Gets the existing program without synchronizing with changes on host */
-        getCurrentProgram(): T;
-    }
-    /**
-     * Creates the watch what generates program using the config file
-     */
-    interface WatchOfConfigFile<T> extends Watch<T> {
-    }
-    /**
-     * Creates the watch that generates program using the root files and compiler options
-     */
-    interface WatchOfFilesAndCompilerOptions<T> extends Watch<T> {
-        /** Updates the root files in the program, only if this is not config file compilation */
-        updateRootFileNames(fileNames: string[]): void;
-    }
-    /**
-     * Create the watch compiler host for either configFile or fileNames and its options
-     */
-    function createWatchCompilerHost<T extends BuilderProgram>(rootFiles: string[], options: CompilerOptions, system: System, createProgram?: CreateProgram<T>, reportDiagnostic?: DiagnosticReporter, reportWatchStatus?: WatchStatusReporter): WatchCompilerHostOfFilesAndCompilerOptions<T>;
-    function createWatchCompilerHost<T extends BuilderProgram>(configFileName: string, optionsToExtend: CompilerOptions | undefined, system: System, createProgram?: CreateProgram<T>, reportDiagnostic?: DiagnosticReporter, reportWatchStatus?: WatchStatusReporter): WatchCompilerHostOfConfigFile<T>;
-    /**
-     * Creates the watch from the host for root files and compiler options
-     */
-    function createWatchProgram<T extends BuilderProgram>(host: WatchCompilerHostOfFilesAndCompilerOptions<T>): WatchOfFilesAndCompilerOptions<T>;
-    /**
-     * Creates the watch from the host for config file
-     */
-    function createWatchProgram<T extends BuilderProgram>(host: WatchCompilerHostOfConfigFile<T>): WatchOfConfigFile<T>;
-}
-declare namespace ts {
-    /**
-     * Branded string for keeping track of when we've turned an ambiguous path
-     * specified like "./blah" to an absolute path to an actual
-     * tsconfig file, e.g. "/root/blah/tsconfig.json"
-     */
-    type ResolvedConfigFileName = string & {
-        _isResolvedConfigFileName: never;
-    };
-    interface BuildHost {
-        verbose(diag: DiagnosticMessage, ...args: string[]): void;
-        error(diag: DiagnosticMessage, ...args: string[]): void;
-        errorDiagnostic(diag: Diagnostic): void;
-        message(diag: DiagnosticMessage, ...args: string[]): void;
-    }
-    /**
-     * A BuildContext tracks what's going on during the course of a build.
-     *
-     * Callers may invoke any number of build requests within the same context;
-     * until the context is reset, each project will only be built at most once.
-     *
-     * Example: In a standard setup where project B depends on project A, and both are out of date,
-     * a failed build of A will result in A remaining out of date. When we try to build
-     * B, we should immediately bail instead of recomputing A's up-to-date status again.
-     *
-     * This also matters for performing fast (i.e. fake) downstream builds of projects
-     * when their upstream .d.ts files haven't changed content (but have newer timestamps)
-     */
-    interface BuildContext {
-        options: BuildOptions;
-        /**
-         * Map from output file name to its pre-build timestamp
-         */
-        unchangedOutputs: FileMap<Date>;
-        /**
-         * Map from config file name to up-to-date status
-         */
-        projectStatus: FileMap<UpToDateStatus>;
-        invalidatedProjects: FileMap<true>;
-        queuedProjects: FileMap<true>;
-        missingRoots: Map<true>;
-    }
-    type Mapper = ReturnType<typeof createDependencyMapper>;
-    interface DependencyGraph {
-        buildQueue: ResolvedConfigFileName[];
-        dependencyMap: Mapper;
-    }
-    interface BuildOptions {
-        dry: boolean;
-        force: boolean;
-        verbose: boolean;
-    }
-    enum UpToDateStatusType {
-        Unbuildable = 0,
-        UpToDate = 1,
-        /**
-         * The project appears out of date because its upstream inputs are newer than its outputs,
-         * but all of its outputs are actually newer than the previous identical outputs of its (.d.ts) inputs.
-         * This means we can Pseudo-build (just touch timestamps), as if we had actually built this project.
-         */
-        UpToDateWithUpstreamTypes = 2,
-        OutputMissing = 3,
-        OutOfDateWithSelf = 4,
-        OutOfDateWithUpstream = 5,
-        UpstreamOutOfDate = 6,
-        UpstreamBlocked = 7,
-        /**
-         * Projects with no outputs (i.e. "solution" files)
-         */
-        ContainerOnly = 8
-    }
-    type UpToDateStatus = Status.Unbuildable | Status.UpToDate | Status.OutputMissing | Status.OutOfDateWithSelf | Status.OutOfDateWithUpstream | Status.UpstreamOutOfDate | Status.UpstreamBlocked | Status.ContainerOnly;
-    namespace Status {
-        /**
-         * The project can't be built at all in its current state. For example,
-         * its config file cannot be parsed, or it has a syntax error or missing file
-         */
-        interface Unbuildable {
-            type: UpToDateStatusType.Unbuildable;
-            reason: string;
-        }
-        /**
-         * This project doesn't have any outputs, so "is it up to date" is a meaningless question.
-         */
-        interface ContainerOnly {
-            type: UpToDateStatusType.ContainerOnly;
-        }
-        /**
-         * The project is up to date with respect to its inputs.
-         * We track what the newest input file is.
-         */
-        interface UpToDate {
-            type: UpToDateStatusType.UpToDate | UpToDateStatusType.UpToDateWithUpstreamTypes;
-            newestInputFileTime: Date;
-            newestInputFileName: string;
-            newestDeclarationFileContentChangedTime: Date;
-            newestOutputFileTime: Date;
-            newestOutputFileName: string;
-            oldestOutputFileName: string;
-        }
-        /**
-         * One or more of the outputs of the project does not exist.
-         */
-        interface OutputMissing {
-            type: UpToDateStatusType.OutputMissing;
-            /**
-             * The name of the first output file that didn't exist
-             */
-            missingOutputFileName: string;
-        }
-        /**
-         * One or more of the project's outputs is older than its newest input.
-         */
-        interface OutOfDateWithSelf {
-            type: UpToDateStatusType.OutOfDateWithSelf;
-            outOfDateOutputFileName: string;
-            newerInputFileName: string;
-        }
-        /**
-         * This project depends on an out-of-date project, so shouldn't be built yet
-         */
-        interface UpstreamOutOfDate {
-            type: UpToDateStatusType.UpstreamOutOfDate;
-            upstreamProjectName: string;
-        }
-        /**
-         * This project depends an upstream project with build errors
-         */
-        interface UpstreamBlocked {
-            type: UpToDateStatusType.UpstreamBlocked;
-            upstreamProjectName: string;
-        }
-        /**
-         * One or more of the project's outputs is older than the newest output of
-         * an upstream project.
-         */
-        interface OutOfDateWithUpstream {
-            type: UpToDateStatusType.OutOfDateWithUpstream;
-            outOfDateOutputFileName: string;
-            newerProjectName: string;
-        }
-    }
-    interface FileMap<T> {
-        setValue(fileName: string, value: T): void;
-        getValue(fileName: string): T | never;
-        getValueOrUndefined(fileName: string): T | undefined;
-        hasKey(fileName: string): boolean;
-        removeKey(fileName: string): void;
-        getKeys(): string[];
-    }
-    function createDependencyMapper(): {
-        addReference: (childConfigFileName: ResolvedConfigFileName, parentConfigFileName: ResolvedConfigFileName) => void;
-        getReferencesTo: (parentConfigFileName: ResolvedConfigFileName) => ResolvedConfigFileName[];
-        getReferencesOf: (childConfigFileName: ResolvedConfigFileName) => ResolvedConfigFileName[];
-        getKeys: () => ReadonlyArray<ResolvedConfigFileName>;
-    };
-    function createBuildContext(options: BuildOptions): BuildContext;
-    function performBuild(args: string[], compilerHost: CompilerHost, buildHost: BuildHost, system?: System): void;
-    /**
-     * A SolutionBuilder has an immutable set of rootNames that are the "entry point" projects, but
-     * can dynamically add/remove other projects based on changes on the rootNames' references
-     */
-    function createSolutionBuilder(compilerHost: CompilerHost, buildHost: BuildHost, rootNames: ReadonlyArray<string>, defaultOptions: BuildOptions, system?: System): {
-        buildAllProjects: () => void;
-        getUpToDateStatus: (project: ParsedCommandLine | undefined) => UpToDateStatus;
-        getUpToDateStatusOfFile: (configFileName: ResolvedConfigFileName) => UpToDateStatus;
-        cleanAllProjects: () => void;
-        resetBuildContext: (opts?: BuildOptions) => void;
-        getBuildGraph: (configFileNames: ReadonlyArray<string>) => DependencyGraph | undefined;
-        invalidateProject: (configFileName: string) => void;
-        buildInvalidatedProjects: () => void;
-        buildDependentInvalidatedProjects: () => void;
-        resolveProjectName: (name: string) => ResolvedConfigFileName | undefined;
-        startWatching: () => void;
-    };
-}
-//# sourceMappingURL=compiler.d.ts.map
-declare namespace ts {
-    interface Node {
-        getSourceFile(): SourceFile;
-        getChildCount(sourceFile?: SourceFile): number;
-        getChildAt(index: number, sourceFile?: SourceFile): Node;
-        getChildren(sourceFile?: SourceFile): Node[];
-        getChildren(sourceFile?: SourceFileLike): Node[];
-        getStart(sourceFile?: SourceFile, includeJsDocComment?: boolean): number;
-        getStart(sourceFile?: SourceFileLike, includeJsDocComment?: boolean): number;
-        getFullStart(): number;
-        getEnd(): number;
-        getWidth(sourceFile?: SourceFileLike): number;
-        getFullWidth(): number;
-        getLeadingTriviaWidth(sourceFile?: SourceFile): number;
-        getFullText(sourceFile?: SourceFile): string;
-        getText(sourceFile?: SourceFile): string;
-        getFirstToken(sourceFile?: SourceFile): Node | undefined;
-        getLastToken(sourceFile?: SourceFile): Node | undefined;
-        forEachChild<T>(cbNode: (node: Node) => T | undefined, cbNodeArray?: (nodes: NodeArray<Node>) => T | undefined): T | undefined;
-    }
-    interface Identifier {
-        readonly text: string;
-    }
-    interface Symbol {
-        readonly name: string;
-        getFlags(): SymbolFlags;
-        getEscapedName(): __String;
-        getName(): string;
-        getDeclarations(): Declaration[] | undefined;
-        getDocumentationComment(typeChecker: TypeChecker | undefined): SymbolDisplayPart[];
-        getJsDocTags(): JSDocTagInfo[];
-    }
-    interface Type {
-        getFlags(): TypeFlags;
-        getSymbol(): Symbol | undefined;
-        getProperties(): Symbol[];
-        getProperty(propertyName: string): Symbol | undefined;
-        getApparentProperties(): Symbol[];
-        getCallSignatures(): Signature[];
-        getConstructSignatures(): Signature[];
-        getStringIndexType(): Type | undefined;
-        getNumberIndexType(): Type | undefined;
-        getBaseTypes(): BaseType[] | undefined;
-        getNonNullableType(): Type;
-        getConstraint(): Type | undefined;
-        getDefault(): Type | undefined;
-        isUnion(): this is UnionType;
-        isIntersection(): this is IntersectionType;
-        isUnionOrIntersection(): this is UnionOrIntersectionType;
-        isLiteral(): this is LiteralType;
-        isStringLiteral(): this is StringLiteralType;
-        isNumberLiteral(): this is NumberLiteralType;
-        isTypeParameter(): this is TypeParameter;
-        isClassOrInterface(): this is InterfaceType;
-        isClass(): this is InterfaceType;
-    }
-    interface Signature {
-        getDeclaration(): SignatureDeclaration;
-        getTypeParameters(): TypeParameter[] | undefined;
-        getParameters(): Symbol[];
-        getReturnType(): Type;
-        getDocumentationComment(typeChecker: TypeChecker | undefined): SymbolDisplayPart[];
-        getJsDocTags(): JSDocTagInfo[];
-    }
-    interface SourceFile {
-        version: string;
-        scriptSnapshot: IScriptSnapshot | undefined;
-        nameTable: UnderscoreEscapedMap<number> | undefined;
-        getNamedDeclarations(): Map<Declaration[]>;
-        getLineAndCharacterOfPosition(pos: number): LineAndCharacter;
-        getLineEndOfPosition(pos: number): number;
-        getLineStarts(): ReadonlyArray<number>;
-        getPositionOfLineAndCharacter(line: number, character: number): number;
-        update(newText: string, textChangeRange: TextChangeRange): SourceFile;
-        sourceMapper?: sourcemaps.SourceMapper;
-    }
-    interface SourceFileLike {
-        getLineAndCharacterOfPosition(pos: number): LineAndCharacter;
-        sourceMapper?: sourcemaps.SourceMapper;
-    }
-    interface SourceMapSource {
-        getLineAndCharacterOfPosition(pos: number): LineAndCharacter;
-    }
-    /**
-     * Represents an immutable snapshot of a script at a specified time.Once acquired, the
-     * snapshot is observably immutable. i.e. the same calls with the same parameters will return
-     * the same values.
-     */
-    interface IScriptSnapshot {
-        /** Gets a portion of the script snapshot specified by [start, end). */
-        getText(start: number, end: number): string;
-        /** Gets the length of this script snapshot. */
-        getLength(): number;
-        /**
-         * Gets the TextChangeRange that describe how the text changed between this text and
-         * an older version.  This information is used by the incremental parser to determine
-         * what sections of the script need to be re-parsed.  'undefined' can be returned if the
-         * change range cannot be determined.  However, in that case, incremental parsing will
-         * not happen and the entire document will be re - parsed.
-         */
-        getChangeRange(oldSnapshot: IScriptSnapshot): TextChangeRange | undefined;
-        /** Releases all resources held by this script snapshot */
-        dispose?(): void;
-    }
-    namespace ScriptSnapshot {
-        function fromString(text: string): IScriptSnapshot;
-    }
-    interface PreProcessedFileInfo {
-        referencedFiles: FileReference[];
-        typeReferenceDirectives: FileReference[];
-        libReferenceDirectives: FileReference[];
-        importedFiles: FileReference[];
-        ambientExternalModules?: string[];
-        isLibFile: boolean;
-    }
-    interface HostCancellationToken {
-        isCancellationRequested(): boolean;
-    }
-    interface InstallPackageOptions {
-        fileName: Path;
-        packageName: string;
-    }
-    interface LanguageServiceHost extends GetEffectiveTypeRootsHost {
-        getCompilationSettings(): CompilerOptions;
-        getNewLine?(): string;
-        getProjectVersion?(): string;
-        getScriptFileNames(): string[];
-        getScriptKind?(fileName: string): ScriptKind;
-        getScriptVersion(fileName: string): string;
-        getScriptSnapshot(fileName: string): IScriptSnapshot | undefined;
-        getProjectReferences?(): ReadonlyArray<ProjectReference> | undefined;
-        getLocalizedDiagnosticMessages?(): any;
-        getCancellationToken?(): HostCancellationToken;
-        getCurrentDirectory(): string;
-        getDefaultLibFileName(options: CompilerOptions): string;
-        log?(s: string): void;
-        trace?(s: string): void;
-        error?(s: string): void;
-        useCaseSensitiveFileNames?(): boolean;
-        readDirectory?(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
-        readFile?(path: string, encoding?: string): string | undefined;
-        realpath?(path: string): string;
-        fileExists?(path: string): boolean;
-        getTypeRootsVersion?(): number;
-        resolveModuleNames?(moduleNames: string[], containingFile: string, reusedNames?: string[]): ResolvedModule[];
-        getResolvedModuleWithFailedLookupLocationsFromCache?(modulename: string, containingFile: string): ResolvedModuleWithFailedLookupLocations | undefined;
-        resolveTypeReferenceDirectives?(typeDirectiveNames: string[], containingFile: string): ResolvedTypeReferenceDirective[];
-        hasInvalidatedResolution?: HasInvalidatedResolution;
-        hasChangedAutomaticTypeDirectiveNames?: boolean;
-        getDirectories?(directoryName: string): string[];
-        /**
-         * Gets a set of custom transformers to use during emit.
-         */
-        getCustomTransformers?(): CustomTransformers | undefined;
-        isKnownTypesPackageName?(name: string): boolean;
-        installPackage?(options: InstallPackageOptions): Promise<ApplyCodeActionCommandResult>;
-    }
-    interface UserPreferences {
-        readonly disableSuggestions?: boolean;
-        readonly quotePreference?: "double" | "single";
-        readonly includeCompletionsForModuleExports?: boolean;
-        readonly includeCompletionsWithInsertText?: boolean;
-        readonly importModuleSpecifierPreference?: "relative" | "non-relative";
-        readonly allowTextChangesInNewFiles?: boolean;
-    }
-    const defaultPreferences: UserPreferences;
-    interface LanguageService {
-        cleanupSemanticCache(): void;
-        getSyntacticDiagnostics(fileName: string): DiagnosticWithLocation[];
-        /** The first time this is called, it will return global diagnostics (no location). */
-        getSemanticDiagnostics(fileName: string): Diagnostic[];
-        getSuggestionDiagnostics(fileName: string): DiagnosticWithLocation[];
-        getCompilerOptionsDiagnostics(): Diagnostic[];
-        /**
-         * @deprecated Use getEncodedSyntacticClassifications instead.
-         */
-        getSyntacticClassifications(fileName: string, span: TextSpan): ClassifiedSpan[];
-        /**
-         * @deprecated Use getEncodedSemanticClassifications instead.
-         */
-        getSemanticClassifications(fileName: string, span: TextSpan): ClassifiedSpan[];
-        getEncodedSyntacticClassifications(fileName: string, span: TextSpan): Classifications;
-        getEncodedSemanticClassifications(fileName: string, span: TextSpan): Classifications;
-        getCompletionsAtPosition(fileName: string, position: number, options: GetCompletionsAtPositionOptions | undefined): CompletionInfo | undefined;
-        getCompletionEntryDetails(fileName: string, position: number, name: string, formatOptions: FormatCodeOptions | FormatCodeSettings | undefined, source: string | undefined, preferences: UserPreferences | undefined): CompletionEntryDetails | undefined;
-        getCompletionEntrySymbol(fileName: string, position: number, name: string, source: string | undefined): Symbol | undefined;
-        getQuickInfoAtPosition(fileName: string, position: number): QuickInfo | undefined;
-        getNameOrDottedNameSpan(fileName: string, startPos: number, endPos: number): TextSpan | undefined;
-        getBreakpointStatementAtPosition(fileName: string, position: number): TextSpan | undefined;
-        getSignatureHelpItems(fileName: string, position: number): SignatureHelpItems | undefined;
-        getRenameInfo(fileName: string, position: number): RenameInfo;
-        findRenameLocations(fileName: string, position: number, findInStrings: boolean, findInComments: boolean): RenameLocation[] | undefined;
-        getDefinitionAtPosition(fileName: string, position: number): DefinitionInfo[] | undefined;
-        getDefinitionAndBoundSpan(fileName: string, position: number): DefinitionInfoAndBoundSpan | undefined;
-        getTypeDefinitionAtPosition(fileName: string, position: number): DefinitionInfo[] | undefined;
-        getImplementationAtPosition(fileName: string, position: number): ImplementationLocation[] | undefined;
-        getReferencesAtPosition(fileName: string, position: number): ReferenceEntry[] | undefined;
-        findReferences(fileName: string, position: number): ReferencedSymbol[] | undefined;
-        getDocumentHighlights(fileName: string, position: number, filesToSearch: string[]): DocumentHighlights[] | undefined;
-        /** @deprecated */
-        getOccurrencesAtPosition(fileName: string, position: number): ReferenceEntry[] | undefined;
-        getNavigateToItems(searchValue: string, maxResultCount?: number, fileName?: string, excludeDtsFiles?: boolean): NavigateToItem[];
-        getNavigationBarItems(fileName: string): NavigationBarItem[];
-        getNavigationTree(fileName: string): NavigationTree;
-        getOutliningSpans(fileName: string): OutliningSpan[];
-        getTodoComments(fileName: string, descriptors: TodoCommentDescriptor[]): TodoComment[];
-        getBraceMatchingAtPosition(fileName: string, position: number): TextSpan[];
-        getIndentationAtPosition(fileName: string, position: number, options: EditorOptions | EditorSettings): number;
-        getFormattingEditsForRange(fileName: string, start: number, end: number, options: FormatCodeOptions | FormatCodeSettings): TextChange[];
-        getFormattingEditsForDocument(fileName: string, options: FormatCodeOptions | FormatCodeSettings): TextChange[];
-        getFormattingEditsAfterKeystroke(fileName: string, position: number, key: string, options: FormatCodeOptions | FormatCodeSettings): TextChange[];
-        getDocCommentTemplateAtPosition(fileName: string, position: number): TextInsertion | undefined;
-        isValidBraceCompletionAtPosition(fileName: string, position: number, openingBrace: number): boolean;
-        /**
-         * This will return a defined result if the position is after the `>` of the opening tag, or somewhere in the text, of a JSXElement with no closing tag.
-         * Editors should call this after `>` is typed.
-         */
-        getJsxClosingTagAtPosition(fileName: string, position: number): JsxClosingTagInfo | undefined;
-        getSpanOfEnclosingComment(fileName: string, position: number, onlyMultiLine: boolean): TextSpan | undefined;
-        toLineColumnOffset?(fileName: string, position: number): LineAndCharacter;
-        getCodeFixesAtPosition(fileName: string, start: number, end: number, errorCodes: ReadonlyArray<number>, formatOptions: FormatCodeSettings, preferences: UserPreferences): ReadonlyArray<CodeFixAction>;
-        getCombinedCodeFix(scope: CombinedCodeFixScope, fixId: {}, formatOptions: FormatCodeSettings, preferences: UserPreferences): CombinedCodeActions;
-        applyCodeActionCommand(action: CodeActionCommand): Promise<ApplyCodeActionCommandResult>;
-        applyCodeActionCommand(action: CodeActionCommand[]): Promise<ApplyCodeActionCommandResult[]>;
-        applyCodeActionCommand(action: CodeActionCommand | CodeActionCommand[]): Promise<ApplyCodeActionCommandResult | ApplyCodeActionCommandResult[]>;
-        /** @deprecated `fileName` will be ignored */
-        applyCodeActionCommand(fileName: string, action: CodeActionCommand): Promise<ApplyCodeActionCommandResult>;
-        /** @deprecated `fileName` will be ignored */
-        applyCodeActionCommand(fileName: string, action: CodeActionCommand[]): Promise<ApplyCodeActionCommandResult[]>;
-        /** @deprecated `fileName` will be ignored */
-        applyCodeActionCommand(fileName: string, action: CodeActionCommand | CodeActionCommand[]): Promise<ApplyCodeActionCommandResult | ApplyCodeActionCommandResult[]>;
-        getApplicableRefactors(fileName: string, positionOrRange: number | TextRange, preferences: UserPreferences | undefined): ApplicableRefactorInfo[];
-        getEditsForRefactor(fileName: string, formatOptions: FormatCodeSettings, positionOrRange: number | TextRange, refactorName: string, actionName: string, preferences: UserPreferences | undefined): RefactorEditInfo | undefined;
-        organizeImports(scope: OrganizeImportsScope, formatOptions: FormatCodeSettings, preferences: UserPreferences | undefined): ReadonlyArray<FileTextChanges>;
-        getEditsForFileRename(oldFilePath: string, newFilePath: string, formatOptions: FormatCodeSettings, preferences: UserPreferences | undefined): ReadonlyArray<FileTextChanges>;
-        getEmitOutput(fileName: string, emitOnlyDtsFiles?: boolean): EmitOutput;
-        getProgram(): Program | undefined;
-        getNonBoundSourceFile(fileName: string): SourceFile;
-        dispose(): void;
-    }
-    interface JsxClosingTagInfo {
-        readonly newText: string;
-    }
-    interface CombinedCodeFixScope {
-        type: "file";
-        fileName: string;
-    }
-    type OrganizeImportsScope = CombinedCodeFixScope;
-    type CompletionsTriggerCharacter = "." | '"' | "'" | "`" | "/" | "@" | "<";
-    interface GetCompletionsAtPositionOptions extends UserPreferences {
-        /** If the editor is asking for completions because a certain character was typed, and not because the user explicitly requested them, this should be set. */
-        triggerCharacter?: CompletionsTriggerCharacter;
-        /** @deprecated Use includeCompletionsForModuleExports */
-        includeExternalModuleExports?: boolean;
-        /** @deprecated Use includeCompletionsWithInsertText */
-        includeInsertTextCompletions?: boolean;
-    }
-    interface ApplyCodeActionCommandResult {
-        successMessage: string;
-    }
-    interface Classifications {
-        spans: number[];
-        endOfLineState: EndOfLineState;
-    }
-    interface ClassifiedSpan {
-        textSpan: TextSpan;
-        classificationType: ClassificationTypeNames;
-    }
-    /**
-     * Navigation bar interface designed for visual studio's dual-column layout.
-     * This does not form a proper tree.
-     * The navbar is returned as a list of top-level items, each of which has a list of child items.
-     * Child items always have an empty array for their `childItems`.
-     */
-    interface NavigationBarItem {
-        text: string;
-        kind: ScriptElementKind;
-        kindModifiers: string;
-        spans: TextSpan[];
-        childItems: NavigationBarItem[];
-        indent: number;
-        bolded: boolean;
-        grayed: boolean;
-    }
-    /**
-     * Node in a tree of nested declarations in a file.
-     * The top node is always a script or module node.
-     */
-    interface NavigationTree {
-        /** Name of the declaration, or a short description, e.g. "<class>". */
-        text: string;
-        kind: ScriptElementKind;
-        /** ScriptElementKindModifier separated by commas, e.g. "public,abstract" */
-        kindModifiers: string;
-        /**
-         * Spans of the nodes that generated this declaration.
-         * There will be more than one if this is the result of merging.
-         */
-        spans: TextSpan[];
-        nameSpan: TextSpan | undefined;
-        /** Present if non-empty */
-        childItems?: NavigationTree[];
-    }
-    interface TodoCommentDescriptor {
-        text: string;
-        priority: number;
-    }
-    interface TodoComment {
-        descriptor: TodoCommentDescriptor;
-        message: string;
-        position: number;
-    }
-    class TextChange {
-        span: TextSpan;
-        newText: string;
-    }
-    interface FileTextChanges {
-        fileName: string;
-        textChanges: TextChange[];
-        isNewFile?: boolean;
-    }
-    interface CodeAction {
-        /** Description of the code action to display in the UI of the editor */
-        description: string;
-        /** Text changes to apply to each file as part of the code action */
-        changes: FileTextChanges[];
-        /**
-         * If the user accepts the code fix, the editor should send the action back in a `applyAction` request.
-         * This allows the language service to have side effects (e.g. installing dependencies) upon a code fix.
-         */
-        commands?: CodeActionCommand[];
-    }
-    interface CodeFixAction extends CodeAction {
-        /** Short name to identify the fix, for use by telemetry. */
-        fixName: string;
-        /**
-         * If present, one may call 'getCombinedCodeFix' with this fixId.
-         * This may be omitted to indicate that the code fix can't be applied in a group.
-         */
-        fixId?: {};
-        fixAllDescription?: string;
-    }
-    interface CombinedCodeActions {
-        changes: ReadonlyArray<FileTextChanges>;
-        commands?: ReadonlyArray<CodeActionCommand>;
-    }
-    type CodeActionCommand = InstallPackageAction;
-    interface InstallPackageAction {
-        file: string;
-        type: "install package";
-        packageName: string;
-    }
-    /**
-     * A set of one or more available refactoring actions, grouped under a parent refactoring.
-     */
-    interface ApplicableRefactorInfo {
-        /**
-         * The programmatic name of the refactoring
-         */
-        name: string;
-        /**
-         * A description of this refactoring category to show to the user.
-         * If the refactoring gets inlined (see below), this text will not be visible.
-         */
-        description: string;
-        /**
-         * Inlineable refactorings can have their actions hoisted out to the top level
-         * of a context menu. Non-inlineanable refactorings should always be shown inside
-         * their parent grouping.
-         *
-         * If not specified, this value is assumed to be 'true'
-         */
-        inlineable?: boolean;
-        actions: RefactorActionInfo[];
-    }
-    /**
-     * Represents a single refactoring action - for example, the "Extract Method..." refactor might
-     * offer several actions, each corresponding to a surround class or closure to extract into.
-     */
-    interface RefactorActionInfo {
-        /**
-         * The programmatic name of the refactoring action
-         */
-        name: string;
-        /**
-         * A description of this refactoring action to show to the user.
-         * If the parent refactoring is inlined away, this will be the only text shown,
-         * so this description should make sense by itself if the parent is inlineable=true
-         */
-        description: string;
-    }
-    /**
-     * A set of edits to make in response to a refactor action, plus an optional
-     * location where renaming should be invoked from
-     */
-    interface RefactorEditInfo {
-        edits: FileTextChanges[];
-        renameFilename?: string;
-        renameLocation?: number;
-        commands?: CodeActionCommand[];
-    }
-    interface TextInsertion {
-        newText: string;
-        /** The position in newText the caret should point to after the insertion. */
-        caretOffset: number;
-    }
-    interface DocumentSpan {
-        textSpan: TextSpan;
-        fileName: string;
-        /**
-         * If the span represents a location that was remapped (e.g. via a .d.ts.map file),
-         * then the original filename and span will be specified here
-         */
-        originalTextSpan?: TextSpan;
-        originalFileName?: string;
-    }
-    interface RenameLocation extends DocumentSpan {
-    }
-    interface ReferenceEntry extends DocumentSpan {
-        isWriteAccess: boolean;
-        isDefinition: boolean;
-        isInString?: true;
-    }
-    interface ImplementationLocation extends DocumentSpan {
-        kind: ScriptElementKind;
-        displayParts: SymbolDisplayPart[];
-    }
-    interface DocumentHighlights {
-        fileName: string;
-        highlightSpans: HighlightSpan[];
-    }
-    enum HighlightSpanKind {
-        none = "none",
-        definition = "definition",
-        reference = "reference",
-        writtenReference = "writtenReference"
-    }
-    interface HighlightSpan {
-        fileName?: string;
-        isInString?: true;
-        textSpan: TextSpan;
-        kind: HighlightSpanKind;
-    }
-    interface NavigateToItem {
-        name: string;
-        kind: ScriptElementKind;
-        kindModifiers: string;
-        matchKind: string;
-        isCaseSensitive: boolean;
-        fileName: string;
-        textSpan: TextSpan;
-        containerName: string;
-        containerKind: ScriptElementKind;
-    }
-    enum IndentStyle {
-        None = 0,
-        Block = 1,
-        Smart = 2
-    }
-    interface EditorOptions {
-        BaseIndentSize?: number;
-        IndentSize: number;
-        TabSize: number;
-        NewLineCharacter: string;
-        ConvertTabsToSpaces: boolean;
-        IndentStyle: IndentStyle;
-    }
-    interface EditorSettings {
-        baseIndentSize?: number;
-        indentSize?: number;
-        tabSize?: number;
-        newLineCharacter?: string;
-        convertTabsToSpaces?: boolean;
-        indentStyle?: IndentStyle;
-    }
-    interface FormatCodeOptions extends EditorOptions {
-        InsertSpaceAfterCommaDelimiter: boolean;
-        InsertSpaceAfterSemicolonInForStatements: boolean;
-        InsertSpaceBeforeAndAfterBinaryOperators: boolean;
-        InsertSpaceAfterConstructor?: boolean;
-        InsertSpaceAfterKeywordsInControlFlowStatements: boolean;
-        InsertSpaceAfterFunctionKeywordForAnonymousFunctions: boolean;
-        InsertSpaceAfterOpeningAndBeforeClosingNonemptyParenthesis: boolean;
-        InsertSpaceAfterOpeningAndBeforeClosingNonemptyBrackets: boolean;
-        InsertSpaceAfterOpeningAndBeforeClosingNonemptyBraces?: boolean;
-        InsertSpaceAfterOpeningAndBeforeClosingTemplateStringBraces: boolean;
-        InsertSpaceAfterOpeningAndBeforeClosingJsxExpressionBraces?: boolean;
-        InsertSpaceAfterTypeAssertion?: boolean;
-        InsertSpaceBeforeFunctionParenthesis?: boolean;
-        PlaceOpenBraceOnNewLineForFunctions: boolean;
-        PlaceOpenBraceOnNewLineForControlBlocks: boolean;
-        insertSpaceBeforeTypeAnnotation?: boolean;
-    }
-    interface FormatCodeSettings extends EditorSettings {
-        insertSpaceAfterCommaDelimiter?: boolean;
-        insertSpaceAfterSemicolonInForStatements?: boolean;
-        insertSpaceBeforeAndAfterBinaryOperators?: boolean;
-        insertSpaceAfterConstructor?: boolean;
-        insertSpaceAfterKeywordsInControlFlowStatements?: boolean;
-        insertSpaceAfterFunctionKeywordForAnonymousFunctions?: boolean;
-        insertSpaceAfterOpeningAndBeforeClosingNonemptyParenthesis?: boolean;
-        insertSpaceAfterOpeningAndBeforeClosingNonemptyBrackets?: boolean;
-        insertSpaceAfterOpeningAndBeforeClosingNonemptyBraces?: boolean;
-        insertSpaceAfterOpeningAndBeforeClosingTemplateStringBraces?: boolean;
-        insertSpaceAfterOpeningAndBeforeClosingJsxExpressionBraces?: boolean;
-        insertSpaceAfterTypeAssertion?: boolean;
-        insertSpaceBeforeFunctionParenthesis?: boolean;
-        placeOpenBraceOnNewLineForFunctions?: boolean;
-        placeOpenBraceOnNewLineForControlBlocks?: boolean;
-        insertSpaceBeforeTypeAnnotation?: boolean;
-        indentMultiLineObjectLiteralBeginningOnBlankLine?: boolean;
-    }
-    interface DefinitionInfo extends DocumentSpan {
-        kind: ScriptElementKind;
-        name: string;
-        containerKind: ScriptElementKind;
-        containerName: string;
-    }
-    interface DefinitionInfoAndBoundSpan {
-        definitions?: ReadonlyArray<DefinitionInfo>;
-        textSpan: TextSpan;
-    }
-    interface ReferencedSymbolDefinitionInfo extends DefinitionInfo {
-        displayParts: SymbolDisplayPart[];
-    }
-    interface ReferencedSymbol {
-        definition: ReferencedSymbolDefinitionInfo;
-        references: ReferenceEntry[];
-    }
-    enum SymbolDisplayPartKind {
-        aliasName = 0,
-        className = 1,
-        enumName = 2,
-        fieldName = 3,
-        interfaceName = 4,
-        keyword = 5,
-        lineBreak = 6,
-        numericLiteral = 7,
-        stringLiteral = 8,
-        localName = 9,
-        methodName = 10,
-        moduleName = 11,
-        operator = 12,
-        parameterName = 13,
-        propertyName = 14,
-        punctuation = 15,
-        space = 16,
-        text = 17,
-        typeParameterName = 18,
-        enumMemberName = 19,
-        functionName = 20,
-        regularExpressionLiteral = 21
-    }
-    interface SymbolDisplayPart {
-        text: string;
-        kind: string;
-    }
-    interface JSDocTagInfo {
-        name: string;
-        text?: string;
-    }
-    interface QuickInfo {
-        kind: ScriptElementKind;
-        kindModifiers: string;
-        textSpan: TextSpan;
-        displayParts?: SymbolDisplayPart[];
-        documentation?: SymbolDisplayPart[];
-        tags?: JSDocTagInfo[];
-    }
-    interface RenameInfo {
-        canRename: boolean;
-        localizedErrorMessage?: string;
-        displayName: string;
-        fullDisplayName: string;
-        kind: ScriptElementKind;
-        kindModifiers: string;
-        triggerSpan: TextSpan;
-    }
-    interface SignatureHelpParameter {
-        name: string;
-        documentation: SymbolDisplayPart[];
-        displayParts: SymbolDisplayPart[];
-        isOptional: boolean;
-    }
-    /**
-     * Represents a single signature to show in signature help.
-     * The id is used for subsequent calls into the language service to ask questions about the
-     * signature help item in the context of any documents that have been updated.  i.e. after
-     * an edit has happened, while signature help is still active, the host can ask important
-     * questions like 'what parameter is the user currently contained within?'.
-     */
-    interface SignatureHelpItem {
-        isVariadic: boolean;
-        prefixDisplayParts: SymbolDisplayPart[];
-        suffixDisplayParts: SymbolDisplayPart[];
-        separatorDisplayParts: SymbolDisplayPart[];
-        parameters: SignatureHelpParameter[];
-        documentation: SymbolDisplayPart[];
-        tags: JSDocTagInfo[];
-    }
-    /**
-     * Represents a set of signature help items, and the preferred item that should be selected.
-     */
-    interface SignatureHelpItems {
-        items: SignatureHelpItem[];
-        applicableSpan: TextSpan;
-        selectedItemIndex: number;
-        argumentIndex: number;
-        argumentCount: number;
-    }
-    interface CompletionInfo {
-        /** Not true for all glboal completions. This will be true if the enclosing scope matches a few syntax kinds. See `isSnippetScope`. */
-        isGlobalCompletion: boolean;
-        isMemberCompletion: boolean;
-        /**
-         * true when the current location also allows for a new identifier
-         */
-        isNewIdentifierLocation: boolean;
-        entries: CompletionEntry[];
-    }
-    interface CompletionEntry {
-        name: string;
-        kind: ScriptElementKind;
-        kindModifiers?: string;
-        sortText: string;
-        insertText?: string;
-        /**
-         * An optional span that indicates the text to be replaced by this completion item.
-         * If present, this span should be used instead of the default one.
-         * It will be set if the required span differs from the one generated by the default replacement behavior.
-         */
-        replacementSpan?: TextSpan;
-        hasAction?: true;
-        source?: string;
-        isRecommended?: true;
-    }
-    interface CompletionEntryDetails {
-        name: string;
-        kind: ScriptElementKind;
-        kindModifiers: string;
-        displayParts: SymbolDisplayPart[];
-        documentation?: SymbolDisplayPart[];
-        tags?: JSDocTagInfo[];
-        codeActions?: CodeAction[];
-        source?: SymbolDisplayPart[];
-    }
-    interface OutliningSpan {
-        /** The span of the document to actually collapse. */
-        textSpan: TextSpan;
-        /** The span of the document to display when the user hovers over the collapsed span. */
-        hintSpan: TextSpan;
-        /** The text to display in the editor for the collapsed region. */
-        bannerText: string;
-        /**
-         * Whether or not this region should be automatically collapsed when
-         * the 'Collapse to Definitions' command is invoked.
-         */
-        autoCollapse: boolean;
-        /**
-         * Classification of the contents of the span
-         */
-        kind: OutliningSpanKind;
-    }
-    enum OutliningSpanKind {
-        /** Single or multi-line comments */
-        Comment = "comment",
-        /** Sections marked by '// #region' and '// #endregion' comments */
-        Region = "region",
-        /** Declarations and expressions */
-        Code = "code",
-        /** Contiguous blocks of import declarations */
-        Imports = "imports"
-    }
-    enum OutputFileType {
-        JavaScript = 0,
-        SourceMap = 1,
-        Declaration = 2
-    }
-    enum EndOfLineState {
-        None = 0,
-        InMultiLineCommentTrivia = 1,
-        InSingleQuoteStringLiteral = 2,
-        InDoubleQuoteStringLiteral = 3,
-        InTemplateHeadOrNoSubstitutionTemplate = 4,
-        InTemplateMiddleOrTail = 5,
-        InTemplateSubstitutionPosition = 6
-    }
-    enum TokenClass {
-        Punctuation = 0,
-        Keyword = 1,
-        Operator = 2,
-        Comment = 3,
-        Whitespace = 4,
-        Identifier = 5,
-        NumberLiteral = 6,
-        StringLiteral = 7,
-        RegExpLiteral = 8
-    }
-    interface ClassificationResult {
-        finalLexState: EndOfLineState;
-        entries: ClassificationInfo[];
-    }
-    interface ClassificationInfo {
-        length: number;
-        classification: TokenClass;
-    }
-    interface Classifier {
-        /**
-         * Gives lexical classifications of tokens on a line without any syntactic context.
-         * For instance, a token consisting of the text 'string' can be either an identifier
-         * named 'string' or the keyword 'string', however, because this classifier is not aware,
-         * it relies on certain heuristics to give acceptable results. For classifications where
-         * speed trumps accuracy, this function is preferable; however, for true accuracy, the
-         * syntactic classifier is ideal. In fact, in certain editing scenarios, combining the
-         * lexical, syntactic, and semantic classifiers may issue the best user experience.
-         *
-         * @param text                      The text of a line to classify.
-         * @param lexState                  The state of the lexical classifier at the end of the previous line.
-         * @param syntacticClassifierAbsent Whether the client is *not* using a syntactic classifier.
-         *                                  If there is no syntactic classifier (syntacticClassifierAbsent=true),
-         *                                  certain heuristics may be used in its place; however, if there is a
-         *                                  syntactic classifier (syntacticClassifierAbsent=false), certain
-         *                                  classifications which may be incorrectly categorized will be given
-         *                                  back as Identifiers in order to allow the syntactic classifier to
-         *                                  subsume the classification.
-         * @deprecated Use getLexicalClassifications instead.
-         */
-        getClassificationsForLine(text: string, lexState: EndOfLineState, syntacticClassifierAbsent: boolean): ClassificationResult;
-        getEncodedLexicalClassifications(text: string, endOfLineState: EndOfLineState, syntacticClassifierAbsent: boolean): Classifications;
-    }
-    enum ScriptElementKind {
-        unknown = "",
-        warning = "warning",
-        /** predefined type (void) or keyword (class) */
-        keyword = "keyword",
-        /** top level script node */
-        scriptElement = "script",
-        /** module foo {} */
-        moduleElement = "module",
-        /** class X {} */
-        classElement = "class",
-        /** var x = class X {} */
-        localClassElement = "local class",
-        /** interface Y {} */
-        interfaceElement = "interface",
-        /** type T = ... */
-        typeElement = "type",
-        /** enum E */
-        enumElement = "enum",
-        enumMemberElement = "enum member",
-        /**
-         * Inside module and script only
-         * const v = ..
-         */
-        variableElement = "var",
-        /** Inside function */
-        localVariableElement = "local var",
-        /**
-         * Inside module and script only
-         * function f() { }
-         */
-        functionElement = "function",
-        /** Inside function */
-        localFunctionElement = "local function",
-        /** class X { [public|private]* foo() {} } */
-        memberFunctionElement = "method",
-        /** class X { [public|private]* [get|set] foo:number; } */
-        memberGetAccessorElement = "getter",
-        memberSetAccessorElement = "setter",
-        /**
-         * class X { [public|private]* foo:number; }
-         * interface Y { foo:number; }
-         */
-        memberVariableElement = "property",
-        /** class X { constructor() { } } */
-        constructorImplementationElement = "constructor",
-        /** interface Y { ():number; } */
-        callSignatureElement = "call",
-        /** interface Y { []:number; } */
-        indexSignatureElement = "index",
-        /** interface Y { new():Y; } */
-        constructSignatureElement = "construct",
-        /** function foo(*Y*: string) */
-        parameterElement = "parameter",
-        typeParameterElement = "type parameter",
-        primitiveType = "primitive type",
-        label = "label",
-        alias = "alias",
-        constElement = "const",
-        letElement = "let",
-        directory = "directory",
-        externalModuleName = "external module name",
-        /**
-         * <JsxTagName attribute1 attribute2={0} />
-         */
-        jsxAttribute = "JSX attribute",
-        /** String literal */
-        string = "string"
-    }
-    enum ScriptElementKindModifier {
-        none = "",
-        publicMemberModifier = "public",
-        privateMemberModifier = "private",
-        protectedMemberModifier = "protected",
-        exportedModifier = "export",
-        ambientModifier = "declare",
-        staticModifier = "static",
-        abstractModifier = "abstract",
-        optionalModifier = "optional"
-    }
-    enum ClassificationTypeNames {
-        comment = "comment",
-        identifier = "identifier",
-        keyword = "keyword",
-        numericLiteral = "number",
-        operator = "operator",
-        stringLiteral = "string",
-        whiteSpace = "whitespace",
-        text = "text",
-        punctuation = "punctuation",
-        className = "class name",
-        enumName = "enum name",
-        interfaceName = "interface name",
-        moduleName = "module name",
-        typeParameterName = "type parameter name",
-        typeAliasName = "type alias name",
-        parameterName = "parameter name",
-        docCommentTagName = "doc comment tag name",
-        jsxOpenTagName = "jsx open tag name",
-        jsxCloseTagName = "jsx close tag name",
-        jsxSelfClosingTagName = "jsx self closing tag name",
-        jsxAttribute = "jsx attribute",
-        jsxText = "jsx text",
-        jsxAttributeStringLiteralValue = "jsx attribute string literal value"
-    }
-    enum ClassificationType {
-        comment = 1,
-        identifier = 2,
-        keyword = 3,
-        numericLiteral = 4,
-        operator = 5,
-        stringLiteral = 6,
-        regularExpressionLiteral = 7,
-        whiteSpace = 8,
-        text = 9,
-        punctuation = 10,
-        className = 11,
-        enumName = 12,
-        interfaceName = 13,
-        moduleName = 14,
-        typeParameterName = 15,
-        typeAliasName = 16,
-        parameterName = 17,
-        docCommentTagName = 18,
-        jsxOpenTagName = 19,
-        jsxCloseTagName = 20,
-        jsxSelfClosingTagName = 21,
-        jsxAttribute = 22,
-        jsxText = 23,
-        jsxAttributeStringLiteralValue = 24
-    }
-}
-interface PromiseConstructor {
-    new <T>(executor: (resolve: (value?: T | PromiseLike<T>) => void, reject: (reason?: any) => void) => void): Promise<T>;
-    reject(reason: any): Promise<never>;
-    all<T>(values: (T | PromiseLike<T>)[]): Promise<T[]>;
-}
-declare var Promise: PromiseConstructor;
-declare namespace ts {
-    const scanner: Scanner;
-    enum SemanticMeaning {
-        None = 0,
-        Value = 1,
-        Type = 2,
-        Namespace = 4,
-        All = 7
-    }
-    function getMeaningFromDeclaration(node: Node): SemanticMeaning;
-    function getMeaningFromLocation(node: Node): SemanticMeaning;
-    function isInRightSideOfInternalImportEqualsDeclaration(node: Node): boolean;
-    function isCallExpressionTarget(node: Node): boolean;
-    function isNewExpressionTarget(node: Node): boolean;
-    function climbPastPropertyAccess(node: Node): Node;
-    function getTargetLabel(referenceNode: Node, labelName: string): Identifier | undefined;
-    function isJumpStatementTarget(node: Node): node is Identifier & {
-        parent: BreakOrContinueStatement;
-    };
-    function isLabelOfLabeledStatement(node: Node): node is Identifier;
-    function isLabelName(node: Node): boolean;
-    function isRightSideOfQualifiedName(node: Node): boolean;
-    function isRightSideOfPropertyAccess(node: Node): boolean;
-    function isNameOfModuleDeclaration(node: Node): boolean;
-    function isNameOfFunctionDeclaration(node: Node): boolean;
-    function isLiteralNameOfPropertyDeclarationOrIndexAccess(node: StringLiteral | NumericLiteral): boolean;
-    function isExpressionOfExternalModuleImportEqualsDeclaration(node: Node): boolean;
-    function getContainerNode(node: Node): Declaration | undefined;
-    function getNodeKind(node: Node): ScriptElementKind;
-    function isThis(node: Node): boolean;
-    interface ListItemInfo {
-        listItemIndex: number;
-        list: Node;
-    }
-    function getLineStartPositionForPosition(position: number, sourceFile: SourceFileLike): number;
-    function rangeContainsRange(r1: TextRange, r2: TextRange): boolean;
-    function rangeContainsPosition(r: TextRange, pos: number): boolean;
-    function rangeContainsPositionExclusive(r: TextRange, pos: number): boolean;
-    function startEndContainsRange(start: number, end: number, range: TextRange): boolean;
-    function rangeContainsStartEnd(range: TextRange, start: number, end: number): boolean;
-    function rangeOverlapsWithStartEnd(r1: TextRange, start: number, end: number): boolean;
-    function startEndOverlapsWithStartEnd(start1: number, end1: number, start2: number, end2: number): boolean;
-    /**
-     * Assumes `candidate.start <= position` holds.
-     */
-    function positionBelongsToNode(candidate: Node, position: number, sourceFile: SourceFile): boolean;
-    function findListItemInfo(node: Node): ListItemInfo | undefined;
-    function hasChildOfKind(n: Node, kind: SyntaxKind, sourceFile: SourceFile): boolean;
-    function findChildOfKind<T extends Node>(n: Node, kind: T["kind"], sourceFile: SourceFileLike): T | undefined;
-    function findContainingList(node: Node): SyntaxList | undefined;
-    /**
-     * Gets the token whose text has range [start, end) and
-     * position >= start and (position < end or (position === end && token is literal or keyword or identifier))
-     */
-    function getTouchingPropertyName(sourceFile: SourceFile, position: number): Node;
-    /**
-     * Returns the token if position is in [start, end).
-     * If position === end, returns the preceding token if includeItemAtEndPosition(previousToken) === true
-     */
-    function getTouchingToken(sourceFile: SourceFile, position: number, includeJsDocComment: boolean, includePrecedingTokenAtEndPosition?: (n: Node) => boolean): Node;
-    /** Returns a token if position is in [start-of-leading-trivia, end) */
-    function getTokenAtPosition(sourceFile: SourceFile, position: number, includeJsDocComment: boolean, includeEndPosition?: boolean): Node;
-    /**
-     * The token on the left of the position is the token that strictly includes the position
-     * or sits to the left of the cursor if it is on a boundary. For example
-     *
-     *   fo|o               -> will return foo
-     *   foo <comment> |bar -> will return foo
-     *
-     */
-    function findTokenOnLeftOfPosition(file: SourceFile, position: number): Node | undefined;
-    function findNextToken(previousToken: Node, parent: Node, sourceFile: SourceFile): Node | undefined;
-    /**
-     * Finds the rightmost token satisfying `token.end <= position`,
-     * excluding `JsxText` tokens containing only whitespace.
-     */
-    function findPrecedingToken(position: number, sourceFile: SourceFile, startNode?: Node, includeJsDoc?: boolean): Node | undefined;
-    function isInString(sourceFile: SourceFile, position: number, previousToken?: Node | undefined): boolean;
-    /**
-     * returns true if the position is in between the open and close elements of an JSX expression.
-     */
-    function isInsideJsxElementOrAttribute(sourceFile: SourceFile, position: number): boolean;
-    function isInTemplateString(sourceFile: SourceFile, position: number): boolean;
-    function findPrecedingMatchingToken(token: Node, matchingTokenKind: SyntaxKind, sourceFile: SourceFile): Node | undefined;
-    interface PossibleTypeArgumentInfo {
-        readonly called: Identifier;
-        readonly nTypeArguments: number;
-    }
-    function isPossiblyTypeArgumentPosition(tokenIn: Node, sourceFile: SourceFile): PossibleTypeArgumentInfo | undefined;
-    /**
-     * Returns true if the cursor at position in sourceFile is within a comment.
-     *
-     * @param tokenAtPosition Must equal `getTokenAtPosition(sourceFile, position)
-     * @param predicate Additional predicate to test on the comment range.
-     */
-    function isInComment(sourceFile: SourceFile, position: number, tokenAtPosition?: Node, predicate?: (c: CommentRange) => boolean): boolean;
-    function hasDocComment(sourceFile: SourceFile, position: number): boolean | undefined;
-    function getNodeModifiers(node: Node): string;
-    function getTypeArgumentOrTypeParameterList(node: Node): NodeArray<Node> | undefined;
-    function isComment(kind: SyntaxKind): boolean;
-    function isStringOrRegularExpressionOrTemplateLiteral(kind: SyntaxKind): boolean;
-    function isPunctuation(kind: SyntaxKind): boolean;
-    function isInsideTemplateLiteral(node: TemplateLiteralToken, position: number, sourceFile: SourceFile): boolean;
-    function isAccessibilityModifier(kind: SyntaxKind): boolean;
-    function cloneCompilerOptions(options: CompilerOptions): CompilerOptions;
-    function isArrayLiteralOrObjectLiteralDestructuringPattern(node: Node): boolean;
-    function isInReferenceComment(sourceFile: SourceFile, position: number): boolean;
-    function isInNonReferenceComment(sourceFile: SourceFile, position: number): boolean;
-    function createTextSpanFromNode(node: Node, sourceFile?: SourceFile): TextSpan;
-    function createTextSpanFromRange(range: TextRange): TextSpan;
-    function createTextRangeFromSpan(span: TextSpan): TextRange;
-    function createTextChangeFromStartLength(start: number, length: number, newText: string): TextChange;
-    function createTextChange(span: TextSpan, newText: string): TextChange;
-    const typeKeywords: ReadonlyArray<SyntaxKind>;
-    function isTypeKeyword(kind: SyntaxKind): boolean;
-    /** True if the symbol is for an external module, as opposed to a namespace. */
-    function isExternalModuleSymbol(moduleSymbol: Symbol): boolean;
-    /** Returns `true` the first time it encounters a node and `false` afterwards. */
-    type NodeSeenTracker<T = Node> = (node: T) => boolean;
-    function nodeSeenTracker<T extends Node>(): NodeSeenTracker<T>;
-    function getSnapshotText(snap: IScriptSnapshot): string;
-    function repeatString(str: string, count: number): string;
-    function skipConstraint(type: Type): Type;
-    function getNameFromPropertyName(name: PropertyName): string | undefined;
-    function programContainsEs6Modules(program: Program): boolean;
-    function compilerOptionsIndicateEs6Modules(compilerOptions: CompilerOptions): boolean;
-    function hostUsesCaseSensitiveFileNames(host: LanguageServiceHost): boolean;
-    function hostGetCanonicalFileName(host: LanguageServiceHost): GetCanonicalFileName;
-    function makeImportIfNecessary(defaultImport: Identifier | undefined, namedImports: ReadonlyArray<ImportSpecifier> | undefined, moduleSpecifier: string, quotePreference: QuotePreference): ImportDeclaration | undefined;
-    function makeImport(defaultImport: Identifier | undefined, namedImports: ReadonlyArray<ImportSpecifier> | undefined, moduleSpecifier: string | Expression, quotePreference: QuotePreference): ImportDeclaration;
-    function makeStringLiteral(text: string, quotePreference: QuotePreference): StringLiteral;
-    enum QuotePreference {
-        Single = 0,
-        Double = 1
-    }
-    function getQuotePreference(sourceFile: SourceFile, preferences: UserPreferences): QuotePreference;
-    function symbolNameNoDefault(symbol: Symbol): string | undefined;
-    function symbolEscapedNameNoDefault(symbol: Symbol): __String | undefined;
-    function getPropertySymbolFromBindingElement(checker: TypeChecker, bindingElement: BindingElement & {
-        name: Identifier;
-    }): Symbol | undefined;
-    /**
-     * Find symbol of the given property-name and add the symbol to the given result array
-     * @param symbol a symbol to start searching for the given propertyName
-     * @param propertyName a name of property to search for
-     * @param result an array of symbol of found property symbols
-     * @param previousIterationSymbolsCache a cache of symbol from previous iterations of calling this function to prevent infinite revisiting of the same symbol.
-     *                                The value of previousIterationSymbol is undefined when the function is first called.
-     */
-    function getPropertySymbolsFromBaseTypes<T>(symbol: Symbol, propertyName: string, checker: TypeChecker, cb: (symbol: Symbol) => T | undefined): T | undefined;
-    function isMemberSymbolInBaseType(memberSymbol: Symbol, checker: TypeChecker): boolean;
-    class NodeSet {
-        private map;
-        add(node: Node): void;
-        has(node: Node): boolean;
-        forEach(cb: (node: Node) => void): void;
-        some(pred: (node: Node) => boolean): boolean;
-    }
-    function getParentNodeInSpan(node: Node | undefined, file: SourceFile, span: TextSpan): Node | undefined;
-}
-declare namespace ts {
-    function isFirstDeclarationOfSymbolParameter(symbol: Symbol): boolean;
-    function symbolPart(text: string, symbol: Symbol): SymbolDisplayPart;
-    function displayPart(text: string, kind: SymbolDisplayPartKind): SymbolDisplayPart;
-    function spacePart(): SymbolDisplayPart;
-    function keywordPart(kind: SyntaxKind): SymbolDisplayPart;
-    function punctuationPart(kind: SyntaxKind): SymbolDisplayPart;
-    function operatorPart(kind: SyntaxKind): SymbolDisplayPart;
-    function textOrKeywordPart(text: string): SymbolDisplayPart;
-    function textPart(text: string): SymbolDisplayPart;
-    /**
-     * The default is CRLF.
-     */
-    function getNewLineOrDefaultFromHost(host: LanguageServiceHost | LanguageServiceShimHost, formatSettings?: FormatCodeSettings): string;
-    function lineBreakPart(): SymbolDisplayPart;
-    function mapToDisplayParts(writeDisplayParts: (writer: DisplayPartsSymbolWriter) => void): SymbolDisplayPart[];
-    function typeToDisplayParts(typechecker: TypeChecker, type: Type, enclosingDeclaration?: Node, flags?: TypeFormatFlags): SymbolDisplayPart[];
-    function symbolToDisplayParts(typeChecker: TypeChecker, symbol: Symbol, enclosingDeclaration?: Node, meaning?: SymbolFlags, flags?: SymbolFormatFlags): SymbolDisplayPart[];
-    function signatureToDisplayParts(typechecker: TypeChecker, signature: Signature, enclosingDeclaration?: Node, flags?: TypeFormatFlags): SymbolDisplayPart[];
-    function isImportOrExportSpecifierName(location: Node): location is Identifier;
-    /**
-     * Strip off existed single quotes or double quotes from a given string
-     *
-     * @return non-quoted string
-     */
-    function stripQuotes(name: string): string;
-    function startsWithQuote(name: string): boolean;
-    function scriptKindIs(fileName: string, host: LanguageServiceHost, ...scriptKinds: ScriptKind[]): boolean;
-    function getScriptKind(fileName: string, host?: LanguageServiceHost): ScriptKind;
-    function getUniqueSymbolId(symbol: Symbol, checker: TypeChecker): number;
-    function getFirstNonSpaceCharacterPosition(text: string, position: number): number;
-    /**
-     * Creates a deep, memberwise clone of a node with no source map location.
-     *
-     * WARNING: This is an expensive operation and is only intended to be used in refactorings
-     * and code fixes (because those are triggered by explicit user actions).
-     */
-    function getSynthesizedDeepClone<T extends Node | undefined>(node: T, includeTrivia?: boolean): T;
-    function getSynthesizedDeepClones<T extends Node>(nodes: NodeArray<T>, includeTrivia?: boolean): NodeArray<T>;
-    function getSynthesizedDeepClones<T extends Node>(nodes: NodeArray<T> | undefined, includeTrivia?: boolean): NodeArray<T> | undefined;
-    /**
-     * Sets EmitFlags to suppress leading and trailing trivia on the node.
-     */
-    function suppressLeadingAndTrailingTrivia(node: Node): void;
-    /**
-     * Sets EmitFlags to suppress leading trivia on the node.
-     */
-    function suppressLeadingTrivia(node: Node): void;
-    /**
-     * Sets EmitFlags to suppress trailing trivia on the node.
-     */
-    function suppressTrailingTrivia(node: Node): void;
-    function getUniqueName(baseName: string, sourceFile: SourceFile): string;
-    /**
-     * @return The index of the (only) reference to the extracted symbol.  We want the cursor
-     * to be on the reference, rather than the declaration, because it's closer to where the
-     * user was before extracting it.
-     */
-    function getRenameLocation(edits: ReadonlyArray<FileTextChanges>, renameFilename: string, name: string, preferLastLocation: boolean): number;
-}
-declare namespace ts {
-    function createClassifier(): Classifier;
-    function getSemanticClassifications(typeChecker: TypeChecker, cancellationToken: CancellationToken, sourceFile: SourceFile, classifiableNames: UnderscoreEscapedMap<true>, span: TextSpan): ClassifiedSpan[];
-    function getEncodedSemanticClassifications(typeChecker: TypeChecker, cancellationToken: CancellationToken, sourceFile: SourceFile, classifiableNames: UnderscoreEscapedMap<true>, span: TextSpan): Classifications;
-    function getSyntacticClassifications(cancellationToken: CancellationToken, sourceFile: SourceFile, span: TextSpan): ClassifiedSpan[];
-    function getEncodedSyntacticClassifications(cancellationToken: CancellationToken, sourceFile: SourceFile, span: TextSpan): Classifications;
-}
-declare namespace ts.Completions.PathCompletions {
-    interface NameAndKind {
-        readonly name: string;
-        readonly kind: ScriptElementKind.scriptElement | ScriptElementKind.directory | ScriptElementKind.externalModuleName;
-    }
-    interface PathCompletion extends NameAndKind {
-        readonly span: TextSpan | undefined;
-    }
-    function getStringLiteralCompletionsFromModuleNames(sourceFile: SourceFile, node: LiteralExpression, compilerOptions: CompilerOptions, host: LanguageServiceHost, typeChecker: TypeChecker): ReadonlyArray<PathCompletion>;
-    function getTripleSlashReferenceCompletion(sourceFile: SourceFile, position: number, compilerOptions: CompilerOptions, host: LanguageServiceHost): ReadonlyArray<PathCompletion> | undefined;
-}
-declare namespace ts.Completions {
-    type Log = (message: string) => void;
-    function getCompletionsAtPosition(host: LanguageServiceHost, program: Program, log: Log, sourceFile: SourceFile, position: number, preferences: UserPreferences, triggerCharacter: CompletionsTriggerCharacter | undefined): CompletionInfo | undefined;
-    interface CompletionEntryIdentifier {
-        name: string;
-        source?: string;
-    }
-    function getCompletionEntryDetails(program: Program, log: Log, sourceFile: SourceFile, position: number, entryId: CompletionEntryIdentifier, host: LanguageServiceHost, formatContext: formatting.FormatContext, getCanonicalFileName: GetCanonicalFileName, preferences: UserPreferences, cancellationToken: CancellationToken): CompletionEntryDetails | undefined;
-    function getCompletionEntrySymbol(program: Program, log: Log, sourceFile: SourceFile, position: number, entryId: CompletionEntryIdentifier): Symbol | undefined;
-}
-declare namespace ts.DocumentHighlights {
-    function getDocumentHighlights(program: Program, cancellationToken: CancellationToken, sourceFile: SourceFile, position: number, sourceFilesToSearch: ReadonlyArray<SourceFile>): DocumentHighlights[] | undefined;
-}
-declare namespace ts {
-    /**
-     * The document registry represents a store of SourceFile objects that can be shared between
-     * multiple LanguageService instances. A LanguageService instance holds on the SourceFile (AST)
-     * of files in the context.
-     * SourceFile objects account for most of the memory usage by the language service. Sharing
-     * the same DocumentRegistry instance between different instances of LanguageService allow
-     * for more efficient memory utilization since all projects will share at least the library
-     * file (lib.d.ts).
-     *
-     * A more advanced use of the document registry is to serialize sourceFile objects to disk
-     * and re-hydrate them when needed.
-     *
-     * To create a default DocumentRegistry, use createDocumentRegistry to create one, and pass it
-     * to all subsequent createLanguageService calls.
-     */
-    interface DocumentRegistry {
-        /**
-         * Request a stored SourceFile with a given fileName and compilationSettings.
-         * The first call to acquire will call createLanguageServiceSourceFile to generate
-         * the SourceFile if was not found in the registry.
-         *
-         * @param fileName The name of the file requested
-         * @param compilationSettings Some compilation settings like target affects the
-         * shape of a the resulting SourceFile. This allows the DocumentRegistry to store
-         * multiple copies of the same file for different compilation settings.
-         * @param scriptSnapshot Text of the file. Only used if the file was not found
-         * in the registry and a new one was created.
-         * @param version Current version of the file. Only used if the file was not found
-         * in the registry and a new one was created.
-         */
-        acquireDocument(fileName: string, compilationSettings: CompilerOptions, scriptSnapshot: IScriptSnapshot, version: string, scriptKind?: ScriptKind): SourceFile;
-        acquireDocumentWithKey(fileName: string, path: Path, compilationSettings: CompilerOptions, key: DocumentRegistryBucketKey, scriptSnapshot: IScriptSnapshot, version: string, scriptKind?: ScriptKind): SourceFile;
-        /**
-         * Request an updated version of an already existing SourceFile with a given fileName
-         * and compilationSettings. The update will in-turn call updateLanguageServiceSourceFile
-         * to get an updated SourceFile.
-         *
-         * @param fileName The name of the file requested
-         * @param compilationSettings Some compilation settings like target affects the
-         * shape of a the resulting SourceFile. This allows the DocumentRegistry to store
-         * multiple copies of the same file for different compilation settings.
-         * @param scriptSnapshot Text of the file.
-         * @param version Current version of the file.
-         */
-        updateDocument(fileName: string, compilationSettings: CompilerOptions, scriptSnapshot: IScriptSnapshot, version: string, scriptKind?: ScriptKind): SourceFile;
-        updateDocumentWithKey(fileName: string, path: Path, compilationSettings: CompilerOptions, key: DocumentRegistryBucketKey, scriptSnapshot: IScriptSnapshot, version: string, scriptKind?: ScriptKind): SourceFile;
-        getKeyForCompilationSettings(settings: CompilerOptions): DocumentRegistryBucketKey;
-        /**
-         * Informs the DocumentRegistry that a file is not needed any longer.
-         *
-         * Note: It is not allowed to call release on a SourceFile that was not acquired from
-         * this registry originally.
-         *
-         * @param fileName The name of the file to be released
-         * @param compilationSettings The compilation settings used to acquire the file
-         */
-        releaseDocument(fileName: string, compilationSettings: CompilerOptions): void;
-        releaseDocumentWithKey(path: Path, key: DocumentRegistryBucketKey): void;
-        getLanguageServiceRefCounts(path: Path): [string, number | undefined][];
-        reportStats(): string;
-    }
-    interface ExternalDocumentCache {
-        setDocument(key: DocumentRegistryBucketKey, path: Path, sourceFile: SourceFile): void;
-        getDocument(key: DocumentRegistryBucketKey, path: Path): SourceFile | undefined;
-    }
-    type DocumentRegistryBucketKey = string & {
-        __bucketKey: any;
-    };
-    function createDocumentRegistry(useCaseSensitiveFileNames?: boolean, currentDirectory?: string): DocumentRegistry;
-    function createDocumentRegistryInternal(useCaseSensitiveFileNames?: boolean, currentDirectory?: string, externalCache?: ExternalDocumentCache): DocumentRegistry;
-}
-declare namespace ts.FindAllReferences {
-    interface ImportsResult {
-        /** For every import of the symbol, the location and local symbol for the import. */
-        importSearches: ReadonlyArray<[Identifier, Symbol]>;
-        /** For rename imports/exports `{ foo as bar }`, `foo` is not a local, so it may be added as a reference immediately without further searching. */
-        singleReferences: ReadonlyArray<Identifier | StringLiteral>;
-        /** List of source files that may (or may not) use the symbol via a namespace. (For UMD modules this is every file.) */
-        indirectUsers: ReadonlyArray<SourceFile>;
-    }
-    type ImportTracker = (exportSymbol: Symbol, exportInfo: ExportInfo, isForRename: boolean) => ImportsResult;
-    /** Creates the imports map and returns an ImportTracker that uses it. Call this lazily to avoid calling `getDirectImportsMap` unnecessarily.  */
-    function createImportTracker(sourceFiles: ReadonlyArray<SourceFile>, sourceFilesSet: ReadonlyMap<true>, checker: TypeChecker, cancellationToken: CancellationToken): ImportTracker;
-    /** Info about an exported symbol to perform recursive search on. */
-    interface ExportInfo {
-        exportingModuleSymbol: Symbol;
-        exportKind: ExportKind;
-    }
-    enum ExportKind {
-        Named = 0,
-        Default = 1,
-        ExportEquals = 2
-    }
-    enum ImportExport {
-        Import = 0,
-        Export = 1
-    }
-    type ModuleReference = {
-        kind: "import";
-        literal: StringLiteralLike;
-    }
-    /** <reference path> or <reference types> */
-     | {
-        kind: "reference";
-        referencingFile: SourceFile;
-        ref: FileReference;
-    };
-    function findModuleReferences(program: Program, sourceFiles: ReadonlyArray<SourceFile>, searchModuleSymbol: Symbol): ModuleReference[];
-    interface ImportedSymbol {
-        kind: ImportExport.Import;
-        symbol: Symbol;
-        isNamedImport: boolean;
-    }
-    interface ExportedSymbol {
-        kind: ImportExport.Export;
-        symbol: Symbol;
-        exportInfo: ExportInfo;
-    }
-    /**
-     * Given a local reference, we might notice that it's an import/export and recursively search for references of that.
-     * If at an import, look locally for the symbol it imports.
-     * If an an export, look for all imports of it.
-     * This doesn't handle export specifiers; that is done in `getReferencesAtExportSpecifier`.
-     * @param comingFromExport If we are doing a search for all exports, don't bother looking backwards for the imported symbol, since that's the reason we're here.
-     */
-    function getImportOrExportSymbol(node: Node, symbol: Symbol, checker: TypeChecker, comingFromExport: boolean): ImportedSymbol | ExportedSymbol | undefined;
-    function getExportInfo(exportSymbol: Symbol, exportKind: ExportKind, checker: TypeChecker): ExportInfo | undefined;
-}
-declare namespace ts.FindAllReferences {
-    interface SymbolAndEntries {
-        definition: Definition | undefined;
-        references: Entry[];
-    }
-    type Definition = {
-        type: "symbol";
-        symbol: Symbol;
-    } | {
-        type: "label";
-        node: Identifier;
-    } | {
-        type: "keyword";
-        node: Node;
-    } | {
-        type: "this";
-        node: Node;
-    } | {
-        type: "string";
-        node: StringLiteral;
-    };
-    type Entry = NodeEntry | SpanEntry;
-    interface NodeEntry {
-        type: "node";
-        node: Node;
-        isInString?: true;
-    }
-    interface SpanEntry {
-        type: "span";
-        fileName: string;
-        textSpan: TextSpan;
-    }
-    function nodeEntry(node: Node, isInString?: true): NodeEntry;
-    interface Options {
-        readonly findInStrings?: boolean;
-        readonly findInComments?: boolean;
-        /**
-         * True if we are renaming the symbol.
-         * If so, we will find fewer references -- if it is referenced by several different names, we sill only find references for the original name.
-         */
-        readonly isForRename?: boolean;
-        /** True if we are searching for implementations. We will have a different method of adding references if so. */
-        readonly implementations?: boolean;
-    }
-    function findReferencedSymbols(program: Program, cancellationToken: CancellationToken, sourceFiles: ReadonlyArray<SourceFile>, sourceFile: SourceFile, position: number): ReferencedSymbol[] | undefined;
-    function getImplementationsAtPosition(program: Program, cancellationToken: CancellationToken, sourceFiles: ReadonlyArray<SourceFile>, sourceFile: SourceFile, position: number): ImplementationLocation[] | undefined;
-    function findReferencedEntries(program: Program, cancellationToken: CancellationToken, sourceFiles: ReadonlyArray<SourceFile>, sourceFile: SourceFile, position: number, options?: Options): ReferenceEntry[] | undefined;
-    function getReferenceEntriesForNode(position: number, node: Node, program: Program, sourceFiles: ReadonlyArray<SourceFile>, cancellationToken: CancellationToken, options?: Options, sourceFilesSet?: ReadonlyMap<true>): Entry[] | undefined;
-    function toHighlightSpan(entry: Entry): {
-        fileName: string;
-        span: HighlightSpan;
-    };
-}
-/** Encapsulates the core find-all-references algorithm. */
-declare namespace ts.FindAllReferences.Core {
-    /** Core find-all-references algorithm. Handles special cases before delegating to `getReferencedSymbolsForSymbol`. */
-    function getReferencedSymbolsForNode(position: number, node: Node, program: Program, sourceFiles: ReadonlyArray<SourceFile>, cancellationToken: CancellationToken, options?: Options, sourceFilesSet?: ReadonlyMap<true>): SymbolAndEntries[] | undefined;
-    /** Used as a quick check for whether a symbol is used at all in a file (besides its definition). */
-    function isSymbolReferencedInFile(definition: Identifier, checker: TypeChecker, sourceFile: SourceFile): boolean;
-    function eachSymbolReferenceInFile<T>(definition: Identifier, checker: TypeChecker, sourceFile: SourceFile, cb: (token: Identifier) => T): T | undefined;
-    /**
-     * Given an initial searchMeaning, extracted from a location, widen the search scope based on the declarations
-     * of the corresponding symbol. e.g. if we are searching for "Foo" in value position, but "Foo" references a class
-     * then we need to widen the search to include type positions as well.
-     * On the contrary, if we are searching for "Bar" in type position and we trace bar to an interface, and an uninstantiated
-     * module, we want to keep the search limited to only types, as the two declarations (interface and uninstantiated module)
-     * do not intersect in any of the three spaces.
-     */
-    function getIntersectingMeaningFromDeclarations(node: Node, symbol: Symbol): SemanticMeaning;
-    function getReferenceEntriesForShorthandPropertyAssignment(node: Node, checker: TypeChecker, addReference: (node: Node) => void): void;
-}
-declare namespace ts {
-    function getEditsForFileRename(program: Program, oldFileOrDirPath: string, newFileOrDirPath: string, host: LanguageServiceHost, formatContext: formatting.FormatContext, preferences: UserPreferences): ReadonlyArray<FileTextChanges>;
-}
-declare namespace ts.GoToDefinition {
-    function getDefinitionAtPosition(program: Program, sourceFile: SourceFile, position: number): DefinitionInfo[] | undefined;
-    function getReferenceAtPosition(sourceFile: SourceFile, position: number, program: Program): {
-        fileName: string;
-        file: SourceFile;
-    } | undefined;
-    function getTypeDefinitionAtPosition(typeChecker: TypeChecker, sourceFile: SourceFile, position: number): DefinitionInfo[] | undefined;
-    function getDefinitionAndBoundSpan(program: Program, sourceFile: SourceFile, position: number): DefinitionInfoAndBoundSpan | undefined;
-    function findReferenceInPosition(refs: ReadonlyArray<FileReference>, pos: number): FileReference | undefined;
-}
-declare namespace ts.JsDoc {
-    function getJsDocCommentsFromDeclarations(declarations: ReadonlyArray<Declaration>): SymbolDisplayPart[];
-    function getJsDocTagsFromDeclarations(declarations?: Declaration[]): JSDocTagInfo[];
-    function getJSDocTagNameCompletions(): CompletionEntry[];
-    const getJSDocTagNameCompletionDetails: typeof getJSDocTagCompletionDetails;
-    function getJSDocTagCompletions(): CompletionEntry[];
-    function getJSDocTagCompletionDetails(name: string): CompletionEntryDetails;
-    function getJSDocParameterNameCompletions(tag: JSDocParameterTag): CompletionEntry[];
-    function getJSDocParameterNameCompletionDetails(name: string): CompletionEntryDetails;
-    /**
-     * Checks if position points to a valid position to add JSDoc comments, and if so,
-     * returns the appropriate template. Otherwise returns an empty string.
-     * Valid positions are
-     *      - outside of comments, statements, and expressions, and
-     *      - preceding a:
-     *          - function/constructor/method declaration
-     *          - class declarations
-     *          - variable statements
-     *          - namespace declarations
-     *          - interface declarations
-     *          - method signatures
-     *          - type alias declarations
-     *
-     * Hosts should ideally check that:
-     * - The line is all whitespace up to 'position' before performing the insertion.
-     * - If the keystroke sequence "/\*\*" induced the call, we also check that the next
-     * non-whitespace character is '*', which (approximately) indicates whether we added
-     * the second '*' to complete an existing (JSDoc) comment.
-     * @param fileName The file in which to perform the check.
-     * @param position The (character-indexed) position in the file where the check should
-     * be performed.
-     */
-    function getDocCommentTemplateAtPosition(newLine: string, sourceFile: SourceFile, position: number): TextInsertion | undefined;
-}
-declare namespace ts.NavigateTo {
-    function getNavigateToItems(sourceFiles: ReadonlyArray<SourceFile>, checker: TypeChecker, cancellationToken: CancellationToken, searchValue: string, maxResultCount: number | undefined, excludeDtsFiles: boolean): NavigateToItem[];
-}
-declare namespace ts.NavigationBar {
-    function getNavigationBarItems(sourceFile: SourceFile, cancellationToken: CancellationToken): NavigationBarItem[];
-    function getNavigationTree(sourceFile: SourceFile, cancellationToken: CancellationToken): NavigationTree;
-}
-declare namespace ts.OrganizeImports {
-    /**
-     * Organize imports by:
-     *   1) Removing unused imports
-     *   2) Coalescing imports from the same module
-     *   3) Sorting imports
-     */
-    function organizeImports(sourceFile: SourceFile, formatContext: formatting.FormatContext, host: LanguageServiceHost, program: Program, _preferences: UserPreferences): FileTextChanges[];
-    /**
-     * @param importGroup a list of ImportDeclarations, all with the same module name.
-     */
-    function coalesceImports(importGroup: ReadonlyArray<ImportDeclaration>): ReadonlyArray<ImportDeclaration>;
-    /**
-     * @param exportGroup a list of ExportDeclarations, all with the same module name.
-     */
-    function coalesceExports(exportGroup: ReadonlyArray<ExportDeclaration>): ReadonlyArray<ExportDeclaration>;
-    function compareModuleSpecifiers(m1: Expression, m2: Expression): Comparison;
-}
-declare namespace ts.OutliningElementsCollector {
-    function collectElements(sourceFile: SourceFile, cancellationToken: CancellationToken): OutliningSpan[];
-}
-declare namespace ts {
-    enum PatternMatchKind {
-        exact = 0,
-        prefix = 1,
-        substring = 2,
-        camelCase = 3
-    }
-    interface PatternMatch {
-        kind: PatternMatchKind;
-        isCaseSensitive: boolean;
-    }
-    interface PatternMatcher {
-        getMatchForLastSegmentOfPattern(candidate: string): PatternMatch | undefined;
-        getFullMatch(candidateContainers: ReadonlyArray<string>, candidate: string): PatternMatch | undefined;
-        patternContainsDots: boolean;
-    }
-    function createPatternMatcher(pattern: string): PatternMatcher | undefined;
-    function breakIntoCharacterSpans(identifier: string): TextSpan[];
-    function breakIntoWordSpans(identifier: string): TextSpan[];
-}
-declare namespace ts {
-    function preProcessFile(sourceText: string, readImportFiles?: boolean, detectJavaScriptImports?: boolean): PreProcessedFileInfo;
-}
-declare namespace ts.Rename {
-    function getRenameInfo(typeChecker: TypeChecker, defaultLibFileName: string, getCanonicalFileName: GetCanonicalFileName, sourceFile: SourceFile, position: number): RenameInfo;
-}
-declare namespace ts.SignatureHelp {
-    function getSignatureHelpItems(program: Program, sourceFile: SourceFile, position: number, cancellationToken: CancellationToken): SignatureHelpItems | undefined;
-    interface ArgumentInfoForCompletions {
-        readonly invocation: CallLikeExpression;
-        readonly argumentIndex: number;
-        readonly argumentCount: number;
-    }
-    function getArgumentInfoForCompletions(node: Node, position: number, sourceFile: SourceFile): ArgumentInfoForCompletions | undefined;
-}
-declare namespace ts {
-    function computeSuggestionDiagnostics(sourceFile: SourceFile, program: Program, cancellationToken: CancellationToken): DiagnosticWithLocation[];
-}
-declare namespace ts.SymbolDisplay {
-    function getSymbolKind(typeChecker: TypeChecker, symbol: Symbol, location: Node): ScriptElementKind;
-    function getSymbolModifiers(symbol: Symbol): string;
-    interface SymbolDisplayPartsDocumentationAndSymbolKind {
-        displayParts: SymbolDisplayPart[];
-        documentation: SymbolDisplayPart[];
-        symbolKind: ScriptElementKind;
-        tags: JSDocTagInfo[] | undefined;
-    }
-    function getSymbolDisplayPartsDocumentationAndSymbolKind(typeChecker: TypeChecker, symbol: Symbol, sourceFile: SourceFile, enclosingDeclaration: Node | undefined, location: Node, semanticMeaning?: SemanticMeaning, alias?: Symbol): SymbolDisplayPartsDocumentationAndSymbolKind;
-}
-declare namespace ts {
-    interface TranspileOptions {
-        compilerOptions?: CompilerOptions;
-        fileName?: string;
-        reportDiagnostics?: boolean;
-        moduleName?: string;
-        renamedDependencies?: MapLike<string>;
-        transformers?: CustomTransformers;
-    }
-    interface TranspileOutput {
-        outputText: string;
-        diagnostics?: Diagnostic[];
-        sourceMapText?: string;
-    }
-    function transpileModule(input: string, transpileOptions: TranspileOptions): TranspileOutput;
-    function transpile(input: string, compilerOptions?: CompilerOptions, fileName?: string, diagnostics?: Diagnostic[], moduleName?: string): string;
-    /** JS users may pass in string values for enum compiler options (such as ModuleKind), so convert. */
-    function fixupCompilerOptions(options: CompilerOptions, diagnostics: Diagnostic[]): CompilerOptions;
-}
-declare namespace ts.formatting {
-    enum FormattingRequestKind {
-        FormatDocument = 0,
-        FormatSelection = 1,
-        FormatOnEnter = 2,
-        FormatOnSemicolon = 3,
-        FormatOnOpeningCurlyBrace = 4,
-        FormatOnClosingCurlyBrace = 5
-    }
-    class FormattingContext {
-        readonly sourceFile: SourceFileLike;
-        formattingRequestKind: FormattingRequestKind;
-        options: FormatCodeSettings;
-        currentTokenSpan: TextRangeWithKind;
-        nextTokenSpan: TextRangeWithKind;
-        contextNode: Node;
-        currentTokenParent: Node;
-        nextTokenParent: Node;
-        private contextNodeAllOnSameLine;
-        private nextNodeAllOnSameLine;
-        private tokensAreOnSameLine;
-        private contextNodeBlockIsOnOneLine;
-        private nextNodeBlockIsOnOneLine;
-        constructor(sourceFile: SourceFileLike, formattingRequestKind: FormattingRequestKind, options: FormatCodeSettings);
-        updateContext(currentRange: TextRangeWithKind, currentTokenParent: Node, nextRange: TextRangeWithKind, nextTokenParent: Node, commonParent: Node): void;
-        ContextNodeAllOnSameLine(): boolean;
-        NextNodeAllOnSameLine(): boolean;
-        TokensAreOnSameLine(): boolean;
-        ContextNodeBlockIsOnOneLine(): boolean;
-        NextNodeBlockIsOnOneLine(): boolean;
-        private NodeIsOnOneLine;
-        private BlockIsOnOneLine;
-    }
-}
-declare namespace ts.formatting {
-    interface FormattingScanner {
-        advance(): void;
-        isOnToken(): boolean;
-        readTokenInfo(n: Node): TokenInfo;
-        getCurrentLeadingTrivia(): TextRangeWithKind[] | undefined;
-        lastTrailingTriviaWasNewLine(): boolean;
-        skipToEndOf(node: Node): void;
-    }
-    function getFormattingScanner<T>(text: string, languageVariant: LanguageVariant, startPos: number, endPos: number, cb: (scanner: FormattingScanner) => T): T;
-}
-declare namespace ts.formatting {
-    interface Rule {
-        readonly debugName: string;
-        readonly context: ReadonlyArray<ContextPredicate>;
-        readonly action: RuleAction;
-        readonly flags: RuleFlags;
-    }
-    type ContextPredicate = (context: FormattingContext) => boolean;
-    const anyContext: ReadonlyArray<ContextPredicate>;
-    enum RuleAction {
-        Ignore = 1,
-        Space = 2,
-        NewLine = 4,
-        Delete = 8
-    }
-    enum RuleFlags {
-        None = 0,
-        CanDeleteNewLines = 1
-    }
-    interface TokenRange {
-        readonly tokens: ReadonlyArray<SyntaxKind>;
-        readonly isSpecific: boolean;
-    }
-}
-declare namespace ts.formatting {
-    interface RuleSpec {
-        readonly leftTokenRange: TokenRange;
-        readonly rightTokenRange: TokenRange;
-        readonly rule: Rule;
-    }
-    function getAllRules(): RuleSpec[];
-}
-declare namespace ts.formatting {
-    function getFormatContext(options: FormatCodeSettings): FormatContext;
-    type RulesMap = (context: FormattingContext) => Rule | undefined;
-}
-declare namespace ts.formatting {
-    interface FormatContext {
-        readonly options: FormatCodeSettings;
-        readonly getRule: RulesMap;
-    }
-    interface TextRangeWithKind extends TextRange {
-        kind: SyntaxKind;
-    }
-    interface TextRangeWithTriviaKind extends TextRange {
-        kind: TriviaKind;
-    }
-    interface TokenInfo {
-        leadingTrivia: TextRangeWithTriviaKind[] | undefined;
-        token: TextRangeWithKind;
-        trailingTrivia: TextRangeWithTriviaKind[] | undefined;
-    }
-    function formatOnEnter(position: number, sourceFile: SourceFile, formatContext: FormatContext): TextChange[];
-    function formatOnSemicolon(position: number, sourceFile: SourceFile, formatContext: FormatContext): TextChange[];
-    function formatOnOpeningCurly(position: number, sourceFile: SourceFile, formatContext: FormatContext): TextChange[];
-    function formatOnClosingCurly(position: number, sourceFile: SourceFile, formatContext: FormatContext): TextChange[];
-    function formatDocument(sourceFile: SourceFile, formatContext: FormatContext): TextChange[];
-    function formatSelection(start: number, end: number, sourceFile: SourceFile, formatContext: FormatContext): TextChange[];
-    function formatNodeGivenIndentation(node: Node, sourceFileLike: SourceFileLike, languageVariant: LanguageVariant, initialIndentation: number, delta: number, formatContext: FormatContext): TextChange[];
-    /**
-     * @param precedingToken pass `null` if preceding token was already computed and result was `undefined`.
-     */
-    function getRangeOfEnclosingComment(sourceFile: SourceFile, position: number, onlyMultiLine: boolean, precedingToken?: Node | null, // tslint:disable-line:no-null-keyword
-    tokenAtPosition?: Node, predicate?: (c: CommentRange) => boolean): CommentRange | undefined;
-    function getIndentationString(indentation: number, options: EditorSettings): string;
-}
-declare namespace ts.formatting {
-    namespace SmartIndenter {
-        /**
-         * @param assumeNewLineBeforeCloseBrace
-         * `false` when called on text from a real source file.
-         * `true` when we need to assume `position` is on a newline.
-         *
-         * This is useful for codefixes. Consider
-         * ```
-         * function f() {
-         * |}
-         * ```
-         * with `position` at `|`.
-         *
-         * When inserting some text after an open brace, we would like to get indentation as if a newline was already there.
-         * By default indentation at `position` will be 0 so 'assumeNewLineBeforeCloseBrace' overrides this behavior.
-         */
-        function getIndentation(position: number, sourceFile: SourceFile, options: EditorSettings, assumeNewLineBeforeCloseBrace?: boolean): number;
-        function getIndentationForNode(n: Node, ignoreActualIndentationRange: TextRange, sourceFile: SourceFile, options: EditorSettings): number;
-        function getBaseIndentation(options: EditorSettings): number;
-        function isArgumentAndStartLineOverlapsExpressionBeingCalled(parent: Node, child: Node, childStartLine: number, sourceFile: SourceFileLike): boolean;
-        function childStartsOnTheSameLineWithElseInIfStatement(parent: Node, child: TextRangeWithKind, childStartLine: number, sourceFile: SourceFileLike): boolean;
-        function getContainingList(node: Node, sourceFile: SourceFile): NodeArray<Node> | undefined;
-        /**
-         * Character is the actual index of the character since the beginning of the line.
-         * Column - position of the character after expanding tabs to spaces.
-         * "0\t2$"
-         * value of 'character' for '$' is 3
-         * value of 'column' for '$' is 6 (assuming that tab size is 4)
-         */
-        function findFirstNonWhitespaceCharacterAndColumn(startPos: number, endPos: number, sourceFile: SourceFileLike, options: EditorSettings): {
-            column: number;
-            character: number;
-        };
-        function findFirstNonWhitespaceColumn(startPos: number, endPos: number, sourceFile: SourceFileLike, options: EditorSettings): number;
-        function nodeWillIndentChild(settings: FormatCodeSettings, parent: TextRangeWithKind, child: TextRangeWithKind | undefined, sourceFile: SourceFileLike | undefined, indentByDefault: boolean): boolean;
-        /**
-         * True when the parent node should indent the given child by an explicit rule.
-         * @param isNextChild If true, we are judging indent of a hypothetical child *after* this one, not the current child.
-         */
-        function shouldIndentChildNode(settings: FormatCodeSettings, parent: TextRangeWithKind, child?: Node, sourceFile?: SourceFileLike, isNextChild?: boolean): boolean;
-    }
-}
-declare namespace ts.textChanges {
-    interface ConfigurableStart {
-        /** True to use getStart() (NB, not getFullStart()) without adjustment. */
-        useNonAdjustedStartPosition?: boolean;
-    }
-    interface ConfigurableEnd {
-        /** True to use getEnd() without adjustment. */
-        useNonAdjustedEndPosition?: boolean;
-    }
-    enum Position {
-        FullStart = 0,
-        Start = 1
-    }
-    /**
-     * Usually node.pos points to a position immediately after the previous token.
-     * If this position is used as a beginning of the span to remove - it might lead to removing the trailing trivia of the previous node, i.e:
-     * const x; // this is x
-     *        ^ - pos for the next variable declaration will point here
-     * const y; // this is y
-     *        ^ - end for previous variable declaration
-     * Usually leading trivia of the variable declaration 'y' should not include trailing trivia (whitespace, comment 'this is x' and newline) from the preceding
-     * variable declaration and trailing trivia for 'y' should include (whitespace, comment 'this is y', newline).
-     * By default when removing nodes we adjust start and end positions to respect specification of the trivia above.
-     * If pos\end should be interpreted literally 'useNonAdjustedStartPosition' or 'useNonAdjustedEndPosition' should be set to true
-     */
-    interface ConfigurableStartEnd extends ConfigurableStart, ConfigurableEnd {
-    }
-    const useNonAdjustedPositions: ConfigurableStartEnd;
-    interface InsertNodeOptions {
-        /**
-         * Text to be inserted before the new node
-         */
-        prefix?: string;
-        /**
-         * Text to be inserted after the new node
-         */
-        suffix?: string;
-        /**
-         * Text of inserted node will be formatted with this indentation, otherwise indentation will be inferred from the old node
-         */
-        indentation?: number;
-        /**
-         * Text of inserted node will be formatted with this delta, otherwise delta will be inferred from the new node kind
-         */
-        delta?: number;
-        /**
-         * Do not trim leading white spaces in the edit range
-         */
-        preserveLeadingWhitespace?: boolean;
-    }
-    interface ReplaceWithMultipleNodesOptions extends InsertNodeOptions {
-        readonly joiner?: string;
-    }
-    interface ChangeNodeOptions extends ConfigurableStartEnd, InsertNodeOptions {
-    }
-    interface TextChangesContext {
-        host: LanguageServiceHost;
-        formatContext: formatting.FormatContext;
-    }
-    type TypeAnnotatable = SignatureDeclaration | VariableDeclaration | ParameterDeclaration | PropertyDeclaration | PropertySignature;
-    class ChangeTracker {
-        private readonly newLineCharacter;
-        private readonly formatContext;
-        private readonly changes;
-        private readonly newFiles;
-        private readonly deletedNodesInLists;
-        private readonly classesWithNodesInsertedAtStart;
-        static fromContext(context: TextChangesContext): ChangeTracker;
-        static with(context: TextChangesContext, cb: (tracker: ChangeTracker) => void): FileTextChanges[];
-        /** Public for tests only. Other callers should use `ChangeTracker.with`. */
-        constructor(newLineCharacter: string, formatContext: formatting.FormatContext);
-        deleteRange(sourceFile: SourceFile, range: TextRange): this;
-        /** Warning: This deletes comments too. See `copyComments` in `convertFunctionToEs6Class`. */
-        deleteNode(sourceFile: SourceFile, node: Node, options?: ConfigurableStartEnd): this;
-        deleteNodeRange(sourceFile: SourceFile, startNode: Node, endNode: Node, options?: ConfigurableStartEnd): this;
-        deleteNodeRangeExcludingEnd(sourceFile: SourceFile, startNode: Node, afterEndNode: Node | undefined, options?: ConfigurableStartEnd): void;
-        deleteNodeInList(sourceFile: SourceFile, node: Node): this;
-        replaceRange(sourceFile: SourceFile, range: TextRange, newNode: Node, options?: InsertNodeOptions): this;
-        replaceNode(sourceFile: SourceFile, oldNode: Node, newNode: Node, options?: ChangeNodeOptions): this;
-        replaceNodeRange(sourceFile: SourceFile, startNode: Node, endNode: Node, newNode: Node, options?: ChangeNodeOptions): void;
-        private replaceRangeWithNodes;
-        replaceNodeWithNodes(sourceFile: SourceFile, oldNode: Node, newNodes: ReadonlyArray<Node>, options?: ChangeNodeOptions): this;
-        replaceNodeRangeWithNodes(sourceFile: SourceFile, startNode: Node, endNode: Node, newNodes: ReadonlyArray<Node>, options?: ReplaceWithMultipleNodesOptions & ConfigurableStartEnd): this;
-        private nextCommaToken;
-        replacePropertyAssignment(sourceFile: SourceFile, oldNode: PropertyAssignment, newNode: PropertyAssignment): this;
-        private insertNodeAt;
-        private insertNodesAt;
-        insertNodeAtTopOfFile(sourceFile: SourceFile, newNode: Statement, blankLineBetween: boolean): void;
-        insertNodeBefore(sourceFile: SourceFile, before: Node, newNode: Node, blankLineBetween?: boolean): void;
-        insertModifierBefore(sourceFile: SourceFile, modifier: SyntaxKind, before: Node): void;
-        insertCommentBeforeLine(sourceFile: SourceFile, lineNumber: number, position: number, commentText: string): void;
-        replaceRangeWithText(sourceFile: SourceFile, range: TextRange, text: string): void;
-        private insertText;
-        /** Prefer this over replacing a node with another that has a type annotation, as it avoids reformatting the other parts of the node. */
-        tryInsertTypeAnnotation(sourceFile: SourceFile, node: TypeAnnotatable, type: TypeNode): void;
-        insertTypeParameters(sourceFile: SourceFile, node: SignatureDeclaration, typeParameters: ReadonlyArray<TypeParameterDeclaration>): void;
-        private getOptionsForInsertNodeBefore;
-        insertNodeAtConstructorStart(sourceFile: SourceFile, ctr: ConstructorDeclaration, newStatement: Statement): void;
-        insertNodeAtConstructorEnd(sourceFile: SourceFile, ctr: ConstructorDeclaration, newStatement: Statement): void;
-        private replaceConstructorBody;
-        insertNodeAtEndOfScope(sourceFile: SourceFile, scope: Node, newNode: Node): void;
-        insertNodeAtClassStart(sourceFile: SourceFile, cls: ClassLikeDeclaration, newElement: ClassElement): void;
-        private getInsertNodeAtClassStartPrefixSuffix;
-        insertNodeAfterComma(sourceFile: SourceFile, after: Node, newNode: Node): void;
-        insertNodeAfter(sourceFile: SourceFile, after: Node, newNode: Node): void;
-        insertNodesAfter(sourceFile: SourceFile, after: Node, newNodes: ReadonlyArray<Node>): void;
-        private insertNodeAfterWorker;
-        private getInsertNodeAfterOptions;
-        private getInsertNodeAfterOptionsWorker;
-        insertName(sourceFile: SourceFile, node: FunctionExpression | ClassExpression | ArrowFunction, name: string): void;
-        insertExportModifier(sourceFile: SourceFile, node: DeclarationStatement | VariableStatement): void;
-        /**
-         * This function should be used to insert nodes in lists when nodes don't carry separators as the part of the node range,
-         * i.e. arguments in arguments lists, parameters in parameter lists etc.
-         * Note that separators are part of the node in statements and class elements.
-         */
-        insertNodeInListAfter(sourceFile: SourceFile, after: Node, newNode: Node, containingList?: NodeArray<Node> | undefined): this;
-        private finishClassesWithNodesInsertedAtStart;
-        private finishTrailingCommaAfterDeletingNodesInList;
-        /**
-         * Note: after calling this, the TextChanges object must be discarded!
-         * @param validate only for tests
-         *    The reason we must validate as part of this method is that `getNonFormattedText` changes the node's positions,
-         *    so we can only call this once and can't get the non-formatted text separately.
-         */
-        getChanges(validate?: ValidateNonFormattedText): FileTextChanges[];
-        createNewFile(oldFile: SourceFile, fileName: string, statements: ReadonlyArray<Statement>): void;
-    }
-    type ValidateNonFormattedText = (node: Node, text: string) => void;
-    function applyChanges(text: string, changes: TextChange[]): string;
-    function isValidLocationToAddComment(sourceFile: SourceFile, position: number): boolean;
-}
-declare namespace ts {
-    interface CodeFixRegistration {
-        errorCodes: number[];
-        getCodeActions(context: CodeFixContext): CodeFixAction[] | undefined;
-        fixIds?: string[];
-        getAllCodeActions?(context: CodeFixAllContext): CombinedCodeActions;
-    }
-    interface CodeFixContextBase extends textChanges.TextChangesContext {
-        sourceFile: SourceFile;
-        program: Program;
-        cancellationToken: CancellationToken;
-        preferences: UserPreferences;
-    }
-    interface CodeFixAllContext extends CodeFixContextBase {
-        fixId: {};
-    }
-    interface CodeFixContext extends CodeFixContextBase {
-        errorCode: number;
-        span: TextSpan;
-    }
-    namespace codefix {
-        type DiagnosticAndArguments = DiagnosticMessage | [DiagnosticMessage, string] | [DiagnosticMessage, string, string];
-        function createCodeFixActionNoFixId(fixName: string, changes: FileTextChanges[], description: DiagnosticAndArguments): CodeFixAction;
-        function createCodeFixAction(fixName: string, changes: FileTextChanges[], description: DiagnosticAndArguments, fixId: {}, fixAllDescription: DiagnosticAndArguments, command?: CodeActionCommand): CodeFixAction;
-        function registerCodeFix(reg: CodeFixRegistration): void;
-        function getSupportedErrorCodes(): string[];
-        function getFixes(context: CodeFixContext): CodeFixAction[];
-        function getAllFixes(context: CodeFixAllContext): CombinedCodeActions;
-        function createFileTextChanges(fileName: string, textChanges: TextChange[]): FileTextChanges;
-        function codeFixAll(context: CodeFixAllContext, errorCodes: number[], use: (changes: textChanges.ChangeTracker, error: DiagnosticWithLocation, commands: Push<CodeActionCommand>) => void): CombinedCodeActions;
-    }
-}
-declare namespace ts {
-    interface Refactor {
-        /** Compute the associated code actions */
-        getEditsForAction(context: RefactorContext, actionName: string): RefactorEditInfo | undefined;
-        /** Compute (quickly) which actions are available here */
-        getAvailableActions(context: RefactorContext): ApplicableRefactorInfo[] | undefined;
-    }
-    interface RefactorContext extends textChanges.TextChangesContext {
-        file: SourceFile;
-        startPosition: number;
-        endPosition?: number;
-        program: Program;
-        cancellationToken?: CancellationToken;
-        preferences: UserPreferences;
-    }
-    namespace refactor {
-        /** @param name An unique code associated with each refactor. Does not have to be human-readable. */
-        function registerRefactor(name: string, refactor: Refactor): void;
-        function getApplicableRefactors(context: RefactorContext): ApplicableRefactorInfo[];
-        function getEditsForRefactor(context: RefactorContext, refactorName: string, actionName: string): RefactorEditInfo | undefined;
-    }
-    function getRefactorContextSpan({ startPosition, endPosition }: RefactorContext): TextSpan;
-}
-declare namespace ts.codefix {
-}
-declare namespace ts.codefix {
-    type DeclarationWithType = FunctionLikeDeclaration | VariableDeclaration | PropertySignature | PropertyDeclaration;
-    function parameterShouldGetTypeFromJSDoc(node: Node): node is DeclarationWithType;
-}
-declare namespace ts.codefix {
-}
-declare namespace ts.codefix {
-}
-declare namespace ts.codefix {
-}
-declare namespace ts.codefix {
-}
-declare namespace ts.codefix {
-    function getImportCompletionAction(exportedSymbol: Symbol, moduleSymbol: Symbol, sourceFile: SourceFile, symbolName: string, host: LanguageServiceHost, program: Program, checker: TypeChecker, compilerOptions: CompilerOptions, allSourceFiles: ReadonlyArray<SourceFile>, formatContext: formatting.FormatContext, getCanonicalFileName: GetCanonicalFileName, symbolToken: Node | undefined, preferences: UserPreferences): {
-        readonly moduleSpecifier: string;
-        readonly codeAction: CodeAction;
-    };
-    function forEachExternalModuleToImportFrom(checker: TypeChecker, from: SourceFile, allSourceFiles: ReadonlyArray<SourceFile>, cb: (module: Symbol) => void): void;
-    function moduleSymbolToValidIdentifier(moduleSymbol: Symbol, target: ScriptTarget): string;
-    function moduleSpecifierToValidIdentifier(moduleSpecifier: string, target: ScriptTarget): string;
-}
-declare namespace ts.codefix {
-}
-declare namespace ts.codefix {
-}
-declare namespace ts.codefix {
-}
-declare namespace ts.codefix {
-}
-declare namespace ts.codefix {
-}
-declare namespace ts.codefix {
-}
-declare namespace ts.codefix {
-}
-declare namespace ts.codefix {
-}
-declare namespace ts.codefix {
-}
-declare namespace ts.codefix {
-}
-declare namespace ts.codefix {
-}
-declare namespace ts.codefix {
-}
-declare namespace ts.codefix {
-}
-declare namespace ts.codefix {
-}
-declare namespace ts.codefix {
-    /**
-     * Finds members of the resolved type that are missing in the class pointed to by class decl
-     * and generates source code for the missing members.
-     * @param possiblyMissingSymbols The collection of symbols to filter and then get insertions for.
-     * @returns Empty string iff there are no member insertions.
-     */
-    function createMissingMemberNodes(classDeclaration: ClassLikeDeclaration, possiblyMissingSymbols: ReadonlyArray<Symbol>, checker: TypeChecker, preferences: UserPreferences, out: (node: ClassElement) => void): void;
-    function createMethodFromCallExpression({ typeArguments, arguments: args, parent: parent }: CallExpression, methodName: string, inJs: boolean, makeStatic: boolean, preferences: UserPreferences): MethodDeclaration;
-}
-declare namespace ts.codefix {
-}
-declare namespace ts.codefix {
-}
-declare namespace ts.codefix {
-}
-declare namespace ts.codefix {
-}
-declare namespace ts.codefix {
-}
-declare namespace ts.codefix {
-}
-declare namespace ts.codefix {
-}
-declare namespace ts.refactor.generateGetAccessorAndSetAccessor {
-}
-declare namespace ts.refactor.extractSymbol {
-    /**
-     * Compute the associated code actions
-     * Exported for tests.
-     */
-    function getAvailableActions(context: RefactorContext): ApplicableRefactorInfo[] | undefined;
-    function getEditsForAction(context: RefactorContext, actionName: string): RefactorEditInfo | undefined;
-    namespace Messages {
-        const cannotExtractRange: DiagnosticMessage;
-        const cannotExtractImport: DiagnosticMessage;
-        const cannotExtractSuper: DiagnosticMessage;
-        const cannotExtractEmpty: DiagnosticMessage;
-        const expressionExpected: DiagnosticMessage;
-        const uselessConstantType: DiagnosticMessage;
-        const statementOrExpressionExpected: DiagnosticMessage;
-        const cannotExtractRangeContainingConditionalBreakOrContinueStatements: DiagnosticMessage;
-        const cannotExtractRangeContainingConditionalReturnStatement: DiagnosticMessage;
-        const cannotExtractRangeContainingLabeledBreakOrContinueStatementWithTargetOutsideOfTheRange: DiagnosticMessage;
-        const cannotExtractRangeThatContainsWritesToReferencesLocatedOutsideOfTheTargetRangeInGenerators: DiagnosticMessage;
-        const typeWillNotBeVisibleInTheNewScope: DiagnosticMessage;
-        const functionWillNotBeVisibleInTheNewScope: DiagnosticMessage;
-        const cannotExtractIdentifier: DiagnosticMessage;
-        const cannotExtractExportedEntity: DiagnosticMessage;
-        const cannotWriteInExpression: DiagnosticMessage;
-        const cannotExtractReadonlyPropertyInitializerOutsideConstructor: DiagnosticMessage;
-        const cannotExtractAmbientBlock: DiagnosticMessage;
-        const cannotAccessVariablesFromNestedScopes: DiagnosticMessage;
-        const cannotExtractToOtherFunctionLike: DiagnosticMessage;
-        const cannotExtractToJSClass: DiagnosticMessage;
-        const cannotExtractToExpressionArrowFunction: DiagnosticMessage;
-    }
-    enum RangeFacts {
-        None = 0,
-        HasReturn = 1,
-        IsGenerator = 2,
-        IsAsyncFunction = 4,
-        UsesThis = 8,
-        /**
-         * The range is in a function which needs the 'static' modifier in a class
-         */
-        InStaticRegion = 16
-    }
-    /**
-     * Represents an expression or a list of statements that should be extracted with some extra information
-     */
-    interface TargetRange {
-        readonly range: Expression | Statement[];
-        readonly facts: RangeFacts;
-        /**
-         * A list of symbols that are declared in the selected range which are visible in the containing lexical scope
-         * Used to ensure we don't turn something used outside the range free (or worse, resolve to a different entity).
-         */
-        readonly declarations: Symbol[];
-    }
-    /**
-     * Result of 'getRangeToExtract' operation: contains either a range or a list of errors
-     */
-    type RangeToExtract = {
-        readonly targetRange?: never;
-        readonly errors: ReadonlyArray<Diagnostic>;
-    } | {
-        readonly targetRange: TargetRange;
-        readonly errors?: never;
-    };
-    /**
-     * getRangeToExtract takes a span inside a text file and returns either an expression or an array
-     * of statements representing the minimum set of nodes needed to extract the entire span. This
-     * process may fail, in which case a set of errors is returned instead (these are currently
-     * not shown to the user, but can be used by us diagnostically)
-     */
-    function getRangeToExtract(sourceFile: SourceFile, span: TextSpan): RangeToExtract;
-}
-declare namespace ts.refactor.generateGetAccessorAndSetAccessor {
-}
-declare namespace ts.refactor {
-}
-declare namespace ts.sourcemaps {
-    interface SourceMapData {
-        version?: number;
-        file?: string;
-        sourceRoot?: string;
-        sources: string[];
-        sourcesContent?: string[];
-        names?: string[];
-        mappings: string;
-    }
-    interface SourceMappableLocation {
-        fileName: string;
-        position: number;
-    }
-    interface SourceMapper {
-        getOriginalPosition(input: SourceMappableLocation): SourceMappableLocation;
-        getGeneratedPosition(input: SourceMappableLocation): SourceMappableLocation;
-    }
-    const identitySourceMapper: {
-        getOriginalPosition: typeof identity;
-        getGeneratedPosition: typeof identity;
-    };
-    interface SourceMapDecodeHost {
-        readFile(path: string): string | undefined;
-        fileExists(path: string): boolean;
-        getCanonicalFileName(path: string): string;
-        log(text: string): void;
-    }
-    function decode(host: SourceMapDecodeHost, mapPath: string, map: SourceMapData, program?: Program, fallbackCache?: SourceFileLikeCache): SourceMapper;
-}
-declare namespace ts {
-    /** The version of the language service API */
-    const servicesVersion = "0.8";
-    interface DisplayPartsSymbolWriter extends EmitTextWriter {
-        displayParts(): SymbolDisplayPart[];
-    }
-    function toEditorSettings(options: FormatCodeOptions | FormatCodeSettings): FormatCodeSettings;
-    function toEditorSettings(options: EditorOptions | EditorSettings): EditorSettings;
-    function displayPartsToString(displayParts: SymbolDisplayPart[] | undefined): string;
-    function getDefaultCompilerOptions(): CompilerOptions;
-    function getSupportedCodeFixes(): string[];
-    function createLanguageServiceSourceFile(fileName: string, scriptSnapshot: IScriptSnapshot, scriptTarget: ScriptTarget, version: string, setNodeParents: boolean, scriptKind?: ScriptKind): SourceFile;
-    let disableIncrementalParsing: boolean;
-    function updateLanguageServiceSourceFile(sourceFile: SourceFile, scriptSnapshot: IScriptSnapshot, version: string, textChangeRange: TextChangeRange | undefined, aggressiveChecks?: boolean): SourceFile;
-    /** A cancellation that throttles calls to the host */
-    class ThrottledCancellationToken implements CancellationToken {
-        private hostCancellationToken;
-        private readonly throttleWaitMilliseconds;
-        private lastCancellationCheckTime;
-        constructor(hostCancellationToken: HostCancellationToken, throttleWaitMilliseconds?: number);
-        isCancellationRequested(): boolean;
-        throwIfCancellationRequested(): void;
-    }
-    interface SourceFileLikeCache {
-        get(path: Path): SourceFileLike | undefined;
-    }
-    function createSourceFileLikeCache(host: {
-        readFile?: (path: string) => string | undefined;
-        fileExists?: (path: string) => boolean;
-    }): SourceFileLikeCache;
-    function createLanguageService(host: LanguageServiceHost, documentRegistry?: DocumentRegistry, syntaxOnly?: boolean): LanguageService;
-    /** Names in the name table are escaped, so an identifier `__foo` will have a name table entry `___foo`. */
-    function getNameTable(sourceFile: SourceFile): UnderscoreEscapedMap<number>;
-    /**
-     * Returns the containing object literal property declaration given a possible name node, e.g. "a" in x = { "a": 1 }
-     */
-    function getContainingObjectLiteralElement(node: Node): ObjectLiteralElement | undefined;
-    function getPropertySymbolsFromContextualType(typeChecker: TypeChecker, node: ObjectLiteralElement): Symbol[];
-    function getPropertySymbolsFromType(type: Type, propName: PropertyName): Symbol[] | undefined;
-    /**
-     * Get the path of the default library files (lib.d.ts) as distributed with the typescript
-     * node package.
-     * The functionality is not supported if the ts module is consumed outside of a node module.
-     */
-    function getDefaultLibFilePath(options: CompilerOptions): string;
-}
-declare namespace ts.BreakpointResolver {
-    /**
-     * Get the breakpoint span in given sourceFile
-     */
-    function spanInSourceFileAtLocation(sourceFile: SourceFile, position: number): TextSpan | undefined;
-}
-declare namespace ts {
-    /**
-     * Transform one or more nodes using the supplied transformers.
-     * @param source A single `Node` or an array of `Node` objects.
-     * @param transformers An array of `TransformerFactory` callbacks used to process the transformation.
-     * @param compilerOptions Optional compiler options.
-     */
-    function transform<T extends Node>(source: T | T[], transformers: TransformerFactory<T>[], compilerOptions?: CompilerOptions): TransformationResult<T>;
-}
-declare let debugObjectHost: {
-    CollectGarbage(): void;
-};
-declare namespace ts {
-    interface ScriptSnapshotShim {
-        /** Gets a portion of the script snapshot specified by [start, end). */
-        getText(start: number, end: number): string;
-        /** Gets the length of this script snapshot. */
-        getLength(): number;
-        /**
-         * Returns a JSON-encoded value of the type:
-         *   { span: { start: number; length: number }; newLength: number }
-         *
-         * Or undefined value if there was no change.
-         */
-        getChangeRange(oldSnapshot: ScriptSnapshotShim): string | undefined;
-        /** Releases all resources held by this script snapshot */
-        dispose?(): void;
-    }
-    interface Logger {
-        log(s: string): void;
-        trace(s: string): void;
-        error(s: string): void;
-    }
-    /** Public interface of the host of a language service shim instance. */
-    interface LanguageServiceShimHost extends Logger {
-        getCompilationSettings(): string;
-        /** Returns a JSON-encoded value of the type: string[] */
-        getScriptFileNames(): string;
-        getScriptKind?(fileName: string): ScriptKind;
-        getScriptVersion(fileName: string): string;
-        getScriptSnapshot(fileName: string): ScriptSnapshotShim;
-        getLocalizedDiagnosticMessages(): string;
-        getCancellationToken(): HostCancellationToken;
-        getCurrentDirectory(): string;
-        getDirectories(path: string): string;
-        getDefaultLibFileName(options: string): string;
-        getNewLine?(): string;
-        getProjectVersion?(): string;
-        useCaseSensitiveFileNames?(): boolean;
-        getTypeRootsVersion?(): number;
-        readDirectory(rootDir: string, extension: string, basePaths?: string, excludeEx?: string, includeFileEx?: string, includeDirEx?: string, depth?: number): string;
-        readFile(path: string, encoding?: string): string | undefined;
-        fileExists(path: string): boolean;
-        getModuleResolutionsForFile?(fileName: string): string;
-        getTypeReferenceDirectiveResolutionsForFile?(fileName: string): string;
-        directoryExists(directoryName: string): boolean;
-    }
-    /** Public interface of the core-services host instance used in managed side */
-    interface CoreServicesShimHost extends Logger {
-        directoryExists(directoryName: string): boolean;
-        fileExists(fileName: string): boolean;
-        getCurrentDirectory(): string;
-        getDirectories(path: string): string;
-        /**
-         * Returns a JSON-encoded value of the type: string[]
-         *
-         * @param exclude A JSON encoded string[] containing the paths to exclude
-         *  when enumerating the directory.
-         */
-        readDirectory(rootDir: string, extension: string, basePaths?: string, excludeEx?: string, includeFileEx?: string, includeDirEx?: string, depth?: number): string;
-        /**
-         * Read arbitary text files on disk, i.e. when resolution procedure needs the content of 'package.json' to determine location of bundled typings for node modules
-         */
-        readFile(fileName: string): string | undefined;
-        realpath?(path: string): string;
-        trace(s: string): void;
-        useCaseSensitiveFileNames?(): boolean;
-    }
-    interface ShimsFileReference {
-        path: string;
-        position: number;
-        length: number;
-    }
-    /** Public interface of a language service instance shim. */
-    interface ShimFactory {
-        registerShim(shim: Shim): void;
-        unregisterShim(shim: Shim): void;
-    }
-    interface Shim {
-        dispose(_dummy: {}): void;
-    }
-    interface LanguageServiceShim extends Shim {
-        languageService: LanguageService;
-        dispose(_dummy: {}): void;
-        refresh(throwOnError: boolean): void;
-        cleanupSemanticCache(): void;
-        getSyntacticDiagnostics(fileName: string): string;
-        getSemanticDiagnostics(fileName: string): string;
-        getSuggestionDiagnostics(fileName: string): string;
-        getCompilerOptionsDiagnostics(): string;
-        getSyntacticClassifications(fileName: string, start: number, length: number): string;
-        getSemanticClassifications(fileName: string, start: number, length: number): string;
-        getEncodedSyntacticClassifications(fileName: string, start: number, length: number): string;
-        getEncodedSemanticClassifications(fileName: string, start: number, length: number): string;
-        getCompletionsAtPosition(fileName: string, position: number, preferences: UserPreferences | undefined): string;
-        getCompletionEntryDetails(fileName: string, position: number, entryName: string, formatOptions: string | undefined, source: string | undefined, preferences: UserPreferences | undefined): string;
-        getQuickInfoAtPosition(fileName: string, position: number): string;
-        getNameOrDottedNameSpan(fileName: string, startPos: number, endPos: number): string;
-        getBreakpointStatementAtPosition(fileName: string, position: number): string;
-        getSignatureHelpItems(fileName: string, position: number): string;
-        /**
-         * Returns a JSON-encoded value of the type:
-         * { canRename: boolean, localizedErrorMessage: string, displayName: string, fullDisplayName: string, kind: string, kindModifiers: string, triggerSpan: { start; length } }
-         */
-        getRenameInfo(fileName: string, position: number): string;
-        /**
-         * Returns a JSON-encoded value of the type:
-         * { fileName: string, textSpan: { start: number, length: number } }[]
-         */
-        findRenameLocations(fileName: string, position: number, findInStrings: boolean, findInComments: boolean): string;
-        /**
-         * Returns a JSON-encoded value of the type:
-         * { fileName: string; textSpan: { start: number; length: number}; kind: string; name: string; containerKind: string; containerName: string }
-         *
-         * Or undefined value if no definition can be found.
-         */
-        getDefinitionAtPosition(fileName: string, position: number): string;
-        getDefinitionAndBoundSpan(fileName: string, position: number): string;
-        /**
-         * Returns a JSON-encoded value of the type:
-         * { fileName: string; textSpan: { start: number; length: number}; kind: string; name: string; containerKind: string; containerName: string }
-         *
-         * Or undefined value if no definition can be found.
-         */
-        getTypeDefinitionAtPosition(fileName: string, position: number): string;
-        /**
-         * Returns a JSON-encoded value of the type:
-         * { fileName: string; textSpan: { start: number; length: number}; }[]
-         */
-        getImplementationAtPosition(fileName: string, position: number): string;
-        /**
-         * Returns a JSON-encoded value of the type:
-         * { fileName: string; textSpan: { start: number; length: number}; isWriteAccess: boolean, isDefinition?: boolean }[]
-         */
-        getReferencesAtPosition(fileName: string, position: number): string;
-        /**
-         * Returns a JSON-encoded value of the type:
-         * { definition: <encoded>; references: <encoded>[] }[]
-         */
-        findReferences(fileName: string, position: number): string;
-        /**
-         * @deprecated
-         * Returns a JSON-encoded value of the type:
-         * { fileName: string; textSpan: { start: number; length: number}; isWriteAccess: boolean }[]
-         */
-        getOccurrencesAtPosition(fileName: string, position: number): string;
-        /**
-         * Returns a JSON-encoded value of the type:
-         * { fileName: string; highlights: { start: number; length: number, isDefinition: boolean }[] }[]
-         *
-         * @param fileToSearch A JSON encoded string[] containing the file names that should be
-         *  considered when searching.
-         */
-        getDocumentHighlights(fileName: string, position: number, filesToSearch: string): string;
-        /**
-         * Returns a JSON-encoded value of the type:
-         * { name: string; kind: string; kindModifiers: string; containerName: string; containerKind: string; matchKind: string; fileName: string; textSpan: { start: number; length: number}; } [] = [];
-         */
-        getNavigateToItems(searchValue: string, maxResultCount?: number, fileName?: string): string;
-        /**
-         * Returns a JSON-encoded value of the type:
-         * { text: string; kind: string; kindModifiers: string; bolded: boolean; grayed: boolean; indent: number; spans: { start: number; length: number; }[]; childItems: <recursive use of this type>[] } [] = [];
-         */
-        getNavigationBarItems(fileName: string): string;
-        /** Returns a JSON-encoded value of the type ts.NavigationTree. */
-        getNavigationTree(fileName: string): string;
-        /**
-         * Returns a JSON-encoded value of the type:
-         * { textSpan: { start: number, length: number }; hintSpan: { start: number, length: number }; bannerText: string; autoCollapse: boolean } [] = [];
-         */
-        getOutliningSpans(fileName: string): string;
-        getTodoComments(fileName: string, todoCommentDescriptors: string): string;
-        getBraceMatchingAtPosition(fileName: string, position: number): string;
-        getIndentationAtPosition(fileName: string, position: number, options: string): string;
-        getFormattingEditsForRange(fileName: string, start: number, end: number, options: string): string;
-        getFormattingEditsForDocument(fileName: string, options: string): string;
-        getFormattingEditsAfterKeystroke(fileName: string, position: number, key: string, options: string): string;
-        /**
-         * Returns JSON-encoded value of the type TextInsertion.
-         */
-        getDocCommentTemplateAtPosition(fileName: string, position: number): string;
-        /**
-         * Returns JSON-encoded boolean to indicate whether we should support brace location
-         * at the current position.
-         * E.g. we don't want brace completion inside string-literals, comments, etc.
-         */
-        isValidBraceCompletionAtPosition(fileName: string, position: number, openingBrace: number): string;
-        /**
-         * Returns a JSON-encoded TextSpan | undefined indicating the range of the enclosing comment, if it exists.
-         */
-        getSpanOfEnclosingComment(fileName: string, position: number, onlyMultiLine: boolean): string;
-        getEmitOutput(fileName: string): string;
-        getEmitOutputObject(fileName: string): EmitOutput;
-    }
-    interface ClassifierShim extends Shim {
-        getEncodedLexicalClassifications(text: string, lexState: EndOfLineState, syntacticClassifierAbsent?: boolean): string;
-        getClassificationsForLine(text: string, lexState: EndOfLineState, syntacticClassifierAbsent?: boolean): string;
-    }
-    interface CoreServicesShim extends Shim {
-        getAutomaticTypeDirectiveNames(compilerOptionsJson: string): string;
-        getPreProcessedFileInfo(fileName: string, sourceText: IScriptSnapshot): string;
-        getTSConfigFileInfo(fileName: string, sourceText: IScriptSnapshot): string;
-        getDefaultCompilationSettings(): string;
-        discoverTypings(discoverTypingsJson: string): string;
-    }
-    class LanguageServiceShimHostAdapter implements LanguageServiceHost {
-        private shimHost;
-        private files;
-        private loggingEnabled;
-        private tracingEnabled;
-        resolveModuleNames: (moduleName: string[], containingFile: string) => ResolvedModuleFull[];
-        resolveTypeReferenceDirectives: (typeDirectiveNames: string[], containingFile: string) => ResolvedTypeReferenceDirective[];
-        directoryExists: (directoryName: string) => boolean;
-        constructor(shimHost: LanguageServiceShimHost);
-        log(s: string): void;
-        trace(s: string): void;
-        error(s: string): void;
-        getProjectVersion(): string;
-        getTypeRootsVersion(): number;
-        useCaseSensitiveFileNames(): boolean;
-        getCompilationSettings(): CompilerOptions;
-        getScriptFileNames(): string[];
-        getScriptSnapshot(fileName: string): IScriptSnapshot | undefined;
-        getScriptKind(fileName: string): ScriptKind;
-        getScriptVersion(fileName: string): string;
-        getLocalizedDiagnosticMessages(): any;
-        getCancellationToken(): HostCancellationToken;
-        getCurrentDirectory(): string;
-        getDirectories(path: string): string[];
-        getDefaultLibFileName(options: CompilerOptions): string;
-        readDirectory(path: string, extensions?: ReadonlyArray<string>, exclude?: string[], include?: string[], depth?: number): string[];
-        readFile(path: string, encoding?: string): string | undefined;
-        fileExists(path: string): boolean;
-    }
-    class CoreServicesShimHostAdapter implements ParseConfigHost, ModuleResolutionHost, JsTyping.TypingResolutionHost {
-        private shimHost;
-        directoryExists: (directoryName: string) => boolean;
-        realpath: (path: string) => string;
-        useCaseSensitiveFileNames: boolean;
-        constructor(shimHost: CoreServicesShimHost);
-        readDirectory(rootDir: string, extensions: ReadonlyArray<string>, exclude: ReadonlyArray<string>, include: ReadonlyArray<string>, depth?: number): string[];
-        fileExists(fileName: string): boolean;
-        readFile(fileName: string): string | undefined;
-        getDirectories(path: string): string[];
-    }
-    interface RealizedDiagnostic {
-        message: string;
-        start: number;
-        length: number;
-        category: string;
-        code: number;
-        reportsUnnecessary?: {};
-    }
-    function realizeDiagnostics(diagnostics: ReadonlyArray<Diagnostic>, newLine: string): RealizedDiagnostic[];
-    class TypeScriptServicesFactory implements ShimFactory {
-        private _shims;
-        private documentRegistry;
-        getServicesVersion(): string;
-        createLanguageServiceShim(host: LanguageServiceShimHost): LanguageServiceShim;
-        createClassifierShim(logger: Logger): ClassifierShim;
-        createCoreServicesShim(host: CoreServicesShimHost): CoreServicesShim;
-        close(): void;
-        registerShim(shim: Shim): void;
-        unregisterShim(shim: Shim): void;
-    }
-}
-declare namespace TypeScript.Services {
-    const TypeScriptServicesFactory: typeof ts.TypeScriptServicesFactory;
-}
-declare const toolsVersion = "3.0";
-//# sourceMappingURL=services.d.ts.map
-declare namespace ts.server {
-    const ActionSet: ActionSet;
-    const ActionInvalidate: ActionInvalidate;
-    const ActionPackageInstalled: ActionPackageInstalled;
-    const EventTypesRegistry: EventTypesRegistry;
-    const EventBeginInstallTypes: EventBeginInstallTypes;
-    const EventEndInstallTypes: EventEndInstallTypes;
-    const EventInitializationFailed: EventInitializationFailed;
-    namespace Arguments {
-        const GlobalCacheLocation = "--globalTypingsCacheLocation";
-        const LogFile = "--logFile";
-        const EnableTelemetry = "--enableTelemetry";
-        const TypingSafeListLocation = "--typingSafeListLocation";
-        const TypesMapLocation = "--typesMapLocation";
-        /**
-         * This argument specifies the location of the NPM executable.
-         * typingsInstaller will run the command with `${npmLocation} install ...`.
-         */
-        const NpmLocation = "--npmLocation";
-    }
-    function hasArgument(argumentName: string): boolean;
-    function findArgument(argumentName: string): string | undefined;
-    function nowString(): string;
-}
-declare namespace ts.server {
-    type ActionSet = "action::set";
-    type ActionInvalidate = "action::invalidate";
-    type ActionPackageInstalled = "action::packageInstalled";
-    type EventTypesRegistry = "event::typesRegistry";
-    type EventBeginInstallTypes = "event::beginInstallTypes";
-    type EventEndInstallTypes = "event::endInstallTypes";
-    type EventInitializationFailed = "event::initializationFailed";
-    interface SortedReadonlyArray<T> extends ReadonlyArray<T> {
-        " __sortedArrayBrand": any;
-    }
-    interface TypingInstallerResponse {
-        readonly kind: ActionSet | ActionInvalidate | EventTypesRegistry | ActionPackageInstalled | EventBeginInstallTypes | EventEndInstallTypes | EventInitializationFailed;
-    }
-    interface TypingInstallerRequestWithProjectName {
-        readonly projectName: string;
-    }
-    type TypingInstallerRequestUnion = DiscoverTypings | CloseProject | TypesRegistryRequest | InstallPackageRequest;
-    interface DiscoverTypings extends TypingInstallerRequestWithProjectName {
-        readonly fileNames: string[];
-        readonly projectRootPath: Path;
-        readonly compilerOptions: CompilerOptions;
-        readonly typeAcquisition: TypeAcquisition;
-        readonly unresolvedImports: SortedReadonlyArray<string>;
-        readonly cachePath?: string;
-        readonly kind: "discover";
-    }
-    interface CloseProject extends TypingInstallerRequestWithProjectName {
-        readonly kind: "closeProject";
-    }
-    interface TypesRegistryRequest {
-        readonly kind: "typesRegistry";
-    }
-    interface InstallPackageRequest extends TypingInstallerRequestWithProjectName {
-        readonly kind: "installPackage";
-        readonly fileName: Path;
-        readonly packageName: string;
-        readonly projectRootPath: Path;
-    }
-    interface TypesRegistryResponse extends TypingInstallerResponse {
-        readonly kind: EventTypesRegistry;
-        readonly typesRegistry: MapLike<MapLike<string>>;
-    }
-    interface PackageInstalledResponse extends ProjectResponse {
-        readonly kind: ActionPackageInstalled;
-        readonly success: boolean;
-        readonly message: string;
-    }
-    interface InitializationFailedResponse extends TypingInstallerResponse {
-        readonly kind: EventInitializationFailed;
-        readonly message: string;
-    }
-    interface ProjectResponse extends TypingInstallerResponse {
-        readonly projectName: string;
-    }
-    interface InvalidateCachedTypings extends ProjectResponse {
-        readonly kind: ActionInvalidate;
-    }
-    interface InstallTypes extends ProjectResponse {
-        readonly kind: EventBeginInstallTypes | EventEndInstallTypes;
-        readonly eventId: number;
-        readonly typingsInstallerVersion: string;
-        readonly packagesToInstall: ReadonlyArray<string>;
-    }
-    interface BeginInstallTypes extends InstallTypes {
-        readonly kind: EventBeginInstallTypes;
-    }
-    interface EndInstallTypes extends InstallTypes {
-        readonly kind: EventEndInstallTypes;
-        readonly installSuccess: boolean;
-    }
-    interface InstallTypingHost extends JsTyping.TypingResolutionHost {
-        useCaseSensitiveFileNames: boolean;
-        writeFile(path: string, content: string): void;
-        createDirectory(path: string): void;
-        watchFile?(path: string, callback: FileWatcherCallback, pollingInterval?: number): FileWatcher;
-        watchDirectory?(path: string, callback: DirectoryWatcherCallback, recursive?: boolean): FileWatcher;
-    }
-    interface SetTypings extends ProjectResponse {
-        readonly typeAcquisition: TypeAcquisition;
-        readonly compilerOptions: CompilerOptions;
-        readonly typings: string[];
-        readonly unresolvedImports: SortedReadonlyArray<string>;
-        readonly kind: ActionSet;
-    }
-    type TypingInstallerResponseUnion = SetTypings | InvalidateCachedTypings | TypesRegistryResponse | PackageInstalledResponse | InstallTypes | InitializationFailedResponse;
-}
-declare namespace ts.JsTyping {
-    interface TypingResolutionHost {
-        directoryExists(path: string): boolean;
-        fileExists(fileName: string): boolean;
-        readFile(path: string, encoding?: string): string | undefined;
-        readDirectory(rootDir: string, extensions: ReadonlyArray<string>, excludes: ReadonlyArray<string> | undefined, includes: ReadonlyArray<string> | undefined, depth?: number): string[];
-    }
-    interface CachedTyping {
-        typingLocation: string;
-        version: Semver;
-    }
-    function isTypingUpToDate(cachedTyping: CachedTyping, availableTypingVersions: MapLike<string>): boolean;
-    const nodeCoreModuleList: ReadonlyArray<string>;
-    const nodeCoreModules: Map<true>;
-    /**
-     * A map of loose file names to library names that we are confident require typings
-     */
-    type SafeList = ReadonlyMap<string>;
-    function loadSafeList(host: TypingResolutionHost, safeListPath: Path): SafeList;
-    function loadTypesMap(host: TypingResolutionHost, typesMapPath: Path): SafeList | undefined;
-    /**
-     * @param host is the object providing I/O related operations.
-     * @param fileNames are the file names that belong to the same project
-     * @param projectRootPath is the path to the project root directory
-     * @param safeListPath is the path used to retrieve the safe list
-     * @param packageNameToTypingLocation is the map of package names to their cached typing locations and installed versions
-     * @param typeAcquisition is used to customize the typing acquisition process
-     * @param compilerOptions are used as a source for typing inference
-     */
-    function discoverTypings(host: TypingResolutionHost, log: ((message: string) => void) | undefined, fileNames: string[], projectRootPath: Path, safeList: SafeList, packageNameToTypingLocation: ReadonlyMap<CachedTyping>, typeAcquisition: TypeAcquisition, unresolvedImports: ReadonlyArray<string>, typesRegistry: ReadonlyMap<MapLike<string>>): {
-        cachedTypingPaths: string[];
-        newTypingNames: string[];
-        filesToWatch: string[];
-    };
-    enum PackageNameValidationResult {
-        Ok = 0,
-        ScopedPackagesNotSupported = 1,
-        EmptyName = 2,
-        NameTooLong = 3,
-        NameStartsWithDot = 4,
-        NameStartsWithUnderscore = 5,
-        NameContainsNonURISafeCharacters = 6
-    }
-    /**
-     * Validates package name using rules defined at https://docs.npmjs.com/files/package.json
-     */
-    function validatePackageName(packageName: string): PackageNameValidationResult;
-    function renderPackageNameValidationFailure(result: PackageNameValidationResult, typing: string): string;
-}
-declare namespace ts {
-    class Semver {
-        readonly major: number;
-        readonly minor: number;
-        readonly patch: number;
-        /**
-         * If true, this is `major.minor.0-next.patch`.
-         * If false, this is `major.minor.patch`.
-         */
-        readonly isPrerelease: boolean;
-        static parse(semver: string): Semver;
-        static fromRaw({ major, minor, patch, isPrerelease }: Semver): Semver;
-        private static tryParse;
-        private constructor();
-        readonly versionString: string;
-        equals(sem: Semver): boolean;
-        greaterThan(sem: Semver): boolean;
-    }
-}
-//# sourceMappingURL=jsTyping.d.ts.map
-declare namespace ts.server {
-    interface CompressedData {
-        length: number;
-        compressionKind: string;
-        data: any;
-    }
-    type RequireResult = {
-        module: {};
-        error: undefined;
-    } | {
-        module: undefined;
-        error: {
-            stack?: string;
-            message?: string;
-        };
-    };
-    interface ServerHost extends System {
-        watchFile(path: string, callback: FileWatcherCallback, pollingInterval?: number): FileWatcher;
-        watchDirectory(path: string, callback: DirectoryWatcherCallback, recursive?: boolean): FileWatcher;
-        setTimeout(callback: (...args: any[]) => void, ms: number, ...args: any[]): any;
-        clearTimeout(timeoutId: any): void;
-        setImmediate(callback: (...args: any[]) => void, ...args: any[]): any;
-        clearImmediate(timeoutId: any): void;
-        gc?(): void;
-        trace?(s: string): void;
-        require?(initialPath: string, moduleName: string): RequireResult;
-    }
-}
-declare namespace ts.server {
-    enum LogLevel {
-        terse = 0,
-        normal = 1,
-        requestTime = 2,
-        verbose = 3
-    }
-    const emptyArray: SortedReadonlyArray<never>;
-    interface Logger {
-        close(): void;
-        hasLevel(level: LogLevel): boolean;
-        loggingEnabled(): boolean;
-        perftrc(s: string): void;
-        info(s: string): void;
-        startGroup(): void;
-        endGroup(): void;
-        msg(s: string, type?: Msg): void;
-        getLogFileName(): string | undefined;
-    }
-    enum Msg {
-        Err = "Err",
-        Info = "Info",
-        Perf = "Perf"
-    }
-    namespace Msg {
-        type Types = Msg;
-    }
-    function createInstallTypingsRequest(project: Project, typeAcquisition: TypeAcquisition, unresolvedImports: SortedReadonlyArray<string>, cachePath?: string): DiscoverTypings;
-    namespace Errors {
-        function ThrowNoProject(): never;
-        function ThrowProjectLanguageServiceDisabled(): never;
-        function ThrowProjectDoesNotContainDocument(fileName: string, project: Project): never;
-    }
-    function getDefaultFormatCodeSettings(host: ServerHost): FormatCodeSettings;
-    type NormalizedPath = string & {
-        __normalizedPathTag: any;
-    };
-    function toNormalizedPath(fileName: string): NormalizedPath;
-    function normalizedPathToPath(normalizedPath: NormalizedPath, currentDirectory: string, getCanonicalFileName: (f: string) => string): Path;
-    function asNormalizedPath(fileName: string): NormalizedPath;
-    interface NormalizedPathMap<T> {
-        get(path: NormalizedPath): T | undefined;
-        set(path: NormalizedPath, value: T): void;
-        contains(path: NormalizedPath): boolean;
-        remove(path: NormalizedPath): void;
-    }
-    function createNormalizedPathMap<T>(): NormalizedPathMap<T>;
-    interface ProjectOptions {
-        configHasExtendsProperty: boolean;
-        configHasFilesProperty: boolean;
-        configHasIncludeProperty: boolean;
-        configHasExcludeProperty: boolean;
-        projectReferences: ReadonlyArray<ProjectReference> | undefined;
-        files?: string[];
-        wildcardDirectories?: Map<WatchDirectoryFlags>;
-        compilerOptions?: CompilerOptions;
-        typeAcquisition?: TypeAcquisition;
-        compileOnSave?: boolean;
-    }
-    function isInferredProjectName(name: string): boolean;
-    function makeInferredProjectName(counter: number): string;
-    function createSortedArray<T>(): SortedArray<T>;
-}
-declare namespace ts.server {
-    class ThrottledOperations {
-        private readonly host;
-        private readonly pendingTimeouts;
-        private readonly logger?;
-        constructor(host: ServerHost, logger: Logger);
-        schedule(operationId: string, delay: number, cb: () => void): void;
-        private static run;
-    }
-    class GcTimer {
-        private readonly host;
-        private readonly delay;
-        private readonly logger;
-        private timerId;
-        constructor(host: ServerHost, delay: number, logger: Logger);
-        scheduleCollect(): void;
-        private static run;
-    }
-    function getBaseConfigFileName(configFilePath: NormalizedPath): "tsconfig.json" | "jsconfig.json" | undefined;
-    function removeSorted<T>(array: SortedArray<T>, remove: T, compare: Comparer<T>): void;
-    function toSortedArray(arr: string[]): SortedArray<string>;
-    function toSortedArray<T>(arr: T[], comparer: Comparer<T>): SortedArray<T>;
-    function toDeduplicatedSortedArray(arr: string[]): SortedArray<string>;
-    function indent(str: string): string;
-    function stringifyIndented(json: {}): string;
-}
-declare namespace ts.server.protocol {
-    enum CommandTypes {
-        JsxClosingTag = "jsxClosingTag",
-        Brace = "brace",
-        BraceFull = "brace-full",
-        BraceCompletion = "braceCompletion",
-        GetSpanOfEnclosingComment = "getSpanOfEnclosingComment",
-        Change = "change",
-        Close = "close",
-        Completions = "completions",
-        CompletionsFull = "completions-full",
-        CompletionDetails = "completionEntryDetails",
-        CompletionDetailsFull = "completionEntryDetails-full",
-        CompileOnSaveAffectedFileList = "compileOnSaveAffectedFileList",
-        CompileOnSaveEmitFile = "compileOnSaveEmitFile",
-        Configure = "configure",
-        Definition = "definition",
-        DefinitionFull = "definition-full",
-        DefinitionAndBoundSpan = "definitionAndBoundSpan",
-        DefinitionAndBoundSpanFull = "definitionAndBoundSpan-full",
-        Implementation = "implementation",
-        ImplementationFull = "implementation-full",
-        Exit = "exit",
-        Format = "format",
-        Formatonkey = "formatonkey",
-        FormatFull = "format-full",
-        FormatonkeyFull = "formatonkey-full",
-        FormatRangeFull = "formatRange-full",
-        Geterr = "geterr",
-        GeterrForProject = "geterrForProject",
-        SemanticDiagnosticsSync = "semanticDiagnosticsSync",
-        SyntacticDiagnosticsSync = "syntacticDiagnosticsSync",
-        SuggestionDiagnosticsSync = "suggestionDiagnosticsSync",
-        NavBar = "navbar",
-        NavBarFull = "navbar-full",
-        Navto = "navto",
-        NavtoFull = "navto-full",
-        NavTree = "navtree",
-        NavTreeFull = "navtree-full",
-        Occurrences = "occurrences",
-        DocumentHighlights = "documentHighlights",
-        DocumentHighlightsFull = "documentHighlights-full",
-        Open = "open",
-        Quickinfo = "quickinfo",
-        QuickinfoFull = "quickinfo-full",
-        References = "references",
-        ReferencesFull = "references-full",
-        Reload = "reload",
-        Rename = "rename",
-        RenameInfoFull = "rename-full",
-        RenameLocationsFull = "renameLocations-full",
-        Saveto = "saveto",
-        SignatureHelp = "signatureHelp",
-        SignatureHelpFull = "signatureHelp-full",
-        Status = "status",
-        TypeDefinition = "typeDefinition",
-        ProjectInfo = "projectInfo",
-        ReloadProjects = "reloadProjects",
-        Unknown = "unknown",
-        OpenExternalProject = "openExternalProject",
-        OpenExternalProjects = "openExternalProjects",
-        CloseExternalProject = "closeExternalProject",
-        SynchronizeProjectList = "synchronizeProjectList",
-        ApplyChangedToOpenFiles = "applyChangedToOpenFiles",
-        EncodedSemanticClassificationsFull = "encodedSemanticClassifications-full",
-        Cleanup = "cleanup",
-        GetOutliningSpans = "getOutliningSpans",
-        GetOutliningSpansFull = "outliningSpans",
-        TodoComments = "todoComments",
-        Indentation = "indentation",
-        DocCommentTemplate = "docCommentTemplate",
-        CompilerOptionsDiagnosticsFull = "compilerOptionsDiagnostics-full",
-        NameOrDottedNameSpan = "nameOrDottedNameSpan",
-        BreakpointStatement = "breakpointStatement",
-        CompilerOptionsForInferredProjects = "compilerOptionsForInferredProjects",
-        GetCodeFixes = "getCodeFixes",
-        GetCodeFixesFull = "getCodeFixes-full",
-        GetCombinedCodeFix = "getCombinedCodeFix",
-        GetCombinedCodeFixFull = "getCombinedCodeFix-full",
-        ApplyCodeActionCommand = "applyCodeActionCommand",
-        GetSupportedCodeFixes = "getSupportedCodeFixes",
-        GetApplicableRefactors = "getApplicableRefactors",
-        GetEditsForRefactor = "getEditsForRefactor",
-        GetEditsForRefactorFull = "getEditsForRefactor-full",
-        OrganizeImports = "organizeImports",
-        OrganizeImportsFull = "organizeImports-full",
-        GetEditsForFileRename = "getEditsForFileRename",
-        GetEditsForFileRenameFull = "getEditsForFileRename-full"
-    }
-    interface Message {
-        seq: number;
-        type: "request" | "response" | "event";
-    }
-    interface Request extends Message {
-        type: "request";
-        command: string;
-        arguments?: any;
-    }
-    interface ReloadProjectsRequest extends Message {
-        command: CommandTypes.ReloadProjects;
-    }
-    interface Event extends Message {
-        type: "event";
-        event: string;
-        body?: any;
-    }
-    interface Response extends Message {
-        type: "response";
-        request_seq: number;
-        success: boolean;
-        command: string;
-        message?: string;
-        body?: any;
-    }
-    interface FileRequestArgs {
-        file: string;
-        projectFileName?: string;
-    }
-    interface StatusRequest extends Request {
-        command: CommandTypes.Status;
-    }
-    interface StatusResponseBody {
-        version: string;
-    }
-    interface StatusResponse extends Response {
-        body: StatusResponseBody;
-    }
-    interface DocCommentTemplateRequest extends FileLocationRequest {
-        command: CommandTypes.DocCommentTemplate;
-    }
-    interface DocCommandTemplateResponse extends Response {
-        body?: TextInsertion;
-    }
-    interface TodoCommentRequest extends FileRequest {
-        command: CommandTypes.TodoComments;
-        arguments: TodoCommentRequestArgs;
-    }
-    interface TodoCommentRequestArgs extends FileRequestArgs {
-        descriptors: TodoCommentDescriptor[];
-    }
-    interface TodoCommentsResponse extends Response {
-        body?: TodoComment[];
-    }
-    interface SpanOfEnclosingCommentRequest extends FileLocationRequest {
-        command: CommandTypes.GetSpanOfEnclosingComment;
-        arguments: SpanOfEnclosingCommentRequestArgs;
-    }
-    interface SpanOfEnclosingCommentRequestArgs extends FileLocationRequestArgs {
-        onlyMultiLine: boolean;
-    }
-    interface OutliningSpansRequest extends FileRequest {
-        command: CommandTypes.GetOutliningSpans;
-    }
-    interface OutliningSpan {
-        textSpan: TextSpan;
-        hintSpan: TextSpan;
-        bannerText: string;
-        autoCollapse: boolean;
-        kind: OutliningSpanKind;
-    }
-    interface OutliningSpansResponse extends Response {
-        body?: OutliningSpan[];
-    }
-    interface OutliningSpansRequestFull extends FileRequest {
-        command: CommandTypes.GetOutliningSpansFull;
-    }
-    interface OutliningSpansResponseFull extends Response {
-        body?: ts.OutliningSpan[];
-    }
-    interface IndentationRequest extends FileLocationRequest {
-        command: CommandTypes.Indentation;
-        arguments: IndentationRequestArgs;
-    }
-    interface IndentationResponse extends Response {
-        body?: IndentationResult;
-    }
-    interface IndentationResult {
-        position: number;
-        indentation: number;
-    }
-    interface IndentationRequestArgs extends FileLocationRequestArgs {
-        options?: EditorSettings;
-    }
-    interface ProjectInfoRequestArgs extends FileRequestArgs {
-        needFileNameList: boolean;
-    }
-    interface ProjectInfoRequest extends Request {
-        command: CommandTypes.ProjectInfo;
-        arguments: ProjectInfoRequestArgs;
-    }
-    interface CompilerOptionsDiagnosticsRequest extends Request {
-        arguments: CompilerOptionsDiagnosticsRequestArgs;
-    }
-    interface CompilerOptionsDiagnosticsRequestArgs {
-        projectFileName: string;
-    }
-    interface ProjectInfo {
-        configFileName: string;
-        fileNames?: string[];
-        languageServiceDisabled?: boolean;
-    }
-    interface DiagnosticWithLinePosition {
-        message: string;
-        start: number;
-        length: number;
-        startLocation: Location;
-        endLocation: Location;
-        category: string;
-        code: number;
-        reportsUnnecessary?: {};
-    }
-    interface ProjectInfoResponse extends Response {
-        body?: ProjectInfo;
-    }
-    interface FileRequest extends Request {
-        arguments: FileRequestArgs;
-    }
-    interface FileLocationRequestArgs extends FileRequestArgs {
-        line: number;
-        offset: number;
-        position?: number;
-    }
-    type FileLocationOrRangeRequestArgs = FileLocationRequestArgs | FileRangeRequestArgs;
-    interface GetApplicableRefactorsRequest extends Request {
-        command: CommandTypes.GetApplicableRefactors;
-        arguments: GetApplicableRefactorsRequestArgs;
-    }
-    type GetApplicableRefactorsRequestArgs = FileLocationOrRangeRequestArgs;
-    interface GetApplicableRefactorsResponse extends Response {
-        body?: ApplicableRefactorInfo[];
-    }
-    interface ApplicableRefactorInfo {
-        name: string;
-        description: string;
-        inlineable?: boolean;
-        actions: RefactorActionInfo[];
-    }
-    interface RefactorActionInfo {
-        name: string;
-        description: string;
-    }
-    interface GetEditsForRefactorRequest extends Request {
-        command: CommandTypes.GetEditsForRefactor;
-        arguments: GetEditsForRefactorRequestArgs;
-    }
-    type GetEditsForRefactorRequestArgs = FileLocationOrRangeRequestArgs & {
-        refactor: string;
-        action: string;
-    };
-    interface GetEditsForRefactorResponse extends Response {
-        body?: RefactorEditInfo;
-    }
-    interface RefactorEditInfo {
-        edits: FileCodeEdits[];
-        renameLocation?: Location;
-        renameFilename?: string;
-    }
-    interface OrganizeImportsRequest extends Request {
-        command: CommandTypes.OrganizeImports;
-        arguments: OrganizeImportsRequestArgs;
-    }
-    type OrganizeImportsScope = GetCombinedCodeFixScope;
-    interface OrganizeImportsRequestArgs {
-        scope: OrganizeImportsScope;
-    }
-    interface OrganizeImportsResponse extends Response {
-        edits: ReadonlyArray<FileCodeEdits>;
-    }
-    interface GetEditsForFileRenameRequest extends Request {
-        command: CommandTypes.GetEditsForFileRename;
-        arguments: GetEditsForFileRenameRequestArgs;
-    }
-    interface GetEditsForFileRenameRequestArgs extends FileRequestArgs {
-        readonly oldFilePath: string;
-        readonly newFilePath: string;
-    }
-    interface GetEditsForFileRenameResponse extends Response {
-        edits: ReadonlyArray<FileCodeEdits>;
-    }
-    interface CodeFixRequest extends Request {
-        command: CommandTypes.GetCodeFixes;
-        arguments: CodeFixRequestArgs;
-    }
-    interface GetCombinedCodeFixRequest extends Request {
-        command: CommandTypes.GetCombinedCodeFix;
-        arguments: GetCombinedCodeFixRequestArgs;
-    }
-    interface GetCombinedCodeFixResponse extends Response {
-        body: CombinedCodeActions;
-    }
-    interface ApplyCodeActionCommandRequest extends Request {
-        command: CommandTypes.ApplyCodeActionCommand;
-        arguments: ApplyCodeActionCommandRequestArgs;
-    }
-    interface ApplyCodeActionCommandResponse extends Response {
-    }
-    interface FileRangeRequestArgs extends FileRequestArgs {
-        startLine: number;
-        startOffset: number;
-        startPosition?: number;
-        endLine: number;
-        endOffset: number;
-        endPosition?: number;
-    }
-    interface CodeFixRequestArgs extends FileRangeRequestArgs {
-        errorCodes?: ReadonlyArray<number>;
-    }
-    interface GetCombinedCodeFixRequestArgs {
-        scope: GetCombinedCodeFixScope;
-        fixId: {};
-    }
-    interface GetCombinedCodeFixScope {
-        type: "file";
-        args: FileRequestArgs;
-    }
-    interface ApplyCodeActionCommandRequestArgs {
-        command: {};
-    }
-    interface GetCodeFixesResponse extends Response {
-        body?: CodeAction[];
-    }
-    interface FileLocationRequest extends FileRequest {
-        arguments: FileLocationRequestArgs;
-    }
-    interface GetSupportedCodeFixesRequest extends Request {
-        command: CommandTypes.GetSupportedCodeFixes;
-    }
-    interface GetSupportedCodeFixesResponse extends Response {
-        body?: string[];
-    }
-    interface EncodedSemanticClassificationsRequest extends FileRequest {
-        arguments: EncodedSemanticClassificationsRequestArgs;
-    }
-    interface EncodedSemanticClassificationsRequestArgs extends FileRequestArgs {
-        start: number;
-        length: number;
-    }
-    interface DocumentHighlightsRequestArgs extends FileLocationRequestArgs {
-        filesToSearch: string[];
-    }
-    interface DefinitionRequest extends FileLocationRequest {
-        command: CommandTypes.Definition;
-    }
-    interface TypeDefinitionRequest extends FileLocationRequest {
-        command: CommandTypes.TypeDefinition;
-    }
-    interface ImplementationRequest extends FileLocationRequest {
-        command: CommandTypes.Implementation;
-    }
-    interface Location {
-        line: number;
-        offset: number;
-    }
-    interface TextSpan {
-        start: Location;
-        end: Location;
-    }
-    interface FileSpan extends TextSpan {
-        file: string;
-    }
-    interface DefinitionInfoAndBoundSpan {
-        definitions: ReadonlyArray<FileSpan>;
-        textSpan: TextSpan;
-    }
-    interface DefinitionResponse extends Response {
-        body?: FileSpan[];
-    }
-    interface DefinitionInfoAndBoundSpanReponse extends Response {
-        body?: DefinitionInfoAndBoundSpan;
-    }
-    interface TypeDefinitionResponse extends Response {
-        body?: FileSpan[];
-    }
-    interface ImplementationResponse extends Response {
-        body?: FileSpan[];
-    }
-    interface BraceCompletionRequest extends FileLocationRequest {
-        command: CommandTypes.BraceCompletion;
-        arguments: BraceCompletionRequestArgs;
-    }
-    interface BraceCompletionRequestArgs extends FileLocationRequestArgs {
-        openingBrace: string;
-    }
-    interface JsxClosingTagRequest extends FileLocationRequest {
-        readonly command: CommandTypes.JsxClosingTag;
-        readonly arguments: JsxClosingTagRequestArgs;
-    }
-    interface JsxClosingTagRequestArgs extends FileLocationRequestArgs {
-    }
-    interface JsxClosingTagResponse extends Response {
-        readonly body: TextInsertion;
-    }
-    interface OccurrencesRequest extends FileLocationRequest {
-        command: CommandTypes.Occurrences;
-    }
-    interface OccurrencesResponseItem extends FileSpan {
-        isWriteAccess: boolean;
-        isInString?: true;
-    }
-    interface OccurrencesResponse extends Response {
-        body?: OccurrencesResponseItem[];
-    }
-    interface DocumentHighlightsRequest extends FileLocationRequest {
-        command: CommandTypes.DocumentHighlights;
-        arguments: DocumentHighlightsRequestArgs;
-    }
-    interface HighlightSpan extends TextSpan {
-        kind: HighlightSpanKind;
-    }
-    interface DocumentHighlightsItem {
-        file: string;
-        highlightSpans: HighlightSpan[];
-    }
-    interface DocumentHighlightsResponse extends Response {
-        body?: DocumentHighlightsItem[];
-    }
-    interface ReferencesRequest extends FileLocationRequest {
-        command: CommandTypes.References;
-    }
-    interface ReferencesResponseItem extends FileSpan {
-        lineText: string;
-        isWriteAccess: boolean;
-        isDefinition: boolean;
-    }
-    interface ReferencesResponseBody {
-        refs: ReferencesResponseItem[];
-        symbolName: string;
-        symbolStartOffset: number;
-        symbolDisplayString: string;
-    }
-    interface ReferencesResponse extends Response {
-        body?: ReferencesResponseBody;
-    }
-    interface RenameRequestArgs extends FileLocationRequestArgs {
-        findInComments?: boolean;
-        findInStrings?: boolean;
-    }
-    interface RenameRequest extends FileLocationRequest {
-        command: CommandTypes.Rename;
-        arguments: RenameRequestArgs;
-    }
-    interface RenameInfo {
-        canRename: boolean;
-        localizedErrorMessage?: string;
-        displayName: string;
-        fullDisplayName: string;
-        kind: ScriptElementKind;
-        kindModifiers: string;
-    }
-    interface SpanGroup {
-        file: string;
-        locs: TextSpan[];
-    }
-    interface RenameResponseBody {
-        info: RenameInfo;
-        locs: ReadonlyArray<SpanGroup>;
-    }
-    interface RenameResponse extends Response {
-        body?: RenameResponseBody;
-    }
-    interface ExternalFile {
-        fileName: string;
-        scriptKind?: ScriptKindName | ts.ScriptKind;
-        hasMixedContent?: boolean;
-        content?: string;
-    }
-    interface ExternalProject {
-        projectFileName: string;
-        rootFiles: ExternalFile[];
-        options: ExternalProjectCompilerOptions;
-        typingOptions?: TypeAcquisition;
-        typeAcquisition?: TypeAcquisition;
-    }
-    interface CompileOnSaveMixin {
-        compileOnSave?: boolean;
-    }
-    type ExternalProjectCompilerOptions = CompilerOptions & CompileOnSaveMixin;
-    interface ProjectVersionInfo {
-        projectName: string;
-        isInferred: boolean;
-        version: number;
-        options: ts.CompilerOptions;
-        languageServiceDisabled: boolean;
-        lastFileExceededProgramSize?: string;
-    }
-    interface ProjectChanges {
-        added: string[];
-        removed: string[];
-        updated: string[];
-    }
-    interface ProjectFiles {
-        info?: ProjectVersionInfo;
-        files?: string[];
-        changes?: ProjectChanges;
-    }
-    interface ProjectFilesWithDiagnostics extends ProjectFiles {
-        projectErrors: DiagnosticWithLinePosition[];
-    }
-    interface ChangedOpenFile {
-        fileName: string;
-        changes: ts.TextChange[];
-    }
-    interface ConfigureRequestArguments {
-        hostInfo?: string;
-        file?: string;
-        formatOptions?: FormatCodeSettings;
-        preferences?: UserPreferences;
-        extraFileExtensions?: FileExtensionInfo[];
-    }
-    interface ConfigureRequest extends Request {
-        command: CommandTypes.Configure;
-        arguments: ConfigureRequestArguments;
-    }
-    interface ConfigureResponse extends Response {
-    }
-    interface OpenRequestArgs extends FileRequestArgs {
-        fileContent?: string;
-        scriptKindName?: ScriptKindName;
-        projectRootPath?: string;
-    }
-    type ScriptKindName = "TS" | "JS" | "TSX" | "JSX";
-    interface OpenRequest extends Request {
-        command: CommandTypes.Open;
-        arguments: OpenRequestArgs;
-    }
-    interface OpenExternalProjectRequest extends Request {
-        command: CommandTypes.OpenExternalProject;
-        arguments: OpenExternalProjectArgs;
-    }
-    type OpenExternalProjectArgs = ExternalProject;
-    interface OpenExternalProjectsRequest extends Request {
-        command: CommandTypes.OpenExternalProjects;
-        arguments: OpenExternalProjectsArgs;
-    }
-    interface OpenExternalProjectsArgs {
-        projects: ExternalProject[];
-    }
-    interface OpenExternalProjectResponse extends Response {
-    }
-    interface OpenExternalProjectsResponse extends Response {
-    }
-    interface CloseExternalProjectRequest extends Request {
-        command: CommandTypes.CloseExternalProject;
-        arguments: CloseExternalProjectRequestArgs;
-    }
-    interface CloseExternalProjectRequestArgs {
-        projectFileName: string;
-    }
-    interface CloseExternalProjectResponse extends Response {
-    }
-    interface SynchronizeProjectListRequest extends Request {
-        arguments: SynchronizeProjectListRequestArgs;
-    }
-    interface SynchronizeProjectListRequestArgs {
-        knownProjects: protocol.ProjectVersionInfo[];
-    }
-    interface ApplyChangedToOpenFilesRequest extends Request {
-        arguments: ApplyChangedToOpenFilesRequestArgs;
-    }
-    interface ApplyChangedToOpenFilesRequestArgs {
-        openFiles?: ExternalFile[];
-        changedFiles?: ChangedOpenFile[];
-        closedFiles?: string[];
-    }
-    interface SetCompilerOptionsForInferredProjectsRequest extends Request {
-        command: CommandTypes.CompilerOptionsForInferredProjects;
-        arguments: SetCompilerOptionsForInferredProjectsArgs;
-    }
-    interface SetCompilerOptionsForInferredProjectsArgs {
-        options: ExternalProjectCompilerOptions;
-        projectRootPath?: string;
-    }
-    interface SetCompilerOptionsForInferredProjectsResponse extends Response {
-    }
-    interface ExitRequest extends Request {
-        command: CommandTypes.Exit;
-    }
-    interface CloseRequest extends FileRequest {
-        command: CommandTypes.Close;
-    }
-    interface CompileOnSaveAffectedFileListRequest extends FileRequest {
-        command: CommandTypes.CompileOnSaveAffectedFileList;
-    }
-    interface CompileOnSaveAffectedFileListSingleProject {
-        projectFileName: string;
-        fileNames: string[];
-        projectUsesOutFile: boolean;
-    }
-    interface CompileOnSaveAffectedFileListResponse extends Response {
-        body: CompileOnSaveAffectedFileListSingleProject[];
-    }
-    interface CompileOnSaveEmitFileRequest extends FileRequest {
-        command: CommandTypes.CompileOnSaveEmitFile;
-        arguments: CompileOnSaveEmitFileRequestArgs;
-    }
-    interface CompileOnSaveEmitFileRequestArgs extends FileRequestArgs {
-        forced?: boolean;
-    }
-    interface QuickInfoRequest extends FileLocationRequest {
-        command: CommandTypes.Quickinfo;
-    }
-    interface QuickInfoResponseBody {
-        kind: ScriptElementKind;
-        kindModifiers: string;
-        start: Location;
-        end: Location;
-        displayString: string;
-        documentation: string;
-        tags: JSDocTagInfo[];
-    }
-    interface QuickInfoResponse extends Response {
-        body?: QuickInfoResponseBody;
-    }
-    interface FormatRequestArgs extends FileLocationRequestArgs {
-        endLine: number;
-        endOffset: number;
-        endPosition?: number;
-        options?: FormatCodeSettings;
-    }
-    interface FormatRequest extends FileLocationRequest {
-        command: CommandTypes.Format;
-        arguments: FormatRequestArgs;
-    }
-    interface CodeEdit {
-        start: Location;
-        end: Location;
-        newText: string;
-    }
-    interface FileCodeEdits {
-        fileName: string;
-        textChanges: CodeEdit[];
-    }
-    interface CodeFixResponse extends Response {
-        body?: CodeFixAction[];
-    }
-    interface CodeAction {
-        description: string;
-        changes: FileCodeEdits[];
-        commands?: {}[];
-    }
-    interface CombinedCodeActions {
-        changes: ReadonlyArray<FileCodeEdits>;
-        commands?: ReadonlyArray<{}>;
-    }
-    interface CodeFixAction extends CodeAction {
-        fixName: string;
-        fixId?: {};
-        fixAllDescription?: string;
-    }
-    interface FormatResponse extends Response {
-        body?: CodeEdit[];
-    }
-    interface FormatOnKeyRequestArgs extends FileLocationRequestArgs {
-        key: string;
-        options?: FormatCodeSettings;
-    }
-    interface FormatOnKeyRequest extends FileLocationRequest {
-        command: CommandTypes.Formatonkey;
-        arguments: FormatOnKeyRequestArgs;
-    }
-    type CompletionsTriggerCharacter = "." | '"' | "'" | "`" | "/" | "@" | "<";
-    interface CompletionsRequestArgs extends FileLocationRequestArgs {
-        prefix?: string;
-        triggerCharacter?: CompletionsTriggerCharacter;
-        includeExternalModuleExports?: boolean;
-        includeInsertTextCompletions?: boolean;
-    }
-    interface CompletionsRequest extends FileLocationRequest {
-        command: CommandTypes.Completions;
-        arguments: CompletionsRequestArgs;
-    }
-    interface CompletionDetailsRequestArgs extends FileLocationRequestArgs {
-        entryNames: (string | CompletionEntryIdentifier)[];
-    }
-    interface CompletionEntryIdentifier {
-        name: string;
-        source?: string;
-    }
-    interface CompletionDetailsRequest extends FileLocationRequest {
-        command: CommandTypes.CompletionDetails;
-        arguments: CompletionDetailsRequestArgs;
-    }
-    interface SymbolDisplayPart {
-        text: string;
-        kind: string;
-    }
-    interface CompletionEntry {
-        name: string;
-        kind: ScriptElementKind;
-        kindModifiers?: string;
-        sortText: string;
-        insertText?: string;
-        replacementSpan?: TextSpan;
-        hasAction?: true;
-        source?: string;
-        isRecommended?: true;
-    }
-    interface CompletionEntryDetails {
-        name: string;
-        kind: ScriptElementKind;
-        kindModifiers: string;
-        displayParts: SymbolDisplayPart[];
-        documentation?: SymbolDisplayPart[];
-        tags?: JSDocTagInfo[];
-        codeActions?: CodeAction[];
-        source?: SymbolDisplayPart[];
-    }
-    interface CompletionsResponse extends Response {
-        body?: CompletionEntry[];
-    }
-    interface CompletionDetailsResponse extends Response {
-        body?: CompletionEntryDetails[];
-    }
-    interface SignatureHelpParameter {
-        name: string;
-        documentation: SymbolDisplayPart[];
-        displayParts: SymbolDisplayPart[];
-        isOptional: boolean;
-    }
-    interface SignatureHelpItem {
-        isVariadic: boolean;
-        prefixDisplayParts: SymbolDisplayPart[];
-        suffixDisplayParts: SymbolDisplayPart[];
-        separatorDisplayParts: SymbolDisplayPart[];
-        parameters: SignatureHelpParameter[];
-        documentation: SymbolDisplayPart[];
-        tags: JSDocTagInfo[];
-    }
-    interface SignatureHelpItems {
-        items: SignatureHelpItem[];
-        applicableSpan: TextSpan;
-        selectedItemIndex: number;
-        argumentIndex: number;
-        argumentCount: number;
-    }
-    interface SignatureHelpRequestArgs extends FileLocationRequestArgs {
-    }
-    interface SignatureHelpRequest extends FileLocationRequest {
-        command: CommandTypes.SignatureHelp;
-        arguments: SignatureHelpRequestArgs;
-    }
-    interface SignatureHelpResponse extends Response {
-        body?: SignatureHelpItems;
-    }
-    interface SemanticDiagnosticsSyncRequest extends FileRequest {
-        command: CommandTypes.SemanticDiagnosticsSync;
-        arguments: SemanticDiagnosticsSyncRequestArgs;
-    }
-    interface SemanticDiagnosticsSyncRequestArgs extends FileRequestArgs {
-        includeLinePosition?: boolean;
-    }
-    interface SemanticDiagnosticsSyncResponse extends Response {
-        body?: Diagnostic[] | DiagnosticWithLinePosition[];
-    }
-    interface SuggestionDiagnosticsSyncRequest extends FileRequest {
-        command: CommandTypes.SuggestionDiagnosticsSync;
-        arguments: SuggestionDiagnosticsSyncRequestArgs;
-    }
-    type SuggestionDiagnosticsSyncRequestArgs = SemanticDiagnosticsSyncRequestArgs;
-    type SuggestionDiagnosticsSyncResponse = SemanticDiagnosticsSyncResponse;
-    interface SyntacticDiagnosticsSyncRequest extends FileRequest {
-        command: CommandTypes.SyntacticDiagnosticsSync;
-        arguments: SyntacticDiagnosticsSyncRequestArgs;
-    }
-    interface SyntacticDiagnosticsSyncRequestArgs extends FileRequestArgs {
-        includeLinePosition?: boolean;
-    }
-    interface SyntacticDiagnosticsSyncResponse extends Response {
-        body?: Diagnostic[] | DiagnosticWithLinePosition[];
-    }
-    interface GeterrForProjectRequestArgs {
-        file: string;
-        delay: number;
-    }
-    interface GeterrForProjectRequest extends Request {
-        command: CommandTypes.GeterrForProject;
-        arguments: GeterrForProjectRequestArgs;
-    }
-    interface GeterrRequestArgs {
-        files: string[];
-        delay: number;
-    }
-    interface GeterrRequest extends Request {
-        command: CommandTypes.Geterr;
-        arguments: GeterrRequestArgs;
-    }
-    type RequestCompletedEventName = "requestCompleted";
-    interface RequestCompletedEvent extends Event {
-        event: RequestCompletedEventName;
-        body: RequestCompletedEventBody;
-    }
-    interface RequestCompletedEventBody {
-        request_seq: number;
-    }
-    interface Diagnostic {
-        start: Location;
-        end: Location;
-        text: string;
-        category: string;
-        reportsUnnecessary?: {};
-        code?: number;
-        source?: string;
-    }
-    interface DiagnosticWithFileName extends Diagnostic {
-        fileName: string;
-    }
-    interface DiagnosticEventBody {
-        file: string;
-        diagnostics: Diagnostic[];
-    }
-    type DiagnosticEventKind = "semanticDiag" | "syntaxDiag" | "suggestionDiag";
-    interface DiagnosticEvent extends Event {
-        body?: DiagnosticEventBody;
-    }
-    interface ConfigFileDiagnosticEventBody {
-        triggerFile: string;
-        configFile: string;
-        diagnostics: DiagnosticWithFileName[];
-    }
-    interface ConfigFileDiagnosticEvent extends Event {
-        body?: ConfigFileDiagnosticEventBody;
-        event: "configFileDiag";
-    }
-    type ProjectLanguageServiceStateEventName = "projectLanguageServiceState";
-    interface ProjectLanguageServiceStateEvent extends Event {
-        event: ProjectLanguageServiceStateEventName;
-        body?: ProjectLanguageServiceStateEventBody;
-    }
-    interface ProjectLanguageServiceStateEventBody {
-        projectName: string;
-        languageServiceEnabled: boolean;
-    }
-    type ProjectsUpdatedInBackgroundEventName = "projectsUpdatedInBackground";
-    interface ProjectsUpdatedInBackgroundEvent extends Event {
-        event: ProjectsUpdatedInBackgroundEventName;
-        body: ProjectsUpdatedInBackgroundEventBody;
-    }
-    interface ProjectsUpdatedInBackgroundEventBody {
-        openFiles: string[];
-    }
-    interface ReloadRequestArgs extends FileRequestArgs {
-        tmpfile: string;
-    }
-    interface ReloadRequest extends FileRequest {
-        command: CommandTypes.Reload;
-        arguments: ReloadRequestArgs;
-    }
-    interface ReloadResponse extends Response {
-    }
-    interface SavetoRequestArgs extends FileRequestArgs {
-        tmpfile: string;
-    }
-    interface SavetoRequest extends FileRequest {
-        command: CommandTypes.Saveto;
-        arguments: SavetoRequestArgs;
-    }
-    interface NavtoRequestArgs extends FileRequestArgs {
-        searchValue: string;
-        maxResultCount?: number;
-        currentFileOnly?: boolean;
-        projectFileName?: string;
-    }
-    interface NavtoRequest extends FileRequest {
-        command: CommandTypes.Navto;
-        arguments: NavtoRequestArgs;
-    }
-    interface NavtoItem {
-        name: string;
-        kind: ScriptElementKind;
-        matchKind?: string;
-        isCaseSensitive?: boolean;
-        kindModifiers?: string;
-        file: string;
-        start: Location;
-        end: Location;
-        containerName?: string;
-        containerKind?: ScriptElementKind;
-    }
-    interface NavtoResponse extends Response {
-        body?: NavtoItem[];
-    }
-    interface ChangeRequestArgs extends FormatRequestArgs {
-        insertString?: string;
-    }
-    interface ChangeRequest extends FileLocationRequest {
-        command: CommandTypes.Change;
-        arguments: ChangeRequestArgs;
-    }
-    interface BraceResponse extends Response {
-        body?: TextSpan[];
-    }
-    interface BraceRequest extends FileLocationRequest {
-        command: CommandTypes.Brace;
-    }
-    interface NavBarRequest extends FileRequest {
-        command: CommandTypes.NavBar;
-    }
-    interface NavTreeRequest extends FileRequest {
-        command: CommandTypes.NavTree;
-    }
-    interface NavigationBarItem {
-        text: string;
-        kind: ScriptElementKind;
-        kindModifiers?: string;
-        spans: TextSpan[];
-        childItems?: NavigationBarItem[];
-        indent: number;
-    }
-    interface NavigationTree {
-        text: string;
-        kind: ScriptElementKind;
-        kindModifiers: string;
-        spans: TextSpan[];
-        nameSpan: TextSpan | undefined;
-        childItems?: NavigationTree[];
-    }
-    type TelemetryEventName = "telemetry";
-    interface TelemetryEvent extends Event {
-        event: TelemetryEventName;
-        body: TelemetryEventBody;
-    }
-    interface TelemetryEventBody {
-        telemetryEventName: string;
-        payload: any;
-    }
-    type TypesInstallerInitializationFailedEventName = "typesInstallerInitializationFailed";
-    interface TypesInstallerInitializationFailedEvent extends Event {
-        event: TypesInstallerInitializationFailedEventName;
-        body: TypesInstallerInitializationFailedEventBody;
-    }
-    interface TypesInstallerInitializationFailedEventBody {
-        message: string;
-    }
-    type TypingsInstalledTelemetryEventName = "typingsInstalled";
-    interface TypingsInstalledTelemetryEventBody extends TelemetryEventBody {
-        telemetryEventName: TypingsInstalledTelemetryEventName;
-        payload: TypingsInstalledTelemetryEventPayload;
-    }
-    interface TypingsInstalledTelemetryEventPayload {
-        installedPackages: string;
-        installSuccess: boolean;
-        typingsInstallerVersion: string;
-    }
-    type BeginInstallTypesEventName = "beginInstallTypes";
-    type EndInstallTypesEventName = "endInstallTypes";
-    interface BeginInstallTypesEvent extends Event {
-        event: BeginInstallTypesEventName;
-        body: BeginInstallTypesEventBody;
-    }
-    interface EndInstallTypesEvent extends Event {
-        event: EndInstallTypesEventName;
-        body: EndInstallTypesEventBody;
-    }
-    interface InstallTypesEventBody {
-        eventId: number;
-        packages: ReadonlyArray<string>;
-    }
-    interface BeginInstallTypesEventBody extends InstallTypesEventBody {
-    }
-    interface EndInstallTypesEventBody extends InstallTypesEventBody {
-        success: boolean;
-    }
-    interface NavBarResponse extends Response {
-        body?: NavigationBarItem[];
-    }
-    interface NavTreeResponse extends Response {
-        body?: NavigationTree;
-    }
-    enum IndentStyle {
-        None = "None",
-        Block = "Block",
-        Smart = "Smart"
-    }
-    interface EditorSettings {
-        baseIndentSize?: number;
-        indentSize?: number;
-        tabSize?: number;
-        newLineCharacter?: string;
-        convertTabsToSpaces?: boolean;
-        indentStyle?: IndentStyle | ts.IndentStyle;
-    }
-    interface FormatCodeSettings extends EditorSettings {
-        insertSpaceAfterCommaDelimiter?: boolean;
-        insertSpaceAfterSemicolonInForStatements?: boolean;
-        insertSpaceBeforeAndAfterBinaryOperators?: boolean;
-        insertSpaceAfterConstructor?: boolean;
-        insertSpaceAfterKeywordsInControlFlowStatements?: boolean;
-        insertSpaceAfterFunctionKeywordForAnonymousFunctions?: boolean;
-        insertSpaceAfterOpeningAndBeforeClosingNonemptyParenthesis?: boolean;
-        insertSpaceAfterOpeningAndBeforeClosingNonemptyBrackets?: boolean;
-        insertSpaceAfterOpeningAndBeforeClosingNonemptyBraces?: boolean;
-        insertSpaceAfterOpeningAndBeforeClosingTemplateStringBraces?: boolean;
-        insertSpaceAfterOpeningAndBeforeClosingJsxExpressionBraces?: boolean;
-        insertSpaceAfterTypeAssertion?: boolean;
-        insertSpaceBeforeFunctionParenthesis?: boolean;
-        placeOpenBraceOnNewLineForFunctions?: boolean;
-        placeOpenBraceOnNewLineForControlBlocks?: boolean;
-        insertSpaceBeforeTypeAnnotation?: boolean;
-    }
-    interface UserPreferences {
-        readonly disableSuggestions?: boolean;
-        readonly quotePreference?: "double" | "single";
-        readonly includeCompletionsForModuleExports?: boolean;
-        readonly includeCompletionsWithInsertText?: boolean;
-        readonly importModuleSpecifierPreference?: "relative" | "non-relative";
-        readonly allowTextChangesInNewFiles?: boolean;
-    }
-    interface CompilerOptions {
-        allowJs?: boolean;
-        allowSyntheticDefaultImports?: boolean;
-        allowUnreachableCode?: boolean;
-        allowUnusedLabels?: boolean;
-        alwaysStrict?: boolean;
-        baseUrl?: string;
-        charset?: string;
-        checkJs?: boolean;
-        declaration?: boolean;
-        declarationDir?: string;
-        disableSizeLimit?: boolean;
-        downlevelIteration?: boolean;
-        emitBOM?: boolean;
-        emitDecoratorMetadata?: boolean;
-        experimentalDecorators?: boolean;
-        forceConsistentCasingInFileNames?: boolean;
-        importHelpers?: boolean;
-        inlineSourceMap?: boolean;
-        inlineSources?: boolean;
-        isolatedModules?: boolean;
-        jsx?: JsxEmit | ts.JsxEmit;
-        lib?: string[];
-        locale?: string;
-        mapRoot?: string;
-        maxNodeModuleJsDepth?: number;
-        module?: ModuleKind | ts.ModuleKind;
-        moduleResolution?: ModuleResolutionKind | ts.ModuleResolutionKind;
-        newLine?: NewLineKind | ts.NewLineKind;
-        noEmit?: boolean;
-        noEmitHelpers?: boolean;
-        noEmitOnError?: boolean;
-        noErrorTruncation?: boolean;
-        noFallthroughCasesInSwitch?: boolean;
-        noImplicitAny?: boolean;
-        noImplicitReturns?: boolean;
-        noImplicitThis?: boolean;
-        noUnusedLocals?: boolean;
-        noUnusedParameters?: boolean;
-        noImplicitUseStrict?: boolean;
-        noLib?: boolean;
-        noResolve?: boolean;
-        out?: string;
-        outDir?: string;
-        outFile?: string;
-        paths?: MapLike<string[]>;
-        plugins?: PluginImport[];
-        preserveConstEnums?: boolean;
-        preserveSymlinks?: boolean;
-        project?: string;
-        reactNamespace?: string;
-        removeComments?: boolean;
-        references?: ProjectReference[];
-        rootDir?: string;
-        rootDirs?: string[];
-        skipLibCheck?: boolean;
-        skipDefaultLibCheck?: boolean;
-        sourceMap?: boolean;
-        sourceRoot?: string;
-        strict?: boolean;
-        strictNullChecks?: boolean;
-        suppressExcessPropertyErrors?: boolean;
-        suppressImplicitAnyIndexErrors?: boolean;
-        target?: ScriptTarget | ts.ScriptTarget;
-        traceResolution?: boolean;
-        resolveJsonModule?: boolean;
-        types?: string[];
-        typeRoots?: string[];
-        [option: string]: CompilerOptionsValue | undefined;
-    }
-    enum JsxEmit {
-        None = "None",
-        Preserve = "Preserve",
-        ReactNative = "ReactNative",
-        React = "React"
-    }
-    enum ModuleKind {
-        None = "None",
-        CommonJS = "CommonJS",
-        AMD = "AMD",
-        UMD = "UMD",
-        System = "System",
-        ES6 = "ES6",
-        ES2015 = "ES2015",
-        ESNext = "ESNext"
-    }
-    enum ModuleResolutionKind {
-        Classic = "Classic",
-        Node = "Node"
-    }
-    enum NewLineKind {
-        Crlf = "Crlf",
-        Lf = "Lf"
-    }
-    enum ScriptTarget {
-        ES3 = "ES3",
-        ES5 = "ES5",
-        ES6 = "ES6",
-        ES2015 = "ES2015",
-        ES2016 = "ES2016",
-        ES2017 = "ES2017",
-        ESNext = "ESNext"
-    }
-}
-declare namespace ts.server {
-    class TextStorage {
-        private readonly host;
-        private readonly fileName;
-        private svc;
-        private svcVersion;
-        private text;
-        private lineMap;
-        private textVersion;
-        isOpen: boolean;
-        private ownFileText;
-        private pendingReloadFromDisk;
-        constructor(host: ServerHost, fileName: NormalizedPath);
-        getVersion(): string;
-        hasScriptVersionCache_TestOnly(): boolean;
-        useScriptVersionCache_TestOnly(): void;
-        useText(newText?: string): void;
-        edit(start: number, end: number, newText: string): void;
-        reload(newText: string): true | undefined;
-        reloadWithFileText(tempFileName?: string): true | undefined;
-        reloadFromDisk(): boolean | undefined;
-        delayReloadFromFileIntoText(): void;
-        getSnapshot(): IScriptSnapshot;
-        getLineInfo(line: number): AbsolutePositionAndLineText;
-        lineToTextSpan(line: number): TextSpan;
-        lineOffsetToPosition(line: number, offset: number): number;
-        positionToLineOffset(position: number): protocol.Location;
-        private getFileText;
-        private switchToScriptVersionCache;
-        private useScriptVersionCacheIfValidOrOpen;
-        private getOrLoadText;
-        private getLineMap;
-    }
-    function isDynamicFileName(fileName: NormalizedPath): boolean;
-    interface DocumentRegistrySourceFileCache {
-        key: DocumentRegistryBucketKey;
-        sourceFile: SourceFile;
-    }
-    class ScriptInfo {
-        private readonly host;
-        readonly fileName: NormalizedPath;
-        readonly scriptKind: ScriptKind;
-        readonly hasMixedContent: boolean;
-        readonly path: Path;
-        readonly containingProjects: Project[];
-        private formatSettings;
-        private preferences;
-        fileWatcher: FileWatcher | undefined;
-        private textStorage;
-        readonly isDynamic: boolean;
-        private realpath;
-        cacheSourceFile: DocumentRegistrySourceFileCache;
-        constructor(host: ServerHost, fileName: NormalizedPath, scriptKind: ScriptKind, hasMixedContent: boolean, path: Path);
-        isDynamicOrHasMixedContent(): boolean;
-        isScriptOpen(): boolean;
-        open(newText: string): void;
-        close(fileExists?: boolean): void;
-        getSnapshot(): IScriptSnapshot;
-        private ensureRealPath;
-        getRealpathIfDifferent(): Path | undefined;
-        getFormatCodeSettings(): FormatCodeSettings | undefined;
-        getPreferences(): UserPreferences | undefined;
-        attachToProject(project: Project): boolean;
-        isAttached(project: Project): boolean;
-        detachFromProject(project: Project): void;
-        detachAllProjects(): void;
-        getDefaultProject(): Project;
-        registerFileUpdate(): void;
-        setOptions(formatSettings: FormatCodeSettings, preferences: UserPreferences | undefined): void;
-        getLatestVersion(): string;
-        saveTo(fileName: string): void;
-        delayReloadNonMixedContentFile(): void;
-        reloadFromFile(tempFileName?: NormalizedPath): void;
-        getLineInfo(line: number): AbsolutePositionAndLineText;
-        editContent(start: number, end: number, newText: string): void;
-        markContainingProjectsAsDirty(): void;
-        isOrphan(): boolean;
-        lineToTextSpan(line: number): TextSpan;
-        lineOffsetToPosition(line: number, offset: number): number;
-        positionToLineOffset(position: number): protocol.Location;
-        isJavaScript(): boolean;
-    }
-}
-declare namespace ts.server {
-    interface InstallPackageOptionsWithProject extends InstallPackageOptions {
-        projectName: string;
-        projectRootPath: Path;
-    }
-    interface ITypingsInstaller {
-        isKnownTypesPackageName(name: string): boolean;
-        installPackage(options: InstallPackageOptionsWithProject): Promise<ApplyCodeActionCommandResult>;
-        enqueueInstallTypingsRequest(p: Project, typeAcquisition: TypeAcquisition, unresolvedImports: SortedReadonlyArray<string> | undefined): void;
-        attach(projectService: ProjectService): void;
-        onProjectClosed(p: Project): void;
-        readonly globalTypingsCacheLocation: string | undefined;
-    }
-    const nullTypingsInstaller: ITypingsInstaller;
-    class TypingsCache {
-        private readonly installer;
-        private readonly perProjectCache;
-        constructor(installer: ITypingsInstaller);
-        isKnownTypesPackageName(name: string): boolean;
-        installPackage(options: InstallPackageOptionsWithProject): Promise<ApplyCodeActionCommandResult>;
-        enqueueInstallTypingsForProject(project: Project, unresolvedImports: SortedReadonlyArray<string> | undefined, forceRefresh: boolean): void;
-        updateTypingsForProject(projectName: string, compilerOptions: CompilerOptions, typeAcquisition: TypeAcquisition, unresolvedImports: SortedReadonlyArray<string>, newTypings: string[]): SortedReadonlyArray<never> | SortedArray<string>;
-        onProjectClosed(project: Project): void;
-    }
-}
-declare namespace ts.server {
-    enum ProjectKind {
-        Inferred = 0,
-        Configured = 1,
-        External = 2
-    }
-    type Mutable<T> = {
-        -readonly [K in keyof T]: T[K];
-    };
-    function countEachFileTypes(infos: ScriptInfo[]): FileStats;
-    function allRootFilesAreJsOrDts(project: Project): boolean;
-    function allFilesAreJsOrDts(project: Project): boolean;
-    function hasNoTypeScriptSource(fileNames: string[]): boolean;
-    interface ProjectFilesWithTSDiagnostics extends protocol.ProjectFiles {
-        projectErrors: ReadonlyArray<Diagnostic>;
-    }
-    interface PluginCreateInfo {
-        project: Project;
-        languageService: LanguageService;
-        languageServiceHost: LanguageServiceHost;
-        serverHost: ServerHost;
-        config: any;
-    }
-    interface PluginModule {
-        create(createInfo: PluginCreateInfo): LanguageService;
-        getExternalFiles?(proj: Project): string[];
-    }
-    type PluginModuleFactory = (mod: {
-        typescript: typeof ts;
-    }) => PluginModule;
-    type ProjectRoot = ScriptInfo | NormalizedPath;
-    function isScriptInfo(value: ProjectRoot): value is ScriptInfo;
-    abstract class Project implements LanguageServiceHost, ModuleResolutionHost {
-        readonly projectName: string;
-        readonly projectKind: ProjectKind;
-        readonly projectService: ProjectService;
-        private documentRegistry;
-        private compilerOptions;
-        compileOnSaveEnabled: boolean;
-        private rootFiles;
-        private rootFilesMap;
-        private program;
-        private externalFiles;
-        private missingFilesMap;
-        private plugins;
-        cachedUnresolvedImportsPerFile: Map<ReadonlyArray<string>>;
-        lastCachedUnresolvedImportsList: SortedReadonlyArray<string> | undefined;
-        private hasAddedorRemovedFiles;
-        private lastFileExceededProgramSize;
-        protected languageService: LanguageService;
-        languageServiceEnabled: boolean;
-        readonly trace?: (s: string) => void;
-        readonly realpath?: (path: string) => string;
-        hasInvalidatedResolution: HasInvalidatedResolution;
-        resolutionCache: ResolutionCache;
-        private builderState;
-        private updatedFileNames;
-        private lastReportedFileNames;
-        private lastReportedVersion;
-        private projectProgramVersion;
-        private projectStateVersion;
-        dirty: boolean;
-        hasChangedAutomaticTypeDirectiveNames: boolean;
-        typingFiles: SortedReadonlyArray<string>;
-        private readonly cancellationToken;
-        isNonTsProject(): boolean;
-        isJsOnlyProject(): boolean;
-        static resolveModule(moduleName: string, initialDir: string, host: ServerHost, log: (message: string) => void): {} | undefined;
-        readonly currentDirectory: string;
-        directoryStructureHost: DirectoryStructureHost;
-        readonly getCanonicalFileName: GetCanonicalFileName;
-        constructor(projectName: string, projectKind: ProjectKind, projectService: ProjectService, documentRegistry: DocumentRegistry, hasExplicitListOfFiles: boolean, lastFileExceededProgramSize: string | undefined, compilerOptions: CompilerOptions, compileOnSaveEnabled: boolean, directoryStructureHost: DirectoryStructureHost, currentDirectory: string | undefined);
-        isKnownTypesPackageName(name: string): boolean;
-        installPackage(options: InstallPackageOptions): Promise<ApplyCodeActionCommandResult>;
-        private readonly typingsCache;
-        getCompilationSettings(): CompilerOptions;
-        getCompilerOptions(): CompilerOptions;
-        getNewLine(): string;
-        getProjectVersion(): string;
-        getProjectReferences(): ReadonlyArray<ProjectReference> | undefined;
-        getScriptFileNames(): string[];
-        private getOrCreateScriptInfoAndAttachToProject;
-        getScriptKind(fileName: string): ScriptKind;
-        getScriptVersion(filename: string): string;
-        getScriptSnapshot(filename: string): IScriptSnapshot | undefined;
-        getCancellationToken(): HostCancellationToken;
-        getCurrentDirectory(): string;
-        getDefaultLibFileName(): string;
-        useCaseSensitiveFileNames(): boolean;
-        readDirectory(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
-        readFile(fileName: string): string | undefined;
-        fileExists(file: string): boolean;
-        resolveModuleNames(moduleNames: string[], containingFile: string, reusedNames?: string[]): ResolvedModuleFull[];
-        getResolvedModuleWithFailedLookupLocationsFromCache(moduleName: string, containingFile: string): ResolvedModuleWithFailedLookupLocations | undefined;
-        resolveTypeReferenceDirectives(typeDirectiveNames: string[], containingFile: string): ResolvedTypeReferenceDirective[];
-        directoryExists(path: string): boolean;
-        getDirectories(path: string): string[];
-        getCachedDirectoryStructureHost(): CachedDirectoryStructureHost;
-        toPath(fileName: string): Path;
-        watchDirectoryOfFailedLookupLocation(directory: string, cb: DirectoryWatcherCallback, flags: WatchDirectoryFlags): FileWatcher;
-        onInvalidatedResolution(): void;
-        watchTypeRootsDirectory(directory: string, cb: DirectoryWatcherCallback, flags: WatchDirectoryFlags): FileWatcher;
-        onChangedAutomaticTypeDirectiveNames(): void;
-        getGlobalCache(): string | undefined;
-        writeLog(s: string): void;
-        log(s: string): void;
-        error(s: string): void;
-        private setInternalCompilerOptionsForEmittingJsFiles;
-        getGlobalProjectErrors(): ReadonlyArray<Diagnostic>;
-        getAllProjectErrors(): ReadonlyArray<Diagnostic>;
-        getLanguageService(ensureSynchronized?: boolean): LanguageService;
-        private shouldEmitFile;
-        getCompileOnSaveAffectedFileList(scriptInfo: ScriptInfo): string[];
-        emitFile(scriptInfo: ScriptInfo, writeFile: (path: string, data: string, writeByteOrderMark?: boolean) => void): boolean;
-        enableLanguageService(): void;
-        disableLanguageService(lastFileExceededProgramSize?: string): void;
-        getProjectName(): string;
-        abstract getTypeAcquisition(): TypeAcquisition;
-        protected removeLocalTypingsFromTypeAcquisition(newTypeAcquisition: TypeAcquisition): TypeAcquisition;
-        getExternalFiles(): SortedReadonlyArray<string>;
-        getSourceFile(path: Path): SourceFile | undefined;
-        getSourceFileOrConfigFile(path: Path): SourceFile | undefined;
-        close(): void;
-        private detachScriptInfoIfNotRoot;
-        isClosed(): boolean;
-        hasRoots(): boolean;
-        isOrphan(): boolean;
-        getRootFiles(): NormalizedPath[];
-        getRootFilesMap(): Map<ProjectRoot>;
-        getRootScriptInfos(): ScriptInfo[];
-        getScriptInfos(): ScriptInfo[];
-        getExcludedFiles(): ReadonlyArray<NormalizedPath>;
-        getFileNames(excludeFilesFromExternalLibraries?: boolean, excludeConfigFiles?: boolean): NormalizedPath[];
-        hasConfigFile(configFilePath: NormalizedPath): boolean;
-        containsScriptInfo(info: ScriptInfo): boolean;
-        containsFile(filename: NormalizedPath, requireOpen?: boolean): boolean;
-        isRoot(info: ScriptInfo): boolean;
-        addRoot(info: ScriptInfo): void;
-        addMissingFileRoot(fileName: NormalizedPath): void;
-        removeFile(info: ScriptInfo, fileExists: boolean, detachFromProject: boolean): void;
-        registerFileUpdate(fileName: string): void;
-        markAsDirty(): void;
-        private extractUnresolvedImportsFromSourceFile;
-        onFileAddedOrRemoved(): void;
-        updateGraph(): boolean;
-        updateTypingFiles(typingFiles: SortedReadonlyArray<string>): void;
-        getCurrentProgram(): Program;
-        protected removeExistingTypings(include: string[]): string[];
-        private updateGraphWorker;
-        private detachScriptInfoFromProject;
-        private addMissingFileWatcher;
-        private isWatchedMissingFile;
-        getScriptInfoForNormalizedPath(fileName: NormalizedPath): ScriptInfo | undefined;
-        getScriptInfo(uncheckedFileName: string): ScriptInfo | undefined;
-        filesToString(writeProjectFileNames: boolean): string;
-        setCompilerOptions(compilerOptions: CompilerOptions): void;
-        getChangesSinceVersion(lastKnownVersion?: number): ProjectFilesWithTSDiagnostics;
-        protected removeRoot(info: ScriptInfo): void;
-        protected enableGlobalPlugins(): void;
-        protected enablePlugin(pluginConfigEntry: PluginImport, searchPaths: string[]): void;
-        refreshDiagnostics(): void;
-        private enableProxy;
-    }
-    class InferredProject extends Project {
-        private static readonly newName;
-        private _isJsInferredProject;
-        toggleJsInferredProject(isJsInferredProject: boolean): void;
-        setCompilerOptions(options?: CompilerOptions): void;
-        readonly projectRootPath: string | undefined;
-        readonly canonicalCurrentDirectory: string | undefined;
-        constructor(projectService: ProjectService, documentRegistry: DocumentRegistry, compilerOptions: CompilerOptions, projectRootPath: NormalizedPath | undefined, currentDirectory: string | undefined);
-        addRoot(info: ScriptInfo): void;
-        removeRoot(info: ScriptInfo): void;
-        isOrphan(): boolean;
-        isProjectWithSingleRoot(): boolean;
-        close(): void;
-        getTypeAcquisition(): TypeAcquisition;
-    }
-    class ConfiguredProject extends Project {
-        compileOnSaveEnabled: boolean;
-        private projectReferences;
-        private typeAcquisition;
-        configFileWatcher: FileWatcher | undefined;
-        private directoriesWatchedForWildcards;
-        readonly canonicalConfigFilePath: NormalizedPath;
-        pendingReload: ConfigFileProgramReloadLevel;
-        configFileSpecs: ConfigFileSpecs | undefined;
-        private externalProjectRefCount;
-        private projectErrors;
-        constructor(configFileName: NormalizedPath, projectService: ProjectService, documentRegistry: DocumentRegistry, hasExplicitListOfFiles: boolean, compilerOptions: CompilerOptions, lastFileExceededProgramSize: string | undefined, compileOnSaveEnabled: boolean, cachedDirectoryStructureHost: CachedDirectoryStructureHost, projectReferences: ReadonlyArray<ProjectReference> | undefined);
-        updateGraph(): boolean;
-        getCachedDirectoryStructureHost(): CachedDirectoryStructureHost;
-        getConfigFilePath(): NormalizedPath;
-        getProjectReferences(): ReadonlyArray<ProjectReference> | undefined;
-        updateReferences(refs: ReadonlyArray<ProjectReference> | undefined): void;
-        enablePlugins(): void;
-        getGlobalProjectErrors(): ReadonlyArray<Diagnostic>;
-        getAllProjectErrors(): ReadonlyArray<Diagnostic>;
-        setProjectErrors(projectErrors: Diagnostic[]): void;
-        setTypeAcquisition(newTypeAcquisition: TypeAcquisition): void;
-        getTypeAcquisition(): TypeAcquisition;
-        watchWildcards(wildcardDirectories: Map<WatchDirectoryFlags>): void;
-        stopWatchingWildCards(): void;
-        close(): void;
-        addExternalProjectReference(): void;
-        deleteExternalProjectReference(): void;
-        hasOpenRef(): boolean;
-        getEffectiveTypeRoots(): string[];
-        updateErrorOnNoInputFiles(hasFileNames: boolean): void;
-    }
-    class ExternalProject extends Project {
-        externalProjectName: string;
-        compileOnSaveEnabled: boolean;
-        excludedFiles: ReadonlyArray<NormalizedPath>;
-        private typeAcquisition;
-        constructor(externalProjectName: string, projectService: ProjectService, documentRegistry: DocumentRegistry, compilerOptions: CompilerOptions, lastFileExceededProgramSize: string | undefined, compileOnSaveEnabled: boolean, projectFilePath?: string);
-        getExcludedFiles(): ReadonlyArray<NormalizedPath>;
-        getTypeAcquisition(): TypeAcquisition;
-        setTypeAcquisition(newTypeAcquisition: TypeAcquisition): void;
-    }
-}
-declare namespace ts.server {
-    const maxProgramSizeForNonTsFiles: number;
-    const ProjectsUpdatedInBackgroundEvent = "projectsUpdatedInBackground";
-    const ConfigFileDiagEvent = "configFileDiag";
-    const ProjectLanguageServiceStateEvent = "projectLanguageServiceState";
-    const ProjectInfoTelemetryEvent = "projectInfo";
-    const OpenFileInfoTelemetryEvent = "openFileInfo";
-    interface ProjectsUpdatedInBackgroundEvent {
-        eventName: typeof ProjectsUpdatedInBackgroundEvent;
-        data: {
-            openFiles: string[];
-        };
-    }
-    interface ConfigFileDiagEvent {
-        eventName: typeof ConfigFileDiagEvent;
-        data: {
-            triggerFile: string;
-            configFileName: string;
-            diagnostics: ReadonlyArray<Diagnostic>;
-        };
-    }
-    interface ProjectLanguageServiceStateEvent {
-        eventName: typeof ProjectLanguageServiceStateEvent;
-        data: {
-            project: Project;
-            languageServiceEnabled: boolean;
-        };
-    }
-    interface ProjectInfoTelemetryEvent {
-        readonly eventName: typeof ProjectInfoTelemetryEvent;
-        readonly data: ProjectInfoTelemetryEventData;
-    }
-    interface ProjectInfoTelemetryEventData {
-        readonly projectId: string;
-        readonly fileStats: FileStats;
-        readonly compilerOptions: CompilerOptions;
-        readonly extends: boolean | undefined;
-        readonly files: boolean | undefined;
-        readonly include: boolean | undefined;
-        readonly exclude: boolean | undefined;
-        readonly compileOnSave: boolean;
-        readonly typeAcquisition: ProjectInfoTypeAcquisitionData;
-        readonly configFileName: "tsconfig.json" | "jsconfig.json" | "other";
-        readonly projectType: "external" | "configured";
-        readonly languageServiceEnabled: boolean;
-        readonly version: string;
-    }
-    interface OpenFileInfoTelemetryEvent {
-        readonly eventName: typeof OpenFileInfoTelemetryEvent;
-        readonly data: OpenFileInfoTelemetryEventData;
-    }
-    interface OpenFileInfoTelemetryEventData {
-        readonly info: OpenFileInfo;
-    }
-    interface ProjectInfoTypeAcquisitionData {
-        readonly enable: boolean | undefined;
-        readonly include: boolean;
-        readonly exclude: boolean;
-    }
-    interface FileStats {
-        readonly js: number;
-        readonly jsx: number;
-        readonly ts: number;
-        readonly tsx: number;
-        readonly dts: number;
-        readonly deferred: number;
-    }
-    interface OpenFileInfo {
-        readonly checkJs: boolean;
-    }
-    type ProjectServiceEvent = ProjectsUpdatedInBackgroundEvent | ConfigFileDiagEvent | ProjectLanguageServiceStateEvent | ProjectInfoTelemetryEvent | OpenFileInfoTelemetryEvent;
-    type ProjectServiceEventHandler = (event: ProjectServiceEvent) => void;
-    interface SafeList {
-        [name: string]: {
-            match: RegExp;
-            exclude?: (string | number)[][];
-            types?: string[];
-        };
-    }
-    interface TypesMapFile {
-        typesMap: SafeList;
-        simpleMap: {
-            [libName: string]: string;
-        };
-    }
-    function convertFormatOptions(protocolOptions: protocol.FormatCodeSettings): FormatCodeSettings;
-    function convertCompilerOptions(protocolOptions: protocol.ExternalProjectCompilerOptions): CompilerOptions & protocol.CompileOnSaveMixin;
-    function tryConvertScriptKindName(scriptKindName: protocol.ScriptKindName | ScriptKind): ScriptKind;
-    function convertScriptKindName(scriptKindName: protocol.ScriptKindName): ScriptKind.Unknown | ScriptKind.JS | ScriptKind.JSX | ScriptKind.TS | ScriptKind.TSX;
-    interface HostConfiguration {
-        formatCodeOptions: FormatCodeSettings;
-        preferences: UserPreferences;
-        hostInfo: string;
-        extraFileExtensions?: FileExtensionInfo[];
-    }
-    interface OpenConfiguredProjectResult {
-        configFileName?: NormalizedPath;
-        configFileErrors?: ReadonlyArray<Diagnostic>;
-    }
-    enum WatchType {
-        ConfigFilePath = "Config file for the program",
-        MissingFilePath = "Missing file from program",
-        WildcardDirectories = "Wild card directory",
-        ClosedScriptInfo = "Closed Script info",
-        ConfigFileForInferredRoot = "Config file for the inferred project root",
-        FailedLookupLocation = "Directory of Failed lookup locations in module resolution",
-        TypeRoots = "Type root directory"
-    }
-    interface ConfigFileExistenceInfo {
-        exists: boolean;
-        openFilesImpactedByConfigFile: Map<boolean>;
-        configFileWatcherForRootOfInferredProject?: FileWatcher;
-    }
-    interface ProjectServiceOptions {
-        host: ServerHost;
-        logger: Logger;
-        cancellationToken: HostCancellationToken;
-        useSingleInferredProject: boolean;
-        useInferredProjectPerProjectRoot: boolean;
-        typingsInstaller: ITypingsInstaller;
-        eventHandler?: ProjectServiceEventHandler;
-        suppressDiagnosticEvents?: boolean;
-        throttleWaitMilliseconds?: number;
-        globalPlugins?: ReadonlyArray<string>;
-        pluginProbeLocations?: ReadonlyArray<string>;
-        allowLocalPluginLoads?: boolean;
-        typesMapLocation?: string;
-        syntaxOnly?: boolean;
-    }
-    class ProjectService {
-        readonly typingsCache: TypingsCache;
-        readonly documentRegistry: DocumentRegistry;
-        private readonly filenameToScriptInfo;
-        private readonly allJsFilesForOpenFileTelemetry;
-        readonly realpathToScriptInfos: MultiMap<ScriptInfo> | undefined;
-        private readonly externalProjectToConfiguredProjectMap;
-        readonly externalProjects: ExternalProject[];
-        readonly inferredProjects: InferredProject[];
-        readonly configuredProjects: Map<ConfiguredProject>;
-        readonly openFiles: Map<NormalizedPath | undefined>;
-        private readonly openFilesWithNonRootedDiskPath;
-        private compilerOptionsForInferredProjects;
-        private compilerOptionsForInferredProjectsPerProjectRoot;
-        private readonly projectToSizeMap;
-        private readonly configFileExistenceInfoCache;
-        private readonly throttledOperations;
-        private readonly hostConfiguration;
-        private safelist;
-        private legacySafelist;
-        private pendingProjectUpdates;
-        pendingEnsureProjectForOpenFiles: boolean;
-        readonly currentDirectory: NormalizedPath;
-        readonly toCanonicalFileName: (f: string) => string;
-        readonly host: ServerHost;
-        readonly logger: Logger;
-        readonly cancellationToken: HostCancellationToken;
-        readonly useSingleInferredProject: boolean;
-        readonly useInferredProjectPerProjectRoot: boolean;
-        readonly typingsInstaller: ITypingsInstaller;
-        private readonly globalCacheLocationDirectoryPath;
-        readonly throttleWaitMilliseconds?: number;
-        private readonly eventHandler?;
-        private readonly suppressDiagnosticEvents?;
-        readonly globalPlugins: ReadonlyArray<string>;
-        readonly pluginProbeLocations: ReadonlyArray<string>;
-        readonly allowLocalPluginLoads: boolean;
-        readonly typesMapLocation: string | undefined;
-        readonly syntaxOnly?: boolean;
-        private readonly seenProjects;
-        readonly watchFactory: WatchFactory<WatchType, Project>;
-        constructor(opts: ProjectServiceOptions);
-        toPath(fileName: string): Path;
-        getExecutingFilePath(): string;
-        getNormalizedAbsolutePath(fileName: string): string;
-        setDocument(key: DocumentRegistryBucketKey, path: Path, sourceFile: SourceFile): void;
-        getDocument(key: DocumentRegistryBucketKey, path: Path): SourceFile | undefined;
-        ensureInferredProjectsUpToDate_TestOnly(): void;
-        getCompilerOptionsForInferredProjects(): CompilerOptions;
-        onUpdateLanguageServiceStateForProject(project: Project, languageServiceEnabled: boolean): void;
-        private loadTypesMap;
-        updateTypingsForProject(response: SetTypings | InvalidateCachedTypings | PackageInstalledResponse): void;
-        updateTypingsForProject(response: SetTypings | InvalidateCachedTypings | PackageInstalledResponse | BeginInstallTypes | EndInstallTypes): void;
-        private delayEnsureProjectForOpenFiles;
-        private delayUpdateProjectGraph;
-        hasPendingProjectUpdate(project: Project): boolean;
-        sendProjectsUpdatedInBackgroundEvent(): void;
-        delayUpdateProjectGraphAndEnsureProjectStructureForOpenFiles(project: Project): void;
-        private delayUpdateProjectGraphs;
-        setCompilerOptionsForInferredProjects(projectCompilerOptions: protocol.ExternalProjectCompilerOptions, projectRootPath?: string): void;
-        findProject(projectName: string): Project | undefined;
-        getDefaultProjectForFile(fileName: NormalizedPath, ensureProject: boolean): Project | undefined;
-        getScriptInfoEnsuringProjectsUptoDate(uncheckedFileName: string): ScriptInfo | undefined;
-        private ensureProjectStructuresUptoDate;
-        getFormatCodeOptions(file: NormalizedPath): FormatCodeSettings;
-        getPreferences(file: NormalizedPath): UserPreferences;
-        private onSourceFileChanged;
-        private handleDeletedFile;
-        watchWildcardDirectory(directory: Path, flags: WatchDirectoryFlags, project: ConfiguredProject): FileWatcher;
-        getConfigFileExistenceInfo(project: ConfiguredProject): ConfigFileExistenceInfo;
-        private onConfigChangedForConfiguredProject;
-        private onConfigFileChangeForOpenScriptInfo;
-        private removeProject;
-        assignOrphanScriptInfoToInferredProject(info: ScriptInfo, projectRootPath: NormalizedPath | undefined): InferredProject;
-        private closeOpenFile;
-        private deleteScriptInfo;
-        private configFileExists;
-        private setConfigFileExistenceByNewConfiguredProject;
-        private configFileExistenceImpactsRootOfInferredProject;
-        private setConfigFileExistenceInfoByClosedConfiguredProject;
-        private logConfigFileWatchUpdate;
-        private createConfigFileWatcherOfConfigFileExistence;
-        private closeConfigFileWatcherOfConfigFileExistenceInfo;
-        private stopWatchingConfigFilesForClosedScriptInfo;
-        startWatchingConfigFilesForInferredProjectRoot(info: ScriptInfo): void;
-        stopWatchingConfigFilesForInferredProjectRoot(info: ScriptInfo): void;
-        private forEachConfigFileLocation;
-        private getConfigFileNameForFile;
-        private printProjects;
-        private findConfiguredProjectByProjectName;
-        private getConfiguredProjectByCanonicalConfigFilePath;
-        private findExternalProjectByProjectName;
-        private convertConfigFileContentToProjectOptions;
-        private getFilenameForExceededTotalSizeLimitForNonTsFiles;
-        private createExternalProject;
-        private sendProjectTelemetry;
-        private addFilesToNonInferredProjectAndUpdateGraph;
-        private createConfiguredProject;
-        private updateNonInferredProjectFiles;
-        private updateNonInferredProject;
-        reloadFileNamesOfConfiguredProject(project: ConfiguredProject): boolean;
-        reloadConfiguredProject(project: ConfiguredProject): void;
-        private sendConfigFileDiagEvent;
-        private getOrCreateInferredProjectForProjectRootPathIfEnabled;
-        private getOrCreateSingleInferredProjectIfEnabled;
-        private getOrCreateSingleInferredWithoutProjectRoot;
-        private createInferredProject;
-        getOrCreateScriptInfoNotOpenedByClient(uncheckedFileName: string, currentDirectory: string, hostToQueryFileExistsOn: DirectoryStructureHost): ScriptInfo | undefined;
-        getScriptInfo(uncheckedFileName: string): ScriptInfo | undefined;
-        getSymlinkedProjects(info: ScriptInfo): MultiMap<Project> | undefined;
-        private watchClosedScriptInfo;
-        private stopWatchingScriptInfo;
-        getOrCreateScriptInfoNotOpenedByClientForNormalizedPath(fileName: NormalizedPath, currentDirectory: string, scriptKind: ScriptKind | undefined, hasMixedContent: boolean | undefined, hostToQueryFileExistsOn: DirectoryStructureHost | undefined): ScriptInfo | undefined;
-        getOrCreateScriptInfoOpenedByClientForNormalizedPath(fileName: NormalizedPath, currentDirectory: string, fileContent: string | undefined, scriptKind: ScriptKind | undefined, hasMixedContent: boolean | undefined): ScriptInfo | undefined;
-        getOrCreateScriptInfoForNormalizedPath(fileName: NormalizedPath, openedByClient: boolean, fileContent?: string, scriptKind?: ScriptKind, hasMixedContent?: boolean, hostToQueryFileExistsOn?: {
-            fileExists(path: string): boolean;
-        }): ScriptInfo | undefined;
-        private getOrCreateScriptInfoWorker;
-        getScriptInfoForNormalizedPath(fileName: NormalizedPath): ScriptInfo | undefined;
-        getScriptInfoForPath(fileName: Path): ScriptInfo | undefined;
-        setHostConfiguration(args: protocol.ConfigureRequestArguments): void;
-        closeLog(): void;
-        reloadProjects(): void;
-        private delayReloadConfiguredProjectForFiles;
-        private reloadConfiguredProjectForFiles;
-        private removeRootOfInferredProjectIfNowPartOfOtherProject;
-        private ensureProjectForOpenFiles;
-        openClientFile(fileName: string, fileContent?: string, scriptKind?: ScriptKind, projectRootPath?: string): OpenConfiguredProjectResult;
-        private findExternalProjectContainingOpenScriptInfo;
-        openClientFileWithNormalizedPath(fileName: NormalizedPath, fileContent?: string, scriptKind?: ScriptKind, hasMixedContent?: boolean, projectRootPath?: NormalizedPath): OpenConfiguredProjectResult;
-        private telemetryOnOpenFile;
-        closeClientFile(uncheckedFileName: string): void;
-        private collectChanges;
-        synchronizeProjectList(knownProjects: protocol.ProjectVersionInfo[]): ProjectFilesWithTSDiagnostics[];
-        applyChangesInOpenFiles(openFiles: protocol.ExternalFile[] | undefined, changedFiles: protocol.ChangedOpenFile[] | undefined, closedFiles: string[] | undefined): void;
-        applyChangesToFile(scriptInfo: ScriptInfo, changes: TextChange[]): void;
-        private closeConfiguredProjectReferencedFromExternalProject;
-        closeExternalProject(uncheckedFileName: string): void;
-        openExternalProjects(projects: protocol.ExternalProject[]): void;
-        private static readonly filenameEscapeRegexp;
-        private static escapeFilenameForRegex;
-        resetSafeList(): void;
-        applySafeList(proj: protocol.ExternalProject): NormalizedPath[];
-        openExternalProject(proj: protocol.ExternalProject): void;
-        hasDeferredExtension(): boolean;
-    }
-}
-declare namespace ts.server {
-    interface ServerCancellationToken extends HostCancellationToken {
-        setRequest(requestId: number): void;
-        resetRequest(requestId: number): void;
-    }
-    const nullCancellationToken: ServerCancellationToken;
-    interface PendingErrorCheck {
-        fileName: NormalizedPath;
-        project: Project;
-    }
-    type CommandNames = protocol.CommandTypes;
-    const CommandNames: any;
-    function formatMessage<T extends protocol.Message>(msg: T, logger: Logger, byteLength: (s: string, encoding: string) => number, newLine: string): string;
-    type Event = <T extends object>(body: T, eventName: string) => void;
-    interface EventSender {
-        event: Event;
-    }
-    function toEvent(eventName: string, body: object): protocol.Event;
-    interface SessionOptions {
-        host: ServerHost;
-        cancellationToken: ServerCancellationToken;
-        useSingleInferredProject: boolean;
-        useInferredProjectPerProjectRoot: boolean;
-        typingsInstaller: ITypingsInstaller;
-        byteLength: (buf: string, encoding?: string) => number;
-        hrtime: (start?: number[]) => number[];
-        logger: Logger;
-        canUseEvents: boolean;
-        eventHandler?: ProjectServiceEventHandler;
-        suppressDiagnosticEvents?: boolean;
-        syntaxOnly?: boolean;
-        throttleWaitMilliseconds?: number;
-        noGetErrOnBackgroundUpdate?: boolean;
-        globalPlugins?: ReadonlyArray<string>;
-        pluginProbeLocations?: ReadonlyArray<string>;
-        allowLocalPluginLoads?: boolean;
-    }
-    class Session implements EventSender {
-        private readonly gcTimer;
-        protected projectService: ProjectService;
-        private changeSeq;
-        private currentRequestId;
-        private errorCheck;
-        protected host: ServerHost;
-        private readonly cancellationToken;
-        protected readonly typingsInstaller: ITypingsInstaller;
-        protected byteLength: (buf: string, encoding?: string) => number;
-        private hrtime;
-        protected logger: Logger;
-        protected canUseEvents: boolean;
-        private suppressDiagnosticEvents?;
-        private eventHandler;
-        private readonly noGetErrOnBackgroundUpdate?;
-        constructor(opts: SessionOptions);
-        private sendRequestCompletedEvent;
-        private defaultEventHandler;
-        private projectsUpdatedInBackgroundEvent;
-        logError(err: Error, cmd: string): void;
-        send(msg: protocol.Message): void;
-        event<T extends object>(body: T, eventName: string): void;
-        output(info: any, cmdName: string, reqSeq?: number, errorMsg?: string): void;
-        private doOutput;
-        private semanticCheck;
-        private syntacticCheck;
-        private suggestionCheck;
-        private sendDiagnosticsEvent;
-        private updateErrorCheck;
-        private cleanProjects;
-        private cleanup;
-        private getEncodedSemanticClassifications;
-        private getProject;
-        private getConfigFileAndProject;
-        private getConfigFileDiagnostics;
-        private convertToDiagnosticsWithLinePositionFromDiagnosticFile;
-        private getCompilerOptionsDiagnostics;
-        private convertToDiagnosticsWithLinePosition;
-        private getDiagnosticsWorker;
-        private getDefinition;
-        private getDefinitionAndBoundSpan;
-        private mapDefinitionInfo;
-        private static mapToOriginalLocation;
-        private toFileSpan;
-        private getTypeDefinition;
-        private getImplementation;
-        private getOccurrences;
-        private getSyntacticDiagnosticsSync;
-        private getSemanticDiagnosticsSync;
-        private getSuggestionDiagnosticsSync;
-        private getJsxClosingTag;
-        private getDocumentHighlights;
-        private setCompilerOptionsForInferredProjects;
-        private getProjectInfo;
-        private getProjectInfoWorker;
-        private getRenameInfo;
-        private getProjects;
-        private getDefaultProject;
-        private getRenameLocations;
-        private getReferences;
-        private openClientFile;
-        private getPosition;
-        private getPositionInFile;
-        private getFileAndProject;
-        private getFileAndLanguageServiceForSyntacticOperation;
-        private getFileAndProjectWorker;
-        private getOutliningSpans;
-        private getTodoComments;
-        private getDocCommentTemplate;
-        private getSpanOfEnclosingComment;
-        private getIndentation;
-        private getBreakpointStatement;
-        private getNameOrDottedNameSpan;
-        private isValidBraceCompletion;
-        private getQuickInfoWorker;
-        private getFormattingEditsForRange;
-        private getFormattingEditsForRangeFull;
-        private getFormattingEditsForDocumentFull;
-        private getFormattingEditsAfterKeystrokeFull;
-        private getFormattingEditsAfterKeystroke;
-        private getCompletions;
-        private getCompletionEntryDetails;
-        private getCompileOnSaveAffectedFileList;
-        private emitFile;
-        private getSignatureHelpItems;
-        private createCheckList;
-        private getDiagnostics;
-        private change;
-        private reload;
-        private saveToTmp;
-        private closeClientFile;
-        private mapLocationNavigationBarItems;
-        private getNavigationBarItems;
-        private toLocationNavigationTree;
-        private toLocationTextSpan;
-        private getNavigationTree;
-        private getNavigateToItems;
-        private getSupportedCodeFixes;
-        private isLocation;
-        private extractPositionAndRange;
-        private getApplicableRefactors;
-        private getEditsForRefactor;
-        private organizeImports;
-        private getEditsForFileRename;
-        private getCodeFixes;
-        private getCombinedCodeFix;
-        private applyCodeActionCommand;
-        private getStartAndEndPosition;
-        private mapCodeAction;
-        private mapCodeFixAction;
-        private mapTextChangesToCodeEdits;
-        private convertTextChangeToCodeEdit;
-        private getBraceMatching;
-        private getDiagnosticsForProject;
-        getCanonicalFileName(fileName: string): string;
-        exit(): void;
-        private notRequired;
-        private requiredResponse;
-        private handlers;
-        addProtocolHandler(command: string, handler: (request: protocol.Request) => HandlerResponse): void;
-        private setCurrentRequest;
-        private resetCurrentRequest;
-        executeWithRequestId<T>(requestId: number, f: () => T): T;
-        executeCommand(request: protocol.Request): HandlerResponse;
-        onMessage(message: string): void;
-        private getFormatOptions;
-        private getPreferences;
-    }
-    interface HandlerResponse {
-        response?: {};
-        responseRequired?: boolean;
-    }
-    function getLocationInNewDocument(oldText: string, renameFilename: string, renameLocation: number, edits: ReadonlyArray<FileTextChanges>): protocol.Location;
-}
-declare namespace ts.server {
-    interface LineCollection {
-        charCount(): number;
-        lineCount(): number;
-        isLeaf(): this is LineLeaf;
-        walk(rangeStart: number, rangeLength: number, walkFns: LineIndexWalker): void;
-    }
-    interface AbsolutePositionAndLineText {
-        absolutePosition: number;
-        lineText: string | undefined;
-    }
-    enum CharRangeSection {
-        PreStart = 0,
-        Start = 1,
-        Entire = 2,
-        Mid = 3,
-        End = 4,
-        PostEnd = 5
-    }
-    interface LineIndexWalker {
-        goSubtree: boolean;
-        done: boolean;
-        leaf(relativeStart: number, relativeLength: number, lineCollection: LineLeaf): void;
-        pre?(relativeStart: number, relativeLength: number, lineCollection: LineCollection, parent: LineNode, nodeType: CharRangeSection): void;
-        post?(relativeStart: number, relativeLength: number, lineCollection: LineCollection, parent: LineNode, nodeType: CharRangeSection): void;
-    }
-    class ScriptVersionCache {
-        private changes;
-        private readonly versions;
-        private minVersion;
-        private currentVersion;
-        private static readonly changeNumberThreshold;
-        private static readonly changeLengthThreshold;
-        private static readonly maxVersions;
-        private versionToIndex;
-        private currentVersionToIndex;
-        edit(pos: number, deleteLen: number, insertedText?: string): void;
-        getSnapshot(): IScriptSnapshot;
-        private _getSnapshot;
-        getSnapshotVersion(): number;
-        getLineInfo(line: number): AbsolutePositionAndLineText;
-        lineOffsetToPosition(line: number, column: number): number;
-        positionToLineOffset(position: number): protocol.Location;
-        lineToTextSpan(line: number): TextSpan;
-        getTextChangesBetweenVersions(oldVersion: number, newVersion: number): TextChangeRange | undefined;
-        static fromString(script: string): ScriptVersionCache;
-    }
-    class LineIndex {
-        root: LineNode;
-        checkEdits: boolean;
-        absolutePositionOfStartOfLine(oneBasedLine: number): number;
-        positionToLineOffset(position: number): protocol.Location;
-        private positionToColumnAndLineText;
-        lineNumberToInfo(oneBasedLine: number): AbsolutePositionAndLineText;
-        load(lines: string[]): void;
-        walk(rangeStart: number, rangeLength: number, walkFns: LineIndexWalker): void;
-        getText(rangeStart: number, rangeLength: number): string;
-        getLength(): number;
-        every(f: (ll: LineLeaf, s: number, len: number) => boolean, rangeStart: number, rangeEnd?: number): boolean;
-        edit(pos: number, deleteLength: number, newText?: string): LineIndex;
-        private static buildTreeFromBottom;
-        static linesFromText(text: string): {
-            lines: string[];
-            lineMap: number[];
-        };
-    }
-    class LineNode implements LineCollection {
-        private readonly children;
-        totalChars: number;
-        totalLines: number;
-        constructor(children?: LineCollection[]);
-        isLeaf(): boolean;
-        updateCounts(): void;
-        private execWalk;
-        private skipChild;
-        walk(rangeStart: number, rangeLength: number, walkFns: LineIndexWalker): void;
-        charOffsetToLineInfo(lineNumberAccumulator: number, relativePosition: number): {
-            oneBasedLine: number;
-            zeroBasedColumn: number;
-            lineText: string | undefined;
-        };
-        lineNumberToInfo(relativeOneBasedLine: number, positionAccumulator: number): {
-            position: number;
-            leaf: LineLeaf | undefined;
-        };
-        private splitAfter;
-        remove(child: LineCollection): void;
-        private findChildIndex;
-        insertAt(child: LineCollection, nodes: LineCollection[]): LineNode[];
-        add(collection: LineCollection): void;
-        charCount(): number;
-        lineCount(): number;
-    }
-    class LineLeaf implements LineCollection {
-        text: string;
-        constructor(text: string);
-        isLeaf(): boolean;
-        walk(rangeStart: number, rangeLength: number, walkFns: LineIndexWalker): void;
-        charCount(): number;
-        lineCount(): number;
-    }
-}
-//# sourceMappingURL=server.d.ts.map
+declare namespace ts {
+    /** Gets a timestamp with (at least) ms resolution */
+    const timestamp: () => number;
+}
+/** Performance measurements for the compiler. */
+declare namespace ts.performance {
+    /**
+     * Marks a performance event.
+     *
+     * @param markName The name of the mark.
+     */
+    function mark(markName: string): void;
+    /**
+     * Adds a performance measurement with the specified name.
+     *
+     * @param measureName The name of the performance measurement.
+     * @param startMarkName The name of the starting mark. If not supplied, the point at which the
+     *      profiler was enabled is used.
+     * @param endMarkName The name of the ending mark. If not supplied, the current timestamp is
+     *      used.
+     */
+    function measure(measureName: string, startMarkName?: string, endMarkName?: string): void;
+    /**
+     * Gets the number of times a marker was encountered.
+     *
+     * @param markName The name of the mark.
+     */
+    function getCount(markName: string): number;
+    /**
+     * Gets the total duration of all measurements with the supplied name.
+     *
+     * @param measureName The name of the measure whose durations should be accumulated.
+     */
+    function getDuration(measureName: string): number;
+    /**
+     * Iterate over each measure, performing some action
+     *
+     * @param cb The action to perform for each measure
+     */
+    function forEachMeasure(cb: (measureName: string, duration: number) => void): void;
+    /** Enables (and resets) performance measurements for the compiler. */
+    function enable(): void;
+    /** Disables performance measurements for the compiler. */
+    function disable(): void;
+}
+declare namespace ts {
+    const versionMajorMinor = "3.0";
+    /** The version of the TypeScript compiler release */
+    const version: string;
+}
+declare namespace ts {
+    /**
+     * Type of objects whose values are all of the same type.
+     * The `in` and `for-in` operators can *not* be safely used,
+     * since `Object.prototype` may be modified by outside code.
+     */
+    interface MapLike<T> {
+        [index: string]: T;
+    }
+    interface SortedArray<T> extends Array<T> {
+        " __sortedArrayBrand": any;
+    }
+}
+declare namespace ts {
+    type EqualityComparer<T> = (a: T, b: T) => boolean;
+    type Comparer<T> = (a: T, b: T) => Comparison;
+    enum Comparison {
+        LessThan = -1,
+        EqualTo = 0,
+        GreaterThan = 1
+    }
+    /** ES6 Map interface, only read methods included. */
+    interface ReadonlyMap<T> {
+        get(key: string): T | undefined;
+        has(key: string): boolean;
+        forEach(action: (value: T, key: string) => void): void;
+        readonly size: number;
+        keys(): Iterator<string>;
+        values(): Iterator<T>;
+        entries(): Iterator<[string, T]>;
+    }
+    /** ES6 Map interface. */
+    interface Map<T> extends ReadonlyMap<T> {
+        set(key: string, value: T): this;
+        delete(key: string): boolean;
+        clear(): void;
+    }
+    /** ES6 Iterator type. */
+    interface Iterator<T> {
+        next(): {
+            value: T;
+            done: false;
+        } | {
+            value: never;
+            done: true;
+        };
+    }
+    /** Array that is only intended to be pushed to, never read. */
+    interface Push<T> {
+        push(...values: T[]): void;
+    }
+    /** Create a new map. If a template object is provided, the map will copy entries from it. */
+    function createMap<T>(): Map<T>;
+    function createMapFromEntries<T>(entries: [string, T][]): Map<T>;
+    function createMapFromTemplate<T>(template: MapLike<T>): Map<T>;
+    const MapCtr: new <T>() => Map<T>;
+    function length(array: ReadonlyArray<any> | undefined): number;
+    /**
+     * Iterates through 'array' by index and performs the callback on each element of array until the callback
+     * returns a truthy value, then returns that value.
+     * If no such value is found, the callback is applied to each element of array and undefined is returned.
+     */
+    function forEach<T, U>(array: ReadonlyArray<T> | undefined, callback: (element: T, index: number) => U | undefined): U | undefined;
+    /** Like `forEach`, but suitable for use with numbers and strings (which may be falsy). */
+    function firstDefined<T, U>(array: ReadonlyArray<T> | undefined, callback: (element: T, index: number) => U | undefined): U | undefined;
+    function firstDefinedIterator<T, U>(iter: Iterator<T>, callback: (element: T) => U | undefined): U | undefined;
+    function zipWith<T, U, V>(arrayA: ReadonlyArray<T>, arrayB: ReadonlyArray<U>, callback: (a: T, b: U, index: number) => V): V[];
+    function zipToIterator<T, U>(arrayA: ReadonlyArray<T>, arrayB: ReadonlyArray<U>): Iterator<[T, U]>;
+    function zipToMap<T>(keys: ReadonlyArray<string>, values: ReadonlyArray<T>): Map<T>;
+    /**
+     * Iterates through `array` by index and performs the callback on each element of array until the callback
+     * returns a falsey value, then returns false.
+     * If no such value is found, the callback is applied to each element of array and `true` is returned.
+     */
+    function every<T>(array: ReadonlyArray<T>, callback: (element: T, index: number) => boolean): boolean;
+    /** Works like Array.prototype.find, returning `undefined` if no element satisfying the predicate is found. */
+    function find<T, U extends T>(array: ReadonlyArray<T>, predicate: (element: T, index: number) => element is U): U | undefined;
+    function find<T>(array: ReadonlyArray<T>, predicate: (element: T, index: number) => boolean): T | undefined;
+    function findLast<T, U extends T>(array: ReadonlyArray<T>, predicate: (element: T, index: number) => element is U): U | undefined;
+    function findLast<T>(array: ReadonlyArray<T>, predicate: (element: T, index: number) => boolean): T | undefined;
+    /** Works like Array.prototype.findIndex, returning `-1` if no element satisfying the predicate is found. */
+    function findIndex<T>(array: ReadonlyArray<T>, predicate: (element: T, index: number) => boolean, startIndex?: number): number;
+    function findLastIndex<T>(array: ReadonlyArray<T>, predicate: (element: T, index: number) => boolean, startIndex?: number): number;
+    /**
+     * Returns the first truthy result of `callback`, or else fails.
+     * This is like `forEach`, but never returns undefined.
+     */
+    function findMap<T, U>(array: ReadonlyArray<T>, callback: (element: T, index: number) => U | undefined): U;
+    function contains<T>(array: ReadonlyArray<T> | undefined, value: T, equalityComparer?: EqualityComparer<T>): boolean;
+    function arraysEqual<T>(a: ReadonlyArray<T>, b: ReadonlyArray<T>, equalityComparer?: EqualityComparer<T>): boolean;
+    function indexOfAnyCharCode(text: string, charCodes: ReadonlyArray<number>, start?: number): number;
+    function countWhere<T>(array: ReadonlyArray<T>, predicate: (x: T, i: number) => boolean): number;
+    /**
+     * Filters an array by a predicate function. Returns the same array instance if the predicate is
+     * true for all elements, otherwise returns a new array instance containing the filtered subset.
+     */
+    function filter<T, U extends T>(array: T[], f: (x: T) => x is U): U[];
+    function filter<T>(array: T[], f: (x: T) => boolean): T[];
+    function filter<T, U extends T>(array: ReadonlyArray<T>, f: (x: T) => x is U): ReadonlyArray<U>;
+    function filter<T, U extends T>(array: ReadonlyArray<T>, f: (x: T) => boolean): ReadonlyArray<T>;
+    function filter<T, U extends T>(array: T[] | undefined, f: (x: T) => x is U): U[] | undefined;
+    function filter<T>(array: T[] | undefined, f: (x: T) => boolean): T[] | undefined;
+    function filter<T, U extends T>(array: ReadonlyArray<T> | undefined, f: (x: T) => x is U): ReadonlyArray<U> | undefined;
+    function filter<T, U extends T>(array: ReadonlyArray<T> | undefined, f: (x: T) => boolean): ReadonlyArray<T> | undefined;
+    function filterMutate<T>(array: T[], f: (x: T, i: number, array: T[]) => boolean): void;
+    function clear(array: {}[]): void;
+    function map<T, U>(array: ReadonlyArray<T>, f: (x: T, i: number) => U): U[];
+    function map<T, U>(array: ReadonlyArray<T> | undefined, f: (x: T, i: number) => U): U[] | undefined;
+    function mapIterator<T, U>(iter: Iterator<T>, mapFn: (x: T) => U): Iterator<U>;
+    function sameMap<T>(array: T[], f: (x: T, i: number) => T): T[];
+    function sameMap<T>(array: ReadonlyArray<T>, f: (x: T, i: number) => T): ReadonlyArray<T>;
+    function sameMap<T>(array: T[] | undefined, f: (x: T, i: number) => T): T[] | undefined;
+    function sameMap<T>(array: ReadonlyArray<T> | undefined, f: (x: T, i: number) => T): ReadonlyArray<T> | undefined;
+    /**
+     * Flattens an array containing a mix of array or non-array elements.
+     *
+     * @param array The array to flatten.
+     */
+    function flatten<T>(array: ReadonlyArray<T | ReadonlyArray<T> | undefined>): T[];
+    function flatten<T>(array: ReadonlyArray<T | ReadonlyArray<T> | undefined> | undefined): T[] | undefined;
+    /**
+     * Maps an array. If the mapped value is an array, it is spread into the result.
+     *
+     * @param array The array to map.
+     * @param mapfn The callback used to map the result into one or more values.
+     */
+    function flatMap<T, U>(array: ReadonlyArray<T>, mapfn: (x: T, i: number) => U | ReadonlyArray<U> | undefined): U[];
+    function flatMap<T, U>(array: ReadonlyArray<T> | undefined, mapfn: (x: T, i: number) => U | ReadonlyArray<U> | undefined): U[] | undefined;
+    function flatMapIterator<T, U>(iter: Iterator<T>, mapfn: (x: T) => U[] | Iterator<U> | undefined): Iterator<U>;
+    /**
+     * Maps an array. If the mapped value is an array, it is spread into the result.
+     * Avoids allocation if all elements map to themselves.
+     *
+     * @param array The array to map.
+     * @param mapfn The callback used to map the result into one or more values.
+     */
+    function sameFlatMap<T>(array: T[], mapfn: (x: T, i: number) => T | ReadonlyArray<T>): T[];
+    function sameFlatMap<T>(array: ReadonlyArray<T>, mapfn: (x: T, i: number) => T | ReadonlyArray<T>): ReadonlyArray<T>;
+    function mapAllOrFail<T, U>(array: ReadonlyArray<T>, mapFn: (x: T, i: number) => U | undefined): U[] | undefined;
+    function mapDefined<T, U>(array: ReadonlyArray<T> | undefined, mapFn: (x: T, i: number) => U | undefined): U[];
+    function mapDefinedIterator<T, U>(iter: Iterator<T>, mapFn: (x: T) => U | undefined): Iterator<U>;
+    const emptyIterator: Iterator<never>;
+    function singleIterator<T>(value: T): Iterator<T>;
+    /**
+     * Maps contiguous spans of values with the same key.
+     *
+     * @param array The array to map.
+     * @param keyfn A callback used to select the key for an element.
+     * @param mapfn A callback used to map a contiguous chunk of values to a single value.
+     */
+    function spanMap<T, K, U>(array: ReadonlyArray<T>, keyfn: (x: T, i: number) => K, mapfn: (chunk: T[], key: K, start: number, end: number) => U): U[];
+    function spanMap<T, K, U>(array: ReadonlyArray<T> | undefined, keyfn: (x: T, i: number) => K, mapfn: (chunk: T[], key: K, start: number, end: number) => U): U[] | undefined;
+    function mapEntries<T, U>(map: ReadonlyMap<T>, f: (key: string, value: T) => [string, U]): Map<U>;
+    function mapEntries<T, U>(map: ReadonlyMap<T> | undefined, f: (key: string, value: T) => [string, U]): Map<U> | undefined;
+    function some<T>(array: ReadonlyArray<T> | undefined): array is ReadonlyArray<T>;
+    function some<T>(array: ReadonlyArray<T> | undefined, predicate: (value: T) => boolean): boolean;
+    /** Calls the callback with (start, afterEnd) index pairs for each range where 'pred' is true. */
+    function getRangesWhere<T>(arr: ReadonlyArray<T>, pred: (t: T) => boolean, cb: (start: number, afterEnd: number) => void): void;
+    function concatenate<T>(array1: T[], array2: T[]): T[];
+    function concatenate<T>(array1: ReadonlyArray<T>, array2: ReadonlyArray<T>): ReadonlyArray<T>;
+    function concatenate<T>(array1: T[] | undefined, array2: T[] | undefined): T[];
+    function concatenate<T>(array1: ReadonlyArray<T> | undefined, array2: ReadonlyArray<T> | undefined): ReadonlyArray<T>;
+    /**
+     * Deduplicates an unsorted array.
+     * @param equalityComparer An optional `EqualityComparer` used to determine if two values are duplicates.
+     * @param comparer An optional `Comparer` used to sort entries before comparison, though the
+     * result will remain in the original order in `array`.
+     */
+    function deduplicate<T>(array: ReadonlyArray<T>, equalityComparer?: EqualityComparer<T>, comparer?: Comparer<T>): T[];
+    function deduplicate<T>(array: ReadonlyArray<T> | undefined, equalityComparer?: EqualityComparer<T>, comparer?: Comparer<T>): T[] | undefined;
+    function insertSorted<T>(array: SortedArray<T>, insert: T, compare: Comparer<T>): void;
+    function sortAndDeduplicate<T>(array: ReadonlyArray<T>, comparer: Comparer<T>, equalityComparer?: EqualityComparer<T>): T[];
+    function arrayIsEqualTo<T>(array1: ReadonlyArray<T> | undefined, array2: ReadonlyArray<T> | undefined, equalityComparer?: (a: T, b: T) => boolean): boolean;
+    /**
+     * Compacts an array, removing any falsey elements.
+     */
+    function compact<T>(array: T[]): T[];
+    function compact<T>(array: ReadonlyArray<T>): ReadonlyArray<T>;
+    /**
+     * Gets the relative complement of `arrayA` with respect to `arrayB`, returning the elements that
+     * are not present in `arrayA` but are present in `arrayB`. Assumes both arrays are sorted
+     * based on the provided comparer.
+     */
+    function relativeComplement<T>(arrayA: T[] | undefined, arrayB: T[] | undefined, comparer: Comparer<T>): T[] | undefined;
+    function sum<T extends Record<K, number>, K extends string>(array: ReadonlyArray<T>, prop: K): number;
+    /**
+     * Appends a value to an array, returning the array.
+     *
+     * @param to The array to which `value` is to be appended. If `to` is `undefined`, a new array
+     * is created if `value` was appended.
+     * @param value The value to append to the array. If `value` is `undefined`, nothing is
+     * appended.
+     */
+    function append<T>(to: T[], value: T | undefined): T[];
+    function append<T>(to: T[] | undefined, value: T): T[];
+    function append<T>(to: T[] | undefined, value: T | undefined): T[] | undefined;
+    function append<T>(to: Push<T>, value: T | undefined): void;
+    /**
+     * Appends a range of value to an array, returning the array.
+     *
+     * @param to The array to which `value` is to be appended. If `to` is `undefined`, a new array
+     * is created if `value` was appended.
+     * @param from The values to append to the array. If `from` is `undefined`, nothing is
+     * appended. If an element of `from` is `undefined`, that element is not appended.
+     * @param start The offset in `from` at which to start copying values.
+     * @param end The offset in `from` at which to stop copying values (non-inclusive).
+     */
+    function addRange<T>(to: T[], from: ReadonlyArray<T> | undefined, start?: number, end?: number): T[];
+    function addRange<T>(to: T[] | undefined, from: ReadonlyArray<T> | undefined, start?: number, end?: number): T[] | undefined;
+    /**
+     * @return Whether the value was added.
+     */
+    function pushIfUnique<T>(array: T[], toAdd: T, equalityComparer?: EqualityComparer<T>): boolean;
+    /**
+     * Unlike `pushIfUnique`, this can take `undefined` as an input, and returns a new array.
+     */
+    function appendIfUnique<T>(array: T[] | undefined, toAdd: T, equalityComparer?: EqualityComparer<T>): T[];
+    /**
+     * Returns a new sorted array.
+     */
+    function sort<T>(array: ReadonlyArray<T>, comparer: Comparer<T>): T[];
+    function best<T>(iter: Iterator<T>, isBetter: (a: T, b: T) => boolean): T | undefined;
+    function arrayIterator<T>(array: ReadonlyArray<T>): Iterator<T>;
+    /**
+     * Stable sort of an array. Elements equal to each other maintain their relative position in the array.
+     */
+    function stableSort<T>(array: ReadonlyArray<T>, comparer: Comparer<T>): T[];
+    function rangeEquals<T>(array1: ReadonlyArray<T>, array2: ReadonlyArray<T>, pos: number, end: number): boolean;
+    /**
+     * Returns the element at a specific offset in an array if non-empty, `undefined` otherwise.
+     * A negative offset indicates the element should be retrieved from the end of the array.
+     */
+    function elementAt<T>(array: ReadonlyArray<T> | undefined, offset: number): T | undefined;
+    /**
+     * Returns the first element of an array if non-empty, `undefined` otherwise.
+     */
+    function firstOrUndefined<T>(array: ReadonlyArray<T>): T | undefined;
+    function first<T>(array: ReadonlyArray<T>): T;
+    /**
+     * Returns the last element of an array if non-empty, `undefined` otherwise.
+     */
+    function lastOrUndefined<T>(array: ReadonlyArray<T>): T | undefined;
+    function last<T>(array: ReadonlyArray<T>): T;
+    /**
+     * Returns the only element of an array if it contains only one element, `undefined` otherwise.
+     */
+    function singleOrUndefined<T>(array: ReadonlyArray<T> | undefined): T | undefined;
+    /**
+     * Returns the only element of an array if it contains only one element; otheriwse, returns the
+     * array.
+     */
+    function singleOrMany<T>(array: T[]): T | T[];
+    function singleOrMany<T>(array: ReadonlyArray<T>): T | ReadonlyArray<T>;
+    function singleOrMany<T>(array: T[] | undefined): T | T[] | undefined;
+    function singleOrMany<T>(array: ReadonlyArray<T> | undefined): T | ReadonlyArray<T> | undefined;
+    function replaceElement<T>(array: ReadonlyArray<T>, index: number, value: T): T[];
+    /**
+     * Performs a binary search, finding the index at which `value` occurs in `array`.
+     * If no such index is found, returns the 2's-complement of first index at which
+     * `array[index]` exceeds `value`.
+     * @param array A sorted array whose first element must be no larger than number
+     * @param value The value to be searched for in the array.
+     * @param keySelector A callback used to select the search key from `value` and each element of
+     * `array`.
+     * @param keyComparer A callback used to compare two keys in a sorted array.
+     * @param offset An offset into `array` at which to start the search.
+     */
+    function binarySearch<T, U>(array: ReadonlyArray<T>, value: T, keySelector: (v: T) => U, keyComparer: Comparer<U>, offset?: number): number;
+    function reduceLeft<T, U>(array: ReadonlyArray<T> | undefined, f: (memo: U, value: T, i: number) => U, initial: U, start?: number, count?: number): U;
+    function reduceLeft<T>(array: ReadonlyArray<T>, f: (memo: T, value: T, i: number) => T): T | undefined;
+    /**
+     * Indicates whether a map-like contains an own property with the specified key.
+     *
+     * @param map A map-like.
+     * @param key A property key.
+     */
+    function hasProperty(map: MapLike<any>, key: string): boolean;
+    /**
+     * Gets the value of an owned property in a map-like.
+     *
+     * @param map A map-like.
+     * @param key A property key.
+     */
+    function getProperty<T>(map: MapLike<T>, key: string): T | undefined;
+    /**
+     * Gets the owned, enumerable property keys of a map-like.
+     */
+    function getOwnKeys<T>(map: MapLike<T>): string[];
+    function getOwnValues<T>(sparseArray: T[]): T[];
+    /** Shims `Array.from`. */
+    function arrayFrom<T, U>(iterator: Iterator<T>, map: (t: T) => U): U[];
+    function arrayFrom<T>(iterator: Iterator<T>): T[];
+    function assign<T extends object>(t: T, ...args: (T | undefined)[]): T;
+    /**
+     * Performs a shallow equality comparison of the contents of two map-likes.
+     *
+     * @param left A map-like whose properties should be compared.
+     * @param right A map-like whose properties should be compared.
+     */
+    function equalOwnProperties<T>(left: MapLike<T> | undefined, right: MapLike<T> | undefined, equalityComparer?: EqualityComparer<T>): boolean;
+    /**
+     * Creates a map from the elements of an array.
+     *
+     * @param array the array of input elements.
+     * @param makeKey a function that produces a key for a given element.
+     *
+     * This function makes no effort to avoid collisions; if any two elements produce
+     * the same key with the given 'makeKey' function, then the element with the higher
+     * index in the array will be the one associated with the produced key.
+     */
+    function arrayToMap<T>(array: ReadonlyArray<T>, makeKey: (value: T) => string | undefined): Map<T>;
+    function arrayToMap<T, U>(array: ReadonlyArray<T>, makeKey: (value: T) => string | undefined, makeValue: (value: T) => U): Map<U>;
+    function arrayToNumericMap<T>(array: ReadonlyArray<T>, makeKey: (value: T) => number): T[];
+    function arrayToNumericMap<T, U>(array: ReadonlyArray<T>, makeKey: (value: T) => number, makeValue: (value: T) => U): U[];
+    function arrayToMultiMap<T>(values: ReadonlyArray<T>, makeKey: (value: T) => string): MultiMap<T>;
+    function arrayToMultiMap<T, U>(values: ReadonlyArray<T>, makeKey: (value: T) => string, makeValue: (value: T) => U): MultiMap<U>;
+    function group<T>(values: ReadonlyArray<T>, getGroupId: (value: T) => string): ReadonlyArray<ReadonlyArray<T>>;
+    function clone<T>(object: T): T;
+    function extend<T1, T2>(first: T1, second: T2): T1 & T2;
+    interface MultiMap<T> extends Map<T[]> {
+        /**
+         * Adds the value to an array of values associated with the key, and returns the array.
+         * Creates the array if it does not already exist.
+         */
+        add(key: string, value: T): T[];
+        /**
+         * Removes a value from an array of values associated with the key.
+         * Does not preserve the order of those values.
+         * Does nothing if `key` is not in `map`, or `value` is not in `map[key]`.
+         */
+        remove(key: string, value: T): void;
+    }
+    function createMultiMap<T>(): MultiMap<T>;
+    /**
+     * Tests whether a value is an array.
+     */
+    function isArray(value: any): value is ReadonlyArray<{}>;
+    function toArray<T>(value: T | T[]): T[];
+    function toArray<T>(value: T | ReadonlyArray<T>): ReadonlyArray<T>;
+    /**
+     * Tests whether a value is string
+     */
+    function isString(text: any): text is string;
+    function tryCast<TOut extends TIn, TIn = any>(value: TIn | undefined, test: (value: TIn) => value is TOut): TOut | undefined;
+    function cast<TOut extends TIn, TIn = any>(value: TIn | undefined, test: (value: TIn) => value is TOut): TOut;
+    /** Does nothing. */
+    function noop(_?: {} | null | undefined): void;
+    /** Do nothing and return false */
+    function returnFalse(): false;
+    /** Do nothing and return true */
+    function returnTrue(): true;
+    /** Returns its argument. */
+    function identity<T>(x: T): T;
+    /** Returns lower case string */
+    function toLowerCase(x: string): string;
+    /** Throws an error because a function is not implemented. */
+    function notImplemented(): never;
+    function memoize<T>(callback: () => T): () => T;
+    /**
+     * High-order function, creates a function that executes a function composition.
+     * For example, `chain(a, b)` is the equivalent of `x => ((a', b') => y => b'(a'(y)))(a(x), b(x))`
+     *
+     * @param args The functions to chain.
+     */
+    function chain<T, U>(...args: ((t: T) => (u: U) => U)[]): (t: T) => (u: U) => U;
+    /**
+     * High-order function, composes functions. Note that functions are composed inside-out;
+     * for example, `compose(a, b)` is the equivalent of `x => b(a(x))`.
+     *
+     * @param args The functions to compose.
+     */
+    function compose<T>(...args: ((t: T) => T)[]): (t: T) => T;
+    enum AssertionLevel {
+        None = 0,
+        Normal = 1,
+        Aggressive = 2,
+        VeryAggressive = 3
+    }
+    /**
+     * Safer version of `Function` which should not be called.
+     * Every function should be assignable to this, but this should not be assignable to every function.
+     */
+    type AnyFunction = (...args: never[]) => void;
+    namespace Debug {
+        let currentAssertionLevel: AssertionLevel;
+        let isDebugging: boolean;
+        function shouldAssert(level: AssertionLevel): boolean;
+        function assert(expression: boolean, message?: string, verboseDebugInfo?: string | (() => string), stackCrawlMark?: AnyFunction): void;
+        function assertEqual<T>(a: T, b: T, msg?: string, msg2?: string): void;
+        function assertLessThan(a: number, b: number, msg?: string): void;
+        function assertLessThanOrEqual(a: number, b: number): void;
+        function assertGreaterThanOrEqual(a: number, b: number): void;
+        function fail(message?: string, stackCrawlMark?: AnyFunction): never;
+        function assertDefined<T>(value: T | null | undefined, message?: string): T;
+        function assertEachDefined<T, A extends ReadonlyArray<T>>(value: A, message?: string): A;
+        function assertNever(member: never, message?: string, stackCrawlMark?: AnyFunction): never;
+        function getFunctionName(func: AnyFunction): any;
+    }
+    function equateValues<T>(a: T, b: T): boolean;
+    /**
+     * Compare the equality of two strings using a case-sensitive ordinal comparison.
+     *
+     * Case-sensitive comparisons compare both strings one code-point at a time using the integer
+     * value of each code-point after applying `toUpperCase` to each string. We always map both
+     * strings to their upper-case form as some unicode characters do not properly round-trip to
+     * lowercase (such as `ẞ` (German sharp capital s)).
+     */
+    function equateStringsCaseInsensitive(a: string, b: string): boolean;
+    /**
+     * Compare the equality of two strings using a case-sensitive ordinal comparison.
+     *
+     * Case-sensitive comparisons compare both strings one code-point at a time using the
+     * integer value of each code-point.
+     */
+    function equateStringsCaseSensitive(a: string, b: string): boolean;
+    /**
+     * Compare two numeric values for their order relative to each other.
+     * To compare strings, use any of the `compareStrings` functions.
+     */
+    function compareValues(a: number | undefined, b: number | undefined): Comparison;
+    function min<T>(a: T, b: T, compare: Comparer<T>): T;
+    /**
+     * Compare two strings using a case-insensitive ordinal comparison.
+     *
+     * Ordinal comparisons are based on the difference between the unicode code points of both
+     * strings. Characters with multiple unicode representations are considered unequal. Ordinal
+     * comparisons provide predictable ordering, but place "a" after "B".
+     *
+     * Case-insensitive comparisons compare both strings one code-point at a time using the integer
+     * value of each code-point after applying `toUpperCase` to each string. We always map both
+     * strings to their upper-case form as some unicode characters do not properly round-trip to
+     * lowercase (such as `ẞ` (German sharp capital s)).
+     */
+    function compareStringsCaseInsensitive(a: string, b: string): Comparison;
+    /**
+     * Compare two strings using a case-sensitive ordinal comparison.
+     *
+     * Ordinal comparisons are based on the difference between the unicode code points of both
+     * strings. Characters with multiple unicode representations are considered unequal. Ordinal
+     * comparisons provide predictable ordering, but place "a" after "B".
+     *
+     * Case-sensitive comparisons compare both strings one code-point at a time using the integer
+     * value of each code-point.
+     */
+    function compareStringsCaseSensitive(a: string | undefined, b: string | undefined): Comparison;
+    function getStringComparer(ignoreCase?: boolean): typeof compareStringsCaseInsensitive;
+    function getUILocale(): string | undefined;
+    function setUILocale(value: string | undefined): void;
+    /**
+     * Compare two strings in a using the case-sensitive sort behavior of the UI locale.
+     *
+     * Ordering is not predictable between different host locales, but is best for displaying
+     * ordered data for UI presentation. Characters with multiple unicode representations may
+     * be considered equal.
+     *
+     * Case-sensitive comparisons compare strings that differ in base characters, or
+     * accents/diacritic marks, or case as unequal.
+     */
+    function compareStringsCaseSensitiveUI(a: string, b: string): Comparison;
+    function compareProperties<T, K extends keyof T>(a: T | undefined, b: T | undefined, key: K, comparer: Comparer<T[K]>): Comparison;
+    /** True is greater than false. */
+    function compareBooleans(a: boolean, b: boolean): Comparison;
+    /**
+     * Given a name and a list of names that are *not* equal to the name, return a spelling suggestion if there is one that is close enough.
+     * Names less than length 3 only check for case-insensitive equality, not Levenshtein distance.
+     *
+     * If there is a candidate that's the same except for case, return that.
+     * If there is a candidate that's within one edit of the name, return that.
+     * Otherwise, return the candidate with the smallest Levenshtein distance,
+     *    except for candidates:
+     *      * With no name
+     *      * Whose length differs from the target name by more than 0.34 of the length of the name.
+     *      * Whose levenshtein distance is more than 0.4 of the length of the name
+     *        (0.4 allows 1 substitution/transposition for every 5 characters,
+     *         and 1 insertion/deletion at 3 characters)
+     */
+    function getSpellingSuggestion<T>(name: string, candidates: T[], getName: (candidate: T) => string | undefined): T | undefined;
+    function endsWith(str: string, suffix: string): boolean;
+    function removeSuffix(str: string, suffix: string): string;
+    function tryRemoveSuffix(str: string, suffix: string): string | undefined;
+    function stringContains(str: string, substring: string): boolean;
+    function fileExtensionIs(path: string, extension: string): boolean;
+    function fileExtensionIsOneOf(path: string, extensions: ReadonlyArray<string>): boolean;
+    /**
+     * Takes a string like "jquery-min.4.2.3" and returns "jquery"
+     */
+    function removeMinAndVersionNumbers(fileName: string): string;
+    /** Remove an item from an array, moving everything to its right one space left. */
+    function orderedRemoveItem<T>(array: T[], item: T): boolean;
+    /** Remove an item by index from an array, moving everything to its right one space left. */
+    function orderedRemoveItemAt<T>(array: T[], index: number): void;
+    function unorderedRemoveItemAt<T>(array: T[], index: number): void;
+    /** Remove the *first* occurrence of `item` from the array. */
+    function unorderedRemoveItem<T>(array: T[], item: T): boolean;
+    type GetCanonicalFileName = (fileName: string) => string;
+    function createGetCanonicalFileName(useCaseSensitiveFileNames: boolean): GetCanonicalFileName;
+    /** Represents a "prefix*suffix" pattern. */
+    interface Pattern {
+        prefix: string;
+        suffix: string;
+    }
+    function patternText({ prefix, suffix }: Pattern): string;
+    /**
+     * Given that candidate matches pattern, returns the text matching the '*'.
+     * E.g.: matchedText(tryParsePattern("foo*baz"), "foobarbaz") === "bar"
+     */
+    function matchedText(pattern: Pattern, candidate: string): string;
+    /** Return the object corresponding to the best pattern to match `candidate`. */
+    function findBestPatternMatch<T>(values: ReadonlyArray<T>, getPattern: (value: T) => Pattern, candidate: string): T | undefined;
+    function startsWith(str: string, prefix: string): boolean;
+    function removePrefix(str: string, prefix: string): string;
+    function tryRemovePrefix(str: string, prefix: string): string | undefined;
+    function and<T>(f: (arg: T) => boolean, g: (arg: T) => boolean): (arg: T) => boolean;
+    function or<T>(f: (arg: T) => boolean, g: (arg: T) => boolean): (arg: T) => boolean;
+    function assertTypeIsNever(_: never): void;
+    function singleElementArray<T>(t: T | undefined): T[] | undefined;
+    function enumerateInsertsAndDeletes<T, U>(newItems: ReadonlyArray<T>, oldItems: ReadonlyArray<U>, comparer: (a: T, b: U) => Comparison, inserted: (newItem: T) => void, deleted: (oldItem: U) => void, unchanged?: (oldItem: U, newItem: T) => void): void;
+}
+//# sourceMappingURL=core.d.ts.map
+declare namespace ts {
+    type Path = string & {
+        __pathBrand: any;
+    };
+    interface TextRange {
+        pos: number;
+        end: number;
+    }
+    type JsDocSyntaxKind = SyntaxKind.EndOfFileToken | SyntaxKind.WhitespaceTrivia | SyntaxKind.AtToken | SyntaxKind.NewLineTrivia | SyntaxKind.AsteriskToken | SyntaxKind.OpenBraceToken | SyntaxKind.CloseBraceToken | SyntaxKind.LessThanToken | SyntaxKind.OpenBracketToken | SyntaxKind.CloseBracketToken | SyntaxKind.EqualsToken | SyntaxKind.CommaToken | SyntaxKind.DotToken | SyntaxKind.Identifier | SyntaxKind.NoSubstitutionTemplateLiteral | SyntaxKind.Unknown;
+    type JsxTokenSyntaxKind = SyntaxKind.LessThanSlashToken | SyntaxKind.EndOfFileToken | SyntaxKind.ConflictMarkerTrivia | SyntaxKind.JsxText | SyntaxKind.JsxTextAllWhiteSpaces | SyntaxKind.OpenBraceToken | SyntaxKind.LessThanToken;
+    enum SyntaxKind {
+        Unknown = 0,
+        EndOfFileToken = 1,
+        SingleLineCommentTrivia = 2,
+        MultiLineCommentTrivia = 3,
+        NewLineTrivia = 4,
+        WhitespaceTrivia = 5,
+        ShebangTrivia = 6,
+        ConflictMarkerTrivia = 7,
+        NumericLiteral = 8,
+        StringLiteral = 9,
+        JsxText = 10,
+        JsxTextAllWhiteSpaces = 11,
+        RegularExpressionLiteral = 12,
+        NoSubstitutionTemplateLiteral = 13,
+        TemplateHead = 14,
+        TemplateMiddle = 15,
+        TemplateTail = 16,
+        OpenBraceToken = 17,
+        CloseBraceToken = 18,
+        OpenParenToken = 19,
+        CloseParenToken = 20,
+        OpenBracketToken = 21,
+        CloseBracketToken = 22,
+        DotToken = 23,
+        DotDotDotToken = 24,
+        SemicolonToken = 25,
+        CommaToken = 26,
+        LessThanToken = 27,
+        LessThanSlashToken = 28,
+        GreaterThanToken = 29,
+        LessThanEqualsToken = 30,
+        GreaterThanEqualsToken = 31,
+        EqualsEqualsToken = 32,
+        ExclamationEqualsToken = 33,
+        EqualsEqualsEqualsToken = 34,
+        ExclamationEqualsEqualsToken = 35,
+        EqualsGreaterThanToken = 36,
+        PlusToken = 37,
+        MinusToken = 38,
+        AsteriskToken = 39,
+        AsteriskAsteriskToken = 40,
+        SlashToken = 41,
+        PercentToken = 42,
+        PlusPlusToken = 43,
+        MinusMinusToken = 44,
+        LessThanLessThanToken = 45,
+        GreaterThanGreaterThanToken = 46,
+        GreaterThanGreaterThanGreaterThanToken = 47,
+        AmpersandToken = 48,
+        BarToken = 49,
+        CaretToken = 50,
+        ExclamationToken = 51,
+        TildeToken = 52,
+        AmpersandAmpersandToken = 53,
+        BarBarToken = 54,
+        QuestionToken = 55,
+        ColonToken = 56,
+        AtToken = 57,
+        EqualsToken = 58,
+        PlusEqualsToken = 59,
+        MinusEqualsToken = 60,
+        AsteriskEqualsToken = 61,
+        AsteriskAsteriskEqualsToken = 62,
+        SlashEqualsToken = 63,
+        PercentEqualsToken = 64,
+        LessThanLessThanEqualsToken = 65,
+        GreaterThanGreaterThanEqualsToken = 66,
+        GreaterThanGreaterThanGreaterThanEqualsToken = 67,
+        AmpersandEqualsToken = 68,
+        BarEqualsToken = 69,
+        CaretEqualsToken = 70,
+        Identifier = 71,
+        BreakKeyword = 72,
+        CaseKeyword = 73,
+        CatchKeyword = 74,
+        ClassKeyword = 75,
+        ConstKeyword = 76,
+        ContinueKeyword = 77,
+        DebuggerKeyword = 78,
+        DefaultKeyword = 79,
+        DeleteKeyword = 80,
+        DoKeyword = 81,
+        ElseKeyword = 82,
+        EnumKeyword = 83,
+        ExportKeyword = 84,
+        ExtendsKeyword = 85,
+        FalseKeyword = 86,
+        FinallyKeyword = 87,
+        ForKeyword = 88,
+        FunctionKeyword = 89,
+        IfKeyword = 90,
+        ImportKeyword = 91,
+        InKeyword = 92,
+        InstanceOfKeyword = 93,
+        NewKeyword = 94,
+        NullKeyword = 95,
+        ReturnKeyword = 96,
+        SuperKeyword = 97,
+        SwitchKeyword = 98,
+        ThisKeyword = 99,
+        ThrowKeyword = 100,
+        TrueKeyword = 101,
+        TryKeyword = 102,
+        TypeOfKeyword = 103,
+        VarKeyword = 104,
+        VoidKeyword = 105,
+        WhileKeyword = 106,
+        WithKeyword = 107,
+        ImplementsKeyword = 108,
+        InterfaceKeyword = 109,
+        LetKeyword = 110,
+        PackageKeyword = 111,
+        PrivateKeyword = 112,
+        ProtectedKeyword = 113,
+        PublicKeyword = 114,
+        StaticKeyword = 115,
+        YieldKeyword = 116,
+        AbstractKeyword = 117,
+        AsKeyword = 118,
+        AnyKeyword = 119,
+        AsyncKeyword = 120,
+        AwaitKeyword = 121,
+        BooleanKeyword = 122,
+        ConstructorKeyword = 123,
+        DeclareKeyword = 124,
+        GetKeyword = 125,
+        InferKeyword = 126,
+        IsKeyword = 127,
+        KeyOfKeyword = 128,
+        ModuleKeyword = 129,
+        NamespaceKeyword = 130,
+        NeverKeyword = 131,
+        ReadonlyKeyword = 132,
+        RequireKeyword = 133,
+        NumberKeyword = 134,
+        ObjectKeyword = 135,
+        SetKeyword = 136,
+        StringKeyword = 137,
+        SymbolKeyword = 138,
+        TypeKeyword = 139,
+        UndefinedKeyword = 140,
+        UniqueKeyword = 141,
+        UnknownKeyword = 142,
+        FromKeyword = 143,
+        GlobalKeyword = 144,
+        OfKeyword = 145,
+        QualifiedName = 146,
+        ComputedPropertyName = 147,
+        TypeParameter = 148,
+        Parameter = 149,
+        Decorator = 150,
+        PropertySignature = 151,
+        PropertyDeclaration = 152,
+        MethodSignature = 153,
+        MethodDeclaration = 154,
+        Constructor = 155,
+        GetAccessor = 156,
+        SetAccessor = 157,
+        CallSignature = 158,
+        ConstructSignature = 159,
+        IndexSignature = 160,
+        TypePredicate = 161,
+        TypeReference = 162,
+        FunctionType = 163,
+        ConstructorType = 164,
+        TypeQuery = 165,
+        TypeLiteral = 166,
+        ArrayType = 167,
+        TupleType = 168,
+        UnionType = 169,
+        IntersectionType = 170,
+        ConditionalType = 171,
+        InferType = 172,
+        ParenthesizedType = 173,
+        ThisType = 174,
+        TypeOperator = 175,
+        IndexedAccessType = 176,
+        MappedType = 177,
+        LiteralType = 178,
+        ImportType = 179,
+        ObjectBindingPattern = 180,
+        ArrayBindingPattern = 181,
+        BindingElement = 182,
+        ArrayLiteralExpression = 183,
+        ObjectLiteralExpression = 184,
+        PropertyAccessExpression = 185,
+        ElementAccessExpression = 186,
+        CallExpression = 187,
+        NewExpression = 188,
+        TaggedTemplateExpression = 189,
+        TypeAssertionExpression = 190,
+        ParenthesizedExpression = 191,
+        FunctionExpression = 192,
+        ArrowFunction = 193,
+        DeleteExpression = 194,
+        TypeOfExpression = 195,
+        VoidExpression = 196,
+        AwaitExpression = 197,
+        PrefixUnaryExpression = 198,
+        PostfixUnaryExpression = 199,
+        BinaryExpression = 200,
+        ConditionalExpression = 201,
+        TemplateExpression = 202,
+        YieldExpression = 203,
+        SpreadElement = 204,
+        ClassExpression = 205,
+        OmittedExpression = 206,
+        ExpressionWithTypeArguments = 207,
+        AsExpression = 208,
+        NonNullExpression = 209,
+        MetaProperty = 210,
+        TemplateSpan = 211,
+        SemicolonClassElement = 212,
+        Block = 213,
+        VariableStatement = 214,
+        EmptyStatement = 215,
+        ExpressionStatement = 216,
+        IfStatement = 217,
+        DoStatement = 218,
+        WhileStatement = 219,
+        ForStatement = 220,
+        ForInStatement = 221,
+        ForOfStatement = 222,
+        ContinueStatement = 223,
+        BreakStatement = 224,
+        ReturnStatement = 225,
+        WithStatement = 226,
+        SwitchStatement = 227,
+        LabeledStatement = 228,
+        ThrowStatement = 229,
+        TryStatement = 230,
+        DebuggerStatement = 231,
+        VariableDeclaration = 232,
+        VariableDeclarationList = 233,
+        FunctionDeclaration = 234,
+        ClassDeclaration = 235,
+        InterfaceDeclaration = 236,
+        TypeAliasDeclaration = 237,
+        EnumDeclaration = 238,
+        ModuleDeclaration = 239,
+        ModuleBlock = 240,
+        CaseBlock = 241,
+        NamespaceExportDeclaration = 242,
+        ImportEqualsDeclaration = 243,
+        ImportDeclaration = 244,
+        ImportClause = 245,
+        NamespaceImport = 246,
+        NamedImports = 247,
+        ImportSpecifier = 248,
+        ExportAssignment = 249,
+        ExportDeclaration = 250,
+        NamedExports = 251,
+        ExportSpecifier = 252,
+        MissingDeclaration = 253,
+        ExternalModuleReference = 254,
+        JsxElement = 255,
+        JsxSelfClosingElement = 256,
+        JsxOpeningElement = 257,
+        JsxClosingElement = 258,
+        JsxFragment = 259,
+        JsxOpeningFragment = 260,
+        JsxClosingFragment = 261,
+        JsxAttribute = 262,
+        JsxAttributes = 263,
+        JsxSpreadAttribute = 264,
+        JsxExpression = 265,
+        CaseClause = 266,
+        DefaultClause = 267,
+        HeritageClause = 268,
+        CatchClause = 269,
+        PropertyAssignment = 270,
+        ShorthandPropertyAssignment = 271,
+        SpreadAssignment = 272,
+        EnumMember = 273,
+        SourceFile = 274,
+        Bundle = 275,
+        UnparsedSource = 276,
+        InputFiles = 277,
+        JSDocTypeExpression = 278,
+        JSDocAllType = 279,
+        JSDocUnknownType = 280,
+        JSDocNullableType = 281,
+        JSDocNonNullableType = 282,
+        JSDocOptionalType = 283,
+        JSDocFunctionType = 284,
+        JSDocVariadicType = 285,
+        JSDocComment = 286,
+        JSDocTypeLiteral = 287,
+        JSDocSignature = 288,
+        JSDocTag = 289,
+        JSDocAugmentsTag = 290,
+        JSDocClassTag = 291,
+        JSDocCallbackTag = 292,
+        JSDocParameterTag = 293,
+        JSDocReturnTag = 294,
+        JSDocTypeTag = 295,
+        JSDocTemplateTag = 296,
+        JSDocTypedefTag = 297,
+        JSDocPropertyTag = 298,
+        SyntaxList = 299,
+        NotEmittedStatement = 300,
+        PartiallyEmittedExpression = 301,
+        CommaListExpression = 302,
+        MergeDeclarationMarker = 303,
+        EndOfDeclarationMarker = 304,
+        Count = 305,
+        FirstAssignment = 58,
+        LastAssignment = 70,
+        FirstCompoundAssignment = 59,
+        LastCompoundAssignment = 70,
+        FirstReservedWord = 72,
+        LastReservedWord = 107,
+        FirstKeyword = 72,
+        LastKeyword = 145,
+        FirstFutureReservedWord = 108,
+        LastFutureReservedWord = 116,
+        FirstTypeNode = 161,
+        LastTypeNode = 179,
+        FirstPunctuation = 17,
+        LastPunctuation = 70,
+        FirstToken = 0,
+        LastToken = 145,
+        FirstTriviaToken = 2,
+        LastTriviaToken = 7,
+        FirstLiteralToken = 8,
+        LastLiteralToken = 13,
+        FirstTemplateToken = 13,
+        LastTemplateToken = 16,
+        FirstBinaryOperator = 27,
+        LastBinaryOperator = 70,
+        FirstNode = 146,
+        FirstJSDocNode = 278,
+        LastJSDocNode = 298,
+        FirstJSDocTagNode = 289,
+        LastJSDocTagNode = 298,
+        FirstContextualKeyword = 117,
+        LastContextualKeyword = 145
+    }
+    enum NodeFlags {
+        None = 0,
+        Let = 1,
+        Const = 2,
+        NestedNamespace = 4,
+        Synthesized = 8,
+        Namespace = 16,
+        ExportContext = 32,
+        ContainsThis = 64,
+        HasImplicitReturn = 128,
+        HasExplicitReturn = 256,
+        GlobalAugmentation = 512,
+        HasAsyncFunctions = 1024,
+        DisallowInContext = 2048,
+        YieldContext = 4096,
+        DecoratorContext = 8192,
+        AwaitContext = 16384,
+        ThisNodeHasError = 32768,
+        JavaScriptFile = 65536,
+        ThisNodeOrAnySubNodesHasError = 131072,
+        HasAggregatedChildData = 262144,
+        PossiblyContainsDynamicImport = 524288,
+        PossiblyContainsImportMeta = 1048576,
+        JSDoc = 2097152,
+        Ambient = 4194304,
+        InWithStatement = 8388608,
+        JsonFile = 16777216,
+        BlockScoped = 3,
+        ReachabilityCheckFlags = 384,
+        ReachabilityAndEmitFlags = 1408,
+        ContextFlags = 12679168,
+        TypeExcludesFlags = 20480,
+        PermanentlySetIncrementalFlags = 1572864
+    }
+    enum ModifierFlags {
+        None = 0,
+        Export = 1,
+        Ambient = 2,
+        Public = 4,
+        Private = 8,
+        Protected = 16,
+        Static = 32,
+        Readonly = 64,
+        Abstract = 128,
+        Async = 256,
+        Default = 512,
+        Const = 2048,
+        HasComputedFlags = 536870912,
+        AccessibilityModifier = 28,
+        ParameterPropertyModifier = 92,
+        NonPublicAccessibilityModifier = 24,
+        TypeScriptModifier = 2270,
+        ExportDefault = 513,
+        All = 3071
+    }
+    enum JsxFlags {
+        None = 0,
+        /** An element from a named property of the JSX.IntrinsicElements interface */
+        IntrinsicNamedElement = 1,
+        /** An element inferred from the string index signature of the JSX.IntrinsicElements interface */
+        IntrinsicIndexedElement = 2,
+        IntrinsicElement = 3
+    }
+    enum RelationComparisonResult {
+        Succeeded = 1,
+        Failed = 2,
+        FailedAndReported = 3
+    }
+    interface Node extends TextRange {
+        kind: SyntaxKind;
+        flags: NodeFlags;
+        modifierFlagsCache?: ModifierFlags;
+        transformFlags: TransformFlags;
+        decorators?: NodeArray<Decorator>;
+        modifiers?: ModifiersArray;
+        id?: number;
+        parent: Node;
+        original?: Node;
+        symbol: Symbol;
+        locals?: SymbolTable;
+        nextContainer?: Node;
+        localSymbol?: Symbol;
+        flowNode?: FlowNode;
+        emitNode?: EmitNode;
+        contextualType?: Type;
+        contextualMapper?: TypeMapper;
+    }
+    interface JSDocContainer {
+        jsDoc?: JSDoc[];
+        jsDocCache?: ReadonlyArray<JSDocTag>;
+    }
+    type HasJSDoc = ParameterDeclaration | CallSignatureDeclaration | ConstructSignatureDeclaration | MethodSignature | PropertySignature | ArrowFunction | ParenthesizedExpression | SpreadAssignment | ShorthandPropertyAssignment | PropertyAssignment | FunctionExpression | LabeledStatement | ExpressionStatement | VariableStatement | FunctionDeclaration | ConstructorDeclaration | MethodDeclaration | PropertyDeclaration | AccessorDeclaration | ClassLikeDeclaration | InterfaceDeclaration | TypeAliasDeclaration | EnumMember | EnumDeclaration | ModuleDeclaration | ImportEqualsDeclaration | IndexSignatureDeclaration | FunctionTypeNode | ConstructorTypeNode | JSDocFunctionType | EndOfFileToken;
+    type HasType = SignatureDeclaration | VariableDeclaration | ParameterDeclaration | PropertySignature | PropertyDeclaration | TypePredicateNode | ParenthesizedTypeNode | TypeOperatorNode | MappedTypeNode | AssertionExpression | TypeAliasDeclaration | JSDocTypeExpression | JSDocNonNullableType | JSDocNullableType | JSDocOptionalType | JSDocVariadicType;
+    type HasInitializer = HasExpressionInitializer | ForStatement | ForInStatement | ForOfStatement | JsxAttribute;
+    type HasExpressionInitializer = VariableDeclaration | ParameterDeclaration | BindingElement | PropertySignature | PropertyDeclaration | PropertyAssignment | EnumMember;
+    type MutableNodeArray<T extends Node> = NodeArray<T> & T[];
+    interface NodeArray<T extends Node> extends ReadonlyArray<T>, TextRange {
+        hasTrailingComma?: boolean;
+        transformFlags: TransformFlags;
+    }
+    interface Token<TKind extends SyntaxKind> extends Node {
+        kind: TKind;
+    }
+    type DotDotDotToken = Token<SyntaxKind.DotDotDotToken>;
+    type QuestionToken = Token<SyntaxKind.QuestionToken>;
+    type ExclamationToken = Token<SyntaxKind.ExclamationToken>;
+    type ColonToken = Token<SyntaxKind.ColonToken>;
+    type EqualsToken = Token<SyntaxKind.EqualsToken>;
+    type AsteriskToken = Token<SyntaxKind.AsteriskToken>;
+    type EqualsGreaterThanToken = Token<SyntaxKind.EqualsGreaterThanToken>;
+    type EndOfFileToken = Token<SyntaxKind.EndOfFileToken> & JSDocContainer;
+    type AtToken = Token<SyntaxKind.AtToken>;
+    type ReadonlyToken = Token<SyntaxKind.ReadonlyKeyword>;
+    type AwaitKeywordToken = Token<SyntaxKind.AwaitKeyword>;
+    type PlusToken = Token<SyntaxKind.PlusToken>;
+    type MinusToken = Token<SyntaxKind.MinusToken>;
+    type Modifier = Token<SyntaxKind.AbstractKeyword> | Token<SyntaxKind.AsyncKeyword> | Token<SyntaxKind.ConstKeyword> | Token<SyntaxKind.DeclareKeyword> | Token<SyntaxKind.DefaultKeyword> | Token<SyntaxKind.ExportKeyword> | Token<SyntaxKind.PublicKeyword> | Token<SyntaxKind.PrivateKeyword> | Token<SyntaxKind.ProtectedKeyword> | Token<SyntaxKind.ReadonlyKeyword> | Token<SyntaxKind.StaticKeyword>;
+    type ModifiersArray = NodeArray<Modifier>;
+    enum GeneratedIdentifierFlags {
+        None = 0,
+        Auto = 1,
+        Loop = 2,
+        Unique = 3,
+        Node = 4,
+        KindMask = 7,
+        ReservedInNestedScopes = 8,
+        Optimistic = 16,
+        FileLevel = 32
+    }
+    interface Identifier extends PrimaryExpression, Declaration {
+        kind: SyntaxKind.Identifier;
+        /**
+         * Prefer to use `id.unescapedText`. (Note: This is available only in services, not internally to the TypeScript compiler.)
+         * Text of identifier, but if the identifier begins with two underscores, this will begin with three.
+         */
+        escapedText: __String;
+        originalKeywordKind?: SyntaxKind;
+        autoGenerateFlags?: GeneratedIdentifierFlags;
+        autoGenerateId?: number;
+        isInJSDocNamespace?: boolean;
+        typeArguments?: NodeArray<TypeNode | TypeParameterDeclaration>;
+        jsdocDotPos?: number;
+    }
+    interface TransientIdentifier extends Identifier {
+        resolvedSymbol: Symbol;
+    }
+    interface GeneratedIdentifier extends Identifier {
+        autoGenerateFlags: GeneratedIdentifierFlags;
+    }
+    interface QualifiedName extends Node {
+        kind: SyntaxKind.QualifiedName;
+        left: EntityName;
+        right: Identifier;
+        jsdocDotPos?: number;
+    }
+    type EntityName = Identifier | QualifiedName;
+    type PropertyName = Identifier | StringLiteral | NumericLiteral | ComputedPropertyName;
+    type DeclarationName = Identifier | StringLiteral | NumericLiteral | ComputedPropertyName | BindingPattern;
+    interface Declaration extends Node {
+        _declarationBrand: any;
+    }
+    interface NamedDeclaration extends Declaration {
+        name?: DeclarationName;
+    }
+    interface DynamicNamedDeclaration extends NamedDeclaration {
+        name: ComputedPropertyName;
+    }
+    interface LateBoundDeclaration extends DynamicNamedDeclaration {
+        name: LateBoundName;
+    }
+    interface DeclarationStatement extends NamedDeclaration, Statement {
+        name?: Identifier | StringLiteral | NumericLiteral;
+    }
+    interface ComputedPropertyName extends Node {
+        kind: SyntaxKind.ComputedPropertyName;
+        expression: Expression;
+    }
+    interface LateBoundName extends ComputedPropertyName {
+        expression: EntityNameExpression;
+    }
+    interface Decorator extends Node {
+        kind: SyntaxKind.Decorator;
+        parent: NamedDeclaration;
+        expression: LeftHandSideExpression;
+    }
+    interface TypeParameterDeclaration extends NamedDeclaration {
+        kind: SyntaxKind.TypeParameter;
+        parent: DeclarationWithTypeParameters | InferTypeNode;
+        name: Identifier;
+        constraint?: TypeNode;
+        default?: TypeNode;
+        expression?: Expression;
+    }
+    interface SignatureDeclarationBase extends NamedDeclaration, JSDocContainer {
+        kind: SignatureDeclaration["kind"];
+        name?: PropertyName;
+        typeParameters?: NodeArray<TypeParameterDeclaration>;
+        parameters: NodeArray<ParameterDeclaration>;
+        type?: TypeNode;
+        typeArguments?: NodeArray<TypeNode>;
+    }
+    type SignatureDeclaration = CallSignatureDeclaration | ConstructSignatureDeclaration | MethodSignature | IndexSignatureDeclaration | FunctionTypeNode | ConstructorTypeNode | JSDocFunctionType | FunctionDeclaration | MethodDeclaration | ConstructorDeclaration | AccessorDeclaration | FunctionExpression | ArrowFunction;
+    interface CallSignatureDeclaration extends SignatureDeclarationBase, TypeElement {
+        kind: SyntaxKind.CallSignature;
+    }
+    interface ConstructSignatureDeclaration extends SignatureDeclarationBase, TypeElement {
+        kind: SyntaxKind.ConstructSignature;
+    }
+    type BindingName = Identifier | BindingPattern;
+    interface VariableDeclaration extends NamedDeclaration {
+        kind: SyntaxKind.VariableDeclaration;
+        parent: VariableDeclarationList | CatchClause;
+        name: BindingName;
+        exclamationToken?: ExclamationToken;
+        type?: TypeNode;
+        initializer?: Expression;
+    }
+    interface VariableDeclarationList extends Node {
+        kind: SyntaxKind.VariableDeclarationList;
+        parent: VariableStatement | ForStatement | ForOfStatement | ForInStatement;
+        declarations: NodeArray<VariableDeclaration>;
+    }
+    interface ParameterDeclaration extends NamedDeclaration, JSDocContainer {
+        kind: SyntaxKind.Parameter;
+        parent: SignatureDeclaration;
+        dotDotDotToken?: DotDotDotToken;
+        name: BindingName;
+        questionToken?: QuestionToken;
+        type?: TypeNode;
+        initializer?: Expression;
+    }
+    interface BindingElement extends NamedDeclaration {
+        kind: SyntaxKind.BindingElement;
+        parent: BindingPattern;
+        propertyName?: PropertyName;
+        dotDotDotToken?: DotDotDotToken;
+        name: BindingName;
+        initializer?: Expression;
+    }
+    type BindingElementGrandparent = BindingElement["parent"]["parent"];
+    interface PropertySignature extends TypeElement, JSDocContainer {
+        kind: SyntaxKind.PropertySignature;
+        name: PropertyName;
+        questionToken?: QuestionToken;
+        type?: TypeNode;
+        initializer?: Expression;
+    }
+    interface PropertyDeclaration extends ClassElement, JSDocContainer {
+        kind: SyntaxKind.PropertyDeclaration;
+        parent: ClassLikeDeclaration;
+        name: PropertyName;
+        questionToken?: QuestionToken;
+        exclamationToken?: ExclamationToken;
+        type?: TypeNode;
+        initializer?: Expression;
+    }
+    interface ObjectLiteralElement extends NamedDeclaration {
+        _objectLiteralBrandBrand: any;
+        name?: PropertyName;
+    }
+    type ObjectLiteralElementLike = PropertyAssignment | ShorthandPropertyAssignment | SpreadAssignment | MethodDeclaration | AccessorDeclaration;
+    interface PropertyAssignment extends ObjectLiteralElement, JSDocContainer {
+        parent: ObjectLiteralExpression;
+        kind: SyntaxKind.PropertyAssignment;
+        name: PropertyName;
+        questionToken?: QuestionToken;
+        initializer: Expression;
+    }
+    interface ShorthandPropertyAssignment extends ObjectLiteralElement, JSDocContainer {
+        parent: ObjectLiteralExpression;
+        kind: SyntaxKind.ShorthandPropertyAssignment;
+        name: Identifier;
+        questionToken?: QuestionToken;
+        equalsToken?: Token<SyntaxKind.EqualsToken>;
+        objectAssignmentInitializer?: Expression;
+    }
+    interface SpreadAssignment extends ObjectLiteralElement, JSDocContainer {
+        parent: ObjectLiteralExpression;
+        kind: SyntaxKind.SpreadAssignment;
+        expression: Expression;
+    }
+    type VariableLikeDeclaration = VariableDeclaration | ParameterDeclaration | BindingElement | PropertyDeclaration | PropertyAssignment | PropertySignature | JsxAttribute | ShorthandPropertyAssignment | EnumMember | JSDocPropertyTag | JSDocParameterTag;
+    interface PropertyLikeDeclaration extends NamedDeclaration {
+        name: PropertyName;
+    }
+    interface ObjectBindingPattern extends Node {
+        kind: SyntaxKind.ObjectBindingPattern;
+        parent: VariableDeclaration | ParameterDeclaration | BindingElement;
+        elements: NodeArray<BindingElement>;
+    }
+    interface ArrayBindingPattern extends Node {
+        kind: SyntaxKind.ArrayBindingPattern;
+        parent: VariableDeclaration | ParameterDeclaration | BindingElement;
+        elements: NodeArray<ArrayBindingElement>;
+    }
+    type BindingPattern = ObjectBindingPattern | ArrayBindingPattern;
+    type ArrayBindingElement = BindingElement | OmittedExpression;
+    /**
+     * Several node kinds share function-like features such as a signature,
+     * a name, and a body. These nodes should extend FunctionLikeDeclarationBase.
+     * Examples:
+     * - FunctionDeclaration
+     * - MethodDeclaration
+     * - AccessorDeclaration
+     */
+    interface FunctionLikeDeclarationBase extends SignatureDeclarationBase {
+        _functionLikeDeclarationBrand: any;
+        asteriskToken?: AsteriskToken;
+        questionToken?: QuestionToken;
+        body?: Block | Expression;
+    }
+    type FunctionLikeDeclaration = FunctionDeclaration | MethodDeclaration | GetAccessorDeclaration | SetAccessorDeclaration | ConstructorDeclaration | FunctionExpression | ArrowFunction;
+    /** @deprecated Use SignatureDeclaration */
+    type FunctionLike = SignatureDeclaration;
+    interface FunctionDeclaration extends FunctionLikeDeclarationBase, DeclarationStatement {
+        kind: SyntaxKind.FunctionDeclaration;
+        name?: Identifier;
+        body?: FunctionBody;
+    }
+    interface MethodSignature extends SignatureDeclarationBase, TypeElement {
+        kind: SyntaxKind.MethodSignature;
+        parent: ObjectTypeDeclaration;
+        name: PropertyName;
+    }
+    interface MethodDeclaration extends FunctionLikeDeclarationBase, ClassElement, ObjectLiteralElement, JSDocContainer {
+        kind: SyntaxKind.MethodDeclaration;
+        parent: ClassLikeDeclaration | ObjectLiteralExpression;
+        name: PropertyName;
+        body?: FunctionBody;
+    }
+    interface ConstructorDeclaration extends FunctionLikeDeclarationBase, ClassElement, JSDocContainer {
+        kind: SyntaxKind.Constructor;
+        parent: ClassLikeDeclaration;
+        body?: FunctionBody;
+        returnFlowNode?: FlowNode;
+    }
+    /** For when we encounter a semicolon in a class declaration. ES6 allows these as class elements. */
+    interface SemicolonClassElement extends ClassElement {
+        kind: SyntaxKind.SemicolonClassElement;
+        parent: ClassLikeDeclaration;
+    }
+    interface GetAccessorDeclaration extends FunctionLikeDeclarationBase, ClassElement, ObjectLiteralElement, JSDocContainer {
+        kind: SyntaxKind.GetAccessor;
+        parent: ClassLikeDeclaration | ObjectLiteralExpression;
+        name: PropertyName;
+        body?: FunctionBody;
+    }
+    interface SetAccessorDeclaration extends FunctionLikeDeclarationBase, ClassElement, ObjectLiteralElement, JSDocContainer {
+        kind: SyntaxKind.SetAccessor;
+        parent: ClassLikeDeclaration | ObjectLiteralExpression;
+        name: PropertyName;
+        body?: FunctionBody;
+    }
+    type AccessorDeclaration = GetAccessorDeclaration | SetAccessorDeclaration;
+    interface IndexSignatureDeclaration extends SignatureDeclarationBase, ClassElement, TypeElement {
+        kind: SyntaxKind.IndexSignature;
+        parent: ObjectTypeDeclaration;
+    }
+    interface TypeNode extends Node {
+        _typeNodeBrand: any;
+    }
+    interface KeywordTypeNode extends TypeNode {
+        kind: SyntaxKind.AnyKeyword | SyntaxKind.UnknownKeyword | SyntaxKind.NumberKeyword | SyntaxKind.ObjectKeyword | SyntaxKind.BooleanKeyword | SyntaxKind.StringKeyword | SyntaxKind.SymbolKeyword | SyntaxKind.ThisKeyword | SyntaxKind.VoidKeyword | SyntaxKind.UndefinedKeyword | SyntaxKind.NullKeyword | SyntaxKind.NeverKeyword;
+    }
+    interface ImportTypeNode extends NodeWithTypeArguments {
+        kind: SyntaxKind.ImportType;
+        isTypeOf?: boolean;
+        argument: TypeNode;
+        qualifier?: EntityName;
+    }
+    type LiteralImportTypeNode = ImportTypeNode & {
+        argument: LiteralTypeNode & {
+            literal: StringLiteral;
+        };
+    };
+    interface ThisTypeNode extends TypeNode {
+        kind: SyntaxKind.ThisType;
+    }
+    type FunctionOrConstructorTypeNode = FunctionTypeNode | ConstructorTypeNode;
+    interface FunctionOrConstructorTypeNodeBase extends TypeNode, SignatureDeclarationBase {
+        kind: SyntaxKind.FunctionType | SyntaxKind.ConstructorType;
+        type: TypeNode;
+    }
+    interface FunctionTypeNode extends FunctionOrConstructorTypeNodeBase {
+        kind: SyntaxKind.FunctionType;
+    }
+    interface ConstructorTypeNode extends FunctionOrConstructorTypeNodeBase {
+        kind: SyntaxKind.ConstructorType;
+    }
+    interface NodeWithTypeArguments extends TypeNode {
+        typeArguments?: NodeArray<TypeNode>;
+    }
+    type TypeReferenceType = TypeReferenceNode | ExpressionWithTypeArguments;
+    interface TypeReferenceNode extends NodeWithTypeArguments {
+        kind: SyntaxKind.TypeReference;
+        typeName: EntityName;
+    }
+    interface TypePredicateNode extends TypeNode {
+        kind: SyntaxKind.TypePredicate;
+        parent: SignatureDeclaration;
+        parameterName: Identifier | ThisTypeNode;
+        type: TypeNode;
+    }
+    interface TypeQueryNode extends TypeNode {
+        kind: SyntaxKind.TypeQuery;
+        exprName: EntityName;
+    }
+    interface TypeLiteralNode extends TypeNode, Declaration {
+        kind: SyntaxKind.TypeLiteral;
+        members: NodeArray<TypeElement>;
+    }
+    interface ArrayTypeNode extends TypeNode {
+        kind: SyntaxKind.ArrayType;
+        elementType: TypeNode;
+    }
+    interface TupleTypeNode extends TypeNode {
+        kind: SyntaxKind.TupleType;
+        elementTypes: NodeArray<TypeNode>;
+    }
+    type UnionOrIntersectionTypeNode = UnionTypeNode | IntersectionTypeNode;
+    interface UnionTypeNode extends TypeNode {
+        kind: SyntaxKind.UnionType;
+        types: NodeArray<TypeNode>;
+    }
+    interface IntersectionTypeNode extends TypeNode {
+        kind: SyntaxKind.IntersectionType;
+        types: NodeArray<TypeNode>;
+    }
+    interface ConditionalTypeNode extends TypeNode {
+        kind: SyntaxKind.ConditionalType;
+        checkType: TypeNode;
+        extendsType: TypeNode;
+        trueType: TypeNode;
+        falseType: TypeNode;
+    }
+    interface InferTypeNode extends TypeNode {
+        kind: SyntaxKind.InferType;
+        typeParameter: TypeParameterDeclaration;
+    }
+    interface ParenthesizedTypeNode extends TypeNode {
+        kind: SyntaxKind.ParenthesizedType;
+        type: TypeNode;
+    }
+    interface TypeOperatorNode extends TypeNode {
+        kind: SyntaxKind.TypeOperator;
+        operator: SyntaxKind.KeyOfKeyword | SyntaxKind.UniqueKeyword;
+        type: TypeNode;
+    }
+    interface UniqueTypeOperatorNode extends TypeOperatorNode {
+        operator: SyntaxKind.UniqueKeyword;
+    }
+    interface IndexedAccessTypeNode extends TypeNode {
+        kind: SyntaxKind.IndexedAccessType;
+        objectType: TypeNode;
+        indexType: TypeNode;
+    }
+    interface MappedTypeNode extends TypeNode, Declaration {
+        kind: SyntaxKind.MappedType;
+        readonlyToken?: ReadonlyToken | PlusToken | MinusToken;
+        typeParameter: TypeParameterDeclaration;
+        questionToken?: QuestionToken | PlusToken | MinusToken;
+        type?: TypeNode;
+    }
+    interface LiteralTypeNode extends TypeNode {
+        kind: SyntaxKind.LiteralType;
+        literal: BooleanLiteral | LiteralExpression | PrefixUnaryExpression;
+    }
+    interface StringLiteral extends LiteralExpression {
+        kind: SyntaxKind.StringLiteral;
+        textSourceNode?: Identifier | StringLiteralLike | NumericLiteral;
+        /** Note: this is only set when synthesizing a node, not during parsing. */
+        singleQuote?: boolean;
+    }
+    type StringLiteralLike = StringLiteral | NoSubstitutionTemplateLiteral;
+    interface Expression extends Node {
+        _expressionBrand: any;
+    }
+    interface OmittedExpression extends Expression {
+        kind: SyntaxKind.OmittedExpression;
+    }
+    interface PartiallyEmittedExpression extends LeftHandSideExpression {
+        kind: SyntaxKind.PartiallyEmittedExpression;
+        expression: Expression;
+    }
+    interface UnaryExpression extends Expression {
+        _unaryExpressionBrand: any;
+    }
+    /** Deprecated, please use UpdateExpression */
+    type IncrementExpression = UpdateExpression;
+    interface UpdateExpression extends UnaryExpression {
+        _updateExpressionBrand: any;
+    }
+    type PrefixUnaryOperator = SyntaxKind.PlusPlusToken | SyntaxKind.MinusMinusToken | SyntaxKind.PlusToken | SyntaxKind.MinusToken | SyntaxKind.TildeToken | SyntaxKind.ExclamationToken;
+    interface PrefixUnaryExpression extends UpdateExpression {
+        kind: SyntaxKind.PrefixUnaryExpression;
+        operator: PrefixUnaryOperator;
+        operand: UnaryExpression;
+    }
+    type PostfixUnaryOperator = SyntaxKind.PlusPlusToken | SyntaxKind.MinusMinusToken;
+    interface PostfixUnaryExpression extends UpdateExpression {
+        kind: SyntaxKind.PostfixUnaryExpression;
+        operand: LeftHandSideExpression;
+        operator: PostfixUnaryOperator;
+    }
+    interface LeftHandSideExpression extends UpdateExpression {
+        _leftHandSideExpressionBrand: any;
+    }
+    interface MemberExpression extends LeftHandSideExpression {
+        _memberExpressionBrand: any;
+    }
+    interface PrimaryExpression extends MemberExpression {
+        _primaryExpressionBrand: any;
+    }
+    interface NullLiteral extends PrimaryExpression, TypeNode {
+        kind: SyntaxKind.NullKeyword;
+    }
+    interface BooleanLiteral extends PrimaryExpression, TypeNode {
+        kind: SyntaxKind.TrueKeyword | SyntaxKind.FalseKeyword;
+    }
+    interface ThisExpression extends PrimaryExpression, KeywordTypeNode {
+        kind: SyntaxKind.ThisKeyword;
+    }
+    interface SuperExpression extends PrimaryExpression {
+        kind: SyntaxKind.SuperKeyword;
+    }
+    interface ImportExpression extends PrimaryExpression {
+        kind: SyntaxKind.ImportKeyword;
+    }
+    interface DeleteExpression extends UnaryExpression {
+        kind: SyntaxKind.DeleteExpression;
+        expression: UnaryExpression;
+    }
+    interface TypeOfExpression extends UnaryExpression {
+        kind: SyntaxKind.TypeOfExpression;
+        expression: UnaryExpression;
+    }
+    interface VoidExpression extends UnaryExpression {
+        kind: SyntaxKind.VoidExpression;
+        expression: UnaryExpression;
+    }
+    interface AwaitExpression extends UnaryExpression {
+        kind: SyntaxKind.AwaitExpression;
+        expression: UnaryExpression;
+    }
+    interface YieldExpression extends Expression {
+        kind: SyntaxKind.YieldExpression;
+        asteriskToken?: AsteriskToken;
+        expression?: Expression;
+    }
+    type ExponentiationOperator = SyntaxKind.AsteriskAsteriskToken;
+    type MultiplicativeOperator = SyntaxKind.AsteriskToken | SyntaxKind.SlashToken | SyntaxKind.PercentToken;
+    type MultiplicativeOperatorOrHigher = ExponentiationOperator | MultiplicativeOperator;
+    type AdditiveOperator = SyntaxKind.PlusToken | SyntaxKind.MinusToken;
+    type AdditiveOperatorOrHigher = MultiplicativeOperatorOrHigher | AdditiveOperator;
+    type ShiftOperator = SyntaxKind.LessThanLessThanToken | SyntaxKind.GreaterThanGreaterThanToken | SyntaxKind.GreaterThanGreaterThanGreaterThanToken;
+    type ShiftOperatorOrHigher = AdditiveOperatorOrHigher | ShiftOperator;
+    type RelationalOperator = SyntaxKind.LessThanToken | SyntaxKind.LessThanEqualsToken | SyntaxKind.GreaterThanToken | SyntaxKind.GreaterThanEqualsToken | SyntaxKind.InstanceOfKeyword | SyntaxKind.InKeyword;
+    type RelationalOperatorOrHigher = ShiftOperatorOrHigher | RelationalOperator;
+    type EqualityOperator = SyntaxKind.EqualsEqualsToken | SyntaxKind.EqualsEqualsEqualsToken | SyntaxKind.ExclamationEqualsEqualsToken | SyntaxKind.ExclamationEqualsToken;
+    type EqualityOperatorOrHigher = RelationalOperatorOrHigher | EqualityOperator;
+    type BitwiseOperator = SyntaxKind.AmpersandToken | SyntaxKind.BarToken | SyntaxKind.CaretToken;
+    type BitwiseOperatorOrHigher = EqualityOperatorOrHigher | BitwiseOperator;
+    type LogicalOperator = SyntaxKind.AmpersandAmpersandToken | SyntaxKind.BarBarToken;
+    type LogicalOperatorOrHigher = BitwiseOperatorOrHigher | LogicalOperator;
+    type CompoundAssignmentOperator = SyntaxKind.PlusEqualsToken | SyntaxKind.MinusEqualsToken | SyntaxKind.AsteriskAsteriskEqualsToken | SyntaxKind.AsteriskEqualsToken | SyntaxKind.SlashEqualsToken | SyntaxKind.PercentEqualsToken | SyntaxKind.AmpersandEqualsToken | SyntaxKind.BarEqualsToken | SyntaxKind.CaretEqualsToken | SyntaxKind.LessThanLessThanEqualsToken | SyntaxKind.GreaterThanGreaterThanGreaterThanEqualsToken | SyntaxKind.GreaterThanGreaterThanEqualsToken;
+    type AssignmentOperator = SyntaxKind.EqualsToken | CompoundAssignmentOperator;
+    type AssignmentOperatorOrHigher = LogicalOperatorOrHigher | AssignmentOperator;
+    type BinaryOperator = AssignmentOperatorOrHigher | SyntaxKind.CommaToken;
+    type BinaryOperatorToken = Token<BinaryOperator>;
+    interface BinaryExpression extends Expression, Declaration {
+        kind: SyntaxKind.BinaryExpression;
+        left: Expression;
+        operatorToken: BinaryOperatorToken;
+        right: Expression;
+    }
+    type AssignmentOperatorToken = Token<AssignmentOperator>;
+    interface AssignmentExpression<TOperator extends AssignmentOperatorToken> extends BinaryExpression {
+        left: LeftHandSideExpression;
+        operatorToken: TOperator;
+    }
+    interface ObjectDestructuringAssignment extends AssignmentExpression<EqualsToken> {
+        left: ObjectLiteralExpression;
+    }
+    interface ArrayDestructuringAssignment extends AssignmentExpression<EqualsToken> {
+        left: ArrayLiteralExpression;
+    }
+    type DestructuringAssignment = ObjectDestructuringAssignment | ArrayDestructuringAssignment;
+    type BindingOrAssignmentElement = VariableDeclaration | ParameterDeclaration | BindingElement | PropertyAssignment | ShorthandPropertyAssignment | SpreadAssignment | OmittedExpression | SpreadElement | ArrayLiteralExpression | ObjectLiteralExpression | AssignmentExpression<EqualsToken> | Identifier | PropertyAccessExpression | ElementAccessExpression;
+    type BindingOrAssignmentElementRestIndicator = DotDotDotToken | SpreadElement | SpreadAssignment;
+    type BindingOrAssignmentElementTarget = BindingOrAssignmentPattern | Identifier | PropertyAccessExpression | ElementAccessExpression | OmittedExpression;
+    type ObjectBindingOrAssignmentPattern = ObjectBindingPattern | ObjectLiteralExpression;
+    type ArrayBindingOrAssignmentPattern = ArrayBindingPattern | ArrayLiteralExpression;
+    type AssignmentPattern = ObjectLiteralExpression | ArrayLiteralExpression;
+    type BindingOrAssignmentPattern = ObjectBindingOrAssignmentPattern | ArrayBindingOrAssignmentPattern;
+    interface ConditionalExpression extends Expression {
+        kind: SyntaxKind.ConditionalExpression;
+        condition: Expression;
+        questionToken: QuestionToken;
+        whenTrue: Expression;
+        colonToken: ColonToken;
+        whenFalse: Expression;
+    }
+    type FunctionBody = Block;
+    type ConciseBody = FunctionBody | Expression;
+    interface FunctionExpression extends PrimaryExpression, FunctionLikeDeclarationBase, JSDocContainer {
+        kind: SyntaxKind.FunctionExpression;
+        name?: Identifier;
+        body: FunctionBody;
+    }
+    interface ArrowFunction extends Expression, FunctionLikeDeclarationBase, JSDocContainer {
+        kind: SyntaxKind.ArrowFunction;
+        equalsGreaterThanToken: EqualsGreaterThanToken;
+        body: ConciseBody;
+        name: never;
+    }
+    interface LiteralLikeNode extends Node {
+        text: string;
+        isUnterminated?: boolean;
+        hasExtendedUnicodeEscape?: boolean;
+    }
+    interface LiteralExpression extends LiteralLikeNode, PrimaryExpression {
+        _literalExpressionBrand: any;
+    }
+    interface RegularExpressionLiteral extends LiteralExpression {
+        kind: SyntaxKind.RegularExpressionLiteral;
+    }
+    interface NoSubstitutionTemplateLiteral extends LiteralExpression {
+        kind: SyntaxKind.NoSubstitutionTemplateLiteral;
+    }
+    enum TokenFlags {
+        None = 0,
+        PrecedingLineBreak = 1,
+        PrecedingJSDocComment = 2,
+        Unterminated = 4,
+        ExtendedUnicodeEscape = 8,
+        Scientific = 16,
+        Octal = 32,
+        HexSpecifier = 64,
+        BinarySpecifier = 128,
+        OctalSpecifier = 256,
+        ContainsSeparator = 512,
+        BinaryOrOctalSpecifier = 384,
+        NumericLiteralFlags = 1008
+    }
+    interface NumericLiteral extends LiteralExpression {
+        kind: SyntaxKind.NumericLiteral;
+        numericLiteralFlags: TokenFlags;
+    }
+    interface TemplateHead extends LiteralLikeNode {
+        kind: SyntaxKind.TemplateHead;
+        parent: TemplateExpression;
+    }
+    interface TemplateMiddle extends LiteralLikeNode {
+        kind: SyntaxKind.TemplateMiddle;
+        parent: TemplateSpan;
+    }
+    interface TemplateTail extends LiteralLikeNode {
+        kind: SyntaxKind.TemplateTail;
+        parent: TemplateSpan;
+    }
+    type TemplateLiteral = TemplateExpression | NoSubstitutionTemplateLiteral;
+    interface TemplateExpression extends PrimaryExpression {
+        kind: SyntaxKind.TemplateExpression;
+        head: TemplateHead;
+        templateSpans: NodeArray<TemplateSpan>;
+    }
+    interface TemplateSpan extends Node {
+        kind: SyntaxKind.TemplateSpan;
+        parent: TemplateExpression;
+        expression: Expression;
+        literal: TemplateMiddle | TemplateTail;
+    }
+    interface ParenthesizedExpression extends PrimaryExpression, JSDocContainer {
+        kind: SyntaxKind.ParenthesizedExpression;
+        expression: Expression;
+    }
+    interface ArrayLiteralExpression extends PrimaryExpression {
+        kind: SyntaxKind.ArrayLiteralExpression;
+        elements: NodeArray<Expression>;
+        multiLine?: boolean;
+    }
+    interface SpreadElement extends Expression {
+        kind: SyntaxKind.SpreadElement;
+        parent: ArrayLiteralExpression | CallExpression | NewExpression;
+        expression: Expression;
+    }
+    /**
+     * This interface is a base interface for ObjectLiteralExpression and JSXAttributes to extend from. JSXAttributes is similar to
+     * ObjectLiteralExpression in that it contains array of properties; however, JSXAttributes' properties can only be
+     * JSXAttribute or JSXSpreadAttribute. ObjectLiteralExpression, on the other hand, can only have properties of type
+     * ObjectLiteralElement (e.g. PropertyAssignment, ShorthandPropertyAssignment etc.)
+     */
+    interface ObjectLiteralExpressionBase<T extends ObjectLiteralElement> extends PrimaryExpression, Declaration {
+        properties: NodeArray<T>;
+    }
+    interface ObjectLiteralExpression extends ObjectLiteralExpressionBase<ObjectLiteralElementLike> {
+        kind: SyntaxKind.ObjectLiteralExpression;
+        multiLine?: boolean;
+    }
+    type EntityNameExpression = Identifier | PropertyAccessEntityNameExpression;
+    type EntityNameOrEntityNameExpression = EntityName | EntityNameExpression;
+    interface PropertyAccessExpression extends MemberExpression, NamedDeclaration {
+        kind: SyntaxKind.PropertyAccessExpression;
+        expression: LeftHandSideExpression;
+        name: Identifier;
+    }
+    interface SuperPropertyAccessExpression extends PropertyAccessExpression {
+        expression: SuperExpression;
+    }
+    /** Brand for a PropertyAccessExpression which, like a QualifiedName, consists of a sequence of identifiers separated by dots. */
+    interface PropertyAccessEntityNameExpression extends PropertyAccessExpression {
+        _propertyAccessExpressionLikeQualifiedNameBrand?: any;
+        expression: EntityNameExpression;
+    }
+    interface ElementAccessExpression extends MemberExpression {
+        kind: SyntaxKind.ElementAccessExpression;
+        expression: LeftHandSideExpression;
+        argumentExpression: Expression;
+    }
+    interface SuperElementAccessExpression extends ElementAccessExpression {
+        expression: SuperExpression;
+    }
+    type SuperProperty = SuperPropertyAccessExpression | SuperElementAccessExpression;
+    interface CallExpression extends LeftHandSideExpression, Declaration {
+        kind: SyntaxKind.CallExpression;
+        expression: LeftHandSideExpression;
+        typeArguments?: NodeArray<TypeNode>;
+        arguments: NodeArray<Expression>;
+    }
+    interface SuperCall extends CallExpression {
+        expression: SuperExpression;
+    }
+    interface ImportCall extends CallExpression {
+        expression: ImportExpression;
+    }
+    interface ExpressionWithTypeArguments extends NodeWithTypeArguments {
+        kind: SyntaxKind.ExpressionWithTypeArguments;
+        parent: HeritageClause;
+        expression: LeftHandSideExpression;
+    }
+    interface NewExpression extends PrimaryExpression, Declaration {
+        kind: SyntaxKind.NewExpression;
+        expression: LeftHandSideExpression;
+        typeArguments?: NodeArray<TypeNode>;
+        arguments?: NodeArray<Expression>;
+    }
+    interface TaggedTemplateExpression extends MemberExpression {
+        kind: SyntaxKind.TaggedTemplateExpression;
+        tag: LeftHandSideExpression;
+        typeArguments?: NodeArray<TypeNode>;
+        template: TemplateLiteral;
+    }
+    type CallLikeExpression = CallExpression | NewExpression | TaggedTemplateExpression | Decorator | JsxOpeningLikeElement;
+    interface AsExpression extends Expression {
+        kind: SyntaxKind.AsExpression;
+        expression: Expression;
+        type: TypeNode;
+    }
+    interface TypeAssertion extends UnaryExpression {
+        kind: SyntaxKind.TypeAssertionExpression;
+        type: TypeNode;
+        expression: UnaryExpression;
+    }
+    type AssertionExpression = TypeAssertion | AsExpression;
+    interface NonNullExpression extends LeftHandSideExpression {
+        kind: SyntaxKind.NonNullExpression;
+        expression: Expression;
+    }
+    interface MetaProperty extends PrimaryExpression {
+        kind: SyntaxKind.MetaProperty;
+        keywordToken: SyntaxKind.NewKeyword | SyntaxKind.ImportKeyword;
+        name: Identifier;
+    }
+    interface JsxElement extends PrimaryExpression {
+        kind: SyntaxKind.JsxElement;
+        openingElement: JsxOpeningElement;
+        children: NodeArray<JsxChild>;
+        closingElement: JsxClosingElement;
+    }
+    type JsxOpeningLikeElement = JsxSelfClosingElement | JsxOpeningElement;
+    type JsxAttributeLike = JsxAttribute | JsxSpreadAttribute;
+    type JsxTagNameExpression = PrimaryExpression | PropertyAccessExpression;
+    interface JsxAttributes extends ObjectLiteralExpressionBase<JsxAttributeLike> {
+        parent: JsxOpeningLikeElement;
+    }
+    interface JsxOpeningElement extends Expression {
+        kind: SyntaxKind.JsxOpeningElement;
+        parent: JsxElement;
+        tagName: JsxTagNameExpression;
+        typeArguments?: NodeArray<TypeNode>;
+        attributes: JsxAttributes;
+    }
+    interface JsxSelfClosingElement extends PrimaryExpression {
+        kind: SyntaxKind.JsxSelfClosingElement;
+        tagName: JsxTagNameExpression;
+        typeArguments?: NodeArray<TypeNode>;
+        attributes: JsxAttributes;
+    }
+    interface JsxFragment extends PrimaryExpression {
+        kind: SyntaxKind.JsxFragment;
+        openingFragment: JsxOpeningFragment;
+        children: NodeArray<JsxChild>;
+        closingFragment: JsxClosingFragment;
+    }
+    interface JsxOpeningFragment extends Expression {
+        kind: SyntaxKind.JsxOpeningFragment;
+        parent: JsxFragment;
+    }
+    interface JsxClosingFragment extends Expression {
+        kind: SyntaxKind.JsxClosingFragment;
+        parent: JsxFragment;
+    }
+    interface JsxAttribute extends ObjectLiteralElement {
+        kind: SyntaxKind.JsxAttribute;
+        parent: JsxAttributes;
+        name: Identifier;
+        initializer?: StringLiteral | JsxExpression;
+    }
+    interface JsxSpreadAttribute extends ObjectLiteralElement {
+        kind: SyntaxKind.JsxSpreadAttribute;
+        parent: JsxAttributes;
+        expression: Expression;
+    }
+    interface JsxClosingElement extends Node {
+        kind: SyntaxKind.JsxClosingElement;
+        parent: JsxElement;
+        tagName: JsxTagNameExpression;
+    }
+    interface JsxExpression extends Expression {
+        kind: SyntaxKind.JsxExpression;
+        parent: JsxElement | JsxAttributeLike;
+        dotDotDotToken?: Token<SyntaxKind.DotDotDotToken>;
+        expression?: Expression;
+    }
+    interface JsxText extends Node {
+        kind: SyntaxKind.JsxText;
+        containsOnlyWhiteSpaces: boolean;
+        parent: JsxElement;
+    }
+    type JsxChild = JsxText | JsxExpression | JsxElement | JsxSelfClosingElement | JsxFragment;
+    interface Statement extends Node {
+        _statementBrand: any;
+    }
+    interface NotEmittedStatement extends Statement {
+        kind: SyntaxKind.NotEmittedStatement;
+    }
+    /**
+     * Marks the end of transformed declaration to properly emit exports.
+     */
+    interface EndOfDeclarationMarker extends Statement {
+        kind: SyntaxKind.EndOfDeclarationMarker;
+    }
+    /**
+     * A list of comma-separated expressions. This node is only created by transformations.
+     */
+    interface CommaListExpression extends Expression {
+        kind: SyntaxKind.CommaListExpression;
+        elements: NodeArray<Expression>;
+    }
+    /**
+     * Marks the beginning of a merged transformed declaration.
+     */
+    interface MergeDeclarationMarker extends Statement {
+        kind: SyntaxKind.MergeDeclarationMarker;
+    }
+    interface EmptyStatement extends Statement {
+        kind: SyntaxKind.EmptyStatement;
+    }
+    interface DebuggerStatement extends Statement {
+        kind: SyntaxKind.DebuggerStatement;
+    }
+    interface MissingDeclaration extends DeclarationStatement {
+        kind: SyntaxKind.MissingDeclaration;
+        name?: Identifier;
+    }
+    type BlockLike = SourceFile | Block | ModuleBlock | CaseOrDefaultClause;
+    interface Block extends Statement {
+        kind: SyntaxKind.Block;
+        statements: NodeArray<Statement>;
+        multiLine?: boolean;
+    }
+    interface VariableStatement extends Statement, JSDocContainer {
+        kind: SyntaxKind.VariableStatement;
+        declarationList: VariableDeclarationList;
+    }
+    interface ExpressionStatement extends Statement, JSDocContainer {
+        kind: SyntaxKind.ExpressionStatement;
+        expression: Expression;
+    }
+    interface PrologueDirective extends ExpressionStatement {
+        expression: StringLiteral;
+    }
+    interface IfStatement extends Statement {
+        kind: SyntaxKind.IfStatement;
+        expression: Expression;
+        thenStatement: Statement;
+        elseStatement?: Statement;
+    }
+    interface IterationStatement extends Statement {
+        statement: Statement;
+    }
+    interface DoStatement extends IterationStatement {
+        kind: SyntaxKind.DoStatement;
+        expression: Expression;
+    }
+    interface WhileStatement extends IterationStatement {
+        kind: SyntaxKind.WhileStatement;
+        expression: Expression;
+    }
+    type ForInitializer = VariableDeclarationList | Expression;
+    interface ForStatement extends IterationStatement {
+        kind: SyntaxKind.ForStatement;
+        initializer?: ForInitializer;
+        condition?: Expression;
+        incrementor?: Expression;
+    }
+    type ForInOrOfStatement = ForInStatement | ForOfStatement;
+    interface ForInStatement extends IterationStatement {
+        kind: SyntaxKind.ForInStatement;
+        initializer: ForInitializer;
+        expression: Expression;
+    }
+    interface ForOfStatement extends IterationStatement {
+        kind: SyntaxKind.ForOfStatement;
+        awaitModifier?: AwaitKeywordToken;
+        initializer: ForInitializer;
+        expression: Expression;
+    }
+    interface BreakStatement extends Statement {
+        kind: SyntaxKind.BreakStatement;
+        label?: Identifier;
+    }
+    interface ContinueStatement extends Statement {
+        kind: SyntaxKind.ContinueStatement;
+        label?: Identifier;
+    }
+    type BreakOrContinueStatement = BreakStatement | ContinueStatement;
+    interface ReturnStatement extends Statement {
+        kind: SyntaxKind.ReturnStatement;
+        expression?: Expression;
+    }
+    interface WithStatement extends Statement {
+        kind: SyntaxKind.WithStatement;
+        expression: Expression;
+        statement: Statement;
+    }
+    interface SwitchStatement extends Statement {
+        kind: SyntaxKind.SwitchStatement;
+        expression: Expression;
+        caseBlock: CaseBlock;
+        possiblyExhaustive?: boolean;
+    }
+    interface CaseBlock extends Node {
+        kind: SyntaxKind.CaseBlock;
+        parent: SwitchStatement;
+        clauses: NodeArray<CaseOrDefaultClause>;
+    }
+    interface CaseClause extends Node {
+        kind: SyntaxKind.CaseClause;
+        parent: CaseBlock;
+        expression: Expression;
+        statements: NodeArray<Statement>;
+    }
+    interface DefaultClause extends Node {
+        kind: SyntaxKind.DefaultClause;
+        parent: CaseBlock;
+        statements: NodeArray<Statement>;
+    }
+    type CaseOrDefaultClause = CaseClause | DefaultClause;
+    interface LabeledStatement extends Statement, JSDocContainer {
+        kind: SyntaxKind.LabeledStatement;
+        label: Identifier;
+        statement: Statement;
+    }
+    interface ThrowStatement extends Statement {
+        kind: SyntaxKind.ThrowStatement;
+        expression?: Expression;
+    }
+    interface TryStatement extends Statement {
+        kind: SyntaxKind.TryStatement;
+        tryBlock: Block;
+        catchClause?: CatchClause;
+        finallyBlock?: Block;
+    }
+    interface CatchClause extends Node {
+        kind: SyntaxKind.CatchClause;
+        parent: TryStatement;
+        variableDeclaration?: VariableDeclaration;
+        block: Block;
+    }
+    type ObjectTypeDeclaration = ClassLikeDeclaration | InterfaceDeclaration | TypeLiteralNode;
+    type DeclarationWithTypeParameters = SignatureDeclaration | ClassLikeDeclaration | InterfaceDeclaration | TypeAliasDeclaration | JSDocTemplateTag | JSDocTypedefTag | JSDocCallbackTag | JSDocSignature;
+    interface ClassLikeDeclarationBase extends NamedDeclaration, JSDocContainer {
+        kind: SyntaxKind.ClassDeclaration | SyntaxKind.ClassExpression;
+        name?: Identifier;
+        typeParameters?: NodeArray<TypeParameterDeclaration>;
+        heritageClauses?: NodeArray<HeritageClause>;
+        members: NodeArray<ClassElement>;
+    }
+    interface ClassDeclaration extends ClassLikeDeclarationBase, DeclarationStatement {
+        kind: SyntaxKind.ClassDeclaration;
+        /** May be undefined in `export default class { ... }`. */
+        name?: Identifier;
+    }
+    interface ClassExpression extends ClassLikeDeclarationBase, PrimaryExpression {
+        kind: SyntaxKind.ClassExpression;
+    }
+    type ClassLikeDeclaration = ClassDeclaration | ClassExpression;
+    interface ClassElement extends NamedDeclaration {
+        _classElementBrand: any;
+        name?: PropertyName;
+    }
+    interface TypeElement extends NamedDeclaration {
+        _typeElementBrand: any;
+        name?: PropertyName;
+        questionToken?: QuestionToken;
+    }
+    interface InterfaceDeclaration extends DeclarationStatement, JSDocContainer {
+        kind: SyntaxKind.InterfaceDeclaration;
+        name: Identifier;
+        typeParameters?: NodeArray<TypeParameterDeclaration>;
+        heritageClauses?: NodeArray<HeritageClause>;
+        members: NodeArray<TypeElement>;
+    }
+    interface HeritageClause extends Node {
+        kind: SyntaxKind.HeritageClause;
+        parent: InterfaceDeclaration | ClassLikeDeclaration;
+        token: SyntaxKind.ExtendsKeyword | SyntaxKind.ImplementsKeyword;
+        types: NodeArray<ExpressionWithTypeArguments>;
+    }
+    interface TypeAliasDeclaration extends DeclarationStatement, JSDocContainer {
+        kind: SyntaxKind.TypeAliasDeclaration;
+        name: Identifier;
+        typeParameters?: NodeArray<TypeParameterDeclaration>;
+        type: TypeNode;
+    }
+    interface EnumMember extends NamedDeclaration, JSDocContainer {
+        kind: SyntaxKind.EnumMember;
+        parent: EnumDeclaration;
+        name: PropertyName;
+        initializer?: Expression;
+    }
+    interface EnumDeclaration extends DeclarationStatement, JSDocContainer {
+        kind: SyntaxKind.EnumDeclaration;
+        name: Identifier;
+        members: NodeArray<EnumMember>;
+    }
+    type ModuleName = Identifier | StringLiteral;
+    type ModuleBody = NamespaceBody | JSDocNamespaceBody;
+    interface AmbientModuleDeclaration extends ModuleDeclaration {
+        body?: ModuleBlock;
+    }
+    interface ModuleDeclaration extends DeclarationStatement, JSDocContainer {
+        kind: SyntaxKind.ModuleDeclaration;
+        parent: ModuleBody | SourceFile;
+        name: ModuleName;
+        body?: ModuleBody | JSDocNamespaceDeclaration;
+    }
+    type NamespaceBody = ModuleBlock | NamespaceDeclaration;
+    interface NamespaceDeclaration extends ModuleDeclaration {
+        name: Identifier;
+        body: NamespaceBody;
+    }
+    type JSDocNamespaceBody = Identifier | JSDocNamespaceDeclaration;
+    interface JSDocNamespaceDeclaration extends ModuleDeclaration {
+        name: Identifier;
+        body?: JSDocNamespaceBody;
+    }
+    interface ModuleBlock extends Node, Statement {
+        kind: SyntaxKind.ModuleBlock;
+        parent: ModuleDeclaration;
+        statements: NodeArray<Statement>;
+    }
+    type ModuleReference = EntityName | ExternalModuleReference;
+    /**
+     * One of:
+     * - import x = require("mod");
+     * - import x = M.x;
+     */
+    interface ImportEqualsDeclaration extends DeclarationStatement, JSDocContainer {
+        kind: SyntaxKind.ImportEqualsDeclaration;
+        parent: SourceFile | ModuleBlock;
+        name: Identifier;
+        moduleReference: ModuleReference;
+    }
+    interface ExternalModuleReference extends Node {
+        kind: SyntaxKind.ExternalModuleReference;
+        parent: ImportEqualsDeclaration;
+        expression: Expression;
+    }
+    interface ImportDeclaration extends Statement {
+        kind: SyntaxKind.ImportDeclaration;
+        parent: SourceFile | ModuleBlock;
+        importClause?: ImportClause;
+        /** If this is not a StringLiteral it will be a grammar error. */
+        moduleSpecifier: Expression;
+    }
+    type NamedImportBindings = NamespaceImport | NamedImports;
+    interface ImportClause extends NamedDeclaration {
+        kind: SyntaxKind.ImportClause;
+        parent: ImportDeclaration;
+        name?: Identifier;
+        namedBindings?: NamedImportBindings;
+    }
+    interface NamespaceImport extends NamedDeclaration {
+        kind: SyntaxKind.NamespaceImport;
+        parent: ImportClause;
+        name: Identifier;
+    }
+    interface NamespaceExportDeclaration extends DeclarationStatement {
+        kind: SyntaxKind.NamespaceExportDeclaration;
+        name: Identifier;
+    }
+    interface ExportDeclaration extends DeclarationStatement {
+        kind: SyntaxKind.ExportDeclaration;
+        parent: SourceFile | ModuleBlock;
+        /** Will not be assigned in the case of `export * from "foo";` */
+        exportClause?: NamedExports;
+        /** If this is not a StringLiteral it will be a grammar error. */
+        moduleSpecifier?: Expression;
+    }
+    interface NamedImports extends Node {
+        kind: SyntaxKind.NamedImports;
+        parent: ImportClause;
+        elements: NodeArray<ImportSpecifier>;
+    }
+    interface NamedExports extends Node {
+        kind: SyntaxKind.NamedExports;
+        parent: ExportDeclaration;
+        elements: NodeArray<ExportSpecifier>;
+    }
+    type NamedImportsOrExports = NamedImports | NamedExports;
+    interface ImportSpecifier extends NamedDeclaration {
+        kind: SyntaxKind.ImportSpecifier;
+        parent: NamedImports;
+        propertyName?: Identifier;
+        name: Identifier;
+    }
+    interface ExportSpecifier extends NamedDeclaration {
+        kind: SyntaxKind.ExportSpecifier;
+        parent: NamedExports;
+        propertyName?: Identifier;
+        name: Identifier;
+    }
+    type ImportOrExportSpecifier = ImportSpecifier | ExportSpecifier;
+    /**
+     * This is either an `export =` or an `export default` declaration.
+     * Unless `isExportEquals` is set, this node was parsed as an `export default`.
+     */
+    interface ExportAssignment extends DeclarationStatement {
+        kind: SyntaxKind.ExportAssignment;
+        parent: SourceFile;
+        isExportEquals?: boolean;
+        expression: Expression;
+    }
+    interface FileReference extends TextRange {
+        fileName: string;
+    }
+    interface CheckJsDirective extends TextRange {
+        enabled: boolean;
+    }
+    type CommentKind = SyntaxKind.SingleLineCommentTrivia | SyntaxKind.MultiLineCommentTrivia;
+    interface CommentRange extends TextRange {
+        hasTrailingNewLine?: boolean;
+        kind: CommentKind;
+    }
+    interface SynthesizedComment extends CommentRange {
+        text: string;
+        pos: -1;
+        end: -1;
+    }
+    interface JSDocTypeExpression extends TypeNode {
+        kind: SyntaxKind.JSDocTypeExpression;
+        type: TypeNode;
+    }
+    interface JSDocType extends TypeNode {
+        _jsDocTypeBrand: any;
+    }
+    interface JSDocAllType extends JSDocType {
+        kind: SyntaxKind.JSDocAllType;
+    }
+    interface JSDocUnknownType extends JSDocType {
+        kind: SyntaxKind.JSDocUnknownType;
+    }
+    interface JSDocNonNullableType extends JSDocType {
+        kind: SyntaxKind.JSDocNonNullableType;
+        type: TypeNode;
+    }
+    interface JSDocNullableType extends JSDocType {
+        kind: SyntaxKind.JSDocNullableType;
+        type: TypeNode;
+    }
+    interface JSDocOptionalType extends JSDocType {
+        kind: SyntaxKind.JSDocOptionalType;
+        type: TypeNode;
+    }
+    interface JSDocFunctionType extends JSDocType, SignatureDeclarationBase {
+        kind: SyntaxKind.JSDocFunctionType;
+    }
+    interface JSDocVariadicType extends JSDocType {
+        kind: SyntaxKind.JSDocVariadicType;
+        type: TypeNode;
+    }
+    type JSDocTypeReferencingNode = JSDocVariadicType | JSDocOptionalType | JSDocNullableType | JSDocNonNullableType;
+    interface JSDoc extends Node {
+        kind: SyntaxKind.JSDocComment;
+        parent: HasJSDoc;
+        tags?: NodeArray<JSDocTag>;
+        comment?: string;
+    }
+    interface JSDocTag extends Node {
+        parent: JSDoc | JSDocTypeLiteral;
+        atToken: AtToken;
+        tagName: Identifier;
+        comment?: string;
+    }
+    interface JSDocUnknownTag extends JSDocTag {
+        kind: SyntaxKind.JSDocTag;
+    }
+    /**
+     * Note that `@extends` is a synonym of `@augments`.
+     * Both tags are represented by this interface.
+     */
+    interface JSDocAugmentsTag extends JSDocTag {
+        kind: SyntaxKind.JSDocAugmentsTag;
+        class: ExpressionWithTypeArguments & {
+            expression: Identifier | PropertyAccessEntityNameExpression;
+        };
+    }
+    interface JSDocClassTag extends JSDocTag {
+        kind: SyntaxKind.JSDocClassTag;
+    }
+    interface JSDocTemplateTag extends JSDocTag {
+        kind: SyntaxKind.JSDocTemplateTag;
+        typeParameters: NodeArray<TypeParameterDeclaration>;
+    }
+    interface JSDocReturnTag extends JSDocTag {
+        kind: SyntaxKind.JSDocReturnTag;
+        typeExpression?: JSDocTypeExpression;
+    }
+    interface JSDocTypeTag extends JSDocTag {
+        kind: SyntaxKind.JSDocTypeTag;
+        typeExpression?: JSDocTypeExpression;
+    }
+    interface JSDocTypedefTag extends JSDocTag, NamedDeclaration {
+        parent: JSDoc;
+        kind: SyntaxKind.JSDocTypedefTag;
+        fullName?: JSDocNamespaceDeclaration | Identifier;
+        name?: Identifier;
+        typeExpression?: JSDocTypeExpression | JSDocTypeLiteral;
+    }
+    interface JSDocCallbackTag extends JSDocTag, NamedDeclaration {
+        parent: JSDoc;
+        kind: SyntaxKind.JSDocCallbackTag;
+        fullName?: JSDocNamespaceDeclaration | Identifier;
+        name?: Identifier;
+        typeExpression: JSDocSignature;
+    }
+    interface JSDocSignature extends JSDocType, Declaration {
+        kind: SyntaxKind.JSDocSignature;
+        typeParameters?: ReadonlyArray<JSDocTemplateTag>;
+        parameters: ReadonlyArray<JSDocParameterTag>;
+        type: JSDocReturnTag | undefined;
+    }
+    interface JSDocPropertyLikeTag extends JSDocTag, Declaration {
+        parent: JSDoc;
+        name: EntityName;
+        typeExpression?: JSDocTypeExpression;
+        /** Whether the property name came before the type -- non-standard for JSDoc, but Typescript-like */
+        isNameFirst: boolean;
+        isBracketed: boolean;
+    }
+    interface JSDocPropertyTag extends JSDocPropertyLikeTag {
+        kind: SyntaxKind.JSDocPropertyTag;
+    }
+    interface JSDocParameterTag extends JSDocPropertyLikeTag {
+        kind: SyntaxKind.JSDocParameterTag;
+    }
+    interface JSDocTypeLiteral extends JSDocType {
+        kind: SyntaxKind.JSDocTypeLiteral;
+        jsDocPropertyTags?: ReadonlyArray<JSDocPropertyLikeTag>;
+        /** If true, then this type literal represents an *array* of its type. */
+        isArrayType?: boolean;
+    }
+    enum FlowFlags {
+        Unreachable = 1,
+        Start = 2,
+        BranchLabel = 4,
+        LoopLabel = 8,
+        Assignment = 16,
+        TrueCondition = 32,
+        FalseCondition = 64,
+        SwitchClause = 128,
+        ArrayMutation = 256,
+        Referenced = 512,
+        Shared = 1024,
+        PreFinally = 2048,
+        AfterFinally = 4096,
+        Label = 12,
+        Condition = 96
+    }
+    interface FlowLock {
+        locked?: boolean;
+    }
+    interface AfterFinallyFlow extends FlowNodeBase, FlowLock {
+        antecedent: FlowNode;
+    }
+    interface PreFinallyFlow extends FlowNodeBase {
+        antecedent: FlowNode;
+        lock: FlowLock;
+    }
+    type FlowNode = AfterFinallyFlow | PreFinallyFlow | FlowStart | FlowLabel | FlowAssignment | FlowCondition | FlowSwitchClause | FlowArrayMutation;
+    interface FlowNodeBase {
+        flags: FlowFlags;
+        id?: number;
+    }
+    interface FlowStart extends FlowNodeBase {
+        container?: FunctionExpression | ArrowFunction | MethodDeclaration;
+    }
+    interface FlowLabel extends FlowNodeBase {
+        antecedents: FlowNode[] | undefined;
+    }
+    interface FlowAssignment extends FlowNodeBase {
+        node: Expression | VariableDeclaration | BindingElement;
+        antecedent: FlowNode;
+    }
+    interface FlowCondition extends FlowNodeBase {
+        expression: Expression;
+        antecedent: FlowNode;
+    }
+    interface FlowSwitchClause extends FlowNodeBase {
+        switchStatement: SwitchStatement;
+        clauseStart: number;
+        clauseEnd: number;
+        antecedent: FlowNode;
+    }
+    interface FlowArrayMutation extends FlowNodeBase {
+        node: CallExpression | BinaryExpression;
+        antecedent: FlowNode;
+    }
+    type FlowType = Type | IncompleteType;
+    interface IncompleteType {
+        flags: TypeFlags;
+        type: Type;
+    }
+    interface AmdDependency {
+        path: string;
+        name?: string;
+    }
+    /**
+     * Subset of properties from SourceFile that are used in multiple utility functions
+     */
+    interface SourceFileLike {
+        readonly text: string;
+        lineMap?: ReadonlyArray<number>;
+    }
+    interface RedirectInfo {
+        /** Source file this redirects to. */
+        readonly redirectTarget: SourceFile;
+        /**
+         * Source file for the duplicate package. This will not be used by the Program,
+         * but we need to keep this around so we can watch for changes in underlying.
+         */
+        readonly unredirected: SourceFile;
+    }
+    interface SourceFile extends Declaration {
+        kind: SyntaxKind.SourceFile;
+        statements: NodeArray<Statement>;
+        endOfFileToken: Token<SyntaxKind.EndOfFileToken>;
+        fileName: string;
+        path: Path;
+        text: string;
+        resolvedPath: Path;
+        /**
+         * If two source files are for the same version of the same package, one will redirect to the other.
+         * (See `createRedirectSourceFile` in program.ts.)
+         * The redirect will have this set. The redirected-to source file will be in `redirectTargetsSet`.
+         */
+        redirectInfo?: RedirectInfo;
+        amdDependencies: ReadonlyArray<AmdDependency>;
+        moduleName?: string;
+        referencedFiles: ReadonlyArray<FileReference>;
+        typeReferenceDirectives: ReadonlyArray<FileReference>;
+        libReferenceDirectives: ReadonlyArray<FileReference>;
+        languageVariant: LanguageVariant;
+        isDeclarationFile: boolean;
+        renamedDependencies?: ReadonlyMap<string>;
+        /**
+         * lib.d.ts should have a reference comment like
+         *
+         *  /// <reference no-default-lib="true"/>
+         *
+         * If any other file has this comment, it signals not to include lib.d.ts
+         * because this containing file is intended to act as a default library.
+         */
+        hasNoDefaultLib: boolean;
+        languageVersion: ScriptTarget;
+        scriptKind: ScriptKind;
+        /**
+         * The first "most obvious" node that makes a file an external module.
+         * This is intended to be the first top-level import/export,
+         * but could be arbitrarily nested (e.g. `import.meta`).
+         */
+        externalModuleIndicator?: Node;
+        commonJsModuleIndicator?: Node;
+        identifiers: Map<string>;
+        nodeCount: number;
+        identifierCount: number;
+        symbolCount: number;
+        parseDiagnostics: DiagnosticWithLocation[];
+        bindDiagnostics: DiagnosticWithLocation[];
+        bindSuggestionDiagnostics?: DiagnosticWithLocation[];
+        jsDocDiagnostics?: DiagnosticWithLocation[];
+        additionalSyntacticDiagnostics?: ReadonlyArray<DiagnosticWithLocation>;
+        lineMap: ReadonlyArray<number>;
+        classifiableNames?: ReadonlyUnderscoreEscapedMap<true>;
+        resolvedModules?: Map<ResolvedModuleFull | undefined>;
+        resolvedTypeReferenceDirectiveNames: Map<ResolvedTypeReferenceDirective>;
+        imports: ReadonlyArray<StringLiteralLike>;
+        /**
+         * When a file's references are redirected due to project reference directives,
+         * the original names of the references are stored in this array
+         */
+        redirectedReferences?: ReadonlyArray<string>;
+        moduleAugmentations: ReadonlyArray<StringLiteral | Identifier>;
+        patternAmbientModules?: PatternAmbientModule[];
+        ambientModuleNames: ReadonlyArray<string>;
+        checkJsDirective?: CheckJsDirective;
+        version: string;
+        pragmas: PragmaMap;
+        localJsxNamespace?: __String;
+        localJsxFactory?: EntityName;
+    }
+    interface Bundle extends Node {
+        kind: SyntaxKind.Bundle;
+        prepends: ReadonlyArray<InputFiles | UnparsedSource>;
+        sourceFiles: ReadonlyArray<SourceFile>;
+        syntheticFileReferences?: ReadonlyArray<FileReference>;
+        syntheticTypeReferences?: ReadonlyArray<FileReference>;
+        hasNoDefaultLib?: boolean;
+    }
+    interface InputFiles extends Node {
+        kind: SyntaxKind.InputFiles;
+        javascriptText: string;
+        javascriptMapText?: string;
+        declarationText: string;
+        declarationMapText?: string;
+    }
+    interface UnparsedSource extends Node {
+        kind: SyntaxKind.UnparsedSource;
+        text: string;
+        sourceMapText?: string;
+    }
+    interface JsonSourceFile extends SourceFile {
+        statements: NodeArray<JsonObjectExpressionStatement>;
+    }
+    interface TsConfigSourceFile extends JsonSourceFile {
+        extendedSourceFiles?: string[];
+    }
+    interface JsonMinusNumericLiteral extends PrefixUnaryExpression {
+        kind: SyntaxKind.PrefixUnaryExpression;
+        operator: SyntaxKind.MinusToken;
+        operand: NumericLiteral;
+    }
+    interface JsonObjectExpressionStatement extends ExpressionStatement {
+        expression: ObjectLiteralExpression | ArrayLiteralExpression | JsonMinusNumericLiteral | NumericLiteral | StringLiteral | BooleanLiteral | NullLiteral;
+    }
+    interface ScriptReferenceHost {
+        getCompilerOptions(): CompilerOptions;
+        getSourceFile(fileName: string): SourceFile | undefined;
+        getSourceFileByPath(path: Path): SourceFile | undefined;
+        getCurrentDirectory(): string;
+    }
+    interface ParseConfigHost {
+        useCaseSensitiveFileNames: boolean;
+        readDirectory(rootDir: string, extensions: ReadonlyArray<string>, excludes: ReadonlyArray<string> | undefined, includes: ReadonlyArray<string>, depth?: number): string[];
+        /**
+         * Gets a value indicating whether the specified path exists and is a file.
+         * @param path The path to test.
+         */
+        fileExists(path: string): boolean;
+        readFile(path: string): string | undefined;
+    }
+    type WriteFileCallback = (fileName: string, data: string, writeByteOrderMark: boolean, onError: ((message: string) => void) | undefined, sourceFiles?: ReadonlyArray<SourceFile>) => void;
+    class OperationCanceledException {
+    }
+    interface CancellationToken {
+        isCancellationRequested(): boolean;
+        /** @throws OperationCanceledException if isCancellationRequested is true */
+        throwIfCancellationRequested(): void;
+    }
+    interface Program extends ScriptReferenceHost {
+        /**
+         * Get a list of root file names that were passed to a 'createProgram'
+         */
+        getRootFileNames(): ReadonlyArray<string>;
+        /**
+         * Get a list of files in the program
+         */
+        getSourceFiles(): ReadonlyArray<SourceFile>;
+        /**
+         * Get a list of file names that were passed to 'createProgram' or referenced in a
+         * program source file but could not be located.
+         */
+        getMissingFilePaths(): ReadonlyArray<Path>;
+        /**
+         * Emits the JavaScript and declaration files.  If targetSourceFile is not specified, then
+         * the JavaScript and declaration files will be produced for all the files in this program.
+         * If targetSourceFile is specified, then only the JavaScript and declaration for that
+         * specific file will be generated.
+         *
+         * If writeFile is not specified then the writeFile callback from the compiler host will be
+         * used for writing the JavaScript and declaration files.  Otherwise, the writeFile parameter
+         * will be invoked when writing the JavaScript and declaration files.
+         */
+        emit(targetSourceFile?: SourceFile, writeFile?: WriteFileCallback, cancellationToken?: CancellationToken, emitOnlyDtsFiles?: boolean, customTransformers?: CustomTransformers): EmitResult;
+        getOptionsDiagnostics(cancellationToken?: CancellationToken): ReadonlyArray<Diagnostic>;
+        getGlobalDiagnostics(cancellationToken?: CancellationToken): ReadonlyArray<Diagnostic>;
+        getSyntacticDiagnostics(sourceFile?: SourceFile, cancellationToken?: CancellationToken): ReadonlyArray<DiagnosticWithLocation>;
+        /** The first time this is called, it will return global diagnostics (no location). */
+        getSemanticDiagnostics(sourceFile?: SourceFile, cancellationToken?: CancellationToken): ReadonlyArray<Diagnostic>;
+        getDeclarationDiagnostics(sourceFile?: SourceFile, cancellationToken?: CancellationToken): ReadonlyArray<DiagnosticWithLocation>;
+        getConfigFileParsingDiagnostics(): ReadonlyArray<Diagnostic>;
+        getSuggestionDiagnostics(sourceFile: SourceFile, cancellationToken?: CancellationToken): ReadonlyArray<DiagnosticWithLocation>;
+        /**
+         * Gets a type checker that can be used to semantically analyze source files in the program.
+         */
+        getTypeChecker(): TypeChecker;
+        getCommonSourceDirectory(): string;
+        getDiagnosticsProducingTypeChecker(): TypeChecker;
+        dropDiagnosticsProducingTypeChecker(): void;
+        getClassifiableNames(): UnderscoreEscapedMap<true>;
+        getNodeCount(): number;
+        getIdentifierCount(): number;
+        getSymbolCount(): number;
+        getTypeCount(): number;
+        getFileProcessingDiagnostics(): DiagnosticCollection;
+        getResolvedTypeReferenceDirectives(): Map<ResolvedTypeReferenceDirective>;
+        isSourceFileFromExternalLibrary(file: SourceFile): boolean;
+        isSourceFileDefaultLibrary(file: SourceFile): boolean;
+        structureIsReused?: StructureIsReused;
+        getSourceFileFromReference(referencingFile: SourceFile, ref: FileReference): SourceFile | undefined;
+        getLibFileFromReference(ref: FileReference): SourceFile | undefined;
+        /** Given a source file, get the name of the package it was imported from. */
+        sourceFileToPackageName: Map<string>;
+        /** Set of all source files that some other source file redirects to. */
+        redirectTargetsSet: Map<true>;
+        /** Is the file emitted file */
+        isEmittedFile(file: string): boolean;
+        getResolvedModuleWithFailedLookupLocationsFromCache(moduleName: string, containingFile: string): ResolvedModuleWithFailedLookupLocations | undefined;
+        getProjectReferences(): (ResolvedProjectReference | undefined)[] | undefined;
+    }
+    interface ResolvedProjectReference {
+        commandLine: ParsedCommandLine;
+        sourceFile: SourceFile;
+    }
+    enum StructureIsReused {
+        Not = 0,
+        SafeModules = 1,
+        Completely = 2
+    }
+    interface CustomTransformers {
+        /** Custom transformers to evaluate before built-in .js transformations. */
+        before?: TransformerFactory<SourceFile>[];
+        /** Custom transformers to evaluate after built-in .js transformations. */
+        after?: TransformerFactory<SourceFile>[];
+        /** Custom transformers to evaluate after built-in .d.ts transformations. */
+        afterDeclarations?: TransformerFactory<Bundle | SourceFile>[];
+    }
+    interface SourceMapSpan {
+        /** Line number in the .js file. */
+        emittedLine: number;
+        /** Column number in the .js file. */
+        emittedColumn: number;
+        /** Line number in the .ts file. */
+        sourceLine: number;
+        /** Column number in the .ts file. */
+        sourceColumn: number;
+        /** Optional name (index into names array) associated with this span. */
+        nameIndex?: number;
+        /** .ts file (index into sources array) associated with this span */
+        sourceIndex: number;
+    }
+    interface SourceMapData {
+        sourceMapFilePath: string;
+        jsSourceMappingURL: string;
+        sourceMapFile: string;
+        sourceMapSourceRoot: string;
+        sourceMapSources: string[];
+        sourceMapSourcesContent?: string[];
+        inputSourceFileNames: string[];
+        sourceMapNames?: string[];
+        sourceMapMappings: string;
+        sourceMapDecodedMappings: SourceMapSpan[];
+    }
+    /** Return code used by getEmitOutput function to indicate status of the function */
+    enum ExitStatus {
+        Success = 0,
+        DiagnosticsPresent_OutputsSkipped = 1,
+        DiagnosticsPresent_OutputsGenerated = 2
+    }
+    interface EmitResult {
+        emitSkipped: boolean;
+        /** Contains declaration emit diagnostics */
+        diagnostics: ReadonlyArray<Diagnostic>;
+        emittedFiles?: string[];
+        sourceMaps?: SourceMapData[];
+    }
+    interface TypeCheckerHost {
+        getCompilerOptions(): CompilerOptions;
+        getSourceFiles(): ReadonlyArray<SourceFile>;
+        getSourceFile(fileName: string): SourceFile | undefined;
+        getResolvedTypeReferenceDirectives(): ReadonlyMap<ResolvedTypeReferenceDirective>;
+    }
+    interface TypeChecker {
+        getTypeOfSymbolAtLocation(symbol: Symbol, node: Node): Type;
+        getDeclaredTypeOfSymbol(symbol: Symbol): Type;
+        getPropertiesOfType(type: Type): Symbol[];
+        getPropertyOfType(type: Type, propertyName: string): Symbol | undefined;
+        getIndexInfoOfType(type: Type, kind: IndexKind): IndexInfo | undefined;
+        getSignaturesOfType(type: Type, kind: SignatureKind): Signature[];
+        getIndexTypeOfType(type: Type, kind: IndexKind): Type | undefined;
+        getBaseTypes(type: InterfaceType): BaseType[];
+        getBaseTypeOfLiteralType(type: Type): Type;
+        getWidenedType(type: Type): Type;
+        getReturnTypeOfSignature(signature: Signature): Type;
+        /**
+         * Gets the type of a parameter at a given position in a signature.
+         * Returns `any` if the index is not valid.
+         */
+        getParameterType(signature: Signature, parameterIndex: number): Type;
+        getNullableType(type: Type, flags: TypeFlags): Type;
+        getNonNullableType(type: Type): Type;
+        /** Note that the resulting nodes cannot be checked. */
+        typeToTypeNode(type: Type, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): TypeNode | undefined;
+        typeToTypeNode(type: Type, enclosingDeclaration?: Node, flags?: NodeBuilderFlags, tracker?: SymbolTracker): TypeNode | undefined;
+        /** Note that the resulting nodes cannot be checked. */
+        signatureToSignatureDeclaration(signature: Signature, kind: SyntaxKind, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): (SignatureDeclaration & {
+            typeArguments?: NodeArray<TypeNode>;
+        }) | undefined;
+        /** Note that the resulting nodes cannot be checked. */
+        indexInfoToIndexSignatureDeclaration(indexInfo: IndexInfo, kind: IndexKind, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): IndexSignatureDeclaration | undefined;
+        /** Note that the resulting nodes cannot be checked. */
+        symbolToEntityName(symbol: Symbol, meaning: SymbolFlags, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): EntityName | undefined;
+        /** Note that the resulting nodes cannot be checked. */
+        symbolToExpression(symbol: Symbol, meaning: SymbolFlags, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): Expression | undefined;
+        /** Note that the resulting nodes cannot be checked. */
+        symbolToTypeParameterDeclarations(symbol: Symbol, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): NodeArray<TypeParameterDeclaration> | undefined;
+        /** Note that the resulting nodes cannot be checked. */
+        symbolToParameterDeclaration(symbol: Symbol, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): ParameterDeclaration | undefined;
+        /** Note that the resulting nodes cannot be checked. */
+        typeParameterToDeclaration(parameter: TypeParameter, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): TypeParameterDeclaration | undefined;
+        getSymbolsInScope(location: Node, meaning: SymbolFlags): Symbol[];
+        getSymbolAtLocation(node: Node): Symbol | undefined;
+        getSymbolsOfParameterPropertyDeclaration(parameter: ParameterDeclaration, parameterName: string): Symbol[];
+        /**
+         * The function returns the value (local variable) symbol of an identifier in the short-hand property assignment.
+         * This is necessary as an identifier in short-hand property assignment can contains two meaning: property name and property value.
+         */
+        getShorthandAssignmentValueSymbol(location: Node): Symbol | undefined;
+        getExportSpecifierLocalTargetSymbol(location: ExportSpecifier): Symbol | undefined;
+        /**
+         * If a symbol is a local symbol with an associated exported symbol, returns the exported symbol.
+         * Otherwise returns its input.
+         * For example, at `export type T = number;`:
+         *     - `getSymbolAtLocation` at the location `T` will return the exported symbol for `T`.
+         *     - But the result of `getSymbolsInScope` will contain the *local* symbol for `T`, not the exported symbol.
+         *     - Calling `getExportSymbolOfSymbol` on that local symbol will return the exported symbol.
+         */
+        getExportSymbolOfSymbol(symbol: Symbol): Symbol;
+        getPropertySymbolOfDestructuringAssignment(location: Identifier): Symbol | undefined;
+        getTypeAtLocation(node: Node): Type | undefined;
+        getTypeFromTypeNode(node: TypeNode): Type;
+        signatureToString(signature: Signature, enclosingDeclaration?: Node, flags?: TypeFormatFlags, kind?: SignatureKind): string;
+        typeToString(type: Type, enclosingDeclaration?: Node, flags?: TypeFormatFlags): string;
+        symbolToString(symbol: Symbol, enclosingDeclaration?: Node, meaning?: SymbolFlags, flags?: SymbolFormatFlags): string;
+        typePredicateToString(predicate: TypePredicate, enclosingDeclaration?: Node, flags?: TypeFormatFlags): string;
+        writeSignature(signature: Signature, enclosingDeclaration?: Node, flags?: TypeFormatFlags, kind?: SignatureKind, writer?: EmitTextWriter): string;
+        writeType(type: Type, enclosingDeclaration?: Node, flags?: TypeFormatFlags, writer?: EmitTextWriter): string;
+        writeSymbol(symbol: Symbol, enclosingDeclaration?: Node, meaning?: SymbolFlags, flags?: SymbolFormatFlags, writer?: EmitTextWriter): string;
+        writeTypePredicate(predicate: TypePredicate, enclosingDeclaration?: Node, flags?: TypeFormatFlags, writer?: EmitTextWriter): string;
+        /**
+         * @deprecated Use the createX factory functions or XToY typechecker methods and `createPrinter` or the `xToString` methods instead
+         * This will be removed in a future version.
+         */
+        getSymbolDisplayBuilder(): SymbolDisplayBuilder;
+        getFullyQualifiedName(symbol: Symbol): string;
+        getAugmentedPropertiesOfType(type: Type): Symbol[];
+        getRootSymbols(symbol: Symbol): Symbol[];
+        getContextualType(node: Expression): Type | undefined;
+        getContextualTypeForArgumentAtIndex(call: CallLikeExpression, argIndex: number): Type | undefined;
+        getContextualTypeForJsxAttribute(attribute: JsxAttribute | JsxSpreadAttribute): Type | undefined;
+        isContextSensitive(node: Expression | MethodDeclaration | ObjectLiteralElementLike | JsxAttributeLike): boolean;
+        /**
+         * returns unknownSignature in the case of an error.
+         * returns undefined if the node is not valid.
+         * @param argumentCount Apparent number of arguments, passed in case of a possibly incomplete call. This should come from an ArgumentListInfo. See `signatureHelp.ts`.
+         */
+        getResolvedSignature(node: CallLikeExpression, candidatesOutArray?: Signature[], argumentCount?: number): Signature | undefined;
+        getSignatureFromDeclaration(declaration: SignatureDeclaration): Signature | undefined;
+        isImplementationOfOverload(node: SignatureDeclaration): boolean | undefined;
+        isUndefinedSymbol(symbol: Symbol): boolean;
+        isArgumentsSymbol(symbol: Symbol): boolean;
+        isUnknownSymbol(symbol: Symbol): boolean;
+        getMergedSymbol(symbol: Symbol): Symbol;
+        getConstantValue(node: EnumMember | PropertyAccessExpression | ElementAccessExpression): string | number | undefined;
+        isValidPropertyAccess(node: PropertyAccessExpression | QualifiedName | ImportTypeNode, propertyName: string): boolean;
+        /** Exclude accesses to private properties or methods with a `this` parameter that `type` doesn't satisfy. */
+        isValidPropertyAccessForCompletions(node: PropertyAccessExpression | ImportTypeNode, type: Type, property: Symbol): boolean;
+        /** Follow all aliases to get the original symbol. */
+        getAliasedSymbol(symbol: Symbol): Symbol;
+        /** Follow a *single* alias to get the immediately aliased symbol. */
+        getImmediateAliasedSymbol(symbol: Symbol): Symbol | undefined;
+        getExportsOfModule(moduleSymbol: Symbol): Symbol[];
+        /** Unlike `getExportsOfModule`, this includes properties of an `export =` value. */
+        getExportsAndPropertiesOfModule(moduleSymbol: Symbol): Symbol[];
+        getAllAttributesTypeFromJsxOpeningLikeElement(elementNode: JsxOpeningLikeElement): Type | undefined;
+        getJsxIntrinsicTagNamesAt(location: Node): Symbol[];
+        isOptionalParameter(node: ParameterDeclaration): boolean;
+        getAmbientModules(): Symbol[];
+        tryGetMemberInModuleExports(memberName: string, moduleSymbol: Symbol): Symbol | undefined;
+        /**
+         * Unlike `tryGetMemberInModuleExports`, this includes properties of an `export =` value.
+         * Does *not* return properties of primitive types.
+         */
+        tryGetMemberInModuleExportsAndProperties(memberName: string, moduleSymbol: Symbol): Symbol | undefined;
+        getApparentType(type: Type): Type;
+        getSuggestionForNonexistentProperty(node: Identifier, containingType: Type): string | undefined;
+        getSuggestionForNonexistentSymbol(location: Node, name: string, meaning: SymbolFlags): string | undefined;
+        getSuggestionForNonexistentModule(node: Identifier, target: Symbol): string | undefined;
+        getBaseConstraintOfType(type: Type): Type | undefined;
+        getDefaultFromTypeParameter(type: Type): Type | undefined;
+        getAnyType(): Type;
+        getStringType(): Type;
+        getNumberType(): Type;
+        getBooleanType(): Type;
+        getFalseType(): Type;
+        getTrueType(): Type;
+        getVoidType(): Type;
+        getUndefinedType(): Type;
+        getNullType(): Type;
+        getESSymbolType(): Type;
+        getNeverType(): Type;
+        getUnionType(types: Type[], subtypeReduction?: UnionReduction): Type;
+        createArrayType(elementType: Type): Type;
+        createPromiseType(type: Type): Type;
+        createAnonymousType(symbol: Symbol, members: SymbolTable, callSignatures: Signature[], constructSignatures: Signature[], stringIndexInfo: IndexInfo | undefined, numberIndexInfo: IndexInfo | undefined): Type;
+        createSignature(declaration: SignatureDeclaration, typeParameters: TypeParameter[] | undefined, thisParameter: Symbol | undefined, parameters: Symbol[], resolvedReturnType: Type, typePredicate: TypePredicate | undefined, minArgumentCount: number, hasRestParameter: boolean, hasLiteralTypes: boolean): Signature;
+        createSymbol(flags: SymbolFlags, name: __String): TransientSymbol;
+        createIndexInfo(type: Type, isReadonly: boolean, declaration?: SignatureDeclaration): IndexInfo;
+        isSymbolAccessible(symbol: Symbol, enclosingDeclaration: Node | undefined, meaning: SymbolFlags, shouldComputeAliasToMarkVisible: boolean): SymbolAccessibilityResult;
+        tryFindAmbientModuleWithoutAugmentations(moduleName: string): Symbol | undefined;
+        getSymbolWalker(accept?: (symbol: Symbol) => boolean): SymbolWalker;
+        getDiagnostics(sourceFile?: SourceFile, cancellationToken?: CancellationToken): Diagnostic[];
+        getGlobalDiagnostics(): Diagnostic[];
+        getEmitResolver(sourceFile?: SourceFile, cancellationToken?: CancellationToken): EmitResolver;
+        getNodeCount(): number;
+        getIdentifierCount(): number;
+        getSymbolCount(): number;
+        getTypeCount(): number;
+        isArrayLikeType(type: Type): boolean;
+        /**
+         * For a union, will include a property if it's defined in *any* of the member types.
+         * So for `{ a } | { b }`, this will include both `a` and `b`.
+         * Does not include properties of primitive types.
+         */
+        getAllPossiblePropertiesOfTypes(type: ReadonlyArray<Type>): Symbol[];
+        resolveName(name: string, location: Node, meaning: SymbolFlags, excludeGlobals: boolean): Symbol | undefined;
+        getJsxNamespace(location?: Node): string;
+        /**
+         * Note that this will return undefined in the following case:
+         *     // a.ts
+         *     export namespace N { export class C { } }
+         *     // b.ts
+         *     <<enclosingDeclaration>>
+         * Where `C` is the symbol we're looking for.
+         * This should be called in a loop climbing parents of the symbol, so we'll get `N`.
+         */
+        getAccessibleSymbolChain(symbol: Symbol, enclosingDeclaration: Node | undefined, meaning: SymbolFlags, useOnlyExternalAliasing: boolean): Symbol[] | undefined;
+        getTypePredicateOfSignature(signature: Signature): TypePredicate;
+        resolveExternalModuleSymbol(symbol: Symbol): Symbol;
+        /** @param node A location where we might consider accessing `this`. Not necessarily a ThisExpression. */
+        tryGetThisTypeAt(node: Node): Type | undefined;
+        getTypeArgumentConstraint(node: TypeNode): Type | undefined;
+        /**
+         * Does *not* get *all* suggestion diagnostics, just the ones that were convenient to report in the checker.
+         * Others are added in computeSuggestionDiagnostics.
+         */
+        getSuggestionDiagnostics(file: SourceFile, cancellationToken?: CancellationToken): ReadonlyArray<DiagnosticWithLocation>;
+        /**
+         * Depending on the operation performed, it may be appropriate to throw away the checker
+         * if the cancellation token is triggered. Typically, if it is used for error checking
+         * and the operation is cancelled, then it should be discarded, otherwise it is safe to keep.
+         */
+        runWithCancellationToken<T>(token: CancellationToken, cb: (checker: TypeChecker) => T): T;
+    }
+    enum UnionReduction {
+        None = 0,
+        Literal = 1,
+        Subtype = 2
+    }
+    enum NodeBuilderFlags {
+        None = 0,
+        NoTruncation = 1,
+        WriteArrayAsGenericType = 2,
+        GenerateNamesForShadowedTypeParams = 4,
+        UseStructuralFallback = 8,
+        ForbidIndexedAccessSymbolReferences = 16,
+        WriteTypeArgumentsOfSignature = 32,
+        UseFullyQualifiedType = 64,
+        UseOnlyExternalAliasing = 128,
+        SuppressAnyReturnType = 256,
+        WriteTypeParametersInQualifiedName = 512,
+        MultilineObjectLiterals = 1024,
+        WriteClassExpressionAsTypeLiteral = 2048,
+        UseTypeOfFunction = 4096,
+        OmitParameterModifiers = 8192,
+        UseAliasDefinedOutsideCurrentScope = 16384,
+        AllowThisInObjectLiteral = 32768,
+        AllowQualifedNameInPlaceOfIdentifier = 65536,
+        AllowAnonymousIdentifier = 131072,
+        AllowEmptyUnionOrIntersection = 262144,
+        AllowEmptyTuple = 524288,
+        AllowUniqueESSymbolType = 1048576,
+        AllowEmptyIndexInfoType = 2097152,
+        IgnoreErrors = 3112960,
+        InObjectTypeLiteral = 4194304,
+        InTypeAlias = 8388608,
+        InInitialEntityName = 16777216,
+        InReverseMappedType = 33554432
+    }
+    enum TypeFormatFlags {
+        None = 0,
+        NoTruncation = 1,
+        WriteArrayAsGenericType = 2,
+        UseStructuralFallback = 8,
+        WriteTypeArgumentsOfSignature = 32,
+        UseFullyQualifiedType = 64,
+        SuppressAnyReturnType = 256,
+        MultilineObjectLiterals = 1024,
+        WriteClassExpressionAsTypeLiteral = 2048,
+        UseTypeOfFunction = 4096,
+        OmitParameterModifiers = 8192,
+        UseAliasDefinedOutsideCurrentScope = 16384,
+        AllowUniqueESSymbolType = 1048576,
+        AddUndefined = 131072,
+        WriteArrowStyleSignature = 262144,
+        InArrayType = 524288,
+        InElementType = 2097152,
+        InFirstTypeArgument = 4194304,
+        InTypeAlias = 8388608,
+        /** @deprecated */ WriteOwnNameForAnyLike = 0,
+        NodeBuilderFlagsMask = 9469291
+    }
+    enum SymbolFormatFlags {
+        None = 0,
+        WriteTypeParametersOrArguments = 1,
+        UseOnlyExternalAliasing = 2,
+        AllowAnyNodeKind = 4,
+        UseAliasDefinedOutsideCurrentScope = 8
+    }
+    interface SymbolWalker {
+        /** Note: Return values are not ordered. */
+        walkType(root: Type): {
+            visitedTypes: ReadonlyArray<Type>;
+            visitedSymbols: ReadonlyArray<Symbol>;
+        };
+        /** Note: Return values are not ordered. */
+        walkSymbol(root: Symbol): {
+            visitedTypes: ReadonlyArray<Type>;
+            visitedSymbols: ReadonlyArray<Symbol>;
+        };
+    }
+    /**
+     * @deprecated
+     */
+    interface SymbolDisplayBuilder {
+        /** @deprecated */ buildTypeDisplay(type: Type, writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags): void;
+        /** @deprecated */ buildSymbolDisplay(symbol: Symbol, writer: SymbolWriter, enclosingDeclaration?: Node, meaning?: SymbolFlags, flags?: SymbolFormatFlags): void;
+        /** @deprecated */ buildSignatureDisplay(signature: Signature, writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags, kind?: SignatureKind): void;
+        /** @deprecated */ buildIndexSignatureDisplay(info: IndexInfo, writer: SymbolWriter, kind: IndexKind, enclosingDeclaration?: Node, globalFlags?: TypeFormatFlags, symbolStack?: Symbol[]): void;
+        /** @deprecated */ buildParameterDisplay(parameter: Symbol, writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags): void;
+        /** @deprecated */ buildTypeParameterDisplay(tp: TypeParameter, writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags): void;
+        /** @deprecated */ buildTypePredicateDisplay(predicate: TypePredicate, writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags): void;
+        /** @deprecated */ buildTypeParameterDisplayFromSymbol(symbol: Symbol, writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags): void;
+        /** @deprecated */ buildDisplayForParametersAndDelimiters(thisParameter: Symbol, parameters: Symbol[], writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags): void;
+        /** @deprecated */ buildDisplayForTypeParametersAndDelimiters(typeParameters: TypeParameter[], writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags): void;
+        /** @deprecated */ buildReturnTypeDisplay(signature: Signature, writer: SymbolWriter, enclosingDeclaration?: Node, flags?: TypeFormatFlags): void;
+    }
+    /**
+     * @deprecated Migrate to other methods of generating symbol names, ex symbolToEntityName + a printer or symbolToString
+     */
+    interface SymbolWriter extends SymbolTracker {
+        writeKeyword(text: string): void;
+        writeOperator(text: string): void;
+        writePunctuation(text: string): void;
+        writeSpace(text: string): void;
+        writeStringLiteral(text: string): void;
+        writeParameter(text: string): void;
+        writeProperty(text: string): void;
+        writeSymbol(text: string, symbol: Symbol): void;
+        writeLine(): void;
+        increaseIndent(): void;
+        decreaseIndent(): void;
+        clear(): void;
+    }
+    enum SymbolAccessibility {
+        Accessible = 0,
+        NotAccessible = 1,
+        CannotBeNamed = 2
+    }
+    enum SyntheticSymbolKind {
+        UnionOrIntersection = 0,
+        Spread = 1
+    }
+    enum TypePredicateKind {
+        This = 0,
+        Identifier = 1
+    }
+    interface TypePredicateBase {
+        kind: TypePredicateKind;
+        type: Type;
+    }
+    interface ThisTypePredicate extends TypePredicateBase {
+        kind: TypePredicateKind.This;
+    }
+    interface IdentifierTypePredicate extends TypePredicateBase {
+        kind: TypePredicateKind.Identifier;
+        parameterName: string;
+        parameterIndex: number;
+    }
+    type TypePredicate = IdentifierTypePredicate | ThisTypePredicate;
+    type AnyImportSyntax = ImportDeclaration | ImportEqualsDeclaration;
+    type AnyImportOrReExport = AnyImportSyntax | ExportDeclaration;
+    interface ValidImportTypeNode extends ImportTypeNode {
+        argument: LiteralTypeNode & {
+            literal: StringLiteral;
+        };
+    }
+    type AnyValidImportOrReExport = (ImportDeclaration | ExportDeclaration) & {
+        moduleSpecifier: StringLiteral;
+    } | ImportEqualsDeclaration & {
+        moduleReference: ExternalModuleReference & {
+            expression: StringLiteral;
+        };
+    } | RequireOrImportCall | ValidImportTypeNode;
+    type RequireOrImportCall = CallExpression & {
+        arguments: [StringLiteralLike];
+    };
+    type LateVisibilityPaintedStatement = AnyImportSyntax | VariableStatement | ClassDeclaration | FunctionDeclaration | ModuleDeclaration | TypeAliasDeclaration | InterfaceDeclaration | EnumDeclaration;
+    interface SymbolVisibilityResult {
+        accessibility: SymbolAccessibility;
+        aliasesToMakeVisible?: LateVisibilityPaintedStatement[];
+        errorSymbolName?: string;
+        errorNode?: Node;
+    }
+    interface SymbolAccessibilityResult extends SymbolVisibilityResult {
+        errorModuleName?: string;
+    }
+    interface AllAccessorDeclarations {
+        firstAccessor: AccessorDeclaration;
+        secondAccessor: AccessorDeclaration | undefined;
+        getAccessor: AccessorDeclaration | undefined;
+        setAccessor: AccessorDeclaration | undefined;
+    }
+    /** Indicates how to serialize the name for a TypeReferenceNode when emitting decorator metadata */
+    enum TypeReferenceSerializationKind {
+        Unknown = 0,
+        TypeWithConstructSignatureAndValue = 1,
+        VoidNullableOrNeverType = 2,
+        NumberLikeType = 3,
+        StringLikeType = 4,
+        BooleanType = 5,
+        ArrayLikeType = 6,
+        ESSymbolType = 7,
+        Promise = 8,
+        TypeWithCallSignature = 9,
+        ObjectType = 10
+    }
+    interface EmitResolver {
+        hasGlobalName(name: string): boolean;
+        getReferencedExportContainer(node: Identifier, prefixLocals?: boolean): SourceFile | ModuleDeclaration | EnumDeclaration | undefined;
+        getReferencedImportDeclaration(node: Identifier): Declaration | undefined;
+        getReferencedDeclarationWithCollidingName(node: Identifier): Declaration | undefined;
+        isDeclarationWithCollidingName(node: Declaration): boolean;
+        isValueAliasDeclaration(node: Node): boolean;
+        isReferencedAliasDeclaration(node: Node, checkChildren?: boolean): boolean;
+        isTopLevelValueImportEqualsWithEntityName(node: ImportEqualsDeclaration): boolean;
+        getNodeCheckFlags(node: Node): NodeCheckFlags;
+        isDeclarationVisible(node: Declaration | AnyImportSyntax): boolean;
+        isLateBound(node: Declaration): node is LateBoundDeclaration;
+        collectLinkedAliases(node: Identifier): Node[] | undefined;
+        isImplementationOfOverload(node: FunctionLike): boolean | undefined;
+        isRequiredInitializedParameter(node: ParameterDeclaration): boolean;
+        isOptionalUninitializedParameterProperty(node: ParameterDeclaration): boolean;
+        createTypeOfDeclaration(declaration: AccessorDeclaration | VariableLikeDeclaration, enclosingDeclaration: Node, flags: NodeBuilderFlags, tracker: SymbolTracker, addUndefined?: boolean): TypeNode | undefined;
+        createReturnTypeOfSignatureDeclaration(signatureDeclaration: SignatureDeclaration, enclosingDeclaration: Node, flags: NodeBuilderFlags, tracker: SymbolTracker): TypeNode | undefined;
+        createTypeOfExpression(expr: Expression, enclosingDeclaration: Node, flags: NodeBuilderFlags, tracker: SymbolTracker): TypeNode | undefined;
+        createLiteralConstValue(node: VariableDeclaration | PropertyDeclaration | PropertySignature | ParameterDeclaration): Expression;
+        isSymbolAccessible(symbol: Symbol, enclosingDeclaration: Node | undefined, meaning: SymbolFlags | undefined, shouldComputeAliasToMarkVisible: boolean): SymbolAccessibilityResult;
+        isEntityNameVisible(entityName: EntityNameOrEntityNameExpression, enclosingDeclaration: Node): SymbolVisibilityResult;
+        getConstantValue(node: EnumMember | PropertyAccessExpression | ElementAccessExpression): string | number | undefined;
+        getReferencedValueDeclaration(reference: Identifier): Declaration | undefined;
+        getTypeReferenceSerializationKind(typeName: EntityName, location?: Node): TypeReferenceSerializationKind;
+        isOptionalParameter(node: ParameterDeclaration): boolean;
+        moduleExportsSomeValue(moduleReferenceExpression: Expression): boolean;
+        isArgumentsLocalBinding(node: Identifier): boolean;
+        getExternalModuleFileFromDeclaration(declaration: ImportEqualsDeclaration | ImportDeclaration | ExportDeclaration | ModuleDeclaration | ImportTypeNode): SourceFile | undefined;
+        getTypeReferenceDirectivesForEntityName(name: EntityNameOrEntityNameExpression): string[] | undefined;
+        getTypeReferenceDirectivesForSymbol(symbol: Symbol, meaning?: SymbolFlags): string[] | undefined;
+        isLiteralConstDeclaration(node: VariableDeclaration | PropertyDeclaration | PropertySignature | ParameterDeclaration): boolean;
+        getJsxFactoryEntity(location?: Node): EntityName | undefined;
+        getAllAccessorDeclarations(declaration: AccessorDeclaration): AllAccessorDeclarations;
+    }
+    enum SymbolFlags {
+        None = 0,
+        FunctionScopedVariable = 1,
+        BlockScopedVariable = 2,
+        Property = 4,
+        EnumMember = 8,
+        Function = 16,
+        Class = 32,
+        Interface = 64,
+        ConstEnum = 128,
+        RegularEnum = 256,
+        ValueModule = 512,
+        NamespaceModule = 1024,
+        TypeLiteral = 2048,
+        ObjectLiteral = 4096,
+        Method = 8192,
+        Constructor = 16384,
+        GetAccessor = 32768,
+        SetAccessor = 65536,
+        Signature = 131072,
+        TypeParameter = 262144,
+        TypeAlias = 524288,
+        ExportValue = 1048576,
+        Alias = 2097152,
+        Prototype = 4194304,
+        ExportStar = 8388608,
+        Optional = 16777216,
+        Transient = 33554432,
+        JSContainer = 67108864,
+        All = 67108863,
+        Enum = 384,
+        Variable = 3,
+        Value = 67216319,
+        Type = 67901928,
+        Namespace = 1920,
+        Module = 1536,
+        Accessor = 98304,
+        FunctionScopedVariableExcludes = 67216318,
+        BlockScopedVariableExcludes = 67216319,
+        ParameterExcludes = 67216319,
+        PropertyExcludes = 0,
+        EnumMemberExcludes = 68008959,
+        FunctionExcludes = 67215791,
+        ClassExcludes = 68008383,
+        InterfaceExcludes = 67901832,
+        RegularEnumExcludes = 68008191,
+        ConstEnumExcludes = 68008831,
+        ValueModuleExcludes = 67215503,
+        NamespaceModuleExcludes = 0,
+        MethodExcludes = 67208127,
+        GetAccessorExcludes = 67150783,
+        SetAccessorExcludes = 67183551,
+        TypeParameterExcludes = 67639784,
+        TypeAliasExcludes = 67901928,
+        AliasExcludes = 2097152,
+        ModuleMember = 2623475,
+        ExportHasLocal = 944,
+        HasExports = 1952,
+        HasMembers = 6240,
+        BlockScoped = 418,
+        PropertyOrAccessor = 98308,
+        ClassMember = 106500,
+        Classifiable = 2885600,
+        LateBindingContainer = 6240
+    }
+    interface Symbol {
+        flags: SymbolFlags;
+        escapedName: __String;
+        declarations: Declaration[];
+        valueDeclaration: Declaration;
+        members?: SymbolTable;
+        exports?: SymbolTable;
+        globalExports?: SymbolTable;
+        id?: number;
+        mergeId?: number;
+        parent?: Symbol;
+        exportSymbol?: Symbol;
+        nameType?: Type;
+        constEnumOnlyModule?: boolean;
+        isReferenced?: SymbolFlags;
+        isReplaceableByMethod?: boolean;
+        isAssigned?: boolean;
+    }
+    interface SymbolLinks {
+        immediateTarget?: Symbol;
+        target?: Symbol;
+        type?: Type;
+        uniqueESSymbolType?: Type;
+        declaredType?: Type;
+        typeParameters?: TypeParameter[];
+        outerTypeParameters?: TypeParameter[];
+        inferredClassType?: Type;
+        instantiations?: Map<Type>;
+        mapper?: TypeMapper;
+        referenced?: boolean;
+        containingType?: UnionOrIntersectionType;
+        leftSpread?: Symbol;
+        rightSpread?: Symbol;
+        syntheticOrigin?: Symbol;
+        isDiscriminantProperty?: boolean;
+        resolvedExports?: SymbolTable;
+        resolvedMembers?: SymbolTable;
+        exportsChecked?: boolean;
+        typeParametersChecked?: boolean;
+        isDeclarationWithCollidingName?: boolean;
+        bindingElement?: BindingElement;
+        exportsSomeValue?: boolean;
+        enumKind?: EnumKind;
+        originatingImport?: ImportDeclaration | ImportCall;
+        lateSymbol?: Symbol;
+    }
+    enum EnumKind {
+        Numeric = 0,
+        Literal = 1
+    }
+    enum CheckFlags {
+        Instantiated = 1,
+        SyntheticProperty = 2,
+        SyntheticMethod = 4,
+        Readonly = 8,
+        Partial = 16,
+        HasNonUniformType = 32,
+        ContainsPublic = 64,
+        ContainsProtected = 128,
+        ContainsPrivate = 256,
+        ContainsStatic = 512,
+        Late = 1024,
+        ReverseMapped = 2048,
+        Synthetic = 6
+    }
+    interface TransientSymbol extends Symbol, SymbolLinks {
+        checkFlags: CheckFlags;
+        isRestParameter?: boolean;
+    }
+    interface ReverseMappedSymbol extends TransientSymbol {
+        propertyType: Type;
+        mappedType: MappedType;
+    }
+    enum InternalSymbolName {
+        Call = "__call",
+        Constructor = "__constructor",
+        New = "__new",
+        Index = "__index",
+        ExportStar = "__export",
+        Global = "__global",
+        Missing = "__missing",
+        Type = "__type",
+        Object = "__object",
+        JSXAttributes = "__jsxAttributes",
+        Class = "__class",
+        Function = "__function",
+        Computed = "__computed",
+        Resolving = "__resolving__",
+        ExportEquals = "export=",
+        Default = "default"
+    }
+    /**
+     * This represents a string whose leading underscore have been escaped by adding extra leading underscores.
+     * The shape of this brand is rather unique compared to others we've used.
+     * Instead of just an intersection of a string and an object, it is that union-ed
+     * with an intersection of void and an object. This makes it wholly incompatible
+     * with a normal string (which is good, it cannot be misused on assignment or on usage),
+     * while still being comparable with a normal string via === (also good) and castable from a string.
+     */
+    type __String = (string & {
+        __escapedIdentifier: void;
+    }) | (void & {
+        __escapedIdentifier: void;
+    }) | InternalSymbolName;
+    /** ReadonlyMap where keys are `__String`s. */
+    interface ReadonlyUnderscoreEscapedMap<T> {
+        get(key: __String): T | undefined;
+        has(key: __String): boolean;
+        forEach(action: (value: T, key: __String) => void): void;
+        readonly size: number;
+        keys(): Iterator<__String>;
+        values(): Iterator<T>;
+        entries(): Iterator<[__String, T]>;
+    }
+    /** Map where keys are `__String`s. */
+    interface UnderscoreEscapedMap<T> extends ReadonlyUnderscoreEscapedMap<T> {
+        set(key: __String, value: T): this;
+        delete(key: __String): boolean;
+        clear(): void;
+    }
+    /** SymbolTable based on ES6 Map interface. */
+    type SymbolTable = UnderscoreEscapedMap<Symbol>;
+    /** Used to track a `declare module "foo*"`-like declaration. */
+    interface PatternAmbientModule {
+        pattern: Pattern;
+        symbol: Symbol;
+    }
+    enum NodeCheckFlags {
+        TypeChecked = 1,
+        LexicalThis = 2,
+        CaptureThis = 4,
+        CaptureNewTarget = 8,
+        SuperInstance = 256,
+        SuperStatic = 512,
+        ContextChecked = 1024,
+        AsyncMethodWithSuper = 2048,
+        AsyncMethodWithSuperBinding = 4096,
+        CaptureArguments = 8192,
+        EnumValuesComputed = 16384,
+        LexicalModuleMergesWithClass = 32768,
+        LoopWithCapturedBlockScopedBinding = 65536,
+        CapturedBlockScopedBinding = 131072,
+        BlockScopedBindingInLoop = 262144,
+        ClassWithBodyScopedClassBinding = 524288,
+        BodyScopedClassBinding = 1048576,
+        NeedsLoopOutParameter = 2097152,
+        AssignmentsMarked = 4194304,
+        ClassWithConstructorReference = 8388608,
+        ConstructorReferenceInClass = 16777216
+    }
+    interface NodeLinks {
+        flags: NodeCheckFlags;
+        resolvedType?: Type;
+        resolvedSignature?: Signature;
+        resolvedSignatures?: Map<Signature[]>;
+        resolvedSymbol?: Symbol;
+        resolvedIndexInfo?: IndexInfo;
+        maybeTypePredicate?: boolean;
+        enumMemberValue?: string | number;
+        isVisible?: boolean;
+        containsArgumentsReference?: boolean;
+        hasReportedStatementInAmbientContext?: boolean;
+        jsxFlags: JsxFlags;
+        resolvedJsxElementAttributesType?: Type;
+        resolvedJsxElementAllAttributesType?: Type;
+        hasSuperCall?: boolean;
+        superCall?: SuperCall;
+        switchTypes?: Type[];
+    }
+    enum TypeFlags {
+        Any = 1,
+        Unknown = 2,
+        String = 4,
+        Number = 8,
+        Boolean = 16,
+        Enum = 32,
+        StringLiteral = 64,
+        NumberLiteral = 128,
+        BooleanLiteral = 256,
+        EnumLiteral = 512,
+        ESSymbol = 1024,
+        UniqueESSymbol = 2048,
+        Void = 4096,
+        Undefined = 8192,
+        Null = 16384,
+        Never = 32768,
+        TypeParameter = 65536,
+        Object = 131072,
+        Union = 262144,
+        Intersection = 524288,
+        Index = 1048576,
+        IndexedAccess = 2097152,
+        Conditional = 4194304,
+        Substitution = 8388608,
+        NonPrimitive = 16777216,
+        FreshLiteral = 33554432,
+        UnionOfUnitTypes = 67108864,
+        ContainsWideningType = 134217728,
+        ContainsObjectLiteral = 268435456,
+        ContainsAnyFunctionType = 536870912,
+        AnyOrUnknown = 3,
+        Nullable = 24576,
+        Literal = 448,
+        Unit = 27072,
+        StringOrNumberLiteral = 192,
+        StringOrNumberLiteralOrUnique = 2240,
+        DefinitelyFalsy = 29120,
+        PossiblyFalsy = 29148,
+        Intrinsic = 16839967,
+        Primitive = 32764,
+        StringLike = 68,
+        NumberLike = 168,
+        BooleanLike = 272,
+        EnumLike = 544,
+        ESSymbolLike = 3072,
+        VoidLike = 12288,
+        DisjointDomains = 16809468,
+        UnionOrIntersection = 786432,
+        StructuredType = 917504,
+        TypeVariable = 2162688,
+        InstantiableNonPrimitive = 14745600,
+        InstantiablePrimitive = 1048576,
+        Instantiable = 15794176,
+        StructuredOrInstantiable = 16711680,
+        Narrowable = 33492479,
+        NotUnionOrUnit = 16909315,
+        NotUnit = 16749629,
+        RequiresWidening = 402653184,
+        PropagatingFlags = 939524096,
+        NonWideningType = 134217728,
+        Wildcard = 268435456,
+        EmptyObject = 536870912,
+        ConstructionFlags = 939524096,
+        GenericMappedType = 134217728
+    }
+    type DestructuringPattern = BindingPattern | ObjectLiteralExpression | ArrayLiteralExpression;
+    interface Type {
+        flags: TypeFlags;
+        id: number;
+        checker: TypeChecker;
+        symbol: Symbol;
+        pattern?: DestructuringPattern;
+        aliasSymbol?: Symbol;
+        aliasTypeArguments?: Type[];
+        wildcardInstantiation?: Type;
+    }
+    interface IntrinsicType extends Type {
+        intrinsicName: string;
+    }
+    interface LiteralType extends Type {
+        value: string | number;
+        freshType: LiteralType;
+        regularType: LiteralType;
+    }
+    interface UniqueESSymbolType extends Type {
+        symbol: Symbol;
+    }
+    interface StringLiteralType extends LiteralType {
+        value: string;
+    }
+    interface NumberLiteralType extends LiteralType {
+        value: number;
+    }
+    interface EnumType extends Type {
+    }
+    enum ObjectFlags {
+        Class = 1,
+        Interface = 2,
+        Reference = 4,
+        Tuple = 8,
+        Anonymous = 16,
+        Mapped = 32,
+        Instantiated = 64,
+        ObjectLiteral = 128,
+        EvolvingArray = 256,
+        ObjectLiteralPatternWithComputedProperties = 512,
+        ContainsSpread = 1024,
+        ReverseMapped = 2048,
+        JsxAttributes = 4096,
+        MarkerType = 8192,
+        ClassOrInterface = 3
+    }
+    interface ObjectType extends Type {
+        objectFlags: ObjectFlags;
+    }
+    /** Class and interface types (ObjectFlags.Class and ObjectFlags.Interface). */
+    interface InterfaceType extends ObjectType {
+        typeParameters: TypeParameter[] | undefined;
+        outerTypeParameters: TypeParameter[] | undefined;
+        localTypeParameters: TypeParameter[] | undefined;
+        thisType: TypeParameter | undefined;
+        resolvedBaseConstructorType?: Type;
+        resolvedBaseTypes: BaseType[];
+    }
+    type BaseType = ObjectType | IntersectionType;
+    interface InterfaceTypeWithDeclaredMembers extends InterfaceType {
+        declaredProperties: Symbol[];
+        declaredCallSignatures: Signature[];
+        declaredConstructSignatures: Signature[];
+        declaredStringIndexInfo?: IndexInfo;
+        declaredNumberIndexInfo?: IndexInfo;
+    }
+    /**
+     * Type references (ObjectFlags.Reference). When a class or interface has type parameters or
+     * a "this" type, references to the class or interface are made using type references. The
+     * typeArguments property specifies the types to substitute for the type parameters of the
+     * class or interface and optionally includes an extra element that specifies the type to
+     * substitute for "this" in the resulting instantiation. When no extra argument is present,
+     * the type reference itself is substituted for "this". The typeArguments property is undefined
+     * if the class or interface has no type parameters and the reference isn't specifying an
+     * explicit "this" argument.
+     */
+    interface TypeReference extends ObjectType {
+        target: GenericType;
+        typeArguments?: Type[];
+    }
+    enum Variance {
+        Invariant = 0,
+        Covariant = 1,
+        Contravariant = 2,
+        Bivariant = 3,
+        Independent = 4
+    }
+    interface GenericType extends InterfaceType, TypeReference {
+        instantiations: Map<TypeReference>;
+        variances?: Variance[];
+    }
+    interface UnionOrIntersectionType extends Type {
+        types: Type[];
+        propertyCache: SymbolTable;
+        resolvedProperties: Symbol[];
+        resolvedIndexType: IndexType;
+        resolvedStringIndexType: IndexType;
+        resolvedBaseConstraint: Type;
+        couldContainTypeVariables: boolean;
+    }
+    interface UnionType extends UnionOrIntersectionType {
+    }
+    interface IntersectionType extends UnionOrIntersectionType {
+        resolvedApparentType: Type;
+    }
+    type StructuredType = ObjectType | UnionType | IntersectionType;
+    interface AnonymousType extends ObjectType {
+        target?: AnonymousType;
+        mapper?: TypeMapper;
+    }
+    interface MappedType extends AnonymousType {
+        declaration: MappedTypeNode;
+        typeParameter?: TypeParameter;
+        constraintType?: Type;
+        templateType?: Type;
+        modifiersType?: Type;
+    }
+    interface EvolvingArrayType extends ObjectType {
+        elementType: Type;
+        finalArrayType?: Type;
+    }
+    interface ReverseMappedType extends ObjectType {
+        source: Type;
+        mappedType: MappedType;
+    }
+    interface ResolvedType extends ObjectType, UnionOrIntersectionType {
+        members: SymbolTable;
+        properties: Symbol[];
+        callSignatures: Signature[];
+        constructSignatures: Signature[];
+        stringIndexInfo?: IndexInfo;
+        numberIndexInfo?: IndexInfo;
+    }
+    interface FreshObjectLiteralType extends ResolvedType {
+        regularType: ResolvedType;
+    }
+    interface IterableOrIteratorType extends ObjectType, UnionType {
+        iteratedTypeOfIterable?: Type;
+        iteratedTypeOfIterator?: Type;
+        iteratedTypeOfAsyncIterable?: Type;
+        iteratedTypeOfAsyncIterator?: Type;
+    }
+    interface PromiseOrAwaitableType extends ObjectType, UnionType {
+        promiseTypeOfPromiseConstructor?: Type;
+        promisedTypeOfPromise?: Type;
+        awaitedTypeOfType?: Type;
+    }
+    interface SyntheticDefaultModuleType extends Type {
+        syntheticType?: Type;
+    }
+    interface InstantiableType extends Type {
+        resolvedBaseConstraint?: Type;
+        resolvedIndexType?: IndexType;
+        resolvedStringIndexType?: IndexType;
+    }
+    interface TypeParameter extends InstantiableType {
+        /** Retrieve using getConstraintFromTypeParameter */
+        constraint?: Type;
+        default?: Type;
+        target?: TypeParameter;
+        mapper?: TypeMapper;
+        isThisType?: boolean;
+        resolvedDefaultType?: Type;
+    }
+    interface IndexedAccessType extends InstantiableType {
+        objectType: Type;
+        indexType: Type;
+        constraint?: Type;
+        simplified?: Type;
+    }
+    type TypeVariable = TypeParameter | IndexedAccessType;
+    interface IndexType extends InstantiableType {
+        type: InstantiableType | UnionOrIntersectionType;
+        stringsOnly: boolean;
+    }
+    interface ConditionalRoot {
+        node: ConditionalTypeNode;
+        checkType: Type;
+        extendsType: Type;
+        trueType: Type;
+        falseType: Type;
+        isDistributive: boolean;
+        inferTypeParameters?: TypeParameter[];
+        outerTypeParameters?: TypeParameter[];
+        instantiations?: Map<Type>;
+        aliasSymbol?: Symbol;
+        aliasTypeArguments?: Type[];
+    }
+    interface ConditionalType extends InstantiableType {
+        root: ConditionalRoot;
+        checkType: Type;
+        extendsType: Type;
+        resolvedTrueType?: Type;
+        resolvedFalseType?: Type;
+        resolvedDefaultConstraint?: Type;
+        mapper?: TypeMapper;
+        combinedMapper?: TypeMapper;
+    }
+    interface SubstitutionType extends InstantiableType {
+        typeVariable: TypeVariable;
+        substitute: Type;
+    }
+    enum SignatureKind {
+        Call = 0,
+        Construct = 1
+    }
+    interface Signature {
+        declaration?: SignatureDeclaration | JSDocSignature;
+        typeParameters?: TypeParameter[];
+        parameters: Symbol[];
+        thisParameter?: Symbol;
+        resolvedReturnType?: Type;
+        resolvedTypePredicate?: TypePredicate;
+        minArgumentCount: number;
+        hasRestParameter: boolean;
+        hasLiteralTypes: boolean;
+        target?: Signature;
+        mapper?: TypeMapper;
+        unionSignatures?: Signature[];
+        erasedSignatureCache?: Signature;
+        canonicalSignatureCache?: Signature;
+        isolatedSignatureType?: ObjectType;
+        instantiations?: Map<Signature>;
+    }
+    enum IndexKind {
+        String = 0,
+        Number = 1
+    }
+    interface IndexInfo {
+        type: Type;
+        isReadonly: boolean;
+        declaration?: IndexSignatureDeclaration;
+    }
+    type TypeMapper = (t: TypeParameter) => Type;
+    enum InferencePriority {
+        NakedTypeVariable = 1,
+        HomomorphicMappedType = 2,
+        MappedTypeConstraint = 4,
+        ReturnType = 8,
+        LiteralKeyof = 16,
+        NoConstraints = 32,
+        AlwaysStrict = 64,
+        PriorityImpliesCombination = 28
+    }
+    interface InferenceInfo {
+        typeParameter: TypeParameter;
+        candidates: Type[] | undefined;
+        contraCandidates: Type[] | undefined;
+        inferredType?: Type;
+        priority?: InferencePriority;
+        topLevel: boolean;
+        isFixed: boolean;
+    }
+    enum InferenceFlags {
+        None = 0,
+        InferUnionTypes = 1,
+        NoDefault = 2,
+        AnyDefault = 4
+    }
+    /**
+     * Ternary values are defined such that
+     * x & y is False if either x or y is False.
+     * x & y is Maybe if either x or y is Maybe, but neither x or y is False.
+     * x & y is True if both x and y are True.
+     * x | y is False if both x and y are False.
+     * x | y is Maybe if either x or y is Maybe, but neither x or y is True.
+     * x | y is True if either x or y is True.
+     */
+    enum Ternary {
+        False = 0,
+        Maybe = 1,
+        True = -1
+    }
+    type TypeComparer = (s: Type, t: Type, reportErrors?: boolean) => Ternary;
+    interface InferenceContext extends TypeMapper {
+        typeParameters: TypeParameter[];
+        signature?: Signature;
+        inferences: InferenceInfo[];
+        flags: InferenceFlags;
+        compareTypes: TypeComparer;
+    }
+    interface WideningContext {
+        parent?: WideningContext;
+        propertyName?: __String;
+        siblings?: Type[];
+        resolvedProperties?: Symbol[];
+    }
+    enum SpecialPropertyAssignmentKind {
+        None = 0,
+        ExportsProperty = 1,
+        ModuleExports = 2,
+        PrototypeProperty = 3,
+        ThisProperty = 4,
+        Property = 5,
+        Prototype = 6
+    }
+    /** @deprecated Use FileExtensionInfo instead. */
+    type JsFileExtensionInfo = FileExtensionInfo;
+    interface FileExtensionInfo {
+        extension: string;
+        isMixedContent: boolean;
+        scriptKind?: ScriptKind;
+    }
+    interface DiagnosticMessage {
+        key: string;
+        category: DiagnosticCategory;
+        code: number;
+        message: string;
+        reportsUnnecessary?: {};
+    }
+    /**
+     * A linked list of formatted diagnostic messages to be used as part of a multiline message.
+     * It is built from the bottom up, leaving the head to be the "main" diagnostic.
+     * While it seems that DiagnosticMessageChain is structurally similar to DiagnosticMessage,
+     * the difference is that messages are all preformatted in DMC.
+     */
+    interface DiagnosticMessageChain {
+        messageText: string;
+        category: DiagnosticCategory;
+        code: number;
+        next?: DiagnosticMessageChain;
+    }
+    interface Diagnostic {
+        file: SourceFile | undefined;
+        start: number | undefined;
+        length: number | undefined;
+        messageText: string | DiagnosticMessageChain;
+        category: DiagnosticCategory;
+        /** May store more in future. For now, this will simply be `true` to indicate when a diagnostic is an unused-identifier diagnostic. */
+        reportsUnnecessary?: {};
+        code: number;
+        source?: string;
+    }
+    interface DiagnosticWithLocation extends Diagnostic {
+        file: SourceFile;
+        start: number;
+        length: number;
+    }
+    enum DiagnosticCategory {
+        Warning = 0,
+        Error = 1,
+        Suggestion = 2,
+        Message = 3
+    }
+    function diagnosticCategoryName(d: {
+        category: DiagnosticCategory;
+    }, lowerCase?: boolean): string;
+    enum ModuleResolutionKind {
+        Classic = 1,
+        NodeJs = 2
+    }
+    interface PluginImport {
+        name: string;
+    }
+    interface ProjectReference {
+        /** A normalized path on disk */
+        path: string;
+        /** The path as the user originally wrote it */
+        originalPath?: string;
+        /** True if the output of this reference should be prepended to the output of this project. Only valid for --outFile compilations */
+        prepend?: boolean;
+        /** True if it is intended that this reference form a circularity */
+        circular?: boolean;
+    }
+    type CompilerOptionsValue = string | number | boolean | (string | number)[] | string[] | MapLike<string[]> | PluginImport[] | ProjectReference[] | null | undefined;
+    interface CompilerOptions {
+        all?: boolean;
+        allowJs?: boolean;
+        allowNonTsExtensions?: boolean;
+        allowSyntheticDefaultImports?: boolean;
+        allowUnreachableCode?: boolean;
+        allowUnusedLabels?: boolean;
+        alwaysStrict?: boolean;
+        baseUrl?: string;
+        /** An error if set - this should only go through the -b pipeline and not actually be observed */
+        build?: boolean;
+        charset?: string;
+        checkJs?: boolean;
+        configFilePath?: string;
+        /** configFile is set as non enumerable property so as to avoid checking of json source files */
+        readonly configFile?: TsConfigSourceFile;
+        declaration?: boolean;
+        declarationMap?: boolean;
+        emitDeclarationOnly?: boolean;
+        declarationDir?: string;
+        diagnostics?: boolean;
+        extendedDiagnostics?: boolean;
+        disableSizeLimit?: boolean;
+        downlevelIteration?: boolean;
+        emitBOM?: boolean;
+        emitDecoratorMetadata?: boolean;
+        experimentalDecorators?: boolean;
+        forceConsistentCasingInFileNames?: boolean;
+        help?: boolean;
+        importHelpers?: boolean;
+        init?: boolean;
+        inlineSourceMap?: boolean;
+        inlineSources?: boolean;
+        isolatedModules?: boolean;
+        jsx?: JsxEmit;
+        keyofStringsOnly?: boolean;
+        lib?: string[];
+        listEmittedFiles?: boolean;
+        listFiles?: boolean;
+        locale?: string;
+        mapRoot?: string;
+        maxNodeModuleJsDepth?: number;
+        module?: ModuleKind;
+        moduleResolution?: ModuleResolutionKind;
+        newLine?: NewLineKind;
+        noEmit?: boolean;
+        noEmitForJsFiles?: boolean;
+        noEmitHelpers?: boolean;
+        noEmitOnError?: boolean;
+        noErrorTruncation?: boolean;
+        noFallthroughCasesInSwitch?: boolean;
+        noImplicitAny?: boolean;
+        noImplicitReturns?: boolean;
+        noImplicitThis?: boolean;
+        noStrictGenericChecks?: boolean;
+        noUnusedLocals?: boolean;
+        noUnusedParameters?: boolean;
+        noImplicitUseStrict?: boolean;
+        noLib?: boolean;
+        noResolve?: boolean;
+        out?: string;
+        outDir?: string;
+        outFile?: string;
+        paths?: MapLike<string[]>;
+        plugins?: PluginImport[];
+        preserveConstEnums?: boolean;
+        preserveSymlinks?: boolean;
+        preserveWatchOutput?: boolean;
+        project?: string;
+        pretty?: boolean;
+        reactNamespace?: string;
+        jsxFactory?: string;
+        composite?: boolean;
+        removeComments?: boolean;
+        rootDir?: string;
+        rootDirs?: string[];
+        skipLibCheck?: boolean;
+        skipDefaultLibCheck?: boolean;
+        sourceMap?: boolean;
+        sourceRoot?: string;
+        strict?: boolean;
+        strictFunctionTypes?: boolean;
+        strictNullChecks?: boolean;
+        strictPropertyInitialization?: boolean;
+        stripInternal?: boolean;
+        suppressExcessPropertyErrors?: boolean;
+        suppressImplicitAnyIndexErrors?: boolean;
+        suppressOutputPathCheck?: boolean;
+        target?: ScriptTarget;
+        traceResolution?: boolean;
+        resolveJsonModule?: boolean;
+        types?: string[];
+        /** Paths used to compute primary types search locations */
+        typeRoots?: string[];
+        version?: boolean;
+        watch?: boolean;
+        esModuleInterop?: boolean;
+        [option: string]: CompilerOptionsValue | TsConfigSourceFile | undefined;
+    }
+    interface TypeAcquisition {
+        enableAutoDiscovery?: boolean;
+        enable?: boolean;
+        include?: string[];
+        exclude?: string[];
+        [option: string]: string[] | boolean | undefined;
+    }
+    enum ModuleKind {
+        None = 0,
+        CommonJS = 1,
+        AMD = 2,
+        UMD = 3,
+        System = 4,
+        ES2015 = 5,
+        ESNext = 6
+    }
+    enum JsxEmit {
+        None = 0,
+        Preserve = 1,
+        React = 2,
+        ReactNative = 3
+    }
+    enum NewLineKind {
+        CarriageReturnLineFeed = 0,
+        LineFeed = 1
+    }
+    interface LineAndCharacter {
+        /** 0-based. */
+        line: number;
+        character: number;
+    }
+    enum ScriptKind {
+        Unknown = 0,
+        JS = 1,
+        JSX = 2,
+        TS = 3,
+        TSX = 4,
+        External = 5,
+        JSON = 6,
+        /**
+         * Used on extensions that doesn't define the ScriptKind but the content defines it.
+         * Deferred extensions are going to be included in all project contexts.
+         */
+        Deferred = 7
+    }
+    enum ScriptTarget {
+        ES3 = 0,
+        ES5 = 1,
+        ES2015 = 2,
+        ES2016 = 3,
+        ES2017 = 4,
+        ES2018 = 5,
+        ESNext = 6,
+        JSON = 100,
+        Latest = 6
+    }
+    enum LanguageVariant {
+        Standard = 0,
+        JSX = 1
+    }
+    /** Either a parsed command line or a parsed tsconfig.json */
+    interface ParsedCommandLine {
+        options: CompilerOptions;
+        typeAcquisition?: TypeAcquisition;
+        fileNames: string[];
+        projectReferences?: ReadonlyArray<ProjectReference>;
+        raw?: any;
+        errors: Diagnostic[];
+        wildcardDirectories?: MapLike<WatchDirectoryFlags>;
+        compileOnSave?: boolean;
+        configFileSpecs?: ConfigFileSpecs;
+    }
+    enum WatchDirectoryFlags {
+        None = 0,
+        Recursive = 1
+    }
+    interface ConfigFileSpecs {
+        filesSpecs: ReadonlyArray<string> | undefined;
+        referencesSpecs: ReadonlyArray<ProjectReference> | undefined;
+        /**
+         * Present to report errors (user specified specs), validatedIncludeSpecs are used for file name matching
+         */
+        includeSpecs?: ReadonlyArray<string>;
+        /**
+         * Present to report errors (user specified specs), validatedExcludeSpecs are used for file name matching
+         */
+        excludeSpecs?: ReadonlyArray<string>;
+        validatedIncludeSpecs?: ReadonlyArray<string>;
+        validatedExcludeSpecs?: ReadonlyArray<string>;
+        wildcardDirectories: MapLike<WatchDirectoryFlags>;
+    }
+    interface ExpandResult {
+        fileNames: string[];
+        projectReferences: ReadonlyArray<ProjectReference> | undefined;
+        wildcardDirectories: MapLike<WatchDirectoryFlags>;
+        spec: ConfigFileSpecs;
+    }
+    interface CreateProgramOptions {
+        rootNames: ReadonlyArray<string>;
+        options: CompilerOptions;
+        projectReferences?: ReadonlyArray<ProjectReference>;
+        host?: CompilerHost;
+        oldProgram?: Program;
+        configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>;
+    }
+    interface CommandLineOptionBase {
+        name: string;
+        type: "string" | "number" | "boolean" | "object" | "list" | Map<number | string>;
+        isFilePath?: boolean;
+        shortName?: string;
+        description?: DiagnosticMessage;
+        paramType?: DiagnosticMessage;
+        isTSConfigOnly?: boolean;
+        isCommandLineOnly?: boolean;
+        showInSimplifiedHelpView?: boolean;
+        category?: DiagnosticMessage;
+    }
+    interface CommandLineOptionOfPrimitiveType extends CommandLineOptionBase {
+        type: "string" | "number" | "boolean";
+    }
+    interface CommandLineOptionOfCustomType extends CommandLineOptionBase {
+        type: Map<number | string>;
+    }
+    interface TsConfigOnlyOption extends CommandLineOptionBase {
+        type: "object";
+        elementOptions?: Map<CommandLineOption>;
+        extraKeyDiagnosticMessage?: DiagnosticMessage;
+    }
+    interface CommandLineOptionOfListType extends CommandLineOptionBase {
+        type: "list";
+        element: CommandLineOptionOfCustomType | CommandLineOptionOfPrimitiveType | TsConfigOnlyOption;
+    }
+    type CommandLineOption = CommandLineOptionOfCustomType | CommandLineOptionOfPrimitiveType | TsConfigOnlyOption | CommandLineOptionOfListType;
+    enum CharacterCodes {
+        nullCharacter = 0,
+        maxAsciiCharacter = 127,
+        lineFeed = 10,
+        carriageReturn = 13,
+        lineSeparator = 8232,
+        paragraphSeparator = 8233,
+        nextLine = 133,
+        space = 32,
+        nonBreakingSpace = 160,
+        enQuad = 8192,
+        emQuad = 8193,
+        enSpace = 8194,
+        emSpace = 8195,
+        threePerEmSpace = 8196,
+        fourPerEmSpace = 8197,
+        sixPerEmSpace = 8198,
+        figureSpace = 8199,
+        punctuationSpace = 8200,
+        thinSpace = 8201,
+        hairSpace = 8202,
+        zeroWidthSpace = 8203,
+        narrowNoBreakSpace = 8239,
+        ideographicSpace = 12288,
+        mathematicalSpace = 8287,
+        ogham = 5760,
+        _ = 95,
+        $ = 36,
+        _0 = 48,
+        _1 = 49,
+        _2 = 50,
+        _3 = 51,
+        _4 = 52,
+        _5 = 53,
+        _6 = 54,
+        _7 = 55,
+        _8 = 56,
+        _9 = 57,
+        a = 97,
+        b = 98,
+        c = 99,
+        d = 100,
+        e = 101,
+        f = 102,
+        g = 103,
+        h = 104,
+        i = 105,
+        j = 106,
+        k = 107,
+        l = 108,
+        m = 109,
+        n = 110,
+        o = 111,
+        p = 112,
+        q = 113,
+        r = 114,
+        s = 115,
+        t = 116,
+        u = 117,
+        v = 118,
+        w = 119,
+        x = 120,
+        y = 121,
+        z = 122,
+        A = 65,
+        B = 66,
+        C = 67,
+        D = 68,
+        E = 69,
+        F = 70,
+        G = 71,
+        H = 72,
+        I = 73,
+        J = 74,
+        K = 75,
+        L = 76,
+        M = 77,
+        N = 78,
+        O = 79,
+        P = 80,
+        Q = 81,
+        R = 82,
+        S = 83,
+        T = 84,
+        U = 85,
+        V = 86,
+        W = 87,
+        X = 88,
+        Y = 89,
+        Z = 90,
+        ampersand = 38,
+        asterisk = 42,
+        at = 64,
+        backslash = 92,
+        backtick = 96,
+        bar = 124,
+        caret = 94,
+        closeBrace = 125,
+        closeBracket = 93,
+        closeParen = 41,
+        colon = 58,
+        comma = 44,
+        dot = 46,
+        doubleQuote = 34,
+        equals = 61,
+        exclamation = 33,
+        greaterThan = 62,
+        hash = 35,
+        lessThan = 60,
+        minus = 45,
+        openBrace = 123,
+        openBracket = 91,
+        openParen = 40,
+        percent = 37,
+        plus = 43,
+        question = 63,
+        semicolon = 59,
+        singleQuote = 39,
+        slash = 47,
+        tilde = 126,
+        backspace = 8,
+        formFeed = 12,
+        byteOrderMark = 65279,
+        tab = 9,
+        verticalTab = 11
+    }
+    interface ModuleResolutionHost {
+        fileExists(fileName: string): boolean;
+        readFile(fileName: string): string | undefined;
+        trace?(s: string): void;
+        directoryExists?(directoryName: string): boolean;
+        /**
+         * Resolve a symbolic link.
+         * @see https://nodejs.org/api/fs.html#fs_fs_realpathsync_path_options
+         */
+        realpath?(path: string): string;
+        getCurrentDirectory?(): string;
+        getDirectories?(path: string): string[];
+    }
+    /**
+     * Represents the result of module resolution.
+     * Module resolution will pick up tsx/jsx/js files even if '--jsx' and '--allowJs' are turned off.
+     * The Program will then filter results based on these flags.
+     *
+     * Prefer to return a `ResolvedModuleFull` so that the file type does not have to be inferred.
+     */
+    interface ResolvedModule {
+        /** Path of the file the module was resolved to. */
+        resolvedFileName: string;
+        /** True if `resolvedFileName` comes from `node_modules`. */
+        isExternalLibraryImport?: boolean;
+    }
+    /**
+     * ResolvedModule with an explicitly provided `extension` property.
+     * Prefer this over `ResolvedModule`.
+     * If changing this, remember to change `moduleResolutionIsEqualTo`.
+     */
+    interface ResolvedModuleFull extends ResolvedModule {
+        readonly originalPath?: string;
+        /**
+         * Extension of resolvedFileName. This must match what's at the end of resolvedFileName.
+         * This is optional for backwards-compatibility, but will be added if not provided.
+         */
+        extension: Extension;
+        packageId?: PackageId;
+    }
+    /**
+     * Unique identifier with a package name and version.
+     * If changing this, remember to change `packageIdIsEqual`.
+     */
+    interface PackageId {
+        /**
+         * Name of the package.
+         * Should not include `@types`.
+         * If accessing a non-index file, this should include its name e.g. "foo/bar".
+         */
+        name: string;
+        /**
+         * Name of a submodule within this package.
+         * May be "".
+         */
+        subModuleName: string;
+        /** Version of the package, e.g. "1.2.3" */
+        version: string;
+    }
+    enum Extension {
+        Ts = ".ts",
+        Tsx = ".tsx",
+        Dts = ".d.ts",
+        Js = ".js",
+        Jsx = ".jsx",
+        Json = ".json"
+    }
+    interface ResolvedModuleWithFailedLookupLocations {
+        readonly resolvedModule: ResolvedModuleFull | undefined;
+        readonly failedLookupLocations: ReadonlyArray<string>;
+    }
+    interface ResolvedTypeReferenceDirective {
+        primary: boolean;
+        resolvedFileName: string | undefined;
+        packageId?: PackageId;
+    }
+    interface ResolvedTypeReferenceDirectiveWithFailedLookupLocations {
+        readonly resolvedTypeReferenceDirective: ResolvedTypeReferenceDirective | undefined;
+        readonly failedLookupLocations: ReadonlyArray<string>;
+    }
+    type HasInvalidatedResolution = (sourceFile: Path) => boolean;
+    interface CompilerHost extends ModuleResolutionHost {
+        getSourceFile(fileName: string, languageVersion: ScriptTarget, onError?: (message: string) => void, shouldCreateNewSourceFile?: boolean): SourceFile | undefined;
+        getSourceFileByPath?(fileName: string, path: Path, languageVersion: ScriptTarget, onError?: (message: string) => void, shouldCreateNewSourceFile?: boolean): SourceFile | undefined;
+        getCancellationToken?(): CancellationToken;
+        getDefaultLibFileName(options: CompilerOptions): string;
+        getDefaultLibLocation?(): string;
+        writeFile: WriteFileCallback;
+        getCurrentDirectory(): string;
+        getDirectories(path: string): string[];
+        getCanonicalFileName(fileName: string): string;
+        useCaseSensitiveFileNames(): boolean;
+        getNewLine(): string;
+        readDirectory?(rootDir: string, extensions: ReadonlyArray<string>, excludes: ReadonlyArray<string> | undefined, includes: ReadonlyArray<string>, depth?: number): string[];
+        resolveModuleNames?(moduleNames: string[], containingFile: string, reusedNames?: string[]): (ResolvedModule | undefined)[];
+        /**
+         * This method is a companion for 'resolveModuleNames' and is used to resolve 'types' references to actual type declaration files
+         */
+        resolveTypeReferenceDirectives?(typeReferenceDirectiveNames: string[], containingFile: string): ResolvedTypeReferenceDirective[];
+        getEnvironmentVariable?(name: string): string | undefined;
+        onReleaseOldSourceFile?(oldSourceFile: SourceFile, oldOptions: CompilerOptions): void;
+        hasInvalidatedResolution?: HasInvalidatedResolution;
+        hasChangedAutomaticTypeDirectiveNames?: boolean;
+        createHash?(data: string): string;
+        getModifiedTime?(fileName: string): Date;
+        setModifiedTime?(fileName: string, date: Date): void;
+        deleteFile?(fileName: string): void;
+    }
+    enum TransformFlags {
+        None = 0,
+        TypeScript = 1,
+        ContainsTypeScript = 2,
+        ContainsJsx = 4,
+        ContainsESNext = 8,
+        ContainsES2017 = 16,
+        ContainsES2016 = 32,
+        ES2015 = 64,
+        ContainsES2015 = 128,
+        Generator = 256,
+        ContainsGenerator = 512,
+        DestructuringAssignment = 1024,
+        ContainsDestructuringAssignment = 2048,
+        ContainsDecorators = 4096,
+        ContainsPropertyInitializer = 8192,
+        ContainsLexicalThis = 16384,
+        ContainsCapturedLexicalThis = 32768,
+        ContainsLexicalThisInComputedPropertyName = 65536,
+        ContainsDefaultValueAssignments = 131072,
+        ContainsParameterPropertyAssignments = 262144,
+        ContainsSpread = 524288,
+        ContainsObjectSpread = 1048576,
+        ContainsRest = 524288,
+        ContainsObjectRest = 1048576,
+        ContainsComputedPropertyName = 2097152,
+        ContainsBlockScopedBinding = 4194304,
+        ContainsBindingPattern = 8388608,
+        ContainsYield = 16777216,
+        ContainsHoistedDeclarationOrCompletion = 33554432,
+        ContainsDynamicImport = 67108864,
+        Super = 134217728,
+        ContainsSuper = 268435456,
+        HasComputedFlags = 536870912,
+        AssertTypeScript = 3,
+        AssertJsx = 4,
+        AssertESNext = 8,
+        AssertES2017 = 16,
+        AssertES2016 = 32,
+        AssertES2015 = 192,
+        AssertGenerator = 768,
+        AssertDestructuringAssignment = 3072,
+        OuterExpressionExcludes = 536872257,
+        PropertyAccessExcludes = 671089985,
+        NodeExcludes = 939525441,
+        ArrowFunctionExcludes = 1003902273,
+        FunctionExcludes = 1003935041,
+        ConstructorExcludes = 1003668801,
+        MethodOrAccessorExcludes = 1003668801,
+        ClassExcludes = 942011713,
+        ModuleExcludes = 977327425,
+        TypeExcludes = -3,
+        ObjectLiteralExcludes = 942740801,
+        ArrayLiteralOrCallOrNewExcludes = 940049729,
+        VariableDeclarationListExcludes = 948962625,
+        ParameterExcludes = 939525441,
+        CatchClauseExcludes = 940574017,
+        BindingPatternExcludes = 940049729,
+        TypeScriptClassSyntaxMask = 274432,
+        ES2015FunctionSyntaxMask = 163840
+    }
+    interface SourceMapRange extends TextRange {
+        source?: SourceMapSource;
+    }
+    interface SourceMapSource {
+        fileName: string;
+        text: string;
+        lineMap: ReadonlyArray<number>;
+        skipTrivia?: (pos: number) => number;
+    }
+    interface EmitNode {
+        annotatedNodes?: Node[];
+        flags: EmitFlags;
+        leadingComments?: SynthesizedComment[];
+        trailingComments?: SynthesizedComment[];
+        commentRange?: TextRange;
+        sourceMapRange?: SourceMapRange;
+        tokenSourceMapRanges?: (SourceMapRange | undefined)[];
+        constantValue?: string | number;
+        externalHelpersModuleName?: Identifier;
+        helpers?: EmitHelper[];
+        startsOnNewLine?: boolean;
+    }
+    enum EmitFlags {
+        None = 0,
+        SingleLine = 1,
+        AdviseOnEmitNode = 2,
+        NoSubstitution = 4,
+        CapturesThis = 8,
+        NoLeadingSourceMap = 16,
+        NoTrailingSourceMap = 32,
+        NoSourceMap = 48,
+        NoNestedSourceMaps = 64,
+        NoTokenLeadingSourceMaps = 128,
+        NoTokenTrailingSourceMaps = 256,
+        NoTokenSourceMaps = 384,
+        NoLeadingComments = 512,
+        NoTrailingComments = 1024,
+        NoComments = 1536,
+        NoNestedComments = 2048,
+        HelperName = 4096,
+        ExportName = 8192,
+        LocalName = 16384,
+        InternalName = 32768,
+        Indented = 65536,
+        NoIndentation = 131072,
+        AsyncFunctionBody = 262144,
+        ReuseTempVariableScope = 524288,
+        CustomPrologue = 1048576,
+        NoHoisting = 2097152,
+        HasEndOfDeclarationMarker = 4194304,
+        Iterator = 8388608,
+        NoAsciiEscaping = 16777216,
+        TypeScriptClassWrapper = 33554432,
+        NeverApplyImportHelper = 67108864
+    }
+    interface EmitHelper {
+        readonly name: string;
+        readonly scoped: boolean;
+        readonly text: string | ((node: EmitHelperUniqueNameCallback) => string);
+        readonly priority?: number;
+    }
+    type UniqueNameHandler = (baseName: string, checkFn?: (name: string) => boolean, optimistic?: boolean) => string;
+    type EmitHelperUniqueNameCallback = (name: string) => string;
+    /**
+     * Used by the checker, this enum keeps track of external emit helpers that should be type
+     * checked.
+     */
+    enum ExternalEmitHelpers {
+        Extends = 1,
+        Assign = 2,
+        Rest = 4,
+        Decorate = 8,
+        Metadata = 16,
+        Param = 32,
+        Awaiter = 64,
+        Generator = 128,
+        Values = 256,
+        Read = 512,
+        Spread = 1024,
+        Await = 2048,
+        AsyncGenerator = 4096,
+        AsyncDelegator = 8192,
+        AsyncValues = 16384,
+        ExportStar = 32768,
+        MakeTemplateObject = 65536,
+        FirstEmitHelper = 1,
+        LastEmitHelper = 65536,
+        ForOfIncludes = 256,
+        ForAwaitOfIncludes = 16384,
+        AsyncGeneratorIncludes = 6144,
+        AsyncDelegatorIncludes = 26624,
+        SpreadIncludes = 1536
+    }
+    enum EmitHint {
+        SourceFile = 0,
+        Expression = 1,
+        IdentifierName = 2,
+        MappedTypeParameter = 3,
+        Unspecified = 4
+    }
+    interface EmitHost extends ScriptReferenceHost, ModuleSpecifierResolutionHost {
+        getSourceFiles(): ReadonlyArray<SourceFile>;
+        getCurrentDirectory(): string;
+        isSourceFileFromExternalLibrary(file: SourceFile): boolean;
+        getCommonSourceDirectory(): string;
+        getCanonicalFileName(fileName: string): string;
+        getNewLine(): string;
+        isEmitBlocked(emitFileName: string): boolean;
+        getPrependNodes(): ReadonlyArray<InputFiles>;
+        writeFile: WriteFileCallback;
+    }
+    interface TransformationContext {
+        getEmitResolver(): EmitResolver;
+        getEmitHost(): EmitHost;
+        /** Gets the compiler options supplied to the transformer. */
+        getCompilerOptions(): CompilerOptions;
+        /** Starts a new lexical environment. */
+        startLexicalEnvironment(): void;
+        /** Suspends the current lexical environment, usually after visiting a parameter list. */
+        suspendLexicalEnvironment(): void;
+        /** Resumes a suspended lexical environment, usually before visiting a function body. */
+        resumeLexicalEnvironment(): void;
+        /** Ends a lexical environment, returning any declarations. */
+        endLexicalEnvironment(): Statement[] | undefined;
+        /** Hoists a function declaration to the containing scope. */
+        hoistFunctionDeclaration(node: FunctionDeclaration): void;
+        /** Hoists a variable declaration to the containing scope. */
+        hoistVariableDeclaration(node: Identifier): void;
+        /** Records a request for a non-scoped emit helper in the current context. */
+        requestEmitHelper(helper: EmitHelper): void;
+        /** Gets and resets the requested non-scoped emit helpers. */
+        readEmitHelpers(): EmitHelper[] | undefined;
+        /** Enables expression substitutions in the pretty printer for the provided SyntaxKind. */
+        enableSubstitution(kind: SyntaxKind): void;
+        /** Determines whether expression substitutions are enabled for the provided node. */
+        isSubstitutionEnabled(node: Node): boolean;
+        /**
+         * Hook used by transformers to substitute expressions just before they
+         * are emitted by the pretty printer.
+         *
+         * NOTE: Transformation hooks should only be modified during `Transformer` initialization,
+         * before returning the `NodeTransformer` callback.
+         */
+        onSubstituteNode: (hint: EmitHint, node: Node) => Node;
+        /**
+         * Enables before/after emit notifications in the pretty printer for the provided
+         * SyntaxKind.
+         */
+        enableEmitNotification(kind: SyntaxKind): void;
+        /**
+         * Determines whether before/after emit notifications should be raised in the pretty
+         * printer when it emits a node.
+         */
+        isEmitNotificationEnabled(node: Node): boolean;
+        /**
+         * Hook used to allow transformers to capture state before or after
+         * the printer emits a node.
+         *
+         * NOTE: Transformation hooks should only be modified during `Transformer` initialization,
+         * before returning the `NodeTransformer` callback.
+         */
+        onEmitNode: (hint: EmitHint, node: Node, emitCallback: (hint: EmitHint, node: Node) => void) => void;
+        addDiagnostic(diag: DiagnosticWithLocation): void;
+    }
+    interface TransformationResult<T extends Node> {
+        /** Gets the transformed source files. */
+        transformed: T[];
+        /** Gets diagnostics for the transformation. */
+        diagnostics?: DiagnosticWithLocation[];
+        /**
+         * Gets a substitute for a node, if one is available; otherwise, returns the original node.
+         *
+         * @param hint A hint as to the intended usage of the node.
+         * @param node The node to substitute.
+         */
+        substituteNode(hint: EmitHint, node: Node): Node;
+        /**
+         * Emits a node with possible notification.
+         *
+         * @param hint A hint as to the intended usage of the node.
+         * @param node The node to emit.
+         * @param emitCallback A callback used to emit the node.
+         */
+        emitNodeWithNotification(hint: EmitHint, node: Node, emitCallback: (hint: EmitHint, node: Node) => void): void;
+        /**
+         * Clean up EmitNode entries on any parse-tree nodes.
+         */
+        dispose(): void;
+    }
+    /**
+     * A function that is used to initialize and return a `Transformer` callback, which in turn
+     * will be used to transform one or more nodes.
+     */
+    type TransformerFactory<T extends Node> = (context: TransformationContext) => Transformer<T>;
+    /**
+     * A function that transforms a node.
+     */
+    type Transformer<T extends Node> = (node: T) => T;
+    /**
+     * A function that accepts and possibly transforms a node.
+     */
+    type Visitor = (node: Node) => VisitResult<Node>;
+    type VisitResult<T extends Node> = T | T[] | undefined;
+    interface Printer {
+        /**
+         * Print a node and its subtree as-is, without any emit transformations.
+         * @param hint A value indicating the purpose of a node. This is primarily used to
+         * distinguish between an `Identifier` used in an expression position, versus an
+         * `Identifier` used as an `IdentifierName` as part of a declaration. For most nodes you
+         * should just pass `Unspecified`.
+         * @param node The node to print. The node and its subtree are printed as-is, without any
+         * emit transformations.
+         * @param sourceFile A source file that provides context for the node. The source text of
+         * the file is used to emit the original source content for literals and identifiers, while
+         * the identifiers of the source file are used when generating unique names to avoid
+         * collisions.
+         */
+        printNode(hint: EmitHint, node: Node, sourceFile: SourceFile): string;
+        /**
+         * Prints a list of nodes using the given format flags
+         */
+        printList<T extends Node>(format: ListFormat, list: NodeArray<T>, sourceFile: SourceFile): string;
+        /**
+         * Prints a source file as-is, without any emit transformations.
+         */
+        printFile(sourceFile: SourceFile): string;
+        /**
+         * Prints a bundle of source files as-is, without any emit transformations.
+         */
+        printBundle(bundle: Bundle): string;
+        writeNode(hint: EmitHint, node: Node, sourceFile: SourceFile | undefined, writer: EmitTextWriter): void;
+        writeList<T extends Node>(format: ListFormat, list: NodeArray<T> | undefined, sourceFile: SourceFile | undefined, writer: EmitTextWriter): void;
+        writeFile(sourceFile: SourceFile, writer: EmitTextWriter): void;
+        writeBundle(bundle: Bundle, writer: EmitTextWriter, info?: BundleInfo): void;
+    }
+    /**
+     * When a bundle contains prepended content, we store a file on disk indicating where the non-prepended
+     * content of that file starts. On a subsequent build where there are no upstream .d.ts changes, we
+     * read the bundle info file and the original .js file to quickly re-use portion of the file
+     * that didn't originate in prepended content.
+     */
+    interface BundleInfo {
+        originalOffset: number;
+        totalLength: number;
+    }
+    interface PrintHandlers {
+        /**
+         * A hook used by the Printer when generating unique names to avoid collisions with
+         * globally defined names that exist outside of the current source file.
+         */
+        hasGlobalName?(name: string): boolean;
+        /**
+         * A hook used by the Printer to provide notifications prior to emitting a node. A
+         * compatible implementation **must** invoke `emitCallback` with the provided `hint` and
+         * `node` values.
+         * @param hint A hint indicating the intended purpose of the node.
+         * @param node The node to emit.
+         * @param emitCallback A callback that, when invoked, will emit the node.
+         * @example
+         * ```ts
+         * var printer = createPrinter(printerOptions, {
+         *   onEmitNode(hint, node, emitCallback) {
+         *     // set up or track state prior to emitting the node...
+         *     emitCallback(hint, node);
+         *     // restore state after emitting the node...
+         *   }
+         * });
+         * ```
+         */
+        onEmitNode?(hint: EmitHint, node: Node | undefined, emitCallback: (hint: EmitHint, node: Node | undefined) => void): void;
+        /**
+         * A hook used by the Printer to perform just-in-time substitution of a node. This is
+         * primarily used by node transformations that need to substitute one node for another,
+         * such as replacing `myExportedVar` with `exports.myExportedVar`.
+         * @param hint A hint indicating the intended purpose of the node.
+         * @param node The node to emit.
+         * @example
+         * ```ts
+         * var printer = createPrinter(printerOptions, {
+         *   substituteNode(hint, node) {
+         *     // perform substitution if necessary...
+         *     return node;
+         *   }
+         * });
+         * ```
+         */
+        substituteNode?(hint: EmitHint, node: Node): Node;
+        onEmitSourceMapOfNode?: (hint: EmitHint, node: Node, emitCallback: (hint: EmitHint, node: Node) => void) => void;
+        onEmitSourceMapOfToken?: (node: Node | undefined, token: SyntaxKind, writer: (s: string) => void, pos: number, emitCallback: (token: SyntaxKind, writer: (s: string) => void, pos: number) => number) => number;
+        onEmitSourceMapOfPosition?: (pos: number) => void;
+        onSetSourceFile?: (node: SourceFile) => void;
+        onBeforeEmitNodeArray?: (nodes: NodeArray<any> | undefined) => void;
+        onAfterEmitNodeArray?: (nodes: NodeArray<any> | undefined) => void;
+        onBeforeEmitToken?: (node: Node) => void;
+        onAfterEmitToken?: (node: Node) => void;
+    }
+    interface PrinterOptions {
+        removeComments?: boolean;
+        newLine?: NewLineKind;
+        omitTrailingSemicolon?: boolean;
+        noEmitHelpers?: boolean;
+        module?: CompilerOptions["module"];
+        target?: CompilerOptions["target"];
+        sourceMap?: boolean;
+        inlineSourceMap?: boolean;
+        extendedDiagnostics?: boolean;
+        onlyPrintJsDocStyle?: boolean;
+    }
+    interface EmitTextWriter extends SymbolWriter {
+        write(s: string): void;
+        writeTextOfNode(text: string, node: Node): void;
+        getText(): string;
+        rawWrite(s: string): void;
+        writeLiteral(s: string): void;
+        getTextPos(): number;
+        getLine(): number;
+        getColumn(): number;
+        getIndent(): number;
+        isAtStartOfLine(): boolean;
+    }
+    interface GetEffectiveTypeRootsHost {
+        directoryExists?(directoryName: string): boolean;
+        getCurrentDirectory?(): string;
+    }
+    /** @internal */
+    interface ModuleSpecifierResolutionHost extends GetEffectiveTypeRootsHost {
+        useCaseSensitiveFileNames?(): boolean;
+        fileExists?(path: string): boolean;
+        readFile?(path: string): string | undefined;
+    }
+    /** @deprecated See comment on SymbolWriter */
+    interface SymbolTracker {
+        trackSymbol?(symbol: Symbol, enclosingDeclaration?: Node, meaning?: SymbolFlags): void;
+        reportInaccessibleThisError?(): void;
+        reportPrivateInBaseOfClassExpression?(propertyName: string): void;
+        reportInaccessibleUniqueSymbolError?(): void;
+        moduleResolverHost?: ModuleSpecifierResolutionHost;
+        trackReferencedAmbientModule?(decl: ModuleDeclaration): void;
+    }
+    interface TextSpan {
+        start: number;
+        length: number;
+    }
+    interface TextChangeRange {
+        span: TextSpan;
+        newLength: number;
+    }
+    interface DiagnosticCollection {
+        add(diagnostic: Diagnostic): void;
+        getGlobalDiagnostics(): Diagnostic[];
+        getDiagnostics(fileName: string): DiagnosticWithLocation[];
+        getDiagnostics(): Diagnostic[];
+        reattachFileDiagnostics(newFile: SourceFile): void;
+    }
+    interface SyntaxList extends Node {
+        _children: Node[];
+    }
+    enum ListFormat {
+        None = 0,
+        SingleLine = 0,
+        MultiLine = 1,
+        PreserveLines = 2,
+        LinesMask = 3,
+        NotDelimited = 0,
+        BarDelimited = 4,
+        AmpersandDelimited = 8,
+        CommaDelimited = 16,
+        DelimitersMask = 28,
+        AllowTrailingComma = 32,
+        Indented = 64,
+        SpaceBetweenBraces = 128,
+        SpaceBetweenSiblings = 256,
+        Braces = 512,
+        Parenthesis = 1024,
+        AngleBrackets = 2048,
+        SquareBrackets = 4096,
+        BracketsMask = 7680,
+        OptionalIfUndefined = 8192,
+        OptionalIfEmpty = 16384,
+        Optional = 24576,
+        PreferNewLine = 32768,
+        NoTrailingNewLine = 65536,
+        NoInterveningComments = 131072,
+        NoSpaceIfEmpty = 262144,
+        SingleElement = 524288,
+        Modifiers = 131328,
+        HeritageClauses = 256,
+        SingleLineTypeLiteralMembers = 384,
+        MultiLineTypeLiteralMembers = 16449,
+        TupleTypeElements = 272,
+        UnionTypeConstituents = 260,
+        IntersectionTypeConstituents = 264,
+        ObjectBindingPatternElements = 262576,
+        ArrayBindingPatternElements = 262448,
+        ObjectLiteralExpressionProperties = 263122,
+        ArrayLiteralExpressionElements = 4466,
+        CommaListElements = 272,
+        CallExpressionArguments = 1296,
+        NewExpressionArguments = 9488,
+        TemplateExpressionSpans = 131072,
+        SingleLineBlockStatements = 384,
+        MultiLineBlockStatements = 65,
+        VariableDeclarationList = 272,
+        SingleLineFunctionBodyStatements = 384,
+        MultiLineFunctionBodyStatements = 1,
+        ClassHeritageClauses = 0,
+        ClassMembers = 65,
+        InterfaceMembers = 65,
+        EnumMembers = 81,
+        CaseBlockClauses = 65,
+        NamedImportsOrExportsElements = 262576,
+        JsxElementOrFragmentChildren = 131072,
+        JsxElementAttributes = 131328,
+        CaseOrDefaultClauseStatements = 81985,
+        HeritageClauseTypes = 272,
+        SourceFileStatements = 65537,
+        Decorators = 24577,
+        TypeArguments = 26896,
+        TypeParameters = 26896,
+        Parameters = 1296,
+        IndexSignatureParameters = 4432
+    }
+    enum PragmaKindFlags {
+        None = 0,
+        /**
+         * Triple slash comment of the form
+         * /// <pragma-name argname="value" />
+         */
+        TripleSlashXML = 1,
+        /**
+         * Single line comment of the form
+         * // @pragma-name argval1 argval2
+         * or
+         * /// @pragma-name argval1 argval2
+         */
+        SingleLine = 2,
+        /**
+         * Multiline non-jsdoc pragma of the form
+         * /* @pragma-name argval1 argval2 * /
+         */
+        MultiLine = 4,
+        All = 7,
+        Default = 7
+    }
+    interface PragmaArgumentSpecification<TName extends string> {
+        name: TName;
+        optional?: boolean;
+        captureSpan?: boolean;
+    }
+    interface PragmaDefinition<T1 extends string = string, T2 extends string = string, T3 extends string = string, T4 extends string = string> {
+        args?: [PragmaArgumentSpecification<T1>] | [PragmaArgumentSpecification<T1>, PragmaArgumentSpecification<T2>] | [PragmaArgumentSpecification<T1>, PragmaArgumentSpecification<T2>, PragmaArgumentSpecification<T3>] | [PragmaArgumentSpecification<T1>, PragmaArgumentSpecification<T2>, PragmaArgumentSpecification<T3>, PragmaArgumentSpecification<T4>];
+        kind?: PragmaKindFlags;
+    }
+    const commentPragmas: {
+        "reference": {
+            args: [{
+                name: "types";
+                optional: true;
+                captureSpan: true;
+            }, {
+                name: "lib";
+                optional: true;
+                captureSpan: true;
+            }, {
+                name: "path";
+                optional: true;
+                captureSpan: true;
+            }, {
+                name: "no-default-lib";
+                optional: true;
+            }];
+            kind: PragmaKindFlags;
+        };
+        "amd-dependency": {
+            args: [{
+                name: "path";
+            }, {
+                name: "name";
+                optional: true;
+            }];
+            kind: PragmaKindFlags;
+        };
+        "amd-module": {
+            args: [{
+                name: "name";
+            }];
+            kind: PragmaKindFlags;
+        };
+        "ts-check": {
+            kind: PragmaKindFlags;
+        };
+        "ts-nocheck": {
+            kind: PragmaKindFlags;
+        };
+        "jsx": {
+            args: [{
+                name: "factory";
+            }];
+            kind: PragmaKindFlags;
+        };
+    };
+    type PragmaArgTypeMaybeCapture<TDesc> = TDesc extends {
+        captureSpan: true;
+    } ? {
+        value: string;
+        pos: number;
+        end: number;
+    } : string;
+    type PragmaArgTypeOptional<TDesc, TName extends string> = TDesc extends {
+        optional: true;
+    } ? {
+        [K in TName]?: PragmaArgTypeMaybeCapture<TDesc>;
+    } : {
+        [K in TName]: PragmaArgTypeMaybeCapture<TDesc>;
+    };
+    /**
+     * Maps a pragma definition into the desired shape for its arguments object
+     * Maybe the below is a good argument for types being iterable on struture in some way.
+     */
+    type PragmaArgumentType<T extends PragmaDefinition> = T extends {
+        args: [PragmaArgumentSpecification<infer TName1>, PragmaArgumentSpecification<infer TName2>, PragmaArgumentSpecification<infer TName3>, PragmaArgumentSpecification<infer TName4>];
+    } ? PragmaArgTypeOptional<T["args"][0], TName1> & PragmaArgTypeOptional<T["args"][1], TName2> & PragmaArgTypeOptional<T["args"][2], TName3> & PragmaArgTypeOptional<T["args"][2], TName4> : T extends {
+        args: [PragmaArgumentSpecification<infer TName1>, PragmaArgumentSpecification<infer TName2>, PragmaArgumentSpecification<infer TName3>];
+    } ? PragmaArgTypeOptional<T["args"][0], TName1> & PragmaArgTypeOptional<T["args"][1], TName2> & PragmaArgTypeOptional<T["args"][2], TName3> : T extends {
+        args: [PragmaArgumentSpecification<infer TName1>, PragmaArgumentSpecification<infer TName2>];
+    } ? PragmaArgTypeOptional<T["args"][0], TName1> & PragmaArgTypeOptional<T["args"][1], TName2> : T extends {
+        args: [PragmaArgumentSpecification<infer TName>];
+    } ? PragmaArgTypeOptional<T["args"][0], TName> : object;
+    type ConcretePragmaSpecs = typeof commentPragmas;
+    type PragmaPsuedoMap = {
+        [K in keyof ConcretePragmaSpecs]?: {
+            arguments: PragmaArgumentType<ConcretePragmaSpecs[K]>;
+            range: CommentRange;
+        };
+    };
+    type PragmaPsuedoMapEntry = {
+        [K in keyof PragmaPsuedoMap]: {
+            name: K;
+            args: PragmaPsuedoMap[K];
+        };
+    }[keyof PragmaPsuedoMap];
+    /**
+     * A strongly-typed es6 map of pragma entries, the values of which are either a single argument
+     * value (if only one was found), or an array of multiple argument values if the pragma is present
+     * in multiple places
+     */
+    interface PragmaMap extends Map<PragmaPsuedoMap[keyof PragmaPsuedoMap] | PragmaPsuedoMap[keyof PragmaPsuedoMap][]> {
+        set<TKey extends keyof PragmaPsuedoMap>(key: TKey, value: PragmaPsuedoMap[TKey] | PragmaPsuedoMap[TKey][]): this;
+        get<TKey extends keyof PragmaPsuedoMap>(key: TKey): PragmaPsuedoMap[TKey] | PragmaPsuedoMap[TKey][];
+        forEach(action: <TKey extends keyof PragmaPsuedoMap>(value: PragmaPsuedoMap[TKey] | PragmaPsuedoMap[TKey][], key: TKey) => void): void;
+    }
+}
+declare function setTimeout(handler: (...args: any[]) => void, timeout: number): any;
+declare function clearTimeout(handle: any): void;
+declare namespace ts {
+    /**
+     * Set a high stack trace limit to provide more information in case of an error.
+     * Called for command-line and server use cases.
+     * Not called if TypeScript is used as a library.
+     */
+    function setStackTraceLimit(): void;
+    enum FileWatcherEventKind {
+        Created = 0,
+        Changed = 1,
+        Deleted = 2
+    }
+    type FileWatcherCallback = (fileName: string, eventKind: FileWatcherEventKind) => void;
+    type DirectoryWatcherCallback = (fileName: string) => void;
+    interface WatchedFile {
+        readonly fileName: string;
+        readonly callback: FileWatcherCallback;
+        mtime: Date;
+    }
+    enum PollingInterval {
+        High = 2000,
+        Medium = 500,
+        Low = 250
+    }
+    function watchFileUsingPriorityPollingInterval(host: System, fileName: string, callback: FileWatcherCallback, watchPriority: PollingInterval): FileWatcher;
+    type HostWatchFile = (fileName: string, callback: FileWatcherCallback, pollingInterval: PollingInterval | undefined) => FileWatcher;
+    type HostWatchDirectory = (fileName: string, callback: DirectoryWatcherCallback, recursive?: boolean) => FileWatcher;
+    const missingFileModifiedTime: Date;
+    let unchangedPollThresholds: {
+        [PollingInterval.Low]: number;
+        [PollingInterval.Medium]: number;
+        [PollingInterval.High]: number;
+    };
+    function setCustomPollingValues(system: System): void;
+    function createDynamicPriorityPollingWatchFile(host: {
+        getModifiedTime: System["getModifiedTime"];
+        setTimeout: System["setTimeout"];
+    }): HostWatchFile;
+    /**
+     * Returns true if file status changed
+     */
+    function onWatchedFileStat(watchedFile: WatchedFile, modifiedTime: Date): boolean;
+    interface RecursiveDirectoryWatcherHost {
+        watchDirectory: HostWatchDirectory;
+        getAccessibleSortedChildDirectories(path: string): ReadonlyArray<string>;
+        directoryExists(dir: string): boolean;
+        filePathComparer: Comparer<string>;
+        realpath(s: string): string;
+    }
+    /**
+     * Watch the directory recursively using host provided method to watch child directories
+     * that means if this is recursive watcher, watch the children directories as well
+     * (eg on OS that dont support recursive watch using fs.watch use fs.watchFile)
+     */
+    function createRecursiveDirectoryWatcher(host: RecursiveDirectoryWatcherHost): (directoryName: string, callback: DirectoryWatcherCallback) => FileWatcher;
+    interface System {
+        args: string[];
+        newLine: string;
+        useCaseSensitiveFileNames: boolean;
+        write(s: string): void;
+        writeOutputIsTTY?(): boolean;
+        readFile(path: string, encoding?: string): string | undefined;
+        getFileSize?(path: string): number;
+        writeFile(path: string, data: string, writeByteOrderMark?: boolean): void;
+        /**
+         * @pollingInterval - this parameter is used in polling-based watchers and ignored in watchers that
+         * use native OS file watching
+         */
+        watchFile?(path: string, callback: FileWatcherCallback, pollingInterval?: number): FileWatcher;
+        watchDirectory?(path: string, callback: DirectoryWatcherCallback, recursive?: boolean): FileWatcher;
+        resolvePath(path: string): string;
+        fileExists(path: string): boolean;
+        directoryExists(path: string): boolean;
+        createDirectory(path: string): void;
+        getExecutingFilePath(): string;
+        getCurrentDirectory(): string;
+        getDirectories(path: string): string[];
+        readDirectory(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
+        getModifiedTime?(path: string): Date;
+        setModifiedTime?(path: string, time: Date): void;
+        deleteFile?(path: string): void;
+        /**
+         * A good implementation is node.js' `crypto.createHash`. (https://nodejs.org/api/crypto.html#crypto_crypto_createhash_algorithm)
+         */
+        createHash?(data: string): string;
+        /** This must be cryptographically secure. Only implement this method using `crypto.createHash("sha256")`. */
+        createSHA256Hash?(data: string): string;
+        getMemoryUsage?(): number;
+        exit(exitCode?: number): void;
+        realpath?(path: string): string;
+        getEnvironmentVariable(name: string): string;
+        tryEnableSourceMapsForHost?(): void;
+        debugMode?: boolean;
+        setTimeout?(callback: (...args: any[]) => void, ms: number, ...args: any[]): any;
+        clearTimeout?(timeoutId: any): void;
+        clearScreen?(): void;
+        setBlocking?(): void;
+        base64decode?(input: string): string;
+        base64encode?(input: string): string;
+    }
+    interface FileWatcher {
+        close(): void;
+    }
+    function getNodeMajorVersion(): number | undefined;
+    let sys: System;
+}
+declare namespace ts {
+    const Diagnostics: {
+        Unterminated_string_literal: DiagnosticMessage;
+        Identifier_expected: DiagnosticMessage;
+        _0_expected: DiagnosticMessage;
+        A_file_cannot_have_a_reference_to_itself: DiagnosticMessage;
+        Trailing_comma_not_allowed: DiagnosticMessage;
+        Asterisk_Slash_expected: DiagnosticMessage;
+        An_element_access_expression_should_take_an_argument: DiagnosticMessage;
+        Unexpected_token: DiagnosticMessage;
+        A_rest_parameter_or_binding_pattern_may_not_have_a_trailing_comma: DiagnosticMessage;
+        A_rest_parameter_must_be_last_in_a_parameter_list: DiagnosticMessage;
+        Parameter_cannot_have_question_mark_and_initializer: DiagnosticMessage;
+        A_required_parameter_cannot_follow_an_optional_parameter: DiagnosticMessage;
+        An_index_signature_cannot_have_a_rest_parameter: DiagnosticMessage;
+        An_index_signature_parameter_cannot_have_an_accessibility_modifier: DiagnosticMessage;
+        An_index_signature_parameter_cannot_have_a_question_mark: DiagnosticMessage;
+        An_index_signature_parameter_cannot_have_an_initializer: DiagnosticMessage;
+        An_index_signature_must_have_a_type_annotation: DiagnosticMessage;
+        An_index_signature_parameter_must_have_a_type_annotation: DiagnosticMessage;
+        An_index_signature_parameter_type_must_be_string_or_number: DiagnosticMessage;
+        readonly_modifier_can_only_appear_on_a_property_declaration_or_index_signature: DiagnosticMessage;
+        Accessibility_modifier_already_seen: DiagnosticMessage;
+        _0_modifier_must_precede_1_modifier: DiagnosticMessage;
+        _0_modifier_already_seen: DiagnosticMessage;
+        _0_modifier_cannot_appear_on_a_class_element: DiagnosticMessage;
+        super_must_be_followed_by_an_argument_list_or_member_access: DiagnosticMessage;
+        Only_ambient_modules_can_use_quoted_names: DiagnosticMessage;
+        Statements_are_not_allowed_in_ambient_contexts: DiagnosticMessage;
+        A_declare_modifier_cannot_be_used_in_an_already_ambient_context: DiagnosticMessage;
+        Initializers_are_not_allowed_in_ambient_contexts: DiagnosticMessage;
+        _0_modifier_cannot_be_used_in_an_ambient_context: DiagnosticMessage;
+        _0_modifier_cannot_be_used_with_a_class_declaration: DiagnosticMessage;
+        _0_modifier_cannot_be_used_here: DiagnosticMessage;
+        _0_modifier_cannot_appear_on_a_data_property: DiagnosticMessage;
+        _0_modifier_cannot_appear_on_a_module_or_namespace_element: DiagnosticMessage;
+        A_0_modifier_cannot_be_used_with_an_interface_declaration: DiagnosticMessage;
+        A_declare_modifier_is_required_for_a_top_level_declaration_in_a_d_ts_file: DiagnosticMessage;
+        A_rest_parameter_cannot_be_optional: DiagnosticMessage;
+        A_rest_parameter_cannot_have_an_initializer: DiagnosticMessage;
+        A_set_accessor_must_have_exactly_one_parameter: DiagnosticMessage;
+        A_set_accessor_cannot_have_an_optional_parameter: DiagnosticMessage;
+        A_set_accessor_parameter_cannot_have_an_initializer: DiagnosticMessage;
+        A_set_accessor_cannot_have_rest_parameter: DiagnosticMessage;
+        A_get_accessor_cannot_have_parameters: DiagnosticMessage;
+        Type_0_is_not_a_valid_async_function_return_type_in_ES5_SlashES3_because_it_does_not_refer_to_a_Promise_compatible_constructor_value: DiagnosticMessage;
+        Accessors_are_only_available_when_targeting_ECMAScript_5_and_higher: DiagnosticMessage;
+        An_async_function_or_method_must_have_a_valid_awaitable_return_type: DiagnosticMessage;
+        The_return_type_of_an_async_function_must_either_be_a_valid_promise_or_must_not_contain_a_callable_then_member: DiagnosticMessage;
+        A_promise_must_have_a_then_method: DiagnosticMessage;
+        The_first_parameter_of_the_then_method_of_a_promise_must_be_a_callback: DiagnosticMessage;
+        Enum_member_must_have_initializer: DiagnosticMessage;
+        Type_is_referenced_directly_or_indirectly_in_the_fulfillment_callback_of_its_own_then_method: DiagnosticMessage;
+        An_export_assignment_cannot_be_used_in_a_namespace: DiagnosticMessage;
+        The_return_type_of_an_async_function_or_method_must_be_the_global_Promise_T_type: DiagnosticMessage;
+        In_ambient_enum_declarations_member_initializer_must_be_constant_expression: DiagnosticMessage;
+        Unexpected_token_A_constructor_method_accessor_or_property_was_expected: DiagnosticMessage;
+        Unexpected_token_A_type_parameter_name_was_expected_without_curly_braces: DiagnosticMessage;
+        _0_modifier_cannot_appear_on_a_type_member: DiagnosticMessage;
+        _0_modifier_cannot_appear_on_an_index_signature: DiagnosticMessage;
+        A_0_modifier_cannot_be_used_with_an_import_declaration: DiagnosticMessage;
+        Invalid_reference_directive_syntax: DiagnosticMessage;
+        Octal_literals_are_not_available_when_targeting_ECMAScript_5_and_higher_Use_the_syntax_0: DiagnosticMessage;
+        An_accessor_cannot_be_declared_in_an_ambient_context: DiagnosticMessage;
+        _0_modifier_cannot_appear_on_a_constructor_declaration: DiagnosticMessage;
+        _0_modifier_cannot_appear_on_a_parameter: DiagnosticMessage;
+        Only_a_single_variable_declaration_is_allowed_in_a_for_in_statement: DiagnosticMessage;
+        Type_parameters_cannot_appear_on_a_constructor_declaration: DiagnosticMessage;
+        Type_annotation_cannot_appear_on_a_constructor_declaration: DiagnosticMessage;
+        An_accessor_cannot_have_type_parameters: DiagnosticMessage;
+        A_set_accessor_cannot_have_a_return_type_annotation: DiagnosticMessage;
+        An_index_signature_must_have_exactly_one_parameter: DiagnosticMessage;
+        _0_list_cannot_be_empty: DiagnosticMessage;
+        Type_parameter_list_cannot_be_empty: DiagnosticMessage;
+        Type_argument_list_cannot_be_empty: DiagnosticMessage;
+        Invalid_use_of_0_in_strict_mode: DiagnosticMessage;
+        with_statements_are_not_allowed_in_strict_mode: DiagnosticMessage;
+        delete_cannot_be_called_on_an_identifier_in_strict_mode: DiagnosticMessage;
+        A_for_await_of_statement_is_only_allowed_within_an_async_function_or_async_generator: DiagnosticMessage;
+        A_continue_statement_can_only_be_used_within_an_enclosing_iteration_statement: DiagnosticMessage;
+        A_break_statement_can_only_be_used_within_an_enclosing_iteration_or_switch_statement: DiagnosticMessage;
+        Jump_target_cannot_cross_function_boundary: DiagnosticMessage;
+        A_return_statement_can_only_be_used_within_a_function_body: DiagnosticMessage;
+        Expression_expected: DiagnosticMessage;
+        Type_expected: DiagnosticMessage;
+        A_default_clause_cannot_appear_more_than_once_in_a_switch_statement: DiagnosticMessage;
+        Duplicate_label_0: DiagnosticMessage;
+        A_continue_statement_can_only_jump_to_a_label_of_an_enclosing_iteration_statement: DiagnosticMessage;
+        A_break_statement_can_only_jump_to_a_label_of_an_enclosing_statement: DiagnosticMessage;
+        An_object_literal_cannot_have_multiple_properties_with_the_same_name_in_strict_mode: DiagnosticMessage;
+        An_object_literal_cannot_have_multiple_get_Slashset_accessors_with_the_same_name: DiagnosticMessage;
+        An_object_literal_cannot_have_property_and_accessor_with_the_same_name: DiagnosticMessage;
+        An_export_assignment_cannot_have_modifiers: DiagnosticMessage;
+        Octal_literals_are_not_allowed_in_strict_mode: DiagnosticMessage;
+        A_tuple_type_element_list_cannot_be_empty: DiagnosticMessage;
+        Variable_declaration_list_cannot_be_empty: DiagnosticMessage;
+        Digit_expected: DiagnosticMessage;
+        Hexadecimal_digit_expected: DiagnosticMessage;
+        Unexpected_end_of_text: DiagnosticMessage;
+        Invalid_character: DiagnosticMessage;
+        Declaration_or_statement_expected: DiagnosticMessage;
+        Statement_expected: DiagnosticMessage;
+        case_or_default_expected: DiagnosticMessage;
+        Property_or_signature_expected: DiagnosticMessage;
+        Enum_member_expected: DiagnosticMessage;
+        Variable_declaration_expected: DiagnosticMessage;
+        Argument_expression_expected: DiagnosticMessage;
+        Property_assignment_expected: DiagnosticMessage;
+        Expression_or_comma_expected: DiagnosticMessage;
+        Parameter_declaration_expected: DiagnosticMessage;
+        Type_parameter_declaration_expected: DiagnosticMessage;
+        Type_argument_expected: DiagnosticMessage;
+        String_literal_expected: DiagnosticMessage;
+        Line_break_not_permitted_here: DiagnosticMessage;
+        or_expected: DiagnosticMessage;
+        Declaration_expected: DiagnosticMessage;
+        Import_declarations_in_a_namespace_cannot_reference_a_module: DiagnosticMessage;
+        Cannot_use_imports_exports_or_module_augmentations_when_module_is_none: DiagnosticMessage;
+        File_name_0_differs_from_already_included_file_name_1_only_in_casing: DiagnosticMessage;
+        new_T_cannot_be_used_to_create_an_array_Use_new_Array_T_instead: DiagnosticMessage;
+        const_declarations_must_be_initialized: DiagnosticMessage;
+        const_declarations_can_only_be_declared_inside_a_block: DiagnosticMessage;
+        let_declarations_can_only_be_declared_inside_a_block: DiagnosticMessage;
+        Unterminated_template_literal: DiagnosticMessage;
+        Unterminated_regular_expression_literal: DiagnosticMessage;
+        An_object_member_cannot_be_declared_optional: DiagnosticMessage;
+        A_yield_expression_is_only_allowed_in_a_generator_body: DiagnosticMessage;
+        Computed_property_names_are_not_allowed_in_enums: DiagnosticMessage;
+        A_computed_property_name_in_an_ambient_context_must_refer_to_an_expression_whose_type_is_a_literal_type_or_a_unique_symbol_type: DiagnosticMessage;
+        A_computed_property_name_in_a_class_property_declaration_must_refer_to_an_expression_whose_type_is_a_literal_type_or_a_unique_symbol_type: DiagnosticMessage;
+        A_computed_property_name_in_a_method_overload_must_refer_to_an_expression_whose_type_is_a_literal_type_or_a_unique_symbol_type: DiagnosticMessage;
+        A_computed_property_name_in_an_interface_must_refer_to_an_expression_whose_type_is_a_literal_type_or_a_unique_symbol_type: DiagnosticMessage;
+        A_computed_property_name_in_a_type_literal_must_refer_to_an_expression_whose_type_is_a_literal_type_or_a_unique_symbol_type: DiagnosticMessage;
+        A_comma_expression_is_not_allowed_in_a_computed_property_name: DiagnosticMessage;
+        extends_clause_already_seen: DiagnosticMessage;
+        extends_clause_must_precede_implements_clause: DiagnosticMessage;
+        Classes_can_only_extend_a_single_class: DiagnosticMessage;
+        implements_clause_already_seen: DiagnosticMessage;
+        Interface_declaration_cannot_have_implements_clause: DiagnosticMessage;
+        Binary_digit_expected: DiagnosticMessage;
+        Octal_digit_expected: DiagnosticMessage;
+        Unexpected_token_expected: DiagnosticMessage;
+        Property_destructuring_pattern_expected: DiagnosticMessage;
+        Array_element_destructuring_pattern_expected: DiagnosticMessage;
+        A_destructuring_declaration_must_have_an_initializer: DiagnosticMessage;
+        An_implementation_cannot_be_declared_in_ambient_contexts: DiagnosticMessage;
+        Modifiers_cannot_appear_here: DiagnosticMessage;
+        Merge_conflict_marker_encountered: DiagnosticMessage;
+        A_rest_element_cannot_have_an_initializer: DiagnosticMessage;
+        A_parameter_property_may_not_be_declared_using_a_binding_pattern: DiagnosticMessage;
+        Only_a_single_variable_declaration_is_allowed_in_a_for_of_statement: DiagnosticMessage;
+        The_variable_declaration_of_a_for_in_statement_cannot_have_an_initializer: DiagnosticMessage;
+        The_variable_declaration_of_a_for_of_statement_cannot_have_an_initializer: DiagnosticMessage;
+        An_import_declaration_cannot_have_modifiers: DiagnosticMessage;
+        Module_0_has_no_default_export: DiagnosticMessage;
+        An_export_declaration_cannot_have_modifiers: DiagnosticMessage;
+        Export_declarations_are_not_permitted_in_a_namespace: DiagnosticMessage;
+        Catch_clause_variable_cannot_have_a_type_annotation: DiagnosticMessage;
+        Catch_clause_variable_cannot_have_an_initializer: DiagnosticMessage;
+        An_extended_Unicode_escape_value_must_be_between_0x0_and_0x10FFFF_inclusive: DiagnosticMessage;
+        Unterminated_Unicode_escape_sequence: DiagnosticMessage;
+        Line_terminator_not_permitted_before_arrow: DiagnosticMessage;
+        Import_assignment_cannot_be_used_when_targeting_ECMAScript_modules_Consider_using_import_Asterisk_as_ns_from_mod_import_a_from_mod_import_d_from_mod_or_another_module_format_instead: DiagnosticMessage;
+        Export_assignment_cannot_be_used_when_targeting_ECMAScript_modules_Consider_using_export_default_or_another_module_format_instead: DiagnosticMessage;
+        Cannot_re_export_a_type_when_the_isolatedModules_flag_is_provided: DiagnosticMessage;
+        Decorators_are_not_valid_here: DiagnosticMessage;
+        Decorators_cannot_be_applied_to_multiple_get_Slashset_accessors_of_the_same_name: DiagnosticMessage;
+        Cannot_compile_namespaces_when_the_isolatedModules_flag_is_provided: DiagnosticMessage;
+        Ambient_const_enums_are_not_allowed_when_the_isolatedModules_flag_is_provided: DiagnosticMessage;
+        Invalid_use_of_0_Class_definitions_are_automatically_in_strict_mode: DiagnosticMessage;
+        A_class_declaration_without_the_default_modifier_must_have_a_name: DiagnosticMessage;
+        Identifier_expected_0_is_a_reserved_word_in_strict_mode: DiagnosticMessage;
+        Identifier_expected_0_is_a_reserved_word_in_strict_mode_Class_definitions_are_automatically_in_strict_mode: DiagnosticMessage;
+        Identifier_expected_0_is_a_reserved_word_in_strict_mode_Modules_are_automatically_in_strict_mode: DiagnosticMessage;
+        Invalid_use_of_0_Modules_are_automatically_in_strict_mode: DiagnosticMessage;
+        Identifier_expected_esModule_is_reserved_as_an_exported_marker_when_transforming_ECMAScript_modules: DiagnosticMessage;
+        Export_assignment_is_not_supported_when_module_flag_is_system: DiagnosticMessage;
+        Experimental_support_for_decorators_is_a_feature_that_is_subject_to_change_in_a_future_release_Set_the_experimentalDecorators_option_to_remove_this_warning: DiagnosticMessage;
+        Generators_are_only_available_when_targeting_ECMAScript_2015_or_higher: DiagnosticMessage;
+        Generators_are_not_allowed_in_an_ambient_context: DiagnosticMessage;
+        An_overload_signature_cannot_be_declared_as_a_generator: DiagnosticMessage;
+        _0_tag_already_specified: DiagnosticMessage;
+        Signature_0_must_be_a_type_predicate: DiagnosticMessage;
+        Cannot_find_parameter_0: DiagnosticMessage;
+        Type_predicate_0_is_not_assignable_to_1: DiagnosticMessage;
+        Parameter_0_is_not_in_the_same_position_as_parameter_1: DiagnosticMessage;
+        A_type_predicate_is_only_allowed_in_return_type_position_for_functions_and_methods: DiagnosticMessage;
+        A_type_predicate_cannot_reference_a_rest_parameter: DiagnosticMessage;
+        A_type_predicate_cannot_reference_element_0_in_a_binding_pattern: DiagnosticMessage;
+        An_export_assignment_can_only_be_used_in_a_module: DiagnosticMessage;
+        An_import_declaration_can_only_be_used_in_a_namespace_or_module: DiagnosticMessage;
+        An_export_declaration_can_only_be_used_in_a_module: DiagnosticMessage;
+        An_ambient_module_declaration_is_only_allowed_at_the_top_level_in_a_file: DiagnosticMessage;
+        A_namespace_declaration_is_only_allowed_in_a_namespace_or_module: DiagnosticMessage;
+        The_return_type_of_a_property_decorator_function_must_be_either_void_or_any: DiagnosticMessage;
+        The_return_type_of_a_parameter_decorator_function_must_be_either_void_or_any: DiagnosticMessage;
+        Unable_to_resolve_signature_of_class_decorator_when_called_as_an_expression: DiagnosticMessage;
+        Unable_to_resolve_signature_of_parameter_decorator_when_called_as_an_expression: DiagnosticMessage;
+        Unable_to_resolve_signature_of_property_decorator_when_called_as_an_expression: DiagnosticMessage;
+        Unable_to_resolve_signature_of_method_decorator_when_called_as_an_expression: DiagnosticMessage;
+        abstract_modifier_can_only_appear_on_a_class_method_or_property_declaration: DiagnosticMessage;
+        _0_modifier_cannot_be_used_with_1_modifier: DiagnosticMessage;
+        Abstract_methods_can_only_appear_within_an_abstract_class: DiagnosticMessage;
+        Method_0_cannot_have_an_implementation_because_it_is_marked_abstract: DiagnosticMessage;
+        An_interface_property_cannot_have_an_initializer: DiagnosticMessage;
+        A_type_literal_property_cannot_have_an_initializer: DiagnosticMessage;
+        A_class_member_cannot_have_the_0_keyword: DiagnosticMessage;
+        A_decorator_can_only_decorate_a_method_implementation_not_an_overload: DiagnosticMessage;
+        Function_declarations_are_not_allowed_inside_blocks_in_strict_mode_when_targeting_ES3_or_ES5: DiagnosticMessage;
+        Function_declarations_are_not_allowed_inside_blocks_in_strict_mode_when_targeting_ES3_or_ES5_Class_definitions_are_automatically_in_strict_mode: DiagnosticMessage;
+        Function_declarations_are_not_allowed_inside_blocks_in_strict_mode_when_targeting_ES3_or_ES5_Modules_are_automatically_in_strict_mode: DiagnosticMessage;
+        _0_tag_cannot_be_used_independently_as_a_top_level_JSDoc_tag: DiagnosticMessage;
+        A_const_initializer_in_an_ambient_context_must_be_a_string_or_numeric_literal: DiagnosticMessage;
+        A_definite_assignment_assertion_is_not_permitted_in_this_context: DiagnosticMessage;
+        with_statements_are_not_allowed_in_an_async_function_block: DiagnosticMessage;
+        await_expression_is_only_allowed_within_an_async_function: DiagnosticMessage;
+        can_only_be_used_in_an_object_literal_property_inside_a_destructuring_assignment: DiagnosticMessage;
+        The_body_of_an_if_statement_cannot_be_the_empty_statement: DiagnosticMessage;
+        Global_module_exports_may_only_appear_in_module_files: DiagnosticMessage;
+        Global_module_exports_may_only_appear_in_declaration_files: DiagnosticMessage;
+        Global_module_exports_may_only_appear_at_top_level: DiagnosticMessage;
+        A_parameter_property_cannot_be_declared_using_a_rest_parameter: DiagnosticMessage;
+        An_abstract_accessor_cannot_have_an_implementation: DiagnosticMessage;
+        A_default_export_can_only_be_used_in_an_ECMAScript_style_module: DiagnosticMessage;
+        Type_of_await_operand_must_either_be_a_valid_promise_or_must_not_contain_a_callable_then_member: DiagnosticMessage;
+        Type_of_yield_operand_in_an_async_generator_must_either_be_a_valid_promise_or_must_not_contain_a_callable_then_member: DiagnosticMessage;
+        Type_of_iterated_elements_of_a_yield_Asterisk_operand_must_either_be_a_valid_promise_or_must_not_contain_a_callable_then_member: DiagnosticMessage;
+        Dynamic_import_is_only_supported_when_module_flag_is_commonjs_or_esNext: DiagnosticMessage;
+        Dynamic_import_must_have_one_specifier_as_an_argument: DiagnosticMessage;
+        Specifier_of_dynamic_import_cannot_be_spread_element: DiagnosticMessage;
+        Dynamic_import_cannot_have_type_arguments: DiagnosticMessage;
+        String_literal_with_double_quotes_expected: DiagnosticMessage;
+        Property_value_can_only_be_string_literal_numeric_literal_true_false_null_object_literal_or_array_literal: DiagnosticMessage;
+        _0_accepts_too_few_arguments_to_be_used_as_a_decorator_here_Did_you_mean_to_call_it_first_and_write_0: DiagnosticMessage;
+        A_property_of_an_interface_or_type_literal_whose_type_is_a_unique_symbol_type_must_be_readonly: DiagnosticMessage;
+        A_property_of_a_class_whose_type_is_a_unique_symbol_type_must_be_both_static_and_readonly: DiagnosticMessage;
+        A_variable_whose_type_is_a_unique_symbol_type_must_be_const: DiagnosticMessage;
+        unique_symbol_types_may_not_be_used_on_a_variable_declaration_with_a_binding_name: DiagnosticMessage;
+        unique_symbol_types_are_only_allowed_on_variables_in_a_variable_statement: DiagnosticMessage;
+        unique_symbol_types_are_not_allowed_here: DiagnosticMessage;
+        An_index_signature_parameter_type_cannot_be_a_type_alias_Consider_writing_0_Colon_1_Colon_2_instead: DiagnosticMessage;
+        An_index_signature_parameter_type_cannot_be_a_union_type_Consider_using_a_mapped_object_type_instead: DiagnosticMessage;
+        infer_declarations_are_only_permitted_in_the_extends_clause_of_a_conditional_type: DiagnosticMessage;
+        Module_0_does_not_refer_to_a_value_but_is_used_as_a_value_here: DiagnosticMessage;
+        Module_0_does_not_refer_to_a_type_but_is_used_as_a_type_here: DiagnosticMessage;
+        Type_arguments_cannot_be_used_here: DiagnosticMessage;
+        The_import_meta_meta_property_is_only_allowed_using_ESNext_for_the_target_and_module_compiler_options: DiagnosticMessage;
+        Duplicate_identifier_0: DiagnosticMessage;
+        Initializer_of_instance_member_variable_0_cannot_reference_identifier_1_declared_in_the_constructor: DiagnosticMessage;
+        Static_members_cannot_reference_class_type_parameters: DiagnosticMessage;
+        Circular_definition_of_import_alias_0: DiagnosticMessage;
+        Cannot_find_name_0: DiagnosticMessage;
+        Module_0_has_no_exported_member_1: DiagnosticMessage;
+        File_0_is_not_a_module: DiagnosticMessage;
+        Cannot_find_module_0: DiagnosticMessage;
+        Module_0_has_already_exported_a_member_named_1_Consider_explicitly_re_exporting_to_resolve_the_ambiguity: DiagnosticMessage;
+        An_export_assignment_cannot_be_used_in_a_module_with_other_exported_elements: DiagnosticMessage;
+        Type_0_recursively_references_itself_as_a_base_type: DiagnosticMessage;
+        A_class_may_only_extend_another_class: DiagnosticMessage;
+        An_interface_may_only_extend_a_class_or_another_interface: DiagnosticMessage;
+        Type_parameter_0_has_a_circular_constraint: DiagnosticMessage;
+        Generic_type_0_requires_1_type_argument_s: DiagnosticMessage;
+        Type_0_is_not_generic: DiagnosticMessage;
+        Global_type_0_must_be_a_class_or_interface_type: DiagnosticMessage;
+        Global_type_0_must_have_1_type_parameter_s: DiagnosticMessage;
+        Cannot_find_global_type_0: DiagnosticMessage;
+        Named_property_0_of_types_1_and_2_are_not_identical: DiagnosticMessage;
+        Interface_0_cannot_simultaneously_extend_types_1_and_2: DiagnosticMessage;
+        Excessive_stack_depth_comparing_types_0_and_1: DiagnosticMessage;
+        Type_0_is_not_assignable_to_type_1: DiagnosticMessage;
+        Cannot_redeclare_exported_variable_0: DiagnosticMessage;
+        Property_0_is_missing_in_type_1: DiagnosticMessage;
+        Property_0_is_private_in_type_1_but_not_in_type_2: DiagnosticMessage;
+        Types_of_property_0_are_incompatible: DiagnosticMessage;
+        Property_0_is_optional_in_type_1_but_required_in_type_2: DiagnosticMessage;
+        Types_of_parameters_0_and_1_are_incompatible: DiagnosticMessage;
+        Index_signature_is_missing_in_type_0: DiagnosticMessage;
+        Index_signatures_are_incompatible: DiagnosticMessage;
+        this_cannot_be_referenced_in_a_module_or_namespace_body: DiagnosticMessage;
+        this_cannot_be_referenced_in_current_location: DiagnosticMessage;
+        this_cannot_be_referenced_in_constructor_arguments: DiagnosticMessage;
+        this_cannot_be_referenced_in_a_static_property_initializer: DiagnosticMessage;
+        super_can_only_be_referenced_in_a_derived_class: DiagnosticMessage;
+        super_cannot_be_referenced_in_constructor_arguments: DiagnosticMessage;
+        Super_calls_are_not_permitted_outside_constructors_or_in_nested_functions_inside_constructors: DiagnosticMessage;
+        super_property_access_is_permitted_only_in_a_constructor_member_function_or_member_accessor_of_a_derived_class: DiagnosticMessage;
+        Property_0_does_not_exist_on_type_1: DiagnosticMessage;
+        Only_public_and_protected_methods_of_the_base_class_are_accessible_via_the_super_keyword: DiagnosticMessage;
+        Property_0_is_private_and_only_accessible_within_class_1: DiagnosticMessage;
+        An_index_expression_argument_must_be_of_type_string_number_symbol_or_any: DiagnosticMessage;
+        This_syntax_requires_an_imported_helper_named_1_but_module_0_has_no_exported_member_1: DiagnosticMessage;
+        Type_0_does_not_satisfy_the_constraint_1: DiagnosticMessage;
+        Argument_of_type_0_is_not_assignable_to_parameter_of_type_1: DiagnosticMessage;
+        Call_target_does_not_contain_any_signatures: DiagnosticMessage;
+        Untyped_function_calls_may_not_accept_type_arguments: DiagnosticMessage;
+        Value_of_type_0_is_not_callable_Did_you_mean_to_include_new: DiagnosticMessage;
+        Cannot_invoke_an_expression_whose_type_lacks_a_call_signature_Type_0_has_no_compatible_call_signatures: DiagnosticMessage;
+        Only_a_void_function_can_be_called_with_the_new_keyword: DiagnosticMessage;
+        Cannot_use_new_with_an_expression_whose_type_lacks_a_call_or_construct_signature: DiagnosticMessage;
+        Type_0_cannot_be_converted_to_type_1: DiagnosticMessage;
+        Object_literal_may_only_specify_known_properties_and_0_does_not_exist_in_type_1: DiagnosticMessage;
+        This_syntax_requires_an_imported_helper_but_module_0_cannot_be_found: DiagnosticMessage;
+        A_function_whose_declared_type_is_neither_void_nor_any_must_return_a_value: DiagnosticMessage;
+        An_arithmetic_operand_must_be_of_type_any_number_or_an_enum_type: DiagnosticMessage;
+        The_operand_of_an_increment_or_decrement_operator_must_be_a_variable_or_a_property_access: DiagnosticMessage;
+        The_left_hand_side_of_an_instanceof_expression_must_be_of_type_any_an_object_type_or_a_type_parameter: DiagnosticMessage;
+        The_right_hand_side_of_an_instanceof_expression_must_be_of_type_any_or_of_a_type_assignable_to_the_Function_interface_type: DiagnosticMessage;
+        The_left_hand_side_of_an_in_expression_must_be_of_type_any_string_number_or_symbol: DiagnosticMessage;
+        The_right_hand_side_of_an_in_expression_must_be_of_type_any_an_object_type_or_a_type_parameter: DiagnosticMessage;
+        The_left_hand_side_of_an_arithmetic_operation_must_be_of_type_any_number_or_an_enum_type: DiagnosticMessage;
+        The_right_hand_side_of_an_arithmetic_operation_must_be_of_type_any_number_or_an_enum_type: DiagnosticMessage;
+        The_left_hand_side_of_an_assignment_expression_must_be_a_variable_or_a_property_access: DiagnosticMessage;
+        Operator_0_cannot_be_applied_to_types_1_and_2: DiagnosticMessage;
+        Function_lacks_ending_return_statement_and_return_type_does_not_include_undefined: DiagnosticMessage;
+        Type_parameter_name_cannot_be_0: DiagnosticMessage;
+        A_parameter_property_is_only_allowed_in_a_constructor_implementation: DiagnosticMessage;
+        A_rest_parameter_must_be_of_an_array_type: DiagnosticMessage;
+        A_parameter_initializer_is_only_allowed_in_a_function_or_constructor_implementation: DiagnosticMessage;
+        Parameter_0_cannot_be_referenced_in_its_initializer: DiagnosticMessage;
+        Initializer_of_parameter_0_cannot_reference_identifier_1_declared_after_it: DiagnosticMessage;
+        Duplicate_string_index_signature: DiagnosticMessage;
+        Duplicate_number_index_signature: DiagnosticMessage;
+        A_super_call_must_be_the_first_statement_in_the_constructor_when_a_class_contains_initialized_properties_or_has_parameter_properties: DiagnosticMessage;
+        Constructors_for_derived_classes_must_contain_a_super_call: DiagnosticMessage;
+        A_get_accessor_must_return_a_value: DiagnosticMessage;
+        Getter_and_setter_accessors_do_not_agree_in_visibility: DiagnosticMessage;
+        get_and_set_accessor_must_have_the_same_type: DiagnosticMessage;
+        A_signature_with_an_implementation_cannot_use_a_string_literal_type: DiagnosticMessage;
+        Specialized_overload_signature_is_not_assignable_to_any_non_specialized_signature: DiagnosticMessage;
+        Overload_signatures_must_all_be_exported_or_non_exported: DiagnosticMessage;
+        Overload_signatures_must_all_be_ambient_or_non_ambient: DiagnosticMessage;
+        Overload_signatures_must_all_be_public_private_or_protected: DiagnosticMessage;
+        Overload_signatures_must_all_be_optional_or_required: DiagnosticMessage;
+        Function_overload_must_be_static: DiagnosticMessage;
+        Function_overload_must_not_be_static: DiagnosticMessage;
+        Function_implementation_name_must_be_0: DiagnosticMessage;
+        Constructor_implementation_is_missing: DiagnosticMessage;
+        Function_implementation_is_missing_or_not_immediately_following_the_declaration: DiagnosticMessage;
+        Multiple_constructor_implementations_are_not_allowed: DiagnosticMessage;
+        Duplicate_function_implementation: DiagnosticMessage;
+        Overload_signature_is_not_compatible_with_function_implementation: DiagnosticMessage;
+        Individual_declarations_in_merged_declaration_0_must_be_all_exported_or_all_local: DiagnosticMessage;
+        Duplicate_identifier_arguments_Compiler_uses_arguments_to_initialize_rest_parameters: DiagnosticMessage;
+        Declaration_name_conflicts_with_built_in_global_identifier_0: DiagnosticMessage;
+        Duplicate_identifier_this_Compiler_uses_variable_declaration_this_to_capture_this_reference: DiagnosticMessage;
+        Expression_resolves_to_variable_declaration_this_that_compiler_uses_to_capture_this_reference: DiagnosticMessage;
+        Duplicate_identifier_super_Compiler_uses_super_to_capture_base_class_reference: DiagnosticMessage;
+        Expression_resolves_to_super_that_compiler_uses_to_capture_base_class_reference: DiagnosticMessage;
+        Subsequent_variable_declarations_must_have_the_same_type_Variable_0_must_be_of_type_1_but_here_has_type_2: DiagnosticMessage;
+        The_left_hand_side_of_a_for_in_statement_cannot_use_a_type_annotation: DiagnosticMessage;
+        The_left_hand_side_of_a_for_in_statement_must_be_of_type_string_or_any: DiagnosticMessage;
+        The_left_hand_side_of_a_for_in_statement_must_be_a_variable_or_a_property_access: DiagnosticMessage;
+        The_right_hand_side_of_a_for_in_statement_must_be_of_type_any_an_object_type_or_a_type_parameter_but_here_has_type_0: DiagnosticMessage;
+        Setters_cannot_return_a_value: DiagnosticMessage;
+        Return_type_of_constructor_signature_must_be_assignable_to_the_instance_type_of_the_class: DiagnosticMessage;
+        The_with_statement_is_not_supported_All_symbols_in_a_with_block_will_have_type_any: DiagnosticMessage;
+        Property_0_of_type_1_is_not_assignable_to_string_index_type_2: DiagnosticMessage;
+        Property_0_of_type_1_is_not_assignable_to_numeric_index_type_2: DiagnosticMessage;
+        Numeric_index_type_0_is_not_assignable_to_string_index_type_1: DiagnosticMessage;
+        Class_name_cannot_be_0: DiagnosticMessage;
+        Class_0_incorrectly_extends_base_class_1: DiagnosticMessage;
+        Property_0_in_type_1_is_not_assignable_to_the_same_property_in_base_type_2: DiagnosticMessage;
+        Class_static_side_0_incorrectly_extends_base_class_static_side_1: DiagnosticMessage;
+        Class_0_incorrectly_implements_interface_1: DiagnosticMessage;
+        A_class_may_only_implement_another_class_or_interface: DiagnosticMessage;
+        Class_0_defines_instance_member_function_1_but_extended_class_2_defines_it_as_instance_member_accessor: DiagnosticMessage;
+        Class_0_defines_instance_member_function_1_but_extended_class_2_defines_it_as_instance_member_property: DiagnosticMessage;
+        Class_0_defines_instance_member_property_1_but_extended_class_2_defines_it_as_instance_member_function: DiagnosticMessage;
+        Class_0_defines_instance_member_accessor_1_but_extended_class_2_defines_it_as_instance_member_function: DiagnosticMessage;
+        Interface_name_cannot_be_0: DiagnosticMessage;
+        All_declarations_of_0_must_have_identical_type_parameters: DiagnosticMessage;
+        Interface_0_incorrectly_extends_interface_1: DiagnosticMessage;
+        Enum_name_cannot_be_0: DiagnosticMessage;
+        In_an_enum_with_multiple_declarations_only_one_declaration_can_omit_an_initializer_for_its_first_enum_element: DiagnosticMessage;
+        A_namespace_declaration_cannot_be_in_a_different_file_from_a_class_or_function_with_which_it_is_merged: DiagnosticMessage;
+        A_namespace_declaration_cannot_be_located_prior_to_a_class_or_function_with_which_it_is_merged: DiagnosticMessage;
+        Ambient_modules_cannot_be_nested_in_other_modules_or_namespaces: DiagnosticMessage;
+        Ambient_module_declaration_cannot_specify_relative_module_name: DiagnosticMessage;
+        Module_0_is_hidden_by_a_local_declaration_with_the_same_name: DiagnosticMessage;
+        Import_name_cannot_be_0: DiagnosticMessage;
+        Import_or_export_declaration_in_an_ambient_module_declaration_cannot_reference_module_through_relative_module_name: DiagnosticMessage;
+        Import_declaration_conflicts_with_local_declaration_of_0: DiagnosticMessage;
+        Duplicate_identifier_0_Compiler_reserves_name_1_in_top_level_scope_of_a_module: DiagnosticMessage;
+        Types_have_separate_declarations_of_a_private_property_0: DiagnosticMessage;
+        Property_0_is_protected_but_type_1_is_not_a_class_derived_from_2: DiagnosticMessage;
+        Property_0_is_protected_in_type_1_but_public_in_type_2: DiagnosticMessage;
+        Property_0_is_protected_and_only_accessible_within_class_1_and_its_subclasses: DiagnosticMessage;
+        Property_0_is_protected_and_only_accessible_through_an_instance_of_class_1: DiagnosticMessage;
+        The_0_operator_is_not_allowed_for_boolean_types_Consider_using_1_instead: DiagnosticMessage;
+        Block_scoped_variable_0_used_before_its_declaration: DiagnosticMessage;
+        Class_0_used_before_its_declaration: DiagnosticMessage;
+        Enum_0_used_before_its_declaration: DiagnosticMessage;
+        Cannot_redeclare_block_scoped_variable_0: DiagnosticMessage;
+        An_enum_member_cannot_have_a_numeric_name: DiagnosticMessage;
+        The_type_argument_for_type_parameter_0_cannot_be_inferred_from_the_usage_Consider_specifying_the_type_arguments_explicitly: DiagnosticMessage;
+        Variable_0_is_used_before_being_assigned: DiagnosticMessage;
+        Type_argument_candidate_1_is_not_a_valid_type_argument_because_it_is_not_a_supertype_of_candidate_0: DiagnosticMessage;
+        Type_alias_0_circularly_references_itself: DiagnosticMessage;
+        Type_alias_name_cannot_be_0: DiagnosticMessage;
+        An_AMD_module_cannot_have_multiple_name_assignments: DiagnosticMessage;
+        Type_0_has_no_property_1_and_no_string_index_signature: DiagnosticMessage;
+        Type_0_has_no_property_1: DiagnosticMessage;
+        Type_0_is_not_an_array_type: DiagnosticMessage;
+        A_rest_element_must_be_last_in_a_destructuring_pattern: DiagnosticMessage;
+        A_binding_pattern_parameter_cannot_be_optional_in_an_implementation_signature: DiagnosticMessage;
+        A_computed_property_name_must_be_of_type_string_number_symbol_or_any: DiagnosticMessage;
+        this_cannot_be_referenced_in_a_computed_property_name: DiagnosticMessage;
+        super_cannot_be_referenced_in_a_computed_property_name: DiagnosticMessage;
+        A_computed_property_name_cannot_reference_a_type_parameter_from_its_containing_type: DiagnosticMessage;
+        Cannot_find_global_value_0: DiagnosticMessage;
+        The_0_operator_cannot_be_applied_to_type_symbol: DiagnosticMessage;
+        Symbol_reference_does_not_refer_to_the_global_Symbol_constructor_object: DiagnosticMessage;
+        A_computed_property_name_of_the_form_0_must_be_of_type_symbol: DiagnosticMessage;
+        Spread_operator_in_new_expressions_is_only_available_when_targeting_ECMAScript_5_and_higher: DiagnosticMessage;
+        Enum_declarations_must_all_be_const_or_non_const: DiagnosticMessage;
+        In_const_enum_declarations_member_initializer_must_be_constant_expression: DiagnosticMessage;
+        const_enums_can_only_be_used_in_property_or_index_access_expressions_or_the_right_hand_side_of_an_import_declaration_or_export_assignment_or_type_query: DiagnosticMessage;
+        A_const_enum_member_can_only_be_accessed_using_a_string_literal: DiagnosticMessage;
+        const_enum_member_initializer_was_evaluated_to_a_non_finite_value: DiagnosticMessage;
+        const_enum_member_initializer_was_evaluated_to_disallowed_value_NaN: DiagnosticMessage;
+        Property_0_does_not_exist_on_const_enum_1: DiagnosticMessage;
+        let_is_not_allowed_to_be_used_as_a_name_in_let_or_const_declarations: DiagnosticMessage;
+        Cannot_initialize_outer_scoped_variable_0_in_the_same_scope_as_block_scoped_declaration_1: DiagnosticMessage;
+        The_left_hand_side_of_a_for_of_statement_cannot_use_a_type_annotation: DiagnosticMessage;
+        Export_declaration_conflicts_with_exported_declaration_of_0: DiagnosticMessage;
+        The_left_hand_side_of_a_for_of_statement_must_be_a_variable_or_a_property_access: DiagnosticMessage;
+        Type_0_must_have_a_Symbol_iterator_method_that_returns_an_iterator: DiagnosticMessage;
+        An_iterator_must_have_a_next_method: DiagnosticMessage;
+        The_type_returned_by_the_next_method_of_an_iterator_must_have_a_value_property: DiagnosticMessage;
+        The_left_hand_side_of_a_for_in_statement_cannot_be_a_destructuring_pattern: DiagnosticMessage;
+        Cannot_redeclare_identifier_0_in_catch_clause: DiagnosticMessage;
+        Tuple_type_0_with_length_1_cannot_be_assigned_to_tuple_with_length_2: DiagnosticMessage;
+        Using_a_string_in_a_for_of_statement_is_only_supported_in_ECMAScript_5_and_higher: DiagnosticMessage;
+        Type_0_is_not_an_array_type_or_a_string_type: DiagnosticMessage;
+        The_arguments_object_cannot_be_referenced_in_an_arrow_function_in_ES3_and_ES5_Consider_using_a_standard_function_expression: DiagnosticMessage;
+        Module_0_resolves_to_a_non_module_entity_and_cannot_be_imported_using_this_construct: DiagnosticMessage;
+        Module_0_uses_export_and_cannot_be_used_with_export_Asterisk: DiagnosticMessage;
+        An_interface_can_only_extend_an_identifier_Slashqualified_name_with_optional_type_arguments: DiagnosticMessage;
+        A_class_can_only_implement_an_identifier_Slashqualified_name_with_optional_type_arguments: DiagnosticMessage;
+        A_rest_element_cannot_contain_a_binding_pattern: DiagnosticMessage;
+        _0_is_referenced_directly_or_indirectly_in_its_own_type_annotation: DiagnosticMessage;
+        Cannot_find_namespace_0: DiagnosticMessage;
+        Type_0_must_have_a_Symbol_asyncIterator_method_that_returns_an_async_iterator: DiagnosticMessage;
+        A_generator_cannot_have_a_void_type_annotation: DiagnosticMessage;
+        _0_is_referenced_directly_or_indirectly_in_its_own_base_expression: DiagnosticMessage;
+        Type_0_is_not_a_constructor_function_type: DiagnosticMessage;
+        No_base_constructor_has_the_specified_number_of_type_arguments: DiagnosticMessage;
+        Base_constructor_return_type_0_is_not_a_class_or_interface_type: DiagnosticMessage;
+        Base_constructors_must_all_have_the_same_return_type: DiagnosticMessage;
+        Cannot_create_an_instance_of_an_abstract_class: DiagnosticMessage;
+        Overload_signatures_must_all_be_abstract_or_non_abstract: DiagnosticMessage;
+        Abstract_method_0_in_class_1_cannot_be_accessed_via_super_expression: DiagnosticMessage;
+        Classes_containing_abstract_methods_must_be_marked_abstract: DiagnosticMessage;
+        Non_abstract_class_0_does_not_implement_inherited_abstract_member_1_from_class_2: DiagnosticMessage;
+        All_declarations_of_an_abstract_method_must_be_consecutive: DiagnosticMessage;
+        Cannot_assign_an_abstract_constructor_type_to_a_non_abstract_constructor_type: DiagnosticMessage;
+        A_this_based_type_guard_is_not_compatible_with_a_parameter_based_type_guard: DiagnosticMessage;
+        An_async_iterator_must_have_a_next_method: DiagnosticMessage;
+        Duplicate_identifier_0_Compiler_uses_declaration_1_to_support_async_functions: DiagnosticMessage;
+        Expression_resolves_to_variable_declaration_0_that_compiler_uses_to_support_async_functions: DiagnosticMessage;
+        The_arguments_object_cannot_be_referenced_in_an_async_function_or_method_in_ES3_and_ES5_Consider_using_a_standard_function_or_method: DiagnosticMessage;
+        yield_expressions_cannot_be_used_in_a_parameter_initializer: DiagnosticMessage;
+        await_expressions_cannot_be_used_in_a_parameter_initializer: DiagnosticMessage;
+        Initializer_provides_no_value_for_this_binding_element_and_the_binding_element_has_no_default_value: DiagnosticMessage;
+        A_this_type_is_available_only_in_a_non_static_member_of_a_class_or_interface: DiagnosticMessage;
+        The_inferred_type_of_0_references_an_inaccessible_1_type_A_type_annotation_is_necessary: DiagnosticMessage;
+        A_module_cannot_have_multiple_default_exports: DiagnosticMessage;
+        Duplicate_identifier_0_Compiler_reserves_name_1_in_top_level_scope_of_a_module_containing_async_functions: DiagnosticMessage;
+        Property_0_is_incompatible_with_index_signature: DiagnosticMessage;
+        Object_is_possibly_null: DiagnosticMessage;
+        Object_is_possibly_undefined: DiagnosticMessage;
+        Object_is_possibly_null_or_undefined: DiagnosticMessage;
+        A_function_returning_never_cannot_have_a_reachable_end_point: DiagnosticMessage;
+        Enum_type_0_has_members_with_initializers_that_are_not_literals: DiagnosticMessage;
+        Type_0_cannot_be_used_to_index_type_1: DiagnosticMessage;
+        Type_0_has_no_matching_index_signature_for_type_1: DiagnosticMessage;
+        Type_0_cannot_be_used_as_an_index_type: DiagnosticMessage;
+        Cannot_assign_to_0_because_it_is_not_a_variable: DiagnosticMessage;
+        Cannot_assign_to_0_because_it_is_a_constant_or_a_read_only_property: DiagnosticMessage;
+        The_target_of_an_assignment_must_be_a_variable_or_a_property_access: DiagnosticMessage;
+        Index_signature_in_type_0_only_permits_reading: DiagnosticMessage;
+        Duplicate_identifier_newTarget_Compiler_uses_variable_declaration_newTarget_to_capture_new_target_meta_property_reference: DiagnosticMessage;
+        Expression_resolves_to_variable_declaration_newTarget_that_compiler_uses_to_capture_new_target_meta_property_reference: DiagnosticMessage;
+        A_mixin_class_must_have_a_constructor_with_a_single_rest_parameter_of_type_any: DiagnosticMessage;
+        Property_0_has_conflicting_declarations_and_is_inaccessible_in_type_1: DiagnosticMessage;
+        The_type_returned_by_the_next_method_of_an_async_iterator_must_be_a_promise_for_a_type_with_a_value_property: DiagnosticMessage;
+        Type_0_is_not_an_array_type_or_does_not_have_a_Symbol_iterator_method_that_returns_an_iterator: DiagnosticMessage;
+        Type_0_is_not_an_array_type_or_a_string_type_or_does_not_have_a_Symbol_iterator_method_that_returns_an_iterator: DiagnosticMessage;
+        Generic_type_instantiation_is_excessively_deep_and_possibly_infinite: DiagnosticMessage;
+        Property_0_does_not_exist_on_type_1_Did_you_mean_2: DiagnosticMessage;
+        Cannot_find_name_0_Did_you_mean_1: DiagnosticMessage;
+        Computed_values_are_not_permitted_in_an_enum_with_string_valued_members: DiagnosticMessage;
+        Expected_0_arguments_but_got_1: DiagnosticMessage;
+        Expected_at_least_0_arguments_but_got_1: DiagnosticMessage;
+        Expected_0_arguments_but_got_1_or_more: DiagnosticMessage;
+        Expected_at_least_0_arguments_but_got_1_or_more: DiagnosticMessage;
+        Expected_0_type_arguments_but_got_1: DiagnosticMessage;
+        Type_0_has_no_properties_in_common_with_type_1: DiagnosticMessage;
+        Value_of_type_0_has_no_properties_in_common_with_type_1_Did_you_mean_to_call_it: DiagnosticMessage;
+        Object_literal_may_only_specify_known_properties_but_0_does_not_exist_in_type_1_Did_you_mean_to_write_2: DiagnosticMessage;
+        Base_class_expressions_cannot_reference_class_type_parameters: DiagnosticMessage;
+        The_containing_function_or_module_body_is_too_large_for_control_flow_analysis: DiagnosticMessage;
+        Property_0_has_no_initializer_and_is_not_definitely_assigned_in_the_constructor: DiagnosticMessage;
+        Property_0_is_used_before_being_assigned: DiagnosticMessage;
+        A_rest_element_cannot_have_a_property_name: DiagnosticMessage;
+        Enum_declarations_can_only_merge_with_namespace_or_other_enum_declarations: DiagnosticMessage;
+        Type_0_is_not_an_array_type_Use_compiler_option_downlevelIteration_to_allow_iterating_of_iterators: DiagnosticMessage;
+        Type_0_is_not_an_array_type_or_a_string_type_Use_compiler_option_downlevelIteration_to_allow_iterating_of_iterators: DiagnosticMessage;
+        Property_0_does_not_exist_on_type_1_Did_you_forget_to_use_await: DiagnosticMessage;
+        Object_is_of_type_unknown: DiagnosticMessage;
+        JSX_element_attributes_type_0_may_not_be_a_union_type: DiagnosticMessage;
+        The_return_type_of_a_JSX_element_constructor_must_return_an_object_type: DiagnosticMessage;
+        JSX_element_implicitly_has_type_any_because_the_global_type_JSX_Element_does_not_exist: DiagnosticMessage;
+        Property_0_in_type_1_is_not_assignable_to_type_2: DiagnosticMessage;
+        JSX_element_type_0_does_not_have_any_construct_or_call_signatures: DiagnosticMessage;
+        JSX_element_type_0_is_not_a_constructor_function_for_JSX_elements: DiagnosticMessage;
+        Property_0_of_JSX_spread_attribute_is_not_assignable_to_target_property: DiagnosticMessage;
+        JSX_element_class_does_not_support_attributes_because_it_does_not_have_a_0_property: DiagnosticMessage;
+        The_global_type_JSX_0_may_not_have_more_than_one_property: DiagnosticMessage;
+        JSX_spread_child_must_be_an_array_type: DiagnosticMessage;
+        Cannot_augment_module_0_with_value_exports_because_it_resolves_to_a_non_module_entity: DiagnosticMessage;
+        A_member_initializer_in_a_enum_declaration_cannot_reference_members_declared_after_it_including_members_defined_in_other_enums: DiagnosticMessage;
+        Merged_declaration_0_cannot_include_a_default_export_declaration_Consider_adding_a_separate_export_default_0_declaration_instead: DiagnosticMessage;
+        Non_abstract_class_expression_does_not_implement_inherited_abstract_member_0_from_class_1: DiagnosticMessage;
+        Exported_external_package_typings_file_cannot_contain_tripleslash_references_Please_contact_the_package_author_to_update_the_package_definition: DiagnosticMessage;
+        Exported_external_package_typings_file_0_is_not_a_module_Please_contact_the_package_author_to_update_the_package_definition: DiagnosticMessage;
+        JSX_expressions_must_have_one_parent_element: DiagnosticMessage;
+        Type_0_provides_no_match_for_the_signature_1: DiagnosticMessage;
+        super_is_only_allowed_in_members_of_object_literal_expressions_when_option_target_is_ES2015_or_higher: DiagnosticMessage;
+        super_can_only_be_referenced_in_members_of_derived_classes_or_object_literal_expressions: DiagnosticMessage;
+        Cannot_export_0_Only_local_declarations_can_be_exported_from_a_module: DiagnosticMessage;
+        Cannot_find_name_0_Did_you_mean_the_static_member_1_0: DiagnosticMessage;
+        Cannot_find_name_0_Did_you_mean_the_instance_member_this_0: DiagnosticMessage;
+        Invalid_module_name_in_augmentation_module_0_cannot_be_found: DiagnosticMessage;
+        Invalid_module_name_in_augmentation_Module_0_resolves_to_an_untyped_module_at_1_which_cannot_be_augmented: DiagnosticMessage;
+        Exports_and_export_assignments_are_not_permitted_in_module_augmentations: DiagnosticMessage;
+        Imports_are_not_permitted_in_module_augmentations_Consider_moving_them_to_the_enclosing_external_module: DiagnosticMessage;
+        export_modifier_cannot_be_applied_to_ambient_modules_and_module_augmentations_since_they_are_always_visible: DiagnosticMessage;
+        Augmentations_for_the_global_scope_can_only_be_directly_nested_in_external_modules_or_ambient_module_declarations: DiagnosticMessage;
+        Augmentations_for_the_global_scope_should_have_declare_modifier_unless_they_appear_in_already_ambient_context: DiagnosticMessage;
+        Cannot_augment_module_0_because_it_resolves_to_a_non_module_entity: DiagnosticMessage;
+        Cannot_assign_a_0_constructor_type_to_a_1_constructor_type: DiagnosticMessage;
+        Constructor_of_class_0_is_private_and_only_accessible_within_the_class_declaration: DiagnosticMessage;
+        Constructor_of_class_0_is_protected_and_only_accessible_within_the_class_declaration: DiagnosticMessage;
+        Cannot_extend_a_class_0_Class_constructor_is_marked_as_private: DiagnosticMessage;
+        Accessors_must_both_be_abstract_or_non_abstract: DiagnosticMessage;
+        A_type_predicate_s_type_must_be_assignable_to_its_parameter_s_type: DiagnosticMessage;
+        Type_0_is_not_comparable_to_type_1: DiagnosticMessage;
+        A_function_that_is_called_with_the_new_keyword_cannot_have_a_this_type_that_is_void: DiagnosticMessage;
+        A_0_parameter_must_be_the_first_parameter: DiagnosticMessage;
+        A_constructor_cannot_have_a_this_parameter: DiagnosticMessage;
+        get_and_set_accessor_must_have_the_same_this_type: DiagnosticMessage;
+        this_implicitly_has_type_any_because_it_does_not_have_a_type_annotation: DiagnosticMessage;
+        The_this_context_of_type_0_is_not_assignable_to_method_s_this_of_type_1: DiagnosticMessage;
+        The_this_types_of_each_signature_are_incompatible: DiagnosticMessage;
+        _0_refers_to_a_UMD_global_but_the_current_file_is_a_module_Consider_adding_an_import_instead: DiagnosticMessage;
+        All_declarations_of_0_must_have_identical_modifiers: DiagnosticMessage;
+        Cannot_find_type_definition_file_for_0: DiagnosticMessage;
+        Cannot_extend_an_interface_0_Did_you_mean_implements: DiagnosticMessage;
+        An_import_path_cannot_end_with_a_0_extension_Consider_importing_1_instead: DiagnosticMessage;
+        _0_is_a_primitive_but_1_is_a_wrapper_object_Prefer_using_0_when_possible: DiagnosticMessage;
+        _0_only_refers_to_a_type_but_is_being_used_as_a_value_here: DiagnosticMessage;
+        Namespace_0_has_no_exported_member_1: DiagnosticMessage;
+        Left_side_of_comma_operator_is_unused_and_has_no_side_effects: DiagnosticMessage;
+        The_Object_type_is_assignable_to_very_few_other_types_Did_you_mean_to_use_the_any_type_instead: DiagnosticMessage;
+        An_async_function_or_method_must_return_a_Promise_Make_sure_you_have_a_declaration_for_Promise_or_include_ES2015_in_your_lib_option: DiagnosticMessage;
+        Spread_types_may_only_be_created_from_object_types: DiagnosticMessage;
+        Static_property_0_conflicts_with_built_in_property_Function_0_of_constructor_function_1: DiagnosticMessage;
+        Rest_types_may_only_be_created_from_object_types: DiagnosticMessage;
+        The_target_of_an_object_rest_assignment_must_be_a_variable_or_a_property_access: DiagnosticMessage;
+        _0_only_refers_to_a_type_but_is_being_used_as_a_namespace_here: DiagnosticMessage;
+        The_operand_of_a_delete_operator_must_be_a_property_reference: DiagnosticMessage;
+        The_operand_of_a_delete_operator_cannot_be_a_read_only_property: DiagnosticMessage;
+        An_async_function_or_method_in_ES5_SlashES3_requires_the_Promise_constructor_Make_sure_you_have_a_declaration_for_the_Promise_constructor_or_include_ES2015_in_your_lib_option: DiagnosticMessage;
+        Required_type_parameters_may_not_follow_optional_type_parameters: DiagnosticMessage;
+        Generic_type_0_requires_between_1_and_2_type_arguments: DiagnosticMessage;
+        Cannot_use_namespace_0_as_a_value: DiagnosticMessage;
+        Cannot_use_namespace_0_as_a_type: DiagnosticMessage;
+        _0_are_specified_twice_The_attribute_named_0_will_be_overwritten: DiagnosticMessage;
+        A_dynamic_import_call_returns_a_Promise_Make_sure_you_have_a_declaration_for_Promise_or_include_ES2015_in_your_lib_option: DiagnosticMessage;
+        A_dynamic_import_call_in_ES5_SlashES3_requires_the_Promise_constructor_Make_sure_you_have_a_declaration_for_the_Promise_constructor_or_include_ES2015_in_your_lib_option: DiagnosticMessage;
+        Cannot_access_0_1_because_0_is_a_type_but_not_a_namespace_Did_you_mean_to_retrieve_the_type_of_the_property_1_in_0_with_0_1: DiagnosticMessage;
+        The_expression_of_an_export_assignment_must_be_an_identifier_or_qualified_name_in_an_ambient_context: DiagnosticMessage;
+        Abstract_property_0_in_class_1_cannot_be_accessed_in_the_constructor: DiagnosticMessage;
+        Type_parameter_0_has_a_circular_default: DiagnosticMessage;
+        Subsequent_property_declarations_must_have_the_same_type_Property_0_must_be_of_type_1_but_here_has_type_2: DiagnosticMessage;
+        Duplicate_declaration_0: DiagnosticMessage;
+        Type_0_is_not_assignable_to_type_1_Two_different_types_with_this_name_exist_but_they_are_unrelated: DiagnosticMessage;
+        Class_0_incorrectly_implements_class_1_Did_you_mean_to_extend_1_and_inherit_its_members_as_a_subclass: DiagnosticMessage;
+        Cannot_invoke_an_object_which_is_possibly_null: DiagnosticMessage;
+        Cannot_invoke_an_object_which_is_possibly_undefined: DiagnosticMessage;
+        Cannot_invoke_an_object_which_is_possibly_null_or_undefined: DiagnosticMessage;
+        Module_0_has_no_exported_member_1_Did_you_mean_2: DiagnosticMessage;
+        Class_name_cannot_be_Object_when_targeting_ES5_with_module_0: DiagnosticMessage;
+        Cannot_find_lib_definition_for_0: DiagnosticMessage;
+        Cannot_find_lib_definition_for_0_Did_you_mean_1: DiagnosticMessage;
+        Import_declaration_0_is_using_private_name_1: DiagnosticMessage;
+        Type_parameter_0_of_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
+        Type_parameter_0_of_exported_interface_has_or_is_using_private_name_1: DiagnosticMessage;
+        Type_parameter_0_of_constructor_signature_from_exported_interface_has_or_is_using_private_name_1: DiagnosticMessage;
+        Type_parameter_0_of_call_signature_from_exported_interface_has_or_is_using_private_name_1: DiagnosticMessage;
+        Type_parameter_0_of_public_static_method_from_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
+        Type_parameter_0_of_public_method_from_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
+        Type_parameter_0_of_method_from_exported_interface_has_or_is_using_private_name_1: DiagnosticMessage;
+        Type_parameter_0_of_exported_function_has_or_is_using_private_name_1: DiagnosticMessage;
+        Implements_clause_of_exported_class_0_has_or_is_using_private_name_1: DiagnosticMessage;
+        extends_clause_of_exported_class_0_has_or_is_using_private_name_1: DiagnosticMessage;
+        extends_clause_of_exported_interface_0_has_or_is_using_private_name_1: DiagnosticMessage;
+        Exported_variable_0_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: DiagnosticMessage;
+        Exported_variable_0_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Exported_variable_0_has_or_is_using_private_name_1: DiagnosticMessage;
+        Public_static_property_0_of_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: DiagnosticMessage;
+        Public_static_property_0_of_exported_class_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Public_static_property_0_of_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
+        Public_property_0_of_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: DiagnosticMessage;
+        Public_property_0_of_exported_class_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Public_property_0_of_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
+        Property_0_of_exported_interface_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Property_0_of_exported_interface_has_or_is_using_private_name_1: DiagnosticMessage;
+        Parameter_type_of_public_static_setter_0_from_exported_class_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Parameter_type_of_public_static_setter_0_from_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
+        Parameter_type_of_public_setter_0_from_exported_class_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Parameter_type_of_public_setter_0_from_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
+        Return_type_of_public_static_getter_0_from_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: DiagnosticMessage;
+        Return_type_of_public_static_getter_0_from_exported_class_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Return_type_of_public_static_getter_0_from_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
+        Return_type_of_public_getter_0_from_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: DiagnosticMessage;
+        Return_type_of_public_getter_0_from_exported_class_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Return_type_of_public_getter_0_from_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
+        Return_type_of_constructor_signature_from_exported_interface_has_or_is_using_name_0_from_private_module_1: DiagnosticMessage;
+        Return_type_of_constructor_signature_from_exported_interface_has_or_is_using_private_name_0: DiagnosticMessage;
+        Return_type_of_call_signature_from_exported_interface_has_or_is_using_name_0_from_private_module_1: DiagnosticMessage;
+        Return_type_of_call_signature_from_exported_interface_has_or_is_using_private_name_0: DiagnosticMessage;
+        Return_type_of_index_signature_from_exported_interface_has_or_is_using_name_0_from_private_module_1: DiagnosticMessage;
+        Return_type_of_index_signature_from_exported_interface_has_or_is_using_private_name_0: DiagnosticMessage;
+        Return_type_of_public_static_method_from_exported_class_has_or_is_using_name_0_from_external_module_1_but_cannot_be_named: DiagnosticMessage;
+        Return_type_of_public_static_method_from_exported_class_has_or_is_using_name_0_from_private_module_1: DiagnosticMessage;
+        Return_type_of_public_static_method_from_exported_class_has_or_is_using_private_name_0: DiagnosticMessage;
+        Return_type_of_public_method_from_exported_class_has_or_is_using_name_0_from_external_module_1_but_cannot_be_named: DiagnosticMessage;
+        Return_type_of_public_method_from_exported_class_has_or_is_using_name_0_from_private_module_1: DiagnosticMessage;
+        Return_type_of_public_method_from_exported_class_has_or_is_using_private_name_0: DiagnosticMessage;
+        Return_type_of_method_from_exported_interface_has_or_is_using_name_0_from_private_module_1: DiagnosticMessage;
+        Return_type_of_method_from_exported_interface_has_or_is_using_private_name_0: DiagnosticMessage;
+        Return_type_of_exported_function_has_or_is_using_name_0_from_external_module_1_but_cannot_be_named: DiagnosticMessage;
+        Return_type_of_exported_function_has_or_is_using_name_0_from_private_module_1: DiagnosticMessage;
+        Return_type_of_exported_function_has_or_is_using_private_name_0: DiagnosticMessage;
+        Parameter_0_of_constructor_from_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: DiagnosticMessage;
+        Parameter_0_of_constructor_from_exported_class_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Parameter_0_of_constructor_from_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
+        Parameter_0_of_constructor_signature_from_exported_interface_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Parameter_0_of_constructor_signature_from_exported_interface_has_or_is_using_private_name_1: DiagnosticMessage;
+        Parameter_0_of_call_signature_from_exported_interface_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Parameter_0_of_call_signature_from_exported_interface_has_or_is_using_private_name_1: DiagnosticMessage;
+        Parameter_0_of_public_static_method_from_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: DiagnosticMessage;
+        Parameter_0_of_public_static_method_from_exported_class_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Parameter_0_of_public_static_method_from_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
+        Parameter_0_of_public_method_from_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: DiagnosticMessage;
+        Parameter_0_of_public_method_from_exported_class_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Parameter_0_of_public_method_from_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
+        Parameter_0_of_method_from_exported_interface_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Parameter_0_of_method_from_exported_interface_has_or_is_using_private_name_1: DiagnosticMessage;
+        Parameter_0_of_exported_function_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: DiagnosticMessage;
+        Parameter_0_of_exported_function_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Parameter_0_of_exported_function_has_or_is_using_private_name_1: DiagnosticMessage;
+        Exported_type_alias_0_has_or_is_using_private_name_1: DiagnosticMessage;
+        Default_export_of_the_module_has_or_is_using_private_name_0: DiagnosticMessage;
+        Type_parameter_0_of_exported_type_alias_has_or_is_using_private_name_1: DiagnosticMessage;
+        Conflicting_definitions_for_0_found_at_1_and_2_Consider_installing_a_specific_version_of_this_library_to_resolve_the_conflict: DiagnosticMessage;
+        Parameter_0_of_index_signature_from_exported_interface_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Parameter_0_of_index_signature_from_exported_interface_has_or_is_using_private_name_1: DiagnosticMessage;
+        Property_0_of_exported_class_expression_may_not_be_private_or_protected: DiagnosticMessage;
+        Public_static_method_0_of_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: DiagnosticMessage;
+        Public_static_method_0_of_exported_class_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Public_static_method_0_of_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
+        Public_method_0_of_exported_class_has_or_is_using_name_1_from_external_module_2_but_cannot_be_named: DiagnosticMessage;
+        Public_method_0_of_exported_class_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Public_method_0_of_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
+        Method_0_of_exported_interface_has_or_is_using_name_1_from_private_module_2: DiagnosticMessage;
+        Method_0_of_exported_interface_has_or_is_using_private_name_1: DiagnosticMessage;
+        The_current_host_does_not_support_the_0_option: DiagnosticMessage;
+        Cannot_find_the_common_subdirectory_path_for_the_input_files: DiagnosticMessage;
+        File_specification_cannot_end_in_a_recursive_directory_wildcard_Asterisk_Asterisk_Colon_0: DiagnosticMessage;
+        Cannot_read_file_0_Colon_1: DiagnosticMessage;
+        Failed_to_parse_file_0_Colon_1: DiagnosticMessage;
+        Unknown_compiler_option_0: DiagnosticMessage;
+        Compiler_option_0_requires_a_value_of_type_1: DiagnosticMessage;
+        Could_not_write_file_0_Colon_1: DiagnosticMessage;
+        Option_project_cannot_be_mixed_with_source_files_on_a_command_line: DiagnosticMessage;
+        Option_isolatedModules_can_only_be_used_when_either_option_module_is_provided_or_option_target_is_ES2015_or_higher: DiagnosticMessage;
+        Option_0_can_only_be_used_when_either_option_inlineSourceMap_or_option_sourceMap_is_provided: DiagnosticMessage;
+        Option_0_cannot_be_specified_without_specifying_option_1: DiagnosticMessage;
+        Option_0_cannot_be_specified_with_option_1: DiagnosticMessage;
+        A_tsconfig_json_file_is_already_defined_at_Colon_0: DiagnosticMessage;
+        Cannot_write_file_0_because_it_would_overwrite_input_file: DiagnosticMessage;
+        Cannot_write_file_0_because_it_would_be_overwritten_by_multiple_input_files: DiagnosticMessage;
+        Cannot_find_a_tsconfig_json_file_at_the_specified_directory_Colon_0: DiagnosticMessage;
+        The_specified_path_does_not_exist_Colon_0: DiagnosticMessage;
+        Invalid_value_for_reactNamespace_0_is_not_a_valid_identifier: DiagnosticMessage;
+        Option_paths_cannot_be_used_without_specifying_baseUrl_option: DiagnosticMessage;
+        Pattern_0_can_have_at_most_one_Asterisk_character: DiagnosticMessage;
+        Substitution_0_in_pattern_1_in_can_have_at_most_one_Asterisk_character: DiagnosticMessage;
+        Substitutions_for_pattern_0_should_be_an_array: DiagnosticMessage;
+        Substitution_0_for_pattern_1_has_incorrect_type_expected_string_got_2: DiagnosticMessage;
+        File_specification_cannot_contain_a_parent_directory_that_appears_after_a_recursive_directory_wildcard_Asterisk_Asterisk_Colon_0: DiagnosticMessage;
+        Substitutions_for_pattern_0_shouldn_t_be_an_empty_array: DiagnosticMessage;
+        Invalid_value_for_jsxFactory_0_is_not_a_valid_identifier_or_qualified_name: DiagnosticMessage;
+        Adding_a_tsconfig_json_file_will_help_organize_projects_that_contain_both_TypeScript_and_JavaScript_files_Learn_more_at_https_Colon_Slash_Slashaka_ms_Slashtsconfig: DiagnosticMessage;
+        Option_0_cannot_be_specified_without_specifying_option_1_or_option_2: DiagnosticMessage;
+        Option_resolveJsonModule_cannot_be_specified_without_node_module_resolution_strategy: DiagnosticMessage;
+        Generates_a_sourcemap_for_each_corresponding_d_ts_file: DiagnosticMessage;
+        Concatenate_and_emit_output_to_single_file: DiagnosticMessage;
+        Generates_corresponding_d_ts_file: DiagnosticMessage;
+        Specify_the_location_where_debugger_should_locate_map_files_instead_of_generated_locations: DiagnosticMessage;
+        Specify_the_location_where_debugger_should_locate_TypeScript_files_instead_of_source_locations: DiagnosticMessage;
+        Watch_input_files: DiagnosticMessage;
+        Redirect_output_structure_to_the_directory: DiagnosticMessage;
+        Do_not_erase_const_enum_declarations_in_generated_code: DiagnosticMessage;
+        Do_not_emit_outputs_if_any_errors_were_reported: DiagnosticMessage;
+        Do_not_emit_comments_to_output: DiagnosticMessage;
+        Do_not_emit_outputs: DiagnosticMessage;
+        Allow_default_imports_from_modules_with_no_default_export_This_does_not_affect_code_emit_just_typechecking: DiagnosticMessage;
+        Skip_type_checking_of_declaration_files: DiagnosticMessage;
+        Do_not_resolve_the_real_path_of_symlinks: DiagnosticMessage;
+        Only_emit_d_ts_declaration_files: DiagnosticMessage;
+        Specify_ECMAScript_target_version_Colon_ES3_default_ES5_ES2015_ES2016_ES2017_ES2018_or_ESNEXT: DiagnosticMessage;
+        Specify_module_code_generation_Colon_none_commonjs_amd_system_umd_es2015_or_ESNext: DiagnosticMessage;
+        Print_this_message: DiagnosticMessage;
+        Print_the_compiler_s_version: DiagnosticMessage;
+        Compile_the_project_given_the_path_to_its_configuration_file_or_to_a_folder_with_a_tsconfig_json: DiagnosticMessage;
+        Syntax_Colon_0: DiagnosticMessage;
+        options: DiagnosticMessage;
+        file: DiagnosticMessage;
+        Examples_Colon_0: DiagnosticMessage;
+        Options_Colon: DiagnosticMessage;
+        Version_0: DiagnosticMessage;
+        Insert_command_line_options_and_files_from_a_file: DiagnosticMessage;
+        Starting_compilation_in_watch_mode: DiagnosticMessage;
+        File_change_detected_Starting_incremental_compilation: DiagnosticMessage;
+        KIND: DiagnosticMessage;
+        FILE: DiagnosticMessage;
+        VERSION: DiagnosticMessage;
+        LOCATION: DiagnosticMessage;
+        DIRECTORY: DiagnosticMessage;
+        STRATEGY: DiagnosticMessage;
+        FILE_OR_DIRECTORY: DiagnosticMessage;
+        Generates_corresponding_map_file: DiagnosticMessage;
+        Compiler_option_0_expects_an_argument: DiagnosticMessage;
+        Unterminated_quoted_string_in_response_file_0: DiagnosticMessage;
+        Argument_for_0_option_must_be_Colon_1: DiagnosticMessage;
+        Locale_must_be_of_the_form_language_or_language_territory_For_example_0_or_1: DiagnosticMessage;
+        Unsupported_locale_0: DiagnosticMessage;
+        Unable_to_open_file_0: DiagnosticMessage;
+        Corrupted_locale_file_0: DiagnosticMessage;
+        Raise_error_on_expressions_and_declarations_with_an_implied_any_type: DiagnosticMessage;
+        File_0_not_found: DiagnosticMessage;
+        File_0_has_unsupported_extension_The_only_supported_extensions_are_1: DiagnosticMessage;
+        Suppress_noImplicitAny_errors_for_indexing_objects_lacking_index_signatures: DiagnosticMessage;
+        Do_not_emit_declarations_for_code_that_has_an_internal_annotation: DiagnosticMessage;
+        Specify_the_root_directory_of_input_files_Use_to_control_the_output_directory_structure_with_outDir: DiagnosticMessage;
+        File_0_is_not_under_rootDir_1_rootDir_is_expected_to_contain_all_source_files: DiagnosticMessage;
+        Specify_the_end_of_line_sequence_to_be_used_when_emitting_files_Colon_CRLF_dos_or_LF_unix: DiagnosticMessage;
+        NEWLINE: DiagnosticMessage;
+        Option_0_can_only_be_specified_in_tsconfig_json_file: DiagnosticMessage;
+        Enables_experimental_support_for_ES7_decorators: DiagnosticMessage;
+        Enables_experimental_support_for_emitting_type_metadata_for_decorators: DiagnosticMessage;
+        Enables_experimental_support_for_ES7_async_functions: DiagnosticMessage;
+        Specify_module_resolution_strategy_Colon_node_Node_js_or_classic_TypeScript_pre_1_6: DiagnosticMessage;
+        Initializes_a_TypeScript_project_and_creates_a_tsconfig_json_file: DiagnosticMessage;
+        Successfully_created_a_tsconfig_json_file: DiagnosticMessage;
+        Suppress_excess_property_checks_for_object_literals: DiagnosticMessage;
+        Stylize_errors_and_messages_using_color_and_context_experimental: DiagnosticMessage;
+        Do_not_report_errors_on_unused_labels: DiagnosticMessage;
+        Report_error_when_not_all_code_paths_in_function_return_a_value: DiagnosticMessage;
+        Report_errors_for_fallthrough_cases_in_switch_statement: DiagnosticMessage;
+        Do_not_report_errors_on_unreachable_code: DiagnosticMessage;
+        Disallow_inconsistently_cased_references_to_the_same_file: DiagnosticMessage;
+        Specify_library_files_to_be_included_in_the_compilation: DiagnosticMessage;
+        Specify_JSX_code_generation_Colon_preserve_react_native_or_react: DiagnosticMessage;
+        File_0_has_an_unsupported_extension_so_skipping_it: DiagnosticMessage;
+        Only_amd_and_system_modules_are_supported_alongside_0: DiagnosticMessage;
+        Base_directory_to_resolve_non_absolute_module_names: DiagnosticMessage;
+        Deprecated_Use_jsxFactory_instead_Specify_the_object_invoked_for_createElement_when_targeting_react_JSX_emit: DiagnosticMessage;
+        Enable_tracing_of_the_name_resolution_process: DiagnosticMessage;
+        Resolving_module_0_from_1: DiagnosticMessage;
+        Explicitly_specified_module_resolution_kind_Colon_0: DiagnosticMessage;
+        Module_resolution_kind_is_not_specified_using_0: DiagnosticMessage;
+        Module_name_0_was_successfully_resolved_to_1: DiagnosticMessage;
+        Module_name_0_was_not_resolved: DiagnosticMessage;
+        paths_option_is_specified_looking_for_a_pattern_to_match_module_name_0: DiagnosticMessage;
+        Module_name_0_matched_pattern_1: DiagnosticMessage;
+        Trying_substitution_0_candidate_module_location_Colon_1: DiagnosticMessage;
+        Resolving_module_name_0_relative_to_base_url_1_2: DiagnosticMessage;
+        Loading_module_as_file_Slash_folder_candidate_module_location_0_target_file_type_1: DiagnosticMessage;
+        File_0_does_not_exist: DiagnosticMessage;
+        File_0_exist_use_it_as_a_name_resolution_result: DiagnosticMessage;
+        Loading_module_0_from_node_modules_folder_target_file_type_1: DiagnosticMessage;
+        Found_package_json_at_0: DiagnosticMessage;
+        package_json_does_not_have_a_0_field: DiagnosticMessage;
+        package_json_has_0_field_1_that_references_2: DiagnosticMessage;
+        Allow_javascript_files_to_be_compiled: DiagnosticMessage;
+        Option_0_should_have_array_of_strings_as_a_value: DiagnosticMessage;
+        Checking_if_0_is_the_longest_matching_prefix_for_1_2: DiagnosticMessage;
+        Expected_type_of_0_field_in_package_json_to_be_string_got_1: DiagnosticMessage;
+        baseUrl_option_is_set_to_0_using_this_value_to_resolve_non_relative_module_name_1: DiagnosticMessage;
+        rootDirs_option_is_set_using_it_to_resolve_relative_module_name_0: DiagnosticMessage;
+        Longest_matching_prefix_for_0_is_1: DiagnosticMessage;
+        Loading_0_from_the_root_dir_1_candidate_location_2: DiagnosticMessage;
+        Trying_other_entries_in_rootDirs: DiagnosticMessage;
+        Module_resolution_using_rootDirs_has_failed: DiagnosticMessage;
+        Do_not_emit_use_strict_directives_in_module_output: DiagnosticMessage;
+        Enable_strict_null_checks: DiagnosticMessage;
+        Unknown_option_excludes_Did_you_mean_exclude: DiagnosticMessage;
+        Raise_error_on_this_expressions_with_an_implied_any_type: DiagnosticMessage;
+        Resolving_type_reference_directive_0_containing_file_1_root_directory_2: DiagnosticMessage;
+        Resolving_using_primary_search_paths: DiagnosticMessage;
+        Resolving_from_node_modules_folder: DiagnosticMessage;
+        Type_reference_directive_0_was_successfully_resolved_to_1_primary_Colon_2: DiagnosticMessage;
+        Type_reference_directive_0_was_not_resolved: DiagnosticMessage;
+        Resolving_with_primary_search_path_0: DiagnosticMessage;
+        Root_directory_cannot_be_determined_skipping_primary_search_paths: DiagnosticMessage;
+        Resolving_type_reference_directive_0_containing_file_1_root_directory_not_set: DiagnosticMessage;
+        Type_declaration_files_to_be_included_in_compilation: DiagnosticMessage;
+        Looking_up_in_node_modules_folder_initial_location_0: DiagnosticMessage;
+        Containing_file_is_not_specified_and_root_directory_cannot_be_determined_skipping_lookup_in_node_modules_folder: DiagnosticMessage;
+        Resolving_type_reference_directive_0_containing_file_not_set_root_directory_1: DiagnosticMessage;
+        Resolving_type_reference_directive_0_containing_file_not_set_root_directory_not_set: DiagnosticMessage;
+        Resolving_real_path_for_0_result_1: DiagnosticMessage;
+        Cannot_compile_modules_using_option_0_unless_the_module_flag_is_amd_or_system: DiagnosticMessage;
+        File_name_0_has_a_1_extension_stripping_it: DiagnosticMessage;
+        _0_is_declared_but_its_value_is_never_read: DiagnosticMessage;
+        Report_errors_on_unused_locals: DiagnosticMessage;
+        Report_errors_on_unused_parameters: DiagnosticMessage;
+        The_maximum_dependency_depth_to_search_under_node_modules_and_load_JavaScript_files: DiagnosticMessage;
+        Cannot_import_type_declaration_files_Consider_importing_0_instead_of_1: DiagnosticMessage;
+        Property_0_is_declared_but_its_value_is_never_read: DiagnosticMessage;
+        Import_emit_helpers_from_tslib: DiagnosticMessage;
+        Auto_discovery_for_typings_is_enabled_in_project_0_Running_extra_resolution_pass_for_module_1_using_cache_location_2: DiagnosticMessage;
+        Parse_in_strict_mode_and_emit_use_strict_for_each_source_file: DiagnosticMessage;
+        Module_0_was_resolved_to_1_but_jsx_is_not_set: DiagnosticMessage;
+        Module_0_was_resolved_as_locally_declared_ambient_module_in_file_1: DiagnosticMessage;
+        Module_0_was_resolved_as_ambient_module_declared_in_1_since_this_file_was_not_modified: DiagnosticMessage;
+        Specify_the_JSX_factory_function_to_use_when_targeting_react_JSX_emit_e_g_React_createElement_or_h: DiagnosticMessage;
+        Resolution_for_module_0_was_found_in_cache_from_location_1: DiagnosticMessage;
+        Directory_0_does_not_exist_skipping_all_lookups_in_it: DiagnosticMessage;
+        Show_diagnostic_information: DiagnosticMessage;
+        Show_verbose_diagnostic_information: DiagnosticMessage;
+        Emit_a_single_file_with_source_maps_instead_of_having_a_separate_file: DiagnosticMessage;
+        Emit_the_source_alongside_the_sourcemaps_within_a_single_file_requires_inlineSourceMap_or_sourceMap_to_be_set: DiagnosticMessage;
+        Transpile_each_file_as_a_separate_module_similar_to_ts_transpileModule: DiagnosticMessage;
+        Print_names_of_generated_files_part_of_the_compilation: DiagnosticMessage;
+        Print_names_of_files_part_of_the_compilation: DiagnosticMessage;
+        The_locale_used_when_displaying_messages_to_the_user_e_g_en_us: DiagnosticMessage;
+        Do_not_generate_custom_helper_functions_like_extends_in_compiled_output: DiagnosticMessage;
+        Do_not_include_the_default_library_file_lib_d_ts: DiagnosticMessage;
+        Do_not_add_triple_slash_references_or_imported_modules_to_the_list_of_compiled_files: DiagnosticMessage;
+        Deprecated_Use_skipLibCheck_instead_Skip_type_checking_of_default_library_declaration_files: DiagnosticMessage;
+        List_of_folders_to_include_type_definitions_from: DiagnosticMessage;
+        Disable_size_limitations_on_JavaScript_projects: DiagnosticMessage;
+        The_character_set_of_the_input_files: DiagnosticMessage;
+        Emit_a_UTF_8_Byte_Order_Mark_BOM_in_the_beginning_of_output_files: DiagnosticMessage;
+        Do_not_truncate_error_messages: DiagnosticMessage;
+        Output_directory_for_generated_declaration_files: DiagnosticMessage;
+        A_series_of_entries_which_re_map_imports_to_lookup_locations_relative_to_the_baseUrl: DiagnosticMessage;
+        List_of_root_folders_whose_combined_content_represents_the_structure_of_the_project_at_runtime: DiagnosticMessage;
+        Show_all_compiler_options: DiagnosticMessage;
+        Deprecated_Use_outFile_instead_Concatenate_and_emit_output_to_single_file: DiagnosticMessage;
+        Command_line_Options: DiagnosticMessage;
+        Basic_Options: DiagnosticMessage;
+        Strict_Type_Checking_Options: DiagnosticMessage;
+        Module_Resolution_Options: DiagnosticMessage;
+        Source_Map_Options: DiagnosticMessage;
+        Additional_Checks: DiagnosticMessage;
+        Experimental_Options: DiagnosticMessage;
+        Advanced_Options: DiagnosticMessage;
+        Provide_full_support_for_iterables_in_for_of_spread_and_destructuring_when_targeting_ES5_or_ES3: DiagnosticMessage;
+        Enable_all_strict_type_checking_options: DiagnosticMessage;
+        List_of_language_service_plugins: DiagnosticMessage;
+        Scoped_package_detected_looking_in_0: DiagnosticMessage;
+        Reusing_resolution_of_module_0_to_file_1_from_old_program: DiagnosticMessage;
+        Reusing_module_resolutions_originating_in_0_since_resolutions_are_unchanged_from_old_program: DiagnosticMessage;
+        Disable_strict_checking_of_generic_signatures_in_function_types: DiagnosticMessage;
+        Enable_strict_checking_of_function_types: DiagnosticMessage;
+        Enable_strict_checking_of_property_initialization_in_classes: DiagnosticMessage;
+        Numeric_separators_are_not_allowed_here: DiagnosticMessage;
+        Multiple_consecutive_numeric_separators_are_not_permitted: DiagnosticMessage;
+        Found_package_json_at_0_Package_ID_is_1: DiagnosticMessage;
+        Whether_to_keep_outdated_console_output_in_watch_mode_instead_of_clearing_the_screen: DiagnosticMessage;
+        All_imports_in_import_declaration_are_unused: DiagnosticMessage;
+        Found_1_error_Watching_for_file_changes: DiagnosticMessage;
+        Found_0_errors_Watching_for_file_changes: DiagnosticMessage;
+        Resolve_keyof_to_string_valued_property_names_only_no_numbers_or_symbols: DiagnosticMessage;
+        _0_is_declared_but_never_used: DiagnosticMessage;
+        Include_modules_imported_with_json_extension: DiagnosticMessage;
+        All_destructured_elements_are_unused: DiagnosticMessage;
+        All_variables_are_unused: DiagnosticMessage;
+        Projects_to_reference: DiagnosticMessage;
+        Enable_project_compilation: DiagnosticMessage;
+        Project_references_may_not_form_a_circular_graph_Cycle_detected_Colon_0: DiagnosticMessage;
+        Composite_projects_may_not_disable_declaration_emit: DiagnosticMessage;
+        Output_file_0_has_not_been_built_from_source_file_1: DiagnosticMessage;
+        Referenced_project_0_must_have_setting_composite_Colon_true: DiagnosticMessage;
+        File_0_is_not_in_project_file_list_Projects_must_list_all_files_or_use_an_include_pattern: DiagnosticMessage;
+        Cannot_prepend_project_0_because_it_does_not_have_outFile_set: DiagnosticMessage;
+        Output_file_0_from_project_1_does_not_exist: DiagnosticMessage;
+        Project_0_is_out_of_date_because_oldest_output_1_is_older_than_newest_input_2: DiagnosticMessage;
+        Project_0_is_up_to_date_because_newest_input_1_is_older_than_oldest_output_2: DiagnosticMessage;
+        Project_0_is_out_of_date_because_output_file_1_does_not_exist: DiagnosticMessage;
+        Project_0_is_out_of_date_because_its_dependency_1_is_out_of_date: DiagnosticMessage;
+        Project_0_is_up_to_date_with_d_ts_files_from_its_dependencies: DiagnosticMessage;
+        Projects_in_this_build_Colon_0: DiagnosticMessage;
+        A_non_dry_build_would_delete_the_following_files_Colon_0: DiagnosticMessage;
+        A_non_dry_build_would_build_project_0: DiagnosticMessage;
+        Building_project_0: DiagnosticMessage;
+        Updating_output_timestamps_of_project_0: DiagnosticMessage;
+        delete_this_Project_0_is_up_to_date_because_it_was_previously_built: DiagnosticMessage;
+        Project_0_is_up_to_date: DiagnosticMessage;
+        Skipping_build_of_project_0_because_its_dependency_1_has_errors: DiagnosticMessage;
+        Project_0_can_t_be_built_because_its_dependency_1_has_errors: DiagnosticMessage;
+        Build_one_or_more_projects_and_their_dependencies_if_out_of_date: DiagnosticMessage;
+        Delete_the_outputs_of_all_projects: DiagnosticMessage;
+        Enable_verbose_logging: DiagnosticMessage;
+        Show_what_would_be_built_or_deleted_if_specified_with_clean: DiagnosticMessage;
+        Build_all_projects_including_those_that_appear_to_be_up_to_date: DiagnosticMessage;
+        Option_build_must_be_the_first_command_line_argument: DiagnosticMessage;
+        Options_0_and_1_cannot_be_combined: DiagnosticMessage;
+        Skipping_clean_because_not_all_projects_could_be_located: DiagnosticMessage;
+        Variable_0_implicitly_has_an_1_type: DiagnosticMessage;
+        Parameter_0_implicitly_has_an_1_type: DiagnosticMessage;
+        Member_0_implicitly_has_an_1_type: DiagnosticMessage;
+        new_expression_whose_target_lacks_a_construct_signature_implicitly_has_an_any_type: DiagnosticMessage;
+        _0_which_lacks_return_type_annotation_implicitly_has_an_1_return_type: DiagnosticMessage;
+        Function_expression_which_lacks_return_type_annotation_implicitly_has_an_0_return_type: DiagnosticMessage;
+        Construct_signature_which_lacks_return_type_annotation_implicitly_has_an_any_return_type: DiagnosticMessage;
+        Element_implicitly_has_an_any_type_because_index_expression_is_not_of_type_number: DiagnosticMessage;
+        Could_not_find_a_declaration_file_for_module_0_1_implicitly_has_an_any_type: DiagnosticMessage;
+        Element_implicitly_has_an_any_type_because_type_0_has_no_index_signature: DiagnosticMessage;
+        Object_literal_s_property_0_implicitly_has_an_1_type: DiagnosticMessage;
+        Rest_parameter_0_implicitly_has_an_any_type: DiagnosticMessage;
+        Call_signature_which_lacks_return_type_annotation_implicitly_has_an_any_return_type: DiagnosticMessage;
+        _0_implicitly_has_type_any_because_it_does_not_have_a_type_annotation_and_is_referenced_directly_or_indirectly_in_its_own_initializer: DiagnosticMessage;
+        _0_implicitly_has_return_type_any_because_it_does_not_have_a_return_type_annotation_and_is_referenced_directly_or_indirectly_in_one_of_its_return_expressions: DiagnosticMessage;
+        Function_implicitly_has_return_type_any_because_it_does_not_have_a_return_type_annotation_and_is_referenced_directly_or_indirectly_in_one_of_its_return_expressions: DiagnosticMessage;
+        Generator_implicitly_has_type_0_because_it_does_not_yield_any_values_Consider_supplying_a_return_type: DiagnosticMessage;
+        JSX_element_implicitly_has_type_any_because_no_interface_JSX_0_exists: DiagnosticMessage;
+        Unreachable_code_detected: DiagnosticMessage;
+        Unused_label: DiagnosticMessage;
+        Fallthrough_case_in_switch: DiagnosticMessage;
+        Not_all_code_paths_return_a_value: DiagnosticMessage;
+        Binding_element_0_implicitly_has_an_1_type: DiagnosticMessage;
+        Property_0_implicitly_has_type_any_because_its_set_accessor_lacks_a_parameter_type_annotation: DiagnosticMessage;
+        Property_0_implicitly_has_type_any_because_its_get_accessor_lacks_a_return_type_annotation: DiagnosticMessage;
+        Variable_0_implicitly_has_type_1_in_some_locations_where_its_type_cannot_be_determined: DiagnosticMessage;
+        Try_npm_install_types_Slash_0_if_it_exists_or_add_a_new_declaration_d_ts_file_containing_declare_module_0: DiagnosticMessage;
+        Dynamic_import_s_specifier_must_be_of_type_string_but_here_has_type_0: DiagnosticMessage;
+        Enables_emit_interoperability_between_CommonJS_and_ES_Modules_via_creation_of_namespace_objects_for_all_imports_Implies_allowSyntheticDefaultImports: DiagnosticMessage;
+        A_namespace_style_import_cannot_be_called_or_constructed_and_will_cause_a_failure_at_runtime: DiagnosticMessage;
+        Mapped_object_type_implicitly_has_an_any_template_type: DiagnosticMessage;
+        You_cannot_rename_this_element: DiagnosticMessage;
+        You_cannot_rename_elements_that_are_defined_in_the_standard_TypeScript_library: DiagnosticMessage;
+        import_can_only_be_used_in_a_ts_file: DiagnosticMessage;
+        export_can_only_be_used_in_a_ts_file: DiagnosticMessage;
+        type_parameter_declarations_can_only_be_used_in_a_ts_file: DiagnosticMessage;
+        implements_clauses_can_only_be_used_in_a_ts_file: DiagnosticMessage;
+        interface_declarations_can_only_be_used_in_a_ts_file: DiagnosticMessage;
+        module_declarations_can_only_be_used_in_a_ts_file: DiagnosticMessage;
+        type_aliases_can_only_be_used_in_a_ts_file: DiagnosticMessage;
+        _0_can_only_be_used_in_a_ts_file: DiagnosticMessage;
+        types_can_only_be_used_in_a_ts_file: DiagnosticMessage;
+        type_arguments_can_only_be_used_in_a_ts_file: DiagnosticMessage;
+        parameter_modifiers_can_only_be_used_in_a_ts_file: DiagnosticMessage;
+        non_null_assertions_can_only_be_used_in_a_ts_file: DiagnosticMessage;
+        enum_declarations_can_only_be_used_in_a_ts_file: DiagnosticMessage;
+        type_assertion_expressions_can_only_be_used_in_a_ts_file: DiagnosticMessage;
+        Octal_literal_types_must_use_ES2015_syntax_Use_the_syntax_0: DiagnosticMessage;
+        Octal_literals_are_not_allowed_in_enums_members_initializer_Use_the_syntax_0: DiagnosticMessage;
+        Report_errors_in_js_files: DiagnosticMessage;
+        JSDoc_types_can_only_be_used_inside_documentation_comments: DiagnosticMessage;
+        JSDoc_typedef_tag_should_either_have_a_type_annotation_or_be_followed_by_property_or_member_tags: DiagnosticMessage;
+        JSDoc_0_is_not_attached_to_a_class: DiagnosticMessage;
+        JSDoc_0_1_does_not_match_the_extends_2_clause: DiagnosticMessage;
+        JSDoc_param_tag_has_name_0_but_there_is_no_parameter_with_that_name: DiagnosticMessage;
+        Class_declarations_cannot_have_more_than_one_augments_or_extends_tag: DiagnosticMessage;
+        Expected_0_type_arguments_provide_these_with_an_extends_tag: DiagnosticMessage;
+        Expected_0_1_type_arguments_provide_these_with_an_extends_tag: DiagnosticMessage;
+        JSDoc_may_only_appear_in_the_last_parameter_of_a_signature: DiagnosticMessage;
+        JSDoc_param_tag_has_name_0_but_there_is_no_parameter_with_that_name_It_would_match_arguments_if_it_had_an_array_type: DiagnosticMessage;
+        Only_identifiers_Slashqualified_names_with_optional_type_arguments_are_currently_supported_in_a_class_extends_clause: DiagnosticMessage;
+        class_expressions_are_not_currently_supported: DiagnosticMessage;
+        Language_service_is_disabled: DiagnosticMessage;
+        JSX_attributes_must_only_be_assigned_a_non_empty_expression: DiagnosticMessage;
+        JSX_elements_cannot_have_multiple_attributes_with_the_same_name: DiagnosticMessage;
+        Expected_corresponding_JSX_closing_tag_for_0: DiagnosticMessage;
+        JSX_attribute_expected: DiagnosticMessage;
+        Cannot_use_JSX_unless_the_jsx_flag_is_provided: DiagnosticMessage;
+        A_constructor_cannot_contain_a_super_call_when_its_class_extends_null: DiagnosticMessage;
+        An_unary_expression_with_the_0_operator_is_not_allowed_in_the_left_hand_side_of_an_exponentiation_expression_Consider_enclosing_the_expression_in_parentheses: DiagnosticMessage;
+        A_type_assertion_expression_is_not_allowed_in_the_left_hand_side_of_an_exponentiation_expression_Consider_enclosing_the_expression_in_parentheses: DiagnosticMessage;
+        JSX_element_0_has_no_corresponding_closing_tag: DiagnosticMessage;
+        super_must_be_called_before_accessing_this_in_the_constructor_of_a_derived_class: DiagnosticMessage;
+        Unknown_type_acquisition_option_0: DiagnosticMessage;
+        super_must_be_called_before_accessing_a_property_of_super_in_the_constructor_of_a_derived_class: DiagnosticMessage;
+        _0_is_not_a_valid_meta_property_for_keyword_1_Did_you_mean_2: DiagnosticMessage;
+        Meta_property_0_is_only_allowed_in_the_body_of_a_function_declaration_function_expression_or_constructor: DiagnosticMessage;
+        JSX_fragment_has_no_corresponding_closing_tag: DiagnosticMessage;
+        Expected_corresponding_closing_tag_for_JSX_fragment: DiagnosticMessage;
+        JSX_fragment_is_not_supported_when_using_jsxFactory: DiagnosticMessage;
+        JSX_fragment_is_not_supported_when_using_an_inline_JSX_factory_pragma: DiagnosticMessage;
+        Circularity_detected_while_resolving_configuration_Colon_0: DiagnosticMessage;
+        A_path_in_an_extends_option_must_be_relative_or_rooted_but_0_is_not: DiagnosticMessage;
+        The_files_list_in_config_file_0_is_empty: DiagnosticMessage;
+        No_inputs_were_found_in_config_file_0_Specified_include_paths_were_1_and_exclude_paths_were_2: DiagnosticMessage;
+        File_is_a_CommonJS_module_it_may_be_converted_to_an_ES6_module: DiagnosticMessage;
+        This_constructor_function_may_be_converted_to_a_class_declaration: DiagnosticMessage;
+        Import_may_be_converted_to_a_default_import: DiagnosticMessage;
+        JSDoc_types_may_be_moved_to_TypeScript_types: DiagnosticMessage;
+        require_call_may_be_converted_to_an_import: DiagnosticMessage;
+        Add_missing_super_call: DiagnosticMessage;
+        Make_super_call_the_first_statement_in_the_constructor: DiagnosticMessage;
+        Change_extends_to_implements: DiagnosticMessage;
+        Remove_declaration_for_Colon_0: DiagnosticMessage;
+        Remove_import_from_0: DiagnosticMessage;
+        Implement_interface_0: DiagnosticMessage;
+        Implement_inherited_abstract_class: DiagnosticMessage;
+        Add_0_to_unresolved_variable: DiagnosticMessage;
+        Remove_destructuring: DiagnosticMessage;
+        Remove_variable_statement: DiagnosticMessage;
+        Import_0_from_module_1: DiagnosticMessage;
+        Change_0_to_1: DiagnosticMessage;
+        Add_0_to_existing_import_declaration_from_1: DiagnosticMessage;
+        Declare_property_0: DiagnosticMessage;
+        Add_index_signature_for_property_0: DiagnosticMessage;
+        Disable_checking_for_this_file: DiagnosticMessage;
+        Ignore_this_error_message: DiagnosticMessage;
+        Initialize_property_0_in_the_constructor: DiagnosticMessage;
+        Initialize_static_property_0: DiagnosticMessage;
+        Change_spelling_to_0: DiagnosticMessage;
+        Declare_method_0: DiagnosticMessage;
+        Declare_static_method_0: DiagnosticMessage;
+        Prefix_0_with_an_underscore: DiagnosticMessage;
+        Rewrite_as_the_indexed_access_type_0: DiagnosticMessage;
+        Declare_static_property_0: DiagnosticMessage;
+        Call_decorator_expression: DiagnosticMessage;
+        Add_async_modifier_to_containing_function: DiagnosticMessage;
+        Convert_function_to_an_ES2015_class: DiagnosticMessage;
+        Convert_function_0_to_class: DiagnosticMessage;
+        Extract_to_0_in_1: DiagnosticMessage;
+        Extract_function: DiagnosticMessage;
+        Extract_constant: DiagnosticMessage;
+        Extract_to_0_in_enclosing_scope: DiagnosticMessage;
+        Extract_to_0_in_1_scope: DiagnosticMessage;
+        Annotate_with_type_from_JSDoc: DiagnosticMessage;
+        Annotate_with_types_from_JSDoc: DiagnosticMessage;
+        Infer_type_of_0_from_usage: DiagnosticMessage;
+        Infer_parameter_types_from_usage: DiagnosticMessage;
+        Convert_to_default_import: DiagnosticMessage;
+        Install_0: DiagnosticMessage;
+        Replace_import_with_0: DiagnosticMessage;
+        Use_synthetic_default_member: DiagnosticMessage;
+        Convert_to_ES6_module: DiagnosticMessage;
+        Add_undefined_type_to_property_0: DiagnosticMessage;
+        Add_initializer_to_property_0: DiagnosticMessage;
+        Add_definite_assignment_assertion_to_property_0: DiagnosticMessage;
+        Add_all_missing_members: DiagnosticMessage;
+        Infer_all_types_from_usage: DiagnosticMessage;
+        Delete_all_unused_declarations: DiagnosticMessage;
+        Prefix_all_unused_declarations_with_where_possible: DiagnosticMessage;
+        Fix_all_detected_spelling_errors: DiagnosticMessage;
+        Add_initializers_to_all_uninitialized_properties: DiagnosticMessage;
+        Add_definite_assignment_assertions_to_all_uninitialized_properties: DiagnosticMessage;
+        Add_undefined_type_to_all_uninitialized_properties: DiagnosticMessage;
+        Change_all_jsdoc_style_types_to_TypeScript: DiagnosticMessage;
+        Change_all_jsdoc_style_types_to_TypeScript_and_add_undefined_to_nullable_types: DiagnosticMessage;
+        Implement_all_unimplemented_interfaces: DiagnosticMessage;
+        Install_all_missing_types_packages: DiagnosticMessage;
+        Rewrite_all_as_indexed_access_types: DiagnosticMessage;
+        Convert_all_to_default_imports: DiagnosticMessage;
+        Make_all_super_calls_the_first_statement_in_their_constructor: DiagnosticMessage;
+        Add_qualifier_to_all_unresolved_variables_matching_a_member_name: DiagnosticMessage;
+        Change_all_extended_interfaces_to_implements: DiagnosticMessage;
+        Add_all_missing_super_calls: DiagnosticMessage;
+        Implement_all_inherited_abstract_classes: DiagnosticMessage;
+        Add_all_missing_async_modifiers: DiagnosticMessage;
+        Add_ts_ignore_to_all_error_messages: DiagnosticMessage;
+        Annotate_everything_with_types_from_JSDoc: DiagnosticMessage;
+        Add_to_all_uncalled_decorators: DiagnosticMessage;
+        Convert_all_constructor_functions_to_classes: DiagnosticMessage;
+        Generate_get_and_set_accessors: DiagnosticMessage;
+        Convert_require_to_import: DiagnosticMessage;
+        Convert_all_require_to_import: DiagnosticMessage;
+        Move_to_a_new_file: DiagnosticMessage;
+        Remove_unreachable_code: DiagnosticMessage;
+        Remove_all_unreachable_code: DiagnosticMessage;
+        Add_missing_typeof: DiagnosticMessage;
+        Remove_unused_label: DiagnosticMessage;
+        Remove_all_unused_labels: DiagnosticMessage;
+        Convert_0_to_mapped_object_type: DiagnosticMessage;
+        Convert_namespace_import_to_named_imports: DiagnosticMessage;
+        Convert_named_imports_to_namespace_import: DiagnosticMessage;
+    };
+}
+declare namespace ts {
+    type ErrorCallback = (message: DiagnosticMessage, length: number) => void;
+    function tokenIsIdentifierOrKeyword(token: SyntaxKind): boolean;
+    function tokenIsIdentifierOrKeywordOrGreaterThan(token: SyntaxKind): boolean;
+    interface Scanner {
+        getStartPos(): number;
+        getToken(): SyntaxKind;
+        getTextPos(): number;
+        getTokenPos(): number;
+        getTokenText(): string;
+        getTokenValue(): string;
+        hasExtendedUnicodeEscape(): boolean;
+        hasPrecedingLineBreak(): boolean;
+        isIdentifier(): boolean;
+        isReservedWord(): boolean;
+        isUnterminated(): boolean;
+        getTokenFlags(): TokenFlags;
+        reScanGreaterToken(): SyntaxKind;
+        reScanSlashToken(): SyntaxKind;
+        reScanTemplateToken(): SyntaxKind;
+        scanJsxIdentifier(): SyntaxKind;
+        scanJsxAttributeValue(): SyntaxKind;
+        reScanJsxToken(): JsxTokenSyntaxKind;
+        scanJsxToken(): JsxTokenSyntaxKind;
+        scanJSDocToken(): JsDocSyntaxKind;
+        scan(): SyntaxKind;
+        getText(): string;
+        setText(text: string | undefined, start?: number, length?: number): void;
+        setOnError(onError: ErrorCallback | undefined): void;
+        setScriptTarget(scriptTarget: ScriptTarget): void;
+        setLanguageVariant(variant: LanguageVariant): void;
+        setTextPos(textPos: number): void;
+        lookAhead<T>(callback: () => T): T;
+        scanRange<T>(start: number, length: number, callback: () => T): T;
+        tryScan<T>(callback: () => T): T;
+    }
+    function isUnicodeIdentifierStart(code: number, languageVersion: ScriptTarget | undefined): boolean;
+    function tokenToString(t: SyntaxKind): string | undefined;
+    function stringToToken(s: string): SyntaxKind | undefined;
+    function computeLineStarts(text: string): number[];
+    function getPositionOfLineAndCharacter(sourceFile: SourceFileLike, line: number, character: number): number;
+    function computePositionOfLineAndCharacter(lineStarts: ReadonlyArray<number>, line: number, character: number, debugText?: string): number;
+    function getLineStarts(sourceFile: SourceFileLike): ReadonlyArray<number>;
+    /**
+     * We assume the first line starts at position 0 and 'position' is non-negative.
+     */
+    function computeLineAndCharacterOfPosition(lineStarts: ReadonlyArray<number>, position: number): LineAndCharacter;
+    function getLineAndCharacterOfPosition(sourceFile: SourceFileLike, position: number): LineAndCharacter;
+    function isWhiteSpaceLike(ch: number): boolean;
+    /** Does not include line breaks. For that, see isWhiteSpaceLike. */
+    function isWhiteSpaceSingleLine(ch: number): boolean;
+    function isLineBreak(ch: number): boolean;
+    function isOctalDigit(ch: number): boolean;
+    function couldStartTrivia(text: string, pos: number): boolean;
+    function skipTrivia(text: string, pos: number, stopAfterLineBreak?: boolean, stopAtComments?: boolean): number;
+    function forEachLeadingCommentRange<U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean) => U): U | undefined;
+    function forEachLeadingCommentRange<T, U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean, state: T) => U, state: T): U | undefined;
+    function forEachTrailingCommentRange<U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean) => U): U | undefined;
+    function forEachTrailingCommentRange<T, U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean, state: T) => U, state: T): U | undefined;
+    function reduceEachLeadingCommentRange<T, U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean, state: T, memo: U) => U, state: T, initial: U): U | undefined;
+    function reduceEachTrailingCommentRange<T, U>(text: string, pos: number, cb: (pos: number, end: number, kind: CommentKind, hasTrailingNewLine: boolean, state: T, memo: U) => U, state: T, initial: U): U | undefined;
+    function getLeadingCommentRanges(text: string, pos: number): CommentRange[] | undefined;
+    function getTrailingCommentRanges(text: string, pos: number): CommentRange[] | undefined;
+    /** Optionally, get the shebang */
+    function getShebang(text: string): string | undefined;
+    function isIdentifierStart(ch: number, languageVersion: ScriptTarget | undefined): boolean;
+    function isIdentifierPart(ch: number, languageVersion: ScriptTarget | undefined): boolean;
+    function isIdentifierText(name: string, languageVersion: ScriptTarget | undefined): boolean;
+    function createScanner(languageVersion: ScriptTarget, skipTrivia: boolean, languageVariant?: LanguageVariant, textInitial?: string, onError?: ErrorCallback, start?: number, length?: number): Scanner;
+}
+/** Non-internal stuff goes here */
+declare namespace ts {
+    const emptyArray: never[];
+    function closeFileWatcher(watcher: FileWatcher): void;
+    function isExternalModuleNameRelative(moduleName: string): boolean;
+    function sortAndDeduplicateDiagnostics<T extends Diagnostic>(diagnostics: ReadonlyArray<T>): T[];
+    function toPath(fileName: string, basePath: string | undefined, getCanonicalFileName: (path: string) => string): Path;
+    function hasEntries(map: ReadonlyUnderscoreEscapedMap<any> | undefined): map is ReadonlyUnderscoreEscapedMap<any>;
+}
+declare namespace ts {
+    const resolvingEmptyArray: never[];
+    const emptyMap: ReadonlyMap<never>;
+    const emptyUnderscoreEscapedMap: ReadonlyUnderscoreEscapedMap<never>;
+    const externalHelpersModuleNameText = "tslib";
+    function getDeclarationOfKind<T extends Declaration>(symbol: Symbol, kind: T["kind"]): T | undefined;
+    /** Create a new escaped identifier map. */
+    function createUnderscoreEscapedMap<T>(): UnderscoreEscapedMap<T>;
+    function createSymbolTable(symbols?: ReadonlyArray<Symbol>): SymbolTable;
+    function changesAffectModuleResolution(oldOptions: CompilerOptions, newOptions: CompilerOptions): boolean;
+    /**
+     * Iterates through the parent chain of a node and performs the callback on each parent until the callback
+     * returns a truthy value, then returns that value.
+     * If no such value is found, it applies the callback until the parent pointer is undefined or the callback returns "quit"
+     * At that point findAncestor returns undefined.
+     */
+    function findAncestor<T extends Node>(node: Node | undefined, callback: (element: Node) => element is T): T | undefined;
+    function findAncestor(node: Node | undefined, callback: (element: Node) => boolean | "quit"): Node | undefined;
+    /**
+     * Calls `callback` for each entry in the map, returning the first truthy result.
+     * Use `map.forEach` instead for normal iteration.
+     */
+    function forEachEntry<T, U>(map: ReadonlyUnderscoreEscapedMap<T>, callback: (value: T, key: __String) => U | undefined): U | undefined;
+    function forEachEntry<T, U>(map: ReadonlyMap<T>, callback: (value: T, key: string) => U | undefined): U | undefined;
+    /** `forEachEntry` for just keys. */
+    function forEachKey<T>(map: ReadonlyUnderscoreEscapedMap<{}>, callback: (key: __String) => T | undefined): T | undefined;
+    function forEachKey<T>(map: ReadonlyMap<{}>, callback: (key: string) => T | undefined): T | undefined;
+    /** Copy entries from `source` to `target`. */
+    function copyEntries<T>(source: ReadonlyUnderscoreEscapedMap<T>, target: UnderscoreEscapedMap<T>): void;
+    function copyEntries<T>(source: ReadonlyMap<T>, target: Map<T>): void;
+    /**
+     * Creates a set from the elements of an array.
+     *
+     * @param array the array of input elements.
+     */
+    function arrayToSet(array: ReadonlyArray<string>): Map<true>;
+    function arrayToSet<T>(array: ReadonlyArray<T>, makeKey: (value: T) => string | undefined): Map<true>;
+    function arrayToSet<T>(array: ReadonlyArray<T>, makeKey: (value: T) => __String | undefined): UnderscoreEscapedMap<true>;
+    function cloneMap(map: SymbolTable): SymbolTable;
+    function cloneMap<T>(map: ReadonlyMap<T>): Map<T>;
+    function cloneMap<T>(map: ReadonlyUnderscoreEscapedMap<T>): UnderscoreEscapedMap<T>;
+    function usingSingleLineStringWriter(action: (writer: EmitTextWriter) => void): string;
+    function getFullWidth(node: Node): number;
+    function getResolvedModule(sourceFile: SourceFile, moduleNameText: string): ResolvedModuleFull | undefined;
+    function setResolvedModule(sourceFile: SourceFile, moduleNameText: string, resolvedModule: ResolvedModuleFull): void;
+    function setResolvedTypeReferenceDirective(sourceFile: SourceFile, typeReferenceDirectiveName: string, resolvedTypeReferenceDirective: ResolvedTypeReferenceDirective): void;
+    function moduleResolutionIsEqualTo(oldResolution: ResolvedModuleFull, newResolution: ResolvedModuleFull): boolean;
+    function packageIdToString({ name, subModuleName, version }: PackageId): string;
+    function typeDirectiveIsEqualTo(oldResolution: ResolvedTypeReferenceDirective, newResolution: ResolvedTypeReferenceDirective): boolean;
+    function hasChangesInResolutions<T>(names: ReadonlyArray<string>, newResolutions: ReadonlyArray<T>, oldResolutions: ReadonlyMap<T> | undefined, comparer: (oldResolution: T, newResolution: T) => boolean): boolean;
+    function containsParseError(node: Node): boolean;
+    function getSourceFileOfNode(node: Node): SourceFile;
+    function getSourceFileOfNode(node: Node | undefined): SourceFile | undefined;
+    function isStatementWithLocals(node: Node): boolean;
+    function getStartPositionOfLine(line: number, sourceFile: SourceFileLike): number;
+    function nodePosToString(node: Node): string;
+    function getEndLinePosition(line: number, sourceFile: SourceFileLike): number;
+    /**
+     * Returns a value indicating whether a name is unique globally or within the current file.
+     * Note: This does not consider whether a name appears as a free identifier or not, so at the expression `x.y` this includes both `x` and `y`.
+     */
+    function isFileLevelUniqueName(sourceFile: SourceFile, name: string, hasGlobalName?: PrintHandlers["hasGlobalName"]): boolean;
+    function nodeIsMissing(node: Node | undefined): boolean;
+    function nodeIsPresent(node: Node | undefined): boolean;
+    /**
+     * Appends a range of value to begin of an array, returning the array.
+     *
+     * @param to The array to which `value` is to be appended. If `to` is `undefined`, a new array
+     * is created if `value` was appended.
+     * @param from The values to append to the array. If `from` is `undefined`, nothing is
+     * appended. If an element of `from` is `undefined`, that element is not appended.
+     */
+    function prependStatements<T extends Statement>(to: T[], from: ReadonlyArray<T> | undefined): T[] | undefined;
+    /**
+     * Determine if the given comment is a triple-slash
+     *
+     * @return true if the comment is a triple-slash comment else false
+     */
+    function isRecognizedTripleSlashComment(text: string, commentPos: number, commentEnd: number): boolean;
+    function isPinnedComment(text: string, start: number): boolean;
+    function getTokenPosOfNode(node: Node, sourceFile?: SourceFileLike, includeJsDoc?: boolean): number;
+    function getNonDecoratorTokenPosOfNode(node: Node, sourceFile?: SourceFileLike): number;
+    function getSourceTextOfNodeFromSourceFile(sourceFile: SourceFile, node: Node, includeTrivia?: boolean): string;
+    function getTextOfNodeFromSourceText(sourceText: string, node: Node, includeTrivia?: boolean): string;
+    function getTextOfNode(node: Node, includeTrivia?: boolean): string;
+    /**
+     * Note: it is expected that the `nodeArray` and the `node` are within the same file.
+     * For example, searching for a `SourceFile` in a `SourceFile[]` wouldn't work.
+     */
+    function indexOfNode(nodeArray: ReadonlyArray<Node>, node: Node): number;
+    /**
+     * Gets flags that control emit behavior of a node.
+     */
+    function getEmitFlags(node: Node): EmitFlags;
+    function getLiteralText(node: LiteralLikeNode, sourceFile: SourceFile): string;
+    function getTextOfConstantValue(value: string | number): string;
+    function escapeLeadingUnderscores(identifier: string): __String;
+    /**
+     * @deprecated Use `id.escapedText` to get the escaped text of an Identifier.
+     * @param identifier The identifier to escape
+     */
+    function escapeIdentifier(identifier: string): string;
+    function makeIdentifierFromModuleName(moduleName: string): string;
+    function isBlockOrCatchScoped(declaration: Declaration): boolean;
+    function isCatchClauseVariableDeclarationOrBindingElement(declaration: Declaration): boolean;
+    function isAmbientModule(node: Node): node is AmbientModuleDeclaration;
+    function isModuleWithStringLiteralName(node: Node): node is ModuleDeclaration;
+    function isNonGlobalAmbientModule(node: Node): node is ModuleDeclaration & {
+        name: StringLiteral;
+    };
+    /**
+     * An effective module (namespace) declaration is either
+     * 1. An actual declaration: namespace X { ... }
+     * 2. A Javascript declaration, which is:
+     *    An identifier in a nested property access expression: Y in `X.Y.Z = { ... }`
+     */
+    function isEffectiveModuleDeclaration(node: Node): boolean;
+    /** Given a symbol for a module, checks that it is a shorthand ambient module. */
+    function isShorthandAmbientModuleSymbol(moduleSymbol: Symbol): boolean;
+    function isBlockScopedContainerTopLevel(node: Node): boolean;
+    function isGlobalScopeAugmentation(module: ModuleDeclaration): boolean;
+    function isExternalModuleAugmentation(node: Node): node is AmbientModuleDeclaration;
+    function isModuleAugmentationExternal(node: AmbientModuleDeclaration): boolean;
+    function isEffectiveExternalModule(node: SourceFile, compilerOptions: CompilerOptions): boolean;
+    function isBlockScope(node: Node, parentNode: Node): boolean;
+    function isDeclarationWithTypeParameters(node: Node): node is DeclarationWithTypeParameters;
+    function isAnyImportSyntax(node: Node): node is AnyImportSyntax;
+    function isLateVisibilityPaintedStatement(node: Node): node is LateVisibilityPaintedStatement;
+    function isAnyImportOrReExport(node: Node): node is AnyImportOrReExport;
+    function getEnclosingBlockScopeContainer(node: Node): Node;
+    function declarationNameToString(name: DeclarationName | QualifiedName): string;
+    function getNameFromIndexInfo(info: IndexInfo): string | undefined;
+    function getTextOfPropertyName(name: PropertyName): __String;
+    function entityNameToString(name: EntityNameOrEntityNameExpression): string;
+    function createDiagnosticForNode(node: Node, message: DiagnosticMessage, arg0?: string | number, arg1?: string | number, arg2?: string | number, arg3?: string | number): DiagnosticWithLocation;
+    function createDiagnosticForNodeArray(sourceFile: SourceFile, nodes: NodeArray<Node>, message: DiagnosticMessage, arg0?: string | number, arg1?: string | number, arg2?: string | number, arg3?: string | number): Diagnostic;
+    function createDiagnosticForNodeInSourceFile(sourceFile: SourceFile, node: Node, message: DiagnosticMessage, arg0?: string | number, arg1?: string | number, arg2?: string | number, arg3?: string | number): DiagnosticWithLocation;
+    function createDiagnosticForNodeFromMessageChain(node: Node, messageChain: DiagnosticMessageChain): DiagnosticWithLocation;
+    function getSpanOfTokenAtPosition(sourceFile: SourceFile, pos: number): TextSpan;
+    function getErrorSpanForNode(sourceFile: SourceFile, node: Node): TextSpan;
+    function isExternalOrCommonJsModule(file: SourceFile): boolean;
+    function isJsonSourceFile(file: SourceFile): file is JsonSourceFile;
+    function isConstEnumDeclaration(node: Node): boolean;
+    function isConst(node: Node): boolean;
+    function isLet(node: Node): boolean;
+    function isSuperCall(n: Node): n is SuperCall;
+    function isImportCall(n: Node): n is ImportCall;
+    function isLiteralImportTypeNode(n: Node): n is LiteralImportTypeNode;
+    function isPrologueDirective(node: Node): node is PrologueDirective;
+    function getLeadingCommentRangesOfNode(node: Node, sourceFileOfNode: SourceFile): CommentRange[] | undefined;
+    function getJSDocCommentRanges(node: Node, text: string): CommentRange[] | undefined;
+    const fullTripleSlashReferencePathRegEx: RegExp;
+    const fullTripleSlashAMDReferencePathRegEx: RegExp;
+    function isPartOfTypeNode(node: Node): boolean;
+    function isChildOfNodeWithKind(node: Node, kind: SyntaxKind): boolean;
+    function forEachReturnStatement<T>(body: Block, visitor: (stmt: ReturnStatement) => T): T | undefined;
+    function forEachYieldExpression(body: Block, visitor: (expr: YieldExpression) => void): void;
+    /**
+     * Gets the most likely element type for a TypeNode. This is not an exhaustive test
+     * as it assumes a rest argument can only be an array type (either T[], or Array<T>).
+     *
+     * @param node The type node.
+     */
+    function getRestParameterElementType(node: TypeNode | undefined): TypeNode | undefined;
+    function getMembersOfDeclaration(node: Declaration): NodeArray<ClassElement | TypeElement | ObjectLiteralElement> | undefined;
+    function isVariableLike(node: Node): node is VariableLikeDeclaration;
+    function isVariableLikeOrAccessor(node: Node): node is AccessorDeclaration | VariableLikeDeclaration;
+    function isVariableDeclarationInVariableStatement(node: VariableDeclaration): boolean;
+    function isValidESSymbolDeclaration(node: Node): node is VariableDeclaration | PropertyDeclaration | SignatureDeclaration;
+    function introducesArgumentsExoticObject(node: Node): boolean;
+    function unwrapInnermostStatementOfLabel(node: LabeledStatement, beforeUnwrapLabelCallback?: (node: LabeledStatement) => void): Statement;
+    function isFunctionBlock(node: Node): boolean;
+    function isObjectLiteralMethod(node: Node): node is MethodDeclaration;
+    function isObjectLiteralOrClassExpressionMethod(node: Node): node is MethodDeclaration;
+    function isIdentifierTypePredicate(predicate: TypePredicate): predicate is IdentifierTypePredicate;
+    function isThisTypePredicate(predicate: TypePredicate): predicate is ThisTypePredicate;
+    function getPropertyAssignment(objectLiteral: ObjectLiteralExpression, key: string, key2?: string): ReadonlyArray<PropertyAssignment>;
+    function getTsConfigObjectLiteralExpression(tsConfigSourceFile: TsConfigSourceFile | undefined): ObjectLiteralExpression | undefined;
+    function getTsConfigPropArrayElementValue(tsConfigSourceFile: TsConfigSourceFile | undefined, propKey: string, elementValue: string): StringLiteral | undefined;
+    function getTsConfigPropArray(tsConfigSourceFile: TsConfigSourceFile | undefined, propKey: string): ReadonlyArray<PropertyAssignment>;
+    function getContainingFunction(node: Node): SignatureDeclaration | undefined;
+    function getContainingClass(node: Node): ClassLikeDeclaration | undefined;
+    function getThisContainer(node: Node, includeArrowFunctions: boolean): Node;
+    function getNewTargetContainer(node: Node): Node | undefined;
+    /**
+     * Given an super call/property node, returns the closest node where
+     * - a super call/property access is legal in the node and not legal in the parent node the node.
+     *   i.e. super call is legal in constructor but not legal in the class body.
+     * - the container is an arrow function (so caller might need to call getSuperContainer again in case it needs to climb higher)
+     * - a super call/property is definitely illegal in the container (but might be legal in some subnode)
+     *   i.e. super property access is illegal in function declaration but can be legal in the statement list
+     */
+    function getSuperContainer(node: Node, stopOnFunctions: boolean): Node;
+    function getImmediatelyInvokedFunctionExpression(func: Node): CallExpression | undefined;
+    /**
+     * Determines whether a node is a property or element access expression for `super`.
+     */
+    function isSuperProperty(node: Node): node is SuperProperty;
+    /**
+     * Determines whether a node is a property or element access expression for `this`.
+     */
+    function isThisProperty(node: Node): boolean;
+    function getEntityNameFromTypeNode(node: TypeNode): EntityNameOrEntityNameExpression | undefined;
+    function getInvokedExpression(node: CallLikeExpression): Expression;
+    function nodeCanBeDecorated(node: ClassDeclaration): true;
+    function nodeCanBeDecorated(node: ClassElement, parent: Node): boolean;
+    function nodeCanBeDecorated(node: Node, parent: Node, grandparent: Node): boolean;
+    function nodeIsDecorated(node: ClassDeclaration): boolean;
+    function nodeIsDecorated(node: ClassElement, parent: Node): boolean;
+    function nodeIsDecorated(node: Node, parent: Node, grandparent: Node): boolean;
+    function nodeOrChildIsDecorated(node: ClassDeclaration): boolean;
+    function nodeOrChildIsDecorated(node: ClassElement, parent: Node): boolean;
+    function nodeOrChildIsDecorated(node: Node, parent: Node, grandparent: Node): boolean;
+    function childIsDecorated(node: ClassDeclaration): boolean;
+    function childIsDecorated(node: Node, parent: Node): boolean;
+    function isJSXTagName(node: Node): boolean;
+    function isExpressionNode(node: Node): boolean;
+    function isInExpressionContext(node: Node): boolean;
+    function isExternalModuleImportEqualsDeclaration(node: Node): boolean;
+    function getExternalModuleImportEqualsDeclarationExpression(node: Node): Expression;
+    function isInternalModuleImportEqualsDeclaration(node: Node): node is ImportEqualsDeclaration;
+    function isSourceFileJavaScript(file: SourceFile): boolean;
+    function isSourceFileNotJavaScript(file: SourceFile): boolean;
+    function isInJavaScriptFile(node: Node | undefined): boolean;
+    function isInJsonFile(node: Node | undefined): boolean;
+    function isInJSDoc(node: Node | undefined): boolean;
+    function isJSDocIndexSignature(node: TypeReferenceNode | ExpressionWithTypeArguments): boolean | undefined;
+    /**
+     * Returns true if the node is a CallExpression to the identifier 'require' with
+     * exactly one argument (of the form 'require("name")').
+     * This function does not test if the node is in a JavaScript file or not.
+     */
+    function isRequireCall(callExpression: Node, checkArgumentIsStringLiteralLike: true): callExpression is RequireOrImportCall & {
+        expression: Identifier;
+        arguments: [StringLiteralLike];
+    };
+    function isRequireCall(callExpression: Node, checkArgumentIsStringLiteralLike: boolean): callExpression is CallExpression;
+    function isSingleOrDoubleQuote(charCode: number): boolean;
+    function isStringDoubleQuoted(str: StringLiteralLike, sourceFile: SourceFile): boolean;
+    function getDeclarationOfJSInitializer(node: Node): Node | undefined;
+    /** Get the initializer, taking into account defaulted Javascript initializers */
+    function getEffectiveInitializer(node: HasExpressionInitializer): Expression | undefined;
+    /**
+     * Get the assignment 'initializer' -- the righthand side-- when the initializer is container-like (See getJavascriptInitializer).
+     * We treat the right hand side of assignments with container-like initalizers as declarations.
+     */
+    function getAssignedJavascriptInitializer(node: Node): Expression | undefined;
+    /**
+     * Recognized Javascript container-like initializers are:
+     * 1. (function() {})() -- IIFEs
+     * 2. function() { } -- Function expressions
+     * 3. class { } -- Class expressions
+     * 4. {} -- Empty object literals
+     * 5. { ... } -- Non-empty object literals, when used to initialize a prototype, like `C.prototype = { m() { } }`
+     *
+     * This function returns the provided initializer, or undefined if it is not valid.
+     */
+    function getJavascriptInitializer(initializer: Node, isPrototypeAssignment: boolean): Expression | undefined;
+    function isDefaultedJavascriptInitializer(node: BinaryExpression): boolean | undefined;
+    /** Given a Javascript initializer, return the outer name. That is, the lhs of the assignment or the declaration name. */
+    function getOuterNameOfJsInitializer(node: Declaration): DeclarationName | undefined;
+    function getRightMostAssignedExpression(node: Expression): Expression;
+    function isExportsIdentifier(node: Node): boolean;
+    function isModuleExportsPropertyAccessExpression(node: Node): boolean;
+    function getSpecialPropertyAssignmentKind(expr: BinaryExpression): SpecialPropertyAssignmentKind;
+    function getInitializerOfBinaryExpression(expr: BinaryExpression): Expression;
+    function isPrototypePropertyAssignment(node: Node): boolean;
+    function isSpecialPropertyDeclaration(expr: PropertyAccessExpression): boolean;
+    function importFromModuleSpecifier(node: StringLiteralLike): AnyValidImportOrReExport;
+    function tryGetImportFromModuleSpecifier(node: StringLiteralLike): AnyValidImportOrReExport | undefined;
+    function getExternalModuleName(node: AnyImportOrReExport | ImportTypeNode): Expression | undefined;
+    function getNamespaceDeclarationNode(node: ImportDeclaration | ImportEqualsDeclaration | ExportDeclaration): ImportEqualsDeclaration | NamespaceImport | undefined;
+    function isDefaultImport(node: ImportDeclaration | ImportEqualsDeclaration | ExportDeclaration): boolean;
+    function hasQuestionToken(node: Node): boolean;
+    function isJSDocConstructSignature(node: Node): boolean;
+    function isJSDocTypeAlias(node: Node): node is JSDocTypedefTag | JSDocCallbackTag;
+    function isTypeAlias(node: Node): node is JSDocTypedefTag | JSDocCallbackTag | TypeAliasDeclaration;
+    function getJSDocCommentsAndTags(hostNode: Node): ReadonlyArray<JSDoc | JSDocTag>;
+    /** Does the opposite of `getJSDocParameterTags`: given a JSDoc parameter, finds the parameter corresponding to it. */
+    function getParameterSymbolFromJSDoc(node: JSDocParameterTag): Symbol | undefined;
+    function getHostSignatureFromJSDoc(node: Node): SignatureDeclaration | undefined;
+    function getHostSignatureFromJSDocHost(host: HasJSDoc): SignatureDeclaration | undefined;
+    function getJSDocHost(node: Node): HasJSDoc;
+    function getTypeParameterFromJsDoc(node: TypeParameterDeclaration & {
+        parent: JSDocTemplateTag;
+    }): TypeParameterDeclaration | undefined;
+    function hasRestParameter(s: SignatureDeclaration | JSDocSignature): boolean;
+    function isRestParameter(node: ParameterDeclaration | JSDocParameterTag): boolean;
+    enum AssignmentKind {
+        None = 0,
+        Definite = 1,
+        Compound = 2
+    }
+    function getAssignmentTargetKind(node: Node): AssignmentKind;
+    function isAssignmentTarget(node: Node): boolean;
+    type NodeWithPossibleHoistedDeclaration = Block | VariableStatement | WithStatement | IfStatement | SwitchStatement | CaseBlock | CaseClause | DefaultClause | LabeledStatement | ForStatement | ForInStatement | ForOfStatement | DoStatement | WhileStatement | TryStatement | CatchClause;
+    /**
+     * Indicates whether a node could contain a `var` VariableDeclarationList that contributes to
+     * the same `var` declaration scope as the node's parent.
+     */
+    function isNodeWithPossibleHoistedDeclaration(node: Node): node is NodeWithPossibleHoistedDeclaration;
+    type ValueSignatureDeclaration = FunctionDeclaration | MethodDeclaration | ConstructorDeclaration | AccessorDeclaration | FunctionExpression | ArrowFunction;
+    function isValueSignatureDeclaration(node: Node): node is ValueSignatureDeclaration;
+    function walkUpParenthesizedTypes(node: Node): Node;
+    function walkUpParenthesizedExpressions(node: Node): Node;
+    function skipParentheses(node: Expression): Expression;
+    function skipParentheses(node: Node): Node;
+    function isDeleteTarget(node: Node): boolean;
+    function isNodeDescendantOf(node: Node, ancestor: Node): boolean;
+    function isDeclarationName(name: Node): boolean;
+    function isAnyDeclarationName(name: Node): boolean;
+    function isLiteralComputedPropertyDeclarationName(node: Node): boolean;
+    function isIdentifierName(node: Identifier): boolean;
+    function isAliasSymbolDeclaration(node: Node): boolean;
+    function exportAssignmentIsAlias(node: ExportAssignment | BinaryExpression): boolean;
+    function getClassExtendsHeritageClauseElement(node: ClassLikeDeclaration | InterfaceDeclaration): ExpressionWithTypeArguments | undefined;
+    function getClassImplementsHeritageClauseElements(node: ClassLikeDeclaration): NodeArray<ExpressionWithTypeArguments> | undefined;
+    /** Returns the node in an `extends` or `implements` clause of a class or interface. */
+    function getAllSuperTypeNodes(node: Node): ReadonlyArray<TypeNode>;
+    function getInterfaceBaseTypeNodes(node: InterfaceDeclaration): NodeArray<ExpressionWithTypeArguments> | undefined;
+    function getHeritageClause(clauses: NodeArray<HeritageClause> | undefined, kind: SyntaxKind): HeritageClause | undefined;
+    function tryResolveScriptReference(host: ScriptReferenceHost, sourceFile: SourceFile, reference: FileReference): SourceFile | undefined;
+    function getAncestor(node: Node | undefined, kind: SyntaxKind): Node | undefined;
+    function isKeyword(token: SyntaxKind): boolean;
+    function isContextualKeyword(token: SyntaxKind): boolean;
+    function isNonContextualKeyword(token: SyntaxKind): boolean;
+    function isStringANonContextualKeyword(name: string): boolean;
+    type TriviaKind = SyntaxKind.SingleLineCommentTrivia | SyntaxKind.MultiLineCommentTrivia | SyntaxKind.NewLineTrivia | SyntaxKind.WhitespaceTrivia | SyntaxKind.ShebangTrivia | SyntaxKind.ConflictMarkerTrivia;
+    function isTrivia(token: SyntaxKind): token is TriviaKind;
+    enum FunctionFlags {
+        Normal = 0,
+        Generator = 1,
+        Async = 2,
+        Invalid = 4,
+        AsyncGenerator = 3
+    }
+    function getFunctionFlags(node: SignatureDeclaration | undefined): FunctionFlags;
+    function isAsyncFunction(node: Node): boolean;
+    function isStringOrNumericLiteral(node: Node): node is StringLiteral | NumericLiteral;
+    /**
+     * A declaration has a dynamic name if both of the following are true:
+     *   1. The declaration has a computed property name
+     *   2. The computed name is *not* expressed as Symbol.<name>, where name
+     *      is a property of the Symbol constructor that denotes a built in
+     *      Symbol.
+     */
+    function hasDynamicName(declaration: Declaration): declaration is DynamicNamedDeclaration;
+    function isDynamicName(name: DeclarationName): boolean;
+    /**
+     * Checks if the expression is of the form:
+     *    Symbol.name
+     * where Symbol is literally the word "Symbol", and name is any identifierName
+     */
+    function isWellKnownSymbolSyntactically(node: Expression): boolean;
+    function getPropertyNameForPropertyNameNode(name: DeclarationName): __String | undefined;
+    type PropertyNameLiteral = Identifier | StringLiteralLike | NumericLiteral;
+    function isPropertyNameLiteral(node: Node): node is PropertyNameLiteral;
+    function getTextOfIdentifierOrLiteral(node: PropertyNameLiteral): string;
+    function getEscapedTextOfIdentifierOrLiteral(node: PropertyNameLiteral): __String;
+    function getPropertyNameForKnownSymbolName(symbolName: string): __String;
+    function isKnownSymbol(symbol: Symbol): boolean;
+    /**
+     * Includes the word "Symbol" with unicode escapes
+     */
+    function isESSymbolIdentifier(node: Node): boolean;
+    function isPushOrUnshiftIdentifier(node: Identifier): boolean;
+    function isParameterDeclaration(node: VariableLikeDeclaration): boolean;
+    function getRootDeclaration(node: Node): Node;
+    function nodeStartsNewLexicalEnvironment(node: Node): boolean;
+    function nodeIsSynthesized(range: TextRange): boolean;
+    function getOriginalSourceFile(sourceFile: SourceFile): SourceFile;
+    enum Associativity {
+        Left = 0,
+        Right = 1
+    }
+    function getExpressionAssociativity(expression: Expression): Associativity;
+    function getOperatorAssociativity(kind: SyntaxKind, operator: SyntaxKind, hasArguments?: boolean): Associativity;
+    function getExpressionPrecedence(expression: Expression): number;
+    function getOperator(expression: Expression): SyntaxKind.Unknown | SyntaxKind.EndOfFileToken | SyntaxKind.SingleLineCommentTrivia | SyntaxKind.MultiLineCommentTrivia | SyntaxKind.NewLineTrivia | SyntaxKind.WhitespaceTrivia | SyntaxKind.ShebangTrivia | SyntaxKind.ConflictMarkerTrivia | SyntaxKind.NumericLiteral | SyntaxKind.StringLiteral | SyntaxKind.JsxText | SyntaxKind.JsxTextAllWhiteSpaces | SyntaxKind.RegularExpressionLiteral | SyntaxKind.NoSubstitutionTemplateLiteral | SyntaxKind.TemplateHead | SyntaxKind.TemplateMiddle | SyntaxKind.TemplateTail | SyntaxKind.OpenBraceToken | SyntaxKind.CloseBraceToken | SyntaxKind.OpenParenToken | SyntaxKind.CloseParenToken | SyntaxKind.OpenBracketToken | SyntaxKind.CloseBracketToken | SyntaxKind.DotToken | SyntaxKind.DotDotDotToken | SyntaxKind.SemicolonToken | SyntaxKind.CommaToken | SyntaxKind.LessThanToken | SyntaxKind.LessThanSlashToken | SyntaxKind.GreaterThanToken | SyntaxKind.LessThanEqualsToken | SyntaxKind.GreaterThanEqualsToken | SyntaxKind.EqualsEqualsToken | SyntaxKind.ExclamationEqualsToken | SyntaxKind.EqualsEqualsEqualsToken | SyntaxKind.ExclamationEqualsEqualsToken | SyntaxKind.EqualsGreaterThanToken | SyntaxKind.PlusToken | SyntaxKind.MinusToken | SyntaxKind.AsteriskToken | SyntaxKind.AsteriskAsteriskToken | SyntaxKind.SlashToken | SyntaxKind.PercentToken | SyntaxKind.PlusPlusToken | SyntaxKind.MinusMinusToken | SyntaxKind.LessThanLessThanToken | SyntaxKind.GreaterThanGreaterThanToken | SyntaxKind.GreaterThanGreaterThanGreaterThanToken | SyntaxKind.AmpersandToken | SyntaxKind.BarToken | SyntaxKind.CaretToken | SyntaxKind.ExclamationToken | SyntaxKind.TildeToken | SyntaxKind.AmpersandAmpersandToken | SyntaxKind.BarBarToken | SyntaxKind.QuestionToken | SyntaxKind.ColonToken | SyntaxKind.AtToken | SyntaxKind.EqualsToken | SyntaxKind.PlusEqualsToken | SyntaxKind.MinusEqualsToken | SyntaxKind.AsteriskEqualsToken | SyntaxKind.AsteriskAsteriskEqualsToken | SyntaxKind.SlashEqualsToken | SyntaxKind.PercentEqualsToken | SyntaxKind.LessThanLessThanEqualsToken | SyntaxKind.GreaterThanGreaterThanEqualsToken | SyntaxKind.GreaterThanGreaterThanGreaterThanEqualsToken | SyntaxKind.AmpersandEqualsToken | SyntaxKind.BarEqualsToken | SyntaxKind.CaretEqualsToken | SyntaxKind.Identifier | SyntaxKind.BreakKeyword | SyntaxKind.CaseKeyword | SyntaxKind.CatchKeyword | SyntaxKind.ClassKeyword | SyntaxKind.ConstKeyword | SyntaxKind.ContinueKeyword | SyntaxKind.DebuggerKeyword | SyntaxKind.DefaultKeyword | SyntaxKind.DeleteKeyword | SyntaxKind.DoKeyword | SyntaxKind.ElseKeyword | SyntaxKind.EnumKeyword | SyntaxKind.ExportKeyword | SyntaxKind.ExtendsKeyword | SyntaxKind.FalseKeyword | SyntaxKind.FinallyKeyword | SyntaxKind.ForKeyword | SyntaxKind.FunctionKeyword | SyntaxKind.IfKeyword | SyntaxKind.ImportKeyword | SyntaxKind.InKeyword | SyntaxKind.InstanceOfKeyword | SyntaxKind.NewKeyword | SyntaxKind.NullKeyword | SyntaxKind.ReturnKeyword | SyntaxKind.SuperKeyword | SyntaxKind.SwitchKeyword | SyntaxKind.ThisKeyword | SyntaxKind.ThrowKeyword | SyntaxKind.TrueKeyword | SyntaxKind.TryKeyword | SyntaxKind.TypeOfKeyword | SyntaxKind.VarKeyword | SyntaxKind.VoidKeyword | SyntaxKind.WhileKeyword | SyntaxKind.WithKeyword | SyntaxKind.ImplementsKeyword | SyntaxKind.InterfaceKeyword | SyntaxKind.LetKeyword | SyntaxKind.PackageKeyword | SyntaxKind.PrivateKeyword | SyntaxKind.ProtectedKeyword | SyntaxKind.PublicKeyword | SyntaxKind.StaticKeyword | SyntaxKind.YieldKeyword | SyntaxKind.AbstractKeyword | SyntaxKind.AsKeyword | SyntaxKind.AnyKeyword | SyntaxKind.AsyncKeyword | SyntaxKind.AwaitKeyword | SyntaxKind.BooleanKeyword | SyntaxKind.ConstructorKeyword | SyntaxKind.DeclareKeyword | SyntaxKind.GetKeyword | SyntaxKind.InferKeyword | SyntaxKind.IsKeyword | SyntaxKind.KeyOfKeyword | SyntaxKind.ModuleKeyword | SyntaxKind.NamespaceKeyword | SyntaxKind.NeverKeyword | SyntaxKind.ReadonlyKeyword | SyntaxKind.RequireKeyword | SyntaxKind.NumberKeyword | SyntaxKind.ObjectKeyword | SyntaxKind.SetKeyword | SyntaxKind.StringKeyword | SyntaxKind.SymbolKeyword | SyntaxKind.TypeKeyword | SyntaxKind.UndefinedKeyword | SyntaxKind.UniqueKeyword | SyntaxKind.UnknownKeyword | SyntaxKind.FromKeyword | SyntaxKind.GlobalKeyword | SyntaxKind.OfKeyword | SyntaxKind.QualifiedName | SyntaxKind.ComputedPropertyName | SyntaxKind.TypeParameter | SyntaxKind.Parameter | SyntaxKind.Decorator | SyntaxKind.PropertySignature | SyntaxKind.PropertyDeclaration | SyntaxKind.MethodSignature | SyntaxKind.MethodDeclaration | SyntaxKind.Constructor | SyntaxKind.GetAccessor | SyntaxKind.SetAccessor | SyntaxKind.CallSignature | SyntaxKind.ConstructSignature | SyntaxKind.IndexSignature | SyntaxKind.TypePredicate | SyntaxKind.TypeReference | SyntaxKind.FunctionType | SyntaxKind.ConstructorType | SyntaxKind.TypeQuery | SyntaxKind.TypeLiteral | SyntaxKind.ArrayType | SyntaxKind.TupleType | SyntaxKind.UnionType | SyntaxKind.IntersectionType | SyntaxKind.ConditionalType | SyntaxKind.InferType | SyntaxKind.ParenthesizedType | SyntaxKind.ThisType | SyntaxKind.TypeOperator | SyntaxKind.IndexedAccessType | SyntaxKind.MappedType | SyntaxKind.LiteralType | SyntaxKind.ImportType | SyntaxKind.ObjectBindingPattern | SyntaxKind.ArrayBindingPattern | SyntaxKind.BindingElement | SyntaxKind.ArrayLiteralExpression | SyntaxKind.ObjectLiteralExpression | SyntaxKind.PropertyAccessExpression | SyntaxKind.ElementAccessExpression | SyntaxKind.CallExpression | SyntaxKind.NewExpression | SyntaxKind.TaggedTemplateExpression | SyntaxKind.TypeAssertionExpression | SyntaxKind.ParenthesizedExpression | SyntaxKind.FunctionExpression | SyntaxKind.ArrowFunction | SyntaxKind.DeleteExpression | SyntaxKind.TypeOfExpression | SyntaxKind.VoidExpression | SyntaxKind.AwaitExpression | SyntaxKind.ConditionalExpression | SyntaxKind.TemplateExpression | SyntaxKind.YieldExpression | SyntaxKind.SpreadElement | SyntaxKind.ClassExpression | SyntaxKind.OmittedExpression | SyntaxKind.ExpressionWithTypeArguments | SyntaxKind.AsExpression | SyntaxKind.NonNullExpression | SyntaxKind.MetaProperty | SyntaxKind.TemplateSpan | SyntaxKind.SemicolonClassElement | SyntaxKind.Block | SyntaxKind.VariableStatement | SyntaxKind.EmptyStatement | SyntaxKind.ExpressionStatement | SyntaxKind.IfStatement | SyntaxKind.DoStatement | SyntaxKind.WhileStatement | SyntaxKind.ForStatement | SyntaxKind.ForInStatement | SyntaxKind.ForOfStatement | SyntaxKind.ContinueStatement | SyntaxKind.BreakStatement | SyntaxKind.ReturnStatement | SyntaxKind.WithStatement | SyntaxKind.SwitchStatement | SyntaxKind.LabeledStatement | SyntaxKind.ThrowStatement | SyntaxKind.TryStatement | SyntaxKind.DebuggerStatement | SyntaxKind.VariableDeclaration | SyntaxKind.VariableDeclarationList | SyntaxKind.FunctionDeclaration | SyntaxKind.ClassDeclaration | SyntaxKind.InterfaceDeclaration | SyntaxKind.TypeAliasDeclaration | SyntaxKind.EnumDeclaration | SyntaxKind.ModuleDeclaration | SyntaxKind.ModuleBlock | SyntaxKind.CaseBlock | SyntaxKind.NamespaceExportDeclaration | SyntaxKind.ImportEqualsDeclaration | SyntaxKind.ImportDeclaration | SyntaxKind.ImportClause | SyntaxKind.NamespaceImport | SyntaxKind.NamedImports | SyntaxKind.ImportSpecifier | SyntaxKind.ExportAssignment | SyntaxKind.ExportDeclaration | SyntaxKind.NamedExports | SyntaxKind.ExportSpecifier | SyntaxKind.MissingDeclaration | SyntaxKind.ExternalModuleReference | SyntaxKind.JsxElement | SyntaxKind.JsxSelfClosingElement | SyntaxKind.JsxOpeningElement | SyntaxKind.JsxClosingElement | SyntaxKind.JsxFragment | SyntaxKind.JsxOpeningFragment | SyntaxKind.JsxClosingFragment | SyntaxKind.JsxAttribute | SyntaxKind.JsxAttributes | SyntaxKind.JsxSpreadAttribute | SyntaxKind.JsxExpression | SyntaxKind.CaseClause | SyntaxKind.DefaultClause | SyntaxKind.HeritageClause | SyntaxKind.CatchClause | SyntaxKind.PropertyAssignment | SyntaxKind.ShorthandPropertyAssignment | SyntaxKind.SpreadAssignment | SyntaxKind.EnumMember | SyntaxKind.SourceFile | SyntaxKind.Bundle | SyntaxKind.UnparsedSource | SyntaxKind.InputFiles | SyntaxKind.JSDocTypeExpression | SyntaxKind.JSDocAllType | SyntaxKind.JSDocUnknownType | SyntaxKind.JSDocNullableType | SyntaxKind.JSDocNonNullableType | SyntaxKind.JSDocOptionalType | SyntaxKind.JSDocFunctionType | SyntaxKind.JSDocVariadicType | SyntaxKind.JSDocComment | SyntaxKind.JSDocTypeLiteral | SyntaxKind.JSDocSignature | SyntaxKind.JSDocTag | SyntaxKind.JSDocAugmentsTag | SyntaxKind.JSDocClassTag | SyntaxKind.JSDocCallbackTag | SyntaxKind.JSDocParameterTag | SyntaxKind.JSDocReturnTag | SyntaxKind.JSDocTypeTag | SyntaxKind.JSDocTemplateTag | SyntaxKind.JSDocTypedefTag | SyntaxKind.JSDocPropertyTag | SyntaxKind.SyntaxList | SyntaxKind.NotEmittedStatement | SyntaxKind.PartiallyEmittedExpression | SyntaxKind.CommaListExpression | SyntaxKind.MergeDeclarationMarker | SyntaxKind.EndOfDeclarationMarker | SyntaxKind.Count;
+    function getOperatorPrecedence(nodeKind: SyntaxKind, operatorKind: SyntaxKind, hasArguments?: boolean): number;
+    function getBinaryOperatorPrecedence(kind: SyntaxKind): number;
+    function createDiagnosticCollection(): DiagnosticCollection;
+    /**
+     * Based heavily on the abstract 'Quote'/'QuoteJSONString' operation from ECMA-262 (24.3.2.2),
+     * but augmented for a few select characters (e.g. lineSeparator, paragraphSeparator, nextLine)
+     * Note that this doesn't actually wrap the input in double quotes.
+     */
+    function escapeString(s: string, quoteChar?: CharacterCodes.doubleQuote | CharacterCodes.singleQuote | CharacterCodes.backtick): string;
+    function isIntrinsicJsxName(name: __String | string): boolean;
+    function escapeNonAsciiString(s: string, quoteChar?: CharacterCodes.doubleQuote | CharacterCodes.singleQuote | CharacterCodes.backtick): string;
+    function getIndentString(level: number): string;
+    function getIndentSize(): number;
+    function createTextWriter(newLine: string): EmitTextWriter;
+    function getResolvedExternalModuleName(host: EmitHost, file: SourceFile, referenceFile?: SourceFile): string;
+    function getExternalModuleNameFromDeclaration(host: EmitHost, resolver: EmitResolver, declaration: ImportEqualsDeclaration | ImportDeclaration | ExportDeclaration | ModuleDeclaration | ImportTypeNode): string | undefined;
+    /**
+     * Resolves a local path to a path which is absolute to the base of the emit
+     */
+    function getExternalModuleNameFromPath(host: EmitHost, fileName: string, referencePath?: string): string;
+    function getOwnEmitOutputFilePath(sourceFile: SourceFile, host: EmitHost, extension: string): string;
+    function getDeclarationEmitOutputFilePath(sourceFile: SourceFile, host: EmitHost): string;
+    interface EmitFileNames {
+        jsFilePath: string;
+        sourceMapFilePath: string | undefined;
+        declarationFilePath: string | undefined;
+        declarationMapPath: string | undefined;
+        bundleInfoPath: string | undefined;
+    }
+    /**
+     * Gets the source files that are expected to have an emit output.
+     *
+     * Originally part of `forEachExpectedEmitFile`, this functionality was extracted to support
+     * transformations.
+     *
+     * @param host An EmitHost.
+     * @param targetSourceFile An optional target source file to emit.
+     */
+    function getSourceFilesToEmit(host: EmitHost, targetSourceFile?: SourceFile): ReadonlyArray<SourceFile>;
+    /** Don't call this for `--outFile`, just for `--outDir` or plain emit. `--outFile` needs additional checks. */
+    function sourceFileMayBeEmitted(sourceFile: SourceFile, options: CompilerOptions, isSourceFileFromExternalLibrary: (file: SourceFile) => boolean): boolean;
+    function getSourceFilePathInNewDir(sourceFile: SourceFile, host: EmitHost, newDirPath: string): string;
+    function writeFile(host: EmitHost, diagnostics: DiagnosticCollection, fileName: string, data: string, writeByteOrderMark: boolean, sourceFiles?: ReadonlyArray<SourceFile>): void;
+    function getLineOfLocalPosition(currentSourceFile: SourceFile, pos: number): number;
+    function getLineOfLocalPositionFromLineMap(lineMap: ReadonlyArray<number>, pos: number): number;
+    function getFirstConstructorWithBody(node: ClassLikeDeclaration): ConstructorDeclaration | undefined;
+    /** Get the type annotation for the value parameter. */
+    function getSetAccessorTypeAnnotationNode(accessor: SetAccessorDeclaration): TypeNode | undefined;
+    function getThisParameter(signature: SignatureDeclaration | JSDocSignature): ParameterDeclaration | undefined;
+    function parameterIsThisKeyword(parameter: ParameterDeclaration): boolean;
+    function isThisIdentifier(node: Node | undefined): boolean;
+    function identifierIsThisKeyword(id: Identifier): boolean;
+    function getAllAccessorDeclarations(declarations: NodeArray<Declaration>, accessor: AccessorDeclaration): AllAccessorDeclarations;
+    /**
+     * Gets the effective type annotation of a variable, parameter, or property. If the node was
+     * parsed in a JavaScript file, gets the type annotation from JSDoc.
+     */
+    function getEffectiveTypeAnnotationNode(node: Node): TypeNode | undefined;
+    function getTypeAnnotationNode(node: Node): TypeNode | undefined;
+    /**
+     * Gets the effective return type annotation of a signature. If the node was parsed in a
+     * JavaScript file, gets the return type annotation from JSDoc.
+     */
+    function getEffectiveReturnTypeNode(node: SignatureDeclaration | JSDocSignature): TypeNode | undefined;
+    /**
+     * Gets the effective type parameters. If the node was parsed in a
+     * JavaScript file, gets the type parameters from the `@template` tag from JSDoc.
+     */
+    function getEffectiveTypeParameterDeclarations(node: DeclarationWithTypeParameters): ReadonlyArray<TypeParameterDeclaration>;
+    function getJSDocTypeParameterDeclarations(node: DeclarationWithTypeParameters): ReadonlyArray<TypeParameterDeclaration>;
+    /**
+     * Gets the effective type annotation of the value parameter of a set accessor. If the node
+     * was parsed in a JavaScript file, gets the type annotation from JSDoc.
+     */
+    function getEffectiveSetAccessorTypeAnnotationNode(node: SetAccessorDeclaration): TypeNode | undefined;
+    function emitNewLineBeforeLeadingComments(lineMap: ReadonlyArray<number>, writer: EmitTextWriter, node: TextRange, leadingComments: ReadonlyArray<CommentRange> | undefined): void;
+    function emitNewLineBeforeLeadingCommentsOfPosition(lineMap: ReadonlyArray<number>, writer: EmitTextWriter, pos: number, leadingComments: ReadonlyArray<CommentRange> | undefined): void;
+    function emitNewLineBeforeLeadingCommentOfPosition(lineMap: ReadonlyArray<number>, writer: EmitTextWriter, pos: number, commentPos: number): void;
+    function emitComments(text: string, lineMap: ReadonlyArray<number>, writer: EmitTextWriter, comments: ReadonlyArray<CommentRange> | undefined, leadingSeparator: boolean, trailingSeparator: boolean, newLine: string, writeComment: (text: string, lineMap: ReadonlyArray<number>, writer: EmitTextWriter, commentPos: number, commentEnd: number, newLine: string) => void): void;
+    /**
+     * Detached comment is a comment at the top of file or function body that is separated from
+     * the next statement by space.
+     */
+    function emitDetachedComments(text: string, lineMap: ReadonlyArray<number>, writer: EmitTextWriter, writeComment: (text: string, lineMap: ReadonlyArray<number>, writer: EmitTextWriter, commentPos: number, commentEnd: number, newLine: string) => void, node: TextRange, newLine: string, removeComments: boolean): {
+        nodePos: number;
+        detachedCommentEndPos: number;
+    } | undefined;
+    function writeCommentRange(text: string, lineMap: ReadonlyArray<number>, writer: EmitTextWriter, commentPos: number, commentEnd: number, newLine: string): void;
+    function hasModifiers(node: Node): boolean;
+    function hasModifier(node: Node, flags: ModifierFlags): boolean;
+    function hasStaticModifier(node: Node): boolean;
+    function hasReadonlyModifier(node: Node): boolean;
+    function getSelectedModifierFlags(node: Node, flags: ModifierFlags): ModifierFlags;
+    function getModifierFlags(node: Node): ModifierFlags;
+    function getModifierFlagsNoCache(node: Node): ModifierFlags;
+    function modifierToFlag(token: SyntaxKind): ModifierFlags;
+    function isLogicalOperator(token: SyntaxKind): boolean;
+    function isAssignmentOperator(token: SyntaxKind): boolean;
+    /** Get `C` given `N` if `N` is in the position `class C extends N` where `N` is an ExpressionWithTypeArguments. */
+    function tryGetClassExtendingExpressionWithTypeArguments(node: Node): ClassLikeDeclaration | undefined;
+    function isAssignmentExpression(node: Node, excludeCompoundAssignment: true): node is AssignmentExpression<EqualsToken>;
+    function isAssignmentExpression(node: Node, excludeCompoundAssignment?: false): node is AssignmentExpression<AssignmentOperatorToken>;
+    function isDestructuringAssignment(node: Node): node is DestructuringAssignment;
+    function isExpressionWithTypeArgumentsInClassExtendsClause(node: Node): boolean;
+    function isExpressionWithTypeArgumentsInClassImplementsClause(node: Node): node is ExpressionWithTypeArguments;
+    function isEntityNameExpression(node: Node): node is EntityNameExpression;
+    function isPropertyAccessEntityNameExpression(node: Node): node is PropertyAccessEntityNameExpression;
+    function isPrototypeAccess(node: Node): node is PropertyAccessExpression;
+    function isRightSideOfQualifiedNameOrPropertyAccess(node: Node): boolean;
+    function isEmptyObjectLiteral(expression: Node): boolean;
+    function isEmptyArrayLiteral(expression: Node): boolean;
+    function getLocalSymbolForExportDefault(symbol: Symbol): Symbol | undefined;
+    /** Return ".ts", ".d.ts", or ".tsx", if that is the extension. */
+    function tryExtractTypeScriptExtension(fileName: string): string | undefined;
+    /**
+     * Converts a string to a base-64 encoded ASCII string.
+     */
+    function convertToBase64(input: string): string;
+    function base64encode(host: {
+        base64encode?(input: string): string;
+    } | undefined, input: string): string;
+    function base64decode(host: {
+        base64decode?(input: string): string;
+    } | undefined, input: string): string;
+    function getNewLineCharacter(options: CompilerOptions | PrinterOptions, getNewLine?: () => string): string;
+    function formatSyntaxKind(kind: SyntaxKind | undefined): string;
+    function formatModifierFlags(flags: ModifierFlags | undefined): string;
+    function formatTransformFlags(flags: TransformFlags | undefined): string;
+    function formatEmitFlags(flags: EmitFlags | undefined): string;
+    function formatSymbolFlags(flags: SymbolFlags | undefined): string;
+    function formatTypeFlags(flags: TypeFlags | undefined): string;
+    function formatObjectFlags(flags: ObjectFlags | undefined): string;
+    /**
+     * Creates a new TextRange from the provided pos and end.
+     *
+     * @param pos The start position.
+     * @param end The end position.
+     */
+    function createRange(pos: number, end: number): TextRange;
+    /**
+     * Creates a new TextRange from a provided range with a new end position.
+     *
+     * @param range A TextRange.
+     * @param end The new end position.
+     */
+    function moveRangeEnd(range: TextRange, end: number): TextRange;
+    /**
+     * Creates a new TextRange from a provided range with a new start position.
+     *
+     * @param range A TextRange.
+     * @param pos The new Start position.
+     */
+    function moveRangePos(range: TextRange, pos: number): TextRange;
+    /**
+     * Moves the start position of a range past any decorators.
+     */
+    function moveRangePastDecorators(node: Node): TextRange;
+    /**
+     * Moves the start position of a range past any decorators or modifiers.
+     */
+    function moveRangePastModifiers(node: Node): TextRange;
+    /**
+     * Determines whether a TextRange has the same start and end positions.
+     *
+     * @param range A TextRange.
+     */
+    function isCollapsedRange(range: TextRange): boolean;
+    /**
+     * Creates a new TextRange for a token at the provides start position.
+     *
+     * @param pos The start position.
+     * @param token The token.
+     */
+    function createTokenRange(pos: number, token: SyntaxKind): TextRange;
+    function rangeIsOnSingleLine(range: TextRange, sourceFile: SourceFile): boolean;
+    function rangeStartPositionsAreOnSameLine(range1: TextRange, range2: TextRange, sourceFile: SourceFile): boolean;
+    function rangeEndPositionsAreOnSameLine(range1: TextRange, range2: TextRange, sourceFile: SourceFile): boolean;
+    function rangeStartIsOnSameLineAsRangeEnd(range1: TextRange, range2: TextRange, sourceFile: SourceFile): boolean;
+    function rangeEndIsOnSameLineAsRangeStart(range1: TextRange, range2: TextRange, sourceFile: SourceFile): boolean;
+    function positionsAreOnSameLine(pos1: number, pos2: number, sourceFile: SourceFile): boolean;
+    function getStartPositionOfRange(range: TextRange, sourceFile: SourceFile): number;
+    /**
+     * Determines whether a name was originally the declaration name of an enum or namespace
+     * declaration.
+     */
+    function isDeclarationNameOfEnumOrNamespace(node: Identifier): boolean;
+    function getInitializedVariables(node: VariableDeclarationList): ReadonlyArray<VariableDeclaration>;
+    function isWatchSet(options: CompilerOptions): boolean | undefined;
+    function getCheckFlags(symbol: Symbol): CheckFlags;
+    function getDeclarationModifierFlagsFromSymbol(s: Symbol): ModifierFlags;
+    function skipAlias(symbol: Symbol, checker: TypeChecker): Symbol;
+    /** See comment on `declareModuleMember` in `binder.ts`. */
+    function getCombinedLocalAndExportSymbolFlags(symbol: Symbol): SymbolFlags;
+    function isWriteOnlyAccess(node: Node): boolean;
+    function isWriteAccess(node: Node): boolean;
+    function compareDataObjects(dst: any, src: any): boolean;
+    /**
+     * clears already present map by calling onDeleteExistingValue callback before deleting that key/value
+     */
+    function clearMap<T>(map: Map<T>, onDeleteValue: (valueInMap: T, key: string) => void): void;
+    interface MutateMapOptions<T, U> {
+        createNewValue(key: string, valueInNewMap: U): T;
+        onDeleteValue(existingValue: T, key: string): void;
+        /**
+         * If present this is called with the key when there is value for that key both in new map as well as existing map provided
+         * Caller can then decide to update or remove this key.
+         * If the key is removed, caller will get callback of createNewValue for that key.
+         * If this callback is not provided, the value of such keys is not updated.
+         */
+        onExistingValue?(existingValue: T, valueInNewMap: U, key: string): void;
+    }
+    /**
+     * Mutates the map with newMap such that keys in map will be same as newMap.
+     */
+    function mutateMap<T, U>(map: Map<T>, newMap: ReadonlyMap<U>, options: MutateMapOptions<T, U>): void;
+    /** Calls `callback` on `directory` and every ancestor directory it has, returning the first defined result. */
+    function forEachAncestorDirectory<T>(directory: string, callback: (directory: string) => T | undefined): T | undefined;
+    function isAbstractConstructorType(type: Type): boolean;
+    function isAbstractConstructorSymbol(symbol: Symbol): boolean;
+    function getClassLikeDeclarationOfSymbol(symbol: Symbol): ClassLikeDeclaration | undefined;
+    function getObjectFlags(type: Type): ObjectFlags;
+    function typeHasCallOrConstructSignatures(type: Type, checker: TypeChecker): boolean;
+    function forSomeAncestorDirectory(directory: string, callback: (directory: string) => boolean): boolean;
+    function isUMDExportSymbol(symbol: Symbol | undefined): boolean | undefined;
+    function showModuleSpecifier({ moduleSpecifier }: ImportDeclaration): string;
+    function getLastChild(node: Node): Node | undefined;
+    /** Add a value to a set, and return true if it wasn't already present. */
+    function addToSeen(seen: Map<true>, key: string | number): boolean;
+    function addToSeen<T>(seen: Map<T>, key: string | number, value: T): boolean;
+    function isObjectTypeDeclaration(node: Node): node is ObjectTypeDeclaration;
+}
+declare namespace ts {
+    function getDefaultLibFileName(options: CompilerOptions): string;
+    function textSpanEnd(span: TextSpan): number;
+    function textSpanIsEmpty(span: TextSpan): boolean;
+    function textSpanContainsPosition(span: TextSpan, position: number): boolean;
+    function textSpanContainsTextSpan(span: TextSpan, other: TextSpan): boolean;
+    function textSpanOverlapsWith(span: TextSpan, other: TextSpan): boolean;
+    function textSpanOverlap(span1: TextSpan, span2: TextSpan): TextSpan | undefined;
+    function textSpanIntersectsWithTextSpan(span: TextSpan, other: TextSpan): boolean;
+    function textSpanIntersectsWith(span: TextSpan, start: number, length: number): boolean;
+    function decodedTextSpanIntersectsWith(start1: number, length1: number, start2: number, length2: number): boolean;
+    function textSpanIntersectsWithPosition(span: TextSpan, position: number): boolean;
+    function textSpanIntersection(span1: TextSpan, span2: TextSpan): TextSpan | undefined;
+    function createTextSpan(start: number, length: number): TextSpan;
+    function createTextRange(pos: number, end?: number): TextRange;
+    function createTextSpanFromBounds(start: number, end: number): TextSpan;
+    function textChangeRangeNewSpan(range: TextChangeRange): TextSpan;
+    function textChangeRangeIsUnchanged(range: TextChangeRange): boolean;
+    function createTextChangeRange(span: TextSpan, newLength: number): TextChangeRange;
+    let unchangedTextChangeRange: TextChangeRange;
+    /**
+     * Called to merge all the changes that occurred across several versions of a script snapshot
+     * into a single change.  i.e. if a user keeps making successive edits to a script we will
+     * have a text change from V1 to V2, V2 to V3, ..., Vn.
+     *
+     * This function will then merge those changes into a single change range valid between V1 and
+     * Vn.
+     */
+    function collapseTextChangeRangesAcrossMultipleVersions(changes: ReadonlyArray<TextChangeRange>): TextChangeRange;
+    function getTypeParameterOwner(d: Declaration): Declaration | undefined;
+    type ParameterPropertyDeclaration = ParameterDeclaration & {
+        parent: ConstructorDeclaration;
+        name: Identifier;
+    };
+    function isParameterPropertyDeclaration(node: Node): node is ParameterPropertyDeclaration;
+    function isEmptyBindingPattern(node: BindingName): node is BindingPattern;
+    function isEmptyBindingElement(node: BindingElement): boolean;
+    function getCombinedModifierFlags(node: Node): ModifierFlags;
+    function getCombinedNodeFlags(node: Node): NodeFlags;
+    /**
+     * Checks to see if the locale is in the appropriate format,
+     * and if it is, attempts to set the appropriate language.
+     */
+    function validateLocaleAndSetLanguage(locale: string, sys: {
+        getExecutingFilePath(): string;
+        resolvePath(path: string): string;
+        fileExists(fileName: string): boolean;
+        readFile(fileName: string): string | undefined;
+    }, errors?: Push<Diagnostic>): void;
+    function getOriginalNode(node: Node): Node;
+    function getOriginalNode<T extends Node>(node: Node, nodeTest: (node: Node) => node is T): T;
+    function getOriginalNode(node: Node | undefined): Node | undefined;
+    function getOriginalNode<T extends Node>(node: Node | undefined, nodeTest: (node: Node | undefined) => node is T): T | undefined;
+    /**
+     * Gets a value indicating whether a node originated in the parse tree.
+     *
+     * @param node The node to test.
+     */
+    function isParseTreeNode(node: Node): boolean;
+    /**
+     * Gets the original parse tree node for a node.
+     *
+     * @param node The original node.
+     * @returns The original parse tree node if found; otherwise, undefined.
+     */
+    function getParseTreeNode(node: Node): Node;
+    /**
+     * Gets the original parse tree node for a node.
+     *
+     * @param node The original node.
+     * @param nodeTest A callback used to ensure the correct type of parse tree node is returned.
+     * @returns The original parse tree node if found; otherwise, undefined.
+     */
+    function getParseTreeNode<T extends Node>(node: Node | undefined, nodeTest?: (node: Node) => node is T): T | undefined;
+    /**
+     * Remove extra underscore from escaped identifier text content.
+     *
+     * @param identifier The escaped identifier text.
+     * @returns The unescaped identifier text.
+     */
+    function unescapeLeadingUnderscores(identifier: __String): string;
+    function idText(identifier: Identifier): string;
+    function symbolName(symbol: Symbol): string;
+    /**
+     * Remove extra underscore from escaped identifier text content.
+     * @deprecated Use `id.text` for the unescaped text.
+     * @param identifier The escaped identifier text.
+     * @returns The unescaped identifier text.
+     */
+    function unescapeIdentifier(id: string): string;
+    function getNameOfJSDocTypedef(declaration: JSDocTypedefTag): Identifier | undefined;
+    /** @internal */
+    function isNamedDeclaration(node: Node): node is NamedDeclaration & {
+        name: DeclarationName;
+    };
+    function getNameOfDeclaration(declaration: Declaration | Expression): DeclarationName;
+    /**
+     * Gets the JSDoc parameter tags for the node if present.
+     *
+     * @remarks Returns any JSDoc param tag that matches the provided
+     * parameter, whether a param tag on a containing function
+     * expression, or a param tag on a variable declaration whose
+     * initializer is the containing function. The tags closest to the
+     * node are returned first, so in the previous example, the param
+     * tag on the containing function expression would be first.
+     *
+     * Does not return tags for binding patterns, because JSDoc matches
+     * parameters by name and binding patterns do not have a name.
+     */
+    function getJSDocParameterTags(param: ParameterDeclaration): ReadonlyArray<JSDocParameterTag>;
+    /**
+     * Return true if the node has JSDoc parameter tags.
+     *
+     * @remarks Includes parameter tags that are not directly on the node,
+     * for example on a variable declaration whose initializer is a function expression.
+     */
+    function hasJSDocParameterTags(node: FunctionLikeDeclaration | SignatureDeclaration): boolean;
+    /** Gets the JSDoc augments tag for the node if present */
+    function getJSDocAugmentsTag(node: Node): JSDocAugmentsTag | undefined;
+    /** Gets the JSDoc class tag for the node if present */
+    function getJSDocClassTag(node: Node): JSDocClassTag | undefined;
+    /** Gets the JSDoc return tag for the node if present */
+    function getJSDocReturnTag(node: Node): JSDocReturnTag | undefined;
+    /** Gets the JSDoc template tag for the node if present */
+    function getJSDocTemplateTag(node: Node): JSDocTemplateTag | undefined;
+    /** Gets the JSDoc type tag for the node if present and valid */
+    function getJSDocTypeTag(node: Node): JSDocTypeTag | undefined;
+    /**
+     * Gets the type node for the node if provided via JSDoc.
+     *
+     * @remarks The search includes any JSDoc param tag that relates
+     * to the provided parameter, for example a type tag on the
+     * parameter itself, or a param tag on a containing function
+     * expression, or a param tag on a variable declaration whose
+     * initializer is the containing function. The tags closest to the
+     * node are examined first, so in the previous example, the type
+     * tag directly on the node would be returned.
+     */
+    function getJSDocType(node: Node): TypeNode | undefined;
+    /**
+     * Gets the return type node for the node if provided via JSDoc's return tag.
+     *
+     * @remarks `getJSDocReturnTag` just gets the whole JSDoc tag. This function
+     * gets the type from inside the braces.
+     */
+    function getJSDocReturnType(node: Node): TypeNode | undefined;
+    /** Get all JSDoc tags related to a node, including those on parent nodes. */
+    function getJSDocTags(node: Node): ReadonlyArray<JSDocTag>;
+    /** Gets all JSDoc tags of a specified kind, or undefined if not present. */
+    function getAllJSDocTagsOfKind(node: Node, kind: SyntaxKind): ReadonlyArray<JSDocTag>;
+}
+declare namespace ts {
+    function isNumericLiteral(node: Node): node is NumericLiteral;
+    function isStringLiteral(node: Node): node is StringLiteral;
+    function isJsxText(node: Node): node is JsxText;
+    function isRegularExpressionLiteral(node: Node): node is RegularExpressionLiteral;
+    function isNoSubstitutionTemplateLiteral(node: Node): node is NoSubstitutionTemplateLiteral;
+    function isTemplateHead(node: Node): node is TemplateHead;
+    function isTemplateMiddle(node: Node): node is TemplateMiddle;
+    function isTemplateTail(node: Node): node is TemplateTail;
+    function isIdentifier(node: Node): node is Identifier;
+    function isQualifiedName(node: Node): node is QualifiedName;
+    function isComputedPropertyName(node: Node): node is ComputedPropertyName;
+    function isTypeParameterDeclaration(node: Node): node is TypeParameterDeclaration;
+    function isParameter(node: Node): node is ParameterDeclaration;
+    function isDecorator(node: Node): node is Decorator;
+    function isPropertySignature(node: Node): node is PropertySignature;
+    function isPropertyDeclaration(node: Node): node is PropertyDeclaration;
+    function isMethodSignature(node: Node): node is MethodSignature;
+    function isMethodDeclaration(node: Node): node is MethodDeclaration;
+    function isConstructorDeclaration(node: Node): node is ConstructorDeclaration;
+    function isGetAccessorDeclaration(node: Node): node is GetAccessorDeclaration;
+    function isSetAccessorDeclaration(node: Node): node is SetAccessorDeclaration;
+    function isCallSignatureDeclaration(node: Node): node is CallSignatureDeclaration;
+    function isConstructSignatureDeclaration(node: Node): node is ConstructSignatureDeclaration;
+    function isIndexSignatureDeclaration(node: Node): node is IndexSignatureDeclaration;
+    function isGetOrSetAccessorDeclaration(node: Node): node is AccessorDeclaration;
+    function isTypePredicateNode(node: Node): node is TypePredicateNode;
+    function isTypeReferenceNode(node: Node): node is TypeReferenceNode;
+    function isFunctionTypeNode(node: Node): node is FunctionTypeNode;
+    function isConstructorTypeNode(node: Node): node is ConstructorTypeNode;
+    function isTypeQueryNode(node: Node): node is TypeQueryNode;
+    function isTypeLiteralNode(node: Node): node is TypeLiteralNode;
+    function isArrayTypeNode(node: Node): node is ArrayTypeNode;
+    function isTupleTypeNode(node: Node): node is TupleTypeNode;
+    function isUnionTypeNode(node: Node): node is UnionTypeNode;
+    function isIntersectionTypeNode(node: Node): node is IntersectionTypeNode;
+    function isConditionalTypeNode(node: Node): node is ConditionalTypeNode;
+    function isInferTypeNode(node: Node): node is InferTypeNode;
+    function isParenthesizedTypeNode(node: Node): node is ParenthesizedTypeNode;
+    function isThisTypeNode(node: Node): node is ThisTypeNode;
+    function isTypeOperatorNode(node: Node): node is TypeOperatorNode;
+    function isIndexedAccessTypeNode(node: Node): node is IndexedAccessTypeNode;
+    function isMappedTypeNode(node: Node): node is MappedTypeNode;
+    function isLiteralTypeNode(node: Node): node is LiteralTypeNode;
+    function isImportTypeNode(node: Node): node is ImportTypeNode;
+    function isObjectBindingPattern(node: Node): node is ObjectBindingPattern;
+    function isArrayBindingPattern(node: Node): node is ArrayBindingPattern;
+    function isBindingElement(node: Node): node is BindingElement;
+    function isArrayLiteralExpression(node: Node): node is ArrayLiteralExpression;
+    function isObjectLiteralExpression(node: Node): node is ObjectLiteralExpression;
+    function isPropertyAccessExpression(node: Node): node is PropertyAccessExpression;
+    function isElementAccessExpression(node: Node): node is ElementAccessExpression;
+    function isCallExpression(node: Node): node is CallExpression;
+    function isNewExpression(node: Node): node is NewExpression;
+    function isTaggedTemplateExpression(node: Node): node is TaggedTemplateExpression;
+    function isTypeAssertion(node: Node): node is TypeAssertion;
+    function isParenthesizedExpression(node: Node): node is ParenthesizedExpression;
+    function skipPartiallyEmittedExpressions(node: Expression): Expression;
+    function skipPartiallyEmittedExpressions(node: Node): Node;
+    function isFunctionExpression(node: Node): node is FunctionExpression;
+    function isArrowFunction(node: Node): node is ArrowFunction;
+    function isDeleteExpression(node: Node): node is DeleteExpression;
+    function isTypeOfExpression(node: Node): node is TypeOfExpression;
+    function isVoidExpression(node: Node): node is VoidExpression;
+    function isAwaitExpression(node: Node): node is AwaitExpression;
+    function isPrefixUnaryExpression(node: Node): node is PrefixUnaryExpression;
+    function isPostfixUnaryExpression(node: Node): node is PostfixUnaryExpression;
+    function isBinaryExpression(node: Node): node is BinaryExpression;
+    function isConditionalExpression(node: Node): node is ConditionalExpression;
+    function isTemplateExpression(node: Node): node is TemplateExpression;
+    function isYieldExpression(node: Node): node is YieldExpression;
+    function isSpreadElement(node: Node): node is SpreadElement;
+    function isClassExpression(node: Node): node is ClassExpression;
+    function isOmittedExpression(node: Node): node is OmittedExpression;
+    function isExpressionWithTypeArguments(node: Node): node is ExpressionWithTypeArguments;
+    function isAsExpression(node: Node): node is AsExpression;
+    function isNonNullExpression(node: Node): node is NonNullExpression;
+    function isMetaProperty(node: Node): node is MetaProperty;
+    function isTemplateSpan(node: Node): node is TemplateSpan;
+    function isSemicolonClassElement(node: Node): node is SemicolonClassElement;
+    function isBlock(node: Node): node is Block;
+    function isVariableStatement(node: Node): node is VariableStatement;
+    function isEmptyStatement(node: Node): node is EmptyStatement;
+    function isExpressionStatement(node: Node): node is ExpressionStatement;
+    function isIfStatement(node: Node): node is IfStatement;
+    function isDoStatement(node: Node): node is DoStatement;
+    function isWhileStatement(node: Node): node is WhileStatement;
+    function isForStatement(node: Node): node is ForStatement;
+    function isForInStatement(node: Node): node is ForInStatement;
+    function isForOfStatement(node: Node): node is ForOfStatement;
+    function isContinueStatement(node: Node): node is ContinueStatement;
+    function isBreakStatement(node: Node): node is BreakStatement;
+    function isBreakOrContinueStatement(node: Node): node is BreakOrContinueStatement;
+    function isReturnStatement(node: Node): node is ReturnStatement;
+    function isWithStatement(node: Node): node is WithStatement;
+    function isSwitchStatement(node: Node): node is SwitchStatement;
+    function isLabeledStatement(node: Node): node is LabeledStatement;
+    function isThrowStatement(node: Node): node is ThrowStatement;
+    function isTryStatement(node: Node): node is TryStatement;
+    function isDebuggerStatement(node: Node): node is DebuggerStatement;
+    function isVariableDeclaration(node: Node): node is VariableDeclaration;
+    function isVariableDeclarationList(node: Node): node is VariableDeclarationList;
+    function isFunctionDeclaration(node: Node): node is FunctionDeclaration;
+    function isClassDeclaration(node: Node): node is ClassDeclaration;
+    function isInterfaceDeclaration(node: Node): node is InterfaceDeclaration;
+    function isTypeAliasDeclaration(node: Node): node is TypeAliasDeclaration;
+    function isEnumDeclaration(node: Node): node is EnumDeclaration;
+    function isModuleDeclaration(node: Node): node is ModuleDeclaration;
+    function isModuleBlock(node: Node): node is ModuleBlock;
+    function isCaseBlock(node: Node): node is CaseBlock;
+    function isNamespaceExportDeclaration(node: Node): node is NamespaceExportDeclaration;
+    function isImportEqualsDeclaration(node: Node): node is ImportEqualsDeclaration;
+    function isImportDeclaration(node: Node): node is ImportDeclaration;
+    function isImportClause(node: Node): node is ImportClause;
+    function isNamespaceImport(node: Node): node is NamespaceImport;
+    function isNamedImports(node: Node): node is NamedImports;
+    function isImportSpecifier(node: Node): node is ImportSpecifier;
+    function isExportAssignment(node: Node): node is ExportAssignment;
+    function isExportDeclaration(node: Node): node is ExportDeclaration;
+    function isNamedExports(node: Node): node is NamedExports;
+    function isExportSpecifier(node: Node): node is ExportSpecifier;
+    function isMissingDeclaration(node: Node): node is MissingDeclaration;
+    function isExternalModuleReference(node: Node): node is ExternalModuleReference;
+    function isJsxElement(node: Node): node is JsxElement;
+    function isJsxSelfClosingElement(node: Node): node is JsxSelfClosingElement;
+    function isJsxOpeningElement(node: Node): node is JsxOpeningElement;
+    function isJsxClosingElement(node: Node): node is JsxClosingElement;
+    function isJsxFragment(node: Node): node is JsxFragment;
+    function isJsxOpeningFragment(node: Node): node is JsxOpeningFragment;
+    function isJsxClosingFragment(node: Node): node is JsxClosingFragment;
+    function isJsxAttribute(node: Node): node is JsxAttribute;
+    function isJsxAttributes(node: Node): node is JsxAttributes;
+    function isJsxSpreadAttribute(node: Node): node is JsxSpreadAttribute;
+    function isJsxExpression(node: Node): node is JsxExpression;
+    function isCaseClause(node: Node): node is CaseClause;
+    function isDefaultClause(node: Node): node is DefaultClause;
+    function isHeritageClause(node: Node): node is HeritageClause;
+    function isCatchClause(node: Node): node is CatchClause;
+    function isPropertyAssignment(node: Node): node is PropertyAssignment;
+    function isShorthandPropertyAssignment(node: Node): node is ShorthandPropertyAssignment;
+    function isSpreadAssignment(node: Node): node is SpreadAssignment;
+    function isEnumMember(node: Node): node is EnumMember;
+    function isSourceFile(node: Node): node is SourceFile;
+    function isBundle(node: Node): node is Bundle;
+    function isUnparsedSource(node: Node): node is UnparsedSource;
+    function isJSDocTypeExpression(node: Node): node is JSDocTypeExpression;
+    function isJSDocAllType(node: JSDocAllType): node is JSDocAllType;
+    function isJSDocUnknownType(node: Node): node is JSDocUnknownType;
+    function isJSDocNullableType(node: Node): node is JSDocNullableType;
+    function isJSDocNonNullableType(node: Node): node is JSDocNonNullableType;
+    function isJSDocOptionalType(node: Node): node is JSDocOptionalType;
+    function isJSDocFunctionType(node: Node): node is JSDocFunctionType;
+    function isJSDocVariadicType(node: Node): node is JSDocVariadicType;
+    function isJSDoc(node: Node): node is JSDoc;
+    function isJSDocAugmentsTag(node: Node): node is JSDocAugmentsTag;
+    function isJSDocClassTag(node: Node): node is JSDocClassTag;
+    function isJSDocParameterTag(node: Node): node is JSDocParameterTag;
+    function isJSDocReturnTag(node: Node): node is JSDocReturnTag;
+    function isJSDocTypeTag(node: Node): node is JSDocTypeTag;
+    function isJSDocTemplateTag(node: Node): node is JSDocTemplateTag;
+    function isJSDocTypedefTag(node: Node): node is JSDocTypedefTag;
+    function isJSDocPropertyTag(node: Node): node is JSDocPropertyTag;
+    function isJSDocPropertyLikeTag(node: Node): node is JSDocPropertyLikeTag;
+    function isJSDocTypeLiteral(node: Node): node is JSDocTypeLiteral;
+    function isJSDocCallbackTag(node: Node): node is JSDocCallbackTag;
+    function isJSDocSignature(node: Node): node is JSDocSignature;
+}
+declare namespace ts {
+    function isSyntaxList(n: Node): n is SyntaxList;
+    function isNode(node: Node): boolean;
+    function isNodeKind(kind: SyntaxKind): boolean;
+    /**
+     * True if node is of some token syntax kind.
+     * For example, this is true for an IfKeyword but not for an IfStatement.
+     * Literals are considered tokens, except TemplateLiteral, but does include TemplateHead/Middle/Tail.
+     */
+    function isToken(n: Node): boolean;
+    function isNodeArray<T extends Node>(array: ReadonlyArray<T>): array is NodeArray<T>;
+    function isLiteralKind(kind: SyntaxKind): boolean;
+    function isLiteralExpression(node: Node): node is LiteralExpression;
+    function isTemplateLiteralKind(kind: SyntaxKind): boolean;
+    type TemplateLiteralToken = NoSubstitutionTemplateLiteral | TemplateHead | TemplateMiddle | TemplateTail;
+    function isTemplateLiteralToken(node: Node): node is TemplateLiteralToken;
+    function isTemplateMiddleOrTemplateTail(node: Node): node is TemplateMiddle | TemplateTail;
+    function isStringTextContainingNode(node: Node): node is StringLiteral | TemplateLiteralToken;
+    function isGeneratedIdentifier(node: Node): node is GeneratedIdentifier;
+    function isModifierKind(token: SyntaxKind): boolean;
+    function isParameterPropertyModifier(kind: SyntaxKind): boolean;
+    function isClassMemberModifier(idToken: SyntaxKind): boolean;
+    function isModifier(node: Node): node is Modifier;
+    function isEntityName(node: Node): node is EntityName;
+    function isPropertyName(node: Node): node is PropertyName;
+    function isBindingName(node: Node): node is BindingName;
+    function isFunctionLike(node: Node): node is SignatureDeclaration;
+    function isFunctionLikeDeclaration(node: Node): node is FunctionLikeDeclaration;
+    function isFunctionLikeKind(kind: SyntaxKind): boolean;
+    function isFunctionOrModuleBlock(node: Node): boolean;
+    function isClassElement(node: Node): node is ClassElement;
+    function isClassLike(node: Node): node is ClassLikeDeclaration;
+    function isAccessor(node: Node): node is AccessorDeclaration;
+    function isMethodOrAccessor(node: Node): node is MethodDeclaration | AccessorDeclaration;
+    function isTypeElement(node: Node): node is TypeElement;
+    function isClassOrTypeElement(node: Node): node is ClassElement | TypeElement;
+    function isObjectLiteralElementLike(node: Node): node is ObjectLiteralElementLike;
+    /**
+     * Node test that determines whether a node is a valid type node.
+     * This differs from the `isPartOfTypeNode` function which determines whether a node is *part*
+     * of a TypeNode.
+     */
+    function isTypeNode(node: Node): node is TypeNode;
+    function isFunctionOrConstructorTypeNode(node: Node): node is FunctionTypeNode | ConstructorTypeNode;
+    function isBindingPattern(node: Node | undefined): node is BindingPattern;
+    function isAssignmentPattern(node: Node): node is AssignmentPattern;
+    function isArrayBindingElement(node: Node): node is ArrayBindingElement;
+    /**
+     * Determines whether the BindingOrAssignmentElement is a BindingElement-like declaration
+     */
+    function isDeclarationBindingElement(bindingElement: BindingOrAssignmentElement): bindingElement is VariableDeclaration | ParameterDeclaration | BindingElement;
+    /**
+     * Determines whether a node is a BindingOrAssignmentPattern
+     */
+    function isBindingOrAssignmentPattern(node: BindingOrAssignmentElementTarget): node is BindingOrAssignmentPattern;
+    /**
+     * Determines whether a node is an ObjectBindingOrAssignmentPattern
+     */
+    function isObjectBindingOrAssignmentPattern(node: BindingOrAssignmentElementTarget): node is ObjectBindingOrAssignmentPattern;
+    /**
+     * Determines whether a node is an ArrayBindingOrAssignmentPattern
+     */
+    function isArrayBindingOrAssignmentPattern(node: BindingOrAssignmentElementTarget): node is ArrayBindingOrAssignmentPattern;
+    function isPropertyAccessOrQualifiedNameOrImportTypeNode(node: Node): node is PropertyAccessExpression | QualifiedName | ImportTypeNode;
+    function isPropertyAccessOrQualifiedName(node: Node): node is PropertyAccessExpression | QualifiedName;
+    function isCallLikeExpression(node: Node): node is CallLikeExpression;
+    function isCallOrNewExpression(node: Node): node is CallExpression | NewExpression;
+    function isTemplateLiteral(node: Node): node is TemplateLiteral;
+    function isLeftHandSideExpression(node: Node): node is LeftHandSideExpression;
+    function isUnaryExpression(node: Node): node is UnaryExpression;
+    function isUnaryExpressionWithWrite(expr: Node): expr is PrefixUnaryExpression | PostfixUnaryExpression;
+    /**
+     * Determines whether a node is an expression based only on its kind.
+     * Use `isExpressionNode` if not in transforms.
+     */
+    function isExpression(node: Node): node is Expression;
+    function isAssertionExpression(node: Node): node is AssertionExpression;
+    function isPartiallyEmittedExpression(node: Node): node is PartiallyEmittedExpression;
+    function isNotEmittedStatement(node: Node): node is NotEmittedStatement;
+    function isNotEmittedOrPartiallyEmittedNode(node: Node): node is NotEmittedStatement | PartiallyEmittedExpression;
+    function isIterationStatement(node: Node, lookInLabeledStatements: false): node is IterationStatement;
+    function isIterationStatement(node: Node, lookInLabeledStatements: boolean): node is IterationStatement | LabeledStatement;
+    function isForInOrOfStatement(node: Node): node is ForInOrOfStatement;
+    function isConciseBody(node: Node): node is ConciseBody;
+    function isFunctionBody(node: Node): node is FunctionBody;
+    function isForInitializer(node: Node): node is ForInitializer;
+    function isModuleBody(node: Node): node is ModuleBody;
+    function isNamespaceBody(node: Node): node is NamespaceBody;
+    function isJSDocNamespaceBody(node: Node): node is JSDocNamespaceBody;
+    function isNamedImportBindings(node: Node): node is NamedImportBindings;
+    function isModuleOrEnumDeclaration(node: Node): node is ModuleDeclaration | EnumDeclaration;
+    function isDeclaration(node: Node): node is NamedDeclaration;
+    function isDeclarationStatement(node: Node): node is DeclarationStatement;
+    /**
+     * Determines whether the node is a statement that is not also a declaration
+     */
+    function isStatementButNotDeclaration(node: Node): node is Statement;
+    function isStatement(node: Node): node is Statement;
+    function isModuleReference(node: Node): node is ModuleReference;
+    function isJsxTagNameExpression(node: Node): node is JsxTagNameExpression;
+    function isJsxChild(node: Node): node is JsxChild;
+    function isJsxAttributeLike(node: Node): node is JsxAttributeLike;
+    function isStringLiteralOrJsxExpression(node: Node): node is StringLiteral | JsxExpression;
+    function isJsxOpeningLikeElement(node: Node): node is JsxOpeningLikeElement;
+    function isCaseOrDefaultClause(node: Node): node is CaseOrDefaultClause;
+    /** True if node is of some JSDoc syntax kind. */
+    function isJSDocNode(node: Node): boolean;
+    /** True if node is of a kind that may contain comment text. */
+    function isJSDocCommentContainingNode(node: Node): boolean;
+    function isJSDocTag(node: Node): boolean;
+    function isSetAccessor(node: Node): node is SetAccessorDeclaration;
+    function isGetAccessor(node: Node): node is GetAccessorDeclaration;
+    /** True if has jsdoc nodes attached to it. */
+    function hasJSDocNodes(node: Node): node is HasJSDoc;
+    /** True if has type node attached to it. */
+    function hasType(node: Node): node is HasType;
+    function couldHaveType(node: Node): node is HasType;
+    /** True if has initializer node attached to it. */
+    function hasInitializer(node: Node): node is HasInitializer;
+    /** True if has initializer node attached to it. */
+    function hasOnlyExpressionInitializer(node: Node): node is HasExpressionInitializer;
+    function isObjectLiteralElement(node: Node): node is ObjectLiteralElement;
+    function isTypeReferenceType(node: Node): node is TypeReferenceType;
+    function guessIndentation(lines: string[]): number | undefined;
+    function isStringLiteralLike(node: Node): node is StringLiteralLike;
+    /** @internal */
+    function isNamedImportsOrExports(node: Node): node is NamedImportsOrExports;
+    interface ObjectAllocator {
+        getNodeConstructor(): new (kind: SyntaxKind, pos?: number, end?: number) => Node;
+        getTokenConstructor(): new <TKind extends SyntaxKind>(kind: TKind, pos?: number, end?: number) => Token<TKind>;
+        getIdentifierConstructor(): new (kind: SyntaxKind.Identifier, pos?: number, end?: number) => Identifier;
+        getSourceFileConstructor(): new (kind: SyntaxKind.SourceFile, pos?: number, end?: number) => SourceFile;
+        getSymbolConstructor(): new (flags: SymbolFlags, name: __String) => Symbol;
+        getTypeConstructor(): new (checker: TypeChecker, flags: TypeFlags) => Type;
+        getSignatureConstructor(): new (checker: TypeChecker) => Signature;
+        getSourceMapSourceConstructor(): new (fileName: string, text: string, skipTrivia?: (pos: number) => number) => SourceMapSource;
+    }
+    let objectAllocator: ObjectAllocator;
+    function formatStringFromArgs(text: string, args: ArrayLike<string>, baseIndex?: number): string;
+    let localizedDiagnosticMessages: MapLike<string> | undefined;
+    function getLocaleSpecificMessage(message: DiagnosticMessage): string;
+    function createFileDiagnostic(file: SourceFile, start: number, length: number, message: DiagnosticMessage, ...args: (string | number | undefined)[]): DiagnosticWithLocation;
+    function formatMessage(_dummy: any, message: DiagnosticMessage): string;
+    function createCompilerDiagnostic(message: DiagnosticMessage, ...args: (string | number | undefined)[]): Diagnostic;
+    function createCompilerDiagnosticFromMessageChain(chain: DiagnosticMessageChain): Diagnostic;
+    function chainDiagnosticMessages(details: DiagnosticMessageChain | undefined, message: DiagnosticMessage, ...args: (string | undefined)[]): DiagnosticMessageChain;
+    function concatenateDiagnosticMessageChains(headChain: DiagnosticMessageChain, tailChain: DiagnosticMessageChain): DiagnosticMessageChain;
+    function compareDiagnostics(d1: Diagnostic, d2: Diagnostic): Comparison;
+    function getEmitScriptTarget(compilerOptions: CompilerOptions): ScriptTarget;
+    function getEmitModuleKind(compilerOptions: {
+        module?: CompilerOptions["module"];
+        target?: CompilerOptions["target"];
+    }): ModuleKind;
+    function getEmitModuleResolutionKind(compilerOptions: CompilerOptions): ModuleResolutionKind;
+    function unreachableCodeIsError(options: CompilerOptions): boolean;
+    function unusedLabelIsError(options: CompilerOptions): boolean;
+    function getAreDeclarationMapsEnabled(options: CompilerOptions): boolean;
+    function getAllowSyntheticDefaultImports(compilerOptions: CompilerOptions): boolean;
+    function getEmitDeclarations(compilerOptions: CompilerOptions): boolean;
+    type StrictOptionName = "noImplicitAny" | "noImplicitThis" | "strictNullChecks" | "strictFunctionTypes" | "strictPropertyInitialization" | "alwaysStrict";
+    function getStrictOptionValue(compilerOptions: CompilerOptions, flag: StrictOptionName): boolean;
+    function hasZeroOrOneAsteriskCharacter(str: string): boolean;
+    /**
+     * Internally, we represent paths as strings with '/' as the directory separator.
+     * When we make system calls (eg: LanguageServiceHost.getDirectory()),
+     * we expect the host to correctly handle paths in our specified format.
+     */
+    const directorySeparator = "/";
+    /**
+     * Normalize path separators.
+     */
+    function normalizeSlashes(path: string): string;
+    /**
+     * Returns length of the root part of a path or URL (i.e. length of "/", "x:/", "//server/share/, file:///user/files").
+     *
+     * For example:
+     * ```ts
+     * getRootLength("a") === 0                   // ""
+     * getRootLength("/") === 1                   // "/"
+     * getRootLength("c:") === 2                  // "c:"
+     * getRootLength("c:d") === 0                 // ""
+     * getRootLength("c:/") === 3                 // "c:/"
+     * getRootLength("c:\\") === 3                // "c:\\"
+     * getRootLength("//server") === 7            // "//server"
+     * getRootLength("//server/share") === 8      // "//server/"
+     * getRootLength("\\\\server") === 7          // "\\\\server"
+     * getRootLength("\\\\server\\share") === 8   // "\\\\server\\"
+     * getRootLength("file:///path") === 8        // "file:///"
+     * getRootLength("file:///c:") === 10         // "file:///c:"
+     * getRootLength("file:///c:d") === 8         // "file:///"
+     * getRootLength("file:///c:/path") === 11    // "file:///c:/"
+     * getRootLength("file://server") === 13      // "file://server"
+     * getRootLength("file://server/path") === 14 // "file://server/"
+     * getRootLength("http://server") === 13      // "http://server"
+     * getRootLength("http://server/path") === 14 // "http://server/"
+     * ```
+     */
+    function getRootLength(path: string): number;
+    function normalizePath(path: string): string;
+    function normalizePathAndParts(path: string): {
+        path: string;
+        parts: string[];
+    };
+    /**
+     * Returns the path except for its basename. Semantics align with NodeJS's `path.dirname`
+     * except that we support URL's as well.
+     *
+     * ```ts
+     * getDirectoryPath("/path/to/file.ext") === "/path/to"
+     * getDirectoryPath("/path/to/") === "/path"
+     * getDirectoryPath("/") === "/"
+     * ```
+     */
+    function getDirectoryPath(path: Path): Path;
+    /**
+     * Returns the path except for its basename. Semantics align with NodeJS's `path.dirname`
+     * except that we support URL's as well.
+     *
+     * ```ts
+     * getDirectoryPath("/path/to/file.ext") === "/path/to"
+     * getDirectoryPath("/path/to/") === "/path"
+     * getDirectoryPath("/") === "/"
+     * ```
+     */
+    function getDirectoryPath(path: string): string;
+    function isUrl(path: string): boolean;
+    function pathIsRelative(path: string): boolean;
+    /**
+     * Determines whether a path is an absolute path (e.g. starts with `/`, or a dos path
+     * like `c:`, `c:\` or `c:/`).
+     */
+    function isRootedDiskPath(path: string): boolean;
+    /**
+     * Determines whether a path consists only of a path root.
+     */
+    function isDiskPathRoot(path: string): boolean;
+    function convertToRelativePath(absoluteOrRelativePath: string, basePath: string, getCanonicalFileName: (path: string) => string): string;
+    /**
+     * Parse a path into an array containing a root component (at index 0) and zero or more path
+     * components (at indices > 0). The result is not normalized.
+     * If the path is relative, the root component is `""`.
+     * If the path is absolute, the root component includes the first path separator (`/`).
+     */
+    function getPathComponents(path: string, currentDirectory?: string): string[];
+    /**
+     * Reduce an array of path components to a more simplified path by navigating any
+     * `"."` or `".."` entries in the path.
+     */
+    function reducePathComponents(components: ReadonlyArray<string>): string[];
+    /**
+     * Parse a path into an array containing a root component (at index 0) and zero or more path
+     * components (at indices > 0). The result is normalized.
+     * If the path is relative, the root component is `""`.
+     * If the path is absolute, the root component includes the first path separator (`/`).
+     */
+    function getNormalizedPathComponents(path: string, currentDirectory: string | undefined): string[];
+    function getNormalizedAbsolutePath(fileName: string, currentDirectory: string | undefined): string;
+    /**
+     * Formats a parsed path consisting of a root component (at index 0) and zero or more path
+     * segments (at indices > 0).
+     */
+    function getPathFromPathComponents(pathComponents: ReadonlyArray<string>): string;
+    function getRelativePathFromFile(from: string, to: string, getCanonicalFileName: GetCanonicalFileName): string;
+    /**
+     * Gets a relative path that can be used to traverse between `from` and `to`.
+     */
+    function getRelativePathFromDirectory(from: string, to: string, ignoreCase: boolean): string;
+    /**
+     * Gets a relative path that can be used to traverse between `from` and `to`.
+     */
+    function getRelativePathFromDirectory(fromDirectory: string, to: string, getCanonicalFileName: GetCanonicalFileName): string;
+    function getRelativePathToDirectoryOrUrl(directoryPathOrUrl: string, relativeOrAbsolutePath: string, currentDirectory: string, getCanonicalFileName: GetCanonicalFileName, isAbsolutePathAnUrl: boolean): string;
+    /**
+     * Ensures a path is either absolute (prefixed with `/` or `c:`) or dot-relative (prefixed
+     * with `./` or `../`) so as not to be confused with an unprefixed module name.
+     */
+    function ensurePathIsNonModuleName(path: string): string;
+    /**
+     * Returns the path except for its containing directory name.
+     * Semantics align with NodeJS's `path.basename` except that we support URL's as well.
+     *
+     * ```ts
+     * getBaseFileName("/path/to/file.ext") === "file.ext"
+     * getBaseFileName("/path/to/") === "to"
+     * getBaseFileName("/") === ""
+     * ```
+     */
+    function getBaseFileName(path: string): string;
+    /**
+     * Gets the portion of a path following the last (non-terminal) separator (`/`).
+     * Semantics align with NodeJS's `path.basename` except that we support URL's as well.
+     * If the base name has any one of the provided extensions, it is removed.
+     *
+     * ```ts
+     * getBaseFileName("/path/to/file.ext", ".ext", true) === "file"
+     * getBaseFileName("/path/to/file.js", ".ext", true) === "file.js"
+     * ```
+     */
+    function getBaseFileName(path: string, extensions: string | ReadonlyArray<string>, ignoreCase: boolean): string;
+    /**
+     * Combines paths. If a path is absolute, it replaces any previous path.
+     */
+    function combinePaths(path: string, ...paths: (string | undefined)[]): string;
+    /**
+     * Combines and resolves paths. If a path is absolute, it replaces any previous path. Any
+     * `.` and `..` path components are resolved.
+     */
+    function resolvePath(path: string, ...paths: (string | undefined)[]): string;
+    /**
+     * Determines whether a path has a trailing separator (`/` or `\\`).
+     */
+    function hasTrailingDirectorySeparator(path: string): boolean;
+    /**
+     * Removes a trailing directory separator from a path.
+     * @param path The path.
+     */
+    function removeTrailingDirectorySeparator(path: Path): Path;
+    function removeTrailingDirectorySeparator(path: string): string;
+    /**
+     * Adds a trailing directory separator to a path, if it does not already have one.
+     * @param path The path.
+     */
+    function ensureTrailingDirectorySeparator(path: Path): Path;
+    function ensureTrailingDirectorySeparator(path: string): string;
+    /**
+     * Performs a case-sensitive comparison of two paths.
+     */
+    function comparePathsCaseSensitive(a: string, b: string): Comparison;
+    /**
+     * Performs a case-insensitive comparison of two paths.
+     */
+    function comparePathsCaseInsensitive(a: string, b: string): Comparison;
+    function comparePaths(a: string, b: string, ignoreCase?: boolean): Comparison;
+    function comparePaths(a: string, b: string, currentDirectory: string, ignoreCase?: boolean): Comparison;
+    function containsPath(parent: string, child: string, ignoreCase?: boolean): boolean;
+    function containsPath(parent: string, child: string, currentDirectory: string, ignoreCase?: boolean): boolean;
+    function tryRemoveDirectoryPrefix(path: string, dirPath: string): string | undefined;
+    function hasExtension(fileName: string): boolean;
+    const commonPackageFolders: ReadonlyArray<string>;
+    function getRegularExpressionForWildcard(specs: ReadonlyArray<string> | undefined, basePath: string, usage: "files" | "directories" | "exclude"): string | undefined;
+    /**
+     * An "includes" path "foo" is implicitly a glob "foo/** /*" (without the space) if its last component has no extension,
+     * and does not contain any glob characters itself.
+     */
+    function isImplicitGlob(lastPathComponent: string): boolean;
+    interface FileSystemEntries {
+        readonly files: ReadonlyArray<string>;
+        readonly directories: ReadonlyArray<string>;
+    }
+    interface FileMatcherPatterns {
+        /** One pattern for each "include" spec. */
+        includeFilePatterns: ReadonlyArray<string> | undefined;
+        /** One pattern matching one of any of the "include" specs. */
+        includeFilePattern: string | undefined;
+        includeDirectoryPattern: string | undefined;
+        excludePattern: string | undefined;
+        basePaths: ReadonlyArray<string>;
+    }
+    /** @param path directory of the tsconfig.json */
+    function getFileMatcherPatterns(path: string, excludes: ReadonlyArray<string> | undefined, includes: ReadonlyArray<string> | undefined, useCaseSensitiveFileNames: boolean, currentDirectory: string): FileMatcherPatterns;
+    function getRegexFromPattern(pattern: string, useCaseSensitiveFileNames: boolean): RegExp;
+    /** @param path directory of the tsconfig.json */
+    function matchFiles(path: string, extensions: ReadonlyArray<string> | undefined, excludes: ReadonlyArray<string> | undefined, includes: ReadonlyArray<string> | undefined, useCaseSensitiveFileNames: boolean, currentDirectory: string, depth: number | undefined, getFileSystemEntries: (path: string) => FileSystemEntries): string[];
+    function ensureScriptKind(fileName: string, scriptKind: ScriptKind | undefined): ScriptKind;
+    function getScriptKindFromFileName(fileName: string): ScriptKind;
+    /**
+     *  List of supported extensions in order of file resolution precedence.
+     */
+    const supportedTypeScriptExtensions: ReadonlyArray<Extension>;
+    /** Must have ".d.ts" first because if ".ts" goes first, that will be detected as the extension instead of ".d.ts". */
+    const supportedTypescriptExtensionsForExtractExtension: ReadonlyArray<Extension>;
+    const supportedJavascriptExtensions: ReadonlyArray<Extension>;
+    function getSupportedExtensions(options?: CompilerOptions, extraFileExtensions?: ReadonlyArray<FileExtensionInfo>): ReadonlyArray<string>;
+    function hasJavaScriptFileExtension(fileName: string): boolean;
+    function hasTypeScriptFileExtension(fileName: string): boolean;
+    function isSupportedSourceFileName(fileName: string, compilerOptions?: CompilerOptions, extraFileExtensions?: ReadonlyArray<FileExtensionInfo>): boolean;
+    /**
+     * Extension boundaries by priority. Lower numbers indicate higher priorities, and are
+     * aligned to the offset of the highest priority extension in the
+     * allSupportedExtensions array.
+     */
+    enum ExtensionPriority {
+        TypeScriptFiles = 0,
+        DeclarationAndJavaScriptFiles = 2,
+        Highest = 0,
+        Lowest = 2
+    }
+    function getExtensionPriority(path: string, supportedExtensions: ReadonlyArray<string>): ExtensionPriority;
+    /**
+     * Adjusts an extension priority to be the highest priority within the same range.
+     */
+    function adjustExtensionPriority(extensionPriority: ExtensionPriority, supportedExtensions: ReadonlyArray<string>): ExtensionPriority;
+    /**
+     * Gets the next lowest extension priority for a given priority.
+     */
+    function getNextLowestExtensionPriority(extensionPriority: ExtensionPriority, supportedExtensions: ReadonlyArray<string>): ExtensionPriority;
+    function removeFileExtension(path: string): string;
+    function tryRemoveExtension(path: string, extension: string): string | undefined;
+    function removeExtension(path: string, extension: string): string;
+    function changeExtension<T extends string | Path>(path: T, newExtension: string): T;
+    function changeAnyExtension(path: string, ext: string): string;
+    function changeAnyExtension(path: string, ext: string, extensions: string | ReadonlyArray<string>, ignoreCase: boolean): string;
+    namespace Debug {
+        function showSymbol(symbol: Symbol): string;
+        function showSyntaxKind(node: Node): string;
+    }
+    function tryParsePattern(pattern: string): Pattern | undefined;
+    function positionIsSynthesized(pos: number): boolean;
+    /** True if an extension is one of the supported TypeScript extensions. */
+    function extensionIsTypeScript(ext: Extension): boolean;
+    function resolutionExtensionIsTypeScriptOrJson(ext: Extension): boolean;
+    /**
+     * Gets the extension from a path.
+     * Path must have a valid extension.
+     */
+    function extensionFromPath(path: string): Extension;
+    function isAnySupportedFileExtension(path: string): boolean;
+    function tryGetExtensionFromPath(path: string): Extension | undefined;
+    /**
+     * Gets the file extension for a path.
+     */
+    function getAnyExtensionFromPath(path: string): string;
+    /**
+     * Gets the file extension for a path, provided it is one of the provided extensions.
+     */
+    function getAnyExtensionFromPath(path: string, extensions: string | ReadonlyArray<string>, ignoreCase: boolean): string;
+    function isCheckJsEnabledForFile(sourceFile: SourceFile, compilerOptions: CompilerOptions): boolean | undefined;
+    const emptyFileSystemEntries: FileSystemEntries;
+    /**
+     * patternStrings contains both pattern strings (containing "*") and regular strings.
+     * Return an exact match if possible, or a pattern match, or undefined.
+     * (These are verified by verifyCompilerOptions to have 0 or 1 "*" characters.)
+     */
+    function matchPatternOrExact(patternStrings: ReadonlyArray<string>, candidate: string): string | Pattern | undefined;
+}
+declare namespace ts {
+    function createNode(kind: SyntaxKind, pos?: number, end?: number): Node;
+    function isJSDocLikeText(text: string, start: number): boolean;
+    /**
+     * Invokes a callback for each child of the given node. The 'cbNode' callback is invoked for all child nodes
+     * stored in properties. If a 'cbNodes' callback is specified, it is invoked for embedded arrays; otherwise,
+     * embedded arrays are flattened and the 'cbNode' callback is invoked for each element. If a callback returns
+     * a truthy value, iteration stops and that value is returned. Otherwise, undefined is returned.
+     *
+     * @param node a given node to visit its children
+     * @param cbNode a callback to be invoked for all child nodes
+     * @param cbNodes a callback to be invoked for embedded array
+     *
+     * @remarks `forEachChild` must visit the children of a node in the order
+     * that they appear in the source code. The language service depends on this property to locate nodes by position.
+     */
+    function forEachChild<T>(node: Node, cbNode: (node: Node) => T | undefined, cbNodes?: (nodes: NodeArray<Node>) => T | undefined): T | undefined;
+    function createSourceFile(fileName: string, sourceText: string, languageVersion: ScriptTarget, setParentNodes?: boolean, scriptKind?: ScriptKind): SourceFile;
+    function parseIsolatedEntityName(text: string, languageVersion: ScriptTarget): EntityName | undefined;
+    /**
+     * Parse json text into SyntaxTree and return node and parse errors if any
+     * @param fileName
+     * @param sourceText
+     */
+    function parseJsonText(fileName: string, sourceText: string): JsonSourceFile;
+    function isExternalModule(file: SourceFile): boolean;
+    function updateSourceFile(sourceFile: SourceFile, newText: string, textChangeRange: TextChangeRange, aggressiveChecks?: boolean): SourceFile;
+    function parseIsolatedJSDocComment(content: string, start?: number, length?: number): {
+        jsDoc: JSDoc;
+        diagnostics: Diagnostic[];
+    } | undefined;
+    function parseJSDocTypeExpressionForTests(content: string, start?: number, length?: number): {
+        jsDocTypeExpression: JSDocTypeExpression;
+        diagnostics: Diagnostic[];
+    } | undefined;
+    interface PragmaContext {
+        languageVersion: ScriptTarget;
+        pragmas?: PragmaMap;
+        checkJsDirective?: CheckJsDirective;
+        referencedFiles: FileReference[];
+        typeReferenceDirectives: FileReference[];
+        libReferenceDirectives: FileReference[];
+        amdDependencies: AmdDependency[];
+        hasNoDefaultLib?: boolean;
+        moduleName?: string;
+    }
+    function processCommentPragmas(context: PragmaContext, sourceText: string): void;
+    type PragmaDiagnosticReporter = (pos: number, length: number, message: DiagnosticMessage) => void;
+    function processPragmasIntoFields(context: PragmaContext, reportDiagnostic: PragmaDiagnosticReporter): void;
+    /** @internal */
+    function tagNamesAreEquivalent(lhs: JsxTagNameExpression, rhs: JsxTagNameExpression): boolean;
+}
+declare namespace ts {
+    const compileOnSaveCommandLineOption: CommandLineOption;
+    /**
+     * An array of supported "lib" reference file names used to determine the order for inclusion
+     * when referenced, as well as for spelling suggestions. This ensures the correct ordering for
+     * overload resolution when a type declared in one lib is extended by another.
+     */
+    const libs: string[];
+    /**
+     * A map of lib names to lib files. This map is used both for parsing the "lib" command line
+     * option as well as for resolving lib reference directives.
+     */
+    const libMap: Map<string>;
+    const optionDeclarations: CommandLineOption[];
+    const typeAcquisitionDeclarations: CommandLineOption[];
+    interface OptionNameMap {
+        optionNameMap: Map<CommandLineOption>;
+        shortOptionNames: Map<string>;
+    }
+    const defaultInitCompilerOptions: CompilerOptions;
+    function convertEnableAutoDiscoveryToEnable(typeAcquisition: TypeAcquisition): TypeAcquisition;
+    function createCompilerDiagnosticForInvalidCustomType(opt: CommandLineOptionOfCustomType): Diagnostic;
+    function parseCustomTypeOption(opt: CommandLineOptionOfCustomType, value: string, errors: Push<Diagnostic>): string | number | undefined;
+    function parseListTypeOption(opt: CommandLineOptionOfListType, value: string | undefined, errors: Push<Diagnostic>): (string | number)[] | undefined;
+    function parseCommandLine(commandLine: ReadonlyArray<string>, readFile?: (path: string) => string | undefined): ParsedCommandLine;
+    /** @internal */
+    function getOptionFromName(optionName: string, allowShort?: boolean): CommandLineOption | undefined;
+    function printVersion(): void;
+    function printHelp(optionsList: CommandLineOption[], syntaxPrefix?: string): void;
+    type DiagnosticReporter = (diagnostic: Diagnostic) => void;
+    /**
+     * Reports config file diagnostics
+     */
+    interface ConfigFileDiagnosticsReporter {
+        /**
+         * Reports unrecoverable error when parsing config file
+         */
+        onUnRecoverableConfigFileDiagnostic: DiagnosticReporter;
+    }
+    /**
+     * Interface extending ParseConfigHost to support ParseConfigFile that reads config file and reports errors
+     */
+    interface ParseConfigFileHost extends ParseConfigHost, ConfigFileDiagnosticsReporter {
+        getCurrentDirectory(): string;
+    }
+    /**
+     * Reads the config file, reports errors if any and exits if the config file cannot be found
+     */
+    function getParsedCommandLineOfConfigFile(configFileName: string, optionsToExtend: CompilerOptions, host: ParseConfigFileHost): ParsedCommandLine | undefined;
+    /**
+     * Read tsconfig.json file
+     * @param fileName The path to the config file
+     */
+    function readConfigFile(fileName: string, readFile: (path: string) => string | undefined): {
+        config?: any;
+        error?: Diagnostic;
+    };
+    /**
+     * Parse the text of the tsconfig.json file
+     * @param fileName The path to the config file
+     * @param jsonText The text of the config file
+     */
+    function parseConfigFileTextToJson(fileName: string, jsonText: string): {
+        config?: any;
+        error?: Diagnostic;
+    };
+    /**
+     * Read tsconfig.json file
+     * @param fileName The path to the config file
+     */
+    function readJsonConfigFile(fileName: string, readFile: (path: string) => string | undefined): TsConfigSourceFile;
+    interface JsonConversionNotifier {
+        /**
+         * Notifies parent option object is being set with the optionKey and a valid optionValue
+         * Currently it notifies only if there is element with type object (parentOption) and
+         * has element's option declarations map associated with it
+         * @param parentOption parent option name in which the option and value are being set
+         * @param option option declaration which is being set with the value
+         * @param value value of the option
+         */
+        onSetValidOptionKeyValueInParent(parentOption: string, option: CommandLineOption, value: CompilerOptionsValue): void;
+        /**
+         * Notify when valid root key value option is being set
+         * @param key option key
+         * @param keyNode node corresponding to node in the source file
+         * @param value computed value of the key
+         * @param ValueNode node corresponding to value in the source file
+         */
+        onSetValidOptionKeyValueInRoot(key: string, keyNode: PropertyName, value: CompilerOptionsValue, valueNode: Expression): void;
+        /**
+         * Notify when unknown root key value option is being set
+         * @param key option key
+         * @param keyNode node corresponding to node in the source file
+         * @param value computed value of the key
+         * @param ValueNode node corresponding to value in the source file
+         */
+        onSetUnknownOptionKeyValueInRoot(key: string, keyNode: PropertyName, value: CompilerOptionsValue, valueNode: Expression): void;
+    }
+    /**
+     * Convert the json syntax tree into the json value
+     */
+    function convertToObject(sourceFile: JsonSourceFile, errors: Push<Diagnostic>): any;
+    /**
+     * Convert the json syntax tree into the json value and report errors
+     * This returns the json value (apart from checking errors) only if returnValue provided is true.
+     * Otherwise it just checks the errors and returns undefined
+     */
+    function convertToObjectWorker(sourceFile: JsonSourceFile, errors: Push<Diagnostic>, returnValue: boolean, knownRootOptions: CommandLineOption | undefined, jsonConversionNotifier: JsonConversionNotifier | undefined): any;
+    /**
+     * Generate tsconfig configuration when running command line "--init"
+     * @param options commandlineOptions to be generated into tsconfig.json
+     * @param fileNames array of filenames to be generated into tsconfig.json
+     */
+    function generateTSConfig(options: CompilerOptions, fileNames: ReadonlyArray<string>, newLine: string): string;
+    /**
+     * Parse the contents of a config file (tsconfig.json).
+     * @param json The contents of the config file to parse
+     * @param host Instance of ParseConfigHost used to enumerate files in folder.
+     * @param basePath A root directory to resolve relative path entries in the config
+     *    file to. e.g. outDir
+     */
+    function parseJsonConfigFileContent(json: any, host: ParseConfigHost, basePath: string, existingOptions?: CompilerOptions, configFileName?: string, resolutionStack?: Path[], extraFileExtensions?: ReadonlyArray<FileExtensionInfo>): ParsedCommandLine;
+    /**
+     * Parse the contents of a config file (tsconfig.json).
+     * @param jsonNode The contents of the config file to parse
+     * @param host Instance of ParseConfigHost used to enumerate files in folder.
+     * @param basePath A root directory to resolve relative path entries in the config
+     *    file to. e.g. outDir
+     */
+    function parseJsonSourceFileConfigFileContent(sourceFile: TsConfigSourceFile, host: ParseConfigHost, basePath: string, existingOptions?: CompilerOptions, configFileName?: string, resolutionStack?: Path[], extraFileExtensions?: ReadonlyArray<FileExtensionInfo>): ParsedCommandLine;
+    function setConfigFileInOptions(options: CompilerOptions, configFile: TsConfigSourceFile | undefined): void;
+    function isErrorNoInputFiles(error: Diagnostic): boolean;
+    function getErrorForNoInputFiles({ includeSpecs, excludeSpecs }: ConfigFileSpecs, configFileName: string | undefined): Diagnostic;
+    function convertCompilerOptionsFromJson(jsonOptions: any, basePath: string, configFileName?: string): {
+        options: CompilerOptions;
+        errors: Diagnostic[];
+    };
+    function convertTypeAcquisitionFromJson(jsonOptions: any, basePath: string, configFileName?: string): {
+        options: TypeAcquisition;
+        errors: Diagnostic[];
+    };
+    /**
+     * Gets the file names from the provided config file specs that contain, files, include, exclude and
+     * other properties needed to resolve the file names
+     * @param spec The config file specs extracted with file names to include, wildcards to include/exclude and other details
+     * @param basePath The base path for any relative file specifications.
+     * @param options Compiler options.
+     * @param host The host used to resolve files and directories.
+     * @param extraFileExtensions optionaly file extra file extension information from host
+     */
+    function getFileNamesFromConfigSpecs(spec: ConfigFileSpecs, basePath: string, options: CompilerOptions, host: ParseConfigHost, extraFileExtensions?: ReadonlyArray<FileExtensionInfo>): ExpandResult;
+    /**
+     * Produces a cleaned version of compiler options with personally identifiying info (aka, paths) removed.
+     * Also converts enum values back to strings.
+     */
+    function convertCompilerOptionsForTelemetry(opts: CompilerOptions): CompilerOptions;
+}
+declare namespace ts {
+    function trace(host: ModuleResolutionHost, message: DiagnosticMessage, ...args: any[]): void;
+    function isTraceEnabled(compilerOptions: CompilerOptions, host: ModuleResolutionHost): boolean;
+    /** Array that is only intended to be pushed to, never read. */
+    interface Push<T> {
+        push(value: T): void;
+    }
+    function readJson(path: string, host: {
+        readFile(fileName: string): string | undefined;
+    }): object;
+    function getEffectiveTypeRoots(options: CompilerOptions, host: GetEffectiveTypeRootsHost): string[] | undefined;
+    /**
+     * @param {string | undefined} containingFile - file that contains type reference directive, can be undefined if containing file is unknown.
+     * This is possible in case if resolution is performed for directives specified via 'types' parameter. In this case initial path for secondary lookups
+     * is assumed to be the same as root directory of the project.
+     */
+    function resolveTypeReferenceDirective(typeReferenceDirectiveName: string, containingFile: string | undefined, options: CompilerOptions, host: ModuleResolutionHost): ResolvedTypeReferenceDirectiveWithFailedLookupLocations;
+    /**
+     * Given a set of options, returns the set of type directive names
+     *   that should be included for this program automatically.
+     * This list could either come from the config file,
+     *   or from enumerating the types root + initial secondary types lookup location.
+     * More type directives might appear in the program later as a result of loading actual source files;
+     *   this list is only the set of defaults that are implicitly included.
+     */
+    function getAutomaticTypeDirectiveNames(options: CompilerOptions, host: ModuleResolutionHost): string[];
+    /**
+     * Cached module resolutions per containing directory.
+     * This assumes that any module id will have the same resolution for sibling files located in the same folder.
+     */
+    interface ModuleResolutionCache extends NonRelativeModuleNameResolutionCache {
+        getOrCreateCacheForDirectory(directoryName: string): Map<ResolvedModuleWithFailedLookupLocations>;
+    }
+    /**
+     * Stored map from non-relative module name to a table: directory -> result of module lookup in this directory
+     * We support only non-relative module names because resolution of relative module names is usually more deterministic and thus less expensive.
+     */
+    interface NonRelativeModuleNameResolutionCache {
+        getOrCreateCacheForModuleName(nonRelativeModuleName: string): PerModuleNameCache;
+    }
+    interface PerModuleNameCache {
+        get(directory: string): ResolvedModuleWithFailedLookupLocations | undefined;
+        set(directory: string, result: ResolvedModuleWithFailedLookupLocations): void;
+    }
+    function createModuleResolutionCache(currentDirectory: string, getCanonicalFileName: (s: string) => string): ModuleResolutionCache;
+    function createModuleResolutionCacheWithMaps(directoryToModuleNameMap: Map<Map<ResolvedModuleWithFailedLookupLocations>>, moduleNameToDirectoryMap: Map<PerModuleNameCache>, currentDirectory: string, getCanonicalFileName: GetCanonicalFileName): ModuleResolutionCache;
+    function resolveModuleNameFromCache(moduleName: string, containingFile: string, cache: ModuleResolutionCache): ResolvedModuleWithFailedLookupLocations | undefined;
+    function resolveModuleName(moduleName: string, containingFile: string, compilerOptions: CompilerOptions, host: ModuleResolutionHost, cache?: ModuleResolutionCache): ResolvedModuleWithFailedLookupLocations;
+    function nodeModuleNameResolver(moduleName: string, containingFile: string, compilerOptions: CompilerOptions, host: ModuleResolutionHost, cache?: ModuleResolutionCache): ResolvedModuleWithFailedLookupLocations;
+    /**
+     * Expose resolution logic to allow us to use Node module resolution logic from arbitrary locations.
+     * No way to do this with `require()`: https://github.com/nodejs/node/issues/5963
+     * Throws an error if the module can't be resolved.
+     */
+    function resolveJavaScriptModule(moduleName: string, initialDir: string, host: ModuleResolutionHost): string;
+    function directoryProbablyExists(directoryName: string, host: {
+        directoryExists?: (directoryName: string) => boolean;
+    }): boolean;
+    function getPackageName(moduleName: string): {
+        packageName: string;
+        rest: string;
+    };
+    function getTypesPackageName(packageName: string): string;
+    function getMangledNameForScopedPackage(packageName: string): string;
+    function getPackageNameFromAtTypesDirectory(mangledName: string): string;
+    function getUnmangledNameForScopedPackage(typesPackageName: string): string;
+    function classicNameResolver(moduleName: string, containingFile: string, compilerOptions: CompilerOptions, host: ModuleResolutionHost, cache?: NonRelativeModuleNameResolutionCache): ResolvedModuleWithFailedLookupLocations;
+    /**
+     * LSHost may load a module from a global cache of typings.
+     * This is the minumum code needed to expose that functionality; the rest is in LSHost.
+     */
+    function loadModuleFromGlobalCache(moduleName: string, projectName: string | undefined, compilerOptions: CompilerOptions, host: ModuleResolutionHost, globalCache: string): ResolvedModuleWithFailedLookupLocations;
+}
+//# sourceMappingURL=parser.d.ts.map
+declare namespace ts {
+    enum ModuleInstanceState {
+        NonInstantiated = 0,
+        Instantiated = 1,
+        ConstEnumOnly = 2
+    }
+    function getModuleInstanceState(node: ModuleDeclaration): ModuleInstanceState;
+    function bindSourceFile(file: SourceFile, options: CompilerOptions): void;
+    function isExportsOrModuleExportsOrAlias(sourceFile: SourceFile, node: Expression): boolean;
+    /**
+     * Computes the transform flags for a node, given the transform flags of its subtree
+     *
+     * @param node The node to analyze
+     * @param subtreeFlags Transform flags computed for this node's subtree
+     */
+    function computeTransformFlagsForNode(node: Node, subtreeFlags: TransformFlags): TransformFlags;
+    /**
+     * Gets the transform flags to exclude when unioning the transform flags of a subtree.
+     *
+     * NOTE: This needs to be kept up-to-date with the exclusions used in `computeTransformFlagsForNode`.
+     *       For performance reasons, `computeTransformFlagsForNode` uses local constant values rather
+     *       than calling this function.
+     */
+    function getTransformFlagsSubtreeExclusions(kind: SyntaxKind): TransformFlags.OuterExpressionExcludes | TransformFlags.PropertyAccessExcludes | TransformFlags.NodeExcludes | TransformFlags.ArrowFunctionExcludes | TransformFlags.FunctionExcludes | TransformFlags.ConstructorExcludes | TransformFlags.ClassExcludes | TransformFlags.ModuleExcludes | TransformFlags.TypeExcludes | TransformFlags.ObjectLiteralExcludes | TransformFlags.ArrayLiteralOrCallOrNewExcludes | TransformFlags.VariableDeclarationListExcludes | TransformFlags.CatchClauseExcludes;
+}
+/** @internal */
+declare namespace ts {
+    function createGetSymbolWalker(getRestTypeOfSignature: (sig: Signature) => Type, getTypePredicateOfSignature: (sig: Signature) => TypePredicate | undefined, getReturnTypeOfSignature: (sig: Signature) => Type, getBaseTypes: (type: Type) => Type[], resolveStructuredTypeMembers: (type: ObjectType) => ResolvedType, getTypeOfSymbol: (sym: Symbol) => Type, getResolvedSymbol: (node: Node) => Symbol, getIndexTypeOfStructuredType: (type: Type, kind: IndexKind) => Type | undefined, getConstraintFromTypeParameter: (typeParameter: TypeParameter) => Type | undefined, getFirstIdentifier: (node: EntityNameOrEntityNameExpression) => Identifier): (accept?: (symbol: Symbol) => boolean) => SymbolWalker;
+}
+declare namespace ts {
+    function getNodeId(node: Node): number;
+    function getSymbolId(symbol: Symbol): number;
+    function isInstantiatedModule(node: ModuleDeclaration, preserveConstEnums: boolean): boolean;
+    function createTypeChecker(host: TypeCheckerHost, produceDiagnostics: boolean): TypeChecker;
+}
+declare namespace ts {
+    function updateNode<T extends Node>(updated: T, original: T): T;
+    function createNodeArray<T extends Node>(elements?: T[], hasTrailingComma?: boolean): MutableNodeArray<T>;
+    function createNodeArray<T extends Node>(elements?: ReadonlyArray<T>, hasTrailingComma?: boolean): NodeArray<T>;
+    /**
+     * Creates a shallow, memberwise clone of a node with no source map location.
+     */
+    function getSynthesizedClone<T extends Node>(node: T): T;
+    function createLiteral(value: string | StringLiteral | NoSubstitutionTemplateLiteral | NumericLiteral | Identifier, isSingleQuote: boolean): StringLiteral;
+    /** If a node is passed, creates a string literal whose source text is read from a source node during emit. */
+    function createLiteral(value: string | StringLiteral | NoSubstitutionTemplateLiteral | NumericLiteral | Identifier): StringLiteral;
+    function createLiteral(value: number): NumericLiteral;
+    function createLiteral(value: boolean): BooleanLiteral;
+    function createLiteral(value: string | number | boolean): PrimaryExpression;
+    function createNumericLiteral(value: string): NumericLiteral;
+    function createStringLiteral(text: string): StringLiteral;
+    function createRegularExpressionLiteral(text: string): RegularExpressionLiteral;
+    function createIdentifier(text: string): Identifier;
+    function createIdentifier(text: string, typeArguments: ReadonlyArray<TypeNode | TypeParameterDeclaration> | undefined): Identifier;
+    function updateIdentifier(node: Identifier): Identifier;
+    function updateIdentifier(node: Identifier, typeArguments: NodeArray<TypeNode | TypeParameterDeclaration> | undefined): Identifier;
+    /** Create a unique temporary variable. */
+    function createTempVariable(recordTempVariable: ((node: Identifier) => void) | undefined): Identifier;
+    function createTempVariable(recordTempVariable: ((node: Identifier) => void) | undefined, reservedInNestedScopes: boolean): GeneratedIdentifier;
+    /** Create a unique temporary variable for use in a loop. */
+    function createLoopVariable(): Identifier;
+    /** Create a unique name based on the supplied text. */
+    function createUniqueName(text: string): Identifier;
+    function createOptimisticUniqueName(text: string): GeneratedIdentifier;
+    /** Create a unique name based on the supplied text. */
+    function createOptimisticUniqueName(text: string): Identifier;
+    /** Create a unique name based on the supplied text. This does not consider names injected by the transformer. */
+    function createFileLevelUniqueName(text: string): Identifier;
+    /** Create a unique name generated for a node. */
+    function getGeneratedNameForNode(node: Node): Identifier;
+    function getGeneratedNameForNode(node: Node, flags: GeneratedIdentifierFlags): Identifier;
+    function createToken<TKind extends SyntaxKind>(token: TKind): Token<TKind>;
+    function createSuper(): SuperExpression;
+    function createThis(): ThisExpression & Token<SyntaxKind.ThisKeyword>;
+    function createNull(): NullLiteral & Token<SyntaxKind.NullKeyword>;
+    function createTrue(): BooleanLiteral & Token<SyntaxKind.TrueKeyword>;
+    function createFalse(): BooleanLiteral & Token<SyntaxKind.FalseKeyword>;
+    function createModifier<T extends Modifier["kind"]>(kind: T): Token<T>;
+    function createModifiersFromModifierFlags(flags: ModifierFlags): Modifier[];
+    function createQualifiedName(left: EntityName, right: string | Identifier): QualifiedName;
+    function updateQualifiedName(node: QualifiedName, left: EntityName, right: Identifier): QualifiedName;
+    function createComputedPropertyName(expression: Expression): ComputedPropertyName;
+    function updateComputedPropertyName(node: ComputedPropertyName, expression: Expression): ComputedPropertyName;
+    function createTypeParameterDeclaration(name: string | Identifier, constraint?: TypeNode, defaultType?: TypeNode): TypeParameterDeclaration;
+    function updateTypeParameterDeclaration(node: TypeParameterDeclaration, name: Identifier, constraint: TypeNode | undefined, defaultType: TypeNode | undefined): TypeParameterDeclaration;
+    function createParameter(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, dotDotDotToken: DotDotDotToken | undefined, name: string | BindingName, questionToken?: QuestionToken, type?: TypeNode, initializer?: Expression): ParameterDeclaration;
+    function updateParameter(node: ParameterDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, dotDotDotToken: DotDotDotToken | undefined, name: string | BindingName, questionToken: QuestionToken | undefined, type: TypeNode | undefined, initializer: Expression | undefined): ParameterDeclaration;
+    function createDecorator(expression: Expression): Decorator;
+    function updateDecorator(node: Decorator, expression: Expression): Decorator;
+    function createPropertySignature(modifiers: ReadonlyArray<Modifier> | undefined, name: PropertyName | string, questionToken: QuestionToken | undefined, type: TypeNode | undefined, initializer: Expression | undefined): PropertySignature;
+    function updatePropertySignature(node: PropertySignature, modifiers: ReadonlyArray<Modifier> | undefined, name: PropertyName, questionToken: QuestionToken | undefined, type: TypeNode | undefined, initializer: Expression | undefined): PropertySignature;
+    function createProperty(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | PropertyName, questionOrExclamationToken: QuestionToken | ExclamationToken | undefined, type: TypeNode | undefined, initializer: Expression | undefined): PropertyDeclaration;
+    function updateProperty(node: PropertyDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | PropertyName, questionOrExclamationToken: QuestionToken | ExclamationToken | undefined, type: TypeNode | undefined, initializer: Expression | undefined): PropertyDeclaration;
+    function createMethodSignature(typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, name: string | PropertyName, questionToken: QuestionToken | undefined): MethodSignature;
+    function updateMethodSignature(node: MethodSignature, typeParameters: NodeArray<TypeParameterDeclaration> | undefined, parameters: NodeArray<ParameterDeclaration>, type: TypeNode | undefined, name: PropertyName, questionToken: QuestionToken | undefined): MethodSignature;
+    function createMethod(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, asteriskToken: AsteriskToken | undefined, name: string | PropertyName, questionToken: QuestionToken | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, body: Block | undefined): MethodDeclaration;
+    function updateMethod(node: MethodDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, asteriskToken: AsteriskToken | undefined, name: PropertyName, questionToken: QuestionToken | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, body: Block | undefined): MethodDeclaration;
+    function createConstructor(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, body: Block | undefined): ConstructorDeclaration;
+    function updateConstructor(node: ConstructorDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, body: Block | undefined): ConstructorDeclaration;
+    function createGetAccessor(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | PropertyName, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, body: Block | undefined): GetAccessorDeclaration;
+    function updateGetAccessor(node: GetAccessorDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: PropertyName, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, body: Block | undefined): GetAccessorDeclaration;
+    function createSetAccessor(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | PropertyName, parameters: ReadonlyArray<ParameterDeclaration>, body: Block | undefined): SetAccessorDeclaration;
+    function updateSetAccessor(node: SetAccessorDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: PropertyName, parameters: ReadonlyArray<ParameterDeclaration>, body: Block | undefined): SetAccessorDeclaration;
+    function createCallSignature(typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined): CallSignatureDeclaration;
+    function updateCallSignature(node: CallSignatureDeclaration, typeParameters: NodeArray<TypeParameterDeclaration> | undefined, parameters: NodeArray<ParameterDeclaration>, type: TypeNode | undefined): CallSignatureDeclaration;
+    function createConstructSignature(typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined): ConstructSignatureDeclaration;
+    function updateConstructSignature(node: ConstructSignatureDeclaration, typeParameters: NodeArray<TypeParameterDeclaration> | undefined, parameters: NodeArray<ParameterDeclaration>, type: TypeNode | undefined): ConstructSignatureDeclaration;
+    function createIndexSignature(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode): IndexSignatureDeclaration;
+    function updateIndexSignature(node: IndexSignatureDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode): IndexSignatureDeclaration;
+    function createSignatureDeclaration(kind: SyntaxKind, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, typeArguments?: ReadonlyArray<TypeNode> | undefined): SignatureDeclaration;
+    function createKeywordTypeNode(kind: KeywordTypeNode["kind"]): KeywordTypeNode;
+    function createTypePredicateNode(parameterName: Identifier | ThisTypeNode | string, type: TypeNode): TypePredicateNode;
+    function updateTypePredicateNode(node: TypePredicateNode, parameterName: Identifier | ThisTypeNode, type: TypeNode): TypePredicateNode;
+    function createTypeReferenceNode(typeName: string | EntityName, typeArguments: ReadonlyArray<TypeNode> | undefined): TypeReferenceNode;
+    function updateTypeReferenceNode(node: TypeReferenceNode, typeName: EntityName, typeArguments: NodeArray<TypeNode> | undefined): TypeReferenceNode;
+    function createFunctionTypeNode(typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined): FunctionTypeNode;
+    function updateFunctionTypeNode(node: FunctionTypeNode, typeParameters: NodeArray<TypeParameterDeclaration> | undefined, parameters: NodeArray<ParameterDeclaration>, type: TypeNode | undefined): FunctionTypeNode;
+    function createConstructorTypeNode(typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined): ConstructorTypeNode;
+    function updateConstructorTypeNode(node: ConstructorTypeNode, typeParameters: NodeArray<TypeParameterDeclaration> | undefined, parameters: NodeArray<ParameterDeclaration>, type: TypeNode | undefined): ConstructorTypeNode;
+    function createTypeQueryNode(exprName: EntityName): TypeQueryNode;
+    function updateTypeQueryNode(node: TypeQueryNode, exprName: EntityName): TypeQueryNode;
+    function createTypeLiteralNode(members: ReadonlyArray<TypeElement> | undefined): TypeLiteralNode;
+    function updateTypeLiteralNode(node: TypeLiteralNode, members: NodeArray<TypeElement>): TypeLiteralNode;
+    function createArrayTypeNode(elementType: TypeNode): ArrayTypeNode;
+    function updateArrayTypeNode(node: ArrayTypeNode, elementType: TypeNode): ArrayTypeNode;
+    function createTupleTypeNode(elementTypes: ReadonlyArray<TypeNode>): TupleTypeNode;
+    function updateTypleTypeNode(node: TupleTypeNode, elementTypes: ReadonlyArray<TypeNode>): TupleTypeNode;
+    function createUnionTypeNode(types: ReadonlyArray<TypeNode>): UnionTypeNode;
+    function updateUnionTypeNode(node: UnionTypeNode, types: NodeArray<TypeNode>): UnionTypeNode;
+    function createIntersectionTypeNode(types: ReadonlyArray<TypeNode>): IntersectionTypeNode;
+    function updateIntersectionTypeNode(node: IntersectionTypeNode, types: NodeArray<TypeNode>): IntersectionTypeNode;
+    function createUnionOrIntersectionTypeNode(kind: SyntaxKind.UnionType | SyntaxKind.IntersectionType, types: ReadonlyArray<TypeNode>): UnionTypeNode | IntersectionTypeNode;
+    function createConditionalTypeNode(checkType: TypeNode, extendsType: TypeNode, trueType: TypeNode, falseType: TypeNode): ConditionalTypeNode;
+    function updateConditionalTypeNode(node: ConditionalTypeNode, checkType: TypeNode, extendsType: TypeNode, trueType: TypeNode, falseType: TypeNode): ConditionalTypeNode;
+    function createInferTypeNode(typeParameter: TypeParameterDeclaration): InferTypeNode;
+    function updateInferTypeNode(node: InferTypeNode, typeParameter: TypeParameterDeclaration): InferTypeNode;
+    function createImportTypeNode(argument: TypeNode, qualifier?: EntityName, typeArguments?: ReadonlyArray<TypeNode>, isTypeOf?: boolean): ImportTypeNode;
+    function updateImportTypeNode(node: ImportTypeNode, argument: TypeNode, qualifier?: EntityName, typeArguments?: ReadonlyArray<TypeNode>, isTypeOf?: boolean): ImportTypeNode;
+    function createParenthesizedType(type: TypeNode): ParenthesizedTypeNode;
+    function updateParenthesizedType(node: ParenthesizedTypeNode, type: TypeNode): ParenthesizedTypeNode;
+    function createThisTypeNode(): ThisTypeNode;
+    function createTypeOperatorNode(type: TypeNode): TypeOperatorNode;
+    function createTypeOperatorNode(operator: SyntaxKind.KeyOfKeyword | SyntaxKind.UniqueKeyword, type: TypeNode): TypeOperatorNode;
+    function updateTypeOperatorNode(node: TypeOperatorNode, type: TypeNode): TypeOperatorNode;
+    function createIndexedAccessTypeNode(objectType: TypeNode, indexType: TypeNode): IndexedAccessTypeNode;
+    function updateIndexedAccessTypeNode(node: IndexedAccessTypeNode, objectType: TypeNode, indexType: TypeNode): IndexedAccessTypeNode;
+    function createMappedTypeNode(readonlyToken: ReadonlyToken | PlusToken | MinusToken | undefined, typeParameter: TypeParameterDeclaration, questionToken: QuestionToken | PlusToken | MinusToken | undefined, type: TypeNode | undefined): MappedTypeNode;
+    function updateMappedTypeNode(node: MappedTypeNode, readonlyToken: ReadonlyToken | PlusToken | MinusToken | undefined, typeParameter: TypeParameterDeclaration, questionToken: QuestionToken | PlusToken | MinusToken | undefined, type: TypeNode | undefined): MappedTypeNode;
+    function createLiteralTypeNode(literal: LiteralTypeNode["literal"]): LiteralTypeNode;
+    function updateLiteralTypeNode(node: LiteralTypeNode, literal: LiteralTypeNode["literal"]): LiteralTypeNode;
+    function createObjectBindingPattern(elements: ReadonlyArray<BindingElement>): ObjectBindingPattern;
+    function updateObjectBindingPattern(node: ObjectBindingPattern, elements: ReadonlyArray<BindingElement>): ObjectBindingPattern;
+    function createArrayBindingPattern(elements: ReadonlyArray<ArrayBindingElement>): ArrayBindingPattern;
+    function updateArrayBindingPattern(node: ArrayBindingPattern, elements: ReadonlyArray<ArrayBindingElement>): ArrayBindingPattern;
+    function createBindingElement(dotDotDotToken: DotDotDotToken | undefined, propertyName: string | PropertyName | undefined, name: string | BindingName, initializer?: Expression): BindingElement;
+    function updateBindingElement(node: BindingElement, dotDotDotToken: DotDotDotToken | undefined, propertyName: PropertyName | undefined, name: BindingName, initializer: Expression | undefined): BindingElement;
+    function createArrayLiteral(elements?: ReadonlyArray<Expression>, multiLine?: boolean): ArrayLiteralExpression;
+    function updateArrayLiteral(node: ArrayLiteralExpression, elements: ReadonlyArray<Expression>): ArrayLiteralExpression;
+    function createObjectLiteral(properties?: ReadonlyArray<ObjectLiteralElementLike>, multiLine?: boolean): ObjectLiteralExpression;
+    function updateObjectLiteral(node: ObjectLiteralExpression, properties: ReadonlyArray<ObjectLiteralElementLike>): ObjectLiteralExpression;
+    function createPropertyAccess(expression: Expression, name: string | Identifier | undefined): PropertyAccessExpression;
+    function updatePropertyAccess(node: PropertyAccessExpression, expression: Expression, name: Identifier): PropertyAccessExpression;
+    function createElementAccess(expression: Expression, index: number | Expression): ElementAccessExpression;
+    function updateElementAccess(node: ElementAccessExpression, expression: Expression, argumentExpression: Expression): ElementAccessExpression;
+    function createCall(expression: Expression, typeArguments: ReadonlyArray<TypeNode> | undefined, argumentsArray: ReadonlyArray<Expression> | undefined): CallExpression;
+    function updateCall(node: CallExpression, expression: Expression, typeArguments: ReadonlyArray<TypeNode> | undefined, argumentsArray: ReadonlyArray<Expression>): CallExpression;
+    function createNew(expression: Expression, typeArguments: ReadonlyArray<TypeNode> | undefined, argumentsArray: ReadonlyArray<Expression> | undefined): NewExpression;
+    function updateNew(node: NewExpression, expression: Expression, typeArguments: ReadonlyArray<TypeNode> | undefined, argumentsArray: ReadonlyArray<Expression> | undefined): NewExpression;
+    function createTaggedTemplate(tag: Expression, template: TemplateLiteral): TaggedTemplateExpression;
+    function createTaggedTemplate(tag: Expression, typeArguments: ReadonlyArray<TypeNode> | undefined, template: TemplateLiteral): TaggedTemplateExpression;
+    /** @internal */
+    function createTaggedTemplate(tag: Expression, typeArgumentsOrTemplate: ReadonlyArray<TypeNode> | TemplateLiteral | undefined, template?: TemplateLiteral): TaggedTemplateExpression;
+    function updateTaggedTemplate(node: TaggedTemplateExpression, tag: Expression, template: TemplateLiteral): TaggedTemplateExpression;
+    function updateTaggedTemplate(node: TaggedTemplateExpression, tag: Expression, typeArguments: ReadonlyArray<TypeNode> | undefined, template: TemplateLiteral): TaggedTemplateExpression;
+    function createTypeAssertion(type: TypeNode, expression: Expression): TypeAssertion;
+    function updateTypeAssertion(node: TypeAssertion, type: TypeNode, expression: Expression): TypeAssertion;
+    function createParen(expression: Expression): ParenthesizedExpression;
+    function updateParen(node: ParenthesizedExpression, expression: Expression): ParenthesizedExpression;
+    function createFunctionExpression(modifiers: ReadonlyArray<Modifier> | undefined, asteriskToken: AsteriskToken | undefined, name: string | Identifier | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration> | undefined, type: TypeNode | undefined, body: Block): FunctionExpression;
+    function updateFunctionExpression(node: FunctionExpression, modifiers: ReadonlyArray<Modifier> | undefined, asteriskToken: AsteriskToken | undefined, name: Identifier | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, body: Block): FunctionExpression;
+    function createArrowFunction(modifiers: ReadonlyArray<Modifier> | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, equalsGreaterThanToken: EqualsGreaterThanToken | undefined, body: ConciseBody): ArrowFunction;
+    function updateArrowFunction(node: ArrowFunction, modifiers: ReadonlyArray<Modifier> | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, body: ConciseBody): ArrowFunction;
+    function updateArrowFunction(node: ArrowFunction, modifiers: ReadonlyArray<Modifier> | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, equalsGreaterThanToken: Token<SyntaxKind.EqualsGreaterThanToken>, body: ConciseBody): ArrowFunction;
+    function createDelete(expression: Expression): DeleteExpression;
+    function updateDelete(node: DeleteExpression, expression: Expression): DeleteExpression;
+    function createTypeOf(expression: Expression): TypeOfExpression;
+    function updateTypeOf(node: TypeOfExpression, expression: Expression): TypeOfExpression;
+    function createVoid(expression: Expression): VoidExpression;
+    function updateVoid(node: VoidExpression, expression: Expression): VoidExpression;
+    function createAwait(expression: Expression): AwaitExpression;
+    function updateAwait(node: AwaitExpression, expression: Expression): AwaitExpression;
+    function createPrefix(operator: PrefixUnaryOperator, operand: Expression): PrefixUnaryExpression;
+    function updatePrefix(node: PrefixUnaryExpression, operand: Expression): PrefixUnaryExpression;
+    function createPostfix(operand: Expression, operator: PostfixUnaryOperator): PostfixUnaryExpression;
+    function updatePostfix(node: PostfixUnaryExpression, operand: Expression): PostfixUnaryExpression;
+    function createBinary(left: Expression, operator: BinaryOperator | BinaryOperatorToken, right: Expression): BinaryExpression;
+    function updateBinary(node: BinaryExpression, left: Expression, right: Expression, operator?: BinaryOperator | BinaryOperatorToken): BinaryExpression;
+    function createConditional(condition: Expression, whenTrue: Expression, whenFalse: Expression): ConditionalExpression;
+    function createConditional(condition: Expression, questionToken: QuestionToken, whenTrue: Expression, colonToken: ColonToken, whenFalse: Expression): ConditionalExpression;
+    function updateConditional(node: ConditionalExpression, condition: Expression, whenTrue: Expression, whenFalse: Expression): ConditionalExpression;
+    function updateConditional(node: ConditionalExpression, condition: Expression, questionToken: Token<SyntaxKind.QuestionToken>, whenTrue: Expression, colonToken: Token<SyntaxKind.ColonToken>, whenFalse: Expression): ConditionalExpression;
+    function createTemplateExpression(head: TemplateHead, templateSpans: ReadonlyArray<TemplateSpan>): TemplateExpression;
+    function updateTemplateExpression(node: TemplateExpression, head: TemplateHead, templateSpans: ReadonlyArray<TemplateSpan>): TemplateExpression;
+    function createTemplateHead(text: string): TemplateHead;
+    function createTemplateMiddle(text: string): TemplateMiddle;
+    function createTemplateTail(text: string): TemplateTail;
+    function createNoSubstitutionTemplateLiteral(text: string): NoSubstitutionTemplateLiteral;
+    function createYield(expression?: Expression): YieldExpression;
+    function createYield(asteriskToken: AsteriskToken | undefined, expression: Expression): YieldExpression;
+    function updateYield(node: YieldExpression, asteriskToken: AsteriskToken | undefined, expression: Expression): YieldExpression;
+    function createSpread(expression: Expression): SpreadElement;
+    function updateSpread(node: SpreadElement, expression: Expression): SpreadElement;
+    function createClassExpression(modifiers: ReadonlyArray<Modifier> | undefined, name: string | Identifier | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, heritageClauses: ReadonlyArray<HeritageClause> | undefined, members: ReadonlyArray<ClassElement>): ClassExpression;
+    function updateClassExpression(node: ClassExpression, modifiers: ReadonlyArray<Modifier> | undefined, name: Identifier | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, heritageClauses: ReadonlyArray<HeritageClause> | undefined, members: ReadonlyArray<ClassElement>): ClassExpression;
+    function createOmittedExpression(): OmittedExpression;
+    function createExpressionWithTypeArguments(typeArguments: ReadonlyArray<TypeNode> | undefined, expression: Expression): ExpressionWithTypeArguments;
+    function updateExpressionWithTypeArguments(node: ExpressionWithTypeArguments, typeArguments: ReadonlyArray<TypeNode> | undefined, expression: Expression): ExpressionWithTypeArguments;
+    function createAsExpression(expression: Expression, type: TypeNode): AsExpression;
+    function updateAsExpression(node: AsExpression, expression: Expression, type: TypeNode): AsExpression;
+    function createNonNullExpression(expression: Expression): NonNullExpression;
+    function updateNonNullExpression(node: NonNullExpression, expression: Expression): NonNullExpression;
+    function createMetaProperty(keywordToken: MetaProperty["keywordToken"], name: Identifier): MetaProperty;
+    function updateMetaProperty(node: MetaProperty, name: Identifier): MetaProperty;
+    function createTemplateSpan(expression: Expression, literal: TemplateMiddle | TemplateTail): TemplateSpan;
+    function updateTemplateSpan(node: TemplateSpan, expression: Expression, literal: TemplateMiddle | TemplateTail): TemplateSpan;
+    function createSemicolonClassElement(): SemicolonClassElement;
+    function createBlock(statements: ReadonlyArray<Statement>, multiLine?: boolean): Block;
+    function createExpressionStatement(expression: Expression): ExpressionStatement;
+    function updateBlock(node: Block, statements: ReadonlyArray<Statement>): Block;
+    function createVariableStatement(modifiers: ReadonlyArray<Modifier> | undefined, declarationList: VariableDeclarationList | ReadonlyArray<VariableDeclaration>): VariableStatement;
+    function updateVariableStatement(node: VariableStatement, modifiers: ReadonlyArray<Modifier> | undefined, declarationList: VariableDeclarationList): VariableStatement;
+    function createEmptyStatement(): EmptyStatement;
+    function createStatement(expression: Expression): ExpressionStatement;
+    function updateStatement(node: ExpressionStatement, expression: Expression): ExpressionStatement;
+    function createIf(expression: Expression, thenStatement: Statement, elseStatement?: Statement): IfStatement;
+    function updateIf(node: IfStatement, expression: Expression, thenStatement: Statement, elseStatement: Statement | undefined): IfStatement;
+    function createDo(statement: Statement, expression: Expression): DoStatement;
+    function updateDo(node: DoStatement, statement: Statement, expression: Expression): DoStatement;
+    function createWhile(expression: Expression, statement: Statement): WhileStatement;
+    function updateWhile(node: WhileStatement, expression: Expression, statement: Statement): WhileStatement;
+    function createFor(initializer: ForInitializer | undefined, condition: Expression | undefined, incrementor: Expression | undefined, statement: Statement): ForStatement;
+    function updateFor(node: ForStatement, initializer: ForInitializer | undefined, condition: Expression | undefined, incrementor: Expression | undefined, statement: Statement): ForStatement;
+    function createForIn(initializer: ForInitializer, expression: Expression, statement: Statement): ForInStatement;
+    function updateForIn(node: ForInStatement, initializer: ForInitializer, expression: Expression, statement: Statement): ForInStatement;
+    function createForOf(awaitModifier: AwaitKeywordToken | undefined, initializer: ForInitializer, expression: Expression, statement: Statement): ForOfStatement;
+    function updateForOf(node: ForOfStatement, awaitModifier: AwaitKeywordToken | undefined, initializer: ForInitializer, expression: Expression, statement: Statement): ForOfStatement;
+    function createContinue(label?: string | Identifier): ContinueStatement;
+    function updateContinue(node: ContinueStatement, label: Identifier | undefined): ContinueStatement;
+    function createBreak(label?: string | Identifier): BreakStatement;
+    function updateBreak(node: BreakStatement, label: Identifier | undefined): BreakStatement;
+    function createReturn(expression?: Expression): ReturnStatement;
+    function updateReturn(node: ReturnStatement, expression: Expression | undefined): ReturnStatement;
+    function createWith(expression: Expression, statement: Statement): WithStatement;
+    function updateWith(node: WithStatement, expression: Expression, statement: Statement): WithStatement;
+    function createSwitch(expression: Expression, caseBlock: CaseBlock): SwitchStatement;
+    function updateSwitch(node: SwitchStatement, expression: Expression, caseBlock: CaseBlock): SwitchStatement;
+    function createLabel(label: string | Identifier, statement: Statement): LabeledStatement;
+    function updateLabel(node: LabeledStatement, label: Identifier, statement: Statement): LabeledStatement;
+    function createThrow(expression: Expression): ThrowStatement;
+    function updateThrow(node: ThrowStatement, expression: Expression): ThrowStatement;
+    function createTry(tryBlock: Block, catchClause: CatchClause | undefined, finallyBlock: Block | undefined): TryStatement;
+    function updateTry(node: TryStatement, tryBlock: Block, catchClause: CatchClause | undefined, finallyBlock: Block | undefined): TryStatement;
+    function createDebuggerStatement(): DebuggerStatement;
+    function createVariableDeclaration(name: string | BindingName, type?: TypeNode, initializer?: Expression): VariableDeclaration;
+    function updateVariableDeclaration(node: VariableDeclaration, name: BindingName, type: TypeNode | undefined, initializer: Expression | undefined): VariableDeclaration;
+    function createVariableDeclarationList(declarations: ReadonlyArray<VariableDeclaration>, flags?: NodeFlags): VariableDeclarationList;
+    function updateVariableDeclarationList(node: VariableDeclarationList, declarations: ReadonlyArray<VariableDeclaration>): VariableDeclarationList;
+    function createFunctionDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, asteriskToken: AsteriskToken | undefined, name: string | Identifier | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, body: Block | undefined): FunctionDeclaration;
+    function updateFunctionDeclaration(node: FunctionDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, asteriskToken: AsteriskToken | undefined, name: Identifier | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, parameters: ReadonlyArray<ParameterDeclaration>, type: TypeNode | undefined, body: Block | undefined): FunctionDeclaration;
+    function createClassDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | Identifier | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, heritageClauses: ReadonlyArray<HeritageClause> | undefined, members: ReadonlyArray<ClassElement>): ClassDeclaration;
+    function updateClassDeclaration(node: ClassDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: Identifier | undefined, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, heritageClauses: ReadonlyArray<HeritageClause> | undefined, members: ReadonlyArray<ClassElement>): ClassDeclaration;
+    function createInterfaceDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | Identifier, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, heritageClauses: ReadonlyArray<HeritageClause> | undefined, members: ReadonlyArray<TypeElement>): InterfaceDeclaration;
+    function updateInterfaceDeclaration(node: InterfaceDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: Identifier, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, heritageClauses: ReadonlyArray<HeritageClause> | undefined, members: ReadonlyArray<TypeElement>): InterfaceDeclaration;
+    function createTypeAliasDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | Identifier, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, type: TypeNode): TypeAliasDeclaration;
+    function updateTypeAliasDeclaration(node: TypeAliasDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: Identifier, typeParameters: ReadonlyArray<TypeParameterDeclaration> | undefined, type: TypeNode): TypeAliasDeclaration;
+    function createEnumDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | Identifier, members: ReadonlyArray<EnumMember>): EnumDeclaration;
+    function updateEnumDeclaration(node: EnumDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: Identifier, members: ReadonlyArray<EnumMember>): EnumDeclaration;
+    function createModuleDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: ModuleName, body: ModuleBody | undefined, flags?: NodeFlags): ModuleDeclaration;
+    function updateModuleDeclaration(node: ModuleDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: ModuleName, body: ModuleBody | undefined): ModuleDeclaration;
+    function createModuleBlock(statements: ReadonlyArray<Statement>): ModuleBlock;
+    function updateModuleBlock(node: ModuleBlock, statements: ReadonlyArray<Statement>): ModuleBlock;
+    function createCaseBlock(clauses: ReadonlyArray<CaseOrDefaultClause>): CaseBlock;
+    function updateCaseBlock(node: CaseBlock, clauses: ReadonlyArray<CaseOrDefaultClause>): CaseBlock;
+    function createNamespaceExportDeclaration(name: string | Identifier): NamespaceExportDeclaration;
+    function updateNamespaceExportDeclaration(node: NamespaceExportDeclaration, name: Identifier): NamespaceExportDeclaration;
+    function createImportEqualsDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: string | Identifier, moduleReference: ModuleReference): ImportEqualsDeclaration;
+    function updateImportEqualsDeclaration(node: ImportEqualsDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, name: Identifier, moduleReference: ModuleReference): ImportEqualsDeclaration;
+    function createImportDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, importClause: ImportClause | undefined, moduleSpecifier: Expression): ImportDeclaration;
+    function updateImportDeclaration(node: ImportDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, importClause: ImportClause | undefined, moduleSpecifier: Expression): ImportDeclaration;
+    function createImportClause(name: Identifier | undefined, namedBindings: NamedImportBindings | undefined): ImportClause;
+    function updateImportClause(node: ImportClause, name: Identifier | undefined, namedBindings: NamedImportBindings | undefined): ImportClause;
+    function createNamespaceImport(name: Identifier): NamespaceImport;
+    function updateNamespaceImport(node: NamespaceImport, name: Identifier): NamespaceImport;
+    function createNamedImports(elements: ReadonlyArray<ImportSpecifier>): NamedImports;
+    function updateNamedImports(node: NamedImports, elements: ReadonlyArray<ImportSpecifier>): NamedImports;
+    function createImportSpecifier(propertyName: Identifier | undefined, name: Identifier): ImportSpecifier;
+    function updateImportSpecifier(node: ImportSpecifier, propertyName: Identifier | undefined, name: Identifier): ImportSpecifier;
+    function createExportAssignment(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, isExportEquals: boolean | undefined, expression: Expression): ExportAssignment;
+    function updateExportAssignment(node: ExportAssignment, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, expression: Expression): ExportAssignment;
+    function createExportDeclaration(decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, exportClause: NamedExports | undefined, moduleSpecifier?: Expression): ExportDeclaration;
+    function updateExportDeclaration(node: ExportDeclaration, decorators: ReadonlyArray<Decorator> | undefined, modifiers: ReadonlyArray<Modifier> | undefined, exportClause: NamedExports | undefined, moduleSpecifier: Expression | undefined): ExportDeclaration;
+    function createNamedExports(elements: ReadonlyArray<ExportSpecifier>): NamedExports;
+    function updateNamedExports(node: NamedExports, elements: ReadonlyArray<ExportSpecifier>): NamedExports;
+    function createExportSpecifier(propertyName: string | Identifier | undefined, name: string | Identifier): ExportSpecifier;
+    function updateExportSpecifier(node: ExportSpecifier, propertyName: Identifier | undefined, name: Identifier): ExportSpecifier;
+    function createExternalModuleReference(expression: Expression): ExternalModuleReference;
+    function updateExternalModuleReference(node: ExternalModuleReference, expression: Expression): ExternalModuleReference;
+    function createJsxElement(openingElement: JsxOpeningElement, children: ReadonlyArray<JsxChild>, closingElement: JsxClosingElement): JsxElement;
+    function updateJsxElement(node: JsxElement, openingElement: JsxOpeningElement, children: ReadonlyArray<JsxChild>, closingElement: JsxClosingElement): JsxElement;
+    function createJsxSelfClosingElement(tagName: JsxTagNameExpression, typeArguments: ReadonlyArray<TypeNode> | undefined, attributes: JsxAttributes): JsxSelfClosingElement;
+    function updateJsxSelfClosingElement(node: JsxSelfClosingElement, tagName: JsxTagNameExpression, typeArguments: ReadonlyArray<TypeNode> | undefined, attributes: JsxAttributes): JsxSelfClosingElement;
+    function createJsxOpeningElement(tagName: JsxTagNameExpression, typeArguments: ReadonlyArray<TypeNode> | undefined, attributes: JsxAttributes): JsxOpeningElement;
+    function updateJsxOpeningElement(node: JsxOpeningElement, tagName: JsxTagNameExpression, typeArguments: ReadonlyArray<TypeNode> | undefined, attributes: JsxAttributes): JsxOpeningElement;
+    function createJsxClosingElement(tagName: JsxTagNameExpression): JsxClosingElement;
+    function updateJsxClosingElement(node: JsxClosingElement, tagName: JsxTagNameExpression): JsxClosingElement;
+    function createJsxFragment(openingFragment: JsxOpeningFragment, children: ReadonlyArray<JsxChild>, closingFragment: JsxClosingFragment): JsxFragment;
+    function updateJsxFragment(node: JsxFragment, openingFragment: JsxOpeningFragment, children: ReadonlyArray<JsxChild>, closingFragment: JsxClosingFragment): JsxFragment;
+    function createJsxAttribute(name: Identifier, initializer: StringLiteral | JsxExpression): JsxAttribute;
+    function updateJsxAttribute(node: JsxAttribute, name: Identifier, initializer: StringLiteral | JsxExpression): JsxAttribute;
+    function createJsxAttributes(properties: ReadonlyArray<JsxAttributeLike>): JsxAttributes;
+    function updateJsxAttributes(node: JsxAttributes, properties: ReadonlyArray<JsxAttributeLike>): JsxAttributes;
+    function createJsxSpreadAttribute(expression: Expression): JsxSpreadAttribute;
+    function updateJsxSpreadAttribute(node: JsxSpreadAttribute, expression: Expression): JsxSpreadAttribute;
+    function createJsxExpression(dotDotDotToken: DotDotDotToken | undefined, expression: Expression | undefined): JsxExpression;
+    function updateJsxExpression(node: JsxExpression, expression: Expression | undefined): JsxExpression;
+    function createCaseClause(expression: Expression, statements: ReadonlyArray<Statement>): CaseClause;
+    function updateCaseClause(node: CaseClause, expression: Expression, statements: ReadonlyArray<Statement>): CaseClause;
+    function createDefaultClause(statements: ReadonlyArray<Statement>): DefaultClause;
+    function updateDefaultClause(node: DefaultClause, statements: ReadonlyArray<Statement>): DefaultClause;
+    function createHeritageClause(token: HeritageClause["token"], types: ReadonlyArray<ExpressionWithTypeArguments>): HeritageClause;
+    function updateHeritageClause(node: HeritageClause, types: ReadonlyArray<ExpressionWithTypeArguments>): HeritageClause;
+    function createCatchClause(variableDeclaration: string | VariableDeclaration | undefined, block: Block): CatchClause;
+    function updateCatchClause(node: CatchClause, variableDeclaration: VariableDeclaration | undefined, block: Block): CatchClause;
+    function createPropertyAssignment(name: string | PropertyName, initializer: Expression): PropertyAssignment;
+    function updatePropertyAssignment(node: PropertyAssignment, name: PropertyName, initializer: Expression): PropertyAssignment;
+    function createShorthandPropertyAssignment(name: string | Identifier, objectAssignmentInitializer?: Expression): ShorthandPropertyAssignment;
+    function updateShorthandPropertyAssignment(node: ShorthandPropertyAssignment, name: Identifier, objectAssignmentInitializer: Expression | undefined): ShorthandPropertyAssignment;
+    function createSpreadAssignment(expression: Expression): SpreadAssignment;
+    function updateSpreadAssignment(node: SpreadAssignment, expression: Expression): SpreadAssignment;
+    function createEnumMember(name: string | PropertyName, initializer?: Expression): EnumMember;
+    function updateEnumMember(node: EnumMember, name: PropertyName, initializer: Expression | undefined): EnumMember;
+    function updateSourceFileNode(node: SourceFile, statements: ReadonlyArray<Statement>, isDeclarationFile?: boolean, referencedFiles?: SourceFile["referencedFiles"], typeReferences?: SourceFile["typeReferenceDirectives"], hasNoDefaultLib?: boolean, libReferences?: SourceFile["libReferenceDirectives"]): SourceFile;
+    /**
+     * Creates a shallow, memberwise clone of a node for mutation.
+     */
+    function getMutableClone<T extends Node>(node: T): T;
+    /**
+     * Creates a synthetic statement to act as a placeholder for a not-emitted statement in
+     * order to preserve comments.
+     *
+     * @param original The original statement.
+     */
+    function createNotEmittedStatement(original: Node): NotEmittedStatement;
+    /**
+     * Creates a synthetic element to act as a placeholder for the end of an emitted declaration in
+     * order to properly emit exports.
+     */
+    function createEndOfDeclarationMarker(original: Node): EndOfDeclarationMarker;
+    /**
+     * Creates a synthetic element to act as a placeholder for the beginning of a merged declaration in
+     * order to properly emit exports.
+     */
+    function createMergeDeclarationMarker(original: Node): MergeDeclarationMarker;
+    /**
+     * Creates a synthetic expression to act as a placeholder for a not-emitted expression in
+     * order to preserve comments or sourcemap positions.
+     *
+     * @param expression The inner expression to emit.
+     * @param original The original outer expression.
+     * @param location The location for the expression. Defaults to the positions from "original" if provided.
+     */
+    function createPartiallyEmittedExpression(expression: Expression, original?: Node): PartiallyEmittedExpression;
+    function updatePartiallyEmittedExpression(node: PartiallyEmittedExpression, expression: Expression): PartiallyEmittedExpression;
+    function createCommaList(elements: ReadonlyArray<Expression>): CommaListExpression;
+    function updateCommaList(node: CommaListExpression, elements: ReadonlyArray<Expression>): CommaListExpression;
+    function createBundle(sourceFiles: ReadonlyArray<SourceFile>, prepends?: ReadonlyArray<UnparsedSource | InputFiles>): Bundle;
+    function createUnparsedSourceFile(text: string, map?: string): UnparsedSource;
+    function createInputFiles(javascript: string, declaration: string, javascriptMapText?: string, declarationMapText?: string): InputFiles;
+    function updateBundle(node: Bundle, sourceFiles: ReadonlyArray<SourceFile>, prepends?: ReadonlyArray<UnparsedSource>): Bundle;
+    function createImmediatelyInvokedFunctionExpression(statements: ReadonlyArray<Statement>): CallExpression;
+    function createImmediatelyInvokedFunctionExpression(statements: ReadonlyArray<Statement>, param: ParameterDeclaration, paramValue: Expression): CallExpression;
+    function createImmediatelyInvokedArrowFunction(statements: ReadonlyArray<Statement>): CallExpression;
+    function createImmediatelyInvokedArrowFunction(statements: ReadonlyArray<Statement>, param: ParameterDeclaration, paramValue: Expression): CallExpression;
+    function createComma(left: Expression, right: Expression): Expression;
+    function createLessThan(left: Expression, right: Expression): Expression;
+    function createAssignment(left: ObjectLiteralExpression | ArrayLiteralExpression, right: Expression): DestructuringAssignment;
+    function createAssignment(left: Expression, right: Expression): BinaryExpression;
+    function createStrictEquality(left: Expression, right: Expression): BinaryExpression;
+    function createStrictInequality(left: Expression, right: Expression): BinaryExpression;
+    function createAdd(left: Expression, right: Expression): BinaryExpression;
+    function createSubtract(left: Expression, right: Expression): BinaryExpression;
+    function createPostfixIncrement(operand: Expression): PostfixUnaryExpression;
+    function createLogicalAnd(left: Expression, right: Expression): BinaryExpression;
+    function createLogicalOr(left: Expression, right: Expression): BinaryExpression;
+    function createLogicalNot(operand: Expression): PrefixUnaryExpression;
+    function createVoidZero(): VoidExpression;
+    function createExportDefault(expression: Expression): ExportAssignment;
+    function createExternalModuleExport(exportName: Identifier): ExportDeclaration;
+    /**
+     * Clears any EmitNode entries from parse-tree nodes.
+     * @param sourceFile A source file.
+     */
+    function disposeEmitNodes(sourceFile: SourceFile): void;
+    /**
+     * Associates a node with the current transformation, initializing
+     * various transient transformation properties.
+     */
+    function getOrCreateEmitNode(node: Node): EmitNode;
+    function setTextRange<T extends TextRange>(range: T, location: TextRange | undefined): T;
+    /**
+     * Sets flags that control emit behavior of a node.
+     */
+    function setEmitFlags<T extends Node>(node: T, emitFlags: EmitFlags): T;
+    /**
+     * Sets flags that control emit behavior of a node.
+     */
+    function addEmitFlags<T extends Node>(node: T, emitFlags: EmitFlags): T;
+    /**
+     * Gets a custom text range to use when emitting source maps.
+     */
+    function getSourceMapRange(node: Node): SourceMapRange;
+    /**
+     * Sets a custom text range to use when emitting source maps.
+     */
+    function setSourceMapRange<T extends Node>(node: T, range: SourceMapRange | undefined): T;
+    /**
+     * Create an external source map source file reference
+     */
+    function createSourceMapSource(fileName: string, text: string, skipTrivia?: (pos: number) => number): SourceMapSource;
+    /**
+     * Gets the TextRange to use for source maps for a token of a node.
+     */
+    function getTokenSourceMapRange(node: Node, token: SyntaxKind): SourceMapRange | undefined;
+    /**
+     * Sets the TextRange to use for source maps for a token of a node.
+     */
+    function setTokenSourceMapRange<T extends Node>(node: T, token: SyntaxKind, range: SourceMapRange | undefined): T;
+    /**
+     * Gets a custom text range to use when emitting comments.
+     */
+    function getStartsOnNewLine(node: Node): boolean | undefined;
+    /**
+     * Sets a custom text range to use when emitting comments.
+     */
+    function setStartsOnNewLine<T extends Node>(node: T, newLine: boolean): T;
+    /**
+     * Gets a custom text range to use when emitting comments.
+     */
+    function getCommentRange(node: Node): TextRange;
+    /**
+     * Sets a custom text range to use when emitting comments.
+     */
+    function setCommentRange<T extends Node>(node: T, range: TextRange): T;
+    function getSyntheticLeadingComments(node: Node): SynthesizedComment[] | undefined;
+    function setSyntheticLeadingComments<T extends Node>(node: T, comments: SynthesizedComment[] | undefined): T;
+    function addSyntheticLeadingComment<T extends Node>(node: T, kind: SyntaxKind.SingleLineCommentTrivia | SyntaxKind.MultiLineCommentTrivia, text: string, hasTrailingNewLine?: boolean): T;
+    function getSyntheticTrailingComments(node: Node): SynthesizedComment[] | undefined;
+    function setSyntheticTrailingComments<T extends Node>(node: T, comments: SynthesizedComment[] | undefined): T;
+    function addSyntheticTrailingComment<T extends Node>(node: T, kind: SyntaxKind.SingleLineCommentTrivia | SyntaxKind.MultiLineCommentTrivia, text: string, hasTrailingNewLine?: boolean): T;
+    function moveSyntheticComments<T extends Node>(node: T, original: Node): T;
+    /**
+     * Gets the constant value to emit for an expression.
+     */
+    function getConstantValue(node: PropertyAccessExpression | ElementAccessExpression): string | number | undefined;
+    /**
+     * Sets the constant value to emit for an expression.
+     */
+    function setConstantValue(node: PropertyAccessExpression | ElementAccessExpression, value: string | number): PropertyAccessExpression | ElementAccessExpression;
+    /**
+     * Adds an EmitHelper to a node.
+     */
+    function addEmitHelper<T extends Node>(node: T, helper: EmitHelper): T;
+    /**
+     * Add EmitHelpers to a node.
+     */
+    function addEmitHelpers<T extends Node>(node: T, helpers: EmitHelper[] | undefined): T;
+    /**
+     * Removes an EmitHelper from a node.
+     */
+    function removeEmitHelper(node: Node, helper: EmitHelper): boolean;
+    /**
+     * Gets the EmitHelpers of a node.
+     */
+    function getEmitHelpers(node: Node): EmitHelper[] | undefined;
+    /**
+     * Moves matching emit helpers from a source node to a target node.
+     */
+    function moveEmitHelpers(source: Node, target: Node, predicate: (helper: EmitHelper) => boolean): void;
+    function compareEmitHelpers(x: EmitHelper, y: EmitHelper): Comparison;
+    function setOriginalNode<T extends Node>(node: T, original: Node | undefined): T;
+}
+declare namespace ts {
+    const nullTransformationContext: TransformationContext;
+    type TypeOfTag = "undefined" | "number" | "boolean" | "string" | "symbol" | "object" | "function";
+    function createTypeCheck(value: Expression, tag: TypeOfTag): BinaryExpression;
+    function createMemberAccessForPropertyName(target: Expression, memberName: PropertyName, location?: TextRange): MemberExpression;
+    function createFunctionCall(func: Expression, thisArg: Expression, argumentsList: ReadonlyArray<Expression>, location?: TextRange): CallExpression;
+    function createFunctionApply(func: Expression, thisArg: Expression, argumentsExpression: Expression, location?: TextRange): CallExpression;
+    function createArraySlice(array: Expression, start?: number | Expression): CallExpression;
+    function createArrayConcat(array: Expression, values: ReadonlyArray<Expression>): CallExpression;
+    function createMathPow(left: Expression, right: Expression, location?: TextRange): CallExpression;
+    function createExpressionForJsxElement(jsxFactoryEntity: EntityName | undefined, reactNamespace: string, tagName: Expression, props: Expression, children: ReadonlyArray<Expression>, parentElement: JsxOpeningLikeElement, location: TextRange): LeftHandSideExpression;
+    function createExpressionForJsxFragment(jsxFactoryEntity: EntityName | undefined, reactNamespace: string, children: ReadonlyArray<Expression>, parentElement: JsxOpeningFragment, location: TextRange): LeftHandSideExpression;
+    function getHelperName(name: string): Identifier;
+    function createValuesHelper(context: TransformationContext, expression: Expression, location?: TextRange): CallExpression;
+    function createReadHelper(context: TransformationContext, iteratorRecord: Expression, count: number | undefined, location?: TextRange): CallExpression;
+    function createSpreadHelper(context: TransformationContext, argumentList: ReadonlyArray<Expression>, location?: TextRange): CallExpression;
+    function createForOfBindingStatement(node: ForInitializer, boundValue: Expression): Statement;
+    function insertLeadingStatement(dest: Statement, source: Statement): Block;
+    function restoreEnclosingLabel(node: Statement, outermostLabeledStatement: LabeledStatement | undefined, afterRestoreLabelCallback?: (node: LabeledStatement) => void): Statement;
+    interface CallBinding {
+        target: LeftHandSideExpression;
+        thisArg: Expression;
+    }
+    function createCallBinding(expression: Expression, recordTempVariable: (temp: Identifier) => void, languageVersion?: ScriptTarget, cacheIdentifiers?: boolean): CallBinding;
+    function inlineExpressions(expressions: ReadonlyArray<Expression>): Expression;
+    function createExpressionFromEntityName(node: EntityName | Expression): Expression;
+    function createExpressionForPropertyName(memberName: PropertyName): Expression;
+    function createExpressionForObjectLiteralElementLike(node: ObjectLiteralExpression, property: ObjectLiteralElementLike, receiver: Expression): Expression | undefined;
+    /**
+     * Gets the internal name of a declaration. This is primarily used for declarations that can be
+     * referred to by name in the body of an ES5 class function body. An internal name will *never*
+     * be prefixed with an module or namespace export modifier like "exports." when emitted as an
+     * expression. An internal name will also *never* be renamed due to a collision with a block
+     * scoped variable.
+     *
+     * @param node The declaration.
+     * @param allowComments A value indicating whether comments may be emitted for the name.
+     * @param allowSourceMaps A value indicating whether source maps may be emitted for the name.
+     */
+    function getInternalName(node: Declaration, allowComments?: boolean, allowSourceMaps?: boolean): Identifier;
+    /**
+     * Gets whether an identifier should only be referred to by its internal name.
+     */
+    function isInternalName(node: Identifier): boolean;
+    /**
+     * Gets the local name of a declaration. This is primarily used for declarations that can be
+     * referred to by name in the declaration's immediate scope (classes, enums, namespaces). A
+     * local name will *never* be prefixed with an module or namespace export modifier like
+     * "exports." when emitted as an expression.
+     *
+     * @param node The declaration.
+     * @param allowComments A value indicating whether comments may be emitted for the name.
+     * @param allowSourceMaps A value indicating whether source maps may be emitted for the name.
+     */
+    function getLocalName(node: Declaration, allowComments?: boolean, allowSourceMaps?: boolean): Identifier;
+    /**
+     * Gets whether an identifier should only be referred to by its local name.
+     */
+    function isLocalName(node: Identifier): boolean;
+    /**
+     * Gets the export name of a declaration. This is primarily used for declarations that can be
+     * referred to by name in the declaration's immediate scope (classes, enums, namespaces). An
+     * export name will *always* be prefixed with an module or namespace export modifier like
+     * `"exports."` when emitted as an expression if the name points to an exported symbol.
+     *
+     * @param node The declaration.
+     * @param allowComments A value indicating whether comments may be emitted for the name.
+     * @param allowSourceMaps A value indicating whether source maps may be emitted for the name.
+     */
+    function getExportName(node: Declaration, allowComments?: boolean, allowSourceMaps?: boolean): Identifier;
+    /**
+     * Gets whether an identifier should only be referred to by its export representation if the
+     * name points to an exported symbol.
+     */
+    function isExportName(node: Identifier): boolean;
+    /**
+     * Gets the name of a declaration for use in declarations.
+     *
+     * @param node The declaration.
+     * @param allowComments A value indicating whether comments may be emitted for the name.
+     * @param allowSourceMaps A value indicating whether source maps may be emitted for the name.
+     */
+    function getDeclarationName(node: Declaration, allowComments?: boolean, allowSourceMaps?: boolean): Identifier;
+    /**
+     * Gets the exported name of a declaration for use in expressions.
+     *
+     * An exported name will *always* be prefixed with an module or namespace export modifier like
+     * "exports." if the name points to an exported symbol.
+     *
+     * @param ns The namespace identifier.
+     * @param node The declaration.
+     * @param allowComments A value indicating whether comments may be emitted for the name.
+     * @param allowSourceMaps A value indicating whether source maps may be emitted for the name.
+     */
+    function getExternalModuleOrNamespaceExportName(ns: Identifier | undefined, node: Declaration, allowComments?: boolean, allowSourceMaps?: boolean): Identifier | PropertyAccessExpression;
+    /**
+     * Gets a namespace-qualified name for use in expressions.
+     *
+     * @param ns The namespace identifier.
+     * @param name The name.
+     * @param allowComments A value indicating whether comments may be emitted for the name.
+     * @param allowSourceMaps A value indicating whether source maps may be emitted for the name.
+     */
+    function getNamespaceMemberName(ns: Identifier, name: Identifier, allowComments?: boolean, allowSourceMaps?: boolean): PropertyAccessExpression;
+    function convertToFunctionBody(node: ConciseBody, multiLine?: boolean): Block;
+    function convertFunctionDeclarationToExpression(node: FunctionDeclaration): FunctionExpression;
+    /**
+     * Add any necessary prologue-directives into target statement-array.
+     * The function needs to be called during each transformation step.
+     * This function needs to be called whenever we transform the statement
+     * list of a source file, namespace, or function-like body.
+     *
+     * @param target: result statements array
+     * @param source: origin statements array
+     * @param ensureUseStrict: boolean determining whether the function need to add prologue-directives
+     * @param visitor: Optional callback used to visit any custom prologue directives.
+     */
+    function addPrologue(target: Statement[], source: ReadonlyArray<Statement>, ensureUseStrict?: boolean, visitor?: (node: Node) => VisitResult<Node>): number;
+    /**
+     * Add just the standard (string-expression) prologue-directives into target statement-array.
+     * The function needs to be called during each transformation step.
+     * This function needs to be called whenever we transform the statement
+     * list of a source file, namespace, or function-like body.
+     */
+    function addStandardPrologue(target: Statement[], source: ReadonlyArray<Statement>, ensureUseStrict?: boolean): number;
+    /**
+     * Add just the custom prologue-directives into target statement-array.
+     * The function needs to be called during each transformation step.
+     * This function needs to be called whenever we transform the statement
+     * list of a source file, namespace, or function-like body.
+     */
+    function addCustomPrologue(target: Statement[], source: ReadonlyArray<Statement>, statementOffset: number, visitor?: (node: Node) => VisitResult<Node>): number;
+    function addCustomPrologue(target: Statement[], source: ReadonlyArray<Statement>, statementOffset: number | undefined, visitor?: (node: Node) => VisitResult<Node>): number | undefined;
+    function startsWithUseStrict(statements: ReadonlyArray<Statement>): boolean;
+    /**
+     * Ensures "use strict" directive is added
+     *
+     * @param statements An array of statements
+     */
+    function ensureUseStrict(statements: NodeArray<Statement>): NodeArray<Statement>;
+    /**
+     * Wraps the operand to a BinaryExpression in parentheses if they are needed to preserve the intended
+     * order of operations.
+     *
+     * @param binaryOperator The operator for the BinaryExpression.
+     * @param operand The operand for the BinaryExpression.
+     * @param isLeftSideOfBinary A value indicating whether the operand is the left side of the
+     *                           BinaryExpression.
+     */
+    function parenthesizeBinaryOperand(binaryOperator: SyntaxKind, operand: Expression, isLeftSideOfBinary: boolean, leftOperand?: Expression): Expression;
+    function parenthesizeForConditionalHead(condition: Expression): Expression;
+    function parenthesizeSubexpressionOfConditionalExpression(e: Expression): Expression;
+    /**
+     *  [Per the spec](https://tc39.github.io/ecma262/#prod-ExportDeclaration), `export default` accepts _AssigmentExpression_ but
+     *  has a lookahead restriction for `function`, `async function`, and `class`.
+     *
+     * Basically, that means we need to parenthesize in the following cases:
+     *
+     * - BinaryExpression of CommaToken
+     * - CommaList (synthetic list of multiple comma expressions)
+     * - FunctionExpression
+     * - ClassExpression
+     */
+    function parenthesizeDefaultExpression(e: Expression): Expression;
+    /**
+     * Wraps an expression in parentheses if it is needed in order to use the expression
+     * as the expression of a NewExpression node.
+     *
+     * @param expression The Expression node.
+     */
+    function parenthesizeForNew(expression: Expression): LeftHandSideExpression;
+    /**
+     * Wraps an expression in parentheses if it is needed in order to use the expression for
+     * property or element access.
+     *
+     * @param expr The expression node.
+     */
+    function parenthesizeForAccess(expression: Expression): LeftHandSideExpression;
+    function parenthesizePostfixOperand(operand: Expression): LeftHandSideExpression;
+    function parenthesizePrefixOperand(operand: Expression): UnaryExpression;
+    function parenthesizeListElements(elements: NodeArray<Expression>): NodeArray<Expression>;
+    function parenthesizeExpressionForList(expression: Expression): Expression;
+    function parenthesizeExpressionForExpressionStatement(expression: Expression): Expression;
+    function parenthesizeConditionalTypeMember(member: TypeNode): TypeNode;
+    function parenthesizeElementTypeMember(member: TypeNode): TypeNode;
+    function parenthesizeArrayTypeMember(member: TypeNode): TypeNode;
+    function parenthesizeElementTypeMembers(members: ReadonlyArray<TypeNode>): NodeArray<TypeNode>;
+    function parenthesizeTypeParameters(typeParameters: ReadonlyArray<TypeNode> | undefined): MutableNodeArray<TypeNode> | undefined;
+    function parenthesizeConciseBody(body: ConciseBody): ConciseBody;
+    enum OuterExpressionKinds {
+        Parentheses = 1,
+        Assertions = 2,
+        PartiallyEmittedExpressions = 4,
+        All = 7
+    }
+    type OuterExpression = ParenthesizedExpression | TypeAssertion | AsExpression | NonNullExpression | PartiallyEmittedExpression;
+    function isOuterExpression(node: Node, kinds?: OuterExpressionKinds): node is OuterExpression;
+    function skipOuterExpressions(node: Expression, kinds?: OuterExpressionKinds): Expression;
+    function skipOuterExpressions(node: Node, kinds?: OuterExpressionKinds): Node;
+    function skipAssertions(node: Expression): Expression;
+    function skipAssertions(node: Node): Node;
+    function recreateOuterExpressions(outerExpression: Expression | undefined, innerExpression: Expression, kinds?: OuterExpressionKinds): Expression;
+    function startOnNewLine<T extends Node>(node: T): T;
+    function getExternalHelpersModuleName(node: SourceFile): Identifier | undefined;
+    function getOrCreateExternalHelpersModuleNameIfNeeded(node: SourceFile, compilerOptions: CompilerOptions, hasExportStarsToExportValues?: boolean, hasImportStarOrImportDefault?: boolean): Identifier | undefined;
+    /**
+     * Get the name of that target module from an import or export declaration
+     */
+    function getLocalNameForExternalImport(node: ImportDeclaration | ExportDeclaration | ImportEqualsDeclaration, sourceFile: SourceFile): Identifier | undefined;
+    /**
+     * Get the name of a target module from an import/export declaration as should be written in the emitted output.
+     * The emitted output name can be different from the input if:
+     *  1. The module has a /// <amd-module name="<new name>" />
+     *  2. --out or --outFile is used, making the name relative to the rootDir
+     *  3- The containing SourceFile has an entry in renamedDependencies for the import as requested by some module loaders (e.g. System).
+     * Otherwise, a new StringLiteral node representing the module name will be returned.
+     */
+    function getExternalModuleNameLiteral(importNode: ImportDeclaration | ExportDeclaration | ImportEqualsDeclaration, sourceFile: SourceFile, host: EmitHost, resolver: EmitResolver, compilerOptions: CompilerOptions): StringLiteral | undefined;
+    /**
+     * Get the name of a module as should be written in the emitted output.
+     * The emitted output name can be different from the input if:
+     *  1. The module has a /// <amd-module name="<new name>" />
+     *  2. --out or --outFile is used, making the name relative to the rootDir
+     * Otherwise, a new StringLiteral node representing the module name will be returned.
+     */
+    function tryGetModuleNameFromFile(file: SourceFile | undefined, host: EmitHost, options: CompilerOptions): StringLiteral | undefined;
+    /**
+     * Gets the initializer of an BindingOrAssignmentElement.
+     */
+    function getInitializerOfBindingOrAssignmentElement(bindingElement: BindingOrAssignmentElement): Expression | undefined;
+    /**
+     * Gets the name of an BindingOrAssignmentElement.
+     */
+    function getTargetOfBindingOrAssignmentElement(bindingElement: BindingOrAssignmentElement): BindingOrAssignmentElementTarget | undefined;
+    /**
+     * Determines whether an BindingOrAssignmentElement is a rest element.
+     */
+    function getRestIndicatorOfBindingOrAssignmentElement(bindingElement: BindingOrAssignmentElement): BindingOrAssignmentElementRestIndicator | undefined;
+    /**
+     * Gets the property name of a BindingOrAssignmentElement
+     */
+    function getPropertyNameOfBindingOrAssignmentElement(bindingElement: BindingOrAssignmentElement): Identifier | StringLiteral | NumericLiteral | ComputedPropertyName | undefined;
+    /**
+     * Gets the elements of a BindingOrAssignmentPattern
+     */
+    function getElementsOfBindingOrAssignmentPattern(name: BindingOrAssignmentPattern): ReadonlyArray<BindingOrAssignmentElement>;
+    function convertToArrayAssignmentElement(element: BindingOrAssignmentElement): Expression;
+    function convertToObjectAssignmentElement(element: BindingOrAssignmentElement): ObjectLiteralElementLike;
+    function convertToAssignmentPattern(node: BindingOrAssignmentPattern): AssignmentPattern;
+    function convertToObjectAssignmentPattern(node: ObjectBindingOrAssignmentPattern): ObjectLiteralExpression;
+    function convertToArrayAssignmentPattern(node: ArrayBindingOrAssignmentPattern): ArrayLiteralExpression;
+    function convertToAssignmentElementTarget(node: BindingOrAssignmentElementTarget): Expression;
+}
+declare namespace ts {
+    /**
+     * Visits a Node using the supplied visitor, possibly returning a new Node in its place.
+     *
+     * @param node The Node to visit.
+     * @param visitor The callback used to visit the Node.
+     * @param test A callback to execute to verify the Node is valid.
+     * @param lift An optional callback to execute to lift a NodeArray into a valid Node.
+     */
+    function visitNode<T extends Node>(node: T | undefined, visitor: Visitor | undefined, test?: (node: Node) => boolean, lift?: (node: NodeArray<Node>) => T): T;
+    /**
+     * Visits a Node using the supplied visitor, possibly returning a new Node in its place.
+     *
+     * @param node The Node to visit.
+     * @param visitor The callback used to visit the Node.
+     * @param test A callback to execute to verify the Node is valid.
+     * @param lift An optional callback to execute to lift a NodeArray into a valid Node.
+     */
+    function visitNode<T extends Node>(node: T | undefined, visitor: Visitor | undefined, test?: (node: Node) => boolean, lift?: (node: NodeArray<Node>) => T): T | undefined;
+    /**
+     * Visits a NodeArray using the supplied visitor, possibly returning a new NodeArray in its place.
+     *
+     * @param nodes The NodeArray to visit.
+     * @param visitor The callback used to visit a Node.
+     * @param test A node test to execute for each node.
+     * @param start An optional value indicating the starting offset at which to start visiting.
+     * @param count An optional value indicating the maximum number of nodes to visit.
+     */
+    function visitNodes<T extends Node>(nodes: NodeArray<T> | undefined, visitor: Visitor, test?: (node: Node) => boolean, start?: number, count?: number): NodeArray<T>;
+    /**
+     * Visits a NodeArray using the supplied visitor, possibly returning a new NodeArray in its place.
+     *
+     * @param nodes The NodeArray to visit.
+     * @param visitor The callback used to visit a Node.
+     * @param test A node test to execute for each node.
+     * @param start An optional value indicating the starting offset at which to start visiting.
+     * @param count An optional value indicating the maximum number of nodes to visit.
+     */
+    function visitNodes<T extends Node>(nodes: NodeArray<T> | undefined, visitor: Visitor, test?: (node: Node) => boolean, start?: number, count?: number): NodeArray<T> | undefined;
+    /**
+     * Starts a new lexical environment and visits a statement list, ending the lexical environment
+     * and merging hoisted declarations upon completion.
+     */
+    function visitLexicalEnvironment(statements: NodeArray<Statement>, visitor: Visitor, context: TransformationContext, start?: number, ensureUseStrict?: boolean): NodeArray<Statement>;
+    /**
+     * Starts a new lexical environment and visits a parameter list, suspending the lexical
+     * environment upon completion.
+     */
+    function visitParameterList(nodes: NodeArray<ParameterDeclaration> | undefined, visitor: Visitor, context: TransformationContext, nodesVisitor?: typeof visitNodes): NodeArray<ParameterDeclaration>;
+    /**
+     * Resumes a suspended lexical environment and visits a function body, ending the lexical
+     * environment and merging hoisted declarations upon completion.
+     */
+    function visitFunctionBody(node: FunctionBody, visitor: Visitor, context: TransformationContext): FunctionBody;
+    /**
+     * Resumes a suspended lexical environment and visits a function body, ending the lexical
+     * environment and merging hoisted declarations upon completion.
+     */
+    function visitFunctionBody(node: FunctionBody | undefined, visitor: Visitor, context: TransformationContext): FunctionBody | undefined;
+    /**
+     * Resumes a suspended lexical environment and visits a concise body, ending the lexical
+     * environment and merging hoisted declarations upon completion.
+     */
+    function visitFunctionBody(node: ConciseBody, visitor: Visitor, context: TransformationContext): ConciseBody;
+    /**
+     * Visits each child of a Node using the supplied visitor, possibly returning a new Node of the same kind in its place.
+     *
+     * @param node The Node whose children will be visited.
+     * @param visitor The callback used to visit each child.
+     * @param context A lexical environment context for the visitor.
+     */
+    function visitEachChild<T extends Node>(node: T, visitor: Visitor, context: TransformationContext): T;
+    /**
+     * Visits each child of a Node using the supplied visitor, possibly returning a new Node of the same kind in its place.
+     *
+     * @param node The Node whose children will be visited.
+     * @param visitor The callback used to visit each child.
+     * @param context A lexical environment context for the visitor.
+     */
+    function visitEachChild<T extends Node>(node: T | undefined, visitor: Visitor, context: TransformationContext, nodesVisitor?: typeof visitNodes, tokenVisitor?: Visitor): T | undefined;
+}
+declare namespace ts {
+    /**
+     * Similar to `reduceLeft`, performs a reduction against each child of a node.
+     * NOTE: Unlike `forEachChild`, this does *not* visit every node.
+     *
+     * @param node The node containing the children to reduce.
+     * @param initial The initial value to supply to the reduction.
+     * @param f The callback function
+     */
+    function reduceEachChild<T>(node: Node | undefined, initial: T, cbNode: (memo: T, node: Node) => T, cbNodeArray?: (memo: T, nodes: NodeArray<Node>) => T): T;
+    /**
+     * Merges generated lexical declarations into a new statement list.
+     */
+    function mergeLexicalEnvironment(statements: NodeArray<Statement>, declarations: ReadonlyArray<Statement> | undefined): NodeArray<Statement>;
+    /**
+     * Appends generated lexical declarations to an array of statements.
+     */
+    function mergeLexicalEnvironment(statements: Statement[], declarations: ReadonlyArray<Statement> | undefined): Statement[];
+    /**
+     * Lifts a NodeArray containing only Statement nodes to a block.
+     *
+     * @param nodes The NodeArray.
+     */
+    function liftToBlock(nodes: ReadonlyArray<Node>): Statement;
+    /**
+     * Aggregates the TransformFlags for a Node and its subtree.
+     */
+    function aggregateTransformFlags<T extends Node>(node: T): T;
+    namespace Debug {
+        function failBadSyntaxKind(node: Node, message?: string): never;
+        const assertEachNode: (nodes: Node[], test: (node: Node) => boolean, message?: string | undefined) => void;
+        const assertNode: (node: Node | undefined, test: ((node: Node | undefined) => boolean) | undefined, message?: string | undefined) => void;
+        const assertOptionalNode: (node: Node, test: (node: Node) => boolean, message?: string | undefined) => void;
+        const assertOptionalToken: (node: Node, kind: SyntaxKind, message?: string | undefined) => void;
+        const assertMissingNode: typeof noop;
+        /**
+         * Injects debug information into frequently used types.
+         */
+        function enableDebugInfo(): void;
+    }
+}
+declare namespace ts {
+    function getOriginalNodeId(node: Node): number;
+    interface ExternalModuleInfo {
+        externalImports: (ImportDeclaration | ImportEqualsDeclaration | ExportDeclaration)[];
+        externalHelpersImportDeclaration: ImportDeclaration | undefined;
+        exportSpecifiers: Map<ExportSpecifier[]>;
+        exportedBindings: Identifier[][];
+        exportedNames: Identifier[] | undefined;
+        exportEquals: ExportAssignment | undefined;
+        hasExportStarsToExportValues: boolean;
+    }
+    function chainBundle(transformSourceFile: (x: SourceFile) => SourceFile): (x: SourceFile | Bundle) => SourceFile | Bundle;
+    function getImportNeedsImportStarHelper(node: ImportDeclaration): boolean;
+    function getImportNeedsImportDefaultHelper(node: ImportDeclaration): boolean;
+    function collectExternalModuleInfo(sourceFile: SourceFile, resolver: EmitResolver, compilerOptions: CompilerOptions): ExternalModuleInfo;
+    /**
+     * Used in the module transformer to check if an expression is reasonably without sideeffect,
+     *  and thus better to copy into multiple places rather than to cache in a temporary variable
+     *  - this is mostly subjective beyond the requirement that the expression not be sideeffecting
+     */
+    function isSimpleCopiableExpression(expression: Expression): boolean;
+    /**
+     * @param input Template string input strings
+     * @param args Names which need to be made file-level unique
+     */
+    function helperString(input: TemplateStringsArray, ...args: string[]): (uniqueName: EmitHelperUniqueNameCallback) => string;
+}
+declare namespace ts {
+    enum FlattenLevel {
+        All = 0,
+        ObjectRest = 1
+    }
+    /**
+     * Flattens a DestructuringAssignment or a VariableDeclaration to an expression.
+     *
+     * @param node The node to flatten.
+     * @param visitor An optional visitor used to visit initializers.
+     * @param context The transformation context.
+     * @param level Indicates the extent to which flattening should occur.
+     * @param needsValue An optional value indicating whether the value from the right-hand-side of
+     * the destructuring assignment is needed as part of a larger expression.
+     * @param createAssignmentCallback An optional callback used to create the assignment expression.
+     */
+    function flattenDestructuringAssignment(node: VariableDeclaration | DestructuringAssignment, visitor: ((node: Node) => VisitResult<Node>) | undefined, context: TransformationContext, level: FlattenLevel, needsValue?: boolean, createAssignmentCallback?: (name: Identifier, value: Expression, location?: TextRange) => Expression): Expression;
+    /**
+     * Flattens a VariableDeclaration or ParameterDeclaration to one or more variable declarations.
+     *
+     * @param node The node to flatten.
+     * @param visitor An optional visitor used to visit initializers.
+     * @param context The transformation context.
+     * @param boundValue The value bound to the declaration.
+     * @param skipInitializer A value indicating whether to ignore the initializer of `node`.
+     * @param hoistTempVariables Indicates whether temporary variables should not be recorded in-line.
+     * @param level Indicates the extent to which flattening should occur.
+     */
+    function flattenDestructuringBinding(node: VariableDeclaration | ParameterDeclaration, visitor: (node: Node) => VisitResult<Node>, context: TransformationContext, level: FlattenLevel, rval?: Expression, hoistTempVariables?: boolean, skipInitializer?: boolean): VariableDeclaration[];
+}
+declare namespace ts {
+    function transformTypeScript(context: TransformationContext): (node: SourceFile | Bundle) => SourceFile | Bundle;
+}
+declare namespace ts {
+    function transformES2017(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle;
+    const asyncSuperHelper: EmitHelper;
+    const advancedAsyncSuperHelper: EmitHelper;
+}
+declare namespace ts {
+    function transformESNext(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle;
+    function createAssignHelper(context: TransformationContext, attributesSegments: Expression[]): CallExpression;
+}
+declare namespace ts {
+    function transformJsx(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle;
+}
+declare namespace ts {
+    function transformES2016(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle;
+}
+declare namespace ts {
+    function transformES2015(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle;
+}
+declare namespace ts {
+    /**
+     * Transforms ES5 syntax into ES3 syntax.
+     *
+     * @param context Context and state information for the transformation.
+     */
+    function transformES5(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle;
+}
+declare namespace ts {
+    function transformGenerators(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle;
+}
+declare namespace ts {
+    function transformModule(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle;
+}
+declare namespace ts {
+    function transformSystemModule(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle;
+}
+declare namespace ts {
+    function transformES2015Module(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle;
+}
+declare namespace ts {
+    type GetSymbolAccessibilityDiagnostic = (symbolAccessibilityResult: SymbolAccessibilityResult) => (SymbolAccessibilityDiagnostic | undefined);
+    interface SymbolAccessibilityDiagnostic {
+        errorNode: Node;
+        diagnosticMessage: DiagnosticMessage;
+        typeName?: DeclarationName | QualifiedName;
+    }
+    type DeclarationDiagnosticProducing = VariableDeclaration | PropertyDeclaration | PropertySignature | BindingElement | SetAccessorDeclaration | GetAccessorDeclaration | ConstructSignatureDeclaration | CallSignatureDeclaration | MethodDeclaration | MethodSignature | FunctionDeclaration | ParameterDeclaration | TypeParameterDeclaration | ExpressionWithTypeArguments | ImportEqualsDeclaration | TypeAliasDeclaration | ConstructorDeclaration | IndexSignatureDeclaration;
+    function canProduceDiagnostics(node: Node): node is DeclarationDiagnosticProducing;
+    function createGetSymbolAccessibilityDiagnosticForNodeName(node: DeclarationDiagnosticProducing): (symbolAccessibilityResult: SymbolAccessibilityResult) => SymbolAccessibilityDiagnostic | undefined;
+    function createGetSymbolAccessibilityDiagnosticForNode(node: DeclarationDiagnosticProducing): (symbolAccessibilityResult: SymbolAccessibilityResult) => SymbolAccessibilityDiagnostic | undefined;
+}
+declare namespace ts {
+    function getDeclarationDiagnostics(host: EmitHost, resolver: EmitResolver, file: SourceFile | undefined): DiagnosticWithLocation[] | undefined;
+    /**
+     * Transforms a ts file into a .d.ts file
+     * This process requires type information, which is retrieved through the emit resolver. Because of this,
+     * in many places this transformer assumes it will be operating on parse tree nodes directly.
+     * This means that _no transforms should be allowed to occur before this one_.
+     */
+    function transformDeclarations(context: TransformationContext): {
+        (node: Bundle): Bundle;
+        (node: SourceFile): SourceFile;
+        (node: SourceFile | Bundle): SourceFile | Bundle;
+    };
+}
+declare namespace ts {
+    function getTransformers(compilerOptions: CompilerOptions, customTransformers?: CustomTransformers): TransformerFactory<SourceFile | Bundle>[];
+    /**
+     * Transforms an array of SourceFiles by passing them through each transformer.
+     *
+     * @param resolver The emit resolver provided by the checker.
+     * @param host The emit host object used to interact with the file system.
+     * @param options Compiler options to surface in the `TransformationContext`.
+     * @param nodes An array of nodes to transform.
+     * @param transforms An array of `TransformerFactory` callbacks.
+     * @param allowDtsFiles A value indicating whether to allow the transformation of .d.ts files.
+     */
+    function transformNodes<T extends Node>(resolver: EmitResolver | undefined, host: EmitHost | undefined, options: CompilerOptions, nodes: ReadonlyArray<T>, transformers: ReadonlyArray<TransformerFactory<T>>, allowDtsFiles: boolean): TransformationResult<T>;
+}
+declare namespace ts {
+    interface SourceMapWriter {
+        /**
+         * Initialize the SourceMapWriter for a new output file.
+         *
+         * @param filePath The path to the generated output file.
+         * @param sourceMapFilePath The path to the output source map file.
+         * @param sourceFileOrBundle The input source file or bundle for the program.
+         */
+        initialize(filePath: string, sourceMapFilePath: string | undefined, sourceFileOrBundle: SourceFile | Bundle, sourceMapOutput?: SourceMapData[]): void;
+        /**
+         * Reset the SourceMapWriter to an empty state.
+         */
+        reset(): void;
+        /**
+         * Set the current source file.
+         *
+         * @param sourceFile The source file.
+         */
+        setSourceFile(sourceFile: SourceMapSource): void;
+        /**
+         * Emits a mapping.
+         *
+         * If the position is synthetic (undefined or a negative value), no mapping will be
+         * created.
+         *
+         * @param pos The position.
+         */
+        emitPos(pos: number): void;
+        /**
+         * Emits a node with possible leading and trailing source maps.
+         *
+         * @param hint The current emit context
+         * @param node The node to emit.
+         * @param emitCallback The callback used to emit the node.
+         */
+        emitNodeWithSourceMap(hint: EmitHint, node: Node, emitCallback: (hint: EmitHint, node: Node) => void): void;
+        /**
+         * Emits a token of a node node with possible leading and trailing source maps.
+         *
+         * @param node The node containing the token.
+         * @param token The token to emit.
+         * @param tokenStartPos The start pos of the token.
+         * @param emitCallback The callback used to emit the token.
+         */
+        emitTokenWithSourceMap(node: Node, token: SyntaxKind, writer: (s: string) => void, tokenStartPos: number, emitCallback: (token: SyntaxKind, writer: (s: string) => void, tokenStartPos: number) => number): number;
+        /**
+         * Gets the text for the source map.
+         */
+        getText(): string;
+        /**
+         * Gets the SourceMappingURL for the source map.
+         */
+        getSourceMappingURL(): string;
+    }
+    interface SourceMapOptions {
+        sourceMap?: boolean;
+        inlineSourceMap?: boolean;
+        inlineSources?: boolean;
+        sourceRoot?: string;
+        mapRoot?: string;
+        extendedDiagnostics?: boolean;
+    }
+    function createSourceMapWriter(host: EmitHost, writer: EmitTextWriter, compilerOptions?: SourceMapOptions): SourceMapWriter;
+}
+declare namespace ts {
+    interface CommentWriter {
+        reset(): void;
+        setSourceFile(sourceFile: SourceFile): void;
+        setWriter(writer: EmitTextWriter | undefined): void;
+        emitNodeWithComments(hint: EmitHint, node: Node | undefined, emitCallback: (hint: EmitHint, node: Node) => void): void;
+        emitBodyWithDetachedComments(node: Node, detachedRange: TextRange, emitCallback: (node: Node) => void): void;
+        emitTrailingCommentsOfPosition(pos: number, prefixSpace?: boolean): void;
+        emitLeadingCommentsOfPosition(pos: number): void;
+    }
+    function createCommentWriter(printerOptions: PrinterOptions, emitPos: ((pos: number) => void) | undefined): CommentWriter;
+}
+declare namespace ts {
+    /**
+     * Iterates over the source files that are expected to have an emit output.
+     *
+     * @param host An EmitHost.
+     * @param action The action to execute.
+     * @param sourceFilesOrTargetSourceFile
+     *   If an array, the full list of source files to emit.
+     *   Else, calls `getSourceFilesToEmit` with the (optional) target source file to determine the list of source files to emit.
+     */
+    function forEachEmittedFile<T>(host: EmitHost, action: (emitFileNames: EmitFileNames, sourceFileOrBundle: SourceFile | Bundle) => T, sourceFilesOrTargetSourceFile?: ReadonlyArray<SourceFile> | SourceFile, emitOnlyDtsFiles?: boolean): T | undefined;
+    function getOutputPathsFor(sourceFile: SourceFile | Bundle, host: EmitHost, forceDtsPaths: boolean): EmitFileNames;
+    function getOutputExtension(sourceFile: SourceFile, options: CompilerOptions): Extension;
+    function emitFiles(resolver: EmitResolver, host: EmitHost, targetSourceFile: SourceFile, emitOnlyDtsFiles?: boolean, transformers?: TransformerFactory<Bundle | SourceFile>[], declarationTransformers?: TransformerFactory<Bundle | SourceFile>[]): EmitResult;
+    function createPrinter(printerOptions?: PrinterOptions, handlers?: PrintHandlers): Printer;
+}
+declare namespace ts {
+    /**
+     * Partial interface of the System thats needed to support the caching of directory structure
+     */
+    interface DirectoryStructureHost {
+        fileExists(path: string): boolean;
+        readFile(path: string, encoding?: string): string | undefined;
+        directoryExists?(path: string): boolean;
+        getDirectories?(path: string): string[];
+        readDirectory?(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
+        createDirectory?(path: string): void;
+        writeFile?(path: string, data: string, writeByteOrderMark?: boolean): void;
+    }
+    interface FileAndDirectoryExistence {
+        fileExists: boolean;
+        directoryExists: boolean;
+    }
+    interface CachedDirectoryStructureHost extends DirectoryStructureHost {
+        useCaseSensitiveFileNames: boolean;
+        getDirectories(path: string): string[];
+        readDirectory(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
+        /** Returns the queried result for the file exists and directory exists if at all it was done */
+        addOrDeleteFileOrDirectory(fileOrDirectory: string, fileOrDirectoryPath: Path): FileAndDirectoryExistence | undefined;
+        addOrDeleteFile(fileName: string, filePath: Path, eventKind: FileWatcherEventKind): void;
+        clearCache(): void;
+    }
+    function createCachedDirectoryStructureHost(host: DirectoryStructureHost, currentDirectory: string, useCaseSensitiveFileNames: boolean): CachedDirectoryStructureHost | undefined;
+    enum ConfigFileProgramReloadLevel {
+        None = 0,
+        /** Update the file name list from the disk */
+        Partial = 1,
+        /** Reload completely by re-reading contents of config file from disk and updating program */
+        Full = 2
+    }
+    /**
+     * Updates the existing missing file watches with the new set of missing files after new program is created
+     */
+    function updateMissingFilePathsWatch(program: Program, missingFileWatches: Map<FileWatcher>, createMissingFileWatch: (missingFilePath: Path) => FileWatcher): void;
+    interface WildcardDirectoryWatcher {
+        watcher: FileWatcher;
+        flags: WatchDirectoryFlags;
+    }
+    /**
+     * Updates the existing wild card directory watches with the new set of wild card directories from the config file
+     * after new program is created because the config file was reloaded or program was created first time from the config file
+     * Note that there is no need to call this function when the program is updated with additional files without reloading config files,
+     * as wildcard directories wont change unless reloading config file
+     */
+    function updateWatchingWildcardDirectories(existingWatchedForWildcards: Map<WildcardDirectoryWatcher>, wildcardDirectories: Map<WatchDirectoryFlags>, watchDirectory: (directory: string, flags: WatchDirectoryFlags) => FileWatcher): void;
+    function isEmittedFileOfProgram(program: Program | undefined, file: string): boolean;
+    enum WatchLogLevel {
+        None = 0,
+        TriggerOnly = 1,
+        Verbose = 2
+    }
+    interface WatchFileHost {
+        watchFile(path: string, callback: FileWatcherCallback, pollingInterval?: number): FileWatcher;
+    }
+    interface WatchDirectoryHost {
+        watchDirectory(path: string, callback: DirectoryWatcherCallback, recursive?: boolean): FileWatcher;
+    }
+    type WatchFile<X, Y> = (host: WatchFileHost, file: string, callback: FileWatcherCallback, pollingInterval: PollingInterval, detailInfo1?: X, detailInfo2?: Y) => FileWatcher;
+    type FilePathWatcherCallback = (fileName: string, eventKind: FileWatcherEventKind, filePath: Path) => void;
+    type WatchFilePath<X, Y> = (host: WatchFileHost, file: string, callback: FilePathWatcherCallback, pollingInterval: PollingInterval, path: Path, detailInfo1?: X, detailInfo2?: Y) => FileWatcher;
+    type WatchDirectory<X, Y> = (host: WatchDirectoryHost, directory: string, callback: DirectoryWatcherCallback, flags: WatchDirectoryFlags, detailInfo1?: X, detailInfo2?: Y) => FileWatcher;
+    interface WatchFactory<X, Y> {
+        watchFile: WatchFile<X, Y>;
+        watchFilePath: WatchFilePath<X, Y>;
+        watchDirectory: WatchDirectory<X, Y>;
+    }
+    function getWatchFactory<X, Y = undefined>(watchLogLevel: WatchLogLevel, log: (s: string) => void, getDetailWatchInfo?: GetDetailWatchInfo<X, Y>): WatchFactory<X, Y>;
+    type GetDetailWatchInfo<X, Y> = (detailInfo1: X, detailInfo2: Y | undefined) => string;
+    function closeFileWatcherOf<T extends {
+        watcher: FileWatcher;
+    }>(objWithWatcher: T): void;
+}
+declare namespace ts {
+    function findConfigFile(searchPath: string, fileExists: (fileName: string) => boolean, configName?: string): string | undefined;
+    function resolveTripleslashReference(moduleName: string, containingFile: string): string;
+    function computeCommonSourceDirectoryOfFilenames(fileNames: string[], currentDirectory: string, getCanonicalFileName: GetCanonicalFileName): string;
+    function createCompilerHost(options: CompilerOptions, setParentNodes?: boolean): CompilerHost;
+    function getPreEmitDiagnostics(program: Program, sourceFile?: SourceFile, cancellationToken?: CancellationToken): Diagnostic[];
+    interface FormatDiagnosticsHost {
+        getCurrentDirectory(): string;
+        getCanonicalFileName(fileName: string): string;
+        getNewLine(): string;
+    }
+    function formatDiagnostics(diagnostics: ReadonlyArray<Diagnostic>, host: FormatDiagnosticsHost): string;
+    function formatDiagnostic(diagnostic: Diagnostic, host: FormatDiagnosticsHost): string;
+    /** @internal */
+    enum ForegroundColorEscapeSequences {
+        Grey = "\u001B[90m",
+        Red = "\u001B[91m",
+        Yellow = "\u001B[93m",
+        Blue = "\u001B[94m",
+        Cyan = "\u001B[96m"
+    }
+    /** @internal */
+    function formatColorAndReset(text: string, formatStyle: string): string;
+    function formatDiagnosticsWithColorAndContext(diagnostics: ReadonlyArray<Diagnostic>, host: FormatDiagnosticsHost): string;
+    function flattenDiagnosticMessageText(messageText: string | DiagnosticMessageChain | undefined, newLine: string): string;
+    /**
+     * Determines if program structure is upto date or needs to be recreated
+     */
+    function isProgramUptoDate(program: Program | undefined, rootFileNames: string[], newOptions: CompilerOptions, getSourceVersion: (path: Path) => string | undefined, fileExists: (fileName: string) => boolean, hasInvalidatedResolution: HasInvalidatedResolution, hasChangedAutomaticTypeDirectiveNames: boolean): boolean;
+    function getConfigFileParsingDiagnostics(configFileParseResult: ParsedCommandLine): ReadonlyArray<Diagnostic>;
+    /**
+     * Create a new 'Program' instance. A Program is an immutable collection of 'SourceFile's and a 'CompilerOptions'
+     * that represent a compilation unit.
+     *
+     * Creating a program proceeds from a set of root files, expanding the set of inputs by following imports and
+     * triple-slash-reference-path directives transitively. '@types' and triple-slash-reference-types are also pulled in.
+     *
+     * @param createProgramOptions - The options for creating a program.
+     * @returns A 'Program' object.
+     */
+    function createProgram(createProgramOptions: CreateProgramOptions): Program;
+    /**
+     * Create a new 'Program' instance. A Program is an immutable collection of 'SourceFile's and a 'CompilerOptions'
+     * that represent a compilation unit.
+     *
+     * Creating a program proceeds from a set of root files, expanding the set of inputs by following imports and
+     * triple-slash-reference-path directives transitively. '@types' and triple-slash-reference-types are also pulled in.
+     *
+     * @param rootNames - A set of root files.
+     * @param options - The compiler options which should be used.
+     * @param host - The host interacts with the underlying file system.
+     * @param oldProgram - Reuses an old program structure.
+     * @param configFileParsingDiagnostics - error during config file parsing
+     * @returns A 'Program' object.
+     */
+    function createProgram(rootNames: ReadonlyArray<string>, options: CompilerOptions, host?: CompilerHost, oldProgram?: Program, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>): Program;
+    function parseConfigHostFromCompilerHost(host: CompilerHost): ParseConfigFileHost;
+    /**
+     * Returns the target config filename of a project reference
+     */
+    function resolveProjectReferencePath(host: CompilerHost, ref: ProjectReference): string | undefined;
+    /**
+     * Returns a DiagnosticMessage if we won't include a resolved module due to its extension.
+     * The DiagnosticMessage's parameters are the imported module name, and the filename it resolved to.
+     * This returns a diagnostic even if the module will be an untyped module.
+     */
+    function getResolutionDiagnostic(options: CompilerOptions, { extension }: ResolvedModuleFull): DiagnosticMessage | undefined;
+}
+declare namespace ts {
+    interface EmitOutput {
+        outputFiles: OutputFile[];
+        emitSkipped: boolean;
+    }
+    interface OutputFile {
+        name: string;
+        writeByteOrderMark: boolean;
+        text: string;
+    }
+}
+declare namespace ts {
+    function getFileEmitOutput(program: Program, sourceFile: SourceFile, emitOnlyDtsFiles: boolean, cancellationToken?: CancellationToken, customTransformers?: CustomTransformers): EmitOutput;
+    interface BuilderState {
+        /**
+         * Information of the file eg. its version, signature etc
+         */
+        fileInfos: Map<BuilderState.FileInfo>;
+        /**
+         * Contains the map of ReferencedSet=Referenced files of the file if module emit is enabled
+         * Otherwise undefined
+         * Thus non undefined value indicates, module emit
+         */
+        readonly referencedMap: ReadonlyMap<BuilderState.ReferencedSet> | undefined;
+        /**
+         * Map of files that have already called update signature.
+         * That means hence forth these files are assumed to have
+         * no change in their signature for this version of the program
+         */
+        hasCalledUpdateShapeSignature: Map<true>;
+        /**
+         * Cache of all files excluding default library file for the current program
+         */
+        allFilesExcludingDefaultLibraryFile: ReadonlyArray<SourceFile> | undefined;
+        /**
+         * Cache of all the file names
+         */
+        allFileNames: ReadonlyArray<string> | undefined;
+    }
+}
+declare namespace ts.BuilderState {
+    /**
+     * Information about the source file: Its version and optional signature from last emit
+     */
+    interface FileInfo {
+        readonly version: string;
+        signature: string | undefined;
+    }
+    /**
+     * Referenced files with values for the keys as referenced file's path to be true
+     */
+    type ReferencedSet = ReadonlyMap<true>;
+    /**
+     * Compute the hash to store the shape of the file
+     */
+    type ComputeHash = (data: string) => string;
+    /**
+     * Returns true if oldState is reusable, that is the emitKind = module/non module has not changed
+     */
+    function canReuseOldState(newReferencedMap: ReadonlyMap<ReferencedSet> | undefined, oldState: Readonly<BuilderState> | undefined): boolean | undefined;
+    /**
+     * Creates the state of file references and signature for the new program from oldState if it is safe
+     */
+    function create(newProgram: Program, getCanonicalFileName: GetCanonicalFileName, oldState?: Readonly<BuilderState>): BuilderState;
+    /**
+     * Gets the files affected by the path from the program
+     */
+    function getFilesAffectedBy(state: BuilderState, programOfThisState: Program, path: Path, cancellationToken: CancellationToken | undefined, computeHash: ComputeHash, cacheToUpdateSignature?: Map<string>): ReadonlyArray<SourceFile>;
+    /**
+     * Updates the signatures from the cache into state's fileinfo signatures
+     * This should be called whenever it is safe to commit the state of the builder
+     */
+    function updateSignaturesFromCache(state: BuilderState, signatureCache: Map<string>): void;
+    /**
+     * Get all the dependencies of the sourceFile
+     */
+    function getAllDependencies(state: BuilderState, programOfThisState: Program, sourceFile: SourceFile): ReadonlyArray<string>;
+}
+declare namespace ts {
+    /**
+     * State to store the changed files, affected files and cache semantic diagnostics
+     */
+    interface BuilderProgramState extends BuilderState {
+        /**
+         * Cache of semantic diagnostics for files with their Path being the key
+         */
+        semanticDiagnosticsPerFile: Map<ReadonlyArray<Diagnostic>> | undefined;
+        /**
+         * The map has key by source file's path that has been changed
+         */
+        changedFilesSet: Map<true>;
+        /**
+         * Set of affected files being iterated
+         */
+        affectedFiles: ReadonlyArray<SourceFile> | undefined;
+        /**
+         * Current index to retrieve affected file from
+         */
+        affectedFilesIndex: number | undefined;
+        /**
+         * Current changed file for iterating over affected files
+         */
+        currentChangedFilePath: Path | undefined;
+        /**
+         * Map of file signatures, with key being file path, calculated while getting current changed file's affected files
+         * These will be commited whenever the iteration through affected files of current changed file is complete
+         */
+        currentAffectedFilesSignatures: Map<string> | undefined;
+        /**
+         * Already seen affected files
+         */
+        seenAffectedFiles: Map<true> | undefined;
+        /**
+         * program corresponding to this state
+         */
+        program: Program;
+    }
+    enum BuilderProgramKind {
+        SemanticDiagnosticsBuilderProgram = 0,
+        EmitAndSemanticDiagnosticsBuilderProgram = 1
+    }
+    interface BuilderCreationParameters {
+        newProgram: Program;
+        host: BuilderProgramHost;
+        oldProgram: BuilderProgram | undefined;
+        configFileParsingDiagnostics: ReadonlyArray<Diagnostic>;
+    }
+    function getBuilderCreationParameters(newProgramOrRootNames: Program | ReadonlyArray<string> | undefined, hostOrOptions: BuilderProgramHost | CompilerOptions | undefined, oldProgramOrHost?: BuilderProgram | CompilerHost, configFileParsingDiagnosticsOrOldProgram?: ReadonlyArray<Diagnostic> | BuilderProgram, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>): BuilderCreationParameters;
+    function createBuilderProgram(kind: BuilderProgramKind.SemanticDiagnosticsBuilderProgram, builderCreationParameters: BuilderCreationParameters): SemanticDiagnosticsBuilderProgram;
+    function createBuilderProgram(kind: BuilderProgramKind.EmitAndSemanticDiagnosticsBuilderProgram, builderCreationParameters: BuilderCreationParameters): EmitAndSemanticDiagnosticsBuilderProgram;
+}
+declare namespace ts {
+    type AffectedFileResult<T> = {
+        result: T;
+        affected: SourceFile | Program;
+    } | undefined;
+    interface BuilderProgramHost {
+        /**
+         * return true if file names are treated with case sensitivity
+         */
+        useCaseSensitiveFileNames(): boolean;
+        /**
+         * If provided this would be used this hash instead of actual file shape text for detecting changes
+         */
+        createHash?: (data: string) => string;
+        /**
+         * When emit or emitNextAffectedFile are called without writeFile,
+         * this callback if present would be used to write files
+         */
+        writeFile?: WriteFileCallback;
+    }
+    /**
+     * Builder to manage the program state changes
+     */
+    interface BuilderProgram {
+        getState(): BuilderProgramState;
+        /**
+         * Returns current program
+         */
+        getProgram(): Program;
+        /**
+         * Get compiler options of the program
+         */
+        getCompilerOptions(): CompilerOptions;
+        /**
+         * Get the source file in the program with file name
+         */
+        getSourceFile(fileName: string): SourceFile | undefined;
+        /**
+         * Get a list of files in the program
+         */
+        getSourceFiles(): ReadonlyArray<SourceFile>;
+        /**
+         * Get the diagnostics for compiler options
+         */
+        getOptionsDiagnostics(cancellationToken?: CancellationToken): ReadonlyArray<Diagnostic>;
+        /**
+         * Get the diagnostics that dont belong to any file
+         */
+        getGlobalDiagnostics(cancellationToken?: CancellationToken): ReadonlyArray<Diagnostic>;
+        /**
+         * Get the diagnostics from config file parsing
+         */
+        getConfigFileParsingDiagnostics(): ReadonlyArray<Diagnostic>;
+        /**
+         * Get the syntax diagnostics, for all source files if source file is not supplied
+         */
+        getSyntacticDiagnostics(sourceFile?: SourceFile, cancellationToken?: CancellationToken): ReadonlyArray<Diagnostic>;
+        /**
+         * Get all the dependencies of the file
+         */
+        getAllDependencies(sourceFile: SourceFile): ReadonlyArray<string>;
+        /**
+         * Gets the semantic diagnostics from the program corresponding to this state of file (if provided) or whole program
+         * The semantic diagnostics are cached and managed here
+         * Note that it is assumed that when asked about semantic diagnostics through this API,
+         * the file has been taken out of affected files so it is safe to use cache or get from program and cache the diagnostics
+         * In case of SemanticDiagnosticsBuilderProgram if the source file is not provided,
+         * it will iterate through all the affected files, to ensure that cache stays valid and yet provide a way to get all semantic diagnostics
+         */
+        getSemanticDiagnostics(sourceFile?: SourceFile, cancellationToken?: CancellationToken): ReadonlyArray<Diagnostic>;
+        /**
+         * Emits the JavaScript and declaration files.
+         * When targetSource file is specified, emits the files corresponding to that source file,
+         * otherwise for the whole program.
+         * In case of EmitAndSemanticDiagnosticsBuilderProgram, when targetSourceFile is specified,
+         * it is assumed that that file is handled from affected file list. If targetSourceFile is not specified,
+         * it will only emit all the affected files instead of whole program
+         *
+         * The first of writeFile if provided, writeFile of BuilderProgramHost if provided, writeFile of compiler host
+         * in that order would be used to write the files
+         */
+        emit(targetSourceFile?: SourceFile, writeFile?: WriteFileCallback, cancellationToken?: CancellationToken, emitOnlyDtsFiles?: boolean, customTransformers?: CustomTransformers): EmitResult;
+        /**
+         * Get the current directory of the program
+         */
+        getCurrentDirectory(): string;
+    }
+    /**
+     * The builder that caches the semantic diagnostics for the program and handles the changed files and affected files
+     */
+    interface SemanticDiagnosticsBuilderProgram extends BuilderProgram {
+        /**
+         * Gets the semantic diagnostics from the program for the next affected file and caches it
+         * Returns undefined if the iteration is complete
+         */
+        getSemanticDiagnosticsOfNextAffectedFile(cancellationToken?: CancellationToken, ignoreSourceFile?: (sourceFile: SourceFile) => boolean): AffectedFileResult<ReadonlyArray<Diagnostic>>;
+    }
+    /**
+     * The builder that can handle the changes in program and iterate through changed file to emit the files
+     * The semantic diagnostics are cached per file and managed by clearing for the changed/affected files
+     */
+    interface EmitAndSemanticDiagnosticsBuilderProgram extends BuilderProgram {
+        /**
+         * Emits the next affected file's emit result (EmitResult and sourceFiles emitted) or returns undefined if iteration is complete
+         * The first of writeFile if provided, writeFile of BuilderProgramHost if provided, writeFile of compiler host
+         * in that order would be used to write the files
+         */
+        emitNextAffectedFile(writeFile?: WriteFileCallback, cancellationToken?: CancellationToken, emitOnlyDtsFiles?: boolean, customTransformers?: CustomTransformers): AffectedFileResult<EmitResult>;
+    }
+    /**
+     * Create the builder to manage semantic diagnostics and cache them
+     */
+    function createSemanticDiagnosticsBuilderProgram(newProgram: Program, host: BuilderProgramHost, oldProgram?: SemanticDiagnosticsBuilderProgram, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>): SemanticDiagnosticsBuilderProgram;
+    function createSemanticDiagnosticsBuilderProgram(rootNames: ReadonlyArray<string> | undefined, options: CompilerOptions | undefined, host?: CompilerHost, oldProgram?: SemanticDiagnosticsBuilderProgram, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>): SemanticDiagnosticsBuilderProgram;
+    /**
+     * Create the builder that can handle the changes in program and iterate through changed files
+     * to emit the those files and manage semantic diagnostics cache as well
+     */
+    function createEmitAndSemanticDiagnosticsBuilderProgram(newProgram: Program, host: BuilderProgramHost, oldProgram?: EmitAndSemanticDiagnosticsBuilderProgram, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>): EmitAndSemanticDiagnosticsBuilderProgram;
+    function createEmitAndSemanticDiagnosticsBuilderProgram(rootNames: ReadonlyArray<string> | undefined, options: CompilerOptions | undefined, host?: CompilerHost, oldProgram?: EmitAndSemanticDiagnosticsBuilderProgram, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>): EmitAndSemanticDiagnosticsBuilderProgram;
+    /**
+     * Creates a builder thats just abstraction over program and can be used with watch
+     */
+    function createAbstractBuilder(newProgram: Program, host: BuilderProgramHost, oldProgram?: BuilderProgram, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>): BuilderProgram;
+    function createAbstractBuilder(rootNames: ReadonlyArray<string> | undefined, options: CompilerOptions | undefined, host?: CompilerHost, oldProgram?: BuilderProgram, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>): BuilderProgram;
+}
+declare namespace ts {
+    /** This is the cache of module/typedirectives resolution that can be retained across program */
+    interface ResolutionCache {
+        startRecordingFilesWithChangedResolutions(): void;
+        finishRecordingFilesWithChangedResolutions(): Path[] | undefined;
+        resolveModuleNames(moduleNames: string[], containingFile: string, reusedNames: string[] | undefined): ResolvedModuleFull[];
+        getResolvedModuleWithFailedLookupLocationsFromCache(moduleName: string, containingFile: string): CachedResolvedModuleWithFailedLookupLocations | undefined;
+        resolveTypeReferenceDirectives(typeDirectiveNames: string[], containingFile: string): ResolvedTypeReferenceDirective[];
+        invalidateResolutionOfFile(filePath: Path): void;
+        removeResolutionsOfFile(filePath: Path): void;
+        setFilesWithInvalidatedNonRelativeUnresolvedImports(filesWithUnresolvedImports: Map<ReadonlyArray<string>>): void;
+        createHasInvalidatedResolution(forceAllFilesAsInvalidated?: boolean): HasInvalidatedResolution;
+        startCachingPerDirectoryResolution(): void;
+        finishCachingPerDirectoryResolution(): void;
+        updateTypeRootsWatch(): void;
+        closeTypeRootsWatch(): void;
+        clear(): void;
+    }
+    interface ResolutionWithFailedLookupLocations {
+        readonly failedLookupLocations: ReadonlyArray<string>;
+        isInvalidated?: boolean;
+        refCount?: number;
+    }
+    interface CachedResolvedModuleWithFailedLookupLocations extends ResolvedModuleWithFailedLookupLocations, ResolutionWithFailedLookupLocations {
+    }
+    interface ResolutionCacheHost extends ModuleResolutionHost {
+        toPath(fileName: string): Path;
+        getCanonicalFileName: GetCanonicalFileName;
+        getCompilationSettings(): CompilerOptions;
+        watchDirectoryOfFailedLookupLocation(directory: string, cb: DirectoryWatcherCallback, flags: WatchDirectoryFlags): FileWatcher;
+        onInvalidatedResolution(): void;
+        watchTypeRootsDirectory(directory: string, cb: DirectoryWatcherCallback, flags: WatchDirectoryFlags): FileWatcher;
+        onChangedAutomaticTypeDirectiveNames(): void;
+        getCachedDirectoryStructureHost(): CachedDirectoryStructureHost | undefined;
+        projectName?: string;
+        getGlobalCache?(): string | undefined;
+        writeLog(s: string): void;
+        maxNumberOfFilesToIterateForInvalidation?: number;
+        getCurrentProgram(): Program;
+    }
+    const maxNumberOfFilesToIterateForInvalidation = 256;
+    function createResolutionCache(resolutionHost: ResolutionCacheHost, rootDirForResolution: string | undefined, logChangesWhenResolvingModule: boolean): ResolutionCache;
+}
+declare namespace ts.moduleSpecifiers {
+    interface ModuleSpecifierPreferences {
+        importModuleSpecifierPreference?: "relative" | "non-relative";
+    }
+    function getModuleSpecifier(compilerOptions: CompilerOptions, fromSourceFile: SourceFile, fromSourceFileName: string, toFileName: string, host: ModuleSpecifierResolutionHost, preferences?: ModuleSpecifierPreferences): string;
+    function getModuleSpecifiers(moduleSymbol: Symbol, program: Program, importingSourceFile: SourceFile, host: ModuleSpecifierResolutionHost, preferences: ModuleSpecifierPreferences): ReadonlyArray<ReadonlyArray<string>>;
+}
+declare namespace ts {
+    /**
+     * Create a function that reports error by writing to the system and handles the formating of the diagnostic
+     */
+    function createDiagnosticReporter(system: System, pretty?: boolean): DiagnosticReporter;
+    /** @internal */
+    const nonClearingMessageCodes: number[];
+    /** @internal */
+    const screenStartingMessageCodes: number[];
+    /**
+     * Create a function that reports watch status by writing to the system and handles the formating of the diagnostic
+     */
+    function createWatchStatusReporter(system: System, pretty?: boolean): WatchStatusReporter;
+    /** Parses config file using System interface */
+    function parseConfigFileWithSystem(configFileName: string, optionsToExtend: CompilerOptions, system: System, reportDiagnostic: DiagnosticReporter): ParsedCommandLine | undefined;
+    /**
+     * Program structure needed to emit the files and report diagnostics
+     */
+    interface ProgramToEmitFilesAndReportErrors {
+        getCurrentDirectory(): string;
+        getCompilerOptions(): CompilerOptions;
+        getSourceFiles(): ReadonlyArray<SourceFile>;
+        getSyntacticDiagnostics(): ReadonlyArray<Diagnostic>;
+        getOptionsDiagnostics(): ReadonlyArray<Diagnostic>;
+        getGlobalDiagnostics(): ReadonlyArray<Diagnostic>;
+        getSemanticDiagnostics(): ReadonlyArray<Diagnostic>;
+        getConfigFileParsingDiagnostics(): ReadonlyArray<Diagnostic>;
+        emit(): EmitResult;
+    }
+    type ReportEmitErrorSummary = (errorCount: number) => void;
+    /**
+     * Helper that emit files, report diagnostics and lists emitted and/or source files depending on compiler options
+     */
+    function emitFilesAndReportErrors(program: ProgramToEmitFilesAndReportErrors, reportDiagnostic: DiagnosticReporter, writeFileName?: (s: string) => void, reportSummary?: ReportEmitErrorSummary): ExitStatus;
+    /**
+     * Creates the watch compiler host from system for config file in watch mode
+     */
+    function createWatchCompilerHostOfConfigFile<T extends BuilderProgram = EmitAndSemanticDiagnosticsBuilderProgram>(configFileName: string, optionsToExtend: CompilerOptions | undefined, system: System, createProgram?: CreateProgram<T>, reportDiagnostic?: DiagnosticReporter, reportWatchStatus?: WatchStatusReporter): WatchCompilerHostOfConfigFile<T>;
+    /**
+     * Creates the watch compiler host from system for compiling root files and options in watch mode
+     */
+    function createWatchCompilerHostOfFilesAndCompilerOptions<T extends BuilderProgram = EmitAndSemanticDiagnosticsBuilderProgram>(rootFiles: string[], options: CompilerOptions, system: System, createProgram?: CreateProgram<T>, reportDiagnostic?: DiagnosticReporter, reportWatchStatus?: WatchStatusReporter): WatchCompilerHostOfFilesAndCompilerOptions<T>;
+}
+declare namespace ts {
+    type WatchStatusReporter = (diagnostic: Diagnostic, newLine: string, options: CompilerOptions) => void;
+    /** Create the program with rootNames and options, if they are undefined, oldProgram and new configFile diagnostics create new program */
+    type CreateProgram<T extends BuilderProgram> = (rootNames: ReadonlyArray<string> | undefined, options: CompilerOptions | undefined, host?: CompilerHost, oldProgram?: T, configFileParsingDiagnostics?: ReadonlyArray<Diagnostic>) => T;
+    interface WatchCompilerHost<T extends BuilderProgram> {
+        /**
+         * Used to create the program when need for program creation or recreation detected
+         */
+        createProgram: CreateProgram<T>;
+        /** If provided, callback to invoke after every new program creation */
+        afterProgramCreate?(program: T): void;
+        /** If provided, called with Diagnostic message that informs about change in watch status */
+        onWatchStatusChange?(diagnostic: Diagnostic, newLine: string, options: CompilerOptions): void;
+        maxNumberOfFilesToIterateForInvalidation?: number;
+        useCaseSensitiveFileNames(): boolean;
+        getNewLine(): string;
+        getCurrentDirectory(): string;
+        getDefaultLibFileName(options: CompilerOptions): string;
+        getDefaultLibLocation?(): string;
+        createHash?(data: string): string;
+        /**
+         * Use to check file presence for source files and
+         * if resolveModuleNames is not provided (complier is in charge of module resolution) then module files as well
+         */
+        fileExists(path: string): boolean;
+        /**
+         * Use to read file text for source files and
+         * if resolveModuleNames is not provided (complier is in charge of module resolution) then module files as well
+         */
+        readFile(path: string, encoding?: string): string | undefined;
+        /** If provided, used for module resolution as well as to handle directory structure */
+        directoryExists?(path: string): boolean;
+        /** If provided, used in resolutions as well as handling directory structure */
+        getDirectories?(path: string): string[];
+        /** If provided, used to cache and handle directory structure modifications */
+        readDirectory?(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
+        /** Symbol links resolution */
+        realpath?(path: string): string;
+        /** If provided would be used to write log about compilation */
+        trace?(s: string): void;
+        /** If provided is used to get the environment variable */
+        getEnvironmentVariable?(name: string): string | undefined;
+        /** If provided, used to resolve the module names, otherwise typescript's default module resolution */
+        resolveModuleNames?(moduleNames: string[], containingFile: string, reusedNames?: string[]): ResolvedModule[];
+        /** If provided, used to resolve type reference directives, otherwise typescript's default resolution */
+        resolveTypeReferenceDirectives?(typeReferenceDirectiveNames: string[], containingFile: string): ResolvedTypeReferenceDirective[];
+        /** Used to watch changes in source files, missing files needed to update the program or config file */
+        watchFile(path: string, callback: FileWatcherCallback, pollingInterval?: number): FileWatcher;
+        /** Used to watch resolved module's failed lookup locations, config file specs, type roots where auto type reference directives are added */
+        watchDirectory(path: string, callback: DirectoryWatcherCallback, recursive?: boolean): FileWatcher;
+        /** If provided, will be used to set delayed compilation, so that multiple changes in short span are compiled together */
+        setTimeout?(callback: (...args: any[]) => void, ms: number, ...args: any[]): any;
+        /** If provided, will be used to reset existing delayed compilation */
+        clearTimeout?(timeoutId: any): void;
+    }
+    /** Internal interface used to wire emit through same host */
+    interface WatchCompilerHost<T extends BuilderProgram> {
+        createDirectory?(path: string): void;
+        writeFile?(path: string, data: string, writeByteOrderMark?: boolean): void;
+        onCachedDirectoryStructureHostCreate?(host: CachedDirectoryStructureHost): void;
+    }
+    /**
+     * Host to create watch with root files and options
+     */
+    interface WatchCompilerHostOfFilesAndCompilerOptions<T extends BuilderProgram> extends WatchCompilerHost<T> {
+        /** root files to use to generate program */
+        rootFiles: string[];
+        /** Compiler options */
+        options: CompilerOptions;
+    }
+    /**
+     * Host to create watch with config file
+     */
+    interface WatchCompilerHostOfConfigFile<T extends BuilderProgram> extends WatchCompilerHost<T>, ConfigFileDiagnosticsReporter {
+        /** Name of the config file to compile */
+        configFileName: string;
+        /** Options to extend */
+        optionsToExtend?: CompilerOptions;
+        /**
+         * Used to generate source file names from the config file and its include, exclude, files rules
+         * and also to cache the directory stucture
+         */
+        readDirectory(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
+    }
+    /**
+     * Host to create watch with config file that is already parsed (from tsc)
+     */
+    interface WatchCompilerHostOfConfigFile<T extends BuilderProgram> extends WatchCompilerHost<T> {
+        optionsToExtend?: CompilerOptions;
+        configFileParsingResult?: ParsedCommandLine;
+    }
+    interface Watch<T> {
+        /** Synchronize with host and get updated program */
+        getProgram(): T;
+        /** Gets the existing program without synchronizing with changes on host */
+        getCurrentProgram(): T;
+    }
+    /**
+     * Creates the watch what generates program using the config file
+     */
+    interface WatchOfConfigFile<T> extends Watch<T> {
+    }
+    /**
+     * Creates the watch that generates program using the root files and compiler options
+     */
+    interface WatchOfFilesAndCompilerOptions<T> extends Watch<T> {
+        /** Updates the root files in the program, only if this is not config file compilation */
+        updateRootFileNames(fileNames: string[]): void;
+    }
+    /**
+     * Create the watch compiler host for either configFile or fileNames and its options
+     */
+    function createWatchCompilerHost<T extends BuilderProgram>(rootFiles: string[], options: CompilerOptions, system: System, createProgram?: CreateProgram<T>, reportDiagnostic?: DiagnosticReporter, reportWatchStatus?: WatchStatusReporter): WatchCompilerHostOfFilesAndCompilerOptions<T>;
+    function createWatchCompilerHost<T extends BuilderProgram>(configFileName: string, optionsToExtend: CompilerOptions | undefined, system: System, createProgram?: CreateProgram<T>, reportDiagnostic?: DiagnosticReporter, reportWatchStatus?: WatchStatusReporter): WatchCompilerHostOfConfigFile<T>;
+    /**
+     * Creates the watch from the host for root files and compiler options
+     */
+    function createWatchProgram<T extends BuilderProgram>(host: WatchCompilerHostOfFilesAndCompilerOptions<T>): WatchOfFilesAndCompilerOptions<T>;
+    /**
+     * Creates the watch from the host for config file
+     */
+    function createWatchProgram<T extends BuilderProgram>(host: WatchCompilerHostOfConfigFile<T>): WatchOfConfigFile<T>;
+}
+declare namespace ts {
+    /**
+     * Branded string for keeping track of when we've turned an ambiguous path
+     * specified like "./blah" to an absolute path to an actual
+     * tsconfig file, e.g. "/root/blah/tsconfig.json"
+     */
+    type ResolvedConfigFileName = string & {
+        _isResolvedConfigFileName: never;
+    };
+    interface BuildHost {
+        verbose(diag: DiagnosticMessage, ...args: string[]): void;
+        error(diag: DiagnosticMessage, ...args: string[]): void;
+        errorDiagnostic(diag: Diagnostic): void;
+        message(diag: DiagnosticMessage, ...args: string[]): void;
+    }
+    /**
+     * A BuildContext tracks what's going on during the course of a build.
+     *
+     * Callers may invoke any number of build requests within the same context;
+     * until the context is reset, each project will only be built at most once.
+     *
+     * Example: In a standard setup where project B depends on project A, and both are out of date,
+     * a failed build of A will result in A remaining out of date. When we try to build
+     * B, we should immediately bail instead of recomputing A's up-to-date status again.
+     *
+     * This also matters for performing fast (i.e. fake) downstream builds of projects
+     * when their upstream .d.ts files haven't changed content (but have newer timestamps)
+     */
+    interface BuildContext {
+        options: BuildOptions;
+        /**
+         * Map from output file name to its pre-build timestamp
+         */
+        unchangedOutputs: FileMap<Date>;
+        /**
+         * Map from config file name to up-to-date status
+         */
+        projectStatus: FileMap<UpToDateStatus>;
+        invalidatedProjects: FileMap<true>;
+        queuedProjects: FileMap<true>;
+        missingRoots: Map<true>;
+    }
+    type Mapper = ReturnType<typeof createDependencyMapper>;
+    interface DependencyGraph {
+        buildQueue: ResolvedConfigFileName[];
+        dependencyMap: Mapper;
+    }
+    interface BuildOptions {
+        dry: boolean;
+        force: boolean;
+        verbose: boolean;
+    }
+    enum UpToDateStatusType {
+        Unbuildable = 0,
+        UpToDate = 1,
+        /**
+         * The project appears out of date because its upstream inputs are newer than its outputs,
+         * but all of its outputs are actually newer than the previous identical outputs of its (.d.ts) inputs.
+         * This means we can Pseudo-build (just touch timestamps), as if we had actually built this project.
+         */
+        UpToDateWithUpstreamTypes = 2,
+        OutputMissing = 3,
+        OutOfDateWithSelf = 4,
+        OutOfDateWithUpstream = 5,
+        UpstreamOutOfDate = 6,
+        UpstreamBlocked = 7,
+        /**
+         * Projects with no outputs (i.e. "solution" files)
+         */
+        ContainerOnly = 8
+    }
+    type UpToDateStatus = Status.Unbuildable | Status.UpToDate | Status.OutputMissing | Status.OutOfDateWithSelf | Status.OutOfDateWithUpstream | Status.UpstreamOutOfDate | Status.UpstreamBlocked | Status.ContainerOnly;
+    namespace Status {
+        /**
+         * The project can't be built at all in its current state. For example,
+         * its config file cannot be parsed, or it has a syntax error or missing file
+         */
+        interface Unbuildable {
+            type: UpToDateStatusType.Unbuildable;
+            reason: string;
+        }
+        /**
+         * This project doesn't have any outputs, so "is it up to date" is a meaningless question.
+         */
+        interface ContainerOnly {
+            type: UpToDateStatusType.ContainerOnly;
+        }
+        /**
+         * The project is up to date with respect to its inputs.
+         * We track what the newest input file is.
+         */
+        interface UpToDate {
+            type: UpToDateStatusType.UpToDate | UpToDateStatusType.UpToDateWithUpstreamTypes;
+            newestInputFileTime: Date;
+            newestInputFileName: string;
+            newestDeclarationFileContentChangedTime: Date;
+            newestOutputFileTime: Date;
+            newestOutputFileName: string;
+            oldestOutputFileName: string;
+        }
+        /**
+         * One or more of the outputs of the project does not exist.
+         */
+        interface OutputMissing {
+            type: UpToDateStatusType.OutputMissing;
+            /**
+             * The name of the first output file that didn't exist
+             */
+            missingOutputFileName: string;
+        }
+        /**
+         * One or more of the project's outputs is older than its newest input.
+         */
+        interface OutOfDateWithSelf {
+            type: UpToDateStatusType.OutOfDateWithSelf;
+            outOfDateOutputFileName: string;
+            newerInputFileName: string;
+        }
+        /**
+         * This project depends on an out-of-date project, so shouldn't be built yet
+         */
+        interface UpstreamOutOfDate {
+            type: UpToDateStatusType.UpstreamOutOfDate;
+            upstreamProjectName: string;
+        }
+        /**
+         * This project depends an upstream project with build errors
+         */
+        interface UpstreamBlocked {
+            type: UpToDateStatusType.UpstreamBlocked;
+            upstreamProjectName: string;
+        }
+        /**
+         * One or more of the project's outputs is older than the newest output of
+         * an upstream project.
+         */
+        interface OutOfDateWithUpstream {
+            type: UpToDateStatusType.OutOfDateWithUpstream;
+            outOfDateOutputFileName: string;
+            newerProjectName: string;
+        }
+    }
+    interface FileMap<T> {
+        setValue(fileName: string, value: T): void;
+        getValue(fileName: string): T | never;
+        getValueOrUndefined(fileName: string): T | undefined;
+        hasKey(fileName: string): boolean;
+        removeKey(fileName: string): void;
+        getKeys(): string[];
+    }
+    function createDependencyMapper(): {
+        addReference: (childConfigFileName: ResolvedConfigFileName, parentConfigFileName: ResolvedConfigFileName) => void;
+        getReferencesTo: (parentConfigFileName: ResolvedConfigFileName) => ResolvedConfigFileName[];
+        getReferencesOf: (childConfigFileName: ResolvedConfigFileName) => ResolvedConfigFileName[];
+        getKeys: () => ReadonlyArray<ResolvedConfigFileName>;
+    };
+    function createBuildContext(options: BuildOptions): BuildContext;
+    function performBuild(args: string[], compilerHost: CompilerHost, buildHost: BuildHost, system?: System): void;
+    /**
+     * A SolutionBuilder has an immutable set of rootNames that are the "entry point" projects, but
+     * can dynamically add/remove other projects based on changes on the rootNames' references
+     */
+    function createSolutionBuilder(compilerHost: CompilerHost, buildHost: BuildHost, rootNames: ReadonlyArray<string>, defaultOptions: BuildOptions, system?: System): {
+        buildAllProjects: () => void;
+        getUpToDateStatus: (project: ParsedCommandLine | undefined) => UpToDateStatus;
+        getUpToDateStatusOfFile: (configFileName: ResolvedConfigFileName) => UpToDateStatus;
+        cleanAllProjects: () => void;
+        resetBuildContext: (opts?: BuildOptions) => void;
+        getBuildGraph: (configFileNames: ReadonlyArray<string>) => DependencyGraph | undefined;
+        invalidateProject: (configFileName: string) => void;
+        buildInvalidatedProjects: () => void;
+        buildDependentInvalidatedProjects: () => void;
+        resolveProjectName: (name: string) => ResolvedConfigFileName | undefined;
+        startWatching: () => void;
+    };
+}
+//# sourceMappingURL=compiler.d.ts.map
+declare namespace ts {
+    interface Node {
+        getSourceFile(): SourceFile;
+        getChildCount(sourceFile?: SourceFile): number;
+        getChildAt(index: number, sourceFile?: SourceFile): Node;
+        getChildren(sourceFile?: SourceFile): Node[];
+        getChildren(sourceFile?: SourceFileLike): Node[];
+        getStart(sourceFile?: SourceFile, includeJsDocComment?: boolean): number;
+        getStart(sourceFile?: SourceFileLike, includeJsDocComment?: boolean): number;
+        getFullStart(): number;
+        getEnd(): number;
+        getWidth(sourceFile?: SourceFileLike): number;
+        getFullWidth(): number;
+        getLeadingTriviaWidth(sourceFile?: SourceFile): number;
+        getFullText(sourceFile?: SourceFile): string;
+        getText(sourceFile?: SourceFile): string;
+        getFirstToken(sourceFile?: SourceFile): Node | undefined;
+        getLastToken(sourceFile?: SourceFile): Node | undefined;
+        forEachChild<T>(cbNode: (node: Node) => T | undefined, cbNodeArray?: (nodes: NodeArray<Node>) => T | undefined): T | undefined;
+    }
+    interface Identifier {
+        readonly text: string;
+    }
+    interface Symbol {
+        readonly name: string;
+        getFlags(): SymbolFlags;
+        getEscapedName(): __String;
+        getName(): string;
+        getDeclarations(): Declaration[] | undefined;
+        getDocumentationComment(typeChecker: TypeChecker | undefined): SymbolDisplayPart[];
+        getJsDocTags(): JSDocTagInfo[];
+    }
+    interface Type {
+        getFlags(): TypeFlags;
+        getSymbol(): Symbol | undefined;
+        getProperties(): Symbol[];
+        getProperty(propertyName: string): Symbol | undefined;
+        getApparentProperties(): Symbol[];
+        getCallSignatures(): Signature[];
+        getConstructSignatures(): Signature[];
+        getStringIndexType(): Type | undefined;
+        getNumberIndexType(): Type | undefined;
+        getBaseTypes(): BaseType[] | undefined;
+        getNonNullableType(): Type;
+        getConstraint(): Type | undefined;
+        getDefault(): Type | undefined;
+        isUnion(): this is UnionType;
+        isIntersection(): this is IntersectionType;
+        isUnionOrIntersection(): this is UnionOrIntersectionType;
+        isLiteral(): this is LiteralType;
+        isStringLiteral(): this is StringLiteralType;
+        isNumberLiteral(): this is NumberLiteralType;
+        isTypeParameter(): this is TypeParameter;
+        isClassOrInterface(): this is InterfaceType;
+        isClass(): this is InterfaceType;
+    }
+    interface Signature {
+        getDeclaration(): SignatureDeclaration;
+        getTypeParameters(): TypeParameter[] | undefined;
+        getParameters(): Symbol[];
+        getReturnType(): Type;
+        getDocumentationComment(typeChecker: TypeChecker | undefined): SymbolDisplayPart[];
+        getJsDocTags(): JSDocTagInfo[];
+    }
+    interface SourceFile {
+        version: string;
+        scriptSnapshot: IScriptSnapshot | undefined;
+        nameTable: UnderscoreEscapedMap<number> | undefined;
+        getNamedDeclarations(): Map<Declaration[]>;
+        getLineAndCharacterOfPosition(pos: number): LineAndCharacter;
+        getLineEndOfPosition(pos: number): number;
+        getLineStarts(): ReadonlyArray<number>;
+        getPositionOfLineAndCharacter(line: number, character: number): number;
+        update(newText: string, textChangeRange: TextChangeRange): SourceFile;
+        sourceMapper?: sourcemaps.SourceMapper;
+    }
+    interface SourceFileLike {
+        getLineAndCharacterOfPosition(pos: number): LineAndCharacter;
+        sourceMapper?: sourcemaps.SourceMapper;
+    }
+    interface SourceMapSource {
+        getLineAndCharacterOfPosition(pos: number): LineAndCharacter;
+    }
+    /**
+     * Represents an immutable snapshot of a script at a specified time.Once acquired, the
+     * snapshot is observably immutable. i.e. the same calls with the same parameters will return
+     * the same values.
+     */
+    interface IScriptSnapshot {
+        /** Gets a portion of the script snapshot specified by [start, end). */
+        getText(start: number, end: number): string;
+        /** Gets the length of this script snapshot. */
+        getLength(): number;
+        /**
+         * Gets the TextChangeRange that describe how the text changed between this text and
+         * an older version.  This information is used by the incremental parser to determine
+         * what sections of the script need to be re-parsed.  'undefined' can be returned if the
+         * change range cannot be determined.  However, in that case, incremental parsing will
+         * not happen and the entire document will be re - parsed.
+         */
+        getChangeRange(oldSnapshot: IScriptSnapshot): TextChangeRange | undefined;
+        /** Releases all resources held by this script snapshot */
+        dispose?(): void;
+    }
+    namespace ScriptSnapshot {
+        function fromString(text: string): IScriptSnapshot;
+    }
+    interface PreProcessedFileInfo {
+        referencedFiles: FileReference[];
+        typeReferenceDirectives: FileReference[];
+        libReferenceDirectives: FileReference[];
+        importedFiles: FileReference[];
+        ambientExternalModules?: string[];
+        isLibFile: boolean;
+    }
+    interface HostCancellationToken {
+        isCancellationRequested(): boolean;
+    }
+    interface InstallPackageOptions {
+        fileName: Path;
+        packageName: string;
+    }
+    interface LanguageServiceHost extends GetEffectiveTypeRootsHost {
+        getCompilationSettings(): CompilerOptions;
+        getNewLine?(): string;
+        getProjectVersion?(): string;
+        getScriptFileNames(): string[];
+        getScriptKind?(fileName: string): ScriptKind;
+        getScriptVersion(fileName: string): string;
+        getScriptSnapshot(fileName: string): IScriptSnapshot | undefined;
+        getProjectReferences?(): ReadonlyArray<ProjectReference> | undefined;
+        getLocalizedDiagnosticMessages?(): any;
+        getCancellationToken?(): HostCancellationToken;
+        getCurrentDirectory(): string;
+        getDefaultLibFileName(options: CompilerOptions): string;
+        log?(s: string): void;
+        trace?(s: string): void;
+        error?(s: string): void;
+        useCaseSensitiveFileNames?(): boolean;
+        readDirectory?(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
+        readFile?(path: string, encoding?: string): string | undefined;
+        realpath?(path: string): string;
+        fileExists?(path: string): boolean;
+        getTypeRootsVersion?(): number;
+        resolveModuleNames?(moduleNames: string[], containingFile: string, reusedNames?: string[]): ResolvedModule[];
+        getResolvedModuleWithFailedLookupLocationsFromCache?(modulename: string, containingFile: string): ResolvedModuleWithFailedLookupLocations | undefined;
+        resolveTypeReferenceDirectives?(typeDirectiveNames: string[], containingFile: string): ResolvedTypeReferenceDirective[];
+        hasInvalidatedResolution?: HasInvalidatedResolution;
+        hasChangedAutomaticTypeDirectiveNames?: boolean;
+        getDirectories?(directoryName: string): string[];
+        /**
+         * Gets a set of custom transformers to use during emit.
+         */
+        getCustomTransformers?(): CustomTransformers | undefined;
+        isKnownTypesPackageName?(name: string): boolean;
+        installPackage?(options: InstallPackageOptions): Promise<ApplyCodeActionCommandResult>;
+    }
+    interface UserPreferences {
+        readonly disableSuggestions?: boolean;
+        readonly quotePreference?: "double" | "single";
+        readonly includeCompletionsForModuleExports?: boolean;
+        readonly includeCompletionsWithInsertText?: boolean;
+        readonly importModuleSpecifierPreference?: "relative" | "non-relative";
+        readonly allowTextChangesInNewFiles?: boolean;
+    }
+    const defaultPreferences: UserPreferences;
+    interface LanguageService {
+        cleanupSemanticCache(): void;
+        getSyntacticDiagnostics(fileName: string): DiagnosticWithLocation[];
+        /** The first time this is called, it will return global diagnostics (no location). */
+        getSemanticDiagnostics(fileName: string): Diagnostic[];
+        getSuggestionDiagnostics(fileName: string): DiagnosticWithLocation[];
+        getCompilerOptionsDiagnostics(): Diagnostic[];
+        /**
+         * @deprecated Use getEncodedSyntacticClassifications instead.
+         */
+        getSyntacticClassifications(fileName: string, span: TextSpan): ClassifiedSpan[];
+        /**
+         * @deprecated Use getEncodedSemanticClassifications instead.
+         */
+        getSemanticClassifications(fileName: string, span: TextSpan): ClassifiedSpan[];
+        getEncodedSyntacticClassifications(fileName: string, span: TextSpan): Classifications;
+        getEncodedSemanticClassifications(fileName: string, span: TextSpan): Classifications;
+        getCompletionsAtPosition(fileName: string, position: number, options: GetCompletionsAtPositionOptions | undefined): CompletionInfo | undefined;
+        getCompletionEntryDetails(fileName: string, position: number, name: string, formatOptions: FormatCodeOptions | FormatCodeSettings | undefined, source: string | undefined, preferences: UserPreferences | undefined): CompletionEntryDetails | undefined;
+        getCompletionEntrySymbol(fileName: string, position: number, name: string, source: string | undefined): Symbol | undefined;
+        getQuickInfoAtPosition(fileName: string, position: number): QuickInfo | undefined;
+        getNameOrDottedNameSpan(fileName: string, startPos: number, endPos: number): TextSpan | undefined;
+        getBreakpointStatementAtPosition(fileName: string, position: number): TextSpan | undefined;
+        getSignatureHelpItems(fileName: string, position: number): SignatureHelpItems | undefined;
+        getRenameInfo(fileName: string, position: number): RenameInfo;
+        findRenameLocations(fileName: string, position: number, findInStrings: boolean, findInComments: boolean): RenameLocation[] | undefined;
+        getDefinitionAtPosition(fileName: string, position: number): DefinitionInfo[] | undefined;
+        getDefinitionAndBoundSpan(fileName: string, position: number): DefinitionInfoAndBoundSpan | undefined;
+        getTypeDefinitionAtPosition(fileName: string, position: number): DefinitionInfo[] | undefined;
+        getImplementationAtPosition(fileName: string, position: number): ImplementationLocation[] | undefined;
+        getReferencesAtPosition(fileName: string, position: number): ReferenceEntry[] | undefined;
+        findReferences(fileName: string, position: number): ReferencedSymbol[] | undefined;
+        getDocumentHighlights(fileName: string, position: number, filesToSearch: string[]): DocumentHighlights[] | undefined;
+        /** @deprecated */
+        getOccurrencesAtPosition(fileName: string, position: number): ReferenceEntry[] | undefined;
+        getNavigateToItems(searchValue: string, maxResultCount?: number, fileName?: string, excludeDtsFiles?: boolean): NavigateToItem[];
+        getNavigationBarItems(fileName: string): NavigationBarItem[];
+        getNavigationTree(fileName: string): NavigationTree;
+        getOutliningSpans(fileName: string): OutliningSpan[];
+        getTodoComments(fileName: string, descriptors: TodoCommentDescriptor[]): TodoComment[];
+        getBraceMatchingAtPosition(fileName: string, position: number): TextSpan[];
+        getIndentationAtPosition(fileName: string, position: number, options: EditorOptions | EditorSettings): number;
+        getFormattingEditsForRange(fileName: string, start: number, end: number, options: FormatCodeOptions | FormatCodeSettings): TextChange[];
+        getFormattingEditsForDocument(fileName: string, options: FormatCodeOptions | FormatCodeSettings): TextChange[];
+        getFormattingEditsAfterKeystroke(fileName: string, position: number, key: string, options: FormatCodeOptions | FormatCodeSettings): TextChange[];
+        getDocCommentTemplateAtPosition(fileName: string, position: number): TextInsertion | undefined;
+        isValidBraceCompletionAtPosition(fileName: string, position: number, openingBrace: number): boolean;
+        /**
+         * This will return a defined result if the position is after the `>` of the opening tag, or somewhere in the text, of a JSXElement with no closing tag.
+         * Editors should call this after `>` is typed.
+         */
+        getJsxClosingTagAtPosition(fileName: string, position: number): JsxClosingTagInfo | undefined;
+        getSpanOfEnclosingComment(fileName: string, position: number, onlyMultiLine: boolean): TextSpan | undefined;
+        toLineColumnOffset?(fileName: string, position: number): LineAndCharacter;
+        getCodeFixesAtPosition(fileName: string, start: number, end: number, errorCodes: ReadonlyArray<number>, formatOptions: FormatCodeSettings, preferences: UserPreferences): ReadonlyArray<CodeFixAction>;
+        getCombinedCodeFix(scope: CombinedCodeFixScope, fixId: {}, formatOptions: FormatCodeSettings, preferences: UserPreferences): CombinedCodeActions;
+        applyCodeActionCommand(action: CodeActionCommand): Promise<ApplyCodeActionCommandResult>;
+        applyCodeActionCommand(action: CodeActionCommand[]): Promise<ApplyCodeActionCommandResult[]>;
+        applyCodeActionCommand(action: CodeActionCommand | CodeActionCommand[]): Promise<ApplyCodeActionCommandResult | ApplyCodeActionCommandResult[]>;
+        /** @deprecated `fileName` will be ignored */
+        applyCodeActionCommand(fileName: string, action: CodeActionCommand): Promise<ApplyCodeActionCommandResult>;
+        /** @deprecated `fileName` will be ignored */
+        applyCodeActionCommand(fileName: string, action: CodeActionCommand[]): Promise<ApplyCodeActionCommandResult[]>;
+        /** @deprecated `fileName` will be ignored */
+        applyCodeActionCommand(fileName: string, action: CodeActionCommand | CodeActionCommand[]): Promise<ApplyCodeActionCommandResult | ApplyCodeActionCommandResult[]>;
+        getApplicableRefactors(fileName: string, positionOrRange: number | TextRange, preferences: UserPreferences | undefined): ApplicableRefactorInfo[];
+        getEditsForRefactor(fileName: string, formatOptions: FormatCodeSettings, positionOrRange: number | TextRange, refactorName: string, actionName: string, preferences: UserPreferences | undefined): RefactorEditInfo | undefined;
+        organizeImports(scope: OrganizeImportsScope, formatOptions: FormatCodeSettings, preferences: UserPreferences | undefined): ReadonlyArray<FileTextChanges>;
+        getEditsForFileRename(oldFilePath: string, newFilePath: string, formatOptions: FormatCodeSettings, preferences: UserPreferences | undefined): ReadonlyArray<FileTextChanges>;
+        getEmitOutput(fileName: string, emitOnlyDtsFiles?: boolean): EmitOutput;
+        getProgram(): Program | undefined;
+        getNonBoundSourceFile(fileName: string): SourceFile;
+        dispose(): void;
+    }
+    interface JsxClosingTagInfo {
+        readonly newText: string;
+    }
+    interface CombinedCodeFixScope {
+        type: "file";
+        fileName: string;
+    }
+    type OrganizeImportsScope = CombinedCodeFixScope;
+    type CompletionsTriggerCharacter = "." | '"' | "'" | "`" | "/" | "@" | "<";
+    interface GetCompletionsAtPositionOptions extends UserPreferences {
+        /** If the editor is asking for completions because a certain character was typed, and not because the user explicitly requested them, this should be set. */
+        triggerCharacter?: CompletionsTriggerCharacter;
+        /** @deprecated Use includeCompletionsForModuleExports */
+        includeExternalModuleExports?: boolean;
+        /** @deprecated Use includeCompletionsWithInsertText */
+        includeInsertTextCompletions?: boolean;
+    }
+    interface ApplyCodeActionCommandResult {
+        successMessage: string;
+    }
+    interface Classifications {
+        spans: number[];
+        endOfLineState: EndOfLineState;
+    }
+    interface ClassifiedSpan {
+        textSpan: TextSpan;
+        classificationType: ClassificationTypeNames;
+    }
+    /**
+     * Navigation bar interface designed for visual studio's dual-column layout.
+     * This does not form a proper tree.
+     * The navbar is returned as a list of top-level items, each of which has a list of child items.
+     * Child items always have an empty array for their `childItems`.
+     */
+    interface NavigationBarItem {
+        text: string;
+        kind: ScriptElementKind;
+        kindModifiers: string;
+        spans: TextSpan[];
+        childItems: NavigationBarItem[];
+        indent: number;
+        bolded: boolean;
+        grayed: boolean;
+    }
+    /**
+     * Node in a tree of nested declarations in a file.
+     * The top node is always a script or module node.
+     */
+    interface NavigationTree {
+        /** Name of the declaration, or a short description, e.g. "<class>". */
+        text: string;
+        kind: ScriptElementKind;
+        /** ScriptElementKindModifier separated by commas, e.g. "public,abstract" */
+        kindModifiers: string;
+        /**
+         * Spans of the nodes that generated this declaration.
+         * There will be more than one if this is the result of merging.
+         */
+        spans: TextSpan[];
+        nameSpan: TextSpan | undefined;
+        /** Present if non-empty */
+        childItems?: NavigationTree[];
+    }
+    interface TodoCommentDescriptor {
+        text: string;
+        priority: number;
+    }
+    interface TodoComment {
+        descriptor: TodoCommentDescriptor;
+        message: string;
+        position: number;
+    }
+    class TextChange {
+        span: TextSpan;
+        newText: string;
+    }
+    interface FileTextChanges {
+        fileName: string;
+        textChanges: TextChange[];
+        isNewFile?: boolean;
+    }
+    interface CodeAction {
+        /** Description of the code action to display in the UI of the editor */
+        description: string;
+        /** Text changes to apply to each file as part of the code action */
+        changes: FileTextChanges[];
+        /**
+         * If the user accepts the code fix, the editor should send the action back in a `applyAction` request.
+         * This allows the language service to have side effects (e.g. installing dependencies) upon a code fix.
+         */
+        commands?: CodeActionCommand[];
+    }
+    interface CodeFixAction extends CodeAction {
+        /** Short name to identify the fix, for use by telemetry. */
+        fixName: string;
+        /**
+         * If present, one may call 'getCombinedCodeFix' with this fixId.
+         * This may be omitted to indicate that the code fix can't be applied in a group.
+         */
+        fixId?: {};
+        fixAllDescription?: string;
+    }
+    interface CombinedCodeActions {
+        changes: ReadonlyArray<FileTextChanges>;
+        commands?: ReadonlyArray<CodeActionCommand>;
+    }
+    type CodeActionCommand = InstallPackageAction;
+    interface InstallPackageAction {
+        file: string;
+        type: "install package";
+        packageName: string;
+    }
+    /**
+     * A set of one or more available refactoring actions, grouped under a parent refactoring.
+     */
+    interface ApplicableRefactorInfo {
+        /**
+         * The programmatic name of the refactoring
+         */
+        name: string;
+        /**
+         * A description of this refactoring category to show to the user.
+         * If the refactoring gets inlined (see below), this text will not be visible.
+         */
+        description: string;
+        /**
+         * Inlineable refactorings can have their actions hoisted out to the top level
+         * of a context menu. Non-inlineanable refactorings should always be shown inside
+         * their parent grouping.
+         *
+         * If not specified, this value is assumed to be 'true'
+         */
+        inlineable?: boolean;
+        actions: RefactorActionInfo[];
+    }
+    /**
+     * Represents a single refactoring action - for example, the "Extract Method..." refactor might
+     * offer several actions, each corresponding to a surround class or closure to extract into.
+     */
+    interface RefactorActionInfo {
+        /**
+         * The programmatic name of the refactoring action
+         */
+        name: string;
+        /**
+         * A description of this refactoring action to show to the user.
+         * If the parent refactoring is inlined away, this will be the only text shown,
+         * so this description should make sense by itself if the parent is inlineable=true
+         */
+        description: string;
+    }
+    /**
+     * A set of edits to make in response to a refactor action, plus an optional
+     * location where renaming should be invoked from
+     */
+    interface RefactorEditInfo {
+        edits: FileTextChanges[];
+        renameFilename?: string;
+        renameLocation?: number;
+        commands?: CodeActionCommand[];
+    }
+    interface TextInsertion {
+        newText: string;
+        /** The position in newText the caret should point to after the insertion. */
+        caretOffset: number;
+    }
+    interface DocumentSpan {
+        textSpan: TextSpan;
+        fileName: string;
+        /**
+         * If the span represents a location that was remapped (e.g. via a .d.ts.map file),
+         * then the original filename and span will be specified here
+         */
+        originalTextSpan?: TextSpan;
+        originalFileName?: string;
+    }
+    interface RenameLocation extends DocumentSpan {
+    }
+    interface ReferenceEntry extends DocumentSpan {
+        isWriteAccess: boolean;
+        isDefinition: boolean;
+        isInString?: true;
+    }
+    interface ImplementationLocation extends DocumentSpan {
+        kind: ScriptElementKind;
+        displayParts: SymbolDisplayPart[];
+    }
+    interface DocumentHighlights {
+        fileName: string;
+        highlightSpans: HighlightSpan[];
+    }
+    enum HighlightSpanKind {
+        none = "none",
+        definition = "definition",
+        reference = "reference",
+        writtenReference = "writtenReference"
+    }
+    interface HighlightSpan {
+        fileName?: string;
+        isInString?: true;
+        textSpan: TextSpan;
+        kind: HighlightSpanKind;
+    }
+    interface NavigateToItem {
+        name: string;
+        kind: ScriptElementKind;
+        kindModifiers: string;
+        matchKind: string;
+        isCaseSensitive: boolean;
+        fileName: string;
+        textSpan: TextSpan;
+        containerName: string;
+        containerKind: ScriptElementKind;
+    }
+    enum IndentStyle {
+        None = 0,
+        Block = 1,
+        Smart = 2
+    }
+    interface EditorOptions {
+        BaseIndentSize?: number;
+        IndentSize: number;
+        TabSize: number;
+        NewLineCharacter: string;
+        ConvertTabsToSpaces: boolean;
+        IndentStyle: IndentStyle;
+    }
+    interface EditorSettings {
+        baseIndentSize?: number;
+        indentSize?: number;
+        tabSize?: number;
+        newLineCharacter?: string;
+        convertTabsToSpaces?: boolean;
+        indentStyle?: IndentStyle;
+    }
+    interface FormatCodeOptions extends EditorOptions {
+        InsertSpaceAfterCommaDelimiter: boolean;
+        InsertSpaceAfterSemicolonInForStatements: boolean;
+        InsertSpaceBeforeAndAfterBinaryOperators: boolean;
+        InsertSpaceAfterConstructor?: boolean;
+        InsertSpaceAfterKeywordsInControlFlowStatements: boolean;
+        InsertSpaceAfterFunctionKeywordForAnonymousFunctions: boolean;
+        InsertSpaceAfterOpeningAndBeforeClosingNonemptyParenthesis: boolean;
+        InsertSpaceAfterOpeningAndBeforeClosingNonemptyBrackets: boolean;
+        InsertSpaceAfterOpeningAndBeforeClosingNonemptyBraces?: boolean;
+        InsertSpaceAfterOpeningAndBeforeClosingTemplateStringBraces: boolean;
+        InsertSpaceAfterOpeningAndBeforeClosingJsxExpressionBraces?: boolean;
+        InsertSpaceAfterTypeAssertion?: boolean;
+        InsertSpaceBeforeFunctionParenthesis?: boolean;
+        PlaceOpenBraceOnNewLineForFunctions: boolean;
+        PlaceOpenBraceOnNewLineForControlBlocks: boolean;
+        insertSpaceBeforeTypeAnnotation?: boolean;
+    }
+    interface FormatCodeSettings extends EditorSettings {
+        insertSpaceAfterCommaDelimiter?: boolean;
+        insertSpaceAfterSemicolonInForStatements?: boolean;
+        insertSpaceBeforeAndAfterBinaryOperators?: boolean;
+        insertSpaceAfterConstructor?: boolean;
+        insertSpaceAfterKeywordsInControlFlowStatements?: boolean;
+        insertSpaceAfterFunctionKeywordForAnonymousFunctions?: boolean;
+        insertSpaceAfterOpeningAndBeforeClosingNonemptyParenthesis?: boolean;
+        insertSpaceAfterOpeningAndBeforeClosingNonemptyBrackets?: boolean;
+        insertSpaceAfterOpeningAndBeforeClosingNonemptyBraces?: boolean;
+        insertSpaceAfterOpeningAndBeforeClosingTemplateStringBraces?: boolean;
+        insertSpaceAfterOpeningAndBeforeClosingJsxExpressionBraces?: boolean;
+        insertSpaceAfterTypeAssertion?: boolean;
+        insertSpaceBeforeFunctionParenthesis?: boolean;
+        placeOpenBraceOnNewLineForFunctions?: boolean;
+        placeOpenBraceOnNewLineForControlBlocks?: boolean;
+        insertSpaceBeforeTypeAnnotation?: boolean;
+        indentMultiLineObjectLiteralBeginningOnBlankLine?: boolean;
+    }
+    interface DefinitionInfo extends DocumentSpan {
+        kind: ScriptElementKind;
+        name: string;
+        containerKind: ScriptElementKind;
+        containerName: string;
+    }
+    interface DefinitionInfoAndBoundSpan {
+        definitions?: ReadonlyArray<DefinitionInfo>;
+        textSpan: TextSpan;
+    }
+    interface ReferencedSymbolDefinitionInfo extends DefinitionInfo {
+        displayParts: SymbolDisplayPart[];
+    }
+    interface ReferencedSymbol {
+        definition: ReferencedSymbolDefinitionInfo;
+        references: ReferenceEntry[];
+    }
+    enum SymbolDisplayPartKind {
+        aliasName = 0,
+        className = 1,
+        enumName = 2,
+        fieldName = 3,
+        interfaceName = 4,
+        keyword = 5,
+        lineBreak = 6,
+        numericLiteral = 7,
+        stringLiteral = 8,
+        localName = 9,
+        methodName = 10,
+        moduleName = 11,
+        operator = 12,
+        parameterName = 13,
+        propertyName = 14,
+        punctuation = 15,
+        space = 16,
+        text = 17,
+        typeParameterName = 18,
+        enumMemberName = 19,
+        functionName = 20,
+        regularExpressionLiteral = 21
+    }
+    interface SymbolDisplayPart {
+        text: string;
+        kind: string;
+    }
+    interface JSDocTagInfo {
+        name: string;
+        text?: string;
+    }
+    interface QuickInfo {
+        kind: ScriptElementKind;
+        kindModifiers: string;
+        textSpan: TextSpan;
+        displayParts?: SymbolDisplayPart[];
+        documentation?: SymbolDisplayPart[];
+        tags?: JSDocTagInfo[];
+    }
+    interface RenameInfo {
+        canRename: boolean;
+        localizedErrorMessage?: string;
+        displayName: string;
+        fullDisplayName: string;
+        kind: ScriptElementKind;
+        kindModifiers: string;
+        triggerSpan: TextSpan;
+    }
+    interface SignatureHelpParameter {
+        name: string;
+        documentation: SymbolDisplayPart[];
+        displayParts: SymbolDisplayPart[];
+        isOptional: boolean;
+    }
+    /**
+     * Represents a single signature to show in signature help.
+     * The id is used for subsequent calls into the language service to ask questions about the
+     * signature help item in the context of any documents that have been updated.  i.e. after
+     * an edit has happened, while signature help is still active, the host can ask important
+     * questions like 'what parameter is the user currently contained within?'.
+     */
+    interface SignatureHelpItem {
+        isVariadic: boolean;
+        prefixDisplayParts: SymbolDisplayPart[];
+        suffixDisplayParts: SymbolDisplayPart[];
+        separatorDisplayParts: SymbolDisplayPart[];
+        parameters: SignatureHelpParameter[];
+        documentation: SymbolDisplayPart[];
+        tags: JSDocTagInfo[];
+    }
+    /**
+     * Represents a set of signature help items, and the preferred item that should be selected.
+     */
+    interface SignatureHelpItems {
+        items: SignatureHelpItem[];
+        applicableSpan: TextSpan;
+        selectedItemIndex: number;
+        argumentIndex: number;
+        argumentCount: number;
+    }
+    interface CompletionInfo {
+        /** Not true for all glboal completions. This will be true if the enclosing scope matches a few syntax kinds. See `isSnippetScope`. */
+        isGlobalCompletion: boolean;
+        isMemberCompletion: boolean;
+        /**
+         * true when the current location also allows for a new identifier
+         */
+        isNewIdentifierLocation: boolean;
+        entries: CompletionEntry[];
+    }
+    interface CompletionEntry {
+        name: string;
+        kind: ScriptElementKind;
+        kindModifiers?: string;
+        sortText: string;
+        insertText?: string;
+        /**
+         * An optional span that indicates the text to be replaced by this completion item.
+         * If present, this span should be used instead of the default one.
+         * It will be set if the required span differs from the one generated by the default replacement behavior.
+         */
+        replacementSpan?: TextSpan;
+        hasAction?: true;
+        source?: string;
+        isRecommended?: true;
+    }
+    interface CompletionEntryDetails {
+        name: string;
+        kind: ScriptElementKind;
+        kindModifiers: string;
+        displayParts: SymbolDisplayPart[];
+        documentation?: SymbolDisplayPart[];
+        tags?: JSDocTagInfo[];
+        codeActions?: CodeAction[];
+        source?: SymbolDisplayPart[];
+    }
+    interface OutliningSpan {
+        /** The span of the document to actually collapse. */
+        textSpan: TextSpan;
+        /** The span of the document to display when the user hovers over the collapsed span. */
+        hintSpan: TextSpan;
+        /** The text to display in the editor for the collapsed region. */
+        bannerText: string;
+        /**
+         * Whether or not this region should be automatically collapsed when
+         * the 'Collapse to Definitions' command is invoked.
+         */
+        autoCollapse: boolean;
+        /**
+         * Classification of the contents of the span
+         */
+        kind: OutliningSpanKind;
+    }
+    enum OutliningSpanKind {
+        /** Single or multi-line comments */
+        Comment = "comment",
+        /** Sections marked by '// #region' and '// #endregion' comments */
+        Region = "region",
+        /** Declarations and expressions */
+        Code = "code",
+        /** Contiguous blocks of import declarations */
+        Imports = "imports"
+    }
+    enum OutputFileType {
+        JavaScript = 0,
+        SourceMap = 1,
+        Declaration = 2
+    }
+    enum EndOfLineState {
+        None = 0,
+        InMultiLineCommentTrivia = 1,
+        InSingleQuoteStringLiteral = 2,
+        InDoubleQuoteStringLiteral = 3,
+        InTemplateHeadOrNoSubstitutionTemplate = 4,
+        InTemplateMiddleOrTail = 5,
+        InTemplateSubstitutionPosition = 6
+    }
+    enum TokenClass {
+        Punctuation = 0,
+        Keyword = 1,
+        Operator = 2,
+        Comment = 3,
+        Whitespace = 4,
+        Identifier = 5,
+        NumberLiteral = 6,
+        StringLiteral = 7,
+        RegExpLiteral = 8
+    }
+    interface ClassificationResult {
+        finalLexState: EndOfLineState;
+        entries: ClassificationInfo[];
+    }
+    interface ClassificationInfo {
+        length: number;
+        classification: TokenClass;
+    }
+    interface Classifier {
+        /**
+         * Gives lexical classifications of tokens on a line without any syntactic context.
+         * For instance, a token consisting of the text 'string' can be either an identifier
+         * named 'string' or the keyword 'string', however, because this classifier is not aware,
+         * it relies on certain heuristics to give acceptable results. For classifications where
+         * speed trumps accuracy, this function is preferable; however, for true accuracy, the
+         * syntactic classifier is ideal. In fact, in certain editing scenarios, combining the
+         * lexical, syntactic, and semantic classifiers may issue the best user experience.
+         *
+         * @param text                      The text of a line to classify.
+         * @param lexState                  The state of the lexical classifier at the end of the previous line.
+         * @param syntacticClassifierAbsent Whether the client is *not* using a syntactic classifier.
+         *                                  If there is no syntactic classifier (syntacticClassifierAbsent=true),
+         *                                  certain heuristics may be used in its place; however, if there is a
+         *                                  syntactic classifier (syntacticClassifierAbsent=false), certain
+         *                                  classifications which may be incorrectly categorized will be given
+         *                                  back as Identifiers in order to allow the syntactic classifier to
+         *                                  subsume the classification.
+         * @deprecated Use getLexicalClassifications instead.
+         */
+        getClassificationsForLine(text: string, lexState: EndOfLineState, syntacticClassifierAbsent: boolean): ClassificationResult;
+        getEncodedLexicalClassifications(text: string, endOfLineState: EndOfLineState, syntacticClassifierAbsent: boolean): Classifications;
+    }
+    enum ScriptElementKind {
+        unknown = "",
+        warning = "warning",
+        /** predefined type (void) or keyword (class) */
+        keyword = "keyword",
+        /** top level script node */
+        scriptElement = "script",
+        /** module foo {} */
+        moduleElement = "module",
+        /** class X {} */
+        classElement = "class",
+        /** var x = class X {} */
+        localClassElement = "local class",
+        /** interface Y {} */
+        interfaceElement = "interface",
+        /** type T = ... */
+        typeElement = "type",
+        /** enum E */
+        enumElement = "enum",
+        enumMemberElement = "enum member",
+        /**
+         * Inside module and script only
+         * const v = ..
+         */
+        variableElement = "var",
+        /** Inside function */
+        localVariableElement = "local var",
+        /**
+         * Inside module and script only
+         * function f() { }
+         */
+        functionElement = "function",
+        /** Inside function */
+        localFunctionElement = "local function",
+        /** class X { [public|private]* foo() {} } */
+        memberFunctionElement = "method",
+        /** class X { [public|private]* [get|set] foo:number; } */
+        memberGetAccessorElement = "getter",
+        memberSetAccessorElement = "setter",
+        /**
+         * class X { [public|private]* foo:number; }
+         * interface Y { foo:number; }
+         */
+        memberVariableElement = "property",
+        /** class X { constructor() { } } */
+        constructorImplementationElement = "constructor",
+        /** interface Y { ():number; } */
+        callSignatureElement = "call",
+        /** interface Y { []:number; } */
+        indexSignatureElement = "index",
+        /** interface Y { new():Y; } */
+        constructSignatureElement = "construct",
+        /** function foo(*Y*: string) */
+        parameterElement = "parameter",
+        typeParameterElement = "type parameter",
+        primitiveType = "primitive type",
+        label = "label",
+        alias = "alias",
+        constElement = "const",
+        letElement = "let",
+        directory = "directory",
+        externalModuleName = "external module name",
+        /**
+         * <JsxTagName attribute1 attribute2={0} />
+         */
+        jsxAttribute = "JSX attribute",
+        /** String literal */
+        string = "string"
+    }
+    enum ScriptElementKindModifier {
+        none = "",
+        publicMemberModifier = "public",
+        privateMemberModifier = "private",
+        protectedMemberModifier = "protected",
+        exportedModifier = "export",
+        ambientModifier = "declare",
+        staticModifier = "static",
+        abstractModifier = "abstract",
+        optionalModifier = "optional"
+    }
+    enum ClassificationTypeNames {
+        comment = "comment",
+        identifier = "identifier",
+        keyword = "keyword",
+        numericLiteral = "number",
+        operator = "operator",
+        stringLiteral = "string",
+        whiteSpace = "whitespace",
+        text = "text",
+        punctuation = "punctuation",
+        className = "class name",
+        enumName = "enum name",
+        interfaceName = "interface name",
+        moduleName = "module name",
+        typeParameterName = "type parameter name",
+        typeAliasName = "type alias name",
+        parameterName = "parameter name",
+        docCommentTagName = "doc comment tag name",
+        jsxOpenTagName = "jsx open tag name",
+        jsxCloseTagName = "jsx close tag name",
+        jsxSelfClosingTagName = "jsx self closing tag name",
+        jsxAttribute = "jsx attribute",
+        jsxText = "jsx text",
+        jsxAttributeStringLiteralValue = "jsx attribute string literal value"
+    }
+    enum ClassificationType {
+        comment = 1,
+        identifier = 2,
+        keyword = 3,
+        numericLiteral = 4,
+        operator = 5,
+        stringLiteral = 6,
+        regularExpressionLiteral = 7,
+        whiteSpace = 8,
+        text = 9,
+        punctuation = 10,
+        className = 11,
+        enumName = 12,
+        interfaceName = 13,
+        moduleName = 14,
+        typeParameterName = 15,
+        typeAliasName = 16,
+        parameterName = 17,
+        docCommentTagName = 18,
+        jsxOpenTagName = 19,
+        jsxCloseTagName = 20,
+        jsxSelfClosingTagName = 21,
+        jsxAttribute = 22,
+        jsxText = 23,
+        jsxAttributeStringLiteralValue = 24
+    }
+}
+interface PromiseConstructor {
+    new <T>(executor: (resolve: (value?: T | PromiseLike<T>) => void, reject: (reason?: any) => void) => void): Promise<T>;
+    reject(reason: any): Promise<never>;
+    all<T>(values: (T | PromiseLike<T>)[]): Promise<T[]>;
+}
+declare var Promise: PromiseConstructor;
+declare namespace ts {
+    const scanner: Scanner;
+    enum SemanticMeaning {
+        None = 0,
+        Value = 1,
+        Type = 2,
+        Namespace = 4,
+        All = 7
+    }
+    function getMeaningFromDeclaration(node: Node): SemanticMeaning;
+    function getMeaningFromLocation(node: Node): SemanticMeaning;
+    function isInRightSideOfInternalImportEqualsDeclaration(node: Node): boolean;
+    function isCallExpressionTarget(node: Node): boolean;
+    function isNewExpressionTarget(node: Node): boolean;
+    function climbPastPropertyAccess(node: Node): Node;
+    function getTargetLabel(referenceNode: Node, labelName: string): Identifier | undefined;
+    function isJumpStatementTarget(node: Node): node is Identifier & {
+        parent: BreakOrContinueStatement;
+    };
+    function isLabelOfLabeledStatement(node: Node): node is Identifier;
+    function isLabelName(node: Node): boolean;
+    function isRightSideOfQualifiedName(node: Node): boolean;
+    function isRightSideOfPropertyAccess(node: Node): boolean;
+    function isNameOfModuleDeclaration(node: Node): boolean;
+    function isNameOfFunctionDeclaration(node: Node): boolean;
+    function isLiteralNameOfPropertyDeclarationOrIndexAccess(node: StringLiteral | NumericLiteral): boolean;
+    function isExpressionOfExternalModuleImportEqualsDeclaration(node: Node): boolean;
+    function getContainerNode(node: Node): Declaration | undefined;
+    function getNodeKind(node: Node): ScriptElementKind;
+    function isThis(node: Node): boolean;
+    interface ListItemInfo {
+        listItemIndex: number;
+        list: Node;
+    }
+    function getLineStartPositionForPosition(position: number, sourceFile: SourceFileLike): number;
+    function rangeContainsRange(r1: TextRange, r2: TextRange): boolean;
+    function rangeContainsPosition(r: TextRange, pos: number): boolean;
+    function rangeContainsPositionExclusive(r: TextRange, pos: number): boolean;
+    function startEndContainsRange(start: number, end: number, range: TextRange): boolean;
+    function rangeContainsStartEnd(range: TextRange, start: number, end: number): boolean;
+    function rangeOverlapsWithStartEnd(r1: TextRange, start: number, end: number): boolean;
+    function startEndOverlapsWithStartEnd(start1: number, end1: number, start2: number, end2: number): boolean;
+    /**
+     * Assumes `candidate.start <= position` holds.
+     */
+    function positionBelongsToNode(candidate: Node, position: number, sourceFile: SourceFile): boolean;
+    function findListItemInfo(node: Node): ListItemInfo | undefined;
+    function hasChildOfKind(n: Node, kind: SyntaxKind, sourceFile: SourceFile): boolean;
+    function findChildOfKind<T extends Node>(n: Node, kind: T["kind"], sourceFile: SourceFileLike): T | undefined;
+    function findContainingList(node: Node): SyntaxList | undefined;
+    /**
+     * Gets the token whose text has range [start, end) and
+     * position >= start and (position < end or (position === end && token is literal or keyword or identifier))
+     */
+    function getTouchingPropertyName(sourceFile: SourceFile, position: number): Node;
+    /**
+     * Returns the token if position is in [start, end).
+     * If position === end, returns the preceding token if includeItemAtEndPosition(previousToken) === true
+     */
+    function getTouchingToken(sourceFile: SourceFile, position: number, includeJsDocComment: boolean, includePrecedingTokenAtEndPosition?: (n: Node) => boolean): Node;
+    /** Returns a token if position is in [start-of-leading-trivia, end) */
+    function getTokenAtPosition(sourceFile: SourceFile, position: number, includeJsDocComment: boolean, includeEndPosition?: boolean): Node;
+    /**
+     * The token on the left of the position is the token that strictly includes the position
+     * or sits to the left of the cursor if it is on a boundary. For example
+     *
+     *   fo|o               -> will return foo
+     *   foo <comment> |bar -> will return foo
+     *
+     */
+    function findTokenOnLeftOfPosition(file: SourceFile, position: number): Node | undefined;
+    function findNextToken(previousToken: Node, parent: Node, sourceFile: SourceFile): Node | undefined;
+    /**
+     * Finds the rightmost token satisfying `token.end <= position`,
+     * excluding `JsxText` tokens containing only whitespace.
+     */
+    function findPrecedingToken(position: number, sourceFile: SourceFile, startNode?: Node, includeJsDoc?: boolean): Node | undefined;
+    function isInString(sourceFile: SourceFile, position: number, previousToken?: Node | undefined): boolean;
+    /**
+     * returns true if the position is in between the open and close elements of an JSX expression.
+     */
+    function isInsideJsxElementOrAttribute(sourceFile: SourceFile, position: number): boolean;
+    function isInTemplateString(sourceFile: SourceFile, position: number): boolean;
+    function findPrecedingMatchingToken(token: Node, matchingTokenKind: SyntaxKind, sourceFile: SourceFile): Node | undefined;
+    interface PossibleTypeArgumentInfo {
+        readonly called: Identifier;
+        readonly nTypeArguments: number;
+    }
+    function isPossiblyTypeArgumentPosition(tokenIn: Node, sourceFile: SourceFile): PossibleTypeArgumentInfo | undefined;
+    /**
+     * Returns true if the cursor at position in sourceFile is within a comment.
+     *
+     * @param tokenAtPosition Must equal `getTokenAtPosition(sourceFile, position)
+     * @param predicate Additional predicate to test on the comment range.
+     */
+    function isInComment(sourceFile: SourceFile, position: number, tokenAtPosition?: Node, predicate?: (c: CommentRange) => boolean): boolean;
+    function hasDocComment(sourceFile: SourceFile, position: number): boolean | undefined;
+    function getNodeModifiers(node: Node): string;
+    function getTypeArgumentOrTypeParameterList(node: Node): NodeArray<Node> | undefined;
+    function isComment(kind: SyntaxKind): boolean;
+    function isStringOrRegularExpressionOrTemplateLiteral(kind: SyntaxKind): boolean;
+    function isPunctuation(kind: SyntaxKind): boolean;
+    function isInsideTemplateLiteral(node: TemplateLiteralToken, position: number, sourceFile: SourceFile): boolean;
+    function isAccessibilityModifier(kind: SyntaxKind): boolean;
+    function cloneCompilerOptions(options: CompilerOptions): CompilerOptions;
+    function isArrayLiteralOrObjectLiteralDestructuringPattern(node: Node): boolean;
+    function isInReferenceComment(sourceFile: SourceFile, position: number): boolean;
+    function isInNonReferenceComment(sourceFile: SourceFile, position: number): boolean;
+    function createTextSpanFromNode(node: Node, sourceFile?: SourceFile): TextSpan;
+    function createTextSpanFromRange(range: TextRange): TextSpan;
+    function createTextRangeFromSpan(span: TextSpan): TextRange;
+    function createTextChangeFromStartLength(start: number, length: number, newText: string): TextChange;
+    function createTextChange(span: TextSpan, newText: string): TextChange;
+    const typeKeywords: ReadonlyArray<SyntaxKind>;
+    function isTypeKeyword(kind: SyntaxKind): boolean;
+    /** True if the symbol is for an external module, as opposed to a namespace. */
+    function isExternalModuleSymbol(moduleSymbol: Symbol): boolean;
+    /** Returns `true` the first time it encounters a node and `false` afterwards. */
+    type NodeSeenTracker<T = Node> = (node: T) => boolean;
+    function nodeSeenTracker<T extends Node>(): NodeSeenTracker<T>;
+    function getSnapshotText(snap: IScriptSnapshot): string;
+    function repeatString(str: string, count: number): string;
+    function skipConstraint(type: Type): Type;
+    function getNameFromPropertyName(name: PropertyName): string | undefined;
+    function programContainsEs6Modules(program: Program): boolean;
+    function compilerOptionsIndicateEs6Modules(compilerOptions: CompilerOptions): boolean;
+    function hostUsesCaseSensitiveFileNames(host: LanguageServiceHost): boolean;
+    function hostGetCanonicalFileName(host: LanguageServiceHost): GetCanonicalFileName;
+    function makeImportIfNecessary(defaultImport: Identifier | undefined, namedImports: ReadonlyArray<ImportSpecifier> | undefined, moduleSpecifier: string, quotePreference: QuotePreference): ImportDeclaration | undefined;
+    function makeImport(defaultImport: Identifier | undefined, namedImports: ReadonlyArray<ImportSpecifier> | undefined, moduleSpecifier: string | Expression, quotePreference: QuotePreference): ImportDeclaration;
+    function makeStringLiteral(text: string, quotePreference: QuotePreference): StringLiteral;
+    enum QuotePreference {
+        Single = 0,
+        Double = 1
+    }
+    function getQuotePreference(sourceFile: SourceFile, preferences: UserPreferences): QuotePreference;
+    function symbolNameNoDefault(symbol: Symbol): string | undefined;
+    function symbolEscapedNameNoDefault(symbol: Symbol): __String | undefined;
+    function getPropertySymbolFromBindingElement(checker: TypeChecker, bindingElement: BindingElement & {
+        name: Identifier;
+    }): Symbol | undefined;
+    /**
+     * Find symbol of the given property-name and add the symbol to the given result array
+     * @param symbol a symbol to start searching for the given propertyName
+     * @param propertyName a name of property to search for
+     * @param result an array of symbol of found property symbols
+     * @param previousIterationSymbolsCache a cache of symbol from previous iterations of calling this function to prevent infinite revisiting of the same symbol.
+     *                                The value of previousIterationSymbol is undefined when the function is first called.
+     */
+    function getPropertySymbolsFromBaseTypes<T>(symbol: Symbol, propertyName: string, checker: TypeChecker, cb: (symbol: Symbol) => T | undefined): T | undefined;
+    function isMemberSymbolInBaseType(memberSymbol: Symbol, checker: TypeChecker): boolean;
+    class NodeSet {
+        private map;
+        add(node: Node): void;
+        has(node: Node): boolean;
+        forEach(cb: (node: Node) => void): void;
+        some(pred: (node: Node) => boolean): boolean;
+    }
+    function getParentNodeInSpan(node: Node | undefined, file: SourceFile, span: TextSpan): Node | undefined;
+}
+declare namespace ts {
+    function isFirstDeclarationOfSymbolParameter(symbol: Symbol): boolean;
+    function symbolPart(text: string, symbol: Symbol): SymbolDisplayPart;
+    function displayPart(text: string, kind: SymbolDisplayPartKind): SymbolDisplayPart;
+    function spacePart(): SymbolDisplayPart;
+    function keywordPart(kind: SyntaxKind): SymbolDisplayPart;
+    function punctuationPart(kind: SyntaxKind): SymbolDisplayPart;
+    function operatorPart(kind: SyntaxKind): SymbolDisplayPart;
+    function textOrKeywordPart(text: string): SymbolDisplayPart;
+    function textPart(text: string): SymbolDisplayPart;
+    /**
+     * The default is CRLF.
+     */
+    function getNewLineOrDefaultFromHost(host: LanguageServiceHost | LanguageServiceShimHost, formatSettings?: FormatCodeSettings): string;
+    function lineBreakPart(): SymbolDisplayPart;
+    function mapToDisplayParts(writeDisplayParts: (writer: DisplayPartsSymbolWriter) => void): SymbolDisplayPart[];
+    function typeToDisplayParts(typechecker: TypeChecker, type: Type, enclosingDeclaration?: Node, flags?: TypeFormatFlags): SymbolDisplayPart[];
+    function symbolToDisplayParts(typeChecker: TypeChecker, symbol: Symbol, enclosingDeclaration?: Node, meaning?: SymbolFlags, flags?: SymbolFormatFlags): SymbolDisplayPart[];
+    function signatureToDisplayParts(typechecker: TypeChecker, signature: Signature, enclosingDeclaration?: Node, flags?: TypeFormatFlags): SymbolDisplayPart[];
+    function isImportOrExportSpecifierName(location: Node): location is Identifier;
+    /**
+     * Strip off existed single quotes or double quotes from a given string
+     *
+     * @return non-quoted string
+     */
+    function stripQuotes(name: string): string;
+    function startsWithQuote(name: string): boolean;
+    function scriptKindIs(fileName: string, host: LanguageServiceHost, ...scriptKinds: ScriptKind[]): boolean;
+    function getScriptKind(fileName: string, host?: LanguageServiceHost): ScriptKind;
+    function getUniqueSymbolId(symbol: Symbol, checker: TypeChecker): number;
+    function getFirstNonSpaceCharacterPosition(text: string, position: number): number;
+    /**
+     * Creates a deep, memberwise clone of a node with no source map location.
+     *
+     * WARNING: This is an expensive operation and is only intended to be used in refactorings
+     * and code fixes (because those are triggered by explicit user actions).
+     */
+    function getSynthesizedDeepClone<T extends Node | undefined>(node: T, includeTrivia?: boolean): T;
+    function getSynthesizedDeepClones<T extends Node>(nodes: NodeArray<T>, includeTrivia?: boolean): NodeArray<T>;
+    function getSynthesizedDeepClones<T extends Node>(nodes: NodeArray<T> | undefined, includeTrivia?: boolean): NodeArray<T> | undefined;
+    /**
+     * Sets EmitFlags to suppress leading and trailing trivia on the node.
+     */
+    function suppressLeadingAndTrailingTrivia(node: Node): void;
+    /**
+     * Sets EmitFlags to suppress leading trivia on the node.
+     */
+    function suppressLeadingTrivia(node: Node): void;
+    /**
+     * Sets EmitFlags to suppress trailing trivia on the node.
+     */
+    function suppressTrailingTrivia(node: Node): void;
+    function getUniqueName(baseName: string, sourceFile: SourceFile): string;
+    /**
+     * @return The index of the (only) reference to the extracted symbol.  We want the cursor
+     * to be on the reference, rather than the declaration, because it's closer to where the
+     * user was before extracting it.
+     */
+    function getRenameLocation(edits: ReadonlyArray<FileTextChanges>, renameFilename: string, name: string, preferLastLocation: boolean): number;
+}
+declare namespace ts {
+    function createClassifier(): Classifier;
+    function getSemanticClassifications(typeChecker: TypeChecker, cancellationToken: CancellationToken, sourceFile: SourceFile, classifiableNames: UnderscoreEscapedMap<true>, span: TextSpan): ClassifiedSpan[];
+    function getEncodedSemanticClassifications(typeChecker: TypeChecker, cancellationToken: CancellationToken, sourceFile: SourceFile, classifiableNames: UnderscoreEscapedMap<true>, span: TextSpan): Classifications;
+    function getSyntacticClassifications(cancellationToken: CancellationToken, sourceFile: SourceFile, span: TextSpan): ClassifiedSpan[];
+    function getEncodedSyntacticClassifications(cancellationToken: CancellationToken, sourceFile: SourceFile, span: TextSpan): Classifications;
+}
+declare namespace ts.Completions.PathCompletions {
+    interface NameAndKind {
+        readonly name: string;
+        readonly kind: ScriptElementKind.scriptElement | ScriptElementKind.directory | ScriptElementKind.externalModuleName;
+    }
+    interface PathCompletion extends NameAndKind {
+        readonly span: TextSpan | undefined;
+    }
+    function getStringLiteralCompletionsFromModuleNames(sourceFile: SourceFile, node: LiteralExpression, compilerOptions: CompilerOptions, host: LanguageServiceHost, typeChecker: TypeChecker): ReadonlyArray<PathCompletion>;
+    function getTripleSlashReferenceCompletion(sourceFile: SourceFile, position: number, compilerOptions: CompilerOptions, host: LanguageServiceHost): ReadonlyArray<PathCompletion> | undefined;
+}
+declare namespace ts.Completions {
+    type Log = (message: string) => void;
+    function getCompletionsAtPosition(host: LanguageServiceHost, program: Program, log: Log, sourceFile: SourceFile, position: number, preferences: UserPreferences, triggerCharacter: CompletionsTriggerCharacter | undefined): CompletionInfo | undefined;
+    interface CompletionEntryIdentifier {
+        name: string;
+        source?: string;
+    }
+    function getCompletionEntryDetails(program: Program, log: Log, sourceFile: SourceFile, position: number, entryId: CompletionEntryIdentifier, host: LanguageServiceHost, formatContext: formatting.FormatContext, getCanonicalFileName: GetCanonicalFileName, preferences: UserPreferences, cancellationToken: CancellationToken): CompletionEntryDetails | undefined;
+    function getCompletionEntrySymbol(program: Program, log: Log, sourceFile: SourceFile, position: number, entryId: CompletionEntryIdentifier): Symbol | undefined;
+}
+declare namespace ts.DocumentHighlights {
+    function getDocumentHighlights(program: Program, cancellationToken: CancellationToken, sourceFile: SourceFile, position: number, sourceFilesToSearch: ReadonlyArray<SourceFile>): DocumentHighlights[] | undefined;
+}
+declare namespace ts {
+    /**
+     * The document registry represents a store of SourceFile objects that can be shared between
+     * multiple LanguageService instances. A LanguageService instance holds on the SourceFile (AST)
+     * of files in the context.
+     * SourceFile objects account for most of the memory usage by the language service. Sharing
+     * the same DocumentRegistry instance between different instances of LanguageService allow
+     * for more efficient memory utilization since all projects will share at least the library
+     * file (lib.d.ts).
+     *
+     * A more advanced use of the document registry is to serialize sourceFile objects to disk
+     * and re-hydrate them when needed.
+     *
+     * To create a default DocumentRegistry, use createDocumentRegistry to create one, and pass it
+     * to all subsequent createLanguageService calls.
+     */
+    interface DocumentRegistry {
+        /**
+         * Request a stored SourceFile with a given fileName and compilationSettings.
+         * The first call to acquire will call createLanguageServiceSourceFile to generate
+         * the SourceFile if was not found in the registry.
+         *
+         * @param fileName The name of the file requested
+         * @param compilationSettings Some compilation settings like target affects the
+         * shape of a the resulting SourceFile. This allows the DocumentRegistry to store
+         * multiple copies of the same file for different compilation settings.
+         * @param scriptSnapshot Text of the file. Only used if the file was not found
+         * in the registry and a new one was created.
+         * @param version Current version of the file. Only used if the file was not found
+         * in the registry and a new one was created.
+         */
+        acquireDocument(fileName: string, compilationSettings: CompilerOptions, scriptSnapshot: IScriptSnapshot, version: string, scriptKind?: ScriptKind): SourceFile;
+        acquireDocumentWithKey(fileName: string, path: Path, compilationSettings: CompilerOptions, key: DocumentRegistryBucketKey, scriptSnapshot: IScriptSnapshot, version: string, scriptKind?: ScriptKind): SourceFile;
+        /**
+         * Request an updated version of an already existing SourceFile with a given fileName
+         * and compilationSettings. The update will in-turn call updateLanguageServiceSourceFile
+         * to get an updated SourceFile.
+         *
+         * @param fileName The name of the file requested
+         * @param compilationSettings Some compilation settings like target affects the
+         * shape of a the resulting SourceFile. This allows the DocumentRegistry to store
+         * multiple copies of the same file for different compilation settings.
+         * @param scriptSnapshot Text of the file.
+         * @param version Current version of the file.
+         */
+        updateDocument(fileName: string, compilationSettings: CompilerOptions, scriptSnapshot: IScriptSnapshot, version: string, scriptKind?: ScriptKind): SourceFile;
+        updateDocumentWithKey(fileName: string, path: Path, compilationSettings: CompilerOptions, key: DocumentRegistryBucketKey, scriptSnapshot: IScriptSnapshot, version: string, scriptKind?: ScriptKind): SourceFile;
+        getKeyForCompilationSettings(settings: CompilerOptions): DocumentRegistryBucketKey;
+        /**
+         * Informs the DocumentRegistry that a file is not needed any longer.
+         *
+         * Note: It is not allowed to call release on a SourceFile that was not acquired from
+         * this registry originally.
+         *
+         * @param fileName The name of the file to be released
+         * @param compilationSettings The compilation settings used to acquire the file
+         */
+        releaseDocument(fileName: string, compilationSettings: CompilerOptions): void;
+        releaseDocumentWithKey(path: Path, key: DocumentRegistryBucketKey): void;
+        getLanguageServiceRefCounts(path: Path): [string, number | undefined][];
+        reportStats(): string;
+    }
+    interface ExternalDocumentCache {
+        setDocument(key: DocumentRegistryBucketKey, path: Path, sourceFile: SourceFile): void;
+        getDocument(key: DocumentRegistryBucketKey, path: Path): SourceFile | undefined;
+    }
+    type DocumentRegistryBucketKey = string & {
+        __bucketKey: any;
+    };
+    function createDocumentRegistry(useCaseSensitiveFileNames?: boolean, currentDirectory?: string): DocumentRegistry;
+    function createDocumentRegistryInternal(useCaseSensitiveFileNames?: boolean, currentDirectory?: string, externalCache?: ExternalDocumentCache): DocumentRegistry;
+}
+declare namespace ts.FindAllReferences {
+    interface ImportsResult {
+        /** For every import of the symbol, the location and local symbol for the import. */
+        importSearches: ReadonlyArray<[Identifier, Symbol]>;
+        /** For rename imports/exports `{ foo as bar }`, `foo` is not a local, so it may be added as a reference immediately without further searching. */
+        singleReferences: ReadonlyArray<Identifier | StringLiteral>;
+        /** List of source files that may (or may not) use the symbol via a namespace. (For UMD modules this is every file.) */
+        indirectUsers: ReadonlyArray<SourceFile>;
+    }
+    type ImportTracker = (exportSymbol: Symbol, exportInfo: ExportInfo, isForRename: boolean) => ImportsResult;
+    /** Creates the imports map and returns an ImportTracker that uses it. Call this lazily to avoid calling `getDirectImportsMap` unnecessarily.  */
+    function createImportTracker(sourceFiles: ReadonlyArray<SourceFile>, sourceFilesSet: ReadonlyMap<true>, checker: TypeChecker, cancellationToken: CancellationToken): ImportTracker;
+    /** Info about an exported symbol to perform recursive search on. */
+    interface ExportInfo {
+        exportingModuleSymbol: Symbol;
+        exportKind: ExportKind;
+    }
+    enum ExportKind {
+        Named = 0,
+        Default = 1,
+        ExportEquals = 2
+    }
+    enum ImportExport {
+        Import = 0,
+        Export = 1
+    }
+    type ModuleReference = {
+        kind: "import";
+        literal: StringLiteralLike;
+    }
+    /** <reference path> or <reference types> */
+     | {
+        kind: "reference";
+        referencingFile: SourceFile;
+        ref: FileReference;
+    };
+    function findModuleReferences(program: Program, sourceFiles: ReadonlyArray<SourceFile>, searchModuleSymbol: Symbol): ModuleReference[];
+    interface ImportedSymbol {
+        kind: ImportExport.Import;
+        symbol: Symbol;
+        isNamedImport: boolean;
+    }
+    interface ExportedSymbol {
+        kind: ImportExport.Export;
+        symbol: Symbol;
+        exportInfo: ExportInfo;
+    }
+    /**
+     * Given a local reference, we might notice that it's an import/export and recursively search for references of that.
+     * If at an import, look locally for the symbol it imports.
+     * If an an export, look for all imports of it.
+     * This doesn't handle export specifiers; that is done in `getReferencesAtExportSpecifier`.
+     * @param comingFromExport If we are doing a search for all exports, don't bother looking backwards for the imported symbol, since that's the reason we're here.
+     */
+    function getImportOrExportSymbol(node: Node, symbol: Symbol, checker: TypeChecker, comingFromExport: boolean): ImportedSymbol | ExportedSymbol | undefined;
+    function getExportInfo(exportSymbol: Symbol, exportKind: ExportKind, checker: TypeChecker): ExportInfo | undefined;
+}
+declare namespace ts.FindAllReferences {
+    interface SymbolAndEntries {
+        definition: Definition | undefined;
+        references: Entry[];
+    }
+    type Definition = {
+        type: "symbol";
+        symbol: Symbol;
+    } | {
+        type: "label";
+        node: Identifier;
+    } | {
+        type: "keyword";
+        node: Node;
+    } | {
+        type: "this";
+        node: Node;
+    } | {
+        type: "string";
+        node: StringLiteral;
+    };
+    type Entry = NodeEntry | SpanEntry;
+    interface NodeEntry {
+        type: "node";
+        node: Node;
+        isInString?: true;
+    }
+    interface SpanEntry {
+        type: "span";
+        fileName: string;
+        textSpan: TextSpan;
+    }
+    function nodeEntry(node: Node, isInString?: true): NodeEntry;
+    interface Options {
+        readonly findInStrings?: boolean;
+        readonly findInComments?: boolean;
+        /**
+         * True if we are renaming the symbol.
+         * If so, we will find fewer references -- if it is referenced by several different names, we sill only find references for the original name.
+         */
+        readonly isForRename?: boolean;
+        /** True if we are searching for implementations. We will have a different method of adding references if so. */
+        readonly implementations?: boolean;
+    }
+    function findReferencedSymbols(program: Program, cancellationToken: CancellationToken, sourceFiles: ReadonlyArray<SourceFile>, sourceFile: SourceFile, position: number): ReferencedSymbol[] | undefined;
+    function getImplementationsAtPosition(program: Program, cancellationToken: CancellationToken, sourceFiles: ReadonlyArray<SourceFile>, sourceFile: SourceFile, position: number): ImplementationLocation[] | undefined;
+    function findReferencedEntries(program: Program, cancellationToken: CancellationToken, sourceFiles: ReadonlyArray<SourceFile>, sourceFile: SourceFile, position: number, options?: Options): ReferenceEntry[] | undefined;
+    function getReferenceEntriesForNode(position: number, node: Node, program: Program, sourceFiles: ReadonlyArray<SourceFile>, cancellationToken: CancellationToken, options?: Options, sourceFilesSet?: ReadonlyMap<true>): Entry[] | undefined;
+    function toHighlightSpan(entry: Entry): {
+        fileName: string;
+        span: HighlightSpan;
+    };
+}
+/** Encapsulates the core find-all-references algorithm. */
+declare namespace ts.FindAllReferences.Core {
+    /** Core find-all-references algorithm. Handles special cases before delegating to `getReferencedSymbolsForSymbol`. */
+    function getReferencedSymbolsForNode(position: number, node: Node, program: Program, sourceFiles: ReadonlyArray<SourceFile>, cancellationToken: CancellationToken, options?: Options, sourceFilesSet?: ReadonlyMap<true>): SymbolAndEntries[] | undefined;
+    /** Used as a quick check for whether a symbol is used at all in a file (besides its definition). */
+    function isSymbolReferencedInFile(definition: Identifier, checker: TypeChecker, sourceFile: SourceFile): boolean;
+    function eachSymbolReferenceInFile<T>(definition: Identifier, checker: TypeChecker, sourceFile: SourceFile, cb: (token: Identifier) => T): T | undefined;
+    /**
+     * Given an initial searchMeaning, extracted from a location, widen the search scope based on the declarations
+     * of the corresponding symbol. e.g. if we are searching for "Foo" in value position, but "Foo" references a class
+     * then we need to widen the search to include type positions as well.
+     * On the contrary, if we are searching for "Bar" in type position and we trace bar to an interface, and an uninstantiated
+     * module, we want to keep the search limited to only types, as the two declarations (interface and uninstantiated module)
+     * do not intersect in any of the three spaces.
+     */
+    function getIntersectingMeaningFromDeclarations(node: Node, symbol: Symbol): SemanticMeaning;
+    function getReferenceEntriesForShorthandPropertyAssignment(node: Node, checker: TypeChecker, addReference: (node: Node) => void): void;
+}
+declare namespace ts {
+    function getEditsForFileRename(program: Program, oldFileOrDirPath: string, newFileOrDirPath: string, host: LanguageServiceHost, formatContext: formatting.FormatContext, preferences: UserPreferences): ReadonlyArray<FileTextChanges>;
+}
+declare namespace ts.GoToDefinition {
+    function getDefinitionAtPosition(program: Program, sourceFile: SourceFile, position: number): DefinitionInfo[] | undefined;
+    function getReferenceAtPosition(sourceFile: SourceFile, position: number, program: Program): {
+        fileName: string;
+        file: SourceFile;
+    } | undefined;
+    function getTypeDefinitionAtPosition(typeChecker: TypeChecker, sourceFile: SourceFile, position: number): DefinitionInfo[] | undefined;
+    function getDefinitionAndBoundSpan(program: Program, sourceFile: SourceFile, position: number): DefinitionInfoAndBoundSpan | undefined;
+    function findReferenceInPosition(refs: ReadonlyArray<FileReference>, pos: number): FileReference | undefined;
+}
+declare namespace ts.JsDoc {
+    function getJsDocCommentsFromDeclarations(declarations: ReadonlyArray<Declaration>): SymbolDisplayPart[];
+    function getJsDocTagsFromDeclarations(declarations?: Declaration[]): JSDocTagInfo[];
+    function getJSDocTagNameCompletions(): CompletionEntry[];
+    const getJSDocTagNameCompletionDetails: typeof getJSDocTagCompletionDetails;
+    function getJSDocTagCompletions(): CompletionEntry[];
+    function getJSDocTagCompletionDetails(name: string): CompletionEntryDetails;
+    function getJSDocParameterNameCompletions(tag: JSDocParameterTag): CompletionEntry[];
+    function getJSDocParameterNameCompletionDetails(name: string): CompletionEntryDetails;
+    /**
+     * Checks if position points to a valid position to add JSDoc comments, and if so,
+     * returns the appropriate template. Otherwise returns an empty string.
+     * Valid positions are
+     *      - outside of comments, statements, and expressions, and
+     *      - preceding a:
+     *          - function/constructor/method declaration
+     *          - class declarations
+     *          - variable statements
+     *          - namespace declarations
+     *          - interface declarations
+     *          - method signatures
+     *          - type alias declarations
+     *
+     * Hosts should ideally check that:
+     * - The line is all whitespace up to 'position' before performing the insertion.
+     * - If the keystroke sequence "/\*\*" induced the call, we also check that the next
+     * non-whitespace character is '*', which (approximately) indicates whether we added
+     * the second '*' to complete an existing (JSDoc) comment.
+     * @param fileName The file in which to perform the check.
+     * @param position The (character-indexed) position in the file where the check should
+     * be performed.
+     */
+    function getDocCommentTemplateAtPosition(newLine: string, sourceFile: SourceFile, position: number): TextInsertion | undefined;
+}
+declare namespace ts.NavigateTo {
+    function getNavigateToItems(sourceFiles: ReadonlyArray<SourceFile>, checker: TypeChecker, cancellationToken: CancellationToken, searchValue: string, maxResultCount: number | undefined, excludeDtsFiles: boolean): NavigateToItem[];
+}
+declare namespace ts.NavigationBar {
+    function getNavigationBarItems(sourceFile: SourceFile, cancellationToken: CancellationToken): NavigationBarItem[];
+    function getNavigationTree(sourceFile: SourceFile, cancellationToken: CancellationToken): NavigationTree;
+}
+declare namespace ts.OrganizeImports {
+    /**
+     * Organize imports by:
+     *   1) Removing unused imports
+     *   2) Coalescing imports from the same module
+     *   3) Sorting imports
+     */
+    function organizeImports(sourceFile: SourceFile, formatContext: formatting.FormatContext, host: LanguageServiceHost, program: Program, _preferences: UserPreferences): FileTextChanges[];
+    /**
+     * @param importGroup a list of ImportDeclarations, all with the same module name.
+     */
+    function coalesceImports(importGroup: ReadonlyArray<ImportDeclaration>): ReadonlyArray<ImportDeclaration>;
+    /**
+     * @param exportGroup a list of ExportDeclarations, all with the same module name.
+     */
+    function coalesceExports(exportGroup: ReadonlyArray<ExportDeclaration>): ReadonlyArray<ExportDeclaration>;
+    function compareModuleSpecifiers(m1: Expression, m2: Expression): Comparison;
+}
+declare namespace ts.OutliningElementsCollector {
+    function collectElements(sourceFile: SourceFile, cancellationToken: CancellationToken): OutliningSpan[];
+}
+declare namespace ts {
+    enum PatternMatchKind {
+        exact = 0,
+        prefix = 1,
+        substring = 2,
+        camelCase = 3
+    }
+    interface PatternMatch {
+        kind: PatternMatchKind;
+        isCaseSensitive: boolean;
+    }
+    interface PatternMatcher {
+        getMatchForLastSegmentOfPattern(candidate: string): PatternMatch | undefined;
+        getFullMatch(candidateContainers: ReadonlyArray<string>, candidate: string): PatternMatch | undefined;
+        patternContainsDots: boolean;
+    }
+    function createPatternMatcher(pattern: string): PatternMatcher | undefined;
+    function breakIntoCharacterSpans(identifier: string): TextSpan[];
+    function breakIntoWordSpans(identifier: string): TextSpan[];
+}
+declare namespace ts {
+    function preProcessFile(sourceText: string, readImportFiles?: boolean, detectJavaScriptImports?: boolean): PreProcessedFileInfo;
+}
+declare namespace ts.Rename {
+    function getRenameInfo(typeChecker: TypeChecker, defaultLibFileName: string, getCanonicalFileName: GetCanonicalFileName, sourceFile: SourceFile, position: number): RenameInfo;
+}
+declare namespace ts.SignatureHelp {
+    function getSignatureHelpItems(program: Program, sourceFile: SourceFile, position: number, cancellationToken: CancellationToken): SignatureHelpItems | undefined;
+    interface ArgumentInfoForCompletions {
+        readonly invocation: CallLikeExpression;
+        readonly argumentIndex: number;
+        readonly argumentCount: number;
+    }
+    function getArgumentInfoForCompletions(node: Node, position: number, sourceFile: SourceFile): ArgumentInfoForCompletions | undefined;
+}
+declare namespace ts {
+    function computeSuggestionDiagnostics(sourceFile: SourceFile, program: Program, cancellationToken: CancellationToken): DiagnosticWithLocation[];
+}
+declare namespace ts.SymbolDisplay {
+    function getSymbolKind(typeChecker: TypeChecker, symbol: Symbol, location: Node): ScriptElementKind;
+    function getSymbolModifiers(symbol: Symbol): string;
+    interface SymbolDisplayPartsDocumentationAndSymbolKind {
+        displayParts: SymbolDisplayPart[];
+        documentation: SymbolDisplayPart[];
+        symbolKind: ScriptElementKind;
+        tags: JSDocTagInfo[] | undefined;
+    }
+    function getSymbolDisplayPartsDocumentationAndSymbolKind(typeChecker: TypeChecker, symbol: Symbol, sourceFile: SourceFile, enclosingDeclaration: Node | undefined, location: Node, semanticMeaning?: SemanticMeaning, alias?: Symbol): SymbolDisplayPartsDocumentationAndSymbolKind;
+}
+declare namespace ts {
+    interface TranspileOptions {
+        compilerOptions?: CompilerOptions;
+        fileName?: string;
+        reportDiagnostics?: boolean;
+        moduleName?: string;
+        renamedDependencies?: MapLike<string>;
+        transformers?: CustomTransformers;
+    }
+    interface TranspileOutput {
+        outputText: string;
+        diagnostics?: Diagnostic[];
+        sourceMapText?: string;
+    }
+    function transpileModule(input: string, transpileOptions: TranspileOptions): TranspileOutput;
+    function transpile(input: string, compilerOptions?: CompilerOptions, fileName?: string, diagnostics?: Diagnostic[], moduleName?: string): string;
+    /** JS users may pass in string values for enum compiler options (such as ModuleKind), so convert. */
+    function fixupCompilerOptions(options: CompilerOptions, diagnostics: Diagnostic[]): CompilerOptions;
+}
+declare namespace ts.formatting {
+    enum FormattingRequestKind {
+        FormatDocument = 0,
+        FormatSelection = 1,
+        FormatOnEnter = 2,
+        FormatOnSemicolon = 3,
+        FormatOnOpeningCurlyBrace = 4,
+        FormatOnClosingCurlyBrace = 5
+    }
+    class FormattingContext {
+        readonly sourceFile: SourceFileLike;
+        formattingRequestKind: FormattingRequestKind;
+        options: FormatCodeSettings;
+        currentTokenSpan: TextRangeWithKind;
+        nextTokenSpan: TextRangeWithKind;
+        contextNode: Node;
+        currentTokenParent: Node;
+        nextTokenParent: Node;
+        private contextNodeAllOnSameLine;
+        private nextNodeAllOnSameLine;
+        private tokensAreOnSameLine;
+        private contextNodeBlockIsOnOneLine;
+        private nextNodeBlockIsOnOneLine;
+        constructor(sourceFile: SourceFileLike, formattingRequestKind: FormattingRequestKind, options: FormatCodeSettings);
+        updateContext(currentRange: TextRangeWithKind, currentTokenParent: Node, nextRange: TextRangeWithKind, nextTokenParent: Node, commonParent: Node): void;
+        ContextNodeAllOnSameLine(): boolean;
+        NextNodeAllOnSameLine(): boolean;
+        TokensAreOnSameLine(): boolean;
+        ContextNodeBlockIsOnOneLine(): boolean;
+        NextNodeBlockIsOnOneLine(): boolean;
+        private NodeIsOnOneLine;
+        private BlockIsOnOneLine;
+    }
+}
+declare namespace ts.formatting {
+    interface FormattingScanner {
+        advance(): void;
+        isOnToken(): boolean;
+        readTokenInfo(n: Node): TokenInfo;
+        getCurrentLeadingTrivia(): TextRangeWithKind[] | undefined;
+        lastTrailingTriviaWasNewLine(): boolean;
+        skipToEndOf(node: Node): void;
+    }
+    function getFormattingScanner<T>(text: string, languageVariant: LanguageVariant, startPos: number, endPos: number, cb: (scanner: FormattingScanner) => T): T;
+}
+declare namespace ts.formatting {
+    interface Rule {
+        readonly debugName: string;
+        readonly context: ReadonlyArray<ContextPredicate>;
+        readonly action: RuleAction;
+        readonly flags: RuleFlags;
+    }
+    type ContextPredicate = (context: FormattingContext) => boolean;
+    const anyContext: ReadonlyArray<ContextPredicate>;
+    enum RuleAction {
+        Ignore = 1,
+        Space = 2,
+        NewLine = 4,
+        Delete = 8
+    }
+    enum RuleFlags {
+        None = 0,
+        CanDeleteNewLines = 1
+    }
+    interface TokenRange {
+        readonly tokens: ReadonlyArray<SyntaxKind>;
+        readonly isSpecific: boolean;
+    }
+}
+declare namespace ts.formatting {
+    interface RuleSpec {
+        readonly leftTokenRange: TokenRange;
+        readonly rightTokenRange: TokenRange;
+        readonly rule: Rule;
+    }
+    function getAllRules(): RuleSpec[];
+}
+declare namespace ts.formatting {
+    function getFormatContext(options: FormatCodeSettings): FormatContext;
+    type RulesMap = (context: FormattingContext) => Rule | undefined;
+}
+declare namespace ts.formatting {
+    interface FormatContext {
+        readonly options: FormatCodeSettings;
+        readonly getRule: RulesMap;
+    }
+    interface TextRangeWithKind extends TextRange {
+        kind: SyntaxKind;
+    }
+    interface TextRangeWithTriviaKind extends TextRange {
+        kind: TriviaKind;
+    }
+    interface TokenInfo {
+        leadingTrivia: TextRangeWithTriviaKind[] | undefined;
+        token: TextRangeWithKind;
+        trailingTrivia: TextRangeWithTriviaKind[] | undefined;
+    }
+    function formatOnEnter(position: number, sourceFile: SourceFile, formatContext: FormatContext): TextChange[];
+    function formatOnSemicolon(position: number, sourceFile: SourceFile, formatContext: FormatContext): TextChange[];
+    function formatOnOpeningCurly(position: number, sourceFile: SourceFile, formatContext: FormatContext): TextChange[];
+    function formatOnClosingCurly(position: number, sourceFile: SourceFile, formatContext: FormatContext): TextChange[];
+    function formatDocument(sourceFile: SourceFile, formatContext: FormatContext): TextChange[];
+    function formatSelection(start: number, end: number, sourceFile: SourceFile, formatContext: FormatContext): TextChange[];
+    function formatNodeGivenIndentation(node: Node, sourceFileLike: SourceFileLike, languageVariant: LanguageVariant, initialIndentation: number, delta: number, formatContext: FormatContext): TextChange[];
+    /**
+     * @param precedingToken pass `null` if preceding token was already computed and result was `undefined`.
+     */
+    function getRangeOfEnclosingComment(sourceFile: SourceFile, position: number, onlyMultiLine: boolean, precedingToken?: Node | null, // tslint:disable-line:no-null-keyword
+    tokenAtPosition?: Node, predicate?: (c: CommentRange) => boolean): CommentRange | undefined;
+    function getIndentationString(indentation: number, options: EditorSettings): string;
+}
+declare namespace ts.formatting {
+    namespace SmartIndenter {
+        /**
+         * @param assumeNewLineBeforeCloseBrace
+         * `false` when called on text from a real source file.
+         * `true` when we need to assume `position` is on a newline.
+         *
+         * This is useful for codefixes. Consider
+         * ```
+         * function f() {
+         * |}
+         * ```
+         * with `position` at `|`.
+         *
+         * When inserting some text after an open brace, we would like to get indentation as if a newline was already there.
+         * By default indentation at `position` will be 0 so 'assumeNewLineBeforeCloseBrace' overrides this behavior.
+         */
+        function getIndentation(position: number, sourceFile: SourceFile, options: EditorSettings, assumeNewLineBeforeCloseBrace?: boolean): number;
+        function getIndentationForNode(n: Node, ignoreActualIndentationRange: TextRange, sourceFile: SourceFile, options: EditorSettings): number;
+        function getBaseIndentation(options: EditorSettings): number;
+        function isArgumentAndStartLineOverlapsExpressionBeingCalled(parent: Node, child: Node, childStartLine: number, sourceFile: SourceFileLike): boolean;
+        function childStartsOnTheSameLineWithElseInIfStatement(parent: Node, child: TextRangeWithKind, childStartLine: number, sourceFile: SourceFileLike): boolean;
+        function getContainingList(node: Node, sourceFile: SourceFile): NodeArray<Node> | undefined;
+        /**
+         * Character is the actual index of the character since the beginning of the line.
+         * Column - position of the character after expanding tabs to spaces.
+         * "0\t2$"
+         * value of 'character' for '$' is 3
+         * value of 'column' for '$' is 6 (assuming that tab size is 4)
+         */
+        function findFirstNonWhitespaceCharacterAndColumn(startPos: number, endPos: number, sourceFile: SourceFileLike, options: EditorSettings): {
+            column: number;
+            character: number;
+        };
+        function findFirstNonWhitespaceColumn(startPos: number, endPos: number, sourceFile: SourceFileLike, options: EditorSettings): number;
+        function nodeWillIndentChild(settings: FormatCodeSettings, parent: TextRangeWithKind, child: TextRangeWithKind | undefined, sourceFile: SourceFileLike | undefined, indentByDefault: boolean): boolean;
+        /**
+         * True when the parent node should indent the given child by an explicit rule.
+         * @param isNextChild If true, we are judging indent of a hypothetical child *after* this one, not the current child.
+         */
+        function shouldIndentChildNode(settings: FormatCodeSettings, parent: TextRangeWithKind, child?: Node, sourceFile?: SourceFileLike, isNextChild?: boolean): boolean;
+    }
+}
+declare namespace ts.textChanges {
+    interface ConfigurableStart {
+        /** True to use getStart() (NB, not getFullStart()) without adjustment. */
+        useNonAdjustedStartPosition?: boolean;
+    }
+    interface ConfigurableEnd {
+        /** True to use getEnd() without adjustment. */
+        useNonAdjustedEndPosition?: boolean;
+    }
+    enum Position {
+        FullStart = 0,
+        Start = 1
+    }
+    /**
+     * Usually node.pos points to a position immediately after the previous token.
+     * If this position is used as a beginning of the span to remove - it might lead to removing the trailing trivia of the previous node, i.e:
+     * const x; // this is x
+     *        ^ - pos for the next variable declaration will point here
+     * const y; // this is y
+     *        ^ - end for previous variable declaration
+     * Usually leading trivia of the variable declaration 'y' should not include trailing trivia (whitespace, comment 'this is x' and newline) from the preceding
+     * variable declaration and trailing trivia for 'y' should include (whitespace, comment 'this is y', newline).
+     * By default when removing nodes we adjust start and end positions to respect specification of the trivia above.
+     * If pos\end should be interpreted literally 'useNonAdjustedStartPosition' or 'useNonAdjustedEndPosition' should be set to true
+     */
+    interface ConfigurableStartEnd extends ConfigurableStart, ConfigurableEnd {
+    }
+    const useNonAdjustedPositions: ConfigurableStartEnd;
+    interface InsertNodeOptions {
+        /**
+         * Text to be inserted before the new node
+         */
+        prefix?: string;
+        /**
+         * Text to be inserted after the new node
+         */
+        suffix?: string;
+        /**
+         * Text of inserted node will be formatted with this indentation, otherwise indentation will be inferred from the old node
+         */
+        indentation?: number;
+        /**
+         * Text of inserted node will be formatted with this delta, otherwise delta will be inferred from the new node kind
+         */
+        delta?: number;
+        /**
+         * Do not trim leading white spaces in the edit range
+         */
+        preserveLeadingWhitespace?: boolean;
+    }
+    interface ReplaceWithMultipleNodesOptions extends InsertNodeOptions {
+        readonly joiner?: string;
+    }
+    interface ChangeNodeOptions extends ConfigurableStartEnd, InsertNodeOptions {
+    }
+    interface TextChangesContext {
+        host: LanguageServiceHost;
+        formatContext: formatting.FormatContext;
+    }
+    type TypeAnnotatable = SignatureDeclaration | VariableDeclaration | ParameterDeclaration | PropertyDeclaration | PropertySignature;
+    class ChangeTracker {
+        private readonly newLineCharacter;
+        private readonly formatContext;
+        private readonly changes;
+        private readonly newFiles;
+        private readonly deletedNodesInLists;
+        private readonly classesWithNodesInsertedAtStart;
+        static fromContext(context: TextChangesContext): ChangeTracker;
+        static with(context: TextChangesContext, cb: (tracker: ChangeTracker) => void): FileTextChanges[];
+        /** Public for tests only. Other callers should use `ChangeTracker.with`. */
+        constructor(newLineCharacter: string, formatContext: formatting.FormatContext);
+        deleteRange(sourceFile: SourceFile, range: TextRange): this;
+        /** Warning: This deletes comments too. See `copyComments` in `convertFunctionToEs6Class`. */
+        deleteNode(sourceFile: SourceFile, node: Node, options?: ConfigurableStartEnd): this;
+        deleteNodeRange(sourceFile: SourceFile, startNode: Node, endNode: Node, options?: ConfigurableStartEnd): this;
+        deleteNodeRangeExcludingEnd(sourceFile: SourceFile, startNode: Node, afterEndNode: Node | undefined, options?: ConfigurableStartEnd): void;
+        deleteNodeInList(sourceFile: SourceFile, node: Node): this;
+        replaceRange(sourceFile: SourceFile, range: TextRange, newNode: Node, options?: InsertNodeOptions): this;
+        replaceNode(sourceFile: SourceFile, oldNode: Node, newNode: Node, options?: ChangeNodeOptions): this;
+        replaceNodeRange(sourceFile: SourceFile, startNode: Node, endNode: Node, newNode: Node, options?: ChangeNodeOptions): void;
+        private replaceRangeWithNodes;
+        replaceNodeWithNodes(sourceFile: SourceFile, oldNode: Node, newNodes: ReadonlyArray<Node>, options?: ChangeNodeOptions): this;
+        replaceNodeRangeWithNodes(sourceFile: SourceFile, startNode: Node, endNode: Node, newNodes: ReadonlyArray<Node>, options?: ReplaceWithMultipleNodesOptions & ConfigurableStartEnd): this;
+        private nextCommaToken;
+        replacePropertyAssignment(sourceFile: SourceFile, oldNode: PropertyAssignment, newNode: PropertyAssignment): this;
+        private insertNodeAt;
+        private insertNodesAt;
+        insertNodeAtTopOfFile(sourceFile: SourceFile, newNode: Statement, blankLineBetween: boolean): void;
+        insertNodeBefore(sourceFile: SourceFile, before: Node, newNode: Node, blankLineBetween?: boolean): void;
+        insertModifierBefore(sourceFile: SourceFile, modifier: SyntaxKind, before: Node): void;
+        insertCommentBeforeLine(sourceFile: SourceFile, lineNumber: number, position: number, commentText: string): void;
+        replaceRangeWithText(sourceFile: SourceFile, range: TextRange, text: string): void;
+        private insertText;
+        /** Prefer this over replacing a node with another that has a type annotation, as it avoids reformatting the other parts of the node. */
+        tryInsertTypeAnnotation(sourceFile: SourceFile, node: TypeAnnotatable, type: TypeNode): void;
+        insertTypeParameters(sourceFile: SourceFile, node: SignatureDeclaration, typeParameters: ReadonlyArray<TypeParameterDeclaration>): void;
+        private getOptionsForInsertNodeBefore;
+        insertNodeAtConstructorStart(sourceFile: SourceFile, ctr: ConstructorDeclaration, newStatement: Statement): void;
+        insertNodeAtConstructorEnd(sourceFile: SourceFile, ctr: ConstructorDeclaration, newStatement: Statement): void;
+        private replaceConstructorBody;
+        insertNodeAtEndOfScope(sourceFile: SourceFile, scope: Node, newNode: Node): void;
+        insertNodeAtClassStart(sourceFile: SourceFile, cls: ClassLikeDeclaration, newElement: ClassElement): void;
+        private getInsertNodeAtClassStartPrefixSuffix;
+        insertNodeAfterComma(sourceFile: SourceFile, after: Node, newNode: Node): void;
+        insertNodeAfter(sourceFile: SourceFile, after: Node, newNode: Node): void;
+        insertNodesAfter(sourceFile: SourceFile, after: Node, newNodes: ReadonlyArray<Node>): void;
+        private insertNodeAfterWorker;
+        private getInsertNodeAfterOptions;
+        private getInsertNodeAfterOptionsWorker;
+        insertName(sourceFile: SourceFile, node: FunctionExpression | ClassExpression | ArrowFunction, name: string): void;
+        insertExportModifier(sourceFile: SourceFile, node: DeclarationStatement | VariableStatement): void;
+        /**
+         * This function should be used to insert nodes in lists when nodes don't carry separators as the part of the node range,
+         * i.e. arguments in arguments lists, parameters in parameter lists etc.
+         * Note that separators are part of the node in statements and class elements.
+         */
+        insertNodeInListAfter(sourceFile: SourceFile, after: Node, newNode: Node, containingList?: NodeArray<Node> | undefined): this;
+        private finishClassesWithNodesInsertedAtStart;
+        private finishTrailingCommaAfterDeletingNodesInList;
+        /**
+         * Note: after calling this, the TextChanges object must be discarded!
+         * @param validate only for tests
+         *    The reason we must validate as part of this method is that `getNonFormattedText` changes the node's positions,
+         *    so we can only call this once and can't get the non-formatted text separately.
+         */
+        getChanges(validate?: ValidateNonFormattedText): FileTextChanges[];
+        createNewFile(oldFile: SourceFile, fileName: string, statements: ReadonlyArray<Statement>): void;
+    }
+    type ValidateNonFormattedText = (node: Node, text: string) => void;
+    function applyChanges(text: string, changes: TextChange[]): string;
+    function isValidLocationToAddComment(sourceFile: SourceFile, position: number): boolean;
+}
+declare namespace ts {
+    interface CodeFixRegistration {
+        errorCodes: number[];
+        getCodeActions(context: CodeFixContext): CodeFixAction[] | undefined;
+        fixIds?: string[];
+        getAllCodeActions?(context: CodeFixAllContext): CombinedCodeActions;
+    }
+    interface CodeFixContextBase extends textChanges.TextChangesContext {
+        sourceFile: SourceFile;
+        program: Program;
+        cancellationToken: CancellationToken;
+        preferences: UserPreferences;
+    }
+    interface CodeFixAllContext extends CodeFixContextBase {
+        fixId: {};
+    }
+    interface CodeFixContext extends CodeFixContextBase {
+        errorCode: number;
+        span: TextSpan;
+    }
+    namespace codefix {
+        type DiagnosticAndArguments = DiagnosticMessage | [DiagnosticMessage, string] | [DiagnosticMessage, string, string];
+        function createCodeFixActionNoFixId(fixName: string, changes: FileTextChanges[], description: DiagnosticAndArguments): CodeFixAction;
+        function createCodeFixAction(fixName: string, changes: FileTextChanges[], description: DiagnosticAndArguments, fixId: {}, fixAllDescription: DiagnosticAndArguments, command?: CodeActionCommand): CodeFixAction;
+        function registerCodeFix(reg: CodeFixRegistration): void;
+        function getSupportedErrorCodes(): string[];
+        function getFixes(context: CodeFixContext): CodeFixAction[];
+        function getAllFixes(context: CodeFixAllContext): CombinedCodeActions;
+        function createFileTextChanges(fileName: string, textChanges: TextChange[]): FileTextChanges;
+        function codeFixAll(context: CodeFixAllContext, errorCodes: number[], use: (changes: textChanges.ChangeTracker, error: DiagnosticWithLocation, commands: Push<CodeActionCommand>) => void): CombinedCodeActions;
+    }
+}
+declare namespace ts {
+    interface Refactor {
+        /** Compute the associated code actions */
+        getEditsForAction(context: RefactorContext, actionName: string): RefactorEditInfo | undefined;
+        /** Compute (quickly) which actions are available here */
+        getAvailableActions(context: RefactorContext): ApplicableRefactorInfo[] | undefined;
+    }
+    interface RefactorContext extends textChanges.TextChangesContext {
+        file: SourceFile;
+        startPosition: number;
+        endPosition?: number;
+        program: Program;
+        cancellationToken?: CancellationToken;
+        preferences: UserPreferences;
+    }
+    namespace refactor {
+        /** @param name An unique code associated with each refactor. Does not have to be human-readable. */
+        function registerRefactor(name: string, refactor: Refactor): void;
+        function getApplicableRefactors(context: RefactorContext): ApplicableRefactorInfo[];
+        function getEditsForRefactor(context: RefactorContext, refactorName: string, actionName: string): RefactorEditInfo | undefined;
+    }
+    function getRefactorContextSpan({ startPosition, endPosition }: RefactorContext): TextSpan;
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+    type DeclarationWithType = FunctionLikeDeclaration | VariableDeclaration | PropertySignature | PropertyDeclaration;
+    function parameterShouldGetTypeFromJSDoc(node: Node): node is DeclarationWithType;
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+    function getImportCompletionAction(exportedSymbol: Symbol, moduleSymbol: Symbol, sourceFile: SourceFile, symbolName: string, host: LanguageServiceHost, program: Program, checker: TypeChecker, compilerOptions: CompilerOptions, allSourceFiles: ReadonlyArray<SourceFile>, formatContext: formatting.FormatContext, getCanonicalFileName: GetCanonicalFileName, symbolToken: Node | undefined, preferences: UserPreferences): {
+        readonly moduleSpecifier: string;
+        readonly codeAction: CodeAction;
+    };
+    function forEachExternalModuleToImportFrom(checker: TypeChecker, from: SourceFile, allSourceFiles: ReadonlyArray<SourceFile>, cb: (module: Symbol) => void): void;
+    function moduleSymbolToValidIdentifier(moduleSymbol: Symbol, target: ScriptTarget): string;
+    function moduleSpecifierToValidIdentifier(moduleSpecifier: string, target: ScriptTarget): string;
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+    /**
+     * Finds members of the resolved type that are missing in the class pointed to by class decl
+     * and generates source code for the missing members.
+     * @param possiblyMissingSymbols The collection of symbols to filter and then get insertions for.
+     * @returns Empty string iff there are no member insertions.
+     */
+    function createMissingMemberNodes(classDeclaration: ClassLikeDeclaration, possiblyMissingSymbols: ReadonlyArray<Symbol>, checker: TypeChecker, preferences: UserPreferences, out: (node: ClassElement) => void): void;
+    function createMethodFromCallExpression({ typeArguments, arguments: args, parent: parent }: CallExpression, methodName: string, inJs: boolean, makeStatic: boolean, preferences: UserPreferences): MethodDeclaration;
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.codefix {
+}
+declare namespace ts.refactor.generateGetAccessorAndSetAccessor {
+}
+declare namespace ts.refactor.extractSymbol {
+    /**
+     * Compute the associated code actions
+     * Exported for tests.
+     */
+    function getAvailableActions(context: RefactorContext): ApplicableRefactorInfo[] | undefined;
+    function getEditsForAction(context: RefactorContext, actionName: string): RefactorEditInfo | undefined;
+    namespace Messages {
+        const cannotExtractRange: DiagnosticMessage;
+        const cannotExtractImport: DiagnosticMessage;
+        const cannotExtractSuper: DiagnosticMessage;
+        const cannotExtractEmpty: DiagnosticMessage;
+        const expressionExpected: DiagnosticMessage;
+        const uselessConstantType: DiagnosticMessage;
+        const statementOrExpressionExpected: DiagnosticMessage;
+        const cannotExtractRangeContainingConditionalBreakOrContinueStatements: DiagnosticMessage;
+        const cannotExtractRangeContainingConditionalReturnStatement: DiagnosticMessage;
+        const cannotExtractRangeContainingLabeledBreakOrContinueStatementWithTargetOutsideOfTheRange: DiagnosticMessage;
+        const cannotExtractRangeThatContainsWritesToReferencesLocatedOutsideOfTheTargetRangeInGenerators: DiagnosticMessage;
+        const typeWillNotBeVisibleInTheNewScope: DiagnosticMessage;
+        const functionWillNotBeVisibleInTheNewScope: DiagnosticMessage;
+        const cannotExtractIdentifier: DiagnosticMessage;
+        const cannotExtractExportedEntity: DiagnosticMessage;
+        const cannotWriteInExpression: DiagnosticMessage;
+        const cannotExtractReadonlyPropertyInitializerOutsideConstructor: DiagnosticMessage;
+        const cannotExtractAmbientBlock: DiagnosticMessage;
+        const cannotAccessVariablesFromNestedScopes: DiagnosticMessage;
+        const cannotExtractToOtherFunctionLike: DiagnosticMessage;
+        const cannotExtractToJSClass: DiagnosticMessage;
+        const cannotExtractToExpressionArrowFunction: DiagnosticMessage;
+    }
+    enum RangeFacts {
+        None = 0,
+        HasReturn = 1,
+        IsGenerator = 2,
+        IsAsyncFunction = 4,
+        UsesThis = 8,
+        /**
+         * The range is in a function which needs the 'static' modifier in a class
+         */
+        InStaticRegion = 16
+    }
+    /**
+     * Represents an expression or a list of statements that should be extracted with some extra information
+     */
+    interface TargetRange {
+        readonly range: Expression | Statement[];
+        readonly facts: RangeFacts;
+        /**
+         * A list of symbols that are declared in the selected range which are visible in the containing lexical scope
+         * Used to ensure we don't turn something used outside the range free (or worse, resolve to a different entity).
+         */
+        readonly declarations: Symbol[];
+    }
+    /**
+     * Result of 'getRangeToExtract' operation: contains either a range or a list of errors
+     */
+    type RangeToExtract = {
+        readonly targetRange?: never;
+        readonly errors: ReadonlyArray<Diagnostic>;
+    } | {
+        readonly targetRange: TargetRange;
+        readonly errors?: never;
+    };
+    /**
+     * getRangeToExtract takes a span inside a text file and returns either an expression or an array
+     * of statements representing the minimum set of nodes needed to extract the entire span. This
+     * process may fail, in which case a set of errors is returned instead (these are currently
+     * not shown to the user, but can be used by us diagnostically)
+     */
+    function getRangeToExtract(sourceFile: SourceFile, span: TextSpan): RangeToExtract;
+}
+declare namespace ts.refactor.generateGetAccessorAndSetAccessor {
+}
+declare namespace ts.refactor {
+}
+declare namespace ts.sourcemaps {
+    interface SourceMapData {
+        version?: number;
+        file?: string;
+        sourceRoot?: string;
+        sources: string[];
+        sourcesContent?: string[];
+        names?: string[];
+        mappings: string;
+    }
+    interface SourceMappableLocation {
+        fileName: string;
+        position: number;
+    }
+    interface SourceMapper {
+        getOriginalPosition(input: SourceMappableLocation): SourceMappableLocation;
+        getGeneratedPosition(input: SourceMappableLocation): SourceMappableLocation;
+    }
+    const identitySourceMapper: {
+        getOriginalPosition: typeof identity;
+        getGeneratedPosition: typeof identity;
+    };
+    interface SourceMapDecodeHost {
+        readFile(path: string): string | undefined;
+        fileExists(path: string): boolean;
+        getCanonicalFileName(path: string): string;
+        log(text: string): void;
+    }
+    function decode(host: SourceMapDecodeHost, mapPath: string, map: SourceMapData, program?: Program, fallbackCache?: SourceFileLikeCache): SourceMapper;
+}
+declare namespace ts {
+    /** The version of the language service API */
+    const servicesVersion = "0.8";
+    interface DisplayPartsSymbolWriter extends EmitTextWriter {
+        displayParts(): SymbolDisplayPart[];
+    }
+    function toEditorSettings(options: FormatCodeOptions | FormatCodeSettings): FormatCodeSettings;
+    function toEditorSettings(options: EditorOptions | EditorSettings): EditorSettings;
+    function displayPartsToString(displayParts: SymbolDisplayPart[] | undefined): string;
+    function getDefaultCompilerOptions(): CompilerOptions;
+    function getSupportedCodeFixes(): string[];
+    function createLanguageServiceSourceFile(fileName: string, scriptSnapshot: IScriptSnapshot, scriptTarget: ScriptTarget, version: string, setNodeParents: boolean, scriptKind?: ScriptKind): SourceFile;
+    let disableIncrementalParsing: boolean;
+    function updateLanguageServiceSourceFile(sourceFile: SourceFile, scriptSnapshot: IScriptSnapshot, version: string, textChangeRange: TextChangeRange | undefined, aggressiveChecks?: boolean): SourceFile;
+    /** A cancellation that throttles calls to the host */
+    class ThrottledCancellationToken implements CancellationToken {
+        private hostCancellationToken;
+        private readonly throttleWaitMilliseconds;
+        private lastCancellationCheckTime;
+        constructor(hostCancellationToken: HostCancellationToken, throttleWaitMilliseconds?: number);
+        isCancellationRequested(): boolean;
+        throwIfCancellationRequested(): void;
+    }
+    interface SourceFileLikeCache {
+        get(path: Path): SourceFileLike | undefined;
+    }
+    function createSourceFileLikeCache(host: {
+        readFile?: (path: string) => string | undefined;
+        fileExists?: (path: string) => boolean;
+    }): SourceFileLikeCache;
+    function createLanguageService(host: LanguageServiceHost, documentRegistry?: DocumentRegistry, syntaxOnly?: boolean): LanguageService;
+    /** Names in the name table are escaped, so an identifier `__foo` will have a name table entry `___foo`. */
+    function getNameTable(sourceFile: SourceFile): UnderscoreEscapedMap<number>;
+    /**
+     * Returns the containing object literal property declaration given a possible name node, e.g. "a" in x = { "a": 1 }
+     */
+    function getContainingObjectLiteralElement(node: Node): ObjectLiteralElement | undefined;
+    function getPropertySymbolsFromContextualType(typeChecker: TypeChecker, node: ObjectLiteralElement): Symbol[];
+    function getPropertySymbolsFromType(type: Type, propName: PropertyName): Symbol[] | undefined;
+    /**
+     * Get the path of the default library files (lib.d.ts) as distributed with the typescript
+     * node package.
+     * The functionality is not supported if the ts module is consumed outside of a node module.
+     */
+    function getDefaultLibFilePath(options: CompilerOptions): string;
+}
+declare namespace ts.BreakpointResolver {
+    /**
+     * Get the breakpoint span in given sourceFile
+     */
+    function spanInSourceFileAtLocation(sourceFile: SourceFile, position: number): TextSpan | undefined;
+}
+declare namespace ts {
+    /**
+     * Transform one or more nodes using the supplied transformers.
+     * @param source A single `Node` or an array of `Node` objects.
+     * @param transformers An array of `TransformerFactory` callbacks used to process the transformation.
+     * @param compilerOptions Optional compiler options.
+     */
+    function transform<T extends Node>(source: T | T[], transformers: TransformerFactory<T>[], compilerOptions?: CompilerOptions): TransformationResult<T>;
+}
+declare let debugObjectHost: {
+    CollectGarbage(): void;
+};
+declare namespace ts {
+    interface ScriptSnapshotShim {
+        /** Gets a portion of the script snapshot specified by [start, end). */
+        getText(start: number, end: number): string;
+        /** Gets the length of this script snapshot. */
+        getLength(): number;
+        /**
+         * Returns a JSON-encoded value of the type:
+         *   { span: { start: number; length: number }; newLength: number }
+         *
+         * Or undefined value if there was no change.
+         */
+        getChangeRange(oldSnapshot: ScriptSnapshotShim): string | undefined;
+        /** Releases all resources held by this script snapshot */
+        dispose?(): void;
+    }
+    interface Logger {
+        log(s: string): void;
+        trace(s: string): void;
+        error(s: string): void;
+    }
+    /** Public interface of the host of a language service shim instance. */
+    interface LanguageServiceShimHost extends Logger {
+        getCompilationSettings(): string;
+        /** Returns a JSON-encoded value of the type: string[] */
+        getScriptFileNames(): string;
+        getScriptKind?(fileName: string): ScriptKind;
+        getScriptVersion(fileName: string): string;
+        getScriptSnapshot(fileName: string): ScriptSnapshotShim;
+        getLocalizedDiagnosticMessages(): string;
+        getCancellationToken(): HostCancellationToken;
+        getCurrentDirectory(): string;
+        getDirectories(path: string): string;
+        getDefaultLibFileName(options: string): string;
+        getNewLine?(): string;
+        getProjectVersion?(): string;
+        useCaseSensitiveFileNames?(): boolean;
+        getTypeRootsVersion?(): number;
+        readDirectory(rootDir: string, extension: string, basePaths?: string, excludeEx?: string, includeFileEx?: string, includeDirEx?: string, depth?: number): string;
+        readFile(path: string, encoding?: string): string | undefined;
+        fileExists(path: string): boolean;
+        getModuleResolutionsForFile?(fileName: string): string;
+        getTypeReferenceDirectiveResolutionsForFile?(fileName: string): string;
+        directoryExists(directoryName: string): boolean;
+    }
+    /** Public interface of the core-services host instance used in managed side */
+    interface CoreServicesShimHost extends Logger {
+        directoryExists(directoryName: string): boolean;
+        fileExists(fileName: string): boolean;
+        getCurrentDirectory(): string;
+        getDirectories(path: string): string;
+        /**
+         * Returns a JSON-encoded value of the type: string[]
+         *
+         * @param exclude A JSON encoded string[] containing the paths to exclude
+         *  when enumerating the directory.
+         */
+        readDirectory(rootDir: string, extension: string, basePaths?: string, excludeEx?: string, includeFileEx?: string, includeDirEx?: string, depth?: number): string;
+        /**
+         * Read arbitary text files on disk, i.e. when resolution procedure needs the content of 'package.json' to determine location of bundled typings for node modules
+         */
+        readFile(fileName: string): string | undefined;
+        realpath?(path: string): string;
+        trace(s: string): void;
+        useCaseSensitiveFileNames?(): boolean;
+    }
+    interface ShimsFileReference {
+        path: string;
+        position: number;
+        length: number;
+    }
+    /** Public interface of a language service instance shim. */
+    interface ShimFactory {
+        registerShim(shim: Shim): void;
+        unregisterShim(shim: Shim): void;
+    }
+    interface Shim {
+        dispose(_dummy: {}): void;
+    }
+    interface LanguageServiceShim extends Shim {
+        languageService: LanguageService;
+        dispose(_dummy: {}): void;
+        refresh(throwOnError: boolean): void;
+        cleanupSemanticCache(): void;
+        getSyntacticDiagnostics(fileName: string): string;
+        getSemanticDiagnostics(fileName: string): string;
+        getSuggestionDiagnostics(fileName: string): string;
+        getCompilerOptionsDiagnostics(): string;
+        getSyntacticClassifications(fileName: string, start: number, length: number): string;
+        getSemanticClassifications(fileName: string, start: number, length: number): string;
+        getEncodedSyntacticClassifications(fileName: string, start: number, length: number): string;
+        getEncodedSemanticClassifications(fileName: string, start: number, length: number): string;
+        getCompletionsAtPosition(fileName: string, position: number, preferences: UserPreferences | undefined): string;
+        getCompletionEntryDetails(fileName: string, position: number, entryName: string, formatOptions: string | undefined, source: string | undefined, preferences: UserPreferences | undefined): string;
+        getQuickInfoAtPosition(fileName: string, position: number): string;
+        getNameOrDottedNameSpan(fileName: string, startPos: number, endPos: number): string;
+        getBreakpointStatementAtPosition(fileName: string, position: number): string;
+        getSignatureHelpItems(fileName: string, position: number): string;
+        /**
+         * Returns a JSON-encoded value of the type:
+         * { canRename: boolean, localizedErrorMessage: string, displayName: string, fullDisplayName: string, kind: string, kindModifiers: string, triggerSpan: { start; length } }
+         */
+        getRenameInfo(fileName: string, position: number): string;
+        /**
+         * Returns a JSON-encoded value of the type:
+         * { fileName: string, textSpan: { start: number, length: number } }[]
+         */
+        findRenameLocations(fileName: string, position: number, findInStrings: boolean, findInComments: boolean): string;
+        /**
+         * Returns a JSON-encoded value of the type:
+         * { fileName: string; textSpan: { start: number; length: number}; kind: string; name: string; containerKind: string; containerName: string }
+         *
+         * Or undefined value if no definition can be found.
+         */
+        getDefinitionAtPosition(fileName: string, position: number): string;
+        getDefinitionAndBoundSpan(fileName: string, position: number): string;
+        /**
+         * Returns a JSON-encoded value of the type:
+         * { fileName: string; textSpan: { start: number; length: number}; kind: string; name: string; containerKind: string; containerName: string }
+         *
+         * Or undefined value if no definition can be found.
+         */
+        getTypeDefinitionAtPosition(fileName: string, position: number): string;
+        /**
+         * Returns a JSON-encoded value of the type:
+         * { fileName: string; textSpan: { start: number; length: number}; }[]
+         */
+        getImplementationAtPosition(fileName: string, position: number): string;
+        /**
+         * Returns a JSON-encoded value of the type:
+         * { fileName: string; textSpan: { start: number; length: number}; isWriteAccess: boolean, isDefinition?: boolean }[]
+         */
+        getReferencesAtPosition(fileName: string, position: number): string;
+        /**
+         * Returns a JSON-encoded value of the type:
+         * { definition: <encoded>; references: <encoded>[] }[]
+         */
+        findReferences(fileName: string, position: number): string;
+        /**
+         * @deprecated
+         * Returns a JSON-encoded value of the type:
+         * { fileName: string; textSpan: { start: number; length: number}; isWriteAccess: boolean }[]
+         */
+        getOccurrencesAtPosition(fileName: string, position: number): string;
+        /**
+         * Returns a JSON-encoded value of the type:
+         * { fileName: string; highlights: { start: number; length: number, isDefinition: boolean }[] }[]
+         *
+         * @param fileToSearch A JSON encoded string[] containing the file names that should be
+         *  considered when searching.
+         */
+        getDocumentHighlights(fileName: string, position: number, filesToSearch: string): string;
+        /**
+         * Returns a JSON-encoded value of the type:
+         * { name: string; kind: string; kindModifiers: string; containerName: string; containerKind: string; matchKind: string; fileName: string; textSpan: { start: number; length: number}; } [] = [];
+         */
+        getNavigateToItems(searchValue: string, maxResultCount?: number, fileName?: string): string;
+        /**
+         * Returns a JSON-encoded value of the type:
+         * { text: string; kind: string; kindModifiers: string; bolded: boolean; grayed: boolean; indent: number; spans: { start: number; length: number; }[]; childItems: <recursive use of this type>[] } [] = [];
+         */
+        getNavigationBarItems(fileName: string): string;
+        /** Returns a JSON-encoded value of the type ts.NavigationTree. */
+        getNavigationTree(fileName: string): string;
+        /**
+         * Returns a JSON-encoded value of the type:
+         * { textSpan: { start: number, length: number }; hintSpan: { start: number, length: number }; bannerText: string; autoCollapse: boolean } [] = [];
+         */
+        getOutliningSpans(fileName: string): string;
+        getTodoComments(fileName: string, todoCommentDescriptors: string): string;
+        getBraceMatchingAtPosition(fileName: string, position: number): string;
+        getIndentationAtPosition(fileName: string, position: number, options: string): string;
+        getFormattingEditsForRange(fileName: string, start: number, end: number, options: string): string;
+        getFormattingEditsForDocument(fileName: string, options: string): string;
+        getFormattingEditsAfterKeystroke(fileName: string, position: number, key: string, options: string): string;
+        /**
+         * Returns JSON-encoded value of the type TextInsertion.
+         */
+        getDocCommentTemplateAtPosition(fileName: string, position: number): string;
+        /**
+         * Returns JSON-encoded boolean to indicate whether we should support brace location
+         * at the current position.
+         * E.g. we don't want brace completion inside string-literals, comments, etc.
+         */
+        isValidBraceCompletionAtPosition(fileName: string, position: number, openingBrace: number): string;
+        /**
+         * Returns a JSON-encoded TextSpan | undefined indicating the range of the enclosing comment, if it exists.
+         */
+        getSpanOfEnclosingComment(fileName: string, position: number, onlyMultiLine: boolean): string;
+        getEmitOutput(fileName: string): string;
+        getEmitOutputObject(fileName: string): EmitOutput;
+    }
+    interface ClassifierShim extends Shim {
+        getEncodedLexicalClassifications(text: string, lexState: EndOfLineState, syntacticClassifierAbsent?: boolean): string;
+        getClassificationsForLine(text: string, lexState: EndOfLineState, syntacticClassifierAbsent?: boolean): string;
+    }
+    interface CoreServicesShim extends Shim {
+        getAutomaticTypeDirectiveNames(compilerOptionsJson: string): string;
+        getPreProcessedFileInfo(fileName: string, sourceText: IScriptSnapshot): string;
+        getTSConfigFileInfo(fileName: string, sourceText: IScriptSnapshot): string;
+        getDefaultCompilationSettings(): string;
+        discoverTypings(discoverTypingsJson: string): string;
+    }
+    class LanguageServiceShimHostAdapter implements LanguageServiceHost {
+        private shimHost;
+        private files;
+        private loggingEnabled;
+        private tracingEnabled;
+        resolveModuleNames: (moduleName: string[], containingFile: string) => ResolvedModuleFull[];
+        resolveTypeReferenceDirectives: (typeDirectiveNames: string[], containingFile: string) => ResolvedTypeReferenceDirective[];
+        directoryExists: (directoryName: string) => boolean;
+        constructor(shimHost: LanguageServiceShimHost);
+        log(s: string): void;
+        trace(s: string): void;
+        error(s: string): void;
+        getProjectVersion(): string;
+        getTypeRootsVersion(): number;
+        useCaseSensitiveFileNames(): boolean;
+        getCompilationSettings(): CompilerOptions;
+        getScriptFileNames(): string[];
+        getScriptSnapshot(fileName: string): IScriptSnapshot | undefined;
+        getScriptKind(fileName: string): ScriptKind;
+        getScriptVersion(fileName: string): string;
+        getLocalizedDiagnosticMessages(): any;
+        getCancellationToken(): HostCancellationToken;
+        getCurrentDirectory(): string;
+        getDirectories(path: string): string[];
+        getDefaultLibFileName(options: CompilerOptions): string;
+        readDirectory(path: string, extensions?: ReadonlyArray<string>, exclude?: string[], include?: string[], depth?: number): string[];
+        readFile(path: string, encoding?: string): string | undefined;
+        fileExists(path: string): boolean;
+    }
+    class CoreServicesShimHostAdapter implements ParseConfigHost, ModuleResolutionHost, JsTyping.TypingResolutionHost {
+        private shimHost;
+        directoryExists: (directoryName: string) => boolean;
+        realpath: (path: string) => string;
+        useCaseSensitiveFileNames: boolean;
+        constructor(shimHost: CoreServicesShimHost);
+        readDirectory(rootDir: string, extensions: ReadonlyArray<string>, exclude: ReadonlyArray<string>, include: ReadonlyArray<string>, depth?: number): string[];
+        fileExists(fileName: string): boolean;
+        readFile(fileName: string): string | undefined;
+        getDirectories(path: string): string[];
+    }
+    interface RealizedDiagnostic {
+        message: string;
+        start: number;
+        length: number;
+        category: string;
+        code: number;
+        reportsUnnecessary?: {};
+    }
+    function realizeDiagnostics(diagnostics: ReadonlyArray<Diagnostic>, newLine: string): RealizedDiagnostic[];
+    class TypeScriptServicesFactory implements ShimFactory {
+        private _shims;
+        private documentRegistry;
+        getServicesVersion(): string;
+        createLanguageServiceShim(host: LanguageServiceShimHost): LanguageServiceShim;
+        createClassifierShim(logger: Logger): ClassifierShim;
+        createCoreServicesShim(host: CoreServicesShimHost): CoreServicesShim;
+        close(): void;
+        registerShim(shim: Shim): void;
+        unregisterShim(shim: Shim): void;
+    }
+}
+declare namespace TypeScript.Services {
+    const TypeScriptServicesFactory: typeof ts.TypeScriptServicesFactory;
+}
+declare const toolsVersion = "3.0";
+//# sourceMappingURL=services.d.ts.map
+declare namespace ts.server {
+    const ActionSet: ActionSet;
+    const ActionInvalidate: ActionInvalidate;
+    const ActionPackageInstalled: ActionPackageInstalled;
+    const EventTypesRegistry: EventTypesRegistry;
+    const EventBeginInstallTypes: EventBeginInstallTypes;
+    const EventEndInstallTypes: EventEndInstallTypes;
+    const EventInitializationFailed: EventInitializationFailed;
+    namespace Arguments {
+        const GlobalCacheLocation = "--globalTypingsCacheLocation";
+        const LogFile = "--logFile";
+        const EnableTelemetry = "--enableTelemetry";
+        const TypingSafeListLocation = "--typingSafeListLocation";
+        const TypesMapLocation = "--typesMapLocation";
+        /**
+         * This argument specifies the location of the NPM executable.
+         * typingsInstaller will run the command with `${npmLocation} install ...`.
+         */
+        const NpmLocation = "--npmLocation";
+    }
+    function hasArgument(argumentName: string): boolean;
+    function findArgument(argumentName: string): string | undefined;
+    function nowString(): string;
+}
+declare namespace ts.server {
+    type ActionSet = "action::set";
+    type ActionInvalidate = "action::invalidate";
+    type ActionPackageInstalled = "action::packageInstalled";
+    type EventTypesRegistry = "event::typesRegistry";
+    type EventBeginInstallTypes = "event::beginInstallTypes";
+    type EventEndInstallTypes = "event::endInstallTypes";
+    type EventInitializationFailed = "event::initializationFailed";
+    interface SortedReadonlyArray<T> extends ReadonlyArray<T> {
+        " __sortedArrayBrand": any;
+    }
+    interface TypingInstallerResponse {
+        readonly kind: ActionSet | ActionInvalidate | EventTypesRegistry | ActionPackageInstalled | EventBeginInstallTypes | EventEndInstallTypes | EventInitializationFailed;
+    }
+    interface TypingInstallerRequestWithProjectName {
+        readonly projectName: string;
+    }
+    type TypingInstallerRequestUnion = DiscoverTypings | CloseProject | TypesRegistryRequest | InstallPackageRequest;
+    interface DiscoverTypings extends TypingInstallerRequestWithProjectName {
+        readonly fileNames: string[];
+        readonly projectRootPath: Path;
+        readonly compilerOptions: CompilerOptions;
+        readonly typeAcquisition: TypeAcquisition;
+        readonly unresolvedImports: SortedReadonlyArray<string>;
+        readonly cachePath?: string;
+        readonly kind: "discover";
+    }
+    interface CloseProject extends TypingInstallerRequestWithProjectName {
+        readonly kind: "closeProject";
+    }
+    interface TypesRegistryRequest {
+        readonly kind: "typesRegistry";
+    }
+    interface InstallPackageRequest extends TypingInstallerRequestWithProjectName {
+        readonly kind: "installPackage";
+        readonly fileName: Path;
+        readonly packageName: string;
+        readonly projectRootPath: Path;
+    }
+    interface TypesRegistryResponse extends TypingInstallerResponse {
+        readonly kind: EventTypesRegistry;
+        readonly typesRegistry: MapLike<MapLike<string>>;
+    }
+    interface PackageInstalledResponse extends ProjectResponse {
+        readonly kind: ActionPackageInstalled;
+        readonly success: boolean;
+        readonly message: string;
+    }
+    interface InitializationFailedResponse extends TypingInstallerResponse {
+        readonly kind: EventInitializationFailed;
+        readonly message: string;
+    }
+    interface ProjectResponse extends TypingInstallerResponse {
+        readonly projectName: string;
+    }
+    interface InvalidateCachedTypings extends ProjectResponse {
+        readonly kind: ActionInvalidate;
+    }
+    interface InstallTypes extends ProjectResponse {
+        readonly kind: EventBeginInstallTypes | EventEndInstallTypes;
+        readonly eventId: number;
+        readonly typingsInstallerVersion: string;
+        readonly packagesToInstall: ReadonlyArray<string>;
+    }
+    interface BeginInstallTypes extends InstallTypes {
+        readonly kind: EventBeginInstallTypes;
+    }
+    interface EndInstallTypes extends InstallTypes {
+        readonly kind: EventEndInstallTypes;
+        readonly installSuccess: boolean;
+    }
+    interface InstallTypingHost extends JsTyping.TypingResolutionHost {
+        useCaseSensitiveFileNames: boolean;
+        writeFile(path: string, content: string): void;
+        createDirectory(path: string): void;
+        watchFile?(path: string, callback: FileWatcherCallback, pollingInterval?: number): FileWatcher;
+        watchDirectory?(path: string, callback: DirectoryWatcherCallback, recursive?: boolean): FileWatcher;
+    }
+    interface SetTypings extends ProjectResponse {
+        readonly typeAcquisition: TypeAcquisition;
+        readonly compilerOptions: CompilerOptions;
+        readonly typings: string[];
+        readonly unresolvedImports: SortedReadonlyArray<string>;
+        readonly kind: ActionSet;
+    }
+    type TypingInstallerResponseUnion = SetTypings | InvalidateCachedTypings | TypesRegistryResponse | PackageInstalledResponse | InstallTypes | InitializationFailedResponse;
+}
+declare namespace ts.JsTyping {
+    interface TypingResolutionHost {
+        directoryExists(path: string): boolean;
+        fileExists(fileName: string): boolean;
+        readFile(path: string, encoding?: string): string | undefined;
+        readDirectory(rootDir: string, extensions: ReadonlyArray<string>, excludes: ReadonlyArray<string> | undefined, includes: ReadonlyArray<string> | undefined, depth?: number): string[];
+    }
+    interface CachedTyping {
+        typingLocation: string;
+        version: Semver;
+    }
+    function isTypingUpToDate(cachedTyping: CachedTyping, availableTypingVersions: MapLike<string>): boolean;
+    const nodeCoreModuleList: ReadonlyArray<string>;
+    const nodeCoreModules: Map<true>;
+    /**
+     * A map of loose file names to library names that we are confident require typings
+     */
+    type SafeList = ReadonlyMap<string>;
+    function loadSafeList(host: TypingResolutionHost, safeListPath: Path): SafeList;
+    function loadTypesMap(host: TypingResolutionHost, typesMapPath: Path): SafeList | undefined;
+    /**
+     * @param host is the object providing I/O related operations.
+     * @param fileNames are the file names that belong to the same project
+     * @param projectRootPath is the path to the project root directory
+     * @param safeListPath is the path used to retrieve the safe list
+     * @param packageNameToTypingLocation is the map of package names to their cached typing locations and installed versions
+     * @param typeAcquisition is used to customize the typing acquisition process
+     * @param compilerOptions are used as a source for typing inference
+     */
+    function discoverTypings(host: TypingResolutionHost, log: ((message: string) => void) | undefined, fileNames: string[], projectRootPath: Path, safeList: SafeList, packageNameToTypingLocation: ReadonlyMap<CachedTyping>, typeAcquisition: TypeAcquisition, unresolvedImports: ReadonlyArray<string>, typesRegistry: ReadonlyMap<MapLike<string>>): {
+        cachedTypingPaths: string[];
+        newTypingNames: string[];
+        filesToWatch: string[];
+    };
+    enum PackageNameValidationResult {
+        Ok = 0,
+        ScopedPackagesNotSupported = 1,
+        EmptyName = 2,
+        NameTooLong = 3,
+        NameStartsWithDot = 4,
+        NameStartsWithUnderscore = 5,
+        NameContainsNonURISafeCharacters = 6
+    }
+    /**
+     * Validates package name using rules defined at https://docs.npmjs.com/files/package.json
+     */
+    function validatePackageName(packageName: string): PackageNameValidationResult;
+    function renderPackageNameValidationFailure(result: PackageNameValidationResult, typing: string): string;
+}
+declare namespace ts {
+    class Semver {
+        readonly major: number;
+        readonly minor: number;
+        readonly patch: number;
+        /**
+         * If true, this is `major.minor.0-next.patch`.
+         * If false, this is `major.minor.patch`.
+         */
+        readonly isPrerelease: boolean;
+        static parse(semver: string): Semver;
+        static fromRaw({ major, minor, patch, isPrerelease }: Semver): Semver;
+        private static tryParse;
+        private constructor();
+        readonly versionString: string;
+        equals(sem: Semver): boolean;
+        greaterThan(sem: Semver): boolean;
+    }
+}
+//# sourceMappingURL=jsTyping.d.ts.map
+declare namespace ts.server {
+    interface CompressedData {
+        length: number;
+        compressionKind: string;
+        data: any;
+    }
+    type RequireResult = {
+        module: {};
+        error: undefined;
+    } | {
+        module: undefined;
+        error: {
+            stack?: string;
+            message?: string;
+        };
+    };
+    interface ServerHost extends System {
+        watchFile(path: string, callback: FileWatcherCallback, pollingInterval?: number): FileWatcher;
+        watchDirectory(path: string, callback: DirectoryWatcherCallback, recursive?: boolean): FileWatcher;
+        setTimeout(callback: (...args: any[]) => void, ms: number, ...args: any[]): any;
+        clearTimeout(timeoutId: any): void;
+        setImmediate(callback: (...args: any[]) => void, ...args: any[]): any;
+        clearImmediate(timeoutId: any): void;
+        gc?(): void;
+        trace?(s: string): void;
+        require?(initialPath: string, moduleName: string): RequireResult;
+    }
+}
+declare namespace ts.server {
+    enum LogLevel {
+        terse = 0,
+        normal = 1,
+        requestTime = 2,
+        verbose = 3
+    }
+    const emptyArray: SortedReadonlyArray<never>;
+    interface Logger {
+        close(): void;
+        hasLevel(level: LogLevel): boolean;
+        loggingEnabled(): boolean;
+        perftrc(s: string): void;
+        info(s: string): void;
+        startGroup(): void;
+        endGroup(): void;
+        msg(s: string, type?: Msg): void;
+        getLogFileName(): string | undefined;
+    }
+    enum Msg {
+        Err = "Err",
+        Info = "Info",
+        Perf = "Perf"
+    }
+    namespace Msg {
+        type Types = Msg;
+    }
+    function createInstallTypingsRequest(project: Project, typeAcquisition: TypeAcquisition, unresolvedImports: SortedReadonlyArray<string>, cachePath?: string): DiscoverTypings;
+    namespace Errors {
+        function ThrowNoProject(): never;
+        function ThrowProjectLanguageServiceDisabled(): never;
+        function ThrowProjectDoesNotContainDocument(fileName: string, project: Project): never;
+    }
+    function getDefaultFormatCodeSettings(host: ServerHost): FormatCodeSettings;
+    type NormalizedPath = string & {
+        __normalizedPathTag: any;
+    };
+    function toNormalizedPath(fileName: string): NormalizedPath;
+    function normalizedPathToPath(normalizedPath: NormalizedPath, currentDirectory: string, getCanonicalFileName: (f: string) => string): Path;
+    function asNormalizedPath(fileName: string): NormalizedPath;
+    interface NormalizedPathMap<T> {
+        get(path: NormalizedPath): T | undefined;
+        set(path: NormalizedPath, value: T): void;
+        contains(path: NormalizedPath): boolean;
+        remove(path: NormalizedPath): void;
+    }
+    function createNormalizedPathMap<T>(): NormalizedPathMap<T>;
+    interface ProjectOptions {
+        configHasExtendsProperty: boolean;
+        configHasFilesProperty: boolean;
+        configHasIncludeProperty: boolean;
+        configHasExcludeProperty: boolean;
+        projectReferences: ReadonlyArray<ProjectReference> | undefined;
+        files?: string[];
+        wildcardDirectories?: Map<WatchDirectoryFlags>;
+        compilerOptions?: CompilerOptions;
+        typeAcquisition?: TypeAcquisition;
+        compileOnSave?: boolean;
+    }
+    function isInferredProjectName(name: string): boolean;
+    function makeInferredProjectName(counter: number): string;
+    function createSortedArray<T>(): SortedArray<T>;
+}
+declare namespace ts.server {
+    class ThrottledOperations {
+        private readonly host;
+        private readonly pendingTimeouts;
+        private readonly logger?;
+        constructor(host: ServerHost, logger: Logger);
+        schedule(operationId: string, delay: number, cb: () => void): void;
+        private static run;
+    }
+    class GcTimer {
+        private readonly host;
+        private readonly delay;
+        private readonly logger;
+        private timerId;
+        constructor(host: ServerHost, delay: number, logger: Logger);
+        scheduleCollect(): void;
+        private static run;
+    }
+    function getBaseConfigFileName(configFilePath: NormalizedPath): "tsconfig.json" | "jsconfig.json" | undefined;
+    function removeSorted<T>(array: SortedArray<T>, remove: T, compare: Comparer<T>): void;
+    function toSortedArray(arr: string[]): SortedArray<string>;
+    function toSortedArray<T>(arr: T[], comparer: Comparer<T>): SortedArray<T>;
+    function toDeduplicatedSortedArray(arr: string[]): SortedArray<string>;
+    function indent(str: string): string;
+    function stringifyIndented(json: {}): string;
+}
+declare namespace ts.server.protocol {
+    enum CommandTypes {
+        JsxClosingTag = "jsxClosingTag",
+        Brace = "brace",
+        BraceFull = "brace-full",
+        BraceCompletion = "braceCompletion",
+        GetSpanOfEnclosingComment = "getSpanOfEnclosingComment",
+        Change = "change",
+        Close = "close",
+        Completions = "completions",
+        CompletionsFull = "completions-full",
+        CompletionDetails = "completionEntryDetails",
+        CompletionDetailsFull = "completionEntryDetails-full",
+        CompileOnSaveAffectedFileList = "compileOnSaveAffectedFileList",
+        CompileOnSaveEmitFile = "compileOnSaveEmitFile",
+        Configure = "configure",
+        Definition = "definition",
+        DefinitionFull = "definition-full",
+        DefinitionAndBoundSpan = "definitionAndBoundSpan",
+        DefinitionAndBoundSpanFull = "definitionAndBoundSpan-full",
+        Implementation = "implementation",
+        ImplementationFull = "implementation-full",
+        Exit = "exit",
+        Format = "format",
+        Formatonkey = "formatonkey",
+        FormatFull = "format-full",
+        FormatonkeyFull = "formatonkey-full",
+        FormatRangeFull = "formatRange-full",
+        Geterr = "geterr",
+        GeterrForProject = "geterrForProject",
+        SemanticDiagnosticsSync = "semanticDiagnosticsSync",
+        SyntacticDiagnosticsSync = "syntacticDiagnosticsSync",
+        SuggestionDiagnosticsSync = "suggestionDiagnosticsSync",
+        NavBar = "navbar",
+        NavBarFull = "navbar-full",
+        Navto = "navto",
+        NavtoFull = "navto-full",
+        NavTree = "navtree",
+        NavTreeFull = "navtree-full",
+        Occurrences = "occurrences",
+        DocumentHighlights = "documentHighlights",
+        DocumentHighlightsFull = "documentHighlights-full",
+        Open = "open",
+        Quickinfo = "quickinfo",
+        QuickinfoFull = "quickinfo-full",
+        References = "references",
+        ReferencesFull = "references-full",
+        Reload = "reload",
+        Rename = "rename",
+        RenameInfoFull = "rename-full",
+        RenameLocationsFull = "renameLocations-full",
+        Saveto = "saveto",
+        SignatureHelp = "signatureHelp",
+        SignatureHelpFull = "signatureHelp-full",
+        Status = "status",
+        TypeDefinition = "typeDefinition",
+        ProjectInfo = "projectInfo",
+        ReloadProjects = "reloadProjects",
+        Unknown = "unknown",
+        OpenExternalProject = "openExternalProject",
+        OpenExternalProjects = "openExternalProjects",
+        CloseExternalProject = "closeExternalProject",
+        SynchronizeProjectList = "synchronizeProjectList",
+        ApplyChangedToOpenFiles = "applyChangedToOpenFiles",
+        EncodedSemanticClassificationsFull = "encodedSemanticClassifications-full",
+        Cleanup = "cleanup",
+        GetOutliningSpans = "getOutliningSpans",
+        GetOutliningSpansFull = "outliningSpans",
+        TodoComments = "todoComments",
+        Indentation = "indentation",
+        DocCommentTemplate = "docCommentTemplate",
+        CompilerOptionsDiagnosticsFull = "compilerOptionsDiagnostics-full",
+        NameOrDottedNameSpan = "nameOrDottedNameSpan",
+        BreakpointStatement = "breakpointStatement",
+        CompilerOptionsForInferredProjects = "compilerOptionsForInferredProjects",
+        GetCodeFixes = "getCodeFixes",
+        GetCodeFixesFull = "getCodeFixes-full",
+        GetCombinedCodeFix = "getCombinedCodeFix",
+        GetCombinedCodeFixFull = "getCombinedCodeFix-full",
+        ApplyCodeActionCommand = "applyCodeActionCommand",
+        GetSupportedCodeFixes = "getSupportedCodeFixes",
+        GetApplicableRefactors = "getApplicableRefactors",
+        GetEditsForRefactor = "getEditsForRefactor",
+        GetEditsForRefactorFull = "getEditsForRefactor-full",
+        OrganizeImports = "organizeImports",
+        OrganizeImportsFull = "organizeImports-full",
+        GetEditsForFileRename = "getEditsForFileRename",
+        GetEditsForFileRenameFull = "getEditsForFileRename-full"
+    }
+    interface Message {
+        seq: number;
+        type: "request" | "response" | "event";
+    }
+    interface Request extends Message {
+        type: "request";
+        command: string;
+        arguments?: any;
+    }
+    interface ReloadProjectsRequest extends Message {
+        command: CommandTypes.ReloadProjects;
+    }
+    interface Event extends Message {
+        type: "event";
+        event: string;
+        body?: any;
+    }
+    interface Response extends Message {
+        type: "response";
+        request_seq: number;
+        success: boolean;
+        command: string;
+        message?: string;
+        body?: any;
+    }
+    interface FileRequestArgs {
+        file: string;
+        projectFileName?: string;
+    }
+    interface StatusRequest extends Request {
+        command: CommandTypes.Status;
+    }
+    interface StatusResponseBody {
+        version: string;
+    }
+    interface StatusResponse extends Response {
+        body: StatusResponseBody;
+    }
+    interface DocCommentTemplateRequest extends FileLocationRequest {
+        command: CommandTypes.DocCommentTemplate;
+    }
+    interface DocCommandTemplateResponse extends Response {
+        body?: TextInsertion;
+    }
+    interface TodoCommentRequest extends FileRequest {
+        command: CommandTypes.TodoComments;
+        arguments: TodoCommentRequestArgs;
+    }
+    interface TodoCommentRequestArgs extends FileRequestArgs {
+        descriptors: TodoCommentDescriptor[];
+    }
+    interface TodoCommentsResponse extends Response {
+        body?: TodoComment[];
+    }
+    interface SpanOfEnclosingCommentRequest extends FileLocationRequest {
+        command: CommandTypes.GetSpanOfEnclosingComment;
+        arguments: SpanOfEnclosingCommentRequestArgs;
+    }
+    interface SpanOfEnclosingCommentRequestArgs extends FileLocationRequestArgs {
+        onlyMultiLine: boolean;
+    }
+    interface OutliningSpansRequest extends FileRequest {
+        command: CommandTypes.GetOutliningSpans;
+    }
+    interface OutliningSpan {
+        textSpan: TextSpan;
+        hintSpan: TextSpan;
+        bannerText: string;
+        autoCollapse: boolean;
+        kind: OutliningSpanKind;
+    }
+    interface OutliningSpansResponse extends Response {
+        body?: OutliningSpan[];
+    }
+    interface OutliningSpansRequestFull extends FileRequest {
+        command: CommandTypes.GetOutliningSpansFull;
+    }
+    interface OutliningSpansResponseFull extends Response {
+        body?: ts.OutliningSpan[];
+    }
+    interface IndentationRequest extends FileLocationRequest {
+        command: CommandTypes.Indentation;
+        arguments: IndentationRequestArgs;
+    }
+    interface IndentationResponse extends Response {
+        body?: IndentationResult;
+    }
+    interface IndentationResult {
+        position: number;
+        indentation: number;
+    }
+    interface IndentationRequestArgs extends FileLocationRequestArgs {
+        options?: EditorSettings;
+    }
+    interface ProjectInfoRequestArgs extends FileRequestArgs {
+        needFileNameList: boolean;
+    }
+    interface ProjectInfoRequest extends Request {
+        command: CommandTypes.ProjectInfo;
+        arguments: ProjectInfoRequestArgs;
+    }
+    interface CompilerOptionsDiagnosticsRequest extends Request {
+        arguments: CompilerOptionsDiagnosticsRequestArgs;
+    }
+    interface CompilerOptionsDiagnosticsRequestArgs {
+        projectFileName: string;
+    }
+    interface ProjectInfo {
+        configFileName: string;
+        fileNames?: string[];
+        languageServiceDisabled?: boolean;
+    }
+    interface DiagnosticWithLinePosition {
+        message: string;
+        start: number;
+        length: number;
+        startLocation: Location;
+        endLocation: Location;
+        category: string;
+        code: number;
+        reportsUnnecessary?: {};
+    }
+    interface ProjectInfoResponse extends Response {
+        body?: ProjectInfo;
+    }
+    interface FileRequest extends Request {
+        arguments: FileRequestArgs;
+    }
+    interface FileLocationRequestArgs extends FileRequestArgs {
+        line: number;
+        offset: number;
+        position?: number;
+    }
+    type FileLocationOrRangeRequestArgs = FileLocationRequestArgs | FileRangeRequestArgs;
+    interface GetApplicableRefactorsRequest extends Request {
+        command: CommandTypes.GetApplicableRefactors;
+        arguments: GetApplicableRefactorsRequestArgs;
+    }
+    type GetApplicableRefactorsRequestArgs = FileLocationOrRangeRequestArgs;
+    interface GetApplicableRefactorsResponse extends Response {
+        body?: ApplicableRefactorInfo[];
+    }
+    interface ApplicableRefactorInfo {
+        name: string;
+        description: string;
+        inlineable?: boolean;
+        actions: RefactorActionInfo[];
+    }
+    interface RefactorActionInfo {
+        name: string;
+        description: string;
+    }
+    interface GetEditsForRefactorRequest extends Request {
+        command: CommandTypes.GetEditsForRefactor;
+        arguments: GetEditsForRefactorRequestArgs;
+    }
+    type GetEditsForRefactorRequestArgs = FileLocationOrRangeRequestArgs & {
+        refactor: string;
+        action: string;
+    };
+    interface GetEditsForRefactorResponse extends Response {
+        body?: RefactorEditInfo;
+    }
+    interface RefactorEditInfo {
+        edits: FileCodeEdits[];
+        renameLocation?: Location;
+        renameFilename?: string;
+    }
+    interface OrganizeImportsRequest extends Request {
+        command: CommandTypes.OrganizeImports;
+        arguments: OrganizeImportsRequestArgs;
+    }
+    type OrganizeImportsScope = GetCombinedCodeFixScope;
+    interface OrganizeImportsRequestArgs {
+        scope: OrganizeImportsScope;
+    }
+    interface OrganizeImportsResponse extends Response {
+        edits: ReadonlyArray<FileCodeEdits>;
+    }
+    interface GetEditsForFileRenameRequest extends Request {
+        command: CommandTypes.GetEditsForFileRename;
+        arguments: GetEditsForFileRenameRequestArgs;
+    }
+    interface GetEditsForFileRenameRequestArgs extends FileRequestArgs {
+        readonly oldFilePath: string;
+        readonly newFilePath: string;
+    }
+    interface GetEditsForFileRenameResponse extends Response {
+        edits: ReadonlyArray<FileCodeEdits>;
+    }
+    interface CodeFixRequest extends Request {
+        command: CommandTypes.GetCodeFixes;
+        arguments: CodeFixRequestArgs;
+    }
+    interface GetCombinedCodeFixRequest extends Request {
+        command: CommandTypes.GetCombinedCodeFix;
+        arguments: GetCombinedCodeFixRequestArgs;
+    }
+    interface GetCombinedCodeFixResponse extends Response {
+        body: CombinedCodeActions;
+    }
+    interface ApplyCodeActionCommandRequest extends Request {
+        command: CommandTypes.ApplyCodeActionCommand;
+        arguments: ApplyCodeActionCommandRequestArgs;
+    }
+    interface ApplyCodeActionCommandResponse extends Response {
+    }
+    interface FileRangeRequestArgs extends FileRequestArgs {
+        startLine: number;
+        startOffset: number;
+        startPosition?: number;
+        endLine: number;
+        endOffset: number;
+        endPosition?: number;
+    }
+    interface CodeFixRequestArgs extends FileRangeRequestArgs {
+        errorCodes?: ReadonlyArray<number>;
+    }
+    interface GetCombinedCodeFixRequestArgs {
+        scope: GetCombinedCodeFixScope;
+        fixId: {};
+    }
+    interface GetCombinedCodeFixScope {
+        type: "file";
+        args: FileRequestArgs;
+    }
+    interface ApplyCodeActionCommandRequestArgs {
+        command: {};
+    }
+    interface GetCodeFixesResponse extends Response {
+        body?: CodeAction[];
+    }
+    interface FileLocationRequest extends FileRequest {
+        arguments: FileLocationRequestArgs;
+    }
+    interface GetSupportedCodeFixesRequest extends Request {
+        command: CommandTypes.GetSupportedCodeFixes;
+    }
+    interface GetSupportedCodeFixesResponse extends Response {
+        body?: string[];
+    }
+    interface EncodedSemanticClassificationsRequest extends FileRequest {
+        arguments: EncodedSemanticClassificationsRequestArgs;
+    }
+    interface EncodedSemanticClassificationsRequestArgs extends FileRequestArgs {
+        start: number;
+        length: number;
+    }
+    interface DocumentHighlightsRequestArgs extends FileLocationRequestArgs {
+        filesToSearch: string[];
+    }
+    interface DefinitionRequest extends FileLocationRequest {
+        command: CommandTypes.Definition;
+    }
+    interface TypeDefinitionRequest extends FileLocationRequest {
+        command: CommandTypes.TypeDefinition;
+    }
+    interface ImplementationRequest extends FileLocationRequest {
+        command: CommandTypes.Implementation;
+    }
+    interface Location {
+        line: number;
+        offset: number;
+    }
+    interface TextSpan {
+        start: Location;
+        end: Location;
+    }
+    interface FileSpan extends TextSpan {
+        file: string;
+    }
+    interface DefinitionInfoAndBoundSpan {
+        definitions: ReadonlyArray<FileSpan>;
+        textSpan: TextSpan;
+    }
+    interface DefinitionResponse extends Response {
+        body?: FileSpan[];
+    }
+    interface DefinitionInfoAndBoundSpanReponse extends Response {
+        body?: DefinitionInfoAndBoundSpan;
+    }
+    interface TypeDefinitionResponse extends Response {
+        body?: FileSpan[];
+    }
+    interface ImplementationResponse extends Response {
+        body?: FileSpan[];
+    }
+    interface BraceCompletionRequest extends FileLocationRequest {
+        command: CommandTypes.BraceCompletion;
+        arguments: BraceCompletionRequestArgs;
+    }
+    interface BraceCompletionRequestArgs extends FileLocationRequestArgs {
+        openingBrace: string;
+    }
+    interface JsxClosingTagRequest extends FileLocationRequest {
+        readonly command: CommandTypes.JsxClosingTag;
+        readonly arguments: JsxClosingTagRequestArgs;
+    }
+    interface JsxClosingTagRequestArgs extends FileLocationRequestArgs {
+    }
+    interface JsxClosingTagResponse extends Response {
+        readonly body: TextInsertion;
+    }
+    interface OccurrencesRequest extends FileLocationRequest {
+        command: CommandTypes.Occurrences;
+    }
+    interface OccurrencesResponseItem extends FileSpan {
+        isWriteAccess: boolean;
+        isInString?: true;
+    }
+    interface OccurrencesResponse extends Response {
+        body?: OccurrencesResponseItem[];
+    }
+    interface DocumentHighlightsRequest extends FileLocationRequest {
+        command: CommandTypes.DocumentHighlights;
+        arguments: DocumentHighlightsRequestArgs;
+    }
+    interface HighlightSpan extends TextSpan {
+        kind: HighlightSpanKind;
+    }
+    interface DocumentHighlightsItem {
+        file: string;
+        highlightSpans: HighlightSpan[];
+    }
+    interface DocumentHighlightsResponse extends Response {
+        body?: DocumentHighlightsItem[];
+    }
+    interface ReferencesRequest extends FileLocationRequest {
+        command: CommandTypes.References;
+    }
+    interface ReferencesResponseItem extends FileSpan {
+        lineText: string;
+        isWriteAccess: boolean;
+        isDefinition: boolean;
+    }
+    interface ReferencesResponseBody {
+        refs: ReferencesResponseItem[];
+        symbolName: string;
+        symbolStartOffset: number;
+        symbolDisplayString: string;
+    }
+    interface ReferencesResponse extends Response {
+        body?: ReferencesResponseBody;
+    }
+    interface RenameRequestArgs extends FileLocationRequestArgs {
+        findInComments?: boolean;
+        findInStrings?: boolean;
+    }
+    interface RenameRequest extends FileLocationRequest {
+        command: CommandTypes.Rename;
+        arguments: RenameRequestArgs;
+    }
+    interface RenameInfo {
+        canRename: boolean;
+        localizedErrorMessage?: string;
+        displayName: string;
+        fullDisplayName: string;
+        kind: ScriptElementKind;
+        kindModifiers: string;
+    }
+    interface SpanGroup {
+        file: string;
+        locs: TextSpan[];
+    }
+    interface RenameResponseBody {
+        info: RenameInfo;
+        locs: ReadonlyArray<SpanGroup>;
+    }
+    interface RenameResponse extends Response {
+        body?: RenameResponseBody;
+    }
+    interface ExternalFile {
+        fileName: string;
+        scriptKind?: ScriptKindName | ts.ScriptKind;
+        hasMixedContent?: boolean;
+        content?: string;
+    }
+    interface ExternalProject {
+        projectFileName: string;
+        rootFiles: ExternalFile[];
+        options: ExternalProjectCompilerOptions;
+        typingOptions?: TypeAcquisition;
+        typeAcquisition?: TypeAcquisition;
+    }
+    interface CompileOnSaveMixin {
+        compileOnSave?: boolean;
+    }
+    type ExternalProjectCompilerOptions = CompilerOptions & CompileOnSaveMixin;
+    interface ProjectVersionInfo {
+        projectName: string;
+        isInferred: boolean;
+        version: number;
+        options: ts.CompilerOptions;
+        languageServiceDisabled: boolean;
+        lastFileExceededProgramSize?: string;
+    }
+    interface ProjectChanges {
+        added: string[];
+        removed: string[];
+        updated: string[];
+    }
+    interface ProjectFiles {
+        info?: ProjectVersionInfo;
+        files?: string[];
+        changes?: ProjectChanges;
+    }
+    interface ProjectFilesWithDiagnostics extends ProjectFiles {
+        projectErrors: DiagnosticWithLinePosition[];
+    }
+    interface ChangedOpenFile {
+        fileName: string;
+        changes: ts.TextChange[];
+    }
+    interface ConfigureRequestArguments {
+        hostInfo?: string;
+        file?: string;
+        formatOptions?: FormatCodeSettings;
+        preferences?: UserPreferences;
+        extraFileExtensions?: FileExtensionInfo[];
+    }
+    interface ConfigureRequest extends Request {
+        command: CommandTypes.Configure;
+        arguments: ConfigureRequestArguments;
+    }
+    interface ConfigureResponse extends Response {
+    }
+    interface OpenRequestArgs extends FileRequestArgs {
+        fileContent?: string;
+        scriptKindName?: ScriptKindName;
+        projectRootPath?: string;
+    }
+    type ScriptKindName = "TS" | "JS" | "TSX" | "JSX";
+    interface OpenRequest extends Request {
+        command: CommandTypes.Open;
+        arguments: OpenRequestArgs;
+    }
+    interface OpenExternalProjectRequest extends Request {
+        command: CommandTypes.OpenExternalProject;
+        arguments: OpenExternalProjectArgs;
+    }
+    type OpenExternalProjectArgs = ExternalProject;
+    interface OpenExternalProjectsRequest extends Request {
+        command: CommandTypes.OpenExternalProjects;
+        arguments: OpenExternalProjectsArgs;
+    }
+    interface OpenExternalProjectsArgs {
+        projects: ExternalProject[];
+    }
+    interface OpenExternalProjectResponse extends Response {
+    }
+    interface OpenExternalProjectsResponse extends Response {
+    }
+    interface CloseExternalProjectRequest extends Request {
+        command: CommandTypes.CloseExternalProject;
+        arguments: CloseExternalProjectRequestArgs;
+    }
+    interface CloseExternalProjectRequestArgs {
+        projectFileName: string;
+    }
+    interface CloseExternalProjectResponse extends Response {
+    }
+    interface SynchronizeProjectListRequest extends Request {
+        arguments: SynchronizeProjectListRequestArgs;
+    }
+    interface SynchronizeProjectListRequestArgs {
+        knownProjects: protocol.ProjectVersionInfo[];
+    }
+    interface ApplyChangedToOpenFilesRequest extends Request {
+        arguments: ApplyChangedToOpenFilesRequestArgs;
+    }
+    interface ApplyChangedToOpenFilesRequestArgs {
+        openFiles?: ExternalFile[];
+        changedFiles?: ChangedOpenFile[];
+        closedFiles?: string[];
+    }
+    interface SetCompilerOptionsForInferredProjectsRequest extends Request {
+        command: CommandTypes.CompilerOptionsForInferredProjects;
+        arguments: SetCompilerOptionsForInferredProjectsArgs;
+    }
+    interface SetCompilerOptionsForInferredProjectsArgs {
+        options: ExternalProjectCompilerOptions;
+        projectRootPath?: string;
+    }
+    interface SetCompilerOptionsForInferredProjectsResponse extends Response {
+    }
+    interface ExitRequest extends Request {
+        command: CommandTypes.Exit;
+    }
+    interface CloseRequest extends FileRequest {
+        command: CommandTypes.Close;
+    }
+    interface CompileOnSaveAffectedFileListRequest extends FileRequest {
+        command: CommandTypes.CompileOnSaveAffectedFileList;
+    }
+    interface CompileOnSaveAffectedFileListSingleProject {
+        projectFileName: string;
+        fileNames: string[];
+        projectUsesOutFile: boolean;
+    }
+    interface CompileOnSaveAffectedFileListResponse extends Response {
+        body: CompileOnSaveAffectedFileListSingleProject[];
+    }
+    interface CompileOnSaveEmitFileRequest extends FileRequest {
+        command: CommandTypes.CompileOnSaveEmitFile;
+        arguments: CompileOnSaveEmitFileRequestArgs;
+    }
+    interface CompileOnSaveEmitFileRequestArgs extends FileRequestArgs {
+        forced?: boolean;
+    }
+    interface QuickInfoRequest extends FileLocationRequest {
+        command: CommandTypes.Quickinfo;
+    }
+    interface QuickInfoResponseBody {
+        kind: ScriptElementKind;
+        kindModifiers: string;
+        start: Location;
+        end: Location;
+        displayString: string;
+        documentation: string;
+        tags: JSDocTagInfo[];
+    }
+    interface QuickInfoResponse extends Response {
+        body?: QuickInfoResponseBody;
+    }
+    interface FormatRequestArgs extends FileLocationRequestArgs {
+        endLine: number;
+        endOffset: number;
+        endPosition?: number;
+        options?: FormatCodeSettings;
+    }
+    interface FormatRequest extends FileLocationRequest {
+        command: CommandTypes.Format;
+        arguments: FormatRequestArgs;
+    }
+    interface CodeEdit {
+        start: Location;
+        end: Location;
+        newText: string;
+    }
+    interface FileCodeEdits {
+        fileName: string;
+        textChanges: CodeEdit[];
+    }
+    interface CodeFixResponse extends Response {
+        body?: CodeFixAction[];
+    }
+    interface CodeAction {
+        description: string;
+        changes: FileCodeEdits[];
+        commands?: {}[];
+    }
+    interface CombinedCodeActions {
+        changes: ReadonlyArray<FileCodeEdits>;
+        commands?: ReadonlyArray<{}>;
+    }
+    interface CodeFixAction extends CodeAction {
+        fixName: string;
+        fixId?: {};
+        fixAllDescription?: string;
+    }
+    interface FormatResponse extends Response {
+        body?: CodeEdit[];
+    }
+    interface FormatOnKeyRequestArgs extends FileLocationRequestArgs {
+        key: string;
+        options?: FormatCodeSettings;
+    }
+    interface FormatOnKeyRequest extends FileLocationRequest {
+        command: CommandTypes.Formatonkey;
+        arguments: FormatOnKeyRequestArgs;
+    }
+    type CompletionsTriggerCharacter = "." | '"' | "'" | "`" | "/" | "@" | "<";
+    interface CompletionsRequestArgs extends FileLocationRequestArgs {
+        prefix?: string;
+        triggerCharacter?: CompletionsTriggerCharacter;
+        includeExternalModuleExports?: boolean;
+        includeInsertTextCompletions?: boolean;
+    }
+    interface CompletionsRequest extends FileLocationRequest {
+        command: CommandTypes.Completions;
+        arguments: CompletionsRequestArgs;
+    }
+    interface CompletionDetailsRequestArgs extends FileLocationRequestArgs {
+        entryNames: (string | CompletionEntryIdentifier)[];
+    }
+    interface CompletionEntryIdentifier {
+        name: string;
+        source?: string;
+    }
+    interface CompletionDetailsRequest extends FileLocationRequest {
+        command: CommandTypes.CompletionDetails;
+        arguments: CompletionDetailsRequestArgs;
+    }
+    interface SymbolDisplayPart {
+        text: string;
+        kind: string;
+    }
+    interface CompletionEntry {
+        name: string;
+        kind: ScriptElementKind;
+        kindModifiers?: string;
+        sortText: string;
+        insertText?: string;
+        replacementSpan?: TextSpan;
+        hasAction?: true;
+        source?: string;
+        isRecommended?: true;
+    }
+    interface CompletionEntryDetails {
+        name: string;
+        kind: ScriptElementKind;
+        kindModifiers: string;
+        displayParts: SymbolDisplayPart[];
+        documentation?: SymbolDisplayPart[];
+        tags?: JSDocTagInfo[];
+        codeActions?: CodeAction[];
+        source?: SymbolDisplayPart[];
+    }
+    interface CompletionsResponse extends Response {
+        body?: CompletionEntry[];
+    }
+    interface CompletionDetailsResponse extends Response {
+        body?: CompletionEntryDetails[];
+    }
+    interface SignatureHelpParameter {
+        name: string;
+        documentation: SymbolDisplayPart[];
+        displayParts: SymbolDisplayPart[];
+        isOptional: boolean;
+    }
+    interface SignatureHelpItem {
+        isVariadic: boolean;
+        prefixDisplayParts: SymbolDisplayPart[];
+        suffixDisplayParts: SymbolDisplayPart[];
+        separatorDisplayParts: SymbolDisplayPart[];
+        parameters: SignatureHelpParameter[];
+        documentation: SymbolDisplayPart[];
+        tags: JSDocTagInfo[];
+    }
+    interface SignatureHelpItems {
+        items: SignatureHelpItem[];
+        applicableSpan: TextSpan;
+        selectedItemIndex: number;
+        argumentIndex: number;
+        argumentCount: number;
+    }
+    interface SignatureHelpRequestArgs extends FileLocationRequestArgs {
+    }
+    interface SignatureHelpRequest extends FileLocationRequest {
+        command: CommandTypes.SignatureHelp;
+        arguments: SignatureHelpRequestArgs;
+    }
+    interface SignatureHelpResponse extends Response {
+        body?: SignatureHelpItems;
+    }
+    interface SemanticDiagnosticsSyncRequest extends FileRequest {
+        command: CommandTypes.SemanticDiagnosticsSync;
+        arguments: SemanticDiagnosticsSyncRequestArgs;
+    }
+    interface SemanticDiagnosticsSyncRequestArgs extends FileRequestArgs {
+        includeLinePosition?: boolean;
+    }
+    interface SemanticDiagnosticsSyncResponse extends Response {
+        body?: Diagnostic[] | DiagnosticWithLinePosition[];
+    }
+    interface SuggestionDiagnosticsSyncRequest extends FileRequest {
+        command: CommandTypes.SuggestionDiagnosticsSync;
+        arguments: SuggestionDiagnosticsSyncRequestArgs;
+    }
+    type SuggestionDiagnosticsSyncRequestArgs = SemanticDiagnosticsSyncRequestArgs;
+    type SuggestionDiagnosticsSyncResponse = SemanticDiagnosticsSyncResponse;
+    interface SyntacticDiagnosticsSyncRequest extends FileRequest {
+        command: CommandTypes.SyntacticDiagnosticsSync;
+        arguments: SyntacticDiagnosticsSyncRequestArgs;
+    }
+    interface SyntacticDiagnosticsSyncRequestArgs extends FileRequestArgs {
+        includeLinePosition?: boolean;
+    }
+    interface SyntacticDiagnosticsSyncResponse extends Response {
+        body?: Diagnostic[] | DiagnosticWithLinePosition[];
+    }
+    interface GeterrForProjectRequestArgs {
+        file: string;
+        delay: number;
+    }
+    interface GeterrForProjectRequest extends Request {
+        command: CommandTypes.GeterrForProject;
+        arguments: GeterrForProjectRequestArgs;
+    }
+    interface GeterrRequestArgs {
+        files: string[];
+        delay: number;
+    }
+    interface GeterrRequest extends Request {
+        command: CommandTypes.Geterr;
+        arguments: GeterrRequestArgs;
+    }
+    type RequestCompletedEventName = "requestCompleted";
+    interface RequestCompletedEvent extends Event {
+        event: RequestCompletedEventName;
+        body: RequestCompletedEventBody;
+    }
+    interface RequestCompletedEventBody {
+        request_seq: number;
+    }
+    interface Diagnostic {
+        start: Location;
+        end: Location;
+        text: string;
+        category: string;
+        reportsUnnecessary?: {};
+        code?: number;
+        source?: string;
+    }
+    interface DiagnosticWithFileName extends Diagnostic {
+        fileName: string;
+    }
+    interface DiagnosticEventBody {
+        file: string;
+        diagnostics: Diagnostic[];
+    }
+    type DiagnosticEventKind = "semanticDiag" | "syntaxDiag" | "suggestionDiag";
+    interface DiagnosticEvent extends Event {
+        body?: DiagnosticEventBody;
+    }
+    interface ConfigFileDiagnosticEventBody {
+        triggerFile: string;
+        configFile: string;
+        diagnostics: DiagnosticWithFileName[];
+    }
+    interface ConfigFileDiagnosticEvent extends Event {
+        body?: ConfigFileDiagnosticEventBody;
+        event: "configFileDiag";
+    }
+    type ProjectLanguageServiceStateEventName = "projectLanguageServiceState";
+    interface ProjectLanguageServiceStateEvent extends Event {
+        event: ProjectLanguageServiceStateEventName;
+        body?: ProjectLanguageServiceStateEventBody;
+    }
+    interface ProjectLanguageServiceStateEventBody {
+        projectName: string;
+        languageServiceEnabled: boolean;
+    }
+    type ProjectsUpdatedInBackgroundEventName = "projectsUpdatedInBackground";
+    interface ProjectsUpdatedInBackgroundEvent extends Event {
+        event: ProjectsUpdatedInBackgroundEventName;
+        body: ProjectsUpdatedInBackgroundEventBody;
+    }
+    interface ProjectsUpdatedInBackgroundEventBody {
+        openFiles: string[];
+    }
+    interface ReloadRequestArgs extends FileRequestArgs {
+        tmpfile: string;
+    }
+    interface ReloadRequest extends FileRequest {
+        command: CommandTypes.Reload;
+        arguments: ReloadRequestArgs;
+    }
+    interface ReloadResponse extends Response {
+    }
+    interface SavetoRequestArgs extends FileRequestArgs {
+        tmpfile: string;
+    }
+    interface SavetoRequest extends FileRequest {
+        command: CommandTypes.Saveto;
+        arguments: SavetoRequestArgs;
+    }
+    interface NavtoRequestArgs extends FileRequestArgs {
+        searchValue: string;
+        maxResultCount?: number;
+        currentFileOnly?: boolean;
+        projectFileName?: string;
+    }
+    interface NavtoRequest extends FileRequest {
+        command: CommandTypes.Navto;
+        arguments: NavtoRequestArgs;
+    }
+    interface NavtoItem {
+        name: string;
+        kind: ScriptElementKind;
+        matchKind?: string;
+        isCaseSensitive?: boolean;
+        kindModifiers?: string;
+        file: string;
+        start: Location;
+        end: Location;
+        containerName?: string;
+        containerKind?: ScriptElementKind;
+    }
+    interface NavtoResponse extends Response {
+        body?: NavtoItem[];
+    }
+    interface ChangeRequestArgs extends FormatRequestArgs {
+        insertString?: string;
+    }
+    interface ChangeRequest extends FileLocationRequest {
+        command: CommandTypes.Change;
+        arguments: ChangeRequestArgs;
+    }
+    interface BraceResponse extends Response {
+        body?: TextSpan[];
+    }
+    interface BraceRequest extends FileLocationRequest {
+        command: CommandTypes.Brace;
+    }
+    interface NavBarRequest extends FileRequest {
+        command: CommandTypes.NavBar;
+    }
+    interface NavTreeRequest extends FileRequest {
+        command: CommandTypes.NavTree;
+    }
+    interface NavigationBarItem {
+        text: string;
+        kind: ScriptElementKind;
+        kindModifiers?: string;
+        spans: TextSpan[];
+        childItems?: NavigationBarItem[];
+        indent: number;
+    }
+    interface NavigationTree {
+        text: string;
+        kind: ScriptElementKind;
+        kindModifiers: string;
+        spans: TextSpan[];
+        nameSpan: TextSpan | undefined;
+        childItems?: NavigationTree[];
+    }
+    type TelemetryEventName = "telemetry";
+    interface TelemetryEvent extends Event {
+        event: TelemetryEventName;
+        body: TelemetryEventBody;
+    }
+    interface TelemetryEventBody {
+        telemetryEventName: string;
+        payload: any;
+    }
+    type TypesInstallerInitializationFailedEventName = "typesInstallerInitializationFailed";
+    interface TypesInstallerInitializationFailedEvent extends Event {
+        event: TypesInstallerInitializationFailedEventName;
+        body: TypesInstallerInitializationFailedEventBody;
+    }
+    interface TypesInstallerInitializationFailedEventBody {
+        message: string;
+    }
+    type TypingsInstalledTelemetryEventName = "typingsInstalled";
+    interface TypingsInstalledTelemetryEventBody extends TelemetryEventBody {
+        telemetryEventName: TypingsInstalledTelemetryEventName;
+        payload: TypingsInstalledTelemetryEventPayload;
+    }
+    interface TypingsInstalledTelemetryEventPayload {
+        installedPackages: string;
+        installSuccess: boolean;
+        typingsInstallerVersion: string;
+    }
+    type BeginInstallTypesEventName = "beginInstallTypes";
+    type EndInstallTypesEventName = "endInstallTypes";
+    interface BeginInstallTypesEvent extends Event {
+        event: BeginInstallTypesEventName;
+        body: BeginInstallTypesEventBody;
+    }
+    interface EndInstallTypesEvent extends Event {
+        event: EndInstallTypesEventName;
+        body: EndInstallTypesEventBody;
+    }
+    interface InstallTypesEventBody {
+        eventId: number;
+        packages: ReadonlyArray<string>;
+    }
+    interface BeginInstallTypesEventBody extends InstallTypesEventBody {
+    }
+    interface EndInstallTypesEventBody extends InstallTypesEventBody {
+        success: boolean;
+    }
+    interface NavBarResponse extends Response {
+        body?: NavigationBarItem[];
+    }
+    interface NavTreeResponse extends Response {
+        body?: NavigationTree;
+    }
+    enum IndentStyle {
+        None = "None",
+        Block = "Block",
+        Smart = "Smart"
+    }
+    interface EditorSettings {
+        baseIndentSize?: number;
+        indentSize?: number;
+        tabSize?: number;
+        newLineCharacter?: string;
+        convertTabsToSpaces?: boolean;
+        indentStyle?: IndentStyle | ts.IndentStyle;
+    }
+    interface FormatCodeSettings extends EditorSettings {
+        insertSpaceAfterCommaDelimiter?: boolean;
+        insertSpaceAfterSemicolonInForStatements?: boolean;
+        insertSpaceBeforeAndAfterBinaryOperators?: boolean;
+        insertSpaceAfterConstructor?: boolean;
+        insertSpaceAfterKeywordsInControlFlowStatements?: boolean;
+        insertSpaceAfterFunctionKeywordForAnonymousFunctions?: boolean;
+        insertSpaceAfterOpeningAndBeforeClosingNonemptyParenthesis?: boolean;
+        insertSpaceAfterOpeningAndBeforeClosingNonemptyBrackets?: boolean;
+        insertSpaceAfterOpeningAndBeforeClosingNonemptyBraces?: boolean;
+        insertSpaceAfterOpeningAndBeforeClosingTemplateStringBraces?: boolean;
+        insertSpaceAfterOpeningAndBeforeClosingJsxExpressionBraces?: boolean;
+        insertSpaceAfterTypeAssertion?: boolean;
+        insertSpaceBeforeFunctionParenthesis?: boolean;
+        placeOpenBraceOnNewLineForFunctions?: boolean;
+        placeOpenBraceOnNewLineForControlBlocks?: boolean;
+        insertSpaceBeforeTypeAnnotation?: boolean;
+    }
+    interface UserPreferences {
+        readonly disableSuggestions?: boolean;
+        readonly quotePreference?: "double" | "single";
+        readonly includeCompletionsForModuleExports?: boolean;
+        readonly includeCompletionsWithInsertText?: boolean;
+        readonly importModuleSpecifierPreference?: "relative" | "non-relative";
+        readonly allowTextChangesInNewFiles?: boolean;
+    }
+    interface CompilerOptions {
+        allowJs?: boolean;
+        allowSyntheticDefaultImports?: boolean;
+        allowUnreachableCode?: boolean;
+        allowUnusedLabels?: boolean;
+        alwaysStrict?: boolean;
+        baseUrl?: string;
+        charset?: string;
+        checkJs?: boolean;
+        declaration?: boolean;
+        declarationDir?: string;
+        disableSizeLimit?: boolean;
+        downlevelIteration?: boolean;
+        emitBOM?: boolean;
+        emitDecoratorMetadata?: boolean;
+        experimentalDecorators?: boolean;
+        forceConsistentCasingInFileNames?: boolean;
+        importHelpers?: boolean;
+        inlineSourceMap?: boolean;
+        inlineSources?: boolean;
+        isolatedModules?: boolean;
+        jsx?: JsxEmit | ts.JsxEmit;
+        lib?: string[];
+        locale?: string;
+        mapRoot?: string;
+        maxNodeModuleJsDepth?: number;
+        module?: ModuleKind | ts.ModuleKind;
+        moduleResolution?: ModuleResolutionKind | ts.ModuleResolutionKind;
+        newLine?: NewLineKind | ts.NewLineKind;
+        noEmit?: boolean;
+        noEmitHelpers?: boolean;
+        noEmitOnError?: boolean;
+        noErrorTruncation?: boolean;
+        noFallthroughCasesInSwitch?: boolean;
+        noImplicitAny?: boolean;
+        noImplicitReturns?: boolean;
+        noImplicitThis?: boolean;
+        noUnusedLocals?: boolean;
+        noUnusedParameters?: boolean;
+        noImplicitUseStrict?: boolean;
+        noLib?: boolean;
+        noResolve?: boolean;
+        out?: string;
+        outDir?: string;
+        outFile?: string;
+        paths?: MapLike<string[]>;
+        plugins?: PluginImport[];
+        preserveConstEnums?: boolean;
+        preserveSymlinks?: boolean;
+        project?: string;
+        reactNamespace?: string;
+        removeComments?: boolean;
+        references?: ProjectReference[];
+        rootDir?: string;
+        rootDirs?: string[];
+        skipLibCheck?: boolean;
+        skipDefaultLibCheck?: boolean;
+        sourceMap?: boolean;
+        sourceRoot?: string;
+        strict?: boolean;
+        strictNullChecks?: boolean;
+        suppressExcessPropertyErrors?: boolean;
+        suppressImplicitAnyIndexErrors?: boolean;
+        target?: ScriptTarget | ts.ScriptTarget;
+        traceResolution?: boolean;
+        resolveJsonModule?: boolean;
+        types?: string[];
+        typeRoots?: string[];
+        [option: string]: CompilerOptionsValue | undefined;
+    }
+    enum JsxEmit {
+        None = "None",
+        Preserve = "Preserve",
+        ReactNative = "ReactNative",
+        React = "React"
+    }
+    enum ModuleKind {
+        None = "None",
+        CommonJS = "CommonJS",
+        AMD = "AMD",
+        UMD = "UMD",
+        System = "System",
+        ES6 = "ES6",
+        ES2015 = "ES2015",
+        ESNext = "ESNext"
+    }
+    enum ModuleResolutionKind {
+        Classic = "Classic",
+        Node = "Node"
+    }
+    enum NewLineKind {
+        Crlf = "Crlf",
+        Lf = "Lf"
+    }
+    enum ScriptTarget {
+        ES3 = "ES3",
+        ES5 = "ES5",
+        ES6 = "ES6",
+        ES2015 = "ES2015",
+        ES2016 = "ES2016",
+        ES2017 = "ES2017",
+        ESNext = "ESNext"
+    }
+}
+declare namespace ts.server {
+    class TextStorage {
+        private readonly host;
+        private readonly fileName;
+        private svc;
+        private svcVersion;
+        private text;
+        private lineMap;
+        private textVersion;
+        isOpen: boolean;
+        private ownFileText;
+        private pendingReloadFromDisk;
+        constructor(host: ServerHost, fileName: NormalizedPath);
+        getVersion(): string;
+        hasScriptVersionCache_TestOnly(): boolean;
+        useScriptVersionCache_TestOnly(): void;
+        useText(newText?: string): void;
+        edit(start: number, end: number, newText: string): void;
+        reload(newText: string): true | undefined;
+        reloadWithFileText(tempFileName?: string): true | undefined;
+        reloadFromDisk(): boolean | undefined;
+        delayReloadFromFileIntoText(): void;
+        getSnapshot(): IScriptSnapshot;
+        getLineInfo(line: number): AbsolutePositionAndLineText;
+        lineToTextSpan(line: number): TextSpan;
+        lineOffsetToPosition(line: number, offset: number): number;
+        positionToLineOffset(position: number): protocol.Location;
+        private getFileText;
+        private switchToScriptVersionCache;
+        private useScriptVersionCacheIfValidOrOpen;
+        private getOrLoadText;
+        private getLineMap;
+    }
+    function isDynamicFileName(fileName: NormalizedPath): boolean;
+    interface DocumentRegistrySourceFileCache {
+        key: DocumentRegistryBucketKey;
+        sourceFile: SourceFile;
+    }
+    class ScriptInfo {
+        private readonly host;
+        readonly fileName: NormalizedPath;
+        readonly scriptKind: ScriptKind;
+        readonly hasMixedContent: boolean;
+        readonly path: Path;
+        readonly containingProjects: Project[];
+        private formatSettings;
+        private preferences;
+        fileWatcher: FileWatcher | undefined;
+        private textStorage;
+        readonly isDynamic: boolean;
+        private realpath;
+        cacheSourceFile: DocumentRegistrySourceFileCache;
+        constructor(host: ServerHost, fileName: NormalizedPath, scriptKind: ScriptKind, hasMixedContent: boolean, path: Path);
+        isDynamicOrHasMixedContent(): boolean;
+        isScriptOpen(): boolean;
+        open(newText: string): void;
+        close(fileExists?: boolean): void;
+        getSnapshot(): IScriptSnapshot;
+        private ensureRealPath;
+        getRealpathIfDifferent(): Path | undefined;
+        getFormatCodeSettings(): FormatCodeSettings | undefined;
+        getPreferences(): UserPreferences | undefined;
+        attachToProject(project: Project): boolean;
+        isAttached(project: Project): boolean;
+        detachFromProject(project: Project): void;
+        detachAllProjects(): void;
+        getDefaultProject(): Project;
+        registerFileUpdate(): void;
+        setOptions(formatSettings: FormatCodeSettings, preferences: UserPreferences | undefined): void;
+        getLatestVersion(): string;
+        saveTo(fileName: string): void;
+        delayReloadNonMixedContentFile(): void;
+        reloadFromFile(tempFileName?: NormalizedPath): void;
+        getLineInfo(line: number): AbsolutePositionAndLineText;
+        editContent(start: number, end: number, newText: string): void;
+        markContainingProjectsAsDirty(): void;
+        isOrphan(): boolean;
+        lineToTextSpan(line: number): TextSpan;
+        lineOffsetToPosition(line: number, offset: number): number;
+        positionToLineOffset(position: number): protocol.Location;
+        isJavaScript(): boolean;
+    }
+}
+declare namespace ts.server {
+    interface InstallPackageOptionsWithProject extends InstallPackageOptions {
+        projectName: string;
+        projectRootPath: Path;
+    }
+    interface ITypingsInstaller {
+        isKnownTypesPackageName(name: string): boolean;
+        installPackage(options: InstallPackageOptionsWithProject): Promise<ApplyCodeActionCommandResult>;
+        enqueueInstallTypingsRequest(p: Project, typeAcquisition: TypeAcquisition, unresolvedImports: SortedReadonlyArray<string> | undefined): void;
+        attach(projectService: ProjectService): void;
+        onProjectClosed(p: Project): void;
+        readonly globalTypingsCacheLocation: string | undefined;
+    }
+    const nullTypingsInstaller: ITypingsInstaller;
+    class TypingsCache {
+        private readonly installer;
+        private readonly perProjectCache;
+        constructor(installer: ITypingsInstaller);
+        isKnownTypesPackageName(name: string): boolean;
+        installPackage(options: InstallPackageOptionsWithProject): Promise<ApplyCodeActionCommandResult>;
+        enqueueInstallTypingsForProject(project: Project, unresolvedImports: SortedReadonlyArray<string> | undefined, forceRefresh: boolean): void;
+        updateTypingsForProject(projectName: string, compilerOptions: CompilerOptions, typeAcquisition: TypeAcquisition, unresolvedImports: SortedReadonlyArray<string>, newTypings: string[]): SortedReadonlyArray<never> | SortedArray<string>;
+        onProjectClosed(project: Project): void;
+    }
+}
+declare namespace ts.server {
+    enum ProjectKind {
+        Inferred = 0,
+        Configured = 1,
+        External = 2
+    }
+    type Mutable<T> = {
+        -readonly [K in keyof T]: T[K];
+    };
+    function countEachFileTypes(infos: ScriptInfo[]): FileStats;
+    function allRootFilesAreJsOrDts(project: Project): boolean;
+    function allFilesAreJsOrDts(project: Project): boolean;
+    function hasNoTypeScriptSource(fileNames: string[]): boolean;
+    interface ProjectFilesWithTSDiagnostics extends protocol.ProjectFiles {
+        projectErrors: ReadonlyArray<Diagnostic>;
+    }
+    interface PluginCreateInfo {
+        project: Project;
+        languageService: LanguageService;
+        languageServiceHost: LanguageServiceHost;
+        serverHost: ServerHost;
+        config: any;
+    }
+    interface PluginModule {
+        create(createInfo: PluginCreateInfo): LanguageService;
+        getExternalFiles?(proj: Project): string[];
+    }
+    type PluginModuleFactory = (mod: {
+        typescript: typeof ts;
+    }) => PluginModule;
+    type ProjectRoot = ScriptInfo | NormalizedPath;
+    function isScriptInfo(value: ProjectRoot): value is ScriptInfo;
+    abstract class Project implements LanguageServiceHost, ModuleResolutionHost {
+        readonly projectName: string;
+        readonly projectKind: ProjectKind;
+        readonly projectService: ProjectService;
+        private documentRegistry;
+        private compilerOptions;
+        compileOnSaveEnabled: boolean;
+        private rootFiles;
+        private rootFilesMap;
+        private program;
+        private externalFiles;
+        private missingFilesMap;
+        private plugins;
+        cachedUnresolvedImportsPerFile: Map<ReadonlyArray<string>>;
+        lastCachedUnresolvedImportsList: SortedReadonlyArray<string> | undefined;
+        private hasAddedorRemovedFiles;
+        private lastFileExceededProgramSize;
+        protected languageService: LanguageService;
+        languageServiceEnabled: boolean;
+        readonly trace?: (s: string) => void;
+        readonly realpath?: (path: string) => string;
+        hasInvalidatedResolution: HasInvalidatedResolution;
+        resolutionCache: ResolutionCache;
+        private builderState;
+        private updatedFileNames;
+        private lastReportedFileNames;
+        private lastReportedVersion;
+        private projectProgramVersion;
+        private projectStateVersion;
+        dirty: boolean;
+        hasChangedAutomaticTypeDirectiveNames: boolean;
+        typingFiles: SortedReadonlyArray<string>;
+        private readonly cancellationToken;
+        isNonTsProject(): boolean;
+        isJsOnlyProject(): boolean;
+        static resolveModule(moduleName: string, initialDir: string, host: ServerHost, log: (message: string) => void): {} | undefined;
+        readonly currentDirectory: string;
+        directoryStructureHost: DirectoryStructureHost;
+        readonly getCanonicalFileName: GetCanonicalFileName;
+        constructor(projectName: string, projectKind: ProjectKind, projectService: ProjectService, documentRegistry: DocumentRegistry, hasExplicitListOfFiles: boolean, lastFileExceededProgramSize: string | undefined, compilerOptions: CompilerOptions, compileOnSaveEnabled: boolean, directoryStructureHost: DirectoryStructureHost, currentDirectory: string | undefined);
+        isKnownTypesPackageName(name: string): boolean;
+        installPackage(options: InstallPackageOptions): Promise<ApplyCodeActionCommandResult>;
+        private readonly typingsCache;
+        getCompilationSettings(): CompilerOptions;
+        getCompilerOptions(): CompilerOptions;
+        getNewLine(): string;
+        getProjectVersion(): string;
+        getProjectReferences(): ReadonlyArray<ProjectReference> | undefined;
+        getScriptFileNames(): string[];
+        private getOrCreateScriptInfoAndAttachToProject;
+        getScriptKind(fileName: string): ScriptKind;
+        getScriptVersion(filename: string): string;
+        getScriptSnapshot(filename: string): IScriptSnapshot | undefined;
+        getCancellationToken(): HostCancellationToken;
+        getCurrentDirectory(): string;
+        getDefaultLibFileName(): string;
+        useCaseSensitiveFileNames(): boolean;
+        readDirectory(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
+        readFile(fileName: string): string | undefined;
+        fileExists(file: string): boolean;
+        resolveModuleNames(moduleNames: string[], containingFile: string, reusedNames?: string[]): ResolvedModuleFull[];
+        getResolvedModuleWithFailedLookupLocationsFromCache(moduleName: string, containingFile: string): ResolvedModuleWithFailedLookupLocations | undefined;
+        resolveTypeReferenceDirectives(typeDirectiveNames: string[], containingFile: string): ResolvedTypeReferenceDirective[];
+        directoryExists(path: string): boolean;
+        getDirectories(path: string): string[];
+        getCachedDirectoryStructureHost(): CachedDirectoryStructureHost;
+        toPath(fileName: string): Path;
+        watchDirectoryOfFailedLookupLocation(directory: string, cb: DirectoryWatcherCallback, flags: WatchDirectoryFlags): FileWatcher;
+        onInvalidatedResolution(): void;
+        watchTypeRootsDirectory(directory: string, cb: DirectoryWatcherCallback, flags: WatchDirectoryFlags): FileWatcher;
+        onChangedAutomaticTypeDirectiveNames(): void;
+        getGlobalCache(): string | undefined;
+        writeLog(s: string): void;
+        log(s: string): void;
+        error(s: string): void;
+        private setInternalCompilerOptionsForEmittingJsFiles;
+        getGlobalProjectErrors(): ReadonlyArray<Diagnostic>;
+        getAllProjectErrors(): ReadonlyArray<Diagnostic>;
+        getLanguageService(ensureSynchronized?: boolean): LanguageService;
+        private shouldEmitFile;
+        getCompileOnSaveAffectedFileList(scriptInfo: ScriptInfo): string[];
+        emitFile(scriptInfo: ScriptInfo, writeFile: (path: string, data: string, writeByteOrderMark?: boolean) => void): boolean;
+        enableLanguageService(): void;
+        disableLanguageService(lastFileExceededProgramSize?: string): void;
+        getProjectName(): string;
+        abstract getTypeAcquisition(): TypeAcquisition;
+        protected removeLocalTypingsFromTypeAcquisition(newTypeAcquisition: TypeAcquisition): TypeAcquisition;
+        getExternalFiles(): SortedReadonlyArray<string>;
+        getSourceFile(path: Path): SourceFile | undefined;
+        getSourceFileOrConfigFile(path: Path): SourceFile | undefined;
+        close(): void;
+        private detachScriptInfoIfNotRoot;
+        isClosed(): boolean;
+        hasRoots(): boolean;
+        isOrphan(): boolean;
+        getRootFiles(): NormalizedPath[];
+        getRootFilesMap(): Map<ProjectRoot>;
+        getRootScriptInfos(): ScriptInfo[];
+        getScriptInfos(): ScriptInfo[];
+        getExcludedFiles(): ReadonlyArray<NormalizedPath>;
+        getFileNames(excludeFilesFromExternalLibraries?: boolean, excludeConfigFiles?: boolean): NormalizedPath[];
+        hasConfigFile(configFilePath: NormalizedPath): boolean;
+        containsScriptInfo(info: ScriptInfo): boolean;
+        containsFile(filename: NormalizedPath, requireOpen?: boolean): boolean;
+        isRoot(info: ScriptInfo): boolean;
+        addRoot(info: ScriptInfo): void;
+        addMissingFileRoot(fileName: NormalizedPath): void;
+        removeFile(info: ScriptInfo, fileExists: boolean, detachFromProject: boolean): void;
+        registerFileUpdate(fileName: string): void;
+        markAsDirty(): void;
+        private extractUnresolvedImportsFromSourceFile;
+        onFileAddedOrRemoved(): void;
+        updateGraph(): boolean;
+        updateTypingFiles(typingFiles: SortedReadonlyArray<string>): void;
+        getCurrentProgram(): Program;
+        protected removeExistingTypings(include: string[]): string[];
+        private updateGraphWorker;
+        private detachScriptInfoFromProject;
+        private addMissingFileWatcher;
+        private isWatchedMissingFile;
+        getScriptInfoForNormalizedPath(fileName: NormalizedPath): ScriptInfo | undefined;
+        getScriptInfo(uncheckedFileName: string): ScriptInfo | undefined;
+        filesToString(writeProjectFileNames: boolean): string;
+        setCompilerOptions(compilerOptions: CompilerOptions): void;
+        getChangesSinceVersion(lastKnownVersion?: number): ProjectFilesWithTSDiagnostics;
+        protected removeRoot(info: ScriptInfo): void;
+        protected enableGlobalPlugins(): void;
+        protected enablePlugin(pluginConfigEntry: PluginImport, searchPaths: string[]): void;
+        refreshDiagnostics(): void;
+        private enableProxy;
+    }
+    class InferredProject extends Project {
+        private static readonly newName;
+        private _isJsInferredProject;
+        toggleJsInferredProject(isJsInferredProject: boolean): void;
+        setCompilerOptions(options?: CompilerOptions): void;
+        readonly projectRootPath: string | undefined;
+        readonly canonicalCurrentDirectory: string | undefined;
+        constructor(projectService: ProjectService, documentRegistry: DocumentRegistry, compilerOptions: CompilerOptions, projectRootPath: NormalizedPath | undefined, currentDirectory: string | undefined);
+        addRoot(info: ScriptInfo): void;
+        removeRoot(info: ScriptInfo): void;
+        isOrphan(): boolean;
+        isProjectWithSingleRoot(): boolean;
+        close(): void;
+        getTypeAcquisition(): TypeAcquisition;
+    }
+    class ConfiguredProject extends Project {
+        compileOnSaveEnabled: boolean;
+        private projectReferences;
+        private typeAcquisition;
+        configFileWatcher: FileWatcher | undefined;
+        private directoriesWatchedForWildcards;
+        readonly canonicalConfigFilePath: NormalizedPath;
+        pendingReload: ConfigFileProgramReloadLevel;
+        configFileSpecs: ConfigFileSpecs | undefined;
+        private externalProjectRefCount;
+        private projectErrors;
+        constructor(configFileName: NormalizedPath, projectService: ProjectService, documentRegistry: DocumentRegistry, hasExplicitListOfFiles: boolean, compilerOptions: CompilerOptions, lastFileExceededProgramSize: string | undefined, compileOnSaveEnabled: boolean, cachedDirectoryStructureHost: CachedDirectoryStructureHost, projectReferences: ReadonlyArray<ProjectReference> | undefined);
+        updateGraph(): boolean;
+        getCachedDirectoryStructureHost(): CachedDirectoryStructureHost;
+        getConfigFilePath(): NormalizedPath;
+        getProjectReferences(): ReadonlyArray<ProjectReference> | undefined;
+        updateReferences(refs: ReadonlyArray<ProjectReference> | undefined): void;
+        enablePlugins(): void;
+        getGlobalProjectErrors(): ReadonlyArray<Diagnostic>;
+        getAllProjectErrors(): ReadonlyArray<Diagnostic>;
+        setProjectErrors(projectErrors: Diagnostic[]): void;
+        setTypeAcquisition(newTypeAcquisition: TypeAcquisition): void;
+        getTypeAcquisition(): TypeAcquisition;
+        watchWildcards(wildcardDirectories: Map<WatchDirectoryFlags>): void;
+        stopWatchingWildCards(): void;
+        close(): void;
+        addExternalProjectReference(): void;
+        deleteExternalProjectReference(): void;
+        hasOpenRef(): boolean;
+        getEffectiveTypeRoots(): string[];
+        updateErrorOnNoInputFiles(hasFileNames: boolean): void;
+    }
+    class ExternalProject extends Project {
+        externalProjectName: string;
+        compileOnSaveEnabled: boolean;
+        excludedFiles: ReadonlyArray<NormalizedPath>;
+        private typeAcquisition;
+        constructor(externalProjectName: string, projectService: ProjectService, documentRegistry: DocumentRegistry, compilerOptions: CompilerOptions, lastFileExceededProgramSize: string | undefined, compileOnSaveEnabled: boolean, projectFilePath?: string);
+        getExcludedFiles(): ReadonlyArray<NormalizedPath>;
+        getTypeAcquisition(): TypeAcquisition;
+        setTypeAcquisition(newTypeAcquisition: TypeAcquisition): void;
+    }
+}
+declare namespace ts.server {
+    const maxProgramSizeForNonTsFiles: number;
+    const ProjectsUpdatedInBackgroundEvent = "projectsUpdatedInBackground";
+    const ConfigFileDiagEvent = "configFileDiag";
+    const ProjectLanguageServiceStateEvent = "projectLanguageServiceState";
+    const ProjectInfoTelemetryEvent = "projectInfo";
+    const OpenFileInfoTelemetryEvent = "openFileInfo";
+    interface ProjectsUpdatedInBackgroundEvent {
+        eventName: typeof ProjectsUpdatedInBackgroundEvent;
+        data: {
+            openFiles: string[];
+        };
+    }
+    interface ConfigFileDiagEvent {
+        eventName: typeof ConfigFileDiagEvent;
+        data: {
+            triggerFile: string;
+            configFileName: string;
+            diagnostics: ReadonlyArray<Diagnostic>;
+        };
+    }
+    interface ProjectLanguageServiceStateEvent {
+        eventName: typeof ProjectLanguageServiceStateEvent;
+        data: {
+            project: Project;
+            languageServiceEnabled: boolean;
+        };
+    }
+    interface ProjectInfoTelemetryEvent {
+        readonly eventName: typeof ProjectInfoTelemetryEvent;
+        readonly data: ProjectInfoTelemetryEventData;
+    }
+    interface ProjectInfoTelemetryEventData {
+        readonly projectId: string;
+        readonly fileStats: FileStats;
+        readonly compilerOptions: CompilerOptions;
+        readonly extends: boolean | undefined;
+        readonly files: boolean | undefined;
+        readonly include: boolean | undefined;
+        readonly exclude: boolean | undefined;
+        readonly compileOnSave: boolean;
+        readonly typeAcquisition: ProjectInfoTypeAcquisitionData;
+        readonly configFileName: "tsconfig.json" | "jsconfig.json" | "other";
+        readonly projectType: "external" | "configured";
+        readonly languageServiceEnabled: boolean;
+        readonly version: string;
+    }
+    interface OpenFileInfoTelemetryEvent {
+        readonly eventName: typeof OpenFileInfoTelemetryEvent;
+        readonly data: OpenFileInfoTelemetryEventData;
+    }
+    interface OpenFileInfoTelemetryEventData {
+        readonly info: OpenFileInfo;
+    }
+    interface ProjectInfoTypeAcquisitionData {
+        readonly enable: boolean | undefined;
+        readonly include: boolean;
+        readonly exclude: boolean;
+    }
+    interface FileStats {
+        readonly js: number;
+        readonly jsx: number;
+        readonly ts: number;
+        readonly tsx: number;
+        readonly dts: number;
+        readonly deferred: number;
+    }
+    interface OpenFileInfo {
+        readonly checkJs: boolean;
+    }
+    type ProjectServiceEvent = ProjectsUpdatedInBackgroundEvent | ConfigFileDiagEvent | ProjectLanguageServiceStateEvent | ProjectInfoTelemetryEvent | OpenFileInfoTelemetryEvent;
+    type ProjectServiceEventHandler = (event: ProjectServiceEvent) => void;
+    interface SafeList {
+        [name: string]: {
+            match: RegExp;
+            exclude?: (string | number)[][];
+            types?: string[];
+        };
+    }
+    interface TypesMapFile {
+        typesMap: SafeList;
+        simpleMap: {
+            [libName: string]: string;
+        };
+    }
+    function convertFormatOptions(protocolOptions: protocol.FormatCodeSettings): FormatCodeSettings;
+    function convertCompilerOptions(protocolOptions: protocol.ExternalProjectCompilerOptions): CompilerOptions & protocol.CompileOnSaveMixin;
+    function tryConvertScriptKindName(scriptKindName: protocol.ScriptKindName | ScriptKind): ScriptKind;
+    function convertScriptKindName(scriptKindName: protocol.ScriptKindName): ScriptKind.Unknown | ScriptKind.JS | ScriptKind.JSX | ScriptKind.TS | ScriptKind.TSX;
+    interface HostConfiguration {
+        formatCodeOptions: FormatCodeSettings;
+        preferences: UserPreferences;
+        hostInfo: string;
+        extraFileExtensions?: FileExtensionInfo[];
+    }
+    interface OpenConfiguredProjectResult {
+        configFileName?: NormalizedPath;
+        configFileErrors?: ReadonlyArray<Diagnostic>;
+    }
+    enum WatchType {
+        ConfigFilePath = "Config file for the program",
+        MissingFilePath = "Missing file from program",
+        WildcardDirectories = "Wild card directory",
+        ClosedScriptInfo = "Closed Script info",
+        ConfigFileForInferredRoot = "Config file for the inferred project root",
+        FailedLookupLocation = "Directory of Failed lookup locations in module resolution",
+        TypeRoots = "Type root directory"
+    }
+    interface ConfigFileExistenceInfo {
+        exists: boolean;
+        openFilesImpactedByConfigFile: Map<boolean>;
+        configFileWatcherForRootOfInferredProject?: FileWatcher;
+    }
+    interface ProjectServiceOptions {
+        host: ServerHost;
+        logger: Logger;
+        cancellationToken: HostCancellationToken;
+        useSingleInferredProject: boolean;
+        useInferredProjectPerProjectRoot: boolean;
+        typingsInstaller: ITypingsInstaller;
+        eventHandler?: ProjectServiceEventHandler;
+        suppressDiagnosticEvents?: boolean;
+        throttleWaitMilliseconds?: number;
+        globalPlugins?: ReadonlyArray<string>;
+        pluginProbeLocations?: ReadonlyArray<string>;
+        allowLocalPluginLoads?: boolean;
+        typesMapLocation?: string;
+        syntaxOnly?: boolean;
+    }
+    class ProjectService {
+        readonly typingsCache: TypingsCache;
+        readonly documentRegistry: DocumentRegistry;
+        private readonly filenameToScriptInfo;
+        private readonly allJsFilesForOpenFileTelemetry;
+        readonly realpathToScriptInfos: MultiMap<ScriptInfo> | undefined;
+        private readonly externalProjectToConfiguredProjectMap;
+        readonly externalProjects: ExternalProject[];
+        readonly inferredProjects: InferredProject[];
+        readonly configuredProjects: Map<ConfiguredProject>;
+        readonly openFiles: Map<NormalizedPath | undefined>;
+        private readonly openFilesWithNonRootedDiskPath;
+        private compilerOptionsForInferredProjects;
+        private compilerOptionsForInferredProjectsPerProjectRoot;
+        private readonly projectToSizeMap;
+        private readonly configFileExistenceInfoCache;
+        private readonly throttledOperations;
+        private readonly hostConfiguration;
+        private safelist;
+        private legacySafelist;
+        private pendingProjectUpdates;
+        pendingEnsureProjectForOpenFiles: boolean;
+        readonly currentDirectory: NormalizedPath;
+        readonly toCanonicalFileName: (f: string) => string;
+        readonly host: ServerHost;
+        readonly logger: Logger;
+        readonly cancellationToken: HostCancellationToken;
+        readonly useSingleInferredProject: boolean;
+        readonly useInferredProjectPerProjectRoot: boolean;
+        readonly typingsInstaller: ITypingsInstaller;
+        private readonly globalCacheLocationDirectoryPath;
+        readonly throttleWaitMilliseconds?: number;
+        private readonly eventHandler?;
+        private readonly suppressDiagnosticEvents?;
+        readonly globalPlugins: ReadonlyArray<string>;
+        readonly pluginProbeLocations: ReadonlyArray<string>;
+        readonly allowLocalPluginLoads: boolean;
+        readonly typesMapLocation: string | undefined;
+        readonly syntaxOnly?: boolean;
+        private readonly seenProjects;
+        readonly watchFactory: WatchFactory<WatchType, Project>;
+        constructor(opts: ProjectServiceOptions);
+        toPath(fileName: string): Path;
+        getExecutingFilePath(): string;
+        getNormalizedAbsolutePath(fileName: string): string;
+        setDocument(key: DocumentRegistryBucketKey, path: Path, sourceFile: SourceFile): void;
+        getDocument(key: DocumentRegistryBucketKey, path: Path): SourceFile | undefined;
+        ensureInferredProjectsUpToDate_TestOnly(): void;
+        getCompilerOptionsForInferredProjects(): CompilerOptions;
+        onUpdateLanguageServiceStateForProject(project: Project, languageServiceEnabled: boolean): void;
+        private loadTypesMap;
+        updateTypingsForProject(response: SetTypings | InvalidateCachedTypings | PackageInstalledResponse): void;
+        updateTypingsForProject(response: SetTypings | InvalidateCachedTypings | PackageInstalledResponse | BeginInstallTypes | EndInstallTypes): void;
+        private delayEnsureProjectForOpenFiles;
+        private delayUpdateProjectGraph;
+        hasPendingProjectUpdate(project: Project): boolean;
+        sendProjectsUpdatedInBackgroundEvent(): void;
+        delayUpdateProjectGraphAndEnsureProjectStructureForOpenFiles(project: Project): void;
+        private delayUpdateProjectGraphs;
+        setCompilerOptionsForInferredProjects(projectCompilerOptions: protocol.ExternalProjectCompilerOptions, projectRootPath?: string): void;
+        findProject(projectName: string): Project | undefined;
+        getDefaultProjectForFile(fileName: NormalizedPath, ensureProject: boolean): Project | undefined;
+        getScriptInfoEnsuringProjectsUptoDate(uncheckedFileName: string): ScriptInfo | undefined;
+        private ensureProjectStructuresUptoDate;
+        getFormatCodeOptions(file: NormalizedPath): FormatCodeSettings;
+        getPreferences(file: NormalizedPath): UserPreferences;
+        private onSourceFileChanged;
+        private handleDeletedFile;
+        watchWildcardDirectory(directory: Path, flags: WatchDirectoryFlags, project: ConfiguredProject): FileWatcher;
+        getConfigFileExistenceInfo(project: ConfiguredProject): ConfigFileExistenceInfo;
+        private onConfigChangedForConfiguredProject;
+        private onConfigFileChangeForOpenScriptInfo;
+        private removeProject;
+        assignOrphanScriptInfoToInferredProject(info: ScriptInfo, projectRootPath: NormalizedPath | undefined): InferredProject;
+        private closeOpenFile;
+        private deleteScriptInfo;
+        private configFileExists;
+        private setConfigFileExistenceByNewConfiguredProject;
+        private configFileExistenceImpactsRootOfInferredProject;
+        private setConfigFileExistenceInfoByClosedConfiguredProject;
+        private logConfigFileWatchUpdate;
+        private createConfigFileWatcherOfConfigFileExistence;
+        private closeConfigFileWatcherOfConfigFileExistenceInfo;
+        private stopWatchingConfigFilesForClosedScriptInfo;
+        startWatchingConfigFilesForInferredProjectRoot(info: ScriptInfo): void;
+        stopWatchingConfigFilesForInferredProjectRoot(info: ScriptInfo): void;
+        private forEachConfigFileLocation;
+        private getConfigFileNameForFile;
+        private printProjects;
+        private findConfiguredProjectByProjectName;
+        private getConfiguredProjectByCanonicalConfigFilePath;
+        private findExternalProjectByProjectName;
+        private convertConfigFileContentToProjectOptions;
+        private getFilenameForExceededTotalSizeLimitForNonTsFiles;
+        private createExternalProject;
+        private sendProjectTelemetry;
+        private addFilesToNonInferredProjectAndUpdateGraph;
+        private createConfiguredProject;
+        private updateNonInferredProjectFiles;
+        private updateNonInferredProject;
+        reloadFileNamesOfConfiguredProject(project: ConfiguredProject): boolean;
+        reloadConfiguredProject(project: ConfiguredProject): void;
+        private sendConfigFileDiagEvent;
+        private getOrCreateInferredProjectForProjectRootPathIfEnabled;
+        private getOrCreateSingleInferredProjectIfEnabled;
+        private getOrCreateSingleInferredWithoutProjectRoot;
+        private createInferredProject;
+        getOrCreateScriptInfoNotOpenedByClient(uncheckedFileName: string, currentDirectory: string, hostToQueryFileExistsOn: DirectoryStructureHost): ScriptInfo | undefined;
+        getScriptInfo(uncheckedFileName: string): ScriptInfo | undefined;
+        getSymlinkedProjects(info: ScriptInfo): MultiMap<Project> | undefined;
+        private watchClosedScriptInfo;
+        private stopWatchingScriptInfo;
+        getOrCreateScriptInfoNotOpenedByClientForNormalizedPath(fileName: NormalizedPath, currentDirectory: string, scriptKind: ScriptKind | undefined, hasMixedContent: boolean | undefined, hostToQueryFileExistsOn: DirectoryStructureHost | undefined): ScriptInfo | undefined;
+        getOrCreateScriptInfoOpenedByClientForNormalizedPath(fileName: NormalizedPath, currentDirectory: string, fileContent: string | undefined, scriptKind: ScriptKind | undefined, hasMixedContent: boolean | undefined): ScriptInfo | undefined;
+        getOrCreateScriptInfoForNormalizedPath(fileName: NormalizedPath, openedByClient: boolean, fileContent?: string, scriptKind?: ScriptKind, hasMixedContent?: boolean, hostToQueryFileExistsOn?: {
+            fileExists(path: string): boolean;
+        }): ScriptInfo | undefined;
+        private getOrCreateScriptInfoWorker;
+        getScriptInfoForNormalizedPath(fileName: NormalizedPath): ScriptInfo | undefined;
+        getScriptInfoForPath(fileName: Path): ScriptInfo | undefined;
+        setHostConfiguration(args: protocol.ConfigureRequestArguments): void;
+        closeLog(): void;
+        reloadProjects(): void;
+        private delayReloadConfiguredProjectForFiles;
+        private reloadConfiguredProjectForFiles;
+        private removeRootOfInferredProjectIfNowPartOfOtherProject;
+        private ensureProjectForOpenFiles;
+        openClientFile(fileName: string, fileContent?: string, scriptKind?: ScriptKind, projectRootPath?: string): OpenConfiguredProjectResult;
+        private findExternalProjectContainingOpenScriptInfo;
+        openClientFileWithNormalizedPath(fileName: NormalizedPath, fileContent?: string, scriptKind?: ScriptKind, hasMixedContent?: boolean, projectRootPath?: NormalizedPath): OpenConfiguredProjectResult;
+        private telemetryOnOpenFile;
+        closeClientFile(uncheckedFileName: string): void;
+        private collectChanges;
+        synchronizeProjectList(knownProjects: protocol.ProjectVersionInfo[]): ProjectFilesWithTSDiagnostics[];
+        applyChangesInOpenFiles(openFiles: protocol.ExternalFile[] | undefined, changedFiles: protocol.ChangedOpenFile[] | undefined, closedFiles: string[] | undefined): void;
+        applyChangesToFile(scriptInfo: ScriptInfo, changes: TextChange[]): void;
+        private closeConfiguredProjectReferencedFromExternalProject;
+        closeExternalProject(uncheckedFileName: string): void;
+        openExternalProjects(projects: protocol.ExternalProject[]): void;
+        private static readonly filenameEscapeRegexp;
+        private static escapeFilenameForRegex;
+        resetSafeList(): void;
+        applySafeList(proj: protocol.ExternalProject): NormalizedPath[];
+        openExternalProject(proj: protocol.ExternalProject): void;
+        hasDeferredExtension(): boolean;
+    }
+}
+declare namespace ts.server {
+    interface ServerCancellationToken extends HostCancellationToken {
+        setRequest(requestId: number): void;
+        resetRequest(requestId: number): void;
+    }
+    const nullCancellationToken: ServerCancellationToken;
+    interface PendingErrorCheck {
+        fileName: NormalizedPath;
+        project: Project;
+    }
+    type CommandNames = protocol.CommandTypes;
+    const CommandNames: any;
+    function formatMessage<T extends protocol.Message>(msg: T, logger: Logger, byteLength: (s: string, encoding: string) => number, newLine: string): string;
+    type Event = <T extends object>(body: T, eventName: string) => void;
+    interface EventSender {
+        event: Event;
+    }
+    function toEvent(eventName: string, body: object): protocol.Event;
+    interface SessionOptions {
+        host: ServerHost;
+        cancellationToken: ServerCancellationToken;
+        useSingleInferredProject: boolean;
+        useInferredProjectPerProjectRoot: boolean;
+        typingsInstaller: ITypingsInstaller;
+        byteLength: (buf: string, encoding?: string) => number;
+        hrtime: (start?: number[]) => number[];
+        logger: Logger;
+        canUseEvents: boolean;
+        eventHandler?: ProjectServiceEventHandler;
+        suppressDiagnosticEvents?: boolean;
+        syntaxOnly?: boolean;
+        throttleWaitMilliseconds?: number;
+        noGetErrOnBackgroundUpdate?: boolean;
+        globalPlugins?: ReadonlyArray<string>;
+        pluginProbeLocations?: ReadonlyArray<string>;
+        allowLocalPluginLoads?: boolean;
+    }
+    class Session implements EventSender {
+        private readonly gcTimer;
+        protected projectService: ProjectService;
+        private changeSeq;
+        private currentRequestId;
+        private errorCheck;
+        protected host: ServerHost;
+        private readonly cancellationToken;
+        protected readonly typingsInstaller: ITypingsInstaller;
+        protected byteLength: (buf: string, encoding?: string) => number;
+        private hrtime;
+        protected logger: Logger;
+        protected canUseEvents: boolean;
+        private suppressDiagnosticEvents?;
+        private eventHandler;
+        private readonly noGetErrOnBackgroundUpdate?;
+        constructor(opts: SessionOptions);
+        private sendRequestCompletedEvent;
+        private defaultEventHandler;
+        private projectsUpdatedInBackgroundEvent;
+        logError(err: Error, cmd: string): void;
+        send(msg: protocol.Message): void;
+        event<T extends object>(body: T, eventName: string): void;
+        output(info: any, cmdName: string, reqSeq?: number, errorMsg?: string): void;
+        private doOutput;
+        private semanticCheck;
+        private syntacticCheck;
+        private suggestionCheck;
+        private sendDiagnosticsEvent;
+        private updateErrorCheck;
+        private cleanProjects;
+        private cleanup;
+        private getEncodedSemanticClassifications;
+        private getProject;
+        private getConfigFileAndProject;
+        private getConfigFileDiagnostics;
+        private convertToDiagnosticsWithLinePositionFromDiagnosticFile;
+        private getCompilerOptionsDiagnostics;
+        private convertToDiagnosticsWithLinePosition;
+        private getDiagnosticsWorker;
+        private getDefinition;
+        private getDefinitionAndBoundSpan;
+        private mapDefinitionInfo;
+        private static mapToOriginalLocation;
+        private toFileSpan;
+        private getTypeDefinition;
+        private getImplementation;
+        private getOccurrences;
+        private getSyntacticDiagnosticsSync;
+        private getSemanticDiagnosticsSync;
+        private getSuggestionDiagnosticsSync;
+        private getJsxClosingTag;
+        private getDocumentHighlights;
+        private setCompilerOptionsForInferredProjects;
+        private getProjectInfo;
+        private getProjectInfoWorker;
+        private getRenameInfo;
+        private getProjects;
+        private getDefaultProject;
+        private getRenameLocations;
+        private getReferences;
+        private openClientFile;
+        private getPosition;
+        private getPositionInFile;
+        private getFileAndProject;
+        private getFileAndLanguageServiceForSyntacticOperation;
+        private getFileAndProjectWorker;
+        private getOutliningSpans;
+        private getTodoComments;
+        private getDocCommentTemplate;
+        private getSpanOfEnclosingComment;
+        private getIndentation;
+        private getBreakpointStatement;
+        private getNameOrDottedNameSpan;
+        private isValidBraceCompletion;
+        private getQuickInfoWorker;
+        private getFormattingEditsForRange;
+        private getFormattingEditsForRangeFull;
+        private getFormattingEditsForDocumentFull;
+        private getFormattingEditsAfterKeystrokeFull;
+        private getFormattingEditsAfterKeystroke;
+        private getCompletions;
+        private getCompletionEntryDetails;
+        private getCompileOnSaveAffectedFileList;
+        private emitFile;
+        private getSignatureHelpItems;
+        private createCheckList;
+        private getDiagnostics;
+        private change;
+        private reload;
+        private saveToTmp;
+        private closeClientFile;
+        private mapLocationNavigationBarItems;
+        private getNavigationBarItems;
+        private toLocationNavigationTree;
+        private toLocationTextSpan;
+        private getNavigationTree;
+        private getNavigateToItems;
+        private getSupportedCodeFixes;
+        private isLocation;
+        private extractPositionAndRange;
+        private getApplicableRefactors;
+        private getEditsForRefactor;
+        private organizeImports;
+        private getEditsForFileRename;
+        private getCodeFixes;
+        private getCombinedCodeFix;
+        private applyCodeActionCommand;
+        private getStartAndEndPosition;
+        private mapCodeAction;
+        private mapCodeFixAction;
+        private mapTextChangesToCodeEdits;
+        private convertTextChangeToCodeEdit;
+        private getBraceMatching;
+        private getDiagnosticsForProject;
+        getCanonicalFileName(fileName: string): string;
+        exit(): void;
+        private notRequired;
+        private requiredResponse;
+        private handlers;
+        addProtocolHandler(command: string, handler: (request: protocol.Request) => HandlerResponse): void;
+        private setCurrentRequest;
+        private resetCurrentRequest;
+        executeWithRequestId<T>(requestId: number, f: () => T): T;
+        executeCommand(request: protocol.Request): HandlerResponse;
+        onMessage(message: string): void;
+        private getFormatOptions;
+        private getPreferences;
+    }
+    interface HandlerResponse {
+        response?: {};
+        responseRequired?: boolean;
+    }
+    function getLocationInNewDocument(oldText: string, renameFilename: string, renameLocation: number, edits: ReadonlyArray<FileTextChanges>): protocol.Location;
+}
+declare namespace ts.server {
+    interface LineCollection {
+        charCount(): number;
+        lineCount(): number;
+        isLeaf(): this is LineLeaf;
+        walk(rangeStart: number, rangeLength: number, walkFns: LineIndexWalker): void;
+    }
+    interface AbsolutePositionAndLineText {
+        absolutePosition: number;
+        lineText: string | undefined;
+    }
+    enum CharRangeSection {
+        PreStart = 0,
+        Start = 1,
+        Entire = 2,
+        Mid = 3,
+        End = 4,
+        PostEnd = 5
+    }
+    interface LineIndexWalker {
+        goSubtree: boolean;
+        done: boolean;
+        leaf(relativeStart: number, relativeLength: number, lineCollection: LineLeaf): void;
+        pre?(relativeStart: number, relativeLength: number, lineCollection: LineCollection, parent: LineNode, nodeType: CharRangeSection): void;
+        post?(relativeStart: number, relativeLength: number, lineCollection: LineCollection, parent: LineNode, nodeType: CharRangeSection): void;
+    }
+    class ScriptVersionCache {
+        private changes;
+        private readonly versions;
+        private minVersion;
+        private currentVersion;
+        private static readonly changeNumberThreshold;
+        private static readonly changeLengthThreshold;
+        private static readonly maxVersions;
+        private versionToIndex;
+        private currentVersionToIndex;
+        edit(pos: number, deleteLen: number, insertedText?: string): void;
+        getSnapshot(): IScriptSnapshot;
+        private _getSnapshot;
+        getSnapshotVersion(): number;
+        getLineInfo(line: number): AbsolutePositionAndLineText;
+        lineOffsetToPosition(line: number, column: number): number;
+        positionToLineOffset(position: number): protocol.Location;
+        lineToTextSpan(line: number): TextSpan;
+        getTextChangesBetweenVersions(oldVersion: number, newVersion: number): TextChangeRange | undefined;
+        static fromString(script: string): ScriptVersionCache;
+    }
+    class LineIndex {
+        root: LineNode;
+        checkEdits: boolean;
+        absolutePositionOfStartOfLine(oneBasedLine: number): number;
+        positionToLineOffset(position: number): protocol.Location;
+        private positionToColumnAndLineText;
+        lineNumberToInfo(oneBasedLine: number): AbsolutePositionAndLineText;
+        load(lines: string[]): void;
+        walk(rangeStart: number, rangeLength: number, walkFns: LineIndexWalker): void;
+        getText(rangeStart: number, rangeLength: number): string;
+        getLength(): number;
+        every(f: (ll: LineLeaf, s: number, len: number) => boolean, rangeStart: number, rangeEnd?: number): boolean;
+        edit(pos: number, deleteLength: number, newText?: string): LineIndex;
+        private static buildTreeFromBottom;
+        static linesFromText(text: string): {
+            lines: string[];
+            lineMap: number[];
+        };
+    }
+    class LineNode implements LineCollection {
+        private readonly children;
+        totalChars: number;
+        totalLines: number;
+        constructor(children?: LineCollection[]);
+        isLeaf(): boolean;
+        updateCounts(): void;
+        private execWalk;
+        private skipChild;
+        walk(rangeStart: number, rangeLength: number, walkFns: LineIndexWalker): void;
+        charOffsetToLineInfo(lineNumberAccumulator: number, relativePosition: number): {
+            oneBasedLine: number;
+            zeroBasedColumn: number;
+            lineText: string | undefined;
+        };
+        lineNumberToInfo(relativeOneBasedLine: number, positionAccumulator: number): {
+            position: number;
+            leaf: LineLeaf | undefined;
+        };
+        private splitAfter;
+        remove(child: LineCollection): void;
+        private findChildIndex;
+        insertAt(child: LineCollection, nodes: LineCollection[]): LineNode[];
+        add(collection: LineCollection): void;
+        charCount(): number;
+        lineCount(): number;
+    }
+    class LineLeaf implements LineCollection {
+        text: string;
+        constructor(text: string);
+        isLeaf(): boolean;
+        walk(rangeStart: number, rangeLength: number, walkFns: LineIndexWalker): void;
+        charCount(): number;
+        lineCount(): number;
+    }
+}
+//# sourceMappingURL=server.d.ts.map
 //# sourceMappingURL=tsserverlibrary.d.ts.map
 export = ts;
 export as namespace ts;
\ No newline at end of file

From ed20f7d9838bfd3cbe238c728f3da5b47059ef7c Mon Sep 17 00:00:00 2001
From: Andy <anhans@microsoft.com>
Date: Mon, 11 Jun 2018 13:10:29 -0700
Subject: [PATCH 34/37] Simplify tryDeleteDeclaration (#24808)

---
 src/services/codefixes/fixUnusedIdentifier.ts | 43 ++++++-------------
 1 file changed, 14 insertions(+), 29 deletions(-)

diff --git a/src/services/codefixes/fixUnusedIdentifier.ts b/src/services/codefixes/fixUnusedIdentifier.ts
index 719e3a316f7..ad3e2e36f5b 100644
--- a/src/services/codefixes/fixUnusedIdentifier.ts
+++ b/src/services/codefixes/fixUnusedIdentifier.ts
@@ -148,20 +148,9 @@ namespace ts.codefix {
         return false;
     }
 
-    function tryDeleteDeclaration(changes: textChanges.ChangeTracker, sourceFile: SourceFile, token: Node, deletedAncestors: NodeSet | undefined, checker: TypeChecker, isFixAll: boolean): void {
-        switch (token.kind) {
-            case SyntaxKind.Identifier:
-                tryDeleteIdentifier(changes, sourceFile, <Identifier>token, deletedAncestors, checker, isFixAll);
-                deleteAssignments(changes, sourceFile, token as Identifier, checker);
-                break;
-            case SyntaxKind.PropertyDeclaration:
-            case SyntaxKind.NamespaceImport:
-                if (deletedAncestors) deletedAncestors.add(token.parent);
-                changes.deleteNode(sourceFile, token.parent);
-                break;
-            default:
-                tryDeleteDefault(changes, sourceFile, token, deletedAncestors);
-        }
+    function tryDeleteDeclaration(changes: textChanges.ChangeTracker, sourceFile: SourceFile, token: Node, deletedAncestors: NodeSet | undefined, checker: TypeChecker, isFixAll: boolean) {
+        tryDeleteDeclarationWorker(changes, sourceFile, token, deletedAncestors, checker, isFixAll);
+        if (isIdentifier(token)) deleteAssignments(changes, sourceFile, token, checker);
     }
 
     function deleteAssignments(changes: textChanges.ChangeTracker, sourceFile: SourceFile, token: Identifier, checker: TypeChecker) {
@@ -173,19 +162,8 @@ namespace ts.codefix {
         });
     }
 
-    function tryDeleteDefault(changes: textChanges.ChangeTracker, sourceFile: SourceFile, token: Node, deletedAncestors: NodeSet | undefined): void {
-        if (isDeclarationName(token)) {
-            if (deletedAncestors) deletedAncestors.add(token.parent);
-            changes.deleteNode(sourceFile, token.parent);
-        }
-        else if (isLiteralComputedPropertyDeclarationName(token)) {
-            if (deletedAncestors) deletedAncestors.add(token.parent.parent);
-            changes.deleteNode(sourceFile, token.parent.parent);
-        }
-    }
-
-    function tryDeleteIdentifier(changes: textChanges.ChangeTracker, sourceFile: SourceFile, identifier: Identifier, deletedAncestors: NodeSet | undefined, checker: TypeChecker, isFixAll: boolean): void {
-        const parent = identifier.parent;
+    function tryDeleteDeclarationWorker(changes: textChanges.ChangeTracker, sourceFile: SourceFile, token: Node, deletedAncestors: NodeSet | undefined, checker: TypeChecker, isFixAll: boolean): void {
+        const parent = token.parent;
         switch (parent.kind) {
             case SyntaxKind.VariableDeclaration:
                 tryDeleteVariableDeclaration(changes, sourceFile, <VariableDeclaration>parent, deletedAncestors);
@@ -250,7 +228,7 @@ namespace ts.codefix {
 
             // handle case where 'import a = A;'
             case SyntaxKind.ImportEqualsDeclaration:
-                const importEquals = getAncestor(identifier, SyntaxKind.ImportEqualsDeclaration)!;
+                const importEquals = getAncestor(token, SyntaxKind.ImportEqualsDeclaration)!;
                 changes.deleteNode(sourceFile, importEquals);
                 break;
 
@@ -290,7 +268,14 @@ namespace ts.codefix {
                 break;
 
             default:
-                tryDeleteDefault(changes, sourceFile, identifier, deletedAncestors);
+                if (isDeclarationName(token)) {
+                    if (deletedAncestors) deletedAncestors.add(token.parent);
+                    changes.deleteNode(sourceFile, token.parent);
+                }
+                else if (isLiteralComputedPropertyDeclarationName(token)) {
+                    if (deletedAncestors) deletedAncestors.add(token.parent.parent);
+                    changes.deleteNode(sourceFile, token.parent.parent);
+                }
                 break;
         }
     }

From 47d34cb789d7527e136dbfd5c2ee0266d0e236a2 Mon Sep 17 00:00:00 2001
From: Ryan Cavanaugh <RyanCavanaugh@users.noreply.github.com>
Date: Mon, 11 Jun 2018 13:27:30 -0700
Subject: [PATCH 35/37] Accept baselines

---
 .../diagnosticInformationMap.generated.ts     |   3 +
 src/parser/diagnosticMessages.generated.json  |   5 +-
 .../reference/APISample_Watch.errors.txt      | 154 +++++++++---------
 .../APISample_WatchWithDefaults.errors.txt    | 154 +++++++++---------
 ...APISample_WatchWithOwnWatchHost.errors.txt | 154 +++++++++---------
 .../reference/APISample_compile.errors.txt    | 154 +++++++++---------
 .../reference/APISample_jsdoc.errors.txt      | 154 +++++++++---------
 .../reference/APISample_linter.errors.txt     | 154 +++++++++---------
 .../APISample_parseConfig.errors.txt          | 154 +++++++++---------
 .../reference/APISample_transform.errors.txt  | 154 +++++++++---------
 .../reference/APISample_watcher.errors.txt    | 154 +++++++++---------
 .../reference/api/tsserverlibrary.d.ts        |   6 +
 tests/baselines/reference/api/typescript.d.ts |   6 +
 13 files changed, 721 insertions(+), 685 deletions(-)

diff --git a/src/parser/diagnosticInformationMap.generated.ts b/src/parser/diagnosticInformationMap.generated.ts
index 08a4709d681..81c65e998ed 100644
--- a/src/parser/diagnosticInformationMap.generated.ts
+++ b/src/parser/diagnosticInformationMap.generated.ts
@@ -1103,5 +1103,8 @@ namespace ts {
         Convert_0_to_mapped_object_type: diag(95055, DiagnosticCategory.Message, "Convert_0_to_mapped_object_type_95055", "Convert '{0}' to mapped object type"),
         Convert_namespace_import_to_named_imports: diag(95056, DiagnosticCategory.Message, "Convert_namespace_import_to_named_imports_95056", "Convert namespace import to named imports"),
         Convert_named_imports_to_namespace_import: diag(95057, DiagnosticCategory.Message, "Convert_named_imports_to_namespace_import_95057", "Convert named imports to namespace import"),
+        Add_or_remove_braces_in_an_arrow_function: diag(95058, DiagnosticCategory.Message, "Add_or_remove_braces_in_an_arrow_function_95058", "Add or remove braces in an arrow function"),
+        Add_braces_to_arrow_function: diag(95059, DiagnosticCategory.Message, "Add_braces_to_arrow_function_95059", "Add braces to arrow function"),
+        Remove_braces_from_arrow_function: diag(95060, DiagnosticCategory.Message, "Remove_braces_from_arrow_function_95060", "Remove braces from arrow function"),
     };
 }
\ No newline at end of file
diff --git a/src/parser/diagnosticMessages.generated.json b/src/parser/diagnosticMessages.generated.json
index 1869d9e43e7..7174b3a06f6 100644
--- a/src/parser/diagnosticMessages.generated.json
+++ b/src/parser/diagnosticMessages.generated.json
@@ -1094,5 +1094,8 @@
   "Remove_all_unused_labels_95054" : "Remove all unused labels",
   "Convert_0_to_mapped_object_type_95055" : "Convert '{0}' to mapped object type",
   "Convert_namespace_import_to_named_imports_95056" : "Convert namespace import to named imports",
-  "Convert_named_imports_to_namespace_import_95057" : "Convert named imports to namespace import"
+  "Convert_named_imports_to_namespace_import_95057" : "Convert named imports to namespace import",
+  "Add_or_remove_braces_in_an_arrow_function_95058" : "Add or remove braces in an arrow function",
+  "Add_braces_to_arrow_function_95059" : "Add braces to arrow function",
+  "Remove_braces_from_arrow_function_95060" : "Remove braces from arrow function"
 }
\ No newline at end of file
diff --git a/tests/baselines/reference/APISample_Watch.errors.txt b/tests/baselines/reference/APISample_Watch.errors.txt
index 3c67e72a48d..bb02ed2b9a2 100644
--- a/tests/baselines/reference/APISample_Watch.errors.txt
+++ b/tests/baselines/reference/APISample_Watch.errors.txt
@@ -1,79 +1,75 @@
 typescript_standalone.d.ts(21,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(21,41): error TS1005: ';' expected.
-typescript_standalone.d.ts(8907,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(8907,42): error TS1005: ';' expected.
-typescript_standalone.d.ts(9167,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(9167,46): error TS1005: ';' expected.
-typescript_standalone.d.ts(9517,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(9517,36): error TS1005: ';' expected.
-typescript_standalone.d.ts(9541,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(9541,36): error TS1005: ';' expected.
-typescript_standalone.d.ts(9628,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(9628,38): error TS1005: ';' expected.
-typescript_standalone.d.ts(10792,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10792,57): error TS1005: ';' expected.
-typescript_standalone.d.ts(10803,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10803,41): error TS1005: ';' expected.
-typescript_standalone.d.ts(10813,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10813,48): error TS1005: ';' expected.
-typescript_standalone.d.ts(10888,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10888,47): error TS1005: ';' expected.
-typescript_standalone.d.ts(10945,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10945,47): error TS1005: ';' expected.
-typescript_standalone.d.ts(10999,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10999,52): error TS1005: ';' expected.
-typescript_standalone.d.ts(11019,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11019,44): error TS1005: ';' expected.
-typescript_standalone.d.ts(11029,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11029,35): error TS1005: ';' expected.
-typescript_standalone.d.ts(11063,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11063,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11066,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11066,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(8910,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(8910,42): error TS1005: ';' expected.
+typescript_standalone.d.ts(9170,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9170,46): error TS1005: ';' expected.
+typescript_standalone.d.ts(9520,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9520,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(9544,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9544,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(9631,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9631,38): error TS1005: ';' expected.
+typescript_standalone.d.ts(10796,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10796,57): error TS1005: ';' expected.
+typescript_standalone.d.ts(10807,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10807,41): error TS1005: ';' expected.
+typescript_standalone.d.ts(10817,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10817,48): error TS1005: ';' expected.
+typescript_standalone.d.ts(10892,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10892,47): error TS1005: ';' expected.
+typescript_standalone.d.ts(10949,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10949,47): error TS1005: ';' expected.
+typescript_standalone.d.ts(11003,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11003,52): error TS1005: ';' expected.
+typescript_standalone.d.ts(11023,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11023,44): error TS1005: ';' expected.
+typescript_standalone.d.ts(11033,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11033,35): error TS1005: ';' expected.
+typescript_standalone.d.ts(11067,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11067,40): error TS1005: ';' expected.
 typescript_standalone.d.ts(11070,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11070,45): error TS1005: ';' expected.
-typescript_standalone.d.ts(11088,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11088,56): error TS1005: ';' expected.
-typescript_standalone.d.ts(11114,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11114,36): error TS1005: ';' expected.
-typescript_standalone.d.ts(11117,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11117,43): error TS1005: ';' expected.
-typescript_standalone.d.ts(11129,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11129,43): error TS1005: ';' expected.
-typescript_standalone.d.ts(11159,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11159,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11193,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11193,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11204,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11204,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11228,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11228,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11236,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11236,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11070,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11074,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11074,45): error TS1005: ';' expected.
+typescript_standalone.d.ts(11092,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11092,56): error TS1005: ';' expected.
+typescript_standalone.d.ts(11118,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11118,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(11121,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11121,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11133,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11133,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11163,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11163,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11197,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11197,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11208,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11208,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11232,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11232,40): error TS1005: ';' expected.
 typescript_standalone.d.ts(11240,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11240,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11270,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11270,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11313,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11313,41): error TS1005: ';' expected.
-typescript_standalone.d.ts(11500,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11500,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11502,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11502,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11244,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11244,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11274,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11274,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11317,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11317,41): error TS1005: ';' expected.
+typescript_standalone.d.ts(11504,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11504,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11506,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11506,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11508,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11508,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11510,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11510,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11512,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11512,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11514,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11514,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11523,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11523,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11525,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11525,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11516,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11516,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11518,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11518,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11527,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11527,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11529,28): error TS1005: ';' expected.
@@ -100,10 +96,10 @@ typescript_standalone.d.ts(11549,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11549,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11551,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11551,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11561,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11561,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11563,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11563,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11553,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11553,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11555,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11555,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11565,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11565,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11567,28): error TS1005: ';' expected.
@@ -115,17 +111,23 @@ typescript_standalone.d.ts(11571,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11573,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11573,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11575,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11575,72): error TS1005: ';' expected.
+typescript_standalone.d.ts(11575,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11577,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11577,52): error TS1005: ';' expected.
-typescript_standalone.d.ts(11649,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11649,72): error TS1005: ';' expected.
-typescript_standalone.d.ts(11651,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11651,38): error TS1005: ';' expected.
+typescript_standalone.d.ts(11577,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11579,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11579,72): error TS1005: ';' expected.
+typescript_standalone.d.ts(11581,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11581,52): error TS1005: ';' expected.
 typescript_standalone.d.ts(11653,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11653,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11729,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11729,48): error TS1005: ';' expected.
+typescript_standalone.d.ts(11653,72): error TS1005: ';' expected.
+typescript_standalone.d.ts(11655,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11655,38): error TS1005: ';' expected.
+typescript_standalone.d.ts(11657,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11657,71): error TS1005: ';' expected.
+typescript_standalone.d.ts(11659,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11659,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11735,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11735,48): error TS1005: ';' expected.
 
 
 ==== tests/cases/compiler/APISample_Watch.ts (0 errors) ====
diff --git a/tests/baselines/reference/APISample_WatchWithDefaults.errors.txt b/tests/baselines/reference/APISample_WatchWithDefaults.errors.txt
index 71644875d09..8f1d89b4845 100644
--- a/tests/baselines/reference/APISample_WatchWithDefaults.errors.txt
+++ b/tests/baselines/reference/APISample_WatchWithDefaults.errors.txt
@@ -1,79 +1,75 @@
 typescript_standalone.d.ts(21,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(21,41): error TS1005: ';' expected.
-typescript_standalone.d.ts(8907,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(8907,42): error TS1005: ';' expected.
-typescript_standalone.d.ts(9167,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(9167,46): error TS1005: ';' expected.
-typescript_standalone.d.ts(9517,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(9517,36): error TS1005: ';' expected.
-typescript_standalone.d.ts(9541,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(9541,36): error TS1005: ';' expected.
-typescript_standalone.d.ts(9628,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(9628,38): error TS1005: ';' expected.
-typescript_standalone.d.ts(10792,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10792,57): error TS1005: ';' expected.
-typescript_standalone.d.ts(10803,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10803,41): error TS1005: ';' expected.
-typescript_standalone.d.ts(10813,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10813,48): error TS1005: ';' expected.
-typescript_standalone.d.ts(10888,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10888,47): error TS1005: ';' expected.
-typescript_standalone.d.ts(10945,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10945,47): error TS1005: ';' expected.
-typescript_standalone.d.ts(10999,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10999,52): error TS1005: ';' expected.
-typescript_standalone.d.ts(11019,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11019,44): error TS1005: ';' expected.
-typescript_standalone.d.ts(11029,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11029,35): error TS1005: ';' expected.
-typescript_standalone.d.ts(11063,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11063,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11066,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11066,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(8910,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(8910,42): error TS1005: ';' expected.
+typescript_standalone.d.ts(9170,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9170,46): error TS1005: ';' expected.
+typescript_standalone.d.ts(9520,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9520,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(9544,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9544,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(9631,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9631,38): error TS1005: ';' expected.
+typescript_standalone.d.ts(10796,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10796,57): error TS1005: ';' expected.
+typescript_standalone.d.ts(10807,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10807,41): error TS1005: ';' expected.
+typescript_standalone.d.ts(10817,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10817,48): error TS1005: ';' expected.
+typescript_standalone.d.ts(10892,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10892,47): error TS1005: ';' expected.
+typescript_standalone.d.ts(10949,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10949,47): error TS1005: ';' expected.
+typescript_standalone.d.ts(11003,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11003,52): error TS1005: ';' expected.
+typescript_standalone.d.ts(11023,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11023,44): error TS1005: ';' expected.
+typescript_standalone.d.ts(11033,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11033,35): error TS1005: ';' expected.
+typescript_standalone.d.ts(11067,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11067,40): error TS1005: ';' expected.
 typescript_standalone.d.ts(11070,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11070,45): error TS1005: ';' expected.
-typescript_standalone.d.ts(11088,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11088,56): error TS1005: ';' expected.
-typescript_standalone.d.ts(11114,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11114,36): error TS1005: ';' expected.
-typescript_standalone.d.ts(11117,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11117,43): error TS1005: ';' expected.
-typescript_standalone.d.ts(11129,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11129,43): error TS1005: ';' expected.
-typescript_standalone.d.ts(11159,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11159,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11193,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11193,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11204,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11204,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11228,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11228,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11236,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11236,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11070,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11074,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11074,45): error TS1005: ';' expected.
+typescript_standalone.d.ts(11092,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11092,56): error TS1005: ';' expected.
+typescript_standalone.d.ts(11118,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11118,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(11121,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11121,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11133,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11133,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11163,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11163,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11197,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11197,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11208,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11208,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11232,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11232,40): error TS1005: ';' expected.
 typescript_standalone.d.ts(11240,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11240,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11270,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11270,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11313,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11313,41): error TS1005: ';' expected.
-typescript_standalone.d.ts(11500,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11500,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11502,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11502,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11244,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11244,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11274,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11274,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11317,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11317,41): error TS1005: ';' expected.
+typescript_standalone.d.ts(11504,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11504,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11506,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11506,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11508,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11508,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11510,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11510,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11512,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11512,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11514,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11514,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11523,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11523,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11525,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11525,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11516,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11516,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11518,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11518,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11527,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11527,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11529,28): error TS1005: ';' expected.
@@ -100,10 +96,10 @@ typescript_standalone.d.ts(11549,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11549,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11551,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11551,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11561,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11561,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11563,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11563,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11553,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11553,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11555,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11555,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11565,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11565,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11567,28): error TS1005: ';' expected.
@@ -115,17 +111,23 @@ typescript_standalone.d.ts(11571,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11573,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11573,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11575,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11575,72): error TS1005: ';' expected.
+typescript_standalone.d.ts(11575,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11577,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11577,52): error TS1005: ';' expected.
-typescript_standalone.d.ts(11649,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11649,72): error TS1005: ';' expected.
-typescript_standalone.d.ts(11651,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11651,38): error TS1005: ';' expected.
+typescript_standalone.d.ts(11577,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11579,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11579,72): error TS1005: ';' expected.
+typescript_standalone.d.ts(11581,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11581,52): error TS1005: ';' expected.
 typescript_standalone.d.ts(11653,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11653,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11729,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11729,48): error TS1005: ';' expected.
+typescript_standalone.d.ts(11653,72): error TS1005: ';' expected.
+typescript_standalone.d.ts(11655,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11655,38): error TS1005: ';' expected.
+typescript_standalone.d.ts(11657,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11657,71): error TS1005: ';' expected.
+typescript_standalone.d.ts(11659,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11659,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11735,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11735,48): error TS1005: ';' expected.
 
 
 ==== tests/cases/compiler/APISample_WatchWithDefaults.ts (0 errors) ====
diff --git a/tests/baselines/reference/APISample_WatchWithOwnWatchHost.errors.txt b/tests/baselines/reference/APISample_WatchWithOwnWatchHost.errors.txt
index e6e6e3b83da..ee60b5c0d9f 100644
--- a/tests/baselines/reference/APISample_WatchWithOwnWatchHost.errors.txt
+++ b/tests/baselines/reference/APISample_WatchWithOwnWatchHost.errors.txt
@@ -1,79 +1,75 @@
 typescript_standalone.d.ts(21,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(21,41): error TS1005: ';' expected.
-typescript_standalone.d.ts(8907,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(8907,42): error TS1005: ';' expected.
-typescript_standalone.d.ts(9167,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(9167,46): error TS1005: ';' expected.
-typescript_standalone.d.ts(9517,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(9517,36): error TS1005: ';' expected.
-typescript_standalone.d.ts(9541,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(9541,36): error TS1005: ';' expected.
-typescript_standalone.d.ts(9628,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(9628,38): error TS1005: ';' expected.
-typescript_standalone.d.ts(10792,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10792,57): error TS1005: ';' expected.
-typescript_standalone.d.ts(10803,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10803,41): error TS1005: ';' expected.
-typescript_standalone.d.ts(10813,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10813,48): error TS1005: ';' expected.
-typescript_standalone.d.ts(10888,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10888,47): error TS1005: ';' expected.
-typescript_standalone.d.ts(10945,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10945,47): error TS1005: ';' expected.
-typescript_standalone.d.ts(10999,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10999,52): error TS1005: ';' expected.
-typescript_standalone.d.ts(11019,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11019,44): error TS1005: ';' expected.
-typescript_standalone.d.ts(11029,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11029,35): error TS1005: ';' expected.
-typescript_standalone.d.ts(11063,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11063,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11066,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11066,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(8910,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(8910,42): error TS1005: ';' expected.
+typescript_standalone.d.ts(9170,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9170,46): error TS1005: ';' expected.
+typescript_standalone.d.ts(9520,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9520,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(9544,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9544,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(9631,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9631,38): error TS1005: ';' expected.
+typescript_standalone.d.ts(10796,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10796,57): error TS1005: ';' expected.
+typescript_standalone.d.ts(10807,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10807,41): error TS1005: ';' expected.
+typescript_standalone.d.ts(10817,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10817,48): error TS1005: ';' expected.
+typescript_standalone.d.ts(10892,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10892,47): error TS1005: ';' expected.
+typescript_standalone.d.ts(10949,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10949,47): error TS1005: ';' expected.
+typescript_standalone.d.ts(11003,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11003,52): error TS1005: ';' expected.
+typescript_standalone.d.ts(11023,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11023,44): error TS1005: ';' expected.
+typescript_standalone.d.ts(11033,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11033,35): error TS1005: ';' expected.
+typescript_standalone.d.ts(11067,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11067,40): error TS1005: ';' expected.
 typescript_standalone.d.ts(11070,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11070,45): error TS1005: ';' expected.
-typescript_standalone.d.ts(11088,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11088,56): error TS1005: ';' expected.
-typescript_standalone.d.ts(11114,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11114,36): error TS1005: ';' expected.
-typescript_standalone.d.ts(11117,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11117,43): error TS1005: ';' expected.
-typescript_standalone.d.ts(11129,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11129,43): error TS1005: ';' expected.
-typescript_standalone.d.ts(11159,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11159,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11193,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11193,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11204,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11204,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11228,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11228,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11236,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11236,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11070,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11074,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11074,45): error TS1005: ';' expected.
+typescript_standalone.d.ts(11092,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11092,56): error TS1005: ';' expected.
+typescript_standalone.d.ts(11118,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11118,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(11121,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11121,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11133,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11133,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11163,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11163,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11197,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11197,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11208,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11208,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11232,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11232,40): error TS1005: ';' expected.
 typescript_standalone.d.ts(11240,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11240,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11270,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11270,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11313,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11313,41): error TS1005: ';' expected.
-typescript_standalone.d.ts(11500,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11500,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11502,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11502,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11244,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11244,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11274,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11274,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11317,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11317,41): error TS1005: ';' expected.
+typescript_standalone.d.ts(11504,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11504,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11506,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11506,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11508,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11508,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11510,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11510,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11512,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11512,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11514,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11514,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11523,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11523,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11525,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11525,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11516,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11516,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11518,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11518,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11527,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11527,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11529,28): error TS1005: ';' expected.
@@ -100,10 +96,10 @@ typescript_standalone.d.ts(11549,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11549,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11551,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11551,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11561,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11561,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11563,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11563,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11553,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11553,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11555,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11555,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11565,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11565,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11567,28): error TS1005: ';' expected.
@@ -115,17 +111,23 @@ typescript_standalone.d.ts(11571,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11573,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11573,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11575,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11575,72): error TS1005: ';' expected.
+typescript_standalone.d.ts(11575,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11577,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11577,52): error TS1005: ';' expected.
-typescript_standalone.d.ts(11649,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11649,72): error TS1005: ';' expected.
-typescript_standalone.d.ts(11651,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11651,38): error TS1005: ';' expected.
+typescript_standalone.d.ts(11577,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11579,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11579,72): error TS1005: ';' expected.
+typescript_standalone.d.ts(11581,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11581,52): error TS1005: ';' expected.
 typescript_standalone.d.ts(11653,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11653,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11729,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11729,48): error TS1005: ';' expected.
+typescript_standalone.d.ts(11653,72): error TS1005: ';' expected.
+typescript_standalone.d.ts(11655,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11655,38): error TS1005: ';' expected.
+typescript_standalone.d.ts(11657,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11657,71): error TS1005: ';' expected.
+typescript_standalone.d.ts(11659,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11659,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11735,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11735,48): error TS1005: ';' expected.
 
 
 ==== tests/cases/compiler/APISample_WatchWithOwnWatchHost.ts (0 errors) ====
diff --git a/tests/baselines/reference/APISample_compile.errors.txt b/tests/baselines/reference/APISample_compile.errors.txt
index 14e43e3dbac..2b730ac576f 100644
--- a/tests/baselines/reference/APISample_compile.errors.txt
+++ b/tests/baselines/reference/APISample_compile.errors.txt
@@ -1,79 +1,75 @@
 typescript_standalone.d.ts(21,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(21,41): error TS1005: ';' expected.
-typescript_standalone.d.ts(8907,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(8907,42): error TS1005: ';' expected.
-typescript_standalone.d.ts(9167,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(9167,46): error TS1005: ';' expected.
-typescript_standalone.d.ts(9517,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(9517,36): error TS1005: ';' expected.
-typescript_standalone.d.ts(9541,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(9541,36): error TS1005: ';' expected.
-typescript_standalone.d.ts(9628,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(9628,38): error TS1005: ';' expected.
-typescript_standalone.d.ts(10792,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10792,57): error TS1005: ';' expected.
-typescript_standalone.d.ts(10803,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10803,41): error TS1005: ';' expected.
-typescript_standalone.d.ts(10813,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10813,48): error TS1005: ';' expected.
-typescript_standalone.d.ts(10888,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10888,47): error TS1005: ';' expected.
-typescript_standalone.d.ts(10945,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10945,47): error TS1005: ';' expected.
-typescript_standalone.d.ts(10999,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10999,52): error TS1005: ';' expected.
-typescript_standalone.d.ts(11019,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11019,44): error TS1005: ';' expected.
-typescript_standalone.d.ts(11029,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11029,35): error TS1005: ';' expected.
-typescript_standalone.d.ts(11063,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11063,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11066,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11066,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(8910,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(8910,42): error TS1005: ';' expected.
+typescript_standalone.d.ts(9170,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9170,46): error TS1005: ';' expected.
+typescript_standalone.d.ts(9520,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9520,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(9544,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9544,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(9631,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9631,38): error TS1005: ';' expected.
+typescript_standalone.d.ts(10796,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10796,57): error TS1005: ';' expected.
+typescript_standalone.d.ts(10807,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10807,41): error TS1005: ';' expected.
+typescript_standalone.d.ts(10817,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10817,48): error TS1005: ';' expected.
+typescript_standalone.d.ts(10892,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10892,47): error TS1005: ';' expected.
+typescript_standalone.d.ts(10949,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10949,47): error TS1005: ';' expected.
+typescript_standalone.d.ts(11003,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11003,52): error TS1005: ';' expected.
+typescript_standalone.d.ts(11023,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11023,44): error TS1005: ';' expected.
+typescript_standalone.d.ts(11033,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11033,35): error TS1005: ';' expected.
+typescript_standalone.d.ts(11067,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11067,40): error TS1005: ';' expected.
 typescript_standalone.d.ts(11070,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11070,45): error TS1005: ';' expected.
-typescript_standalone.d.ts(11088,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11088,56): error TS1005: ';' expected.
-typescript_standalone.d.ts(11114,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11114,36): error TS1005: ';' expected.
-typescript_standalone.d.ts(11117,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11117,43): error TS1005: ';' expected.
-typescript_standalone.d.ts(11129,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11129,43): error TS1005: ';' expected.
-typescript_standalone.d.ts(11159,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11159,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11193,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11193,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11204,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11204,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11228,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11228,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11236,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11236,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11070,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11074,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11074,45): error TS1005: ';' expected.
+typescript_standalone.d.ts(11092,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11092,56): error TS1005: ';' expected.
+typescript_standalone.d.ts(11118,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11118,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(11121,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11121,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11133,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11133,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11163,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11163,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11197,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11197,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11208,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11208,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11232,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11232,40): error TS1005: ';' expected.
 typescript_standalone.d.ts(11240,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11240,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11270,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11270,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11313,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11313,41): error TS1005: ';' expected.
-typescript_standalone.d.ts(11500,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11500,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11502,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11502,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11244,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11244,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11274,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11274,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11317,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11317,41): error TS1005: ';' expected.
+typescript_standalone.d.ts(11504,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11504,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11506,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11506,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11508,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11508,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11510,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11510,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11512,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11512,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11514,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11514,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11523,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11523,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11525,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11525,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11516,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11516,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11518,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11518,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11527,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11527,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11529,28): error TS1005: ';' expected.
@@ -100,10 +96,10 @@ typescript_standalone.d.ts(11549,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11549,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11551,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11551,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11561,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11561,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11563,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11563,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11553,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11553,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11555,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11555,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11565,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11565,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11567,28): error TS1005: ';' expected.
@@ -115,17 +111,23 @@ typescript_standalone.d.ts(11571,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11573,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11573,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11575,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11575,72): error TS1005: ';' expected.
+typescript_standalone.d.ts(11575,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11577,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11577,52): error TS1005: ';' expected.
-typescript_standalone.d.ts(11649,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11649,72): error TS1005: ';' expected.
-typescript_standalone.d.ts(11651,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11651,38): error TS1005: ';' expected.
+typescript_standalone.d.ts(11577,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11579,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11579,72): error TS1005: ';' expected.
+typescript_standalone.d.ts(11581,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11581,52): error TS1005: ';' expected.
 typescript_standalone.d.ts(11653,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11653,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11729,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11729,48): error TS1005: ';' expected.
+typescript_standalone.d.ts(11653,72): error TS1005: ';' expected.
+typescript_standalone.d.ts(11655,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11655,38): error TS1005: ';' expected.
+typescript_standalone.d.ts(11657,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11657,71): error TS1005: ';' expected.
+typescript_standalone.d.ts(11659,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11659,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11735,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11735,48): error TS1005: ';' expected.
 
 
 ==== tests/cases/compiler/APISample_compile.ts (0 errors) ====
diff --git a/tests/baselines/reference/APISample_jsdoc.errors.txt b/tests/baselines/reference/APISample_jsdoc.errors.txt
index 790b59f2d54..02ac0d0fbf5 100644
--- a/tests/baselines/reference/APISample_jsdoc.errors.txt
+++ b/tests/baselines/reference/APISample_jsdoc.errors.txt
@@ -1,79 +1,75 @@
 typescript_standalone.d.ts(21,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(21,41): error TS1005: ';' expected.
-typescript_standalone.d.ts(8907,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(8907,42): error TS1005: ';' expected.
-typescript_standalone.d.ts(9167,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(9167,46): error TS1005: ';' expected.
-typescript_standalone.d.ts(9517,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(9517,36): error TS1005: ';' expected.
-typescript_standalone.d.ts(9541,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(9541,36): error TS1005: ';' expected.
-typescript_standalone.d.ts(9628,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(9628,38): error TS1005: ';' expected.
-typescript_standalone.d.ts(10792,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10792,57): error TS1005: ';' expected.
-typescript_standalone.d.ts(10803,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10803,41): error TS1005: ';' expected.
-typescript_standalone.d.ts(10813,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10813,48): error TS1005: ';' expected.
-typescript_standalone.d.ts(10888,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10888,47): error TS1005: ';' expected.
-typescript_standalone.d.ts(10945,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10945,47): error TS1005: ';' expected.
-typescript_standalone.d.ts(10999,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10999,52): error TS1005: ';' expected.
-typescript_standalone.d.ts(11019,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11019,44): error TS1005: ';' expected.
-typescript_standalone.d.ts(11029,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11029,35): error TS1005: ';' expected.
-typescript_standalone.d.ts(11063,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11063,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11066,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11066,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(8910,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(8910,42): error TS1005: ';' expected.
+typescript_standalone.d.ts(9170,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9170,46): error TS1005: ';' expected.
+typescript_standalone.d.ts(9520,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9520,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(9544,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9544,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(9631,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9631,38): error TS1005: ';' expected.
+typescript_standalone.d.ts(10796,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10796,57): error TS1005: ';' expected.
+typescript_standalone.d.ts(10807,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10807,41): error TS1005: ';' expected.
+typescript_standalone.d.ts(10817,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10817,48): error TS1005: ';' expected.
+typescript_standalone.d.ts(10892,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10892,47): error TS1005: ';' expected.
+typescript_standalone.d.ts(10949,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10949,47): error TS1005: ';' expected.
+typescript_standalone.d.ts(11003,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11003,52): error TS1005: ';' expected.
+typescript_standalone.d.ts(11023,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11023,44): error TS1005: ';' expected.
+typescript_standalone.d.ts(11033,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11033,35): error TS1005: ';' expected.
+typescript_standalone.d.ts(11067,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11067,40): error TS1005: ';' expected.
 typescript_standalone.d.ts(11070,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11070,45): error TS1005: ';' expected.
-typescript_standalone.d.ts(11088,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11088,56): error TS1005: ';' expected.
-typescript_standalone.d.ts(11114,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11114,36): error TS1005: ';' expected.
-typescript_standalone.d.ts(11117,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11117,43): error TS1005: ';' expected.
-typescript_standalone.d.ts(11129,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11129,43): error TS1005: ';' expected.
-typescript_standalone.d.ts(11159,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11159,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11193,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11193,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11204,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11204,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11228,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11228,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11236,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11236,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11070,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11074,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11074,45): error TS1005: ';' expected.
+typescript_standalone.d.ts(11092,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11092,56): error TS1005: ';' expected.
+typescript_standalone.d.ts(11118,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11118,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(11121,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11121,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11133,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11133,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11163,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11163,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11197,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11197,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11208,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11208,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11232,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11232,40): error TS1005: ';' expected.
 typescript_standalone.d.ts(11240,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11240,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11270,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11270,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11313,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11313,41): error TS1005: ';' expected.
-typescript_standalone.d.ts(11500,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11500,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11502,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11502,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11244,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11244,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11274,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11274,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11317,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11317,41): error TS1005: ';' expected.
+typescript_standalone.d.ts(11504,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11504,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11506,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11506,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11508,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11508,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11510,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11510,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11512,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11512,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11514,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11514,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11523,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11523,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11525,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11525,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11516,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11516,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11518,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11518,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11527,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11527,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11529,28): error TS1005: ';' expected.
@@ -100,10 +96,10 @@ typescript_standalone.d.ts(11549,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11549,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11551,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11551,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11561,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11561,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11563,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11563,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11553,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11553,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11555,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11555,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11565,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11565,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11567,28): error TS1005: ';' expected.
@@ -115,17 +111,23 @@ typescript_standalone.d.ts(11571,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11573,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11573,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11575,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11575,72): error TS1005: ';' expected.
+typescript_standalone.d.ts(11575,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11577,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11577,52): error TS1005: ';' expected.
-typescript_standalone.d.ts(11649,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11649,72): error TS1005: ';' expected.
-typescript_standalone.d.ts(11651,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11651,38): error TS1005: ';' expected.
+typescript_standalone.d.ts(11577,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11579,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11579,72): error TS1005: ';' expected.
+typescript_standalone.d.ts(11581,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11581,52): error TS1005: ';' expected.
 typescript_standalone.d.ts(11653,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11653,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11729,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11729,48): error TS1005: ';' expected.
+typescript_standalone.d.ts(11653,72): error TS1005: ';' expected.
+typescript_standalone.d.ts(11655,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11655,38): error TS1005: ';' expected.
+typescript_standalone.d.ts(11657,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11657,71): error TS1005: ';' expected.
+typescript_standalone.d.ts(11659,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11659,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11735,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11735,48): error TS1005: ';' expected.
 
 
 ==== tests/cases/compiler/APISample_jsdoc.ts (0 errors) ====
diff --git a/tests/baselines/reference/APISample_linter.errors.txt b/tests/baselines/reference/APISample_linter.errors.txt
index 39c6b1d0d8f..01bab05567a 100644
--- a/tests/baselines/reference/APISample_linter.errors.txt
+++ b/tests/baselines/reference/APISample_linter.errors.txt
@@ -1,79 +1,75 @@
 typescript_standalone.d.ts(21,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(21,41): error TS1005: ';' expected.
-typescript_standalone.d.ts(8907,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(8907,42): error TS1005: ';' expected.
-typescript_standalone.d.ts(9167,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(9167,46): error TS1005: ';' expected.
-typescript_standalone.d.ts(9517,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(9517,36): error TS1005: ';' expected.
-typescript_standalone.d.ts(9541,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(9541,36): error TS1005: ';' expected.
-typescript_standalone.d.ts(9628,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(9628,38): error TS1005: ';' expected.
-typescript_standalone.d.ts(10792,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10792,57): error TS1005: ';' expected.
-typescript_standalone.d.ts(10803,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10803,41): error TS1005: ';' expected.
-typescript_standalone.d.ts(10813,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10813,48): error TS1005: ';' expected.
-typescript_standalone.d.ts(10888,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10888,47): error TS1005: ';' expected.
-typescript_standalone.d.ts(10945,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10945,47): error TS1005: ';' expected.
-typescript_standalone.d.ts(10999,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10999,52): error TS1005: ';' expected.
-typescript_standalone.d.ts(11019,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11019,44): error TS1005: ';' expected.
-typescript_standalone.d.ts(11029,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11029,35): error TS1005: ';' expected.
-typescript_standalone.d.ts(11063,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11063,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11066,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11066,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(8910,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(8910,42): error TS1005: ';' expected.
+typescript_standalone.d.ts(9170,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9170,46): error TS1005: ';' expected.
+typescript_standalone.d.ts(9520,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9520,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(9544,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9544,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(9631,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9631,38): error TS1005: ';' expected.
+typescript_standalone.d.ts(10796,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10796,57): error TS1005: ';' expected.
+typescript_standalone.d.ts(10807,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10807,41): error TS1005: ';' expected.
+typescript_standalone.d.ts(10817,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10817,48): error TS1005: ';' expected.
+typescript_standalone.d.ts(10892,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10892,47): error TS1005: ';' expected.
+typescript_standalone.d.ts(10949,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10949,47): error TS1005: ';' expected.
+typescript_standalone.d.ts(11003,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11003,52): error TS1005: ';' expected.
+typescript_standalone.d.ts(11023,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11023,44): error TS1005: ';' expected.
+typescript_standalone.d.ts(11033,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11033,35): error TS1005: ';' expected.
+typescript_standalone.d.ts(11067,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11067,40): error TS1005: ';' expected.
 typescript_standalone.d.ts(11070,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11070,45): error TS1005: ';' expected.
-typescript_standalone.d.ts(11088,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11088,56): error TS1005: ';' expected.
-typescript_standalone.d.ts(11114,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11114,36): error TS1005: ';' expected.
-typescript_standalone.d.ts(11117,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11117,43): error TS1005: ';' expected.
-typescript_standalone.d.ts(11129,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11129,43): error TS1005: ';' expected.
-typescript_standalone.d.ts(11159,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11159,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11193,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11193,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11204,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11204,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11228,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11228,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11236,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11236,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11070,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11074,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11074,45): error TS1005: ';' expected.
+typescript_standalone.d.ts(11092,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11092,56): error TS1005: ';' expected.
+typescript_standalone.d.ts(11118,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11118,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(11121,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11121,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11133,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11133,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11163,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11163,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11197,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11197,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11208,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11208,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11232,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11232,40): error TS1005: ';' expected.
 typescript_standalone.d.ts(11240,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11240,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11270,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11270,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11313,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11313,41): error TS1005: ';' expected.
-typescript_standalone.d.ts(11500,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11500,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11502,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11502,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11244,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11244,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11274,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11274,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11317,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11317,41): error TS1005: ';' expected.
+typescript_standalone.d.ts(11504,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11504,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11506,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11506,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11508,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11508,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11510,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11510,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11512,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11512,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11514,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11514,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11523,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11523,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11525,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11525,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11516,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11516,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11518,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11518,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11527,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11527,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11529,28): error TS1005: ';' expected.
@@ -100,10 +96,10 @@ typescript_standalone.d.ts(11549,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11549,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11551,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11551,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11561,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11561,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11563,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11563,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11553,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11553,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11555,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11555,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11565,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11565,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11567,28): error TS1005: ';' expected.
@@ -115,17 +111,23 @@ typescript_standalone.d.ts(11571,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11573,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11573,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11575,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11575,72): error TS1005: ';' expected.
+typescript_standalone.d.ts(11575,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11577,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11577,52): error TS1005: ';' expected.
-typescript_standalone.d.ts(11649,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11649,72): error TS1005: ';' expected.
-typescript_standalone.d.ts(11651,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11651,38): error TS1005: ';' expected.
+typescript_standalone.d.ts(11577,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11579,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11579,72): error TS1005: ';' expected.
+typescript_standalone.d.ts(11581,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11581,52): error TS1005: ';' expected.
 typescript_standalone.d.ts(11653,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11653,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11729,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11729,48): error TS1005: ';' expected.
+typescript_standalone.d.ts(11653,72): error TS1005: ';' expected.
+typescript_standalone.d.ts(11655,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11655,38): error TS1005: ';' expected.
+typescript_standalone.d.ts(11657,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11657,71): error TS1005: ';' expected.
+typescript_standalone.d.ts(11659,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11659,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11735,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11735,48): error TS1005: ';' expected.
 
 
 ==== tests/cases/compiler/APISample_linter.ts (0 errors) ====
diff --git a/tests/baselines/reference/APISample_parseConfig.errors.txt b/tests/baselines/reference/APISample_parseConfig.errors.txt
index 2cbbf3377f1..87f24152210 100644
--- a/tests/baselines/reference/APISample_parseConfig.errors.txt
+++ b/tests/baselines/reference/APISample_parseConfig.errors.txt
@@ -1,79 +1,75 @@
 typescript_standalone.d.ts(21,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(21,41): error TS1005: ';' expected.
-typescript_standalone.d.ts(8907,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(8907,42): error TS1005: ';' expected.
-typescript_standalone.d.ts(9167,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(9167,46): error TS1005: ';' expected.
-typescript_standalone.d.ts(9517,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(9517,36): error TS1005: ';' expected.
-typescript_standalone.d.ts(9541,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(9541,36): error TS1005: ';' expected.
-typescript_standalone.d.ts(9628,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(9628,38): error TS1005: ';' expected.
-typescript_standalone.d.ts(10792,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10792,57): error TS1005: ';' expected.
-typescript_standalone.d.ts(10803,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10803,41): error TS1005: ';' expected.
-typescript_standalone.d.ts(10813,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10813,48): error TS1005: ';' expected.
-typescript_standalone.d.ts(10888,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10888,47): error TS1005: ';' expected.
-typescript_standalone.d.ts(10945,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10945,47): error TS1005: ';' expected.
-typescript_standalone.d.ts(10999,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10999,52): error TS1005: ';' expected.
-typescript_standalone.d.ts(11019,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11019,44): error TS1005: ';' expected.
-typescript_standalone.d.ts(11029,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11029,35): error TS1005: ';' expected.
-typescript_standalone.d.ts(11063,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11063,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11066,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11066,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(8910,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(8910,42): error TS1005: ';' expected.
+typescript_standalone.d.ts(9170,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9170,46): error TS1005: ';' expected.
+typescript_standalone.d.ts(9520,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9520,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(9544,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9544,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(9631,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9631,38): error TS1005: ';' expected.
+typescript_standalone.d.ts(10796,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10796,57): error TS1005: ';' expected.
+typescript_standalone.d.ts(10807,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10807,41): error TS1005: ';' expected.
+typescript_standalone.d.ts(10817,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10817,48): error TS1005: ';' expected.
+typescript_standalone.d.ts(10892,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10892,47): error TS1005: ';' expected.
+typescript_standalone.d.ts(10949,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10949,47): error TS1005: ';' expected.
+typescript_standalone.d.ts(11003,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11003,52): error TS1005: ';' expected.
+typescript_standalone.d.ts(11023,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11023,44): error TS1005: ';' expected.
+typescript_standalone.d.ts(11033,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11033,35): error TS1005: ';' expected.
+typescript_standalone.d.ts(11067,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11067,40): error TS1005: ';' expected.
 typescript_standalone.d.ts(11070,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11070,45): error TS1005: ';' expected.
-typescript_standalone.d.ts(11088,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11088,56): error TS1005: ';' expected.
-typescript_standalone.d.ts(11114,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11114,36): error TS1005: ';' expected.
-typescript_standalone.d.ts(11117,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11117,43): error TS1005: ';' expected.
-typescript_standalone.d.ts(11129,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11129,43): error TS1005: ';' expected.
-typescript_standalone.d.ts(11159,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11159,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11193,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11193,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11204,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11204,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11228,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11228,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11236,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11236,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11070,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11074,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11074,45): error TS1005: ';' expected.
+typescript_standalone.d.ts(11092,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11092,56): error TS1005: ';' expected.
+typescript_standalone.d.ts(11118,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11118,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(11121,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11121,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11133,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11133,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11163,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11163,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11197,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11197,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11208,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11208,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11232,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11232,40): error TS1005: ';' expected.
 typescript_standalone.d.ts(11240,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11240,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11270,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11270,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11313,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11313,41): error TS1005: ';' expected.
-typescript_standalone.d.ts(11500,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11500,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11502,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11502,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11244,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11244,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11274,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11274,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11317,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11317,41): error TS1005: ';' expected.
+typescript_standalone.d.ts(11504,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11504,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11506,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11506,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11508,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11508,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11510,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11510,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11512,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11512,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11514,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11514,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11523,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11523,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11525,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11525,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11516,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11516,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11518,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11518,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11527,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11527,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11529,28): error TS1005: ';' expected.
@@ -100,10 +96,10 @@ typescript_standalone.d.ts(11549,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11549,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11551,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11551,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11561,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11561,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11563,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11563,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11553,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11553,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11555,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11555,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11565,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11565,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11567,28): error TS1005: ';' expected.
@@ -115,17 +111,23 @@ typescript_standalone.d.ts(11571,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11573,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11573,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11575,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11575,72): error TS1005: ';' expected.
+typescript_standalone.d.ts(11575,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11577,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11577,52): error TS1005: ';' expected.
-typescript_standalone.d.ts(11649,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11649,72): error TS1005: ';' expected.
-typescript_standalone.d.ts(11651,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11651,38): error TS1005: ';' expected.
+typescript_standalone.d.ts(11577,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11579,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11579,72): error TS1005: ';' expected.
+typescript_standalone.d.ts(11581,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11581,52): error TS1005: ';' expected.
 typescript_standalone.d.ts(11653,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11653,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11729,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11729,48): error TS1005: ';' expected.
+typescript_standalone.d.ts(11653,72): error TS1005: ';' expected.
+typescript_standalone.d.ts(11655,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11655,38): error TS1005: ';' expected.
+typescript_standalone.d.ts(11657,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11657,71): error TS1005: ';' expected.
+typescript_standalone.d.ts(11659,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11659,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11735,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11735,48): error TS1005: ';' expected.
 
 
 ==== tests/cases/compiler/APISample_parseConfig.ts (0 errors) ====
diff --git a/tests/baselines/reference/APISample_transform.errors.txt b/tests/baselines/reference/APISample_transform.errors.txt
index 477fd00d731..3f8facbb071 100644
--- a/tests/baselines/reference/APISample_transform.errors.txt
+++ b/tests/baselines/reference/APISample_transform.errors.txt
@@ -1,79 +1,75 @@
 typescript_standalone.d.ts(21,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(21,41): error TS1005: ';' expected.
-typescript_standalone.d.ts(8907,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(8907,42): error TS1005: ';' expected.
-typescript_standalone.d.ts(9167,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(9167,46): error TS1005: ';' expected.
-typescript_standalone.d.ts(9517,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(9517,36): error TS1005: ';' expected.
-typescript_standalone.d.ts(9541,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(9541,36): error TS1005: ';' expected.
-typescript_standalone.d.ts(9628,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(9628,38): error TS1005: ';' expected.
-typescript_standalone.d.ts(10792,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10792,57): error TS1005: ';' expected.
-typescript_standalone.d.ts(10803,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10803,41): error TS1005: ';' expected.
-typescript_standalone.d.ts(10813,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10813,48): error TS1005: ';' expected.
-typescript_standalone.d.ts(10888,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10888,47): error TS1005: ';' expected.
-typescript_standalone.d.ts(10945,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10945,47): error TS1005: ';' expected.
-typescript_standalone.d.ts(10999,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10999,52): error TS1005: ';' expected.
-typescript_standalone.d.ts(11019,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11019,44): error TS1005: ';' expected.
-typescript_standalone.d.ts(11029,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11029,35): error TS1005: ';' expected.
-typescript_standalone.d.ts(11063,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11063,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11066,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11066,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(8910,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(8910,42): error TS1005: ';' expected.
+typescript_standalone.d.ts(9170,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9170,46): error TS1005: ';' expected.
+typescript_standalone.d.ts(9520,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9520,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(9544,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9544,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(9631,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9631,38): error TS1005: ';' expected.
+typescript_standalone.d.ts(10796,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10796,57): error TS1005: ';' expected.
+typescript_standalone.d.ts(10807,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10807,41): error TS1005: ';' expected.
+typescript_standalone.d.ts(10817,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10817,48): error TS1005: ';' expected.
+typescript_standalone.d.ts(10892,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10892,47): error TS1005: ';' expected.
+typescript_standalone.d.ts(10949,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10949,47): error TS1005: ';' expected.
+typescript_standalone.d.ts(11003,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11003,52): error TS1005: ';' expected.
+typescript_standalone.d.ts(11023,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11023,44): error TS1005: ';' expected.
+typescript_standalone.d.ts(11033,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11033,35): error TS1005: ';' expected.
+typescript_standalone.d.ts(11067,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11067,40): error TS1005: ';' expected.
 typescript_standalone.d.ts(11070,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11070,45): error TS1005: ';' expected.
-typescript_standalone.d.ts(11088,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11088,56): error TS1005: ';' expected.
-typescript_standalone.d.ts(11114,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11114,36): error TS1005: ';' expected.
-typescript_standalone.d.ts(11117,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11117,43): error TS1005: ';' expected.
-typescript_standalone.d.ts(11129,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11129,43): error TS1005: ';' expected.
-typescript_standalone.d.ts(11159,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11159,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11193,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11193,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11204,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11204,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11228,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11228,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11236,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11236,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11070,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11074,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11074,45): error TS1005: ';' expected.
+typescript_standalone.d.ts(11092,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11092,56): error TS1005: ';' expected.
+typescript_standalone.d.ts(11118,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11118,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(11121,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11121,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11133,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11133,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11163,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11163,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11197,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11197,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11208,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11208,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11232,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11232,40): error TS1005: ';' expected.
 typescript_standalone.d.ts(11240,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11240,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11270,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11270,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11313,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11313,41): error TS1005: ';' expected.
-typescript_standalone.d.ts(11500,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11500,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11502,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11502,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11244,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11244,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11274,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11274,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11317,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11317,41): error TS1005: ';' expected.
+typescript_standalone.d.ts(11504,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11504,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11506,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11506,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11508,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11508,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11510,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11510,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11512,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11512,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11514,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11514,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11523,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11523,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11525,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11525,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11516,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11516,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11518,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11518,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11527,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11527,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11529,28): error TS1005: ';' expected.
@@ -100,10 +96,10 @@ typescript_standalone.d.ts(11549,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11549,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11551,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11551,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11561,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11561,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11563,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11563,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11553,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11553,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11555,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11555,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11565,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11565,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11567,28): error TS1005: ';' expected.
@@ -115,17 +111,23 @@ typescript_standalone.d.ts(11571,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11573,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11573,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11575,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11575,72): error TS1005: ';' expected.
+typescript_standalone.d.ts(11575,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11577,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11577,52): error TS1005: ';' expected.
-typescript_standalone.d.ts(11649,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11649,72): error TS1005: ';' expected.
-typescript_standalone.d.ts(11651,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11651,38): error TS1005: ';' expected.
+typescript_standalone.d.ts(11577,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11579,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11579,72): error TS1005: ';' expected.
+typescript_standalone.d.ts(11581,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11581,52): error TS1005: ';' expected.
 typescript_standalone.d.ts(11653,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11653,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11729,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11729,48): error TS1005: ';' expected.
+typescript_standalone.d.ts(11653,72): error TS1005: ';' expected.
+typescript_standalone.d.ts(11655,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11655,38): error TS1005: ';' expected.
+typescript_standalone.d.ts(11657,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11657,71): error TS1005: ';' expected.
+typescript_standalone.d.ts(11659,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11659,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11735,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11735,48): error TS1005: ';' expected.
 
 
 ==== tests/cases/compiler/APISample_transform.ts (0 errors) ====
diff --git a/tests/baselines/reference/APISample_watcher.errors.txt b/tests/baselines/reference/APISample_watcher.errors.txt
index 6f9d853dde7..61fffd2cec8 100644
--- a/tests/baselines/reference/APISample_watcher.errors.txt
+++ b/tests/baselines/reference/APISample_watcher.errors.txt
@@ -1,79 +1,75 @@
 typescript_standalone.d.ts(21,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(21,41): error TS1005: ';' expected.
-typescript_standalone.d.ts(8907,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(8907,42): error TS1005: ';' expected.
-typescript_standalone.d.ts(9167,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(9167,46): error TS1005: ';' expected.
-typescript_standalone.d.ts(9517,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(9517,36): error TS1005: ';' expected.
-typescript_standalone.d.ts(9541,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(9541,36): error TS1005: ';' expected.
-typescript_standalone.d.ts(9628,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(9628,38): error TS1005: ';' expected.
-typescript_standalone.d.ts(10792,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10792,57): error TS1005: ';' expected.
-typescript_standalone.d.ts(10803,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10803,41): error TS1005: ';' expected.
-typescript_standalone.d.ts(10813,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10813,48): error TS1005: ';' expected.
-typescript_standalone.d.ts(10888,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10888,47): error TS1005: ';' expected.
-typescript_standalone.d.ts(10945,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10945,47): error TS1005: ';' expected.
-typescript_standalone.d.ts(10999,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(10999,52): error TS1005: ';' expected.
-typescript_standalone.d.ts(11019,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11019,44): error TS1005: ';' expected.
-typescript_standalone.d.ts(11029,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11029,35): error TS1005: ';' expected.
-typescript_standalone.d.ts(11063,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11063,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11066,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11066,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(8910,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(8910,42): error TS1005: ';' expected.
+typescript_standalone.d.ts(9170,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9170,46): error TS1005: ';' expected.
+typescript_standalone.d.ts(9520,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9520,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(9544,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9544,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(9631,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(9631,38): error TS1005: ';' expected.
+typescript_standalone.d.ts(10796,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10796,57): error TS1005: ';' expected.
+typescript_standalone.d.ts(10807,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10807,41): error TS1005: ';' expected.
+typescript_standalone.d.ts(10817,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10817,48): error TS1005: ';' expected.
+typescript_standalone.d.ts(10892,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10892,47): error TS1005: ';' expected.
+typescript_standalone.d.ts(10949,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(10949,47): error TS1005: ';' expected.
+typescript_standalone.d.ts(11003,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11003,52): error TS1005: ';' expected.
+typescript_standalone.d.ts(11023,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11023,44): error TS1005: ';' expected.
+typescript_standalone.d.ts(11033,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11033,35): error TS1005: ';' expected.
+typescript_standalone.d.ts(11067,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11067,40): error TS1005: ';' expected.
 typescript_standalone.d.ts(11070,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11070,45): error TS1005: ';' expected.
-typescript_standalone.d.ts(11088,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11088,56): error TS1005: ';' expected.
-typescript_standalone.d.ts(11114,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11114,36): error TS1005: ';' expected.
-typescript_standalone.d.ts(11117,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11117,43): error TS1005: ';' expected.
-typescript_standalone.d.ts(11129,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11129,43): error TS1005: ';' expected.
-typescript_standalone.d.ts(11159,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11159,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11193,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11193,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11204,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11204,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11228,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11228,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11236,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11236,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11070,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11074,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11074,45): error TS1005: ';' expected.
+typescript_standalone.d.ts(11092,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11092,56): error TS1005: ';' expected.
+typescript_standalone.d.ts(11118,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11118,36): error TS1005: ';' expected.
+typescript_standalone.d.ts(11121,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11121,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11133,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11133,43): error TS1005: ';' expected.
+typescript_standalone.d.ts(11163,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11163,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11197,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11197,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11208,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11208,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11232,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11232,40): error TS1005: ';' expected.
 typescript_standalone.d.ts(11240,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11240,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11270,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11270,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11313,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11313,41): error TS1005: ';' expected.
-typescript_standalone.d.ts(11500,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11500,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11502,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11502,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11244,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11244,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11274,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11274,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11317,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11317,41): error TS1005: ';' expected.
+typescript_standalone.d.ts(11504,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11504,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11506,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11506,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11508,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11508,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11510,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11510,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11512,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11512,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11514,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11514,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11523,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11523,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11525,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11525,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11516,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11516,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11518,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11518,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11527,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11527,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11529,28): error TS1005: ';' expected.
@@ -100,10 +96,10 @@ typescript_standalone.d.ts(11549,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11549,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11551,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11551,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11561,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11561,37): error TS1005: ';' expected.
-typescript_standalone.d.ts(11563,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11563,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11553,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11553,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11555,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11555,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11565,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11565,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11567,28): error TS1005: ';' expected.
@@ -115,17 +111,23 @@ typescript_standalone.d.ts(11571,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11573,28): error TS1005: ';' expected.
 typescript_standalone.d.ts(11573,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11575,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11575,72): error TS1005: ';' expected.
+typescript_standalone.d.ts(11575,37): error TS1005: ';' expected.
 typescript_standalone.d.ts(11577,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11577,52): error TS1005: ';' expected.
-typescript_standalone.d.ts(11649,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11649,72): error TS1005: ';' expected.
-typescript_standalone.d.ts(11651,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11651,38): error TS1005: ';' expected.
+typescript_standalone.d.ts(11577,37): error TS1005: ';' expected.
+typescript_standalone.d.ts(11579,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11579,72): error TS1005: ';' expected.
+typescript_standalone.d.ts(11581,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11581,52): error TS1005: ';' expected.
 typescript_standalone.d.ts(11653,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11653,40): error TS1005: ';' expected.
-typescript_standalone.d.ts(11729,28): error TS1005: ';' expected.
-typescript_standalone.d.ts(11729,48): error TS1005: ';' expected.
+typescript_standalone.d.ts(11653,72): error TS1005: ';' expected.
+typescript_standalone.d.ts(11655,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11655,38): error TS1005: ';' expected.
+typescript_standalone.d.ts(11657,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11657,71): error TS1005: ';' expected.
+typescript_standalone.d.ts(11659,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11659,40): error TS1005: ';' expected.
+typescript_standalone.d.ts(11735,28): error TS1005: ';' expected.
+typescript_standalone.d.ts(11735,48): error TS1005: ';' expected.
 
 
 ==== tests/cases/compiler/APISample_watcher.ts (0 errors) ====
diff --git a/tests/baselines/reference/api/tsserverlibrary.d.ts b/tests/baselines/reference/api/tsserverlibrary.d.ts
index fdf8974ec43..6083be771c7 100644
--- a/tests/baselines/reference/api/tsserverlibrary.d.ts
+++ b/tests/baselines/reference/api/tsserverlibrary.d.ts
@@ -5896,6 +5896,9 @@ declare namespace ts {
         Convert_0_to_mapped_object_type: DiagnosticMessage;
         Convert_namespace_import_to_named_imports: DiagnosticMessage;
         Convert_named_imports_to_namespace_import: DiagnosticMessage;
+        Add_or_remove_braces_in_an_arrow_function: DiagnosticMessage;
+        Add_braces_to_arrow_function: DiagnosticMessage;
+        Remove_braces_from_arrow_function: DiagnosticMessage;
     };
 }
 declare namespace ts {
@@ -10601,6 +10604,7 @@ declare namespace ts {
      * user was before extracting it.
      */
     function getRenameLocation(edits: ReadonlyArray<FileTextChanges>, renameFilename: string, name: string, preferLastLocation: boolean): number;
+    function copyComments(sourceNode: Node, targetNode: Node, sourceFile: SourceFile, commentKind?: CommentKind, hasTrailingNewLine?: boolean): void;
 }
 declare namespace ts {
     function createClassifier(): Classifier;
@@ -11470,6 +11474,8 @@ declare namespace ts.refactor.generateGetAccessorAndSetAccessor {
 }
 declare namespace ts.refactor {
 }
+declare namespace ts.refactor.addOrRemoveBracesToArrowFunction {
+}
 declare namespace ts.sourcemaps {
     interface SourceMapData {
         version?: number;
diff --git a/tests/baselines/reference/api/typescript.d.ts b/tests/baselines/reference/api/typescript.d.ts
index 2c2b7b0deda..71ae8a35888 100644
--- a/tests/baselines/reference/api/typescript.d.ts
+++ b/tests/baselines/reference/api/typescript.d.ts
@@ -5896,6 +5896,9 @@ declare namespace ts {
         Convert_0_to_mapped_object_type: DiagnosticMessage;
         Convert_namespace_import_to_named_imports: DiagnosticMessage;
         Convert_named_imports_to_namespace_import: DiagnosticMessage;
+        Add_or_remove_braces_in_an_arrow_function: DiagnosticMessage;
+        Add_braces_to_arrow_function: DiagnosticMessage;
+        Remove_braces_from_arrow_function: DiagnosticMessage;
     };
 }
 declare namespace ts {
@@ -10781,6 +10784,7 @@ declare namespace ts {
      * user was before extracting it.
      */
     function getRenameLocation(edits: ReadonlyArray<FileTextChanges>, renameFilename: string, name: string, preferLastLocation: boolean): number;
+    function copyComments(sourceNode: Node, targetNode: Node, sourceFile: SourceFile, commentKind?: CommentKind, hasTrailingNewLine?: boolean): void;
 }
 declare namespace ts {
     function createClassifier(): Classifier;
@@ -11650,6 +11654,8 @@ declare namespace ts.refactor.generateGetAccessorAndSetAccessor {
 }
 declare namespace ts.refactor {
 }
+declare namespace ts.refactor.addOrRemoveBracesToArrowFunction {
+}
 declare namespace ts.sourcemaps {
     interface SourceMapData {
         version?: number;

From 923a8aab0ed74f4743a0a2f2e8068144c62f31d5 Mon Sep 17 00:00:00 2001
From: Nathan Shively-Sanders <293473+sandersn@users.noreply.github.com>
Date: Mon, 11 Jun 2018 14:45:27 -0700
Subject: [PATCH 36/37] Add Variable to HasExports (#24871)

JS containers are variables, but may have exports just like classes and
modules.
---
 src/compiler/types.ts                         |  2 +-
 .../reference/api/tsserverlibrary.d.ts        |  2 +-
 tests/baselines/reference/api/typescript.d.ts |  2 +-
 .../reference/moduleExportAlias5.symbols      | 21 ++++++++++++++
 .../reference/moduleExportAlias5.types        | 29 +++++++++++++++++++
 .../conformance/salsa/moduleExportAlias5.ts   | 11 +++++++
 6 files changed, 64 insertions(+), 3 deletions(-)
 create mode 100644 tests/baselines/reference/moduleExportAlias5.symbols
 create mode 100644 tests/baselines/reference/moduleExportAlias5.types
 create mode 100644 tests/cases/conformance/salsa/moduleExportAlias5.ts

diff --git a/src/compiler/types.ts b/src/compiler/types.ts
index 1378be2a724..ae21fdba02a 100644
--- a/src/compiler/types.ts
+++ b/src/compiler/types.ts
@@ -3467,7 +3467,7 @@ namespace ts {
 
         ExportHasLocal = Function | Class | Enum | ValueModule,
 
-        HasExports = Class | Enum | Module,
+        HasExports = Class | Enum | Module | Variable,
         HasMembers = Class | Interface | TypeLiteral | ObjectLiteral,
 
         BlockScoped = BlockScopedVariable | Class | Enum,
diff --git a/tests/baselines/reference/api/tsserverlibrary.d.ts b/tests/baselines/reference/api/tsserverlibrary.d.ts
index 2cfb99444e5..202394bd5ce 100644
--- a/tests/baselines/reference/api/tsserverlibrary.d.ts
+++ b/tests/baselines/reference/api/tsserverlibrary.d.ts
@@ -2071,7 +2071,7 @@ declare namespace ts {
         AliasExcludes = 2097152,
         ModuleMember = 2623475,
         ExportHasLocal = 944,
-        HasExports = 1952,
+        HasExports = 1955,
         HasMembers = 6240,
         BlockScoped = 418,
         PropertyOrAccessor = 98308,
diff --git a/tests/baselines/reference/api/typescript.d.ts b/tests/baselines/reference/api/typescript.d.ts
index acbcabf5bef..5bc91053148 100644
--- a/tests/baselines/reference/api/typescript.d.ts
+++ b/tests/baselines/reference/api/typescript.d.ts
@@ -2071,7 +2071,7 @@ declare namespace ts {
         AliasExcludes = 2097152,
         ModuleMember = 2623475,
         ExportHasLocal = 944,
-        HasExports = 1952,
+        HasExports = 1955,
         HasMembers = 6240,
         BlockScoped = 418,
         PropertyOrAccessor = 98308,
diff --git a/tests/baselines/reference/moduleExportAlias5.symbols b/tests/baselines/reference/moduleExportAlias5.symbols
new file mode 100644
index 00000000000..f856e9ae32c
--- /dev/null
+++ b/tests/baselines/reference/moduleExportAlias5.symbols
@@ -0,0 +1,21 @@
+=== tests/cases/conformance/salsa/bug24754.js ===
+// #24754
+const webpack = function (){
+>webpack : Symbol(webpack, Decl(bug24754.js, 1, 5))
+}
+exports = module.exports = webpack;
+>exports : Symbol("tests/cases/conformance/salsa/bug24754", Decl(bug24754.js, 0, 0))
+>module : Symbol(export=, Decl(bug24754.js, 3, 9))
+>exports : Symbol(export=, Decl(bug24754.js, 3, 9))
+>webpack : Symbol(webpack, Decl(bug24754.js, 1, 5))
+
+exports.version = 1001;
+>exports.version : Symbol(version, Decl(bug24754.js, 3, 35))
+>exports : Symbol(version, Decl(bug24754.js, 3, 35))
+>version : Symbol(version, Decl(bug24754.js, 3, 35))
+
+webpack.WebpackOptionsDefaulter = 1111;
+>webpack.WebpackOptionsDefaulter : Symbol(webpack.WebpackOptionsDefaulter, Decl(bug24754.js, 4, 23))
+>webpack : Symbol(webpack, Decl(bug24754.js, 1, 5))
+>WebpackOptionsDefaulter : Symbol(webpack.WebpackOptionsDefaulter, Decl(bug24754.js, 4, 23))
+
diff --git a/tests/baselines/reference/moduleExportAlias5.types b/tests/baselines/reference/moduleExportAlias5.types
new file mode 100644
index 00000000000..47a5cb3ddfa
--- /dev/null
+++ b/tests/baselines/reference/moduleExportAlias5.types
@@ -0,0 +1,29 @@
+=== tests/cases/conformance/salsa/bug24754.js ===
+// #24754
+const webpack = function (){
+>webpack : { (): void; WebpackOptionsDefaulter: number; }
+>function (){} : { (): void; WebpackOptionsDefaulter: number; }
+}
+exports = module.exports = webpack;
+>exports = module.exports = webpack : { (): void; WebpackOptionsDefaulter: number; }
+>exports : typeof import("tests/cases/conformance/salsa/bug24754")
+>module.exports = webpack : { (): void; WebpackOptionsDefaulter: number; }
+>module.exports : any
+>module : any
+>exports : any
+>webpack : { (): void; WebpackOptionsDefaulter: number; }
+
+exports.version = 1001;
+>exports.version = 1001 : 1001
+>exports.version : number
+>exports : typeof import("tests/cases/conformance/salsa/bug24754")
+>version : number
+>1001 : 1001
+
+webpack.WebpackOptionsDefaulter = 1111;
+>webpack.WebpackOptionsDefaulter = 1111 : 1111
+>webpack.WebpackOptionsDefaulter : number
+>webpack : { (): void; WebpackOptionsDefaulter: number; }
+>WebpackOptionsDefaulter : number
+>1111 : 1111
+
diff --git a/tests/cases/conformance/salsa/moduleExportAlias5.ts b/tests/cases/conformance/salsa/moduleExportAlias5.ts
new file mode 100644
index 00000000000..3bba9813970
--- /dev/null
+++ b/tests/cases/conformance/salsa/moduleExportAlias5.ts
@@ -0,0 +1,11 @@
+// @checkJs: true
+// @allowJS: true
+// @noEmit: true
+// @Filename: bug24754.js
+// #24754
+const webpack = function (){
+}
+exports = module.exports = webpack;
+exports.version = 1001;
+
+webpack.WebpackOptionsDefaulter = 1111;

From 9e48b9fe7ecf17add0fe86563f88a61da3a49640 Mon Sep 17 00:00:00 2001
From: csigs <csigs@outlook.com>
Date: Mon, 11 Jun 2018 22:10:43 +0000
Subject: [PATCH 37/37] LEGO: check in for master to temporary branch.

---
 .../diagnosticMessages.generated.json.lcl     | 135 ++++++++++++++++++
 1 file changed, 135 insertions(+)

diff --git a/src/loc/lcl/ptb/diagnosticMessages/diagnosticMessages.generated.json.lcl b/src/loc/lcl/ptb/diagnosticMessages/diagnosticMessages.generated.json.lcl
index bdabbd3cf7d..5888ca24a9c 100644
--- a/src/loc/lcl/ptb/diagnosticMessages/diagnosticMessages.generated.json.lcl
+++ b/src/loc/lcl/ptb/diagnosticMessages/diagnosticMessages.generated.json.lcl
@@ -476,6 +476,18 @@
         </Str>
         <Disp Icon="Str" />
       </Item>
+      <Item ItemId=";A_non_dry_build_would_build_project_0_6357" ItemType="0" PsrId="306" Leaf="true">
+        <Str Cat="Text">
+          <Val><![CDATA[A non-dry build would build project '{0}']]></Val>
+        </Str>
+        <Disp Icon="Str" />
+      </Item>
+      <Item ItemId=";A_non_dry_build_would_delete_the_following_files_Colon_0_6356" ItemType="0" PsrId="306" Leaf="true">
+        <Str Cat="Text">
+          <Val><![CDATA[A non-dry build would delete the following files: {0}]]></Val>
+        </Str>
+        <Disp Icon="Str" />
+      </Item>
       <Item ItemId=";A_parameter_initializer_is_only_allowed_in_a_function_or_constructor_implementation_2371" ItemType="0" PsrId="306" Leaf="true">
         <Str Cat="Text">
           <Val><![CDATA[A parameter initializer is only allowed in a function or constructor implementation.]]></Val>
@@ -1751,6 +1763,24 @@
         </Str>
         <Disp Icon="Str" />
       </Item>
+      <Item ItemId=";Build_all_projects_including_those_that_appear_to_be_up_to_date_6368" ItemType="0" PsrId="306" Leaf="true">
+        <Str Cat="Text">
+          <Val><![CDATA[Build all projects, including those that appear to be up to date]]></Val>
+        </Str>
+        <Disp Icon="Str" />
+      </Item>
+      <Item ItemId=";Build_one_or_more_projects_and_their_dependencies_if_out_of_date_6364" ItemType="0" PsrId="306" Leaf="true">
+        <Str Cat="Text">
+          <Val><![CDATA[Build one or more projects and their dependencies, if out of date]]></Val>
+        </Str>
+        <Disp Icon="Str" />
+      </Item>
+      <Item ItemId=";Building_project_0_6358" ItemType="0" PsrId="306" Leaf="true">
+        <Str Cat="Text">
+          <Val><![CDATA[Building project '{0}'...]]></Val>
+        </Str>
+        <Disp Icon="Str" />
+      </Item>
       <Item ItemId=";Call_decorator_expression_90028" ItemType="0" PsrId="306" Leaf="true">
         <Str Cat="Text">
           <Val><![CDATA[Call decorator expression]]></Val>
@@ -1931,6 +1961,9 @@
       <Item ItemId=";Cannot_find_lib_definition_for_0_2726" ItemType="0" PsrId="306" Leaf="true">
         <Str Cat="Text">
           <Val><![CDATA[Cannot find lib definition for '{0}'.]]></Val>
+          <Tgt Cat="Text" Stat="Loc" Orig="New">
+            <Val><![CDATA[Não é possível encontrar a definição de lib para '{0}'.]]></Val>
+          </Tgt>
         </Str>
         <Disp Icon="Str" />
       </Item>
@@ -2819,6 +2852,12 @@
         </Str>
         <Disp Icon="Str" />
       </Item>
+      <Item ItemId=";Delete_the_outputs_of_all_projects_6365" ItemType="0" PsrId="306" Leaf="true">
+        <Str Cat="Text">
+          <Val><![CDATA[Delete the outputs of all projects]]></Val>
+        </Str>
+        <Disp Icon="Str" />
+      </Item>
       <Item ItemId=";Deprecated_Use_jsxFactory_instead_Specify_the_object_invoked_for_createElement_when_targeting_react__6084" ItemType="0" PsrId="306" Leaf="true">
         <Str Cat="Text">
           <Val><![CDATA[[Deprecated]5D; Use '--jsxFactory' instead. Specify the object invoked for createElement when targeting 'react' JSX emit]]></Val>
@@ -3275,6 +3314,12 @@
         </Str>
         <Disp Icon="Str" />
       </Item>
+      <Item ItemId=";Enable_verbose_logging_6366" ItemType="0" PsrId="306" Leaf="true">
+        <Str Cat="Text">
+          <Val><![CDATA[Enable verbose logging]]></Val>
+        </Str>
+        <Disp Icon="Str" />
+      </Item>
       <Item ItemId=";Enables_emit_interoperability_between_CommonJS_and_ES_Modules_via_creation_of_namespace_objects_for__7037" ItemType="0" PsrId="306" Leaf="true">
         <Str Cat="Text">
           <Val><![CDATA[Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'.]]></Val>
@@ -5702,6 +5747,12 @@
         </Str>
         <Disp Icon="Str" />
       </Item>
+      <Item ItemId=";Option_build_must_be_the_first_command_line_argument_6369" ItemType="0" PsrId="306" Leaf="true">
+        <Str Cat="Text">
+          <Val><![CDATA[Option '--build' must be the first command line argument.]]></Val>
+        </Str>
+        <Disp Icon="Str" />
+      </Item>
       <Item ItemId=";Option_isolatedModules_can_only_be_used_when_either_option_module_is_provided_or_option_target_is_ES_5047" ItemType="0" PsrId="306" Leaf="true">
         <Str Cat="Text">
           <Val><![CDATA[Option 'isolatedModules' can only be used when either option '--module' is provided or option 'target' is 'ES2015' or higher.]]></Val>
@@ -5738,6 +5789,12 @@
         </Str>
         <Disp Icon="Str" />
       </Item>
+      <Item ItemId=";Options_0_and_1_cannot_be_combined_6370" ItemType="0" PsrId="306" Leaf="true">
+        <Str Cat="Text">
+          <Val><![CDATA[Options '{0}' and '{1}' cannot be combined.]]></Val>
+        </Str>
+        <Disp Icon="Str" />
+      </Item>
       <Item ItemId=";Options_Colon_6027" ItemType="0" PsrId="306" Leaf="true">
         <Str Cat="Text">
           <Val><![CDATA[Options:]]></Val>
@@ -6167,6 +6224,48 @@
         </Str>
         <Disp Icon="Str" />
       </Item>
+      <Item ItemId=";Project_0_can_t_be_built_because_its_dependency_1_has_errors_6363" ItemType="0" PsrId="306" Leaf="true">
+        <Str Cat="Text">
+          <Val><![CDATA[Project '{0}' can't be built because its dependency '{1}' has errors]]></Val>
+        </Str>
+        <Disp Icon="Str" />
+      </Item>
+      <Item ItemId=";Project_0_is_out_of_date_because_its_dependency_1_is_out_of_date_6353" ItemType="0" PsrId="306" Leaf="true">
+        <Str Cat="Text">
+          <Val><![CDATA[Project '{0}' is out of date because its dependency '{1}' is out of date]]></Val>
+        </Str>
+        <Disp Icon="Str" />
+      </Item>
+      <Item ItemId=";Project_0_is_out_of_date_because_oldest_output_1_is_older_than_newest_input_2_6350" ItemType="0" PsrId="306" Leaf="true">
+        <Str Cat="Text">
+          <Val><![CDATA[Project '{0}' is out of date because oldest output '{1}' is older than newest input '{2}']]></Val>
+        </Str>
+        <Disp Icon="Str" />
+      </Item>
+      <Item ItemId=";Project_0_is_out_of_date_because_output_file_1_does_not_exist_6352" ItemType="0" PsrId="306" Leaf="true">
+        <Str Cat="Text">
+          <Val><![CDATA[Project '{0}' is out of date because output file '{1}' does not exist]]></Val>
+        </Str>
+        <Disp Icon="Str" />
+      </Item>
+      <Item ItemId=";Project_0_is_up_to_date_6361" ItemType="0" PsrId="306" Leaf="true">
+        <Str Cat="Text">
+          <Val><![CDATA[Project '{0}' is up to date]]></Val>
+        </Str>
+        <Disp Icon="Str" />
+      </Item>
+      <Item ItemId=";Project_0_is_up_to_date_because_newest_input_1_is_older_than_oldest_output_2_6351" ItemType="0" PsrId="306" Leaf="true">
+        <Str Cat="Text">
+          <Val><![CDATA[Project '{0}' is up to date because newest input '{1}' is older than oldest output '{2}']]></Val>
+        </Str>
+        <Disp Icon="Str" />
+      </Item>
+      <Item ItemId=";Project_0_is_up_to_date_with_d_ts_files_from_its_dependencies_6354" ItemType="0" PsrId="306" Leaf="true">
+        <Str Cat="Text">
+          <Val><![CDATA[Project '{0}' is up to date with .d.ts files from its dependencies]]></Val>
+        </Str>
+        <Disp Icon="Str" />
+      </Item>
       <Item ItemId=";Project_references_may_not_form_a_circular_graph_Cycle_detected_Colon_0_6202" ItemType="0" PsrId="306" Leaf="true">
         <Str Cat="Text">
           <Val><![CDATA[Project references may not form a circular graph. Cycle detected: {0}]]></Val>
@@ -6176,6 +6275,12 @@
         </Str>
         <Disp Icon="Str" />
       </Item>
+      <Item ItemId=";Projects_in_this_build_Colon_0_6355" ItemType="0" PsrId="306" Leaf="true">
+        <Str Cat="Text">
+          <Val><![CDATA[Projects in this build: {0}]]></Val>
+        </Str>
+        <Disp Icon="Str" />
+      </Item>
       <Item ItemId=";Projects_to_reference_6300" ItemType="0" PsrId="306" Leaf="true">
         <Str Cat="Text">
           <Val><![CDATA[Projects to reference]]></Val>
@@ -7211,6 +7316,12 @@
         </Str>
         <Disp Icon="Str" />
       </Item>
+      <Item ItemId=";Show_what_would_be_built_or_deleted_if_specified_with_clean_6367" ItemType="0" PsrId="306" Leaf="true">
+        <Str Cat="Text">
+          <Val><![CDATA[Show what would be built (or deleted, if specified with '--clean')]]></Val>
+        </Str>
+        <Disp Icon="Str" />
+      </Item>
       <Item ItemId=";Signature_0_must_be_a_type_predicate_1224" ItemType="0" PsrId="306" Leaf="true">
         <Str Cat="Text">
           <Val><![CDATA[Signature '{0}' must be a type predicate.]]></Val>
@@ -7229,6 +7340,18 @@
         </Str>
         <Disp Icon="Str" />
       </Item>
+      <Item ItemId=";Skipping_build_of_project_0_because_its_dependency_1_has_errors_6362" ItemType="0" PsrId="306" Leaf="true">
+        <Str Cat="Text">
+          <Val><![CDATA[Skipping build of project '{0}' because its dependency '{1}' has errors]]></Val>
+        </Str>
+        <Disp Icon="Str" />
+      </Item>
+      <Item ItemId=";Skipping_clean_because_not_all_projects_could_be_located_6371" ItemType="0" PsrId="306" Leaf="true">
+        <Str Cat="Text">
+          <Val><![CDATA[Skipping clean because not all projects could be located]]></Val>
+        </Str>
+        <Disp Icon="Str" />
+      </Item>
       <Item ItemId=";Source_Map_Options_6175" ItemType="0" PsrId="306" Leaf="true">
         <Str Cat="Text">
           <Val><![CDATA[Source Map Options]]></Val>
@@ -8837,6 +8960,12 @@
         </Str>
         <Disp Icon="Str" />
       </Item>
+      <Item ItemId=";Updating_output_timestamps_of_project_0_6359" ItemType="0" PsrId="306" Leaf="true">
+        <Str Cat="Text">
+          <Val><![CDATA[Updating output timestamps of project '{0}'...]]></Val>
+        </Str>
+        <Disp Icon="Str" />
+      </Item>
       <Item ItemId=";Use_synthetic_default_member_95016" ItemType="0" PsrId="306" Leaf="true">
         <Str Cat="Text">
           <Val><![CDATA[Use synthetic 'default' member.]]></Val>
@@ -9386,6 +9515,12 @@
         </Str>
         <Disp Icon="Str" />
       </Item>
+      <Item ItemId=";delete_this_Project_0_is_up_to_date_because_it_was_previously_built_6360" ItemType="0" PsrId="306" Leaf="true">
+        <Str Cat="Text">
+          <Val><![CDATA[delete this - Project '{0}' is up to date because it was previously built]]></Val>
+        </Str>
+        <Disp Icon="Str" />
+      </Item>
       <Item ItemId=";enum_declarations_can_only_be_used_in_a_ts_file_8015" ItemType="0" PsrId="306" Leaf="true">
         <Str Cat="Text">
           <Val><![CDATA['enum declarations' can only be used in a .ts file.]]></Val>